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Kevin Wolf 61b3043965 qcow2: Implement v2 zero writes with discard if possible 
qcow2 version 2 images don't support the zero flag for clusters, so for
write_zeroes requests, we return -ENOTSUP and get explicit zero buffer
writes. If the image doesn't have a backing file, we can do better: Just
discard the respective clusters.

This is relevant for 'qemu-img convert -O qcow2 -n', where qemu-img has
to assume that the existing target image may contain any data, so it has
to write zeroes. Without this patch, this results in a fully allocated
target image, even if the source image was empty.

Reported-by: Nir Soffer <nsoffer@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200721135520.72355-2-kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2020-07-21 16:28:57 +02:00
..
monitor
blockdev: Split off basic bitmap operations for qemu-img
2020-05-19 10:32:14 -05:00
accounting.c
block: add empty account cookie type
2019-10-10 10:56:18 +02:00
aio_task.c
block: introduce aio task pool
2019-10-10 10:56:17 +02:00
amend.c
block/core: add generic infrastructure for x-blockdev-amend qmp command
2020-07-06 08:49:28 +02:00
backup-top.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
backup-top.h
block: introduce backup-top filter driver
2019-10-10 10:56:18 +02:00
backup.c
backup: Make sure that source and target size match
2020-05-08 13:26:35 +02:00
blkdebug.c
error: Eliminate error_propagate() with Coccinelle, part 2
2020-07-10 15:18:08 +02:00
blklogwrites.c
error: Eliminate error_propagate() with Coccinelle, part 2
2020-07-10 15:18:08 +02:00
blkreplay.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
blkverify.c
error: Eliminate error_propagate() with Coccinelle, part 2
2020-07-10 15:18:08 +02:00
block-backend.c
block: Avoid stale pointer dereference in blk_get_aio_context()
2020-07-14 15:24:15 +02:00
block-copy.c
block/block-copy: block_copy_dirty_clusters: fix failure check
2020-07-06 08:33:06 +02:00
bochs.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
cloop.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
commit.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
copy-on-read.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
create.c
block/create: Do not abort if a block driver is not available
2019-09-13 12:18:37 +02:00
crypto.c
error: Eliminate error_propagate() with Coccinelle, part 2
2020-07-10 15:18:08 +02:00
crypto.h
block/crypto: implement the encryption key management
2020-07-06 08:49:28 +02:00
curl.c
error: Eliminate error_propagate() with Coccinelle, part 1
2020-07-10 15:18:08 +02:00
dirty-bitmap.c
block/dirty-bitmap: add bdrv_has_named_bitmaps helper
2020-05-28 13:15:22 -05:00
dmg-bz2.c
…
dmg-lzfse.c
…
dmg.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
dmg.h
…
file-posix.c
file-posix: Handle EINVAL fallocate return value
2020-07-21 16:28:57 +02:00
file-win32.c
error: Eliminate error_propagate() with Coccinelle, part 2
2020-07-10 15:18:08 +02:00
filter-compress.c
block: Use bdrv_default_perms()
2020-05-18 19:05:25 +02:00
gluster.c
error: Reduce unnecessary error propagation
2020-07-10 15:18:08 +02:00
io_uring.c
io_uring: use io_uring_cq_ready() to check for ready cqes
2020-06-05 09:54:48 +01:00
io.c
block: drop unallocated_blocks_are_zero
2020-07-06 10:34:14 +02:00
iscsi-opts.c
…
iscsi.c
iscsi: return -EIO when sense fields are meaningless
2020-07-10 18:02:23 -04:00
linux-aio.c
misc: Replace zero-length arrays with flexible array member (automatic)
2020-03-16 22:07:42 +01:00
Makefile.objs
Remove VXHS block device
2020-07-17 14:20:57 +02:00
mirror.c
block: Drop @child_class from bdrv_child_perm()
2020-05-18 19:05:25 +02:00
nbd.c
nbd: Avoid off-by-one in long export name truncation
2020-07-13 09:01:01 -05:00
nfs.c
qapi: Smooth another visitor error checking pattern
2020-07-10 15:18:08 +02:00
null.c
replay: add BH oneshot event for block layer
2019-10-14 17:12:48 +02:00
nvme.c
block/nvme: support nested aio_poll()
2020-06-23 15:46:08 +01:00
parallels.c
error: Avoid error_propagate() after migrate_add_blocker()
2020-07-10 15:18:08 +02:00
parallels.h
…
qapi-sysemu.c
block: Move system emulator QMP commands to block/qapi-sysemu.c
2020-03-06 17:15:38 +01:00
qapi.c
block: Fix VM size field width in snapshot dump
2020-02-20 16:43:42 +01:00
qcow2-bitmap.c
qcow2: Tweak comments on qcow2_get_persistent_dirty_bitmap_size
2020-06-17 14:53:39 +02:00
qcow2-cache.c
core: replace getpagesize() with qemu_real_host_page_size
2019-10-26 15:38:06 +02:00
qcow2-cluster.c
qcow2: Implement v2 zero writes with discard if possible
2020-07-21 16:28:57 +02:00
qcow2-refcount.c
block: Comment cleanups
2020-05-05 13:17:36 +02:00
qcow2-snapshot.c
qcow2: Allow resize of images with internal snapshots
2020-05-05 13:17:36 +02:00
qcow2-threads.c
qcow2: add zstd cluster compression
2020-05-13 14:20:31 +02:00
qcow2.c
block: Add support to warn on backing file change without format
2020-07-14 15:18:59 +02:00
qcow2.h
qcow2: Expose bitmaps' size during measure
2020-05-28 13:16:16 -05:00
qcow.c
qcow: Tolerate backing_fmt=
2020-07-14 15:18:59 +02:00
qed-check.c
…
qed-cluster.c
…
qed-l2-cache.c
…
qed-table.c
…
qed.c
qapi: Smooth another visitor error checking pattern
2020-07-10 15:18:08 +02:00
qed.h
qed: Simplify backing reads
2020-07-06 10:34:14 +02:00
quorum.c
error: Reduce unnecessary error propagation
2020-07-10 15:18:08 +02:00
raw-format.c
error: Eliminate error_propagate() with Coccinelle, part 2
2020-07-10 15:18:08 +02:00
rbd.c
qapi: Smooth another visitor error checking pattern
2020-07-10 15:18:08 +02:00
replication.c
error: Reduce unnecessary error propagation
2020-07-10 15:18:08 +02:00
sheepdog.c
sheepdog: Add trivial backing_fmt support
2020-07-14 15:18:59 +02:00
snapshot.c
block/snapshot: rename Error ** parameter to more common errp
2019-12-18 08:43:19 +01:00
ssh.c
qapi: Smooth another visitor error checking pattern
2020-07-10 15:18:08 +02:00
stream.c
block: Add support to warn on backing file change without format
2020-07-14 15:18:59 +02:00
throttle-groups.c
error: Eliminate error_propagate() with Coccinelle, part 1
2020-07-10 15:18:08 +02:00
throttle.c
error: Eliminate error_propagate() with Coccinelle, part 2
2020-07-10 15:18:08 +02:00
trace-events
Remove VXHS block device
2020-07-17 14:20:57 +02:00
vdi.c
error: Avoid error_propagate() after migrate_add_blocker()
2020-07-10 15:18:08 +02:00
vhdx-endian.c
…
vhdx-log.c
block: Add flags to bdrv(_co)_truncate()
2020-04-30 17:51:07 +02:00
vhdx.c
error: Avoid error_propagate() after migrate_add_blocker()
2020-07-10 15:18:08 +02:00
vhdx.h
…
vmdk.c
vmdk: Add trivial backing_fmt support
2020-07-14 15:18:59 +02:00
vpc.c
error: Avoid error_propagate() after migrate_add_blocker()
2020-07-10 15:18:08 +02:00
vvfat.c
error: Avoid error_propagate() after migrate_add_blocker()
2020-07-10 15:18:08 +02:00
win32-aio.c
…
write-threshold.c
…