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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; | |
104 | struct vfsmount *mnt = mntget(exp->ex_mnt); | |
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); | |
159 | else if (dparent != exp->ex_dentry) { | |
160 | dentry = dget_parent(dparent); | |
161 | } else if (!EX_NOHIDE(exp)) | |
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; | |
167 | struct vfsmount *mnt = mntget(exp->ex_mnt); | |
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 | } | |
724 | *filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_mnt), flags); | |
725 | if (IS_ERR(*filp)) | |
6264d69d | 726 | host_err = PTR_ERR(*filp); |
1da177e4 | 727 | out_nfserr: |
6264d69d | 728 | err = nfserrno(host_err); |
1da177e4 LT |
729 | out: |
730 | return err; | |
731 | } | |
732 | ||
733 | /* | |
734 | * Close a file. | |
735 | */ | |
736 | void | |
737 | nfsd_close(struct file *filp) | |
738 | { | |
739 | fput(filp); | |
740 | } | |
741 | ||
742 | /* | |
743 | * Sync a file | |
744 | * As this calls fsync (not fdatasync) there is no need for a write_inode | |
745 | * after it. | |
746 | */ | |
a334de28 | 747 | static inline int nfsd_dosync(struct file *filp, struct dentry *dp, |
99ac48f5 | 748 | const struct file_operations *fop) |
1da177e4 LT |
749 | { |
750 | struct inode *inode = dp->d_inode; | |
751 | int (*fsync) (struct file *, struct dentry *, int); | |
f193fbab | 752 | int err; |
1da177e4 | 753 | |
f193fbab YT |
754 | err = filemap_fdatawrite(inode->i_mapping); |
755 | if (err == 0 && fop && (fsync = fop->fsync)) | |
756 | err = fsync(filp, dp, 0); | |
757 | if (err == 0) | |
758 | err = filemap_fdatawait(inode->i_mapping); | |
a334de28 | 759 | |
f193fbab | 760 | return err; |
1da177e4 LT |
761 | } |
762 | ||
763 | ||
a334de28 | 764 | static int |
1da177e4 LT |
765 | nfsd_sync(struct file *filp) |
766 | { | |
a334de28 | 767 | int err; |
7eaa36e2 JJS |
768 | struct inode *inode = filp->f_path.dentry->d_inode; |
769 | dprintk("nfsd: sync file %s\n", filp->f_path.dentry->d_name.name); | |
1b1dcc1b | 770 | mutex_lock(&inode->i_mutex); |
7eaa36e2 | 771 | err=nfsd_dosync(filp, filp->f_path.dentry, filp->f_op); |
1b1dcc1b | 772 | mutex_unlock(&inode->i_mutex); |
a334de28 DS |
773 | |
774 | return err; | |
1da177e4 LT |
775 | } |
776 | ||
f193fbab | 777 | int |
1da177e4 LT |
778 | nfsd_sync_dir(struct dentry *dp) |
779 | { | |
f193fbab | 780 | return nfsd_dosync(NULL, dp, dp->d_inode->i_fop); |
1da177e4 LT |
781 | } |
782 | ||
783 | /* | |
784 | * Obtain the readahead parameters for the file | |
785 | * specified by (dev, ino). | |
786 | */ | |
1da177e4 LT |
787 | |
788 | static inline struct raparms * | |
789 | nfsd_get_raparms(dev_t dev, ino_t ino) | |
790 | { | |
791 | struct raparms *ra, **rap, **frap = NULL; | |
792 | int depth = 0; | |
fce1456a GB |
793 | unsigned int hash; |
794 | struct raparm_hbucket *rab; | |
795 | ||
796 | hash = jhash_2words(dev, ino, 0xfeedbeef) & RAPARM_HASH_MASK; | |
797 | rab = &raparm_hash[hash]; | |
1da177e4 | 798 | |
fce1456a GB |
799 | spin_lock(&rab->pb_lock); |
800 | for (rap = &rab->pb_head; (ra = *rap); rap = &ra->p_next) { | |
1da177e4 LT |
801 | if (ra->p_ino == ino && ra->p_dev == dev) |
802 | goto found; | |
803 | depth++; | |
804 | if (ra->p_count == 0) | |
805 | frap = rap; | |
806 | } | |
807 | depth = nfsdstats.ra_size*11/10; | |
808 | if (!frap) { | |
fce1456a | 809 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
810 | return NULL; |
811 | } | |
812 | rap = frap; | |
813 | ra = *frap; | |
814 | ra->p_dev = dev; | |
815 | ra->p_ino = ino; | |
816 | ra->p_set = 0; | |
fce1456a | 817 | ra->p_hindex = hash; |
1da177e4 | 818 | found: |
fce1456a | 819 | if (rap != &rab->pb_head) { |
1da177e4 | 820 | *rap = ra->p_next; |
fce1456a GB |
821 | ra->p_next = rab->pb_head; |
822 | rab->pb_head = ra; | |
1da177e4 LT |
823 | } |
824 | ra->p_count++; | |
825 | nfsdstats.ra_depth[depth*10/nfsdstats.ra_size]++; | |
fce1456a | 826 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
827 | return ra; |
828 | } | |
829 | ||
830 | /* | |
cf8208d0 JA |
831 | * Grab and keep cached pages associated with a file in the svc_rqst |
832 | * so that they can be passed to the network sendmsg/sendpage routines | |
833 | * directly. They will be released after the sending has completed. | |
1da177e4 LT |
834 | */ |
835 | static int | |
cf8208d0 JA |
836 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
837 | struct splice_desc *sd) | |
1da177e4 | 838 | { |
cf8208d0 | 839 | struct svc_rqst *rqstp = sd->u.data; |
44524359 | 840 | struct page **pp = rqstp->rq_respages + rqstp->rq_resused; |
cf8208d0 JA |
841 | struct page *page = buf->page; |
842 | size_t size; | |
843 | int ret; | |
1da177e4 | 844 | |
cac36bb0 | 845 | ret = buf->ops->confirm(pipe, buf); |
cf8208d0 JA |
846 | if (unlikely(ret)) |
847 | return ret; | |
848 | ||
849 | size = sd->len; | |
1da177e4 LT |
850 | |
851 | if (rqstp->rq_res.page_len == 0) { | |
852 | get_page(page); | |
44524359 N |
853 | put_page(*pp); |
854 | *pp = page; | |
855 | rqstp->rq_resused++; | |
cf8208d0 | 856 | rqstp->rq_res.page_base = buf->offset; |
1da177e4 | 857 | rqstp->rq_res.page_len = size; |
44524359 | 858 | } else if (page != pp[-1]) { |
1da177e4 | 859 | get_page(page); |
250f3915 N |
860 | if (*pp) |
861 | put_page(*pp); | |
44524359 N |
862 | *pp = page; |
863 | rqstp->rq_resused++; | |
1da177e4 | 864 | rqstp->rq_res.page_len += size; |
44524359 | 865 | } else |
1da177e4 | 866 | rqstp->rq_res.page_len += size; |
1da177e4 | 867 | |
1da177e4 LT |
868 | return size; |
869 | } | |
870 | ||
cf8208d0 JA |
871 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
872 | struct splice_desc *sd) | |
873 | { | |
874 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
875 | } | |
876 | ||
a8754bee DH |
877 | static inline int svc_msnfs(struct svc_fh *ffhp) |
878 | { | |
879 | #ifdef MSNFS | |
880 | return (ffhp->fh_export->ex_flags & NFSEXP_MSNFS); | |
881 | #else | |
882 | return 0; | |
883 | #endif | |
884 | } | |
885 | ||
6264d69d | 886 | static __be32 |
1da177e4 LT |
887 | nfsd_vfs_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
888 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count) | |
889 | { | |
890 | struct inode *inode; | |
891 | struct raparms *ra; | |
892 | mm_segment_t oldfs; | |
6264d69d AV |
893 | __be32 err; |
894 | int host_err; | |
1da177e4 LT |
895 | |
896 | err = nfserr_perm; | |
7eaa36e2 | 897 | inode = file->f_path.dentry->d_inode; |
a8754bee DH |
898 | |
899 | if (svc_msnfs(fhp) && !lock_may_read(inode, offset, *count)) | |
1da177e4 | 900 | goto out; |
1da177e4 LT |
901 | |
902 | /* Get readahead parameters */ | |
903 | ra = nfsd_get_raparms(inode->i_sb->s_dev, inode->i_ino); | |
904 | ||
905 | if (ra && ra->p_set) | |
906 | file->f_ra = ra->p_ra; | |
907 | ||
cf8208d0 JA |
908 | if (file->f_op->splice_read && rqstp->rq_splice_ok) { |
909 | struct splice_desc sd = { | |
910 | .len = 0, | |
911 | .total_len = *count, | |
912 | .pos = offset, | |
913 | .u.data = rqstp, | |
914 | }; | |
915 | ||
4fbef206 | 916 | rqstp->rq_resused = 1; |
cf8208d0 | 917 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
1da177e4 LT |
918 | } else { |
919 | oldfs = get_fs(); | |
920 | set_fs(KERNEL_DS); | |
6264d69d | 921 | host_err = vfs_readv(file, (struct iovec __user *)vec, vlen, &offset); |
1da177e4 LT |
922 | set_fs(oldfs); |
923 | } | |
924 | ||
925 | /* Write back readahead params */ | |
926 | if (ra) { | |
fce1456a GB |
927 | struct raparm_hbucket *rab = &raparm_hash[ra->p_hindex]; |
928 | spin_lock(&rab->pb_lock); | |
1da177e4 LT |
929 | ra->p_ra = file->f_ra; |
930 | ra->p_set = 1; | |
931 | ra->p_count--; | |
fce1456a | 932 | spin_unlock(&rab->pb_lock); |
1da177e4 LT |
933 | } |
934 | ||
6264d69d AV |
935 | if (host_err >= 0) { |
936 | nfsdstats.io_read += host_err; | |
937 | *count = host_err; | |
1da177e4 | 938 | err = 0; |
7eaa36e2 | 939 | fsnotify_access(file->f_path.dentry); |
1da177e4 | 940 | } else |
6264d69d | 941 | err = nfserrno(host_err); |
1da177e4 LT |
942 | out: |
943 | return err; | |
944 | } | |
945 | ||
9f708e40 NB |
946 | static void kill_suid(struct dentry *dentry) |
947 | { | |
948 | struct iattr ia; | |
b5376771 | 949 | ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV; |
9f708e40 | 950 | |
1b1dcc1b | 951 | mutex_lock(&dentry->d_inode->i_mutex); |
9f708e40 | 952 | notify_change(dentry, &ia); |
1b1dcc1b | 953 | mutex_unlock(&dentry->d_inode->i_mutex); |
9f708e40 NB |
954 | } |
955 | ||
6264d69d | 956 | static __be32 |
1da177e4 LT |
957 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
958 | loff_t offset, struct kvec *vec, int vlen, | |
959 | unsigned long cnt, int *stablep) | |
960 | { | |
961 | struct svc_export *exp; | |
962 | struct dentry *dentry; | |
963 | struct inode *inode; | |
964 | mm_segment_t oldfs; | |
6264d69d AV |
965 | __be32 err = 0; |
966 | int host_err; | |
1da177e4 LT |
967 | int stable = *stablep; |
968 | ||
45bd3b3d | 969 | #ifdef MSNFS |
1da177e4 LT |
970 | err = nfserr_perm; |
971 | ||
1da177e4 | 972 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && |
7eaa36e2 | 973 | (!lock_may_write(file->f_path.dentry->d_inode, offset, cnt))) |
1da177e4 LT |
974 | goto out; |
975 | #endif | |
976 | ||
7eaa36e2 | 977 | dentry = file->f_path.dentry; |
1da177e4 LT |
978 | inode = dentry->d_inode; |
979 | exp = fhp->fh_export; | |
980 | ||
981 | /* | |
982 | * Request sync writes if | |
983 | * - the sync export option has been set, or | |
984 | * - the client requested O_SYNC behavior (NFSv3 feature). | |
985 | * - The file system doesn't support fsync(). | |
986 | * When gathered writes have been configured for this volume, | |
987 | * flushing the data to disk is handled separately below. | |
988 | */ | |
989 | ||
990 | if (file->f_op->fsync == 0) {/* COMMIT3 cannot work */ | |
991 | stable = 2; | |
992 | *stablep = 2; /* FILE_SYNC */ | |
993 | } | |
994 | ||
995 | if (!EX_ISSYNC(exp)) | |
996 | stable = 0; | |
997 | if (stable && !EX_WGATHER(exp)) | |
998 | file->f_flags |= O_SYNC; | |
999 | ||
1000 | /* Write the data. */ | |
1001 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
6264d69d | 1002 | host_err = vfs_writev(file, (struct iovec __user *)vec, vlen, &offset); |
1da177e4 | 1003 | set_fs(oldfs); |
6264d69d | 1004 | if (host_err >= 0) { |
1da177e4 | 1005 | nfsdstats.io_write += cnt; |
7eaa36e2 | 1006 | fsnotify_modify(file->f_path.dentry); |
1da177e4 LT |
1007 | } |
1008 | ||
1009 | /* clear setuid/setgid flag after write */ | |
6264d69d | 1010 | if (host_err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) |
9f708e40 | 1011 | kill_suid(dentry); |
1da177e4 | 1012 | |
6264d69d | 1013 | if (host_err >= 0 && stable) { |
1da177e4 LT |
1014 | static ino_t last_ino; |
1015 | static dev_t last_dev; | |
1016 | ||
1017 | /* | |
1018 | * Gathered writes: If another process is currently | |
1019 | * writing to the file, there's a high chance | |
1020 | * this is another nfsd (triggered by a bulk write | |
1021 | * from a client's biod). Rather than syncing the | |
1022 | * file with each write request, we sleep for 10 msec. | |
1023 | * | |
1024 | * I don't know if this roughly approximates | |
1025 | * C. Juszak's idea of gathered writes, but it's a | |
1026 | * nice and simple solution (IMHO), and it seems to | |
1027 | * work:-) | |
1028 | */ | |
1029 | if (EX_WGATHER(exp)) { | |
1030 | if (atomic_read(&inode->i_writecount) > 1 | |
1031 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
ba25f9dc | 1032 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); |
1da177e4 | 1033 | msleep(10); |
ba25f9dc | 1034 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); |
1da177e4 LT |
1035 | } |
1036 | ||
1037 | if (inode->i_state & I_DIRTY) { | |
ba25f9dc | 1038 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); |
6264d69d | 1039 | host_err=nfsd_sync(file); |
1da177e4 LT |
1040 | } |
1041 | #if 0 | |
1042 | wake_up(&inode->i_wait); | |
1043 | #endif | |
1044 | } | |
1045 | last_ino = inode->i_ino; | |
1046 | last_dev = inode->i_sb->s_dev; | |
1047 | } | |
1048 | ||
6264d69d AV |
1049 | dprintk("nfsd: write complete host_err=%d\n", host_err); |
1050 | if (host_err >= 0) | |
1da177e4 LT |
1051 | err = 0; |
1052 | else | |
6264d69d | 1053 | err = nfserrno(host_err); |
1da177e4 LT |
1054 | out: |
1055 | return err; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Read data from a file. count must contain the requested read count | |
1060 | * on entry. On return, *count contains the number of bytes actually read. | |
1061 | * N.B. After this call fhp needs an fh_put | |
1062 | */ | |
6264d69d | 1063 | __be32 |
1da177e4 LT |
1064 | nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1065 | loff_t offset, struct kvec *vec, int vlen, | |
1066 | unsigned long *count) | |
1067 | { | |
6264d69d | 1068 | __be32 err; |
1da177e4 LT |
1069 | |
1070 | if (file) { | |
0ec757df | 1071 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
1da177e4 LT |
1072 | MAY_READ|MAY_OWNER_OVERRIDE); |
1073 | if (err) | |
1074 | goto out; | |
1075 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
1076 | } else { | |
1077 | err = nfsd_open(rqstp, fhp, S_IFREG, MAY_READ, &file); | |
1078 | if (err) | |
1079 | goto out; | |
1080 | err = nfsd_vfs_read(rqstp, fhp, file, offset, vec, vlen, count); | |
1081 | nfsd_close(file); | |
1082 | } | |
1083 | out: | |
1084 | return err; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * Write data to a file. | |
1089 | * The stable flag requests synchronous writes. | |
1090 | * N.B. After this call fhp needs an fh_put | |
1091 | */ | |
6264d69d | 1092 | __be32 |
1da177e4 LT |
1093 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file, |
1094 | loff_t offset, struct kvec *vec, int vlen, unsigned long cnt, | |
1095 | int *stablep) | |
1096 | { | |
6264d69d | 1097 | __be32 err = 0; |
1da177e4 LT |
1098 | |
1099 | if (file) { | |
0ec757df | 1100 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, |
1da177e4 LT |
1101 | MAY_WRITE|MAY_OWNER_OVERRIDE); |
1102 | if (err) | |
1103 | goto out; | |
1104 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt, | |
1105 | stablep); | |
1106 | } else { | |
1107 | err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file); | |
1108 | if (err) | |
1109 | goto out; | |
1110 | ||
1111 | if (cnt) | |
1112 | err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, | |
1113 | cnt, stablep); | |
1114 | nfsd_close(file); | |
1115 | } | |
1116 | out: | |
1117 | return err; | |
1118 | } | |
1119 | ||
1120 | #ifdef CONFIG_NFSD_V3 | |
1121 | /* | |
1122 | * Commit all pending writes to stable storage. | |
1123 | * Strictly speaking, we could sync just the indicated file region here, | |
1124 | * but there's currently no way we can ask the VFS to do so. | |
1125 | * | |
1126 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1127 | * data to the client, as locking happens lower down in the filesystem. | |
1128 | */ | |
6264d69d | 1129 | __be32 |
1da177e4 LT |
1130 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1131 | loff_t offset, unsigned long count) | |
1132 | { | |
1133 | struct file *file; | |
6264d69d | 1134 | __be32 err; |
1da177e4 LT |
1135 | |
1136 | if ((u64)count > ~(u64)offset) | |
1137 | return nfserr_inval; | |
1138 | ||
1139 | if ((err = nfsd_open(rqstp, fhp, S_IFREG, MAY_WRITE, &file)) != 0) | |
1140 | return err; | |
1141 | if (EX_ISSYNC(fhp->fh_export)) { | |
1142 | if (file->f_op && file->f_op->fsync) { | |
45bd3b3d | 1143 | err = nfserrno(nfsd_sync(file)); |
1da177e4 LT |
1144 | } else { |
1145 | err = nfserr_notsupp; | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | nfsd_close(file); | |
1150 | return err; | |
1151 | } | |
1152 | #endif /* CONFIG_NFSD_V3 */ | |
1153 | ||
5c002b3b BF |
1154 | __be32 |
1155 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *resfhp, | |
1156 | struct iattr *iap) | |
1157 | { | |
1158 | /* | |
1159 | * Mode has already been set earlier in create: | |
1160 | */ | |
1161 | iap->ia_valid &= ~ATTR_MODE; | |
1162 | /* | |
1163 | * Setting uid/gid works only for root. Irix appears to | |
1164 | * send along the gid on create when it tries to implement | |
1165 | * setgid directories via NFS: | |
1166 | */ | |
1167 | if (current->fsuid != 0) | |
1168 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); | |
1169 | if (iap->ia_valid) | |
1170 | return nfsd_setattr(rqstp, resfhp, iap, 0, (time_t)0); | |
1171 | return 0; | |
1172 | } | |
1173 | ||
1da177e4 LT |
1174 | /* |
1175 | * Create a file (regular, directory, device, fifo); UNIX sockets | |
1176 | * not yet implemented. | |
1177 | * If the response fh has been verified, the parent directory should | |
1178 | * already be locked. Note that the parent directory is left locked. | |
1179 | * | |
1180 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1181 | */ | |
6264d69d | 1182 | __be32 |
1da177e4 LT |
1183 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1184 | char *fname, int flen, struct iattr *iap, | |
1185 | int type, dev_t rdev, struct svc_fh *resfhp) | |
1186 | { | |
1187 | struct dentry *dentry, *dchild = NULL; | |
1188 | struct inode *dirp; | |
6264d69d | 1189 | __be32 err; |
5c002b3b | 1190 | __be32 err2; |
6264d69d | 1191 | int host_err; |
1da177e4 LT |
1192 | |
1193 | err = nfserr_perm; | |
1194 | if (!flen) | |
1195 | goto out; | |
1196 | err = nfserr_exist; | |
1197 | if (isdotent(fname, flen)) | |
1198 | goto out; | |
1199 | ||
1200 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); | |
1201 | if (err) | |
1202 | goto out; | |
1203 | ||
1204 | dentry = fhp->fh_dentry; | |
1205 | dirp = dentry->d_inode; | |
1206 | ||
1207 | err = nfserr_notdir; | |
1208 | if(!dirp->i_op || !dirp->i_op->lookup) | |
1209 | goto out; | |
1210 | /* | |
