![Christoph Hellwig](/assets/img/avatar_default.png)
Add a small shim between core nfsd and filesystems to translate the somewhat cumbersome pNFS data structures and semantics to something more palatable for Linux filesystems. Thanks to Rick McNeal for the old prototype pNFS blocklayout server code, which gave a lot of inspiration to this version even if no code is left from it. Signed-off-by: Christoph Hellwig <hch@lst.de>
722 lines
17 KiB
C
722 lines
17 KiB
C
/*
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* Copyright (c) 2014 Christoph Hellwig.
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*/
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#include <linux/kmod.h>
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#include <linux/file.h>
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#include <linux/jhash.h>
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#include <linux/sched.h>
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#include <linux/sunrpc/addr.h>
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#include "pnfs.h"
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#include "netns.h"
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#include "trace.h"
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#define NFSDDBG_FACILITY NFSDDBG_PNFS
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struct nfs4_layout {
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struct list_head lo_perstate;
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struct nfs4_layout_stateid *lo_state;
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struct nfsd4_layout_seg lo_seg;
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};
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static struct kmem_cache *nfs4_layout_cache;
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static struct kmem_cache *nfs4_layout_stateid_cache;
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static struct nfsd4_callback_ops nfsd4_cb_layout_ops;
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static const struct lock_manager_operations nfsd4_layouts_lm_ops;
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const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = {
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[LAYOUT_BLOCK_VOLUME] = &bl_layout_ops,
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};
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/* pNFS device ID to export fsid mapping */
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#define DEVID_HASH_BITS 8
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#define DEVID_HASH_SIZE (1 << DEVID_HASH_BITS)
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#define DEVID_HASH_MASK (DEVID_HASH_SIZE - 1)
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static u64 nfsd_devid_seq = 1;
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static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE];
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static DEFINE_SPINLOCK(nfsd_devid_lock);
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static inline u32 devid_hashfn(u64 idx)
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{
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return jhash_2words(idx, idx >> 32, 0) & DEVID_HASH_MASK;
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}
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static void
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nfsd4_alloc_devid_map(const struct svc_fh *fhp)
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{
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const struct knfsd_fh *fh = &fhp->fh_handle;
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size_t fsid_len = key_len(fh->fh_fsid_type);
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struct nfsd4_deviceid_map *map, *old;
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int i;
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map = kzalloc(sizeof(*map) + fsid_len, GFP_KERNEL);
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if (!map)
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return;
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map->fsid_type = fh->fh_fsid_type;
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memcpy(&map->fsid, fh->fh_fsid, fsid_len);
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spin_lock(&nfsd_devid_lock);
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if (fhp->fh_export->ex_devid_map)
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goto out_unlock;
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for (i = 0; i < DEVID_HASH_SIZE; i++) {
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list_for_each_entry(old, &nfsd_devid_hash[i], hash) {
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if (old->fsid_type != fh->fh_fsid_type)
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continue;
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if (memcmp(old->fsid, fh->fh_fsid,
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key_len(old->fsid_type)))
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continue;
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fhp->fh_export->ex_devid_map = old;
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goto out_unlock;
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}
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}
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map->idx = nfsd_devid_seq++;
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list_add_tail_rcu(&map->hash, &nfsd_devid_hash[devid_hashfn(map->idx)]);
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fhp->fh_export->ex_devid_map = map;
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map = NULL;
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out_unlock:
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spin_unlock(&nfsd_devid_lock);
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kfree(map);
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}
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struct nfsd4_deviceid_map *
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nfsd4_find_devid_map(int idx)
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{
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struct nfsd4_deviceid_map *map, *ret = NULL;
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rcu_read_lock();
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list_for_each_entry_rcu(map, &nfsd_devid_hash[devid_hashfn(idx)], hash)
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if (map->idx == idx)
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ret = map;
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rcu_read_unlock();
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return ret;
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}
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int
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nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp,
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u32 device_generation)
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{
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if (!fhp->fh_export->ex_devid_map) {
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nfsd4_alloc_devid_map(fhp);
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if (!fhp->fh_export->ex_devid_map)
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return -ENOMEM;
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}
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id->fsid_idx = fhp->fh_export->ex_devid_map->idx;
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id->generation = device_generation;
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id->pad = 0;
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return 0;
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}
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void nfsd4_setup_layout_type(struct svc_export *exp)
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{
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struct super_block *sb = exp->ex_path.mnt->mnt_sb;
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if (exp->ex_flags & NFSEXP_NOPNFS)
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return;
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if (sb->s_export_op->get_uuid &&
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sb->s_export_op->map_blocks &&
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sb->s_export_op->commit_blocks)
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exp->ex_layout_type = LAYOUT_BLOCK_VOLUME;
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}
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static void
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nfsd4_free_layout_stateid(struct nfs4_stid *stid)
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{
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struct nfs4_layout_stateid *ls = layoutstateid(stid);
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struct nfs4_client *clp = ls->ls_stid.sc_client;
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struct nfs4_file *fp = ls->ls_stid.sc_file;
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trace_layoutstate_free(&ls->ls_stid.sc_stateid);
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spin_lock(&clp->cl_lock);
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list_del_init(&ls->ls_perclnt);
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spin_unlock(&clp->cl_lock);
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spin_lock(&fp->fi_lock);
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list_del_init(&ls->ls_perfile);
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spin_unlock(&fp->fi_lock);
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vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls);
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fput(ls->ls_file);
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if (ls->ls_recalled)
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atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
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kmem_cache_free(nfs4_layout_stateid_cache, ls);
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}
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static int
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nfsd4_layout_setlease(struct nfs4_layout_stateid *ls)
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{
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struct file_lock *fl;
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int status;
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fl = locks_alloc_lock();
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if (!fl)
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return -ENOMEM;
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locks_init_lock(fl);
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fl->fl_lmops = &nfsd4_layouts_lm_ops;
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fl->fl_flags = FL_LAYOUT;
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fl->fl_type = F_RDLCK;
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fl->fl_end = OFFSET_MAX;
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fl->fl_owner = ls;
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fl->fl_pid = current->tgid;
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fl->fl_file = ls->ls_file;
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status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL);
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if (status) {
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locks_free_lock(fl);
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return status;
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}
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BUG_ON(fl != NULL);
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return 0;
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}
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static struct nfs4_layout_stateid *
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nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
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struct nfs4_stid *parent, u32 layout_type)
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{
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struct nfs4_client *clp = cstate->clp;
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struct nfs4_file *fp = parent->sc_file;
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struct nfs4_layout_stateid *ls;
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struct nfs4_stid *stp;
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stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache);
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if (!stp)
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return NULL;
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stp->sc_free = nfsd4_free_layout_stateid;
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get_nfs4_file(fp);
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stp->sc_file = fp;
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ls = layoutstateid(stp);
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INIT_LIST_HEAD(&ls->ls_perclnt);
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INIT_LIST_HEAD(&ls->ls_perfile);
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spin_lock_init(&ls->ls_lock);
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INIT_LIST_HEAD(&ls->ls_layouts);
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ls->ls_layout_type = layout_type;
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nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
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NFSPROC4_CLNT_CB_LAYOUT);
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if (parent->sc_type == NFS4_DELEG_STID)
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ls->ls_file = get_file(fp->fi_deleg_file);
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else
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ls->ls_file = find_any_file(fp);
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BUG_ON(!ls->ls_file);
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if (nfsd4_layout_setlease(ls)) {
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put_nfs4_file(fp);
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kmem_cache_free(nfs4_layout_stateid_cache, ls);
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return NULL;
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}
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spin_lock(&clp->cl_lock);
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stp->sc_type = NFS4_LAYOUT_STID;
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list_add(&ls->ls_perclnt, &clp->cl_lo_states);
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spin_unlock(&clp->cl_lock);
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spin_lock(&fp->fi_lock);
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list_add(&ls->ls_perfile, &fp->fi_lo_states);
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spin_unlock(&fp->fi_lock);
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trace_layoutstate_alloc(&ls->ls_stid.sc_stateid);
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return ls;
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}
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__be32
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nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
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struct nfsd4_compound_state *cstate, stateid_t *stateid,
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bool create, u32 layout_type, struct nfs4_layout_stateid **lsp)
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{
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struct nfs4_layout_stateid *ls;
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struct nfs4_stid *stid;
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unsigned char typemask = NFS4_LAYOUT_STID;
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__be32 status;
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if (create)
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typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);
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status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,
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net_generic(SVC_NET(rqstp), nfsd_net_id));
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if (status)
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goto out;
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if (!fh_match(&cstate->current_fh.fh_handle,
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&stid->sc_file->fi_fhandle)) {
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status = nfserr_bad_stateid;
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goto out_put_stid;
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}
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if (stid->sc_type != NFS4_LAYOUT_STID) {
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ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);
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nfs4_put_stid(stid);
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status = nfserr_jukebox;
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if (!ls)
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goto out;
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} else {
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ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
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status = nfserr_bad_stateid;
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if (stateid->si_generation > stid->sc_stateid.si_generation)
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goto out_put_stid;
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if (layout_type != ls->ls_layout_type)
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goto out_put_stid;
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}
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*lsp = ls;
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return 0;
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out_put_stid:
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nfs4_put_stid(stid);
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out:
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return status;
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}
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static void
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nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
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{
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spin_lock(&ls->ls_lock);
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if (ls->ls_recalled)
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goto out_unlock;
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ls->ls_recalled = true;
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atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
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if (list_empty(&ls->ls_layouts))
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goto out_unlock;
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trace_layout_recall(&ls->ls_stid.sc_stateid);
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atomic_inc(&ls->ls_stid.sc_count);
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update_stateid(&ls->ls_stid.sc_stateid);
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memcpy(&ls->ls_recall_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));
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nfsd4_run_cb(&ls->ls_recall);
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out_unlock:
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spin_unlock(&ls->ls_lock);
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}
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static inline u64
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layout_end(struct nfsd4_layout_seg *seg)
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{
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u64 end = seg->offset + seg->length;
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return end >= seg->offset ? end : NFS4_MAX_UINT64;
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}
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static void
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layout_update_len(struct nfsd4_layout_seg *lo, u64 end)
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{
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if (end == NFS4_MAX_UINT64)
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lo->length = NFS4_MAX_UINT64;
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else
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lo->length = end - lo->offset;
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}
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static bool
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layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s)
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{
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if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode)
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return false;
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if (layout_end(&lo->lo_seg) <= s->offset)
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return false;
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if (layout_end(s) <= lo->lo_seg.offset)
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return false;
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return true;
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}
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static bool
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layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new)
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{
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if (lo->iomode != new->iomode)
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return false;
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if (layout_end(new) < lo->offset)
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return false;
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if (layout_end(lo) < new->offset)
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return false;
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lo->offset = min(lo->offset, new->offset);
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layout_update_len(lo, max(layout_end(lo), layout_end(new)));
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return true;
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}
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static __be32
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nfsd4_recall_conflict(struct nfs4_layout_stateid *ls)
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{
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struct nfs4_file *fp = ls->ls_stid.sc_file;
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struct nfs4_layout_stateid *l, *n;
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__be32 nfserr = nfs_ok;
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assert_spin_locked(&fp->fi_lock);
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list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) {
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if (l != ls) {
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nfsd4_recall_file_layout(l);
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nfserr = nfserr_recallconflict;
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}
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}
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return nfserr;
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}
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__be32
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nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
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{
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struct nfsd4_layout_seg *seg = &lgp->lg_seg;
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struct nfs4_file *fp = ls->ls_stid.sc_file;
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struct nfs4_layout *lp, *new = NULL;
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__be32 nfserr;
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spin_lock(&fp->fi_lock);
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nfserr = nfsd4_recall_conflict(ls);
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if (nfserr)
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goto out;
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spin_lock(&ls->ls_lock);
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list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
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if (layouts_try_merge(&lp->lo_seg, seg))
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goto done;
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}
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spin_unlock(&ls->ls_lock);
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spin_unlock(&fp->fi_lock);
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new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL);
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if (!new)
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return nfserr_jukebox;
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memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg));
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new->lo_state = ls;
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spin_lock(&fp->fi_lock);
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nfserr = nfsd4_recall_conflict(ls);
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if (nfserr)
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goto out;
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spin_lock(&ls->ls_lock);
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list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
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if (layouts_try_merge(&lp->lo_seg, seg))
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goto done;
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}
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atomic_inc(&ls->ls_stid.sc_count);
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list_add_tail(&new->lo_perstate, &ls->ls_layouts);
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new = NULL;
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done:
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update_stateid(&ls->ls_stid.sc_stateid);
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memcpy(&lgp->lg_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));
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spin_unlock(&ls->ls_lock);
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out:
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spin_unlock(&fp->fi_lock);
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if (new)
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kmem_cache_free(nfs4_layout_cache, new);
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return nfserr;
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}
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static void
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nfsd4_free_layouts(struct list_head *reaplist)
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{
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while (!list_empty(reaplist)) {
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struct nfs4_layout *lp = list_first_entry(reaplist,
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struct nfs4_layout, lo_perstate);
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list_del(&lp->lo_perstate);
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nfs4_put_stid(&lp->lo_state->ls_stid);
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kmem_cache_free(nfs4_layout_cache, lp);
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}
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}
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static void
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nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg,
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struct list_head *reaplist)
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{
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struct nfsd4_layout_seg *lo = &lp->lo_seg;
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u64 end = layout_end(lo);
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if (seg->offset <= lo->offset) {
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if (layout_end(seg) >= end) {
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list_move_tail(&lp->lo_perstate, reaplist);
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return;
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}
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end = seg->offset;
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} else {
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/* retain the whole layout segment on a split. */
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if (layout_end(seg) < end) {
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dprintk("%s: split not supported\n", __func__);
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return;
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}
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lo->offset = layout_end(seg);
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}
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layout_update_len(lo, end);
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}
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__be32
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nfsd4_return_file_layouts(struct svc_rqst *rqstp,
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struct nfsd4_compound_state *cstate,
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struct nfsd4_layoutreturn *lrp)
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{
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struct nfs4_layout_stateid *ls;
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struct nfs4_layout *lp, *n;
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LIST_HEAD(reaplist);
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__be32 nfserr;
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int found = 0;
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nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid,
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false, lrp->lr_layout_type,
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&ls);
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if (nfserr) {
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trace_layout_return_lookup_fail(&lrp->lr_sid);
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return nfserr;
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}
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spin_lock(&ls->ls_lock);
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list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) {
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if (layouts_overlapping(lp, &lrp->lr_seg)) {
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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 (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));
|
|
|
|
nfsd4_cb_layout_fail(ls);
|
|
|
|
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);
|
|
}
|
|
}
|