4162 lines
109 KiB
C
4162 lines
109 KiB
C
/*
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* linux/fs/nfsd/nfs4state.c
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*
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* Copyright (c) 2001 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Kendrick Smith <kmsmith@umich.edu>
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* Andy Adamson <kandros@umich.edu>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/param.h>
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#include <linux/major.h>
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#include <linux/slab.h>
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#include <linux/sunrpc/svc.h>
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#include <linux/nfsd/nfsd.h>
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#include <linux/nfsd/cache.h>
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#include <linux/file.h>
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#include <linux/mount.h>
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#include <linux/workqueue.h>
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#include <linux/smp_lock.h>
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#include <linux/kthread.h>
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#include <linux/nfs4.h>
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#include <linux/nfsd/state.h>
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#include <linux/nfsd/xdr4.h>
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#include <linux/namei.h>
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#include <linux/swap.h>
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#include <linux/mutex.h>
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#include <linux/lockd/bind.h>
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#include <linux/module.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include <linux/sunrpc/clnt.h>
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#define NFSDDBG_FACILITY NFSDDBG_PROC
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/* Globals */
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static time_t lease_time = 90; /* default lease time */
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static time_t user_lease_time = 90;
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static time_t boot_time;
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static u32 current_ownerid = 1;
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static u32 current_fileid = 1;
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static u32 current_delegid = 1;
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static u32 nfs4_init;
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static stateid_t zerostateid; /* bits all 0 */
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static stateid_t onestateid; /* bits all 1 */
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static u64 current_sessionid = 1;
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#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
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#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
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/* forward declarations */
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static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
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static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
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static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
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static void nfs4_set_recdir(char *recdir);
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/* Locking: */
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/* Currently used for almost all code touching nfsv4 state: */
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static DEFINE_MUTEX(client_mutex);
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/*
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* Currently used for the del_recall_lru and file hash table. In an
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* effort to decrease the scope of the client_mutex, this spinlock may
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* eventually cover more:
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*/
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static DEFINE_SPINLOCK(recall_lock);
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static struct kmem_cache *stateowner_slab = NULL;
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static struct kmem_cache *file_slab = NULL;
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static struct kmem_cache *stateid_slab = NULL;
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static struct kmem_cache *deleg_slab = NULL;
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void
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nfs4_lock_state(void)
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{
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mutex_lock(&client_mutex);
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}
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void
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nfs4_unlock_state(void)
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{
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mutex_unlock(&client_mutex);
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}
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static inline u32
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opaque_hashval(const void *ptr, int nbytes)
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{
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unsigned char *cptr = (unsigned char *) ptr;
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u32 x = 0;
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while (nbytes--) {
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x *= 37;
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x += *cptr++;
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}
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return x;
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}
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static struct list_head del_recall_lru;
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static inline void
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put_nfs4_file(struct nfs4_file *fi)
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{
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if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
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list_del(&fi->fi_hash);
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spin_unlock(&recall_lock);
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iput(fi->fi_inode);
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kmem_cache_free(file_slab, fi);
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}
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}
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static inline void
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get_nfs4_file(struct nfs4_file *fi)
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{
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atomic_inc(&fi->fi_ref);
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}
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static int num_delegations;
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unsigned int max_delegations;
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/*
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* Open owner state (share locks)
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*/
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/* hash tables for nfs4_stateowner */
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#define OWNER_HASH_BITS 8
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#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
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#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
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#define ownerid_hashval(id) \
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((id) & OWNER_HASH_MASK)
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#define ownerstr_hashval(clientid, ownername) \
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(((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
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static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
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static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
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/* hash table for nfs4_file */
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#define FILE_HASH_BITS 8
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#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
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#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
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/* hash table for (open)nfs4_stateid */
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#define STATEID_HASH_BITS 10
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#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
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#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
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#define file_hashval(x) \
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hash_ptr(x, FILE_HASH_BITS)
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#define stateid_hashval(owner_id, file_id) \
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(((owner_id) + (file_id)) & STATEID_HASH_MASK)
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static struct list_head file_hashtbl[FILE_HASH_SIZE];
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static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
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static struct nfs4_delegation *
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alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
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{
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struct nfs4_delegation *dp;
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struct nfs4_file *fp = stp->st_file;
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struct nfs4_cb_conn *cb = &stp->st_stateowner->so_client->cl_cb_conn;
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dprintk("NFSD alloc_init_deleg\n");
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if (fp->fi_had_conflict)
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return NULL;
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if (num_delegations > max_delegations)
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return NULL;
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dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
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if (dp == NULL)
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return dp;
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num_delegations++;
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INIT_LIST_HEAD(&dp->dl_perfile);
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INIT_LIST_HEAD(&dp->dl_perclnt);
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INIT_LIST_HEAD(&dp->dl_recall_lru);
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dp->dl_client = clp;
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get_nfs4_file(fp);
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dp->dl_file = fp;
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dp->dl_flock = NULL;
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get_file(stp->st_vfs_file);
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dp->dl_vfs_file = stp->st_vfs_file;
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dp->dl_type = type;
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dp->dl_ident = cb->cb_ident;
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dp->dl_stateid.si_boot = get_seconds();
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dp->dl_stateid.si_stateownerid = current_delegid++;
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dp->dl_stateid.si_fileid = 0;
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dp->dl_stateid.si_generation = 0;
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fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle);
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dp->dl_time = 0;
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atomic_set(&dp->dl_count, 1);
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list_add(&dp->dl_perfile, &fp->fi_delegations);
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list_add(&dp->dl_perclnt, &clp->cl_delegations);
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return dp;
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}
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void
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nfs4_put_delegation(struct nfs4_delegation *dp)
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{
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if (atomic_dec_and_test(&dp->dl_count)) {
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dprintk("NFSD: freeing dp %p\n",dp);
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put_nfs4_file(dp->dl_file);
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kmem_cache_free(deleg_slab, dp);
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num_delegations--;
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}
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}
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/* Remove the associated file_lock first, then remove the delegation.
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* lease_modify() is called to remove the FS_LEASE file_lock from
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* the i_flock list, eventually calling nfsd's lock_manager
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* fl_release_callback.
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*/
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static void
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nfs4_close_delegation(struct nfs4_delegation *dp)
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{
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struct file *filp = dp->dl_vfs_file;
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dprintk("NFSD: close_delegation dp %p\n",dp);
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dp->dl_vfs_file = NULL;
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/* The following nfsd_close may not actually close the file,
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* but we want to remove the lease in any case. */
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if (dp->dl_flock)
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vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
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nfsd_close(filp);
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}
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/* Called under the state lock. */
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static void
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unhash_delegation(struct nfs4_delegation *dp)
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{
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list_del_init(&dp->dl_perfile);
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list_del_init(&dp->dl_perclnt);
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spin_lock(&recall_lock);
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list_del_init(&dp->dl_recall_lru);
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spin_unlock(&recall_lock);
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nfs4_close_delegation(dp);
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nfs4_put_delegation(dp);
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}
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/*
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* SETCLIENTID state
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*/
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/* Hash tables for nfs4_clientid state */
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#define CLIENT_HASH_BITS 4
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#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
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#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
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#define clientid_hashval(id) \
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((id) & CLIENT_HASH_MASK)
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#define clientstr_hashval(name) \
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(opaque_hashval((name), 8) & CLIENT_HASH_MASK)
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/*
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* reclaim_str_hashtbl[] holds known client info from previous reset/reboot
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* used in reboot/reset lease grace period processing
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*
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* conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
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* setclientid_confirmed info.
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*
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* unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
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* setclientid info.
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*
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* client_lru holds client queue ordered by nfs4_client.cl_time
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* for lease renewal.
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*
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* close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
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* for last close replay.
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*/
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static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
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static int reclaim_str_hashtbl_size = 0;
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static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
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static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
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static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
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static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
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static struct list_head client_lru;
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static struct list_head close_lru;
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static void unhash_generic_stateid(struct nfs4_stateid *stp)
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{
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list_del(&stp->st_hash);
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list_del(&stp->st_perfile);
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list_del(&stp->st_perstateowner);
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}
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static void free_generic_stateid(struct nfs4_stateid *stp)
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{
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put_nfs4_file(stp->st_file);
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kmem_cache_free(stateid_slab, stp);
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}
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static void release_lock_stateid(struct nfs4_stateid *stp)
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{
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unhash_generic_stateid(stp);
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locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
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free_generic_stateid(stp);
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}
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static void unhash_lockowner(struct nfs4_stateowner *sop)
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{
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struct nfs4_stateid *stp;
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list_del(&sop->so_idhash);
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list_del(&sop->so_strhash);
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list_del(&sop->so_perstateid);
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while (!list_empty(&sop->so_stateids)) {
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stp = list_first_entry(&sop->so_stateids,
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struct nfs4_stateid, st_perstateowner);
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release_lock_stateid(stp);
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}
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}
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static void release_lockowner(struct nfs4_stateowner *sop)
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{
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unhash_lockowner(sop);
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nfs4_put_stateowner(sop);
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}
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static void
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release_stateid_lockowners(struct nfs4_stateid *open_stp)
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{
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struct nfs4_stateowner *lock_sop;
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while (!list_empty(&open_stp->st_lockowners)) {
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lock_sop = list_entry(open_stp->st_lockowners.next,
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struct nfs4_stateowner, so_perstateid);
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/* list_del(&open_stp->st_lockowners); */
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BUG_ON(lock_sop->so_is_open_owner);
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release_lockowner(lock_sop);
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}
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}
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static void release_open_stateid(struct nfs4_stateid *stp)
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{
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unhash_generic_stateid(stp);
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release_stateid_lockowners(stp);
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nfsd_close(stp->st_vfs_file);
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free_generic_stateid(stp);
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}
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static void unhash_openowner(struct nfs4_stateowner *sop)
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{
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struct nfs4_stateid *stp;
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list_del(&sop->so_idhash);
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list_del(&sop->so_strhash);
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list_del(&sop->so_perclient);
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list_del(&sop->so_perstateid); /* XXX: necessary? */
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while (!list_empty(&sop->so_stateids)) {
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stp = list_first_entry(&sop->so_stateids,
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struct nfs4_stateid, st_perstateowner);
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release_open_stateid(stp);
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}
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}
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static void release_openowner(struct nfs4_stateowner *sop)
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{
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unhash_openowner(sop);
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list_del(&sop->so_close_lru);
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nfs4_put_stateowner(sop);
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}
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static DEFINE_SPINLOCK(sessionid_lock);
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#define SESSION_HASH_SIZE 512
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static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
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static inline int
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hash_sessionid(struct nfs4_sessionid *sessionid)
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{
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struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
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return sid->sequence % SESSION_HASH_SIZE;
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}
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static inline void
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dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
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{
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u32 *ptr = (u32 *)(&sessionid->data[0]);
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dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
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}
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static void
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gen_sessionid(struct nfsd4_session *ses)
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{
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struct nfs4_client *clp = ses->se_client;
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struct nfsd4_sessionid *sid;
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sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
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sid->clientid = clp->cl_clientid;
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sid->sequence = current_sessionid++;
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sid->reserved = 0;
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}
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/*
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* The protocol defines ca_maxresponssize_cached to include the size of
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* the rpc header, but all we need to cache is the data starting after
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* the end of the initial SEQUENCE operation--the rest we regenerate
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* each time. Therefore we can advertise a ca_maxresponssize_cached
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* value that is the number of bytes in our cache plus a few additional
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* bytes. In order to stay on the safe side, and not promise more than
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* we can cache, those additional bytes must be the minimum possible: 24
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* bytes of rpc header (xid through accept state, with AUTH_NULL
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* verifier), 12 for the compound header (with zero-length tag), and 44
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* for the SEQUENCE op response:
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*/
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#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
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/*
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* Give the client the number of ca_maxresponsesize_cached slots it
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* requests, of size bounded by NFSD_SLOT_CACHE_SIZE,
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* NFSD_MAX_MEM_PER_SESSION, and nfsd_drc_max_mem. Do not allow more
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* than NFSD_MAX_SLOTS_PER_SESSION.
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*
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* If we run out of reserved DRC memory we should (up to a point)
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* re-negotiate active sessions and reduce their slot usage to make
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* rooom for new connections. For now we just fail the create session.
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*/
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static int set_forechannel_drc_size(struct nfsd4_channel_attrs *fchan)
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{
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int mem, size = fchan->maxresp_cached;
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if (fchan->maxreqs < 1)
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return nfserr_inval;
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if (size < NFSD_MIN_HDR_SEQ_SZ)
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size = NFSD_MIN_HDR_SEQ_SZ;
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size -= NFSD_MIN_HDR_SEQ_SZ;
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if (size > NFSD_SLOT_CACHE_SIZE)
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size = NFSD_SLOT_CACHE_SIZE;
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/* bound the maxreqs by NFSD_MAX_MEM_PER_SESSION */
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mem = fchan->maxreqs * size;
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if (mem > NFSD_MAX_MEM_PER_SESSION) {
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fchan->maxreqs = NFSD_MAX_MEM_PER_SESSION / size;
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if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
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fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
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mem = fchan->maxreqs * size;
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}
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spin_lock(&nfsd_drc_lock);
|
|
/* bound the total session drc memory ussage */
|
|
if (mem + nfsd_drc_mem_used > nfsd_drc_max_mem) {
|
|
fchan->maxreqs = (nfsd_drc_max_mem - nfsd_drc_mem_used) / size;
|
|
mem = fchan->maxreqs * size;
|
|
}
|
|
nfsd_drc_mem_used += mem;
|
|
spin_unlock(&nfsd_drc_lock);
|
|
|
|
if (fchan->maxreqs == 0)
|
|
return nfserr_serverfault;
|
|
|
|
fchan->maxresp_cached = size + NFSD_MIN_HDR_SEQ_SZ;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* fchan holds the client values on input, and the server values on output
|
|
*/
|
|
static int init_forechannel_attrs(struct svc_rqst *rqstp,
|
|
struct nfsd4_channel_attrs *session_fchan,
|
|
struct nfsd4_channel_attrs *fchan)
|
|
{
|
|
int status = 0;
|
|
__u32 maxcount = svc_max_payload(rqstp);
|
|
|
|
/* headerpadsz set to zero in encode routine */
|
|
|
|
/* Use the client's max request and max response size if possible */
|
|
if (fchan->maxreq_sz > maxcount)
|
|
fchan->maxreq_sz = maxcount;
|
|
session_fchan->maxreq_sz = fchan->maxreq_sz;
|
|
|
|
if (fchan->maxresp_sz > maxcount)
|
|
fchan->maxresp_sz = maxcount;
|
|
session_fchan->maxresp_sz = fchan->maxresp_sz;
|
|
|
|
/* Use the client's maxops if possible */
|
|
if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND)
|
|
fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND;
|
|
session_fchan->maxops = fchan->maxops;
|
|
|
|
/* FIXME: Error means no more DRC pages so the server should
|
|
* recover pages from existing sessions. For now fail session
|
|
* creation.
