Commit | Line | Data |
---|---|---|
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> | |
cf8208d0 | 26 | #include <linux/pipe_fs_i.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 | ||
64 | /* We must ignore files (but only files) which might have mandatory | |
65 | * locks on them because there is no way to know if the accesser has | |
66 | * the lock. | |
67 | */ | |
68 | #define IS_ISMNDLK(i) (S_ISREG((i)->i_mode) && MANDATORY_LOCK(i)) | |
69 | ||
70 | /* | |
71 | * This is a cache of readahead params that help us choose the proper | |
72 | * readahead strategy. Initially, we set all readahead parameters to 0 | |
73 | * and let the VFS handle things. | |
74 | * If you increase the number of cached files very much, you'll need to | |
75 | * add a hash table here. | |
76 | */ | |
77 | struct raparms { | |
78 | struct raparms *p_next; | |
79 | unsigned int p_count; | |
80 | ino_t p_ino; | |
81 | dev_t p_dev; | |
82 | int p_set; | |
83 | struct file_ra_state p_ra; | |
fce1456a | 84 | unsigned int p_hindex; |
1da177e4 LT |
85 | }; |
86 | ||
fce1456a GB |
87 | struct raparm_hbucket { |
88 | struct raparms *pb_head; | |
89 | spinlock_t pb_lock; | |
90 | } ____cacheline_aligned_in_smp; | |
91 | ||
1da177e4 | 92 | static struct raparms * raparml; |
fce1456a GB |
93 | #define RAPARM_HASH_BITS 4 |
94 | #define RAPARM_HASH_SIZE (1<<RAPARM_HASH_BITS) | |
95 | #define RAPARM_HASH_MASK (RAPARM_HASH_SIZE-1) | |
96 | static struct raparm_hbucket raparm_hash[RAPARM_HASH_SIZE]; | |
1da177e4 LT |
97 | |
98 | /* | |
99 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed | |
100 | * a mount point. | |
e0bb89ef | 101 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
1da177e4 LT |
102 | * or nfs_ok having possibly changed *dpp and *expp |
103 | */ | |
104 | int | |
105 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, | |
106 | struct svc_export **expp) | |
107 | { | |
108 | struct svc_export *exp = *expp, *exp2 = NULL; | |
109 | struct dentry *dentry = *dpp; | |
110 | struct vfsmount *mnt = mntget(exp->ex_mnt); | |
111 | struct dentry *mounts = dget(dentry); | |
6264d69d | 112 | int err = 0; |
1da177e4 LT |
113 | |
114 | while (follow_down(&mnt,&mounts)&&d_mountpoint(mounts)); | |
115 | ||
116 | exp2 = exp_get_by_name(exp->ex_client, mnt, mounts, &rqstp->rq_chandle); | |
117 | if (IS_ERR(exp2)) { | |
118 | err = PTR_ERR(exp2); | |
119 | dput(mounts); | |
120 | mntput(mnt); | |
121 | goto out; | |
122 | } | |
123 | if (exp2 && ((exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2))) { | |
124 | /* successfully crossed mount point */ | |
125 | exp_put(exp); | |
126 | *expp = exp2; | |
127 | dput(dentry); | |
128 | *dpp = mounts; | |
129 | } else { | |
130 | if (exp2) exp_put(exp2); | |
131 | dput(mounts); | |
132 | } | |
133 | mntput(mnt); | |
134 | out: | |
135 | return err; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Look up one component of a pathname. | |
140 | * N.B. After this call _both_ fhp and resfh need an fh_put | |
141 | * | |
142 | * If the lookup would cross a mountpoint, and the mounted filesystem | |
143 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is | |
144 | * accepted as it stands and the mounted directory is | |
145 | * returned. Otherwise the covered directory is returned. | |
146 | * NOTE: this mountpoint crossing is not supported properly by all | |
147 | * clients and is explicitly disallowed for NFSv3 | |
148 | * NeilBrown <neilb@cse.unsw.edu.au> | |
149 | */ | |
6264d69d | 150 | __be32 |
1da177e4 LT |
151 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, |
152 | int len, struct svc_fh *resfh) | |
153 | { | |
154 | struct svc_export *exp; | |
155 | struct dentry *dparent; | |
156 | struct dentry *dentry; | |
6264d69d AV |
157 | __be32 err; |
158 | int host_err; | |
1da177e4 LT |
159 | |
160 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); | |
161 | ||
162 | /* Obtain dentry and export. */ | |
163 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_EXEC); | |
164 | if (err) | |
165 | return err; | |
166 | ||
167 | dparent = fhp->fh_dentry; | |
168 | exp = fhp->fh_export; | |
169 | exp_get(exp); | |
170 | ||
171 | err = nfserr_acces; | |
172 | ||
173 | /* Lookup the name, but don't follow links */ | |
174 | if (isdotent(name, len)) { | |
175 | if (len==1) | |
176 | dentry = dget(dparent); | |
177 | else if (dparent != exp->ex_dentry) { | |
178 | dentry = dget_parent(dparent); | |
179 | } else if (!EX_NOHIDE(exp)) | |
180 | dentry = dget(dparent); /* .. == . just like at / */ | |
181 | else { | |
182 | /* checking mountpoint crossing is very different when stepping up */ | |
183 | struct svc_export *exp2 = NULL; | |
184 | struct dentry *dp; | |
185 | struct vfsmount *mnt = mntget(exp->ex_mnt); | |
186 | dentry = dget(dparent); | |
187 | while(dentry == mnt->mnt_root && follow_up(&mnt, &dentry)) | |
188 | ; | |
189 | dp = dget_parent(dentry); | |
190 | dput(dentry); | |
191 | dentry = dp; | |
192 | ||
193 | exp2 = exp_parent(exp->ex_client, mnt, dentry, | |
194 | &rqstp->rq_chandle); | |
195 | if (IS_ERR(exp2)) { | |
6264d69d | 196 | host_err = PTR_ERR(exp2); |
1da177e4 LT |
197 | dput(dentry); |
198 | mntput(mnt); | |
199 | goto out_nfserr; | |
200 | } | |
201 | if (!exp2) { | |
202 | dput(dentry); | |
203 | dentry = dget(dparent); | |
204 | } else { | |
205 | exp_put(exp); | |
206 | exp = exp2; | |
207 | } | |
208 | mntput(mnt); | |
209 | } | |
210 | } else { | |
211 | fh_lock(fhp); | |
212 | dentry = lookup_one_len(name, dparent, len); | |
6264d69d | 213 | host_err = PTR_ERR(dentry); |
1da177e4 LT |
214 | if (IS_ERR(dentry)) |
215 | goto out_nfserr; | |
216 | /* | |
217 | * check if we have crossed a mount point ... | |
218 | */ | |
219 | if (d_mountpoint(dentry)) { | |
6264d69d | 220 | if ((host_err = nfsd_cross_mnt(rqstp, &dentry, &exp))) { |
1da177e4 LT |
221 | dput(dentry); |
222 | goto out_nfserr; | |
223 | } | |
224 | } | |
225 | } | |
226 | /* | |
227 | * Note: we compose the file handle now, but as the | |
228 | * dentry may be negative, it may need to be updated. | |
229 | */ | |
230 | err = fh_compose(resfh, exp, dentry, fhp); | |
231 | if (!err && !dentry->d_inode) | |
232 | err = nfserr_noent; | |
233 | dput(dentry); | |
234 | out: | |
235 | exp_put(exp); | |
236 | return err; | |
237 | ||
238 | out_nfserr: | |
6264d69d | 239 | err = nfserrno(host_err); |
1da177e4 LT |
240 | goto out; |
241 | } | |
242 | ||
243 | /* | |
244 | * Set various file attributes. | |
245 | * N.B. After this call fhp needs an fh_put | |
246 | */ | |
6264d69d | 247 | __be32 |
1da177e4 LT |
248 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap, |
249 | int check_guard, time_t guardtime) | |
250 | { | |
251 | struct dentry *dentry; | |
252 | struct inode *inode; | |
253 | int accmode = MAY_SATTR; | |
254 | int ftype = 0; | |
255 | int imode; | |
6264d69d AV |
256 | __be32 err; |
257 | int host_err; | |
1da177e4 LT |
258 | int size_change = 0; |
259 | ||
260 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE)) | |
261 | accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE; | |
262 | if (iap->ia_valid & ATTR_SIZE) | |
263 | ftype = S_IFREG; | |
264 | ||
265 | /* Get inode */ | |
266 | err = fh_verify(rqstp, fhp, ftype, accmode); | |
15b7a1b8 | 267 | if (err) |
1da177e4 LT |
268 | goto out; |
269 | ||
270 | dentry = fhp->fh_dentry; | |
271 | inode = dentry->d_inode; | |
272 | ||
15b7a1b8 N |
273 | /* Ignore any mode updates on symlinks */ |
274 | if (S_ISLNK(inode->i_mode)) | |
275 | iap->ia_valid &= ~ATTR_MODE; | |
276 | ||
277 | if (!iap->ia_valid) | |
278 | goto out; | |
279 | ||
1da177e4 LT |
280 | /* NFSv2 does not differentiate between "set-[ac]time-to-now" |
281 | * which only requires access, and "set-[ac]time-to-X" which | |
282 | * requires ownership. | |
283 | * So if it looks like it might be "set both to the same time which | |
284 | * is close to now", and if inode_change_ok fails, then we | |
285 | * convert to "set to now" instead of "set to explicit time" | |
286 | * | |
287 | * We only call inode_change_ok as the last test as technically | |
288 | * it is not an interface that we should be using. It is only | |
289 | * valid if the filesystem does not define it's own i_op->setattr. | |
290 | */ | |
291 | #define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET) | |
292 | #define MAX_TOUCH_TIME_ERROR (30*60) | |
293 | if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET | |
294 | && iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec | |
295 | ) { | |
296 | /* Looks probable. Now just make sure time is in the right ballpark. | |
297 | * Solaris, at least, doesn't seem to care what the time request is. | |
298 | * We require it be within 30 minutes of now. | |
299 | */ | |
300 | time_t delta = iap->ia_atime.tv_sec - get_seconds(); | |
301 | if (delta<0) delta = -delta; | |
302 | if (delta < MAX_TOUCH_TIME_ERROR && | |
303 | inode_change_ok(inode, iap) != 0) { | |
304 | /* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME | |
305 | * this will cause notify_change to set these times to "now" | |
306 | */ | |
307 | iap->ia_valid &= ~BOTH_TIME_SET; | |
308 | } | |
309 | } | |
310 | ||
311 | /* The size case is special. It changes the file as well as the attributes. */ | |
312 | if (iap->ia_valid & ATTR_SIZE) { | |
313 | if (iap->ia_size < inode->i_size) { | |
314 | err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE); | |
315 | if (err) | |
316 | goto out; | |
317 | } | |
318 | ||
319 | /* | |
320 | * If we are changing the size of the file, then | |
321 | * we need to break all leases. | |
322 | */ | |
6264d69d AV |
323 | host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK); |
324 | if (host_err == -EWOULDBLOCK) | |
325 | host_err = -ETIMEDOUT; | |
326 | if (host_err) /* ENOMEM or EWOULDBLOCK */ | |
1da177e4 LT |
327 | goto out_nfserr; |
328 | ||
6264d69d AV |
329 | host_err = get_write_access(inode); |
330 | if (host_err) | |
1da177e4 LT |
331 | goto out_nfserr; |
332 | ||
333 | size_change = 1; | |
6264d69d AV |
334 | host_err = locks_verify_truncate(inode, NULL, iap->ia_size); |
335 | if (host_err) { | |
1da177e4 LT |
336 | put_write_access(inode); |
337 | goto out_nfserr; | |
338 | } | |
339 | DQUOT_INIT(inode); | |
340 | } | |
341 | ||
342 | imode = inode->i_mode; | |
343 | if (iap->ia_valid & ATTR_MODE) { | |
344 | iap->ia_mode &= S_IALLUGO; | |
345 | imode = iap->ia_mode |= (imode & ~S_IALLUGO); | |
346 | } | |
347 | ||
348 | /* Revoke setuid/setgid bit on chown/chgrp */ | |
349 | if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) | |
350 | iap->ia_valid |= ATTR_KILL_SUID; | |
351 | if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid) | |
352 | iap->ia_valid |= ATTR_KILL_SGID; | |
353 | ||
354 | /* Change the attributes. */ | |
355 | ||
356 | iap->ia_valid |= ATTR_CTIME; | |
357 | ||
358 | err = nfserr_notsync; | |
359 | if (!check_guard || guardtime == inode->i_ctime.tv_sec) { | |
360 | fh_lock(fhp); | |
6264d69d AV |
361 | host_err = notify_change(dentry, iap); |
362 | err = nfserrno(host_err); | |
1da177e4 LT |
363 | fh_unlock(fhp); |
364 | } | |
365 | if (size_change) | |
366 | put_write_access(inode); | |
367 | if (!err) | |
368 | if (EX_ISSYNC(fhp->fh_export)) | |
369 | write_inode_now(inode, 1); | |
370 | out: | |
371 | return err; | |
372 | ||
373 | out_nfserr: | |
6264d69d | 374 | err = nfserrno(host_err); |
1da177e4 LT |
375 | goto out; |
376 | } | |
377 | ||
5be196e5 CH |
378 | #if defined(CONFIG_NFSD_V2_ACL) || \ |
379 | defined(CONFIG_NFSD_V3_ACL) || \ | |
380 | defined(CONFIG_NFSD_V4) | |
381 | static ssize_t nfsd_getxattr(struct dentry *dentry, char *key, void **buf) | |
382 | { | |
383 | ssize_t buflen; | |
5be196e5 CH |
384 | |
385 | buflen = vfs_getxattr(dentry, key, NULL, 0); | |
386 | if (buflen <= 0) | |
387 | return buflen; | |
1da177e4 | 388 | |
5be196e5 CH |
389 | *buf = kmalloc(buflen, GFP_KERNEL); |
390 | if (!*buf) | |
391 | return -ENOMEM; | |
392 | ||
b5872b0d | 393 | return vfs_getxattr(dentry, key, *buf, buflen); |
5be196e5 CH |
394 | } |
395 | #endif | |
396 | ||
397 | #if defined(CONFIG_NFSD_V4) | |
1da177e4 LT |
398 | static int |
399 | set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key) | |
400 | { | |
401 | int len; | |
402 | size_t buflen; | |
403 | char *buf = NULL; | |
404 | int error = 0; | |
1da177e4 LT |
405 | |
406 | buflen = posix_acl_xattr_size(pacl->a_count); | |
407 | buf = kmalloc(buflen, GFP_KERNEL); | |
408 | error = -ENOMEM; | |
409 | if (buf == NULL) | |
410 | goto out; | |
411 | ||
412 | len = posix_acl_to_xattr(pacl, buf, buflen); | |
413 | if (len < 0) { | |
414 | error = len; | |
415 | goto out; | |
416 | } | |
417 | ||
5be196e5 | 418 | error = vfs_setxattr(dentry, key, buf, len, 0); |
1da177e4 LT |
419 | out: |
420 | kfree(buf); | |
421 | return error; | |
422 | } | |
423 | ||
6264d69d | 424 | __be32 |
1da177e4 LT |
425 | nfsd4_set_nfs4_acl(struct svc_rqst *rqstp, struct svc_fh *fhp, |
426 | struct nfs4_acl *acl) | |
427 | { | |
6264d69d AV |
428 | __be32 error; |
429 | int host_error; | |
1da177e4 LT |
430 | struct dentry *dentry; |
431 | struct inode *inode; | |
432 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
433 | unsigned int flags = 0; | |
434 | ||
435 | /* Get inode */ | |
436 | error = fh_verify(rqstp, fhp, 0 /* S_IFREG */, MAY_SATTR); | |
437 | if (error) | |
438 | goto out; | |
439 | ||
440 | dentry = fhp->fh_dentry; | |
441 | inode = dentry->d_inode; | |
442 | if (S_ISDIR(inode->i_mode)) | |
443 | flags = NFS4_ACL_DIR; | |
444 | ||
6264d69d AV |
445 | host_error = nfs4_acl_nfsv4_to_posix(acl, &pacl, &dpacl, flags); |
446 | if (host_error == -EINVAL) { | |
1da177e4 LT |
447 | error = nfserr_attrnotsupp; |
448 | goto out; | |
6264d69d | 449 | } else if (host_error < 0) |
1da177e4 LT |
450 | goto out_nfserr; |
451 | ||
6264d69d AV |
452 | host_error = set_nfsv4_acl_one(dentry, pacl, POSIX_ACL_XATTR_ACCESS); |
453 | if (host_error < 0) | |
b66285ce | 454 | goto out_nfserr; |
1da177e4 | 455 | |
b66285ce | 456 | if (S_ISDIR(inode->i_mode)) { |
6264d69d AV |
457 | host_error = set_nfsv4_acl_one(dentry, dpacl, POSIX_ACL_XATTR_DEFAULT); |
458 | if (host_error < 0) | |
1da177e4 LT |
459 | goto out_nfserr; |
460 | } | |
461 | ||
462 | error = nfs_ok; | |
463 | ||
464 | out: | |
465 | posix_acl_release(pacl); | |
466 | posix_acl_release(dpacl); | |
467 | return (error); | |
468 | out_nfserr: | |
f34f9242 BF |
469 | if (host_error == -EOPNOTSUPP) |
470 | error = nfserr_attrnotsupp; | |
471 | else | |
472 | error = nfserrno(host_error); | |
1da177e4 LT |
473 | goto out; |
474 | } | |
475 | ||
476 | static struct posix_acl * | |
477 | _get_posix_acl(struct dentry *dentry, char *key) | |
478 | { | |
5be196e5 | 479 | void *buf = NULL; |
1da177e4 | 480 | struct posix_acl *pacl = NULL; |
5be196e5 | 481 | int buflen; |
1da177e4 | 482 | |
5be196e5 CH |
483 | buflen = nfsd_getxattr(dentry, key, &buf); |
484 | if (!buflen) | |
485 | buflen = -ENODATA; | |
486 | if (buflen <= 0) | |
487 | return ERR_PTR(buflen); | |
1da177e4 LT |
488 | |
489 | pacl = posix_acl_from_xattr(buf, buflen); | |
1da177e4 LT |
490 | kfree(buf); |
491 | return pacl; | |
1da177e4 LT |
492 | } |
493 | ||
494 | int | |
495 | nfsd4_get_nfs4_acl(struct svc_rqst *rqstp, struct dentry *dentry, struct nfs4_acl **acl) | |
496 | { | |
497 | struct inode *inode = dentry->d_inode; | |
498 | int error = 0; | |
499 | struct posix_acl *pacl = NULL, *dpacl = NULL; | |
500 | unsigned int flags = 0; | |
501 | ||
9a59f452 | 502 | pacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_ACCESS); |
1da177e4 LT |
503 | if (IS_ERR(pacl) && PTR_ERR(pacl) == -ENODATA) |
504 | pacl = posix_acl_from_mode(inode->i_mode, GFP_KERNEL); | |
505 | if (IS_ERR(pacl)) { | |
506 | error = PTR_ERR(pacl); | |
507 | pacl = NULL; | |
508 | goto out; | |
509 | } | |
510 | ||
511 | if (S_ISDIR(inode->i_mode)) { | |
9a59f452 | 512 | dpacl = _get_posix_acl(dentry, POSIX_ACL_XATTR_DEFAULT); |
1da177e4 LT |
513 | if (IS_ERR(dpacl) && PTR_ERR(dpacl) == -ENODATA) |
514 | dpacl = NULL; | |
515 | else if (IS_ERR(dpacl)) { | |
516 | error = PTR_ERR(dpacl); | |
517 | dpacl = NULL; | |
518 | goto out; | |
519 | } | |
520 | flags = NFS4_ACL_DIR; | |
521 | } | |
522 | ||
523 | *acl = nfs4_acl_posix_to_nfsv4(pacl, dpacl, flags); | |
524 | if (IS_ERR(*acl)) { | |
525 | error = PTR_ERR(*acl); | |
526 | *acl = NULL; | |
527 | } | |
528 | out: | |
529 | posix_acl_release(pacl); | |
530 | posix_acl_release(dpacl); | |
531 | return error; | |
532 | } | |
533 | ||
534 | #endif /* defined(CONFIG_NFS_V4) */ | |
535 | ||
536 | #ifdef CONFIG_NFSD_V3 | |
537 | /* | |
538 | * Check server access rights to a file system object | |
539 | */ | |
540 | struct accessmap { | |
541 | u32 access; | |
542 | int how; | |
543 | }; | |
544 | static struct accessmap nfs3_regaccess[] = { | |
545 | { NFS3_ACCESS_READ, MAY_READ }, | |
546 | { NFS3_ACCESS_EXECUTE, MAY_EXEC }, | |
547 | { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_TRUNC }, | |
548 | { NFS3_ACCESS_EXTEND, MAY_WRITE }, | |
549 | ||
550 | { 0, 0 } | |
551 | }; | |
552 | ||
553 | static struct accessmap nfs3_diraccess[] = { | |
554 | { NFS3_ACCESS_READ, MAY_READ }, | |
555 | { NFS3_ACCESS_LOOKUP, MAY_EXEC }, | |
556 | { NFS3_ACCESS_MODIFY, MAY_EXEC|MAY_WRITE|MAY_TRUNC }, | |
557 | { NFS3_ACCESS_EXTEND, MAY_EXEC|MAY_WRITE }, | |
558 | { NFS3_ACCESS_DELETE, MAY_REMOVE }, | |
559 | ||
560 | { 0, 0 } | |
561 | }; | |
562 | ||
563 | static struct accessmap nfs3_anyaccess[] = { | |
564 | /* Some clients - Solaris 2.6 at least, make an access call | |
565 | * to the server to check for access for things like /dev/null | |
566 | * (which really, the server doesn't care about). So | |
567 | * We provide simple access checking for them, looking | |
568 | * mainly at mode bits, and we make sure to ignore read-only | |
569 | * filesystem checks | |
570 | */ | |
571 | { NFS3_ACCESS_READ, MAY_READ }, | |
572 | { NFS3_ACCESS_EXECUTE, MAY_EXEC }, | |
573 | { NFS3_ACCESS_MODIFY, MAY_WRITE|MAY_LOCAL_ACCESS }, | |
574 | { NFS3_ACCESS_EXTEND, MAY_WRITE|MAY_LOCAL_ACCESS }, | |
575 | ||
576 | { 0, 0 } | |
577 | }; | |
578 | ||
6264d69d | 579 | __be32 |
1da177e4 LT |
580 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
581 | { | |
582 | struct accessmap *map; | |
583 | struct svc_export *export; | |
584 | struct dentry *dentry; | |
585 | u32 query, result = 0, sresult = 0; | |
6264d69d | 586 | __be32 error; |
1da177e4 LT |
587 | |
588 | error = fh_verify(rqstp, fhp, 0, MAY_NOP); | |
589 | if (error) | |
590 | goto out; | |
591 | ||
592 | export = fhp->fh_export; | |
593 | dentry = fhp->fh_dentry; | |
594 | ||
595 | if (S_ISREG(dentry->d_inode->i_mode)) | |
596 | map = nfs3_regaccess; | |
597 | else if (S_ISDIR(dentry->d_inode->i_mode)) | |
598 | map = nfs3_diraccess; | |
599 | else | |
600 | map = nfs3_anyaccess; | |
601 | ||
602 | ||
603 | query = *access; | |
604 | for (; map->access; map++) { | |
605 | if (map->access & query) { | |
6264d69d | 606 | __be32 err2; |
1da177e4 LT |
607 | |
608 | sresult |= map->access; | |
609 | ||
610 | err2 = nfsd_permission(export, dentry, map->how); | |
611 | switch (err2) { | |
612 | case nfs_ok: | |
613 | result |= map->access; | |
614 | break; | |
615 | ||
616 | /* the following error codes just mean the access was not allowed, | |
617 | * rather than an error occurred */ | |
618 | case nfserr_rofs: | |
619 | case nfserr_acces: | |
620 | case nfserr_perm: | |
621 | /* simply don't "or" in the access bit. */ | |
622 | break; | |
623 | default: | |
624 | error = err2; | |
625 | goto out; | |
626 | } | |
627 | } | |
628 | } | |
629 | *access = result; | |
630 | if (supported) | |
631 | *supported = sresult; | |
632 | ||
633 | out: | |
634 | return error; | |
635 | } | |
636 | #endif /* CONFIG_NFSD_V3 */ | |
637 | ||
638 | ||
639 | ||
640 | /* | |
641 | * Open an existing file or directory. | |
642 | * The access argument indicates the type of open (read/write/lock) | |
643 | * N.B. After this call fhp needs an fh_put | |
644 | */ | |
6264d69d | 645 | __be32 |
1da177e4 LT |
646 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
647 | int access, struct file **filp) | |
648 | { | |
649 | struct dentry *dentry; | |
650 | struct inode *inode; | |
6264d69d AV |
651 | int flags = O_RDONLY|O_LARGEFILE; |
652 | __be32 err; | |
653 | int host_err; | |
1da177e4 LT |
654 | |
655 | /* | |
656 | * If we get here, then the client has already done an "open", | |
657 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE | |
658 | * in case a chmod has now revoked permission. | |
659 | */ | |
660 | err = fh_verify(rqstp, fhp, type, access | MAY_OWNER_OVERRIDE); | |
661 | if (err) | |
662 | goto out; | |
663 | ||
664 | dentry = fhp->fh_dentry; | |
665 | inode = dentry->d_inode; | |
666 | ||
667 | /* Disallow write access to files with the append-only bit set | |
668 | * or any access when mandatory locking enabled | |
669 | */ | |
670 | err = nfserr_perm; | |
671 | if (IS_APPEND(inode) && (access & MAY_WRITE)) | |
672 | goto out; | |
673 | if (IS_ISMNDLK(inode)) | |
674 | goto out; | |
675 | ||
676 | if (!inode->i_fop) | |
677 | goto out; | |
678 | ||
679 | /* | |
680 | * Check to see if there are any leases on this file. | |
681 | * This may block while leases are broken. | |
682 | */ | |
6264d69d AV |
683 | host_err = break_lease(inode, O_NONBLOCK | ((access & MAY_WRITE) ? FMODE_WRITE : 0)); |
684 | if (host_err == -EWOULDBLOCK) | |
685 | host_err = -ETIMEDOUT; | |
686 | if (host_err) /* NOMEM or WOULDBLOCK */ | |
1da177e4 LT |
687 | goto out_nfserr; |
688 | ||
689 | if (access & MAY_WRITE) { | |
9ecb6a08 BF |
690 | if (access & MAY_READ) |
691 | flags = O_RDWR|O_LARGEFILE; | |
692 | else | |
693 | flags = O_WRONLY|O_LARGEFILE; | |
1da177e4 LT |
694 | |
695 | DQUOT_INIT(inode); | |
696 | } | |
697 | *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags); | |
698 | if (IS_ERR(*filp)) | |
6264d69d | 699 | host_err = PTR_ERR(*filp); |
1da177e4 | 700 | out_nfserr: |
6264d69d | 701 | err = nfserrno(host_err); |
1da177e4 LT |
702 | out: |
703 | return err; | |
704 | } | |
705 | ||
706 | /* | |
707 | * Close a file. | |
708 | */ | |
709 | void | |
710 | nfsd_close(struct file *filp) | |
711 | { | |
712 | fput(filp); | |
713 | } | |
714 | ||
715 | /* | |
716 | * Sync a file | |
717 | * As this calls fsync (not fdatasync) there is no need for a write_inode | |
718 | * after it. | |
719 | */ | |
a334de28 | 720 | static inline int nfsd_dosync(struct file *filp, struct dentry *dp, |
99ac48f5 | 721 | const struct file_operations *fop) |
1da177e4 LT |
722 | { |
723 | struct inode *inode = dp->d_inode; | |
724 | int (*fsync) (struct file *, struct dentry *, int); | |
f193fbab | 725 | int err; |
1da177e4 | 726 | |
f193fbab YT |
727 | err = filemap_fdatawrite(inode->i_mapping); |
728 | if (err == 0 && fop && (fsync = fop->fsync)) | |
729 | err = fsync(filp, dp, 0); | |
730 | if (err == 0) | |
731 | err = filemap_fdatawait(inode->i_mapping); | |
a334de28 | 732 | |
f193fbab | 733 | return err; |
1da177e4 LT |
734 | } |
735 | ||
736 | ||
a334de28 | 737 | static int |
1da177e4 LT |
738 | nfsd_sync(struct file *filp) |
739 | { | |
a334de28 | 740 | int err; |
7eaa36e2 JJS |
741 | struct inode *inode = filp->f_path.dentry->d_inode; |
742 | dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name); | |
1b1dcc1b | 743 | mutex_lock(&inode->i_mutex); |
7eaa36e2 | 744 | err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op); |
1b1dcc1b | 745 | mutex_unlock(&inode->i_mutex); |
a334de28 DS |
746 | |
747 | return err; | |
1da177e4 LT |
748 | } |
749 | ||
f193fbab | 750 | int |
1da177e4 LT |
751 | nfsd_sync_dir(struct dentry *dp) |
752 | { | |
f193fbab | 753 | return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); |
1da177e4 LT |
754 | } |
755 | ||
756 | /* | |
757 | * Obtain the readahead parameters for the file | |
758 | * specified by (dev, ino). | |
759 | */ | |
1da177e4 LT |
760 | |
761 | static inline struct raparms * | |
762 | nfsd_get_raparms(dev_t dev, ino_t ino) | |
763 | { | |
764 | struct raparms *ra, **rap, **frap = NULL; | |
765 | int depth = 0; | |
fce1456a GB |
766 | unsigned int hash; |
767 | struct raparm_hbucket *rab; | |
768 | ||
769 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; | |
770 | rab = &raparm_hash[hash]; | |
1da177e4 | 771 | |
fce1456a GB |
772 | spin_lock(&rab->pb_lock); |
773 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { | |
1da177e4 LT |
774 | if (ra->p_ino == ino && ra->p_dev == dev) |
775 | goto found; | |
776 | depth++; | |
777 | if (ra->p_count == 0) | |
778 | frap = rap; | |
779 | } | |
780 | depth = nfsdstats.ra_size*11/10; | |
781 | if (!frap) { | |
fce1456a | 782 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
783 | return NULL; |
784 | } | |
785 | rap = frap; | |
786 | ra = *frap; | |
787 | ra->p_dev = dev; | |
788 | ra->p_ino = ino; | |
789 | ra->p_set = 0; | |
fce1456a | 790 | ra->p_hindex = hash; |
1da177e4 | 791 | found: |
fce1456a | 792 | if (rap != &rab->pb_head) { |
1da177e4 | 793 | *rap = ra->p_next; |
fce1456a GB |
794 | ra->p_next = rab->pb_head; |
795 | rab->pb_head = ra; | |
1da177e4 LT |
796 | } |
797 | ra->p_count++; | |
798 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; | |
fce1456a | 799 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
800 | return ra; |
801 | } | |
802 | ||
803 | /* | |
cf8208d0 JA |
804 | * Grab and keep cached pages associated with a file in the svc_rqst |
805 | * so that they can be passed to the network sendmsg/sendpage routines | |
806 | * directly. They will be released after the sending has completed. | |
1da177e4 LT |
807 | */ |
808 | static int | |
cf8208d0 JA |
809 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
810 | struct splice_desc *sd) | |
1da177e4 | 811 | { |
cf8208d0 | 812 | struct svc_rqst *rqstp = sd->u.data; |
44524359 | 813 | struct page **pp = rqstp->rq_respages + rqstp->rq_resused; |
cf8208d0 JA |
814 | struct page *page = buf->page; |
815 | size_t size; | |
816 | int ret; | |
1da177e4 | 817 | |
cf8208d0 JA |
818 | ret = buf->ops->pin(pipe, buf); |
819 | if (unlikely(ret)) | |
820 | return ret; | |
821 | ||
822 | size = sd->len; | |
1da177e4 LT |
823 | |
824 | if (rqstp->rq_res.page_len == 0) { | |
825 | get_page(page); | |
44524359 N |
826 | put_page(*pp); |
827 | *pp = page; | |
828 | rqstp->rq_resused++; | |
cf8208d0 | 829 | rqstp->rq_res.page_base = buf->offset; |
1da177e4 | 830 | rqstp->rq_res.page_len = size; |
44524359 | 831 | } else if (page != pp[-1]) { |
1da177e4 | 832 | get_page(page); |
250f3915 N |
833 | if (*pp) |
834 | put_page(*pp); | |
44524359 N |
835 | *pp = page; |
836 | rqstp->rq_resused++; | |
1da177e4 | 837 | rqstp->rq_res.page_len += size; |
44524359 | 838 | } else |
1da177e4 | 839 | rqstp->rq_res.page_len += size; |
1da177e4 | 840 | |
1da177e4 LT |
841 | return size; |
842 | } | |
843 | ||
cf8208d0 JA |
844 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
845 | struct splice_desc *sd) | |
846 | { | |
847 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
848 | } | |
849 | ||
6264d69d | 850 | static __be32 |
1da177e4 LT |
851 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
852 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) | |
853 | { | |
854 | struct inode *inode; | |
855 | struct raparms *ra; | |
856 | mm_segment_t oldfs; | |
6264d69d AV |
857 | __be32 err; |
858 | int host_err; | |
1da177e4 LT |
859 | |
860 | err = nfserr_perm; | |
7eaa36e2 | 861 | inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
862 | #ifdef MSNFS |
863 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && | |
864 | (!lock_may_read(inode, offset, *count))) | |
865 | goto out; | |
866 | #endif | |
867 | ||
868 | /* Get readahead parameters */ | |
869 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); | |
870 | ||
871 | if (ra && ra->p_set) | |
872 | file->f_ra = ra->p_ra; | |
873 | ||
cf8208d0 JA |
874 | if (file->f_op->splice_read && rqstp->rq_splice_ok) { |
875 | struct splice_desc sd = { | |
876 | .len = 0, | |
877 | .total_len = *count, | |
878 | .pos = offset, | |
879 | .u.data = rqstp, | |
880 | }; | |
881 | ||
882 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); | |
1da177e4 LT |
883 | } else { |
884 | oldfs = get_fs(); | |
885 | set_fs(KERNEL_DS); | |
6264d69d | 886 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
1da177e4 LT |
887 | set_fs(oldfs); |
888 | } | |
889 | ||
890 | /* Write back readahead params */ | |
891 | if (ra) { | |
fce1456a GB |
892 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; |
893 | spin_lock(&rab->pb_lock); | |
1da177e4 LT |
894 | ra->p_ra = file->f_ra; |
895 | ra->p_set = 1; | |
896 | ra->p_count--; | |
fce1456a | 897 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
898 | } |
899 | ||
6264d69d AV |
900 | if (host_err >= 0) { |
901 | nfsdstats.io_read += host_err; | |
902 | *count = host_err; | |
1da177e4 | 903 | err = 0; |
7eaa36e2 | 904 | fsnotify_access(file->f_path.dentry); |
1da177e4 | 905 | } else |
6264d69d | 906 | err = nfserrno(host_err); |
1da177e4 LT |
907 | out: |
908 | return err; | |
909 | } | |
910 | ||
9f708e40 NB |
911 | static void kill_suid(struct dentry *dentry) |
912 | { | |
913 | struct iattr ia; | |
914 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID; | |
915 | ||
1b1dcc1b | 916 | mutex_lock(&dentry->d_inode->i_mutex); |
9f708e40 | 917 | notify_change(dentry, &ia); |
1b1dcc1b | 918 | mutex_unlock(&dentry->d_inode->i_mutex); |
9f708e40 NB |
919 | } |
920 | ||
6264d69d | 921 | static __be32 |
1da177e4 LT |
922 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
923 | loff_t offset, struct kvec *vec, int vlen, | |
924 | unsigned long cnt, int *stablep) | |
925 | { | |
926 | struct svc_export *exp; | |
927 | struct dentry *dentry; | |
928 | struct inode *inode; | |
929 | mm_segment_t oldfs; | |
6264d69d AV |
930 | __be32 err = 0; |
931 | int host_err; | |
1da177e4 LT |
932 | int stable = *stablep; |
933 | ||
45bd3b3d | 934 | #ifdef MSNFS |
1da177e4 LT |
935 | err = nfserr_perm; |
936 | ||
1da177e4 | 937 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
7eaa36e2 | 938 | (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt))) |
1da177e4 LT |
939 | goto out; |
940 | #endif | |
941 | ||
7eaa36e2 | 942 | dentry = file->f_path.dentry; |
1da177e4 LT |
943 | inode = dentry->d_inode; |
944 | exp = fhp->fh_export; | |
945 | ||
946 | /* | |
947 | * Request sync writes if | |
948 | * - the sync export option has been set, or | |
949 | * - the client requested O_SYNC behavior (NFSv3 feature). | |
950 | * - The file system doesn't support fsync(). | |
951 | * When gathered writes have been configured for this volume, | |
952 | * flushing the data to disk is handled separately below. | |
953 | */ | |
954 | ||
955 | if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */ | |
956 | stable = 2; | |
957 | *stablep = 2; /* FILE_SYNC */ | |
958 | } | |
959 | ||
960 | if (!EX_ISSYNC(exp)) | |
961 | stable = 0; | |
962 | if (stable && !EX_WGATHER(exp)) | |
963 | file->f_flags |= O_SYNC; | |
964 | ||
965 | /* Write the data. */ | |
966 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
6264d69d | 967 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); |
1da177e4 | 968 | set_fs(oldfs); |
6264d69d | 969 | if (host_err >= 0) { |
1da177e4 | 970 | nfsdstats.io_write += cnt; |
7eaa36e2 | 971 | fsnotify_modify(file->f_path.dentry); |
1da177e4 LT |
972 | } |
973 | ||
974 | /* clear setuid/setgid flag after write */ | |
6264d69d | 975 | if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) |
9f708e40 | 976 | kill_suid(dentry); |
1da177e4 | 977 | |
6264d69d | 978 | if (host_err >= 0 && stable) { |
1da177e4 LT |
979 | static ino_t last_ino; |
980 | static dev_t last_dev; | |
981 | ||
982 | /* | |
983 | * Gathered writes: If another process is currently | |
984 | * writing to the file, there's a high chance | |
985 | * this is another nfsd (triggered by a bulk write | |
986 | * from a client's biod). Rather than syncing the | |
987 | * file with each write request, we sleep for 10 msec. | |
988 | * | |
989 | * I don't know if this roughly approximates | |
990 | * C. Juszak's idea of gathered writes, but it's a | |
991 | * nice and simple solution (IMHO), and it seems to | |
992 | * work:-) | |
993 | */ | |
994 | if (EX_WGATHER(exp)) { | |
995 | if (atomic_read(&inode->i_writecount) > 1 | |
996 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
997 | dprintk("nfsd: write defer %d\n", current->pid); | |
998 | msleep(10); | |
999 | dprintk("nfsd: write resume %d\n", current->pid); | |
1000 | } | |
1001 | ||
1002 | if (inode->i_state & I_DIRTY) { | |
1003 | dprintk("nfsd: write sync %d\n", current->pid); | |
6264d69d | 1004 | host_err=nfsd_sync(file); |
1da177e4 LT |
1005 | } |
1006 | #if 0 | |
1007 | wake_up(&inode->i_wait); | |
1008 | #endif | |
1009 | } | |
1010 | last_ino = inode->i_ino; | |
1011 | last_dev = inode->i_sb->s_dev; | |
1012 | } | |
1013 | ||
6264d69d AV |
1014 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
1015 | if (host_err >= 0) | |
1da177e4 LT |
1016 | err = 0; |
1017 | else | |
6264d69d | 1018 | err = nfserrno(host_err); |
1da177e4 LT |
1019 | out: |
1020 | return err; | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * Read data from a file. count must contain the requested read count | |
1025 | * on entry. On return, *count contains the number of bytes actually read. | |
1026 | * N.B. After this call fhp needs an fh_put | |
1027 | */ | |
6264d69d | 1028 | __be32 |
1da177e4 LT |
1029 | nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1030 | loff_t offset, struct kvec *vec, int vlen, | |
1031 | unsigned long *count) | |
1032 | { | |
6264d69d | 1033 | __be32 err; |
1da177e4 LT |
1034 | |
1035 | if (file) { | |
1036 | err = nfsd_permission(fhp->fh_export, fhp->fh_dentry, | |
1037 | MAY_READ|MAY_OWNER_OVERRIDE); | |
1038 | if (err) | |
1039 | goto out; | |
1040 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
1041 | } else { | |
1042 | err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file); | |
1043 | if (err) | |
1044 | goto out; | |
1045 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
1046 | nfsd_close(file); | |
1047 | } | |
1048 | out: | |
1049 | return err; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Write data to a file. | |
1054 | * The stable flag requests synchronous writes. | |
1055 | * N.B. After this call fhp needs an fh_put | |
1056 | */ | |
6264d69d | 1057 | __be32 |
1da177e4 LT |
1058 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1059 | loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, | |
1060 | int *stablep) | |
1061 | { | |
6264d69d | 1062 | __be32 err = 0; |
1da177e4 LT |
1063 | |
1064 | if (file) { | |
1065 | err = nfsd_permission(fhp->fh_export, fhp->fh_dentry, | |
1066 | MAY_WRITE|MAY_OWNER_OVERRIDE); | |
1067 | if (err) | |
1068 | goto out; | |
1069 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, | |
1070 | stablep); | |
1071 | } else { | |
1072 | err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file); | |
1073 | if (err) | |
1074 | goto out; | |
1075 | ||
1076 | if (cnt) | |
1077 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, | |
1078 | cnt, stablep); | |
1079 | nfsd_close(file); | |
1080 | } | |
1081 | out: | |
1082 | return err; | |
1083 | } | |
1084 | ||
1085 | #ifdef CONFIG_NFSD_V3 | |
1086 | /* | |
1087 | * Commit all pending writes to stable storage. | |
1088 | * Strictly speaking, we could sync just the indicated file region here, | |
1089 | * but there's currently no way we can ask the VFS to do so. | |
1090 | * | |
1091 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1092 | * data to the client, as locking happens lower down in the filesystem. | |
1093 | */ | |
6264d69d | 1094 | __be32 |
1da177e4 LT |
1095 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1096 | loff_t offset, unsigned long count) | |
1097 | { | |
1098 | struct file *file; | |
6264d69d | 1099 | __be32 err; |
1da177e4 LT |
1100 | |
1101 | if ((u64)count > ~(u64)offset) | |
1102 | return nfserr_inval; | |
1103 | ||
1104 | if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0) | |
1105 | return err; | |
1106 | if (EX_ISSYNC(fhp->fh_export)) { | |
1107 | if (file->f_op && file->f_op->fsync) { | |
45bd3b3d | 1108 | err = nfserrno(nfsd_sync(file)); |
1da177e4 LT |
1109 | } else { |
1110 | err = nfserr_notsupp; | |
1111 | } | |
1112 | } | |
1113 | ||
1114 | nfsd_close(file); | |
1115 | return err; | |
1116 | } | |
1117 | #endif /* CONFIG_NFSD_V3 */ | |
1118 | ||
1119 | /* | |
1120 | * Create a file (regular, directory, device, fifo); UNIX sockets | |
1121 | * not yet implemented. | |
1122 | * If the response fh has been verified, the parent directory should | |
1123 | * already be locked. Note that the parent directory is left locked. | |
1124 | * | |
1125 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1126 | */ | |
6264d69d | 1127 | __be32 |
1da177e4 LT |
1128 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1129 | char *fname, int flen, struct iattr *iap, | |
1130 | int type, dev_t rdev, struct svc_fh *resfhp) | |
1131 | { | |
1132 | struct dentry *dentry, *dchild = NULL; | |
1133 | struct inode *dirp; | |
6264d69d AV |
1134 | __be32 err; |
1135 | int host_err; | |
1da177e4 LT |
1136 | |
1137 | err = nfserr_perm; | |
1138 | if (!flen) | |
1139 | goto out; | |
1140 | err = nfserr_exist; | |
1141 | if (isdotent(fname, flen)) | |
1142 | goto out; | |
1143 | ||
1144 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); | |
1145 | if (err) | |
1146 | goto out; | |
1147 | ||
1148 | dentry = fhp->fh_dentry; | |
1149 | dirp = dentry->d_inode; | |
1150 | ||
1151 | err = nfserr_notdir; | |
1152 | if(!dirp->i_op || !dirp->i_op->lookup) | |
1153 | goto out; | |
1154 | /* | |
1155 | * Check whether the response file handle has been verified yet. | |
1156 | * If it has, the parent directory should already be locked. | |
1157 | */ | |
1158 | if (!resfhp->fh_dentry) { | |
1159 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ | |
12fd3520 | 1160 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 | 1161 | dchild = lookup_one_len(fname, dentry, flen); |
6264d69d | 1162 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1163 | if (IS_ERR(dchild)) |
1164 | goto out_nfserr; | |
1165 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
1166 | if (err) | |
1167 | goto out; | |
1168 | } else { | |
1169 | /* called from nfsd_proc_create */ | |
1170 | dchild = dget(resfhp->fh_dentry); | |
1171 | if (!fhp->fh_locked) { | |
1172 | /* not actually possible */ | |
1173 | printk(KERN_ERR | |
1174 | "nfsd_create: parent %s/%s not locked!\n", | |
1175 | dentry->d_parent->d_name.name, | |
1176 | dentry->d_name.name); | |
d75f2b9f | 1177 | err = nfserr_io; |
1da177e4 LT |
1178 | goto out; |
1179 | } | |
1180 | } | |
1181 | /* | |
1182 | * Make sure the child dentry is still negative ... | |
1183 | */ | |
1184 | err = nfserr_exist; | |
1185 | if (dchild->d_inode) { | |
1186 | dprintk("nfsd_create: dentry %s/%s not negative!\n", | |
1187 | dentry->d_name.name, dchild->d_name.name); | |
1188 | goto out; | |
1189 | } | |
1190 | ||
1191 | if (!(iap->ia_valid & ATTR_MODE)) | |
1192 | iap->ia_mode = 0; | |
1193 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1194 | ||
1195 | /* | |
1196 | * Get the dir op function pointer. | |
1197 | */ | |
088406bc | 1198 | err = 0; |
1da177e4 LT |
1199 | switch (type) { |
1200 | case S_IFREG: | |
6264d69d | 1201 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
1da177e4 LT |
1202 | break; |
1203 | case S_IFDIR: | |
6264d69d | 1204 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
1da177e4 LT |
1205 | break; |
1206 | case S_IFCHR: | |
1207 | case S_IFBLK: | |
1208 | case S_IFIFO: | |
1209 | case S_IFSOCK: | |
6264d69d | 1210 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
1da177e4 LT |
1211 | break; |
1212 | default: | |
1213 | printk("nfsd: bad file type %o in nfsd_create\n", type); | |
6264d69d | 1214 | host_err = -EINVAL; |
1da177e4 | 1215 | } |
6264d69d | 1216 | if (host_err < 0) |
1da177e4 LT |
1217 | goto out_nfserr; |
1218 | ||
1219 | if (EX_ISSYNC(fhp->fh_export)) { | |
45bd3b3d | 1220 | err = nfserrno(nfsd_sync_dir(dentry)); |
1da177e4 LT |
1221 | write_inode_now(dchild->d_inode, 1); |
1222 | } | |
1223 | ||
1224 | ||
1225 | /* Set file attributes. Mode has already been set and | |
1226 | * setting uid/gid works only for root. Irix appears to | |
1227 | * send along the gid when it tries to implement setgid | |
1228 | * directories via NFS. | |
1229 | */ | |
f193fbab | 1230 | if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) { |
6264d69d | 1231 | __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); |
f193fbab YT |
1232 | if (err2) |
1233 | err = err2; | |
1234 | } | |
1da177e4 LT |
1235 | /* |
1236 | * Update the file handle to get the new inode info. | |
1237 | */ | |
1238 | if (!err) | |
1239 | err = fh_update(resfhp); | |
1240 | out: | |
1241 | if (dchild && !IS_ERR(dchild)) | |
1242 | dput(dchild); | |
1243 | return err; | |
1244 | ||
1245 | out_nfserr: | |
6264d69d | 1246 | err = nfserrno(host_err); |
1da177e4 LT |
1247 | goto out; |
1248 | } | |
1249 | ||
1250 | #ifdef CONFIG_NFSD_V3 | |
1251 | /* | |
1252 | * NFSv3 version of nfsd_create | |
1253 | */ | |
6264d69d | 1254 | __be32 |
1da177e4 LT |
1255 | nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1256 | char *fname, int flen, struct iattr *iap, | |
1257 | struct svc_fh *resfhp, int createmode, u32 *verifier, | |
81ac95c5 | 1258 | int *truncp, int *created) |
1da177e4 LT |
1259 | { |
1260 | struct dentry *dentry, *dchild = NULL; | |
1261 | struct inode *dirp; | |
6264d69d AV |
1262 | __be32 err; |
1263 | int host_err; | |
1da177e4 | 1264 | __u32 v_mtime=0, v_atime=0; |
1da177e4 LT |
1265 | |
1266 | err = nfserr_perm; | |
1267 | if (!flen) | |
1268 | goto out; | |
1269 | err = nfserr_exist; | |
1270 | if (isdotent(fname, flen)) | |
1271 | goto out; | |
1272 | if (!(iap->ia_valid & ATTR_MODE)) | |
1273 | iap->ia_mode = 0; | |
1274 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); | |
1275 | if (err) | |
1276 | goto out; | |
1277 | ||
1278 | dentry = fhp->fh_dentry; | |
1279 | dirp = dentry->d_inode; | |
1280 | ||
1281 | /* Get all the sanity checks out of the way before | |
1282 | * we lock the parent. */ | |
1283 | err = nfserr_notdir; | |
1284 | if(!dirp->i_op || !dirp->i_op->lookup) | |
1285 | goto out; | |
12fd3520 | 1286 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1287 | |
1288 | /* | |
1289 | * Compose the response file handle. | |
1290 | */ | |
1291 | dchild = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1292 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1293 | if (IS_ERR(dchild)) |
1294 | goto out_nfserr; | |
1295 | ||
1296 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
1297 | if (err) | |
1298 | goto out; | |
1299 | ||
1300 | if (createmode == NFS3_CREATE_EXCLUSIVE) { | |
c397852c PS |
1301 | /* solaris7 gets confused (bugid 4218508) if these have |
1302 | * the high bit set, so just clear the high bits. | |
1da177e4 LT |
1303 | */ |
1304 | v_mtime = verifier[0]&0x7fffffff; | |
1305 | v_atime = verifier[1]&0x7fffffff; | |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | if (dchild->d_inode) { | |
1309 | err = 0; | |
1310 | ||
1311 | switch (createmode) { | |
1312 | case NFS3_CREATE_UNCHECKED: | |
1313 | if (! S_ISREG(dchild->d_inode->i_mode)) | |
1314 | err = nfserr_exist; | |
1315 | else if (truncp) { | |
1316 | /* in nfsv4, we need to treat this case a little | |
1317 | * differently. we don't want to truncate the | |
1318 | * file now; this would be wrong if the OPEN | |
1319 | * fails for some other reason. furthermore, | |
1320 | * if the size is nonzero, we should ignore it | |
1321 | * according to spec! | |
1322 | */ | |
1323 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; | |
1324 | } | |
1325 | else { | |
1326 | iap->ia_valid &= ATTR_SIZE; | |
1327 | goto set_attr; | |
1328 | } | |
1329 | break; | |
1330 | case NFS3_CREATE_EXCLUSIVE: | |
1331 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime | |
1332 | && dchild->d_inode->i_atime.tv_sec == v_atime | |
1da177e4 LT |
1333 | && dchild->d_inode->i_size == 0 ) |
1334 | break; | |
1335 | /* fallthru */ | |
1336 | case NFS3_CREATE_GUARDED: | |
1337 | err = nfserr_exist; | |
1338 | } | |
1339 | goto out; | |
1340 | } | |
1341 | ||
6264d69d AV |
1342 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
1343 | if (host_err < 0) | |
1da177e4 | 1344 | goto out_nfserr; |
81ac95c5 BF |
1345 | if (created) |
1346 | *created = 1; | |
1da177e4 LT |
1347 | |
1348 | if (EX_ISSYNC(fhp->fh_export)) { | |
45bd3b3d | 1349 | err = nfserrno(nfsd_sync_dir(dentry)); |
1da177e4 LT |
1350 | /* setattr will sync the child (or not) */ |
1351 | } | |
1352 | ||
1da177e4 | 1353 | if (createmode == NFS3_CREATE_EXCLUSIVE) { |
c397852c | 1354 | /* Cram the verifier into atime/mtime */ |
1da177e4 | 1355 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
c397852c | 1356 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
1da177e4 LT |
1357 | /* XXX someone who knows this better please fix it for nsec */ |
1358 | iap->ia_mtime.tv_sec = v_mtime; | |
1359 | iap->ia_atime.tv_sec = v_atime; | |
1360 | iap->ia_mtime.tv_nsec = 0; | |
1361 | iap->ia_atime.tv_nsec = 0; | |
1da177e4 LT |
1362 | } |
1363 | ||
1364 | /* Set file attributes. | |
1da177e4 LT |
1365 | * Irix appears to send along the gid when it tries to |
1366 | * implement setgid directories via NFS. Clear out all that cruft. | |
1367 | */ | |
1368 | set_attr: | |
c397852c | 1369 | if ((iap->ia_valid &= ~(ATTR_UID|ATTR_GID|ATTR_MODE)) != 0) { |
6264d69d | 1370 | __be32 err2 = nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); |
f193fbab | 1371 | if (err2) |
45bd3b3d | 1372 | err = err2; |
f193fbab YT |
1373 | } |
1374 | ||
1375 | /* | |
1376 | * Update the filehandle to get the new inode info. | |
1377 | */ | |
1378 | if (!err) | |
1379 | err = fh_update(resfhp); | |
1da177e4 LT |
1380 | |
1381 | out: | |
1382 | fh_unlock(fhp); | |
1383 | if (dchild && !IS_ERR(dchild)) | |
1384 | dput(dchild); | |
1385 | return err; | |
1386 | ||
1387 | out_nfserr: | |
6264d69d | 1388 | err = nfserrno(host_err); |
1da177e4 LT |
1389 | goto out; |
1390 | } | |
1391 | #endif /* CONFIG_NFSD_V3 */ | |
1392 | ||
1393 | /* | |
1394 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1395 | * fits into the buffer. On return, it contains the true length. | |
1396 | * N.B. After this call fhp needs an fh_put | |
1397 | */ | |
6264d69d | 1398 | __be32 |
1da177e4 LT |
1399 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1400 | { | |
1401 | struct dentry *dentry; | |
1402 | struct inode *inode; | |
1403 | mm_segment_t oldfs; | |
6264d69d AV |
1404 | __be32 err; |
1405 | int host_err; | |
1da177e4 LT |
1406 | |
1407 | err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP); | |
1408 | if (err) | |
1409 | goto out; | |
1410 | ||
1411 | dentry = fhp->fh_dentry; | |
1412 | inode = dentry->d_inode; | |
1413 | ||
1414 | err = nfserr_inval; | |
1415 | if (!inode->i_op || !inode->i_op->readlink) | |
1416 | goto out; | |
1417 | ||
1418 | touch_atime(fhp->fh_export->ex_mnt, dentry); | |
1419 | /* N.B. Why does this call need a get_fs()?? | |
1420 | * Remove the set_fs and watch the fireworks:-) --okir | |
1421 | */ | |
1422 | ||
1423 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
6264d69d | 1424 | host_err = inode->i_op->readlink(dentry, buf, *lenp); |
1da177e4 LT |
1425 | set_fs(oldfs); |
1426 | ||
6264d69d | 1427 | if (host_err < 0) |
1da177e4 | 1428 | goto out_nfserr; |
6264d69d | 1429 | *lenp = host_err; |
1da177e4 LT |
1430 | err = 0; |
1431 | out: | |
1432 | return err; | |
1433 | ||
1434 | out_nfserr: | |
6264d69d | 1435 | err = nfserrno(host_err); |
1da177e4 LT |
1436 | goto out; |
1437 | } | |
1438 | ||
1439 | /* | |
1440 | * Create a symlink and look up its inode | |
1441 | * N.B. After this call _both_ fhp and resfhp need an fh_put | |
1442 | */ | |
6264d69d | 1443 | __be32 |
1da177e4 LT |
1444 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1445 | char *fname, int flen, | |
1446 | char *path, int plen, | |
1447 | struct svc_fh *resfhp, | |
1448 | struct iattr *iap) | |
1449 | { | |
1450 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1451 | __be32 err, cerr; |
1452 | int host_err; | |
1da177e4 LT |
1453 | umode_t mode; |
1454 | ||
1455 | err = nfserr_noent; | |
1456 | if (!flen || !plen) | |
1457 | goto out; | |
1458 | err = nfserr_exist; | |
1459 | if (isdotent(fname, flen)) | |
1460 | goto out; | |
1461 | ||
1462 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); | |
1463 | if (err) | |
1464 | goto out; | |
1465 | fh_lock(fhp); | |
1466 | dentry = fhp->fh_dentry; | |
1467 | dnew = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1468 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1469 | if (IS_ERR(dnew)) |
1470 | goto out_nfserr; | |
1471 | ||
1472 | mode = S_IALLUGO; | |
1473 | /* Only the MODE ATTRibute is even vaguely meaningful */ | |
1474 | if (iap && (iap->ia_valid & ATTR_MODE)) | |
1475 | mode = iap->ia_mode & S_IALLUGO; | |
1476 | ||
1477 | if (unlikely(path[plen] != 0)) { | |
1478 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); | |
1479 | if (path_alloced == NULL) | |
6264d69d | 1480 | host_err = -ENOMEM; |
1da177e4 LT |
1481 | else { |
1482 | strncpy(path_alloced, path, plen); | |
1483 | path_alloced[plen] = 0; | |
6264d69d | 1484 | host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode); |
1da177e4 LT |
1485 | kfree(path_alloced); |
1486 | } | |
1487 | } else | |
6264d69d | 1488 | host_err = vfs_symlink(dentry->d_inode, dnew, path, mode); |
1da177e4 | 1489 | |
6264d69d | 1490 | if (!host_err) { |
1da177e4 | 1491 | if (EX_ISSYNC(fhp->fh_export)) |
6264d69d AV |
1492 | host_err = nfsd_sync_dir(dentry); |
1493 | } | |
1494 | err = nfserrno(host_err); | |
1da177e4 LT |
1495 | fh_unlock(fhp); |
1496 | ||
1497 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); | |
1498 | dput(dnew); | |
1499 | if (err==0) err = cerr; | |
1500 | out: | |
1501 | return err; | |
1502 | ||
1503 | out_nfserr: | |
6264d69d | 1504 | err = nfserrno(host_err); |
1da177e4 LT |
1505 | goto out; |
1506 | } | |
1507 | ||
1508 | /* | |
1509 | * Create a hardlink | |
1510 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1511 | */ | |
6264d69d | 1512 | __be32 |
1da177e4 LT |
1513 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1514 | char *name, int len, struct svc_fh *tfhp) | |
1515 | { | |
1516 | struct dentry *ddir, *dnew, *dold; | |
1517 | struct inode *dirp, *dest; | |
6264d69d AV |
1518 | __be32 err; |
1519 | int host_err; | |
1da177e4 LT |
1520 | |
1521 | err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE); | |
1522 | if (err) | |
1523 | goto out; | |
1524 | err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP); | |
1525 | if (err) | |
1526 | goto out; | |
1527 | ||
1528 | err = nfserr_perm; | |
1529 | if (!len) | |
1530 | goto out; | |
1531 | err = nfserr_exist; | |
1532 | if (isdotent(name, len)) | |
1533 | goto out; | |
1534 | ||
12fd3520 | 1535 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
1da177e4 LT |
1536 | ddir = ffhp->fh_dentry; |
1537 | dirp = ddir->d_inode; | |
1538 | ||
1539 | dnew = lookup_one_len(name, ddir, len); | |
6264d69d | 1540 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1541 | if (IS_ERR(dnew)) |
1542 | goto out_nfserr; | |
1543 | ||
1544 | dold = tfhp->fh_dentry; | |
1545 | dest = dold->d_inode; | |
1546 | ||
6264d69d AV |
1547 | host_err = vfs_link(dold, dirp, dnew); |
1548 | if (!host_err) { | |
1da177e4 | 1549 | if (EX_ISSYNC(ffhp->fh_export)) { |
45bd3b3d | 1550 | err = nfserrno(nfsd_sync_dir(ddir)); |
1da177e4 LT |
1551 | write_inode_now(dest, 1); |
1552 | } | |
6264d69d | 1553 | err = 0; |
1da177e4 | 1554 | } else { |
6264d69d | 1555 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1556 | err = nfserr_acces; |
1557 | else | |
6264d69d | 1558 | err = nfserrno(host_err); |
1da177e4 LT |
1559 | } |
1560 | ||
1da177e4 | 1561 | dput(dnew); |
270d56e5 DR |
1562 | out_unlock: |
1563 | fh_unlock(ffhp); | |
1da177e4 LT |
1564 | out: |
1565 | return err; | |
1566 | ||
1567 | out_nfserr: | |
6264d69d | 1568 | err = nfserrno(host_err); |
270d56e5 | 1569 | goto out_unlock; |
1da177e4 LT |
1570 | } |
1571 | ||
1572 | /* | |
1573 | * Rename a file | |
1574 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1575 | */ | |
6264d69d | 1576 | __be32 |
1da177e4 LT |
1577 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1578 | struct svc_fh *tfhp, char *tname, int tlen) | |
1579 | { | |
1580 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1581 | struct inode *fdir, *tdir; | |
6264d69d AV |
1582 | __be32 err; |
1583 | int host_err; | |
1da177e4 LT |
1584 | |
1585 | err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE); | |
1586 | if (err) | |
1587 | goto out; | |
1588 | err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE); | |
1589 | if (err) | |
1590 | goto out; | |
1591 | ||
1592 | fdentry = ffhp->fh_dentry; | |
1593 | fdir = fdentry->d_inode; | |
1594 | ||
1595 | tdentry = tfhp->fh_dentry; | |
1596 | tdir = tdentry->d_inode; | |
1597 | ||
1598 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; | |
a56f3937 | 1599 | if (ffhp->fh_export != tfhp->fh_export) |
1da177e4 LT |
1600 | goto out; |
1601 | ||
1602 | err = nfserr_perm; | |
1603 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1604 | goto out; | |
1605 | ||
1606 | /* cannot use fh_lock as we need deadlock protective ordering | |
1607 | * so do it by hand */ | |
1608 | trap = lock_rename(tdentry, fdentry); | |
1609 | ffhp->fh_locked = tfhp->fh_locked = 1; | |
1610 | fill_pre_wcc(ffhp); | |
1611 | fill_pre_wcc(tfhp); | |
1612 | ||
1613 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1614 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1615 | if (IS_ERR(odentry)) |
1616 | goto out_nfserr; | |
1617 | ||
6264d69d | 1618 | host_err = -ENOENT; |
1da177e4 LT |
1619 | if (!odentry->d_inode) |
1620 | goto out_dput_old; | |
6264d69d | 1621 | host_err = -EINVAL; |
1da177e4 LT |
1622 | if (odentry == trap) |
1623 | goto out_dput_old; | |
1624 | ||
1625 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1626 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1627 | if (IS_ERR(ndentry)) |
1628 | goto out_dput_old; | |
6264d69d | 1629 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1630 | if (ndentry == trap) |
1631 | goto out_dput_new; | |
1632 | ||
1633 | #ifdef MSNFS | |
1634 | if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) && | |
1635 | ((atomic_read(&odentry->d_count) > 1) | |
1636 | || (atomic_read(&ndentry->d_count) > 1))) { | |
6264d69d | 1637 | host_err = -EPERM; |
1da177e4 LT |
1638 | } else |
1639 | #endif | |
6264d69d AV |
1640 | host_err = vfs_rename(fdir, odentry, tdir, ndentry); |
1641 | if (!host_err && EX_ISSYNC(tfhp->fh_export)) { | |
1642 | host_err = nfsd_sync_dir(tdentry); | |
1643 | if (!host_err) | |
1644 | host_err = nfsd_sync_dir(fdentry); | |
1da177e4 LT |
1645 | } |
1646 | ||
1647 | out_dput_new: | |
1648 | dput(ndentry); | |
1649 | out_dput_old: | |
1650 | dput(odentry); | |
1651 | out_nfserr: | |
6264d69d | 1652 | err = nfserrno(host_err); |
1da177e4 LT |
1653 | |
1654 | /* we cannot reply on fh_unlock on the two filehandles, | |
1655 | * as that would do the wrong thing if the two directories | |
1656 | * were the same, so again we do it by hand | |
1657 | */ | |
1658 | fill_post_wcc(ffhp); | |
1659 | fill_post_wcc(tfhp); | |
1660 | unlock_rename(tdentry, fdentry); | |
1661 | ffhp->fh_locked = tfhp->fh_locked = 0; | |
1662 | ||
1663 | out: | |
1664 | return err; | |
1665 | } | |
1666 | ||
1667 | /* | |
1668 | * Unlink a file or directory | |
1669 | * N.B. After this call fhp needs an fh_put | |
1670 | */ | |
6264d69d | 1671 | __be32 |
1da177e4 LT |
1672 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1673 | char *fname, int flen) | |
1674 | { | |
1675 | struct dentry *dentry, *rdentry; | |
1676 | struct inode *dirp; | |
6264d69d AV |
1677 | __be32 err; |
1678 | int host_err; | |
1da177e4 LT |
1679 | |
1680 | err = nfserr_acces; | |
1681 | if (!flen || isdotent(fname, flen)) | |
1682 | goto out; | |
1683 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE); | |
1684 | if (err) | |
1685 | goto out; | |
1686 | ||
12fd3520 | 1687 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1688 | dentry = fhp->fh_dentry; |
1689 | dirp = dentry->d_inode; | |
1690 | ||
1691 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1692 | host_err = PTR_ERR(rdentry); |
1da177e4 LT |
1693 | if (IS_ERR(rdentry)) |
1694 | goto out_nfserr; | |
1695 | ||
1696 | if (!rdentry->d_inode) { | |
1697 | dput(rdentry); | |
1698 | err = nfserr_noent; | |
1699 | goto out; | |
1700 | } | |
1701 | ||
1702 | if (!type) | |
1703 | type = rdentry->d_inode->i_mode & S_IFMT; | |
1704 | ||
1705 | if (type != S_IFDIR) { /* It's UNLINK */ | |
1706 | #ifdef MSNFS | |
1707 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && | |
1708 | (atomic_read(&rdentry->d_count) > 1)) { | |
6264d69d | 1709 | host_err = -EPERM; |
1da177e4 LT |
1710 | } else |
1711 | #endif | |
6264d69d | 1712 | host_err = vfs_unlink(dirp, rdentry); |
1da177e4 | 1713 | } else { /* It's RMDIR */ |
6264d69d | 1714 | host_err = vfs_rmdir(dirp, rdentry); |
1da177e4 LT |
1715 | } |
1716 | ||
1717 | dput(rdentry); | |
1718 | ||
6264d69d AV |
1719 | if (host_err) |
1720 | goto out_nfserr; | |
1721 | if (EX_ISSYNC(fhp->fh_export)) | |
1722 | host_err = nfsd_sync_dir(dentry); | |
1da177e4 LT |
1723 | |
1724 | out_nfserr: | |
6264d69d | 1725 | err = nfserrno(host_err); |
f193fbab YT |
1726 | out: |
1727 | return err; | |
1da177e4 LT |
1728 | } |
1729 | ||
1730 | /* | |
1731 | * Read entries from a directory. | |
1732 | * The NFSv3/4 verifier we ignore for now. | |
1733 | */ | |
6264d69d | 1734 | __be32 |
1da177e4 | 1735 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
a0ad13ef | 1736 | struct readdir_cd *cdp, filldir_t func) |
1da177e4 | 1737 | { |
6264d69d AV |
1738 | __be32 err; |
1739 | int host_err; | |
1da177e4 LT |
1740 | struct file *file; |
1741 | loff_t offset = *offsetp; | |
1742 | ||
1743 | err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file); | |
1744 | if (err) | |
1745 | goto out; | |
1746 | ||
1747 | offset = vfs_llseek(file, offset, 0); | |
1748 | if (offset < 0) { | |
1749 | err = nfserrno((int)offset); | |
1750 | goto out_close; | |
1751 | } | |
1752 | ||
1753 | /* | |
1754 | * Read the directory entries. This silly loop is necessary because | |
1755 | * readdir() is not guaranteed to fill up the entire buffer, but | |
1756 | * may choose to do less. | |
1757 | */ | |
1758 | ||
1759 | do { | |
1760 | cdp->err = nfserr_eof; /* will be cleared on successful read */ | |
a0ad13ef | 1761 | host_err = vfs_readdir(file, func, cdp); |
6264d69d AV |
1762 | } while (host_err >=0 && cdp->err == nfs_ok); |
1763 | if (host_err) | |
1764 | err = nfserrno(host_err); | |
1da177e4 LT |
1765 | else |
1766 | err = cdp->err; | |
1767 | *offsetp = vfs_llseek(file, 0, 1); | |
1768 | ||
1769 | if (err == nfserr_eof || err == nfserr_toosmall) | |
1770 | err = nfs_ok; /* can still be found in ->err */ | |
1771 | out_close: | |
1772 | nfsd_close(file); | |
1773 | out: | |
1774 | return err; | |
1775 | } | |
1776 | ||
1777 | /* | |
1778 | * Get file system stats | |
1779 | * N.B. After this call fhp needs an fh_put | |
1780 | */ | |
6264d69d | 1781 | __be32 |
1da177e4 LT |
1782 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) |
1783 | { | |
6264d69d | 1784 | __be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP); |
726c3342 | 1785 | if (!err && vfs_statfs(fhp->fh_dentry,stat)) |
1da177e4 LT |
1786 | err = nfserr_io; |
1787 | return err; | |
1788 | } | |
1789 | ||
1790 | /* | |
1791 | * Check for a user's access permissions to this inode. | |
1792 | */ | |
6264d69d | 1793 | __be32 |
1da177e4 LT |
1794 | nfsd_permission(struct svc_export *exp, struct dentry *dentry, int acc) |
1795 | { | |
1796 | struct inode *inode = dentry->d_inode; | |
1797 | int err; | |
1798 | ||
1799 | if (acc == MAY_NOP) | |
1800 | return 0; | |
1801 | #if 0 | |
1802 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
1803 | acc, | |
1804 | (acc & MAY_READ)? " read" : "", | |
1805 | (acc & MAY_WRITE)? " write" : "", | |
1806 | (acc & MAY_EXEC)? " exec" : "", | |
1807 | (acc & MAY_SATTR)? " sattr" : "", | |
1808 | (acc & MAY_TRUNC)? " trunc" : "", | |
1809 | (acc & MAY_LOCK)? " lock" : "", | |
1810 | (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1811 | inode->i_mode, | |
1812 | IS_IMMUTABLE(inode)? " immut" : "", | |
1813 | IS_APPEND(inode)? " append" : "", | |
1814 | IS_RDONLY(inode)? " ro" : ""); | |
1815 | dprintk(" owner %d/%d user %d/%d\n", | |
1816 | inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); | |
1817 | #endif | |
1818 | ||
1819 | /* Normally we reject any write/sattr etc access on a read-only file | |
1820 | * system. But if it is IRIX doing check on write-access for a | |
1821 | * device special file, we ignore rofs. | |
1822 | */ | |
1823 | if (!(acc & MAY_LOCAL_ACCESS)) | |
1824 | if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) { | |
1825 | if (EX_RDONLY(exp) || IS_RDONLY(inode)) | |
1826 | return nfserr_rofs; | |
1827 | if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode)) | |
1828 | return nfserr_perm; | |
1829 | } | |
1830 | if ((acc & MAY_TRUNC) && IS_APPEND(inode)) | |
1831 | return nfserr_perm; | |
1832 | ||
1833 | if (acc & MAY_LOCK) { | |
1834 | /* If we cannot rely on authentication in NLM requests, | |
1835 | * just allow locks, otherwise require read permission, or | |
1836 | * ownership | |
1837 | */ | |
1838 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
1839 | return 0; | |
1840 | else | |
1841 | acc = MAY_READ | MAY_OWNER_OVERRIDE; | |
1842 | } | |
1843 | /* | |
1844 | * The file owner always gets access permission for accesses that | |
1845 | * would normally be checked at open time. This is to make | |
1846 | * file access work even when the client has done a fchmod(fd, 0). | |
1847 | * | |
1848 | * However, `cp foo bar' should fail nevertheless when bar is | |
1849 | * readonly. A sensible way to do this might be to reject all | |
1850 | * attempts to truncate a read-only file, because a creat() call | |
1851 | * always implies file truncation. | |
1852 | * ... but this isn't really fair. A process may reasonably call | |
1853 | * ftruncate on an open file descriptor on a file with perm 000. | |
1854 | * We must trust the client to do permission checking - using "ACCESS" | |
1855 | * with NFSv3. | |
1856 | */ | |
1857 | if ((acc & MAY_OWNER_OVERRIDE) && | |
1858 | inode->i_uid == current->fsuid) | |
1859 | return 0; | |
1860 | ||
1861 | err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL); | |
1862 | ||
1863 | /* Allow read access to binaries even when mode 111 */ | |
1864 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
1865 | acc == (MAY_READ | MAY_OWNER_OVERRIDE)) | |
1866 | err = permission(inode, MAY_EXEC, NULL); | |
1867 | ||
1868 | return err? nfserrno(err) : 0; | |
1869 | } | |
1870 | ||
1871 | void | |
1872 | nfsd_racache_shutdown(void) | |
1873 | { | |
fce1456a | 1874 | if (!raparml) |
1da177e4 LT |
1875 | return; |
1876 | dprintk("nfsd: freeing readahead buffers.\n"); | |
1877 | kfree(raparml); | |
fce1456a | 1878 | raparml = NULL; |
1da177e4 LT |
1879 | } |
1880 | /* | |
1881 | * Initialize readahead param cache | |
1882 | */ | |
1883 | int | |
1884 | nfsd_racache_init(int cache_size) | |
1885 | { | |
1886 | int i; | |
fce1456a GB |
1887 | int j = 0; |
1888 | int nperbucket; | |
1da177e4 | 1889 | |
fce1456a GB |
1890 | |
1891 | if (raparml) | |
1da177e4 | 1892 | return 0; |
fce1456a GB |
1893 | if (cache_size < 2*RAPARM_HASH_SIZE) |
1894 | cache_size = 2*RAPARM_HASH_SIZE; | |
4b3bb06b YB |
1895 | raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL); |
1896 | ||
1897 | if (!raparml) { | |
1da177e4 | 1898 | printk(KERN_WARNING |
4b3bb06b | 1899 | "nfsd: Could not allocate memory read-ahead cache.\n"); |
1da177e4 LT |
1900 | return -ENOMEM; |
1901 | } | |
4b3bb06b YB |
1902 | |
1903 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); | |
1904 | for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) { | |
1905 | raparm_hash[i].pb_head = NULL; | |
1906 | spin_lock_init(&raparm_hash[i].pb_lock); | |
1907 | } | |
1908 | nperbucket = cache_size >> RAPARM_HASH_BITS; | |
1909 | for (i = 0; i < cache_size - 1; i++) { | |
1910 | if (i % nperbucket == 0) | |
1911 | raparm_hash[j++].pb_head = raparml + i; | |
1912 | if (i % nperbucket < nperbucket-1) | |
1913 | raparml[i].p_next = raparml + i + 1; | |
1914 | } | |
1915 | ||
1da177e4 LT |
1916 | nfsdstats.ra_size = cache_size; |
1917 | return 0; | |
1918 | } | |
a257cdd0 AG |
1919 | |
1920 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
1921 | struct posix_acl * | |
1922 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) | |
1923 | { | |
1924 | struct inode *inode = fhp->fh_dentry->d_inode; | |
1925 | char *name; | |
1926 | void *value = NULL; | |
1927 | ssize_t size; | |
1928 | struct posix_acl *acl; | |
1929 | ||
5be196e5 CH |
1930 | if (!IS_POSIXACL(inode)) |
1931 | return ERR_PTR(-EOPNOTSUPP); | |
1932 | ||
1933 | switch (type) { | |
1934 | case ACL_TYPE_ACCESS: | |
1935 | name = POSIX_ACL_XATTR_ACCESS; | |
1936 | break; | |
1937 | case ACL_TYPE_DEFAULT: | |
1938 | name = POSIX_ACL_XATTR_DEFAULT; | |
1939 | break; | |
1940 | default: | |
a257cdd0 | 1941 | return ERR_PTR(-EOPNOTSUPP); |
a257cdd0 AG |
1942 | } |
1943 | ||
5be196e5 CH |
1944 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
1945 | if (size < 0) | |
1946 | return ERR_PTR(size); | |
a257cdd0 | 1947 | |
a257cdd0 | 1948 | acl = posix_acl_from_xattr(value, size); |
a257cdd0 AG |
1949 | kfree(value); |
1950 | return acl; | |
1951 | } | |
1952 | ||
1953 | int | |
1954 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) | |
1955 | { | |
1956 | struct inode *inode = fhp->fh_dentry->d_inode; | |
1957 | char *name; | |
1958 | void *value = NULL; | |
1959 | size_t size; | |
1960 | int error; | |
1961 | ||
1962 | if (!IS_POSIXACL(inode) || !inode->i_op || | |
1963 | !inode->i_op->setxattr || !inode->i_op->removexattr) | |
1964 | return -EOPNOTSUPP; | |
1965 | switch(type) { | |
1966 | case ACL_TYPE_ACCESS: | |
334a13ec | 1967 | name = POSIX_ACL_XATTR_ACCESS; |
a257cdd0 AG |
1968 | break; |
1969 | case ACL_TYPE_DEFAULT: | |
334a13ec | 1970 | name = POSIX_ACL_XATTR_DEFAULT; |
a257cdd0 AG |
1971 | break; |
1972 | default: | |
1973 | return -EOPNOTSUPP; | |
1974 | } | |
1975 | ||
1976 | if (acl && acl->a_count) { | |
334a13ec | 1977 | size = posix_acl_xattr_size(acl->a_count); |
a257cdd0 AG |
1978 | value = kmalloc(size, GFP_KERNEL); |
1979 | if (!value) | |
1980 | return -ENOMEM; | |
9ccfc29c FM |
1981 | error = posix_acl_to_xattr(acl, value, size); |
1982 | if (error < 0) | |
a257cdd0 | 1983 | goto getout; |
9ccfc29c | 1984 | size = error; |
a257cdd0 AG |
1985 | } else |
1986 | size = 0; | |
1987 | ||
a257cdd0 | 1988 | if (size) |
5be196e5 | 1989 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
a257cdd0 AG |
1990 | else { |
1991 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) | |
1992 | error = 0; | |
1993 | else { | |
5be196e5 | 1994 | error = vfs_removexattr(fhp->fh_dentry, name); |
a257cdd0 AG |
1995 | if (error == -ENODATA) |
1996 | error = 0; | |
1997 | } | |
1998 | } | |
1999 | ||
2000 | getout: | |
2001 | kfree(value); | |
2002 | return error; | |
2003 | } | |
2004 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |