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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> |
95d871f0 | 19 | #include <linux/falloc.h> |
1da177e4 | 20 | #include <linux/fcntl.h> |
1da177e4 | 21 | #include <linux/namei.h> |
1da177e4 | 22 | #include <linux/delay.h> |
0eeca283 | 23 | #include <linux/fsnotify.h> |
1da177e4 | 24 | #include <linux/posix_acl_xattr.h> |
1da177e4 | 25 | #include <linux/xattr.h> |
9a74af21 BH |
26 | #include <linux/jhash.h> |
27 | #include <linux/ima.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
9a74af21 | 29 | #include <asm/uaccess.h> |
f501912a BM |
30 | #include <linux/exportfs.h> |
31 | #include <linux/writeback.h> | |
18032ca0 | 32 | #include <linux/security.h> |
9a74af21 BH |
33 | |
34 | #ifdef CONFIG_NFSD_V3 | |
35 | #include "xdr3.h" | |
36 | #endif /* CONFIG_NFSD_V3 */ | |
37 | ||
5be196e5 | 38 | #ifdef CONFIG_NFSD_V4 |
ffa0160a | 39 | #include "../internal.h" |
2ca72e17 BF |
40 | #include "acl.h" |
41 | #include "idmap.h" | |
1da177e4 LT |
42 | #endif /* CONFIG_NFSD_V4 */ |
43 | ||
9a74af21 BH |
44 | #include "nfsd.h" |
45 | #include "vfs.h" | |
6e8b50d1 | 46 | #include "trace.h" |
1da177e4 LT |
47 | |
48 | #define NFSDDBG_FACILITY NFSDDBG_FILEOP | |
1da177e4 LT |
49 | |
50 | ||
1da177e4 LT |
51 | /* |
52 | * This is a cache of readahead params that help us choose the proper | |
53 | * readahead strategy. Initially, we set all readahead parameters to 0 | |
54 | * and let the VFS handle things. | |
55 | * If you increase the number of cached files very much, you'll need to | |
56 | * add a hash table here. | |
57 | */ | |
58 | struct raparms { | |
59 | struct raparms *p_next; | |
60 | unsigned int p_count; | |
61 | ino_t p_ino; | |
62 | dev_t p_dev; | |
63 | int p_set; | |
64 | struct file_ra_state p_ra; | |
fce1456a | 65 | unsigned int p_hindex; |
1da177e4 LT |
66 | }; |
67 | ||
fce1456a GB |
68 | struct raparm_hbucket { |
69 | struct raparms *pb_head; | |
70 | spinlock_t pb_lock; | |
71 | } ____cacheline_aligned_in_smp; | |
72 | ||
fce1456a GB |
73 | #define RAPARM_HASH_BITS 4 |
74 | #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) | |
75 | #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) | |
76 | static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; | |
1da177e4 LT |
77 | |
78 | /* | |
79 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed | |
80 | * a mount point. | |
e0bb89ef | 81 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
1da177e4 LT |
82 | * or nfs_ok having possibly changed *dpp and *expp |
83 | */ | |
84 | int | |
85 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, | |
86 | struct svc_export **expp) | |
87 | { | |
88 | struct svc_export *exp = *expp, *exp2 = NULL; | |
89 | struct dentry *dentry = *dpp; | |
91c9fa8f AV |
90 | struct path path = {.mnt = mntget(exp->ex_path.mnt), |
91 | .dentry = dget(dentry)}; | |
6264d69d | 92 | int err = 0; |
1da177e4 | 93 | |
7cc90cc3 | 94 | err = follow_down(&path); |
cc53ce53 DH |
95 | if (err < 0) |
96 | goto out; | |
1da177e4 | 97 | |
91c9fa8f | 98 | exp2 = rqst_exp_get_by_name(rqstp, &path); |
1da177e4 | 99 | if (IS_ERR(exp2)) { |
3b6cee7b BF |
100 | err = PTR_ERR(exp2); |
101 | /* | |
102 | * We normally allow NFS clients to continue | |
103 | * "underneath" a mountpoint that is not exported. | |
104 | * The exception is V4ROOT, where no traversal is ever | |
105 | * allowed without an explicit export of the new | |
106 | * directory. | |
107 | */ | |
108 | if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) | |
109 | err = 0; | |
91c9fa8f | 110 | path_put(&path); |
1da177e4 LT |
111 | goto out; |
112 | } | |
3c394dda SD |
113 | if (nfsd_v4client(rqstp) || |
114 | (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { | |
1da177e4 | 115 | /* successfully crossed mount point */ |
1644ccc8 | 116 | /* |
91c9fa8f AV |
117 | * This is subtle: path.dentry is *not* on path.mnt |
118 | * at this point. The only reason we are safe is that | |
119 | * original mnt is pinned down by exp, so we should | |
120 | * put path *before* putting exp | |
1644ccc8 | 121 | */ |
91c9fa8f AV |
122 | *dpp = path.dentry; |
123 | path.dentry = dentry; | |
1644ccc8 | 124 | *expp = exp2; |
91c9fa8f | 125 | exp2 = exp; |
1da177e4 | 126 | } |
91c9fa8f AV |
127 | path_put(&path); |
128 | exp_put(exp2); | |
1da177e4 LT |
129 | out: |
130 | return err; | |
131 | } | |
132 | ||
289ede45 BF |
133 | static void follow_to_parent(struct path *path) |
134 | { | |
135 | struct dentry *dp; | |
136 | ||
137 | while (path->dentry == path->mnt->mnt_root && follow_up(path)) | |
138 | ; | |
139 | dp = dget_parent(path->dentry); | |
140 | dput(path->dentry); | |
141 | path->dentry = dp; | |
142 | } | |
143 | ||
144 | static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) | |
145 | { | |
146 | struct svc_export *exp2; | |
147 | struct path path = {.mnt = mntget((*exp)->ex_path.mnt), | |
148 | .dentry = dget(dparent)}; | |
149 | ||
150 | follow_to_parent(&path); | |
151 | ||
152 | exp2 = rqst_exp_parent(rqstp, &path); | |
153 | if (PTR_ERR(exp2) == -ENOENT) { | |
154 | *dentryp = dget(dparent); | |
155 | } else if (IS_ERR(exp2)) { | |
156 | path_put(&path); | |
157 | return PTR_ERR(exp2); | |
158 | } else { | |
159 | *dentryp = dget(path.dentry); | |
160 | exp_put(*exp); | |
161 | *exp = exp2; | |
162 | } | |
163 | path_put(&path); | |
164 | return 0; | |
165 | } | |
166 | ||
82ead7fe BF |
167 | /* |
168 | * For nfsd purposes, we treat V4ROOT exports as though there was an | |
169 | * export at *every* directory. | |
170 | */ | |
3227fa41 | 171 | int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) |
82ead7fe BF |
172 | { |
173 | if (d_mountpoint(dentry)) | |
174 | return 1; | |
11fcee02 TM |
175 | if (nfsd4_is_junction(dentry)) |
176 | return 1; | |
82ead7fe BF |
177 | if (!(exp->ex_flags & NFSEXP_V4ROOT)) |
178 | return 0; | |
2b0143b5 | 179 | return d_inode(dentry) != NULL; |
82ead7fe BF |
180 | } |
181 | ||
6264d69d | 182 | __be32 |
6c0a654d | 183 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
5a022fc8 | 184 | const char *name, unsigned int len, |
6c0a654d | 185 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
1da177e4 LT |
186 | { |
187 | struct svc_export *exp; | |
188 | struct dentry *dparent; | |
189 | struct dentry *dentry; | |
6264d69d | 190 | int host_err; |
1da177e4 LT |
191 | |
192 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); | |
193 | ||
1da177e4 | 194 | dparent = fhp->fh_dentry; |
bf18f163 | 195 | exp = exp_get(fhp->fh_export); |
1da177e4 | 196 | |
1da177e4 LT |
197 | /* Lookup the name, but don't follow links */ |
198 | if (isdotent(name, len)) { | |
199 | if (len==1) | |
200 | dentry = dget(dparent); | |
54775491 | 201 | else if (dparent != exp->ex_path.dentry) |
1da177e4 | 202 | dentry = dget_parent(dparent); |
fed83811 | 203 | else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) |
1da177e4 LT |
204 | dentry = dget(dparent); /* .. == . just like at / */ |
205 | else { | |
206 | /* checking mountpoint crossing is very different when stepping up */ | |
289ede45 BF |
207 | host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); |
208 | if (host_err) | |
1da177e4 | 209 | goto out_nfserr; |
1da177e4 LT |
210 | } |
211 | } else { | |
4335723e BF |
212 | /* |
213 | * In the nfsd4_open() case, this may be held across | |
214 | * subsequent open and delegation acquisition which may | |
215 | * need to take the child's i_mutex: | |
216 | */ | |
217 | fh_lock_nested(fhp, I_MUTEX_PARENT); | |
1da177e4 | 218 | dentry = lookup_one_len(name, dparent, len); |
6264d69d | 219 | host_err = PTR_ERR(dentry); |
1da177e4 LT |
220 | if (IS_ERR(dentry)) |
221 | goto out_nfserr; | |
82ead7fe | 222 | if (nfsd_mountpoint(dentry, exp)) { |
bbddca8e N |
223 | /* |
224 | * We don't need the i_mutex after all. It's | |
225 | * still possible we could open this (regular | |
226 | * files can be mountpoints too), but the | |
227 | * i_mutex is just there to prevent renames of | |
228 | * something that we might be about to delegate, | |
229 | * and a mountpoint won't be renamed: | |
230 | */ | |
231 | fh_unlock(fhp); | |
6264d69d | 232 | if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
1da177e4 LT |
233 | dput(dentry); |
234 | goto out_nfserr; | |
235 | } | |
236 | } | |
237 | } | |
6c0a654d BF |
238 | *dentry_ret = dentry; |
239 | *exp_ret = exp; | |
240 | return 0; | |
241 | ||
242 | out_nfserr: | |
243 | exp_put(exp); | |
244 | return nfserrno(host_err); | |
245 | } | |
246 | ||
247 | /* | |
248 | * Look up one component of a pathname. | |
249 | * N.B. After this call _both_ fhp and resfh need an fh_put | |
250 | * | |
251 | * If the lookup would cross a mountpoint, and the mounted filesystem | |
252 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is | |
253 | * accepted as it stands and the mounted directory is | |
254 | * returned. Otherwise the covered directory is returned. | |
255 | * NOTE: this mountpoint crossing is not supported properly by all | |
256 | * clients and is explicitly disallowed for NFSv3 | |
257 | * NeilBrown <neilb@cse.unsw.edu.au> | |
258 | */ | |
259 | __be32 | |
260 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, | |
5a022fc8 | 261 | unsigned int len, struct svc_fh *resfh) |
6c0a654d BF |
262 | { |
263 | struct svc_export *exp; | |
264 | struct dentry *dentry; | |
265 | __be32 err; | |
266 | ||
29a78a3e BF |
267 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
268 | if (err) | |
