Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #define MSNFS /* HACK HACK */ |
2 | /* | |
1da177e4 LT |
3 | * File operations used by nfsd. Some of these have been ripped from |
4 | * other parts of the kernel because they weren't exported, others | |
5 | * are partial duplicates with added or changed functionality. | |
6 | * | |
7 | * Note that several functions dget() the dentry upon which they want | |
8 | * to act, most notably those that create directory entries. Response | |
9 | * dentry's are dput()'d if necessary in the release callback. | |
10 | * So if you notice code paths that apparently fail to dput() the | |
11 | * dentry, don't worry--they have been taken care of. | |
12 | * | |
13 | * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> | |
14 | * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/fs.h> |
18 | #include <linux/file.h> | |
d6b29d7c | 19 | #include <linux/splice.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> | |
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 |
1da177e4 LT |
37 | #include <linux/nfs4_acl.h> |
38 | #include <linux/nfsd_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 | |
9393bd07 | 90 | while (d_mountpoint(path.dentry) && follow_down(&path)) |
91c9fa8f | 91 | ; |
1da177e4 | 92 | |
91c9fa8f | 93 | exp2 = rqst_exp_get_by_name(rqstp, &path); |
1da177e4 | 94 | if (IS_ERR(exp2)) { |
3b6cee7b BF |
95 | err = PTR_ERR(exp2); |
96 | /* | |
97 | * We normally allow NFS clients to continue | |
98 | * "underneath" a mountpoint that is not exported. | |
99 | * The exception is V4ROOT, where no traversal is ever | |
100 | * allowed without an explicit export of the new | |
101 | * directory. | |
102 | */ | |
103 | if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) | |
104 | err = 0; | |
91c9fa8f | 105 | path_put(&path); |
1da177e4 LT |
106 | goto out; |
107 | } | |
3c394dda SD |
108 | if (nfsd_v4client(rqstp) || |
109 | (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { | |
1da177e4 | 110 | /* successfully crossed mount point */ |
1644ccc8 | 111 | /* |
91c9fa8f AV |
112 | * This is subtle: path.dentry is *not* on path.mnt |
113 | * at this point. The only reason we are safe is that | |
114 | * original mnt is pinned down by exp, so we should | |
115 | * put path *before* putting exp | |
1644ccc8 | 116 | */ |
91c9fa8f AV |
117 | *dpp = path.dentry; |
118 | path.dentry = dentry; | |
1644ccc8 | 119 | *expp = exp2; |
91c9fa8f | 120 | exp2 = exp; |
1da177e4 | 121 | } |
91c9fa8f AV |
122 | path_put(&path); |
123 | exp_put(exp2); | |
1da177e4 LT |
124 | out: |
125 | return err; | |
126 | } | |
127 | ||
289ede45 BF |
128 | static void follow_to_parent(struct path *path) |
129 | { | |
130 | struct dentry *dp; | |
131 | ||
132 | while (path->dentry == path->mnt->mnt_root && follow_up(path)) | |
133 | ; | |
134 | dp = dget_parent(path->dentry); | |
135 | dput(path->dentry); | |
136 | path->dentry = dp; | |
137 | } | |
138 | ||
139 | static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) | |
140 | { | |
141 | struct svc_export *exp2; | |
142 | struct path path = {.mnt = mntget((*exp)->ex_path.mnt), | |
143 | .dentry = dget(dparent)}; | |
144 | ||
145 | follow_to_parent(&path); | |
146 | ||
147 | exp2 = rqst_exp_parent(rqstp, &path); | |
148 | if (PTR_ERR(exp2) == -ENOENT) { | |
149 | *dentryp = dget(dparent); | |
150 | } else if (IS_ERR(exp2)) { | |
151 | path_put(&path); | |
152 | return PTR_ERR(exp2); | |
153 | } else { | |
154 | *dentryp = dget(path.dentry); | |
155 | exp_put(*exp); | |
156 | *exp = exp2; | |
157 | } | |
158 | path_put(&path); | |
159 | return 0; | |
160 | } | |
161 | ||
82ead7fe BF |
162 | /* |
163 | * For nfsd purposes, we treat V4ROOT exports as though there was an | |
164 | * export at *every* directory. | |
165 | */ | |
3227fa41 | 166 | int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) |
82ead7fe BF |
167 | { |
168 | if (d_mountpoint(dentry)) | |
169 | return 1; | |
170 | if (!(exp->ex_flags & NFSEXP_V4ROOT)) | |
171 | return 0; | |
172 | return dentry->d_inode != NULL; | |
173 | } | |
174 | ||
6264d69d | 175 | __be32 |
6c0a654d | 176 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
5a022fc8 | 177 | const char *name, unsigned int len, |
6c0a654d | 178 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
1da177e4 LT |
179 | { |
180 | struct svc_export *exp; | |
181 | struct dentry *dparent; | |
182 | struct dentry *dentry; | |
6264d69d AV |
183 | __be32 err; |
184 | int host_err; | |
1da177e4 LT |
185 | |
186 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); | |
187 | ||
188 | /* Obtain dentry and export. */ | |
8837abca | 189 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
1da177e4 LT |
190 | if (err) |
191 | return err; | |
192 | ||
193 | dparent = fhp->fh_dentry; | |
194 | exp = fhp->fh_export; | |
195 | exp_get(exp); | |
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 { | |
212 | fh_lock(fhp); | |
213 | dentry = lookup_one_len(name, dparent, len); | |
6264d69d | 214 | host_err = PTR_ERR(dentry); |
1da177e4 LT |
215 | if (IS_ERR(dentry)) |
216 | goto out_nfserr; | |
217 | /* | |
218 | * check if we have crossed a mount point ... | |
219 | */ | |
82ead7fe | 220 | if (nfsd_mountpoint(dentry, exp)) { |
6264d69d | 221 | if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
1da177e4 LT |
222 | dput(dentry); |
223 | goto out_nfserr; | |
224 | } | |
225 | } | |
226 | } | |
6c0a654d BF |
227 | *dentry_ret = dentry; |
228 | *exp_ret = exp; | |
229 | return 0; | |
230 | ||
231 | out_nfserr: | |
232 | exp_put(exp); | |
233 | return nfserrno(host_err); | |
234 | } | |
235 | ||
236 | /* | |
237 | * Look up one component of a pathname. | |
238 | * N.B. After this call _both_ fhp and resfh need an fh_put | |
239 | * | |
240 | * If the lookup would cross a mountpoint, and the mounted filesystem | |
241 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is | |
242 | * accepted as it stands and the mounted directory is | |
243 | * returned. Otherwise the covered directory is returned. | |
244 | * NOTE: this mountpoint crossing is not supported properly by all | |
245 | * clients and is explicitly disallowed for NFSv3 | |
246 | * NeilBrown <neilb@cse.unsw.edu.au> | |
247 | */ | |
248 | __be32 | |
249 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, | |
5a022fc8 | 250 | unsigned int len, struct svc_fh *resfh) |
6c0a654d BF |
251 | { |
252 | struct svc_export *exp; | |
253 | struct dentry *dentry; | |
254 | __be32 err; | |
255 | ||
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 | ||
f501912a BM |
275 | /* |
276 | * Commit metadata changes to stable storage. | |
277 | */ | |
278 | static int | |
279 | commit_metadata(struct svc_fh *fhp) | |
280 | { | |
281 | struct inode *inode = fhp->fh_dentry->d_inode; | |
282 | const struct export_operations *export_ops = inode->i_sb->s_export_op; | |
283 | int error = 0; | |
284 | ||
285 | if (!EX_ISSYNC(fhp->fh_export)) | |
286 | return 0; | |
287 | ||
288 | if (export_ops->commit_metadata) { | |
289 | error = export_ops->commit_metadata(inode); | |
290 | } else { | |
291 | struct writeback_control wbc = { | |
292 | .sync_mode = WB_SYNC_ALL, | |
293 | .nr_to_write = 0, /* metadata only */ | |
294 | }; | |
295 | ||
296 | error = sync_inode(inode, &wbc); | |
297 | } | |
298 | ||
299 | return error; | |
300 | } | |
6c0a654d | 301 | |
1da177e4 LT |
302 | /* |
303 | * Set various file attributes. | |
304 | * N.B. After this call fhp needs an fh_put | |
305 | */ | |
6264d69d | 306 | __be32 |
1da177e4 LT |
307 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, |
308 | int check_guard, time_t guardtime) | |
309 | { | |
310 | struct dentry *dentry; | |
311 | struct inode *inode; | |
8837abca | 312 | int accmode = NFSD_MAY_SATTR; |
1da177e4 | 313 | int ftype = 0; |
6264d69d AV |
314 | __be32 err; |
315 | int host_err; | |
1da177e4 LT |
316 | int size_change = 0; |
317 | ||
318 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) | |
8837abca | 319 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; |
1da177e4 LT |
320 | if (iap->ia_valid & ATTR_SIZE) |
321 | ftype = S_IFREG; | |
322 | ||
323 | /* Get inode */ | |
324 | err = fh_verify(rqstp, fhp, ftype, accmode); | |
15b7a1b8 | 325 | if (err) |
1da177e4 LT |
326 | goto out; |
327 | ||
328 | dentry = fhp->fh_dentry; | |
329 | inode = dentry->d_inode; | |
330 | ||
15b7a1b8 N |
331 | /* Ignore any mode updates on symlinks */ |
332 | if (S_ISLNK(inode->i_mode)) | |
333 | iap->ia_valid &= ~ATTR_MODE; | |
334 | ||
335 | if (!iap->ia_valid) | |
336 | goto out; | |
337 | ||
9c85fca5 CH |
338 | /* |
339 | * NFSv2 does not differentiate between "set-[ac]time-to-now" | |
1da177e4 LT |
340 | * which only requires access, and "set-[ac]time-to-X" which |
341 | * requires ownership. | |
342 | * So if it looks like it might be "set both to the same time which | |
343 | * is close to now", and if inode_change_ok fails, then we | |
344 | * convert to "set to now" instead of "set to explicit time" | |
345 | * | |
346 | * We only call inode_change_ok as the last test as technically | |
347 | * it is not an interface that we should be using. It is only | |
348 | * valid if the filesystem does not define it's own i_op->setattr. | |
349 | */ | |
350 | #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) | |
351 | #define MAX_TOUCH_TIME_ERROR (30*60) | |
9c85fca5 CH |
352 | if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && |
353 | iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { | |
354 | /* | |
355 | * Looks probable. | |
356 | * | |
357 | * Now just make sure time is in the right ballpark. | |
358 | * Solaris, at least, doesn't seem to care what the time | |
359 | * request is. We require it be within 30 minutes of now. | |
1da177e4 | 360 | */ |
9c85fca5 CH |
361 | time_t delta = iap->ia_atime.tv_sec - get_seconds(); |
362 | if (delta < 0) | |
363 | delta = -delta; | |
364 | if (delta < MAX_TOUCH_TIME_ERROR && | |
365 | inode_change_ok(inode, iap) != 0) { | |
366 | /* | |
367 | * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. | |
368 | * This will cause notify_change to set these times | |
369 | * to "now" | |
370 | */ | |
371 | iap->ia_valid &= ~BOTH_TIME_SET; | |
372 | } | |
1da177e4 LT |
373 | } |
374 | ||
9c85fca5 CH |
375 | /* |
376 | * The size case is special. | |
377 | * It changes the file as well as the attributes. | |
378 | */ | |
1da177e4 LT |
379 | if (iap->ia_valid & ATTR_SIZE) { |
380 | if (iap->ia_size < inode->i_size) { | |
8837abca MS |
381 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, |
382 | NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE); | |
1da177e4 LT |
383 | if (err) |
384 | goto out; | |
385 | } | |
386 | ||
387 | /* | |
388 | * If we are changing the size of the file, then | |
389 | * we need to break all leases. | |
390 | */ | |
8737c930 | 391 | host_err = break_lease(inode, O_WRONLY | O_NONBLOCK); |
6264d69d AV |
392 | if (host_err == -EWOULDBLOCK) |
393 | host_err = -ETIMEDOUT; | |
394 | if (host_err) /* ENOMEM or EWOULDBLOCK */ | |
1da177e4 LT |
395 | goto out_nfserr; |
396 | ||
6264d69d AV |
397 | host_err = get_write_access(inode); |
398 | if (host_err) | |
1da177e4 LT |
399 | goto out_nfserr; |
400 | ||
401 | size_change = 1; | |
6264d69d AV |
402 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); |
403 | if (host_err) { | |
1da177e4 LT |
404 | put_write_access(inode); |
405 | goto out_nfserr; | |
406 | } | |
1da177e4 LT |
407 | } |
408 | ||
ca456252 | 409 | /* sanitize the mode change */ |
1da177e4 LT |
410 | if (iap->ia_valid & ATTR_MODE) { |
411 | iap->ia_mode &= S_IALLUGO; | |
dee3209d | 412 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
ca456252 JL |
413 | } |
414 | ||
415 | /* Revoke setuid/setgid on chown */ | |
0953e620 SP |
416 | if (!S_ISDIR(inode->i_mode) && |
417 | (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) || | |
418 | ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid))) { | |
ca456252 JL |
419 | iap->ia_valid |= ATTR_KILL_PRIV; |
420 | if (iap->ia_valid & ATTR_MODE) { | |
421 | /* we're setting mode too, just clear the s*id bits */ | |
8a0ce7d9 | 422 | iap->ia_mode &= ~S_ISUID; |
ca456252 JL |
423 | if (iap->ia_mode & S_IXGRP) |
424 | iap->ia_mode &= ~S_ISGID; | |
425 | } else { | |
426 | /* set ATTR_KILL_* bits and let VFS handle it */ | |
427 | iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); | |
8a0ce7d9 | 428 | } |
1da177e4 LT |
429 | } |
430 | ||
1da177e4 LT |
431 | /* Change the attributes. */ |
432 | ||
433 | iap->ia_valid |= ATTR_CTIME; | |
434 | ||
435 | err = nfserr_notsync; | |
436 | if (!check_guard || guardtime == inode->i_ctime.tv_sec) { | |
437 | fh_lock(fhp); | |
6264d69d AV |
438 | host_err = notify_change(dentry, iap); |
439 | err = nfserrno(host_err); | |
1da177e4 LT |
440 | fh_unlock(fhp); |
441 | } | |
442 | if (size_change) | |
443 | put_write_access(inode); | |
444 | if (!err) | |
445 | if (EX_ISSYNC(fhp->fh_export)) | |
446 | write_inode_now(inode, 1); | |
447 | out: | |
448 | return err; | |
449 | ||
450 | out_nfserr: | |
6264d69d | 451 | err = nfserrno(host_err); |
1da177e4 LT |
452 | goto out; |
453 | } | |
454 | ||
5be196e5 CH |
455 | #if defined(CONFIG_NFSD_V2_ACL) || \ |
456 | defined(CONFIG_NFSD_V3_ACL) || \ | |
457 | defined(CONFIG_NFSD_V4) | |
458 | static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) | |
459 | { | |
460 | ssize_t buflen; | |
6c6a426f | 461 | ssize_t ret; |
5be196e5 CH |
462 | |
463 | buflen = vfs_getxattr(dentry, key, NULL, 0); | |
464 | if (buflen <= 0) | |
465 | return buflen; | |
1da177e4 | 466 | |
5be196e5 CH |
467 | *buf = kmalloc(buflen, GFP_KERNEL); |
468 | if (!*buf) | |
469 | return -ENOMEM; | |
470 | ||
6c6a426f KK |
471 | ret = vfs_getxattr(dentry, key, *buf, buflen); |
472 | if (ret < 0) | |
473 | kfree(*buf); | |
474 | return ret; | |
5be196e5 CH |
475 | } |
476 | #endif | |
477 | ||
478 | #if defined(CONFIG_NFSD_V4) | |
1da177e4 LT |
479 | static int |
480 | set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) | |
481 | { | |
482 | int len; | |
483 | size_t buflen; | |
484 | char *buf = NULL; | |
485 | int error = 0; | |
1da177e4 LT |
486 | |
487 | buflen = posix_acl_xattr_size(pacl->a_count); | |
488 | buf = kmalloc(buflen, GFP_KERNEL); | |
489 | error = -ENOMEM; | |
490 | if (buf == NULL) | |
491 | goto out; | |
492 | ||
493 | len = posix_acl_to_xattr(pacl, buf, buflen); | |
494 | if (len < 0) { | |
495 | error = len; | |
496 | goto out; | |
497 | } | |
498 | ||
5be196e5 | 499 | error = vfs_setxattr(dentry, key, buf, len, 0); |
1da177e4 LT |
500 | out: |
501 | kfree(buf); | |
502 | return error; | |
503 | } | |
504 | ||
6264d69d | 505 | __be32 |
1da177e4 LT |
506 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
507 | struct nfs4_acl *acl) | |
508 | { | |
6264d69d AV |
509 | __be32 error; |
510 | int host_error; | |
1da177e4 LT |
511 | struct dentry *dentry; |
512 | struct inode *inode; | |
513 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
514 | unsigned int flags = 0; | |
515 | ||
516 | /* Get inode */ | |
8837abca | 517 | error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, NFSD_MAY_SATTR); |
1da177e4 | 518 | if (error) |
4b2ca38a | 519 | return error; |
1da177e4 LT |
520 | |
521 | dentry = fhp->fh_dentry; | |
522 | inode = dentry->d_inode; | |
523 | if (S_ISDIR(inode->i_mode)) | |
524 | flags = NFS4_ACL_DIR; | |
525 | ||
6264d69d AV |
526 | host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
527 | if (host_error == -EINVAL) { | |
4b2ca38a | 528 | return nfserr_attrnotsupp; |
6264d69d | 529 | } else if (host_error < 0) |
1da177e4 LT |
530 | goto out_nfserr; |
531 | ||
6264d69d AV |
532 | host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); |
533 | if (host_error < 0) | |
4b2ca38a | 534 | goto out_release; |
1da177e4 | 535 | |
4b2ca38a | 536 | if (S_ISDIR(inode->i_mode)) |
6264d69d | 537 | host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); |
1da177e4 | 538 | |
4b2ca38a | 539 | out_release: |
1da177e4 LT |
540 | posix_acl_release(pacl); |
541 | posix_acl_release(dpacl); | |
1da177e4 | 542 | out_nfserr: |
f34f9242 | 543 | if (host_error == -EOPNOTSUPP) |
4b2ca38a | 544 | return nfserr_attrnotsupp; |
f34f9242 | 545 | else |
4b2ca38a | 546 | return nfserrno(host_error); |
1da177e4 LT |
547 | } |
548 | ||
549 | static struct posix_acl * | |
550 | _get_posix_acl(struct dentry *dentry, char *key) | |
551 | { | |
5be196e5 | 552 | void *buf = NULL; |
1da177e4 | 553 | struct posix_acl *pacl = NULL; |
5be196e5 | 554 | int buflen; |
1da177e4 | 555 | |
5be196e5 CH |
556 | buflen = nfsd_getxattr(dentry, key, &buf); |
557 | if (!buflen) | |
558 | buflen = -ENODATA; | |
559 | if (buflen <= 0) | |
560 | return ERR_PTR(buflen); | |
1da177e4 LT |
561 | |
562 | pacl = posix_acl_from_xattr(buf, buflen); | |
1da177e4 LT |
563 | kfree(buf); |
564 | return pacl; | |
1da177e4 LT |
565 | } |
566 | ||
567 | int | |
568 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) | |
569 | { | |
570 | struct inode *inode = dentry->d_inode; | |
571 | int error = 0; | |
572 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
573 | unsigned int flags = 0; | |
574 | ||
9a59f452 | 575 | pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); |
1da177e4 LT |
576 | if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) |
577 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); | |
578 | if (IS_ERR(pacl)) { | |
579 | error = PTR_ERR(pacl); | |
580 | pacl = NULL; | |
581 | goto out; | |
582 | } | |
583 | ||
584 | if (S_ISDIR(inode->i_mode)) { | |
9a59f452 | 585 | dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); |
1da177e4 LT |
586 | if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) |
587 | dpacl = NULL; | |
588 | else if (IS_ERR(dpacl)) { | |
589 | error = PTR_ERR(dpacl); | |
590 | dpacl = NULL; | |
591 | goto out; | |
592 | } | |
593 | flags = NFS4_ACL_DIR; | |
594 | } | |
595 | ||
596 | *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); | |
597 | if (IS_ERR(*acl)) { | |
598 | error = PTR_ERR(*acl); | |
599 | *acl = NULL; | |
600 | } | |
601 | out: | |
602 | posix_acl_release(pacl); | |
603 | posix_acl_release(dpacl); | |
604 | return error; | |
605 | } | |
606 | ||
607 | #endif /* defined(CONFIG_NFS_V4) */ | |
608 | ||
609 | #ifdef CONFIG_NFSD_V3 | |
610 | /* | |
611 | * Check server access rights to a file system object | |
612 | */ | |
613 | struct accessmap { | |
614 | u32 access; | |
615 | int how; | |
616 | }; | |
617 | static struct accessmap nfs3_regaccess[] = { | |
8837abca MS |
618 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
619 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
620 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, | |
621 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, | |
1da177e4 LT |
622 | |
623 | { 0, 0 } | |
624 | }; | |
625 | ||
626 | static struct accessmap nfs3_diraccess[] = { | |
8837abca MS |
627 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
628 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, | |
629 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, | |
630 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, | |
631 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, | |
1da177e4 LT |
632 | |
633 | { 0, 0 } | |
634 | }; | |
635 | ||
636 | static struct accessmap nfs3_anyaccess[] = { | |
637 | /* Some clients - Solaris 2.6 at least, make an access call | |
638 | * to the server to check for access for things like /dev/null | |
639 | * (which really, the server doesn't care about). So | |
640 | * We provide simple access checking for them, looking | |
641 | * mainly at mode bits, and we make sure to ignore read-only | |
642 | * filesystem checks | |
643 | */ | |
8837abca MS |
644 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
645 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
646 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
647 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
1da177e4 LT |
648 | |
649 | { 0, 0 } | |
650 | }; | |
651 | ||
6264d69d | 652 | __be32 |
1da177e4 LT |
653 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
654 | { | |
655 | struct accessmap *map; | |
656 | struct svc_export *export; | |
657 | struct dentry *dentry; | |
658 | u32 query, result = 0, sresult = 0; | |
6264d69d | 659 | __be32 error; |
1da177e4 | 660 | |
8837abca | 661 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
662 | if (error) |
663 | goto out; | |
664 | ||
665 | export = fhp->fh_export; | |
666 | dentry = fhp->fh_dentry; | |
667 | ||
668 | if (S_ISREG(dentry->d_inode->i_mode)) | |
669 | map = nfs3_regaccess; | |
670 | else if (S_ISDIR(dentry->d_inode->i_mode)) | |
671 | map = nfs3_diraccess; | |
672 | else | |
673 | map = nfs3_anyaccess; | |
674 | ||
675 | ||
676 | query = *access; | |
677 | for (; map->access; map++) { | |
678 | if (map->access & query) { | |
6264d69d | 679 | __be32 err2; |
1da177e4 LT |
680 | |
681 | sresult |= map->access; | |
682 | ||
0ec757df | 683 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
1da177e4 LT |
684 | switch (err2) { |
685 | case nfs_ok: | |
686 | result |= map->access; | |
687 | break; | |
688 | ||
689 | /* the following error codes just mean the access was not allowed, | |
690 | * rather than an error occurred */ | |
691 | case nfserr_rofs: | |
692 | case nfserr_acces: | |
693 | case nfserr_perm: | |
694 | /* simply don't "or" in the access bit. */ | |
695 | break; | |
696 | default: | |
697 | error = err2; | |
698 | goto out; | |
699 | } | |
700 | } | |
701 | } | |
702 | *access = result; | |
703 | if (supported) | |
704 | *supported = sresult; | |
705 | ||
706 | out: | |
707 | return error; | |
708 | } | |
709 | #endif /* CONFIG_NFSD_V3 */ | |
710 | ||
711 | ||
712 | ||
713 | /* | |
714 | * Open an existing file or directory. | |
715 | * The access argument indicates the type of open (read/write/lock) | |
716 | * N.B. After this call fhp needs an fh_put | |
717 | */ | |
6264d69d | 718 | __be32 |
1da177e4 LT |
719 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
720 | int access, struct file **filp) | |
721 | { | |
722 | struct dentry *dentry; | |
723 | struct inode *inode; | |
6264d69d AV |
724 | int flags = O_RDONLY|O_LARGEFILE; |
725 | __be32 err; | |
726 | int host_err; | |
1da177e4 | 727 | |
e0e81739 DH |
728 | validate_process_creds(); |
729 | ||
1da177e4 LT |
730 | /* |
731 | * If we get here, then the client has already done an "open", | |
732 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE | |
733 | * in case a chmod has now revoked permission. | |
734 | */ | |
8837abca | 735 | err = fh_verify(rqstp, fhp, type, access | NFSD_MAY_OWNER_OVERRIDE); |
1da177e4 LT |
736 | if (err) |
737 | goto out; | |
738 | ||
739 | dentry = fhp->fh_dentry; | |
740 | inode = dentry->d_inode; | |
741 | ||
742 | /* Disallow write access to files with the append-only bit set | |
743 | * or any access when mandatory locking enabled | |
744 | */ | |
745 | err = nfserr_perm; | |
8837abca | 746 | if (IS_APPEND(inode) && (access & NFSD_MAY_WRITE)) |
1da177e4 | 747 | goto out; |
5e7fc436 BF |
748 | /* |
749 | * We must ignore files (but only files) which might have mandatory | |
750 | * locks on them because there is no way to know if the accesser has | |
751 | * the lock. | |
752 | */ | |
753 | if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) | |
1da177e4 LT |
754 | goto out; |
755 | ||
756 | if (!inode->i_fop) | |
757 | goto out; | |
758 | ||
759 | /* | |
760 | * Check to see if there are any leases on this file. | |
761 | * This may block while leases are broken. | |
762 | */ | |
8737c930 | 763 | host_err = break_lease(inode, O_NONBLOCK | ((access & NFSD_MAY_WRITE) ? O_WRONLY : 0)); |
6264d69d AV |
764 | if (host_err == -EWOULDBLOCK) |
765 | host_err = -ETIMEDOUT; | |
766 | if (host_err) /* NOMEM or WOULDBLOCK */ | |
1da177e4 LT |
767 | goto out_nfserr; |
768 | ||
8837abca MS |
769 | if (access & NFSD_MAY_WRITE) { |
770 | if (access & NFSD_MAY_READ) | |
9ecb6a08 BF |
771 | flags = O_RDWR|O_LARGEFILE; |
772 | else | |
773 | flags = O_WRONLY|O_LARGEFILE; | |
1da177e4 | 774 | } |
54775491 | 775 | *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), |
033a666c | 776 | flags, current_cred()); |
1da177e4 | 777 | if (IS_ERR(*filp)) |
6264d69d | 778 | host_err = PTR_ERR(*filp); |
aeaa5ccd CE |
779 | else |
780 | host_err = ima_file_check(*filp, access); | |
1da177e4 | 781 | out_nfserr: |
6264d69d | 782 | err = nfserrno(host_err); |
1da177e4 | 783 | out: |
e0e81739 | 784 | validate_process_creds(); |
1da177e4 LT |
785 | return err; |
786 | } | |
787 | ||
788 | /* | |
789 | * Close a file. | |
790 | */ | |
791 | void | |
792 | nfsd_close(struct file *filp) | |
793 | { | |
794 | fput(filp); | |
795 | } | |
796 | ||
1da177e4 LT |
797 | /* |
798 | * Obtain the readahead parameters for the file | |
799 | * specified by (dev, ino). | |
800 | */ | |
1da177e4 LT |
801 | |
802 | static inline struct raparms * | |
803 | nfsd_get_raparms(dev_t dev, ino_t ino) | |
804 | { | |
805 | struct raparms *ra, **rap, **frap = NULL; | |
806 | int depth = 0; | |
fce1456a GB |
807 | unsigned int hash; |
808 | struct raparm_hbucket *rab; | |
809 | ||
810 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; | |
811 | rab = &raparm_hash[hash]; | |
1da177e4 | 812 | |
fce1456a GB |
813 | spin_lock(&rab->pb_lock); |
814 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { | |
1da177e4 LT |
815 | if (ra->p_ino == ino && ra->p_dev == dev) |
816 | goto found; | |
817 | depth++; | |
818 | if (ra->p_count == 0) | |
819 | frap = rap; | |
820 | } | |
821 | depth = nfsdstats.ra_size*11/10; | |
822 | if (!frap) { | |
fce1456a | 823 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
824 | return NULL; |
825 | } | |
826 | rap = frap; | |
827 | ra = *frap; | |
828 | ra->p_dev = dev; | |
829 | ra->p_ino = ino; | |
830 | ra->p_set = 0; | |
fce1456a | 831 | ra->p_hindex = hash; |
1da177e4 | 832 | found: |
fce1456a | 833 | if (rap != &rab->pb_head) { |
1da177e4 | 834 | *rap = ra->p_next; |
fce1456a GB |
835 | ra->p_next = rab->pb_head; |
836 | rab->pb_head = ra; | |
1da177e4 LT |
837 | } |
838 | ra->p_count++; | |
839 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; | |
fce1456a | 840 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
841 | return ra; |
842 | } | |
843 | ||
844 | /* | |
cf8208d0 JA |
845 | * Grab and keep cached pages associated with a file in the svc_rqst |
846 | * so that they can be passed to the network sendmsg/sendpage routines | |
847 | * directly. They will be released after the sending has completed. | |
1da177e4 LT |
848 | */ |
849 | static int | |
cf8208d0 JA |
850 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
851 | struct splice_desc *sd) | |
1da177e4 | 852 | { |
cf8208d0 | 853 | struct svc_rqst *rqstp = sd->u.data; |
44524359 | 854 | struct page **pp = rqstp->rq_respages + rqstp->rq_resused; |
cf8208d0 JA |
855 | struct page *page = buf->page; |
856 | size_t size; | |
857 | int ret; | |
1da177e4 | 858 | |
cac36bb0 | 859 | ret = buf->ops->confirm(pipe, buf); |
cf8208d0 JA |
860 | if (unlikely(ret)) |
861 | return ret; | |
862 | ||
863 | size = sd->len; | |
1da177e4 LT |
864 | |
865 | if (rqstp->rq_res.page_len == 0) { | |
866 | get_page(page); | |
44524359 N |
867 | put_page(*pp); |
868 | *pp = page; | |
869 | rqstp->rq_resused++; | |
cf8208d0 | 870 | rqstp->rq_res.page_base = buf->offset; |
1da177e4 | 871 | rqstp->rq_res.page_len = size; |
44524359 | 872 | } else if (page != pp[-1]) { |
1da177e4 | 873 | get_page(page); |
250f3915 N |
874 | if (*pp) |
875 | put_page(*pp); | |
44524359 N |
876 | *pp = page; |
877 | rqstp->rq_resused++; | |
1da177e4 | 878 | rqstp->rq_res.page_len += size; |
44524359 | 879 | } else |
1da177e4 | 880 | rqstp->rq_res.page_len += size; |
1da177e4 | 881 | |
1da177e4 LT |
882 | return size; |
883 | } | |
884 | ||
cf8208d0 JA |
885 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
886 | struct splice_desc *sd) | |
887 | { | |
888 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
889 | } | |
890 | ||
a8754bee DH |
891 | static inline int svc_msnfs(struct svc_fh *ffhp) |
892 | { | |
893 | #ifdef MSNFS | |
894 | return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS); | |
895 | #else | |
896 | return 0; | |
897 | #endif | |
898 | } | |
899 | ||
6264d69d | 900 | static __be32 |
1da177e4 LT |
901 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
902 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) | |
903 | { | |
904 | struct inode *inode; | |
905 | struct raparms *ra; | |
906 | mm_segment_t oldfs; | |
6264d69d AV |
907 | __be32 err; |
908 | int host_err; | |
1da177e4 LT |
909 | |
910 | err = nfserr_perm; | |
7eaa36e2 | 911 | inode = file->f_path.dentry->d_inode; |
a8754bee DH |
912 | |
913 | if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count)) | |
1da177e4 | 914 | goto out; |
1da177e4 LT |
915 | |
916 | /* Get readahead parameters */ | |
917 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); | |
918 | ||
919 | if (ra && ra->p_set) | |
920 | file->f_ra = ra->p_ra; | |
921 | ||
cf8208d0 JA |
922 | if (file->f_op->splice_read && rqstp->rq_splice_ok) { |
923 | struct splice_desc sd = { | |
924 | .len = 0, | |
925 | .total_len = *count, | |
926 | .pos = offset, | |
927 | .u.data = rqstp, | |
928 | }; | |
929 | ||
