| /* |
| * linux/fs/nfsd/nfs4state.c |
| * |
| * Copyright (c) 2001 The Regents of the University of Michigan. |
| * All rights reserved. |
| * |
| * Kendrick Smith <kmsmith@umich.edu> |
| * Andy Adamson <kandros@umich.edu> |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include <linux/param.h> |
| #include <linux/major.h> |
| #include <linux/slab.h> |
| |
| #include <linux/sunrpc/svc.h> |
| #include <linux/nfsd/nfsd.h> |
| #include <linux/nfsd/cache.h> |
| #include <linux/mount.h> |
| #include <linux/workqueue.h> |
| #include <linux/smp_lock.h> |
| #include <linux/kthread.h> |
| #include <linux/nfs4.h> |
| #include <linux/nfsd/state.h> |
| #include <linux/nfsd/xdr4.h> |
| #include <linux/namei.h> |
| #include <linux/mutex.h> |
| |
| #define NFSDDBG_FACILITY NFSDDBG_PROC |
| |
| /* Globals */ |
| static time_t lease_time = 90; /* default lease time */ |
| static time_t user_lease_time = 90; |
| static time_t boot_time; |
| static int in_grace = 1; |
| static u32 current_clientid = 1; |
| static u32 current_ownerid = 1; |
| static u32 current_fileid = 1; |
| static u32 current_delegid = 1; |
| static u32 nfs4_init; |
| static stateid_t zerostateid; /* bits all 0 */ |
| static stateid_t onestateid; /* bits all 1 */ |
| |
| #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t))) |
| #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t))) |
| |
| /* forward declarations */ |
| static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags); |
| static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid); |
| static void release_stateid_lockowners(struct nfs4_stateid *open_stp); |
| static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; |
| static void nfs4_set_recdir(char *recdir); |
| |
| /* Locking: |
| * |
| * client_mutex: |
| * protects clientid_hashtbl[], clientstr_hashtbl[], |
| * unconfstr_hashtbl[], uncofid_hashtbl[]. |
| */ |
| static DEFINE_MUTEX(client_mutex); |
| |
| static kmem_cache_t *stateowner_slab = NULL; |
| static kmem_cache_t *file_slab = NULL; |
| static kmem_cache_t *stateid_slab = NULL; |
| static kmem_cache_t *deleg_slab = NULL; |
| |
| void |
| nfs4_lock_state(void) |
| { |
| mutex_lock(&client_mutex); |
| } |
| |
| void |
| nfs4_unlock_state(void) |
| { |
| mutex_unlock(&client_mutex); |
| } |
| |
| static inline u32 |
| opaque_hashval(const void *ptr, int nbytes) |
| { |
| unsigned char *cptr = (unsigned char *) ptr; |
| |
| u32 x = 0; |
| while (nbytes--) { |
| x *= 37; |
| x += *cptr++; |
| } |
| return x; |
| } |
| |
| /* forward declarations */ |
| static void release_stateowner(struct nfs4_stateowner *sop); |
| static void release_stateid(struct nfs4_stateid *stp, int flags); |
| |
| /* |
| * Delegation state |
| */ |
| |
| /* recall_lock protects the del_recall_lru */ |
| static DEFINE_SPINLOCK(recall_lock); |
| static struct list_head del_recall_lru; |
| |
| static void |
| free_nfs4_file(struct kref *kref) |
| { |
| struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref); |
| list_del(&fp->fi_hash); |
| iput(fp->fi_inode); |
| kmem_cache_free(file_slab, fp); |
| } |
| |
| static inline void |
| put_nfs4_file(struct nfs4_file *fi) |
| { |
| kref_put(&fi->fi_ref, free_nfs4_file); |
| } |
| |
| static inline void |
| get_nfs4_file(struct nfs4_file *fi) |
| { |
| kref_get(&fi->fi_ref); |
| } |
| |
| static int num_delegations; |
| |
| /* |
| * Open owner state (share locks) |
| */ |
| |
| /* hash tables for nfs4_stateowner */ |
| #define OWNER_HASH_BITS 8 |
| #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS) |
| #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1) |
| |
| #define ownerid_hashval(id) \ |
| ((id) & OWNER_HASH_MASK) |
| #define ownerstr_hashval(clientid, ownername) \ |
| (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK) |
| |
| static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE]; |
| static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE]; |
| |
| /* hash table for nfs4_file */ |
| #define FILE_HASH_BITS 8 |
| #define FILE_HASH_SIZE (1 << FILE_HASH_BITS) |
| #define FILE_HASH_MASK (FILE_HASH_SIZE - 1) |
| /* hash table for (open)nfs4_stateid */ |
| #define STATEID_HASH_BITS 10 |
| #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS) |
| #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1) |
| |
| #define file_hashval(x) \ |
| hash_ptr(x, FILE_HASH_BITS) |
| #define stateid_hashval(owner_id, file_id) \ |
| (((owner_id) + (file_id)) & STATEID_HASH_MASK) |
| |
| static struct list_head file_hashtbl[FILE_HASH_SIZE]; |
| static struct list_head stateid_hashtbl[STATEID_HASH_SIZE]; |
| |
| static struct nfs4_delegation * |
| alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type) |
| { |
| struct nfs4_delegation *dp; |
| struct nfs4_file *fp = stp->st_file; |
| struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback; |
| |
| dprintk("NFSD alloc_init_deleg\n"); |
| if (num_delegations > STATEID_HASH_SIZE * 4) |
| return NULL; |
| dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL); |
| if (dp == NULL) |
| return dp; |
| num_delegations++; |
| INIT_LIST_HEAD(&dp->dl_perfile); |
| INIT_LIST_HEAD(&dp->dl_perclnt); |
| INIT_LIST_HEAD(&dp->dl_recall_lru); |
| dp->dl_client = clp; |
| get_nfs4_file(fp); |
| dp->dl_file = fp; |
| dp->dl_flock = NULL; |
| get_file(stp->st_vfs_file); |
| dp->dl_vfs_file = stp->st_vfs_file; |
| dp->dl_type = type; |
| dp->dl_recall.cbr_dp = NULL; |
| dp->dl_recall.cbr_ident = cb->cb_ident; |
| dp->dl_recall.cbr_trunc = 0; |
| dp->dl_stateid.si_boot = boot_time; |
| dp->dl_stateid.si_stateownerid = current_delegid++; |
| dp->dl_stateid.si_fileid = 0; |
| dp->dl_stateid.si_generation = 0; |
| dp->dl_fhlen = current_fh->fh_handle.fh_size; |
| memcpy(dp->dl_fhval, ¤t_fh->fh_handle.fh_base, |
| current_fh->fh_handle.fh_size); |
| dp->dl_time = 0; |
| atomic_set(&dp->dl_count, 1); |
| list_add(&dp->dl_perfile, &fp->fi_delegations); |
| list_add(&dp->dl_perclnt, &clp->cl_delegations); |
| return dp; |
| } |
| |
| void |
| nfs4_put_delegation(struct nfs4_delegation *dp) |
| { |
| if (atomic_dec_and_test(&dp->dl_count)) { |
| dprintk("NFSD: freeing dp %p\n",dp); |
| put_nfs4_file(dp->dl_file); |
| kmem_cache_free(deleg_slab, dp); |
| num_delegations--; |
| } |
| } |
| |
| /* Remove the associated file_lock first, then remove the delegation. |
| * lease_modify() is called to remove the FS_LEASE file_lock from |
| * the i_flock list, eventually calling nfsd's lock_manager |
| * fl_release_callback. |
| */ |
| static void |
| nfs4_close_delegation(struct nfs4_delegation *dp) |
| { |
| struct file *filp = dp->dl_vfs_file; |
| |
| dprintk("NFSD: close_delegation dp %p\n",dp); |
| dp->dl_vfs_file = NULL; |
| /* The following nfsd_close may not actually close the file, |
| * but we want to remove the lease in any case. */ |
| if (dp->dl_flock) |
| setlease(filp, F_UNLCK, &dp->dl_flock); |
| nfsd_close(filp); |
| } |
| |
| /* Called under the state lock. */ |
| static void |
| unhash_delegation(struct nfs4_delegation *dp) |
| { |
| list_del_init(&dp->dl_perfile); |
| list_del_init(&dp->dl_perclnt); |
| spin_lock(&recall_lock); |
| list_del_init(&dp->dl_recall_lru); |
| spin_unlock(&recall_lock); |
| nfs4_close_delegation(dp); |
| nfs4_put_delegation(dp); |
| } |
| |
| /* |
| * SETCLIENTID state |
| */ |
| |
| /* Hash tables for nfs4_clientid state */ |
| #define CLIENT_HASH_BITS 4 |
| #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) |
| #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) |
| |
| #define clientid_hashval(id) \ |
| ((id) & CLIENT_HASH_MASK) |
| #define clientstr_hashval(name) \ |
| (opaque_hashval((name), 8) & CLIENT_HASH_MASK) |
| /* |
| * reclaim_str_hashtbl[] holds known client info from previous reset/reboot |
| * used in reboot/reset lease grace period processing |
| * |
| * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed |
| * setclientid_confirmed info. |
| * |
| * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed |
| * setclientid info. |
| * |
| * client_lru holds client queue ordered by nfs4_client.cl_time |
| * for lease renewal. |
| * |
| * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time |
| * for last close replay. |
| */ |
| static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE]; |
| static int reclaim_str_hashtbl_size = 0; |
| static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE]; |
| static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE]; |
| static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE]; |
| static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE]; |
| static struct list_head client_lru; |
| static struct list_head close_lru; |
| |
| 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)\n", |
| clid->cl_boot, clid->cl_id); |
| 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 inline struct nfs4_client * |
| alloc_client(struct xdr_netobj name) |
| { |
| struct nfs4_client *clp; |
| |
| if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) { |
| memset(clp, 0, sizeof(*clp)); |
| if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) { |
| memcpy(clp->cl_name.data, name.data, name.len); |
| clp->cl_name.len = name.len; |
| } |
| else { |
| kfree(clp); |
| clp = NULL; |
| } |
| } |
| return clp; |
| } |
| |
| static inline void |
| free_client(struct nfs4_client *clp) |
| { |
| if (clp->cl_cred.cr_group_info) |
| put_group_info(clp->cl_cred.cr_group_info); |
| 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 |
| shutdown_callback_client(struct nfs4_client *clp) |
| { |
| struct rpc_clnt *clnt = clp->cl_callback.cb_client; |
| |
| /* shutdown rpc client, ending any outstanding recall rpcs */ |
| if (clnt) { |
| clp->cl_callback.cb_client = NULL; |
| rpc_shutdown_client(clnt); |
| rpciod_down(); |
| } |
| } |
| |
| 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)); |
| |
| shutdown_callback_client(clp); |
| |
| 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_stateowner(sop); |
| } |
| put_nfs4_client(clp); |
| } |
| |
| static struct nfs4_client * |
| create_client(struct xdr_netobj name, char *recdir) { |
| struct nfs4_client *clp; |
| |
| if (!(clp = alloc_client(name))) |
| goto out; |
| memcpy(clp->cl_recdir, recdir, HEXDIR_LEN); |
| atomic_set(&clp->cl_count, 1); |
| atomic_set(&clp->cl_callback.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_lru); |
| out: |
| return 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 inline int |
| same_name(const char *n1, const char *n2) { |
| return 0 == memcmp(n1, n2, HEXDIR_LEN); |
| } |
| |
| static int |
| cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) { |
| return(!memcmp(v1->data,v2->data,sizeof(v1->data))); |
| } |
| |
| static int |
| cmp_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 |
| cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){ |
| return(cr1->cr_uid == cr2->cr_uid); |
| |
| } |
| |
| static void |
| gen_clid(struct nfs4_client *clp) { |
| clp->cl_clientid.cl_boot = boot_time; |
| clp->cl_clientid.cl_id = current_clientid++; |
| } |
| |
| static void |
| gen_confirm(struct nfs4_client *clp) { |
| struct timespec tv; |
| u32 * p; |
| |
| tv = CURRENT_TIME; |
| p = (u32 *)clp->cl_confirm.data; |
| *p++ = tv.tv_sec; |
| *p++ = tv.tv_nsec; |
| } |
| |
| static int |
| check_name(struct xdr_netobj name) { |
| |
| if (name.len == 0) |
| return 0; |
| if (name.len > NFS4_OPAQUE_LIMIT) { |
| printk("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 (cmp_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 (cmp_clid(&clp->cl_clientid, clid)) |
| return clp; |
| } |
| return NULL; |
| } |
| |
| static struct nfs4_client * |
| find_confirmed_client_by_str(const char *dname, unsigned int hashval) |
| { |
| struct nfs4_client *clp; |
| |
| list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) { |
| if (same_name(clp->cl_recdir, dname)) |
| return clp; |
| } |
| return NULL; |
| } |
| |
| static struct nfs4_client * |
| find_unconfirmed_client_by_str(const char *dname, unsigned int hashval) |
| { |
| struct nfs4_client *clp; |
| |
| list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) { |
| if (same_name(clp->cl_recdir, dname)) |
| return clp; |
| } |
| return NULL; |
| } |
| |
| /* a helper function for parse_callback */ |
| static int |
| parse_octet(unsigned int *lenp, char **addrp) |
| { |
| unsigned int len = *lenp; |
| char *p = *addrp; |
| int n = -1; |
| char c; |
| |
| for (;;) { |
| if (!len) |
| break; |
| len--; |
| c = *p++; |
| if (c == '.') |
| break; |
| if ((c < '0') || (c > '9')) { |
| n = -1; |
| break; |
| } |
| if (n < 0) |
| n = 0; |
| n = (n * 10) + (c - '0'); |
| if (n > 255) { |
| n = -1; |
| break; |
| } |
| } |
| *lenp = len; |
| *addrp = p; |
| return n; |
| } |
| |
| /* parse and set the setclientid ipv4 callback address */ |
| static int |
| parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp) |
| { |
| int temp = 0; |
| u32 cbaddr = 0; |
| u16 cbport = 0; |
| u32 addrlen = addr_len; |
| char *addr = addr_val; |
| int i, shift; |
| |
| /* ipaddress */ |
| shift = 24; |
| for(i = 4; i > 0 ; i--) { |
| if ((temp = parse_octet(&addrlen, &addr)) < 0) { |
| return 0; |
| } |
| cbaddr |= (temp << shift); |
| if (shift > 0) |
| shift -= 8; |
| } |
| *cbaddrp = cbaddr; |
| |
| /* port */ |
| shift = 8; |
| for(i = 2; i > 0 ; i--) { |
| if ((temp = parse_octet(&addrlen, &addr)) < 0) { |
| return 0; |
| } |
| cbport |= (temp << shift); |
| if (shift > 0) |
| shift -= 8; |
| } |
| *cbportp = cbport; |
| return 1; |
| } |
| |
| static void |
| gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se) |
| { |
| struct nfs4_callback *cb = &clp->cl_callback; |
| |
| /* Currently, we only support tcp for the callback channel */ |
| if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3)) |
| goto out_err; |
| |
| if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val, |
| &cb->cb_addr, &cb->cb_port))) |
| goto out_err; |
| cb->cb_prog = se->se_callback_prog; |
| cb->cb_ident = se->se_callback_ident; |
| return; |
| out_err: |
| 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; |
| } |
| |
| /* |
| * RFC 3010 has a complex implmentation description of processing a |
| * SETCLIENTID request consisting of 5 bullets, labeled as |
| * CASE0 - CASE4 below. |
| * |
| * NOTES: |
| * callback information will be processed in a future patch |
| * |
| * an unconfirmed record is added when: |
| * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record. |
| * CASE 1: confirmed record found with matching name, principal, |
| * verifier, and clientid. |
| * CASE 2: confirmed record found with matching name, principal, |
| * and there is no unconfirmed record with matching |
| * name and principal |
| * |
| * an unconfirmed record is replaced when: |
| * CASE 3: confirmed record found with matching name, principal, |
| * and an unconfirmed record is found with matching |
| * name, principal, and with clientid and |
| * confirm that does not match the confirmed record. |
| * CASE 4: there is no confirmed record with matching name and |
| * principal. there is an unconfirmed record with |
| * matching name, principal. |
| * |
| * an unconfirmed record is deleted when: |
| * CASE 1: an unconfirmed record that matches input name, verifier, |
| * and confirmed clientid. |
| * CASE 4: any unconfirmed records with matching name and principal |
| * that exist after an unconfirmed record has been replaced |
| * as described above. |
| * |
| */ |
| int |
| nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid) |
| { |
| u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr; |
| 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; |
| int 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); |
| if (conf) { |
| /* |
| * CASE 0: |
| * clname match, confirmed, different principal |
| * or different ip_address |
| */ |
| status = nfserr_clid_inuse; |
| if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred) |
| || conf->cl_addr != ip_addr) { |
| printk("NFSD: setclientid: string in use by client" |
| "(clientid %08x/%08x)\n", |
| conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id); |
| goto out; |
| } |
| } |
| unconf = find_unconfirmed_client_by_str(dname, strhashval); |
| status = nfserr_resource; |
| if (!conf) { |
| /* |
| * CASE 4: |
| * placed first, because it is the normal case. |
| */ |
| if (unconf) |
| expire_client(unconf); |
| new = create_client(clname, dname); |
| if (new == NULL) |
| goto out; |
| copy_verf(new, &clverifier); |
| new->cl_addr = ip_addr; |
| copy_cred(&new->cl_cred,&rqstp->rq_cred); |
| gen_clid(new); |
| gen_confirm(new); |
| gen_callback(new, setclid); |
| add_to_unconfirmed(new, strhashval); |
| } else if (cmp_verf(&conf->cl_verifier, &clverifier)) { |
| /* |
| * CASE 1: |
| * cl_name match, confirmed, principal match |
| * verifier match: probable callback update |
| * |
| * remove any unconfirmed nfs4_client with |
| * matching cl_name, cl_verifier, and cl_clientid |
| * |
| * create and insert an unconfirmed nfs4_client with same |
| * cl_name, cl_verifier, and cl_clientid as existing |
| * nfs4_client, but with the new callback info and a |
| * new cl_confirm |
| */ |
| 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); |
| if (new == NULL) |
| goto out; |
| copy_verf(new,&conf->cl_verifier); |
| new->cl_addr = ip_addr; |
| copy_cred(&new->cl_cred,&rqstp->rq_cred); |
| copy_clid(new, conf); |
| gen_confirm(new); |
| gen_callback(new, setclid); |
| add_to_unconfirmed(new,strhashval); |
| } else if (!unconf) { |
| /* |
| * CASE 2: |
| * clname match, confirmed, principal match |
| * verfier does not match |
| * no unconfirmed. create a new unconfirmed nfs4_client |
| * using input clverifier, clname, and callback info |
| * and generate a new cl_clientid and cl_confirm. |
| */ |
| new = create_client(clname, dname); |
| if (new == NULL) |
| goto out; |
| copy_verf(new,&clverifier); |
| new->cl_addr = ip_addr; |
| copy_cred(&new->cl_cred,&rqstp->rq_cred); |
| gen_clid(new); |
| gen_confirm(new); |
| gen_callback(new, setclid); |
| add_to_unconfirmed(new, strhashval); |
| } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) { |
| /* |
| * CASE3: |
| * confirmed found (name, principal match) |
| * confirmed verifier does not match input clverifier |
| * |
| * unconfirmed found (name match) |
| * confirmed->cl_confirm != unconfirmed->cl_confirm |
| * |
| * remove unconfirmed. |
| * |
| * create an unconfirmed nfs4_client |
| * with same cl_name as existing confirmed nfs4_client, |
| * but with new callback info, new cl_clientid, |
| * new cl_verifier and a new cl_confirm |
| */ |
| expire_client(unconf); |
| new = create_client(clname, dname); |
| if (new == NULL) |
| goto out; |
| copy_verf(new,&clverifier); |
| new->cl_addr = ip_addr; |
| copy_cred(&new->cl_cred,&rqstp->rq_cred); |
| gen_clid(new); |
| gen_confirm(new); |
| gen_callback(new, setclid); |
| add_to_unconfirmed(new, strhashval); |
| } else { |
| /* No cases hit !!! */ |
| status = nfserr_inval; |
| goto out; |
| |
| } |
| 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; |
| } |
| |
| |
| /* |
| * RFC 3010 has a complex implmentation description of processing a |
| * SETCLIENTID_CONFIRM request consisting of 4 bullets describing |
| * processing on a DRC miss, labeled as CASE1 - CASE4 below. |
| * |
| * NOTE: callback information will be processed here in a future patch |
| */ |
| int |
| nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm) |
| { |
| u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr; |
| struct nfs4_client *conf, *unconf; |
| nfs4_verifier confirm = setclientid_confirm->sc_confirm; |
| clientid_t * clid = &setclientid_confirm->sc_clientid; |
| int 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 && conf->cl_addr != ip_addr) |
| goto out; |
| if (unconf && unconf->cl_addr != ip_addr) |
| goto out; |
| |
| if ((conf && unconf) && |
| (cmp_verf(&unconf->cl_confirm, &confirm)) && |
| (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) && |
| (same_name(conf->cl_recdir,unconf->cl_recdir)) && |
| (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) { |
| /* CASE 1: |
| * unconf record that matches input clientid and input confirm. |
| * conf record that matches input clientid. |
| * conf and unconf records match names, verifiers |
| */ |
| if (!cmp_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_callback.cb_set, 0); |
| gen_confirm(conf); |
| nfsd4_remove_clid_dir(unconf); |
| expire_client(unconf); |
| status = nfs_ok; |
| |
| } |
| } else if ((conf && !unconf) || |
| ((conf && unconf) && |
| (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) || |
| !same_name(conf->cl_recdir, unconf->cl_recdir)))) { |
| /* CASE 2: |
| * conf record that matches input clientid. |
| * if unconf record matches input clientid, then |
| * unconf->cl_name or unconf->cl_verifier don't match the |
| * conf record. |
| */ |
| if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) |
| status = nfserr_clid_inuse; |
| else |
| status = nfs_ok; |
| } else if (!conf && unconf |
| && cmp_verf(&unconf->cl_confirm, &confirm)) { |
| /* CASE 3: |
| * conf record not found. |
| * unconf record found. |
| * unconf->cl_confirm matches input confirm |
| */ |
| if (!cmp_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); |
| if (conf) { |
| nfsd4_remove_clid_dir(conf); |
| expire_client(conf); |
| } |
| move_to_confirmed(unconf); |
| conf = unconf; |
| status = nfs_ok; |
| } |
| } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) |
| && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, |
| &confirm)))) { |
| /* CASE 4: |
| * conf record not found, or if conf, conf->cl_confirm does not |
| * match input confirm. |
| * unconf record not found, or if unconf, unconf->cl_confirm |
| * does not match input confirm. |
| */ |
| status = nfserr_stale_clientid; |
| } else { |
| /* check that we have hit one of the cases...*/ |
| status = nfserr_clid_inuse; |
| } |
| out: |
| if (!status) |
| nfsd4_probe_callback(conf); |
| 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) { |
| kref_init(&fp->fi_ref); |
| INIT_LIST_HEAD(&fp->fi_hash); |
| INIT_LIST_HEAD(&fp->fi_stateids); |
| INIT_LIST_HEAD(&fp->fi_delegations); |
| list_add(&fp->fi_hash, &file_hashtbl[hashval]); |
| fp->fi_inode = igrab(ino); |
| fp->fi_id = current_fileid++; |
| return fp; |
| } |
| return NULL; |
| } |
| |
| static void |
| nfsd4_free_slab(kmem_cache_t **slab) |
| { |
| int status; |
| |
| if (*slab == NULL) |
| return; |
| status = kmem_cache_destroy(*slab); |
| *slab = NULL; |
| WARN_ON(status); |
| } |
| |
| static 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, NULL); |
| if (stateowner_slab == NULL) |
| goto out_nomem; |
| file_slab = kmem_cache_create("nfsd4_files", |
| sizeof(struct nfs4_file), 0, 0, NULL, NULL); |
| if (file_slab == NULL) |
| goto out_nomem; |
| stateid_slab = kmem_cache_create("nfsd4_stateids", |
| sizeof(struct nfs4_stateid), 0, 0, NULL, NULL); |
| if (stateid_slab == NULL) |
| goto out_nomem; |
| deleg_slab = kmem_cache_create("nfsd4_delegations", |
| sizeof(struct nfs4_delegation), 0, 0, NULL, 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 void |
| release_stateid_lockowners(struct nfs4_stateid *open_stp) |
| { |
| struct nfs4_stateowner *lock_sop; |
| |
| while (!list_empty(&open_stp->st_lockowners)) { |
| lock_sop = list_entry(open_stp->st_lockowners.next, |
| struct nfs4_stateowner, so_perstateid); |
| /* list_del(&open_stp->st_lockowners); */ |
| BUG_ON(lock_sop->so_is_open_owner); |
| release_stateowner(lock_sop); |
| } |
| } |
| |
| static void |
| unhash_stateowner(struct nfs4_stateowner *sop) |
| { |
| struct nfs4_stateid *stp; |
| |
| list_del(&sop->so_idhash); |
| list_del(&sop->so_strhash); |
| if (sop->so_is_open_owner) |
| list_del(&sop->so_perclient); |
| list_del(&sop->so_perstateid); |
| while (!list_empty(&sop->so_stateids)) { |
| stp = list_entry(sop->so_stateids.next, |
| struct nfs4_stateid, st_perstateowner); |
| if (sop->so_is_open_owner) |
| release_stateid(stp, OPEN_STATE); |
| else |
| release_stateid(stp, LOCK_STATE); |
| } |
| } |
| |
| static void |
| release_stateowner(struct nfs4_stateowner *sop) |
| { |
| unhash_stateowner(sop); |
| list_del(&sop->so_close_lru); |
| nfs4_put_stateowner(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 = boot_time; |
| 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, &stp->st_access_bmap); |
| __set_bit(open->op_share_deny, &stp->st_deny_bmap); |
| stp->st_openstp = NULL; |
| } |
| |
| static void |
| release_stateid(struct nfs4_stateid *stp, int flags) |
| { |
| struct file *filp = stp->st_vfs_file; |
| |
| list_del(&stp->st_hash); |
| list_del(&stp->st_perfile); |
| list_del(&stp->st_perstateowner); |
| if (flags & OPEN_STATE) { |
| release_stateid_lockowners(stp); |
| stp->st_vfs_file = NULL; |
| nfsd_close(filp); |
| } else if (flags & LOCK_STATE) |
| locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner); |
| put_nfs4_file(stp->st_file); |
| kmem_cache_free(stateid_slab, stp); |
| } |
| |
| 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 |
| cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) { |
| return ((sop->so_owner.len == owner->len) && |
| !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 (cmp_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; |
| |
| list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) { |
| if (fp->fi_inode == ino) { |
| get_nfs4_file(fp); |
| return fp; |
| } |
| } |
| return NULL; |
| } |
| |
| #define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0) |
| #define TEST_DENY(x) ((x >= 0 || x < 5)?1:0) |
| |
| 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 int |
| 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; |
| int 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) { |
| put_write_access(filp->f_dentry->d_inode); |
| filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE; |
| } |
| } |
| |
| /* |
| * Recall a delegation |
| */ |
| static int |
| do_recall(void *__dp) |
| { |
| struct nfs4_delegation *dp = __dp; |
| |
| daemonize("nfsv4-recall"); |
| |
| nfsd4_cb_recall(dp); |
| return 0; |
| } |
| |
| /* |
| * 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; |
| struct task_struct *t; |
| |
| 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); |
| |
| 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(); |
| |
| /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */ |
| fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ; |
| |
| t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall"); |
| if (IS_ERR(t)) { |
| struct nfs4_client *clp = dp->dl_client; |
| |
| printk(KERN_INFO "NFSD: Callback thread failed for " |
| "for client (clientid %08x/%08x)\n", |
| clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); |
| nfs4_put_delegation(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 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, |
| }; |
| |
| |
| int |
| nfsd4_process_open1(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; |
| } |
| if (!sop->so_confirmed) { |
| /* Replace unconfirmed owners without checking for replay. */ |
| clp = sop->so_client; |
| release_stateowner(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 int |
| 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 int |
| nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open, |
| struct nfs4_delegation **dp) |
| { |
| int flags; |
| int 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 int |
| nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp) |
| { |
| struct nfs4_stateid *local; |
| int 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 int |
| 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 { |
| int 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 int |
| 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 int |
| 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_dentry->d_inode; |
| unsigned int share_access, new_writer; |
| int status; |
| |
| set_access(&share_access, stp->st_access_bmap); |
| new_writer = (~share_access) & open->op_share_access |
| & NFS4_SHARE_ACCESS_WRITE; |
| |
| if (new_writer) { |
| status = get_write_access(inode); |
| if (status) |
| return nfserrno(status); |
| } |
| 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_callback *cb = &sop->so_client->cl_callback; |
| 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 (nfs4_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_end = OFFSET_MAX; |
| fl.fl_owner = (fl_owner_t)dp; |
| fl.fl_file = stp->st_vfs_file; |
| fl.fl_pid = current->tgid; |
| |
| /* setlease checks to see if delegation should be handed out. |
| * the lock_manager callbacks fl_mylease and fl_change are used |
| */ |
| if ((status = setlease(stp->st_vfs_file, |
| flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &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) |
| printk("NFSD: WARNING: refusing delegation reclaim\n"); |
| open->op_delegate_type = flag; |
| } |
| |
| /* |
| * called with nfs4_lock_state() held. |
| */ |
| int |
| nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) |
| { |
| struct nfs4_file *fp = NULL; |
| struct inode *ino = current_fh->fh_dentry->d_inode; |
| struct nfs4_stateid *stp = NULL; |
| struct nfs4_delegation *dp = NULL; |
| int status; |
| |
| status = nfserr_inval; |
| if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(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_WRITE) |
| flags = MAY_WRITE; |
| else |
| flags = MAY_READ; |
| 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_stateid(stp, OPEN_STATE); |
| goto out; |
| } |
| } |
| memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t)); |
| |
| /* |
| * 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) |
| open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; |
| |
| return status; |
| } |
| |
| static struct workqueue_struct *laundry_wq; |
| static struct work_struct laundromat_work; |
| static void laundromat_main(void *); |
| static DECLARE_WORK(laundromat_work, laundromat_main, NULL); |
| |
| int |
| nfsd4_renew(clientid_t *clid) |
| { |
| struct nfs4_client *clp; |
| int 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_callback.cb_set)) |
| goto out; |
| status = nfs_ok; |
| out: |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| static void |
| end_grace(void) |
| { |
| dprintk("NFSD: end of grace period\n"); |
| nfsd4_recdir_purge_old(); |
| in_grace = 0; |
| } |
| |
| 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 (in_grace) |
| 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_stateowner(sop); |
| } |
| if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT) |
| clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT; |
| nfs4_unlock_state(); |
| return clientid_val; |
| } |
| |
| void |
| laundromat_main(void *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_dentry->d_inode; |
| } |
| |
| static int |
| STALE_STATEID(stateid_t *stateid) |
| { |
| if (stateid->si_boot == boot_time) |
| return 0; |
| dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n", |
| stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid, |
| stateid->si_generation); |
| return 1; |
| } |
| |
| 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 |
| int nfs4_check_openmode(struct nfs4_stateid *stp, int flags) |
| { |
| int 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 int |
| check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags) |
| { |
| /* Trying to call delegreturn with a special stateid? Yuch: */ |
| if (!(flags & (RD_STATE | WR_STATE))) |
| return nfserr_bad_stateid; |
| else if (ONE_STATEID(stateid) && (flags & RD_STATE)) |
| return nfs_ok; |
| else if (nfs4_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 |
| io_during_grace_disallowed(struct inode *inode, int flags) |
| { |
| return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE)) |
| && MANDATORY_LOCK(inode); |
| } |
| |
| /* |
| * Checks for stateid operations |
| */ |
| int |
| nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp) |
| { |
| struct nfs4_stateid *stp = NULL; |
| struct nfs4_delegation *dp = NULL; |
| stateid_t *stidp; |
| struct inode *ino = current_fh->fh_dentry->d_inode; |
| int status; |
| |
| dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n", |
| stateid->si_boot, stateid->si_stateownerid, |
| stateid->si_fileid, stateid->si_generation); |
| if (filpp) |
| *filpp = NULL; |
| |
| if (io_during_grace_disallowed(ino, flags)) |
| return nfserr_grace; |
| |
| if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) |
| return check_special_stateids(current_fh, stateid, flags); |
| |
| /* STALE STATEID */ |
| status = nfserr_stale_stateid; |
| if (STALE_STATEID(stateid)) |
| goto out; |
| |
| /* BAD STATEID */ |
| status = nfserr_bad_stateid; |
| if (!stateid->si_fileid) { /* delegation stateid */ |
| if(!(dp = find_delegation_stateid(ino, stateid))) { |
| dprintk("NFSD: delegation stateid not found\n"); |
| if (nfs4_in_grace()) |
| status = nfserr_grace; |
| goto out; |
| } |
| stidp = &dp->dl_stateid; |
| } else { /* open or lock stateid */ |
| if (!(stp = find_stateid(stateid, flags))) { |
| dprintk("NFSD: open or lock stateid not found\n"); |
| if (nfs4_in_grace()) |
| status = nfserr_grace; |
| goto out; |
| } |
| if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) |
| goto out; |
| if (!stp->st_stateowner->so_confirmed) |
| goto out; |
| stidp = &stp->st_stateid; |
| } |
| if (stateid->si_generation > stidp->si_generation) |
| goto out; |
| |
| /* OLD STATEID */ |
| status = nfserr_old_stateid; |
| if (stateid->si_generation < stidp->si_generation) |
| goto out; |
| if (stp) { |
| if ((status = nfs4_check_openmode(stp,flags))) |
| goto out; |
| renew_client(stp->st_stateowner->so_client); |
| if (filpp) |
| *filpp = stp->st_vfs_file; |
| } else if (dp) { |
| if ((status = nfs4_check_delegmode(dp, flags))) |
| goto out; |
| renew_client(dp->dl_client); |
| if (flags & DELEG_RET) |
| unhash_delegation(dp); |
| if (filpp) |
| *filpp = dp->dl_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 int |
| nfs4_preprocess_seqid_op(struct svc_fh *current_fh, 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; |
| |
| 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)) { |
| printk("NFSD: preprocess_seqid_op: magic stateid!\n"); |
| return nfserr_bad_stateid; |
| } |
| |
| if (STALE_STATEID(stateid)) |
| return nfserr_stale_stateid; |
| /* |
| * 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 nfserr_bad_stateid; |
| *sopp = sop; |
| goto check_replay; |
| } |
| |
| if (lock) { |
| struct nfs4_stateowner *sop = stp->st_stateowner; |
| clientid_t *lockclid = &lock->v.new.clientid; |
| struct nfs4_client *clp = sop->so_client; |
| int lkflg = 0; |
| int status; |
| |
| lkflg = setlkflg(lock->lk_type); |
| |
| if (lock->lk_is_new) { |
| if (!sop->so_is_open_owner) |
| return nfserr_bad_stateid; |
| if (!cmp_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 ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) { |
| printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n"); |
| return nfserr_bad_stateid; |
| } |
| |
| *stpp = stp; |
| *sopp = sop = stp->st_stateowner; |
| |
| /* |
| * We now validate the seqid and stateid generation numbers. |
| * For the moment, we ignore the possibility of |
| * generation number wraparound. |
| */ |
| if (seqid != sop->so_seqid) |
| goto check_replay; |
| |
| if (sop->so_confirmed && flags & CONFIRM) { |
| printk("NFSD: preprocess_seqid_op: expected" |
| " unconfirmed stateowner!\n"); |
| return nfserr_bad_stateid; |
| } |
| if (!sop->so_confirmed && !(flags & CONFIRM)) { |
| printk("NFSD: preprocess_seqid_op: stateowner not" |
| " confirmed yet!\n"); |
| return nfserr_bad_stateid; |
| } |
| if (stateid->si_generation > stp->st_stateid.si_generation) { |
| printk("NFSD: preprocess_seqid_op: future stateid?!\n"); |
| return nfserr_bad_stateid; |
| } |
| |
| if (stateid->si_generation < stp->st_stateid.si_generation) { |
| printk("NFSD: preprocess_seqid_op: old stateid!\n"); |
| return nfserr_old_stateid; |
| } |
| 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; |
| } |
| printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n", |
| sop->so_seqid, seqid); |
| *sopp = NULL; |
| return nfserr_bad_seqid; |
| } |
| |
| int |
| nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc, struct nfs4_stateowner **replay_owner) |
| { |
| int status; |
| struct nfs4_stateowner *sop; |
| struct nfs4_stateid *stp; |
| |
| dprintk("NFSD: nfsd4_open_confirm on file %.*s\n", |
| (int)current_fh->fh_dentry->d_name.len, |
| current_fh->fh_dentry->d_name.name); |
| |
| if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) |
| goto out; |
| |
| nfs4_lock_state(); |
| |
| if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid, |
| &oc->oc_req_stateid, |
| CHECK_FH | 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); |
| *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); |
| } |
| } |
| |
| int |
| nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od, struct nfs4_stateowner **replay_owner) |
| { |
| int status; |
| struct nfs4_stateid *stp; |
| unsigned int share_access; |
| |
| dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", |
| (int)current_fh->fh_dentry->d_name.len, |
| current_fh->fh_dentry->d_name.name); |
| |
| if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny)) |
| return nfserr_inval; |
| |
| nfs4_lock_state(); |
| if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid, |
| &od->od_stateid, |
| CHECK_FH | 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); |
| *replay_owner = od->od_stateowner; |
| } |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| /* |
| * nfs4_unlock_state() called after encode |
| */ |
| int |
| nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close, struct nfs4_stateowner **replay_owner) |
| { |
| int status; |
| struct nfs4_stateid *stp; |
| |
| dprintk("NFSD: nfsd4_close on file %.*s\n", |
| (int)current_fh->fh_dentry->d_name.len, |
| current_fh->fh_dentry->d_name.name); |
| |
| nfs4_lock_state(); |
| /* check close_lru for replay */ |
| if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid, |
| &close->cl_stateid, |
| CHECK_FH | 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_stateid(stp, OPEN_STATE); |
| |
| /* 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); |
| *replay_owner = close->cl_stateowner; |
| } |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| int |
| nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr) |
| { |
| int status; |
| |
| if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) |
| goto out; |
| |
| nfs4_lock_state(); |
| status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL); |
| nfs4_unlock_state(); |
| out: |
| 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) |
| |
| #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 = NULL; |
| 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) || (flags & RD_STATE) || (flags & 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) || (flags & RD_STATE) || (flags & 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 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 = ~(u64)0; |
| if (fl->fl_end != ~(u64)0) |
| 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 (cmp_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 = boot_time; |
| 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 != ~(u64)0) && |
| LOFF_OVERFLOW(offset, length))); |
| } |
| |
| /* |
| * LOCK operation |
| */ |
| int |
| nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock, struct nfs4_stateowner **replay_owner) |
| { |
| 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; |
| int status = 0; |
| unsigned int strhashval; |
| |
| 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, current_fh, S_IFREG, 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 (STALE_CLIENTID(&lock->lk_new_clientid)) |
| goto out; |
| |
| /* validate and update open stateid and open seqid */ |
| status = nfs4_preprocess_seqid_op(current_fh, |
| lock->lk_new_open_seqid, |
| &lock->lk_new_open_stateid, |
| CHECK_FH | 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(current_fh, |
| lock->lk_old_lock_seqid, |
| &lock->lk_old_lock_stateid, |
| CHECK_FH | 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 (nfs4_in_grace() && !lock->lk_reclaim) |
| goto out; |
| status = nfserr_no_grace; |
| if (!nfs4_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; |
| break; |
| case NFS4_WRITE_LT: |
| case NFS4_WRITEW_LT: |
| file_lock.fl_type = F_WRLCK; |
| 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; |
| if ((lock->lk_length == ~(u64)0) || |
| LOFF_OVERFLOW(lock->lk_offset, lock->lk_length)) |
| file_lock.fl_end = ~(u64)0; |
| else |
| file_lock.fl_end = lock->lk_offset + lock->lk_length - 1; |
| 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. |
| */ |
| |
| /* XXX?: Just to divert the locks_release_private at the start of |
| * locks_copy_lock: */ |
| conflock.fl_ops = NULL; |
| conflock.fl_lmops = NULL; |
| status = posix_lock_file_conf(filp, &file_lock, &conflock); |
| dprintk("NFSD: nfsd4_lock: posix_lock_file_conf status %d\n",status); |
| switch (-status) { |
| case 0: /* success! */ |
| update_stateid(&lock_stp->st_stateid); |
| memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, |
| sizeof(stateid_t)); |
| 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: posix_lock_file_conf() failed! status %d\n",status); |
| status = nfserr_resource; |
| break; |
| } |
| out: |
| if (status && lock->lk_is_new && lock_sop) |
| release_stateowner(lock_sop); |
| if (lock->lk_replay_owner) { |
| nfs4_get_stateowner(lock->lk_replay_owner); |
| *replay_owner = lock->lk_replay_owner; |
| } |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| /* |
| * LOCKT operation |
| */ |
| int |
| nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt) |
| { |
| struct inode *inode; |
| struct file file; |
| struct file_lock file_lock; |
| struct file_lock conflock; |
| int status; |
| |
| if (nfs4_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 (STALE_CLIENTID(&lockt->lt_clientid)) |
| goto out; |
| |
| if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) { |
| dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n"); |
| if (status == nfserr_symlink) |
| status = nfserr_inval; |
| goto out; |
| } |
| |
| inode = 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: |
| printk("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_lmops = &nfsd_posix_mng_ops; |
| |
| file_lock.fl_start = lockt->lt_offset; |
| if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length)) |
| file_lock.fl_end = ~(u64)0; |
| else |
| file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1; |
| |
| nfs4_transform_lock_offset(&file_lock); |
| |
| /* posix_test_lock uses the struct file _only_ to resolve the inode. |
| * since LOCKT doesn't require an OPEN, and therefore a struct |
| * file may not exist, pass posix_test_lock a struct file with |
| * only the dentry:inode set. |
| */ |
| memset(&file, 0, sizeof (struct file)); |
| file.f_dentry = current_fh->fh_dentry; |
| |
| status = nfs_ok; |
| if (posix_test_lock(&file, &file_lock, &conflock)) { |
| status = nfserr_denied; |
| nfs4_set_lock_denied(&conflock, &lockt->lt_denied); |
| } |
| out: |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| int |
| nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku, struct nfs4_stateowner **replay_owner) |
| { |
| struct nfs4_stateid *stp; |
| struct file *filp = NULL; |
| struct file_lock file_lock; |
| int status; |
| |
| 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(current_fh, |
| locku->lu_seqid, |
| &locku->lu_stateid, |
| CHECK_FH | 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; |
| |
| if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length)) |
| file_lock.fl_end = ~(u64)0; |
| else |
| file_lock.fl_end = locku->lu_offset + locku->lu_length - 1; |
| nfs4_transform_lock_offset(&file_lock); |
| |
| /* |
| * Try to unlock the file in the VFS. |
| */ |
| status = posix_lock_file(filp, &file_lock); |
| if (status) { |
| dprintk("NFSD: nfs4_locku: posix_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); |
| *replay_owner = locku->lu_stateowner; |
| } |
| nfs4_unlock_state(); |
| return status; |
| |
| out_nfserr: |
| status = nfserrno(status); |
| 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_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; |
| } |
| |
| int |
| nfsd4_release_lockowner(struct svc_rqst *rqstp, 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; |
| int 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 (!cmp_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_stateowner(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) |
| { |
| unsigned int strhashval = clientstr_hashval(name); |
| struct nfs4_client *clp; |
| |
| clp = find_confirmed_client_by_str(name, strhashval); |
| 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. |
| */ |
| int |
| 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: */ |
| |
| void |
| nfs4_state_init(void) |
| { |
| int i; |
| |
| 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]); |
| } |
| 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); |
| for (i = 0; i < CLIENT_HASH_SIZE; i++) |
| INIT_LIST_HEAD(&reclaim_str_hashtbl[i]); |
| reclaim_str_hashtbl_size = 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"); |
| } |
| |
| /* initialization to perform when the nfsd service is started: */ |
| |
| static void |
| __nfs4_state_start(void) |
| { |
| time_t grace_time; |
| |
| boot_time = get_seconds(); |
| grace_time = max(user_lease_time, lease_time); |
| lease_time = user_lease_time; |
| in_grace = 1; |
| printk("NFSD: starting %ld-second grace period\n", grace_time); |
| laundry_wq = create_singlethread_workqueue("nfsd4"); |
| queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ); |
| } |
| |
| int |
| nfs4_state_start(void) |
| { |
| int status; |
| |
| if (nfs4_init) |
| return 0; |
| status = nfsd4_init_slabs(); |
| if (status) |
| return status; |
| nfsd4_load_reboot_recovery_data(); |
| __nfs4_state_start(); |
| nfs4_init = 1; |
| return 0; |
| } |
| |
| int |
| nfs4_in_grace(void) |
| { |
| return in_grace; |
| } |
| |
| 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); |
| } |
| |
| cancel_delayed_work(&laundromat_work); |
| nfsd4_shutdown_recdir(); |
| nfs4_init = 0; |
| } |
| |
| void |
| nfs4_state_shutdown(void) |
| { |
| cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work); |
| destroy_workqueue(laundry_wq); |
| nfs4_lock_state(); |
| nfs4_release_reclaim(); |
| __nfs4_state_shutdown(); |
| nfsd4_free_slabs(); |
| nfs4_unlock_state(); |
| } |
| |
| static void |
| nfs4_set_recdir(char *recdir) |
| { |
| nfs4_lock_state(); |
| strcpy(user_recovery_dirname, recdir); |
| nfs4_unlock_state(); |
| } |
| |
| /* |
| * Change the NFSv4 recovery directory to recdir. |
| */ |
| int |
| nfs4_reset_recoverydir(char *recdir) |
| { |
| int status; |
| struct nameidata nd; |
| |
| status = path_lookup(recdir, LOOKUP_FOLLOW, &nd); |
| if (status) |
| return status; |
| status = -ENOTDIR; |
| if (S_ISDIR(nd.dentry->d_inode->i_mode)) { |
| nfs4_set_recdir(recdir); |
| status = 0; |
| } |
| path_release(&nd); |
| return status; |
| } |
| |
| /* |
| * 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. |
| */ |
| void |
| nfs4_reset_lease(time_t leasetime) |
| { |
| lock_kernel(); |
| user_lease_time = leasetime; |
| unlock_kernel(); |
| } |