openkylin
/
qemu
mirror of https://gitee.com/openkylin/qemu.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

raw-posix: raw_co_get_block_status() return value 

Instead of generating the full return value thrice in try_fiemap(),
try_seek_hole() and as a fall-back in raw_co_get_block_status() itself,
generate the value only in raw_co_get_block_status().

While at it, also remove the pnum parameter from try_fiemap() and
try_seek_hole().

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 1414148280-17949-3-git-send-email-mreitz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Max Reitz 2014-10-24 12:57:59 +02:00 committed by Stefan Hajnoczi
parent e6d7ec32dd
commit d7f62751a1
1 changed files with 14 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
block/raw-posix.c
View File

@ -1481,12 +1481,12 @@ out:
return result;
}
static int64_t try_fiemap(BlockDriverState *bs, off_t start, off_t *data,
off_t *hole, int nb_sectors, int *pnum)
static int try_fiemap(BlockDriverState *bs, off_t start, off_t *data,
off_t *hole, int nb_sectors)
{
#ifdef CONFIG_FIEMAP
BDRVRawState *s = bs->opaque;
int64_t ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
int ret = 0;
struct {
struct fiemap fm;
struct fiemap_extent fe;
@ -1527,8 +1527,8 @@ static int64_t try_fiemap(BlockDriverState *bs, off_t start, off_t *data,
#endif
}
static int64_t try_seek_hole(BlockDriverState *bs, off_t start, off_t *data,
off_t *hole, int *pnum)
static int try_seek_hole(BlockDriverState *bs, off_t start, off_t *data,
off_t *hole)
{
#if defined SEEK_HOLE && defined SEEK_DATA
BDRVRawState *s = bs->opaque;
@ -1548,7 +1548,7 @@ static int64_t try_seek_hole(BlockDriverState *bs, off_t start, off_t *data,
}
}
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
return 0;
#else
return -ENOTSUP;
#endif
@ -1575,7 +1575,7 @@ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
{
off_t start, data = 0, hole = 0;
int64_t total_size;
int64_t ret;
int ret;
ret = fd_open(bs);
if (ret < 0) {
@ -1593,28 +1593,28 @@ static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
nb_sectors = DIV_ROUND_UP(total_size - start, BDRV_SECTOR_SIZE);
}
ret = try_seek_hole(bs, start, &data, &hole, pnum);
ret = try_seek_hole(bs, start, &data, &hole);
if (ret < 0) {
ret = try_fiemap(bs, start, &data, &hole, nb_sectors, pnum);
ret = try_fiemap(bs, start, &data, &hole, nb_sectors);
if (ret < 0) {
/* Assume everything is allocated. */
data = 0;
hole = start + nb_sectors * BDRV_SECTOR_SIZE;
ret = BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
ret = 0;
}
}
assert(ret >= 0);
if (data <= start) {
/* On a data extent, compute sectors to the end of the extent. */
*pnum = MIN(nb_sectors, (hole - start) / BDRV_SECTOR_SIZE);
return ret | BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
} else {
/* On a hole, compute sectors to the beginning of the next extent. */
*pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
ret &= ~BDRV_BLOCK_DATA;
ret |= BDRV_BLOCK_ZERO;
return ret | BDRV_BLOCK_ZERO | BDRV_BLOCK_OFFSET_VALID | start;
}
return ret;
}
static coroutine_fn BlockAIOCB *raw_aio_discard(BlockDriverState *bs,