Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * File operations used by nfsd. Some of these have been ripped from |
3 | * other parts of the kernel because they weren't exported, others | |
4 | * are partial duplicates with added or changed functionality. | |
5 | * | |
6 | * Note that several functions dget() the dentry upon which they want | |
7 | * to act, most notably those that create directory entries. Response | |
8 | * dentry's are dput()'d if necessary in the release callback. | |
9 | * So if you notice code paths that apparently fail to dput() the | |
10 | * dentry, don't worry--they have been taken care of. | |
11 | * | |
12 | * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> | |
13 | * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> | |
14 | */ | |
15 | ||
1da177e4 LT |
16 | #include <linux/fs.h> |
17 | #include <linux/file.h> | |
d6b29d7c | 18 | #include <linux/splice.h> |
1da177e4 | 19 | #include <linux/fcntl.h> |
1da177e4 | 20 | #include <linux/namei.h> |
1da177e4 | 21 | #include <linux/delay.h> |
0eeca283 | 22 | #include <linux/fsnotify.h> |
1da177e4 | 23 | #include <linux/posix_acl_xattr.h> |
1da177e4 | 24 | #include <linux/xattr.h> |
9a74af21 BH |
25 | #include <linux/jhash.h> |
26 | #include <linux/ima.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
9a74af21 | 28 | #include <asm/uaccess.h> |
f501912a BM |
29 | #include <linux/exportfs.h> |
30 | #include <linux/writeback.h> | |
9a74af21 BH |
31 | |
32 | #ifdef CONFIG_NFSD_V3 | |
33 | #include "xdr3.h" | |
34 | #endif /* CONFIG_NFSD_V3 */ | |
35 | ||
5be196e5 | 36 | #ifdef CONFIG_NFSD_V4 |
2ca72e17 BF |
37 | #include "acl.h" |
38 | #include "idmap.h" | |
1da177e4 LT |
39 | #endif /* CONFIG_NFSD_V4 */ |
40 | ||
9a74af21 BH |
41 | #include "nfsd.h" |
42 | #include "vfs.h" | |
1da177e4 LT |
43 | |
44 | #define NFSDDBG_FACILITY NFSDDBG_FILEOP | |
1da177e4 LT |
45 | |
46 | ||
1da177e4 LT |
47 | /* |
48 | * This is a cache of readahead params that help us choose the proper | |
49 | * readahead strategy. Initially, we set all readahead parameters to 0 | |
50 | * and let the VFS handle things. | |
51 | * If you increase the number of cached files very much, you'll need to | |
52 | * add a hash table here. | |
53 | */ | |
54 | struct raparms { | |
55 | struct raparms *p_next; | |
56 | unsigned int p_count; | |
57 | ino_t p_ino; | |
58 | dev_t p_dev; | |
59 | int p_set; | |
60 | struct file_ra_state p_ra; | |
fce1456a | 61 | unsigned int p_hindex; |
1da177e4 LT |
62 | }; |
63 | ||
fce1456a GB |
64 | struct raparm_hbucket { |
65 | struct raparms *pb_head; | |
66 | spinlock_t pb_lock; | |
67 | } ____cacheline_aligned_in_smp; | |
68 | ||
fce1456a GB |
69 | #define RAPARM_HASH_BITS 4 |
70 | #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) | |
71 | #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) | |
72 | static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; | |
1da177e4 LT |
73 | |
74 | /* | |
75 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed | |
76 | * a mount point. | |
e0bb89ef | 77 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
1da177e4 LT |
78 | * or nfs_ok having possibly changed *dpp and *expp |
79 | */ | |
80 | int | |
81 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, | |
82 | struct svc_export **expp) | |
83 | { | |
84 | struct svc_export *exp = *expp, *exp2 = NULL; | |
85 | struct dentry *dentry = *dpp; | |
91c9fa8f AV |
86 | struct path path = {.mnt = mntget(exp->ex_path.mnt), |
87 | .dentry = dget(dentry)}; | |
6264d69d | 88 | int err = 0; |
1da177e4 | 89 | |
7cc90cc3 | 90 | err = follow_down(&path); |
cc53ce53 DH |
91 | if (err < 0) |
92 | goto out; | |
1da177e4 | 93 | |
91c9fa8f | 94 | exp2 = rqst_exp_get_by_name(rqstp, &path); |
1da177e4 | 95 | if (IS_ERR(exp2)) { |
3b6cee7b BF |
96 | err = PTR_ERR(exp2); |
97 | /* | |
98 | * We normally allow NFS clients to continue | |
99 | * "underneath" a mountpoint that is not exported. | |
100 | * The exception is V4ROOT, where no traversal is ever | |
101 | * allowed without an explicit export of the new | |
102 | * directory. | |
103 | */ | |
104 | if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) | |
105 | err = 0; | |
91c9fa8f | 106 | path_put(&path); |
1da177e4 LT |
107 | goto out; |
108 | } | |
3c394dda SD |
109 | if (nfsd_v4client(rqstp) || |
110 | (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { | |
1da177e4 | 111 | /* successfully crossed mount point */ |
1644ccc8 | 112 | /* |
91c9fa8f AV |
113 | * This is subtle: path.dentry is *not* on path.mnt |
114 | * at this point. The only reason we are safe is that | |
115 | * original mnt is pinned down by exp, so we should | |
116 | * put path *before* putting exp | |
1644ccc8 | 117 | */ |
91c9fa8f AV |
118 | *dpp = path.dentry; |
119 | path.dentry = dentry; | |
1644ccc8 | 120 | *expp = exp2; |
91c9fa8f | 121 | exp2 = exp; |
1da177e4 | 122 | } |
91c9fa8f AV |
123 | path_put(&path); |
124 | exp_put(exp2); | |
1da177e4 LT |
125 | out: |
126 | return err; | |
127 | } | |
128 | ||
289ede45 BF |
129 | static void follow_to_parent(struct path *path) |
130 | { | |
131 | struct dentry *dp; | |
132 | ||
133 | while (path->dentry == path->mnt->mnt_root && follow_up(path)) | |
134 | ; | |
135 | dp = dget_parent(path->dentry); | |
136 | dput(path->dentry); | |
137 | path->dentry = dp; | |
138 | } | |
139 | ||
140 | static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) | |
141 | { | |
142 | struct svc_export *exp2; | |
143 | struct path path = {.mnt = mntget((*exp)->ex_path.mnt), | |
144 | .dentry = dget(dparent)}; | |
145 | ||
146 | follow_to_parent(&path); | |
147 | ||
148 | exp2 = rqst_exp_parent(rqstp, &path); | |
149 | if (PTR_ERR(exp2) == -ENOENT) { | |
150 | *dentryp = dget(dparent); | |
151 | } else if (IS_ERR(exp2)) { | |
152 | path_put(&path); | |
153 | return PTR_ERR(exp2); | |
154 | } else { | |
155 | *dentryp = dget(path.dentry); | |
156 | exp_put(*exp); | |
157 | *exp = exp2; | |
158 | } | |
159 | path_put(&path); | |
160 | return 0; | |
161 | } | |
162 | ||
82ead7fe BF |
163 | /* |
164 | * For nfsd purposes, we treat V4ROOT exports as though there was an | |
165 | * export at *every* directory. | |
166 | */ | |
3227fa41 | 167 | int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) |
82ead7fe BF |
168 | { |
169 | if (d_mountpoint(dentry)) | |
170 | return 1; | |
11fcee02 TM |
171 | if (nfsd4_is_junction(dentry)) |
172 | return 1; | |
82ead7fe BF |
173 | if (!(exp->ex_flags & NFSEXP_V4ROOT)) |
174 | return 0; | |
175 | return dentry->d_inode != NULL; | |
176 | } | |
177 | ||
6264d69d | 178 | __be32 |
6c0a654d | 179 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
5a022fc8 | 180 | const char *name, unsigned int len, |
6c0a654d | 181 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
1da177e4 LT |
182 | { |
183 | struct svc_export *exp; | |
184 | struct dentry *dparent; | |
185 | struct dentry *dentry; | |
6264d69d | 186 | int host_err; |
1da177e4 LT |
187 | |
188 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); | |
189 | ||
1da177e4 LT |
190 | dparent = fhp->fh_dentry; |
191 | exp = fhp->fh_export; | |
192 | exp_get(exp); | |
193 | ||
1da177e4 LT |
194 | /* Lookup the name, but don't follow links */ |
195 | if (isdotent(name, len)) { | |
196 | if (len==1) | |
197 | dentry = dget(dparent); | |
54775491 | 198 | else if (dparent != exp->ex_path.dentry) |
1da177e4 | 199 | dentry = dget_parent(dparent); |
fed83811 | 200 | else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) |
1da177e4 LT |
201 | dentry = dget(dparent); /* .. == . just like at / */ |
202 | else { | |
203 | /* checking mountpoint crossing is very different when stepping up */ | |
289ede45 BF |
204 | host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); |
205 | if (host_err) | |
1da177e4 | 206 | goto out_nfserr; |
1da177e4 LT |
207 | } |
208 | } else { | |
209 | fh_lock(fhp); | |
210 | dentry = lookup_one_len(name, dparent, len); | |
6264d69d | 211 | host_err = PTR_ERR(dentry); |
1da177e4 LT |
212 | if (IS_ERR(dentry)) |
213 | goto out_nfserr; | |
214 | /* | |
215 | * check if we have crossed a mount point ... | |
216 | */ | |
82ead7fe | 217 | if (nfsd_mountpoint(dentry, exp)) { |
6264d69d | 218 | if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
1da177e4 LT |
219 | dput(dentry); |
220 | goto out_nfserr; | |
221 | } | |
222 | } | |
223 | } | |
6c0a654d BF |
224 | *dentry_ret = dentry; |
225 | *exp_ret = exp; | |
226 | return 0; | |
227 | ||
228 | out_nfserr: | |
229 | exp_put(exp); | |
230 | return nfserrno(host_err); | |
231 | } | |
232 | ||
233 | /* | |
234 | * Look up one component of a pathname. | |
235 | * N.B. After this call _both_ fhp and resfh need an fh_put | |
236 | * | |
237 | * If the lookup would cross a mountpoint, and the mounted filesystem | |
238 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is | |
239 | * accepted as it stands and the mounted directory is | |
240 | * returned. Otherwise the covered directory is returned. | |
241 | * NOTE: this mountpoint crossing is not supported properly by all | |
242 | * clients and is explicitly disallowed for NFSv3 | |
243 | * NeilBrown <neilb@cse.unsw.edu.au> | |
244 | */ | |
245 | __be32 | |
246 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, | |
5a022fc8 | 247 | unsigned int len, struct svc_fh *resfh) |
6c0a654d BF |
248 | { |
249 | struct svc_export *exp; | |
250 | struct dentry *dentry; | |
251 | __be32 err; | |
252 | ||
29a78a3e BF |
253 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
254 | if (err) | |
255 | return err; | |
6c0a654d BF |
256 | err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); |
257 | if (err) | |
258 | return err; | |
32c1eb0c AA |
259 | err = check_nfsd_access(exp, rqstp); |
260 | if (err) | |
261 | goto out; | |
1da177e4 LT |
262 | /* |
263 | * Note: we compose the file handle now, but as the | |
264 | * dentry may be negative, it may need to be updated. | |
265 | */ | |
266 | err = fh_compose(resfh, exp, dentry, fhp); | |
267 | if (!err && !dentry->d_inode) | |
268 | err = nfserr_noent; | |
32c1eb0c | 269 | out: |
1da177e4 | 270 | dput(dentry); |
1da177e4 LT |
271 | exp_put(exp); |
272 | return err; | |
1da177e4 LT |
273 | } |
274 | ||
4795bb37 BF |
275 | static int nfsd_break_lease(struct inode *inode) |
276 | { | |
277 | if (!S_ISREG(inode->i_mode)) | |
278 | return 0; | |
279 | return break_lease(inode, O_WRONLY | O_NONBLOCK); | |
280 | } | |
281 | ||
f501912a BM |
282 | /* |
283 | * Commit metadata changes to stable storage. | |
284 | */ | |
285 | static int | |
286 | commit_metadata(struct svc_fh *fhp) | |
287 | { | |
