* [Qemu-devel] [PATCH v11 01/31] block: Use bdrv_refresh_filename() to pull
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
@ 2018-10-05 23:39 ` Max Reitz
2018-11-15 3:00 ` Eric Blake
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 02/31] block: Use children list in bdrv_refresh_filename Max Reitz
` (29 subsequent siblings)
30 siblings, 1 reply; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:39 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Before this patch, bdrv_refresh_filename() is used in a pushing manner:
Whenever the BDS graph is modified, the parents of the modified edges
are supposed to be updated (recursively upwards). However, that is
nonviable, considering that we want child changes not to concern
parents.
Also, in the long run we want a pull model anyway: Here, we would have a
bdrv_filename() function which returns a BDS's filename, freshly
constructed.
This patch is an intermediate step. It adds bdrv_refresh_filename()
calls before every place a BDS.filename value is used. The only
exceptions are protocol drivers that use their own filename, which
clearly would not profit from refreshing that filename before.
Also, bdrv_get_encrypted_filename() is removed along the way (as a user
of BDS.filename), since it is completely unused.
In turn, all of the calls to bdrv_refresh_filename() before this patch
are removed, because we no longer have to call this function on graph
changes.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
include/block/block.h | 1 -
block.c | 31 +++++++++++++++----------------
block/qapi.c | 4 ++++
block/raw-format.c | 1 +
block/replication.c | 2 --
block/vhdx-log.c | 1 +
block/vmdk.c | 6 ++++++
block/vpc.c | 4 +++-
blockdev.c | 8 ++++++++
9 files changed, 38 insertions(+), 20 deletions(-)
diff --git a/include/block/block.h b/include/block/block.h
index b189cf422e..47a9448d44 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -480,7 +480,6 @@ void bdrv_round_to_clusters(BlockDriverState *bs,
int64_t *cluster_offset,
int64_t *cluster_bytes);
-const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
void bdrv_get_backing_filename(BlockDriverState *bs,
char *filename, int filename_size);
void bdrv_get_full_backing_filename(BlockDriverState *bs,
diff --git a/block.c b/block.c
index 0d6e5f1a76..8a7bc9308a 100644
--- a/block.c
+++ b/block.c
@@ -304,8 +304,11 @@ void bdrv_get_full_backing_filename_from_filename(const char *backed,
void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz,
Error **errp)
{
- char *backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename;
+ char *backed;
+ bdrv_refresh_filename(bs);
+
+ backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename;
bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file,
dest, sz, errp);
}
@@ -984,6 +987,8 @@ static void bdrv_backing_attach(BdrvChild *c)
"node is used as backing hd of '%s'",
bdrv_get_device_or_node_name(parent));
+ bdrv_refresh_filename(backing_hd);
+
parent->open_flags &= ~BDRV_O_NO_BACKING;
pstrcpy(parent->backing_file, sizeof(parent->backing_file),
backing_hd->filename);
@@ -1385,6 +1390,7 @@ static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file,
}
if (file != NULL) {
+ bdrv_refresh_filename(blk_bs(file));
filename = blk_bs(file)->filename;
} else {
/*
@@ -2254,8 +2260,6 @@ void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd,
bdrv_unref(backing_hd);
}
- bdrv_refresh_filename(bs);
-
out:
bdrv_refresh_limits(bs, NULL);
}
@@ -2782,8 +2786,6 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
g_free(child_key_dot);
}
- bdrv_refresh_filename(bs);
-
/* Check if any unknown options were used */
if (qdict_size(options) != 0) {
const QDictEntry *entry = qdict_first(options);
@@ -3234,6 +3236,7 @@ int bdrv_reopen_prepare(BDRVReopenState *reopen_state, BlockReopenQueue *queue,
if (local_err != NULL) {
error_propagate(errp, local_err);
} else {
+ bdrv_refresh_filename(reopen_state->bs);
error_setg(errp, "failed while preparing to reopen image '%s'",
reopen_state->bs->filename);
}
@@ -3806,7 +3809,10 @@ int bdrv_drop_intermediate(BlockDriverState *top, BlockDriverState *base,
/* success - we can delete the intermediate states, and link top->base */
/* TODO Check graph modification op blockers (BLK_PERM_GRAPH_MOD) once
* we've figured out how they should work. */
- backing_file_str = backing_file_str ? backing_file_str : base->filename;
+ if (!backing_file_str) {
+ bdrv_refresh_filename(base);
+ backing_file_str = base->filename;
+ }
QLIST_FOREACH_SAFE(c, &top->parents, next_parent, next) {
/* Check whether we are allowed to switch c from top to base */
@@ -4202,16 +4208,6 @@ bool bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs)
return bs->supported_zero_flags & BDRV_REQ_MAY_UNMAP;
}
-const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
-{
- if (bs->backing && bs->backing->bs->encrypted)
- return bs->backing_file;
- else if (bs->encrypted)
- return bs->filename;
- else
- return NULL;
-}
-
void bdrv_get_backing_filename(BlockDriverState *bs,
char *filename, int filename_size)
{
@@ -4331,6 +4327,9 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
is_protocol = path_has_protocol(backing_file);
+ /* This will recursively refresh everything in the backing chain */
+ bdrv_refresh_filename(bs);
+
for (curr_bs = bs; curr_bs->backing; curr_bs = curr_bs->backing->bs) {
/* If either of the filename paths is actually a protocol, then
diff --git a/block/qapi.c b/block/qapi.c
index c66f949db8..743136b84e 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -51,6 +51,8 @@ BlockDeviceInfo *bdrv_block_device_info(BlockBackend *blk,
return NULL;
}
+ bdrv_refresh_filename(bs);
+
info = g_malloc0(sizeof(*info));
info->file = g_strdup(bs->filename);
info->ro = bs->read_only;
@@ -264,6 +266,8 @@ void bdrv_query_image_info(BlockDriverState *bs,
goto out;
}
+ bdrv_refresh_filename(bs);
+
info = g_new0(ImageInfo, 1);
info->filename = g_strdup(bs->filename);
info->format = g_strdup(bdrv_get_format_name(bs));
diff --git a/block/raw-format.c b/block/raw-format.c
index 6f6dc99b2c..d07bcdae62 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -436,6 +436,7 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
bs->file->bs->supported_zero_flags);
if (bs->probed && !bdrv_is_read_only(bs)) {
+ bdrv_refresh_filename(bs->file->bs);
fprintf(stderr,
"WARNING: Image format was not specified for '%s' and probing "
"guessed raw.\n"
diff --git a/block/replication.c b/block/replication.c
index 6349d6958e..d5e39be5eb 100644
--- a/block/replication.c
+++ b/block/replication.c
@@ -643,8 +643,6 @@ static void replication_done(void *opaque, int ret)
if (ret == 0) {
s->stage = BLOCK_REPLICATION_DONE;
- /* refresh top bs's filename */
- bdrv_refresh_filename(bs);
s->active_disk = NULL;
s->secondary_disk = NULL;
s->hidden_disk = NULL;
diff --git a/block/vhdx-log.c b/block/vhdx-log.c
index d2f1b98199..3f4c11c932 100644
--- a/block/vhdx-log.c
+++ b/block/vhdx-log.c
@@ -803,6 +803,7 @@ int vhdx_parse_log(BlockDriverState *bs, BDRVVHDXState *s, bool *flushed,
if (logs.valid) {
if (bs->read_only) {
+ bdrv_refresh_filename(bs);
ret = -EPERM;
error_setg(errp,
"VHDX image file '%s' opened read-only, but "
diff --git a/block/vmdk.c b/block/vmdk.c
index 2c9e86d98f..bb6033d409 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -479,6 +479,7 @@ static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
extent->l1_table,
l1_size);
if (ret < 0) {
+ bdrv_refresh_filename(extent->file->bs);
error_setg_errno(errp, -ret,
"Could not read l1 table from extent '%s'",
extent->file->bs->filename);
@@ -499,6 +500,7 @@ static int vmdk_init_tables(BlockDriverState *bs, VmdkExtent *extent,
extent->l1_backup_table,
l1_size);
if (ret < 0) {
+ bdrv_refresh_filename(extent->file->bs);
error_setg_errno(errp, -ret,
"Could not read l1 backup table from extent '%s'",
extent->file->bs->filename);
@@ -530,6 +532,7 @@ static int vmdk_open_vmfs_sparse(BlockDriverState *bs,
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
if (ret < 0) {
+ bdrv_refresh_filename(file->bs);
error_setg_errno(errp, -ret,
"Could not read header from file '%s'",
file->bs->filename);
@@ -607,6 +610,7 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
ret = bdrv_pread(file, sizeof(magic), &header, sizeof(header));
if (ret < 0) {
+ bdrv_refresh_filename(file->bs);
error_setg_errno(errp, -ret,
"Could not read header from file '%s'",
file->bs->filename);
@@ -861,6 +865,7 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
if (!path_is_absolute(fname) && !path_has_protocol(fname) &&
!desc_file_path[0])
{
+ bdrv_refresh_filename(bs->file->bs);
error_setg(errp, "Cannot use relative extent paths with VMDK "
"descriptor file '%s'", bs->file->bs->filename);
return -EINVAL;
@@ -2241,6 +2246,7 @@ static ImageInfo *vmdk_get_extent_info(VmdkExtent *extent)
{
ImageInfo *info = g_new0(ImageInfo, 1);
+ bdrv_refresh_filename(extent->file->bs);
*info = (ImageInfo){
.filename = g_strdup(extent->file->bs->filename),
.format = g_strdup(extent->type),
diff --git a/block/vpc.c b/block/vpc.c
index bf294abfa7..717809cc24 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -284,9 +284,11 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
checksum = be32_to_cpu(footer->checksum);
footer->checksum = 0;
- if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum)
+ if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) {
+ bdrv_refresh_filename(bs);
fprintf(stderr, "block-vpc: The header checksum of '%s' is "
"incorrect.\n", bs->filename);
+ }
/* Write 'checksum' back to footer, or else will leave it with zero. */
footer->checksum = cpu_to_be32(checksum);
diff --git a/blockdev.c b/blockdev.c
index a8755bd908..95a85c8cad 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1627,6 +1627,7 @@ static void external_snapshot_prepare(BlkActionState *common,
error_setg_errno(errp, -size, "bdrv_getlength failed");
goto out;
}
+ bdrv_refresh_filename(state->old_bs);
bdrv_img_create(new_image_file, format,
state->old_bs->filename,
state->old_bs->drv->format_name,
@@ -3172,6 +3173,7 @@ void qmp_block_stream(bool has_job_id, const char *job_id, const char *device,
goto out;
}
assert(bdrv_get_aio_context(base_bs) == aio_context);
+ bdrv_refresh_filename(base_bs);
base_name = base_bs->filename;
}
@@ -3291,6 +3293,10 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
goto out;
}
} else if (has_top && top) {
+ /* This strcmp() is just a shortcut, there is no need to
+ * refresh @bs's filename. If it mismatches,
+ * bdrv_find_backing_image() will do the refresh and may still
+ * return @bs. */
if (strcmp(bs->filename, top) != 0) {
top_bs = bdrv_find_backing_image(bs, top);
}
@@ -3451,6 +3457,7 @@ static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn,
if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
assert(backup->format);
if (source) {
+ bdrv_refresh_filename(source);
bdrv_img_create(backup->target, backup->format, source->filename,
source->drv->format_name, NULL,
size, flags, false, &local_err);
@@ -3810,6 +3817,7 @@ void qmp_drive_mirror(DriveMirror *arg, Error **errp)
break;
case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
/* create new image with backing file */
+ bdrv_refresh_filename(source);
bdrv_img_create(arg->target, format,
source->filename,
source->drv->format_name,
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* Re: [Qemu-devel] [PATCH v11 01/31] block: Use bdrv_refresh_filename() to pull
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 01/31] block: Use bdrv_refresh_filename() to pull Max Reitz
@ 2018-11-15 3:00 ` Eric Blake
0 siblings, 0 replies; 41+ messages in thread
From: Eric Blake @ 2018-11-15 3:00 UTC (permalink / raw)
To: Max Reitz, qemu-block; +Cc: Kevin Wolf, Alberto Garcia, qemu-devel
On 10/5/18 6:39 PM, Max Reitz wrote:
> Before this patch, bdrv_refresh_filename() is used in a pushing manner:
> Whenever the BDS graph is modified, the parents of the modified edges
> are supposed to be updated (recursively upwards). However, that is
> nonviable, considering that we want child changes not to concern
> parents.
>
> include/block/block.h | 1 -
> block.c | 31 +++++++++++++++----------------
> block/qapi.c | 4 ++++
> block/raw-format.c | 1 +
> block/replication.c | 2 --
> block/vhdx-log.c | 1 +
> block/vmdk.c | 6 ++++++
> block/vpc.c | 4 +++-
> blockdev.c | 8 ++++++++
> 9 files changed, 38 insertions(+), 20 deletions(-)
>
> +++ b/block/vpc.c
> @@ -284,9 +284,11 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
>
> checksum = be32_to_cpu(footer->checksum);
> footer->checksum = 0;
> - if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum)
> + if (vpc_checksum(s->footer_buf, HEADER_SIZE) != checksum) {
> + bdrv_refresh_filename(bs);
> fprintf(stderr, "block-vpc: The header checksum of '%s' is "
> "incorrect.\n", bs->filename);
> + }
In the intervening month, this now conflicts. I'm guessing we'll see a
v12 targeted for 4.0, since your other series on "block: Deal with
filters" depends on this one?
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
^ permalink raw reply [flat|nested] 41+ messages in thread
* [Qemu-devel] [PATCH v11 02/31] block: Use children list in bdrv_refresh_filename
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 01/31] block: Use bdrv_refresh_filename() to pull Max Reitz
@ 2018-10-05 23:39 ` Max Reitz
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 03/31] block: Skip implicit nodes for filename info Max Reitz
` (28 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:39 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
bdrv_refresh_filename() should invoke itself recursively on all
children, not just on file.
With that change, we can remove the manual invocations in blkverify,
quorum, commit, mirror, and blklogwrites.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block.c | 9 +++++----
block/blklogwrites.c | 3 ---
block/blkverify.c | 3 ---
block/commit.c | 1 -
block/mirror.c | 1 -
block/quorum.c | 1 -
6 files changed, 5 insertions(+), 13 deletions(-)
diff --git a/block.c b/block.c
index 8a7bc9308a..fd5e18081a 100644
--- a/block.c
+++ b/block.c
@@ -5224,16 +5224,17 @@ static bool append_open_options(QDict *d, BlockDriverState *bs)
void bdrv_refresh_filename(BlockDriverState *bs)
{
BlockDriver *drv = bs->drv;
+ BdrvChild *child;
QDict *opts;
if (!drv) {
return;
}
- /* This BDS's file name will most probably depend on its file's name, so
- * refresh that first */
- if (bs->file) {
- bdrv_refresh_filename(bs->file->bs);
+ /* This BDS's file name may depend on any of its children's file names, so
+ * refresh those first */
+ QLIST_FOREACH(child, &bs->children, next) {
+ bdrv_refresh_filename(child->bs);
}
if (drv->bdrv_refresh_filename) {
diff --git a/block/blklogwrites.c b/block/blklogwrites.c
index ff98cd5533..8f1b589d54 100644
--- a/block/blklogwrites.c
+++ b/block/blklogwrites.c
@@ -285,9 +285,6 @@ static void blk_log_writes_refresh_filename(BlockDriverState *bs,
{
BDRVBlkLogWritesState *s = bs->opaque;
- /* bs->file->bs has already been refreshed */
- bdrv_refresh_filename(s->log_file->bs);
-
if (bs->file->bs->full_open_options
&& s->log_file->bs->full_open_options)
{
diff --git a/block/blkverify.c b/block/blkverify.c
index 89bf4386e3..035d77b64a 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -285,9 +285,6 @@ static void blkverify_refresh_filename(BlockDriverState *bs, QDict *options)
{
BDRVBlkverifyState *s = bs->opaque;
- /* bs->file->bs has already been refreshed */
- bdrv_refresh_filename(s->test_file->bs);
-
if (bs->file->bs->full_open_options
&& s->test_file->bs->full_open_options)
{
diff --git a/block/commit.c b/block/commit.c
index a2da5740b0..dec1e89916 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -232,7 +232,6 @@ static int coroutine_fn bdrv_commit_top_preadv(BlockDriverState *bs,
static void bdrv_commit_top_refresh_filename(BlockDriverState *bs, QDict *opts)
{
- bdrv_refresh_filename(bs->backing->bs);
pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
bs->backing->bs->filename);
}
diff --git a/block/mirror.c b/block/mirror.c
index 56d9ef7474..9c9bea276d 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1438,7 +1438,6 @@ static void bdrv_mirror_top_refresh_filename(BlockDriverState *bs, QDict *opts)
* bdrv_set_backing_hd */
return;
}
- bdrv_refresh_filename(bs->backing->bs);
pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
bs->backing->bs->filename);
}
diff --git a/block/quorum.c b/block/quorum.c
index eb526cc0f1..b14e9c6ec6 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -1080,7 +1080,6 @@ static void quorum_refresh_filename(BlockDriverState *bs, QDict *options)
int i;
for (i = 0; i < s->num_children; i++) {
- bdrv_refresh_filename(s->children[i]->bs);
if (!s->children[i]->bs->full_open_options) {
return;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 03/31] block: Skip implicit nodes for filename info
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 01/31] block: Use bdrv_refresh_filename() to pull Max Reitz
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 02/31] block: Use children list in bdrv_refresh_filename Max Reitz
@ 2018-10-05 23:39 ` Max Reitz
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 04/31] block: Add BDS.auto_backing_file Max Reitz
` (27 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:39 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
bdrv_refresh_filename() should simply skip all implicit nodes. They are
supposed to be invisible to the user, so they should not appear in
filename information.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/block.c b/block.c
index fd5e18081a..4bbb278659 100644
--- a/block.c
+++ b/block.c
@@ -5237,6 +5237,20 @@ void bdrv_refresh_filename(BlockDriverState *bs)
bdrv_refresh_filename(child->bs);
}
+ if (bs->implicit) {
+ /* For implicit nodes, just copy everything from the single child */
+ child = QLIST_FIRST(&bs->children);
+ assert(QLIST_NEXT(child, next) == NULL);
+
+ pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
+ child->bs->exact_filename);
+ pstrcpy(bs->filename, sizeof(bs->filename), child->bs->filename);
+
+ bs->full_open_options = qobject_ref(child->bs->full_open_options);
+
+ return;
+ }
+
if (drv->bdrv_refresh_filename) {
/* Obsolete information is of no use here, so drop the old file name
* information before refreshing it */
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 04/31] block: Add BDS.auto_backing_file
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (2 preceding siblings ...)
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 03/31] block: Skip implicit nodes for filename info Max Reitz
@ 2018-10-05 23:39 ` Max Reitz
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 05/31] block: Respect backing bs in bdrv_refresh_filename Max Reitz
` (26 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:39 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
If the backing file is overridden, this most probably does change the
guest-visible data of a BDS. Therefore, we will need to consider this
in bdrv_refresh_filename().
To see whether it has been overridden, we might want to compare
bs->backing_file and bs->backing->bs->filename. However,
bs->backing_file is changed by bdrv_set_backing_hd() (which is just used
to change the backing child at runtime, without modifying the image
header), so bs->backing_file most of the time simply contains a copy of
bs->backing->bs->filename anyway, so it is useless for such a
comparison.
This patch adds an auto_backing_file BDS field which contains the
backing file path as indicated by the image header, which is not changed
by bdrv_set_backing_hd().
Because of bdrv_refresh_filename() magic, however, a BDS's filename may
differ from what has been specified during bdrv_open(). Then, the
comparison between bs->auto_backing_file and bs->backing->bs->filename
may fail even though bs->backing was opened from bs->auto_backing_file.
To mitigate this, we can copy the real BDS's filename (after the whole
bdrv_open() and bdrv_refresh_filename() process) into
bs->auto_backing_file, if we know the former has been opened based on
the latter. This is only possible if no options modifying the backing
file's behavior have been specified, though. To simplify things, this
patch only copies the filename from the backing file if no options have
been specified for it at all.
Furthermore, there are cases where an overlay is created by qemu which
already contains a BDS's filename (e.g. in blockdev-snapshot-sync). We
do not need to worry about updating the overlay's bs->auto_backing_file
there, because we actually wrote a post-bdrv_refresh_filename() filename
into the image header.
So all in all, there will be false negatives where (as of a future
patch) bdrv_refresh_filename() will assume that the backing file differs
from what was specified in the image header, even though it really does
not. However, these cases should be limited to where (1) the user
actually did override something in the backing chain (e.g. by specifying
options for the backing file), or (2) the user executed a QMP command to
change some node's backing file (e.g. change-backing-file or
block-commit with @backing-file given) where the given filename does not
happen to coincide with qemu's idea of the backing BDS's filename.
Then again, (1) really is limited to -drive. With -blockdev or
blockdev-add, you have to adhere to the schema, so a user cannot give
partial "unimportant" options (e.g. by just setting backing.node-name
and leaving the rest to the image header). Therefore, trying to fix
this would mean trying to fix something for -drive only.
