| /* |
| * 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/file.h> |
| #include <linux/fs.h> |
| #include <linux/slab.h> |
| #include <linux/namei.h> |
| #include <linux/swap.h> |
| #include <linux/sunrpc/svcauth_gss.h> |
| #include <linux/sunrpc/clnt.h> |
| #include "xdr4.h" |
| #include "vfs.h" |
| |
| #define NFSDDBG_FACILITY NFSDDBG_PROC |
| |
| /* Globals */ |
| time_t nfsd4_lease = 90; /* default lease time */ |
| time_t nfsd4_grace = 90; |
| static time_t boot_time; |
| static u32 current_ownerid = 1; |
| static u32 current_fileid = 1; |
| static u32 current_delegid = 1; |
| static stateid_t zerostateid; /* bits all 0 */ |
| static stateid_t onestateid; /* bits all 1 */ |
| static u64 current_sessionid = 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 char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; |
| static void nfs4_set_recdir(char *recdir); |
| |
| /* Locking: */ |
| |
| /* Currently used for almost all code touching nfsv4 state: */ |
| static DEFINE_MUTEX(client_mutex); |
| |
| /* |
| * Currently used for the del_recall_lru and file hash table. In an |
| * effort to decrease the scope of the client_mutex, this spinlock may |
| * eventually cover more: |
| */ |
| static DEFINE_SPINLOCK(recall_lock); |
| |
| static struct kmem_cache *stateowner_slab = NULL; |
| static struct kmem_cache *file_slab = NULL; |
| static struct kmem_cache *stateid_slab = NULL; |
| static struct kmem_cache *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; |
| } |
| |
| static struct list_head del_recall_lru; |
| |
| static inline void |
| put_nfs4_file(struct nfs4_file *fi) |
| { |
| if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) { |
| list_del(&fi->fi_hash); |
| spin_unlock(&recall_lock); |
| iput(fi->fi_inode); |
| kmem_cache_free(file_slab, fi); |
| } |
| } |
| |
| static inline void |
| get_nfs4_file(struct nfs4_file *fi) |
| { |
| atomic_inc(&fi->fi_ref); |
| } |
| |
| static int num_delegations; |
| unsigned int max_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 void __nfs4_file_get_access(struct nfs4_file *fp, int oflag) |
| { |
| BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR])); |
| atomic_inc(&fp->fi_access[oflag]); |
| } |
| |
| static void nfs4_file_get_access(struct nfs4_file *fp, int oflag) |
| { |
| if (oflag == O_RDWR) { |
| __nfs4_file_get_access(fp, O_RDONLY); |
| __nfs4_file_get_access(fp, O_WRONLY); |
| } else |
| __nfs4_file_get_access(fp, oflag); |
| } |
| |
| static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag) |
| { |
| if (fp->fi_fds[oflag]) { |
| fput(fp->fi_fds[oflag]); |
| fp->fi_fds[oflag] = NULL; |
| } |
| } |
| |
| static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag) |
| { |
| if (atomic_dec_and_test(&fp->fi_access[oflag])) { |
| nfs4_file_put_fd(fp, O_RDWR); |
| nfs4_file_put_fd(fp, oflag); |
| } |
| } |
| |
| static void nfs4_file_put_access(struct nfs4_file *fp, int oflag) |
| { |
| if (oflag == O_RDWR) { |
| __nfs4_file_put_access(fp, O_RDONLY); |
| __nfs4_file_put_access(fp, O_WRONLY); |
| } else |
| __nfs4_file_put_access(fp, oflag); |
| } |
| |
| 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; |
| |
| dprintk("NFSD alloc_init_deleg\n"); |
| /* |
| * Major work on the lease subsystem (for example, to support |
| * calbacks on stat) will be required before we can support |
| * write delegations properly. |
| */ |
| if (type != NFS4_OPEN_DELEGATE_READ) |
| return NULL; |
| if (fp->fi_had_conflict) |
| return NULL; |
| if (num_delegations > max_delegations) |
| 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; |
| nfs4_file_get_access(fp, O_RDONLY); |
| dp->dl_flock = NULL; |
| dp->dl_type = type; |
| 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; |
| fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle); |
| 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); |
| INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc); |
| 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 = find_readable_file(dp->dl_file); |
| |
| dprintk("NFSD: close_delegation dp %p\n",dp); |
| if (dp->dl_flock) |
| vfs_setlease(filp, F_UNLCK, &dp->dl_flock); |
| nfs4_file_put_access(dp->dl_file, O_RDONLY); |
| } |
| |
| /* 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 |
| */ |
| |
| /* client_lock protects the client lru list and session hash table */ |
| static DEFINE_SPINLOCK(client_lock); |
| |
| /* 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 void unhash_generic_stateid(struct nfs4_stateid *stp) |
| { |
| list_del(&stp->st_hash); |
| list_del(&stp->st_perfile); |
| list_del(&stp->st_perstateowner); |
| } |
| |
| static void free_generic_stateid(struct nfs4_stateid *stp) |
| { |
| put_nfs4_file(stp->st_file); |
| kmem_cache_free(stateid_slab, stp); |
| } |
| |
| static void release_lock_stateid(struct nfs4_stateid *stp) |
| { |
| struct file *file; |
| |
| unhash_generic_stateid(stp); |
| file = find_any_file(stp->st_file); |
| if (file) |
| locks_remove_posix(file, (fl_owner_t)stp->st_stateowner); |
| free_generic_stateid(stp); |
| } |
| |
| static void unhash_lockowner(struct nfs4_stateowner *sop) |
| { |
| struct nfs4_stateid *stp; |
| |
| list_del(&sop->so_idhash); |
| list_del(&sop->so_strhash); |
| list_del(&sop->so_perstateid); |
| while (!list_empty(&sop->so_stateids)) { |
| stp = list_first_entry(&sop->so_stateids, |
| struct nfs4_stateid, st_perstateowner); |
| release_lock_stateid(stp); |
| } |
| } |
| |
| static void release_lockowner(struct nfs4_stateowner *sop) |
| { |
| unhash_lockowner(sop); |
| nfs4_put_stateowner(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_lockowner(lock_sop); |
| } |
| } |
| |
| /* |
| * We store the NONE, READ, WRITE, and BOTH bits separately in the |
| * st_{access,deny}_bmap field of the stateid, in order to track not |
| * only what share bits are currently in force, but also what |
| * combinations of share bits previous opens have used. This allows us |
| * to enforce the recommendation of rfc 3530 14.2.19 that the server |
| * return an error if the client attempt to downgrade to a combination |
| * of share bits not explicable by closing some of its previous opens. |
| * |
| * XXX: This enforcement is actually incomplete, since we don't keep |
| * track of access/deny bit combinations; so, e.g., we allow: |
| * |
| * OPEN allow read, deny write |
| * OPEN allow both, deny none |
| * DOWNGRADE allow read, deny none |
| * |
| * which we should reject. |
| */ |
| static void |
| set_access(unsigned int *access, unsigned long bmap) { |
| int i; |
| |
| *access = 0; |
| for (i = 1; i < 4; i++) { |
| if (test_bit(i, &bmap)) |
| *access |= i; |
| } |
| } |
| |
| static void |
| set_deny(unsigned int *deny, unsigned long bmap) { |
| int i; |
| |
| *deny = 0; |
| for (i = 0; i < 4; i++) { |
| if (test_bit(i, &bmap)) |
| *deny |= i ; |
| } |
| } |
| |
| static int |
| test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) { |
| unsigned int access, deny; |
| |
| set_access(&access, stp->st_access_bmap); |
| set_deny(&deny, stp->st_deny_bmap); |
| if ((access & open->op_share_deny) || (deny & open->op_share_access)) |
| return 0; |
| return 1; |
| } |
| |
| static int nfs4_access_to_omode(u32 access) |
| { |
| switch (access & NFS4_SHARE_ACCESS_BOTH) { |
| case NFS4_SHARE_ACCESS_READ: |
| return O_RDONLY; |
| case NFS4_SHARE_ACCESS_WRITE: |
| return O_WRONLY; |
| case NFS4_SHARE_ACCESS_BOTH: |
| return O_RDWR; |
| } |
| BUG(); |
| } |
| |
| static int nfs4_access_bmap_to_omode(struct nfs4_stateid *stp) |
| { |
| unsigned int access; |
| |
| set_access(&access, stp->st_access_bmap); |
| return nfs4_access_to_omode(access); |
| } |
| |
| static void release_open_stateid(struct nfs4_stateid *stp) |
| { |
| int oflag = nfs4_access_bmap_to_omode(stp); |
| |
| unhash_generic_stateid(stp); |
| release_stateid_lockowners(stp); |
| nfs4_file_put_access(stp->st_file, oflag); |
| free_generic_stateid(stp); |
| } |
| |
| static void unhash_openowner(struct nfs4_stateowner *sop) |
| { |
| struct nfs4_stateid *stp; |
| |
| list_del(&sop->so_idhash); |
| list_del(&sop->so_strhash); |
| list_del(&sop->so_perclient); |
| list_del(&sop->so_perstateid); /* XXX: necessary? */ |
| while (!list_empty(&sop->so_stateids)) { |
| stp = list_first_entry(&sop->so_stateids, |
| struct nfs4_stateid, st_perstateowner); |
| release_open_stateid(stp); |
| } |
| } |
| |
| static void release_openowner(struct nfs4_stateowner *sop) |
| { |
| unhash_openowner(sop); |
| list_del(&sop->so_close_lru); |
| nfs4_put_stateowner(sop); |
| } |
| |
| #define SESSION_HASH_SIZE 512 |
| static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE]; |
| |
| static inline int |
| hash_sessionid(struct nfs4_sessionid *sessionid) |
| { |
| struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid; |
| |
| return sid->sequence % SESSION_HASH_SIZE; |
| } |
| |
| static inline void |
| dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid) |
| { |
| u32 *ptr = (u32 *)(&sessionid->data[0]); |
| dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]); |
| } |
| |
| static void |
| gen_sessionid(struct nfsd4_session *ses) |
| { |
| struct nfs4_client *clp = ses->se_client; |
| struct nfsd4_sessionid *sid; |
| |
| sid = (struct nfsd4_sessionid *)ses->se_sessionid.data; |
| sid->clientid = clp->cl_clientid; |
| sid->sequence = current_sessionid++; |
| sid->reserved = 0; |
| } |
| |
| /* |
| * The protocol defines ca_maxresponssize_cached to include the size of |
| * the rpc header, but all we need to cache is the data starting after |
| * the end of the initial SEQUENCE operation--the rest we regenerate |
| * each time. Therefore we can advertise a ca_maxresponssize_cached |
| * value that is the number of bytes in our cache plus a few additional |
| * bytes. In order to stay on the safe side, and not promise more than |
| * we can cache, those additional bytes must be the minimum possible: 24 |
| * bytes of rpc header (xid through accept state, with AUTH_NULL |
| * verifier), 12 for the compound header (with zero-length tag), and 44 |
| * for the SEQUENCE op response: |
| */ |
| #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44) |
| |
| static void |
| free_session_slots(struct nfsd4_session *ses) |
| { |
| int i; |
| |
| for (i = 0; i < ses->se_fchannel.maxreqs; i++) |
| kfree(ses->se_slots[i]); |
| } |
| |
| /* |
| * We don't actually need to cache the rpc and session headers, so we |
| * can allocate a little less for each slot: |
| */ |
| static inline int slot_bytes(struct nfsd4_channel_attrs *ca) |
| { |
| return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ; |
| } |
| |
| static int nfsd4_sanitize_slot_size(u32 size) |
| { |
| size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */ |
| size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE); |
| |
| return size; |
| } |
| |
| /* |
| * XXX: If we run out of reserved DRC memory we could (up to a point) |
| * re-negotiate active sessions and reduce their slot usage to make |
| * rooom for new connections. For now we just fail the create session. |
| */ |
| static int nfsd4_get_drc_mem(int slotsize, u32 num) |
| { |
| int avail; |
| |
| num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION); |
| |
| spin_lock(&nfsd_drc_lock); |
| avail = min_t(int, NFSD_MAX_MEM_PER_SESSION, |
| nfsd_drc_max_mem - nfsd_drc_mem_used); |
| num = min_t(int, num, avail / slotsize); |
| nfsd_drc_mem_used += num * slotsize; |
| spin_unlock(&nfsd_drc_lock); |
| |
| return num; |
| } |
| |
| static void nfsd4_put_drc_mem(int slotsize, int num) |
| { |
| spin_lock(&nfsd_drc_lock); |
| nfsd_drc_mem_used -= slotsize * num; |
| spin_unlock(&nfsd_drc_lock); |
| } |
| |
| static struct nfsd4_session *alloc_session(int slotsize, int numslots) |
| { |
| struct nfsd4_session *new; |
| int mem, i; |
| |
| BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *) |
| + sizeof(struct nfsd4_session) > PAGE_SIZE); |
| mem = numslots * sizeof(struct nfsd4_slot *); |
| |
| new = kzalloc(sizeof(*new) + mem, GFP_KERNEL); |
| if (!new) |
| return NULL; |
| /* allocate each struct nfsd4_slot and data cache in one piece */ |
| for (i = 0; i < numslots; i++) { |
| mem = sizeof(struct nfsd4_slot) + slotsize; |
| new->se_slots[i] = kzalloc(mem, GFP_KERNEL); |
| if (!new->se_slots[i]) |
| goto out_free; |
| } |
| return new; |
| out_free: |
| while (i--) |
| kfree(new->se_slots[i]); |
| kfree(new); |
| return NULL; |
| } |
| |
| static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize) |
| { |
| u32 maxrpc = nfsd_serv->sv_max_mesg; |
| |
| new->maxreqs = numslots; |
| new->maxresp_cached = slotsize + NFSD_MIN_HDR_SEQ_SZ; |
| new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc); |
| new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc); |
| new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND); |
| } |
| |
| static void free_conn(struct nfsd4_conn *c) |
| { |
| svc_xprt_put(c->cn_xprt); |
| kfree(c); |
| } |
| |
| static void nfsd4_conn_lost(struct svc_xpt_user *u) |
| { |
| struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user); |
| struct nfs4_client *clp = c->cn_session->se_client; |
| |
| spin_lock(&clp->cl_lock); |
| if (!list_empty(&c->cn_persession)) { |
| list_del(&c->cn_persession); |
| free_conn(c); |
| } |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags) |
| { |
| struct nfsd4_conn *conn; |
| |
| conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL); |
| if (!conn) |
| return NULL; |
| svc_xprt_get(rqstp->rq_xprt); |
| conn->cn_xprt = rqstp->rq_xprt; |
| conn->cn_flags = flags; |
| INIT_LIST_HEAD(&conn->cn_xpt_user.list); |
| return conn; |
| } |
| |
| static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) |
| { |
| conn->cn_session = ses; |
| list_add(&conn->cn_persession, &ses->se_conns); |
| } |
| |
| static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses) |
| { |
| struct nfs4_client *clp = ses->se_client; |
| |
| spin_lock(&clp->cl_lock); |
| __nfsd4_hash_conn(conn, ses); |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| static int nfsd4_register_conn(struct nfsd4_conn *conn) |
| { |
| conn->cn_xpt_user.callback = nfsd4_conn_lost; |
| return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user); |
| } |
| |
| static __be32 nfsd4_new_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses) |
| { |
| struct nfsd4_conn *conn; |
| u32 flags = NFS4_CDFC4_FORE; |
| int ret; |
| |
| if (ses->se_flags & SESSION4_BACK_CHAN) |
| flags |= NFS4_CDFC4_BACK; |