288 | struct inode *inode = fhp->fh_dentry->d_inode; | |
289 | const struct export_operations *export_ops = inode->i_sb->s_export_op; | |
f501912a BM |
290 | |
291 | if (!EX_ISSYNC(fhp->fh_export)) | |
292 | return 0; | |
293 | ||
c3765016 CH |
294 | if (export_ops->commit_metadata) |
295 | return export_ops->commit_metadata(inode); | |
296 | return sync_inode_metadata(inode, 1); | |
f501912a | 297 | } |
6c0a654d | 298 | |
1da177e4 | 299 | /* |
b26be14b CH |
300 | * Go over the attributes and take care of the small differences between |
301 | * NFS semantics and what Linux expects. | |
1da177e4 | 302 | */ |
b26be14b CH |
303 | static void |
304 | nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) | |
1da177e4 | 305 | { |
9c85fca5 CH |
306 | /* |
307 | * NFSv2 does not differentiate between "set-[ac]time-to-now" | |
1da177e4 LT |
308 | * which only requires access, and "set-[ac]time-to-X" which |
309 | * requires ownership. | |
310 | * So if it looks like it might be "set both to the same time which | |
311 | * is close to now", and if inode_change_ok fails, then we | |
312 | * convert to "set to now" instead of "set to explicit time" | |
313 | * | |
314 | * We only call inode_change_ok as the last test as technically | |
b26be14b | 315 | * it is not an interface that we should be using. |
1da177e4 LT |
316 | */ |
317 | #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) | |
318 | #define MAX_TOUCH_TIME_ERROR (30*60) | |
9c85fca5 CH |
319 | if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && |
320 | iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { | |
321 | /* | |
322 | * Looks probable. | |
323 | * | |
324 | * Now just make sure time is in the right ballpark. | |
325 | * Solaris, at least, doesn't seem to care what the time | |
326 | * request is. We require it be within 30 minutes of now. | |
1da177e4 | 327 | */ |
9c85fca5 CH |
328 | time_t delta = iap->ia_atime.tv_sec - get_seconds(); |
329 | if (delta < 0) | |
330 | delta = -delta; | |
331 | if (delta < MAX_TOUCH_TIME_ERROR && | |
332 | inode_change_ok(inode, iap) != 0) { | |
333 | /* | |
334 | * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. | |
335 | * This will cause notify_change to set these times | |
336 | * to "now" | |
337 | */ | |
338 | iap->ia_valid &= ~BOTH_TIME_SET; | |
339 | } | |
1da177e4 | 340 | } |
1da177e4 | 341 | |
ca456252 | 342 | /* sanitize the mode change */ |
1da177e4 LT |
343 | if (iap->ia_valid & ATTR_MODE) { |
344 | iap->ia_mode &= S_IALLUGO; | |
dee3209d | 345 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
ca456252 JL |
346 | } |
347 | ||
348 | /* Revoke setuid/setgid on chown */ | |
0953e620 | 349 | if (!S_ISDIR(inode->i_mode) && |
6fab8779 EB |
350 | (((iap->ia_valid & ATTR_UID) && !uid_eq(iap->ia_uid, inode->i_uid)) || |
351 | ((iap->ia_valid & ATTR_GID) && !gid_eq(iap->ia_gid, inode->i_gid)))) { | |
ca456252 JL |
352 | iap->ia_valid |= ATTR_KILL_PRIV; |
353 | if (iap->ia_valid & ATTR_MODE) { | |
354 | /* we're setting mode too, just clear the s*id bits */ | |
8a0ce7d9 | 355 | iap->ia_mode &= ~S_ISUID; |
ca456252 JL |
356 | if (iap->ia_mode & S_IXGRP) |
357 | iap->ia_mode &= ~S_ISGID; | |
358 | } else { | |
359 | /* set ATTR_KILL_* bits and let VFS handle it */ | |
360 | iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); | |
8a0ce7d9 | 361 | } |
1da177e4 | 362 | } |
b26be14b CH |
363 | } |
364 | ||
365 | static __be32 | |
366 | nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
367 | struct iattr *iap) | |
368 | { | |
369 | struct inode *inode = fhp->fh_dentry->d_inode; | |
370 | int host_err; | |
371 | ||
372 | if (iap->ia_size < inode->i_size) { | |
373 | __be32 err; | |
374 | ||
375 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, | |
376 | NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); | |
377 | if (err) | |
378 | return err; | |
379 | } | |
380 | ||
381 | host_err = get_write_access(inode); | |
382 | if (host_err) | |
383 | goto out_nfserrno; | |
384 | ||
385 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); | |
386 | if (host_err) | |
387 | goto out_put_write_access; | |
388 | return 0; | |
389 | ||
390 | out_put_write_access: | |
391 | put_write_access(inode); | |
392 | out_nfserrno: | |
393 | return nfserrno(host_err); | |
394 | } | |
395 | ||
396 | /* | |
397 | * Set various file attributes. After this call fhp needs an fh_put. | |
398 | */ | |
399 | __be32 | |
400 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, | |
401 | int check_guard, time_t guardtime) | |
402 | { | |
403 | struct dentry *dentry; | |
404 | struct inode *inode; | |
405 | int accmode = NFSD_MAY_SATTR; | |
406 | umode_t ftype = 0; | |
407 | __be32 err; | |
408 | int host_err; | |
b57d9c3f | 409 | bool get_write_count; |
b26be14b CH |
410 | int size_change = 0; |
411 | ||
412 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) | |
413 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; | |
414 | if (iap->ia_valid & ATTR_SIZE) | |
415 | ftype = S_IFREG; | |
416 | ||
b57d9c3f BF |
417 | /* Callers that do fh_verify should do the fh_want_write: */ |
418 | get_write_count = !fhp->fh_dentry; | |
419 | ||
b26be14b CH |
420 | /* Get inode */ |
421 | err = fh_verify(rqstp, fhp, ftype, accmode); | |
422 | if (err) | |
423 | goto out; | |
b57d9c3f BF |
424 | if (get_write_count) { |
425 | host_err = fh_want_write(fhp); | |
426 | if (host_err) | |
427 | return nfserrno(host_err); | |
428 | } | |
b26be14b CH |
429 | |
430 | dentry = fhp->fh_dentry; | |
431 | inode = dentry->d_inode; | |
432 | ||
433 | /* Ignore any mode updates on symlinks */ | |
434 | if (S_ISLNK(inode->i_mode)) | |
435 | iap->ia_valid &= ~ATTR_MODE; | |
436 | ||
437 | if (!iap->ia_valid) | |
438 | goto out; | |
1da177e4 | 439 | |
b26be14b CH |
440 | nfsd_sanitize_attrs(inode, iap); |
441 | ||
442 | /* | |
443 | * The size case is special, it changes the file in addition to the | |
444 | * attributes. | |
445 | */ | |
446 | if (iap->ia_valid & ATTR_SIZE) { | |
447 | err = nfsd_get_write_access(rqstp, fhp, iap); | |
448 | if (err) | |
449 | goto out; | |
450 | size_change = 1; | |
451 | } | |
1da177e4 LT |
452 | |
453 | iap->ia_valid |= ATTR_CTIME; | |
454 | ||
e7c1ad19 CH |
455 | if (check_guard && guardtime != inode->i_ctime.tv_sec) { |
456 | err = nfserr_notsync; | |
457 | goto out_put_write_access; | |
1da177e4 | 458 | } |
e7c1ad19 CH |
459 | |
460 | host_err = nfsd_break_lease(inode); | |
461 | if (host_err) | |
462 | goto out_put_write_access_nfserror; | |
463 | ||
464 | fh_lock(fhp); | |
465 | host_err = notify_change(dentry, iap); | |
466 | fh_unlock(fhp); | |
467 | ||
468 | out_put_write_access_nfserror: | |
469 | err = nfserrno(host_err); | |
470 | out_put_write_access: | |
1da177e4 LT |
471 | if (size_change) |
472 | put_write_access(inode); | |
473 | if (!err) | |
b160fdab | 474 | commit_metadata(fhp); |
1da177e4 LT |
475 | out: |
476 | return err; | |
1da177e4 LT |
477 | } |
478 | ||
5be196e5 CH |
479 | #if defined(CONFIG_NFSD_V2_ACL) || \ |
480 | defined(CONFIG_NFSD_V3_ACL) || \ | |
481 | defined(CONFIG_NFSD_V4) | |
482 | static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) | |
483 | { | |
484 | ssize_t buflen; | |
6c6a426f | 485 | ssize_t ret; |
5be196e5 CH |
486 | |
487 | buflen = vfs_getxattr(dentry, key, NULL, 0); | |
488 | if (buflen <= 0) | |
489 | return buflen; | |
1da177e4 | 490 | |
5be196e5 CH |
491 | *buf = kmalloc(buflen, GFP_KERNEL); |
492 | if (!*buf) | |
493 | return -ENOMEM; | |
494 | ||
6c6a426f KK |
495 | ret = vfs_getxattr(dentry, key, *buf, buflen); |
496 | if (ret < 0) | |
497 | kfree(*buf); | |
498 | return ret; | |
5be196e5 CH |
499 | } |
500 | #endif | |
501 | ||
502 | #if defined(CONFIG_NFSD_V4) | |
1da177e4 LT |
503 | static int |
504 | set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) | |
505 | { | |
506 | int len; | |
507 | size_t buflen; | |
508 | char *buf = NULL; | |
509 | int error = 0; | |
1da177e4 | 510 | |
617e78c9 SG |
511 | if (!pacl) |
512 | return vfs_setxattr(dentry, key, NULL, 0, 0); | |
513 | ||
1da177e4 LT |
514 | buflen = posix_acl_xattr_size(pacl->a_count); |
515 | buf = kmalloc(buflen, GFP_KERNEL); | |
516 | error = -ENOMEM; | |
517 | if (buf == NULL) | |
518 | goto out; | |
519 | ||
5f3a4a28 | 520 | len = posix_acl_to_xattr(&init_user_ns, pacl, buf, buflen); |
1da177e4 LT |
521 | if (len < 0) { |
522 | error = len; | |
523 | goto out; | |
524 | } | |
525 | ||
5be196e5 | 526 | error = vfs_setxattr(dentry, key, buf, len, 0); |
1da177e4 LT |
527 | out: |
528 | kfree(buf); | |
529 | return error; | |
530 | } | |
531 | ||
6264d69d | 532 | __be32 |
1da177e4 LT |
533 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
534 | struct nfs4_acl *acl) | |
535 | { | |
6264d69d AV |
536 | __be32 error; |
537 | int host_error; | |
1da177e4 LT |
538 | struct dentry *dentry; |
539 | struct inode *inode; | |
540 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
541 | unsigned int flags = 0; | |
542 | ||
543 | /* Get inode */ | |
e281d810 | 544 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR); |
1da177e4 | 545 | if (error) |
4b2ca38a | 546 | return error; |
1da177e4 LT |
547 | |
548 | dentry = fhp->fh_dentry; | |
549 | inode = dentry->d_inode; | |
550 | if (S_ISDIR(inode->i_mode)) | |
551 | flags = NFS4_ACL_DIR; | |
552 | ||
6264d69d AV |
553 | host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
554 | if (host_error == -EINVAL) { | |
4b2ca38a | 555 | return nfserr_attrnotsupp; |
6264d69d | 556 | } else if (host_error < 0) |
1da177e4 LT |
557 | goto out_nfserr; |
558 | ||
6264d69d AV |
559 | host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); |
560 | if (host_error < 0) | |
4b2ca38a | 561 | goto out_release; |
1da177e4 | 562 | |
4b2ca38a | 563 | if (S_ISDIR(inode->i_mode)) |
6264d69d | 564 | host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); |
1da177e4 | 565 | |
4b2ca38a | 566 | out_release: |
1da177e4 LT |
567 | posix_acl_release(pacl); |
568 | posix_acl_release(dpacl); | |
1da177e4 | 569 | out_nfserr: |
f34f9242 | 570 | if (host_error == -EOPNOTSUPP) |
4b2ca38a | 571 | return nfserr_attrnotsupp; |
f34f9242 | 572 | else |
4b2ca38a | 573 | return nfserrno(host_error); |
1da177e4 LT |
574 | } |
575 | ||
576 | static struct posix_acl * | |
577 | _get_posix_acl(struct dentry *dentry, char *key) | |
578 | { | |
5be196e5 | 579 | void *buf = NULL; |
1da177e4 | 580 | struct posix_acl *pacl = NULL; |
5be196e5 | 581 | int buflen; |
1da177e4 | 582 | |
5be196e5 CH |
583 | buflen = nfsd_getxattr(dentry, key, &buf); |
584 | if (!buflen) | |
585 | buflen = -ENODATA; | |
586 | if (buflen <= 0) | |
587 | return ERR_PTR(buflen); | |
1da177e4 | 588 | |
5f3a4a28 | 589 | pacl = posix_acl_from_xattr(&init_user_ns, buf, buflen); |
1da177e4 LT |
590 | kfree(buf); |
591 | return pacl; | |
1da177e4 LT |
592 | } |
593 | ||
594 | int | |
595 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) | |
596 | { | |
597 | struct inode *inode = dentry->d_inode; | |
598 | int error = 0; | |
599 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
600 | unsigned int flags = 0; | |
601 | ||
9a59f452 | 602 | pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); |
1da177e4 LT |
603 | if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) |
604 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); | |
605 | if (IS_ERR(pacl)) { | |
606 | error = PTR_ERR(pacl); | |
607 | pacl = NULL; | |
608 | goto out; | |
609 | } | |
610 | ||
611 | if (S_ISDIR(inode->i_mode)) { | |
9a59f452 | 612 | dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); |
1da177e4 LT |
613 | if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) |
614 | dpacl = NULL; | |
615 | else if (IS_ERR(dpacl)) { | |
616 | error = PTR_ERR(dpacl); | |
617 | dpacl = NULL; | |
618 | goto out; | |
619 | } | |
620 | flags = NFS4_ACL_DIR; | |
621 | } | |
622 | ||
623 | *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); | |
624 | if (IS_ERR(*acl)) { | |
625 | error = PTR_ERR(*acl); | |
626 | *acl = NULL; | |
627 | } | |
628 | out: | |
629 | posix_acl_release(pacl); | |
630 | posix_acl_release(dpacl); | |
631 | return error; | |
632 | } | |
633 | ||
9b4146e8 CL |
634 | /* |
635 | * NFS junction information is stored in an extended attribute. | |
636 | */ | |
637 | #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" | |
638 | ||
639 | /** | |
640 | * nfsd4_is_junction - Test if an object could be an NFS junction | |
641 | * | |
642 | * @dentry: object to test | |
643 | * | |
644 | * Returns 1 if "dentry" appears to contain NFS junction information. | |
645 | * Otherwise 0 is returned. | |
646 | */ | |
11fcee02 TM |
647 | int nfsd4_is_junction(struct dentry *dentry) |
648 | { | |
649 | struct inode *inode = dentry->d_inode; | |
650 | ||
651 | if (inode == NULL) | |
652 | return 0; | |
653 | if (inode->i_mode & S_IXUGO) | |
654 | return 0; | |
655 | if (!(inode->i_mode & S_ISVTX)) | |
656 | return 0; | |
9b4146e8 | 657 | if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) |
11fcee02 TM |
658 | return 0; |
659 | return 1; | |
660 | } | |
6a85d6c7 | 661 | #endif /* defined(CONFIG_NFSD_V4) */ |
1da177e4 LT |
662 | |
663 | #ifdef CONFIG_NFSD_V3 | |
664 | /* | |
665 | * Check server access rights to a file system object | |
666 | */ | |
667 | struct accessmap { | |
668 | u32 access; | |
669 | int how; | |
670 | }; | |
671 | static struct accessmap nfs3_regaccess[] = { | |
8837abca MS |
672 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
673 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
674 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, | |
675 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, | |
1da177e4 LT |
676 | |
677 | { 0, 0 } | |
678 | }; | |
679 | ||
680 | static struct accessmap nfs3_diraccess[] = { | |
8837abca MS |
681 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
682 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, | |
683 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, | |
684 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, | |
685 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, | |
1da177e4 LT |
686 | |
687 | { 0, 0 } | |
688 | }; | |
689 | ||
690 | static struct accessmap nfs3_anyaccess[] = { | |
691 | /* Some clients - Solaris 2.6 at least, make an access call | |
692 | * to the server to check for access for things like /dev/null | |
693 | * (which really, the server doesn't care about). So | |
694 | * We provide simple access checking for them, looking | |
695 | * mainly at mode bits, and we make sure to ignore read-only | |
696 | * filesystem checks | |
697 | */ | |
8837abca MS |
698 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
699 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
700 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
701 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
1da177e4 LT |
702 | |
703 | { 0, 0 } | |
704 | }; | |
705 | ||
6264d69d | 706 | __be32 |
1da177e4 LT |
707 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
708 | { | |
709 | struct accessmap *map; | |
710 | struct svc_export *export; | |
711 | struct dentry *dentry; | |
712 | u32 query, result = 0, sresult = 0; | |
6264d69d | 713 | __be32 error; |
1da177e4 | 714 | |
8837abca | 715 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
716 | if (error) |
717 | goto out; | |
718 | ||
719 | export = fhp->fh_export; | |
720 | dentry = fhp->fh_dentry; | |
721 | ||
722 | if (S_ISREG(dentry->d_inode->i_mode)) | |
723 | map = nfs3_regaccess; | |
724 | else if (S_ISDIR(dentry->d_inode->i_mode)) | |
725 | map = nfs3_diraccess; | |
726 | else | |
727 | map = nfs3_anyaccess; | |
728 | ||
729 | ||
730 | query = *access; | |
731 | for (; map->access; map++) { | |
732 | if (map->access & query) { | |
6264d69d | 733 | __be32 err2; |
1da177e4 LT |
734 | |
735 | sresult |= map->access; | |
736 | ||
0ec757df | 737 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
1da177e4 LT |
738 | switch (err2) { |
739 | case nfs_ok: | |
740 | result |= map->access; | |
741 | break; | |
742 | ||
743 | /* the following error codes just mean the access was not allowed, | |
744 | * rather than an error occurred */ | |
745 | case nfserr_rofs: | |
746 | case nfserr_acces: | |
747 | case nfserr_perm: | |
748 | /* simply don't "or" in the access bit. */ | |
749 | break; | |
750 | default: | |
751 | error = err2; | |
752 | goto out; | |
753 | } | |
754 | } | |
755 | } | |
756 | *access = result; | |
757 | if (supported) | |
758 | *supported = sresult; | |
759 | ||
760 | out: | |
761 | return error; | |
762 | } | |
763 | #endif /* CONFIG_NFSD_V3 */ | |
764 | ||
105f4622 BF |
765 | static int nfsd_open_break_lease(struct inode *inode, int access) |
766 | { | |
767 | unsigned int mode; | |
1da177e4 | 768 | |
105f4622 BF |
769 | if (access & NFSD_MAY_NOT_BREAK_LEASE) |
770 | return 0; | |
771 | mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; | |
772 | return break_lease(inode, mode | O_NONBLOCK); | |
773 | } | |
1da177e4 LT |
774 | |
775 | /* | |
776 | * Open an existing file or directory. | |
999448a8 BS |
777 | * The may_flags argument indicates the type of open (read/write/lock) |
778 | * and additional flags. | |
1da177e4 LT |
779 | * N.B. After this call fhp needs an fh_put |
780 | */ | |
6264d69d | 781 | __be32 |
175a4eb7 | 782 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, |
999448a8 | 783 | int may_flags, struct file **filp) |
1da177e4 | 784 | { |
765927b2 | 785 | struct path path; |
1da177e4 | 786 | struct inode *inode; |
6264d69d AV |
787 | int flags = O_RDONLY|O_LARGEFILE; |
788 | __be32 err; | |
91885258 | 789 | int host_err = 0; |
1da177e4 | 790 | |
e0e81739 DH |
791 | validate_process_creds(); |
792 | ||
1da177e4 LT |
793 | /* |
794 | * If we get here, then the client has already done an "open", | |
795 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE | |
796 | * in case a chmod has now revoked permission. | |
d91d0b56 BF |
797 | * |
798 | * Arguably we should also allow the owner override for | |
799 | * directories, but we never have and it doesn't seem to have | |
800 | * caused anyone a problem. If we were to change this, note | |
801 | * also that our filldir callbacks would need a variant of | |
802 | * lookup_one_len that doesn't check permissions. | |
1da177e4 | 803 | */ |
d91d0b56 BF |
804 | if (type == S_IFREG) |
805 | may_flags |= NFSD_MAY_OWNER_OVERRIDE; | |
806 | err = fh_verify(rqstp, fhp, type, may_flags); | |
1da177e4 LT |
807 | if (err) |
808 | goto out; | |
809 | ||
765927b2 AV |
810 | path.mnt = fhp->fh_export->ex_path.mnt; |
811 | path.dentry = fhp->fh_dentry; | |
812 | inode = path.dentry->d_inode; | |
1da177e4 LT |
813 | |
814 | /* Disallow write access to files with the append-only bit set | |
815 | * or any access when mandatory locking enabled | |
816 | */ | |
817 | err = nfserr_perm; | |
999448a8 | 818 | if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) |
1da177e4 | 819 | goto out; |
5e7fc436 BF |
820 | /* |
821 | * We must ignore files (but only files) which might have mandatory | |
822 | * locks on them because there is no way to know if the accesser has | |
823 | * the lock. | |
824 | */ | |
825 | if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) | |
1da177e4 LT |
826 | goto out; |
827 | ||
828 | if (!inode->i_fop) | |
829 | goto out; | |
830 | ||
999448a8 | 831 | host_err = nfsd_open_break_lease(inode, may_flags); |
6264d69d | 832 | if (host_err) /* NOMEM or WOULDBLOCK */ |
1da177e4 LT |
833 | goto out_nfserr; |
834 | ||
999448a8 BS |
835 | if (may_flags & NFSD_MAY_WRITE) { |
836 | if (may_flags & NFSD_MAY_READ) | |
9ecb6a08 BF |
837 | flags = O_RDWR|O_LARGEFILE; |
838 | else | |
839 | flags = O_WRONLY|O_LARGEFILE; | |
1da177e4 | 840 | } |
765927b2 | 841 | *filp = dentry_open(&path, flags, current_cred()); |
ce4eb5e3 | 842 | if (IS_ERR(*filp)) { |
6264d69d | 843 | host_err = PTR_ERR(*filp); |
ce4eb5e3 HJ |
844 | *filp = NULL; |
845 | } else { | |
999448a8 BS |
846 | host_err = ima_file_check(*filp, may_flags); |
847 | ||
06effdbb BS |
848 | if (may_flags & NFSD_MAY_64BIT_COOKIE) |
849 | (*filp)->f_mode |= FMODE_64BITHASH; | |
850 | else | |
851 | (*filp)->f_mode |= FMODE_32BITHASH; | |
852 | } | |
853 | ||
1da177e4 | 854 | out_nfserr: |
6264d69d | 855 | err = nfserrno(host_err); |
1da177e4 | 856 | out: |
e0e81739 | 857 | validate_process_creds(); |
1da177e4 LT |
858 | return err; |
859 | } | |
860 | ||
861 | /* | |
862 | * Close a file. | |
863 | */ | |
864 | void | |
865 | nfsd_close(struct file *filp) | |
866 | { | |
867 | fput(filp); | |
868 | } | |
869 | ||
1da177e4 LT |
870 | /* |
871 | * Obtain the readahead parameters for the file | |
872 | * specified by (dev, ino). | |
873 | */ | |
1da177e4 LT |
874 | |
875 | static inline struct raparms * | |
876 | nfsd_get_raparms(dev_t dev, ino_t ino) | |
877 | { | |
878 | struct raparms *ra, **rap, **frap = NULL; | |
879 | int depth = 0; | |
fce1456a GB |
880 | unsigned int hash; |
881 | struct raparm_hbucket *rab; | |
882 | ||
883 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; | |
884 | rab = &raparm_hash[hash]; | |
1da177e4 | 885 | |
fce1456a GB |
886 | spin_lock(&rab->pb_lock); |
887 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { | |
1da177e4 LT |
888 | if (ra->p_ino == ino && ra->p_dev == dev) |
