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block: change discard to co_discard 

Since coroutine operation is now mandatory, convert both bdrv_discard
implementations to coroutines.  For qcow2, this means taking the lock
around the operation.  raw-posix remains synchronous.

The bdrv_discard callback is then unused and can be eliminated.

Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
master
Paolo Bonzini 2011-10-20 13:16:25 +02:00 committed by Kevin Wolf
parent 8b94ff8573
commit 6db39ae2e2
4 changed files with 13 additions and 10 deletions
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2
block.c
View File

@ -2962,8 +2962,6 @@ int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num,
qemu_coroutine_yield();
return co.ret;
}
} else if (bs->drv->bdrv_discard) {
return bs->drv->bdrv_discard(bs, sector_num, nb_sectors);
} else {
return 0;
}

14
block/qcow2.c
View File

@ -978,11 +978,17 @@ static int qcow2_make_empty(BlockDriverState *bs)
return 0;
}
static int qcow2_discard(BlockDriverState *bs, int64_t sector_num,
int nb_sectors)
static coroutine_fn int qcow2_co_discard(BlockDriverState *bs,
int64_t sector_num, int nb_sectors)
{
return qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS,
int ret;
BDRVQcowState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = qcow2_discard_clusters(bs, sector_num << BDRV_SECTOR_BITS,
nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static int qcow2_truncate(BlockDriverState *bs, int64_t offset)
@ -1239,7 +1245,7 @@ static BlockDriver bdrv_qcow2 = {
.bdrv_co_writev = qcow2_co_writev,
.bdrv_co_flush = qcow2_co_flush,
.bdrv_discard = qcow2_discard,
.bdrv_co_discard = qcow2_co_discard,
.bdrv_truncate = qcow2_truncate,
.bdrv_write_compressed = qcow2_write_compressed,

5
block/raw-posix.c
View File

@ -602,7 +602,8 @@ static int xfs_discard(BDRVRawState *s, int64_t sector_num, int nb_sectors)
}
#endif
static int raw_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors)
static coroutine_fn int raw_co_discard(BlockDriverState *bs,
int64_t sector_num, int nb_sectors)
{
#ifdef CONFIG_XFS
BDRVRawState *s = bs->opaque;
@ -632,7 +633,7 @@ static BlockDriver bdrv_file = {
.bdrv_file_open = raw_open,
.bdrv_close = raw_close,
.bdrv_create = raw_create,
.bdrv_discard = raw_discard,
.bdrv_co_discard = raw_co_discard,
.bdrv_aio_readv = raw_aio_readv,
.bdrv_aio_writev = raw_aio_writev,

2
block_int.h
View File

@ -62,8 +62,6 @@ struct BlockDriver {
const uint8_t *buf, int nb_sectors);
void (*bdrv_close)(BlockDriverState *bs);
int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);
int (*bdrv_discard)(BlockDriverState *bs, int64_t sector_num,
int nb_sectors);
int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, int *pnum);
int (*bdrv_set_key)(BlockDriverState *bs, const char *key);