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 BH |
27 | #include <linux/jhash.h> |
28 | #include <linux/ima.h> | |
cbcc268b | 29 | #include <linux/pagemap.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
7c0f6ba6 | 31 | #include <linux/uaccess.h> |
f501912a BM |
32 | #include <linux/exportfs.h> |
33 | #include <linux/writeback.h> | |
18032ca0 | 34 | #include <linux/security.h> |
9a74af21 | 35 | |
9a74af21 | 36 | #include "xdr3.h" |
9a74af21 | 37 | |
5be196e5 | 38 | #ifdef CONFIG_NFSD_V4 |
ffa0160a | 39 | #include "../internal.h" |
2ca72e17 BF |
40 | #include "acl.h" |
41 | #include "idmap.h" | |
a2f4c3fa | 42 | #include "xdr4.h" |
1da177e4 LT |
43 | #endif /* CONFIG_NFSD_V4 */ |
44 | ||
9a74af21 BH |
45 | #include "nfsd.h" |
46 | #include "vfs.h" | |
b4935239 | 47 | #include "filecache.h" |
6e8b50d1 | 48 | #include "trace.h" |
1da177e4 LT |
49 | |
50 | #define NFSDDBG_FACILITY NFSDDBG_FILEOP | |
1da177e4 | 51 | |
cb12fae1 JL |
52 | /** |
53 | * nfserrno - Map Linux errnos to NFS errnos | |
54 | * @errno: POSIX(-ish) error code to be mapped | |
55 | * | |
56 | * Returns the appropriate (net-endian) nfserr_* (or nfs_ok if errno is 0). If | |
57 | * it's an error we don't expect, log it once and return nfserr_io. | |
58 | */ | |
59 | __be32 | |
60 | nfserrno (int errno) | |
61 | { | |
62 | static struct { | |
63 | __be32 nfserr; | |
64 | int syserr; | |
65 | } nfs_errtbl[] = { | |
66 | { nfs_ok, 0 }, | |
67 | { nfserr_perm, -EPERM }, | |
68 | { nfserr_noent, -ENOENT }, | |
69 | { nfserr_io, -EIO }, | |
70 | { nfserr_nxio, -ENXIO }, | |
71 | { nfserr_fbig, -E2BIG }, | |
72 | { nfserr_stale, -EBADF }, | |
73 | { nfserr_acces, -EACCES }, | |
74 | { nfserr_exist, -EEXIST }, | |
75 | { nfserr_xdev, -EXDEV }, | |
76 | { nfserr_mlink, -EMLINK }, | |
77 | { nfserr_nodev, -ENODEV }, | |
78 | { nfserr_notdir, -ENOTDIR }, | |
79 | { nfserr_isdir, -EISDIR }, | |
80 | { nfserr_inval, -EINVAL }, | |
81 | { nfserr_fbig, -EFBIG }, | |
82 | { nfserr_nospc, -ENOSPC }, | |
83 | { nfserr_rofs, -EROFS }, | |
84 | { nfserr_mlink, -EMLINK }, | |
85 | { nfserr_nametoolong, -ENAMETOOLONG }, | |
86 | { nfserr_notempty, -ENOTEMPTY }, | |
87 | { nfserr_dquot, -EDQUOT }, | |
88 | { nfserr_stale, -ESTALE }, | |
89 | { nfserr_jukebox, -ETIMEDOUT }, | |
90 | { nfserr_jukebox, -ERESTARTSYS }, | |
91 | { nfserr_jukebox, -EAGAIN }, | |
92 | { nfserr_jukebox, -EWOULDBLOCK }, | |
93 | { nfserr_jukebox, -ENOMEM }, | |
94 | { nfserr_io, -ETXTBSY }, | |
95 | { nfserr_notsupp, -EOPNOTSUPP }, | |
96 | { nfserr_toosmall, -ETOOSMALL }, | |
97 | { nfserr_serverfault, -ESERVERFAULT }, | |
98 | { nfserr_serverfault, -ENFILE }, | |
99 | { nfserr_io, -EREMOTEIO }, | |
100 | { nfserr_stale, -EOPENSTALE }, | |
101 | { nfserr_io, -EUCLEAN }, | |
102 | { nfserr_perm, -ENOKEY }, | |
103 | { nfserr_no_grace, -ENOGRACE}, | |
104 | }; | |
105 | int i; | |
106 | ||
107 | for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) { | |
108 | if (nfs_errtbl[i].syserr == errno) | |
109 | return nfs_errtbl[i].nfserr; | |
110 | } | |
111 | WARN_ONCE(1, "nfsd: non-standard errno: %d\n", errno); | |
112 | return nfserr_io; | |
113 | } | |
114 | ||
1da177e4 LT |
115 | /* |
116 | * Called from nfsd_lookup and encode_dirent. Check if we have crossed | |
117 | * a mount point. | |
e0bb89ef | 118 | * Returns -EAGAIN or -ETIMEDOUT leaving *dpp and *expp unchanged, |
1da177e4 LT |
119 | * or nfs_ok having possibly changed *dpp and *expp |
120 | */ | |
121 | int | |
122 | nfsd_cross_mnt(struct svc_rqst *rqstp, struct dentry **dpp, | |
123 | struct svc_export **expp) | |
124 | { | |
125 | struct svc_export *exp = *expp, *exp2 = NULL; | |
126 | struct dentry *dentry = *dpp; | |
91c9fa8f AV |
127 | struct path path = {.mnt = mntget(exp->ex_path.mnt), |
128 | .dentry = dget(dentry)}; | |
e1f19857 | 129 | unsigned int follow_flags = 0; |
6264d69d | 130 | int err = 0; |
1da177e4 | 131 | |
e1f19857 RW |
132 | if (exp->ex_flags & NFSEXP_CROSSMOUNT) |
133 | follow_flags = LOOKUP_AUTOMOUNT; | |
134 | ||
135 | err = follow_down(&path, follow_flags); | |
cc53ce53 DH |
136 | if (err < 0) |
137 | goto out; | |
99bbf6ec N |
138 | if (path.mnt == exp->ex_path.mnt && path.dentry == dentry && |
139 | nfsd_mountpoint(dentry, exp) == 2) { | |
140 | /* This is only a mountpoint in some other namespace */ | |
141 | path_put(&path); | |
142 | goto out; | |
143 | } | |
1da177e4 | 144 | |
91c9fa8f | 145 | exp2 = rqst_exp_get_by_name(rqstp, &path); |
1da177e4 | 146 | if (IS_ERR(exp2)) { |
3b6cee7b BF |
147 | err = PTR_ERR(exp2); |
148 | /* | |
149 | * We normally allow NFS clients to continue | |
150 | * "underneath" a mountpoint that is not exported. | |
151 | * The exception is V4ROOT, where no traversal is ever | |
152 | * allowed without an explicit export of the new | |
153 | * directory. | |
154 | */ | |
155 | if (err == -ENOENT && !(exp->ex_flags & NFSEXP_V4ROOT)) | |
156 | err = 0; | |
91c9fa8f | 157 | path_put(&path); |
1da177e4 LT |
158 | goto out; |
159 | } | |
3c394dda SD |
160 | if (nfsd_v4client(rqstp) || |
161 | (exp->ex_flags & NFSEXP_CROSSMOUNT) || EX_NOHIDE(exp2)) { | |
1da177e4 | 162 | /* successfully crossed mount point */ |
1644ccc8 | 163 | /* |
91c9fa8f AV |
164 | * This is subtle: path.dentry is *not* on path.mnt |
165 | * at this point. The only reason we are safe is that | |
166 | * original mnt is pinned down by exp, so we should | |
167 | * put path *before* putting exp | |
1644ccc8 | 168 | */ |
91c9fa8f AV |
169 | *dpp = path.dentry; |
170 | path.dentry = dentry; | |
1644ccc8 | 171 | *expp = exp2; |
91c9fa8f | 172 | exp2 = exp; |
1da177e4 | 173 | } |
91c9fa8f AV |
174 | path_put(&path); |
175 | exp_put(exp2); | |
1da177e4 LT |
176 | out: |
177 | return err; | |
178 | } | |
179 | ||
289ede45 BF |
180 | static void follow_to_parent(struct path *path) |
181 | { | |
182 | struct dentry *dp; | |
183 | ||
184 | while (path->dentry == path->mnt->mnt_root && follow_up(path)) | |
185 | ; | |
186 | dp = dget_parent(path->dentry); | |
187 | dput(path->dentry); | |
188 | path->dentry = dp; | |
189 | } | |
190 | ||
191 | static int nfsd_lookup_parent(struct svc_rqst *rqstp, struct dentry *dparent, struct svc_export **exp, struct dentry **dentryp) | |
192 | { | |
193 | struct svc_export *exp2; | |
194 | struct path path = {.mnt = mntget((*exp)->ex_path.mnt), | |
195 | .dentry = dget(dparent)}; | |
196 | ||
197 | follow_to_parent(&path); | |
198 | ||
199 | exp2 = rqst_exp_parent(rqstp, &path); | |
200 | if (PTR_ERR(exp2) == -ENOENT) { | |
201 | *dentryp = dget(dparent); | |
202 | } else if (IS_ERR(exp2)) { | |
203 | path_put(&path); | |
204 | return PTR_ERR(exp2); | |
205 | } else { | |
206 | *dentryp = dget(path.dentry); | |
207 | exp_put(*exp); | |
208 | *exp = exp2; | |
209 | } | |
210 | path_put(&path); | |
211 | return 0; | |
212 | } | |
213 | ||
82ead7fe BF |
214 | /* |
215 | * For nfsd purposes, we treat V4ROOT exports as though there was an | |
216 | * export at *every* directory. | |
99bbf6ec N |
217 | * We return: |
218 | * '1' if this dentry *must* be an export point, | |
219 | * '2' if it might be, if there is really a mount here, and | |
220 | * '0' if there is no chance of an export point here. | |
82ead7fe | 221 | */ |
3227fa41 | 222 | int nfsd_mountpoint(struct dentry *dentry, struct svc_export *exp) |
82ead7fe | 223 | { |
99bbf6ec N |
224 | if (!d_inode(dentry)) |
225 | return 0; | |
226 | if (exp->ex_flags & NFSEXP_V4ROOT) | |
82ead7fe | 227 | return 1; |
11fcee02 TM |
228 | if (nfsd4_is_junction(dentry)) |
229 | return 1; | |
50f5fdae | 230 | if (d_managed(dentry)) |
99bbf6ec N |
231 | /* |
232 | * Might only be a mountpoint in a different namespace, | |
233 | * but we need to check. | |
234 | */ | |
235 | return 2; | |
236 | return 0; | |
82ead7fe BF |
237 | } |
238 | ||
6264d69d | 239 | __be32 |
6c0a654d | 240 | nfsd_lookup_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp, |
5a022fc8 | 241 | const char *name, unsigned int len, |
6c0a654d | 242 | struct svc_export **exp_ret, struct dentry **dentry_ret) |
1da177e4 LT |
243 | { |
244 | struct svc_export *exp; | |
245 | struct dentry *dparent; | |
246 | struct dentry *dentry; | |
6264d69d | 247 | int host_err; |
1da177e4 LT |
248 | |
249 | dprintk("nfsd: nfsd_lookup(fh %s, %.*s)\n", SVCFH_fmt(fhp), len,name); | |
250 | ||
1da177e4 | 251 | dparent = fhp->fh_dentry; |
bf18f163 | 252 | exp = exp_get(fhp->fh_export); |
1da177e4 | 253 | |
1da177e4 LT |
254 | /* Lookup the name, but don't follow links */ |
255 | if (isdotent(name, len)) { | |
256 | if (len==1) | |
257 | dentry = dget(dparent); | |
54775491 | 258 | else if (dparent != exp->ex_path.dentry) |
1da177e4 | 259 | dentry = dget_parent(dparent); |
fed83811 | 260 | else if (!EX_NOHIDE(exp) && !nfsd_v4client(rqstp)) |
1da177e4 LT |
261 | dentry = dget(dparent); /* .. == . just like at / */ |
262 | else { | |
263 | /* checking mountpoint crossing is very different when stepping up */ | |
289ede45 BF |
264 | host_err = nfsd_lookup_parent(rqstp, dparent, &exp, &dentry); |
265 | if (host_err) | |
1da177e4 | 266 | goto out_nfserr; |
1da177e4 LT |
267 | } |
268 | } else { | |
19d008b4 | 269 | dentry = lookup_one_len_unlocked(name, dparent, len); |
6264d69d | 270 | host_err = PTR_ERR(dentry); |
1da177e4 LT |
271 | if (IS_ERR(dentry)) |
272 | goto out_nfserr; | |
82ead7fe | 273 | if (nfsd_mountpoint(dentry, exp)) { |
19d008b4 N |
274 | host_err = nfsd_cross_mnt(rqstp, &dentry, &exp); |
275 | if (host_err) { | |
1da177e4 LT |
276 | dput(dentry); |
277 | goto out_nfserr; | |
278 | } | |
279 | } | |
280 | } | |
6c0a654d BF |
281 | *dentry_ret = dentry; |
282 | *exp_ret = exp; | |
283 | return 0; | |
284 | ||
285 | out_nfserr: | |
286 | exp_put(exp); | |
287 | return nfserrno(host_err); | |
288 | } | |
289 | ||
19d008b4 N |
290 | /** |
291 | * nfsd_lookup - look up a single path component for nfsd | |
292 | * | |
293 | * @rqstp: the request context | |
294 | * @fhp: the file handle of the directory | |
295 | * @name: the component name, or %NULL to look up parent | |
296 | * @len: length of name to examine | |
297 | * @resfh: pointer to pre-initialised filehandle to hold result. | |
298 | * | |
6c0a654d BF |
299 | * Look up one component of a pathname. |
300 | * N.B. After this call _both_ fhp and resfh need an fh_put | |
301 | * | |
302 | * If the lookup would cross a mountpoint, and the mounted filesystem | |
303 | * is exported to the client with NFSEXP_NOHIDE, then the lookup is | |
304 | * accepted as it stands and the mounted directory is | |
305 | * returned. Otherwise the covered directory is returned. | |
306 | * NOTE: this mountpoint crossing is not supported properly by all | |
307 | * clients and is explicitly disallowed for NFSv3 | |
19d008b4 | 308 | * |
6c0a654d BF |
309 | */ |
310 | __be32 | |
311 | nfsd_lookup(struct svc_rqst *rqstp, struct svc_fh *fhp, const char *name, | |
19d008b4 | 312 | unsigned int len, struct svc_fh *resfh) |
6c0a654d BF |
313 | { |
314 | struct svc_export *exp; | |
315 | struct dentry *dentry; | |
316 | __be32 err; | |
317 | ||
29a78a3e BF |
318 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_EXEC); |
319 | if (err) | |
320 | return err; | |
6c0a654d BF |
321 | err = nfsd_lookup_dentry(rqstp, fhp, name, len, &exp, &dentry); |
322 | if (err) | |
323 | return err; | |
32c1eb0c AA |
324 | err = check_nfsd_access(exp, rqstp); |
325 | if (err) | |
326 | goto out; | |
1da177e4 LT |
327 | /* |
328 | * Note: we compose the file handle now, but as the | |
329 | * dentry may be negative, it may need to be updated. | |
330 | */ | |
331 | err = fh_compose(resfh, exp, dentry, fhp); | |
2b0143b5 | 332 | if (!err && d_really_is_negative(dentry)) |
1da177e4 | 333 | err = nfserr_noent; |
32c1eb0c | 334 | out: |