889 | goto found; | |
890 | depth++; | |
891 | if (ra->p_count == 0) | |
892 | frap = rap; | |
893 | } | |
3aa6e0aa | 894 | depth = nfsdstats.ra_size; |
1da177e4 | 895 | if (!frap) { |
fce1456a | 896 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
897 | return NULL; |
898 | } | |
899 | rap = frap; | |
900 | ra = *frap; | |
901 | ra->p_dev = dev; | |
902 | ra->p_ino = ino; | |
903 | ra->p_set = 0; | |
fce1456a | 904 | ra->p_hindex = hash; |
1da177e4 | 905 | found: |
fce1456a | 906 | if (rap != &rab->pb_head) { |
1da177e4 | 907 | *rap = ra->p_next; |
fce1456a GB |
908 | ra->p_next = rab->pb_head; |
909 | rab->pb_head = ra; | |
1da177e4 LT |
910 | } |
911 | ra->p_count++; | |
912 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; | |
fce1456a | 913 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
914 | return ra; |
915 | } | |
916 | ||
917 | /* | |
cf8208d0 JA |
918 | * Grab and keep cached pages associated with a file in the svc_rqst |
919 | * so that they can be passed to the network sendmsg/sendpage routines | |
920 | * directly. They will be released after the sending has completed. | |
1da177e4 LT |
921 | */ |
922 | static int | |
cf8208d0 JA |
923 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
924 | struct splice_desc *sd) | |
1da177e4 | 925 | { |
cf8208d0 | 926 | struct svc_rqst *rqstp = sd->u.data; |
afc59400 | 927 | struct page **pp = rqstp->rq_next_page; |
cf8208d0 JA |
928 | struct page *page = buf->page; |
929 | size_t size; | |
cf8208d0 JA |
930 | |
931 | size = sd->len; | |
1da177e4 LT |
932 | |
933 | if (rqstp->rq_res.page_len == 0) { | |
934 | get_page(page); | |
afc59400 BF |
935 | put_page(*rqstp->rq_next_page); |
936 | *(rqstp->rq_next_page++) = page; | |
cf8208d0 | 937 | rqstp->rq_res.page_base = buf->offset; |
1da177e4 | 938 | rqstp->rq_res.page_len = size; |
44524359 | 939 | } else if (page != pp[-1]) { |
1da177e4 | 940 | get_page(page); |
afc59400 BF |
941 | if (*rqstp->rq_next_page) |
942 | put_page(*rqstp->rq_next_page); | |
943 | *(rqstp->rq_next_page++) = page; | |
1da177e4 | 944 | rqstp->rq_res.page_len += size; |
44524359 | 945 | } else |
1da177e4 | 946 | rqstp->rq_res.page_len += size; |
1da177e4 | 947 | |
1da177e4 LT |
948 | return size; |
949 | } | |
950 | ||
cf8208d0 JA |
951 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
952 | struct splice_desc *sd) | |
953 | { | |
954 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
955 | } | |
956 | ||
6264d69d | 957 | static __be32 |
1da177e4 LT |
958 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
959 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) | |
960 | { | |
1da177e4 | 961 | mm_segment_t oldfs; |
6264d69d AV |
962 | __be32 err; |
963 | int host_err; | |
1da177e4 LT |
964 | |
965 | err = nfserr_perm; | |
a8754bee | 966 | |
cf8208d0 JA |
967 | if (file->f_op->splice_read && rqstp->rq_splice_ok) { |
968 | struct splice_desc sd = { | |
969 | .len = 0, | |
970 | .total_len = *count, | |
971 | .pos = offset, | |
972 | .u.data = rqstp, | |
973 | }; | |
974 | ||
afc59400 | 975 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
cf8208d0 | 976 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
1da177e4 LT |
977 | } else { |
978 | oldfs = get_fs(); | |
979 | set_fs(KERNEL_DS); | |
6264d69d | 980 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
1da177e4 LT |
981 | set_fs(oldfs); |
982 | } | |
983 | ||
6264d69d AV |
984 | if (host_err >= 0) { |
985 | nfsdstats.io_read += host_err; | |
986 | *count = host_err; | |
1da177e4 | 987 | err = 0; |
2a12a9d7 | 988 | fsnotify_access(file); |
1da177e4 | 989 | } else |
6264d69d | 990 | err = nfserrno(host_err); |
1da177e4 LT |
991 | return err; |
992 | } | |
993 | ||
9f708e40 NB |
994 | static void kill_suid(struct dentry *dentry) |
995 | { | |
996 | struct iattr ia; | |
b5376771 | 997 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; |
9f708e40 | 998 | |
1b1dcc1b | 999 | mutex_lock(&dentry->d_inode->i_mutex); |
9f708e40 | 1000 | notify_change(dentry, &ia); |
1b1dcc1b | 1001 | mutex_unlock(&dentry->d_inode->i_mutex); |
9f708e40 NB |
1002 | } |
1003 | ||
d911df7b BF |
1004 | /* |
1005 | * Gathered writes: If another process is currently writing to the file, | |
1006 | * there's a high chance this is another nfsd (triggered by a bulk write | |
1007 | * from a client's biod). Rather than syncing the file with each write | |
1008 | * request, we sleep for 10 msec. | |
1009 | * | |
1010 | * I don't know if this roughly approximates C. Juszak's idea of | |
1011 | * gathered writes, but it's a nice and simple solution (IMHO), and it | |
1012 | * seems to work:-) | |
1013 | * | |
1014 | * Note: we do this only in the NFSv2 case, since v3 and higher have a | |
1015 | * better tool (separate unstable writes and commits) for solving this | |
1016 | * problem. | |
1017 | */ | |
1018 | static int wait_for_concurrent_writes(struct file *file) | |
1019 | { | |
496ad9aa | 1020 | struct inode *inode = file_inode(file); |
d911df7b BF |
1021 | static ino_t last_ino; |
1022 | static dev_t last_dev; | |
1023 | int err = 0; | |
1024 | ||
1025 | if (atomic_read(&inode->i_writecount) > 1 | |
1026 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
1027 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); | |
1028 | msleep(10); | |
1029 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); | |
1030 | } | |
1031 | ||
1032 | if (inode->i_state & I_DIRTY) { | |
1033 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); | |
8018ab05 | 1034 | err = vfs_fsync(file, 0); |
d911df7b BF |
1035 | } |
1036 | last_ino = inode->i_ino; | |
1037 | last_dev = inode->i_sb->s_dev; | |
1038 | return err; | |
1039 | } | |
1040 | ||
6264d69d | 1041 | static __be32 |
1da177e4 LT |
1042 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1043 | loff_t offset, struct kvec *vec, int vlen, | |
31dec253 | 1044 | unsigned long *cnt, int *stablep) |
1da177e4 LT |
1045 | { |
1046 | struct svc_export *exp; | |
1047 | struct dentry *dentry; | |
1048 | struct inode *inode; | |
1049 | mm_segment_t oldfs; | |
6264d69d AV |
1050 | __be32 err = 0; |
1051 | int host_err; | |
1da177e4 | 1052 | int stable = *stablep; |
48e03bc5 | 1053 | int use_wgather; |
e49dbbf3 | 1054 | loff_t pos = offset; |
1da177e4 | 1055 | |
7eaa36e2 | 1056 | dentry = file->f_path.dentry; |
1da177e4 LT |
1057 | inode = dentry->d_inode; |
1058 | exp = fhp->fh_export; | |
1059 | ||
48e03bc5 | 1060 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
1da177e4 | 1061 | |
1da177e4 LT |
1062 | if (!EX_ISSYNC(exp)) |
1063 | stable = 0; | |
1da177e4 LT |
1064 | |
1065 | /* Write the data. */ | |
1066 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
e49dbbf3 | 1067 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos); |
1da177e4 | 1068 | set_fs(oldfs); |
e4636d53 BF |
1069 | if (host_err < 0) |
1070 | goto out_nfserr; | |
1071 | *cnt = host_err; | |
1072 | nfsdstats.io_write += host_err; | |
2a12a9d7 | 1073 | fsnotify_modify(file); |
1da177e4 LT |
1074 | |
1075 | /* clear setuid/setgid flag after write */ | |
e4636d53 | 1076 | if (inode->i_mode & (S_ISUID | S_ISGID)) |
9f708e40 | 1077 | kill_suid(dentry); |
1da177e4 | 1078 | |
face1502 BF |
1079 | if (stable) { |
1080 | if (use_wgather) | |
1081 | host_err = wait_for_concurrent_writes(file); | |
1082 | else | |
1083 | host_err = vfs_fsync_range(file, offset, offset+*cnt, 0); | |
1084 | } | |
1da177e4 | 1085 | |
e4636d53 | 1086 | out_nfserr: |
6264d69d | 1087 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
a0d24b29 | 1088 | if (host_err >= 0) |
1da177e4 | 1089 | err = 0; |
a0d24b29 | 1090 | else |
6264d69d | 1091 | err = nfserrno(host_err); |
1da177e4 LT |
1092 | return err; |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * Read data from a file. count must contain the requested read count | |
1097 | * on entry. On return, *count contains the number of bytes actually read. | |
1098 | * N.B. After this call fhp needs an fh_put | |
1099 | */ | |
039a87ca | 1100 | __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
fa0a2126 BF |
1101 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
1102 | { | |
1103 | struct file *file; | |
1104 | struct inode *inode; | |
1105 | struct raparms *ra; | |
1106 | __be32 err; | |
1107 | ||
1108 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); | |
1109 | if (err) | |
1110 | return err; | |
1111 | ||
496ad9aa | 1112 | inode = file_inode(file); |
fa0a2126 BF |
1113 | |
1114 | /* Get readahead parameters */ | |
1115 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); | |
1116 | ||
1117 | if (ra && ra->p_set) | |
1118 | file->f_ra = ra->p_ra; | |
1119 | ||
1120 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
1121 | ||
1122 | /* Write back readahead params */ | |
1123 | if (ra) { | |
1124 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; | |
1125 | spin_lock(&rab->pb_lock); | |
1126 | ra->p_ra = file->f_ra; | |
1127 | ra->p_set = 1; | |
1128 | ra->p_count--; | |
1129 | spin_unlock(&rab->pb_lock); | |
1130 | } | |
1131 | ||
1132 | nfsd_close(file); | |
1133 | return err; | |
1134 | } | |
1135 | ||
039a87ca | 1136 | /* As above, but use the provided file descriptor. */ |
6264d69d | 1137 | __be32 |
039a87ca | 1138 | nfsd_read_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1da177e4 LT |
1139 | loff_t offset, struct kvec *vec, int vlen, |
1140 | unsigned long *count) | |
1141 | { | |
6264d69d | 1142 | __be32 err; |
1da177e4 LT |
1143 | |
1144 | if (file) { | |
0ec757df | 1145 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
8837abca | 1146 | NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); |
1da177e4 LT |
1147 | if (err) |
1148 | goto out; | |
1149 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
039a87ca BF |
1150 | } else /* Note file may still be NULL in NFSv4 special stateid case: */ |
1151 | err = nfsd_read(rqstp, fhp, offset, vec, vlen, count); | |
1da177e4 LT |
1152 | out: |
1153 | return err; | |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Write data to a file. | |
1158 | * The stable flag requests synchronous writes. | |
1159 | * N.B. After this call fhp needs an fh_put | |
1160 | */ | |
6264d69d | 1161 | __be32 |
1da177e4 | 1162 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
31dec253 | 1163 | loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, |
1da177e4 LT |
1164 | int *stablep) |
1165 | { | |
6264d69d | 1166 | __be32 err = 0; |
1da177e4 LT |
1167 | |
1168 | if (file) { | |
0ec757df | 1169 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
8837abca | 1170 | NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); |
1da177e4 LT |
1171 | if (err) |
1172 | goto out; | |
1173 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, | |
1174 | stablep); | |
1175 | } else { | |
8837abca | 1176 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
1da177e4 LT |
1177 | if (err) |
1178 | goto out; | |
1179 | ||
1180 | if (cnt) | |
1181 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, | |
1182 | cnt, stablep); | |
1183 | nfsd_close(file); | |
1184 | } | |
1185 | out: | |
1186 | return err; | |
1187 | } | |
1188 | ||
1189 | #ifdef CONFIG_NFSD_V3 | |
1190 | /* | |
1191 | * Commit all pending writes to stable storage. | |
aa696a6f TM |
1192 | * |
1193 | * Note: we only guarantee that data that lies within the range specified | |
1194 | * by the 'offset' and 'count' parameters will be synced. | |
1da177e4 LT |
1195 | * |
1196 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1197 | * data to the client, as locking happens lower down in the filesystem. | |
1198 | */ | |
6264d69d | 1199 | __be32 |
1da177e4 LT |
1200 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1201 | loff_t offset, unsigned long count) | |
1202 | { | |
1203 | struct file *file; | |
aa696a6f TM |
1204 | loff_t end = LLONG_MAX; |
1205 | __be32 err = nfserr_inval; | |
1da177e4 | 1206 | |
aa696a6f TM |
1207 | if (offset < 0) |
1208 | goto out; | |
1209 | if (count != 0) { | |
1210 | end = offset + (loff_t)count - 1; | |
1211 | if (end < offset) | |
1212 | goto out; | |
1213 | } | |
1da177e4 | 1214 | |
91885258 JL |
1215 | err = nfsd_open(rqstp, fhp, S_IFREG, |
1216 | NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); | |
8837abca | 1217 | if (err) |
aa696a6f | 1218 | goto out; |
1da177e4 | 1219 | if (EX_ISSYNC(fhp->fh_export)) { |
8018ab05 | 1220 | int err2 = vfs_fsync_range(file, offset, end, 0); |
aa696a6f TM |
1221 | |
1222 | if (err2 != -EINVAL) | |
1223 | err = nfserrno(err2); | |
1224 | else | |
1da177e4 | 1225 | err = nfserr_notsupp; |
1da177e4 LT |
1226 | } |
1227 | ||
1228 | nfsd_close(file); | |
aa696a6f | 1229 | out: |
1da177e4 LT |
1230 | return err; |
1231 | } | |
1232 | #endif /* CONFIG_NFSD_V3 */ | |
1233 | ||
f2b0dee2 | 1234 | static __be32 |
5c002b3b BF |
1235 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, |
1236 | struct iattr *iap) | |
1237 | { | |
1238 | /* | |
1239 | * Mode has already been set earlier in create: | |
1240 | */ | |
1241 | iap->ia_valid &= ~ATTR_MODE; | |
1242 | /* | |
1243 | * Setting uid/gid works only for root. Irix appears to | |
1244 | * send along the gid on create when it tries to implement | |
1245 | * setgid directories via NFS: | |
1246 | */ | |
6fab8779 | 1247 | if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) |
5c002b3b BF |
1248 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
1249 | if (iap->ia_valid) | |
1250 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); | |
1251 | return 0; | |
1252 | } | |
1253 | ||
4ac35c2f | 1254 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
1255 | * setting size to 0 may fail for some specific file systems by the permission | |
1256 | * checking which requires WRITE permission but the mode is 000. | |
1257 | * we ignore the resizing(to 0) on the just new created file, since the size is | |
1258 | * 0 after file created. | |
1259 | * | |
1260 | * call this only after vfs_create() is called. | |
1261 | * */ | |
1262 | static void | |
1263 | nfsd_check_ignore_resizing(struct iattr *iap) | |
1264 | { | |
1265 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) | |
1266 | iap->ia_valid &= ~ATTR_SIZE; | |
1267 | } | |
1268 | ||
1da177e4 LT |
1269 | /* |
1270 | * Create a file (regular, directory, device, fifo); UNIX sockets | |
1271 | * not yet implemented. | |
1272 | * If the response fh has been verified, the parent directory should | |
1273 | * already be locked. Note that the parent directory is left locked. | |
1274 | * | |
1275 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1276 | */ | |
6264d69d | 1277 | __be32 |
1da177e4 LT |
1278 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1279 | char *fname, int flen, struct iattr *iap, | |
1280 | int type, dev_t rdev, struct svc_fh *resfhp) | |
1281 | { | |
1282 | struct dentry *dentry, *dchild = NULL; | |
1283 | struct inode *dirp; | |
6264d69d | 1284 | __be32 err; |
5c002b3b | 1285 | __be32 err2; |
6264d69d | 1286 | int host_err; |
1da177e4 LT |
1287 | |
1288 | err = nfserr_perm; | |
1289 | if (!flen) | |
1290 | goto out; | |
1291 | err = nfserr_exist; | |
1292 | if (isdotent(fname, flen)) | |
1293 | goto out; | |
1294 | ||
8837abca | 1295 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1296 | if (err) |
1297 | goto out; | |
1298 | ||
1299 | dentry = fhp->fh_dentry; | |
1300 | dirp = dentry->d_inode; | |
1301 | ||
1302 | err = nfserr_notdir; | |
acfa4380 | 1303 | if (!dirp->i_op->lookup) |
1da177e4 LT |
1304 | goto out; |
1305 | /* | |
1306 | * Check whether the response file handle has been verified yet. | |
1307 | * If it has, the parent directory should already be locked. | |
1308 | */ | |
1309 | if (!resfhp->fh_dentry) { | |
4a55c101 JK |
1310 | host_err = fh_want_write(fhp); |
1311 | if (host_err) | |
1312 | goto out_nfserr; | |
1313 | ||
1da177e4 | 1314 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ |
12fd3520 | 1315 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 | 1316 | dchild = lookup_one_len(fname, dentry, flen); |
6264d69d | 1317 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1318 | if (IS_ERR(dchild)) |
1319 | goto out_nfserr; | |
1320 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
1321 | if (err) | |
1322 | goto out; | |
1323 | } else { | |
1324 | /* called from nfsd_proc_create */ | |
1325 | dchild = dget(resfhp->fh_dentry); | |
1326 | if (!fhp->fh_locked) { | |
1327 | /* not actually possible */ | |
1328 | printk(KERN_ERR | |
1329 | "nfsd_create: parent %s/%s not locked!\n", | |
1330 | dentry->d_parent->d_name.name, | |
1331 | dentry->d_name.name); | |
d75f2b9f | 1332 | err = nfserr_io; |
1da177e4 LT |
1333 | goto out; |
1334 | } | |
1335 | } | |
1336 | /* | |
1337 | * Make sure the child dentry is still negative ... | |
1338 | */ | |
1339 | err = nfserr_exist; | |
1340 | if (dchild->d_inode) { | |
1341 | dprintk("nfsd_create: dentry %s/%s not negative!\n", | |
1342 | dentry->d_name.name, dchild->d_name.name); | |
1343 | goto out; | |
1344 | } | |
1345 | ||
1346 | if (!(iap->ia_valid & ATTR_MODE)) | |
1347 | iap->ia_mode = 0; | |
1348 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1349 | ||
07cad1d2 MS |
1350 | err = nfserr_inval; |
1351 | if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { | |
1352 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", | |
1353 | type); | |
1354 | goto out; | |
1355 | } | |
1356 | ||
1da177e4 LT |
1357 | /* |
1358 | * Get the dir op function pointer. | |
1359 | */ | |
088406bc | 1360 | err = 0; |
4a55c101 | 1361 | host_err = 0; |
1da177e4 LT |
1362 | switch (type) { |
1363 | case S_IFREG: | |
312b63fb | 1364 | host_err = vfs_create(dirp, dchild, iap->ia_mode, true); |
4ac35c2f | 1365 | if (!host_err) |
1366 | nfsd_check_ignore_resizing(iap); | |
1da177e4 LT |
1367 | break; |
1368 | case S_IFDIR: | |
6264d69d | 1369 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
1da177e4 LT |
1370 | break; |
1371 | case S_IFCHR: | |
1372 | case S_IFBLK: | |
1373 | case S_IFIFO: | |
1374 | case S_IFSOCK: | |
6264d69d | 1375 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
1da177e4 | 1376 | break; |
1da177e4 | 1377 | } |
4a55c101 | 1378 | if (host_err < 0) |
1da177e4 LT |
1379 | goto out_nfserr; |
1380 | ||
f501912a | 1381 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
1da177e4 | 1382 | |
f501912a BM |
1383 | /* |
1384 | * nfsd_setattr already committed the child. Transactional filesystems | |
1385 | * had a chance to commit changes for both parent and child | |
1386 | * simultaneously making the following commit_metadata a noop. | |
1387 | */ | |
1388 | err2 = nfserrno(commit_metadata(fhp)); | |
5c002b3b BF |
1389 | if (err2) |
1390 | err = err2; | |
1da177e4 LT |
1391 | /* |
1392 | * Update the file handle to get the new inode info. | |
1393 | */ | |
1394 | if (!err) | |
1395 | err = fh_update(resfhp); | |
1396 | out: | |
1397 | if (dchild && !IS_ERR(dchild)) | |
1398 | dput(dchild); | |
1399 | return err; | |
1400 | ||
1401 | out_nfserr: | |
6264d69d | 1402 | err = nfserrno(host_err); |
1da177e4 LT |
1403 | goto out; |
1404 | } | |
1405 | ||
1406 | #ifdef CONFIG_NFSD_V3 | |
ac6721a1 MJ |
1407 | |
1408 | static inline int nfsd_create_is_exclusive(int createmode) | |
1409 | { | |
1410 | return createmode == NFS3_CREATE_EXCLUSIVE | |
1411 | || createmode == NFS4_CREATE_EXCLUSIVE4_1; | |
1412 | } | |
1413 | ||
1da177e4 | 1414 | /* |
ac6721a1 | 1415 | * NFSv3 and NFSv4 version of nfsd_create |
1da177e4 | 1416 | */ |
6264d69d | 1417 | __be32 |
ac6721a1 | 1418 | do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1da177e4 LT |
1419 | char *fname, int flen, struct iattr *iap, |
1420 | struct svc_fh *resfhp, int createmode, u32 *verifier, | |
856121b2 | 1421 | bool *truncp, bool *created) |
1da177e4 LT |
1422 | { |
1423 | struct dentry *dentry, *dchild = NULL; | |
1424 | struct inode *dirp; | |
6264d69d AV |
1425 | __be32 err; |
1426 | int host_err; | |
1da177e4 | 1427 | __u32 v_mtime=0, v_atime=0; |
1da177e4 LT |
1428 | |
1429 | err = nfserr_perm; | |
1430 | if (!flen) | |
1431 | goto out; | |
1432 | err = nfserr_exist; | |
1433 | if (isdotent(fname, flen)) | |
1434 | goto out; | |
1435 | if (!(iap->ia_valid & ATTR_MODE)) | |
1436 | iap->ia_mode = 0; | |
1574dff8 | 1437 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
1da177e4 LT |
1438 | if (err) |
1439 | goto out; | |
1440 | ||
1441 | dentry = fhp->fh_dentry; | |
1442 | dirp = dentry->d_inode; | |
1443 | ||
1444 | /* Get all the sanity checks out of the way before | |
1445 | * we lock the parent. */ | |
1446 | err = nfserr_notdir; | |
acfa4380 | 1447 | if (!dirp->i_op->lookup) |
1da177e4 | 1448 | goto out; |
4a55c101 JK |
1449 | |
1450 | host_err = fh_want_write(fhp); | |
1451 | if (host_err) | |
1452 | goto out_nfserr; | |
1453 | ||
12fd3520 | 1454 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1455 | |
1456 | /* | |
1457 | * Compose the response file handle. | |
1458 | */ | |
1459 | dchild = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1460 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1461 | if (IS_ERR(dchild)) |
1462 | goto out_nfserr; | |
1463 | ||
1574dff8 SP |
1464 | /* If file doesn't exist, check for permissions to create one */ |
1465 | if (!dchild->d_inode) { | |
1466 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); | |
