Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * File operations used by nfsd. Some of these have been ripped from |
3 | * other parts of the kernel because they weren't exported, others | |
4 | * are partial duplicates with added or changed functionality. | |
5 | * | |
6 | * Note that several functions dget() the dentry upon which they want | |
7 | * to act, most notably those that create directory entries. Response | |
8 | * dentry's are dput()'d if necessary in the release callback. | |
9 | * So if you notice code paths that apparently fail to dput() the | |
10 | * dentry, don't worry--they have been taken care of. | |
11 | * | |
12 | * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> | |
13 | * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> | |
14 | */ | |
15 | ||
1da177e4 LT |
16 | #include <linux/fs.h> |
17 | #include <linux/file.h> | |
d6b29d7c | 18 | #include <linux/splice.h> |
1da177e4 | 19 | #include <linux/fcntl.h> |
1da177e4 | 20 | #include <linux/namei.h> |
1da177e4 | 21 | #include <linux/delay.h> |
0eeca283 | 22 | #include <linux/fsnotify.h> |
1da177e4 | 23 | #include <linux/posix_acl_xattr.h> |
1da177e4 | 24 | #include <linux/xattr.h> |
9a74af21 BH |
25 | #include <linux/jhash.h> |
26 | #include <linux/ima.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
9a74af21 | 28 | #include <asm/uaccess.h> |
f501912a BM |
29 | #include <linux/exportfs.h> |
30 | #include <linux/writeback.h> | |
9a74af21 BH |
31 | |
32 | #ifdef CONFIG_NFSD_V3 | |
33 | #include "xdr3.h" | |
34 | #endif /* CONFIG_NFSD_V3 */ | |
35 | ||
5be196e5 | 36 | #ifdef CONFIG_NFSD_V4 |
2ca72e17 BF |
37 | #include "acl.h" |
38 | #include "idmap.h" | |
1da177e4 LT |
39 | #endif /* CONFIG_NFSD_V4 */ |
40 | ||
9a74af21 BH |
41 | #include "nfsd.h" |
42 | #include "vfs.h" | |
1da177e4 LT |
43 | |
44 | #define NFSDDBG_FACILITY NFSDDBG_FILEOP | |
1da177e4 LT |
45 | |
46 | ||
1da177e4 LT |
47 | /* |
48 | * This is a cache of readahead params that help us choose the proper | |
49 | * readahead strategy. Initially, we set all readahead parameters to 0 | |
50 | * and let the VFS handle things. | |
51 | * If you increase the number of cached files very much, you'll need to | |
52 | * add a hash table here. | |
53 | */ | |
54 | struct raparms { | |
55 | struct raparms *p_next; | |
56 | unsigned int p_count; | |
57 | ino_t p_ino; | |
58 | dev_t p_dev; | |
59 | int p_set; | |
60 | struct file_ra_state p_ra; | |
fce1456a | 61 | unsigned int p_hindex; |
1da177e4 LT |
62 | }; |
63 | ||
fce1456a GB |
64 | struct raparm_hbucket { |
65 | struct raparms *pb_head; | |
66 | spinlock_t pb_lock; | |
67 | } ____cacheline_aligned_in_smp; | |
68 | ||
fce1456a GB |
69 | #define RAPARM_HASH_BITS 4 |
70 | #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) | |
71 | #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) | |
72 | static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; | |
1da177e4 LT |
73 | |
74 | /* | |
75 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed | |
76 | * a mount point. | |
e0bb89ef | 77 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
1da177e4 LT |
78 | * or nfs_ok having possibly changed *dpp and *expp |
79 | */ | |
80 | int | |
81 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, | |
82 | struct svc_export **expp) | |
83 | { | |
84 | struct svc_export *exp = *expp, *exp2 = NULL; | |
85 | struct dentry *dentry = *dpp; | |
91c9fa8f AV |
86 | struct path path = {.mnt = mntget(exp->ex_path.mnt), |
87 | .dentry = dget(dentry)}; | |
6264d69d | 88 | int err = 0; |
1da177e4 | 89 | |
7cc90cc3 | 90 | err = follow_down(&path); |
cc53ce53 DH |
91 | if (err < 0) |
92 | goto out; | |
1da177e4 | 93 | |
91c9fa8f | 94 | exp2 = rqst_exp_get_by_name(rqstp, &path); |
1da177e4 | 95 | if (IS_ERR(exp2)) { |
3b6cee7b BF |
96 | err = PTR_ERR(exp2); |
97 | /* | |
98 | * We normally allow NFS clients to continue | |
99 | * "underneath" a mountpoint that is not exported. | |
100 | * The exception is V4ROOT, where no traversal is ever | |
101 | * allowed without an explicit export of the new | |
102 | * directory. | |
103 | */ | |
104 | if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) | |
105 | err = 0; | |
91c9fa8f | 106 | path_put(&path); |
1da177e4 LT |
107 | goto out; |
108 | } | |
3c394dda SD |
109 | if (nfsd_v4client(rqstp) || |
110 | (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { | |
1da177e4 | 111 | /* successfully crossed mount point */ |
1644ccc8 | 112 | /* |
91c9fa8f AV |
113 | * This is subtle: path.dentry is *not* on path.mnt |
114 | * at this point. The only reason we are safe is that | |
115 | * original mnt is pinned down by exp, so we should | |
116 | * put path *before* putting exp | |
1644ccc8 | 117 | */ |
91c9fa8f AV |
118 | *dpp = path.dentry; |
119 | path.dentry = dentry; | |
1644ccc8 | 120 | *expp = exp2; |
91c9fa8f | 121 | exp2 = exp; |
1da177e4 | 122 | } |
91c9fa8f AV |
123 | path_put(&path); |
124 | exp_put(exp2); | |
1da177e4 LT |
125 | out: |
126 | return err; | |
127 | } | |
128 | ||
289ede45 BF |
129 | static void follow_to_parent(struct path *path) |
130 | { | |
131 | struct dentry *dp; | |
132 | ||
133 | while (path->dentry == path->mnt->mnt_root && follow_up(path)) | |
134 | ; | |
135 | dp = dget_parent(path->dentry); | |
136 | dput(path->dentry); | |
137 | path->dentry = dp; | |
138 | } | |
139 | ||
140 | static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) | |
141 | { | |
142 | struct svc_export *exp2; | |
143 | struct path path = {.mnt = mntget((*exp)->ex_path.mnt), | |
144 | .dentry = dget(dparent)}; | |
145 | ||
146 | follow_to_parent(&path); | |
147 | ||
148 | exp2 = rqst_exp_parent(rqstp, &path); | |
149 | if (PTR_ERR(exp2) == -ENOENT) { | |
150 | *dentryp = dget(dparent); | |
151 | } else if (IS_ERR(exp2)) { | |
152 | path_put(&path); | |
153 | return PTR_ERR(exp2); | |
154 | } else { | |
155 | *dentryp = dget(path.dentry); | |
156 | exp_put(*exp); | |
157 | *exp = exp2; | |
158 | } | |
159 | path_put(&path); | |
160 | return 0; | |
161 | } | |
162 | ||
82ead7fe BF |
163 | /* |
164 | * For nfsd purposes, we treat V4ROOT exports as though there was an | |
165 | * export at *every* directory. | |
166 | */ | |
3227fa41 | 167 | int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) |
82ead7fe BF |
168 | { |
169 | if (d_mountpoint(dentry)) | |
170 | return 1; | |
11fcee02 TM |
171 | if (nfsd4_is_junction(dentry)) |
172 | return 1; | |
82ead7fe BF |
173 | if (!(exp->ex_flags & NFSEXP_V4ROOT)) |
174 | return 0; | |
175 | return dentry->d_inode != NULL; | |
176 | } | |
177 | ||
6264d69d | 178 | __be32 |
6c0a654d | 179 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
5a022fc8 | 180 | const char *name, unsigned int len, |
6c0a654d | 181 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
1da177e4 LT |
182 | { |
183 | struct svc_export *exp; | |
184 | struct dentry *dparent; | |
185 | struct dentry *dentry; | |
6264d69d | 186 | int host_err; |
1da177e4 LT |
187 | |
188 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); | |
189 | ||
1da177e4 LT |
190 | dparent = fhp->fh_dentry; |
191 | exp = fhp->fh_export; | |
192 | exp_get(exp); | |
193 | ||
1da177e4 LT |
194 | /* Lookup the name, but don't follow links */ |
195 | if (isdotent(name, len)) { | |
196 | if (len==1) | |
197 | dentry = dget(dparent); | |
54775491 | 198 | else if (dparent != exp->ex_path.dentry) |
1da177e4 | 199 | dentry = dget_parent(dparent); |
fed83811 | 200 | else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) |
1da177e4 LT |
201 | dentry = dget(dparent); /* .. == . just like at / */ |
202 | else { | |
203 | /* checking mountpoint crossing is very different when stepping up */ | |
289ede45 BF |
204 | host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); |
205 | if (host_err) | |
1da177e4 | 206 | goto out_nfserr; |
1da177e4 LT |
207 | } |
208 | } else { | |
209 | fh_lock(fhp); | |
210 | dentry = lookup_one_len(name, dparent, len); | |
6264d69d | 211 | host_err = PTR_ERR(dentry); |
1da177e4 LT |
212 | if (IS_ERR(dentry)) |
213 | goto out_nfserr; | |
214 | /* | |
215 | * check if we have crossed a mount point ... | |
216 | */ | |
82ead7fe | 217 | if (nfsd_mountpoint(dentry, exp)) { |
6264d69d | 218 | if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
1da177e4 LT |
219 | dput(dentry); |
220 | goto out_nfserr; | |
221 | } | |
222 | } | |
223 | } | |
6c0a654d BF |
224 | *dentry_ret = dentry; |
225 | *exp_ret = exp; | |
226 | return 0; | |
227 | ||
228 | out_nfserr: | |
229 | exp_put(exp); | |
230 | return nfserrno(host_err); | |
231 | } | |
232 | ||
233 | /* | |
234 | * Look up one component of a pathname. | |
235 | * N.B. After this call _both_ fhp and resfh need an fh_put | |
236 | * | |
237 | * If the lookup would cross a mountpoint, and the mounted filesystem | |
238 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is | |
239 | * accepted as it stands and the mounted directory is | |
240 | * returned. Otherwise the covered directory is returned. | |
241 | * NOTE: this mountpoint crossing is not supported properly by all | |
242 | * clients and is explicitly disallowed for NFSv3 | |
243 | * NeilBrown <neilb@cse.unsw.edu.au> | |
244 | */ | |
245 | __be32 | |
246 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, | |
5a022fc8 | 247 | unsigned int len, struct svc_fh *resfh) |
6c0a654d BF |
248 | { |
249 | struct svc_export *exp; | |
250 | struct dentry *dentry; | |
251 | __be32 err; | |
252 | ||
29a78a3e BF |
253 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
254 | if (err) | |
255 | return err; | |
6c0a654d BF |
256 | err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); |
257 | if (err) | |
258 | return err; | |
32c1eb0c AA |
259 | err = check_nfsd_access(exp, rqstp); |
260 | if (err) | |
261 | goto out; | |
1da177e4 LT |
262 | /* |
263 | * Note: we compose the file handle now, but as the | |
264 | * dentry may be negative, it may need to be updated. | |
265 | */ | |
266 | err = fh_compose(resfh, exp, dentry, fhp); | |
267 | if (!err && !dentry->d_inode) | |
268 | err = nfserr_noent; | |
32c1eb0c | 269 | out: |
1da177e4 | 270 | dput(dentry); |
1da177e4 LT |
271 | exp_put(exp); |
272 | return err; | |
1da177e4 LT |
273 | } |
274 | ||
4795bb37 BF |
275 | static int nfsd_break_lease(struct inode *inode) |
276 | { | |
277 | if (!S_ISREG(inode->i_mode)) | |
278 | return 0; | |
279 | return break_lease(inode, O_WRONLY | O_NONBLOCK); | |
280 | } | |
281 | ||
f501912a BM |
282 | /* |
283 | * Commit metadata changes to stable storage. | |
284 | */ | |
285 | static int | |
286 | commit_metadata(struct svc_fh *fhp) | |
287 | { | |
288 | struct inode *inode = fhp->fh_dentry->d_inode; | |
289 | const struct export_operations *export_ops = inode->i_sb->s_export_op; | |
f501912a BM |
290 | |
291 | if (!EX_ISSYNC(fhp->fh_export)) | |
292 | return 0; | |
293 | ||
c3765016 CH |
294 | if (export_ops->commit_metadata) |
295 | return export_ops->commit_metadata(inode); | |
296 | return sync_inode_metadata(inode, 1); | |
f501912a | 297 | } |
6c0a654d | 298 | |
1da177e4 LT |
299 | /* |
300 | * Set various file attributes. | |
301 | * N.B. After this call fhp needs an fh_put | |
302 | */ | |
6264d69d | 303 | __be32 |
1da177e4 LT |
304 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, |
305 | int check_guard, time_t guardtime) | |
306 | { | |
307 | struct dentry *dentry; | |
308 | struct inode *inode; | |
8837abca | 309 | int accmode = NFSD_MAY_SATTR; |
175a4eb7 | 310 | umode_t ftype = 0; |
6264d69d AV |
311 | __be32 err; |
312 | int host_err; | |
1da177e4 LT |
313 | int size_change = 0; |
314 | ||
315 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) | |
8837abca | 316 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; |
1da177e4 LT |
317 | if (iap->ia_valid & ATTR_SIZE) |
318 | ftype = S_IFREG; | |
319 | ||
320 | /* Get inode */ | |
321 | err = fh_verify(rqstp, fhp, ftype, accmode); | |
15b7a1b8 | 322 | if (err) |
1da177e4 LT |
323 | goto out; |
324 | ||
325 | dentry = fhp->fh_dentry; | |
326 | inode = dentry->d_inode; | |
327 | ||
15b7a1b8 N |
328 | /* Ignore any mode updates on symlinks */ |
329 | if (S_ISLNK(inode->i_mode)) | |
330 | iap->ia_valid &= ~ATTR_MODE; | |
331 | ||
332 | if (!iap->ia_valid) | |
333 | goto out; | |
334 | ||
9c85fca5 CH |
335 | /* |
336 | * NFSv2 does not differentiate between "set-[ac]time-to-now" | |
1da177e4 LT |
337 | * which only requires access, and "set-[ac]time-to-X" which |
338 | * requires ownership. | |
339 | * So if it looks like it might be "set both to the same time which | |
340 | * is close to now", and if inode_change_ok fails, then we | |
341 | * convert to "set to now" instead of "set to explicit time" | |
342 | * | |
343 | * We only call inode_change_ok as the last test as technically | |
344 | * it is not an interface that we should be using. It is only | |
345 | * valid if the filesystem does not define it's own i_op->setattr. | |
346 | */ | |
347 | #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) | |
348 | #define MAX_TOUCH_TIME_ERROR (30*60) | |
9c85fca5 CH |
349 | if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && |
350 | iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { | |
351 | /* | |
352 | * Looks probable. | |
353 | * | |
354 | * Now just make sure time is in the right ballpark. | |
355 | * Solaris, at least, doesn't seem to care what the time | |
356 | * request is. We require it be within 30 minutes of now. | |
1da177e4 | 357 | */ |
9c85fca5 CH |
358 | time_t delta = iap->ia_atime.tv_sec - get_seconds(); |
359 | if (delta < 0) | |
360 | delta = -delta; | |
361 | if (delta < MAX_TOUCH_TIME_ERROR && | |
362 | inode_change_ok(inode, iap) != 0) { | |
363 | /* | |
364 | * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. | |
365 | * This will cause notify_change to set these times | |
366 | * to "now" | |
367 | */ | |
368 | iap->ia_valid &= ~BOTH_TIME_SET; | |
369 | } | |
1da177e4 LT |
370 | } |
371 | ||
9c85fca5 CH |
372 | /* |
373 | * The size case is special. | |
374 | * It changes the file as well as the attributes. | |
375 | */ | |
1da177e4 LT |
376 | if (iap->ia_valid & ATTR_SIZE) { |
377 | if (iap->ia_size < inode->i_size) { | |
8837abca MS |
378 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, |
379 | NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); | |
1da177e4 LT |
380 | if (err) |
381 | goto out; | |
382 | } | |
383 | ||
6264d69d AV |
384 | host_err = get_write_access(inode); |
385 | if (host_err) | |
1da177e4 LT |
386 | goto out_nfserr; |
387 | ||
388 | size_change = 1; | |
6264d69d AV |
389 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); |
390 | if (host_err) { | |
1da177e4 LT |
391 | put_write_access(inode); |
392 | goto out_nfserr; | |
393 | } | |
1da177e4 LT |
394 | } |
395 | ||
ca456252 | 396 | /* sanitize the mode change */ |
1da177e4 LT |
397 | if (iap->ia_valid & ATTR_MODE) { |
398 | iap->ia_mode &= S_IALLUGO; | |
dee3209d | 399 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
ca456252 JL |
400 | } |
401 | ||
402 | /* Revoke setuid/setgid on chown */ | |
0953e620 SP |
403 | if (!S_ISDIR(inode->i_mode) && |
404 | (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || | |
405 | ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { | |
ca456252 JL |
406 | iap->ia_valid |= ATTR_KILL_PRIV; |
407 | if (iap->ia_valid & ATTR_MODE) { | |
408 | /* we're setting mode too, just clear the s*id bits */ | |
8a0ce7d9 | 409 | iap->ia_mode &= ~S_ISUID; |
ca456252 JL |
410 | if (iap->ia_mode & S_IXGRP) |
411 | iap->ia_mode &= ~S_ISGID; | |
412 | } else { | |
413 | /* set ATTR_KILL_* bits and let VFS handle it */ | |
414 | iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); | |
8a0ce7d9 | 415 | } |
1da177e4 LT |
416 | } |
417 | ||
1da177e4 LT |
418 | /* Change the attributes. */ |
419 | ||
420 | iap->ia_valid |= ATTR_CTIME; | |
421 | ||
422 | err = nfserr_notsync; | |
423 | if (!check_guard || guardtime == inode->i_ctime.tv_sec) { | |
4795bb37 | 424 | host_err = nfsd_break_lease(inode); |
6a76bebe BF |
425 | if (host_err) |
426 | goto out_nfserr; | |
1da177e4 | 427 | fh_lock(fhp); |
6a76bebe | 428 | |
6264d69d AV |
429 | host_err = notify_change(dentry, iap); |
430 | err = nfserrno(host_err); | |
1da177e4 LT |
431 | fh_unlock(fhp); |
432 | } | |
433 | if (size_change) | |
434 | put_write_access(inode); | |
435 | if (!err) | |
b160fdab | 436 | commit_metadata(fhp); |
1da177e4 LT |
437 | out: |
438 | return err; | |
439 | ||
440 | out_nfserr: | |
6264d69d | 441 | err = nfserrno(host_err); |
1da177e4 LT |
442 | goto out; |
443 | } | |
444 | ||
5be196e5 CH |
445 | #if defined(CONFIG_NFSD_V2_ACL) || \ |
446 | defined(CONFIG_NFSD_V3_ACL) || \ | |
447 | defined(CONFIG_NFSD_V4) | |
448 | static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) | |
449 | { | |
450 | ssize_t buflen; | |
6c6a426f | 451 | ssize_t ret; |
5be196e5 CH |
452 | |
453 | buflen = vfs_getxattr(dentry, key, NULL, 0); | |
454 | if (buflen <= 0) | |
455 | return buflen; | |
1da177e4 | 456 | |
5be196e5 CH |
457 | *buf = kmalloc(buflen, GFP_KERNEL); |
458 | if (!*buf) | |
459 | return -ENOMEM; | |
460 | ||
6c6a426f KK |
461 | ret = vfs_getxattr(dentry, key, *buf, buflen); |
462 | if (ret < 0) | |
463 | kfree(*buf); | |
464 | return ret; | |
5be196e5 CH |
465 | } |
466 | #endif | |
467 | ||
468 | #if defined(CONFIG_NFSD_V4) | |
1da177e4 LT |
469 | static int |
470 | set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) | |
471 | { | |
472 | int len; | |
473 | size_t buflen; | |
474 | char *buf = NULL; | |
475 | int error = 0; | |
1da177e4 LT |
476 | |
477 | buflen = posix_acl_xattr_size(pacl->a_count); | |
478 | buf = kmalloc(buflen, GFP_KERNEL); | |
479 | error = -ENOMEM; | |
480 | if (buf == NULL) | |
481 | goto out; | |
482 | ||
483 | len = posix_acl_to_xattr(pacl, buf, buflen); | |
484 | if (len < 0) { | |
485 | error = len; | |
486 | goto out; | |
487 | } | |
488 | ||
5be196e5 | 489 | error = vfs_setxattr(dentry, key, buf, len, 0); |
1da177e4 LT |
490 | out: |
491 | kfree(buf); | |
492 | return error; | |
493 | } | |
494 | ||
6264d69d | 495 | __be32 |
1da177e4 LT |
496 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
497 | struct nfs4_acl *acl) | |
498 | { | |
6264d69d AV |
499 | __be32 error; |
500 | int host_error; | |
1da177e4 LT |
501 | struct dentry *dentry; |
502 | struct inode *inode; | |
503 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
504 | unsigned int flags = 0; | |
505 | ||
506 | /* Get inode */ | |
e281d810 | 507 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_SATTR); |
1da177e4 | 508 | if (error) |
4b2ca38a | 509 | return error; |
1da177e4 LT |
510 | |
511 | dentry = fhp->fh_dentry; | |
512 | inode = dentry->d_inode; | |
513 | if (S_ISDIR(inode->i_mode)) | |
514 | flags = NFS4_ACL_DIR; | |
515 | ||
6264d69d AV |
516 | host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
517 | if (host_error == -EINVAL) { | |
4b2ca38a | 518 | return nfserr_attrnotsupp; |
6264d69d | 519 | } else if (host_error < 0) |
1da177e4 LT |
520 | goto out_nfserr; |
521 | ||
6264d69d AV |
522 | host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); |
523 | if (host_error < 0) | |
4b2ca38a | 524 | goto out_release; |
1da177e4 | 525 | |
4b2ca38a | 526 | if (S_ISDIR(inode->i_mode)) |
6264d69d | 527 | host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); |
1da177e4 | 528 | |
4b2ca38a | 529 | out_release: |
1da177e4 LT |
530 | posix_acl_release(pacl); |
531 | posix_acl_release(dpacl); | |
1da177e4 | 532 | out_nfserr: |
f34f9242 | 533 | if (host_error == -EOPNOTSUPP) |
4b2ca38a | 534 | return nfserr_attrnotsupp; |
f34f9242 | 535 | else |
4b2ca38a | 536 | return nfserrno(host_error); |
1da177e4 LT |
537 | } |
538 | ||
539 | static struct posix_acl * | |
540 | _get_posix_acl(struct dentry *dentry, char *key) | |
541 | { | |
5be196e5 | 542 | void *buf = NULL; |
1da177e4 | 543 | struct posix_acl *pacl = NULL; |
5be196e5 | 544 | int buflen; |
1da177e4 | 545 | |
5be196e5 CH |
546 | buflen = nfsd_getxattr(dentry, key, &buf); |
547 | if (!buflen) | |
548 | buflen = -ENODATA; | |
549 | if (buflen <= 0) | |
550 | return ERR_PTR(buflen); | |
1da177e4 LT |
551 | |
552 | pacl = posix_acl_from_xattr(buf, buflen); | |
1da177e4 LT |
553 | kfree(buf); |
554 | return pacl; | |
1da177e4 LT |
555 | } |
556 | ||
557 | int | |
558 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) | |
559 | { | |
560 | struct inode *inode = dentry->d_inode; | |
561 | int error = 0; | |
562 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
563 | unsigned int flags = 0; | |
564 | ||
9a59f452 | 565 | pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); |
1da177e4 LT |
566 | if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) |
567 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); | |
