diff options
Diffstat (limited to 'block/raw_bsd.c')
| -rw-r--r-- | block/raw_bsd.c | 59 |
1 files changed, 34 insertions, 25 deletions
diff --git a/block/raw_bsd.c b/block/raw_bsd.c index 5f9dd29..588d408 100644 --- a/block/raw_bsd.c +++ b/block/raw_bsd.c @@ -50,33 +50,30 @@ static int raw_reopen_prepare(BDRVReopenState *reopen_state, return 0; } -static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num, - int nb_sectors, QEMUIOVector *qiov) +static int coroutine_fn raw_co_preadv(BlockDriverState *bs, uint64_t offset, + uint64_t bytes, QEMUIOVector *qiov, + int flags) { BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); - return bdrv_co_readv(bs->file, sector_num, nb_sectors, qiov); + return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags); } -static int coroutine_fn -raw_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors, - QEMUIOVector *qiov, int flags) +static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, uint64_t offset, + uint64_t bytes, QEMUIOVector *qiov, + int flags) { void *buf = NULL; BlockDriver *drv; QEMUIOVector local_qiov; int ret; - if (bs->probed && sector_num == 0) { - /* As long as these conditions are true, we can't get partial writes to - * the probe buffer and can just directly check the request. */ + if (bs->probed && offset < BLOCK_PROBE_BUF_SIZE && bytes) { + /* Handling partial writes would be a pain - so we just + * require that guests have 512-byte request alignment if + * probing occurred */ QEMU_BUILD_BUG_ON(BLOCK_PROBE_BUF_SIZE != 512); QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512); - - if (nb_sectors == 0) { - /* qemu_iovec_to_buf() would fail, but we want to return success - * instead of -EINVAL in this case. */ - return 0; - } + assert(offset == 0 && bytes >= BLOCK_PROBE_BUF_SIZE); buf = qemu_try_blockalign(bs->file->bs, 512); if (!buf) { @@ -105,8 +102,7 @@ raw_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors, } BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); - ret = bdrv_co_pwritev(bs->file, sector_num * BDRV_SECTOR_SIZE, - nb_sectors * BDRV_SECTOR_SIZE, qiov, flags); + ret = bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags); fail: if (qiov == &local_qiov) { @@ -134,10 +130,10 @@ static int coroutine_fn raw_co_pwrite_zeroes(BlockDriverState *bs, return bdrv_co_pwrite_zeroes(bs->file, offset, count, flags); } -static int coroutine_fn raw_co_discard(BlockDriverState *bs, - int64_t sector_num, int nb_sectors) +static int coroutine_fn raw_co_pdiscard(BlockDriverState *bs, + int64_t offset, int count) { - return bdrv_co_discard(bs->file->bs, sector_num, nb_sectors); + return bdrv_co_pdiscard(bs->file->bs, offset, count); } static int64_t raw_getlength(BlockDriverState *bs) @@ -150,6 +146,16 @@ static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) return bdrv_get_info(bs->file->bs, bdi); } +static void raw_refresh_limits(BlockDriverState *bs, Error **errp) +{ + if (bs->probed) { + /* To make it easier to protect the first sector, any probed + * image is restricted to read-modify-write on sub-sector + * operations. */ + bs->bl.request_alignment = BDRV_SECTOR_SIZE; + } +} + static int raw_truncate(BlockDriverState *bs, int64_t offset) { return bdrv_truncate(bs->file->bs, offset); @@ -192,8 +198,10 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags, Error **errp) { bs->sg = bs->file->bs->sg; - bs->supported_write_flags = BDRV_REQ_FUA; - bs->supported_zero_flags = BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP; + bs->supported_write_flags = BDRV_REQ_FUA & + bs->file->bs->supported_write_flags; + bs->supported_zero_flags = (BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) & + bs->file->bs->supported_zero_flags; if (bs->probed && !bdrv_is_read_only(bs)) { fprintf(stderr, @@ -238,15 +246,16 @@ BlockDriver bdrv_raw = { .bdrv_open = &raw_open, .bdrv_close = &raw_close, .bdrv_create = &raw_create, - .bdrv_co_readv = &raw_co_readv, - .bdrv_co_writev_flags = &raw_co_writev_flags, + .bdrv_co_preadv = &raw_co_preadv, + .bdrv_co_pwritev = &raw_co_pwritev, .bdrv_co_pwrite_zeroes = &raw_co_pwrite_zeroes, - .bdrv_co_discard = &raw_co_discard, + .bdrv_co_pdiscard = &raw_co_pdiscard, .bdrv_co_get_block_status = &raw_co_get_block_status, .bdrv_truncate = &raw_truncate, .bdrv_getlength = &raw_getlength, .has_variable_length = true, .bdrv_get_info = &raw_get_info, + .bdrv_refresh_limits = &raw_refresh_limits, .bdrv_probe_blocksizes = &raw_probe_blocksizes, .bdrv_probe_geometry = &raw_probe_geometry, .bdrv_media_changed = &raw_media_changed, |