|
|
*/
|
|
status = set_forechannel_drc_size(fchan);
|
|
|
|
session_fchan->maxresp_cached = fchan->maxresp_cached;
|
|
session_fchan->maxreqs = fchan->maxreqs;
|
|
|
|
dprintk("%s status %d\n", __func__, status);
|
|
return status;
|
|
}
|
|
|
|
static void
|
|
free_session_slots(struct nfsd4_session *ses)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ses->se_fchannel.maxreqs; i++)
|
|
kfree(ses->se_slots[i]);
|
|
}
|
|
|
|
static int
|
|
alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
|
|
struct nfsd4_create_session *cses)
|
|
{
|
|
struct nfsd4_session *new, tmp;
|
|
struct nfsd4_slot *sp;
|
|
int idx, slotsize, cachesize, i;
|
|
int status;
|
|
|
|
memset(&tmp, 0, sizeof(tmp));
|
|
|
|
/* FIXME: For now, we just accept the client back channel attributes. */
|
|
tmp.se_bchannel = cses->back_channel;
|
|
status = init_forechannel_attrs(rqstp, &tmp.se_fchannel,
|
|
&cses->fore_channel);
|
|
if (status)
|
|
goto out;
|
|
|
|
BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot)
|
|
+ sizeof(struct nfsd4_session) > PAGE_SIZE);
|
|
|
|
status = nfserr_serverfault;
|
|
/* allocate struct nfsd4_session and slot table pointers in one piece */
|
|
slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot *);
|
|
new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL);
|
|
if (!new)
|
|
goto out;
|
|
|
|
memcpy(new, &tmp, sizeof(*new));
|
|
|
|
/* allocate each struct nfsd4_slot and data cache in one piece */
|
|
cachesize = new->se_fchannel.maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
|
|
for (i = 0; i < new->se_fchannel.maxreqs; i++) {
|
|
sp = kzalloc(sizeof(*sp) + cachesize, GFP_KERNEL);
|
|
if (!sp)
|
|
goto out_free;
|
|
new->se_slots[i] = sp;
|
|
}
|
|
|
|
new->se_client = clp;
|
|
gen_sessionid(new);
|
|
idx = hash_sessionid(&new->se_sessionid);
|
|
memcpy(clp->cl_sessionid.data, new->se_sessionid.data,
|
|
NFS4_MAX_SESSIONID_LEN);
|
|
|
|
new->se_flags = cses->flags;
|
|
kref_init(&new->se_ref);
|
|
spin_lock(&sessionid_lock);
|
|
list_add(&new->se_hash, &sessionid_hashtbl[idx]);
|
|
list_add(&new->se_perclnt, &clp->cl_sessions);
|
|
spin_unlock(&sessionid_lock);
|
|
|
|
status = nfs_ok;
|
|
out:
|
|
return status;
|
|
out_free:
|
|
free_session_slots(new);
|
|
kfree(new);
|
|
goto out;
|
|
}
|
|
|
|
/* caller must hold sessionid_lock */
|
|
static struct nfsd4_session *
|
|
find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
|
|
{
|
|
struct nfsd4_session *elem;
|
|
int idx;
|
|
|
|
dump_sessionid(__func__, sessionid);
|
|
idx = hash_sessionid(sessionid);
|
|
dprintk("%s: idx is %d\n", __func__, idx);
|
|
/* Search in the appropriate list */
|
|
list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
|
|
dump_sessionid("list traversal", &elem->se_sessionid);
|
|
if (!memcmp(elem->se_sessionid.data, sessionid->data,
|
|
NFS4_MAX_SESSIONID_LEN)) {
|
|
return elem;
|
|
}
|
|
}
|
|
|
|
dprintk("%s: session not found\n", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
/* caller must hold sessionid_lock */
|
|
static void
|
|
unhash_session(struct nfsd4_session *ses)
|
|
{
|
|
list_del(&ses->se_hash);
|
|
list_del(&ses->se_perclnt);
|
|
}
|
|
|
|
static void
|
|
release_session(struct nfsd4_session *ses)
|
|
{
|
|
spin_lock(&sessionid_lock);
|
|
unhash_session(ses);
|
|
spin_unlock(&sessionid_lock);
|
|
nfsd4_put_session(ses);
|
|
}
|
|
|
|
void
|
|
free_session(struct kref *kref)
|
|
{
|
|
struct nfsd4_session *ses;
|
|
|
|
ses = container_of(kref, struct nfsd4_session, se_ref);
|
|
spin_lock(&nfsd_drc_lock);
|
|
nfsd_drc_mem_used -= ses->se_fchannel.maxreqs * NFSD_SLOT_CACHE_SIZE;
|
|
spin_unlock(&nfsd_drc_lock);
|
|
free_session_slots(ses);
|
|
kfree(ses);
|
|
}
|
|
|
|
static inline void
|
|
renew_client(struct nfs4_client *clp)
|
|
{
|
|
/*
|
|
* Move client to the end to the LRU list.
|
|
*/
|
|
dprintk("renewing client (clientid %08x/%08x)\n",
|
|
clp->cl_clientid.cl_boot,
|
|
clp->cl_clientid.cl_id);
|
|
list_move_tail(&clp->cl_lru, &client_lru);
|
|
clp->cl_time = get_seconds();
|
|
}
|
|
|
|
/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
|
|
static int
|
|
STALE_CLIENTID(clientid_t *clid)
|
|
{
|
|
if (clid->cl_boot == boot_time)
|
|
return 0;
|
|
dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
|
|
clid->cl_boot, clid->cl_id, boot_time);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* XXX Should we use a slab cache ?
|
|
* This type of memory management is somewhat inefficient, but we use it
|
|
* anyway since SETCLIENTID is not a common operation.
|
|
*/
|
|
static struct nfs4_client *alloc_client(struct xdr_netobj name)
|
|
{
|
|
struct nfs4_client *clp;
|
|
|
|
clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
|
|
if (clp == NULL)
|
|
return NULL;
|
|
clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
|
|
if (clp->cl_name.data == NULL) {
|
|
kfree(clp);
|
|
return NULL;
|
|
}
|
|
memcpy(clp->cl_name.data, name.data, name.len);
|
|
clp->cl_name.len = name.len;
|
|
return clp;
|
|
}
|
|
|
|
static void
|
|
shutdown_callback_client(struct nfs4_client *clp)
|
|
{
|
|
struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
|
|
|
|
if (clnt) {
|
|
/*
|
|
* Callback threads take a reference on the client, so there
|
|
* should be no outstanding callbacks at this point.
|
|
*/
|
|
clp->cl_cb_conn.cb_client = NULL;
|
|
rpc_shutdown_client(clnt);
|
|
}
|
|
}
|
|
|
|
static inline void
|
|
free_client(struct nfs4_client *clp)
|
|
{
|
|
shutdown_callback_client(clp);
|
|
if (clp->cl_cb_xprt)
|
|
svc_xprt_put(clp->cl_cb_xprt);
|
|
if (clp->cl_cred.cr_group_info)
|
|
put_group_info(clp->cl_cred.cr_group_info);
|
|
kfree(clp->cl_principal);
|
|
kfree(clp->cl_name.data);
|
|
kfree(clp);
|
|
}
|
|
|
|
void
|
|
put_nfs4_client(struct nfs4_client *clp)
|
|
{
|
|
if (atomic_dec_and_test(&clp->cl_count))
|
|
free_client(clp);
|
|
}
|
|
|
|
static void
|
|
expire_client(struct nfs4_client *clp)
|
|
{
|
|
struct nfs4_stateowner *sop;
|
|
struct nfs4_delegation *dp;
|
|
struct list_head reaplist;
|
|
|
|
dprintk("NFSD: expire_client cl_count %d\n",
|
|
atomic_read(&clp->cl_count));
|
|
|
|
INIT_LIST_HEAD(&reaplist);
|
|
spin_lock(&recall_lock);
|
|
while (!list_empty(&clp->cl_delegations)) {
|
|
dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
|
|
dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
|
|
dp->dl_flock);
|
|
list_del_init(&dp->dl_perclnt);
|
|
list_move(&dp->dl_recall_lru, &reaplist);
|
|
}
|
|
spin_unlock(&recall_lock);
|
|
while (!list_empty(&reaplist)) {
|
|
dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
|
|
list_del_init(&dp->dl_recall_lru);
|
|
unhash_delegation(dp);
|
|
}
|
|
list_del(&clp->cl_idhash);
|
|
list_del(&clp->cl_strhash);
|
|
list_del(&clp->cl_lru);
|
|
while (!list_empty(&clp->cl_openowners)) {
|
|
sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
|
|
release_openowner(sop);
|
|
}
|
|
while (!list_empty(&clp->cl_sessions)) {
|
|
struct nfsd4_session *ses;
|
|
ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
|
|
se_perclnt);
|
|
release_session(ses);
|
|
}
|
|
put_nfs4_client(clp);
|
|
}
|
|
|
|
static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
|
|
{
|
|
memcpy(target->cl_verifier.data, source->data,
|
|
sizeof(target->cl_verifier.data));
|
|
}
|
|
|
|
static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
|
|
{
|
|
target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
|
|
target->cl_clientid.cl_id = source->cl_clientid.cl_id;
|
|
}
|
|
|
|
static void copy_cred(struct svc_cred *target, struct svc_cred *source)
|
|
{
|
|
target->cr_uid = source->cr_uid;
|
|
target->cr_gid = source->cr_gid;
|
|
target->cr_group_info = source->cr_group_info;
|
|
get_group_info(target->cr_group_info);
|
|
}
|
|
|
|
static int same_name(const char *n1, const char *n2)
|
|
{
|
|
return 0 == memcmp(n1, n2, HEXDIR_LEN);
|
|
}
|
|
|
|
static int
|
|
same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
|
|
{
|
|
return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
|
|
}
|
|
|
|
static int
|
|
same_clid(clientid_t *cl1, clientid_t *cl2)
|
|
{
|
|
return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
|
|
}
|
|
|
|
/* XXX what about NGROUP */
|
|
static int
|
|
same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
|
|
{
|
|
return cr1->cr_uid == cr2->cr_uid;
|
|
}
|
|
|
|
static void gen_clid(struct nfs4_client *clp)
|
|
{
|
|
static u32 current_clientid = 1;
|
|
|
|
clp->cl_clientid.cl_boot = boot_time;
|
|
clp->cl_clientid.cl_id = current_clientid++;
|
|
}
|
|
|
|
static void gen_confirm(struct nfs4_client *clp)
|
|
{
|
|
static u32 i;
|
|
u32 *p;
|
|
|
|
p = (u32 *)clp->cl_confirm.data;
|
|
*p++ = get_seconds();
|
|
*p++ = i++;
|
|
}
|
|
|
|
static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
|
|
struct svc_rqst *rqstp, nfs4_verifier *verf)
|
|
{
|
|
struct nfs4_client *clp;
|
|
struct sockaddr *sa = svc_addr(rqstp);
|
|
char *princ;
|
|
|
|
clp = alloc_client(name);
|
|
if (clp == NULL)
|
|
return NULL;
|
|
|
|
princ = svc_gss_principal(rqstp);
|
|
if (princ) {
|
|
clp->cl_principal = kstrdup(princ, GFP_KERNEL);
|
|
if (clp->cl_principal == NULL) {
|
|
free_client(clp);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
|
|
atomic_set(&clp->cl_count, 1);
|
|
atomic_set(&clp->cl_cb_conn.cb_set, 0);
|
|
INIT_LIST_HEAD(&clp->cl_idhash);
|
|
INIT_LIST_HEAD(&clp->cl_strhash);
|
|
INIT_LIST_HEAD(&clp->cl_openowners);
|
|
INIT_LIST_HEAD(&clp->cl_delegations);
|
|
INIT_LIST_HEAD(&clp->cl_sessions);
|
|
INIT_LIST_HEAD(&clp->cl_lru);
|
|
clear_bit(0, &clp->cl_cb_slot_busy);
|
|
rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
|
|
copy_verf(clp, verf);
|
|
rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
|
|
clp->cl_flavor = rqstp->rq_flavor;
|
|
copy_cred(&clp->cl_cred, &rqstp->rq_cred);
|
|
gen_confirm(clp);
|
|
|
|
return clp;
|
|
}
|
|
|
|
static int check_name(struct xdr_netobj name)
|
|
{
|
|
if (name.len == 0)
|
|
return 0;
|
|
if (name.len > NFS4_OPAQUE_LIMIT) {
|
|
dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
|
|
{
|
|
unsigned int idhashval;
|
|
|
|
list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
|
|
idhashval = clientid_hashval(clp->cl_clientid.cl_id);
|
|
list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
|
|
list_add_tail(&clp->cl_lru, &client_lru);
|
|
clp->cl_time = get_seconds();
|
|
}
|
|
|
|
static void
|
|
move_to_confirmed(struct nfs4_client *clp)
|
|
{
|
|
unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
|
|
unsigned int strhashval;
|
|
|
|
dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
|
|
list_del_init(&clp->cl_strhash);
|
|
list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
|
|
strhashval = clientstr_hashval(clp->cl_recdir);
|
|
list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
|
|
renew_client(clp);
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
find_confirmed_client(clientid_t *clid)
|
|
{
|
|
struct nfs4_client *clp;
|
|
unsigned int idhashval = clientid_hashval(clid->cl_id);
|
|
|
|
list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
|
|
if (same_clid(&clp->cl_clientid, clid))
|
|
return clp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
find_unconfirmed_client(clientid_t *clid)
|
|
{
|
|
struct nfs4_client *clp;
|
|
unsigned int idhashval = clientid_hashval(clid->cl_id);
|
|
|
|
list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
|
|
if (same_clid(&clp->cl_clientid, clid))
|
|
return clp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Return 1 iff clp's clientid establishment method matches the use_exchange_id
|
|
* parameter. Matching is based on the fact the at least one of the
|
|
* EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
|
|
*
|
|
* FIXME: we need to unify the clientid namespaces for nfsv4.x
|
|
* and correctly deal with client upgrade/downgrade in EXCHANGE_ID
|
|
* and SET_CLIENTID{,_CONFIRM}
|
|
*/
|
|
static inline int
|
|
match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id)
|
|
{
|
|
bool has_exchange_flags = (clp->cl_exchange_flags != 0);
|
|
return use_exchange_id == has_exchange_flags;
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
find_confirmed_client_by_str(const char *dname, unsigned int hashval,
|
|
bool use_exchange_id)
|
|
{
|
|
struct nfs4_client *clp;
|
|
|
|
list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
|
|
if (same_name(clp->cl_recdir, dname) &&
|
|
match_clientid_establishment(clp, use_exchange_id))
|
|
return clp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfs4_client *
|
|
find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
|
|
bool use_exchange_id)
|
|
{
|
|
struct nfs4_client *clp;
|
|
|
|
list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
|
|
if (same_name(clp->cl_recdir, dname) &&
|
|
match_clientid_establishment(clp, use_exchange_id))
|
|
return clp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, u32 scopeid)
|
|
{
|
|
struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
|
|
unsigned short expected_family;
|
|
|
|
/* Currently, we only support tcp and tcp6 for the callback channel */
|
|
if (se->se_callback_netid_len == 3 &&
|
|
!memcmp(se->se_callback_netid_val, "tcp", 3))
|
|
expected_family = AF_INET;
|
|
else if (se->se_callback_netid_len == 4 &&
|
|
!memcmp(se->se_callback_netid_val, "tcp6", 4))
|
|
expected_family = AF_INET6;
|
|
else
|
|
goto out_err;
|
|
|
|
cb->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val,
|
|
se->se_callback_addr_len,
|
|
(struct sockaddr *) &cb->cb_addr,
|
|
sizeof(cb->cb_addr));
|
|
|
|
if (!cb->cb_addrlen || cb->cb_addr.ss_family != expected_family)
|
|
goto out_err;
|
|
|
|
if (cb->cb_addr.ss_family == AF_INET6)
|
|
((struct sockaddr_in6 *) &cb->cb_addr)->sin6_scope_id = scopeid;
|
|
|
|
cb->cb_minorversion = 0;
|
|
cb->cb_prog = se->se_callback_prog;
|
|
cb->cb_ident = se->se_callback_ident;
|
|
return;
|
|
out_err:
|
|
cb->cb_addr.ss_family = AF_UNSPEC;
|
|
cb->cb_addrlen = 0;
|
|
dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
|
|
"will not receive delegations\n",
|
|
clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
|
|
*/
|
|
void
|
|
nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
|
|
{
|
|
struct nfsd4_slot *slot = resp->cstate.slot;
|
|
unsigned int base;
|
|
|
|
dprintk("--> %s slot %p\n", __func__, slot);
|
|
|
|
slot->sl_opcnt = resp->opcnt;
|
|
slot->sl_status = resp->cstate.status;
|
|
|
|
if (nfsd4_not_cached(resp)) {
|
|
slot->sl_datalen = 0;
|
|
return;
|
|
}
|
|
slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
|
|
base = (char *)resp->cstate.datap -
|
|
(char *)resp->xbuf->head[0].iov_base;
|
|
if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
|
|
slot->sl_datalen))
|
|
WARN("%s: sessions DRC could not cache compound\n", __func__);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Encode the replay sequence operation from the slot values.
|
|
* If cachethis is FALSE encode the uncached rep error on the next
|
|
* operation which sets resp->p and increments resp->opcnt for
|
|
* nfs4svc_encode_compoundres.
|
|
*
|
|
*/
|
|
static __be32
|
|
nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
|
|
struct nfsd4_compoundres *resp)
|
|
{
|
|
struct nfsd4_op *op;
|
|
struct nfsd4_slot *slot = resp->cstate.slot;
|
|
|
|
dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__,
|
|
resp->opcnt, resp->cstate.slot->sl_cachethis);
|
|
|
|
/* Encode the replayed sequence operation */
|
|
op = &args->ops[resp->opcnt - 1];
|
|
nfsd4_encode_operation(resp, op);
|
|
|
|
/* Return nfserr_retry_uncached_rep in next operation. */
|
|
if (args->opcnt > 1 && slot->sl_cachethis == 0) {
|
|
op = &args->ops[resp->opcnt++];
|
|
op->status = nfserr_retry_uncached_rep;
|
|
nfsd4_encode_operation(resp, op);
|
|
}
|
|
return op->status;
|
|
}
|
|
|
|
/*
|
|
* The sequence operation is not cached because we can use the slot and
|
|
* session values.
|
|
*/
|
|
__be32
|
|
nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
|
|
struct nfsd4_sequence *seq)
|
|
{
|
|
struct nfsd4_slot *slot = resp->cstate.slot;
|
|
__be32 status;
|
|
|
|
dprintk("--> %s slot %p\n", __func__, slot);
|
|
|
|
/* Either returns 0 or nfserr_retry_uncached */
|
|
status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
|
|
if (status == nfserr_retry_uncached_rep)
|
|
return status;
|
|
|
|
/* The sequence operation has been encoded, cstate->datap set. */
|
|
memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
|
|
|
|
resp->opcnt = slot->sl_opcnt;
|
|
resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
|
|
status = slot->sl_status;
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Set the exchange_id flags returned by the server.
|
|
*/
|
|
static void
|
|
nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
|
|
{
|
|
/* pNFS is not supported */
|
|
new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
|
|
|
|
/* Referrals are supported, Migration is not. */
|
|
new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
|
|
|
|
/* set the wire flags to return to client. */
|
|
clid->flags = new->cl_exchange_flags;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_exchange_id(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_exchange_id *exid)
|
|
{
|
|
struct nfs4_client *unconf, *conf, *new;
|
|
int status;
|
|
unsigned int strhashval;
|
|
char dname[HEXDIR_LEN];
|
|
char addr_str[INET6_ADDRSTRLEN];
|
|
nfs4_verifier verf = exid->verifier;
|
|
struct sockaddr *sa = svc_addr(rqstp);
|
|
|
|
rpc_ntop(sa, addr_str, sizeof(addr_str));
|
|
dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
|
|
"ip_addr=%s flags %x, spa_how %d\n",
|
|
__func__, rqstp, exid, exid->clname.len, exid->clname.data,
|
|
addr_str, exid->flags, exid->spa_how);
|
|
|
|
if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
|
|
return nfserr_inval;
|
|
|
|
/* Currently only support SP4_NONE */
|
|
switch (exid->spa_how) {
|
|
case SP4_NONE:
|
|
break;
|
|
case SP4_SSV:
|
|
return nfserr_encr_alg_unsupp;
|
|
default:
|
|
BUG(); /* checked by xdr code */
|
|
case SP4_MACH_CRED:
|
|
return nfserr_serverfault; /* no excuse :-/ */
|
|
}
|
|
|
|
status = nfs4_make_rec_clidname(dname, &exid->clname);
|
|
|
|
if (status)
|
|
goto error;
|
|
|
|
strhashval = clientstr_hashval(dname);
|
|
|
|
nfs4_lock_state();
|
|
status = nfs_ok;
|
|
|
|
conf = find_confirmed_client_by_str(dname, strhashval, true);
|
|
if (conf) {
|
|
if (!same_verf(&verf, &conf->cl_verifier)) {
|
|
/* 18.35.4 case 8 */
|
|
if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
|
|
status = nfserr_not_same;
|
|
goto out;
|
|
}
|
|
/* Client reboot: destroy old state */
|
|
expire_client(conf);
|
|
goto out_new;
|
|
}
|
|
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
|
|
/* 18.35.4 case 9 */
|
|
if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
|
|
status = nfserr_perm;
|
|
goto out;
|
|
}
|
|
expire_client(conf);
|
|
goto out_new;
|
|
}
|
|
/*
|
|
* Set bit when the owner id and verifier map to an already
|
|
* confirmed client id (18.35.3).
|
|
*/
|
|
exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
|
|
|
|
/*
|
|
* Falling into 18.35.4 case 2, possible router replay.
|
|
* Leave confirmed record intact and return same result.
|
|
*/
|
|
copy_verf(conf, &verf);
|
|
new = conf;
|
|
goto out_copy;
|
|
}
|
|
|
|
/* 18.35.4 case 7 */
|
|
if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
|
|
status = nfserr_noent;
|
|
goto out;
|
|
}
|
|
|
|
unconf = find_unconfirmed_client_by_str(dname, strhashval, true);
|
|
if (unconf) {
|
|
/*
|
|
* Possible retry or client restart. Per 18.35.4 case 4,
|
|
* a new unconfirmed record should be generated regardless
|
|
* of whether any properties have changed.
|
|
*/
|
|
expire_client(unconf);
|
|
}
|
|
|
|
out_new:
|
|
/* Normal case */
|
|
new = create_client(exid->clname, dname, rqstp, &verf);
|
|
if (new == NULL) {
|
|
status = nfserr_serverfault;
|
|
goto out;
|
|
}
|
|
|
|
gen_clid(new);
|
|
add_to_unconfirmed(new, strhashval);
|
|
out_copy:
|
|
exid->clientid.cl_boot = new->cl_clientid.cl_boot;
|
|
exid->clientid.cl_id = new->cl_clientid.cl_id;
|
|
|
|
exid->seqid = 1;
|
|
nfsd4_set_ex_flags(new, exid);
|
|
|
|
dprintk("nfsd4_exchange_id seqid %d flags %x\n",
|
|
new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
|
|
status = nfs_ok;
|
|
|
|
out:
|
|
nfs4_unlock_state();
|
|
error:
|
|
dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
|
|
{
|
|
dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
|
|
slot_seqid);
|
|
|
|
/* The slot is in use, and no response has been sent. */
|
|
if (slot_inuse) {
|
|
if (seqid == slot_seqid)
|
|
return nfserr_jukebox;
|
|
else
|
|
return nfserr_seq_misordered;
|
|
}
|
|
/* Normal */
|
|
if (likely(seqid == slot_seqid + 1))
|
|
return nfs_ok;
|
|
/* Replay */
|
|
if (seqid == slot_seqid)
|
|
return nfserr_replay_cache;
|
|
/* Wraparound */
|
|
if (seqid == 1 && (slot_seqid + 1) == 0)
|
|
return nfs_ok;
|
|
/* Misordered replay or misordered new request */
|
|
return nfserr_seq_misordered;
|
|
}
|
|
|
|
/*
|
|
* Cache the create session result into the create session single DRC
|
|
* slot cache by saving the xdr structure. sl_seqid has been set.
|
|
* Do this for solo or embedded create session operations.
|
|
*/
|
|
static void
|
|
nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
|
|
struct nfsd4_clid_slot *slot, int nfserr)
|
|
{
|
|
slot->sl_status = nfserr;
|
|
memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
|
|
}
|
|
|
|
static __be32
|
|
nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
|
|
struct nfsd4_clid_slot *slot)
|
|
{
|
|
memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
|
|
return slot->sl_status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_create_session(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_create_session *cr_ses)
|
|
{
|
|
struct sockaddr *sa = svc_addr(rqstp);
|
|
struct nfs4_client *conf, *unconf;
|
|
struct nfsd4_clid_slot *cs_slot = NULL;
|
|
int status = 0;
|
|
|
|
nfs4_lock_state();
|
|
unconf = find_unconfirmed_client(&cr_ses->clientid);
|
|
conf = find_confirmed_client(&cr_ses->clientid);
|
|
|
|
if (conf) {
|
|
cs_slot = &conf->cl_cs_slot;
|
|
status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
|
|
if (status == nfserr_replay_cache) {
|
|
dprintk("Got a create_session replay! seqid= %d\n",
|
|
cs_slot->sl_seqid);
|
|
/* Return the cached reply status */
|
|
status = nfsd4_replay_create_session(cr_ses, cs_slot);
|
|
goto out;
|
|
} else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
|
|
status = nfserr_seq_misordered;
|
|
dprintk("Sequence misordered!\n");
|
|
dprintk("Expected seqid= %d but got seqid= %d\n",
|
|
cs_slot->sl_seqid, cr_ses->seqid);
|
|
goto out;
|
|
}
|
|
cs_slot->sl_seqid++;
|
|
} else if (unconf) {
|
|
if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
|
|
!rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
|
|
status = nfserr_clid_inuse;
|
|
goto out;
|
|
}
|
|
|
|
cs_slot = &unconf->cl_cs_slot;
|
|
status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
|
|
if (status) {
|
|
/* an unconfirmed replay returns misordered */
|
|
status = nfserr_seq_misordered;
|
|
goto out_cache;
|
|
}
|
|
|
|
cs_slot->sl_seqid++; /* from 0 to 1 */
|
|
move_to_confirmed(unconf);
|
|
|
|
/*
|
|
* We do not support RDMA or persistent sessions
|
|
*/
|
|
cr_ses->flags &= ~SESSION4_PERSIST;
|
|
cr_ses->flags &= ~SESSION4_RDMA;
|
|
|
|
if (cr_ses->flags & SESSION4_BACK_CHAN) {
|
|
unconf->cl_cb_xprt = rqstp->rq_xprt;
|
|
svc_xprt_get(unconf->cl_cb_xprt);
|
|
rpc_copy_addr(
|
|
(struct sockaddr *)&unconf->cl_cb_conn.cb_addr,
|
|
sa);
|
|
unconf->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
|
|
unconf->cl_cb_conn.cb_minorversion =
|
|
cstate->minorversion;
|
|
unconf->cl_cb_conn.cb_prog = cr_ses->callback_prog;
|
|
unconf->cl_cb_seq_nr = 1;
|
|
nfsd4_probe_callback(unconf);
|
|
}
|
|
conf = unconf;
|
|
} else {
|
|
status = nfserr_stale_clientid;
|
|
goto out;
|
|
}
|
|
|
|
status = alloc_init_session(rqstp, conf, cr_ses);
|
|
if (status)
|
|
goto out;
|
|
|
|
memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data,
|
|
NFS4_MAX_SESSIONID_LEN);
|
|
cr_ses->seqid = cs_slot->sl_seqid;
|
|
|
|
out_cache:
|
|
/* cache solo and embedded create sessions under the state lock */
|
|
nfsd4_cache_create_session(cr_ses, cs_slot, status);
|
|
out:
|
|
nfs4_unlock_state();
|
|
dprintk("%s returns %d\n", __func__, ntohl(status));
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_destroy_session(struct svc_rqst *r,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_destroy_session *sessionid)
|
|
{
|
|
struct nfsd4_session *ses;
|
|
u32 status = nfserr_badsession;
|
|
|
|
/* Notes:
|
|
* - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
|
|
* - Should we return nfserr_back_chan_busy if waiting for
|
|
* callbacks on to-be-destroyed session?
|
|
* - Do we need to clear any callback info from previous session?
|
|
*/
|
|
|
|
dump_sessionid(__func__, &sessionid->sessionid);
|
|
spin_lock(&sessionid_lock);
|
|
ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
|
|
if (!ses) {
|
|
spin_unlock(&sessionid_lock);
|
|
goto out;
|
|
}
|
|
|
|
unhash_session(ses);
|
|
spin_unlock(&sessionid_lock);
|
|
|
|
/* wait for callbacks */
|
|
shutdown_callback_client(ses->se_client);
|
|
nfsd4_put_session(ses);
|
|
status = nfs_ok;
|
|
out:
|
|
dprintk("%s returns %d\n", __func__, ntohl(status));
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_sequence(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_sequence *seq)
|
|
{
|
|
struct nfsd4_compoundres *resp = rqstp->rq_resp;
|
|
struct nfsd4_session *session;
|
|
struct nfsd4_slot *slot;
|
|
int status;
|
|
|
|
if (resp->opcnt != 1)
|
|
return nfserr_sequence_pos;
|
|
|
|
spin_lock(&sessionid_lock);
|
|
status = nfserr_badsession;
|
|
session = find_in_sessionid_hashtbl(&seq->sessionid);
|
|
if (!session)
|
|
goto out;
|
|
|
|
status = nfserr_badslot;
|
|
if (seq->slotid >= session->se_fchannel.maxreqs)
|
|
goto out;
|
|
|
|
slot = session->se_slots[seq->slotid];
|
|
dprintk("%s: slotid %d\n", __func__, seq->slotid);
|
|
|
|
/* We do not negotiate the number of slots yet, so set the
|
|
* maxslots to the session maxreqs which is used to encode
|
|
* sr_highest_slotid and the sr_target_slot id to maxslots */
|
|
seq->maxslots = session->se_fchannel.maxreqs;
|
|
|
|
status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse);
|
|
if (status == nfserr_replay_cache) {
|
|
cstate->slot = slot;
|
|
cstate->session = session;
|
|
/* Return the cached reply status and set cstate->status
|
|
* for nfsd4_proc_compound processing */
|
|
status = nfsd4_replay_cache_entry(resp, seq);
|
|
cstate->status = nfserr_replay_cache;
|
|
goto out;
|
|
}
|
|
if (status)
|
|
goto out;
|
|
|
|
/* Success! bump slot seqid */
|
|
slot->sl_inuse = true;
|
|
slot->sl_seqid = seq->seqid;
|
|
slot->sl_cachethis = seq->cachethis;
|
|
|
|
cstate->slot = slot;
|
|
cstate->session = session;
|
|
|
|
/* Hold a session reference until done processing the compound:
|
|
* nfsd4_put_session called only if the cstate slot is set.
|
|
*/
|
|
nfsd4_get_session(session);
|
|
out:
|
|
spin_unlock(&sessionid_lock);
|
|
/* Renew the clientid on success and on replay */
|
|
if (cstate->session) {
|
|
nfs4_lock_state();
|
|
renew_client(session->se_client);
|
|
nfs4_unlock_state();
|
|
}
|
|
dprintk("%s: return %d\n", __func__, ntohl(status));
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_setclientid *setclid)
|
|
{
|
|
struct sockaddr *sa = svc_addr(rqstp);
|
|
struct xdr_netobj clname = {
|
|
.len = setclid->se_namelen,
|
|
.data = setclid->se_name,
|
|
};
|
|
nfs4_verifier clverifier = setclid->se_verf;
|
|
unsigned int strhashval;
|
|
struct nfs4_client *conf, *unconf, *new;
|
|
__be32 status;
|
|
char dname[HEXDIR_LEN];
|
|
|
|
if (!check_name(clname))
|
|
return nfserr_inval;
|
|
|
|
status = nfs4_make_rec_clidname(dname, &clname);
|
|
if (status)
|
|
return status;
|
|
|
|
/*
|
|
* XXX The Duplicate Request Cache (DRC) has been checked (??)
|
|
* We get here on a DRC miss.
|
|
*/
|
|
|
|
strhashval = clientstr_hashval(dname);
|
|
|
|
nfs4_lock_state();
|
|
conf = find_confirmed_client_by_str(dname, strhashval, false);
|
|
if (conf) {
|
|
/* RFC 3530 14.2.33 CASE 0: */
|
|
status = nfserr_clid_inuse;
|
|
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
|
|
char addr_str[INET6_ADDRSTRLEN];
|
|
rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
|
|
sizeof(addr_str));
|
|
dprintk("NFSD: setclientid: string in use by client "
|
|
"at %s\n", addr_str);
|
|
goto out;
|
|
}
|
|
}
|
|
/*
|
|
* section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
|
|
* has a description of SETCLIENTID request processing consisting
|
|
* of 5 bullet points, labeled as CASE0 - CASE4 below.
|
|
*/
|
|
unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
|
|
status = nfserr_resource;
|
|
if (!conf) {
|
|
/*
|
|
* RFC 3530 14.2.33 CASE 4:
|
|
* placed first, because it is the normal case
|
|
*/
|
|
if (unconf)
|
|
expire_client(unconf);
|
|
new = create_client(clname, dname, rqstp, &clverifier);
|
|
if (new == NULL)
|
|
goto out;
|
|
gen_clid(new);
|
|
} else if (same_verf(&conf->cl_verifier, &clverifier)) {
|
|
/*
|
|
* RFC 3530 14.2.33 CASE 1:
|
|
* probable callback update
|
|
*/
|
|
if (unconf) {
|
|
/* Note this is removing unconfirmed {*x***},
|
|
* which is stronger than RFC recommended {vxc**}.
|
|
* This has the advantage that there is at most
|
|
* one {*x***} in either list at any time.
|
|
*/
|
|
expire_client(unconf);
|
|
}
|
|
new = create_client(clname, dname, rqstp, &clverifier);
|
|
if (new == NULL)
|
|
goto out;
|
|
copy_clid(new, conf);
|
|
} else if (!unconf) {
|
|
/*
|
|
* RFC 3530 14.2.33 CASE 2:
|
|
* probable client reboot; state will be removed if
|
|
* confirmed.
|
|
*/
|
|
new = create_client(clname, dname, rqstp, &clverifier);
|
|
if (new == NULL)
|
|
goto out;
|
|
gen_clid(new);
|
|
} else {
|
|
/*
|
|
* RFC 3530 14.2.33 CASE 3:
|
|
* probable client reboot; state will be removed if
|
|
* confirmed.
|
|
*/
|
|
expire_client(unconf);
|
|
new = create_client(clname, dname, rqstp, &clverifier);
|
|
if (new == NULL)
|
|
goto out;
|
|
gen_clid(new);
|
|
}
|
|
gen_callback(new, setclid, rpc_get_scope_id(sa));
|
|
add_to_unconfirmed(new, strhashval);
|
|
setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
|
|
setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
|
|
memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
|
|
status = nfs_ok;
|
|
out:
|
|
nfs4_unlock_state();
|
|
return status;
|
|
}
|
|
|
|
|
|
/*
|
|
* Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
|
|
* a description of SETCLIENTID_CONFIRM request processing consisting of 4
|
|
* bullets, labeled as CASE1 - CASE4 below.
|
|
*/
|
|
__be32
|
|
nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_setclientid_confirm *setclientid_confirm)
|
|
{
|
|
struct sockaddr *sa = svc_addr(rqstp);
|
|
struct nfs4_client *conf, *unconf;
|
|
nfs4_verifier confirm = setclientid_confirm->sc_confirm;
|
|
clientid_t * clid = &setclientid_confirm->sc_clientid;
|
|
__be32 status;
|
|
|
|
if (STALE_CLIENTID(clid))
|
|
return nfserr_stale_clientid;
|
|
/*
|
|
* XXX The Duplicate Request Cache (DRC) has been checked (??)
