[Qemu-devel] [PULL v2 00/12] Block layer patches

[Qemu-devel] [PULL v2 00/12] Block layer patches

[Kevin Wolf]

The following changes since commit fe8d2d5737ab20ed0118863f5eb888cae37122ab:

  Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-3.0-pull-request' into staging (2018-07-04 22:38:10 +0100)

are available in the git repository at:

  git://repo.or.cz/qemu/kevin.git tags/for-upstream

for you to fetch changes up to 7c20c808a5cbf5d244735bc78fc3138c739c1946:

  file-posix: Unlock FD after creation (2018-07-05 11:07:58 +0200)

----------------------------------------------------------------
Block layer patches:

- qcow2: Use worker threads for compression to improve performance of
  'qemu-img convert -W' and compressed backup jobs
- blklogwrites: New filter driver to log write requests to an image in
  the dm-log-writes format
- file-posix: Fix image locking during image creation
- crypto: Fix memory leak in error path
- Error out instead of silently truncating node names

----------------------------------------------------------------
Aapo Vienamo (1):
      block: Add blklogwrites

Ari Sundholm (4):
      block: Move two block permission constants to the relevant enum
      block/blklogwrites: Change log_sector_size from int64_t to uint64_t
      block/blklogwrites: Add an option for appending to an old log
      block/blklogwrites: Add an option for the update interval of the log superblock

Kevin Wolf (2):
      block: Don't silently truncate node names
      block/crypto: Fix memory leak in create error path

Max Reitz (2):
      file-posix: Fix creation locking
      file-posix: Unlock FD after creation

Vladimir Sementsov-Ogievskiy (3):
      qemu-img: allow compressed not-in-order writes
      qcow2: refactor data compression
      qcow2: add compress threads

 qapi/block-core.json          |  38 ++-
 block/qcow2.h                 |   3 +
 include/block/block.h         |   7 +
 block.c                       |  12 +-
 block/blklogwrites.c          | 547 ++++++++++++++++++++++++++++++++++++++++++
 block/crypto.c                |   2 +-
 block/file-posix.c            |  21 +-
 block/qcow2.c                 | 138 ++++++++---
 qemu-img.c                    |   5 -
 MAINTAINERS                   |   6 +
 block/Makefile.objs           |   1 +
 tests/qemu-iotests/051        |  15 ++
 tests/qemu-iotests/051.out    |  23 ++
 tests/qemu-iotests/051.pc.out |  23 ++
 14 files changed, 791 insertions(+), 50 deletions(-)
 create mode 100644 block/blklogwrites.c

[Qemu-devel] [PULL v2 01/12] qemu-img: allow compressed not-in-order writes

[Kevin Wolf]

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

No reason to forbid them, and they are needed to improve performance
with compress-threads in further patches.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qemu-img.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/qemu-img.c b/qemu-img.c
index e1a506f7f6..7651d8172c 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2141,11 +2141,6 @@ static int img_convert(int argc, char **argv)
         goto fail_getopt;
     }
 
-    if (!s.wr_in_order && s.compressed) {
-        error_report("Out of order write and compress are mutually exclusive");
-        goto fail_getopt;
-    }
-
     if (tgt_image_opts && !skip_create) {
         error_report("--target-image-opts requires use of -n flag");
         goto fail_getopt;
-- 
2.13.6

[Qemu-devel] [PULL v2 02/12] qcow2: refactor data compression

[Kevin Wolf]

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Make a separate function for compression to be parallelized later.
 - use .avail_out field instead of .next_out to calculate size of
   compressed data. It looks more natural and it allows to keep dest to
   be void pointer
 - set avail_out to be at least one byte less than input, to be sure
   avoid inefficient compression earlier

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/qcow2.c | 78 ++++++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 51 insertions(+), 27 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index 2f9e58e0c4..9cee653d96 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -23,11 +23,14 @@
  */
 
 #include "qemu/osdep.h"
+
+#define ZLIB_CONST
+#include <zlib.h>
+
 #include "block/block_int.h"
 #include "block/qdict.h"
 #include "sysemu/block-backend.h"
 #include "qemu/module.h"
-#include <zlib.h>
 #include "qcow2.h"
 #include "qemu/error-report.h"
 #include "qapi/error.h"
@@ -3650,6 +3653,48 @@ fail:
     return ret;
 }
 
+/*
+ * qcow2_compress()
+ *
+ * @dest - destination buffer, at least of @size-1 bytes
+ * @src - source buffer, @size bytes
+ *
+ * Returns: compressed size on success
+ *          -1 if compression is inefficient
+ *          -2 on any other error
+ */
+static ssize_t qcow2_compress(void *dest, const void *src, size_t size)
+{
+    ssize_t ret;
+    z_stream strm;
+
+    /* best compression, small window, no zlib header */
+    memset(&strm, 0, sizeof(strm));
+    ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
+                       -12, 9, Z_DEFAULT_STRATEGY);
+    if (ret != 0) {
+        return -2;
+    }
+
+    /* strm.next_in is not const in old zlib versions, such as those used on
+     * OpenBSD/NetBSD, so cast the const away */
+    strm.avail_in = size;
+    strm.next_in = (void *) src;
+    strm.avail_out = size - 1;
+    strm.next_out = dest;
+
+    ret = deflate(&strm, Z_FINISH);
+    if (ret == Z_STREAM_END) {
+        ret = size - 1 - strm.avail_out;
+    } else {
+        ret = (ret == Z_OK ? -1 : -2);
+    }
+
+    deflateEnd(&strm);
+
+    return ret;
+}
+
 /* XXX: put compressed sectors first, then all the cluster aligned
    tables to avoid losing bytes in alignment */
 static coroutine_fn int
@@ -3659,8 +3704,8 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
     BDRVQcow2State *s = bs->opaque;
     QEMUIOVector hd_qiov;
     struct iovec iov;
-    z_stream strm;
-    int ret, out_len;
+    int ret;
+    size_t out_len;
     uint8_t *buf, *out_buf;
     int64_t cluster_offset;
 
@@ -3694,32 +3739,11 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
 
     out_buf = g_malloc(s->cluster_size);
 
-    /* best compression, small window, no zlib header */
-    memset(&strm, 0, sizeof(strm));
-    ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION,
-                       Z_DEFLATED, -12,
-                       9, Z_DEFAULT_STRATEGY);
-    if (ret != 0) {
+    out_len = qcow2_compress(out_buf, buf, s->cluster_size);
+    if (out_len == -2) {
         ret = -EINVAL;
         goto fail;
-    }
-
-    strm.avail_in = s->cluster_size;
-    strm.next_in = (uint8_t *)buf;
-    strm.avail_out = s->cluster_size;
-    strm.next_out = out_buf;
-
-    ret = deflate(&strm, Z_FINISH);
-    if (ret != Z_STREAM_END && ret != Z_OK) {
-        deflateEnd(&strm);
-        ret = -EINVAL;
-        goto fail;
-    }
-    out_len = strm.next_out - out_buf;
-
-    deflateEnd(&strm);
-
-    if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
+    } else if (out_len == -1) {
         /* could not compress: write normal cluster */
         ret = qcow2_co_pwritev(bs, offset, bytes, qiov, 0);
         if (ret < 0) {
-- 
2.13.6

[Qemu-devel] [PULL v2 03/12] qcow2: add compress threads

[Kevin Wolf]

From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>

Do data compression in separate threads. This significantly improve
performance for qemu-img convert with -W (allow async writes) and -c
(compressed) options.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/qcow2.h |  3 +++
 block/qcow2.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/block/qcow2.h b/block/qcow2.h
index 1c9c0d3631..d6aca687d6 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -326,6 +326,9 @@ typedef struct BDRVQcow2State {
      * override) */
     char *image_backing_file;
     char *image_backing_format;
+
+    CoQueue compress_wait_queue;
+    int nb_compress_threads;
 } BDRVQcow2State;
 
 typedef struct Qcow2COWRegion {
diff --git a/block/qcow2.c b/block/qcow2.c
index 9cee653d96..33b61b7480 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -44,6 +44,7 @@
 #include "qapi/qobject-input-visitor.h"
 #include "qapi/qapi-visit-block-core.h"
 #include "crypto.h"
+#include "block/thread-pool.h"
 
 /*
   Differences with QCOW:
@@ -1544,6 +1545,9 @@ static int coroutine_fn qcow2_do_open(BlockDriverState *bs, QDict *options,
         qcow2_check_refcounts(bs, &result, 0);
     }
 #endif
+
+    qemu_co_queue_init(&s->compress_wait_queue);
+
     return ret;
 
  fail:
@@ -3695,6 +3699,62 @@ static ssize_t qcow2_compress(void *dest, const void *src, size_t size)
     return ret;
 }
 
+#define MAX_COMPRESS_THREADS 4
+
+typedef struct Qcow2CompressData {
+    void *dest;
+    const void *src;
+    size_t size;
+    ssize_t ret;
+} Qcow2CompressData;
+
+static int qcow2_compress_pool_func(void *opaque)
+{
+    Qcow2CompressData *data = opaque;
+
+    data->ret = qcow2_compress(data->dest, data->src, data->size);
+
+    return 0;
+}
+
+static void qcow2_compress_complete(void *opaque, int ret)
+{
+    qemu_coroutine_enter(opaque);
+}
+
+/* See qcow2_compress definition for parameters description */
+static ssize_t qcow2_co_compress(BlockDriverState *bs,
+                                 void *dest, const void *src, size_t size)
+{
+    BDRVQcow2State *s = bs->opaque;
+    BlockAIOCB *acb;
+    ThreadPool *pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
+    Qcow2CompressData arg = {
+        .dest = dest,
+        .src = src,
+        .size = size,
+    };
+
+    while (s->nb_compress_threads >= MAX_COMPRESS_THREADS) {
+        qemu_co_queue_wait(&s->compress_wait_queue, NULL);
+    }
+
+    s->nb_compress_threads++;
+    acb = thread_pool_submit_aio(pool, qcow2_compress_pool_func, &arg,
+                                 qcow2_compress_complete,
+                                 qemu_coroutine_self());
+
+    if (!acb) {
+        s->nb_compress_threads--;
+        return -EINVAL;
+    }
+    qemu_coroutine_yield();
+    s->nb_compress_threads--;
+    qemu_co_queue_next(&s->compress_wait_queue);
+
+    return arg.ret;
+}
+
 /* XXX: put compressed sectors first, then all the cluster aligned
    tables to avoid losing bytes in alignment */
 static coroutine_fn int
@@ -3739,7 +3799,7 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
 
     out_buf = g_malloc(s->cluster_size);
 
-    out_len = qcow2_compress(out_buf, buf, s->cluster_size);
+    out_len = qcow2_co_compress(bs, out_buf, buf, s->cluster_size);
     if (out_len == -2) {
         ret = -EINVAL;
         goto fail;
-- 
2.13.6

[Qemu-devel] [PULL v2 04/12] block: Move two block permission constants to the relevant enum

[Kevin Wolf]

From: Ari Sundholm <ari@tuxera.com>

This allows using the two constants outside of block.c, which will
happen in a subsequent patch.

Signed-off-by: Ari Sundholm <ari@tuxera.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 include/block/block.h | 7 +++++++
 block.c               | 6 ------
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/include/block/block.h b/include/block/block.h
index e5c7759a0c..bc76b1e59f 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -225,6 +225,13 @@ enum {
     BLK_PERM_GRAPH_MOD          = 0x10,
 
     BLK_PERM_ALL                = 0x1f,
+
+    DEFAULT_PERM_PASSTHROUGH    = BLK_PERM_CONSISTENT_READ
+                                 | BLK_PERM_WRITE
+                                 | BLK_PERM_WRITE_UNCHANGED
+                                 | BLK_PERM_RESIZE,
+
+    DEFAULT_PERM_UNCHANGED      = BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH,
 };
 
 char *bdrv_perm_names(uint64_t perm);
diff --git a/block.c b/block.c
index 70a46fdd84..961ec97d26 100644
--- a/block.c
+++ b/block.c
@@ -1948,12 +1948,6 @@ int bdrv_child_try_set_perm(BdrvChild *c, uint64_t perm, uint64_t shared,
     return 0;
 }
 
-#define DEFAULT_PERM_PASSTHROUGH (BLK_PERM_CONSISTENT_READ \
-                                 | BLK_PERM_WRITE \
-                                 | BLK_PERM_WRITE_UNCHANGED \
-                                 | BLK_PERM_RESIZE)
-#define DEFAULT_PERM_UNCHANGED (BLK_PERM_ALL & ~DEFAULT_PERM_PASSTHROUGH)
-
 void bdrv_filter_default_perms(BlockDriverState *bs, BdrvChild *c,
                                const BdrvChildRole *role,
                                BlockReopenQueue *reopen_queue,
-- 
2.13.6

[Qemu-devel] [PULL v2 05/12] block: Add blklogwrites

[Kevin Wolf]

From: Aapo Vienamo <aapo@tuxera.com>

Implements a block device write logging system, similar to Linux kernel
device mapper dm-log-writes. The write operations that are performed
on a block device are logged to a file or another block device. The
write log format is identical to the dm-log-writes format. Currently,
log markers are not supported.

This functionality can be used for crash consistency and fs consistency
testing. By implementing it in qemu, tests utilizing write logs can be
be used to test non-Linux drivers and older kernels.

The driver accepts an optional parameter to set the sector size used
for logging. This makes the driver require all requests to be aligned
to this sector size and also makes offsets and sizes of writes in the
log metadata to be expressed in terms of this value (the log format has
a granularity of one sector for offsets and sizes). This allows
accurate logging of writes to guest block devices that have unusual
sector sizes.

The implementation is based on the blkverify and blkdebug block
drivers.

Signed-off-by: Aapo Vienamo <aapo@tuxera.com>
Signed-off-by: Ari Sundholm <ari@tuxera.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qapi/block-core.json |  33 +++-
 block/blklogwrites.c | 414 +++++++++++++++++++++++++++++++++++++++++++++++++++
 MAINTAINERS          |   6 +
 block/Makefile.objs  |   1 +
 4 files changed, 448 insertions(+), 6 deletions(-)
 create mode 100644 block/blklogwrites.c

diff --git a/qapi/block-core.json b/qapi/block-core.json
index 90e554ed0f..a9eab8cab8 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -2533,16 +2533,17 @@
 # @throttle: Since 2.11
 # @nvme: Since 2.12
 # @copy-on-read: Since 3.0
+# @blklogwrites: Since 3.0
 #
 # Since: 2.9
 ##
 { 'enum': 'BlockdevDriver',
-  'data': [ 'blkdebug', 'blkverify', 'bochs', 'cloop', 'copy-on-read',
-            'dmg', 'file', 'ftp', 'ftps', 'gluster', 'host_cdrom',
-            'host_device', 'http', 'https', 'iscsi', 'luks', 'nbd', 'nfs',
-            'null-aio', 'null-co', 'nvme', 'parallels', 'qcow', 'qcow2', 'qed',
-            'quorum', 'raw', 'rbd', 'replication', 'sheepdog', 'ssh',
-            'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat', 'vxhs' ] }
+  'data': [ 'blkdebug', 'blklogwrites', 'blkverify', 'bochs', 'cloop',
+            'copy-on-read', 'dmg', 'file', 'ftp', 'ftps', 'gluster',
+            'host_cdrom', 'host_device', 'http', 'https', 'iscsi', 'luks',
+            'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels', 'qcow',
+            'qcow2', 'qed', 'quorum', 'raw', 'rbd', 'replication', 'sheepdog',
+            'ssh', 'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat', 'vxhs' ] }
 
 ##
 # @BlockdevOptionsFile:
@@ -3045,6 +3046,25 @@
             '*set-state': ['BlkdebugSetStateOptions'] } }
 
 ##
+# @BlockdevOptionsBlklogwrites:
+#
+# Driver specific block device options for blklogwrites.
+#
+# @file:            block device
+#
+# @log:             block device used to log writes to @file
+#
+# @log-sector-size: sector size used in logging writes to @file, determines
+#                   granularity of offsets and sizes of writes (default: 512)
+#
+# Since: 3.0
+##
+{ 'struct': 'BlockdevOptionsBlklogwrites',
+  'data': { 'file': 'BlockdevRef',
+            'log': 'BlockdevRef',
+            '*log-sector-size': 'uint32' } }
+
+##
 # @BlockdevOptionsBlkverify:
 #
 # Driver specific block device options for blkverify.
@@ -3563,6 +3583,7 @@
   'discriminator': 'driver',
   'data': {
       'blkdebug':   'BlockdevOptionsBlkdebug',
+      'blklogwrites':'BlockdevOptionsBlklogwrites',
       'blkverify':  'BlockdevOptionsBlkverify',
       'bochs':      'BlockdevOptionsGenericFormat',
       'cloop':      'BlockdevOptionsGenericFormat',
diff --git a/block/blklogwrites.c b/block/blklogwrites.c
new file mode 100644
index 0000000000..47093fadd6
--- /dev/null
+++ b/block/blklogwrites.c
@@ -0,0 +1,414 @@
+/*
+ * Write logging blk driver based on blkverify and blkdebug.
+ *
+ * Copyright (c) 2017 Tuomas Tynkkynen <tuomas@tuxera.com>
+ * Copyright (c) 2018 Aapo Vienamo <aapo@tuxera.com>
+ * Copyright (c) 2018 Ari Sundholm <ari@tuxera.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/sockets.h" /* for EINPROGRESS on Windows */
+#include "block/block_int.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qstring.h"
+#include "qemu/cutils.h"
+#include "qemu/option.h"
+
+/* Disk format stuff - taken from Linux drivers/md/dm-log-writes.c */
+
+#define LOG_FLUSH_FLAG   (1 << 0)
+#define LOG_FUA_FLAG     (1 << 1)
+#define LOG_DISCARD_FLAG (1 << 2)
+#define LOG_MARK_FLAG    (1 << 3)
+
+#define WRITE_LOG_VERSION 1ULL
+#define WRITE_LOG_MAGIC 0x6a736677736872ULL
+
+/* All fields are little-endian. */
+struct log_write_super {
+    uint64_t magic;
+    uint64_t version;
+    uint64_t nr_entries;
+    uint32_t sectorsize;
+} QEMU_PACKED;
+
+struct log_write_entry {
+    uint64_t sector;
+    uint64_t nr_sectors;
+    uint64_t flags;
+    uint64_t data_len;
+} QEMU_PACKED;
+
+/* End of disk format structures. */
+
+typedef struct {
+    BdrvChild *log_file;
+    uint32_t sectorsize;
+    uint32_t sectorbits;
+    uint64_t cur_log_sector;
+    uint64_t nr_entries;
+} BDRVBlkLogWritesState;
+
+static QemuOptsList runtime_opts = {
+    .name = "blklogwrites",
+    .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
+    .desc = {
+        {
+            .name = "log-sector-size",
+            .type = QEMU_OPT_SIZE,
+            .help = "Log sector size",
+        },
+        { /* end of list */ }
+    },
+};
+
+static inline uint32_t blk_log_writes_log2(uint32_t value)
+{
+    assert(value > 0);
+    return 31 - clz32(value);
+}
+
+static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
+                               Error **errp)
+{
+    BDRVBlkLogWritesState *s = bs->opaque;
+    QemuOpts *opts;
+    Error *local_err = NULL;
+    int ret;
+    int64_t log_sector_size;
+
+    opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (local_err) {
+        ret = -EINVAL;
+        error_propagate(errp, local_err);
+        goto fail;
+    }
+
+    /* Open the file */
+    bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, false,
+                               &local_err);
+    if (local_err) {
+        ret = -EINVAL;
+        error_propagate(errp, local_err);
+        goto fail;
+    }
+
+    log_sector_size = qemu_opt_get_size(opts, "log-sector-size",
+                                        BDRV_SECTOR_SIZE);
+
+    if (log_sector_size < 0 || log_sector_size > (1ull << 23) ||
+        !is_power_of_2(log_sector_size))
+    {
+        ret = -EINVAL;
+        error_setg(errp, "Invalid log sector size %"PRId64, log_sector_size);
+        goto fail;
+    }
+
+    s->sectorsize = log_sector_size;
+    s->sectorbits = blk_log_writes_log2(log_sector_size);
+    s->cur_log_sector = 1;
+    s->nr_entries = 0;
+
+    /* Open the log file */
+    s->log_file = bdrv_open_child(NULL, options, "log", bs, &child_file, false,
+                                  &local_err);
+    if (local_err) {
+        ret = -EINVAL;
+        error_propagate(errp, local_err);
+        goto fail;
+    }
+
+    ret = 0;
+fail:
+    if (ret < 0) {
+        bdrv_unref_child(bs, bs->file);
+        bs->file = NULL;
+    }
+    qemu_opts_del(opts);
+    return ret;
+}
+
+static void blk_log_writes_close(BlockDriverState *bs)
+{
+    BDRVBlkLogWritesState *s = bs->opaque;
+
+    bdrv_unref_child(bs, s->log_file);
+    s->log_file = NULL;
+}
+
+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;
+
+    /* 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)
+    {
+        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,
+                                      uint64_t perm, uint64_t shrd,
+                                      uint64_t *nperm, uint64_t *nshrd)
+{
+    if (!c) {
+        *nperm = perm & DEFAULT_PERM_PASSTHROUGH;
+        *nshrd = (shrd & DEFAULT_PERM_PASSTHROUGH) | DEFAULT_PERM_UNCHANGED;
+        return;
+    }
+
+    if (!strcmp(c->name, "log")) {
+        bdrv_format_default_perms(bs, c, role, ro_q, perm, shrd, nperm, nshrd);
+    } else {
+        bdrv_filter_default_perms(bs, c, role, ro_q, perm, shrd, nperm, nshrd);
+    }
+}
+
+static void blk_log_writes_refresh_limits(BlockDriverState *bs, Error **errp)
+{
+    BDRVBlkLogWritesState *s = bs->opaque;
+    bs->bl.request_alignment = s->sectorsize;
+}
+
+static int coroutine_fn
+blk_log_writes_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
+                         QEMUIOVector *qiov, int flags)
+{
+    return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags);
+}
+
+typedef struct BlkLogWritesFileReq {
+    BlockDriverState *bs;
+    uint64_t offset;
+    uint64_t bytes;
+    int file_flags;
+    QEMUIOVector *qiov;
+    int (*func)(struct BlkLogWritesFileReq *r);
+    int file_ret;
+} BlkLogWritesFileReq;
+
+typedef struct {
+    BlockDriverState *bs;
+    QEMUIOVector *qiov;
+    struct log_write_entry entry;
+    uint64_t zero_size;
+    int log_ret;
+} BlkLogWritesLogReq;
+
+static void coroutine_fn blk_log_writes_co_do_log(BlkLogWritesLogReq *lr)
+{
+    BDRVBlkLogWritesState *s = lr->bs->opaque;
+    uint64_t cur_log_offset = s->cur_log_sector << s->sectorbits;
+
+    s->nr_entries++;
+    s->cur_log_sector +=
+            ROUND_UP(lr->qiov->size, s->sectorsize) >> s->sectorbits;
+
+    lr->log_ret = bdrv_co_pwritev(s->log_file, cur_log_offset, lr->qiov->size,
+                                  lr->qiov, 0);
+
+    /* Logging for the "write zeroes" operation */
+    if (lr->log_ret == 0 && lr->zero_size) {
+        cur_log_offset = s->cur_log_sector << s->sectorbits;
+        s->cur_log_sector +=
+                ROUND_UP(lr->zero_size, s->sectorsize) >> s->sectorbits;
+
+        lr->log_ret = bdrv_co_pwrite_zeroes(s->log_file, cur_log_offset,
+                                            lr->zero_size, 0);
+    }
+
+    /* Update super block on flush */
+    if (lr->log_ret == 0 && lr->entry.flags & LOG_FLUSH_FLAG) {
+        struct log_write_super super = {
+            .magic      = cpu_to_le64(WRITE_LOG_MAGIC),
+            .version    = cpu_to_le64(WRITE_LOG_VERSION),
+            .nr_entries = cpu_to_le64(s->nr_entries),
+            .sectorsize = cpu_to_le32(s->sectorsize),
+        };
+        void *zeroes = g_malloc0(s->sectorsize - sizeof(super));
+        QEMUIOVector qiov;
+
+        qemu_iovec_init(&qiov, 2);
+        qemu_iovec_add(&qiov, &super, sizeof(super));
+        qemu_iovec_add(&qiov, zeroes, s->sectorsize - sizeof(super));
+
+        lr->log_ret =
+            bdrv_co_pwritev(s->log_file, 0, s->sectorsize, &qiov, 0);
+        if (lr->log_ret == 0) {
+            lr->log_ret = bdrv_co_flush(s->log_file->bs);
+        }
+        qemu_iovec_destroy(&qiov);
+        g_free(zeroes);
+    }
+}
+
+static void coroutine_fn blk_log_writes_co_do_file(BlkLogWritesFileReq *fr)
+{
+    fr->file_ret = fr->func(fr);
+}
+
+static int coroutine_fn
+blk_log_writes_co_log(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
+                      QEMUIOVector *qiov, int flags,
+                      int (*file_func)(BlkLogWritesFileReq *r),
+                      uint64_t entry_flags, bool is_zero_write)
+{
+    QEMUIOVector log_qiov;
+    size_t niov = qiov ? qiov->niov : 0;
+    BDRVBlkLogWritesState *s = bs->opaque;
+    BlkLogWritesFileReq fr = {
+        .bs         = bs,
+        .offset     = offset,
+        .bytes      = bytes,
+        .file_flags = flags,
+        .qiov       = qiov,
+        .func       = file_func,
+    };
+    BlkLogWritesLogReq lr = {
+        .bs             = bs,
+        .qiov           = &log_qiov,
+        .entry = {
+            .sector     = cpu_to_le64(offset >> s->sectorbits),
+            .nr_sectors = cpu_to_le64(bytes >> s->sectorbits),
+            .flags      = cpu_to_le64(entry_flags),
+            .data_len   = 0,
+        },
+        .zero_size = is_zero_write ? bytes : 0,
+    };
+    void *zeroes = g_malloc0(s->sectorsize - sizeof(lr.entry));
+
+    assert((1 << s->sectorbits) == s->sectorsize);
+    assert(bs->bl.request_alignment == s->sectorsize);
+    assert(QEMU_IS_ALIGNED(offset, bs->bl.request_alignment));
+    assert(QEMU_IS_ALIGNED(bytes, bs->bl.request_alignment));
+
+    qemu_iovec_init(&log_qiov, niov + 2);
+    qemu_iovec_add(&log_qiov, &lr.entry, sizeof(lr.entry));
+    qemu_iovec_add(&log_qiov, zeroes, s->sectorsize - sizeof(lr.entry));
+    if (qiov) {
+        qemu_iovec_concat(&log_qiov, qiov, 0, qiov->size);
+    }
+
+    blk_log_writes_co_do_file(&fr);
+    blk_log_writes_co_do_log(&lr);
+
+    qemu_iovec_destroy(&log_qiov);
+    g_free(zeroes);
+
+    if (lr.log_ret < 0) {
+        return lr.log_ret;
+    }
+
+    return fr.file_ret;
+}
+
+static int coroutine_fn
+blk_log_writes_co_do_file_pwritev(BlkLogWritesFileReq *fr)
+{
+    return bdrv_co_pwritev(fr->bs->file, fr->offset, fr->bytes,
+                           fr->qiov, fr->file_flags);
+}
+
+static int coroutine_fn
+blk_log_writes_co_do_file_pwrite_zeroes(BlkLogWritesFileReq *fr)
+{
+    return bdrv_co_pwrite_zeroes(fr->bs->file, fr->offset, fr->bytes,
+                                 fr->file_flags);
+}
+
+static int coroutine_fn blk_log_writes_co_do_file_flush(BlkLogWritesFileReq *fr)
+{
+    return bdrv_co_flush(fr->bs->file->bs);
+}
+
+static int coroutine_fn
+blk_log_writes_co_do_file_pdiscard(BlkLogWritesFileReq *fr)
+{
+    return bdrv_co_pdiscard(fr->bs->file->bs, fr->offset, fr->bytes);
+}
+
+static int coroutine_fn
+blk_log_writes_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
+                          QEMUIOVector *qiov, int flags)
+{
+    return blk_log_writes_co_log(bs, offset, bytes, qiov, flags,
+                                 blk_log_writes_co_do_file_pwritev, 0, false);
+}
+
+static int coroutine_fn
+blk_log_writes_co_pwrite_zeroes(BlockDriverState *bs, int64_t offset, int bytes,
+                                BdrvRequestFlags flags)
+{
+    return blk_log_writes_co_log(bs, offset, bytes, NULL, flags,
+                                 blk_log_writes_co_do_file_pwrite_zeroes, 0,
+                                 true);
+}
+
+static int coroutine_fn blk_log_writes_co_flush_to_disk(BlockDriverState *bs)
+{
+    return blk_log_writes_co_log(bs, 0, 0, NULL, 0,
+                                 blk_log_writes_co_do_file_flush,
+                                 LOG_FLUSH_FLAG, false);
+}
+
+static int coroutine_fn
+blk_log_writes_co_pdiscard(BlockDriverState *bs, int64_t offset, int count)
+{
+    return blk_log_writes_co_log(bs, offset, count, NULL, 0,
+                                 blk_log_writes_co_do_file_pdiscard,
+                                 LOG_DISCARD_FLAG, false);
+}
+
+static BlockDriver bdrv_blk_log_writes = {
+    .format_name            = "blklogwrites",
+    .instance_size          = sizeof(BDRVBlkLogWritesState),
+
+    .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,
+
+    .bdrv_co_preadv         = blk_log_writes_co_preadv,
+    .bdrv_co_pwritev        = blk_log_writes_co_pwritev,
+    .bdrv_co_pwrite_zeroes  = blk_log_writes_co_pwrite_zeroes,
+    .bdrv_co_flush_to_disk  = blk_log_writes_co_flush_to_disk,
+    .bdrv_co_pdiscard       = blk_log_writes_co_pdiscard,
+    .bdrv_co_block_status   = bdrv_co_block_status_from_file,
+
+    .is_filter              = true,
+};
+
+static void bdrv_blk_log_writes_init(void)
+{
+    bdrv_register(&bdrv_blk_log_writes);
+}
+
+block_init(bdrv_blk_log_writes_init);
diff --git a/MAINTAINERS b/MAINTAINERS
index 6630d691d1..4431a80860 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2052,6 +2052,12 @@ S: Supported
 F: block/quorum.c
 L: qemu-block@nongnu.org
 
+blklogwrites
+M: Ari Sundholm <ari@tuxera.com>
+L: qemu-block@nongnu.org
+S: Supported
+F: block/blklogwrites.c
+
 blkverify
 M: Stefan Hajnoczi <stefanha@redhat.com>
 L: qemu-block@nongnu.org
diff --git a/block/Makefile.objs b/block/Makefile.objs
index 899bfb5e2c..c8337bf186 100644
--- a/block/Makefile.objs
+++ b/block/Makefile.objs
@@ -5,6 +5,7 @@ block-obj-y += qed-check.o
 block-obj-y += vhdx.o vhdx-endian.o vhdx-log.o
 block-obj-y += quorum.o
 block-obj-y += parallels.o blkdebug.o blkverify.o blkreplay.o
+block-obj-y += blklogwrites.o
 block-obj-y += block-backend.o snapshot.o qapi.o
 block-obj-$(CONFIG_WIN32) += file-win32.o win32-aio.o
 block-obj-$(CONFIG_POSIX) += file-posix.o
-- 
2.13.6

[Qemu-devel] [PULL v2 06/12] block: Don't silently truncate node names

[Kevin Wolf]

If the user passes a too long node name string, we silently truncate it
to fit into BlockDriverState.node_name, i.e. to 31 characters. Apart
from surprising the user when the node has a different name than
requested, this also bypasses the check for duplicate names, so that the
same name can be assigned to multiple nodes.

Fix this by just making too long node names an error.

Reported-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c                       |  6 ++++++
 tests/qemu-iotests/051        | 15 +++++++++++++++
 tests/qemu-iotests/051.out    | 23 +++++++++++++++++++++++
 tests/qemu-iotests/051.pc.out | 23 +++++++++++++++++++++++
 4 files changed, 67 insertions(+)

diff --git a/block.c b/block.c
index 961ec97d26..ac8b3a3511 100644
--- a/block.c
+++ b/block.c
@@ -1156,6 +1156,12 @@ static void bdrv_assign_node_name(BlockDriverState *bs,
         goto out;
     }
 
+    /* Make sure that the node name isn't truncated */
+    if (strlen(node_name) >= sizeof(bs->node_name)) {
+        error_setg(errp, "Node name too long");
+        goto out;
+    }
+
     /* copy node name into the bs and insert it into the graph list */
     pstrcpy(bs->node_name, sizeof(bs->node_name), node_name);
     QTAILQ_INSERT_TAIL(&graph_bdrv_states, bs, node_list);
diff --git a/tests/qemu-iotests/051 b/tests/qemu-iotests/051
index f617e25e24..ee9c820d0f 100755
--- a/tests/qemu-iotests/051
+++ b/tests/qemu-iotests/051
@@ -100,6 +100,21 @@ run_qemu -drive file="$TEST_IMG",driver=raw,format=qcow2
 run_qemu -drive file="$TEST_IMG",driver=qcow2,format=qcow2
 
 echo
+echo === Node names ===
+echo
+
+# Maximum length: 31 characters
+run_qemu -drive file="$TEST_IMG",node-name=x123456789012345678901234567890
+run_qemu -drive file="$TEST_IMG",node-name=x1234567890123456789012345678901
+
+# First character must be alphabetic
+# Following characters alphanumeric or -._
+run_qemu -drive file="$TEST_IMG",node-name=All-Types.of_all0wed_chars
+run_qemu -drive file="$TEST_IMG",node-name=123foo
+run_qemu -drive file="$TEST_IMG",node-name=_foo
+run_qemu -drive file="$TEST_IMG",node-name=foo#12
+
+echo
 echo === Device without drive ===
 echo
 
diff --git a/tests/qemu-iotests/051.out b/tests/qemu-iotests/051.out
index dd9846d1ce..b7273505c7 100644
--- a/tests/qemu-iotests/051.out
+++ b/tests/qemu-iotests/051.out
@@ -47,6 +47,29 @@ Testing: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2
 QEMU_PROG: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2: Cannot specify both 'driver' and 'format'
 
 
+=== Node names ===
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=x123456789012345678901234567890
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) quit
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901: Node name too long
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=All-Types.of_all0wed_chars
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) quit
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=123foo
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=123foo: Invalid node name
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=_foo
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=_foo: Invalid node name
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=foo#12
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=foo#12: Invalid node name
+
+
 === Device without drive ===
 
 Testing: -device VIRTIO_SCSI -device scsi-hd
diff --git a/tests/qemu-iotests/051.pc.out b/tests/qemu-iotests/051.pc.out
index b01f9a90d7..e9257fe318 100644
--- a/tests/qemu-iotests/051.pc.out
+++ b/tests/qemu-iotests/051.pc.out
@@ -47,6 +47,29 @@ Testing: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2
 QEMU_PROG: -drive file=TEST_DIR/t.qcow2,driver=qcow2,format=qcow2: Cannot specify both 'driver' and 'format'
 
