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Commit | Line | Data |
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1da177e4 LT |
1 | #define MSNFS /* HACK HACK */ |
2 | /* | |
3 | * linux/fs/nfsd/vfs.c | |
4 | * | |
5 | * File operations used by nfsd. Some of these have been ripped from | |
6 | * other parts of the kernel because they weren't exported, others | |
7 | * are partial duplicates with added or changed functionality. | |
8 | * | |
9 | * Note that several functions dget() the dentry upon which they want | |
10 | * to act, most notably those that create directory entries. Response | |
11 | * dentry's are dput()'d if necessary in the release callback. | |
12 | * So if you notice code paths that apparently fail to dput() the | |
13 | * dentry, don't worry--they have been taken care of. | |
14 | * | |
15 | * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> | |
16 | * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> | |
17 | */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/string.h> |
20 | #include <linux/time.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/file.h> | |
24 | #include <linux/mount.h> | |
25 | #include <linux/major.h> | |
d6b29d7c | 26 | #include <linux/splice.h> |
1da177e4 LT |
27 | #include <linux/proc_fs.h> |
28 | #include <linux/stat.h> | |
29 | #include <linux/fcntl.h> | |
30 | #include <linux/net.h> | |
31 | #include <linux/unistd.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/pagemap.h> | |
34 | #include <linux/in.h> | |
35 | #include <linux/module.h> | |
36 | #include <linux/namei.h> | |
37 | #include <linux/vfs.h> | |
38 | #include <linux/delay.h> | |
39 | #include <linux/sunrpc/svc.h> | |
40 | #include <linux/nfsd/nfsd.h> | |
41 | #ifdef CONFIG_NFSD_V3 | |
42 | #include <linux/nfs3.h> | |
43 | #include <linux/nfsd/xdr3.h> | |
44 | #endif /* CONFIG_NFSD_V3 */ | |
45 | #include <linux/nfsd/nfsfh.h> | |
46 | #include <linux/quotaops.h> | |
0eeca283 | 47 | #include <linux/fsnotify.h> |
1da177e4 LT |
48 | #include <linux/posix_acl.h> |
49 | #include <linux/posix_acl_xattr.h> | |
1da177e4 | 50 | #include <linux/xattr.h> |
5be196e5 | 51 | #ifdef CONFIG_NFSD_V4 |
1da177e4 LT |
52 | #include <linux/nfs4.h> |
53 | #include <linux/nfs4_acl.h> | |
54 | #include <linux/nfsd_idmap.h> | |
55 | #include <linux/security.h> | |
56 | #endif /* CONFIG_NFSD_V4 */ | |
fce1456a | 57 | #include <linux/jhash.h> |
1da177e4 LT |
58 | |
59 | #include <asm/uaccess.h> | |
60 | ||
61 | #define NFSDDBG_FACILITY NFSDDBG_FILEOP | |
1da177e4 LT |
62 | |
63 | ||
1da177e4 LT |
64 | /* |
65 | * This is a cache of readahead params that help us choose the proper | |
66 | * readahead strategy. Initially, we set all readahead parameters to 0 | |
67 | * and let the VFS handle things. | |
68 | * If you increase the number of cached files very much, you'll need to | |
69 | * add a hash table here. | |
70 | */ | |
71 | struct raparms { | |
72 | struct raparms *p_next; | |
73 | unsigned int p_count; | |
74 | ino_t p_ino; | |
75 | dev_t p_dev; | |
76 | int p_set; | |
77 | struct file_ra_state p_ra; | |
fce1456a | 78 | unsigned int p_hindex; |
1da177e4 LT |
79 | }; |
80 | ||
fce1456a GB |
81 | struct raparm_hbucket { |
82 | struct raparms *pb_head; | |
83 | spinlock_t pb_lock; | |
84 | } ____cacheline_aligned_in_smp; | |
85 | ||
1da177e4 | 86 | static struct raparms * raparml; |
fce1456a GB |
87 | #define RAPARM_HASH_BITS 4 |
88 | #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) | |
89 | #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) | |
90 | static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; | |
1da177e4 LT |
91 | |
92 | /* | |
93 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed | |
94 | * a mount point. | |
e0bb89ef | 95 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
1da177e4 LT |
96 | * or nfs_ok having possibly changed *dpp and *expp |
97 | */ | |
98 | int | |
99 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, | |
100 | struct svc_export **expp) | |
101 | { | |
102 | struct svc_export *exp = *expp, *exp2 = NULL; | |
103 | struct dentry *dentry = *dpp; | |
54775491 | 104 | struct vfsmount *mnt = mntget(exp->ex_path.mnt); |
1da177e4 | 105 | struct dentry *mounts = dget(dentry); |
6264d69d | 106 | int err = 0; |
1da177e4 LT |
107 | |
108 | while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts)); | |
109 | ||
0989a788 | 110 | exp2 = rqst_exp_get_by_name(rqstp, mnt, mounts); |
1da177e4 | 111 | if (IS_ERR(exp2)) { |
a1033be7 NB |
112 | if (PTR_ERR(exp2) != -ENOENT) |
113 | err = PTR_ERR(exp2); | |
1da177e4 LT |
114 | dput(mounts); |
115 | mntput(mnt); | |
116 | goto out; | |
117 | } | |
5d3dbbea | 118 | if ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { |
1da177e4 LT |
119 | /* successfully crossed mount point */ |
120 | exp_put(exp); | |
121 | *expp = exp2; | |
122 | dput(dentry); | |
123 | *dpp = mounts; | |
124 | } else { | |
5d3dbbea | 125 | exp_put(exp2); |
1da177e4 LT |
126 | dput(mounts); |
127 | } | |
128 | mntput(mnt); | |
129 | out: | |
130 | return err; | |
131 | } | |
132 | ||
6264d69d | 133 | __be32 |
6c0a654d | 134 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
5a022fc8 | 135 | const char *name, unsigned int len, |
6c0a654d | 136 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
1da177e4 LT |
137 | { |
138 | struct svc_export *exp; | |
139 | struct dentry *dparent; | |
140 | struct dentry *dentry; | |
6264d69d AV |
141 | __be32 err; |
142 | int host_err; | |
1da177e4 LT |
143 | |
144 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); | |
145 | ||
146 | /* Obtain dentry and export. */ | |
147 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC); | |
148 | if (err) | |
149 | return err; | |
150 | ||
151 | dparent = fhp->fh_dentry; | |
152 | exp = fhp->fh_export; | |
153 | exp_get(exp); | |
154 | ||
1da177e4 LT |
155 | /* Lookup the name, but don't follow links */ |
156 | if (isdotent(name, len)) { | |
157 | if (len==1) | |
158 | dentry = dget(dparent); | |
54775491 | 159 | else if (dparent != exp->ex_path.dentry) |
1da177e4 | 160 | dentry = dget_parent(dparent); |
54775491 | 161 | else if (!EX_NOHIDE(exp)) |
1da177e4 LT |
162 | dentry = dget(dparent); /* .. == . just like at / */ |
163 | else { | |
164 | /* checking mountpoint crossing is very different when stepping up */ | |
165 | struct svc_export *exp2 = NULL; | |
166 | struct dentry *dp; | |
54775491 | 167 | struct vfsmount *mnt = mntget(exp->ex_path.mnt); |
1da177e4 LT |
168 | dentry = dget(dparent); |
169 | while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry)) | |
170 | ; | |
171 | dp = dget_parent(dentry); | |
172 | dput(dentry); | |
173 | dentry = dp; | |
174 | ||
0989a788 | 175 | exp2 = rqst_exp_parent(rqstp, mnt, dentry); |
2d3bb252 BF |
176 | if (PTR_ERR(exp2) == -ENOENT) { |
177 | dput(dentry); | |
178 | dentry = dget(dparent); | |
179 | } else if (IS_ERR(exp2)) { | |
6264d69d | 180 | host_err = PTR_ERR(exp2); |
1da177e4 LT |
181 | dput(dentry); |
182 | mntput(mnt); | |
183 | goto out_nfserr; | |
1da177e4 LT |
184 | } else { |
185 | exp_put(exp); | |
186 | exp = exp2; | |
187 | } | |
188 | mntput(mnt); | |
189 | } | |
190 | } else { | |
191 | fh_lock(fhp); | |
192 | dentry = lookup_one_len(name, dparent, len); | |
6264d69d | 193 | host_err = PTR_ERR(dentry); |
1da177e4 LT |
194 | if (IS_ERR(dentry)) |
195 | goto out_nfserr; | |
196 | /* | |
197 | * check if we have crossed a mount point ... | |
198 | */ | |
199 | if (d_mountpoint(dentry)) { | |
6264d69d | 200 | if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
1da177e4 LT |
201 | dput(dentry); |
202 | goto out_nfserr; | |
203 | } | |
204 | } | |
205 | } | |
6c0a654d BF |
206 | *dentry_ret = dentry; |
207 | *exp_ret = exp; | |
208 | return 0; | |
209 | ||
210 | out_nfserr: | |
211 | exp_put(exp); | |
212 | return nfserrno(host_err); | |
213 | } | |
214 | ||
215 | /* | |
216 | * Look up one component of a pathname. | |
217 | * N.B. After this call _both_ fhp and resfh need an fh_put | |
218 | * | |
219 | * If the lookup would cross a mountpoint, and the mounted filesystem | |
220 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is | |
221 | * accepted as it stands and the mounted directory is | |
222 | * returned. Otherwise the covered directory is returned. | |
223 | * NOTE: this mountpoint crossing is not supported properly by all | |
224 | * clients and is explicitly disallowed for NFSv3 | |
225 | * NeilBrown <neilb@cse.unsw.edu.au> | |
226 | */ | |
227 | __be32 | |
228 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, | |
5a022fc8 | 229 | unsigned int len, struct svc_fh *resfh) |
6c0a654d BF |
230 | { |
231 | struct svc_export *exp; | |
232 | struct dentry *dentry; | |
233 | __be32 err; | |
234 | ||
235 | err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); | |
236 | if (err) | |
237 | return err; | |
32c1eb0c AA |
238 | err = check_nfsd_access(exp, rqstp); |
239 | if (err) | |
240 | goto out; | |
1da177e4 LT |
241 | /* |
242 | * Note: we compose the file handle now, but as the | |
243 | * dentry may be negative, it may need to be updated. | |
244 | */ | |
245 | err = fh_compose(resfh, exp, dentry, fhp); | |
246 | if (!err && !dentry->d_inode) | |
247 | err = nfserr_noent; | |
32c1eb0c | 248 | out: |
1da177e4 | 249 | dput(dentry); |
1da177e4 LT |
250 | exp_put(exp); |
251 | return err; | |
1da177e4 LT |
252 | } |
253 | ||
6c0a654d | 254 | |
1da177e4 LT |
255 | /* |
256 | * Set various file attributes. | |
257 | * N.B. After this call fhp needs an fh_put | |
258 | */ | |
6264d69d | 259 | __be32 |
1da177e4 LT |
260 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, |
261 | int check_guard, time_t guardtime) | |
262 | { | |
263 | struct dentry *dentry; | |
264 | struct inode *inode; | |
265 | int accmode = MAY_SATTR; | |
266 | int ftype = 0; | |
267 | int imode; | |
6264d69d AV |
268 | __be32 err; |
269 | int host_err; | |
1da177e4 LT |
270 | int size_change = 0; |
271 | ||
272 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) | |
273 | accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE; | |
274 | if (iap->ia_valid & ATTR_SIZE) | |
275 | ftype = S_IFREG; | |
276 | ||
277 | /* Get inode */ | |
278 | err = fh_verify(rqstp, fhp, ftype, accmode); | |
15b7a1b8 | 279 | if (err) |
1da177e4 LT |
280 | goto out; |
281 | ||
282 | dentry = fhp->fh_dentry; | |
283 | inode = dentry->d_inode; | |
284 | ||
15b7a1b8 N |
285 | /* Ignore any mode updates on symlinks */ |
286 | if (S_ISLNK(inode->i_mode)) | |
287 | iap->ia_valid &= ~ATTR_MODE; | |
288 | ||
289 | if (!iap->ia_valid) | |
290 | goto out; | |
291 | ||
9c85fca5 CH |
292 | /* |
293 | * NFSv2 does not differentiate between "set-[ac]time-to-now" | |
1da177e4 LT |
294 | * which only requires access, and "set-[ac]time-to-X" which |
295 | * requires ownership. | |
296 | * So if it looks like it might be "set both to the same time which | |
297 | * is close to now", and if inode_change_ok fails, then we | |
298 | * convert to "set to now" instead of "set to explicit time" | |
299 | * | |
300 | * We only call inode_change_ok as the last test as technically | |
301 | * it is not an interface that we should be using. It is only | |
302 | * valid if the filesystem does not define it's own i_op->setattr. | |
303 | */ | |
304 | #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) | |
305 | #define MAX_TOUCH_TIME_ERROR (30*60) | |
9c85fca5 CH |
306 | if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET && |
307 | iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) { | |
308 | /* | |
309 | * Looks probable. | |
310 | * | |
311 | * Now just make sure time is in the right ballpark. | |
312 | * Solaris, at least, doesn't seem to care what the time | |
313 | * request is. We require it be within 30 minutes of now. | |
1da177e4 | 314 | */ |
9c85fca5 CH |
315 | time_t delta = iap->ia_atime.tv_sec - get_seconds(); |
316 | if (delta < 0) | |
317 | delta = -delta; | |
318 | if (delta < MAX_TOUCH_TIME_ERROR && | |
319 | inode_change_ok(inode, iap) != 0) { | |
320 | /* | |
321 | * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME. | |
322 | * This will cause notify_change to set these times | |
323 | * to "now" | |
324 | */ | |
325 | iap->ia_valid &= ~BOTH_TIME_SET; | |
326 | } | |
1da177e4 LT |
327 | } |
328 | ||
9c85fca5 CH |
329 | /* |
330 | * The size case is special. | |
331 | * It changes the file as well as the attributes. | |
332 | */ | |
1da177e4 LT |
333 | if (iap->ia_valid & ATTR_SIZE) { |
334 | if (iap->ia_size < inode->i_size) { | |
0ec757df | 335 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE); |
1da177e4 LT |
336 | if (err) |
337 | goto out; | |
338 | } | |
339 | ||
340 | /* | |
341 | * If we are changing the size of the file, then | |
342 | * we need to break all leases. | |
343 | */ | |
6264d69d AV |
344 | host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); |
345 | if (host_err == -EWOULDBLOCK) | |
346 | host_err = -ETIMEDOUT; | |
347 | if (host_err) /* ENOMEM or EWOULDBLOCK */ | |
1da177e4 LT |
348 | goto out_nfserr; |
349 | ||
6264d69d AV |
350 | host_err = get_write_access(inode); |
351 | if (host_err) | |
1da177e4 LT |
352 | goto out_nfserr; |
353 | ||
354 | size_change = 1; | |
6264d69d AV |
355 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); |
356 | if (host_err) { | |
1da177e4 LT |
357 | put_write_access(inode); |
358 | goto out_nfserr; | |
359 | } | |
360 | DQUOT_INIT(inode); | |
361 | } | |
362 | ||
363 | imode = inode->i_mode; | |
364 | if (iap->ia_valid & ATTR_MODE) { | |
365 | iap->ia_mode &= S_IALLUGO; | |
366 | imode = iap->ia_mode |= (imode & ~S_IALLUGO); | |
8a0ce7d9 JL |
367 | /* if changing uid/gid revoke setuid/setgid in mode */ |
368 | if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) { | |
369 | iap->ia_valid |= ATTR_KILL_PRIV; | |
370 | iap->ia_mode &= ~S_ISUID; | |
371 | } | |
372 | if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) | |
373 | iap->ia_mode &= ~S_ISGID; | |
374 | } else { | |
375 | /* | |
376 | * Revoke setuid/setgid bit on chown/chgrp | |
377 | */ | |
378 | if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) | |
379 | iap->ia_valid |= ATTR_KILL_SUID | ATTR_KILL_PRIV; | |
380 | if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) | |
381 | iap->ia_valid |= ATTR_KILL_SGID; | |
1da177e4 LT |
382 | } |
383 | ||
1da177e4 LT |
384 | /* Change the attributes. */ |
385 | ||
386 | iap->ia_valid |= ATTR_CTIME; | |
387 | ||
388 | err = nfserr_notsync; | |
389 | if (!check_guard || guardtime == inode->i_ctime.tv_sec) { | |
390 | fh_lock(fhp); | |
6264d69d AV |
391 | host_err = notify_change(dentry, iap); |
392 | err = nfserrno(host_err); | |
1da177e4 LT |
393 | fh_unlock(fhp); |
394 | } | |
395 | if (size_change) | |
396 | put_write_access(inode); | |
397 | if (!err) | |
398 | if (EX_ISSYNC(fhp->fh_export)) | |
399 | write_inode_now(inode, 1); | |
400 | out: | |
401 | return err; | |
402 | ||
403 | out_nfserr: | |
6264d69d | 404 | err = nfserrno(host_err); |
1da177e4 LT |
405 | goto out; |
406 | } | |
407 | ||
5be196e5 CH |
408 | #if defined(CONFIG_NFSD_V2_ACL) || \ |
409 | defined(CONFIG_NFSD_V3_ACL) || \ | |
410 | defined(CONFIG_NFSD_V4) | |
411 | static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) | |
412 | { | |
413 | ssize_t buflen; | |
5be196e5 CH |
414 | |
415 | buflen = vfs_getxattr(dentry, key, NULL, 0); | |
416 | if (buflen <= 0) | |
417 | return buflen; | |
1da177e4 | 418 | |
5be196e5 CH |
419 | *buf = kmalloc(buflen, GFP_KERNEL); |
420 | if (!*buf) | |
421 | return -ENOMEM; | |
422 | ||
b5872b0d | 423 | return vfs_getxattr(dentry, key, *buf, buflen); |
5be196e5 CH |
424 | } |
425 | #endif | |
426 | ||
427 | #if defined(CONFIG_NFSD_V4) | |
1da177e4 LT |
428 | static int |
429 | set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) | |
430 | { | |
431 | int len; | |
432 | size_t buflen; | |
433 | char *buf = NULL; | |
434 | int error = 0; | |
1da177e4 LT |
435 | |
436 | buflen = posix_acl_xattr_size(pacl->a_count); | |
437 | buf = kmalloc(buflen, GFP_KERNEL); | |
438 | error = -ENOMEM; | |
439 | if (buf == NULL) | |
440 | goto out; | |
441 | ||
442 | len = posix_acl_to_xattr(pacl, buf, buflen); | |
443 | if (len < 0) { | |
444 | error = len; | |
445 | goto out; | |
446 | } | |
447 | ||
5be196e5 | 448 | error = vfs_setxattr(dentry, key, buf, len, 0); |
1da177e4 LT |
449 | out: |
450 | kfree(buf); | |
451 | return error; | |
452 | } | |
453 | ||
6264d69d | 454 | __be32 |
1da177e4 LT |
455 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
456 | struct nfs4_acl *acl) | |
457 | { | |
6264d69d AV |
458 | __be32 error; |
459 | int host_error; | |
1da177e4 LT |
460 | struct dentry *dentry; |
461 | struct inode *inode; | |
462 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
463 | unsigned int flags = 0; | |
464 | ||
465 | /* Get inode */ | |
466 | error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR); | |
467 | if (error) | |
4b2ca38a | 468 | return error; |
1da177e4 LT |
469 | |
470 | dentry = fhp->fh_dentry; | |
471 | inode = dentry->d_inode; | |
472 | if (S_ISDIR(inode->i_mode)) | |
473 | flags = NFS4_ACL_DIR; | |
474 | ||
6264d69d AV |
475 | host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
476 | if (host_error == -EINVAL) { | |
4b2ca38a | 477 | return nfserr_attrnotsupp; |
6264d69d | 478 | } else if (host_error < 0) |
1da177e4 LT |
479 | goto out_nfserr; |
480 | ||
6264d69d AV |
481 | host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); |
482 | if (host_error < 0) | |
4b2ca38a | 483 | goto out_release; |
1da177e4 | 484 | |
4b2ca38a | 485 | if (S_ISDIR(inode->i_mode)) |
6264d69d | 486 | host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); |
1da177e4 | 487 | |
4b2ca38a | 488 | out_release: |
1da177e4 LT |
489 | posix_acl_release(pacl); |
490 | posix_acl_release(dpacl); | |
1da177e4 | 491 | out_nfserr: |
f34f9242 | 492 | if (host_error == -EOPNOTSUPP) |
4b2ca38a | 493 | return nfserr_attrnotsupp; |
f34f9242 | 494 | else |
4b2ca38a | 495 | return nfserrno(host_error); |
1da177e4 LT |
496 | } |
497 | ||
498 | static struct posix_acl * | |
499 | _get_posix_acl(struct dentry *dentry, char *key) | |
500 | { | |
5be196e5 | 501 | void *buf = NULL; |
1da177e4 | 502 | struct posix_acl *pacl = NULL; |
5be196e5 | 503 | int buflen; |
1da177e4 | 504 | |
5be196e5 CH |
505 | buflen = nfsd_getxattr(dentry, key, &buf); |
506 | if (!buflen) | |
507 | buflen = -ENODATA; | |
508 | if (buflen <= 0) | |
509 | return ERR_PTR(buflen); | |
1da177e4 LT |
510 | |
511 | pacl = posix_acl_from_xattr(buf, buflen); | |
1da177e4 LT |
512 | kfree(buf); |
513 | return pacl; | |
1da177e4 LT |
514 | } |
515 | ||
516 | int | |
517 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) | |
518 | { | |
519 | struct inode *inode = dentry->d_inode; | |
520 | int error = 0; | |
521 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
522 | unsigned int flags = 0; | |
523 | ||
9a59f452 | 524 | pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); |
1da177e4 LT |
525 | if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) |
526 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); | |
527 | if (IS_ERR(pacl)) { | |
528 | error = PTR_ERR(pacl); | |
529 | pacl = NULL; | |
530 | goto out; | |
531 | } | |
532 | ||
533 | if (S_ISDIR(inode->i_mode)) { | |
9a59f452 | 534 | dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); |
1da177e4 LT |
535 | if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) |
536 | dpacl = NULL; | |
537 | else if (IS_ERR(dpacl)) { | |
538 | error = PTR_ERR(dpacl); | |
539 | dpacl = NULL; | |
540 | goto out; | |
541 | } | |
542 | flags = NFS4_ACL_DIR; | |
543 | } | |
544 | ||
545 | *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); | |
546 | if (IS_ERR(*acl)) { | |
547 | error = PTR_ERR(*acl); | |
548 | *acl = NULL; | |
549 | } | |
550 | out: | |
551 | posix_acl_release(pacl); | |
552 | posix_acl_release(dpacl); | |
553 | return error; | |
554 | } | |
555 | ||
556 | #endif /* defined(CONFIG_NFS_V4) */ | |
557 | ||
558 | #ifdef CONFIG_NFSD_V3 | |
559 | /* | |
560 | * Check server access rights to a file system object | |
561 | */ | |
562 | struct accessmap { | |
563 | u32 access; | |
564 | int how; | |
565 | }; | |
566 | static struct accessmap nfs3_regaccess[] = { | |
567 | { NFS3_ACCESS_READ, MAY_READ }, | |
568 | { NFS3_ACCESS_EXECUTE, MAY_EXEC }, | |
569 | { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC }, | |
570 | { NFS3_ACCESS_EXTEND, MAY_WRITE }, | |
571 | ||
572 | { 0, 0 } | |
573 | }; | |
574 | ||
575 | static struct accessmap nfs3_diraccess[] = { | |
576 | { NFS3_ACCESS_READ, MAY_READ }, | |
577 | { NFS3_ACCESS_LOOKUP, MAY_EXEC }, | |
578 | { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC }, | |
579 | { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE }, | |
580 | { NFS3_ACCESS_DELETE, MAY_REMOVE }, | |
581 | ||
582 | { 0, 0 } | |
583 | }; | |
584 | ||
585 | static struct accessmap nfs3_anyaccess[] = { | |
586 | /* Some clients - Solaris 2.6 at least, make an access call | |
587 | * to the server to check for access for things like /dev/null | |
588 | * (which really, the server doesn't care about). So | |
589 | * We provide simple access checking for them, looking | |
590 | * mainly at mode bits, and we make sure to ignore read-only | |
591 | * filesystem checks | |
592 | */ | |
593 | { NFS3_ACCESS_READ, MAY_READ }, | |
594 | { NFS3_ACCESS_EXECUTE, MAY_EXEC }, | |
595 | { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS }, | |
596 | { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS }, | |
597 | ||
598 | { 0, 0 } | |
599 | }; | |
600 | ||
6264d69d | 601 | __be32 |
1da177e4 LT |
602 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
603 | { | |
604 | struct accessmap *map; | |
605 | struct svc_export *export; | |
606 | struct dentry *dentry; | |
607 | u32 query, result = 0, sresult = 0; | |
6264d69d | 608 | __be32 error; |
1da177e4 LT |
609 | |
610 | error = fh_verify(rqstp, fhp, 0, MAY_NOP); | |
611 | if (error) | |
612 | goto out; | |
613 | ||
614 | export = fhp->fh_export; | |
615 | dentry = fhp->fh_dentry; | |
616 | ||
617 | if (S_ISREG(dentry->d_inode->i_mode)) | |
618 | map = nfs3_regaccess; | |
619 | else if (S_ISDIR(dentry->d_inode->i_mode)) | |
620 | map = nfs3_diraccess; | |
621 | else | |
622 | map = nfs3_anyaccess; | |
623 | ||
624 | ||
625 | query = *access; | |
626 | for (; map->access; map++) { | |
627 | if (map->access & query) { | |
6264d69d | 628 | __be32 err2; |
1da177e4 LT |
629 | |
630 | sresult |= map->access; | |
631 | ||
0ec757df | 632 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
1da177e4 LT |
633 | switch (err2) { |
634 | case nfs_ok: | |
635 | result |= map->access; | |
636 | break; | |
637 | ||
638 | /* the following error codes just mean the access was not allowed, | |
639 | * rather than an error occurred */ | |
640 | case nfserr_rofs: | |
641 | case nfserr_acces: | |
642 | case nfserr_perm: | |
643 | /* simply don't "or" in the access bit. */ | |
644 | break; | |
645 | default: | |
646 | error = err2; | |
647 | goto out; | |
648 | } | |
649 | } | |
650 | } | |
651 | *access = result; | |
652 | if (supported) | |
653 | *supported = sresult; | |
654 | ||
655 | out: | |
656 | return error; | |
657 | } | |
658 | #endif /* CONFIG_NFSD_V3 */ | |
659 | ||
660 | ||
661 | ||
662 | /* | |
663 | * Open an existing file or directory. | |
664 | * The access argument indicates the type of open (read/write/lock) | |
665 | * N.B. After this call fhp needs an fh_put | |
666 | */ | |
6264d69d | 667 | __be32 |
1da177e4 LT |
668 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
669 | int access, struct file **filp) | |
670 | { | |
671 | struct dentry *dentry; | |
672 | struct inode *inode; | |
6264d69d AV |
673 | int flags = O_RDONLY|O_LARGEFILE; |
674 | __be32 err; | |
675 | int host_err; | |
1da177e4 LT |
676 | |
677 | /* | |
678 | * If we get here, then the client has already done an "open", | |
679 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE | |
680 | * in case a chmod has now revoked permission. | |
681 | */ | |
682 | err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE); | |
683 | if (err) | |
684 | goto out; | |
685 | ||
686 | dentry = fhp->fh_dentry; | |
687 | inode = dentry->d_inode; | |
688 | ||
689 | /* Disallow write access to files with the append-only bit set | |
690 | * or any access when mandatory locking enabled | |
691 | */ | |
692 | err = nfserr_perm; | |
693 | if (IS_APPEND(inode) && (access & MAY_WRITE)) | |
694 | goto out; | |
5e7fc436 BF |
695 | /* |
696 | * We must ignore files (but only files) which might have mandatory | |
697 | * locks on them because there is no way to know if the accesser has | |
698 | * the lock. | |
699 | */ | |
700 | if (S_ISREG((inode)->i_mode) && mandatory_lock(inode)) | |
1da177e4 LT |
701 | goto out; |
702 | ||
703 | if (!inode->i_fop) | |
704 | goto out; | |
705 | ||
706 | /* | |
707 | * Check to see if there are any leases on this file. | |
708 | * This may block while leases are broken. | |
709 | */ | |
6264d69d AV |
710 | host_err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0)); |
711 | if (host_err == -EWOULDBLOCK) | |
712 | host_err = -ETIMEDOUT; | |
713 | if (host_err) /* NOMEM or WOULDBLOCK */ | |
1da177e4 LT |
714 | goto out_nfserr; |
715 | ||
716 | if (access & MAY_WRITE) { | |
9ecb6a08 BF |
717 | if (access & MAY_READ) |
718 | flags = O_RDWR|O_LARGEFILE; | |
719 | else | |
720 | flags = O_WRONLY|O_LARGEFILE; | |
1da177e4 LT |
721 | |
722 | DQUOT_INIT(inode); | |
723 | } | |
54775491 JB |
724 | *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt), |
725 | flags); | |
1da177e4 | 726 | if (IS_ERR(*filp)) |
6264d69d | 727 | host_err = PTR_ERR(*filp); |
1da177e4 | 728 | out_nfserr: |
6264d69d | 729 | err = nfserrno(host_err); |
1da177e4 LT |
730 | out: |
731 | return err; | |
732 | } | |
733 | ||
734 | /* | |
735 | * Close a file. | |
736 | */ | |
737 | void | |
738 | nfsd_close(struct file *filp) | |
739 | { | |
740 | fput(filp); | |
741 | } | |
742 | ||
743 | /* | |
744 | * Sync a file | |
745 | * As this calls fsync (not fdatasync) there is no need for a write_inode | |
746 | * after it. | |
747 | */ | |
a334de28 | 748 | static inline int nfsd_dosync(struct file *filp, struct dentry *dp, |
99ac48f5 | 749 | const struct file_operations *fop) |
1da177e4 LT |
750 | { |
751 | struct inode *inode = dp->d_inode; | |
752 | int (*fsync) (struct file *, struct dentry *, int); | |
f193fbab | 753 | int err; |
1da177e4 | 754 | |
f193fbab YT |
755 | err = filemap_fdatawrite(inode->i_mapping); |
756 | if (err == 0 && fop && (fsync = fop->fsync)) | |
757 | err = fsync(filp, dp, 0); | |
758 | if (err == 0) | |
759 | err = filemap_fdatawait(inode->i_mapping); | |
a334de28 | 760 | |
f193fbab | 761 | return err; |
1da177e4 LT |
762 | } |
763 | ||
764 | ||
a334de28 | 765 | static int |
1da177e4 LT |
766 | nfsd_sync(struct file *filp) |
767 | { | |
a334de28 | 768 | int err; |
7eaa36e2 JJS |
769 | struct inode *inode = filp->f_path.dentry->d_inode; |
770 | dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name); | |
1b1dcc1b | 771 | mutex_lock(&inode->i_mutex); |
7eaa36e2 | 772 | err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op); |
1b1dcc1b | 773 | mutex_unlock(&inode->i_mutex); |
a334de28 DS |
774 | |
775 | return err; | |
1da177e4 LT |
776 | } |
777 | ||
f193fbab | 778 | int |
1da177e4 LT |
779 | nfsd_sync_dir(struct dentry *dp) |
780 | { | |
f193fbab | 781 | return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); |
1da177e4 LT |
782 | } |
783 | ||
784 | /* | |
785 | * Obtain the readahead parameters for the file | |
786 | * specified by (dev, ino). | |
787 | */ | |
1da177e4 LT |
788 | |
789 | static inline struct raparms * | |
790 | nfsd_get_raparms(dev_t dev, ino_t ino) | |
791 | { | |
792 | struct raparms *ra, **rap, **frap = NULL; | |
793 | int depth = 0; | |
fce1456a GB |
794 | unsigned int hash; |
795 | struct raparm_hbucket *rab; | |
796 | ||
797 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; | |
798 | rab = &raparm_hash[hash]; | |
1da177e4 | 799 | |
fce1456a GB |
800 | spin_lock(&rab->pb_lock); |
801 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { | |
1da177e4 LT |
802 | if (ra->p_ino == ino && ra->p_dev == dev) |
803 | goto found; | |
804 | depth++; | |
805 | if (ra->p_count == 0) | |
806 | frap = rap; | |
807 | } | |
808 | depth = nfsdstats.ra_size*11/10; | |
809 | if (!frap) { | |
fce1456a | 810 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
811 | return NULL; |
812 | } | |
813 | rap = frap; | |
814 | ra = *frap; | |
815 | ra->p_dev = dev; | |
816 | ra->p_ino = ino; | |
817 | ra->p_set = 0; | |
fce1456a | 818 | ra->p_hindex = hash; |
1da177e4 | 819 | found: |
fce1456a | 820 | if (rap != &rab->pb_head) { |
1da177e4 | 821 | *rap = ra->p_next; |
fce1456a GB |
822 | ra->p_next = rab->pb_head; |
823 | rab->pb_head = ra; | |
1da177e4 LT |
824 | } |
825 | ra->p_count++; | |
826 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; | |
fce1456a | 827 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
828 | return ra; |
829 | } | |
830 | ||
831 | /* | |
cf8208d0 JA |
832 | * Grab and keep cached pages associated with a file in the svc_rqst |
833 | * so that they can be passed to the network sendmsg/sendpage routines | |
834 | * directly. They will be released after the sending has completed. | |
1da177e4 LT |
835 | */ |
836 | static int | |
cf8208d0 JA |
837 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
838 | struct splice_desc *sd) | |
1da177e4 | 839 | { |
cf8208d0 | 840 | struct svc_rqst *rqstp = sd->u.data; |
44524359 | 841 | struct page **pp = rqstp->rq_respages + rqstp->rq_resused; |
cf8208d0 JA |
842 | struct page *page = buf->page; |
843 | size_t size; | |
844 | int ret; | |
1da177e4 | 845 | |
cac36bb0 | 846 | ret = buf->ops->confirm(pipe, buf); |
cf8208d0 JA |
847 | if (unlikely(ret)) |
848 | return ret; | |
849 | ||
850 | size = sd->len; | |
1da177e4 LT |
851 | |
852 | if (rqstp->rq_res.page_len == 0) { | |
853 | get_page(page); | |
44524359 N |
854 | put_page(*pp); |
855 | *pp = page; | |
856 | rqstp->rq_resused++; | |
cf8208d0 | 857 | rqstp->rq_res.page_base = buf->offset; |
1da177e4 | 858 | rqstp->rq_res.page_len = size; |
44524359 | 859 | } else if (page != pp[-1]) { |
1da177e4 | 860 | get_page(page); |
250f3915 N |
861 | if (*pp) |
862 | put_page(*pp); | |
44524359 N |
863 | *pp = page; |
864 | rqstp->rq_resused++; | |
1da177e4 | 865 | rqstp->rq_res.page_len += size; |
44524359 | 866 | } else |
1da177e4 | 867 | rqstp->rq_res.page_len += size; |
1da177e4 | 868 | |
1da177e4 LT |
869 | return size; |
870 | } | |
871 | ||
cf8208d0 JA |
872 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
873 | struct splice_desc *sd) | |
874 | { | |
875 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
876 | } | |
877 | ||
a8754bee DH |
878 | static inline int svc_msnfs(struct svc_fh *ffhp) |
879 | { | |
880 | #ifdef MSNFS | |
881 | return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS); | |
882 | #else | |
883 | return 0; | |
884 | #endif | |
885 | } | |
886 | ||
6264d69d | 887 | static __be32 |
1da177e4 LT |
888 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
889 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) | |
890 | { | |
891 | struct inode *inode; | |
892 | struct raparms *ra; | |
893 | mm_segment_t oldfs; | |
6264d69d AV |
894 | __be32 err; |
895 | int host_err; | |
1da177e4 LT |
896 | |
897 | err = nfserr_perm; | |
7eaa36e2 | 898 | inode = file->f_path.dentry->d_inode; |
a8754bee DH |
899 | |
900 | if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count)) | |
1da177e4 | 901 | goto out; |
1da177e4 LT |
902 | |
903 | /* Get readahead parameters */ | |
904 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); | |
905 | ||
906 | if (ra && ra->p_set) | |
907 | file->f_ra = ra->p_ra; | |
908 | ||
cf8208d0 JA |
909 | if (file->f_op->splice_read && rqstp->rq_splice_ok) { |
910 | struct splice_desc sd = { | |
911 | .len = 0, | |
912 | .total_len = *count, | |
913 | .pos = offset, | |
914 | .u.data = rqstp, | |
915 | }; | |
916 | ||
4fbef206 | 917 | rqstp->rq_resused = 1; |
cf8208d0 | 918 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
1da177e4 LT |
919 | } else { |
920 | oldfs = get_fs(); | |
921 | set_fs(KERNEL_DS); | |
6264d69d | 922 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
1da177e4 LT |
923 | set_fs(oldfs); |
924 | } | |
925 | ||
926 | /* Write back readahead params */ | |
927 | if (ra) { | |
fce1456a GB |
928 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; |
929 | spin_lock(&rab->pb_lock); | |
1da177e4 LT |
930 | ra->p_ra = file->f_ra; |
931 | ra->p_set = 1; | |
932 | ra->p_count--; | |
fce1456a | 933 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
934 | } |
935 | ||
6264d69d AV |
936 | if (host_err >= 0) { |
937 | nfsdstats.io_read += host_err; | |
938 | *count = host_err; | |
1da177e4 | 939 | err = 0; |
7eaa36e2 | 940 | fsnotify_access(file->f_path.dentry); |
1da177e4 | 941 | } else |
6264d69d | 942 | err = nfserrno(host_err); |
1da177e4 LT |
943 | out: |
944 | return err; | |
945 | } | |
946 | ||
9f708e40 NB |
947 | static void kill_suid(struct dentry *dentry) |
948 | { | |
949 | struct iattr ia; | |
b5376771 | 950 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; |
9f708e40 | 951 | |
1b1dcc1b | 952 | mutex_lock(&dentry->d_inode->i_mutex); |
9f708e40 | 953 | notify_change(dentry, &ia); |
1b1dcc1b | 954 | mutex_unlock(&dentry->d_inode->i_mutex); |
9f708e40 NB |
955 | } |
956 | ||
6264d69d | 957 | static __be32 |
1da177e4 LT |
958 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
959 | loff_t offset, struct kvec *vec, int vlen, | |
960 | unsigned long cnt, int *stablep) | |
961 | { | |
962 | struct svc_export *exp; | |
963 | struct dentry *dentry; | |
964 | struct inode *inode; | |
965 | mm_segment_t oldfs; | |
6264d69d AV |
966 | __be32 err = 0; |
967 | int host_err; | |
1da177e4 LT |
968 | int stable = *stablep; |
969 | ||
45bd3b3d | 970 | #ifdef MSNFS |
1da177e4 LT |
971 | err = nfserr_perm; |
972 | ||
1da177e4 | 973 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
7eaa36e2 | 974 | (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt))) |
1da177e4 LT |
975 | goto out; |
976 | #endif | |
977 | ||
7eaa36e2 | 978 | dentry = file->f_path.dentry; |
1da177e4 LT |
979 | inode = dentry->d_inode; |
980 | exp = fhp->fh_export; | |
981 | ||
982 | /* | |
983 | * Request sync writes if | |
984 | * - the sync export option has been set, or | |
985 | * - the client requested O_SYNC behavior (NFSv3 feature). | |
986 | * - The file system doesn't support fsync(). | |
987 | * When gathered writes have been configured for this volume, | |
988 | * flushing the data to disk is handled separately below. | |
989 | */ | |
990 | ||
991 | if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */ | |
992 | stable = 2; | |
993 | *stablep = 2; /* FILE_SYNC */ | |
994 | } | |
995 | ||
996 | if (!EX_ISSYNC(exp)) | |
997 | stable = 0; | |
998 | if (stable && !EX_WGATHER(exp)) | |
999 | file->f_flags |= O_SYNC; | |
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); |
6264d69d | 1005 | if (host_err >= 0) { |
1da177e4 | 1006 | nfsdstats.io_write += cnt; |
7eaa36e2 | 1007 | fsnotify_modify(file->f_path.dentry); |
1da177e4 LT |
1008 | } |
1009 | ||
1010 | /* clear setuid/setgid flag after write */ | |
6264d69d | 1011 | if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) |
9f708e40 | 1012 | kill_suid(dentry); |
1da177e4 | 1013 | |
6264d69d | 1014 | if (host_err >= 0 && stable) { |
1da177e4 LT |
1015 | static ino_t last_ino; |
1016 | static dev_t last_dev; | |
1017 | ||
1018 | /* | |
1019 | * Gathered writes: If another process is currently | |
1020 | * writing to the file, there's a high chance | |
1021 | * this is another nfsd (triggered by a bulk write | |
1022 | * from a client's biod). Rather than syncing the | |
1023 | * file with each write request, we sleep for 10 msec. | |
1024 | * | |
1025 | * I don't know if this roughly approximates | |
1026 | * C. Juszak's idea of gathered writes, but it's a | |
1027 | * nice and simple solution (IMHO), and it seems to | |
1028 | * work:-) | |
1029 | */ | |
1030 | if (EX_WGATHER(exp)) { | |
1031 | if (atomic_read(&inode->i_writecount) > 1 | |
1032 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
ba25f9dc | 1033 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); |
1da177e4 | 1034 | msleep(10); |
ba25f9dc | 1035 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); |
1da177e4 LT |
1036 | } |
1037 | ||
1038 | if (inode->i_state & I_DIRTY) { | |
ba25f9dc | 1039 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); |
6264d69d | 1040 | host_err=nfsd_sync(file); |
1da177e4 LT |
1041 | } |
1042 | #if 0 | |
1043 | wake_up(&inode->i_wait); | |
1044 | #endif | |
1045 | } | |
1046 | last_ino = inode->i_ino; | |
1047 | last_dev = inode->i_sb->s_dev; | |
1048 | } | |
1049 | ||
6264d69d AV |