1da177e4 | 335 | dput(dentry); |
1da177e4 LT |
336 | exp_put(exp); |
337 | return err; | |
1da177e4 LT |
338 | } |
339 | ||
1b2021bd TM |
340 | static void |
341 | commit_reset_write_verifier(struct nfsd_net *nn, struct svc_rqst *rqstp, | |
342 | int err) | |
343 | { | |
344 | switch (err) { | |
345 | case -EAGAIN: | |
346 | case -ESTALE: | |
347 | /* | |
348 | * Neither of these are the result of a problem with | |
349 | * durable storage, so avoid a write verifier reset. | |
350 | */ | |
351 | break; | |
352 | default: | |
353 | nfsd_reset_write_verifier(nn); | |
354 | trace_nfsd_writeverf_reset(nn, rqstp, err); | |
355 | } | |
356 | } | |
357 | ||
f501912a BM |
358 | /* |
359 | * Commit metadata changes to stable storage. | |
360 | */ | |
361 | static int | |
57f64034 | 362 | commit_inode_metadata(struct inode *inode) |
f501912a | 363 | { |
f501912a | 364 | const struct export_operations *export_ops = inode->i_sb->s_export_op; |
f501912a | 365 | |
c3765016 CH |
366 | if (export_ops->commit_metadata) |
367 | return export_ops->commit_metadata(inode); | |
368 | return sync_inode_metadata(inode, 1); | |
f501912a | 369 | } |
6c0a654d | 370 | |
57f64034 TM |
371 | static int |
372 | commit_metadata(struct svc_fh *fhp) | |
373 | { | |
374 | struct inode *inode = d_inode(fhp->fh_dentry); | |
375 | ||
376 | if (!EX_ISSYNC(fhp->fh_export)) | |
377 | return 0; | |
378 | return commit_inode_metadata(inode); | |
379 | } | |
380 | ||
1da177e4 | 381 | /* |
818e5a22 CH |
382 | * Go over the attributes and take care of the small differences between |
383 | * NFS semantics and what Linux expects. | |
1da177e4 | 384 | */ |
818e5a22 CH |
385 | static void |
386 | nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) | |
1da177e4 | 387 | { |
00801cd9 N |
388 | /* Ignore mode updates on symlinks */ |
389 | if (S_ISLNK(inode->i_mode)) | |
390 | iap->ia_valid &= ~ATTR_MODE; | |
391 | ||
ca456252 | 392 | /* sanitize the mode change */ |
1da177e4 LT |
393 | if (iap->ia_valid & ATTR_MODE) { |
394 | iap->ia_mode &= S_IALLUGO; | |
dee3209d | 395 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
ca456252 JL |
396 | } |
397 | ||
398 | /* Revoke setuid/setgid on chown */ | |
0953e620 | 399 | if (!S_ISDIR(inode->i_mode) && |
c4fa6d7c | 400 | ((iap->ia_valid & ATTR_UID) || (iap->ia_valid & ATTR_GID))) { |
ca456252 JL |
401 | iap->ia_valid |= ATTR_KILL_PRIV; |
402 | if (iap->ia_valid & ATTR_MODE) { | |
403 | /* we're setting mode too, just clear the s*id bits */ | |
8a0ce7d9 | 404 | iap->ia_mode &= ~S_ISUID; |
ca456252 JL |
405 | if (iap->ia_mode & S_IXGRP) |
406 | iap->ia_mode &= ~S_ISGID; | |
407 | } else { | |
408 | /* set ATTR_KILL_* bits and let VFS handle it */ | |
2d8ae8c4 CB |
409 | iap->ia_valid |= ATTR_KILL_SUID; |
410 | iap->ia_valid |= | |
411 | setattr_should_drop_sgid(&nop_mnt_idmap, inode); | |
8a0ce7d9 | 412 | } |
1da177e4 | 413 | } |
818e5a22 CH |
414 | } |
415 | ||
0839ffb8 BF |
416 | static __be32 |
417 | nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
418 | struct iattr *iap) | |
419 | { | |
420 | struct inode *inode = d_inode(fhp->fh_dentry); | |
0839ffb8 BF |
421 | |
422 | if (iap->ia_size < inode->i_size) { | |
423 | __be32 err; | |
424 | ||
425 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, | |
426 | NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); | |
427 | if (err) | |
428 | return err; | |
429 | } | |
f7e33bdb | 430 | return nfserrno(get_write_access(inode)); |
0839ffb8 BF |
431 | } |
432 | ||
c0aa1913 CL |
433 | static int __nfsd_setattr(struct dentry *dentry, struct iattr *iap) |
434 | { | |
435 | int host_err; | |
436 | ||
437 | if (iap->ia_valid & ATTR_SIZE) { | |
438 | /* | |
439 | * RFC5661, Section 18.30.4: | |
440 | * Changing the size of a file with SETATTR indirectly | |
441 | * changes the time_modify and change attributes. | |
442 | * | |
443 | * (and similar for the older RFCs) | |
444 | */ | |
445 | struct iattr size_attr = { | |
446 | .ia_valid = ATTR_SIZE | ATTR_CTIME | ATTR_MTIME, | |
447 | .ia_size = iap->ia_size, | |
448 | }; | |
449 | ||
450 | if (iap->ia_size < 0) | |
451 | return -EFBIG; | |
452 | ||
abf08576 | 453 | host_err = notify_change(&nop_mnt_idmap, dentry, &size_attr, NULL); |
c0aa1913 CL |
454 | if (host_err) |
455 | return host_err; | |
456 | iap->ia_valid &= ~ATTR_SIZE; | |
457 | ||
458 | /* | |
459 | * Avoid the additional setattr call below if the only other | |
460 | * attribute that the client sends is the mtime, as we update | |
461 | * it as part of the size change above. | |
462 | */ | |
463 | if ((iap->ia_valid & ~ATTR_MTIME) == 0) | |
464 | return 0; | |
465 | } | |
466 | ||
467 | if (!iap->ia_valid) | |
468 | return 0; | |
469 | ||
470 | iap->ia_valid |= ATTR_CTIME; | |
abf08576 | 471 | return notify_change(&nop_mnt_idmap, dentry, iap, NULL); |
c0aa1913 CL |
472 | } |
473 | ||
474 | /** | |
475 | * nfsd_setattr - Set various file attributes. | |
476 | * @rqstp: controlling RPC transaction | |
477 | * @fhp: filehandle of target | |
478 | * @attr: attributes to set | |
479 | * @check_guard: set to 1 if guardtime is a valid timestamp | |
480 | * @guardtime: do not act if ctime.tv_sec does not match this timestamp | |
481 | * | |
482 | * This call may adjust the contents of @attr (in particular, this | |
483 | * call may change the bits in the na_iattr.ia_valid field). | |
484 | * | |
485 | * Returns nfs_ok on success, otherwise an NFS status code is | |
486 | * returned. Caller must release @fhp by calling fh_put in either | |
487 | * case. | |
818e5a22 CH |
488 | */ |
489 | __be32 | |
7fe2a71d N |
490 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, |
491 | struct nfsd_attrs *attr, | |
2a1aa489 | 492 | int check_guard, time64_t guardtime) |
818e5a22 CH |
493 | { |
494 | struct dentry *dentry; | |
495 | struct inode *inode; | |
7fe2a71d | 496 | struct iattr *iap = attr->na_iattr; |
818e5a22 CH |
497 | int accmode = NFSD_MAY_SATTR; |
498 | umode_t ftype = 0; | |
499 | __be32 err; | |
c0aa1913 | 500 | int host_err; |
9f67f189 | 501 | bool get_write_count; |
758e99fe | 502 | bool size_change = (iap->ia_valid & ATTR_SIZE); |
34b91dda | 503 | int retries; |
818e5a22 | 504 | |
255fbca6 | 505 | if (iap->ia_valid & ATTR_SIZE) { |
818e5a22 | 506 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; |
818e5a22 | 507 | ftype = S_IFREG; |
255fbca6 | 508 | } |
509 | ||
510 | /* | |
511 | * If utimes(2) and friends are called with times not NULL, we should | |
512 | * not set NFSD_MAY_WRITE bit. Otherwise fh_verify->nfsd_permission | |
e977cc83 | 513 | * will return EACCES, when the caller's effective UID does not match |
255fbca6 | 514 | * the owner of the file, and the caller is not privileged. In this |
515 | * situation, we should return EPERM(notify_change will return this). | |
516 | */ | |
517 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME)) { | |
518 | accmode |= NFSD_MAY_OWNER_OVERRIDE; | |
519 | if (!(iap->ia_valid & (ATTR_ATIME_SET | ATTR_MTIME_SET))) | |
520 | accmode |= NFSD_MAY_WRITE; | |
521 | } | |
818e5a22 | 522 | |
9f67f189 BF |
523 | /* Callers that do fh_verify should do the fh_want_write: */ |
524 | get_write_count = !fhp->fh_dentry; | |
525 | ||
818e5a22 CH |
526 | /* Get inode */ |
527 | err = fh_verify(rqstp, fhp, ftype, accmode); | |
528 | if (err) | |
758e99fe | 529 | return err; |
9f67f189 BF |
530 | if (get_write_count) { |
531 | host_err = fh_want_write(fhp); | |
532 | if (host_err) | |
758e99fe | 533 | goto out; |
9f67f189 | 534 | } |
818e5a22 CH |
535 | |
536 | dentry = fhp->fh_dentry; | |
2b0143b5 | 537 | inode = d_inode(dentry); |
818e5a22 | 538 | |
818e5a22 CH |
539 | nfsd_sanitize_attrs(inode, iap); |
540 | ||
11fec9b9 | 541 | if (check_guard && guardtime != inode_get_ctime_sec(inode)) |
758e99fe CH |
542 | return nfserr_notsync; |
543 | ||
818e5a22 CH |
544 | /* |
545 | * The size case is special, it changes the file in addition to the | |
783112f7 CH |
546 | * attributes, and file systems don't expect it to be mixed with |
547 | * "random" attribute changes. We thus split out the size change | |
548 | * into a separate call to ->setattr, and do the rest as a separate | |
549 | * setattr call. | |
818e5a22 | 550 | */ |
758e99fe | 551 | if (size_change) { |
0839ffb8 BF |
552 | err = nfsd_get_write_access(rqstp, fhp, iap); |
553 | if (err) | |
758e99fe | 554 | return err; |
783112f7 | 555 | } |
f0c63124 | 556 | |
bb4d53d6 | 557 | inode_lock(inode); |
34b91dda | 558 | for (retries = 1;;) { |
d53d7008 JL |
559 | struct iattr attrs; |
560 | ||
561 | /* | |
562 | * notify_change() can alter its iattr argument, making | |
563 | * @iap unsuitable for submission multiple times. Make a | |
564 | * copy for every loop iteration. | |
565 | */ | |
566 | attrs = *iap; | |
567 | host_err = __nfsd_setattr(dentry, &attrs); | |
34b91dda CL |
568 | if (host_err != -EAGAIN || !retries--) |
569 | break; | |
570 | if (!nfsd_wait_for_delegreturn(rqstp, inode)) | |
571 | break; | |
572 | } | |
d6a97d3f N |
573 | if (attr->na_seclabel && attr->na_seclabel->len) |
574 | attr->na_labelerr = security_inode_setsecctx(dentry, | |
575 | attr->na_seclabel->data, attr->na_seclabel->len); | |
c0cbe707 | 576 | if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && attr->na_pacl) |
13e83a49 | 577 | attr->na_aclerr = set_posix_acl(&nop_mnt_idmap, |
138060ba | 578 | dentry, ACL_TYPE_ACCESS, |
c0cbe707 N |
579 | attr->na_pacl); |
580 | if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && | |
581 | !attr->na_aclerr && attr->na_dpacl && S_ISDIR(inode->i_mode)) | |
13e83a49 | 582 | attr->na_aclerr = set_posix_acl(&nop_mnt_idmap, |
138060ba | 583 | dentry, ACL_TYPE_DEFAULT, |
c0cbe707 | 584 | attr->na_dpacl); |
bb4d53d6 | 585 | inode_unlock(inode); |
0839ffb8 BF |
586 | if (size_change) |
587 | put_write_access(inode); | |
0839ffb8 | 588 | out: |
758e99fe CH |
589 | if (!host_err) |
590 | host_err = commit_metadata(fhp); | |
591 | return nfserrno(host_err); | |
1da177e4 LT |
592 | } |
593 | ||
5be196e5 | 594 | #if defined(CONFIG_NFSD_V4) |
9b4146e8 CL |
595 | /* |
596 | * NFS junction information is stored in an extended attribute. | |
597 | */ | |
598 | #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" | |
599 | ||
600 | /** | |
601 | * nfsd4_is_junction - Test if an object could be an NFS junction | |
602 | * | |
603 | * @dentry: object to test | |
604 | * | |
605 | * Returns 1 if "dentry" appears to contain NFS junction information. | |
606 | * Otherwise 0 is returned. | |
607 | */ | |
11fcee02 TM |
608 | int nfsd4_is_junction(struct dentry *dentry) |
609 | { | |
2b0143b5 | 610 | struct inode *inode = d_inode(dentry); |
11fcee02 TM |
611 | |
612 | if (inode == NULL) | |
613 | return 0; | |
614 | if (inode->i_mode & S_IXUGO) | |
615 | return 0; | |
616 | if (!(inode->i_mode & S_ISVTX)) | |
617 | return 0; | |
4609e1f1 | 618 | if (vfs_getxattr(&nop_mnt_idmap, dentry, NFSD_JUNCTION_XATTR_NAME, |
c7c7a1a1 | 619 | NULL, 0) <= 0) |
11fcee02 TM |
620 | return 0; |
621 | return 1; | |
622 | } | |
18032ca0 | 623 | |
a2f4c3fa TM |
624 | static struct nfsd4_compound_state *nfsd4_get_cstate(struct svc_rqst *rqstp) |
625 | { | |
626 | return &((struct nfsd4_compoundres *)rqstp->rq_resp)->cstate; | |
627 | } | |
628 | ||
629 | __be32 nfsd4_clone_file_range(struct svc_rqst *rqstp, | |
630 | struct nfsd_file *nf_src, u64 src_pos, | |
631 | struct nfsd_file *nf_dst, u64 dst_pos, | |
632 | u64 count, bool sync) | |
ffa0160a | 633 | { |
b66ae6dd TM |
634 | struct file *src = nf_src->nf_file; |
635 | struct file *dst = nf_dst->nf_file; | |
555dbf1a | 636 | errseq_t since; |
42ec3d4c | 637 | loff_t cloned; |
1b28d756 | 638 | __be32 ret = 0; |
42ec3d4c | 639 | |
555dbf1a | 640 | since = READ_ONCE(dst->f_wb_err); |
452ce659 | 641 | cloned = vfs_clone_file_range(src, src_pos, dst, dst_pos, count, 0); |
1b28d756 TM |
642 | if (cloned < 0) { |
643 | ret = nfserrno(cloned); | |
644 | goto out_err; | |
645 | } | |
646 | if (count && cloned != count) { | |
647 | ret = nfserrno(-EINVAL); | |
648 | goto out_err; | |
649 | } | |
a25e3726 TM |
650 | if (sync) { |
651 | loff_t dst_end = count ? dst_pos + count - 1 : LLONG_MAX; | |
652 | int status = vfs_fsync_range(dst, dst_pos, dst_end, 0); | |
57f64034 | 653 | |
555dbf1a TM |
654 | if (!status) |
655 | status = filemap_check_wb_err(dst->f_mapping, since); | |
57f64034 TM |
656 | if (!status) |
657 | status = commit_inode_metadata(file_inode(src)); | |
1b28d756 | 658 | if (status < 0) { |
75acacb6 CL |
659 | struct nfsd_net *nn = net_generic(nf_dst->nf_net, |
660 | nfsd_net_id); | |
661 | ||
a2f4c3fa TM |
662 | trace_nfsd_clone_file_range_err(rqstp, |
663 | &nfsd4_get_cstate(rqstp)->save_fh, | |
664 | src_pos, | |
665 | &nfsd4_get_cstate(rqstp)->current_fh, | |
666 | dst_pos, | |
667 | count, status); | |
1b2021bd | 668 | commit_reset_write_verifier(nn, rqstp, status); |
1b28d756 TM |
669 | ret = nfserrno(status); |
670 | } | |
a25e3726 | 671 | } |
1b28d756 | 672 | out_err: |
1b28d756 | 673 | return ret; |
ffa0160a CH |
674 | } |
675 | ||
29ae7f9d AS |
676 | ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst, |
677 | u64 dst_pos, u64 count) | |
678 | { | |
868f9f2f | 679 | ssize_t ret; |
29ae7f9d AS |
680 | |
681 | /* | |
682 | * Limit copy to 4MB to prevent indefinitely blocking an nfsd | |
683 | * thread and client rpc slot. The choice of 4MB is somewhat | |
684 | * arbitrary. We might instead base this on r/wsize, or make it | |
685 | * tunable, or use a time instead of a byte limit, or implement | |
686 | * asynchronous copy. In theory a client could also recognize a | |
687 | * limit like this and pipeline multiple COPY requests. | |
688 | */ | |
689 | count = min_t(u64, count, 1 << 22); | |
868f9f2f AG |
690 | ret = vfs_copy_file_range(src, src_pos, dst, dst_pos, count, 0); |
691 | ||
692 | if (ret == -EOPNOTSUPP || ret == -EXDEV) | |
10bc8e4a AG |
693 | ret = vfs_copy_file_range(src, src_pos, dst, dst_pos, count, |
694 | COPY_FILE_SPLICE); | |
868f9f2f | 695 | return ret; |
29ae7f9d AS |
696 | } |
697 | ||
95d871f0 AS |
698 | __be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp, |
699 | struct file *file, loff_t offset, loff_t len, | |
700 | int flags) | |
701 | { | |
95d871f0 AS |
702 | int error; |
703 | ||
704 | if (!S_ISREG(file_inode(file)->i_mode)) | |
705 | return nfserr_inval; | |
706 | ||
95d871f0 AS |
707 | error = vfs_fallocate(file, flags, offset, len); |
708 | if (!error) | |
709 | error = commit_metadata(fhp); | |
710 | ||
711 | return nfserrno(error); | |
712 | } | |
6a85d6c7 | 713 | #endif /* defined(CONFIG_NFSD_V4) */ |
1da177e4 | 714 | |
1da177e4 LT |
715 | /* |
716 | * Check server access rights to a file system object | |
717 | */ | |
718 | struct accessmap { | |
719 | u32 access; | |
720 | int how; | |
721 | }; | |
722 | static struct accessmap nfs3_regaccess[] = { | |
8837abca MS |
723 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
724 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
725 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, | |
726 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, | |
1da177e4 | 727 | |
c11d7fd1 FL |
728 | #ifdef CONFIG_NFSD_V4 |
729 | { NFS4_ACCESS_XAREAD, NFSD_MAY_READ }, | |
730 | { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE }, | |
731 | { NFS4_ACCESS_XALIST, NFSD_MAY_READ }, | |
732 | #endif | |
733 | ||
1da177e4 LT |
734 | { 0, 0 } |
735 | }; | |
736 | ||
737 | static struct accessmap nfs3_diraccess[] = { | |
8837abca MS |
738 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
739 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, | |
740 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, | |
741 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, | |
742 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, | |
1da177e4 | 743 | |
c11d7fd1 FL |
744 | #ifdef CONFIG_NFSD_V4 |
745 | { NFS4_ACCESS_XAREAD, NFSD_MAY_READ }, | |
746 | { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE }, | |
747 | { NFS4_ACCESS_XALIST, NFSD_MAY_READ }, | |
748 | #endif | |
749 | ||
1da177e4 LT |
750 | { 0, 0 } |
751 | }; | |
752 | ||
753 | static struct accessmap nfs3_anyaccess[] = { | |
754 | /* Some clients - Solaris 2.6 at least, make an access call | |
755 | * to the server to check for access for things like /dev/null | |
756 | * (which really, the server doesn't care about). So | |
757 | * We provide simple access checking for them, looking | |
758 | * mainly at mode bits, and we make sure to ignore read-only | |
759 | * filesystem checks | |
760 | */ | |
8837abca MS |
761 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
762 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
763 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
764 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
1da177e4 LT |
765 | |
766 | { 0, 0 } | |
767 | }; | |
768 | ||
6264d69d | 769 | __be32 |
1da177e4 LT |
770 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
771 | { | |
772 | struct accessmap *map; | |
773 | struct svc_export *export; | |
774 | struct dentry *dentry; | |
775 | u32 query, result = 0, sresult = 0; | |
6264d69d | 776 | __be32 error; |
1da177e4 | 777 | |
8837abca | 778 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
779 | if (error) |
780 | goto out; | |
781 | ||
782 | export = fhp->fh_export; | |
783 | dentry = fhp->fh_dentry; | |
784 | ||
e36cb0b8 | 785 | if (d_is_reg(dentry)) |
1da177e4 | 786 | map = nfs3_regaccess; |
e36cb0b8 | 787 | else if (d_is_dir(dentry)) |
1da177e4 LT |
788 | map = nfs3_diraccess; |
789 | else | |
790 | map = nfs3_anyaccess; | |
791 | ||
792 | ||
793 | query = *access; | |
794 | for (; map->access; map++) { | |
795 | if (map->access & query) { | |
6264d69d | 796 | __be32 err2; |
1da177e4 LT |
797 | |
798 | sresult |= map->access; | |
799 | ||
0ec757df | 800 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
1da177e4 LT |
801 | switch (err2) { |
802 | case nfs_ok: | |
803 | result |= map->access; | |
804 | break; | |
805 | ||
806 | /* the following error codes just mean the access was not allowed, | |
807 | * rather than an error occurred */ | |
808 | case nfserr_rofs: | |
809 | case nfserr_acces: | |
810 | case nfserr_perm: | |
811 | /* simply don't "or" in the access bit. */ | |
812 | break; | |
813 | default: | |
814 | error = err2; | |
815 | goto out; | |
816 | } | |
817 | } | |
818 | } | |
819 | *access = result; | |
820 | if (supported) | |
821 | *supported = sresult; | |
822 | ||
823 | out: | |
824 | return error; | |
825 | } | |
1da177e4 | 826 | |
65294c1f | 827 | int nfsd_open_break_lease(struct inode *inode, int access) |
105f4622 BF |
828 | { |
829 | unsigned int mode; | |
1da177e4 | 830 | |
105f4622 BF |
831 | if (access & NFSD_MAY_NOT_BREAK_LEASE) |
832 | return 0; | |
833 | mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; | |
834 | return break_lease(inode, mode | O_NONBLOCK); | |
835 | } | |
1da177e4 LT |
836 | |
837 | /* | |
838 | * Open an existing file or directory. | |
999448a8 BS |
839 | * The may_flags argument indicates the type of open (read/write/lock) |
840 | * and additional flags. | |
1da177e4 LT |
841 | * N.B. After this call fhp needs an fh_put |
842 | */ | |
d59b3515 | 843 | static int |
65294c1f | 844 | __nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, |
999448a8 | 845 | int may_flags, struct file **filp) |
1da177e4 | 846 | { |
765927b2 | 847 | struct path path; |
1da177e4 | 848 | struct inode *inode; |
8519f994 | 849 | struct file *file; |
6264d69d | 850 | int flags = O_RDONLY|O_LARGEFILE; |
d59b3515 | 851 | int host_err = -EPERM; |
1da177e4 | 852 | |
765927b2 AV |
853 | path.mnt = fhp->fh_export->ex_path.mnt; |
854 | path.dentry = fhp->fh_dentry; | |
2b0143b5 | 855 | inode = d_inode(path.dentry); |
1da177e4 | 856 | |
999448a8 | 857 | if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) |
1da177e4 | 858 | goto out; |
1da177e4 LT |
859 | |
860 | if (!inode->i_fop) | |
861 | goto out; | |
862 | ||
999448a8 | 863 | host_err = nfsd_open_break_lease(inode, may_flags); |
6264d69d | 864 | if (host_err) /* NOMEM or WOULDBLOCK */ |
d59b3515 | 865 | goto out; |
1da177e4 | 866 | |
999448a8 BS |
867 | if (may_flags & NFSD_MAY_WRITE) { |
868 | if (may_flags & NFSD_MAY_READ) | |
9ecb6a08 BF |
869 | flags = O_RDWR|O_LARGEFILE; |
870 | else | |
871 | flags = O_WRONLY|O_LARGEFILE; | |
1da177e4 | 872 | } |
999448a8 | 873 | |
8519f994 KM |
874 | file = dentry_open(&path, flags, current_cred()); |
875 | if (IS_ERR(file)) { | |
876 | host_err = PTR_ERR(file); | |
d59b3515 | 877 | goto out; |
8519f994 KM |
878 | } |
879 | ||
6035a27b | 880 | host_err = ima_file_check(file, may_flags); |
8519f994 | 881 | if (host_err) { |
fd891454 | 882 | fput(file); |
d59b3515 | 883 | goto out; |
06effdbb BS |
884 | } |
885 | ||
8519f994 KM |
886 | if (may_flags & NFSD_MAY_64BIT_COOKIE) |
887 | file->f_mode |= FMODE_64BITHASH; | |
888 | else | |
889 | file->f_mode |= FMODE_32BITHASH; | |
890 | ||
891 | *filp = file; | |
1da177e4 | 892 | out: |
d59b3515 | 893 | return host_err; |
65294c1f JL |
894 | } |
895 | ||
896 | __be32 | |
897 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, | |
898 | int may_flags, struct file **filp) | |
899 | { | |
900 | __be32 err; | |
d59b3515 | 901 | int host_err; |
12bcbd40 | 902 | bool retried = false; |
65294c1f JL |
903 | |
904 | validate_process_creds(); | |
905 | /* | |
906 | * If we get here, then the client has already done an "open", | |
907 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE | |
908 | * in case a chmod has now revoked permission. | |
909 | * | |
910 | * Arguably we should also allow the owner override for | |
911 | * directories, but we never have and it doesn't seem to have | |
912 | * caused anyone a problem. If we were to change this, note | |
913 | * also that our filldir callbacks would need a variant of | |
914 | * lookup_one_len that doesn't check permissions. | |
915 | */ | |
916 | if (type == S_IFREG) | |
917 | may_flags |= NFSD_MAY_OWNER_OVERRIDE; | |
12bcbd40 | 918 | retry: |
65294c1f | 919 | err = fh_verify(rqstp, fhp, type, may_flags); |
12bcbd40 | 920 | if (!err) { |
d59b3515 TM |
921 | host_err = __nfsd_open(rqstp, fhp, type, may_flags, filp); |
922 | if (host_err == -EOPENSTALE && !retried) { | |
12bcbd40 JL |
923 | retried = true; |
924 | fh_put(fhp); | |
925 | goto retry; | |
926 | } | |
d59b3515 | 927 | err = nfserrno(host_err); |
12bcbd40 | 928 | } |
65294c1f JL |
929 | validate_process_creds(); |
930 | return err; | |
931 | } | |
932 | ||
f4d84c52 CL |
933 | /** |
934 | * nfsd_open_verified - Open a regular file for the filecache | |
935 | * @rqstp: RPC request | |
936 | * @fhp: NFS filehandle of the file to open | |
937 | * @may_flags: internal permission flags | |
938 | * @filp: OUT: open "struct file *" | |
939 | * | |
d59b3515 | 940 | * Returns zero on success, or a negative errno value. |
f4d84c52 | 941 | */ |
d59b3515 | 942 | int |
f4d84c52 CL |
943 | nfsd_open_verified(struct svc_rqst *rqstp, struct svc_fh *fhp, int may_flags, |
944 | struct file **filp) | |
65294c1f | 945 | { |
d59b3515 | 946 | int err; |
65294c1f JL |
947 | |
948 | validate_process_creds(); | |
f4d84c52 | 949 | err = __nfsd_open(rqstp, fhp, S_IFREG, may_flags, filp); |
e0e81739 | 950 | validate_process_creds(); |
1da177e4 LT |
951 | return err; |
952 | } | |
953 | ||
1da177e4 | 954 | /* |
cf8208d0 | 955 | * Grab and keep cached pages associated with a file in the svc_rqst |
dc97391e | 956 | * so that they can be passed to the network sendmsg routines |
cf8208d0 | 957 | * directly. They will be released after the sending has completed. |
0f516248 CL |
958 | * |
959 | * Return values: Number of bytes consumed, or -EIO if there are no | |
960 | * remaining pages in rqstp->rq_pages. | |
1da177e4 LT |
961 | */ |
962 | static int | |
cf8208d0 JA |
963 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
964 | struct splice_desc *sd) | |
1da177e4 | 965 | { |
cf8208d0 | 966 | struct svc_rqst *rqstp = sd->u.data; |
bfbfb618 AV |
967 | struct page *page = buf->page; // may be a compound one |
968 | unsigned offset = buf->offset; | |
ac8db824 | 969 | struct page *last_page; |
bfbfb618 | 970 | |
ac8db824 | 971 | last_page = page + (offset + sd->len - 1) / PAGE_SIZE; |
27c934dd JL |
972 | for (page += offset / PAGE_SIZE; page <= last_page; page++) { |
973 | /* | |
101df45e DH |
974 | * Skip page replacement when extending the contents of the |
975 | * current page. But note that we may get two zero_pages in a | |
976 | * row from shmem. | |
27c934dd | 977 | */ |
101df45e DH |
978 | if (page == *(rqstp->rq_next_page - 1) && |
979 | offset_in_page(rqstp->rq_res.page_base + | |
980 | rqstp->rq_res.page_len)) | |
27c934dd | 981 | continue; |
0f516248 CL |
982 | if (unlikely(!svc_rqst_replace_page(rqstp, page))) |
983 | return -EIO; | |
27c934dd | 984 | } |
bfbfb618 AV |
985 | if (rqstp->rq_res.page_len == 0) // first call |
986 | rqstp->rq_res.page_base = offset % PAGE_SIZE; | |
c7e0b781 | 987 | rqstp->rq_res.page_len += sd->len; |
c7e0b781 | 988 | return sd->len; |
1da177e4 LT |
989 | } |
990 | ||
cf8208d0 JA |
991 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
992 | struct splice_desc *sd) | |
993 | { | |
994 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
995 | } | |
996 | ||
83a63072 TM |
997 | static u32 nfsd_eof_on_read(struct file *file, loff_t offset, ssize_t len, |
998 | size_t expected) | |
999 | { | |
1000 | if (expected != 0 && len == 0) | |
1001 | return 1; | |
1002 | if (offset+len >= i_size_read(file_inode(file))) | |
1003 | return 1; | |
1004 | return 0; | |
1005 | } | |
1006 | ||
87c5942e CL |
1007 | static __be32 nfsd_finish_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1008 | struct file *file, loff_t offset, | |
83a63072 | 1009 | unsigned long *count, u32 *eof, ssize_t host_err) |
1da177e4 | 1010 | { |
6264d69d | 1011 | if (host_err >= 0) { |
20ad856e | 1012 | nfsd_stats_io_read_add(fhp->fh_export, host_err); |
83a63072 | 1013 | *eof = nfsd_eof_on_read(file, offset, host_err, *count); |
6264d69d | 1014 | *count = host_err; |
2a12a9d7 | 1015 | fsnotify_access(file); |
87c5942e | 1016 | trace_nfsd_read_io_done(rqstp, fhp, offset, *count); |
dc97618d | 1017 | return 0; |
87c5942e CL |
1018 | } else { |
1019 | trace_nfsd_read_err(rqstp, fhp, offset, host_err); | |
dc97618d | 1020 | return nfserrno(host_err); |
87c5942e | 1021 | } |
dc97618d BF |
1022 | } |
1023 | ||
703d7521 CL |
1024 | /** |
1025 | * nfsd_splice_read - Perform a VFS read using a splice pipe | |
1026 | * @rqstp: RPC transaction context | |
1027 | * @fhp: file handle of file to be read | |
1028 | * @file: opened struct file of file to be read | |
1029 | * @offset: starting byte offset | |
1030 | * @count: IN: requested number of bytes; OUT: number of bytes read | |
1031 | * @eof: OUT: set non-zero if operation reached the end of the file | |
1032 | * | |
1033 | * Returns nfs_ok on success, otherwise an nfserr stat value is | |
1034 | * returned. | |
1035 | */ | |
87c5942e | 1036 | __be32 nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
83a63072 TM |
1037 | struct file *file, loff_t offset, unsigned long *count, |
1038 | u32 *eof) | |
dc97618d BF |
1039 | { |
1040 | struct splice_desc sd = { | |
1041 | .len = 0, | |
1042 | .total_len = *count, | |
1043 | .pos = offset, | |
1044 | .u.data = rqstp, | |
1045 | }; | |
83a63072 | 1046 | ssize_t host_err; |
dc97618d | 1047 | |
87c5942e | 1048 | trace_nfsd_read_splice(rqstp, fhp, offset, *count); |
dc97618d | 1049 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); |
83a63072 | 1050 | return nfsd_finish_read(rqstp, fhp, file, offset, count, eof, host_err); |
dc97618d BF |
1051 | } |
1052 | ||
507df40e CL |
1053 | /** |
1054 | * nfsd_iter_read - Perform a VFS read using an iterator | |
1055 | * @rqstp: RPC transaction context | |
1056 | * @fhp: file handle of file to be read | |
1057 | * @file: opened struct file of file to be read | |
1058 | * @offset: starting byte offset | |
1059 | * @count: IN: requested number of bytes; OUT: number of bytes read | |
1060 | * @base: offset in first page of read buffer | |
1061 | * @eof: OUT: set non-zero if operation reached the end of the file | |
1062 | * | |
1063 | * Some filesystems or situations cannot use nfsd_splice_read. This | |
1064 | * function is the slightly less-performant fallback for those cases. | |
1065 | * | |
1066 | * Returns nfs_ok on success, otherwise an nfserr stat value is | |
1067 | * returned. | |
1068 | */ | |
1069 | __be32 nfsd_iter_read(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
1070 | struct file *file, loff_t offset, unsigned long *count, | |
1071 | unsigned int base, u32 *eof) | |
1072 | { | |
1073 | unsigned long v, total; | |
1074 | struct iov_iter iter; | |
1075 | loff_t ppos = offset; | |
1076 | struct page *page; | |
1077 | ssize_t host_err; | |
1078 | ||
1079 | v = 0; | |
1080 | total = *count; | |
1081 | while (total) { | |
1082 | page = *(rqstp->rq_next_page++); | |
1083 | rqstp->rq_vec[v].iov_base = page_address(page) + base; | |
1084 | rqstp->rq_vec[v].iov_len = min_t(size_t, total, PAGE_SIZE - base); | |
1085 | total -= rqstp->rq_vec[v].iov_len; | |
1086 | ++v; | |
1087 | base = 0; | |
1088 | } | |
1089 | WARN_ON_ONCE(v > ARRAY_SIZE(rqstp->rq_vec)); | |
1090 | ||
1091 | trace_nfsd_read_vector(rqstp, fhp, offset, *count); | |
1092 | iov_iter_kvec(&iter, ITER_DEST, rqstp->rq_vec, v, *count); | |
1093 | host_err = vfs_iter_read(file, &iter, &ppos, 0); | |
1094 | return nfsd_finish_read(rqstp, fhp, file, offset, count, eof, host_err); | |
1095 | } | |
1096 | ||
d911df7b BF |
1097 | /* |
1098 | * Gathered writes: If another process is currently writing to the file, | |
1099 | * there's a high chance this is another nfsd (triggered by a bulk write | |
1100 | * from a client's biod). Rather than syncing the file with each write | |
1101 | * request, we sleep for 10 msec. | |
1102 | * | |
1103 | * I don't know if this roughly approximates C. Juszak's idea of | |
1104 | * gathered writes, but it's a nice and simple solution (IMHO), and it | |
1105 | * seems to work:-) | |
1106 | * | |
1107 | * Note: we do this only in the NFSv2 case, since v3 and higher have a | |
1108 | * better tool (separate unstable writes and commits) for solving this | |
1109 | * problem. | |
1110 | */ | |
1111 | static int wait_for_concurrent_writes(struct file *file) | |
1112 | { | |
496ad9aa | 1113 | struct inode *inode = file_inode(file); |
d911df7b BF |
1114 | static ino_t last_ino; |
1115 | static dev_t last_dev; | |
1116 | int err = 0; | |
1117 | ||
1118 | if (atomic_read(&inode->i_writecount) > 1 | |
1119 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
1120 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); | |
1121 | msleep(10); | |
1122 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); | |
1123 | } | |
1124 | ||
1125 | if (inode->i_state & I_DIRTY) { | |
1126 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); | |
8018ab05 | 1127 | err = vfs_fsync(file, 0); |
d911df7b BF |
1128 | } |
1129 | last_ino = inode->i_ino; | |
1130 | last_dev = inode->i_sb->s_dev; | |
1131 | return err; | |
1132 | } | |
1133 | ||
af90f707 | 1134 | __be32 |
16f8f894 | 1135 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, |
1da177e4 | 1136 | loff_t offset, struct kvec *vec, int vlen, |
19e0663f TM |
1137 | unsigned long *cnt, int stable, |
1138 | __be32 *verf) | |
1da177e4 | 1139 | { |
fb7622c2 | 1140 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
16f8f894 | 1141 | struct file *file = nf->nf_file; |
01cbf385 | 1142 | struct super_block *sb = file_inode(file)->i_sb; |
1da177e4 | 1143 | struct svc_export *exp; |
73da852e | 1144 | struct iov_iter iter; |
555dbf1a | 1145 | errseq_t since; |
d890be15 | 1146 | __be32 nfserr; |
6264d69d | 1147 | int host_err; |
48e03bc5 | 1148 | int use_wgather; |
e49dbbf3 | 1149 | loff_t pos = offset; |
01cbf385 | 1150 | unsigned long exp_op_flags = 0; |
8658452e | 1151 | unsigned int pflags = current->flags; |
ddef7ed2 | 1152 | rwf_t flags = 0; |
01cbf385 | 1153 | bool restore_flags = false; |
8658452e | 1154 | |
d890be15 CL |
1155 | trace_nfsd_write_opened(rqstp, fhp, offset, *cnt); |
1156 | ||
01cbf385 TM |
1157 | if (sb->s_export_op) |
1158 | exp_op_flags = sb->s_export_op->flags; | |
1159 | ||
1160 | if (test_bit(RQ_LOCAL, &rqstp->rq_flags) && | |
1161 | !(exp_op_flags & EXPORT_OP_REMOTE_FS)) { | |
8658452e | 1162 | /* |
a37b0715 N |
1163 | * We want throttling in balance_dirty_pages() |
1164 | * and shrink_inactive_list() to only consider | |
1165 | * the backingdev we are writing to, so that nfs to | |
8658452e N |
1166 | * localhost doesn't cause nfsd to lock up due to all |
1167 | * the client's dirty pages or its congested queue. | |
1168 | */ | |
a37b0715 | 1169 | current->flags |= PF_LOCAL_THROTTLE; |
01cbf385 TM |
1170 | restore_flags = true; |
1171 | } | |
1da177e4 | 1172 | |
865d50b2 | 1173 | exp = fhp->fh_export; |
48e03bc5 | 1174 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
1da177e4 | 1175 | |
1da177e4 | 1176 | if (!EX_ISSYNC(exp)) |
54bbb7d2 | 1177 | stable = NFS_UNSTABLE; |
1da177e4 | 1178 | |
24368aad CH |
1179 | if (stable && !use_wgather) |
1180 | flags |= RWF_SYNC; | |
1181 | ||
de4eda9d | 1182 | iov_iter_kvec(&iter, ITER_SOURCE, vec, vlen, *cnt); |
555dbf1a | 1183 | since = READ_ONCE(file->f_wb_err); |
33388b3a | 1184 | if (verf) |
3988a578 | 1185 | nfsd_copy_write_verifier(verf, nn); |
fd9a2e1d | 1186 | file_start_write(file); |
33388b3a | 1187 | host_err = vfs_iter_write(file, &iter, &pos, flags); |
fd9a2e1d | 1188 | file_end_write(file); |
7bf94c6b | 1189 | if (host_err < 0) { |
1b2021bd | 1190 | commit_reset_write_verifier(nn, rqstp, host_err); |
e4636d53 | 1191 | goto out_nfserr; |
7bf94c6b | 1192 | } |
09a80f2a | 1193 | *cnt = host_err; |
20ad856e | 1194 | nfsd_stats_io_write_add(exp, *cnt); |
2a12a9d7 | 1195 | fsnotify_modify(file); |
555dbf1a TM |
1196 | host_err = filemap_check_wb_err(file->f_mapping, since); |
1197 | if (host_err < 0) | |
1198 | goto out_nfserr; | |
1da177e4 | 1199 | |
bbf2f098 | 1200 | if (stable && use_wgather) { |
24368aad | 1201 | host_err = wait_for_concurrent_writes(file); |
1b2021bd TM |
1202 | if (host_err < 0) |
1203 | commit_reset_write_verifier(nn, rqstp, host_err); | |
bbf2f098 | 1204 | } |
1da177e4 | 1205 | |
e4636d53 | 1206 | out_nfserr: |
d890be15 CL |
1207 | if (host_err >= 0) { |
1208 | trace_nfsd_write_io_done(rqstp, fhp, offset, *cnt); | |
1209 | nfserr = nfs_ok; | |
1210 | } else { | |
1211 | trace_nfsd_write_err(rqstp, fhp, offset, host_err); | |
1212 | nfserr = nfserrno(host_err); | |
1213 | } | |
01cbf385 | 1214 | if (restore_flags) |
a37b0715 | 1215 | current_restore_flags(pflags, PF_LOCAL_THROTTLE); |
d890be15 | 1216 | return nfserr; |
1da177e4 LT |
1217 | } |
1218 | ||
507df40e CL |
1219 | /** |
1220 | * nfsd_read - Read data from a file | |
1221 | * @rqstp: RPC transaction context | |
1222 | * @fhp: file handle of file to be read | |
1223 | * @offset: starting byte offset | |
1224 | * @count: IN: requested number of bytes; OUT: number of bytes read | |
1225 | * @eof: OUT: set non-zero if operation reached the end of the file | |
1226 | * | |