|
|
* We get here on a DRC miss.
|
|
*/
|
|
|
|
nfs4_lock_state();
|
|
|
|
conf = find_confirmed_client(clid);
|
|
unconf = find_unconfirmed_client(clid);
|
|
|
|
status = nfserr_clid_inuse;
|
|
if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa))
|
|
goto out;
|
|
if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa))
|
|
goto out;
|
|
|
|
/*
|
|
* section 14.2.34 of RFC 3530 has a description of
|
|
* SETCLIENTID_CONFIRM request processing consisting
|
|
* of 4 bullet points, labeled as CASE1 - CASE4 below.
|
|
*/
|
|
if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
|
|
/*
|
|
* RFC 3530 14.2.34 CASE 1:
|
|
* callback update
|
|
*/
|
|
if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
|
|
status = nfserr_clid_inuse;
|
|
else {
|
|
/* XXX: We just turn off callbacks until we can handle
|
|
* change request correctly. */
|
|
atomic_set(&conf->cl_cb_conn.cb_set, 0);
|
|
expire_client(unconf);
|
|
status = nfs_ok;
|
|
|
|
}
|
|
} else if (conf && !unconf) {
|
|
/*
|
|
* RFC 3530 14.2.34 CASE 2:
|
|
* probable retransmitted request; play it safe and
|
|
* do nothing.
|
|
*/
|
|
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
|
|
status = nfserr_clid_inuse;
|
|
else
|
|
status = nfs_ok;
|
|
} else if (!conf && unconf
|
|
&& same_verf(&unconf->cl_confirm, &confirm)) {
|
|
/*
|
|
* RFC 3530 14.2.34 CASE 3:
|
|
* Normal case; new or rebooted client:
|
|
*/
|
|
if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
|
|
status = nfserr_clid_inuse;
|
|
} else {
|
|
unsigned int hash =
|
|
clientstr_hashval(unconf->cl_recdir);
|
|
conf = find_confirmed_client_by_str(unconf->cl_recdir,
|
|
hash, false);
|
|
if (conf) {
|
|
nfsd4_remove_clid_dir(conf);
|
|
expire_client(conf);
|
|
}
|
|
move_to_confirmed(unconf);
|
|
conf = unconf;
|
|
nfsd4_probe_callback(conf);
|
|
status = nfs_ok;
|
|
}
|
|
} else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
|
|
&& (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
|
|
&confirm)))) {
|
|
/*
|
|
* RFC 3530 14.2.34 CASE 4:
|
|
* Client probably hasn't noticed that we rebooted yet.
|
|
*/
|
|
status = nfserr_stale_clientid;
|
|
} else {
|
|
/* check that we have hit one of the cases...*/
|
|
status = nfserr_clid_inuse;
|
|
}
|
|
out:
|
|
nfs4_unlock_state();
|
|
return status;
|
|
}
|
|
|
|
/* OPEN Share state helper functions */
|
|
static inline struct nfs4_file *
|
|
alloc_init_file(struct inode *ino)
|
|
{
|
|
struct nfs4_file *fp;
|
|
unsigned int hashval = file_hashval(ino);
|
|
|
|
fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
|
|
if (fp) {
|
|
atomic_set(&fp->fi_ref, 1);
|
|
INIT_LIST_HEAD(&fp->fi_hash);
|
|
INIT_LIST_HEAD(&fp->fi_stateids);
|
|
INIT_LIST_HEAD(&fp->fi_delegations);
|
|
spin_lock(&recall_lock);
|
|
list_add(&fp->fi_hash, &file_hashtbl[hashval]);
|
|
spin_unlock(&recall_lock);
|
|
fp->fi_inode = igrab(ino);
|
|
fp->fi_id = current_fileid++;
|
|
fp->fi_had_conflict = false;
|
|
return fp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
nfsd4_free_slab(struct kmem_cache **slab)
|
|
{
|
|
if (*slab == NULL)
|
|
return;
|
|
kmem_cache_destroy(*slab);
|
|
*slab = NULL;
|
|
}
|
|
|
|
void
|
|
nfsd4_free_slabs(void)
|
|
{
|
|
nfsd4_free_slab(&stateowner_slab);
|
|
nfsd4_free_slab(&file_slab);
|
|
nfsd4_free_slab(&stateid_slab);
|
|
nfsd4_free_slab(&deleg_slab);
|
|
}
|
|
|
|
static int
|
|
nfsd4_init_slabs(void)
|
|
{
|
|
stateowner_slab = kmem_cache_create("nfsd4_stateowners",
|
|
sizeof(struct nfs4_stateowner), 0, 0, NULL);
|
|
if (stateowner_slab == NULL)
|
|
goto out_nomem;
|
|
file_slab = kmem_cache_create("nfsd4_files",
|
|
sizeof(struct nfs4_file), 0, 0, NULL);
|
|
if (file_slab == NULL)
|
|
goto out_nomem;
|
|
stateid_slab = kmem_cache_create("nfsd4_stateids",
|
|
sizeof(struct nfs4_stateid), 0, 0, NULL);
|
|
if (stateid_slab == NULL)
|
|
goto out_nomem;
|
|
deleg_slab = kmem_cache_create("nfsd4_delegations",
|
|
sizeof(struct nfs4_delegation), 0, 0, NULL);
|
|
if (deleg_slab == NULL)
|
|
goto out_nomem;
|
|
return 0;
|
|
out_nomem:
|
|
nfsd4_free_slabs();
|
|
dprintk("nfsd4: out of memory while initializing nfsv4\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void
|
|
nfs4_free_stateowner(struct kref *kref)
|
|
{
|
|
struct nfs4_stateowner *sop =
|
|
container_of(kref, struct nfs4_stateowner, so_ref);
|
|
kfree(sop->so_owner.data);
|
|
kmem_cache_free(stateowner_slab, sop);
|
|
}
|
|
|
|
static inline struct nfs4_stateowner *
|
|
alloc_stateowner(struct xdr_netobj *owner)
|
|
{
|
|
struct nfs4_stateowner *sop;
|
|
|
|
if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
|
|
if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
|
|
memcpy(sop->so_owner.data, owner->data, owner->len);
|
|
sop->so_owner.len = owner->len;
|
|
kref_init(&sop->so_ref);
|
|
return sop;
|
|
}
|
|
kmem_cache_free(stateowner_slab, sop);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfs4_stateowner *
|
|
alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
|
|
struct nfs4_stateowner *sop;
|
|
struct nfs4_replay *rp;
|
|
unsigned int idhashval;
|
|
|
|
if (!(sop = alloc_stateowner(&open->op_owner)))
|
|
return NULL;
|
|
idhashval = ownerid_hashval(current_ownerid);
|
|
INIT_LIST_HEAD(&sop->so_idhash);
|
|
INIT_LIST_HEAD(&sop->so_strhash);
|
|
INIT_LIST_HEAD(&sop->so_perclient);
|
|
INIT_LIST_HEAD(&sop->so_stateids);
|
|
INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
|
|
INIT_LIST_HEAD(&sop->so_close_lru);
|
|
sop->so_time = 0;
|
|
list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
|
|
list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
|
|
list_add(&sop->so_perclient, &clp->cl_openowners);
|
|
sop->so_is_open_owner = 1;
|
|
sop->so_id = current_ownerid++;
|
|
sop->so_client = clp;
|
|
sop->so_seqid = open->op_seqid;
|
|
sop->so_confirmed = 0;
|
|
rp = &sop->so_replay;
|
|
rp->rp_status = nfserr_serverfault;
|
|
rp->rp_buflen = 0;
|
|
rp->rp_buf = rp->rp_ibuf;
|
|
return sop;
|
|
}
|
|
|
|
static inline void
|
|
init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
|
|
struct nfs4_stateowner *sop = open->op_stateowner;
|
|
unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
|
|
|
|
INIT_LIST_HEAD(&stp->st_hash);
|
|
INIT_LIST_HEAD(&stp->st_perstateowner);
|
|
INIT_LIST_HEAD(&stp->st_lockowners);
|
|
INIT_LIST_HEAD(&stp->st_perfile);
|
|
list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
|
|
list_add(&stp->st_perstateowner, &sop->so_stateids);
|
|
list_add(&stp->st_perfile, &fp->fi_stateids);
|
|
stp->st_stateowner = sop;
|
|
get_nfs4_file(fp);
|
|
stp->st_file = fp;
|
|
stp->st_stateid.si_boot = get_seconds();
|
|
stp->st_stateid.si_stateownerid = sop->so_id;
|
|
stp->st_stateid.si_fileid = fp->fi_id;
|
|
stp->st_stateid.si_generation = 0;
|
|
stp->st_access_bmap = 0;
|
|
stp->st_deny_bmap = 0;
|
|
__set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK,
|
|
&stp->st_access_bmap);
|
|
__set_bit(open->op_share_deny, &stp->st_deny_bmap);
|
|
stp->st_openstp = NULL;
|
|
}
|
|
|
|
static void
|
|
move_to_close_lru(struct nfs4_stateowner *sop)
|
|
{
|
|
dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
|
|
|
|
list_move_tail(&sop->so_close_lru, &close_lru);
|
|
sop->so_time = get_seconds();
|
|
}
|
|
|
|
static int
|
|
same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
|
|
clientid_t *clid)
|
|
{
|
|
return (sop->so_owner.len == owner->len) &&
|
|
0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
|
|
(sop->so_client->cl_clientid.cl_id == clid->cl_id);
|
|
}
|
|
|
|
static struct nfs4_stateowner *
|
|
find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
|
|
{
|
|
struct nfs4_stateowner *so = NULL;
|
|
|
|
list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
|
|
if (same_owner_str(so, &open->op_owner, &open->op_clientid))
|
|
return so;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* search file_hashtbl[] for file */
|
|
static struct nfs4_file *
|
|
find_file(struct inode *ino)
|
|
{
|
|
unsigned int hashval = file_hashval(ino);
|
|
struct nfs4_file *fp;
|
|
|
|
spin_lock(&recall_lock);
|
|
list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
|
|
if (fp->fi_inode == ino) {
|
|
get_nfs4_file(fp);
|
|
spin_unlock(&recall_lock);
|
|
return fp;
|
|
}
|
|
}
|
|
spin_unlock(&recall_lock);
|
|
return NULL;
|
|
}
|
|
|
|
static inline int access_valid(u32 x, u32 minorversion)
|
|
{
|
|
if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ)
|
|
return 0;
|
|
if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH)
|
|
return 0;
|
|
x &= ~NFS4_SHARE_ACCESS_MASK;
|
|
if (minorversion && x) {
|
|
if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL)
|
|
return 0;
|
|
if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED)
|
|
return 0;
|
|
x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK);
|
|
}
|
|
if (x)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static inline int deny_valid(u32 x)
|
|
{
|
|
/* Note: unlike access bits, deny bits may be zero. */
|
|
return x <= NFS4_SHARE_DENY_BOTH;
|
|
}
|
|
|
|
/*
|
|
* We store the NONE, READ, WRITE, and BOTH bits separately in the
|
|
* st_{access,deny}_bmap field of the stateid, in order to track not
|
|
* only what share bits are currently in force, but also what
|
|
* combinations of share bits previous opens have used. This allows us
|
|
* to enforce the recommendation of rfc 3530 14.2.19 that the server
|
|
* return an error if the client attempt to downgrade to a combination
|
|
* of share bits not explicable by closing some of its previous opens.
|
|
*
|
|
* XXX: This enforcement is actually incomplete, since we don't keep
|
|
* track of access/deny bit combinations; so, e.g., we allow:
|
|
*
|
|
* OPEN allow read, deny write
|
|
* OPEN allow both, deny none
|
|
* DOWNGRADE allow read, deny none
|
|
*
|
|
* which we should reject.
|
|
*/
|
|
static void
|
|
set_access(unsigned int *access, unsigned long bmap) {
|
|
int i;
|
|
|
|
*access = 0;
|
|
for (i = 1; i < 4; i++) {
|
|
if (test_bit(i, &bmap))
|
|
*access |= i;
|
|
}
|
|
}
|
|
|
|
static void
|
|
set_deny(unsigned int *deny, unsigned long bmap) {
|
|
int i;
|
|
|
|
*deny = 0;
|
|
for (i = 0; i < 4; i++) {
|
|
if (test_bit(i, &bmap))
|
|
*deny |= i ;
|
|
}
|
|
}
|
|
|
|
static int
|
|
test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
|
|
unsigned int access, deny;
|
|
|
|
set_access(&access, stp->st_access_bmap);
|
|
set_deny(&deny, stp->st_deny_bmap);
|
|
if ((access & open->op_share_deny) || (deny & open->op_share_access))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Called to check deny when READ with all zero stateid or
|
|
* WRITE with all zero or all one stateid
|
|
*/
|
|
static __be32
|
|
nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
|
|
{
|
|
struct inode *ino = current_fh->fh_dentry->d_inode;
|
|
struct nfs4_file *fp;
|
|
struct nfs4_stateid *stp;
|
|
__be32 ret;
|
|
|
|
dprintk("NFSD: nfs4_share_conflict\n");
|
|
|
|
fp = find_file(ino);
|
|
if (!fp)
|
|
return nfs_ok;
|
|
ret = nfserr_locked;
|
|
/* Search for conflicting share reservations */
|
|
list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
|
|
if (test_bit(deny_type, &stp->st_deny_bmap) ||
|
|
test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
|
|
goto out;
|
|
}
|
|
ret = nfs_ok;
|
|
out:
|
|
put_nfs4_file(fp);
|
|
return ret;
|
|
}
|
|
|
|
static inline void
|
|
nfs4_file_downgrade(struct file *filp, unsigned int share_access)
|
|
{
|
|
if (share_access & NFS4_SHARE_ACCESS_WRITE) {
|
|
drop_file_write_access(filp);
|
|
filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Spawn a thread to perform a recall on the delegation represented
|
|
* by the lease (file_lock)
|
|
*
|
|
* Called from break_lease() with lock_kernel() held.
|
|
* Note: we assume break_lease will only call this *once* for any given
|
|
* lease.
|
|
*/
|
|
static
|
|
void nfsd_break_deleg_cb(struct file_lock *fl)
|
|
{
|
|
struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
|
|
|
|
dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
|
|
if (!dp)
|
|
return;
|
|
|
|
/* We're assuming the state code never drops its reference
|
|
* without first removing the lease. Since we're in this lease
|
|
* callback (and since the lease code is serialized by the kernel
|
|
* lock) we know the server hasn't removed the lease yet, we know
|
|
* it's safe to take a reference: */
|
|
atomic_inc(&dp->dl_count);
|
|
atomic_inc(&dp->dl_client->cl_count);
|
|
|
|
spin_lock(&recall_lock);
|
|
list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
|
|
spin_unlock(&recall_lock);
|
|
|
|
/* only place dl_time is set. protected by lock_kernel*/
|
|
dp->dl_time = get_seconds();
|
|
|
|
/*
|
|
* We don't want the locks code to timeout the lease for us;
|
|
* we'll remove it ourself if the delegation isn't returned
|
|
* in time.
|
|
*/
|
|
fl->fl_break_time = 0;
|
|
|
|
dp->dl_file->fi_had_conflict = true;
|
|
nfsd4_cb_recall(dp);
|
|
}
|
|
|
|
/*
|
|
* The file_lock is being reapd.
|
|
*
|
|
* Called by locks_free_lock() with lock_kernel() held.
|
|
*/
|
|
static
|
|
void nfsd_release_deleg_cb(struct file_lock *fl)
|
|
{
|
|
struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
|
|
|
|
dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
|
|
|
|
if (!(fl->fl_flags & FL_LEASE) || !dp)
|
|
return;
|
|
dp->dl_flock = NULL;
|
|
}
|
|
|
|
/*
|
|
* Set the delegation file_lock back pointer.
|
|
*
|
|
* Called from setlease() with lock_kernel() held.
|
|
*/
|
|
static
|
|
void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
|
|
{
|
|
struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
|
|
|
|
dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
|
|
if (!dp)
|
|
return;
|
|
dp->dl_flock = new;
|
|
}
|
|
|
|
/*
|
|
* Called from setlease() with lock_kernel() held
|
|
*/
|
|
static
|
|
int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
|
|
{
|
|
struct nfs4_delegation *onlistd =
|
|
(struct nfs4_delegation *)onlist->fl_owner;
|
|
struct nfs4_delegation *tryd =
|
|
(struct nfs4_delegation *)try->fl_owner;
|
|
|
|
if (onlist->fl_lmops != try->fl_lmops)
|
|
return 0;
|
|
|
|
return onlistd->dl_client == tryd->dl_client;
|
|
}
|
|
|
|
|
|
static
|
|
int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
|
|
{
|
|
if (arg & F_UNLCK)
|
|
return lease_modify(onlist, arg);
|
|
else
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static const struct lock_manager_operations nfsd_lease_mng_ops = {
|
|
.fl_break = nfsd_break_deleg_cb,
|
|
.fl_release_private = nfsd_release_deleg_cb,
|
|
.fl_copy_lock = nfsd_copy_lock_deleg_cb,
|
|
.fl_mylease = nfsd_same_client_deleg_cb,
|
|
.fl_change = nfsd_change_deleg_cb,
|
|
};
|
|
|
|
|
|
__be32
|
|
nfsd4_process_open1(struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_open *open)
|
|
{
|
|
clientid_t *clientid = &open->op_clientid;
|
|
struct nfs4_client *clp = NULL;
|
|
unsigned int strhashval;
|
|
struct nfs4_stateowner *sop = NULL;
|
|
|
|
if (!check_name(open->op_owner))
|
|
return nfserr_inval;
|
|
|
|
if (STALE_CLIENTID(&open->op_clientid))
|
|
return nfserr_stale_clientid;
|
|
|
|
strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
|
|
sop = find_openstateowner_str(strhashval, open);
|
|
open->op_stateowner = sop;
|
|
if (!sop) {
|
|
/* Make sure the client's lease hasn't expired. */
|
|
clp = find_confirmed_client(clientid);
|
|
if (clp == NULL)
|
|
return nfserr_expired;
|
|
goto renew;
|
|
}
|
|
/* When sessions are used, skip open sequenceid processing */
|
|
if (nfsd4_has_session(cstate))
|
|
goto renew;
|
|
if (!sop->so_confirmed) {
|
|
/* Replace unconfirmed owners without checking for replay. */
|
|
clp = sop->so_client;
|
|
release_openowner(sop);
|
|
open->op_stateowner = NULL;
|
|
goto renew;
|
|
}
|
|
if (open->op_seqid == sop->so_seqid - 1) {
|
|
if (sop->so_replay.rp_buflen)
|
|
return nfserr_replay_me;
|
|
/* The original OPEN failed so spectacularly
|
|
* that we don't even have replay data saved!
|
|
* Therefore, we have no choice but to continue
|
|
* processing this OPEN; presumably, we'll
|
|
* fail again for the same reason.
|
|
*/
|
|
dprintk("nfsd4_process_open1: replay with no replay cache\n");
|
|
goto renew;
|
|
}
|
|
if (open->op_seqid != sop->so_seqid)
|
|
return nfserr_bad_seqid;
|
|
renew:
|
|
if (open->op_stateowner == NULL) {
|
|
sop = alloc_init_open_stateowner(strhashval, clp, open);
|
|
if (sop == NULL)
|
|
return nfserr_resource;
|
|
open->op_stateowner = sop;
|
|
}
|
|
list_del_init(&sop->so_close_lru);
|
|
renew_client(sop->so_client);
|
|
return nfs_ok;
|
|
}
|
|
|
|
static inline __be32
|
|
nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
|
|
{
|
|
if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
|
|
return nfserr_openmode;
|
|
else
|
|
return nfs_ok;
|
|
}
|
|
|
|
static struct nfs4_delegation *
|
|
find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
|
|
{
|
|
struct nfs4_delegation *dp;
|
|
|
|
list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
|
|
if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
|
|
return dp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static __be32
|
|
nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
|
|
struct nfs4_delegation **dp)
|
|
{
|
|
int flags;
|
|
__be32 status = nfserr_bad_stateid;
|
|
|
|
*dp = find_delegation_file(fp, &open->op_delegate_stateid);
|
|
if (*dp == NULL)
|
|
goto out;
|
|
flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
|
|
RD_STATE : WR_STATE;
|
|
status = nfs4_check_delegmode(*dp, flags);
|
|
if (status)
|
|
*dp = NULL;
|
|
out:
|
|
if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
|
|
return nfs_ok;
|
|
if (status)
|
|
return status;
|
|
open->op_stateowner->so_confirmed = 1;
|
|
return nfs_ok;
|
|
}
|
|
|
|
static __be32
|
|
nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
|
|
{
|
|
struct nfs4_stateid *local;
|
|
__be32 status = nfserr_share_denied;
|
|
struct nfs4_stateowner *sop = open->op_stateowner;
|
|
|
|
list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
|
|
/* ignore lock owners */
|
|
if (local->st_stateowner->so_is_open_owner == 0)
|
|
continue;
|
|
/* remember if we have seen this open owner */
|
|
if (local->st_stateowner == sop)
|
|
*stpp = local;
|
|
/* check for conflicting share reservations */
|
|
if (!test_share(local, open))
|
|
goto out;
|
|
}
|
|
status = 0;
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static inline struct nfs4_stateid *
|
|
nfs4_alloc_stateid(void)
|
|
{
|
|
return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
|
|
}
|
|
|
|
static __be32
|
|
nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
|
|
struct nfs4_delegation *dp,
|
|
struct svc_fh *cur_fh, int flags)
|
|
{
|
|
struct nfs4_stateid *stp;
|
|
|
|
stp = nfs4_alloc_stateid();
|
|
if (stp == NULL)
|
|
return nfserr_resource;
|
|
|
|
if (dp) {
|
|
get_file(dp->dl_vfs_file);
|
|
stp->st_vfs_file = dp->dl_vfs_file;
|
|
} else {
|
|
__be32 status;
|
|
status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
|
|
&stp->st_vfs_file);
|
|
if (status) {
|
|
if (status == nfserr_dropit)
|
|
status = nfserr_jukebox;
|
|
kmem_cache_free(stateid_slab, stp);
|
|
return status;
|
|
}
|
|
}
|
|
*stpp = stp;
|
|
return 0;
|
|
}
|
|
|
|
static inline __be32
|
|
nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
|
|
struct nfsd4_open *open)
|
|
{
|
|
struct iattr iattr = {
|
|
.ia_valid = ATTR_SIZE,
|
|
.ia_size = 0,
|
|
};
|
|
if (!open->op_truncate)
|
|
return 0;
|
|
if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
|
|
return nfserr_inval;
|
|
return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
|
|
}
|
|
|
|
static __be32
|
|
nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
|
|
{
|
|
struct file *filp = stp->st_vfs_file;
|
|
struct inode *inode = filp->f_path.dentry->d_inode;
|
|
unsigned int share_access, new_writer;
|
|
__be32 status;
|
|
|
|
set_access(&share_access, stp->st_access_bmap);
|
|
new_writer = (~share_access) & open->op_share_access
|
|
& NFS4_SHARE_ACCESS_WRITE;
|
|
|
|
if (new_writer) {
|
|
int err = get_write_access(inode);
|
|
if (err)
|
|
return nfserrno(err);
|
|
err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
|
|
if (err)
|
|
return nfserrno(err);
|
|
file_take_write(filp);
|
|
}
|
|
status = nfsd4_truncate(rqstp, cur_fh, open);
|
|
if (status) {
|
|
if (new_writer)
|
|
put_write_access(inode);
|
|
return status;
|
|
}
|
|
/* remember the open */
|
|
filp->f_mode |= open->op_share_access;
|
|
__set_bit(open->op_share_access, &stp->st_access_bmap);
|
|
__set_bit(open->op_share_deny, &stp->st_deny_bmap);
|
|
|
|
return nfs_ok;
|
|
}
|
|
|
|
|
|
static void
|
|
nfs4_set_claim_prev(struct nfsd4_open *open)
|
|
{
|
|
open->op_stateowner->so_confirmed = 1;
|
|
open->op_stateowner->so_client->cl_firststate = 1;
|
|
}
|
|
|
|
/*
|
|
* Attempt to hand out a delegation.
|
|
*/
|
|
static void
|
|
nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
|
|
{
|
|
struct nfs4_delegation *dp;
|
|
struct nfs4_stateowner *sop = stp->st_stateowner;
|
|
struct nfs4_cb_conn *cb = &sop->so_client->cl_cb_conn;
|
|
struct file_lock fl, *flp = &fl;
|
|
int status, flag = 0;
|
|
|
|
flag = NFS4_OPEN_DELEGATE_NONE;
|
|
open->op_recall = 0;
|
|
switch (open->op_claim_type) {
|
|
case NFS4_OPEN_CLAIM_PREVIOUS:
|
|
if (!atomic_read(&cb->cb_set))
|
|
open->op_recall = 1;
|
|
flag = open->op_delegate_type;
|
|
if (flag == NFS4_OPEN_DELEGATE_NONE)
|
|
goto out;
|
|
break;
|
|
case NFS4_OPEN_CLAIM_NULL:
|
|
/* Let's not give out any delegations till everyone's
|
|
* had the chance to reclaim theirs.... */
|
|
if (locks_in_grace())
|
|
goto out;
|
|
if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
|
|
goto out;
|
|
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
|
|
flag = NFS4_OPEN_DELEGATE_WRITE;
|
|
else
|
|
flag = NFS4_OPEN_DELEGATE_READ;
|
|
break;
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
|
|
if (dp == NULL) {
|
|
flag = NFS4_OPEN_DELEGATE_NONE;
|
|
goto out;
|
|
}
|
|
locks_init_lock(&fl);
|
|
fl.fl_lmops = &nfsd_lease_mng_ops;
|
|
fl.fl_flags = FL_LEASE;
|
|
fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
|
|
fl.fl_end = OFFSET_MAX;
|
|
fl.fl_owner = (fl_owner_t)dp;
|
|
fl.fl_file = stp->st_vfs_file;
|
|
fl.fl_pid = current->tgid;
|
|
|
|
/* vfs_setlease checks to see if delegation should be handed out.
|
|
* the lock_manager callbacks fl_mylease and fl_change are used
|
|
*/
|
|
if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
|
|
dprintk("NFSD: setlease failed [%d], no delegation\n", status);
|
|
unhash_delegation(dp);
|
|
flag = NFS4_OPEN_DELEGATE_NONE;
|
|
goto out;
|
|
}
|
|
|
|
memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
|
|
|
|
dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
|
|
dp->dl_stateid.si_boot,
|
|
dp->dl_stateid.si_stateownerid,
|
|
dp->dl_stateid.si_fileid,
|
|
dp->dl_stateid.si_generation);
|
|
out:
|
|
if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
|
|
&& flag == NFS4_OPEN_DELEGATE_NONE
|
|
&& open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
|
|
dprintk("NFSD: WARNING: refusing delegation reclaim\n");
|
|
open->op_delegate_type = flag;
|
|
}
|
|
|
|
/*
|
|
* called with nfs4_lock_state() held.
|
|
*/
|
|
__be32
|
|
nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
|
|
{
|
|
struct nfsd4_compoundres *resp = rqstp->rq_resp;
|
|
struct nfs4_file *fp = NULL;
|
|
struct inode *ino = current_fh->fh_dentry->d_inode;
|
|
struct nfs4_stateid *stp = NULL;
|
|
struct nfs4_delegation *dp = NULL;
|
|
__be32 status;
|
|
|
|
status = nfserr_inval;
|
|
if (!access_valid(open->op_share_access, resp->cstate.minorversion)
|
|
|| !deny_valid(open->op_share_deny))
|
|
goto out;
|
|
/*
|
|
* Lookup file; if found, lookup stateid and check open request,
|
|
* and check for delegations in the process of being recalled.
|
|
* If not found, create the nfs4_file struct
|
|
*/
|
|
fp = find_file(ino);
|
|
if (fp) {
|
|
if ((status = nfs4_check_open(fp, open, &stp)))
|
|
goto out;
|
|
status = nfs4_check_deleg(fp, open, &dp);
|
|
if (status)
|
|
goto out;
|
|
} else {
|
|
status = nfserr_bad_stateid;
|
|
if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
|
|
goto out;
|
|
status = nfserr_resource;
|
|
fp = alloc_init_file(ino);
|
|
if (fp == NULL)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* OPEN the file, or upgrade an existing OPEN.
|
|
* If truncate fails, the OPEN fails.
|
|
*/
|
|
if (stp) {
|
|
/* Stateid was found, this is an OPEN upgrade */
|
|
status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
|
|
if (status)
|
|
goto out;
|
|
update_stateid(&stp->st_stateid);
|
|
} else {
|
|
/* Stateid was not found, this is a new OPEN */
|
|
int flags = 0;
|
|
if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
|
|
flags |= NFSD_MAY_READ;
|
|
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
|
|
flags |= NFSD_MAY_WRITE;
|
|
status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
|
|
if (status)
|
|
goto out;
|
|
init_stateid(stp, fp, open);
|
|
status = nfsd4_truncate(rqstp, current_fh, open);
|
|
if (status) {
|
|
release_open_stateid(stp);
|
|
goto out;
|
|
}
|
|
if (nfsd4_has_session(&resp->cstate))
|
|
update_stateid(&stp->st_stateid);
|
|
}
|
|
memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
|
|
|
|
if (nfsd4_has_session(&resp->cstate))
|
|
open->op_stateowner->so_confirmed = 1;
|
|
|
|
/*
|
|
* Attempt to hand out a delegation. No error return, because the
|
|
* OPEN succeeds even if we fail.
|
|
*/
|
|
nfs4_open_delegation(current_fh, open, stp);
|
|
|
|
status = nfs_ok;
|
|
|
|
dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
|
|
stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
|
|
stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
|
|
out:
|
|
if (fp)
|
|
put_nfs4_file(fp);
|
|
if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
|
|
nfs4_set_claim_prev(open);
|
|
/*
|
|
* To finish the open response, we just need to set the rflags.
|
|
*/
|
|
open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
|
|
if (!open->op_stateowner->so_confirmed &&
|
|
!nfsd4_has_session(&resp->cstate))
|
|
open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
|
|
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
clientid_t *clid)
|
|
{
|
|
struct nfs4_client *clp;
|
|
__be32 status;
|
|
|
|
nfs4_lock_state();
|
|
dprintk("process_renew(%08x/%08x): starting\n",
|
|
clid->cl_boot, clid->cl_id);
|
|
status = nfserr_stale_clientid;
|
|
if (STALE_CLIENTID(clid))
|
|
goto out;
|
|
clp = find_confirmed_client(clid);
|
|
status = nfserr_expired;
|
|
if (clp == NULL) {
|
|
/* We assume the client took too long to RENEW. */
|
|
dprintk("nfsd4_renew: clientid not found!\n");
|
|
goto out;
|
|
}
|
|
renew_client(clp);
|
|
status = nfserr_cb_path_down;
|
|
if (!list_empty(&clp->cl_delegations)
|
|
&& !atomic_read(&clp->cl_cb_conn.cb_set))
|
|
goto out;
|
|
status = nfs_ok;
|
|
out:
|
|
nfs4_unlock_state();
|
|
return status;
|
|
}
|
|
|
|
struct lock_manager nfsd4_manager = {
|
|
};
|
|
|
|
static void
|
|
nfsd4_end_grace(void)
|
|
{
|
|
dprintk("NFSD: end of grace period\n");
|
|
nfsd4_recdir_purge_old();
|
|
locks_end_grace(&nfsd4_manager);
|
|
}
|
|
|
|
static time_t
|
|
nfs4_laundromat(void)
|
|
{
|
|
struct nfs4_client *clp;
|
|
struct nfs4_stateowner *sop;
|
|
struct nfs4_delegation *dp;
|
|
struct list_head *pos, *next, reaplist;
|
|
time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
|
|
time_t t, clientid_val = NFSD_LEASE_TIME;
|
|
time_t u, test_val = NFSD_LEASE_TIME;
|
|
|
|
nfs4_lock_state();
|
|
|
|
dprintk("NFSD: laundromat service - starting\n");
|
|
if (locks_in_grace())
|
|
nfsd4_end_grace();
|
|
list_for_each_safe(pos, next, &client_lru) {
|
|
clp = list_entry(pos, struct nfs4_client, cl_lru);
|
|
if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
|
|
t = clp->cl_time - cutoff;
|
|
if (clientid_val > t)
|
|
clientid_val = t;
|
|
break;
|
|
}
|
|
dprintk("NFSD: purging unused client (clientid %08x)\n",
|
|
clp->cl_clientid.cl_id);
|
|
nfsd4_remove_clid_dir(clp);
|
|
expire_client(clp);
|
|
}
|
|
INIT_LIST_HEAD(&reaplist);
|
|
spin_lock(&recall_lock);
|
|
list_for_each_safe(pos, next, &del_recall_lru) {
|
|
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
|
|
if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
|
|
u = dp->dl_time - cutoff;
|
|
if (test_val > u)
|
|
test_val = u;
|
|
break;
|
|
}
|
|
dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
|
|
dp, dp->dl_flock);
|
|
list_move(&dp->dl_recall_lru, &reaplist);
|
|
}
|
|
spin_unlock(&recall_lock);
|
|
list_for_each_safe(pos, next, &reaplist) {
|
|
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
|
|
list_del_init(&dp->dl_recall_lru);
|
|
unhash_delegation(dp);
|
|
}
|
|
test_val = NFSD_LEASE_TIME;
|
|
list_for_each_safe(pos, next, &close_lru) {
|
|
sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
|
|
if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
|
|
u = sop->so_time - cutoff;
|
|
if (test_val > u)
|
|
test_val = u;
|
|
break;
|
|
}
|
|
dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
|
|
sop->so_id);
|
|
release_openowner(sop);
|
|
}
|
|
if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
|
|
clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
|
|
nfs4_unlock_state();
|
|
return clientid_val;
|
|
}
|
|
|
|
static struct workqueue_struct *laundry_wq;
|
|
static void laundromat_main(struct work_struct *);
|
|
static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
|
|
|
|
static void
|
|
laundromat_main(struct work_struct *not_used)
|
|
{
|
|
time_t t;
|
|
|
|
t = nfs4_laundromat();
|
|
dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
|
|
queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
|
|
}
|
|
|
|
static struct nfs4_stateowner *
|
|
search_close_lru(u32 st_id, int flags)
|
|
{
|
|
struct nfs4_stateowner *local = NULL;
|
|
|
|
if (flags & CLOSE_STATE) {
|
|
list_for_each_entry(local, &close_lru, so_close_lru) {
|
|
if (local->so_id == st_id)
|
|
return local;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static inline int
|
|
nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
|
|
{
|
|
return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
|
|
}
|
|
|
|
static int
|
|
STALE_STATEID(stateid_t *stateid)
|
|
{
|
|
if (time_after((unsigned long)boot_time,
|
|
(unsigned long)stateid->si_boot)) {
|
|
dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
|
|
stateid->si_boot, stateid->si_stateownerid,
|
|
stateid->si_fileid, stateid->si_generation);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
EXPIRED_STATEID(stateid_t *stateid)
|
|
{
|
|
if (time_before((unsigned long)boot_time,
|
|
((unsigned long)stateid->si_boot)) &&
|
|
time_before((unsigned long)(stateid->si_boot + lease_time), get_seconds())) {
|
|
dprintk("NFSD: expired stateid (%08x/%08x/%08x/%08x)!\n",
|
|
stateid->si_boot, stateid->si_stateownerid,
|
|
stateid->si_fileid, stateid->si_generation);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static __be32
|
|
stateid_error_map(stateid_t *stateid)
|
|
{
|
|
if (STALE_STATEID(stateid))
|
|
return nfserr_stale_stateid;
|
|
if (EXPIRED_STATEID(stateid))
|
|
return nfserr_expired;
|
|
|
|
dprintk("NFSD: bad stateid (%08x/%08x/%08x/%08x)!\n",
|
|
stateid->si_boot, stateid->si_stateownerid,
|
|
stateid->si_fileid, stateid->si_generation);
|
|
return nfserr_bad_stateid;
|
|
}
|
|
|
|
static inline int
|
|
access_permit_read(unsigned long access_bmap)
|
|
{
|
|
return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
|
|
test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
|
|
test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
|
|
}
|
|
|
|
static inline int
|
|
access_permit_write(unsigned long access_bmap)
|
|
{
|
|
return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
|
|
test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
|
|
}
|
|
|
|
static
|
|
__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
|
|
{
|
|
__be32 status = nfserr_openmode;
|
|
|
|
if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
|
|
goto out;
|
|
if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
|
|
goto out;
|
|
status = nfs_ok;
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static inline __be32
|
|
check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
|
|
{
|
|
if (ONE_STATEID(stateid) && (flags & RD_STATE))
|
|
return nfs_ok;
|
|
else if (locks_in_grace()) {
|
|
/* Answer in remaining cases depends on existance of
|
|
* conflicting state; so we must wait out the grace period. */
|
|
return nfserr_grace;
|
|
} else if (flags & WR_STATE)
|
|
return nfs4_share_conflict(current_fh,
|
|
NFS4_SHARE_DENY_WRITE);
|
|
else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
|
|
return nfs4_share_conflict(current_fh,
|
|
NFS4_SHARE_DENY_READ);
|
|
}
|
|
|
|
/*
|
|
* Allow READ/WRITE during grace period on recovered state only for files
|
|
* that are not able to provide mandatory locking.
|
|
*/
|
|
static inline int
|
|
grace_disallows_io(struct inode *inode)
|
|
{
|
|
return locks_in_grace() && mandatory_lock(inode);
|
|
}
|
|
|
|
static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags)
|
|
{
|
|
/*
|
|
* When sessions are used the stateid generation number is ignored
|
|
* when it is zero.
|
|
*/
|
|
if ((flags & HAS_SESSION) && in->si_generation == 0)
|
|
goto out;
|
|
|
|
/* If the client sends us a stateid from the future, it's buggy: */
|
|
if (in->si_generation > ref->si_generation)
|
|
return nfserr_bad_stateid;
|
|
/*
|
|
* The following, however, can happen. For example, if the
|
|
* client sends an open and some IO at the same time, the open
|
|
* may bump si_generation while the IO is still in flight.
|
|
* Thanks to hard links and renames, the client never knows what
|
|
* file an open will affect. So it could avoid that situation
|
|
* only by serializing all opens and IO from the same open
|
|
* owner. To recover from the old_stateid error, the client
|
|
* will just have to retry the IO:
|
|
*/
|
|
if (in->si_generation < ref->si_generation)
|
|
return nfserr_old_stateid;
|
|
out:
|
|
return nfs_ok;
|
|
}
|
|
|
|
static int is_delegation_stateid(stateid_t *stateid)
|
|
{
|
|
return stateid->si_fileid == 0;
|
|
}
|
|
|
|
/*
|
|
* Checks for stateid operations
|
|
*/
|
|
__be32
|
|
nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
|
|
stateid_t *stateid, int flags, struct file **filpp)
|
|
{
|
|
struct nfs4_stateid *stp = NULL;
|
|
struct nfs4_delegation *dp = NULL;
|
|
struct svc_fh *current_fh = &cstate->current_fh;
|
|
struct inode *ino = current_fh->fh_dentry->d_inode;
|
|
__be32 status;
|
|
|
|
if (filpp)
|
|
*filpp = NULL;
|
|
|
|
if (grace_disallows_io(ino))
|
|
return nfserr_grace;
|
|
|
|
if (nfsd4_has_session(cstate))
|
|
flags |= HAS_SESSION;
|
|
|
|
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
|
|
return check_special_stateids(current_fh, stateid, flags);
|
|
|
|
status = nfserr_stale_stateid;
|
|
if (STALE_STATEID(stateid))
|
|
goto out;
|
|
|
|
status = nfserr_bad_stateid;
|
|
if (is_delegation_stateid(stateid)) {
|
|
dp = find_delegation_stateid(ino, stateid);
|
|
if (!dp) {
|
|
status = stateid_error_map(stateid);
|
|
goto out;
|
|
}
|
|
status = check_stateid_generation(stateid, &dp->dl_stateid,
|
|
flags);
|
|
if (status)
|
|
goto out;
|
|
status = nfs4_check_delegmode(dp, flags);
|
|
if (status)
|
|
goto out;
|
|
renew_client(dp->dl_client);
|
|
if (filpp)
|
|
*filpp = dp->dl_vfs_file;
|
|
} else { /* open or lock stateid */
|
|
stp = find_stateid(stateid, flags);
|
|
if (!stp) {
|
|
status = stateid_error_map(stateid);
|
|
goto out;
|
|
}
|
|
if (nfs4_check_fh(current_fh, stp))
|
|
goto out;
|
|
if (!stp->st_stateowner->so_confirmed)
|
|
goto out;
|
|
status = check_stateid_generation(stateid, &stp->st_stateid,
|
|
flags);
|
|
if (status)
|
|
goto out;
|
|
status = nfs4_check_openmode(stp, flags);
|
|
if (status)
|
|
goto out;
|
|
renew_client(stp->st_stateowner->so_client);
|
|
if (filpp)
|
|
*filpp = stp->st_vfs_file;
|
|
}
|
|
status = nfs_ok;
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static inline int
|
|
setlkflg (int type)
|
|
{
|
|
return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
|
|
RD_STATE : WR_STATE;
|
|
}
|
|
|
|
/*
|
|
* Checks for sequence id mutating operations.
|
|
*/
|
|
static __be32
|
|
nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
|
|
stateid_t *stateid, int flags,
|
|
struct nfs4_stateowner **sopp,
|
|
struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
|
|
{
|
|
struct nfs4_stateid *stp;
|
|
struct nfs4_stateowner *sop;
|
|
struct svc_fh *current_fh = &cstate->current_fh;
|
|
__be32 status;
|
|
|
|
dprintk("NFSD: preprocess_seqid_op: seqid=%d "
|
|
"stateid = (%08x/%08x/%08x/%08x)\n", seqid,
|
|
stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
|
|
stateid->si_generation);
|
|
|
|
*stpp = NULL;
|
|
*sopp = NULL;
|
|
|
|
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
|
|
dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
|
|
return nfserr_bad_stateid;
|
|
}
|
|
|
|
if (STALE_STATEID(stateid))
|
|
return nfserr_stale_stateid;
|
|
|
|
if (nfsd4_has_session(cstate))
|
|
flags |= HAS_SESSION;
|
|
|
|
/*
|
|
* We return BAD_STATEID if filehandle doesn't match stateid,
|
|
* the confirmed flag is incorrecly set, or the generation
|
|
* number is incorrect.
|
|
*/
|
|
stp = find_stateid(stateid, flags);
|
|
if (stp == NULL) {
|
|
/*
|
|
* Also, we should make sure this isn't just the result of
|
|
* a replayed close:
|
|
*/
|
|
sop = search_close_lru(stateid->si_stateownerid, flags);
|
|
if (sop == NULL)
|
|
return stateid_error_map(stateid);
|
|
*sopp = sop;
|
|
goto check_replay;
|
|
}
|
|
|
|
*stpp = stp;
|
|
*sopp = sop = stp->st_stateowner;
|
|
|
|
if (lock) {
|
|
clientid_t *lockclid = &lock->v.new.clientid;
|
|
struct nfs4_client *clp = sop->so_client;
|
|
int lkflg = 0;
|
|
__be32 status;
|
|
|
|
lkflg = setlkflg(lock->lk_type);
|
|
|
|
if (lock->lk_is_new) {
|
|
if (!sop->so_is_open_owner)
|
|
return nfserr_bad_stateid;
|
|
if (!(flags & HAS_SESSION) &&
|
|
!same_clid(&clp->cl_clientid, lockclid))
|
|
return nfserr_bad_stateid;
|
|
/* stp is the open stateid */
|
|
status = nfs4_check_openmode(stp, lkflg);
|
|
if (status)
|
|
return status;
|
|
} else {
|
|
/* stp is the lock stateid */
|
|
status = nfs4_check_openmode(stp->st_openstp, lkflg);
|
|
if (status)
|
|
return status;
|
|
}
|
|
}
|
|
|
|
if (nfs4_check_fh(current_fh, stp)) {
|
|
dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
|
|
return nfserr_bad_stateid;
|
|
}
|
|
|
|
/*
|
|
* We now validate the seqid and stateid generation numbers.
|
|
* For the moment, we ignore the possibility of
|
|
* generation number wraparound.
|
|
*/
|
|
if (!(flags & HAS_SESSION) && seqid != sop->so_seqid)
|
|
goto check_replay;
|
|
|
|
if (sop->so_confirmed && flags & CONFIRM) {
|
|
dprintk("NFSD: preprocess_seqid_op: expected"
|
|
" unconfirmed stateowner!\n");
|
|
return nfserr_bad_stateid;
|
|
}
|
|
if (!sop->so_confirmed && !(flags & CONFIRM)) {
|
|
dprintk("NFSD: preprocess_seqid_op: stateowner not"
|
|
" confirmed yet!\n");
|
|
return nfserr_bad_stateid;
|
|
}
|
|
status = check_stateid_generation(stateid, &stp->st_stateid, flags);
|
|
if (status)
|
|
return status;
|
|
renew_client(sop->so_client);
|
|
return nfs_ok;
|
|
|
|
check_replay:
|
|
if (seqid == sop->so_seqid - 1) {
|
|
dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
|
|
/* indicate replay to calling function */
|
|
return nfserr_replay_me;
|
|
}
|
|
dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
|
|
sop->so_seqid, seqid);
|
|
*sopp = NULL;
|
|
return nfserr_bad_seqid;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_open_confirm *oc)
|
|
{
|
|
__be32 status;
|
|
struct nfs4_stateowner *sop;
|
|
struct nfs4_stateid *stp;
|
|
|
|
dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
|
|
(int)cstate->current_fh.fh_dentry->d_name.len,
|
|
cstate->current_fh.fh_dentry->d_name.name);
|
|
|
|
status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
|
|
if (status)
|
|
return status;
|
|
|
|
nfs4_lock_state();
|
|
|
|
if ((status = nfs4_preprocess_seqid_op(cstate,
|
|
oc->oc_seqid, &oc->oc_req_stateid,
|
|
CONFIRM | OPEN_STATE,
|
|
&oc->oc_stateowner, &stp, NULL)))
|
|
goto out;
|
|
|
|
sop = oc->oc_stateowner;
|
|
sop->so_confirmed = 1;
|
|
update_stateid(&stp->st_stateid);
|
|
memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
|
|
dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
|
|
"stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
|
|
stp->st_stateid.si_boot,
|
|
stp->st_stateid.si_stateownerid,
|
|
stp->st_stateid.si_fileid,
|
|
stp->st_stateid.si_generation);
|
|
|
|
nfsd4_create_clid_dir(sop->so_client);
|
|
out:
|
|
if (oc->oc_stateowner) {
|
|
nfs4_get_stateowner(oc->oc_stateowner);
|
|
cstate->replay_owner = oc->oc_stateowner;
|
|
}
|
|
nfs4_unlock_state();
|
|
return status;
|
|
}
|
|
|
|
|
|
/*
|
|
* unset all bits in union bitmap (bmap) that
|
|
* do not exist in share (from successful OPEN_DOWNGRADE)
|
|
*/
|
|
static void
|
|
reset_union_bmap_access(unsigned long access, unsigned long *bmap)
|
|
{
|
|
int i;
|
|
for (i = 1; i < 4; i++) {
|
|
if ((i & access) != i)
|
|
__clear_bit(i, bmap);
|
|
}
|
|
}
|
|
|
|
static void
|
|
reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
|
|
{
|
|
int i;
|
|
for (i = 0; i < 4; i++) {
|
|
if ((i & deny) != i)
|
|
__clear_bit(i, bmap);
|
|
}
|
|
}
|
|
|
|
__be32
|
|
nfsd4_open_downgrade(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_open_downgrade *od)
|
|
{
|
|
__be32 status;
|
|
struct nfs4_stateid *stp;
|
|
unsigned int share_access;
|
|
|
|
dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
|
|
(int)cstate->current_fh.fh_dentry->d_name.len,
|
|
cstate->current_fh.fh_dentry->d_name.name);
|
|
|
|
if (!access_valid(od->od_share_access, cstate->minorversion)
|
|
|| !deny_valid(od->od_share_deny))
|
|
return nfserr_inval;
|
|
|
|
nfs4_lock_state();
|
|
if ((status = nfs4_preprocess_seqid_op(cstate,
|
|
od->od_seqid,
|
|
&od->od_stateid,
|
|
OPEN_STATE,
|
|
&od->od_stateowner, &stp, NULL)))
|
|
goto out;
|
|
|
|
status = nfserr_inval;
|
|
if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
|
|
dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
|
|
stp->st_access_bmap, od->od_share_access);
|
|
goto out;
|
|
}
|
|
if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
|
|
dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
|
|
stp->st_deny_bmap, od->od_share_deny);
|
|
goto out;
|
|
}
|
|
set_access(&share_access, stp->st_access_bmap);
|
|
nfs4_file_downgrade(stp->st_vfs_file,
|
|
share_access & ~od->od_share_access);
|
|
|
|
reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
|
|
reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
|
|
|
|
update_stateid(&stp->st_stateid);
|
|
memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
|
|
status = nfs_ok;
|
|
out:
|
|
if (od->od_stateowner) {
|
|
nfs4_get_stateowner(od->od_stateowner);
|
|
cstate->replay_owner = od->od_stateowner;
|
|
}
|
|
nfs4_unlock_state();
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* nfs4_unlock_state() called after encode
|
|
*/
|
|
__be32
|
|
nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_close *close)
|
|
{
|
|
__be32 status;
|
|
struct nfs4_stateid *stp;
|
|
|
|
dprintk("NFSD: nfsd4_close on file %.*s\n",
|
|
(int)cstate->current_fh.fh_dentry->d_name.len,
|
|
cstate->current_fh.fh_dentry->d_name.name);
|
|
|
|
nfs4_lock_state();
|
|
/* check close_lru for replay */
|
|
if ((status = nfs4_preprocess_seqid_op(cstate,
|
|
close->cl_seqid,
|
|
&close->cl_stateid,
|
|
OPEN_STATE | CLOSE_STATE,
|
|
&close->cl_stateowner, &stp, NULL)))
|
|
goto out;
|
|
status = nfs_ok;
|
|
update_stateid(&stp->st_stateid);
|
|
memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
|
|
|
|
/* release_stateid() calls nfsd_close() if needed */
|
|
release_open_stateid(stp);
|
|
|
|
/* place unused nfs4_stateowners on so_close_lru list to be
|
|
* released by the laundromat service after the lease period
|
|
* to enable us to handle CLOSE replay
|
|
*/
|
|
if (list_empty(&close->cl_stateowner->so_stateids))
|
|
move_to_close_lru(close->cl_stateowner);
|
|
out:
|
|
if (close->cl_stateowner) {
|
|
nfs4_get_stateowner(close->cl_stateowner);
|
|
cstate->replay_owner = close->cl_stateowner;
|
|
}
|
|
nfs4_unlock_state();
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_delegreturn *dr)
|
|
{
|
|
struct nfs4_delegation *dp;
|
|
stateid_t *stateid = &dr->dr_stateid;
|
|
struct inode *inode;
|
|
__be32 status;
|
|
int flags = 0;
|
|
|
|
if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
|
|
return status;
|
|
inode = cstate->current_fh.fh_dentry->d_inode;
|
|
|
|
if (nfsd4_has_session(cstate))
|
|
flags |= HAS_SESSION;
|
|
nfs4_lock_state();
|
|
status = nfserr_bad_stateid;
|
|
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
|
|
goto out;
|
|
status = nfserr_stale_stateid;
|
|
if (STALE_STATEID(stateid))
|
|
goto out;
|
|
status = nfserr_bad_stateid;
|
|
if (!is_delegation_stateid(stateid))
|
|
goto out;
|
|
dp = find_delegation_stateid(inode, stateid);
|
|
if (!dp) {
|
|
status = stateid_error_map(stateid);
|
|
goto out;
|
|
}
|
|
status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
|
|
if (status)
|
|
goto out;
|
|
renew_client(dp->dl_client);
|
|
|
|
unhash_delegation(dp);
|
|
out:
|
|
nfs4_unlock_state();
|
|
|
|
return status;
|
|
}
|
|
|
|
|
|
/*
|
|
* Lock owner state (byte-range locks)
|
|
*/
|
|
#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
|
|
#define LOCK_HASH_BITS 8
|
|
#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
|
|
#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
|
|
|
|
static inline u64
|
|
end_offset(u64 start, u64 len)
|
|
{
|
|
u64 end;
|
|
|
|
end = start + len;
|
|
return end >= start ? end: NFS4_MAX_UINT64;
|
|
}
|
|
|
|
/* last octet in a range */
|
|
static inline u64
|
|
last_byte_offset(u64 start, u64 len)
|
|
{
|
|
u64 end;
|
|
|
|
BUG_ON(!len);
|
|
end = start + len;
|
|
return end > start ? end - 1: NFS4_MAX_UINT64;
|
|
}
|
|
|
|
#define lockownerid_hashval(id) \
|
|
((id) & LOCK_HASH_MASK)
|
|
|
|
static inline unsigned int
|
|
lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
|
|
struct xdr_netobj *ownername)
|
|
{
|
|
return (file_hashval(inode) + cl_id
|
|
+ opaque_hashval(ownername->data, ownername->len))
|
|
& LOCK_HASH_MASK;
|
|
}
|
|
|
|
static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
|
|
static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
|
|
static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
|
|
|
|
static struct nfs4_stateid *
|
|
find_stateid(stateid_t *stid, int flags)
|
|
{
|
|
struct nfs4_stateid *local;
|
|
u32 st_id = stid->si_stateownerid;
|
|
u32 f_id = stid->si_fileid;
|
|
unsigned int hashval;
|
|
|
|
dprintk("NFSD: find_stateid flags 0x%x\n",flags);
|
|
if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
|
|
hashval = stateid_hashval(st_id, f_id);
|
|
list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
|
|
if ((local->st_stateid.si_stateownerid == st_id) &&
|
|
(local->st_stateid.si_fileid == f_id))
|
|
return local;
|
|
}
|
|
}
|
|
|
|
if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
|
|
hashval = stateid_hashval(st_id, f_id);
|
|
list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
|
|
if ((local->st_stateid.si_stateownerid == st_id) &&
|
|
(local->st_stateid.si_fileid == f_id))
|
|
return local;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfs4_delegation *
|
|
find_delegation_stateid(struct inode *ino, stateid_t *stid)
|
|
{
|
|
struct nfs4_file *fp;
|
|
struct nfs4_delegation *dl;
|
|
|
|
dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
|
|
stid->si_boot, stid->si_stateownerid,
|
|
stid->si_fileid, stid->si_generation);
|
|
|
|
fp = find_file(ino);
|
|
if (!fp)
|
|
return NULL;
|
|
dl = find_delegation_file(fp, stid);
|
|
put_nfs4_file(fp);
|
|
return dl;
|
|
}
|
|
|
|
/*
|
|
* TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
|
|
* we can't properly handle lock requests that go beyond the (2^63 - 1)-th
|
|
* byte, because of sign extension problems. Since NFSv4 calls for 64-bit
|
|
* locking, this prevents us from being completely protocol-compliant. The
|
|
* real solution to this problem is to start using unsigned file offsets in
|
|
* the VFS, but this is a very deep change!
|
|
*/
|
|
static inline void
|
|
nfs4_transform_lock_offset(struct file_lock *lock)
|
|
{
|
|
if (lock->fl_start < 0)
|
|
lock->fl_start = OFFSET_MAX;
|
|
if (lock->fl_end < 0)
|
|
lock->fl_end = OFFSET_MAX;
|
|
}
|
|
|
|
/* Hack!: For now, we're defining this just so we can use a pointer to it
|
|
* as a unique cookie to identify our (NFSv4's) posix locks. */
|
|
static const struct lock_manager_operations nfsd_posix_mng_ops = {
|
|
};
|
|
|
|
static inline void
|
|
nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
|
|
{
|
|
struct nfs4_stateowner *sop;
|
|
unsigned int hval;
|
|
|
|
if (fl->fl_lmops == &nfsd_posix_mng_ops) {
|
|
sop = (struct nfs4_stateowner *) fl->fl_owner;
|
|
hval = lockownerid_hashval(sop->so_id);
|
|
kref_get(&sop->so_ref);
|
|
deny->ld_sop = sop;
|
|
deny->ld_clientid = sop->so_client->cl_clientid;
|
|
} else {
|
|
deny->ld_sop = NULL;
|
|
deny->ld_clientid.cl_boot = 0;
|
|
deny->ld_clientid.cl_id = 0;
|
|
}
|
|
deny->ld_start = fl->fl_start;
|
|
deny->ld_length = NFS4_MAX_UINT64;
|
|
if (fl->fl_end != NFS4_MAX_UINT64)
|
|
deny->ld_length = fl->fl_end - fl->fl_start + 1;
|
|
deny->ld_type = NFS4_READ_LT;
|
|
if (fl->fl_type != F_RDLCK)
|
|
deny->ld_type = NFS4_WRITE_LT;
|
|
}
|
|
|
|
static struct nfs4_stateowner *
|
|
find_lockstateowner_str(struct inode *inode, clientid_t *clid,
|
|
struct xdr_netobj *owner)
|
|
{
|
|
unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
|
|
struct nfs4_stateowner *op;
|
|
|
|
list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
|
|
if (same_owner_str(op, owner, clid))
|
|
return op;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Alloc a lock owner structure.
|
|
* Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
|
|
* occured.
|
|
*
|
|
* strhashval = lock_ownerstr_hashval
|
|
*/
|
|
|
|
static struct nfs4_stateowner *
|
|
alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
|
|
struct nfs4_stateowner *sop;
|
|
struct nfs4_replay *rp;
|
|
unsigned int idhashval;
|
|
|
|
if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
|
|
return NULL;
|
|
idhashval = lockownerid_hashval(current_ownerid);
|
|
INIT_LIST_HEAD(&sop->so_idhash);
|
|
INIT_LIST_HEAD(&sop->so_strhash);
|
|
INIT_LIST_HEAD(&sop->so_perclient);
|
|
INIT_LIST_HEAD(&sop->so_stateids);
|
|
INIT_LIST_HEAD(&sop->so_perstateid);
|
|
INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
|
|
sop->so_time = 0;
|
|
list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
|
|
list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
|
|
list_add(&sop->so_perstateid, &open_stp->st_lockowners);
|
|
sop->so_is_open_owner = 0;
|
|
sop->so_id = current_ownerid++;
|
|
sop->so_client = clp;
|
|
/* It is the openowner seqid that will be incremented in encode in the
|
|
* case of new lockowners; so increment the lock seqid manually: */
|
|
sop->so_seqid = lock->lk_new_lock_seqid + 1;
|
|
sop->so_confirmed = 1;
|
|
rp = &sop->so_replay;
|
|
rp->rp_status = nfserr_serverfault;
|
|
rp->rp_buflen = 0;
|
|
rp->rp_buf = rp->rp_ibuf;
|
|
return sop;
|
|
}
|
|
|
|
static struct nfs4_stateid *
|
|
alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
|
|
{
|
|
struct nfs4_stateid *stp;
|
|
unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
|
|
|
|
stp = nfs4_alloc_stateid();
|
|
if (stp == NULL)
|
|
goto out;
|
|
INIT_LIST_HEAD(&stp->st_hash);
|
|
INIT_LIST_HEAD(&stp->st_perfile);
|
|
INIT_LIST_HEAD(&stp->st_perstateowner);
|
|
INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
|
|
list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
|
|
list_add(&stp->st_perfile, &fp->fi_stateids);
|
|
list_add(&stp->st_perstateowner, &sop->so_stateids);
|
|
stp->st_stateowner = sop;
|
|
get_nfs4_file(fp);
|
|
stp->st_file = fp;
|
|
stp->st_stateid.si_boot = get_seconds();
|
|
stp->st_stateid.si_stateownerid = sop->so_id;
|
|
stp->st_stateid.si_fileid = fp->fi_id;
|
|
stp->st_stateid.si_generation = 0;
|
|
stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
|
|
stp->st_access_bmap = open_stp->st_access_bmap;
|
|
stp->st_deny_bmap = open_stp->st_deny_bmap;
|
|
stp->st_openstp = open_stp;
|
|
|
|
out:
|
|
return stp;
|
|
}
|
|
|
|
static int
|
|
check_lock_length(u64 offset, u64 length)
|
|
{
|
|
return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
|
|
LOFF_OVERFLOW(offset, length)));
|
|
}
|
|
|
|
/*
|
|
* LOCK operation
|
|
*/
|
|
__be32
|
|
nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_lock *lock)
|
|
{
|
|
struct nfs4_stateowner *open_sop = NULL;
|
|
struct nfs4_stateowner *lock_sop = NULL;
|
|
struct nfs4_stateid *lock_stp;
|
|
struct file *filp;
|
|
struct file_lock file_lock;
|
|
struct file_lock conflock;
|
|
__be32 status = 0;
|
|
unsigned int strhashval;
|
|
unsigned int cmd;
|
|
int err;
|
|
|
|
dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
|
|
(long long) lock->lk_offset,
|
|
(long long) lock->lk_length);
|
|
|
|
if (check_lock_length(lock->lk_offset, lock->lk_length))
|
|
return nfserr_inval;
|
|
|
|
if ((status = fh_verify(rqstp, &cstate->current_fh,
|
|
S_IFREG, NFSD_MAY_LOCK))) {
|
|
dprintk("NFSD: nfsd4_lock: permission denied!\n");
|
|
return status;
|
|
}
|
|
|
|
nfs4_lock_state();
|
|
|
|
if (lock->lk_is_new) {
|
|
/*
|
|
* Client indicates that this is a new lockowner.
|
|
* Use open owner and open stateid to create lock owner and
|
|
* lock stateid.
|
|
*/
|
|
struct nfs4_stateid *open_stp = NULL;
|
|
struct nfs4_file *fp;
|
|
|
|
status = nfserr_stale_clientid;
|
|
if (!nfsd4_has_session(cstate) &&
|
|
STALE_CLIENTID(&lock->lk_new_clientid))
|
|
goto out;
|
|
|
|
/* validate and update open stateid and open seqid */
|
|
status = nfs4_preprocess_seqid_op(cstate,
|
|
lock->lk_new_open_seqid,
|
|
&lock->lk_new_open_stateid,
|
|
OPEN_STATE,
|
|
&lock->lk_replay_owner, &open_stp,
|
|
lock);
|
|
if (status)
|
|
goto out;
|
|
open_sop = lock->lk_replay_owner;
|
|
/* create lockowner and lock stateid */
|
|
fp = open_stp->st_file;
|
|
strhashval = lock_ownerstr_hashval(fp->fi_inode,
|
|
open_sop->so_client->cl_clientid.cl_id,
|
|
&lock->v.new.owner);
|
|
/* XXX: Do we need to check for duplicate stateowners on
|
|
* the same file, or should they just be allowed (and
|
|
* create new stateids)? */
|
|
status = nfserr_resource;
|
|
lock_sop = alloc_init_lock_stateowner(strhashval,
|
|
open_sop->so_client, open_stp, lock);
|
|
if (lock_sop == NULL)
|
|
goto out;
|
|
lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
|
|
if (lock_stp == NULL)
|
|
goto out;
|
|
} else {
|
|
/* lock (lock owner + lock stateid) already exists */
|
|
status = nfs4_preprocess_seqid_op(cstate,
|
|
lock->lk_old_lock_seqid,
|
|
&lock->lk_old_lock_stateid,
|
|
LOCK_STATE,
|
|
&lock->lk_replay_owner, &lock_stp, lock);
|
|
if (status)
|
|
goto out;
|
|
lock_sop = lock->lk_replay_owner;
|
|
}
|
|
/* lock->lk_replay_owner and lock_stp have been created or found */
|
|
filp = lock_stp->st_vfs_file;
|
|
|
|
status = nfserr_grace;
|
|
if (locks_in_grace() && !lock->lk_reclaim)
|
|
goto out;
|
|
status = nfserr_no_grace;
|
|
if (!locks_in_grace() && lock->lk_reclaim)
|
|
goto out;
|
|
|
|
locks_init_lock(&file_lock);
|
|
switch (lock->lk_type) {
|
|
case NFS4_READ_LT:
|
|
case NFS4_READW_LT:
|
|
file_lock.fl_type = F_RDLCK;
|
|
cmd = F_SETLK;
|
|
break;
|
|
case NFS4_WRITE_LT:
|
|
case NFS4_WRITEW_LT:
|
|
file_lock.fl_type = F_WRLCK;
|
|
cmd = F_SETLK;
|
|
break;
|
|
default:
|
|
status = nfserr_inval;
|
|
goto out;
|
|
}
|
|
file_lock.fl_owner = (fl_owner_t)lock_sop;
|
|
file_lock.fl_pid = current->tgid;
|
|
file_lock.fl_file = filp;
|
|
file_lock.fl_flags = FL_POSIX;
|
|
file_lock.fl_lmops = &nfsd_posix_mng_ops;
|
|
|
|
file_lock.fl_start = lock->lk_offset;
|
|
file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
|
|
nfs4_transform_lock_offset(&file_lock);
|
|
|
|
/*
|
|
* Try to lock the file in the VFS.
|
|
* Note: locks.c uses the BKL to protect the inode's lock list.
|
|
*/
|
|
|
|
err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
|
|
switch (-err) {
|
|
case 0: /* success! */
|
|
update_stateid(&lock_stp->st_stateid);
|
|
memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
|
|
sizeof(stateid_t));
|
|
status = 0;
|
|
break;
|
|
case (EAGAIN): /* conflock holds conflicting lock */
|
|
status = nfserr_denied;
|
|
dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
|
|
nfs4_set_lock_denied(&conflock, &lock->lk_denied);
|
|
break;
|
|
case (EDEADLK):
|
|
status = nfserr_deadlock;
|
|
break;
|
|
default:
|
|
dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
|
|
status = nfserr_resource;
|
|
break;
|
|
}
|
|
out:
|
|
if (status && lock->lk_is_new && lock_sop)
|
|
release_lockowner(lock_sop);
|
|
if (lock->lk_replay_owner) {
|
|
nfs4_get_stateowner(lock->lk_replay_owner);
|
|
cstate->replay_owner = lock->lk_replay_owner;
|
|
}
|
|
nfs4_unlock_state();
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
|
|
* so we do a temporary open here just to get an open file to pass to
|
|
* vfs_test_lock. (Arguably perhaps test_lock should be done with an
|
|
* inode operation.)