568 | if (IS_ERR(pacl)) { | |
569 | error = PTR_ERR(pacl); | |
570 | pacl = NULL; | |
571 | goto out; | |
572 | } | |
573 | ||
574 | if (S_ISDIR(inode->i_mode)) { | |
9a59f452 | 575 | dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); |
1da177e4 LT |
576 | if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) |
577 | dpacl = NULL; | |
578 | else if (IS_ERR(dpacl)) { | |
579 | error = PTR_ERR(dpacl); | |
580 | dpacl = NULL; | |
581 | goto out; | |
582 | } | |
583 | flags = NFS4_ACL_DIR; | |
584 | } | |
585 | ||
586 | *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); | |
587 | if (IS_ERR(*acl)) { | |
588 | error = PTR_ERR(*acl); | |
589 | *acl = NULL; | |
590 | } | |
591 | out: | |
592 | posix_acl_release(pacl); | |
593 | posix_acl_release(dpacl); | |
594 | return error; | |
595 | } | |
596 | ||
9b4146e8 CL |
597 | /* |
598 | * NFS junction information is stored in an extended attribute. | |
599 | */ | |
600 | #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" | |
601 | ||
602 | /** | |
603 | * nfsd4_is_junction - Test if an object could be an NFS junction | |
604 | * | |
605 | * @dentry: object to test | |
606 | * | |
607 | * Returns 1 if "dentry" appears to contain NFS junction information. | |
608 | * Otherwise 0 is returned. | |
609 | */ | |
11fcee02 TM |
610 | int nfsd4_is_junction(struct dentry *dentry) |
611 | { | |
612 | struct inode *inode = dentry->d_inode; | |
613 | ||
614 | if (inode == NULL) | |
615 | return 0; | |
616 | if (inode->i_mode & S_IXUGO) | |
617 | return 0; | |
618 | if (!(inode->i_mode & S_ISVTX)) | |
619 | return 0; | |
9b4146e8 | 620 | if (vfs_getxattr(dentry, NFSD_JUNCTION_XATTR_NAME, NULL, 0) <= 0) |
11fcee02 TM |
621 | return 0; |
622 | return 1; | |
623 | } | |
6a85d6c7 | 624 | #endif /* defined(CONFIG_NFSD_V4) */ |
1da177e4 LT |
625 | |
626 | #ifdef CONFIG_NFSD_V3 | |
627 | /* | |
628 | * Check server access rights to a file system object | |
629 | */ | |
630 | struct accessmap { | |
631 | u32 access; | |
632 | int how; | |
633 | }; | |
634 | static struct accessmap nfs3_regaccess[] = { | |
8837abca MS |
635 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
636 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
637 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, | |
638 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, | |
1da177e4 LT |
639 | |
640 | { 0, 0 } | |
641 | }; | |
642 | ||
643 | static struct accessmap nfs3_diraccess[] = { | |
8837abca MS |
644 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
645 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, | |
646 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, | |
647 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, | |
648 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, | |
1da177e4 LT |
649 | |
650 | { 0, 0 } | |
651 | }; | |
652 | ||
653 | static struct accessmap nfs3_anyaccess[] = { | |
654 | /* Some clients - Solaris 2.6 at least, make an access call | |
655 | * to the server to check for access for things like /dev/null | |
656 | * (which really, the server doesn't care about). So | |
657 | * We provide simple access checking for them, looking | |
658 | * mainly at mode bits, and we make sure to ignore read-only | |
659 | * filesystem checks | |
660 | */ | |
8837abca MS |
661 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
662 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
663 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
664 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
1da177e4 LT |
665 | |
666 | { 0, 0 } | |
667 | }; | |
668 | ||
6264d69d | 669 | __be32 |
1da177e4 LT |
670 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
671 | { | |
672 | struct accessmap *map; | |
673 | struct svc_export *export; | |
674 | struct dentry *dentry; | |
675 | u32 query, result = 0, sresult = 0; | |
6264d69d | 676 | __be32 error; |
1da177e4 | 677 | |
8837abca | 678 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
679 | if (error) |
680 | goto out; | |
681 | ||
682 | export = fhp->fh_export; | |
683 | dentry = fhp->fh_dentry; | |
684 | ||
685 | if (S_ISREG(dentry->d_inode->i_mode)) | |
686 | map = nfs3_regaccess; | |
687 | else if (S_ISDIR(dentry->d_inode->i_mode)) | |
688 | map = nfs3_diraccess; | |
689 | else | |
690 | map = nfs3_anyaccess; | |
691 | ||
692 | ||
693 | query = *access; | |
694 | for (; map->access; map++) { | |
695 | if (map->access & query) { | |
6264d69d | 696 | __be32 err2; |
1da177e4 LT |
697 | |
698 | sresult |= map->access; | |
699 | ||
0ec757df | 700 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
1da177e4 LT |
701 | switch (err2) { |
702 | case nfs_ok: | |
703 | result |= map->access; | |
704 | break; | |
705 | ||
706 | /* the following error codes just mean the access was not allowed, | |
707 | * rather than an error occurred */ | |
708 | case nfserr_rofs: | |
709 | case nfserr_acces: | |
710 | case nfserr_perm: | |
711 | /* simply don't "or" in the access bit. */ | |
712 | break; | |
713 | default: | |
714 | error = err2; | |
715 | goto out; | |
716 | } | |
717 | } | |
718 | } | |
719 | *access = result; | |
720 | if (supported) | |
721 | *supported = sresult; | |
722 | ||
723 | out: | |
724 | return error; | |
725 | } | |
726 | #endif /* CONFIG_NFSD_V3 */ | |
727 | ||
105f4622 BF |
728 | static int nfsd_open_break_lease(struct inode *inode, int access) |
729 | { | |
730 | unsigned int mode; | |
1da177e4 | 731 | |
105f4622 BF |
732 | if (access & NFSD_MAY_NOT_BREAK_LEASE) |
733 | return 0; | |
734 | mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; | |
735 | return break_lease(inode, mode | O_NONBLOCK); | |
736 | } | |
1da177e4 LT |
737 | |
738 | /* | |
739 | * Open an existing file or directory. | |
740 | * The access argument indicates the type of open (read/write/lock) | |
741 | * N.B. After this call fhp needs an fh_put | |
742 | */ | |
6264d69d | 743 | __be32 |
175a4eb7 | 744 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, |
1da177e4 LT |
745 | int access, struct file **filp) |
746 | { | |
747 | struct dentry *dentry; | |
748 | struct inode *inode; | |
6264d69d AV |
749 | int flags = O_RDONLY|O_LARGEFILE; |
750 | __be32 err; | |
91885258 | 751 | int host_err = 0; |
1da177e4 | 752 | |
e0e81739 DH |
753 | validate_process_creds(); |
754 | ||
1da177e4 LT |
755 | /* |
756 | * If we get here, then the client has already done an "open", | |
757 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE | |
758 | * in case a chmod has now revoked permission. | |
759 | */ | |
8837abca | 760 | err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); |
1da177e4 LT |
761 | if (err) |
762 | goto out; | |
763 | ||
764 | dentry = fhp->fh_dentry; | |
765 | inode = dentry->d_inode; | |
766 | ||
767 | /* Disallow write access to files with the append-only bit set | |
768 | * or any access when mandatory locking enabled | |
769 | */ | |
770 | err = nfserr_perm; | |
8837abca | 771 | if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) |
1da177e4 | 772 | goto out; |
5e7fc436 BF |
773 | /* |
774 | * We must ignore files (but only files) which might have mandatory | |
775 | * locks on them because there is no way to know if the accesser has | |
776 | * the lock. | |
777 | */ | |
778 | if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) | |
1da177e4 LT |
779 | goto out; |
780 | ||
781 | if (!inode->i_fop) | |
782 | goto out; | |
783 | ||
105f4622 | 784 | host_err = nfsd_open_break_lease(inode, access); |
6264d69d | 785 | if (host_err) /* NOMEM or WOULDBLOCK */ |
1da177e4 LT |
786 | goto out_nfserr; |
787 | ||
8837abca MS |
788 | if (access & NFSD_MAY_WRITE) { |
789 | if (access & NFSD_MAY_READ) | |
9ecb6a08 BF |
790 | flags = O_RDWR|O_LARGEFILE; |
791 | else | |
792 | flags = O_WRONLY|O_LARGEFILE; | |
1da177e4 | 793 | } |
54775491 | 794 | *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), |
033a666c | 795 | flags, current_cred()); |
1da177e4 | 796 | if (IS_ERR(*filp)) |
6264d69d | 797 | host_err = PTR_ERR(*filp); |
aeaa5ccd CE |
798 | else |
799 | host_err = ima_file_check(*filp, access); | |
1da177e4 | 800 | out_nfserr: |
6264d69d | 801 | err = nfserrno(host_err); |
1da177e4 | 802 | out: |
e0e81739 | 803 | validate_process_creds(); |
1da177e4 LT |
804 | return err; |
805 | } | |
806 | ||
807 | /* | |
808 | * Close a file. | |
809 | */ | |
810 | void | |
811 | nfsd_close(struct file *filp) | |
812 | { | |
813 | fput(filp); | |
814 | } | |
815 | ||
1da177e4 LT |
816 | /* |
817 | * Obtain the readahead parameters for the file | |
818 | * specified by (dev, ino). | |
819 | */ | |
1da177e4 LT |
820 | |
821 | static inline struct raparms * | |
822 | nfsd_get_raparms(dev_t dev, ino_t ino) | |
823 | { | |
824 | struct raparms *ra, **rap, **frap = NULL; | |
825 | int depth = 0; | |
fce1456a GB |
826 | unsigned int hash; |
827 | struct raparm_hbucket *rab; | |
828 | ||
829 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; | |
830 | rab = &raparm_hash[hash]; | |
1da177e4 | 831 | |
fce1456a GB |
832 | spin_lock(&rab->pb_lock); |
833 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { | |
1da177e4 LT |
834 | if (ra->p_ino == ino && ra->p_dev == dev) |
835 | goto found; | |
836 | depth++; | |
837 | if (ra->p_count == 0) | |
838 | frap = rap; | |
839 | } | |
3aa6e0aa | 840 | depth = nfsdstats.ra_size; |
1da177e4 | 841 | if (!frap) { |
fce1456a | 842 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
843 | return NULL; |
844 | } | |
845 | rap = frap; | |
846 | ra = *frap; | |
847 | ra->p_dev = dev; | |
848 | ra->p_ino = ino; | |
849 | ra->p_set = 0; | |
fce1456a | 850 | ra->p_hindex = hash; |
1da177e4 | 851 | found: |
fce1456a | 852 | if (rap != &rab->pb_head) { |
1da177e4 | 853 | *rap = ra->p_next; |
fce1456a GB |
854 | ra->p_next = rab->pb_head; |
855 | rab->pb_head = ra; | |
1da177e4 LT |
856 | } |
857 | ra->p_count++; | |
858 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; | |
fce1456a | 859 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
860 | return ra; |
861 | } | |
862 | ||
863 | /* | |
cf8208d0 JA |
864 | * Grab and keep cached pages associated with a file in the svc_rqst |
865 | * so that they can be passed to the network sendmsg/sendpage routines | |
866 | * directly. They will be released after the sending has completed. | |
1da177e4 LT |
867 | */ |
868 | static int | |
cf8208d0 JA |
