diff options
Diffstat (limited to 'block/block-backend.c')
| -rw-r--r-- | block/block-backend.c | 114 |
1 files changed, 34 insertions, 80 deletions
diff --git a/block/block-backend.c b/block/block-backend.c index 16c9d5e0f2..a1e2c7fa20 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -1,7 +1,7 @@ /* * QEMU Block backends * - * Copyright (C) 2014 Red Hat, Inc. + * Copyright (C) 2014-2016 Red Hat, Inc. * * Authors: * Markus Armbruster <armbru@redhat.com>, @@ -692,7 +692,7 @@ static int coroutine_fn blk_co_preadv(BlockBackend *blk, int64_t offset, return ret; } - return bdrv_co_do_preadv(blk_bs(blk), offset, bytes, qiov, flags); + return bdrv_co_preadv(blk_bs(blk), offset, bytes, qiov, flags); } static int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, @@ -710,7 +710,7 @@ static int coroutine_fn blk_co_pwritev(BlockBackend *blk, int64_t offset, flags |= BDRV_REQ_FUA; } - return bdrv_co_do_pwritev(blk_bs(blk), offset, bytes, qiov, flags); + return bdrv_co_pwritev(blk_bs(blk), offset, bytes, qiov, flags); } typedef struct BlkRwCo { @@ -772,55 +772,28 @@ static int blk_prw(BlockBackend *blk, int64_t offset, uint8_t *buf, return rwco.ret; } -static int blk_rw(BlockBackend *blk, int64_t sector_num, uint8_t *buf, - int nb_sectors, CoroutineEntry co_entry, - BdrvRequestFlags flags) -{ - if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { - return -EINVAL; - } - - return blk_prw(blk, sector_num << BDRV_SECTOR_BITS, buf, - nb_sectors << BDRV_SECTOR_BITS, co_entry, flags); -} - -int blk_read(BlockBackend *blk, int64_t sector_num, uint8_t *buf, - int nb_sectors) -{ - return blk_rw(blk, sector_num, buf, nb_sectors, blk_read_entry, 0); -} - -int blk_read_unthrottled(BlockBackend *blk, int64_t sector_num, uint8_t *buf, - int nb_sectors) +int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf, + int count) { BlockDriverState *bs = blk_bs(blk); - bool enabled; int ret; - ret = blk_check_request(blk, sector_num, nb_sectors); + ret = blk_check_byte_request(blk, offset, count); if (ret < 0) { return ret; } - enabled = bs->io_limits_enabled; - bs->io_limits_enabled = false; - ret = blk_read(blk, sector_num, buf, nb_sectors); - bs->io_limits_enabled = enabled; + bdrv_no_throttling_begin(bs); + ret = blk_pread(blk, offset, buf, count); + bdrv_no_throttling_end(bs); return ret; } -int blk_write(BlockBackend *blk, int64_t sector_num, const uint8_t *buf, - int nb_sectors) -{ - return blk_rw(blk, sector_num, (uint8_t*) buf, nb_sectors, - blk_write_entry, 0); -} - -int blk_write_zeroes(BlockBackend *blk, int64_t sector_num, - int nb_sectors, BdrvRequestFlags flags) +int blk_write_zeroes(BlockBackend *blk, int64_t offset, + int count, BdrvRequestFlags flags) { - return blk_rw(blk, sector_num, NULL, nb_sectors, blk_write_entry, - flags | BDRV_REQ_ZERO_WRITE); + return blk_prw(blk, offset, NULL, count, blk_write_entry, + flags | BDRV_REQ_ZERO_WRITE); } static void error_callback_bh(void *opaque) @@ -932,18 +905,12 @@ static void blk_aio_write_entry(void *opaque) blk_aio_complete(acb); } -BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t sector_num, - int nb_sectors, BdrvRequestFlags flags, +BlockAIOCB *blk_aio_write_zeroes(BlockBackend *blk, int64_t offset, + int count, BdrvRequestFlags flags, BlockCompletionFunc *cb, void *opaque) { - if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { - return blk_abort_aio_request(blk, cb, opaque, -EINVAL); - } - - return blk_aio_prwv(blk, sector_num << BDRV_SECTOR_BITS, - nb_sectors << BDRV_SECTOR_BITS, NULL, - blk_aio_write_entry, flags | BDRV_REQ_ZERO_WRITE, - cb, opaque); + return blk_aio_prwv(blk, offset, count, NULL, blk_aio_write_entry, + flags | BDRV_REQ_ZERO_WRITE, cb, opaque); } int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) @@ -955,9 +922,11 @@ int blk_pread(BlockBackend *blk, int64_t offset, void *buf, int count) return count; } -int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count) +int blk_pwrite(BlockBackend *blk, int64_t offset, const void *buf, int count, + BdrvRequestFlags flags) { - int ret = blk_prw(blk, offset, (void*) buf, count, blk_write_entry, 0); + int ret = blk_prw(blk, offset, (void *) buf, count, blk_write_entry, + flags); if (ret < 0) { return ret; } @@ -991,30 +960,20 @@ int64_t blk_nb_sectors(BlockBackend *blk) return bdrv_nb_sectors(blk_bs(blk)); } -BlockAIOCB *blk_aio_readv(BlockBackend *blk, int64_t sector_num, - QEMUIOVector *iov, int nb_sectors, - BlockCompletionFunc *cb, void *opaque) +BlockAIOCB *blk_aio_preadv(BlockBackend *blk, int64_t offset, + QEMUIOVector *qiov, BdrvRequestFlags flags, + BlockCompletionFunc *cb, void *opaque) { - if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { - return blk_abort_aio_request(blk, cb, opaque, -EINVAL); - } - - assert(nb_sectors << BDRV_SECTOR_BITS == iov->size); - return blk_aio_prwv(blk, sector_num << BDRV_SECTOR_BITS, iov->size, iov, - blk_aio_read_entry, 0, cb, opaque); + return blk_aio_prwv(blk, offset, qiov->size, qiov, + blk_aio_read_entry, flags, cb, opaque); } -BlockAIOCB *blk_aio_writev(BlockBackend *blk, int64_t sector_num, - QEMUIOVector *iov, int nb_sectors, - BlockCompletionFunc *cb, void *opaque) +BlockAIOCB *blk_aio_pwritev(BlockBackend *blk, int64_t offset, + QEMUIOVector *qiov, BdrvRequestFlags flags, + BlockCompletionFunc *cb, void *opaque) { - if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { - return blk_abort_aio_request(blk, cb, opaque, -EINVAL); - } - - assert(nb_sectors << BDRV_SECTOR_BITS == iov->size); - return blk_aio_prwv(blk, sector_num << BDRV_SECTOR_BITS, iov->size, iov, - blk_aio_write_entry, 0, cb, opaque); + return blk_aio_prwv(blk, offset, qiov->size, qiov, + blk_aio_write_entry, flags, cb, opaque); } BlockAIOCB *blk_aio_flush(BlockBackend *blk, @@ -1444,15 +1403,10 @@ void *blk_aio_get(const AIOCBInfo *aiocb_info, BlockBackend *blk, return qemu_aio_get(aiocb_info, blk_bs(blk), cb, opaque); } -int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t sector_num, - int nb_sectors, BdrvRequestFlags flags) +int coroutine_fn blk_co_write_zeroes(BlockBackend *blk, int64_t offset, + int count, BdrvRequestFlags flags) { - if (nb_sectors < 0 || nb_sectors > BDRV_REQUEST_MAX_SECTORS) { - return -EINVAL; - } - - return blk_co_pwritev(blk, sector_num << BDRV_SECTOR_BITS, - nb_sectors << BDRV_SECTOR_BITS, NULL, + return blk_co_pwritev(blk, offset, count, NULL, flags | BDRV_REQ_ZERO_WRITE); } |