1467 | if (err) | |
1468 | goto out; | |
1469 | } | |
1470 | ||
1da177e4 LT |
1471 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
1472 | if (err) | |
1473 | goto out; | |
1474 | ||
ac6721a1 | 1475 | if (nfsd_create_is_exclusive(createmode)) { |
c397852c | 1476 | /* solaris7 gets confused (bugid 4218508) if these have |
749997e5 JL |
1477 | * the high bit set, so just clear the high bits. If this is |
1478 | * ever changed to use different attrs for storing the | |
1479 | * verifier, then do_open_lookup() will also need to be fixed | |
1480 | * accordingly. | |
1da177e4 LT |
1481 | */ |
1482 | v_mtime = verifier[0]&0x7fffffff; | |
1483 | v_atime = verifier[1]&0x7fffffff; | |
1da177e4 LT |
1484 | } |
1485 | ||
1486 | if (dchild->d_inode) { | |
1487 | err = 0; | |
1488 | ||
1489 | switch (createmode) { | |
1490 | case NFS3_CREATE_UNCHECKED: | |
1491 | if (! S_ISREG(dchild->d_inode->i_mode)) | |
9dc4e6c4 | 1492 | goto out; |
1da177e4 LT |
1493 | else if (truncp) { |
1494 | /* in nfsv4, we need to treat this case a little | |
1495 | * differently. we don't want to truncate the | |
1496 | * file now; this would be wrong if the OPEN | |
1497 | * fails for some other reason. furthermore, | |
1498 | * if the size is nonzero, we should ignore it | |
1499 | * according to spec! | |
1500 | */ | |
1501 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; | |
1502 | } | |
1503 | else { | |
1504 | iap->ia_valid &= ATTR_SIZE; | |
1505 | goto set_attr; | |
1506 | } | |
1507 | break; | |
1508 | case NFS3_CREATE_EXCLUSIVE: | |
1509 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime | |
1510 | && dchild->d_inode->i_atime.tv_sec == v_atime | |
7007c90f NB |
1511 | && dchild->d_inode->i_size == 0 ) { |
1512 | if (created) | |
1513 | *created = 1; | |
1da177e4 | 1514 | break; |
7007c90f | 1515 | } |
ac6721a1 MJ |
1516 | case NFS4_CREATE_EXCLUSIVE4_1: |
1517 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime | |
1518 | && dchild->d_inode->i_atime.tv_sec == v_atime | |
7007c90f NB |
1519 | && dchild->d_inode->i_size == 0 ) { |
1520 | if (created) | |
1521 | *created = 1; | |
ac6721a1 | 1522 | goto set_attr; |
7007c90f | 1523 | } |
1da177e4 LT |
1524 | /* fallthru */ |
1525 | case NFS3_CREATE_GUARDED: | |
1526 | err = nfserr_exist; | |
1527 | } | |
bad0dcff | 1528 | fh_drop_write(fhp); |
1da177e4 LT |
1529 | goto out; |
1530 | } | |
1531 | ||
312b63fb | 1532 | host_err = vfs_create(dirp, dchild, iap->ia_mode, true); |
463c3197 | 1533 | if (host_err < 0) { |
bad0dcff | 1534 | fh_drop_write(fhp); |
1da177e4 | 1535 | goto out_nfserr; |
463c3197 | 1536 | } |
81ac95c5 BF |
1537 | if (created) |
1538 | *created = 1; | |
1da177e4 | 1539 | |
4ac35c2f | 1540 | nfsd_check_ignore_resizing(iap); |
1541 | ||
ac6721a1 | 1542 | if (nfsd_create_is_exclusive(createmode)) { |
c397852c | 1543 | /* Cram the verifier into atime/mtime */ |
1da177e4 | 1544 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
c397852c | 1545 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
1da177e4 LT |
1546 | /* XXX someone who knows this better please fix it for nsec */ |
1547 | iap->ia_mtime.tv_sec = v_mtime; | |
1548 | iap->ia_atime.tv_sec = v_atime; | |
1549 | iap->ia_mtime.tv_nsec = 0; | |
1550 | iap->ia_atime.tv_nsec = 0; | |
1da177e4 LT |
1551 | } |
1552 | ||
1da177e4 | 1553 | set_attr: |
f501912a BM |
1554 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
1555 | ||
1556 | /* | |
1557 | * nfsd_setattr already committed the child (and possibly also the parent). | |
1558 | */ | |
1559 | if (!err) | |
1560 | err = nfserrno(commit_metadata(fhp)); | |
f193fbab YT |
1561 | |
1562 | /* | |
1563 | * Update the filehandle to get the new inode info. | |
1564 | */ | |
1565 | if (!err) | |
1566 | err = fh_update(resfhp); | |
1da177e4 LT |
1567 | |
1568 | out: | |
1569 | fh_unlock(fhp); | |
1570 | if (dchild && !IS_ERR(dchild)) | |
1571 | dput(dchild); | |
4a55c101 | 1572 | fh_drop_write(fhp); |
1da177e4 LT |
1573 | return err; |
1574 | ||
1575 | out_nfserr: | |
6264d69d | 1576 | err = nfserrno(host_err); |
1da177e4 LT |
1577 | goto out; |
1578 | } | |
1579 | #endif /* CONFIG_NFSD_V3 */ | |
1580 | ||
1581 | /* | |
1582 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1583 | * fits into the buffer. On return, it contains the true length. | |
1584 | * N.B. After this call fhp needs an fh_put | |
1585 | */ | |
6264d69d | 1586 | __be32 |
1da177e4 LT |
1587 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1588 | { | |
1da177e4 LT |
1589 | struct inode *inode; |
1590 | mm_segment_t oldfs; | |
6264d69d AV |
1591 | __be32 err; |
1592 | int host_err; | |
68ac1234 | 1593 | struct path path; |
1da177e4 | 1594 | |
8837abca | 1595 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
1da177e4 LT |
1596 | if (err) |
1597 | goto out; | |
1598 | ||
68ac1234 AV |
1599 | path.mnt = fhp->fh_export->ex_path.mnt; |
1600 | path.dentry = fhp->fh_dentry; | |
1601 | inode = path.dentry->d_inode; | |
1da177e4 LT |
1602 | |
1603 | err = nfserr_inval; | |
acfa4380 | 1604 | if (!inode->i_op->readlink) |
1da177e4 LT |
1605 | goto out; |
1606 | ||
68ac1234 | 1607 | touch_atime(&path); |
1da177e4 LT |
1608 | /* N.B. Why does this call need a get_fs()?? |
1609 | * Remove the set_fs and watch the fireworks:-) --okir | |
1610 | */ | |
1611 | ||
1612 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
fac7a17b | 1613 | host_err = inode->i_op->readlink(path.dentry, (char __user *)buf, *lenp); |
1da177e4 LT |
1614 | set_fs(oldfs); |
1615 | ||
6264d69d | 1616 | if (host_err < 0) |
1da177e4 | 1617 | goto out_nfserr; |
6264d69d | 1618 | *lenp = host_err; |
1da177e4 LT |
1619 | err = 0; |
1620 | out: | |
1621 | return err; | |
1622 | ||
1623 | out_nfserr: | |
6264d69d | 1624 | err = nfserrno(host_err); |
1da177e4 LT |
1625 | goto out; |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * Create a symlink and look up its inode | |
1630 | * N.B. After this call _both_ fhp and resfhp need an fh_put | |
1631 | */ | |
6264d69d | 1632 | __be32 |
1da177e4 LT |
1633 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1634 | char *fname, int flen, | |
1635 | char *path, int plen, | |
1636 | struct svc_fh *resfhp, | |
1637 | struct iattr *iap) | |
1638 | { | |
1639 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1640 | __be32 err, cerr; |
1641 | int host_err; | |
1da177e4 LT |
1642 | |
1643 | err = nfserr_noent; | |
1644 | if (!flen || !plen) | |
1645 | goto out; | |
1646 | err = nfserr_exist; | |
1647 | if (isdotent(fname, flen)) | |
1648 | goto out; | |
1649 | ||
8837abca | 1650 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1651 | if (err) |
1652 | goto out; | |
4a55c101 JK |
1653 | |
1654 | host_err = fh_want_write(fhp); | |
1655 | if (host_err) | |
1656 | goto out_nfserr; | |
1657 | ||
1da177e4 LT |
1658 | fh_lock(fhp); |
1659 | dentry = fhp->fh_dentry; | |
1660 | dnew = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1661 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1662 | if (IS_ERR(dnew)) |
1663 | goto out_nfserr; | |
1664 | ||
1da177e4 LT |
1665 | if (unlikely(path[plen] != 0)) { |
1666 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); | |
1667 | if (path_alloced == NULL) | |
6264d69d | 1668 | host_err = -ENOMEM; |
1da177e4 LT |
1669 | else { |
1670 | strncpy(path_alloced, path, plen); | |
1671 | path_alloced[plen] = 0; | |
db2e747b | 1672 | host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); |
1da177e4 LT |
1673 | kfree(path_alloced); |
1674 | } | |
1675 | } else | |
db2e747b | 1676 | host_err = vfs_symlink(dentry->d_inode, dnew, path); |
6264d69d | 1677 | err = nfserrno(host_err); |
f501912a BM |
1678 | if (!err) |
1679 | err = nfserrno(commit_metadata(fhp)); | |
1da177e4 LT |
1680 | fh_unlock(fhp); |
1681 | ||
bad0dcff | 1682 | fh_drop_write(fhp); |
75c3f29d | 1683 | |
1da177e4 LT |
1684 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
1685 | dput(dnew); | |
1686 | if (err==0) err = cerr; | |
1687 | out: | |
1688 | return err; | |
1689 | ||
1690 | out_nfserr: | |
6264d69d | 1691 | err = nfserrno(host_err); |
1da177e4 LT |
1692 | goto out; |
1693 | } | |
1694 | ||
1695 | /* | |
1696 | * Create a hardlink | |
1697 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1698 | */ | |
6264d69d | 1699 | __be32 |
1da177e4 LT |
1700 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1701 | char *name, int len, struct svc_fh *tfhp) | |
1702 | { | |
1703 | struct dentry *ddir, *dnew, *dold; | |
55b13354 | 1704 | struct inode *dirp; |
6264d69d AV |
1705 | __be32 err; |
1706 | int host_err; | |
1da177e4 | 1707 | |
8837abca | 1708 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1709 | if (err) |
1710 | goto out; | |
7d818a7b | 1711 | err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
1712 | if (err) |
1713 | goto out; | |
7d818a7b BF |
1714 | err = nfserr_isdir; |
1715 | if (S_ISDIR(tfhp->fh_dentry->d_inode->i_mode)) | |
1716 | goto out; | |
1da177e4 LT |
1717 | err = nfserr_perm; |
1718 | if (!len) | |
1719 | goto out; | |
1720 | err = nfserr_exist; | |
1721 | if (isdotent(name, len)) | |
1722 | goto out; | |
1723 | ||
4a55c101 JK |
1724 | host_err = fh_want_write(tfhp); |
1725 | if (host_err) { | |
1726 | err = nfserrno(host_err); | |
1727 | goto out; | |
1728 | } | |
1729 | ||
12fd3520 | 1730 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
1da177e4 LT |
1731 | ddir = ffhp->fh_dentry; |
1732 | dirp = ddir->d_inode; | |
1733 | ||
1734 | dnew = lookup_one_len(name, ddir, len); | |
6264d69d | 1735 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1736 | if (IS_ERR(dnew)) |
1737 | goto out_nfserr; | |
1738 | ||
1739 | dold = tfhp->fh_dentry; | |
1da177e4 | 1740 | |
4795bb37 BF |
1741 | err = nfserr_noent; |
1742 | if (!dold->d_inode) | |
4a55c101 | 1743 | goto out_dput; |
4795bb37 | 1744 | host_err = nfsd_break_lease(dold->d_inode); |
7d751f6f CB |
1745 | if (host_err) { |
1746 | err = nfserrno(host_err); | |
4a55c101 | 1747 | goto out_dput; |
7d751f6f | 1748 | } |
6264d69d AV |
1749 | host_err = vfs_link(dold, dirp, dnew); |
1750 | if (!host_err) { | |
f501912a BM |
1751 | err = nfserrno(commit_metadata(ffhp)); |
1752 | if (!err) | |
1753 | err = nfserrno(commit_metadata(tfhp)); | |
1da177e4 | 1754 | } else { |
6264d69d | 1755 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1756 | err = nfserr_acces; |
1757 | else | |
6264d69d | 1758 | err = nfserrno(host_err); |
1da177e4 | 1759 | } |
75c3f29d | 1760 | out_dput: |
1da177e4 | 1761 | dput(dnew); |
270d56e5 DR |
1762 | out_unlock: |
1763 | fh_unlock(ffhp); | |
4a55c101 | 1764 | fh_drop_write(tfhp); |
1da177e4 LT |
1765 | out: |
