forked from Minki/linux
1c73b9d24f
Instead of having the convention where individual nfsd4_callback_ops->done operations return -1 to indicate the callback path is down, move the check to nfsd4_cb_done. Only mark the callback path down on transport-level errors, not NFS-level errors. The existing logic causes the server to set SEQ4_STATUS_CB_PATH_DOWN just because the client returned an error to a CB_RECALL for a delegation that the client had already done a FREE_STATEID for. But clearly that error doesn't mean that there's anything wrong with the backchannel. Additionally, handle NFS4ERR_DELAY in nfsd4_cb_recall_done. The client returns NFS4ERR_DELAY if it is already in the process of returning the delegation. Signed-off-by: Scott Mayhew <smayhew@redhat.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
787 lines
19 KiB
C
787 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2014 Christoph Hellwig.
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*/
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#include <linux/blkdev.h>
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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 const 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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#ifdef CONFIG_NFSD_FLEXFILELAYOUT
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[LAYOUT_FLEX_FILES] = &ff_layout_ops,
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#endif
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#ifdef CONFIG_NFSD_BLOCKLAYOUT
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[LAYOUT_BLOCK_VOLUME] = &bl_layout_ops,
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#endif
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#ifdef CONFIG_NFSD_SCSILAYOUT
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[LAYOUT_SCSI] = &scsi_layout_ops,
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#endif
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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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#if defined(CONFIG_NFSD_BLOCKLAYOUT) || defined(CONFIG_NFSD_SCSILAYOUT)
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struct super_block *sb = exp->ex_path.mnt->mnt_sb;
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#endif
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if (!(exp->ex_flags & NFSEXP_PNFS))
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return;
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#ifdef CONFIG_NFSD_FLEXFILELAYOUT
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exp->ex_layout_types |= 1 << LAYOUT_FLEX_FILES;
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#endif
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#ifdef CONFIG_NFSD_BLOCKLAYOUT
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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_types |= 1 << LAYOUT_BLOCK_VOLUME;
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#endif
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#ifdef CONFIG_NFSD_SCSILAYOUT
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if (sb->s_export_op->map_blocks &&
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sb->s_export_op->commit_blocks &&
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sb->s_bdev && sb->s_bdev->bd_disk->fops->pr_ops &&
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blk_queue_scsi_passthrough(sb->s_bdev->bd_disk->queue))
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exp->ex_layout_types |= 1 << LAYOUT_SCSI;
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#endif
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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_nfsd_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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if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
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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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if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
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return 0;
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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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nfsd4_free_layout_stateid);
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if (!stp)
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return NULL;
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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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mutex_init(&ls->ls_mutex);
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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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fput(ls->ls_file);
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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_nfsd_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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mutex_lock(&ls->ls_mutex);
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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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mutex_lock(&ls->ls_mutex);
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if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid))
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goto out_unlock_stid;
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if (layout_type != ls->ls_layout_type)
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goto out_unlock_stid;
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}
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*lsp = ls;
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return 0;
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out_unlock_stid:
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mutex_unlock(&ls->ls_mutex);
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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_nfsd_layout_recall(&ls->ls_stid.sc_stateid);
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refcount_inc(&ls->ls_stid.sc_count);
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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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|
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return nfserr;
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}
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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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}
|
|
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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|
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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;
|
|
}
|
|
|
|
refcount_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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nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid);
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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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|
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static void
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|
nfsd4_free_layouts(struct list_head *reaplist)
|
|
{
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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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|
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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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|
|
|
static void
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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_nfsd_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)
|
|
nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid);
|
|
lrp->lrs_present = 1;
|
|
} else {
|
|
trace_nfsd_layoutstate_unhash(&ls->ls_stid.sc_stateid);
|
|
nfs4_unhash_stid(&ls->ls_stid);
|
|
lrp->lrs_present = 0;
|
|
}
|
|
spin_unlock(&ls->ls_lock);
|
|
|
|
mutex_unlock(&ls->ls_mutex);
|
|
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 const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed";
|
|
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));
|
|
|
|
printk(KERN_WARNING
|
|
"nfsd: client %s failed to respond to layout recall. "
|
|
" Fencing..\n", addr_str);
|
|
|
|
argv[0] = (char *)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(nfsd_recall_failed, argv, envp,
|
|
UMH_WAIT_PROC);
|
|
if (error) {
|
|
printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
|
|
addr_str, error);
|
|
}
|
|
}
|
|
|
|
static void
|
|
nfsd4_cb_layout_prepare(struct nfsd4_callback *cb)
|
|
{
|
|
struct nfs4_layout_stateid *ls =
|
|
container_of(cb, struct nfs4_layout_stateid, ls_recall);
|
|
|
|
mutex_lock(&ls->ls_mutex);
|
|
nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid);
|
|
mutex_unlock(&ls->ls_mutex);
|
|
}
|
|
|
|
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);
|
|
struct nfsd_net *nn;
|
|
ktime_t now, cutoff;
|
|
const struct nfsd4_layout_ops *ops;
|
|
|
|
|
|
switch (task->tk_status) {
|
|
case 0:
|
|
case -NFS4ERR_DELAY:
|
|
/*
|
|
* Anything left? If not, then call it done. Note that we don't
|
|
* take the spinlock since this is an optimization and nothing
|
|
* should get added until the cb counter goes to zero.
|
|
*/
|
|
if (list_empty(&ls->ls_layouts))
|
|
return 1;
|
|
|
|
/* Poll the client until it's done with the layout */
|
|
now = ktime_get();
|
|
nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id);
|
|
|
|
/* Client gets 2 lease periods to return it */
|
|
cutoff = ktime_add_ns(task->tk_start,
|
|
nn->nfsd4_lease * NSEC_PER_SEC * 2);
|
|
|
|
if (ktime_before(now, cutoff)) {
|
|
rpc_delay(task, HZ/100); /* 10 mili-seconds */
|
|
return 0;
|
|
}
|
|
/* Fallthrough */
|
|
default:
|
|
/*
|
|
* Unknown error or non-responding client, we'll need to fence.
|
|
*/
|
|
trace_nfsd_layout_recall_fail(&ls->ls_stid.sc_stateid);
|
|
|
|
ops = nfsd4_layout_ops[ls->ls_layout_type];
|
|
if (ops->fence_client)
|
|
ops->fence_client(ls);
|
|
else
|
|
nfsd4_cb_layout_fail(ls);
|
|
return 1;
|
|
case -NFS4ERR_NOMATCHING_LAYOUT:
|
|
trace_nfsd_layout_recall_done(&ls->ls_stid.sc_stateid);
|
|
task->tk_status = 0;
|
|
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_nfsd_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 const struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
|
|
.prepare = nfsd4_cb_layout_prepare,
|
|
.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);
|
|
}
|
|
}
|