269 | return err; | |
6c0a654d BF |
270 | err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); |
271 | if (err) | |
272 | return err; | |
32c1eb0c AA |
273 | err = check_nfsd_access(exp, rqstp); |
274 | if (err) | |
275 | goto out; | |
1da177e4 LT |
276 | /* |
277 | * Note: we compose the file handle now, but as the | |
278 | * dentry may be negative, it may need to be updated. | |
279 | */ | |
280 | err = fh_compose(resfh, exp, dentry, fhp); | |
2b0143b5 | 281 | if (!err && d_really_is_negative(dentry)) |
1da177e4 | 282 | err = nfserr_noent; |
32c1eb0c | 283 | out: |
1da177e4 | 284 | dput(dentry); |
1da177e4 LT |
285 | exp_put(exp); |
286 | return err; | |
1da177e4 LT |
287 | } |
288 | ||
f501912a BM |
289 | /* |
290 | * Commit metadata changes to stable storage. | |
291 | */ | |
292 | static int | |
293 | commit_metadata(struct svc_fh *fhp) | |
294 | { | |
2b0143b5 | 295 | struct inode *inode = d_inode(fhp->fh_dentry); |
f501912a | 296 | const struct export_operations *export_ops = inode->i_sb->s_export_op; |
f501912a BM |
297 | |
298 | if (!EX_ISSYNC(fhp->fh_export)) | |
299 | return 0; | |
300 | ||
c3765016 CH |
301 | if (export_ops->commit_metadata) |
302 | return export_ops->commit_metadata(inode); | |
303 | return sync_inode_metadata(inode, 1); | |
f501912a | 304 | } |
6c0a654d | 305 | |
1da177e4 | 306 | /* |
818e5a22 CH |
307 | * Go over the attributes and take care of the small differences between |
308 | * NFS semantics and what Linux expects. | |
1da177e4 | 309 | */ |
818e5a22 CH |
310 | static void |
311 | nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) | |
1da177e4 | 312 | { |
ca456252 | 313 | /* sanitize the mode change */ |
1da177e4 LT |
314 | if (iap->ia_valid & ATTR_MODE) { |
315 | iap->ia_mode &= S_IALLUGO; | |
dee3209d | 316 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
ca456252 JL |
317 | } |
318 | ||
319 | /* Revoke setuid/setgid on chown */ | |
0953e620 | 320 | if (!S_ISDIR(inode->i_mode) && |
c4fa6d7c | 321 | ((iap->ia_valid & ATTR_UID) || (iap->ia_valid & ATTR_GID))) { |
ca456252 JL |
322 | iap->ia_valid |= ATTR_KILL_PRIV; |
323 | if (iap->ia_valid & ATTR_MODE) { | |
324 | /* we're setting mode too, just clear the s*id bits */ | |
8a0ce7d9 | 325 | iap->ia_mode &= ~S_ISUID; |
ca456252 JL |
326 | if (iap->ia_mode & S_IXGRP) |
327 | iap->ia_mode &= ~S_ISGID; | |
328 | } else { | |
329 | /* set ATTR_KILL_* bits and let VFS handle it */ | |
330 | iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); | |
8a0ce7d9 | 331 | } |
1da177e4 | 332 | } |
818e5a22 CH |
333 | } |
334 | ||
335 | static __be32 | |
336 | nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
337 | struct iattr *iap) | |
338 | { | |
2b0143b5 | 339 | struct inode *inode = d_inode(fhp->fh_dentry); |
818e5a22 CH |
340 | int host_err; |
341 | ||
342 | if (iap->ia_size < inode->i_size) { | |
343 | __be32 err; | |
344 | ||
345 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, | |
346 | NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); | |
347 | if (err) | |
348 | return err; | |
349 | } | |
350 | ||
351 | host_err = get_write_access(inode); | |
352 | if (host_err) | |
353 | goto out_nfserrno; | |
354 | ||
355 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); | |
356 | if (host_err) | |
357 | goto out_put_write_access; | |
358 | return 0; | |
359 | ||
360 | out_put_write_access: | |
361 | put_write_access(inode); | |
362 | out_nfserrno: | |
363 | return nfserrno(host_err); | |
364 | } | |
365 | ||
366 | /* | |
367 | * Set various file attributes. After this call fhp needs an fh_put. | |
368 | */ | |
369 | __be32 | |
370 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, | |
371 | int check_guard, time_t guardtime) | |
372 | { | |
373 | struct dentry *dentry; | |
374 | struct inode *inode; | |
375 | int accmode = NFSD_MAY_SATTR; | |
376 | umode_t ftype = 0; | |
377 | __be32 err; | |
378 | int host_err; | |
9f67f189 | 379 | bool get_write_count; |
818e5a22 CH |
380 | int size_change = 0; |
381 | ||
382 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) | |
383 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; | |
384 | if (iap->ia_valid & ATTR_SIZE) | |
385 | ftype = S_IFREG; | |
386 | ||
9f67f189 BF |
387 | /* Callers that do fh_verify should do the fh_want_write: */ |
388 | get_write_count = !fhp->fh_dentry; | |
389 | ||
818e5a22 CH |
390 | /* Get inode */ |
391 | err = fh_verify(rqstp, fhp, ftype, accmode); | |
392 | if (err) | |
393 | goto out; | |
9f67f189 BF |
394 | if (get_write_count) { |
395 | host_err = fh_want_write(fhp); | |
396 | if (host_err) | |
397 | return nfserrno(host_err); | |
398 | } | |
818e5a22 CH |
399 | |
400 | dentry = fhp->fh_dentry; | |
2b0143b5 | 401 | inode = d_inode(dentry); |
818e5a22 CH |
402 | |
403 | /* Ignore any mode updates on symlinks */ | |
404 | if (S_ISLNK(inode->i_mode)) | |
405 | iap->ia_valid &= ~ATTR_MODE; | |
406 | ||
407 | if (!iap->ia_valid) | |
408 | goto out; | |
1da177e4 | 409 | |
818e5a22 CH |
410 | nfsd_sanitize_attrs(inode, iap); |
411 | ||
412 | /* | |
413 | * The size case is special, it changes the file in addition to the | |
414 | * attributes. | |
415 | */ | |
416 | if (iap->ia_valid & ATTR_SIZE) { | |
417 | err = nfsd_get_write_access(rqstp, fhp, iap); | |
418 | if (err) | |
419 | goto out; | |
420 | size_change = 1; | |
f0c63124 CH |
421 | |
422 | /* | |
423 | * RFC5661, Section 18.30.4: | |
424 | * Changing the size of a file with SETATTR indirectly | |
425 | * changes the time_modify and change attributes. | |
426 | * | |
427 | * (and similar for the older RFCs) | |
428 | */ | |
429 | if (iap->ia_size != i_size_read(inode)) | |
430 | iap->ia_valid |= ATTR_MTIME; | |
818e5a22 | 431 | } |
1da177e4 LT |
432 | |
433 | iap->ia_valid |= ATTR_CTIME; | |
434 | ||
987da479 CH |
435 | if (check_guard && guardtime != inode->i_ctime.tv_sec) { |
436 | err = nfserr_notsync; | |
437 | goto out_put_write_access; | |
1da177e4 | 438 | } |
987da479 | 439 | |
987da479 CH |
440 | fh_lock(fhp); |
441 | host_err = notify_change(dentry, iap, NULL); | |
442 | fh_unlock(fhp); | |
1406b916 | 443 | err = nfserrno(host_err); |
987da479 | 444 | |
987da479 | 445 | out_put_write_access: |
1da177e4 LT |
446 | if (size_change) |
447 | put_write_access(inode); | |
448 | if (!err) | |
722b620d | 449 | err = nfserrno(commit_metadata(fhp)); |
1da177e4 LT |
450 | out: |
451 | return err; | |
1da177e4 LT |
452 | } |
453 | ||
5be196e5 | 454 | #if defined(CONFIG_NFSD_V4) |
9b4146e8 CL |
455 | /* |
456 | * NFS junction information is stored in an extended attribute. | |
457 | */ | |
458 | #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" | |
459 | ||
460 | /** | |
461 | * nfsd4_is_junction - Test if an object could be an NFS junction | |
462 | * | |
463 | * @dentry: object to test | |
464 | * | |
465 | * Returns 1 if "dentry" appears to contain NFS junction information. | |
466 | * Otherwise 0 is returned. | |
467 | */ | |
11fcee02 TM |
468 | int nfsd4_is_junction(struct dentry *dentry) |
469 | { | |
2b0143b5 | 470 | struct inode *inode = d_inode(dentry); |
11fcee02 TM |
471 | |
472 | if (inode == NULL) | |
473 | return 0; | |
474 | if (inode->i_mode & S_IXUGO) | |
475 | return 0; | |
476 | if (!(inode->i_mode & S_ISVTX)) | |
477 | return 0; | |
9b4146e8 | 478 | if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) |
11fcee02 TM |
479 | return 0; |
480 | return 1; | |
481 | } | |
18032ca0 DQ |
482 | #ifdef CONFIG_NFSD_V4_SECURITY_LABEL |
483 | __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
484 | struct xdr_netobj *label) | |
485 | { | |
486 | __be32 error; | |
487 | int host_error; | |
488 | struct dentry *dentry; | |
489 | ||
490 | error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); | |
491 | if (error) | |
492 | return error; | |
493 | ||
494 | dentry = fhp->fh_dentry; | |
495 | ||
5955102c | 496 | inode_lock(d_inode(dentry)); |
18032ca0 | 497 | host_error = security_inode_setsecctx(dentry, label->data, label->len); |
5955102c | 498 | inode_unlock(d_inode(dentry)); |
18032ca0 DQ |
499 | return nfserrno(host_error); |
500 | } | |
501 | #else | |
502 | __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
503 | struct xdr_netobj *label) | |
504 | { | |
505 | return nfserr_notsupp; | |
506 | } | |
507 | #endif | |
508 | ||
ffa0160a CH |
509 | __be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst, |
510 | u64 dst_pos, u64 count) | |
511 | { | |
512 | return nfserrno(vfs_clone_file_range(src, src_pos, dst, dst_pos, | |
513 | count)); | |
514 | } | |
515 | ||
95d871f0 AS |
516 | __be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp, |
517 | struct file *file, loff_t offset, loff_t len, | |
518 | int flags) | |
519 | { | |
95d871f0 AS |
520 | int error; |
521 | ||
522 | if (!S_ISREG(file_inode(file)->i_mode)) | |
523 | return nfserr_inval; | |
524 | ||
95d871f0 AS |
525 | error = vfs_fallocate(file, flags, offset, len); |
526 | if (!error) | |
527 | error = commit_metadata(fhp); | |
528 | ||
529 | return nfserrno(error); | |
530 | } | |
6a85d6c7 | 531 | #endif /* defined(CONFIG_NFSD_V4) */ |
1da177e4 LT |
532 | |
533 | #ifdef CONFIG_NFSD_V3 | |
534 | /* | |
535 | * Check server access rights to a file system object | |
536 | */ | |
537 | struct accessmap { | |
538 | u32 access; | |
539 | int how; | |
540 | }; | |
541 | static struct accessmap nfs3_regaccess[] = { | |
8837abca MS |
542 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
