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| author | Eric Blake <eblake@redhat.com> | 2020-04-28 15:29:00 -0500 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2020-05-08 13:26:35 +0200 |
| commit | 2f98910d5b89733b1a5df06c6d2a7056da32a7b7 (patch) | |
| tree | 0180454d051879f62437a25eaf286049b338d8f0 /block/rbd.c | |
| parent | 8f23aaf5d6a5458e251c5d5d0555d9e515355e35 (diff) | |
| download | qemu-2f98910d5b89733b1a5df06c6d2a7056da32a7b7.zip | |
rbd: Support BDRV_REQ_ZERO_WRITE for truncate
Our .bdrv_has_zero_init_truncate always returns 1 because rbd always
0-fills; we can use that same knowledge to implement
BDRV_REQ_ZERO_WRITE by ignoring it.
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200428202905.770727-5-eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/rbd.c')
| -rw-r--r-- | block/rbd.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/rbd.c b/block/rbd.c index f2d52091c7..331c45adb2 100644 --- a/block/rbd.c +++ b/block/rbd.c @@ -817,6 +817,9 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags, } } + /* When extending regular files, we get zeros from the OS */ + bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE; + r = 0; goto out; |