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file-posix: Support BDRV_REQ_ZERO_WRITE for truncate

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For regular files, we always get BDRV_REQ_ZERO_WRITE behaviour from the
OS, so we can advertise the flag and just ignore it.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200424125448.63318-7-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2020-04-24 14:54:44 +02:00
parent 1ddaabaecb
commit 2f0c6e7a65
1 changed files with 4 additions and 0 deletions
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4
block/file-posix.c
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@ -702,6 +702,10 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
#endif
bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK;
if (S_ISREG(st.st_mode)) {
/* When extending regular files, we get zeros from the OS */
bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE;
}
ret = 0;
fail:
if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {