Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * File operations used by nfsd. Some of these have been ripped from |
4 | * other parts of the kernel because they weren't exported, others | |
5 | * are partial duplicates with added or changed functionality. | |
6 | * | |
7 | * Note that several functions dget() the dentry upon which they want | |
8 | * to act, most notably those that create directory entries. Response | |
9 | * dentry's are dput()'d if necessary in the release callback. | |
10 | * So if you notice code paths that apparently fail to dput() the | |
11 | * dentry, don't worry--they have been taken care of. | |
12 | * | |
13 | * Copyright (C) 1995-1999 Olaf Kirch <okir@monad.swb.de> | |
14 | * Zerocpy NFS support (C) 2002 Hirokazu Takahashi <taka@valinux.co.jp> | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/fs.h> |
18 | #include <linux/file.h> | |
d6b29d7c | 19 | #include <linux/splice.h> |
95d871f0 | 20 | #include <linux/falloc.h> |
1da177e4 | 21 | #include <linux/fcntl.h> |
1da177e4 | 22 | #include <linux/namei.h> |
1da177e4 | 23 | #include <linux/delay.h> |
0eeca283 | 24 | #include <linux/fsnotify.h> |
1da177e4 | 25 | #include <linux/posix_acl_xattr.h> |
1da177e4 | 26 | #include <linux/xattr.h> |
9a74af21 | 27 | #include <linux/jhash.h> |
cbcc268b | 28 | #include <linux/pagemap.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
7c0f6ba6 | 30 | #include <linux/uaccess.h> |
f501912a BM |
31 | #include <linux/exportfs.h> |
32 | #include <linux/writeback.h> | |
18032ca0 | 33 | #include <linux/security.h> |
9a74af21 | 34 | |
9a74af21 | 35 | #include "xdr3.h" |
9a74af21 | 36 | |
5be196e5 | 37 | #ifdef CONFIG_NFSD_V4 |
ffa0160a | 38 | #include "../internal.h" |
2ca72e17 BF |
39 | #include "acl.h" |
40 | #include "idmap.h" | |
a2f4c3fa | 41 | #include "xdr4.h" |
1da177e4 LT |
42 | #endif /* CONFIG_NFSD_V4 */ |
43 | ||
9a74af21 BH |
44 | #include "nfsd.h" |
45 | #include "vfs.h" | |
b4935239 | 46 | #include "filecache.h" |
6e8b50d1 | 47 | #include "trace.h" |
1da177e4 LT |
48 | |
49 | #define NFSDDBG_FACILITY NFSDDBG_FILEOP | |
1da177e4 | 50 | |
cb12fae1 JL |
51 | /** |
52 | * nfserrno - Map Linux errnos to NFS errnos | |
53 | * @errno: POSIX(-ish) error code to be mapped | |
54 | * | |
55 | * Returns the appropriate (net-endian) nfserr_* (or nfs_ok if errno is 0). If | |
56 | * it's an error we don't expect, log it once and return nfserr_io. | |
57 | */ | |
58 | __be32 | |
59 | nfserrno (int errno) | |
60 | { | |
61 | static struct { | |
62 | __be32 nfserr; | |
63 | int syserr; | |
64 | } nfs_errtbl[] = { | |
65 | { nfs_ok, 0 }, | |
66 | { nfserr_perm, -EPERM }, | |
67 | { nfserr_noent, -ENOENT }, | |
68 | { nfserr_io, -EIO }, | |
69 | { nfserr_nxio, -ENXIO }, | |
70 | { nfserr_fbig, -E2BIG }, | |
71 | { nfserr_stale, -EBADF }, | |
72 | { nfserr_acces, -EACCES }, | |
73 | { nfserr_exist, -EEXIST }, | |
74 | { nfserr_xdev, -EXDEV }, | |
75 | { nfserr_mlink, -EMLINK }, | |
76 | { nfserr_nodev, -ENODEV }, | |
77 | { nfserr_notdir, -ENOTDIR }, | |
78 | { nfserr_isdir, -EISDIR }, | |
79 | { nfserr_inval, -EINVAL }, | |
80 | { nfserr_fbig, -EFBIG }, | |
81 | { nfserr_nospc, -ENOSPC }, | |
82 | { nfserr_rofs, -EROFS }, | |
83 | { nfserr_mlink, -EMLINK }, | |
84 | { nfserr_nametoolong, -ENAMETOOLONG }, | |
85 | { nfserr_notempty, -ENOTEMPTY }, | |
86 | { nfserr_dquot, -EDQUOT }, | |
87 | { nfserr_stale, -ESTALE }, | |
88 | { nfserr_jukebox, -ETIMEDOUT }, | |
89 | { nfserr_jukebox, -ERESTARTSYS }, | |
90 | { nfserr_jukebox, -EAGAIN }, | |
91 | { nfserr_jukebox, -EWOULDBLOCK }, | |
92 | { nfserr_jukebox, -ENOMEM }, | |
93 | { nfserr_io, -ETXTBSY }, | |
94 | { nfserr_notsupp, -EOPNOTSUPP }, | |
95 | { nfserr_toosmall, -ETOOSMALL }, | |
96 | { nfserr_serverfault, -ESERVERFAULT }, | |
97 | { nfserr_serverfault, -ENFILE }, | |
98 | { nfserr_io, -EREMOTEIO }, | |
99 | { nfserr_stale, -EOPENSTALE }, | |
100 | { nfserr_io, -EUCLEAN }, | |
101 | { nfserr_perm, -ENOKEY }, | |
102 | { nfserr_no_grace, -ENOGRACE}, | |
103 | }; | |
104 | int i; | |
105 | ||
106 | for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) { | |
107 | if (nfs_errtbl[i].syserr == errno) | |
108 | return nfs_errtbl[i].nfserr; | |
109 | } | |
110 | WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno); | |
111 | return nfserr_io; | |
112 | } | |
113 | ||
1da177e4 LT |
114 | /* |
115 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed | |
116 | * a mount point. | |
e0bb89ef | 117 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
1da177e4 LT |
118 | * or nfs_ok having possibly changed *dpp and *expp |
119 | */ | |
120 | int | |
121 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, | |
122 | struct svc_export **expp) | |
123 | { | |
124 | struct svc_export *exp = *expp, *exp2 = NULL; | |
125 | struct dentry *dentry = *dpp; | |
91c9fa8f AV |
126 | struct path path = {.mnt = mntget(exp->ex_path.mnt), |
127 | .dentry = dget(dentry)}; | |
e1f19857 | 128 | unsigned int follow_flags = 0; |
6264d69d | 129 | int err = 0; |
1da177e4 | 130 | |
e1f19857 RW |
131 | if (exp->ex_flags & NFSEXP_CROSSMOUNT) |
132 | follow_flags = LOOKUP_AUTOMOUNT; | |
133 | ||
134 | err = follow_down(&path, follow_flags); | |
cc53ce53 DH |
135 | if (err < 0) |
136 | goto out; | |
99bbf6ec N |
137 | if (path.mnt == exp->ex_path.mnt && path.dentry == dentry && |
138 | nfsd_mountpoint(dentry, exp) == 2) { | |
139 | /* This is only a mountpoint in some other namespace */ | |
140 | path_put(&path); | |
141 | goto out; | |
142 | } | |
1da177e4 | 143 | |
91c9fa8f | 144 | exp2 = rqst_exp_get_by_name(rqstp, &path); |
1da177e4 | 145 | if (IS_ERR(exp2)) { |
3b6cee7b BF |
146 | err = PTR_ERR(exp2); |
147 | /* | |
148 | * We normally allow NFS clients to continue | |
149 | * "underneath" a mountpoint that is not exported. | |
150 | * The exception is V4ROOT, where no traversal is ever | |
151 | * allowed without an explicit export of the new | |
152 | * directory. | |
153 | */ | |
154 | if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) | |
155 | err = 0; | |
91c9fa8f | 156 | path_put(&path); |
1da177e4 LT |
157 | goto out; |
158 | } | |
3c394dda SD |
159 | if (nfsd_v4client(rqstp) || |
160 | (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { | |
1da177e4 | 161 | /* successfully crossed mount point */ |
1644ccc8 | 162 | /* |
91c9fa8f AV |
163 | * This is subtle: path.dentry is *not* on path.mnt |
164 | * at this point. The only reason we are safe is that | |
165 | * original mnt is pinned down by exp, so we should | |
166 | * put path *before* putting exp | |
1644ccc8 | 167 | */ |
91c9fa8f AV |
168 | *dpp = path.dentry; |
169 | path.dentry = dentry; | |
1644ccc8 | 170 | *expp = exp2; |
91c9fa8f | 171 | exp2 = exp; |
1da177e4 | 172 | } |
91c9fa8f AV |
173 | path_put(&path); |
174 | exp_put(exp2); | |
1da177e4 LT |
175 | out: |
176 | return err; | |
177 | } | |
178 | ||
289ede45 BF |
179 | static void follow_to_parent(struct path *path) |
180 | { | |
181 | struct dentry *dp; | |
182 | ||
183 | while (path->dentry == path->mnt->mnt_root && follow_up(path)) | |
184 | ; | |
185 | dp = dget_parent(path->dentry); | |
186 | dput(path->dentry); | |
187 | path->dentry = dp; | |
188 | } | |
189 | ||
190 | static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) | |
191 | { | |
192 | struct svc_export *exp2; | |
193 | struct path path = {.mnt = mntget((*exp)->ex_path.mnt), | |
194 | .dentry = dget(dparent)}; | |
195 | ||
196 | follow_to_parent(&path); | |
197 | ||
198 | exp2 = rqst_exp_parent(rqstp, &path); | |
199 | if (PTR_ERR(exp2) == -ENOENT) { | |
200 | *dentryp = dget(dparent); | |
201 | } else if (IS_ERR(exp2)) { | |
202 | path_put(&path); | |
203 | return PTR_ERR(exp2); | |
204 | } else { | |
205 | *dentryp = dget(path.dentry); | |
206 | exp_put(*exp); | |
207 | *exp = exp2; | |
208 | } | |
209 | path_put(&path); | |
210 | return 0; | |
211 | } | |
212 | ||
82ead7fe BF |
213 | /* |
214 | * For nfsd purposes, we treat V4ROOT exports as though there was an | |
215 | * export at *every* directory. | |
99bbf6ec N |
216 | * We return: |
217 | * '1' if this dentry *must* be an export point, | |
218 | * '2' if it might be, if there is really a mount here, and | |
219 | * '0' if there is no chance of an export point here. | |
82ead7fe | 220 | */ |
3227fa41 | 221 | int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) |
82ead7fe | 222 | { |
99bbf6ec N |
223 | if (!d_inode(dentry)) |
224 | return 0; | |
225 | if (exp->ex_flags & NFSEXP_V4ROOT) | |
82ead7fe | 226 | return 1; |
11fcee02 TM |
227 | if (nfsd4_is_junction(dentry)) |
228 | return 1; | |
50f5fdae | 229 | if (d_managed(dentry)) |
99bbf6ec N |
230 | /* |
231 | * Might only be a mountpoint in a different namespace, | |
232 | * but we need to check. | |
233 | */ | |
234 | return 2; | |
235 | return 0; | |
82ead7fe BF |
236 | } |
237 | ||
6264d69d | 238 | __be32 |
6c0a654d | 239 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
5a022fc8 | 240 | const char *name, unsigned int len, |
6c0a654d | 241 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
1da177e4 LT |
242 | { |
243 | struct svc_export *exp; | |
244 | struct dentry *dparent; | |
245 | struct dentry *dentry; | |
6264d69d | 246 | int host_err; |
1da177e4 LT |
247 | |
248 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); | |
249 | ||
1da177e4 | 250 | dparent = fhp->fh_dentry; |
bf18f163 | 251 | exp = exp_get(fhp->fh_export); |
1da177e4 | 252 | |
1da177e4 LT |
253 | /* Lookup the name, but don't follow links */ |
254 | if (isdotent(name, len)) { | |
255 | if (len==1) | |
256 | dentry = dget(dparent); | |
54775491 | 257 | else if (dparent != exp->ex_path.dentry) |
1da177e4 | 258 | dentry = dget_parent(dparent); |
fed83811 | 259 | else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) |
1da177e4 LT |
260 | dentry = dget(dparent); /* .. == . just like at / */ |
261 | else { | |
262 | /* checking mountpoint crossing is very different when stepping up */ | |
289ede45 BF |
263 | host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); |
264 | if (host_err) | |
1da177e4 | 265 | goto out_nfserr; |
1da177e4 LT |
266 | } |
267 | } else { | |
19d008b4 | 268 | dentry = lookup_one_len_unlocked(name, dparent, len); |
6264d69d | 269 | host_err = PTR_ERR(dentry); |
1da177e4 LT |
270 | if (IS_ERR(dentry)) |
271 | goto out_nfserr; | |
82ead7fe | 272 | if (nfsd_mountpoint(dentry, exp)) { |
19d008b4 N |
273 | host_err = nfsd_cross_mnt(rqstp, &dentry, &exp); |
274 | if (host_err) { | |
1da177e4 LT |
275 | dput(dentry); |
276 | goto out_nfserr; | |
277 | } | |
278 | } | |
279 | } | |
6c0a654d BF |
280 | *dentry_ret = dentry; |
281 | *exp_ret = exp; | |
282 | return 0; | |
283 | ||
284 | out_nfserr: | |
285 | exp_put(exp); | |
286 | return nfserrno(host_err); | |
287 | } | |
288 | ||
19d008b4 N |
289 | /** |
290 | * nfsd_lookup - look up a single path component for nfsd | |
291 | * | |
292 | * @rqstp: the request context | |
293 | * @fhp: the file handle of the directory | |
294 | * @name: the component name, or %NULL to look up parent | |
295 | * @len: length of name to examine | |
296 | * @resfh: pointer to pre-initialised filehandle to hold result. | |
297 | * | |
6c0a654d BF |
298 | * Look up one component of a pathname. |
299 | * N.B. After this call _both_ fhp and resfh need an fh_put | |
300 | * | |
301 | * If the lookup would cross a mountpoint, and the mounted filesystem | |
302 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is | |
303 | * accepted as it stands and the mounted directory is | |
304 | * returned. Otherwise the covered directory is returned. | |
305 | * NOTE: this mountpoint crossing is not supported properly by all | |
306 | * clients and is explicitly disallowed for NFSv3 | |
19d008b4 | 307 | * |
6c0a654d BF |
308 | */ |
309 | __be32 | |
310 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, | |
19d008b4 | 311 | unsigned int len, struct svc_fh *resfh) |
6c0a654d BF |
312 | { |
313 | struct svc_export *exp; | |
314 | struct dentry *dentry; | |
315 | __be32 err; | |
316 | ||
29a78a3e BF |
317 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
318 | if (err) | |
319 | return err; | |
6c0a654d BF |
320 | err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); |
321 | if (err) | |
322 | return err; | |
32c1eb0c AA |
323 | err = check_nfsd_access(exp, rqstp); |
324 | if (err) | |
325 | goto out; | |
1da177e4 LT |