869 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
870 | struct splice_desc *sd) | |
1da177e4 | 871 | { |
cf8208d0 | 872 | struct svc_rqst *rqstp = sd->u.data; |
44524359 | 873 | struct page **pp = rqstp->rq_respages + rqstp->rq_resused; |
cf8208d0 JA |
874 | struct page *page = buf->page; |
875 | size_t size; | |
cf8208d0 JA |
876 | |
877 | size = sd->len; | |
1da177e4 LT |
878 | |
879 | if (rqstp->rq_res.page_len == 0) { | |
880 | get_page(page); | |
44524359 N |
881 | put_page(*pp); |
882 | *pp = page; | |
883 | rqstp->rq_resused++; | |
cf8208d0 | 884 | rqstp->rq_res.page_base = buf->offset; |
1da177e4 | 885 | rqstp->rq_res.page_len = size; |
44524359 | 886 | } else if (page != pp[-1]) { |
1da177e4 | 887 | get_page(page); |
250f3915 N |
888 | if (*pp) |
889 | put_page(*pp); | |
44524359 N |
890 | *pp = page; |
891 | rqstp->rq_resused++; | |
1da177e4 | 892 | rqstp->rq_res.page_len += size; |
44524359 | 893 | } else |
1da177e4 | 894 | rqstp->rq_res.page_len += size; |
1da177e4 | 895 | |
1da177e4 LT |
896 | return size; |
897 | } | |
898 | ||
cf8208d0 JA |
899 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
900 | struct splice_desc *sd) | |
901 | { | |
902 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
903 | } | |
904 | ||
6264d69d | 905 | static __be32 |
1da177e4 LT |
906 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
907 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) | |
908 | { | |
1da177e4 | 909 | mm_segment_t oldfs; |
6264d69d AV |
910 | __be32 err; |
911 | int host_err; | |
1da177e4 LT |
912 | |
913 | err = nfserr_perm; | |
a8754bee | 914 | |
cf8208d0 JA |
915 | if (file->f_op->splice_read && rqstp->rq_splice_ok) { |
916 | struct splice_desc sd = { | |
917 | .len = 0, | |
918 | .total_len = *count, | |
919 | .pos = offset, | |
920 | .u.data = rqstp, | |
921 | }; | |
922 | ||
4fbef206 | 923 | rqstp->rq_resused = 1; |
cf8208d0 | 924 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
1da177e4 LT |
925 | } else { |
926 | oldfs = get_fs(); | |
927 | set_fs(KERNEL_DS); | |
6264d69d | 928 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
1da177e4 LT |
929 | set_fs(oldfs); |
930 | } | |
931 | ||
6264d69d AV |
932 | if (host_err >= 0) { |
933 | nfsdstats.io_read += host_err; | |
934 | *count = host_err; | |
1da177e4 | 935 | err = 0; |
2a12a9d7 | 936 | fsnotify_access(file); |
1da177e4 | 937 | } else |
6264d69d | 938 | err = nfserrno(host_err); |
1da177e4 LT |
939 | return err; |
940 | } | |
941 | ||
9f708e40 NB |
942 | static void kill_suid(struct dentry *dentry) |
943 | { | |
944 | struct iattr ia; | |
b5376771 | 945 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; |
9f708e40 | 946 | |
1b1dcc1b | 947 | mutex_lock(&dentry->d_inode->i_mutex); |
9f708e40 | 948 | notify_change(dentry, &ia); |
1b1dcc1b | 949 | mutex_unlock(&dentry->d_inode->i_mutex); |
9f708e40 NB |
950 | } |
951 | ||
d911df7b BF |
952 | /* |
953 | * Gathered writes: If another process is currently writing to the file, | |
954 | * there's a high chance this is another nfsd (triggered by a bulk write | |
955 | * from a client's biod). Rather than syncing the file with each write | |
956 | * request, we sleep for 10 msec. | |
957 | * | |
958 | * I don't know if this roughly approximates C. Juszak's idea of | |
959 | * gathered writes, but it's a nice and simple solution (IMHO), and it | |
960 | * seems to work:-) | |
961 | * | |
962 | * Note: we do this only in the NFSv2 case, since v3 and higher have a | |
963 | * better tool (separate unstable writes and commits) for solving this | |
964 | * problem. | |
965 | */ | |
966 | static int wait_for_concurrent_writes(struct file *file) | |
967 | { | |
968 | struct inode *inode = file->f_path.dentry->d_inode; | |
969 | static ino_t last_ino; | |
970 | static dev_t last_dev; | |
971 | int err = 0; | |
972 | ||
973 | if (atomic_read(&inode->i_writecount) > 1 | |
974 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
975 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); | |
976 | msleep(10); | |
977 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); | |
978 | } | |
979 | ||
980 | if (inode->i_state & I_DIRTY) { | |
981 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); | |
8018ab05 | 982 | err = vfs_fsync(file, 0); |
d911df7b BF |
983 | } |
984 | last_ino = inode->i_ino; | |
985 | last_dev = inode->i_sb->s_dev; | |
986 | return err; | |
987 | } | |
988 | ||
6264d69d | 989 | static __be32 |
1da177e4 LT |
990 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
991 | loff_t offset, struct kvec *vec, int vlen, | |
31dec253 | 992 | unsigned long *cnt, int *stablep) |
1da177e4 LT |
993 | { |
994 | struct svc_export *exp; | |
995 | struct dentry *dentry; | |
996 | struct inode *inode; | |
997 | mm_segment_t oldfs; | |
6264d69d AV |
998 | __be32 err = 0; |
999 | int host_err; | |
1da177e4 | 1000 | int stable = *stablep; |
48e03bc5 | 1001 | int use_wgather; |
1da177e4 | 1002 | |
7eaa36e2 | 1003 | dentry = file->f_path.dentry; |
1da177e4 LT |
1004 | inode = dentry->d_inode; |
1005 | exp = fhp->fh_export; | |
1006 | ||
1007 | /* | |
1008 | * Request sync writes if | |
1009 | * - the sync export option has been set, or | |
1010 | * - the client requested O_SYNC behavior (NFSv3 feature). | |
1011 | * - The file system doesn't support fsync(). | |
48e03bc5 | 1012 | * When NFSv2 gathered writes have been configured for this volume, |
1da177e4 LT |
1013 | * flushing the data to disk is handled separately below. |
1014 | */ | |
48e03bc5 | 1015 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
1da177e4 | 1016 | |
3ba15148 | 1017 | if (!file->f_op->fsync) {/* COMMIT3 cannot work */ |
1da177e4 LT |
1018 | stable = 2; |
1019 | *stablep = 2; /* FILE_SYNC */ | |
1020 | } | |
1021 | ||
1022 | if (!EX_ISSYNC(exp)) | |
1023 | stable = 0; | |
48e03bc5 | 1024 | if (stable && !use_wgather) { |
db1dd4d3 | 1025 | spin_lock(&file->f_lock); |
1da177e4 | 1026 | file->f_flags |= O_SYNC; |
db1dd4d3 JC |
1027 | spin_unlock(&file->f_lock); |
1028 | } | |
1da177e4 LT |
1029 | |
1030 | /* Write the data. */ | |
1031 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
6264d69d | 1032 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); |
1da177e4 | 1033 | set_fs(oldfs); |
e4636d53 BF |
1034 | if (host_err < 0) |
1035 | goto out_nfserr; | |
1036 | *cnt = host_err; | |
1037 | nfsdstats.io_write += host_err; | |
2a12a9d7 | 1038 | fsnotify_modify(file); |
1da177e4 LT |
1039 | |
1040 | /* clear setuid/setgid flag after write */ | |
e4636d53 | 1041 | if (inode->i_mode & (S_ISUID | S_ISGID)) |
9f708e40 | 1042 | kill_suid(dentry); |
1da177e4 | 1043 | |
e4636d53 | 1044 | if (stable && use_wgather) |
d911df7b | 1045 | host_err = wait_for_concurrent_writes(file); |
1da177e4 | 1046 | |
e4636d53 | 1047 | out_nfserr: |
6264d69d | 1048 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
a0d24b29 | 1049 | if (host_err >= 0) |
1da177e4 | 1050 | err = 0; |
a0d24b29 | 1051 | else |
6264d69d | 1052 | err = nfserrno(host_err); |
1da177e4 LT |
1053 | return err; |
1054 | } | |
1055 | ||
1056 | /* | |
1057 | * Read data from a file. count must contain the requested read count | |
1058 | * on entry. On return, *count contains the number of bytes actually read. | |
1059 | * N.B. After this call fhp needs an fh_put | |
1060 | */ | |
039a87ca | 1061 | __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
fa0a2126 BF |
1062 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) |
1063 | { | |
1064 | struct file *file; | |
1065 | struct inode *inode; | |
1066 | struct raparms *ra; | |
1067 | __be32 err; | |
1068 | ||
1069 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); | |
1070 | if (err) | |
1071 | return err; | |
1072 | ||
1073 | inode = file->f_path.dentry->d_inode; | |
1074 | ||
1075 | /* Get readahead parameters */ | |
1076 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); | |
1077 | ||
1078 | if (ra && ra->p_set) | |
1079 | file->f_ra = ra->p_ra; | |
1080 | ||
1081 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
1082 | ||
1083 | /* Write back readahead params */ | |
1084 | if (ra) { | |
1085 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; | |
1086 | spin_lock(&rab->pb_lock); | |
1087 | ra->p_ra = file->f_ra; | |
1088 | ra->p_set = 1; | |
1089 | ra->p_count--; | |
1090 | spin_unlock(&rab->pb_lock); | |
1091 | } | |
1092 | ||
1093 | nfsd_close(file); | |
1094 | return err; | |
1095 | } | |
1096 | ||
039a87ca | 1097 | /* As above, but use the provided file descriptor. */ |
6264d69d | 1098 | __be32 |
039a87ca | 1099 | nfsd_read_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1da177e4 LT |
1100 | loff_t offset, struct kvec *vec, int vlen, |
1101 | unsigned long *count) | |
1102 | { | |
6264d69d | 1103 | __be32 err; |
1da177e4 LT |
1104 | |
1105 | if (file) { | |
0ec757df | 1106 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
8837abca | 1107 | NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); |
1da177e4 LT |
1108 | if (err) |
1109 | goto out; | |
1110 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
039a87ca BF |
1111 | } else /* Note file may still be NULL in NFSv4 special stateid case: */ |
1112 | err = nfsd_read(rqstp, fhp, offset, vec, vlen, count); | |
1da177e4 LT |
1113 | out: |
1114 | return err; | |
1115 | } | |
1116 | ||
1117 | /* | |
1118 | * Write data to a file. | |
1119 | * The stable flag requests synchronous writes. | |
1120 | * N.B. After this call fhp needs an fh_put | |
1121 | */ | |
6264d69d | 1122 | __be32 |
1da177e4 | 1123 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
31dec253 | 1124 | loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, |
1da177e4 LT |
1125 | int *stablep) |
1126 | { | |
6264d69d | 1127 | __be32 err = 0; |
1da177e4 LT |
1128 | |
1129 | if (file) { | |
0ec757df | 1130 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
8837abca | 1131 | NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); |
1da177e4 LT |
1132 | if (err) |
1133 | goto out; | |
1134 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, | |
1135 | stablep); | |
1136 | } else { | |
8837abca | 1137 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
1da177e4 LT |
1138 | if (err) |
1139 | goto out; | |
1140 | ||
1141 | if (cnt) | |
1142 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, | |
1143 | cnt, stablep); | |
1144 | nfsd_close(file); | |
1145 | } | |
1146 | out: | |
1147 | return err; | |
1148 | } | |
1149 | ||
1150 | #ifdef CONFIG_NFSD_V3 | |
1151 | /* | |
1152 | * Commit all pending writes to stable storage. | |
aa696a6f TM |
1153 | * |
1154 | * Note: we only guarantee that data that lies within the range specified | |
1155 | * by the 'offset' and 'count' parameters will be synced. | |
1da177e4 LT |
1156 | * |
1157 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1158 | * data to the client, as locking happens lower down in the filesystem. | |
1159 | */ | |
6264d69d | 1160 | __be32 |
1da177e4 LT |
1161 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1162 | loff_t offset, unsigned long count) | |
1163 | { | |
1164 | struct file *file; | |
aa696a6f TM |
1165 | loff_t end = LLONG_MAX; |
1166 | __be32 err = nfserr_inval; | |
1da177e4 | 1167 | |
aa696a6f TM |
1168 | if (offset < 0) |
1169 | goto out; | |
1170 | if (count != 0) { | |
1171 | end = offset + (loff_t)count - 1; | |
1172 | if (end < offset) | |
1173 | goto out; | |
1174 | } | |
1da177e4 | 1175 | |
91885258 JL |
1176 | err = nfsd_open(rqstp, fhp, S_IFREG, |
1177 | NFSD_MAY_WRITE|NFSD_MAY_NOT_BREAK_LEASE, &file); | |
8837abca | 1178 | if (err) |
aa696a6f | 1179 | goto out; |
1da177e4 | 1180 | if (EX_ISSYNC(fhp->fh_export)) { |
8018ab05 | 1181 | int err2 = vfs_fsync_range(file, offset, end, 0); |
aa696a6f TM |
1182 | |
1183 | if (err2 != -EINVAL) | |
1184 | err = nfserrno(err2); | |
1185 | else | |
1da177e4 | 1186 | err = nfserr_notsupp; |
1da177e4 LT |
1187 | } |
1188 | ||
1189 | nfsd_close(file); | |
aa696a6f | 1190 | out: |
1da177e4 LT |
1191 | return err; |
1192 | } | |
1193 | #endif /* CONFIG_NFSD_V3 */ | |
1194 | ||
f2b0dee2 | 1195 | static __be32 |
5c002b3b BF |
1196 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, |
1197 | struct iattr *iap) | |
1198 | { | |
1199 | /* | |
1200 | * Mode has already been set earlier in create: | |
1201 | */ | |
1202 | iap->ia_valid &= ~ATTR_MODE; | |
1203 | /* | |
1204 | * Setting uid/gid works only for root. Irix appears to | |
1205 | * send along the gid on create when it tries to implement | |
1206 | * setgid directories via NFS: | |
1207 | */ | |
5cc0a840 | 1208 | if (current_fsuid() != 0) |
5c002b3b BF |
1209 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
1210 | if (iap->ia_valid) | |
1211 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); | |
1212 | return 0; | |
1213 | } | |
1214 | ||
4ac35c2f | 1215 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
1216 | * setting size to 0 may fail for some specific file systems by the permission | |
1217 | * checking which requires WRITE permission but the mode is 000. | |
1218 | * we ignore the resizing(to 0) on the just new created file, since the size is | |
1219 | * 0 after file created. | |
1220 | * | |
1221 | * call this only after vfs_create() is called. | |
1222 | * */ | |
1223 | static void | |
1224 | nfsd_check_ignore_resizing(struct iattr *iap) | |
1225 | { | |
1226 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) | |
1227 | iap->ia_valid &= ~ATTR_SIZE; | |
1228 | } | |
1229 | ||
1da177e4 LT |
1230 | /* |
1231 | * Create a file (regular, directory, device, fifo); UNIX sockets | |
1232 | * not yet implemented. | |
1233 | * If the response fh has been verified, the parent directory should | |
1234 | * already be locked. Note that the parent directory is left locked. | |
1235 | * | |
1236 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1237 | */ | |
6264d69d | 1238 | __be32 |
1da177e4 LT |
1239 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1240 | char *fname, int flen, struct iattr *iap, | |
1241 | int type, dev_t rdev, struct svc_fh *resfhp) | |
1242 | { | |
1243 | struct dentry *dentry, *dchild = NULL; | |
1244 | struct inode *dirp; | |
6264d69d | 1245 | __be32 err; |
5c002b3b | 1246 | __be32 err2; |
6264d69d | 1247 | int host_err; |
1da177e4 LT |
1248 | |
1249 | err = nfserr_perm; | |
1250 | if (!flen) | |
1251 | goto out; | |
1252 | err = nfserr_exist; | |
1253 | if (isdotent(fname, flen)) | |
1254 | goto out; | |
1255 | ||
8837abca | 1256 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1257 | if (err) |
1258 | goto out; | |
1259 | ||
1260 | dentry = fhp->fh_dentry; | |
1261 | dirp = dentry->d_inode; | |
1262 | ||
1263 | err = nfserr_notdir; | |
acfa4380 | 1264 | if (!dirp->i_op->lookup) |
1da177e4 LT |
1265 | goto out; |
1266 | /* | |
1267 | * Check whether the response file handle has been verified yet. | |
1268 | * If it has, the parent directory should already be locked. | |
1269 | */ | |
1270 | if (!resfhp->fh_dentry) { | |
1271 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ | |
12fd3520 | 1272 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 | 1273 | dchild = lookup_one_len(fname, dentry, flen); |
6264d69d | 1274 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1275 | if (IS_ERR(dchild)) |
1276 | goto out_nfserr; | |
1277 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
1278 | if (err) | |
1279 | goto out; | |
1280 | } else { | |
1281 | /* called from nfsd_proc_create */ | |
1282 | dchild = dget(resfhp->fh_dentry); | |
1283 | if (!fhp->fh_locked) { | |
1284 | /* not actually possible */ | |
1285 | printk(KERN_ERR | |
1286 | "nfsd_create: parent %s/%s not locked!\n", | |
1287 | dentry->d_parent->d_name.name, | |
1288 | dentry->d_name.name); | |
d75f2b9f | 1289 | err = nfserr_io; |
1da177e4 LT |
1290 | goto out; |
1291 | } | |
1292 | } | |
1293 | /* | |
1294 | * Make sure the child dentry is still negative ... | |
1295 | */ | |
1296 | err = nfserr_exist; | |
1297 | if (dchild->d_inode) { | |
1298 | dprintk("nfsd_create: dentry %s/%s not negative!\n", | |
1299 | dentry->d_name.name, dchild->d_name.name); | |
1300 | goto out; | |
1301 | } | |
1302 | ||
1303 | if (!(iap->ia_valid & ATTR_MODE)) | |
1304 | iap->ia_mode = 0; | |
1305 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1306 | ||
07cad1d2 MS |
1307 | err = nfserr_inval; |
1308 | if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { | |
1309 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", | |
1310 | type); | |
1311 | goto out; | |
1312 | } | |
1313 | ||
bad0dcff | 1314 | host_err = fh_want_write(fhp); |
07cad1d2 MS |
1315 | if (host_err) |
1316 | goto out_nfserr; | |
1317 | ||
1da177e4 LT |
1318 | /* |
1319 | * Get the dir op function pointer. | |
1320 | */ | |
088406bc | 1321 | err = 0; |
1da177e4 LT |
1322 | switch (type) { |
1323 | case S_IFREG: | |
6264d69d | 1324 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
4ac35c2f | 1325 | if (!host_err) |
1326 | nfsd_check_ignore_resizing(iap); | |
1da177e4 LT |
1327 | break; |
1328 | case S_IFDIR: | |
6264d69d | 1329 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
1da177e4 LT |
1330 | break; |
1331 | case S_IFCHR: | |
1332 | case S_IFBLK: | |
1333 | case S_IFIFO: | |
1334 | case S_IFSOCK: | |
6264d69d | 1335 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
1da177e4 | 1336 | break; |
1da177e4 | 1337 | } |
463c3197 | 1338 | if (host_err < 0) { |
bad0dcff | 1339 | fh_drop_write(fhp); |
1da177e4 | 1340 | goto out_nfserr; |
463c3197 | 1341 | } |
1da177e4 | 1342 | |
f501912a | 1343 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
1da177e4 | 1344 | |
f501912a BM |
1345 | /* |
1346 | * nfsd_setattr already committed the child. Transactional filesystems | |
1347 | * had a chance to commit changes for both parent and child | |
1348 | * simultaneously making the following commit_metadata a noop. | |
1349 | */ | |
1350 | err2 = nfserrno(commit_metadata(fhp)); | |
5c002b3b BF |
1351 | if (err2) |
1352 | err = err2; | |
bad0dcff | 1353 | fh_drop_write(fhp); |
1da177e4 LT |
1354 | /* |
1355 | * Update the file handle to get the new inode info. | |
1356 | */ | |
1357 | if (!err) | |
1358 | err = fh_update(resfhp); | |
1359 | out: | |
1360 | if (dchild && !IS_ERR(dchild)) | |
1361 | dput(dchild); | |
1362 | return err; | |
1363 | ||
1364 | out_nfserr: | |
6264d69d | 1365 | err = nfserrno(host_err); |
1da177e4 LT |
1366 | goto out; |
1367 | } | |
1368 | ||
1369 | #ifdef CONFIG_NFSD_V3 | |
ac6721a1 MJ |
1370 | |
1371 | static inline int nfsd_create_is_exclusive(int createmode) | |
1372 | { | |
1373 | return createmode == NFS3_CREATE_EXCLUSIVE | |
1374 | || createmode == NFS4_CREATE_EXCLUSIVE4_1; | |
1375 | } | |
1376 | ||
1da177e4 | 1377 | /* |
ac6721a1 | 1378 | * NFSv3 and NFSv4 version of nfsd_create |
1da177e4 | 1379 | */ |
6264d69d | 1380 | __be32 |
ac6721a1 | 1381 | do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1da177e4 LT |
1382 | char *fname, int flen, struct iattr *iap, |
1383 | struct svc_fh *resfhp, int createmode, u32 *verifier, | |
856121b2 | 1384 | bool *truncp, bool *created) |
1da177e4 LT |
1385 | { |
1386 | struct dentry *dentry, *dchild = NULL; | |
1387 | struct inode *dirp; | |
6264d69d AV |
1388 | __be32 err; |
1389 | int host_err; | |
1da177e4 | 1390 | __u32 v_mtime=0, v_atime=0; |
1da177e4 LT |
1391 | |
1392 | err = nfserr_perm; | |
1393 | if (!flen) | |
1394 | goto out; | |
1395 | err = nfserr_exist; | |
1396 | if (isdotent(fname, flen)) | |
1397 | goto out; | |
1398 | if (!(iap->ia_valid & ATTR_MODE)) | |
1399 | iap->ia_mode = 0; | |
1574dff8 | 1400 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
1da177e4 LT |
1401 | if (err) |
1402 | goto out; | |
1403 | ||
1404 | dentry = fhp->fh_dentry; | |
1405 | dirp = dentry->d_inode; | |
1406 | ||
1407 | /* Get all the sanity checks out of the way before | |
1408 | * we lock the parent. */ | |
1409 | err = nfserr_notdir; | |
acfa4380 | 1410 | if (!dirp->i_op->lookup) |
1da177e4 | 1411 | goto out; |
12fd3520 | 1412 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1413 | |
1414 | /* | |
1415 | * Compose the response file handle. | |
1416 | */ | |
1417 | dchild = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1418 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1419 | if (IS_ERR(dchild)) |
1420 | goto out_nfserr; | |
1421 | ||
1574dff8 SP |
1422 | /* If file doesn't exist, check for permissions to create one */ |
1423 | if (!dchild->d_inode) { | |
1424 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); | |
1425 | if (err) | |
1426 | goto out; | |
1427 | } | |
1428 | ||
1da177e4 LT |
1429 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
1430 | if (err) | |
1431 | goto out; | |
1432 | ||
ac6721a1 | 1433 | if (nfsd_create_is_exclusive(createmode)) { |
c397852c | 1434 | /* solaris7 gets confused (bugid 4218508) if these have |
749997e5 JL |
1435 | * the high bit set, so just clear the high bits. If this is |
1436 | * ever changed to use different attrs for storing the | |
1437 | * verifier, then do_open_lookup() will also need to be fixed | |
1438 | * accordingly. | |
1da177e4 LT |
1439 | */ |
1440 | v_mtime = verifier[0]&0x7fffffff; | |
1441 | v_atime = verifier[1]&0x7fffffff; | |
1da177e4 LT |
1442 | } |
1443 | ||
bad0dcff | 1444 | host_err = fh_want_write(fhp); |
463c3197 DH |
1445 | if (host_err) |
1446 | goto out_nfserr; | |
1da177e4 LT |
1447 | if (dchild->d_inode) { |
1448 | err = 0; | |
1449 | ||
1450 | switch (createmode) { | |
1451 | case NFS3_CREATE_UNCHECKED: | |
1452 | if (! S_ISREG(dchild->d_inode->i_mode)) | |
1453 | err = nfserr_exist; | |
1454 | else if (truncp) { | |
1455 | /* in nfsv4, we need to treat this case a little | |
1456 | * differently. we don't want to truncate the | |
1457 | * file now; this would be wrong if the OPEN | |
1458 | * fails for some other reason. furthermore, | |
1459 | * if the size is nonzero, we should ignore it | |
1460 | * according to spec! | |
1461 | */ | |
1462 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; | |
1463 | } | |
1464 | else { | |
1465 | iap->ia_valid &= ATTR_SIZE; | |
1466 | goto set_attr; | |
1467 | } | |
1468 | break; | |
1469 | case NFS3_CREATE_EXCLUSIVE: | |
1470 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime | |
1471 | && dchild->d_inode->i_atime.tv_sec == v_atime | |
1da177e4 LT |
1472 | && dchild->d_inode->i_size == 0 ) |
1473 | break; | |
ac6721a1 MJ |
1474 | case NFS4_CREATE_EXCLUSIVE4_1: |
1475 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime | |
1476 | && dchild->d_inode->i_atime.tv_sec == v_atime | |
1477 | && dchild->d_inode->i_size == 0 ) | |
1478 | goto set_attr; | |
1da177e4 LT |
1479 | /* fallthru */ |
1480 | case NFS3_CREATE_GUARDED: | |
1481 | err = nfserr_exist; | |
1482 | } | |
bad0dcff | 1483 | fh_drop_write(fhp); |
1da177e4 LT |
1484 | goto out; |
1485 | } | |
1486 | ||
6264d69d | 1487 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
463c3197 | 1488 | if (host_err < 0) { |
bad0dcff | 1489 | fh_drop_write(fhp); |
1da177e4 | 1490 | goto out_nfserr; |
463c3197 | 1491 | } |
81ac95c5 BF |
1492 | if (created) |
1493 | *created = 1; | |
1da177e4 | 1494 | |
4ac35c2f | 1495 | nfsd_check_ignore_resizing(iap); |
1496 | ||
ac6721a1 | 1497 | if (nfsd_create_is_exclusive(createmode)) { |
c397852c | 1498 | /* Cram the verifier into atime/mtime */ |
1da177e4 | 1499 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
c397852c | 1500 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
1da177e4 LT |
1501 | /* XXX someone who knows this better please fix it for nsec */ |
1502 | iap->ia_mtime.tv_sec = v_mtime; | |
1503 | iap->ia_atime.tv_sec = v_atime; | |
1504 | iap->ia_mtime.tv_nsec = 0; | |
1505 | iap->ia_atime.tv_nsec = 0; | |
1da177e4 LT |
1506 | } |
1507 | ||
1da177e4 | 1508 | set_attr: |
f501912a BM |
1509 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
1510 | ||
1511 | /* | |
1512 | * nfsd_setattr already committed the child (and possibly also the parent). | |
1513 | */ | |
1514 | if (!err) | |
1515 | err = nfserrno(commit_metadata(fhp)); | |
f193fbab | 1516 | |
bad0dcff | 1517 | fh_drop_write(fhp); |
f193fbab YT |
1518 | /* |
1519 | * Update the filehandle to get the new inode info. | |
1520 | */ | |
1521 | if (!err) | |
1522 | err = fh_update(resfhp); | |
1da177e4 LT |
1523 | |
1524 | out: | |
1525 | fh_unlock(fhp); | |
1526 | if (dchild && !IS_ERR(dchild)) | |
1527 | dput(dchild); | |
1528 | return err; | |
1529 | ||
1530 | out_nfserr: | |
6264d69d | 1531 | err = nfserrno(host_err); |
1da177e4 LT |
1532 | goto out; |
1533 | } | |
1534 | #endif /* CONFIG_NFSD_V3 */ | |
1535 | ||
1536 | /* | |
1537 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1538 | * fits into the buffer. On return, it contains the true length. | |
1539 | * N.B. After this call fhp needs an fh_put | |
1540 | */ | |
6264d69d | 1541 | __be32 |
1da177e4 LT |
1542 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1543 | { | |
1544 | struct dentry *dentry; | |
1545 | struct inode *inode; | |
1546 | mm_segment_t oldfs; | |
6264d69d AV |
1547 | __be32 err; |
1548 | int host_err; | |
1da177e4 | 1549 | |
8837abca | 1550 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
1da177e4 LT |
1551 | if (err) |
1552 | goto out; | |
1553 | ||
1554 | dentry = fhp->fh_dentry; | |
1555 | inode = dentry->d_inode; | |
1556 | ||
1557 | err = nfserr_inval; | |
acfa4380 | 1558 | if (!inode->i_op->readlink) |
1da177e4 LT |
1559 | goto out; |
1560 | ||
54775491 | 1561 | touch_atime(fhp->fh_export->ex_path.mnt, dentry); |
1da177e4 LT |
1562 | /* N.B. Why does this call need a get_fs()?? |
1563 | * Remove the set_fs and watch the fireworks:-) --okir | |
1564 | */ | |
1565 | ||
1566 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
6264d69d | 1567 | host_err = inode->i_op->readlink(dentry, buf, *lenp); |
1da177e4 LT |
1568 | set_fs(oldfs); |
1569 | ||
6264d69d | 1570 | if (host_err < 0) |
1da177e4 | 1571 | goto out_nfserr; |
6264d69d | 1572 | *lenp = host_err; |
1da177e4 LT |
1573 | err = 0; |
1574 | out: | |
1575 | return err; | |
1576 | ||
1577 | out_nfserr: | |
6264d69d | 1578 | err = nfserrno(host_err); |
1da177e4 LT |
1579 | goto out; |
1580 | } | |
1581 | ||
1582 | /* | |
1583 | * Create a symlink and look up its inode | |
1584 | * N.B. After this call _both_ fhp and resfhp need an fh_put | |
1585 | */ | |
6264d69d | 1586 | __be32 |
1da177e4 LT |
1587 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1588 | char *fname, int flen, | |
1589 | char *path, int plen, | |
1590 | struct svc_fh *resfhp, | |
1591 | struct iattr *iap) | |
1592 | { | |
1593 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1594 | __be32 err, cerr; |
1595 | int host_err; | |
1da177e4 LT |
1596 | |
1597 | err = nfserr_noent; | |
1598 | if (!flen || !plen) | |
1599 | goto out; | |
1600 | err = nfserr_exist; | |
1601 | if (isdotent(fname, flen)) | |
1602 | goto out; | |
1603 | ||
8837abca | 1604 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1605 | if (err) |
1606 | goto out; | |
1607 | fh_lock(fhp); | |
1608 | dentry = fhp->fh_dentry; | |
1609 | dnew = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1610 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1611 | if (IS_ERR(dnew)) |
1612 | goto out_nfserr; | |
1613 | ||
bad0dcff | 1614 | host_err = fh_want_write(fhp); |
75c3f29d DH |
1615 | if (host_err) |
1616 | goto out_nfserr; | |
1617 | ||
1da177e4 LT |
1618 | if (unlikely(path[plen] != 0)) { |
1619 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); | |
1620 | if (path_alloced == NULL) | |
6264d69d | 1621 | host_err = -ENOMEM; |
1da177e4 LT |
1622 | else { |
1623 | strncpy(path_alloced, path, plen); | |
1624 | path_alloced[plen] = 0; | |
db2e747b | 1625 | host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); |
1da177e4 LT |
1626 | kfree(path_alloced); |
1627 | } | |
1628 | } else | |
db2e747b | 1629 | host_err = vfs_symlink(dentry->d_inode, dnew, path); |
6264d69d | 1630 | err = nfserrno(host_err); |
f501912a BM |
1631 | if (!err) |
1632 | err = nfserrno(commit_metadata(fhp)); | |
1da177e4 LT |
1633 | fh_unlock(fhp); |
1634 | ||
bad0dcff | 1635 | fh_drop_write(fhp); |
75c3f29d | 1636 | |
1da177e4 LT |
1637 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
1638 | dput(dnew); | |
1639 | if (err==0) err = cerr; | |
1640 | out: | |
1641 | return err; | |
1642 | ||
1643 | out_nfserr: | |
6264d69d | 1644 | err = nfserrno(host_err); |
1da177e4 LT |
1645 | goto out; |
1646 | } | |
1647 | ||
1648 | /* | |
1649 | * Create a hardlink | |
1650 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1651 | */ | |
6264d69d | 1652 | __be32 |
1da177e4 LT |
1653 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1654 | char *name, int len, struct svc_fh *tfhp) | |
1655 | { | |
1656 | struct dentry *ddir, *dnew, *dold; | |
55b13354 | 1657 | struct inode *dirp; |
6264d69d AV |
1658 | __be32 err; |
1659 | int host_err; | |
1da177e4 | 1660 | |
8837abca | 1661 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1662 | if (err) |
1663 | goto out; | |
7d818a7b | 1664 | err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
1665 | if (err) |
1666 | goto out; | |
7d818a7b BF |
1667 | err = nfserr_isdir; |
1668 | if (S_ISDIR(tfhp->fh_dentry->d_inode->i_mode)) | |
1669 | goto out; | |
1da177e4 LT |
1670 | err = nfserr_perm; |
1671 | if (!len) | |
1672 | goto out; | |
1673 | err = nfserr_exist; | |
1674 | if (isdotent(name, len)) | |
1675 | goto out; | |
1676 | ||
12fd3520 | 1677 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
1da177e4 LT |
1678 | ddir = ffhp->fh_dentry; |
1679 | dirp = ddir->d_inode; | |
1680 | ||
1681 | dnew = lookup_one_len(name, ddir, len); | |
6264d69d | 1682 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1683 | if (IS_ERR(dnew)) |
1684 | goto out_nfserr; | |
1685 | ||
1686 | dold = tfhp->fh_dentry; | |
1da177e4 | 1687 | |
bad0dcff | 1688 | host_err = fh_want_write(tfhp); |
75c3f29d DH |
1689 | if (host_err) { |
1690 | err = nfserrno(host_err); | |
1691 | goto out_dput; | |
1692 | } | |
4795bb37 BF |
1693 | err = nfserr_noent; |
1694 | if (!dold->d_inode) | |
1695 | goto out_drop_write; | |
1696 | host_err = nfsd_break_lease(dold->d_inode); | |
7d751f6f CB |
1697 | if (host_err) { |
1698 | err = nfserrno(host_err); | |
4795bb37 | 1699 | goto out_drop_write; |
7d751f6f | 1700 | } |
6264d69d AV |
1701 | host_err = vfs_link(dold, dirp, dnew); |
1702 | if (!host_err) { | |
f501912a BM |
1703 | err = nfserrno(commit_metadata(ffhp)); |
1704 | if (!err) | |
1705 | err = nfserrno(commit_metadata(tfhp)); | |
1da177e4 | 1706 | } else { |
6264d69d | 1707 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1708 | err = nfserr_acces; |
1709 | else | |
6264d69d | 1710 | err = nfserrno(host_err); |
1da177e4 | 1711 | } |
4795bb37 | 1712 | out_drop_write: |
bad0dcff | 1713 | fh_drop_write(tfhp); |
75c3f29d | 1714 | out_dput: |
1da177e4 | 1715 | dput(dnew); |
270d56e5 DR |
1716 | out_unlock: |
1717 | fh_unlock(ffhp); | |
1da177e4 LT |
1718 | out: |
1719 | return err; | |
1720 | ||
1721 | out_nfserr: | |
6264d69d | 1722 | err = nfserrno(host_err); |
270d56e5 | 1723 | goto out_unlock; |
1da177e4 LT |
1724 | } |
1725 | ||
1726 | /* | |
1727 | * Rename a file | |