1227 | * The caller must verify that there is enough space in @rqstp.rq_res | |
1228 | * to perform this operation. | |
1229 | * | |
dc97618d | 1230 | * N.B. After this call fhp needs an fh_put |
507df40e CL |
1231 | * |
1232 | * Returns nfs_ok on success, otherwise an nfserr stat value is | |
1233 | * returned. | |
dc97618d BF |
1234 | */ |
1235 | __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
507df40e | 1236 | loff_t offset, unsigned long *count, u32 *eof) |
dc97618d | 1237 | { |
48cd7b51 | 1238 | struct nfsd_file *nf; |
dc97618d | 1239 | struct file *file; |
dc97618d BF |
1240 | __be32 err; |
1241 | ||
f394b62b | 1242 | trace_nfsd_read_start(rqstp, fhp, offset, *count); |
4d1ea845 | 1243 | err = nfsd_file_acquire_gc(rqstp, fhp, NFSD_MAY_READ, &nf); |
dc97618d BF |
1244 | if (err) |
1245 | return err; | |
1246 | ||
48cd7b51 | 1247 | file = nf->nf_file; |
a4058c5b | 1248 | if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags)) |
83a63072 | 1249 | err = nfsd_splice_read(rqstp, fhp, file, offset, count, eof); |
a4058c5b | 1250 | else |
507df40e | 1251 | err = nfsd_iter_read(rqstp, fhp, file, offset, count, 0, eof); |
6e8b50d1 | 1252 | |
48cd7b51 | 1253 | nfsd_file_put(nf); |
f394b62b | 1254 | trace_nfsd_read_done(rqstp, fhp, offset, *count); |
fa0a2126 BF |
1255 | return err; |
1256 | } | |
1257 | ||
1da177e4 LT |
1258 | /* |
1259 | * Write data to a file. | |
1260 | * The stable flag requests synchronous writes. | |
1261 | * N.B. After this call fhp needs an fh_put | |
1262 | */ | |
6264d69d | 1263 | __be32 |
52e380e0 | 1264 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t offset, |
19e0663f TM |
1265 | struct kvec *vec, int vlen, unsigned long *cnt, int stable, |
1266 | __be32 *verf) | |
1da177e4 | 1267 | { |
b4935239 JL |
1268 | struct nfsd_file *nf; |
1269 | __be32 err; | |
1da177e4 | 1270 | |
f394b62b | 1271 | trace_nfsd_write_start(rqstp, fhp, offset, *cnt); |
6e8b50d1 | 1272 | |
4d1ea845 | 1273 | err = nfsd_file_acquire_gc(rqstp, fhp, NFSD_MAY_WRITE, &nf); |
52e380e0 KM |
1274 | if (err) |
1275 | goto out; | |
1276 | ||
16f8f894 | 1277 | err = nfsd_vfs_write(rqstp, fhp, nf, offset, vec, |
19e0663f | 1278 | vlen, cnt, stable, verf); |
b4935239 | 1279 | nfsd_file_put(nf); |
1da177e4 | 1280 | out: |
f394b62b | 1281 | trace_nfsd_write_done(rqstp, fhp, offset, *cnt); |
1da177e4 LT |
1282 | return err; |
1283 | } | |
1284 | ||
3f965021 CL |
1285 | /** |
1286 | * nfsd_commit - Commit pending writes to stable storage | |
1287 | * @rqstp: RPC request being processed | |
1288 | * @fhp: NFS filehandle | |
c2528490 | 1289 | * @nf: target file |
3f965021 CL |
1290 | * @offset: raw offset from beginning of file |
1291 | * @count: raw count of bytes to sync | |
1292 | * @verf: filled in with the server's current write verifier | |
aa696a6f | 1293 | * |
3f965021 CL |
1294 | * Note: we guarantee that data that lies within the range specified |
1295 | * by the 'offset' and 'count' parameters will be synced. The server | |
1296 | * is permitted to sync data that lies outside this range at the | |
1297 | * same time. | |
1da177e4 LT |
1298 | * |
1299 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1300 | * data to the client, as locking happens lower down in the filesystem. | |
3f965021 CL |
1301 | * |
1302 | * Return values: | |
1303 | * An nfsstat value in network byte order. | |
1da177e4 | 1304 | */ |
6264d69d | 1305 | __be32 |
c2528490 CL |
1306 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, |
1307 | u64 offset, u32 count, __be32 *verf) | |
1da177e4 | 1308 | { |
c2528490 | 1309 | __be32 err = nfs_ok; |
3f965021 CL |
1310 | u64 maxbytes; |
1311 | loff_t start, end; | |
2c445a0e | 1312 | struct nfsd_net *nn; |
3f965021 CL |
1313 | |
1314 | /* | |
1315 | * Convert the client-provided (offset, count) range to a | |
1316 | * (start, end) range. If the client-provided range falls | |
1317 | * outside the maximum file size of the underlying FS, | |
1318 | * clamp the sync range appropriately. | |
1319 | */ | |
1320 | start = 0; | |
1321 | end = LLONG_MAX; | |
1322 | maxbytes = (u64)fhp->fh_dentry->d_sb->s_maxbytes; | |
1323 | if (offset < maxbytes) { | |
1324 | start = offset; | |
1325 | if (count && (offset + count - 1 < maxbytes)) | |
1326 | end = offset + count - 1; | |
1327 | } | |
1328 | ||
2c445a0e | 1329 | nn = net_generic(nf->nf_net, nfsd_net_id); |
1da177e4 | 1330 | if (EX_ISSYNC(fhp->fh_export)) { |
555dbf1a TM |
1331 | errseq_t since = READ_ONCE(nf->nf_file->f_wb_err); |
1332 | int err2; | |
aa696a6f | 1333 | |
3f965021 | 1334 | err2 = vfs_fsync_range(nf->nf_file, start, end, 0); |
bbf2f098 TM |
1335 | switch (err2) { |
1336 | case 0: | |
3988a578 | 1337 | nfsd_copy_write_verifier(verf, nn); |
555dbf1a TM |
1338 | err2 = filemap_check_wb_err(nf->nf_file->f_mapping, |
1339 | since); | |
8a9ffb8c | 1340 | err = nfserrno(err2); |
bbf2f098 TM |
1341 | break; |
1342 | case -EINVAL: | |
1da177e4 | 1343 | err = nfserr_notsupp; |
bbf2f098 TM |
1344 | break; |
1345 | default: | |
1b2021bd | 1346 | commit_reset_write_verifier(nn, rqstp, err2); |
8a9ffb8c | 1347 | err = nfserrno(err2); |
bbf2f098 | 1348 | } |
524ff1af | 1349 | } else |
3988a578 | 1350 | nfsd_copy_write_verifier(verf, nn); |
1da177e4 | 1351 | |
1da177e4 LT |
1352 | return err; |
1353 | } | |
1da177e4 | 1354 | |
5f46e950 CL |
1355 | /** |
1356 | * nfsd_create_setattr - Set a created file's attributes | |
1357 | * @rqstp: RPC transaction being executed | |
1358 | * @fhp: NFS filehandle of parent directory | |
1359 | * @resfhp: NFS filehandle of new object | |
7fe2a71d | 1360 | * @attrs: requested attributes of new object |
5f46e950 CL |
1361 | * |
1362 | * Returns nfs_ok on success, or an nfsstat in network byte order. | |
1363 | */ | |
1364 | __be32 | |
1365 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
7fe2a71d | 1366 | struct svc_fh *resfhp, struct nfsd_attrs *attrs) |
5c002b3b | 1367 | { |
7fe2a71d | 1368 | struct iattr *iap = attrs->na_iattr; |
5f46e950 CL |
1369 | __be32 status; |
1370 | ||
5c002b3b | 1371 | /* |
5f46e950 | 1372 | * Mode has already been set by file creation. |
5c002b3b BF |
1373 | */ |
1374 | iap->ia_valid &= ~ATTR_MODE; | |
5f46e950 | 1375 | |
5c002b3b BF |
1376 | /* |
1377 | * Setting uid/gid works only for root. Irix appears to | |
1378 | * send along the gid on create when it tries to implement | |
1379 | * setgid directories via NFS: | |
1380 | */ | |
6fab8779 | 1381 | if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) |
5c002b3b | 1382 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
5f46e950 CL |
1383 | |
1384 | /* | |
1385 | * Callers expect new file metadata to be committed even | |
1386 | * if the attributes have not changed. | |
1387 | */ | |
5c002b3b | 1388 | if (iap->ia_valid) |
7fe2a71d | 1389 | status = nfsd_setattr(rqstp, resfhp, attrs, 0, (time64_t)0); |
5f46e950 CL |
1390 | else |
1391 | status = nfserrno(commit_metadata(resfhp)); | |
1392 | ||
1393 | /* | |
1394 | * Transactional filesystems had a chance to commit changes | |
1395 | * for both parent and child simultaneously making the | |
1396 | * following commit_metadata a noop in many cases. | |
1397 | */ | |
1398 | if (!status) | |
1399 | status = nfserrno(commit_metadata(fhp)); | |
1400 | ||
1401 | /* | |
1402 | * Update the new filehandle to pick up the new attributes. | |
1403 | */ | |
1404 | if (!status) | |
1405 | status = fh_update(resfhp); | |
1406 | ||
1407 | return status; | |
5c002b3b BF |
1408 | } |
1409 | ||
4ac35c2f | 1410 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
1411 | * setting size to 0 may fail for some specific file systems by the permission | |
1412 | * checking which requires WRITE permission but the mode is 000. | |
1413 | * we ignore the resizing(to 0) on the just new created file, since the size is | |
1414 | * 0 after file created. | |
1415 | * | |
1416 | * call this only after vfs_create() is called. | |
1417 | * */ | |
1418 | static void | |
1419 | nfsd_check_ignore_resizing(struct iattr *iap) | |
1420 | { | |
1421 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) | |
1422 | iap->ia_valid &= ~ATTR_SIZE; | |
1423 | } | |
1424 | ||
b44061d0 | 1425 | /* The parent directory should already be locked: */ |
6264d69d | 1426 | __be32 |
b44061d0 | 1427 | nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, |
9558f930 | 1428 | struct nfsd_attrs *attrs, |
7fe2a71d | 1429 | int type, dev_t rdev, struct svc_fh *resfhp) |
1da177e4 | 1430 | { |
2b118859 | 1431 | struct dentry *dentry, *dchild; |
1da177e4 | 1432 | struct inode *dirp; |
7fe2a71d | 1433 | struct iattr *iap = attrs->na_iattr; |
6264d69d AV |
1434 | __be32 err; |
1435 | int host_err; | |
1da177e4 | 1436 | |
1da177e4 | 1437 | dentry = fhp->fh_dentry; |
2b0143b5 | 1438 | dirp = d_inode(dentry); |
1da177e4 | 1439 | |
b44061d0 | 1440 | dchild = dget(resfhp->fh_dentry); |
7eed34f1 OD |
1441 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE); |
1442 | if (err) | |
1443 | goto out; | |
1444 | ||
1da177e4 LT |
1445 | if (!(iap->ia_valid & ATTR_MODE)) |
1446 | iap->ia_mode = 0; | |
1447 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1448 | ||
22cf8419 BF |
1449 | if (!IS_POSIXACL(dirp)) |
1450 | iap->ia_mode &= ~current_umask(); | |
1451 | ||
088406bc | 1452 | err = 0; |
1da177e4 LT |
1453 | switch (type) { |
1454 | case S_IFREG: | |
abf08576 CB |
1455 | host_err = vfs_create(&nop_mnt_idmap, dirp, dchild, |
1456 | iap->ia_mode, true); | |
4ac35c2f | 1457 | if (!host_err) |
1458 | nfsd_check_ignore_resizing(iap); | |
1da177e4 LT |
1459 | break; |
1460 | case S_IFDIR: | |
abf08576 | 1461 | host_err = vfs_mkdir(&nop_mnt_idmap, dirp, dchild, iap->ia_mode); |
3819bb0d AV |
1462 | if (!host_err && unlikely(d_unhashed(dchild))) { |
1463 | struct dentry *d; | |
1464 | d = lookup_one_len(dchild->d_name.name, | |
1465 | dchild->d_parent, | |
1466 | dchild->d_name.len); | |
1467 | if (IS_ERR(d)) { | |
1468 | host_err = PTR_ERR(d); | |
1469 | break; | |
1470 | } | |
1471 | if (unlikely(d_is_negative(d))) { | |
1472 | dput(d); | |
1473 | err = nfserr_serverfault; | |
1474 | goto out; | |
1475 | } | |
1476 | dput(resfhp->fh_dentry); | |
1477 | resfhp->fh_dentry = dget(d); | |
1478 | err = fh_update(resfhp); | |
1479 | dput(dchild); | |
1480 | dchild = d; | |
1481 | if (err) | |
1482 | goto out; | |
1483 | } | |
1da177e4 LT |
1484 | break; |
1485 | case S_IFCHR: | |
1486 | case S_IFBLK: | |
1487 | case S_IFIFO: | |
1488 | case S_IFSOCK: | |
abf08576 | 1489 | host_err = vfs_mknod(&nop_mnt_idmap, dirp, dchild, |
6521f891 | 1490 | iap->ia_mode, rdev); |
1da177e4 | 1491 | break; |
71423274 BF |
1492 | default: |
1493 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", | |
1494 | type); | |
1495 | host_err = -EINVAL; | |
1da177e4 | 1496 | } |
4a55c101 | 1497 | if (host_err < 0) |
1da177e4 LT |
1498 | goto out_nfserr; |
1499 | ||
7fe2a71d | 1500 | err = nfsd_create_setattr(rqstp, fhp, resfhp, attrs); |
1da177e4 | 1501 | |
1da177e4 | 1502 | out: |
2b118859 | 1503 | dput(dchild); |
1da177e4 LT |
1504 | return err; |
1505 | ||
1506 | out_nfserr: | |
6264d69d | 1507 | err = nfserrno(host_err); |
1da177e4 LT |
1508 | goto out; |
1509 | } | |
1510 | ||
b44061d0 BF |
1511 | /* |
1512 | * Create a filesystem object (regular, directory, special). | |
1513 | * Note that the parent directory is left locked. | |
1514 | * | |
1515 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1516 | */ | |
1517 | __be32 | |
1518 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
7fe2a71d N |
1519 | char *fname, int flen, struct nfsd_attrs *attrs, |
1520 | int type, dev_t rdev, struct svc_fh *resfhp) | |
b44061d0 BF |
1521 | { |
1522 | struct dentry *dentry, *dchild = NULL; | |
b44061d0 BF |
1523 | __be32 err; |
1524 | int host_err; | |
1525 | ||
1526 | if (isdotent(fname, flen)) | |
1527 | return nfserr_exist; | |
1528 | ||
fa08139d | 1529 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP); |
b44061d0 BF |
1530 | if (err) |
1531 | return err; | |
1532 | ||
1533 | dentry = fhp->fh_dentry; | |
b44061d0 BF |
1534 | |
1535 | host_err = fh_want_write(fhp); | |
1536 | if (host_err) | |
1537 | return nfserrno(host_err); | |
1538 | ||
debf16f0 | 1539 | inode_lock_nested(dentry->d_inode, I_MUTEX_PARENT); |
b44061d0 BF |
1540 | dchild = lookup_one_len(fname, dentry, flen); |
1541 | host_err = PTR_ERR(dchild); | |
927bfc56 N |
1542 | if (IS_ERR(dchild)) { |
1543 | err = nfserrno(host_err); | |
1544 | goto out_unlock; | |
1545 | } | |
b44061d0 | 1546 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
502aa0a5 JB |
1547 | /* |
1548 | * We unconditionally drop our ref to dchild as fh_compose will have | |
1549 | * already grabbed its own ref for it. | |
1550 | */ | |
1551 | dput(dchild); | |
1552 | if (err) | |
927bfc56 | 1553 | goto out_unlock; |
a332018a JL |
1554 | err = fh_fill_pre_attrs(fhp); |
1555 | if (err != nfs_ok) | |
1556 | goto out_unlock; | |
9558f930 | 1557 | err = nfsd_create_locked(rqstp, fhp, attrs, type, rdev, resfhp); |
debf16f0 | 1558 | fh_fill_post_attrs(fhp); |
927bfc56 | 1559 | out_unlock: |
debf16f0 | 1560 | inode_unlock(dentry->d_inode); |
927bfc56 | 1561 | return err; |
b44061d0 BF |
1562 | } |
1563 | ||
1da177e4 LT |
1564 | /* |
1565 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1566 | * fits into the buffer. On return, it contains the true length. | |
1567 | * N.B. After this call fhp needs an fh_put | |
1568 | */ | |
6264d69d | 1569 | __be32 |
1da177e4 LT |
1570 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1571 | { | |
6264d69d | 1572 | __be32 err; |
4d7edbc3 | 1573 | const char *link; |
68ac1234 | 1574 | struct path path; |
4d7edbc3 AV |
1575 | DEFINE_DELAYED_CALL(done); |
1576 | int len; | |
1da177e4 | 1577 | |
8837abca | 1578 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
4d7edbc3 AV |
1579 | if (unlikely(err)) |
1580 | return err; | |
1da177e4 | 1581 | |
68ac1234 AV |
1582 | path.mnt = fhp->fh_export->ex_path.mnt; |
1583 | path.dentry = fhp->fh_dentry; | |
1da177e4 | 1584 | |
4d7edbc3 AV |
1585 | if (unlikely(!d_is_symlink(path.dentry))) |
1586 | return nfserr_inval; | |
1da177e4 | 1587 | |
68ac1234 | 1588 | touch_atime(&path); |
1da177e4 | 1589 | |
4d7edbc3 AV |
1590 | link = vfs_get_link(path.dentry, &done); |
1591 | if (IS_ERR(link)) | |
1592 | return nfserrno(PTR_ERR(link)); | |
1da177e4 | 1593 | |
4d7edbc3 AV |
1594 | len = strlen(link); |
1595 | if (len < *lenp) | |
1596 | *lenp = len; | |
1597 | memcpy(buf, link, *lenp); | |
1598 | do_delayed_call(&done); | |
1599 | return 0; | |
1da177e4 LT |
1600 | } |
1601 | ||
93adc1e3 N |
1602 | /** |
1603 | * nfsd_symlink - Create a symlink and look up its inode | |
1604 | * @rqstp: RPC transaction being executed | |
1605 | * @fhp: NFS filehandle of parent directory | |
1606 | * @fname: filename of the new symlink | |
1607 | * @flen: length of @fname | |
1608 | * @path: content of the new symlink (NUL-terminated) | |
1609 | * @attrs: requested attributes of new object | |
1610 | * @resfhp: NFS filehandle of new object | |
1611 | * | |
1da177e4 | 1612 | * N.B. After this call _both_ fhp and resfhp need an fh_put |
93adc1e3 N |
1613 | * |
1614 | * Returns nfs_ok on success, or an nfsstat in network byte order. | |
1da177e4 | 1615 | */ |
6264d69d | 1616 | __be32 |
1da177e4 | 1617 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
93adc1e3 N |
1618 | char *fname, int flen, |
1619 | char *path, struct nfsd_attrs *attrs, | |
1620 | struct svc_fh *resfhp) | |
1da177e4 LT |
1621 | { |
1622 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1623 | __be32 err, cerr; |
1624 | int host_err; | |
1da177e4 LT |
1625 | |
1626 | err = nfserr_noent; | |
52ee0433 | 1627 | if (!flen || path[0] == '\0') |
1da177e4 LT |
1628 | goto out; |
1629 | err = nfserr_exist; | |
1630 | if (isdotent(fname, flen)) | |
1631 | goto out; | |
1632 | ||
8837abca | 1633 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1634 | if (err) |
1635 | goto out; | |
4a55c101 JK |
1636 | |
1637 | host_err = fh_want_write(fhp); | |
927bfc56 N |
1638 | if (host_err) { |
1639 | err = nfserrno(host_err); | |
1640 | goto out; | |
1641 | } | |
4a55c101 | 1642 | |
1da177e4 | 1643 | dentry = fhp->fh_dentry; |
debf16f0 | 1644 | inode_lock_nested(dentry->d_inode, I_MUTEX_PARENT); |
1da177e4 | 1645 | dnew = lookup_one_len(fname, dentry, flen); |
927bfc56 N |
1646 | if (IS_ERR(dnew)) { |
1647 | err = nfserrno(PTR_ERR(dnew)); | |
debf16f0 | 1648 | inode_unlock(dentry->d_inode); |
927bfc56 N |
1649 | goto out_drop_write; |
1650 | } | |
a332018a JL |
1651 | err = fh_fill_pre_attrs(fhp); |
1652 | if (err != nfs_ok) | |
1653 | goto out_unlock; | |
abf08576 | 1654 | host_err = vfs_symlink(&nop_mnt_idmap, d_inode(dentry), dnew, path); |
6264d69d | 1655 | err = nfserrno(host_err); |
93adc1e3 N |
1656 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
1657 | if (!err) | |
1658 | nfsd_create_setattr(rqstp, fhp, resfhp, attrs); | |
debf16f0 | 1659 | fh_fill_post_attrs(fhp); |
a332018a | 1660 | out_unlock: |
debf16f0 | 1661 | inode_unlock(dentry->d_inode); |
f501912a BM |
1662 | if (!err) |
1663 | err = nfserrno(commit_metadata(fhp)); | |
1da177e4 LT |
1664 | dput(dnew); |
1665 | if (err==0) err = cerr; | |
927bfc56 N |
1666 | out_drop_write: |
1667 | fh_drop_write(fhp); | |
1da177e4 LT |
1668 | out: |
1669 | return err; | |
1da177e4 LT |
1670 | } |
1671 | ||
1672 | /* | |
1673 | * Create a hardlink | |
1674 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1675 | */ | |
6264d69d | 1676 | __be32 |
1da177e4 LT |
1677 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1678 | char *name, int len, struct svc_fh *tfhp) | |
1679 | { | |
1680 | struct dentry *ddir, *dnew, *dold; | |
55b13354 | 1681 | struct inode *dirp; |
6264d69d AV |
1682 | __be32 err; |
1683 | int host_err; | |
1da177e4 | 1684 | |
8837abca | 1685 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1686 | if (err) |
1687 | goto out; | |
7d818a7b | 1688 | err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
1689 | if (err) |
1690 | goto out; | |
7d818a7b | 1691 | err = nfserr_isdir; |
e36cb0b8 | 1692 | if (d_is_dir(tfhp->fh_dentry)) |
7d818a7b | 1693 | goto out; |
1da177e4 LT |
1694 | err = nfserr_perm; |
1695 | if (!len) | |
1696 | goto out; | |
1697 | err = nfserr_exist; | |
1698 | if (isdotent(name, len)) | |
1699 | goto out; | |
1700 | ||
4a55c101 JK |
1701 | host_err = fh_want_write(tfhp); |
1702 | if (host_err) { | |
1703 | err = nfserrno(host_err); | |
1704 | goto out; | |
1705 | } | |
1706 | ||
1da177e4 | 1707 | ddir = ffhp->fh_dentry; |
2b0143b5 | 1708 | dirp = d_inode(ddir); |
debf16f0 | 1709 | inode_lock_nested(dirp, I_MUTEX_PARENT); |
1da177e4 LT |
1710 | |
1711 | dnew = lookup_one_len(name, ddir, len); | |
e18bcb33 N |
1712 | if (IS_ERR(dnew)) { |
1713 | err = nfserrno(PTR_ERR(dnew)); | |
1714 | goto out_unlock; | |
1715 | } | |
1da177e4 LT |
1716 | |
1717 | dold = tfhp->fh_dentry; | |
1da177e4 | 1718 | |
4795bb37 | 1719 | err = nfserr_noent; |
2b0143b5 | 1720 | if (d_really_is_negative(dold)) |
4a55c101 | 1721 | goto out_dput; |
a332018a JL |
1722 | err = fh_fill_pre_attrs(ffhp); |
1723 | if (err != nfs_ok) | |
1724 | goto out_dput; | |
abf08576 | 1725 | host_err = vfs_link(dold, &nop_mnt_idmap, dirp, dnew, NULL); |
debf16f0 N |
1726 | fh_fill_post_attrs(ffhp); |
1727 | inode_unlock(dirp); | |
6264d69d | 1728 | if (!host_err) { |
f501912a BM |
1729 | err = nfserrno(commit_metadata(ffhp)); |
1730 | if (!err) | |
1731 | err = nfserrno(commit_metadata(tfhp)); | |
1da177e4 | 1732 | } else { |
6264d69d | 1733 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1734 | err = nfserr_acces; |
1735 | else | |
6264d69d | 1736 | err = nfserrno(host_err); |
1da177e4 | 1737 | } |
1da177e4 | 1738 | dput(dnew); |
e18bcb33 | 1739 | out_drop_write: |
4a55c101 | 1740 | fh_drop_write(tfhp); |
1da177e4 LT |
1741 | out: |
1742 | return err; | |
1743 | ||
e18bcb33 N |
1744 | out_dput: |
1745 | dput(dnew); | |
1746 | out_unlock: | |
debf16f0 | 1747 | inode_unlock(dirp); |
e18bcb33 | 1748 | goto out_drop_write; |
1da177e4 LT |
1749 | } |
1750 | ||
7775ec57 JL |
1751 | static void |
1752 | nfsd_close_cached_files(struct dentry *dentry) | |
1753 | { | |
1754 | struct inode *inode = d_inode(dentry); | |
1755 | ||
1756 | if (inode && S_ISREG(inode->i_mode)) | |
1757 | nfsd_file_close_inode_sync(inode); | |
1758 | } | |
1759 | ||
1760 | static bool | |
1761 | nfsd_has_cached_files(struct dentry *dentry) | |
1762 | { | |
1763 | bool ret = false; | |
1764 | struct inode *inode = d_inode(dentry); | |
1765 | ||
1766 | if (inode && S_ISREG(inode->i_mode)) | |
1767 | ret = nfsd_file_is_cached(inode); | |
1768 | return ret; | |
1769 | } | |
1770 | ||
1da177e4 LT |
1771 | /* |
1772 | * Rename a file | |
1773 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1774 | */ | |
6264d69d | 1775 | __be32 |
1da177e4 LT |
1776 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1777 | struct svc_fh *tfhp, char *tname, int tlen) | |
1778 | { | |
1779 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1780 | struct inode *fdir, *tdir; | |
6264d69d AV |
1781 | __be32 err; |
1782 | int host_err; | |
7f84b488 | 1783 | bool close_cached = false; |
1da177e4 | 1784 | |
8837abca | 1785 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1786 | if (err) |
1787 | goto out; | |
8837abca | 1788 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1789 | if (err) |
1790 | goto out; | |
1791 | ||
1792 | fdentry = ffhp->fh_dentry; | |
2b0143b5 | 1793 | fdir = d_inode(fdentry); |
1da177e4 LT |
1794 | |
1795 | tdentry = tfhp->fh_dentry; | |
2b0143b5 | 1796 | tdir = d_inode(tdentry); |
1da177e4 | 1797 | |
1da177e4 LT |
1798 | err = nfserr_perm; |
1799 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1800 | goto out; | |
1801 | ||
1aee9158 AV |
1802 | err = (rqstp->rq_vers == 2) ? nfserr_acces : nfserr_xdev; |
1803 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) | |
1804 | goto out; | |
1805 | if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) | |
1806 | goto out; | |
1807 | ||
7775ec57 | 1808 | retry: |
4a55c101 JK |
1809 | host_err = fh_want_write(ffhp); |
1810 | if (host_err) { | |
1811 | err = nfserrno(host_err); | |
1812 | goto out; | |
1813 | } | |
1814 | ||
1da177e4 | 1815 | trap = lock_rename(tdentry, fdentry); |
a332018a JL |
1816 | err = fh_fill_pre_attrs(ffhp); |
1817 | if (err != nfs_ok) | |
1818 | goto out_unlock; | |
1819 | err = fh_fill_pre_attrs(tfhp); | |
1820 | if (err != nfs_ok) | |
1821 | goto out_unlock; | |
1da177e4 LT |
1822 | |
1823 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1824 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1825 | if (IS_ERR(odentry)) |
1826 | goto out_nfserr; | |
1827 | ||
6264d69d | 1828 | host_err = -ENOENT; |
2b0143b5 | 1829 | if (d_really_is_negative(odentry)) |
1da177e4 | 1830 | goto out_dput_old; |
6264d69d | 1831 | host_err = -EINVAL; |
1da177e4 LT |
1832 | if (odentry == trap) |
1833 | goto out_dput_old; | |
1834 | ||
1835 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1836 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1837 | if (IS_ERR(ndentry)) |
1838 | goto out_dput_old; | |
6264d69d | 1839 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1840 | if (ndentry == trap) |
1841 | goto out_dput_new; | |
1842 | ||
7f84b488 JL |
1843 | if ((ndentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK) && |
1844 | nfsd_has_cached_files(ndentry)) { | |
1845 | close_cached = true; | |
7775ec57 JL |
1846 | goto out_dput_old; |
1847 | } else { | |
9fe61450 | 1848 | struct renamedata rd = { |
abf08576 | 1849 | .old_mnt_idmap = &nop_mnt_idmap, |
9fe61450 CB |
1850 | .old_dir = fdir, |
1851 | .old_dentry = odentry, | |
abf08576 | 1852 | .new_mnt_idmap = &nop_mnt_idmap, |
9fe61450 CB |
1853 | .new_dir = tdir, |
1854 | .new_dentry = ndentry, | |
1855 | }; | |
68c522af CL |
1856 | int retries; |
1857 | ||
1858 | for (retries = 1;;) { | |
1859 | host_err = vfs_rename(&rd); | |
1860 | if (host_err != -EAGAIN || !retries--) | |
1861 | break; | |
1862 | if (!nfsd_wait_for_delegreturn(rqstp, d_inode(odentry))) | |
1863 | break; | |
1864 | } | |
7775ec57 JL |
1865 | if (!host_err) { |
1866 | host_err = commit_metadata(tfhp); | |
1867 | if (!host_err) | |
1868 | host_err = commit_metadata(ffhp); | |
1869 | } | |
1da177e4 | 1870 | } |
1da177e4 LT |
1871 | out_dput_new: |
1872 | dput(ndentry); | |
1873 | out_dput_old: | |
1874 | dput(odentry); | |
1875 | out_nfserr: | |
6264d69d | 1876 | err = nfserrno(host_err); |
dd8dd403 | 1877 | |
7f84b488 | 1878 | if (!close_cached) { |
fcb5e3fa CL |
1879 | fh_fill_post_attrs(ffhp); |
1880 | fh_fill_post_attrs(tfhp); | |
7775ec57 | 1881 | } |
a332018a | 1882 | out_unlock: |
1da177e4 | 1883 | unlock_rename(tdentry, fdentry); |
4a55c101 | 1884 | fh_drop_write(ffhp); |
1da177e4 | 1885 | |
7775ec57 JL |
1886 | /* |
1887 | * If the target dentry has cached open files, then we need to try to | |
1888 | * close them prior to doing the rename. Flushing delayed fput | |
1889 | * shouldn't be done with locks held however, so we delay it until this | |
1890 | * point and then reattempt the whole shebang. | |
1891 | */ | |
7f84b488 JL |
1892 | if (close_cached) { |
1893 | close_cached = false; | |
7775ec57 JL |
1894 | nfsd_close_cached_files(ndentry); |
1895 | dput(ndentry); | |
1896 | goto retry; | |
1897 | } | |
1da177e4 LT |
1898 | out: |
1899 | return err; | |
1900 | } | |
1901 | ||
1902 | /* | |
1903 | * Unlink a file or directory | |
1904 | * N.B. After this call fhp needs an fh_put | |
1905 | */ | |
6264d69d | 1906 | __be32 |
1da177e4 LT |
1907 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1908 | char *fname, int flen) | |
1909 | { | |
1910 | struct dentry *dentry, *rdentry; | |
1911 | struct inode *dirp; | |
e5d74a2d | 1912 | struct inode *rinode; |
6264d69d AV |
1913 | __be32 err; |
1914 | int host_err; | |
1da177e4 LT |
1915 | |
1916 | err = nfserr_acces; | |
1917 | if (!flen || isdotent(fname, flen)) | |
1918 | goto out; | |
8837abca | 1919 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1920 | if (err) |
1921 | goto out; | |
1922 | ||
4a55c101 JK |
1923 | host_err = fh_want_write(fhp); |
1924 | if (host_err) | |
1925 | goto out_nfserr; | |
1926 | ||
1da177e4 | 1927 | dentry = fhp->fh_dentry; |
2b0143b5 | 1928 | dirp = d_inode(dentry); |
debf16f0 | 1929 | inode_lock_nested(dirp, I_MUTEX_PARENT); |
1da177e4 LT |
1930 | |
1931 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1932 | host_err = PTR_ERR(rdentry); |
1da177e4 | 1933 | if (IS_ERR(rdentry)) |
b677c0c6 | 1934 | goto out_unlock; |
1da177e4 | 1935 | |
2b0143b5 | 1936 | if (d_really_is_negative(rdentry)) { |
1da177e4 | 1937 | dput(rdentry); |
0ca0c9d7 | 1938 | host_err = -ENOENT; |
b677c0c6 | 1939 | goto out_unlock; |
1da177e4 | 1940 | } |
e5d74a2d | 1941 | rinode = d_inode(rdentry); |
a332018a JL |
1942 | err = fh_fill_pre_attrs(fhp); |
1943 | if (err != nfs_ok) | |
1944 | goto out_unlock; | |
1da177e4 | 1945 | |
a332018a | 1946 | ihold(rinode); |
1da177e4 | 1947 | if (!type) |
2b0143b5 | 1948 | type = d_inode(rdentry)->i_mode & S_IFMT; |
1da177e4 | 1949 | |
7775ec57 | 1950 | if (type != S_IFDIR) { |
5f5f8b6d CL |
1951 | int retries; |
1952 | ||
7f84b488 JL |
1953 | if (rdentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK) |
1954 | nfsd_close_cached_files(rdentry); | |
5f5f8b6d CL |
1955 | |
1956 | for (retries = 1;;) { | |
abf08576 | 1957 | host_err = vfs_unlink(&nop_mnt_idmap, dirp, rdentry, NULL); |
5f5f8b6d CL |
1958 | if (host_err != -EAGAIN || !retries--) |
1959 | break; | |
1960 | if (!nfsd_wait_for_delegreturn(rqstp, rinode)) | |
1961 | break; | |
1962 | } | |
7775ec57 | 1963 | } else { |
abf08576 | 1964 | host_err = vfs_rmdir(&nop_mnt_idmap, dirp, rdentry); |
7775ec57 | 1965 | } |
debf16f0 | 1966 | fh_fill_post_attrs(fhp); |
7775ec57 | 1967 | |
debf16f0 | 1968 | inode_unlock(dirp); |
f501912a BM |
1969 | if (!host_err) |
1970 | host_err = commit_metadata(fhp); | |
541ce98c | 1971 | dput(rdentry); |
e5d74a2d | 1972 | iput(rinode); /* truncate the inode here */ |
541ce98c | 1973 | |
0ca0c9d7 BF |
1974 | out_drop_write: |
1975 | fh_drop_write(fhp); | |
1da177e4 | 1976 | out_nfserr: |
466e16f0 N |
1977 | if (host_err == -EBUSY) { |
1978 | /* name is mounted-on. There is no perfect | |
1979 | * error status. | |
1980 | */ | |
1981 | if (nfsd_v4client(rqstp)) | |
1982 | err = nfserr_file_open; | |
1983 | else | |
1984 | err = nfserr_acces; | |
1985 | } else { | |
1986 | err = nfserrno(host_err); | |
1987 | } | |
f193fbab YT |
1988 | out: |
1989 | return err; | |
b677c0c6 | 1990 | out_unlock: |
debf16f0 | 1991 | inode_unlock(dirp); |
b677c0c6 | 1992 | goto out_drop_write; |
1da177e4 LT |
1993 | } |
1994 | ||
14f7dd63 DW |
1995 | /* |
1996 | * We do this buffering because we must not call back into the file | |
1997 | * system's ->lookup() method from the filldir callback. That may well | |
1998 | * deadlock a number of file systems. | |
1999 | * | |
2000 | * This is based heavily on the implementation of same in XFS. | |
2001 | */ | |
2002 | struct buffered_dirent { | |
2003 | u64 ino; | |
2004 | loff_t offset; | |
2005 | int namlen; | |
2006 | unsigned int d_type; | |
2007 | char name[]; | |
2008 | }; | |
2009 | ||
2010 | struct readdir_data { | |
5c0ba4e0 | 2011 | struct dir_context ctx; |
14f7dd63 DW |
2012 | char *dirent; |
2013 | size_t used; | |
53c9c5c0 | 2014 | int full; |
14f7dd63 DW |
2015 | }; |
2016 | ||
25885a35 | 2017 | static bool nfsd_buffered_filldir(struct dir_context *ctx, const char *name, |
ac7576f4 MS |
2018 | int namlen, loff_t offset, u64 ino, |
2019 | unsigned int d_type) | |
14f7dd63 | 2020 | { |
ac7576f4 MS |
2021 | struct readdir_data *buf = |
2022 | container_of(ctx, struct readdir_data, ctx); | |
14f7dd63 DW |
2023 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); |
2024 | unsigned int reclen; | |
2025 | ||
2026 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); | |
53c9c5c0 AV |
2027 | if (buf->used + reclen > PAGE_SIZE) { |
2028 | buf->full = 1; | |
25885a35 | 2029 | return false; |
53c9c5c0 | 2030 | } |
14f7dd63 DW |
2031 | |
2032 | de->namlen = namlen; | |
2033 | de->offset = offset; | |
2034 | de->ino = ino; | |
2035 | de->d_type = d_type; | |
2036 | memcpy(de->name, name, namlen); | |
2037 | buf->used += reclen; | |
2038 | ||
25885a35 | 2039 | return true; |
14f7dd63 DW |
2040 | } |
2041 | ||
6019ce07 CL |
2042 | static __be32 nfsd_buffered_readdir(struct file *file, struct svc_fh *fhp, |
2043 | nfsd_filldir_t func, struct readdir_cd *cdp, | |
2044 | loff_t *offsetp) | |
2628b766 | 2045 | { |
14f7dd63 | 2046 | struct buffered_dirent *de; |
2628b766 | 2047 | int host_err; |
14f7dd63 DW |
2048 | int size; |
2049 | loff_t offset; | |
ac6614b7 AV |
2050 | struct readdir_data buf = { |
2051 | .ctx.actor = nfsd_buffered_filldir, | |
2052 | .dirent = (void *)__get_free_page(GFP_KERNEL) | |
2053 | }; | |
2628b766 | 2054 | |
14f7dd63 | 2055 | if (!buf.dirent) |
2f9092e1 | 2056 | return nfserrno(-ENOMEM); |
14f7dd63 DW |
2057 | |
2058 | offset = *offsetp; | |
2628b766 | 2059 | |
14f7dd63 DW |
2060 | while (1) { |
2061 | unsigned int reclen; | |
2062 | ||
b726e923 | 2063 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
14f7dd63 | 2064 | buf.used = 0; |
53c9c5c0 | 2065 | buf.full = 0; |
14f7dd63 | 2066 | |
5c0ba4e0 | 2067 | host_err = iterate_dir(file, &buf.ctx); |
53c9c5c0 AV |
2068 | if (buf.full) |
2069 | host_err = 0; | |
2070 | ||
2071 | if (host_err < 0) | |
14f7dd63 DW |
2072 | break; |
2073 | ||
2074 | size = buf.used; | |
2075 | ||
2076 | if (!size) | |
2077 | break; | |
2078 | ||
14f7dd63 DW |
2079 | de = (struct buffered_dirent *)buf.dirent; |
2080 | while (size > 0) { | |
2081 | offset = de->offset; | |
2082 | ||
2083 | if (func(cdp, de->name, de->namlen, de->offset, | |
2084 | de->ino, de->d_type)) | |
2f9092e1 | 2085 | break; |
14f7dd63 DW |
2086 | |
2087 | if (cdp->err != nfs_ok) | |
2f9092e1 | 2088 | break; |
14f7dd63 | 2089 | |
6019ce07 CL |
2090 | trace_nfsd_dirent(fhp, de->ino, de->name, de->namlen); |
2091 | ||
14f7dd63 DW |
2092 | reclen = ALIGN(sizeof(*de) + de->namlen, |
2093 | sizeof(u64)); | |
2094 | size -= reclen; | |
2095 | de = (struct buffered_dirent *)((char *)de + reclen); | |
2096 | } | |
2f9092e1 DW |
2097 | if (size > 0) /* We bailed out early */ |
2098 | break; | |
2099 | ||
c002a6c7 | 2100 | offset = vfs_llseek(file, 0, SEEK_CUR); |
14f7dd63 DW |
2101 | } |
2102 | ||
14f7dd63 | 2103 | free_page((unsigned long)(buf.dirent)); |
2628b766 DW |
2104 | |
2105 | if (host_err) | |
2106 | return nfserrno(host_err); | |
14f7dd63 DW |
2107 | |
2108 | *offsetp = offset; | |
2109 | return cdp->err; | |
2628b766 DW |
2110 | } |
2111 | ||
1da177e4 LT |
2112 | /* |
2113 | * Read entries from a directory. | |
2114 | * The NFSv3/4 verifier we ignore for now. | |
2115 | */ | |
6264d69d | 2116 | __be32 |
1da177e4 | 2117 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
ac7576f4 | 2118 | struct readdir_cd *cdp, nfsd_filldir_t func) |
1da177e4 | 2119 | { |
6264d69d | 2120 | __be32 err; |
1da177e4 LT |
2121 | struct file *file; |
2122 | loff_t offset = *offsetp; | |
06effdbb BS |
2123 | int may_flags = NFSD_MAY_READ; |
2124 | ||
2125 | /* NFSv2 only supports 32 bit cookies */ | |
2126 | if (rqstp->rq_vers > 2) | |
2127 | may_flags |= NFSD_MAY_64BIT_COOKIE; | |
1da177e4 | 2128 | |
06effdbb | 2129 | err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); |
1da177e4 LT |
2130 | if (err) |
2131 | goto out; | |
2132 | ||
b108fe6b | 2133 | offset = vfs_llseek(file, offset, SEEK_SET); |
1da177e4 LT |
2134 | if (offset < 0) { |
2135 | err = nfserrno((int)offset); | |
2136 | goto out_close; | |
2137 | } | |
2138 | ||
6019ce07 | 2139 | err = nfsd_buffered_readdir(file, fhp, func, cdp, offsetp); |
1da177e4 LT |
2140 | |
2141 | if (err == nfserr_eof || err == nfserr_toosmall) | |
2142 | err = nfs_ok; /* can still be found in ->err */ | |
2143 | out_close: | |
fd891454 | 2144 | fput(file); |
1da177e4 LT |
2145 | out: |
2146 | return err; | |
2147 | } | |
2148 | ||
2149 | /* | |
2150 | * Get file system stats | |
2151 | * N.B. After this call fhp needs an fh_put | |
2152 | */ | |
6264d69d | 2153 | __be32 |
04716e66 | 2154 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) |
1da177e4 | 2155 | { |
ebabe9a9 CH |
2156 | __be32 err; |
2157 | ||
2158 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); | |
f6360efb TI |
2159 | if (!err) { |
2160 | struct path path = { | |
2161 | .mnt = fhp->fh_export->ex_path.mnt, | |
2162 | .dentry = fhp->fh_dentry, | |
2163 | }; | |
2164 | if (vfs_statfs(&path, stat)) | |
2165 | err = nfserr_io; | |
2166 | } | |
1da177e4 LT |
2167 | return err; |
2168 | } | |
2169 | ||
c7d51402 | 2170 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
e22841c6 | 2171 | { |
c7d51402 | 2172 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
e22841c6 BF |
2173 | } |
2174 | ||
32119446 FL |
2175 | #ifdef CONFIG_NFSD_V4 |
2176 | /* | |
2177 | * Helper function to translate error numbers. In the case of xattr operations, | |
2178 | * some error codes need to be translated outside of the standard translations. | |
2179 | * | |
2180 | * ENODATA needs to be translated to nfserr_noxattr. | |
2181 | * E2BIG to nfserr_xattr2big. | |
2182 | * | |
2183 | * Additionally, vfs_listxattr can return -ERANGE. This means that the | |
2184 | * file has too many extended attributes to retrieve inside an | |
2185 | * XATTR_LIST_MAX sized buffer. This is a bug in the xattr implementation: | |
2186 | * filesystems will allow the adding of extended attributes until they hit | |
2187 | * their own internal limit. This limit may be larger than XATTR_LIST_MAX. | |
2188 | * So, at that point, the attributes are present and valid, but can't | |
2189 | * be retrieved using listxattr, since the upper level xattr code enforces | |
2190 | * the XATTR_LIST_MAX limit. | |
2191 | * | |
2192 | * This bug means that we need to deal with listxattr returning -ERANGE. The | |
2193 | * best mapping is to return TOOSMALL. | |
2194 | */ | |
2195 | static __be32 | |
2196 | nfsd_xattr_errno(int err) | |
2197 | { | |
2198 | switch (err) { | |
2199 | case -ENODATA: | |
2200 | return nfserr_noxattr; | |
2201 | case -E2BIG: | |
2202 | return nfserr_xattr2big; | |
2203 | case -ERANGE: | |
2204 | return nfserr_toosmall; | |
2205 | } | |
2206 | return nfserrno(err); | |
2207 | } | |
2208 | ||
2209 | /* | |
2210 | * Retrieve the specified user extended attribute. To avoid always | |
2211 | * having to allocate the maximum size (since we are not getting | |
2212 | * a maximum size from the RPC), do a probe + alloc. Hold a reader | |
2213 | * lock on i_rwsem to prevent the extended attribute from changing | |
2214 | * size while we're doing this. | |
2215 | */ | |
2216 | __be32 | |
2217 | nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name, | |
2218 | void **bufp, int *lenp) | |
2219 | { | |
2220 | ssize_t len; | |
2221 | __be32 err; | |
2222 | char *buf; | |
2223 | struct inode *inode; | |
2224 | struct dentry *dentry; | |
2225 | ||
2226 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_READ); | |
2227 | if (err) | |
2228 | return err; | |
2229 | ||
2230 | err = nfs_ok; | |
2231 | dentry = fhp->fh_dentry; | |
2232 | inode = d_inode(dentry); | |
2233 | ||
2234 | inode_lock_shared(inode); | |
2235 | ||
4609e1f1 | 2236 | len = vfs_getxattr(&nop_mnt_idmap, dentry, name, NULL, 0); |
32119446 FL |
2237 | |
2238 | /* | |
2239 | * Zero-length attribute, just return. | |
2240 | */ | |
2241 | if (len == 0) { | |
2242 | *bufp = NULL; | |
2243 | *lenp = 0; | |
2244 | goto out; | |
2245 | } | |
2246 | ||
2247 | if (len < 0) { | |
2248 | err = nfsd_xattr_errno(len); | |
2249 | goto out; | |
2250 | } | |
2251 | ||
2252 | if (len > *lenp) { | |
2253 | err = nfserr_toosmall; | |
2254 | goto out; | |
2255 | } | |
2256 | ||
22b620ec | 2257 | buf = kvmalloc(len, GFP_KERNEL); |
32119446 FL |
2258 | if (buf == NULL) { |
2259 | err = nfserr_jukebox; | |
2260 | goto out; | |
2261 | } | |
2262 | ||
4609e1f1 | 2263 | len = vfs_getxattr(&nop_mnt_idmap, dentry, name, buf, len); |
32119446 FL |
2264 | if (len <= 0) { |
2265 | kvfree(buf); | |
2266 | buf = NULL; | |
2267 | err = nfsd_xattr_errno(len); | |
2268 | } | |
2269 | ||
2270 | *lenp = len; | |
2271 | *bufp = buf; | |
2272 | ||
2273 | out: | |
2274 | inode_unlock_shared(inode); | |
2275 | ||
2276 | return err; | |
2277 | } | |
2278 | ||
2279 | /* | |
2280 | * Retrieve the xattr names. Since we can't know how many are | |
2281 | * user extended attributes, we must get all attributes here, | |
2282 | * and have the XDR encode filter out the "user." ones. | |
2283 | * | |
2284 | * While this could always just allocate an XATTR_LIST_MAX | |
2285 | * buffer, that's a waste, so do a probe + allocate. To | |
2286 | * avoid any changes between the probe and allocate, wrap | |
2287 | * this in inode_lock. | |
2288 | */ | |
2289 | __be32 | |
2290 | nfsd_listxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char **bufp, | |
2291 | int *lenp) | |
2292 | { | |
2293 | ssize_t len; | |
2294 | __be32 err; | |
2295 | char *buf; | |
2296 | struct inode *inode; | |
2297 | struct dentry *dentry; | |
2298 | ||
2299 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_READ); | |
2300 | if (err) | |
2301 | return err; | |
2302 | ||
2303 | dentry = fhp->fh_dentry; | |
2304 | inode = d_inode(dentry); | |
2305 | *lenp = 0; | |
2306 | ||
2307 | inode_lock_shared(inode); | |
2308 | ||
2309 | len = vfs_listxattr(dentry, NULL, 0); | |
2310 | if (len <= 0) { | |
2311 | err = nfsd_xattr_errno(len); | |
2312 | goto out; | |
2313 | } | |
2314 | ||
2315 | if (len > XATTR_LIST_MAX) { | |
2316 | err = nfserr_xattr2big; | |
2317 | goto out; | |
2318 | } | |
2319 | ||
22b620ec | 2320 | buf = kvmalloc(len, GFP_KERNEL); |
32119446 FL |
2321 | if (buf == NULL) { |
2322 | err = nfserr_jukebox; | |
2323 | goto out; | |
2324 | } | |
2325 | ||
2326 | len = vfs_listxattr(dentry, buf, len); | |
2327 | if (len <= 0) { | |
2328 | kvfree(buf); | |
2329 | err = nfsd_xattr_errno(len); | |
2330 | goto out; | |
2331 | } | |
2332 | ||
2333 | *lenp = len; | |
2334 | *bufp = buf; | |
2335 | ||
2336 | err = nfs_ok; | |
2337 | out: | |
2338 | inode_unlock_shared(inode); | |
2339 | ||
2340 | return err; | |
2341 | } | |
2342 | ||
bb4d53d6 N |
2343 | /** |
2344 | * nfsd_removexattr - Remove an extended attribute | |
2345 | * @rqstp: RPC transaction being executed | |
2346 | * @fhp: NFS filehandle of object with xattr to remove | |
2347 | * @name: name of xattr to remove (NUL-terminate) | |
2348 | * | |
2349 | * Pass in a NULL pointer for delegated_inode, and let the client deal | |
2350 | * with NFS4ERR_DELAY (same as with e.g. setattr and remove). | |
2351 | * | |
2352 | * Returns nfs_ok on success, or an nfsstat in network byte order. | |
32119446 FL |
2353 | */ |
2354 | __be32 | |
2355 | nfsd_removexattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name) | |
2356 | { | |
8237284a CL |
2357 | __be32 err; |
2358 | int ret; | |
32119446 FL |
2359 | |
2360 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_WRITE); | |
2361 | if (err) | |
2362 | return err; | |
2363 | ||
2364 | ret = fh_want_write(fhp); | |
2365 | if (ret) | |
2366 | return nfserrno(ret); | |
2367 | ||
bb4d53d6 | 2368 | inode_lock(fhp->fh_dentry->d_inode); |
a332018a JL |
2369 | err = fh_fill_pre_attrs(fhp); |
2370 | if (err != nfs_ok) | |
2371 | goto out_unlock; | |
4609e1f1 | 2372 | ret = __vfs_removexattr_locked(&nop_mnt_idmap, fhp->fh_dentry, |
c7c7a1a1 | 2373 | name, NULL); |
a332018a | 2374 | err = nfsd_xattr_errno(ret); |
bb4d53d6 | 2375 | fh_fill_post_attrs(fhp); |
a332018a | 2376 | out_unlock: |
bb4d53d6 | 2377 | inode_unlock(fhp->fh_dentry->d_inode); |
32119446 FL |
2378 | fh_drop_write(fhp); |
2379 | ||
a332018a | 2380 | return err; |
32119446 FL |
2381 | } |
2382 | ||
2383 | __be32 | |
2384 | nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name, | |
2385 | void *buf, u32 len, u32 flags) | |
2386 | { | |
8237284a CL |
2387 | __be32 err; |
2388 | int ret; | |
32119446 FL |
2389 | |
2390 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_WRITE); | |
2391 | if (err) | |
2392 | return err; | |
2393 | ||
2394 | ret = fh_want_write(fhp); | |
2395 | if (ret) | |
2396 | return nfserrno(ret); | |
bb4d53d6 | 2397 | inode_lock(fhp->fh_dentry->d_inode); |
a332018a JL |
2398 | err = fh_fill_pre_attrs(fhp); |
2399 | if (err != nfs_ok) | |
2400 | goto out_unlock; | |
2401 | ret = __vfs_setxattr_locked(&nop_mnt_idmap, fhp->fh_dentry, | |
2402 | name, buf, len, flags, NULL); | |
bb4d53d6 | 2403 | fh_fill_post_attrs(fhp); |
a332018a JL |
2404 | err = nfsd_xattr_errno(ret); |
2405 | out_unlock: | |
bb4d53d6 | 2406 | inode_unlock(fhp->fh_dentry->d_inode); |
32119446 | 2407 | fh_drop_write(fhp); |
a332018a | 2408 | return err; |
32119446 FL |
2409 | } |
2410 | #endif | |
2411 | ||
1da177e4 LT |
2412 | /* |
2413 | * Check for a user's access permissions to this inode. | |
2414 | */ | |
6264d69d | 2415 | __be32 |
0ec757df BF |
2416 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
2417 | struct dentry *dentry, int acc) | |
1da177e4 | 2418 | { |
2b0143b5 | 2419 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
2420 | int err; |
2421 | ||
aea93397 | 2422 | if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) |
1da177e4 LT |
2423 | return 0; |
2424 | #if 0 | |
2425 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
2426 | acc, | |
8837abca MS |
2427 | (acc & NFSD_MAY_READ)? " read" : "", |
2428 | (acc & NFSD_MAY_WRITE)? " write" : "", | |
2429 | (acc & NFSD_MAY_EXEC)? " exec" : "", | |
2430 | (acc & NFSD_MAY_SATTR)? " sattr" : "", | |
2431 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", | |
2432 | (acc & NFSD_MAY_LOCK)? " lock" : "", | |
2433 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1da177e4 LT |
2434 | inode->i_mode, |
2435 | IS_IMMUTABLE(inode)? " immut" : "", | |
2436 | IS_APPEND(inode)? " append" : "", | |
2c463e95 | 2437 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
1da177e4 | 2438 | dprintk(" owner %d/%d user %d/%d\n", |
5cc0a840 | 2439 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
1da177e4 LT |
2440 | #endif |
2441 | ||
2442 | /* Normally we reject any write/sattr etc access on a read-only file | |
2443 | * system. But if it is IRIX doing check on write-access for a | |
2444 | * device special file, we ignore rofs. | |
2445 | */ | |
8837abca MS |
2446 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
2447 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { | |
2c463e95 DH |
2448 | if (exp_rdonly(rqstp, exp) || |
2449 | __mnt_is_readonly(exp->ex_path.mnt)) | |
1da177e4 | 2450 | return nfserr_rofs; |
8837abca | 2451 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
1da177e4 LT |
2452 | return nfserr_perm; |
2453 | } | |
8837abca | 2454 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
1da177e4 LT |
2455 | return nfserr_perm; |
2456 | ||
8837abca | 2457 | if (acc & NFSD_MAY_LOCK) { |
1da177e4 LT |
2458 | /* If we cannot rely on authentication in NLM requests, |
2459 | * just allow locks, otherwise require read permission, or | |
2460 | * ownership | |
2461 | */ | |
2462 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
2463 | return 0; | |
2464 | else | |
8837abca | 2465 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
1da177e4 LT |
2466 | } |
2467 | /* | |
2468 | * The file owner always gets access permission for accesses that | |
2469 | * would normally be checked at open time. This is to make | |
2470 | * file access work even when the client has done a fchmod(fd, 0). | |
2471 | * | |
2472 | * However, `cp foo bar' should fail nevertheless when bar is | |
2473 | * readonly. A sensible way to do this might be to reject all | |
2474 | * attempts to truncate a read-only file, because a creat() call | |
2475 | * always implies file truncation. | |
2476 | * ... but this isn't really fair. A process may reasonably call | |
2477 | * ftruncate on an open file descriptor on a file with perm 000. | |
2478 | * We must trust the client to do permission checking - using "ACCESS" | |
2479 | * with NFSv3. | |
2480 | */ | |
8837abca | 2481 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
6fab8779 | 2482 | uid_eq(inode->i_uid, current_fsuid())) |
1da177e4 LT |
2483 | return 0; |
2484 | ||
8837abca | 2485 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
4609e1f1 | 2486 | err = inode_permission(&nop_mnt_idmap, inode, |
47291baa | 2487 | acc & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1da177e4 LT |
2488 | |
2489 | /* Allow read access to binaries even when mode 111 */ | |
2490 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
a043226b BF |
2491 | (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || |
2492 | acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) | |
4609e1f1 | 2493 | err = inode_permission(&nop_mnt_idmap, inode, MAY_EXEC); |
1da177e4 LT |
2494 | |
2495 | return err? nfserrno(err) : 0; | |
2496 | } |