--- /dev/null
+/*
+ * 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 <ooo@electrozaur.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_ore.h>
+
+#include "objlayout.h"
+#include "../internal.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+struct objio_dev_ent {
+ struct nfs4_deviceid_node id_node;
+ struct ore_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.od);
+ osduld_put_device(de->od.od);
+ kfree_rcu(d, rcu);
+}
+
+struct objio_segment {
+ struct pnfs_layout_segment lseg;
+
+ struct ore_layout layout;
+ struct ore_components oc;
+};
+
+static inline struct objio_segment *
+OBJIO_LSEG(struct pnfs_layout_segment *lseg)
+{
+ return container_of(lseg, struct objio_segment, lseg);
+}
+
+struct objio_state {
+ /* Generic layer */
+ struct objlayout_io_res oir;
+
+ bool sync;
+ /*FIXME: Support for extra_bytes at ore_get_rw_state() */
+ struct ore_io_state *ios;
+};
+
+/* Send and wait for a get_device_info of devices in the layout,
+ then look them up with the osd_initiator library */
+struct nfs4_deviceid_node *
+objio_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
+ gfp_t gfp_flags)
+{
+ struct pnfs_osd_deviceaddr *deviceaddr;
+ struct objio_dev_ent *ode = NULL;
+ struct osd_dev *od;
+ struct osd_dev_info odi;
+ bool retry_flag = true;
+ __be32 *p;
+ int err;
+
+ deviceaddr = kzalloc(sizeof(*deviceaddr), gfp_flags);
+ if (!deviceaddr)
+ return NULL;
+
+ p = page_address(pdev->pages[0]);
+ pnfs_osd_xdr_decode_deviceaddr(deviceaddr, p);
+
+ odi.systemid_len = deviceaddr->oda_systemid.len;
+ if (odi.systemid_len > sizeof(odi.systemid)) {
+ dprintk("%s: odi.systemid_len > sizeof(systemid=%zd)\n",
+ __func__, 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;
+ }
+
+retry_lookup:
+ od = osduld_info_lookup(&odi);
+ if (unlikely(IS_ERR(od))) {
+ err = PTR_ERR(od);
+ dprintk("%s: osduld_info_lookup => %d\n", __func__, err);
+ if (err == -ENODEV && retry_flag) {
+ err = objlayout_autologin(deviceaddr);
+ if (likely(!err)) {
+ retry_flag = false;
+ goto retry_lookup;
+ }
+ }
+ goto out;
+ }
+
+ dprintk("Adding new dev_id(%llx:%llx)\n",
+ _DEVID_LO(&pdev->dev_id), _DEVID_HI(&pdev->dev_id));
+
+ ode = kzalloc(sizeof(*ode), gfp_flags);
+ if (!ode) {
+ dprintk("%s: -ENOMEM od=%p\n", __func__, od);
+ goto out;
+ }
+
+ nfs4_init_deviceid_node(&ode->id_node, server, &pdev->dev_id);
+ kfree(deviceaddr);
+
+ ode->od.od = od;
+ return &ode->id_node;
+
+out:
+ kfree(deviceaddr);
+ return NULL;
+}
+
+static void copy_single_comp(struct ore_components *oc, unsigned c,
+ struct pnfs_osd_object_cred *src_comp)
+{
+ struct ore_comp *ocomp = &oc->comps[c];
+
+ WARN_ON(src_comp->oc_cap_key.cred_len > 0); /* libosd is NO_SEC only */
+ WARN_ON(src_comp->oc_cap.cred_len > sizeof(ocomp->cred));
+
+ ocomp->obj.partition = src_comp->oc_object_id.oid_partition_id;
+ ocomp->obj.id = src_comp->oc_object_id.oid_object_id;
+
+ memcpy(ocomp->cred, src_comp->oc_cap.cred, sizeof(ocomp->cred));
+}
+
+static int __alloc_objio_seg(unsigned numdevs, gfp_t gfp_flags,
+ struct objio_segment **pseg)
+{
+/* This is the in memory structure of the objio_segment
+ *
+ * struct __alloc_objio_segment {
+ * struct objio_segment olseg;
+ * struct ore_dev *ods[numdevs];
+ * struct ore_comp comps[numdevs];
+ * } *aolseg;
+ * NOTE: The code as above compiles and runs perfectly. It is elegant,
+ * type safe and compact. At some Past time Linus has decided he does not
+ * like variable length arrays, For the sake of this principal we uglify
+ * the code as below.
+ */
+ struct objio_segment *lseg;
+ size_t lseg_size = sizeof(*lseg) +
+ numdevs * sizeof(lseg->oc.ods[0]) +
+ numdevs * sizeof(*lseg->oc.comps);
+
+ lseg = kzalloc(lseg_size, gfp_flags);
+ if (unlikely(!lseg)) {
+ dprintk("%s: Failed allocation numdevs=%d size=%zd\n", __func__,
+ numdevs, lseg_size);
+ return -ENOMEM;
+ }
+
+ lseg->oc.numdevs = numdevs;
+ lseg->oc.single_comp = EC_MULTPLE_COMPS;
+ lseg->oc.ods = (void *)(lseg + 1);
+ lseg->oc.comps = (void *)(lseg->oc.ods + numdevs);
+
+ *pseg = lseg;
+ return 0;
+}
+
+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 nfs_server *server = NFS_SERVER(pnfslay->plh_inode);
+ struct objio_segment *objio_seg;
+ struct pnfs_osd_xdr_decode_layout_iter iter;
+ struct pnfs_osd_layout layout;
+ struct pnfs_osd_object_cred src_comp;
+ unsigned cur_comp;
+ int err;
+
+ err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
+ if (unlikely(err))
+ return err;
+
+ err = __alloc_objio_seg(layout.olo_num_comps, gfp_flags, &objio_seg);
+ if (unlikely(err))
+ return err;
+
+ objio_seg->layout.stripe_unit = layout.olo_map.odm_stripe_unit;
+ objio_seg->layout.group_width = layout.olo_map.odm_group_width;
+ objio_seg->layout.group_depth = layout.olo_map.odm_group_depth;
+ objio_seg->layout.mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1;
+ objio_seg->layout.raid_algorithm = layout.olo_map.odm_raid_algorithm;
+
+ err = ore_verify_layout(layout.olo_map.odm_num_comps,
+ &objio_seg->layout);
+ if (unlikely(err))
+ goto err;
+
+ objio_seg->oc.first_dev = layout.olo_comps_index;
+ cur_comp = 0;
+ while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err)) {
+ struct nfs4_deviceid_node *d;
+ struct objio_dev_ent *ode;
+
+ copy_single_comp(&objio_seg->oc, cur_comp, &src_comp);
+
+ d = nfs4_find_get_deviceid(server,
+ &src_comp.oc_object_id.oid_device_id,
+ pnfslay->plh_lc_cred, gfp_flags);
+ if (!d) {
+ err = -ENXIO;
+ goto err;
+ }
+
+ ode = container_of(d, struct objio_dev_ent, id_node);
+ objio_seg->oc.ods[cur_comp++] = &ode->od;
+ }
+ /* pnfs_osd_xdr_decode_layout_comp returns false on error */
+ if (unlikely(err))
+ goto err;
+
+ *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->oc.numdevs; i++) {
+ struct ore_dev *od = objio_seg->oc.ods[i];
+ struct objio_dev_ent *ode;
+
+ if (!od)
+ break;
+ ode = container_of(od, typeof(*ode), od);
+ nfs4_put_deviceid_node(&ode->id_node);
+ }
+ kfree(objio_seg);
+}
+
+static int
+objio_alloc_io_state(struct pnfs_layout_hdr *pnfs_layout_type, bool is_reading,
+ struct pnfs_layout_segment *lseg, struct page **pages, unsigned pgbase,
+ loff_t offset, size_t count, void *rpcdata, gfp_t gfp_flags,
+ struct objio_state **outp)
+{
+ struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
