diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2010-06-04 09:49:04 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2010-06-15 09:41:58 +0200 |
| commit | 6c6ea921ff9eebec514635aa7af893adf893fb12 (patch) | |
| tree | f3d6949feec63dcd42e78765ae334bb9e071efdc /block | |
| parent | fd42deeb4cb42f90084046e3ebdb4383953195e3 (diff) | |
vpc: Read/write multiple sectors at once
This changes the vpc block driver (for VHD) to read/write multiple sectors at
once instead of doing a request for each single sector.
Before this, running qemu-iotests for VPC took ages, now it's actually quite
reasonable to run it always (down from ~1 hour to 40 seconds for me).
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/vpc.c | 41 |
1 files changed, 30 insertions, 11 deletions
diff --git a/block/vpc.c b/block/vpc.c index 214e9d121..f1f73e2a8 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -371,23 +371,33 @@ fail: static int vpc_read(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors) { + BDRVVPCState *s = bs->opaque; int ret; int64_t offset; + int64_t sectors, sectors_per_block; while (nb_sectors > 0) { offset = get_sector_offset(bs, sector_num, 0); + sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; + sectors = sectors_per_block - (sector_num % sectors_per_block); + if (sectors > nb_sectors) { + sectors = nb_sectors; + } + if (offset == -1) { - memset(buf, 0, 512); + memset(buf, 0, sectors * BDRV_SECTOR_SIZE); } else { - ret = bdrv_pread(bs->file, offset, buf, 512); - if (ret != 512) + ret = bdrv_pread(bs->file, offset, buf, + sectors * BDRV_SECTOR_SIZE); + if (ret != sectors * BDRV_SECTOR_SIZE) { return -1; + } } - nb_sectors--; - sector_num++; - buf += 512; + nb_sectors -= sectors; + sector_num += sectors; + buf += sectors * BDRV_SECTOR_SIZE; } return 0; } @@ -395,25 +405,34 @@ static int vpc_read(BlockDriverState *bs, int64_t sector_num, static int vpc_write(BlockDriverState *bs, int64_t sector_num, const uint8_t *buf, int nb_sectors) { + BDRVVPCState *s = bs->opaque; int64_t offset; + int64_t sectors, sectors_per_block; int ret; while (nb_sectors > 0) { offset = get_sector_offset(bs, sector_num, 1); + sectors_per_block = s->block_size >> BDRV_SECTOR_BITS; + sectors = sectors_per_block - (sector_num % sectors_per_block); + if (sectors > nb_sectors) { + sectors = nb_sectors; + } + if (offset == -1) { offset = alloc_block(bs, sector_num); if (offset < 0) return -1; } - ret = bdrv_pwrite(bs->file, offset, buf, 512); - if (ret != 512) + ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE); + if (ret != sectors * BDRV_SECTOR_SIZE) { return -1; + } - nb_sectors--; - sector_num++; - buf += 512; + nb_sectors -= sectors; + sector_num += sectors; + buf += sectors * BDRV_SECTOR_SIZE; } return 0; |