543 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
544 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, | |
545 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, | |
1da177e4 LT |
546 | |
547 | { 0, 0 } | |
548 | }; | |
549 | ||
550 | static struct accessmap nfs3_diraccess[] = { | |
8837abca MS |
551 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
552 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, | |
553 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, | |
554 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, | |
555 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, | |
1da177e4 LT |
556 | |
557 | { 0, 0 } | |
558 | }; | |
559 | ||
560 | static struct accessmap nfs3_anyaccess[] = { | |
561 | /* Some clients - Solaris 2.6 at least, make an access call | |
562 | * to the server to check for access for things like /dev/null | |
563 | * (which really, the server doesn't care about). So | |
564 | * We provide simple access checking for them, looking | |
565 | * mainly at mode bits, and we make sure to ignore read-only | |
566 | * filesystem checks | |
567 | */ | |
8837abca MS |
568 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
569 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
570 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
571 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
1da177e4 LT |
572 | |
573 | { 0, 0 } | |
574 | }; | |
575 | ||
6264d69d | 576 | __be32 |
1da177e4 LT |
577 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
578 | { | |
579 | struct accessmap *map; | |
580 | struct svc_export *export; | |
581 | struct dentry *dentry; | |
582 | u32 query, result = 0, sresult = 0; | |
6264d69d | 583 | __be32 error; |
1da177e4 | 584 | |
8837abca | 585 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
586 | if (error) |
587 | goto out; | |
588 | ||
589 | export = fhp->fh_export; | |
590 | dentry = fhp->fh_dentry; | |
591 | ||
e36cb0b8 | 592 | if (d_is_reg(dentry)) |
1da177e4 | 593 | map = nfs3_regaccess; |
e36cb0b8 | 594 | else if (d_is_dir(dentry)) |
1da177e4 LT |
595 | map = nfs3_diraccess; |
596 | else | |
597 | map = nfs3_anyaccess; | |
598 | ||
599 | ||
600 | query = *access; | |
601 | for (; map->access; map++) { | |
602 | if (map->access & query) { | |
6264d69d | 603 | __be32 err2; |
1da177e4 LT |
604 | |
605 | sresult |= map->access; | |
606 | ||
0ec757df | 607 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
1da177e4 LT |
608 | switch (err2) { |
609 | case nfs_ok: | |
610 | result |= map->access; | |
611 | break; | |
612 | ||
613 | /* the following error codes just mean the access was not allowed, | |
614 | * rather than an error occurred */ | |
615 | case nfserr_rofs: | |
616 | case nfserr_acces: | |
617 | case nfserr_perm: | |
618 | /* simply don't "or" in the access bit. */ | |
619 | break; | |
620 | default: | |
621 | error = err2; | |
622 | goto out; | |
623 | } | |
624 | } | |
625 | } | |
626 | *access = result; | |
627 | if (supported) | |
628 | *supported = sresult; | |
629 | ||
630 | out: | |
631 | return error; | |
632 | } | |
633 | #endif /* CONFIG_NFSD_V3 */ | |
634 | ||
105f4622 BF |
635 | static int nfsd_open_break_lease(struct inode *inode, int access) |
636 | { | |
637 | unsigned int mode; | |
1da177e4 | 638 | |
105f4622 BF |
639 | if (access & NFSD_MAY_NOT_BREAK_LEASE) |
640 | return 0; | |
641 | mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; | |
642 | return break_lease(inode, mode | O_NONBLOCK); | |
643 | } | |
1da177e4 LT |
644 | |
645 | /* | |
646 | * Open an existing file or directory. | |
999448a8 BS |
647 | * The may_flags argument indicates the type of open (read/write/lock) |
648 | * and additional flags. | |
1da177e4 LT |
649 | * N.B. After this call fhp needs an fh_put |
650 | */ | |
6264d69d | 651 | __be32 |
175a4eb7 | 652 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, |
999448a8 | 653 | int may_flags, struct file **filp) |
1da177e4 | 654 | { |
765927b2 | 655 | struct path path; |
1da177e4 | 656 | struct inode *inode; |
8519f994 | 657 | struct file *file; |
6264d69d AV |
658 | int flags = O_RDONLY|O_LARGEFILE; |
659 | __be32 err; | |
91885258 | 660 | int host_err = 0; |
1da177e4 | 661 | |
e0e81739 DH |
662 | validate_process_creds(); |
663 | ||
1da177e4 LT |
664 | /* |
665 | * If we get here, then the client has already done an "open", | |
666 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE | |
667 | * in case a chmod has now revoked permission. | |
d91d0b56 BF |
668 | * |
669 | * Arguably we should also allow the owner override for | |
670 | * directories, but we never have and it doesn't seem to have | |
671 | * caused anyone a problem. If we were to change this, note | |
672 | * also that our filldir callbacks would need a variant of | |
673 | * lookup_one_len that doesn't check permissions. | |
1da177e4 | 674 | */ |
d91d0b56 BF |
675 | if (type == S_IFREG) |
676 | may_flags |= NFSD_MAY_OWNER_OVERRIDE; | |
677 | err = fh_verify(rqstp, fhp, type, may_flags); | |
1da177e4 LT |
678 | if (err) |
679 | goto out; | |
680 | ||
765927b2 AV |
681 | path.mnt = fhp->fh_export->ex_path.mnt; |
682 | path.dentry = fhp->fh_dentry; | |
2b0143b5 | 683 | inode = d_inode(path.dentry); |
1da177e4 LT |
684 | |
685 | /* Disallow write access to files with the append-only bit set | |
686 | * or any access when mandatory locking enabled | |
687 | */ | |
688 | err = nfserr_perm; | |
999448a8 | 689 | if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) |
1da177e4 | 690 | goto out; |
5e7fc436 BF |
691 | /* |
692 | * We must ignore files (but only files) which might have mandatory | |
693 | * locks on them because there is no way to know if the accesser has | |
694 | * the lock. | |
695 | */ | |
696 | if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) | |
1da177e4 LT |
697 | goto out; |
698 | ||
699 | if (!inode->i_fop) | |
700 | goto out; | |
701 | ||
999448a8 | 702 | host_err = nfsd_open_break_lease(inode, may_flags); |
6264d69d | 703 | if (host_err) /* NOMEM or WOULDBLOCK */ |
1da177e4 LT |
704 | goto out_nfserr; |
705 | ||
999448a8 BS |
706 | if (may_flags & NFSD_MAY_WRITE) { |
707 | if (may_flags & NFSD_MAY_READ) | |
9ecb6a08 BF |
708 | flags = O_RDWR|O_LARGEFILE; |
709 | else | |
710 | flags = O_WRONLY|O_LARGEFILE; | |
1da177e4 | 711 | } |
999448a8 | 712 | |
8519f994 KM |
713 | file = dentry_open(&path, flags, current_cred()); |
714 | if (IS_ERR(file)) { | |
715 | host_err = PTR_ERR(file); | |
716 | goto out_nfserr; | |
717 | } | |
718 | ||
5e40d331 | 719 | host_err = ima_file_check(file, may_flags, 0); |
8519f994 | 720 | if (host_err) { |
fd891454 | 721 | fput(file); |
8519f994 | 722 | goto out_nfserr; |
06effdbb BS |
723 | } |
724 | ||
8519f994 KM |
725 | if (may_flags & NFSD_MAY_64BIT_COOKIE) |
726 | file->f_mode |= FMODE_64BITHASH; | |
727 | else | |
728 | file->f_mode |= FMODE_32BITHASH; | |
729 | ||
730 | *filp = file; | |
1da177e4 | 731 | out_nfserr: |
6264d69d | 732 | err = nfserrno(host_err); |
1da177e4 | 733 | out: |
e0e81739 | 734 | validate_process_creds(); |
1da177e4 LT |
735 | return err; |
736 | } | |
737 | ||
e749a462 CH |
738 | struct raparms * |
739 | nfsd_init_raparms(struct file *file) | |
1da177e4 | 740 | { |
e749a462 CH |
741 | struct inode *inode = file_inode(file); |
742 | dev_t dev = inode->i_sb->s_dev; | |
743 | ino_t ino = inode->i_ino; | |
1da177e4 LT |
744 | struct raparms *ra, **rap, **frap = NULL; |
745 | int depth = 0; | |
fce1456a GB |
746 | unsigned int hash; |
747 | struct raparm_hbucket *rab; | |
748 | ||
749 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; | |
750 | rab = &raparm_hash[hash]; | |
1da177e4 | 751 | |
fce1456a GB |
752 | spin_lock(&rab->pb_lock); |
753 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { | |
1da177e4 LT |
754 | if (ra->p_ino == ino && ra->p_dev == dev) |
755 | goto found; | |
756 | depth++; | |
757 | if (ra->p_count == 0) | |
758 | frap = rap; | |
759 | } | |
3aa6e0aa | 760 | depth = nfsdstats.ra_size; |
1da177e4 | 761 | if (!frap) { |
fce1456a | 762 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
763 | return NULL; |
764 | } | |
765 | rap = frap; | |
766 | ra = *frap; | |
767 | ra->p_dev = dev; | |
768 | ra->p_ino = ino; | |
769 | ra->p_set = 0; | |
fce1456a | 770 | ra->p_hindex = hash; |
1da177e4 | 771 | found: |
fce1456a | 772 | if (rap != &rab->pb_head) { |
1da177e4 | 773 | *rap = ra->p_next; |
fce1456a GB |
774 | ra->p_next = rab->pb_head; |
775 | rab->pb_head = ra; | |
1da177e4 LT |
776 | } |
777 | ra->p_count++; | |
778 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; | |
fce1456a | 779 | spin_unlock(&rab->pb_lock); |
e749a462 CH |
780 | |
781 | if (ra->p_set) | |
782 | file->f_ra = ra->p_ra; | |
1da177e4 LT |
783 | return ra; |
784 | } | |
785 | ||
e749a462 CH |
786 | void nfsd_put_raparams(struct file *file, struct raparms *ra) |
787 | { | |
788 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; | |
789 | ||
790 | spin_lock(&rab->pb_lock); | |
791 | ra->p_ra = file->f_ra; | |
792 | ra->p_set = 1; | |
793 | ra->p_count--; | |
794 | spin_unlock(&rab->pb_lock); | |
795 | } | |
796 | ||
1da177e4 | 797 | /* |
cf8208d0 JA |
798 | * Grab and keep cached pages associated with a file in the svc_rqst |
799 | * so that they can be passed to the network sendmsg/sendpage routines | |
800 | * directly. They will be released after the sending has completed. | |
1da177e4 LT |
801 | */ |
802 | static int | |
cf8208d0 JA |
803 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
804 | struct splice_desc *sd) | |
1da177e4 | 805 | { |
cf8208d0 | 806 | struct svc_rqst *rqstp = sd->u.data; |
afc59400 | 807 | struct page **pp = rqstp->rq_next_page; |
cf8208d0 JA |
808 | struct page *page = buf->page; |
809 | size_t size; | |
cf8208d0 JA |
810 | |
811 | size = sd->len; | |
1da177e4 LT |
812 | |
813 | if (rqstp->rq_res.page_len == 0) { | |
814 | get_page(page); | |
afc59400 BF |
815 | put_page(*rqstp->rq_next_page); |
816 | *(rqstp->rq_next_page++) = page; | |
cf8208d0 | 817 | rqstp->rq_res.page_base = buf->offset; |
1da177e4 | 818 | rqstp->rq_res.page_len = size; |
44524359 | 819 | } else if (page != pp[-1]) { |
1da177e4 | 820 | get_page(page); |
afc59400 BF |
821 | if (*rqstp->rq_next_page) |
822 | put_page(*rqstp->rq_next_page); | |
823 | *(rqstp->rq_next_page++) = page; | |
1da177e4 | 824 | rqstp->rq_res.page_len += size; |
44524359 | 825 | } else |
1da177e4 | 826 | rqstp->rq_res.page_len += size; |
1da177e4 | 827 | |
1da177e4 LT |
828 | return size; |
829 | } | |
830 | ||
cf8208d0 JA |
831 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
832 | struct splice_desc *sd) | |
833 | { | |
834 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
835 | } | |
836 | ||
e2afc819 JL |
837 | static __be32 |
838 | nfsd_finish_read(struct file *file, unsigned long *count, int host_err) | |
1da177e4 | 839 | { |
6264d69d AV |
840 | if (host_err >= 0) { |
841 | nfsdstats.io_read += host_err; | |
842 | *count = host_err; | |
2a12a9d7 | 843 | fsnotify_access(file); |
dc97618d | 844 | return 0; |
1da177e4 | 845 | } else |
dc97618d BF |
846 | return nfserrno(host_err); |
847 | } | |
848 | ||
e2afc819 | 849 | __be32 nfsd_splice_read(struct svc_rqst *rqstp, |
dc97618d BF |
850 | struct file *file, loff_t offset, unsigned long *count) |
851 | { | |
852 | struct splice_desc sd = { | |
853 | .len = 0, | |
854 | .total_len = *count, | |
855 | .pos = offset, | |
856 | .u.data = rqstp, | |
857 | }; | |
858 | int host_err; | |
859 | ||
860 | rqstp->rq_next_page = rqstp->rq_respages + 1; | |
861 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); | |
862 | return nfsd_finish_read(file, count, host_err); | |
863 | } | |
864 | ||
e2afc819 | 865 | __be32 nfsd_readv(struct file *file, loff_t offset, struct kvec *vec, int vlen, |
dc97618d BF |
866 | unsigned long *count) |
867 | { | |
868 | mm_segment_t oldfs; | |
869 | int host_err; | |
870 | ||
871 | oldfs = get_fs(); | |
872 | set_fs(KERNEL_DS); | |
793b80ef | 873 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset, 0); |
dc97618d BF |
874 | set_fs(oldfs); |
875 | return nfsd_finish_read(file, count, host_err); | |
876 | } | |
877 | ||
878 | static __be32 | |
879 | nfsd_vfs_read(struct svc_rqst *rqstp, struct file *file, | |
880 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) | |
881 | { | |
779fb0f3 | 882 | if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags)) |
dc97618d BF |
883 | return nfsd_splice_read(rqstp, file, offset, count); |
884 | else | |
885 | return nfsd_readv(file, offset, vec, vlen, count); | |
1da177e4 LT |
886 | } |
887 | ||
d911df7b BF |
888 | /* |
889 | * Gathered writes: If another process is currently writing to the file, | |
890 | * there's a high chance this is another nfsd (triggered by a bulk write | |
891 | * from a client's biod). Rather than syncing the file with each write | |
892 | * request, we sleep for 10 msec. | |
893 | * | |
894 | * I don't know if this roughly approximates C. Juszak's idea of | |
895 | * gathered writes, but it's a nice and simple solution (IMHO), and it | |
896 | * seems to work:-) | |
897 | * | |
898 | * Note: we do this only in the NFSv2 case, since v3 and higher have a | |
899 | * better tool (separate unstable writes and commits) for solving this | |
900 | * problem. | |
901 | */ | |
902 | static int wait_for_concurrent_writes(struct file *file) | |
903 | { | |
496ad9aa | 904 | struct inode *inode = file_inode(file); |
d911df7b BF |
905 | static ino_t last_ino; |
906 | static dev_t last_dev; | |
907 | int err = 0; | |
908 | ||
909 | if (atomic_read(&inode->i_writecount) > 1 | |
910 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
911 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); | |
912 | msleep(10); | |
913 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); | |
914 | } | |
915 | ||
916 | if (inode->i_state & I_DIRTY) { | |
917 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); | |
8018ab05 | 918 | err = vfs_fsync(file, 0); |
d911df7b BF |
919 | } |
920 | last_ino = inode->i_ino; | |
921 | last_dev = inode->i_sb->s_dev; | |
922 | return err; | |
923 | } | |
924 | ||
af90f707 | 925 | __be32 |
1da177e4 LT |
926 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
927 | loff_t offset, struct kvec *vec, int vlen, | |
31dec253 | 928 | unsigned long *cnt, int *stablep) |
1da177e4 LT |
929 | { |
930 | struct svc_export *exp; | |
1da177e4 LT |
931 | struct inode *inode; |
932 | mm_segment_t oldfs; | |
6264d69d AV |
933 | __be32 err = 0; |
934 | int host_err; | |
1da177e4 | 935 | int stable = *stablep; |
48e03bc5 | 936 | int use_wgather; |
e49dbbf3 | 937 | loff_t pos = offset; |
8658452e | 938 | unsigned int pflags = current->flags; |
24368aad | 939 | int flags = 0; |
8658452e | 940 | |
7501cc2b | 941 | if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) |
8658452e N |
942 | /* |
943 | * We want less throttling in balance_dirty_pages() | |
944 | * and shrink_inactive_list() so that nfs to | |
945 | * localhost doesn't cause nfsd to lock up due to all | |
946 | * the client's dirty pages or its congested queue. | |
947 | */ | |
948 | current->flags |= PF_LESS_THROTTLE; | |
1da177e4 | 949 | |
6f4e0d5a | 950 | inode = file_inode(file); |
1da177e4 LT |
951 | exp = fhp->fh_export; |
952 | ||
48e03bc5 | 953 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
1da177e4 | 954 | |
1da177e4 LT |
955 | if (!EX_ISSYNC(exp)) |
956 | stable = 0; | |
1da177e4 | 957 | |
24368aad CH |
958 | if (stable && !use_wgather) |
959 | flags |= RWF_SYNC; | |
960 | ||
1da177e4 LT |
961 | /* Write the data. */ |
962 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
24368aad | 963 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos, flags); |
1da177e4 | 964 | set_fs(oldfs); |
e4636d53 BF |
965 | if (host_err < 0) |
966 | goto out_nfserr; | |
967 | *cnt = host_err; | |
968 | nfsdstats.io_write += host_err; | |
2a12a9d7 | 969 | fsnotify_modify(file); |
1da177e4 | 970 | |
24368aad CH |
971 | if (stable && use_wgather) |
972 | host_err = wait_for_concurrent_writes(file); | |
1da177e4 | 973 | |
e4636d53 | 974 | out_nfserr: |
6264d69d | 975 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
a0d24b29 | 976 | if (host_err >= 0) |
1da177e4 | 977 | err = 0; |
a0d24b29 | 978 | else |
6264d69d | 979 | err = nfserrno(host_err); |
7501cc2b | 980 | if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) |
8658452e | 981 | tsk_restore_flags(current, pflags, PF_LESS_THROTTLE); |
1da177e4 LT |
982 | return err; |
983 | } | |
984 | ||
dc97618d BF |
985 | /* |
986 | * Read data from a file. count must contain the requested read count | |
987 | * on entry. On return, *count contains the number of bytes actually read. | |
988 | * N.B. After this call fhp needs an fh_put | |
989 | */ | |
990 | __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
991 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) | |
992 | { | |
993 | struct file *file; | |
994 | struct raparms *ra; | |
995 | __be32 err; | |
996 | ||
6e8b50d1 | 997 | trace_read_start(rqstp, fhp, offset, vlen); |
e749a462 | 998 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); |
dc97618d BF |
999 | if (err) |
1000 | return err; | |
1001 | ||
e749a462 | 1002 | ra = nfsd_init_raparms(file); |
6e8b50d1 JL |
1003 | |
1004 | trace_read_opened(rqstp, fhp, offset, vlen); | |
dc97618d | 1005 | err = nfsd_vfs_read(rqstp, file, offset, vec, vlen, count); |
6e8b50d1 JL |
1006 | trace_read_io_done(rqstp, fhp, offset, vlen); |
1007 | ||
e749a462 CH |
1008 | if (ra) |
1009 | nfsd_put_raparams(file, ra); | |
1010 | fput(file); | |
dc97618d | 1011 | |
6e8b50d1 JL |
1012 | trace_read_done(rqstp, fhp, offset, vlen); |
1013 | ||
fa0a2126 BF |
1014 | return err; |
1015 | } | |
1016 | ||
1da177e4 LT |
1017 | /* |
1018 | * Write data to a file. | |
1019 | * The stable flag requests synchronous writes. | |
1020 | * N.B. After this call fhp needs an fh_put | |
1021 | */ | |
6264d69d | 1022 | __be32 |
1da177e4 | 1023 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
31dec253 | 1024 | loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, |
1da177e4 LT |
1025 | int *stablep) |
1026 | { | |
6264d69d | 1027 | __be32 err = 0; |
1da177e4 | 1028 | |
6e8b50d1 JL |
1029 | trace_write_start(rqstp, fhp, offset, vlen); |
1030 | ||
1da177e4 | 1031 | if (file) { |
0ec757df | 1032 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
8837abca | 1033 | NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); |
1da177e4 LT |
1034 | if (err) |
1035 | goto out; | |
6e8b50d1 | 1036 | trace_write_opened(rqstp, fhp, offset, vlen); |
1da177e4 LT |
1037 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, |
1038 | stablep); | |
6e8b50d1 | 1039 | trace_write_io_done(rqstp, fhp, offset, vlen); |
1da177e4 | 1040 | } else { |
8837abca | 1041 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
1da177e4 LT |
1042 | if (err) |
1043 | goto out; | |
1044 | ||
6e8b50d1 | 1045 | trace_write_opened(rqstp, fhp, offset, vlen); |
1da177e4 LT |
1046 | if (cnt) |
1047 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, | |
1048 | cnt, stablep); | |
6e8b50d1 | 1049 | trace_write_io_done(rqstp, fhp, offset, vlen); |
fd891454 | 1050 | fput(file); |
1da177e4 LT |
1051 | } |
1052 | out: | |
6e8b50d1 | 1053 | trace_write_done(rqstp, fhp, offset, vlen); |
1da177e4 LT |
1054 | return err; |
1055 | } | |
1056 | ||
1057 | #ifdef CONFIG_NFSD_V3 | |
1058 | /* | |
1059 | * Commit all pending writes to stable storage. | |
aa696a6f TM |
1060 | * |
1061 | * Note: we only guarantee that data that lies within the range specified | |
1062 | * by the 'offset' and 'count' parameters will be synced. | |
1da177e4 LT |
1063 | * |
1064 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1065 | * data to the client, as locking happens lower down in the filesystem. | |
1066 | */ | |
6264d69d | 1067 | __be32 |
1da177e4 LT |
1068 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1069 | loff_t offset, unsigned long count) | |
1070 | { | |
1071 | struct file *file; | |
aa696a6f TM |
1072 | loff_t end = LLONG_MAX; |
1073 | __be32 err = nfserr_inval; | |
1da177e4 | 1074 | |
aa696a6f TM |
1075 | if (offset < 0) |
1076 | goto out; | |
1077 | if (count != 0) { | |
1078 | end = offset + (loff_t)count - 1; | |
1079 | if (end < offset) | |
1080 | goto out; | |
1081 | } | |
1da177e4 | 1082 | |
91885258 JL |
1083 | err = nfsd_open(rqstp, fhp, S_IFREG, |
1084 | NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); | |
8837abca | 1085 | if (err) |
aa696a6f | 1086 | goto out; |
1da177e4 | 1087 | if (EX_ISSYNC(fhp->fh_export)) { |
8018ab05 | 1088 | int err2 = vfs_fsync_range(file, offset, end, 0); |
aa696a6f TM |
1089 | |
1090 | if (err2 != -EINVAL) | |
1091 | err = nfserrno(err2); | |
1092 | else | |
1da177e4 | 1093 | err = nfserr_notsupp; |
1da177e4 LT |
1094 | } |
1095 | ||
fd891454 | 1096 | fput(file); |
aa696a6f | 1097 | out: |
1da177e4 LT |
1098 | return err; |
1099 | } | |
1100 | #endif /* CONFIG_NFSD_V3 */ | |
1101 | ||
f2b0dee2 | 1102 | static __be32 |
5c002b3b BF |
1103 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, |
1104 | struct iattr *iap) | |
1105 | { | |
1106 | /* | |
1107 | * Mode has already been set earlier in create: | |
1108 | */ | |
1109 | iap->ia_valid &= ~ATTR_MODE; | |
1110 | /* | |
1111 | * Setting uid/gid works only for root. Irix appears to | |
1112 | * send along the gid on create when it tries to implement | |
1113 | * setgid directories via NFS: | |
1114 | */ | |
6fab8779 | 1115 | if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) |
5c002b3b BF |
1116 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
1117 | if (iap->ia_valid) | |
1118 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); | |
0f3a24b4 | 1119 | /* Callers expect file metadata to be committed here */ |
722b620d | 1120 | return nfserrno(commit_metadata(resfhp)); |
5c002b3b BF |
1121 | } |
1122 | ||
4ac35c2f | 1123 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
1124 | * setting size to 0 may fail for some specific file systems by the permission | |
1125 | * checking which requires WRITE permission but the mode is 000. | |
1126 | * we ignore the resizing(to 0) on the just new created file, since the size is | |
1127 | * 0 after file created. | |
1128 | * | |
1129 | * call this only after vfs_create() is called. | |
1130 | * */ | |
1131 | static void | |
1132 | nfsd_check_ignore_resizing(struct iattr *iap) | |
1133 | { | |
1134 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) | |
1135 | iap->ia_valid &= ~ATTR_SIZE; | |
1136 | } | |
1137 | ||
b44061d0 | 1138 | /* The parent directory should already be locked: */ |
6264d69d | 1139 | __be32 |
b44061d0 | 1140 | nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1da177e4 LT |
1141 | char *fname, int flen, struct iattr *iap, |
1142 | int type, dev_t rdev, struct svc_fh *resfhp) | |
1143 | { | |
2b118859 | 1144 | struct dentry *dentry, *dchild; |
1da177e4 | 1145 | struct inode *dirp; |
6264d69d | 1146 | __be32 err; |
5c002b3b | 1147 | __be32 err2; |
6264d69d | 1148 | int host_err; |
1da177e4 | 1149 | |
1da177e4 | 1150 | dentry = fhp->fh_dentry; |
2b0143b5 | 1151 | dirp = d_inode(dentry); |
1da177e4 | 1152 | |
b44061d0 BF |
1153 | dchild = dget(resfhp->fh_dentry); |
1154 | if (!fhp->fh_locked) { | |
1155 | WARN_ONCE(1, "nfsd_create: parent %pd2 not locked!\n", | |
a6a9f18f | 1156 | dentry); |
b44061d0 BF |
1157 | err = nfserr_io; |
1158 | goto out; | |
1da177e4 | 1159 | } |
1da177e4 | 1160 | |
7eed34f1 OD |
1161 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE); |
1162 | if (err) | |
1163 | goto out; | |
1164 | ||
1da177e4 LT |
1165 | if (!(iap->ia_valid & ATTR_MODE)) |
1166 | iap->ia_mode = 0; | |
1167 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1168 | ||
088406bc | 1169 | err = 0; |
4a55c101 | 1170 | host_err = 0; |
1da177e4 LT |
1171 | switch (type) { |
1172 | case S_IFREG: | |
312b63fb | 1173 | host_err = vfs_create(dirp, dchild, iap->ia_mode, true); |
4ac35c2f | 1174 | if (!host_err) |
1175 | nfsd_check_ignore_resizing(iap); | |
1da177e4 LT |
1176 | break; |
1177 | case S_IFDIR: | |
6264d69d | 1178 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
1da177e4 LT |
1179 | break; |
1180 | case S_IFCHR: | |
1181 | case S_IFBLK: | |
1182 | case S_IFIFO: | |
1183 | case S_IFSOCK: | |
6264d69d | 1184 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
1da177e4 | 1185 | break; |
71423274 BF |
1186 | default: |
1187 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", | |
1188 | type); | |
1189 | host_err = -EINVAL; | |
1da177e4 | 1190 | } |
4a55c101 | 1191 | if (host_err < 0) |
1da177e4 LT |
1192 | goto out_nfserr; |
1193 | ||
f501912a | 1194 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
1da177e4 | 1195 | |
f501912a | 1196 | /* |
0f3a24b4 TM |
1197 | * nfsd_create_setattr already committed the child. Transactional |
1198 | * filesystems had a chance to commit changes for both parent and | |
b44061d0 | 1199 | * child simultaneously making the following commit_metadata a |
0f3a24b4 | 1200 | * noop. |
f501912a BM |
1201 | */ |
1202 | err2 = nfserrno(commit_metadata(fhp)); | |
5c002b3b BF |
1203 | if (err2) |
1204 | err = err2; | |
1da177e4 LT |
1205 | /* |
1206 | * Update the file handle to get the new inode info. | |
1207 | */ | |
1208 | if (!err) | |
1209 | err = fh_update(resfhp); | |
1210 | out: | |
2b118859 | 1211 | dput(dchild); |
1da177e4 LT |
1212 | return err; |
1213 | ||
1214 | out_nfserr: | |
6264d69d | 1215 | err = nfserrno(host_err); |
1da177e4 LT |
1216 | goto out; |
1217 | } | |
1218 | ||
b44061d0 BF |
1219 | /* |
1220 | * Create a filesystem object (regular, directory, special). | |
1221 | * Note that the parent directory is left locked. | |
1222 | * | |
1223 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1224 | */ | |
1225 | __be32 | |
1226 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
1227 | char *fname, int flen, struct iattr *iap, | |
1228 | int type, dev_t rdev, struct svc_fh *resfhp) | |
1229 | { | |
1230 | struct dentry *dentry, *dchild = NULL; | |
1231 | struct inode *dirp; | |
1232 | __be32 err; | |
1233 | int host_err; | |
1234 | ||
1235 | if (isdotent(fname, flen)) | |
1236 | return nfserr_exist; | |
1237 | ||
fa08139d | 1238 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP); |
b44061d0 BF |
1239 | if (err) |
1240 | return err; | |
1241 | ||
1242 | dentry = fhp->fh_dentry; | |
1243 | dirp = d_inode(dentry); | |
1244 | ||
1245 | host_err = fh_want_write(fhp); | |
1246 | if (host_err) | |
1247 | return nfserrno(host_err); | |
1248 | ||
1249 | fh_lock_nested(fhp, I_MUTEX_PARENT); | |
1250 | dchild = lookup_one_len(fname, dentry, flen); | |
1251 | host_err = PTR_ERR(dchild); | |
1252 | if (IS_ERR(dchild)) | |
1253 | return nfserrno(host_err); | |
1254 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
502aa0a5 JB |
1255 | /* |
1256 | * We unconditionally drop our ref to dchild as fh_compose will have | |
1257 | * already grabbed its own ref for it. | |
1258 | */ | |
1259 | dput(dchild); | |
1260 | if (err) | |
b44061d0 | 1261 | return err; |
b44061d0 BF |
1262 | return nfsd_create_locked(rqstp, fhp, fname, flen, iap, type, |
1263 | rdev, resfhp); | |
1264 | } | |
1265 | ||
1da177e4 | 1266 | #ifdef CONFIG_NFSD_V3 |
ac6721a1 | 1267 | |
1da177e4 | 1268 | /* |
ac6721a1 | 1269 | * NFSv3 and NFSv4 version of nfsd_create |
1da177e4 | 1270 | */ |
6264d69d | 1271 | __be32 |
ac6721a1 | 1272 | do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1da177e4 LT |
1273 | char *fname, int flen, struct iattr *iap, |
1274 | struct svc_fh *resfhp, int createmode, u32 *verifier, | |
856121b2 | 1275 | bool *truncp, bool *created) |
1da177e4 LT |
1276 | { |
1277 | struct dentry *dentry, *dchild = NULL; | |
1278 | struct inode *dirp; | |
6264d69d AV |
1279 | __be32 err; |
1280 | int host_err; | |
1da177e4 | 1281 | __u32 v_mtime=0, v_atime=0; |
1da177e4 LT |
1282 | |
1283 | err = nfserr_perm; | |
1284 | if (!flen) | |
1285 | goto out; | |
1286 | err = nfserr_exist; | |
1287 | if (isdotent(fname, flen)) | |
1288 | goto out; | |
1289 | if (!(iap->ia_valid & ATTR_MODE)) | |
1290 | iap->ia_mode = 0; | |
1574dff8 | 1291 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
1da177e4 LT |
1292 | if (err) |
1293 | goto out; | |
1294 | ||
1295 | dentry = fhp->fh_dentry; | |
2b0143b5 | 1296 | dirp = d_inode(dentry); |
1da177e4 | 1297 | |
4a55c101 JK |
1298 | host_err = fh_want_write(fhp); |
1299 | if (host_err) | |
1300 | goto out_nfserr; | |
1301 | ||
12fd3520 | 1302 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1303 | |
1304 | /* | |
1305 | * Compose the response file handle. | |
1306 | */ | |
1307 | dchild = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1308 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1309 | if (IS_ERR(dchild)) |
1310 | goto out_nfserr; | |
1311 | ||
1574dff8 | 1312 | /* If file doesn't exist, check for permissions to create one */ |
2b0143b5 | 1313 | if (d_really_is_negative(dchild)) { |
1574dff8 SP |
1314 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1315 | if (err) | |
1316 | goto out; | |
1317 | } | |
1318 | ||
1da177e4 LT |
1319 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
1320 | if (err) | |
1321 | goto out; | |
1322 | ||
ac6721a1 | 1323 | if (nfsd_create_is_exclusive(createmode)) { |
c397852c | 1324 | /* solaris7 gets confused (bugid 4218508) if these have |
749997e5 JL |
1325 | * the high bit set, so just clear the high bits. If this is |
1326 | * ever changed to use different attrs for storing the | |
1327 | * verifier, then do_open_lookup() will also need to be fixed | |
1328 | * accordingly. | |
1da177e4 LT |
1329 | */ |
1330 | v_mtime = verifier[0]&0x7fffffff; | |
1331 | v_atime = verifier[1]&0x7fffffff; | |
1da177e4 LT |
1332 | } |
1333 | ||
2b0143b5 | 1334 | if (d_really_is_positive(dchild)) { |
1da177e4 LT |
1335 | err = 0; |
1336 | ||
1337 | switch (createmode) { | |
1338 | case NFS3_CREATE_UNCHECKED: | |
e36cb0b8 | 1339 | if (! d_is_reg(dchild)) |
9dc4e6c4 | 1340 | goto out; |
1da177e4 LT |
1341 | else if (truncp) { |
1342 | /* in nfsv4, we need to treat this case a little | |
1343 | * differently. we don't want to truncate the | |
1344 | * file now; this would be wrong if the OPEN | |
1345 | * fails for some other reason. furthermore, | |
1346 | * if the size is nonzero, we should ignore it | |
1347 | * according to spec! | |
1348 | */ | |
1349 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; | |
1350 | } | |
1351 | else { | |
1352 | iap->ia_valid &= ATTR_SIZE; | |
1353 | goto set_attr; | |
1354 | } | |
1355 | break; | |
1356 | case NFS3_CREATE_EXCLUSIVE: | |
2b0143b5 DH |
1357 | if ( d_inode(dchild)->i_mtime.tv_sec == v_mtime |
1358 | && d_inode(dchild)->i_atime.tv_sec == v_atime | |
1359 | && d_inode(dchild)->i_size == 0 ) { | |
7007c90f NB |
1360 | if (created) |
1361 | *created = 1; | |
1da177e4 | 1362 | break; |
7007c90f | 1363 | } |
ac6721a1 | 1364 | case NFS4_CREATE_EXCLUSIVE4_1: |
2b0143b5 DH |
1365 | if ( d_inode(dchild)->i_mtime.tv_sec == v_mtime |
1366 | && d_inode(dchild)->i_atime.tv_sec == v_atime | |
1367 | && d_inode(dchild)->i_size == 0 ) { | |
7007c90f NB |
1368 | if (created) |
1369 | *created = 1; | |
ac6721a1 | 1370 | goto set_attr; |
7007c90f | 1371 | } |
1da177e4 LT |
1372 | /* fallthru */ |
1373 | case NFS3_CREATE_GUARDED: | |
1374 | err = nfserr_exist; | |
1375 | } | |
bad0dcff | 1376 | fh_drop_write(fhp); |
1da177e4 LT |
1377 | goto out; |
1378 | } | |
1379 | ||
312b63fb | 1380 | host_err = vfs_create(dirp, dchild, iap->ia_mode, true); |
463c3197 | 1381 | if (host_err < 0) { |
bad0dcff | 1382 | fh_drop_write(fhp); |
1da177e4 | 1383 | goto out_nfserr; |
463c3197 | 1384 | } |
81ac95c5 BF |
1385 | if (created) |
1386 | *created = 1; | |
1da177e4 | 1387 | |
4ac35c2f | 1388 | nfsd_check_ignore_resizing(iap); |
1389 | ||
ac6721a1 | 1390 | if (nfsd_create_is_exclusive(createmode)) { |
c397852c | 1391 | /* Cram the verifier into atime/mtime */ |
1da177e4 | 1392 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
c397852c | 1393 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
1da177e4 LT |
1394 | /* XXX someone who knows this better please fix it for nsec */ |
1395 | iap->ia_mtime.tv_sec = v_mtime; | |
1396 | iap->ia_atime.tv_sec = v_atime; | |
1397 | iap->ia_mtime.tv_nsec = 0; | |
1398 | iap->ia_atime.tv_nsec = 0; | |
1da177e4 LT |
1399 | } |
1400 | ||
1da177e4 | 1401 | set_attr: |
f501912a BM |
1402 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
1403 | ||
1404 | /* | |
0f3a24b4 TM |
1405 | * nfsd_create_setattr already committed the child |
1406 | * (and possibly also the parent). | |
f501912a BM |
1407 | */ |
1408 | if (!err) | |
1409 | err = nfserrno(commit_metadata(fhp)); | |
f193fbab YT |
1410 | |
1411 | /* | |
1412 | * Update the filehandle to get the new inode info. | |
1413 | */ | |
1414 | if (!err) | |
1415 | err = fh_update(resfhp); | |
1da177e4 LT |
1416 | |
1417 | out: | |
1418 | fh_unlock(fhp); | |
1419 | if (dchild && !IS_ERR(dchild)) | |
1420 | dput(dchild); | |
4a55c101 | 1421 | fh_drop_write(fhp); |
1da177e4 LT |
1422 | return err; |
1423 | ||
1424 | out_nfserr: | |
6264d69d | 1425 | err = nfserrno(host_err); |
1da177e4 LT |
1426 | goto out; |
1427 | } | |
1428 | #endif /* CONFIG_NFSD_V3 */ | |
1429 | ||
1430 | /* | |
1431 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1432 | * fits into the buffer. On return, it contains the true length. | |
1433 | * N.B. After this call fhp needs an fh_put | |
1434 | */ | |
6264d69d | 1435 | __be32 |
1da177e4 LT |
1436 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1437 | { | |
1da177e4 LT |
1438 | struct inode *inode; |
1439 | mm_segment_t oldfs; | |
6264d69d AV |
1440 | __be32 err; |
1441 | int host_err; | |
68ac1234 | 1442 | struct path path; |
1da177e4 | 1443 | |
8837abca | 1444 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
1da177e4 LT |
1445 | if (err) |
1446 | goto out; | |
1447 | ||
68ac1234 AV |
1448 | path.mnt = fhp->fh_export->ex_path.mnt; |
1449 | path.dentry = fhp->fh_dentry; | |
2b0143b5 | 1450 | inode = d_inode(path.dentry); |
1da177e4 LT |
1451 | |
1452 | err = nfserr_inval; | |
acfa4380 | 1453 | if (!inode->i_op->readlink) |
1da177e4 LT |
1454 | goto out; |
1455 | ||
68ac1234 | 1456 | touch_atime(&path); |
1da177e4 LT |
1457 | /* N.B. Why does this call need a get_fs()?? |
1458 | * Remove the set_fs and watch the fireworks:-) --okir | |
1459 | */ | |
1460 | ||
1461 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
fac7a17b | 1462 | host_err = inode->i_op->readlink(path.dentry, (char __user *)buf, *lenp); |
1da177e4 LT |
1463 | set_fs(oldfs); |
1464 | ||
6264d69d | 1465 | if (host_err < 0) |
1da177e4 | 1466 | goto out_nfserr; |
6264d69d | 1467 | *lenp = host_err; |
1da177e4 LT |
1468 | err = 0; |
1469 | out: | |
1470 | return err; | |
1471 | ||
1472 | out_nfserr: | |
6264d69d | 1473 | err = nfserrno(host_err); |
1da177e4 LT |
1474 | goto out; |
1475 | } | |
1476 | ||
1477 | /* | |
1478 | * Create a symlink and look up its inode | |
1479 | * N.B. After this call _both_ fhp and resfhp need an fh_put | |
1480 | */ | |
6264d69d | 1481 | __be32 |
1da177e4 LT |
1482 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1483 | char *fname, int flen, | |
52ee0433 | 1484 | char *path, |
1e444f5b | 1485 | struct svc_fh *resfhp) |
1da177e4 LT |
1486 | { |
1487 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1488 | __be32 err, cerr; |
1489 | int host_err; | |
1da177e4 LT |
1490 | |
1491 | err = nfserr_noent; | |
52ee0433 | 1492 | if (!flen || path[0] == '\0') |
1da177e4 LT |
1493 | goto out; |
1494 | err = nfserr_exist; | |
1495 | if (isdotent(fname, flen)) | |
1496 | goto out; | |
1497 | ||
8837abca | 1498 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1499 | if (err) |
1500 | goto out; | |
4a55c101 JK |
1501 | |
1502 | host_err = fh_want_write(fhp); | |
1503 | if (host_err) | |
1504 | goto out_nfserr; | |
1505 | ||
1da177e4 LT |
1506 | fh_lock(fhp); |
1507 | dentry = fhp->fh_dentry; | |
1508 | dnew = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1509 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1510 | if (IS_ERR(dnew)) |
1511 | goto out_nfserr; | |
1512 | ||
2b0143b5 | 1513 | host_err = vfs_symlink(d_inode(dentry), dnew, path); |
6264d69d | 1514 | err = nfserrno(host_err); |
f501912a BM |
1515 | if (!err) |
1516 | err = nfserrno(commit_metadata(fhp)); | |
1da177e4 LT |
1517 | fh_unlock(fhp); |
1518 | ||
bad0dcff | 1519 | fh_drop_write(fhp); |
75c3f29d | 1520 | |
1da177e4 LT |
1521 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
1522 | dput(dnew); | |
1523 | if (err==0) err = cerr; | |
1524 | out: | |
1525 | return err; | |
1526 | ||
1527 | out_nfserr: | |
6264d69d | 1528 | err = nfserrno(host_err); |
1da177e4 LT |
1529 | goto out; |
1530 | } | |
1531 | ||
1532 | /* | |
1533 | * Create a hardlink | |
1534 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1535 | */ | |
6264d69d | 1536 | __be32 |
1da177e4 LT |
1537 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1538 | char *name, int len, struct svc_fh *tfhp) | |
1539 | { | |
1540 | struct dentry *ddir, *dnew, *dold; | |
55b13354 | 1541 | struct inode *dirp; |
6264d69d AV |
1542 | __be32 err; |
1543 | int host_err; | |
1da177e4 | 1544 | |
8837abca | 1545 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1546 | if (err) |
1547 | goto out; | |
7d818a7b | 1548 | err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
1549 | if (err) |
1550 | goto out; | |
7d818a7b | 1551 | err = nfserr_isdir; |
e36cb0b8 | 1552 | if (d_is_dir(tfhp->fh_dentry)) |
7d818a7b | 1553 | goto out; |
1da177e4 LT |
1554 | err = nfserr_perm; |
1555 | if (!len) | |
1556 | goto out; | |
1557 | err = nfserr_exist; | |
1558 | if (isdotent(name, len)) | |
1559 | goto out; | |
1560 | ||
4a55c101 JK |
1561 | host_err = fh_want_write(tfhp); |
1562 | if (host_err) { | |
1563 | err = nfserrno(host_err); | |
1564 | goto out; | |
1565 | } | |
1566 | ||
12fd3520 | 1567 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
1da177e4 | 1568 | ddir = ffhp->fh_dentry; |
2b0143b5 | 1569 | dirp = d_inode(ddir); |
1da177e4 LT |
1570 | |
1571 | dnew = lookup_one_len(name, ddir, len); | |
6264d69d | 1572 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1573 | if (IS_ERR(dnew)) |
1574 | goto out_nfserr; | |
1575 | ||
1576 | dold = tfhp->fh_dentry; | |
1da177e4 | 1577 | |
4795bb37 | 1578 | err = nfserr_noent; |
2b0143b5 | 1579 | if (d_really_is_negative(dold)) |
4a55c101 | 1580 | goto out_dput; |
146a8595 | 1581 | host_err = vfs_link(dold, dirp, dnew, NULL); |
6264d69d | 1582 | if (!host_err) { |
f501912a BM |
1583 | err = nfserrno(commit_metadata(ffhp)); |
1584 | if (!err) | |
1585 | err = nfserrno(commit_metadata(tfhp)); | |
1da177e4 | 1586 | } else { |
6264d69d | 1587 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1588 | err = nfserr_acces; |
1589 | else | |
6264d69d | 1590 | err = nfserrno(host_err); |
1da177e4 | 1591 | } |
75c3f29d | 1592 | out_dput: |
1da177e4 | 1593 | dput(dnew); |
270d56e5 DR |
1594 | out_unlock: |
1595 | fh_unlock(ffhp); | |
4a55c101 | 1596 | fh_drop_write(tfhp); |
1da177e4 LT |
1597 | out: |
1598 | return err; | |
1599 | ||
1600 | out_nfserr: | |
6264d69d | 1601 | err = nfserrno(host_err); |
270d56e5 | 1602 | goto out_unlock; |
1da177e4 LT |
1603 | } |
1604 | ||
1605 | /* | |
1606 | * Rename a file | |
1607 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1608 | */ | |
6264d69d | 1609 | __be32 |
1da177e4 LT |
1610 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1611 | struct svc_fh *tfhp, char *tname, int tlen) | |
1612 | { | |
1613 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1614 | struct inode *fdir, *tdir; | |
6264d69d AV |
1615 | __be32 err; |
1616 | int host_err; | |
1da177e4 | 1617 | |
8837abca | 1618 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1619 | if (err) |
1620 | goto out; | |
8837abca | 1621 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1622 | if (err) |
1623 | goto out; | |
1624 | ||
1625 | fdentry = ffhp->fh_dentry; | |
2b0143b5 | 1626 | fdir = d_inode(fdentry); |
1da177e4 LT |
1627 | |
1628 | tdentry = tfhp->fh_dentry; | |
2b0143b5 | 1629 | tdir = d_inode(tdentry); |
1da177e4 | 1630 | |
1da177e4 LT |
1631 | err = nfserr_perm; |
1632 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1633 | goto out; | |
1634 | ||
4a55c101 JK |
1635 | host_err = fh_want_write(ffhp); |
1636 | if (host_err) { | |
1637 | err = nfserrno(host_err); | |
1638 | goto out; | |
1639 | } | |
1640 | ||
1da177e4 LT |
1641 | /* cannot use fh_lock as we need deadlock protective ordering |
1642 | * so do it by hand */ | |
1643 | trap = lock_rename(tdentry, fdentry); | |
aaf91ec1 | 1644 | ffhp->fh_locked = tfhp->fh_locked = true; |
1da177e4 LT |
1645 | fill_pre_wcc(ffhp); |
1646 | fill_pre_wcc(tfhp); | |
1647 | ||
1648 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1649 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1650 | if (IS_ERR(odentry)) |
1651 | goto out_nfserr; | |
1652 | ||
6264d69d | 1653 | host_err = -ENOENT; |
2b0143b5 | 1654 | if (d_really_is_negative(odentry)) |
1da177e4 | 1655 | goto out_dput_old; |
6264d69d | 1656 | host_err = -EINVAL; |
1da177e4 LT |
1657 | if (odentry == trap) |
1658 | goto out_dput_old; | |
1659 | ||
1660 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1661 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1662 | if (IS_ERR(ndentry)) |
1663 | goto out_dput_old; | |
6264d69d | 1664 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1665 | if (ndentry == trap) |
1666 | goto out_dput_new; | |
1667 | ||
9079b1eb DH |
1668 | host_err = -EXDEV; |
1669 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) | |
1670 | goto out_dput_new; | |
aa387d6c BF |
1671 | if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) |
1672 | goto out_dput_new; | |
9079b1eb | 1673 | |
520c8b16 | 1674 | host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0); |
f501912a BM |
1675 | if (!host_err) { |
1676 | host_err = commit_metadata(tfhp); | |
6264d69d | 1677 | if (!host_err) |
f501912a | 1678 | host_err = commit_metadata(ffhp); |
1da177e4 | 1679 | } |
1da177e4 LT |
1680 | out_dput_new: |
1681 | dput(ndentry); | |
1682 | out_dput_old: | |
1683 | dput(odentry); | |
1684 | out_nfserr: | |
6264d69d | 1685 | err = nfserrno(host_err); |
fbb74a34 BF |
1686 | /* |
1687 | * We cannot rely on fh_unlock on the two filehandles, | |
1da177e4 | 1688 | * as that would do the wrong thing if the two directories |
fbb74a34 | 1689 | * were the same, so again we do it by hand. |
1da177e4 LT |
1690 | */ |
1691 | fill_post_wcc(ffhp); | |
1692 | fill_post_wcc(tfhp); | |
1693 | unlock_rename(tdentry, fdentry); | |
aaf91ec1 | 1694 | ffhp->fh_locked = tfhp->fh_locked = false; |
4a55c101 | 1695 | fh_drop_write(ffhp); |
1da177e4 LT |
1696 | |
1697 | out: | |
1698 | return err; | |
1699 | } | |
1700 | ||
1701 | /* | |
1702 | * Unlink a file or directory | |
1703 | * N.B. After this call fhp needs an fh_put | |
1704 | */ | |
6264d69d | 1705 | __be32 |
1da177e4 LT |
1706 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1707 | char *fname, int flen) | |
1708 | { | |
1709 | struct dentry *dentry, *rdentry; | |
1710 | struct inode *dirp; | |
6264d69d AV |
1711 | __be32 err; |
1712 | int host_err; | |
1da177e4 LT |
1713 | |
1714 | err = nfserr_acces; | |
1715 | if (!flen || isdotent(fname, flen)) | |
1716 | goto out; | |
8837abca | 1717 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1718 | if (err) |
1719 | goto out; | |
1720 | ||
4a55c101 JK |
1721 | host_err = fh_want_write(fhp); |
1722 | if (host_err) | |
1723 | goto out_nfserr; | |
1724 | ||
12fd3520 | 1725 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 | 1726 | dentry = fhp->fh_dentry; |
2b0143b5 | 1727 | dirp = d_inode(dentry); |
1da177e4 LT |
1728 | |
1729 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1730 | host_err = PTR_ERR(rdentry); |
1da177e4 LT |
1731 | if (IS_ERR(rdentry)) |
1732 | goto out_nfserr; | |
1733 | ||
2b0143b5 | 1734 | if (d_really_is_negative(rdentry)) { |
1da177e4 LT |
1735 | dput(rdentry); |
1736 | err = nfserr_noent; | |
1737 | goto out; | |
1738 | } | |
1739 | ||
1740 | if (!type) | |
2b0143b5 | 1741 | type = d_inode(rdentry)->i_mode & S_IFMT; |
1da177e4 | 1742 | |
9ce137ee | 1743 | if (type != S_IFDIR) |
b21996e3 | 1744 | host_err = vfs_unlink(dirp, rdentry, NULL); |
9ce137ee | 1745 | else |
6264d69d | 1746 | host_err = vfs_rmdir(dirp, rdentry); |
f501912a BM |
1747 | if (!host_err) |
1748 | host_err = commit_metadata(fhp); | |
541ce98c BF |
1749 | dput(rdentry); |
1750 | ||
1da177e4 | 1751 | out_nfserr: |
6264d69d | 1752 | err = nfserrno(host_err); |
f193fbab YT |
1753 | out: |
1754 | return err; | |
1da177e4 LT |
1755 | } |
1756 | ||
14f7dd63 DW |
1757 | /* |
1758 | * We do this buffering because we must not call back into the file | |
1759 | * system's ->lookup() method from the filldir callback. That may well | |
1760 | * deadlock a number of file systems. | |
1761 | * | |
1762 | * This is based heavily on the implementation of same in XFS. | |
1763 | */ | |
1764 | struct buffered_dirent { | |
1765 | u64 ino; | |
1766 | loff_t offset; | |
1767 | int namlen; | |
1768 | unsigned int d_type; | |
1769 | char name[]; | |
1770 | }; | |
1771 | ||
1772 | struct readdir_data { | |
5c0ba4e0 | 1773 | struct dir_context ctx; |
14f7dd63 DW |
1774 | char *dirent; |
1775 | size_t used; | |
53c9c5c0 | 1776 | int full; |
14f7dd63 DW |
1777 | }; |
1778 | ||
ac7576f4 MS |
1779 | static int nfsd_buffered_filldir(struct dir_context *ctx, const char *name, |
1780 | int namlen, loff_t offset, u64 ino, | |
1781 | unsigned int d_type) | |
14f7dd63 | 1782 | { |
ac7576f4 MS |
1783 | struct readdir_data *buf = |
1784 | container_of(ctx, struct readdir_data, ctx); | |
14f7dd63 DW |
1785 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); |
1786 | unsigned int reclen; | |
1787 | ||
1788 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); | |
53c9c5c0 AV |
1789 | if (buf->used + reclen > PAGE_SIZE) { |
1790 | buf->full = 1; | |
14f7dd63 | 1791 | return -EINVAL; |
53c9c5c0 | 1792 | } |
14f7dd63 DW |
1793 | |
1794 | de->namlen = namlen; | |
1795 | de->offset = offset; | |
1796 | de->ino = ino; | |
1797 | de->d_type = d_type; | |
1798 | memcpy(de->name, name, namlen); | |
1799 | buf->used += reclen; | |
1800 | ||
1801 | return 0; | |
1802 | } | |
1803 | ||
ac7576f4 | 1804 | static __be32 nfsd_buffered_readdir(struct file *file, nfsd_filldir_t func, |
2f9092e1 | 1805 | struct readdir_cd *cdp, loff_t *offsetp) |
2628b766 | 1806 | { |
14f7dd63 | 1807 | struct buffered_dirent *de; |
2628b766 | 1808 | int host_err; |
14f7dd63 DW |
1809 | int size; |
1810 | loff_t offset; | |
ac6614b7 AV |
1811 | struct readdir_data buf = { |
1812 | .ctx.actor = nfsd_buffered_filldir, | |
1813 | .dirent = (void *)__get_free_page(GFP_KERNEL) | |
1814 | }; | |
2628b766 | 1815 | |
14f7dd63 | 1816 | if (!buf.dirent) |
2f9092e1 | 1817 | return nfserrno(-ENOMEM); |
14f7dd63 DW |
1818 | |
1819 | offset = *offsetp; | |
2628b766 | 1820 | |
14f7dd63 DW |
1821 | while (1) { |
1822 | unsigned int reclen; | |
1823 | ||
b726e923 | 1824 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
14f7dd63 | 1825 | buf.used = 0; |
53c9c5c0 | 1826 | buf.full = 0; |
14f7dd63 | 1827 | |
5c0ba4e0 | 1828 | host_err = iterate_dir(file, &buf.ctx); |
53c9c5c0 AV |
1829 | if (buf.full) |
1830 | host_err = 0; | |
1831 | ||
1832 | if (host_err < 0) | |
14f7dd63 DW |
1833 | break; |
1834 | ||
1835 | size = buf.used; | |
1836 | ||
1837 | if (!size) | |
1838 | break; | |
1839 | ||
14f7dd63 DW |
1840 | de = (struct buffered_dirent *)buf.dirent; |
1841 | while (size > 0) { | |
1842 | offset = de->offset; | |
1843 | ||
1844 | if (func(cdp, de->name, de->namlen, de->offset, | |
1845 | de->ino, de->d_type)) | |
2f9092e1 | 1846 | break; |
14f7dd63 DW |
1847 | |
1848 | if (cdp->err != nfs_ok) | |
2f9092e1 | 1849 | break; |
14f7dd63 DW |
1850 | |
1851 | reclen = ALIGN(sizeof(*de) + de->namlen, | |
1852 | sizeof(u64)); | |
1853 | size -= reclen; | |
1854 | de = (struct buffered_dirent *)((char *)de + reclen); | |
1855 | } | |
2f9092e1 DW |
1856 | if (size > 0) /* We bailed out early */ |
1857 | break; | |
1858 | ||
c002a6c7 | 1859 | offset = vfs_llseek(file, 0, SEEK_CUR); |
14f7dd63 DW |
1860 | } |
1861 | ||
14f7dd63 | 1862 | free_page((unsigned long)(buf.dirent)); |
2628b766 DW |
1863 | |
1864 | if (host_err) | |
1865 | return nfserrno(host_err); | |
14f7dd63 DW |
1866 | |
1867 | *offsetp = offset; | |
1868 | return cdp->err; | |
2628b766 DW |
1869 | } |
1870 | ||
1da177e4 LT |
1871 | /* |
1872 | * Read entries from a directory. | |
1873 | * The NFSv3/4 verifier we ignore for now. | |
1874 | */ | |
6264d69d | 1875 | __be32 |
1da177e4 | 1876 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
ac7576f4 | 1877 | struct readdir_cd *cdp, nfsd_filldir_t func) |
1da177e4 | 1878 | { |
6264d69d | 1879 | __be32 err; |
1da177e4 LT |
1880 | struct file *file; |
1881 | loff_t offset = *offsetp; | |
06effdbb BS |
1882 | int may_flags = NFSD_MAY_READ; |
1883 | ||
1884 | /* NFSv2 only supports 32 bit cookies */ | |
1885 | if (rqstp->rq_vers > 2) | |
1886 | may_flags |= NFSD_MAY_64BIT_COOKIE; | |
1da177e4 | 1887 | |
06effdbb | 1888 | err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); |
1da177e4 LT |
1889 | if (err) |
1890 | goto out; | |
1891 | ||
b108fe6b | 1892 | offset = vfs_llseek(file, offset, SEEK_SET); |
1da177e4 LT |
1893 | if (offset < 0) { |
1894 | err = nfserrno((int)offset); | |
1895 | goto out_close; | |
1896 | } | |
1897 | ||
14f7dd63 | 1898 | err = nfsd_buffered_readdir(file, func, cdp, offsetp); |
1da177e4 LT |
1899 | |
1900 | if (err == nfserr_eof || err == nfserr_toosmall) | |
1901 | err = nfs_ok; /* can still be found in ->err */ | |
1902 | out_close: | |
fd891454 | 1903 | fput(file); |
1da177e4 LT |
1904 | out: |
1905 | return err; | |
1906 | } | |
1907 | ||
1908 | /* | |
1909 | * Get file system stats | |
1910 | * N.B. After this call fhp needs an fh_put | |
1911 | */ | |
6264d69d | 1912 | __be32 |
04716e66 | 1913 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) |
1da177e4 | 1914 | { |
ebabe9a9 CH |
1915 | __be32 err; |
1916 | ||
1917 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); | |
f6360efb TI |
1918 | if (!err) { |
1919 | struct path path = { | |
1920 | .mnt = fhp->fh_export->ex_path.mnt, | |
1921 | .dentry = fhp->fh_dentry, | |
1922 | }; | |
1923 | if (vfs_statfs(&path, stat)) | |
1924 | err = nfserr_io; | |
1925 | } | |
1da177e4 LT |
1926 | return err; |
1927 | } | |
1928 | ||
c7d51402 | 1929 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
e22841c6 | 1930 | { |
c7d51402 | 1931 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
e22841c6 BF |
1932 | } |
1933 | ||
1da177e4 LT |
1934 | /* |
1935 | * Check for a user's access permissions to this inode. | |
1936 | */ | |
6264d69d | 1937 | __be32 |
0ec757df BF |
1938 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
1939 | struct dentry *dentry, int acc) | |
1da177e4 | 1940 | { |
2b0143b5 | 1941 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
1942 | int err; |
1943 | ||
aea93397 | 1944 | if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) |
1da177e4 LT |
1945 | return 0; |
1946 | #if 0 | |
1947 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
1948 | acc, | |
8837abca MS |
1949 | (acc & NFSD_MAY_READ)? " read" : "", |
1950 | (acc & NFSD_MAY_WRITE)? " write" : "", | |
1951 | (acc & NFSD_MAY_EXEC)? " exec" : "", | |
1952 | (acc & NFSD_MAY_SATTR)? " sattr" : "", | |
1953 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", | |
1954 | (acc & NFSD_MAY_LOCK)? " lock" : "", | |
1955 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1da177e4 LT |
1956 | inode->i_mode, |
1957 | IS_IMMUTABLE(inode)? " immut" : "", | |
1958 | IS_APPEND(inode)? " append" : "", | |
2c463e95 | 1959 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
1da177e4 | 1960 | dprintk(" owner %d/%d user %d/%d\n", |
5cc0a840 | 1961 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
1da177e4 LT |
1962 | #endif |
1963 | ||
1964 | /* Normally we reject any write/sattr etc access on a read-only file | |
1965 | * system. But if it is IRIX doing check on write-access for a | |
1966 | * device special file, we ignore rofs. | |
1967 | */ | |
8837abca MS |
1968 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
1969 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { | |
2c463e95 DH |
1970 | if (exp_rdonly(rqstp, exp) || |
1971 | __mnt_is_readonly(exp->ex_path.mnt)) | |
1da177e4 | 1972 | return nfserr_rofs; |
8837abca | 1973 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
1da177e4 LT |
1974 | return nfserr_perm; |
1975 | } | |
8837abca | 1976 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
1da177e4 LT |
1977 | return nfserr_perm; |
1978 | ||
8837abca | 1979 | if (acc & NFSD_MAY_LOCK) { |
1da177e4 LT |
1980 | /* If we cannot rely on authentication in NLM requests, |
1981 | * just allow locks, otherwise require read permission, or | |
1982 | * ownership | |
1983 | */ | |
1984 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
1985 | return 0; | |
1986 | else | |
8837abca | 1987 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
1da177e4 LT |
1988 | } |
1989 | /* | |
1990 | * The file owner always gets access permission for accesses that | |
1991 | * would normally be checked at open time. This is to make | |
1992 | * file access work even when the client has done a fchmod(fd, 0). | |
1993 | * | |
1994 | * However, `cp foo bar' should fail nevertheless when bar is | |
1995 | * readonly. A sensible way to do this might be to reject all | |
1996 | * attempts to truncate a read-only file, because a creat() call | |
1997 | * always implies file truncation. | |
1998 | * ... but this isn't really fair. A process may reasonably call | |
1999 | * ftruncate on an open file descriptor on a file with perm 000. | |
2000 | * We must trust the client to do permission checking - using "ACCESS" | |
2001 | * with NFSv3. | |
2002 | */ | |
8837abca | 2003 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
6fab8779 | 2004 | uid_eq(inode->i_uid, current_fsuid())) |
1da177e4 LT |
2005 | return 0; |
2006 | ||
8837abca | 2007 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
f419a2e3 | 2008 | err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); |
1da177e4 LT |
2009 | |
2010 | /* Allow read access to binaries even when mode 111 */ | |
2011 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
a043226b BF |
2012 | (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || |
2013 | acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) | |
f419a2e3 | 2014 | err = inode_permission(inode, MAY_EXEC); |
1da177e4 LT |
2015 | |
2016 | return err? nfserrno(err) : 0; | |
2017 | } | |
2018 | ||
2019 | void | |
2020 | nfsd_racache_shutdown(void) | |
2021 | { | |
54a66e54 JL |
2022 | struct raparms *raparm, *last_raparm; |
2023 | unsigned int i; | |
2024 | ||
1da177e4 | 2025 | dprintk("nfsd: freeing readahead buffers.\n"); |
54a66e54 JL |
2026 | |
2027 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { | |
2028 | raparm = raparm_hash[i].pb_head; | |
2029 | while(raparm) { | |
2030 | last_raparm = raparm; | |
2031 | raparm = raparm->p_next; | |
2032 | kfree(last_raparm); | |
2033 | } | |
2034 | raparm_hash[i].pb_head = NULL; | |
2035 | } | |
1da177e4 LT |
2036 | } |
2037 | /* | |
2038 | * Initialize readahead param cache | |
2039 | */ | |
2040 | int | |
2041 | nfsd_racache_init(int cache_size) | |
2042 | { | |
2043 | int i; | |
fce1456a GB |
2044 | int j = 0; |
2045 | int nperbucket; | |
54a66e54 | 2046 | struct raparms **raparm = NULL; |
1da177e4 | 2047 | |
fce1456a | 2048 | |
54a66e54 | 2049 | if (raparm_hash[0].pb_head) |
1da177e4 | 2050 | return 0; |
54a66e54 | 2051 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
3c7aa15d | 2052 | nperbucket = max(2, nperbucket); |
54a66e54 | 2053 | cache_size = nperbucket * RAPARM_HASH_SIZE; |
4b3bb06b YB |
2054 | |
2055 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); | |
54a66e54 JL |
2056 | |
2057 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { | |
4b3bb06b | 2058 | spin_lock_init(&raparm_hash[i].pb_lock); |
54a66e54 JL |
2059 | |
2060 | raparm = &raparm_hash[i].pb_head; | |
2061 | for (j = 0; j < nperbucket; j++) { | |
2062 | *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); | |
2063 | if (!*raparm) | |
2064 | goto out_nomem; | |
2065 | raparm = &(*raparm)->p_next; | |
2066 | } | |
2067 | *raparm = NULL; | |
4b3bb06b YB |
2068 | } |
2069 | ||
1da177e4 LT |
2070 | nfsdstats.ra_size = cache_size; |
2071 | return 0; | |
54a66e54 JL |
2072 | |
2073 | out_nomem: | |
2074 | dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); | |
2075 | nfsd_racache_shutdown(); | |
2076 | return -ENOMEM; | |
1da177e4 | 2077 | } |