Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/lockd/clntproc.c |
| 3 | * |
| 4 | * RPC procedures for the client side NLM implementation |
| 5 | * |
| 6 | * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/module.h> |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/errno.h> |
| 12 | #include <linux/fs.h> |
| 13 | #include <linux/nfs_fs.h> |
| 14 | #include <linux/utsname.h> |
| 15 | #include <linux/smp_lock.h> |
| 16 | #include <linux/sunrpc/clnt.h> |
| 17 | #include <linux/sunrpc/svc.h> |
| 18 | #include <linux/lockd/lockd.h> |
| 19 | #include <linux/lockd/sm_inter.h> |
| 20 | |
| 21 | #define NLMDBG_FACILITY NLMDBG_CLIENT |
| 22 | #define NLMCLNT_GRACE_WAIT (5*HZ) |
Trond Myklebust | ecdbf76 | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 23 | #define NLMCLNT_POLL_TIMEOUT (30*HZ) |
Trond Myklebust | aaaa994 | 2006-02-01 12:18:25 -0500 | [diff] [blame] | 24 | #define NLMCLNT_MAX_RETRIES 3 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | static int nlmclnt_test(struct nlm_rqst *, struct file_lock *); |
| 27 | static int nlmclnt_lock(struct nlm_rqst *, struct file_lock *); |
| 28 | static int nlmclnt_unlock(struct nlm_rqst *, struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | static int nlm_stat_to_errno(u32 stat); |
| 30 | static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host); |
Trond Myklebust | 16fb242 | 2006-02-01 12:18:22 -0500 | [diff] [blame] | 31 | static int nlmclnt_cancel(struct nlm_host *, int , struct file_lock *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 33 | static const struct rpc_call_ops nlmclnt_unlock_ops; |
| 34 | static const struct rpc_call_ops nlmclnt_cancel_ops; |
| 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | /* |
| 37 | * Cookie counter for NLM requests |
| 38 | */ |
| 39 | static u32 nlm_cookie = 0x1234; |
| 40 | |
| 41 | static inline void nlmclnt_next_cookie(struct nlm_cookie *c) |
| 42 | { |
| 43 | memcpy(c->data, &nlm_cookie, 4); |
| 44 | memset(c->data+4, 0, 4); |
| 45 | c->len=4; |
| 46 | nlm_cookie++; |
| 47 | } |
| 48 | |
| 49 | static struct nlm_lockowner *nlm_get_lockowner(struct nlm_lockowner *lockowner) |
| 50 | { |
| 51 | atomic_inc(&lockowner->count); |
| 52 | return lockowner; |
| 53 | } |
| 54 | |
| 55 | static void nlm_put_lockowner(struct nlm_lockowner *lockowner) |
| 56 | { |
| 57 | if (!atomic_dec_and_lock(&lockowner->count, &lockowner->host->h_lock)) |
| 58 | return; |
| 59 | list_del(&lockowner->list); |
| 60 | spin_unlock(&lockowner->host->h_lock); |
| 61 | nlm_release_host(lockowner->host); |
| 62 | kfree(lockowner); |
| 63 | } |
| 64 | |
| 65 | static inline int nlm_pidbusy(struct nlm_host *host, uint32_t pid) |
| 66 | { |
| 67 | struct nlm_lockowner *lockowner; |
| 68 | list_for_each_entry(lockowner, &host->h_lockowners, list) { |
| 69 | if (lockowner->pid == pid) |
| 70 | return -EBUSY; |
| 71 | } |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static inline uint32_t __nlm_alloc_pid(struct nlm_host *host) |
| 76 | { |
| 77 | uint32_t res; |
| 78 | do { |
| 79 | res = host->h_pidcount++; |
| 80 | } while (nlm_pidbusy(host, res) < 0); |
| 81 | return res; |
| 82 | } |
| 83 | |
| 84 | static struct nlm_lockowner *__nlm_find_lockowner(struct nlm_host *host, fl_owner_t owner) |
| 85 | { |
| 86 | struct nlm_lockowner *lockowner; |
| 87 | list_for_each_entry(lockowner, &host->h_lockowners, list) { |
| 88 | if (lockowner->owner != owner) |
| 89 | continue; |
| 90 | return nlm_get_lockowner(lockowner); |
| 91 | } |
| 92 | return NULL; |
| 93 | } |
| 94 | |
| 95 | static struct nlm_lockowner *nlm_find_lockowner(struct nlm_host *host, fl_owner_t owner) |
| 96 | { |
| 97 | struct nlm_lockowner *res, *new = NULL; |
| 98 | |
| 99 | spin_lock(&host->h_lock); |
| 100 | res = __nlm_find_lockowner(host, owner); |
| 101 | if (res == NULL) { |
| 102 | spin_unlock(&host->h_lock); |
Panagiotis Issaris | f52720c | 2006-09-27 01:49:39 -0700 | [diff] [blame] | 103 | new = kmalloc(sizeof(*new), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | spin_lock(&host->h_lock); |
| 105 | res = __nlm_find_lockowner(host, owner); |
| 106 | if (res == NULL && new != NULL) { |
| 107 | res = new; |
| 108 | atomic_set(&new->count, 1); |
| 109 | new->owner = owner; |
| 110 | new->pid = __nlm_alloc_pid(host); |
| 111 | new->host = nlm_get_host(host); |
| 112 | list_add(&new->list, &host->h_lockowners); |
| 113 | new = NULL; |
| 114 | } |
| 115 | } |
| 116 | spin_unlock(&host->h_lock); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 117 | kfree(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | return res; |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Initialize arguments for TEST/LOCK/UNLOCK/CANCEL calls |
| 123 | */ |
| 124 | static void nlmclnt_setlockargs(struct nlm_rqst *req, struct file_lock *fl) |
| 125 | { |
| 126 | struct nlm_args *argp = &req->a_args; |
| 127 | struct nlm_lock *lock = &argp->lock; |
| 128 | |
| 129 | nlmclnt_next_cookie(&argp->cookie); |
| 130 | argp->state = nsm_local_state; |
| 131 | memcpy(&lock->fh, NFS_FH(fl->fl_file->f_dentry->d_inode), sizeof(struct nfs_fh)); |
| 132 | lock->caller = system_utsname.nodename; |
| 133 | lock->oh.data = req->a_owner; |
Trond Myklebust | 7bab377 | 2006-03-20 13:44:06 -0500 | [diff] [blame] | 134 | lock->oh.len = snprintf(req->a_owner, sizeof(req->a_owner), "%u@%s", |
| 135 | (unsigned int)fl->fl_u.nfs_fl.owner->pid, |
| 136 | system_utsname.nodename); |
| 137 | lock->svid = fl->fl_u.nfs_fl.owner->pid; |
Trond Myklebust | 3a649b8 | 2006-03-20 13:44:44 -0500 | [diff] [blame] | 138 | lock->fl.fl_start = fl->fl_start; |
| 139 | lock->fl.fl_end = fl->fl_end; |
| 140 | lock->fl.fl_type = fl->fl_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | static void nlmclnt_release_lockargs(struct nlm_rqst *req) |
| 144 | { |
Trond Myklebust | 3a649b8 | 2006-03-20 13:44:44 -0500 | [diff] [blame] | 145 | BUG_ON(req->a_args.lock.fl.fl_ops != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } |
| 147 | |
| 148 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | * This is the main entry point for the NLM client. |
| 150 | */ |
| 151 | int |
| 152 | nlmclnt_proc(struct inode *inode, int cmd, struct file_lock *fl) |
| 153 | { |
Chuck Lever | 44c31be | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 154 | struct rpc_clnt *client = NFS_CLIENT(inode); |
| 155 | struct sockaddr_in addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | struct nlm_host *host; |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 157 | struct nlm_rqst *call; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | sigset_t oldset; |
| 159 | unsigned long flags; |
Chuck Lever | 44c31be | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 160 | int status, vers; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
| 162 | vers = (NFS_PROTO(inode)->version == 3) ? 4 : 1; |
| 163 | if (NFS_PROTO(inode)->version > 3) { |
| 164 | printk(KERN_NOTICE "NFSv4 file locking not implemented!\n"); |
| 165 | return -ENOLCK; |
| 166 | } |
| 167 | |
Chuck Lever | 44c31be | 2006-08-22 20:06:17 -0400 | [diff] [blame] | 168 | rpc_peeraddr(client, (struct sockaddr *) &addr, sizeof(addr)); |
| 169 | host = nlmclnt_lookup_host(&addr, client->cl_xprt->prot, vers); |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 170 | if (host == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | return -ENOLCK; |
| 172 | |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 173 | call = nlm_alloc_call(host); |
| 174 | if (call == NULL) |
| 175 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 177 | nlmclnt_locks_init_private(fl, host); |
| 178 | /* Set up the argument struct */ |
| 179 | nlmclnt_setlockargs(call, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
| 181 | /* Keep the old signal mask */ |
| 182 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 183 | oldset = current->blocked; |
| 184 | |
| 185 | /* If we're cleaning up locks because the process is exiting, |
| 186 | * perform the RPC call asynchronously. */ |
| 187 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) |
| 188 | && fl->fl_type == F_UNLCK |
| 189 | && (current->flags & PF_EXITING)) { |
| 190 | sigfillset(¤t->blocked); /* Mask all signals */ |
| 191 | recalc_sigpending(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | call->a_flags = RPC_TASK_ASYNC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 195 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | if (IS_SETLK(cmd) || IS_SETLKW(cmd)) { |
| 198 | if (fl->fl_type != F_UNLCK) { |
| 199 | call->a_args.block = IS_SETLKW(cmd) ? 1 : 0; |
| 200 | status = nlmclnt_lock(call, fl); |
| 201 | } else |
| 202 | status = nlmclnt_unlock(call, fl); |
| 203 | } else if (IS_GETLK(cmd)) |
| 204 | status = nlmclnt_test(call, fl); |
| 205 | else |
| 206 | status = -EINVAL; |
| 207 | |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 208 | fl->fl_ops->fl_release_private(fl); |
| 209 | fl->fl_ops = NULL; |
| 210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 212 | current->blocked = oldset; |
| 213 | recalc_sigpending(); |
| 214 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
| 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | dprintk("lockd: clnt proc returns %d\n", status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | return status; |
| 218 | } |
| 219 | EXPORT_SYMBOL(nlmclnt_proc); |
| 220 | |
| 221 | /* |
| 222 | * Allocate an NLM RPC call struct |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 223 | * |
| 224 | * Note: the caller must hold a reference to host. In case of failure, |
| 225 | * this reference will be released. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | */ |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 227 | struct nlm_rqst *nlm_alloc_call(struct nlm_host *host) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | { |
| 229 | struct nlm_rqst *call; |
| 230 | |
Trond Myklebust | 36943fa | 2006-03-20 13:44:05 -0500 | [diff] [blame] | 231 | for(;;) { |
| 232 | call = kzalloc(sizeof(*call), GFP_KERNEL); |
| 233 | if (call != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | locks_init_lock(&call->a_args.lock.fl); |
| 235 | locks_init_lock(&call->a_res.lock.fl); |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 236 | call->a_host = host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | return call; |
| 238 | } |
Trond Myklebust | 36943fa | 2006-03-20 13:44:05 -0500 | [diff] [blame] | 239 | if (signalled()) |
| 240 | break; |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 241 | printk("nlm_alloc_call: failed, waiting for memory\n"); |
Nishanth Aravamudan | 041e0e3 | 2005-09-10 00:27:23 -0700 | [diff] [blame] | 242 | schedule_timeout_interruptible(5*HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 244 | nlm_release_host(host); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | return NULL; |
| 246 | } |
| 247 | |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 248 | void nlm_release_call(struct nlm_rqst *call) |
| 249 | { |
| 250 | nlm_release_host(call->a_host); |
| 251 | nlmclnt_release_lockargs(call); |
| 252 | kfree(call); |
| 253 | } |
| 254 | |
| 255 | static void nlmclnt_rpc_release(void *data) |
| 256 | { |
| 257 | return nlm_release_call(data); |
| 258 | } |
| 259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | static int nlm_wait_on_grace(wait_queue_head_t *queue) |
| 261 | { |
| 262 | DEFINE_WAIT(wait); |
| 263 | int status = -EINTR; |
| 264 | |
| 265 | prepare_to_wait(queue, &wait, TASK_INTERRUPTIBLE); |
| 266 | if (!signalled ()) { |
| 267 | schedule_timeout(NLMCLNT_GRACE_WAIT); |
Christoph Lameter | 3e1d1d2 | 2005-06-24 23:13:50 -0700 | [diff] [blame] | 268 | try_to_freeze(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | if (!signalled ()) |
| 270 | status = 0; |
| 271 | } |
| 272 | finish_wait(queue, &wait); |
| 273 | return status; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Generic NLM call |
| 278 | */ |
| 279 | static int |
| 280 | nlmclnt_call(struct nlm_rqst *req, u32 proc) |
| 281 | { |
| 282 | struct nlm_host *host = req->a_host; |
| 283 | struct rpc_clnt *clnt; |
| 284 | struct nlm_args *argp = &req->a_args; |
| 285 | struct nlm_res *resp = &req->a_res; |
| 286 | struct rpc_message msg = { |
| 287 | .rpc_argp = argp, |
| 288 | .rpc_resp = resp, |
| 289 | }; |
| 290 | int status; |
| 291 | |
| 292 | dprintk("lockd: call procedure %d on %s\n", |
| 293 | (int)proc, host->h_name); |
| 294 | |
| 295 | do { |
| 296 | if (host->h_reclaiming && !argp->reclaim) |
| 297 | goto in_grace_period; |
| 298 | |
| 299 | /* If we have no RPC client yet, create one. */ |
| 300 | if ((clnt = nlm_bind_host(host)) == NULL) |
| 301 | return -ENOLCK; |
| 302 | msg.rpc_proc = &clnt->cl_procinfo[proc]; |
| 303 | |
| 304 | /* Perform the RPC call. If an error occurs, try again */ |
| 305 | if ((status = rpc_call_sync(clnt, &msg, 0)) < 0) { |
| 306 | dprintk("lockd: rpc_call returned error %d\n", -status); |
| 307 | switch (status) { |
| 308 | case -EPROTONOSUPPORT: |
| 309 | status = -EINVAL; |
| 310 | break; |
| 311 | case -ECONNREFUSED: |
| 312 | case -ETIMEDOUT: |
| 313 | case -ENOTCONN: |
| 314 | nlm_rebind_host(host); |
| 315 | status = -EAGAIN; |
| 316 | break; |
| 317 | case -ERESTARTSYS: |
| 318 | return signalled () ? -EINTR : status; |
| 319 | default: |
| 320 | break; |
| 321 | } |
| 322 | break; |
| 323 | } else |
| 324 | if (resp->status == NLM_LCK_DENIED_GRACE_PERIOD) { |
| 325 | dprintk("lockd: server in grace period\n"); |
| 326 | if (argp->reclaim) { |
| 327 | printk(KERN_WARNING |
| 328 | "lockd: spurious grace period reject?!\n"); |
| 329 | return -ENOLCK; |
| 330 | } |
| 331 | } else { |
| 332 | if (!argp->reclaim) { |
| 333 | /* We appear to be out of the grace period */ |
| 334 | wake_up_all(&host->h_gracewait); |
| 335 | } |
| 336 | dprintk("lockd: server returns status %d\n", resp->status); |
| 337 | return 0; /* Okay, call complete */ |
| 338 | } |
| 339 | |
| 340 | in_grace_period: |
| 341 | /* |
| 342 | * The server has rebooted and appears to be in the grace |
| 343 | * period during which locks are only allowed to be |
| 344 | * reclaimed. |
| 345 | * We can only back off and try again later. |
| 346 | */ |
| 347 | status = nlm_wait_on_grace(&host->h_gracewait); |
| 348 | } while (status == 0); |
| 349 | |
| 350 | return status; |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * Generic NLM call, async version. |
| 355 | */ |
Trond Myklebust | d471662 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 356 | static int __nlm_async_call(struct nlm_rqst *req, u32 proc, struct rpc_message *msg, const struct rpc_call_ops *tk_ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | { |
| 358 | struct nlm_host *host = req->a_host; |
| 359 | struct rpc_clnt *clnt; |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 360 | int status = -ENOLCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | dprintk("lockd: call procedure %d on %s (async)\n", |
| 363 | (int)proc, host->h_name); |
| 364 | |
| 365 | /* If we have no RPC client yet, create one. */ |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 366 | clnt = nlm_bind_host(host); |
| 367 | if (clnt == NULL) |
| 368 | goto out_err; |
Trond Myklebust | d471662 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 369 | msg->rpc_proc = &clnt->cl_procinfo[proc]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | |
| 371 | /* bootstrap and kick off the async RPC call */ |
Trond Myklebust | d471662 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 372 | status = rpc_call_async(clnt, msg, RPC_TASK_ASYNC, tk_ops, req); |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 373 | if (status == 0) |
| 374 | return 0; |
| 375 | out_err: |
| 376 | nlm_release_call(req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | return status; |
| 378 | } |
| 379 | |
Trond Myklebust | d471662 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 380 | int nlm_async_call(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops) |
| 381 | { |
| 382 | struct rpc_message msg = { |
| 383 | .rpc_argp = &req->a_args, |
| 384 | .rpc_resp = &req->a_res, |
| 385 | }; |
| 386 | return __nlm_async_call(req, proc, &msg, tk_ops); |
| 387 | } |
| 388 | |
| 389 | int nlm_async_reply(struct nlm_rqst *req, u32 proc, const struct rpc_call_ops *tk_ops) |
| 390 | { |
| 391 | struct rpc_message msg = { |
| 392 | .rpc_argp = &req->a_res, |
| 393 | }; |
| 394 | return __nlm_async_call(req, proc, &msg, tk_ops); |
| 395 | } |
| 396 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | /* |
| 398 | * TEST for the presence of a conflicting lock |
| 399 | */ |
| 400 | static int |
| 401 | nlmclnt_test(struct nlm_rqst *req, struct file_lock *fl) |
| 402 | { |
| 403 | int status; |
| 404 | |
| 405 | status = nlmclnt_call(req, NLMPROC_TEST); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | if (status < 0) |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 407 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 409 | switch (req->a_res.status) { |
| 410 | case NLM_LCK_GRANTED: |
| 411 | fl->fl_type = F_UNLCK; |
| 412 | break; |
| 413 | case NLM_LCK_DENIED: |
| 414 | /* |
| 415 | * Report the conflicting lock back to the application. |
| 416 | */ |
| 417 | fl->fl_start = req->a_res.lock.fl.fl_start; |
| 418 | fl->fl_end = req->a_res.lock.fl.fl_start; |
| 419 | fl->fl_type = req->a_res.lock.fl.fl_type; |
| 420 | fl->fl_pid = 0; |
| 421 | break; |
| 422 | default: |
| 423 | status = nlm_stat_to_errno(req->a_res.status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 425 | out: |
| 426 | nlm_release_call(req); |
| 427 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | static void nlmclnt_locks_copy_lock(struct file_lock *new, struct file_lock *fl) |
| 431 | { |
Trond Myklebust | 4c060b5 | 2006-03-20 13:44:41 -0500 | [diff] [blame] | 432 | new->fl_u.nfs_fl.state = fl->fl_u.nfs_fl.state; |
| 433 | new->fl_u.nfs_fl.owner = nlm_get_lockowner(fl->fl_u.nfs_fl.owner); |
| 434 | list_add_tail(&new->fl_u.nfs_fl.list, &fl->fl_u.nfs_fl.owner->host->h_granted); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | static void nlmclnt_locks_release_private(struct file_lock *fl) |
| 438 | { |
Trond Myklebust | 4c060b5 | 2006-03-20 13:44:41 -0500 | [diff] [blame] | 439 | list_del(&fl->fl_u.nfs_fl.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | nlm_put_lockowner(fl->fl_u.nfs_fl.owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | } |
| 442 | |
| 443 | static struct file_lock_operations nlmclnt_lock_ops = { |
| 444 | .fl_copy_lock = nlmclnt_locks_copy_lock, |
| 445 | .fl_release_private = nlmclnt_locks_release_private, |
| 446 | }; |
| 447 | |
| 448 | static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host) |
| 449 | { |
| 450 | BUG_ON(fl->fl_ops != NULL); |
| 451 | fl->fl_u.nfs_fl.state = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | fl->fl_u.nfs_fl.owner = nlm_find_lockowner(host, fl->fl_owner); |
Trond Myklebust | 4c060b5 | 2006-03-20 13:44:41 -0500 | [diff] [blame] | 453 | INIT_LIST_HEAD(&fl->fl_u.nfs_fl.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | fl->fl_ops = &nlmclnt_lock_ops; |
| 455 | } |
| 456 | |
Trond Myklebust | 9b07357 | 2006-06-29 16:38:34 -0400 | [diff] [blame] | 457 | static int do_vfs_lock(struct file_lock *fl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | { |
| 459 | int res = 0; |
| 460 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { |
| 461 | case FL_POSIX: |
| 462 | res = posix_lock_file_wait(fl->fl_file, fl); |
| 463 | break; |
| 464 | case FL_FLOCK: |
| 465 | res = flock_lock_file_wait(fl->fl_file, fl); |
| 466 | break; |
| 467 | default: |
| 468 | BUG(); |
| 469 | } |
Trond Myklebust | 9b07357 | 2006-06-29 16:38:34 -0400 | [diff] [blame] | 470 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | } |
| 472 | |
| 473 | /* |
| 474 | * LOCK: Try to create a lock |
| 475 | * |
| 476 | * Programmer Harassment Alert |
| 477 | * |
| 478 | * When given a blocking lock request in a sync RPC call, the HPUX lockd |
| 479 | * will faithfully return LCK_BLOCKED but never cares to notify us when |
| 480 | * the lock could be granted. This way, our local process could hang |
| 481 | * around forever waiting for the callback. |
| 482 | * |
| 483 | * Solution A: Implement busy-waiting |
| 484 | * Solution B: Use the async version of the call (NLM_LOCK_{MSG,RES}) |
| 485 | * |
| 486 | * For now I am implementing solution A, because I hate the idea of |
| 487 | * re-implementing lockd for a third time in two months. The async |
| 488 | * calls shouldn't be too hard to do, however. |
| 489 | * |
| 490 | * This is one of the lovely things about standards in the NFS area: |
| 491 | * they're so soft and squishy you can't really blame HP for doing this. |
| 492 | */ |
| 493 | static int |
| 494 | nlmclnt_lock(struct nlm_rqst *req, struct file_lock *fl) |
| 495 | { |
| 496 | struct nlm_host *host = req->a_host; |
| 497 | struct nlm_res *resp = &req->a_res; |
Trond Myklebust | 3a649b8 | 2006-03-20 13:44:44 -0500 | [diff] [blame] | 498 | struct nlm_wait *block = NULL; |
Trond Myklebust | 01c3b86 | 2006-06-29 16:38:39 -0400 | [diff] [blame] | 499 | unsigned char fl_flags = fl->fl_flags; |
Trond Myklebust | 3a649b8 | 2006-03-20 13:44:44 -0500 | [diff] [blame] | 500 | int status = -ENOLCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | |
| 502 | if (!host->h_monitored && nsm_monitor(host) < 0) { |
| 503 | printk(KERN_NOTICE "lockd: failed to monitor %s\n", |
| 504 | host->h_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | goto out; |
| 506 | } |
Trond Myklebust | 01c3b86 | 2006-06-29 16:38:39 -0400 | [diff] [blame] | 507 | fl->fl_flags |= FL_ACCESS; |
| 508 | status = do_vfs_lock(fl); |
| 509 | if (status < 0) |
| 510 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
Trond Myklebust | 3a649b8 | 2006-03-20 13:44:44 -0500 | [diff] [blame] | 512 | block = nlmclnt_prepare_block(host, fl); |
Trond Myklebust | 28df955 | 2006-06-09 09:40:27 -0400 | [diff] [blame] | 513 | again: |
Trond Myklebust | ecdbf76 | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 514 | for(;;) { |
Trond Myklebust | 28df955 | 2006-06-09 09:40:27 -0400 | [diff] [blame] | 515 | /* Reboot protection */ |
| 516 | fl->fl_u.nfs_fl.state = host->h_state; |
Trond Myklebust | ecdbf76 | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 517 | status = nlmclnt_call(req, NLMPROC_LOCK); |
| 518 | if (status < 0) |
| 519 | goto out_unblock; |
Trond Myklebust | 3a649b8 | 2006-03-20 13:44:44 -0500 | [diff] [blame] | 520 | if (!req->a_args.block) |
Trond Myklebust | ecdbf76 | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 521 | break; |
Trond Myklebust | ecdbf76 | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 522 | /* Did a reclaimer thread notify us of a server reboot? */ |
| 523 | if (resp->status == NLM_LCK_DENIED_GRACE_PERIOD) |
| 524 | continue; |
| 525 | if (resp->status != NLM_LCK_BLOCKED) |
| 526 | break; |
Trond Myklebust | 3a649b8 | 2006-03-20 13:44:44 -0500 | [diff] [blame] | 527 | /* Wait on an NLM blocking lock */ |
| 528 | status = nlmclnt_block(block, req, NLMCLNT_POLL_TIMEOUT); |
| 529 | /* if we were interrupted. Send a CANCEL request to the server |
Trond Myklebust | ecdbf76 | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 530 | * and exit |
| 531 | */ |
Trond Myklebust | 3a649b8 | 2006-03-20 13:44:44 -0500 | [diff] [blame] | 532 | if (status < 0) |
| 533 | goto out_unblock; |
| 534 | if (resp->status != NLM_LCK_BLOCKED) |
| 535 | break; |
Trond Myklebust | ecdbf76 | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 536 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
| 538 | if (resp->status == NLM_LCK_GRANTED) { |
Trond Myklebust | 28df955 | 2006-06-09 09:40:27 -0400 | [diff] [blame] | 539 | down_read(&host->h_rwsem); |
| 540 | /* Check whether or not the server has rebooted */ |
| 541 | if (fl->fl_u.nfs_fl.state != host->h_state) { |
| 542 | up_read(&host->h_rwsem); |
| 543 | goto again; |
| 544 | } |
Trond Myklebust | 4c060b5 | 2006-03-20 13:44:41 -0500 | [diff] [blame] | 545 | /* Ensure the resulting lock will get added to granted list */ |
Trond Myklebust | 01c3b86 | 2006-06-29 16:38:39 -0400 | [diff] [blame] | 546 | fl->fl_flags = fl_flags | FL_SLEEP; |
Trond Myklebust | 9b07357 | 2006-06-29 16:38:34 -0400 | [diff] [blame] | 547 | if (do_vfs_lock(fl) < 0) |
| 548 | printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__); |
Trond Myklebust | 28df955 | 2006-06-09 09:40:27 -0400 | [diff] [blame] | 549 | up_read(&host->h_rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | } |
| 551 | status = nlm_stat_to_errno(resp->status); |
Trond Myklebust | ecdbf76 | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 552 | out_unblock: |
Trond Myklebust | 3a649b8 | 2006-03-20 13:44:44 -0500 | [diff] [blame] | 553 | nlmclnt_finish_block(block); |
Trond Myklebust | ecdbf76 | 2005-06-22 17:16:31 +0000 | [diff] [blame] | 554 | /* Cancel the blocked request if it is still pending */ |
| 555 | if (resp->status == NLM_LCK_BLOCKED) |
Trond Myklebust | 16fb242 | 2006-02-01 12:18:22 -0500 | [diff] [blame] | 556 | nlmclnt_cancel(host, req->a_args.block, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | out: |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 558 | nlm_release_call(req); |
Trond Myklebust | 01c3b86 | 2006-06-29 16:38:39 -0400 | [diff] [blame] | 559 | fl->fl_flags = fl_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | return status; |
| 561 | } |
| 562 | |
| 563 | /* |
| 564 | * RECLAIM: Try to reclaim a lock |
| 565 | */ |
| 566 | int |
| 567 | nlmclnt_reclaim(struct nlm_host *host, struct file_lock *fl) |
| 568 | { |
| 569 | struct nlm_rqst reqst, *req; |
| 570 | int status; |
| 571 | |
| 572 | req = &reqst; |
| 573 | memset(req, 0, sizeof(*req)); |
| 574 | locks_init_lock(&req->a_args.lock.fl); |
| 575 | locks_init_lock(&req->a_res.lock.fl); |
| 576 | req->a_host = host; |
| 577 | req->a_flags = 0; |
| 578 | |
| 579 | /* Set up the argument struct */ |
| 580 | nlmclnt_setlockargs(req, fl); |
| 581 | req->a_args.reclaim = 1; |
| 582 | |
| 583 | if ((status = nlmclnt_call(req, NLMPROC_LOCK)) >= 0 |
| 584 | && req->a_res.status == NLM_LCK_GRANTED) |
| 585 | return 0; |
| 586 | |
| 587 | printk(KERN_WARNING "lockd: failed to reclaim lock for pid %d " |
| 588 | "(errno %d, status %d)\n", fl->fl_pid, |
| 589 | status, req->a_res.status); |
| 590 | |
| 591 | /* |
| 592 | * FIXME: This is a serious failure. We can |
| 593 | * |
| 594 | * a. Ignore the problem |
| 595 | * b. Send the owning process some signal (Linux doesn't have |
| 596 | * SIGLOST, though...) |
| 597 | * c. Retry the operation |