4fbef206 | 930 | rqstp->rq_resused = 1; |
cf8208d0 | 931 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
1da177e4 LT |
932 | } else { |
933 | oldfs = get_fs(); | |
934 | set_fs(KERNEL_DS); | |
6264d69d | 935 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
1da177e4 LT |
936 | set_fs(oldfs); |
937 | } | |
938 | ||
939 | /* Write back readahead params */ | |
940 | if (ra) { | |
fce1456a GB |
941 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; |
942 | spin_lock(&rab->pb_lock); | |
1da177e4 LT |
943 | ra->p_ra = file->f_ra; |
944 | ra->p_set = 1; | |
945 | ra->p_count--; | |
fce1456a | 946 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
947 | } |
948 | ||
6264d69d AV |
949 | if (host_err >= 0) { |
950 | nfsdstats.io_read += host_err; | |
951 | *count = host_err; | |
1da177e4 | 952 | err = 0; |
7eaa36e2 | 953 | fsnotify_access(file->f_path.dentry); |
1da177e4 | 954 | } else |
6264d69d | 955 | err = nfserrno(host_err); |
1da177e4 LT |
956 | out: |
957 | return err; | |
958 | } | |
959 | ||
9f708e40 NB |
960 | static void kill_suid(struct dentry *dentry) |
961 | { | |
962 | struct iattr ia; | |
b5376771 | 963 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; |
9f708e40 | 964 | |
1b1dcc1b | 965 | mutex_lock(&dentry->d_inode->i_mutex); |
9f708e40 | 966 | notify_change(dentry, &ia); |
1b1dcc1b | 967 | mutex_unlock(&dentry->d_inode->i_mutex); |
9f708e40 NB |
968 | } |
969 | ||
d911df7b BF |
970 | /* |
971 | * Gathered writes: If another process is currently writing to the file, | |
972 | * there's a high chance this is another nfsd (triggered by a bulk write | |
973 | * from a client's biod). Rather than syncing the file with each write | |
974 | * request, we sleep for 10 msec. | |
975 | * | |
976 | * I don't know if this roughly approximates C. Juszak's idea of | |
977 | * gathered writes, but it's a nice and simple solution (IMHO), and it | |
978 | * seems to work:-) | |
979 | * | |
980 | * Note: we do this only in the NFSv2 case, since v3 and higher have a | |
981 | * better tool (separate unstable writes and commits) for solving this | |
982 | * problem. | |
983 | */ | |
984 | static int wait_for_concurrent_writes(struct file *file) | |
985 | { | |
986 | struct inode *inode = file->f_path.dentry->d_inode; | |
987 | static ino_t last_ino; | |
988 | static dev_t last_dev; | |
989 | int err = 0; | |
990 | ||
991 | if (atomic_read(&inode->i_writecount) > 1 | |
992 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
993 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); | |
994 | msleep(10); | |
995 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); | |
996 | } | |
997 | ||
998 | if (inode->i_state & I_DIRTY) { | |
999 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); | |
6a68f89e | 1000 | err = vfs_fsync(file, file->f_path.dentry, 0); |
d911df7b BF |
1001 | } |
1002 | last_ino = inode->i_ino; | |
1003 | last_dev = inode->i_sb->s_dev; | |
1004 | return err; | |
1005 | } | |
1006 | ||
6264d69d | 1007 | static __be32 |
1da177e4 LT |
1008 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1009 | loff_t offset, struct kvec *vec, int vlen, | |
31dec253 | 1010 | unsigned long *cnt, int *stablep) |
1da177e4 LT |
1011 | { |
1012 | struct svc_export *exp; | |
1013 | struct dentry *dentry; | |
1014 | struct inode *inode; | |
1015 | mm_segment_t oldfs; | |
6264d69d AV |
1016 | __be32 err = 0; |
1017 | int host_err; | |
1da177e4 | 1018 | int stable = *stablep; |
48e03bc5 | 1019 | int use_wgather; |
1da177e4 | 1020 | |
45bd3b3d | 1021 | #ifdef MSNFS |
1da177e4 LT |
1022 | err = nfserr_perm; |
1023 | ||
1da177e4 | 1024 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
31dec253 | 1025 | (!lock_may_write(file->f_path.dentry->d_inode, offset, *cnt))) |
1da177e4 LT |
1026 | goto out; |
1027 | #endif | |
1028 | ||
7eaa36e2 | 1029 | dentry = file->f_path.dentry; |
1da177e4 LT |
1030 | inode = dentry->d_inode; |
1031 | exp = fhp->fh_export; | |
1032 | ||
1033 | /* | |
1034 | * Request sync writes if | |
1035 | * - the sync export option has been set, or | |
1036 | * - the client requested O_SYNC behavior (NFSv3 feature). | |
1037 | * - The file system doesn't support fsync(). | |
48e03bc5 | 1038 | * When NFSv2 gathered writes have been configured for this volume, |
1da177e4 LT |
1039 | * flushing the data to disk is handled separately below. |
1040 | */ | |
48e03bc5 | 1041 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
1da177e4 | 1042 | |
3ba15148 | 1043 | if (!file->f_op->fsync) {/* COMMIT3 cannot work */ |
1da177e4 LT |
1044 | stable = 2; |
1045 | *stablep = 2; /* FILE_SYNC */ | |
1046 | } | |
1047 | ||
1048 | if (!EX_ISSYNC(exp)) | |
1049 | stable = 0; | |
48e03bc5 | 1050 | if (stable && !use_wgather) { |
db1dd4d3 | 1051 | spin_lock(&file->f_lock); |
1da177e4 | 1052 | file->f_flags |= O_SYNC; |
db1dd4d3 JC |
1053 | spin_unlock(&file->f_lock); |
1054 | } | |
1da177e4 LT |
1055 | |
1056 | /* Write the data. */ | |
1057 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
6264d69d | 1058 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); |
1da177e4 | 1059 | set_fs(oldfs); |
e4636d53 BF |
1060 | if (host_err < 0) |
1061 | goto out_nfserr; | |
1062 | *cnt = host_err; | |
1063 | nfsdstats.io_write += host_err; | |
1064 | fsnotify_modify(file->f_path.dentry); | |
1da177e4 LT |
1065 | |
1066 | /* clear setuid/setgid flag after write */ | |
e4636d53 | 1067 | if (inode->i_mode & (S_ISUID | S_ISGID)) |
9f708e40 | 1068 | kill_suid(dentry); |
1da177e4 | 1069 | |
e4636d53 | 1070 | if (stable && use_wgather) |
d911df7b | 1071 | host_err = wait_for_concurrent_writes(file); |
1da177e4 | 1072 | |
e4636d53 | 1073 | out_nfserr: |
6264d69d | 1074 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
a0d24b29 | 1075 | if (host_err >= 0) |
1da177e4 | 1076 | err = 0; |
a0d24b29 | 1077 | else |
6264d69d | 1078 | err = nfserrno(host_err); |
1da177e4 LT |
1079 | out: |
1080 | return err; | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * Read data from a file. count must contain the requested read count | |
1085 | * on entry. On return, *count contains the number of bytes actually read. | |
1086 | * N.B. After this call fhp needs an fh_put | |
1087 | */ | |
6264d69d | 1088 | __be32 |
1da177e4 LT |
1089 | nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1090 | loff_t offset, struct kvec *vec, int vlen, | |
1091 | unsigned long *count) | |
1092 | { | |
6264d69d | 1093 | __be32 err; |
1da177e4 LT |
1094 | |
1095 | if (file) { | |
0ec757df | 1096 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
8837abca | 1097 | NFSD_MAY_READ|NFSD_MAY_OWNER_OVERRIDE); |
1da177e4 LT |
1098 | if (err) |
1099 | goto out; | |
1100 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
1101 | } else { | |
8837abca | 1102 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file); |
1da177e4 LT |
1103 | if (err) |
1104 | goto out; | |
1105 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
1106 | nfsd_close(file); | |
1107 | } | |
1108 | out: | |
1109 | return err; | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * Write data to a file. | |
1114 | * The stable flag requests synchronous writes. | |
1115 | * N.B. After this call fhp needs an fh_put | |
1116 | */ | |
6264d69d | 1117 | __be32 |
1da177e4 | 1118 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
31dec253 | 1119 | loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt, |
1da177e4 LT |
1120 | int *stablep) |
1121 | { | |
6264d69d | 1122 | __be32 err = 0; |
1da177e4 LT |
1123 | |
1124 | if (file) { | |
0ec757df | 1125 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
8837abca | 1126 | NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE); |
1da177e4 LT |
1127 | if (err) |
1128 | goto out; | |
1129 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, | |
1130 | stablep); | |
1131 | } else { | |
8837abca | 1132 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
1da177e4 LT |
1133 | if (err) |
1134 | goto out; | |
1135 | ||
1136 | if (cnt) | |
1137 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, | |
1138 | cnt, stablep); | |
1139 | nfsd_close(file); | |
1140 | } | |
1141 | out: | |
1142 | return err; | |
1143 | } | |
1144 | ||
1145 | #ifdef CONFIG_NFSD_V3 | |
1146 | /* | |
1147 | * Commit all pending writes to stable storage. | |
aa696a6f TM |
1148 | * |
1149 | * Note: we only guarantee that data that lies within the range specified | |
1150 | * by the 'offset' and 'count' parameters will be synced. | |
1da177e4 LT |
1151 | * |
1152 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1153 | * data to the client, as locking happens lower down in the filesystem. | |
1154 | */ | |
6264d69d | 1155 | __be32 |
1da177e4 LT |
1156 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1157 | loff_t offset, unsigned long count) | |
1158 | { | |
1159 | struct file *file; | |
aa696a6f TM |
1160 | loff_t end = LLONG_MAX; |
1161 | __be32 err = nfserr_inval; | |
1da177e4 | 1162 | |
aa696a6f TM |
1163 | if (offset < 0) |
1164 | goto out; | |
1165 | if (count != 0) { | |
1166 | end = offset + (loff_t)count - 1; | |
1167 | if (end < offset) | |
1168 | goto out; | |
1169 | } | |
1da177e4 | 1170 | |
8837abca MS |
1171 | err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file); |
1172 | if (err) | |
aa696a6f | 1173 | goto out; |
1da177e4 | 1174 | if (EX_ISSYNC(fhp->fh_export)) { |
aa696a6f TM |
1175 | int err2 = vfs_fsync_range(file, file->f_path.dentry, |
1176 | offset, end, 0); | |
1177 | ||
1178 | if (err2 != -EINVAL) | |
1179 | err = nfserrno(err2); | |
1180 | else | |
1da177e4 | 1181 | err = nfserr_notsupp; |
1da177e4 LT |
1182 | } |
1183 | ||
1184 | nfsd_close(file); | |
aa696a6f | 1185 | out: |
1da177e4 LT |
1186 | return err; |
1187 | } | |
1188 | #endif /* CONFIG_NFSD_V3 */ | |
1189 | ||
f2b0dee2 | 1190 | static __be32 |
5c002b3b BF |
1191 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, |
1192 | struct iattr *iap) | |
1193 | { | |
1194 | /* | |
1195 | * Mode has already been set earlier in create: | |
1196 | */ | |
1197 | iap->ia_valid &= ~ATTR_MODE; | |
1198 | /* | |
1199 | * Setting uid/gid works only for root. Irix appears to | |
1200 | * send along the gid on create when it tries to implement | |
1201 | * setgid directories via NFS: | |
1202 | */ | |
5cc0a840 | 1203 | if (current_fsuid() != 0) |
5c002b3b BF |
1204 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
1205 | if (iap->ia_valid) | |
1206 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); | |
1207 | return 0; | |
1208 | } | |
1209 | ||
4ac35c2f | 1210 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
1211 | * setting size to 0 may fail for some specific file systems by the permission | |
1212 | * checking which requires WRITE permission but the mode is 000. | |
1213 | * we ignore the resizing(to 0) on the just new created file, since the size is | |
1214 | * 0 after file created. | |
1215 | * | |
1216 | * call this only after vfs_create() is called. | |
1217 | * */ | |
1218 | static void | |
1219 | nfsd_check_ignore_resizing(struct iattr *iap) | |
1220 | { | |
1221 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) | |
1222 | iap->ia_valid &= ~ATTR_SIZE; | |
1223 | } | |
1224 | ||
1da177e4 LT |
1225 | /* |
1226 | * Create a file (regular, directory, device, fifo); UNIX sockets | |
1227 | * not yet implemented. | |
1228 | * If the response fh has been verified, the parent directory should | |
1229 | * already be locked. Note that the parent directory is left locked. | |
1230 | * | |
1231 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1232 | */ | |
6264d69d | 1233 | __be32 |
1da177e4 LT |
1234 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1235 | char *fname, int flen, struct iattr *iap, | |
1236 | int type, dev_t rdev, struct svc_fh *resfhp) | |
1237 | { | |
1238 | struct dentry *dentry, *dchild = NULL; | |
1239 | struct inode *dirp; | |
6264d69d | 1240 | __be32 err; |
5c002b3b | 1241 | __be32 err2; |
6264d69d | 1242 | int host_err; |
1da177e4 LT |
1243 | |
1244 | err = nfserr_perm; | |
1245 | if (!flen) | |
1246 | goto out; | |
1247 | err = nfserr_exist; | |
1248 | if (isdotent(fname, flen)) | |
1249 | goto out; | |
1250 | ||
8837abca | 1251 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1252 | if (err) |
1253 | goto out; | |
1254 | ||
1255 | dentry = fhp->fh_dentry; | |
1256 | dirp = dentry->d_inode; | |
1257 | ||
1258 | err = nfserr_notdir; | |
acfa4380 | 1259 | if (!dirp->i_op->lookup) |
1da177e4 LT |
1260 | goto out; |
1261 | /* | |
1262 | * Check whether the response file handle has been verified yet. | |
1263 | * If it has, the parent directory should already be locked. | |
1264 | */ | |
1265 | if (!resfhp->fh_dentry) { | |
1266 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ | |
12fd3520 | 1267 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 | 1268 | dchild = lookup_one_len(fname, dentry, flen); |
6264d69d | 1269 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1270 | if (IS_ERR(dchild)) |
1271 | goto out_nfserr; | |
1272 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
1273 | if (err) | |
1274 | goto out; | |
1275 | } else { | |
1276 | /* called from nfsd_proc_create */ | |
1277 | dchild = dget(resfhp->fh_dentry); | |
1278 | if (!fhp->fh_locked) { | |
1279 | /* not actually possible */ | |
1280 | printk(KERN_ERR | |
1281 | "nfsd_create: parent %s/%s not locked!\n", | |
1282 | dentry->d_parent->d_name.name, | |
1283 | dentry->d_name.name); | |
d75f2b9f | 1284 | err = nfserr_io; |
1da177e4 LT |
1285 | goto out; |
1286 | } | |
1287 | } | |
1288 | /* | |
1289 | * Make sure the child dentry is still negative ... | |
1290 | */ | |
1291 | err = nfserr_exist; | |
1292 | if (dchild->d_inode) { | |
1293 | dprintk("nfsd_create: dentry %s/%s not negative!\n", | |
1294 | dentry->d_name.name, dchild->d_name.name); | |
1295 | goto out; | |
1296 | } | |
1297 | ||
1298 | if (!(iap->ia_valid & ATTR_MODE)) | |
1299 | iap->ia_mode = 0; | |
1300 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1301 | ||
07cad1d2 MS |
1302 | err = nfserr_inval; |
1303 | if (!S_ISREG(type) && !S_ISDIR(type) && !special_file(type)) { | |
1304 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", | |
1305 | type); | |
1306 | goto out; | |
1307 | } | |
1308 | ||
1309 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); | |
1310 | if (host_err) | |
1311 | goto out_nfserr; | |
1312 | ||
1da177e4 LT |
1313 | /* |
1314 | * Get the dir op function pointer. | |
1315 | */ | |
088406bc | 1316 | err = 0; |
1da177e4 LT |
1317 | switch (type) { |
1318 | case S_IFREG: | |
6264d69d | 1319 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
4ac35c2f | 1320 | if (!host_err) |
1321 | nfsd_check_ignore_resizing(iap); | |
1da177e4 LT |
1322 | break; |
1323 | case S_IFDIR: | |
6264d69d | 1324 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
1da177e4 LT |
1325 | break; |
1326 | case S_IFCHR: | |
1327 | case S_IFBLK: | |
1328 | case S_IFIFO: | |
1329 | case S_IFSOCK: | |
6264d69d | 1330 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
1da177e4 | 1331 | break; |
1da177e4 | 1332 | } |
463c3197 DH |
1333 | if (host_err < 0) { |
1334 | mnt_drop_write(fhp->fh_export->ex_path.mnt); | |
1da177e4 | 1335 | goto out_nfserr; |
463c3197 | 1336 | } |
1da177e4 | 1337 | |
f501912a | 1338 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
1da177e4 | 1339 | |
f501912a BM |
1340 | /* |
1341 | * nfsd_setattr already committed the child. Transactional filesystems | |
1342 | * had a chance to commit changes for both parent and child | |
1343 | * simultaneously making the following commit_metadata a noop. | |
1344 | */ | |
1345 | err2 = nfserrno(commit_metadata(fhp)); | |
5c002b3b BF |
1346 | if (err2) |
1347 | err = err2; | |
463c3197 | 1348 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
1da177e4 LT |
1349 | /* |
1350 | * Update the file handle to get the new inode info. | |
1351 | */ | |
1352 | if (!err) | |
1353 | err = fh_update(resfhp); | |
1354 | out: | |
1355 | if (dchild && !IS_ERR(dchild)) | |
1356 | dput(dchild); | |
1357 | return err; | |
1358 | ||
1359 | out_nfserr: | |
6264d69d | 1360 | err = nfserrno(host_err); |
1da177e4 LT |
1361 | goto out; |
1362 | } | |
1363 | ||
1364 | #ifdef CONFIG_NFSD_V3 | |
1365 | /* | |
1366 | * NFSv3 version of nfsd_create | |
1367 | */ | |
6264d69d | 1368 | __be32 |
1da177e4 LT |
1369 | nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1370 | char *fname, int flen, struct iattr *iap, | |
1371 | struct svc_fh *resfhp, int createmode, u32 *verifier, | |
81ac95c5 | 1372 | int *truncp, int *created) |
1da177e4 LT |
1373 | { |
1374 | struct dentry *dentry, *dchild = NULL; | |
1375 | struct inode *dirp; | |
6264d69d AV |
1376 | __be32 err; |
1377 | int host_err; | |
1da177e4 | 1378 | __u32 v_mtime=0, v_atime=0; |
1da177e4 LT |
1379 | |
1380 | err = nfserr_perm; | |
1381 | if (!flen) | |
1382 | goto out; | |
1383 | err = nfserr_exist; | |
1384 | if (isdotent(fname, flen)) | |
1385 | goto out; | |
1386 | if (!(iap->ia_valid & ATTR_MODE)) | |
1387 | iap->ia_mode = 0; | |
8837abca | 1388 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1389 | if (err) |
1390 | goto out; | |
1391 | ||
1392 | dentry = fhp->fh_dentry; | |
1393 | dirp = dentry->d_inode; | |
1394 | ||
1395 | /* Get all the sanity checks out of the way before | |
1396 | * we lock the parent. */ | |
1397 | err = nfserr_notdir; | |
acfa4380 | 1398 | if (!dirp->i_op->lookup) |
1da177e4 | 1399 | goto out; |
12fd3520 | 1400 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1401 | |
1402 | /* | |
1403 | * Compose the response file handle. | |
1404 | */ | |
1405 | dchild = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1406 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1407 | if (IS_ERR(dchild)) |
1408 | goto out_nfserr; | |
1409 | ||
1410 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
1411 | if (err) | |
1412 | goto out; | |
1413 | ||
1414 | if (createmode == NFS3_CREATE_EXCLUSIVE) { | |
c397852c | 1415 | /* solaris7 gets confused (bugid 4218508) if these have |
749997e5 JL |
1416 | * the high bit set, so just clear the high bits. If this is |
1417 | * ever changed to use different attrs for storing the | |
1418 | * verifier, then do_open_lookup() will also need to be fixed | |
1419 | * accordingly. | |
1da177e4 LT |
1420 | */ |
1421 | v_mtime = verifier[0]&0x7fffffff; | |
1422 | v_atime = verifier[1]&0x7fffffff; | |
1da177e4 LT |
1423 | } |
1424 | ||
463c3197 DH |
1425 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
1426 | if (host_err) | |
1427 | goto out_nfserr; | |
1da177e4 LT |
1428 | if (dchild->d_inode) { |
1429 | err = 0; | |
1430 | ||
1431 | switch (createmode) { | |
1432 | case NFS3_CREATE_UNCHECKED: | |
1433 | if (! S_ISREG(dchild->d_inode->i_mode)) | |
1434 | err = nfserr_exist; | |
1435 | else if (truncp) { | |
1436 | /* in nfsv4, we need to treat this case a little | |
1437 | * differently. we don't want to truncate the | |
1438 | * file now; this would be wrong if the OPEN | |
1439 | * fails for some other reason. furthermore, | |
1440 | * if the size is nonzero, we should ignore it | |
1441 | * according to spec! | |
1442 | */ | |
1443 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; | |
1444 | } | |
1445 | else { | |
1446 | iap->ia_valid &= ATTR_SIZE; | |
1447 | goto set_attr; | |
1448 | } | |
1449 | break; | |
1450 | case NFS3_CREATE_EXCLUSIVE: | |
1451 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime | |
1452 | && dchild->d_inode->i_atime.tv_sec == v_atime | |
1da177e4 LT |
1453 | && dchild->d_inode->i_size == 0 ) |