1211 | * Check whether the response file handle has been verified yet. | |
1212 | * If it has, the parent directory should already be locked. | |
1213 | */ | |
1214 | if (!resfhp->fh_dentry) { | |
1215 | /* called from nfsd_proc_mkdir, or possibly nfsd3_proc_create */ | |
12fd3520 | 1216 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 | 1217 | dchild = lookup_one_len(fname, dentry, flen); |
6264d69d | 1218 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1219 | if (IS_ERR(dchild)) |
1220 | goto out_nfserr; | |
1221 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
1222 | if (err) | |
1223 | goto out; | |
1224 | } else { | |
1225 | /* called from nfsd_proc_create */ | |
1226 | dchild = dget(resfhp->fh_dentry); | |
1227 | if (!fhp->fh_locked) { | |
1228 | /* not actually possible */ | |
1229 | printk(KERN_ERR | |
1230 | "nfsd_create: parent %s/%s not locked!\n", | |
1231 | dentry->d_parent->d_name.name, | |
1232 | dentry->d_name.name); | |
d75f2b9f | 1233 | err = nfserr_io; |
1da177e4 LT |
1234 | goto out; |
1235 | } | |
1236 | } | |
1237 | /* | |
1238 | * Make sure the child dentry is still negative ... | |
1239 | */ | |
1240 | err = nfserr_exist; | |
1241 | if (dchild->d_inode) { | |
1242 | dprintk("nfsd_create: dentry %s/%s not negative!\n", | |
1243 | dentry->d_name.name, dchild->d_name.name); | |
1244 | goto out; | |
1245 | } | |
1246 | ||
1247 | if (!(iap->ia_valid & ATTR_MODE)) | |
1248 | iap->ia_mode = 0; | |
1249 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1250 | ||
1251 | /* | |
1252 | * Get the dir op function pointer. | |
1253 | */ | |
088406bc | 1254 | err = 0; |
1da177e4 LT |
1255 | switch (type) { |
1256 | case S_IFREG: | |
6264d69d | 1257 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
1da177e4 LT |
1258 | break; |
1259 | case S_IFDIR: | |
6264d69d | 1260 | host_err = vfs_mkdir(dirp, dchild, iap->ia_mode); |
1da177e4 LT |
1261 | break; |
1262 | case S_IFCHR: | |
1263 | case S_IFBLK: | |
1264 | case S_IFIFO: | |
1265 | case S_IFSOCK: | |
6264d69d | 1266 | host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev); |
1da177e4 LT |
1267 | break; |
1268 | default: | |
1269 | printk("nfsd: bad file type %o in nfsd_create\n", type); | |
6264d69d | 1270 | host_err = -EINVAL; |
1da177e4 | 1271 | } |
6264d69d | 1272 | if (host_err < 0) |
1da177e4 LT |
1273 | goto out_nfserr; |
1274 | ||
1275 | if (EX_ISSYNC(fhp->fh_export)) { | |
45bd3b3d | 1276 | err = nfserrno(nfsd_sync_dir(dentry)); |
1da177e4 LT |
1277 | write_inode_now(dchild->d_inode, 1); |
1278 | } | |
1279 | ||
1280 | ||
5c002b3b BF |
1281 | err2 = nfsd_create_setattr(rqstp, resfhp, iap); |
1282 | if (err2) | |
1283 | err = err2; | |
1da177e4 LT |
1284 | /* |
1285 | * Update the file handle to get the new inode info. | |
1286 | */ | |
1287 | if (!err) | |
1288 | err = fh_update(resfhp); | |
1289 | out: | |
1290 | if (dchild && !IS_ERR(dchild)) | |
1291 | dput(dchild); | |
1292 | return err; | |
1293 | ||
1294 | out_nfserr: | |
6264d69d | 1295 | err = nfserrno(host_err); |
1da177e4 LT |
1296 | goto out; |
1297 | } | |
1298 | ||
1299 | #ifdef CONFIG_NFSD_V3 | |
1300 | /* | |
1301 | * NFSv3 version of nfsd_create | |
1302 | */ | |
6264d69d | 1303 | __be32 |
1da177e4 LT |
1304 | nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1305 | char *fname, int flen, struct iattr *iap, | |
1306 | struct svc_fh *resfhp, int createmode, u32 *verifier, | |
81ac95c5 | 1307 | int *truncp, int *created) |
1da177e4 LT |
1308 | { |
1309 | struct dentry *dentry, *dchild = NULL; | |
1310 | struct inode *dirp; | |
6264d69d | 1311 | __be32 err; |
5c002b3b | 1312 | __be32 err2; |
6264d69d | 1313 | int host_err; |
1da177e4 | 1314 | __u32 v_mtime=0, v_atime=0; |
1da177e4 LT |
1315 | |
1316 | err = nfserr_perm; | |
1317 | if (!flen) | |
1318 | goto out; | |
1319 | err = nfserr_exist; | |
1320 | if (isdotent(fname, flen)) | |
1321 | goto out; | |
1322 | if (!(iap->ia_valid & ATTR_MODE)) | |
1323 | iap->ia_mode = 0; | |
1324 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); | |
1325 | if (err) | |
1326 | goto out; | |
1327 | ||
1328 | dentry = fhp->fh_dentry; | |
1329 | dirp = dentry->d_inode; | |
1330 | ||
1331 | /* Get all the sanity checks out of the way before | |
1332 | * we lock the parent. */ | |
1333 | err = nfserr_notdir; | |
1334 | if(!dirp->i_op || !dirp->i_op->lookup) | |
1335 | goto out; | |
12fd3520 | 1336 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1337 | |
1338 | /* | |
1339 | * Compose the response file handle. | |
1340 | */ | |
1341 | dchild = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1342 | host_err = PTR_ERR(dchild); |
1da177e4 LT |
1343 | if (IS_ERR(dchild)) |
1344 | goto out_nfserr; | |
1345 | ||
1346 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); | |
1347 | if (err) | |
1348 | goto out; | |
1349 | ||
1350 | if (createmode == NFS3_CREATE_EXCLUSIVE) { | |
c397852c | 1351 | /* solaris7 gets confused (bugid 4218508) if these have |
749997e5 JL |
1352 | * the high bit set, so just clear the high bits. If this is |
1353 | * ever changed to use different attrs for storing the | |
1354 | * verifier, then do_open_lookup() will also need to be fixed | |
1355 | * accordingly. | |
1da177e4 LT |
1356 | */ |
1357 | v_mtime = verifier[0]&0x7fffffff; | |
1358 | v_atime = verifier[1]&0x7fffffff; | |
1da177e4 LT |
1359 | } |
1360 | ||
1361 | if (dchild->d_inode) { | |
1362 | err = 0; | |
1363 | ||
1364 | switch (createmode) { | |
1365 | case NFS3_CREATE_UNCHECKED: | |
1366 | if (! S_ISREG(dchild->d_inode->i_mode)) | |
1367 | err = nfserr_exist; | |
1368 | else if (truncp) { | |
1369 | /* in nfsv4, we need to treat this case a little | |
1370 | * differently. we don't want to truncate the | |
1371 | * file now; this would be wrong if the OPEN | |
1372 | * fails for some other reason. furthermore, | |
1373 | * if the size is nonzero, we should ignore it | |
1374 | * according to spec! | |
1375 | */ | |
