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Diffstat (limited to 'fs/nfs/objlayout/objio_osd.c')
-rw-r--r--fs/nfs/objlayout/objio_osd.c1057
1 files changed, 1057 insertions, 0 deletions
diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c
new file mode 100644
index 000000000000..9cf208df1f25
--- /dev/null
+++ b/fs/nfs/objlayout/objio_osd.c
@@ -0,0 +1,1057 @@
+/*
+ * pNFS Objects layout implementation over open-osd initiator library
+ *
+ * Copyright (C) 2009 Panasas Inc. [year of first publication]
+ * All rights reserved.
+ *
+ * Benny Halevy <bhalevy@panasas.com>
+ * Boaz Harrosh <bharrosh@panasas.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * See the file COPYING included with this distribution for more details.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Panasas company nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/module.h>
+#include <scsi/osd_initiator.h>
+
+#include "objlayout.h"
+
+#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),
+};
+
+struct objio_dev_ent {
+ struct nfs4_deviceid_node id_node;
+ struct osd_dev *od;
+};
+
+static void
+objio_free_deviceid_node(struct nfs4_deviceid_node *d)
+{
+ struct objio_dev_ent *de = container_of(d, struct objio_dev_ent, id_node);
+
+ dprintk("%s: free od=%p\n", __func__, de->od);
+ osduld_put_device(de->od);
+ kfree(de);
+}
+
+static struct objio_dev_ent *_dev_list_find(const struct nfs_server *nfss,
+ const struct nfs4_deviceid *d_id)
+{
+ struct nfs4_deviceid_node *d;
+ struct objio_dev_ent *de;
+
+ d = nfs4_find_get_deviceid(nfss->pnfs_curr_ld, nfss->nfs_client, d_id);
+ if (!d)
+ return NULL;
+
+ de = container_of(d, struct objio_dev_ent, id_node);
+ return de;
+}
+
+static struct objio_dev_ent *
+_dev_list_add(const struct nfs_server *nfss,
+ const struct nfs4_deviceid *d_id, struct osd_dev *od,
+ gfp_t gfp_flags)
+{
+ struct nfs4_deviceid_node *d;
+ struct objio_dev_ent *de = kzalloc(sizeof(*de), gfp_flags);
+ struct objio_dev_ent *n;
+
+ if (!de) {
+ dprintk("%s: -ENOMEM od=%p\n", __func__, od);
+ return NULL;
+ }
+
+ dprintk("%s: Adding od=%p\n", __func__, od);
+ nfs4_init_deviceid_node(&de->id_node,
+ nfss->pnfs_curr_ld,
+ nfss->nfs_client,
+ d_id);
+ de->od = od;
+
+ d = nfs4_insert_deviceid_node(&de->id_node);
+ n = container_of(d, struct objio_dev_ent, id_node);
+ if (n != de) {
+ dprintk("%s: Race with other n->od=%p\n", __func__, n->od);
+ objio_free_deviceid_node(&de->id_node);
+ de = n;
+ }
+
+ atomic_inc(&de->id_node.ref);
+ return de;
+}
+
+struct caps_buffers {
+ u8 caps_key[OSD_CRYPTO_KEYID_SIZE];
+ u8 creds[OSD_CAP_LEN];
+};
+
+struct objio_segment {
+ struct pnfs_layout_segment lseg;
+
+ struct pnfs_osd_object_cred *comps;
+
+ unsigned mirrors_p1;
+ unsigned stripe_unit;
+ unsigned group_width; /* Data stripe_units without integrity comps */
+ u64 group_depth;
+ unsigned group_count;
+
+ unsigned max_io_size;
+
+ unsigned comps_index;
+ unsigned num_comps;
+ /* variable length */
+ struct objio_dev_ent *ods[];
+};
+
+static inline struct objio_segment *
+OBJIO_LSEG(struct pnfs_layout_segment *lseg)
+{
+ return container_of(lseg, struct objio_segment, lseg);
+}
+
+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 *layout;
+
+ 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;
+ unsigned long length;
+ u64 offset;
+ unsigned dev;
+ } per_dev[];
+};
+
+/* Send and wait for a get_device_info of devices in the layout,
+ then look them up with the osd_initiator library */
+static struct objio_dev_ent *_device_lookup(struct pnfs_layout_hdr *pnfslay,
+ struct objio_segment *objio_seg, unsigned comp,
+ gfp_t gfp_flags)
+{
+ struct pnfs_osd_deviceaddr *deviceaddr;
+ struct nfs4_deviceid *d_id;
+ struct objio_dev_ent *ode;
+ struct osd_dev *od;
+ struct osd_dev_info odi;
+ int err;
+
+ d_id = &objio_seg->comps[comp].oc_object_id.oid_device_id;
+
+ ode = _dev_list_find(NFS_SERVER(pnfslay->plh_inode), d_id);
+ if (ode)
+ return ode;
+
+ err = objlayout_get_deviceinfo(pnfslay, d_id, &deviceaddr, gfp_flags);
+ if (unlikely(err)) {
+ dprintk("%s: objlayout_get_deviceinfo dev(%llx:%llx) =>%d\n",
+ __func__, _DEVID_LO(d_id), _DEVID_HI(d_id), err);
+ return ERR_PTR(err);
+ }
+
+ odi.systemid_len = deviceaddr->oda_systemid.len;
+ if (odi.systemid_len > sizeof(odi.systemid)) {
+ err = -EINVAL;
+ goto out;
+ } else if (odi.systemid_len)
+ memcpy(odi.systemid, deviceaddr->oda_systemid.data,
+ odi.systemid_len);
+ odi.osdname_len = deviceaddr->oda_osdname.len;
+ odi.osdname = (u8 *)deviceaddr->oda_osdname.data;
+
+ if (!odi.osdname_len && !odi.systemid_len) {
+ dprintk("%s: !odi.osdname_len && !odi.systemid_len\n",
+ __func__);
+ err = -ENODEV;
+ goto out;
+ }
+
+ od = osduld_info_lookup(&odi);
+ if (unlikely(IS_ERR(od))) {
+ err = PTR_ERR(od);
+ dprintk("%s: osduld_info_lookup => %d\n", __func__, err);
+ goto out;
+ }
+
+ ode = _dev_list_add(NFS_SERVER(pnfslay->plh_inode), d_id, od,
+ gfp_flags);
+
+out:
+ dprintk("%s: return=%d\n", __func__, err);
+ objlayout_put_deviceinfo(deviceaddr);
+ return err ? ERR_PTR(err) : ode;
+}
+
+static int objio_devices_lookup(struct pnfs_layout_hdr *pnfslay,
+ struct objio_segment *objio_seg,
+ gfp_t gfp_flags)
+{
+ unsigned i;
+ int err;
+
+ /* lookup all devices */
+ for (i = 0; i < objio_seg->num_comps; i++) {
+ struct objio_dev_ent *ode;
+
+ ode = _device_lookup(pnfslay, objio_seg, i, gfp_flags);
+ if (unlikely(IS_ERR(ode))) {
+ err = PTR_ERR(ode);
+ goto out;
+ }
+ objio_seg->ods[i] = ode;
+ }
+ err = 0;
+
+out:
+ dprintk("%s: return=%d\n", __func__, err);
+ return err;
+}
+
+static int _verify_data_map(struct pnfs_osd_layout *layout)
+{
+ struct pnfs_osd_data_map *data_map = &layout->olo_map;
+ u64 stripe_length;
+ u32 group_width;
+
+/* FIXME: Only raid0 for now. if not go through MDS */
+ if (data_map->odm_raid_algorithm != PNFS_OSD_RAID_0) {
+ printk(KERN_ERR "Only RAID_0 for now\n");
+ return -ENOTSUPP;
+ }
+ if (0 != (data_map->odm_num_comps % (data_map->odm_mirror_cnt + 1))) {
+ printk(KERN_ERR "Data Map wrong, num_comps=%u mirrors=%u\n",
+ data_map->odm_num_comps, data_map->odm_mirror_cnt);
+ return -EINVAL;
+ }
+
+ if (data_map->odm_group_width)
+ group_width = data_map->odm_group_width;
+ else
+ group_width = data_map->odm_num_comps /
+ (data_map->odm_mirror_cnt + 1);
+
+ stripe_length = (u64)data_map->odm_stripe_unit * group_width;
+ if (stripe_length >= (1ULL << 32)) {
+ printk(KERN_ERR "Total Stripe length(0x%llx)"
+ " >= 32bit is not supported\n", _LLU(stripe_length));
+ return -ENOTSUPP;
+ }
+
+ if (0 != (data_map->odm_stripe_unit & ~PAGE_MASK)) {
+ printk(KERN_ERR "Stripe Unit(0x%llx)"
+ " must be Multples of PAGE_SIZE(0x%lx)\n",
+ _LLU(data_map->odm_stripe_unit), PAGE_SIZE);
+ return -ENOTSUPP;
+ }
+
+ return 0;
+}
+
+static void copy_single_comp(struct pnfs_osd_object_cred *cur_comp,
+ struct pnfs_osd_object_cred *src_comp,
+ struct caps_buffers *caps_p)
+{
+ WARN_ON(src_comp->oc_cap_key.cred_len > sizeof(caps_p->caps_key));
+ WARN_ON(src_comp->oc_cap.cred_len > sizeof(caps_p->creds));
+
+ *cur_comp = *src_comp;
+
+ memcpy(caps_p->caps_key, src_comp->oc_cap_key.cred,
+ sizeof(caps_p->caps_key));
+ cur_comp->oc_cap_key.cred = caps_p->caps_key;
+
+ memcpy(caps_p->creds, src_comp->oc_cap.cred,
+ sizeof(caps_p->creds));
+ cur_comp->oc_cap.cred = caps_p->creds;
+}
+
+int objio_alloc_lseg(struct pnfs_layout_segment **outp,
+ struct pnfs_layout_hdr *pnfslay,
+ struct pnfs_layout_range *range,
+ struct xdr_stream *xdr,
+ gfp_t gfp_flags)
+{
+ struct objio_segment *objio_seg;
+ struct pnfs_osd_xdr_decode_layout_iter iter;
+ struct pnfs_osd_layout layout;
+ struct pnfs_osd_object_cred *cur_comp, src_comp;
+ struct caps_buffers *caps_p;
+ int err;
+
+ err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
+ if (unlikely(err))
+ return err;
+
+ err = _verify_data_map(&layout);
+ if (unlikely(err))
+ return err;
+
+ objio_seg = kzalloc(sizeof(*objio_seg) +
+ sizeof(objio_seg->ods[0]) * layout.olo_num_comps +
+ sizeof(*objio_seg->comps) * layout.olo_num_comps +
+ sizeof(struct caps_buffers) * layout.olo_num_comps,
+ gfp_flags);
+ if (!objio_seg)
+ return -ENOMEM;
+
+ objio_seg->comps = (void *)(objio_seg->ods + layout.olo_num_comps);
+ cur_comp = objio_seg->comps;
+ caps_p = (void *)(cur_comp + layout.olo_num_comps);
+ while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err))
+ copy_single_comp(cur_comp++, &src_comp, caps_p++);
+ if (unlikely(err))
+ goto err;
+
+ objio_seg->num_comps = layout.olo_num_comps;
+ objio_seg->comps_index = layout.olo_comps_index;
+ err = objio_devices_lookup(pnfslay, objio_seg, gfp_flags);
+ if (err)
+ goto err;
+
+ objio_seg->mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1;
+ objio_seg->stripe_unit = layout.olo_map.odm_stripe_unit;
+ if (layout.olo_map.odm_group_width) {
+ objio_seg->group_width = layout.olo_map.odm_group_width;
+ objio_seg->group_depth = layout.olo_map.odm_group_depth;
+ objio_seg->group_count = layout.olo_map.odm_num_comps /
+ objio_seg->mirrors_p1 /
+ objio_seg->group_width;
+ } else {
+ objio_seg->group_width = layout.olo_map.odm_num_comps /
+ objio_seg->mirrors_p1;
+ objio_seg->group_depth = -1;
+ objio_seg->group_count = 1;
+ }
+
+ /* Cache this calculation it will hit for every page */
+ objio_seg->max_io_size = (BIO_MAX_PAGES_KMALLOC * PAGE_SIZE -
+ objio_seg->stripe_unit) *
+ objio_seg->group_width;
+
+ *outp = &objio_seg->lseg;
+ return 0;
+
+err:
+ kfree(objio_seg);
+ dprintk("%s: Error: return %d\n", __func__, err);
+ *outp = NULL;
+ return err;
+}
+
+void objio_free_lseg(struct pnfs_layout_segment *lseg)
+{
+ int i;
+ struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
+
+ for (i = 0; i < objio_seg->num_comps; i++) {
+ if (!objio_seg->ods[i])
+ break;
+ nfs4_put_deviceid_node(&objio_seg->ods[i]->id_node);
+ }
+ kfree(objio_seg);
+}
+
+int objio_alloc_io_state(struct pnfs_layout_segment *lseg,
+ struct objlayout_io_state **outp,
+ gfp_t gfp_flags)
+{
+ struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
+ struct objio_state *ios;
+ const unsigned first_size = sizeof(*ios) +
+ objio_seg->num_comps * sizeof(ios->per_dev[0]);
+ const unsigned sec_size = objio_seg->num_comps *
+ sizeof(ios->ol_state.ioerrs[0]);
+
+ ios = kzalloc(first_size + sec_size, gfp_flags);
+ if (unlikely(!ios))
+ return -ENOMEM;
+
+ ios->layout = objio_seg;
+ ios->ol_state.ioerrs = ((void *)ios) + first_size;
+ ios->ol_state.num_comps = objio_seg->num_comps;
+
+ *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;
+ unsigned dev;
+ 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->per_dev[i].offset),
+ ios->per_dev[i].length);
+
+ continue; /* we recovered */
+ }
+ dev = ios->per_dev[i].dev;
+ objlayout_io_set_result(&ios->ol_state, dev,
+ &ios->layout->comps[dev].oc_object_id,
+ osd_pri_2_pnfs_err(osi.osd_err_pri),
+ ios->per_dev[i].offset,
+ ios->per_dev[i].length,
+ is_write);
+
+ 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;
+ }
+ }
+}
+
+struct osd_dev *_io_od(struct objio_state *ios, unsigned dev)
+{
+ unsigned min_dev = ios->layout->comps_index;
+ unsigned max_dev = min_dev + ios->layout->num_comps;
+
+ BUG_ON(dev < min_dev || max_dev <= dev);
+ return ios->layout->ods[dev - min_dev]->od;
+}
+
+struct _striping_info {
+ u64 obj_offset;
+ u64 group_length;
+ unsigned dev;
+ unsigned unit_off;
+};
+
+static void _calc_stripe_info(struct objio_state *ios, u64 file_offset,
+ struct _striping_info *si)
+{
+ u32 stripe_unit = ios->layout->stripe_unit;
+ u32 group_width = ios->layout->group_width;
+ u64 group_depth = ios->layout->group_depth;
+ u32 U = stripe_unit * group_width;
+
+ u64 T = U * group_depth;
+ u64 S = T * ios->layout->group_count;
+ u64 M = div64_u64(file_offset, S);
+
+ /*
+ G = (L - (M * S)) / T
+ H = (L - (M * S)) % T
+ */
+ u64 LmodU = file_offset - M * S;
+ u32 G = div64_u64(LmodU, T);
+ u64 H = LmodU - G * T;
+
+ u32 N = div_u64(H, U);
+
+ div_u64_rem(file_offset, stripe_unit, &si->unit_off);
+ si->obj_offset = si->unit_off + (N * stripe_unit) +
+ (M * group_depth * stripe_unit);
+
+ /* "H - (N * U)" is just "H % U" so it's bound to u32 */
+ si->dev = (u32)(H - (N * U)) / stripe_unit + G * group_width;
+ si->dev *= ios->layout->mirrors_p1;
+
+ si->group_length = T - H;
+}
+
+static int _add_stripe_unit(struct objio_state *ios, unsigned *cur_pg,
+ unsigned pgbase, struct _objio_per_comp *per_dev, int cur_len,
+ gfp_t gfp_flags)
+{
+ unsigned pg = *cur_pg;
+ struct request_queue *q =
+ osd_request_queue(_io_od(ios, per_dev->dev));
+
+ per_dev->length += cur_len;
+
+ if (per_dev->bio == NULL) {
+ unsigned stripes = ios->layout->num_comps /
+ ios->layout->mirrors_p1;
+ unsigned pages_in_stripe = stripes *
+ (ios->layout->stripe_unit / PAGE_SIZE);
+ unsigned bio_size = (ios->ol_state.nr_pages + pages_in_stripe) /
+ stripes;
+
+ if (BIO_MAX_PAGES_KMALLOC < bio_size)
+ bio_size = BIO_MAX_PAGES_KMALLOC;
+
+ per_dev->bio = bio_kmalloc(gfp_flags, bio_size);
+ if (unlikely(!per_dev->bio)) {
+ dprintk("Faild to allocate BIO size=%u\n", bio_size);
+ return -ENOMEM;
+ }
+ }
+
+ while (cur_len > 0) {
+ unsigned pglen = min_t(unsigned, PAGE_SIZE - pgbase, cur_len);
+ unsigned added_len;
+
+ BUG_ON(ios->ol_state.nr_pages <= pg);
+ cur_len -= pglen;
+
+ added_len = bio_add_pc_page(q, per_dev->bio,
+ ios->ol_state.pages[pg], pglen, pgbase);
+ if (unlikely(pglen != added_len))