1454 | break; | |
1455 | /* fallthru */ | |
1456 | case NFS3_CREATE_GUARDED: | |
1457 | err = nfserr_exist; | |
1458 | } | |
463c3197 | 1459 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
1da177e4 LT |
1460 | goto out; |
1461 | } | |
1462 | ||
6264d69d | 1463 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
463c3197 DH |
1464 | if (host_err < 0) { |
1465 | mnt_drop_write(fhp->fh_export->ex_path.mnt); | |
1da177e4 | 1466 | goto out_nfserr; |
463c3197 | 1467 | } |
81ac95c5 BF |
1468 | if (created) |
1469 | *created = 1; | |
1da177e4 | 1470 | |
4ac35c2f | 1471 | nfsd_check_ignore_resizing(iap); |
1472 | ||
1da177e4 | 1473 | if (createmode == NFS3_CREATE_EXCLUSIVE) { |
c397852c | 1474 | /* Cram the verifier into atime/mtime */ |
1da177e4 | 1475 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
c397852c | 1476 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
1da177e4 LT |
1477 | /* XXX someone who knows this better please fix it for nsec */ |
1478 | iap->ia_mtime.tv_sec = v_mtime; | |
1479 | iap->ia_atime.tv_sec = v_atime; | |
1480 | iap->ia_mtime.tv_nsec = 0; | |
1481 | iap->ia_atime.tv_nsec = 0; | |
1da177e4 LT |
1482 | } |
1483 | ||
1da177e4 | 1484 | set_attr: |
f501912a BM |
1485 | err = nfsd_create_setattr(rqstp, resfhp, iap); |
1486 | ||
1487 | /* | |
1488 | * nfsd_setattr already committed the child (and possibly also the parent). | |
1489 | */ | |
1490 | if (!err) | |
1491 | err = nfserrno(commit_metadata(fhp)); | |
f193fbab | 1492 | |
463c3197 | 1493 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
f193fbab YT |
1494 | /* |
1495 | * Update the filehandle to get the new inode info. | |
1496 | */ | |
1497 | if (!err) | |
1498 | err = fh_update(resfhp); | |
1da177e4 LT |
1499 | |
1500 | out: | |
1501 | fh_unlock(fhp); | |
1502 | if (dchild && !IS_ERR(dchild)) | |
1503 | dput(dchild); | |
1504 | return err; | |
1505 | ||
1506 | out_nfserr: | |
6264d69d | 1507 | err = nfserrno(host_err); |
1da177e4 LT |
1508 | goto out; |
1509 | } | |
1510 | #endif /* CONFIG_NFSD_V3 */ | |
1511 | ||
1512 | /* | |
1513 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1514 | * fits into the buffer. On return, it contains the true length. | |
1515 | * N.B. After this call fhp needs an fh_put | |
1516 | */ | |
6264d69d | 1517 | __be32 |
1da177e4 LT |
1518 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1519 | { | |
1520 | struct dentry *dentry; | |
1521 | struct inode *inode; | |
1522 | mm_segment_t oldfs; | |
6264d69d AV |
1523 | __be32 err; |
1524 | int host_err; | |
1da177e4 | 1525 | |
8837abca | 1526 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
1da177e4 LT |
1527 | if (err) |
1528 | goto out; | |
1529 | ||
1530 | dentry = fhp->fh_dentry; | |
1531 | inode = dentry->d_inode; | |
1532 | ||
1533 | err = nfserr_inval; | |
acfa4380 | 1534 | if (!inode->i_op->readlink) |
1da177e4 LT |
1535 | goto out; |
1536 | ||
54775491 | 1537 | touch_atime(fhp->fh_export->ex_path.mnt, dentry); |
1da177e4 LT |
1538 | /* N.B. Why does this call need a get_fs()?? |
1539 | * Remove the set_fs and watch the fireworks:-) --okir | |
1540 | */ | |
1541 | ||
1542 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
6264d69d | 1543 | host_err = inode->i_op->readlink(dentry, buf, *lenp); |
1da177e4 LT |
1544 | set_fs(oldfs); |
1545 | ||
6264d69d | 1546 | if (host_err < 0) |
1da177e4 | 1547 | goto out_nfserr; |
6264d69d | 1548 | *lenp = host_err; |
1da177e4 LT |
1549 | err = 0; |
1550 | out: | |
1551 | return err; | |
1552 | ||
1553 | out_nfserr: | |
6264d69d | 1554 | err = nfserrno(host_err); |
1da177e4 LT |
1555 | goto out; |
1556 | } | |
1557 | ||
1558 | /* | |
1559 | * Create a symlink and look up its inode | |
1560 | * N.B. After this call _both_ fhp and resfhp need an fh_put | |
1561 | */ | |
6264d69d | 1562 | __be32 |
1da177e4 LT |
1563 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1564 | char *fname, int flen, | |
1565 | char *path, int plen, | |
1566 | struct svc_fh *resfhp, | |
1567 | struct iattr *iap) | |
1568 | { | |
1569 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1570 | __be32 err, cerr; |
1571 | int host_err; | |
1da177e4 LT |
1572 | |
1573 | err = nfserr_noent; | |
1574 | if (!flen || !plen) | |
1575 | goto out; | |
1576 | err = nfserr_exist; | |
1577 | if (isdotent(fname, flen)) | |
1578 | goto out; | |
1579 | ||
8837abca | 1580 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1581 | if (err) |
1582 | goto out; | |
1583 | fh_lock(fhp); | |
1584 | dentry = fhp->fh_dentry; | |
1585 | dnew = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1586 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1587 | if (IS_ERR(dnew)) |
1588 | goto out_nfserr; | |
1589 | ||
75c3f29d DH |
1590 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
1591 | if (host_err) | |
1592 | goto out_nfserr; | |
1593 | ||
1da177e4 LT |
1594 | if (unlikely(path[plen] != 0)) { |
1595 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); | |
1596 | if (path_alloced == NULL) | |
6264d69d | 1597 | host_err = -ENOMEM; |
1da177e4 LT |
1598 | else { |
1599 | strncpy(path_alloced, path, plen); | |
1600 | path_alloced[plen] = 0; | |
db2e747b | 1601 | host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced); |
1da177e4 LT |
1602 | kfree(path_alloced); |
1603 | } | |
1604 | } else | |
db2e747b | 1605 | host_err = vfs_symlink(dentry->d_inode, dnew, path); |
6264d69d | 1606 | err = nfserrno(host_err); |
f501912a BM |
1607 | if (!err) |
1608 | err = nfserrno(commit_metadata(fhp)); | |
1da177e4 LT |
1609 | fh_unlock(fhp); |
1610 | ||
75c3f29d DH |
1611 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
1612 | ||
1da177e4 LT |
1613 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
1614 | dput(dnew); | |
1615 | if (err==0) err = cerr; | |
1616 | out: | |
1617 | return err; | |
1618 | ||
1619 | out_nfserr: | |
6264d69d | 1620 | err = nfserrno(host_err); |
1da177e4 LT |
1621 | goto out; |
1622 | } | |
1623 | ||
1624 | /* | |
1625 | * Create a hardlink | |
1626 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1627 | */ | |
6264d69d | 1628 | __be32 |
1da177e4 LT |
1629 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1630 | char *name, int len, struct svc_fh *tfhp) | |
1631 | { | |
1632 | struct dentry *ddir, *dnew, *dold; | |
1633 | struct inode *dirp, *dest; | |
6264d69d AV |
1634 | __be32 err; |
1635 | int host_err; | |
1da177e4 | 1636 | |
8837abca | 1637 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1638 | if (err) |
1639 | goto out; | |
8837abca | 1640 | err = fh_verify(rqstp, tfhp, -S_IFDIR, NFSD_MAY_NOP); |
1da177e4 LT |
1641 | if (err) |
1642 | goto out; | |
1643 | ||
1644 | err = nfserr_perm; | |
1645 | if (!len) | |
1646 | goto out; | |
1647 | err = nfserr_exist; | |
1648 | if (isdotent(name, len)) | |
1649 | goto out; | |
1650 | ||
12fd3520 | 1651 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
1da177e4 LT |
1652 | ddir = ffhp->fh_dentry; |
1653 | dirp = ddir->d_inode; | |
1654 | ||
1655 | dnew = lookup_one_len(name, ddir, len); | |
6264d69d | 1656 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1657 | if (IS_ERR(dnew)) |
1658 | goto out_nfserr; | |
1659 | ||
1660 | dold = tfhp->fh_dentry; | |
1661 | dest = dold->d_inode; | |
1662 | ||
75c3f29d DH |
1663 | host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); |
1664 | if (host_err) { | |
1665 | err = nfserrno(host_err); | |
1666 | goto out_dput; | |
1667 | } | |
6264d69d AV |
1668 | host_err = vfs_link(dold, dirp, dnew); |
1669 | if (!host_err) { | |
f501912a BM |
1670 | err = nfserrno(commit_metadata(ffhp)); |
1671 | if (!err) | |
1672 | err = nfserrno(commit_metadata(tfhp)); | |
1da177e4 | 1673 | } else { |
6264d69d | 1674 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1675 | err = nfserr_acces; |
1676 | else | |
6264d69d | 1677 | err = nfserrno(host_err); |
1da177e4 | 1678 | } |
75c3f29d DH |
1679 | mnt_drop_write(tfhp->fh_export->ex_path.mnt); |
1680 | out_dput: | |
1da177e4 | 1681 | dput(dnew); |
270d56e5 DR |
1682 | out_unlock: |
1683 | fh_unlock(ffhp); | |
1da177e4 LT |
1684 | out: |
1685 | return err; | |
1686 | ||
1687 | out_nfserr: | |
6264d69d | 1688 | err = nfserrno(host_err); |
270d56e5 | 1689 | goto out_unlock; |
1da177e4 LT |
1690 | } |
1691 | ||
1692 | /* | |
1693 | * Rename a file | |
1694 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1695 | */ | |
6264d69d | 1696 | __be32 |
1da177e4 LT |
1697 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1698 | struct svc_fh *tfhp, char *tname, int tlen) | |
1699 | { | |
1700 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1701 | struct inode *fdir, *tdir; | |
6264d69d AV |
1702 | __be32 err; |
1703 | int host_err; | |
1da177e4 | 1704 | |
8837abca | 1705 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1706 | if (err) |
1707 | goto out; | |
8837abca | 1708 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1709 | if (err) |
1710 | goto out; | |
1711 | ||
1712 | fdentry = ffhp->fh_dentry; | |
1713 | fdir = fdentry->d_inode; | |
1714 | ||
1715 | tdentry = tfhp->fh_dentry; | |
1716 | tdir = tdentry->d_inode; | |
1717 | ||
1718 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; | |
a56f3937 | 1719 | if (ffhp->fh_export != tfhp->fh_export) |
1da177e4 LT |
1720 | goto out; |
1721 | ||
1722 | err = nfserr_perm; | |
1723 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1724 | goto out; | |
1725 | ||
1726 | /* cannot use fh_lock as we need deadlock protective ordering | |
1727 | * so do it by hand */ | |
1728 | trap = lock_rename(tdentry, fdentry); | |
1729 | ffhp->fh_locked = tfhp->fh_locked = 1; | |
1730 | fill_pre_wcc(ffhp); | |
1731 | fill_pre_wcc(tfhp); | |
1732 | ||
1733 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1734 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1735 | if (IS_ERR(odentry)) |
1736 | goto out_nfserr; | |
1737 | ||
6264d69d | 1738 | host_err = -ENOENT; |
1da177e4 LT |
1739 | if (!odentry->d_inode) |
1740 | goto out_dput_old; | |
6264d69d | 1741 | host_err = -EINVAL; |
1da177e4 LT |
1742 | if (odentry == trap) |
1743 | goto out_dput_old; | |
1744 | ||
1745 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1746 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1747 | if (IS_ERR(ndentry)) |
1748 | goto out_dput_old; | |
6264d69d | 1749 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1750 | if (ndentry == trap) |
1751 | goto out_dput_new; | |
1752 | ||
9079b1eb | 1753 | if (svc_msnfs(ffhp) && |
1da177e4 LT |
1754 | ((atomic_read(&odentry->d_count) > 1) |
1755 | || (atomic_read(&ndentry->d_count) > 1))) { | |
6264d69d | 1756 | host_err = -EPERM; |
9079b1eb DH |
1757 | goto out_dput_new; |
1758 | } | |
1759 | ||
1760 | host_err = -EXDEV; | |
1761 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) | |
1762 | goto out_dput_new; | |
1763 | host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); | |
1764 | if (host_err) | |
1765 | goto out_dput_new; | |
1766 | ||
6264d69d | 1767 | host_err = vfs_rename(fdir, odentry, tdir, ndentry); |
f501912a BM |
1768 | if (!host_err) { |
1769 | host_err = commit_metadata(tfhp); | |
6264d69d | 1770 | if (!host_err) |
f501912a | 1771 | host_err = commit_metadata(ffhp); |
1da177e4 LT |
1772 | } |
1773 | ||
9079b1eb DH |
1774 | mnt_drop_write(ffhp->fh_export->ex_path.mnt); |
1775 | ||
1da177e4 LT |
1776 | out_dput_new: |
1777 | dput(ndentry); | |
1778 | out_dput_old: | |
1779 | dput(odentry); | |
1780 | out_nfserr: | |
6264d69d | 1781 | err = nfserrno(host_err); |
1da177e4 LT |
1782 | |
1783 | /* we cannot reply on fh_unlock on the two filehandles, | |
1784 | * as that would do the wrong thing if the two directories | |
1785 | * were the same, so again we do it by hand | |
1786 | */ | |
1787 | fill_post_wcc(ffhp); | |
1788 | fill_post_wcc(tfhp); | |
1789 | unlock_rename(tdentry, fdentry); | |
1790 | ffhp->fh_locked = tfhp->fh_locked = 0; | |
1791 | ||
1792 | out: | |
1793 | return err; | |
1794 | } | |
1795 | ||
1796 | /* | |
1797 | * Unlink a file or directory | |
1798 | * N.B. After this call fhp needs an fh_put | |
1799 | */ | |
6264d69d | 1800 | __be32 |
1da177e4 LT |
1801 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1802 | char *fname, int flen) | |
1803 | { | |
1804 | struct dentry *dentry, *rdentry; | |
1805 | struct inode *dirp; | |
6264d69d AV |
1806 | __be32 err; |
1807 | int host_err; | |
1da177e4 LT |
1808 | |
1809 | err = nfserr_acces; | |
1810 | if (!flen || isdotent(fname, flen)) | |
1811 | goto out; | |
8837abca | 1812 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1813 | if (err) |
1814 | goto out; | |
1815 | ||
12fd3520 | 1816 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1817 | dentry = fhp->fh_dentry; |
1818 | dirp = dentry->d_inode; | |
1819 | ||
1820 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1821 | host_err = PTR_ERR(rdentry); |
1da177e4 LT |
1822 | if (IS_ERR(rdentry)) |
1823 | goto out_nfserr; | |
1824 | ||
1825 | if (!rdentry->d_inode) { | |
1826 | dput(rdentry); | |
1827 | err = nfserr_noent; | |
1828 | goto out; | |
1829 | } | |
1830 | ||
1831 | if (!type) | |
1832 | type = rdentry->d_inode->i_mode & S_IFMT; | |
1833 | ||
0622753b DH |
1834 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
1835 | if (host_err) | |
1836 | goto out_nfserr; | |
1837 | ||
1da177e4 LT |
1838 | if (type != S_IFDIR) { /* It's UNLINK */ |
1839 | #ifdef MSNFS | |
1840 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && | |
1841 | (atomic_read(&rdentry->d_count) > 1)) { | |
6264d69d | 1842 | host_err = -EPERM; |
1da177e4 LT |
1843 | } else |
1844 | #endif | |
6264d69d | 1845 | host_err = vfs_unlink(dirp, rdentry); |
1da177e4 | 1846 | } else { /* It's RMDIR */ |
6264d69d | 1847 | host_err = vfs_rmdir(dirp, rdentry); |
1da177e4 LT |
1848 | } |
1849 | ||
1850 | dput(rdentry); | |
1851 | ||
f501912a BM |
1852 | if (!host_err) |
1853 | host_err = commit_metadata(fhp); | |
1da177e4 | 1854 | |
0622753b | 1855 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
1da177e4 | 1856 | out_nfserr: |
6264d69d | 1857 | err = nfserrno(host_err); |
f193fbab YT |
1858 | out: |
1859 | return err; | |
1da177e4 LT |
1860 | } |
1861 | ||
14f7dd63 DW |
1862 | /* |
1863 | * We do this buffering because we must not call back into the file | |
1864 | * system's ->lookup() method from the filldir callback. That may well | |
1865 | * deadlock a number of file systems. | |
1866 | * | |
1867 | * This is based heavily on the implementation of same in XFS. | |
1868 | */ | |
1869 | struct buffered_dirent { | |
1870 | u64 ino; | |
1871 | loff_t offset; | |
1872 | int namlen; | |
1873 | unsigned int d_type; | |
1874 | char name[]; | |
1875 | }; | |
1876 | ||
1877 | struct readdir_data { | |
1878 | char *dirent; | |
1879 | size_t used; | |
53c9c5c0 | 1880 | int full; |
14f7dd63 DW |
1881 | }; |
1882 | ||
1883 | static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen, | |
1884 | loff_t offset, u64 ino, unsigned int d_type) | |
1885 | { | |
1886 | struct readdir_data *buf = __buf; | |
1887 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); | |
1888 | unsigned int reclen; | |
1889 | ||
1890 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); | |
53c9c5c0 AV |
1891 | if (buf->used + reclen > PAGE_SIZE) { |
1892 | buf->full = 1; | |
14f7dd63 | 1893 | return -EINVAL; |
53c9c5c0 | 1894 | } |
14f7dd63 DW |
1895 | |
1896 | de->namlen = namlen; | |
1897 | de->offset = offset; | |
1898 | de->ino = ino; | |
1899 | de->d_type = d_type; | |
1900 | memcpy(de->name, name, namlen); | |
1901 | buf->used += reclen; | |
1902 | ||
1903 | return 0; | |
1904 | } | |
1905 | ||
2f9092e1 DW |
1906 | static __be32 nfsd_buffered_readdir(struct file *file, filldir_t func, |
1907 | struct readdir_cd *cdp, loff_t *offsetp) | |
2628b766 | 1908 | { |
14f7dd63 DW |
1909 | struct readdir_data buf; |
1910 | struct buffered_dirent *de; | |
2628b766 | 1911 | int host_err; |
14f7dd63 DW |
1912 | int size; |
1913 | loff_t offset; | |
2628b766 | 1914 | |
14f7dd63 DW |
1915 | buf.dirent = (void *)__get_free_page(GFP_KERNEL); |
1916 | if (!buf.dirent) | |
2f9092e1 | 1917 | return nfserrno(-ENOMEM); |
14f7dd63 DW |
1918 | |
1919 | offset = *offsetp; | |
2628b766 | 1920 | |
14f7dd63 | 1921 | while (1) { |
2f9092e1 | 1922 | struct inode *dir_inode = file->f_path.dentry->d_inode; |
14f7dd63 DW |
1923 | unsigned int reclen; |
1924 | ||
b726e923 | 1925 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
14f7dd63 | 1926 | buf.used = 0; |
53c9c5c0 | 1927 | buf.full = 0; |
14f7dd63 DW |
1928 | |
1929 | host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf); | |
53c9c5c0 AV |
1930 | if (buf.full) |
1931 | host_err = 0; | |
1932 | ||
1933 | if (host_err < 0) | |
14f7dd63 DW |
1934 | break; |
1935 | ||
1936 | size = buf.used; | |
1937 | ||
1938 | if (!size) | |
1939 | break; | |
1940 | ||
2f9092e1 DW |
1941 | /* |
1942 | * Various filldir functions may end up calling back into | |
1943 | * lookup_one_len() and the file system's ->lookup() method. | |
1944 | * These expect i_mutex to be held, as it would within readdir. | |
1945 | */ | |
1946 | host_err = mutex_lock_killable(&dir_inode->i_mutex); | |
1947 | if (host_err) | |
1948 | break; | |
1949 | ||
14f7dd63 DW |
1950 | de = (struct buffered_dirent *)buf.dirent; |
1951 | while (size > 0) { | |
1952 | offset = de->offset; | |
1953 | ||
1954 | if (func(cdp, de->name, de->namlen, de->offset, | |
1955 | de->ino, de->d_type)) | |
2f9092e1 | 1956 | break; |
14f7dd63 DW |
1957 | |
1958 | if (cdp->err != nfs_ok) | |
2f9092e1 | 1959 | break; |
14f7dd63 DW |
1960 | |
1961 | reclen = ALIGN(sizeof(*de) + de->namlen, | |
1962 | sizeof(u64)); | |
1963 | size -= reclen; | |
1964 | de = (struct buffered_dirent *)((char *)de + reclen); | |
1965 | } | |
2f9092e1 DW |
1966 | mutex_unlock(&dir_inode->i_mutex); |
1967 | if (size > 0) /* We bailed out early */ | |
1968 | break; | |
1969 | ||
c002a6c7 | 1970 | offset = vfs_llseek(file, 0, SEEK_CUR); |
14f7dd63 DW |
1971 | } |
1972 | ||
14f7dd63 | 1973 | free_page((unsigned long)(buf.dirent)); |
2628b766 DW |
1974 | |
1975 | if (host_err) | |
1976 | return nfserrno(host_err); | |
14f7dd63 DW |
1977 | |
1978 | *offsetp = offset; | |
1979 | return cdp->err; | |
2628b766 DW |
1980 | } |
1981 | ||
1da177e4 LT |
1982 | /* |
1983 | * Read entries from a directory. | |
1984 | * The NFSv3/4 verifier we ignore for now. | |
1985 | */ | |
6264d69d | 1986 | __be32 |
1da177e4 | 1987 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
a0ad13ef | 1988 | struct readdir_cd *cdp, filldir_t func) |
1da177e4 | 1989 | { |
6264d69d | 1990 | __be32 err; |
1da177e4 LT |
1991 | struct file *file; |
1992 | loff_t offset = *offsetp; | |
1993 | ||
8837abca | 1994 | err = nfsd_open(rqstp, fhp, S_IFDIR, NFSD_MAY_READ, &file); |
1da177e4 LT |
1995 | if (err) |
1996 | goto out; | |
1997 | ||
1998 | offset = vfs_llseek(file, offset, 0); | |
1999 | if (offset < 0) { | |
2000 | err = nfserrno((int)offset); | |
2001 | goto out_close; | |
2002 | } | |
2003 | ||
14f7dd63 | 2004 | err = nfsd_buffered_readdir(file, func, cdp, offsetp); |
1da177e4 LT |
2005 | |
2006 | if (err == nfserr_eof || err == nfserr_toosmall) | |
2007 | err = nfs_ok; /* can still be found in ->err */ | |
2008 | out_close: | |
2009 | nfsd_close(file); | |
2010 | out: | |
2011 | return err; | |
2012 | } | |
2013 | ||
2014 | /* | |
2015 | * Get file system stats | |
2016 | * N.B. After this call fhp needs an fh_put | |
2017 | */ | |
6264d69d | 2018 | __be32 |
04716e66 | 2019 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) |
1da177e4 | 2020 | { |
04716e66 | 2021 | __be32 err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); |
726c3342 | 2022 | if (!err && vfs_statfs(fhp->fh_dentry,stat)) |
1da177e4 LT |
2023 | err = nfserr_io; |
2024 | return err; | |
2025 | } | |
2026 | ||
c7d51402 | 2027 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
e22841c6 | 2028 | { |
c7d51402 | 2029 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
e22841c6 BF |
2030 | } |
2031 | ||
1da177e4 LT |
2032 | /* |
2033 | * Check for a user's access permissions to this inode. | |
2034 | */ | |
6264d69d | 2035 | __be32 |
0ec757df BF |
2036 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
2037 | struct dentry *dentry, int acc) | |
1da177e4 LT |
2038 | { |
2039 | struct inode *inode = dentry->d_inode; | |
14dba533 | 2040 | struct path path; |
1da177e4 LT |
2041 | int err; |
2042 | ||
8837abca | 2043 | if (acc == NFSD_MAY_NOP) |
1da177e4 LT |
2044 | return 0; |
2045 | #if 0 | |
2046 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
2047 | acc, | |
8837abca MS |
2048 | (acc & NFSD_MAY_READ)? " read" : "", |
2049 | (acc & NFSD_MAY_WRITE)? " write" : "", | |
2050 | (acc & NFSD_MAY_EXEC)? " exec" : "", | |
2051 | (acc & NFSD_MAY_SATTR)? " sattr" : "", | |
2052 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", | |
2053 | (acc & NFSD_MAY_LOCK)? " lock" : "", | |
2054 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1da177e4 LT |
2055 | inode->i_mode, |
2056 | IS_IMMUTABLE(inode)? " immut" : "", | |
2057 | IS_APPEND(inode)? " append" : "", | |
2c463e95 | 2058 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
1da177e4 | 2059 | dprintk(" owner %d/%d user %d/%d\n", |
5cc0a840 | 2060 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
1da177e4 LT |
2061 | #endif |
2062 | ||
2063 | /* Normally we reject any write/sattr etc access on a read-only file | |
2064 | * system. But if it is IRIX doing check on write-access for a | |
2065 | * device special file, we ignore rofs. | |
2066 | */ | |
8837abca MS |
2067 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
2068 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { | |
2c463e95 DH |
2069 | if (exp_rdonly(rqstp, exp) || |
2070 | __mnt_is_readonly(exp->ex_path.mnt)) | |
1da177e4 | 2071 | return nfserr_rofs; |
8837abca | 2072 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
1da177e4 LT |
2073 | return nfserr_perm; |
2074 | } | |
8837abca | 2075 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
1da177e4 LT |
2076 | return nfserr_perm; |
2077 | ||
8837abca | 2078 | if (acc & NFSD_MAY_LOCK) { |
1da177e4 LT |
2079 | /* If we cannot rely on authentication in NLM requests, |
2080 | * just allow locks, otherwise require read permission, or | |
2081 | * ownership | |
2082 | */ | |
2083 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
2084 | return 0; | |
2085 | else | |
8837abca | 2086 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
1da177e4 LT |
2087 | } |
2088 | /* | |
2089 | * The file owner always gets access permission for accesses that | |
2090 | * would normally be checked at open time. This is to make | |
2091 | * file access work even when the client has done a fchmod(fd, 0). | |
2092 | * | |
2093 | * However, `cp foo bar' should fail nevertheless when bar is | |
2094 | * readonly. A sensible way to do this might be to reject all | |
2095 | * attempts to truncate a read-only file, because a creat() call | |
2096 | * always implies file truncation. | |
2097 | * ... but this isn't really fair. A process may reasonably call | |
2098 | * ftruncate on an open file descriptor on a file with perm 000. | |
2099 | * We must trust the client to do permission checking - using "ACCESS" | |
2100 | * with NFSv3. | |
2101 | */ | |
8837abca | 2102 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
5cc0a840 | 2103 | inode->i_uid == current_fsuid()) |
1da177e4 LT |
2104 | return 0; |
2105 | ||
8837abca | 2106 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
f419a2e3 | 2107 | err = inode_permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC)); |
1da177e4 LT |
2108 | |
2109 | /* Allow read access to binaries even when mode 111 */ | |
2110 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
8837abca | 2111 | acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE)) |
f419a2e3 | 2112 | err = inode_permission(inode, MAY_EXEC); |
14dba533 MZ |
2113 | if (err) |
2114 | goto nfsd_out; | |
1da177e4 | 2115 | |
14dba533 MZ |
2116 | /* Do integrity (permission) checking now, but defer incrementing |
2117 | * IMA counts to the actual file open. | |
2118 | */ | |
2119 | path.mnt = exp->ex_path.mnt; | |
2120 | path.dentry = dentry; | |
14dba533 | 2121 | nfsd_out: |
1da177e4 LT |
2122 | return err? nfserrno(err) : 0; |
2123 | } | |
2124 | ||
2125 | void | |
2126 | nfsd_racache_shutdown(void) | |
2127 | { | |
54a66e54 JL |
2128 | struct raparms *raparm, *last_raparm; |
2129 | unsigned int i; | |
2130 | ||
1da177e4 | 2131 | dprintk("nfsd: freeing readahead buffers.\n"); |
54a66e54 JL |
2132 | |
2133 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { | |
2134 | raparm = raparm_hash[i].pb_head; | |
2135 | while(raparm) { | |
2136 | last_raparm = raparm; | |
2137 | raparm = raparm->p_next; | |
2138 | kfree(last_raparm); | |
2139 | } | |
2140 | raparm_hash[i].pb_head = NULL; | |
2141 | } | |
1da177e4 LT |
2142 | } |
2143 | /* | |
2144 | * Initialize readahead param cache | |
2145 | */ | |
2146 | int | |
2147 | nfsd_racache_init(int cache_size) | |
2148 | { | |
2149 | int i; | |
fce1456a GB |
2150 | int j = 0; |
2151 | int nperbucket; | |
54a66e54 | 2152 | struct raparms **raparm = NULL; |
1da177e4 | 2153 | |
fce1456a | 2154 | |
54a66e54 | 2155 | if (raparm_hash[0].pb_head) |
1da177e4 | 2156 | return 0; |
54a66e54 JL |
2157 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
2158 | if (nperbucket < 2) | |
2159 | nperbucket = 2; | |
2160 | cache_size = nperbucket * RAPARM_HASH_SIZE; | |
4b3bb06b YB |
2161 | |
2162 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); | |
54a66e54 JL |
2163 | |
2164 | for (i = 0; i < RAPARM_HASH_SIZE; i++) { | |
4b3bb06b | 2165 | spin_lock_init(&raparm_hash[i].pb_lock); |
54a66e54 JL |
2166 | |
2167 | raparm = &raparm_hash[i].pb_head; | |
2168 | for (j = 0; j < nperbucket; j++) { | |
2169 | *raparm = kzalloc(sizeof(struct raparms), GFP_KERNEL); | |
2170 | if (!*raparm) | |
2171 | goto out_nomem; | |
2172 | raparm = &(*raparm)->p_next; | |
2173 | } | |
2174 | *raparm = NULL; | |
4b3bb06b YB |
2175 | } |
2176 | ||
1da177e4 LT |
2177 | nfsdstats.ra_size = cache_size; |
2178 | return 0; | |
54a66e54 JL |
2179 | |
2180 | out_nomem: | |
2181 | dprintk("nfsd: kmalloc failed, freeing readahead buffers\n"); | |
2182 | nfsd_racache_shutdown(); | |
2183 | return -ENOMEM; | |
1da177e4 | 2184 | } |
a257cdd0 AG |
2185 | |
2186 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
2187 | struct posix_acl * | |
2188 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) | |
2189 | { | |
2190 | struct inode *inode = fhp->fh_dentry->d_inode; | |
2191 | char *name; | |
2192 | void *value = NULL; | |
2193 | ssize_t size; | |
2194 | struct posix_acl *acl; | |
2195 | ||
5be196e5 CH |
2196 | if (!IS_POSIXACL(inode)) |
2197 | return ERR_PTR(-EOPNOTSUPP); | |
2198 | ||
2199 | switch (type) { | |
2200 | case ACL_TYPE_ACCESS: | |
2201 | name = POSIX_ACL_XATTR_ACCESS; | |
2202 | break; | |
2203 | case ACL_TYPE_DEFAULT: | |
2204 | name = POSIX_ACL_XATTR_DEFAULT; | |
2205 | break; | |
2206 | default: | |
a257cdd0 | 2207 | return ERR_PTR(-EOPNOTSUPP); |
a257cdd0 AG |
2208 | } |
2209 | ||
5be196e5 CH |
2210 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
2211 | if (size < 0) | |
2212 | return ERR_PTR(size); | |
a257cdd0 | 2213 | |
a257cdd0 | 2214 | acl = posix_acl_from_xattr(value, size); |
a257cdd0 AG |
2215 | kfree(value); |
2216 | return acl; | |
2217 | } | |
2218 | ||
2219 | int | |
2220 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) | |
2221 | { | |
2222 | struct inode *inode = fhp->fh_dentry->d_inode; | |
2223 | char *name; | |
2224 | void *value = NULL; | |
2225 | size_t size; | |
2226 | int error; | |
2227 | ||
acfa4380 | 2228 | if (!IS_POSIXACL(inode) || |
a257cdd0 AG |
2229 | !inode->i_op->setxattr || !inode->i_op->removexattr) |
2230 | return -EOPNOTSUPP; | |
2231 | switch(type) { | |
2232 | case ACL_TYPE_ACCESS: | |
334a13ec | 2233 | name = POSIX_ACL_XATTR_ACCESS; |
a257cdd0 AG |
2234 | break; |
2235 | case ACL_TYPE_DEFAULT: | |
334a13ec | 2236 | name = POSIX_ACL_XATTR_DEFAULT; |
a257cdd0 AG |
2237 | break; |
2238 | default: | |
2239 | return -EOPNOTSUPP; | |
2240 | } | |
2241 | ||
2242 | if (acl && acl->a_count) { | |
334a13ec | 2243 | size = posix_acl_xattr_size(acl->a_count); |
a257cdd0 AG |
2244 | value = kmalloc(size, GFP_KERNEL); |
2245 | if (!value) | |
2246 | return -ENOMEM; | |
9ccfc29c FM |
2247 | error = posix_acl_to_xattr(acl, value, size); |
2248 | if (error < 0) | |
a257cdd0 | 2249 | goto getout; |
9ccfc29c | 2250 | size = error; |
a257cdd0 AG |
2251 | } else |
2252 | size = 0; | |
2253 | ||
18f335af DH |
2254 | error = mnt_want_write(fhp->fh_export->ex_path.mnt); |
2255 | if (error) | |
2256 | goto getout; | |
a257cdd0 | 2257 | if (size) |
5be196e5 | 2258 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
a257cdd0 AG |
2259 | else { |
2260 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) | |
2261 | error = 0; | |
2262 | else { | |
5be196e5 | 2263 | error = vfs_removexattr(fhp->fh_dentry, name); |
a257cdd0 AG |
2264 | if (error == -ENODATA) |
2265 | error = 0; | |
2266 | } | |
2267 | } | |
18f335af | 2268 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
a257cdd0 AG |
2269 | |
2270 | getout: | |
2271 | kfree(value); | |
2272 | return error; | |
2273 | } | |
2274 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |