From: Max Reitz <mreitz@redhat.com>
To: qemu-block@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
qemu-devel@nongnu.org, Max Reitz <mreitz@redhat.com>
Subject: [PATCH v3 10/33] block: Use bdrv_inherited_options()
Date: Tue, 18 Feb 2020 13:42:19 +0100 [thread overview]
Message-ID: <20200218124242.584644-11-mreitz@redhat.com> (raw)
In-Reply-To: <20200218124242.584644-1-mreitz@redhat.com>
Let child_file's, child_format's, and child_backing's .inherit_options()
implementations fall back to bdrv_inherited_options() to show that it
would really work for all of these cases, if only the parents passed the
appropriate BdrvChildRole and parent_is_format values.
(Also, make bdrv_open_inherit(), the only place to explicitly call
bdrv_backing_options(), call bdrv_inherited_options() instead.)
This patch should incur only two visible changes, both for child_format
children, both of which are effectively bug fixes:
First, they no longer have discard=unmap set by default. This reason it
was set is because bdrv_inherited_fmt_options() fell through to
bdrv_protocol_options(), and that set it because "format drivers take
care to send flushes and respect unmap policy". None of the drivers
that use child_format for their children (quorum and blkverify) are
format drivers, though, so this reasoning does not apply here.
Second, they no longer have BDRV_O_NO_IO force-cleared. child_format
was used solely for children that do not store any metadata and as such
will not be accessed by their parents as long as those parents do not
receive I/O themselves. Thus, such children should inherit
BDRV_O_NO_IO.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---
block.c | 66 ++++++++++++---------------------------------------------
1 file changed, 14 insertions(+), 52 deletions(-)
diff --git a/block.c b/block.c
index 9179b9b604..aa54d40e4f 100644
--- a/block.c
+++ b/block.c
@@ -1002,10 +1002,9 @@ static void bdrv_temp_snapshot_options(int *child_flags, QDict *child_options,
* Returns the options and flags that a generic child of a BDS should
* get, based on the given options and flags for the parent BDS.
*/
-static void __attribute__((unused))
- bdrv_inherited_options(BdrvChildRole role, bool parent_is_format,
- int *child_flags, QDict *child_options,
- int parent_flags, QDict *parent_options)
+static void bdrv_inherited_options(BdrvChildRole role, bool parent_is_format,
+ int *child_flags, QDict *child_options,
+ int parent_flags, QDict *parent_options)
{
int flags = parent_flags;
@@ -1090,31 +1089,9 @@ static void bdrv_protocol_options(BdrvChildRole role, bool parent_is_format,
int *child_flags, QDict *child_options,
int parent_flags, QDict *parent_options)
{
- int flags = parent_flags;
-
- /* Enable protocol handling, disable format probing for bs->file */
- flags |= BDRV_O_PROTOCOL;
-
- /* If the cache mode isn't explicitly set, inherit direct and no-flush from
- * the parent. */
- qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT);
- qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH);
- qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE);
-
- /* Inherit the read-only option from the parent if it's not set */
- qdict_copy_default(child_options, parent_options, BDRV_OPT_READ_ONLY);
- qdict_copy_default(child_options, parent_options, BDRV_OPT_AUTO_READ_ONLY);
-
- /* Our block drivers take care to send flushes and respect unmap policy,
- * so we can default to enable both on lower layers regardless of the
- * corresponding parent options. */
- qdict_set_default_str(child_options, BDRV_OPT_DISCARD, "unmap");
-
- /* Clear flags that only apply to the top layer */
- flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_COPY_ON_READ |
- BDRV_O_NO_IO);
-
- *child_flags = flags;
+ bdrv_inherited_options(BDRV_CHILD_IMAGE, true,
+ child_flags, child_options,
+ parent_flags, parent_options);
}
const BdrvChildClass child_file = {
@@ -1141,11 +1118,9 @@ static void bdrv_inherited_fmt_options(BdrvChildRole role,
int *child_flags, QDict *child_options,
int parent_flags, QDict *parent_options)
{
- child_file.inherit_options(role, parent_is_format,
- child_flags, child_options,
- parent_flags, parent_options);
-
- *child_flags &= ~(BDRV_O_PROTOCOL | BDRV_O_NO_IO);
+ bdrv_inherited_options(BDRV_CHILD_DATA, false,
+ child_flags, child_options,
+ parent_flags, parent_options);
}
const BdrvChildClass child_format = {
@@ -1227,23 +1202,9 @@ static void bdrv_backing_options(BdrvChildRole role, bool parent_is_format,
int *child_flags, QDict *child_options,
int parent_flags, QDict *parent_options)
{
- int flags = parent_flags;
-
- /* The cache mode is inherited unmodified for backing files; except WCE,
- * which is only applied on the top level (BlockBackend) */
- qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_DIRECT);
- qdict_copy_default(child_options, parent_options, BDRV_OPT_CACHE_NO_FLUSH);
- qdict_copy_default(child_options, parent_options, BDRV_OPT_FORCE_SHARE);
-
- /* backing files always opened read-only */
- qdict_set_default_str(child_options, BDRV_OPT_READ_ONLY, "on");
- qdict_set_default_str(child_options, BDRV_OPT_AUTO_READ_ONLY, "off");
- flags &= ~BDRV_O_COPY_ON_READ;
-
- /* snapshot=on is handled on the top layer */
- flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_TEMPORARY);
-
- *child_flags = flags;
+ bdrv_inherited_options(BDRV_CHILD_COW, true,
+ child_flags, child_options,
+ parent_flags, parent_options);
}
static int bdrv_backing_update_filename(BdrvChild *c, BlockDriverState *base,
@@ -3144,7 +3105,8 @@ static BlockDriverState *bdrv_open_inherit(const char *filename,
flags, options);
/* Let bdrv_backing_options() override "read-only" */
qdict_del(options, BDRV_OPT_READ_ONLY);
- bdrv_backing_options(0, true, &flags, options, flags, options);
+ bdrv_inherited_options(BDRV_CHILD_COW, true,
+ &flags, options, flags, options);
}
bs->open_flags = flags;
--
2.24.1
next prev parent reply other threads:[~2020-02-18 12:53 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-18 12:42 [PATCH v3 00/33] block: Introduce real BdrvChildRole Max Reitz
2020-02-18 12:42 ` [PATCH v3 01/33] block: Add BlockDriver.is_format Max Reitz
2020-02-18 12:42 ` [PATCH v3 02/33] block: Rename BdrvChildRole to BdrvChildClass Max Reitz
2020-02-18 12:42 ` [PATCH v3 03/33] block: Add BdrvChildRole and BdrvChildRoleBits Max Reitz
2020-02-18 13:05 ` Eric Blake
2020-05-05 11:19 ` Kevin Wolf
2020-05-05 11:59 ` Max Reitz
2020-05-05 12:54 ` Kevin Wolf
2020-05-05 13:20 ` Max Reitz
2020-05-05 13:38 ` Kevin Wolf
2020-02-18 12:42 ` [PATCH v3 04/33] block: Add BdrvChildRole to BdrvChild Max Reitz
2020-02-18 13:06 ` Eric Blake
2020-02-18 12:42 ` [PATCH v3 05/33] block: Pass BdrvChildRole to bdrv_child_perm() Max Reitz
2020-02-18 12:42 ` [PATCH v3 06/33] block: Pass BdrvChildRole to .inherit_options() Max Reitz
2020-02-18 12:42 ` [PATCH v3 07/33] block: Pass parent_is_format " Max Reitz
2020-02-18 12:42 ` [PATCH v3 08/33] block: Rename bdrv_inherited_options() Max Reitz
2020-02-18 12:42 ` [PATCH v3 09/33] block: Add generic bdrv_inherited_options() Max Reitz
2020-05-06 10:37 ` Kevin Wolf
2020-05-06 13:11 ` Kevin Wolf
2020-05-07 9:18 ` Max Reitz
2020-05-07 8:49 ` Max Reitz
2020-05-07 11:19 ` Kevin Wolf
2020-05-07 11:34 ` Max Reitz
2020-02-18 12:42 ` Max Reitz [this message]
2020-02-18 12:42 ` [PATCH v3 11/33] block: Unify bdrv_child_cb_attach() Max Reitz
2020-02-18 12:42 ` [PATCH v3 12/33] block: Unify bdrv_child_cb_detach() Max Reitz
2020-05-06 12:41 ` Kevin Wolf
2020-05-07 9:09 ` Max Reitz
2020-02-18 12:42 ` [PATCH v3 13/33] block: Add child_of_bds Max Reitz
2020-05-06 12:59 ` Kevin Wolf
2020-02-18 12:42 ` [PATCH v3 14/33] block: Distinguish paths in *_format_default_perms Max Reitz
2020-02-18 12:42 ` [PATCH v3 15/33] block: Pull out bdrv_default_perms_for_backing() Max Reitz
2020-05-06 13:21 ` Kevin Wolf
2020-05-07 9:19 ` Max Reitz
2020-02-18 12:42 ` [PATCH v3 16/33] block: Pull out bdrv_default_perms_for_storage() Max Reitz
2020-02-18 12:42 ` [PATCH v3 17/33] block: Split bdrv_default_perms_for_storage() Max Reitz
2020-02-18 12:42 ` [PATCH v3 18/33] block: Add bdrv_default_perms() Max Reitz
2020-05-06 13:47 ` Kevin Wolf
2020-05-07 9:26 ` Max Reitz
2020-02-18 12:42 ` [PATCH v3 19/33] raw-format: Split raw_read_options() Max Reitz
2020-02-18 12:42 ` [PATCH v3 20/33] block: Switch child_format users to child_of_bds Max Reitz
2020-02-18 13:10 ` Eric Blake
2020-02-18 12:42 ` [PATCH v3 21/33] block: Drop child_format Max Reitz
2020-02-18 12:42 ` [PATCH v3 22/33] block: Make backing files child_of_bds children Max Reitz
2020-05-06 16:37 ` Kevin Wolf
2020-05-07 9:28 ` Max Reitz
2020-02-18 12:42 ` [PATCH v3 23/33] block: Drop child_backing Max Reitz
2020-02-18 12:42 ` [PATCH v3 24/33] block: Make format drivers use child_of_bds Max Reitz
2020-02-18 12:42 ` [PATCH v3 25/33] block: Make filter " Max Reitz
2020-02-18 12:42 ` [PATCH v3 26/33] block: Use child_of_bds in remaining places Max Reitz
2020-05-06 17:04 ` Kevin Wolf
2020-05-07 9:33 ` Max Reitz
2020-05-07 11:32 ` Kevin Wolf
2020-02-18 12:42 ` [PATCH v3 27/33] tests: Use child_of_bds instead of child_file Max Reitz
2020-02-18 12:42 ` [PATCH v3 28/33] block: Use bdrv_default_perms() Max Reitz
2020-02-18 12:42 ` [PATCH v3 29/33] block: Make bdrv_filter_default_perms() static Max Reitz
2020-02-18 12:42 ` [PATCH v3 30/33] block: Drop bdrv_format_default_perms() Max Reitz
2020-02-18 12:42 ` [PATCH v3 31/33] block: Drop child_file Max Reitz
2020-02-18 12:42 ` [PATCH v3 32/33] block: Pass BdrvChildRole in remaining cases Max Reitz
2020-05-06 17:13 ` Kevin Wolf
2020-05-07 9:36 ` Max Reitz
2020-05-07 11:40 ` Kevin Wolf
2020-02-18 12:42 ` [PATCH v3 33/33] block: Drop @child_class from bdrv_child_perm() Max Reitz
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