Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/delegation.c |
| 3 | * |
| 4 | * Copyright (C) 2004 Trond Myklebust |
| 5 | * |
| 6 | * NFS file delegation management |
| 7 | * |
| 8 | */ |
| 9 | #include <linux/config.h> |
| 10 | #include <linux/completion.h> |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 11 | #include <linux/kthread.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/module.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/spinlock.h> |
| 15 | |
| 16 | #include <linux/nfs4.h> |
| 17 | #include <linux/nfs_fs.h> |
| 18 | #include <linux/nfs_xdr.h> |
| 19 | |
Trond Myklebust | 4ce7971 | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 20 | #include "nfs4_fs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include "delegation.h" |
| 22 | |
| 23 | static struct nfs_delegation *nfs_alloc_delegation(void) |
| 24 | { |
| 25 | return (struct nfs_delegation *)kmalloc(sizeof(struct nfs_delegation), GFP_KERNEL); |
| 26 | } |
| 27 | |
| 28 | static void nfs_free_delegation(struct nfs_delegation *delegation) |
| 29 | { |
| 30 | if (delegation->cred) |
| 31 | put_rpccred(delegation->cred); |
| 32 | kfree(delegation); |
| 33 | } |
| 34 | |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 35 | static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state) |
| 36 | { |
| 37 | struct inode *inode = state->inode; |
| 38 | struct file_lock *fl; |
| 39 | int status; |
| 40 | |
| 41 | for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) { |
| 42 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
| 43 | continue; |
| 44 | if ((struct nfs_open_context *)fl->fl_file->private_data != ctx) |
| 45 | continue; |
| 46 | status = nfs4_lock_delegation_recall(state, fl); |
| 47 | if (status >= 0) |
| 48 | continue; |
| 49 | switch (status) { |
| 50 | default: |
| 51 | printk(KERN_ERR "%s: unhandled error %d.\n", |
| 52 | __FUNCTION__, status); |
| 53 | case -NFS4ERR_EXPIRED: |
| 54 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
| 55 | case -NFS4ERR_STALE_CLIENTID: |
| 56 | nfs4_schedule_state_recovery(NFS_SERVER(inode)->nfs4_state); |
| 57 | goto out_err; |
| 58 | } |
| 59 | } |
| 60 | return 0; |
| 61 | out_err: |
| 62 | return status; |
| 63 | } |
| 64 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | static void nfs_delegation_claim_opens(struct inode *inode) |
| 66 | { |
| 67 | struct nfs_inode *nfsi = NFS_I(inode); |
| 68 | struct nfs_open_context *ctx; |
| 69 | struct nfs4_state *state; |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 70 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | again: |
| 73 | spin_lock(&inode->i_lock); |
| 74 | list_for_each_entry(ctx, &nfsi->open_files, list) { |
| 75 | state = ctx->state; |
| 76 | if (state == NULL) |
| 77 | continue; |
| 78 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) |
| 79 | continue; |
| 80 | get_nfs_open_context(ctx); |
| 81 | spin_unlock(&inode->i_lock); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 82 | err = nfs4_open_delegation_recall(ctx->dentry, state); |
| 83 | if (err >= 0) |
| 84 | err = nfs_delegation_claim_locks(ctx, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | put_nfs_open_context(ctx); |
Trond Myklebust | 888e694 | 2005-11-04 15:38:11 -0500 | [diff] [blame] | 86 | if (err != 0) |
| 87 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | goto again; |
| 89 | } |
| 90 | spin_unlock(&inode->i_lock); |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Set up a delegation on an inode |
| 95 | */ |
| 96 | void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) |
| 97 | { |
| 98 | struct nfs_delegation *delegation = NFS_I(inode)->delegation; |
| 99 | |
| 100 | if (delegation == NULL) |
| 101 | return; |
| 102 | memcpy(delegation->stateid.data, res->delegation.data, |
| 103 | sizeof(delegation->stateid.data)); |
| 104 | delegation->type = res->delegation_type; |
| 105 | delegation->maxsize = res->maxsize; |
| 106 | put_rpccred(cred); |
| 107 | delegation->cred = get_rpccred(cred); |
| 108 | delegation->flags &= ~NFS_DELEGATION_NEED_RECLAIM; |
| 109 | NFS_I(inode)->delegation_state = delegation->type; |
| 110 | smp_wmb(); |
| 111 | } |
| 112 | |
| 113 | /* |
| 114 | * Set up a delegation on an inode |
| 115 | */ |
| 116 | int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res) |
| 117 | { |
| 118 | struct nfs4_client *clp = NFS_SERVER(inode)->nfs4_state; |
| 119 | struct nfs_inode *nfsi = NFS_I(inode); |
| 120 | struct nfs_delegation *delegation; |
| 121 | int status = 0; |
| 122 | |
Trond Myklebust | b3c52da | 2005-10-17 06:02:00 -0400 | [diff] [blame] | 123 | /* Ensure we first revalidate the attributes and page cache! */ |
| 124 | if ((nfsi->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATTR))) |
| 125 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | delegation = nfs_alloc_delegation(); |
| 128 | if (delegation == NULL) |
| 129 | return -ENOMEM; |
| 130 | memcpy(delegation->stateid.data, res->delegation.data, |
| 131 | sizeof(delegation->stateid.data)); |
| 132 | delegation->type = res->delegation_type; |
| 133 | delegation->maxsize = res->maxsize; |
Trond Myklebust | beb2a5e | 2006-01-03 09:55:37 +0100 | [diff] [blame] | 134 | delegation->change_attr = nfsi->change_attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | delegation->cred = get_rpccred(cred); |
| 136 | delegation->inode = inode; |
| 137 | |
| 138 | spin_lock(&clp->cl_lock); |
| 139 | if (nfsi->delegation == NULL) { |
| 140 | list_add(&delegation->super_list, &clp->cl_delegations); |
| 141 | nfsi->delegation = delegation; |
| 142 | nfsi->delegation_state = delegation->type; |
| 143 | delegation = NULL; |
| 144 | } else { |
| 145 | if (memcmp(&delegation->stateid, &nfsi->delegation->stateid, |
| 146 | sizeof(delegation->stateid)) != 0 || |
| 147 | delegation->type != nfsi->delegation->type) { |
| 148 | printk("%s: server %u.%u.%u.%u, handed out a duplicate delegation!\n", |
| 149 | __FUNCTION__, NIPQUAD(clp->cl_addr)); |
| 150 | status = -EIO; |
| 151 | } |
| 152 | } |
| 153 | spin_unlock(&clp->cl_lock); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 154 | kfree(delegation); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | return status; |
| 156 | } |
| 157 | |
| 158 | static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation) |
| 159 | { |
| 160 | int res = 0; |
| 161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid); |
| 163 | nfs_free_delegation(delegation); |
| 164 | return res; |
| 165 | } |
| 166 | |
| 167 | /* Sync all data to disk upon delegation return */ |
| 168 | static void nfs_msync_inode(struct inode *inode) |
| 169 | { |
| 170 | filemap_fdatawrite(inode->i_mapping); |
| 171 | nfs_wb_all(inode); |
| 172 | filemap_fdatawait(inode->i_mapping); |
| 173 | } |
| 174 | |
| 175 | /* |
| 176 | * Basic procedure for returning a delegation to the server |
| 177 | */ |
Trond Myklebust | cae7a07 | 2005-10-18 14:20:19 -0700 | [diff] [blame] | 178 | int __nfs_inode_return_delegation(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
| 180 | struct nfs4_client *clp = NFS_SERVER(inode)->nfs4_state; |
| 181 | struct nfs_inode *nfsi = NFS_I(inode); |
| 182 | struct nfs_delegation *delegation; |
| 183 | int res = 0; |
| 184 | |
| 185 | nfs_msync_inode(inode); |
| 186 | down_read(&clp->cl_sem); |
| 187 | /* Guard against new delegated open calls */ |
| 188 | down_write(&nfsi->rwsem); |
| 189 | spin_lock(&clp->cl_lock); |
| 190 | delegation = nfsi->delegation; |
| 191 | if (delegation != NULL) { |
| 192 | list_del_init(&delegation->super_list); |
| 193 | nfsi->delegation = NULL; |
| 194 | nfsi->delegation_state = 0; |
| 195 | } |
| 196 | spin_unlock(&clp->cl_lock); |
| 197 | nfs_delegation_claim_opens(inode); |
| 198 | up_write(&nfsi->rwsem); |
| 199 | up_read(&clp->cl_sem); |
| 200 | nfs_msync_inode(inode); |
| 201 | |
| 202 | if (delegation != NULL) |
| 203 | res = nfs_do_return_delegation(inode, delegation); |
| 204 | return res; |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * Return all delegations associated to a super block |
| 209 | */ |
| 210 | void nfs_return_all_delegations(struct super_block *sb) |
| 211 | { |
| 212 | struct nfs4_client *clp = NFS_SB(sb)->nfs4_state; |
| 213 | struct nfs_delegation *delegation; |
| 214 | struct inode *inode; |
| 215 | |
| 216 | if (clp == NULL) |
| 217 | return; |
| 218 | restart: |
| 219 | spin_lock(&clp->cl_lock); |
| 220 | list_for_each_entry(delegation, &clp->cl_delegations, super_list) { |
| 221 | if (delegation->inode->i_sb != sb) |
| 222 | continue; |
| 223 | inode = igrab(delegation->inode); |
| 224 | if (inode == NULL) |
| 225 | continue; |
| 226 | spin_unlock(&clp->cl_lock); |
| 227 | nfs_inode_return_delegation(inode); |
| 228 | iput(inode); |
| 229 | goto restart; |
| 230 | } |
| 231 | spin_unlock(&clp->cl_lock); |
| 232 | } |
| 233 | |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 234 | int nfs_do_expire_all_delegations(void *ptr) |
| 235 | { |
| 236 | struct nfs4_client *clp = ptr; |
| 237 | struct nfs_delegation *delegation; |
| 238 | struct inode *inode; |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 239 | |
| 240 | allow_signal(SIGKILL); |
| 241 | restart: |
| 242 | spin_lock(&clp->cl_lock); |
| 243 | if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) != 0) |
| 244 | goto out; |
| 245 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) |
| 246 | goto out; |
| 247 | list_for_each_entry(delegation, &clp->cl_delegations, super_list) { |
| 248 | inode = igrab(delegation->inode); |
| 249 | if (inode == NULL) |
| 250 | continue; |
| 251 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 26c78e1 | 2006-01-03 09:55:58 +0100 | [diff] [blame] | 252 | nfs_inode_return_delegation(inode); |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 253 | iput(inode); |
Trond Myklebust | 26c78e1 | 2006-01-03 09:55:58 +0100 | [diff] [blame] | 254 | goto restart; |
Trond Myklebust | 58d9714 | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 255 | } |
| 256 | out: |
| 257 | spin_unlock(&clp->cl_lock); |
| 258 | nfs4_put_client(clp); |
| 259 | module_put_and_exit(0); |
| 260 | } |
| 261 | |
| 262 | void nfs_expire_all_delegations(struct nfs4_client *clp) |
| 263 | { |
| 264 | struct task_struct *task; |
| 265 | |
| 266 | __module_get(THIS_MODULE); |
| 267 | atomic_inc(&clp->cl_count); |
| 268 | task = kthread_run(nfs_do_expire_all_delegations, clp, |
| 269 | "%u.%u.%u.%u-delegreturn", |
| 270 | NIPQUAD(clp->cl_addr)); |
| 271 | if (!IS_ERR(task)) |
| 272 | return; |
| 273 | nfs4_put_client(clp); |
| 274 | module_put(THIS_MODULE); |
| 275 | } |
| 276 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | /* |
| 278 | * Return all delegations following an NFS4ERR_CB_PATH_DOWN error. |
| 279 | */ |
| 280 | void nfs_handle_cb_pathdown(struct nfs4_client *clp) |
| 281 | { |
| 282 | struct nfs_delegation *delegation; |
| 283 | struct inode *inode; |
| 284 | |
| 285 | if (clp == NULL) |
| 286 | return; |
| 287 | restart: |
| 288 | spin_lock(&clp->cl_lock); |
| 289 | list_for_each_entry(delegation, &clp->cl_delegations, super_list) { |
| 290 | inode = igrab(delegation->inode); |
| 291 | if (inode == NULL) |
| 292 | continue; |
| 293 | spin_unlock(&clp->cl_lock); |
| 294 | nfs_inode_return_delegation(inode); |
| 295 | iput(inode); |
| 296 | goto restart; |
| 297 | } |
| 298 | spin_unlock(&clp->cl_lock); |
| 299 | } |
| 300 | |
| 301 | struct recall_threadargs { |
| 302 | struct inode *inode; |
| 303 | struct nfs4_client *clp; |
| 304 | const nfs4_stateid *stateid; |
| 305 | |
| 306 | struct completion started; |
| 307 | int result; |
| 308 | }; |
| 309 | |
| 310 | static int recall_thread(void *data) |
| 311 | { |
| 312 | struct recall_threadargs *args = (struct recall_threadargs *)data; |
| 313 | struct inode *inode = igrab(args->inode); |
| 314 | struct nfs4_client *clp = NFS_SERVER(inode)->nfs4_state; |
| 315 | struct nfs_inode *nfsi = NFS_I(inode); |
| 316 | struct nfs_delegation *delegation; |
| 317 | |
| 318 | daemonize("nfsv4-delegreturn"); |
| 319 | |
| 320 | nfs_msync_inode(inode); |
| 321 | down_read(&clp->cl_sem); |
| 322 | down_write(&nfsi->rwsem); |
| 323 | spin_lock(&clp->cl_lock); |
| 324 | delegation = nfsi->delegation; |
| 325 | if (delegation != NULL && memcmp(delegation->stateid.data, |
| 326 | args->stateid->data, |
| 327 | sizeof(delegation->stateid.data)) == 0) { |
| 328 | list_del_init(&delegation->super_list); |
| 329 | nfsi->delegation = NULL; |
| 330 | nfsi->delegation_state = 0; |
| 331 | args->result = 0; |
| 332 | } else { |
| 333 | delegation = NULL; |
| 334 | args->result = -ENOENT; |
| 335 | } |
| 336 | spin_unlock(&clp->cl_lock); |
| 337 | complete(&args->started); |
| 338 | nfs_delegation_claim_opens(inode); |
| 339 | up_write(&nfsi->rwsem); |
| 340 | up_read(&clp->cl_sem); |
| 341 | nfs_msync_inode(inode); |
| 342 | |
| 343 | if (delegation != NULL) |
| 344 | nfs_do_return_delegation(inode, delegation); |
| 345 | iput(inode); |
| 346 | module_put_and_exit(0); |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * Asynchronous delegation recall! |
| 351 | */ |
| 352 | int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid) |
| 353 | { |
| 354 | struct recall_threadargs data = { |
| 355 | .inode = inode, |
| 356 | .stateid = stateid, |
| 357 | }; |
| 358 | int status; |
| 359 | |
| 360 | init_completion(&data.started); |
| 361 | __module_get(THIS_MODULE); |
| 362 | status = kernel_thread(recall_thread, &data, CLONE_KERNEL); |
| 363 | if (status < 0) |
| 364 | goto out_module_put; |
| 365 | wait_for_completion(&data.started); |
| 366 | return data.result; |
| 367 | out_module_put: |
| 368 | module_put(THIS_MODULE); |
| 369 | return status; |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * Retrieve the inode associated with a delegation |
| 374 | */ |
| 375 | struct inode *nfs_delegation_find_inode(struct nfs4_client *clp, const struct nfs_fh *fhandle) |
| 376 | { |
| 377 | struct nfs_delegation *delegation; |
| 378 | struct inode *res = NULL; |
| 379 | spin_lock(&clp->cl_lock); |
| 380 | list_for_each_entry(delegation, &clp->cl_delegations, super_list) { |
| 381 | if (nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) { |
| 382 | res = igrab(delegation->inode); |
| 383 | break; |
| 384 | } |
| 385 | } |
| 386 | spin_unlock(&clp->cl_lock); |
| 387 | return res; |
| 388 | } |
| 389 | |
| 390 | /* |
| 391 | * Mark all delegations as needing to be reclaimed |
| 392 | */ |
| 393 | void nfs_delegation_mark_reclaim(struct nfs4_client *clp) |
| 394 | { |
| 395 | struct nfs_delegation *delegation; |
| 396 | spin_lock(&clp->cl_lock); |
| 397 | list_for_each_entry(delegation, &clp->cl_delegations, super_list) |
| 398 | delegation->flags |= NFS_DELEGATION_NEED_RECLAIM; |
| 399 | spin_unlock(&clp->cl_lock); |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Reap all unclaimed delegations after reboot recovery is done |
| 404 | */ |
| 405 | void nfs_delegation_reap_unclaimed(struct nfs4_client *clp) |
| 406 | { |
| 407 | struct nfs_delegation *delegation, *n; |
| 408 | LIST_HEAD(head); |
| 409 | spin_lock(&clp->cl_lock); |
| 410 | list_for_each_entry_safe(delegation, n, &clp->cl_delegations, super_list) { |
| 411 | if ((delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0) |
| 412 | continue; |
| 413 | list_move(&delegation->super_list, &head); |
| 414 | NFS_I(delegation->inode)->delegation = NULL; |
| 415 | NFS_I(delegation->inode)->delegation_state = 0; |
| 416 | } |
| 417 | spin_unlock(&clp->cl_lock); |
| 418 | while(!list_empty(&head)) { |
| 419 | delegation = list_entry(head.next, struct nfs_delegation, super_list); |
| 420 | list_del(&delegation->super_list); |
| 421 | nfs_free_delegation(delegation); |
| 422 | } |
| 423 | } |