|
|
*/
|
|
static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
|
|
{
|
|
struct file *file;
|
|
int err;
|
|
|
|
err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
|
|
if (err)
|
|
return err;
|
|
err = vfs_test_lock(file, lock);
|
|
nfsd_close(file);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* LOCKT operation
|
|
*/
|
|
__be32
|
|
nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_lockt *lockt)
|
|
{
|
|
struct inode *inode;
|
|
struct file_lock file_lock;
|
|
int error;
|
|
__be32 status;
|
|
|
|
if (locks_in_grace())
|
|
return nfserr_grace;
|
|
|
|
if (check_lock_length(lockt->lt_offset, lockt->lt_length))
|
|
return nfserr_inval;
|
|
|
|
lockt->lt_stateowner = NULL;
|
|
nfs4_lock_state();
|
|
|
|
status = nfserr_stale_clientid;
|
|
if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
|
|
goto out;
|
|
|
|
if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
|
|
dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
|
|
if (status == nfserr_symlink)
|
|
status = nfserr_inval;
|
|
goto out;
|
|
}
|
|
|
|
inode = cstate->current_fh.fh_dentry->d_inode;
|
|
locks_init_lock(&file_lock);
|
|
switch (lockt->lt_type) {
|
|
case NFS4_READ_LT:
|
|
case NFS4_READW_LT:
|
|
file_lock.fl_type = F_RDLCK;
|
|
break;
|
|
case NFS4_WRITE_LT:
|
|
case NFS4_WRITEW_LT:
|
|
file_lock.fl_type = F_WRLCK;
|
|
break;
|
|
default:
|
|
dprintk("NFSD: nfs4_lockt: bad lock type!\n");
|
|
status = nfserr_inval;
|
|
goto out;
|
|
}
|
|
|
|
lockt->lt_stateowner = find_lockstateowner_str(inode,
|
|
&lockt->lt_clientid, &lockt->lt_owner);
|
|
if (lockt->lt_stateowner)
|
|
file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
|
|
file_lock.fl_pid = current->tgid;
|
|
file_lock.fl_flags = FL_POSIX;
|
|
|
|
file_lock.fl_start = lockt->lt_offset;
|
|
file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
|
|
|
|
nfs4_transform_lock_offset(&file_lock);
|
|
|
|
status = nfs_ok;
|
|
error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
|
|
if (error) {
|
|
status = nfserrno(error);
|
|
goto out;
|
|
}
|
|
if (file_lock.fl_type != F_UNLCK) {
|
|
status = nfserr_denied;
|
|
nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
|
|
}
|
|
out:
|
|
nfs4_unlock_state();
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_locku *locku)
|
|
{
|
|
struct nfs4_stateid *stp;
|
|
struct file *filp = NULL;
|
|
struct file_lock file_lock;
|
|
__be32 status;
|
|
int err;
|
|
|
|
dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
|
|
(long long) locku->lu_offset,
|
|
(long long) locku->lu_length);
|
|
|
|
if (check_lock_length(locku->lu_offset, locku->lu_length))
|
|
return nfserr_inval;
|
|
|
|
nfs4_lock_state();
|
|
|
|
if ((status = nfs4_preprocess_seqid_op(cstate,
|
|
locku->lu_seqid,
|
|
&locku->lu_stateid,
|
|
LOCK_STATE,
|
|
&locku->lu_stateowner, &stp, NULL)))
|
|
goto out;
|
|
|
|
filp = stp->st_vfs_file;
|
|
BUG_ON(!filp);
|
|
locks_init_lock(&file_lock);
|
|
file_lock.fl_type = F_UNLCK;
|
|
file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
|
|
file_lock.fl_pid = current->tgid;
|
|
file_lock.fl_file = filp;
|
|
file_lock.fl_flags = FL_POSIX;
|
|
file_lock.fl_lmops = &nfsd_posix_mng_ops;
|
|
file_lock.fl_start = locku->lu_offset;
|
|
|
|
file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
|
|
nfs4_transform_lock_offset(&file_lock);
|
|
|
|
/*
|
|
* Try to unlock the file in the VFS.
|
|
*/
|
|
err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
|
|
if (err) {
|
|
dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
|
|
goto out_nfserr;
|
|
}
|
|
/*
|
|
* OK, unlock succeeded; the only thing left to do is update the stateid.
|
|
*/
|
|
update_stateid(&stp->st_stateid);
|
|
memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
|
|
|
|
out:
|
|
if (locku->lu_stateowner) {
|
|
nfs4_get_stateowner(locku->lu_stateowner);
|
|
cstate->replay_owner = locku->lu_stateowner;
|
|
}
|
|
nfs4_unlock_state();
|
|
return status;
|
|
|
|
out_nfserr:
|
|
status = nfserrno(err);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* returns
|
|
* 1: locks held by lockowner
|
|
* 0: no locks held by lockowner
|
|
*/
|
|
static int
|
|
check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
|
|
{
|
|
struct file_lock **flpp;
|
|
struct inode *inode = filp->f_path.dentry->d_inode;
|
|
int status = 0;
|
|
|
|
lock_kernel();
|
|
for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
|
|
if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
|
|
status = 1;
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
unlock_kernel();
|
|
return status;
|
|
}
|
|
|
|
__be32
|
|
nfsd4_release_lockowner(struct svc_rqst *rqstp,
|
|
struct nfsd4_compound_state *cstate,
|
|
struct nfsd4_release_lockowner *rlockowner)
|
|
{
|
|
clientid_t *clid = &rlockowner->rl_clientid;
|
|
struct nfs4_stateowner *sop;
|
|
struct nfs4_stateid *stp;
|
|
struct xdr_netobj *owner = &rlockowner->rl_owner;
|
|
struct list_head matches;
|
|
int i;
|
|
__be32 status;
|
|
|
|
dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
|
|
clid->cl_boot, clid->cl_id);
|
|
|
|
/* XXX check for lease expiration */
|
|
|
|
status = nfserr_stale_clientid;
|
|
if (STALE_CLIENTID(clid))
|
|
return status;
|
|
|
|
nfs4_lock_state();
|
|
|
|
status = nfserr_locks_held;
|
|
/* XXX: we're doing a linear search through all the lockowners.
|
|
* Yipes! For now we'll just hope clients aren't really using
|
|
* release_lockowner much, but eventually we have to fix these
|
|
* data structures. */
|
|
INIT_LIST_HEAD(&matches);
|
|
for (i = 0; i < LOCK_HASH_SIZE; i++) {
|
|
list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
|
|
if (!same_owner_str(sop, owner, clid))
|
|
continue;
|
|
list_for_each_entry(stp, &sop->so_stateids,
|
|
st_perstateowner) {
|
|
if (check_for_locks(stp->st_vfs_file, sop))
|
|
goto out;
|
|
/* Note: so_perclient unused for lockowners,
|
|
* so it's OK to fool with here. */
|
|
list_add(&sop->so_perclient, &matches);
|
|
}
|
|
}
|
|
}
|
|
/* Clients probably won't expect us to return with some (but not all)
|
|
* of the lockowner state released; so don't release any until all
|
|
* have been checked. */
|
|
status = nfs_ok;
|
|
while (!list_empty(&matches)) {
|
|
sop = list_entry(matches.next, struct nfs4_stateowner,
|
|
so_perclient);
|
|
/* unhash_stateowner deletes so_perclient only
|
|
* for openowners. */
|
|
list_del(&sop->so_perclient);
|
|
release_lockowner(sop);
|
|
}
|
|
out:
|
|
nfs4_unlock_state();
|
|
return status;
|
|
}
|
|
|
|
static inline struct nfs4_client_reclaim *
|
|
alloc_reclaim(void)
|
|
{
|
|
return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
|
|
}
|
|
|
|
int
|
|
nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
|
|
{
|
|
unsigned int strhashval = clientstr_hashval(name);
|
|
struct nfs4_client *clp;
|
|
|
|
clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
|
|
return clp ? 1 : 0;
|
|
}
|
|
|
|
/*
|
|
* failure => all reset bets are off, nfserr_no_grace...
|
|
*/
|
|
int
|
|
nfs4_client_to_reclaim(const char *name)
|
|
{
|
|
unsigned int strhashval;
|
|
struct nfs4_client_reclaim *crp = NULL;
|
|
|
|
dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
|
|
crp = alloc_reclaim();
|
|
if (!crp)
|
|
return 0;
|
|
strhashval = clientstr_hashval(name);
|
|
INIT_LIST_HEAD(&crp->cr_strhash);
|
|
list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
|
|
memcpy(crp->cr_recdir, name, HEXDIR_LEN);
|
|
reclaim_str_hashtbl_size++;
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
nfs4_release_reclaim(void)
|
|
{
|
|
struct nfs4_client_reclaim *crp = NULL;
|
|
int i;
|
|
|
|
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
|
|
while (!list_empty(&reclaim_str_hashtbl[i])) {
|
|
crp = list_entry(reclaim_str_hashtbl[i].next,
|
|
struct nfs4_client_reclaim, cr_strhash);
|
|
list_del(&crp->cr_strhash);
|
|
kfree(crp);
|
|
reclaim_str_hashtbl_size--;
|
|
}
|
|
}
|
|
BUG_ON(reclaim_str_hashtbl_size);
|
|
}
|
|
|
|
/*
|
|
* called from OPEN, CLAIM_PREVIOUS with a new clientid. */
|
|
static struct nfs4_client_reclaim *
|
|
nfs4_find_reclaim_client(clientid_t *clid)
|
|
{
|
|
unsigned int strhashval;
|
|
struct nfs4_client *clp;
|
|
struct nfs4_client_reclaim *crp = NULL;
|
|
|
|
|
|
/* find clientid in conf_id_hashtbl */
|
|
clp = find_confirmed_client(clid);
|
|
if (clp == NULL)
|
|
return NULL;
|
|
|
|
dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
|
|
clp->cl_name.len, clp->cl_name.data,
|
|
clp->cl_recdir);
|
|
|
|
/* find clp->cl_name in reclaim_str_hashtbl */
|
|
strhashval = clientstr_hashval(clp->cl_recdir);
|
|
list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
|
|
if (same_name(crp->cr_recdir, clp->cl_recdir)) {
|
|
return crp;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Called from OPEN. Look for clientid in reclaim list.
|
|
*/
|
|
__be32
|
|
nfs4_check_open_reclaim(clientid_t *clid)
|
|
{
|
|
return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
|
|
}
|
|
|
|
/* initialization to perform at module load time: */
|
|
|
|
int
|
|
nfs4_state_init(void)
|
|
{
|
|
int i, status;
|
|
|
|
status = nfsd4_init_slabs();
|
|
if (status)
|
|
return status;
|
|
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
|
|
INIT_LIST_HEAD(&conf_id_hashtbl[i]);
|
|
INIT_LIST_HEAD(&conf_str_hashtbl[i]);
|
|
INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
|
|
INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
|
|
INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
|
|
}
|
|
for (i = 0; i < SESSION_HASH_SIZE; i++)
|
|
INIT_LIST_HEAD(&sessionid_hashtbl[i]);
|
|
for (i = 0; i < FILE_HASH_SIZE; i++) {
|
|
INIT_LIST_HEAD(&file_hashtbl[i]);
|
|
}
|
|
for (i = 0; i < OWNER_HASH_SIZE; i++) {
|
|
INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
|
|
INIT_LIST_HEAD(&ownerid_hashtbl[i]);
|
|
}
|
|
for (i = 0; i < STATEID_HASH_SIZE; i++) {
|
|
INIT_LIST_HEAD(&stateid_hashtbl[i]);
|
|
INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
|
|
}
|
|
for (i = 0; i < LOCK_HASH_SIZE; i++) {
|
|
INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
|
|
INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
|
|
}
|
|
memset(&onestateid, ~0, sizeof(stateid_t));
|
|
INIT_LIST_HEAD(&close_lru);
|
|
INIT_LIST_HEAD(&client_lru);
|
|
INIT_LIST_HEAD(&del_recall_lru);
|
|
reclaim_str_hashtbl_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
nfsd4_load_reboot_recovery_data(void)
|
|
{
|
|
int status;
|
|
|
|
nfs4_lock_state();
|
|
nfsd4_init_recdir(user_recovery_dirname);
|
|
status = nfsd4_recdir_load();
|
|
nfs4_unlock_state();
|
|
if (status)
|
|
printk("NFSD: Failure reading reboot recovery data\n");
|
|
}
|
|
|
|
unsigned long
|
|
get_nfs4_grace_period(void)
|
|
{
|
|
return max(user_lease_time, lease_time) * HZ;
|
|
}
|
|
|
|
/*
|
|
* Since the lifetime of a delegation isn't limited to that of an open, a
|
|
* client may quite reasonably hang on to a delegation as long as it has
|
|
* the inode cached. This becomes an obvious problem the first time a
|
|
* client's inode cache approaches the size of the server's total memory.
|
|
*
|
|
* For now we avoid this problem by imposing a hard limit on the number
|
|
* of delegations, which varies according to the server's memory size.
|
|
*/
|
|
static void
|
|
set_max_delegations(void)
|
|
{
|
|
/*
|
|
* Allow at most 4 delegations per megabyte of RAM. Quick
|
|
* estimates suggest that in the worst case (where every delegation
|
|
* is for a different inode), a delegation could take about 1.5K,
|
|
* giving a worst case usage of about 6% of memory.
|
|
*/
|
|
max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
|
|
}
|
|
|
|
/* initialization to perform when the nfsd service is started: */
|
|
|
|
static int
|
|
__nfs4_state_start(void)
|
|
{
|
|
unsigned long grace_time;
|
|
|
|
boot_time = get_seconds();
|
|
grace_time = get_nfs4_grace_period();
|
|
lease_time = user_lease_time;
|
|
locks_start_grace(&nfsd4_manager);
|
|
printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
|
|
grace_time/HZ);
|
|
laundry_wq = create_singlethread_workqueue("nfsd4");
|
|
if (laundry_wq == NULL)
|
|
return -ENOMEM;
|
|
queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
|
|
set_max_delegations();
|
|
return set_callback_cred();
|
|
}
|
|
|
|
int
|
|
nfs4_state_start(void)
|
|
{
|
|
int ret;
|
|
|
|
if (nfs4_init)
|
|
return 0;
|
|
nfsd4_load_reboot_recovery_data();
|
|
ret = __nfs4_state_start();
|
|
if (ret)
|
|
return ret;
|
|
nfs4_init = 1;
|
|
return 0;
|
|
}
|
|
|
|
time_t
|
|
nfs4_lease_time(void)
|
|
{
|
|
return lease_time;
|
|
}
|
|
|
|
static void
|
|
__nfs4_state_shutdown(void)
|
|
{
|
|
int i;
|
|
struct nfs4_client *clp = NULL;
|
|
struct nfs4_delegation *dp = NULL;
|
|
struct list_head *pos, *next, reaplist;
|
|
|
|
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
|
|
while (!list_empty(&conf_id_hashtbl[i])) {
|
|
clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
|
|
expire_client(clp);
|
|
}
|
|
while (!list_empty(&unconf_str_hashtbl[i])) {
|
|
clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
|
|
expire_client(clp);
|
|
}
|
|
}
|
|
INIT_LIST_HEAD(&reaplist);
|
|
spin_lock(&recall_lock);
|
|
list_for_each_safe(pos, next, &del_recall_lru) {
|
|
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
|
|
list_move(&dp->dl_recall_lru, &reaplist);
|
|
}
|
|
spin_unlock(&recall_lock);
|
|
list_for_each_safe(pos, next, &reaplist) {
|
|
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
|
|
list_del_init(&dp->dl_recall_lru);
|
|
unhash_delegation(dp);
|
|
}
|
|
|
|
nfsd4_shutdown_recdir();
|
|
nfs4_init = 0;
|
|
}
|
|
|
|
void
|
|
nfs4_state_shutdown(void)
|
|
{
|
|
cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
|
|
destroy_workqueue(laundry_wq);
|
|
locks_end_grace(&nfsd4_manager);
|
|
nfs4_lock_state();
|
|
nfs4_release_reclaim();
|
|
__nfs4_state_shutdown();
|
|
nfs4_unlock_state();
|
|
}
|
|
|
|
/*
|
|
* user_recovery_dirname is protected by the nfsd_mutex since it's only
|
|
* accessed when nfsd is starting.
|
|
*/
|
|
static void
|
|
nfs4_set_recdir(char *recdir)
|
|
{
|
|
strcpy(user_recovery_dirname, recdir);
|
|
}
|
|
|
|
/*
|
|
* Change the NFSv4 recovery directory to recdir.
|
|
*/
|
|
int
|
|
nfs4_reset_recoverydir(char *recdir)
|
|
{
|
|
int status;
|
|
struct path path;
|
|
|
|
status = kern_path(recdir, LOOKUP_FOLLOW, &path);
|
|
if (status)
|
|
return status;
|
|
status = -ENOTDIR;
|
|
if (S_ISDIR(path.dentry->d_inode->i_mode)) {
|
|
nfs4_set_recdir(recdir);
|
|
status = 0;
|
|
}
|
|
path_put(&path);
|
|
return status;
|
|
}
|
|
|
|
char *
|
|
nfs4_recoverydir(void)
|
|
{
|
|
return user_recovery_dirname;
|
|
}
|
|
|
|
/*
|
|
* Called when leasetime is changed.
|
|
*
|
|
* The only way the protocol gives us to handle on-the-fly lease changes is to
|
|
* simulate a reboot. Instead of doing that, we just wait till the next time
|
|
* we start to register any changes in lease time. If the administrator
|
|
* really wants to change the lease time *now*, they can go ahead and bring
|
|
* nfsd down and then back up again after changing the lease time.
|
|
*
|
|
* user_lease_time is protected by nfsd_mutex since it's only really accessed
|
|
* when nfsd is starting
|
|
*/
|
|
void
|
|
nfs4_reset_lease(time_t leasetime)
|
|
{
|
|
user_lease_time = leasetime;
|
|
}
|