| conn = alloc_conn(rqstp, flags); |
| if (!conn) |
| return nfserr_jukebox; |
| nfsd4_hash_conn(conn, ses); |
| ret = nfsd4_register_conn(conn); |
| if (ret) |
| /* oops; xprt is already down: */ |
| nfsd4_conn_lost(&conn->cn_xpt_user); |
| return nfs_ok; |
| } |
| |
| static void nfsd4_del_conns(struct nfsd4_session *s) |
| { |
| struct nfs4_client *clp = s->se_client; |
| struct nfsd4_conn *c; |
| |
| spin_lock(&clp->cl_lock); |
| while (!list_empty(&s->se_conns)) { |
| c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession); |
| list_del_init(&c->cn_persession); |
| spin_unlock(&clp->cl_lock); |
| |
| unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user); |
| free_conn(c); |
| |
| spin_lock(&clp->cl_lock); |
| } |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| void free_session(struct kref *kref) |
| { |
| struct nfsd4_session *ses; |
| int mem; |
| |
| ses = container_of(kref, struct nfsd4_session, se_ref); |
| nfsd4_del_conns(ses); |
| spin_lock(&nfsd_drc_lock); |
| mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel); |
| nfsd_drc_mem_used -= mem; |
| spin_unlock(&nfsd_drc_lock); |
| free_session_slots(ses); |
| kfree(ses); |
| } |
| |
| static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, struct nfsd4_create_session *cses) |
| { |
| struct nfsd4_session *new; |
| struct nfsd4_channel_attrs *fchan = &cses->fore_channel; |
| int numslots, slotsize; |
| int status; |
| int idx; |
| |
| /* |
| * Note decreasing slot size below client's request may |
| * make it difficult for client to function correctly, whereas |
| * decreasing the number of slots will (just?) affect |
| * performance. When short on memory we therefore prefer to |
| * decrease number of slots instead of their size. |
| */ |
| slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached); |
| numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs); |
| |
| new = alloc_session(slotsize, numslots); |
| if (!new) { |
| nfsd4_put_drc_mem(slotsize, fchan->maxreqs); |
| return NULL; |
| } |
| init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize); |
| |
| new->se_client = clp; |
| gen_sessionid(new); |
| |
| INIT_LIST_HEAD(&new->se_conns); |
| |
| new->se_cb_seq_nr = 1; |
| new->se_flags = cses->flags; |
| new->se_cb_prog = cses->callback_prog; |
| kref_init(&new->se_ref); |
| idx = hash_sessionid(&new->se_sessionid); |
| spin_lock(&client_lock); |
| list_add(&new->se_hash, &sessionid_hashtbl[idx]); |
| list_add(&new->se_perclnt, &clp->cl_sessions); |
| spin_unlock(&client_lock); |
| |
| status = nfsd4_new_conn(rqstp, new); |
| /* whoops: benny points out, status is ignored! (err, or bogus) */ |
| if (status) { |
| free_session(&new->se_ref); |
| return NULL; |
| } |
| if (!clp->cl_cb_session && (cses->flags & SESSION4_BACK_CHAN)) { |
| struct sockaddr *sa = svc_addr(rqstp); |
| |
| clp->cl_cb_session = new; |
| clp->cl_cb_conn.cb_xprt = rqstp->rq_xprt; |
| svc_xprt_get(rqstp->rq_xprt); |
| rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa); |
| clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa); |
| nfsd4_probe_callback(clp); |
| } |
| return new; |
| } |
| |
| /* caller must hold client_lock */ |
| static struct nfsd4_session * |
| find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid) |
| { |
| struct nfsd4_session *elem; |
| int idx; |
| |
| dump_sessionid(__func__, sessionid); |
| idx = hash_sessionid(sessionid); |
| /* Search in the appropriate list */ |
| list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) { |
| if (!memcmp(elem->se_sessionid.data, sessionid->data, |
| NFS4_MAX_SESSIONID_LEN)) { |
| return elem; |
| } |
| } |
| |
| dprintk("%s: session not found\n", __func__); |
| return NULL; |
| } |
| |
| /* caller must hold client_lock */ |
| static void |
| unhash_session(struct nfsd4_session *ses) |
| { |
| list_del(&ses->se_hash); |
| list_del(&ses->se_perclnt); |
| } |
| |
| /* must be called under the client_lock */ |
| static inline void |
| renew_client_locked(struct nfs4_client *clp) |
| { |
| if (is_client_expired(clp)) { |
| dprintk("%s: client (clientid %08x/%08x) already expired\n", |
| __func__, |
| clp->cl_clientid.cl_boot, |
| clp->cl_clientid.cl_id); |
| return; |
| } |
| |
| /* |
| * 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(); |
| } |
| |
| static inline void |
| renew_client(struct nfs4_client *clp) |
| { |
| spin_lock(&client_lock); |
| renew_client_locked(clp); |
| spin_unlock(&client_lock); |
| } |
| |
| /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */ |
| static int |
| STALE_CLIENTID(clientid_t *clid) |
| { |
| if (clid->cl_boot == boot_time) |
| return 0; |
| dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n", |
| clid->cl_boot, clid->cl_id, boot_time); |
| return 1; |
| } |
| |
| /* |
| * XXX Should we use a slab cache ? |
| * This type of memory management is somewhat inefficient, but we use it |
| * anyway since SETCLIENTID is not a common operation. |
| */ |
| static struct nfs4_client *alloc_client(struct xdr_netobj name) |
| { |
| struct nfs4_client *clp; |
| |
| clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL); |
| if (clp == NULL) |
| return NULL; |
| clp->cl_name.data = kmalloc(name.len, GFP_KERNEL); |
| if (clp->cl_name.data == NULL) { |
| kfree(clp); |
| return NULL; |
| } |
| memcpy(clp->cl_name.data, name.data, name.len); |
| clp->cl_name.len = name.len; |
| return clp; |
| } |
| |
| static inline void |
| free_client(struct nfs4_client *clp) |
| { |
| while (!list_empty(&clp->cl_sessions)) { |
| struct nfsd4_session *ses; |
| ses = list_entry(clp->cl_sessions.next, struct nfsd4_session, |
| se_perclnt); |
| list_del(&ses->se_perclnt); |
| nfsd4_put_session(ses); |
| } |
| if (clp->cl_cred.cr_group_info) |
| put_group_info(clp->cl_cred.cr_group_info); |
| kfree(clp->cl_principal); |
| kfree(clp->cl_name.data); |
| kfree(clp); |
| } |
| |
| void |
| release_session_client(struct nfsd4_session *session) |
| { |
| struct nfs4_client *clp = session->se_client; |
| |
| if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock)) |
| return; |
| if (is_client_expired(clp)) { |
| free_client(clp); |
| session->se_client = NULL; |
| } else |
| renew_client_locked(clp); |
| spin_unlock(&client_lock); |
| } |
| |
| /* must be called under the client_lock */ |
| static inline void |
| unhash_client_locked(struct nfs4_client *clp) |
| { |
| struct nfsd4_session *ses; |
| |
| mark_client_expired(clp); |
| list_del(&clp->cl_lru); |
| list_for_each_entry(ses, &clp->cl_sessions, se_perclnt) |
| list_del_init(&ses->se_hash); |
| } |
| |
| static void |
| expire_client(struct nfs4_client *clp) |
| { |
| struct nfs4_stateowner *sop; |
| struct nfs4_delegation *dp; |
| struct list_head reaplist; |
| |
| 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); |
| } |
| while (!list_empty(&clp->cl_openowners)) { |
| sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient); |
| release_openowner(sop); |
| } |
| nfsd4_shutdown_callback(clp); |
| if (clp->cl_cb_conn.cb_xprt) |
| svc_xprt_put(clp->cl_cb_conn.cb_xprt); |
| list_del(&clp->cl_idhash); |
| list_del(&clp->cl_strhash); |
| spin_lock(&client_lock); |
| unhash_client_locked(clp); |
| if (atomic_read(&clp->cl_refcount) == 0) |
| free_client(clp); |
| spin_unlock(&client_lock); |
| } |
| |
| static void copy_verf(struct nfs4_client *target, nfs4_verifier *source) |
| { |
| memcpy(target->cl_verifier.data, source->data, |
| sizeof(target->cl_verifier.data)); |
| } |
| |
| static void copy_clid(struct nfs4_client *target, struct nfs4_client *source) |
| { |
| target->cl_clientid.cl_boot = source->cl_clientid.cl_boot; |
| target->cl_clientid.cl_id = source->cl_clientid.cl_id; |
| } |
| |
| static void copy_cred(struct svc_cred *target, struct svc_cred *source) |
| { |
| target->cr_uid = source->cr_uid; |
| target->cr_gid = source->cr_gid; |
| target->cr_group_info = source->cr_group_info; |
| get_group_info(target->cr_group_info); |
| } |
| |
| static int same_name(const char *n1, const char *n2) |
| { |
| return 0 == memcmp(n1, n2, HEXDIR_LEN); |
| } |
| |
| static int |
| same_verf(nfs4_verifier *v1, nfs4_verifier *v2) |
| { |
| return 0 == memcmp(v1->data, v2->data, sizeof(v1->data)); |
| } |
| |
| static int |
| same_clid(clientid_t *cl1, clientid_t *cl2) |
| { |
| return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id); |
| } |
| |
| /* XXX what about NGROUP */ |
| static int |
| same_creds(struct svc_cred *cr1, struct svc_cred *cr2) |
| { |
| return cr1->cr_uid == cr2->cr_uid; |
| } |
| |
| static void gen_clid(struct nfs4_client *clp) |
| { |
| static u32 current_clientid = 1; |
| |
| clp->cl_clientid.cl_boot = boot_time; |
| clp->cl_clientid.cl_id = current_clientid++; |
| } |
| |
| static void gen_confirm(struct nfs4_client *clp) |
| { |
| static u32 i; |
| u32 *p; |
| |
| p = (u32 *)clp->cl_confirm.data; |
| *p++ = get_seconds(); |
| *p++ = i++; |
| } |
| |
| static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir, |
| struct svc_rqst *rqstp, nfs4_verifier *verf) |
| { |
| struct nfs4_client *clp; |
| struct sockaddr *sa = svc_addr(rqstp); |
| char *princ; |
| |
| clp = alloc_client(name); |
| if (clp == NULL) |
| return NULL; |
| |
| INIT_LIST_HEAD(&clp->cl_sessions); |
| |
| princ = svc_gss_principal(rqstp); |
| if (princ) { |
| clp->cl_principal = kstrdup(princ, GFP_KERNEL); |
| if (clp->cl_principal == NULL) { |
| free_client(clp); |
| return NULL; |
| } |
| } |
| |
| memcpy(clp->cl_recdir, recdir, HEXDIR_LEN); |
| atomic_set(&clp->cl_refcount, 0); |
| atomic_set(&clp->cl_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); |
| spin_lock_init(&clp->cl_lock); |
| INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc); |
| clp->cl_time = get_seconds(); |
| clear_bit(0, &clp->cl_cb_slot_busy); |
| rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table"); |
| copy_verf(clp, verf); |
| rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa); |
| clp->cl_flavor = rqstp->rq_flavor; |
| copy_cred(&clp->cl_cred, &rqstp->rq_cred); |
| gen_confirm(clp); |
| clp->cl_cb_session = NULL; |
| return clp; |
| } |
| |
| static int check_name(struct xdr_netobj name) |
| { |
| if (name.len == 0) |
| return 0; |
| if (name.len > NFS4_OPAQUE_LIMIT) { |
| dprintk("NFSD: check_name: name too long(%d)!\n", name.len); |
| return 0; |
| } |
| return 1; |
| } |
| |
| static void |
| add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval) |
| { |
| unsigned int idhashval; |
| |
| list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]); |
| idhashval = clientid_hashval(clp->cl_clientid.cl_id); |
| list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]); |
| renew_client(clp); |
| } |
| |
| 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_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]); |
| strhashval = clientstr_hashval(clp->cl_recdir); |
| list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]); |
| renew_client(clp); |
| } |
| |
| static struct nfs4_client * |
| find_confirmed_client(clientid_t *clid) |
| { |
| struct nfs4_client *clp; |
| unsigned int idhashval = clientid_hashval(clid->cl_id); |
| |
| list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) { |
| if (same_clid(&clp->cl_clientid, clid)) |
| return clp; |
| } |
| return NULL; |
| } |
| |
| static struct nfs4_client * |
| find_unconfirmed_client(clientid_t *clid) |
| { |
| struct nfs4_client *clp; |
| unsigned int idhashval = clientid_hashval(clid->cl_id); |
| |
| list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) { |
| if (same_clid(&clp->cl_clientid, clid)) |
| return clp; |
| } |
| return NULL; |
| } |
| |
| /* |
| * Return 1 iff clp's clientid establishment method matches the use_exchange_id |
| * parameter. Matching is based on the fact the at least one of the |
| * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1 |
| * |
| * FIXME: we need to unify the clientid namespaces for nfsv4.x |
| * and correctly deal with client upgrade/downgrade in EXCHANGE_ID |
| * and SET_CLIENTID{,_CONFIRM} |
| */ |
| static inline int |
| match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id) |
| { |
| bool has_exchange_flags = (clp->cl_exchange_flags != 0); |
| return use_exchange_id == has_exchange_flags; |
| } |
| |
| static struct nfs4_client * |
| find_confirmed_client_by_str(const char *dname, unsigned int hashval, |
| bool use_exchange_id) |
| { |
| struct nfs4_client *clp; |
| |
| list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) { |
| if (same_name(clp->cl_recdir, dname) && |
| match_clientid_establishment(clp, use_exchange_id)) |
| return clp; |
| } |
| return NULL; |
| } |
| |
| static struct nfs4_client * |
| find_unconfirmed_client_by_str(const char *dname, unsigned int hashval, |
| bool use_exchange_id) |
| { |
| struct nfs4_client *clp; |
| |
| list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) { |
| if (same_name(clp->cl_recdir, dname) && |
| match_clientid_establishment(clp, use_exchange_id)) |
| return clp; |
| } |
| return NULL; |
| } |
| |
| static void |
| gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, u32 scopeid) |
| { |
| struct nfs4_cb_conn *conn = &clp->cl_cb_conn; |
| unsigned short expected_family; |
| |
| /* Currently, we only support tcp and tcp6 for the callback channel */ |
| if (se->se_callback_netid_len == 3 && |
| !memcmp(se->se_callback_netid_val, "tcp", 3)) |
| expected_family = AF_INET; |
| else if (se->se_callback_netid_len == 4 && |
| !memcmp(se->se_callback_netid_val, "tcp6", 4)) |
| expected_family = AF_INET6; |
| else |
| goto out_err; |
| |
| conn->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val, |
| se->se_callback_addr_len, |
| (struct sockaddr *)&conn->cb_addr, |
| sizeof(conn->cb_addr)); |
| |
| if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family) |
| goto out_err; |
| |
| if (conn->cb_addr.ss_family == AF_INET6) |
| ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid; |
| |
| conn->cb_prog = se->se_callback_prog; |
| conn->cb_ident = se->se_callback_ident; |
| return; |
| out_err: |
| conn->cb_addr.ss_family = AF_UNSPEC; |
| conn->cb_addrlen = 0; |
| dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) " |
| "will not receive delegations\n", |
| clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id); |
| |
| return; |
| } |
| |
| /* |
| * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size. |
| */ |
| void |
| nfsd4_store_cache_entry(struct nfsd4_compoundres *resp) |
| { |
| struct nfsd4_slot *slot = resp->cstate.slot; |
