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block: take lock around bdrv_read implementations 

This does the first part of the conversion to coroutines, by
wrapping bdrv_read implementations to take the mutex.

Drivers that implement bdrv_read rather than bdrv_co_readv can
then benefit from asynchronous operation (at least if the underlying
protocol supports it, which is not the case for raw-win32), even
though they still operate with a bounce buffer.

raw-win32 does not need the lock, because it cannot yield.
nbd also doesn't probably, but better be safe.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2011-10-20 13:16:22 +02:00 committed by Kevin Wolf
parent 848c66e8f5
commit 2914caa088
9 changed files with 108 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
block/bochs.c
View File

@ -209,6 +209,17 @@ static int bochs_read(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static coroutine_fn int bochs_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVBochsState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = bochs_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static void bochs_close(BlockDriverState *bs)
{
BDRVBochsState *s = bs->opaque;
@ -220,7 +231,7 @@ static BlockDriver bdrv_bochs = {
.instance_size = sizeof(BDRVBochsState),
.bdrv_probe = bochs_probe,
.bdrv_open = bochs_open,
.bdrv_read = bochs_read,
.bdrv_read = bochs_co_read,
.bdrv_close = bochs_close,
};

13
block/cloop.c
View File

@ -146,6 +146,17 @@ static int cloop_read(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static coroutine_fn int cloop_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVCloopState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = cloop_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static void cloop_close(BlockDriverState *bs)
{
BDRVCloopState *s = bs->opaque;
@ -161,7 +172,7 @@ static BlockDriver bdrv_cloop = {
.instance_size = sizeof(BDRVCloopState),
.bdrv_probe = cloop_probe,
.bdrv_open = cloop_open,
.bdrv_read = cloop_read,
.bdrv_read = cloop_co_read,
.bdrv_close = cloop_close,
};

13
block/cow.c
View File

@ -201,6 +201,17 @@ static int cow_read(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static coroutine_fn int cow_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVCowState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = cow_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static int cow_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
@ -308,7 +319,7 @@ static BlockDriver bdrv_cow = {
.instance_size = sizeof(BDRVCowState),
.bdrv_probe = cow_probe,
.bdrv_open = cow_open,
.bdrv_read = cow_read,
.bdrv_read = cow_co_read,
.bdrv_write = cow_write,
.bdrv_close = cow_close,
.bdrv_create = cow_create,

13
block/dmg.c
View File

@ -282,6 +282,17 @@ static int dmg_read(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static coroutine_fn int dmg_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVDMGState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = dmg_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static void dmg_close(BlockDriverState *bs)
{
BDRVDMGState *s = bs->opaque;
@ -302,7 +313,7 @@ static BlockDriver bdrv_dmg = {
.instance_size = sizeof(BDRVDMGState),
.bdrv_probe = dmg_probe,
.bdrv_open = dmg_open,
.bdrv_read = dmg_read,
.bdrv_read = dmg_co_read,
.bdrv_close = dmg_close,
};

13
block/nbd.c
View File

@ -240,6 +240,17 @@ static int nbd_write(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static coroutine_fn int nbd_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVNBDState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = nbd_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static void nbd_close(BlockDriverState *bs)
{
BDRVNBDState *s = bs->opaque;
@ -260,7 +271,7 @@ static BlockDriver bdrv_nbd = {
.format_name = "nbd",
.instance_size = sizeof(BDRVNBDState),
.bdrv_file_open = nbd_open,
.bdrv_read = nbd_read,
.bdrv_read = nbd_co_read,
.bdrv_write = nbd_write,
.bdrv_close = nbd_close,
.bdrv_getlength = nbd_getlength,

13
block/parallels.c
View File

@ -136,6 +136,17 @@ static int parallels_read(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static coroutine_fn int parallels_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVParallelsState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = parallels_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static void parallels_close(BlockDriverState *bs)
{
BDRVParallelsState *s = bs->opaque;
@ -147,7 +158,7 @@ static BlockDriver bdrv_parallels = {
.instance_size = sizeof(BDRVParallelsState),
.bdrv_probe = parallels_probe,
.bdrv_open = parallels_open,
.bdrv_read = parallels_read,
.bdrv_read = parallels_co_read,
.bdrv_close = parallels_close,
};

13
block/vmdk.c
View File

@ -1024,6 +1024,17 @@ static int vmdk_read(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static coroutine_fn int vmdk_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVVmdkState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = vmdk_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static int vmdk_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
@ -1542,7 +1553,7 @@ static BlockDriver bdrv_vmdk = {
.instance_size = sizeof(BDRVVmdkState),
.bdrv_probe = vmdk_probe,
.bdrv_open = vmdk_open,
.bdrv_read = vmdk_read,
.bdrv_read = vmdk_co_read,
.bdrv_write = vmdk_write,
.bdrv_close = vmdk_close,
.bdrv_create = vmdk_create,

13
block/vpc.c
View File

@ -409,6 +409,17 @@ static int vpc_read(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static coroutine_fn int vpc_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVVPCState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = vpc_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
static int vpc_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
@ -641,7 +652,7 @@ static BlockDriver bdrv_vpc = {
.instance_size = sizeof(BDRVVPCState),
.bdrv_probe = vpc_probe,
.bdrv_open = vpc_open,
.bdrv_read = vpc_read,
.bdrv_read = vpc_co_read,
.bdrv_write = vpc_write,
.bdrv_flush = vpc_flush,
.bdrv_close = vpc_close,

13
block/vvfat.c
View File

@ -1281,6 +1281,17 @@ DLOG(fprintf(stderr, "sector %d not allocated\n", (int)sector_num));
return 0;
}
static coroutine_fn int vvfat_co_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
int ret;
BDRVVVFATState *s = bs->opaque;
qemu_co_mutex_lock(&s->lock);
ret = vvfat_read(bs, sector_num, buf, nb_sectors);
qemu_co_mutex_unlock(&s->lock);
return ret;
}
/* LATER TODO: statify all functions */
/*
@ -2805,7 +2816,7 @@ static BlockDriver bdrv_vvfat = {
.format_name = "vvfat",
.instance_size = sizeof(BDRVVVFATState),
.bdrv_file_open = vvfat_open,
.bdrv_read = vvfat_read,
.bdrv_read = vvfat_co_read,
.bdrv_write = vvfat_write,
.bdrv_close = vvfat_close,
.bdrv_is_allocated = vvfat_is_allocated,