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 <bharrosh@xxxxxxxxxxx>
[added FIXME comment]
[use REQ flags rather than BIO flags]
[squashed with objlayout driver skeleton]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
---
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
--
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