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file-posix: Remove unused s->discard_zeroes

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The field is unused (only ever set, but never read) since commit
ac9185603. Additionally, the commit message of commit 34fa110e already
explained earlier why it's unreliable. Remove it.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20220923142838.91043-1-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2022-09-23 16:28:38 +02:00
parent 9bd4d3c2e3
commit a7ca2eb488
1 changed files with 0 additions and 9 deletions
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9
block/file-posix.c
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@ -154,7 +154,6 @@ typedef struct BDRVRawState {
bool has_discard:1;
bool has_write_zeroes:1;
bool discard_zeroes:1;
bool use_linux_aio:1;
bool use_linux_io_uring:1;
int page_cache_inconsistent; /* errno from fdatasync failure */
@ -755,7 +754,6 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
ret = -EINVAL;
goto fail;
} else {
s->discard_zeroes = true;
s->has_fallocate = true;
}
} else {
@ -769,19 +767,12 @@ static int raw_open_common(BlockDriverState *bs, QDict *options,
}
if (S_ISBLK(st.st_mode)) {
#ifdef BLKDISCARDZEROES
unsigned int arg;
if (ioctl(s->fd, BLKDISCARDZEROES, &arg) == 0 && arg) {
s->discard_zeroes = true;
}
#endif
#ifdef __linux__
/* On Linux 3.10, BLKDISCARD leaves stale data in the page cache. Do
* not rely on the contents of discarded blocks unless using O_DIRECT.
* Same for BLKZEROOUT.
*/
if (!(bs->open_flags & BDRV_O_NOCACHE)) {
s->discard_zeroes = false;
s->has_write_zeroes = false;
}
#endif