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| author | Kevin Wolf <kwolf@redhat.com> | 2015-06-09 10:45:16 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-06-12 15:54:01 +0200 |
| commit | b8684454e152ca2e100f4b59d80de2be27186206 (patch) | |
| tree | 6c4460e2196217cbb27c53a8f194f99a6117aef5 | |
| parent | 90df601f06de14f062d2e8dc1bc57f0decf86fd1 (diff) | |
| download | qemu-b8684454e152ca2e100f4b59d80de2be27186206.zip qemu-b8684454e152ca2e100f4b59d80de2be27186206.tar.gz qemu-b8684454e152ca2e100f4b59d80de2be27186206.tar.bz2 | |
raw-posix: Fix .bdrv_co_get_block_status() for unaligned image size
Image files with an unaligned image size have a final hole that starts
at EOF, i.e. in the middle of a sector. Currently, *pnum == 0 is
returned when checking the status of this sector. In qemu-img, this
triggers an assertion failure.
In order to fix this, one type for the sector that contains EOF must be
found. Treating a hole as data is safe, so this patch rounds the
calculated number of data sectors up, so that a partial sector at EOF is
treated as a full data sector.
This fixes https://bugzilla.redhat.com/show_bug.cgi?id=1229394
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Tested-by: Cole Robinson <crobinso@redhat.com>
| -rw-r--r-- | block/raw-posix.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/block/raw-posix.c b/block/raw-posix.c index 2990e95..44ade8c 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -1848,8 +1848,9 @@ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs, *pnum = nb_sectors; ret = BDRV_BLOCK_DATA; } else if (data == start) { - /* On a data extent, compute sectors to the end of the extent. */ - *pnum = MIN(nb_sectors, (hole - start) / BDRV_SECTOR_SIZE); + /* On a data extent, compute sectors to the end of the extent, + * possibly including a partial sector at EOF. */ + *pnum = MIN(nb_sectors, DIV_ROUND_UP(hole - start, BDRV_SECTOR_SIZE)); ret = BDRV_BLOCK_DATA; } else { /* On a hole, compute sectors to the beginning of the next extent. */ |