1728 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1729 | */ | |
6264d69d | 1730 | __be32 |
1da177e4 LT |
1731 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1732 | struct svc_fh *tfhp, char *tname, int tlen) | |
1733 | { | |
1734 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1735 | struct inode *fdir, *tdir; | |
6264d69d AV |
1736 | __be32 err; |
1737 | int host_err; | |
1da177e4 | 1738 | |
8837abca | 1739 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1740 | if (err) |
1741 | goto out; | |
8837abca | 1742 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1743 | if (err) |
1744 | goto out; | |
1745 | ||
1746 | fdentry = ffhp->fh_dentry; | |
1747 | fdir = fdentry->d_inode; | |
1748 | ||
1749 | tdentry = tfhp->fh_dentry; | |
1750 | tdir = tdentry->d_inode; | |
1751 | ||
1752 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; | |
a56f3937 | 1753 | if (ffhp->fh_export != tfhp->fh_export) |
1da177e4 LT |
1754 | goto out; |
1755 | ||
1756 | err = nfserr_perm; | |
1757 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1758 | goto out; | |
1759 | ||
1760 | /* cannot use fh_lock as we need deadlock protective ordering | |
1761 | * so do it by hand */ | |
1762 | trap = lock_rename(tdentry, fdentry); | |
1763 | ffhp->fh_locked = tfhp->fh_locked = 1; | |
1764 | fill_pre_wcc(ffhp); | |
1765 | fill_pre_wcc(tfhp); | |
1766 | ||
1767 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1768 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1769 | if (IS_ERR(odentry)) |
1770 | goto out_nfserr; | |
1771 | ||
6264d69d | 1772 | host_err = -ENOENT; |
1da177e4 LT |
1773 | if (!odentry->d_inode) |
1774 | goto out_dput_old; | |
6264d69d | 1775 | host_err = -EINVAL; |
1da177e4 LT |
1776 | if (odentry == trap) |
1777 | goto out_dput_old; | |
1778 | ||
1779 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1780 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1781 | if (IS_ERR(ndentry)) |
1782 | goto out_dput_old; | |
6264d69d | 1783 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1784 | if (ndentry == trap) |
1785 | goto out_dput_new; | |
1786 | ||
9079b1eb DH |
1787 | host_err = -EXDEV; |
1788 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) | |
1789 | goto out_dput_new; | |
bad0dcff | 1790 | host_err = fh_want_write(ffhp); |
9079b1eb DH |
1791 | if (host_err) |
1792 | goto out_dput_new; | |
1793 | ||
4795bb37 | 1794 | host_err = nfsd_break_lease(odentry->d_inode); |
83f6b0c1 BF |
1795 | if (host_err) |
1796 | goto out_drop_write; | |
1797 | if (ndentry->d_inode) { | |
1798 | host_err = nfsd_break_lease(ndentry->d_inode); | |
1799 | if (host_err) | |
1800 | goto out_drop_write; | |
1801 | } | |
6264d69d | 1802 | host_err = vfs_rename(fdir, odentry, tdir, ndentry); |
f501912a BM |
1803 | if (!host_err) { |
1804 | host_err = commit_metadata(tfhp); | |
6264d69d | 1805 | if (!host_err) |
f501912a | 1806 | host_err = commit_metadata(ffhp); |
1da177e4 | 1807 | } |
4795bb37 | 1808 | out_drop_write: |
bad0dcff | 1809 | fh_drop_write(ffhp); |
1da177e4 LT |
1810 | out_dput_new: |
1811 | dput(ndentry); | |
1812 | out_dput_old: | |
1813 | dput(odentry); | |
1814 | out_nfserr: | |
6264d69d | 1815 | err = nfserrno(host_err); |
1da177e4 LT |
1816 | |
1817 | /* we cannot reply on fh_unlock on the two filehandles, | |
1818 | * as that would do the wrong thing if the two directories | |
1819 | * were the same, so again we do it by hand | |
1820 | */ | |
1821 | fill_post_wcc(ffhp); | |
1822 | fill_post_wcc(tfhp); | |
1823 | unlock_rename(tdentry, fdentry); | |
1824 | ffhp->fh_locked = tfhp->fh_locked = 0; | |
1825 | ||
1826 | out: | |
1827 | return err; | |
1828 | } | |
1829 | ||
1830 | /* | |
1831 | * Unlink a file or directory | |
1832 | * N.B. After this call fhp needs an fh_put | |
1833 | */ | |
6264d69d | 1834 | __be32 |
1da177e4 LT |
1835 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1836 | char *fname, int flen) | |
1837 | { | |
1838 | struct dentry *dentry, *rdentry; | |
1839 | struct inode *dirp; | |
6264d69d AV |
1840 | __be32 err; |
1841 | int host_err; | |
1da177e4 LT |
1842 | |
1843 | err = nfserr_acces; | |
1844 | if (!flen || isdotent(fname, flen)) | |
1845 | goto out; | |
8837abca | 1846 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1847 | if (err) |
1848 | goto out; | |
1849 | ||
12fd3520 | 1850 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1851 | dentry = fhp->fh_dentry; |
1852 | dirp = dentry->d_inode; | |
1853 | ||
1854 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1855 | host_err = PTR_ERR(rdentry); |
1da177e4 LT |
1856 | if (IS_ERR(rdentry)) |
1857 | goto out_nfserr; | |
1858 | ||
1859 | if (!rdentry->d_inode) { | |
1860 | dput(rdentry); | |
1861 | err = nfserr_noent; | |
1862 | goto out; | |
1863 | } | |
1864 | ||
1865 | if (!type) | |
1866 | type = rdentry->d_inode->i_mode & S_IFMT; | |
1867 | ||
bad0dcff | 1868 | host_err = fh_want_write(fhp); |
0622753b | 1869 | if (host_err) |
541ce98c | 1870 | goto out_put; |
0622753b | 1871 | |
4795bb37 BF |
1872 | host_err = nfsd_break_lease(rdentry->d_inode); |
1873 | if (host_err) | |
541ce98c | 1874 | goto out_drop_write; |
9ce137ee | 1875 | if (type != S_IFDIR) |
6264d69d | 1876 | host_err = vfs_unlink(dirp, rdentry); |
9ce137ee | 1877 | else |
6264d69d | 1878 | host_err = vfs_rmdir(dirp, rdentry); |
f501912a BM |
1879 | if (!host_err) |
1880 | host_err = commit_metadata(fhp); | |
541ce98c | 1881 | out_drop_write: |
bad0dcff | 1882 | fh_drop_write(fhp); |
541ce98c BF |
1883 | out_put: |
1884 | dput(rdentry); | |
1885 | ||
1da177e4 | 1886 | out_nfserr: |
6264d69d | 1887 | err = nfserrno(host_err); |
f193fbab YT |
1888 | out: |
1889 | return err; | |
1da177e4 LT |
1890 | } |
1891 | ||
14f7dd63 DW |
1892 | /* |
1893 | * We do this buffering because we must not call back into the file | |
1894 | * system's ->lookup() method from the filldir callback. That may well | |
1895 | * deadlock a number of file systems. | |
1896 | * | |
1897 | * This is based heavily on the implementation of same in XFS. | |
1898 | */ | |
1899 | struct buffered_dirent { | |
1900 | u64 ino; | |
1901 | loff_t offset; | |
1902 | int namlen; | |
1903 | unsigned int d_type; | |
1904 | char name[]; | |
1905 | }; | |
1906 | ||
1907 | struct readdir_data { | |
1908 | char *dirent; | |
1909 | size_t used; | |
53c9c5c0 | 1910 | int full; |
14f7dd63 DW |
1911 | }; |
1912 | ||
1913 | static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, | |
1914 | loff_t offset, u64 ino, unsigned int d_type) | |
1915 | { | |
1916 | struct readdir_data *buf = __buf; | |
1917 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); | |
1918 | unsigned int reclen; | |
1919 | ||
1920 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); | |
53c9c5c0 AV |
1921 | if (buf->used + reclen > PAGE_SIZE) { |
1922 | buf->full = 1; | |
14f7dd63 | 1923 | return -EINVAL; |
53c9c5c0 | 1924 | } |
14f7dd63 DW |
1925 | |
1926 | de->namlen = namlen; | |
1927 | de->offset = offset; | |
1928 | de->ino = ino; | |
1929 | de->d_type = d_type; | |
1930 | memcpy(de->name, name, namlen); | |
1931 | buf->used += reclen; | |
1932 | ||
1933 | return 0; | |
1934 | } | |
1935 | ||
2f9092e1 DW |
1936 | static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, |
1937 | struct readdir_cd *cdp, loff_t *offsetp) | |
2628b766 | 1938 | { |
14f7dd63 DW |
1939 | struct readdir_data buf; |
1940 | struct buffered_dirent *de; | |
2628b766 | 1941 | int host_err; |
14f7dd63 DW |
1942 | int size; |
1943 | loff_t offset; | |
2628b766 | 1944 | |
14f7dd63 DW |
1945 | buf.dirent = (void *)__get_free_page(GFP_KERNEL); |
1946 | if (!buf.dirent) | |
2f9092e1 | 1947 | return nfserrno(-ENOMEM); |
14f7dd63 DW |
1948 | |
1949 | offset = *offsetp; | |
2628b766 | 1950 | |
14f7dd63 | 1951 | while (1) { |
2f9092e1 | 1952 | struct inode *dir_inode = file->f_path.dentry->d_inode; |
14f7dd63 DW |
1953 | unsigned int reclen; |
1954 | ||
b726e923 | 1955 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
14f7dd63 | 1956 | buf.used = 0; |
53c9c5c0 | 1957 | buf.full = 0; |
14f7dd63 DW |
1958 | |
1959 | host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); | |
53c9c5c0 AV |
1960 | if (buf.full) |
1961 | host_err = 0; | |
1962 | ||
1963 | if (host_err < 0) | |
14f7dd63 DW |
1964 | break; |
1965 | ||
1966 | size = buf.used; | |
1967 | ||
1968 | if (!size) | |
1969 | break; | |
1970 | ||
2f9092e1 DW |
1971 | /* |
1972 | * Various filldir functions may end up calling back into | |
1973 | * lookup_one_len() and the file system's ->lookup() method. | |
1974 | * These expect i_mutex to be held, as it would within readdir. | |
1975 | */ | |
1976 | host_err = mutex_lock_killable(&dir_inode->i_mutex); | |
1977 | if (host_err) | |
1978 | break; | |
1979 | ||
14f7dd63 DW |
1980 | de = (struct buffered_dirent *)buf.dirent; |
1981 | while (size > 0) { | |
1982 | offset = de->offset; | |
1983 | ||
1984 | if (func(cdp, de->name, de->namlen, de->offset, | |
1985 | de->ino, de->d_type)) | |
2f9092e1 | 1986 | break; |
14f7dd63 DW |
1987 | |
1988 | if (cdp->err != nfs_ok) | |
2f9092e1 | 1989 | break; |
14f7dd63 DW |
1990 | |
1991 | reclen = ALIGN(sizeof(*de) + de->namlen, | |
1992 | sizeof(u64)); | |
1993 | size -= reclen; | |
1994 | de = (struct buffered_dirent *)((char *)de + reclen); | |
1995 | } | |
2f9092e1 DW |
1996 | mutex_unlock(&dir_inode->i_mutex); |
1997 | if (size > 0) /* We bailed out early */ | |
1998 | break; | |
1999 | ||
c002a6c7 | 2000 | offset = vfs_llseek(file, 0, SEEK_CUR); |
14f7dd63 DW |
2001 | } |
2002 | ||
14f7dd63 | 2003 | free_page((unsigned long)(buf.dirent)); |
2628b766 DW |
2004 | |
2005 | if (host_err) | |
2006 | return nfserrno(host_err); | |
14f7dd63 DW |
2007 | |
2008 | *offsetp = offset; | |
2009 | return cdp->err; | |
2628b766 DW |
2010 | } |
2011 | ||
1da177e4 LT |
2012 | /* |
2013 | * Read entries from a directory. | |
2014 | * The NFSv3/4 verifier we ignore for now. | |
2015 | */ | |
6264d69d | 2016 | __be32 |
1da177e4 | 2017 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
a0ad13ef | 2018 | struct readdir_cd *cdp, filldir_t func) |
1da177e4 | 2019 | { |
6264d69d | 2020 | __be32 err; |
1da177e4 LT |
2021 | struct file *file; |
2022 | loff_t offset = *offsetp; | |
2023 | ||
8837abca | 2024 | err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); |
1da177e4 LT |
2025 | if (err) |
2026 | goto out; | |
2027 | ||
2028 | offset = vfs_llseek(file, offset, 0); | |
2029 | if (offset < 0) { | |
2030 | err = nfserrno((int)offset); | |
2031 | goto out_close; | |
2032 | } | |
2033 | ||
14f7dd63 | 2034 | err = nfsd_buffered_readdir(file, func, cdp, offsetp); |
1da177e4 LT |
2035 | |
2036 | if (err == nfserr_eof || err == nfserr_toosmall) | |
2037 | err = nfs_ok; /* can still be found in ->err */ | |
2038 | out_close: | |
2039 | nfsd_close(file); | |
2040 | out: | |
2041 | return err; | |
2042 | } | |
2043 | ||
2044 | /* | |
2045 | * Get file system stats | |
2046 | * N.B. After this call fhp needs an fh_put | |
2047 | */ | |
6264d69d | 2048 | __be32 |
04716e66 | 2049 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) |
1da177e4 | 2050 | { |
ebabe9a9 CH |
2051 | __be32 err; |
2052 | ||
2053 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); | |
f6360efb TI |
2054 | if (!err) { |
2055 | struct path path = { | |
2056 | .mnt = fhp->fh_export->ex_path.mnt, | |
2057 | .dentry = fhp->fh_dentry, | |
2058 | }; | |
2059 | if (vfs_statfs(&path, stat)) | |
2060 | err = nfserr_io; | |
2061 | } | |
1da177e4 LT |
2062 | return err; |
2063 | } | |
2064 | ||
c7d51402 | 2065 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
e22841c6 | 2066 | { |
c7d51402 | 2067 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
e22841c6 BF |
2068 | } |
2069 | ||
1da177e4 LT |
2070 | /* |
2071 | * Check for a user's access permissions to this inode. | |
2072 | */ | |
6264d69d | 2073 | __be32 |
0ec757df BF |
2074 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
2075 | struct dentry *dentry, int acc) | |
1da177e4 LT |
2076 | { |
2077 | struct inode *inode = dentry->d_inode; | |
2078 | int err; | |
2079 | ||
aea93397 | 2080 | if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) |
1da177e4 LT |
2081 | return 0; |
2082 | #if 0 | |
2083 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
2084 | acc, | |
8837abca MS |
2085 | (acc & NFSD_MAY_READ)? " read" : "", |
2086 | (acc & NFSD_MAY_WRITE)? " write" : "", | |
2087 | (acc & NFSD_MAY_EXEC)? " exec" : "", | |
2088 | (acc & NFSD_MAY_SATTR)? " sattr" : "", | |
2089 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", | |
2090 | (acc & NFSD_MAY_LOCK)? " lock" : "", | |
2091 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1da177e4 LT |
2092 | inode->i_mode, |
2093 | IS_IMMUTABLE(inode)? " immut" : "", | |
2094 | IS_APPEND(inode)? " append" : "", | |
2c463e95 | 2095 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
1da177e4 | 2096 | dprintk(" owner %d/%d user %d/%d\n", |
5cc0a840 | 2097 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
1da177e4 LT |
2098 | #endif |
2099 | ||
2100 | /* Normally we reject any write/sattr etc access on a read-only file | |
2101 | * system. But if it is IRIX doing check on write-access for a | |
2102 | * device special file, we ignore rofs. | |
2103 | */ | |
8837abca MS |
2104 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
2105 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { | |
2c463e95 DH |
2106 | if (exp_rdonly(rqstp, exp) || |
2107 | __mnt_is_readonly(exp->ex_path.mnt)) | |
1da177e4 | 2108 | return nfserr_rofs; |
8837abca | 2109 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
1da177e4 LT |
2110 | return nfserr_perm; |
2111 | } | |
8837abca | 2112 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
1da177e4 LT |
2113 | return nfserr_perm; |
2114 | ||
8837abca | 2115 | if (acc & NFSD_MAY_LOCK) { |
1da177e4 LT |
2116 | /* If we cannot rely on authentication in NLM requests, |
2117 | * just allow locks, otherwise require read permission, or | |
2118 | * ownership | |
2119 | */ | |
2120 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
2121 | return 0; | |
2122 | else | |
8837abca | 2123 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
1da177e4 LT |
2124 | } |
2125 | /* | |
2126 | * The file owner always gets access permission for accesses that | |
2127 | * would normally be checked at open time. This is to make | |
2128 | * file access work even when the client has done a fchmod(fd, 0). | |
2129 | * | |
2130 | * However, `cp foo bar' should fail nevertheless when bar is | |
2131 | * readonly. A sensible way to do this might be to reject all | |
2132 | * attempts to truncate a read-only file, because a creat() call | |
2133 | * always implies file truncation. | |
2134 | * ... but this isn't really fair. A process may reasonably call | |
2135 | * ftruncate on an open file descriptor on a file with perm 000. | |
2136 | * We must trust the client to do permission checking - using "ACCESS" | |
2137 | * with NFSv3. | |
2138 | */ | |
8837abca | 2139 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
5cc0a840 | 2140 | inode->i_uid == current_fsuid()) |
1da177e4 LT |
2141 | return 0; |
2142 | ||
8837abca | 2143 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
f419a2e3 | 2144 | err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); |
1da177e4 LT |
2145 | |
2146 | /* Allow read access to binaries even when mode 111 */ | |
2147 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
a043226b BF |
2148 | (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || |
2149 | acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) | |
f419a2e3 | 2150 | err = inode_permission(inode, MAY_EXEC); |
1da177e4 LT |
2151 | |
2152 | return err? nfserrno(err) : 0; | |
2153 | } | |
2154 | ||
2155 | void | |
2156 | nfsd_racache_shutdown(void) | |
2157 | { | |
54a66e54 JL |
2158 | struct raparms *raparm, *last_raparm; |
2159 | unsigned int i; | |
2160 | ||
1da177e4 | 2161 | dprintk("nfsd: freeing readahead buffers.\n"); |
54a66e54 JL |
2162 | |
2163 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { | |
2164 | raparm = raparm_hash[i].pb_head; | |
2165 | while(raparm) { | |
2166 | last_raparm = raparm; | |
2167 | raparm = raparm->p_next; | |
2168 | kfree(last_raparm); | |
2169 | } | |
2170 | raparm_hash[i].pb_head = NULL; | |
2171 | } | |
1da177e4 LT |
2172 | } |
2173 | /* | |
2174 | * Initialize readahead param cache | |
2175 | */ | |
2176 | int | |
2177 | nfsd_racache_init(int cache_size) | |
2178 | { | |
2179 | int i; | |
fce1456a GB |
2180 | int j = 0; |
2181 | int nperbucket; | |
54a66e54 | 2182 | struct raparms **raparm = NULL; |
1da177e4 | 2183 | |
fce1456a | 2184 | |
54a66e54 | 2185 | if (raparm_hash[0].pb_head) |
1da177e4 | 2186 | return 0; |
54a66e54 JL |
2187 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
2188 | if (nperbucket < 2) | |
2189 | nperbucket = 2; | |
2190 | cache_size = nperbucket * RAPARM_HASH_SIZE; | |
4b3bb06b YB |
2191 | |
2192 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); | |
54a66e54 JL |
2193 | |
2194 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { | |
4b3bb06b | 2195 | spin_lock_init(&raparm_hash[i].pb_lock); |
54a66e54 JL |
2196 | |
2197 | raparm = &raparm_hash[i].pb_head; | |
2198 | for (j = 0; j < nperbucket; j++) { | |
2199 | *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); | |
2200 | if (!*raparm) | |
2201 | goto out_nomem; | |
2202 | raparm = &(*raparm)->p_next; | |
2203 | } | |
2204 | *raparm = NULL; | |
4b3bb06b YB |
2205 | } |
2206 | ||
1da177e4 LT |
2207 | nfsdstats.ra_size = cache_size; |
2208 | return 0; | |
54a66e54 JL |
2209 | |
2210 | out_nomem: | |
2211 | dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); | |
2212 | nfsd_racache_shutdown(); | |
2213 | return -ENOMEM; | |
1da177e4 | 2214 | } |
a257cdd0 AG |
2215 | |
2216 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
2217 | struct posix_acl * | |
2218 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) | |
2219 | { | |
2220 | struct inode *inode = fhp->fh_dentry->d_inode; | |
2221 | char *name; | |
2222 | void *value = NULL; | |
2223 | ssize_t size; | |
2224 | struct posix_acl *acl; | |
2225 | ||
5be196e5 CH |
2226 | if (!IS_POSIXACL(inode)) |
2227 | return ERR_PTR(-EOPNOTSUPP); | |
2228 | ||
2229 | switch (type) { | |
2230 | case ACL_TYPE_ACCESS: | |
2231 | name = POSIX_ACL_XATTR_ACCESS; | |
2232 | break; | |
2233 | case ACL_TYPE_DEFAULT: | |
2234 | name = POSIX_ACL_XATTR_DEFAULT; | |
2235 | break; | |
2236 | default: | |
a257cdd0 | 2237 | return ERR_PTR(-EOPNOTSUPP); |
a257cdd0 AG |
2238 | } |
2239 | ||
5be196e5 CH |
2240 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
2241 | if (size < 0) | |
2242 | return ERR_PTR(size); | |
a257cdd0 | 2243 | |
a257cdd0 | 2244 | acl = posix_acl_from_xattr(value, size); |
a257cdd0 AG |
2245 | kfree(value); |
2246 | return acl; | |
2247 | } | |
2248 | ||
2249 | int | |
2250 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) | |
2251 | { | |
2252 | struct inode *inode = fhp->fh_dentry->d_inode; | |
2253 | char *name; | |
2254 | void *value = NULL; | |
2255 | size_t size; | |
2256 | int error; | |
2257 | ||
acfa4380 | 2258 | if (!IS_POSIXACL(inode) || |
a257cdd0 AG |
2259 | !inode->i_op->setxattr || !inode->i_op->removexattr) |
2260 | return -EOPNOTSUPP; | |
2261 | switch(type) { | |
2262 | case ACL_TYPE_ACCESS: | |
334a13ec | 2263 | name = POSIX_ACL_XATTR_ACCESS; |
a257cdd0 AG |
2264 | break; |
2265 | case ACL_TYPE_DEFAULT: | |
334a13ec | 2266 | name = POSIX_ACL_XATTR_DEFAULT; |
a257cdd0 AG |
2267 | break; |
2268 | default: | |
2269 | return -EOPNOTSUPP; | |
2270 | } | |
2271 | ||
2272 | if (acl && acl->a_count) { | |
334a13ec | 2273 | size = posix_acl_xattr_size(acl->a_count); |
a257cdd0 AG |
2274 | value = kmalloc(size, GFP_KERNEL); |
2275 | if (!value) | |
2276 | return -ENOMEM; | |
9ccfc29c FM |
2277 | error = posix_acl_to_xattr(acl, value, size); |
2278 | if (error < 0) | |
a257cdd0 | 2279 | goto getout; |
9ccfc29c | 2280 | size = error; |
a257cdd0 AG |
2281 | } else |
2282 | size = 0; | |
2283 | ||
bad0dcff | 2284 | error = fh_want_write(fhp); |
18f335af DH |
2285 | if (error) |
2286 | goto getout; | |
a257cdd0 | 2287 | if (size) |
5be196e5 | 2288 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
a257cdd0 AG |
2289 | else { |
2290 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) | |
2291 | error = 0; | |
2292 | else { | |
5be196e5 | 2293 | error = vfs_removexattr(fhp->fh_dentry, name); |
a257cdd0 AG |
2294 | if (error == -ENODATA) |
2295 | error = 0; | |
2296 | } | |
2297 | } | |
bad0dcff | 2298 | fh_drop_write(fhp); |
a257cdd0 AG |
2299 | |
2300 | getout: | |
2301 | kfree(value); | |
2302 | return error; | |
2303 | } | |
2304 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |