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1 | /* | |
2 | * fs/nfs/nfs4proc.c | |
3 | * | |
4 | * Client-side procedure declarations for NFSv4. | |
5 | * | |
6 | * Copyright (c) 2002 The Regents of the University of Michigan. | |
7 | * All rights reserved. | |
8 | * | |
9 | * Kendrick Smith <kmsmith@umich.edu> | |
10 | * Andy Adamson <andros@umich.edu> | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or without | |
13 | * modification, are permitted provided that the following conditions | |
14 | * are met: | |
15 | * | |
16 | * 1. Redistributions of source code must retain the above copyright | |
17 | * notice, this list of conditions and the following disclaimer. | |
18 | * 2. Redistributions in binary form must reproduce the above copyright | |
19 | * notice, this list of conditions and the following disclaimer in the | |
20 | * documentation and/or other materials provided with the distribution. | |
21 | * 3. Neither the name of the University nor the names of its | |
22 | * contributors may be used to endorse or promote products derived | |
23 | * from this software without specific prior written permission. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
26 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
27 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
28 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
32 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
33 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
34 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
35 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
36 | */ | |
37 | ||
38 | #include <linux/mm.h> | |
39 | #include <linux/utsname.h> | |
40 | #include <linux/delay.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/string.h> | |
43 | #include <linux/sunrpc/clnt.h> | |
44 | #include <linux/nfs.h> | |
45 | #include <linux/nfs4.h> | |
46 | #include <linux/nfs_fs.h> | |
47 | #include <linux/nfs_page.h> | |
48 | #include <linux/smp_lock.h> | |
49 | #include <linux/namei.h> | |
50 | #include <linux/mount.h> | |
51 | ||
52 | #include "nfs4_fs.h" | |
53 | #include "delegation.h" | |
54 | #include "iostat.h" | |
55 | ||
56 | #define NFSDBG_FACILITY NFSDBG_PROC | |
57 | ||
58 | #define NFS4_POLL_RETRY_MIN (1*HZ) | |
59 | #define NFS4_POLL_RETRY_MAX (15*HZ) | |
60 | ||
61 | struct nfs4_opendata; | |
62 | static int _nfs4_proc_open(struct nfs4_opendata *data); | |
63 | static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); | |
64 | static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *); | |
65 | static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry); | |
66 | static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception); | |
67 | static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp); | |
68 | extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus); | |
69 | extern struct rpc_procinfo nfs4_procedures[]; | |
70 | ||
71 | /* Prevent leaks of NFSv4 errors into userland */ | |
72 | int nfs4_map_errors(int err) | |
73 | { | |
74 | if (err < -1000) { | |
75 | dprintk("%s could not handle NFSv4 error %d\n", | |
76 | __FUNCTION__, -err); | |
77 | return -EIO; | |
78 | } | |
79 | return err; | |
80 | } | |
81 | ||
82 | /* | |
83 | * This is our standard bitmap for GETATTR requests. | |
84 | */ | |
85 | const u32 nfs4_fattr_bitmap[2] = { | |
86 | FATTR4_WORD0_TYPE | |
87 | | FATTR4_WORD0_CHANGE | |
88 | | FATTR4_WORD0_SIZE | |
89 | | FATTR4_WORD0_FSID | |
90 | | FATTR4_WORD0_FILEID, | |
91 | FATTR4_WORD1_MODE | |
92 | | FATTR4_WORD1_NUMLINKS | |
93 | | FATTR4_WORD1_OWNER | |
94 | | FATTR4_WORD1_OWNER_GROUP | |
95 | | FATTR4_WORD1_RAWDEV | |
96 | | FATTR4_WORD1_SPACE_USED | |
97 | | FATTR4_WORD1_TIME_ACCESS | |
98 | | FATTR4_WORD1_TIME_METADATA | |
99 | | FATTR4_WORD1_TIME_MODIFY | |
100 | }; | |
101 | ||
102 | const u32 nfs4_statfs_bitmap[2] = { | |
103 | FATTR4_WORD0_FILES_AVAIL | |
104 | | FATTR4_WORD0_FILES_FREE | |
105 | | FATTR4_WORD0_FILES_TOTAL, | |
106 | FATTR4_WORD1_SPACE_AVAIL | |
107 | | FATTR4_WORD1_SPACE_FREE | |
108 | | FATTR4_WORD1_SPACE_TOTAL | |
109 | }; | |
110 | ||
111 | const u32 nfs4_pathconf_bitmap[2] = { | |
112 | FATTR4_WORD0_MAXLINK | |
113 | | FATTR4_WORD0_MAXNAME, | |
114 | 0 | |
115 | }; | |
116 | ||
117 | const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE | |
118 | | FATTR4_WORD0_MAXREAD | |
119 | | FATTR4_WORD0_MAXWRITE | |
120 | | FATTR4_WORD0_LEASE_TIME, | |
121 | 0 | |
122 | }; | |
123 | ||
124 | static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry, | |
125 | struct nfs4_readdir_arg *readdir) | |
126 | { | |
127 | u32 *start, *p; | |
128 | ||
129 | BUG_ON(readdir->count < 80); | |
130 | if (cookie > 2) { | |
131 | readdir->cookie = cookie; | |
132 | memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); | |
133 | return; | |
134 | } | |
135 | ||
136 | readdir->cookie = 0; | |
137 | memset(&readdir->verifier, 0, sizeof(readdir->verifier)); | |
138 | if (cookie == 2) | |
139 | return; | |
140 | ||
141 | /* | |
142 | * NFSv4 servers do not return entries for '.' and '..' | |
143 | * Therefore, we fake these entries here. We let '.' | |
144 | * have cookie 0 and '..' have cookie 1. Note that | |
145 | * when talking to the server, we always send cookie 0 | |
146 | * instead of 1 or 2. | |
147 | */ | |
148 | start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0); | |
149 | ||
150 | if (cookie == 0) { | |
151 | *p++ = xdr_one; /* next */ | |
152 | *p++ = xdr_zero; /* cookie, first word */ | |
153 | *p++ = xdr_one; /* cookie, second word */ | |
154 | *p++ = xdr_one; /* entry len */ | |
155 | memcpy(p, ".\0\0\0", 4); /* entry */ | |
156 | p++; | |
157 | *p++ = xdr_one; /* bitmap length */ | |
158 | *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ | |
159 | *p++ = htonl(8); /* attribute buffer length */ | |
160 | p = xdr_encode_hyper(p, dentry->d_inode->i_ino); | |
161 | } | |
162 | ||
163 | *p++ = xdr_one; /* next */ | |
164 | *p++ = xdr_zero; /* cookie, first word */ | |
165 | *p++ = xdr_two; /* cookie, second word */ | |
166 | *p++ = xdr_two; /* entry len */ | |
167 | memcpy(p, "..\0\0", 4); /* entry */ | |
168 | p++; | |
169 | *p++ = xdr_one; /* bitmap length */ | |
170 | *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ | |
171 | *p++ = htonl(8); /* attribute buffer length */ | |
172 | p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino); | |
173 | ||
174 | readdir->pgbase = (char *)p - (char *)start; | |
175 | readdir->count -= readdir->pgbase; | |
176 | kunmap_atomic(start, KM_USER0); | |
177 | } | |
178 | ||
179 | static void renew_lease(const struct nfs_server *server, unsigned long timestamp) | |
180 | { | |
181 | struct nfs4_client *clp = server->nfs4_state; | |
182 | spin_lock(&clp->cl_lock); | |
183 | if (time_before(clp->cl_last_renewal,timestamp)) | |
184 | clp->cl_last_renewal = timestamp; | |
185 | spin_unlock(&clp->cl_lock); | |
186 | } | |
187 | ||
188 | static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo) | |
189 | { | |
190 | struct nfs_inode *nfsi = NFS_I(inode); | |
191 | ||
192 | spin_lock(&inode->i_lock); | |
193 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR; | |
194 | if (cinfo->before == nfsi->change_attr && cinfo->atomic) | |
195 | nfsi->change_attr = cinfo->after; | |
196 | spin_unlock(&inode->i_lock); | |
197 | } | |
198 | ||
199 | struct nfs4_opendata { | |
200 | atomic_t count; | |
201 | struct nfs_openargs o_arg; | |
202 | struct nfs_openres o_res; | |
203 | struct nfs_open_confirmargs c_arg; | |
204 | struct nfs_open_confirmres c_res; | |
205 | struct nfs_fattr f_attr; | |
206 | struct nfs_fattr dir_attr; | |
207 | struct dentry *dentry; | |
208 | struct dentry *dir; | |
209 | struct nfs4_state_owner *owner; | |
210 | struct iattr attrs; | |
211 | unsigned long timestamp; | |
212 | int rpc_status; | |
213 | int cancelled; | |
214 | }; | |
215 | ||
216 | static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry, | |
217 | struct nfs4_state_owner *sp, int flags, | |
218 | const struct iattr *attrs) | |
219 | { | |
220 | struct dentry *parent = dget_parent(dentry); | |
221 | struct inode *dir = parent->d_inode; | |
222 | struct nfs_server *server = NFS_SERVER(dir); | |
223 | struct nfs4_opendata *p; | |
224 | ||
225 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
226 | if (p == NULL) | |
227 | goto err; | |
228 | p->o_arg.seqid = nfs_alloc_seqid(&sp->so_seqid); | |
229 | if (p->o_arg.seqid == NULL) | |
230 | goto err_free; | |
231 | atomic_set(&p->count, 1); | |
232 | p->dentry = dget(dentry); | |
233 | p->dir = parent; | |
234 | p->owner = sp; | |
235 | atomic_inc(&sp->so_count); | |
236 | p->o_arg.fh = NFS_FH(dir); | |
237 | p->o_arg.open_flags = flags, | |
238 | p->o_arg.clientid = server->nfs4_state->cl_clientid; | |
239 | p->o_arg.id = sp->so_id; | |
240 | p->o_arg.name = &dentry->d_name; | |
241 | p->o_arg.server = server; | |
242 | p->o_arg.bitmask = server->attr_bitmask; | |
243 | p->o_arg.claim = NFS4_OPEN_CLAIM_NULL; | |
244 | p->o_res.f_attr = &p->f_attr; | |
245 | p->o_res.dir_attr = &p->dir_attr; | |
246 | p->o_res.server = server; | |
247 | nfs_fattr_init(&p->f_attr); | |
248 | nfs_fattr_init(&p->dir_attr); | |
249 | if (flags & O_EXCL) { | |
250 | u32 *s = (u32 *) p->o_arg.u.verifier.data; | |
251 | s[0] = jiffies; | |
252 | s[1] = current->pid; | |
253 | } else if (flags & O_CREAT) { | |
254 | p->o_arg.u.attrs = &p->attrs; | |
255 | memcpy(&p->attrs, attrs, sizeof(p->attrs)); | |
256 | } | |
257 | p->c_arg.fh = &p->o_res.fh; | |
258 | p->c_arg.stateid = &p->o_res.stateid; | |
259 | p->c_arg.seqid = p->o_arg.seqid; | |
260 | return p; | |
261 | err_free: | |
262 | kfree(p); | |
263 | err: | |
264 | dput(parent); | |
265 | return NULL; | |
266 | } | |
267 | ||
268 | static void nfs4_opendata_free(struct nfs4_opendata *p) | |
269 | { | |
270 | if (p != NULL && atomic_dec_and_test(&p->count)) { | |
271 | nfs_free_seqid(p->o_arg.seqid); | |
272 | nfs4_put_state_owner(p->owner); | |
273 | dput(p->dir); | |
274 | dput(p->dentry); | |
275 | kfree(p); | |
276 | } | |
277 | } | |
278 | ||
279 | /* Helper for asynchronous RPC calls */ | |
280 | static int nfs4_call_async(struct rpc_clnt *clnt, | |
281 | const struct rpc_call_ops *tk_ops, void *calldata) | |
282 | { | |
283 | struct rpc_task *task; | |
284 | ||
285 | if (!(task = rpc_new_task(clnt, RPC_TASK_ASYNC, tk_ops, calldata))) | |
286 | return -ENOMEM; | |
287 | rpc_execute(task); | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static int nfs4_wait_for_completion_rpc_task(struct rpc_task *task) | |
292 | { | |
293 | sigset_t oldset; | |
294 | int ret; | |
295 | ||
296 | rpc_clnt_sigmask(task->tk_client, &oldset); | |
297 | ret = rpc_wait_for_completion_task(task); | |
298 | rpc_clnt_sigunmask(task->tk_client, &oldset); | |
299 | return ret; | |
300 | } | |
301 | ||
302 | static inline void update_open_stateflags(struct nfs4_state *state, mode_t open_flags) | |
303 | { | |
304 | switch (open_flags) { | |
305 | case FMODE_WRITE: | |
306 | state->n_wronly++; | |
307 | break; | |
308 | case FMODE_READ: | |
309 | state->n_rdonly++; | |
310 | break; | |
311 | case FMODE_READ|FMODE_WRITE: | |
312 | state->n_rdwr++; | |
313 | } | |
314 | } | |
315 | ||
316 | static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags) | |
317 | { | |
318 | struct inode *inode = state->inode; | |
319 | ||
320 | open_flags &= (FMODE_READ|FMODE_WRITE); | |
321 | /* Protect against nfs4_find_state_byowner() */ | |
322 | spin_lock(&state->owner->so_lock); | |
323 | spin_lock(&inode->i_lock); | |
324 | memcpy(&state->stateid, stateid, sizeof(state->stateid)); | |
325 | update_open_stateflags(state, open_flags); | |
326 | nfs4_state_set_mode_locked(state, state->state | open_flags); | |
327 | spin_unlock(&inode->i_lock); | |
328 | spin_unlock(&state->owner->so_lock); | |
329 | } | |
330 | ||
331 | static struct nfs4_state *nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data) | |
332 | { | |
333 | struct inode *inode; | |
334 | struct nfs4_state *state = NULL; | |
335 | ||
336 | if (!(data->f_attr.valid & NFS_ATTR_FATTR)) | |
337 | goto out; | |
338 | inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr); | |
339 | if (inode == NULL) | |
340 | goto out; | |
341 | state = nfs4_get_open_state(inode, data->owner); | |
342 | if (state == NULL) | |
343 | goto put_inode; | |
344 | update_open_stateid(state, &data->o_res.stateid, data->o_arg.open_flags); | |
345 | put_inode: | |
346 | iput(inode); | |
347 | out: | |
348 | return state; | |
349 | } | |
350 | ||
351 | static struct nfs_open_context *nfs4_state_find_open_context(struct nfs4_state *state) | |
352 | { | |
353 | struct nfs_inode *nfsi = NFS_I(state->inode); | |
354 | struct nfs_open_context *ctx; | |
355 | ||
356 | spin_lock(&state->inode->i_lock); | |
357 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
358 | if (ctx->state != state) | |
359 | continue; | |
360 | get_nfs_open_context(ctx); | |
361 | spin_unlock(&state->inode->i_lock); | |
362 | return ctx; | |
363 | } | |
364 | spin_unlock(&state->inode->i_lock); | |
365 | return ERR_PTR(-ENOENT); | |
366 | } | |
367 | ||
368 | static int nfs4_open_recover_helper(struct nfs4_opendata *opendata, mode_t openflags, nfs4_stateid *stateid) | |
369 | { | |
370 | int ret; | |
371 | ||
372 | opendata->o_arg.open_flags = openflags; | |
373 | ret = _nfs4_proc_open(opendata); | |
374 | if (ret != 0) | |
375 | return ret; | |
376 | memcpy(stateid->data, opendata->o_res.stateid.data, | |
377 | sizeof(stateid->data)); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state) | |
382 | { | |
383 | nfs4_stateid stateid; | |
384 | struct nfs4_state *newstate; | |
385 | int mode = 0; | |
386 | int delegation = 0; | |
387 | int ret; | |
388 | ||
389 | /* memory barrier prior to reading state->n_* */ | |
390 | smp_rmb(); | |
391 | if (state->n_rdwr != 0) { | |
392 | ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE, &stateid); | |
393 | if (ret != 0) | |
394 | return ret; | |
395 | mode |= FMODE_READ|FMODE_WRITE; | |
396 | if (opendata->o_res.delegation_type != 0) | |
397 | delegation = opendata->o_res.delegation_type; | |
398 | smp_rmb(); | |
399 | } | |
400 | if (state->n_wronly != 0) { | |
401 | ret = nfs4_open_recover_helper(opendata, FMODE_WRITE, &stateid); | |
402 | if (ret != 0) | |
403 | return ret; | |
404 | mode |= FMODE_WRITE; | |
405 | if (opendata->o_res.delegation_type != 0) | |
406 | delegation = opendata->o_res.delegation_type; | |
407 | smp_rmb(); | |
408 | } | |
409 | if (state->n_rdonly != 0) { | |
410 | ret = nfs4_open_recover_helper(opendata, FMODE_READ, &stateid); | |
411 | if (ret != 0) | |
412 | return ret; | |
413 | mode |= FMODE_READ; | |
414 | } | |
415 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
416 | if (mode == 0) | |
417 | return 0; | |
418 | if (opendata->o_res.delegation_type == 0) | |
419 | opendata->o_res.delegation_type = delegation; | |
420 | opendata->o_arg.open_flags |= mode; | |
421 | newstate = nfs4_opendata_to_nfs4_state(opendata); | |
422 | if (newstate != NULL) { | |
423 | if (opendata->o_res.delegation_type != 0) { | |
424 | struct nfs_inode *nfsi = NFS_I(newstate->inode); | |
425 | int delegation_flags = 0; | |
426 | if (nfsi->delegation) | |
427 | delegation_flags = nfsi->delegation->flags; | |
428 | if (!(delegation_flags & NFS_DELEGATION_NEED_RECLAIM)) | |
429 | nfs_inode_set_delegation(newstate->inode, | |
430 | opendata->owner->so_cred, | |
431 | &opendata->o_res); | |
432 | else | |
433 | nfs_inode_reclaim_delegation(newstate->inode, | |
434 | opendata->owner->so_cred, | |
435 | &opendata->o_res); | |
436 | } | |
437 | nfs4_close_state(newstate, opendata->o_arg.open_flags); | |
438 | } | |
439 | if (newstate != state) | |
440 | return -ESTALE; | |
441 | return 0; | |
442 | } | |
443 | ||
444 | /* | |
445 | * OPEN_RECLAIM: | |
446 | * reclaim state on the server after a reboot. | |
447 | */ | |
448 | static int _nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) | |
449 | { | |
450 | struct nfs_delegation *delegation = NFS_I(state->inode)->delegation; | |
451 | struct nfs4_opendata *opendata; | |
452 | int delegation_type = 0; | |
453 | int status; | |
454 | ||
455 | if (delegation != NULL) { | |
456 | if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) { | |
457 | memcpy(&state->stateid, &delegation->stateid, | |
458 | sizeof(state->stateid)); | |
459 | set_bit(NFS_DELEGATED_STATE, &state->flags); | |
460 | return 0; | |
461 | } | |
462 | delegation_type = delegation->type; | |
463 | } | |
464 | opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL); | |
465 | if (opendata == NULL) | |
466 | return -ENOMEM; | |
467 | opendata->o_arg.claim = NFS4_OPEN_CLAIM_PREVIOUS; | |
468 | opendata->o_arg.fh = NFS_FH(state->inode); | |
469 | nfs_copy_fh(&opendata->o_res.fh, opendata->o_arg.fh); | |
470 | opendata->o_arg.u.delegation_type = delegation_type; | |
471 | status = nfs4_open_recover(opendata, state); | |
472 | nfs4_opendata_free(opendata); | |
473 | return status; | |
474 | } | |
475 | ||
476 | static int nfs4_do_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) | |
477 | { | |
478 | struct nfs_server *server = NFS_SERVER(state->inode); | |
479 | struct nfs4_exception exception = { }; | |
480 | int err; | |
481 | do { | |
482 | err = _nfs4_do_open_reclaim(sp, state, dentry); | |
483 | if (err != -NFS4ERR_DELAY) | |
484 | break; | |
485 | nfs4_handle_exception(server, err, &exception); | |
486 | } while (exception.retry); | |
487 | return err; | |
488 | } | |
489 | ||
490 | static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) | |
491 | { | |
492 | struct nfs_open_context *ctx; | |
493 | int ret; | |
494 | ||
495 | ctx = nfs4_state_find_open_context(state); | |
496 | if (IS_ERR(ctx)) | |
497 | return PTR_ERR(ctx); | |
498 | ret = nfs4_do_open_reclaim(sp, state, ctx->dentry); | |
499 | put_nfs_open_context(ctx); | |
500 | return ret; | |
501 | } | |
502 | ||
503 | static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state) | |
504 | { | |
505 | struct nfs4_state_owner *sp = state->owner; | |
506 | struct nfs4_opendata *opendata; | |
507 | int ret; | |
508 | ||
509 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
510 | return 0; | |
511 | opendata = nfs4_opendata_alloc(dentry, sp, 0, NULL); | |
512 | if (opendata == NULL) | |
513 | return -ENOMEM; | |
514 | opendata->o_arg.claim = NFS4_OPEN_CLAIM_DELEGATE_CUR; | |
515 | memcpy(opendata->o_arg.u.delegation.data, state->stateid.data, | |
516 | sizeof(opendata->o_arg.u.delegation.data)); | |
517 | ret = nfs4_open_recover(opendata, state); | |
518 | nfs4_opendata_free(opendata); | |
519 | return ret; | |
520 | } | |
521 | ||
522 | int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state) | |
523 | { | |
524 | struct nfs4_exception exception = { }; | |
525 | struct nfs_server *server = NFS_SERVER(dentry->d_inode); | |
526 | int err; | |
527 | do { | |
528 | err = _nfs4_open_delegation_recall(dentry, state); | |
529 | switch (err) { | |
530 | case 0: | |
531 | return err; | |
532 | case -NFS4ERR_STALE_CLIENTID: | |
533 | case -NFS4ERR_STALE_STATEID: | |
534 | case -NFS4ERR_EXPIRED: | |
535 | /* Don't recall a delegation if it was lost */ | |
536 | nfs4_schedule_state_recovery(server->nfs4_state); | |
537 | return err; | |
538 | } | |
539 | err = nfs4_handle_exception(server, err, &exception); | |
540 | } while (exception.retry); | |
541 | return err; | |
542 | } | |
543 | ||
544 | static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata) | |
545 | { | |
546 | struct nfs4_opendata *data = calldata; | |
547 | struct rpc_message msg = { | |
548 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], | |
549 | .rpc_argp = &data->c_arg, | |
550 | .rpc_resp = &data->c_res, | |
551 | .rpc_cred = data->owner->so_cred, | |
552 | }; | |
553 | data->timestamp = jiffies; | |
554 | rpc_call_setup(task, &msg, 0); | |
555 | } | |
556 | ||
557 | static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata) | |
558 | { | |
559 | struct nfs4_opendata *data = calldata; | |
560 | ||
561 | data->rpc_status = task->tk_status; | |
562 | if (RPC_ASSASSINATED(task)) | |
563 | return; | |
564 | if (data->rpc_status == 0) { | |
565 | memcpy(data->o_res.stateid.data, data->c_res.stateid.data, | |
566 | sizeof(data->o_res.stateid.data)); | |
567 | renew_lease(data->o_res.server, data->timestamp); | |
568 | } | |
569 | nfs_increment_open_seqid(data->rpc_status, data->c_arg.seqid); | |
570 | nfs_confirm_seqid(&data->owner->so_seqid, data->rpc_status); | |
571 | } | |
572 | ||
573 | static void nfs4_open_confirm_release(void *calldata) | |
574 | { | |
575 | struct nfs4_opendata *data = calldata; | |
576 | struct nfs4_state *state = NULL; | |
577 | ||
578 | /* If this request hasn't been cancelled, do nothing */ | |
579 | if (data->cancelled == 0) | |
580 | goto out_free; | |
581 | /* In case of error, no cleanup! */ | |
582 | if (data->rpc_status != 0) | |
583 | goto out_free; | |
584 | nfs_confirm_seqid(&data->owner->so_seqid, 0); | |
585 | state = nfs4_opendata_to_nfs4_state(data); | |
586 | if (state != NULL) | |
587 | nfs4_close_state(state, data->o_arg.open_flags); | |
588 | out_free: | |
589 | nfs4_opendata_free(data); | |
590 | } | |
591 | ||
592 | static const struct rpc_call_ops nfs4_open_confirm_ops = { | |
593 | .rpc_call_prepare = nfs4_open_confirm_prepare, | |
594 | .rpc_call_done = nfs4_open_confirm_done, | |
595 | .rpc_release = nfs4_open_confirm_release, | |
596 | }; | |
597 | ||
598 | /* | |
599 | * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata | |
600 | */ | |
601 | static int _nfs4_proc_open_confirm(struct nfs4_opendata *data) | |
602 | { | |
603 | struct nfs_server *server = NFS_SERVER(data->dir->d_inode); | |
604 | struct rpc_task *task; | |
605 | int status; | |
606 | ||
607 | atomic_inc(&data->count); | |
608 | task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_confirm_ops, data); | |
609 | if (IS_ERR(task)) { | |
610 | nfs4_opendata_free(data); | |
611 | return PTR_ERR(task); | |
612 | } | |
613 | status = nfs4_wait_for_completion_rpc_task(task); | |
614 | if (status != 0) { | |
615 | data->cancelled = 1; | |
616 | smp_wmb(); | |
617 | } else | |
618 | status = data->rpc_status; | |
619 | rpc_release_task(task); | |
620 | return status; | |
621 | } | |
622 | ||
623 | static void nfs4_open_prepare(struct rpc_task *task, void *calldata) | |
624 | { | |
625 | struct nfs4_opendata *data = calldata; | |
626 | struct nfs4_state_owner *sp = data->owner; | |
627 | struct rpc_message msg = { | |
628 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], | |
629 | .rpc_argp = &data->o_arg, | |
630 | .rpc_resp = &data->o_res, | |
631 | .rpc_cred = sp->so_cred, | |
632 | }; | |
633 | ||
634 | if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0) | |
635 | return; | |
636 | /* Update sequence id. */ | |
637 | data->o_arg.id = sp->so_id; | |
638 | data->o_arg.clientid = sp->so_client->cl_clientid; | |
639 | if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS) | |
640 | msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR]; | |
641 | data->timestamp = jiffies; | |
642 | rpc_call_setup(task, &msg, 0); | |
643 | } | |
644 | ||
645 | static void nfs4_open_done(struct rpc_task *task, void *calldata) | |
646 | { | |
647 | struct nfs4_opendata *data = calldata; | |
648 | ||
649 | data->rpc_status = task->tk_status; | |
650 | if (RPC_ASSASSINATED(task)) | |
651 | return; | |
652 | if (task->tk_status == 0) { | |
653 | switch (data->o_res.f_attr->mode & S_IFMT) { | |
654 | case S_IFREG: | |
655 | break; | |
656 | case S_IFLNK: | |
657 | data->rpc_status = -ELOOP; | |
658 | break; | |
659 | case S_IFDIR: | |
660 | data->rpc_status = -EISDIR; | |
661 | break; | |
662 | default: | |
663 | data->rpc_status = -ENOTDIR; | |
664 | } | |
665 | renew_lease(data->o_res.server, data->timestamp); | |
666 | } | |
667 | nfs_increment_open_seqid(data->rpc_status, data->o_arg.seqid); | |
668 | } | |
669 | ||
670 | static void nfs4_open_release(void *calldata) | |
671 | { | |
672 | struct nfs4_opendata *data = calldata; | |
673 | struct nfs4_state *state = NULL; | |
674 | ||
675 | /* If this request hasn't been cancelled, do nothing */ | |
676 | if (data->cancelled == 0) | |
677 | goto out_free; | |
678 | /* In case of error, no cleanup! */ | |
679 | if (data->rpc_status != 0) | |
680 | goto out_free; | |
681 | /* In case we need an open_confirm, no cleanup! */ | |
682 | if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM) | |
683 | goto out_free; | |
684 | nfs_confirm_seqid(&data->owner->so_seqid, 0); | |
685 | state = nfs4_opendata_to_nfs4_state(data); | |
686 | if (state != NULL) | |
687 | nfs4_close_state(state, data->o_arg.open_flags); | |
688 | out_free: | |
689 | nfs4_opendata_free(data); | |
690 | } | |
691 | ||
692 | static const struct rpc_call_ops nfs4_open_ops = { | |
693 | .rpc_call_prepare = nfs4_open_prepare, | |
694 | .rpc_call_done = nfs4_open_done, | |
695 | .rpc_release = nfs4_open_release, | |
696 | }; | |
697 | ||
698 | /* | |
699 | * Note: On error, nfs4_proc_open will free the struct nfs4_opendata | |
700 | */ | |
701 | static int _nfs4_proc_open(struct nfs4_opendata *data) | |
702 | { | |
703 | struct inode *dir = data->dir->d_inode; | |
704 | struct nfs_server *server = NFS_SERVER(dir); | |
705 | struct nfs_openargs *o_arg = &data->o_arg; | |
706 | struct nfs_openres *o_res = &data->o_res; | |
707 | struct rpc_task *task; | |
708 | int status; | |
709 | ||
710 | atomic_inc(&data->count); | |
711 | task = rpc_run_task(server->client, RPC_TASK_ASYNC, &nfs4_open_ops, data); | |
712 | if (IS_ERR(task)) { | |
713 | nfs4_opendata_free(data); | |
714 | return PTR_ERR(task); | |
715 | } | |
716 | status = nfs4_wait_for_completion_rpc_task(task); | |
717 | if (status != 0) { | |
718 | data->cancelled = 1; | |
719 | smp_wmb(); | |
720 | } else | |
721 | status = data->rpc_status; | |
722 | rpc_release_task(task); | |
723 | if (status != 0) | |
724 | return status; | |
725 | ||
726 | if (o_arg->open_flags & O_CREAT) { | |
727 | update_changeattr(dir, &o_res->cinfo); | |
728 | nfs_post_op_update_inode(dir, o_res->dir_attr); | |
729 | } else | |
730 | nfs_refresh_inode(dir, o_res->dir_attr); | |
731 | if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { | |
732 | status = _nfs4_proc_open_confirm(data); | |
733 | if (status != 0) | |
734 | return status; | |
735 | } | |
736 | nfs_confirm_seqid(&data->owner->so_seqid, 0); | |
737 | if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) | |
738 | return server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr); | |
739 | return 0; | |
740 | } | |
741 | ||
742 | static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags) | |
743 | { | |
744 | struct nfs_access_entry cache; | |
745 | int mask = 0; | |
746 | int status; | |
747 | ||
748 | if (openflags & FMODE_READ) | |
749 | mask |= MAY_READ; | |
750 | if (openflags & FMODE_WRITE) | |
751 | mask |= MAY_WRITE; | |
752 | status = nfs_access_get_cached(inode, cred, &cache); | |
753 | if (status == 0) | |
754 | goto out; | |
755 | ||
756 | /* Be clever: ask server to check for all possible rights */ | |
757 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
758 | cache.cred = cred; | |
759 | cache.jiffies = jiffies; | |
760 | status = _nfs4_proc_access(inode, &cache); | |
761 | if (status != 0) | |
762 | return status; | |
763 | nfs_access_add_cache(inode, &cache); | |
764 | out: | |
765 | if ((cache.mask & mask) == mask) | |
766 | return 0; | |
767 | return -EACCES; | |
768 | } | |
769 | ||
770 | int nfs4_recover_expired_lease(struct nfs_server *server) | |
771 | { | |
772 | struct nfs4_client *clp = server->nfs4_state; | |
773 | ||
774 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) | |
775 | nfs4_schedule_state_recovery(clp); | |
776 | return nfs4_wait_clnt_recover(server->client, clp); | |
777 | } | |
778 | ||
779 | /* | |
780 | * OPEN_EXPIRED: | |
781 | * reclaim state on the server after a network partition. | |
782 | * Assumes caller holds the appropriate lock | |
783 | */ | |
784 | static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) | |
785 | { | |
786 | struct inode *inode = state->inode; | |
787 | struct nfs_delegation *delegation = NFS_I(inode)->delegation; | |
788 | struct nfs4_opendata *opendata; | |
789 | int openflags = state->state & (FMODE_READ|FMODE_WRITE); | |
790 | int ret; | |
791 | ||
792 | if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) { | |
793 | ret = _nfs4_do_access(inode, sp->so_cred, openflags); | |
794 | if (ret < 0) | |
795 | return ret; | |
796 | memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid)); | |
797 | set_bit(NFS_DELEGATED_STATE, &state->flags); | |
798 | return 0; | |
799 | } | |
800 | opendata = nfs4_opendata_alloc(dentry, sp, openflags, NULL); | |
801 | if (opendata == NULL) | |
802 | return -ENOMEM; | |
803 | ret = nfs4_open_recover(opendata, state); | |
804 | if (ret == -ESTALE) { | |
805 | /* Invalidate the state owner so we don't ever use it again */ | |
806 | nfs4_drop_state_owner(sp); | |
807 | d_drop(dentry); | |
808 | } | |
809 | nfs4_opendata_free(opendata); | |
810 | return ret; | |
811 | } | |
812 | ||
813 | static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) | |
814 | { | |
815 | struct nfs_server *server = NFS_SERVER(dentry->d_inode); | |
816 | struct nfs4_exception exception = { }; | |
817 | int err; | |
818 | ||
819 | do { | |
820 | err = _nfs4_open_expired(sp, state, dentry); | |
821 | if (err == -NFS4ERR_DELAY) | |
822 | nfs4_handle_exception(server, err, &exception); | |
823 | } while (exception.retry); | |
824 | return err; | |
825 | } | |
826 | ||
827 | static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) | |
828 | { | |
829 | struct nfs_open_context *ctx; | |
830 | int ret; | |
831 | ||
832 | ctx = nfs4_state_find_open_context(state); | |
833 | if (IS_ERR(ctx)) | |
834 | return PTR_ERR(ctx); | |
835 | ret = nfs4_do_open_expired(sp, state, ctx->dentry); | |
836 | put_nfs_open_context(ctx); | |
837 | return ret; | |
838 | } | |
839 | ||
840 | /* | |
841 | * Returns a referenced nfs4_state if there is an open delegation on the file | |
842 | */ | |
843 | static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res) | |
844 | { | |
845 | struct nfs_delegation *delegation; | |
846 | struct nfs_server *server = NFS_SERVER(inode); | |
847 | struct nfs4_client *clp = server->nfs4_state; | |
848 | struct nfs_inode *nfsi = NFS_I(inode); | |
849 | struct nfs4_state_owner *sp = NULL; | |
850 | struct nfs4_state *state = NULL; | |
851 | int open_flags = flags & (FMODE_READ|FMODE_WRITE); | |
852 | int err; | |
853 | ||
854 | err = -ENOMEM; | |
855 | if (!(sp = nfs4_get_state_owner(server, cred))) { | |
856 | dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__); | |
857 | return err; | |
858 | } | |
859 | err = nfs4_recover_expired_lease(server); | |
860 | if (err != 0) | |
861 | goto out_put_state_owner; | |
862 | /* Protect against reboot recovery - NOTE ORDER! */ | |
863 | down_read(&clp->cl_sem); | |
864 | /* Protect against delegation recall */ | |
865 | down_read(&nfsi->rwsem); | |
866 | delegation = NFS_I(inode)->delegation; | |
867 | err = -ENOENT; | |
868 | if (delegation == NULL || (delegation->type & open_flags) != open_flags) | |
869 | goto out_err; | |
870 | err = -ENOMEM; | |
871 | state = nfs4_get_open_state(inode, sp); | |
872 | if (state == NULL) | |
873 | goto out_err; | |
874 | ||
875 | err = -ENOENT; | |
876 | if ((state->state & open_flags) == open_flags) { | |
877 | spin_lock(&inode->i_lock); | |
878 | update_open_stateflags(state, open_flags); | |
879 | spin_unlock(&inode->i_lock); | |
880 | goto out_ok; | |
881 | } else if (state->state != 0) | |
882 | goto out_put_open_state; | |
883 | ||
884 | lock_kernel(); | |
885 | err = _nfs4_do_access(inode, cred, open_flags); | |
886 | unlock_kernel(); | |
887 | if (err != 0) | |
888 | goto out_put_open_state; | |
889 | set_bit(NFS_DELEGATED_STATE, &state->flags); | |
890 | update_open_stateid(state, &delegation->stateid, open_flags); | |
891 | out_ok: | |
892 | nfs4_put_state_owner(sp); | |
893 | up_read(&nfsi->rwsem); | |
894 | up_read(&clp->cl_sem); | |
895 | *res = state; | |
896 | return 0; | |
897 | out_put_open_state: | |
898 | nfs4_put_open_state(state); | |
899 | out_err: | |
900 | up_read(&nfsi->rwsem); | |
901 | up_read(&clp->cl_sem); | |
902 | if (err != -EACCES) | |
903 | nfs_inode_return_delegation(inode); | |
904 | out_put_state_owner: | |
905 | nfs4_put_state_owner(sp); | |
906 | return err; | |
907 | } | |
908 | ||
909 | static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred) | |
910 | { | |
911 | struct nfs4_exception exception = { }; | |
912 | struct nfs4_state *res = ERR_PTR(-EIO); | |
913 | int err; | |
914 | ||
915 | do { | |
916 | err = _nfs4_open_delegated(inode, flags, cred, &res); | |
917 | if (err == 0) | |
918 | break; | |
919 | res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode), | |
920 | err, &exception)); | |
921 | } while (exception.retry); | |
922 | return res; | |
923 | } | |
924 | ||
925 | /* | |
926 | * Returns a referenced nfs4_state | |
927 | */ | |
928 | static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res) | |
929 | { | |
930 | struct nfs4_state_owner *sp; | |
931 | struct nfs4_state *state = NULL; | |
932 | struct nfs_server *server = NFS_SERVER(dir); | |
933 | struct nfs4_client *clp = server->nfs4_state; | |
934 | struct nfs4_opendata *opendata; | |
935 | int status; | |
936 | ||
937 | /* Protect against reboot recovery conflicts */ | |
938 | status = -ENOMEM; | |
939 | if (!(sp = nfs4_get_state_owner(server, cred))) { | |
940 | dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); | |
941 | goto out_err; | |
942 | } | |
943 | status = nfs4_recover_expired_lease(server); | |
944 | if (status != 0) | |
945 | goto err_put_state_owner; | |
946 | down_read(&clp->cl_sem); | |
947 | status = -ENOMEM; | |
948 | opendata = nfs4_opendata_alloc(dentry, sp, flags, sattr); | |
949 | if (opendata == NULL) | |
950 | goto err_put_state_owner; | |
951 | ||
952 | status = _nfs4_proc_open(opendata); | |
953 | if (status != 0) | |
954 | goto err_opendata_free; | |
955 | ||
956 | status = -ENOMEM; | |
957 | state = nfs4_opendata_to_nfs4_state(opendata); | |
958 | if (state == NULL) | |
959 | goto err_opendata_free; | |
960 | if (opendata->o_res.delegation_type != 0) | |
961 | nfs_inode_set_delegation(state->inode, cred, &opendata->o_res); | |
962 | nfs4_opendata_free(opendata); | |
963 | nfs4_put_state_owner(sp); | |
964 | up_read(&clp->cl_sem); | |
965 | *res = state; | |
966 | return 0; | |
967 | err_opendata_free: | |
968 | nfs4_opendata_free(opendata); | |
969 | err_put_state_owner: | |
970 | nfs4_put_state_owner(sp); | |
971 | out_err: | |
972 | /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */ | |
973 | up_read(&clp->cl_sem); | |
974 | *res = NULL; | |
975 | return status; | |
976 | } | |
977 | ||
978 | ||
979 | static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred) | |
980 | { | |
981 | struct nfs4_exception exception = { }; | |
982 | struct nfs4_state *res; | |
983 | int status; | |
984 | ||
985 | do { | |
986 | status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res); | |
987 | if (status == 0) | |
988 | break; | |
989 | /* NOTE: BAD_SEQID means the server and client disagree about the | |
990 | * book-keeping w.r.t. state-changing operations | |
991 | * (OPEN/CLOSE/LOCK/LOCKU...) | |
992 | * It is actually a sign of a bug on the client or on the server. | |
993 | * | |
994 | * If we receive a BAD_SEQID error in the particular case of | |
995 | * doing an OPEN, we assume that nfs_increment_open_seqid() will | |
996 | * have unhashed the old state_owner for us, and that we can | |
997 | * therefore safely retry using a new one. We should still warn | |
998 | * the user though... | |
999 | */ | |
1000 | if (status == -NFS4ERR_BAD_SEQID) { | |
1001 | printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n"); | |
1002 | exception.retry = 1; | |
1003 | continue; | |
1004 | } | |
1005 | /* | |
1006 | * BAD_STATEID on OPEN means that the server cancelled our | |
1007 | * state before it received the OPEN_CONFIRM. | |
1008 | * Recover by retrying the request as per the discussion | |
1009 | * on Page 181 of RFC3530. | |
1010 | */ | |
1011 | if (status == -NFS4ERR_BAD_STATEID) { | |
1012 | exception.retry = 1; | |
1013 | continue; | |
1014 | } | |
1015 | res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir), | |
1016 | status, &exception)); | |
1017 | } while (exception.retry); | |
1018 | return res; | |
1019 | } | |
1020 | ||
1021 | static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr, | |
1022 | struct nfs_fh *fhandle, struct iattr *sattr, | |
1023 | struct nfs4_state *state) | |
1024 | { | |
1025 | struct nfs_setattrargs arg = { | |
1026 | .fh = fhandle, | |
1027 | .iap = sattr, | |
1028 | .server = server, | |
1029 | .bitmask = server->attr_bitmask, | |
1030 | }; | |
1031 | struct nfs_setattrres res = { | |
1032 | .fattr = fattr, | |
1033 | .server = server, | |
1034 | }; | |
1035 | struct rpc_message msg = { | |
1036 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], | |
1037 | .rpc_argp = &arg, | |
1038 | .rpc_resp = &res, | |
1039 | }; | |
1040 | unsigned long timestamp = jiffies; | |
1041 | int status; | |
1042 | ||
1043 | nfs_fattr_init(fattr); | |
1044 | ||
1045 | if (state != NULL) { | |
1046 | msg.rpc_cred = state->owner->so_cred; | |
1047 | nfs4_copy_stateid(&arg.stateid, state, current->files); | |
1048 | } else | |
1049 | memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid)); | |
1050 | ||
1051 | status = rpc_call_sync(server->client, &msg, 0); | |
1052 | if (status == 0 && state != NULL) | |
1053 | renew_lease(server, timestamp); | |
1054 | return status; | |
1055 | } | |
1056 | ||
1057 | static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr, | |
1058 | struct nfs_fh *fhandle, struct iattr *sattr, | |
1059 | struct nfs4_state *state) | |
1060 | { | |
1061 | struct nfs4_exception exception = { }; | |
1062 | int err; | |
1063 | do { | |
1064 | err = nfs4_handle_exception(server, | |
1065 | _nfs4_do_setattr(server, fattr, fhandle, sattr, | |
1066 | state), | |
1067 | &exception); | |
1068 | } while (exception.retry); | |
1069 | return err; | |
1070 | } | |
1071 | ||
1072 | struct nfs4_closedata { | |
1073 | struct inode *inode; | |
1074 | struct nfs4_state *state; | |
1075 | struct nfs_closeargs arg; | |
1076 | struct nfs_closeres res; | |
1077 | struct nfs_fattr fattr; | |
1078 | unsigned long timestamp; | |
1079 | }; | |
1080 | ||
1081 | static void nfs4_free_closedata(void *data) | |
1082 | { | |
1083 | struct nfs4_closedata *calldata = data; | |
1084 | struct nfs4_state_owner *sp = calldata->state->owner; | |
1085 | ||
1086 | nfs4_put_open_state(calldata->state); | |
1087 | nfs_free_seqid(calldata->arg.seqid); | |
1088 | nfs4_put_state_owner(sp); | |
1089 | kfree(calldata); | |
1090 | } | |
1091 | ||
1092 | static void nfs4_close_done(struct rpc_task *task, void *data) | |
1093 | { | |
1094 | struct nfs4_closedata *calldata = data; | |
1095 | struct nfs4_state *state = calldata->state; | |
1096 | struct nfs_server *server = NFS_SERVER(calldata->inode); | |
1097 | ||
1098 | if (RPC_ASSASSINATED(task)) | |
1099 | return; | |
1100 | /* hmm. we are done with the inode, and in the process of freeing | |
1101 | * the state_owner. we keep this around to process errors | |
1102 | */ | |
1103 | nfs_increment_open_seqid(task->tk_status, calldata->arg.seqid); | |
1104 | switch (task->tk_status) { | |
1105 | case 0: | |
1106 | memcpy(&state->stateid, &calldata->res.stateid, | |
1107 | sizeof(state->stateid)); | |
1108 | renew_lease(server, calldata->timestamp); | |
1109 | break; | |
1110 | case -NFS4ERR_STALE_STATEID: | |
1111 | case -NFS4ERR_EXPIRED: | |
1112 | nfs4_schedule_state_recovery(server->nfs4_state); | |
1113 | break; | |
1114 | default: | |
1115 | if (nfs4_async_handle_error(task, server) == -EAGAIN) { | |
1116 | rpc_restart_call(task); | |
1117 | return; | |
1118 | } | |
1119 | } | |
1120 | nfs_refresh_inode(calldata->inode, calldata->res.fattr); | |
1121 | } | |
1122 | ||
1123 | static void nfs4_close_prepare(struct rpc_task *task, void *data) | |
1124 | { | |
1125 | struct nfs4_closedata *calldata = data; | |
1126 | struct nfs4_state *state = calldata->state; | |
1127 | struct rpc_message msg = { | |
1128 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], | |
1129 | .rpc_argp = &calldata->arg, | |
1130 | .rpc_resp = &calldata->res, | |
1131 | .rpc_cred = state->owner->so_cred, | |
1132 | }; | |
1133 | int mode = 0, old_mode; | |
1134 | ||
1135 | if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) | |
1136 | return; | |
1137 | /* Recalculate the new open mode in case someone reopened the file | |
1138 | * while we were waiting in line to be scheduled. | |
1139 | */ | |
1140 | spin_lock(&state->owner->so_lock); | |
1141 | spin_lock(&calldata->inode->i_lock); | |
1142 | mode = old_mode = state->state; | |
1143 | if (state->n_rdwr == 0) { | |
1144 | if (state->n_rdonly == 0) | |
1145 | mode &= ~FMODE_READ; | |
1146 | if (state->n_wronly == 0) | |
1147 | mode &= ~FMODE_WRITE; | |
1148 | } | |
1149 | nfs4_state_set_mode_locked(state, mode); | |
1150 | spin_unlock(&calldata->inode->i_lock); | |
1151 | spin_unlock(&state->owner->so_lock); | |
1152 | if (mode == old_mode || test_bit(NFS_DELEGATED_STATE, &state->flags)) { | |
1153 | /* Note: exit _without_ calling nfs4_close_done */ | |
1154 | task->tk_action = NULL; | |
1155 | return; | |
1156 | } | |
1157 | nfs_fattr_init(calldata->res.fattr); | |
1158 | if (mode != 0) | |
1159 | msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; | |
1160 | calldata->arg.open_flags = mode; | |
1161 | calldata->timestamp = jiffies; | |
1162 | rpc_call_setup(task, &msg, 0); | |
1163 | } | |
1164 | ||
1165 | static const struct rpc_call_ops nfs4_close_ops = { | |
1166 | .rpc_call_prepare = nfs4_close_prepare, | |
1167 | .rpc_call_done = nfs4_close_done, | |
1168 | .rpc_release = nfs4_free_closedata, | |
1169 | }; | |
1170 | ||
1171 | /* | |
1172 | * It is possible for data to be read/written from a mem-mapped file | |
1173 | * after the sys_close call (which hits the vfs layer as a flush). | |
1174 | * This means that we can't safely call nfsv4 close on a file until | |
1175 | * the inode is cleared. This in turn means that we are not good | |
1176 | * NFSv4 citizens - we do not indicate to the server to update the file's | |
1177 | * share state even when we are done with one of the three share | |
1178 | * stateid's in the inode. | |
1179 | * | |
1180 | * NOTE: Caller must be holding the sp->so_owner semaphore! | |
1181 | */ | |
1182 | int nfs4_do_close(struct inode *inode, struct nfs4_state *state) | |
1183 | { | |
1184 | struct nfs_server *server = NFS_SERVER(inode); | |
1185 | struct nfs4_closedata *calldata; | |
1186 | int status = -ENOMEM; | |
1187 | ||
1188 | calldata = kmalloc(sizeof(*calldata), GFP_KERNEL); | |
1189 | if (calldata == NULL) | |
1190 | goto out; | |
1191 | calldata->inode = inode; | |
1192 | calldata->state = state; | |
1193 | calldata->arg.fh = NFS_FH(inode); | |
1194 | calldata->arg.stateid = &state->stateid; | |
1195 | /* Serialization for the sequence id */ | |
1196 | calldata->arg.seqid = nfs_alloc_seqid(&state->owner->so_seqid); | |
1197 | if (calldata->arg.seqid == NULL) | |
1198 | goto out_free_calldata; | |
1199 | calldata->arg.bitmask = server->attr_bitmask; | |
1200 | calldata->res.fattr = &calldata->fattr; | |
1201 | calldata->res.server = server; | |
1202 | ||
1203 | status = nfs4_call_async(server->client, &nfs4_close_ops, calldata); | |
1204 | if (status == 0) | |
1205 | goto out; | |
1206 | ||
1207 | nfs_free_seqid(calldata->arg.seqid); | |
1208 | out_free_calldata: | |
1209 | kfree(calldata); | |
1210 | out: | |
1211 | return status; | |
1212 | } | |
1213 | ||
1214 | static void nfs4_intent_set_file(struct nameidata *nd, struct dentry *dentry, struct nfs4_state *state) | |
1215 | { | |
1216 | struct file *filp; | |
1217 | ||
1218 | filp = lookup_instantiate_filp(nd, dentry, NULL); | |
1219 | if (!IS_ERR(filp)) { | |
1220 | struct nfs_open_context *ctx; | |
1221 | ctx = (struct nfs_open_context *)filp->private_data; | |
1222 | ctx->state = state; | |
1223 | } else | |
1224 | nfs4_close_state(state, nd->intent.open.flags); | |
1225 | } | |
1226 | ||
1227 | struct dentry * | |
1228 | nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
1229 | { | |
1230 | struct iattr attr; | |
1231 | struct rpc_cred *cred; | |
1232 | struct nfs4_state *state; | |
1233 | struct dentry *res; | |
1234 | ||
1235 | if (nd->flags & LOOKUP_CREATE) { | |
1236 | attr.ia_mode = nd->intent.open.create_mode; | |
1237 | attr.ia_valid = ATTR_MODE; | |
1238 | if (!IS_POSIXACL(dir)) | |
1239 | attr.ia_mode &= ~current->fs->umask; | |
1240 | } else { | |
1241 | attr.ia_valid = 0; | |
1242 | BUG_ON(nd->intent.open.flags & O_CREAT); | |
1243 | } | |
1244 | ||
1245 | cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0); | |
1246 | if (IS_ERR(cred)) | |
1247 | return (struct dentry *)cred; | |
1248 | state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred); | |
1249 | put_rpccred(cred); | |
1250 | if (IS_ERR(state)) { | |
1251 | if (PTR_ERR(state) == -ENOENT) | |
1252 | d_add(dentry, NULL); | |
1253 | return (struct dentry *)state; | |
1254 | } | |
1255 | res = d_add_unique(dentry, igrab(state->inode)); | |
1256 | if (res != NULL) | |
1257 | dentry = res; | |
1258 | nfs4_intent_set_file(nd, dentry, state); | |
1259 | return res; | |
1260 | } | |
1261 | ||
1262 | int | |
1263 | nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags, struct nameidata *nd) | |
1264 | { | |
1265 | struct rpc_cred *cred; | |
1266 | struct nfs4_state *state; | |
1267 | ||
1268 | cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0); | |
1269 | if (IS_ERR(cred)) | |
1270 | return PTR_ERR(cred); | |
1271 | state = nfs4_open_delegated(dentry->d_inode, openflags, cred); | |
1272 | if (IS_ERR(state)) | |
1273 | state = nfs4_do_open(dir, dentry, openflags, NULL, cred); | |
1274 | put_rpccred(cred); | |
1275 | if (IS_ERR(state)) { | |
1276 | switch (PTR_ERR(state)) { | |
1277 | case -EPERM: | |
1278 | case -EACCES: | |
1279 | case -EDQUOT: | |
1280 | case -ENOSPC: | |
1281 | case -EROFS: | |
1282 | lookup_instantiate_filp(nd, (struct dentry *)state, NULL); | |
1283 | return 1; | |
1284 | case -ENOENT: | |
1285 | if (dentry->d_inode == NULL) | |
1286 | return 1; | |
1287 | } | |
1288 | goto out_drop; | |
1289 | } | |
1290 | if (state->inode == dentry->d_inode) { | |
1291 | nfs4_intent_set_file(nd, dentry, state); | |
1292 | return 1; | |
1293 | } | |
1294 | nfs4_close_state(state, openflags); | |
1295 | out_drop: | |
1296 | d_drop(dentry); | |
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | ||
1301 | static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) | |
1302 | { | |
1303 | struct nfs4_server_caps_res res = {}; | |
1304 | struct rpc_message msg = { | |
1305 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], | |
1306 | .rpc_argp = fhandle, | |
1307 | .rpc_resp = &res, | |
1308 | }; | |
1309 | int status; | |
1310 | ||
1311 | status = rpc_call_sync(server->client, &msg, 0); | |
1312 | if (status == 0) { | |
1313 | memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); | |
1314 | if (res.attr_bitmask[0] & FATTR4_WORD0_ACL) | |
1315 | server->caps |= NFS_CAP_ACLS; | |
1316 | if (res.has_links != 0) | |
1317 | server->caps |= NFS_CAP_HARDLINKS; | |
1318 | if (res.has_symlinks != 0) | |
1319 | server->caps |= NFS_CAP_SYMLINKS; | |
1320 | server->acl_bitmask = res.acl_bitmask; | |
1321 | } | |
1322 | return status; | |
1323 | } | |
1324 | ||
1325 | static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) | |
1326 | { | |
1327 | struct nfs4_exception exception = { }; | |
1328 | int err; | |
1329 | do { | |
1330 | err = nfs4_handle_exception(server, | |
1331 | _nfs4_server_capabilities(server, fhandle), | |
1332 | &exception); | |
1333 | } while (exception.retry); | |
1334 | return err; | |
1335 | } | |
1336 | ||
1337 | static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, | |
1338 | struct nfs_fsinfo *info) | |
1339 | { | |
1340 | struct nfs4_lookup_root_arg args = { | |
1341 | .bitmask = nfs4_fattr_bitmap, | |
1342 | }; | |
1343 | struct nfs4_lookup_res res = { | |
1344 | .server = server, | |
1345 | .fattr = info->fattr, | |
1346 | .fh = fhandle, | |
1347 | }; | |
1348 | struct rpc_message msg = { | |
1349 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], | |
1350 | .rpc_argp = &args, | |
1351 | .rpc_resp = &res, | |
1352 | }; | |
1353 | nfs_fattr_init(info->fattr); | |
1354 | return rpc_call_sync(server->client, &msg, 0); | |
1355 | } | |
1356 | ||
1357 | static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, | |
1358 | struct nfs_fsinfo *info) | |
1359 | { | |
1360 | struct nfs4_exception exception = { }; | |
1361 | int err; | |
1362 | do { | |
1363 | err = nfs4_handle_exception(server, | |
1364 | _nfs4_lookup_root(server, fhandle, info), | |
1365 | &exception); | |
1366 | } while (exception.retry); | |
1367 | return err; | |
1368 | } | |
1369 | ||
1370 | static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, | |
1371 | struct nfs_fsinfo *info) | |
1372 | { | |
1373 | struct nfs_fattr * fattr = info->fattr; | |
1374 | unsigned char * p; | |
1375 | struct qstr q; | |
1376 | struct nfs4_lookup_arg args = { | |
1377 | .dir_fh = fhandle, | |
1378 | .name = &q, | |
1379 | .bitmask = nfs4_fattr_bitmap, | |
1380 | }; | |
1381 | struct nfs4_lookup_res res = { | |
1382 | .server = server, | |
1383 | .fattr = fattr, | |
1384 | .fh = fhandle, | |
1385 | }; | |
1386 | struct rpc_message msg = { | |
1387 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], | |
1388 | .rpc_argp = &args, | |
1389 | .rpc_resp = &res, | |
1390 | }; | |
1391 | int status; | |
1392 | ||
1393 | /* | |
1394 | * Now we do a separate LOOKUP for each component of the mount path. | |
1395 | * The LOOKUPs are done separately so that we can conveniently | |
1396 | * catch an ERR_WRONGSEC if it occurs along the way... | |
1397 | */ | |
1398 | status = nfs4_lookup_root(server, fhandle, info); | |
1399 | if (status) | |
1400 | goto out; | |
1401 | ||
1402 | p = server->mnt_path; | |
1403 | for (;;) { | |
1404 | struct nfs4_exception exception = { }; | |
1405 | ||
1406 | while (*p == '/') | |
1407 | p++; | |
1408 | if (!*p) | |
1409 | break; | |
1410 | q.name = p; | |
1411 | while (*p && (*p != '/')) | |
1412 | p++; | |
1413 | q.len = p - q.name; | |
1414 | ||
1415 | do { | |
1416 | nfs_fattr_init(fattr); | |
1417 | status = nfs4_handle_exception(server, | |
1418 | rpc_call_sync(server->client, &msg, 0), | |
1419 | &exception); | |
1420 | } while (exception.retry); | |
1421 | if (status == 0) | |
1422 | continue; | |
1423 | if (status == -ENOENT) { | |
1424 | printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path); | |
1425 | printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n"); | |
1426 | } | |
1427 | break; | |
1428 | } | |
1429 | if (status == 0) | |
1430 | status = nfs4_server_capabilities(server, fhandle); | |
1431 | if (status == 0) | |
1432 | status = nfs4_do_fsinfo(server, fhandle, info); | |
1433 | out: | |
1434 | return nfs4_map_errors(status); | |
1435 | } | |
1436 | ||
1437 | static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) | |
1438 | { | |
1439 | struct nfs4_getattr_arg args = { | |
1440 | .fh = fhandle, | |
1441 | .bitmask = server->attr_bitmask, | |
1442 | }; | |
1443 | struct nfs4_getattr_res res = { | |
1444 | .fattr = fattr, | |
1445 | .server = server, | |
1446 | }; | |
1447 | struct rpc_message msg = { | |
1448 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], | |
1449 | .rpc_argp = &args, | |
1450 | .rpc_resp = &res, | |
1451 | }; | |
1452 | ||
1453 | nfs_fattr_init(fattr); | |
1454 | return rpc_call_sync(server->client, &msg, 0); | |
1455 | } | |
1456 | ||
1457 | static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) | |
1458 | { | |
1459 | struct nfs4_exception exception = { }; | |
1460 | int err; | |
1461 | do { | |
1462 | err = nfs4_handle_exception(server, | |
1463 | _nfs4_proc_getattr(server, fhandle, fattr), | |
1464 | &exception); | |
1465 | } while (exception.retry); | |
1466 | return err; | |
1467 | } | |
1468 | ||
1469 | /* | |
1470 | * The file is not closed if it is opened due to the a request to change | |
1471 | * the size of the file. The open call will not be needed once the | |
1472 | * VFS layer lookup-intents are implemented. | |
1473 | * | |
1474 | * Close is called when the inode is destroyed. | |
1475 | * If we haven't opened the file for O_WRONLY, we | |
1476 | * need to in the size_change case to obtain a stateid. | |
1477 | * | |
1478 | * Got race? | |
1479 | * Because OPEN is always done by name in nfsv4, it is | |
1480 | * possible that we opened a different file by the same | |
1481 | * name. We can recognize this race condition, but we | |
1482 | * can't do anything about it besides returning an error. | |
1483 | * | |
1484 | * This will be fixed with VFS changes (lookup-intent). | |
1485 | */ | |
1486 | static int | |
1487 | nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, | |
1488 | struct iattr *sattr) | |
1489 | { | |
1490 | struct rpc_cred *cred; | |
1491 | struct inode *inode = dentry->d_inode; | |
1492 | struct nfs_open_context *ctx; | |
1493 | struct nfs4_state *state = NULL; | |
1494 | int status; | |
1495 | ||
1496 | nfs_fattr_init(fattr); | |
1497 | ||
1498 | cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0); | |
1499 | if (IS_ERR(cred)) | |
1500 | return PTR_ERR(cred); | |
1501 | ||
1502 | /* Search for an existing open(O_WRITE) file */ | |
1503 | ctx = nfs_find_open_context(inode, cred, FMODE_WRITE); | |
1504 | if (ctx != NULL) | |
1505 | state = ctx->state; | |
1506 | ||
1507 | status = nfs4_do_setattr(NFS_SERVER(inode), fattr, | |
1508 | NFS_FH(inode), sattr, state); | |
1509 | if (status == 0) | |
1510 | nfs_setattr_update_inode(inode, sattr); | |
1511 | if (ctx != NULL) | |
1512 | put_nfs_open_context(ctx); | |
1513 | put_rpccred(cred); | |
1514 | return status; | |
1515 | } | |
1516 | ||
1517 | static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name, | |
1518 | struct nfs_fh *fhandle, struct nfs_fattr *fattr) | |
1519 | { | |
1520 | int status; | |
1521 | struct nfs_server *server = NFS_SERVER(dir); | |
1522 | struct nfs4_lookup_arg args = { | |
1523 | .bitmask = server->attr_bitmask, | |
1524 | .dir_fh = NFS_FH(dir), | |
1525 | .name = name, | |
1526 | }; | |
1527 | struct nfs4_lookup_res res = { | |
1528 | .server = server, | |
1529 | .fattr = fattr, | |
1530 | .fh = fhandle, | |
1531 | }; | |
1532 | struct rpc_message msg = { | |
1533 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], | |
1534 | .rpc_argp = &args, | |
1535 | .rpc_resp = &res, | |
1536 | }; | |
1537 | ||
1538 | nfs_fattr_init(fattr); | |
1539 | ||
1540 | dprintk("NFS call lookup %s\n", name->name); | |
1541 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
1542 | dprintk("NFS reply lookup: %d\n", status); | |
1543 | return status; | |
1544 | } | |
1545 | ||
1546 | static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr) | |
1547 | { | |
1548 | struct nfs4_exception exception = { }; | |
1549 | int err; | |
1550 | do { | |
1551 | err = nfs4_handle_exception(NFS_SERVER(dir), | |
1552 | _nfs4_proc_lookup(dir, name, fhandle, fattr), | |
1553 | &exception); | |
1554 | } while (exception.retry); | |
1555 | return err; | |
1556 | } | |
1557 | ||
1558 | static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) | |
1559 | { | |
1560 | struct nfs4_accessargs args = { | |
1561 | .fh = NFS_FH(inode), | |
1562 | }; | |
1563 | struct nfs4_accessres res = { 0 }; | |
1564 | struct rpc_message msg = { | |
1565 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], | |
1566 | .rpc_argp = &args, | |
1567 | .rpc_resp = &res, | |
1568 | .rpc_cred = entry->cred, | |
1569 | }; | |
1570 | int mode = entry->mask; | |
1571 | int status; | |
1572 | ||
1573 | /* | |
1574 | * Determine which access bits we want to ask for... | |
1575 | */ | |
1576 | if (mode & MAY_READ) | |
1577 | args.access |= NFS4_ACCESS_READ; | |
1578 | if (S_ISDIR(inode->i_mode)) { | |
1579 | if (mode & MAY_WRITE) | |
1580 | args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; | |
1581 | if (mode & MAY_EXEC) | |
1582 | args.access |= NFS4_ACCESS_LOOKUP; | |
1583 | } else { | |
1584 | if (mode & MAY_WRITE) | |
1585 | args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; | |
1586 | if (mode & MAY_EXEC) | |
1587 | args.access |= NFS4_ACCESS_EXECUTE; | |
1588 | } | |
1589 | status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); | |
1590 | if (!status) { | |
1591 | entry->mask = 0; | |
1592 | if (res.access & NFS4_ACCESS_READ) | |
1593 | entry->mask |= MAY_READ; | |
1594 | if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) | |
1595 | entry->mask |= MAY_WRITE; | |
1596 | if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) | |
1597 | entry->mask |= MAY_EXEC; | |
1598 | } | |
1599 | return status; | |
1600 | } | |
1601 | ||
1602 | static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) | |
1603 | { | |
1604 | struct nfs4_exception exception = { }; | |
1605 | int err; | |
1606 | do { | |
1607 | err = nfs4_handle_exception(NFS_SERVER(inode), | |
1608 | _nfs4_proc_access(inode, entry), | |
1609 | &exception); | |
1610 | } while (exception.retry); | |
1611 | return err; | |
1612 | } | |
1613 | ||
1614 | /* | |
1615 | * TODO: For the time being, we don't try to get any attributes | |
1616 | * along with any of the zero-copy operations READ, READDIR, | |
1617 | * READLINK, WRITE. | |
1618 | * | |
1619 | * In the case of the first three, we want to put the GETATTR | |
1620 | * after the read-type operation -- this is because it is hard | |
1621 | * to predict the length of a GETATTR response in v4, and thus | |
1622 | * align the READ data correctly. This means that the GETATTR | |
1623 | * may end up partially falling into the page cache, and we should | |
1624 | * shift it into the 'tail' of the xdr_buf before processing. | |
1625 | * To do this efficiently, we need to know the total length | |
1626 | * of data received, which doesn't seem to be available outside | |
1627 | * of the RPC layer. | |
1628 | * | |
1629 | * In the case of WRITE, we also want to put the GETATTR after | |
1630 | * the operation -- in this case because we want to make sure | |
1631 | * we get the post-operation mtime and size. This means that | |
1632 | * we can't use xdr_encode_pages() as written: we need a variant | |
1633 | * of it which would leave room in the 'tail' iovec. | |
1634 | * | |
1635 | * Both of these changes to the XDR layer would in fact be quite | |
1636 | * minor, but I decided to leave them for a subsequent patch. | |
1637 | */ | |
1638 | static int _nfs4_proc_readlink(struct inode *inode, struct page *page, | |
1639 | unsigned int pgbase, unsigned int pglen) | |
1640 | { | |
1641 | struct nfs4_readlink args = { | |
1642 | .fh = NFS_FH(inode), | |
1643 | .pgbase = pgbase, | |
1644 | .pglen = pglen, | |
1645 | .pages = &page, | |
1646 | }; | |
1647 | struct rpc_message msg = { | |
1648 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], | |
1649 | .rpc_argp = &args, | |
1650 | .rpc_resp = NULL, | |
1651 | }; | |
1652 | ||
1653 | return rpc_call_sync(NFS_CLIENT(inode), &msg, 0); | |
1654 | } | |
1655 | ||
1656 | static int nfs4_proc_readlink(struct inode *inode, struct page *page, | |
1657 | unsigned int pgbase, unsigned int pglen) | |
1658 | { | |
1659 | struct nfs4_exception exception = { }; | |
1660 | int err; | |
1661 | do { | |
1662 | err = nfs4_handle_exception(NFS_SERVER(inode), | |
1663 | _nfs4_proc_readlink(inode, page, pgbase, pglen), | |
1664 | &exception); | |
1665 | } while (exception.retry); | |
1666 | return err; | |
1667 | } | |
1668 | ||
1669 | static int _nfs4_proc_read(struct nfs_read_data *rdata) | |
1670 | { | |
1671 | int flags = rdata->flags; | |
1672 | struct inode *inode = rdata->inode; | |
1673 | struct nfs_fattr *fattr = rdata->res.fattr; | |
1674 | struct nfs_server *server = NFS_SERVER(inode); | |
1675 | struct rpc_message msg = { | |
1676 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ], | |
1677 | .rpc_argp = &rdata->args, | |
1678 | .rpc_resp = &rdata->res, | |
1679 | .rpc_cred = rdata->cred, | |
1680 | }; | |
1681 | unsigned long timestamp = jiffies; | |
1682 | int status; | |
1683 | ||
1684 | dprintk("NFS call read %d @ %Ld\n", rdata->args.count, | |
1685 | (long long) rdata->args.offset); | |
1686 | ||
1687 | nfs_fattr_init(fattr); | |
1688 | status = rpc_call_sync(server->client, &msg, flags); | |
1689 | if (!status) | |
1690 | renew_lease(server, timestamp); | |
1691 | dprintk("NFS reply read: %d\n", status); | |
1692 | return status; | |
1693 | } | |
1694 | ||
1695 | static int nfs4_proc_read(struct nfs_read_data *rdata) | |
1696 | { | |
1697 | struct nfs4_exception exception = { }; | |
1698 | int err; | |
1699 | do { | |
1700 | err = nfs4_handle_exception(NFS_SERVER(rdata->inode), | |
1701 | _nfs4_proc_read(rdata), | |
1702 | &exception); | |
1703 | } while (exception.retry); | |
1704 | return err; | |
1705 | } | |
1706 | ||
1707 | static int _nfs4_proc_write(struct nfs_write_data *wdata) | |
1708 | { | |
1709 | int rpcflags = wdata->flags; | |
1710 | struct inode *inode = wdata->inode; | |
1711 | struct nfs_fattr *fattr = wdata->res.fattr; | |
1712 | struct nfs_server *server = NFS_SERVER(inode); | |
1713 | struct rpc_message msg = { | |
1714 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE], | |
1715 | .rpc_argp = &wdata->args, | |
1716 | .rpc_resp = &wdata->res, | |
1717 | .rpc_cred = wdata->cred, | |
1718 | }; | |
1719 | int status; | |
1720 | ||
1721 | dprintk("NFS call write %d @ %Ld\n", wdata->args.count, | |
1722 | (long long) wdata->args.offset); | |
1723 | ||
1724 | wdata->args.bitmask = server->attr_bitmask; | |
1725 | wdata->res.server = server; | |
1726 | wdata->timestamp = jiffies; | |
1727 | nfs_fattr_init(fattr); | |
1728 | status = rpc_call_sync(server->client, &msg, rpcflags); | |
1729 | dprintk("NFS reply write: %d\n", status); | |
1730 | if (status < 0) | |
1731 | return status; | |
1732 | renew_lease(server, wdata->timestamp); | |
1733 | nfs_post_op_update_inode(inode, fattr); | |
1734 | return wdata->res.count; | |
1735 | } | |
1736 | ||
1737 | static int nfs4_proc_write(struct nfs_write_data *wdata) | |
1738 | { | |
1739 | struct nfs4_exception exception = { }; | |
1740 | int err; | |
1741 | do { | |
1742 | err = nfs4_handle_exception(NFS_SERVER(wdata->inode), | |
1743 | _nfs4_proc_write(wdata), | |
1744 | &exception); | |
1745 | } while (exception.retry); | |
1746 | return err; | |
1747 | } | |
1748 | ||
1749 | static int _nfs4_proc_commit(struct nfs_write_data *cdata) | |
1750 | { | |
1751 | struct inode *inode = cdata->inode; | |
1752 | struct nfs_fattr *fattr = cdata->res.fattr; | |
1753 | struct nfs_server *server = NFS_SERVER(inode); | |
1754 | struct rpc_message msg = { | |
1755 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], | |
1756 | .rpc_argp = &cdata->args, | |
1757 | .rpc_resp = &cdata->res, | |
1758 | .rpc_cred = cdata->cred, | |
1759 | }; | |
1760 | int status; | |
1761 | ||
1762 | dprintk("NFS call commit %d @ %Ld\n", cdata->args.count, | |
1763 | (long long) cdata->args.offset); | |
1764 | ||
1765 | cdata->args.bitmask = server->attr_bitmask; | |
1766 | cdata->res.server = server; | |
1767 | cdata->timestamp = jiffies; | |
1768 | nfs_fattr_init(fattr); | |
1769 | status = rpc_call_sync(server->client, &msg, 0); | |
1770 | if (status >= 0) | |
1771 | renew_lease(server, cdata->timestamp); | |
1772 | dprintk("NFS reply commit: %d\n", status); | |
1773 | if (status >= 0) | |
1774 | nfs_post_op_update_inode(inode, fattr); | |
1775 | return status; | |
1776 | } | |
1777 | ||
1778 | static int nfs4_proc_commit(struct nfs_write_data *cdata) | |
1779 | { | |
1780 | struct nfs4_exception exception = { }; | |
1781 | int err; | |
1782 | do { | |
1783 | err = nfs4_handle_exception(NFS_SERVER(cdata->inode), | |
1784 | _nfs4_proc_commit(cdata), | |
1785 | &exception); | |
1786 | } while (exception.retry); | |
1787 | return err; | |
1788 | } | |
1789 | ||
1790 | /* | |
1791 | * Got race? | |
1792 | * We will need to arrange for the VFS layer to provide an atomic open. | |
1793 | * Until then, this create/open method is prone to inefficiency and race | |
1794 | * conditions due to the lookup, create, and open VFS calls from sys_open() | |
1795 | * placed on the wire. | |
1796 | * | |
1797 | * Given the above sorry state of affairs, I'm simply sending an OPEN. | |
1798 | * The file will be opened again in the subsequent VFS open call | |
1799 | * (nfs4_proc_file_open). | |
1800 | * | |
1801 | * The open for read will just hang around to be used by any process that | |
1802 | * opens the file O_RDONLY. This will all be resolved with the VFS changes. | |
1803 | */ | |
1804 | ||
1805 | static int | |
1806 | nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, | |
1807 | int flags, struct nameidata *nd) | |
1808 | { | |
1809 | struct nfs4_state *state; | |
1810 | struct rpc_cred *cred; | |
1811 | int status = 0; | |
1812 | ||
1813 | cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0); | |
1814 | if (IS_ERR(cred)) { | |
1815 | status = PTR_ERR(cred); | |
1816 | goto out; | |
1817 | } | |
1818 | state = nfs4_do_open(dir, dentry, flags, sattr, cred); | |
1819 | put_rpccred(cred); | |
1820 | if (IS_ERR(state)) { | |
1821 | status = PTR_ERR(state); | |
1822 | goto out; | |
1823 | } | |
1824 | d_instantiate(dentry, igrab(state->inode)); | |
1825 | if (flags & O_EXCL) { | |
1826 | struct nfs_fattr fattr; | |
1827 | status = nfs4_do_setattr(NFS_SERVER(dir), &fattr, | |
1828 | NFS_FH(state->inode), sattr, state); | |
1829 | if (status == 0) | |
1830 | nfs_setattr_update_inode(state->inode, sattr); | |
1831 | } | |
1832 | if (status == 0 && nd != NULL && (nd->flags & LOOKUP_OPEN)) | |
1833 | nfs4_intent_set_file(nd, dentry, state); | |
1834 | else | |
1835 | nfs4_close_state(state, flags); | |
1836 | out: | |
1837 | return status; | |
1838 | } | |
1839 | ||
1840 | static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) | |
1841 | { | |
1842 | struct nfs_server *server = NFS_SERVER(dir); | |
1843 | struct nfs4_remove_arg args = { | |
1844 | .fh = NFS_FH(dir), | |
1845 | .name = name, | |
1846 | .bitmask = server->attr_bitmask, | |
1847 | }; | |
1848 | struct nfs_fattr dir_attr; | |
1849 | struct nfs4_remove_res res = { | |
1850 | .server = server, | |
1851 | .dir_attr = &dir_attr, | |
1852 | }; | |
1853 | struct rpc_message msg = { | |
1854 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], | |
1855 | .rpc_argp = &args, | |
1856 | .rpc_resp = &res, | |
1857 | }; | |
1858 | int status; | |
1859 | ||
1860 | nfs_fattr_init(res.dir_attr); | |
1861 | status = rpc_call_sync(server->client, &msg, 0); | |
1862 | if (status == 0) { | |
1863 | update_changeattr(dir, &res.cinfo); | |
1864 | nfs_post_op_update_inode(dir, res.dir_attr); | |
1865 | } | |
1866 | return status; | |
1867 | } | |
1868 | ||
1869 | static int nfs4_proc_remove(struct inode *dir, struct qstr *name) | |
1870 | { | |
1871 | struct nfs4_exception exception = { }; | |
1872 | int err; | |
1873 | do { | |
1874 | err = nfs4_handle_exception(NFS_SERVER(dir), | |
1875 | _nfs4_proc_remove(dir, name), | |
1876 | &exception); | |
1877 | } while (exception.retry); | |
1878 | return err; | |
1879 | } | |
1880 | ||
1881 | struct unlink_desc { | |
1882 | struct nfs4_remove_arg args; | |
1883 | struct nfs4_remove_res res; | |
1884 | struct nfs_fattr dir_attr; | |
1885 | }; | |
1886 | ||
1887 | static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, | |
1888 | struct qstr *name) | |
1889 | { | |
1890 | struct nfs_server *server = NFS_SERVER(dir->d_inode); | |
1891 | struct unlink_desc *up; | |
1892 | ||
1893 | up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL); | |
1894 | if (!up) | |
1895 | return -ENOMEM; | |
1896 | ||
1897 | up->args.fh = NFS_FH(dir->d_inode); | |
1898 | up->args.name = name; | |
1899 | up->args.bitmask = server->attr_bitmask; | |
1900 | up->res.server = server; | |
1901 | up->res.dir_attr = &up->dir_attr; | |
1902 | ||
1903 | msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; | |
1904 | msg->rpc_argp = &up->args; | |
1905 | msg->rpc_resp = &up->res; | |
1906 | return 0; | |
1907 | } | |
1908 | ||
1909 | static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task) | |
1910 | { | |
1911 | struct rpc_message *msg = &task->tk_msg; | |
1912 | struct unlink_desc *up; | |
1913 | ||
1914 | if (msg->rpc_resp != NULL) { | |
1915 | up = container_of(msg->rpc_resp, struct unlink_desc, res); | |
1916 | update_changeattr(dir->d_inode, &up->res.cinfo); | |
1917 | nfs_post_op_update_inode(dir->d_inode, up->res.dir_attr); | |
1918 | kfree(up); | |
1919 | msg->rpc_resp = NULL; | |
1920 | msg->rpc_argp = NULL; | |
1921 | } | |
1922 | return 0; | |
1923 | } | |
1924 | ||
1925 | static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, | |
1926 | struct inode *new_dir, struct qstr *new_name) | |
1927 | { | |
1928 | struct nfs_server *server = NFS_SERVER(old_dir); | |
1929 | struct nfs4_rename_arg arg = { | |
1930 | .old_dir = NFS_FH(old_dir), | |
1931 | .new_dir = NFS_FH(new_dir), | |
1932 | .old_name = old_name, | |
1933 | .new_name = new_name, | |
1934 | .bitmask = server->attr_bitmask, | |
1935 | }; | |
1936 | struct nfs_fattr old_fattr, new_fattr; | |
1937 | struct nfs4_rename_res res = { | |
1938 | .server = server, | |
1939 | .old_fattr = &old_fattr, | |
1940 | .new_fattr = &new_fattr, | |
1941 | }; | |
1942 | struct rpc_message msg = { | |
1943 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME], | |
1944 | .rpc_argp = &arg, | |
1945 | .rpc_resp = &res, | |
1946 | }; | |
1947 | int status; | |
1948 | ||
1949 | nfs_fattr_init(res.old_fattr); | |
1950 | nfs_fattr_init(res.new_fattr); | |
1951 | status = rpc_call_sync(server->client, &msg, 0); | |
1952 | ||
1953 | if (!status) { | |
1954 | update_changeattr(old_dir, &res.old_cinfo); | |
1955 | nfs_post_op_update_inode(old_dir, res.old_fattr); | |
1956 | update_changeattr(new_dir, &res.new_cinfo); | |
1957 | nfs_post_op_update_inode(new_dir, res.new_fattr); | |
1958 | } | |
1959 | return status; | |
1960 | } | |
1961 | ||
1962 | static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, | |
1963 | struct inode *new_dir, struct qstr *new_name) | |
1964 | { | |
1965 | struct nfs4_exception exception = { }; | |
1966 | int err; | |
1967 | do { | |
1968 | err = nfs4_handle_exception(NFS_SERVER(old_dir), | |
1969 | _nfs4_proc_rename(old_dir, old_name, | |
1970 | new_dir, new_name), | |
1971 | &exception); | |
1972 | } while (exception.retry); | |
1973 | return err; | |
1974 | } | |
1975 | ||
1976 | static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) | |
1977 | { | |
1978 | struct nfs_server *server = NFS_SERVER(inode); | |
1979 | struct nfs4_link_arg arg = { | |
1980 | .fh = NFS_FH(inode), | |
1981 | .dir_fh = NFS_FH(dir), | |
1982 | .name = name, | |
1983 | .bitmask = server->attr_bitmask, | |
1984 | }; | |
1985 | struct nfs_fattr fattr, dir_attr; | |
1986 | struct nfs4_link_res res = { | |
1987 | .server = server, | |
1988 | .fattr = &fattr, | |
1989 | .dir_attr = &dir_attr, | |
1990 | }; | |
1991 | struct rpc_message msg = { | |
1992 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], | |
1993 | .rpc_argp = &arg, | |
1994 | .rpc_resp = &res, | |
1995 | }; | |
1996 | int status; | |
1997 | ||
1998 | nfs_fattr_init(res.fattr); | |
1999 | nfs_fattr_init(res.dir_attr); | |
2000 | status = rpc_call_sync(server->client, &msg, 0); | |
2001 | if (!status) { | |
2002 | update_changeattr(dir, &res.cinfo); | |
2003 | nfs_post_op_update_inode(dir, res.dir_attr); | |
2004 | nfs_refresh_inode(inode, res.fattr); | |
2005 | } | |
2006 | ||
2007 | return status; | |
2008 | } | |
2009 | ||
2010 | static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) | |
2011 | { | |
2012 | struct nfs4_exception exception = { }; | |
2013 | int err; | |
2014 | do { | |
2015 | err = nfs4_handle_exception(NFS_SERVER(inode), | |
2016 | _nfs4_proc_link(inode, dir, name), | |
2017 | &exception); | |
2018 | } while (exception.retry); | |
2019 | return err; | |
2020 | } | |
2021 | ||
2022 | static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name, | |
2023 | struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle, | |
2024 | struct nfs_fattr *fattr) | |
2025 | { | |
2026 | struct nfs_server *server = NFS_SERVER(dir); | |
2027 | struct nfs_fattr dir_fattr; | |
2028 | struct nfs4_create_arg arg = { | |
2029 | .dir_fh = NFS_FH(dir), | |
2030 | .server = server, | |
2031 | .name = name, | |
2032 | .attrs = sattr, | |
2033 | .ftype = NF4LNK, | |
2034 | .bitmask = server->attr_bitmask, | |
2035 | }; | |
2036 | struct nfs4_create_res res = { | |
2037 | .server = server, | |
2038 | .fh = fhandle, | |
2039 | .fattr = fattr, | |
2040 | .dir_fattr = &dir_fattr, | |
2041 | }; | |
2042 | struct rpc_message msg = { | |
2043 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK], | |
2044 | .rpc_argp = &arg, | |
2045 | .rpc_resp = &res, | |
2046 | }; | |
2047 | int status; | |
2048 | ||
2049 | if (path->len > NFS4_MAXPATHLEN) | |
2050 | return -ENAMETOOLONG; | |
2051 | arg.u.symlink = path; | |
2052 | nfs_fattr_init(fattr); | |
2053 | nfs_fattr_init(&dir_fattr); | |
2054 | ||
2055 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
2056 | if (!status) | |
2057 | update_changeattr(dir, &res.dir_cinfo); | |
2058 | nfs_post_op_update_inode(dir, res.dir_fattr); | |
2059 | return status; | |
2060 | } | |
2061 | ||
2062 | static int nfs4_proc_symlink(struct inode *dir, struct qstr *name, | |
2063 | struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle, | |
2064 | struct nfs_fattr *fattr) | |
2065 | { | |
2066 | struct nfs4_exception exception = { }; | |
2067 | int err; | |
2068 | do { | |
2069 | err = nfs4_handle_exception(NFS_SERVER(dir), | |
2070 | _nfs4_proc_symlink(dir, name, path, sattr, | |
2071 | fhandle, fattr), | |
2072 | &exception); | |
2073 | } while (exception.retry); | |
2074 | return err; | |
2075 | } | |
2076 | ||
2077 | static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, | |
2078 | struct iattr *sattr) | |
2079 | { | |
2080 | struct nfs_server *server = NFS_SERVER(dir); | |
2081 | struct nfs_fh fhandle; | |
2082 | struct nfs_fattr fattr, dir_fattr; | |
2083 | struct nfs4_create_arg arg = { | |
2084 | .dir_fh = NFS_FH(dir), | |
2085 | .server = server, | |
2086 | .name = &dentry->d_name, | |
2087 | .attrs = sattr, | |
2088 | .ftype = NF4DIR, | |
2089 | .bitmask = server->attr_bitmask, | |
2090 | }; | |
2091 | struct nfs4_create_res res = { | |
2092 | .server = server, | |
2093 | .fh = &fhandle, | |
2094 | .fattr = &fattr, | |
2095 | .dir_fattr = &dir_fattr, | |
2096 | }; | |
2097 | struct rpc_message msg = { | |
2098 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], | |
2099 | .rpc_argp = &arg, | |
2100 | .rpc_resp = &res, | |
2101 | }; | |
2102 | int status; | |
2103 | ||
2104 | nfs_fattr_init(&fattr); | |
2105 | nfs_fattr_init(&dir_fattr); | |
2106 | ||
2107 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
2108 | if (!status) { | |
2109 | update_changeattr(dir, &res.dir_cinfo); | |
2110 | nfs_post_op_update_inode(dir, res.dir_fattr); | |
2111 | status = nfs_instantiate(dentry, &fhandle, &fattr); | |
2112 | } | |
2113 | return status; | |
2114 | } | |
2115 | ||
2116 | static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, | |
2117 | struct iattr *sattr) | |
2118 | { | |
2119 | struct nfs4_exception exception = { }; | |
2120 | int err; | |
2121 | do { | |
2122 | err = nfs4_handle_exception(NFS_SERVER(dir), | |
2123 | _nfs4_proc_mkdir(dir, dentry, sattr), | |
2124 | &exception); | |
2125 | } while (exception.retry); | |
2126 | return err; | |
2127 | } | |
2128 | ||
2129 | static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, | |
2130 | u64 cookie, struct page *page, unsigned int count, int plus) | |
2131 | { | |
2132 | struct inode *dir = dentry->d_inode; | |
2133 | struct nfs4_readdir_arg args = { | |
2134 | .fh = NFS_FH(dir), | |
2135 | .pages = &page, | |
2136 | .pgbase = 0, | |
2137 | .count = count, | |
2138 | .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, | |
2139 | }; | |
2140 | struct nfs4_readdir_res res; | |
2141 | struct rpc_message msg = { | |
2142 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], | |
2143 | .rpc_argp = &args, | |
2144 | .rpc_resp = &res, | |
2145 | .rpc_cred = cred, | |
2146 | }; | |
2147 | int status; | |
2148 | ||
2149 | dprintk("%s: dentry = %s/%s, cookie = %Lu\n", __FUNCTION__, | |
2150 | dentry->d_parent->d_name.name, | |
2151 | dentry->d_name.name, | |
2152 | (unsigned long long)cookie); | |
2153 | lock_kernel(); | |
2154 | nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args); | |
2155 | res.pgbase = args.pgbase; | |
2156 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
2157 | if (status == 0) | |
2158 | memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE); | |
2159 | unlock_kernel(); | |
2160 | dprintk("%s: returns %d\n", __FUNCTION__, status); | |
2161 | return status; | |
2162 | } | |
2163 | ||
2164 | static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, | |
2165 | u64 cookie, struct page *page, unsigned int count, int plus) | |
2166 | { | |
2167 | struct nfs4_exception exception = { }; | |
2168 | int err; | |
2169 | do { | |
2170 | err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), | |
2171 | _nfs4_proc_readdir(dentry, cred, cookie, | |
2172 | page, count, plus), | |
2173 | &exception); | |
2174 | } while (exception.retry); | |
2175 | return err; | |
2176 | } | |
2177 | ||
2178 | static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, | |
2179 | struct iattr *sattr, dev_t rdev) | |
2180 | { | |
2181 | struct nfs_server *server = NFS_SERVER(dir); | |
2182 | struct nfs_fh fh; | |
2183 | struct nfs_fattr fattr, dir_fattr; | |
2184 | struct nfs4_create_arg arg = { | |
2185 | .dir_fh = NFS_FH(dir), | |
2186 | .server = server, | |
2187 | .name = &dentry->d_name, | |
2188 | .attrs = sattr, | |
2189 | .bitmask = server->attr_bitmask, | |
2190 | }; | |
2191 | struct nfs4_create_res res = { | |
2192 | .server = server, | |
2193 | .fh = &fh, | |
2194 | .fattr = &fattr, | |
2195 | .dir_fattr = &dir_fattr, | |
2196 | }; | |
2197 | struct rpc_message msg = { | |
2198 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], | |
2199 | .rpc_argp = &arg, | |
2200 | .rpc_resp = &res, | |
2201 | }; | |
2202 | int status; | |
2203 | int mode = sattr->ia_mode; | |
2204 | ||
2205 | nfs_fattr_init(&fattr); | |
2206 | nfs_fattr_init(&dir_fattr); | |
2207 | ||
2208 | BUG_ON(!(sattr->ia_valid & ATTR_MODE)); | |
2209 | BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode)); | |
2210 | if (S_ISFIFO(mode)) | |
2211 | arg.ftype = NF4FIFO; | |
2212 | else if (S_ISBLK(mode)) { | |
2213 | arg.ftype = NF4BLK; | |
2214 | arg.u.device.specdata1 = MAJOR(rdev); | |
2215 | arg.u.device.specdata2 = MINOR(rdev); | |
2216 | } | |
2217 | else if (S_ISCHR(mode)) { | |
2218 | arg.ftype = NF4CHR; | |
2219 | arg.u.device.specdata1 = MAJOR(rdev); | |
2220 | arg.u.device.specdata2 = MINOR(rdev); | |
2221 | } | |
2222 | else | |
2223 | arg.ftype = NF4SOCK; | |
2224 | ||
2225 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
2226 | if (status == 0) { | |
2227 | update_changeattr(dir, &res.dir_cinfo); | |
2228 | nfs_post_op_update_inode(dir, res.dir_fattr); | |
2229 | status = nfs_instantiate(dentry, &fh, &fattr); | |
2230 | } | |
2231 | return status; | |
2232 | } | |
2233 | ||
2234 | static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, | |
2235 | struct iattr *sattr, dev_t rdev) | |
2236 | { | |
2237 | struct nfs4_exception exception = { }; | |
2238 | int err; | |
2239 | do { | |
2240 | err = nfs4_handle_exception(NFS_SERVER(dir), | |
2241 | _nfs4_proc_mknod(dir, dentry, sattr, rdev), | |
2242 | &exception); | |
2243 | } while (exception.retry); | |
2244 | return err; | |
2245 | } | |
2246 | ||
2247 | static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, | |
2248 | struct nfs_fsstat *fsstat) | |
2249 | { | |
2250 | struct nfs4_statfs_arg args = { | |
2251 | .fh = fhandle, | |
2252 | .bitmask = server->attr_bitmask, | |
2253 | }; | |
2254 | struct rpc_message msg = { | |
2255 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], | |
2256 | .rpc_argp = &args, | |
2257 | .rpc_resp = fsstat, | |
2258 | }; | |
2259 | ||
2260 | nfs_fattr_init(fsstat->fattr); | |
2261 | return rpc_call_sync(server->client, &msg, 0); | |
2262 | } | |
2263 | ||
2264 | static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) | |
2265 | { | |
2266 | struct nfs4_exception exception = { }; | |
2267 | int err; | |
2268 | do { | |
2269 | err = nfs4_handle_exception(server, | |
2270 | _nfs4_proc_statfs(server, fhandle, fsstat), | |
2271 | &exception); | |
2272 | } while (exception.retry); | |
2273 | return err; | |
2274 | } | |
2275 | ||
2276 | static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, | |
2277 | struct nfs_fsinfo *fsinfo) | |
2278 | { | |
2279 | struct nfs4_fsinfo_arg args = { | |
2280 | .fh = fhandle, | |
2281 | .bitmask = server->attr_bitmask, | |
2282 | }; | |
2283 | struct rpc_message msg = { | |
2284 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], | |
2285 | .rpc_argp = &args, | |
2286 | .rpc_resp = fsinfo, | |
2287 | }; | |
2288 | ||
2289 | return rpc_call_sync(server->client, &msg, 0); | |
2290 | } | |
2291 | ||
2292 | static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) | |
2293 | { | |
2294 | struct nfs4_exception exception = { }; | |
2295 | int err; | |
2296 | ||
2297 | do { | |
2298 | err = nfs4_handle_exception(server, | |
2299 | _nfs4_do_fsinfo(server, fhandle, fsinfo), | |
2300 | &exception); | |
2301 | } while (exception.retry); | |
2302 | return err; | |
2303 | } | |
2304 | ||
2305 | static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) | |
2306 | { | |
2307 | nfs_fattr_init(fsinfo->fattr); | |
2308 | return nfs4_do_fsinfo(server, fhandle, fsinfo); | |
2309 | } | |
2310 | ||
2311 | static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, | |
2312 | struct nfs_pathconf *pathconf) | |
2313 | { | |
2314 | struct nfs4_pathconf_arg args = { | |
2315 | .fh = fhandle, | |
2316 | .bitmask = server->attr_bitmask, | |
2317 | }; | |
2318 | struct rpc_message msg = { | |
2319 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], | |
2320 | .rpc_argp = &args, | |
2321 | .rpc_resp = pathconf, | |
2322 | }; | |
2323 | ||
2324 | /* None of the pathconf attributes are mandatory to implement */ | |
2325 | if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { | |
2326 | memset(pathconf, 0, sizeof(*pathconf)); | |
2327 | return 0; | |
2328 | } | |
2329 | ||
2330 | nfs_fattr_init(pathconf->fattr); | |
2331 | return rpc_call_sync(server->client, &msg, 0); | |
2332 | } | |
2333 | ||
2334 | static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, | |
2335 | struct nfs_pathconf *pathconf) | |
2336 | { | |
2337 | struct nfs4_exception exception = { }; | |
2338 | int err; | |
2339 | ||
2340 | do { | |
2341 | err = nfs4_handle_exception(server, | |
2342 | _nfs4_proc_pathconf(server, fhandle, pathconf), | |
2343 | &exception); | |
2344 | } while (exception.retry); | |
2345 | return err; | |
2346 | } | |
2347 | ||
2348 | static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data) | |
2349 | { | |
2350 | struct nfs_server *server = NFS_SERVER(data->inode); | |
2351 | ||
2352 | if (nfs4_async_handle_error(task, server) == -EAGAIN) { | |
2353 | rpc_restart_call(task); | |
2354 | return -EAGAIN; | |
2355 | } | |
2356 | if (task->tk_status > 0) | |
2357 | renew_lease(server, data->timestamp); | |
2358 | return 0; | |
2359 | } | |
2360 | ||
2361 | static void nfs4_proc_read_setup(struct nfs_read_data *data) | |
2362 | { | |
2363 | struct rpc_message msg = { | |
2364 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ], | |
2365 | .rpc_argp = &data->args, | |
2366 | .rpc_resp = &data->res, | |
2367 | .rpc_cred = data->cred, | |
2368 | }; | |
2369 | ||
2370 | data->timestamp = jiffies; | |
2371 | ||
2372 | rpc_call_setup(&data->task, &msg, 0); | |
2373 | } | |
2374 | ||
2375 | static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data) | |
2376 | { | |
2377 | struct inode *inode = data->inode; | |
2378 | ||
2379 | if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { | |
2380 | rpc_restart_call(task); | |
2381 | return -EAGAIN; | |
2382 | } | |
2383 | if (task->tk_status >= 0) { | |
2384 | renew_lease(NFS_SERVER(inode), data->timestamp); | |
2385 | nfs_post_op_update_inode(inode, data->res.fattr); | |
2386 | } | |
2387 | return 0; | |
2388 | } | |
2389 | ||
2390 | static void nfs4_proc_write_setup(struct nfs_write_data *data, int how) | |
2391 | { | |
2392 | struct rpc_message msg = { | |
2393 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE], | |
2394 | .rpc_argp = &data->args, | |
2395 | .rpc_resp = &data->res, | |
2396 | .rpc_cred = data->cred, | |
2397 | }; | |
2398 | struct inode *inode = data->inode; | |
2399 | struct nfs_server *server = NFS_SERVER(inode); | |
2400 | int stable; | |
2401 | ||
2402 | if (how & FLUSH_STABLE) { | |
2403 | if (!NFS_I(inode)->ncommit) | |
2404 | stable = NFS_FILE_SYNC; | |
2405 | else | |
2406 | stable = NFS_DATA_SYNC; | |
2407 | } else | |
2408 | stable = NFS_UNSTABLE; | |
2409 | data->args.stable = stable; | |
2410 | data->args.bitmask = server->attr_bitmask; | |
2411 | data->res.server = server; | |
2412 | ||
2413 | data->timestamp = jiffies; | |
2414 | ||
2415 | /* Finalize the task. */ | |
2416 | rpc_call_setup(&data->task, &msg, 0); | |
2417 | } | |
2418 | ||
2419 | static int nfs4_commit_done(struct rpc_task *task, struct nfs_write_data *data) | |
2420 | { | |
2421 | struct inode *inode = data->inode; | |
2422 | ||
2423 | if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { | |
2424 | rpc_restart_call(task); | |
2425 | return -EAGAIN; | |
2426 | } | |
2427 | if (task->tk_status >= 0) | |
2428 | nfs_post_op_update_inode(inode, data->res.fattr); | |
2429 | return 0; | |
2430 | } | |
2431 | ||
2432 | static void nfs4_proc_commit_setup(struct nfs_write_data *data, int how) | |
2433 | { | |
2434 | struct rpc_message msg = { | |
2435 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], | |
2436 | .rpc_argp = &data->args, | |
2437 | .rpc_resp = &data->res, | |
2438 | .rpc_cred = data->cred, | |
2439 | }; | |
2440 | struct nfs_server *server = NFS_SERVER(data->inode); | |
2441 | ||
2442 | data->args.bitmask = server->attr_bitmask; | |
2443 | data->res.server = server; | |
2444 | ||
2445 | rpc_call_setup(&data->task, &msg, 0); | |
2446 | } | |
2447 | ||
2448 | /* | |
2449 | * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special | |
2450 | * standalone procedure for queueing an asynchronous RENEW. | |
2451 | */ | |
2452 | static void nfs4_renew_done(struct rpc_task *task, void *data) | |
2453 | { | |
2454 | struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp; | |
2455 | unsigned long timestamp = (unsigned long)data; | |
2456 | ||
2457 | if (task->tk_status < 0) { | |
2458 | switch (task->tk_status) { | |
2459 | case -NFS4ERR_STALE_CLIENTID: | |
2460 | case -NFS4ERR_EXPIRED: | |
2461 | case -NFS4ERR_CB_PATH_DOWN: | |
2462 | nfs4_schedule_state_recovery(clp); | |
2463 | } | |
2464 | return; | |
2465 | } | |
2466 | spin_lock(&clp->cl_lock); | |
2467 | if (time_before(clp->cl_last_renewal,timestamp)) | |
2468 | clp->cl_last_renewal = timestamp; | |
2469 | spin_unlock(&clp->cl_lock); | |
2470 | } | |
2471 | ||
2472 | static const struct rpc_call_ops nfs4_renew_ops = { | |
2473 | .rpc_call_done = nfs4_renew_done, | |
2474 | }; | |
2475 | ||
2476 | int nfs4_proc_async_renew(struct nfs4_client *clp, struct rpc_cred *cred) | |
2477 | { | |
2478 | struct rpc_message msg = { | |
2479 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], | |
2480 | .rpc_argp = clp, | |
2481 | .rpc_cred = cred, | |
2482 | }; | |
2483 | ||
2484 | return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT, | |
2485 | &nfs4_renew_ops, (void *)jiffies); | |
2486 | } | |
2487 | ||
2488 | int nfs4_proc_renew(struct nfs4_client *clp, struct rpc_cred *cred) | |
2489 | { | |
2490 | struct rpc_message msg = { | |
2491 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], | |
2492 | .rpc_argp = clp, | |
2493 | .rpc_cred = cred, | |
2494 | }; | |
2495 | unsigned long now = jiffies; | |
2496 | int status; | |
2497 | ||
2498 | status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); | |
2499 | if (status < 0) | |
2500 | return status; | |
2501 | spin_lock(&clp->cl_lock); | |
2502 | if (time_before(clp->cl_last_renewal,now)) | |
2503 | clp->cl_last_renewal = now; | |
2504 | spin_unlock(&clp->cl_lock); | |
2505 | return 0; | |
2506 | } | |
2507 | ||
2508 | static inline int nfs4_server_supports_acls(struct nfs_server *server) | |
2509 | { | |
2510 | return (server->caps & NFS_CAP_ACLS) | |
2511 | && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) | |
2512 | && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL); | |
2513 | } | |
2514 | ||
2515 | /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that | |
2516 | * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on | |
2517 | * the stack. | |
2518 | */ | |
2519 | #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT) | |
2520 | ||
2521 | static void buf_to_pages(const void *buf, size_t buflen, | |
2522 | struct page **pages, unsigned int *pgbase) | |
2523 | { | |
2524 | const void *p = buf; | |
2525 | ||
2526 | *pgbase = offset_in_page(buf); | |
2527 | p -= *pgbase; | |
2528 | while (p < buf + buflen) { | |
2529 | *(pages++) = virt_to_page(p); | |
2530 | p += PAGE_CACHE_SIZE; | |
2531 | } | |
2532 | } | |
2533 | ||
2534 | struct nfs4_cached_acl { | |
2535 | int cached; | |
2536 | size_t len; | |
2537 | char data[0]; | |
2538 | }; | |
2539 | ||
2540 | static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) | |
2541 | { | |
2542 | struct nfs_inode *nfsi = NFS_I(inode); | |
2543 | ||
2544 | spin_lock(&inode->i_lock); | |
2545 | kfree(nfsi->nfs4_acl); | |
2546 | nfsi->nfs4_acl = acl; | |
2547 | spin_unlock(&inode->i_lock); | |
2548 | } | |
2549 | ||
2550 | static void nfs4_zap_acl_attr(struct inode *inode) | |
2551 | { | |
2552 | nfs4_set_cached_acl(inode, NULL); | |
2553 | } | |
2554 | ||
2555 | static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) | |
2556 | { | |
2557 | struct nfs_inode *nfsi = NFS_I(inode); | |
2558 | struct nfs4_cached_acl *acl; | |
2559 | int ret = -ENOENT; | |
2560 | ||
2561 | spin_lock(&inode->i_lock); | |
2562 | acl = nfsi->nfs4_acl; | |
2563 | if (acl == NULL) | |
2564 | goto out; | |
2565 | if (buf == NULL) /* user is just asking for length */ | |
2566 | goto out_len; | |
2567 | if (acl->cached == 0) | |
2568 | goto out; | |
2569 | ret = -ERANGE; /* see getxattr(2) man page */ | |
2570 | if (acl->len > buflen) | |
2571 | goto out; | |
2572 | memcpy(buf, acl->data, acl->len); | |
2573 | out_len: | |
2574 | ret = acl->len; | |
2575 | out: | |
2576 | spin_unlock(&inode->i_lock); | |
2577 | return ret; | |
2578 | } | |
2579 | ||
2580 | static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len) | |
2581 | { | |
2582 | struct nfs4_cached_acl *acl; | |
2583 | ||
2584 | if (buf && acl_len <= PAGE_SIZE) { | |
2585 | acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL); | |
2586 | if (acl == NULL) | |
2587 | goto out; | |
2588 | acl->cached = 1; | |
2589 | memcpy(acl->data, buf, acl_len); | |
2590 | } else { | |
2591 | acl = kmalloc(sizeof(*acl), GFP_KERNEL); | |
2592 | if (acl == NULL) | |
2593 | goto out; | |
2594 | acl->cached = 0; | |
2595 | } | |
2596 | acl->len = acl_len; | |
2597 | out: | |
2598 | nfs4_set_cached_acl(inode, acl); | |
2599 | } | |
2600 | ||
2601 | static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) | |
2602 | { | |
2603 | struct page *pages[NFS4ACL_MAXPAGES]; | |
2604 | struct nfs_getaclargs args = { | |
2605 | .fh = NFS_FH(inode), | |
2606 | .acl_pages = pages, | |
2607 | .acl_len = buflen, | |
2608 | }; | |
2609 | size_t resp_len = buflen; | |
2610 | void *resp_buf; | |
2611 | struct rpc_message msg = { | |
2612 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], | |
2613 | .rpc_argp = &args, | |
2614 | .rpc_resp = &resp_len, | |
2615 | }; | |
2616 | struct page *localpage = NULL; | |
2617 | int ret; | |
2618 | ||
2619 | if (buflen < PAGE_SIZE) { | |
2620 | /* As long as we're doing a round trip to the server anyway, | |
2621 | * let's be prepared for a page of acl data. */ | |
2622 | localpage = alloc_page(GFP_KERNEL); | |
2623 | resp_buf = page_address(localpage); | |
2624 | if (localpage == NULL) | |
2625 | return -ENOMEM; | |
2626 | args.acl_pages[0] = localpage; | |
2627 | args.acl_pgbase = 0; | |
2628 | resp_len = args.acl_len = PAGE_SIZE; | |
2629 | } else { | |
2630 | resp_buf = buf; | |
2631 | buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase); | |
2632 | } | |
2633 | ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); | |
2634 | if (ret) | |
2635 | goto out_free; | |
2636 | if (resp_len > args.acl_len) | |
2637 | nfs4_write_cached_acl(inode, NULL, resp_len); | |
2638 | else | |
2639 | nfs4_write_cached_acl(inode, resp_buf, resp_len); | |
2640 | if (buf) { | |
2641 | ret = -ERANGE; | |
2642 | if (resp_len > buflen) | |
2643 | goto out_free; | |
2644 | if (localpage) | |
2645 | memcpy(buf, resp_buf, resp_len); | |
2646 | } | |
2647 | ret = resp_len; | |
2648 | out_free: | |
2649 | if (localpage) | |
2650 | __free_page(localpage); | |
2651 | return ret; | |
2652 | } | |
2653 | ||
2654 | static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) | |
2655 | { | |
2656 | struct nfs_server *server = NFS_SERVER(inode); | |
2657 | int ret; | |
2658 | ||
2659 | if (!nfs4_server_supports_acls(server)) | |
2660 | return -EOPNOTSUPP; | |
2661 | ret = nfs_revalidate_inode(server, inode); | |
2662 | if (ret < 0) | |
2663 | return ret; | |
2664 | ret = nfs4_read_cached_acl(inode, buf, buflen); | |
2665 | if (ret != -ENOENT) | |
2666 | return ret; | |
2667 | return nfs4_get_acl_uncached(inode, buf, buflen); | |
2668 | } | |
2669 | ||
2670 | static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) | |
2671 | { | |
2672 | struct nfs_server *server = NFS_SERVER(inode); | |
2673 | struct page *pages[NFS4ACL_MAXPAGES]; | |
2674 | struct nfs_setaclargs arg = { | |
2675 | .fh = NFS_FH(inode), | |
2676 | .acl_pages = pages, | |
2677 | .acl_len = buflen, | |
2678 | }; | |
2679 | struct rpc_message msg = { | |
2680 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], | |
2681 | .rpc_argp = &arg, | |
2682 | .rpc_resp = NULL, | |
2683 | }; | |
2684 | int ret; | |
2685 | ||
2686 | if (!nfs4_server_supports_acls(server)) | |
2687 | return -EOPNOTSUPP; | |
2688 | nfs_inode_return_delegation(inode); | |
2689 | buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase); | |
2690 | ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0); | |
2691 | if (ret == 0) | |
2692 | nfs4_write_cached_acl(inode, buf, buflen); | |
2693 | return ret; | |
2694 | } | |
2695 | ||
2696 | static int | |
2697 | nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server) | |
2698 | { | |
2699 | struct nfs4_client *clp = server->nfs4_state; | |
2700 | ||
2701 | if (!clp || task->tk_status >= 0) | |
2702 | return 0; | |
2703 | switch(task->tk_status) { | |
2704 | case -NFS4ERR_STALE_CLIENTID: | |
2705 | case -NFS4ERR_STALE_STATEID: | |
2706 | case -NFS4ERR_EXPIRED: | |
2707 | rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL); | |
2708 | nfs4_schedule_state_recovery(clp); | |
2709 | if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0) | |
2710 | rpc_wake_up_task(task); | |
2711 | task->tk_status = 0; | |
2712 | return -EAGAIN; | |
2713 | case -NFS4ERR_DELAY: | |
2714 | nfs_inc_server_stats((struct nfs_server *) server, | |
2715 | NFSIOS_DELAY); | |
2716 | case -NFS4ERR_GRACE: | |
2717 | rpc_delay(task, NFS4_POLL_RETRY_MAX); | |
2718 | task->tk_status = 0; | |
2719 | return -EAGAIN; | |
2720 | case -NFS4ERR_OLD_STATEID: | |
2721 | task->tk_status = 0; | |
2722 | return -EAGAIN; | |
2723 | } | |
2724 | task->tk_status = nfs4_map_errors(task->tk_status); | |
2725 | return 0; | |
2726 | } | |
2727 | ||
2728 | static int nfs4_wait_bit_interruptible(void *word) | |
2729 | { | |
2730 | if (signal_pending(current)) | |
2731 | return -ERESTARTSYS; | |
2732 | schedule(); | |
2733 | return 0; | |
2734 | } | |
2735 | ||
2736 | static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp) | |
2737 | { | |
2738 | sigset_t oldset; | |
2739 | int res; | |
2740 | ||
2741 | might_sleep(); | |
2742 | ||
2743 | rpc_clnt_sigmask(clnt, &oldset); | |
2744 | res = wait_on_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER, | |
2745 | nfs4_wait_bit_interruptible, | |
2746 | TASK_INTERRUPTIBLE); | |
2747 | rpc_clnt_sigunmask(clnt, &oldset); | |
2748 | return res; | |
2749 | } | |
2750 | ||
2751 | static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) | |
2752 | { | |
2753 | sigset_t oldset; | |
2754 | int res = 0; | |
2755 | ||
2756 | might_sleep(); | |
2757 | ||
2758 | if (*timeout <= 0) | |
2759 | *timeout = NFS4_POLL_RETRY_MIN; | |
2760 | if (*timeout > NFS4_POLL_RETRY_MAX) | |
2761 | *timeout = NFS4_POLL_RETRY_MAX; | |
2762 | rpc_clnt_sigmask(clnt, &oldset); | |
2763 | if (clnt->cl_intr) { | |
2764 | schedule_timeout_interruptible(*timeout); | |
2765 | if (signalled()) | |
2766 | res = -ERESTARTSYS; | |
2767 | } else | |
2768 | schedule_timeout_uninterruptible(*timeout); | |
2769 | rpc_clnt_sigunmask(clnt, &oldset); | |
2770 | *timeout <<= 1; | |
2771 | return res; | |
2772 | } | |
2773 | ||
2774 | /* This is the error handling routine for processes that are allowed | |
2775 | * to sleep. | |
2776 | */ | |
2777 | int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception) | |
2778 | { | |
2779 | struct nfs4_client *clp = server->nfs4_state; | |
2780 | int ret = errorcode; | |
2781 | ||
2782 | exception->retry = 0; | |
2783 | switch(errorcode) { | |
2784 | case 0: | |
2785 | return 0; | |
2786 | case -NFS4ERR_STALE_CLIENTID: | |
2787 | case -NFS4ERR_STALE_STATEID: | |
2788 | case -NFS4ERR_EXPIRED: | |
2789 | nfs4_schedule_state_recovery(clp); | |
2790 | ret = nfs4_wait_clnt_recover(server->client, clp); | |
2791 | if (ret == 0) | |
2792 | exception->retry = 1; | |
2793 | break; | |
2794 | case -NFS4ERR_GRACE: | |
2795 | case -NFS4ERR_DELAY: | |
2796 | ret = nfs4_delay(server->client, &exception->timeout); | |
2797 | if (ret != 0) | |
2798 | break; | |
2799 | case -NFS4ERR_OLD_STATEID: | |
2800 | exception->retry = 1; | |
2801 | } | |
2802 | /* We failed to handle the error */ | |
2803 | return nfs4_map_errors(ret); | |
2804 | } | |
2805 | ||
2806 | int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port, struct rpc_cred *cred) | |
2807 | { | |
2808 | nfs4_verifier sc_verifier; | |
2809 | struct nfs4_setclientid setclientid = { | |
2810 | .sc_verifier = &sc_verifier, | |
2811 | .sc_prog = program, | |
2812 | }; | |
2813 | struct rpc_message msg = { | |
2814 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], | |
2815 | .rpc_argp = &setclientid, | |
2816 | .rpc_resp = clp, | |
2817 | .rpc_cred = cred, | |
2818 | }; | |
2819 | u32 *p; | |
2820 | int loop = 0; | |
2821 | int status; | |
2822 | ||
2823 | p = (u32*)sc_verifier.data; | |
2824 | *p++ = htonl((u32)clp->cl_boot_time.tv_sec); | |
2825 | *p = htonl((u32)clp->cl_boot_time.tv_nsec); | |
2826 | ||
2827 | for(;;) { | |
2828 | setclientid.sc_name_len = scnprintf(setclientid.sc_name, | |
2829 | sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u", | |
2830 | clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr), | |
2831 | cred->cr_ops->cr_name, | |
2832 | clp->cl_id_uniquifier); | |
2833 | setclientid.sc_netid_len = scnprintf(setclientid.sc_netid, | |
2834 | sizeof(setclientid.sc_netid), "tcp"); | |
2835 | setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, | |
2836 | sizeof(setclientid.sc_uaddr), "%s.%d.%d", | |
2837 | clp->cl_ipaddr, port >> 8, port & 255); | |
2838 | ||
2839 | status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); | |
2840 | if (status != -NFS4ERR_CLID_INUSE) | |
2841 | break; | |
2842 | if (signalled()) | |
2843 | break; | |
2844 | if (loop++ & 1) | |
2845 | ssleep(clp->cl_lease_time + 1); | |
2846 | else | |
2847 | if (++clp->cl_id_uniquifier == 0) | |
2848 | break; | |
2849 | } | |
2850 | return status; | |
2851 | } | |
2852 | ||
2853 | int | |
2854 | nfs4_proc_setclientid_confirm(struct nfs4_client *clp, struct rpc_cred *cred) | |
2855 | { | |
2856 | struct nfs_fsinfo fsinfo; | |
2857 | struct rpc_message msg = { | |
2858 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], | |
2859 | .rpc_argp = clp, | |
2860 | .rpc_resp = &fsinfo, | |
2861 | .rpc_cred = cred, | |
2862 | }; | |
2863 | unsigned long now; | |
2864 | int status; | |
2865 | ||
2866 | now = jiffies; | |
2867 | status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); | |
2868 | if (status == 0) { | |
2869 | spin_lock(&clp->cl_lock); | |
2870 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
2871 | clp->cl_last_renewal = now; | |
2872 | clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); | |
2873 | spin_unlock(&clp->cl_lock); | |
2874 | } | |
2875 | return status; | |
2876 | } | |
2877 | ||
2878 | struct nfs4_delegreturndata { | |
2879 | struct nfs4_delegreturnargs args; | |
2880 | struct nfs4_delegreturnres res; | |
2881 | struct nfs_fh fh; | |
2882 | nfs4_stateid stateid; | |
2883 | struct rpc_cred *cred; | |
2884 | unsigned long timestamp; | |
2885 | struct nfs_fattr fattr; | |
2886 | int rpc_status; | |
2887 | }; | |
2888 | ||
2889 | static void nfs4_delegreturn_prepare(struct rpc_task *task, void *calldata) | |
2890 | { | |
2891 | struct nfs4_delegreturndata *data = calldata; | |
2892 | struct rpc_message msg = { | |
2893 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], | |
2894 | .rpc_argp = &data->args, | |
2895 | .rpc_resp = &data->res, | |
2896 | .rpc_cred = data->cred, | |
2897 | }; | |
2898 | nfs_fattr_init(data->res.fattr); | |
2899 | rpc_call_setup(task, &msg, 0); | |
2900 | } | |
2901 | ||
2902 | static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata) | |
2903 | { | |
2904 | struct nfs4_delegreturndata *data = calldata; | |
2905 | data->rpc_status = task->tk_status; | |
2906 | if (data->rpc_status == 0) | |
2907 | renew_lease(data->res.server, data->timestamp); | |
2908 | } | |
2909 | ||
2910 | static void nfs4_delegreturn_release(void *calldata) | |
2911 | { | |
2912 | struct nfs4_delegreturndata *data = calldata; | |
2913 | ||
2914 | put_rpccred(data->cred); | |
2915 | kfree(calldata); | |
2916 | } | |
2917 | ||
2918 | static const struct rpc_call_ops nfs4_delegreturn_ops = { | |
2919 | .rpc_call_prepare = nfs4_delegreturn_prepare, | |
2920 | .rpc_call_done = nfs4_delegreturn_done, | |
2921 | .rpc_release = nfs4_delegreturn_release, | |
2922 | }; | |
2923 | ||
2924 | static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid) | |
2925 | { | |
2926 | struct nfs4_delegreturndata *data; | |
2927 | struct nfs_server *server = NFS_SERVER(inode); | |
2928 | struct rpc_task *task; | |
2929 | int status; | |
2930 | ||
2931 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
2932 | if (data == NULL) | |
2933 | return -ENOMEM; | |
2934 | data->args.fhandle = &data->fh; | |
2935 | data->args.stateid = &data->stateid; | |
2936 | data->args.bitmask = server->attr_bitmask; | |
2937 | nfs_copy_fh(&data->fh, NFS_FH(inode)); | |
2938 | memcpy(&data->stateid, stateid, sizeof(data->stateid)); | |
2939 | data->res.fattr = &data->fattr; | |
2940 | data->res.server = server; | |
2941 | data->cred = get_rpccred(cred); | |
2942 | data->timestamp = jiffies; | |
2943 | data->rpc_status = 0; | |
2944 | ||
2945 | task = rpc_run_task(NFS_CLIENT(inode), RPC_TASK_ASYNC, &nfs4_delegreturn_ops, data); | |
2946 | if (IS_ERR(task)) { | |
2947 | nfs4_delegreturn_release(data); | |
2948 | return PTR_ERR(task); | |
2949 | } | |
2950 | status = nfs4_wait_for_completion_rpc_task(task); | |
2951 | if (status == 0) { | |
2952 | status = data->rpc_status; | |
2953 | if (status == 0) | |
2954 | nfs_post_op_update_inode(inode, &data->fattr); | |
2955 | } | |
2956 | rpc_release_task(task); | |
2957 | return status; | |
2958 | } | |
2959 | ||
2960 | int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid) | |
2961 | { | |
2962 | struct nfs_server *server = NFS_SERVER(inode); | |
2963 | struct nfs4_exception exception = { }; | |
2964 | int err; | |
2965 | do { | |
2966 | err = _nfs4_proc_delegreturn(inode, cred, stateid); | |
2967 | switch (err) { | |
2968 | case -NFS4ERR_STALE_STATEID: | |
2969 | case -NFS4ERR_EXPIRED: | |
2970 | nfs4_schedule_state_recovery(server->nfs4_state); | |
2971 | case 0: | |
2972 | return 0; | |
2973 | } | |
2974 | err = nfs4_handle_exception(server, err, &exception); | |
2975 | } while (exception.retry); | |
2976 | return err; | |
2977 | } | |
2978 | ||
2979 | #define NFS4_LOCK_MINTIMEOUT (1 * HZ) | |
2980 | #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) | |
2981 | ||
2982 | /* | |
2983 | * sleep, with exponential backoff, and retry the LOCK operation. | |
2984 | */ | |
2985 | static unsigned long | |
2986 | nfs4_set_lock_task_retry(unsigned long timeout) | |
2987 | { | |
2988 | schedule_timeout_interruptible(timeout); | |
2989 | timeout <<= 1; | |
2990 | if (timeout > NFS4_LOCK_MAXTIMEOUT) | |
2991 | return NFS4_LOCK_MAXTIMEOUT; | |
2992 | return timeout; | |
2993 | } | |
2994 | ||
2995 | static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) | |
2996 | { | |
2997 | struct inode *inode = state->inode; | |
2998 | struct nfs_server *server = NFS_SERVER(inode); | |
2999 | struct nfs4_client *clp = server->nfs4_state; | |
3000 | struct nfs_lockt_args arg = { | |
3001 | .fh = NFS_FH(inode), | |
3002 | .fl = request, | |
3003 | }; | |
3004 | struct nfs_lockt_res res = { | |
3005 | .denied = request, | |
3006 | }; | |
3007 | struct rpc_message msg = { | |
3008 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], | |
3009 | .rpc_argp = &arg, | |
3010 | .rpc_resp = &res, | |
3011 | .rpc_cred = state->owner->so_cred, | |
3012 | }; | |
3013 | struct nfs4_lock_state *lsp; | |
3014 | int status; | |
3015 | ||
3016 | down_read(&clp->cl_sem); | |
3017 | arg.lock_owner.clientid = clp->cl_clientid; | |
3018 | status = nfs4_set_lock_state(state, request); | |
3019 | if (status != 0) | |
3020 | goto out; | |
3021 | lsp = request->fl_u.nfs4_fl.owner; | |
3022 | arg.lock_owner.id = lsp->ls_id; | |
3023 | status = rpc_call_sync(server->client, &msg, 0); | |
3024 | switch (status) { | |
3025 | case 0: | |
3026 | request->fl_type = F_UNLCK; | |
3027 | break; | |
3028 | case -NFS4ERR_DENIED: | |
3029 | status = 0; | |
3030 | } | |
3031 | out: | |
3032 | up_read(&clp->cl_sem); | |
3033 | return status; | |
3034 | } | |
3035 | ||
3036 | static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) | |
3037 | { | |
3038 | struct nfs4_exception exception = { }; | |
3039 | int err; | |
3040 | ||
3041 | do { | |
3042 | err = nfs4_handle_exception(NFS_SERVER(state->inode), | |
3043 | _nfs4_proc_getlk(state, cmd, request), | |
3044 | &exception); | |
3045 | } while (exception.retry); | |
3046 | return err; | |
3047 | } | |
3048 | ||
3049 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
3050 | { | |
3051 | int res = 0; | |
3052 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
3053 | case FL_POSIX: | |
3054 | res = posix_lock_file_wait(file, fl); | |
3055 | break; | |
3056 | case FL_FLOCK: | |
3057 | res = flock_lock_file_wait(file, fl); | |
3058 | break; | |
3059 | default: | |
3060 | BUG(); | |
3061 | } | |
3062 | if (res < 0) | |
3063 | printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", | |
3064 | __FUNCTION__); | |
3065 | return res; | |
3066 | } | |
3067 | ||
3068 | struct nfs4_unlockdata { | |
3069 | struct nfs_locku_args arg; | |
3070 | struct nfs_locku_res res; | |
3071 | struct nfs4_lock_state *lsp; | |
3072 | struct nfs_open_context *ctx; | |
3073 | struct file_lock fl; | |
3074 | const struct nfs_server *server; | |
3075 | unsigned long timestamp; | |
3076 | }; | |
3077 | ||
3078 | static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl, | |
3079 | struct nfs_open_context *ctx, | |
3080 | struct nfs4_lock_state *lsp, | |
3081 | struct nfs_seqid *seqid) | |
3082 | { | |
3083 | struct nfs4_unlockdata *p; | |
3084 | struct inode *inode = lsp->ls_state->inode; | |
3085 | ||
3086 | p = kmalloc(sizeof(*p), GFP_KERNEL); | |
3087 | if (p == NULL) | |
3088 | return NULL; | |
3089 | p->arg.fh = NFS_FH(inode); | |
3090 | p->arg.fl = &p->fl; | |
3091 | p->arg.seqid = seqid; | |
3092 | p->arg.stateid = &lsp->ls_stateid; | |
3093 | p->lsp = lsp; | |
3094 | atomic_inc(&lsp->ls_count); | |
3095 | /* Ensure we don't close file until we're done freeing locks! */ | |
3096 | p->ctx = get_nfs_open_context(ctx); | |
3097 | memcpy(&p->fl, fl, sizeof(p->fl)); | |
3098 | p->server = NFS_SERVER(inode); | |
3099 | return p; | |
3100 | } | |
3101 | ||
3102 | static void nfs4_locku_release_calldata(void *data) | |
3103 | { | |
3104 | struct nfs4_unlockdata *calldata = data; | |
3105 | nfs_free_seqid(calldata->arg.seqid); | |
3106 | nfs4_put_lock_state(calldata->lsp); | |
3107 | put_nfs_open_context(calldata->ctx); | |
3108 | kfree(calldata); | |
3109 | } | |
3110 | ||
3111 | static void nfs4_locku_done(struct rpc_task *task, void *data) | |
3112 | { | |
3113 | struct nfs4_unlockdata *calldata = data; | |
3114 | ||
3115 | if (RPC_ASSASSINATED(task)) | |
3116 | return; | |
3117 | nfs_increment_lock_seqid(task->tk_status, calldata->arg.seqid); | |
3118 | switch (task->tk_status) { | |
3119 | case 0: | |
3120 | memcpy(calldata->lsp->ls_stateid.data, | |
3121 | calldata->res.stateid.data, | |
3122 | sizeof(calldata->lsp->ls_stateid.data)); | |
3123 | renew_lease(calldata->server, calldata->timestamp); | |
3124 | break; | |
3125 | case -NFS4ERR_STALE_STATEID: | |
3126 | case -NFS4ERR_EXPIRED: | |
3127 | nfs4_schedule_state_recovery(calldata->server->nfs4_state); | |
3128 | break; | |
3129 | default: | |
3130 | if (nfs4_async_handle_error(task, calldata->server) == -EAGAIN) { | |
3131 | rpc_restart_call(task); | |
3132 | } | |
3133 | } | |
3134 | } | |
3135 | ||
3136 | static void nfs4_locku_prepare(struct rpc_task *task, void *data) | |
3137 | { | |
3138 | struct nfs4_unlockdata *calldata = data; | |
3139 | struct rpc_message msg = { | |
3140 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], | |
3141 | .rpc_argp = &calldata->arg, | |
3142 | .rpc_resp = &calldata->res, | |
3143 | .rpc_cred = calldata->lsp->ls_state->owner->so_cred, | |
3144 | }; | |
3145 | ||
3146 | if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0) | |
3147 | return; | |
3148 | if ((calldata->lsp->ls_flags & NFS_LOCK_INITIALIZED) == 0) { | |
3149 | /* Note: exit _without_ running nfs4_locku_done */ | |
3150 | task->tk_action = NULL; | |
3151 | return; | |
3152 | } | |
3153 | calldata->timestamp = jiffies; | |
3154 | rpc_call_setup(task, &msg, 0); | |
3155 | } | |
3156 | ||
3157 | static const struct rpc_call_ops nfs4_locku_ops = { | |
3158 | .rpc_call_prepare = nfs4_locku_prepare, | |
3159 | .rpc_call_done = nfs4_locku_done, | |
3160 | .rpc_release = nfs4_locku_release_calldata, | |
3161 | }; | |
3162 | ||
3163 | static struct rpc_task *nfs4_do_unlck(struct file_lock *fl, | |
3164 | struct nfs_open_context *ctx, | |
3165 | struct nfs4_lock_state *lsp, | |
3166 | struct nfs_seqid *seqid) | |
3167 | { | |
3168 | struct nfs4_unlockdata *data; | |
3169 | struct rpc_task *task; | |
3170 | ||
3171 | data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid); | |
3172 | if (data == NULL) { | |
3173 | nfs_free_seqid(seqid); | |
3174 | return ERR_PTR(-ENOMEM); | |
3175 | } | |
3176 | ||
3177 | /* Unlock _before_ we do the RPC call */ | |
3178 | do_vfs_lock(fl->fl_file, fl); | |
3179 | task = rpc_run_task(NFS_CLIENT(lsp->ls_state->inode), RPC_TASK_ASYNC, &nfs4_locku_ops, data); | |
3180 | if (IS_ERR(task)) | |
3181 | nfs4_locku_release_calldata(data); | |
3182 | return task; | |
3183 | } | |
3184 | ||
3185 | static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) | |
3186 | { | |
3187 | struct nfs_seqid *seqid; | |
3188 | struct nfs4_lock_state *lsp; | |
3189 | struct rpc_task *task; | |
3190 | int status = 0; | |
3191 | ||
3192 | /* Is this a delegated lock? */ | |
3193 | if (test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
3194 | goto out_unlock; | |
3195 | /* Is this open_owner holding any locks on the server? */ | |
3196 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) | |
3197 | goto out_unlock; | |
3198 | ||
3199 | status = nfs4_set_lock_state(state, request); | |
3200 | if (status != 0) | |
3201 | goto out_unlock; | |
3202 | lsp = request->fl_u.nfs4_fl.owner; | |
3203 | status = -ENOMEM; | |
3204 | seqid = nfs_alloc_seqid(&lsp->ls_seqid); | |
3205 | if (seqid == NULL) | |
3206 | goto out_unlock; | |
3207 | task = nfs4_do_unlck(request, request->fl_file->private_data, lsp, seqid); | |
3208 | status = PTR_ERR(task); | |
3209 | if (IS_ERR(task)) | |
3210 | goto out_unlock; | |
3211 | status = nfs4_wait_for_completion_rpc_task(task); | |
3212 | rpc_release_task(task); | |
3213 | return status; | |
3214 | out_unlock: | |
3215 | do_vfs_lock(request->fl_file, request); | |
3216 | return status; | |
3217 | } | |
3218 | ||
3219 | struct nfs4_lockdata { | |
3220 | struct nfs_lock_args arg; | |
3221 | struct nfs_lock_res res; | |
3222 | struct nfs4_lock_state *lsp; | |
3223 | struct nfs_open_context *ctx; | |
3224 | struct file_lock fl; | |
3225 | unsigned long timestamp; | |
3226 | int rpc_status; | |
3227 | int cancelled; | |
3228 | }; | |
3229 | ||
3230 | static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl, | |
3231 | struct nfs_open_context *ctx, struct nfs4_lock_state *lsp) | |
3232 | { | |
3233 | struct nfs4_lockdata *p; | |
3234 | struct inode *inode = lsp->ls_state->inode; | |
3235 | struct nfs_server *server = NFS_SERVER(inode); | |
3236 | ||
3237 | p = kzalloc(sizeof(*p), GFP_KERNEL); | |
3238 | if (p == NULL) | |
3239 | return NULL; | |
3240 | ||
3241 | p->arg.fh = NFS_FH(inode); | |
3242 | p->arg.fl = &p->fl; | |
3243 | p->arg.lock_seqid = nfs_alloc_seqid(&lsp->ls_seqid); | |
3244 | if (p->arg.lock_seqid == NULL) | |
3245 | goto out_free; | |
3246 | p->arg.lock_stateid = &lsp->ls_stateid; | |
3247 | p->arg.lock_owner.clientid = server->nfs4_state->cl_clientid; | |
3248 | p->arg.lock_owner.id = lsp->ls_id; | |
3249 | p->lsp = lsp; | |
3250 | atomic_inc(&lsp->ls_count); | |
3251 | p->ctx = get_nfs_open_context(ctx); | |
3252 | memcpy(&p->fl, fl, sizeof(p->fl)); | |
3253 | return p; | |
3254 | out_free: | |
3255 | kfree(p); | |
3256 | return NULL; | |
3257 | } | |
3258 | ||
3259 | static void nfs4_lock_prepare(struct rpc_task *task, void *calldata) | |
3260 | { | |
3261 | struct nfs4_lockdata *data = calldata; | |
3262 | struct nfs4_state *state = data->lsp->ls_state; | |
3263 | struct nfs4_state_owner *sp = state->owner; | |
3264 | struct rpc_message msg = { | |
3265 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], | |
3266 | .rpc_argp = &data->arg, | |
3267 | .rpc_resp = &data->res, | |
3268 | .rpc_cred = sp->so_cred, | |
3269 | }; | |
3270 | ||
3271 | if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0) | |
3272 | return; | |
3273 | dprintk("%s: begin!\n", __FUNCTION__); | |
3274 | /* Do we need to do an open_to_lock_owner? */ | |
3275 | if (!(data->arg.lock_seqid->sequence->flags & NFS_SEQID_CONFIRMED)) { | |
3276 | data->arg.open_seqid = nfs_alloc_seqid(&sp->so_seqid); | |
3277 | if (data->arg.open_seqid == NULL) { | |
3278 | data->rpc_status = -ENOMEM; | |
3279 | task->tk_action = NULL; | |
3280 | goto out; | |
3281 | } | |
3282 | data->arg.open_stateid = &state->stateid; | |
3283 | data->arg.new_lock_owner = 1; | |
3284 | } | |
3285 | data->timestamp = jiffies; | |
3286 | rpc_call_setup(task, &msg, 0); | |
3287 | out: | |
3288 | dprintk("%s: done!, ret = %d\n", __FUNCTION__, data->rpc_status); | |
3289 | } | |
3290 | ||
3291 | static void nfs4_lock_done(struct rpc_task *task, void *calldata) | |
3292 | { | |
3293 | struct nfs4_lockdata *data = calldata; | |
3294 | ||
3295 | dprintk("%s: begin!\n", __FUNCTION__); | |
3296 | ||
3297 | data->rpc_status = task->tk_status; | |
3298 | if (RPC_ASSASSINATED(task)) | |
3299 | goto out; | |
3300 | if (data->arg.new_lock_owner != 0) { | |
3301 | nfs_increment_open_seqid(data->rpc_status, data->arg.open_seqid); | |
3302 | if (data->rpc_status == 0) | |
3303 | nfs_confirm_seqid(&data->lsp->ls_seqid, 0); | |
3304 | else | |
3305 | goto out; | |
3306 | } | |
3307 | if (data->rpc_status == 0) { | |
3308 | memcpy(data->lsp->ls_stateid.data, data->res.stateid.data, | |
3309 | sizeof(data->lsp->ls_stateid.data)); | |
3310 | data->lsp->ls_flags |= NFS_LOCK_INITIALIZED; | |
3311 | renew_lease(NFS_SERVER(data->ctx->dentry->d_inode), data->timestamp); | |
3312 | } | |
3313 | nfs_increment_lock_seqid(data->rpc_status, data->arg.lock_seqid); | |
3314 | out: | |
3315 | dprintk("%s: done, ret = %d!\n", __FUNCTION__, data->rpc_status); | |
3316 | } | |
3317 | ||
3318 | static void nfs4_lock_release(void *calldata) | |
3319 | { | |
3320 | struct nfs4_lockdata *data = calldata; | |
3321 | ||
3322 | dprintk("%s: begin!\n", __FUNCTION__); | |
3323 | if (data->arg.open_seqid != NULL) | |
3324 | nfs_free_seqid(data->arg.open_seqid); | |
3325 | if (data->cancelled != 0) { | |
3326 | struct rpc_task *task; | |
3327 | task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp, | |
3328 | data->arg.lock_seqid); | |
3329 | if (!IS_ERR(task)) | |
3330 | rpc_release_task(task); | |
3331 | dprintk("%s: cancelling lock!\n", __FUNCTION__); | |
3332 | } else | |
3333 | nfs_free_seqid(data->arg.lock_seqid); | |
3334 | nfs4_put_lock_state(data->lsp); | |
3335 | put_nfs_open_context(data->ctx); | |
3336 | kfree(data); | |
3337 | dprintk("%s: done!\n", __FUNCTION__); | |
3338 | } | |
3339 | ||
3340 | static const struct rpc_call_ops nfs4_lock_ops = { | |
3341 | .rpc_call_prepare = nfs4_lock_prepare, | |
3342 | .rpc_call_done = nfs4_lock_done, | |
3343 | .rpc_release = nfs4_lock_release, | |
3344 | }; | |
3345 | ||
3346 | static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int reclaim) | |
3347 | { | |
3348 | struct nfs4_lockdata *data; | |
3349 | struct rpc_task *task; | |
3350 | int ret; | |
3351 | ||
3352 | dprintk("%s: begin!\n", __FUNCTION__); | |
3353 | data = nfs4_alloc_lockdata(fl, fl->fl_file->private_data, | |
3354 | fl->fl_u.nfs4_fl.owner); | |
3355 | if (data == NULL) | |
3356 | return -ENOMEM; | |
3357 | if (IS_SETLKW(cmd)) | |
3358 | data->arg.block = 1; | |
3359 | if (reclaim != 0) | |
3360 | data->arg.reclaim = 1; | |
3361 | task = rpc_run_task(NFS_CLIENT(state->inode), RPC_TASK_ASYNC, | |
3362 | &nfs4_lock_ops, data); | |
3363 | if (IS_ERR(task)) { | |
3364 | nfs4_lock_release(data); | |
3365 | return PTR_ERR(task); | |
3366 | } | |
3367 | ret = nfs4_wait_for_completion_rpc_task(task); | |
3368 | if (ret == 0) { | |
3369 | ret = data->rpc_status; | |
3370 | if (ret == -NFS4ERR_DENIED) | |
3371 | ret = -EAGAIN; | |
3372 | } else | |
3373 | data->cancelled = 1; | |
3374 | rpc_release_task(task); | |
3375 | dprintk("%s: done, ret = %d!\n", __FUNCTION__, ret); | |
3376 | return ret; | |
3377 | } | |
3378 | ||
3379 | static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) | |
3380 | { | |
3381 | struct nfs_server *server = NFS_SERVER(state->inode); | |
3382 | struct nfs4_exception exception = { }; | |
3383 | int err; | |
3384 | ||
3385 | /* Cache the lock if possible... */ | |
3386 | if (test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
3387 | return 0; | |
3388 | do { | |
3389 | err = _nfs4_do_setlk(state, F_SETLK, request, 1); | |
3390 | if (err != -NFS4ERR_DELAY) | |
3391 | break; | |
3392 | nfs4_handle_exception(server, err, &exception); | |
3393 | } while (exception.retry); | |
3394 | return err; | |
3395 | } | |
3396 | ||
3397 | static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) | |
3398 | { | |
3399 | struct nfs_server *server = NFS_SERVER(state->inode); | |
3400 | struct nfs4_exception exception = { }; | |
3401 | int err; | |
3402 | ||
3403 | err = nfs4_set_lock_state(state, request); | |
3404 | if (err != 0) | |
3405 | return err; | |
3406 | do { | |
3407 | err = _nfs4_do_setlk(state, F_SETLK, request, 0); | |
3408 | if (err != -NFS4ERR_DELAY) | |
3409 | break; | |
3410 | nfs4_handle_exception(server, err, &exception); | |
3411 | } while (exception.retry); | |
3412 | return err; | |
3413 | } | |
3414 | ||
3415 | static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) | |
3416 | { | |
3417 | struct nfs4_client *clp = state->owner->so_client; | |
3418 | int status; | |
3419 | ||
3420 | /* Is this a delegated open? */ | |
3421 | if (NFS_I(state->inode)->delegation_state != 0) { | |
3422 | /* Yes: cache locks! */ | |
3423 | status = do_vfs_lock(request->fl_file, request); | |
3424 | /* ...but avoid races with delegation recall... */ | |
3425 | if (status < 0 || test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
3426 | return status; | |
3427 | } | |
3428 | down_read(&clp->cl_sem); | |
3429 | status = nfs4_set_lock_state(state, request); | |
3430 | if (status != 0) | |
3431 | goto out; | |
3432 | status = _nfs4_do_setlk(state, cmd, request, 0); | |
3433 | if (status != 0) | |
3434 | goto out; | |
3435 | /* Note: we always want to sleep here! */ | |
3436 | request->fl_flags |= FL_SLEEP; | |
3437 | if (do_vfs_lock(request->fl_file, request) < 0) | |
3438 | printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__); | |
3439 | out: | |
3440 | up_read(&clp->cl_sem); | |
3441 | return status; | |
3442 | } | |
3443 | ||
3444 | static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) | |
3445 | { | |
3446 | struct nfs4_exception exception = { }; | |
3447 | int err; | |
3448 | ||
3449 | do { | |
3450 | err = nfs4_handle_exception(NFS_SERVER(state->inode), | |
3451 | _nfs4_proc_setlk(state, cmd, request), | |
3452 | &exception); | |
3453 | } while (exception.retry); | |
3454 | return err; | |
3455 | } | |
3456 | ||
3457 | static int | |
3458 | nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) | |
3459 | { | |
3460 | struct nfs_open_context *ctx; | |
3461 | struct nfs4_state *state; | |
3462 | unsigned long timeout = NFS4_LOCK_MINTIMEOUT; | |
3463 | int status; | |
3464 | ||
3465 | /* verify open state */ | |
3466 | ctx = (struct nfs_open_context *)filp->private_data; | |
3467 | state = ctx->state; | |
3468 | ||
3469 | if (request->fl_start < 0 || request->fl_end < 0) | |
3470 | return -EINVAL; | |
3471 | ||
3472 | if (IS_GETLK(cmd)) | |
3473 | return nfs4_proc_getlk(state, F_GETLK, request); | |
3474 | ||
3475 | if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) | |
3476 | return -EINVAL; | |
3477 | ||
3478 | if (request->fl_type == F_UNLCK) | |
3479 | return nfs4_proc_unlck(state, cmd, request); | |
3480 | ||
3481 | do { | |
3482 | status = nfs4_proc_setlk(state, cmd, request); | |
3483 | if ((status != -EAGAIN) || IS_SETLK(cmd)) | |
3484 | break; | |
3485 | timeout = nfs4_set_lock_task_retry(timeout); | |
3486 | status = -ERESTARTSYS; | |
3487 | if (signalled()) | |
3488 | break; | |
3489 | } while(status < 0); | |
3490 | return status; | |
3491 | } | |
3492 | ||
3493 | int nfs4_lock_delegation_recall(struct nfs4_state *state, struct file_lock *fl) | |
3494 | { | |
3495 | struct nfs_server *server = NFS_SERVER(state->inode); | |
3496 | struct nfs4_exception exception = { }; | |
3497 | int err; | |
3498 | ||
3499 | err = nfs4_set_lock_state(state, fl); | |
3500 | if (err != 0) | |
3501 | goto out; | |
3502 | do { | |
3503 | err = _nfs4_do_setlk(state, F_SETLK, fl, 0); | |
3504 | if (err != -NFS4ERR_DELAY) | |
3505 | break; | |
3506 | err = nfs4_handle_exception(server, err, &exception); | |
3507 | } while (exception.retry); | |
3508 | out: | |
3509 | return err; | |
3510 | } | |
3511 | ||
3512 | #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" | |
3513 | ||
3514 | int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf, | |
3515 | size_t buflen, int flags) | |
3516 | { | |
3517 | struct inode *inode = dentry->d_inode; | |
3518 | ||
3519 | if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) | |
3520 | return -EOPNOTSUPP; | |
3521 | ||
3522 | if (!S_ISREG(inode->i_mode) && | |
3523 | (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX)) | |
3524 | return -EPERM; | |
3525 | ||
3526 | return nfs4_proc_set_acl(inode, buf, buflen); | |
3527 | } | |
3528 | ||
3529 | /* The getxattr man page suggests returning -ENODATA for unknown attributes, | |
3530 | * and that's what we'll do for e.g. user attributes that haven't been set. | |
3531 | * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported | |
3532 | * attributes in kernel-managed attribute namespaces. */ | |
3533 | ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf, | |
3534 | size_t buflen) | |
3535 | { | |
3536 | struct inode *inode = dentry->d_inode; | |
3537 | ||
3538 | if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) | |
3539 | return -EOPNOTSUPP; | |
3540 | ||
3541 | return nfs4_proc_get_acl(inode, buf, buflen); | |
3542 | } | |
3543 | ||
3544 | ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen) | |
3545 | { | |
3546 | size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1; | |
3547 | ||
3548 | if (buf && buflen < len) | |
3549 | return -ERANGE; | |
3550 | if (buf) | |
3551 | memcpy(buf, XATTR_NAME_NFSV4_ACL, len); | |
3552 | return len; | |
3553 | } | |
3554 | ||
3555 | struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = { | |
3556 | .recover_open = nfs4_open_reclaim, | |
3557 | .recover_lock = nfs4_lock_reclaim, | |
3558 | }; | |
3559 | ||
3560 | struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = { | |
3561 | .recover_open = nfs4_open_expired, | |
3562 | .recover_lock = nfs4_lock_expired, | |
3563 | }; | |
3564 | ||
3565 | static struct inode_operations nfs4_file_inode_operations = { | |
3566 | .permission = nfs_permission, | |
3567 | .getattr = nfs_getattr, | |
3568 | .setattr = nfs_setattr, | |
3569 | .getxattr = nfs4_getxattr, | |
3570 | .setxattr = nfs4_setxattr, | |
3571 | .listxattr = nfs4_listxattr, | |
3572 | }; | |
3573 | ||
3574 | struct nfs_rpc_ops nfs_v4_clientops = { | |
3575 | .version = 4, /* protocol version */ | |
3576 | .dentry_ops = &nfs4_dentry_operations, | |
3577 | .dir_inode_ops = &nfs4_dir_inode_operations, | |
3578 | .file_inode_ops = &nfs4_file_inode_operations, | |
3579 | .getroot = nfs4_proc_get_root, | |
3580 | .getattr = nfs4_proc_getattr, | |
3581 | .setattr = nfs4_proc_setattr, | |
3582 | .lookup = nfs4_proc_lookup, | |
3583 | .access = nfs4_proc_access, | |
3584 | .readlink = nfs4_proc_readlink, | |
3585 | .read = nfs4_proc_read, | |
3586 | .write = nfs4_proc_write, | |
3587 | .commit = nfs4_proc_commit, | |
3588 | .create = nfs4_proc_create, | |
3589 | .remove = nfs4_proc_remove, | |
3590 | .unlink_setup = nfs4_proc_unlink_setup, | |
3591 | .unlink_done = nfs4_proc_unlink_done, | |
3592 | .rename = nfs4_proc_rename, | |
3593 | .link = nfs4_proc_link, | |
3594 | .symlink = nfs4_proc_symlink, | |
3595 | .mkdir = nfs4_proc_mkdir, | |
3596 | .rmdir = nfs4_proc_remove, | |
3597 | .readdir = nfs4_proc_readdir, | |
3598 | .mknod = nfs4_proc_mknod, | |
3599 | .statfs = nfs4_proc_statfs, | |
3600 | .fsinfo = nfs4_proc_fsinfo, | |
3601 | .pathconf = nfs4_proc_pathconf, | |
3602 | .decode_dirent = nfs4_decode_dirent, | |
3603 | .read_setup = nfs4_proc_read_setup, | |
3604 | .read_done = nfs4_read_done, | |
3605 | .write_setup = nfs4_proc_write_setup, | |
3606 | .write_done = nfs4_write_done, | |
3607 | .commit_setup = nfs4_proc_commit_setup, | |
3608 | .commit_done = nfs4_commit_done, | |
3609 | .file_open = nfs_open, | |
3610 | .file_release = nfs_release, | |
3611 | .lock = nfs4_proc_lock, | |
3612 | .clear_acl_cache = nfs4_zap_acl_attr, | |
3613 | }; | |
3614 | ||
3615 | /* | |
3616 | * Local variables: | |
3617 | * c-basic-offset: 8 | |
3618 | * End: | |
3619 | */ |