| Message ID | e5e1571c583874454760dc738ef3ea3470ea96e7.1556562150.git.berto@igalia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Remove bdrv_read() and bdrv_write() | expand |
Am 29.04.2019 um 20:42 hat Alberto Garcia geschrieben: > There's only a couple of bdrv_read() and bdrv_write() calls left in > the vdi code, and they can be trivially replaced with the byte-based > bdrv_pread() and bdrv_pwrite(). > > Signed-off-by: Alberto Garcia <berto@igalia.com> > --- > block/vdi.c | 11 ++++++----- > 1 file changed, 6 insertions(+), 5 deletions(-) > > diff --git a/block/vdi.c b/block/vdi.c > index e1c42ad732..8d849b2754 100644 > --- a/block/vdi.c > +++ b/block/vdi.c > @@ -384,7 +384,7 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags, > > logout("\n"); > > - ret = bdrv_read(bs->file, 0, (uint8_t *)&header, 1); > + ret = bdrv_pread(bs->file, 0, (uint8_t *)&header, sizeof(header)); Maybe worth adding this after the VdiHeader declaration? QEMU_BUILD_BUG_ON(sizeof(VdiHeader) != 512); > if (ret < 0) { > goto fail; > } > @@ -484,8 +484,8 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags, > goto fail; > } > > - ret = bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, > - bmap_size); > + ret = bdrv_pread(bs->file, header.offset_bmap, (uint8_t *)s->bmap, > + bmap_size * SECTOR_SIZE); > if (ret < 0) { > goto fail_free_bmap; > } > @@ -704,7 +704,7 @@ nonallocating_write: > assert(VDI_IS_ALLOCATED(bmap_first)); > *header = s->header; > vdi_header_to_le(header); > - ret = bdrv_write(bs->file, 0, block, 1); > + ret = bdrv_pwrite(bs->file, 0, block, sizeof(*block)); block is uint8_t*, so sizeof(*block) == 1. This is not what you want. (qemu-iotests catches this pretty early.) > g_free(block); > block = NULL; > > @@ -722,7 +722,8 @@ nonallocating_write: > base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE; > logout("will write %u block map sectors starting from entry %u\n", > n_sectors, bmap_first); > - ret = bdrv_write(bs->file, offset, base, n_sectors); > + ret = bdrv_pwrite(bs->file, offset * SECTOR_SIZE, base, > + n_sectors * SECTOR_SIZE); > } > > return ret; Let's avoid returning a non-zero positive number in the success case here. bdrv_driver_pwritev() checks ret == 0 for BDRV_REQ_FUA emulation, and its callers don't expect positive results either. Maybe we should actually assert() in bdrv_driver_preadv/pwritev() that the result is <= 0. Kevin
diff --git a/block/vdi.c b/block/vdi.c index e1c42ad732..8d849b2754 100644 --- a/block/vdi.c +++ b/block/vdi.c @@ -384,7 +384,7 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags, logout("\n"); - ret = bdrv_read(bs->file, 0, (uint8_t *)&header, 1); + ret = bdrv_pread(bs->file, 0, (uint8_t *)&header, sizeof(header)); if (ret < 0) { goto fail; } @@ -484,8 +484,8 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags, goto fail; } - ret = bdrv_read(bs->file, s->bmap_sector, (uint8_t *)s->bmap, - bmap_size); + ret = bdrv_pread(bs->file, header.offset_bmap, (uint8_t *)s->bmap, + bmap_size * SECTOR_SIZE); if (ret < 0) { goto fail_free_bmap; } @@ -704,7 +704,7 @@ nonallocating_write: assert(VDI_IS_ALLOCATED(bmap_first)); *header = s->header; vdi_header_to_le(header); - ret = bdrv_write(bs->file, 0, block, 1); + ret = bdrv_pwrite(bs->file, 0, block, sizeof(*block)); g_free(block); block = NULL; @@ -722,7 +722,8 @@ nonallocating_write: base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE; logout("will write %u block map sectors starting from entry %u\n", n_sectors, bmap_first); - ret = bdrv_write(bs->file, offset, base, n_sectors); + ret = bdrv_pwrite(bs->file, offset * SECTOR_SIZE, base, + n_sectors * SECTOR_SIZE); } return ret;
There's only a couple of bdrv_read() and bdrv_write() calls left in the vdi code, and they can be trivially replaced with the byte-based bdrv_pread() and bdrv_pwrite(). Signed-off-by: Alberto Garcia <berto@igalia.com> --- block/vdi.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)