326 | /* |
327 | * Note: we compose the file handle now, but as the | |
328 | * dentry may be negative, it may need to be updated. | |
329 | */ | |
330 | err = fh_compose(resfh, exp, dentry, fhp); | |
2b0143b5 | 331 | if (!err && d_really_is_negative(dentry)) |
1da177e4 | 332 | err = nfserr_noent; |
32c1eb0c | 333 | out: |
1da177e4 | 334 | dput(dentry); |
1da177e4 LT |
335 | exp_put(exp); |
336 | return err; | |
1da177e4 LT |
337 | } |
338 | ||
1b2021bd TM |
339 | static void |
340 | commit_reset_write_verifier(struct nfsd_net *nn, struct svc_rqst *rqstp, | |
341 | int err) | |
342 | { | |
343 | switch (err) { | |
344 | case -EAGAIN: | |
345 | case -ESTALE: | |
346 | /* | |
347 | * Neither of these are the result of a problem with | |
348 | * durable storage, so avoid a write verifier reset. | |
349 | */ | |
350 | break; | |
351 | default: | |
352 | nfsd_reset_write_verifier(nn); | |
353 | trace_nfsd_writeverf_reset(nn, rqstp, err); | |
354 | } | |
355 | } | |
356 | ||
f501912a BM |
357 | /* |
358 | * Commit metadata changes to stable storage. | |
359 | */ | |
360 | static int | |
57f64034 | 361 | commit_inode_metadata(struct inode *inode) |
f501912a | 362 | { |
f501912a | 363 | const struct export_operations *export_ops = inode->i_sb->s_export_op; |
f501912a | 364 | |
c3765016 CH |
365 | if (export_ops->commit_metadata) |
366 | return export_ops->commit_metadata(inode); | |
367 | return sync_inode_metadata(inode, 1); | |
f501912a | 368 | } |
6c0a654d | 369 | |
57f64034 TM |
370 | static int |
371 | commit_metadata(struct svc_fh *fhp) | |
372 | { | |
373 | struct inode *inode = d_inode(fhp->fh_dentry); | |
374 | ||
375 | if (!EX_ISSYNC(fhp->fh_export)) | |
376 | return 0; | |
377 | return commit_inode_metadata(inode); | |
378 | } | |
379 | ||
1da177e4 | 380 | /* |
818e5a22 CH |
381 | * Go over the attributes and take care of the small differences between |
382 | * NFS semantics and what Linux expects. | |
1da177e4 | 383 | */ |
818e5a22 CH |
384 | static void |
385 | nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) | |
1da177e4 | 386 | { |
00801cd9 N |
387 | /* Ignore mode updates on symlinks */ |
388 | if (S_ISLNK(inode->i_mode)) | |
389 | iap->ia_valid &= ~ATTR_MODE; | |
390 | ||
ca456252 | 391 | /* sanitize the mode change */ |
1da177e4 LT |
392 | if (iap->ia_valid & ATTR_MODE) { |
393 | iap->ia_mode &= S_IALLUGO; | |
dee3209d | 394 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
ca456252 JL |
395 | } |
396 | ||
397 | /* Revoke setuid/setgid on chown */ | |
0953e620 | 398 | if (!S_ISDIR(inode->i_mode) && |
c4fa6d7c | 399 | ((iap->ia_valid & ATTR_UID) || (iap->ia_valid & ATTR_GID))) { |
ca456252 JL |
400 | iap->ia_valid |= ATTR_KILL_PRIV; |
401 | if (iap->ia_valid & ATTR_MODE) { | |
402 | /* we're setting mode too, just clear the s*id bits */ | |
8a0ce7d9 | 403 | iap->ia_mode &= ~S_ISUID; |
ca456252 JL |
404 | if (iap->ia_mode & S_IXGRP) |
405 | iap->ia_mode &= ~S_ISGID; | |
406 | } else { | |
407 | /* set ATTR_KILL_* bits and let VFS handle it */ | |
2d8ae8c4 CB |
408 | iap->ia_valid |= ATTR_KILL_SUID; |
409 | iap->ia_valid |= | |
410 | setattr_should_drop_sgid(&nop_mnt_idmap, inode); | |
8a0ce7d9 | 411 | } |
1da177e4 | 412 | } |
818e5a22 CH |
413 | } |
414 | ||
0839ffb8 BF |
415 | static __be32 |
416 | nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
417 | struct iattr *iap) | |
418 | { | |
419 | struct inode *inode = d_inode(fhp->fh_dentry); | |
0839ffb8 BF |
420 | |
421 | if (iap->ia_size < inode->i_size) { | |
422 | __be32 err; | |
423 | ||
424 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, | |
425 | NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); | |
426 | if (err) | |
427 | return err; | |
428 | } | |
f7e33bdb | 429 | return nfserrno(get_write_access(inode)); |
0839ffb8 BF |
430 | } |
431 | ||
c0aa1913 CL |
432 | static int __nfsd_setattr(struct dentry *dentry, struct iattr *iap) |
433 | { | |
434 | int host_err; | |
435 | ||
436 | if (iap->ia_valid & ATTR_SIZE) { | |
437 | /* | |
438 | * RFC5661, Section 18.30.4: | |
439 | * Changing the size of a file with SETATTR indirectly | |
440 | * changes the time_modify and change attributes. | |
441 | * | |
442 | * (and similar for the older RFCs) | |
443 | */ | |
444 | struct iattr size_attr = { | |
445 | .ia_valid = ATTR_SIZE | ATTR_CTIME | ATTR_MTIME, | |
446 | .ia_size = iap->ia_size, | |
447 | }; | |
448 | ||
449 | if (iap->ia_size < 0) | |
450 | return -EFBIG; | |
451 | ||
abf08576 | 452 | host_err = notify_change(&nop_mnt_idmap, dentry, &size_attr, NULL); |
c0aa1913 CL |
453 | if (host_err) |
454 | return host_err; | |
455 | iap->ia_valid &= ~ATTR_SIZE; | |
456 | ||
457 | /* | |
458 | * Avoid the additional setattr call below if the only other | |
459 | * attribute that the client sends is the mtime, as we update | |
460 | * it as part of the size change above. | |
461 | */ | |
462 | if ((iap->ia_valid & ~ATTR_MTIME) == 0) | |
463 | return 0; | |
464 | } | |
465 | ||
466 | if (!iap->ia_valid) | |
467 | return 0; | |
468 | ||
469 | iap->ia_valid |= ATTR_CTIME; | |
abf08576 | 470 | return notify_change(&nop_mnt_idmap, dentry, iap, NULL); |
c0aa1913 CL |
471 | } |
472 | ||
473 | /** | |
474 | * nfsd_setattr - Set various file attributes. | |
475 | * @rqstp: controlling RPC transaction | |
476 | * @fhp: filehandle of target | |
477 | * @attr: attributes to set | |
c0aa1913 CL |
478 | * @guardtime: do not act if ctime.tv_sec does not match this timestamp |
479 | * | |
480 | * This call may adjust the contents of @attr (in particular, this | |
481 | * call may change the bits in the na_iattr.ia_valid field). | |
482 | * | |
483 | * Returns nfs_ok on success, otherwise an NFS status code is | |
484 | * returned. Caller must release @fhp by calling fh_put in either | |
485 | * case. | |
818e5a22 CH |
486 | */ |
487 | __be32 | |
7fe2a71d | 488 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, |
24d92de9 | 489 | struct nfsd_attrs *attr, const struct timespec64 *guardtime) |
818e5a22 CH |
490 | { |
491 | struct dentry *dentry; | |
492 | struct inode *inode; | |
7fe2a71d | 493 | struct iattr *iap = attr->na_iattr; |
818e5a22 CH |
494 | int accmode = NFSD_MAY_SATTR; |
495 | umode_t ftype = 0; | |
496 | __be32 err; | |
6412e44c | 497 | int host_err = 0; |
9f67f189 | 498 | bool get_write_count; |
758e99fe | 499 | bool size_change = (iap->ia_valid & ATTR_SIZE); |
34b91dda | 500 | int retries; |
818e5a22 | 501 | |
255fbca6 | 502 | if (iap->ia_valid & ATTR_SIZE) { |
818e5a22 | 503 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; |
818e5a22 | 504 | ftype = S_IFREG; |
255fbca6 | 505 | } |
506 | ||
507 | /* | |
508 | * If utimes(2) and friends are called with times not NULL, we should | |
509 | * not set NFSD_MAY_WRITE bit. Otherwise fh_verify->nfsd_permission | |
e977cc83 | 510 | * will return EACCES, when the caller's effective UID does not match |
255fbca6 | 511 | * the owner of the file, and the caller is not privileged. In this |
512 | * situation, we should return EPERM(notify_change will return this). | |
513 | */ | |
514 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME)) { | |
515 | accmode |= NFSD_MAY_OWNER_OVERRIDE; | |
516 | if (!(iap->ia_valid & (ATTR_ATIME_SET | ATTR_MTIME_SET))) | |
517 | accmode |= NFSD_MAY_WRITE; | |
518 | } | |
818e5a22 | 519 | |
9f67f189 BF |
520 | /* Callers that do fh_verify should do the fh_want_write: */ |
521 | get_write_count = !fhp->fh_dentry; | |
522 | ||
818e5a22 CH |
523 | /* Get inode */ |
524 | err = fh_verify(rqstp, fhp, ftype, accmode); | |
525 | if (err) | |
758e99fe | 526 | return err; |
9f67f189 BF |
527 | if (get_write_count) { |
528 | host_err = fh_want_write(fhp); | |
529 | if (host_err) | |
758e99fe | 530 | goto out; |
9f67f189 | 531 | } |
818e5a22 CH |
532 | |
533 | dentry = fhp->fh_dentry; | |
2b0143b5 | 534 | inode = d_inode(dentry); |
818e5a22 | 535 | |
818e5a22 CH |
536 | nfsd_sanitize_attrs(inode, iap); |
537 | ||
538 | /* | |
539 | * The size case is special, it changes the file in addition to the | |
783112f7 CH |
540 | * attributes, and file systems don't expect it to be mixed with |
541 | * "random" attribute changes. We thus split out the size change | |
542 | * into a separate call to ->setattr, and do the rest as a separate | |
543 | * setattr call. | |
818e5a22 | 544 | */ |
758e99fe | 545 | if (size_change) { |
0839ffb8 BF |
546 | err = nfsd_get_write_access(rqstp, fhp, iap); |
547 | if (err) | |
758e99fe | 548 | return err; |
783112f7 | 549 | } |
f0c63124 | 550 | |
bb4d53d6 | 551 | inode_lock(inode); |
6412e44c TM |
552 | err = fh_fill_pre_attrs(fhp); |
553 | if (err) | |
554 | goto out_unlock; | |
24d92de9 TM |
555 | |
556 | if (guardtime) { | |
557 | struct timespec64 ctime = inode_get_ctime(inode); | |
558 | if ((u32)guardtime->tv_sec != (u32)ctime.tv_sec || | |
559 | guardtime->tv_nsec != ctime.tv_nsec) { | |
560 | err = nfserr_notsync; | |
561 | goto out_fill_attrs; | |
562 | } | |
563 | } | |
564 | ||
34b91dda | 565 | for (retries = 1;;) { |
d53d7008 JL |
566 | struct iattr attrs; |
567 | ||
568 | /* | |
569 | * notify_change() can alter its iattr argument, making | |
570 | * @iap unsuitable for submission multiple times. Make a | |
571 | * copy for every loop iteration. | |
572 | */ | |
573 | attrs = *iap; | |
574 | host_err = __nfsd_setattr(dentry, &attrs); | |
34b91dda CL |
575 | if (host_err != -EAGAIN || !retries--) |
576 | break; | |
577 | if (!nfsd_wait_for_delegreturn(rqstp, inode)) | |
578 | break; | |
579 | } | |
d6a97d3f N |
580 | if (attr->na_seclabel && attr->na_seclabel->len) |
581 | attr->na_labelerr = security_inode_setsecctx(dentry, | |
582 | attr->na_seclabel->data, attr->na_seclabel->len); | |
c0cbe707 | 583 | if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && attr->na_pacl) |
13e83a49 | 584 | attr->na_aclerr = set_posix_acl(&nop_mnt_idmap, |
138060ba | 585 | dentry, ACL_TYPE_ACCESS, |
c0cbe707 N |
586 | attr->na_pacl); |
587 | if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && | |
588 | !attr->na_aclerr && attr->na_dpacl && S_ISDIR(inode->i_mode)) | |
13e83a49 | 589 | attr->na_aclerr = set_posix_acl(&nop_mnt_idmap, |
138060ba | 590 | dentry, ACL_TYPE_DEFAULT, |
c0cbe707 | 591 | attr->na_dpacl); |
24d92de9 | 592 | out_fill_attrs: |
7d5a352c CL |
593 | /* |
594 | * RFC 1813 Section 3.3.2 does not mandate that an NFS server | |
595 | * returns wcc_data for SETATTR. Some client implementations | |
596 | * depend on receiving wcc_data, however, to sort out partial | |
597 | * updates (eg., the client requested that size and mode be | |
598 | * modified, but the server changed only the file mode). | |
599 | */ | |
6412e44c TM |
600 | fh_fill_post_attrs(fhp); |
601 | out_unlock: | |
bb4d53d6 | 602 | inode_unlock(inode); |
0839ffb8 BF |
603 | if (size_change) |
604 | put_write_access(inode); | |
0839ffb8 | 605 | out: |
758e99fe CH |
606 | if (!host_err) |
607 | host_err = commit_metadata(fhp); | |
6412e44c | 608 | return err != 0 ? err : nfserrno(host_err); |
1da177e4 LT |
609 | } |
610 | ||
5be196e5 | 611 | #if defined(CONFIG_NFSD_V4) |
9b4146e8 CL |
612 | /* |
613 | * NFS junction information is stored in an extended attribute. | |
614 | */ | |
615 | #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" | |
616 | ||
617 | /** | |
618 | * nfsd4_is_junction - Test if an object could be an NFS junction | |
619 | * | |
620 | * @dentry: object to test | |
621 | * | |
622 | * Returns 1 if "dentry" appears to contain NFS junction information. | |
623 | * Otherwise 0 is returned. | |
624 | */ | |
11fcee02 TM |
625 | int nfsd4_is_junction(struct dentry *dentry) |
626 | { | |
2b0143b5 | 627 | struct inode *inode = d_inode(dentry); |
11fcee02 TM |
628 | |
629 | if (inode == NULL) | |
630 | return 0; | |
631 | if (inode->i_mode & S_IXUGO) | |
632 | return 0; | |
633 | if (!(inode->i_mode & S_ISVTX)) | |
634 | return 0; | |
4609e1f1 | 635 | if (vfs_getxattr(&nop_mnt_idmap, dentry, NFSD_JUNCTION_XATTR_NAME, |
c7c7a1a1 | 636 | NULL, 0) <= 0) |
11fcee02 TM |
637 | return 0; |
638 | return 1; | |
639 | } | |
18032ca0 | 640 | |
a2f4c3fa TM |
641 | static struct nfsd4_compound_state *nfsd4_get_cstate(struct svc_rqst *rqstp) |
642 | { | |
643 | return &((struct nfsd4_compoundres *)rqstp->rq_resp)->cstate; | |
644 | } | |
645 | ||
646 | __be32 nfsd4_clone_file_range(struct svc_rqst *rqstp, | |
647 | struct nfsd_file *nf_src, u64 src_pos, | |
