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Commit | Line | Data |
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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> |
7c0f6ba6 | 29 | #include <linux/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 | ||
0839ffb8 BF |
335 | static __be32 |
336 | nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
337 | struct iattr *iap) | |
338 | { | |
339 | struct inode *inode = d_inode(fhp->fh_dentry); | |
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 | ||
818e5a22 CH |
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; |
d8d5a74c | 380 | bool size_change = (iap->ia_valid & ATTR_SIZE); |
818e5a22 CH |
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) | |
d8d5a74c | 393 | return err; |
9f67f189 BF |
394 | if (get_write_count) { |
395 | host_err = fh_want_write(fhp); | |
396 | if (host_err) | |
d8d5a74c | 397 | goto out; |
9f67f189 | 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) | |
d8d5a74c | 408 | return 0; |
1da177e4 | 409 | |
818e5a22 CH |
410 | nfsd_sanitize_attrs(inode, iap); |
411 | ||
d8d5a74c CH |
412 | if (check_guard && guardtime != inode->i_ctime.tv_sec) |
413 | return nfserr_notsync; | |
414 | ||
818e5a22 CH |
415 | /* |
416 | * The size case is special, it changes the file in addition to the | |
0839ffb8 | 417 | * attributes. |
818e5a22 | 418 | */ |
d8d5a74c | 419 | if (size_change) { |
0839ffb8 BF |
420 | err = nfsd_get_write_access(rqstp, fhp, iap); |
421 | if (err) | |
d8d5a74c | 422 | return err; |
f0c63124 CH |
423 | |
424 | /* | |
0839ffb8 BF |
425 | * RFC5661, Section 18.30.4: |
426 | * Changing the size of a file with SETATTR indirectly | |
427 | * changes the time_modify and change attributes. | |
428 | * | |
429 | * (and similar for the older RFCs) | |
f0c63124 | 430 | */ |
0839ffb8 BF |
431 | if (iap->ia_size != i_size_read(inode)) |
432 | iap->ia_valid |= ATTR_MTIME; | |
1da177e4 | 433 | } |
987da479 | 434 | |
41f53350 CH |
435 | iap->ia_valid |= ATTR_CTIME; |
436 | ||
987da479 CH |
437 | fh_lock(fhp); |
438 | host_err = notify_change(dentry, iap, NULL); | |
439 | fh_unlock(fhp); | |
440 | ||
0839ffb8 BF |
441 | if (size_change) |
442 | put_write_access(inode); | |
0839ffb8 | 443 | out: |
d8d5a74c CH |
444 | if (!host_err) |
445 | host_err = commit_metadata(fhp); | |
446 | return nfserrno(host_err); | |
1da177e4 LT |
447 | } |
448 | ||
5be196e5 | 449 | #if defined(CONFIG_NFSD_V4) |
9b4146e8 CL |
450 | /* |
451 | * NFS junction information is stored in an extended attribute. | |
452 | */ | |
453 | #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" | |
454 | ||
455 | /** | |
456 | * nfsd4_is_junction - Test if an object could be an NFS junction | |
457 | * | |
458 | * @dentry: object to test | |
459 | * | |
460 | * Returns 1 if "dentry" appears to contain NFS junction information. | |
461 | * Otherwise 0 is returned. | |
462 | */ | |
11fcee02 TM |
463 | int nfsd4_is_junction(struct dentry *dentry) |
464 | { | |
2b0143b5 | 465 | struct inode *inode = d_inode(dentry); |
11fcee02 TM |
466 | |
467 | if (inode == NULL) | |
468 | return 0; | |
469 | if (inode->i_mode & S_IXUGO) | |
470 | return 0; | |
471 | if (!(inode->i_mode & S_ISVTX)) | |
472 | return 0; | |
9b4146e8 | 473 | if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) |
11fcee02 TM |
474 | return 0; |
475 | return 1; | |
476 | } | |
18032ca0 DQ |
477 | #ifdef CONFIG_NFSD_V4_SECURITY_LABEL |
478 | __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
479 | struct xdr_netobj *label) | |
480 | { | |
481 | __be32 error; | |
482 | int host_error; | |
483 | struct dentry *dentry; | |
484 | ||
485 | error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); | |
486 | if (error) | |
487 | return error; | |
488 | ||
489 | dentry = fhp->fh_dentry; | |
490 | ||
5955102c | 491 | inode_lock(d_inode(dentry)); |
18032ca0 | 492 | host_error = security_inode_setsecctx(dentry, label->data, label->len); |
5955102c | 493 | inode_unlock(d_inode(dentry)); |
18032ca0 DQ |
494 | return nfserrno(host_error); |
495 | } | |
496 | #else | |
497 | __be32 nfsd4_set_nfs4_label(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
498 | struct xdr_netobj *label) | |
499 | { | |
500 | return nfserr_notsupp; | |
501 | } | |
502 | #endif | |
503 | ||
ffa0160a CH |
504 | __be32 nfsd4_clone_file_range(struct file *src, u64 src_pos, struct file *dst, |
505 | u64 dst_pos, u64 count) | |
506 | { | |
031a072a | 507 | return nfserrno(do_clone_file_range(src, src_pos, dst, dst_pos, count)); |
ffa0160a CH |
508 | } |
509 | ||
29ae7f9d AS |
510 | ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst, |
511 | u64 dst_pos, u64 count) | |
512 | { | |
513 | ||
514 | /* | |
515 | * Limit copy to 4MB to prevent indefinitely blocking an nfsd | |
516 | * thread and client rpc slot. The choice of 4MB is somewhat | |
517 | * arbitrary. We might instead base this on r/wsize, or make it | |
518 | * tunable, or use a time instead of a byte limit, or implement | |
519 | * asynchronous copy. In theory a client could also recognize a | |
520 | * limit like this and pipeline multiple COPY requests. | |
521 | */ | |
522 | count = min_t(u64, count, 1 << 22); | |
523 | return vfs_copy_file_range(src, src_pos, dst, dst_pos, count, 0); | |
524 | } | |
525 | ||
95d871f0 AS |
526 | __be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp, |
527 | struct file *file, loff_t offset, loff_t len, | |
528 | int flags) | |
529 | { | |
95d871f0 AS |
530 | int error; |
531 | ||
532 | if (!S_ISREG(file_inode(file)->i_mode)) | |
533 | return nfserr_inval; | |
534 | ||
95d871f0 AS |
535 | error = vfs_fallocate(file, flags, offset, len); |
536 | if (!error) | |
537 | error = commit_metadata(fhp); | |
538 | ||
539 | return nfserrno(error); | |
540 | } | |
6a85d6c7 | 541 | #endif /* defined(CONFIG_NFSD_V4) */ |
1da177e4 LT |
542 | |
543 | #ifdef CONFIG_NFSD_V3 | |
544 | /* | |
545 | * Check server access rights to a file system object | |
546 | */ | |
547 | struct accessmap { | |
548 | u32 access; | |
549 | int how; | |
550 | }; | |
551 | static struct accessmap nfs3_regaccess[] = { | |
8837abca MS |
552 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
553 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
554 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, | |
555 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, | |
1da177e4 LT |
556 | |
557 | { 0, 0 } | |
558 | }; | |
559 | ||
560 | static struct accessmap nfs3_diraccess[] = { | |
8837abca MS |
561 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
562 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, | |
563 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, | |
564 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, | |
565 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, | |
1da177e4 LT |
566 | |
567 | { 0, 0 } | |
568 | }; | |
569 | ||
570 | static struct accessmap nfs3_anyaccess[] = { | |
571 | /* Some clients - Solaris 2.6 at least, make an access call | |
572 | * to the server to check for access for things like /dev/null | |
573 | * (which really, the server doesn't care about). So | |
574 | * We provide simple access checking for them, looking | |
575 | * mainly at mode bits, and we make sure to ignore read-only | |
576 | * filesystem checks | |
577 | */ | |
8837abca MS |
578 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
579 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
580 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
581 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
1da177e4 LT |
582 | |
583 | { 0, 0 } | |
584 | }; | |
585 | ||
6264d69d | 586 | __be32 |
1da177e4 LT |
587 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
588 | { | |
589 | struct accessmap *map; | |
590 | struct svc_export *export; | |
591 | struct dentry *dentry; | |