1766 | return err; | |
1767 | ||
1768 | out_nfserr: | |
6264d69d | 1769 | err = nfserrno(host_err); |
270d56e5 | 1770 | goto out_unlock; |
1da177e4 LT |
1771 | } |
1772 | ||
1773 | /* | |
1774 | * Rename a file | |
1775 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1776 | */ | |
6264d69d | 1777 | __be32 |
1da177e4 LT |
1778 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1779 | struct svc_fh *tfhp, char *tname, int tlen) | |
1780 | { | |
1781 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1782 | struct inode *fdir, *tdir; | |
6264d69d AV |
1783 | __be32 err; |
1784 | int host_err; | |
1da177e4 | 1785 | |
8837abca | 1786 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1787 | if (err) |
1788 | goto out; | |
8837abca | 1789 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1790 | if (err) |
1791 | goto out; | |
1792 | ||
1793 | fdentry = ffhp->fh_dentry; | |
1794 | fdir = fdentry->d_inode; | |
1795 | ||
1796 | tdentry = tfhp->fh_dentry; | |
1797 | tdir = tdentry->d_inode; | |
1798 | ||
1da177e4 LT |
1799 | err = nfserr_perm; |
1800 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1801 | goto out; | |
1802 | ||
4a55c101 JK |
1803 | host_err = fh_want_write(ffhp); |
1804 | if (host_err) { | |
1805 | err = nfserrno(host_err); | |
1806 | goto out; | |
1807 | } | |
1808 | ||
1da177e4 LT |
1809 | /* cannot use fh_lock as we need deadlock protective ordering |
1810 | * so do it by hand */ | |
1811 | trap = lock_rename(tdentry, fdentry); | |
1812 | ffhp->fh_locked = tfhp->fh_locked = 1; | |
1813 | fill_pre_wcc(ffhp); | |
1814 | fill_pre_wcc(tfhp); | |
1815 | ||
1816 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1817 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1818 | if (IS_ERR(odentry)) |
1819 | goto out_nfserr; | |
1820 | ||
6264d69d | 1821 | host_err = -ENOENT; |
1da177e4 LT |
1822 | if (!odentry->d_inode) |
1823 | goto out_dput_old; | |
6264d69d | 1824 | host_err = -EINVAL; |
1da177e4 LT |
1825 | if (odentry == trap) |
1826 | goto out_dput_old; | |
1827 | ||
1828 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1829 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1830 | if (IS_ERR(ndentry)) |
1831 | goto out_dput_old; | |
6264d69d | 1832 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1833 | if (ndentry == trap) |
1834 | goto out_dput_new; | |
1835 | ||
9079b1eb DH |
1836 | host_err = -EXDEV; |
1837 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) | |
1838 | goto out_dput_new; | |
aa387d6c BF |
1839 | if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) |
1840 | goto out_dput_new; | |
9079b1eb | 1841 | |
4795bb37 | 1842 | host_err = nfsd_break_lease(odentry->d_inode); |
83f6b0c1 | 1843 | if (host_err) |
4a55c101 | 1844 | goto out_dput_new; |
83f6b0c1 BF |
1845 | if (ndentry->d_inode) { |
1846 | host_err = nfsd_break_lease(ndentry->d_inode); | |
1847 | if (host_err) | |
4a55c101 | 1848 | goto out_dput_new; |
83f6b0c1 | 1849 | } |
6264d69d | 1850 | host_err = vfs_rename(fdir, odentry, tdir, ndentry); |
f501912a BM |
1851 | if (!host_err) { |
1852 | host_err = commit_metadata(tfhp); | |
6264d69d | 1853 | if (!host_err) |
f501912a | 1854 | host_err = commit_metadata(ffhp); |
1da177e4 | 1855 | } |
1da177e4 LT |
1856 | out_dput_new: |
1857 | dput(ndentry); | |
1858 | out_dput_old: | |
1859 | dput(odentry); | |
1860 | out_nfserr: | |
6264d69d | 1861 | err = nfserrno(host_err); |
1da177e4 LT |
1862 | |
1863 | /* we cannot reply on fh_unlock on the two filehandles, | |
1864 | * as that would do the wrong thing if the two directories | |
1865 | * were the same, so again we do it by hand | |
1866 | */ | |
1867 | fill_post_wcc(ffhp); | |
1868 | fill_post_wcc(tfhp); | |
1869 | unlock_rename(tdentry, fdentry); | |
1870 | ffhp->fh_locked = tfhp->fh_locked = 0; | |
4a55c101 | 1871 | fh_drop_write(ffhp); |
1da177e4 LT |
1872 | |
1873 | out: | |
1874 | return err; | |
1875 | } | |
1876 | ||
1877 | /* | |
1878 | * Unlink a file or directory | |
1879 | * N.B. After this call fhp needs an fh_put | |
1880 | */ | |
6264d69d | 1881 | __be32 |
1da177e4 LT |
1882 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1883 | char *fname, int flen) | |
1884 | { | |
1885 | struct dentry *dentry, *rdentry; | |
1886 | struct inode *dirp; | |
6264d69d AV |
1887 | __be32 err; |
1888 | int host_err; | |
1da177e4 LT |
1889 | |
1890 | err = nfserr_acces; | |
1891 | if (!flen || isdotent(fname, flen)) | |
1892 | goto out; | |
8837abca | 1893 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1894 | if (err) |
1895 | goto out; | |
1896 | ||
4a55c101 JK |
1897 | host_err = fh_want_write(fhp); |
1898 | if (host_err) | |
1899 | goto out_nfserr; | |
1900 | ||
12fd3520 | 1901 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1902 | dentry = fhp->fh_dentry; |
1903 | dirp = dentry->d_inode; | |
1904 | ||
1905 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1906 | host_err = PTR_ERR(rdentry); |
1da177e4 LT |
1907 | if (IS_ERR(rdentry)) |
1908 | goto out_nfserr; | |
1909 | ||
1910 | if (!rdentry->d_inode) { | |
1911 | dput(rdentry); | |
1912 | err = nfserr_noent; | |
1913 | goto out; | |
1914 | } | |
1915 | ||
1916 | if (!type) | |
1917 | type = rdentry->d_inode->i_mode & S_IFMT; | |
1918 | ||
4795bb37 BF |
1919 | host_err = nfsd_break_lease(rdentry->d_inode); |
1920 | if (host_err) | |
4a55c101 | 1921 | goto out_put; |
9ce137ee | 1922 | if (type != S_IFDIR) |
6264d69d | 1923 | host_err = vfs_unlink(dirp, rdentry); |
9ce137ee | 1924 | else |
6264d69d | 1925 | host_err = vfs_rmdir(dirp, rdentry); |
f501912a BM |
1926 | if (!host_err) |
1927 | host_err = commit_metadata(fhp); | |
541ce98c BF |
1928 | out_put: |
1929 | dput(rdentry); | |
1930 | ||
1da177e4 | 1931 | out_nfserr: |
6264d69d | 1932 | err = nfserrno(host_err); |
f193fbab YT |
1933 | out: |
1934 | return err; | |
1da177e4 LT |
1935 | } |
1936 | ||
14f7dd63 DW |
1937 | /* |
1938 | * We do this buffering because we must not call back into the file | |
1939 | * system's ->lookup() method from the filldir callback. That may well | |
1940 | * deadlock a number of file systems. | |
1941 | * | |
1942 | * This is based heavily on the implementation of same in XFS. | |
1943 | */ | |
1944 | struct buffered_dirent { | |
1945 | u64 ino; | |
1946 | loff_t offset; | |
1947 | int namlen; | |
1948 | unsigned int d_type; | |
1949 | char name[]; | |
1950 | }; | |
1951 | ||
1952 | struct readdir_data { | |
0f837692 | 1953 | struct dir_context ctx; |
14f7dd63 DW |
1954 | char *dirent; |
1955 | size_t used; | |
53c9c5c0 | 1956 | int full; |
14f7dd63 DW |
1957 | }; |
1958 | ||
1959 | static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, | |
1960 | loff_t offset, u64 ino, unsigned int d_type) | |
1961 | { | |
1962 | struct readdir_data *buf = __buf; | |
1963 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); | |
1964 | unsigned int reclen; | |
1965 | ||
1966 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); | |
53c9c5c0 AV |
1967 | if (buf->used + reclen > PAGE_SIZE) { |
1968 | buf->full = 1; | |
14f7dd63 | 1969 | return -EINVAL; |
53c9c5c0 | 1970 | } |
14f7dd63 DW |
1971 | |
1972 | de->namlen = namlen; | |
1973 | de->offset = offset; | |
1974 | de->ino = ino; | |
1975 | de->d_type = d_type; | |
1976 | memcpy(de->name, name, namlen); | |
1977 | buf->used += reclen; | |
1978 | ||
1979 | return 0; | |
1980 | } | |
1981 | ||
2f9092e1 DW |
1982 | static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, |
1983 | struct readdir_cd *cdp, loff_t *offsetp) | |
2628b766 | 1984 | { |
14f7dd63 DW |
1985 | struct readdir_data buf; |
1986 | struct buffered_dirent *de; | |
2628b766 | 1987 | int host_err; |
14f7dd63 DW |
1988 | int size; |
1989 | loff_t offset; | |
2628b766 | 1990 | |
0f837692 | 1991 | buf.ctx.actor = nfsd_buffered_filldir; |
14f7dd63 DW |
1992 | buf.dirent = (void *)__get_free_page(GFP_KERNEL); |
1993 | if (!buf.dirent) | |
2f9092e1 | 1994 | return nfserrno(-ENOMEM); |
14f7dd63 DW |
1995 | |
1996 | offset = *offsetp; | |
2628b766 | 1997 | |
14f7dd63 | 1998 | while (1) { |
496ad9aa | 1999 | struct inode *dir_inode = file_inode(file); |
14f7dd63 DW |
2000 | unsigned int reclen; |
2001 | ||
b726e923 | 2002 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
14f7dd63 | 2003 | buf.used = 0; |
53c9c5c0 | 2004 | buf.full = 0; |
14f7dd63 | 2005 | |
0f837692 | 2006 | host_err = iterate_dir(file, &buf.ctx); |
53c9c5c0 AV |
2007 | if (buf.full) |
2008 | host_err = 0; | |
2009 | ||
2010 | if (host_err < 0) | |
14f7dd63 DW |
2011 | break; |
2012 | ||
2013 | size = buf.used; | |
2014 | ||
2015 | if (!size) | |
2016 | break; | |
2017 | ||
2f9092e1 DW |
2018 | /* |
2019 | * Various filldir functions may end up calling back into | |
2020 | * lookup_one_len() and the file system's ->lookup() method. | |
2021 | * These expect i_mutex to be held, as it would within readdir. | |
2022 | */ | |
2023 | host_err = mutex_lock_killable(&dir_inode->i_mutex); | |
2024 | if (host_err) | |
2025 | break; | |
2026 | ||
14f7dd63 DW |
2027 | de = (struct buffered_dirent *)buf.dirent; |
2028 | while (size > 0) { | |
2029 | offset = de->offset; | |
2030 | ||
2031 | if (func(cdp, de->name, de->namlen, de->offset, | |
2032 | de->ino, de->d_type)) | |
2f9092e1 | 2033 | break; |
14f7dd63 DW |
2034 | |
2035 | if (cdp->err != nfs_ok) | |
2f9092e1 | 2036 | break; |
14f7dd63 DW |
2037 | |
2038 | reclen = ALIGN(sizeof(*de) + de->namlen, | |
2039 | sizeof(u64)); | |
2040 | size -= reclen; | |
2041 | de = (struct buffered_dirent *)((char *)de + reclen); | |
2042 | } | |
2f9092e1 DW |
2043 | mutex_unlock(&dir_inode->i_mutex); |
2044 | if (size > 0) /* We bailed out early */ | |
2045 | break; | |
2046 | ||
c002a6c7 | 2047 | offset = vfs_llseek(file, 0, SEEK_CUR); |
14f7dd63 DW |
2048 | } |
2049 | ||
14f7dd63 | 2050 | free_page((unsigned long)(buf.dirent)); |
2628b766 DW |
2051 | |
2052 | if (host_err) | |
2053 | return nfserrno(host_err); | |
14f7dd63 DW |
2054 | |
2055 | *offsetp = offset; | |
2056 | return cdp->err; | |
2628b766 DW |
2057 | } |
2058 | ||
1da177e4 LT |
2059 | /* |
2060 | * Read entries from a directory. | |
2061 | * The NFSv3/4 verifier we ignore for now. | |
2062 | */ | |
6264d69d | 2063 | __be32 |
1da177e4 | 2064 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
a0ad13ef | 2065 | struct readdir_cd *cdp, filldir_t func) |
1da177e4 | 2066 | { |
6264d69d | 2067 | __be32 err; |
1da177e4 LT |
2068 | struct file *file; |
2069 | loff_t offset = *offsetp; | |
06effdbb BS |
2070 | int may_flags = NFSD_MAY_READ; |
2071 | ||
2072 | /* NFSv2 only supports 32 bit cookies */ | |
2073 | if (rqstp->rq_vers > 2) | |
2074 | may_flags |= NFSD_MAY_64BIT_COOKIE; | |
1da177e4 | 2075 | |
06effdbb | 2076 | err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); |
1da177e4 LT |
2077 | if (err) |
2078 | goto out; | |
2079 | ||
b108fe6b | 2080 | offset = vfs_llseek(file, offset, SEEK_SET); |
1da177e4 LT |
2081 | if (offset < 0) { |
2082 | err = nfserrno((int)offset); | |
2083 | goto out_close; | |
2084 | } | |
2085 | ||
14f7dd63 | 2086 | err = nfsd_buffered_readdir(file, func, cdp, offsetp); |
1da177e4 LT |
2087 | |
2088 | if (err == nfserr_eof || err == nfserr_toosmall) | |
2089 | err = nfs_ok; /* can still be found in ->err */ | |
2090 | out_close: | |
2091 | nfsd_close(file); | |
2092 | out: | |
2093 | return err; | |
2094 | } | |
2095 | ||
2096 | /* | |
2097 | * Get file system stats | |
2098 | * N.B. After this call fhp needs an fh_put | |
2099 | */ | |
6264d69d | 2100 | __be32 |
04716e66 | 2101 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) |
1da177e4 | 2102 | { |
ebabe9a9 CH |
2103 | __be32 err; |
2104 | ||
2105 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); | |
f6360efb TI |
2106 | if (!err) { |
2107 | struct path path = { | |
2108 | .mnt = fhp->fh_export->ex_path.mnt, | |
2109 | .dentry = fhp->fh_dentry, | |
2110 | }; | |
2111 | if (vfs_statfs(&path, stat)) | |
2112 | err = nfserr_io; | |
2113 | } | |
1da177e4 LT |
2114 | return err; |
2115 | } | |
2116 | ||
c7d51402 | 2117 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
e22841c6 | 2118 | { |
c7d51402 | 2119 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
e22841c6 BF |
2120 | } |
2121 | ||
1da177e4 LT |
2122 | /* |
2123 | * Check for a user's access permissions to this inode. | |
2124 | */ | |
6264d69d | 2125 | __be32 |
0ec757df BF |
2126 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
2127 | struct dentry *dentry, int acc) | |
1da177e4 LT |
2128 | { |
2129 | struct inode *inode = dentry->d_inode; | |
2130 | int err; | |
2131 | ||
aea93397 | 2132 | if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) |
1da177e4 LT |
2133 | return 0; |
2134 | #if 0 | |
2135 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
2136 | acc, | |
8837abca MS |
2137 | (acc & NFSD_MAY_READ)? " read" : "", |
2138 | (acc & NFSD_MAY_WRITE)? " write" : "", | |
2139 | (acc & NFSD_MAY_EXEC)? " exec" : "", | |
2140 | (acc & NFSD_MAY_SATTR)? " sattr" : "", | |
2141 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", | |
2142 | (acc & NFSD_MAY_LOCK)? " lock" : "", | |
2143 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1da177e4 LT |
2144 | inode->i_mode, |
2145 | IS_IMMUTABLE(inode)? " immut" : "", | |
2146 | IS_APPEND(inode)? " append" : "", | |
2c463e95 | 2147 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
1da177e4 | 2148 | dprintk(" owner %d/%d user %d/%d\n", |
5cc0a840 | 2149 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
1da177e4 LT |
2150 | #endif |
2151 | ||
2152 | /* Normally we reject any write/sattr etc access on a read-only file | |
2153 | * system. But if it is IRIX doing check on write-access for a | |
2154 | * device special file, we ignore rofs. | |
2155 | */ | |
8837abca MS |
2156 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
2157 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { | |
2c463e95 DH |
2158 | if (exp_rdonly(rqstp, exp) || |
2159 | __mnt_is_readonly(exp->ex_path.mnt)) | |
1da177e4 | 2160 | return nfserr_rofs; |
8837abca | 2161 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
1da177e4 LT |
2162 | return nfserr_perm; |
2163 | } | |
8837abca | 2164 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
1da177e4 LT |
2165 | return nfserr_perm; |
2166 | ||
8837abca | 2167 | if (acc & NFSD_MAY_LOCK) { |
1da177e4 LT |
2168 | /* If we cannot rely on authentication in NLM requests, |
2169 | * just allow locks, otherwise require read permission, or | |
2170 | * ownership | |
2171 | */ | |
2172 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
2173 | return 0; | |
2174 | else | |
8837abca | 2175 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
1da177e4 LT |
2176 | } |
2177 | /* | |
2178 | * The file owner always gets access permission for accesses that | |
2179 | * would normally be checked at open time. This is to make | |
2180 | * file access work even when the client has done a fchmod(fd, 0). | |
2181 | * | |
2182 | * However, `cp foo bar' should fail nevertheless when bar is | |
2183 | * readonly. A sensible way to do this might be to reject all | |
2184 | * attempts to truncate a read-only file, because a creat() call | |
2185 | * always implies file truncation. | |
2186 | * ... but this isn't really fair. A process may reasonably call | |
2187 | * ftruncate on an open file descriptor on a file with perm 000. | |
2188 | * We must trust the client to do permission checking - using "ACCESS" | |
2189 | * with NFSv3. | |
2190 | */ | |
8837abca | 2191 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
6fab8779 | 2192 | uid_eq(inode->i_uid, current_fsuid())) |
1da177e4 LT |
2193 | return 0; |
2194 | ||
8837abca | 2195 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
f419a2e3 | 2196 | err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); |
1da177e4 LT |
2197 | |
2198 | /* Allow read access to binaries even when mode 111 */ | |
2199 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
a043226b BF |
2200 | (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || |
2201 | acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) | |
f419a2e3 | 2202 | err = inode_permission(inode, MAY_EXEC); |
1da177e4 LT |
2203 | |
2204 | return err? nfserrno(err) : 0; | |
2205 | } | |
2206 | ||
2207 | void | |
2208 | nfsd_racache_shutdown(void) | |
2209 | { | |
54a66e54 JL |
2210 | struct raparms *raparm, *last_raparm; |
2211 | unsigned int i; | |
2212 | ||
1da177e4 | 2213 | dprintk("nfsd: freeing readahead buffers.\n"); |
54a66e54 JL |
2214 | |
2215 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { | |
2216 | raparm = raparm_hash[i].pb_head; | |
2217 | while(raparm) { | |
2218 | last_raparm = raparm; | |
2219 | raparm = raparm->p_next; | |
2220 | kfree(last_raparm); | |
2221 | } | |
2222 | raparm_hash[i].pb_head = NULL; | |
2223 | } | |
1da177e4 LT |
2224 | } |
2225 | /* | |
2226 | * Initialize readahead param cache | |
2227 | */ | |
2228 | int | |
2229 | nfsd_racache_init(int cache_size) | |
2230 | { | |
2231 | int i; | |
fce1456a GB |
2232 | int j = 0; |
2233 | int nperbucket; | |
54a66e54 | 2234 | struct raparms **raparm = NULL; |
1da177e4 | 2235 | |
fce1456a | 2236 | |
54a66e54 | 2237 | if (raparm_hash[0].pb_head) |
1da177e4 | 2238 | return 0; |
54a66e54 JL |
2239 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
2240 | if (nperbucket < 2) | |
2241 | nperbucket = 2; | |
2242 | cache_size = nperbucket * RAPARM_HASH_SIZE; | |
4b3bb06b YB |
2243 | |
2244 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); | |
54a66e54 JL |
2245 | |
2246 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { | |
4b3bb06b | 2247 | spin_lock_init(&raparm_hash[i].pb_lock); |
54a66e54 JL |
2248 | |
2249 | raparm = &raparm_hash[i].pb_head; | |
2250 | for (j = 0; j < nperbucket; j++) { | |
2251 | *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); | |
2252 | if (!*raparm) | |
2253 | goto out_nomem; | |
2254 | raparm = &(*raparm)->p_next; | |
2255 | } | |
2256 | *raparm = NULL; | |
4b3bb06b YB |
2257 | } |
2258 | ||
1da177e4 LT |
2259 | nfsdstats.ra_size = cache_size; |
2260 | return 0; | |
54a66e54 JL |
2261 | |
2262 | out_nomem: | |
2263 | dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); | |
2264 | nfsd_racache_shutdown(); | |
2265 | return -ENOMEM; | |
1da177e4 | 2266 | } |
a257cdd0 AG |
2267 | |
2268 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
2269 | struct posix_acl * | |
2270 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) | |
2271 | { | |
2272 | struct inode *inode = fhp->fh_dentry->d_inode; | |
2273 | char *name; | |
2274 | void *value = NULL; | |
2275 | ssize_t size; | |
2276 | struct posix_acl *acl; | |
2277 | ||
5be196e5 CH |
2278 | if (!IS_POSIXACL(inode)) |
2279 | return ERR_PTR(-EOPNOTSUPP); | |
2280 | ||
2281 | switch (type) { | |
2282 | case ACL_TYPE_ACCESS: | |
2283 | name = POSIX_ACL_XATTR_ACCESS; | |
2284 | break; | |
2285 | case ACL_TYPE_DEFAULT: | |
2286 | name = POSIX_ACL_XATTR_DEFAULT; | |
2287 | break; | |
2288 | default: | |
a257cdd0 | 2289 | return ERR_PTR(-EOPNOTSUPP); |
a257cdd0 AG |
2290 | } |
2291 | ||
5be196e5 CH |
2292 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
2293 | if (size < 0) | |
2294 | return ERR_PTR(size); | |
a257cdd0 | 2295 | |
5f3a4a28 | 2296 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
a257cdd0 AG |
2297 | kfree(value); |
2298 | return acl; | |
2299 | } | |
2300 | ||
2301 | int | |
2302 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) | |
2303 | { | |
2304 | struct inode *inode = fhp->fh_dentry->d_inode; | |
2305 | char *name; | |
2306 | void *value = NULL; | |
2307 | size_t size; | |
2308 | int error; | |
2309 | ||
acfa4380 | 2310 | if (!IS_POSIXACL(inode) || |
a257cdd0 AG |
2311 | !inode->i_op->setxattr || !inode->i_op->removexattr) |
2312 | return -EOPNOTSUPP; | |
2313 | switch(type) { | |
2314 | case ACL_TYPE_ACCESS: | |
334a13ec | 2315 | name = POSIX_ACL_XATTR_ACCESS; |
a257cdd0 AG |
2316 | break; |
2317 | case ACL_TYPE_DEFAULT: | |
334a13ec | 2318 | name = POSIX_ACL_XATTR_DEFAULT; |
a257cdd0 AG |
2319 | break; |
2320 | default: | |
2321 | return -EOPNOTSUPP; | |
2322 | } | |
2323 | ||
2324 | if (acl && acl->a_count) { | |
334a13ec | 2325 | size = posix_acl_xattr_size(acl->a_count); |
a257cdd0 AG |
2326 | value = kmalloc(size, GFP_KERNEL); |
2327 | if (!value) | |
2328 | return -ENOMEM; | |
5f3a4a28 | 2329 | error = posix_acl_to_xattr(&init_user_ns, acl, value, size); |
9ccfc29c | 2330 | if (error < 0) |
a257cdd0 | 2331 | goto getout; |
9ccfc29c | 2332 | size = error; |
a257cdd0 AG |
2333 | } else |
2334 | size = 0; | |
2335 | ||
bad0dcff | 2336 | error = fh_want_write(fhp); |
18f335af DH |
2337 | if (error) |
2338 | goto getout; | |
a257cdd0 | 2339 | if (size) |
5be196e5 | 2340 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
a257cdd0 AG |
2341 | else { |
2342 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) | |
2343 | error = 0; | |
2344 | else { | |
5be196e5 | 2345 | error = vfs_removexattr(fhp->fh_dentry, name); |
a257cdd0 AG |
2346 | if (error == -ENODATA) |
2347 | error = 0; | |
2348 | } | |
2349 | } | |
bad0dcff | 2350 | fh_drop_write(fhp); |
a257cdd0 AG |
2351 | |
2352 | getout: | |
2353 | kfree(value); | |
2354 | return error; | |
2355 | } | |
2356 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |