diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2017-03-08 15:07:12 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2017-03-13 12:49:33 +0100 |
| commit | 91965658664cc5da412049de0dd309d50ac09917 (patch) | |
| tree | 47a71dfa67562574b98ab8b58dca2a01c6facfc7 | |
| parent | b64aa441955b9aa72a05456650303015ac2bea28 (diff) | |
commit: Implement bdrv_commit_top.bdrv_co_get_block_status
In some cases, bdrv_co_get_block_status() is called recursively for the
whole backing chain. The automatically inserted bdrv_commit_top filter
driver must not stop the recursion, so implement a callback that simply
forwards the request to bs->backing.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
| -rw-r--r-- | block/commit.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/block/commit.c b/block/commit.c index 9c4198837f..932d1e6046 100644 --- a/block/commit.c +++ b/block/commit.c @@ -232,6 +232,17 @@ static int coroutine_fn bdrv_commit_top_preadv(BlockDriverState *bs, return bdrv_co_preadv(bs->backing, offset, bytes, qiov, flags); } +static int64_t coroutine_fn bdrv_commit_top_get_block_status( + BlockDriverState *bs, int64_t sector_num, int nb_sectors, int *pnum, + BlockDriverState **file) +{ + *pnum = nb_sectors; + *file = bs->backing->bs; + return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA | + (sector_num << BDRV_SECTOR_BITS); +} + + static void bdrv_commit_top_close(BlockDriverState *bs) { } @@ -248,10 +259,11 @@ static void bdrv_commit_top_child_perm(BlockDriverState *bs, BdrvChild *c, /* Dummy node that provides consistent read to its users without requiring it * from its backing file and that allows writes on the backing file chain. */ static BlockDriver bdrv_commit_top = { - .format_name = "commit_top", - .bdrv_co_preadv = bdrv_commit_top_preadv, - .bdrv_close = bdrv_commit_top_close, - .bdrv_child_perm = bdrv_commit_top_child_perm, + .format_name = "commit_top", + .bdrv_co_preadv = bdrv_commit_top_preadv, + .bdrv_co_get_block_status = bdrv_commit_top_get_block_status, + .bdrv_close = bdrv_commit_top_close, + .bdrv_child_perm = bdrv_commit_top_child_perm, }; void commit_start(const char *job_id, BlockDriverState *bs, |