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1da177e4 LT |
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 | ||
4ce79717 | 51 | #include "nfs4_fs.h" |
1da177e4 LT |
52 | #include "delegation.h" |
53 | ||
54 | #define NFSDBG_FACILITY NFSDBG_PROC | |
55 | ||
56 | #define NFS4_POLL_RETRY_MIN (1*HZ) | |
57 | #define NFS4_POLL_RETRY_MAX (15*HZ) | |
58 | ||
59 | static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *); | |
60 | static int nfs4_async_handle_error(struct rpc_task *, struct nfs_server *); | |
61 | static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry); | |
62 | static int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception); | |
63 | extern u32 *nfs4_decode_dirent(u32 *p, struct nfs_entry *entry, int plus); | |
64 | extern struct rpc_procinfo nfs4_procedures[]; | |
65 | ||
1da177e4 LT |
66 | /* Prevent leaks of NFSv4 errors into userland */ |
67 | int nfs4_map_errors(int err) | |
68 | { | |
69 | if (err < -1000) { | |
70 | dprintk("%s could not handle NFSv4 error %d\n", | |
71 | __FUNCTION__, -err); | |
72 | return -EIO; | |
73 | } | |
74 | return err; | |
75 | } | |
76 | ||
77 | /* | |
78 | * This is our standard bitmap for GETATTR requests. | |
79 | */ | |
80 | const u32 nfs4_fattr_bitmap[2] = { | |
81 | FATTR4_WORD0_TYPE | |
82 | | FATTR4_WORD0_CHANGE | |
83 | | FATTR4_WORD0_SIZE | |
84 | | FATTR4_WORD0_FSID | |
85 | | FATTR4_WORD0_FILEID, | |
86 | FATTR4_WORD1_MODE | |
87 | | FATTR4_WORD1_NUMLINKS | |
88 | | FATTR4_WORD1_OWNER | |
89 | | FATTR4_WORD1_OWNER_GROUP | |
90 | | FATTR4_WORD1_RAWDEV | |
91 | | FATTR4_WORD1_SPACE_USED | |
92 | | FATTR4_WORD1_TIME_ACCESS | |
93 | | FATTR4_WORD1_TIME_METADATA | |
94 | | FATTR4_WORD1_TIME_MODIFY | |
95 | }; | |
96 | ||
97 | const u32 nfs4_statfs_bitmap[2] = { | |
98 | FATTR4_WORD0_FILES_AVAIL | |
99 | | FATTR4_WORD0_FILES_FREE | |
100 | | FATTR4_WORD0_FILES_TOTAL, | |
101 | FATTR4_WORD1_SPACE_AVAIL | |
102 | | FATTR4_WORD1_SPACE_FREE | |
103 | | FATTR4_WORD1_SPACE_TOTAL | |
104 | }; | |
105 | ||
4ce79717 | 106 | const u32 nfs4_pathconf_bitmap[2] = { |
1da177e4 LT |
107 | FATTR4_WORD0_MAXLINK |
108 | | FATTR4_WORD0_MAXNAME, | |
109 | 0 | |
110 | }; | |
111 | ||
112 | const u32 nfs4_fsinfo_bitmap[2] = { FATTR4_WORD0_MAXFILESIZE | |
113 | | FATTR4_WORD0_MAXREAD | |
114 | | FATTR4_WORD0_MAXWRITE | |
115 | | FATTR4_WORD0_LEASE_TIME, | |
116 | 0 | |
117 | }; | |
118 | ||
119 | static void nfs4_setup_readdir(u64 cookie, u32 *verifier, struct dentry *dentry, | |
120 | struct nfs4_readdir_arg *readdir) | |
121 | { | |
122 | u32 *start, *p; | |
123 | ||
124 | BUG_ON(readdir->count < 80); | |
125 | if (cookie > 2) { | |
b7ef1956 | 126 | readdir->cookie = cookie; |
1da177e4 LT |
127 | memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier)); |
128 | return; | |
129 | } | |
130 | ||
131 | readdir->cookie = 0; | |
132 | memset(&readdir->verifier, 0, sizeof(readdir->verifier)); | |
133 | if (cookie == 2) | |
134 | return; | |
135 | ||
136 | /* | |
137 | * NFSv4 servers do not return entries for '.' and '..' | |
138 | * Therefore, we fake these entries here. We let '.' | |
139 | * have cookie 0 and '..' have cookie 1. Note that | |
140 | * when talking to the server, we always send cookie 0 | |
141 | * instead of 1 or 2. | |
142 | */ | |
143 | start = p = (u32 *)kmap_atomic(*readdir->pages, KM_USER0); | |
144 | ||
145 | if (cookie == 0) { | |
146 | *p++ = xdr_one; /* next */ | |
147 | *p++ = xdr_zero; /* cookie, first word */ | |
148 | *p++ = xdr_one; /* cookie, second word */ | |
149 | *p++ = xdr_one; /* entry len */ | |
150 | memcpy(p, ".\0\0\0", 4); /* entry */ | |
151 | p++; | |
152 | *p++ = xdr_one; /* bitmap length */ | |
153 | *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ | |
154 | *p++ = htonl(8); /* attribute buffer length */ | |
155 | p = xdr_encode_hyper(p, dentry->d_inode->i_ino); | |
156 | } | |
157 | ||
158 | *p++ = xdr_one; /* next */ | |
159 | *p++ = xdr_zero; /* cookie, first word */ | |
160 | *p++ = xdr_two; /* cookie, second word */ | |
161 | *p++ = xdr_two; /* entry len */ | |
162 | memcpy(p, "..\0\0", 4); /* entry */ | |
163 | p++; | |
164 | *p++ = xdr_one; /* bitmap length */ | |
165 | *p++ = htonl(FATTR4_WORD0_FILEID); /* bitmap */ | |
166 | *p++ = htonl(8); /* attribute buffer length */ | |
167 | p = xdr_encode_hyper(p, dentry->d_parent->d_inode->i_ino); | |
168 | ||
169 | readdir->pgbase = (char *)p - (char *)start; | |
170 | readdir->count -= readdir->pgbase; | |
171 | kunmap_atomic(start, KM_USER0); | |
172 | } | |
173 | ||
174 | static void | |
175 | renew_lease(struct nfs_server *server, unsigned long timestamp) | |
176 | { | |
177 | struct nfs4_client *clp = server->nfs4_state; | |
178 | spin_lock(&clp->cl_lock); | |
179 | if (time_before(clp->cl_last_renewal,timestamp)) | |
180 | clp->cl_last_renewal = timestamp; | |
181 | spin_unlock(&clp->cl_lock); | |
182 | } | |
183 | ||
184 | static void update_changeattr(struct inode *inode, struct nfs4_change_info *cinfo) | |
185 | { | |
186 | struct nfs_inode *nfsi = NFS_I(inode); | |
187 | ||
188 | if (cinfo->before == nfsi->change_attr && cinfo->atomic) | |
189 | nfsi->change_attr = cinfo->after; | |
190 | } | |
191 | ||
192 | static void update_open_stateid(struct nfs4_state *state, nfs4_stateid *stateid, int open_flags) | |
193 | { | |
194 | struct inode *inode = state->inode; | |
195 | ||
196 | open_flags &= (FMODE_READ|FMODE_WRITE); | |
197 | /* Protect against nfs4_find_state() */ | |
198 | spin_lock(&inode->i_lock); | |
199 | state->state |= open_flags; | |
200 | /* NB! List reordering - see the reclaim code for why. */ | |
201 | if ((open_flags & FMODE_WRITE) && 0 == state->nwriters++) | |
202 | list_move(&state->open_states, &state->owner->so_states); | |
203 | if (open_flags & FMODE_READ) | |
204 | state->nreaders++; | |
205 | memcpy(&state->stateid, stateid, sizeof(state->stateid)); | |
206 | spin_unlock(&inode->i_lock); | |
207 | } | |
208 | ||
209 | /* | |
210 | * OPEN_RECLAIM: | |
211 | * reclaim state on the server after a reboot. | |
212 | * Assumes caller is holding the sp->so_sem | |
213 | */ | |
214 | static int _nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) | |
215 | { | |
216 | struct inode *inode = state->inode; | |
217 | struct nfs_server *server = NFS_SERVER(inode); | |
218 | struct nfs_delegation *delegation = NFS_I(inode)->delegation; | |
219 | struct nfs_openargs o_arg = { | |
220 | .fh = NFS_FH(inode), | |
221 | .seqid = sp->so_seqid, | |
222 | .id = sp->so_id, | |
223 | .open_flags = state->state, | |
224 | .clientid = server->nfs4_state->cl_clientid, | |
225 | .claim = NFS4_OPEN_CLAIM_PREVIOUS, | |
226 | .bitmask = server->attr_bitmask, | |
227 | }; | |
228 | struct nfs_openres o_res = { | |
229 | .server = server, /* Grrr */ | |
230 | }; | |
231 | struct rpc_message msg = { | |
232 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR], | |
233 | .rpc_argp = &o_arg, | |
234 | .rpc_resp = &o_res, | |
235 | .rpc_cred = sp->so_cred, | |
236 | }; | |
237 | int status; | |
238 | ||
239 | if (delegation != NULL) { | |
240 | if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) { | |
241 | memcpy(&state->stateid, &delegation->stateid, | |
242 | sizeof(state->stateid)); | |
243 | set_bit(NFS_DELEGATED_STATE, &state->flags); | |
244 | return 0; | |
245 | } | |
246 | o_arg.u.delegation_type = delegation->type; | |
247 | } | |
248 | status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); | |
249 | nfs4_increment_seqid(status, sp); | |
250 | if (status == 0) { | |
251 | memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid)); | |
252 | if (o_res.delegation_type != 0) { | |
253 | nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res); | |
254 | /* Did the server issue an immediate delegation recall? */ | |
255 | if (o_res.do_recall) | |
256 | nfs_async_inode_return_delegation(inode, &o_res.stateid); | |
257 | } | |
258 | } | |
259 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
260 | /* Ensure we update the inode attributes */ | |
261 | NFS_CACHEINV(inode); | |
262 | return status; | |
263 | } | |
264 | ||
265 | static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state) | |
266 | { | |
267 | struct nfs_server *server = NFS_SERVER(state->inode); | |
268 | struct nfs4_exception exception = { }; | |
269 | int err; | |
270 | do { | |
271 | err = _nfs4_open_reclaim(sp, state); | |
202b50dc TM |
272 | if (err != -NFS4ERR_DELAY) |
273 | break; | |
274 | nfs4_handle_exception(server, err, &exception); | |
1da177e4 LT |
275 | } while (exception.retry); |
276 | return err; | |
277 | } | |
278 | ||
279 | static int _nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state) | |
280 | { | |
281 | struct nfs4_state_owner *sp = state->owner; | |
282 | struct inode *inode = dentry->d_inode; | |
283 | struct nfs_server *server = NFS_SERVER(inode); | |
284 | struct dentry *parent = dget_parent(dentry); | |
285 | struct nfs_openargs arg = { | |
286 | .fh = NFS_FH(parent->d_inode), | |
287 | .clientid = server->nfs4_state->cl_clientid, | |
288 | .name = &dentry->d_name, | |
289 | .id = sp->so_id, | |
290 | .server = server, | |
291 | .bitmask = server->attr_bitmask, | |
292 | .claim = NFS4_OPEN_CLAIM_DELEGATE_CUR, | |
293 | }; | |
294 | struct nfs_openres res = { | |
295 | .server = server, | |
296 | }; | |
297 | struct rpc_message msg = { | |
298 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR], | |
299 | .rpc_argp = &arg, | |
300 | .rpc_resp = &res, | |
301 | .rpc_cred = sp->so_cred, | |
302 | }; | |
303 | int status = 0; | |
304 | ||
305 | down(&sp->so_sema); | |
306 | if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) | |
307 | goto out; | |
308 | if (state->state == 0) | |
309 | goto out; | |
310 | arg.seqid = sp->so_seqid; | |
311 | arg.open_flags = state->state; | |
312 | memcpy(arg.u.delegation.data, state->stateid.data, sizeof(arg.u.delegation.data)); | |
313 | status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); | |
314 | nfs4_increment_seqid(status, sp); | |
315 | if (status >= 0) { | |
316 | memcpy(state->stateid.data, res.stateid.data, | |
317 | sizeof(state->stateid.data)); | |
318 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
319 | } | |
320 | out: | |
321 | up(&sp->so_sema); | |
322 | dput(parent); | |
323 | return status; | |
324 | } | |
325 | ||
326 | int nfs4_open_delegation_recall(struct dentry *dentry, struct nfs4_state *state) | |
327 | { | |
328 | struct nfs4_exception exception = { }; | |
329 | struct nfs_server *server = NFS_SERVER(dentry->d_inode); | |
330 | int err; | |
331 | do { | |
332 | err = _nfs4_open_delegation_recall(dentry, state); | |
333 | switch (err) { | |
334 | case 0: | |
335 | return err; | |
336 | case -NFS4ERR_STALE_CLIENTID: | |
337 | case -NFS4ERR_STALE_STATEID: | |
338 | case -NFS4ERR_EXPIRED: | |
339 | /* Don't recall a delegation if it was lost */ | |
340 | nfs4_schedule_state_recovery(server->nfs4_state); | |
341 | return err; | |
342 | } | |
343 | err = nfs4_handle_exception(server, err, &exception); | |
344 | } while (exception.retry); | |
345 | return err; | |
346 | } | |
347 | ||
348 | static inline int _nfs4_proc_open_confirm(struct rpc_clnt *clnt, const struct nfs_fh *fh, struct nfs4_state_owner *sp, nfs4_stateid *stateid) | |
349 | { | |
350 | struct nfs_open_confirmargs arg = { | |
351 | .fh = fh, | |
352 | .seqid = sp->so_seqid, | |
353 | .stateid = *stateid, | |
354 | }; | |
355 | struct nfs_open_confirmres res; | |
356 | struct rpc_message msg = { | |
357 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM], | |
358 | .rpc_argp = &arg, | |
359 | .rpc_resp = &res, | |
360 | .rpc_cred = sp->so_cred, | |
361 | }; | |
362 | int status; | |
363 | ||
364 | status = rpc_call_sync(clnt, &msg, RPC_TASK_NOINTR); | |
365 | nfs4_increment_seqid(status, sp); | |
366 | if (status >= 0) | |
367 | memcpy(stateid, &res.stateid, sizeof(*stateid)); | |
368 | return status; | |
369 | } | |
370 | ||
371 | static int _nfs4_proc_open(struct inode *dir, struct nfs4_state_owner *sp, struct nfs_openargs *o_arg, struct nfs_openres *o_res) | |
372 | { | |
373 | struct nfs_server *server = NFS_SERVER(dir); | |
374 | struct rpc_message msg = { | |
375 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN], | |
376 | .rpc_argp = o_arg, | |
377 | .rpc_resp = o_res, | |
378 | .rpc_cred = sp->so_cred, | |
379 | }; | |
380 | int status; | |
381 | ||
382 | /* Update sequence id. The caller must serialize! */ | |
383 | o_arg->seqid = sp->so_seqid; | |
384 | o_arg->id = sp->so_id; | |
385 | o_arg->clientid = sp->so_client->cl_clientid; | |
386 | ||
387 | status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); | |
388 | nfs4_increment_seqid(status, sp); | |
389 | if (status != 0) | |
390 | goto out; | |
391 | update_changeattr(dir, &o_res->cinfo); | |
392 | if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) { | |
393 | status = _nfs4_proc_open_confirm(server->client, &o_res->fh, | |
394 | sp, &o_res->stateid); | |
395 | if (status != 0) | |
396 | goto out; | |
397 | } | |
398 | if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) | |
399 | status = server->rpc_ops->getattr(server, &o_res->fh, o_res->f_attr); | |
400 | out: | |
401 | return status; | |
402 | } | |
403 | ||
404 | static int _nfs4_do_access(struct inode *inode, struct rpc_cred *cred, int openflags) | |
405 | { | |
406 | struct nfs_access_entry cache; | |
407 | int mask = 0; | |
408 | int status; | |
409 | ||
410 | if (openflags & FMODE_READ) | |
411 | mask |= MAY_READ; | |
412 | if (openflags & FMODE_WRITE) | |
413 | mask |= MAY_WRITE; | |
414 | status = nfs_access_get_cached(inode, cred, &cache); | |
415 | if (status == 0) | |
416 | goto out; | |
417 | ||
418 | /* Be clever: ask server to check for all possible rights */ | |
419 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; | |
420 | cache.cred = cred; | |
421 | cache.jiffies = jiffies; | |
422 | status = _nfs4_proc_access(inode, &cache); | |
423 | if (status != 0) | |
424 | return status; | |
425 | nfs_access_add_cache(inode, &cache); | |
426 | out: | |
427 | if ((cache.mask & mask) == mask) | |
428 | return 0; | |
429 | return -EACCES; | |
430 | } | |
431 | ||
432 | /* | |
433 | * OPEN_EXPIRED: | |
434 | * reclaim state on the server after a network partition. | |
435 | * Assumes caller holds the appropriate lock | |
436 | */ | |
437 | static int _nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) | |
438 | { | |
439 | struct dentry *parent = dget_parent(dentry); | |
440 | struct inode *dir = parent->d_inode; | |
441 | struct inode *inode = state->inode; | |
442 | struct nfs_server *server = NFS_SERVER(dir); | |
443 | struct nfs_delegation *delegation = NFS_I(inode)->delegation; | |
444 | struct nfs_fattr f_attr = { | |
445 | .valid = 0, | |
446 | }; | |
447 | struct nfs_openargs o_arg = { | |
448 | .fh = NFS_FH(dir), | |
449 | .open_flags = state->state, | |
450 | .name = &dentry->d_name, | |
451 | .bitmask = server->attr_bitmask, | |
452 | .claim = NFS4_OPEN_CLAIM_NULL, | |
453 | }; | |
454 | struct nfs_openres o_res = { | |
455 | .f_attr = &f_attr, | |
456 | .server = server, | |
457 | }; | |
458 | int status = 0; | |
459 | ||
460 | if (delegation != NULL && !(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) { | |
461 | status = _nfs4_do_access(inode, sp->so_cred, state->state); | |
462 | if (status < 0) | |
463 | goto out; | |
464 | memcpy(&state->stateid, &delegation->stateid, sizeof(state->stateid)); | |
465 | set_bit(NFS_DELEGATED_STATE, &state->flags); | |
466 | goto out; | |
467 | } | |
468 | status = _nfs4_proc_open(dir, sp, &o_arg, &o_res); | |
469 | if (status != 0) | |
470 | goto out_nodeleg; | |
471 | /* Check if files differ */ | |
472 | if ((f_attr.mode & S_IFMT) != (inode->i_mode & S_IFMT)) | |
473 | goto out_stale; | |
474 | /* Has the file handle changed? */ | |
475 | if (nfs_compare_fh(&o_res.fh, NFS_FH(inode)) != 0) { | |
476 | /* Verify if the change attributes are the same */ | |
477 | if (f_attr.change_attr != NFS_I(inode)->change_attr) | |
478 | goto out_stale; | |
479 | if (nfs_size_to_loff_t(f_attr.size) != inode->i_size) | |
480 | goto out_stale; | |
481 | /* Lets just pretend that this is the same file */ | |
482 | nfs_copy_fh(NFS_FH(inode), &o_res.fh); | |
483 | NFS_I(inode)->fileid = f_attr.fileid; | |
484 | } | |
485 | memcpy(&state->stateid, &o_res.stateid, sizeof(state->stateid)); | |
486 | if (o_res.delegation_type != 0) { | |
487 | if (!(delegation->flags & NFS_DELEGATION_NEED_RECLAIM)) | |
488 | nfs_inode_set_delegation(inode, sp->so_cred, &o_res); | |
489 | else | |
490 | nfs_inode_reclaim_delegation(inode, sp->so_cred, &o_res); | |
491 | } | |
492 | out_nodeleg: | |
493 | clear_bit(NFS_DELEGATED_STATE, &state->flags); | |
494 | out: | |
495 | dput(parent); | |
496 | return status; | |
497 | out_stale: | |
498 | status = -ESTALE; | |
499 | /* Invalidate the state owner so we don't ever use it again */ | |
500 | nfs4_drop_state_owner(sp); | |
501 | d_drop(dentry); | |
502 | /* Should we be trying to close that stateid? */ | |
503 | goto out_nodeleg; | |
504 | } | |
505 | ||
202b50dc TM |
506 | static inline int nfs4_do_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state, struct dentry *dentry) |
507 | { | |
508 | struct nfs_server *server = NFS_SERVER(dentry->d_inode); | |
509 | struct nfs4_exception exception = { }; | |
510 | int err; | |
511 | ||
512 | do { | |
513 | err = _nfs4_open_expired(sp, state, dentry); | |
514 | if (err == -NFS4ERR_DELAY) | |
515 | nfs4_handle_exception(server, err, &exception); | |
516 | } while (exception.retry); | |
517 | return err; | |
518 | } | |
519 | ||
1da177e4 LT |
520 | static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state) |
521 | { | |
522 | struct nfs_inode *nfsi = NFS_I(state->inode); | |
523 | struct nfs_open_context *ctx; | |
524 | int status; | |
525 | ||
526 | spin_lock(&state->inode->i_lock); | |
527 | list_for_each_entry(ctx, &nfsi->open_files, list) { | |
528 | if (ctx->state != state) | |
529 | continue; | |
530 | get_nfs_open_context(ctx); | |
531 | spin_unlock(&state->inode->i_lock); | |
202b50dc | 532 | status = nfs4_do_open_expired(sp, state, ctx->dentry); |
1da177e4 LT |
533 | put_nfs_open_context(ctx); |
534 | return status; | |
535 | } | |
536 | spin_unlock(&state->inode->i_lock); | |
537 | return -ENOENT; | |
538 | } | |
539 | ||
540 | /* | |
541 | * Returns an nfs4_state + an extra reference to the inode | |
542 | */ | |
543 | static int _nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred, struct nfs4_state **res) | |
544 | { | |
545 | struct nfs_delegation *delegation; | |
546 | struct nfs_server *server = NFS_SERVER(inode); | |
547 | struct nfs4_client *clp = server->nfs4_state; | |
548 | struct nfs_inode *nfsi = NFS_I(inode); | |
549 | struct nfs4_state_owner *sp = NULL; | |
550 | struct nfs4_state *state = NULL; | |
551 | int open_flags = flags & (FMODE_READ|FMODE_WRITE); | |
552 | int err; | |
553 | ||
554 | /* Protect against reboot recovery - NOTE ORDER! */ | |
555 | down_read(&clp->cl_sem); | |
556 | /* Protect against delegation recall */ | |
557 | down_read(&nfsi->rwsem); | |
558 | delegation = NFS_I(inode)->delegation; | |
559 | err = -ENOENT; | |
560 | if (delegation == NULL || (delegation->type & open_flags) != open_flags) | |
561 | goto out_err; | |
562 | err = -ENOMEM; | |
563 | if (!(sp = nfs4_get_state_owner(server, cred))) { | |
564 | dprintk("%s: nfs4_get_state_owner failed!\n", __FUNCTION__); | |
565 | goto out_err; | |
566 | } | |
567 | down(&sp->so_sema); | |
568 | state = nfs4_get_open_state(inode, sp); | |
569 | if (state == NULL) | |
570 | goto out_err; | |
571 | ||
572 | err = -ENOENT; | |
573 | if ((state->state & open_flags) == open_flags) { | |
574 | spin_lock(&inode->i_lock); | |
575 | if (open_flags & FMODE_READ) | |
576 | state->nreaders++; | |
577 | if (open_flags & FMODE_WRITE) | |
578 | state->nwriters++; | |
579 | spin_unlock(&inode->i_lock); | |
580 | goto out_ok; | |
581 | } else if (state->state != 0) | |
582 | goto out_err; | |
583 | ||
584 | lock_kernel(); | |
585 | err = _nfs4_do_access(inode, cred, open_flags); | |
586 | unlock_kernel(); | |
587 | if (err != 0) | |
588 | goto out_err; | |
589 | set_bit(NFS_DELEGATED_STATE, &state->flags); | |
590 | update_open_stateid(state, &delegation->stateid, open_flags); | |
591 | out_ok: | |
592 | up(&sp->so_sema); | |
593 | nfs4_put_state_owner(sp); | |
594 | up_read(&nfsi->rwsem); | |
595 | up_read(&clp->cl_sem); | |
596 | igrab(inode); | |
597 | *res = state; | |
598 | return 0; | |
599 | out_err: | |
600 | if (sp != NULL) { | |
601 | if (state != NULL) | |
602 | nfs4_put_open_state(state); | |
603 | up(&sp->so_sema); | |
604 | nfs4_put_state_owner(sp); | |
605 | } | |
606 | up_read(&nfsi->rwsem); | |
607 | up_read(&clp->cl_sem); | |
608 | return err; | |
609 | } | |
610 | ||
611 | static struct nfs4_state *nfs4_open_delegated(struct inode *inode, int flags, struct rpc_cred *cred) | |
612 | { | |
613 | struct nfs4_exception exception = { }; | |
614 | struct nfs4_state *res; | |
615 | int err; | |
616 | ||
617 | do { | |
618 | err = _nfs4_open_delegated(inode, flags, cred, &res); | |
619 | if (err == 0) | |
620 | break; | |
621 | res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(inode), | |
622 | err, &exception)); | |
623 | } while (exception.retry); | |
624 | return res; | |
625 | } | |
626 | ||
627 | /* | |
628 | * Returns an nfs4_state + an referenced inode | |
629 | */ | |
630 | static int _nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred, struct nfs4_state **res) | |
631 | { | |
632 | struct nfs4_state_owner *sp; | |
633 | struct nfs4_state *state = NULL; | |
634 | struct nfs_server *server = NFS_SERVER(dir); | |
635 | struct nfs4_client *clp = server->nfs4_state; | |
636 | struct inode *inode = NULL; | |
637 | int status; | |
638 | struct nfs_fattr f_attr = { | |
639 | .valid = 0, | |
640 | }; | |
641 | struct nfs_openargs o_arg = { | |
642 | .fh = NFS_FH(dir), | |
643 | .open_flags = flags, | |
644 | .name = &dentry->d_name, | |
645 | .server = server, | |
646 | .bitmask = server->attr_bitmask, | |
647 | .claim = NFS4_OPEN_CLAIM_NULL, | |
648 | }; | |
649 | struct nfs_openres o_res = { | |
650 | .f_attr = &f_attr, | |
651 | .server = server, | |
652 | }; | |
653 | ||
654 | /* Protect against reboot recovery conflicts */ | |
655 | down_read(&clp->cl_sem); | |
656 | status = -ENOMEM; | |
657 | if (!(sp = nfs4_get_state_owner(server, cred))) { | |
658 | dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n"); | |
659 | goto out_err; | |
660 | } | |
661 | if (flags & O_EXCL) { | |
662 | u32 *p = (u32 *) o_arg.u.verifier.data; | |
663 | p[0] = jiffies; | |
664 | p[1] = current->pid; | |
665 | } else | |
666 | o_arg.u.attrs = sattr; | |
667 | /* Serialization for the sequence id */ | |
668 | down(&sp->so_sema); | |
669 | ||
670 | status = _nfs4_proc_open(dir, sp, &o_arg, &o_res); | |
671 | if (status != 0) | |
672 | goto out_err; | |
673 | ||
674 | status = -ENOMEM; | |
675 | inode = nfs_fhget(dir->i_sb, &o_res.fh, &f_attr); | |
676 | if (!inode) | |
677 | goto out_err; | |
678 | state = nfs4_get_open_state(inode, sp); | |
679 | if (!state) | |
680 | goto out_err; | |
681 | update_open_stateid(state, &o_res.stateid, flags); | |
682 | if (o_res.delegation_type != 0) | |
683 | nfs_inode_set_delegation(inode, cred, &o_res); | |
684 | up(&sp->so_sema); | |
685 | nfs4_put_state_owner(sp); | |
686 | up_read(&clp->cl_sem); | |
687 | *res = state; | |
688 | return 0; | |
689 | out_err: | |
690 | if (sp != NULL) { | |
691 | if (state != NULL) | |
692 | nfs4_put_open_state(state); | |
693 | up(&sp->so_sema); | |
694 | nfs4_put_state_owner(sp); | |
695 | } | |
696 | /* Note: clp->cl_sem must be released before nfs4_put_open_state()! */ | |
697 | up_read(&clp->cl_sem); | |
698 | if (inode != NULL) | |
699 | iput(inode); | |
700 | *res = NULL; | |
701 | return status; | |
702 | } | |
703 | ||
704 | ||
705 | static struct nfs4_state *nfs4_do_open(struct inode *dir, struct dentry *dentry, int flags, struct iattr *sattr, struct rpc_cred *cred) | |
706 | { | |
707 | struct nfs4_exception exception = { }; | |
708 | struct nfs4_state *res; | |
709 | int status; | |
710 | ||
711 | do { | |
712 | status = _nfs4_do_open(dir, dentry, flags, sattr, cred, &res); | |
713 | if (status == 0) | |
714 | break; | |
715 | /* NOTE: BAD_SEQID means the server and client disagree about the | |
716 | * book-keeping w.r.t. state-changing operations | |
717 | * (OPEN/CLOSE/LOCK/LOCKU...) | |
718 | * It is actually a sign of a bug on the client or on the server. | |
719 | * | |
720 | * If we receive a BAD_SEQID error in the particular case of | |
721 | * doing an OPEN, we assume that nfs4_increment_seqid() will | |
722 | * have unhashed the old state_owner for us, and that we can | |
723 | * therefore safely retry using a new one. We should still warn | |
724 | * the user though... | |
725 | */ | |
726 | if (status == -NFS4ERR_BAD_SEQID) { | |
727 | printk(KERN_WARNING "NFS: v4 server returned a bad sequence-id error!\n"); | |
728 | exception.retry = 1; | |
729 | continue; | |
730 | } | |
731 | res = ERR_PTR(nfs4_handle_exception(NFS_SERVER(dir), | |
732 | status, &exception)); | |
733 | } while (exception.retry); | |
734 | return res; | |
735 | } | |
736 | ||
737 | static int _nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr, | |
738 | struct nfs_fh *fhandle, struct iattr *sattr, | |
739 | struct nfs4_state *state) | |
740 | { | |
741 | struct nfs_setattrargs arg = { | |
742 | .fh = fhandle, | |
743 | .iap = sattr, | |
744 | .server = server, | |
745 | .bitmask = server->attr_bitmask, | |
746 | }; | |
747 | struct nfs_setattrres res = { | |
748 | .fattr = fattr, | |
749 | .server = server, | |
750 | }; | |
751 | struct rpc_message msg = { | |
752 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETATTR], | |
753 | .rpc_argp = &arg, | |
754 | .rpc_resp = &res, | |
755 | }; | |
756 | ||
757 | fattr->valid = 0; | |
758 | ||
759 | if (state != NULL) | |
760 | msg.rpc_cred = state->owner->so_cred; | |
761 | if (sattr->ia_valid & ATTR_SIZE) | |
762 | nfs4_copy_stateid(&arg.stateid, state, NULL); | |
763 | else | |
764 | memcpy(&arg.stateid, &zero_stateid, sizeof(arg.stateid)); | |
765 | ||
766 | return rpc_call_sync(server->client, &msg, 0); | |
767 | } | |
768 | ||
769 | static int nfs4_do_setattr(struct nfs_server *server, struct nfs_fattr *fattr, | |
770 | struct nfs_fh *fhandle, struct iattr *sattr, | |
771 | struct nfs4_state *state) | |
772 | { | |
773 | struct nfs4_exception exception = { }; | |
774 | int err; | |
775 | do { | |
776 | err = nfs4_handle_exception(server, | |
777 | _nfs4_do_setattr(server, fattr, fhandle, sattr, | |
778 | state), | |
779 | &exception); | |
780 | } while (exception.retry); | |
781 | return err; | |
782 | } | |
783 | ||
784 | struct nfs4_closedata { | |
785 | struct inode *inode; | |
786 | struct nfs4_state *state; | |
787 | struct nfs_closeargs arg; | |
788 | struct nfs_closeres res; | |
789 | }; | |
790 | ||
791 | static void nfs4_close_done(struct rpc_task *task) | |
792 | { | |
793 | struct nfs4_closedata *calldata = (struct nfs4_closedata *)task->tk_calldata; | |
794 | struct nfs4_state *state = calldata->state; | |
795 | struct nfs4_state_owner *sp = state->owner; | |
796 | struct nfs_server *server = NFS_SERVER(calldata->inode); | |
797 | ||
798 | /* hmm. we are done with the inode, and in the process of freeing | |
799 | * the state_owner. we keep this around to process errors | |
800 | */ | |
801 | nfs4_increment_seqid(task->tk_status, sp); | |
802 | switch (task->tk_status) { | |
803 | case 0: | |
804 | memcpy(&state->stateid, &calldata->res.stateid, | |
805 | sizeof(state->stateid)); | |
806 | break; | |
807 | case -NFS4ERR_STALE_STATEID: | |
808 | case -NFS4ERR_EXPIRED: | |
809 | state->state = calldata->arg.open_flags; | |
810 | nfs4_schedule_state_recovery(server->nfs4_state); | |
811 | break; | |
812 | default: | |
813 | if (nfs4_async_handle_error(task, server) == -EAGAIN) { | |
814 | rpc_restart_call(task); | |
815 | return; | |
816 | } | |
817 | } | |
818 | state->state = calldata->arg.open_flags; | |
819 | nfs4_put_open_state(state); | |
820 | up(&sp->so_sema); | |
821 | nfs4_put_state_owner(sp); | |
822 | up_read(&server->nfs4_state->cl_sem); | |
823 | kfree(calldata); | |
824 | } | |
825 | ||
826 | static inline int nfs4_close_call(struct rpc_clnt *clnt, struct nfs4_closedata *calldata) | |
827 | { | |
828 | struct rpc_message msg = { | |
829 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE], | |
830 | .rpc_argp = &calldata->arg, | |
831 | .rpc_resp = &calldata->res, | |
832 | .rpc_cred = calldata->state->owner->so_cred, | |
833 | }; | |
834 | if (calldata->arg.open_flags != 0) | |
835 | msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE]; | |
836 | return rpc_call_async(clnt, &msg, 0, nfs4_close_done, calldata); | |
837 | } | |
838 | ||
839 | /* | |
840 | * It is possible for data to be read/written from a mem-mapped file | |
841 | * after the sys_close call (which hits the vfs layer as a flush). | |
842 | * This means that we can't safely call nfsv4 close on a file until | |
843 | * the inode is cleared. This in turn means that we are not good | |
844 | * NFSv4 citizens - we do not indicate to the server to update the file's | |
845 | * share state even when we are done with one of the three share | |
846 | * stateid's in the inode. | |
847 | * | |
848 | * NOTE: Caller must be holding the sp->so_owner semaphore! | |
849 | */ | |
850 | int nfs4_do_close(struct inode *inode, struct nfs4_state *state, mode_t mode) | |
851 | { | |
852 | struct nfs4_closedata *calldata; | |
853 | int status; | |
854 | ||
855 | /* Tell caller we're done */ | |
856 | if (test_bit(NFS_DELEGATED_STATE, &state->flags)) { | |
857 | state->state = mode; | |
858 | return 0; | |
859 | } | |
860 | calldata = (struct nfs4_closedata *)kmalloc(sizeof(*calldata), GFP_KERNEL); | |
861 | if (calldata == NULL) | |
862 | return -ENOMEM; | |
863 | calldata->inode = inode; | |
864 | calldata->state = state; | |
865 | calldata->arg.fh = NFS_FH(inode); | |
866 | /* Serialization for the sequence id */ | |
867 | calldata->arg.seqid = state->owner->so_seqid; | |
868 | calldata->arg.open_flags = mode; | |
869 | memcpy(&calldata->arg.stateid, &state->stateid, | |
870 | sizeof(calldata->arg.stateid)); | |
871 | status = nfs4_close_call(NFS_SERVER(inode)->client, calldata); | |
872 | /* | |
873 | * Return -EINPROGRESS on success in order to indicate to the | |
874 | * caller that an asynchronous RPC call has been launched, and | |
875 | * that it will release the semaphores on completion. | |
876 | */ | |
877 | return (status == 0) ? -EINPROGRESS : status; | |
878 | } | |
879 | ||
880 | struct inode * | |
881 | nfs4_atomic_open(struct inode *dir, struct dentry *dentry, struct nameidata *nd) | |
882 | { | |
883 | struct iattr attr; | |
884 | struct rpc_cred *cred; | |
885 | struct nfs4_state *state; | |
886 | ||
887 | if (nd->flags & LOOKUP_CREATE) { | |
888 | attr.ia_mode = nd->intent.open.create_mode; | |
889 | attr.ia_valid = ATTR_MODE; | |
890 | if (!IS_POSIXACL(dir)) | |
891 | attr.ia_mode &= ~current->fs->umask; | |
892 | } else { | |
893 | attr.ia_valid = 0; | |
894 | BUG_ON(nd->intent.open.flags & O_CREAT); | |
895 | } | |
896 | ||
897 | cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0); | |
898 | if (IS_ERR(cred)) | |
899 | return (struct inode *)cred; | |
900 | state = nfs4_do_open(dir, dentry, nd->intent.open.flags, &attr, cred); | |
901 | put_rpccred(cred); | |
902 | if (IS_ERR(state)) | |
903 | return (struct inode *)state; | |
904 | return state->inode; | |
905 | } | |
906 | ||
907 | int | |
908 | nfs4_open_revalidate(struct inode *dir, struct dentry *dentry, int openflags) | |
909 | { | |
910 | struct rpc_cred *cred; | |
911 | struct nfs4_state *state; | |
912 | struct inode *inode; | |
913 | ||
914 | cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0); | |
915 | if (IS_ERR(cred)) | |
916 | return PTR_ERR(cred); | |
917 | state = nfs4_open_delegated(dentry->d_inode, openflags, cred); | |
918 | if (IS_ERR(state)) | |
919 | state = nfs4_do_open(dir, dentry, openflags, NULL, cred); | |
920 | put_rpccred(cred); | |
921 | if (state == ERR_PTR(-ENOENT) && dentry->d_inode == 0) | |
922 | return 1; | |
923 | if (IS_ERR(state)) | |
924 | return 0; | |
925 | inode = state->inode; | |
926 | if (inode == dentry->d_inode) { | |
927 | iput(inode); | |
928 | return 1; | |
929 | } | |
930 | d_drop(dentry); | |
931 | nfs4_close_state(state, openflags); | |
932 | iput(inode); | |
933 | return 0; | |
934 | } | |
935 | ||
936 | ||
937 | static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) | |
938 | { | |
939 | struct nfs4_server_caps_res res = {}; | |
940 | struct rpc_message msg = { | |
941 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS], | |
942 | .rpc_argp = fhandle, | |
943 | .rpc_resp = &res, | |
944 | }; | |
945 | int status; | |
946 | ||
947 | status = rpc_call_sync(server->client, &msg, 0); | |
948 | if (status == 0) { | |
949 | memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask)); | |
950 | if (res.attr_bitmask[0] & FATTR4_WORD0_ACL) | |
951 | server->caps |= NFS_CAP_ACLS; | |
952 | if (res.has_links != 0) | |
953 | server->caps |= NFS_CAP_HARDLINKS; | |
954 | if (res.has_symlinks != 0) | |
955 | server->caps |= NFS_CAP_SYMLINKS; | |
956 | server->acl_bitmask = res.acl_bitmask; | |
957 | } | |
958 | return status; | |
959 | } | |
960 | ||
961 | static int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle) | |
962 | { | |
963 | struct nfs4_exception exception = { }; | |
964 | int err; | |
965 | do { | |
966 | err = nfs4_handle_exception(server, | |
967 | _nfs4_server_capabilities(server, fhandle), | |
968 | &exception); | |
969 | } while (exception.retry); | |
970 | return err; | |
971 | } | |
972 | ||
973 | static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, | |
974 | struct nfs_fsinfo *info) | |
975 | { | |
976 | struct nfs_fattr * fattr = info->fattr; | |
977 | struct nfs4_lookup_root_arg args = { | |
978 | .bitmask = nfs4_fattr_bitmap, | |
979 | }; | |
980 | struct nfs4_lookup_res res = { | |
981 | .server = server, | |
982 | .fattr = fattr, | |
983 | .fh = fhandle, | |
984 | }; | |
985 | struct rpc_message msg = { | |
986 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT], | |
987 | .rpc_argp = &args, | |
988 | .rpc_resp = &res, | |
989 | }; | |
990 | fattr->valid = 0; | |
991 | return rpc_call_sync(server->client, &msg, 0); | |
992 | } | |
993 | ||
994 | static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle, | |
995 | struct nfs_fsinfo *info) | |
996 | { | |
997 | struct nfs4_exception exception = { }; | |
998 | int err; | |
999 | do { | |
1000 | err = nfs4_handle_exception(server, | |
1001 | _nfs4_lookup_root(server, fhandle, info), | |
1002 | &exception); | |
1003 | } while (exception.retry); | |
1004 | return err; | |
1005 | } | |
1006 | ||
1007 | static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle, | |
1008 | struct nfs_fsinfo *info) | |
1009 | { | |
1010 | struct nfs_fattr * fattr = info->fattr; | |
1011 | unsigned char * p; | |
1012 | struct qstr q; | |
1013 | struct nfs4_lookup_arg args = { | |
1014 | .dir_fh = fhandle, | |
1015 | .name = &q, | |
1016 | .bitmask = nfs4_fattr_bitmap, | |
1017 | }; | |
1018 | struct nfs4_lookup_res res = { | |
1019 | .server = server, | |
1020 | .fattr = fattr, | |
1021 | .fh = fhandle, | |
1022 | }; | |
1023 | struct rpc_message msg = { | |
1024 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], | |
1025 | .rpc_argp = &args, | |
1026 | .rpc_resp = &res, | |
1027 | }; | |
1028 | int status; | |
1029 | ||
1030 | /* | |
1031 | * Now we do a separate LOOKUP for each component of the mount path. | |
1032 | * The LOOKUPs are done separately so that we can conveniently | |
1033 | * catch an ERR_WRONGSEC if it occurs along the way... | |
1034 | */ | |
1035 | status = nfs4_lookup_root(server, fhandle, info); | |
1036 | if (status) | |
1037 | goto out; | |
1038 | ||
1039 | p = server->mnt_path; | |
1040 | for (;;) { | |
1041 | struct nfs4_exception exception = { }; | |
1042 | ||
1043 | while (*p == '/') | |
1044 | p++; | |
1045 | if (!*p) | |
1046 | break; | |
1047 | q.name = p; | |
1048 | while (*p && (*p != '/')) | |
1049 | p++; | |
1050 | q.len = p - q.name; | |
1051 | ||
1052 | do { | |
1053 | fattr->valid = 0; | |
1054 | status = nfs4_handle_exception(server, | |
1055 | rpc_call_sync(server->client, &msg, 0), | |
1056 | &exception); | |
1057 | } while (exception.retry); | |
1058 | if (status == 0) | |
1059 | continue; | |
1060 | if (status == -ENOENT) { | |
1061 | printk(KERN_NOTICE "NFS: mount path %s does not exist!\n", server->mnt_path); | |
1062 | printk(KERN_NOTICE "NFS: suggestion: try mounting '/' instead.\n"); | |
1063 | } | |
1064 | break; | |
1065 | } | |
1066 | if (status == 0) | |
1067 | status = nfs4_server_capabilities(server, fhandle); | |
1068 | if (status == 0) | |
1069 | status = nfs4_do_fsinfo(server, fhandle, info); | |
1070 | out: | |
1071 | return status; | |
1072 | } | |
1073 | ||
1074 | static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) | |
1075 | { | |
1076 | struct nfs4_getattr_arg args = { | |
1077 | .fh = fhandle, | |
1078 | .bitmask = server->attr_bitmask, | |
1079 | }; | |
1080 | struct nfs4_getattr_res res = { | |
1081 | .fattr = fattr, | |
1082 | .server = server, | |
1083 | }; | |
1084 | struct rpc_message msg = { | |
1085 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR], | |
1086 | .rpc_argp = &args, | |
1087 | .rpc_resp = &res, | |
1088 | }; | |
1089 | ||
1090 | fattr->valid = 0; | |
1091 | return rpc_call_sync(server->client, &msg, 0); | |
1092 | } | |
1093 | ||
1094 | static int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr) | |
1095 | { | |
1096 | struct nfs4_exception exception = { }; | |
1097 | int err; | |
1098 | do { | |
1099 | err = nfs4_handle_exception(server, | |
1100 | _nfs4_proc_getattr(server, fhandle, fattr), | |
1101 | &exception); | |
1102 | } while (exception.retry); | |
1103 | return err; | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * The file is not closed if it is opened due to the a request to change | |
1108 | * the size of the file. The open call will not be needed once the | |
1109 | * VFS layer lookup-intents are implemented. | |
1110 | * | |
1111 | * Close is called when the inode is destroyed. | |
1112 | * If we haven't opened the file for O_WRONLY, we | |
1113 | * need to in the size_change case to obtain a stateid. | |
1114 | * | |
1115 | * Got race? | |
1116 | * Because OPEN is always done by name in nfsv4, it is | |
1117 | * possible that we opened a different file by the same | |
1118 | * name. We can recognize this race condition, but we | |
1119 | * can't do anything about it besides returning an error. | |
1120 | * | |
1121 | * This will be fixed with VFS changes (lookup-intent). | |
1122 | */ | |
1123 | static int | |
1124 | nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, | |
1125 | struct iattr *sattr) | |
1126 | { | |
1127 | struct inode * inode = dentry->d_inode; | |
1128 | int size_change = sattr->ia_valid & ATTR_SIZE; | |
1129 | struct nfs4_state *state = NULL; | |
1130 | int need_iput = 0; | |
1131 | int status; | |
1132 | ||
1133 | fattr->valid = 0; | |
1134 | ||
1135 | if (size_change) { | |
1136 | struct rpc_cred *cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0); | |
1137 | if (IS_ERR(cred)) | |
1138 | return PTR_ERR(cred); | |
1139 | state = nfs4_find_state(inode, cred, FMODE_WRITE); | |
1140 | if (state == NULL) { | |
1141 | state = nfs4_open_delegated(dentry->d_inode, | |
1142 | FMODE_WRITE, cred); | |
1143 | if (IS_ERR(state)) | |
1144 | state = nfs4_do_open(dentry->d_parent->d_inode, | |
1145 | dentry, FMODE_WRITE, | |
1146 | NULL, cred); | |
1147 | need_iput = 1; | |
1148 | } | |
1149 | put_rpccred(cred); | |
1150 | if (IS_ERR(state)) | |
1151 | return PTR_ERR(state); | |
1152 | ||
1153 | if (state->inode != inode) { | |
1154 | printk(KERN_WARNING "nfs: raced in setattr (%p != %p), returning -EIO\n", inode, state->inode); | |
1155 | status = -EIO; | |
1156 | goto out; | |
1157 | } | |
1158 | } | |
1159 | status = nfs4_do_setattr(NFS_SERVER(inode), fattr, | |
1160 | NFS_FH(inode), sattr, state); | |
1161 | out: | |
1162 | if (state) { | |
1163 | inode = state->inode; | |
1164 | nfs4_close_state(state, FMODE_WRITE); | |
1165 | if (need_iput) | |
1166 | iput(inode); | |
1167 | } | |
1168 | return status; | |
1169 | } | |
1170 | ||
1171 | static int _nfs4_proc_lookup(struct inode *dir, struct qstr *name, | |
1172 | struct nfs_fh *fhandle, struct nfs_fattr *fattr) | |
1173 | { | |
1174 | int status; | |
1175 | struct nfs_server *server = NFS_SERVER(dir); | |
1176 | struct nfs4_lookup_arg args = { | |
1177 | .bitmask = server->attr_bitmask, | |
1178 | .dir_fh = NFS_FH(dir), | |
1179 | .name = name, | |
1180 | }; | |
1181 | struct nfs4_lookup_res res = { | |
1182 | .server = server, | |
1183 | .fattr = fattr, | |
1184 | .fh = fhandle, | |
1185 | }; | |
1186 | struct rpc_message msg = { | |
1187 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP], | |
1188 | .rpc_argp = &args, | |
1189 | .rpc_resp = &res, | |
1190 | }; | |
1191 | ||
1192 | fattr->valid = 0; | |
1193 | ||
1194 | dprintk("NFS call lookup %s\n", name->name); | |
1195 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
1196 | dprintk("NFS reply lookup: %d\n", status); | |
1197 | return status; | |
1198 | } | |
1199 | ||
1200 | static int nfs4_proc_lookup(struct inode *dir, struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr) | |
1201 | { | |
1202 | struct nfs4_exception exception = { }; | |
1203 | int err; | |
1204 | do { | |
1205 | err = nfs4_handle_exception(NFS_SERVER(dir), | |
1206 | _nfs4_proc_lookup(dir, name, fhandle, fattr), | |
1207 | &exception); | |
1208 | } while (exception.retry); | |
1209 | return err; | |
1210 | } | |
1211 | ||
1212 | static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) | |
1213 | { | |
1214 | struct nfs4_accessargs args = { | |
1215 | .fh = NFS_FH(inode), | |
1216 | }; | |
1217 | struct nfs4_accessres res = { 0 }; | |
1218 | struct rpc_message msg = { | |
1219 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS], | |
1220 | .rpc_argp = &args, | |
1221 | .rpc_resp = &res, | |
1222 | .rpc_cred = entry->cred, | |
1223 | }; | |
1224 | int mode = entry->mask; | |
1225 | int status; | |
1226 | ||
1227 | /* | |
1228 | * Determine which access bits we want to ask for... | |
1229 | */ | |
1230 | if (mode & MAY_READ) | |
1231 | args.access |= NFS4_ACCESS_READ; | |
1232 | if (S_ISDIR(inode->i_mode)) { | |
1233 | if (mode & MAY_WRITE) | |
1234 | args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE; | |
1235 | if (mode & MAY_EXEC) | |
1236 | args.access |= NFS4_ACCESS_LOOKUP; | |
1237 | } else { | |
1238 | if (mode & MAY_WRITE) | |
1239 | args.access |= NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND; | |
1240 | if (mode & MAY_EXEC) | |
1241 | args.access |= NFS4_ACCESS_EXECUTE; | |
1242 | } | |
1243 | status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); | |
1244 | if (!status) { | |
1245 | entry->mask = 0; | |
1246 | if (res.access & NFS4_ACCESS_READ) | |
1247 | entry->mask |= MAY_READ; | |
1248 | if (res.access & (NFS4_ACCESS_MODIFY | NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE)) | |
1249 | entry->mask |= MAY_WRITE; | |
1250 | if (res.access & (NFS4_ACCESS_LOOKUP|NFS4_ACCESS_EXECUTE)) | |
1251 | entry->mask |= MAY_EXEC; | |
1252 | } | |
1253 | return status; | |
1254 | } | |
1255 | ||
1256 | static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry) | |
1257 | { | |
1258 | struct nfs4_exception exception = { }; | |
1259 | int err; | |
1260 | do { | |
1261 | err = nfs4_handle_exception(NFS_SERVER(inode), | |
1262 | _nfs4_proc_access(inode, entry), | |
1263 | &exception); | |
1264 | } while (exception.retry); | |
1265 | return err; | |
1266 | } | |
1267 | ||
1268 | /* | |
1269 | * TODO: For the time being, we don't try to get any attributes | |
1270 | * along with any of the zero-copy operations READ, READDIR, | |
1271 | * READLINK, WRITE. | |
1272 | * | |
1273 | * In the case of the first three, we want to put the GETATTR | |
1274 | * after the read-type operation -- this is because it is hard | |
1275 | * to predict the length of a GETATTR response in v4, and thus | |
1276 | * align the READ data correctly. This means that the GETATTR | |
1277 | * may end up partially falling into the page cache, and we should | |
1278 | * shift it into the 'tail' of the xdr_buf before processing. | |
1279 | * To do this efficiently, we need to know the total length | |
1280 | * of data received, which doesn't seem to be available outside | |
1281 | * of the RPC layer. | |
1282 | * | |
1283 | * In the case of WRITE, we also want to put the GETATTR after | |
1284 | * the operation -- in this case because we want to make sure | |
1285 | * we get the post-operation mtime and size. This means that | |
1286 | * we can't use xdr_encode_pages() as written: we need a variant | |
1287 | * of it which would leave room in the 'tail' iovec. | |
1288 | * | |
1289 | * Both of these changes to the XDR layer would in fact be quite | |
1290 | * minor, but I decided to leave them for a subsequent patch. | |
1291 | */ | |
1292 | static int _nfs4_proc_readlink(struct inode *inode, struct page *page, | |
1293 | unsigned int pgbase, unsigned int pglen) | |
1294 | { | |
1295 | struct nfs4_readlink args = { | |
1296 | .fh = NFS_FH(inode), | |
1297 | .pgbase = pgbase, | |
1298 | .pglen = pglen, | |
1299 | .pages = &page, | |
1300 | }; | |
1301 | struct rpc_message msg = { | |
1302 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK], | |
1303 | .rpc_argp = &args, | |
1304 | .rpc_resp = NULL, | |
1305 | }; | |
1306 | ||
1307 | return rpc_call_sync(NFS_CLIENT(inode), &msg, 0); | |
1308 | } | |
1309 | ||
1310 | static int nfs4_proc_readlink(struct inode *inode, struct page *page, | |
1311 | unsigned int pgbase, unsigned int pglen) | |
1312 | { | |
1313 | struct nfs4_exception exception = { }; | |
1314 | int err; | |
1315 | do { | |
1316 | err = nfs4_handle_exception(NFS_SERVER(inode), | |
1317 | _nfs4_proc_readlink(inode, page, pgbase, pglen), | |
1318 | &exception); | |
1319 | } while (exception.retry); | |
1320 | return err; | |
1321 | } | |
1322 | ||
1323 | static int _nfs4_proc_read(struct nfs_read_data *rdata) | |
1324 | { | |
1325 | int flags = rdata->flags; | |
1326 | struct inode *inode = rdata->inode; | |
1327 | struct nfs_fattr *fattr = rdata->res.fattr; | |
1328 | struct nfs_server *server = NFS_SERVER(inode); | |
1329 | struct rpc_message msg = { | |
1330 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ], | |
1331 | .rpc_argp = &rdata->args, | |
1332 | .rpc_resp = &rdata->res, | |
1333 | .rpc_cred = rdata->cred, | |
1334 | }; | |
1335 | unsigned long timestamp = jiffies; | |
1336 | int status; | |
1337 | ||
1338 | dprintk("NFS call read %d @ %Ld\n", rdata->args.count, | |
1339 | (long long) rdata->args.offset); | |
1340 | ||
1341 | fattr->valid = 0; | |
1342 | status = rpc_call_sync(server->client, &msg, flags); | |
1343 | if (!status) | |
1344 | renew_lease(server, timestamp); | |
1345 | dprintk("NFS reply read: %d\n", status); | |
1346 | return status; | |
1347 | } | |
1348 | ||
1349 | static int nfs4_proc_read(struct nfs_read_data *rdata) | |
1350 | { | |
1351 | struct nfs4_exception exception = { }; | |
1352 | int err; | |
1353 | do { | |
1354 | err = nfs4_handle_exception(NFS_SERVER(rdata->inode), | |
1355 | _nfs4_proc_read(rdata), | |
1356 | &exception); | |
1357 | } while (exception.retry); | |
1358 | return err; | |
1359 | } | |
1360 | ||
1361 | static int _nfs4_proc_write(struct nfs_write_data *wdata) | |
1362 | { | |
1363 | int rpcflags = wdata->flags; | |
1364 | struct inode *inode = wdata->inode; | |
1365 | struct nfs_fattr *fattr = wdata->res.fattr; | |
1366 | struct nfs_server *server = NFS_SERVER(inode); | |
1367 | struct rpc_message msg = { | |
1368 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE], | |
1369 | .rpc_argp = &wdata->args, | |
1370 | .rpc_resp = &wdata->res, | |
1371 | .rpc_cred = wdata->cred, | |
1372 | }; | |
1373 | int status; | |
1374 | ||
1375 | dprintk("NFS call write %d @ %Ld\n", wdata->args.count, | |
1376 | (long long) wdata->args.offset); | |
1377 | ||
1378 | fattr->valid = 0; | |
1379 | status = rpc_call_sync(server->client, &msg, rpcflags); | |
1380 | dprintk("NFS reply write: %d\n", status); | |
1381 | return status; | |
1382 | } | |
1383 | ||
1384 | static int nfs4_proc_write(struct nfs_write_data *wdata) | |
1385 | { | |
1386 | struct nfs4_exception exception = { }; | |
1387 | int err; | |
1388 | do { | |
1389 | err = nfs4_handle_exception(NFS_SERVER(wdata->inode), | |
1390 | _nfs4_proc_write(wdata), | |
1391 | &exception); | |
1392 | } while (exception.retry); | |
1393 | return err; | |
1394 | } | |
1395 | ||
1396 | static int _nfs4_proc_commit(struct nfs_write_data *cdata) | |
1397 | { | |
1398 | struct inode *inode = cdata->inode; | |
1399 | struct nfs_fattr *fattr = cdata->res.fattr; | |
1400 | struct nfs_server *server = NFS_SERVER(inode); | |
1401 | struct rpc_message msg = { | |
1402 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], | |
1403 | .rpc_argp = &cdata->args, | |
1404 | .rpc_resp = &cdata->res, | |
1405 | .rpc_cred = cdata->cred, | |
1406 | }; | |
1407 | int status; | |
1408 | ||
1409 | dprintk("NFS call commit %d @ %Ld\n", cdata->args.count, | |
1410 | (long long) cdata->args.offset); | |
1411 | ||
1412 | fattr->valid = 0; | |
1413 | status = rpc_call_sync(server->client, &msg, 0); | |
1414 | dprintk("NFS reply commit: %d\n", status); | |
1415 | return status; | |
1416 | } | |
1417 | ||
1418 | static int nfs4_proc_commit(struct nfs_write_data *cdata) | |
1419 | { | |
1420 | struct nfs4_exception exception = { }; | |
1421 | int err; | |
1422 | do { | |
1423 | err = nfs4_handle_exception(NFS_SERVER(cdata->inode), | |
1424 | _nfs4_proc_commit(cdata), | |
1425 | &exception); | |
1426 | } while (exception.retry); | |
1427 | return err; | |
1428 | } | |
1429 | ||
1430 | /* | |
1431 | * Got race? | |
1432 | * We will need to arrange for the VFS layer to provide an atomic open. | |
1433 | * Until then, this create/open method is prone to inefficiency and race | |
1434 | * conditions due to the lookup, create, and open VFS calls from sys_open() | |
1435 | * placed on the wire. | |
1436 | * | |
1437 | * Given the above sorry state of affairs, I'm simply sending an OPEN. | |
1438 | * The file will be opened again in the subsequent VFS open call | |
1439 | * (nfs4_proc_file_open). | |
1440 | * | |
1441 | * The open for read will just hang around to be used by any process that | |
1442 | * opens the file O_RDONLY. This will all be resolved with the VFS changes. | |
1443 | */ | |
1444 | ||
1445 | static int | |
1446 | nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr, | |
1447 | int flags) | |
1448 | { | |
1449 | struct nfs4_state *state; | |
1450 | struct rpc_cred *cred; | |
1451 | int status = 0; | |
1452 | ||
1453 | cred = rpcauth_lookupcred(NFS_SERVER(dir)->client->cl_auth, 0); | |
1454 | if (IS_ERR(cred)) { | |
1455 | status = PTR_ERR(cred); | |
1456 | goto out; | |
1457 | } | |
1458 | state = nfs4_do_open(dir, dentry, flags, sattr, cred); | |
1459 | put_rpccred(cred); | |
1460 | if (IS_ERR(state)) { | |
1461 | status = PTR_ERR(state); | |
1462 | goto out; | |
1463 | } | |
1464 | d_instantiate(dentry, state->inode); | |
1465 | if (flags & O_EXCL) { | |
1466 | struct nfs_fattr fattr; | |
1467 | status = nfs4_do_setattr(NFS_SERVER(dir), &fattr, | |
1468 | NFS_FH(state->inode), sattr, state); | |
1469 | if (status == 0) | |
1470 | goto out; | |
1471 | } else if (flags != 0) | |
1472 | goto out; | |
1473 | nfs4_close_state(state, flags); | |
1474 | out: | |
1475 | return status; | |
1476 | } | |
1477 | ||
1478 | static int _nfs4_proc_remove(struct inode *dir, struct qstr *name) | |
1479 | { | |
1480 | struct nfs4_remove_arg args = { | |
1481 | .fh = NFS_FH(dir), | |
1482 | .name = name, | |
1483 | }; | |
1484 | struct nfs4_change_info res; | |
1485 | struct rpc_message msg = { | |
1486 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE], | |
1487 | .rpc_argp = &args, | |
1488 | .rpc_resp = &res, | |
1489 | }; | |
1490 | int status; | |
1491 | ||
1492 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
1493 | if (status == 0) | |
1494 | update_changeattr(dir, &res); | |
1495 | return status; | |
1496 | } | |
1497 | ||
1498 | static int nfs4_proc_remove(struct inode *dir, struct qstr *name) | |
1499 | { | |
1500 | struct nfs4_exception exception = { }; | |
1501 | int err; | |
1502 | do { | |
1503 | err = nfs4_handle_exception(NFS_SERVER(dir), | |
1504 | _nfs4_proc_remove(dir, name), | |
1505 | &exception); | |
1506 | } while (exception.retry); | |
1507 | return err; | |
1508 | } | |
1509 | ||
1510 | struct unlink_desc { | |
1511 | struct nfs4_remove_arg args; | |
1512 | struct nfs4_change_info res; | |
1513 | }; | |
1514 | ||
1515 | static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, | |
1516 | struct qstr *name) | |
1517 | { | |
1518 | struct unlink_desc *up; | |
1519 | ||
1520 | up = (struct unlink_desc *) kmalloc(sizeof(*up), GFP_KERNEL); | |
1521 | if (!up) | |
1522 | return -ENOMEM; | |
1523 | ||
1524 | up->args.fh = NFS_FH(dir->d_inode); | |
1525 | up->args.name = name; | |
1526 | ||
1527 | msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE]; | |
1528 | msg->rpc_argp = &up->args; | |
1529 | msg->rpc_resp = &up->res; | |
1530 | return 0; | |
1531 | } | |
1532 | ||
1533 | static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task) | |
1534 | { | |
1535 | struct rpc_message *msg = &task->tk_msg; | |
1536 | struct unlink_desc *up; | |
1537 | ||
1538 | if (msg->rpc_resp != NULL) { | |
1539 | up = container_of(msg->rpc_resp, struct unlink_desc, res); | |
1540 | update_changeattr(dir->d_inode, &up->res); | |
1541 | kfree(up); | |
1542 | msg->rpc_resp = NULL; | |
1543 | msg->rpc_argp = NULL; | |
1544 | } | |
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, | |
1549 | struct inode *new_dir, struct qstr *new_name) | |
1550 | { | |
1551 | struct nfs4_rename_arg arg = { | |
1552 | .old_dir = NFS_FH(old_dir), | |
1553 | .new_dir = NFS_FH(new_dir), | |
1554 | .old_name = old_name, | |
1555 | .new_name = new_name, | |
1556 | }; | |
1557 | struct nfs4_rename_res res = { }; | |
1558 | struct rpc_message msg = { | |
1559 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME], | |
1560 | .rpc_argp = &arg, | |
1561 | .rpc_resp = &res, | |
1562 | }; | |
1563 | int status; | |
1564 | ||
1565 | status = rpc_call_sync(NFS_CLIENT(old_dir), &msg, 0); | |
1566 | ||
1567 | if (!status) { | |
1568 | update_changeattr(old_dir, &res.old_cinfo); | |
1569 | update_changeattr(new_dir, &res.new_cinfo); | |
1570 | } | |
1571 | return status; | |
1572 | } | |
1573 | ||
1574 | static int nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name, | |
1575 | struct inode *new_dir, struct qstr *new_name) | |
1576 | { | |
1577 | struct nfs4_exception exception = { }; | |
1578 | int err; | |
1579 | do { | |
1580 | err = nfs4_handle_exception(NFS_SERVER(old_dir), | |
1581 | _nfs4_proc_rename(old_dir, old_name, | |
1582 | new_dir, new_name), | |
1583 | &exception); | |
1584 | } while (exception.retry); | |
1585 | return err; | |
1586 | } | |
1587 | ||
1588 | static int _nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) | |
1589 | { | |
1590 | struct nfs4_link_arg arg = { | |
1591 | .fh = NFS_FH(inode), | |
1592 | .dir_fh = NFS_FH(dir), | |
1593 | .name = name, | |
1594 | }; | |
1595 | struct nfs4_change_info cinfo = { }; | |
1596 | struct rpc_message msg = { | |
1597 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK], | |
1598 | .rpc_argp = &arg, | |
1599 | .rpc_resp = &cinfo, | |
1600 | }; | |
1601 | int status; | |
1602 | ||
1603 | status = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); | |
1604 | if (!status) | |
1605 | update_changeattr(dir, &cinfo); | |
1606 | ||
1607 | return status; | |
1608 | } | |
1609 | ||
1610 | static int nfs4_proc_link(struct inode *inode, struct inode *dir, struct qstr *name) | |
1611 | { | |
1612 | struct nfs4_exception exception = { }; | |
1613 | int err; | |
1614 | do { | |
1615 | err = nfs4_handle_exception(NFS_SERVER(inode), | |
1616 | _nfs4_proc_link(inode, dir, name), | |
1617 | &exception); | |
1618 | } while (exception.retry); | |
1619 | return err; | |
1620 | } | |
1621 | ||
1622 | static int _nfs4_proc_symlink(struct inode *dir, struct qstr *name, | |
1623 | struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle, | |
1624 | struct nfs_fattr *fattr) | |
1625 | { | |
1626 | struct nfs_server *server = NFS_SERVER(dir); | |
1627 | struct nfs4_create_arg arg = { | |
1628 | .dir_fh = NFS_FH(dir), | |
1629 | .server = server, | |
1630 | .name = name, | |
1631 | .attrs = sattr, | |
1632 | .ftype = NF4LNK, | |
1633 | .bitmask = server->attr_bitmask, | |
1634 | }; | |
1635 | struct nfs4_create_res res = { | |
1636 | .server = server, | |
1637 | .fh = fhandle, | |
1638 | .fattr = fattr, | |
1639 | }; | |
1640 | struct rpc_message msg = { | |
1641 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK], | |
1642 | .rpc_argp = &arg, | |
1643 | .rpc_resp = &res, | |
1644 | }; | |
1645 | int status; | |
1646 | ||
1647 | if (path->len > NFS4_MAXPATHLEN) | |
1648 | return -ENAMETOOLONG; | |
1649 | arg.u.symlink = path; | |
1650 | fattr->valid = 0; | |
1651 | ||
1652 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
1653 | if (!status) | |
1654 | update_changeattr(dir, &res.dir_cinfo); | |
1655 | return status; | |
1656 | } | |
1657 | ||
1658 | static int nfs4_proc_symlink(struct inode *dir, struct qstr *name, | |
1659 | struct qstr *path, struct iattr *sattr, struct nfs_fh *fhandle, | |
1660 | struct nfs_fattr *fattr) | |
1661 | { | |
1662 | struct nfs4_exception exception = { }; | |
1663 | int err; | |
1664 | do { | |
1665 | err = nfs4_handle_exception(NFS_SERVER(dir), | |
1666 | _nfs4_proc_symlink(dir, name, path, sattr, | |
1667 | fhandle, fattr), | |
1668 | &exception); | |
1669 | } while (exception.retry); | |
1670 | return err; | |
1671 | } | |
1672 | ||
1673 | static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, | |
1674 | struct iattr *sattr) | |
1675 | { | |
1676 | struct nfs_server *server = NFS_SERVER(dir); | |
1677 | struct nfs_fh fhandle; | |
1678 | struct nfs_fattr fattr; | |
1679 | struct nfs4_create_arg arg = { | |
1680 | .dir_fh = NFS_FH(dir), | |
1681 | .server = server, | |
1682 | .name = &dentry->d_name, | |
1683 | .attrs = sattr, | |
1684 | .ftype = NF4DIR, | |
1685 | .bitmask = server->attr_bitmask, | |
1686 | }; | |
1687 | struct nfs4_create_res res = { | |
1688 | .server = server, | |
1689 | .fh = &fhandle, | |
1690 | .fattr = &fattr, | |
1691 | }; | |
1692 | struct rpc_message msg = { | |
1693 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], | |
1694 | .rpc_argp = &arg, | |
1695 | .rpc_resp = &res, | |
1696 | }; | |
1697 | int status; | |
1698 | ||
1699 | fattr.valid = 0; | |
1700 | ||
1701 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
1702 | if (!status) { | |
1703 | update_changeattr(dir, &res.dir_cinfo); | |
1704 | status = nfs_instantiate(dentry, &fhandle, &fattr); | |
1705 | } | |
1706 | return status; | |
1707 | } | |
1708 | ||
1709 | static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry, | |
1710 | struct iattr *sattr) | |
1711 | { | |
1712 | struct nfs4_exception exception = { }; | |
1713 | int err; | |
1714 | do { | |
1715 | err = nfs4_handle_exception(NFS_SERVER(dir), | |
1716 | _nfs4_proc_mkdir(dir, dentry, sattr), | |
1717 | &exception); | |
1718 | } while (exception.retry); | |
1719 | return err; | |
1720 | } | |
1721 | ||
1722 | static int _nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, | |
1723 | u64 cookie, struct page *page, unsigned int count, int plus) | |
1724 | { | |
1725 | struct inode *dir = dentry->d_inode; | |
1726 | struct nfs4_readdir_arg args = { | |
1727 | .fh = NFS_FH(dir), | |
1728 | .pages = &page, | |
1729 | .pgbase = 0, | |
1730 | .count = count, | |
1731 | .bitmask = NFS_SERVER(dentry->d_inode)->attr_bitmask, | |
1732 | }; | |
1733 | struct nfs4_readdir_res res; | |
1734 | struct rpc_message msg = { | |
1735 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR], | |
1736 | .rpc_argp = &args, | |
1737 | .rpc_resp = &res, | |
1738 | .rpc_cred = cred, | |
1739 | }; | |
1740 | int status; | |
1741 | ||
1742 | lock_kernel(); | |
1743 | nfs4_setup_readdir(cookie, NFS_COOKIEVERF(dir), dentry, &args); | |
1744 | res.pgbase = args.pgbase; | |
1745 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
1746 | if (status == 0) | |
1747 | memcpy(NFS_COOKIEVERF(dir), res.verifier.data, NFS4_VERIFIER_SIZE); | |
1748 | unlock_kernel(); | |
1749 | return status; | |
1750 | } | |
1751 | ||
1752 | static int nfs4_proc_readdir(struct dentry *dentry, struct rpc_cred *cred, | |
1753 | u64 cookie, struct page *page, unsigned int count, int plus) | |
1754 | { | |
1755 | struct nfs4_exception exception = { }; | |
1756 | int err; | |
1757 | do { | |
1758 | err = nfs4_handle_exception(NFS_SERVER(dentry->d_inode), | |
1759 | _nfs4_proc_readdir(dentry, cred, cookie, | |
1760 | page, count, plus), | |
1761 | &exception); | |
1762 | } while (exception.retry); | |
1763 | return err; | |
1764 | } | |
1765 | ||
1766 | static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, | |
1767 | struct iattr *sattr, dev_t rdev) | |
1768 | { | |
1769 | struct nfs_server *server = NFS_SERVER(dir); | |
1770 | struct nfs_fh fh; | |
1771 | struct nfs_fattr fattr; | |
1772 | struct nfs4_create_arg arg = { | |
1773 | .dir_fh = NFS_FH(dir), | |
1774 | .server = server, | |
1775 | .name = &dentry->d_name, | |
1776 | .attrs = sattr, | |
1777 | .bitmask = server->attr_bitmask, | |
1778 | }; | |
1779 | struct nfs4_create_res res = { | |
1780 | .server = server, | |
1781 | .fh = &fh, | |
1782 | .fattr = &fattr, | |
1783 | }; | |
1784 | struct rpc_message msg = { | |
1785 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE], | |
1786 | .rpc_argp = &arg, | |
1787 | .rpc_resp = &res, | |
1788 | }; | |
1789 | int status; | |
1790 | int mode = sattr->ia_mode; | |
1791 | ||
1792 | fattr.valid = 0; | |
1793 | ||
1794 | BUG_ON(!(sattr->ia_valid & ATTR_MODE)); | |
1795 | BUG_ON(!S_ISFIFO(mode) && !S_ISBLK(mode) && !S_ISCHR(mode) && !S_ISSOCK(mode)); | |
1796 | if (S_ISFIFO(mode)) | |
1797 | arg.ftype = NF4FIFO; | |
1798 | else if (S_ISBLK(mode)) { | |
1799 | arg.ftype = NF4BLK; | |
1800 | arg.u.device.specdata1 = MAJOR(rdev); | |
1801 | arg.u.device.specdata2 = MINOR(rdev); | |
1802 | } | |
1803 | else if (S_ISCHR(mode)) { | |
1804 | arg.ftype = NF4CHR; | |
1805 | arg.u.device.specdata1 = MAJOR(rdev); | |
1806 | arg.u.device.specdata2 = MINOR(rdev); | |
1807 | } | |
1808 | else | |
1809 | arg.ftype = NF4SOCK; | |
1810 | ||
1811 | status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0); | |
1812 | if (status == 0) { | |
1813 | update_changeattr(dir, &res.dir_cinfo); | |
1814 | status = nfs_instantiate(dentry, &fh, &fattr); | |
1815 | } | |
1816 | return status; | |
1817 | } | |
1818 | ||
1819 | static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry, | |
1820 | struct iattr *sattr, dev_t rdev) | |
1821 | { | |
1822 | struct nfs4_exception exception = { }; | |
1823 | int err; | |
1824 | do { | |
1825 | err = nfs4_handle_exception(NFS_SERVER(dir), | |
1826 | _nfs4_proc_mknod(dir, dentry, sattr, rdev), | |
1827 | &exception); | |
1828 | } while (exception.retry); | |
1829 | return err; | |
1830 | } | |
1831 | ||
1832 | static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, | |
1833 | struct nfs_fsstat *fsstat) | |
1834 | { | |
1835 | struct nfs4_statfs_arg args = { | |
1836 | .fh = fhandle, | |
1837 | .bitmask = server->attr_bitmask, | |
1838 | }; | |
1839 | struct rpc_message msg = { | |
1840 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS], | |
1841 | .rpc_argp = &args, | |
1842 | .rpc_resp = fsstat, | |
1843 | }; | |
1844 | ||
1845 | fsstat->fattr->valid = 0; | |
1846 | return rpc_call_sync(server->client, &msg, 0); | |
1847 | } | |
1848 | ||
1849 | static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat) | |
1850 | { | |
1851 | struct nfs4_exception exception = { }; | |
1852 | int err; | |
1853 | do { | |
1854 | err = nfs4_handle_exception(server, | |
1855 | _nfs4_proc_statfs(server, fhandle, fsstat), | |
1856 | &exception); | |
1857 | } while (exception.retry); | |
1858 | return err; | |
1859 | } | |
1860 | ||
1861 | static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, | |
1862 | struct nfs_fsinfo *fsinfo) | |
1863 | { | |
1864 | struct nfs4_fsinfo_arg args = { | |
1865 | .fh = fhandle, | |
1866 | .bitmask = server->attr_bitmask, | |
1867 | }; | |
1868 | struct rpc_message msg = { | |
1869 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO], | |
1870 | .rpc_argp = &args, | |
1871 | .rpc_resp = fsinfo, | |
1872 | }; | |
1873 | ||
1874 | return rpc_call_sync(server->client, &msg, 0); | |
1875 | } | |
1876 | ||
1877 | static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) | |
1878 | { | |
1879 | struct nfs4_exception exception = { }; | |
1880 | int err; | |
1881 | ||
1882 | do { | |
1883 | err = nfs4_handle_exception(server, | |
1884 | _nfs4_do_fsinfo(server, fhandle, fsinfo), | |
1885 | &exception); | |
1886 | } while (exception.retry); | |
1887 | return err; | |
1888 | } | |
1889 | ||
1890 | static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo) | |
1891 | { | |
1892 | fsinfo->fattr->valid = 0; | |
1893 | return nfs4_do_fsinfo(server, fhandle, fsinfo); | |
1894 | } | |
1895 | ||
1896 | static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, | |
1897 | struct nfs_pathconf *pathconf) | |
1898 | { | |
1899 | struct nfs4_pathconf_arg args = { | |
1900 | .fh = fhandle, | |
1901 | .bitmask = server->attr_bitmask, | |
1902 | }; | |
1903 | struct rpc_message msg = { | |
1904 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF], | |
1905 | .rpc_argp = &args, | |
1906 | .rpc_resp = pathconf, | |
1907 | }; | |
1908 | ||
1909 | /* None of the pathconf attributes are mandatory to implement */ | |
1910 | if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) { | |
1911 | memset(pathconf, 0, sizeof(*pathconf)); | |
1912 | return 0; | |
1913 | } | |
1914 | ||
1915 | pathconf->fattr->valid = 0; | |
1916 | return rpc_call_sync(server->client, &msg, 0); | |
1917 | } | |
1918 | ||
1919 | static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle, | |
1920 | struct nfs_pathconf *pathconf) | |
1921 | { | |
1922 | struct nfs4_exception exception = { }; | |
1923 | int err; | |
1924 | ||
1925 | do { | |
1926 | err = nfs4_handle_exception(server, | |
1927 | _nfs4_proc_pathconf(server, fhandle, pathconf), | |
1928 | &exception); | |
1929 | } while (exception.retry); | |
1930 | return err; | |
1931 | } | |
1932 | ||
1933 | static void | |
1934 | nfs4_read_done(struct rpc_task *task) | |
1935 | { | |
1936 | struct nfs_read_data *data = (struct nfs_read_data *) task->tk_calldata; | |
1937 | struct inode *inode = data->inode; | |
1938 | ||
1939 | if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { | |
1940 | rpc_restart_call(task); | |
1941 | return; | |
1942 | } | |
1943 | if (task->tk_status > 0) | |
1944 | renew_lease(NFS_SERVER(inode), data->timestamp); | |
1945 | /* Call back common NFS readpage processing */ | |
1946 | nfs_readpage_result(task); | |
1947 | } | |
1948 | ||
1949 | static void | |
1950 | nfs4_proc_read_setup(struct nfs_read_data *data) | |
1951 | { | |
1952 | struct rpc_task *task = &data->task; | |
1953 | struct rpc_message msg = { | |
1954 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ], | |
1955 | .rpc_argp = &data->args, | |
1956 | .rpc_resp = &data->res, | |
1957 | .rpc_cred = data->cred, | |
1958 | }; | |
1959 | struct inode *inode = data->inode; | |
1960 | int flags; | |
1961 | ||
1962 | data->timestamp = jiffies; | |
1963 | ||
1964 | /* N.B. Do we need to test? Never called for swapfile inode */ | |
1965 | flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0); | |
1966 | ||
1967 | /* Finalize the task. */ | |
1968 | rpc_init_task(task, NFS_CLIENT(inode), nfs4_read_done, flags); | |
1969 | rpc_call_setup(task, &msg, 0); | |
1970 | } | |
1971 | ||
1972 | static void | |
1973 | nfs4_write_done(struct rpc_task *task) | |
1974 | { | |
1975 | struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata; | |
1976 | struct inode *inode = data->inode; | |
1977 | ||
1978 | if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { | |
1979 | rpc_restart_call(task); | |
1980 | return; | |
1981 | } | |
1982 | if (task->tk_status >= 0) | |
1983 | renew_lease(NFS_SERVER(inode), data->timestamp); | |
1984 | /* Call back common NFS writeback processing */ | |
1985 | nfs_writeback_done(task); | |
1986 | } | |
1987 | ||
1988 | static void | |
1989 | nfs4_proc_write_setup(struct nfs_write_data *data, int how) | |
1990 | { | |
1991 | struct rpc_task *task = &data->task; | |
1992 | struct rpc_message msg = { | |
1993 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE], | |
1994 | .rpc_argp = &data->args, | |
1995 | .rpc_resp = &data->res, | |
1996 | .rpc_cred = data->cred, | |
1997 | }; | |
1998 | struct inode *inode = data->inode; | |
1999 | int stable; | |
2000 | int flags; | |
2001 | ||
2002 | if (how & FLUSH_STABLE) { | |
2003 | if (!NFS_I(inode)->ncommit) | |
2004 | stable = NFS_FILE_SYNC; | |
2005 | else | |
2006 | stable = NFS_DATA_SYNC; | |
2007 | } else | |
2008 | stable = NFS_UNSTABLE; | |
2009 | data->args.stable = stable; | |
2010 | ||
2011 | data->timestamp = jiffies; | |
2012 | ||
2013 | /* Set the initial flags for the task. */ | |
2014 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
2015 | ||
2016 | /* Finalize the task. */ | |
2017 | rpc_init_task(task, NFS_CLIENT(inode), nfs4_write_done, flags); | |
2018 | rpc_call_setup(task, &msg, 0); | |
2019 | } | |
2020 | ||
2021 | static void | |
2022 | nfs4_commit_done(struct rpc_task *task) | |
2023 | { | |
2024 | struct nfs_write_data *data = (struct nfs_write_data *) task->tk_calldata; | |
2025 | struct inode *inode = data->inode; | |
2026 | ||
2027 | if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) { | |
2028 | rpc_restart_call(task); | |
2029 | return; | |
2030 | } | |
2031 | /* Call back common NFS writeback processing */ | |
2032 | nfs_commit_done(task); | |
2033 | } | |
2034 | ||
2035 | static void | |
2036 | nfs4_proc_commit_setup(struct nfs_write_data *data, int how) | |
2037 | { | |
2038 | struct rpc_task *task = &data->task; | |
2039 | struct rpc_message msg = { | |
2040 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT], | |
2041 | .rpc_argp = &data->args, | |
2042 | .rpc_resp = &data->res, | |
2043 | .rpc_cred = data->cred, | |
2044 | }; | |
2045 | struct inode *inode = data->inode; | |
2046 | int flags; | |
2047 | ||
2048 | /* Set the initial flags for the task. */ | |
2049 | flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
2050 | ||
2051 | /* Finalize the task. */ | |
2052 | rpc_init_task(task, NFS_CLIENT(inode), nfs4_commit_done, flags); | |
2053 | rpc_call_setup(task, &msg, 0); | |
2054 | } | |
2055 | ||
2056 | /* | |
2057 | * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special | |
2058 | * standalone procedure for queueing an asynchronous RENEW. | |
2059 | */ | |
2060 | static void | |
2061 | renew_done(struct rpc_task *task) | |
2062 | { | |
2063 | struct nfs4_client *clp = (struct nfs4_client *)task->tk_msg.rpc_argp; | |
2064 | unsigned long timestamp = (unsigned long)task->tk_calldata; | |
2065 | ||
2066 | if (task->tk_status < 0) { | |
2067 | switch (task->tk_status) { | |
2068 | case -NFS4ERR_STALE_CLIENTID: | |
2069 | case -NFS4ERR_EXPIRED: | |
2070 | case -NFS4ERR_CB_PATH_DOWN: | |
2071 | nfs4_schedule_state_recovery(clp); | |
2072 | } | |
2073 | return; | |
2074 | } | |
2075 | spin_lock(&clp->cl_lock); | |
2076 | if (time_before(clp->cl_last_renewal,timestamp)) | |
2077 | clp->cl_last_renewal = timestamp; | |
2078 | spin_unlock(&clp->cl_lock); | |
2079 | } | |
2080 | ||
2081 | int | |
2082 | nfs4_proc_async_renew(struct nfs4_client *clp) | |
2083 | { | |
2084 | struct rpc_message msg = { | |
2085 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], | |
2086 | .rpc_argp = clp, | |
2087 | .rpc_cred = clp->cl_cred, | |
2088 | }; | |
2089 | ||
2090 | return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_SOFT, | |
2091 | renew_done, (void *)jiffies); | |
2092 | } | |
2093 | ||
2094 | int | |
2095 | nfs4_proc_renew(struct nfs4_client *clp) | |
2096 | { | |
2097 | struct rpc_message msg = { | |
2098 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENEW], | |
2099 | .rpc_argp = clp, | |
2100 | .rpc_cred = clp->cl_cred, | |
2101 | }; | |
2102 | unsigned long now = jiffies; | |
2103 | int status; | |
2104 | ||
2105 | status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); | |
2106 | if (status < 0) | |
2107 | return status; | |
2108 | spin_lock(&clp->cl_lock); | |
2109 | if (time_before(clp->cl_last_renewal,now)) | |
2110 | clp->cl_last_renewal = now; | |
2111 | spin_unlock(&clp->cl_lock); | |
2112 | return 0; | |
2113 | } | |
2114 | ||
2115 | /* | |
2116 | * We will need to arrange for the VFS layer to provide an atomic open. | |
2117 | * Until then, this open method is prone to inefficiency and race conditions | |
2118 | * due to the lookup, potential create, and open VFS calls from sys_open() | |
2119 | * placed on the wire. | |
2120 | */ | |
2121 | static int | |
2122 | nfs4_proc_file_open(struct inode *inode, struct file *filp) | |
2123 | { | |
2124 | struct dentry *dentry = filp->f_dentry; | |
2125 | struct nfs_open_context *ctx; | |
2126 | struct nfs4_state *state = NULL; | |
2127 | struct rpc_cred *cred; | |
2128 | int status = -ENOMEM; | |
2129 | ||
2130 | dprintk("nfs4_proc_file_open: starting on (%.*s/%.*s)\n", | |
2131 | (int)dentry->d_parent->d_name.len, | |
2132 | dentry->d_parent->d_name.name, | |
2133 | (int)dentry->d_name.len, dentry->d_name.name); | |
2134 | ||
2135 | ||
2136 | /* Find our open stateid */ | |
2137 | cred = rpcauth_lookupcred(NFS_SERVER(inode)->client->cl_auth, 0); | |
2138 | if (IS_ERR(cred)) | |
2139 | return PTR_ERR(cred); | |
2140 | ctx = alloc_nfs_open_context(dentry, cred); | |
2141 | put_rpccred(cred); | |
2142 | if (unlikely(ctx == NULL)) | |
2143 | return -ENOMEM; | |
2144 | status = -EIO; /* ERACE actually */ | |
2145 | state = nfs4_find_state(inode, cred, filp->f_mode); | |
2146 | if (unlikely(state == NULL)) | |
2147 | goto no_state; | |
2148 | ctx->state = state; | |
2149 | nfs4_close_state(state, filp->f_mode); | |
2150 | ctx->mode = filp->f_mode; | |
2151 | nfs_file_set_open_context(filp, ctx); | |
2152 | put_nfs_open_context(ctx); | |
2153 | if (filp->f_mode & FMODE_WRITE) | |
2154 | nfs_begin_data_update(inode); | |
2155 | return 0; | |
2156 | no_state: | |
2157 | printk(KERN_WARNING "NFS: v4 raced in function %s\n", __FUNCTION__); | |
2158 | put_nfs_open_context(ctx); | |
2159 | return status; | |
2160 | } | |
2161 | ||
2162 | /* | |
2163 | * Release our state | |
2164 | */ | |
2165 | static int | |
2166 | nfs4_proc_file_release(struct inode *inode, struct file *filp) | |
2167 | { | |
2168 | if (filp->f_mode & FMODE_WRITE) | |
2169 | nfs_end_data_update(inode); | |
2170 | nfs_file_clear_open_context(filp); | |
2171 | return 0; | |
2172 | } | |
2173 | ||
aa1870af BF |
2174 | static inline int nfs4_server_supports_acls(struct nfs_server *server) |
2175 | { | |
2176 | return (server->caps & NFS_CAP_ACLS) | |
2177 | && (server->acl_bitmask & ACL4_SUPPORT_ALLOW_ACL) | |
2178 | && (server->acl_bitmask & ACL4_SUPPORT_DENY_ACL); | |
2179 | } | |
2180 | ||
2181 | /* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_CACHE_SIZE, and that | |
2182 | * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_CACHE_SIZE) bytes on | |
2183 | * the stack. | |
2184 | */ | |
2185 | #define NFS4ACL_MAXPAGES (XATTR_SIZE_MAX >> PAGE_CACHE_SHIFT) | |
2186 | ||
2187 | static void buf_to_pages(const void *buf, size_t buflen, | |
2188 | struct page **pages, unsigned int *pgbase) | |
2189 | { | |
2190 | const void *p = buf; | |
2191 | ||
2192 | *pgbase = offset_in_page(buf); | |
2193 | p -= *pgbase; | |
2194 | while (p < buf + buflen) { | |
2195 | *(pages++) = virt_to_page(p); | |
2196 | p += PAGE_CACHE_SIZE; | |
2197 | } | |
2198 | } | |
2199 | ||
e50a1c2e BF |
2200 | struct nfs4_cached_acl { |
2201 | int cached; | |
2202 | size_t len; | |
3e9d4154 | 2203 | char data[0]; |
e50a1c2e BF |
2204 | }; |
2205 | ||
2206 | static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl) | |
2207 | { | |
2208 | struct nfs_inode *nfsi = NFS_I(inode); | |
2209 | ||
2210 | spin_lock(&inode->i_lock); | |
2211 | kfree(nfsi->nfs4_acl); | |
2212 | nfsi->nfs4_acl = acl; | |
2213 | spin_unlock(&inode->i_lock); | |
2214 | } | |
2215 | ||
2216 | static void nfs4_zap_acl_attr(struct inode *inode) | |
2217 | { | |
2218 | nfs4_set_cached_acl(inode, NULL); | |
2219 | } | |
2220 | ||
2221 | static inline ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf, size_t buflen) | |
2222 | { | |
2223 | struct nfs_inode *nfsi = NFS_I(inode); | |
2224 | struct nfs4_cached_acl *acl; | |
2225 | int ret = -ENOENT; | |
2226 | ||
2227 | spin_lock(&inode->i_lock); | |
2228 | acl = nfsi->nfs4_acl; | |
2229 | if (acl == NULL) | |
2230 | goto out; | |
2231 | if (buf == NULL) /* user is just asking for length */ | |
2232 | goto out_len; | |
2233 | if (acl->cached == 0) | |
2234 | goto out; | |
2235 | ret = -ERANGE; /* see getxattr(2) man page */ | |
2236 | if (acl->len > buflen) | |
2237 | goto out; | |
2238 | memcpy(buf, acl->data, acl->len); | |
2239 | out_len: | |
2240 | ret = acl->len; | |
2241 | out: | |
2242 | spin_unlock(&inode->i_lock); | |
2243 | return ret; | |
2244 | } | |
2245 | ||
2246 | static void nfs4_write_cached_acl(struct inode *inode, const char *buf, size_t acl_len) | |
2247 | { | |
2248 | struct nfs4_cached_acl *acl; | |
2249 | ||
2250 | if (buf && acl_len <= PAGE_SIZE) { | |
2251 | acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL); | |
2252 | if (acl == NULL) | |
2253 | goto out; | |
2254 | acl->cached = 1; | |
2255 | memcpy(acl->data, buf, acl_len); | |
2256 | } else { | |
2257 | acl = kmalloc(sizeof(*acl), GFP_KERNEL); | |
2258 | if (acl == NULL) | |
2259 | goto out; | |
2260 | acl->cached = 0; | |
2261 | } | |
2262 | acl->len = acl_len; | |
2263 | out: | |
2264 | nfs4_set_cached_acl(inode, acl); | |
2265 | } | |
2266 | ||
2267 | static inline ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf, size_t buflen) | |
aa1870af | 2268 | { |
aa1870af BF |
2269 | struct page *pages[NFS4ACL_MAXPAGES]; |
2270 | struct nfs_getaclargs args = { | |
2271 | .fh = NFS_FH(inode), | |
2272 | .acl_pages = pages, | |
2273 | .acl_len = buflen, | |
2274 | }; | |
2275 | size_t resp_len = buflen; | |
e50a1c2e | 2276 | void *resp_buf; |
aa1870af BF |
2277 | struct rpc_message msg = { |
2278 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL], | |
2279 | .rpc_argp = &args, | |
2280 | .rpc_resp = &resp_len, | |
2281 | }; | |
e50a1c2e | 2282 | struct page *localpage = NULL; |
aa1870af BF |
2283 | int ret; |
2284 | ||
e50a1c2e BF |
2285 | if (buflen < PAGE_SIZE) { |
2286 | /* As long as we're doing a round trip to the server anyway, | |
2287 | * let's be prepared for a page of acl data. */ | |
2288 | localpage = alloc_page(GFP_KERNEL); | |
2289 | resp_buf = page_address(localpage); | |
2290 | if (localpage == NULL) | |
2291 | return -ENOMEM; | |
2292 | args.acl_pages[0] = localpage; | |
2293 | args.acl_pgbase = 0; | |
2294 | args.acl_len = PAGE_SIZE; | |
2295 | } else { | |
2296 | resp_buf = buf; | |
2297 | buf_to_pages(buf, buflen, args.acl_pages, &args.acl_pgbase); | |
2298 | } | |
aa1870af | 2299 | ret = rpc_call_sync(NFS_CLIENT(inode), &msg, 0); |
e50a1c2e BF |
2300 | if (ret) |
2301 | goto out_free; | |
2302 | if (resp_len > args.acl_len) | |
2303 | nfs4_write_cached_acl(inode, NULL, resp_len); | |
2304 | else | |
2305 | nfs4_write_cached_acl(inode, resp_buf, resp_len); | |
2306 | if (buf) { | |
2307 | ret = -ERANGE; | |
2308 | if (resp_len > buflen) | |
2309 | goto out_free; | |
2310 | if (localpage) | |
2311 | memcpy(buf, resp_buf, resp_len); | |
2312 | } | |
2313 | ret = resp_len; | |
2314 | out_free: | |
2315 | if (localpage) | |
2316 | __free_page(localpage); | |
aa1870af BF |
2317 | return ret; |
2318 | } | |
2319 | ||
e50a1c2e BF |
2320 | static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen) |
2321 | { | |
2322 | struct nfs_server *server = NFS_SERVER(inode); | |
2323 | int ret; | |
2324 | ||
2325 | if (!nfs4_server_supports_acls(server)) | |
2326 | return -EOPNOTSUPP; | |
2327 | ret = nfs_revalidate_inode(server, inode); | |
2328 | if (ret < 0) | |
2329 | return ret; | |
2330 | ret = nfs4_read_cached_acl(inode, buf, buflen); | |
2331 | if (ret != -ENOENT) | |
2332 | return ret; | |
2333 | return nfs4_get_acl_uncached(inode, buf, buflen); | |
2334 | } | |
2335 | ||
4b580ee3 BF |
2336 | static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen) |
2337 | { | |
2338 | struct nfs_server *server = NFS_SERVER(inode); | |
2339 | struct page *pages[NFS4ACL_MAXPAGES]; | |
2340 | struct nfs_setaclargs arg = { | |
2341 | .fh = NFS_FH(inode), | |
2342 | .acl_pages = pages, | |
2343 | .acl_len = buflen, | |
2344 | }; | |
2345 | struct rpc_message msg = { | |
2346 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETACL], | |
2347 | .rpc_argp = &arg, | |
2348 | .rpc_resp = NULL, | |
2349 | }; | |
2350 | int ret; | |
2351 | ||
2352 | if (!nfs4_server_supports_acls(server)) | |
2353 | return -EOPNOTSUPP; | |
2354 | buf_to_pages(buf, buflen, arg.acl_pages, &arg.acl_pgbase); | |
2355 | ret = rpc_call_sync(NFS_SERVER(inode)->client, &msg, 0); | |
e50a1c2e BF |
2356 | if (ret == 0) |
2357 | nfs4_write_cached_acl(inode, buf, buflen); | |
4b580ee3 BF |
2358 | return ret; |
2359 | } | |
2360 | ||
1da177e4 LT |
2361 | static int |
2362 | nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server) | |
2363 | { | |
2364 | struct nfs4_client *clp = server->nfs4_state; | |
2365 | ||
2366 | if (!clp || task->tk_status >= 0) | |
2367 | return 0; | |
2368 | switch(task->tk_status) { | |
2369 | case -NFS4ERR_STALE_CLIENTID: | |
2370 | case -NFS4ERR_STALE_STATEID: | |
2371 | case -NFS4ERR_EXPIRED: | |
2372 | rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL, NULL); | |
2373 | nfs4_schedule_state_recovery(clp); | |
2374 | if (test_bit(NFS4CLNT_OK, &clp->cl_state)) | |
2375 | rpc_wake_up_task(task); | |
2376 | task->tk_status = 0; | |
2377 | return -EAGAIN; | |
2378 | case -NFS4ERR_GRACE: | |
2379 | case -NFS4ERR_DELAY: | |
2380 | rpc_delay(task, NFS4_POLL_RETRY_MAX); | |
2381 | task->tk_status = 0; | |
2382 | return -EAGAIN; | |
2383 | case -NFS4ERR_OLD_STATEID: | |
2384 | task->tk_status = 0; | |
2385 | return -EAGAIN; | |
2386 | } | |
2387 | task->tk_status = nfs4_map_errors(task->tk_status); | |
2388 | return 0; | |
2389 | } | |
2390 | ||
2391 | static int nfs4_wait_clnt_recover(struct rpc_clnt *clnt, struct nfs4_client *clp) | |
2392 | { | |
2393 | DEFINE_WAIT(wait); | |
2394 | sigset_t oldset; | |
2395 | int interruptible, res = 0; | |
2396 | ||
2397 | might_sleep(); | |
2398 | ||
2399 | rpc_clnt_sigmask(clnt, &oldset); | |
2400 | interruptible = TASK_UNINTERRUPTIBLE; | |
2401 | if (clnt->cl_intr) | |
2402 | interruptible = TASK_INTERRUPTIBLE; | |
2403 | prepare_to_wait(&clp->cl_waitq, &wait, interruptible); | |
2404 | nfs4_schedule_state_recovery(clp); | |
2405 | if (clnt->cl_intr && signalled()) | |
2406 | res = -ERESTARTSYS; | |
2407 | else if (!test_bit(NFS4CLNT_OK, &clp->cl_state)) | |
2408 | schedule(); | |
2409 | finish_wait(&clp->cl_waitq, &wait); | |
2410 | rpc_clnt_sigunmask(clnt, &oldset); | |
2411 | return res; | |
2412 | } | |
2413 | ||
2414 | static int nfs4_delay(struct rpc_clnt *clnt, long *timeout) | |
2415 | { | |
2416 | sigset_t oldset; | |
2417 | int res = 0; | |
2418 | ||
2419 | might_sleep(); | |
2420 | ||
2421 | if (*timeout <= 0) | |
2422 | *timeout = NFS4_POLL_RETRY_MIN; | |
2423 | if (*timeout > NFS4_POLL_RETRY_MAX) | |
2424 | *timeout = NFS4_POLL_RETRY_MAX; | |
2425 | rpc_clnt_sigmask(clnt, &oldset); | |
2426 | if (clnt->cl_intr) { | |
2427 | set_current_state(TASK_INTERRUPTIBLE); | |
2428 | schedule_timeout(*timeout); | |
2429 | if (signalled()) | |
2430 | res = -ERESTARTSYS; | |
2431 | } else { | |
2432 | set_current_state(TASK_UNINTERRUPTIBLE); | |
2433 | schedule_timeout(*timeout); | |
2434 | } | |
2435 | rpc_clnt_sigunmask(clnt, &oldset); | |
2436 | *timeout <<= 1; | |
2437 | return res; | |
2438 | } | |
2439 | ||
2440 | /* This is the error handling routine for processes that are allowed | |
2441 | * to sleep. | |
2442 | */ | |
2443 | int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception) | |
2444 | { | |
2445 | struct nfs4_client *clp = server->nfs4_state; | |
2446 | int ret = errorcode; | |
2447 | ||
2448 | exception->retry = 0; | |
2449 | switch(errorcode) { | |
2450 | case 0: | |
2451 | return 0; | |
2452 | case -NFS4ERR_STALE_CLIENTID: | |
2453 | case -NFS4ERR_STALE_STATEID: | |
2454 | case -NFS4ERR_EXPIRED: | |
2455 | ret = nfs4_wait_clnt_recover(server->client, clp); | |
2456 | if (ret == 0) | |
2457 | exception->retry = 1; | |
2458 | break; | |
2459 | case -NFS4ERR_GRACE: | |
2460 | case -NFS4ERR_DELAY: | |
2461 | ret = nfs4_delay(server->client, &exception->timeout); | |
2462 | if (ret == 0) | |
2463 | exception->retry = 1; | |
2464 | break; | |
2465 | case -NFS4ERR_OLD_STATEID: | |
2466 | if (ret == 0) | |
2467 | exception->retry = 1; | |
2468 | } | |
2469 | /* We failed to handle the error */ | |
2470 | return nfs4_map_errors(ret); | |
2471 | } | |
2472 | ||
2473 | int nfs4_proc_setclientid(struct nfs4_client *clp, u32 program, unsigned short port) | |
2474 | { | |
2475 | nfs4_verifier sc_verifier; | |
2476 | struct nfs4_setclientid setclientid = { | |
2477 | .sc_verifier = &sc_verifier, | |
2478 | .sc_prog = program, | |
2479 | }; | |
2480 | struct rpc_message msg = { | |
2481 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID], | |
2482 | .rpc_argp = &setclientid, | |
2483 | .rpc_resp = clp, | |
2484 | .rpc_cred = clp->cl_cred, | |
2485 | }; | |
2486 | u32 *p; | |
2487 | int loop = 0; | |
2488 | int status; | |
2489 | ||
2490 | p = (u32*)sc_verifier.data; | |
2491 | *p++ = htonl((u32)clp->cl_boot_time.tv_sec); | |
2492 | *p = htonl((u32)clp->cl_boot_time.tv_nsec); | |
2493 | ||
2494 | for(;;) { | |
2495 | setclientid.sc_name_len = scnprintf(setclientid.sc_name, | |
2496 | sizeof(setclientid.sc_name), "%s/%u.%u.%u.%u %s %u", | |
2497 | clp->cl_ipaddr, NIPQUAD(clp->cl_addr.s_addr), | |
2498 | clp->cl_cred->cr_ops->cr_name, | |
2499 | clp->cl_id_uniquifier); | |
2500 | setclientid.sc_netid_len = scnprintf(setclientid.sc_netid, | |
2501 | sizeof(setclientid.sc_netid), "tcp"); | |
2502 | setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr, | |
2503 | sizeof(setclientid.sc_uaddr), "%s.%d.%d", | |
2504 | clp->cl_ipaddr, port >> 8, port & 255); | |
2505 | ||
2506 | status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); | |
2507 | if (status != -NFS4ERR_CLID_INUSE) | |
2508 | break; | |
2509 | if (signalled()) | |
2510 | break; | |
2511 | if (loop++ & 1) | |
2512 | ssleep(clp->cl_lease_time + 1); | |
2513 | else | |
2514 | if (++clp->cl_id_uniquifier == 0) | |
2515 | break; | |
2516 | } | |
2517 | return status; | |
2518 | } | |
2519 | ||
2520 | int | |
2521 | nfs4_proc_setclientid_confirm(struct nfs4_client *clp) | |
2522 | { | |
2523 | struct nfs_fsinfo fsinfo; | |
2524 | struct rpc_message msg = { | |
2525 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM], | |
2526 | .rpc_argp = clp, | |
2527 | .rpc_resp = &fsinfo, | |
2528 | .rpc_cred = clp->cl_cred, | |
2529 | }; | |
2530 | unsigned long now; | |
2531 | int status; | |
2532 | ||
2533 | now = jiffies; | |
2534 | status = rpc_call_sync(clp->cl_rpcclient, &msg, 0); | |
2535 | if (status == 0) { | |
2536 | spin_lock(&clp->cl_lock); | |
2537 | clp->cl_lease_time = fsinfo.lease_time * HZ; | |
2538 | clp->cl_last_renewal = now; | |
2539 | spin_unlock(&clp->cl_lock); | |
2540 | } | |
2541 | return status; | |
2542 | } | |
2543 | ||
2544 | static int _nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid) | |
2545 | { | |
2546 | struct nfs4_delegreturnargs args = { | |
2547 | .fhandle = NFS_FH(inode), | |
2548 | .stateid = stateid, | |
2549 | }; | |
2550 | struct rpc_message msg = { | |
2551 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN], | |
2552 | .rpc_argp = &args, | |
2553 | .rpc_cred = cred, | |
2554 | }; | |
2555 | ||
2556 | return rpc_call_sync(NFS_CLIENT(inode), &msg, 0); | |
2557 | } | |
2558 | ||
2559 | int nfs4_proc_delegreturn(struct inode *inode, struct rpc_cred *cred, const nfs4_stateid *stateid) | |
2560 | { | |
2561 | struct nfs_server *server = NFS_SERVER(inode); | |
2562 | struct nfs4_exception exception = { }; | |
2563 | int err; | |
2564 | do { | |
2565 | err = _nfs4_proc_delegreturn(inode, cred, stateid); | |
2566 | switch (err) { | |
2567 | case -NFS4ERR_STALE_STATEID: | |
2568 | case -NFS4ERR_EXPIRED: | |
2569 | nfs4_schedule_state_recovery(server->nfs4_state); | |
2570 | case 0: | |
2571 | return 0; | |
2572 | } | |
2573 | err = nfs4_handle_exception(server, err, &exception); | |
2574 | } while (exception.retry); | |
2575 | return err; | |
2576 | } | |
2577 | ||
2578 | #define NFS4_LOCK_MINTIMEOUT (1 * HZ) | |
2579 | #define NFS4_LOCK_MAXTIMEOUT (30 * HZ) | |
2580 | ||
2581 | /* | |
2582 | * sleep, with exponential backoff, and retry the LOCK operation. | |
2583 | */ | |
2584 | static unsigned long | |
2585 | nfs4_set_lock_task_retry(unsigned long timeout) | |
2586 | { | |
2587 | current->state = TASK_INTERRUPTIBLE; | |
2588 | schedule_timeout(timeout); | |
2589 | timeout <<= 1; | |
2590 | if (timeout > NFS4_LOCK_MAXTIMEOUT) | |
2591 | return NFS4_LOCK_MAXTIMEOUT; | |
2592 | return timeout; | |
2593 | } | |
2594 | ||
2595 | static inline int | |
2596 | nfs4_lck_type(int cmd, struct file_lock *request) | |
2597 | { | |
2598 | /* set lock type */ | |
2599 | switch (request->fl_type) { | |
2600 | case F_RDLCK: | |
2601 | return IS_SETLKW(cmd) ? NFS4_READW_LT : NFS4_READ_LT; | |
2602 | case F_WRLCK: | |
2603 | return IS_SETLKW(cmd) ? NFS4_WRITEW_LT : NFS4_WRITE_LT; | |
2604 | case F_UNLCK: | |
2605 | return NFS4_WRITE_LT; | |
2606 | } | |
2607 | BUG(); | |
2608 | return 0; | |
2609 | } | |
2610 | ||
2611 | static inline uint64_t | |
2612 | nfs4_lck_length(struct file_lock *request) | |
2613 | { | |
2614 | if (request->fl_end == OFFSET_MAX) | |
2615 | return ~(uint64_t)0; | |
2616 | return request->fl_end - request->fl_start + 1; | |
2617 | } | |
2618 | ||
2619 | static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) | |
2620 | { | |
2621 | struct inode *inode = state->inode; | |
2622 | struct nfs_server *server = NFS_SERVER(inode); | |
2623 | struct nfs4_client *clp = server->nfs4_state; | |
2624 | struct nfs_lockargs arg = { | |
2625 | .fh = NFS_FH(inode), | |
2626 | .type = nfs4_lck_type(cmd, request), | |
2627 | .offset = request->fl_start, | |
2628 | .length = nfs4_lck_length(request), | |
2629 | }; | |
2630 | struct nfs_lockres res = { | |
2631 | .server = server, | |
2632 | }; | |
2633 | struct rpc_message msg = { | |
2634 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKT], | |
2635 | .rpc_argp = &arg, | |
2636 | .rpc_resp = &res, | |
2637 | .rpc_cred = state->owner->so_cred, | |
2638 | }; | |
2639 | struct nfs_lowner nlo; | |
2640 | struct nfs4_lock_state *lsp; | |
2641 | int status; | |
2642 | ||
2643 | down_read(&clp->cl_sem); | |
2644 | nlo.clientid = clp->cl_clientid; | |
2645 | down(&state->lock_sema); | |
2646 | lsp = nfs4_find_lock_state(state, request->fl_owner); | |
2647 | if (lsp) | |
2648 | nlo.id = lsp->ls_id; | |
2649 | else { | |
2650 | spin_lock(&clp->cl_lock); | |
2651 | nlo.id = nfs4_alloc_lockowner_id(clp); | |
2652 | spin_unlock(&clp->cl_lock); | |
2653 | } | |
2654 | arg.u.lockt = &nlo; | |
2655 | status = rpc_call_sync(server->client, &msg, 0); | |
2656 | if (!status) { | |
2657 | request->fl_type = F_UNLCK; | |
2658 | } else if (status == -NFS4ERR_DENIED) { | |
2659 | int64_t len, start, end; | |
2660 | start = res.u.denied.offset; | |
2661 | len = res.u.denied.length; | |
2662 | end = start + len - 1; | |
2663 | if (end < 0 || len == 0) | |
2664 | request->fl_end = OFFSET_MAX; | |
2665 | else | |
2666 | request->fl_end = (loff_t)end; | |
2667 | request->fl_start = (loff_t)start; | |
2668 | request->fl_type = F_WRLCK; | |
2669 | if (res.u.denied.type & 1) | |
2670 | request->fl_type = F_RDLCK; | |
2671 | request->fl_pid = 0; | |
2672 | status = 0; | |
2673 | } | |
2674 | if (lsp) | |
2675 | nfs4_put_lock_state(lsp); | |
2676 | up(&state->lock_sema); | |
2677 | up_read(&clp->cl_sem); | |
2678 | return status; | |
2679 | } | |
2680 | ||
2681 | static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request) | |
2682 | { | |
2683 | struct nfs4_exception exception = { }; | |
2684 | int err; | |
2685 | ||
2686 | do { | |
2687 | err = nfs4_handle_exception(NFS_SERVER(state->inode), | |
2688 | _nfs4_proc_getlk(state, cmd, request), | |
2689 | &exception); | |
2690 | } while (exception.retry); | |
2691 | return err; | |
2692 | } | |
2693 | ||
2694 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
2695 | { | |
2696 | int res = 0; | |
2697 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
2698 | case FL_POSIX: | |
2699 | res = posix_lock_file_wait(file, fl); | |
2700 | break; | |
2701 | case FL_FLOCK: | |
2702 | res = flock_lock_file_wait(file, fl); | |
2703 | break; | |
2704 | default: | |
2705 | BUG(); | |
2706 | } | |
2707 | if (res < 0) | |
2708 | printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", | |
2709 | __FUNCTION__); | |
2710 | return res; | |
2711 | } | |
2712 | ||
2713 | static int _nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) | |
2714 | { | |
2715 | struct inode *inode = state->inode; | |
2716 | struct nfs_server *server = NFS_SERVER(inode); | |
2717 | struct nfs4_client *clp = server->nfs4_state; | |
2718 | struct nfs_lockargs arg = { | |
2719 | .fh = NFS_FH(inode), | |
2720 | .type = nfs4_lck_type(cmd, request), | |
2721 | .offset = request->fl_start, | |
2722 | .length = nfs4_lck_length(request), | |
2723 | }; | |
2724 | struct nfs_lockres res = { | |
2725 | .server = server, | |
2726 | }; | |
2727 | struct rpc_message msg = { | |
2728 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU], | |
2729 | .rpc_argp = &arg, | |
2730 | .rpc_resp = &res, | |
2731 | .rpc_cred = state->owner->so_cred, | |
2732 | }; | |
2733 | struct nfs4_lock_state *lsp; | |
2734 | struct nfs_locku_opargs luargs; | |
2735 | int status = 0; | |
2736 | ||
2737 | down_read(&clp->cl_sem); | |
2738 | down(&state->lock_sema); | |
2739 | lsp = nfs4_find_lock_state(state, request->fl_owner); | |
2740 | if (!lsp) | |
2741 | goto out; | |
2742 | /* We might have lost the locks! */ | |
2743 | if ((lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) { | |
2744 | luargs.seqid = lsp->ls_seqid; | |
2745 | memcpy(&luargs.stateid, &lsp->ls_stateid, sizeof(luargs.stateid)); | |
2746 | arg.u.locku = &luargs; | |
2747 | status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); | |
2748 | nfs4_increment_lock_seqid(status, lsp); | |
2749 | } | |
2750 | ||
2751 | if (status == 0) { | |
2752 | memcpy(&lsp->ls_stateid, &res.u.stateid, | |
2753 | sizeof(lsp->ls_stateid)); | |
2754 | nfs4_notify_unlck(state, request, lsp); | |
2755 | } | |
2756 | nfs4_put_lock_state(lsp); | |
2757 | out: | |
2758 | up(&state->lock_sema); | |
2759 | if (status == 0) | |
2760 | do_vfs_lock(request->fl_file, request); | |
2761 | up_read(&clp->cl_sem); | |
2762 | return status; | |
2763 | } | |
2764 | ||
2765 | static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request) | |
2766 | { | |
2767 | struct nfs4_exception exception = { }; | |
2768 | int err; | |
2769 | ||
2770 | do { | |
2771 | err = nfs4_handle_exception(NFS_SERVER(state->inode), | |
2772 | _nfs4_proc_unlck(state, cmd, request), | |
2773 | &exception); | |
2774 | } while (exception.retry); | |
2775 | return err; | |
2776 | } | |
2777 | ||
2778 | static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *request, int reclaim) | |
2779 | { | |
2780 | struct inode *inode = state->inode; | |
2781 | struct nfs_server *server = NFS_SERVER(inode); | |
2782 | struct nfs4_lock_state *lsp; | |
2783 | struct nfs_lockargs arg = { | |
2784 | .fh = NFS_FH(inode), | |
2785 | .type = nfs4_lck_type(cmd, request), | |
2786 | .offset = request->fl_start, | |
2787 | .length = nfs4_lck_length(request), | |
2788 | }; | |
2789 | struct nfs_lockres res = { | |
2790 | .server = server, | |
2791 | }; | |
2792 | struct rpc_message msg = { | |
2793 | .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK], | |
2794 | .rpc_argp = &arg, | |
2795 | .rpc_resp = &res, | |
2796 | .rpc_cred = state->owner->so_cred, | |
2797 | }; | |
2798 | struct nfs_lock_opargs largs = { | |
2799 | .reclaim = reclaim, | |
2800 | .new_lock_owner = 0, | |
2801 | }; | |
2802 | int status; | |
2803 | ||
2804 | lsp = nfs4_get_lock_state(state, request->fl_owner); | |
2805 | if (lsp == NULL) | |
2806 | return -ENOMEM; | |
2807 | if (!(lsp->ls_flags & NFS_LOCK_INITIALIZED)) { | |
2808 | struct nfs4_state_owner *owner = state->owner; | |
2809 | struct nfs_open_to_lock otl = { | |
2810 | .lock_owner = { | |
2811 | .clientid = server->nfs4_state->cl_clientid, | |
2812 | }, | |
2813 | }; | |
2814 | ||
2815 | otl.lock_seqid = lsp->ls_seqid; | |
2816 | otl.lock_owner.id = lsp->ls_id; | |
2817 | memcpy(&otl.open_stateid, &state->stateid, sizeof(otl.open_stateid)); | |
2818 | largs.u.open_lock = &otl; | |
2819 | largs.new_lock_owner = 1; | |
2820 | arg.u.lock = &largs; | |
2821 | down(&owner->so_sema); | |
2822 | otl.open_seqid = owner->so_seqid; | |
2823 | status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); | |
2824 | /* increment open_owner seqid on success, and | |
2825 | * seqid mutating errors */ | |
2826 | nfs4_increment_seqid(status, owner); | |
2827 | up(&owner->so_sema); | |
2828 | } else { | |
2829 | struct nfs_exist_lock el = { | |
2830 | .seqid = lsp->ls_seqid, | |
2831 | }; | |
2832 | memcpy(&el.stateid, &lsp->ls_stateid, sizeof(el.stateid)); | |
2833 | largs.u.exist_lock = ⪙ | |
2834 | largs.new_lock_owner = 0; | |
2835 | arg.u.lock = &largs; | |
2836 | status = rpc_call_sync(server->client, &msg, RPC_TASK_NOINTR); | |
2837 | } | |
2838 | /* increment seqid on success, and * seqid mutating errors*/ | |
2839 | nfs4_increment_lock_seqid(status, lsp); | |
2840 | /* save the returned stateid. */ | |
2841 | if (status == 0) { | |
2842 | memcpy(&lsp->ls_stateid, &res.u.stateid, sizeof(nfs4_stateid)); | |
2843 | lsp->ls_flags |= NFS_LOCK_INITIALIZED; | |
2844 | if (!reclaim) | |
2845 | nfs4_notify_setlk(state, request, lsp); | |
2846 | } else if (status == -NFS4ERR_DENIED) | |
2847 | status = -EAGAIN; | |
2848 | nfs4_put_lock_state(lsp); | |
2849 | return status; | |
2850 | } | |
2851 | ||
2852 | static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request) | |
2853 | { | |
202b50dc TM |
2854 | struct nfs_server *server = NFS_SERVER(state->inode); |
2855 | struct nfs4_exception exception = { }; | |
2856 | int err; | |
2857 | ||
2858 | do { | |
2859 | err = _nfs4_do_setlk(state, F_SETLK, request, 1); | |
2860 | if (err != -NFS4ERR_DELAY) | |
2861 | break; | |
2862 | nfs4_handle_exception(server, err, &exception); | |
2863 | } while (exception.retry); | |
2864 | return err; | |
1da177e4 LT |
2865 | } |
2866 | ||
2867 | static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request) | |
2868 | { | |
202b50dc TM |
2869 | struct nfs_server *server = NFS_SERVER(state->inode); |
2870 | struct nfs4_exception exception = { }; | |
2871 | int err; | |
2872 | ||
2873 | do { | |
2874 | err = _nfs4_do_setlk(state, F_SETLK, request, 0); | |
2875 | if (err != -NFS4ERR_DELAY) | |
2876 | break; | |
2877 | nfs4_handle_exception(server, err, &exception); | |
2878 | } while (exception.retry); | |
2879 | return err; | |
1da177e4 LT |
2880 | } |
2881 | ||
2882 | static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) | |
2883 | { | |
2884 | struct nfs4_client *clp = state->owner->so_client; | |
2885 | int status; | |
2886 | ||
2887 | down_read(&clp->cl_sem); | |
2888 | down(&state->lock_sema); | |
2889 | status = _nfs4_do_setlk(state, cmd, request, 0); | |
2890 | up(&state->lock_sema); | |
2891 | if (status == 0) { | |
2892 | /* Note: we always want to sleep here! */ | |
2893 | request->fl_flags |= FL_SLEEP; | |
2894 | if (do_vfs_lock(request->fl_file, request) < 0) | |
2895 | printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", __FUNCTION__); | |
2896 | } | |
2897 | up_read(&clp->cl_sem); | |
2898 | return status; | |
2899 | } | |
2900 | ||
2901 | static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request) | |
2902 | { | |
2903 | struct nfs4_exception exception = { }; | |
2904 | int err; | |
2905 | ||
2906 | do { | |
2907 | err = nfs4_handle_exception(NFS_SERVER(state->inode), | |
2908 | _nfs4_proc_setlk(state, cmd, request), | |
2909 | &exception); | |
2910 | } while (exception.retry); | |
2911 | return err; | |
2912 | } | |
2913 | ||
2914 | static int | |
2915 | nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request) | |
2916 | { | |
2917 | struct nfs_open_context *ctx; | |
2918 | struct nfs4_state *state; | |
2919 | unsigned long timeout = NFS4_LOCK_MINTIMEOUT; | |
2920 | int status; | |
2921 | ||
2922 | /* verify open state */ | |
2923 | ctx = (struct nfs_open_context *)filp->private_data; | |
2924 | state = ctx->state; | |
2925 | ||
2926 | if (request->fl_start < 0 || request->fl_end < 0) | |
2927 | return -EINVAL; | |
2928 | ||
2929 | if (IS_GETLK(cmd)) | |
2930 | return nfs4_proc_getlk(state, F_GETLK, request); | |
2931 | ||
2932 | if (!(IS_SETLK(cmd) || IS_SETLKW(cmd))) | |
2933 | return -EINVAL; | |
2934 | ||
2935 | if (request->fl_type == F_UNLCK) | |
2936 | return nfs4_proc_unlck(state, cmd, request); | |
2937 | ||
2938 | do { | |
2939 | status = nfs4_proc_setlk(state, cmd, request); | |
2940 | if ((status != -EAGAIN) || IS_SETLK(cmd)) | |
2941 | break; | |
2942 | timeout = nfs4_set_lock_task_retry(timeout); | |
2943 | status = -ERESTARTSYS; | |
2944 | if (signalled()) | |
2945 | break; | |
2946 | } while(status < 0); | |
2947 | ||
2948 | return status; | |
2949 | } | |
2950 | ||
6b3b5496 | 2951 | |
aa1870af BF |
2952 | #define XATTR_NAME_NFSV4_ACL "system.nfs4_acl" |
2953 | ||
6b3b5496 BF |
2954 | int nfs4_setxattr(struct dentry *dentry, const char *key, const void *buf, |
2955 | size_t buflen, int flags) | |
2956 | { | |
4b580ee3 BF |
2957 | struct inode *inode = dentry->d_inode; |
2958 | ||
2959 | if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) | |
2960 | return -EOPNOTSUPP; | |
2961 | ||
2962 | if (!S_ISREG(inode->i_mode) && | |
2963 | (!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX)) | |
2964 | return -EPERM; | |
2965 | ||
2966 | return nfs4_proc_set_acl(inode, buf, buflen); | |
6b3b5496 BF |
2967 | } |
2968 | ||
2969 | /* The getxattr man page suggests returning -ENODATA for unknown attributes, | |
2970 | * and that's what we'll do for e.g. user attributes that haven't been set. | |
2971 | * But we'll follow ext2/ext3's lead by returning -EOPNOTSUPP for unsupported | |
2972 | * attributes in kernel-managed attribute namespaces. */ | |
2973 | ssize_t nfs4_getxattr(struct dentry *dentry, const char *key, void *buf, | |
2974 | size_t buflen) | |
2975 | { | |
aa1870af BF |
2976 | struct inode *inode = dentry->d_inode; |
2977 | ||
2978 | if (strcmp(key, XATTR_NAME_NFSV4_ACL) != 0) | |
2979 | return -EOPNOTSUPP; | |
2980 | ||
2981 | return nfs4_proc_get_acl(inode, buf, buflen); | |
6b3b5496 BF |
2982 | } |
2983 | ||
2984 | ssize_t nfs4_listxattr(struct dentry *dentry, char *buf, size_t buflen) | |
2985 | { | |
aa1870af | 2986 | size_t len = strlen(XATTR_NAME_NFSV4_ACL) + 1; |
6b3b5496 BF |
2987 | |
2988 | if (buf && buflen < len) | |
2989 | return -ERANGE; | |
2990 | if (buf) | |
aa1870af BF |
2991 | memcpy(buf, XATTR_NAME_NFSV4_ACL, len); |
2992 | return len; | |
6b3b5496 BF |
2993 | } |
2994 | ||
1da177e4 LT |
2995 | struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = { |
2996 | .recover_open = nfs4_open_reclaim, | |
2997 | .recover_lock = nfs4_lock_reclaim, | |
2998 | }; | |
2999 | ||
3000 | struct nfs4_state_recovery_ops nfs4_network_partition_recovery_ops = { | |
3001 | .recover_open = nfs4_open_expired, | |
3002 | .recover_lock = nfs4_lock_expired, | |
3003 | }; | |
3004 | ||
6b3b5496 BF |
3005 | static struct inode_operations nfs4_file_inode_operations = { |
3006 | .permission = nfs_permission, | |
3007 | .getattr = nfs_getattr, | |
3008 | .setattr = nfs_setattr, | |
3009 | .getxattr = nfs4_getxattr, | |
3010 | .setxattr = nfs4_setxattr, | |
3011 | .listxattr = nfs4_listxattr, | |
3012 | }; | |
3013 | ||
1da177e4 LT |
3014 | struct nfs_rpc_ops nfs_v4_clientops = { |
3015 | .version = 4, /* protocol version */ | |
3016 | .dentry_ops = &nfs4_dentry_operations, | |
3017 | .dir_inode_ops = &nfs4_dir_inode_operations, | |
6b3b5496 | 3018 | .file_inode_ops = &nfs4_file_inode_operations, |
1da177e4 LT |
3019 | .getroot = nfs4_proc_get_root, |
3020 | .getattr = nfs4_proc_getattr, | |
3021 | .setattr = nfs4_proc_setattr, | |
3022 | .lookup = nfs4_proc_lookup, | |
3023 | .access = nfs4_proc_access, | |
3024 | .readlink = nfs4_proc_readlink, | |
3025 | .read = nfs4_proc_read, | |
3026 | .write = nfs4_proc_write, | |
3027 | .commit = nfs4_proc_commit, | |
3028 | .create = nfs4_proc_create, | |
3029 | .remove = nfs4_proc_remove, | |
3030 | .unlink_setup = nfs4_proc_unlink_setup, | |
3031 | .unlink_done = nfs4_proc_unlink_done, | |
3032 | .rename = nfs4_proc_rename, | |
3033 | .link = nfs4_proc_link, | |
3034 | .symlink = nfs4_proc_symlink, | |
3035 | .mkdir = nfs4_proc_mkdir, | |
3036 | .rmdir = nfs4_proc_remove, | |
3037 | .readdir = nfs4_proc_readdir, | |
3038 | .mknod = nfs4_proc_mknod, | |
3039 | .statfs = nfs4_proc_statfs, | |
3040 | .fsinfo = nfs4_proc_fsinfo, | |
3041 | .pathconf = nfs4_proc_pathconf, | |
3042 | .decode_dirent = nfs4_decode_dirent, | |
3043 | .read_setup = nfs4_proc_read_setup, | |
3044 | .write_setup = nfs4_proc_write_setup, | |
3045 | .commit_setup = nfs4_proc_commit_setup, | |
3046 | .file_open = nfs4_proc_file_open, | |
3047 | .file_release = nfs4_proc_file_release, | |
3048 | .lock = nfs4_proc_lock, | |
e50a1c2e | 3049 | .clear_acl_cache = nfs4_zap_acl_attr, |
1da177e4 LT |
3050 | }; |
3051 | ||
3052 | /* | |
3053 | * Local variables: | |
3054 | * c-basic-offset: 8 | |
3055 | * End: | |
3056 | */ |