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