592 | u32 query, result = 0, sresult = 0; | |
6264d69d | 593 | __be32 error; |
1da177e4 | 594 | |
8837abca | 595 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
596 | if (error) |
597 | goto out; | |
598 | ||
599 | export = fhp->fh_export; | |
600 | dentry = fhp->fh_dentry; | |
601 | ||
e36cb0b8 | 602 | if (d_is_reg(dentry)) |
1da177e4 | 603 | map = nfs3_regaccess; |
e36cb0b8 | 604 | else if (d_is_dir(dentry)) |
1da177e4 LT |
605 | map = nfs3_diraccess; |
606 | else | |
607 | map = nfs3_anyaccess; | |
608 | ||
609 | ||
610 | query = *access; | |
611 | for (; map->access; map++) { | |
612 | if (map->access & query) { | |
6264d69d | 613 | __be32 err2; |
1da177e4 LT |
614 | |
615 | sresult |= map->access; | |
616 | ||
0ec757df | 617 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
1da177e4 LT |
618 | switch (err2) { |
619 | case nfs_ok: | |
620 | result |= map->access; | |
621 | break; | |
622 | ||
623 | /* the following error codes just mean the access was not allowed, | |
624 | * rather than an error occurred */ | |
625 | case nfserr_rofs: | |
626 | case nfserr_acces: | |
627 | case nfserr_perm: | |
628 | /* simply don't "or" in the access bit. */ | |
629 | break; | |
630 | default: | |
631 | error = err2; | |
632 | goto out; | |
633 | } | |
634 | } | |
635 | } | |
636 | *access = result; | |
637 | if (supported) | |
638 | *supported = sresult; | |
639 | ||
640 | out: | |
641 | return error; | |
642 | } | |
643 | #endif /* CONFIG_NFSD_V3 */ | |
644 | ||
105f4622 BF |
645 | static int nfsd_open_break_lease(struct inode *inode, int access) |
646 | { | |
647 | unsigned int mode; | |
1da177e4 | 648 | |
105f4622 BF |
649 | if (access & NFSD_MAY_NOT_BREAK_LEASE) |
650 | return 0; | |
651 | mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; | |
652 | return break_lease(inode, mode | O_NONBLOCK); | |
653 | } | |
1da177e4 LT |
654 | |
655 | /* | |
656 | * Open an existing file or directory. | |
999448a8 BS |
657 | * The may_flags argument indicates the type of open (read/write/lock) |
658 | * and additional flags. | |
1da177e4 LT |
659 | * N.B. After this call fhp needs an fh_put |
660 | */ | |
6264d69d | 661 | __be32 |
175a4eb7 | 662 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, |
999448a8 | 663 | int may_flags, struct file **filp) |
1da177e4 | 664 | { |
765927b2 | 665 | struct path path; |
1da177e4 | 666 | struct inode *inode; |
8519f994 | 667 | struct file *file; |
6264d69d AV |
668 | int flags = O_RDONLY|O_LARGEFILE; |
669 | __be32 err; | |
91885258 | 670 | int host_err = 0; |
1da177e4 | 671 | |
e0e81739 DH |
672 | validate_process_creds(); |
673 | ||
1da177e4 LT |
674 | /* |
675 | * If we get here, then the client has already done an "open", | |
676 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE | |
677 | * in case a chmod has now revoked permission. | |
d91d0b56 BF |
678 | * |
679 | * Arguably we should also allow the owner override for | |
680 | * directories, but we never have and it doesn't seem to have | |
681 | * caused anyone a problem. If we were to change this, note | |
682 | * also that our filldir callbacks would need a variant of | |
683 | * lookup_one_len that doesn't check permissions. | |
1da177e4 | 684 | */ |
d91d0b56 BF |
685 | if (type == S_IFREG) |
686 | may_flags |= NFSD_MAY_OWNER_OVERRIDE; | |
687 | err = fh_verify(rqstp, fhp, type, may_flags); | |
1da177e4 LT |
688 | if (err) |
689 | goto out; | |
690 | ||
765927b2 AV |
691 | path.mnt = fhp->fh_export->ex_path.mnt; |
692 | path.dentry = fhp->fh_dentry; | |
2b0143b5 | 693 | inode = d_inode(path.dentry); |
1da177e4 LT |
694 | |
695 | /* Disallow write access to files with the append-only bit set | |
696 | * or any access when mandatory locking enabled | |
697 | */ | |
698 | err = nfserr_perm; | |
999448a8 | 699 | if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) |
1da177e4 | 700 | goto out; |
5e7fc436 BF |
701 | /* |
702 | * We must ignore files (but only files) which might have mandatory | |
703 | * locks on them because there is no way to know if the accesser has | |
704 | * the lock. | |
705 | */ | |
706 | if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) | |
1da177e4 LT |
707 | goto out; |
708 | ||
709 | if (!inode->i_fop) | |
710 | goto out; | |
711 | ||
999448a8 | 712 | host_err = nfsd_open_break_lease(inode, may_flags); |
6264d69d | 713 | if (host_err) /* NOMEM or WOULDBLOCK */ |
1da177e4 LT |
714 | goto out_nfserr; |
715 | ||
999448a8 BS |
716 | if (may_flags & NFSD_MAY_WRITE) { |
717 | if (may_flags & NFSD_MAY_READ) | |
9ecb6a08 BF |
718 | flags = O_RDWR|O_LARGEFILE; |
719 | else | |
720 | flags = O_WRONLY|O_LARGEFILE; | |
1da177e4 | 721 | } |
999448a8 | 722 | |
8519f994 KM |
723 | file = dentry_open(&path, flags, current_cred()); |
724 | if (IS_ERR(file)) { | |
725 | host_err = PTR_ERR(file); | |
726 | goto out_nfserr; | |
727 | } | |
728 | ||
5e40d331 | 729 | host_err = ima_file_check(file, may_flags, 0); |
8519f994 | 730 | if (host_err) { |
fd891454 | 731 | fput(file); |
8519f994 | 732 | goto out_nfserr; |
06effdbb BS |
733 | } |
734 | ||
8519f994 KM |
735 | if (may_flags & NFSD_MAY_64BIT_COOKIE) |
736 | file->f_mode |= FMODE_64BITHASH; | |
737 | else | |
738 | file->f_mode |= FMODE_32BITHASH; | |
739 | ||
740 | *filp = file; | |
1da177e4 | 741 | out_nfserr: |
6264d69d | 742 | err = nfserrno(host_err); |
1da177e4 | 743 | out: |
e0e81739 | 744 | validate_process_creds(); |
1da177e4 LT |
745 | return err; |
746 | } | |
747 | ||
e749a462 CH |
748 | struct raparms * |
749 | nfsd_init_raparms(struct file *file) | |
1da177e4 | 750 | { |
e749a462 CH |
751 | struct inode *inode = file_inode(file); |
752 | dev_t dev = inode->i_sb->s_dev; | |
753 | ino_t ino = inode->i_ino; | |
1da177e4 LT |
754 | struct raparms *ra, **rap, **frap = NULL; |
755 | int depth = 0; | |
fce1456a GB |
756 | unsigned int hash; |
757 | struct raparm_hbucket *rab; | |
758 | ||
759 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; | |
760 | rab = &raparm_hash[hash]; | |
1da177e4 | 761 | |
fce1456a GB |
762 | spin_lock(&rab->pb_lock); |
763 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { | |
1da177e4 LT |
764 | if (ra->p_ino == ino && ra->p_dev == dev) |
765 | goto found; | |
766 | depth++; | |
767 | if (ra->p_count == 0) | |
768 | frap = rap; | |
769 | } | |
3aa6e0aa | 770 | depth = nfsdstats.ra_size; |
1da177e4 | 771 | if (!frap) { |
fce1456a | 772 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
773 | return NULL; |
774 | } | |
775 | rap = frap; | |
776 | ra = *frap; | |
777 | ra->p_dev = dev; | |
778 | ra->p_ino = ino; | |
779 | ra->p_set = 0; | |
fce1456a | 780 | ra->p_hindex = hash; |
1da177e4 | 781 | found: |
fce1456a | 782 | if (rap != &rab->pb_head) { |
1da177e4 | 783 | *rap = ra->p_next; |
fce1456a GB |
784 | ra->p_next = rab->pb_head; |
785 | rab->pb_head = ra; | |
1da177e4 LT |
786 | } |
787 | ra->p_count++; | |
788 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; | |
fce1456a | 789 | spin_unlock(&rab->pb_lock); |
e749a462 CH |
790 | |
791 | if (ra->p_set) | |
792 | file->f_ra = ra->p_ra; | |
1da177e4 LT |
793 | return ra; |
794 | } | |
795 | ||
e749a462 CH |
796 | void nfsd_put_raparams(struct file *file, struct raparms *ra) |
797 | { | |
798 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; | |
799 | ||
800 | spin_lock(&rab->pb_lock); | |
801 | ra->p_ra = file->f_ra; | |
802 | ra->p_set = 1; | |
803 | ra->p_count--; | |
804 | spin_unlock(&rab->pb_lock); | |
805 | } | |
806 | ||
1da177e4 | 807 | /* |
cf8208d0 JA |
808 | * Grab and keep cached pages associated with a file in the svc_rqst |
809 | * so that they can be passed to the network sendmsg/sendpage routines | |
810 | * directly. They will be released after the sending has completed. | |
1da177e4 LT |
811 | */ |
812 | static int | |
cf8208d0 JA |
813 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
814 | struct splice_desc *sd) | |
1da177e4 | 815 | { |
cf8208d0 | 816 | struct svc_rqst *rqstp = sd->u.data; |
afc59400 | 817 | struct page **pp = rqstp->rq_next_page; |
cf8208d0 JA |
818 | struct page *page = buf->page; |
819 | size_t size; | |
cf8208d0 JA |
820 | |
821 | size = sd->len; | |
1da177e4 LT |
822 | |
823 | if (rqstp->rq_res.page_len == 0) { | |
824 | get_page(page); | |
afc59400 BF |
825 | put_page(*rqstp->rq_next_page); |
826 | *(rqstp->rq_next_page++) = page; | |
cf8208d0 | 827 | rqstp->rq_res.page_base = buf->offset; |
1da177e4 | 828 | rqstp->rq_res.page_len = size; |
44524359 | 829 | } else if (page != pp[-1]) { |
1da177e4 | 830 | get_page(page); |
afc59400 BF |
831 | if (*rqstp->rq_next_page) |
832 | put_page(*rqstp->rq_next_page); | |
833 | *(rqstp->rq_next_page++) = page; | |
1da177e4 | 834 | rqstp->rq_res.page_len += size; |
44524359 | 835 | } else |
1da177e4 | 836 | rqstp->rq_res.page_len += size; |
1da177e4 | 837 | |
1da177e4 LT |
838 | return size; |
839 | } | |
840 | ||
cf8208d0 JA |
841 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
842 | struct splice_desc *sd) | |
843 | { | |
844 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
845 | } | |
846 | ||
e2afc819 JL |
847 | static __be32 |
848 | nfsd_finish_read(struct file *file, unsigned long *count, int host_err) | |
1da177e4 | 849 | { |
6264d69d AV |
850 | if (host_err >= 0) { |
851 | nfsdstats.io_read += host_err; | |
852 | *count = host_err; | |
2a12a9d7 | 853 | fsnotify_access(file); |
dc97618d | 854 | return 0; |
1da177e4 | 855 | } else |
dc97618d BF |
856 | return nfserrno(host_err); |
857 | } | |
858 | ||
e2afc819 | 859 | __be32 nfsd_splice_read(struct svc_rqst *rqstp, |
dc97618d BF |
860 | struct file *file, loff_t offset, unsigned long *count) |
861 | { | |
862 | struct splice_desc sd = { | |
863 | .len = 0, | |
864 | .total_len = *count, | |
865 | .pos = offset, | |
866 | .u.data = rqstp, | |
867 | }; | |
868 | int host_err; | |
869 | ||
870 | rqstp->rq_next_page = rqstp->rq_respages + 1; | |
871 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); | |
872 | return nfsd_finish_read(file, count, host_err); | |
873 | } | |
874 | ||
e2afc819 | 875 | __be32 nfsd_readv(struct file *file, loff_t offset, struct kvec *vec, int vlen, |
dc97618d BF |
876 | unsigned long *count) |
877 | { | |
878 | mm_segment_t oldfs; | |
879 | int host_err; | |
880 | ||
881 | oldfs = get_fs(); | |
882 | set_fs(KERNEL_DS); | |
793b80ef | 883 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset, 0); |
dc97618d BF |
884 | set_fs(oldfs); |
885 | return nfsd_finish_read(file, count, host_err); | |
886 | } | |
887 | ||
888 | static __be32 | |
889 | nfsd_vfs_read(struct svc_rqst *rqstp, struct file *file, | |
890 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) | |
891 | { | |
779fb0f3 | 892 | if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags)) |
dc97618d BF |
893 | return nfsd_splice_read(rqstp, file, offset, count); |
894 | else | |
895 | return nfsd_readv(file, offset, vec, vlen, count); | |
1da177e4 LT |
896 | } |
897 | ||
d911df7b BF |
898 | /* |
899 | * Gathered writes: If another process is currently writing to the file, | |
900 | * there's a high chance this is another nfsd (triggered by a bulk write | |
901 | * from a client's biod). Rather than syncing the file with each write | |
902 | * request, we sleep for 10 msec. | |
903 | * | |
904 | * I don't know if this roughly approximates C. Juszak's idea of | |
905 | * gathered writes, but it's a nice and simple solution (IMHO), and it | |
906 | * seems to work:-) | |
907 | * | |
908 | * Note: we do this only in the NFSv2 case, since v3 and higher have a | |
909 | * better tool (separate unstable writes and commits) for solving this | |
910 | * problem. | |
911 | */ | |
912 | static int wait_for_concurrent_writes(struct file *file) | |
913 | { | |
496ad9aa | 914 | struct inode *inode = file_inode(file); |
d911df7b BF |
915 | static ino_t last_ino; |
916 | static dev_t last_dev; | |
917 | int err = 0; | |
918 | ||
919 | if (atomic_read(&inode->i_writecount) > 1 | |
920 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
921 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); | |
922 | msleep(10); | |
923 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); | |
924 | } | |
925 | ||
926 | if (inode->i_state & I_DIRTY) { | |
927 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); | |
8018ab05 | 928 | err = vfs_fsync(file, 0); |
d911df7b BF |
929 | } |
930 | last_ino = inode->i_ino; | |
931 | last_dev = inode->i_sb->s_dev; | |
932 | return err; | |
933 | } | |
934 | ||
af90f707 | 935 | __be32 |
1da177e4 LT |
936 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
937 | loff_t offset, struct kvec *vec, int vlen, | |
31dec253 | 938 | unsigned long *cnt, int *stablep) |
1da177e4 LT |
939 | { |
940 | struct svc_export *exp; | |
1da177e4 LT |
941 | struct inode *inode; |
942 | mm_segment_t oldfs; | |
6264d69d AV |
943 | __be32 err = 0; |
944 | int host_err; | |
1da177e4 | 945 | int stable = *stablep; |
48e03bc5 | 946 | int use_wgather; |
e49dbbf3 | 947 | loff_t pos = offset; |
8658452e | 948 | unsigned int pflags = current->flags; |
24368aad | 949 | int flags = 0; |
8658452e | 950 | |
7501cc2b | 951 | if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) |
8658452e N |
952 | /* |
953 | * We want less throttling in balance_dirty_pages() | |
954 | * and shrink_inactive_list() so that nfs to | |
955 | * localhost doesn't cause nfsd to lock up due to all | |
956 | * the client's dirty pages or its congested queue. | |
957 | */ | |
958 | current->flags |= PF_LESS_THROTTLE; | |
1da177e4 | 959 | |
6f4e0d5a | 960 | inode = file_inode(file); |
1da177e4 LT |
961 | exp = fhp->fh_export; |
962 | ||
48e03bc5 | 963 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
1da177e4 | 964 | |
1da177e4 LT |
965 | if (!EX_ISSYNC(exp)) |
966 | stable = 0; | |
1da177e4 | 967 | |
24368aad CH |
968 | if (stable && !use_wgather) |
969 | flags |= RWF_SYNC; | |
970 | ||
1da177e4 LT |
971 | /* Write the data. */ |
972 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
24368aad | 973 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &pos, flags); |
1da177e4 | 974 | set_fs(oldfs); |
e4636d53 BF |
975 | if (host_err < 0) |
976 | goto out_nfserr; | |
977 | *cnt = host_err; | |
978 | nfsdstats.io_write += host_err; | |
2a12a9d7 | 979 | fsnotify_modify(file); |
1da177e4 | 980 | |
24368aad CH |
981 | if (stable && use_wgather) |
982 | host_err = wait_for_concurrent_writes(file); | |
1da177e4 | 983 | |
e4636d53 | 984 | out_nfserr: |
6264d69d | 985 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
a0d24b29 | 986 | if (host_err >= 0) |
1da177e4 | 987 | err = 0; |
a0d24b29 | 988 | else |
6264d69d | 989 | err = nfserrno(host_err); |
7501cc2b | 990 | if (test_bit(RQ_LOCAL, &rqstp->rq_flags)) |
8658452e | 991 | tsk_restore_flags(current, pflags, PF_LESS_THROTTLE); |
1da177e4 LT |
992 | return err; |
993 | } | |
994 | ||
dc97618d BF |
995 | /* |
996 | * Read data from a file. count must contain the requested read count | |
997 | * on entry. On return, *count contains the number of bytes actually read. | |
998 | * N.B. After this call fhp needs an fh_put | |
999 | */ | |
1000 | __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
1001 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) | |
1002 | { | |
1003 | struct file *file; | |
1004 | struct raparms *ra; | |
1005 | __be32 err; | |
1006 | ||
6e8b50d1 | 1007 | trace_read_start(rqstp, fhp, offset, vlen); |
e749a462 | 1008 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); |
dc97618d BF |
1009 | if (err) |
1010 | return err; | |
1011 | ||
e749a462 | 1012 | ra = nfsd_init_raparms(file); |
6e8b50d1 JL |
1013 | |
1014 | trace_read_opened(rqstp, fhp, offset, vlen); | |
dc97618d | 1015 | err = nfsd_vfs_read(rqstp, file, offset, vec, vlen, count); |
