Using fiemap without FIEMAP_FLAG_SYNC is a known corrupter.
Add the FIEMAP_FLAG_SYNC flag to the FS_IOC_FIEMAP ioctl. This has
the downside of significantly reducing performance.
Reported-By: Michael Steffens <michael_steff...@posteo.de>
Signed-off-by: Tony Breeds <t...@bakeyournoodle.com>
Cc: Kevin Wolf <kw...@redhat.com>
Cc: Markus Armbruster <arm...@redhat.com>
Cc: Stefan Hajnoczi <stefa...@redhat.com>
Cc: Max Reitz <mre...@redhat.com>
Cc: Pádraig Brady <pbr...@redhat.com>
Cc: Eric Blake <ebl...@redhat.com>
---
Changes since v1:
- split in to 2 patches
- tried to make the commit messages better
block/raw-posix.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index a253697..b8203e9 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1472,7 +1472,7 @@ static int64_t try_fiemap(BlockDriverState *bs, off_t
start, off_t *data,
f.fm.fm_start = start;
f.fm.fm_length = (int64_t)nb_sectors * BDRV_SECTOR_SIZE;
- f.fm.fm_flags = 0;
+ f.fm.fm_flags = FIEMAP_FLAG_SYNC;
f.fm.fm_extent_count = 1;
f.fm.fm_reserved = 0;
if (ioctl(s->fd, FS_IOC_FIEMAP, &f) == -1) {
--
1.9.3
