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49228d1e95
qemu/block
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Eric Blake 49228d1e95 block: Return -ENOTSUP rather than assert on unaligned discards 
Right now, the block layer rounds discard requests, so that
individual drivers are able to assert that discard requests
will never be unaligned.  But there are some ISCSI devices
that track and coalesce multiple unaligned requests, turning it
into an actual discard if the requests eventually cover an
entire page, which implies that it is better to always pass
discard requests as low down the stack as possible.

In isolation, this patch has no semantic effect, since the
block layer currently never passes an unaligned request through.
But the block layer already has code that silently ignores
drivers that return -ENOTSUP for a discard request that cannot
be honored (as well as drivers that return 0 even when nothing
was done).  But the next patch will update the block layer to
fragment discard requests, so that clients are guaranteed that
they are either dealing with an unaligned head or tail, or an
aligned core, making it similar to the block layer semantics of
write zero fragmentation.

CC: qemu-stable@nongnu.org
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2016-11-22 15:59:22 +01:00
..
accounting.c block: Clean up includes 2016-01-20 13:36:23 +01:00
archipelago.c block: use aio_bh_schedule_oneshot 2016-10-07 13:34:07 +02:00
backup.c blockjob: refactor backup_start as backup_job_create 2016-11-14 22:47:34 -05:00
blkdebug.c block: use aio_bh_schedule_oneshot 2016-10-07 13:34:07 +02:00
blkreplay.c replay: allow replay stopping and restarting 2016-09-27 11:57:30 +02:00
blkverify.c block: use aio_bh_schedule_oneshot 2016-10-07 13:34:07 +02:00
block-backend.c block-backend: Always notify on blk_eject 2016-11-14 11:15:54 -05:00
bochs.c block: Convert bdrv_co_preadv/pwritev to BdrvChild 2016-07-05 16:46:27 +02:00
cloop.c block: Convert bdrv_pread(v) to BdrvChild 2016-07-05 16:46:27 +02:00
commit.c blockjob: add block_job_start 2016-11-14 22:47:34 -05:00
crypto.c crypto: make PBKDF iterations configurable for LUKS format 2016-09-19 16:30:45 +01:00
curl.c block/curl: Do not wait for data beyond EOF 2016-11-14 22:47:34 -05:00
dirty-bitmap.c block: More operations for meta dirty bitmap 2016-10-24 17:56:07 +02:00
dmg-bz2.c dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
dmg.c dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
dmg.h dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
gluster.c gluster: Fix use after free in glfs_clear_preopened() 2016-11-21 17:04:43 -05:00
io.c block: Let write zeroes fallback work even with small max_transfer 2016-11-22 15:59:22 +01:00
iscsi.c block: Return -ENOTSUP rather than assert on unaligned discards 2016-11-22 15:59:22 +01:00
linux-aio.c linux-aio: fix re-entrant completion processing 2016-09-28 17:11:23 +01:00
Makefile.objs dmg: Move libbz2 code to dmg-bz2.so 2016-10-07 14:14:06 +02:00
mirror.c mirror: do not flush every time the disks are synced 2016-11-14 22:49:26 -05:00
nbd-client.c nbd: Implement NBD_CMD_WRITE_ZEROES on client 2016-11-02 09:28:56 +01:00
nbd-client.h nbd: Implement NBD_CMD_WRITE_ZEROES on client 2016-11-02 09:28:56 +01:00
nbd.c block/nbd: Fix the leaked visitor 2016-11-11 15:54:55 +01:00
nfs.c nfs: Fix memory leak in nfs_file_create() 2016-11-11 15:54:55 +01:00
null.c block: use aio_bh_schedule_oneshot 2016-10-07 13:34:07 +02:00
parallels.c block/parallels: check new image size 2016-08-05 09:59:06 +01:00
qapi.c qapi: rename QmpOutputVisitor to QObjectOutputVisitor 2016-10-25 16:25:54 +02:00
qcow2-cache.c block: Convert bdrv_pwrite(v/_sync) to BdrvChild 2016-07-05 16:46:27 +02:00
qcow2-cluster.c qcow2: Support BDRV_REQ_MAY_UNMAP 2016-10-24 17:54:03 +02:00
qcow2-refcount.c block: Convert bdrv_discard() to byte-based 2016-07-20 14:11:55 +01:00
qcow2-snapshot.c block: Convert bdrv_pwrite(v/_sync) to BdrvChild 2016-07-05 16:46:27 +02:00
qcow2.c block: Return -ENOTSUP rather than assert on unaligned discards 2016-11-22 15:59:22 +01:00
qcow2.h qcow2: Remove stale FIXME comment 2016-11-11 15:54:55 +01:00
qcow.c crypto: extend mode as a parameter in qcrypto_cipher_supports() 2016-10-19 10:09:24 +01:00
qed-check.c qed: Use DIV_ROUND_UP 2016-06-07 18:19:24 +03:00
qed-cluster.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-gencb.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-l2-cache.c block: Clean up includes 2016-01-20 13:36:23 +01:00
qed-table.c block: introduce BDRV_POLL_WHILE 2016-10-28 21:50:18 +08:00
qed.c qed: Implement .bdrv_drain 2016-10-28 21:50:18 +08:00
qed.h block: use aio_bh_schedule_oneshot 2016-10-07 13:34:07 +02:00
quorum.c quorum: do not allocate multiple iovecs for FIFO strategy 2016-10-24 17:56:06 +02:00
raw_bsd.c raw_bsd: don't check size alignment when only offset is set 2016-11-11 15:54:55 +01:00
raw-posix.c raw-posix: Rename 'raw_s' to 'rs' 2016-11-11 15:56:22 +01:00
raw-win32.c block: improve error handling in raw_open 2016-10-24 17:54:03 +02:00
rbd.c rbd: make the code more readable 2016-11-01 07:55:57 -04:00
replication.c blockjob: refactor backup_start as backup_job_create 2016-11-14 22:47:34 -05:00
sheepdog.c block: Return -ENOTSUP rather than assert on unaligned discards 2016-11-22 15:59:22 +01:00
snapshot.c error: Remove NULL checks on error_propagate() calls 2016-06-20 16:38:13 +02:00
ssh.c block/ssh: Code cleanup for unused parameter 2016-11-11 15:54:55 +01:00
stream.c blockjob: add block_job_start 2016-11-14 22:47:34 -05:00
throttle-groups.c throttle: Correct access to wrong BlockBackendPublic structures 2016-10-24 17:54:03 +02:00
trace-events blockjob: add block_job_start 2016-11-14 22:47:34 -05:00
vdi.c vdi: Use QEMU UUID API 2016-09-23 11:42:52 +08:00
vhdx-endian.c vhdx: Use QEMU UUID API 2016-09-23 11:42:52 +08:00
vhdx-log.c block: Convert bdrv_pwrite(v/_sync) to BdrvChild 2016-07-05 16:46:27 +02:00
vhdx.c vhdx: Use QEMU UUID API 2016-09-23 11:42:52 +08:00
vhdx.h block: vhdx - update PAYLOAD_BLOCK_UNMAPPED value to match 1.00 spec 2014-12-12 15:42:22 +00:00
vmdk.c vmdk: add vmdk_co_pwritev_compressed 2016-09-05 19:06:48 +02:00
vpc.c vpc: Use QEMU UUID API 2016-09-23 11:42:52 +08:00
vvfat.c block: Add "read-only" to the options QDict 2016-09-23 13:36:10 +02:00
win32-aio.c linux-aio: share one LinuxAioState within an AioContext 2016-07-18 15:09:31 +01:00
write-threshold.c block: use bdrv_add_before_write_notifier 2016-10-07 13:34:07 +02:00