6e8b50d1 JL |
1016 | trace_read_io_done(rqstp, fhp, offset, vlen); |
1017 | ||
e749a462 CH |
1018 | if (ra) |
1019 | nfsd_put_raparams(file, ra); | |
1020 | fput(file); | |
dc97618d | 1021 | |
6e8b50d1 JL |
1022 | trace_read_done(rqstp, fhp, offset, vlen); |
1023 | ||
fa0a2126 BF |
1024 | return err; |
1025 | } | |
1026 | ||
1da177e4 LT |
1027 | /* |
1028 | * Write data to a file. | |
1029 | * The stable flag requests synchronous writes. | |
1030 | * N.B. After this call fhp needs an fh_put | |
1031 | */ | |
6264d69d | 1032 | __be32 |
1da177e4 | 1033 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
31dec253 | 1034 | loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, |
1da177e4 LT |
1035 | int *stablep) |
1036 | { | |
6264d69d | 1037 | __be32 err = 0; |
1da177e4 | 1038 | |
6e8b50d1 JL |
1039 | trace_write_start(rqstp, fhp, offset, vlen); |
1040 | ||
1da177e4 | 1041 | if (file) { |
0ec757df | 1042 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
8837abca | 1043 | NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); |
1da177e4 LT |
1044 | if (err) |
1045 | goto out; | |
6e8b50d1 | 1046 | trace_write_opened(rqstp, fhp, offset, vlen); |
1da177e4 LT |
1047 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, |
1048 | stablep); | |
6e8b50d1 | 1049 | trace_write_io_done(rqstp, fhp, offset, vlen); |
1da177e4 | 1050 | } else { |
8837abca | 1051 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
1da177e4 LT |
1052 | if (err) |
1053 | goto out; | |
1054 | ||
6e8b50d1 | 1055 | trace_write_opened(rqstp, fhp, offset, vlen); |
1da177e4 LT |
1056 | if (cnt) |
1057 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, | |
1058 | cnt, stablep); | |
6e8b50d1 | 1059 | trace_write_io_done(rqstp, fhp, offset, vlen); |
fd891454 | 1060 | fput(file); |
1da177e4 LT |
1061 | } |
1062 | out: | |
6e8b50d1 | 1063 | trace_write_done(rqstp, fhp, offset, vlen); |
1da177e4 LT |
1064 | return err; |
1065 | } | |
1066 | ||
1067 | #ifdef CONFIG_NFSD_V3 | |
1068 | /* | |
1069 | * Commit all pending writes to stable storage. | |
aa696a6f TM |
1070 | * |
1071 | * Note: we only guarantee that data that lies within the range specified | |
1072 | * by the 'offset' and 'count' parameters will be synced. | |
1da177e4 LT |
1073 | * |
1074 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1075 | * data to the client, as locking happens lower down in the filesystem. | |
1076 | */ | |
6264d69d | 1077 | __be32 |
1da177e4 LT |
1078 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1079 | loff_t offset, unsigned long count) | |
1080 | { | |
1081 | struct file *file; | |
aa696a6f TM |
1082 | loff_t end = LLONG_MAX; |
1083 | __be32 err = nfserr_inval; | |
1da177e4 | 1084 | |
aa696a6f TM |
1085 | if (offset < 0) |
1086 | goto out; | |
1087 | if (count != 0) { | |
1088 | end = offset + (loff_t)count - 1; | |
1089 | if (end < offset) | |
1090 | goto out; | |
1091 | } | |
1da177e4 | 1092 | |
91885258 JL |
1093 | err = nfsd_open(rqstp, fhp, S_IFREG, |
1094 | NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); | |
8837abca | 1095 | if (err) |
aa696a6f | 1096 | goto out; |
1da177e4 | 1097 | if (EX_ISSYNC(fhp->fh_export)) { |
8018ab05 | 1098 | int err2 = vfs_fsync_range(file, offset, end, 0); |
aa696a6f TM |
1099 | |
1100 | if (err2 != -EINVAL) | |
1101 | err = nfserrno(err2); | |
1102 | else | |
1da177e4 | 1103 | err = nfserr_notsupp; |
1da177e4 LT |
1104 | } |
1105 | ||
fd891454 | 1106 | fput(file); |
aa696a6f | 1107 | out: |
1da177e4 LT |
1108 | return err; |
1109 | } | |
1110 | #endif /* CONFIG_NFSD_V3 */ | |
1111 | ||
f2b0dee2 | 1112 | static __be32 |
5c002b3b BF |
1113 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, |
1114 | struct iattr *iap) | |
1115 | { | |
1116 | /* | |
1117 | * Mode has already been set earlier in create: | |
1118 | */ | |
1119 | iap->ia_valid &= ~ATTR_MODE; | |
1120 | /* | |
1121 | * Setting uid/gid works only for root. Irix appears to | |
1122 | * send along the gid on create when it tries to implement | |
1123 | * setgid directories via NFS: | |
1124 | */ | |
6fab8779 | 1125 | if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) |
5c002b3b BF |
1126 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
1127 | if (iap->ia_valid) | |
1128 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); | |
0f3a24b4 | 1129 | /* Callers expect file metadata to be committed here */ |
722b620d | 1130 | return nfserrno(commit_metadata(resfhp)); |
5c002b3b BF |
1131 | } |
1132 | ||
4ac35c2f | 1133 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
1134 | * setting size to 0 may fail for some specific file systems by the permission | |
1135 | * checking which requires WRITE permission but the mode is 000. | |
1136 | * we ignore the resizing(to 0) on the just new created file, since the size is | |
1137 | * 0 after file created. | |
1138 | * | |
1139 | * call this only after vfs_create() is called. | |
1140 | * */ | |
1141 | static void | |
1142 | nfsd_check_ignore_resizing(struct iattr *iap) | |
1143 | { | |
1144 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) | |
1145 | iap->ia_valid &= ~ATTR_SIZE; | |
1146 | } | |
1147 | ||
b44061d0 | 1148 | /* The parent directory should already be locked: */ |
6264d69d | 1149 | __be32 |
b44061d0 | 1150 | nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1da177e4 LT |
1151 | char *fname, int flen, struct iattr *iap, |
1152 | int type, dev_t rdev, struct svc_fh *resfhp) | |
1153 | { | |
2b118859 | 1154 | struct dentry *dentry, *dchild; |
1da177e4 | 1155 | struct inode *dirp; |
6264d69d | 1156 | __be32 err; |
5c002b3b | 1157 | __be32 err2; |
6264d69d | 1158 | int host_err; |
1da177e4 | 1159 | |
1da177e4 | 1160 | dentry = fhp->fh_dentry; |
2b0143b5 | 1161 | dirp = d_inode(dentry); |
1da177e4 | 1162 | |
b44061d0 BF |
1163 | dchild = dget(resfhp->fh_dentry); |
1164 | if (!fhp->fh_locked) { | |
1165 | WARN_ONCE(1, "nfsd_create: parent %pd2 not locked!\n", | |
a6a9f18f | 1166 | dentry); |
b44061d0 BF |
1167 | err = nfserr_io; |
1168 | goto out; | |
1da177e4 | 1169 | } |
1da177e4 | 1170 | |
7eed34f1 OD |
1171 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE); |
1172 | if (err) | |
1173 | goto out; | |
1174 | ||
1da177e4 LT |
1175 | if (!(iap->ia_valid & ATTR_MODE)) |
1176 | iap->ia_mode = 0; | |
1177 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1178 | ||
088406bc | 1179 | err = 0; |
4a55c101 | 1180 | host_err = 0; |
1da177e4 LT |
1181 | switch (type) { |
1182 | case S_IFREG: | |
312b63fb | 1183 | host_err = vfs_create(dirp, dchild, iap->ia_mode, true); |
4ac35c2f | 1184 | if (!host_err) |
1185 | nfsd_check_ignore_resizing(iap); | |
1da177e4 LT |
1186 | break; |
1187 | case S_IFDIR: | |
6264d69d | 1188 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
1da177e4 LT |
1189 | break; |
1190 | case S_IFCHR: | |
1191 | case S_IFBLK: | |
1192 | case S_IFIFO: | |
1193 | case S_IFSOCK: | |
6264d69d | 1194 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
1da177e4 | 1195 | break; |
71423274 BF |
1196 | default: |
1197 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", | |
1198 | type); | |
1199 | host_err = -EINVAL; | |
1da177e4 | 1200 | } |
4a55c101 | 1201 | if (host_err < 0) |
1da177e4 LT |
1202 | goto out_nfserr; |
1203 | ||
f501912a | 1204 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
1da177e4 | 1205 | |
f501912a | 1206 | /* |
0f3a24b4 TM |
1207 | * nfsd_create_setattr already committed the child. Transactional |
1208 | * filesystems had a chance to commit changes for both parent and | |
b44061d0 | 1209 | * child simultaneously making the following commit_metadata a |
0f3a24b4 | 1210 | * noop. |
f501912a BM |
1211 | */ |
1212 | err2 = nfserrno(commit_metadata(fhp)); | |
5c002b3b BF |
1213 | if (err2) |
1214 | err = err2; | |
1da177e4 LT |
1215 | /* |
1216 | * Update the file handle to get the new inode info. | |
1217 | */ | |
1218 | if (!err) | |
1219 | err = fh_update(resfhp); | |
1220 | out: | |
2b118859 | 1221 | dput(dchild); |
1da177e4 LT |
1222 | return err; |
1223 | ||
1224 | out_nfserr: | |
6264d69d | 1225 | err = nfserrno(host_err); |
1da177e4 LT |
1226 | goto out; |
1227 | } | |
1228 | ||
b44061d0 BF |
1229 | /* |
1230 | * Create a filesystem object (regular, directory, special). | |
1231 | * Note that the parent directory is left locked. | |
1232 | * | |
1233 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1234 | */ | |
1235 | __be32 | |
1236 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
1237 | char *fname, int flen, struct iattr *iap, | |
1238 | int type, dev_t rdev, struct svc_fh *resfhp) | |
1239 | { | |
1240 | struct dentry *dentry, *dchild = NULL; | |
1241 | struct inode *dirp; | |
1242 | __be32 err; | |
1243 | int host_err; | |
1244 | ||
1245 | if (isdotent(fname, flen)) | |
1246 | return nfserr_exist; | |
1247 | ||
fa08139d | 1248 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP); |
b44061d0 BF |
1249 | if (err) |
1250 | return err; | |
1251 | ||
1252 | dentry = fhp->fh_dentry; | |
1253 | dirp = d_inode(dentry); | |
1254 | ||
1255 | host_err = fh_want_write(fhp); | |
1256 | if (host_err) | |
1257 | return nfserrno(host_err); | |
1258 | ||
1259 | fh_lock_nested(fhp, I_MUTEX_PARENT); | |
1260 | dchild = lookup_one_len(fname, dentry, flen); | |
1261 | host_err = PTR_ERR(dchild); | |
1262 | if (IS_ERR(dchild)) | |
1263 | return nfserrno(host_err); | |
1264 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
502aa0a5 JB |
1265 | /* |
1266 | * We unconditionally drop our ref to dchild as fh_compose will have | |
1267 | * already grabbed its own ref for it. | |
1268 | */ | |
1269 | dput(dchild); | |
1270 | if (err) | |
b44061d0 | 1271 | return err; |
b44061d0 BF |
1272 | return nfsd_create_locked(rqstp, fhp, fname, flen, iap, type, |
1273 | rdev, resfhp); | |
1274 | } | |
1275 | ||
1da177e4 | 1276 | #ifdef CONFIG_NFSD_V3 |
ac6721a1 | 1277 | |
1da177e4 | 1278 | /* |
ac6721a1 | 1279 | * NFSv3 and NFSv4 version of nfsd_create |
1da177e4 | 1280 | */ |
6264d69d | 1281 | __be32 |
ac6721a1 | 1282 | do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1da177e4 LT |
1283 | char *fname, int flen, struct iattr *iap, |
1284 | struct svc_fh *resfhp, int createmode, u32 *verifier, | |
856121b2 | 1285 | bool *truncp, bool *created) |
1da177e4 LT |
1286 | { |
1287 | struct dentry *dentry, *dchild = NULL; | |
1288 | struct inode *dirp; | |
6264d69d AV |
1289 | __be32 err; |
1290 | int host_err; | |
1da177e4 | 1291 | __u32 v_mtime=0, v_atime=0; |
1da177e4 LT |
1292 | |
1293 | err = nfserr_perm; | |
1294 | if (!flen) | |
1295 | goto out; | |
1296 | err = nfserr_exist; | |
1297 | if (isdotent(fname, flen)) | |
1298 | goto out; | |
1299 | if (!(iap->ia_valid & ATTR_MODE)) | |
1300 | iap->ia_mode = 0; | |
1574dff8 | 1301 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
1da177e4 LT |
1302 | if (err) |
1303 | goto out; | |
1304 | ||
1305 | dentry = fhp->fh_dentry; | |
2b0143b5 | 1306 | dirp = d_inode(dentry); |
1da177e4 | 1307 | |
4a55c101 JK |
1308 | host_err = fh_want_write(fhp); |
1309 | if (host_err) | |
1310 | goto out_nfserr; | |
1311 | ||
12fd3520 | 1312 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1313 | |
1314 | /* | |
1315 | * Compose the response file handle. | |
1316 | */ | |
1317 | dchild = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1318 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1319 | if (IS_ERR(dchild)) |
1320 | goto out_nfserr; | |
1321 | ||
1574dff8 | 1322 | /* If file doesn't exist, check for permissions to create one */ |
2b0143b5 | 1323 | if (d_really_is_negative(dchild)) { |
1574dff8 SP |
1324 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1325 | if (err) | |
1326 | goto out; | |
1327 | } | |
1328 | ||
1da177e4 LT |
1329 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
1330 | if (err) | |
1331 | goto out; | |
1332 | ||
ac6721a1 | 1333 | if (nfsd_create_is_exclusive(createmode)) { |
c397852c | 1334 | /* solaris7 gets confused (bugid 4218508) if these have |
749997e5 JL |
1335 | * the high bit set, so just clear the high bits. If this is |
1336 | * ever changed to use different attrs for storing the | |
1337 | * verifier, then do_open_lookup() will also need to be fixed | |
1338 | * accordingly. | |
1da177e4 LT |
1339 | */ |
1340 | v_mtime = verifier[0]&0x7fffffff; | |
1341 | v_atime = verifier[1]&0x7fffffff; | |
1da177e4 LT |
1342 | } |
1343 | ||
2b0143b5 | 1344 | if (d_really_is_positive(dchild)) { |
1da177e4 LT |
1345 | err = 0; |
1346 | ||
1347 | switch (createmode) { | |
1348 | case NFS3_CREATE_UNCHECKED: | |
e36cb0b8 | 1349 | if (! d_is_reg(dchild)) |
9dc4e6c4 | 1350 | goto out; |
1da177e4 LT |
1351 | else if (truncp) { |
1352 | /* in nfsv4, we need to treat this case a little | |
1353 | * differently. we don't want to truncate the | |
1354 | * file now; this would be wrong if the OPEN | |
1355 | * fails for some other reason. furthermore, | |
1356 | * if the size is nonzero, we should ignore it | |
1357 | * according to spec! | |
1358 | */ | |
1359 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; | |
1360 | } | |
1361 | else { | |
1362 | iap->ia_valid &= ATTR_SIZE; | |
1363 | goto set_attr; | |
1364 | } | |
1365 | break; | |
1366 | case NFS3_CREATE_EXCLUSIVE: | |
2b0143b5 DH |
1367 | if ( d_inode(dchild)->i_mtime.tv_sec == v_mtime |
1368 | && d_inode(dchild)->i_atime.tv_sec == v_atime | |
1369 | && d_inode(dchild)->i_size == 0 ) { | |
7007c90f NB |
1370 | if (created) |
1371 | *created = 1; | |
1da177e4 | 1372 | break; |
7007c90f | 1373 | } |
ac6721a1 | 1374 | case NFS4_CREATE_EXCLUSIVE4_1: |
2b0143b5 DH |
1375 | if ( d_inode(dchild)->i_mtime.tv_sec == v_mtime |
1376 | && d_inode(dchild)->i_atime.tv_sec == v_atime | |
1377 | && d_inode(dchild)->i_size == 0 ) { | |
7007c90f NB |
1378 | if (created) |
1379 | *created = 1; | |
ac6721a1 | 1380 | goto set_attr; |
7007c90f | 1381 | } |
1da177e4 LT |
1382 | /* fallthru */ |
1383 | case NFS3_CREATE_GUARDED: | |
1384 | err = nfserr_exist; | |
1385 | } | |
bad0dcff | 1386 | fh_drop_write(fhp); |
1da177e4 LT |
1387 | goto out; |
1388 | } | |
1389 | ||
312b63fb | 1390 | host_err = vfs_create(dirp, dchild, iap->ia_mode, true); |
463c3197 | 1391 | if (host_err < 0) { |
bad0dcff | 1392 | fh_drop_write(fhp); |
1da177e4 | 1393 | goto out_nfserr; |
463c3197 | 1394 | } |
81ac95c5 BF |
1395 | if (created) |
1396 | *created = 1; | |
1da177e4 | 1397 | |
4ac35c2f | 1398 | nfsd_check_ignore_resizing(iap); |
1399 | ||
ac6721a1 | 1400 | if (nfsd_create_is_exclusive(createmode)) { |
c397852c | 1401 | /* Cram the verifier into atime/mtime */ |
1da177e4 | 1402 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
c397852c | 1403 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
1da177e4 LT |
1404 | /* XXX someone who knows this better please fix it for nsec */ |
1405 | iap->ia_mtime.tv_sec = v_mtime; | |
1406 | iap->ia_atime.tv_sec = v_atime; | |
1407 | iap->ia_mtime.tv_nsec = 0; | |
1408 | iap->ia_atime.tv_nsec = 0; | |
1da177e4 LT |
1409 | } |
1410 | ||
1da177e4 | 1411 | set_attr: |
f501912a BM |
1412 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
1413 | ||
1414 | /* | |
0f3a24b4 TM |
1415 | * nfsd_create_setattr already committed the child |
1416 | * (and possibly also the parent). | |
f501912a BM |
1417 | */ |
1418 | if (!err) | |
1419 | err = nfserrno(commit_metadata(fhp)); | |
f193fbab YT |
1420 | |
1421 | /* | |
1422 | * Update the filehandle to get the new inode info. | |
1423 | */ | |
1424 | if (!err) | |
1425 | err = fh_update(resfhp); | |
1da177e4 LT |
1426 | |
1427 | out: | |
1428 | fh_unlock(fhp); | |
1429 | if (dchild && !IS_ERR(dchild)) | |
1430 | dput(dchild); | |
4a55c101 | 1431 | fh_drop_write(fhp); |
1da177e4 LT |
1432 | return err; |
1433 | ||
1434 | out_nfserr: | |
6264d69d | 1435 | err = nfserrno(host_err); |
1da177e4 LT |
1436 | goto out; |
1437 | } | |
1438 | #endif /* CONFIG_NFSD_V3 */ | |
1439 | ||
1440 | /* | |
1441 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1442 | * fits into the buffer. On return, it contains the true length. | |
1443 | * N.B. After this call fhp needs an fh_put | |
1444 | */ | |
6264d69d | 1445 | __be32 |
1da177e4 LT |
1446 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1447 | { | |
1da177e4 | 1448 | mm_segment_t oldfs; |
6264d69d AV |
1449 | __be32 err; |
1450 | int host_err; | |
68ac1234 | 1451 | struct path path; |
1da177e4 | 1452 | |
8837abca | 1453 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
1da177e4 LT |
1454 | if (err) |
1455 | goto out; | |
1456 | ||
68ac1234 AV |
1457 | path.mnt = fhp->fh_export->ex_path.mnt; |
1458 | path.dentry = fhp->fh_dentry; | |
1da177e4 LT |
1459 | |
1460 | err = nfserr_inval; | |
fd4a0edf | 1461 | if (!d_is_symlink(path.dentry)) |
1da177e4 LT |
1462 | goto out; |
1463 | ||
68ac1234 | 1464 | touch_atime(&path); |
1da177e4 LT |
1465 | /* N.B. Why does this call need a get_fs()?? |
1466 | * Remove the set_fs and watch the fireworks:-) --okir | |
1467 | */ | |
1468 | ||
1469 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
fd4a0edf | 1470 | host_err = vfs_readlink(path.dentry, (char __user *)buf, *lenp); |
1da177e4 LT |
1471 | set_fs(oldfs); |
1472 | ||
6264d69d | 1473 | if (host_err < 0) |
1da177e4 | 1474 | goto out_nfserr; |
6264d69d | 1475 | *lenp = host_err; |
1da177e4 LT |
1476 | err = 0; |
1477 | out: | |
1478 | return err; | |
1479 | ||
1480 | out_nfserr: | |
6264d69d | 1481 | err = nfserrno(host_err); |
1da177e4 LT |
1482 | goto out; |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * Create a symlink and look up its inode | |
1487 | * N.B. After this call _both_ fhp and resfhp need an fh_put | |
1488 | */ | |
6264d69d | 1489 | __be32 |
1da177e4 LT |
1490 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1491 | char *fname, int flen, | |
52ee0433 | 1492 | char *path, |
1e444f5b | 1493 | struct svc_fh *resfhp) |
1da177e4 LT |
1494 | { |
1495 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1496 | __be32 err, cerr; |
1497 | int host_err; | |
1da177e4 LT |
1498 | |
1499 | err = nfserr_noent; | |
52ee0433 | 1500 | if (!flen || path[0] == '\0') |
1da177e4 LT |
1501 | goto out; |
1502 | err = nfserr_exist; | |
1503 | if (isdotent(fname, flen)) | |
1504 | goto out; | |
1505 | ||
8837abca | 1506 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1507 | if (err) |
1508 | goto out; | |
4a55c101 JK |
1509 | |
1510 | host_err = fh_want_write(fhp); | |
1511 | if (host_err) | |
1512 | goto out_nfserr; | |
1513 | ||
1da177e4 LT |
1514 | fh_lock(fhp); |
1515 | dentry = fhp->fh_dentry; | |
1516 | dnew = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1517 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1518 | if (IS_ERR(dnew)) |
1519 | goto out_nfserr; | |
1520 | ||
2b0143b5 | 1521 | host_err = vfs_symlink(d_inode(dentry), dnew, path); |
6264d69d | 1522 | err = nfserrno(host_err); |
f501912a BM |
1523 | if (!err) |
1524 | err = nfserrno(commit_metadata(fhp)); | |
1da177e4 LT |
1525 | fh_unlock(fhp); |
1526 | ||
bad0dcff | 1527 | fh_drop_write(fhp); |
75c3f29d | 1528 | |
1da177e4 LT |
1529 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
1530 | dput(dnew); | |
1531 | if (err==0) err = cerr; | |
1532 | out: | |
1533 | return err; | |
1534 | ||
1535 | out_nfserr: | |
6264d69d | 1536 | err = nfserrno(host_err); |
1da177e4 LT |
1537 | goto out; |
1538 | } | |
1539 | ||
1540 | /* | |
1541 | * Create a hardlink | |
1542 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1543 | */ | |
6264d69d | 1544 | __be32 |
1da177e4 LT |
1545 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1546 | char *name, int len, struct svc_fh *tfhp) | |
1547 | { | |
1548 | struct dentry *ddir, *dnew, *dold; | |
55b13354 | 1549 | struct inode *dirp; |
6264d69d AV |
1550 | __be32 err; |
1551 | int host_err; | |
1da177e4 | 1552 | |
8837abca | 1553 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1554 | if (err) |
1555 | goto out; | |
7d818a7b | 1556 | err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
1557 | if (err) |
1558 | goto out; | |
7d818a7b | 1559 | err = nfserr_isdir; |
e36cb0b8 | 1560 | if (d_is_dir(tfhp->fh_dentry)) |
7d818a7b | 1561 | goto out; |
1da177e4 LT |
1562 | err = nfserr_perm; |
1563 | if (!len) | |
1564 | goto out; | |
1565 | err = nfserr_exist; | |
1566 | if (isdotent(name, len)) | |
1567 | goto out; | |
1568 | ||
4a55c101 JK |
1569 | host_err = fh_want_write(tfhp); |
1570 | if (host_err) { | |
1571 | err = nfserrno(host_err); | |
1572 | goto out; | |
1573 | } | |
1574 | ||
12fd3520 | 1575 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
1da177e4 | 1576 | ddir = ffhp->fh_dentry; |
2b0143b5 | 1577 | dirp = d_inode(ddir); |
1da177e4 LT |
1578 | |
1579 | dnew = lookup_one_len(name, ddir, len); | |
6264d69d | 1580 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1581 | if (IS_ERR(dnew)) |
1582 | goto out_nfserr; | |
1583 | ||
1584 | dold = tfhp->fh_dentry; | |
1da177e4 | 1585 | |
4795bb37 | 1586 | err = nfserr_noent; |
2b0143b5 | 1587 | if (d_really_is_negative(dold)) |
4a55c101 | 1588 | goto out_dput; |
146a8595 | 1589 | host_err = vfs_link(dold, dirp, dnew, NULL); |
6264d69d | 1590 | if (!host_err) { |
f501912a BM |
1591 | err = nfserrno(commit_metadata(ffhp)); |
1592 | if (!err) | |
1593 | err = nfserrno(commit_metadata(tfhp)); | |
1da177e4 | 1594 | } else { |
6264d69d | 1595 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1596 | err = nfserr_acces; |
1597 | else | |
6264d69d | 1598 | err = nfserrno(host_err); |
1da177e4 | 1599 | } |
75c3f29d | 1600 | out_dput: |
1da177e4 | 1601 | dput(dnew); |
270d56e5 DR |
1602 | out_unlock: |
1603 | fh_unlock(ffhp); | |
4a55c101 | 1604 | fh_drop_write(tfhp); |
1da177e4 LT |
1605 | out: |
1606 | return err; | |
1607 | ||
1608 | out_nfserr: | |
6264d69d | 1609 | err = nfserrno(host_err); |
270d56e5 | 1610 | goto out_unlock; |
1da177e4 LT |
1611 | } |
1612 | ||
1613 | /* | |
1614 | * Rename a file | |
1615 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1616 | */ | |
6264d69d | 1617 | __be32 |
1da177e4 LT |
1618 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1619 | struct svc_fh *tfhp, char *tname, int tlen) | |
1620 | { | |
1621 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1622 | struct inode *fdir, *tdir; | |
6264d69d AV |
1623 | __be32 err; |
1624 | int host_err; | |
1da177e4 | 1625 | |
8837abca | 1626 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1627 | if (err) |
1628 | goto out; | |
8837abca | 1629 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1630 | if (err) |
1631 | goto out; | |
1632 | ||
1633 | fdentry = ffhp->fh_dentry; | |
2b0143b5 | 1634 | fdir = d_inode(fdentry); |
1da177e4 LT |
1635 | |
1636 | tdentry = tfhp->fh_dentry; | |
2b0143b5 | 1637 | tdir = d_inode(tdentry); |
1da177e4 | 1638 | |
1da177e4 LT |
1639 | err = nfserr_perm; |
1640 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1641 | goto out; | |
1642 | ||
4a55c101 JK |
1643 | host_err = fh_want_write(ffhp); |
1644 | if (host_err) { | |
1645 | err = nfserrno(host_err); | |
1646 | goto out; | |
1647 | } | |
1648 | ||
1da177e4 LT |
1649 | /* cannot use fh_lock as we need deadlock protective ordering |
1650 | * so do it by hand */ | |
1651 | trap = lock_rename(tdentry, fdentry); | |
aaf91ec1 | 1652 | ffhp->fh_locked = tfhp->fh_locked = true; |
1da177e4 LT |
1653 | fill_pre_wcc(ffhp); |
1654 | fill_pre_wcc(tfhp); | |
1655 | ||
1656 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1657 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1658 | if (IS_ERR(odentry)) |
1659 | goto out_nfserr; | |
1660 | ||
6264d69d | 1661 | host_err = -ENOENT; |
2b0143b5 | 1662 | if (d_really_is_negative(odentry)) |
1da177e4 | 1663 | goto out_dput_old; |
6264d69d | 1664 | host_err = -EINVAL; |
1da177e4 LT |
1665 | if (odentry == trap) |
1666 | goto out_dput_old; | |
1667 | ||
1668 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1669 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1670 | if (IS_ERR(ndentry)) |
1671 | goto out_dput_old; | |
6264d69d | 1672 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1673 | if (ndentry == trap) |
1674 | goto out_dput_new; | |
1675 | ||
9079b1eb DH |
1676 | host_err = -EXDEV; |
1677 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) | |
1678 | goto out_dput_new; | |
aa387d6c BF |
1679 | if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) |
1680 | goto out_dput_new; | |
9079b1eb | 1681 | |
520c8b16 | 1682 | host_err = vfs_rename(fdir, odentry, tdir, ndentry, NULL, 0); |
f501912a BM |
1683 | if (!host_err) { |
1684 | host_err = commit_metadata(tfhp); | |
6264d69d | 1685 | if (!host_err) |
f501912a | 1686 | host_err = commit_metadata(ffhp); |
1da177e4 | 1687 | } |
1da177e4 LT |
1688 | out_dput_new: |
1689 | dput(ndentry); | |
1690 | out_dput_old: | |
1691 | dput(odentry); | |
1692 | out_nfserr: | |
6264d69d | 1693 | err = nfserrno(host_err); |
fbb74a34 BF |
1694 | /* |
1695 | * We cannot rely on fh_unlock on the two filehandles, | |
1da177e4 | 1696 | * as that would do the wrong thing if the two directories |
fbb74a34 | 1697 | * were the same, so again we do it by hand. |
1da177e4 LT |
1698 | */ |
1699 | fill_post_wcc(ffhp); | |
1700 | fill_post_wcc(tfhp); | |
1701 | unlock_rename(tdentry, fdentry); | |
aaf91ec1 | 1702 | ffhp->fh_locked = tfhp->fh_locked = false; |
4a55c101 | 1703 | fh_drop_write(ffhp); |
1da177e4 LT |
1704 | |
1705 | out: | |
1706 | return err; | |
1707 | } | |
1708 | ||
1709 | /* | |
1710 | * Unlink a file or directory | |
1711 | * N.B. After this call fhp needs an fh_put | |
1712 | */ | |
6264d69d | 1713 | __be32 |
1da177e4 LT |
1714 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1715 | char *fname, int flen) | |
1716 | { | |
1717 | struct dentry *dentry, *rdentry; | |
1718 | struct inode *dirp; | |
6264d69d AV |
1719 | __be32 err; |
1720 | int host_err; | |
1da177e4 LT |
1721 | |
1722 | err = nfserr_acces; | |
1723 | if (!flen || isdotent(fname, flen)) | |
1724 | goto out; | |
8837abca | 1725 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1726 | if (err) |
1727 | goto out; | |
1728 | ||
4a55c101 JK |
1729 | host_err = fh_want_write(fhp); |
1730 | if (host_err) | |
1731 | goto out_nfserr; | |
1732 | ||
12fd3520 | 1733 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 | 1734 | dentry = fhp->fh_dentry; |
2b0143b5 | 1735 | dirp = d_inode(dentry); |
1da177e4 LT |
1736 | |
1737 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1738 | host_err = PTR_ERR(rdentry); |
1da177e4 LT |
1739 | if (IS_ERR(rdentry)) |
1740 | goto out_nfserr; | |
1741 | ||
2b0143b5 | 1742 | if (d_really_is_negative(rdentry)) { |
1da177e4 LT |
1743 | dput(rdentry); |
1744 | err = nfserr_noent; | |
1745 | goto out; | |
1746 | } | |
1747 | ||
1748 | if (!type) | |
2b0143b5 | 1749 | type = d_inode(rdentry)->i_mode & S_IFMT; |
1da177e4 | 1750 | |
9ce137ee | 1751 | if (type != S_IFDIR) |
b21996e3 | 1752 | host_err = vfs_unlink(dirp, rdentry, NULL); |
9ce137ee | 1753 | else |
6264d69d | 1754 | host_err = vfs_rmdir(dirp, rdentry); |
f501912a BM |
1755 | if (!host_err) |
1756 | host_err = commit_metadata(fhp); | |
541ce98c BF |
1757 | dput(rdentry); |
1758 | ||
1da177e4 | 1759 | out_nfserr: |
6264d69d | 1760 | err = nfserrno(host_err); |
f193fbab YT |
1761 | out: |
1762 | return err; | |
1da177e4 LT |
1763 | } |
1764 | ||
14f7dd63 DW |
1765 | /* |
1766 | * We do this buffering because we must not call back into the file | |
1767 | * system's ->lookup() method from the filldir callback. That may well | |
1768 | * deadlock a number of file systems. | |
1769 | * | |
1770 | * This is based heavily on the implementation of same in XFS. | |
1771 | */ | |
1772 | struct buffered_dirent { | |
1773 | u64 ino; | |
1774 | loff_t offset; | |
1775 | int namlen; | |
1776 | unsigned int d_type; | |
1777 | char name[]; | |
1778 | }; | |
1779 | ||
1780 | struct readdir_data { | |
5c0ba4e0 | 1781 | struct dir_context ctx; |
14f7dd63 DW |
1782 | char *dirent; |
1783 | size_t used; | |
53c9c5c0 | 1784 | int full; |
14f7dd63 DW |
1785 | }; |
1786 | ||
ac7576f4 MS |
1787 | static int nfsd_buffered_filldir(struct dir_context *ctx, const char *name, |
1788 | int namlen, loff_t offset, u64 ino, | |
1789 | unsigned int d_type) | |
14f7dd63 | 1790 | { |
ac7576f4 MS |
1791 | struct readdir_data *buf = |
1792 | container_of(ctx, struct readdir_data, ctx); | |
14f7dd63 DW |
1793 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); |
1794 | unsigned int reclen; | |
1795 | ||
1796 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); | |
53c9c5c0 AV |
1797 | if (buf->used + reclen > PAGE_SIZE) { |
1798 | buf->full = 1; | |
14f7dd63 | 1799 | return -EINVAL; |
53c9c5c0 | 1800 | } |
14f7dd63 DW |
1801 | |
1802 | de->namlen = namlen; | |
1803 | de->offset = offset; | |
1804 | de->ino = ino; | |
1805 | de->d_type = d_type; | |
1806 | memcpy(de->name, name, namlen); | |
1807 | buf->used += reclen; | |
1808 | ||
1809 | return 0; | |
1810 | } | |
1811 | ||
ac7576f4 | 1812 | static __be32 nfsd_buffered_readdir(struct file *file, nfsd_filldir_t func, |
2f9092e1 | 1813 | struct readdir_cd *cdp, loff_t *offsetp) |
2628b766 | 1814 | { |
14f7dd63 | 1815 | struct buffered_dirent *de; |
2628b766 | 1816 | int host_err; |
14f7dd63 DW |
1817 | int size; |
1818 | loff_t offset; | |
ac6614b7 AV |
1819 | struct readdir_data buf = { |
1820 | .ctx.actor = nfsd_buffered_filldir, | |
1821 | .dirent = (void *)__get_free_page(GFP_KERNEL) | |
1822 | }; | |
2628b766 | 1823 | |
14f7dd63 | 1824 | if (!buf.dirent) |
2f9092e1 | 1825 | return nfserrno(-ENOMEM); |
14f7dd63 DW |
1826 | |
1827 | offset = *offsetp; | |
2628b766 | 1828 | |
14f7dd63 DW |
1829 | while (1) { |
1830 | unsigned int reclen; | |
1831 | ||
b726e923 | 1832 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
14f7dd63 | 1833 | buf.used = 0; |
53c9c5c0 | 1834 | buf.full = 0; |
14f7dd63 | 1835 | |
5c0ba4e0 | 1836 | host_err = iterate_dir(file, &buf.ctx); |
53c9c5c0 AV |
1837 | if (buf.full) |
1838 | host_err = 0; | |
1839 | ||
1840 | if (host_err < 0) | |
14f7dd63 DW |
1841 | break; |
1842 | ||
1843 | size = buf.used; | |
1844 | ||
1845 | if (!size) | |
1846 | break; | |
1847 | ||
14f7dd63 DW |
1848 | de = (struct buffered_dirent *)buf.dirent; |
1849 | while (size > 0) { | |
1850 | offset = de->offset; | |
1851 | ||
1852 | if (func(cdp, de->name, de->namlen, de->offset, | |
1853 | de->ino, de->d_type)) | |
2f9092e1 | 1854 | break; |
14f7dd63 DW |
1855 | |
1856 | if (cdp->err != nfs_ok) | |
2f9092e1 | 1857 | break; |
14f7dd63 DW |
1858 | |
1859 | reclen = ALIGN(sizeof(*de) + de->namlen, | |
1860 | sizeof(u64)); | |
1861 | size -= reclen; | |
1862 | de = (struct buffered_dirent *)((char *)de + reclen); | |
1863 | } | |
2f9092e1 DW |
1864 | if (size > 0) /* We bailed out early */ |
1865 | break; | |
1866 | ||
c002a6c7 | 1867 | offset = vfs_llseek(file, 0, SEEK_CUR); |
14f7dd63 DW |
1868 | } |
1869 | ||
14f7dd63 | 1870 | free_page((unsigned long)(buf.dirent)); |
2628b766 DW |
1871 | |
1872 | if (host_err) | |
1873 | return nfserrno(host_err); | |
14f7dd63 DW |
1874 | |
1875 | *offsetp = offset; | |
1876 | return cdp->err; | |
2628b766 DW |
1877 | } |
1878 | ||
1da177e4 LT |
1879 | /* |
1880 | * Read entries from a directory. | |
1881 | * The NFSv3/4 verifier we ignore for now. | |
1882 | */ | |
6264d69d | 1883 | __be32 |
1da177e4 | 1884 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
ac7576f4 | 1885 | struct readdir_cd *cdp, nfsd_filldir_t func) |
1da177e4 | 1886 | { |
6264d69d | 1887 | __be32 err; |
1da177e4 LT |
1888 | struct file *file; |
1889 | loff_t offset = *offsetp; | |
06effdbb BS |
1890 | int may_flags = NFSD_MAY_READ; |
1891 | ||
1892 | /* NFSv2 only supports 32 bit cookies */ | |
1893 | if (rqstp->rq_vers > 2) | |
1894 | may_flags |= NFSD_MAY_64BIT_COOKIE; | |
1da177e4 | 1895 | |
06effdbb | 1896 | err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); |
1da177e4 LT |
1897 | if (err) |
1898 | goto out; | |
1899 | ||
b108fe6b | 1900 | offset = vfs_llseek(file, offset, SEEK_SET); |
1da177e4 LT |
1901 | if (offset < 0) { |
1902 | err = nfserrno((int)offset); | |
1903 | goto out_close; | |
1904 | } | |
1905 | ||
14f7dd63 | 1906 | err = nfsd_buffered_readdir(file, func, cdp, offsetp); |
1da177e4 LT |
1907 | |
1908 | if (err == nfserr_eof || err == nfserr_toosmall) | |
1909 | err = nfs_ok; /* can still be found in ->err */ | |
1910 | out_close: | |
fd891454 | 1911 | fput(file); |
1da177e4 LT |
1912 | out: |
1913 | return err; | |
1914 | } | |
1915 | ||
1916 | /* | |
1917 | * Get file system stats | |
1918 | * N.B. After this call fhp needs an fh_put | |
1919 | */ | |
6264d69d | 1920 | __be32 |
04716e66 | 1921 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) |
1da177e4 | 1922 | { |
ebabe9a9 CH |
1923 | __be32 err; |
1924 | ||
1925 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); | |
f6360efb TI |
1926 | if (!err) { |
1927 | struct path path = { | |
1928 | .mnt = fhp->fh_export->ex_path.mnt, | |
1929 | .dentry = fhp->fh_dentry, | |
1930 | }; | |
1931 | if (vfs_statfs(&path, stat)) | |
1932 | err = nfserr_io; | |
1933 | } | |
1da177e4 LT |
1934 | return err; |
1935 | } | |
1936 | ||
c7d51402 | 1937 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
e22841c6 | 1938 | { |
c7d51402 | 1939 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
e22841c6 BF |
1940 | } |
1941 | ||
1da177e4 LT |
1942 | /* |
1943 | * Check for a user's access permissions to this inode. | |
1944 | */ | |
6264d69d | 1945 | __be32 |
0ec757df BF |
1946 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
1947 | struct dentry *dentry, int acc) | |
1da177e4 | 1948 | { |
2b0143b5 | 1949 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
1950 | int err; |
1951 | ||
aea93397 | 1952 | if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) |
1da177e4 LT |
1953 | return 0; |
1954 | #if 0 | |
1955 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
1956 | acc, | |
8837abca MS |
1957 | (acc & NFSD_MAY_READ)? " read" : "", |
1958 | (acc & NFSD_MAY_WRITE)? " write" : "", | |
1959 | (acc & NFSD_MAY_EXEC)? " exec" : "", | |
1960 | (acc & NFSD_MAY_SATTR)? " sattr" : "", | |
1961 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", | |
1962 | (acc & NFSD_MAY_LOCK)? " lock" : "", | |
1963 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1da177e4 LT |
1964 | inode->i_mode, |
1965 | IS_IMMUTABLE(inode)? " immut" : "", | |
1966 | IS_APPEND(inode)? " append" : "", | |
2c463e95 | 1967 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
1da177e4 | 1968 | dprintk(" owner %d/%d user %d/%d\n", |
5cc0a840 | 1969 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
1da177e4 LT |
1970 | #endif |
1971 | ||
1972 | /* Normally we reject any write/sattr etc access on a read-only file | |
1973 | * system. But if it is IRIX doing check on write-access for a | |
1974 | * device special file, we ignore rofs. | |
1975 | */ | |
8837abca MS |
1976 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
1977 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { | |
2c463e95 DH |
1978 | if (exp_rdonly(rqstp, exp) || |
1979 | __mnt_is_readonly(exp->ex_path.mnt)) | |
1da177e4 | 1980 | return nfserr_rofs; |
8837abca | 1981 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
1da177e4 LT |
1982 | return nfserr_perm; |
1983 | } | |
8837abca | 1984 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
1da177e4 LT |
1985 | return nfserr_perm; |
1986 | ||
8837abca | 1987 | if (acc & NFSD_MAY_LOCK) { |
1da177e4 LT |
1988 | /* If we cannot rely on authentication in NLM requests, |
1989 | * just allow locks, otherwise require read permission, or | |
1990 | * ownership | |
1991 | */ | |
1992 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
1993 | return 0; | |
1994 | else | |
8837abca | 1995 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
1da177e4 LT |
1996 | } |
1997 | /* | |
1998 | * The file owner always gets access permission for accesses that | |
1999 | * would normally be checked at open time. This is to make | |
2000 | * file access work even when the client has done a fchmod(fd, 0). | |
2001 | * | |
2002 | * However, `cp foo bar' should fail nevertheless when bar is | |
2003 | * readonly. A sensible way to do this might be to reject all | |
2004 | * attempts to truncate a read-only file, because a creat() call | |
2005 | * always implies file truncation. | |
2006 | * ... but this isn't really fair. A process may reasonably call | |
2007 | * ftruncate on an open file descriptor on a file with perm 000. | |
2008 | * We must trust the client to do permission checking - using "ACCESS" | |
2009 | * with NFSv3. | |
2010 | */ | |
8837abca | 2011 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
6fab8779 | 2012 | uid_eq(inode->i_uid, current_fsuid())) |
1da177e4 LT |
2013 | return 0; |
2014 | ||
8837abca | 2015 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
f419a2e3 | 2016 | err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); |
1da177e4 LT |
2017 | |
2018 | /* Allow read access to binaries even when mode 111 */ | |
2019 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
a043226b BF |
2020 | (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || |
2021 | acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) | |
f419a2e3 | 2022 | err = inode_permission(inode, MAY_EXEC); |
1da177e4 LT |
2023 | |
2024 | return err? nfserrno(err) : 0; | |
2025 | } | |
2026 | ||
2027 | void | |
2028 | nfsd_racache_shutdown(void) | |
2029 | { | |
54a66e54 JL |
2030 | struct raparms *raparm, *last_raparm; |
2031 | unsigned int i; | |
2032 | ||
1da177e4 | 2033 | dprintk("nfsd: freeing readahead buffers.\n"); |
54a66e54 JL |
2034 | |
2035 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { | |
2036 | raparm = raparm_hash[i].pb_head; | |
2037 | while(raparm) { | |
2038 | last_raparm = raparm; | |
2039 | raparm = raparm->p_next; | |
2040 | kfree(last_raparm); | |
2041 | } | |
2042 | raparm_hash[i].pb_head = NULL; | |
2043 | } | |
1da177e4 LT |
2044 | } |
2045 | /* | |
2046 | * Initialize readahead param cache | |
2047 | */ | |
2048 | int | |
2049 | nfsd_racache_init(int cache_size) | |
2050 | { | |
2051 | int i; | |
fce1456a GB |
2052 | int j = 0; |
2053 | int nperbucket; | |
54a66e54 | 2054 | struct raparms **raparm = NULL; |
1da177e4 | 2055 | |
fce1456a | 2056 | |
54a66e54 | 2057 | if (raparm_hash[0].pb_head) |
1da177e4 | 2058 | return 0; |
54a66e54 | 2059 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
3c7aa15d | 2060 | nperbucket = max(2, nperbucket); |
54a66e54 | 2061 | cache_size = nperbucket * RAPARM_HASH_SIZE; |
4b3bb06b YB |
2062 | |
2063 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); | |
54a66e54 JL |
2064 | |
2065 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { | |
4b3bb06b | 2066 | spin_lock_init(&raparm_hash[i].pb_lock); |
54a66e54 JL |
2067 | |
2068 | raparm = &raparm_hash[i].pb_head; | |
2069 | for (j = 0; j < nperbucket; j++) { | |
2070 | *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); | |
2071 | if (!*raparm) | |
2072 | goto out_nomem; | |
2073 | raparm = &(*raparm)->p_next; | |
2074 | } | |
2075 | *raparm = NULL; | |
4b3bb06b YB |
2076 | } |
2077 | ||
1da177e4 LT |
2078 | nfsdstats.ra_size = cache_size; |
2079 | return 0; | |
54a66e54 JL |
2080 | |
2081 | out_nomem: | |
2082 | dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); | |
2083 | nfsd_racache_shutdown(); | |
2084 | return -ENOMEM; | |
1da177e4 | 2085 | } |