| unsigned int base; |
| |
| dprintk("--> %s slot %p\n", __func__, slot); |
| |
| slot->sl_opcnt = resp->opcnt; |
| slot->sl_status = resp->cstate.status; |
| |
| if (nfsd4_not_cached(resp)) { |
| slot->sl_datalen = 0; |
| return; |
| } |
| slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap; |
| base = (char *)resp->cstate.datap - |
| (char *)resp->xbuf->head[0].iov_base; |
| if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data, |
| slot->sl_datalen)) |
| WARN("%s: sessions DRC could not cache compound\n", __func__); |
| return; |
| } |
| |
| /* |
| * Encode the replay sequence operation from the slot values. |
| * If cachethis is FALSE encode the uncached rep error on the next |
| * operation which sets resp->p and increments resp->opcnt for |
| * nfs4svc_encode_compoundres. |
| * |
| */ |
| static __be32 |
| nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args, |
| struct nfsd4_compoundres *resp) |
| { |
| struct nfsd4_op *op; |
| struct nfsd4_slot *slot = resp->cstate.slot; |
| |
| dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__, |
| resp->opcnt, resp->cstate.slot->sl_cachethis); |
| |
| /* Encode the replayed sequence operation */ |
| op = &args->ops[resp->opcnt - 1]; |
| nfsd4_encode_operation(resp, op); |
| |
| /* Return nfserr_retry_uncached_rep in next operation. */ |
| if (args->opcnt > 1 && slot->sl_cachethis == 0) { |
| op = &args->ops[resp->opcnt++]; |
| op->status = nfserr_retry_uncached_rep; |
| nfsd4_encode_operation(resp, op); |
| } |
| return op->status; |
| } |
| |
| /* |
| * The sequence operation is not cached because we can use the slot and |
| * session values. |
| */ |
| __be32 |
| nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp, |
| struct nfsd4_sequence *seq) |
| { |
| struct nfsd4_slot *slot = resp->cstate.slot; |
| __be32 status; |
| |
| dprintk("--> %s slot %p\n", __func__, slot); |
| |
| /* Either returns 0 or nfserr_retry_uncached */ |
| status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp); |
| if (status == nfserr_retry_uncached_rep) |
| return status; |
| |
| /* The sequence operation has been encoded, cstate->datap set. */ |
| memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen); |
| |
| resp->opcnt = slot->sl_opcnt; |
| resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen); |
| status = slot->sl_status; |
| |
| return status; |
| } |
| |
| /* |
| * Set the exchange_id flags returned by the server. |
| */ |
| static void |
| nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid) |
| { |
| /* pNFS is not supported */ |
| new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS; |
| |
| /* Referrals are supported, Migration is not. */ |
| new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER; |
| |
| /* set the wire flags to return to client. */ |
| clid->flags = new->cl_exchange_flags; |
| } |
| |
| __be32 |
| nfsd4_exchange_id(struct svc_rqst *rqstp, |
| struct nfsd4_compound_state *cstate, |
| struct nfsd4_exchange_id *exid) |
| { |
| struct nfs4_client *unconf, *conf, *new; |
| int status; |
| unsigned int strhashval; |
| char dname[HEXDIR_LEN]; |
| char addr_str[INET6_ADDRSTRLEN]; |
| nfs4_verifier verf = exid->verifier; |
| struct sockaddr *sa = svc_addr(rqstp); |
| |
| rpc_ntop(sa, addr_str, sizeof(addr_str)); |
| dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p " |
| "ip_addr=%s flags %x, spa_how %d\n", |
| __func__, rqstp, exid, exid->clname.len, exid->clname.data, |
| addr_str, exid->flags, exid->spa_how); |
| |
| if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A)) |
| return nfserr_inval; |
| |
| /* Currently only support SP4_NONE */ |
| switch (exid->spa_how) { |
| case SP4_NONE: |
| break; |
| case SP4_SSV: |
| return nfserr_encr_alg_unsupp; |
| default: |
| BUG(); /* checked by xdr code */ |
| case SP4_MACH_CRED: |
| return nfserr_serverfault; /* no excuse :-/ */ |
| } |
| |
| status = nfs4_make_rec_clidname(dname, &exid->clname); |
| |
| if (status) |
| goto error; |
| |
| strhashval = clientstr_hashval(dname); |
| |
| nfs4_lock_state(); |
| status = nfs_ok; |
| |
| conf = find_confirmed_client_by_str(dname, strhashval, true); |
| if (conf) { |
| if (!same_verf(&verf, &conf->cl_verifier)) { |
| /* 18.35.4 case 8 */ |
| if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { |
| status = nfserr_not_same; |
| goto out; |
| } |
| /* Client reboot: destroy old state */ |
| expire_client(conf); |
| goto out_new; |
| } |
| if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { |
| /* 18.35.4 case 9 */ |
| if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { |
| status = nfserr_perm; |
| goto out; |
| } |
| expire_client(conf); |
| goto out_new; |
| } |
| /* |
| * Set bit when the owner id and verifier map to an already |
| * confirmed client id (18.35.3). |
| */ |
| exid->flags |= EXCHGID4_FLAG_CONFIRMED_R; |
| |
| /* |
| * Falling into 18.35.4 case 2, possible router replay. |
| * Leave confirmed record intact and return same result. |
| */ |
| copy_verf(conf, &verf); |
| new = conf; |
| goto out_copy; |
| } |
| |
| /* 18.35.4 case 7 */ |
| if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) { |
| status = nfserr_noent; |
| goto out; |
| } |
| |
| unconf = find_unconfirmed_client_by_str(dname, strhashval, true); |
| if (unconf) { |
| /* |
| * Possible retry or client restart. Per 18.35.4 case 4, |
| * a new unconfirmed record should be generated regardless |
| * of whether any properties have changed. |
| */ |
| expire_client(unconf); |
| } |
| |
| out_new: |
| /* Normal case */ |
| new = create_client(exid->clname, dname, rqstp, &verf); |
| if (new == NULL) { |
| status = nfserr_jukebox; |
| goto out; |
| } |
| |
| gen_clid(new); |
| add_to_unconfirmed(new, strhashval); |
| out_copy: |
| exid->clientid.cl_boot = new->cl_clientid.cl_boot; |
| exid->clientid.cl_id = new->cl_clientid.cl_id; |
| |
| exid->seqid = 1; |
| nfsd4_set_ex_flags(new, exid); |
| |
| dprintk("nfsd4_exchange_id seqid %d flags %x\n", |
| new->cl_cs_slot.sl_seqid, new->cl_exchange_flags); |
| status = nfs_ok; |
| |
| out: |
| nfs4_unlock_state(); |
| error: |
| dprintk("nfsd4_exchange_id returns %d\n", ntohl(status)); |
| return status; |
| } |
| |
| static int |
| check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse) |
| { |
| dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid, |
| slot_seqid); |
| |
| /* The slot is in use, and no response has been sent. */ |
| if (slot_inuse) { |
| if (seqid == slot_seqid) |
| return nfserr_jukebox; |
| else |
| return nfserr_seq_misordered; |
| } |
| /* Normal */ |
| if (likely(seqid == slot_seqid + 1)) |
| return nfs_ok; |
| /* Replay */ |
| if (seqid == slot_seqid) |
| return nfserr_replay_cache; |
| /* Wraparound */ |
| if (seqid == 1 && (slot_seqid + 1) == 0) |
| return nfs_ok; |
| /* Misordered replay or misordered new request */ |
| return nfserr_seq_misordered; |
| } |
| |
| /* |
| * Cache the create session result into the create session single DRC |
| * slot cache by saving the xdr structure. sl_seqid has been set. |
| * Do this for solo or embedded create session operations. |
| */ |
| static void |
| nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses, |
| struct nfsd4_clid_slot *slot, int nfserr) |
| { |
| slot->sl_status = nfserr; |
| memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses)); |
| } |
| |
| static __be32 |
| nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses, |
| struct nfsd4_clid_slot *slot) |
| { |
| memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses)); |
| return slot->sl_status; |
| } |
| |
| __be32 |
| nfsd4_create_session(struct svc_rqst *rqstp, |
| struct nfsd4_compound_state *cstate, |
| struct nfsd4_create_session *cr_ses) |
| { |
| struct sockaddr *sa = svc_addr(rqstp); |
| struct nfs4_client *conf, *unconf; |
| struct nfsd4_session *new; |
| struct nfsd4_clid_slot *cs_slot = NULL; |
| bool confirm_me = false; |
| int status = 0; |
| |
| nfs4_lock_state(); |
| unconf = find_unconfirmed_client(&cr_ses->clientid); |
| conf = find_confirmed_client(&cr_ses->clientid); |
| |
| if (conf) { |
| cs_slot = &conf->cl_cs_slot; |
| status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); |
| if (status == nfserr_replay_cache) { |
| dprintk("Got a create_session replay! seqid= %d\n", |
| cs_slot->sl_seqid); |
| /* Return the cached reply status */ |
| status = nfsd4_replay_create_session(cr_ses, cs_slot); |
| goto out; |
| } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) { |
| status = nfserr_seq_misordered; |
| dprintk("Sequence misordered!\n"); |
| dprintk("Expected seqid= %d but got seqid= %d\n", |
| cs_slot->sl_seqid, cr_ses->seqid); |
| goto out; |
| } |
| } else if (unconf) { |
| if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) || |
| !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) { |
| status = nfserr_clid_inuse; |
| goto out; |
| } |
| |
| cs_slot = &unconf->cl_cs_slot; |
| status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0); |
| if (status) { |
| /* an unconfirmed replay returns misordered */ |
| status = nfserr_seq_misordered; |
| goto out; |
| } |
| |
| confirm_me = true; |
| conf = unconf; |
| } else { |
| status = nfserr_stale_clientid; |
| goto out; |
| } |
| |
| /* |
| * XXX: we should probably set this at creation time, and check |
| * for consistent minorversion use throughout: |
| */ |
| conf->cl_minorversion = 1; |
| /* |
| * We do not support RDMA or persistent sessions |
| */ |
| cr_ses->flags &= ~SESSION4_PERSIST; |
| cr_ses->flags &= ~SESSION4_RDMA; |
| |
| status = nfserr_jukebox; |
| new = alloc_init_session(rqstp, conf, cr_ses); |
| if (!new) |
| goto out; |
| status = nfs_ok; |
| memcpy(cr_ses->sessionid.data, new->se_sessionid.data, |
| NFS4_MAX_SESSIONID_LEN); |
| cs_slot->sl_seqid++; |
| cr_ses->seqid = cs_slot->sl_seqid; |
| |
| /* cache solo and embedded create sessions under the state lock */ |
| nfsd4_cache_create_session(cr_ses, cs_slot, status); |
| if (confirm_me) |
| move_to_confirmed(conf); |
| out: |
| nfs4_unlock_state(); |
| dprintk("%s returns %d\n", __func__, ntohl(status)); |
| return status; |
| } |
| |
| static bool nfsd4_last_compound_op(struct svc_rqst *rqstp) |
| { |
| struct nfsd4_compoundres *resp = rqstp->rq_resp; |
| struct nfsd4_compoundargs *argp = rqstp->rq_argp; |
| |
| return argp->opcnt == resp->opcnt; |
| } |
| |
| static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid) |
| { |
| if (!session) |
| return 0; |
| return !memcmp(sid, &session->se_sessionid, sizeof(*sid)); |
| } |
| |
| __be32 |
| nfsd4_destroy_session(struct svc_rqst *r, |
| struct nfsd4_compound_state *cstate, |
| struct nfsd4_destroy_session *sessionid) |
| { |
| struct nfsd4_session *ses; |
| u32 status = nfserr_badsession; |
| |
| /* Notes: |
| * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid |
| * - Should we return nfserr_back_chan_busy if waiting for |
| * callbacks on to-be-destroyed session? |
| * - Do we need to clear any callback info from previous session? |
| */ |
| |
| if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) { |
| if (!nfsd4_last_compound_op(r)) |
| return nfserr_not_only_op; |
| } |
| dump_sessionid(__func__, &sessionid->sessionid); |
| spin_lock(&client_lock); |
| ses = find_in_sessionid_hashtbl(&sessionid->sessionid); |
| if (!ses) { |
| spin_unlock(&client_lock); |
| goto out; |
| } |
| |
| unhash_session(ses); |
| spin_unlock(&client_lock); |
| |
| nfs4_lock_state(); |
| /* wait for callbacks */ |
| nfsd4_shutdown_callback(ses->se_client); |
| nfs4_unlock_state(); |
| |
| nfsd4_del_conns(ses); |
| |
| nfsd4_put_session(ses); |
| status = nfs_ok; |
| out: |
| dprintk("%s returns %d\n", __func__, ntohl(status)); |
| return status; |
| } |
| |
| static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s) |
| { |
| struct nfsd4_conn *c; |
| |
| list_for_each_entry(c, &s->se_conns, cn_persession) { |
| if (c->cn_xprt == xpt) { |
| return c; |
| } |
| } |
| return NULL; |
| } |
| |
| static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses) |
| { |
| struct nfs4_client *clp = ses->se_client; |
| struct nfsd4_conn *c; |
| int ret; |
| |
| spin_lock(&clp->cl_lock); |
| c = __nfsd4_find_conn(new->cn_xprt, ses); |
| if (c) { |
| spin_unlock(&clp->cl_lock); |
| free_conn(new); |
| return; |
| } |
| __nfsd4_hash_conn(new, ses); |
| spin_unlock(&clp->cl_lock); |
| ret = nfsd4_register_conn(new); |
| if (ret) |
| /* oops; xprt is already down: */ |
| nfsd4_conn_lost(&new->cn_xpt_user); |
| return; |
| } |
| |
| __be32 |
| nfsd4_sequence(struct svc_rqst *rqstp, |
| struct nfsd4_compound_state *cstate, |
| struct nfsd4_sequence *seq) |
| { |
| struct nfsd4_compoundres *resp = rqstp->rq_resp; |
| struct nfsd4_session *session; |
| struct nfsd4_slot *slot; |
| struct nfsd4_conn *conn; |
| int status; |
| |
| if (resp->opcnt != 1) |
| return nfserr_sequence_pos; |
| |
| /* |
| * Will be either used or freed by nfsd4_sequence_check_conn |
| * below. |
| */ |
| conn = alloc_conn(rqstp, NFS4_CDFC4_FORE); |
| if (!conn) |
| return nfserr_jukebox; |
| |
| spin_lock(&client_lock); |
| status = nfserr_badsession; |
| session = find_in_sessionid_hashtbl(&seq->sessionid); |
| if (!session) |
| goto out; |
| |
| status = nfserr_badslot; |
| if (seq->slotid >= session->se_fchannel.maxreqs) |
| goto out; |
| |
| slot = session->se_slots[seq->slotid]; |
| dprintk("%s: slotid %d\n", __func__, seq->slotid); |
| |
| /* We do not negotiate the number of slots yet, so set the |
| * maxslots to the session maxreqs which is used to encode |
| * sr_highest_slotid and the sr_target_slot id to maxslots */ |
| seq->maxslots = session->se_fchannel.maxreqs; |
| |
| status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse); |
| if (status == nfserr_replay_cache) { |
| cstate->slot = slot; |
| cstate->session = session; |
| /* Return the cached reply status and set cstate->status |
| * for nfsd4_proc_compound processing */ |
| status = nfsd4_replay_cache_entry(resp, seq); |
| cstate->status = nfserr_replay_cache; |
| goto out; |
| } |
| if (status) |
| goto out; |
| |
| nfsd4_sequence_check_conn(conn, session); |
| conn = NULL; |
| |
| /* Success! bump slot seqid */ |
| slot->sl_inuse = true; |
| slot->sl_seqid = seq->seqid; |
| slot->sl_cachethis = seq->cachethis; |
| |
| cstate->slot = slot; |
| cstate->session = session; |
| |
| out: |
| /* Hold a session reference until done processing the compound. */ |
| if (cstate->session) { |
| nfsd4_get_session(cstate->session); |
| atomic_inc(&session->se_client->cl_refcount); |
| } |
| kfree(conn); |
| spin_unlock(&client_lock); |
| dprintk("%s: return %d\n", __func__, ntohl(status)); |
| return status; |
| } |
| |
| __be32 |
| nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc) |
| { |
| if (rc->rca_one_fs) { |
| if (!cstate->current_fh.fh_dentry) |
| return nfserr_nofilehandle; |
| /* |
| * We don't take advantage of the rca_one_fs case. |
| * That's OK, it's optional, we can safely ignore it. |
| */ |
| return nfs_ok; |
| } |
| nfs4_lock_state(); |
| if (is_client_expired(cstate->session->se_client)) { |
| nfs4_unlock_state(); |
| /* |
| * The following error isn't really legal. |
| * But we only get here if the client just explicitly |
| * destroyed the client. Surely it no longer cares what |
| * error it gets back on an operation for the dead |
| * client. |
| */ |
| return nfserr_stale_clientid; |
| } |
| nfsd4_create_clid_dir(cstate->session->se_client); |
| nfs4_unlock_state(); |
| return nfs_ok; |
| } |
| |
| __be32 |
| nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| struct nfsd4_setclientid *setclid) |
| { |
| struct sockaddr *sa = svc_addr(rqstp); |
| struct xdr_netobj clname = { |
| .len = setclid->se_namelen, |
| .data = setclid->se_name, |
| }; |
| nfs4_verifier clverifier = setclid->se_verf; |
| unsigned int strhashval; |
| struct nfs4_client *conf, *unconf, *new; |
| __be32 status; |
| char dname[HEXDIR_LEN]; |
| |
| if (!check_name(clname)) |
| return nfserr_inval; |
| |
| status = nfs4_make_rec_clidname(dname, &clname); |
| if (status) |
| return status; |
| |
| /* |
| * XXX The Duplicate Request Cache (DRC) has been checked (??) |
| * We get here on a DRC miss. |
| */ |
| |
| strhashval = clientstr_hashval(dname); |
| |
| nfs4_lock_state(); |
| conf = find_confirmed_client_by_str(dname, strhashval, false); |
| if (conf) { |
| /* RFC 3530 14.2.33 CASE 0: */ |
| status = nfserr_clid_inuse; |
| if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) { |
| char addr_str[INET6_ADDRSTRLEN]; |
| rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str, |
| sizeof(addr_str)); |
| dprintk("NFSD: setclientid: string in use by client " |
| "at %s\n", addr_str); |
| goto out; |
| } |
| } |
| /* |
| * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION") |
| * has a description of SETCLIENTID request processing consisting |
| * of 5 bullet points, labeled as CASE0 - CASE4 below. |
| */ |
| unconf = find_unconfirmed_client_by_str(dname, strhashval, false); |
| status = nfserr_resource; |
| if (!conf) { |
| /* |
| * RFC 3530 14.2.33 CASE 4: |
| * placed first, because it is the normal case |
| */ |
| if (unconf) |
| expire_client(unconf); |
| new = create_client(clname, dname, rqstp, &clverifier); |
| if (new == NULL) |
| goto out; |
| gen_clid(new); |
| } else if (same_verf(&conf->cl_verifier, &clverifier)) { |
| /* |
| * RFC 3530 14.2.33 CASE 1: |
| * probable callback update |
| */ |
| if (unconf) { |
| /* Note this is removing unconfirmed {*x***}, |
| * which is stronger than RFC recommended {vxc**}. |
| * This has the advantage that there is at most |
| * one {*x***} in either list at any time. |
| */ |
| expire_client(unconf); |
| } |
| new = create_client(clname, dname, rqstp, &clverifier); |
| if (new == NULL) |
| goto out; |
| copy_clid(new, conf); |
| } else if (!unconf) { |
| /* |
| * RFC 3530 14.2.33 CASE 2: |
| * probable client reboot; state will be removed if |
| * confirmed. |
| */ |
| new = create_client(clname, dname, rqstp, &clverifier); |
| if (new == NULL) |
| goto out; |
| gen_clid(new); |
| } else { |
| /* |
| * RFC 3530 14.2.33 CASE 3: |
| * probable client reboot; state will be removed if |
| * confirmed. |
| */ |
| expire_client(unconf); |
| new = create_client(clname, dname, rqstp, &clverifier); |
| if (new == NULL) |
| goto out; |
| gen_clid(new); |
| } |
| /* |
| * XXX: we should probably set this at creation time, and check |
| * for consistent minorversion use throughout: |
| */ |
| new->cl_minorversion = 0; |
| gen_callback(new, setclid, rpc_get_scope_id(sa)); |
| add_to_unconfirmed(new, strhashval); |
| setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot; |
| setclid->se_clientid.cl_id = new->cl_clientid.cl_id; |
| memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data)); |
| status = nfs_ok; |
| out: |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| |
| /* |
| * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has |
| * a description of SETCLIENTID_CONFIRM request processing consisting of 4 |
| * bullets, labeled as CASE1 - CASE4 below. |
| */ |
| __be32 |
| nfsd4_setclientid_confirm(struct svc_rqst *rqstp, |
| struct nfsd4_compound_state *cstate, |
| struct nfsd4_setclientid_confirm *setclientid_confirm) |
| { |
| struct sockaddr *sa = svc_addr(rqstp); |
| struct nfs4_client *conf, *unconf; |
| nfs4_verifier confirm = setclientid_confirm->sc_confirm; |
| clientid_t * clid = &setclientid_confirm->sc_clientid; |
| __be32 status; |
| |
| if (STALE_CLIENTID(clid)) |
| return nfserr_stale_clientid; |
| /* |
| * XXX The Duplicate Request Cache (DRC) has been checked (??) |
| * We get here on a DRC miss. |
| */ |
| |
| nfs4_lock_state(); |
| |
| conf = find_confirmed_client(clid); |
| unconf = find_unconfirmed_client(clid); |
| |
| status = nfserr_clid_inuse; |
| if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa)) |
| goto out; |
| if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa)) |
| goto out; |
| |
| /* |
| * section 14.2.34 of RFC 3530 has a description of |
| * SETCLIENTID_CONFIRM request processing consisting |
| * of 4 bullet points, labeled as CASE1 - CASE4 below. |
| */ |
| if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) { |
| /* |
| * RFC 3530 14.2.34 CASE 1: |
| * callback update |
| */ |
| if (!same_creds(&conf->cl_cred, &unconf->cl_cred)) |
| status = nfserr_clid_inuse; |
| else { |
| atomic_set(&conf->cl_cb_set, 0); |
| nfsd4_change_callback(conf, &unconf->cl_cb_conn); |
| nfsd4_probe_callback(conf); |
| expire_client(unconf); |
| status = nfs_ok; |
| |
| } |
| } else if (conf && !unconf) { |
| /* |
| * RFC 3530 14.2.34 CASE 2: |
| * probable retransmitted request; play it safe and |
| * do nothing. |
| */ |
| if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) |
| status = nfserr_clid_inuse; |
| else |
| status = nfs_ok; |
| } else if (!conf && unconf |
| && same_verf(&unconf->cl_confirm, &confirm)) { |
| /* |
| * RFC 3530 14.2.34 CASE 3: |
| * Normal case; new or rebooted client: |
| */ |
| if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) { |
| status = nfserr_clid_inuse; |
| } else { |
| unsigned int hash = |
| clientstr_hashval(unconf->cl_recdir); |
| conf = find_confirmed_client_by_str(unconf->cl_recdir, |
| hash, false); |
| if (conf) { |
| nfsd4_remove_clid_dir(conf); |
| expire_client(conf); |
| } |
| move_to_confirmed(unconf); |
| conf = unconf; |
| nfsd4_probe_callback(conf); |
| status = nfs_ok; |
| } |
| } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm))) |
| && (!unconf || (unconf && !same_verf(&unconf->cl_confirm, |
| &confirm)))) { |
| /* |
| * RFC 3530 14.2.34 CASE 4: |
| * Client probably hasn't noticed that we rebooted yet. |
| */ |
| status = nfserr_stale_clientid; |
| } else { |
| /* check that we have hit one of the cases...*/ |
| status = nfserr_clid_inuse; |
| } |
| out: |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| /* OPEN Share state helper functions */ |
| static inline struct nfs4_file * |
| alloc_init_file(struct inode *ino) |
| { |
| struct nfs4_file *fp; |
| unsigned int hashval = file_hashval(ino); |
| |
| fp = kmem_cache_alloc(file_slab, GFP_KERNEL); |
| if (fp) { |
| atomic_set(&fp->fi_ref, 1); |
| INIT_LIST_HEAD(&fp->fi_hash); |
| INIT_LIST_HEAD(&fp->fi_stateids); |
| INIT_LIST_HEAD(&fp->fi_delegations); |
| fp->fi_inode = igrab(ino); |
| fp->fi_id = current_fileid++; |
| fp->fi_had_conflict = false; |
| memset(fp->fi_fds, 0, sizeof(fp->fi_fds)); |
| memset(fp->fi_access, 0, sizeof(fp->fi_access)); |
| spin_lock(&recall_lock); |
| list_add(&fp->fi_hash, &file_hashtbl[hashval]); |
| spin_unlock(&recall_lock); |
| return fp; |
| } |
| return NULL; |
| } |
| |
| static void |
| nfsd4_free_slab(struct kmem_cache **slab) |
| { |
| if (*slab == NULL) |
| return; |
| kmem_cache_destroy(*slab); |
| *slab = NULL; |
| } |
| |
| void |
| nfsd4_free_slabs(void) |
| { |
| nfsd4_free_slab(&stateowner_slab); |
| nfsd4_free_slab(&file_slab); |
| nfsd4_free_slab(&stateid_slab); |
| nfsd4_free_slab(&deleg_slab); |
| } |
| |
| static int |
| nfsd4_init_slabs(void) |
| { |
| stateowner_slab = kmem_cache_create("nfsd4_stateowners", |
| sizeof(struct nfs4_stateowner), 0, 0, NULL); |
| if (stateowner_slab == NULL) |
| goto out_nomem; |
| file_slab = kmem_cache_create("nfsd4_files", |
| sizeof(struct nfs4_file), 0, 0, NULL); |
| if (file_slab == NULL) |
| goto out_nomem; |
| stateid_slab = kmem_cache_create("nfsd4_stateids", |
| sizeof(struct nfs4_stateid), 0, 0, NULL); |
| if (stateid_slab == NULL) |
| goto out_nomem; |
| deleg_slab = kmem_cache_create("nfsd4_delegations", |
| sizeof(struct nfs4_delegation), 0, 0, NULL); |
| if (deleg_slab == NULL) |
| goto out_nomem; |
| return 0; |
| out_nomem: |
| nfsd4_free_slabs(); |
| dprintk("nfsd4: out of memory while initializing nfsv4\n"); |
| return -ENOMEM; |
| } |
| |
| void |
| nfs4_free_stateowner(struct kref *kref) |
| { |
| struct nfs4_stateowner *sop = |
| container_of(kref, struct nfs4_stateowner, so_ref); |
| kfree(sop->so_owner.data); |
| kmem_cache_free(stateowner_slab, sop); |
| } |
| |
| static inline struct nfs4_stateowner * |
| alloc_stateowner(struct xdr_netobj *owner) |
| { |
| struct nfs4_stateowner *sop; |
| |
| if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) { |
| if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) { |
| memcpy(sop->so_owner.data, owner->data, owner->len); |
| sop->so_owner.len = owner->len; |
| kref_init(&sop->so_ref); |
| return sop; |
| } |
| kmem_cache_free(stateowner_slab, sop); |
| } |
| return NULL; |
| } |
| |
| static struct nfs4_stateowner * |
| alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) { |
| struct nfs4_stateowner *sop; |
| struct nfs4_replay *rp; |
| unsigned int idhashval; |
| |
| if (!(sop = alloc_stateowner(&open->op_owner))) |
| return NULL; |
| idhashval = ownerid_hashval(current_ownerid); |
| INIT_LIST_HEAD(&sop->so_idhash); |
| INIT_LIST_HEAD(&sop->so_strhash); |
| INIT_LIST_HEAD(&sop->so_perclient); |
| INIT_LIST_HEAD(&sop->so_stateids); |
| INIT_LIST_HEAD(&sop->so_perstateid); /* not used */ |
| INIT_LIST_HEAD(&sop->so_close_lru); |
| sop->so_time = 0; |
| list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]); |
| list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]); |
| list_add(&sop->so_perclient, &clp->cl_openowners); |
| sop->so_is_open_owner = 1; |
| sop->so_id = current_ownerid++; |
| sop->so_client = clp; |
| sop->so_seqid = open->op_seqid; |
| sop->so_confirmed = 0; |
| rp = &sop->so_replay; |
| rp->rp_status = nfserr_serverfault; |
| rp->rp_buflen = 0; |
| rp->rp_buf = rp->rp_ibuf; |
| return sop; |
| } |
| |
| static inline void |
| init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) { |
| struct nfs4_stateowner *sop = open->op_stateowner; |
| unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); |
| |
| INIT_LIST_HEAD(&stp->st_hash); |
| INIT_LIST_HEAD(&stp->st_perstateowner); |
| INIT_LIST_HEAD(&stp->st_lockowners); |
| INIT_LIST_HEAD(&stp->st_perfile); |
| list_add(&stp->st_hash, &stateid_hashtbl[hashval]); |
| list_add(&stp->st_perstateowner, &sop->so_stateids); |
| list_add(&stp->st_perfile, &fp->fi_stateids); |
| stp->st_stateowner = sop; |
| get_nfs4_file(fp); |
| stp->st_file = fp; |
| stp->st_stateid.si_boot = 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 & ~NFS4_SHARE_WANT_MASK, |
| &stp->st_access_bmap); |
| __set_bit(open->op_share_deny, &stp->st_deny_bmap); |
| stp->st_openstp = NULL; |
| } |
| |
| static void |
| move_to_close_lru(struct nfs4_stateowner *sop) |
| { |
| dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop); |
| |
| list_move_tail(&sop->so_close_lru, &close_lru); |
| sop->so_time = get_seconds(); |
| } |
| |
| static int |
| same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, |
| clientid_t *clid) |
| { |
| return (sop->so_owner.len == owner->len) && |
| 0 == memcmp(sop->so_owner.data, owner->data, owner->len) && |
| (sop->so_client->cl_clientid.cl_id == clid->cl_id); |
| } |
| |
| static struct nfs4_stateowner * |
| find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open) |
| { |
| struct nfs4_stateowner *so = NULL; |
| |
| list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) { |
| if (same_owner_str(so, &open->op_owner, &open->op_clientid)) |
| return so; |
| } |
| return NULL; |
| } |
| |
| /* search file_hashtbl[] for file */ |
| static struct nfs4_file * |
| find_file(struct inode *ino) |
| { |
| unsigned int hashval = file_hashval(ino); |
| struct nfs4_file *fp; |
| |
| spin_lock(&recall_lock); |
| list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) { |
| if (fp->fi_inode == ino) { |
| get_nfs4_file(fp); |
| spin_unlock(&recall_lock); |
| return fp; |
| } |
| } |
| spin_unlock(&recall_lock); |
| return NULL; |
| } |
| |
| static inline int access_valid(u32 x, u32 minorversion) |
| { |
| if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ) |
| return 0; |
| if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH) |
| return 0; |
| x &= ~NFS4_SHARE_ACCESS_MASK; |
| if (minorversion && x) { |
| if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL) |
| return 0; |
| if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED) |
| return 0; |
| x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK); |
| } |
| if (x) |
| return 0; |
| return 1; |
| } |
| |
| static inline int deny_valid(u32 x) |
| { |
| /* Note: unlike access bits, deny bits may be zero. */ |
| return x <= NFS4_SHARE_DENY_BOTH; |
| } |
| |
| /* |
| * Called to check deny when READ with all zero stateid or |
| * WRITE with all zero or all one stateid |
| */ |
| static __be32 |
| nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type) |
| { |
| struct inode *ino = current_fh->fh_dentry->d_inode; |
| struct nfs4_file *fp; |
| struct nfs4_stateid *stp; |
| __be32 ret; |
| |
| dprintk("NFSD: nfs4_share_conflict\n"); |
| |
| fp = find_file(ino); |
| if (!fp) |
| return nfs_ok; |
| ret = nfserr_locked; |
| /* Search for conflicting share reservations */ |
| list_for_each_entry(stp, &fp->fi_stateids, st_perfile) { |
| if (test_bit(deny_type, &stp->st_deny_bmap) || |
| test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap)) |
| goto out; |
| } |
| ret = nfs_ok; |
| out: |
| put_nfs4_file(fp); |
| return ret; |
| } |
| |
| static inline void |
| nfs4_file_downgrade(struct nfs4_file *fp, unsigned int share_access) |
| { |
| if (share_access & NFS4_SHARE_ACCESS_WRITE) |
| nfs4_file_put_access(fp, O_WRONLY); |
| if (share_access & NFS4_SHARE_ACCESS_READ) |
| nfs4_file_put_access(fp, O_RDONLY); |
| } |
| |
| /* |
| * Spawn a thread to perform a recall on the delegation represented |
| * by the lease (file_lock) |
| * |
| * Called from break_lease() with lock_flocks() held. |
| * Note: we assume break_lease will only call this *once* for any given |
| * lease. |
| */ |
| static |
| void nfsd_break_deleg_cb(struct file_lock *fl) |
| { |
| struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner; |
| |
| dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl); |
| if (!dp) |
| return; |
| |
| /* We're assuming the state code never drops its reference |
| * without first removing the lease. Since we're in this lease |
| * callback (and since the lease code is serialized by the kernel |
| * lock) we know the server hasn't removed the lease yet, we know |
| * it's safe to take a reference: */ |
| atomic_inc(&dp->dl_count); |
| |
| 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_flocks*/ |
| dp->dl_time = get_seconds(); |
| |
| /* |
| * We don't want the locks code to timeout the lease for us; |
| * we'll remove it ourself if the delegation isn't returned |
| * in time. |
| */ |
| fl->fl_break_time = 0; |
| |
| dp->dl_file->fi_had_conflict = true; |
| nfsd4_cb_recall(dp); |
| } |
| |
| /* |
| * The file_lock is being reapd. |
| * |
| * Called by locks_free_lock() with lock_flocks() 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; |
| } |
| |
| /* |
| * Called from setlease() with lock_flocks() held |
| */ |
| static |
| int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try) |
| { |
| struct nfs4_delegation *onlistd = |
| (struct nfs4_delegation *)onlist->fl_owner; |
| struct nfs4_delegation *tryd = |
| (struct nfs4_delegation *)try->fl_owner; |
| |
| if (onlist->fl_lmops != try->fl_lmops) |
| return 0; |
| |
| return onlistd->dl_client == tryd->dl_client; |
| } |
| |
| |
| static |
| int nfsd_change_deleg_cb(struct file_lock **onlist, int arg) |
| { |
| if (arg & F_UNLCK) |
| return lease_modify(onlist, arg); |
| else |
| return -EAGAIN; |
| } |
| |
| static const struct lock_manager_operations nfsd_lease_mng_ops = { |
| .fl_break = nfsd_break_deleg_cb, |
| .fl_release_private = nfsd_release_deleg_cb, |
| .fl_mylease = nfsd_same_client_deleg_cb, |
| .fl_change = nfsd_change_deleg_cb, |
| }; |
| |
| |
| __be32 |
| nfsd4_process_open1(struct nfsd4_compound_state *cstate, |
| struct nfsd4_open *open) |
| { |
| clientid_t *clientid = &open->op_clientid; |
| struct nfs4_client *clp = NULL; |
| unsigned int strhashval; |
| struct nfs4_stateowner *sop = NULL; |
| |
| if (!check_name(open->op_owner)) |
| return nfserr_inval; |
| |
| if (STALE_CLIENTID(&open->op_clientid)) |
| return nfserr_stale_clientid; |
| |
| strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner); |
| sop = find_openstateowner_str(strhashval, open); |
| open->op_stateowner = sop; |
| if (!sop) { |
| /* Make sure the client's lease hasn't expired. */ |
| clp = find_confirmed_client(clientid); |
| if (clp == NULL) |
| return nfserr_expired; |
| goto renew; |
| } |
| /* When sessions are used, skip open sequenceid processing */ |
| if (nfsd4_has_session(cstate)) |
| goto renew; |
| if (!sop->so_confirmed) { |
| /* Replace unconfirmed owners without checking for replay. */ |
| clp = sop->so_client; |
| release_openowner(sop); |
| open->op_stateowner = NULL; |
| goto renew; |
| } |
| if (open->op_seqid == sop->so_seqid - 1) { |
| if (sop->so_replay.rp_buflen) |
| return nfserr_replay_me; |
| /* The original OPEN failed so spectacularly |
| * that we don't even have replay data saved! |
| * Therefore, we have no choice but to continue |
| * processing this OPEN; presumably, we'll |
| * fail again for the same reason. |
| */ |
| dprintk("nfsd4_process_open1: replay with no replay cache\n"); |
| goto renew; |
| } |
| if (open->op_seqid != sop->so_seqid) |
| return nfserr_bad_seqid; |
| renew: |
| if (open->op_stateowner == NULL) { |
| sop = alloc_init_open_stateowner(strhashval, clp, open); |
| if (sop == NULL) |
| return nfserr_resource; |
| open->op_stateowner = sop; |
| } |
| list_del_init(&sop->so_close_lru); |
| renew_client(sop->so_client); |
| return nfs_ok; |
| } |
| |
| static inline __be32 |
| nfs4_check_delegmode(struct nfs4_delegation *dp, int flags) |
| { |
| if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ)) |
| return nfserr_openmode; |
| else |
| return nfs_ok; |
| } |
| |
| static struct nfs4_delegation * |
| find_delegation_file(struct nfs4_file *fp, stateid_t *stid) |
| { |
| struct nfs4_delegation *dp; |
| |
| list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) { |
| if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid) |
| return dp; |
| } |
| return NULL; |
| } |
| |
| int share_access_to_flags(u32 share_access) |
| { |
| share_access &= ~NFS4_SHARE_WANT_MASK; |
| |
| return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE; |
| } |
| |
| static __be32 |
| nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open, |
| struct nfs4_delegation **dp) |
| { |
| int flags; |
| __be32 status = nfserr_bad_stateid; |
| |
| *dp = find_delegation_file(fp, &open->op_delegate_stateid); |
| if (*dp == NULL) |
| goto out; |
| flags = share_access_to_flags(open->op_share_access); |
| status = nfs4_check_delegmode(*dp, flags); |
| if (status) |
| *dp = NULL; |
| out: |
| if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR) |
| return nfs_ok; |
| if (status) |
| return status; |
| open->op_stateowner->so_confirmed = 1; |
| return nfs_ok; |
| } |
| |
| static __be32 |
| nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp) |
| { |
| struct nfs4_stateid *local; |
| __be32 status = nfserr_share_denied; |
| struct nfs4_stateowner *sop = open->op_stateowner; |
| |
| list_for_each_entry(local, &fp->fi_stateids, st_perfile) { |
| /* ignore lock owners */ |
| if (local->st_stateowner->so_is_open_owner == 0) |
| continue; |
| /* remember if we have seen this open owner */ |
| if (local->st_stateowner == sop) |
| *stpp = local; |
| /* check for conflicting share reservations */ |
| if (!test_share(local, open)) |
| goto out; |
| } |
| status = 0; |
| out: |
| return status; |
| } |
| |
| static inline struct nfs4_stateid * |
| nfs4_alloc_stateid(void) |
| { |
| return kmem_cache_alloc(stateid_slab, GFP_KERNEL); |
| } |
| |
| static inline int nfs4_access_to_access(u32 nfs4_access) |
| { |
| int flags = 0; |
| |
| if (nfs4_access & NFS4_SHARE_ACCESS_READ) |
| flags |= NFSD_MAY_READ; |
| if (nfs4_access & NFS4_SHARE_ACCESS_WRITE) |
| flags |= NFSD_MAY_WRITE; |
| return flags; |
| } |
| |
| static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file |
| *fp, struct svc_fh *cur_fh, u32 nfs4_access) |
| { |
| __be32 status; |
| int oflag = nfs4_access_to_omode(nfs4_access); |
| int access = nfs4_access_to_access(nfs4_access); |
| |
| if (!fp->fi_fds[oflag]) { |
| status = nfsd_open(rqstp, cur_fh, S_IFREG, access, |
| &fp->fi_fds[oflag]); |
| if (status == nfserr_dropit) |
| status = nfserr_jukebox; |
| if (status) |
| return status; |
| } |
| nfs4_file_get_access(fp, oflag); |
| |
| return nfs_ok; |
| } |
| |
| static __be32 |
| nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp, |
| struct nfs4_file *fp, struct svc_fh *cur_fh, |
| struct nfsd4_open *open) |
| { |
| struct nfs4_stateid *stp; |
| __be32 status; |
| |
| stp = nfs4_alloc_stateid(); |
| if (stp == NULL) |
| return nfserr_resource; |
| |
| status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open->op_share_access); |
| if (status) { |
| kmem_cache_free(stateid_slab, stp); |
| return status; |
| } |
| *stpp = stp; |
| return 0; |
| } |
| |
| static inline __be32 |
| nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh, |
| struct nfsd4_open *open) |
| { |
| struct iattr iattr = { |
| .ia_valid = ATTR_SIZE, |
| .ia_size = 0, |
| }; |
| if (!open->op_truncate) |
| return 0; |
| if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE)) |
| return nfserr_inval; |
| return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0); |
| } |
| |
| static __be32 |
| nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open) |
| { |
| u32 op_share_access = open->op_share_access & ~NFS4_SHARE_WANT_MASK; |
| bool new_access; |
| __be32 status; |
| |
| new_access = !test_bit(op_share_access, &stp->st_access_bmap); |
| if (new_access) { |
| status = nfs4_get_vfs_file(rqstp, fp, cur_fh, op_share_access); |
| if (status) |
| return status; |
| } |
| status = nfsd4_truncate(rqstp, cur_fh, open); |
| if (status) { |
| if (new_access) { |
| int oflag = nfs4_access_to_omode(new_access); |
| nfs4_file_put_access(fp, oflag); |
| } |
| return status; |
| } |
| /* remember the open */ |
| __set_bit(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; |
| int cb_up = atomic_read(&sop->so_client->cl_cb_set); |
| struct file_lock *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 (!cb_up) |
| open->op_recall = 1; |
| flag = open->op_delegate_type; |
| if (flag == NFS4_OPEN_DELEGATE_NONE) |
| goto out; |
| break; |
| case NFS4_OPEN_CLAIM_NULL: |
| /* Let's not give out any delegations till everyone's |
| * had the chance to reclaim theirs.... */ |
| if (locks_in_grace()) |
| goto out; |
| if (!cb_up || !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; |
| } |
| status = -ENOMEM; |
| fl = locks_alloc_lock(); |
| if (!fl) |
| goto out; |
| locks_init_lock(fl); |
| fl->fl_lmops = &nfsd_lease_mng_ops; |
| fl->fl_flags = FL_LEASE; |
| fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK; |
| fl->fl_end = OFFSET_MAX; |
| fl->fl_owner = (fl_owner_t)dp; |
| fl->fl_file = find_readable_file(stp->st_file); |
| BUG_ON(!fl->fl_file); |
| fl->fl_pid = current->tgid; |
| dp->dl_flock = fl; |
| |
| /* vfs_setlease checks to see if delegation should be handed out. |
| * the lock_manager callbacks fl_mylease and fl_change are used |
| */ |
| if ((status = vfs_setlease(fl->fl_file, fl->fl_type, &fl))) { |
| dprintk("NFSD: setlease failed [%d], no delegation\n", status); |
| dp->dl_flock = NULL; |
| locks_free_lock(fl); |
| 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=" STATEID_FMT "\n", |
| STATEID_VAL(&dp->dl_stateid)); |
| out: |
| if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS |
| && flag == NFS4_OPEN_DELEGATE_NONE |
| && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) |
| dprintk("NFSD: WARNING: refusing delegation reclaim\n"); |
| open->op_delegate_type = flag; |
| } |
| |
| /* |
| * called with nfs4_lock_state() held. |
| */ |
| __be32 |
| nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open) |
| { |
| struct nfsd4_compoundres *resp = rqstp->rq_resp; |
| struct nfs4_file *fp = NULL; |
| struct inode *ino = current_fh->fh_dentry->d_inode; |
| struct nfs4_stateid *stp = NULL; |
| struct nfs4_delegation *dp = NULL; |
| __be32 status; |
| |
| status = nfserr_inval; |
| if (!access_valid(open->op_share_access, resp->cstate.minorversion) |
| || !deny_valid(open->op_share_deny)) |
| goto out; |
| /* |
| * Lookup file; if found, lookup stateid and check open request, |
| * and check for delegations in the process of being recalled. |
| * If not found, create the nfs4_file struct |
| */ |
| fp = find_file(ino); |
| if (fp) { |
| if ((status = nfs4_check_open(fp, open, &stp))) |
| goto out; |
| status = nfs4_check_deleg(fp, open, &dp); |
| if (status) |
| goto out; |
| } else { |
| status = nfserr_bad_stateid; |
| if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR) |
| goto out; |
| status = nfserr_resource; |
| fp = alloc_init_file(ino); |
| if (fp == NULL) |
| goto out; |
| } |
| |
| /* |
| * OPEN the file, or upgrade an existing OPEN. |
| * If truncate fails, the OPEN fails. |
| */ |
| if (stp) { |
| /* Stateid was found, this is an OPEN upgrade */ |
| status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open); |
| if (status) |
| goto out; |
| update_stateid(&stp->st_stateid); |
| } else { |
| status = nfs4_new_open(rqstp, &stp, fp, current_fh, open); |
| if (status) |
| goto out; |
| init_stateid(stp, fp, open); |
| status = nfsd4_truncate(rqstp, current_fh, open); |
| if (status) { |
| release_open_stateid(stp); |
| goto out; |
| } |
| if (nfsd4_has_session(&resp->cstate)) |
| update_stateid(&stp->st_stateid); |
| } |
| memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t)); |
| |
| if (nfsd4_has_session(&resp->cstate)) |
| open->op_stateowner->so_confirmed = 1; |
| |
| /* |
| * Attempt to hand out a delegation. No error return, because the |
| * OPEN succeeds even if we fail. |
| */ |
| nfs4_open_delegation(current_fh, open, stp); |
| |
| status = nfs_ok; |
| |
| dprintk("%s: stateid=" STATEID_FMT "\n", __func__, |
| STATEID_VAL(&stp->st_stateid)); |
| out: |
| if (fp) |
| put_nfs4_file(fp); |
| if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) |
| nfs4_set_claim_prev(open); |
| /* |
| * To finish the open response, we just need to set the rflags. |
| */ |
| open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX; |
| if (!open->op_stateowner->so_confirmed && |
| !nfsd4_has_session(&resp->cstate)) |
| open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM; |
| |
| return status; |
| } |
| |
| __be32 |
| nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| clientid_t *clid) |
| { |
| struct nfs4_client *clp; |
| __be32 status; |
| |
| nfs4_lock_state(); |
| dprintk("process_renew(%08x/%08x): starting\n", |
| clid->cl_boot, clid->cl_id); |
| status = nfserr_stale_clientid; |
| if (STALE_CLIENTID(clid)) |
| goto out; |
| clp = find_confirmed_client(clid); |
| status = nfserr_expired; |
| if (clp == NULL) { |
| /* We assume the client took too long to RENEW. */ |
| dprintk("nfsd4_renew: clientid not found!\n"); |
| goto out; |
| } |
| renew_client(clp); |
| status = nfserr_cb_path_down; |
| if (!list_empty(&clp->cl_delegations) |
| && !atomic_read(&clp->cl_cb_set)) |
| goto out; |
| status = nfs_ok; |
| out: |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| struct lock_manager nfsd4_manager = { |
| }; |
| |
| static void |