648 | struct nfsd_file *nf_dst, u64 dst_pos, | |
649 | u64 count, bool sync) | |
ffa0160a | 650 | { |
b66ae6dd TM |
651 | struct file *src = nf_src->nf_file; |
652 | struct file *dst = nf_dst->nf_file; | |
555dbf1a | 653 | errseq_t since; |
42ec3d4c | 654 | loff_t cloned; |
1b28d756 | 655 | __be32 ret = 0; |
42ec3d4c | 656 | |
555dbf1a | 657 | since = READ_ONCE(dst->f_wb_err); |
452ce659 | 658 | cloned = vfs_clone_file_range(src, src_pos, dst, dst_pos, count, 0); |
1b28d756 TM |
659 | if (cloned < 0) { |
660 | ret = nfserrno(cloned); | |
661 | goto out_err; | |
662 | } | |
663 | if (count && cloned != count) { | |
664 | ret = nfserrno(-EINVAL); | |
665 | goto out_err; | |
666 | } | |
a25e3726 TM |
667 | if (sync) { |
668 | loff_t dst_end = count ? dst_pos + count - 1 : LLONG_MAX; | |
669 | int status = vfs_fsync_range(dst, dst_pos, dst_end, 0); | |
57f64034 | 670 | |
555dbf1a TM |
671 | if (!status) |
672 | status = filemap_check_wb_err(dst->f_mapping, since); | |
57f64034 TM |
673 | if (!status) |
674 | status = commit_inode_metadata(file_inode(src)); | |
1b28d756 | 675 | if (status < 0) { |
75acacb6 CL |
676 | struct nfsd_net *nn = net_generic(nf_dst->nf_net, |
677 | nfsd_net_id); | |
678 | ||
a2f4c3fa TM |
679 | trace_nfsd_clone_file_range_err(rqstp, |
680 | &nfsd4_get_cstate(rqstp)->save_fh, | |
681 | src_pos, | |
682 | &nfsd4_get_cstate(rqstp)->current_fh, | |
683 | dst_pos, | |
684 | count, status); | |
1b2021bd | 685 | commit_reset_write_verifier(nn, rqstp, status); |
1b28d756 TM |
686 | ret = nfserrno(status); |
687 | } | |
a25e3726 | 688 | } |
1b28d756 | 689 | out_err: |
1b28d756 | 690 | return ret; |
ffa0160a CH |
691 | } |
692 | ||
29ae7f9d AS |
693 | ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst, |
694 | u64 dst_pos, u64 count) | |
695 | { | |
868f9f2f | 696 | ssize_t ret; |
29ae7f9d AS |
697 | |
698 | /* | |
699 | * Limit copy to 4MB to prevent indefinitely blocking an nfsd | |
700 | * thread and client rpc slot. The choice of 4MB is somewhat | |
701 | * arbitrary. We might instead base this on r/wsize, or make it | |
702 | * tunable, or use a time instead of a byte limit, or implement | |
703 | * asynchronous copy. In theory a client could also recognize a | |
704 | * limit like this and pipeline multiple COPY requests. | |
705 | */ | |
706 | count = min_t(u64, count, 1 << 22); | |
868f9f2f AG |
707 | ret = vfs_copy_file_range(src, src_pos, dst, dst_pos, count, 0); |
708 | ||
709 | if (ret == -EOPNOTSUPP || ret == -EXDEV) | |
10bc8e4a AG |
710 | ret = vfs_copy_file_range(src, src_pos, dst, dst_pos, count, |
711 | COPY_FILE_SPLICE); | |
868f9f2f | 712 | return ret; |
29ae7f9d AS |
713 | } |
714 | ||
95d871f0 AS |
715 | __be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp, |
716 | struct file *file, loff_t offset, loff_t len, | |
717 | int flags) | |
718 | { | |
95d871f0 AS |
719 | int error; |
720 | ||
721 | if (!S_ISREG(file_inode(file)->i_mode)) | |
722 | return nfserr_inval; | |
723 | ||
95d871f0 AS |
724 | error = vfs_fallocate(file, flags, offset, len); |
725 | if (!error) | |
726 | error = commit_metadata(fhp); | |
727 | ||
728 | return nfserrno(error); | |
729 | } | |
6a85d6c7 | 730 | #endif /* defined(CONFIG_NFSD_V4) */ |
1da177e4 | 731 | |
1da177e4 LT |
732 | /* |
733 | * Check server access rights to a file system object | |
734 | */ | |
735 | struct accessmap { | |
736 | u32 access; | |
737 | int how; | |
738 | }; | |
739 | static struct accessmap nfs3_regaccess[] = { | |
8837abca MS |
740 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
741 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
742 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, | |
743 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, | |
1da177e4 | 744 | |
c11d7fd1 FL |
745 | #ifdef CONFIG_NFSD_V4 |
746 | { NFS4_ACCESS_XAREAD, NFSD_MAY_READ }, | |
747 | { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE }, | |
748 | { NFS4_ACCESS_XALIST, NFSD_MAY_READ }, | |
749 | #endif | |
750 | ||
1da177e4 LT |
751 | { 0, 0 } |
752 | }; | |
753 | ||
754 | static struct accessmap nfs3_diraccess[] = { | |
8837abca MS |
755 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
756 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, | |
757 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, | |
758 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, | |
759 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, | |
1da177e4 | 760 | |
c11d7fd1 FL |
761 | #ifdef CONFIG_NFSD_V4 |
762 | { NFS4_ACCESS_XAREAD, NFSD_MAY_READ }, | |
763 | { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE }, | |
764 | { NFS4_ACCESS_XALIST, NFSD_MAY_READ }, | |
765 | #endif | |
766 | ||
1da177e4 LT |
767 | { 0, 0 } |
768 | }; | |
769 | ||
770 | static struct accessmap nfs3_anyaccess[] = { | |
771 | /* Some clients - Solaris 2.6 at least, make an access call | |
772 | * to the server to check for access for things like /dev/null | |
773 | * (which really, the server doesn't care about). So | |
774 | * We provide simple access checking for them, looking | |
775 | * mainly at mode bits, and we make sure to ignore read-only | |
776 | * filesystem checks | |
777 | */ | |
8837abca MS |
778 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
779 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
780 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
781 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
1da177e4 LT |
782 | |
783 | { 0, 0 } | |
784 | }; | |
785 | ||
6264d69d | 786 | __be32 |
1da177e4 LT |
787 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
788 | { | |
789 | struct accessmap *map; | |
790 | struct svc_export *export; | |
791 | struct dentry *dentry; | |
792 | u32 query, result = 0, sresult = 0; | |
6264d69d | 793 | __be32 error; |
1da177e4 | 794 | |
8837abca | 795 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
796 | if (error) |
797 | goto out; | |
798 | ||
799 | export = fhp->fh_export; | |
800 | dentry = fhp->fh_dentry; | |
801 | ||
e36cb0b8 | 802 | if (d_is_reg(dentry)) |
1da177e4 | 803 | map = nfs3_regaccess; |
e36cb0b8 | 804 | else if (d_is_dir(dentry)) |
1da177e4 LT |
805 | map = nfs3_diraccess; |
806 | else | |
807 | map = nfs3_anyaccess; | |
808 | ||
809 | ||
810 | query = *access; | |
811 | for (; map->access; map++) { | |
812 | if (map->access & query) { | |
6264d69d | 813 | __be32 err2; |
1da177e4 LT |
814 | |
815 | sresult |= map->access; | |
816 | ||
0ec757df | 817 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
1da177e4 LT |
818 | switch (err2) { |
819 | case nfs_ok: | |
820 | result |= map->access; | |
821 | break; | |
822 | ||
823 | /* the following error codes just mean the access was not allowed, | |
824 | * rather than an error occurred */ | |
825 | case nfserr_rofs: | |
826 | case nfserr_acces: | |
827 | case nfserr_perm: | |
828 | /* simply don't "or" in the access bit. */ | |
829 | break; | |
830 | default: | |
831 | error = err2; | |
832 | goto out; | |
833 | } | |
834 | } | |
835 | } | |
836 | *access = result; | |
837 | if (supported) | |
838 | *supported = sresult; | |
839 | ||
840 | out: | |
841 | return error; | |
842 | } | |
1da177e4 | 843 | |
65294c1f | 844 | int nfsd_open_break_lease(struct inode *inode, int access) |
105f4622 BF |
845 | { |
846 | unsigned int mode; | |
1da177e4 | 847 | |
105f4622 BF |
848 | if (access & NFSD_MAY_NOT_BREAK_LEASE) |
849 | return 0; | |
850 | mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; | |
851 | return break_lease(inode, mode | O_NONBLOCK); | |
852 | } | |
1da177e4 LT |
853 | |
854 | /* | |
855 | * Open an existing file or directory. | |
999448a8 BS |
856 | * The may_flags argument indicates the type of open (read/write/lock) |
857 | * and additional flags. | |
1da177e4 LT |
858 | * N.B. After this call fhp needs an fh_put |
859 | */ | |
d59b3515 | 860 | static int |
65294c1f | 861 | __nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, |
999448a8 | 862 | int may_flags, struct file **filp) |
1da177e4 | 863 | { |
765927b2 | 864 | struct path path; |
1da177e4 | 865 | struct inode *inode; |
8519f994 | 866 | struct file *file; |
6264d69d | 867 | int flags = O_RDONLY|O_LARGEFILE; |
d59b3515 | 868 | int host_err = -EPERM; |
1da177e4 | 869 | |
765927b2 AV |
870 | path.mnt = fhp->fh_export->ex_path.mnt; |
871 | path.dentry = fhp->fh_dentry; | |
2b0143b5 | 872 | inode = d_inode(path.dentry); |
1da177e4 | 873 | |
999448a8 | 874 | if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) |
1da177e4 | 875 | goto out; |
1da177e4 LT |
876 | |
877 | if (!inode->i_fop) | |
878 | goto out; | |
879 | ||
999448a8 | 880 | host_err = nfsd_open_break_lease(inode, may_flags); |
6264d69d | 881 | if (host_err) /* NOMEM or WOULDBLOCK */ |
d59b3515 | 882 | goto out; |
1da177e4 | 883 | |
999448a8 BS |
884 | if (may_flags & NFSD_MAY_WRITE) { |
885 | if (may_flags & NFSD_MAY_READ) | |
9ecb6a08 BF |
886 | flags = O_RDWR|O_LARGEFILE; |
887 | else | |
888 | flags = O_WRONLY|O_LARGEFILE; | |
1da177e4 | 889 | } |
999448a8 | 890 | |
8519f994 KM |
891 | file = dentry_open(&path, flags, current_cred()); |
892 | if (IS_ERR(file)) { | |
893 | host_err = PTR_ERR(file); | |
d59b3515 | 894 | goto out; |
8519f994 KM |
895 | } |
896 | ||
8f46ff57 | 897 | host_err = security_file_post_open(file, may_flags); |
8519f994 | 898 | if (host_err) { |
fd891454 | 899 | fput(file); |
d59b3515 | 900 | goto out; |
06effdbb BS |
901 | } |
902 | ||
8519f994 KM |
903 | if (may_flags & NFSD_MAY_64BIT_COOKIE) |
904 | file->f_mode |= FMODE_64BITHASH; | |
905 | else | |
906 | file->f_mode |= FMODE_32BITHASH; | |
907 | ||
908 | *filp = file; | |
1da177e4 | 909 | out: |
d59b3515 | 910 | return host_err; |
65294c1f JL |
911 | } |
912 | ||
913 | __be32 | |
914 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, | |
915 | int may_flags, struct file **filp) | |
916 | { | |
917 | __be32 err; | |
d59b3515 | 918 | int host_err; |
12bcbd40 | 919 | bool retried = false; |
65294c1f | 920 | |
65294c1f JL |
921 | /* |
922 | * If we get here, then the client has already done an "open", | |
923 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE | |
924 | * in case a chmod has now revoked permission. | |
925 | * | |
926 | * Arguably we should also allow the owner override for | |
927 | * directories, but we never have and it doesn't seem to have | |
928 | * caused anyone a problem. If we were to change this, note | |
929 | * also that our filldir callbacks would need a variant of | |
930 | * lookup_one_len that doesn't check permissions. | |
931 | */ | |
932 | if (type == S_IFREG) | |
933 | may_flags |= NFSD_MAY_OWNER_OVERRIDE; | |
12bcbd40 | 934 | retry: |
65294c1f | 935 | err = fh_verify(rqstp, fhp, type, may_flags); |
12bcbd40 | 936 | if (!err) { |
d59b3515 TM |
937 | host_err = __nfsd_open(rqstp, fhp, type, may_flags, filp); |
938 | if (host_err == -EOPENSTALE && !retried) { | |
12bcbd40 JL |
939 | retried = true; |
940 | fh_put(fhp); | |
941 | goto retry; | |
942 | } | |
d59b3515 | 943 | err = nfserrno(host_err); |
12bcbd40 | 944 | } |
65294c1f JL |
945 | return err; |
946 | } | |
947 | ||
f4d84c52 CL |
948 | /** |
949 | * nfsd_open_verified - Open a regular file for the filecache | |
950 | * @rqstp: RPC request | |
951 | * @fhp: NFS filehandle of the file to open | |
952 | * @may_flags: internal permission flags | |
953 | * @filp: OUT: open "struct file *" | |
954 | * | |
d59b3515 | 955 | * Returns zero on success, or a negative errno value. |
f4d84c52 | 956 | */ |
d59b3515 | 957 | int |
f4d84c52 CL |
958 | nfsd_open_verified(struct svc_rqst *rqstp, struct svc_fh *fhp, int may_flags, |
959 | struct file **filp) | |
65294c1f | 960 | { |
ae191417 | 961 | return __nfsd_open(rqstp, fhp, S_IFREG, may_flags, filp); |
1da177e4 LT |
962 | } |
963 | ||
1da177e4 | 964 | /* |
cf8208d0 | 965 | * Grab and keep cached pages associated with a file in the svc_rqst |
dc97391e | 966 | * so that they can be passed to the network sendmsg routines |
cf8208d0 | 967 | * directly. They will be released after the sending has completed. |
0f516248 CL |
968 | * |
969 | * Return values: Number of bytes consumed, or -EIO if there are no | |
970 | * remaining pages in rqstp->rq_pages. | |
1da177e4 LT |
971 | */ |
972 | static int | |
cf8208d0 JA |
973 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
974 | struct splice_desc *sd) | |
1da177e4 | 975 | { |
cf8208d0 | 976 | struct svc_rqst *rqstp = sd->u.data; |
bfbfb618 AV |
977 | struct page *page = buf->page; // may be a compound one |
978 | unsigned offset = buf->offset; | |
ac8db824 | 979 | struct page *last_page; |
bfbfb618 | 980 | |
ac8db824 | 981 | last_page = page + (offset + sd->len - 1) / PAGE_SIZE; |
27c934dd JL |
982 | for (page += offset / PAGE_SIZE; page <= last_page; page++) { |
983 | /* | |
101df45e DH |
984 | * Skip page replacement when extending the contents of the |
985 | * current page. But note that we may get two zero_pages in a | |
986 | * row from shmem. | |
27c934dd | 987 | */ |
101df45e DH |
988 | if (page == *(rqstp->rq_next_page - 1) && |
989 | offset_in_page(rqstp->rq_res.page_base + | |
990 | rqstp->rq_res.page_len)) | |
27c934dd | 991 | continue; |
0f516248 CL |
992 | if (unlikely(!svc_rqst_replace_page(rqstp, page))) |
993 | return -EIO; | |
27c934dd | 994 | } |
bfbfb618 AV |
995 | if (rqstp->rq_res.page_len == 0) // first call |
996 | rqstp->rq_res.page_base = offset % PAGE_SIZE; | |
c7e0b781 | 997 | rqstp->rq_res.page_len += sd->len; |
c7e0b781 | 998 | return sd->len; |
1da177e4 LT |
999 | } |
1000 | ||
cf8208d0 JA |
1001 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
1002 | struct splice_desc *sd) | |
1003 | { | |
1004 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
1005 | } | |
1006 | ||
83a63072 TM |
1007 | static u32 nfsd_eof_on_read(struct file *file, loff_t offset, ssize_t len, |
1008 | size_t expected) | |
1009 | { | |
1010 | if (expected != 0 && len == 0) | |
1011 | return 1; | |
1012 | if (offset+len >= i_size_read(file_inode(file))) | |
1013 | return 1; | |
1014 | return 0; | |
1015 | } | |
1016 | ||
87c5942e CL |
1017 | static __be32 nfsd_finish_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1018 | struct file *file, loff_t offset, | |
83a63072 | 1019 | unsigned long *count, u32 *eof, ssize_t host_err) |
1da177e4 | 1020 | { |
6264d69d | 1021 | if (host_err >= 0) { |
4b148854 JB |
1022 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
1023 | ||
1024 | nfsd_stats_io_read_add(nn, fhp->fh_export, host_err); | |
83a63072 | 1025 | *eof = nfsd_eof_on_read(file, offset, host_err, *count); |
6264d69d | 1026 | *count = host_err; |
2a12a9d7 | 1027 | fsnotify_access(file); |
87c5942e | 1028 | trace_nfsd_read_io_done(rqstp, fhp, offset, *count); |
dc97618d | 1029 | return 0; |
87c5942e CL |
1030 | } else { |
1031 | trace_nfsd_read_err(rqstp, fhp, offset, host_err); | |
dc97618d | 1032 | return nfserrno(host_err); |
87c5942e | 1033 | } |
dc97618d BF |
1034 | } |
1035 | ||
703d7521 CL |
1036 | /** |
1037 | * nfsd_splice_read - Perform a VFS read using a splice pipe | |
1038 | * @rqstp: RPC transaction context | |
1039 | * @fhp: file handle of file to be read | |
1040 | * @file: opened struct file of file to be read | |
1041 | * @offset: starting byte offset | |
1042 | * @count: IN: requested number of bytes; OUT: number of bytes read | |
1043 | * @eof: OUT: set non-zero if operation reached the end of the file | |
1044 | * | |
1045 | * Returns nfs_ok on success, otherwise an nfserr stat value is | |
1046 | * returned. | |
1047 | */ | |
87c5942e | 1048 | __be32 nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
83a63072 TM |
1049 | struct file *file, loff_t offset, unsigned long *count, |
1050 | u32 *eof) | |
dc97618d BF |
1051 | { |
1052 | struct splice_desc sd = { | |
1053 | .len = 0, | |
1054 | .total_len = *count, | |
1055 | .pos = offset, | |
1056 | .u.data = rqstp, | |
1057 | }; | |
83a63072 | 1058 | ssize_t host_err; |
dc97618d | 1059 | |
87c5942e | 1060 | trace_nfsd_read_splice(rqstp, fhp, offset, *count); |
feebea75 AG |
1061 | host_err = rw_verify_area(READ, file, &offset, *count); |
1062 | if (!host_err) | |
1063 | host_err = splice_direct_to_actor(file, &sd, | |
1064 | nfsd_direct_splice_actor); | |
83a63072 | 1065 | return nfsd_finish_read(rqstp, fhp, file, offset, count, eof, host_err); |
dc97618d BF |
1066 | } |
1067 | ||
507df40e CL |
1068 | /** |
1069 | * nfsd_iter_read - Perform a VFS read using an iterator | |
1070 | * @rqstp: RPC transaction context | |
1071 | * @fhp: file handle of file to be read | |
1072 | * @file: opened struct file of file to be read | |
1073 | * @offset: starting byte offset | |
1074 | * @count: IN: requested number of bytes; OUT: number of bytes read | |
1075 | * @base: offset in first page of read buffer | |
1076 | * @eof: OUT: set non-zero if operation reached the end of the file | |
1077 | * | |
1078 | * Some filesystems or situations cannot use nfsd_splice_read. This | |
1079 | * function is the slightly less-performant fallback for those cases. | |
1080 | * | |
1081 | * Returns nfs_ok on success, otherwise an nfserr stat value is | |
1082 | * returned. | |
1083 | */ | |
1084 | __be32 nfsd_iter_read(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
1085 | struct file *file, loff_t offset, unsigned long *count, | |
1086 | unsigned int base, u32 *eof) | |
1087 | { | |
1088 | unsigned long v, total; | |
1089 | struct iov_iter iter; | |
1090 | loff_t ppos = offset; | |
1091 | struct page *page; | |
1092 | ssize_t host_err; | |
1093 | ||
1094 | v = 0; | |
1095 | total = *count; | |
1096 | while (total) { | |
1097 | page = *(rqstp->rq_next_page++); | |
1098 | rqstp->rq_vec[v].iov_base = page_address(page) + base; | |
1099 | rqstp->rq_vec[v].iov_len = min_t(size_t, total, PAGE_SIZE - base); | |
1100 | total -= rqstp->rq_vec[v].iov_len; | |
1101 | ++v; | |
1102 | base = 0; | |
1103 | } | |
1104 | WARN_ON_ONCE(v > ARRAY_SIZE(rqstp->rq_vec)); | |
1105 | ||
1106 | trace_nfsd_read_vector(rqstp, fhp, offset, *count); | |
1107 | iov_iter_kvec(&iter, ITER_DEST, rqstp->rq_vec, v, *count); | |
1108 | host_err = vfs_iter_read(file, &iter, &ppos, 0); | |
1109 | return nfsd_finish_read(rqstp, fhp, file, offset, count, eof, host_err); | |
1110 | } | |
1111 | ||
d911df7b BF |
1112 | /* |
1113 | * Gathered writes: If another process is currently writing to the file, | |
1114 | * there's a high chance this is another nfsd (triggered by a bulk write | |
1115 | * from a client's biod). Rather than syncing the file with each write | |
1116 | * request, we sleep for 10 msec. | |
1117 | * | |
1118 | * I don't know if this roughly approximates C. Juszak's idea of | |
1119 | * gathered writes, but it's a nice and simple solution (IMHO), and it | |
1120 | * seems to work:-) | |
1121 | * | |
1122 | * Note: we do this only in the NFSv2 case, since v3 and higher have a | |
1123 | * better tool (separate unstable writes and commits) for solving this | |
1124 | * problem. | |
1125 | */ | |
1126 | static int wait_for_concurrent_writes(struct file *file) | |
1127 | { | |
496ad9aa | 1128 | struct inode *inode = file_inode(file); |
d911df7b BF |
1129 | static ino_t last_ino; |
1130 | static dev_t last_dev; | |
1131 | int err = 0; | |
1132 | ||
1133 | if (atomic_read(&inode->i_writecount) > 1 | |
1134 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
1135 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); | |
1136 | msleep(10); | |
1137 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); | |
1138 | } | |
1139 | ||
1140 | if (inode->i_state & I_DIRTY) { | |
1141 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); | |
8018ab05 | 1142 | err = vfs_fsync(file, 0); |
d911df7b BF |
1143 | } |
1144 | last_ino = inode->i_ino; | |
1145 | last_dev = inode->i_sb->s_dev; | |
1146 | return err; | |
1147 | } | |
1148 | ||
af90f707 | 1149 | __be32 |
16f8f894 | 1150 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, |
1da177e4 | 1151 | loff_t offset, struct kvec *vec, int vlen, |
19e0663f TM |
1152 | unsigned long *cnt, int stable, |
1153 | __be32 *verf) | |
1da177e4 | 1154 | { |
fb7622c2 | 1155 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
16f8f894 | 1156 | struct file *file = nf->nf_file; |
01cbf385 | 1157 | struct super_block *sb = file_inode(file)->i_sb; |
1da177e4 | 1158 | struct svc_export *exp; |
73da852e | 1159 | struct iov_iter iter; |
555dbf1a | 1160 | errseq_t since; |
d890be15 | 1161 | __be32 nfserr; |
6264d69d | 1162 | int host_err; |
48e03bc5 | 1163 | int use_wgather; |
e49dbbf3 | 1164 | loff_t pos = offset; |
01cbf385 | 1165 | unsigned long exp_op_flags = 0; |
8658452e | 1166 | unsigned int pflags = current->flags; |
ddef7ed2 | 1167 | rwf_t flags = 0; |
01cbf385 | 1168 | bool restore_flags = false; |
8658452e | 1169 | |
d890be15 CL |
1170 | trace_nfsd_write_opened(rqstp, fhp, offset, *cnt); |
1171 | ||
01cbf385 TM |
1172 | if (sb->s_export_op) |
1173 | exp_op_flags = sb->s_export_op->flags; | |
1174 | ||
1175 | if (test_bit(RQ_LOCAL, &rqstp->rq_flags) && | |
1176 | !(exp_op_flags & EXPORT_OP_REMOTE_FS)) { | |
8658452e | 1177 | /* |
a37b0715 N |
1178 | * We want throttling in balance_dirty_pages() |
1179 | * and shrink_inactive_list() to only consider | |
1180 | * the backingdev we are writing to, so that nfs to | |
8658452e N |
1181 | * localhost doesn't cause nfsd to lock up due to all |
1182 | * the client's dirty pages or its congested queue. | |
1183 | */ | |
a37b0715 | 1184 | current->flags |= PF_LOCAL_THROTTLE; |
01cbf385 TM |
1185 | restore_flags = true; |
1186 | } | |
1da177e4 | 1187 | |
865d50b2 | 1188 | exp = fhp->fh_export; |
48e03bc5 | 1189 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
1da177e4 | 1190 | |
1da177e4 | 1191 | if (!EX_ISSYNC(exp)) |
54bbb7d2 | 1192 | stable = NFS_UNSTABLE; |
1da177e4 | 1193 | |
24368aad CH |
1194 | if (stable && !use_wgather) |
1195 | flags |= RWF_SYNC; | |
1196 | ||
de4eda9d | 1197 | iov_iter_kvec(&iter, ITER_SOURCE, vec, vlen, *cnt); |
555dbf1a | 1198 | since = READ_ONCE(file->f_wb_err); |
33388b3a | 1199 | if (verf) |
3988a578 | 1200 | nfsd_copy_write_verifier(verf, nn); |
33388b3a | 1201 | host_err = vfs_iter_write(file, &iter, &pos, flags); |
7bf94c6b | 1202 | if (host_err < 0) { |
1b2021bd | 1203 | commit_reset_write_verifier(nn, rqstp, host_err); |
e4636d53 | 1204 | goto out_nfserr; |
7bf94c6b | 1205 | } |
09a80f2a | 1206 | *cnt = host_err; |
4b148854 | 1207 | nfsd_stats_io_write_add(nn, exp, *cnt); |
2a12a9d7 | 1208 | fsnotify_modify(file); |
555dbf1a TM |
1209 | host_err = filemap_check_wb_err(file->f_mapping, since); |
1210 | if (host_err < 0) | |
1211 | goto out_nfserr; | |
1da177e4 | 1212 | |
bbf2f098 | 1213 | if (stable && use_wgather) { |
24368aad | 1214 | host_err = wait_for_concurrent_writes(file); |
1b2021bd TM |
1215 | if (host_err < 0) |
1216 | commit_reset_write_verifier(nn, rqstp, host_err); | |
bbf2f098 | 1217 | } |
1da177e4 | 1218 | |
e4636d53 | 1219 | out_nfserr: |
d890be15 CL |
1220 | if (host_err >= 0) { |
1221 | trace_nfsd_write_io_done(rqstp, fhp, offset, *cnt); | |
1222 | nfserr = nfs_ok; | |
1223 | } else { | |
1224 | trace_nfsd_write_err(rqstp, fhp, offset, host_err); | |
1225 | nfserr = nfserrno(host_err); | |
1226 | } | |
01cbf385 | 1227 | if (restore_flags) |
a37b0715 | 1228 | current_restore_flags(pflags, PF_LOCAL_THROTTLE); |
d890be15 | 1229 | return nfserr; |
1da177e4 LT |
1230 | } |
1231 | ||
c21fd7a8 CL |
1232 | /** |
1233 | * nfsd_read_splice_ok - check if spliced reading is supported | |
1234 | * @rqstp: RPC transaction context | |
1235 | * | |
1236 | * Return values: | |
1237 | * %true: nfsd_splice_read() may be used | |
1238 | * %false: nfsd_splice_read() must not be used | |
1239 | * | |
1240 | * NFS READ normally uses splice to send data in-place. However the | |
1241 | * data in cache can change after the reply's MIC is computed but | |
1242 | * before the RPC reply is sent. To prevent the client from | |
1243 | * rejecting the server-computed MIC in this somewhat rare case, do | |
1244 | * not use splice with the GSS integrity and privacy services. | |
1245 | */ | |
1246 | bool nfsd_read_splice_ok(struct svc_rqst *rqstp) | |
1247 | { | |
1248 | switch (svc_auth_flavor(rqstp)) { | |
1249 | case RPC_AUTH_GSS_KRB5I: | |
1250 | case RPC_AUTH_GSS_KRB5P: | |
1251 | return false; | |
1252 | } | |
1253 | return true; | |
1254 | } | |
1255 | ||
507df40e CL |
1256 | /** |
1257 | * nfsd_read - Read data from a file | |
1258 | * @rqstp: RPC transaction context | |
1259 | * @fhp: file handle of file to be read | |
1260 | * @offset: starting byte offset | |
1261 | * @count: IN: requested number of bytes; OUT: number of bytes read | |
1262 | * @eof: OUT: set non-zero if operation reached the end of the file | |
1263 | * | |
1264 | * The caller must verify that there is enough space in @rqstp.rq_res | |
1265 | * to perform this operation. | |
1266 | * | |
dc97618d | 1267 | * N.B. After this call fhp needs an fh_put |
507df40e CL |
1268 | * |
1269 | * Returns nfs_ok on success, otherwise an nfserr stat value is | |
1270 | * returned. | |
dc97618d BF |
1271 | */ |
1272 | __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
507df40e | 1273 | loff_t offset, unsigned long *count, u32 *eof) |
dc97618d | 1274 | { |
48cd7b51 | 1275 | struct nfsd_file *nf; |
dc97618d | 1276 | struct file *file; |
dc97618d BF |
1277 | __be32 err; |
1278 | ||
f394b62b | 1279 | trace_nfsd_read_start(rqstp, fhp, offset, *count); |
4d1ea845 | 1280 | err = nfsd_file_acquire_gc(rqstp, fhp, NFSD_MAY_READ, &nf); |
dc97618d BF |
1281 | if (err) |
1282 | return err; | |
1283 | ||
48cd7b51 | 1284 | file = nf->nf_file; |
c21fd7a8 | 1285 | if (file->f_op->splice_read && nfsd_read_splice_ok(rqstp)) |
83a63072 | 1286 | err = nfsd_splice_read(rqstp, fhp, file, offset, count, eof); |
a4058c5b | 1287 | else |
507df40e | 1288 | err = nfsd_iter_read(rqstp, fhp, file, offset, count, 0, eof); |
6e8b50d1 | 1289 | |
48cd7b51 | 1290 | nfsd_file_put(nf); |
f394b62b | 1291 | trace_nfsd_read_done(rqstp, fhp, offset, *count); |
fa0a2126 BF |
1292 | return err; |
1293 | } | |
1294 | ||
1da177e4 LT |
1295 | /* |
1296 | * Write data to a file. | |
1297 | * The stable flag requests synchronous writes. | |
1298 | * N.B. After this call fhp needs an fh_put | |
1299 | */ | |
6264d69d | 1300 | __be32 |
52e380e0 | 1301 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t offset, |
19e0663f TM |
1302 | struct kvec *vec, int vlen, unsigned long *cnt, int stable, |
1303 | __be32 *verf) | |
1da177e4 | 1304 | { |
b4935239 JL |
1305 | struct nfsd_file *nf; |
1306 | __be32 err; | |
1da177e4 | 1307 | |
f394b62b | 1308 | trace_nfsd_write_start(rqstp, fhp, offset, *cnt); |
6e8b50d1 | 1309 | |
4d1ea845 | 1310 | err = nfsd_file_acquire_gc(rqstp, fhp, NFSD_MAY_WRITE, &nf); |
52e380e0 KM |
1311 | if (err) |
1312 | goto out; | |
1313 | ||
16f8f894 | 1314 | err = nfsd_vfs_write(rqstp, fhp, nf, offset, vec, |
19e0663f | 1315 | vlen, cnt, stable, verf); |
b4935239 | 1316 | nfsd_file_put(nf); |
1da177e4 | 1317 | out: |
f394b62b | 1318 | trace_nfsd_write_done(rqstp, fhp, offset, *cnt); |
1da177e4 LT |
1319 | return err; |
1320 | } | |
1321 | ||
3f965021 CL |
1322 | /** |
1323 | * nfsd_commit - Commit pending writes to stable storage | |
1324 | * @rqstp: RPC request being processed | |
1325 | * @fhp: NFS filehandle | |
c2528490 | 1326 | * @nf: target file |
3f965021 CL |
1327 | * @offset: raw offset from beginning of file |
1328 | * @count: raw count of bytes to sync | |
1329 | * @verf: filled in with the server's current write verifier | |
aa696a6f | 1330 | * |
3f965021 CL |
1331 | * Note: we guarantee that data that lies within the range specified |
1332 | * by the 'offset' and 'count' parameters will be synced. The server | |
1333 | * is permitted to sync data that lies outside this range at the | |
1334 | * same time. | |
1da177e4 LT |
1335 | * |
1336 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1337 | * data to the client, as locking happens lower down in the filesystem. | |
3f965021 CL |
1338 | * |
1339 | * Return values: | |
1340 | * An nfsstat value in network byte order. | |
1da177e4 | 1341 | */ |
6264d69d | 1342 | __be32 |
c2528490 CL |
1343 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, |
1344 | u64 offset, u32 count, __be32 *verf) | |
1da177e4 | 1345 | { |
c2528490 | 1346 | __be32 err = nfs_ok; |
3f965021 CL |
1347 | u64 maxbytes; |
1348 | loff_t start, end; | |
2c445a0e | 1349 | struct nfsd_net *nn; |
3f965021 CL |
1350 | |
1351 | /* | |
1352 | * Convert the client-provided (offset, count) range to a | |
1353 | * (start, end) range. If the client-provided range falls | |
1354 | * outside the maximum file size of the underlying FS, | |
1355 | * clamp the sync range appropriately. | |
1356 | */ | |
1357 | start = 0; | |
1358 | end = LLONG_MAX; | |
1359 | maxbytes = (u64)fhp->fh_dentry->d_sb->s_maxbytes; | |
1360 | if (offset < maxbytes) { | |
1361 | start = offset; | |
1362 | if (count && (offset + count - 1 < maxbytes)) | |
1363 | end = offset + count - 1; | |
1364 | } | |
1365 | ||
2c445a0e | 1366 | nn = net_generic(nf->nf_net, nfsd_net_id); |
1da177e4 | 1367 | if (EX_ISSYNC(fhp->fh_export)) { |
555dbf1a TM |
1368 | errseq_t since = READ_ONCE(nf->nf_file->f_wb_err); |
1369 | int err2; | |
aa696a6f | 1370 | |
3f965021 | 1371 | err2 = vfs_fsync_range(nf->nf_file, start, end, 0); |
bbf2f098 TM |
1372 | switch (err2) { |
1373 | case 0: | |
3988a578 | 1374 | nfsd_copy_write_verifier(verf, nn); |
555dbf1a TM |
1375 | err2 = filemap_check_wb_err(nf->nf_file->f_mapping, |
1376 | since); | |
8a9ffb8c | 1377 | err = nfserrno(err2); |
bbf2f098 TM |
1378 | break; |
1379 | case -EINVAL: | |
1da177e4 | 1380 | err = nfserr_notsupp; |
bbf2f098 TM |
1381 | break; |
1382 | default: | |
1b2021bd | 1383 | commit_reset_write_verifier(nn, rqstp, err2); |
8a9ffb8c | 1384 | err = nfserrno(err2); |
bbf2f098 | 1385 | } |
524ff1af | 1386 | } else |
3988a578 | 1387 | nfsd_copy_write_verifier(verf, nn); |
1da177e4 | 1388 | |
1da177e4 LT |
1389 | return err; |
1390 | } | |
1da177e4 | 1391 | |
5f46e950 CL |
1392 | /** |
1393 | * nfsd_create_setattr - Set a created file's attributes | |
1394 | * @rqstp: RPC transaction being executed | |
1395 | * @fhp: NFS filehandle of parent directory | |
1396 | * @resfhp: NFS filehandle of new object | |
7fe2a71d | 1397 | * @attrs: requested attributes of new object |
5f46e950 CL |
1398 | * |
1399 | * Returns nfs_ok on success, or an nfsstat in network byte order. | |
1400 | */ | |
1401 | __be32 | |
1402 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
7fe2a71d | 1403 | struct svc_fh *resfhp, struct nfsd_attrs *attrs) |
5c002b3b | 1404 | { |
7fe2a71d | 1405 | struct iattr *iap = attrs->na_iattr; |
5f46e950 CL |
1406 | __be32 status; |
1407 | ||
5c002b3b | 1408 | /* |
5f46e950 | 1409 | * Mode has already been set by file creation. |
5c002b3b BF |
1410 | */ |
1411 | iap->ia_valid &= ~ATTR_MODE; | |
5f46e950 | 1412 | |
5c002b3b BF |
1413 | /* |
1414 | * Setting uid/gid works only for root. Irix appears to | |
1415 | * send along the gid on create when it tries to implement | |
1416 | * setgid directories via NFS: | |
1417 | */ | |
6fab8779 | 1418 | if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) |
5c002b3b | 1419 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
5f46e950 CL |
1420 | |
1421 | /* | |
1422 | * Callers expect new file metadata to be committed even | |
1423 | * if the attributes have not changed. | |
1424 | */ | |
442d27ff | 1425 | if (nfsd_attrs_valid(attrs)) |
24d92de9 | 1426 | status = nfsd_setattr(rqstp, resfhp, attrs, NULL); |
5f46e950 CL |
1427 | else |
1428 | status = nfserrno(commit_metadata(resfhp)); | |
1429 | ||
1430 | /* | |
1431 | * Transactional filesystems had a chance to commit changes | |
1432 | * for both parent and child simultaneously making the | |
1433 | * following commit_metadata a noop in many cases. | |
1434 | */ | |
1435 | if (!status) | |
1436 | status = nfserrno(commit_metadata(fhp)); | |
1437 | ||
1438 | /* | |
1439 | * Update the new filehandle to pick up the new attributes. | |
1440 | */ | |
1441 | if (!status) | |
1442 | status = fh_update(resfhp); | |
1443 | ||
1444 | return status; | |
5c002b3b BF |
1445 | } |
1446 | ||
4ac35c2f | 1447 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
1448 | * setting size to 0 may fail for some specific file systems by the permission | |
1449 | * checking which requires WRITE permission but the mode is 000. | |
1450 | * we ignore the resizing(to 0) on the just new created file, since the size is | |
1451 | * 0 after file created. | |
1452 | * | |
1453 | * call this only after vfs_create() is called. | |
1454 | * */ | |
1455 | static void | |
1456 | nfsd_check_ignore_resizing(struct iattr *iap) | |
1457 | { | |
1458 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) | |
1459 | iap->ia_valid &= ~ATTR_SIZE; | |
1460 | } | |
1461 | ||
b44061d0 | 1462 | /* The parent directory should already be locked: */ |
6264d69d | 1463 | __be32 |
b44061d0 | 1464 | nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, |
9558f930 | 1465 | struct nfsd_attrs *attrs, |
7fe2a71d | 1466 | int type, dev_t rdev, struct svc_fh *resfhp) |
1da177e4 | 1467 | { |
2b118859 | 1468 | struct dentry *dentry, *dchild; |
1da177e4 | 1469 | struct inode *dirp; |
7fe2a71d | 1470 | struct iattr *iap = attrs->na_iattr; |
6264d69d AV |
1471 | __be32 err; |
1472 | int host_err; | |
1da177e4 | 1473 | |
1da177e4 | 1474 | dentry = fhp->fh_dentry; |
2b0143b5 | 1475 | dirp = d_inode(dentry); |
1da177e4 | 1476 | |
b44061d0 | 1477 | dchild = dget(resfhp->fh_dentry); |
7eed34f1 OD |
1478 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE); |
1479 | if (err) | |
1480 | goto out; | |
1481 | ||
1da177e4 LT |
1482 | if (!(iap->ia_valid & ATTR_MODE)) |
1483 | iap->ia_mode = 0; | |
1484 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1485 | ||
22cf8419 BF |
1486 | if (!IS_POSIXACL(dirp)) |
1487 | iap->ia_mode &= ~current_umask(); | |
1488 | ||
088406bc | 1489 | err = 0; |
1da177e4 LT |
1490 | switch (type) { |
1491 | case S_IFREG: | |
abf08576 CB |
1492 | host_err = vfs_create(&nop_mnt_idmap, dirp, dchild, |
1493 | iap->ia_mode, true); | |
4ac35c2f | 1494 | if (!host_err) |
1495 | nfsd_check_ignore_resizing(iap); | |
1da177e4 LT |
1496 | break; |
1497 | case S_IFDIR: | |
abf08576 | 1498 | host_err = vfs_mkdir(&nop_mnt_idmap, dirp, dchild, iap->ia_mode); |
3819bb0d AV |
1499 | if (!host_err && unlikely(d_unhashed(dchild))) { |
1500 | struct dentry *d; | |
1501 | d = lookup_one_len(dchild->d_name.name, | |
1502 | dchild->d_parent, | |
1503 | dchild->d_name.len); | |
1504 | if (IS_ERR(d)) { | |
1505 | host_err = PTR_ERR(d); | |
1506 | break; | |
1507 | } | |
1508 | if (unlikely(d_is_negative(d))) { | |
1509 | dput(d); | |
1510 | err = nfserr_serverfault; | |
1511 | goto out; | |
1512 | } | |
1513 | dput(resfhp->fh_dentry); | |
1514 | resfhp->fh_dentry = dget(d); | |
1515 | err = fh_update(resfhp); | |
1516 | dput(dchild); | |
1517 | dchild = d; | |
1518 | if (err) | |
1519 | goto out; | |
1520 | } | |
1da177e4 LT |
1521 | break; |
1522 | case S_IFCHR: | |
1523 | case S_IFBLK: | |
1524 | case S_IFIFO: | |
1525 | case S_IFSOCK: | |
abf08576 | 1526 | host_err = vfs_mknod(&nop_mnt_idmap, dirp, dchild, |
6521f891 | 1527 | iap->ia_mode, rdev); |
1da177e4 | 1528 | break; |
71423274 BF |
1529 | default: |
1530 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", | |
1531 | type); | |
1532 | host_err = -EINVAL; | |
1da177e4 | 1533 | } |
4a55c101 | 1534 | if (host_err < 0) |
1da177e4 LT |
1535 | goto out_nfserr; |
1536 | ||
7fe2a71d | 1537 | err = nfsd_create_setattr(rqstp, fhp, resfhp, attrs); |
1da177e4 | 1538 | |
1da177e4 | 1539 | out: |
2b118859 | 1540 | dput(dchild); |
1da177e4 LT |
1541 | return err; |
1542 | ||
1543 | out_nfserr: | |
6264d69d | 1544 | err = nfserrno(host_err); |
1da177e4 LT |
1545 | goto out; |
1546 | } | |
1547 | ||
b44061d0 BF |
1548 | /* |
1549 | * Create a filesystem object (regular, directory, special). | |
1550 | * Note that the parent directory is left locked. | |
1551 | * | |
1552 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1553 | */ | |
1554 | __be32 | |
1555 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
7fe2a71d N |
1556 | char *fname, int flen, struct nfsd_attrs *attrs, |
1557 | int type, dev_t rdev, struct svc_fh *resfhp) | |
b44061d0 BF |
1558 | { |
1559 | struct dentry *dentry, *dchild = NULL; | |
b44061d0 BF |
1560 | __be32 err; |
1561 | int host_err; | |
1562 | ||
1563 | if (isdotent(fname, flen)) | |
1564 | return nfserr_exist; | |
1565 | ||
fa08139d | 1566 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP); |
b44061d0 BF |
1567 | if (err) |
1568 | return err; | |
1569 | ||
1570 | dentry = fhp->fh_dentry; | |
b44061d0 BF |
1571 | |
1572 | host_err = fh_want_write(fhp); | |
1573 | if (host_err) | |
1574 | return nfserrno(host_err); | |
1575 | ||
debf16f0 | 1576 | inode_lock_nested(dentry->d_inode, I_MUTEX_PARENT); |
b44061d0 BF |
1577 | dchild = lookup_one_len(fname, dentry, flen); |
1578 | host_err = PTR_ERR(dchild); | |
927bfc56 N |
1579 | if (IS_ERR(dchild)) { |
1580 | err = nfserrno(host_err); | |
1581 | goto out_unlock; | |
1582 | } | |
b44061d0 | 1583 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
502aa0a5 JB |
1584 | /* |
1585 | * We unconditionally drop our ref to dchild as fh_compose will have | |
1586 | * already grabbed its own ref for it. | |
1587 | */ | |
1588 | dput(dchild); | |
1589 | if (err) | |
927bfc56 | 1590 | goto out_unlock; |
a332018a JL |
1591 | err = fh_fill_pre_attrs(fhp); |
1592 | if (err != nfs_ok) | |
1593 | goto out_unlock; | |
9558f930 | 1594 | err = nfsd_create_locked(rqstp, fhp, attrs, type, rdev, resfhp); |
debf16f0 | 1595 | fh_fill_post_attrs(fhp); |
927bfc56 | 1596 | out_unlock: |
debf16f0 | 1597 | inode_unlock(dentry->d_inode); |
927bfc56 | 1598 | return err; |
b44061d0 BF |
1599 | } |
1600 | ||
1da177e4 LT |
1601 | /* |
1602 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1603 | * fits into the buffer. On return, it contains the true length. | |
1604 | * N.B. After this call fhp needs an fh_put | |
1605 | */ | |
6264d69d | 1606 | __be32 |
1da177e4 LT |
1607 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1608 | { | |
6264d69d | 1609 | __be32 err; |
4d7edbc3 | 1610 | const char *link; |
68ac1234 | 1611 | struct path path; |
4d7edbc3 AV |
1612 | DEFINE_DELAYED_CALL(done); |
1613 | int len; | |
1da177e4 | 1614 | |
8837abca | 1615 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
4d7edbc3 AV |
1616 | if (unlikely(err)) |
1617 | return err; | |
1da177e4 | 1618 | |
68ac1234 AV |
1619 | path.mnt = fhp->fh_export->ex_path.mnt; |
1620 | path.dentry = fhp->fh_dentry; | |
1da177e4 | 1621 | |
4d7edbc3 AV |
1622 | if (unlikely(!d_is_symlink(path.dentry))) |
1623 | return nfserr_inval; | |
1da177e4 | 1624 | |
68ac1234 | 1625 | touch_atime(&path); |
1da177e4 | 1626 | |
4d7edbc3 AV |
1627 | link = vfs_get_link(path.dentry, &done); |
1628 | if (IS_ERR(link)) | |
1629 | return nfserrno(PTR_ERR(link)); | |
1da177e4 | 1630 | |
4d7edbc3 AV |
1631 | len = strlen(link); |
1632 | if (len < *lenp) | |
1633 | *lenp = len; | |
1634 | memcpy(buf, link, *lenp); | |
1635 | do_delayed_call(&done); | |
1636 | return 0; | |
1da177e4 LT |
1637 | } |
1638 | ||
93adc1e3 N |
1639 | /** |
1640 | * nfsd_symlink - Create a symlink and look up its inode | |
1641 | * @rqstp: RPC transaction being executed | |
1642 | * @fhp: NFS filehandle of parent directory | |
1643 | * @fname: filename of the new symlink | |
1644 | * @flen: length of @fname | |
1645 | * @path: content of the new symlink (NUL-terminated) | |
1646 | * @attrs: requested attributes of new object | |
1647 | * @resfhp: NFS filehandle of new object | |
1648 | * | |
1da177e4 | 1649 | * N.B. After this call _both_ fhp and resfhp need an fh_put |
93adc1e3 N |
1650 | * |
1651 | * Returns nfs_ok on success, or an nfsstat in network byte order. | |
1da177e4 | 1652 | */ |
6264d69d | 1653 | __be32 |
1da177e4 | 1654 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
93adc1e3 N |
1655 | char *fname, int flen, |
1656 | char *path, struct nfsd_attrs *attrs, | |
1657 | struct svc_fh *resfhp) | |
1da177e4 LT |
1658 | { |
1659 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1660 | __be32 err, cerr; |
1661 | int host_err; | |
1da177e4 LT |
1662 | |
1663 | err = nfserr_noent; | |
52ee0433 | 1664 | if (!flen || path[0] == '\0') |
1da177e4 LT |
1665 | goto out; |
1666 | err = nfserr_exist; | |
1667 | if (isdotent(fname, flen)) | |
1668 | goto out; | |
1669 | ||
8837abca | 1670 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1671 | if (err) |
1672 | goto out; | |
4a55c101 JK |
1673 | |
1674 | host_err = fh_want_write(fhp); | |
927bfc56 N |
1675 | if (host_err) { |
1676 | err = nfserrno(host_err); | |
1677 | goto out; | |
1678 | } | |
4a55c101 | 1679 | |
1da177e4 | 1680 | dentry = fhp->fh_dentry; |
debf16f0 | 1681 | inode_lock_nested(dentry->d_inode, I_MUTEX_PARENT); |
1da177e4 | 1682 | dnew = lookup_one_len(fname, dentry, flen); |
927bfc56 N |
1683 | if (IS_ERR(dnew)) { |
1684 | err = nfserrno(PTR_ERR(dnew)); | |
debf16f0 | 1685 | inode_unlock(dentry->d_inode); |
927bfc56 N |
1686 | goto out_drop_write; |
1687 | } | |
a332018a JL |
1688 | err = fh_fill_pre_attrs(fhp); |
1689 | if (err != nfs_ok) | |
1690 | goto out_unlock; | |
abf08576 | 1691 | host_err = vfs_symlink(&nop_mnt_idmap, d_inode(dentry), dnew, path); |
6264d69d | 1692 | err = nfserrno(host_err); |
93adc1e3 N |
1693 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
1694 | if (!err) | |
1695 | nfsd_create_setattr(rqstp, fhp, resfhp, attrs); | |
debf16f0 | 1696 | fh_fill_post_attrs(fhp); |
a332018a | 1697 | out_unlock: |
debf16f0 | 1698 | inode_unlock(dentry->d_inode); |
f501912a BM |
1699 | if (!err) |
1700 | err = nfserrno(commit_metadata(fhp)); | |
1da177e4 LT |
1701 | dput(dnew); |
1702 | if (err==0) err = cerr; | |
927bfc56 N |
1703 | out_drop_write: |
1704 | fh_drop_write(fhp); | |
1da177e4 LT |
1705 | out: |
1706 | return err; | |
1da177e4 LT |
1707 | } |
1708 | ||
1709 | /* | |
1710 | * Create a hardlink | |
1711 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1712 | */ | |
6264d69d | 1713 | __be32 |
1da177e4 LT |
1714 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1715 | char *name, int len, struct svc_fh *tfhp) | |
1716 | { | |
1717 | struct dentry *ddir, *dnew, *dold; | |
55b13354 | 1718 | struct inode *dirp; |
6264d69d AV |
1719 | __be32 err; |
1720 | int host_err; | |
1da177e4 | 1721 | |
8837abca | 1722 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1723 | if (err) |
1724 | goto out; | |
7d818a7b | 1725 | err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
1726 | if (err) |
1727 | goto out; | |
7d818a7b | 1728 | err = nfserr_isdir; |
e36cb0b8 | 1729 | if (d_is_dir(tfhp->fh_dentry)) |
7d818a7b | 1730 | goto out; |
1da177e4 LT |
1731 | err = nfserr_perm; |
1732 | if (!len) | |
1733 | goto out; | |
1734 | err = nfserr_exist; | |
1735 | if (isdotent(name, len)) | |
1736 | goto out; | |
1737 | ||
4a55c101 JK |
1738 | host_err = fh_want_write(tfhp); |
1739 | if (host_err) { | |
1740 | err = nfserrno(host_err); | |
1741 | goto out; | |
1742 | } | |
1743 | ||
1da177e4 | 1744 | ddir = ffhp->fh_dentry; |
2b0143b5 | 1745 | dirp = d_inode(ddir); |
debf16f0 | 1746 | inode_lock_nested(dirp, I_MUTEX_PARENT); |
1da177e4 LT |
1747 | |
1748 | dnew = lookup_one_len(name, ddir, len); | |
e18bcb33 N |
1749 | if (IS_ERR(dnew)) { |
1750 | err = nfserrno(PTR_ERR(dnew)); | |
1751 | goto out_unlock; | |
1752 | } | |
1da177e4 LT |
1753 | |
1754 | dold = tfhp->fh_dentry; | |
1da177e4 | 1755 | |
4795bb37 | 1756 | err = nfserr_noent; |
2b0143b5 | 1757 | if (d_really_is_negative(dold)) |
4a55c101 | 1758 | goto out_dput; |
a332018a JL |
1759 | err = fh_fill_pre_attrs(ffhp); |
1760 | if (err != nfs_ok) | |
1761 | goto out_dput; | |
abf08576 | 1762 | host_err = vfs_link(dold, &nop_mnt_idmap, dirp, dnew, NULL); |
debf16f0 N |
1763 | fh_fill_post_attrs(ffhp); |
1764 | inode_unlock(dirp); | |
6264d69d | 1765 | if (!host_err) { |
f501912a BM |
1766 | err = nfserrno(commit_metadata(ffhp)); |
1767 | if (!err) | |
1768 | err = nfserrno(commit_metadata(tfhp)); | |
1da177e4 | 1769 | } else { |
6264d69d | 1770 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1771 | err = nfserr_acces; |
1772 | else | |
6264d69d | 1773 | err = nfserrno(host_err); |
1da177e4 | 1774 | } |
1da177e4 | 1775 | dput(dnew); |
e18bcb33 | 1776 | out_drop_write: |
4a55c101 | 1777 | fh_drop_write(tfhp); |
1da177e4 LT |
1778 | out: |
1779 | return err; | |
1780 | ||
e18bcb33 N |
1781 | out_dput: |
1782 | dput(dnew); | |
1783 | out_unlock: | |
debf16f0 | 1784 | inode_unlock(dirp); |
e18bcb33 | 1785 | goto out_drop_write; |
1da177e4 LT |
1786 | } |
1787 | ||
7775ec57 JL |
1788 | static void |
1789 | nfsd_close_cached_files(struct dentry *dentry) | |
1790 | { | |
1791 | struct inode *inode = d_inode(dentry); | |
1792 | ||
1793 | if (inode && S_ISREG(inode->i_mode)) | |
1794 | nfsd_file_close_inode_sync(inode); | |
1795 | } | |
1796 | ||
1797 | static bool | |
1798 | nfsd_has_cached_files(struct dentry *dentry) | |
1799 | { | |
1800 | bool ret = false; | |
1801 | struct inode *inode = d_inode(dentry); | |
1802 | ||
1803 | if (inode && S_ISREG(inode->i_mode)) | |
1804 | ret = nfsd_file_is_cached(inode); | |
1805 | return ret; | |
1806 | } | |
1807 | ||
1da177e4 LT |
1808 | /* |
1809 | * Rename a file | |
1810 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1811 | */ | |
6264d69d | 1812 | __be32 |
1da177e4 LT |
1813 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1814 | struct svc_fh *tfhp, char *tname, int tlen) | |
1815 | { | |
1816 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1817 | struct inode *fdir, *tdir; | |
6264d69d AV |
1818 | __be32 err; |
1819 | int host_err; | |
7f84b488 | 1820 | bool close_cached = false; |
1da177e4 | 1821 | |
8837abca | 1822 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1823 | if (err) |
1824 | goto out; | |
8837abca | 1825 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1826 | if (err) |
1827 | goto out; | |
1828 | ||
1829 | fdentry = ffhp->fh_dentry; | |
2b0143b5 | 1830 | fdir = d_inode(fdentry); |
1da177e4 LT |
1831 | |
1832 | tdentry = tfhp->fh_dentry; | |
2b0143b5 | 1833 | tdir = d_inode(tdentry); |
1da177e4 | 1834 | |
1da177e4 LT |
1835 | err = nfserr_perm; |
1836 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1837 | goto out; | |
1838 | ||
1aee9158 AV |
1839 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; |
1840 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) | |
1841 | goto out; | |
1842 | if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) | |
1843 | goto out; | |
1844 | ||
7775ec57 | 1845 | retry: |
4a55c101 JK |
1846 | host_err = fh_want_write(ffhp); |
1847 | if (host_err) { | |
1848 | err = nfserrno(host_err); | |
1849 | goto out; | |
1850 | } | |
1851 | ||
1da177e4 | 1852 | trap = lock_rename(tdentry, fdentry); |
a8b00268 AV |
1853 | if (IS_ERR(trap)) { |
1854 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; | |
9fe6e9e7 | 1855 | goto out_want_write; |
a8b00268 | 1856 | } |
a332018a JL |
1857 | err = fh_fill_pre_attrs(ffhp); |
1858 | if (err != nfs_ok) | |
1859 | goto out_unlock; | |
1860 | err = fh_fill_pre_attrs(tfhp); | |
1861 | if (err != nfs_ok) | |
1862 | goto out_unlock; | |
1da177e4 LT |
1863 | |
1864 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1865 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1866 | if (IS_ERR(odentry)) |
1867 | goto out_nfserr; | |
1868 | ||
6264d69d | 1869 | host_err = -ENOENT; |
2b0143b5 | 1870 | if (d_really_is_negative(odentry)) |
1da177e4 | 1871 | goto out_dput_old; |
6264d69d | 1872 | host_err = -EINVAL; |
1da177e4 LT |
1873 | if (odentry == trap) |
1874 | goto out_dput_old; | |
1875 | ||
1876 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1877 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1878 | if (IS_ERR(ndentry)) |
1879 | goto out_dput_old; | |
6264d69d | 1880 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1881 | if (ndentry == trap) |
1882 | goto out_dput_new; | |
1883 | ||
7f84b488 JL |
1884 | if ((ndentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK) && |
1885 | nfsd_has_cached_files(ndentry)) { | |
1886 | close_cached = true; | |
7775ec57 JL |
1887 | goto out_dput_old; |
1888 | } else { | |
9fe61450 | 1889 | struct renamedata rd = { |
abf08576 | 1890 | .old_mnt_idmap = &nop_mnt_idmap, |
9fe61450 CB |
1891 | .old_dir = fdir, |
1892 | .old_dentry = odentry, | |
abf08576 | 1893 | .new_mnt_idmap = &nop_mnt_idmap, |
9fe61450 CB |
1894 | .new_dir = tdir, |
1895 | .new_dentry = ndentry, | |
1896 | }; | |
68c522af CL |
1897 | int retries; |
1898 | ||
1899 | for (retries = 1;;) { | |
1900 | host_err = vfs_rename(&rd); | |
1901 | if (host_err != -EAGAIN || !retries--) | |
1902 | break; | |
1903 | if (!nfsd_wait_for_delegreturn(rqstp, d_inode(odentry))) | |
1904 | break; | |
1905 | } | |
7775ec57 JL |
1906 | if (!host_err) { |
1907 | host_err = commit_metadata(tfhp); | |
1908 | if (!host_err) | |
1909 | host_err = commit_metadata(ffhp); | |
1910 | } | |
1da177e4 | 1911 | } |
1da177e4 LT |
1912 | out_dput_new: |
1913 | dput(ndentry); | |
1914 | out_dput_old: | |
1915 | dput(odentry); | |
1916 | out_nfserr: | |
6264d69d | 1917 | err = nfserrno(host_err); |
dd8dd403 | 1918 | |
7f84b488 | 1919 | if (!close_cached) { |
fcb5e3fa CL |
1920 | fh_fill_post_attrs(ffhp); |
1921 | fh_fill_post_attrs(tfhp); | |
7775ec57 | 1922 | } |
a332018a | 1923 | out_unlock: |
1da177e4 | 1924 | unlock_rename(tdentry, fdentry); |
9fe6e9e7 | 1925 | out_want_write: |
4a55c101 | 1926 | fh_drop_write(ffhp); |
1da177e4 | 1927 | |
7775ec57 | 1928 | /* |
5ff318f6 N |
1929 | * If the target dentry has cached open files, then we need to |
1930 | * try to close them prior to doing the rename. Final fput | |
1931 | * shouldn't be done with locks held however, so we delay it | |
1932 | * until this point and then reattempt the whole shebang. | |
7775ec57 | 1933 | */ |
7f84b488 JL |
1934 | if (close_cached) { |
1935 | close_cached = false; | |
7775ec57 JL |
1936 | nfsd_close_cached_files(ndentry); |
1937 | dput(ndentry); | |
1938 | goto retry; | |
1939 | } | |
1da177e4 LT |
1940 | out: |
1941 | return err; | |
1942 | } | |
1943 | ||
1944 | /* | |
1945 | * Unlink a file or directory | |
1946 | * N.B. After this call fhp needs an fh_put | |
1947 | */ | |
6264d69d | 1948 | __be32 |
1da177e4 LT |
1949 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1950 | char *fname, int flen) | |
1951 | { | |
1952 | struct dentry *dentry, *rdentry; | |
1953 | struct inode *dirp; | |
e5d74a2d | 1954 | struct inode *rinode; |
6264d69d AV |
1955 | __be32 err; |
1956 | int host_err; | |
1da177e4 LT |
1957 | |
1958 | err = nfserr_acces; | |
1959 | if (!flen || isdotent(fname, flen)) | |
1960 | goto out; | |
8837abca | 1961 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1962 | if (err) |
1963 | goto out; | |
1964 | ||
4a55c101 JK |
1965 | host_err = fh_want_write(fhp); |
1966 | if (host_err) | |
1967 | goto out_nfserr; | |
1968 | ||
1da177e4 | 1969 | dentry = fhp->fh_dentry; |
2b0143b5 | 1970 | dirp = d_inode(dentry); |
debf16f0 | 1971 | inode_lock_nested(dirp, I_MUTEX_PARENT); |
1da177e4 LT |
1972 | |
1973 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1974 | host_err = PTR_ERR(rdentry); |
1da177e4 | 1975 | if (IS_ERR(rdentry)) |
b677c0c6 | 1976 | goto out_unlock; |
1da177e4 | 1977 | |
2b0143b5 | 1978 | if (d_really_is_negative(rdentry)) { |
1da177e4 | 1979 | dput(rdentry); |
0ca0c9d7 | 1980 | host_err = -ENOENT; |
b677c0c6 | 1981 | goto out_unlock; |
1da177e4 | 1982 | } |
e5d74a2d | 1983 | rinode = d_inode(rdentry); |
a332018a JL |
1984 | err = fh_fill_pre_attrs(fhp); |
1985 | if (err != nfs_ok) | |
1986 | goto out_unlock; | |
1da177e4 | 1987 | |
a332018a | 1988 | ihold(rinode); |
1da177e4 | 1989 | if (!type) |
2b0143b5 | 1990 | type = d_inode(rdentry)->i_mode & S_IFMT; |
1da177e4 | 1991 | |
7775ec57 | 1992 | if (type != S_IFDIR) { |
5f5f8b6d CL |
1993 | int retries; |
1994 | ||
7f84b488 JL |
1995 | if (rdentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK) |
1996 | nfsd_close_cached_files(rdentry); | |
5f5f8b6d CL |
1997 | |
1998 | for (retries = 1;;) { | |
abf08576 | 1999 | host_err = vfs_unlink(&nop_mnt_idmap, dirp, rdentry, NULL); |
5f5f8b6d CL |
2000 | if (host_err != -EAGAIN || !retries--) |
2001 | break; | |
2002 | if (!nfsd_wait_for_delegreturn(rqstp, rinode)) | |
2003 | break; | |
2004 | } | |
7775ec57 | 2005 | } else { |
abf08576 | 2006 | host_err = vfs_rmdir(&nop_mnt_idmap, dirp, rdentry); |
7775ec57 | 2007 | } |
debf16f0 | 2008 | fh_fill_post_attrs(fhp); |
7775ec57 | 2009 | |
debf16f0 | 2010 | inode_unlock(dirp); |
f501912a BM |
2011 | if (!host_err) |
2012 | host_err = commit_metadata(fhp); | |
541ce98c | 2013 | dput(rdentry); |
e5d74a2d | 2014 | iput(rinode); /* truncate the inode here */ |
541ce98c | 2015 | |
0ca0c9d7 BF |
2016 | out_drop_write: |
2017 | fh_drop_write(fhp); | |
1da177e4 | 2018 | out_nfserr: |
466e16f0 N |
2019 | if (host_err == -EBUSY) { |
2020 | /* name is mounted-on. There is no perfect | |
2021 | * error status. | |
2022 | */ | |
2023 | if (nfsd_v4client(rqstp)) | |
2024 | err = nfserr_file_open; | |
2025 | else | |
2026 | err = nfserr_acces; | |
2027 | } else { | |
2028 | err = nfserrno(host_err); | |
2029 | } | |
f193fbab YT |
2030 | out: |
2031 | return err; | |
b677c0c6 | 2032 | out_unlock: |
debf16f0 | 2033 | inode_unlock(dirp); |
b677c0c6 | 2034 | goto out_drop_write; |
1da177e4 LT |
2035 | } |
2036 | ||
14f7dd63 DW |
2037 | /* |
2038 | * We do this buffering because we must not call back into the file | |
2039 | * system's ->lookup() method from the filldir callback. That may well | |
2040 | * deadlock a number of file systems. | |
2041 | * | |
2042 | * This is based heavily on the implementation of same in XFS. | |
2043 | */ | |
2044 | struct buffered_dirent { | |
2045 | u64 ino; | |
2046 | loff_t offset; | |
2047 | int namlen; | |
2048 | unsigned int d_type; | |
2049 | char name[]; | |
2050 | }; | |
2051 | ||
2052 | struct readdir_data { | |
5c0ba4e0 | 2053 | struct dir_context ctx; |
14f7dd63 DW |
2054 | char *dirent; |
2055 | size_t used; | |
53c9c5c0 | 2056 | int full; |
14f7dd63 DW |
2057 | }; |
2058 | ||
25885a35 | 2059 | static bool nfsd_buffered_filldir(struct dir_context *ctx, const char *name, |
ac7576f4 MS |
2060 | int namlen, loff_t offset, u64 ino, |
2061 | unsigned int d_type) | |
14f7dd63 | 2062 | { |
ac7576f4 MS |
2063 | struct readdir_data *buf = |
2064 | container_of(ctx, struct readdir_data, ctx); | |
14f7dd63 DW |
2065 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); |
2066 | unsigned int reclen; | |
2067 | ||
2068 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); | |
53c9c5c0 AV |
2069 | if (buf->used + reclen > PAGE_SIZE) { |
2070 | buf->full = 1; | |
25885a35 | 2071 | return false; |
53c9c5c0 | 2072 | } |
14f7dd63 DW |
2073 | |
2074 | de->namlen = namlen; | |
2075 | de->offset = offset; | |
2076 | de->ino = ino; | |
2077 | de->d_type = d_type; | |
2078 | memcpy(de->name, name, namlen); | |
2079 | buf->used += reclen; | |
2080 | ||
25885a35 | 2081 | return true; |
14f7dd63 DW |
2082 | } |
2083 | ||
6019ce07 CL |
2084 | static __be32 nfsd_buffered_readdir(struct file *file, struct svc_fh *fhp, |
2085 | nfsd_filldir_t func, struct readdir_cd *cdp, | |
2086 | loff_t *offsetp) | |
2628b766 | 2087 | { |
14f7dd63 | 2088 | struct buffered_dirent *de; |
2628b766 | 2089 | int host_err; |
14f7dd63 DW |
2090 | int size; |
2091 | loff_t offset; | |
ac6614b7 AV |
2092 | struct readdir_data buf = { |
2093 | .ctx.actor = nfsd_buffered_filldir, | |
2094 | .dirent = (void *)__get_free_page(GFP_KERNEL) | |
2095 | }; | |
2628b766 | 2096 | |
14f7dd63 | 2097 | if (!buf.dirent) |
2f9092e1 | 2098 | return nfserrno(-ENOMEM); |
14f7dd63 DW |
2099 | |
2100 | offset = *offsetp; | |
2628b766 | 2101 | |
14f7dd63 DW |
2102 | while (1) { |
2103 | unsigned int reclen; | |
2104 | ||
b726e923 | 2105 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
14f7dd63 | 2106 | buf.used = 0; |
53c9c5c0 | 2107 | buf.full = 0; |
14f7dd63 | 2108 | |
5c0ba4e0 | 2109 | host_err = iterate_dir(file, &buf.ctx); |
53c9c5c0 AV |
2110 | if (buf.full) |
2111 | host_err = 0; | |
2112 | ||
2113 | if (host_err < 0) | |
14f7dd63 DW |
2114 | break; |
2115 | ||
2116 | size = buf.used; | |
2117 | ||
2118 | if (!size) | |
2119 | break; | |
2120 | ||
14f7dd63 DW |
2121 | de = (struct buffered_dirent *)buf.dirent; |
2122 | while (size > 0) { | |
2123 | offset = de->offset; | |
2124 | ||
2125 | if (func(cdp, de->name, de->namlen, de->offset, | |
2126 | de->ino, de->d_type)) | |
2f9092e1 | 2127 | break; |
14f7dd63 DW |
2128 | |
2129 | if (cdp->err != nfs_ok) | |
2f9092e1 | 2130 | break; |
14f7dd63 | 2131 | |
6019ce07 CL |
2132 | trace_nfsd_dirent(fhp, de->ino, de->name, de->namlen); |
2133 | ||
14f7dd63 DW |
2134 | reclen = ALIGN(sizeof(*de) + de->namlen, |
2135 | sizeof(u64)); | |
2136 | size -= reclen; | |
2137 | de = (struct buffered_dirent *)((char *)de + reclen); | |
2138 | } | |
2f9092e1 DW |
2139 | if (size > 0) /* We bailed out early */ |
2140 | break; | |
2141 | ||
c002a6c7 | 2142 | offset = vfs_llseek(file, 0, SEEK_CUR); |
14f7dd63 DW |
2143 | } |
2144 | ||
14f7dd63 | 2145 | free_page((unsigned long)(buf.dirent)); |
2628b766 DW |
2146 | |
2147 | if (host_err) | |
2148 | return nfserrno(host_err); | |
14f7dd63 DW |
2149 | |
2150 | *offsetp = offset; | |
2151 | return cdp->err; | |
2628b766 DW |
2152 | } |
2153 | ||
a853ed55 CL |
2154 | /** |
2155 | * nfsd_readdir - Read entries from a directory | |
2156 | * @rqstp: RPC transaction context | |
2157 | * @fhp: NFS file handle of directory to be read | |
2158 | * @offsetp: OUT: seek offset of final entry that was read | |
2159 | * @cdp: OUT: an eof error value | |
2160 | * @func: entry filler actor | |
2161 | * | |
2162 | * This implementation ignores the NFSv3/4 verifier cookie. | |
2163 | * | |
2164 | * NB: normal system calls hold file->f_pos_lock when calling | |
2165 | * ->iterate_shared and ->llseek, but nfsd_readdir() does not. | |
2166 | * Because the struct file acquired here is not visible to other | |
2167 | * threads, it's internal state does not need mutex protection. | |
2168 | * | |
2169 | * Returns nfs_ok on success, otherwise an nfsstat code is | |
2170 | * returned. | |
1da177e4 | 2171 | */ |
6264d69d | 2172 | __be32 |
1da177e4 | 2173 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
ac7576f4 | 2174 | struct readdir_cd *cdp, nfsd_filldir_t func) |
1da177e4 | 2175 | { |
6264d69d | 2176 | __be32 err; |
1da177e4 LT |
2177 | struct file *file; |
2178 | loff_t offset = *offsetp; | |
06effdbb BS |
2179 | int may_flags = NFSD_MAY_READ; |
2180 | ||
2181 | /* NFSv2 only supports 32 bit cookies */ | |
2182 | if (rqstp->rq_vers > 2) | |
2183 | may_flags |= NFSD_MAY_64BIT_COOKIE; | |
1da177e4 | 2184 | |
06effdbb | 2185 | err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); |
1da177e4 LT |
2186 | if (err) |
2187 | goto out; | |
2188 | ||
b108fe6b | 2189 | offset = vfs_llseek(file, offset, SEEK_SET); |
1da177e4 LT |
2190 | if (offset < 0) { |
2191 | err = nfserrno((int)offset); | |
2192 | goto out_close; | |
2193 | } | |
2194 | ||
6019ce07 | 2195 | err = nfsd_buffered_readdir(file, fhp, func, cdp, offsetp); |
1da177e4 LT |
2196 | |
2197 | if (err == nfserr_eof || err == nfserr_toosmall) | |
2198 | err = nfs_ok; /* can still be found in ->err */ | |
2199 | out_close: | |
5ff318f6 | 2200 | nfsd_filp_close(file); |
1da177e4 LT |
2201 | out: |
2202 | return err; | |
2203 | } | |
2204 | ||
5ff318f6 N |
2205 | /** |
2206 | * nfsd_filp_close: close a file synchronously | |
2207 | * @fp: the file to close | |
2208 | * | |
2209 | * nfsd_filp_close() is similar in behaviour to filp_close(). | |
2210 | * The difference is that if this is the final close on the | |
2211 | * file, the that finalisation happens immediately, rather then | |
2212 | * being handed over to a work_queue, as it the case for | |
2213 | * filp_close(). | |
2214 | * When a user-space process closes a file (even when using | |
2215 | * filp_close() the finalisation happens before returning to | |
2216 | * userspace, so it is effectively synchronous. When a kernel thread | |
2217 | * uses file_close(), on the other hand, the handling is completely | |
2218 | * asynchronous. This means that any cost imposed by that finalisation | |
2219 | * is not imposed on the nfsd thread, and nfsd could potentually | |
2220 | * close files more quickly than the work queue finalises the close, | |
2221 | * which would lead to unbounded growth in the queue. | |
2222 | * | |
2223 | * In some contexts is it not safe to synchronously wait for | |
2224 | * close finalisation (see comment for __fput_sync()), but nfsd | |
2225 | * does not match those contexts. In partcilarly it does not, at the | |
2226 | * time that this function is called, hold and locks and no finalisation | |
2227 | * of any file, socket, or device driver would have any cause to wait | |
2228 | * for nfsd to make progress. | |
2229 | */ | |
2230 | void nfsd_filp_close(struct file *fp) | |
2231 | { | |
2232 | get_file(fp); | |
2233 | filp_close(fp, NULL); | |
2234 | __fput_sync(fp); | |
2235 | } | |
2236 | ||
1da177e4 LT |
2237 | /* |
2238 | * Get file system stats | |
2239 | * N.B. After this call fhp needs an fh_put | |
2240 | */ | |
6264d69d | 2241 | __be32 |
04716e66 | 2242 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) |
1da177e4 | 2243 | { |
ebabe9a9 CH |
2244 | __be32 err; |
2245 | ||
2246 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); | |
f6360efb TI |
2247 | if (!err) { |
2248 | struct path path = { | |
2249 | .mnt = fhp->fh_export->ex_path.mnt, | |
2250 | .dentry = fhp->fh_dentry, | |
2251 | }; | |
2252 | if (vfs_statfs(&path, stat)) | |
2253 | err = nfserr_io; | |
2254 | } | |
1da177e4 LT |
2255 | return err; |
2256 | } | |
2257 | ||
c7d51402 | 2258 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
e22841c6 | 2259 | { |
c7d51402 | 2260 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
e22841c6 BF |
2261 | } |
2262 | ||
32119446 FL |
2263 | #ifdef CONFIG_NFSD_V4 |
2264 | /* | |
2265 | * Helper function to translate error numbers. In the case of xattr operations, | |
2266 | * some error codes need to be translated outside of the standard translations. | |
2267 | * | |
2268 | * ENODATA needs to be translated to nfserr_noxattr. | |
2269 | * E2BIG to nfserr_xattr2big. | |
2270 | * | |
2271 | * Additionally, vfs_listxattr can return -ERANGE. This means that the | |
2272 | * file has too many extended attributes to retrieve inside an | |
2273 | * XATTR_LIST_MAX sized buffer. This is a bug in the xattr implementation: | |
2274 | * filesystems will allow the adding of extended attributes until they hit | |
2275 | * their own internal limit. This limit may be larger than XATTR_LIST_MAX. | |
2276 | * So, at that point, the attributes are present and valid, but can't | |
2277 | * be retrieved using listxattr, since the upper level xattr code enforces | |
2278 | * the XATTR_LIST_MAX limit. | |
2279 | * | |
2280 | * This bug means that we need to deal with listxattr returning -ERANGE. The | |
2281 | * best mapping is to return TOOSMALL. | |
2282 | */ | |
2283 | static __be32 | |
2284 | nfsd_xattr_errno(int err) | |
2285 | { | |
2286 | switch (err) { | |
2287 | case -ENODATA: | |
2288 | return nfserr_noxattr; | |
2289 | case -E2BIG: | |
2290 | return nfserr_xattr2big; | |
2291 | case -ERANGE: | |
2292 | return nfserr_toosmall; | |
2293 | } | |
2294 | return nfserrno(err); | |
2295 | } | |
2296 | ||
2297 | /* | |
2298 | * Retrieve the specified user extended attribute. To avoid always | |
2299 | * having to allocate the maximum size (since we are not getting | |
2300 | * a maximum size from the RPC), do a probe + alloc. Hold a reader | |
2301 | * lock on i_rwsem to prevent the extended attribute from changing | |
2302 | * size while we're doing this. | |
2303 | */ | |
2304 | __be32 | |
2305 | nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name, | |
2306 | void **bufp, int *lenp) | |
2307 | { | |
2308 | ssize_t len; | |
2309 | __be32 err; | |
2310 | char *buf; | |
2311 | struct inode *inode; | |
2312 | struct dentry *dentry; | |
2313 | ||
2314 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_READ); | |
2315 | if (err) | |
2316 | return err; | |
2317 | ||
2318 | err = nfs_ok; | |
2319 | dentry = fhp->fh_dentry; | |
2320 | inode = d_inode(dentry); | |
2321 | ||
2322 | inode_lock_shared(inode); | |
2323 | ||
4609e1f1 | 2324 | len = vfs_getxattr(&nop_mnt_idmap, dentry, name, NULL, 0); |
32119446 FL |
2325 | |
2326 | /* | |
2327 | * Zero-length attribute, just return. | |
2328 | */ | |
2329 | if (len == 0) { | |
2330 | *bufp = NULL; | |
2331 | *lenp = 0; | |
2332 | goto out; | |
2333 | } | |
2334 | ||
2335 | if (len < 0) { | |
2336 | err = nfsd_xattr_errno(len); | |
2337 | goto out; | |
2338 | } | |
2339 | ||
2340 | if (len > *lenp) { | |
2341 | err = nfserr_toosmall; | |
2342 | goto out; | |
2343 | } | |
2344 | ||
22b620ec | 2345 | buf = kvmalloc(len, GFP_KERNEL); |
32119446 FL |
2346 | if (buf == NULL) { |
2347 | err = nfserr_jukebox; | |
2348 | goto out; | |
2349 | } | |
2350 | ||
4609e1f1 | 2351 | len = vfs_getxattr(&nop_mnt_idmap, dentry, name, buf, len); |
32119446 FL |
2352 | if (len <= 0) { |
2353 | kvfree(buf); | |
2354 | buf = NULL; | |
2355 | err = nfsd_xattr_errno(len); | |
2356 | } | |
2357 | ||
2358 | *lenp = len; | |
2359 | *bufp = buf; | |
2360 | ||
2361 | out: | |
2362 | inode_unlock_shared(inode); | |
2363 | ||
2364 | return err; | |
2365 | } | |
2366 | ||
2367 | /* | |
2368 | * Retrieve the xattr names. Since we can't know how many are | |
2369 | * user extended attributes, we must get all attributes here, | |
2370 | * and have the XDR encode filter out the "user." ones. | |
2371 | * | |
2372 | * While this could always just allocate an XATTR_LIST_MAX | |
2373 | * buffer, that's a waste, so do a probe + allocate. To | |
2374 | * avoid any changes between the probe and allocate, wrap | |
2375 | * this in inode_lock. | |
2376 | */ | |
2377 | __be32 | |
2378 | nfsd_listxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char **bufp, | |
2379 | int *lenp) | |
2380 | { | |
2381 | ssize_t len; | |
2382 | __be32 err; | |
2383 | char *buf; | |
2384 | struct inode *inode; | |
2385 | struct dentry *dentry; | |
2386 | ||
2387 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_READ); | |
2388 | if (err) | |
2389 | return err; | |
2390 | ||
2391 | dentry = fhp->fh_dentry; | |
2392 | inode = d_inode(dentry); | |
2393 | *lenp = 0; | |
2394 | ||
2395 | inode_lock_shared(inode); | |
2396 | ||
2397 | len = vfs_listxattr(dentry, NULL, 0); | |
2398 | if (len <= 0) { | |
2399 | err = nfsd_xattr_errno(len); | |
2400 | goto out; | |
2401 | } | |
2402 | ||
2403 | if (len > XATTR_LIST_MAX) { | |
2404 | err = nfserr_xattr2big; | |
2405 | goto out; | |
2406 | } | |
2407 | ||
22b620ec | 2408 | buf = kvmalloc(len, GFP_KERNEL); |
32119446 FL |
2409 | if (buf == NULL) { |
2410 | err = nfserr_jukebox; | |
2411 | goto out; | |
2412 | } | |
2413 | ||
2414 | len = vfs_listxattr(dentry, buf, len); | |
2415 | if (len <= 0) { | |
2416 | kvfree(buf); | |
2417 | err = nfsd_xattr_errno(len); | |
2418 | goto out; | |
2419 | } | |
2420 | ||
2421 | *lenp = len; | |
2422 | *bufp = buf; | |
2423 | ||
2424 | err = nfs_ok; | |
2425 | out: | |
2426 | inode_unlock_shared(inode); | |
2427 | ||
2428 | return err; | |
2429 | } | |
2430 | ||
bb4d53d6 N |
2431 | /** |
2432 | * nfsd_removexattr - Remove an extended attribute | |
2433 | * @rqstp: RPC transaction being executed | |
2434 | * @fhp: NFS filehandle of object with xattr to remove | |
2435 | * @name: name of xattr to remove (NUL-terminate) | |
2436 | * | |
2437 | * Pass in a NULL pointer for delegated_inode, and let the client deal | |
2438 | * with NFS4ERR_DELAY (same as with e.g. setattr and remove). | |
2439 | * | |
2440 | * Returns nfs_ok on success, or an nfsstat in network byte order. | |
32119446 FL |
2441 | */ |
2442 | __be32 | |
2443 | nfsd_removexattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name) | |
2444 | { | |
8237284a CL |
2445 | __be32 err; |
2446 | int ret; | |
32119446 FL |
2447 | |
2448 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_WRITE); | |
2449 | if (err) | |
2450 | return err; | |
2451 | ||
2452 | ret = fh_want_write(fhp); | |
2453 | if (ret) | |
2454 | return nfserrno(ret); | |
2455 | ||
bb4d53d6 | 2456 | inode_lock(fhp->fh_dentry->d_inode); |
a332018a JL |
2457 | err = fh_fill_pre_attrs(fhp); |
2458 | if (err != nfs_ok) | |
2459 | goto out_unlock; | |
4609e1f1 | 2460 | ret = __vfs_removexattr_locked(&nop_mnt_idmap, fhp->fh_dentry, |
c7c7a1a1 | 2461 | name, NULL); |
a332018a | 2462 | err = nfsd_xattr_errno(ret); |
bb4d53d6 | 2463 | fh_fill_post_attrs(fhp); |
a332018a | 2464 | out_unlock: |
bb4d53d6 | 2465 | inode_unlock(fhp->fh_dentry->d_inode); |
32119446 FL |
2466 | fh_drop_write(fhp); |
2467 | ||
a332018a | 2468 | return err; |
32119446 FL |
2469 | } |
2470 | ||
2471 | __be32 | |
2472 | nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name, | |
2473 | void *buf, u32 len, u32 flags) | |
2474 | { | |
8237284a CL |
2475 | __be32 err; |
2476 | int ret; | |
32119446 FL |
2477 | |
2478 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_WRITE); | |
2479 | if (err) | |
2480 | return err; | |
2481 | ||
2482 | ret = fh_want_write(fhp); | |
2483 | if (ret) | |
2484 | return nfserrno(ret); | |
bb4d53d6 | 2485 | inode_lock(fhp->fh_dentry->d_inode); |
a332018a JL |
2486 | err = fh_fill_pre_attrs(fhp); |
2487 | if (err != nfs_ok) | |
2488 | goto out_unlock; | |
2489 | ret = __vfs_setxattr_locked(&nop_mnt_idmap, fhp->fh_dentry, | |
2490 | name, buf, len, flags, NULL); | |
bb4d53d6 | 2491 | fh_fill_post_attrs(fhp); |
a332018a JL |
2492 | err = nfsd_xattr_errno(ret); |
2493 | out_unlock: | |
bb4d53d6 | 2494 | inode_unlock(fhp->fh_dentry->d_inode); |
32119446 | 2495 | fh_drop_write(fhp); |
a332018a | 2496 | return err; |
32119446 FL |
2497 | } |
2498 | #endif | |
2499 | ||
1da177e4 LT |
2500 | /* |
2501 | * Check for a user's access permissions to this inode. | |
2502 | */ | |
6264d69d | 2503 | __be32 |
0ec757df BF |
2504 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
2505 | struct dentry *dentry, int acc) | |
1da177e4 | 2506 | { |
2b0143b5 | 2507 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
2508 | int err; |
2509 | ||
aea93397 | 2510 | if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) |
1da177e4 LT |
2511 | return 0; |
2512 | #if 0 | |
2513 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
2514 | acc, | |
8837abca MS |
2515 | (acc & NFSD_MAY_READ)? " read" : "", |
2516 | (acc & NFSD_MAY_WRITE)? " write" : "", | |
2517 | (acc & NFSD_MAY_EXEC)? " exec" : "", | |
2518 | (acc & NFSD_MAY_SATTR)? " sattr" : "", | |
2519 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", | |
2520 | (acc & NFSD_MAY_LOCK)? " lock" : "", | |
2521 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1da177e4 LT |
2522 | inode->i_mode, |
2523 | IS_IMMUTABLE(inode)? " immut" : "", | |
2524 | IS_APPEND(inode)? " append" : "", | |
2c463e95 | 2525 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
1da177e4 | 2526 | dprintk(" owner %d/%d user %d/%d\n", |
5cc0a840 | 2527 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
1da177e4 LT |
2528 | #endif |
2529 | ||
2530 | /* Normally we reject any write/sattr etc access on a read-only file | |
2531 | * system. But if it is IRIX doing check on write-access for a | |
2532 | * device special file, we ignore rofs. | |
2533 | */ | |
8837abca MS |
2534 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
2535 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { | |
2c463e95 DH |
2536 | if (exp_rdonly(rqstp, exp) || |
2537 | __mnt_is_readonly(exp->ex_path.mnt)) | |
1da177e4 | 2538 | return nfserr_rofs; |
8837abca | 2539 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
1da177e4 LT |
2540 | return nfserr_perm; |
2541 | } | |
8837abca | 2542 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
1da177e4 LT |
2543 | return nfserr_perm; |
2544 | ||
8837abca | 2545 | if (acc & NFSD_MAY_LOCK) { |
1da177e4 LT |
2546 | /* If we cannot rely on authentication in NLM requests, |
2547 | * just allow locks, otherwise require read permission, or | |
2548 | * ownership | |
2549 | */ | |
2550 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
2551 | return 0; | |
2552 | else | |
8837abca | 2553 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
1da177e4 LT |
2554 | } |
2555 | /* | |
2556 | * The file owner always gets access permission for accesses that | |
2557 | * would normally be checked at open time. This is to make | |
2558 | * file access work even when the client has done a fchmod(fd, 0). | |
2559 | * | |
2560 | * However, `cp foo bar' should fail nevertheless when bar is | |
2561 | * readonly. A sensible way to do this might be to reject all | |
2562 | * attempts to truncate a read-only file, because a creat() call | |
2563 | * always implies file truncation. | |
2564 | * ... but this isn't really fair. A process may reasonably call | |
2565 | * ftruncate on an open file descriptor on a file with perm 000. | |
2566 | * We must trust the client to do permission checking - using "ACCESS" | |
2567 | * with NFSv3. | |
2568 | */ | |
8837abca | 2569 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
6fab8779 | 2570 | uid_eq(inode->i_uid, current_fsuid())) |
1da177e4 LT |
2571 | return 0; |
2572 | ||
8837abca | 2573 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
4609e1f1 | 2574 | err = inode_permission(&nop_mnt_idmap, inode, |
47291baa | 2575 | acc & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1da177e4 LT |
2576 | |
2577 | /* Allow read access to binaries even when mode 111 */ | |
2578 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
a043226b BF |
2579 | (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || |
2580 | acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) | |
4609e1f1 | 2581 | err = inode_permission(&nop_mnt_idmap, inode, MAY_EXEC); |
1da177e4 LT |
2582 | |
2583 | return err? nfserrno(err) : 0; | |
2584 | } |