| 598 | * |
| 599 | * Until someone comes up with a simple implementation |
| 600 | * for b or c, I'll choose option a. |
| 601 | */ |
| 602 | |
| 603 | return -ENOLCK; |
| 604 | } |
| 605 | |
| 606 | /* |
| 607 | * UNLOCK: remove an existing lock |
| 608 | */ |
| 609 | static int |
| 610 | nlmclnt_unlock(struct nlm_rqst *req, struct file_lock *fl) |
| 611 | { |
Trond Myklebust | 28df955 | 2006-06-09 09:40:27 -0400 | [diff] [blame] | 612 | struct nlm_host *host = req->a_host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | struct nlm_res *resp = &req->a_res; |
Trond Myklebust | 9b07357 | 2006-06-29 16:38:34 -0400 | [diff] [blame] | 614 | int status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | |
Christoph Hellwig | 26bcbf9 | 2006-03-20 13:44:40 -0500 | [diff] [blame] | 616 | /* |
Trond Myklebust | 30f4e20 | 2006-03-13 21:20:49 -0800 | [diff] [blame] | 617 | * Note: the server is supposed to either grant us the unlock |
| 618 | * request, or to deny it with NLM_LCK_DENIED_GRACE_PERIOD. In either |
| 619 | * case, we want to unlock. |
| 620 | */ |
Trond Myklebust | 9b07357 | 2006-06-29 16:38:34 -0400 | [diff] [blame] | 621 | fl->fl_flags |= FL_EXISTS; |
Trond Myklebust | 28df955 | 2006-06-09 09:40:27 -0400 | [diff] [blame] | 622 | down_read(&host->h_rwsem); |
Trond Myklebust | 9b07357 | 2006-06-29 16:38:34 -0400 | [diff] [blame] | 623 | if (do_vfs_lock(fl) == -ENOENT) { |
| 624 | up_read(&host->h_rwsem); |
| 625 | goto out; |
| 626 | } |
Trond Myklebust | 28df955 | 2006-06-09 09:40:27 -0400 | [diff] [blame] | 627 | up_read(&host->h_rwsem); |
Trond Myklebust | 30f4e20 | 2006-03-13 21:20:49 -0800 | [diff] [blame] | 628 | |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 629 | if (req->a_flags & RPC_TASK_ASYNC) |
| 630 | return nlm_async_call(req, NLMPROC_UNLOCK, &nlmclnt_unlock_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
| 632 | status = nlmclnt_call(req, NLMPROC_UNLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | if (status < 0) |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 634 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | if (resp->status == NLM_LCK_GRANTED) |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 637 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | |
| 639 | if (resp->status != NLM_LCK_DENIED_NOLOCKS) |
| 640 | printk("lockd: unexpected unlock status: %d\n", resp->status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | /* What to do now? I'm out of my depth... */ |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 642 | status = -ENOLCK; |
| 643 | out: |
| 644 | nlm_release_call(req); |
| 645 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | } |
| 647 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 648 | static void nlmclnt_unlock_callback(struct rpc_task *task, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 650 | struct nlm_rqst *req = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | int status = req->a_res.status; |
| 652 | |
| 653 | if (RPC_ASSASSINATED(task)) |
| 654 | goto die; |
| 655 | |
| 656 | if (task->tk_status < 0) { |
| 657 | dprintk("lockd: unlock failed (err = %d)\n", -task->tk_status); |
| 658 | goto retry_rebind; |
| 659 | } |
| 660 | if (status == NLM_LCK_DENIED_GRACE_PERIOD) { |
| 661 | rpc_delay(task, NLMCLNT_GRACE_WAIT); |
| 662 | goto retry_unlock; |
| 663 | } |
| 664 | if (status != NLM_LCK_GRANTED) |
| 665 | printk(KERN_WARNING "lockd: unexpected unlock status: %d\n", status); |
| 666 | die: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | return; |
| 668 | retry_rebind: |
| 669 | nlm_rebind_host(req->a_host); |
| 670 | retry_unlock: |
| 671 | rpc_restart_call(task); |
| 672 | } |
| 673 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 674 | static const struct rpc_call_ops nlmclnt_unlock_ops = { |
| 675 | .rpc_call_done = nlmclnt_unlock_callback, |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 676 | .rpc_release = nlmclnt_rpc_release, |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 677 | }; |
| 678 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | /* |
| 680 | * Cancel a blocked lock request. |
| 681 | * We always use an async RPC call for this in order not to hang a |
| 682 | * process that has been Ctrl-C'ed. |
| 683 | */ |
Trond Myklebust | 16fb242 | 2006-02-01 12:18:22 -0500 | [diff] [blame] | 684 | static int nlmclnt_cancel(struct nlm_host *host, int block, struct file_lock *fl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | { |
| 686 | struct nlm_rqst *req; |
| 687 | unsigned long flags; |
| 688 | sigset_t oldset; |
| 689 | int status; |
| 690 | |
| 691 | /* Block all signals while setting up call */ |
| 692 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 693 | oldset = current->blocked; |
| 694 | sigfillset(¤t->blocked); |
| 695 | recalc_sigpending(); |
| 696 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
| 697 | |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 698 | req = nlm_alloc_call(nlm_get_host(host)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | if (!req) |
| 700 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | req->a_flags = RPC_TASK_ASYNC; |
| 702 | |
| 703 | nlmclnt_setlockargs(req, fl); |
Trond Myklebust | 16fb242 | 2006-02-01 12:18:22 -0500 | [diff] [blame] | 704 | req->a_args.block = block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 706 | status = nlm_async_call(req, NLMPROC_CANCEL, &nlmclnt_cancel_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
| 708 | spin_lock_irqsave(¤t->sighand->siglock, flags); |
| 709 | current->blocked = oldset; |
| 710 | recalc_sigpending(); |
| 711 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
| 712 | |
| 713 | return status; |
| 714 | } |
| 715 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 716 | static void nlmclnt_cancel_callback(struct rpc_task *task, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | { |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 718 | struct nlm_rqst *req = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
| 720 | if (RPC_ASSASSINATED(task)) |
| 721 | goto die; |
| 722 | |
| 723 | if (task->tk_status < 0) { |
| 724 | dprintk("lockd: CANCEL call error %d, retrying.\n", |
| 725 | task->tk_status); |
| 726 | goto retry_cancel; |
| 727 | } |
| 728 | |
| 729 | dprintk("lockd: cancel status %d (task %d)\n", |
| 730 | req->a_res.status, task->tk_pid); |
| 731 | |
| 732 | switch (req->a_res.status) { |
| 733 | case NLM_LCK_GRANTED: |
| 734 | case NLM_LCK_DENIED_GRACE_PERIOD: |
Trond Myklebust | 35576cb | 2006-03-20 13:44:41 -0500 | [diff] [blame] | 735 | case NLM_LCK_DENIED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | /* Everything's good */ |
| 737 | break; |
| 738 | case NLM_LCK_DENIED_NOLOCKS: |
| 739 | dprintk("lockd: CANCEL failed (server has no locks)\n"); |
| 740 | goto retry_cancel; |
| 741 | default: |
| 742 | printk(KERN_NOTICE "lockd: weird return %d for CANCEL call\n", |
| 743 | req->a_res.status); |
| 744 | } |
| 745 | |
| 746 | die: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | return; |
| 748 | |
| 749 | retry_cancel: |
Trond Myklebust | aaaa994 | 2006-02-01 12:18:25 -0500 | [diff] [blame] | 750 | /* Don't ever retry more than 3 times */ |
| 751 | if (req->a_retries++ >= NLMCLNT_MAX_RETRIES) |
| 752 | goto die; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | nlm_rebind_host(req->a_host); |
| 754 | rpc_restart_call(task); |
| 755 | rpc_delay(task, 30 * HZ); |
| 756 | } |
| 757 | |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 758 | static const struct rpc_call_ops nlmclnt_cancel_ops = { |
| 759 | .rpc_call_done = nlmclnt_cancel_callback, |
Trond Myklebust | 9273723 | 2006-03-20 13:44:45 -0500 | [diff] [blame] | 760 | .rpc_release = nlmclnt_rpc_release, |
Trond Myklebust | 963d8fe | 2006-01-03 09:55:04 +0100 | [diff] [blame] | 761 | }; |
| 762 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | /* |
| 764 | * Convert an NLM status code to a generic kernel errno |
| 765 | */ |
| 766 | static int |
| 767 | nlm_stat_to_errno(u32 status) |
| 768 | { |
| 769 | switch(status) { |
| 770 | case NLM_LCK_GRANTED: |
| 771 | return 0; |
| 772 | case NLM_LCK_DENIED: |
| 773 | return -EAGAIN; |
| 774 | case NLM_LCK_DENIED_NOLOCKS: |
| 775 | case NLM_LCK_DENIED_GRACE_PERIOD: |
| 776 | return -ENOLCK; |
| 777 | case NLM_LCK_BLOCKED: |
| 778 | printk(KERN_NOTICE "lockd: unexpected status NLM_BLOCKED\n"); |
| 779 | return -ENOLCK; |
| 780 | #ifdef CONFIG_LOCKD_V4 |
| 781 | case NLM_DEADLCK: |
| 782 | return -EDEADLK; |
| 783 | case NLM_ROFS: |
| 784 | return -EROFS; |
| 785 | case NLM_STALE_FH: |
| 786 | return -ESTALE; |
| 787 | case NLM_FBIG: |
| 788 | return -EOVERFLOW; |
| 789 | case NLM_FAILED: |
| 790 | return -ENOLCK; |
| 791 | #endif |
| 792 | } |
| 793 | printk(KERN_NOTICE "lockd: unexpected server status %d\n", status); |
| 794 | return -ENOLCK; |
| 795 | } |