| nfsd4_end_grace(void) |
| { |
| dprintk("NFSD: end of grace period\n"); |
| nfsd4_recdir_purge_old(); |
| locks_end_grace(&nfsd4_manager); |
| /* |
| * Now that every NFSv4 client has had the chance to recover and |
| * to see the (possibly new, possibly shorter) lease time, we |
| * can safely set the next grace time to the current lease time: |
| */ |
| nfsd4_grace = nfsd4_lease; |
| } |
| |
| 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() - nfsd4_lease; |
| time_t t, clientid_val = nfsd4_lease; |
| time_t u, test_val = nfsd4_lease; |
| |
| nfs4_lock_state(); |
| |
| dprintk("NFSD: laundromat service - starting\n"); |
| if (locks_in_grace()) |
| nfsd4_end_grace(); |
| INIT_LIST_HEAD(&reaplist); |
| spin_lock(&client_lock); |
| 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; |
| } |
| if (atomic_read(&clp->cl_refcount)) { |
| dprintk("NFSD: client in use (clientid %08x)\n", |
| clp->cl_clientid.cl_id); |
| continue; |
| } |
| unhash_client_locked(clp); |
| list_add(&clp->cl_lru, &reaplist); |
| } |
| spin_unlock(&client_lock); |
| list_for_each_safe(pos, next, &reaplist) { |
| clp = list_entry(pos, struct nfs4_client, cl_lru); |
| dprintk("NFSD: purging unused client (clientid %08x)\n", |
| clp->cl_clientid.cl_id); |
| nfsd4_remove_clid_dir(clp); |
| expire_client(clp); |
| } |
| 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 = nfsd4_lease; |
| list_for_each_safe(pos, next, &close_lru) { |
| sop = list_entry(pos, struct nfs4_stateowner, so_close_lru); |
| if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) { |
| u = sop->so_time - cutoff; |
| if (test_val > u) |
| test_val = u; |
| break; |
| } |
| dprintk("NFSD: purging unused open stateowner (so_id %d)\n", |
| sop->so_id); |
| release_openowner(sop); |
| } |
| if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT) |
| clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT; |
| nfs4_unlock_state(); |
| return clientid_val; |
| } |
| |
| static struct workqueue_struct *laundry_wq; |
| static void laundromat_main(struct work_struct *); |
| static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main); |
| |
| static void |
| laundromat_main(struct work_struct *not_used) |
| { |
| time_t t; |
| |
| t = nfs4_laundromat(); |
| dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t); |
| queue_delayed_work(laundry_wq, &laundromat_work, t*HZ); |
| } |
| |
| static struct nfs4_stateowner * |
| search_close_lru(u32 st_id, int flags) |
| { |
| struct nfs4_stateowner *local = NULL; |
| |
| if (flags & CLOSE_STATE) { |
| list_for_each_entry(local, &close_lru, so_close_lru) { |
| if (local->so_id == st_id) |
| return local; |
| } |
| } |
| return NULL; |
| } |
| |
| static inline int |
| nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp) |
| { |
| return fhp->fh_dentry->d_inode != stp->st_file->fi_inode; |
| } |
| |
| static int |
| STALE_STATEID(stateid_t *stateid) |
| { |
| if (stateid->si_boot == boot_time) |
| return 0; |
| dprintk("NFSD: stale stateid " STATEID_FMT "!\n", |
| STATEID_VAL(stateid)); |
| 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 |
| __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags) |
| { |
| __be32 status = nfserr_openmode; |
| |
| /* For lock stateid's, we test the parent open, not the lock: */ |
| if (stp->st_openstp) |
| stp = stp->st_openstp; |
| if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap))) |
| goto out; |
| if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap))) |
| goto out; |
| status = nfs_ok; |
| out: |
| return status; |
| } |
| |
| static inline __be32 |
| check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags) |
| { |
| if (ONE_STATEID(stateid) && (flags & RD_STATE)) |
| return nfs_ok; |
| else if (locks_in_grace()) { |
| /* Answer in remaining cases depends on existance of |
| * conflicting state; so we must wait out the grace period. */ |
| return nfserr_grace; |
| } else if (flags & WR_STATE) |
| return nfs4_share_conflict(current_fh, |
| NFS4_SHARE_DENY_WRITE); |
| else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */ |
| return nfs4_share_conflict(current_fh, |
| NFS4_SHARE_DENY_READ); |
| } |
| |
| /* |
| * Allow READ/WRITE during grace period on recovered state only for files |
| * that are not able to provide mandatory locking. |
| */ |
| static inline int |
| grace_disallows_io(struct inode *inode) |
| { |
| return locks_in_grace() && mandatory_lock(inode); |
| } |
| |
| static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags) |
| { |
| /* |
| * When sessions are used the stateid generation number is ignored |
| * when it is zero. |
| */ |
| if ((flags & HAS_SESSION) && in->si_generation == 0) |
| goto out; |
| |
| /* If the client sends us a stateid from the future, it's buggy: */ |
| if (in->si_generation > ref->si_generation) |
| return nfserr_bad_stateid; |
| /* |
| * The following, however, can happen. For example, if the |
| * client sends an open and some IO at the same time, the open |
| * may bump si_generation while the IO is still in flight. |
| * Thanks to hard links and renames, the client never knows what |
| * file an open will affect. So it could avoid that situation |
| * only by serializing all opens and IO from the same open |
| * owner. To recover from the old_stateid error, the client |
| * will just have to retry the IO: |
| */ |
| if (in->si_generation < ref->si_generation) |
| return nfserr_old_stateid; |
| out: |
| return nfs_ok; |
| } |
| |
| static int is_delegation_stateid(stateid_t *stateid) |
| { |
| return stateid->si_fileid == 0; |
| } |
| |
| /* |
| * Checks for stateid operations |
| */ |
| __be32 |
| nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate, |
| stateid_t *stateid, int flags, struct file **filpp) |
| { |
| struct nfs4_stateid *stp = NULL; |
| struct nfs4_delegation *dp = NULL; |
| struct svc_fh *current_fh = &cstate->current_fh; |
| struct inode *ino = current_fh->fh_dentry->d_inode; |
| __be32 status; |
| |
| if (filpp) |
| *filpp = NULL; |
| |
| if (grace_disallows_io(ino)) |
| return nfserr_grace; |
| |
| if (nfsd4_has_session(cstate)) |
| flags |= HAS_SESSION; |
| |
| if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) |
| return check_special_stateids(current_fh, stateid, flags); |
| |
| status = nfserr_stale_stateid; |
| if (STALE_STATEID(stateid)) |
| goto out; |
| |
| /* |
| * We assume that any stateid that has the current boot time, |
| * but that we can't find, is expired: |
| */ |
| status = nfserr_expired; |
| if (is_delegation_stateid(stateid)) { |
| dp = find_delegation_stateid(ino, stateid); |
| if (!dp) |
| goto out; |
| status = check_stateid_generation(stateid, &dp->dl_stateid, |
| flags); |
| if (status) |
| goto out; |
| status = nfs4_check_delegmode(dp, flags); |
| if (status) |
| goto out; |
| renew_client(dp->dl_client); |
| if (filpp) |
| *filpp = find_readable_file(dp->dl_file); |
| BUG_ON(!*filpp); |
| } else { /* open or lock stateid */ |
| stp = find_stateid(stateid, flags); |
| if (!stp) |
| goto out; |
| status = nfserr_bad_stateid; |
| if (nfs4_check_fh(current_fh, stp)) |
| goto out; |
| if (!stp->st_stateowner->so_confirmed) |
| goto out; |
| status = check_stateid_generation(stateid, &stp->st_stateid, |
| flags); |
| if (status) |
| goto out; |
| status = nfs4_check_openmode(stp, flags); |
| if (status) |
| goto out; |
| renew_client(stp->st_stateowner->so_client); |
| if (filpp) { |
| if (flags & RD_STATE) |
| *filpp = find_readable_file(stp->st_file); |
| else |
| *filpp = find_writeable_file(stp->st_file); |
| } |
| } |
| status = nfs_ok; |
| out: |
| return status; |
| } |
| |
| static inline int |
| setlkflg (int type) |
| { |
| return (type == NFS4_READW_LT || type == NFS4_READ_LT) ? |
| RD_STATE : WR_STATE; |
| } |
| |
| /* |
| * Checks for sequence id mutating operations. |
| */ |
| static __be32 |
| nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, |
| stateid_t *stateid, int flags, |
| struct nfs4_stateowner **sopp, |
| struct nfs4_stateid **stpp, struct nfsd4_lock *lock) |
| { |
| struct nfs4_stateid *stp; |
| struct nfs4_stateowner *sop; |
| struct svc_fh *current_fh = &cstate->current_fh; |
| __be32 status; |
| |
| dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__, |
| seqid, STATEID_VAL(stateid)); |
| |
| *stpp = NULL; |
| *sopp = NULL; |
| |
| if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) { |
| dprintk("NFSD: preprocess_seqid_op: magic stateid!\n"); |
| return nfserr_bad_stateid; |
| } |
| |
| if (STALE_STATEID(stateid)) |
| return nfserr_stale_stateid; |
| |
| if (nfsd4_has_session(cstate)) |
| flags |= HAS_SESSION; |
| |
| /* |
| * We return BAD_STATEID if filehandle doesn't match stateid, |
| * the confirmed flag is incorrecly set, or the generation |
| * number is incorrect. |
| */ |
| stp = find_stateid(stateid, flags); |
| if (stp == NULL) { |
| /* |
| * Also, we should make sure this isn't just the result of |
| * a replayed close: |
| */ |
| sop = search_close_lru(stateid->si_stateownerid, flags); |
| /* It's not stale; let's assume it's expired: */ |
| if (sop == NULL) |
| return nfserr_expired; |
| *sopp = sop; |
| goto check_replay; |
| } |
| |
| *stpp = stp; |
| *sopp = sop = stp->st_stateowner; |
| |
| if (lock) { |
| clientid_t *lockclid = &lock->v.new.clientid; |
| struct nfs4_client *clp = sop->so_client; |
| int lkflg = 0; |
| __be32 status; |
| |
| lkflg = setlkflg(lock->lk_type); |
| |
| if (lock->lk_is_new) { |
| if (!sop->so_is_open_owner) |
| return nfserr_bad_stateid; |
| if (!(flags & HAS_SESSION) && |
| !same_clid(&clp->cl_clientid, lockclid)) |
| return nfserr_bad_stateid; |
| /* stp is the open stateid */ |
| status = nfs4_check_openmode(stp, lkflg); |
| if (status) |
| return status; |
| } else { |
| /* stp is the lock stateid */ |
| status = nfs4_check_openmode(stp->st_openstp, lkflg); |
| if (status) |
| return status; |
| } |
| } |
| |
| if (nfs4_check_fh(current_fh, stp)) { |
| dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n"); |
| return nfserr_bad_stateid; |
| } |
| |
| /* |
| * We now validate the seqid and stateid generation numbers. |
| * For the moment, we ignore the possibility of |
| * generation number wraparound. |
| */ |
| if (!(flags & HAS_SESSION) && seqid != sop->so_seqid) |
| goto check_replay; |
| |
| if (sop->so_confirmed && flags & CONFIRM) { |
| dprintk("NFSD: preprocess_seqid_op: expected" |
| " unconfirmed stateowner!\n"); |
| return nfserr_bad_stateid; |
| } |
| if (!sop->so_confirmed && !(flags & CONFIRM)) { |
| dprintk("NFSD: preprocess_seqid_op: stateowner not" |
| " confirmed yet!\n"); |
| return nfserr_bad_stateid; |
| } |
| status = check_stateid_generation(stateid, &stp->st_stateid, flags); |
| if (status) |
| return status; |
| renew_client(sop->so_client); |
| return nfs_ok; |
| |
| check_replay: |
| if (seqid == sop->so_seqid - 1) { |
| dprintk("NFSD: preprocess_seqid_op: retransmission?\n"); |
| /* indicate replay to calling function */ |
| return nfserr_replay_me; |
| } |
| dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n", |
| sop->so_seqid, seqid); |
| *sopp = NULL; |
| return nfserr_bad_seqid; |
| } |
| |
| __be32 |
| nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| struct nfsd4_open_confirm *oc) |
| { |
| __be32 status; |
| struct nfs4_stateowner *sop; |
| struct nfs4_stateid *stp; |
| |
| dprintk("NFSD: nfsd4_open_confirm on file %.*s\n", |
| (int)cstate->current_fh.fh_dentry->d_name.len, |
| cstate->current_fh.fh_dentry->d_name.name); |
| |
| status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0); |
| if (status) |
| return status; |
| |
| nfs4_lock_state(); |
| |
| if ((status = nfs4_preprocess_seqid_op(cstate, |
| oc->oc_seqid, &oc->oc_req_stateid, |
| CONFIRM | OPEN_STATE, |
| &oc->oc_stateowner, &stp, NULL))) |
| goto out; |
| |
| sop = oc->oc_stateowner; |
| sop->so_confirmed = 1; |
| update_stateid(&stp->st_stateid); |
| memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t)); |
| dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n", |
| __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stateid)); |
| |
| nfsd4_create_clid_dir(sop->so_client); |
| out: |
| if (oc->oc_stateowner) { |
| nfs4_get_stateowner(oc->oc_stateowner); |
| cstate->replay_owner = oc->oc_stateowner; |
| } |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| |
| /* |
| * unset all bits in union bitmap (bmap) that |
| * do not exist in share (from successful OPEN_DOWNGRADE) |
| */ |
| static void |
| reset_union_bmap_access(unsigned long access, unsigned long *bmap) |
| { |
| int i; |
| for (i = 1; i < 4; i++) { |
| if ((i & access) != i) |
| __clear_bit(i, bmap); |
| } |
| } |
| |
| static void |
| reset_union_bmap_deny(unsigned long deny, unsigned long *bmap) |
| { |
| int i; |
| for (i = 0; i < 4; i++) { |
| if ((i & deny) != i) |
| __clear_bit(i, bmap); |
| } |
| } |
| |
| __be32 |
| nfsd4_open_downgrade(struct svc_rqst *rqstp, |
| struct nfsd4_compound_state *cstate, |
| struct nfsd4_open_downgrade *od) |
| { |
| __be32 status; |
| struct nfs4_stateid *stp; |
| unsigned int share_access; |
| |
| dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n", |
| (int)cstate->current_fh.fh_dentry->d_name.len, |
| cstate->current_fh.fh_dentry->d_name.name); |
| |
| if (!access_valid(od->od_share_access, cstate->minorversion) |
| || !deny_valid(od->od_share_deny)) |
| return nfserr_inval; |
| |
| nfs4_lock_state(); |
| if ((status = nfs4_preprocess_seqid_op(cstate, |
| od->od_seqid, |
| &od->od_stateid, |
| OPEN_STATE, |
| &od->od_stateowner, &stp, NULL))) |
| goto out; |
| |
| status = nfserr_inval; |
| if (!test_bit(od->od_share_access, &stp->st_access_bmap)) { |
| dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n", |
| stp->st_access_bmap, od->od_share_access); |
| goto out; |
| } |
| if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) { |
| dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n", |
| stp->st_deny_bmap, od->od_share_deny); |
| goto out; |
| } |
| set_access(&share_access, stp->st_access_bmap); |
| nfs4_file_downgrade(stp->st_file, share_access & ~od->od_share_access); |
| |
| reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap); |
| reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap); |
| |
| update_stateid(&stp->st_stateid); |
| memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t)); |
| status = nfs_ok; |
| out: |
| if (od->od_stateowner) { |
| nfs4_get_stateowner(od->od_stateowner); |
| cstate->replay_owner = od->od_stateowner; |