1376 | *truncp = (iap->ia_valid & ATTR_SIZE) && !iap->ia_size; | |
1377 | } | |
1378 | else { | |
1379 | iap->ia_valid &= ATTR_SIZE; | |
1380 | goto set_attr; | |
1381 | } | |
1382 | break; | |
1383 | case NFS3_CREATE_EXCLUSIVE: | |
1384 | if ( dchild->d_inode->i_mtime.tv_sec == v_mtime | |
1385 | && dchild->d_inode->i_atime.tv_sec == v_atime | |
1da177e4 LT |
1386 | && dchild->d_inode->i_size == 0 ) |
1387 | break; | |
1388 | /* fallthru */ | |
1389 | case NFS3_CREATE_GUARDED: | |
1390 | err = nfserr_exist; | |
1391 | } | |
1392 | goto out; | |
1393 | } | |
1394 | ||
6264d69d AV |
1395 | host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL); |
1396 | if (host_err < 0) | |
1da177e4 | 1397 | goto out_nfserr; |
81ac95c5 BF |
1398 | if (created) |
1399 | *created = 1; | |
1da177e4 LT |
1400 | |
1401 | if (EX_ISSYNC(fhp->fh_export)) { | |
45bd3b3d | 1402 | err = nfserrno(nfsd_sync_dir(dentry)); |
1da177e4 LT |
1403 | /* setattr will sync the child (or not) */ |
1404 | } | |
1405 | ||
1da177e4 | 1406 | if (createmode == NFS3_CREATE_EXCLUSIVE) { |
c397852c | 1407 | /* Cram the verifier into atime/mtime */ |
1da177e4 | 1408 | iap->ia_valid = ATTR_MTIME|ATTR_ATIME |
c397852c | 1409 | | ATTR_MTIME_SET|ATTR_ATIME_SET; |
1da177e4 LT |
1410 | /* XXX someone who knows this better please fix it for nsec */ |
1411 | iap->ia_mtime.tv_sec = v_mtime; | |
1412 | iap->ia_atime.tv_sec = v_atime; | |
1413 | iap->ia_mtime.tv_nsec = 0; | |
1414 | iap->ia_atime.tv_nsec = 0; | |
1da177e4 LT |
1415 | } |
1416 | ||
1da177e4 | 1417 | set_attr: |
5c002b3b BF |
1418 | err2 = nfsd_create_setattr(rqstp, resfhp, iap); |
1419 | if (err2) | |
1420 | err = err2; | |
f193fbab YT |
1421 | |
1422 | /* | |
1423 | * Update the filehandle to get the new inode info. | |
1424 | */ | |
1425 | if (!err) | |
1426 | err = fh_update(resfhp); | |
1da177e4 LT |
1427 | |
1428 | out: | |
1429 | fh_unlock(fhp); | |
1430 | if (dchild && !IS_ERR(dchild)) | |
1431 | dput(dchild); | |
1432 | return err; | |
1433 | ||
1434 | out_nfserr: | |
6264d69d | 1435 | err = nfserrno(host_err); |
1da177e4 LT |
1436 | goto out; |
1437 | } | |
1438 | #endif /* CONFIG_NFSD_V3 */ | |
1439 | ||
1440 | /* | |
1441 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1442 | * fits into the buffer. On return, it contains the true length. | |
1443 | * N.B. After this call fhp needs an fh_put | |
1444 | */ | |
6264d69d | 1445 | __be32 |
1da177e4 LT |
1446 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1447 | { | |
1448 | struct dentry *dentry; | |
1449 | struct inode *inode; | |
1450 | mm_segment_t oldfs; | |
6264d69d AV |
1451 | __be32 err; |
1452 | int host_err; | |
1da177e4 LT |
1453 | |
1454 | err = fh_verify(rqstp, fhp, S_IFLNK, MAY_NOP); | |
1455 | if (err) | |
1456 | goto out; | |
1457 | ||
1458 | dentry = fhp->fh_dentry; | |
1459 | inode = dentry->d_inode; | |
1460 | ||
1461 | err = nfserr_inval; | |
1462 | if (!inode->i_op || !inode->i_op->readlink) | |
1463 | goto out; | |
1464 | ||
1465 | touch_atime(fhp->fh_export->ex_mnt, dentry); | |
1466 | /* N.B. Why does this call need a get_fs()?? | |
1467 | * Remove the set_fs and watch the fireworks:-) --okir | |
1468 | */ | |
1469 | ||
1470 | oldfs = get_fs(); set_fs(KERNEL_DS); | |
6264d69d | 1471 | host_err = inode->i_op->readlink(dentry, buf, *lenp); |
1da177e4 LT |
1472 | set_fs(oldfs); |
1473 | ||
6264d69d | 1474 | if (host_err < 0) |
1da177e4 | 1475 | goto out_nfserr; |
6264d69d | 1476 | *lenp = host_err; |
1da177e4 LT |
1477 | err = 0; |
1478 | out: | |
1479 | return err; | |
1480 | ||
1481 | out_nfserr: | |
6264d69d | 1482 | err = nfserrno(host_err); |
1da177e4 LT |
1483 | goto out; |
1484 | } | |
1485 | ||
1486 | /* | |
1487 | * Create a symlink and look up its inode | |
1488 | * N.B. After this call _both_ fhp and resfhp need an fh_put | |
1489 | */ | |
6264d69d | 1490 | __be32 |
1da177e4 LT |
1491 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1492 | char *fname, int flen, | |
1493 | char *path, int plen, | |
1494 | struct svc_fh *resfhp, | |
1495 | struct iattr *iap) | |
1496 | { | |
1497 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1498 | __be32 err, cerr; |
1499 | int host_err; | |
1da177e4 LT |
1500 | umode_t mode; |
1501 | ||
1502 | err = nfserr_noent; | |
1503 | if (!flen || !plen) | |
1504 | goto out; | |
1505 | err = nfserr_exist; | |
1506 | if (isdotent(fname, flen)) | |
1507 | goto out; | |
1508 | ||
1509 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE); | |
1510 | if (err) | |
1511 | goto out; | |
1512 | fh_lock(fhp); | |
1513 | dentry = fhp->fh_dentry; | |
1514 | dnew = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1515 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1516 | if (IS_ERR(dnew)) |
1517 | goto out_nfserr; | |
1518 | ||
1519 | mode = S_IALLUGO; | |
1520 | /* Only the MODE ATTRibute is even vaguely meaningful */ | |
1521 | if (iap && (iap->ia_valid & ATTR_MODE)) | |
1522 | mode = iap->ia_mode & S_IALLUGO; | |
1523 | ||
1524 | if (unlikely(path[plen] != 0)) { | |
1525 | char *path_alloced = kmalloc(plen+1, GFP_KERNEL); | |
1526 | if (path_alloced == NULL) | |
6264d69d | 1527 | host_err = -ENOMEM; |
1da177e4 LT |
1528 | else { |
1529 | strncpy(path_alloced, path, plen); | |
1530 | path_alloced[plen] = 0; | |
6264d69d | 1531 | host_err = vfs_symlink(dentry->d_inode, dnew, path_alloced, mode); |
1da177e4 LT |
1532 | kfree(path_alloced); |
1533 | } | |
1534 | } else | |
6264d69d | 1535 | host_err = vfs_symlink(dentry->d_inode, dnew, path, mode); |
1da177e4 | 1536 | |
6264d69d | 1537 | if (!host_err) { |
1da177e4 | 1538 | if (EX_ISSYNC(fhp->fh_export)) |
6264d69d AV |
1539 | host_err = nfsd_sync_dir(dentry); |
1540 | } | |
1541 | err = nfserrno(host_err); | |
1da177e4 LT |
1542 | fh_unlock(fhp); |
1543 | ||
1544 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); | |
1545 | dput(dnew); | |
1546 | if (err==0) err = cerr; | |
1547 | out: | |
1548 | return err; | |
1549 | ||
1550 | out_nfserr: | |
6264d69d | 1551 | err = nfserrno(host_err); |
1da177e4 LT |
1552 | goto out; |
1553 | } | |
1554 | ||
1555 | /* | |
1556 | * Create a hardlink | |
1557 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1558 | */ | |
6264d69d | 1559 | __be32 |
1da177e4 LT |
1560 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1561 | char *name, int len, struct svc_fh *tfhp) | |
1562 | { | |
1563 | struct dentry *ddir, *dnew, *dold; | |
1564 | struct inode *dirp, *dest; | |
6264d69d AV |
1565 | __be32 err; |
1566 | int host_err; | |
1da177e4 LT |
1567 | |
1568 | err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE); | |
1569 | if (err) | |
1570 | goto out; | |
1571 | err = fh_verify(rqstp, tfhp, -S_IFDIR, MAY_NOP); | |
1572 | if (err) | |
1573 | goto out; | |
1574 | ||
1575 | err = nfserr_perm; | |
1576 | if (!len) | |
1577 | goto out; | |
1578 | err = nfserr_exist; | |
1579 | if (isdotent(name, len)) | |
1580 | goto out; | |
1581 | ||
12fd3520 | 1582 | fh_lock_nested(ffhp, I_MUTEX_PARENT); |
1da177e4 LT |
1583 | ddir = ffhp->fh_dentry; |
1584 | dirp = ddir->d_inode; | |
1585 | ||
1586 | dnew = lookup_one_len(name, ddir, len); | |
6264d69d | 1587 | host_err = PTR_ERR(dnew); |
1da177e4 LT |
1588 | if (IS_ERR(dnew)) |
1589 | goto out_nfserr; | |
1590 | ||
1591 | dold = tfhp->fh_dentry; | |
1592 | dest = dold->d_inode; | |
1593 | ||
6264d69d AV |
1594 | host_err = vfs_link(dold, dirp, dnew); |
1595 | if (!host_err) { | |
1da177e4 | 1596 | if (EX_ISSYNC(ffhp->fh_export)) { |
45bd3b3d | 1597 | err = nfserrno(nfsd_sync_dir(ddir)); |
1da177e4 LT |
1598 | write_inode_now(dest, 1); |
1599 | } | |
6264d69d | 1600 | err = 0; |
1da177e4 | 1601 | } else { |
6264d69d | 1602 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1603 | err = nfserr_acces; |
1604 | else | |
6264d69d | 1605 | err = nfserrno(host_err); |
1da177e4 LT |
1606 | } |
1607 | ||
1da177e4 | 1608 | dput(dnew); |
270d56e5 DR |
1609 | out_unlock: |
1610 | fh_unlock(ffhp); | |
1da177e4 LT |
1611 | out: |
1612 | return err; | |
1613 | ||
1614 | out_nfserr: | |
6264d69d | 1615 | err = nfserrno(host_err); |
270d56e5 | 1616 | goto out_unlock; |
1da177e4 LT |
1617 | } |
1618 | ||
1619 | /* | |
1620 | * Rename a file | |
1621 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1622 | */ | |
6264d69d | 1623 | __be32 |
1da177e4 LT |
1624 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1625 | struct svc_fh *tfhp, char *tname, int tlen) | |
1626 | { | |
1627 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1628 | struct inode *fdir, *tdir; | |
6264d69d AV |
1629 | __be32 err; |
1630 | int host_err; | |
1da177e4 LT |
1631 | |
1632 | err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE); | |
1633 | if (err) | |
1634 | goto out; | |
1635 | err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE); | |
1636 | if (err) | |
1637 | goto out; | |
1638 | ||
1639 | fdentry = ffhp->fh_dentry; | |
1640 | fdir = fdentry->d_inode; | |
1641 | ||
1642 | tdentry = tfhp->fh_dentry; | |
1643 | tdir = tdentry->d_inode; | |
1644 | ||
1645 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; | |
a56f3937 | 1646 | if (ffhp->fh_export != tfhp->fh_export) |
1da177e4 LT |
1647 | goto out; |
1648 | ||
1649 | err = nfserr_perm; | |
1650 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1651 | goto out; | |
1652 | ||
1653 | /* cannot use fh_lock as we need deadlock protective ordering | |
1654 | * so do it by hand */ | |
1655 | trap = lock_rename(tdentry, fdentry); | |
1656 | ffhp->fh_locked = tfhp->fh_locked = 1; | |
1657 | fill_pre_wcc(ffhp); | |
1658 | fill_pre_wcc(tfhp); | |
1659 | ||
1660 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1661 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1662 | if (IS_ERR(odentry)) |
1663 | goto out_nfserr; | |
1664 | ||
6264d69d | 1665 | host_err = -ENOENT; |
1da177e4 LT |
1666 | if (!odentry->d_inode) |
1667 | goto out_dput_old; | |
6264d69d | 1668 | host_err = -EINVAL; |
1da177e4 LT |
1669 | if (odentry == trap) |
1670 | goto out_dput_old; | |
1671 | ||
1672 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1673 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1674 | if (IS_ERR(ndentry)) |
1675 | goto out_dput_old; | |
6264d69d | 1676 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1677 | if (ndentry == trap) |
1678 | goto out_dput_new; | |
1679 | ||
1680 | #ifdef MSNFS | |
1681 | if ((ffhp->fh_export->ex_flags & NFSEXP_MSNFS) && | |
1682 | ((atomic_read(&odentry->d_count) > 1) | |
1683 | || (atomic_read(&ndentry->d_count) > 1))) { | |
6264d69d | 1684 | host_err = -EPERM; |
1da177e4 LT |
1685 | } else |
1686 | #endif | |
6264d69d AV |
1687 | host_err = vfs_rename(fdir, odentry, tdir, ndentry); |
1688 | if (!host_err && EX_ISSYNC(tfhp->fh_export)) { | |
1689 | host_err = nfsd_sync_dir(tdentry); | |
1690 | if (!host_err) | |
1691 | host_err = nfsd_sync_dir(fdentry); | |
1da177e4 LT |
1692 | } |
1693 | ||
1694 | out_dput_new: | |
1695 | dput(ndentry); | |
1696 | out_dput_old: | |
1697 | dput(odentry); | |
1698 | out_nfserr: | |
6264d69d | 1699 | err = nfserrno(host_err); |
1da177e4 LT |
1700 | |
1701 | /* we cannot reply on fh_unlock on the two filehandles, | |
1702 | * as that would do the wrong thing if the two directories | |
1703 | * were the same, so again we do it by hand | |
1704 | */ | |
1705 | fill_post_wcc(ffhp); | |
1706 | fill_post_wcc(tfhp); | |
1707 | unlock_rename(tdentry, fdentry); | |
1708 | ffhp->fh_locked = tfhp->fh_locked = 0; | |
1709 | ||
1710 | out: | |
1711 | return err; | |
1712 | } | |
1713 | ||
1714 | /* | |
1715 | * Unlink a file or directory | |
1716 | * N.B. After this call fhp needs an fh_put | |
1717 | */ | |
6264d69d | 1718 | __be32 |
1da177e4 LT |
1719 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1720 | char *fname, int flen) | |
1721 | { | |
1722 | struct dentry *dentry, *rdentry; | |
1723 | struct inode *dirp; | |
6264d69d AV |
1724 | __be32 err; |
1725 | int host_err; | |
1da177e4 LT |
1726 | |
1727 | err = nfserr_acces; | |
1728 | if (!flen || isdotent(fname, flen)) | |
1729 | goto out; | |
1730 | err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE); | |
1731 | if (err) | |
1732 | goto out; | |
1733 | ||
12fd3520 | 1734 | fh_lock_nested(fhp, I_MUTEX_PARENT); |
1da177e4 LT |
1735 | dentry = fhp->fh_dentry; |
1736 | dirp = dentry->d_inode; | |
1737 | ||
1738 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1739 | host_err = PTR_ERR(rdentry); |
1da177e4 LT |
1740 | if (IS_ERR(rdentry)) |
1741 | goto out_nfserr; | |
1742 | ||
1743 | if (!rdentry->d_inode) { | |
1744 | dput(rdentry); | |
1745 | err = nfserr_noent; | |
1746 | goto out; | |
1747 | } | |
1748 | ||
1749 | if (!type) | |
1750 | type = rdentry->d_inode->i_mode & S_IFMT; | |
1751 | ||
1752 | if (type != S_IFDIR) { /* It's UNLINK */ | |
1753 | #ifdef MSNFS | |
1754 | if ((fhp->fh_export->ex_flags & NFSEXP_MSNFS) && | |
1755 | (atomic_read(&rdentry->d_count) > 1)) { | |
6264d69d | 1756 | host_err = -EPERM; |
1da177e4 LT |
1757 | } else |
1758 | #endif | |
6264d69d | 1759 | host_err = vfs_unlink(dirp, rdentry); |
1da177e4 | 1760 | } else { /* It's RMDIR */ |
6264d69d | 1761 | host_err = vfs_rmdir(dirp, rdentry); |
1da177e4 LT |
1762 | } |
1763 | ||
1764 | dput(rdentry); | |
1765 | ||
6264d69d AV |
1766 | if (host_err) |
1767 | goto out_nfserr; | |
1768 | if (EX_ISSYNC(fhp->fh_export)) | |
1769 | host_err = nfsd_sync_dir(dentry); | |
1da177e4 LT |
1770 | |
1771 | out_nfserr: | |
6264d69d | 1772 | err = nfserrno(host_err); |
f193fbab YT |
1773 | out: |
1774 | return err; | |
1da177e4 LT |
1775 | } |
1776 | ||
1777 | /* | |
1778 | * Read entries from a directory. | |
1779 | * The NFSv3/4 verifier we ignore for now. | |
1780 | */ | |
6264d69d | 1781 | __be32 |
1da177e4 | 1782 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
a0ad13ef | 1783 | struct readdir_cd *cdp, filldir_t func) |
1da177e4 | 1784 | { |
6264d69d AV |
1785 | __be32 err; |
1786 | int host_err; | |
1da177e4 LT |
1787 | struct file *file; |
1788 | loff_t offset = *offsetp; | |
1789 | ||
1790 | err = nfsd_open(rqstp, fhp, S_IFDIR, MAY_READ, &file); | |
1791 | if (err) | |
1792 | goto out; | |
1793 | ||
1794 | offset = vfs_llseek(file, offset, 0); | |
1795 | if (offset < 0) { | |
1796 | err = nfserrno((int)offset); | |
1797 | goto out_close; | |
1798 | } | |
1799 | ||
1800 | /* | |
1801 | * Read the directory entries. This silly loop is necessary because | |
1802 | * readdir() is not guaranteed to fill up the entire buffer, but | |
1803 | * may choose to do less. | |
1804 | */ | |
1805 | ||
1806 | do { | |
1807 | cdp->err = nfserr_eof; /* will be cleared on successful read */ | |
a0ad13ef | 1808 | host_err = vfs_readdir(file, func, cdp); |
6264d69d AV |
1809 | } while (host_err >=0 && cdp->err == nfs_ok); |
1810 | if (host_err) | |
1811 | err = nfserrno(host_err); | |
1da177e4 LT |
1812 | else |
1813 | err = cdp->err; | |
1814 | *offsetp = vfs_llseek(file, 0, 1); | |
1815 | ||
1816 | if (err == nfserr_eof || err == nfserr_toosmall) | |
1817 | err = nfs_ok; /* can still be found in ->err */ | |
1818 | out_close: | |
1819 | nfsd_close(file); | |
1820 | out: | |
1821 | return err; | |
1822 | } | |
1823 | ||
1824 | /* | |
1825 | * Get file system stats | |
1826 | * N.B. After this call fhp needs an fh_put | |
1827 | */ | |
6264d69d | 1828 | __be32 |
1da177e4 LT |
1829 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat) |
1830 | { | |
6264d69d | 1831 | __be32 err = fh_verify(rqstp, fhp, 0, MAY_NOP); |
726c3342 | 1832 | if (!err && vfs_statfs(fhp->fh_dentry,stat)) |
1da177e4 LT |
1833 | err = nfserr_io; |
1834 | return err; | |
1835 | } | |
1836 | ||
c7d51402 | 1837 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
e22841c6 | 1838 | { |
c7d51402 | 1839 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
e22841c6 BF |
1840 | } |
1841 | ||
1da177e4 LT |
1842 | /* |
1843 | * Check for a user's access permissions to this inode. | |
1844 | */ | |
6264d69d | 1845 | __be32 |
0ec757df BF |
1846 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
1847 | struct dentry *dentry, int acc) | |
1da177e4 LT |
1848 | { |
1849 | struct inode *inode = dentry->d_inode; | |
1850 | int err; | |
1851 | ||
1852 | if (acc == MAY_NOP) | |
1853 | return 0; | |
1854 | #if 0 | |
1855 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
1856 | acc, | |
1857 | (acc & MAY_READ)? " read" : "", | |
1858 | (acc & MAY_WRITE)? " write" : "", | |
1859 | (acc & MAY_EXEC)? " exec" : "", | |
1860 | (acc & MAY_SATTR)? " sattr" : "", | |
1861 | (acc & MAY_TRUNC)? " trunc" : "", | |
1862 | (acc & MAY_LOCK)? " lock" : "", | |
1863 | (acc & MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1864 | inode->i_mode, | |
1865 | IS_IMMUTABLE(inode)? " immut" : "", | |
1866 | IS_APPEND(inode)? " append" : "", | |
1867 | IS_RDONLY(inode)? " ro" : ""); | |
1868 | dprintk(" owner %d/%d user %d/%d\n", | |
1869 | inode->i_uid, inode->i_gid, current->fsuid, current->fsgid); | |
1870 | #endif | |
1871 | ||
1872 | /* Normally we reject any write/sattr etc access on a read-only file | |
1873 | * system. But if it is IRIX doing check on write-access for a | |
1874 | * device special file, we ignore rofs. | |
1875 | */ | |
1876 | if (!(acc & MAY_LOCAL_ACCESS)) | |
1877 | if (acc & (MAY_WRITE | MAY_SATTR | MAY_TRUNC)) { | |
c7d51402 | 1878 | if (exp_rdonly(rqstp, exp) || IS_RDONLY(inode)) |
1da177e4 LT |
1879 | return nfserr_rofs; |
1880 | if (/* (acc & MAY_WRITE) && */ IS_IMMUTABLE(inode)) | |
1881 | return nfserr_perm; | |
1882 | } | |
1883 | if ((acc & MAY_TRUNC) && IS_APPEND(inode)) | |
1884 | return nfserr_perm; | |
1885 | ||
1886 | if (acc & MAY_LOCK) { | |
1887 | /* If we cannot rely on authentication in NLM requests, | |
1888 | * just allow locks, otherwise require read permission, or | |
1889 | * ownership | |
1890 | */ | |
1891 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
1892 | return 0; | |
1893 | else | |
1894 | acc = MAY_READ | MAY_OWNER_OVERRIDE; | |
1895 | } | |
1896 | /* | |
1897 | * The file owner always gets access permission for accesses that | |
1898 | * would normally be checked at open time. This is to make | |
1899 | * file access work even when the client has done a fchmod(fd, 0). | |
1900 | * | |
1901 | * However, `cp foo bar' should fail nevertheless when bar is | |
1902 | * readonly. A sensible way to do this might be to reject all | |
1903 | * attempts to truncate a read-only file, because a creat() call | |
1904 | * always implies file truncation. | |
1905 | * ... but this isn't really fair. A process may reasonably call | |
1906 | * ftruncate on an open file descriptor on a file with perm 000. | |
1907 | * We must trust the client to do permission checking - using "ACCESS" | |
1908 | * with NFSv3. | |
1909 | */ | |
1910 | if ((acc & MAY_OWNER_OVERRIDE) && | |
1911 | inode->i_uid == current->fsuid) | |
1912 | return 0; | |
1913 | ||
1914 | err = permission(inode, acc & (MAY_READ|MAY_WRITE|MAY_EXEC), NULL); | |
1915 | ||
1916 | /* Allow read access to binaries even when mode 111 */ | |
1917 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
1918 | acc == (MAY_READ | MAY_OWNER_OVERRIDE)) | |
1919 | err = permission(inode, MAY_EXEC, NULL); | |
1920 | ||
1921 | return err? nfserrno(err) : 0; | |
1922 | } | |
1923 | ||
1924 | void | |
1925 | nfsd_racache_shutdown(void) | |
1926 | { | |
fce1456a | 1927 | if (!raparml) |
1da177e4 LT |
1928 | return; |
1929 | dprintk("nfsd: freeing readahead buffers.\n"); | |
1930 | kfree(raparml); | |
fce1456a | 1931 | raparml = NULL; |
1da177e4 LT |
1932 | } |
1933 | /* | |
1934 | * Initialize readahead param cache | |
1935 | */ | |
1936 | int | |
1937 | nfsd_racache_init(int cache_size) | |
1938 | { | |
1939 | int i; | |
fce1456a GB |
1940 | int j = 0; |
1941 | int nperbucket; | |
1da177e4 | 1942 | |
fce1456a GB |
1943 | |
1944 | if (raparml) | |
1da177e4 | 1945 | return 0; |
fce1456a GB |
1946 | if (cache_size < 2*RAPARM_HASH_SIZE) |
1947 | cache_size = 2*RAPARM_HASH_SIZE; | |
4b3bb06b YB |
1948 | raparml = kcalloc(cache_size, sizeof(struct raparms), GFP_KERNEL); |
1949 | ||
1950 | if (!raparml) { | |
1da177e4 | 1951 | printk(KERN_WARNING |
4b3bb06b | 1952 | "nfsd: Could not allocate memory read-ahead cache.\n"); |
1da177e4 LT |
1953 | return -ENOMEM; |
1954 | } | |
4b3bb06b YB |
1955 | |
1956 | dprintk("nfsd: allocating %d readahead buffers.\n", cache_size); | |
1957 | for (i = 0 ; i < RAPARM_HASH_SIZE ; i++) { | |
1958 | raparm_hash[i].pb_head = NULL; | |
1959 | spin_lock_init(&raparm_hash[i].pb_lock); | |
1960 | } | |
a280df32 | 1961 | nperbucket = DIV_ROUND_UP(cache_size, RAPARM_HASH_SIZE); |
4b3bb06b YB |
1962 | for (i = 0; i < cache_size - 1; i++) { |
1963 | if (i % nperbucket == 0) | |
1964 | raparm_hash[j++].pb_head = raparml + i; | |
1965 | if (i % nperbucket < nperbucket-1) | |
1966 | raparml[i].p_next = raparml + i + 1; | |
1967 | } | |
1968 | ||
1da177e4 LT |
1969 | nfsdstats.ra_size = cache_size; |
1970 | return 0; | |
1971 | } | |
a257cdd0 AG |
1972 | |
1973 | #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) | |
1974 | struct posix_acl * | |
1975 | nfsd_get_posix_acl(struct svc_fh *fhp, int type) | |
1976 | { | |
1977 | struct inode *inode = fhp->fh_dentry->d_inode; | |
1978 | char *name; | |
1979 | void *value = NULL; | |
1980 | ssize_t size; | |
1981 | struct posix_acl *acl; | |
1982 | ||
5be196e5 CH |
1983 | if (!IS_POSIXACL(inode)) |
1984 | return ERR_PTR(-EOPNOTSUPP); | |
1985 | ||
1986 | switch (type) { | |
1987 | case ACL_TYPE_ACCESS: | |
1988 | name = POSIX_ACL_XATTR_ACCESS; | |
1989 | break; | |
1990 | case ACL_TYPE_DEFAULT: | |
1991 | name = POSIX_ACL_XATTR_DEFAULT; | |
1992 | break; | |
1993 | default: | |
a257cdd0 | 1994 | return ERR_PTR(-EOPNOTSUPP); |
a257cdd0 AG |
1995 | } |
1996 | ||
5be196e5 CH |
1997 | size = nfsd_getxattr(fhp->fh_dentry, name, &value); |
1998 | if (size < 0) | |
1999 | return ERR_PTR(size); | |
a257cdd0 | 2000 | |
a257cdd0 | 2001 | acl = posix_acl_from_xattr(value, size); |
a257cdd0 AG |
2002 | kfree(value); |
2003 | return acl; | |
2004 | } | |
2005 | ||
2006 | int | |
2007 | nfsd_set_posix_acl(struct svc_fh *fhp, int type, struct posix_acl *acl) | |
2008 | { | |
2009 | struct inode *inode = fhp->fh_dentry->d_inode; | |
2010 | char *name; | |
2011 | void *value = NULL; | |
2012 | size_t size; | |
2013 | int error; | |
2014 | ||
2015 | if (!IS_POSIXACL(inode) || !inode->i_op || | |
2016 | !inode->i_op->setxattr || !inode->i_op->removexattr) | |
2017 | return -EOPNOTSUPP; | |
2018 | switch(type) { | |
2019 | case ACL_TYPE_ACCESS: | |
334a13ec | 2020 | name = POSIX_ACL_XATTR_ACCESS; |
a257cdd0 AG |
2021 | break; |
2022 | case ACL_TYPE_DEFAULT: | |
334a13ec | 2023 | name = POSIX_ACL_XATTR_DEFAULT; |
a257cdd0 AG |
2024 | break; |
2025 | default: | |
2026 | return -EOPNOTSUPP; | |
2027 | } | |
2028 | ||
2029 | if (acl && acl->a_count) { | |
334a13ec | 2030 | size = posix_acl_xattr_size(acl->a_count); |
a257cdd0 AG |
2031 | value = kmalloc(size, GFP_KERNEL); |
2032 | if (!value) | |
2033 | return -ENOMEM; | |
9ccfc29c FM |
2034 | error = posix_acl_to_xattr(acl, value, size); |
2035 | if (error < 0) | |
a257cdd0 | 2036 | goto getout; |
9ccfc29c | 2037 | size = error; |
a257cdd0 AG |
2038 | } else |
2039 | size = 0; | |
2040 | ||
a257cdd0 | 2041 | if (size) |
5be196e5 | 2042 | error = vfs_setxattr(fhp->fh_dentry, name, value, size, 0); |
a257cdd0 AG |
2043 | else { |
2044 | if (!S_ISDIR(inode->i_mode) && type == ACL_TYPE_DEFAULT) | |
2045 | error = 0; | |
2046 | else { | |
5be196e5 | 2047 | error = vfs_removexattr(fhp->fh_dentry, name); |
a257cdd0 AG |
2048 | if (error == -ENODATA) |
2049 | error = 0; | |
2050 | } | |
2051 | } | |
2052 | ||
2053 | getout: | |
2054 | kfree(value); | |
2055 | return error; | |
2056 | } | |
2057 | #endif /* defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL) */ |