To improve on (2), we would need a full infrastructure to "canonicalize"
an arbitrary filename (+ options), so it can be compared against
another. That seems a bit over the top, considering that filenames
nowadays are there mostly for the user's entertainment.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
include/block/block_int.h | 4 ++++
block.c | 19 +++++++++++++++++++
block/qcow.c | 7 +++++--
block/qcow2.c | 10 +++++++---
block/qed.c | 7 +++++--
block/vmdk.c | 6 ++++--
6 files changed, 44 insertions(+), 9 deletions(-)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 92ecbd866e..385070f373 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -696,6 +696,10 @@ struct BlockDriverState {
char filename[PATH_MAX];
char backing_file[PATH_MAX]; /* if non zero, the image is a diff of
this file image */
+ /* The backing filename indicated by the image header; if we ever
+ * open this file, then this is replaced by the resulting BDS's
+ * filename (i.e. after a bdrv_refresh_filename() run). */
+ char auto_backing_file[PATH_MAX];
char backing_format[16]; /* if non-zero and backing_file exists */
QDict *full_open_options;
diff --git a/block.c b/block.c
index 4bbb278659..e158c4b4bb 100644
--- a/block.c
+++ b/block.c
@@ -2281,6 +2281,7 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
char *bdref_key_dot;
const char *reference = NULL;
int ret = 0;
+ bool implicit_backing = false;
BlockDriverState *backing_hd;
QDict *options;
QDict *tmp_parent_options = NULL;
@@ -2316,6 +2317,16 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
qobject_unref(options);
goto free_exit;
} else {
+ if (qdict_size(options) == 0) {
+ /* If the user specifies options that do not modify the
+ * backing file's behavior, we might still consider it the
+ * implicit backing file. But it's easier this way, and
+ * just specifying some of the backing BDS's options is
+ * only possible with -drive anyway (otherwise the QAPI
+ * schema forces the user to specify everything). */
+ implicit_backing = !strcmp(bs->auto_backing_file, bs->backing_file);
+ }
+
bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX,
&local_err);
if (local_err) {
@@ -2349,6 +2360,12 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
}
bdrv_set_aio_context(backing_hd, bdrv_get_aio_context(bs));
+ if (implicit_backing) {
+ bdrv_refresh_filename(backing_hd);
+ pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file),
+ backing_hd->filename);
+ }
+
/* Hook up the backing file link; drop our reference, bs owns the
* backing_hd reference now */
bdrv_set_backing_hd(bs, backing_hd, &local_err);
@@ -3729,6 +3746,8 @@ int bdrv_change_backing_file(BlockDriverState *bs,
if (ret == 0) {
pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: "");
pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: "");
+ pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file),
+ backing_file ?: "");
}
return ret;
}
diff --git a/block/qcow.c b/block/qcow.c
index 385d935258..20f610ec74 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -31,6 +31,7 @@
#include "qemu/module.h"
#include "qemu/option.h"
#include "qemu/bswap.h"
+#include "qemu/cutils.h"
#include <zlib.h>
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qstring.h"
@@ -295,11 +296,13 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
goto fail;
}
ret = bdrv_pread(bs->file, header.backing_file_offset,
- bs->backing_file, len);
+ bs->auto_backing_file, len);
if (ret < 0) {
goto fail;
}
- bs->backing_file[len] = '\0';
+ bs->auto_backing_file[len] = '\0';
+ pstrcpy(bs->backing_file, sizeof(bs->backing_file),
+ bs->auto_backing_file);
}
/* Disable migration when qcow images are used */
diff --git a/block/qcow2.c b/block/qcow2.c
index 7277feda13..972eb8d8c4 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1465,13 +1465,15 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
goto fail;
}
ret = bdrv_pread(bs->file, header.backing_file_offset,
- bs->backing_file, len);
+ bs->auto_backing_file, len);
if (ret < 0) {
error_setg_errno(errp, -ret, "Could not read backing file name");
goto fail;
}
- bs->backing_file[len] = '\0';
- s->image_backing_file = g_strdup(bs->backing_file);
+ bs->auto_backing_file[len] = '\0';
+ pstrcpy(bs->backing_file, sizeof(bs->backing_file),
+ bs->auto_backing_file);
+ s->image_backing_file = g_strdup(bs->auto_backing_file);
}
/* Internal snapshots */
@@ -2465,6 +2467,8 @@ static int qcow2_change_backing_file(BlockDriverState *bs,
return -EINVAL;
}
+ pstrcpy(bs->auto_backing_file, sizeof(bs->auto_backing_file),
+ backing_file ?: "");
pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: "");
pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: "");
diff --git a/block/qed.c b/block/qed.c
index 689ea9d4d5..1419cbe3c9 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -454,11 +454,14 @@ static int coroutine_fn bdrv_qed_do_open(BlockDriverState *bs, QDict *options,
}
ret = qed_read_string(bs->file, s->header.backing_filename_offset,
- s->header.backing_filename_size, bs->backing_file,
- sizeof(bs->backing_file));
+ s->header.backing_filename_size,
+ bs->auto_backing_file,
+ sizeof(bs->auto_backing_file));
if (ret < 0) {
return ret;
}
+ pstrcpy(bs->backing_file, sizeof(bs->backing_file),
+ bs->auto_backing_file);
if (s->header.features & QED_F_BACKING_FORMAT_NO_PROBE) {
pstrcpy(bs->backing_format, sizeof(bs->backing_format), "raw");
diff --git a/block/vmdk.c b/block/vmdk.c
index bb6033d409..c7484fddb6 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -386,12 +386,14 @@ static int vmdk_parent_open(BlockDriverState *bs)
ret = -EINVAL;
goto out;
}
- if ((end_name - p_name) > sizeof(bs->backing_file) - 1) {
+ if ((end_name - p_name) > sizeof(bs->auto_backing_file) - 1) {
ret = -EINVAL;
goto out;
}
- pstrcpy(bs->backing_file, end_name - p_name + 1, p_name);
+ pstrcpy(bs->auto_backing_file, end_name - p_name + 1, p_name);
+ pstrcpy(bs->backing_file, sizeof(bs->backing_file),
+ bs->auto_backing_file);
}
out:
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 05/31] block: Respect backing bs in bdrv_refresh_filename
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (3 preceding siblings ...)
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 04/31] block: Add BDS.auto_backing_file Max Reitz
@ 2018-10-05 23:39 ` Max Reitz
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 06/31] iotests.py: Add filter_imgfmt() Max Reitz
` (25 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:39 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Basically, bdrv_refresh_filename() should respect all children of a
BlockDriverState. However, generally those children are driver-specific,
so this function cannot handle the general case. On the other hand,
there are only few drivers which use other children than @file and
@backing (that being vmdk, quorum, and blkverify).
Most block drivers only use @file and/or @backing (if they use any
children at all). Both can be implemented directly in
bdrv_refresh_filename.
The user overriding the file's filename is already handled, however, the
user overriding the backing file is not. If this is done, opening the
BDS with the plain filename of its file will not be correct, so we may
not set bs->exact_filename in that case.
iotest 051 contains test cases for overriding the backing file, and so
its output changes with this patch applied.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block.c | 38 ++++++++++++++++++++++++++++++++++-
tests/qemu-iotests/051.out | 8 ++++----
tests/qemu-iotests/051.pc.out | 8 ++++----
3 files changed, 45 insertions(+), 9 deletions(-)
diff --git a/block.c b/block.c
index e158c4b4bb..b9afdab601 100644
--- a/block.c
+++ b/block.c
@@ -5228,6 +5228,21 @@ static bool append_open_options(QDict *d, BlockDriverState *bs)
return found_any;
}
+/* Note: This function may return false positives; it may return true
+ * even if opening the backing file specified by bs's image header
+ * would result in exactly bs->backing. */
+static bool bdrv_backing_overridden(BlockDriverState *bs)
+{
+ if (bs->backing) {
+ return strcmp(bs->auto_backing_file,
+ bs->backing->bs->filename);
+ } else {
+ /* No backing BDS, so if the image header reports any backing
+ * file, it must have been suppressed */
+ return bs->auto_backing_file[0] != '\0';
+ }
+}
+
/* Updates the following BDS fields:
* - exact_filename: A filename which may be used for opening a block device
* which (mostly) equals the given BDS (even without any
@@ -5245,6 +5260,7 @@ void bdrv_refresh_filename(BlockDriverState *bs)
BlockDriver *drv = bs->drv;
BdrvChild *child;
QDict *opts;
+ bool backing_overridden;
if (!drv) {
return;
@@ -5270,6 +5286,16 @@ void bdrv_refresh_filename(BlockDriverState *bs)
return;
}
+ backing_overridden = bdrv_backing_overridden(bs);
+
+ if (bs->open_flags & BDRV_O_NO_IO) {
+ /* Without I/O, the backing file does not change anything.
+ * Therefore, in such a case (primarily qemu-img), we can
+ * pretend the backing file has not been overridden even if
+ * it technically has been. */
+ backing_overridden = false;
+ }
+
if (drv->bdrv_refresh_filename) {
/* Obsolete information is of no use here, so drop the old file name
* information before refreshing it */
@@ -5295,6 +5321,7 @@ void bdrv_refresh_filename(BlockDriverState *bs)
opts = qdict_new();
has_open_options = append_open_options(opts, bs);
+ has_open_options |= backing_overridden;
/* If no specific options have been given for this BDS, the filename of
* the underlying file should suffice for this one as well */
@@ -5306,11 +5333,20 @@ void bdrv_refresh_filename(BlockDriverState *bs)
* file BDS. The full options QDict of that file BDS should somehow
* contain a representation of the filename, therefore the following
* suffices without querying the (exact_)filename of this BDS. */
- if (bs->file->bs->full_open_options) {
+ if (bs->file->bs->full_open_options &&
+ (!bs->backing || bs->backing->bs->full_open_options))
+ {
qdict_put_str(opts, "driver", drv->format_name);
qdict_put(opts, "file",
qobject_ref(bs->file->bs->full_open_options));
+ if (bs->backing) {
+ qdict_put(opts, "backing",
+ qobject_ref(bs->backing->bs->full_open_options));
+ } else if (backing_overridden) {
+ qdict_put_null(opts, "backing");
+ }
+
bs->full_open_options = opts;
} else {
qobject_unref(opts);
diff --git a/tests/qemu-iotests/051.out b/tests/qemu-iotests/051.out
index 793af2ab96..b900935fbc 100644
--- a/tests/qemu-iotests/051.out
+++ b/tests/qemu-iotests/051.out
@@ -82,7 +82,7 @@ QEMU X.Y.Z monitor - type 'help' for more information
Testing: -drive file=TEST_DIR/t.qcow2,driver=qcow2,backing.file.filename=TEST_DIR/t.qcow2.orig,if=none,id=drive0 -nodefaults
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) info block
-drive0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+drive0 (NODE_NAME): json:{"backing": {"driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2.orig"}}, "driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2"}} (qcow2)
Removable device: not locked, tray closed
Cache mode: writeback
Backing file: TEST_DIR/t.qcow2.orig (chain depth: 1)
@@ -172,7 +172,7 @@ QEMU_PROG: -drive driver=null-co,cache=invalid_value: invalid cache option
Testing: -drive file=TEST_DIR/t.qcow2,cache=writeback,backing.file.filename=TEST_DIR/t.qcow2.base,backing.cache.no-flush=on,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,if=none,id=drive0 -nodefaults
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) info block
-drive0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+drive0 (NODE_NAME): json:{"backing": {"driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2.base"}}, "driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2"}} (qcow2)
Removable device: not locked, tray closed
Cache mode: writeback
Backing file: TEST_DIR/t.qcow2.base (chain depth: 1)
@@ -192,7 +192,7 @@ backing-file: TEST_DIR/t.qcow2.base (file, read-only)
Testing: -drive file=TEST_DIR/t.qcow2,cache=writethrough,backing.file.filename=TEST_DIR/t.qcow2.base,backing.cache.no-flush=on,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,if=none,id=drive0 -nodefaults
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) info block
-drive0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+drive0 (NODE_NAME): json:{"backing": {"driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2.base"}}, "driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2"}} (qcow2)
Removable device: not locked, tray closed
Cache mode: writethrough
Backing file: TEST_DIR/t.qcow2.base (chain depth: 1)
@@ -212,7 +212,7 @@ backing-file: TEST_DIR/t.qcow2.base (file, read-only)
Testing: -drive file=TEST_DIR/t.qcow2,cache=unsafe,backing.file.filename=TEST_DIR/t.qcow2.base,backing.cache.no-flush=on,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,if=none,id=drive0 -nodefaults
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) info block
-drive0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+drive0 (NODE_NAME): json:{"backing": {"driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2.base"}}, "driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2"}} (qcow2)
Removable device: not locked, tray closed
Cache mode: writeback, ignore flushes
Backing file: TEST_DIR/t.qcow2.base (chain depth: 1)
diff --git a/tests/qemu-iotests/051.pc.out b/tests/qemu-iotests/051.pc.out
index ca64edae6a..8c5c735dfd 100644
--- a/tests/qemu-iotests/051.pc.out
+++ b/tests/qemu-iotests/051.pc.out
@@ -82,7 +82,7 @@ QEMU X.Y.Z monitor - type 'help' for more information
Testing: -drive file=TEST_DIR/t.qcow2,driver=qcow2,backing.file.filename=TEST_DIR/t.qcow2.orig,if=none,id=drive0 -nodefaults
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) info block
-drive0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+drive0 (NODE_NAME): json:{"backing": {"driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2.orig"}}, "driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2"}} (qcow2)
Removable device: not locked, tray closed
Cache mode: writeback
Backing file: TEST_DIR/t.qcow2.orig (chain depth: 1)
@@ -244,7 +244,7 @@ QEMU_PROG: -drive driver=null-co,cache=invalid_value: invalid cache option
Testing: -drive file=TEST_DIR/t.qcow2,cache=writeback,backing.file.filename=TEST_DIR/t.qcow2.base,backing.cache.no-flush=on,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,if=none,id=drive0 -nodefaults
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) info block
-drive0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+drive0 (NODE_NAME): json:{"backing": {"driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2.base"}}, "driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2"}} (qcow2)
Removable device: not locked, tray closed
Cache mode: writeback
Backing file: TEST_DIR/t.qcow2.base (chain depth: 1)
@@ -264,7 +264,7 @@ backing-file: TEST_DIR/t.qcow2.base (file, read-only)
Testing: -drive file=TEST_DIR/t.qcow2,cache=writethrough,backing.file.filename=TEST_DIR/t.qcow2.base,backing.cache.no-flush=on,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,if=none,id=drive0 -nodefaults
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) info block
-drive0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+drive0 (NODE_NAME): json:{"backing": {"driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2.base"}}, "driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2"}} (qcow2)
Removable device: not locked, tray closed
Cache mode: writethrough
Backing file: TEST_DIR/t.qcow2.base (chain depth: 1)
@@ -284,7 +284,7 @@ backing-file: TEST_DIR/t.qcow2.base (file, read-only)
Testing: -drive file=TEST_DIR/t.qcow2,cache=unsafe,backing.file.filename=TEST_DIR/t.qcow2.base,backing.cache.no-flush=on,backing.node-name=backing,backing.file.node-name=backing-file,file.node-name=file,if=none,id=drive0 -nodefaults
QEMU X.Y.Z monitor - type 'help' for more information
(qemu) info block
-drive0 (NODE_NAME): TEST_DIR/t.qcow2 (qcow2)
+drive0 (NODE_NAME): json:{"backing": {"driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2.base"}}, "driver": "qcow2", "file": {"driver": "file", "filename": "TEST_DIR/t.qcow2"}} (qcow2)
Removable device: not locked, tray closed
Cache mode: writeback, ignore flushes
Backing file: TEST_DIR/t.qcow2.base (chain depth: 1)
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 06/31] iotests.py: Add filter_imgfmt()
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (4 preceding siblings ...)
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 05/31] block: Respect backing bs in bdrv_refresh_filename Max Reitz
@ 2018-10-05 23:39 ` Max Reitz
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 07/31] iotests.py: Add node_info() Max Reitz
` (24 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:39 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
tests/qemu-iotests/iotests.py | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 4e67fbbe96..5c45788dac 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -246,6 +246,9 @@ def filter_img_info(output, filename):
lines.append(line)
return '\n'.join(lines)
+def filter_imgfmt(msg):
+ return msg.replace(imgfmt, 'IMGFMT')
+
def log(msg, filters=[]):
for flt in filters:
msg = flt(msg)
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 07/31] iotests.py: Add node_info()
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (5 preceding siblings ...)
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 06/31] iotests.py: Add filter_imgfmt() Max Reitz
@ 2018-10-05 23:39 ` Max Reitz
2018-10-08 19:34 ` [Qemu-devel] [Qemu-block] " John Snow
` (2 more replies)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 08/31] iotests: Add test for backing file overrides Max Reitz
` (23 subsequent siblings)
30 siblings, 3 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:39 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
This function queries a node; since we cannot do that right now, it
executes query-named-block-nodes and returns the matching node's object.
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/iotests.py | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 5c45788dac..604f200600 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -465,6 +465,13 @@ class VM(qtest.QEMUQtestMachine):
else:
iotests.log(ev)
+ def node_info(self, node_name):
+ nodes = self.qmp('query-named-block-nodes')
+ for x in nodes['return']:
+ if x['node-name'] == node_name:
+ return x
+ return None
+
index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* Re: [Qemu-devel] [Qemu-block] [PATCH v11 07/31] iotests.py: Add node_info()
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 07/31] iotests.py: Add node_info() Max Reitz
@ 2018-10-08 19:34 ` John Snow
2018-10-08 19:57 ` Max Reitz
2018-10-09 12:14 ` [Qemu-devel] " Alberto Garcia
2018-11-15 2:56 ` Eric Blake
2 siblings, 1 reply; 41+ messages in thread
From: John Snow @ 2018-10-08 19:34 UTC (permalink / raw)
To: Max Reitz, qemu-block; +Cc: Kevin Wolf, qemu-devel
On 10/05/2018 07:39 PM, Max Reitz wrote:
> This function queries a node; since we cannot do that right now, it
> executes query-named-block-nodes and returns the matching node's object.
>
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
> tests/qemu-iotests/iotests.py | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
> index 5c45788dac..604f200600 100644
> --- a/tests/qemu-iotests/iotests.py
> +++ b/tests/qemu-iotests/iotests.py
> @@ -465,6 +465,13 @@ class VM(qtest.QEMUQtestMachine):
> else:
> iotests.log(ev)
>
> + def node_info(self, node_name):
> + nodes = self.qmp('query-named-block-nodes')
> + for x in nodes['return']:
> + if x['node-name'] == node_name:
> + return x
> + return None
> +
>
> index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
>
>
Reviewed-by: John Snow <jsnow@redhat.com>
Do we ever want to revisit the idea that our API should not do any
pre-filtering and that it's always up to the client to do so?
--js
^ permalink raw reply [flat|nested] 41+ messages in thread* Re: [Qemu-devel] [Qemu-block] [PATCH v11 07/31] iotests.py: Add node_info()
2018-10-08 19:34 ` [Qemu-devel] [Qemu-block] " John Snow
@ 2018-10-08 19:57 ` Max Reitz
2018-10-08 19:59 ` John Snow
0 siblings, 1 reply; 41+ messages in thread
From: Max Reitz @ 2018-10-08 19:57 UTC (permalink / raw)
To: John Snow, qemu-block; +Cc: Kevin Wolf, qemu-devel
[-- Attachment #1: Type: text/plain, Size: 1370 bytes --]
On 08.10.18 21:34, John Snow wrote:
>
>
> On 10/05/2018 07:39 PM, Max Reitz wrote:
>> This function queries a node; since we cannot do that right now, it
>> executes query-named-block-nodes and returns the matching node's object.
>>
>> Signed-off-by: Max Reitz <mreitz@redhat.com>
>> ---
>> tests/qemu-iotests/iotests.py | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
>> index 5c45788dac..604f200600 100644
>> --- a/tests/qemu-iotests/iotests.py
>> +++ b/tests/qemu-iotests/iotests.py
>> @@ -465,6 +465,13 @@ class VM(qtest.QEMUQtestMachine):
>> else:
>> iotests.log(ev)
>>
>> + def node_info(self, node_name):
>> + nodes = self.qmp('query-named-block-nodes')
>> + for x in nodes['return']:
>> + if x['node-name'] == node_name:
>> + return x
>> + return None
>> +
>>
>> index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
>>
>>
>
> Reviewed-by: John Snow <jsnow@redhat.com>
>
> Do we ever want to revisit the idea that our API should not do any
> pre-filtering and that it's always up to the client to do so?
I mean we certainly want to revisit the idea that we should have a
proper query API.
But what exactly do you mean by pre-filtering?
Max
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^ permalink raw reply [flat|nested] 41+ messages in thread* Re: [Qemu-devel] [Qemu-block] [PATCH v11 07/31] iotests.py: Add node_info()
2018-10-08 19:57 ` Max Reitz
@ 2018-10-08 19:59 ` John Snow
2018-10-08 20:18 ` Max Reitz
0 siblings, 1 reply; 41+ messages in thread
From: John Snow @ 2018-10-08 19:59 UTC (permalink / raw)
To: Max Reitz, qemu-block; +Cc: Kevin Wolf, qemu-devel
On 10/08/2018 03:57 PM, Max Reitz wrote:
> On 08.10.18 21:34, John Snow wrote:
>>
>>
>> On 10/05/2018 07:39 PM, Max Reitz wrote:
>>> This function queries a node; since we cannot do that right now, it
>>> executes query-named-block-nodes and returns the matching node's object.
>>>
>>> Signed-off-by: Max Reitz <mreitz@redhat.com>
>>> ---
>>> tests/qemu-iotests/iotests.py | 7 +++++++
>>> 1 file changed, 7 insertions(+)
>>>
>>> diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
>>> index 5c45788dac..604f200600 100644
>>> --- a/tests/qemu-iotests/iotests.py
>>> +++ b/tests/qemu-iotests/iotests.py
>>> @@ -465,6 +465,13 @@ class VM(qtest.QEMUQtestMachine):
>>> else:
>>> iotests.log(ev)
>>>
>>> + def node_info(self, node_name):
>>> + nodes = self.qmp('query-named-block-nodes')
>>> + for x in nodes['return']:
>>> + if x['node-name'] == node_name:
>>> + return x
>>> + return None
>>> +
>>>
>>> index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
>>>
>>>
>>
>> Reviewed-by: John Snow <jsnow@redhat.com>
>>
>> Do we ever want to revisit the idea that our API should not do any
>> pre-filtering and that it's always up to the client to do so?
>
> I mean we certainly want to revisit the idea that we should have a
> proper query API.
>
> But what exactly do you mean by pre-filtering?
>
> Max
>
i.e. applying selection criteria before responding to the query. e.g.,
by looking for matches on node-name.
(Did I use i.e. and e.g. right?)
--js
^ permalink raw reply [flat|nested] 41+ messages in thread* Re: [Qemu-devel] [Qemu-block] [PATCH v11 07/31] iotests.py: Add node_info()
2018-10-08 19:59 ` John Snow
@ 2018-10-08 20:18 ` Max Reitz
0 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-08 20:18 UTC (permalink / raw)
To: John Snow, qemu-block; +Cc: Kevin Wolf, qemu-devel
[-- Attachment #1: Type: text/plain, Size: 2993 bytes --]
On 08.10.18 21:59, John Snow wrote:
>
>
> On 10/08/2018 03:57 PM, Max Reitz wrote:
>> On 08.10.18 21:34, John Snow wrote:
>>>
>>>
>>> On 10/05/2018 07:39 PM, Max Reitz wrote:
>>>> This function queries a node; since we cannot do that right now, it
>>>> executes query-named-block-nodes and returns the matching node's object.
>>>>
>>>> Signed-off-by: Max Reitz <mreitz@redhat.com>
>>>> ---
>>>> tests/qemu-iotests/iotests.py | 7 +++++++
>>>> 1 file changed, 7 insertions(+)
>>>>
>>>> diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
>>>> index 5c45788dac..604f200600 100644
>>>> --- a/tests/qemu-iotests/iotests.py
>>>> +++ b/tests/qemu-iotests/iotests.py
>>>> @@ -465,6 +465,13 @@ class VM(qtest.QEMUQtestMachine):
>>>> else:
>>>> iotests.log(ev)
>>>>
>>>> + def node_info(self, node_name):
>>>> + nodes = self.qmp('query-named-block-nodes')
>>>> + for x in nodes['return']:
>>>> + if x['node-name'] == node_name:
>>>> + return x
>>>> + return None
>>>> +
>>>>
>>>> index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
>>>>
>>>>
>>>
>>> Reviewed-by: John Snow <jsnow@redhat.com>
>>>
>>> Do we ever want to revisit the idea that our API should not do any
>>> pre-filtering and that it's always up to the client to do so?
>>
>> I mean we certainly want to revisit the idea that we should have a
>> proper query API.
>>
>> But what exactly do you mean by pre-filtering?
>>
>> Max
>>
>
> i.e. applying selection criteria before responding to the query. e.g.,
> by looking for matches on node-name.
>
> (Did I use i.e. and e.g. right?)
So you mean our API should do pre-filtering at the request of the client
and the client shouldn't be fed all nodes and then have to do
post-filtering?
Well, I certainly think we want a query command that doesn't return all
nodes. I personally would prefer something that only returns a single
node in the graph and its relationships, although I'm not sure whether
that is very efficient. Maybe something like inverse blockdev-add, were
the user can specify a depth on how deep references should be expanded.
Overall, I'm of the impression we want to have blockdev-reopen first so
that we have a good idea of the type of information we want to report
for a node; that being its node options, first and foremost. Probably
some stats as well, though.
Max
(The i.e. looks weird because you're not expanding a thought you've just
given, but you're actually responding to my question. It's like saying
"I want feature A." -- "We can do that, do you have any other remarks?"
-- "And I want B, too." So I would have started either with "e.g." (if
you think there are other things that could be meant by pre-filtering),
or by e.g. "I thought of". Probably the latter, since that is how I
interpreted your "i.e.".)
((Did I use the semicolon correctly?))
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^ permalink raw reply [flat|nested] 41+ messages in thread
* Re: [Qemu-devel] [PATCH v11 07/31] iotests.py: Add node_info()
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 07/31] iotests.py: Add node_info() Max Reitz
2018-10-08 19:34 ` [Qemu-devel] [Qemu-block] " John Snow
@ 2018-10-09 12:14 ` Alberto Garcia
2018-11-15 2:56 ` Eric Blake
2 siblings, 0 replies; 41+ messages in thread
From: Alberto Garcia @ 2018-10-09 12:14 UTC (permalink / raw)
To: Max Reitz, qemu-block; +Cc: qemu-devel, Kevin Wolf
On Sat 06 Oct 2018 01:39:59 AM CEST, Max Reitz wrote:
> This function queries a node; since we cannot do that right now, it
> executes query-named-block-nodes and returns the matching node's object.
>
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
Reviewed-by: Alberto Garcia <berto@igalia.com>
Berto
^ permalink raw reply [flat|nested] 41+ messages in thread
* Re: [Qemu-devel] [PATCH v11 07/31] iotests.py: Add node_info()
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 07/31] iotests.py: Add node_info() Max Reitz
2018-10-08 19:34 ` [Qemu-devel] [Qemu-block] " John Snow
2018-10-09 12:14 ` [Qemu-devel] " Alberto Garcia
@ 2018-11-15 2:56 ` Eric Blake
2 siblings, 0 replies; 41+ messages in thread
From: Eric Blake @ 2018-11-15 2:56 UTC (permalink / raw)
To: Max Reitz, qemu-block; +Cc: Kevin Wolf, Alberto Garcia, qemu-devel
On 10/5/18 6:39 PM, Max Reitz wrote:
> This function queries a node; since we cannot do that right now, it
> executes query-named-block-nodes and returns the matching node's object.
>
> Signed-off-by: Max Reitz <mreitz@redhat.com>
> ---
> tests/qemu-iotests/iotests.py | 7 +++++++
> 1 file changed, 7 insertions(+)
>
Reviewed-by: Eric Blake <eblake@redhat.com>
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
^ permalink raw reply [flat|nested] 41+ messages in thread
* [Qemu-devel] [PATCH v11 08/31] iotests: Add test for backing file overrides
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (6 preceding siblings ...)
2018-10-05 23:39 ` [Qemu-devel] [PATCH v11 07/31] iotests.py: Add node_info() Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 09/31] block: Make path_combine() return the path Max Reitz
` (22 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
tests/qemu-iotests/228 | 235 +++++++++++++++++++++++++++++++++++++
tests/qemu-iotests/228.out | 84 +++++++++++++
tests/qemu-iotests/group | 1 +
3 files changed, 320 insertions(+)
create mode 100755 tests/qemu-iotests/228
create mode 100644 tests/qemu-iotests/228.out
diff --git a/tests/qemu-iotests/228 b/tests/qemu-iotests/228
new file mode 100755
index 0000000000..a2200efba5
--- /dev/null
+++ b/tests/qemu-iotests/228
@@ -0,0 +1,235 @@
+#!/usr/bin/env python
+#
+# Test for when a backing file is considered overridden (thus, a
+# json:{} filename is generated for the overlay) and when it is not
+#
+# Copyright (C) 2018 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# Creator/Owner: Max Reitz <mreitz@redhat.com>
+
+import iotests
+from iotests import log, qemu_img, filter_testfiles, filter_imgfmt
+
+# Need backing file and change-backing-file support
+iotests.verify_image_format(supported_fmts=['qcow2', 'qed'])
+iotests.verify_platform(['linux'])
+
+
+def log_node_info(node):
+ log('')
+
+ log('bs->filename: ' + node['image']['filename'],
+ filters=[filter_testfiles, filter_imgfmt])
+ log('bs->backing_file: ' + node['backing_file'],
+ filters=[filter_testfiles, filter_imgfmt])
+
+ if 'backing-image' in node['image']:
+ log('bs->backing->bs->filename: ' +
+ node['image']['backing-image']['filename'],
+ filters=[filter_testfiles, filter_imgfmt])
+ else:
+ log('bs->backing: (none)')
+
+ log('')
+
+
+with iotests.FilePath('base.img') as base_img_path, \
+ iotests.FilePath('top.img') as top_img_path, \
+ iotests.VM() as vm:
+
+ assert qemu_img('create', '-f', iotests.imgfmt, base_img_path, '64M') == 0
+ # Choose a funny way to describe the backing filename
+ assert qemu_img('create', '-f', iotests.imgfmt, '-b',
+ 'file:' + base_img_path, top_img_path) == 0
+
+ vm.launch()
+
+ log('--- Implicit backing file ---')
+ log('')
+
+ vm.qmp_log('blockdev-add',
+ node_name='node0',
+ driver=iotests.imgfmt,
+ file={
+ 'driver': 'file',
+ 'filename': top_img_path
+ },
+ filters=[filter_testfiles, filter_imgfmt])
+
+ # Filename should be plain, and the backing filename should not
+ # contain the "file:" prefix
+ log_node_info(vm.node_info('node0'))
+
+ vm.qmp_log('blockdev-del', node_name='node0')
+
+ log('')
+ log('--- change-backing-file ---')
+ log('')
+
+ vm.qmp_log('blockdev-add',
+ node_name='node0',
+ driver=iotests.imgfmt,
+ file={
+ 'driver': 'file',
+ 'filename': top_img_path
+ },
+ filters=[filter_testfiles, filter_imgfmt])
+
+ # Changing the backing file to a qemu-reported filename should
+ # result in qemu accepting the corresponding BDS as the implicit
+ # backing BDS (and thus not generate a json:{} filename).
+ # So, first, query the backing filename.
+
+ backing_filename = \
+ vm.node_info('node0')['image']['backing-image']['filename']
+
+ # Next, change the backing file to something different
+
+ vm.qmp_log('change-backing-file',
+ image_node_name='node0',
+ device='node0',
+ backing_file='null-co://')
+
+ # Now, verify that we get a json:{} filename
+ # (Image header says "null-co://", actual backing file still is
+ # base_img_path)
+
+ log_node_info(vm.node_info('node0'))
+
+ # Change it back
+ # (To get header and backing file in sync)
+
+ vm.qmp_log('change-backing-file',
+ image_node_name='node0',
+ device='node0',
+ backing_file=backing_filename)
+
+ # And verify that we get our original results
+
+ log_node_info(vm.node_info('node0'))
+
+ # Finally, try a "file:" prefix. While this is actually what we
+ # originally had in the image header, qemu will not reopen the
+ # backing file here, so it cannot verify that this filename
+ # "resolves" to the actual backing BDS's filename and will thus
+ # consider both to be different.
+ # (This may be fixed in the future.)
+
+ vm.qmp_log('change-backing-file',
+ image_node_name='node0',
+ device='node0',
+ backing_file=('file:' + backing_filename))
+
+ # So now we should get a json:{} filename
+
+ log_node_info(vm.node_info('node0'))
+
+ # Remove and re-attach so we can see that (as in our first try),
+ # opening the image anew helps qemu resolve the header backing
+ # filename.
+
+ vm.qmp_log('blockdev-del', node_name='node0')
+
+ vm.qmp_log('blockdev-add',
+ node_name='node0',
+ driver=iotests.imgfmt,
+ file={
+ 'driver': 'file',
+ 'filename': top_img_path
+ },
+ filters=[filter_testfiles, filter_imgfmt])
+
+ log_node_info(vm.node_info('node0'))
+
+ vm.qmp_log('blockdev-del', node_name='node0')
+
+ log('')
+ log('--- Override backing file ---')
+ log('')
+
+ # For this test, we need the plain filename in the image header
+ # (because qemu cannot "canonicalize"/"resolve" the backing
+ # filename unless the backing file is opened implicitly with the
+ # overlay)
+ assert qemu_img('create', '-f', iotests.imgfmt, '-b', base_img_path,
+ top_img_path) == 0
+
+ # You can only reliably override backing options by using a node
+ # reference (or by specifying file.filename, but, well...)
+ vm.qmp_log('blockdev-add', node_name='null', driver='null-co')
+
+ vm.qmp_log('blockdev-add',
+ node_name='node0',
+ driver=iotests.imgfmt,
+ file={
+ 'driver': 'file',
+ 'filename': top_img_path
+ },
+ backing='null',
+ filters=[filter_testfiles, filter_imgfmt])
+
+ # Should get a json:{} filename (and bs->backing_file is
+ # null-co://, because that field actually has not much to do
+ # with the header backing filename (except that it is changed by
+ # change-backing-file))
+
+ log_node_info(vm.node_info('node0'))
+
+ # Detach the backing file by reopening the whole thing
+
+ vm.qmp_log('blockdev-del', node_name='node0')
+ vm.qmp_log('blockdev-del', node_name='null')
+
+ vm.qmp_log('blockdev-add',
+ node_name='node0',
+ driver=iotests.imgfmt,
+ file={
+ 'driver': 'file',
+ 'filename': top_img_path
+ },
+ backing=None,
+ filters=[filter_testfiles, filter_imgfmt])
+
+ # Should get a json:{} filename (because we overrode the backing
+ # file to not be there)
+
+ log_node_info(vm.node_info('node0'))
+
+ # Open the original backing file
+
+ vm.qmp_log('blockdev-add',
+ node_name='original-backing',
+ driver=iotests.imgfmt,
+ file={
+ 'driver': 'file',
+ 'filename': base_img_path
+ },
+ filters=[filter_testfiles, filter_imgfmt])
+
+ # Attach the original backing file to its overlay
+
+ vm.qmp_log('blockdev-snapshot',
+ node='original-backing',
+ overlay='node0')
+
+ # This should give us the original plain result
+
+ log_node_info(vm.node_info('node0'))
+
+ vm.qmp_log('blockdev-del', node_name='node0')
+ vm.qmp_log('blockdev-del', node_name='original-backing')
+
+ vm.shutdown()
diff --git a/tests/qemu-iotests/228.out b/tests/qemu-iotests/228.out
new file mode 100644
index 0000000000..b01de766bc
--- /dev/null
+++ b/tests/qemu-iotests/228.out
@@ -0,0 +1,84 @@
+--- Implicit backing file ---
+
+{'execute': 'blockdev-add', 'arguments': {'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-top.img'}, 'node_name': 'node0'}}
+{u'return': {}}
+
+bs->filename: TEST_DIR/PID-top.img
+bs->backing_file: TEST_DIR/PID-base.img
+bs->backing->bs->filename: TEST_DIR/PID-base.img
+
+{'execute': 'blockdev-del', 'arguments': {'node_name': 'node0'}}
+{u'return': {}}
+
+--- change-backing-file ---
+
+{'execute': 'blockdev-add', 'arguments': {'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-top.img'}, 'node_name': 'node0'}}
+{u'return': {}}
+{'execute': 'change-backing-file', 'arguments': {'device': 'node0', 'image_node_name': 'node0', 'backing_file': 'null-co://'}}
+{u'return': {}}
+
+bs->filename: json:{"backing": {"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-base.img"}}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}}
+bs->backing_file: null-co://
+bs->backing->bs->filename: TEST_DIR/PID-base.img
+
+{'execute': 'change-backing-file', 'arguments': {'device': 'node0', 'image_node_name': 'node0', 'backing_file': u'TEST_DIR/PID-base.img'}}
+{u'return': {}}
+
+bs->filename: TEST_DIR/PID-top.img
+bs->backing_file: TEST_DIR/PID-base.img
+bs->backing->bs->filename: TEST_DIR/PID-base.img
+
+{'execute': 'change-backing-file', 'arguments': {'device': 'node0', 'image_node_name': 'node0', 'backing_file': u'file:TEST_DIR/PID-base.img'}}
+{u'return': {}}
+
+bs->filename: json:{"backing": {"driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-base.img"}}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}}
+bs->backing_file: file:TEST_DIR/PID-base.img
+bs->backing->bs->filename: TEST_DIR/PID-base.img
+
+{'execute': 'blockdev-del', 'arguments': {'node_name': 'node0'}}
+{u'return': {}}
+{'execute': 'blockdev-add', 'arguments': {'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-top.img'}, 'node_name': 'node0'}}
+{u'return': {}}
+
+bs->filename: TEST_DIR/PID-top.img
+bs->backing_file: TEST_DIR/PID-base.img
+bs->backing->bs->filename: TEST_DIR/PID-base.img
+
+{'execute': 'blockdev-del', 'arguments': {'node_name': 'node0'}}
+{u'return': {}}
+
+--- Override backing file ---
+
+{'execute': 'blockdev-add', 'arguments': {'driver': 'null-co', 'node_name': 'null'}}
+{u'return': {}}
+{'execute': 'blockdev-add', 'arguments': {'backing': 'null', 'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-top.img'}, 'node_name': 'node0'}}
+{u'return': {}}
+
+bs->filename: json:{"backing": {"driver": "null-co"}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}}
+bs->backing_file: null-co://
+bs->backing->bs->filename: null-co://
+
+{'execute': 'blockdev-del', 'arguments': {'node_name': 'node0'}}
+{u'return': {}}
+{'execute': 'blockdev-del', 'arguments': {'node_name': 'null'}}
+{u'return': {}}
+{'execute': 'blockdev-add', 'arguments': {'backing': None, 'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-top.img'}, 'node_name': 'node0'}}
+{u'return': {}}
+
+bs->filename: json:{"backing": null, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-top.img"}}
+bs->backing_file: TEST_DIR/PID-base.img
+bs->backing: (none)
+
+{'execute': 'blockdev-add', 'arguments': {'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-base.img'}, 'node_name': 'original-backing'}}
+{u'return': {}}
+{'execute': 'blockdev-snapshot', 'arguments': {'node': 'original-backing', 'overlay': 'node0'}}
+{u'return': {}}
+
+bs->filename: TEST_DIR/PID-top.img
+bs->backing_file: TEST_DIR/PID-base.img
+bs->backing->bs->filename: TEST_DIR/PID-base.img
+
+{'execute': 'blockdev-del', 'arguments': {'node_name': 'node0'}}
+{u'return': {}}
+{'execute': 'blockdev-del', 'arguments': {'node_name': 'original-backing'}}
+{u'return': {}}
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 31f6e77dcb..9b28c47fbe 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -225,5 +225,6 @@
225 rw auto quick
226 auto quick
227 auto quick
+228 rw auto quick
229 auto quick
231 auto quick
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 09/31] block: Make path_combine() return the path
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (7 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 08/31] iotests: Add test for backing file overrides Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 10/31] block: bdrv_get_full_backing_filename_from_...'s ret. val Max Reitz
` (21 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Besides being safe for arbitrary path lengths, after some follow-up
patches all callers will want a freshly allocated buffer anyway.
In the meantime, path_combine_deprecated() is added which has the same
interface as path_combine() had before this patch. All callers to that
function will be converted in follow-up patches.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
---
include/block/block.h | 4 +-
block.c | 85 ++++++++++++++++++++++++-------------------
block/vmdk.c | 3 +-
3 files changed, 49 insertions(+), 43 deletions(-)
diff --git a/include/block/block.h b/include/block/block.h
index 47a9448d44..e5f01ebed0 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -491,9 +491,7 @@ void bdrv_get_full_backing_filename_from_filename(const char *backed,
int path_has_protocol(const char *path);
int path_is_absolute(const char *path);
-void path_combine(char *dest, int dest_size,
- const char *base_path,
- const char *filename);
+char *path_combine(const char *base_path, const char *filename);
int bdrv_readv_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
int bdrv_writev_vmstate(BlockDriverState *bs, QEMUIOVector *qiov, int64_t pos);
diff --git a/block.c b/block.c
index b9afdab601..d083b02b58 100644
--- a/block.c
+++ b/block.c
@@ -152,53 +152,62 @@ int path_is_absolute(const char *path)
#endif
}
-/* if filename is absolute, just copy it to dest. Otherwise, build a
+/* if filename is absolute, just return its duplicate. Otherwise, build a
path to it by considering it is relative to base_path. URL are
supported. */
-void path_combine(char *dest, int dest_size,
- const char *base_path,
- const char *filename)
+char *path_combine(const char *base_path, const char *filename)
{
+ const char *protocol_stripped = NULL;
const char *p, *p1;
+ char *result;
int len;
- if (dest_size <= 0)
- return;
if (path_is_absolute(filename)) {
- pstrcpy(dest, dest_size, filename);
- } else {
- const char *protocol_stripped = NULL;
+ return g_strdup(filename);
+ }
- if (path_has_protocol(base_path)) {
- protocol_stripped = strchr(base_path, ':');
- if (protocol_stripped) {
- protocol_stripped++;
- }
+ if (path_has_protocol(base_path)) {
+ protocol_stripped = strchr(base_path, ':');
+ if (protocol_stripped) {
+ protocol_stripped++;
}
- p = protocol_stripped ?: base_path;
+ }
+ p = protocol_stripped ?: base_path;
- p1 = strrchr(base_path, '/');
+ p1 = strrchr(base_path, '/');
#ifdef _WIN32
- {
- const char *p2;
- p2 = strrchr(base_path, '\\');
- if (!p1 || p2 > p1)
- p1 = p2;
+ {
+ const char *p2;
+ p2 = strrchr(base_path, '\\');
+ if (!p1 || p2 > p1) {
+ p1 = p2;
}
+ }
#endif
- if (p1)
- p1++;
- else
- p1 = base_path;
- if (p1 > p)
- p = p1;
- len = p - base_path;
- if (len > dest_size - 1)
- len = dest_size - 1;
- memcpy(dest, base_path, len);
- dest[len] = '\0';
- pstrcat(dest, dest_size, filename);
+ if (p1) {
+ p1++;
+ } else {
+ p1 = base_path;
+ }
+ if (p1 > p) {
+ p = p1;
}
+ len = p - base_path;
+
+ result = g_malloc(len + strlen(filename) + 1);
+ memcpy(result, base_path, len);
+ strcpy(result + len, filename);
+
+ return result;
+}
+
+static void path_combine_deprecated(char *dest, int dest_size,
+ const char *base_path,
+ const char *filename)
+{
+ char *combined = path_combine(base_path, filename);
+ pstrcpy(dest, dest_size, combined);
+ g_free(combined);
}
/*
@@ -297,7 +306,7 @@ void bdrv_get_full_backing_filename_from_filename(const char *backed,
error_setg(errp, "Cannot use relative backing file names for '%s'",
backed);
} else {
- path_combine(dest, sz, backed, backing);
+ path_combine_deprecated(dest, sz, backed, backing);
}
}
@@ -4373,8 +4382,8 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
} else {
/* If not an absolute filename path, make it relative to the current
* image's filename path */
- path_combine(filename_tmp, PATH_MAX, curr_bs->filename,
- backing_file);
+ path_combine_deprecated(filename_tmp, PATH_MAX, curr_bs->filename,
+ backing_file);
/* We are going to compare absolute pathnames */
if (!realpath(filename_tmp, filename_full)) {
@@ -4383,8 +4392,8 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
/* We need to make sure the backing filename we are comparing against
* is relative to the current image filename (or absolute) */
- path_combine(filename_tmp, PATH_MAX, curr_bs->filename,
- curr_bs->backing_file);
+ path_combine_deprecated(filename_tmp, PATH_MAX, curr_bs->filename,
+ curr_bs->backing_file);
if (!realpath(filename_tmp, backing_file_full)) {
continue;
diff --git a/block/vmdk.c b/block/vmdk.c
index c7484fddb6..3d3273e65b 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -873,8 +873,7 @@ static int vmdk_parse_extents(const char *desc, BlockDriverState *bs,
return -EINVAL;
}
- extent_path = g_malloc0(PATH_MAX);
- path_combine(extent_path, PATH_MAX, desc_file_path, fname);
+ extent_path = path_combine(desc_file_path, fname);
ret = snprintf(extent_opt_prefix, 32, "extents.%d", s->num_extents);
assert(ret < 32);
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 10/31] block: bdrv_get_full_backing_filename_from_...'s ret. val.
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (8 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 09/31] block: Make path_combine() return the path Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 11/31] block: bdrv_get_full_backing_filename's " Max Reitz
` (20 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Make bdrv_get_full_backing_filename_from_filename() return an allocated
string instead of placing the result in a caller-provided buffer.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
include/block/block.h | 7 +++---
block.c | 53 ++++++++++++++++++++++++++++++-------------
block/vmdk.c | 9 ++++----
qemu-img.c | 12 ++++------
4 files changed, 48 insertions(+), 33 deletions(-)
diff --git a/include/block/block.h b/include/block/block.h
index e5f01ebed0..bb238488c4 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -484,10 +484,9 @@ void bdrv_get_backing_filename(BlockDriverState *bs,
char *filename, int filename_size);
void bdrv_get_full_backing_filename(BlockDriverState *bs,
char *dest, size_t sz, Error **errp);
-void bdrv_get_full_backing_filename_from_filename(const char *backed,
- const char *backing,
- char *dest, size_t sz,
- Error **errp);
+char *bdrv_get_full_backing_filename_from_filename(const char *backed,
+ const char *backing,
+ Error **errp);
int path_has_protocol(const char *path);
int path_is_absolute(const char *path);
diff --git a/block.c b/block.c
index d083b02b58..d31c759091 100644
--- a/block.c
+++ b/block.c
@@ -293,20 +293,29 @@ int bdrv_set_read_only(BlockDriverState *bs, bool read_only, Error **errp)
return 0;
}
-void bdrv_get_full_backing_filename_from_filename(const char *backed,
- const char *backing,
- char *dest, size_t sz,
- Error **errp)
+/*
+ * If @backing is empty, this function returns NULL without setting
+ * @errp. In all other cases, NULL will only be returned with @errp
+ * set.
+ *
+ * Therefore, a return value of NULL without @errp set means that
+ * there is no backing file; if @errp is set, there is one but its
+ * absolute filename cannot be generated.
+ */
+char *bdrv_get_full_backing_filename_from_filename(const char *backed,
+ const char *backing,
+ Error **errp)
{
- if (backing[0] == '\0' || path_has_protocol(backing) ||
- path_is_absolute(backing))
- {
- pstrcpy(dest, sz, backing);
+ if (backing[0] == '\0') {
+ return NULL;
+ } else if (path_has_protocol(backing) || path_is_absolute(backing)) {
+ return g_strdup(backing);
} else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) {
error_setg(errp, "Cannot use relative backing file names for '%s'",
backed);
+ return NULL;
} else {
- path_combine_deprecated(dest, sz, backed, backing);
+ return path_combine(backed, backing);
}
}
@@ -314,12 +323,24 @@ void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz,
Error **errp)
{
char *backed;
+ char *full_name;
+ Error *local_error = NULL;
bdrv_refresh_filename(bs);
backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename;
- bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file,
- dest, sz, errp);
+
+ full_name = bdrv_get_full_backing_filename_from_filename(backed,
+ bs->backing_file,
+ &local_error);
+ if (full_name) {
+ pstrcpy(dest, sz, full_name);
+ g_free(full_name);
+ } else if (local_error) {
+ error_propagate(errp, local_error);
+ } else if (sz > 0) {
+ *dest = '\0';
+ }
}
void bdrv_register(BlockDriver *bdrv)
@@ -4871,17 +4892,17 @@ void bdrv_img_create(const char *filename, const char *fmt,
size = qemu_opt_get_size(opts, BLOCK_OPT_SIZE, img_size);
if (backing_file && !(flags & BDRV_O_NO_BACKING)) {
BlockDriverState *bs;
- char *full_backing = g_new0(char, PATH_MAX);
+ char *full_backing;
int back_flags;
QDict *backing_options = NULL;
- bdrv_get_full_backing_filename_from_filename(filename, backing_file,
- full_backing, PATH_MAX,
- &local_err);
+ full_backing =
+ bdrv_get_full_backing_filename_from_filename(filename, backing_file,
+ &local_err);
if (local_err) {
- g_free(full_backing);
goto out;
}
+ assert(full_backing);
/* backing files always opened read-only */
back_flags = flags;
diff --git a/block/vmdk.c b/block/vmdk.c
index 3d3273e65b..b3fc3b9e12 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -2049,16 +2049,15 @@ static int coroutine_fn vmdk_co_create_opts(const char *filename, QemuOpts *opts
}
if (backing_file) {
BlockBackend *blk;
- char *full_backing = g_new0(char, PATH_MAX);
- bdrv_get_full_backing_filename_from_filename(filename, backing_file,
- full_backing, PATH_MAX,
- &local_err);
+ char *full_backing =
+ bdrv_get_full_backing_filename_from_filename(filename, backing_file,
+ &local_err);
if (local_err) {
- g_free(full_backing);
error_propagate(errp, local_err);
ret = -ENOENT;
goto exit;
}
+ assert(full_backing);
blk = blk_new_open(full_backing, NULL, NULL,
BDRV_O_NO_BACKING, errp);
diff --git a/qemu-img.c b/qemu-img.c
index b12f4cd19b..22c9abe411 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -3327,18 +3327,14 @@ static int img_rebase(int argc, char **argv)
overlay_filename = bs->exact_filename[0] ? bs->exact_filename
: bs->filename;
- out_real_path = g_malloc(PATH_MAX);
-
- bdrv_get_full_backing_filename_from_filename(overlay_filename,
- out_baseimg,
- out_real_path,
- PATH_MAX,
- &local_err);
+ out_real_path =
+ bdrv_get_full_backing_filename_from_filename(overlay_filename,
+ out_baseimg,
+ &local_err);
if (local_err) {
error_reportf_err(local_err,
"Could not resolve backing filename: ");
ret = -1;
- g_free(out_real_path);
goto out;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 11/31] block: bdrv_get_full_backing_filename's ret. val.
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (9 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 10/31] block: bdrv_get_full_backing_filename_from_...'s ret. val Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 12/31] block: Add bdrv_make_absolute_filename() Max Reitz
` (19 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Make bdrv_get_full_backing_filename() return an allocated string instead
of placing the result in a caller-provided buffer.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
include/block/block.h | 3 +--
block.c | 48 +++++++++++++++----------------------------
block/qapi.c | 12 ++---------
3 files changed, 20 insertions(+), 43 deletions(-)
diff --git a/include/block/block.h b/include/block/block.h
index bb238488c4..ac149abca4 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -482,8 +482,7 @@ void bdrv_round_to_clusters(BlockDriverState *bs,
void bdrv_get_backing_filename(BlockDriverState *bs,
char *filename, int filename_size);
-void bdrv_get_full_backing_filename(BlockDriverState *bs,
- char *dest, size_t sz, Error **errp);
+char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp);
char *bdrv_get_full_backing_filename_from_filename(const char *backed,
const char *backing,
Error **errp);
diff --git a/block.c b/block.c
index d31c759091..3b5896083c 100644
--- a/block.c
+++ b/block.c
@@ -319,28 +319,16 @@ char *bdrv_get_full_backing_filename_from_filename(const char *backed,
}
}
-void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz,
- Error **errp)
+char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp)
{
char *backed;
- char *full_name;
- Error *local_error = NULL;
bdrv_refresh_filename(bs);
backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename;
-
- full_name = bdrv_get_full_backing_filename_from_filename(backed,
- bs->backing_file,
- &local_error);
- if (full_name) {
- pstrcpy(dest, sz, full_name);
- g_free(full_name);
- } else if (local_error) {
- error_propagate(errp, local_error);
- } else if (sz > 0) {
- *dest = '\0';
- }
+ return bdrv_get_full_backing_filename_from_filename(backed,
+ bs->backing_file,
+ errp);
}
void bdrv_register(BlockDriver *bdrv)
@@ -2307,7 +2295,7 @@ out:
int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
const char *bdref_key, Error **errp)
{
- char *backing_filename = g_malloc0(PATH_MAX);
+ char *backing_filename = NULL;
char *bdref_key_dot;
const char *reference = NULL;
int ret = 0;
@@ -2342,7 +2330,7 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
*/
reference = qdict_get_try_str(parent_options, bdref_key);
if (reference || qdict_haskey(options, "file.filename")) {
- backing_filename[0] = '\0';
+ /* keep backing_filename NULL */
} else if (bs->backing_file[0] == '\0' && qdict_size(options) == 0) {
qobject_unref(options);
goto free_exit;
@@ -2357,8 +2345,7 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
implicit_backing = !strcmp(bs->auto_backing_file, bs->backing_file);
}
- bdrv_get_full_backing_filename(bs, backing_filename, PATH_MAX,
- &local_err);
+ backing_filename = bdrv_get_full_backing_filename(bs, &local_err);
if (local_err) {
ret = -EINVAL;
error_propagate(errp, local_err);
@@ -2379,9 +2366,8 @@ int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options,
qdict_put_str(options, "driver", bs->backing_format);
}
- backing_hd = bdrv_open_inherit(*backing_filename ? backing_filename : NULL,
- reference, options, 0, bs, &child_backing,
- errp);
+ backing_hd = bdrv_open_inherit(backing_filename, reference, options, 0, bs,
+ &child_backing, errp);
if (!backing_hd) {
bs->open_flags |= BDRV_O_NO_BACKING;
error_prepend(errp, "Could not open backing file: ");
@@ -4364,7 +4350,6 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
int is_protocol = 0;
BlockDriverState *curr_bs = NULL;
BlockDriverState *retval = NULL;
- Error *local_error = NULL;
if (!bs || !bs->drv || !backing_file) {
return NULL;
@@ -4384,21 +4369,22 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
/* If either of the filename paths is actually a protocol, then
* compare unmodified paths; otherwise make paths relative */
if (is_protocol || path_has_protocol(curr_bs->backing_file)) {
+ char *backing_file_full_ret;
+
if (strcmp(backing_file, curr_bs->backing_file) == 0) {
retval = curr_bs->backing->bs;
break;
}
/* Also check against the full backing filename for the image */
- bdrv_get_full_backing_filename(curr_bs, backing_file_full, PATH_MAX,
- &local_error);
- if (local_error == NULL) {
- if (strcmp(backing_file, backing_file_full) == 0) {
+ backing_file_full_ret = bdrv_get_full_backing_filename(curr_bs,
+ NULL);
+ if (backing_file_full_ret) {
+ bool equal = strcmp(backing_file, backing_file_full_ret) == 0;
+ g_free(backing_file_full_ret);
+ if (equal) {
retval = curr_bs->backing->bs;
break;
}
- } else {
- error_free(local_error);
- local_error = NULL;
}
} else {
/* If not an absolute filename path, make it relative to the current
diff --git a/block/qapi.c b/block/qapi.c
index 743136b84e..287e38e9de 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -291,18 +291,10 @@ void bdrv_query_image_info(BlockDriverState *bs,
backing_filename = bs->backing_file;
if (backing_filename[0] != '\0') {
- char *backing_filename2 = g_malloc0(PATH_MAX);
+ char *backing_filename2;
info->backing_filename = g_strdup(backing_filename);
info->has_backing_filename = true;
- bdrv_get_full_backing_filename(bs, backing_filename2, PATH_MAX, &err);
- if (err) {
- /* Can't reconstruct the full backing filename, so we must omit
- * this field and apply a Best Effort to this query. */
- g_free(backing_filename2);
- backing_filename2 = NULL;
- error_free(err);
- err = NULL;
- }
+ backing_filename2 = bdrv_get_full_backing_filename(bs, NULL);
/* Always report the full_backing_filename if present, even if it's the
* same as backing_filename. That they are same is useful info. */
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 12/31] block: Add bdrv_make_absolute_filename()
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (10 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 11/31] block: bdrv_get_full_backing_filename's " Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 13/31] block: Fix bdrv_find_backing_image() Max Reitz
` (18 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
This is a general function for making a filename that is relative to a
certain BDS absolute.
It calls bdrv_get_full_backing_filename_from_filename() for now, but
that will be changed in a follow-up patch.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block.c | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)
diff --git a/block.c b/block.c
index 3b5896083c..6a346f6e5e 100644
--- a/block.c
+++ b/block.c
@@ -319,16 +319,29 @@ char *bdrv_get_full_backing_filename_from_filename(const char *backed,
}
}
-char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp)
+/*
+ * If @filename is empty or NULL, this function returns NULL without
+ * setting @errp. In all other cases, NULL will only be returned with
+ * @errp set.
+ */
+static char *bdrv_make_absolute_filename(BlockDriverState *relative_to,
+ const char *filename, Error **errp)
{
- char *backed;
+ char *bs_filename;
- bdrv_refresh_filename(bs);
+ bdrv_refresh_filename(relative_to);
+
+ bs_filename = relative_to->exact_filename[0]
+ ? relative_to->exact_filename
+ : relative_to->filename;
- backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename;
- return bdrv_get_full_backing_filename_from_filename(backed,
- bs->backing_file,
- errp);
+ return bdrv_get_full_backing_filename_from_filename(bs_filename,
+ filename ?: "", errp);
+}
+
+char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp)
+{
+ return bdrv_make_absolute_filename(bs, bs->backing_file, errp);
}
void bdrv_register(BlockDriver *bdrv)
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 13/31] block: Fix bdrv_find_backing_image()
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (11 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 12/31] block: Add bdrv_make_absolute_filename() Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 14/31] block: Add bdrv_dirname() Max Reitz
` (17 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
bdrv_find_backing_image() should use bdrv_get_full_backing_filename() or
bdrv_make_absolute_filename() instead of trying to do what those
functions do by itself.
path_combine_deprecated() can now be dropped, so let's do that.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block.c | 33 ++++++++++-----------------------
1 file changed, 10 insertions(+), 23 deletions(-)
diff --git a/block.c b/block.c
index 6a346f6e5e..45acdfa2bb 100644
--- a/block.c
+++ b/block.c
@@ -201,15 +201,6 @@ char *path_combine(const char *base_path, const char *filename)
return result;
}
-static void path_combine_deprecated(char *dest, int dest_size,
- const char *base_path,
- const char *filename)
-{
- char *combined = path_combine(base_path, filename);
- pstrcpy(dest, dest_size, combined);
- g_free(combined);
-}
-
/*
* Helper function for bdrv_parse_filename() implementations to remove optional
* protocol prefixes (especially "file:") from a filename and for putting the
@@ -4370,13 +4361,9 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
filename_full = g_malloc(PATH_MAX);
backing_file_full = g_malloc(PATH_MAX);
- filename_tmp = g_malloc(PATH_MAX);
is_protocol = path_has_protocol(backing_file);
- /* This will recursively refresh everything in the backing chain */
- bdrv_refresh_filename(bs);
-
for (curr_bs = bs; curr_bs->backing; curr_bs = curr_bs->backing->bs) {
/* If either of the filename paths is actually a protocol, then
@@ -4402,22 +4389,23 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
} else {
/* If not an absolute filename path, make it relative to the current
* image's filename path */
- path_combine_deprecated(filename_tmp, PATH_MAX, curr_bs->filename,
- backing_file);
-
- /* We are going to compare absolute pathnames */
- if (!realpath(filename_tmp, filename_full)) {
+ filename_tmp = bdrv_make_absolute_filename(curr_bs, backing_file,
+ NULL);
+ /* We are going to compare canonicalized absolute pathnames */
+ if (!filename_tmp || !realpath(filename_tmp, filename_full)) {
+ g_free(filename_tmp);
continue;
}
+ g_free(filename_tmp);
/* We need to make sure the backing filename we are comparing against
* is relative to the current image filename (or absolute) */
- path_combine_deprecated(filename_tmp, PATH_MAX, curr_bs->filename,
- curr_bs->backing_file);
-
- if (!realpath(filename_tmp, backing_file_full)) {
+ filename_tmp = bdrv_get_full_backing_filename(curr_bs, NULL);
+ if (!filename_tmp || !realpath(filename_tmp, backing_file_full)) {
+ g_free(filename_tmp);
continue;
}
+ g_free(filename_tmp);
if (strcmp(backing_file_full, filename_full) == 0) {
retval = curr_bs->backing->bs;
@@ -4428,7 +4416,6 @@ BlockDriverState *bdrv_find_backing_image(BlockDriverState *bs,
g_free(filename_full);
g_free(backing_file_full);
- g_free(filename_tmp);
return retval;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 14/31] block: Add bdrv_dirname()
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (12 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 13/31] block: Fix bdrv_find_backing_image() Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 15/31] blkverify: Make bdrv_dirname() return NULL Max Reitz
` (16 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
This function may be implemented by block drivers to derive a directory
name from a BDS. Concatenating this g_free()-able string with a relative
filename must result in a valid (not necessarily existing) filename, so
this is a function that should generally be not implemented by format
drivers, because this is protocol-specific.
If a BDS's driver does not implement this function, bdrv_dirname() will
fall through to the BDS's file if it exists. If it does not, the
exact_filename field will be used to generate a directory name.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
include/block/block.h | 1 +
include/block/block_int.h | 7 +++++++
block.c | 27 +++++++++++++++++++++++++++
3 files changed, 35 insertions(+)
diff --git a/include/block/block.h b/include/block/block.h
index ac149abca4..c6ac72e778 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -486,6 +486,7 @@ char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp);
char *bdrv_get_full_backing_filename_from_filename(const char *backed,
const char *backing,
Error **errp);
+char *bdrv_dirname(BlockDriverState *bs, Error **errp);
int path_has_protocol(const char *path);
int path_is_absolute(const char *path);
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 385070f373..f448b90ee7 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -141,6 +141,13 @@ struct BlockDriver {
void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options);
+ /*
+ * Returns an allocated string which is the directory name of this BDS: It
+ * will be used to make relative filenames absolute by prepending this
+ * function's return value to them.
+ */
+ char *(*bdrv_dirname)(BlockDriverState *bs, Error **errp);
+
/* aio */
BlockAIOCB *(*bdrv_aio_preadv)(BlockDriverState *bs,
uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, int flags,
diff --git a/block.c b/block.c
index 45acdfa2bb..0e5edccd15 100644
--- a/block.c
+++ b/block.c
@@ -5403,6 +5403,33 @@ void bdrv_refresh_filename(BlockDriverState *bs)
}
}
+char *bdrv_dirname(BlockDriverState *bs, Error **errp)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (!drv) {
+ error_setg(errp, "Node '%s' is ejected", bs->node_name);
+ return NULL;
+ }
+
+ if (drv->bdrv_dirname) {
+ return drv->bdrv_dirname(bs, errp);
+ }
+
+ if (bs->file) {
+ return bdrv_dirname(bs->file->bs, errp);
+ }
+
+ bdrv_refresh_filename(bs);
+ if (bs->exact_filename[0] != '\0') {
+ return path_combine(bs->exact_filename, "");
+ }
+
+ error_setg(errp, "Cannot generate a base directory for %s nodes",
+ drv->format_name);
+ return NULL;
+}
+
/*
* Hot add/remove a BDS's child. So the user can take a child offline when
* it is broken and take a new child online
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 15/31] blkverify: Make bdrv_dirname() return NULL
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (13 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 14/31] block: Add bdrv_dirname() Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 16/31] quorum: " Max Reitz
` (15 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
blkverify's BDSs have a file BDS, but we do not want this to be
preferred over the raw node. There is no way to decide between the two
(and not really a reason to, either), so just return NULL in blkverify's
implementation of bdrv_dirname().
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block/blkverify.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/block/blkverify.c b/block/blkverify.c
index 035d77b64a..3c7d4c8729 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -313,6 +313,15 @@ static void blkverify_refresh_filename(BlockDriverState *bs, QDict *options)
}
}
+static char *blkverify_dirname(BlockDriverState *bs, Error **errp)
+{
+ /* In general, there are two BDSs with different dirnames below this one;
+ * so there is no unique dirname we could return (unless both are equal by
+ * chance). Therefore, to be consistent, just always return NULL. */
+ error_setg(errp, "Cannot generate a base directory for blkverify nodes");
+ return NULL;
+}
+
static BlockDriver bdrv_blkverify = {
.format_name = "blkverify",
.protocol_name = "blkverify",
@@ -324,6 +333,7 @@ static BlockDriver bdrv_blkverify = {
.bdrv_child_perm = bdrv_filter_default_perms,
.bdrv_getlength = blkverify_getlength,
.bdrv_refresh_filename = blkverify_refresh_filename,
+ .bdrv_dirname = blkverify_dirname,
.bdrv_co_preadv = blkverify_co_preadv,
.bdrv_co_pwritev = blkverify_co_pwritev,
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 16/31] quorum: Make bdrv_dirname() return NULL
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (14 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 15/31] blkverify: Make bdrv_dirname() return NULL Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 17/31] block/nbd: " Max Reitz
` (14 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
While the common implementation for bdrv_dirname() should return NULL
for quorum BDSs already (because they do not have a file node and their
exact_filename field should be empty), there is no reason not to make
that explicit.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block/quorum.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/block/quorum.c b/block/quorum.c
index b14e9c6ec6..f831f84fd1 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -1101,6 +1101,16 @@ static void quorum_refresh_filename(BlockDriverState *bs, QDict *options)
bs->full_open_options = opts;
}
+static char *quorum_dirname(BlockDriverState *bs, Error **errp)
+{
+ /* In general, there are multiple BDSs with different dirnames below this
+ * one; so there is no unique dirname we could return (unless all are equal
+ * by chance, or there is only one). Therefore, to be consistent, just
+ * always return NULL. */
+ error_setg(errp, "Cannot generate a base directory for quorum nodes");
+ return NULL;
+}
+
static BlockDriver bdrv_quorum = {
.format_name = "quorum",
@@ -1109,6 +1119,7 @@ static BlockDriver bdrv_quorum = {
.bdrv_open = quorum_open,
.bdrv_close = quorum_close,
.bdrv_refresh_filename = quorum_refresh_filename,
+ .bdrv_dirname = quorum_dirname,
.bdrv_co_flush_to_disk = quorum_co_flush,
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 17/31] block/nbd: Make bdrv_dirname() return NULL
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (15 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 16/31] quorum: " Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 18/31] block/nfs: Implement bdrv_dirname() Max Reitz
` (13 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
The generic bdrv_dirname() implementation would be able to generate some
form of directory name for many NBD nodes, but it would be always wrong.
Therefore, we have to explicitly make it an error (until NBD has some
form of specification for export paths, if it ever will).
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
block/nbd.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/block/nbd.c b/block/nbd.c
index e87699fb73..bca127c8f5 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -564,6 +564,16 @@ static void nbd_refresh_filename(BlockDriverState *bs, QDict *options)
bs->full_open_options = opts;
}
+static char *nbd_dirname(BlockDriverState *bs, Error **errp)
+{
+ /* The generic bdrv_dirname() implementation is able to work out some
+ * directory name for NBD nodes, but that would be wrong. So far there is no
+ * specification for how "export paths" would work, so NBD does not have
+ * directory names. */
+ error_setg(errp, "Cannot generate a base directory for NBD nodes");
+ return NULL;
+}
+
static BlockDriver bdrv_nbd = {
.format_name = "nbd",
.protocol_name = "nbd",
@@ -582,6 +592,7 @@ static BlockDriver bdrv_nbd = {
.bdrv_attach_aio_context = nbd_attach_aio_context,
.bdrv_refresh_filename = nbd_refresh_filename,
.bdrv_co_block_status = nbd_client_co_block_status,
+ .bdrv_dirname = nbd_dirname,
};
static BlockDriver bdrv_nbd_tcp = {
@@ -602,6 +613,7 @@ static BlockDriver bdrv_nbd_tcp = {
.bdrv_attach_aio_context = nbd_attach_aio_context,
.bdrv_refresh_filename = nbd_refresh_filename,
.bdrv_co_block_status = nbd_client_co_block_status,
+ .bdrv_dirname = nbd_dirname,
};
static BlockDriver bdrv_nbd_unix = {
@@ -622,6 +634,7 @@ static BlockDriver bdrv_nbd_unix = {
.bdrv_attach_aio_context = nbd_attach_aio_context,
.bdrv_refresh_filename = nbd_refresh_filename,
.bdrv_co_block_status = nbd_client_co_block_status,
+ .bdrv_dirname = nbd_dirname,
};
static void bdrv_nbd_init(void)
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 18/31] block/nfs: Implement bdrv_dirname()
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (16 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 17/31] block/nbd: " Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 19/31] block: Use bdrv_dirname() for relative filenames Max Reitz
` (12 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
While the basic idea is obvious and could be handled by the default
bdrv_dirname() implementation, we cannot generate a directory name if
the gid or uid are set, so we have to explicitly return NULL in those
cases.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block/nfs.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/block/nfs.c b/block/nfs.c
index eab1a2c408..19ee07c321 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -855,6 +855,20 @@ static void nfs_refresh_filename(BlockDriverState *bs, QDict *options)
bs->full_open_options = opts;
}
+static char *nfs_dirname(BlockDriverState *bs, Error **errp)
+{
+ NFSClient *client = bs->opaque;
+
+ if (client->uid || client->gid) {
+ bdrv_refresh_filename(bs);
+ error_setg(errp, "Cannot generate a base directory for NFS node '%s'",
+ bs->filename);
+ return NULL;
+ }
+
+ return g_strdup_printf("nfs://%s%s/", client->server->host, client->path);
+}
+
#ifdef LIBNFS_FEATURE_PAGECACHE
static void coroutine_fn nfs_co_invalidate_cache(BlockDriverState *bs,
Error **errp)
@@ -889,6 +903,7 @@ static BlockDriver bdrv_nfs = {
.bdrv_detach_aio_context = nfs_detach_aio_context,
.bdrv_attach_aio_context = nfs_attach_aio_context,
.bdrv_refresh_filename = nfs_refresh_filename,
+ .bdrv_dirname = nfs_dirname,
#ifdef LIBNFS_FEATURE_PAGECACHE
.bdrv_co_invalidate_cache = nfs_co_invalidate_cache,
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 19/31] block: Use bdrv_dirname() for relative filenames
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (17 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 18/31] block/nfs: Implement bdrv_dirname() Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 20/31] iotests: Add quorum case to test 110 Max Reitz
` (11 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
bdrv_get_full_backing_filename_from_filename() breaks down when it comes
to JSON filenames. Using bdrv_dirname() as the basis is better because
since we have BDS, we can descend through the BDS tree to the protocol
layer, which gives us a greater probability of finding a non-JSON name;
also, bdrv_dirname() is more correct as it allows block drivers to
override the generation of that directory name in a protocol-specific
way.
We still need to keep bdrv_get_full_backing_filename_from_filename(),
though, because it has valid callers which need it during image creation
when no BDS is available yet.
This makes a test case in qemu-iotest 110, which was supposed to fail,
work. That is actually good, but we need to change the reference output
(and the comment in 110) accordingly.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block.c | 20 +++++++++++++-------
tests/qemu-iotests/110 | 3 ++-
tests/qemu-iotests/110.out | 2 +-
3 files changed, 16 insertions(+), 9 deletions(-)
diff --git a/block.c b/block.c
index 0e5edccd15..6b4fccecc9 100644
--- a/block.c
+++ b/block.c
@@ -318,16 +318,22 @@ char *bdrv_get_full_backing_filename_from_filename(const char *backed,
static char *bdrv_make_absolute_filename(BlockDriverState *relative_to,
const char *filename, Error **errp)
{
- char *bs_filename;
+ char *dir, *full_name;
- bdrv_refresh_filename(relative_to);
+ if (!filename || filename[0] == '\0') {
+ return NULL;
+ } else if (path_has_protocol(filename) || path_is_absolute(filename)) {
+ return g_strdup(filename);
+ }
- bs_filename = relative_to->exact_filename[0]
- ? relative_to->exact_filename
- : relative_to->filename;
+ dir = bdrv_dirname(relative_to, errp);
+ if (!dir) {
+ return NULL;
+ }
- return bdrv_get_full_backing_filename_from_filename(bs_filename,
- filename ?: "", errp);
+ full_name = g_strconcat(dir, filename, NULL);
+ g_free(dir);
+ return full_name;
}
char *bdrv_get_full_backing_filename(BlockDriverState *bs, Error **errp)
diff --git a/tests/qemu-iotests/110 b/tests/qemu-iotests/110
index 9de7369f3a..ba1b3c6c7d 100755
--- a/tests/qemu-iotests/110
+++ b/tests/qemu-iotests/110
@@ -61,7 +61,8 @@ echo '=== Non-reconstructable filename ==='
echo
# Across blkdebug without a config file, you cannot reconstruct filenames, so
-# qemu is incapable of knowing the directory of the top image
+# qemu is incapable of knowing the directory of the top image from the filename
+# alone. However, using bdrv_dirname(), it should still work.
TEST_IMG="json:{
'driver': '$IMGFMT',
'file': {
diff --git a/tests/qemu-iotests/110.out b/tests/qemu-iotests/110.out
index b3584ff87f..5370bc1d26 100644
--- a/tests/qemu-iotests/110.out
+++ b/tests/qemu-iotests/110.out
@@ -14,7 +14,7 @@ backing file: t.IMGFMT.base (actual path: TEST_DIR/t.IMGFMT.base)
image: json:{"driver": "IMGFMT", "file": {"set-state.0.event": "read_aio", "image": {"driver": "file", "filename": "TEST_DIR/t.IMGFMT"}, "driver": "blkdebug", "set-state.0.new_state": 42}}
file format: IMGFMT
virtual size: 64M (67108864 bytes)
-backing file: t.IMGFMT.base (cannot determine actual path)
+backing file: t.IMGFMT.base (actual path: TEST_DIR/t.IMGFMT.base)
=== Backing name is always relative to the backed image ===
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 20/31] iotests: Add quorum case to test 110
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (18 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 19/31] block: Use bdrv_dirname() for relative filenames Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 21/31] block: Add strong_runtime_opts to BlockDriver Max Reitz
` (10 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Test 110 tests relative backing filenames for complex BDS trees. Now
that the originally supposedly failing test passes, let us add a new
failing test: Quorum can never work automatically (without detecting
whether all child nodes have the same base directory, but that would be
rather inconsistent behavior).
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
tests/qemu-iotests/110 | 26 ++++++++++++++++++++++++++
tests/qemu-iotests/110.out | 7 +++++++
2 files changed, 33 insertions(+)
diff --git a/tests/qemu-iotests/110 b/tests/qemu-iotests/110
index ba1b3c6c7d..08976c8a61 100755
--- a/tests/qemu-iotests/110
+++ b/tests/qemu-iotests/110
@@ -30,6 +30,7 @@ status=1 # failure is the default!
_cleanup()
{
_cleanup_test_img
+ rm -f "$TEST_IMG.copy"
}
trap "_cleanup; exit \$status" 0 1 2 3 15
@@ -87,6 +88,31 @@ echo
# omit the image size; it should work anyway
_make_test_img -b "$TEST_IMG_REL.base"
+echo
+echo '=== Nodes without a common directory ==='
+echo
+
+cp "$TEST_IMG" "$TEST_IMG.copy"
+
+# Should inform us that the actual path of the backing file cannot be determined
+TEST_IMG="json:{
+ 'driver': '$IMGFMT',
+ 'file': {
+ 'driver': 'quorum',
+ 'vote-threshold': 1,
+ 'children': [
+ {
+ 'driver': 'file',
+ 'filename': '$TEST_IMG'
+ },
+ {
+ 'driver': 'file',
+ 'filename': '$TEST_IMG.copy'
+ }
+ ]
+ }
+}" _img_info | _filter_img_info
+
# success, all done
echo '*** done'
diff --git a/tests/qemu-iotests/110.out b/tests/qemu-iotests/110.out
index 5370bc1d26..1d0b2475cc 100644
--- a/tests/qemu-iotests/110.out
+++ b/tests/qemu-iotests/110.out
@@ -19,4 +19,11 @@ backing file: t.IMGFMT.base (actual path: TEST_DIR/t.IMGFMT.base)
=== Backing name is always relative to the backed image ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=t.IMGFMT.base
+
+=== Nodes without a common directory ===
+
+image: json:{"driver": "IMGFMT", "file": {"children": [{"driver": "file", "filename": "TEST_DIR/t.IMGFMT"}, {"driver": "file", "filename": "TEST_DIR/t.IMGFMT.copy"}], "driver": "quorum", "blkverify": false, "rewrite-corrupted": false, "vote-threshold": 1}}
+file format: IMGFMT
+virtual size: 64M (67108864 bytes)
+backing file: t.IMGFMT.base (cannot determine actual path)
*** done
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 21/31] block: Add strong_runtime_opts to BlockDriver
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (19 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 20/31] iotests: Add quorum case to test 110 Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 22/31] block: Add BlockDriver.bdrv_gather_child_options Max Reitz
` (9 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
This new field can be set by block drivers to list the runtime options
they accept that may influence the contents of the respective BDS. As of
a follow-up patch, this list will be used by the common
bdrv_refresh_filename() implementation to decide which options to put
into BDS.full_open_options (and consequently whether a JSON filename has
to be created), thus freeing the drivers of having to implement that
logic themselves.
Additionally, this patch adds the field to all of the block drivers that
need it and sets it accordingly.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
include/block/block_int.h | 7 +++++++
block/blkdebug.c | 16 ++++++++++++++++
block/blklogwrites.c | 8 ++++++++
block/crypto.c | 8 ++++++++
block/curl.c | 21 +++++++++++++++++++++
block/gluster.c | 19 +++++++++++++++++++
block/iscsi.c | 18 ++++++++++++++++++
block/nbd.c | 14 ++++++++++++++
block/nfs.c | 11 +++++++++++
block/null.c | 9 +++++++++
block/nvme.c | 8 ++++++++
block/qcow.c | 7 +++++++
block/qcow2.c | 7 +++++++
block/quorum.c | 11 +++++++++++
block/raw-format.c | 10 +++++++++-
block/rbd.c | 14 ++++++++++++++
block/replication.c | 8 ++++++++
block/sheepdog.c | 12 ++++++++++++
block/ssh.c | 12 ++++++++++++
block/throttle.c | 7 +++++++
block/vpc.c | 7 +++++++
block/vvfat.c | 12 ++++++++++++
block/vxhs.c | 11 +++++++++++
23 files changed, 256 insertions(+), 1 deletion(-)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index f448b90ee7..7adcda9898 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -516,6 +516,13 @@ struct BlockDriver {
void (*bdrv_register_buf)(BlockDriverState *bs, void *host, size_t size);
void (*bdrv_unregister_buf)(BlockDriverState *bs, void *host);
QLIST_ENTRY(BlockDriver) list;
+
+ /* Pointer to a NULL-terminated array of names of strong options
+ * that can be specified for bdrv_open(). A strong option is one
+ * that changes the data of a BDS.
+ * If this pointer is NULL, the array is considered empty.
+ * "filename" and "driver" are always considered strong. */
+ const char *const *strong_runtime_opts;
};
typedef struct BlockLimits {
diff --git a/block/blkdebug.c b/block/blkdebug.c
index 0759452925..71b4275b98 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -888,6 +888,20 @@ static int blkdebug_reopen_prepare(BDRVReopenState *reopen_state,
return 0;
}
+static const char *const blkdebug_strong_runtime_opts[] = {
+ "config",
+ "inject-error.",
+ "set-state.",
+ "align",
+ "max-transfer",
+ "opt-write-zero",
+ "max-write-zero",
+ "opt-discard",
+ "max-discard",
+
+ NULL
+};
+
static BlockDriver bdrv_blkdebug = {
.format_name = "blkdebug",
.protocol_name = "blkdebug",
@@ -917,6 +931,8 @@ static BlockDriver bdrv_blkdebug = {
= blkdebug_debug_remove_breakpoint,
.bdrv_debug_resume = blkdebug_debug_resume,
.bdrv_debug_is_suspended = blkdebug_debug_is_suspended,
+
+ .strong_runtime_opts = blkdebug_strong_runtime_opts,
};
static void bdrv_blkdebug_init(void)
diff --git a/block/blklogwrites.c b/block/blklogwrites.c
index 8f1b589d54..1c8e200326 100644
--- a/block/blklogwrites.c
+++ b/block/blklogwrites.c
@@ -518,6 +518,13 @@ blk_log_writes_co_pdiscard(BlockDriverState *bs, int64_t offset, int count)
LOG_DISCARD_FLAG, false);
}
+static const char *const blk_log_writes_strong_runtime_opts[] = {
+ "log-append",
+ "log-sector-size",
+
+ NULL
+};
+
static BlockDriver bdrv_blk_log_writes = {
.format_name = "blklogwrites",
.instance_size = sizeof(BDRVBlkLogWritesState),
@@ -537,6 +544,7 @@ static BlockDriver bdrv_blk_log_writes = {
.bdrv_co_block_status = bdrv_co_block_status_from_file,
.is_filter = true,
+ .strong_runtime_opts = blk_log_writes_strong_runtime_opts,
};
static void bdrv_blk_log_writes_init(void)
diff --git a/block/crypto.c b/block/crypto.c
index 33ee01bebd..62b5d1c639 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -621,6 +621,12 @@ block_crypto_get_specific_info_luks(BlockDriverState *bs)
return spec_info;
}
+static const char *const block_crypto_strong_runtime_opts[] = {
+ BLOCK_CRYPTO_OPT_LUKS_KEY_SECRET,
+
+ NULL
+};
+
BlockDriver bdrv_crypto_luks = {
.format_name = "luks",
.instance_size = sizeof(BlockCrypto),
@@ -642,6 +648,8 @@ BlockDriver bdrv_crypto_luks = {
.bdrv_getlength = block_crypto_getlength,
.bdrv_get_info = block_crypto_get_info_luks,
.bdrv_get_specific_info = block_crypto_get_specific_info_luks,
+
+ .strong_runtime_opts = block_crypto_strong_runtime_opts,
};
static void block_crypto_init(void)
diff --git a/block/curl.c b/block/curl.c
index fabb2b4da7..dbbb72b5d7 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -960,6 +960,19 @@ static int64_t curl_getlength(BlockDriverState *bs)
return s->len;
}
+static const char *const curl_strong_runtime_opts[] = {
+ CURL_BLOCK_OPT_URL,
+ CURL_BLOCK_OPT_SSLVERIFY,
+ CURL_BLOCK_OPT_COOKIE,
+ CURL_BLOCK_OPT_COOKIE_SECRET,
+ CURL_BLOCK_OPT_USERNAME,
+ CURL_BLOCK_OPT_PASSWORD_SECRET,
+ CURL_BLOCK_OPT_PROXY_USERNAME,
+ CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET,
+
+ NULL
+};
+
static BlockDriver bdrv_http = {
.format_name = "http",
.protocol_name = "http",
@@ -974,6 +987,8 @@ static BlockDriver bdrv_http = {
.bdrv_detach_aio_context = curl_detach_aio_context,
.bdrv_attach_aio_context = curl_attach_aio_context,
+
+ .strong_runtime_opts = curl_strong_runtime_opts,
};
static BlockDriver bdrv_https = {
@@ -990,6 +1005,8 @@ static BlockDriver bdrv_https = {
.bdrv_detach_aio_context = curl_detach_aio_context,
.bdrv_attach_aio_context = curl_attach_aio_context,
+
+ .strong_runtime_opts = curl_strong_runtime_opts,
};
static BlockDriver bdrv_ftp = {
@@ -1006,6 +1023,8 @@ static BlockDriver bdrv_ftp = {
.bdrv_detach_aio_context = curl_detach_aio_context,
.bdrv_attach_aio_context = curl_attach_aio_context,
+
+ .strong_runtime_opts = curl_strong_runtime_opts,
};
static BlockDriver bdrv_ftps = {
@@ -1022,6 +1041,8 @@ static BlockDriver bdrv_ftps = {
.bdrv_detach_aio_context = curl_detach_aio_context,
.bdrv_attach_aio_context = curl_attach_aio_context,
+
+ .strong_runtime_opts = curl_strong_runtime_opts,
};
static void curl_block_init(void)
diff --git a/block/gluster.c b/block/gluster.c
index 4fd55a9cc5..9f3611f443 100644
--- a/block/gluster.c
+++ b/block/gluster.c
@@ -1487,6 +1487,21 @@ static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs,
}
+static const char *const gluster_strong_open_opts[] = {
+ GLUSTER_OPT_VOLUME,
+ GLUSTER_OPT_PATH,
+ GLUSTER_OPT_TYPE,
+ GLUSTER_OPT_SERVER_PATTERN,
+ GLUSTER_OPT_HOST,
+ GLUSTER_OPT_PORT,
+ GLUSTER_OPT_TO,
+ GLUSTER_OPT_IPV4,
+ GLUSTER_OPT_IPV6,
+ GLUSTER_OPT_SOCKET,
+
+ NULL
+};
+
static BlockDriver bdrv_gluster = {
.format_name = "gluster",
.protocol_name = "gluster",
@@ -1514,6 +1529,7 @@ static BlockDriver bdrv_gluster = {
#endif
.bdrv_co_block_status = qemu_gluster_co_block_status,
.create_opts = &qemu_gluster_create_opts,
+ .strong_runtime_opts = gluster_strong_open_opts,
};
static BlockDriver bdrv_gluster_tcp = {
@@ -1543,6 +1559,7 @@ static BlockDriver bdrv_gluster_tcp = {
#endif
.bdrv_co_block_status = qemu_gluster_co_block_status,
.create_opts = &qemu_gluster_create_opts,
+ .strong_runtime_opts = gluster_strong_open_opts,
};
static BlockDriver bdrv_gluster_unix = {
@@ -1572,6 +1589,7 @@ static BlockDriver bdrv_gluster_unix = {
#endif
.bdrv_co_block_status = qemu_gluster_co_block_status,
.create_opts = &qemu_gluster_create_opts,
+ .strong_runtime_opts = gluster_strong_open_opts,
};
/* rdma is deprecated (actually never supported for volfile fetch).
@@ -1607,6 +1625,7 @@ static BlockDriver bdrv_gluster_rdma = {
#endif
.bdrv_co_block_status = qemu_gluster_co_block_status,
.create_opts = &qemu_gluster_create_opts,
+ .strong_runtime_opts = gluster_strong_open_opts,
};
static void bdrv_gluster_init(void)
diff --git a/block/iscsi.c b/block/iscsi.c
index bb69faf34a..ecee7117ff 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -2421,6 +2421,20 @@ static QemuOptsList iscsi_create_opts = {
}
};
+static const char *const iscsi_strong_runtime_opts[] = {
+ "transport",
+ "portal",
+ "target",
+ "user",
+ "password",
+ "password-secret",
+ "lun",
+ "initiator-name",
+ "header-digest",
+
+ NULL
+};
+
static BlockDriver bdrv_iscsi = {
.format_name = "iscsi",
.protocol_name = "iscsi",
@@ -2455,6 +2469,8 @@ static BlockDriver bdrv_iscsi = {
.bdrv_detach_aio_context = iscsi_detach_aio_context,
.bdrv_attach_aio_context = iscsi_attach_aio_context,
+
+ .strong_runtime_opts = iscsi_strong_runtime_opts,
};
#if LIBISCSI_API_VERSION >= (20160603)
@@ -2492,6 +2508,8 @@ static BlockDriver bdrv_iser = {
.bdrv_detach_aio_context = iscsi_detach_aio_context,
.bdrv_attach_aio_context = iscsi_attach_aio_context,
+
+ .strong_runtime_opts = iscsi_strong_runtime_opts,
};
#endif
diff --git a/block/nbd.c b/block/nbd.c
index bca127c8f5..5b4e4cf1db 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -574,6 +574,17 @@ static char *nbd_dirname(BlockDriverState *bs, Error **errp)
return NULL;
}
+static const char *const nbd_strong_runtime_opts[] = {
+ "path",
+ "host",
+ "port",
+ "export",
+ "tls-creds",
+ "server.",
+
+ NULL
+};
+
static BlockDriver bdrv_nbd = {
.format_name = "nbd",
.protocol_name = "nbd",
@@ -593,6 +604,7 @@ static BlockDriver bdrv_nbd = {
.bdrv_refresh_filename = nbd_refresh_filename,
.bdrv_co_block_status = nbd_client_co_block_status,
.bdrv_dirname = nbd_dirname,
+ .strong_runtime_opts = nbd_strong_runtime_opts,
};
static BlockDriver bdrv_nbd_tcp = {
@@ -614,6 +626,7 @@ static BlockDriver bdrv_nbd_tcp = {
.bdrv_refresh_filename = nbd_refresh_filename,
.bdrv_co_block_status = nbd_client_co_block_status,
.bdrv_dirname = nbd_dirname,
+ .strong_runtime_opts = nbd_strong_runtime_opts,
};
static BlockDriver bdrv_nbd_unix = {
@@ -635,6 +648,7 @@ static BlockDriver bdrv_nbd_unix = {
.bdrv_refresh_filename = nbd_refresh_filename,
.bdrv_co_block_status = nbd_client_co_block_status,
.bdrv_dirname = nbd_dirname,
+ .strong_runtime_opts = nbd_strong_runtime_opts,
};
static void bdrv_nbd_init(void)
diff --git a/block/nfs.c b/block/nfs.c
index 19ee07c321..6985a44b89 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -878,6 +878,15 @@ static void coroutine_fn nfs_co_invalidate_cache(BlockDriverState *bs,
}
#endif
+static const char *nfs_strong_runtime_opts[] = {
+ "path",
+ "user",
+ "group",
+ "server.",
+
+ NULL
+};
+
static BlockDriver bdrv_nfs = {
.format_name = "nfs",
.protocol_name = "nfs",
@@ -905,6 +914,8 @@ static BlockDriver bdrv_nfs = {
.bdrv_refresh_filename = nfs_refresh_filename,
.bdrv_dirname = nfs_dirname,
+ .strong_runtime_opts = nfs_strong_runtime_opts,
+
#ifdef LIBNFS_FEATURE_PAGECACHE
.bdrv_co_invalidate_cache = nfs_co_invalidate_cache,
#endif
diff --git a/block/null.c b/block/null.c
index d442d3e901..858892f0c4 100644
--- a/block/null.c
+++ b/block/null.c
@@ -252,6 +252,13 @@ static void null_refresh_filename(BlockDriverState *bs, QDict *opts)
bs->full_open_options = qobject_ref(opts);
}
+static const char *const null_strong_runtime_opts[] = {
+ BLOCK_OPT_SIZE,
+ NULL_OPT_ZEROES,
+
+ NULL
+};
+
static BlockDriver bdrv_null_co = {
.format_name = "null-co",
.protocol_name = "null-co",
@@ -269,6 +276,7 @@ static BlockDriver bdrv_null_co = {
.bdrv_co_block_status = null_co_block_status,
.bdrv_refresh_filename = null_refresh_filename,
+ .strong_runtime_opts = null_strong_runtime_opts,
};
static BlockDriver bdrv_null_aio = {
@@ -288,6 +296,7 @@ static BlockDriver bdrv_null_aio = {
.bdrv_co_block_status = null_co_block_status,
.bdrv_refresh_filename = null_refresh_filename,
+ .strong_runtime_opts = null_strong_runtime_opts,
};
static void bdrv_null_init(void)
diff --git a/block/nvme.c b/block/nvme.c
index 781d77d6d2..48677dd39c 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -1141,6 +1141,13 @@ static void nvme_unregister_buf(BlockDriverState *bs, void *host)
qemu_vfio_dma_unmap(s->vfio, host);
}
+static const char *const nvme_strong_runtime_opts[] = {
+ NVME_BLOCK_OPT_DEVICE,
+ NVME_BLOCK_OPT_NAMESPACE,
+
+ NULL
+};
+
static BlockDriver bdrv_nvme = {
.format_name = "nvme",
.protocol_name = "nvme",
@@ -1158,6 +1165,7 @@ static BlockDriver bdrv_nvme = {
.bdrv_refresh_filename = nvme_refresh_filename,
.bdrv_refresh_limits = nvme_refresh_limits,
+ .strong_runtime_opts = nvme_strong_runtime_opts,
.bdrv_detach_aio_context = nvme_detach_aio_context,
.bdrv_attach_aio_context = nvme_attach_aio_context,
diff --git a/block/qcow.c b/block/qcow.c
index 20f610ec74..61c3c70b0a 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -1186,6 +1186,12 @@ static QemuOptsList qcow_create_opts = {
}
};
+static const char *const qcow_strong_runtime_opts[] = {
+ "encrypt." BLOCK_CRYPTO_OPT_QCOW_KEY_SECRET,
+
+ NULL
+};
+
static BlockDriver bdrv_qcow = {
.format_name = "qcow",
.instance_size = sizeof(BDRVQcowState),
@@ -1209,6 +1215,7 @@ static BlockDriver bdrv_qcow = {
.bdrv_get_info = qcow_get_info,
.create_opts = &qcow_create_opts,
+ .strong_runtime_opts = qcow_strong_runtime_opts,
};
static void bdrv_qcow_init(void)
diff --git a/block/qcow2.c b/block/qcow2.c
index 972eb8d8c4..7c147fd62d 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -4752,6 +4752,12 @@ static QemuOptsList qcow2_create_opts = {
}
};
+static const char *const qcow2_strong_runtime_opts[] = {
+ "encrypt." BLOCK_CRYPTO_OPT_QCOW_KEY_SECRET,
+
+ NULL
+};
+
BlockDriver bdrv_qcow2 = {
.format_name = "qcow2",
.instance_size = sizeof(BDRVQcow2State),
@@ -4800,6 +4806,7 @@ BlockDriver bdrv_qcow2 = {
.bdrv_inactivate = qcow2_inactivate,
.create_opts = &qcow2_create_opts,
+ .strong_runtime_opts = qcow2_strong_runtime_opts,
.bdrv_co_check = qcow2_co_check,
.bdrv_amend_options = qcow2_amend_options,
diff --git a/block/quorum.c b/block/quorum.c
index f831f84fd1..d42d27445e 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -1111,6 +1111,15 @@ static char *quorum_dirname(BlockDriverState *bs, Error **errp)
return NULL;
}
+static const char *const quorum_strong_runtime_opts[] = {
+ QUORUM_OPT_VOTE_THRESHOLD,
+ QUORUM_OPT_BLKVERIFY,
+ QUORUM_OPT_REWRITE,
+ QUORUM_OPT_READ_PATTERN,
+
+ NULL
+};
+
static BlockDriver bdrv_quorum = {
.format_name = "quorum",
@@ -1135,6 +1144,8 @@ static BlockDriver bdrv_quorum = {
.is_filter = true,
.bdrv_recurse_is_first_non_filter = quorum_recurse_is_first_non_filter,
+
+ .strong_runtime_opts = quorum_strong_runtime_opts,
};
static void bdrv_quorum_init(void)
diff --git a/block/raw-format.c b/block/raw-format.c
index d07bcdae62..e3e5ba2c8a 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -532,6 +532,13 @@ static int coroutine_fn raw_co_copy_range_to(BlockDriverState *bs,
read_flags, write_flags);
}
+static const char *const raw_strong_runtime_opts[] = {
+ "offset",
+ "size",
+
+ NULL
+};
+
BlockDriver bdrv_raw = {
.format_name = "raw",
.instance_size = sizeof(BDRVRawState),
@@ -561,7 +568,8 @@ BlockDriver bdrv_raw = {
.bdrv_lock_medium = &raw_lock_medium,
.bdrv_co_ioctl = &raw_co_ioctl,
.create_opts = &raw_create_opts,
- .bdrv_has_zero_init = &raw_has_zero_init
+ .bdrv_has_zero_init = &raw_has_zero_init,
+ .strong_runtime_opts = raw_strong_runtime_opts,
};
static void bdrv_raw_init(void)
diff --git a/block/rbd.c b/block/rbd.c
index 014c68d629..da8debbe98 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -1234,6 +1234,18 @@ static QemuOptsList qemu_rbd_create_opts = {
}
};
+static const char *const qemu_rbd_strong_runtime_opts[] = {
+ "pool",
+ "image",
+ "conf",
+ "snapshot",
+ "user",
+ "server.",
+ "password-secret",
+
+ NULL
+};
+
static BlockDriver bdrv_rbd = {
.format_name = "rbd",
.instance_size = sizeof(BDRVRBDState),
@@ -1271,6 +1283,8 @@ static BlockDriver bdrv_rbd = {
#ifdef LIBRBD_SUPPORTS_INVALIDATE
.bdrv_co_invalidate_cache = qemu_rbd_co_invalidate_cache,
#endif
+
+ .strong_runtime_opts = qemu_rbd_strong_runtime_opts,
};
static void bdrv_rbd_init(void)
diff --git a/block/replication.c b/block/replication.c
index d5e39be5eb..0bc24c0e12 100644
--- a/block/replication.c
+++ b/block/replication.c
@@ -703,6 +703,13 @@ static void replication_stop(ReplicationState *rs, bool failover, Error **errp)
aio_context_release(aio_context);
}
+static const char *const replication_strong_runtime_opts[] = {
+ REPLICATION_MODE,
+ REPLICATION_TOP_ID,
+
+ NULL
+};
+
BlockDriver bdrv_replication = {
.format_name = "replication",
.instance_size = sizeof(BDRVReplicationState),
@@ -719,6 +726,7 @@ BlockDriver bdrv_replication = {
.bdrv_recurse_is_first_non_filter = replication_recurse_is_first_non_filter,
.has_variable_length = true,
+ .strong_runtime_opts = replication_strong_runtime_opts,
};
static void bdrv_replication_init(void)
diff --git a/block/sheepdog.c b/block/sheepdog.c
index b229a664d9..3cc62d3d68 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -3216,6 +3216,15 @@ static QemuOptsList sd_create_opts = {
}
};
+static const char *const sd_strong_runtime_opts[] = {
+ "vdi",
+ "snap-id",
+ "tag",
+ "server.",
+
+ NULL
+};
+
static BlockDriver bdrv_sheepdog = {
.format_name = "sheepdog",
.protocol_name = "sheepdog",
@@ -3251,6 +3260,7 @@ static BlockDriver bdrv_sheepdog = {
.bdrv_attach_aio_context = sd_attach_aio_context,
.create_opts = &sd_create_opts,
+ .strong_runtime_opts = sd_strong_runtime_opts,
};
static BlockDriver bdrv_sheepdog_tcp = {
@@ -3288,6 +3298,7 @@ static BlockDriver bdrv_sheepdog_tcp = {
.bdrv_attach_aio_context = sd_attach_aio_context,
.create_opts = &sd_create_opts,
+ .strong_runtime_opts = sd_strong_runtime_opts,
};
static BlockDriver bdrv_sheepdog_unix = {
@@ -3325,6 +3336,7 @@ static BlockDriver bdrv_sheepdog_unix = {
.bdrv_attach_aio_context = sd_attach_aio_context,
.create_opts = &sd_create_opts,
+ .strong_runtime_opts = sd_strong_runtime_opts,
};
static void bdrv_sheepdog_init(void)
diff --git a/block/ssh.c b/block/ssh.c
index 7fbc27abdf..350ad463b2 100644
--- a/block/ssh.c
+++ b/block/ssh.c
@@ -1266,6 +1266,17 @@ static int coroutine_fn ssh_co_truncate(BlockDriverState *bs, int64_t offset,
return ssh_grow_file(s, offset, errp);
}
+static const char *const ssh_strong_runtime_opts[] = {
+ "host",
+ "port",
+ "path",
+ "user",
+ "host_key_check",
+ "server.",
+
+ NULL
+};
+
static BlockDriver bdrv_ssh = {
.format_name = "ssh",
.protocol_name = "ssh",
@@ -1282,6 +1293,7 @@ static BlockDriver bdrv_ssh = {
.bdrv_co_truncate = ssh_co_truncate,
.bdrv_co_flush_to_disk = ssh_co_flush,
.create_opts = &ssh_create_opts,
+ .strong_runtime_opts = ssh_strong_runtime_opts,
};
static void bdrv_ssh_init(void)
diff --git a/block/throttle.c b/block/throttle.c
index 636c9764aa..f64dcc27b9 100644
--- a/block/throttle.c
+++ b/block/throttle.c
@@ -227,6 +227,12 @@ static void coroutine_fn throttle_co_drain_end(BlockDriverState *bs)
atomic_dec(&tgm->io_limits_disabled);
}
+static const char *const throttle_strong_runtime_opts[] = {
+ QEMU_OPT_THROTTLE_GROUP_NAME,
+
+ NULL
+};
+
static BlockDriver bdrv_throttle = {
.format_name = "throttle",
.instance_size = sizeof(ThrottleGroupMember),
@@ -259,6 +265,7 @@ static BlockDriver bdrv_throttle = {
.bdrv_co_drain_end = throttle_co_drain_end,
.is_filter = true,
+ .strong_runtime_opts = throttle_strong_runtime_opts,
};
static void bdrv_throttle_init(void)
diff --git a/block/vpc.c b/block/vpc.c
index 717809cc24..b5d8f86422 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -1214,6 +1214,12 @@ static QemuOptsList vpc_create_opts = {
}
};
+static const char *const vpc_strong_runtime_opts[] = {
+ VPC_OPT_SIZE_CALC,
+
+ NULL
+};
+
static BlockDriver bdrv_vpc = {
.format_name = "vpc",
.instance_size = sizeof(BDRVVPCState),
@@ -1234,6 +1240,7 @@ static BlockDriver bdrv_vpc = {
.create_opts = &vpc_create_opts,
.bdrv_has_zero_init = vpc_has_zero_init,
+ .strong_runtime_opts = vpc_strong_runtime_opts,
};
static void bdrv_vpc_init(void)
diff --git a/block/vvfat.c b/block/vvfat.c
index f2e7d501cf..bcf0c4bb5a 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -3244,6 +3244,16 @@ static void vvfat_close(BlockDriverState *bs)
}
}
+static const char *const vvfat_strong_runtime_opts[] = {
+ "dir",
+ "fat-type",
+ "floppy",
+ "label",
+ "rw",
+
+ NULL
+};
+
static BlockDriver bdrv_vvfat = {
.format_name = "vvfat",
.protocol_name = "fat",
@@ -3258,6 +3268,8 @@ static BlockDriver bdrv_vvfat = {
.bdrv_co_preadv = vvfat_co_preadv,
.bdrv_co_pwritev = vvfat_co_pwritev,
.bdrv_co_block_status = vvfat_co_block_status,
+
+ .strong_runtime_opts = vvfat_strong_runtime_opts,
};
static void bdrv_vvfat_init(void)
diff --git a/block/vxhs.c b/block/vxhs.c
index 0cb0a007e9..2e18229ba4 100644
--- a/block/vxhs.c
+++ b/block/vxhs.c
@@ -556,6 +556,16 @@ static int64_t vxhs_getlength(BlockDriverState *bs)
return vdisk_size;
}
+static const char *const vxhs_strong_runtime_opts[] = {
+ VXHS_OPT_VDISK_ID,
+ "tls-creds",
+ VXHS_OPT_HOST,
+ VXHS_OPT_PORT,
+ VXHS_OPT_SERVER".",
+
+ NULL
+};
+
static BlockDriver bdrv_vxhs = {
.format_name = "vxhs",
.protocol_name = "vxhs",
@@ -567,6 +577,7 @@ static BlockDriver bdrv_vxhs = {
.bdrv_getlength = vxhs_getlength,
.bdrv_aio_preadv = vxhs_aio_preadv,
.bdrv_aio_pwritev = vxhs_aio_pwritev,
+ .strong_runtime_opts = vxhs_strong_runtime_opts,
};
static void bdrv_vxhs_init(void)
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 22/31] block: Add BlockDriver.bdrv_gather_child_options
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (20 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 21/31] block: Add strong_runtime_opts to BlockDriver Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 23/31] block: Generically refresh runtime options Max Reitz
` (8 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Some follow-up patches will rework the way bs->full_open_options is
refreshed in bdrv_refresh_filename(). The new implementation will remove
the need for the block drivers' bdrv_refresh_filename() implementations
to set bs->full_open_options; instead, it will be generic and use static
information from each block driver.
However, by implementing bdrv_gather_child_options(), block drivers will
still be able to override the way the full_open_options of their
children are incorporated into their own.
We need to implement this function for VMDK because we have to prevent
the generic implementation from gathering the options of all children:
It is not possible to specify options for the extents through the
runtime options.
For quorum, the child names that would be used by the generic
implementation and the ones that we actually (currently) want to use
differ. See quorum_gather_child_options() for more information.
Note that both of these are cases which are not ideal: In case of VMDK
it would probably be nice to be able to specify options for all extents.
In case of quorum, the current runtime option structure is simply broken
and needs to be fixed (but that is left for another patch).
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
include/block/block_int.h | 24 +++++++++++++++++++++++
block/quorum.c | 40 +++++++++++++++++++++++++++++++++++++++
block/vmdk.c | 19 +++++++++++++++++++
3 files changed, 83 insertions(+)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 7adcda9898..183de0b832 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -141,6 +141,30 @@ struct BlockDriver {
void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options);
+ /*
+ * Gathers the open options for all children into @target.
+ * A simple format driver (without backing file support) might
+ * implement this function like this:
+ *
+ * QINCREF(bs->file->bs->full_open_options);
+ * qdict_put(target, "file", bs->file->bs->full_open_options);
+ *
+ * If not specified, the generic implementation will simply put
+ * all children's options under their respective name.
+ *
+ * @backing_overridden is true when bs->backing seems not to be
+ * the child that would result from opening bs->backing_file.
+ * Therefore, if it is true, the backing child's options should be
+ * gathered; otherwise, there is no need since the backing child
+ * is the one implied by the image header.
+ *
+ * Note that ideally this function would not be needed. Every
+ * block driver which implements it is probably doing something
+ * shady regarding its runtime option structure.
+ */
+ void (*bdrv_gather_child_options)(BlockDriverState *bs, QDict *target,
+ bool backing_overridden);
+
/*
* Returns an allocated string which is the directory name of this BDS: It
* will be used to make relative filenames absolute by prepending this
diff --git a/block/quorum.c b/block/quorum.c
index d42d27445e..644b173d53 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -1101,6 +1101,45 @@ static void quorum_refresh_filename(BlockDriverState *bs, QDict *options)
bs->full_open_options = opts;
}
+static void quorum_gather_child_options(BlockDriverState *bs, QDict *target,
+ bool backing_overridden)
+{
+ BDRVQuorumState *s = bs->opaque;
+ QList *children_list;
+ int i;
+
+ /*
+ * The generic implementation for gathering child options in
+ * bdrv_refresh_filename() would use the names of the children
+ * as specified for bdrv_open_child() or bdrv_attach_child(),
+ * which is "children.%u" with %u being a value
+ * (s->next_child_index) that is incremented each time a new child
+ * is added (and never decremented). Since children can be
+ * deleted at runtime, there may be gaps in that enumeration.
+ * When creating a new quorum BDS and specifying the children for
+ * it through runtime options, the enumeration used there may not
+ * have any gaps, though.
+ *
+ * Therefore, we have to create a new gap-less enumeration here
+ * (which we can achieve by simply putting all of the children's
+ * full_open_options into a QList).
+ *
+ * XXX: Note that there are issues with the current child option
+ * structure quorum uses (such as the fact that children do
+ * not really have unique permanent names). Therefore, this
+ * is going to have to change in the future and ideally we
+ * want quorum to be covered by the generic implementation.
+ */
+
+ children_list = qlist_new();
+ qdict_put(target, "children", children_list);
+
+ for (i = 0; i < s->num_children; i++) {
+ qlist_append(children_list,
+ qobject_ref(s->children[i]->bs->full_open_options));
+ }
+}
+
static char *quorum_dirname(BlockDriverState *bs, Error **errp)
{
/* In general, there are multiple BDSs with different dirnames below this
@@ -1128,6 +1167,7 @@ static BlockDriver bdrv_quorum = {
.bdrv_open = quorum_open,
.bdrv_close = quorum_close,
.bdrv_refresh_filename = quorum_refresh_filename,
+ .bdrv_gather_child_options = quorum_gather_child_options,
.bdrv_dirname = quorum_dirname,
.bdrv_co_flush_to_disk = quorum_co_flush,
diff --git a/block/vmdk.c b/block/vmdk.c
index b3fc3b9e12..0b3a19804d 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -27,6 +27,7 @@
#include "qapi/error.h"
#include "block/block_int.h"
#include "sysemu/block-backend.h"
+#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qerror.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
@@ -2377,6 +2378,23 @@ static int vmdk_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
return 0;
}
+static void vmdk_gather_child_options(BlockDriverState *bs, QDict *target,
+ bool backing_overridden)
+{
+ /* No children but file and backing can be explicitly specified (TODO) */
+ qdict_put(target, "file",
+ qobject_ref(bs->file->bs->full_open_options));
+
+ if (backing_overridden) {
+ if (bs->backing) {
+ qdict_put(target, "backing",
+ qobject_ref(bs->backing->bs->full_open_options));
+ } else {
+ qdict_put_null(target, "backing");
+ }
+ }
+}
+
static QemuOptsList vmdk_create_opts = {
.name = "vmdk-create-opts",
.head = QTAILQ_HEAD_INITIALIZER(vmdk_create_opts.head),
@@ -2447,6 +2465,7 @@ static BlockDriver bdrv_vmdk = {
.bdrv_get_specific_info = vmdk_get_specific_info,
.bdrv_refresh_limits = vmdk_refresh_limits,
.bdrv_get_info = vmdk_get_info,
+ .bdrv_gather_child_options = vmdk_gather_child_options,
.supports_backing = true,
.create_opts = &vmdk_create_opts,
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 23/31] block: Generically refresh runtime options
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (21 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 22/31] block: Add BlockDriver.bdrv_gather_child_options Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 24/31] block: Purify .bdrv_refresh_filename() Max Reitz
` (7 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Instead of having every block driver which implements
bdrv_refresh_filename() copy all of the strong runtime options over to
bs->full_open_options, implement this process generically in
bdrv_refresh_filename().
This patch only adds this new generic implementation, it does not remove
the old functionality. This is done in a follow-up patch.
With this patch, some superfluous information (that should never have
been there) may be removed from some JSON filenames, as can be seen in
the change to iotest 110's reference output.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block.c | 116 ++++++++++++++++++++++++++++++++++++-
tests/qemu-iotests/110.out | 2 +-
2 files changed, 116 insertions(+), 2 deletions(-)
diff --git a/block.c b/block.c
index 6b4fccecc9..761fadf5bc 100644
--- a/block.c
+++ b/block.c
@@ -5223,6 +5223,92 @@ out:
return to_replace_bs;
}
+/**
+ * Iterates through the list of runtime option keys that are said to
+ * be "strong" for a BDS. An option is called "strong" if it changes
+ * a BDS's data. For example, the null block driver's "size" and
+ * "read-zeroes" options are strong, but its "latency-ns" option is
+ * not.
+ *
+ * If a key returned by this function ends with a dot, all options
+ * starting with that prefix are strong.
+ */
+static const char *const *strong_options(BlockDriverState *bs,
+ const char *const *curopt)
+{
+ static const char *const global_options[] = {
+ "driver", "filename", NULL
+ };
+
+ if (!curopt) {
+ return &global_options[0];
+ }
+
+ curopt++;
+ if (curopt == &global_options[ARRAY_SIZE(global_options) - 1] && bs->drv) {
+ curopt = bs->drv->strong_runtime_opts;
+ }
+
+ return (curopt && *curopt) ? curopt : NULL;
+}
+
+/**
+ * Copies all strong runtime options from bs->options to the given
+ * QDict. The set of strong option keys is determined by invoking
+ * strong_options().
+ *
+ * Returns true iff any strong option was present in bs->options (and
+ * thus copied to the target QDict) with the exception of "filename"
+ * and "driver". The caller is expected to use this value to decide
+ * whether the existence of strong options prevents the generation of
+ * a plain filename.
+ */
+static bool append_strong_runtime_options(QDict *d, BlockDriverState *bs)
+{
+ bool found_any = false;
+ const char *const *option_name = NULL;
+
+ if (!bs->drv) {
+ return false;
+ }
+
+ while ((option_name = strong_options(bs, option_name))) {
+ bool option_given = false;
+
+ assert(strlen(*option_name) > 0);
+ if ((*option_name)[strlen(*option_name) - 1] != '.') {
+ QObject *entry = qdict_get(bs->options, *option_name);
+ if (!entry) {
+ continue;
+ }
+
+ qdict_put_obj(d, *option_name, qobject_ref(entry));
+ option_given = true;
+ } else {
+ const QDictEntry *entry;
+ for (entry = qdict_first(bs->options); entry;
+ entry = qdict_next(bs->options, entry))
+ {
+ if (strstart(qdict_entry_key(entry), *option_name, NULL)) {
+ qdict_put_obj(d, qdict_entry_key(entry),
+ qobject_ref(qdict_entry_value(entry)));
+ option_given = true;
+ }
+ }
+ }
+
+ /* While "driver" and "filename" need to be included in a JSON filename,
+ * their existence does not prohibit generation of a plain filename. */
+ if (!found_any && option_given &&
+ strcmp(*option_name, "driver") && strcmp(*option_name, "filename"))
+ {
+ found_any = true;
+ }
+ }
+
+ return found_any;
+}
+
static bool append_open_options(QDict *d, BlockDriverState *bs)
{
const QDictEntry *entry;
@@ -5399,9 +5485,37 @@ void bdrv_refresh_filename(BlockDriverState *bs)
bs->full_open_options = opts;
}
+ /* Gather the options QDict */
+ opts = qdict_new();
+ append_strong_runtime_options(opts, bs);
+
+ if (drv->bdrv_gather_child_options) {
+ /* Some block drivers may not want to present all of their children's
+ * options, or name them differently from BdrvChild.name */
+ drv->bdrv_gather_child_options(bs, opts, backing_overridden);
+ } else {
+ QLIST_FOREACH(child, &bs->children, next) {
+ if (child->role == &child_backing && !backing_overridden) {
+ /* We can skip the backing BDS if it has not been overridden */
+ continue;
+ }
+
+ qdict_put(opts, child->name,
+ qobject_ref(child->bs->full_open_options));
+ }
+
+ if (backing_overridden && !bs->backing) {
+ /* Force no backing file */
+ qdict_put_null(opts, "backing");
+ }
+ }
+
+ qobject_unref(bs->full_open_options);
+ bs->full_open_options = opts;
+
if (bs->exact_filename[0]) {
pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename);
- } else if (bs->full_open_options) {
+ } else {
QString *json = qobject_to_json(QOBJECT(bs->full_open_options));
snprintf(bs->filename, sizeof(bs->filename), "json:%s",
qstring_get_str(json));
diff --git a/tests/qemu-iotests/110.out b/tests/qemu-iotests/110.out
index 1d0b2475cc..46e6a60510 100644
--- a/tests/qemu-iotests/110.out
+++ b/tests/qemu-iotests/110.out
@@ -22,7 +22,7 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=t.IMGFMT.b
=== Nodes without a common directory ===
-image: json:{"driver": "IMGFMT", "file": {"children": [{"driver": "file", "filename": "TEST_DIR/t.IMGFMT"}, {"driver": "file", "filename": "TEST_DIR/t.IMGFMT.copy"}], "driver": "quorum", "blkverify": false, "rewrite-corrupted": false, "vote-threshold": 1}}
+image: json:{"driver": "IMGFMT", "file": {"children": [{"driver": "file", "filename": "TEST_DIR/t.IMGFMT"}, {"driver": "file", "filename": "TEST_DIR/t.IMGFMT.copy"}], "driver": "quorum", "vote-threshold": 1}}
file format: IMGFMT
virtual size: 64M (67108864 bytes)
backing file: t.IMGFMT.base (cannot determine actual path)
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 24/31] block: Purify .bdrv_refresh_filename()
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (22 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 23/31] block: Generically refresh runtime options Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-11 13:50 ` Alberto Garcia
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 25/31] block: Do not copy exact_filename from format file Max Reitz
` (6 subsequent siblings)
30 siblings, 1 reply; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Currently, BlockDriver.bdrv_refresh_filename() is supposed to both
refresh the filename (BDS.exact_filename) and set BDS.full_open_options.
Now that we have generic code in the central bdrv_refresh_filename() for
creating BDS.full_open_options, we can drop the latter part from all
BlockDriver.bdrv_refresh_filename() implementations.
This also means that we can drop all of the existing default code for
this from the global bdrv_refresh_filename() itself.
Furthermore, we now have to call BlockDriver.bdrv_refresh_filename()
after having set BDS.full_open_options, because the block driver's
implementation should now be allowed to depend on BDS.full_open_options
being set correctly.
Finally, with this patch we can drop the @options parameter from
BlockDriver.bdrv_refresh_filename(); also, add a comment on this
function's purpose in block/block_int.h while touching its interface.
This completely obsoletes blklogwrite's implementation of
.bdrv_refresh_filename().
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
include/block/block_int.h | 6 +-
block.c | 131 +++++++-------------------------------
block/blkdebug.c | 54 ++++++----------
block/blklogwrites.c | 23 -------
block/blkverify.c | 16 +----
block/commit.c | 2 +-
block/mirror.c | 2 +-
block/nbd.c | 23 +------
block/nfs.c | 36 +----------
block/null.c | 22 ++++---
block/nvme.c | 22 ++++---
block/quorum.c | 30 ---------
12 files changed, 80 insertions(+), 287 deletions(-)
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 183de0b832..26a2af86c5 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -139,7 +139,11 @@ struct BlockDriver {
Error **errp);
int (*bdrv_make_empty)(BlockDriverState *bs);
- void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options);
+ /*
+ * Refreshes the bs->exact_filename field. If that is impossible,
+ * bs->exact_filename has to be left empty.
+ */
+ void (*bdrv_refresh_filename)(BlockDriverState *bs);
/*
* Gathers the open options for all children into @target.
diff --git a/block.c b/block.c
index 761fadf5bc..c919093a04 100644
--- a/block.c
+++ b/block.c
@@ -5309,33 +5309,6 @@ static bool append_strong_runtime_options(QDict *d, BlockDriverState *bs)
return found_any;
}
-static bool append_open_options(QDict *d, BlockDriverState *bs)
-{
- const QDictEntry *entry;
- QemuOptDesc *desc;
- bool found_any = false;
-
- for (entry = qdict_first(bs->options); entry;
- entry = qdict_next(bs->options, entry))
- {
- /* Exclude all non-driver-specific options */
- for (desc = bdrv_runtime_opts.desc; desc->name; desc++) {
- if (!strcmp(qdict_entry_key(entry), desc->name)) {
- break;
- }
- }
- if (desc->name) {
- continue;
- }
-
- qdict_put_obj(d, qdict_entry_key(entry),
- qobject_ref(qdict_entry_value(entry)));
- found_any = true;
- }
-
- return found_any;
-}
-
/* Note: This function may return false positives; it may return true
* even if opening the backing file specified by bs's image header
* would result in exactly bs->backing. */
@@ -5369,6 +5342,8 @@ void bdrv_refresh_filename(BlockDriverState *bs)
BdrvChild *child;
QDict *opts;
bool backing_overridden;
+ bool generate_json_filename; /* Whether our default implementation should
+ fill exact_filename (false) or not (true) */
if (!drv) {
return;
@@ -5404,90 +5379,10 @@ void bdrv_refresh_filename(BlockDriverState *bs)
backing_overridden = false;
}
- if (drv->bdrv_refresh_filename) {
- /* Obsolete information is of no use here, so drop the old file name
- * information before refreshing it */
- bs->exact_filename[0] = '\0';
- if (bs->full_open_options) {
- qobject_unref(bs->full_open_options);
- bs->full_open_options = NULL;
- }
-
- opts = qdict_new();
- append_open_options(opts, bs);
- drv->bdrv_refresh_filename(bs, opts);
- qobject_unref(opts);
- } else if (bs->file) {
- /* Try to reconstruct valid information from the underlying file */
- bool has_open_options;
-
- bs->exact_filename[0] = '\0';
- if (bs->full_open_options) {
- qobject_unref(bs->full_open_options);
- bs->full_open_options = NULL;
- }
-
- opts = qdict_new();
- has_open_options = append_open_options(opts, bs);
- has_open_options |= backing_overridden;
-
- /* If no specific options have been given for this BDS, the filename of
- * the underlying file should suffice for this one as well */
- if (bs->file->bs->exact_filename[0] && !has_open_options) {
- strcpy(bs->exact_filename, bs->file->bs->exact_filename);
- }
- /* Reconstructing the full options QDict is simple for most format block
- * drivers, as long as the full options are known for the underlying
- * file BDS. The full options QDict of that file BDS should somehow
- * contain a representation of the filename, therefore the following
- * suffices without querying the (exact_)filename of this BDS. */
- if (bs->file->bs->full_open_options &&
- (!bs->backing || bs->backing->bs->full_open_options))
- {
- qdict_put_str(opts, "driver", drv->format_name);
- qdict_put(opts, "file",
- qobject_ref(bs->file->bs->full_open_options));
-
- if (bs->backing) {
- qdict_put(opts, "backing",
- qobject_ref(bs->backing->bs->full_open_options));
- } else if (backing_overridden) {
- qdict_put_null(opts, "backing");
- }
-
- bs->full_open_options = opts;
- } else {
- qobject_unref(opts);
- }
- } else if (!bs->full_open_options && qdict_size(bs->options)) {
- /* There is no underlying file BDS (at least referenced by BDS.file),
- * so the full options QDict should be equal to the options given
- * specifically for this block device when it was opened (plus the
- * driver specification).
- * Because those options don't change, there is no need to update
- * full_open_options when it's already set. */
-
- opts = qdict_new();
- append_open_options(opts, bs);
- qdict_put_str(opts, "driver", drv->format_name);
-
- if (bs->exact_filename[0]) {
- /* This may not work for all block protocol drivers (some may
- * require this filename to be parsed), but we have to find some
- * default solution here, so just include it. If some block driver
- * does not support pure options without any filename at all or
- * needs some special format of the options QDict, it needs to
- * implement the driver-specific bdrv_refresh_filename() function.
- */
- qdict_put_str(opts, "filename", bs->exact_filename);
- }
-
- bs->full_open_options = opts;
- }
-
/* Gather the options QDict */
opts = qdict_new();
- append_strong_runtime_options(opts, bs);
+ generate_json_filename = append_strong_runtime_options(opts, bs);
+ generate_json_filename |= backing_overridden;
if (drv->bdrv_gather_child_options) {
/* Some block drivers may not want to present all of their children's
@@ -5513,6 +5408,24 @@ void bdrv_refresh_filename(BlockDriverState *bs)
qobject_unref(bs->full_open_options);
bs->full_open_options = opts;
+ if (drv->bdrv_refresh_filename) {
+ /* Obsolete information is of no use here, so drop the old file name
+ * information before refreshing it */
+ bs->exact_filename[0] = '\0';
+
+ drv->bdrv_refresh_filename(bs);
+ } else if (bs->file) {
+ /* Try to reconstruct valid information from the underlying file */
+
+ bs->exact_filename[0] = '\0';
+
+ /* If no specific options have been given for this BDS, the filename of
+ * the underlying file should suffice for this one as well */
+ if (bs->file->bs->exact_filename[0] && !generate_json_filename) {
+ strcpy(bs->exact_filename, bs->file->bs->exact_filename);
+ }
+ }
+
if (bs->exact_filename[0]) {
pstrcpy(bs->filename, sizeof(bs->filename), bs->exact_filename);
} else {
diff --git a/block/blkdebug.c b/block/blkdebug.c
index 71b4275b98..1ea835c2b9 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -811,51 +811,37 @@ static int64_t blkdebug_getlength(BlockDriverState *bs)
return bdrv_getlength(bs->file->bs);
}
-static void blkdebug_refresh_filename(BlockDriverState *bs, QDict *options)
+static void blkdebug_refresh_filename(BlockDriverState *bs)
{
BDRVBlkdebugState *s = bs->opaque;
- QDict *opts;
const QDictEntry *e;
- bool force_json = false;
-
- for (e = qdict_first(options); e; e = qdict_next(options, e)) {
- if (strcmp(qdict_entry_key(e), "config") &&
- strcmp(qdict_entry_key(e), "x-image"))
- {
- force_json = true;
- break;
- }
- }
+ int ret;
- if (force_json && !bs->file->bs->full_open_options) {
- /* The config file cannot be recreated, so creating a plain filename
- * is impossible */
+ if (!bs->file->bs->exact_filename[0]) {
return;
}
- if (!force_json && bs->file->bs->exact_filename[0]) {
- int ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
- "blkdebug:%s:%s", s->config_file ?: "",
- bs->file->bs->exact_filename);
- if (ret >= sizeof(bs->exact_filename)) {
- /* An overflow makes the filename unusable, so do not report any */
- bs->exact_filename[0] = 0;
+ for (e = qdict_first(bs->full_open_options); e;
+ e = qdict_next(bs->full_open_options, e))
+ {
+ /* Real child options are under "image", but "x-image" may
+ * contain a filename */
+ if (strcmp(qdict_entry_key(e), "config") &&
+ strcmp(qdict_entry_key(e), "image") &&
+ strcmp(qdict_entry_key(e), "x-image") &&
+ strcmp(qdict_entry_key(e), "driver"))
+ {
+ return;
}
}
- opts = qdict_new();
- qdict_put_str(opts, "driver", "blkdebug");
-
- qdict_put(opts, "image", qobject_ref(bs->file->bs->full_open_options));
-
- for (e = qdict_first(options); e; e = qdict_next(options, e)) {
- if (strcmp(qdict_entry_key(e), "x-image")) {
- qdict_put_obj(opts, qdict_entry_key(e),
- qobject_ref(qdict_entry_value(e)));
- }
+ ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
+ "blkdebug:%s:%s",
+ s->config_file ?: "", bs->file->bs->exact_filename);
+ if (ret >= sizeof(bs->exact_filename)) {
+ /* An overflow makes the filename unusable, so do not report any */
+ bs->exact_filename[0] = 0;
}
-
- bs->full_open_options = opts;
}
static void blkdebug_refresh_limits(BlockDriverState *bs, Error **errp)
diff --git a/block/blklogwrites.c b/block/blklogwrites.c
index 1c8e200326..eb2b4901a5 100644
--- a/block/blklogwrites.c
+++ b/block/blklogwrites.c
@@ -280,28 +280,6 @@ static int64_t blk_log_writes_getlength(BlockDriverState *bs)
return bdrv_getlength(bs->file->bs);
}
-static void blk_log_writes_refresh_filename(BlockDriverState *bs,
- QDict *options)
-{
- BDRVBlkLogWritesState *s = bs->opaque;
-
- if (bs->file->bs->full_open_options
- && s->log_file->bs->full_open_options)
- {
- QDict *opts = qdict_new();
- qdict_put_str(opts, "driver", "blklogwrites");
-
- qobject_ref(bs->file->bs->full_open_options);
- qdict_put_obj(opts, "file", QOBJECT(bs->file->bs->full_open_options));
- qobject_ref(s->log_file->bs->full_open_options);
- qdict_put_obj(opts, "log",
- QOBJECT(s->log_file->bs->full_open_options));
- qdict_put_int(opts, "log-sector-size", s->sectorsize);
-
- bs->full_open_options = opts;
- }
-}
-
static void blk_log_writes_child_perm(BlockDriverState *bs, BdrvChild *c,
const BdrvChildRole *role,
BlockReopenQueue *ro_q,
@@ -532,7 +510,6 @@ static BlockDriver bdrv_blk_log_writes = {
.bdrv_open = blk_log_writes_open,
.bdrv_close = blk_log_writes_close,
.bdrv_getlength = blk_log_writes_getlength,
- .bdrv_refresh_filename = blk_log_writes_refresh_filename,
.bdrv_child_perm = blk_log_writes_child_perm,
.bdrv_refresh_limits = blk_log_writes_refresh_limits,
diff --git a/block/blkverify.c b/block/blkverify.c
index 3c7d4c8729..3ff77ff49a 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -281,24 +281,10 @@ static bool blkverify_recurse_is_first_non_filter(BlockDriverState *bs,
return bdrv_recurse_is_first_non_filter(s->test_file->bs, candidate);
}
-static void blkverify_refresh_filename(BlockDriverState *bs, QDict *options)
+static void blkverify_refresh_filename(BlockDriverState *bs)
{
BDRVBlkverifyState *s = bs->opaque;
- if (bs->file->bs->full_open_options
- && s->test_file->bs->full_open_options)
- {
- QDict *opts = qdict_new();
- qdict_put_str(opts, "driver", "blkverify");
-
- qdict_put(opts, "raw",
- qobject_ref(bs->file->bs->full_open_options));
- qdict_put(opts, "test",
- qobject_ref(s->test_file->bs->full_open_options));
-
- bs->full_open_options = opts;
- }
-
if (bs->file->bs->exact_filename[0]
&& s->test_file->bs->exact_filename[0])
{
diff --git a/block/commit.c b/block/commit.c
index dec1e89916..c06cf7fa0d 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -230,7 +230,7 @@ static int coroutine_fn bdrv_commit_top_preadv(BlockDriverState *bs,
return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags);
}
-static void bdrv_commit_top_refresh_filename(BlockDriverState *bs, QDict *opts)
+static void bdrv_commit_top_refresh_filename(BlockDriverState *bs)
{
pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
bs->backing->bs->filename);
diff --git a/block/mirror.c b/block/mirror.c
index 9c9bea276d..6af60d45bf 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1431,7 +1431,7 @@ static int coroutine_fn bdrv_mirror_top_pdiscard(BlockDriverState *bs,
NULL, 0);
}
-static void bdrv_mirror_top_refresh_filename(BlockDriverState *bs, QDict *opts)
+static void bdrv_mirror_top_refresh_filename(BlockDriverState *bs)
{
if (bs->backing == NULL) {
/* we can be here after failed bdrv_attach_child in
diff --git a/block/nbd.c b/block/nbd.c
index 5b4e4cf1db..fcc9e897e5 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -513,12 +513,9 @@ static void nbd_attach_aio_context(BlockDriverState *bs,
nbd_client_attach_aio_context(bs, new_context);
}
-static void nbd_refresh_filename(BlockDriverState *bs, QDict *options)
+static void nbd_refresh_filename(BlockDriverState *bs)
{
BDRVNBDState *s = bs->opaque;
- QDict *opts = qdict_new();
- QObject *saddr_qdict;
- Visitor *ov;
const char *host = NULL, *port = NULL, *path = NULL;
if (s->saddr->type == SOCKET_ADDRESS_TYPE_INET) {
@@ -531,8 +528,6 @@ static void nbd_refresh_filename(BlockDriverState *bs, QDict *options)
path = s->saddr->u.q_unix.path;
} /* else can't represent as pseudo-filename */
- qdict_put_str(opts, "driver", "nbd");
-
if (path && s->export) {
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
"nbd+unix:///%s?socket=%s", s->export, path);
@@ -546,22 +541,6 @@ static void nbd_refresh_filename(BlockDriverState *bs, QDict *options)
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
"nbd://%s:%s", host, port);
}
-
- ov = qobject_output_visitor_new(&saddr_qdict);
- visit_type_SocketAddress(ov, NULL, &s->saddr, &error_abort);
- visit_complete(ov, &saddr_qdict);
- visit_free(ov);
- qdict_put_obj(opts, "server", saddr_qdict);
-
- if (s->export) {
- qdict_put_str(opts, "export", s->export);
- }
- if (s->tlscredsid) {
- qdict_put_str(opts, "tls-creds", s->tlscredsid);
- }
-
- qdict_flatten(opts);
- bs->full_open_options = opts;
}
static char *nbd_dirname(BlockDriverState *bs, Error **errp)
diff --git a/block/nfs.c b/block/nfs.c
index 6985a44b89..531903610b 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -799,14 +799,9 @@ static int nfs_reopen_prepare(BDRVReopenState *state,
return 0;
}
-static void nfs_refresh_filename(BlockDriverState *bs, QDict *options)
+static void nfs_refresh_filename(BlockDriverState *bs)
{
NFSClient *client = bs->opaque;
- QDict *opts = qdict_new();
- QObject *server_qdict;
- Visitor *ov;
-
- qdict_put_str(opts, "driver", "nfs");
if (client->uid && !client->gid) {
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
@@ -824,35 +819,6 @@ static void nfs_refresh_filename(BlockDriverState *bs, QDict *options)
snprintf(bs->exact_filename, sizeof(bs->exact_filename),
"nfs://%s%s", client->server->host, client->path);
}
-
- ov = qobject_output_visitor_new(&server_qdict);
- visit_type_NFSServer(ov, NULL, &client->server, &error_abort);
- visit_complete(ov, &server_qdict);
- qdict_put_obj(opts, "server", server_qdict);
- qdict_put_str(opts, "path", client->path);
-
- if (client->uid) {
- qdict_put_int(opts, "user", client->uid);
- }
- if (client->gid) {
- qdict_put_int(opts, "group", client->gid);
- }
- if (client->tcp_syncnt) {
- qdict_put_int(opts, "tcp-syn-cnt", client->tcp_syncnt);
- }
- if (client->readahead) {
- qdict_put_int(opts, "readahead-size", client->readahead);
- }
- if (client->pagecache) {
- qdict_put_int(opts, "page-cache-size", client->pagecache);
- }
- if (client->debug) {
- qdict_put_int(opts, "debug", client->debug);
- }
-
- visit_free(ov);
- qdict_flatten(opts);
- bs->full_open_options = opts;
}
static char *nfs_dirname(BlockDriverState *bs, Error **errp)
diff --git a/block/null.c b/block/null.c
index 858892f0c4..1c56a0ef01 100644
--- a/block/null.c
+++ b/block/null.c
@@ -239,17 +239,23 @@ static int coroutine_fn null_co_block_status(BlockDriverState *bs,
return ret;
}
-static void null_refresh_filename(BlockDriverState *bs, QDict *opts)
+static void null_refresh_filename(BlockDriverState *bs)
{
- qdict_del(opts, "filename");
-
- if (!qdict_size(opts)) {
- snprintf(bs->exact_filename, sizeof(bs->exact_filename), "%s://",
- bs->drv->format_name);
+ const QDictEntry *e;
+
+ for (e = qdict_first(bs->full_open_options); e;
+ e = qdict_next(bs->full_open_options, e))
+ {
+ /* These options can be ignored */
+ if (strcmp(qdict_entry_key(e), "filename") &&
+ strcmp(qdict_entry_key(e), "driver"))
+ {
+ return;
+ }
}
- qdict_put_str(opts, "driver", bs->drv->format_name);
- bs->full_open_options = qobject_ref(opts);
+ snprintf(bs->exact_filename, sizeof(bs->exact_filename), "%s://",
+ bs->drv->format_name);
}
static const char *const null_strong_runtime_opts[] = {
diff --git a/block/nvme.c b/block/nvme.c
index 48677dd39c..0df7cb30fb 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -1058,17 +1058,23 @@ static int nvme_reopen_prepare(BDRVReopenState *reopen_state,
return 0;
}
-static void nvme_refresh_filename(BlockDriverState *bs, QDict *opts)
+static void nvme_refresh_filename(BlockDriverState *bs)
{
- qdict_del(opts, "filename");
-
- if (!qdict_size(opts)) {
- snprintf(bs->exact_filename, sizeof(bs->exact_filename), "%s://",
- bs->drv->format_name);
+ const QDictEntry *e;
+
+ for (e = qdict_first(bs->full_open_options); e;
+ e = qdict_next(bs->full_open_options, e))
+ {
+ /* These options can be ignored */
+ if (strcmp(qdict_entry_key(e), "filename") &&
+ strcmp(qdict_entry_key(e), "driver"))
+ {
+ return;
+ }
}
- qdict_put_str(opts, "driver", bs->drv->format_name);
- bs->full_open_options = qobject_ref(opts);
+ snprintf(bs->exact_filename, sizeof(bs->exact_filename), "%s://",
+ bs->drv->format_name);
}
static void nvme_refresh_limits(BlockDriverState *bs, Error **errp)
diff --git a/block/quorum.c b/block/quorum.c
index 644b173d53..587fe821e3 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -1072,35 +1072,6 @@ static void quorum_del_child(BlockDriverState *bs, BdrvChild *child,
bdrv_drained_end(bs);
}
-static void quorum_refresh_filename(BlockDriverState *bs, QDict *options)
-{
- BDRVQuorumState *s = bs->opaque;
- QDict *opts;
- QList *children;
- int i;
-
- for (i = 0; i < s->num_children; i++) {
- if (!s->children[i]->bs->full_open_options) {
- return;
- }
- }
-
- children = qlist_new();
- for (i = 0; i < s->num_children; i++) {
- qlist_append(children,
- qobject_ref(s->children[i]->bs->full_open_options));
- }
-
- opts = qdict_new();
- qdict_put_str(opts, "driver", "quorum");
- qdict_put_int(opts, QUORUM_OPT_VOTE_THRESHOLD, s->threshold);
- qdict_put_bool(opts, QUORUM_OPT_BLKVERIFY, s->is_blkverify);
- qdict_put_bool(opts, QUORUM_OPT_REWRITE, s->rewrite_corrupted);
- qdict_put(opts, "children", children);
-
- bs->full_open_options = opts;
-}
-
static void quorum_gather_child_options(BlockDriverState *bs, QDict *target,
bool backing_overridden)
{
@@ -1166,7 +1137,6 @@ static BlockDriver bdrv_quorum = {
.bdrv_open = quorum_open,
.bdrv_close = quorum_close,
- .bdrv_refresh_filename = quorum_refresh_filename,
.bdrv_gather_child_options = quorum_gather_child_options,
.bdrv_dirname = quorum_dirname,
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* Re: [Qemu-devel] [PATCH v11 24/31] block: Purify .bdrv_refresh_filename()
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 24/31] block: Purify .bdrv_refresh_filename() Max Reitz
@ 2018-10-11 13:50 ` Alberto Garcia
0 siblings, 0 replies; 41+ messages in thread
From: Alberto Garcia @ 2018-10-11 13:50 UTC (permalink / raw)
To: Max Reitz, qemu-block; +Cc: qemu-devel, Kevin Wolf
On Sat 06 Oct 2018 01:40:16 AM CEST, Max Reitz wrote:
> Currently, BlockDriver.bdrv_refresh_filename() is supposed to both
> refresh the filename (BDS.exact_filename) and set BDS.full_open_options.
> Now that we have generic code in the central bdrv_refresh_filename() for
> creating BDS.full_open_options, we can drop the latter part from all
> BlockDriver.bdrv_refresh_filename() implementations.
>
> This also means that we can drop all of the existing default code for
> this from the global bdrv_refresh_filename() itself.
>
> Furthermore, we now have to call BlockDriver.bdrv_refresh_filename()
> after having set BDS.full_open_options, because the block driver's
> implementation should now be allowed to depend on BDS.full_open_options
> being set correctly.
>
> Finally, with this patch we can drop the @options parameter from
> BlockDriver.bdrv_refresh_filename(); also, add a comment on this
> function's purpose in block/block_int.h while touching its interface.
>
> This completely obsoletes blklogwrite's implementation of
> .bdrv_refresh_filename().
>
> Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Berto
^ permalink raw reply [flat|nested] 41+ messages in thread
* [Qemu-devel] [PATCH v11 25/31] block: Do not copy exact_filename from format file
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (23 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 24/31] block: Purify .bdrv_refresh_filename() Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 26/31] block/nvme: Fix bdrv_refresh_filename() Max Reitz
` (5 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
If a format BDS's file BDS is in turn a format BDS, we cannot simply use
the same filename, because when opening a BDS tree based on a filename
alone, qemu will create only one format node on top of one protocol node
(disregarding a potential backing file).
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/block.c b/block.c
index c919093a04..041adb90d1 100644
--- a/block.c
+++ b/block.c
@@ -5419,9 +5419,21 @@ void bdrv_refresh_filename(BlockDriverState *bs)
bs->exact_filename[0] = '\0';
- /* If no specific options have been given for this BDS, the filename of
- * the underlying file should suffice for this one as well */
- if (bs->file->bs->exact_filename[0] && !generate_json_filename) {
+ /*
+ * We can use the underlying file's filename if:
+ * - it has a filename,
+ * - the file is a protocol BDS, and
+ * - opening that file (as this BDS's format) will automatically create
+ * the BDS tree we have right now, that is:
+ * - the user did not significantly change this BDS's behavior with
+ * some explicit (strong) options
+ * - no non-file child of this BDS has been overridden by the user
+ * Both of these conditions are represented by generate_json_filename.
+ */
+ if (bs->file->bs->exact_filename[0] &&
+ bs->file->bs->drv->bdrv_file_open &&
+ !generate_json_filename)
+ {
strcpy(bs->exact_filename, bs->file->bs->exact_filename);
}
}
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 26/31] block/nvme: Fix bdrv_refresh_filename()
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (24 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 25/31] block: Do not copy exact_filename from format file Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 27/31] block/curl: Harmonize option defaults Max Reitz
` (4 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Currently, nvme's bdrv_refresh_filename() is an exact copy of null's
implementation. However, for null, "null-co://" and "null-aio://" are
indeed valid filenames -- for nvme, they are not, as a device address is
still required.
The correct implementation should generate a filename of the form
"nvme://[PCI address]/[namespace]" (as the comment above
nvme_parse_filename() describes).
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block/nvme.c | 23 +++++++++--------------
1 file changed, 9 insertions(+), 14 deletions(-)
diff --git a/block/nvme.c b/block/nvme.c
index 0df7cb30fb..860a3d7113 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -111,6 +111,9 @@ typedef struct {
/* Total size of mapped qiov, accessed under dma_map_lock */
int dma_map_count;
+
+ /* PCI address (required for nvme_refresh_filename()) */
+ char *device;
} BDRVNVMeState;
#define NVME_BLOCK_OPT_DEVICE "device"
@@ -558,6 +561,7 @@ static int nvme_init(BlockDriverState *bs, const char *device, int namespace,
qemu_co_mutex_init(&s->dma_map_lock);
qemu_co_queue_init(&s->dma_flush_queue);
+ s->device = g_strdup(device);
s->nsid = namespace;
s->aio_context = bdrv_get_aio_context(bs);
ret = event_notifier_init(&s->irq_notifier, 0);
@@ -730,6 +734,8 @@ static void nvme_close(BlockDriverState *bs)
event_notifier_cleanup(&s->irq_notifier);
qemu_vfio_pci_unmap_bar(s->vfio, 0, (void *)s->regs, 0, NVME_BAR_SIZE);
qemu_vfio_close(s->vfio);
+
+ g_free(s->device);
}
static int nvme_file_open(BlockDriverState *bs, QDict *options, int flags,
@@ -1060,21 +1066,10 @@ static int nvme_reopen_prepare(BDRVReopenState *reopen_state,
static void nvme_refresh_filename(BlockDriverState *bs)
{
- const QDictEntry *e;
-
- for (e = qdict_first(bs->full_open_options); e;
- e = qdict_next(bs->full_open_options, e))
- {
- /* These options can be ignored */
- if (strcmp(qdict_entry_key(e), "filename") &&
- strcmp(qdict_entry_key(e), "driver"))
- {
- return;
- }
- }
+ BDRVNVMeState *s = bs->opaque;
- snprintf(bs->exact_filename, sizeof(bs->exact_filename), "%s://",
- bs->drv->format_name);
+ snprintf(bs->exact_filename, sizeof(bs->exact_filename), "nvme://%s/%i",
+ s->device, s->nsid);
}
static void nvme_refresh_limits(BlockDriverState *bs, Error **errp)
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 27/31] block/curl: Harmonize option defaults
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (25 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 26/31] block/nvme: Fix bdrv_refresh_filename() Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 28/31] block/curl: Implement bdrv_refresh_filename() Max Reitz
` (3 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Both of the defaults we currently have in the curl driver are named
based on a slightly different schema, let's unify that and call both
CURL_BLOCK_OPT_${NAME}_DEFAULT.
While at it, we can add a macro for the third option for which a default
exists, namely "sslverify".
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block/curl.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/block/curl.c b/block/curl.c
index dbbb72b5d7..96790fdc70 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -73,8 +73,6 @@ static CURLMcode __curl_multi_socket_action(CURLM *multi_handle,
#define CURL_NUM_STATES 8
#define CURL_NUM_ACB 8
-#define READ_AHEAD_DEFAULT (256 * 1024)
-#define CURL_TIMEOUT_DEFAULT 5
#define CURL_TIMEOUT_MAX 10000
#define CURL_BLOCK_OPT_URL "url"
@@ -88,6 +86,10 @@ static CURLMcode __curl_multi_socket_action(CURLM *multi_handle,
#define CURL_BLOCK_OPT_PROXY_USERNAME "proxy-username"
#define CURL_BLOCK_OPT_PROXY_PASSWORD_SECRET "proxy-password-secret"
+#define CURL_BLOCK_OPT_READAHEAD_DEFAULT (256 * 1024)
+#define CURL_BLOCK_OPT_SSLVERIFY_DEFAULT true
+#define CURL_BLOCK_OPT_TIMEOUT_DEFAULT 5
+
struct BDRVCURLState;
static bool libcurl_initialized;
@@ -708,7 +710,7 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags,
}
s->readahead_size = qemu_opt_get_size(opts, CURL_BLOCK_OPT_READAHEAD,
- READ_AHEAD_DEFAULT);
+ CURL_BLOCK_OPT_READAHEAD_DEFAULT);
if ((s->readahead_size & 0x1ff) != 0) {
error_setg(errp, "HTTP_READAHEAD_SIZE %zd is not a multiple of 512",
s->readahead_size);
@@ -716,13 +718,14 @@ static int curl_open(BlockDriverState *bs, QDict *options, int flags,
}
s->timeout = qemu_opt_get_number(opts, CURL_BLOCK_OPT_TIMEOUT,
- CURL_TIMEOUT_DEFAULT);
+ CURL_BLOCK_OPT_TIMEOUT_DEFAULT);
if (s->timeout > CURL_TIMEOUT_MAX) {
error_setg(errp, "timeout parameter is too large or negative");
goto out_noclean;
}
- s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY, true);
+ s->sslverify = qemu_opt_get_bool(opts, CURL_BLOCK_OPT_SSLVERIFY,
+ CURL_BLOCK_OPT_SSLVERIFY_DEFAULT);
cookie = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE);
cookie_secret = qemu_opt_get(opts, CURL_BLOCK_OPT_COOKIE_SECRET);
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 28/31] block/curl: Implement bdrv_refresh_filename()
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (26 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 27/31] block/curl: Harmonize option defaults Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 29/31] block/null: Generate filename even with latency-ns Max Reitz
` (2 subsequent siblings)
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block/curl.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/block/curl.c b/block/curl.c
index 96790fdc70..a5d3e64b84 100644
--- a/block/curl.c
+++ b/block/curl.c
@@ -963,6 +963,23 @@ static int64_t curl_getlength(BlockDriverState *bs)
return s->len;
}
+static void curl_refresh_filename(BlockDriverState *bs)
+{
+ BDRVCURLState *s = bs->opaque;
+
+ /* "readahead" and "timeout" do not change the guest-visible data,
+ * so ignore them */
+ if (s->sslverify != CURL_BLOCK_OPT_SSLVERIFY_DEFAULT ||
+ s->cookie || s->username || s->password || s->proxyusername ||
+ s->proxypassword)
+ {
+ return;
+ }
+
+ pstrcpy(bs->exact_filename, sizeof(bs->exact_filename), s->url);
+}
+
+
static const char *const curl_strong_runtime_opts[] = {
CURL_BLOCK_OPT_URL,
CURL_BLOCK_OPT_SSLVERIFY,
@@ -991,6 +1008,7 @@ static BlockDriver bdrv_http = {
.bdrv_detach_aio_context = curl_detach_aio_context,
.bdrv_attach_aio_context = curl_attach_aio_context,
+ .bdrv_refresh_filename = curl_refresh_filename,
.strong_runtime_opts = curl_strong_runtime_opts,
};
@@ -1009,6 +1027,7 @@ static BlockDriver bdrv_https = {
.bdrv_detach_aio_context = curl_detach_aio_context,
.bdrv_attach_aio_context = curl_attach_aio_context,
+ .bdrv_refresh_filename = curl_refresh_filename,
.strong_runtime_opts = curl_strong_runtime_opts,
};
@@ -1027,6 +1046,7 @@ static BlockDriver bdrv_ftp = {
.bdrv_detach_aio_context = curl_detach_aio_context,
.bdrv_attach_aio_context = curl_attach_aio_context,
+ .bdrv_refresh_filename = curl_refresh_filename,
.strong_runtime_opts = curl_strong_runtime_opts,
};
@@ -1045,6 +1065,7 @@ static BlockDriver bdrv_ftps = {
.bdrv_detach_aio_context = curl_detach_aio_context,
.bdrv_attach_aio_context = curl_attach_aio_context,
+ .bdrv_refresh_filename = curl_refresh_filename,
.strong_runtime_opts = curl_strong_runtime_opts,
};
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 29/31] block/null: Generate filename even with latency-ns
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (27 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 28/31] block/curl: Implement bdrv_refresh_filename() Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 30/31] block: BDS options may lack the "driver" option Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 31/31] iotests: Test json:{} filenames of internal BDSs Max Reitz
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
While we cannot represent the latency-ns option in a filename, it is not
a strong option so not being able to should not stop us from generating
a filename nonetheless.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block/null.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/block/null.c b/block/null.c
index 1c56a0ef01..a322929478 100644
--- a/block/null.c
+++ b/block/null.c
@@ -248,7 +248,8 @@ static void null_refresh_filename(BlockDriverState *bs)
{
/* These options can be ignored */
if (strcmp(qdict_entry_key(e), "filename") &&
- strcmp(qdict_entry_key(e), "driver"))
+ strcmp(qdict_entry_key(e), "driver") &&
+ strcmp(qdict_entry_key(e), NULL_OPT_LATENCY))
{
return;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 30/31] block: BDS options may lack the "driver" option
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (28 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 29/31] block/null: Generate filename even with latency-ns Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 31/31] iotests: Test json:{} filenames of internal BDSs Max Reitz
30 siblings, 0 replies; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
When BDSs are created by qemu itself (e.g. as filters in block jobs),
they may not have a "driver" option in their options QDict. When
generating a json:{} filename, however, it must always be present.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
---
block.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/block.c b/block.c
index 041adb90d1..ecb228b8f8 100644
--- a/block.c
+++ b/block.c
@@ -5306,6 +5306,12 @@ static bool append_strong_runtime_options(QDict *d, BlockDriverState *bs)
}
}
+ if (!qdict_haskey(d, "driver")) {
+ /* Drivers created with bdrv_new_open_driver() may not have a
+ * @driver option. Add it here. */
+ qdict_put_str(d, "driver", bs->drv->format_name);
+ }
+
return found_any;
}
--
2.17.1
^ permalink raw reply related [flat|nested] 41+ messages in thread* [Qemu-devel] [PATCH v11 31/31] iotests: Test json:{} filenames of internal BDSs
2018-10-05 23:39 [Qemu-devel] [PATCH v11 00/31] block: Fix some filename generation issues Max Reitz
` (29 preceding siblings ...)
2018-10-05 23:40 ` [Qemu-devel] [PATCH v11 30/31] block: BDS options may lack the "driver" option Max Reitz
@ 2018-10-05 23:40 ` Max Reitz
2018-10-11 14:03 ` Alberto Garcia
30 siblings, 1 reply; 41+ messages in thread
From: Max Reitz @ 2018-10-05 23:40 UTC (permalink / raw)
To: qemu-block; +Cc: qemu-devel, Max Reitz, Kevin Wolf, Alberto Garcia
Signed-off-by: Max Reitz <mreitz@redhat.com>
---
tests/qemu-iotests/224 | 139 +++++++++++++++++++++++++++++++++++++
tests/qemu-iotests/224.out | 18 +++++
tests/qemu-iotests/group | 1 +
3 files changed, 158 insertions(+)
create mode 100755 tests/qemu-iotests/224
create mode 100644 tests/qemu-iotests/224.out
diff --git a/tests/qemu-iotests/224 b/tests/qemu-iotests/224
new file mode 100755
index 0000000000..ef652ad488
--- /dev/null
+++ b/tests/qemu-iotests/224
@@ -0,0 +1,139 @@
+#!/usr/bin/env python
+#
+# Test json:{} filenames with qemu-internal BDSs
+# (the one of commit, to be precise)
+#
+# Copyright (C) 2018 Red Hat, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# Creator/Owner: Max Reitz <mreitz@redhat.com>
+
+import iotests
+from iotests import log, qemu_img, qemu_io_silent, filter_testfiles, \
+ filter_imgfmt
+import json
+
+# Need backing file support (for arbitrary backing formats)
+iotests.verify_image_format(supported_fmts=['qcow2', 'qcow', 'qed'])
+iotests.verify_platform(['linux'])
+
+
+# There are two variations of this test:
+# (1) We do not set filter_node_name. In that case, the commit_top
+# driver should not appear anywhere.
+# (2) We do set filter_node_name. In that case, it should appear.
+#
+# This for loop executes both.
+for filter_node_name in False, True:
+ log('')
+ log('--- filter_node_name: %s ---' % filter_node_name)
+ log('')
+
+ with iotests.FilePath('base.img') as base_img_path, \
+ iotests.FilePath('mid.img') as mid_img_path, \
+ iotests.FilePath('top.img') as top_img_path, \
+ iotests.VM() as vm:
+
+ assert qemu_img('create', '-f', iotests.imgfmt,
+ base_img_path, '64M') == 0
+ assert qemu_img('create', '-f', iotests.imgfmt, '-b', base_img_path,
+ mid_img_path) == 0
+ assert qemu_img('create', '-f', iotests.imgfmt, '-b', mid_img_path,
+ top_img_path) == 0
+
+ # Something to commit
+ assert qemu_io_silent(mid_img_path, '-c', 'write -P 1 0 1M') == 0
+
+ vm.launch()
+
+ # Change the bottom-most image's backing file (to null-co://)
+ # to enforce json:{} filenames
+ vm.qmp_log('blockdev-add',
+ node_name='top',
+ driver=iotests.imgfmt,
+ file={
+ 'driver': 'file',
+ 'filename': top_img_path
+ },
+ backing={
+ 'node-name': 'mid',
+ 'driver': iotests.imgfmt,
+ 'file': {
+ 'driver': 'file',
+ 'filename': mid_img_path
+ },
+ 'backing': {
+ 'node-name': 'base',
+ 'driver': iotests.imgfmt,
+ 'file': {
+ 'driver': 'file',
+ 'filename': base_img_path
+ },
+ 'backing': {
+ 'driver': 'null-co'
+ }
+ }
+ },
+ filters=[filter_testfiles, filter_imgfmt])
+
+ # As long as block-commit does not accept node names, we have to
+ # get our mid/base filenames here
+ mid_name = vm.node_info('mid')['image']['filename']
+ base_name = vm.node_info('base')['image']['filename']
+
+ assert mid_name[:5] == 'json:'
+ assert base_name[:5] == 'json:'
+
+ # Start the block job
+ if filter_node_name:
+ vm.qmp_log('block-commit',
+ job_id='commit',
+ device='top',
+ filter_node_name='filter_node',
+ top=mid_name,
+ base=base_name,
+ speed=1,
+ filters=[filter_testfiles, filter_imgfmt])
+ else:
+ vm.qmp_log('block-commit',
+ job_id='commit',
+ device='top',
+ top=mid_name,
+ base=base_name,
+ speed=1,
+ filters=[filter_testfiles, filter_imgfmt])
+
+ vm.qmp_log('job-pause', id='commit')
+
+ # Get and parse top's json:{} filename
+ top_name = vm.node_info('top')['image']['filename']
+
+ vm.shutdown()
+
+ assert top_name[:5] == 'json:'
+ top_options = json.loads(top_name[5:])
+
+ if filter_node_name:
+ # This should be present and set
+ assert top_options['backing']['driver'] == 'commit_top'
+ # And the mid image is commit_top's backing image
+ mid_options = top_options['backing']['backing']
+ else:
+ # The mid image should appear as the immediate backing BDS
+ # of top
+ mid_options = top_options['backing']
+
+ assert mid_options['driver'] == iotests.imgfmt
+ assert mid_options['file']['filename'] == mid_img_path
diff --git a/tests/qemu-iotests/224.out b/tests/qemu-iotests/224.out
new file mode 100644
index 0000000000..0230ae2c54
--- /dev/null
+++ b/tests/qemu-iotests/224.out
@@ -0,0 +1,18 @@
+
+--- filter_node_name: False ---
+
+{'execute': 'blockdev-add', 'arguments': {'backing': {'backing': {'backing': {'driver': 'null-co'}, 'node-name': 'base', 'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-base.img'}}, 'node-name': 'mid', 'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-mid.img'}}, 'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-top.img'}, 'node_name': 'top'}}
+{u'return': {}}
+{'execute': 'block-commit', 'arguments': {'device': 'top', 'top': u'json:{"backing": {"backing": {"driver": "null-co"}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-base.img"}}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-mid.img"}}', 'base': u'json:{"backing": {"driver": "null-co"}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-base.img"}}', 'speed': 1, 'job_id': 'commit'}}
+{u'return': {}}
+{'execute': 'job-pause', 'arguments': {'id': 'commit'}}
+{u'return': {}}
+
+--- filter_node_name: True ---
+
+{'execute': 'blockdev-add', 'arguments': {'backing': {'backing': {'backing': {'driver': 'null-co'}, 'node-name': 'base', 'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-base.img'}}, 'node-name': 'mid', 'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-mid.img'}}, 'driver': 'IMGFMT', 'file': {'driver': 'file', 'filename': 'TEST_DIR/PID-top.img'}, 'node_name': 'top'}}
+{u'return': {}}
+{'execute': 'block-commit', 'arguments': {'job_id': 'commit', 'top': u'json:{"backing": {"backing": {"driver": "null-co"}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-base.img"}}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-mid.img"}}', 'base': u'json:{"backing": {"driver": "null-co"}, "driver": "IMGFMT", "file": {"driver": "file", "filename": "TEST_DIR/PID-base.img"}}', 'device': 'top', 'filter_node_name': 'filter_node', 'speed': 1}}
+{u'return': {}}
+{'execute': 'job-pause', 'arguments': {'id': 'commit'}}
+{u'return': {}}
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 9b28c47fbe..18ad9091ce 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -222,6 +222,7 @@
221 rw auto quick
222 rw auto quick
223 rw auto quick
+224 rw auto quick
225 rw auto quick
226 auto quick
227 auto quick
--
2.17.1
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