| } |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| /* |
| * nfs4_unlock_state() called after encode |
| */ |
| __be32 |
| nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| struct nfsd4_close *close) |
| { |
| __be32 status; |
| struct nfs4_stateid *stp; |
| |
| dprintk("NFSD: nfsd4_close on file %.*s\n", |
| (int)cstate->current_fh.fh_dentry->d_name.len, |
| cstate->current_fh.fh_dentry->d_name.name); |
| |
| nfs4_lock_state(); |
| /* check close_lru for replay */ |
| if ((status = nfs4_preprocess_seqid_op(cstate, |
| close->cl_seqid, |
| &close->cl_stateid, |
| OPEN_STATE | CLOSE_STATE, |
| &close->cl_stateowner, &stp, NULL))) |
| goto out; |
| status = nfs_ok; |
| update_stateid(&stp->st_stateid); |
| memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t)); |
| |
| /* release_stateid() calls nfsd_close() if needed */ |
| release_open_stateid(stp); |
| |
| /* place unused nfs4_stateowners on so_close_lru list to be |
| * released by the laundromat service after the lease period |
| * to enable us to handle CLOSE replay |
| */ |
| if (list_empty(&close->cl_stateowner->so_stateids)) |
| move_to_close_lru(close->cl_stateowner); |
| out: |
| if (close->cl_stateowner) { |
| nfs4_get_stateowner(close->cl_stateowner); |
| cstate->replay_owner = close->cl_stateowner; |
| } |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| __be32 |
| nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| struct nfsd4_delegreturn *dr) |
| { |
| struct nfs4_delegation *dp; |
| stateid_t *stateid = &dr->dr_stateid; |
| struct inode *inode; |
| __be32 status; |
| int flags = 0; |
| |
| if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) |
| return status; |
| inode = cstate->current_fh.fh_dentry->d_inode; |
| |
| if (nfsd4_has_session(cstate)) |
| flags |= HAS_SESSION; |
| nfs4_lock_state(); |
| status = nfserr_bad_stateid; |
| if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) |
| goto out; |
| status = nfserr_stale_stateid; |
| if (STALE_STATEID(stateid)) |
| goto out; |
| status = nfserr_bad_stateid; |
| if (!is_delegation_stateid(stateid)) |
| goto out; |
| status = nfserr_expired; |
| dp = find_delegation_stateid(inode, stateid); |
| if (!dp) |
| goto out; |
| status = check_stateid_generation(stateid, &dp->dl_stateid, flags); |
| if (status) |
| goto out; |
| renew_client(dp->dl_client); |
| |
| unhash_delegation(dp); |
| out: |
| nfs4_unlock_state(); |
| |
| return status; |
| } |
| |
| |
| /* |
| * Lock owner state (byte-range locks) |
| */ |
| #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start)) |
| #define LOCK_HASH_BITS 8 |
| #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS) |
| #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1) |
| |
| static inline u64 |
| end_offset(u64 start, u64 len) |
| { |
| u64 end; |
| |
| end = start + len; |
| return end >= start ? end: NFS4_MAX_UINT64; |
| } |
| |
| /* last octet in a range */ |
| static inline u64 |
| last_byte_offset(u64 start, u64 len) |
| { |
| u64 end; |
| |
| BUG_ON(!len); |
| end = start + len; |
| return end > start ? end - 1: NFS4_MAX_UINT64; |
| } |
| |
| #define lockownerid_hashval(id) \ |
| ((id) & LOCK_HASH_MASK) |
| |
| static inline unsigned int |
| lock_ownerstr_hashval(struct inode *inode, u32 cl_id, |
| struct xdr_netobj *ownername) |
| { |
| return (file_hashval(inode) + cl_id |
| + opaque_hashval(ownername->data, ownername->len)) |
| & LOCK_HASH_MASK; |
| } |
| |
| static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE]; |
| static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE]; |
| static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE]; |
| |
| static struct nfs4_stateid * |
| find_stateid(stateid_t *stid, int flags) |
| { |
| struct nfs4_stateid *local; |
| u32 st_id = stid->si_stateownerid; |
| u32 f_id = stid->si_fileid; |
| unsigned int hashval; |
| |
| dprintk("NFSD: find_stateid flags 0x%x\n",flags); |
| if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) { |
| hashval = stateid_hashval(st_id, f_id); |
| list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) { |
| if ((local->st_stateid.si_stateownerid == st_id) && |
| (local->st_stateid.si_fileid == f_id)) |
| return local; |
| } |
| } |
| |
| if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) { |
| hashval = stateid_hashval(st_id, f_id); |
| list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) { |
| if ((local->st_stateid.si_stateownerid == st_id) && |
| (local->st_stateid.si_fileid == f_id)) |
| return local; |
| } |
| } |
| return NULL; |
| } |
| |
| static struct nfs4_delegation * |
| find_delegation_stateid(struct inode *ino, stateid_t *stid) |
| { |
| struct nfs4_file *fp; |
| struct nfs4_delegation *dl; |
| |
| dprintk("NFSD: %s: stateid=" STATEID_FMT "\n", __func__, |
| STATEID_VAL(stid)); |
| |
| fp = find_file(ino); |
| if (!fp) |
| return NULL; |
| dl = find_delegation_file(fp, stid); |
| put_nfs4_file(fp); |
| return dl; |
| } |
| |
| /* |
| * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that |
| * we can't properly handle lock requests that go beyond the (2^63 - 1)-th |
| * byte, because of sign extension problems. Since NFSv4 calls for 64-bit |
| * locking, this prevents us from being completely protocol-compliant. The |
| * real solution to this problem is to start using unsigned file offsets in |
| * the VFS, but this is a very deep change! |
| */ |
| static inline void |
| nfs4_transform_lock_offset(struct file_lock *lock) |
| { |
| if (lock->fl_start < 0) |
| lock->fl_start = OFFSET_MAX; |
| if (lock->fl_end < 0) |
| lock->fl_end = OFFSET_MAX; |
| } |
| |
| /* Hack!: For now, we're defining this just so we can use a pointer to it |
| * as a unique cookie to identify our (NFSv4's) posix locks. */ |
| static const struct lock_manager_operations nfsd_posix_mng_ops = { |
| }; |
| |
| static inline void |
| nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny) |
| { |
| struct nfs4_stateowner *sop; |
| |
| if (fl->fl_lmops == &nfsd_posix_mng_ops) { |
| sop = (struct nfs4_stateowner *) fl->fl_owner; |
| kref_get(&sop->so_ref); |
| deny->ld_sop = sop; |
| deny->ld_clientid = sop->so_client->cl_clientid; |
| } else { |
| deny->ld_sop = NULL; |
| deny->ld_clientid.cl_boot = 0; |
| deny->ld_clientid.cl_id = 0; |
| } |
| deny->ld_start = fl->fl_start; |
| deny->ld_length = NFS4_MAX_UINT64; |
| if (fl->fl_end != NFS4_MAX_UINT64) |
| deny->ld_length = fl->fl_end - fl->fl_start + 1; |
| deny->ld_type = NFS4_READ_LT; |
| if (fl->fl_type != F_RDLCK) |
| deny->ld_type = NFS4_WRITE_LT; |
| } |
| |
| static struct nfs4_stateowner * |
| find_lockstateowner_str(struct inode *inode, clientid_t *clid, |
| struct xdr_netobj *owner) |
| { |
| unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner); |
| struct nfs4_stateowner *op; |
| |
| list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) { |
| if (same_owner_str(op, owner, clid)) |
| return op; |
| } |
| return NULL; |
| } |
| |
| /* |
| * Alloc a lock owner structure. |
| * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has |
| * occured. |
| * |
| * strhashval = lock_ownerstr_hashval |
| */ |
| |
| static struct nfs4_stateowner * |
| alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) { |
| struct nfs4_stateowner *sop; |
| struct nfs4_replay *rp; |
| unsigned int idhashval; |
| |
| if (!(sop = alloc_stateowner(&lock->lk_new_owner))) |
| return NULL; |
| idhashval = lockownerid_hashval(current_ownerid); |
| INIT_LIST_HEAD(&sop->so_idhash); |
| INIT_LIST_HEAD(&sop->so_strhash); |
| INIT_LIST_HEAD(&sop->so_perclient); |
| INIT_LIST_HEAD(&sop->so_stateids); |
| INIT_LIST_HEAD(&sop->so_perstateid); |
| INIT_LIST_HEAD(&sop->so_close_lru); /* not used */ |
| sop->so_time = 0; |
| list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]); |
| list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]); |
| list_add(&sop->so_perstateid, &open_stp->st_lockowners); |
| sop->so_is_open_owner = 0; |
| sop->so_id = current_ownerid++; |
| sop->so_client = clp; |
| /* It is the openowner seqid that will be incremented in encode in the |
| * case of new lockowners; so increment the lock seqid manually: */ |
| sop->so_seqid = lock->lk_new_lock_seqid + 1; |
| sop->so_confirmed = 1; |
| rp = &sop->so_replay; |
| rp->rp_status = nfserr_serverfault; |
| rp->rp_buflen = 0; |
| rp->rp_buf = rp->rp_ibuf; |
| return sop; |
| } |
| |
| static struct nfs4_stateid * |
| alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp) |
| { |
| struct nfs4_stateid *stp; |
| unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id); |
| |
| stp = nfs4_alloc_stateid(); |
| if (stp == NULL) |
| goto out; |
| INIT_LIST_HEAD(&stp->st_hash); |
| INIT_LIST_HEAD(&stp->st_perfile); |
| INIT_LIST_HEAD(&stp->st_perstateowner); |
| INIT_LIST_HEAD(&stp->st_lockowners); /* not used */ |
| list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]); |
| list_add(&stp->st_perfile, &fp->fi_stateids); |
| list_add(&stp->st_perstateowner, &sop->so_stateids); |
| stp->st_stateowner = sop; |
| get_nfs4_file(fp); |
| stp->st_file = fp; |
| stp->st_stateid.si_boot = 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_deny_bmap = open_stp->st_deny_bmap; |
| stp->st_openstp = open_stp; |
| |
| out: |
| return stp; |
| } |
| |
| static int |
| check_lock_length(u64 offset, u64 length) |
| { |
| return ((length == 0) || ((length != NFS4_MAX_UINT64) && |
| LOFF_OVERFLOW(offset, length))); |
| } |
| |
| /* |
| * LOCK operation |
| */ |
| __be32 |
| nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| struct nfsd4_lock *lock) |
| { |
| struct nfs4_stateowner *open_sop = NULL; |
| struct nfs4_stateowner *lock_sop = NULL; |
| struct nfs4_stateid *lock_stp; |
| struct nfs4_file *fp; |
| struct file *filp = NULL; |
| struct file_lock file_lock; |
| struct file_lock conflock; |
| __be32 status = 0; |
| unsigned int strhashval; |
| unsigned int cmd; |
| int err; |
| |
| dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n", |
| (long long) lock->lk_offset, |
| (long long) lock->lk_length); |
| |
| if (check_lock_length(lock->lk_offset, lock->lk_length)) |
| return nfserr_inval; |
| |
| if ((status = fh_verify(rqstp, &cstate->current_fh, |
| S_IFREG, NFSD_MAY_LOCK))) { |
| dprintk("NFSD: nfsd4_lock: permission denied!\n"); |
| return status; |
| } |
| |
| nfs4_lock_state(); |
| |
| if (lock->lk_is_new) { |
| /* |
| * Client indicates that this is a new lockowner. |
| * Use open owner and open stateid to create lock owner and |
| * lock stateid. |
| */ |
| struct nfs4_stateid *open_stp = NULL; |
| |
| status = nfserr_stale_clientid; |
| if (!nfsd4_has_session(cstate) && |
| STALE_CLIENTID(&lock->lk_new_clientid)) |
| goto out; |
| |
| /* validate and update open stateid and open seqid */ |
| status = nfs4_preprocess_seqid_op(cstate, |
| lock->lk_new_open_seqid, |
| &lock->lk_new_open_stateid, |
| OPEN_STATE, |
| &lock->lk_replay_owner, &open_stp, |
| lock); |
| if (status) |
| goto out; |
| open_sop = lock->lk_replay_owner; |
| /* create lockowner and lock stateid */ |
| fp = open_stp->st_file; |
| strhashval = lock_ownerstr_hashval(fp->fi_inode, |
| open_sop->so_client->cl_clientid.cl_id, |
| &lock->v.new.owner); |
| /* XXX: Do we need to check for duplicate stateowners on |
| * the same file, or should they just be allowed (and |
| * create new stateids)? */ |
| status = nfserr_resource; |
| lock_sop = alloc_init_lock_stateowner(strhashval, |
| open_sop->so_client, open_stp, lock); |
| if (lock_sop == NULL) |
| goto out; |
| lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp); |
| if (lock_stp == NULL) |
| goto out; |
| } else { |
| /* lock (lock owner + lock stateid) already exists */ |
| status = nfs4_preprocess_seqid_op(cstate, |
| lock->lk_old_lock_seqid, |
| &lock->lk_old_lock_stateid, |
| LOCK_STATE, |
| &lock->lk_replay_owner, &lock_stp, lock); |
| if (status) |
| goto out; |
| lock_sop = lock->lk_replay_owner; |
| fp = lock_stp->st_file; |
| } |
| /* lock->lk_replay_owner and lock_stp have been created or found */ |
| |
| status = nfserr_grace; |
| if (locks_in_grace() && !lock->lk_reclaim) |
| goto out; |
| status = nfserr_no_grace; |
| if (!locks_in_grace() && lock->lk_reclaim) |
| goto out; |
| |
| locks_init_lock(&file_lock); |
| switch (lock->lk_type) { |
| case NFS4_READ_LT: |
| case NFS4_READW_LT: |
| if (find_readable_file(lock_stp->st_file)) { |
| nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_READ); |
| filp = find_readable_file(lock_stp->st_file); |
| } |
| file_lock.fl_type = F_RDLCK; |
| cmd = F_SETLK; |
| break; |
| case NFS4_WRITE_LT: |
| case NFS4_WRITEW_LT: |
| if (find_writeable_file(lock_stp->st_file)) { |
| nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_WRITE); |
| filp = find_writeable_file(lock_stp->st_file); |
| } |
| file_lock.fl_type = F_WRLCK; |
| cmd = F_SETLK; |
| break; |
| default: |
| status = nfserr_inval; |
| goto out; |
| } |
| if (!filp) { |
| status = nfserr_openmode; |
| goto out; |
| } |
| file_lock.fl_owner = (fl_owner_t)lock_sop; |
| file_lock.fl_pid = current->tgid; |
| file_lock.fl_file = filp; |
| file_lock.fl_flags = FL_POSIX; |
| file_lock.fl_lmops = &nfsd_posix_mng_ops; |
| |
| file_lock.fl_start = lock->lk_offset; |
| file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length); |
| nfs4_transform_lock_offset(&file_lock); |
| |
| /* |
| * Try to lock the file in the VFS. |
| * Note: locks.c uses the BKL to protect the inode's lock list. |
| */ |
| |
| err = vfs_lock_file(filp, cmd, &file_lock, &conflock); |
| switch (-err) { |
| case 0: /* success! */ |
| update_stateid(&lock_stp->st_stateid); |
| memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid, |
| sizeof(stateid_t)); |
| status = 0; |
| break; |
| case (EAGAIN): /* conflock holds conflicting lock */ |
| status = nfserr_denied; |
| dprintk("NFSD: nfsd4_lock: conflicting lock found!\n"); |
| nfs4_set_lock_denied(&conflock, &lock->lk_denied); |
| break; |
| case (EDEADLK): |
| status = nfserr_deadlock; |
| break; |
| default: |
| dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err); |
| status = nfserr_resource; |
| break; |
| } |
| out: |
| if (status && lock->lk_is_new && lock_sop) |
| release_lockowner(lock_sop); |
| if (lock->lk_replay_owner) { |
| nfs4_get_stateowner(lock->lk_replay_owner); |
| cstate->replay_owner = lock->lk_replay_owner; |
| } |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| /* |
| * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN, |