+ return -ENOMEM;
+ pgbase = 0;
+ ++pg;
+ }
+ BUG_ON(cur_len);
+
+ *cur_pg = pg;
+ return 0;
+}
+
+static int _prepare_one_group(struct objio_state *ios, u64 length,
+ struct _striping_info *si, unsigned *last_pg,
+ gfp_t gfp_flags)
+{
+ unsigned stripe_unit = ios->layout->stripe_unit;
+ unsigned mirrors_p1 = ios->layout->mirrors_p1;
+ unsigned devs_in_group = ios->layout->group_width * mirrors_p1;
+ unsigned dev = si->dev;
+ unsigned first_dev = dev - (dev % devs_in_group);
+ unsigned max_comp = ios->numdevs ? ios->numdevs - mirrors_p1 : 0;
+ unsigned cur_pg = *last_pg;
+ int ret = 0;
+
+ while (length) {
+ struct _objio_per_comp *per_dev = &ios->per_dev[dev];
+ unsigned cur_len, page_off = 0;
+
+ if (!per_dev->length) {
+ per_dev->dev = dev;
+ if (dev < si->dev) {
+ per_dev->offset = si->obj_offset + stripe_unit -
+ si->unit_off;
+ cur_len = stripe_unit;
+ } else if (dev == si->dev) {
+ per_dev->offset = si->obj_offset;
+ cur_len = stripe_unit - si->unit_off;
+ page_off = si->unit_off & ~PAGE_MASK;
+ BUG_ON(page_off &&
+ (page_off != ios->ol_state.pgbase));
+ } else { /* dev > si->dev */
+ per_dev->offset = si->obj_offset - si->unit_off;
+ cur_len = stripe_unit;
+ }
+
+ if (max_comp < dev)
+ max_comp = dev;
+ } else {
+ cur_len = stripe_unit;
+ }
+ if (cur_len >= length)
+ cur_len = length;
+
+ ret = _add_stripe_unit(ios, &cur_pg, page_off , per_dev,
+ cur_len, gfp_flags);
+ if (unlikely(ret))
+ goto out;
+
+ dev += mirrors_p1;
+ dev = (dev % devs_in_group) + first_dev;
+
+ length -= cur_len;
+ ios->length += cur_len;
+ }
+out:
+ ios->numdevs = max_comp + mirrors_p1;
+ *last_pg = cur_pg;
+ return ret;
+}
+
+static int _io_rw_pagelist(struct objio_state *ios, gfp_t gfp_flags)
+{
+ u64 length = ios->ol_state.count;
+ u64 offset = ios->ol_state.offset;
+ struct _striping_info si;
+ unsigned last_pg = 0;
+ int ret = 0;
+
+ while (length) {
+ _calc_stripe_info(ios, offset, &si);
+
+ if (length < si.group_length)
+ si.group_length = length;
+
+ ret = _prepare_one_group(ios, si.group_length, &si, &last_pg, gfp_flags);
+ if (unlikely(ret))
+ goto out;
+
+ offset += si.group_length;
+ length -= si.group_length;
+ }
+
+out:
+ if (!ios->length)
+ return ret;
+
+ 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 int _read_mirrors(struct objio_state *ios, unsigned cur_comp)
+{
+ struct osd_request *or = NULL;
+ struct _objio_per_comp *per_dev = &ios->per_dev[cur_comp];
+ unsigned dev = per_dev->dev;
+ struct pnfs_osd_object_cred *cred =
+ &ios->layout->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(_io_od(ios, dev), GFP_KERNEL);
+ if (unlikely(!or)) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ per_dev->or = or;
+
+ osd_req_read(or, &obj, per_dev->offset, per_dev->bio, per_dev->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] dev=%d obj=0x%llx start=0x%llx length=0x%lx\n",
+ __func__, cur_comp, dev, obj.id, _LLU(per_dev->offset),
+ per_dev->length);
+
+err:
+ return ret;
+}
+
+static ssize_t _read_exec(struct objio_state *ios)
+{
+ unsigned i;
+ int ret;
+
+ for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
+ if (!ios->per_dev[i].length)
+ continue;
+ ret = _read_mirrors(ios, i);
+ if (unlikely(ret))
+ goto err;
+ }
+
+ 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, GFP_KERNEL);
+ 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_mirrors(struct objio_state *ios, unsigned cur_comp)
+{
+ struct _objio_per_comp *master_dev = &ios->per_dev[cur_comp];
+ unsigned dev = ios->per_dev[cur_comp].dev;
+ unsigned last_comp = cur_comp + ios->layout->mirrors_p1;
+ int ret;
+
+ for (; cur_comp < last_comp; ++cur_comp, ++dev) {
+ struct osd_request *or = NULL;
+ struct pnfs_osd_object_cred *cred =
+ &ios->layout->comps[dev];
+ struct osd_obj_id obj = {
+ .partition = cred->oc_object_id.oid_partition_id,
+ .id = cred->oc_object_id.oid_object_id,
+ };
+ struct _objio_per_comp *per_dev = &ios->per_dev[cur_comp];
+ struct bio *bio;
+
+ or = osd_start_request(_io_od(ios, dev), GFP_NOFS);
+ if (unlikely(!or)) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ per_dev->or = or;
+
+ if (per_dev != master_dev) {
+ bio = bio_kmalloc(GFP_NOFS,
+ master_dev->bio->bi_max_vecs);
+ if (unlikely(!bio)) {
+ dprintk("Faild to allocate BIO size=%u\n",
+ master_dev->bio->bi_max_vecs);
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ __bio_clone(bio, master_dev->bio);
+ bio->bi_bdev = NULL;
+ bio->bi_next = NULL;
+ per_dev->bio = bio;
+ per_dev->dev = dev;
+ per_dev->length = master_dev->length;
+ per_dev->offset = master_dev->offset;
+ } else {
+ bio = master_dev->bio;
+ bio->bi_rw |= REQ_WRITE;
+ }
+
+ osd_req_write(or, &obj, per_dev->offset, bio, per_dev->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] dev=%d obj=0x%llx start=0x%llx length=0x%lx\n",
+ __func__, cur_comp, dev, obj.id, _LLU(per_dev->offset),
+ per_dev->length);
+ }
+
+err:
+ return ret;
+}
+
+static ssize_t _write_exec(struct objio_state *ios)
+{
+ unsigned i;
+ int ret;
+
+ for (i = 0; i < ios->numdevs; i += ios->layout->mirrors_p1) {
+ if (!ios->per_dev[i].length)
+ continue;
+ ret = _write_mirrors(ios, i);
+ if (unlikely(ret))
+ goto err;
+ }
+
+ 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, GFP_NOFS);
+ if (unlikely(ret))
+ return ret;
+
+ return _write_exec(ios);
+}
+
+static bool objio_pg_test(struct nfs_pageio_descriptor *pgio,
+ struct nfs_page *prev, struct nfs_page *req)
+{
+ if (!pnfs_generic_pg_test(pgio, prev, req))
+ return false;
+
+ return pgio->pg_count + req->wb_bytes <=
+ OBJIO_LSEG(pgio->pg_lseg)->max_io_size;
+}
+
+static struct pnfs_layoutdriver_type objlayout_type = {
+ .id = LAYOUT_OSD2_OBJECTS,
+ .name = "LAYOUT_OSD2_OBJECTS",
+ .flags = PNFS_LAYOUTRET_ON_SETATTR,
+
+ .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,
+ .pg_test = objio_pg_test,
+
+ .free_deviceid_node = objio_free_deviceid_node,
+
+ .encode_layoutcommit = objlayout_encode_layoutcommit,
+ .encode_layoutreturn = objlayout_encode_layoutreturn,
+};
+
+MODULE_DESCRIPTION("pNFS Layout Driver for OSD2 objects");
+MODULE_AUTHOR("Benny Halevy <bhalevy@panasas.com>");
+MODULE_LICENSE("GPL");
+
+static int __init
+objlayout_init(void)
+{
+ int ret = pnfs_register_layoutdriver(&objlayout_type);
+
+ if (ret)
+ printk(KERN_INFO
+ "%s: Registering OSD pNFS Layout Driver failed: error=%d\n",
+ __func__, ret);
+ else
+ printk(KERN_INFO "%s: Registered OSD pNFS Layout Driver\n",
+ __func__);
+ return ret;
+}
+
+static void __exit
+objlayout_exit(void)
+{
+ pnfs_unregister_layoutdriver(&objlayout_type);
+ printk(KERN_INFO "%s: Unregistered OSD pNFS Layout Driver\n",
+ __func__);
+}
+
+module_init(objlayout_init);
+module_exit(objlayout_exit);