+ struct ore_io_state *ios;
+ int ret;
+ struct __alloc_objio_state {
+ struct objio_state objios;
+ struct pnfs_osd_ioerr ioerrs[objio_seg->oc.numdevs];
+ } *aos;
+
+ aos = kzalloc(sizeof(*aos), gfp_flags);
+ if (unlikely(!aos))
+ return -ENOMEM;
+
+ objlayout_init_ioerrs(&aos->objios.oir, objio_seg->oc.numdevs,
+ aos->ioerrs, rpcdata, pnfs_layout_type);
+
+ ret = ore_get_rw_state(&objio_seg->layout, &objio_seg->oc, is_reading,
+ offset, count, &ios);
+ if (unlikely(ret)) {
+ kfree(aos);
+ return ret;
+ }
+
+ ios->pages = pages;
+ ios->pgbase = pgbase;
+ ios->private = aos;
+ BUG_ON(ios->nr_pages > (pgbase + count + PAGE_SIZE - 1) >> PAGE_SHIFT);
+
+ aos->objios.sync = 0;
+ aos->objios.ios = ios;
+ *outp = &aos->objios;
+ return 0;
+}
+
+void objio_free_result(struct objlayout_io_res *oir)
+{
+ struct objio_state *objios = container_of(oir, struct objio_state, oir);
+
+ ore_put_io_state(objios->ios);
+ kfree(objios);
+}
+
+static 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 __on_dev_error(struct ore_io_state *ios,
+ struct ore_dev *od, unsigned dev_index, enum osd_err_priority oep,
+ u64 dev_offset, u64 dev_len)
+{
+ struct objio_state *objios = ios->private;
+ struct pnfs_osd_objid pooid;
+ struct objio_dev_ent *ode = container_of(od, typeof(*ode), od);
+ /* FIXME: what to do with more-then-one-group layouts. We need to
+ * translate from ore_io_state index to oc->comps index
+ */
+ unsigned comp = dev_index;
+
+ pooid.oid_device_id = ode->id_node.deviceid;
+ pooid.oid_partition_id = ios->oc->comps[comp].obj.partition;
+ pooid.oid_object_id = ios->oc->comps[comp].obj.id;
+
+ objlayout_io_set_result(&objios->oir, comp,
+ &pooid, osd_pri_2_pnfs_err(oep),
+ dev_offset, dev_len, !ios->reading);
+}
+
+/*
+ * read
+ */
+static void _read_done(struct ore_io_state *ios, void *private)
+{
+ struct objio_state *objios = private;
+ ssize_t status;
+ int ret = ore_check_io(ios, &__on_dev_error);
+
+ /* FIXME: _io_free(ios) can we dealocate the libosd resources; */
+
+ if (likely(!ret))
+ status = ios->length;
+ else
+ status = ret;
+
+ objlayout_read_done(&objios->oir, status, objios->sync);
+}
+
+int objio_read_pagelist(struct nfs_pgio_header *hdr)
+{
+ struct objio_state *objios;
+ int ret;
+
+ ret = objio_alloc_io_state(NFS_I(hdr->inode)->layout, true,
+ hdr->lseg, hdr->args.pages, hdr->args.pgbase,
+ hdr->args.offset, hdr->args.count, hdr,
+ GFP_KERNEL, &objios);
+ if (unlikely(ret))
+ return ret;
+
+ objios->ios->done = _read_done;
+ dprintk("%s: offset=0x%llx length=0x%x\n", __func__,
+ hdr->args.offset, hdr->args.count);
+ ret = ore_read(objios->ios);
+ if (unlikely(ret))
+ objio_free_result(&objios->oir);
+ return ret;
+}
+
+/*
+ * write
+ */
+static void _write_done(struct ore_io_state *ios, void *private)
+{
+ struct objio_state *objios = private;
+ ssize_t status;
+ int ret = ore_check_io(ios, &__on_dev_error);
+
+ /* FIXME: _io_free(ios) can we dealocate the libosd resources; */
+
+ if (likely(!ret)) {
+ /* FIXME: should be based on the OSD's persistence model
+ * See OSD2r05 Section 4.13 Data persistence model */
+ objios->oir.committed = NFS_FILE_SYNC;
+ status = ios->length;
+ } else {
+ status = ret;
+ }
+
+ objlayout_write_done(&objios->oir, status, objios->sync);
+}
+
+static struct page *__r4w_get_page(void *priv, u64 offset, bool *uptodate)
+{
+ struct objio_state *objios = priv;
+ struct nfs_pgio_header *hdr = objios->oir.rpcdata;
+ struct address_space *mapping = hdr->inode->i_mapping;
+ pgoff_t index = offset / PAGE_SIZE;
+ struct page *page;
+ loff_t i_size = i_size_read(hdr->inode);
+
+ if (offset >= i_size) {
+ *uptodate = true;
+ dprintk("%s: g_zero_page index=0x%lx\n", __func__, index);
+ return ZERO_PAGE(0);
+ }
+
+ page = find_get_page(mapping, index);
+ if (!page) {
+ page = find_or_create_page(mapping, index, GFP_NOFS);
+ if (unlikely(!page)) {
+ dprintk("%s: grab_cache_page Failed index=0x%lx\n",
+ __func__, index);
+ return NULL;
+ }
+ unlock_page(page);
+ }
+ if (PageDirty(page) || PageWriteback(page))
+ *uptodate = true;
+ else
+ *uptodate = PageUptodate(page);
+ dprintk("%s: index=0x%lx uptodate=%d\n", __func__, index, *uptodate);
+ return page;
+}
+
+static void __r4w_put_page(void *priv, struct page *page)
+{
+ dprintk("%s: index=0x%lx\n", __func__,
+ (page == ZERO_PAGE(0)) ? -1UL : page->index);
+ if (ZERO_PAGE(0) != page)
+ page_cache_release(page);
+ return;
+}
+
+static const struct _ore_r4w_op _r4w_op = {
+ .get_page = &__r4w_get_page,
+ .put_page = &__r4w_put_page,
+};
+
+int objio_write_pagelist(struct nfs_pgio_header *hdr, int how)
+{
+ struct objio_state *objios;
+ int ret;
+
+ ret = objio_alloc_io_state(NFS_I(hdr->inode)->layout, false,
+ hdr->lseg, hdr->args.pages, hdr->args.pgbase,
+ hdr->args.offset, hdr->args.count, hdr, GFP_NOFS,
+ &objios);
+ if (unlikely(ret))
+ return ret;
+
+ objios->sync = 0 != (how & FLUSH_SYNC);
+ objios->ios->r4w = &_r4w_op;
+
+ if (!objios->sync)
+ objios->ios->done = _write_done;
+
+ dprintk("%s: offset=0x%llx length=0x%x\n", __func__,
+ hdr->args.offset, hdr->args.count);
+ ret = ore_write(objios->ios);
+ if (unlikely(ret)) {
+ objio_free_result(&objios->oir);
+ return ret;
+ }
+
+ if (objios->sync)
+ _write_done(objios->ios, objios);
+
+ return 0;
+}
+
+/*
+ * Return 0 if @req cannot be coalesced into @pgio, otherwise return the number
+ * of bytes (maximum @req->wb_bytes) that can be coalesced.
+ */
+static size_t objio_pg_test(struct nfs_pageio_descriptor *pgio,
+ struct nfs_page *prev, struct nfs_page *req)
+{
+ struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(pgio);
+ unsigned int size;
+
+ size = pnfs_generic_pg_test(pgio, prev, req);
+
+ if (!size || mirror->pg_count + req->wb_bytes >
+ (unsigned long)pgio->pg_layout_private)
+ return 0;
+
+ return min(size, req->wb_bytes);
+}
+
+static void objio_init_read(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
+{
+ pnfs_generic_pg_init_read(pgio, req);
+ if (unlikely(pgio->pg_lseg == NULL))
+ return; /* Not pNFS */
+
+ pgio->pg_layout_private = (void *)
+ OBJIO_LSEG(pgio->pg_lseg)->layout.max_io_length;
+}
+
+static bool aligned_on_raid_stripe(u64 offset, struct ore_layout *layout,
+ unsigned long *stripe_end)
+{
+ u32 stripe_off;
+ unsigned stripe_size;
+
+ if (layout->raid_algorithm == PNFS_OSD_RAID_0)
+ return true;
+
+ stripe_size = layout->stripe_unit *
+ (layout->group_width - layout->parity);
+
+ div_u64_rem(offset, stripe_size, &stripe_off);
+ if (!stripe_off)
+ return true;
+
+ *stripe_end = stripe_size - stripe_off;
+ return false;
+}
+
+static void objio_init_write(struct nfs_pageio_descriptor *pgio, struct nfs_page *req)
+{
+ unsigned long stripe_end = 0;
+ u64 wb_size;
+
+ if (pgio->pg_dreq == NULL)
+ wb_size = i_size_read(pgio->pg_inode) - req_offset(req);
+ else
+ wb_size = nfs_dreq_bytes_left(pgio->pg_dreq);
+
+ pnfs_generic_pg_init_write(pgio, req, wb_size);
+ if (unlikely(pgio->pg_lseg == NULL))
+ return; /* Not pNFS */
+
+ if (req->wb_offset ||
+ !aligned_on_raid_stripe(req->wb_index * PAGE_SIZE,
+ &OBJIO_LSEG(pgio->pg_lseg)->layout,
+ &stripe_end)) {
+ pgio->pg_layout_private = (void *)stripe_end;
+ } else {
+ pgio->pg_layout_private = (void *)
+ OBJIO_LSEG(pgio->pg_lseg)->layout.max_io_length;
+ }
+}
+
+static const struct nfs_pageio_ops objio_pg_read_ops = {
+ .pg_init = objio_init_read,
+ .pg_test = objio_pg_test,
+ .pg_doio = pnfs_generic_pg_readpages,
+ .pg_cleanup = pnfs_generic_pg_cleanup,
+};
+
+static const struct nfs_pageio_ops objio_pg_write_ops = {
+ .pg_init = objio_init_write,
+ .pg_test = objio_pg_test,
+ .pg_doio = pnfs_generic_pg_writepages,
+ .pg_cleanup = pnfs_generic_pg_cleanup,
+};
+
+static struct pnfs_layoutdriver_type objlayout_type = {
+ .id = LAYOUT_OSD2_OBJECTS,
+ .name = "LAYOUT_OSD2_OBJECTS",
+ .flags = PNFS_LAYOUTRET_ON_SETATTR |
+ PNFS_LAYOUTRET_ON_ERROR,
+
+ .max_deviceinfo_size = PAGE_SIZE,
+ .owner = THIS_MODULE,
+ .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_read_ops = &objio_pg_read_ops,
+ .pg_write_ops = &objio_pg_write_ops,
+
+ .sync = pnfs_generic_sync,
+
+ .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
+ "NFS: %s: Registering OSD pNFS Layout Driver failed: error=%d\n",
+ __func__, ret);
+ else
+ printk(KERN_INFO "NFS: %s: Registered OSD pNFS Layout Driver\n",
+ __func__);
+ return ret;
+}
+
+static void __exit
+objlayout_exit(void)
+{
+ pnfs_unregister_layoutdriver(&objlayout_type);
+ printk(KERN_INFO "NFS: %s: Unregistered OSD pNFS Layout Driver\n",
+ __func__);
+}
+
+MODULE_ALIAS("nfs-layouttype4-2");
+
+module_init(objlayout_init);
+module_exit(objlayout_exit);
Code Review / kvmfornfv.git / blobdiff