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 | ||
f501912a BM |
340 | /* |
341 | * Commit metadata changes to stable storage. | |
342 | */ | |
343 | static int | |
57f64034 | 344 | commit_inode_metadata(struct inode *inode) |
f501912a | 345 | { |
f501912a | 346 | const struct export_operations *export_ops = inode->i_sb->s_export_op; |
f501912a | 347 | |
c3765016 CH |
348 | if (export_ops->commit_metadata) |
349 | return export_ops->commit_metadata(inode); | |
350 | return sync_inode_metadata(inode, 1); | |
f501912a | 351 | } |
6c0a654d | 352 | |
57f64034 TM |
353 | static int |
354 | commit_metadata(struct svc_fh *fhp) | |
355 | { | |
356 | struct inode *inode = d_inode(fhp->fh_dentry); | |
357 | ||
358 | if (!EX_ISSYNC(fhp->fh_export)) | |
359 | return 0; | |
360 | return commit_inode_metadata(inode); | |
361 | } | |
362 | ||
1da177e4 | 363 | /* |
818e5a22 CH |
364 | * Go over the attributes and take care of the small differences between |
365 | * NFS semantics and what Linux expects. | |
1da177e4 | 366 | */ |
818e5a22 CH |
367 | static void |
368 | nfsd_sanitize_attrs(struct inode *inode, struct iattr *iap) | |
1da177e4 | 369 | { |
00801cd9 N |
370 | /* Ignore mode updates on symlinks */ |
371 | if (S_ISLNK(inode->i_mode)) | |
372 | iap->ia_valid &= ~ATTR_MODE; | |
373 | ||
ca456252 | 374 | /* sanitize the mode change */ |
1da177e4 LT |
375 | if (iap->ia_valid & ATTR_MODE) { |
376 | iap->ia_mode &= S_IALLUGO; | |
dee3209d | 377 | iap->ia_mode |= (inode->i_mode & ~S_IALLUGO); |
ca456252 JL |
378 | } |
379 | ||
380 | /* Revoke setuid/setgid on chown */ | |
0953e620 | 381 | if (!S_ISDIR(inode->i_mode) && |
c4fa6d7c | 382 | ((iap->ia_valid & ATTR_UID) || (iap->ia_valid & ATTR_GID))) { |
ca456252 JL |
383 | iap->ia_valid |= ATTR_KILL_PRIV; |
384 | if (iap->ia_valid & ATTR_MODE) { | |
385 | /* we're setting mode too, just clear the s*id bits */ | |
8a0ce7d9 | 386 | iap->ia_mode &= ~S_ISUID; |
ca456252 JL |
387 | if (iap->ia_mode & S_IXGRP) |
388 | iap->ia_mode &= ~S_ISGID; | |
389 | } else { | |
390 | /* set ATTR_KILL_* bits and let VFS handle it */ | |
391 | iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID); | |
8a0ce7d9 | 392 | } |
1da177e4 | 393 | } |
818e5a22 CH |
394 | } |
395 | ||
0839ffb8 BF |
396 | static __be32 |
397 | nfsd_get_write_access(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
398 | struct iattr *iap) | |
399 | { | |
400 | struct inode *inode = d_inode(fhp->fh_dentry); | |
0839ffb8 BF |
401 | |
402 | if (iap->ia_size < inode->i_size) { | |
403 | __be32 err; | |
404 | ||
405 | err = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry, | |
406 | NFSD_MAY_TRUNC | NFSD_MAY_OWNER_OVERRIDE); | |
407 | if (err) | |
408 | return err; | |
409 | } | |
f7e33bdb | 410 | return nfserrno(get_write_access(inode)); |
0839ffb8 BF |
411 | } |
412 | ||
c0aa1913 CL |
413 | static int __nfsd_setattr(struct dentry *dentry, struct iattr *iap) |
414 | { | |
415 | int host_err; | |
416 | ||
417 | if (iap->ia_valid & ATTR_SIZE) { | |
418 | /* | |
419 | * RFC5661, Section 18.30.4: | |
420 | * Changing the size of a file with SETATTR indirectly | |
421 | * changes the time_modify and change attributes. | |
422 | * | |
423 | * (and similar for the older RFCs) | |
424 | */ | |
425 | struct iattr size_attr = { | |
426 | .ia_valid = ATTR_SIZE | ATTR_CTIME | ATTR_MTIME, | |
427 | .ia_size = iap->ia_size, | |
428 | }; | |
429 | ||
430 | if (iap->ia_size < 0) | |
431 | return -EFBIG; | |
432 | ||
abf08576 | 433 | host_err = notify_change(&nop_mnt_idmap, dentry, &size_attr, NULL); |
c0aa1913 CL |
434 | if (host_err) |
435 | return host_err; | |
436 | iap->ia_valid &= ~ATTR_SIZE; | |
437 | ||
438 | /* | |
439 | * Avoid the additional setattr call below if the only other | |
440 | * attribute that the client sends is the mtime, as we update | |
441 | * it as part of the size change above. | |
442 | */ | |
443 | if ((iap->ia_valid & ~ATTR_MTIME) == 0) | |
444 | return 0; | |
445 | } | |
446 | ||
447 | if (!iap->ia_valid) | |
448 | return 0; | |
449 | ||
450 | iap->ia_valid |= ATTR_CTIME; | |
abf08576 | 451 | return notify_change(&nop_mnt_idmap, dentry, iap, NULL); |
c0aa1913 CL |
452 | } |
453 | ||
454 | /** | |
455 | * nfsd_setattr - Set various file attributes. | |
456 | * @rqstp: controlling RPC transaction | |
457 | * @fhp: filehandle of target | |
458 | * @attr: attributes to set | |
459 | * @check_guard: set to 1 if guardtime is a valid timestamp | |
460 | * @guardtime: do not act if ctime.tv_sec does not match this timestamp | |
461 | * | |
462 | * This call may adjust the contents of @attr (in particular, this | |
463 | * call may change the bits in the na_iattr.ia_valid field). | |
464 | * | |
465 | * Returns nfs_ok on success, otherwise an NFS status code is | |
466 | * returned. Caller must release @fhp by calling fh_put in either | |
467 | * case. | |
818e5a22 CH |
468 | */ |
469 | __be32 | |
7fe2a71d N |
470 | nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, |
471 | struct nfsd_attrs *attr, | |
2a1aa489 | 472 | int check_guard, time64_t guardtime) |
818e5a22 CH |
473 | { |
474 | struct dentry *dentry; | |
475 | struct inode *inode; | |
7fe2a71d | 476 | struct iattr *iap = attr->na_iattr; |
818e5a22 CH |
477 | int accmode = NFSD_MAY_SATTR; |
478 | umode_t ftype = 0; | |
479 | __be32 err; | |
c0aa1913 | 480 | int host_err; |
9f67f189 | 481 | bool get_write_count; |
758e99fe | 482 | bool size_change = (iap->ia_valid & ATTR_SIZE); |
34b91dda | 483 | int retries; |
818e5a22 | 484 | |
255fbca6 | 485 | if (iap->ia_valid & ATTR_SIZE) { |
818e5a22 | 486 | accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE; |
818e5a22 | 487 | ftype = S_IFREG; |
255fbca6 | 488 | } |
489 | ||
490 | /* | |
491 | * If utimes(2) and friends are called with times not NULL, we should | |
492 | * not set NFSD_MAY_WRITE bit. Otherwise fh_verify->nfsd_permission | |
e977cc83 | 493 | * will return EACCES, when the caller's effective UID does not match |
255fbca6 | 494 | * the owner of the file, and the caller is not privileged. In this |
495 | * situation, we should return EPERM(notify_change will return this). | |
496 | */ | |
497 | if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME)) { | |
498 | accmode |= NFSD_MAY_OWNER_OVERRIDE; | |
499 | if (!(iap->ia_valid & (ATTR_ATIME_SET | ATTR_MTIME_SET))) | |
500 | accmode |= NFSD_MAY_WRITE; | |
501 | } | |
818e5a22 | 502 | |
9f67f189 BF |
503 | /* Callers that do fh_verify should do the fh_want_write: */ |
504 | get_write_count = !fhp->fh_dentry; | |
505 | ||
818e5a22 CH |
506 | /* Get inode */ |
507 | err = fh_verify(rqstp, fhp, ftype, accmode); | |
508 | if (err) | |
758e99fe | 509 | return err; |
9f67f189 BF |
510 | if (get_write_count) { |
511 | host_err = fh_want_write(fhp); | |
512 | if (host_err) | |
758e99fe | 513 | goto out; |
9f67f189 | 514 | } |
818e5a22 CH |
515 | |
516 | dentry = fhp->fh_dentry; | |
2b0143b5 | 517 | inode = d_inode(dentry); |
818e5a22 | 518 | |
818e5a22 CH |
519 | nfsd_sanitize_attrs(inode, iap); |
520 | ||
758e99fe CH |
521 | if (check_guard && guardtime != inode->i_ctime.tv_sec) |
522 | return nfserr_notsync; | |
523 | ||
818e5a22 CH |
524 | /* |
525 | * The size case is special, it changes the file in addition to the | |
783112f7 CH |
526 | * attributes, and file systems don't expect it to be mixed with |
527 | * "random" attribute changes. We thus split out the size change | |
528 | * into a separate call to ->setattr, and do the rest as a separate | |
529 | * setattr call. | |
818e5a22 | 530 | */ |
758e99fe | 531 | if (size_change) { |
0839ffb8 BF |
532 | err = nfsd_get_write_access(rqstp, fhp, iap); |
533 | if (err) | |
758e99fe | 534 | return err; |
783112f7 | 535 | } |
f0c63124 | 536 | |
bb4d53d6 | 537 | inode_lock(inode); |
34b91dda CL |
538 | for (retries = 1;;) { |
539 | host_err = __nfsd_setattr(dentry, iap); | |
540 | if (host_err != -EAGAIN || !retries--) | |
541 | break; | |
542 | if (!nfsd_wait_for_delegreturn(rqstp, inode)) | |
543 | break; | |
544 | } | |
d6a97d3f N |
545 | if (attr->na_seclabel && attr->na_seclabel->len) |
546 | attr->na_labelerr = security_inode_setsecctx(dentry, | |
547 | attr->na_seclabel->data, attr->na_seclabel->len); | |
c0cbe707 | 548 | if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && attr->na_pacl) |
13e83a49 | 549 | attr->na_aclerr = set_posix_acl(&nop_mnt_idmap, |
138060ba | 550 | dentry, ACL_TYPE_ACCESS, |
c0cbe707 N |
551 | attr->na_pacl); |
552 | if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && | |
553 | !attr->na_aclerr && attr->na_dpacl && S_ISDIR(inode->i_mode)) | |
13e83a49 | 554 | attr->na_aclerr = set_posix_acl(&nop_mnt_idmap, |
138060ba | 555 | dentry, ACL_TYPE_DEFAULT, |
c0cbe707 | 556 | attr->na_dpacl); |
bb4d53d6 | 557 | inode_unlock(inode); |
0839ffb8 BF |
558 | if (size_change) |
559 | put_write_access(inode); | |
0839ffb8 | 560 | out: |
758e99fe CH |
561 | if (!host_err) |
562 | host_err = commit_metadata(fhp); | |
563 | return nfserrno(host_err); | |
1da177e4 LT |
564 | } |
565 | ||
5be196e5 | 566 | #if defined(CONFIG_NFSD_V4) |
9b4146e8 CL |
567 | /* |
568 | * NFS junction information is stored in an extended attribute. | |
569 | */ | |
570 | #define NFSD_JUNCTION_XATTR_NAME XATTR_TRUSTED_PREFIX "junction.nfs" | |
571 | ||
572 | /** | |
573 | * nfsd4_is_junction - Test if an object could be an NFS junction | |
574 | * | |
575 | * @dentry: object to test | |
576 | * | |
577 | * Returns 1 if "dentry" appears to contain NFS junction information. | |
578 | * Otherwise 0 is returned. | |
579 | */ | |
11fcee02 TM |
580 | int nfsd4_is_junction(struct dentry *dentry) |
581 | { | |
2b0143b5 | 582 | struct inode *inode = d_inode(dentry); |
11fcee02 TM |
583 | |
584 | if (inode == NULL) | |
585 | return 0; | |
586 | if (inode->i_mode & S_IXUGO) | |
587 | return 0; | |
588 | if (!(inode->i_mode & S_ISVTX)) | |
589 | return 0; | |
4609e1f1 | 590 | if (vfs_getxattr(&nop_mnt_idmap, dentry, NFSD_JUNCTION_XATTR_NAME, |
c7c7a1a1 | 591 | NULL, 0) <= 0) |
11fcee02 TM |
592 | return 0; |
593 | return 1; | |
594 | } | |
18032ca0 | 595 | |
a2f4c3fa TM |
596 | static struct nfsd4_compound_state *nfsd4_get_cstate(struct svc_rqst *rqstp) |
597 | { | |
598 | return &((struct nfsd4_compoundres *)rqstp->rq_resp)->cstate; | |
599 | } | |
600 | ||
601 | __be32 nfsd4_clone_file_range(struct svc_rqst *rqstp, | |
602 | struct nfsd_file *nf_src, u64 src_pos, | |
603 | struct nfsd_file *nf_dst, u64 dst_pos, | |
604 | u64 count, bool sync) | |
ffa0160a | 605 | { |
b66ae6dd TM |
606 | struct file *src = nf_src->nf_file; |
607 | struct file *dst = nf_dst->nf_file; | |
555dbf1a | 608 | errseq_t since; |
42ec3d4c | 609 | loff_t cloned; |
1b28d756 | 610 | __be32 ret = 0; |
42ec3d4c | 611 | |
555dbf1a | 612 | since = READ_ONCE(dst->f_wb_err); |
452ce659 | 613 | cloned = vfs_clone_file_range(src, src_pos, dst, dst_pos, count, 0); |
1b28d756 TM |
614 | if (cloned < 0) { |
615 | ret = nfserrno(cloned); | |
616 | goto out_err; | |
617 | } | |
618 | if (count && cloned != count) { | |
619 | ret = nfserrno(-EINVAL); | |
620 | goto out_err; | |
621 | } | |
a25e3726 TM |
622 | if (sync) { |
623 | loff_t dst_end = count ? dst_pos + count - 1 : LLONG_MAX; | |
624 | int status = vfs_fsync_range(dst, dst_pos, dst_end, 0); | |
57f64034 | 625 | |
555dbf1a TM |
626 | if (!status) |
627 | status = filemap_check_wb_err(dst->f_mapping, since); | |
57f64034 TM |
628 | if (!status) |
629 | status = commit_inode_metadata(file_inode(src)); | |
1b28d756 | 630 | if (status < 0) { |
75acacb6 CL |
631 | struct nfsd_net *nn = net_generic(nf_dst->nf_net, |
632 | nfsd_net_id); | |
633 | ||
a2f4c3fa TM |
634 | trace_nfsd_clone_file_range_err(rqstp, |
635 | &nfsd4_get_cstate(rqstp)->save_fh, | |
636 | src_pos, | |
637 | &nfsd4_get_cstate(rqstp)->current_fh, | |
638 | dst_pos, | |
639 | count, status); | |
75acacb6 CL |
640 | nfsd_reset_write_verifier(nn); |
641 | trace_nfsd_writeverf_reset(nn, rqstp, status); | |
1b28d756 TM |
642 | ret = nfserrno(status); |
643 | } | |
a25e3726 | 644 | } |
1b28d756 | 645 | out_err: |
1b28d756 | 646 | return ret; |
ffa0160a CH |
647 | } |
648 | ||
29ae7f9d AS |
649 | ssize_t nfsd_copy_file_range(struct file *src, u64 src_pos, struct file *dst, |
650 | u64 dst_pos, u64 count) | |
651 | { | |
868f9f2f | 652 | ssize_t ret; |
29ae7f9d AS |
653 | |
654 | /* | |
655 | * Limit copy to 4MB to prevent indefinitely blocking an nfsd | |
656 | * thread and client rpc slot. The choice of 4MB is somewhat | |
657 | * arbitrary. We might instead base this on r/wsize, or make it | |
658 | * tunable, or use a time instead of a byte limit, or implement | |
659 | * asynchronous copy. In theory a client could also recognize a | |
660 | * limit like this and pipeline multiple COPY requests. | |
661 | */ | |
662 | count = min_t(u64, count, 1 << 22); | |
868f9f2f AG |
663 | ret = vfs_copy_file_range(src, src_pos, dst, dst_pos, count, 0); |
664 | ||
665 | if (ret == -EOPNOTSUPP || ret == -EXDEV) | |
10bc8e4a AG |
666 | ret = vfs_copy_file_range(src, src_pos, dst, dst_pos, count, |
667 | COPY_FILE_SPLICE); | |
868f9f2f | 668 | return ret; |
29ae7f9d AS |
669 | } |
670 | ||
95d871f0 AS |
671 | __be32 nfsd4_vfs_fallocate(struct svc_rqst *rqstp, struct svc_fh *fhp, |
672 | struct file *file, loff_t offset, loff_t len, | |
673 | int flags) | |
674 | { | |
95d871f0 AS |
675 | int error; |
676 | ||
677 | if (!S_ISREG(file_inode(file)->i_mode)) | |
678 | return nfserr_inval; | |
679 | ||
95d871f0 AS |
680 | error = vfs_fallocate(file, flags, offset, len); |
681 | if (!error) | |
682 | error = commit_metadata(fhp); | |
683 | ||
684 | return nfserrno(error); | |
685 | } | |
6a85d6c7 | 686 | #endif /* defined(CONFIG_NFSD_V4) */ |
1da177e4 | 687 | |
1da177e4 LT |
688 | /* |
689 | * Check server access rights to a file system object | |
690 | */ | |
691 | struct accessmap { | |
692 | u32 access; | |
693 | int how; | |
694 | }; | |
695 | static struct accessmap nfs3_regaccess[] = { | |
8837abca MS |
696 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
697 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
698 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_TRUNC }, | |
699 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE }, | |
1da177e4 | 700 | |
c11d7fd1 FL |
701 | #ifdef CONFIG_NFSD_V4 |
702 | { NFS4_ACCESS_XAREAD, NFSD_MAY_READ }, | |
703 | { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE }, | |
704 | { NFS4_ACCESS_XALIST, NFSD_MAY_READ }, | |
705 | #endif | |
706 | ||
1da177e4 LT |
707 | { 0, 0 } |
708 | }; | |
709 | ||
710 | static struct accessmap nfs3_diraccess[] = { | |
8837abca MS |
711 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
712 | { NFS3_ACCESS_LOOKUP, NFSD_MAY_EXEC }, | |
713 | { NFS3_ACCESS_MODIFY, NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC}, | |
714 | { NFS3_ACCESS_EXTEND, NFSD_MAY_EXEC|NFSD_MAY_WRITE }, | |
715 | { NFS3_ACCESS_DELETE, NFSD_MAY_REMOVE }, | |
1da177e4 | 716 | |
c11d7fd1 FL |
717 | #ifdef CONFIG_NFSD_V4 |
718 | { NFS4_ACCESS_XAREAD, NFSD_MAY_READ }, | |
719 | { NFS4_ACCESS_XAWRITE, NFSD_MAY_WRITE }, | |
720 | { NFS4_ACCESS_XALIST, NFSD_MAY_READ }, | |
721 | #endif | |
722 | ||
1da177e4 LT |
723 | { 0, 0 } |
724 | }; | |
725 | ||
726 | static struct accessmap nfs3_anyaccess[] = { | |
727 | /* Some clients - Solaris 2.6 at least, make an access call | |
728 | * to the server to check for access for things like /dev/null | |
729 | * (which really, the server doesn't care about). So | |
730 | * We provide simple access checking for them, looking | |
731 | * mainly at mode bits, and we make sure to ignore read-only | |
732 | * filesystem checks | |
733 | */ | |
8837abca MS |
734 | { NFS3_ACCESS_READ, NFSD_MAY_READ }, |
735 | { NFS3_ACCESS_EXECUTE, NFSD_MAY_EXEC }, | |
736 | { NFS3_ACCESS_MODIFY, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
737 | { NFS3_ACCESS_EXTEND, NFSD_MAY_WRITE|NFSD_MAY_LOCAL_ACCESS }, | |
1da177e4 LT |
738 | |
739 | { 0, 0 } | |
740 | }; | |
741 | ||
6264d69d | 742 | __be32 |
1da177e4 LT |
743 | nfsd_access(struct svc_rqst *rqstp, struct svc_fh *fhp, u32 *access, u32 *supported) |
744 | { | |
745 | struct accessmap *map; | |
746 | struct svc_export *export; | |
747 | struct dentry *dentry; | |
748 | u32 query, result = 0, sresult = 0; | |
6264d69d | 749 | __be32 error; |
1da177e4 | 750 | |
8837abca | 751 | error = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
752 | if (error) |
753 | goto out; | |
754 | ||
755 | export = fhp->fh_export; | |
756 | dentry = fhp->fh_dentry; | |
757 | ||
e36cb0b8 | 758 | if (d_is_reg(dentry)) |
1da177e4 | 759 | map = nfs3_regaccess; |
e36cb0b8 | 760 | else if (d_is_dir(dentry)) |
1da177e4 LT |
761 | map = nfs3_diraccess; |
762 | else | |
763 | map = nfs3_anyaccess; | |
764 | ||
765 | ||
766 | query = *access; | |
767 | for (; map->access; map++) { | |
768 | if (map->access & query) { | |
6264d69d | 769 | __be32 err2; |
1da177e4 LT |
770 | |
771 | sresult |= map->access; | |
772 | ||
0ec757df | 773 | err2 = nfsd_permission(rqstp, export, dentry, map->how); |
1da177e4 LT |
774 | switch (err2) { |
775 | case nfs_ok: | |
776 | result |= map->access; | |
777 | break; | |
778 | ||
779 | /* the following error codes just mean the access was not allowed, | |
780 | * rather than an error occurred */ | |
781 | case nfserr_rofs: | |
782 | case nfserr_acces: | |
783 | case nfserr_perm: | |
784 | /* simply don't "or" in the access bit. */ | |
785 | break; | |
786 | default: | |
787 | error = err2; | |
788 | goto out; | |
789 | } | |
790 | } | |
791 | } | |
792 | *access = result; | |
793 | if (supported) | |
794 | *supported = sresult; | |
795 | ||
796 | out: | |
797 | return error; | |
798 | } | |
1da177e4 | 799 | |
65294c1f | 800 | int nfsd_open_break_lease(struct inode *inode, int access) |
105f4622 BF |
801 | { |
802 | unsigned int mode; | |
1da177e4 | 803 | |
105f4622 BF |
804 | if (access & NFSD_MAY_NOT_BREAK_LEASE) |
805 | return 0; | |
806 | mode = (access & NFSD_MAY_WRITE) ? O_WRONLY : O_RDONLY; | |
807 | return break_lease(inode, mode | O_NONBLOCK); | |
808 | } | |
1da177e4 LT |
809 | |
810 | /* | |
811 | * Open an existing file or directory. | |
999448a8 BS |
812 | * The may_flags argument indicates the type of open (read/write/lock) |
813 | * and additional flags. | |
1da177e4 LT |
814 | * N.B. After this call fhp needs an fh_put |
815 | */ | |
65294c1f JL |
816 | static __be32 |
817 | __nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, | |
999448a8 | 818 | int may_flags, struct file **filp) |
1da177e4 | 819 | { |
765927b2 | 820 | struct path path; |
1da177e4 | 821 | struct inode *inode; |
8519f994 | 822 | struct file *file; |
6264d69d AV |
823 | int flags = O_RDONLY|O_LARGEFILE; |
824 | __be32 err; | |
91885258 | 825 | int host_err = 0; |
1da177e4 | 826 | |
765927b2 AV |
827 | path.mnt = fhp->fh_export->ex_path.mnt; |
828 | path.dentry = fhp->fh_dentry; | |
2b0143b5 | 829 | inode = d_inode(path.dentry); |
1da177e4 | 830 | |
1da177e4 | 831 | err = nfserr_perm; |
999448a8 | 832 | if (IS_APPEND(inode) && (may_flags & NFSD_MAY_WRITE)) |
1da177e4 | 833 | goto out; |
1da177e4 LT |
834 | |
835 | if (!inode->i_fop) | |
836 | goto out; | |
837 | ||
999448a8 | 838 | host_err = nfsd_open_break_lease(inode, may_flags); |
6264d69d | 839 | if (host_err) /* NOMEM or WOULDBLOCK */ |
1da177e4 LT |
840 | goto out_nfserr; |
841 | ||
999448a8 BS |
842 | if (may_flags & NFSD_MAY_WRITE) { |
843 | if (may_flags & NFSD_MAY_READ) | |
9ecb6a08 BF |
844 | flags = O_RDWR|O_LARGEFILE; |
845 | else | |
846 | flags = O_WRONLY|O_LARGEFILE; | |
1da177e4 | 847 | } |
999448a8 | 848 | |
8519f994 KM |
849 | file = dentry_open(&path, flags, current_cred()); |
850 | if (IS_ERR(file)) { | |
851 | host_err = PTR_ERR(file); | |
852 | goto out_nfserr; | |
