mirror of https://gitee.com/openkylin/linux.git
707 lines
19 KiB
C
707 lines
19 KiB
C
/*
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* pNFS Objects layout implementation over open-osd initiator library
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*
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* Copyright (C) 2009 Panasas Inc. [year of first publication]
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* All rights reserved.
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*
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* Benny Halevy <bhalevy@panasas.com>
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* See the file COPYING included with this distribution for more details.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Panasas company nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/module.h>
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#include <scsi/osd_ore.h>
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#include "objlayout.h"
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#include "../internal.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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struct objio_dev_ent {
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struct nfs4_deviceid_node id_node;
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struct ore_dev od;
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};
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static void
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objio_free_deviceid_node(struct nfs4_deviceid_node *d)
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{
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struct objio_dev_ent *de = container_of(d, struct objio_dev_ent, id_node);
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dprintk("%s: free od=%p\n", __func__, de->od.od);
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osduld_put_device(de->od.od);
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kfree(de);
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}
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static struct objio_dev_ent *_dev_list_find(const struct nfs_server *nfss,
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const struct nfs4_deviceid *d_id)
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{
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struct nfs4_deviceid_node *d;
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struct objio_dev_ent *de;
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d = nfs4_find_get_deviceid(nfss->pnfs_curr_ld, nfss->nfs_client, d_id);
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if (!d)
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return NULL;
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de = container_of(d, struct objio_dev_ent, id_node);
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return de;
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}
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static struct objio_dev_ent *
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_dev_list_add(const struct nfs_server *nfss,
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const struct nfs4_deviceid *d_id, struct osd_dev *od,
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gfp_t gfp_flags)
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{
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struct nfs4_deviceid_node *d;
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struct objio_dev_ent *de = kzalloc(sizeof(*de), gfp_flags);
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struct objio_dev_ent *n;
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if (!de) {
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dprintk("%s: -ENOMEM od=%p\n", __func__, od);
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return NULL;
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}
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dprintk("%s: Adding od=%p\n", __func__, od);
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nfs4_init_deviceid_node(&de->id_node,
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nfss->pnfs_curr_ld,
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nfss->nfs_client,
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d_id);
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de->od.od = od;
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d = nfs4_insert_deviceid_node(&de->id_node);
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n = container_of(d, struct objio_dev_ent, id_node);
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if (n != de) {
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dprintk("%s: Race with other n->od=%p\n", __func__, n->od.od);
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objio_free_deviceid_node(&de->id_node);
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de = n;
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}
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return de;
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}
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struct objio_segment {
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struct pnfs_layout_segment lseg;
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struct ore_layout layout;
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struct ore_components oc;
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};
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static inline struct objio_segment *
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OBJIO_LSEG(struct pnfs_layout_segment *lseg)
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{
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return container_of(lseg, struct objio_segment, lseg);
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}
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struct objio_state {
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/* Generic layer */
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struct objlayout_io_res oir;
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bool sync;
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/*FIXME: Support for extra_bytes at ore_get_rw_state() */
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struct ore_io_state *ios;
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};
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/* Send and wait for a get_device_info of devices in the layout,
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then look them up with the osd_initiator library */
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static int objio_devices_lookup(struct pnfs_layout_hdr *pnfslay,
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struct objio_segment *objio_seg, unsigned c, struct nfs4_deviceid *d_id,
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gfp_t gfp_flags)
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{
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struct pnfs_osd_deviceaddr *deviceaddr;
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struct objio_dev_ent *ode;
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struct osd_dev *od;
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struct osd_dev_info odi;
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bool retry_flag = true;
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int err;
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ode = _dev_list_find(NFS_SERVER(pnfslay->plh_inode), d_id);
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if (ode) {
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objio_seg->oc.ods[c] = &ode->od; /* must use container_of */
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return 0;
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}
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err = objlayout_get_deviceinfo(pnfslay, d_id, &deviceaddr, gfp_flags);
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if (unlikely(err)) {
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dprintk("%s: objlayout_get_deviceinfo dev(%llx:%llx) =>%d\n",
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__func__, _DEVID_LO(d_id), _DEVID_HI(d_id), err);
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return err;
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}
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odi.systemid_len = deviceaddr->oda_systemid.len;
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if (odi.systemid_len > sizeof(odi.systemid)) {
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dprintk("%s: odi.systemid_len > sizeof(systemid=%zd)\n",
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__func__, sizeof(odi.systemid));
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err = -EINVAL;
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goto out;
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} else if (odi.systemid_len)
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memcpy(odi.systemid, deviceaddr->oda_systemid.data,
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odi.systemid_len);
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odi.osdname_len = deviceaddr->oda_osdname.len;
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odi.osdname = (u8 *)deviceaddr->oda_osdname.data;
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if (!odi.osdname_len && !odi.systemid_len) {
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dprintk("%s: !odi.osdname_len && !odi.systemid_len\n",
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__func__);
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err = -ENODEV;
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goto out;
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}
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retry_lookup:
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od = osduld_info_lookup(&odi);
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if (unlikely(IS_ERR(od))) {
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err = PTR_ERR(od);
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dprintk("%s: osduld_info_lookup => %d\n", __func__, err);
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if (err == -ENODEV && retry_flag) {
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err = objlayout_autologin(deviceaddr);
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if (likely(!err)) {
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retry_flag = false;
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goto retry_lookup;
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}
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}
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goto out;
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}
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ode = _dev_list_add(NFS_SERVER(pnfslay->plh_inode), d_id, od,
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gfp_flags);
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objio_seg->oc.ods[c] = &ode->od; /* must use container_of */
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dprintk("Adding new dev_id(%llx:%llx)\n",
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_DEVID_LO(d_id), _DEVID_HI(d_id));
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out:
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objlayout_put_deviceinfo(deviceaddr);
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return err;
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}
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static void copy_single_comp(struct ore_components *oc, unsigned c,
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struct pnfs_osd_object_cred *src_comp)
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{
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struct ore_comp *ocomp = &oc->comps[c];
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WARN_ON(src_comp->oc_cap_key.cred_len > 0); /* libosd is NO_SEC only */
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WARN_ON(src_comp->oc_cap.cred_len > sizeof(ocomp->cred));
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ocomp->obj.partition = src_comp->oc_object_id.oid_partition_id;
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ocomp->obj.id = src_comp->oc_object_id.oid_object_id;
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memcpy(ocomp->cred, src_comp->oc_cap.cred, sizeof(ocomp->cred));
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}
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static int __alloc_objio_seg(unsigned numdevs, gfp_t gfp_flags,
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struct objio_segment **pseg)
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{
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/* This is the in memory structure of the objio_segment
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*
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* struct __alloc_objio_segment {
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* struct objio_segment olseg;
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* struct ore_dev *ods[numdevs];
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* struct ore_comp comps[numdevs];
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* } *aolseg;
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* NOTE: The code as above compiles and runs perfectly. It is elegant,
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* type safe and compact. At some Past time Linus has decided he does not
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* like variable length arrays, For the sake of this principal we uglify
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* the code as below.
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*/
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struct objio_segment *lseg;
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size_t lseg_size = sizeof(*lseg) +
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numdevs * sizeof(lseg->oc.ods[0]) +
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numdevs * sizeof(*lseg->oc.comps);
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lseg = kzalloc(lseg_size, gfp_flags);
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if (unlikely(!lseg)) {
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dprintk("%s: Failed allocation numdevs=%d size=%zd\n", __func__,
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numdevs, lseg_size);
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return -ENOMEM;
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}
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lseg->oc.numdevs = numdevs;
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lseg->oc.single_comp = EC_MULTPLE_COMPS;
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lseg->oc.ods = (void *)(lseg + 1);
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lseg->oc.comps = (void *)(lseg->oc.ods + numdevs);
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*pseg = lseg;
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return 0;
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}
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int objio_alloc_lseg(struct pnfs_layout_segment **outp,
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struct pnfs_layout_hdr *pnfslay,
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struct pnfs_layout_range *range,
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struct xdr_stream *xdr,
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gfp_t gfp_flags)
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{
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struct objio_segment *objio_seg;
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struct pnfs_osd_xdr_decode_layout_iter iter;
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struct pnfs_osd_layout layout;
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struct pnfs_osd_object_cred src_comp;
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unsigned cur_comp;
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int err;
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err = pnfs_osd_xdr_decode_layout_map(&layout, &iter, xdr);
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if (unlikely(err))
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return err;
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err = __alloc_objio_seg(layout.olo_num_comps, gfp_flags, &objio_seg);
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if (unlikely(err))
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return err;
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objio_seg->layout.stripe_unit = layout.olo_map.odm_stripe_unit;
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objio_seg->layout.group_width = layout.olo_map.odm_group_width;
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objio_seg->layout.group_depth = layout.olo_map.odm_group_depth;
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objio_seg->layout.mirrors_p1 = layout.olo_map.odm_mirror_cnt + 1;
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objio_seg->layout.raid_algorithm = layout.olo_map.odm_raid_algorithm;
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err = ore_verify_layout(layout.olo_map.odm_num_comps,
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&objio_seg->layout);
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if (unlikely(err))
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goto err;
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objio_seg->oc.first_dev = layout.olo_comps_index;
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cur_comp = 0;
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while (pnfs_osd_xdr_decode_layout_comp(&src_comp, &iter, xdr, &err)) {
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copy_single_comp(&objio_seg->oc, cur_comp, &src_comp);
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err = objio_devices_lookup(pnfslay, objio_seg, cur_comp,
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&src_comp.oc_object_id.oid_device_id,
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gfp_flags);
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if (err)
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goto err;
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++cur_comp;
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}
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/* pnfs_osd_xdr_decode_layout_comp returns false on error */
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if (unlikely(err))
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goto err;
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*outp = &objio_seg->lseg;
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return 0;
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err:
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kfree(objio_seg);
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dprintk("%s: Error: return %d\n", __func__, err);
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*outp = NULL;
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return err;
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}
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void objio_free_lseg(struct pnfs_layout_segment *lseg)
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{
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int i;
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struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
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for (i = 0; i < objio_seg->oc.numdevs; i++) {
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struct ore_dev *od = objio_seg->oc.ods[i];
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struct objio_dev_ent *ode;
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if (!od)
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break;
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ode = container_of(od, typeof(*ode), od);
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nfs4_put_deviceid_node(&ode->id_node);
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}
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kfree(objio_seg);
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}
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static int
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objio_alloc_io_state(struct pnfs_layout_hdr *pnfs_layout_type, bool is_reading,
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struct pnfs_layout_segment *lseg, struct page **pages, unsigned pgbase,
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loff_t offset, size_t count, void *rpcdata, gfp_t gfp_flags,
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struct objio_state **outp)
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{
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struct objio_segment *objio_seg = OBJIO_LSEG(lseg);
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struct ore_io_state *ios;
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int ret;
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struct __alloc_objio_state {
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struct objio_state objios;
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struct pnfs_osd_ioerr ioerrs[objio_seg->oc.numdevs];
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} *aos;
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aos = kzalloc(sizeof(*aos), gfp_flags);
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if (unlikely(!aos))
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return -ENOMEM;
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objlayout_init_ioerrs(&aos->objios.oir, objio_seg->oc.numdevs,
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aos->ioerrs, rpcdata, pnfs_layout_type);
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ret = ore_get_rw_state(&objio_seg->layout, &objio_seg->oc, is_reading,
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offset, count, &ios);
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if (unlikely(ret)) {
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kfree(aos);
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return ret;
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}
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ios->pages = pages;
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ios->pgbase = pgbase;
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ios->private = aos;
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BUG_ON(ios->nr_pages > (pgbase + count + PAGE_SIZE - 1) >> PAGE_SHIFT);
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aos->objios.sync = 0;
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aos->objios.ios = ios;
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*outp = &aos->objios;
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return 0;
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}
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void objio_free_result(struct objlayout_io_res *oir)
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{
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struct objio_state *objios = container_of(oir, struct objio_state, oir);
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ore_put_io_state(objios->ios);
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kfree(objios);
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}
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static enum pnfs_osd_errno osd_pri_2_pnfs_err(enum osd_err_priority oep)
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{
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switch (oep) {
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case OSD_ERR_PRI_NO_ERROR:
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return (enum pnfs_osd_errno)0;
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case OSD_ERR_PRI_CLEAR_PAGES:
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BUG_ON(1);
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return 0;
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case OSD_ERR_PRI_RESOURCE:
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return PNFS_OSD_ERR_RESOURCE;
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case OSD_ERR_PRI_BAD_CRED:
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return PNFS_OSD_ERR_BAD_CRED;
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case OSD_ERR_PRI_NO_ACCESS:
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return PNFS_OSD_ERR_NO_ACCESS;
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case OSD_ERR_PRI_UNREACHABLE:
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return PNFS_OSD_ERR_UNREACHABLE;
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case OSD_ERR_PRI_NOT_FOUND:
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return PNFS_OSD_ERR_NOT_FOUND;
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case OSD_ERR_PRI_NO_SPACE:
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return PNFS_OSD_ERR_NO_SPACE;
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default:
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WARN_ON(1);
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/* fallthrough */
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case OSD_ERR_PRI_EIO:
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return PNFS_OSD_ERR_EIO;
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}
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}
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static void __on_dev_error(struct ore_io_state *ios,
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struct ore_dev *od, unsigned dev_index, enum osd_err_priority oep,
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u64 dev_offset, u64 dev_len)
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{
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struct objio_state *objios = ios->private;
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struct pnfs_osd_objid pooid;
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struct objio_dev_ent *ode = container_of(od, typeof(*ode), od);
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/* FIXME: what to do with more-then-one-group layouts. We need to
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* translate from ore_io_state index to oc->comps index
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*/
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unsigned comp = dev_index;
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pooid.oid_device_id = ode->id_node.deviceid;
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pooid.oid_partition_id = ios->oc->comps[comp].obj.partition;
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pooid.oid_object_id = ios->oc->comps[comp].obj.id;
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objlayout_io_set_result(&objios->oir, comp,
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&pooid, osd_pri_2_pnfs_err(oep),
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dev_offset, dev_len, !ios->reading);
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}
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/*
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* read
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*/
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static void _read_done(struct ore_io_state *ios, void *private)
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{
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struct objio_state *objios = private;
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ssize_t status;
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int ret = ore_check_io(ios, &__on_dev_error);
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/* FIXME: _io_free(ios) can we dealocate the libosd resources; */
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if (likely(!ret))
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status = ios->length;
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else
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status = ret;
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objlayout_read_done(&objios->oir, status, objios->sync);
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}
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int objio_read_pagelist(struct nfs_pgio_data *rdata)
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{
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struct nfs_pgio_header *hdr = rdata->header;
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struct objio_state *objios;
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int ret;
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ret = objio_alloc_io_state(NFS_I(hdr->inode)->layout, true,
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hdr->lseg, rdata->args.pages, rdata->args.pgbase,
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rdata->args.offset, rdata->args.count, rdata,
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GFP_KERNEL, &objios);
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if (unlikely(ret))
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return ret;
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objios->ios->done = _read_done;
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dprintk("%s: offset=0x%llx length=0x%x\n", __func__,
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rdata->args.offset, rdata->args.count);
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ret = ore_read(objios->ios);
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if (unlikely(ret))
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objio_free_result(&objios->oir);
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return ret;
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}
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/*
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* write
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*/
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static void _write_done(struct ore_io_state *ios, void *private)
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{
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struct objio_state *objios = private;
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ssize_t status;
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int ret = ore_check_io(ios, &__on_dev_error);
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|
|
/* 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_data *wdata = objios->oir.rpcdata;
|
|
struct address_space *mapping = wdata->header->inode->i_mapping;
|
|
pgoff_t index = offset / PAGE_SIZE;
|
|
struct page *page;
|
|
loff_t i_size = i_size_read(wdata->header->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_data *wdata, int how)
|
|
{
|
|
struct nfs_pgio_header *hdr = wdata->header;
|
|
struct objio_state *objios;
|
|
int ret;
|
|
|
|
ret = objio_alloc_io_state(NFS_I(hdr->inode)->layout, false,
|
|
hdr->lseg, wdata->args.pages, wdata->args.pgbase,
|
|
wdata->args.offset, wdata->args.count, wdata, 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__,
|
|
wdata->args.offset, wdata->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)
|
|
{
|
|
unsigned int size;
|
|
|
|
size = pnfs_generic_pg_test(pgio, prev, req);
|
|
|
|
if (!size || pgio->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,
|
|
};
|
|
|
|
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,
|
|
};
|
|
|
|
static struct pnfs_layoutdriver_type objlayout_type = {
|
|
.id = LAYOUT_OSD2_OBJECTS,
|
|
.name = "LAYOUT_OSD2_OBJECTS",
|
|
.flags = PNFS_LAYOUTRET_ON_SETATTR |
|
|
PNFS_LAYOUTRET_ON_ERROR,
|
|
|
|
.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,
|
|
|
|
.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);
|