| * so we do a temporary open here just to get an open file to pass to |
| * vfs_test_lock. (Arguably perhaps test_lock should be done with an |
| * inode operation.) |
| */ |
| static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock) |
| { |
| struct file *file; |
| int err; |
| |
| err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); |
| if (err) |
| return err; |
| err = vfs_test_lock(file, lock); |
| nfsd_close(file); |
| return err; |
| } |
| |
| /* |
| * LOCKT operation |
| */ |
| __be32 |
| nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| struct nfsd4_lockt *lockt) |
| { |
| struct inode *inode; |
| struct file_lock file_lock; |
| int error; |
| __be32 status; |
| |
| if (locks_in_grace()) |
| return nfserr_grace; |
| |
| if (check_lock_length(lockt->lt_offset, lockt->lt_length)) |
| return nfserr_inval; |
| |
| lockt->lt_stateowner = NULL; |
| nfs4_lock_state(); |
| |
| status = nfserr_stale_clientid; |
| if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid)) |
| goto out; |
| |
| if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) { |
| dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n"); |
| if (status == nfserr_symlink) |
| status = nfserr_inval; |
| goto out; |
| } |
| |
| inode = cstate->current_fh.fh_dentry->d_inode; |
| locks_init_lock(&file_lock); |
| switch (lockt->lt_type) { |
| case NFS4_READ_LT: |
| case NFS4_READW_LT: |
| file_lock.fl_type = F_RDLCK; |
| break; |
| case NFS4_WRITE_LT: |
| case NFS4_WRITEW_LT: |
| file_lock.fl_type = F_WRLCK; |
| break; |
| default: |
| dprintk("NFSD: nfs4_lockt: bad lock type!\n"); |
| status = nfserr_inval; |
| goto out; |
| } |
| |
| lockt->lt_stateowner = find_lockstateowner_str(inode, |
| &lockt->lt_clientid, &lockt->lt_owner); |
| if (lockt->lt_stateowner) |
| file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner; |
| file_lock.fl_pid = current->tgid; |
| file_lock.fl_flags = FL_POSIX; |
| |
| file_lock.fl_start = lockt->lt_offset; |
| file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length); |
| |
| nfs4_transform_lock_offset(&file_lock); |
| |
| status = nfs_ok; |
| error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock); |
| if (error) { |
| status = nfserrno(error); |
| goto out; |
| } |
| if (file_lock.fl_type != F_UNLCK) { |
| status = nfserr_denied; |
| nfs4_set_lock_denied(&file_lock, &lockt->lt_denied); |
| } |
| out: |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| __be32 |
| nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, |
| struct nfsd4_locku *locku) |
| { |
| struct nfs4_stateid *stp; |
| struct file *filp = NULL; |
| struct file_lock file_lock; |
| __be32 status; |
| int err; |
| |
| dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n", |
| (long long) locku->lu_offset, |
| (long long) locku->lu_length); |
| |
| if (check_lock_length(locku->lu_offset, locku->lu_length)) |
| return nfserr_inval; |
| |
| nfs4_lock_state(); |
| |
| if ((status = nfs4_preprocess_seqid_op(cstate, |
| locku->lu_seqid, |
| &locku->lu_stateid, |
| LOCK_STATE, |
| &locku->lu_stateowner, &stp, NULL))) |
| goto out; |
| |
| filp = find_any_file(stp->st_file); |
| if (!filp) { |
| status = nfserr_lock_range; |
| goto out; |
| } |
| BUG_ON(!filp); |
| locks_init_lock(&file_lock); |
| file_lock.fl_type = F_UNLCK; |
| file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner; |
| file_lock.fl_pid = current->tgid; |
| file_lock.fl_file = filp; |
| file_lock.fl_flags = FL_POSIX; |
| file_lock.fl_lmops = &nfsd_posix_mng_ops; |
| file_lock.fl_start = locku->lu_offset; |
| |
| file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length); |
| nfs4_transform_lock_offset(&file_lock); |
| |
| /* |
| * Try to unlock the file in the VFS. |
| */ |
| err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL); |
| if (err) { |
| dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n"); |
| goto out_nfserr; |
| } |
| /* |
| * OK, unlock succeeded; the only thing left to do is update the stateid. |
| */ |
| update_stateid(&stp->st_stateid); |
| memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t)); |
| |
| out: |
| if (locku->lu_stateowner) { |
| nfs4_get_stateowner(locku->lu_stateowner); |
| cstate->replay_owner = locku->lu_stateowner; |
| } |
| nfs4_unlock_state(); |
| return status; |
| |
| out_nfserr: |
| status = nfserrno(err); |
| goto out; |
| } |
| |
| /* |
| * returns |
| * 1: locks held by lockowner |
| * 0: no locks held by lockowner |
| */ |
| static int |
| check_for_locks(struct nfs4_file *filp, struct nfs4_stateowner *lowner) |
| { |
| struct file_lock **flpp; |
| struct inode *inode = filp->fi_inode; |
| int status = 0; |
| |
| lock_flocks(); |
| 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_flocks(); |
| return status; |
| } |
| |
| __be32 |
| nfsd4_release_lockowner(struct svc_rqst *rqstp, |
| struct nfsd4_compound_state *cstate, |
| struct nfsd4_release_lockowner *rlockowner) |
| { |
| clientid_t *clid = &rlockowner->rl_clientid; |
| struct nfs4_stateowner *sop; |
| struct nfs4_stateid *stp; |
| struct xdr_netobj *owner = &rlockowner->rl_owner; |
| struct list_head matches; |
| int i; |
| __be32 status; |
| |
| dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n", |
| clid->cl_boot, clid->cl_id); |
| |
| /* XXX check for lease expiration */ |
| |
| status = nfserr_stale_clientid; |
| if (STALE_CLIENTID(clid)) |
| return status; |
| |
| nfs4_lock_state(); |
| |
| status = nfserr_locks_held; |
| /* XXX: we're doing a linear search through all the lockowners. |
| * Yipes! For now we'll just hope clients aren't really using |
| * release_lockowner much, but eventually we have to fix these |
| * data structures. */ |
| INIT_LIST_HEAD(&matches); |
| for (i = 0; i < LOCK_HASH_SIZE; i++) { |
| list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) { |
| if (!same_owner_str(sop, owner, clid)) |
| continue; |
| list_for_each_entry(stp, &sop->so_stateids, |
| st_perstateowner) { |
| if (check_for_locks(stp->st_file, sop)) |
| goto out; |
| /* Note: so_perclient unused for lockowners, |
| * so it's OK to fool with here. */ |
| list_add(&sop->so_perclient, &matches); |
| } |
| } |
| } |
| /* Clients probably won't expect us to return with some (but not all) |
| * of the lockowner state released; so don't release any until all |
| * have been checked. */ |
| status = nfs_ok; |
| while (!list_empty(&matches)) { |
| sop = list_entry(matches.next, struct nfs4_stateowner, |
| so_perclient); |
| /* unhash_stateowner deletes so_perclient only |
| * for openowners. */ |
| list_del(&sop->so_perclient); |
| release_lockowner(sop); |
| } |
| out: |
| nfs4_unlock_state(); |
| return status; |
| } |
| |
| static inline struct nfs4_client_reclaim * |
| alloc_reclaim(void) |
| { |
| return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL); |
| } |
| |
| int |
| nfs4_has_reclaimed_state(const char *name, bool use_exchange_id) |
| { |
| unsigned int strhashval = clientstr_hashval(name); |
| struct nfs4_client *clp; |
| |
| clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id); |
| return clp ? 1 : 0; |
| } |
| |
| /* |
| * failure => all reset bets are off, nfserr_no_grace... |
| */ |
| int |
| nfs4_client_to_reclaim(const char *name) |
| { |
| unsigned int strhashval; |
| struct nfs4_client_reclaim *crp = NULL; |
| |
| dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name); |
| crp = alloc_reclaim(); |
| if (!crp) |
| return 0; |
| strhashval = clientstr_hashval(name); |
| INIT_LIST_HEAD(&crp->cr_strhash); |
| list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]); |
| memcpy(crp->cr_recdir, name, HEXDIR_LEN); |
| reclaim_str_hashtbl_size++; |
| return 1; |
| } |
| |
| static void |
| nfs4_release_reclaim(void) |
| { |
| struct nfs4_client_reclaim *crp = NULL; |
| int i; |
| |
| for (i = 0; i < CLIENT_HASH_SIZE; i++) { |
| while (!list_empty(&reclaim_str_hashtbl[i])) { |
| crp = list_entry(reclaim_str_hashtbl[i].next, |
| struct nfs4_client_reclaim, cr_strhash); |
| list_del(&crp->cr_strhash); |
| kfree(crp); |
| reclaim_str_hashtbl_size--; |
| } |
| } |
| BUG_ON(reclaim_str_hashtbl_size); |
| } |
| |
| /* |
| * called from OPEN, CLAIM_PREVIOUS with a new clientid. */ |
| static struct nfs4_client_reclaim * |
| nfs4_find_reclaim_client(clientid_t *clid) |
| { |
| unsigned int strhashval; |
| struct nfs4_client *clp; |
| struct nfs4_client_reclaim *crp = NULL; |
| |
| |
| /* find clientid in conf_id_hashtbl */ |
| clp = find_confirmed_client(clid); |
| if (clp == NULL) |
| return NULL; |
| |
| dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n", |
| clp->cl_name.len, clp->cl_name.data, |
| clp->cl_recdir); |
| |
| /* find clp->cl_name in reclaim_str_hashtbl */ |
| strhashval = clientstr_hashval(clp->cl_recdir); |
| list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) { |
| if (same_name(crp->cr_recdir, clp->cl_recdir)) { |
| return crp; |
| } |
| } |
| return NULL; |
| } |
| |
| /* |
| * Called from OPEN. Look for clientid in reclaim list. |
| */ |
| __be32 |
| nfs4_check_open_reclaim(clientid_t *clid) |
| { |
| return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad; |
| } |
| |
| /* initialization to perform at module load time: */ |
| |
| int |
| nfs4_state_init(void) |
| { |
| int i, status; |
| |
| status = nfsd4_init_slabs(); |
| if (status) |
| return status; |
| for (i = 0; i < CLIENT_HASH_SIZE; i++) { |
| INIT_LIST_HEAD(&conf_id_hashtbl[i]); |
| INIT_LIST_HEAD(&conf_str_hashtbl[i]); |
| INIT_LIST_HEAD(&unconf_str_hashtbl[i]); |
| INIT_LIST_HEAD(&unconf_id_hashtbl[i]); |
| INIT_LIST_HEAD(&reclaim_str_hashtbl[i]); |
| } |
| for (i = 0; i < SESSION_HASH_SIZE; i++) |
| INIT_LIST_HEAD(&sessionid_hashtbl[i]); |
| for (i = 0; i < FILE_HASH_SIZE; i++) { |
| INIT_LIST_HEAD(&file_hashtbl[i]); |
| } |
| for (i = 0; i < OWNER_HASH_SIZE; i++) { |
| INIT_LIST_HEAD(&ownerstr_hashtbl[i]); |
| INIT_LIST_HEAD(&ownerid_hashtbl[i]); |
| } |
| for (i = 0; i < STATEID_HASH_SIZE; i++) { |
| INIT_LIST_HEAD(&stateid_hashtbl[i]); |
| INIT_LIST_HEAD(&lockstateid_hashtbl[i]); |
| } |
| for (i = 0; i < LOCK_HASH_SIZE; i++) { |
| INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]); |
| INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]); |
| } |
| memset(&onestateid, ~0, sizeof(stateid_t)); |
| INIT_LIST_HEAD(&close_lru); |
| INIT_LIST_HEAD(&client_lru); |
| INIT_LIST_HEAD(&del_recall_lru); |
| reclaim_str_hashtbl_size = 0; |
| return 0; |
| } |
| |
| static void |
| nfsd4_load_reboot_recovery_data(void) |
| { |
| int status; |
| |
| nfs4_lock_state(); |
| nfsd4_init_recdir(user_recovery_dirname); |
| status = nfsd4_recdir_load(); |
| nfs4_unlock_state(); |
| if (status) |
| printk("NFSD: Failure reading reboot recovery data\n"); |
| } |
| |
| /* |
| * Since the lifetime of a delegation isn't limited to that of an open, a |
| * client may quite reasonably hang on to a delegation as long as it has |
| * the inode cached. This becomes an obvious problem the first time a |
| * client's inode cache approaches the size of the server's total memory. |
| * |
| * For now we avoid this problem by imposing a hard limit on the number |
| * of delegations, which varies according to the server's memory size. |
| */ |
| static void |
| set_max_delegations(void) |
| { |
| /* |
| * Allow at most 4 delegations per megabyte of RAM. Quick |
| * estimates suggest that in the worst case (where every delegation |
| * is for a different inode), a delegation could take about 1.5K, |
| * giving a worst case usage of about 6% of memory. |
| */ |
| max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT); |
| } |
| |
| /* initialization to perform when the nfsd service is started: */ |
| |
| static int |
| __nfs4_state_start(void) |
| { |
| int ret; |
| |
| boot_time = get_seconds(); |
| locks_start_grace(&nfsd4_manager); |
| printk(KERN_INFO "NFSD: starting %ld-second grace period\n", |
| nfsd4_grace); |
| ret = set_callback_cred(); |
| if (ret) |
| return -ENOMEM; |
| laundry_wq = create_singlethread_workqueue("nfsd4"); |
| if (laundry_wq == NULL) |
| return -ENOMEM; |
| ret = nfsd4_create_callback_queue(); |
| if (ret) |
| goto out_free_laundry; |
| queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ); |
| set_max_delegations(); |
| return 0; |
| out_free_laundry: |
| destroy_workqueue(laundry_wq); |
| return ret; |
| } |
| |
| int |
| nfs4_state_start(void) |
| { |
| nfsd4_load_reboot_recovery_data(); |
| return __nfs4_state_start(); |
| } |
| |
| static void |
| __nfs4_state_shutdown(void) |
| { |
| int i; |
| struct nfs4_client *clp = NULL; |
| struct nfs4_delegation *dp = NULL; |
| struct list_head *pos, *next, reaplist; |
| |
| for (i = 0; i < CLIENT_HASH_SIZE; i++) { |
| while (!list_empty(&conf_id_hashtbl[i])) { |
| clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash); |
| expire_client(clp); |
| } |
| while (!list_empty(&unconf_str_hashtbl[i])) { |
| clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash); |
| expire_client(clp); |
| } |
| } |
| INIT_LIST_HEAD(&reaplist); |
| spin_lock(&recall_lock); |
| list_for_each_safe(pos, next, &del_recall_lru) { |
| dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); |
| list_move(&dp->dl_recall_lru, &reaplist); |
| } |
| spin_unlock(&recall_lock); |
| list_for_each_safe(pos, next, &reaplist) { |
| dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru); |
| list_del_init(&dp->dl_recall_lru); |
| unhash_delegation(dp); |
| } |
| |
| nfsd4_shutdown_recdir(); |
| } |
| |
| void |
| nfs4_state_shutdown(void) |
| { |
| cancel_delayed_work_sync(&laundromat_work); |
| destroy_workqueue(laundry_wq); |
| locks_end_grace(&nfsd4_manager); |
| nfs4_lock_state(); |
| nfs4_release_reclaim(); |
| __nfs4_state_shutdown(); |
| nfs4_unlock_state(); |
| nfsd4_destroy_callback_queue(); |
| } |
| |
| /* |
| * user_recovery_dirname is protected by the nfsd_mutex since it's only |
| * accessed when nfsd is starting. |
| */ |
| static void |
| nfs4_set_recdir(char *recdir) |
| { |
| strcpy(user_recovery_dirname, recdir); |
| } |
| |
| /* |
| * Change the NFSv4 recovery directory to recdir. |
| */ |
| int |
| nfs4_reset_recoverydir(char *recdir) |
| { |
| int status; |
| struct path path; |
| |
| status = kern_path(recdir, LOOKUP_FOLLOW, &path); |
| if (status) |
| return status; |
| status = -ENOTDIR; |
| if (S_ISDIR(path.dentry->d_inode->i_mode)) { |
| nfs4_set_recdir(recdir); |
| status = 0; |
| } |
| path_put(&path); |
| return status; |
| } |
| |
| char * |
| nfs4_recoverydir(void) |
| { |
| return user_recovery_dirname; |
| } |