853 | } | |
854 | ||
6035a27b | 855 | host_err = ima_file_check(file, may_flags); |
8519f994 | 856 | if (host_err) { |
fd891454 | 857 | fput(file); |
8519f994 | 858 | goto out_nfserr; |
06effdbb BS |
859 | } |
860 | ||
8519f994 KM |
861 | if (may_flags & NFSD_MAY_64BIT_COOKIE) |
862 | file->f_mode |= FMODE_64BITHASH; | |
863 | else | |
864 | file->f_mode |= FMODE_32BITHASH; | |
865 | ||
866 | *filp = file; | |
1da177e4 | 867 | out_nfserr: |
6264d69d | 868 | err = nfserrno(host_err); |
1da177e4 | 869 | out: |
65294c1f JL |
870 | return err; |
871 | } | |
872 | ||
873 | __be32 | |
874 | nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, | |
875 | int may_flags, struct file **filp) | |
876 | { | |
877 | __be32 err; | |
12bcbd40 | 878 | bool retried = false; |
65294c1f JL |
879 | |
880 | validate_process_creds(); | |
881 | /* | |
882 | * If we get here, then the client has already done an "open", | |
883 | * and (hopefully) checked permission - so allow OWNER_OVERRIDE | |
884 | * in case a chmod has now revoked permission. | |
885 | * | |
886 | * Arguably we should also allow the owner override for | |
887 | * directories, but we never have and it doesn't seem to have | |
888 | * caused anyone a problem. If we were to change this, note | |
889 | * also that our filldir callbacks would need a variant of | |
890 | * lookup_one_len that doesn't check permissions. | |
891 | */ | |
892 | if (type == S_IFREG) | |
893 | may_flags |= NFSD_MAY_OWNER_OVERRIDE; | |
12bcbd40 | 894 | retry: |
65294c1f | 895 | err = fh_verify(rqstp, fhp, type, may_flags); |
12bcbd40 | 896 | if (!err) { |
65294c1f | 897 | err = __nfsd_open(rqstp, fhp, type, may_flags, filp); |
12bcbd40 JL |
898 | if (err == nfserr_stale && !retried) { |
899 | retried = true; | |
900 | fh_put(fhp); | |
901 | goto retry; | |
902 | } | |
903 | } | |
65294c1f JL |
904 | validate_process_creds(); |
905 | return err; | |
906 | } | |
907 | ||
f4d84c52 CL |
908 | /** |
909 | * nfsd_open_verified - Open a regular file for the filecache | |
910 | * @rqstp: RPC request | |
911 | * @fhp: NFS filehandle of the file to open | |
912 | * @may_flags: internal permission flags | |
913 | * @filp: OUT: open "struct file *" | |
914 | * | |
915 | * Returns an nfsstat value in network byte order. | |
916 | */ | |
65294c1f | 917 | __be32 |
f4d84c52 CL |
918 | nfsd_open_verified(struct svc_rqst *rqstp, struct svc_fh *fhp, int may_flags, |
919 | struct file **filp) | |
65294c1f JL |
920 | { |
921 | __be32 err; | |
922 | ||
923 | validate_process_creds(); | |
f4d84c52 | 924 | err = __nfsd_open(rqstp, fhp, S_IFREG, may_flags, filp); |
e0e81739 | 925 | validate_process_creds(); |
1da177e4 LT |
926 | return err; |
927 | } | |
928 | ||
1da177e4 | 929 | /* |
cf8208d0 JA |
930 | * Grab and keep cached pages associated with a file in the svc_rqst |
931 | * so that they can be passed to the network sendmsg/sendpage routines | |
932 | * directly. They will be released after the sending has completed. | |
0f516248 CL |
933 | * |
934 | * Return values: Number of bytes consumed, or -EIO if there are no | |
935 | * remaining pages in rqstp->rq_pages. | |
1da177e4 LT |
936 | */ |
937 | static int | |
cf8208d0 JA |
938 | nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, |
939 | struct splice_desc *sd) | |
1da177e4 | 940 | { |
cf8208d0 | 941 | struct svc_rqst *rqstp = sd->u.data; |
bfbfb618 AV |
942 | struct page *page = buf->page; // may be a compound one |
943 | unsigned offset = buf->offset; | |
ac8db824 | 944 | struct page *last_page; |
bfbfb618 | 945 | |
ac8db824 | 946 | last_page = page + (offset + sd->len - 1) / PAGE_SIZE; |
27c934dd JL |
947 | for (page += offset / PAGE_SIZE; page <= last_page; page++) { |
948 | /* | |
949 | * Skip page replacement when extending the contents | |
950 | * of the current page. | |
951 | */ | |
952 | if (page == *(rqstp->rq_next_page - 1)) | |
953 | continue; | |
0f516248 CL |
954 | if (unlikely(!svc_rqst_replace_page(rqstp, page))) |
955 | return -EIO; | |
27c934dd | 956 | } |
bfbfb618 AV |
957 | if (rqstp->rq_res.page_len == 0) // first call |
958 | rqstp->rq_res.page_base = offset % PAGE_SIZE; | |
c7e0b781 | 959 | rqstp->rq_res.page_len += sd->len; |
c7e0b781 | 960 | return sd->len; |
1da177e4 LT |
961 | } |
962 | ||
cf8208d0 JA |
963 | static int nfsd_direct_splice_actor(struct pipe_inode_info *pipe, |
964 | struct splice_desc *sd) | |
965 | { | |
966 | return __splice_from_pipe(pipe, sd, nfsd_splice_actor); | |
967 | } | |
968 | ||
83a63072 TM |
969 | static u32 nfsd_eof_on_read(struct file *file, loff_t offset, ssize_t len, |
970 | size_t expected) | |
971 | { | |
972 | if (expected != 0 && len == 0) | |
973 | return 1; | |
974 | if (offset+len >= i_size_read(file_inode(file))) | |
975 | return 1; | |
976 | return 0; | |
977 | } | |
978 | ||
87c5942e CL |
979 | static __be32 nfsd_finish_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
980 | struct file *file, loff_t offset, | |
83a63072 | 981 | unsigned long *count, u32 *eof, ssize_t host_err) |
1da177e4 | 982 | { |
6264d69d | 983 | if (host_err >= 0) { |
20ad856e | 984 | nfsd_stats_io_read_add(fhp->fh_export, host_err); |
83a63072 | 985 | *eof = nfsd_eof_on_read(file, offset, host_err, *count); |
6264d69d | 986 | *count = host_err; |
2a12a9d7 | 987 | fsnotify_access(file); |
87c5942e | 988 | trace_nfsd_read_io_done(rqstp, fhp, offset, *count); |
dc97618d | 989 | return 0; |
87c5942e CL |
990 | } else { |
991 | trace_nfsd_read_err(rqstp, fhp, offset, host_err); | |
dc97618d | 992 | return nfserrno(host_err); |
87c5942e | 993 | } |
dc97618d BF |
994 | } |
995 | ||
87c5942e | 996 | __be32 nfsd_splice_read(struct svc_rqst *rqstp, struct svc_fh *fhp, |
83a63072 TM |
997 | struct file *file, loff_t offset, unsigned long *count, |
998 | u32 *eof) | |
dc97618d BF |
999 | { |
1000 | struct splice_desc sd = { | |
1001 | .len = 0, | |
1002 | .total_len = *count, | |
1003 | .pos = offset, | |
1004 | .u.data = rqstp, | |
1005 | }; | |
83a63072 | 1006 | ssize_t host_err; |
dc97618d | 1007 | |
87c5942e | 1008 | trace_nfsd_read_splice(rqstp, fhp, offset, *count); |
dc97618d BF |
1009 | rqstp->rq_next_page = rqstp->rq_respages + 1; |
1010 | host_err = splice_direct_to_actor(file, &sd, nfsd_direct_splice_actor); | |
83a63072 | 1011 | return nfsd_finish_read(rqstp, fhp, file, offset, count, eof, host_err); |
dc97618d BF |
1012 | } |
1013 | ||
87c5942e CL |
1014 | __be32 nfsd_readv(struct svc_rqst *rqstp, struct svc_fh *fhp, |
1015 | struct file *file, loff_t offset, | |
83a63072 TM |
1016 | struct kvec *vec, int vlen, unsigned long *count, |
1017 | u32 *eof) | |
dc97618d | 1018 | { |
73da852e | 1019 | struct iov_iter iter; |
83a63072 TM |
1020 | loff_t ppos = offset; |
1021 | ssize_t host_err; | |
dc97618d | 1022 | |
87c5942e | 1023 | trace_nfsd_read_vector(rqstp, fhp, offset, *count); |
de4eda9d | 1024 | iov_iter_kvec(&iter, ITER_DEST, vec, vlen, *count); |
83a63072 TM |
1025 | host_err = vfs_iter_read(file, &iter, &ppos, 0); |
1026 | return nfsd_finish_read(rqstp, fhp, file, offset, count, eof, host_err); | |
1da177e4 LT |
1027 | } |
1028 | ||
d911df7b BF |
1029 | /* |
1030 | * Gathered writes: If another process is currently writing to the file, | |
1031 | * there's a high chance this is another nfsd (triggered by a bulk write | |
1032 | * from a client's biod). Rather than syncing the file with each write | |
1033 | * request, we sleep for 10 msec. | |
1034 | * | |
1035 | * I don't know if this roughly approximates C. Juszak's idea of | |
1036 | * gathered writes, but it's a nice and simple solution (IMHO), and it | |
1037 | * seems to work:-) | |
1038 | * | |
1039 | * Note: we do this only in the NFSv2 case, since v3 and higher have a | |
1040 | * better tool (separate unstable writes and commits) for solving this | |
1041 | * problem. | |
1042 | */ | |
1043 | static int wait_for_concurrent_writes(struct file *file) | |
1044 | { | |
496ad9aa | 1045 | struct inode *inode = file_inode(file); |
d911df7b BF |
1046 | static ino_t last_ino; |
1047 | static dev_t last_dev; | |
1048 | int err = 0; | |
1049 | ||
1050 | if (atomic_read(&inode->i_writecount) > 1 | |
1051 | || (last_ino == inode->i_ino && last_dev == inode->i_sb->s_dev)) { | |
1052 | dprintk("nfsd: write defer %d\n", task_pid_nr(current)); | |
1053 | msleep(10); | |
1054 | dprintk("nfsd: write resume %d\n", task_pid_nr(current)); | |
1055 | } | |
1056 | ||
1057 | if (inode->i_state & I_DIRTY) { | |
1058 | dprintk("nfsd: write sync %d\n", task_pid_nr(current)); | |
8018ab05 | 1059 | err = vfs_fsync(file, 0); |
d911df7b BF |
1060 | } |
1061 | last_ino = inode->i_ino; | |
1062 | last_dev = inode->i_sb->s_dev; | |
1063 | return err; | |
1064 | } | |
1065 | ||
af90f707 | 1066 | __be32 |
16f8f894 | 1067 | nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, |
1da177e4 | 1068 | loff_t offset, struct kvec *vec, int vlen, |
19e0663f TM |
1069 | unsigned long *cnt, int stable, |
1070 | __be32 *verf) | |
1da177e4 | 1071 | { |
fb7622c2 | 1072 | struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id); |
16f8f894 | 1073 | struct file *file = nf->nf_file; |
01cbf385 | 1074 | struct super_block *sb = file_inode(file)->i_sb; |
1da177e4 | 1075 | struct svc_export *exp; |
73da852e | 1076 | struct iov_iter iter; |
555dbf1a | 1077 | errseq_t since; |
d890be15 | 1078 | __be32 nfserr; |
6264d69d | 1079 | int host_err; |
48e03bc5 | 1080 | int use_wgather; |
e49dbbf3 | 1081 | loff_t pos = offset; |
01cbf385 | 1082 | unsigned long exp_op_flags = 0; |
8658452e | 1083 | unsigned int pflags = current->flags; |
ddef7ed2 | 1084 | rwf_t flags = 0; |
01cbf385 | 1085 | bool restore_flags = false; |
8658452e | 1086 | |
d890be15 CL |
1087 | trace_nfsd_write_opened(rqstp, fhp, offset, *cnt); |
1088 | ||
01cbf385 TM |
1089 | if (sb->s_export_op) |
1090 | exp_op_flags = sb->s_export_op->flags; | |
1091 | ||
1092 | if (test_bit(RQ_LOCAL, &rqstp->rq_flags) && | |
1093 | !(exp_op_flags & EXPORT_OP_REMOTE_FS)) { | |
8658452e | 1094 | /* |
a37b0715 N |
1095 | * We want throttling in balance_dirty_pages() |
1096 | * and shrink_inactive_list() to only consider | |
1097 | * the backingdev we are writing to, so that nfs to | |
8658452e N |
1098 | * localhost doesn't cause nfsd to lock up due to all |
1099 | * the client's dirty pages or its congested queue. | |
1100 | */ | |
a37b0715 | 1101 | current->flags |= PF_LOCAL_THROTTLE; |
01cbf385 TM |
1102 | restore_flags = true; |
1103 | } | |
1da177e4 | 1104 | |
865d50b2 | 1105 | exp = fhp->fh_export; |
48e03bc5 | 1106 | use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp); |
1da177e4 | 1107 | |
1da177e4 | 1108 | if (!EX_ISSYNC(exp)) |
54bbb7d2 | 1109 | stable = NFS_UNSTABLE; |
1da177e4 | 1110 | |
24368aad CH |
1111 | if (stable && !use_wgather) |
1112 | flags |= RWF_SYNC; | |
1113 | ||
de4eda9d | 1114 | iov_iter_kvec(&iter, ITER_SOURCE, vec, vlen, *cnt); |
555dbf1a | 1115 | since = READ_ONCE(file->f_wb_err); |
33388b3a | 1116 | if (verf) |
3988a578 | 1117 | nfsd_copy_write_verifier(verf, nn); |
fd9a2e1d | 1118 | file_start_write(file); |
33388b3a | 1119 | host_err = vfs_iter_write(file, &iter, &pos, flags); |
fd9a2e1d | 1120 | file_end_write(file); |
7bf94c6b | 1121 | if (host_err < 0) { |
3988a578 | 1122 | nfsd_reset_write_verifier(nn); |
75acacb6 | 1123 | trace_nfsd_writeverf_reset(nn, rqstp, host_err); |
e4636d53 | 1124 | goto out_nfserr; |
7bf94c6b | 1125 | } |
09a80f2a | 1126 | *cnt = host_err; |
20ad856e | 1127 | nfsd_stats_io_write_add(exp, *cnt); |
2a12a9d7 | 1128 | fsnotify_modify(file); |
555dbf1a TM |
1129 | host_err = filemap_check_wb_err(file->f_mapping, since); |
1130 | if (host_err < 0) | |
1131 | goto out_nfserr; | |
1da177e4 | 1132 | |
bbf2f098 | 1133 | if (stable && use_wgather) { |
24368aad | 1134 | host_err = wait_for_concurrent_writes(file); |
75acacb6 | 1135 | if (host_err < 0) { |
3988a578 | 1136 | nfsd_reset_write_verifier(nn); |
75acacb6 CL |
1137 | trace_nfsd_writeverf_reset(nn, rqstp, host_err); |
1138 | } | |
bbf2f098 | 1139 | } |
1da177e4 | 1140 | |
e4636d53 | 1141 | out_nfserr: |
d890be15 CL |
1142 | if (host_err >= 0) { |
1143 | trace_nfsd_write_io_done(rqstp, fhp, offset, *cnt); | |
1144 | nfserr = nfs_ok; | |
1145 | } else { | |
1146 | trace_nfsd_write_err(rqstp, fhp, offset, host_err); | |
1147 | nfserr = nfserrno(host_err); | |
1148 | } | |
01cbf385 | 1149 | if (restore_flags) |
a37b0715 | 1150 | current_restore_flags(pflags, PF_LOCAL_THROTTLE); |
d890be15 | 1151 | return nfserr; |
1da177e4 LT |
1152 | } |
1153 | ||
dc97618d BF |
1154 | /* |
1155 | * Read data from a file. count must contain the requested read count | |
1156 | * on entry. On return, *count contains the number of bytes actually read. | |
1157 | * N.B. After this call fhp needs an fh_put | |
1158 | */ | |
1159 | __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
83a63072 TM |
1160 | loff_t offset, struct kvec *vec, int vlen, unsigned long *count, |
1161 | u32 *eof) | |
dc97618d | 1162 | { |
48cd7b51 | 1163 | struct nfsd_file *nf; |
dc97618d | 1164 | struct file *file; |
dc97618d BF |
1165 | __be32 err; |
1166 | ||
f394b62b | 1167 | trace_nfsd_read_start(rqstp, fhp, offset, *count); |
4d1ea845 | 1168 | err = nfsd_file_acquire_gc(rqstp, fhp, NFSD_MAY_READ, &nf); |
dc97618d BF |
1169 | if (err) |
1170 | return err; | |
1171 | ||
48cd7b51 | 1172 | file = nf->nf_file; |
a4058c5b | 1173 | if (file->f_op->splice_read && test_bit(RQ_SPLICE_OK, &rqstp->rq_flags)) |
83a63072 | 1174 | err = nfsd_splice_read(rqstp, fhp, file, offset, count, eof); |
a4058c5b | 1175 | else |
83a63072 | 1176 | err = nfsd_readv(rqstp, fhp, file, offset, vec, vlen, count, eof); |
6e8b50d1 | 1177 | |
48cd7b51 | 1178 | nfsd_file_put(nf); |
dc97618d | 1179 | |
f394b62b | 1180 | trace_nfsd_read_done(rqstp, fhp, offset, *count); |
6e8b50d1 | 1181 | |
fa0a2126 BF |
1182 | return err; |
1183 | } | |
1184 | ||
1da177e4 LT |
1185 | /* |
1186 | * Write data to a file. | |
1187 | * The stable flag requests synchronous writes. | |
1188 | * N.B. After this call fhp needs an fh_put | |
1189 | */ | |
6264d69d | 1190 | __be32 |
52e380e0 | 1191 | nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t offset, |
19e0663f TM |
1192 | struct kvec *vec, int vlen, unsigned long *cnt, int stable, |
1193 | __be32 *verf) | |
1da177e4 | 1194 | { |
b4935239 JL |
1195 | struct nfsd_file *nf; |
1196 | __be32 err; | |
1da177e4 | 1197 | |
f394b62b | 1198 | trace_nfsd_write_start(rqstp, fhp, offset, *cnt); |
6e8b50d1 | 1199 | |
4d1ea845 | 1200 | err = nfsd_file_acquire_gc(rqstp, fhp, NFSD_MAY_WRITE, &nf); |
52e380e0 KM |
1201 | if (err) |
1202 | goto out; | |
1203 | ||
16f8f894 | 1204 | err = nfsd_vfs_write(rqstp, fhp, nf, offset, vec, |
19e0663f | 1205 | vlen, cnt, stable, verf); |
b4935239 | 1206 | nfsd_file_put(nf); |
1da177e4 | 1207 | out: |
f394b62b | 1208 | trace_nfsd_write_done(rqstp, fhp, offset, *cnt); |
1da177e4 LT |
1209 | return err; |
1210 | } | |
1211 | ||
3f965021 CL |
1212 | /** |
1213 | * nfsd_commit - Commit pending writes to stable storage | |
1214 | * @rqstp: RPC request being processed | |
1215 | * @fhp: NFS filehandle | |
c2528490 | 1216 | * @nf: target file |
3f965021 CL |
1217 | * @offset: raw offset from beginning of file |
1218 | * @count: raw count of bytes to sync | |
1219 | * @verf: filled in with the server's current write verifier | |
aa696a6f | 1220 | * |
3f965021 CL |
1221 | * Note: we guarantee that data that lies within the range specified |
1222 | * by the 'offset' and 'count' parameters will be synced. The server | |
1223 | * is permitted to sync data that lies outside this range at the | |
1224 | * same time. | |
1da177e4 LT |
1225 | * |
1226 | * Unfortunately we cannot lock the file to make sure we return full WCC | |
1227 | * data to the client, as locking happens lower down in the filesystem. | |
3f965021 CL |
1228 | * |
1229 | * Return values: | |
1230 | * An nfsstat value in network byte order. | |
1da177e4 | 1231 | */ |
6264d69d | 1232 | __be32 |
c2528490 CL |
1233 | nfsd_commit(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf, |
1234 | u64 offset, u32 count, __be32 *verf) | |
1da177e4 | 1235 | { |
c2528490 | 1236 | __be32 err = nfs_ok; |
3f965021 CL |
1237 | u64 maxbytes; |
1238 | loff_t start, end; | |
2c445a0e | 1239 | struct nfsd_net *nn; |
3f965021 CL |
1240 | |
1241 | /* | |
1242 | * Convert the client-provided (offset, count) range to a | |
1243 | * (start, end) range. If the client-provided range falls | |
1244 | * outside the maximum file size of the underlying FS, | |
1245 | * clamp the sync range appropriately. | |
1246 | */ | |
1247 | start = 0; | |
1248 | end = LLONG_MAX; | |
1249 | maxbytes = (u64)fhp->fh_dentry->d_sb->s_maxbytes; | |
1250 | if (offset < maxbytes) { | |
1251 | start = offset; | |
1252 | if (count && (offset + count - 1 < maxbytes)) | |
1253 | end = offset + count - 1; | |
1254 | } | |
1255 | ||
2c445a0e | 1256 | nn = net_generic(nf->nf_net, nfsd_net_id); |
1da177e4 | 1257 | if (EX_ISSYNC(fhp->fh_export)) { |
555dbf1a TM |
1258 | errseq_t since = READ_ONCE(nf->nf_file->f_wb_err); |
1259 | int err2; | |
aa696a6f | 1260 | |
3f965021 | 1261 | err2 = vfs_fsync_range(nf->nf_file, start, end, 0); |
bbf2f098 TM |
1262 | switch (err2) { |
1263 | case 0: | |
3988a578 | 1264 | nfsd_copy_write_verifier(verf, nn); |
555dbf1a TM |
1265 | err2 = filemap_check_wb_err(nf->nf_file->f_mapping, |
1266 | since); | |
8a9ffb8c | 1267 | err = nfserrno(err2); |
bbf2f098 TM |
1268 | break; |
1269 | case -EINVAL: | |
1da177e4 | 1270 | err = nfserr_notsupp; |
bbf2f098 TM |
1271 | break; |
1272 | default: | |
3988a578 | 1273 | nfsd_reset_write_verifier(nn); |
75acacb6 | 1274 | trace_nfsd_writeverf_reset(nn, rqstp, err2); |
8a9ffb8c | 1275 | err = nfserrno(err2); |
bbf2f098 | 1276 | } |
524ff1af | 1277 | } else |
3988a578 | 1278 | nfsd_copy_write_verifier(verf, nn); |
1da177e4 | 1279 | |
1da177e4 LT |
1280 | return err; |
1281 | } | |
1da177e4 | 1282 | |
5f46e950 CL |
1283 | /** |
1284 | * nfsd_create_setattr - Set a created file's attributes | |
1285 | * @rqstp: RPC transaction being executed | |
1286 | * @fhp: NFS filehandle of parent directory | |
1287 | * @resfhp: NFS filehandle of new object | |
7fe2a71d | 1288 | * @attrs: requested attributes of new object |
5f46e950 CL |
1289 | * |
1290 | * Returns nfs_ok on success, or an nfsstat in network byte order. | |
1291 | */ | |
1292 | __be32 | |
1293 | nfsd_create_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
7fe2a71d | 1294 | struct svc_fh *resfhp, struct nfsd_attrs *attrs) |
5c002b3b | 1295 | { |
7fe2a71d | 1296 | struct iattr *iap = attrs->na_iattr; |
5f46e950 CL |
1297 | __be32 status; |
1298 | ||
5c002b3b | 1299 | /* |
5f46e950 | 1300 | * Mode has already been set by file creation. |
5c002b3b BF |
1301 | */ |
1302 | iap->ia_valid &= ~ATTR_MODE; | |
5f46e950 | 1303 | |
5c002b3b BF |
1304 | /* |
1305 | * Setting uid/gid works only for root. Irix appears to | |
1306 | * send along the gid on create when it tries to implement | |
1307 | * setgid directories via NFS: | |
1308 | */ | |
6fab8779 | 1309 | if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) |
5c002b3b | 1310 | iap->ia_valid &= ~(ATTR_UID|ATTR_GID); |
5f46e950 CL |
1311 | |
1312 | /* | |
1313 | * Callers expect new file metadata to be committed even | |
1314 | * if the attributes have not changed. | |
1315 | */ | |
5c002b3b | 1316 | if (iap->ia_valid) |
7fe2a71d | 1317 | status = nfsd_setattr(rqstp, resfhp, attrs, 0, (time64_t)0); |
5f46e950 CL |
1318 | else |
1319 | status = nfserrno(commit_metadata(resfhp)); | |
1320 | ||
1321 | /* | |
1322 | * Transactional filesystems had a chance to commit changes | |
1323 | * for both parent and child simultaneously making the | |
1324 | * following commit_metadata a noop in many cases. | |
1325 | */ | |
1326 | if (!status) | |
1327 | status = nfserrno(commit_metadata(fhp)); | |
1328 | ||
1329 | /* | |
1330 | * Update the new filehandle to pick up the new attributes. | |
1331 | */ | |
1332 | if (!status) | |
1333 | status = fh_update(resfhp); | |
1334 | ||
1335 | return status; | |
5c002b3b BF |
1336 | } |
1337 | ||
4ac35c2f | 1338 | /* HPUX client sometimes creates a file in mode 000, and sets size to 0. |
1339 | * setting size to 0 may fail for some specific file systems by the permission | |
1340 | * checking which requires WRITE permission but the mode is 000. | |
1341 | * we ignore the resizing(to 0) on the just new created file, since the size is | |
1342 | * 0 after file created. | |
1343 | * | |
1344 | * call this only after vfs_create() is called. | |
1345 | * */ | |
1346 | static void | |
1347 | nfsd_check_ignore_resizing(struct iattr *iap) | |
1348 | { | |
1349 | if ((iap->ia_valid & ATTR_SIZE) && (iap->ia_size == 0)) | |
1350 | iap->ia_valid &= ~ATTR_SIZE; | |
1351 | } | |
1352 | ||
b44061d0 | 1353 | /* The parent directory should already be locked: */ |
6264d69d | 1354 | __be32 |
b44061d0 | 1355 | nfsd_create_locked(struct svc_rqst *rqstp, struct svc_fh *fhp, |
9558f930 | 1356 | struct nfsd_attrs *attrs, |
7fe2a71d | 1357 | int type, dev_t rdev, struct svc_fh *resfhp) |
1da177e4 | 1358 | { |
2b118859 | 1359 | struct dentry *dentry, *dchild; |
1da177e4 | 1360 | struct inode *dirp; |
7fe2a71d | 1361 | struct iattr *iap = attrs->na_iattr; |
6264d69d AV |
1362 | __be32 err; |
1363 | int host_err; | |
1da177e4 | 1364 | |
1da177e4 | 1365 | dentry = fhp->fh_dentry; |
2b0143b5 | 1366 | dirp = d_inode(dentry); |
1da177e4 | 1367 | |
b44061d0 | 1368 | dchild = dget(resfhp->fh_dentry); |
7eed34f1 OD |
1369 | err = nfsd_permission(rqstp, fhp->fh_export, dentry, NFSD_MAY_CREATE); |
1370 | if (err) | |
1371 | goto out; | |
1372 | ||
1da177e4 LT |
1373 | if (!(iap->ia_valid & ATTR_MODE)) |
1374 | iap->ia_mode = 0; | |
1375 | iap->ia_mode = (iap->ia_mode & S_IALLUGO) | type; | |
1376 | ||
22cf8419 BF |
1377 | if (!IS_POSIXACL(dirp)) |
1378 | iap->ia_mode &= ~current_umask(); | |
1379 | ||
088406bc | 1380 | err = 0; |
1da177e4 LT |
1381 | switch (type) { |
1382 | case S_IFREG: | |
abf08576 CB |
1383 | host_err = vfs_create(&nop_mnt_idmap, dirp, dchild, |
1384 | iap->ia_mode, true); | |
4ac35c2f | 1385 | if (!host_err) |
1386 | nfsd_check_ignore_resizing(iap); | |
1da177e4 LT |
1387 | break; |
1388 | case S_IFDIR: | |
abf08576 | 1389 | host_err = vfs_mkdir(&nop_mnt_idmap, dirp, dchild, iap->ia_mode); |
3819bb0d AV |
1390 | if (!host_err && unlikely(d_unhashed(dchild))) { |
1391 | struct dentry *d; | |
1392 | d = lookup_one_len(dchild->d_name.name, | |
1393 | dchild->d_parent, | |
1394 | dchild->d_name.len); | |
1395 | if (IS_ERR(d)) { | |
1396 | host_err = PTR_ERR(d); | |
1397 | break; | |
1398 | } | |
1399 | if (unlikely(d_is_negative(d))) { | |
1400 | dput(d); | |
1401 | err = nfserr_serverfault; | |
1402 | goto out; | |
1403 | } | |
1404 | dput(resfhp->fh_dentry); | |
1405 | resfhp->fh_dentry = dget(d); | |
1406 | err = fh_update(resfhp); | |
1407 | dput(dchild); | |
1408 | dchild = d; | |
1409 | if (err) | |
1410 | goto out; | |
1411 | } | |
1da177e4 LT |
1412 | break; |
1413 | case S_IFCHR: | |
1414 | case S_IFBLK: | |
1415 | case S_IFIFO: | |
1416 | case S_IFSOCK: | |
abf08576 | 1417 | host_err = vfs_mknod(&nop_mnt_idmap, dirp, dchild, |
6521f891 | 1418 | iap->ia_mode, rdev); |
1da177e4 | 1419 | break; |
71423274 BF |
1420 | default: |
1421 | printk(KERN_WARNING "nfsd: bad file type %o in nfsd_create\n", | |
1422 | type); | |
1423 | host_err = -EINVAL; | |
1da177e4 | 1424 | } |
4a55c101 | 1425 | if (host_err < 0) |
1da177e4 LT |
1426 | goto out_nfserr; |
1427 | ||
7fe2a71d | 1428 | err = nfsd_create_setattr(rqstp, fhp, resfhp, attrs); |
1da177e4 | 1429 | |
1da177e4 | 1430 | out: |
2b118859 | 1431 | dput(dchild); |
1da177e4 LT |
1432 | return err; |
1433 | ||
1434 | out_nfserr: | |
6264d69d | 1435 | err = nfserrno(host_err); |
1da177e4 LT |
1436 | goto out; |
1437 | } | |
1438 | ||
b44061d0 BF |
1439 | /* |
1440 | * Create a filesystem object (regular, directory, special). | |
1441 | * Note that the parent directory is left locked. | |
1442 | * | |
1443 | * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp | |
1444 | */ | |
1445 | __be32 | |
1446 | nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp, | |
7fe2a71d N |
1447 | char *fname, int flen, struct nfsd_attrs *attrs, |
1448 | int type, dev_t rdev, struct svc_fh *resfhp) | |
b44061d0 BF |
1449 | { |
1450 | struct dentry *dentry, *dchild = NULL; | |
b44061d0 BF |
1451 | __be32 err; |
1452 | int host_err; | |
1453 | ||
1454 | if (isdotent(fname, flen)) | |
1455 | return nfserr_exist; | |
1456 | ||
fa08139d | 1457 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_NOP); |
b44061d0 BF |
1458 | if (err) |
1459 | return err; | |
1460 | ||
1461 | dentry = fhp->fh_dentry; | |
b44061d0 BF |
1462 | |
1463 | host_err = fh_want_write(fhp); | |
1464 | if (host_err) | |
1465 | return nfserrno(host_err); | |
1466 | ||
debf16f0 | 1467 | inode_lock_nested(dentry->d_inode, I_MUTEX_PARENT); |
b44061d0 BF |
1468 | dchild = lookup_one_len(fname, dentry, flen); |
1469 | host_err = PTR_ERR(dchild); | |
927bfc56 N |
1470 | if (IS_ERR(dchild)) { |
1471 | err = nfserrno(host_err); | |
1472 | goto out_unlock; | |
1473 | } | |
b44061d0 | 1474 | err = fh_compose(resfhp, fhp->fh_export, dchild, fhp); |
502aa0a5 JB |
1475 | /* |
1476 | * We unconditionally drop our ref to dchild as fh_compose will have | |
1477 | * already grabbed its own ref for it. | |
1478 | */ | |
1479 | dput(dchild); | |
1480 | if (err) | |
927bfc56 | 1481 | goto out_unlock; |
debf16f0 | 1482 | fh_fill_pre_attrs(fhp); |
9558f930 | 1483 | err = nfsd_create_locked(rqstp, fhp, attrs, type, rdev, resfhp); |
debf16f0 | 1484 | fh_fill_post_attrs(fhp); |
927bfc56 | 1485 | out_unlock: |
debf16f0 | 1486 | inode_unlock(dentry->d_inode); |
927bfc56 | 1487 | return err; |
b44061d0 BF |
1488 | } |
1489 | ||
1da177e4 LT |
1490 | /* |
1491 | * Read a symlink. On entry, *lenp must contain the maximum path length that | |
1492 | * fits into the buffer. On return, it contains the true length. | |
1493 | * N.B. After this call fhp needs an fh_put | |
1494 | */ | |
6264d69d | 1495 | __be32 |
1da177e4 LT |
1496 | nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp) |
1497 | { | |
6264d69d | 1498 | __be32 err; |
4d7edbc3 | 1499 | const char *link; |
68ac1234 | 1500 | struct path path; |
4d7edbc3 AV |
1501 | DEFINE_DELAYED_CALL(done); |
1502 | int len; | |
1da177e4 | 1503 | |
8837abca | 1504 | err = fh_verify(rqstp, fhp, S_IFLNK, NFSD_MAY_NOP); |
4d7edbc3 AV |
1505 | if (unlikely(err)) |
1506 | return err; | |
1da177e4 | 1507 | |
68ac1234 AV |
1508 | path.mnt = fhp->fh_export->ex_path.mnt; |
1509 | path.dentry = fhp->fh_dentry; | |
1da177e4 | 1510 | |
4d7edbc3 AV |
1511 | if (unlikely(!d_is_symlink(path.dentry))) |
1512 | return nfserr_inval; | |
1da177e4 | 1513 | |
68ac1234 | 1514 | touch_atime(&path); |
1da177e4 | 1515 | |
4d7edbc3 AV |
1516 | link = vfs_get_link(path.dentry, &done); |
1517 | if (IS_ERR(link)) | |
1518 | return nfserrno(PTR_ERR(link)); | |
1da177e4 | 1519 | |
4d7edbc3 AV |
1520 | len = strlen(link); |
1521 | if (len < *lenp) | |
1522 | *lenp = len; | |
1523 | memcpy(buf, link, *lenp); | |
1524 | do_delayed_call(&done); | |
1525 | return 0; | |
1da177e4 LT |
1526 | } |
1527 | ||
93adc1e3 N |
1528 | /** |
1529 | * nfsd_symlink - Create a symlink and look up its inode | |
1530 | * @rqstp: RPC transaction being executed | |
1531 | * @fhp: NFS filehandle of parent directory | |
1532 | * @fname: filename of the new symlink | |
1533 | * @flen: length of @fname | |
1534 | * @path: content of the new symlink (NUL-terminated) | |
1535 | * @attrs: requested attributes of new object | |
1536 | * @resfhp: NFS filehandle of new object | |
1537 | * | |
1da177e4 | 1538 | * N.B. After this call _both_ fhp and resfhp need an fh_put |
93adc1e3 N |
1539 | * |
1540 | * Returns nfs_ok on success, or an nfsstat in network byte order. | |
1da177e4 | 1541 | */ |
6264d69d | 1542 | __be32 |
1da177e4 | 1543 | nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp, |
93adc1e3 N |
1544 | char *fname, int flen, |
1545 | char *path, struct nfsd_attrs *attrs, | |
1546 | struct svc_fh *resfhp) | |
1da177e4 LT |
1547 | { |
1548 | struct dentry *dentry, *dnew; | |
6264d69d AV |
1549 | __be32 err, cerr; |
1550 | int host_err; | |
1da177e4 LT |
1551 | |
1552 | err = nfserr_noent; | |
52ee0433 | 1553 | if (!flen || path[0] == '\0') |
1da177e4 LT |
1554 | goto out; |
1555 | err = nfserr_exist; | |
1556 | if (isdotent(fname, flen)) | |
1557 | goto out; | |
1558 | ||
8837abca | 1559 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1560 | if (err) |
1561 | goto out; | |
4a55c101 JK |
1562 | |
1563 | host_err = fh_want_write(fhp); | |
927bfc56 N |
1564 | if (host_err) { |
1565 | err = nfserrno(host_err); | |
1566 | goto out; | |
1567 | } | |
4a55c101 | 1568 | |
1da177e4 | 1569 | dentry = fhp->fh_dentry; |
debf16f0 | 1570 | inode_lock_nested(dentry->d_inode, I_MUTEX_PARENT); |
1da177e4 | 1571 | dnew = lookup_one_len(fname, dentry, flen); |
927bfc56 N |
1572 | if (IS_ERR(dnew)) { |
1573 | err = nfserrno(PTR_ERR(dnew)); | |
debf16f0 | 1574 | inode_unlock(dentry->d_inode); |
927bfc56 N |
1575 | goto out_drop_write; |
1576 | } | |
debf16f0 | 1577 | fh_fill_pre_attrs(fhp); |
abf08576 | 1578 | host_err = vfs_symlink(&nop_mnt_idmap, d_inode(dentry), dnew, path); |
6264d69d | 1579 | err = nfserrno(host_err); |
93adc1e3 N |
1580 | cerr = fh_compose(resfhp, fhp->fh_export, dnew, fhp); |
1581 | if (!err) | |
1582 | nfsd_create_setattr(rqstp, fhp, resfhp, attrs); | |
debf16f0 N |
1583 | fh_fill_post_attrs(fhp); |
1584 | inode_unlock(dentry->d_inode); | |
f501912a BM |
1585 | if (!err) |
1586 | err = nfserrno(commit_metadata(fhp)); | |
1da177e4 LT |
1587 | dput(dnew); |
1588 | if (err==0) err = cerr; | |
927bfc56 N |
1589 | out_drop_write: |
1590 | fh_drop_write(fhp); | |
1da177e4 LT |
1591 | out: |
1592 | return err; | |
1da177e4 LT |
1593 | } |
1594 | ||
1595 | /* | |
1596 | * Create a hardlink | |
1597 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1598 | */ | |
6264d69d | 1599 | __be32 |
1da177e4 LT |
1600 | nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp, |
1601 | char *name, int len, struct svc_fh *tfhp) | |
1602 | { | |
1603 | struct dentry *ddir, *dnew, *dold; | |
55b13354 | 1604 | struct inode *dirp; |
6264d69d AV |
1605 | __be32 err; |
1606 | int host_err; | |
1da177e4 | 1607 | |
8837abca | 1608 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1609 | if (err) |
1610 | goto out; | |
7d818a7b | 1611 | err = fh_verify(rqstp, tfhp, 0, NFSD_MAY_NOP); |
1da177e4 LT |
1612 | if (err) |
1613 | goto out; | |
7d818a7b | 1614 | err = nfserr_isdir; |
e36cb0b8 | 1615 | if (d_is_dir(tfhp->fh_dentry)) |
7d818a7b | 1616 | goto out; |
1da177e4 LT |
1617 | err = nfserr_perm; |
1618 | if (!len) | |
1619 | goto out; | |
1620 | err = nfserr_exist; | |
1621 | if (isdotent(name, len)) | |
1622 | goto out; | |
1623 | ||
4a55c101 JK |
1624 | host_err = fh_want_write(tfhp); |
1625 | if (host_err) { | |
1626 | err = nfserrno(host_err); | |
1627 | goto out; | |
1628 | } | |
1629 | ||
1da177e4 | 1630 | ddir = ffhp->fh_dentry; |
2b0143b5 | 1631 | dirp = d_inode(ddir); |
debf16f0 | 1632 | inode_lock_nested(dirp, I_MUTEX_PARENT); |
1da177e4 LT |
1633 | |
1634 | dnew = lookup_one_len(name, ddir, len); | |
e18bcb33 N |
1635 | if (IS_ERR(dnew)) { |
1636 | err = nfserrno(PTR_ERR(dnew)); | |
1637 | goto out_unlock; | |
1638 | } | |
1da177e4 LT |
1639 | |
1640 | dold = tfhp->fh_dentry; | |
1da177e4 | 1641 | |
4795bb37 | 1642 | err = nfserr_noent; |
2b0143b5 | 1643 | if (d_really_is_negative(dold)) |
4a55c101 | 1644 | goto out_dput; |
debf16f0 | 1645 | fh_fill_pre_attrs(ffhp); |
abf08576 | 1646 | host_err = vfs_link(dold, &nop_mnt_idmap, dirp, dnew, NULL); |
debf16f0 N |
1647 | fh_fill_post_attrs(ffhp); |
1648 | inode_unlock(dirp); | |
6264d69d | 1649 | if (!host_err) { |
f501912a BM |
1650 | err = nfserrno(commit_metadata(ffhp)); |
1651 | if (!err) | |
1652 | err = nfserrno(commit_metadata(tfhp)); | |
1da177e4 | 1653 | } else { |
6264d69d | 1654 | if (host_err == -EXDEV && rqstp->rq_vers == 2) |
1da177e4 LT |
1655 | err = nfserr_acces; |
1656 | else | |
6264d69d | 1657 | err = nfserrno(host_err); |
1da177e4 | 1658 | } |
1da177e4 | 1659 | dput(dnew); |
e18bcb33 | 1660 | out_drop_write: |
4a55c101 | 1661 | fh_drop_write(tfhp); |
1da177e4 LT |
1662 | out: |
1663 | return err; | |
1664 | ||
e18bcb33 N |
1665 | out_dput: |
1666 | dput(dnew); | |
1667 | out_unlock: | |
debf16f0 | 1668 | inode_unlock(dirp); |
e18bcb33 | 1669 | goto out_drop_write; |
1da177e4 LT |
1670 | } |
1671 | ||
7775ec57 JL |
1672 | static void |
1673 | nfsd_close_cached_files(struct dentry *dentry) | |
1674 | { | |
1675 | struct inode *inode = d_inode(dentry); | |
1676 | ||
1677 | if (inode && S_ISREG(inode->i_mode)) | |
1678 | nfsd_file_close_inode_sync(inode); | |
1679 | } | |
1680 | ||
1681 | static bool | |
1682 | nfsd_has_cached_files(struct dentry *dentry) | |
1683 | { | |
1684 | bool ret = false; | |
1685 | struct inode *inode = d_inode(dentry); | |
1686 | ||
1687 | if (inode && S_ISREG(inode->i_mode)) | |
1688 | ret = nfsd_file_is_cached(inode); | |
1689 | return ret; | |
1690 | } | |
1691 | ||
1da177e4 LT |
1692 | /* |
1693 | * Rename a file | |
1694 | * N.B. After this call _both_ ffhp and tfhp need an fh_put | |
1695 | */ | |
6264d69d | 1696 | __be32 |
1da177e4 LT |
1697 | nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen, |
1698 | struct svc_fh *tfhp, char *tname, int tlen) | |
1699 | { | |
1700 | struct dentry *fdentry, *tdentry, *odentry, *ndentry, *trap; | |
1701 | struct inode *fdir, *tdir; | |
6264d69d AV |
1702 | __be32 err; |
1703 | int host_err; | |
7f84b488 | 1704 | bool close_cached = false; |
1da177e4 | 1705 | |
8837abca | 1706 | err = fh_verify(rqstp, ffhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1707 | if (err) |
1708 | goto out; | |
8837abca | 1709 | err = fh_verify(rqstp, tfhp, S_IFDIR, NFSD_MAY_CREATE); |
1da177e4 LT |
1710 | if (err) |
1711 | goto out; | |
1712 | ||
1713 | fdentry = ffhp->fh_dentry; | |
2b0143b5 | 1714 | fdir = d_inode(fdentry); |
1da177e4 LT |
1715 | |
1716 | tdentry = tfhp->fh_dentry; | |
2b0143b5 | 1717 | tdir = d_inode(tdentry); |
1da177e4 | 1718 | |
1da177e4 LT |
1719 | err = nfserr_perm; |
1720 | if (!flen || isdotent(fname, flen) || !tlen || isdotent(tname, tlen)) | |
1721 | goto out; | |
1722 | ||
7775ec57 | 1723 | retry: |
4a55c101 JK |
1724 | host_err = fh_want_write(ffhp); |
1725 | if (host_err) { | |
1726 | err = nfserrno(host_err); | |
1727 | goto out; | |
1728 | } | |
1729 | ||
1da177e4 | 1730 | trap = lock_rename(tdentry, fdentry); |
fcb5e3fa CL |
1731 | fh_fill_pre_attrs(ffhp); |
1732 | fh_fill_pre_attrs(tfhp); | |
1da177e4 LT |
1733 | |
1734 | odentry = lookup_one_len(fname, fdentry, flen); | |
6264d69d | 1735 | host_err = PTR_ERR(odentry); |
1da177e4 LT |
1736 | if (IS_ERR(odentry)) |
1737 | goto out_nfserr; | |
1738 | ||
6264d69d | 1739 | host_err = -ENOENT; |
2b0143b5 | 1740 | if (d_really_is_negative(odentry)) |
1da177e4 | 1741 | goto out_dput_old; |
6264d69d | 1742 | host_err = -EINVAL; |
1da177e4 LT |
1743 | if (odentry == trap) |
1744 | goto out_dput_old; | |
1745 | ||
1746 | ndentry = lookup_one_len(tname, tdentry, tlen); | |
6264d69d | 1747 | host_err = PTR_ERR(ndentry); |
1da177e4 LT |
1748 | if (IS_ERR(ndentry)) |
1749 | goto out_dput_old; | |
6264d69d | 1750 | host_err = -ENOTEMPTY; |
1da177e4 LT |
1751 | if (ndentry == trap) |
1752 | goto out_dput_new; | |
1753 | ||
9079b1eb DH |
1754 | host_err = -EXDEV; |
1755 | if (ffhp->fh_export->ex_path.mnt != tfhp->fh_export->ex_path.mnt) | |
1756 | goto out_dput_new; | |
aa387d6c BF |
1757 | if (ffhp->fh_export->ex_path.dentry != tfhp->fh_export->ex_path.dentry) |
1758 | goto out_dput_new; | |
9079b1eb | 1759 | |
7f84b488 JL |
1760 | if ((ndentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK) && |
1761 | nfsd_has_cached_files(ndentry)) { | |
1762 | close_cached = true; | |
7775ec57 JL |
1763 | goto out_dput_old; |
1764 | } else { | |
9fe61450 | 1765 | struct renamedata rd = { |
abf08576 | 1766 | .old_mnt_idmap = &nop_mnt_idmap, |
9fe61450 CB |
1767 | .old_dir = fdir, |
1768 | .old_dentry = odentry, | |
abf08576 | 1769 | .new_mnt_idmap = &nop_mnt_idmap, |
9fe61450 CB |
1770 | .new_dir = tdir, |
1771 | .new_dentry = ndentry, | |
1772 | }; | |
68c522af CL |
1773 | int retries; |
1774 | ||
1775 | for (retries = 1;;) { | |
1776 | host_err = vfs_rename(&rd); | |
1777 | if (host_err != -EAGAIN || !retries--) | |
1778 | break; | |
1779 | if (!nfsd_wait_for_delegreturn(rqstp, d_inode(odentry))) | |
1780 | break; | |
1781 | } | |
7775ec57 JL |
1782 | if (!host_err) { |
1783 | host_err = commit_metadata(tfhp); | |
1784 | if (!host_err) | |
1785 | host_err = commit_metadata(ffhp); | |
1786 | } | |
1da177e4 | 1787 | } |
1da177e4 LT |
1788 | out_dput_new: |
1789 | dput(ndentry); | |
1790 | out_dput_old: | |
1791 | dput(odentry); | |
1792 | out_nfserr: | |
6264d69d | 1793 | err = nfserrno(host_err); |
dd8dd403 | 1794 | |
7f84b488 | 1795 | if (!close_cached) { |
fcb5e3fa CL |
1796 | fh_fill_post_attrs(ffhp); |
1797 | fh_fill_post_attrs(tfhp); | |
7775ec57 | 1798 | } |
1da177e4 | 1799 | unlock_rename(tdentry, fdentry); |
4a55c101 | 1800 | fh_drop_write(ffhp); |
1da177e4 | 1801 | |
7775ec57 JL |
1802 | /* |
1803 | * If the target dentry has cached open files, then we need to try to | |
1804 | * close them prior to doing the rename. Flushing delayed fput | |
1805 | * shouldn't be done with locks held however, so we delay it until this | |
1806 | * point and then reattempt the whole shebang. | |
1807 | */ | |
7f84b488 JL |
1808 | if (close_cached) { |
1809 | close_cached = false; | |
7775ec57 JL |
1810 | nfsd_close_cached_files(ndentry); |
1811 | dput(ndentry); | |
1812 | goto retry; | |
1813 | } | |
1da177e4 LT |
1814 | out: |
1815 | return err; | |
1816 | } | |
1817 | ||
1818 | /* | |
1819 | * Unlink a file or directory | |
1820 | * N.B. After this call fhp needs an fh_put | |
1821 | */ | |
6264d69d | 1822 | __be32 |
1da177e4 LT |
1823 | nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, |
1824 | char *fname, int flen) | |
1825 | { | |
1826 | struct dentry *dentry, *rdentry; | |
1827 | struct inode *dirp; | |
e5d74a2d | 1828 | struct inode *rinode; |
6264d69d AV |
1829 | __be32 err; |
1830 | int host_err; | |
1da177e4 LT |
1831 | |
1832 | err = nfserr_acces; | |
1833 | if (!flen || isdotent(fname, flen)) | |
1834 | goto out; | |
8837abca | 1835 | err = fh_verify(rqstp, fhp, S_IFDIR, NFSD_MAY_REMOVE); |
1da177e4 LT |
1836 | if (err) |
1837 | goto out; | |
1838 | ||
4a55c101 JK |
1839 | host_err = fh_want_write(fhp); |
1840 | if (host_err) | |
1841 | goto out_nfserr; | |
1842 | ||
1da177e4 | 1843 | dentry = fhp->fh_dentry; |
2b0143b5 | 1844 | dirp = d_inode(dentry); |
debf16f0 | 1845 | inode_lock_nested(dirp, I_MUTEX_PARENT); |
1da177e4 LT |
1846 | |
1847 | rdentry = lookup_one_len(fname, dentry, flen); | |
6264d69d | 1848 | host_err = PTR_ERR(rdentry); |
1da177e4 | 1849 | if (IS_ERR(rdentry)) |
b677c0c6 | 1850 | goto out_unlock; |
1da177e4 | 1851 | |
2b0143b5 | 1852 | if (d_really_is_negative(rdentry)) { |
1da177e4 | 1853 | dput(rdentry); |
0ca0c9d7 | 1854 | host_err = -ENOENT; |
b677c0c6 | 1855 | goto out_unlock; |
1da177e4 | 1856 | } |
e5d74a2d YHH |
1857 | rinode = d_inode(rdentry); |
1858 | ihold(rinode); | |
1da177e4 LT |
1859 | |
1860 | if (!type) | |
2b0143b5 | 1861 | type = d_inode(rdentry)->i_mode & S_IFMT; |
1da177e4 | 1862 | |
debf16f0 | 1863 | fh_fill_pre_attrs(fhp); |
7775ec57 | 1864 | if (type != S_IFDIR) { |
5f5f8b6d CL |
1865 | int retries; |
1866 | ||
7f84b488 JL |
1867 | if (rdentry->d_sb->s_export_op->flags & EXPORT_OP_CLOSE_BEFORE_UNLINK) |
1868 | nfsd_close_cached_files(rdentry); | |
5f5f8b6d CL |
1869 | |
1870 | for (retries = 1;;) { | |
abf08576 | 1871 | host_err = vfs_unlink(&nop_mnt_idmap, dirp, rdentry, NULL); |
5f5f8b6d CL |
1872 | if (host_err != -EAGAIN || !retries--) |
1873 | break; | |
1874 | if (!nfsd_wait_for_delegreturn(rqstp, rinode)) | |
1875 | break; | |
1876 | } | |
7775ec57 | 1877 | } else { |
abf08576 | 1878 | host_err = vfs_rmdir(&nop_mnt_idmap, dirp, rdentry); |
7775ec57 | 1879 | } |
debf16f0 | 1880 | fh_fill_post_attrs(fhp); |
7775ec57 | 1881 | |
debf16f0 | 1882 | inode_unlock(dirp); |
f501912a BM |
1883 | if (!host_err) |
1884 | host_err = commit_metadata(fhp); | |
541ce98c | 1885 | dput(rdentry); |
e5d74a2d | 1886 | iput(rinode); /* truncate the inode here */ |
541ce98c | 1887 | |
0ca0c9d7 BF |
1888 | out_drop_write: |
1889 | fh_drop_write(fhp); | |
1da177e4 | 1890 | out_nfserr: |
466e16f0 N |
1891 | if (host_err == -EBUSY) { |
1892 | /* name is mounted-on. There is no perfect | |
1893 | * error status. | |
1894 | */ | |
1895 | if (nfsd_v4client(rqstp)) | |
1896 | err = nfserr_file_open; | |
1897 | else | |
1898 | err = nfserr_acces; | |
1899 | } else { | |
1900 | err = nfserrno(host_err); | |
1901 | } | |
f193fbab YT |
1902 | out: |
1903 | return err; | |
b677c0c6 | 1904 | out_unlock: |
debf16f0 | 1905 | inode_unlock(dirp); |
b677c0c6 | 1906 | goto out_drop_write; |
1da177e4 LT |
1907 | } |
1908 | ||
14f7dd63 DW |
1909 | /* |
1910 | * We do this buffering because we must not call back into the file | |
1911 | * system's ->lookup() method from the filldir callback. That may well | |
1912 | * deadlock a number of file systems. | |
1913 | * | |
1914 | * This is based heavily on the implementation of same in XFS. | |
1915 | */ | |
1916 | struct buffered_dirent { | |
1917 | u64 ino; | |
1918 | loff_t offset; | |
1919 | int namlen; | |
1920 | unsigned int d_type; | |
1921 | char name[]; | |
1922 | }; | |
1923 | ||
1924 | struct readdir_data { | |
5c0ba4e0 | 1925 | struct dir_context ctx; |
14f7dd63 DW |
1926 | char *dirent; |
1927 | size_t used; | |
53c9c5c0 | 1928 | int full; |
14f7dd63 DW |
1929 | }; |
1930 | ||
25885a35 | 1931 | static bool nfsd_buffered_filldir(struct dir_context *ctx, const char *name, |
ac7576f4 MS |
1932 | int namlen, loff_t offset, u64 ino, |
1933 | unsigned int d_type) | |
14f7dd63 | 1934 | { |
ac7576f4 MS |
1935 | struct readdir_data *buf = |
1936 | container_of(ctx, struct readdir_data, ctx); | |
14f7dd63 DW |
1937 | struct buffered_dirent *de = (void *)(buf->dirent + buf->used); |
1938 | unsigned int reclen; | |
1939 | ||
1940 | reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64)); | |
53c9c5c0 AV |
1941 | if (buf->used + reclen > PAGE_SIZE) { |
1942 | buf->full = 1; | |
25885a35 | 1943 | return false; |
53c9c5c0 | 1944 | } |
14f7dd63 DW |
1945 | |
1946 | de->namlen = namlen; | |
1947 | de->offset = offset; | |
1948 | de->ino = ino; | |
1949 | de->d_type = d_type; | |
1950 | memcpy(de->name, name, namlen); | |
1951 | buf->used += reclen; | |
1952 | ||
25885a35 | 1953 | return true; |
14f7dd63 DW |
1954 | } |
1955 | ||
6019ce07 CL |
1956 | static __be32 nfsd_buffered_readdir(struct file *file, struct svc_fh *fhp, |
1957 | nfsd_filldir_t func, struct readdir_cd *cdp, | |
1958 | loff_t *offsetp) | |
2628b766 | 1959 | { |
14f7dd63 | 1960 | struct buffered_dirent *de; |
2628b766 | 1961 | int host_err; |
14f7dd63 DW |
1962 | int size; |
1963 | loff_t offset; | |
ac6614b7 AV |
1964 | struct readdir_data buf = { |
1965 | .ctx.actor = nfsd_buffered_filldir, | |
1966 | .dirent = (void *)__get_free_page(GFP_KERNEL) | |
1967 | }; | |
2628b766 | 1968 | |
14f7dd63 | 1969 | if (!buf.dirent) |
2f9092e1 | 1970 | return nfserrno(-ENOMEM); |
14f7dd63 DW |
1971 | |
1972 | offset = *offsetp; | |
2628b766 | 1973 | |
14f7dd63 DW |
1974 | while (1) { |
1975 | unsigned int reclen; | |
1976 | ||
b726e923 | 1977 | cdp->err = nfserr_eof; /* will be cleared on successful read */ |
14f7dd63 | 1978 | buf.used = 0; |
53c9c5c0 | 1979 | buf.full = 0; |
14f7dd63 | 1980 | |
5c0ba4e0 | 1981 | host_err = iterate_dir(file, &buf.ctx); |
53c9c5c0 AV |
1982 | if (buf.full) |
1983 | host_err = 0; | |
1984 | ||
1985 | if (host_err < 0) | |
14f7dd63 DW |
1986 | break; |
1987 | ||
1988 | size = buf.used; | |
1989 | ||
1990 | if (!size) | |
1991 | break; | |
1992 | ||
14f7dd63 DW |
1993 | de = (struct buffered_dirent *)buf.dirent; |
1994 | while (size > 0) { | |
1995 | offset = de->offset; | |
1996 | ||
1997 | if (func(cdp, de->name, de->namlen, de->offset, | |
1998 | de->ino, de->d_type)) | |
2f9092e1 | 1999 | break; |
14f7dd63 DW |
2000 | |
2001 | if (cdp->err != nfs_ok) | |
2f9092e1 | 2002 | break; |
14f7dd63 | 2003 | |
6019ce07 CL |
2004 | trace_nfsd_dirent(fhp, de->ino, de->name, de->namlen); |
2005 | ||
14f7dd63 DW |
2006 | reclen = ALIGN(sizeof(*de) + de->namlen, |
2007 | sizeof(u64)); | |
2008 | size -= reclen; | |
2009 | de = (struct buffered_dirent *)((char *)de + reclen); | |
2010 | } | |
2f9092e1 DW |
2011 | if (size > 0) /* We bailed out early */ |
2012 | break; | |
2013 | ||
c002a6c7 | 2014 | offset = vfs_llseek(file, 0, SEEK_CUR); |
14f7dd63 DW |
2015 | } |
2016 | ||
14f7dd63 | 2017 | free_page((unsigned long)(buf.dirent)); |
2628b766 DW |
2018 | |
2019 | if (host_err) | |
2020 | return nfserrno(host_err); | |
14f7dd63 DW |
2021 | |
2022 | *offsetp = offset; | |
2023 | return cdp->err; | |
2628b766 DW |
2024 | } |
2025 | ||
1da177e4 LT |
2026 | /* |
2027 | * Read entries from a directory. | |
2028 | * The NFSv3/4 verifier we ignore for now. | |
2029 | */ | |
6264d69d | 2030 | __be32 |
1da177e4 | 2031 | nfsd_readdir(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t *offsetp, |
ac7576f4 | 2032 | struct readdir_cd *cdp, nfsd_filldir_t func) |
1da177e4 | 2033 | { |
6264d69d | 2034 | __be32 err; |
1da177e4 LT |
2035 | struct file *file; |
2036 | loff_t offset = *offsetp; | |
06effdbb BS |
2037 | int may_flags = NFSD_MAY_READ; |
2038 | ||
2039 | /* NFSv2 only supports 32 bit cookies */ | |
2040 | if (rqstp->rq_vers > 2) | |
2041 | may_flags |= NFSD_MAY_64BIT_COOKIE; | |
1da177e4 | 2042 | |
06effdbb | 2043 | err = nfsd_open(rqstp, fhp, S_IFDIR, may_flags, &file); |
1da177e4 LT |
2044 | if (err) |
2045 | goto out; | |
2046 | ||
b108fe6b | 2047 | offset = vfs_llseek(file, offset, SEEK_SET); |
1da177e4 LT |
2048 | if (offset < 0) { |
2049 | err = nfserrno((int)offset); | |
2050 | goto out_close; | |
2051 | } | |
2052 | ||
6019ce07 | 2053 | err = nfsd_buffered_readdir(file, fhp, func, cdp, offsetp); |
1da177e4 LT |
2054 | |
2055 | if (err == nfserr_eof || err == nfserr_toosmall) | |
2056 | err = nfs_ok; /* can still be found in ->err */ | |
2057 | out_close: | |
fd891454 | 2058 | fput(file); |
1da177e4 LT |
2059 | out: |
2060 | return err; | |
2061 | } | |
2062 | ||
2063 | /* | |
2064 | * Get file system stats | |
2065 | * N.B. After this call fhp needs an fh_put | |
2066 | */ | |
6264d69d | 2067 | __be32 |
04716e66 | 2068 | nfsd_statfs(struct svc_rqst *rqstp, struct svc_fh *fhp, struct kstatfs *stat, int access) |
1da177e4 | 2069 | { |
ebabe9a9 CH |
2070 | __be32 err; |
2071 | ||
2072 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_NOP | access); | |
f6360efb TI |
2073 | if (!err) { |
2074 | struct path path = { | |
2075 | .mnt = fhp->fh_export->ex_path.mnt, | |
2076 | .dentry = fhp->fh_dentry, | |
2077 | }; | |
2078 | if (vfs_statfs(&path, stat)) | |
2079 | err = nfserr_io; | |
2080 | } | |
1da177e4 LT |
2081 | return err; |
2082 | } | |
2083 | ||
c7d51402 | 2084 | static int exp_rdonly(struct svc_rqst *rqstp, struct svc_export *exp) |
e22841c6 | 2085 | { |
c7d51402 | 2086 | return nfsexp_flags(rqstp, exp) & NFSEXP_READONLY; |
e22841c6 BF |
2087 | } |
2088 | ||
32119446 FL |
2089 | #ifdef CONFIG_NFSD_V4 |
2090 | /* | |
2091 | * Helper function to translate error numbers. In the case of xattr operations, | |
2092 | * some error codes need to be translated outside of the standard translations. | |
2093 | * | |
2094 | * ENODATA needs to be translated to nfserr_noxattr. | |
2095 | * E2BIG to nfserr_xattr2big. | |
2096 | * | |
2097 | * Additionally, vfs_listxattr can return -ERANGE. This means that the | |
2098 | * file has too many extended attributes to retrieve inside an | |
2099 | * XATTR_LIST_MAX sized buffer. This is a bug in the xattr implementation: | |
2100 | * filesystems will allow the adding of extended attributes until they hit | |
2101 | * their own internal limit. This limit may be larger than XATTR_LIST_MAX. | |
2102 | * So, at that point, the attributes are present and valid, but can't | |
2103 | * be retrieved using listxattr, since the upper level xattr code enforces | |
2104 | * the XATTR_LIST_MAX limit. | |
2105 | * | |
2106 | * This bug means that we need to deal with listxattr returning -ERANGE. The | |
2107 | * best mapping is to return TOOSMALL. | |
2108 | */ | |
2109 | static __be32 | |
2110 | nfsd_xattr_errno(int err) | |
2111 | { | |
2112 | switch (err) { | |
2113 | case -ENODATA: | |
2114 | return nfserr_noxattr; | |
2115 | case -E2BIG: | |
2116 | return nfserr_xattr2big; | |
2117 | case -ERANGE: | |
2118 | return nfserr_toosmall; | |
2119 | } | |
2120 | return nfserrno(err); | |
2121 | } | |
2122 | ||
2123 | /* | |
2124 | * Retrieve the specified user extended attribute. To avoid always | |
2125 | * having to allocate the maximum size (since we are not getting | |
2126 | * a maximum size from the RPC), do a probe + alloc. Hold a reader | |
2127 | * lock on i_rwsem to prevent the extended attribute from changing | |
2128 | * size while we're doing this. | |
2129 | */ | |
2130 | __be32 | |
2131 | nfsd_getxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name, | |
2132 | void **bufp, int *lenp) | |
2133 | { | |
2134 | ssize_t len; | |
2135 | __be32 err; | |
2136 | char *buf; | |
2137 | struct inode *inode; | |
2138 | struct dentry *dentry; | |
2139 | ||
2140 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_READ); | |
2141 | if (err) | |
2142 | return err; | |
2143 | ||
2144 | err = nfs_ok; | |
2145 | dentry = fhp->fh_dentry; | |
2146 | inode = d_inode(dentry); | |
2147 | ||
2148 | inode_lock_shared(inode); | |
2149 | ||
4609e1f1 | 2150 | len = vfs_getxattr(&nop_mnt_idmap, dentry, name, NULL, 0); |
32119446 FL |
2151 | |
2152 | /* | |
2153 | * Zero-length attribute, just return. | |
2154 | */ | |
2155 | if (len == 0) { | |
2156 | *bufp = NULL; | |
2157 | *lenp = 0; | |
2158 | goto out; | |
2159 | } | |
2160 | ||
2161 | if (len < 0) { | |
2162 | err = nfsd_xattr_errno(len); | |
2163 | goto out; | |
2164 | } | |
2165 | ||
2166 | if (len > *lenp) { | |
2167 | err = nfserr_toosmall; | |
2168 | goto out; | |
2169 | } | |
2170 | ||
22b620ec | 2171 | buf = kvmalloc(len, GFP_KERNEL); |
32119446 FL |
2172 | if (buf == NULL) { |
2173 | err = nfserr_jukebox; | |
2174 | goto out; | |
2175 | } | |
2176 | ||
4609e1f1 | 2177 | len = vfs_getxattr(&nop_mnt_idmap, dentry, name, buf, len); |
32119446 FL |
2178 | if (len <= 0) { |
2179 | kvfree(buf); | |
2180 | buf = NULL; | |
2181 | err = nfsd_xattr_errno(len); | |
2182 | } | |
2183 | ||
2184 | *lenp = len; | |
2185 | *bufp = buf; | |
2186 | ||
2187 | out: | |
2188 | inode_unlock_shared(inode); | |
2189 | ||
2190 | return err; | |
2191 | } | |
2192 | ||
2193 | /* | |
2194 | * Retrieve the xattr names. Since we can't know how many are | |
2195 | * user extended attributes, we must get all attributes here, | |
2196 | * and have the XDR encode filter out the "user." ones. | |
2197 | * | |
2198 | * While this could always just allocate an XATTR_LIST_MAX | |
2199 | * buffer, that's a waste, so do a probe + allocate. To | |
2200 | * avoid any changes between the probe and allocate, wrap | |
2201 | * this in inode_lock. | |
2202 | */ | |
2203 | __be32 | |
2204 | nfsd_listxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char **bufp, | |
2205 | int *lenp) | |
2206 | { | |
2207 | ssize_t len; | |
2208 | __be32 err; | |
2209 | char *buf; | |
2210 | struct inode *inode; | |
2211 | struct dentry *dentry; | |
2212 | ||
2213 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_READ); | |
2214 | if (err) | |
2215 | return err; | |
2216 | ||
2217 | dentry = fhp->fh_dentry; | |
2218 | inode = d_inode(dentry); | |
2219 | *lenp = 0; | |
2220 | ||
2221 | inode_lock_shared(inode); | |
2222 | ||
2223 | len = vfs_listxattr(dentry, NULL, 0); | |
2224 | if (len <= 0) { | |
2225 | err = nfsd_xattr_errno(len); | |
2226 | goto out; | |
2227 | } | |
2228 | ||
2229 | if (len > XATTR_LIST_MAX) { | |
2230 | err = nfserr_xattr2big; | |
2231 | goto out; | |
2232 | } | |
2233 | ||
22b620ec | 2234 | buf = kvmalloc(len, GFP_KERNEL); |
32119446 FL |
2235 | if (buf == NULL) { |
2236 | err = nfserr_jukebox; | |
2237 | goto out; | |
2238 | } | |
2239 | ||
2240 | len = vfs_listxattr(dentry, buf, len); | |
2241 | if (len <= 0) { | |
2242 | kvfree(buf); | |
2243 | err = nfsd_xattr_errno(len); | |
2244 | goto out; | |
2245 | } | |
2246 | ||
2247 | *lenp = len; | |
2248 | *bufp = buf; | |
2249 | ||
2250 | err = nfs_ok; | |
2251 | out: | |
2252 | inode_unlock_shared(inode); | |
2253 | ||
2254 | return err; | |
2255 | } | |
2256 | ||
bb4d53d6 N |
2257 | /** |
2258 | * nfsd_removexattr - Remove an extended attribute | |
2259 | * @rqstp: RPC transaction being executed | |
2260 | * @fhp: NFS filehandle of object with xattr to remove | |
2261 | * @name: name of xattr to remove (NUL-terminate) | |
2262 | * | |
2263 | * Pass in a NULL pointer for delegated_inode, and let the client deal | |
2264 | * with NFS4ERR_DELAY (same as with e.g. setattr and remove). | |
2265 | * | |
2266 | * Returns nfs_ok on success, or an nfsstat in network byte order. | |
32119446 FL |
2267 | */ |
2268 | __be32 | |
2269 | nfsd_removexattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name) | |
2270 | { | |
8237284a CL |
2271 | __be32 err; |
2272 | int ret; | |
32119446 FL |
2273 | |
2274 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_WRITE); | |
2275 | if (err) | |
2276 | return err; | |
2277 | ||
2278 | ret = fh_want_write(fhp); | |
2279 | if (ret) | |
2280 | return nfserrno(ret); | |
2281 | ||
bb4d53d6 N |
2282 | inode_lock(fhp->fh_dentry->d_inode); |
2283 | fh_fill_pre_attrs(fhp); | |
32119446 | 2284 | |
4609e1f1 | 2285 | ret = __vfs_removexattr_locked(&nop_mnt_idmap, fhp->fh_dentry, |
c7c7a1a1 | 2286 | name, NULL); |
32119446 | 2287 | |
bb4d53d6 N |
2288 | fh_fill_post_attrs(fhp); |
2289 | inode_unlock(fhp->fh_dentry->d_inode); | |
32119446 FL |
2290 | fh_drop_write(fhp); |
2291 | ||
2292 | return nfsd_xattr_errno(ret); | |
2293 | } | |
2294 | ||
2295 | __be32 | |
2296 | nfsd_setxattr(struct svc_rqst *rqstp, struct svc_fh *fhp, char *name, | |
2297 | void *buf, u32 len, u32 flags) | |
2298 | { | |
8237284a CL |
2299 | __be32 err; |
2300 | int ret; | |
32119446 FL |
2301 | |
2302 | err = fh_verify(rqstp, fhp, 0, NFSD_MAY_WRITE); | |
2303 | if (err) | |
2304 | return err; | |
2305 | ||
2306 | ret = fh_want_write(fhp); | |
2307 | if (ret) | |
2308 | return nfserrno(ret); | |
bb4d53d6 N |
2309 | inode_lock(fhp->fh_dentry->d_inode); |
2310 | fh_fill_pre_attrs(fhp); | |
32119446 | 2311 | |
4609e1f1 | 2312 | ret = __vfs_setxattr_locked(&nop_mnt_idmap, fhp->fh_dentry, name, buf, |
c7c7a1a1 | 2313 | len, flags, NULL); |
bb4d53d6 N |
2314 | fh_fill_post_attrs(fhp); |
2315 | inode_unlock(fhp->fh_dentry->d_inode); | |
32119446 FL |
2316 | fh_drop_write(fhp); |
2317 | ||
2318 | return nfsd_xattr_errno(ret); | |
2319 | } | |
2320 | #endif | |
2321 | ||
1da177e4 LT |
2322 | /* |
2323 | * Check for a user's access permissions to this inode. | |
2324 | */ | |
6264d69d | 2325 | __be32 |
0ec757df BF |
2326 | nfsd_permission(struct svc_rqst *rqstp, struct svc_export *exp, |
2327 | struct dentry *dentry, int acc) | |
1da177e4 | 2328 | { |
2b0143b5 | 2329 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
2330 | int err; |
2331 | ||
aea93397 | 2332 | if ((acc & NFSD_MAY_MASK) == NFSD_MAY_NOP) |
1da177e4 LT |
2333 | return 0; |
2334 | #if 0 | |
2335 | dprintk("nfsd: permission 0x%x%s%s%s%s%s%s%s mode 0%o%s%s%s\n", | |
2336 | acc, | |
8837abca MS |
2337 | (acc & NFSD_MAY_READ)? " read" : "", |
2338 | (acc & NFSD_MAY_WRITE)? " write" : "", | |
2339 | (acc & NFSD_MAY_EXEC)? " exec" : "", | |
2340 | (acc & NFSD_MAY_SATTR)? " sattr" : "", | |
2341 | (acc & NFSD_MAY_TRUNC)? " trunc" : "", | |
2342 | (acc & NFSD_MAY_LOCK)? " lock" : "", | |
2343 | (acc & NFSD_MAY_OWNER_OVERRIDE)? " owneroverride" : "", | |
1da177e4 LT |
2344 | inode->i_mode, |
2345 | IS_IMMUTABLE(inode)? " immut" : "", | |
2346 | IS_APPEND(inode)? " append" : "", | |
2c463e95 | 2347 | __mnt_is_readonly(exp->ex_path.mnt)? " ro" : ""); |
1da177e4 | 2348 | dprintk(" owner %d/%d user %d/%d\n", |
5cc0a840 | 2349 | inode->i_uid, inode->i_gid, current_fsuid(), current_fsgid()); |
1da177e4 LT |
2350 | #endif |
2351 | ||
2352 | /* Normally we reject any write/sattr etc access on a read-only file | |
2353 | * system. But if it is IRIX doing check on write-access for a | |
2354 | * device special file, we ignore rofs. | |
2355 | */ | |
8837abca MS |
2356 | if (!(acc & NFSD_MAY_LOCAL_ACCESS)) |
2357 | if (acc & (NFSD_MAY_WRITE | NFSD_MAY_SATTR | NFSD_MAY_TRUNC)) { | |
2c463e95 DH |
2358 | if (exp_rdonly(rqstp, exp) || |
2359 | __mnt_is_readonly(exp->ex_path.mnt)) | |
1da177e4 | 2360 | return nfserr_rofs; |
8837abca | 2361 | if (/* (acc & NFSD_MAY_WRITE) && */ IS_IMMUTABLE(inode)) |
1da177e4 LT |
2362 | return nfserr_perm; |
2363 | } | |
8837abca | 2364 | if ((acc & NFSD_MAY_TRUNC) && IS_APPEND(inode)) |
1da177e4 LT |
2365 | return nfserr_perm; |
2366 | ||
8837abca | 2367 | if (acc & NFSD_MAY_LOCK) { |
1da177e4 LT |
2368 | /* If we cannot rely on authentication in NLM requests, |
2369 | * just allow locks, otherwise require read permission, or | |
2370 | * ownership | |
2371 | */ | |
2372 | if (exp->ex_flags & NFSEXP_NOAUTHNLM) | |
2373 | return 0; | |
2374 | else | |
8837abca | 2375 | acc = NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE; |
1da177e4 LT |
2376 | } |
2377 | /* | |
2378 | * The file owner always gets access permission for accesses that | |
2379 | * would normally be checked at open time. This is to make | |
2380 | * file access work even when the client has done a fchmod(fd, 0). | |
2381 | * | |
2382 | * However, `cp foo bar' should fail nevertheless when bar is | |
2383 | * readonly. A sensible way to do this might be to reject all | |
2384 | * attempts to truncate a read-only file, because a creat() call | |
2385 | * always implies file truncation. | |
2386 | * ... but this isn't really fair. A process may reasonably call | |
2387 | * ftruncate on an open file descriptor on a file with perm 000. | |
2388 | * We must trust the client to do permission checking - using "ACCESS" | |
2389 | * with NFSv3. | |
2390 | */ | |
8837abca | 2391 | if ((acc & NFSD_MAY_OWNER_OVERRIDE) && |
6fab8779 | 2392 | uid_eq(inode->i_uid, current_fsuid())) |
1da177e4 LT |
2393 | return 0; |
2394 | ||
8837abca | 2395 | /* This assumes NFSD_MAY_{READ,WRITE,EXEC} == MAY_{READ,WRITE,EXEC} */ |
4609e1f1 | 2396 | err = inode_permission(&nop_mnt_idmap, inode, |
47291baa | 2397 | acc & (MAY_READ | MAY_WRITE | MAY_EXEC)); |
1da177e4 LT |
2398 | |
2399 | /* Allow read access to binaries even when mode 111 */ | |
2400 | if (err == -EACCES && S_ISREG(inode->i_mode) && | |
a043226b BF |
2401 | (acc == (NFSD_MAY_READ | NFSD_MAY_OWNER_OVERRIDE) || |
2402 | acc == (NFSD_MAY_READ | NFSD_MAY_READ_IF_EXEC))) | |
4609e1f1 | 2403 | err = inode_permission(&nop_mnt_idmap, inode, MAY_EXEC); |
1da177e4 LT |
2404 | |
2405 | return err? nfserrno(err) : 0; | |
2406 | } |