 
+=== Node names ===
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=x123456789012345678901234567890
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) quit
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=x1234567890123456789012345678901: Node name too long
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=All-Types.of_all0wed_chars
+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) quit
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=123foo
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=123foo: Invalid node name
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=_foo
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=_foo: Invalid node name
+
+Testing: -drive file=TEST_DIR/t.qcow2,node-name=foo#12
+QEMU_PROG: -drive file=TEST_DIR/t.qcow2,node-name=foo#12: Invalid node name
+
+
 === Device without drive ===
 
 Testing: -device VIRTIO_SCSI -device scsi-hd
-- 
2.13.6

[Qemu-devel] [PULL v2 07/12] block/crypto: Fix memory leak in create error path

[Kevin Wolf]

Fixes: Coverity CID 1393782
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
---
 block/crypto.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/crypto.c b/block/crypto.c
index 994172a3de..146d81c90a 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -551,7 +551,7 @@ static int coroutine_fn block_crypto_co_create_opts_luks(const char *filename,
     /* Create protocol layer */
     ret = bdrv_create_file(filename, opts, errp);
     if (ret < 0) {
-        return ret;
+        goto fail;
     }
 
     bs = bdrv_open(filename, NULL, NULL,
-- 
2.13.6

[Qemu-devel] [PULL v2 08/12] block/blklogwrites: Change log_sector_size from int64_t to uint64_t

[Kevin Wolf]

From: Ari Sundholm <ari@tuxera.com>

This was a simple oversight when working on intermediate versions
of the original patch which introduced blklogwrites.

Signed-off-by: Ari Sundholm <ari@tuxera.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/blklogwrites.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/block/blklogwrites.c b/block/blklogwrites.c
index 47093fadd6..272e11a021 100644
--- a/block/blklogwrites.c
+++ b/block/blklogwrites.c
@@ -79,7 +79,7 @@ static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
     QemuOpts *opts;
     Error *local_err = NULL;
     int ret;
-    int64_t log_sector_size;
+    uint64_t log_sector_size;
 
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
@@ -101,11 +101,9 @@ static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
     log_sector_size = qemu_opt_get_size(opts, "log-sector-size",
                                         BDRV_SECTOR_SIZE);
 
-    if (log_sector_size < 0 || log_sector_size > (1ull << 23) ||
-        !is_power_of_2(log_sector_size))
-    {
+    if (log_sector_size > (1ull << 23) || !is_power_of_2(log_sector_size)) {
         ret = -EINVAL;
-        error_setg(errp, "Invalid log sector size %"PRId64, log_sector_size);
+        error_setg(errp, "Invalid log sector size %"PRIu64, log_sector_size);
         goto fail;
     }
 
-- 
2.13.6

[Qemu-devel] [PULL v2 09/12] block/blklogwrites: Add an option for appending to an old log

[Kevin Wolf]

From: Ari Sundholm <ari@tuxera.com>

Suggested by Kevin Wolf. May be useful when testing multiple batches
of writes or doing long-term testing involving restarts of the VM.

Signed-off-by: Ari Sundholm <ari@tuxera.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qapi/block-core.json |   3 +-
 block/blklogwrites.c | 147 ++++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 135 insertions(+), 15 deletions(-)

diff --git a/qapi/block-core.json b/qapi/block-core.json
index a9eab8cab8..d1753a2ae7 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -3062,7 +3062,8 @@
 { 'struct': 'BlockdevOptionsBlklogwrites',
   'data': { 'file': 'BlockdevRef',
             'log': 'BlockdevRef',
-            '*log-sector-size': 'uint32' } }
+            '*log-sector-size': 'uint32',
+            '*log-append': 'bool' } }
 
 ##
 # @BlockdevOptionsBlkverify:
diff --git a/block/blklogwrites.c b/block/blklogwrites.c
index 272e11a021..56154e7325 100644
--- a/block/blklogwrites.c
+++ b/block/blklogwrites.c
@@ -24,6 +24,10 @@
 #define LOG_FUA_FLAG     (1 << 1)
 #define LOG_DISCARD_FLAG (1 << 2)
 #define LOG_MARK_FLAG    (1 << 3)
+#define LOG_FLAG_MASK    (LOG_FLUSH_FLAG \
+                         | LOG_FUA_FLAG \
+                         | LOG_DISCARD_FLAG \
+                         | LOG_MARK_FLAG)
 
 #define WRITE_LOG_VERSION 1ULL
 #define WRITE_LOG_MAGIC 0x6a736677736872ULL
@@ -58,6 +62,11 @@ static QemuOptsList runtime_opts = {
     .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
     .desc = {
         {
+            .name = "log-append",
+            .type = QEMU_OPT_BOOL,
+            .help = "Append to an existing log",
+        },
+        {
             .name = "log-sector-size",
             .type = QEMU_OPT_SIZE,
             .help = "Log sector size",
@@ -72,6 +81,53 @@ static inline uint32_t blk_log_writes_log2(uint32_t value)
     return 31 - clz32(value);
 }
 
+static inline bool blk_log_writes_sector_size_valid(uint32_t sector_size)
+{
+    return sector_size < (1ull << 24) && is_power_of_2(sector_size);
+}
+
+static uint64_t blk_log_writes_find_cur_log_sector(BdrvChild *log,
+                                                   uint32_t sector_size,
+                                                   uint64_t nr_entries,
+                                                   Error **errp)
+{
+    uint64_t cur_sector = 1;
+    uint64_t cur_idx = 0;
+    uint32_t sector_bits = blk_log_writes_log2(sector_size);
+    struct log_write_entry cur_entry;
+
+    while (cur_idx < nr_entries) {
+        int read_ret = bdrv_pread(log, cur_sector << sector_bits, &cur_entry,
+                                  sizeof(cur_entry));
+        if (read_ret < 0) {
+            error_setg_errno(errp, -read_ret,
+                             "Failed to read log entry %"PRIu64, cur_idx);
+            return (uint64_t)-1ull;
+        }
+
+        if (cur_entry.flags & ~cpu_to_le64(LOG_FLAG_MASK)) {
+            error_setg(errp, "Invalid flags 0x%"PRIx64" in log entry %"PRIu64,
+                       le64_to_cpu(cur_entry.flags), cur_idx);
+            return (uint64_t)-1ull;
+        }
+
+        /* Account for the sector of the entry itself */
+        ++cur_sector;
+
+        /*
+         * Account for the data of the write.
+         * For discards, this data is not present.
+         */
+        if (!(cur_entry.flags & cpu_to_le64(LOG_DISCARD_FLAG))) {
+            cur_sector += le64_to_cpu(cur_entry.nr_sectors);
+        }
+
+        ++cur_idx;
+    }
+
+    return cur_sector;
+}
+
 static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
                                Error **errp)
 {
@@ -80,6 +136,7 @@ static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
     Error *local_err = NULL;
     int ret;
     uint64_t log_sector_size;
+    bool log_append;
 
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
@@ -98,20 +155,6 @@ static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
         goto fail;
     }
 
-    log_sector_size = qemu_opt_get_size(opts, "log-sector-size",
-                                        BDRV_SECTOR_SIZE);
-
-    if (log_sector_size > (1ull << 23) || !is_power_of_2(log_sector_size)) {
-        ret = -EINVAL;
-        error_setg(errp, "Invalid log sector size %"PRIu64, log_sector_size);
-        goto fail;
-    }
-
-    s->sectorsize = log_sector_size;
-    s->sectorbits = blk_log_writes_log2(log_sector_size);
-    s->cur_log_sector = 1;
-    s->nr_entries = 0;
-
     /* Open the log file */
     s->log_file = bdrv_open_child(NULL, options, "log", bs, &child_file, false,
                                   &local_err);
@@ -121,7 +164,83 @@ static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
         goto fail;
     }
 
+    log_append = qemu_opt_get_bool(opts, "log-append", false);
+
+    if (log_append) {
+        struct log_write_super log_sb = { 0, 0, 0, 0 };
+
+        if (qemu_opt_find(opts, "log-sector-size")) {
+            ret = -EINVAL;
+            error_setg(errp, "log-append and log-sector-size are mutually "
+                       "exclusive");
+            goto fail_log;
+        }
+
+        /* Read log superblock or fake one for an empty log */
+        if (!bdrv_getlength(s->log_file->bs)) {
+            log_sb.magic      = cpu_to_le64(WRITE_LOG_MAGIC);
+            log_sb.version    = cpu_to_le64(WRITE_LOG_VERSION);
+            log_sb.nr_entries = cpu_to_le64(0);
+            log_sb.sectorsize = cpu_to_le32(BDRV_SECTOR_SIZE);
+        } else {
+            ret = bdrv_pread(s->log_file, 0, &log_sb, sizeof(log_sb));
+            if (ret < 0) {
+                error_setg_errno(errp, -ret, "Could not read log superblock");
+                goto fail_log;
+            }
+        }
+
+        if (log_sb.magic != cpu_to_le64(WRITE_LOG_MAGIC)) {
+            ret = -EINVAL;
+            error_setg(errp, "Invalid log superblock magic");
+            goto fail_log;
+        }
+
+        if (log_sb.version != cpu_to_le64(WRITE_LOG_VERSION)) {
+            ret = -EINVAL;
+            error_setg(errp, "Unsupported log version %"PRIu64,
+                       le64_to_cpu(log_sb.version));
+            goto fail_log;
+        }
+
+        log_sector_size = le32_to_cpu(log_sb.sectorsize);
+        s->cur_log_sector = 1;
+        s->nr_entries = 0;
+
+        if (blk_log_writes_sector_size_valid(log_sector_size)) {
+            s->cur_log_sector =
+                blk_log_writes_find_cur_log_sector(s->log_file, log_sector_size,
+                                    le64_to_cpu(log_sb.nr_entries), &local_err);
+            if (local_err) {
+                ret = -EINVAL;
+                error_propagate(errp, local_err);
+                goto fail_log;
+            }
+
+            s->nr_entries = le64_to_cpu(log_sb.nr_entries);
+        }
+    } else {
+        log_sector_size = qemu_opt_get_size(opts, "log-sector-size",
+                                            BDRV_SECTOR_SIZE);
+        s->cur_log_sector = 1;
+        s->nr_entries = 0;
+    }
+
+    if (!blk_log_writes_sector_size_valid(log_sector_size)) {
+        ret = -EINVAL;
+        error_setg(errp, "Invalid log sector size %"PRIu64, log_sector_size);
+        goto fail_log;
+    }
+
+    s->sectorsize = log_sector_size;
+    s->sectorbits = blk_log_writes_log2(log_sector_size);
+
     ret = 0;
+fail_log:
+    if (ret < 0) {
+        bdrv_unref_child(bs, s->log_file);
+        s->log_file = NULL;
+    }
 fail:
     if (ret < 0) {
         bdrv_unref_child(bs, bs->file);
-- 
2.13.6

[Qemu-devel] [PULL v2 10/12] block/blklogwrites: Add an option for the update interval of the log superblock

[Kevin Wolf]

From: Ari Sundholm <ari@tuxera.com>

This is a way to ensure that the log superblock is periodically
updated. Before, this was only done on flush requests, which may
not be enough if the VM exits abnormally, omitting the final flush.

The default interval is 4096 write requests.

Signed-off-by: Ari Sundholm <ari@tuxera.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 qapi/block-core.json |  6 +++++-
 block/blklogwrites.c | 20 ++++++++++++++++++--
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/qapi/block-core.json b/qapi/block-core.json
index d1753a2ae7..38b31250f9 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -3057,13 +3057,17 @@
 # @log-sector-size: sector size used in logging writes to @file, determines
 #                   granularity of offsets and sizes of writes (default: 512)
 #
+# @log-super-update-interval: interval of write requests after which the log
+#                             super block is updated to disk (default: 4096)
+#
 # Since: 3.0
 ##
 { 'struct': 'BlockdevOptionsBlklogwrites',
   'data': { 'file': 'BlockdevRef',
             'log': 'BlockdevRef',
             '*log-sector-size': 'uint32',
-            '*log-append': 'bool' } }
+            '*log-append': 'bool',
+            '*log-super-update-interval': 'uint64' } }
 
 ##
 # @BlockdevOptionsBlkverify:
diff --git a/block/blklogwrites.c b/block/blklogwrites.c
index 56154e7325..63bf6b34a9 100644
--- a/block/blklogwrites.c
+++ b/block/blklogwrites.c
@@ -55,6 +55,7 @@ typedef struct {
     uint32_t sectorbits;
     uint64_t cur_log_sector;
     uint64_t nr_entries;
+    uint64_t update_interval;
 } BDRVBlkLogWritesState;
 
 static QemuOptsList runtime_opts = {
@@ -71,6 +72,11 @@ static QemuOptsList runtime_opts = {
             .type = QEMU_OPT_SIZE,
             .help = "Log sector size",
         },
+        {
+            .name = "log-super-update-interval",
+            .type = QEMU_OPT_NUMBER,
+            .help = "Log superblock update interval (# of write requests)",
+        },
         { /* end of list */ }
     },
 };
@@ -234,6 +240,14 @@ static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
 
     s->sectorsize = log_sector_size;
     s->sectorbits = blk_log_writes_log2(log_sector_size);
+    s->update_interval = qemu_opt_get_number(opts, "log-super-update-interval",
+                                             4096);
+    if (!s->update_interval) {
+        ret = -EINVAL;
+        error_setg(errp, "Invalid log superblock update interval %"PRIu64,
+                   s->update_interval);
+        goto fail_log;
+    }
 
     ret = 0;
 fail_log:
@@ -360,8 +374,10 @@ static void coroutine_fn blk_log_writes_co_do_log(BlkLogWritesLogReq *lr)
                                             lr->zero_size, 0);
     }
 
-    /* Update super block on flush */
-    if (lr->log_ret == 0 && lr->entry.flags & LOG_FLUSH_FLAG) {
+    /* Update super block on flush or every update interval */
+    if (lr->log_ret == 0 && ((lr->entry.flags & LOG_FLUSH_FLAG)
+        || (s->nr_entries % s->update_interval == 0)))
+    {
         struct log_write_super super = {
             .magic      = cpu_to_le64(WRITE_LOG_MAGIC),
             .version    = cpu_to_le64(WRITE_LOG_VERSION),
-- 
2.13.6

[Qemu-devel] [PULL v2 11/12] file-posix: Fix creation locking

[Kevin Wolf]

From: Max Reitz <mreitz@redhat.com>

raw_apply_lock_bytes() takes a bit mask of "permissions that are NOT
shared".

Also, make the "perm" and "shared" variables uint64_t, because I do not
particularly like using ~ on signed integers (and other permission masks
are usually uint64_t, too).

Reported-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/file-posix.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/file-posix.c b/block/file-posix.c
index 829ee538d8..b57c58e80f 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -2112,7 +2112,7 @@ raw_co_create(BlockdevCreateOptions *options, Error **errp)
 {
     BlockdevCreateOptionsFile *file_opts;
     int fd;
-    int perm, shared;
+    uint64_t perm, shared;
     int result = 0;
 
     /* Validate options and set default values */
@@ -2148,7 +2148,7 @@ raw_co_create(BlockdevCreateOptions *options, Error **errp)
     shared = BLK_PERM_ALL & ~BLK_PERM_RESIZE;
 
     /* Step one: Take locks */
-    result = raw_apply_lock_bytes(fd, perm, shared, false, errp);
+    result = raw_apply_lock_bytes(fd, perm, ~shared, false, errp);
     if (result < 0) {
         goto out_close;
     }
-- 
2.13.6

[Qemu-devel] [PULL v2 12/12] file-posix: Unlock FD after creation

[Kevin Wolf]

From: Max Reitz <mreitz@redhat.com>

Closing the FD does not necessarily mean that it is unlocked.  Fix this
by relinquishing all permission locks before qemu_close().

Reported-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/file-posix.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/block/file-posix.c b/block/file-posix.c
index b57c58e80f..98987b80f1 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -2111,6 +2111,7 @@ static int coroutine_fn
 raw_co_create(BlockdevCreateOptions *options, Error **errp)
 {
     BlockdevCreateOptionsFile *file_opts;
+    Error *local_err = NULL;
     int fd;
     uint64_t perm, shared;
     int result = 0;
@@ -2156,13 +2157,13 @@ raw_co_create(BlockdevCreateOptions *options, Error **errp)
     /* Step two: Check that nobody else has taken conflicting locks */
     result = raw_check_lock_bytes(fd, perm, shared, errp);
     if (result < 0) {
-        goto out_close;
+        goto out_unlock;
     }
 
     /* Clear the file by truncating it to 0 */
     result = raw_regular_truncate(NULL, fd, 0, PREALLOC_MODE_OFF, errp);
     if (result < 0) {
-        goto out_close;
+        goto out_unlock;
     }
 
     if (file_opts->nocow) {
@@ -2185,7 +2186,17 @@ raw_co_create(BlockdevCreateOptions *options, Error **errp)
     result = raw_regular_truncate(NULL, fd, file_opts->size,
                                   file_opts->preallocation, errp);
     if (result < 0) {
-        goto out_close;
+        goto out_unlock;
+    }
+
+out_unlock:
+    raw_apply_lock_bytes(fd, 0, 0, true, &local_err);
+    if (local_err) {
+        /* The above call should not fail, and if it does, that does
+         * not mean the whole creation operation has failed.  So
+         * report it the user for their convenience, but do not report
+         * it to the caller. */
+        error_report_err(local_err);
     }
 
 out_close:
-- 
2.13.6

Re: [Qemu-devel] [PULL v2 00/12] Block layer patches

[Peter Maydell]

On 5 July 2018 at 11:25, Kevin Wolf <kwolf@redhat.com> wrote:
> The following changes since commit fe8d2d5737ab20ed0118863f5eb888cae37122ab:
>
>   Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-3.0-pull-request' into staging (2018-07-04 22:38:10 +0100)
>
> are available in the git repository at:
>
>   git://repo.or.cz/qemu/kevin.git tags/for-upstream
>
> for you to fetch changes up to 7c20c808a5cbf5d244735bc78fc3138c739c1946:
>
>   file-posix: Unlock FD after creation (2018-07-05 11:07:58 +0200)
>
> ----------------------------------------------------------------
> Block layer patches:
>
> - qcow2: Use worker threads for compression to improve performance of
>   'qemu-img convert -W' and compressed backup jobs
> - blklogwrites: New filter driver to log write requests to an image in
>   the dm-log-writes format
> - file-posix: Fix image locking during image creation
> - crypto: Fix memory leak in error path
> - Error out instead of silently truncating node names
>

Applied, thanks.

-- PMM

Re: [Qemu-devel] [PULL v2 09/12] block/blklogwrites: Add an option for appending to an old log

[Eric Blake]

On 07/05/2018 05:26 AM, Kevin Wolf wrote:
> From: Ari Sundholm <ari@tuxera.com>
> 
> Suggested by Kevin Wolf. May be useful when testing multiple batches
> of writes or doing long-term testing involving restarts of the VM.
> 
> Signed-off-by: Ari Sundholm <ari@tuxera.com>
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> ---
>   qapi/block-core.json |   3 +-
>   block/blklogwrites.c | 147 ++++++++++++++++++++++++++++++++++++++++++++++-----
>   2 files changed, 135 insertions(+), 15 deletions(-)
> 
> diff --git a/qapi/block-core.json b/qapi/block-core.json
> index a9eab8cab8..d1753a2ae7 100644
> --- a/qapi/block-core.json
> +++ b/qapi/block-core.json
> @@ -3062,7 +3062,8 @@
>   { 'struct': 'BlockdevOptionsBlklogwrites',
>     'data': { 'file': 'BlockdevRef',
>               'log': 'BlockdevRef',
> -            '*log-sector-size': 'uint32' } }
> +            '*log-sector-size': 'uint32',
> +            '*log-append': 'bool' } }

Missing documentation (including the default value) of the new member. 
Since this is already pulled, please submit a followup patch.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

Re: [Qemu-devel] [PULL v2 09/12] block/blklogwrites: Add an option for appending to an old log

[Ari Sundholm]

On 07/05/2018 07:06 PM, Eric Blake wrote:
> On 07/05/2018 05:26 AM, Kevin Wolf wrote:
>> From: Ari Sundholm <ari@tuxera.com>
>>
>> Suggested by Kevin Wolf. May be useful when testing multiple batches
>> of writes or doing long-term testing involving restarts of the VM.
>>
>> Signed-off-by: Ari Sundholm <ari@tuxera.com>
>> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
>> ---
>>   qapi/block-core.json |   3 +-
>>   block/blklogwrites.c | 147 
>> ++++++++++++++++++++++++++++++++++++++++++++++-----
>>   2 files changed, 135 insertions(+), 15 deletions(-)
>>
>> diff --git a/qapi/block-core.json b/qapi/block-core.json
>> index a9eab8cab8..d1753a2ae7 100644
>> --- a/qapi/block-core.json
>> +++ b/qapi/block-core.json
>> @@ -3062,7 +3062,8 @@
>>   { 'struct': 'BlockdevOptionsBlklogwrites',
>>     'data': { 'file': 'BlockdevRef',
>>               'log': 'BlockdevRef',
>> -            '*log-sector-size': 'uint32' } }
>> +            '*log-sector-size': 'uint32',
>> +            '*log-append': 'bool' } }
> 
> Missing documentation (including the default value) of the new member. 
> Since this is already pulled, please submit a followup patch.
> 

I somehow missed your message. Sorry.

Thanks for spotting this. I just sent a patch to add the missing 
documentation.

Thanks,
Ari Sundholm
ari@tuxera.com