1050 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
1051 | if (host_err >= 0) | |
1da177e4 LT |
1052 | err = 0; |
1053 | else | |
6264d69d | 1054 | err = nfserrno(host_err); |
1da177e4 LT |
1055 | out: |
1056 | return err; | |
1057 | } | |
1058 | ||
1059 | /* | |
1060 | * Read data from a file. count must contain the requested read count | |
1061 | * on entry. On return, *count contains the number of bytes actually read. | |
1062 | * N.B. After this call fhp needs an fh_put | |
1063 | */ | |
6264d69d | 1064 | __be32 |
1da177e4 LT |
1065 | nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1066 | loff_t offset, struct kvec *vec, int vlen, | |
1067 | unsigned long *count) | |
1068 | { | |
6264d69d | 1069 | __be32 err; |
1da177e4 LT |
1070 | |
1071 | if (file) { | |
0ec757df | 1072 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
1da177e4 LT |
1073 | MAY_READ|MAY_OWNER_OVERRIDE); |
1074 | if (err) | |
1075 | goto out; | |
1076 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
1077 | } else { | |
1078 | err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file); | |
1079 | if (err) | |
1080 | goto out; | |
1081 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
1082 | nfsd_close(file); | |
1083 | } | |
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 LT |
1094 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1095 | loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, | |
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, |
1da177e4 LT |
1102 | MAY_WRITE|MAY_OWNER_OVERRIDE); |
1103 | if (err) | |
1104 | goto out; | |
1105 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, | |
1106 | stablep); | |
1107 | } else { | |
1108 | err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file); | |
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. | |
1124 | * Strictly speaking, we could sync just the indicated file region here, | |
1125 | * but there's currently no way we can ask the VFS to do so. | |
1126 | * | |
1127 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1128 | * data to the client, as locking happens lower down in the filesystem. | |
1129 | */ | |
6264d69d | 1130 | __be32 |
1da177e4 LT |
1131 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1132 | loff_t offset, unsigned long count) | |
1133 | { | |
1134 | struct file *file; | |
6264d69d | 1135 | __be32 err; |
1da177e4 LT |
1136 | |
1137 | if ((u64)count > ~(u64)offset) | |
1138 | return nfserr_inval; | |
1139 | ||
1140 | if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0) | |
1141 | return err; | |
1142 | if (EX_ISSYNC(fhp->fh_export)) { | |
1143 | if (file->f_op && file->f_op->fsync) { | |
45bd3b3d | 1144 | err = nfserrno(nfsd_sync(file)); |
1da177e4 LT |
1145 | } else { |
1146 | err = nfserr_notsupp; | |
1147 | } | |
1148 | } | |
1149 | ||
1150 | nfsd_close(file); | |
1151 | return err; | |
1152 | } | |
1153 | #endif /* CONFIG_NFSD_V3 */ | |
1154 | ||
5c002b3b BF |
1155 | __be32 |
1156 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, | |
1157 | struct iattr *iap) | |
1158 | { | |
1159 | /* | |
1160 | * Mode has already been set earlier in create: | |
1161 | */ | |
1162 | iap->ia_valid &= ~ATTR_MODE; | |
1163 | /* | |
1164 | * Setting uid/gid works only for root. Irix appears to | |
1165 | * send along the gid on create when it tries to implement | |
1166 | * setgid directories via NFS: | |
1167 | */ | |
1168 | if (current->fsuid != 0) | |
1169 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); | |
1170 | if (iap->ia_valid) | |
1171 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); | |
1172 | return 0; | |
1173 | } | |
1174 | ||
1da177e4 LT |
1175 | /* |
1176 | * Create a file (regular, directory, device, fifo); UNIX sockets | |
1177 | * not yet implemented. | |
1178 | * If the response fh has been verified, the parent directory should | |
1179 | * already be locked. Note that the parent directory is left locked. | |
1180 | * | |
1181 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1182 | */ | |
6264d69d | 1183 | __be32 |
1da177e4 LT |
1184 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1185 | char *fname, int flen, struct iattr *iap, | |
1186 | int type, dev_t rdev, struct svc_fh *resfhp) | |
1187 | { | |
1188 | struct dentry *dentry, *dchild = NULL; | |
1189 | struct inode *dirp; | |
6264d69d | 1190 | __be32 err; |
5c002b3b | 1191 | __be32 err2; |
6264d69d | 1192 | int host_err; |
1da177e4 LT |
1193 | |
1194 | err = nfserr_perm; | |
1195 | if (!flen) | |
1196 | goto out; | |
1197 | err = nfserr_exist; | |
1198 | if (isdotent(fname, flen)) | |
1199 | goto out; | |
1200 | ||
1201 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); | |
1202 | if (err) | |
1203 | goto out; | |
1204 | ||
1205 | dentry = fhp->fh_dentry; | |
1206 | dirp = dentry->d_inode; | |
1207 | ||
1208 | err = nfserr_notdir; | |
1209 | if(!dirp->i_op || !dirp->i_op->lookup) | |
1210 | goto out; | |
1211 | /* | |
1212 | * Check whether the response file handle has been verified yet. | |
1213 | * If it has, the parent directory should already be locked. | |
1214 | */ | |
1215 | if (!resfhp->fh_dentry) { | |
1216 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ | |
12fd3520 | 1217 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 | 1218 | dchild = lookup_one_len(fname, dentry, flen); |
6264d69d | 1219 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1220 | if (IS_ERR(dchild)) |
1221 | goto out_nfserr; | |
1222 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
1223 | if (err) | |
1224 | goto out; | |
1225 | } else { | |
1226 | /* called from nfsd_proc_create */ | |
1227 | dchild = dget(resfhp->fh_dentry); | |
1228 | if (!fhp->fh_locked) { | |
1229 | /* not actually possible */ | |
1230 | printk(KERN_ERR | |
1231 | "nfsd_create: parent %s/%s not locked!\n", | |
1232 | dentry->d_parent->d_name.name, | |
1233 | dentry->d_name.name); | |
d75f2b9f | 1234 | err = nfserr_io; |
1da177e4 LT |
1235 | goto out; |
1236 | } | |
1237 | } | |
1238 | /* | |
1239 | * Make sure the child dentry is still negative ... | |
1240 | */ | |
1241 | err = nfserr_exist; | |
1242 | if (dchild->d_inode) { | |
1243 | dprintk("nfsd_create: dentry %s/%s not negative!\n", | |
1244 | dentry->d_name.name, dchild->d_name.name); | |
1245 | goto out; | |
1246 | } | |
1247 | ||
1248 | if (!(iap->ia_valid & ATTR_MODE)) | |
1249 | iap->ia_mode = 0; | |
1250 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1251 | ||
1252 | /* | |
1253 | * Get the dir op function pointer. | |
1254 | */ | |
088406bc | 1255 | err = 0; |
1da177e4 LT |
1256 | switch (type) { |
1257 | case S_IFREG: | |
463c3197 DH |
1258 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
1259 | if (host_err) | |
1260 | goto out_nfserr; | |
6264d69d | 1261 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
1da177e4 LT |
1262 | break; |
1263 | case S_IFDIR: | |
463c3197 DH |
1264 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
1265 | if (host_err) | |
1266 | goto out_nfserr; | |
6264d69d | 1267 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
1da177e4 LT |
1268 | break; |
1269 | case S_IFCHR: | |
1270 | case S_IFBLK: | |
1271 | case S_IFIFO: | |
1272 | case S_IFSOCK: | |
463c3197 DH |
1273 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
1274 | if (host_err) | |
1275 | goto out_nfserr; | |
6264d69d | 1276 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
1da177e4 LT |
1277 | break; |
1278 | default: | |
1279 | printk("nfsd: bad file type %o in nfsd_create\n", type); | |
6264d69d | 1280 | host_err = -EINVAL; |
463c3197 | 1281 | goto out_nfserr; |
1da177e4 | 1282 | } |
463c3197 DH |
1283 | if (host_err < 0) { |
1284 | mnt_drop_write(fhp->fh_export->ex_path.mnt); | |
1da177e4 | 1285 | goto out_nfserr; |
463c3197 | 1286 | } |
1da177e4 LT |
1287 | |
1288 | if (EX_ISSYNC(fhp->fh_export)) { | |
45bd3b3d | 1289 | err = nfserrno(nfsd_sync_dir(dentry)); |
1da177e4 LT |
1290 | write_inode_now(dchild->d_inode, 1); |
1291 | } | |
1292 | ||
1293 | ||
5c002b3b BF |
1294 | err2 = nfsd_create_setattr(rqstp, resfhp, iap); |
1295 | if (err2) | |
1296 | err = err2; | |
463c3197 | 1297 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
1da177e4 LT |
1298 | /* |
1299 | * Update the file handle to get the new inode info. | |
1300 | */ | |
1301 | if (!err) | |
1302 | err = fh_update(resfhp); | |
1303 | out: | |
1304 | if (dchild && !IS_ERR(dchild)) | |
1305 | dput(dchild); | |
1306 | return err; | |
1307 | ||
1308 | out_nfserr: | |
6264d69d | 1309 | err = nfserrno(host_err); |
1da177e4 LT |
1310 | goto out; |
1311 | } | |
1312 | ||
1313 | #ifdef CONFIG_NFSD_V3 | |
1314 | /* | |
1315 | * NFSv3 version of nfsd_create | |
1316 | */ | |
6264d69d | 1317 | __be32 |
1da177e4 LT |
1318 | nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1319 | char *fname, int flen, struct iattr *iap, | |
1320 | struct svc_fh *resfhp, int createmode, u32 *verifier, | |
81ac95c5 | 1321 | int *truncp, int *created) |
1da177e4 LT |
1322 | { |
1323 | struct dentry *dentry, *dchild = NULL; | |
1324 | struct inode *dirp; | |
6264d69d | 1325 | __be32 err; |
5c002b3b | 1326 | __be32 err2; |
6264d69d | 1327 | int host_err; |
1da177e4 | 1328 | __u32 v_mtime=0, v_atime=0; |
1da177e4 LT |
1329 | |
1330 | err = nfserr_perm; | |
1331 | if (!flen) | |
1332 | goto out; | |
1333 | err = nfserr_exist; | |
1334 | if (isdotent(fname, flen)) | |
1335 | goto out; | |
1336 | if (!(iap->ia_valid & ATTR_MODE)) | |
1337 | iap->ia_mode = 0; | |
1338 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); | |
1339 | if (err) | |
1340 | goto out; | |
1341 | ||
1342 | dentry = fhp->fh_dentry; | |
1343 | dirp = dentry->d_inode; | |
1344 | ||
1345 | /* Get all the sanity checks out of the way before | |
1346 | * we lock the parent. */ | |
1347 | err = nfserr_notdir; | |
1348 | if(!dirp->i_op || !dirp->i_op->lookup) | |
1349 | goto out; | |
12fd3520 | 1350 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1351 | |
1352 | /* | |
1353 | * Compose the response file handle. | |
1354 | */ | |
1355 | dchild = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1356 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1357 | if (IS_ERR(dchild)) |
1358 | goto out_nfserr; | |
1359 | ||
1360 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
1361 | if (err) | |
1362 | goto out; | |
1363 | ||
1364 | if (createmode == NFS3_CREATE_EXCLUSIVE) { | |
c397852c | 1365 | /* solaris7 gets confused (bugid 4218508) if these have |
749997e5 JL |
1366 | * the high bit set, so just clear the high bits. If this is |
1367 | * ever changed to use different attrs for storing the | |
1368 | * verifier, then do_open_lookup() will also need to be fixed | |
1369 | * accordingly. | |
1da177e4 LT |
1370 | */ |
1371 | v_mtime = verifier[0]&0x7fffffff; | |
1372 | v_atime = verifier[1]&0x7fffffff; | |
1da177e4 LT |
1373 | } |
1374 | ||
463c3197 DH |
1375 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
1376 | if (host_err) | |
1377 | goto out_nfserr; | |
1da177e4 LT |
1378 | if (dchild->d_inode) { |
1379 | err = 0; | |
1380 | ||
1381 | switch (createmode) { | |
1382 | case NFS3_CREATE_UNCHECKED: | |
1383 | if (! S_ISREG(dchild->d_inode->i_mode)) | |
1384 | err = nfserr_exist; | |
1385 | else if (truncp) { | |
1386 | /* in nfsv4, we need to treat this case a little | |
1387 | * differently. we don't want to truncate the | |
1388 | * file now; this would be wrong if the OPEN | |
1389 | * fails for some other reason. furthermore, | |
1390 | * if the size is nonzero, we should ignore it | |
1391 | * according to spec! | |
1392 | */ | |
1393 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; | |
1394 | } | |
1395 | else { | |
1396 | iap->ia_valid &= ATTR_SIZE; | |
1397 | goto set_attr; | |
1398 | } | |
1399 | break; | |
1400 | case NFS3_CREATE_EXCLUSIVE: | |
1401 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime | |
1402 | && dchild->d_inode->i_atime.tv_sec == v_atime | |
1da177e4 LT |
1403 | && dchild->d_inode->i_size == 0 ) |
1404 | break; | |
1405 | /* fallthru */ | |
1406 | case NFS3_CREATE_GUARDED: | |
1407 | err = nfserr_exist; | |
1408 | } | |
463c3197 | 1409 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
1da177e4 LT |
1410 | goto out; |
1411 | } | |
1412 | ||
6264d69d | 1413 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
463c3197 DH |
1414 | if (host_err < 0) { |
1415 | mnt_drop_write(fhp->fh_export->ex_path.mnt); | |
1da177e4 | 1416 | goto out_nfserr; |
463c3197 | 1417 | } |
81ac95c5 BF |
1418 | if (created) |
1419 | *created = 1; | |
1da177e4 LT |
1420 | |
1421 | if (EX_ISSYNC(fhp->fh_export)) { | |
45bd3b3d | 1422 | err = nfserrno(nfsd_sync_dir(dentry)); |
1da177e4 LT |
1423 | /* setattr will sync the child (or not) */ |
1424 | } | |
1425 | ||
1da177e4 | 1426 | if (createmode == NFS3_CREATE_EXCLUSIVE) { |
c397852c | 1427 | /* Cram the verifier into atime/mtime */ |
1da177e4 | 1428 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
c397852c | 1429 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
1da177e4 LT |
1430 | /* XXX someone who knows this better please fix it for nsec */ |
1431 | iap->ia_mtime.tv_sec = v_mtime; | |
1432 | iap->ia_atime.tv_sec = v_atime; | |
1433 | iap->ia_mtime.tv_nsec = 0; | |
1434 | iap->ia_atime.tv_nsec = 0; | |
1da177e4 LT |
1435 | } |
1436 | ||
1da177e4 | 1437 | set_attr: |
5c002b3b BF |
1438 | err2 = nfsd_create_setattr(rqstp, resfhp, iap); |
1439 | if (err2) | |
1440 | err = err2; | |
f193fbab | 1441 | |
463c3197 | 1442 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
f193fbab YT |
1443 | /* |
1444 | * Update the filehandle to get the new inode info. | |
1445 | */ | |
1446 | if (!err) | |
1447 | err = fh_update(resfhp); | |
1da177e4 LT |
1448 | |
1449 | out: | |
1450 | fh_unlock(fhp); | |
1451 | if (dchild && !IS_ERR(dchild)) | |
1452 | dput(dchild); | |
1453 | return err; | |
1454 | ||
1455 | out_nfserr: | |
6264d69d | 1456 | err = nfserrno(host_err); |
1da177e4 LT |
1457 | goto out; |
1458 | } | |
1459 | #endif /* CONFIG_NFSD_V3 */ | |
1460 | ||
1461 | /* | |
1462 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1463 | * fits into the buffer. On return, it contains the true length. | |
1464 | * N.B. After this call fhp needs an fh_put | |
1465 | */ | |
6264d69d | 1466 | __be32 |
1da177e4 LT |
1467 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1468 | { | |
1469 | struct dentry *dentry; | |
1470 | struct inode *inode; | |
1471 | mm_segment_t oldfs; | |
6264d69d AV |
1472 | __be32 err; |
1473 | int host_err; | |
1da177e4 LT |
1474 | |
1475 | err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP); | |
1476 | if (err) | |
1477 | goto out; | |
1478 | ||
1479 | dentry = fhp->fh_dentry; | |
1480 | inode = dentry->d_inode; | |
1481 | ||
1482 | err = nfserr_inval; | |
1483 | if (!inode->i_op || !inode->i_op->readlink) | |
1484 | goto out; | |
1485 | ||
54775491 | 1486 | touch_atime(fhp->fh_export->ex_path.mnt, dentry); |
1da177e4 LT |
1487 | /* N.B. Why does this call need a get_fs()?? |
1488 | * Remove the set_fs and watch the fireworks:-) --okir | |
1489 | */ | |
1490 | ||
1491 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
6264d69d | 1492 | host_err = inode->i_op->readlink(dentry, buf, *lenp); |
1da177e4 LT |
1493 | set_fs(oldfs); |
1494 | ||
6264d69d | 1495 | if (host_err < 0) |
1da177e4 | 1496 | goto out_nfserr; |
6264d69d | 1497 | *lenp = host_err; |
1da177e4 LT |
1498 | err = 0; |
1499 | out: | |
1500 | return err; | |
1501 | ||
1502 | out_nfserr: | |
6264d69d | 1503 | err = nfserrno(host_err); |
1da177e4 LT |
1504 | goto out; |
1505 | } | |
1506 | ||
1507 | /* | |
1508 | * Create a symlink and look up its inode | |
1509 | * N.B. After this call _both_ fhp and resfhp need an fh_put | |
1510 | */ | |
6264d69d | 1511 | __be32 |
1da177e4 LT |
1512 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1513 | char *fname, int flen, | |
1514 | char *path, int plen, | |
1515 | struct svc_fh *resfhp, | |
1516 | struct iattr *iap) | |
1517 | { | |
1518 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1519 | __be32 err, cerr; |
1520 | int host_err; | |
1da177e4 LT |
1521 | umode_t mode; |
1522 | ||
1523 | err = nfserr_noent; | |
1524 | if (!flen || !plen) | |
1525 | goto out; | |
1526 | err = nfserr_exist; | |
1527 | if (isdotent(fname, flen)) | |
1528 | goto out; | |
1529 | ||
1530 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); | |
1531 | if (err) | |
1532 | goto out; | |
1533 | fh_lock(fhp); | |
1534 | dentry = fhp->fh_dentry; | |
1535 | dnew = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1536 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1537 | if (IS_ERR(dnew)) |
1538 | goto out_nfserr; | |
1539 | ||
1540 | mode = S_IALLUGO; | |
1541 | /* Only the MODE ATTRibute is even vaguely meaningful */ | |
1542 | if (iap && (iap->ia_valid & ATTR_MODE)) | |
1543 | mode = iap->ia_mode & S_IALLUGO; | |
1544 | ||
75c3f29d DH |
1545 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
1546 | if (host_err) | |
1547 | goto out_nfserr; | |
1548 | ||
1da177e4 LT |
1549 | if (unlikely(path[plen] != 0)) { |
1550 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); | |
1551 | if (path_alloced == NULL) | |
6264d69d | 1552 | host_err = -ENOMEM; |
1da177e4 LT |
1553 | else { |
1554 | strncpy(path_alloced, path, plen); | |
1555 | path_alloced[plen] = 0; | |
6264d69d | 1556 | host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode); |
1da177e4 LT |
1557 | kfree(path_alloced); |
1558 | } | |
1559 | } else | |
6264d69d | 1560 | host_err = vfs_symlink(dentry->d_inode, dnew, path, mode); |
1da177e4 | 1561 | |
6264d69d | 1562 | if (!host_err) { |
1da177e4 | 1563 | if (EX_ISSYNC(fhp->fh_export)) |
6264d69d AV |
1564 | host_err = nfsd_sync_dir(dentry); |
1565 | } | |
1566 | err = nfserrno(host_err); | |
1da177e4 LT |
1567 | fh_unlock(fhp); |
1568 | ||
75c3f29d DH |
1569 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
1570 | ||
1da177e4 LT |
1571 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
1572 | dput(dnew); | |
1573 | if (err==0) err = cerr; | |
1574 | out: | |
1575 | return err; | |
1576 | ||
1577 | out_nfserr: | |
6264d69d | 1578 | err = nfserrno(host_err); |
1da177e4 LT |
1579 | goto out; |
1580 | } | |
1581 | ||
1582 | /* | |
1583 | * Create a hardlink | |
1584 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1585 | */ | |
6264d69d | 1586 | __be32 |
1da177e4 LT |
1587 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1588 | char *name, int len, struct svc_fh *tfhp) | |
1589 | { | |
1590 | struct dentry *ddir, *dnew, *dold; | |
1591 | struct inode *dirp, *dest; | |
6264d69d AV |
1592 | __be32 err; |
1593 | int host_err; | |
1da177e4 LT |
1594 | |
1595 | err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE); | |
1596 | if (err) | |
1597 | goto out; | |
1598 | err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP); | |
1599 | if (err) | |
1600 | goto out; | |
1601 | ||
1602 | err = nfserr_perm; | |
1603 | if (!len) | |
1604 | goto out; | |
1605 | err = nfserr_exist; | |
1606 | if (isdotent(name, len)) | |
1607 | goto out; | |
1608 | ||
12fd3520 | 1609 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
1da177e4 LT |
1610 | ddir = ffhp->fh_dentry; |
1611 | dirp = ddir->d_inode; | |
1612 | ||
1613 | dnew = lookup_one_len(name, ddir, len); | |
6264d69d | 1614 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1615 | if (IS_ERR(dnew)) |
1616 | goto out_nfserr; | |
1617 | ||
1618 | dold = tfhp->fh_dentry; | |
1619 | dest = dold->d_inode; | |
1620 | ||
75c3f29d DH |
1621 | host_err = mnt_want_write(tfhp->fh_export->ex_path.mnt); |
1622 | if (host_err) { | |
1623 | err = nfserrno(host_err); | |
1624 | goto out_dput; | |
1625 | } | |
6264d69d AV |
1626 | host_err = vfs_link(dold, dirp, dnew); |
1627 | if (!host_err) { | |
1da177e4 | 1628 | if (EX_ISSYNC(ffhp->fh_export)) { |
45bd3b3d | 1629 | err = nfserrno(nfsd_sync_dir(ddir)); |
1da177e4 LT |
1630 | write_inode_now(dest, 1); |
1631 | } | |
6264d69d | 1632 | err = 0; |
1da177e4 | 1633 | } else { |
6264d69d | 1634 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1635 | err = nfserr_acces; |
1636 | else | |
6264d69d | 1637 | err = nfserrno(host_err); |
1da177e4 | 1638 | } |
75c3f29d DH |
1639 | mnt_drop_write(tfhp->fh_export->ex_path.mnt); |
1640 | out_dput: | |
1da177e4 | 1641 | dput(dnew); |
270d56e5 DR |
1642 | out_unlock: |
1643 | fh_unlock(ffhp); | |
1da177e4 LT |
1644 | out: |
1645 | return err; | |
1646 | ||
1647 | out_nfserr: | |
6264d69d | 1648 | err = nfserrno(host_err); |
270d56e5 | 1649 | goto out_unlock; |
1da177e4 LT |
1650 | } |
1651 | ||
1652 | /* | |
1653 | * Rename a file | |
1654 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1655 | */ | |
6264d69d | 1656 | __be32 |
1da177e4 LT |
1657 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1658 | struct svc_fh *tfhp, char *tname, int tlen) | |
1659 | { | |
1660 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1661 | struct inode *fdir, *tdir; | |
6264d69d AV |
1662 | __be32 err; |
1663 | int host_err; | |
1da177e4 LT |
1664 | |
1665 | err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE); | |
1666 | if (err) | |
1667 | goto out; | |
1668 | err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE); | |
1669 | if (err) | |
1670 | goto out; | |
1671 | ||
1672 | fdentry = ffhp->fh_dentry; | |
1673 | fdir = fdentry->d_inode; | |
1674 | ||
1675 | tdentry = tfhp->fh_dentry; | |
1676 | tdir = tdentry->d_inode; | |
1677 | ||
1678 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; | |
a56f3937 | 1679 | if (ffhp->fh_export != tfhp->fh_export) |
1da177e4 LT |
1680 | goto out; |
1681 | ||
1682 | err = nfserr_perm; | |
1683 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1684 | goto out; | |
1685 | ||
1686 | /* cannot use fh_lock as we need deadlock protective ordering | |
1687 | * so do it by hand */ | |
1688 | trap = lock_rename(tdentry, fdentry); | |
1689 | ffhp->fh_locked = tfhp->fh_locked = 1; | |
1690 | fill_pre_wcc(ffhp); | |
1691 | fill_pre_wcc(tfhp); | |
1692 | ||
1693 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1694 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1695 | if (IS_ERR(odentry)) |
1696 | goto out_nfserr; | |
1697 | ||
6264d69d | 1698 | host_err = -ENOENT; |
1da177e4 LT |
1699 | if (!odentry->d_inode) |
1700 | goto out_dput_old; | |
6264d69d | 1701 | host_err = -EINVAL; |
1da177e4 LT |
1702 | if (odentry == trap) |
1703 | goto out_dput_old; | |
1704 | ||
1705 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1706 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1707 | if (IS_ERR(ndentry)) |
1708 | goto out_dput_old; | |
6264d69d | 1709 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1710 | if (ndentry == trap) |
1711 | goto out_dput_new; | |
1712 | ||
9079b1eb | 1713 | if (svc_msnfs(ffhp) && |
1da177e4 LT |
1714 | ((atomic_read(&odentry->d_count) > 1) |
1715 | || (atomic_read(&ndentry->d_count) > 1))) { | |
6264d69d | 1716 | host_err = -EPERM; |
9079b1eb DH |
1717 | goto out_dput_new; |
1718 | } | |
1719 | ||
1720 | host_err = -EXDEV; | |
1721 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) | |
1722 | goto out_dput_new; | |
1723 | host_err = mnt_want_write(ffhp->fh_export->ex_path.mnt); | |
1724 | if (host_err) | |
1725 | goto out_dput_new; | |
1726 | ||
6264d69d AV |
1727 | host_err = vfs_rename(fdir, odentry, tdir, ndentry); |
1728 | if (!host_err && EX_ISSYNC(tfhp->fh_export)) { | |
1729 | host_err = nfsd_sync_dir(tdentry); | |
1730 | if (!host_err) | |
1731 | host_err = nfsd_sync_dir(fdentry); | |
1da177e4 LT |
1732 | } |
1733 | ||
9079b1eb DH |
1734 | mnt_drop_write(ffhp->fh_export->ex_path.mnt); |
1735 | ||
1da177e4 LT |
1736 | out_dput_new: |
1737 | dput(ndentry); | |
1738 | out_dput_old: | |
1739 | dput(odentry); | |
1740 | out_nfserr: | |
6264d69d | 1741 | err = nfserrno(host_err); |
1da177e4 LT |
1742 | |
1743 | /* we cannot reply on fh_unlock on the two filehandles, | |
1744 | * as that would do the wrong thing if the two directories | |
1745 | * were the same, so again we do it by hand | |
1746 | */ | |
1747 | fill_post_wcc(ffhp); | |
1748 | fill_post_wcc(tfhp); | |
1749 | unlock_rename(tdentry, fdentry); | |
1750 | ffhp->fh_locked = tfhp->fh_locked = 0; | |
1751 | ||
1752 | out: | |
1753 | return err; | |
1754 | } | |
1755 | ||
1756 | /* | |
1757 | * Unlink a file or directory | |
1758 | * N.B. After this call fhp needs an fh_put | |
1759 | */ | |
6264d69d | 1760 | __be32 |
1da177e4 LT |
1761 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1762 | char *fname, int flen) | |
1763 | { | |
1764 | struct dentry *dentry, *rdentry; | |
1765 | struct inode *dirp; | |
6264d69d AV |
1766 | __be32 err; |
1767 | int host_err; | |
1da177e4 LT |
1768 | |
1769 | err = nfserr_acces; | |
1770 | if (!flen || isdotent(fname, flen)) | |
1771 | goto out; | |
1772 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE); | |
1773 | if (err) | |
1774 | goto out; | |
1775 | ||
12fd3520 | 1776 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1777 | dentry = fhp->fh_dentry; |
1778 | dirp = dentry->d_inode; | |
1779 | ||
1780 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1781 | host_err = PTR_ERR(rdentry); |
1da177e4 LT |
1782 | if (IS_ERR(rdentry)) |
1783 | goto out_nfserr; | |
1784 | ||
1785 | if (!rdentry->d_inode) { | |
1786 | dput(rdentry); | |
1787 | err = nfserr_noent; | |
1788 | goto out; | |
1789 | } | |
1790 | ||
1791 | if (!type) | |
1792 | type = rdentry->d_inode->i_mode & S_IFMT; | |
1793 | ||
0622753b DH |
1794 | host_err = mnt_want_write(fhp->fh_export->ex_path.mnt); |
1795 | if (host_err) | |
1796 | goto out_nfserr; | |
1797 | ||
1da177e4 LT |
1798 | if (type != S_IFDIR) { /* It's UNLINK */ |
1799 | #ifdef MSNFS | |
1800 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && | |
1801 | (atomic_read(&rdentry->d_count) > 1)) { | |
6264d69d | 1802 | host_err = -EPERM; |
1da177e4 LT |
1803 | } else |
1804 | #endif | |
6264d69d | 1805 | host_err = vfs_unlink(dirp, rdentry); |
1da177e4 | 1806 | } else { /* It's RMDIR */ |
6264d69d | 1807 | host_err = vfs_rmdir(dirp, rdentry); |
1da177e4 LT |
1808 | } |
1809 | ||
1810 | dput(rdentry); | |
1811 | ||
6264d69d | 1812 | if (host_err) |
0622753b | 1813 | goto out_drop; |
6264d69d AV |
1814 | if (EX_ISSYNC(fhp->fh_export)) |
1815 | host_err = nfsd_sync_dir(dentry); | |
1da177e4 | 1816 | |
0622753b DH |
1817 | out_drop: |
1818 | mnt_drop_write(fhp->fh_export->ex_path.mnt); | |
1da177e4 | 1819 | out_nfserr: |
6264d69d | 1820 | err = nfserrno(host_err); |
f193fbab YT |
1821 | out: |
1822 | return err; | |
1da177e4 LT |
1823 | } |
1824 | ||
1825 | /* | |
1826 | * Read entries from a directory. | |
1827 | * The NFSv3/4 verifier we ignore for now. | |
1828 | */ | |
6264d69d | 1829 | __be32 |
1da177e4 | 1830 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
a0ad13ef | 1831 | struct readdir_cd *cdp, filldir_t func) |
1da177e4 | 1832 | { |
6264d69d AV |
1833 | __be32 err; |
1834 | int host_err; | |
1da177e4 LT |
1835 | struct file *file; |
1836 | loff_t offset = *offsetp; | |
1837 | ||
1838 | err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file); | |
1839 | if (err) | |
1840 | goto out; | |
1841 | ||
1842 | offset = vfs_llseek(file, offset, 0); | |
1843 | if (offset < 0) { | |
1844 | err = nfserrno((int)offset); | |
1845 | goto out_close; | |
1846 | } | |
1847 | ||
1848 | /* | |
1849 | * Read the directory entries. This silly loop is necessary because | |
1850 | * readdir() is not guaranteed to fill up the entire buffer, but | |
1851 | * may choose to do less. | |
1852 | */ | |
1853 | ||
1854 | do { | |
1855 | cdp->err = nfserr_eof; /* will be cleared on successful read */ | |
a0ad13ef | 1856 | host_err = vfs_readdir(file, func, cdp); |
6264d69d AV |
1857 | } while (host_err >=0 && cdp->err == nfs_ok); |
1858 | if (host_err) | |
1859 | err = nfserrno(host_err); | |
1da177e4 LT |
1860 | else |
1861 | err = cdp->err; | |
1862 | *offsetp = vfs_llseek(file, 0, 1); | |
1863 | ||
1864 | if (err == nfserr_eof || err == nfserr_toosmall) | |
1865 | err = nfs_ok; /* can still be found in ->err */ | |
1866 | out_close: | |
1867 | nfsd_close(file); | |
1868 | out: | |
1869 | return err; | |
1870 | } | |
1871 | ||
1872 | /* | |
1873 | * Get file system stats | |
1874 | * N.B. After this call fhp needs an fh_put | |
1875 | */ | |
6264d69d | 1876 | __be32 |
1da177e4 LT |
1877 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) |
1878 | { | |
6264d69d | 1879 | __be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP); |
726c3342 | 1880 | if (!err && vfs_statfs(fhp->fh_dentry,stat)) |
1da177e4 LT |
1881 | err = nfserr_io; |
1882 | return err; | |
1883 | } | |
1884 | ||
c7d51402 | 1885 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
e22841c6 | 1886 | { |
c7d51402 | 1887 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
e22841c6 BF |
1888 | } |
1889 | ||
1da177e4 LT |
1890 | /* |
1891 | * Check for a user's access permissions to this inode. | |
1892 | */ | |
6264d69d | 1893 | __be32 |
0ec757df BF |
1894 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
1895 | struct dentry *dentry, int acc) | |
1da177e4 LT |
1896 | { |
1897 | struct inode *inode = dentry->d_inode; | |
1898 | int err; | |
1899 | ||
1900 | if (acc == MAY_NOP) | |
1901 | return 0; | |
1902 | #if 0 | |
1903 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
1904 | acc, | |
1905 | (acc & MAY_READ)? " read" : "", | |
1906 | (acc & MAY_WRITE)? " write" : "", | |
1907 | (acc & MAY_EXEC)? " exec" : "", | |
1908 | (acc & MAY_SATTR)? " sattr" : "", | |
1909 | (acc & MAY_TRUNC)? " trunc" : "", | |
1910 | (acc & MAY_LOCK)? " lock" : "", | |
1911 | (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1912 | inode->i_mode, | |
1913 | IS_IMMUTABLE(inode)? " immut" : "", | |
1914 | IS_APPEND(inode)? " append" : "", | |
1915 | IS_RDONLY(inode)? " ro" : ""); | |
1916 | dprintk(" owner %d/%d user %d/%d\n", | |
1917 | inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); | |
1918 | #endif | |
1919 | ||
1920 | /* Normally we reject any write/sattr etc access on a read-only file | |
1921 | * system. But if it is IRIX doing check on write-access for a | |
1922 | * device special file, we ignore rofs. | |
1923 | */ | |
1924 | if (!(acc & MAY_LOCAL_ACCESS)) | |
1925 | if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) { | |
c7d51402 | 1926 | if (exp_rdonly(rqstp, exp) || IS_RDONLY(inode)) |
1da177e4 LT |
1927 | return nfserr_rofs; |
1928 | if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode)) | |
1929 | return nfserr_perm; | |
1930 | } | |
1931 | if ((acc & MAY_TRUNC) && IS_APPEND(inode)) | |
1932 | return nfserr_perm; | |
1933 | ||
1934 | if (acc & MAY_LOCK) { | |
1935 | /* If we cannot rely on authentication in NLM requests, | |
1936 | * just allow locks, otherwise require read permission, or | |
1937 | * ownership | |
1938 | */ | |
1939 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
1940 | return 0; | |
1941 | else | |
1942 | acc = MAY_READ | MAY_OWNER_OVERRIDE; | |
1943 | } | |
1944 | /* | |
1945 | * The file owner always gets access permission for accesses that | |
1946 | * would normally be checked at open time. This is to make | |
1947 | * file access work even when the client has done a fchmod(fd, 0). | |
1948 | * | |
1949 | * However, `cp foo bar' should fail nevertheless when bar is | |
1950 | * readonly. A sensible way to do this might be to reject all | |
1951 | * attempts to truncate a read-only file, because a creat() call | |
1952 | * always implies file truncation. | |
1953 | * ... but this isn't really fair. A process may reasonably call | |
1954 | * ftruncate on an open file descriptor on a file with perm 000. | |
1955 | * We must trust the client to do permission checking - using "ACCESS" | |
1956 | * with NFSv3. | |
1957 | */ | |
1958 | if ((acc & MAY_OWNER_OVERRIDE) && | |
1959 | inode->i_uid == current->fsuid) | |
1960 | return 0; | |
1961 | ||
1962 | err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL); | |
1963 | ||
1964 | /* Allow read access to binaries even when mode 111 */ | |
1965 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
1966 | acc == (MAY_READ | MAY_OWNER_OVERRIDE)) | |
1967 | err = permission(inode, MAY_EXEC, NULL); | |
1968 | ||
1969 | return err? nfserrno(err) : 0; | |
1970 | } | |
1971 | ||
1972 | void | |
1973 | nfsd_racache_shutdown(void) | |
1974 | { | |
fce1456a | 1975 | if (!raparml) |
1da177e4 LT |
1976 | return; |
1977 | dprintk("nfsd: freeing readahead buffers.\n"); | |
1978 | kfree(raparml); | |
fce1456a | 1979 | raparml = NULL; |
1da177e4 LT |
1980 | } |
1981 | /* | |
1982 | * Initialize readahead param cache | |
1983 | */ | |
1984 | int | |
1985 | nfsd_racache_init(int cache_size) | |
1986 | { | |
1987 | int i; | |
fce1456a GB |
1988 | int j = 0; |
1989 | int nperbucket; | |
1da177e4 | 1990 | |
fce1456a GB |
1991 | |
1992 | if (raparml) | |
1da177e4 | 1993 | return 0; |
fce1456a GB |
1994 | if (cache_size < 2*RAPARM_HASH_SIZE) |
1995 | cache_size = 2*RAPARM_HASH_SIZE; | |
4b3bb06b YB |
1996 | raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL); |
1997 | ||
1998 | if (!raparml) { | |
1da177e4 | 1999 | printk(KERN_WARNING |
4b3bb06b | 2000 | "nfsd: Could not allocate memory read-ahead cache.\n"); |
1da177e4 LT |
2001 | return -ENOMEM; |
2002 | } | |
4b3bb06b YB |
2003 | |
2004 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); | |
2005 | for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) { | |
2006 | raparm_hash[i].pb_head = NULL; | |
2007 | spin_lock_init(&raparm_hash[i].pb_lock); | |
2008 | } | |
a280df32 | 2009 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
4b3bb06b YB |
2010 | for (i = 0; i < cache_size - 1; i++) { |
2011 | if (i % nperbucket == 0) | |
2012 | raparm_hash[j++].pb_head = raparml + i; | |
2013 | if (i % nperbucket < nperbucket-1) | |
2014 | raparml[i].p_next = raparml + i + 1; | |
2015 | } | |
2016 | ||
1da177e4 LT |
2017 | nfsdstats.ra_size = cache_size; |
2018 | return 0; | |
2019 | } | |
a257cdd0 AG |
2020 | |
2021 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
2022 | struct posix_acl * | |
2023 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) | |
2024 | { | |
2025 | struct inode *inode = fhp->fh_dentry->d_inode; | |
2026 | char *name; | |
2027 | void *value = NULL; | |
2028 | ssize_t size; | |
2029 | struct posix_acl *acl; | |
2030 | ||
5be196e5 CH |
2031 | if (!IS_POSIXACL(inode)) |
2032 | return ERR_PTR(-EOPNOTSUPP); | |
2033 | ||
2034 | switch (type) { | |
2035 | case ACL_TYPE_ACCESS: | |
2036 | name = POSIX_ACL_XATTR_ACCESS; | |
2037 | break; | |
2038 | case ACL_TYPE_DEFAULT: | |
2039 | name = POSIX_ACL_XATTR_DEFAULT; | |
2040 | break; | |
2041 | default: | |
a257cdd0 | 2042 | return ERR_PTR(-EOPNOTSUPP); |
a257cdd0 AG |
2043 | } |
2044 | ||
5be196e5 CH |
2045 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
2046 | if (size < 0) | |
2047 | return ERR_PTR(size); | |
a257cdd0 | 2048 | |
a257cdd0 | 2049 | acl = posix_acl_from_xattr(value, size); |
a257cdd0 AG |
2050 | kfree(value); |
2051 | return acl; | |
2052 | } | |
2053 | ||
2054 | int | |
2055 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) | |
2056 | { | |
2057 | struct inode *inode = fhp->fh_dentry->d_inode; | |
2058 | char *name; | |
2059 | void *value = NULL; | |
2060 | size_t size; | |
2061 | int error; | |
2062 | ||
2063 | if (!IS_POSIXACL(inode) || !inode->i_op || | |
2064 | !inode->i_op->setxattr || !inode->i_op->removexattr) | |
2065 | return -EOPNOTSUPP; | |
2066 | switch(type) { | |
2067 | case ACL_TYPE_ACCESS: | |
334a13ec | 2068 | name = POSIX_ACL_XATTR_ACCESS; |
a257cdd0 AG |
2069 | break; |
2070 | case ACL_TYPE_DEFAULT: | |
334a13ec | 2071 | name = POSIX_ACL_XATTR_DEFAULT; |
a257cdd0 AG |
2072 | break; |
2073 | default: | |
2074 | return -EOPNOTSUPP; | |
2075 | } | |
2076 | ||
2077 | if (acl && acl->a_count) { | |
334a13ec | 2078 | size = posix_acl_xattr_size(acl->a_count); |
a257cdd0 AG |
2079 | value = kmalloc(size, GFP_KERNEL); |
2080 | if (!value) | |
2081 | return -ENOMEM; | |
9ccfc29c FM |
2082 | error = posix_acl_to_xattr(acl, value, size); |
2083 | if (error < 0) | |
a257cdd0 | 2084 | goto getout; |
9ccfc29c | 2085 | size = error; |
a257cdd0 AG |
2086 | } else |
2087 | size = 0; | |
2088 | ||
18f335af DH |
2089 | error = mnt_want_write(fhp->fh_export->ex_path.mnt); |
2090 | if (error) | |
2091 | goto getout; | |
a257cdd0 | 2092 | if (size) |
5be196e5 | 2093 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
a257cdd0 AG |
2094 | else { |
2095 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) | |
2096 | error = 0; | |
2097 | else { | |
5be196e5 | 2098 | error = vfs_removexattr(fhp->fh_dentry, name); |
a257cdd0 AG |
2099 | if (error == -ENODATA) |
2100 | error = 0; | |
2101 | } | |
2102 | } | |
18f335af | 2103 | mnt_drop_write(fhp->fh_export->ex_path.mnt); |
a257cdd0 AG |
2104 | |
2105 | getout: | |
2106 | kfree(value); | |
2107 | return error; | |
2108 | } | |
2109 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |