--- /dev/null
+/*
+ * Copyright (c) 2014 Christoph Hellwig.
+ */
+#include <linux/kmod.h>
+#include <linux/file.h>
+#include <linux/jhash.h>
+#include <linux/sched.h>
+#include <linux/sunrpc/addr.h>
+
+#include "pnfs.h"
+#include "netns.h"
+#include "trace.h"
+
+#define NFSDDBG_FACILITY NFSDDBG_PNFS
+
+struct nfs4_layout {
+ struct list_head lo_perstate;
+ struct nfs4_layout_stateid *lo_state;
+ struct nfsd4_layout_seg lo_seg;
+};
+
+static struct kmem_cache *nfs4_layout_cache;
+static struct kmem_cache *nfs4_layout_stateid_cache;
+
+static struct nfsd4_callback_ops nfsd4_cb_layout_ops;
+static const struct lock_manager_operations nfsd4_layouts_lm_ops;
+
+const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = {
+ [LAYOUT_BLOCK_VOLUME] = &bl_layout_ops,
+};
+
+/* pNFS device ID to export fsid mapping */
+#define DEVID_HASH_BITS 8
+#define DEVID_HASH_SIZE (1 << DEVID_HASH_BITS)
+#define DEVID_HASH_MASK (DEVID_HASH_SIZE - 1)
+static u64 nfsd_devid_seq = 1;
+static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE];
+static DEFINE_SPINLOCK(nfsd_devid_lock);
+
+static inline u32 devid_hashfn(u64 idx)
+{
+ return jhash_2words(idx, idx >> 32, 0) & DEVID_HASH_MASK;
+}
+
+static void
+nfsd4_alloc_devid_map(const struct svc_fh *fhp)
+{
+ const struct knfsd_fh *fh = &fhp->fh_handle;
+ size_t fsid_len = key_len(fh->fh_fsid_type);
+ struct nfsd4_deviceid_map *map, *old;
+ int i;
+
+ map = kzalloc(sizeof(*map) + fsid_len, GFP_KERNEL);
+ if (!map)
+ return;
+
+ map->fsid_type = fh->fh_fsid_type;
+ memcpy(&map->fsid, fh->fh_fsid, fsid_len);
+
+ spin_lock(&nfsd_devid_lock);
+ if (fhp->fh_export->ex_devid_map)
+ goto out_unlock;
+
+ for (i = 0; i < DEVID_HASH_SIZE; i++) {
+ list_for_each_entry(old, &nfsd_devid_hash[i], hash) {
+ if (old->fsid_type != fh->fh_fsid_type)
+ continue;
+ if (memcmp(old->fsid, fh->fh_fsid,
+ key_len(old->fsid_type)))
+ continue;
+
+ fhp->fh_export->ex_devid_map = old;
+ goto out_unlock;
+ }
+ }
+
+ map->idx = nfsd_devid_seq++;
+ list_add_tail_rcu(&map->hash, &nfsd_devid_hash[devid_hashfn(map->idx)]);
+ fhp->fh_export->ex_devid_map = map;
+ map = NULL;
+
+out_unlock:
+ spin_unlock(&nfsd_devid_lock);
+ kfree(map);
+}
+
+struct nfsd4_deviceid_map *
+nfsd4_find_devid_map(int idx)
+{
+ struct nfsd4_deviceid_map *map, *ret = NULL;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(map, &nfsd_devid_hash[devid_hashfn(idx)], hash)
+ if (map->idx == idx)
+ ret = map;
+ rcu_read_unlock();
+
+ return ret;
+}
+
+int
+nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp,
+ u32 device_generation)
+{
+ if (!fhp->fh_export->ex_devid_map) {
+ nfsd4_alloc_devid_map(fhp);
+ if (!fhp->fh_export->ex_devid_map)
+ return -ENOMEM;
+ }
+
+ id->fsid_idx = fhp->fh_export->ex_devid_map->idx;
+ id->generation = device_generation;
+ id->pad = 0;
+ return 0;
+}
+
+void nfsd4_setup_layout_type(struct svc_export *exp)
+{
+ struct super_block *sb = exp->ex_path.mnt->mnt_sb;
+
+ if (!(exp->ex_flags & NFSEXP_PNFS))
+ return;
+
+ if (sb->s_export_op->get_uuid &&
+ sb->s_export_op->map_blocks &&
+ sb->s_export_op->commit_blocks)
+ exp->ex_layout_type = LAYOUT_BLOCK_VOLUME;
+}
+
+static void
+nfsd4_free_layout_stateid(struct nfs4_stid *stid)
+{
+ struct nfs4_layout_stateid *ls = layoutstateid(stid);
+ struct nfs4_client *clp = ls->ls_stid.sc_client;
+ struct nfs4_file *fp = ls->ls_stid.sc_file;
+
+ trace_layoutstate_free(&ls->ls_stid.sc_stateid);
+
+ spin_lock(&clp->cl_lock);
+ list_del_init(&ls->ls_perclnt);
+ spin_unlock(&clp->cl_lock);
+
+ spin_lock(&fp->fi_lock);
+ list_del_init(&ls->ls_perfile);
+ spin_unlock(&fp->fi_lock);
+
+ vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls);
+ fput(ls->ls_file);
+
+ if (ls->ls_recalled)
+ atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
+
+ kmem_cache_free(nfs4_layout_stateid_cache, ls);
+}
+
+static int
+nfsd4_layout_setlease(struct nfs4_layout_stateid *ls)
+{
+ struct file_lock *fl;
+ int status;
+
+ fl = locks_alloc_lock();
+ if (!fl)
+ return -ENOMEM;
+ locks_init_lock(fl);
+ fl->fl_lmops = &nfsd4_layouts_lm_ops;
+ fl->fl_flags = FL_LAYOUT;
+ fl->fl_type = F_RDLCK;
+ fl->fl_end = OFFSET_MAX;
+ fl->fl_owner = ls;
+ fl->fl_pid = current->tgid;
+ fl->fl_file = ls->ls_file;
+
+ status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL);
+ if (status) {
+ locks_free_lock(fl);
+ return status;
+ }
+ BUG_ON(fl != NULL);
+ return 0;
+}
+
+static struct nfs4_layout_stateid *
+nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
+ struct nfs4_stid *parent, u32 layout_type)
+{
+ struct nfs4_client *clp = cstate->clp;
+ struct nfs4_file *fp = parent->sc_file;
+ struct nfs4_layout_stateid *ls;
+ struct nfs4_stid *stp;
+
+ stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache);
+ if (!stp)
+ return NULL;
+ stp->sc_free = nfsd4_free_layout_stateid;
+ get_nfs4_file(fp);
+ stp->sc_file = fp;
+
+ ls = layoutstateid(stp);
+ INIT_LIST_HEAD(&ls->ls_perclnt);
+ INIT_LIST_HEAD(&ls->ls_perfile);
+ spin_lock_init(&ls->ls_lock);
+ INIT_LIST_HEAD(&ls->ls_layouts);
+ ls->ls_layout_type = layout_type;
+ nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
+ NFSPROC4_CLNT_CB_LAYOUT);
+
+ if (parent->sc_type == NFS4_DELEG_STID)
+ ls->ls_file = get_file(fp->fi_deleg_file);
+ else
+ ls->ls_file = find_any_file(fp);
+ BUG_ON(!ls->ls_file);
+
+ if (nfsd4_layout_setlease(ls)) {
+ put_nfs4_file(fp);
+ kmem_cache_free(nfs4_layout_stateid_cache, ls);
+ return NULL;
+ }
+
+ spin_lock(&clp->cl_lock);
+ stp->sc_type = NFS4_LAYOUT_STID;
+ list_add(&ls->ls_perclnt, &clp->cl_lo_states);
+ spin_unlock(&clp->cl_lock);
+
+ spin_lock(&fp->fi_lock);
+ list_add(&ls->ls_perfile, &fp->fi_lo_states);
+ spin_unlock(&fp->fi_lock);
+
+ trace_layoutstate_alloc(&ls->ls_stid.sc_stateid);
+ return ls;
+}
+
+__be32
+nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate, stateid_t *stateid,
+ bool create, u32 layout_type, struct nfs4_layout_stateid **lsp)
+{
+ struct nfs4_layout_stateid *ls;
+ struct nfs4_stid *stid;
+ unsigned char typemask = NFS4_LAYOUT_STID;
+ __be32 status;
+
+ if (create)
+ typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);
+
+ status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,
+ net_generic(SVC_NET(rqstp), nfsd_net_id));
+ if (status)
+ goto out;
+
+ if (!fh_match(&cstate->current_fh.fh_handle,
+ &stid->sc_file->fi_fhandle)) {
+ status = nfserr_bad_stateid;
+ goto out_put_stid;
+ }
+
+ if (stid->sc_type != NFS4_LAYOUT_STID) {
+ ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);
+ nfs4_put_stid(stid);
+
+ status = nfserr_jukebox;
+ if (!ls)
+ goto out;
+ } else {
+ ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
+
+ status = nfserr_bad_stateid;
+ if (stateid->si_generation > stid->sc_stateid.si_generation)
+ goto out_put_stid;
+ if (layout_type != ls->ls_layout_type)
+ goto out_put_stid;
+ }
+
+ *lsp = ls;
+ return 0;
+
+out_put_stid:
+ nfs4_put_stid(stid);
+out:
+ return status;
+}
+
+static void
+nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
+{
+ spin_lock(&ls->ls_lock);
+ if (ls->ls_recalled)
+ goto out_unlock;
+
+ ls->ls_recalled = true;
+ atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
+ if (list_empty(&ls->ls_layouts))
+ goto out_unlock;
+
+ trace_layout_recall(&ls->ls_stid.sc_stateid);
+
+ atomic_inc(&ls->ls_stid.sc_count);
+ update_stateid(&ls->ls_stid.sc_stateid);
+ memcpy(&ls->ls_recall_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));
+ nfsd4_run_cb(&ls->ls_recall);
+
+out_unlock:
+ spin_unlock(&ls->ls_lock);
+}
+
+static inline u64
+layout_end(struct nfsd4_layout_seg *seg)
+{
+ u64 end = seg->offset + seg->length;
+ return end >= seg->offset ? end : NFS4_MAX_UINT64;
+}
+
+static void
+layout_update_len(struct nfsd4_layout_seg *lo, u64 end)
+{
+ if (end == NFS4_MAX_UINT64)
+ lo->length = NFS4_MAX_UINT64;
+ else
+ lo->length = end - lo->offset;
+}
+
+static bool
+layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s)
+{
+ if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode)
+ return false;
+ if (layout_end(&lo->lo_seg) <= s->offset)
+ return false;
+ if (layout_end(s) <= lo->lo_seg.offset)
+ return false;
+ return true;
+}
+
+static bool
+layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new)
+{
+ if (lo->iomode != new->iomode)
+ return false;
+ if (layout_end(new) < lo->offset)
+ return false;
+ if (layout_end(lo) < new->offset)
+ return false;
+
+ lo->offset = min(lo->offset, new->offset);
+ layout_update_len(lo, max(layout_end(lo), layout_end(new)));
+ return true;
+}
+
+static __be32
+nfsd4_recall_conflict(struct nfs4_layout_stateid *ls)
+{
+ struct nfs4_file *fp = ls->ls_stid.sc_file;
+ struct nfs4_layout_stateid *l, *n;
+ __be32 nfserr = nfs_ok;
+
+ assert_spin_locked(&fp->fi_lock);
+
+ list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) {
+ if (l != ls) {
+ nfsd4_recall_file_layout(l);
+ nfserr = nfserr_recallconflict;
+ }
+ }
+
+ return nfserr;
+}
+
+__be32
+nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
+{
+ struct nfsd4_layout_seg *seg = &lgp->lg_seg;
+ struct nfs4_file *fp = ls->ls_stid.sc_file;
+ struct nfs4_layout *lp, *new = NULL;
+ __be32 nfserr;
+
+ spin_lock(&fp->fi_lock);
+ nfserr = nfsd4_recall_conflict(ls);
+ if (nfserr)
+ goto out;
+ spin_lock(&ls->ls_lock);
+ list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
+ if (layouts_try_merge(&lp->lo_seg, seg))
+ goto done;
+ }
+ spin_unlock(&ls->ls_lock);
+ spin_unlock(&fp->fi_lock);
+
+ new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL);
+ if (!new)
+ return nfserr_jukebox;
+ memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg));
+ new->lo_state = ls;
+
+ spin_lock(&fp->fi_lock);
+ nfserr = nfsd4_recall_conflict(ls);
+ if (nfserr)
+ goto out;
+ spin_lock(&ls->ls_lock);
+ list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
+ if (layouts_try_merge(&lp->lo_seg, seg))
+ goto done;
+ }
+
+ atomic_inc(&ls->ls_stid.sc_count);
+ list_add_tail(&new->lo_perstate, &ls->ls_layouts);
+ new = NULL;
+done:
+ update_stateid(&ls->ls_stid.sc_stateid);
+ memcpy(&lgp->lg_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));
+ spin_unlock(&ls->ls_lock);
+out:
+ spin_unlock(&fp->fi_lock);
+ if (new)
+ kmem_cache_free(nfs4_layout_cache, new);
+ return nfserr;
+}
+
+static void
+nfsd4_free_layouts(struct list_head *reaplist)
+{
+ while (!list_empty(reaplist)) {
+ struct nfs4_layout *lp = list_first_entry(reaplist,
+ struct nfs4_layout, lo_perstate);
+
+ list_del(&lp->lo_perstate);
+ nfs4_put_stid(&lp->lo_state->ls_stid);
+ kmem_cache_free(nfs4_layout_cache, lp);
+ }
+}
+
+static void
+nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg,
+ struct list_head *reaplist)
+{
+ struct nfsd4_layout_seg *lo = &lp->lo_seg;
+ u64 end = layout_end(lo);
+
+ if (seg->offset <= lo->offset) {
+ if (layout_end(seg) >= end) {
+ list_move_tail(&lp->lo_perstate, reaplist);
+ return;
+ }
+ lo->offset = layout_end(seg);
+ } else {
+ /* retain the whole layout segment on a split. */
+ if (layout_end(seg) < end) {
+ dprintk("%s: split not supported\n", __func__);
+ return;
+ }
+ end = seg->offset;
+ }
+
+ layout_update_len(lo, end);
+}
+
+__be32
+nfsd4_return_file_layouts(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_layoutreturn *lrp)
+{
+ struct nfs4_layout_stateid *ls;
+ struct nfs4_layout *lp, *n;
+ LIST_HEAD(reaplist);
+ __be32 nfserr;
+ int found = 0;
+
+ nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid,
+ false, lrp->lr_layout_type,
+ &ls);
+ if (nfserr) {
+ trace_layout_return_lookup_fail(&lrp->lr_sid);
+ return nfserr;
+ }
+
+ spin_lock(&ls->ls_lock);
+ list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) {
+ if (layouts_overlapping(lp, &lrp->lr_seg)) {
+ nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist);
+ found++;
+ }
+ }
+ if (!list_empty(&ls->ls_layouts)) {
+ if (found) {
+ update_stateid(&ls->ls_stid.sc_stateid);
+ memcpy(&lrp->lr_sid, &ls->ls_stid.sc_stateid,
+ sizeof(stateid_t));
+ }
+ lrp->lrs_present = 1;
+ } else {
+ trace_layoutstate_unhash(&ls->ls_stid.sc_stateid);
+ nfs4_unhash_stid(&ls->ls_stid);
+ lrp->lrs_present = 0;
+ }
+ spin_unlock(&ls->ls_lock);
+
+ nfs4_put_stid(&ls->ls_stid);
+ nfsd4_free_layouts(&reaplist);
+ return nfs_ok;
+}
+
+__be32
+nfsd4_return_client_layouts(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_layoutreturn *lrp)
+{
+ struct nfs4_layout_stateid *ls, *n;
+ struct nfs4_client *clp = cstate->clp;
+ struct nfs4_layout *lp, *t;
+ LIST_HEAD(reaplist);
+
+ lrp->lrs_present = 0;
+
+ spin_lock(&clp->cl_lock);
+ list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) {
+ if (ls->ls_layout_type != lrp->lr_layout_type)
+ continue;
+
+ if (lrp->lr_return_type == RETURN_FSID &&
+ !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle,
+ &cstate->current_fh.fh_handle))
+ continue;
+
+ spin_lock(&ls->ls_lock);
+ list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) {
+ if (lrp->lr_seg.iomode == IOMODE_ANY ||
+ lrp->lr_seg.iomode == lp->lo_seg.iomode)
+ list_move_tail(&lp->lo_perstate, &reaplist);
+ }
+ spin_unlock(&ls->ls_lock);
+ }
+ spin_unlock(&clp->cl_lock);
+
+ nfsd4_free_layouts(&reaplist);
+ return 0;
+}
+
+static void
+nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls,
+ struct list_head *reaplist)
+{
+ spin_lock(&ls->ls_lock);
+ list_splice_init(&ls->ls_layouts, reaplist);
+ spin_unlock(&ls->ls_lock);
+}
+
+void
+nfsd4_return_all_client_layouts(struct nfs4_client *clp)
+{
+ struct nfs4_layout_stateid *ls, *n;
+ LIST_HEAD(reaplist);
+
+ spin_lock(&clp->cl_lock);
+ list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt)
+ nfsd4_return_all_layouts(ls, &reaplist);
+ spin_unlock(&clp->cl_lock);
+
+ nfsd4_free_layouts(&reaplist);
+}
+
+void
+nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)
+{
+ struct nfs4_layout_stateid *ls, *n;
+ LIST_HEAD(reaplist);
+
+ spin_lock(&fp->fi_lock);
+ list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) {
+ if (ls->ls_stid.sc_client == clp)
+ nfsd4_return_all_layouts(ls, &reaplist);
+ }
+ spin_unlock(&fp->fi_lock);
+
+ nfsd4_free_layouts(&reaplist);
+}
+
+static void
+nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
+{
+ struct nfs4_client *clp = ls->ls_stid.sc_client;
+ char addr_str[INET6_ADDRSTRLEN];
