Return-Path: Received: from daytona.panasas.com ([67.152.220.89]:34756 "EHLO daytona.panasas.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752387Ab1EPQXQ (ORCPT ); Mon, 16 May 2011 12:23:16 -0400 From: Benny Halevy To: Trond Myklebust Cc: linux-nfs@vger.kernel.org, bharrosh@panasas.com Subject: [PATCH v3 19/29] pnfs-obj: read/write implementation Date: Mon, 16 May 2011 09:23:13 -0700 Message-Id: <1305562993-7992-1-git-send-email-bhalevy@panasas.com> In-Reply-To: <4DD14D8E.1070701@panasas.com> References: <4DD14D8E.1070701@panasas.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Content-Type: text/plain MIME-Version: 1.0 With the use of the in-kernel osd library. Implement read/write of data from/to osd-objects according to information specified in the objects-layout. TODO: Only a limited Mirror arrangement is implemented. stripping/raid will come in at later patches. [pnfs-obj: objio: cleanup un-indent _read_mirrors] Signed-off-by: Boaz Harrosh [added FIXME comment] [use REQ flags rather than BIO flags] [squashed with objlayout driver skeleton] Signed-off-by: Benny Halevy --- fs/nfs/objlayout/objio_osd.c | 470 ++++++++++++++++++++++++++++++++++++++++++ fs/nfs/objlayout/objlayout.c | 277 +++++++++++++++++++++++++ fs/nfs/objlayout/objlayout.h | 63 ++++++ 3 files changed, 810 insertions(+), 0 deletions(-) diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c index 9baae80..93b9580 100644 --- a/fs/nfs/objlayout/objio_osd.c +++ b/fs/nfs/objlayout/objio_osd.c @@ -44,6 +44,12 @@ #define NFSDBG_FACILITY NFSDBG_PNFS_LD +#define _LLU(x) ((unsigned long long)x) + +enum { BIO_MAX_PAGES_KMALLOC = + (PAGE_SIZE - sizeof(struct bio)) / sizeof(struct bio_vec), +}; + /* A per mountpoint struct currently for device cache */ struct objio_mount_type { struct list_head dev_list; @@ -213,6 +219,60 @@ out: return err; } +struct objio_state; +typedef ssize_t (*objio_done_fn)(struct objio_state *ios); + +struct objio_state { + /* Generic layer */ + struct objlayout_io_state ol_state; + + struct objio_segment *objio_seg; + + struct kref kref; + objio_done_fn done; + void *private; + + unsigned long length; + unsigned numdevs; /* Actually used devs in this IO */ + /* A per-device variable array of size numdevs */ + struct _objio_per_comp { + struct bio *bio; + struct osd_request *or; + } per_dev[]; +}; + +static int _verify_data_map(struct pnfs_osd_layout *layout) +{ + struct pnfs_osd_data_map *data_map = &layout->olo_map; + +/* FIXME: Only Mirror arangment for now. if not so, do not mount */ + if (data_map->odm_group_width || data_map->odm_group_depth) { + printk(KERN_ERR "Group width/depth not supported\n"); + return -ENOTSUPP; + } + if (data_map->odm_num_comps != layout->olo_num_comps) { + printk(KERN_ERR "odm_num_comps(%u) != olo_num_comps(%u)\n", + data_map->odm_num_comps, layout->olo_num_comps); + return -ENOTSUPP; + } + if (data_map->odm_raid_algorithm != PNFS_OSD_RAID_0) { + printk(KERN_ERR "Only RAID_0 for now\n"); + return -ENOTSUPP; + } + if (data_map->odm_num_comps != data_map->odm_mirror_cnt + 1) { + printk(KERN_ERR "Mirror only!, num_comps=%u mirrors=%u\n", + data_map->odm_num_comps, data_map->odm_mirror_cnt); + return -ENOTSUPP; + } + + if (data_map->odm_stripe_unit != PAGE_SIZE) { + printk(KERN_ERR "Stripe Unit != PAGE_SIZE not supported\n"); + return -ENOTSUPP; + } + + return 0; +} + int objio_alloc_lseg(void **outp, struct pnfs_layout_hdr *pnfslay, struct pnfs_layout_segment *lseg, @@ -221,6 +281,10 @@ int objio_alloc_lseg(void **outp, struct objio_segment *objio_seg; int err; + err = _verify_data_map(layout); + if (unlikely(err)) + return err; + objio_seg = kzalloc(sizeof(*objio_seg) + (layout->olo_num_comps - 1) * sizeof(objio_seg->ods[0]), GFP_KERNEL); @@ -249,6 +313,406 @@ void objio_free_lseg(void *p) kfree(objio_seg); } +int objio_alloc_io_state(void *seg, struct objlayout_io_state **outp) +{ + struct objio_segment *objio_seg = seg; + struct objio_state *ios; + const unsigned first_size = sizeof(*ios) + + objio_seg->num_comps * sizeof(ios->per_dev[0]); + + dprintk("%s: num_comps=%d\n", __func__, objio_seg->num_comps); + ios = kzalloc(first_size, GFP_KERNEL); + if (unlikely(!ios)) + return -ENOMEM; + + ios->objio_seg = objio_seg; + + *outp = &ios->ol_state; + return 0; +} + +void objio_free_io_state(struct objlayout_io_state *ol_state) +{ + struct objio_state *ios = container_of(ol_state, struct objio_state, + ol_state); + + kfree(ios); +} + +enum pnfs_osd_errno osd_pri_2_pnfs_err(enum osd_err_priority oep) +{ + switch (oep) { + case OSD_ERR_PRI_NO_ERROR: + return (enum pnfs_osd_errno)0; + + case OSD_ERR_PRI_CLEAR_PAGES: + BUG_ON(1); + return 0; + + case OSD_ERR_PRI_RESOURCE: + return PNFS_OSD_ERR_RESOURCE; + case OSD_ERR_PRI_BAD_CRED: + return PNFS_OSD_ERR_BAD_CRED; + case OSD_ERR_PRI_NO_ACCESS: + return PNFS_OSD_ERR_NO_ACCESS; + case OSD_ERR_PRI_UNREACHABLE: + return PNFS_OSD_ERR_UNREACHABLE; + case OSD_ERR_PRI_NOT_FOUND: + return PNFS_OSD_ERR_NOT_FOUND; + case OSD_ERR_PRI_NO_SPACE: + return PNFS_OSD_ERR_NO_SPACE; + default: + WARN_ON(1); + /* fallthrough */ + case OSD_ERR_PRI_EIO: + return PNFS_OSD_ERR_EIO; + } +} + +static void _clear_bio(struct bio *bio) +{ + struct bio_vec *bv; + unsigned i; + + __bio_for_each_segment(bv, bio, i, 0) { + unsigned this_count = bv->bv_len; + + if (likely(PAGE_SIZE == this_count)) + clear_highpage(bv->bv_page); + else + zero_user(bv->bv_page, bv->bv_offset, this_count); + } +} + +static int _io_check(struct objio_state *ios, bool is_write) +{ + enum osd_err_priority oep = OSD_ERR_PRI_NO_ERROR; + int lin_ret = 0; + int i; + + for (i = 0; i < ios->numdevs; i++) { + struct osd_sense_info osi; + struct osd_request *or = ios->per_dev[i].or; + int ret; + + if (!or) + continue; + + ret = osd_req_decode_sense(or, &osi); + if (likely(!ret)) + continue; + + if (OSD_ERR_PRI_CLEAR_PAGES == osi.osd_err_pri) { + /* start read offset passed endof file */ + BUG_ON(is_write); + _clear_bio(ios->per_dev[i].bio); + dprintk("%s: start read offset passed end of file " + "offset=0x%llx, length=0x%lx\n", __func__, + _LLU(ios->ol_state.offset), ios->length); + + continue; /* we recovered */ + } + + if (osi.osd_err_pri >= oep) { + oep = osi.osd_err_pri; + lin_ret = ret; + } + } + + return lin_ret; +} + +/* + * Common IO state helpers. + */ +static void _io_free(struct objio_state *ios) +{ + unsigned i; + + for (i = 0; i < ios->numdevs; i++) { + struct _objio_per_comp *per_dev = &ios->per_dev[i]; + + if (per_dev->or) { + osd_end_request(per_dev->or); + per_dev->or = NULL; + } + + if (per_dev->bio) { + bio_put(per_dev->bio); + per_dev->bio = NULL; + } + } +} + +static int _io_rw_pagelist(struct objio_state *ios) +{ + u64 length = ios->ol_state.count; + unsigned pgbase = ios->ol_state.pgbase; + unsigned nr_pages = ios->ol_state.nr_pages; + struct page **pages = ios->ol_state.pages; + struct bio *master_bio; + unsigned bio_size = min_t(unsigned, nr_pages, BIO_MAX_PAGES_KMALLOC); + + master_bio = bio_kmalloc(GFP_KERNEL, bio_size); + if (unlikely(!master_bio)) { + dprintk("%s: Faild to alloc bio pages=%d\n", + __func__, bio_size); + return -ENOMEM; + } + + ios->per_dev[0].bio = master_bio; + + while (length) { + unsigned cur_len, added_len; + + cur_len = min_t(u64, length, PAGE_SIZE - pgbase); + + added_len = bio_add_pc_page( + osd_request_queue(ios->objio_seg->ods[0]), + master_bio, *pages, cur_len, pgbase); + if (unlikely(cur_len != added_len)) + break; + + pgbase = 0; + ++pages; + length -= cur_len; + ios->length += cur_len; + } + + /* this should never happen */ + WARN_ON(!ios->length); + + return 0; +} + +static ssize_t _sync_done(struct objio_state *ios) +{ + struct completion *waiting = ios->private; + + complete(waiting); + return 0; +} + +static void _last_io(struct kref *kref) +{ + struct objio_state *ios = container_of(kref, struct objio_state, kref); + + ios->done(ios); +} + +static void _done_io(struct osd_request *or, void *p) +{ + struct objio_state *ios = p; + + kref_put(&ios->kref, _last_io); +} + +static ssize_t _io_exec(struct objio_state *ios) +{ + DECLARE_COMPLETION_ONSTACK(wait); + ssize_t status = 0; /* sync status */ + unsigned i; + objio_done_fn saved_done_fn = ios->done; + bool sync = ios->ol_state.sync; + + if (sync) { + ios->done = _sync_done; + ios->private = &wait; + } + + kref_init(&ios->kref); + + for (i = 0; i < ios->numdevs; i++) { + struct osd_request *or = ios->per_dev[i].or; + + if (!or) + continue; + + kref_get(&ios->kref); + osd_execute_request_async(or, _done_io, ios); + } + + kref_put(&ios->kref, _last_io); + + if (sync) { + wait_for_completion(&wait); + status = saved_done_fn(ios); + } + + return status; +} + +/* + * read + */ +static ssize_t _read_done(struct objio_state *ios) +{ + ssize_t status; + int ret = _io_check(ios, false); + + _io_free(ios); + + if (likely(!ret)) + status = ios->length; + else + status = ret; + + objlayout_read_done(&ios->ol_state, status, ios->ol_state.sync); + return status; +} + +static ssize_t _read_exec(struct objio_state *ios) +{ + struct osd_request *or = NULL; + struct _objio_per_comp *per_dev = &ios->per_dev[0]; + unsigned dev = 0; + struct pnfs_osd_object_cred *cred = + &ios->objio_seg->layout->olo_comps[dev]; + struct osd_obj_id obj = { + .partition = cred->oc_object_id.oid_partition_id, + .id = cred->oc_object_id.oid_object_id, + }; + int ret; + + or = osd_start_request(ios->objio_seg->ods[dev], GFP_KERNEL); + if (unlikely(!or)) { + ret = -ENOMEM; + goto err; + } + per_dev->or = or; + ios->numdevs++; + + osd_req_read(or, &obj, ios->ol_state.offset, per_dev->bio, ios->length); + + ret = osd_finalize_request(or, 0, cred->oc_cap.cred, NULL); + if (ret) { + dprintk("%s: Faild to osd_finalize_request() => %d\n", + __func__, ret); + goto err; + } + + dprintk("%s: obj=0x%llx start=0x%llx length=0x%lx\n", + __func__, obj.id, _LLU(ios->ol_state.offset), ios->length); + ios->done = _read_done; + return _io_exec(ios); /* In sync mode exec returns the io status */ + +err: + _io_free(ios); + return ret; +} + +ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state) +{ + struct objio_state *ios = container_of(ol_state, struct objio_state, + ol_state); + int ret; + + ret = _io_rw_pagelist(ios); + if (unlikely(ret)) + return ret; + + return _read_exec(ios); +} + +/* + * write + */ +static ssize_t _write_done(struct objio_state *ios) +{ + ssize_t status; + int ret = _io_check(ios, true); + + _io_free(ios); + + if (likely(!ret)) { + /* FIXME: should be based on the OSD's persistence model + * See OSD2r05 Section 4.13 Data persistence model */ + ios->ol_state.committed = NFS_FILE_SYNC; + status = ios->length; + } else { + status = ret; + } + + objlayout_write_done(&ios->ol_state, status, ios->ol_state.sync); + return status; +} + +static int _write_exec(struct objio_state *ios) +{ + int i, ret; + struct bio *master_bio = ios->per_dev[0].bio; + + for (i = 0; i < ios->objio_seg->num_comps; i++) { + struct osd_request *or = NULL; + struct pnfs_osd_object_cred *cred = + &ios->objio_seg->layout->olo_comps[i]; + struct osd_obj_id obj = {cred->oc_object_id.oid_partition_id, + cred->oc_object_id.oid_object_id}; + struct _objio_per_comp *per_dev = &ios->per_dev[i]; + struct bio *bio; + + or = osd_start_request(ios->objio_seg->ods[i], GFP_KERNEL); + if (unlikely(!or)) { + ret = -ENOMEM; + goto err; + } + per_dev->or = or; + ios->numdevs++; + + if (i != 0) { + bio = bio_kmalloc(GFP_KERNEL, master_bio->bi_max_vecs); + if (unlikely(!bio)) { + dprintk("Faild to allocate BIO size=%u\n", + master_bio->bi_max_vecs); + ret = -ENOMEM; + goto err; + } + + __bio_clone(bio, master_bio); + bio->bi_bdev = NULL; + bio->bi_next = NULL; + per_dev->bio = bio; + } else { + bio = master_bio; + bio->bi_rw |= REQ_WRITE; + } + + osd_req_write(or, &obj, ios->ol_state.offset, bio, ios->length); + + ret = osd_finalize_request(or, 0, cred->oc_cap.cred, NULL); + if (ret) { + dprintk("%s: Faild to osd_finalize_request() => %d\n", + __func__, ret); + goto err; + } + + dprintk("%s: [%d] obj=0x%llx start=0x%llx length=0x%lx\n", + __func__, i, obj.id, _LLU(ios->ol_state.offset), + ios->length); + } + + ios->done = _write_done; + return _io_exec(ios); /* In sync mode exec returns the io->status */ + +err: + _io_free(ios); + return ret; +} + +ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state, bool stable) +{ + struct objio_state *ios = container_of(ol_state, struct objio_state, + ol_state); + int ret; + + /* TODO: ios->stable = stable; */ + ret = _io_rw_pagelist(ios); + if (unlikely(ret)) + return ret; + + return _write_exec(ios); +} + static struct pnfs_layoutdriver_type objlayout_type = { .id = LAYOUT_OSD2_OBJECTS, .name = "LAYOUT_OSD2_OBJECTS", @@ -256,8 +720,14 @@ static struct pnfs_layoutdriver_type objlayout_type = { .set_layoutdriver = objlayout_set_layoutdriver, .unset_layoutdriver = objlayout_unset_layoutdriver, + .alloc_layout_hdr = objlayout_alloc_layout_hdr, + .free_layout_hdr = objlayout_free_layout_hdr, + .alloc_lseg = objlayout_alloc_lseg, .free_lseg = objlayout_free_lseg, + + .read_pagelist = objlayout_read_pagelist, + .write_pagelist = objlayout_write_pagelist, }; void *objio_init_mt(void) diff --git a/fs/nfs/objlayout/objlayout.c b/fs/nfs/objlayout/objlayout.c index 75c158a..04fcadd 100644 --- a/fs/nfs/objlayout/objlayout.c +++ b/fs/nfs/objlayout/objlayout.c @@ -44,6 +44,32 @@ struct pnfs_client_operations *pnfs_client_ops; /* + * Create a objlayout layout structure for the given inode and return it. + */ +struct pnfs_layout_hdr * +objlayout_alloc_layout_hdr(struct inode *inode) +{ + struct objlayout *objlay; + + objlay = kzalloc(sizeof(struct objlayout), GFP_KERNEL); + dprintk("%s: Return %p\n", __func__, objlay); + return &objlay->pnfs_layout; +} + +/* + * Free an objlayout layout structure + */ +void +objlayout_free_layout_hdr(struct pnfs_layout_hdr *lo) +{ + struct objlayout *objlay = OBJLAYOUT(lo); + + dprintk("%s: objlay %p\n", __func__, objlay); + + kfree(objlay); +} + +/* * Unmarshall layout and store it in pnfslay. */ struct pnfs_layout_segment * @@ -219,3 +245,254 @@ objlayout_unset_layoutdriver(struct nfs_server *server) objio_fini_mt(server->pnfs_ld_data); return 0; } + +/* + * I/O Operations + */ +static inline u64 +end_offset(u64 start, u64 len) +{ + u64 end; + + end = start + len; + return end >= start ? end : NFS4_MAX_UINT64; +} + +/* last octet in a range */ +static inline u64 +last_byte_offset(u64 start, u64 len) +{ + u64 end; + + BUG_ON(!len); + end = start + len; + return end > start ? end - 1 : NFS4_MAX_UINT64; +} + +static struct objlayout_io_state * +objlayout_alloc_io_state(struct pnfs_layout_hdr *pnfs_layout_type, + struct page **pages, + unsigned pgbase, + loff_t offset, + size_t count, + struct pnfs_layout_segment *lseg, + void *rpcdata) +{ + struct objlayout_segment *objlseg = + container_of(lseg, struct objlayout_segment, lseg); + struct objlayout_io_state *state; + u64 lseg_end_offset; + + dprintk("%s: allocating io_state\n", __func__); + if (objio_alloc_io_state(objlseg->internal, &state)) + return NULL; + + BUG_ON(offset < lseg->pls_range.offset); + lseg_end_offset = end_offset(lseg->pls_range.offset, lseg->pls_range.length); + BUG_ON(offset >= lseg_end_offset); + if (offset + count > lseg_end_offset) { + count = lseg->pls_range.length - (offset - lseg->pls_range.offset); + dprintk("%s: truncated count %Zd\n", __func__, count); + } + + if (pgbase > PAGE_SIZE) { + pages += pgbase >> PAGE_SHIFT; + pgbase &= ~PAGE_MASK; + } + + state->objlseg = objlseg; + state->rpcdata = rpcdata; + state->pages = pages; + state->pgbase = pgbase; + state->nr_pages = (pgbase + count + PAGE_SIZE - 1) >> PAGE_SHIFT; + state->offset = offset; + state->count = count; + state->sync = 0; + + return state; +} + +static void +objlayout_free_io_state(struct objlayout_io_state *state) +{ + dprintk("%s: freeing io_state\n", __func__); + if (unlikely(!state)) + return; + + objio_free_io_state(state); +} + +/* + * I/O done common code + */ +static void +objlayout_iodone(struct objlayout_io_state *state) +{ + dprintk("%s: state %p status\n", __func__, state); + + objlayout_free_io_state(state); +} + +/* Function scheduled on rpc workqueue to call ->nfs_readlist_complete(). + * This is because the osd completion is called with ints-off from + * the block layer + */ +static void _rpc_read_complete(struct work_struct *work) +{ + struct rpc_task *task; + struct nfs_read_data *rdata; + + dprintk("%s enter\n", __func__); + task = container_of(work, struct rpc_task, u.tk_work); + rdata = container_of(task, struct nfs_read_data, task); + + pnfs_ld_read_done(rdata); +} + +void +objlayout_read_done(struct objlayout_io_state *state, ssize_t status, bool sync) +{ + int eof = state->eof; + struct nfs_read_data *rdata; + + state->status = status; + dprintk("%s: Begin status=%ld eof=%d\n", __func__, status, eof); + rdata = state->rpcdata; + rdata->task.tk_status = status; + if (status >= 0) { + rdata->res.count = status; + rdata->res.eof = eof; + } + objlayout_iodone(state); + /* must not use state after this point */ + + if (sync) + pnfs_ld_read_done(rdata); + else { + INIT_WORK(&rdata->task.u.tk_work, _rpc_read_complete); + schedule_work(&rdata->task.u.tk_work); + } +} + +/* + * Perform sync or async reads. + */ +enum pnfs_try_status +objlayout_read_pagelist(struct nfs_read_data *rdata) +{ + loff_t offset = rdata->args.offset; + size_t count = rdata->args.count; + struct objlayout_io_state *state; + ssize_t status = 0; + loff_t eof; + + dprintk("%s: Begin inode %p offset %llu count %d\n", + __func__, rdata->inode, offset, (int)count); + + eof = i_size_read(rdata->inode); + if (unlikely(offset + count > eof)) { + if (offset >= eof) { + status = 0; + rdata->res.count = 0; + rdata->res.eof = 1; + goto out; + } + count = eof - offset; + } + + state = objlayout_alloc_io_state(NFS_I(rdata->inode)->layout, + rdata->args.pages, rdata->args.pgbase, + offset, count, + rdata->lseg, rdata); + if (unlikely(!state)) { + status = -ENOMEM; + goto out; + } + + state->eof = state->offset + state->count >= eof; + + status = objio_read_pagelist(state); + out: + dprintk("%s: Return status %Zd\n", __func__, status); + rdata->pnfs_error = status; + return PNFS_ATTEMPTED; +} + +/* Function scheduled on rpc workqueue to call ->nfs_writelist_complete(). + * This is because the osd completion is called with ints-off from + * the block layer + */ +static void _rpc_write_complete(struct work_struct *work) +{ + struct rpc_task *task; + struct nfs_write_data *wdata; + + dprintk("%s enter\n", __func__); + task = container_of(work, struct rpc_task, u.tk_work); + wdata = container_of(task, struct nfs_write_data, task); + + pnfs_ld_write_done(wdata); +} + +void +objlayout_write_done(struct objlayout_io_state *state, ssize_t status, + bool sync) +{ + struct nfs_write_data *wdata; + + dprintk("%s: Begin\n", __func__); + wdata = state->rpcdata; + state->status = status; + wdata->task.tk_status = status; + if (status >= 0) { + wdata->res.count = status; + wdata->verf.committed = state->committed; + dprintk("%s: Return status %d committed %d\n", + __func__, wdata->task.tk_status, + wdata->verf.committed); + } else + dprintk("%s: Return status %d\n", + __func__, wdata->task.tk_status); + objlayout_iodone(state); + /* must not use state after this point */ + + if (sync) + pnfs_ld_write_done(wdata); + else { + INIT_WORK(&wdata->task.u.tk_work, _rpc_write_complete); + schedule_work(&wdata->task.u.tk_work); + } +} + +/* + * Perform sync or async writes. + */ +enum pnfs_try_status +objlayout_write_pagelist(struct nfs_write_data *wdata, + int how) +{ + struct objlayout_io_state *state; + ssize_t status; + + dprintk("%s: Begin inode %p offset %llu count %u\n", + __func__, wdata->inode, wdata->args.offset, wdata->args.count); + + state = objlayout_alloc_io_state(NFS_I(wdata->inode)->layout, + wdata->args.pages, + wdata->args.pgbase, + wdata->args.offset, + wdata->args.count, + wdata->lseg, wdata); + if (unlikely(!state)) { + status = -ENOMEM; + goto out; + } + + state->sync = how & FLUSH_SYNC; + + status = objio_write_pagelist(state, how & FLUSH_STABLE); + out: + dprintk("%s: Return status %Zd\n", __func__, status); + wdata->pnfs_error = status; + return PNFS_ATTEMPTED; +} diff --git a/fs/nfs/objlayout/objlayout.h b/fs/nfs/objlayout/objlayout.h index 55caa64..54dbd55 100644 --- a/fs/nfs/objlayout/objlayout.h +++ b/fs/nfs/objlayout/objlayout.h @@ -55,6 +55,39 @@ struct objlayout_segment { }; /* + * per-inode layout + */ +struct objlayout { + struct pnfs_layout_hdr pnfs_layout; +}; + +static inline struct objlayout * +OBJLAYOUT(struct pnfs_layout_hdr *lo) +{ + return container_of(lo, struct objlayout, pnfs_layout); +} + +/* + * per-I/O operation state + * embedded in objects provider io_state data structure + */ +struct objlayout_io_state { + struct objlayout_segment *objlseg; + + struct page **pages; + unsigned pgbase; + unsigned nr_pages; + unsigned long count; + loff_t offset; + bool sync; + + void *rpcdata; + int status; /* res */ + int eof; /* res */ + int committed; /* res */ +}; + +/* * Raid engine I/O API */ extern void *objio_init_mt(void); @@ -66,12 +99,35 @@ extern int objio_alloc_lseg(void **outp, struct pnfs_osd_layout *layout); extern void objio_free_lseg(void *p); +extern int objio_alloc_io_state(void *seg, struct objlayout_io_state **outp); +extern void objio_free_io_state(struct objlayout_io_state *state); + +extern ssize_t objio_read_pagelist(struct objlayout_io_state *ol_state); +extern ssize_t objio_write_pagelist(struct objlayout_io_state *ol_state, + bool stable); + +/* + * callback API + */ +extern void objlayout_io_set_result(struct objlayout_io_state *state, + unsigned index, int osd_error, + u64 offset, u64 length, bool is_write); + +extern void objlayout_read_done(struct objlayout_io_state *state, + ssize_t status, bool sync); +extern void objlayout_write_done(struct objlayout_io_state *state, + ssize_t status, bool sync); + /* * exported generic objects function vectors */ + extern int objlayout_set_layoutdriver(struct nfs_server *); extern int objlayout_unset_layoutdriver(struct nfs_server *); +extern struct pnfs_layout_hdr *objlayout_alloc_layout_hdr(struct inode *); +extern void objlayout_free_layout_hdr(struct pnfs_layout_hdr *); + extern struct pnfs_layout_segment *objlayout_alloc_lseg( struct pnfs_layout_hdr *, struct nfs4_layoutget_res *); @@ -81,4 +137,11 @@ extern int objlayout_get_deviceinfo(struct pnfs_layout_hdr *pnfslay, struct nfs4_deviceid *d_id, struct pnfs_osd_deviceaddr **deviceaddr); extern void objlayout_put_deviceinfo(struct pnfs_osd_deviceaddr *deviceaddr); +extern enum pnfs_try_status objlayout_read_pagelist( + struct nfs_read_data *); + +extern enum pnfs_try_status objlayout_write_pagelist( + struct nfs_write_data *, + int how); + #endif /* _OBJLAYOUT_H */ -- 1.7.3.4