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786 lines
19 KiB
786 lines
19 KiB
// 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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|
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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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|
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#define NFSDDBG_FACILITY NFSDDBG_PNFS |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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if (!(exp->ex_flags & NFSEXP_PNFS)) |
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return; |
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|
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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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|
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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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|
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trace_nfsd_layoutstate_free(&ls->ls_stid.sc_stateid); |
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|
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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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|
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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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|
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if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) |
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vfs_setlease(ls->ls_file->nf_file, F_UNLCK, NULL, (void **)&ls); |
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nfsd_file_put(ls->ls_file); |
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|
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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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|
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kmem_cache_free(nfs4_layout_stateid_cache, ls); |
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} |
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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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|
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if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) |
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return 0; |
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|
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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->nf_file; |
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|
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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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|
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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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|
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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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|
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get_nfs4_file(fp); |
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stp->sc_file = fp; |
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|
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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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|
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if (parent->sc_type == NFS4_DELEG_STID) |
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ls->ls_file = nfsd_file_get(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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|
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if (nfsd4_layout_setlease(ls)) { |
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nfsd_file_put(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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|
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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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|
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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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|
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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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|
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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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|
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if (create) |
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typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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trace_nfsd_layout_recall(&ls->ls_stid.sc_stateid); |
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|
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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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|
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out_unlock: |
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spin_unlock(&ls->ls_lock); |
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} |
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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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|
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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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|
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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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|
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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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} |
|
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); |
|
if (nfserr) |
|
goto out; |
|
spin_lock(&ls->ls_lock); |
|
list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { |
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if (layouts_try_merge(&lp->lo_seg, seg)) |
|
goto done; |
|
} |
|
|
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refcount_inc(&ls->ls_stid.sc_count); |
|
list_add_tail(&new->lo_perstate, &ls->ls_layouts); |
|
new = NULL; |
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done: |
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nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid); |
|
spin_unlock(&ls->ls_lock); |
|
out: |
|
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; |
|
} |
|
|
|
static void |
|
nfsd4_free_layouts(struct list_head *reaplist) |
|
{ |
|
while (!list_empty(reaplist)) { |
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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 |
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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->nf_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, |
|
(u64)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); |
|
} |
|
}
|
|
|