diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/rbd.c | 252 |
1 files changed, 90 insertions, 162 deletions
diff --git a/block/rbd.c b/block/rbd.c index e2028d3db5..380ad28861 100644 --- a/block/rbd.c +++ b/block/rbd.c @@ -78,22 +78,6 @@ typedef enum { RBD_AIO_FLUSH } RBDAIOCmd; -typedef struct RBDAIOCB { - BlockAIOCB common; - int64_t ret; - QEMUIOVector *qiov; - RBDAIOCmd cmd; - int error; - struct BDRVRBDState *s; -} RBDAIOCB; - -typedef struct RADOSCB { - RBDAIOCB *acb; - struct BDRVRBDState *s; - int64_t size; - int64_t ret; -} RADOSCB; - typedef struct BDRVRBDState { rados_t cluster; rados_ioctx_t io_ctx; @@ -105,6 +89,13 @@ typedef struct BDRVRBDState { uint64_t object_size; } BDRVRBDState; +typedef struct RBDTask { + BlockDriverState *bs; + Coroutine *co; + bool complete; + int64_t ret; +} RBDTask; + static int qemu_rbd_connect(rados_t *cluster, rados_ioctx_t *io_ctx, BlockdevOptionsRbd *opts, bool cache, const char *keypairs, const char *secretid, @@ -337,13 +328,6 @@ static int qemu_rbd_set_keypairs(rados_t cluster, const char *keypairs_json, return ret; } -static void qemu_rbd_memset(RADOSCB *rcb, int64_t offs) -{ - RBDAIOCB *acb = rcb->acb; - iov_memset(acb->qiov->iov, acb->qiov->niov, offs, 0, - acb->qiov->size - offs); -} - #ifdef LIBRBD_SUPPORTS_ENCRYPTION static int qemu_rbd_convert_luks_options( RbdEncryptionOptionsLUKSBase *luks_opts, @@ -733,46 +717,6 @@ exit: return ret; } -/* - * This aio completion is being called from rbd_finish_bh() and runs in qemu - * BH context. - */ -static void qemu_rbd_complete_aio(RADOSCB *rcb) -{ - RBDAIOCB *acb = rcb->acb; - int64_t r; - - r = rcb->ret; - - if (acb->cmd != RBD_AIO_READ) { - if (r < 0) { - acb->ret = r; - acb->error = 1; - } else if (!acb->error) { - acb->ret = rcb->size; - } - } else { - if (r < 0) { - qemu_rbd_memset(rcb, 0); - acb->ret = r; - acb->error = 1; - } else if (r < rcb->size) { - qemu_rbd_memset(rcb, r); - if (!acb->error) { - acb->ret = rcb->size; - } - } else if (!acb->error) { - acb->ret = r; - } - } - - g_free(rcb); - - acb->common.cb(acb->common.opaque, (acb->ret > 0 ? 0 : acb->ret)); - - qemu_aio_unref(acb); -} - static char *qemu_rbd_mon_host(BlockdevOptionsRbd *opts, Error **errp) { const char **vals; @@ -1122,89 +1066,59 @@ static int qemu_rbd_resize(BlockDriverState *bs, uint64_t size) return 0; } -static const AIOCBInfo rbd_aiocb_info = { - .aiocb_size = sizeof(RBDAIOCB), -}; - -static void rbd_finish_bh(void *opaque) +static void qemu_rbd_finish_bh(void *opaque) { - RADOSCB *rcb = opaque; - qemu_rbd_complete_aio(rcb); + RBDTask *task = opaque; + task->complete = 1; + aio_co_wake(task->co); } /* - * This is the callback function for rbd_aio_read and _write + * This is the completion callback function for all rbd aio calls + * started from qemu_rbd_start_co(). * * Note: this function is being called from a non qemu thread so * we need to be careful about what we do here. Generally we only * schedule a BH, and do the rest of the io completion handling - * from rbd_finish_bh() which runs in a qemu context. + * from qemu_rbd_finish_bh() which runs in a qemu context. */ -static void rbd_finish_aiocb(rbd_completion_t c, RADOSCB *rcb) +static void qemu_rbd_completion_cb(rbd_completion_t c, RBDTask *task) { - RBDAIOCB *acb = rcb->acb; - - rcb->ret = rbd_aio_get_return_value(c); + task->ret = rbd_aio_get_return_value(c); rbd_aio_release(c); - - replay_bh_schedule_oneshot_event(bdrv_get_aio_context(acb->common.bs), - rbd_finish_bh, rcb); + aio_bh_schedule_oneshot(bdrv_get_aio_context(task->bs), + qemu_rbd_finish_bh, task); } -static BlockAIOCB *rbd_start_aio(BlockDriverState *bs, - int64_t off, - QEMUIOVector *qiov, - int64_t size, - BlockCompletionFunc *cb, - void *opaque, - RBDAIOCmd cmd) +static int coroutine_fn qemu_rbd_start_co(BlockDriverState *bs, + uint64_t offset, + uint64_t bytes, + QEMUIOVector *qiov, + int flags, + RBDAIOCmd cmd) { - RBDAIOCB *acb; - RADOSCB *rcb = NULL; + BDRVRBDState *s = bs->opaque; + RBDTask task = { .bs = bs, .co = qemu_coroutine_self() }; rbd_completion_t c; int r; - BDRVRBDState *s = bs->opaque; - - acb = qemu_aio_get(&rbd_aiocb_info, bs, cb, opaque); - acb->cmd = cmd; - acb->qiov = qiov; - assert(!qiov || qiov->size == size); - - rcb = g_new(RADOSCB, 1); + assert(!qiov || qiov->size == bytes); - acb->ret = 0; - acb->error = 0; - acb->s = s; - - rcb->acb = acb; - rcb->s = acb->s; - rcb->size = size; - r = rbd_aio_create_completion(rcb, (rbd_callback_t) rbd_finish_aiocb, &c); + r = rbd_aio_create_completion(&task, + (rbd_callback_t) qemu_rbd_completion_cb, &c); if (r < 0) { - goto failed; + return r; } switch (cmd) { - case RBD_AIO_WRITE: - /* - * RBD APIs don't allow us to write more than actual size, so in order - * to support growing images, we resize the image before write - * operations that exceed the current size. - */ - if (off + size > s->image_size) { - r = qemu_rbd_resize(bs, off + size); - if (r < 0) { - goto failed_completion; - } - } - r = rbd_aio_writev(s->image, qiov->iov, qiov->niov, off, c); - break; case RBD_AIO_READ: - r = rbd_aio_readv(s->image, qiov->iov, qiov->niov, off, c); + r = rbd_aio_readv(s->image, qiov->iov, qiov->niov, offset, c); + break; + case RBD_AIO_WRITE: + r = rbd_aio_writev(s->image, qiov->iov, qiov->niov, offset, c); break; case RBD_AIO_DISCARD: - r = rbd_aio_discard(s->image, off, size, c); + r = rbd_aio_discard(s->image, offset, bytes, c); break; case RBD_AIO_FLUSH: r = rbd_aio_flush(s->image, c); @@ -1214,44 +1128,69 @@ static BlockAIOCB *rbd_start_aio(BlockDriverState *bs, } if (r < 0) { - goto failed_completion; + error_report("rbd request failed early: cmd %d offset %" PRIu64 + " bytes %" PRIu64 " flags %d r %d (%s)", cmd, offset, + bytes, flags, r, strerror(-r)); + rbd_aio_release(c); + return r; } - return &acb->common; -failed_completion: - rbd_aio_release(c); -failed: - g_free(rcb); + while (!task.complete) { + qemu_coroutine_yield(); + } - qemu_aio_unref(acb); - return NULL; + if (task.ret < 0) { + error_report("rbd request failed: cmd %d offset %" PRIu64 " bytes %" + PRIu64 " flags %d task.ret %" PRIi64 " (%s)", cmd, offset, + bytes, flags, task.ret, strerror(-task.ret)); + return task.ret; + } + + /* zero pad short reads */ + if (cmd == RBD_AIO_READ && task.ret < qiov->size) { + qemu_iovec_memset(qiov, task.ret, 0, qiov->size - task.ret); + } + + return 0; +} + +static int +coroutine_fn qemu_rbd_co_preadv(BlockDriverState *bs, uint64_t offset, + uint64_t bytes, QEMUIOVector *qiov, + int flags) +{ + return qemu_rbd_start_co(bs, offset, bytes, qiov, flags, RBD_AIO_READ); } -static BlockAIOCB *qemu_rbd_aio_preadv(BlockDriverState *bs, - uint64_t offset, uint64_t bytes, - QEMUIOVector *qiov, int flags, - BlockCompletionFunc *cb, - void *opaque) +static int +coroutine_fn qemu_rbd_co_pwritev(BlockDriverState *bs, uint64_t offset, + uint64_t bytes, QEMUIOVector *qiov, + int flags) { - return rbd_start_aio(bs, offset, qiov, bytes, cb, opaque, - RBD_AIO_READ); + BDRVRBDState *s = bs->opaque; + /* + * RBD APIs don't allow us to write more than actual size, so in order + * to support growing images, we resize the image before write + * operations that exceed the current size. + */ + if (offset + bytes > s->image_size) { + int r = qemu_rbd_resize(bs, offset + bytes); + if (r < 0) { + return r; + } + } + return qemu_rbd_start_co(bs, offset, bytes, qiov, flags, RBD_AIO_WRITE); } -static BlockAIOCB *qemu_rbd_aio_pwritev(BlockDriverState *bs, - uint64_t offset, uint64_t bytes, - QEMUIOVector *qiov, int flags, - BlockCompletionFunc *cb, - void *opaque) +static int coroutine_fn qemu_rbd_co_flush(BlockDriverState *bs) { - return rbd_start_aio(bs, offset, qiov, bytes, cb, opaque, - RBD_AIO_WRITE); + return qemu_rbd_start_co(bs, 0, 0, NULL, 0, RBD_AIO_FLUSH); } -static BlockAIOCB *qemu_rbd_aio_flush(BlockDriverState *bs, - BlockCompletionFunc *cb, - void *opaque) +static int coroutine_fn qemu_rbd_co_pdiscard(BlockDriverState *bs, + int64_t offset, int count) { - return rbd_start_aio(bs, 0, NULL, 0, cb, opaque, RBD_AIO_FLUSH); + return qemu_rbd_start_co(bs, offset, count, NULL, 0, RBD_AIO_DISCARD); } static int qemu_rbd_getinfo(BlockDriverState *bs, BlockDriverInfo *bdi) @@ -1450,16 +1389,6 @@ static int qemu_rbd_snap_list(BlockDriverState *bs, return snap_count; } -static BlockAIOCB *qemu_rbd_aio_pdiscard(BlockDriverState *bs, - int64_t offset, - int bytes, - BlockCompletionFunc *cb, - void *opaque) -{ - return rbd_start_aio(bs, offset, NULL, bytes, cb, opaque, - RBD_AIO_DISCARD); -} - static void coroutine_fn qemu_rbd_co_invalidate_cache(BlockDriverState *bs, Error **errp) { @@ -1540,11 +1469,10 @@ static BlockDriver bdrv_rbd = { .bdrv_co_truncate = qemu_rbd_co_truncate, .protocol_name = "rbd", - .bdrv_aio_preadv = qemu_rbd_aio_preadv, - .bdrv_aio_pwritev = qemu_rbd_aio_pwritev, - - .bdrv_aio_flush = qemu_rbd_aio_flush, - .bdrv_aio_pdiscard = qemu_rbd_aio_pdiscard, + .bdrv_co_preadv = qemu_rbd_co_preadv, + .bdrv_co_pwritev = qemu_rbd_co_pwritev, + .bdrv_co_flush_to_disk = qemu_rbd_co_flush, + .bdrv_co_pdiscard = qemu_rbd_co_pdiscard, .bdrv_snapshot_create = qemu_rbd_snap_create, .bdrv_snapshot_delete = qemu_rbd_snap_remove, |