+ static char *envp[] = {
+ "HOME=/",
+ "TERM=linux",
+ "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
+ NULL
+ };
+ char *argv[8];
+ int error;
+
+ rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str));
+
+ trace_layout_recall_fail(&ls->ls_stid.sc_stateid);
+
+ printk(KERN_WARNING
+ "nfsd: client %s failed to respond to layout recall. "
+ " Fencing..\n", addr_str);
+
+ argv[0] = "/sbin/nfsd-recall-failed";
+ argv[1] = addr_str;
+ argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id;
+ argv[3] = NULL;
+
+ error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
+ if (error) {
+ printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
+ addr_str, error);
+ }
+}
+
+static int
+nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
+{
+ struct nfs4_layout_stateid *ls =
+ container_of(cb, struct nfs4_layout_stateid, ls_recall);
+ LIST_HEAD(reaplist);
+
+ switch (task->tk_status) {
+ case 0:
+ return 1;
+ case -NFS4ERR_NOMATCHING_LAYOUT:
+ trace_layout_recall_done(&ls->ls_stid.sc_stateid);
+ task->tk_status = 0;
+ return 1;
+ case -NFS4ERR_DELAY:
+ /* Poll the client until it's done with the layout */
+ /* FIXME: cap number of retries.
+ * The pnfs standard states that we need to only expire
+ * the client after at-least "lease time" .eg lease-time * 2
+ * when failing to communicate a recall
+ */
+ rpc_delay(task, HZ/100); /* 10 mili-seconds */
+ return 0;
+ default:
+ /*
+ * Unknown error or non-responding client, we'll need to fence.
+ */
+ nfsd4_cb_layout_fail(ls);
+ return -1;
+ }
+}
+
+static void
+nfsd4_cb_layout_release(struct nfsd4_callback *cb)
+{
+ struct nfs4_layout_stateid *ls =
+ container_of(cb, struct nfs4_layout_stateid, ls_recall);
+ LIST_HEAD(reaplist);
+
+ trace_layout_recall_release(&ls->ls_stid.sc_stateid);
+
+ nfsd4_return_all_layouts(ls, &reaplist);
+ nfsd4_free_layouts(&reaplist);
+ nfs4_put_stid(&ls->ls_stid);
+}
+
+static struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
+ .done = nfsd4_cb_layout_done,
+ .release = nfsd4_cb_layout_release,
+};
+
+static bool
+nfsd4_layout_lm_break(struct file_lock *fl)
+{
+ /*
+ * We don't want the locks code to timeout the lease for us;
+ * we'll remove it ourself if a layout isn't returned
+ * in time:
+ */
+ fl->fl_break_time = 0;
+ nfsd4_recall_file_layout(fl->fl_owner);
+ return false;
+}
+
+static int
+nfsd4_layout_lm_change(struct file_lock *onlist, int arg,
+ struct list_head *dispose)
+{
+ BUG_ON(!(arg & F_UNLCK));
+ return lease_modify(onlist, arg, dispose);
+}
+
+static const struct lock_manager_operations nfsd4_layouts_lm_ops = {
+ .lm_break = nfsd4_layout_lm_break,
+ .lm_change = nfsd4_layout_lm_change,
+};
+
+int
+nfsd4_init_pnfs(void)
+{
+ int i;
+
+ for (i = 0; i < DEVID_HASH_SIZE; i++)
+ INIT_LIST_HEAD(&nfsd_devid_hash[i]);
+
+ nfs4_layout_cache = kmem_cache_create("nfs4_layout",
+ sizeof(struct nfs4_layout), 0, 0, NULL);
+ if (!nfs4_layout_cache)
+ return -ENOMEM;
+
+ nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",
+ sizeof(struct nfs4_layout_stateid), 0, 0, NULL);
+ if (!nfs4_layout_stateid_cache) {
+ kmem_cache_destroy(nfs4_layout_cache);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+void
+nfsd4_exit_pnfs(void)
+{
+ int i;
+
+ kmem_cache_destroy(nfs4_layout_cache);
+ kmem_cache_destroy(nfs4_layout_stateid_cache);
+
+ for (i = 0; i < DEVID_HASH_SIZE; i++) {
+ struct nfsd4_deviceid_map *map, *n;
+
+ list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash)
+ kfree(map);
+ }
+}
Code Review / kvmfornfv.git / blobdiff