Commit | Line | Data |
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1f327613 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
2bad8471 | 2 | /* |
73c592b9 | 3 | * This file contains vfs inode ops for the 9P2000 protocol. |
2bad8471 EVH |
4 | * |
5 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
6 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
2bad8471 EVH |
7 | */ |
8 | ||
5d385153 JP |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
2bad8471 EVH |
11 | #include <linux/module.h> |
12 | #include <linux/errno.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/file.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/stat.h> | |
17 | #include <linux/string.h> | |
2bad8471 | 18 | #include <linux/namei.h> |
e8edc6e0 | 19 | #include <linux/sched.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
ebf46264 | 21 | #include <linux/xattr.h> |
85ff872d | 22 | #include <linux/posix_acl.h> |
bd238fb4 LI |
23 | #include <net/9p/9p.h> |
24 | #include <net/9p/client.h> | |
2bad8471 | 25 | |
2bad8471 | 26 | #include "v9fs.h" |
2bad8471 | 27 | #include "v9fs_vfs.h" |
2bad8471 | 28 | #include "fid.h" |
60e78d2c | 29 | #include "cache.h" |
ebf46264 | 30 | #include "xattr.h" |
85ff872d | 31 | #include "acl.h" |
2bad8471 | 32 | |
754661f1 | 33 | static const struct inode_operations v9fs_dir_inode_operations; |
9b6533c9 | 34 | static const struct inode_operations v9fs_dir_inode_operations_dotu; |
754661f1 AV |
35 | static const struct inode_operations v9fs_file_inode_operations; |
36 | static const struct inode_operations v9fs_symlink_inode_operations; | |
f5fc6145 | 37 | |
2bad8471 EVH |
38 | /** |
39 | * unixmode2p9mode - convert unix mode bits to plan 9 | |
40 | * @v9ses: v9fs session information | |
41 | * @mode: mode to convert | |
42 | * | |
43 | */ | |
44 | ||
3eda0de6 | 45 | static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) |
2bad8471 EVH |
46 | { |
47 | int res; | |
6e195b0f | 48 | |
2bad8471 EVH |
49 | res = mode & 0777; |
50 | if (S_ISDIR(mode)) | |
bd238fb4 | 51 | res |= P9_DMDIR; |
dd6102fb | 52 | if (v9fs_proto_dotu(v9ses)) { |
2bad8471 EVH |
53 | if (v9ses->nodev == 0) { |
54 | if (S_ISSOCK(mode)) | |
bd238fb4 | 55 | res |= P9_DMSOCKET; |
2bad8471 | 56 | if (S_ISFIFO(mode)) |
bd238fb4 | 57 | res |= P9_DMNAMEDPIPE; |
2bad8471 | 58 | if (S_ISBLK(mode)) |
bd238fb4 | 59 | res |= P9_DMDEVICE; |
2bad8471 | 60 | if (S_ISCHR(mode)) |
bd238fb4 | 61 | res |= P9_DMDEVICE; |
2bad8471 EVH |
62 | } |
63 | ||
64 | if ((mode & S_ISUID) == S_ISUID) | |
bd238fb4 | 65 | res |= P9_DMSETUID; |
2bad8471 | 66 | if ((mode & S_ISGID) == S_ISGID) |
bd238fb4 | 67 | res |= P9_DMSETGID; |
d199d652 AL |
68 | if ((mode & S_ISVTX) == S_ISVTX) |
69 | res |= P9_DMSETVTX; | |
2bad8471 | 70 | } |
2bad8471 EVH |
71 | return res; |
72 | } | |
73 | ||
df345c67 AK |
74 | /** |
75 | * p9mode2perm- convert plan9 mode bits to unix permission bits | |
76 | * @v9ses: v9fs session information | |
77 | * @stat: p9_wstat from which mode need to be derived | |
78 | * | |
79 | */ | |
80 | static int p9mode2perm(struct v9fs_session_info *v9ses, | |
81 | struct p9_wstat *stat) | |
82 | { | |
83 | int res; | |
84 | int mode = stat->mode; | |
85 | ||
cd25e15e | 86 | res = mode & 0777; /* S_IRWXUGO */ |
df345c67 AK |
87 | if (v9fs_proto_dotu(v9ses)) { |
88 | if ((mode & P9_DMSETUID) == P9_DMSETUID) | |
89 | res |= S_ISUID; | |
90 | ||
91 | if ((mode & P9_DMSETGID) == P9_DMSETGID) | |
92 | res |= S_ISGID; | |
93 | ||
94 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) | |
95 | res |= S_ISVTX; | |
96 | } | |
97 | return res; | |
98 | } | |
99 | ||
2bad8471 EVH |
100 | /** |
101 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits | |
102 | * @v9ses: v9fs session information | |
45089142 AK |
103 | * @stat: p9_wstat from which mode need to be derived |
104 | * @rdev: major number, minor number in case of device files. | |
2bad8471 EVH |
105 | * |
106 | */ | |
3eda0de6 AV |
107 | static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, |
108 | struct p9_wstat *stat, dev_t *rdev) | |
2bad8471 | 109 | { |
05f975cd | 110 | int res, r; |
3eda0de6 | 111 | u32 mode = stat->mode; |
2bad8471 | 112 | |
45089142 | 113 | *rdev = 0; |
df345c67 | 114 | res = p9mode2perm(v9ses, stat); |
2bad8471 | 115 | |
bd238fb4 | 116 | if ((mode & P9_DMDIR) == P9_DMDIR) |
2bad8471 | 117 | res |= S_IFDIR; |
dd6102fb | 118 | else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
2bad8471 | 119 | res |= S_IFLNK; |
dd6102fb | 120 | else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
121 | && (v9ses->nodev == 0)) |
122 | res |= S_IFSOCK; | |
dd6102fb | 123 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
2bad8471 EVH |
124 | && (v9ses->nodev == 0)) |
125 | res |= S_IFIFO; | |
dd6102fb | 126 | else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
45089142 | 127 | && (v9ses->nodev == 0)) { |
05f975cd | 128 | char type = 0; |
45089142 AK |
129 | int major = -1, minor = -1; |
130 | ||
05f975cd DM |
131 | r = sscanf(stat->extension, "%c %i %i", &type, &major, &minor); |
132 | if (r != 3) { | |
133 | p9_debug(P9_DEBUG_ERROR, | |
134 | "invalid device string, umode will be bogus: %s\n", | |
135 | stat->extension); | |
136 | return res; | |
137 | } | |
45089142 AK |
138 | switch (type) { |
139 | case 'c': | |
140 | res |= S_IFCHR; | |
141 | break; | |
142 | case 'b': | |
143 | res |= S_IFBLK; | |
144 | break; | |
145 | default: | |
5d385153 JP |
146 | p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", |
147 | type, stat->extension); | |
51958817 | 148 | } |
45089142 AK |
149 | *rdev = MKDEV(major, minor); |
150 | } else | |
2bad8471 EVH |
151 | res |= S_IFREG; |
152 | ||
2bad8471 EVH |
153 | return res; |
154 | } | |
155 | ||
ee443996 EVH |
156 | /** |
157 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits | |
158 | * @uflags: flags to convert | |
2e4bef41 | 159 | * @extended: if .u extensions are active |
ee443996 EVH |
160 | */ |
161 | ||
2e4bef41 | 162 | int v9fs_uflags2omode(int uflags, int extended) |
6a3124a3 LI |
163 | { |
164 | int ret; | |
165 | ||
6a3124a3 LI |
166 | switch (uflags&3) { |
167 | default: | |
168 | case O_RDONLY: | |
bd238fb4 | 169 | ret = P9_OREAD; |
6a3124a3 LI |
170 | break; |
171 | ||
172 | case O_WRONLY: | |
bd238fb4 | 173 | ret = P9_OWRITE; |
6a3124a3 LI |
174 | break; |
175 | ||
176 | case O_RDWR: | |
bd238fb4 | 177 | ret = P9_ORDWR; |
6a3124a3 LI |
178 | break; |
179 | } | |
180 | ||
87de39e7 JS |
181 | if (uflags & O_TRUNC) |
182 | ret |= P9_OTRUNC; | |
183 | ||
2e4bef41 EVH |
184 | if (extended) { |
185 | if (uflags & O_EXCL) | |
186 | ret |= P9_OEXCL; | |
187 | ||
188 | if (uflags & O_APPEND) | |
189 | ret |= P9_OAPPEND; | |
190 | } | |
6a3124a3 LI |
191 | |
192 | return ret; | |
193 | } | |
194 | ||
2bad8471 | 195 | /** |
531b1094 | 196 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
531b1094 | 197 | * @wstat: structure to initialize |
2bad8471 EVH |
198 | * |
199 | */ | |
200 | ||
7a4439c4 | 201 | void |
bd238fb4 | 202 | v9fs_blank_wstat(struct p9_wstat *wstat) |
2bad8471 | 203 | { |
531b1094 LI |
204 | wstat->type = ~0; |
205 | wstat->dev = ~0; | |
206 | wstat->qid.type = ~0; | |
207 | wstat->qid.version = ~0; | |
208 | *((long long *)&wstat->qid.path) = ~0; | |
209 | wstat->mode = ~0; | |
210 | wstat->atime = ~0; | |
211 | wstat->mtime = ~0; | |
212 | wstat->length = ~0; | |
213 | wstat->name = NULL; | |
214 | wstat->uid = NULL; | |
215 | wstat->gid = NULL; | |
216 | wstat->muid = NULL; | |
447c5094 EB |
217 | wstat->n_uid = INVALID_UID; |
218 | wstat->n_gid = INVALID_GID; | |
219 | wstat->n_muid = INVALID_UID; | |
531b1094 | 220 | wstat->extension = NULL; |
2bad8471 EVH |
221 | } |
222 | ||
60e78d2c AK |
223 | /** |
224 | * v9fs_alloc_inode - helper function to allocate an inode | |
bc868036 | 225 | * @sb: The superblock to allocate the inode from |
60e78d2c | 226 | */ |
60e78d2c AK |
227 | struct inode *v9fs_alloc_inode(struct super_block *sb) |
228 | { | |
a78ce05d | 229 | struct v9fs_inode *v9inode; |
6e195b0f | 230 | |
fd60b288 | 231 | v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL); |
a78ce05d | 232 | if (!v9inode) |
60e78d2c | 233 | return NULL; |
b3cbea03 | 234 | v9inode->cache_validity = 0; |
5a7e0a8c | 235 | mutex_init(&v9inode->v_mutex); |
874c8ca1 | 236 | return &v9inode->netfs.inode; |
60e78d2c AK |
237 | } |
238 | ||
239 | /** | |
5e8a0770 | 240 | * v9fs_free_inode - destroy an inode |
bc868036 | 241 | * @inode: The inode to be freed |
60e78d2c AK |
242 | */ |
243 | ||
5e8a0770 | 244 | void v9fs_free_inode(struct inode *inode) |
60e78d2c | 245 | { |
a78ce05d | 246 | kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); |
60e78d2c | 247 | } |
fa0d7e3d | 248 | |
bc899ee1 DH |
249 | /* |
250 | * Set parameters for the netfs library | |
251 | */ | |
9546ac78 | 252 | void v9fs_set_netfs_context(struct inode *inode) |
bc899ee1 | 253 | { |
e81fb419 | 254 | struct v9fs_inode *v9inode = V9FS_I(inode); |
100ccd18 | 255 | netfs_inode_init(&v9inode->netfs, &v9fs_req_ops, true); |
bc899ee1 DH |
256 | } |
257 | ||
5ffc0cb3 | 258 | int v9fs_init_inode(struct v9fs_session_info *v9ses, |
724a0845 | 259 | struct inode *inode, struct p9_qid *qid, umode_t mode, dev_t rdev) |
2bad8471 | 260 | { |
5ffc0cb3 | 261 | int err = 0; |
724a0845 EVH |
262 | struct v9fs_inode *v9inode = V9FS_I(inode); |
263 | ||
264 | memcpy(&v9inode->qid, qid, sizeof(struct p9_qid)); | |
2bb54115 | 265 | |
f2d40141 | 266 | inode_init_owner(&nop_mnt_idmap, inode, NULL, mode); |
2bb54115 | 267 | inode->i_blocks = 0; |
45089142 | 268 | inode->i_rdev = rdev; |
d0242a3a | 269 | simple_inode_init_ts(inode); |
2bb54115 | 270 | inode->i_mapping->a_ops = &v9fs_addr_operations; |
987a6485 | 271 | inode->i_private = NULL; |
2bb54115 AK |
272 | |
273 | switch (mode & S_IFMT) { | |
274 | case S_IFIFO: | |
275 | case S_IFBLK: | |
276 | case S_IFCHR: | |
277 | case S_IFSOCK: | |
4b43516a MK |
278 | if (v9fs_proto_dotl(v9ses)) { |
279 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
4b43516a MK |
280 | } else if (v9fs_proto_dotu(v9ses)) { |
281 | inode->i_op = &v9fs_file_inode_operations; | |
4b43516a | 282 | } else { |
5d385153 JP |
283 | p9_debug(P9_DEBUG_ERROR, |
284 | "special files without extended mode\n"); | |
2bb54115 AK |
285 | err = -EINVAL; |
286 | goto error; | |
2bad8471 | 287 | } |
2bb54115 AK |
288 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
289 | break; | |
290 | case S_IFREG: | |
9b6533c9 SK |
291 | if (v9fs_proto_dotl(v9ses)) { |
292 | inode->i_op = &v9fs_file_inode_operations_dotl; | |
d9bc0d11 | 293 | inode->i_fop = &v9fs_file_operations_dotl; |
9b6533c9 SK |
294 | } else { |
295 | inode->i_op = &v9fs_file_inode_operations; | |
d9bc0d11 | 296 | inode->i_fop = &v9fs_file_operations; |
9b6533c9 SK |
297 | } |
298 | ||
2bb54115 AK |
299 | break; |
300 | case S_IFLNK: | |
9b6533c9 | 301 | if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
5d385153 JP |
302 | p9_debug(P9_DEBUG_ERROR, |
303 | "extended modes used with legacy protocol\n"); | |
2bb54115 AK |
304 | err = -EINVAL; |
305 | goto error; | |
306 | } | |
9b6533c9 SK |
307 | |
308 | if (v9fs_proto_dotl(v9ses)) | |
309 | inode->i_op = &v9fs_symlink_inode_operations_dotl; | |
310 | else | |
311 | inode->i_op = &v9fs_symlink_inode_operations; | |
312 | ||
2bb54115 AK |
313 | break; |
314 | case S_IFDIR: | |
315 | inc_nlink(inode); | |
9b6533c9 SK |
316 | if (v9fs_proto_dotl(v9ses)) |
317 | inode->i_op = &v9fs_dir_inode_operations_dotl; | |
318 | else if (v9fs_proto_dotu(v9ses)) | |
319 | inode->i_op = &v9fs_dir_inode_operations_dotu; | |
2bb54115 AK |
320 | else |
321 | inode->i_op = &v9fs_dir_inode_operations; | |
9b6533c9 SK |
322 | |
323 | if (v9fs_proto_dotl(v9ses)) | |
324 | inode->i_fop = &v9fs_dir_operations_dotl; | |
325 | else | |
326 | inode->i_fop = &v9fs_dir_operations; | |
327 | ||
2bb54115 AK |
328 | break; |
329 | default: | |
609eac1c | 330 | p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", |
5d385153 | 331 | mode, mode & S_IFMT); |
2bb54115 AK |
332 | err = -EINVAL; |
333 | goto error; | |
2bad8471 | 334 | } |
5ffc0cb3 AK |
335 | error: |
336 | return err; | |
2bb54115 | 337 | |
5ffc0cb3 | 338 | } |
2bb54115 | 339 | |
60e78d2c | 340 | /** |
bc868036 | 341 | * v9fs_evict_inode - Remove an inode from the inode cache |
60e78d2c AK |
342 | * @inode: inode to release |
343 | * | |
344 | */ | |
b57922d9 | 345 | void v9fs_evict_inode(struct inode *inode) |
60e78d2c | 346 | { |
4eb31178 EVH |
347 | struct v9fs_inode __maybe_unused *v9inode = V9FS_I(inode); |
348 | __le32 __maybe_unused version; | |
6b39f6d2 | 349 | |
6630036b EVH |
350 | if (!is_bad_inode(inode)) { |
351 | truncate_inode_pages_final(&inode->i_data); | |
4eb31178 | 352 | |
6630036b EVH |
353 | version = cpu_to_le32(v9inode->qid.version); |
354 | netfs_clear_inode_writeback(inode, &version); | |
4eb31178 | 355 | |
6630036b EVH |
356 | clear_inode(inode); |
357 | filemap_fdatawrite(&inode->i_data); | |
60e78d2c | 358 | |
4eb31178 | 359 | #ifdef CONFIG_9P_FSCACHE |
6630036b EVH |
360 | if (v9fs_inode_cookie(v9inode)) |
361 | fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false); | |
4eb31178 | 362 | #endif |
6630036b EVH |
363 | } else |
364 | clear_inode(inode); | |
60e78d2c AK |
365 | } |
366 | ||
724a0845 | 367 | struct inode *v9fs_fid_iget(struct super_block *sb, struct p9_fid *fid) |
6a3124a3 | 368 | { |
45089142 | 369 | dev_t rdev; |
3eda0de6 AV |
370 | int retval; |
371 | umode_t umode; | |
5ffc0cb3 | 372 | struct inode *inode; |
724a0845 | 373 | struct p9_wstat *st; |
5ffc0cb3 | 374 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
ed80fcfa | 375 | |
724a0845 EVH |
376 | inode = iget_locked(sb, QID2INO(&fid->qid)); |
377 | if (unlikely(!inode)) | |
5ffc0cb3 AK |
378 | return ERR_PTR(-ENOMEM); |
379 | if (!(inode->i_state & I_NEW)) | |
380 | return inode; | |
724a0845 | 381 | |
5ffc0cb3 AK |
382 | /* |
383 | * initialize the inode with the stat info | |
384 | * FIXME!! we may need support for stale inodes | |
385 | * later. | |
386 | */ | |
724a0845 EVH |
387 | st = p9_client_stat(fid); |
388 | if (IS_ERR(st)) { | |
389 | retval = PTR_ERR(st); | |
390 | goto error; | |
391 | } | |
392 | ||
45089142 | 393 | umode = p9mode2unixmode(v9ses, st, &rdev); |
724a0845 EVH |
394 | retval = v9fs_init_inode(v9ses, inode, &fid->qid, umode, rdev); |
395 | v9fs_stat2inode(st, inode, sb, 0); | |
396 | p9stat_free(st); | |
397 | kfree(st); | |
5ffc0cb3 | 398 | if (retval) |
6a3124a3 | 399 | goto error; |
60e78d2c | 400 | |
9546ac78 | 401 | v9fs_set_netfs_context(inode); |
5ffc0cb3 | 402 | v9fs_cache_inode_get_cookie(inode); |
5ffc0cb3 AK |
403 | unlock_new_inode(inode); |
404 | return inode; | |
6a3124a3 | 405 | error: |
0a73d0a2 | 406 | iget_failed(inode); |
5ffc0cb3 AK |
407 | return ERR_PTR(retval); |
408 | ||
409 | } | |
410 | ||
f88657ce AK |
411 | /** |
412 | * v9fs_at_to_dotl_flags- convert Linux specific AT flags to | |
413 | * plan 9 AT flag. | |
414 | * @flags: flags to convert | |
415 | */ | |
416 | static int v9fs_at_to_dotl_flags(int flags) | |
417 | { | |
418 | int rflags = 0; | |
6e195b0f | 419 | |
f88657ce AK |
420 | if (flags & AT_REMOVEDIR) |
421 | rflags |= P9_DOTL_AT_REMOVEDIR; | |
6e195b0f | 422 | |
f88657ce AK |
423 | return rflags; |
424 | } | |
425 | ||
ac89b2ef EG |
426 | /** |
427 | * v9fs_dec_count - helper functon to drop i_nlink. | |
428 | * | |
429 | * If a directory had nlink <= 2 (including . and ..), then we should not drop | |
430 | * the link count, which indicates the underlying exported fs doesn't maintain | |
431 | * nlink accurately. e.g. | |
432 | * - overlayfs sets nlink to 1 for merged dir | |
433 | * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more | |
434 | * than EXT4_LINK_MAX (65000) links. | |
435 | * | |
436 | * @inode: inode whose nlink is being dropped | |
437 | */ | |
438 | static void v9fs_dec_count(struct inode *inode) | |
439 | { | |
440 | if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) | |
441 | drop_nlink(inode); | |
442 | } | |
443 | ||
2bad8471 EVH |
444 | /** |
445 | * v9fs_remove - helper function to remove files and directories | |
73c592b9 | 446 | * @dir: directory inode that is being deleted |
48e370ff | 447 | * @dentry: dentry that is being deleted |
fd2916bd | 448 | * @flags: removing a directory |
2bad8471 EVH |
449 | * |
450 | */ | |
451 | ||
48e370ff | 452 | static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) |
2bad8471 | 453 | { |
48e370ff AK |
454 | struct inode *inode; |
455 | int retval = -EOPNOTSUPP; | |
456 | struct p9_fid *v9fid, *dfid; | |
457 | struct v9fs_session_info *v9ses; | |
2bad8471 | 458 | |
5d385153 JP |
459 | p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", |
460 | dir, dentry, flags); | |
2bad8471 | 461 | |
48e370ff | 462 | v9ses = v9fs_inode2v9ses(dir); |
2b0143b5 | 463 | inode = d_inode(dentry); |
77d5a6b7 | 464 | dfid = v9fs_parent_fid(dentry); |
48e370ff AK |
465 | if (IS_ERR(dfid)) { |
466 | retval = PTR_ERR(dfid); | |
5d385153 | 467 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); |
48e370ff AK |
468 | return retval; |
469 | } | |
470 | if (v9fs_proto_dotl(v9ses)) | |
f88657ce AK |
471 | retval = p9_client_unlinkat(dfid, dentry->d_name.name, |
472 | v9fs_at_to_dotl_flags(flags)); | |
b48dbb99 | 473 | p9_fid_put(dfid); |
48e370ff AK |
474 | if (retval == -EOPNOTSUPP) { |
475 | /* Try the one based on path */ | |
476 | v9fid = v9fs_fid_clone(dentry); | |
477 | if (IS_ERR(v9fid)) | |
478 | return PTR_ERR(v9fid); | |
479 | retval = p9_client_remove(v9fid); | |
480 | } | |
b271ec47 AK |
481 | if (!retval) { |
482 | /* | |
483 | * directories on unlink should have zero | |
484 | * link count | |
485 | */ | |
48e370ff AK |
486 | if (flags & AT_REMOVEDIR) { |
487 | clear_nlink(inode); | |
ac89b2ef | 488 | v9fs_dec_count(dir); |
b271ec47 | 489 | } else |
ac89b2ef | 490 | v9fs_dec_count(inode); |
d28c61f0 | 491 | |
48e370ff | 492 | v9fs_invalidate_inode_attr(inode); |
d28c61f0 | 493 | v9fs_invalidate_inode_attr(dir); |
154372e6 EVH |
494 | |
495 | /* invalidate all fids associated with dentry */ | |
496 | /* NOTE: This will not include open fids */ | |
497 | dentry->d_op->d_release(dentry); | |
b271ec47 | 498 | } |
d994f405 | 499 | return retval; |
2bad8471 EVH |
500 | } |
501 | ||
502 | /** | |
bd238fb4 | 503 | * v9fs_create - Create a file |
ee443996 EVH |
504 | * @v9ses: session information |
505 | * @dir: directory that dentry is being created in | |
bd238fb4 | 506 | * @dentry: dentry that is being created |
0e15597e | 507 | * @extension: 9p2000.u extension string to support devices, etc. |
bd238fb4 LI |
508 | * @perm: create permissions |
509 | * @mode: open mode | |
2bad8471 EVH |
510 | * |
511 | */ | |
bd238fb4 LI |
512 | static struct p9_fid * |
513 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, | |
514 | struct dentry *dentry, char *extension, u32 perm, u8 mode) | |
2bad8471 | 515 | { |
6a3124a3 | 516 | int err; |
7880b43b | 517 | const unsigned char *name; |
6636b6dc | 518 | struct p9_fid *dfid, *ofid = NULL, *fid = NULL; |
6a3124a3 | 519 | struct inode *inode; |
6a3124a3 | 520 | |
4b8e9923 | 521 | p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); |
51a87c55 | 522 | |
7880b43b | 523 | name = dentry->d_name.name; |
77d5a6b7 | 524 | dfid = v9fs_parent_fid(dentry); |
ba17674f | 525 | if (IS_ERR(dfid)) { |
da977b2c | 526 | err = PTR_ERR(dfid); |
5d385153 | 527 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
6d27e64d | 528 | return ERR_PTR(err); |
da977b2c | 529 | } |
6a3124a3 | 530 | |
bd238fb4 | 531 | /* clone a fid to use for creation */ |
7d50a29f | 532 | ofid = clone_fid(dfid); |
bd238fb4 LI |
533 | if (IS_ERR(ofid)) { |
534 | err = PTR_ERR(ofid); | |
5d385153 | 535 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
dafbe689 | 536 | goto error; |
bd238fb4 | 537 | } |
6a3124a3 | 538 | |
bd238fb4 | 539 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
51a87c55 | 540 | if (err < 0) { |
5d385153 | 541 | p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); |
6a3124a3 | 542 | goto error; |
6d27e64d | 543 | } |
6a3124a3 | 544 | |
b6054793 AK |
545 | if (!(perm & P9_DMLINK)) { |
546 | /* now walk from the parent so we can get unopened fid */ | |
547 | fid = p9_client_walk(dfid, 1, &name, 1); | |
548 | if (IS_ERR(fid)) { | |
549 | err = PTR_ERR(fid); | |
550 | p9_debug(P9_DEBUG_VFS, | |
551 | "p9_client_walk failed %d\n", err); | |
b6054793 AK |
552 | goto error; |
553 | } | |
554 | /* | |
555 | * instantiate inode and assign the unopened fid to the dentry | |
556 | */ | |
724a0845 | 557 | inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); |
b6054793 AK |
558 | if (IS_ERR(inode)) { |
559 | err = PTR_ERR(inode); | |
560 | p9_debug(P9_DEBUG_VFS, | |
561 | "inode creation failed %d\n", err); | |
562 | goto error; | |
563 | } | |
dafbe689 | 564 | v9fs_fid_add(dentry, &fid); |
b6054793 | 565 | d_instantiate(dentry, inode); |
6a3124a3 | 566 | } |
b48dbb99 | 567 | p9_fid_put(dfid); |
bd238fb4 | 568 | return ofid; |
bd238fb4 | 569 | error: |
dafbe689 DM |
570 | p9_fid_put(dfid); |
571 | p9_fid_put(ofid); | |
572 | p9_fid_put(fid); | |
bd238fb4 LI |
573 | return ERR_PTR(err); |
574 | } | |
575 | ||
576 | /** | |
e43ae79c | 577 | * v9fs_vfs_create - VFS hook to create a regular file |
6c960e68 | 578 | * @idmap: idmap of the mount |
bc868036 DH |
579 | * @dir: The parent directory |
580 | * @dentry: The name of file to be created | |
581 | * @mode: The UNIX file mode to set | |
582 | * @excl: True if the file must not yet exist | |
e43ae79c MS |
583 | * |
584 | * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called | |
585 | * for mknod(2). | |
586 | * | |
bd238fb4 | 587 | */ |
6a3124a3 | 588 | |
bd238fb4 | 589 | static int |
6c960e68 | 590 | v9fs_vfs_create(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 591 | struct dentry *dentry, umode_t mode, bool excl) |
bd238fb4 | 592 | { |
e43ae79c MS |
593 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
594 | u32 perm = unixmode2p9mode(v9ses, mode); | |
595 | struct p9_fid *fid; | |
bd238fb4 | 596 | |
e43ae79c MS |
597 | /* P9_OEXCL? */ |
598 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); | |
599 | if (IS_ERR(fid)) | |
600 | return PTR_ERR(fid); | |
bd238fb4 | 601 | |
d28c61f0 | 602 | v9fs_invalidate_inode_attr(dir); |
b48dbb99 | 603 | p9_fid_put(fid); |
6a3124a3 LI |
604 | |
605 | return 0; | |
2bad8471 EVH |
606 | } |
607 | ||
608 | /** | |
609 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory | |
c54bd91e | 610 | * @idmap: idmap of the mount |
ee443996 | 611 | * @dir: inode that is being unlinked |
2bad8471 EVH |
612 | * @dentry: dentry that is being unlinked |
613 | * @mode: mode for new directory | |
614 | * | |
615 | */ | |
616 | ||
c54bd91e | 617 | static int v9fs_vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 618 | struct dentry *dentry, umode_t mode) |
2bad8471 | 619 | { |
6a3124a3 | 620 | int err; |
bd238fb4 | 621 | u32 perm; |
bd238fb4 | 622 | struct p9_fid *fid; |
d28c61f0 | 623 | struct v9fs_session_info *v9ses; |
6a3124a3 | 624 | |
4b8e9923 | 625 | p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); |
bd238fb4 | 626 | err = 0; |
6a3124a3 | 627 | v9ses = v9fs_inode2v9ses(dir); |
6a3124a3 | 628 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
bd238fb4 LI |
629 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
630 | if (IS_ERR(fid)) { | |
631 | err = PTR_ERR(fid); | |
632 | fid = NULL; | |
d28c61f0 | 633 | } else { |
b271ec47 | 634 | inc_nlink(dir); |
d28c61f0 AK |
635 | v9fs_invalidate_inode_attr(dir); |
636 | } | |
6a3124a3 | 637 | |
bd238fb4 | 638 | if (fid) |
b48dbb99 | 639 | p9_fid_put(fid); |
6a3124a3 | 640 | |
6a3124a3 | 641 | return err; |
2bad8471 EVH |
642 | } |
643 | ||
644 | /** | |
645 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode | |
646 | * @dir: inode that is being walked from | |
647 | * @dentry: dentry that is being walked to? | |
fd2916bd | 648 | * @flags: lookup flags (unused) |
2bad8471 EVH |
649 | * |
650 | */ | |
651 | ||
53c06f4e | 652 | struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 653 | unsigned int flags) |
2bad8471 | 654 | { |
73f50717 | 655 | struct dentry *res; |
2bad8471 | 656 | struct v9fs_session_info *v9ses; |
bd238fb4 | 657 | struct p9_fid *dfid, *fid; |
2bad8471 | 658 | struct inode *inode; |
7880b43b | 659 | const unsigned char *name; |
2bad8471 | 660 | |
4b8e9923 AV |
661 | p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", |
662 | dir, dentry, dentry, flags); | |
2bad8471 | 663 | |
11e9b49b SK |
664 | if (dentry->d_name.len > NAME_MAX) |
665 | return ERR_PTR(-ENAMETOOLONG); | |
666 | ||
2bad8471 | 667 | v9ses = v9fs_inode2v9ses(dir); |
a534c8d1 | 668 | /* We can walk d_parent because we hold the dir->i_mutex */ |
77d5a6b7 | 669 | dfid = v9fs_parent_fid(dentry); |
bd238fb4 | 670 | if (IS_ERR(dfid)) |
e231c2ee | 671 | return ERR_CAST(dfid); |
bd238fb4 | 672 | |
73f50717 AK |
673 | /* |
674 | * Make sure we don't use a wrong inode due to parallel | |
675 | * unlink. For cached mode create calls request for new | |
676 | * inode. But with cache disabled, lookup should do this. | |
677 | */ | |
500e2ab6 AV |
678 | name = dentry->d_name.name; |
679 | fid = p9_client_walk(dfid, 1, &name, 1); | |
b48dbb99 | 680 | p9_fid_put(dfid); |
500e2ab6 AV |
681 | if (fid == ERR_PTR(-ENOENT)) |
682 | inode = NULL; | |
683 | else if (IS_ERR(fid)) | |
684 | inode = ERR_CAST(fid); | |
73f50717 | 685 | else |
724a0845 | 686 | inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); |
73f50717 AK |
687 | /* |
688 | * If we had a rename on the server and a parallel lookup | |
689 | * for the new name, then make sure we instantiate with | |
690 | * the new name. ie look up for a/b, while on server somebody | |
691 | * moved b under k and client parallely did a lookup for | |
692 | * k/b. | |
693 | */ | |
41d28bca | 694 | res = d_splice_alias(inode, dentry); |
500e2ab6 AV |
695 | if (!IS_ERR(fid)) { |
696 | if (!res) | |
dafbe689 | 697 | v9fs_fid_add(dentry, &fid); |
500e2ab6 | 698 | else if (!IS_ERR(res)) |
dafbe689 | 699 | v9fs_fid_add(res, &fid); |
500e2ab6 | 700 | else |
b48dbb99 | 701 | p9_fid_put(fid); |
500e2ab6 | 702 | } |
7b5be621 | 703 | return res; |
2bad8471 EVH |
704 | } |
705 | ||
d9585277 | 706 | static int |
e43ae79c | 707 | v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, |
6e195b0f | 708 | struct file *file, unsigned int flags, umode_t mode) |
e43ae79c MS |
709 | { |
710 | int err; | |
711 | u32 perm; | |
4eb31178 | 712 | struct v9fs_inode __maybe_unused *v9inode; |
e43ae79c | 713 | struct v9fs_session_info *v9ses; |
1543b4c5 | 714 | struct p9_fid *fid; |
e43ae79c | 715 | struct dentry *res = NULL; |
987a6485 | 716 | struct inode *inode; |
1543b4c5 | 717 | int p9_omode; |
e43ae79c | 718 | |
00699ad8 | 719 | if (d_in_lookup(dentry)) { |
00cd8dd3 | 720 | res = v9fs_vfs_lookup(dir, dentry, 0); |
e43ae79c | 721 | if (IS_ERR(res)) |
d9585277 | 722 | return PTR_ERR(res); |
e43ae79c MS |
723 | |
724 | if (res) | |
725 | dentry = res; | |
726 | } | |
727 | ||
728 | /* Only creates */ | |
2b0143b5 | 729 | if (!(flags & O_CREAT) || d_really_is_positive(dentry)) |
e45198a6 | 730 | return finish_no_open(file, res); |
e43ae79c | 731 | |
e43ae79c MS |
732 | v9ses = v9fs_inode2v9ses(dir); |
733 | perm = unixmode2p9mode(v9ses, mode); | |
1543b4c5 EVH |
734 | p9_omode = v9fs_uflags2omode(flags, v9fs_proto_dotu(v9ses)); |
735 | ||
4eb31178 | 736 | if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) { |
21e26d5e | 737 | p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR; |
1543b4c5 EVH |
738 | p9_debug(P9_DEBUG_CACHE, |
739 | "write-only file with writeback enabled, creating w/ O_RDWR\n"); | |
740 | } | |
741 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, p9_omode); | |
e43ae79c MS |
742 | if (IS_ERR(fid)) { |
743 | err = PTR_ERR(fid); | |
e43ae79c MS |
744 | goto error; |
745 | } | |
746 | ||
747 | v9fs_invalidate_inode_attr(dir); | |
987a6485 GK |
748 | inode = d_inode(dentry); |
749 | v9inode = V9FS_I(inode); | |
be12af3e | 750 | err = finish_open(file, dentry, generic_file_open); |
30d90494 | 751 | if (err) |
e43ae79c | 752 | goto error; |
e43ae79c | 753 | |
30d90494 | 754 | file->private_data = fid; |
4eb31178 EVH |
755 | #ifdef CONFIG_9P_FSCACHE |
756 | if (v9ses->cache & CACHE_FSCACHE) | |
24e42e32 DH |
757 | fscache_use_cookie(v9fs_inode_cookie(v9inode), |
758 | file->f_mode & FMODE_WRITE); | |
4eb31178 | 759 | #endif |
1543b4c5 EVH |
760 | |
761 | v9fs_fid_add_modes(fid, v9ses->flags, v9ses->cache, file->f_flags); | |
dafbe689 | 762 | v9fs_open_fid_add(inode, &fid); |
e43ae79c | 763 | |
73a09dd9 | 764 | file->f_mode |= FMODE_CREATED; |
e43ae79c MS |
765 | out: |
766 | dput(res); | |
d9585277 | 767 | return err; |
e43ae79c MS |
768 | |
769 | error: | |
dafbe689 | 770 | p9_fid_put(fid); |
e43ae79c MS |
771 | goto out; |
772 | } | |
773 | ||
2bad8471 EVH |
774 | /** |
775 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode | |
776 | * @i: inode that is being unlinked | |
73c592b9 | 777 | * @d: dentry that is being unlinked |
2bad8471 EVH |
778 | * |
779 | */ | |
780 | ||
53c06f4e | 781 | int v9fs_vfs_unlink(struct inode *i, struct dentry *d) |
2bad8471 EVH |
782 | { |
783 | return v9fs_remove(i, d, 0); | |
784 | } | |
785 | ||
786 | /** | |
787 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory | |
788 | * @i: inode that is being unlinked | |
73c592b9 | 789 | * @d: dentry that is being unlinked |
2bad8471 EVH |
790 | * |
791 | */ | |
792 | ||
53c06f4e | 793 | int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) |
2bad8471 | 794 | { |
48e370ff | 795 | return v9fs_remove(i, d, AT_REMOVEDIR); |
2bad8471 EVH |
796 | } |
797 | ||
798 | /** | |
799 | * v9fs_vfs_rename - VFS hook to rename an inode | |
e18275ae | 800 | * @idmap: The idmap of the mount |
2bad8471 EVH |
801 | * @old_dir: old dir inode |
802 | * @old_dentry: old dentry | |
803 | * @new_dir: new dir inode | |
804 | * @new_dentry: new dentry | |
bc868036 | 805 | * @flags: RENAME_* flags |
2bad8471 EVH |
806 | * |
807 | */ | |
808 | ||
53c06f4e | 809 | int |
e18275ae | 810 | v9fs_vfs_rename(struct mnt_idmap *idmap, struct inode *old_dir, |
549c7297 CB |
811 | struct dentry *old_dentry, struct inode *new_dir, |
812 | struct dentry *new_dentry, unsigned int flags) | |
2bad8471 | 813 | { |
d28c61f0 | 814 | int retval; |
bd238fb4 | 815 | struct inode *old_inode; |
b271ec47 | 816 | struct inode *new_inode; |
bd238fb4 | 817 | struct v9fs_session_info *v9ses; |
dafbe689 DM |
818 | struct p9_fid *oldfid = NULL, *dfid = NULL; |
819 | struct p9_fid *olddirfid = NULL; | |
820 | struct p9_fid *newdirfid = NULL; | |
bd238fb4 | 821 | struct p9_wstat wstat; |
2bad8471 | 822 | |
1cd66c93 MS |
823 | if (flags) |
824 | return -EINVAL; | |
825 | ||
5d385153 | 826 | p9_debug(P9_DEBUG_VFS, "\n"); |
2b0143b5 DH |
827 | old_inode = d_inode(old_dentry); |
828 | new_inode = d_inode(new_dentry); | |
bd238fb4 LI |
829 | v9ses = v9fs_inode2v9ses(old_inode); |
830 | oldfid = v9fs_fid_lookup(old_dentry); | |
ba17674f | 831 | if (IS_ERR(oldfid)) |
da977b2c EVH |
832 | return PTR_ERR(oldfid); |
833 | ||
6636b6dc JW |
834 | dfid = v9fs_parent_fid(old_dentry); |
835 | olddirfid = clone_fid(dfid); | |
dafbe689 DM |
836 | p9_fid_put(dfid); |
837 | dfid = NULL; | |
6636b6dc | 838 | |
ba17674f | 839 | if (IS_ERR(olddirfid)) { |
da977b2c | 840 | retval = PTR_ERR(olddirfid); |
dafbe689 | 841 | goto error; |
da977b2c EVH |
842 | } |
843 | ||
6636b6dc JW |
844 | dfid = v9fs_parent_fid(new_dentry); |
845 | newdirfid = clone_fid(dfid); | |
b48dbb99 | 846 | p9_fid_put(dfid); |
dafbe689 | 847 | dfid = NULL; |
6636b6dc | 848 | |
ba17674f | 849 | if (IS_ERR(newdirfid)) { |
da977b2c | 850 | retval = PTR_ERR(newdirfid); |
dafbe689 | 851 | goto error; |
2bad8471 EVH |
852 | } |
853 | ||
a534c8d1 | 854 | down_write(&v9ses->rename_sem); |
4681dbda | 855 | if (v9fs_proto_dotl(v9ses)) { |
9e8fb38e AK |
856 | retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, |
857 | newdirfid, new_dentry->d_name.name); | |
858 | if (retval == -EOPNOTSUPP) | |
859 | retval = p9_client_rename(oldfid, newdirfid, | |
860 | new_dentry->d_name.name); | |
861 | if (retval != -EOPNOTSUPP) | |
dafbe689 | 862 | goto error_locked; |
4681dbda | 863 | } |
a534c8d1 AK |
864 | if (old_dentry->d_parent != new_dentry->d_parent) { |
865 | /* | |
866 | * 9P .u can only handle file rename in the same directory | |
867 | */ | |
4681dbda | 868 | |
5d385153 | 869 | p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); |
621997cd | 870 | retval = -EXDEV; |
dafbe689 | 871 | goto error_locked; |
2bad8471 | 872 | } |
531b1094 | 873 | v9fs_blank_wstat(&wstat); |
ba17674f | 874 | wstat.muid = v9ses->uname; |
7880b43b | 875 | wstat.name = new_dentry->d_name.name; |
bd238fb4 | 876 | retval = p9_client_wstat(oldfid, &wstat); |
2bad8471 | 877 | |
dafbe689 | 878 | error_locked: |
b271ec47 AK |
879 | if (!retval) { |
880 | if (new_inode) { | |
881 | if (S_ISDIR(new_inode->i_mode)) | |
882 | clear_nlink(new_inode); | |
883 | else | |
ac89b2ef | 884 | v9fs_dec_count(new_inode); |
b271ec47 AK |
885 | } |
886 | if (S_ISDIR(old_inode->i_mode)) { | |
887 | if (!new_inode) | |
888 | inc_nlink(new_dir); | |
ac89b2ef | 889 | v9fs_dec_count(old_dir); |
b271ec47 | 890 | } |
3bc86de3 | 891 | v9fs_invalidate_inode_attr(old_inode); |
d28c61f0 AK |
892 | v9fs_invalidate_inode_attr(old_dir); |
893 | v9fs_invalidate_inode_attr(new_dir); | |
3bc86de3 | 894 | |
a534c8d1 AK |
895 | /* successful rename */ |
896 | d_move(old_dentry, new_dentry); | |
b271ec47 | 897 | } |
a534c8d1 | 898 | up_write(&v9ses->rename_sem); |
2bad8471 | 899 | |
dafbe689 DM |
900 | error: |
901 | p9_fid_put(newdirfid); | |
b48dbb99 | 902 | p9_fid_put(olddirfid); |
b48dbb99 | 903 | p9_fid_put(oldfid); |
2bad8471 EVH |
904 | return retval; |
905 | } | |
906 | ||
907 | /** | |
943ffb58 | 908 | * v9fs_vfs_getattr - retrieve file metadata |
b74d24f7 | 909 | * @idmap: idmap of the mount |
a528d35e | 910 | * @path: Object to query |
ee443996 | 911 | * @stat: metadata structure to populate |
a528d35e DH |
912 | * @request_mask: Mask of STATX_xxx flags indicating the caller's interests |
913 | * @flags: AT_STATX_xxx setting | |
2bad8471 EVH |
914 | * |
915 | */ | |
916 | ||
917 | static int | |
b74d24f7 | 918 | v9fs_vfs_getattr(struct mnt_idmap *idmap, const struct path *path, |
549c7297 | 919 | struct kstat *stat, u32 request_mask, unsigned int flags) |
2bad8471 | 920 | { |
a528d35e | 921 | struct dentry *dentry = path->dentry; |
d9bc0d11 | 922 | struct inode *inode = d_inode(dentry); |
bd238fb4 LI |
923 | struct v9fs_session_info *v9ses; |
924 | struct p9_fid *fid; | |
51a87c55 | 925 | struct p9_wstat *st; |
bd238fb4 | 926 | |
5d385153 | 927 | p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); |
42869c8a | 928 | v9ses = v9fs_dentry2v9ses(dentry); |
4eb31178 | 929 | if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { |
0d72b928 | 930 | generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); |
a1211908 | 931 | return 0; |
4eb31178 | 932 | } else if (v9ses->cache & CACHE_WRITEBACK) { |
d9bc0d11 EVH |
933 | if (S_ISREG(inode->i_mode)) { |
934 | int retval = filemap_fdatawrite(inode->i_mapping); | |
935 | ||
936 | if (retval) | |
937 | p9_debug(P9_DEBUG_ERROR, | |
938 | "flushing writeback during getattr returned %d\n", retval); | |
939 | } | |
a1211908 | 940 | } |
bd238fb4 LI |
941 | fid = v9fs_fid_lookup(dentry); |
942 | if (IS_ERR(fid)) | |
da977b2c | 943 | return PTR_ERR(fid); |
2bad8471 | 944 | |
bd238fb4 | 945 | st = p9_client_stat(fid); |
b48dbb99 | 946 | p9_fid_put(fid); |
bd238fb4 LI |
947 | if (IS_ERR(st)) |
948 | return PTR_ERR(st); | |
2bad8471 | 949 | |
5e3cc1ee | 950 | v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); |
0d72b928 | 951 | generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat); |
2bad8471 | 952 | |
62b2be59 | 953 | p9stat_free(st); |
bd238fb4 LI |
954 | kfree(st); |
955 | return 0; | |
2bad8471 EVH |
956 | } |
957 | ||
958 | /** | |
959 | * v9fs_vfs_setattr - set file metadata | |
c1632a0f | 960 | * @idmap: idmap of the mount |
2bad8471 EVH |
961 | * @dentry: file whose metadata to set |
962 | * @iattr: metadata assignment structure | |
963 | * | |
964 | */ | |
965 | ||
c1632a0f | 966 | static int v9fs_vfs_setattr(struct mnt_idmap *idmap, |
549c7297 | 967 | struct dentry *dentry, struct iattr *iattr) |
2bad8471 | 968 | { |
6636b6dc | 969 | int retval, use_dentry = 0; |
24e42e32 | 970 | struct inode *inode = d_inode(dentry); |
bd238fb4 | 971 | struct v9fs_session_info *v9ses; |
66246641 | 972 | struct p9_fid *fid = NULL; |
bd238fb4 | 973 | struct p9_wstat wstat; |
2bad8471 | 974 | |
5d385153 | 975 | p9_debug(P9_DEBUG_VFS, "\n"); |
c1632a0f | 976 | retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr); |
059c138b AK |
977 | if (retval) |
978 | return retval; | |
979 | ||
42869c8a | 980 | v9ses = v9fs_dentry2v9ses(dentry); |
66246641 JW |
981 | if (iattr->ia_valid & ATTR_FILE) { |
982 | fid = iattr->ia_file->private_data; | |
983 | WARN_ON(!fid); | |
984 | } | |
6636b6dc | 985 | if (!fid) { |
66246641 | 986 | fid = v9fs_fid_lookup(dentry); |
6636b6dc JW |
987 | use_dentry = 1; |
988 | } | |
6e195b0f | 989 | if (IS_ERR(fid)) |
da977b2c | 990 | return PTR_ERR(fid); |
2bad8471 | 991 | |
531b1094 | 992 | v9fs_blank_wstat(&wstat); |
2bad8471 | 993 | if (iattr->ia_valid & ATTR_MODE) |
531b1094 | 994 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
2bad8471 EVH |
995 | |
996 | if (iattr->ia_valid & ATTR_MTIME) | |
531b1094 | 997 | wstat.mtime = iattr->ia_mtime.tv_sec; |
2bad8471 EVH |
998 | |
999 | if (iattr->ia_valid & ATTR_ATIME) | |
531b1094 | 1000 | wstat.atime = iattr->ia_atime.tv_sec; |
2bad8471 EVH |
1001 | |
1002 | if (iattr->ia_valid & ATTR_SIZE) | |
531b1094 | 1003 | wstat.length = iattr->ia_size; |
2bad8471 | 1004 | |
dd6102fb | 1005 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
1006 | if (iattr->ia_valid & ATTR_UID) |
1007 | wstat.n_uid = iattr->ia_uid; | |
2bad8471 | 1008 | |
531b1094 LI |
1009 | if (iattr->ia_valid & ATTR_GID) |
1010 | wstat.n_gid = iattr->ia_gid; | |
2bad8471 | 1011 | } |
059c138b | 1012 | |
3dc5436a | 1013 | /* Write all dirty data */ |
d9bc0d11 EVH |
1014 | if (d_is_reg(dentry)) { |
1015 | retval = filemap_fdatawrite(inode->i_mapping); | |
1016 | if (retval) | |
1017 | p9_debug(P9_DEBUG_ERROR, | |
1018 | "flushing writeback during setattr returned %d\n", retval); | |
1019 | } | |
3dc5436a | 1020 | |
f10fc50f | 1021 | retval = p9_client_wstat(fid, &wstat); |
6636b6dc JW |
1022 | |
1023 | if (use_dentry) | |
b48dbb99 | 1024 | p9_fid_put(fid); |
6636b6dc | 1025 | |
f10fc50f AK |
1026 | if (retval < 0) |
1027 | return retval; | |
059c138b AK |
1028 | |
1029 | if ((iattr->ia_valid & ATTR_SIZE) && | |
d9bc0d11 | 1030 | iattr->ia_size != i_size_read(inode)) { |
24e42e32 | 1031 | truncate_setsize(inode, iattr->ia_size); |
80105ed2 | 1032 | netfs_resize_file(netfs_inode(inode), iattr->ia_size, true); |
1543b4c5 | 1033 | |
4eb31178 EVH |
1034 | #ifdef CONFIG_9P_FSCACHE |
1035 | if (v9ses->cache & CACHE_FSCACHE) { | |
1036 | struct v9fs_inode *v9inode = V9FS_I(inode); | |
1037 | ||
d9bc0d11 | 1038 | fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size); |
4eb31178 EVH |
1039 | } |
1040 | #endif | |
24e42e32 | 1041 | } |
059c138b | 1042 | |
24e42e32 | 1043 | v9fs_invalidate_inode_attr(inode); |
2bad8471 | 1044 | |
c1632a0f | 1045 | setattr_copy(&nop_mnt_idmap, inode, iattr); |
24e42e32 | 1046 | mark_inode_dirty(inode); |
1025774c | 1047 | return 0; |
2bad8471 EVH |
1048 | } |
1049 | ||
1050 | /** | |
531b1094 LI |
1051 | * v9fs_stat2inode - populate an inode structure with mistat info |
1052 | * @stat: Plan 9 metadata (mistat) structure | |
2bad8471 EVH |
1053 | * @inode: inode to populate |
1054 | * @sb: superblock of filesystem | |
5e3cc1ee | 1055 | * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) |
2bad8471 EVH |
1056 | * |
1057 | */ | |
1058 | ||
1059 | void | |
51a87c55 | 1060 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
5e3cc1ee | 1061 | struct super_block *sb, unsigned int flags) |
2bad8471 | 1062 | { |
3eda0de6 | 1063 | umode_t mode; |
2bad8471 | 1064 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
b3cbea03 | 1065 | struct v9fs_inode *v9inode = V9FS_I(inode); |
2bad8471 | 1066 | |
d0242a3a JL |
1067 | inode_set_atime(inode, stat->atime, 0); |
1068 | inode_set_mtime(inode, stat->mtime, 0); | |
4f871800 | 1069 | inode_set_ctime(inode, stat->mtime, 0); |
2bad8471 | 1070 | |
bd32b82d LI |
1071 | inode->i_uid = v9ses->dfltuid; |
1072 | inode->i_gid = v9ses->dfltgid; | |
2bad8471 | 1073 | |
dd6102fb | 1074 | if (v9fs_proto_dotu(v9ses)) { |
531b1094 LI |
1075 | inode->i_uid = stat->n_uid; |
1076 | inode->i_gid = stat->n_gid; | |
2bad8471 | 1077 | } |
5717144a | 1078 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
9652c732 AV |
1079 | if (v9fs_proto_dotu(v9ses)) { |
1080 | unsigned int i_nlink; | |
5717144a | 1081 | /* |
9652c732 AV |
1082 | * Hadlink support got added later to the .u extension. |
1083 | * So there can be a server out there that doesn't | |
1084 | * support this even with .u extension. That would | |
1085 | * just leave us with stat->extension being an empty | |
1086 | * string, though. | |
5717144a | 1087 | */ |
5717144a | 1088 | /* HARDLINKCOUNT %u */ |
9652c732 AV |
1089 | if (sscanf(stat->extension, |
1090 | " HARDLINKCOUNT %u", &i_nlink) == 1) | |
bfe86848 | 1091 | set_nlink(inode, i_nlink); |
5717144a AK |
1092 | } |
1093 | } | |
df345c67 | 1094 | mode = p9mode2perm(v9ses, stat); |
45089142 AK |
1095 | mode |= inode->i_mode & ~S_IALLUGO; |
1096 | inode->i_mode = mode; | |
2bad8471 | 1097 | |
80105ed2 | 1098 | v9inode->netfs.remote_i_size = stat->length; |
5e3cc1ee HT |
1099 | if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) |
1100 | v9fs_i_size_write(inode, stat->length); | |
bd238fb4 | 1101 | /* not real number of blocks, but 512 byte ones ... */ |
5e3cc1ee | 1102 | inode->i_blocks = (stat->length + 512 - 1) >> 9; |
b3cbea03 | 1103 | v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; |
2bad8471 EVH |
1104 | } |
1105 | ||
2bad8471 | 1106 | /** |
6b255391 | 1107 | * v9fs_vfs_get_link - follow a symlink path |
2bad8471 | 1108 | * @dentry: dentry for symlink |
6b255391 | 1109 | * @inode: inode for symlink |
fceef393 | 1110 | * @done: delayed call for when we are done with the return value |
2bad8471 EVH |
1111 | */ |
1112 | ||
6b255391 | 1113 | static const char *v9fs_vfs_get_link(struct dentry *dentry, |
fceef393 AV |
1114 | struct inode *inode, |
1115 | struct delayed_call *done) | |
2bad8471 | 1116 | { |
6b255391 AV |
1117 | struct v9fs_session_info *v9ses; |
1118 | struct p9_fid *fid; | |
51a87c55 | 1119 | struct p9_wstat *st; |
680baacb | 1120 | char *res; |
2bad8471 | 1121 | |
6b255391 AV |
1122 | if (!dentry) |
1123 | return ERR_PTR(-ECHILD); | |
1124 | ||
1125 | v9ses = v9fs_dentry2v9ses(dentry); | |
e5690f26 DM |
1126 | if (!v9fs_proto_dotu(v9ses)) |
1127 | return ERR_PTR(-EBADF); | |
1128 | ||
90e4fc88 | 1129 | p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); |
e5690f26 | 1130 | fid = v9fs_fid_lookup(dentry); |
90e4fc88 | 1131 | |
ba17674f | 1132 | if (IS_ERR(fid)) |
90e4fc88 | 1133 | return ERR_CAST(fid); |
2bad8471 | 1134 | |
bd238fb4 | 1135 | st = p9_client_stat(fid); |
b48dbb99 | 1136 | p9_fid_put(fid); |
bd238fb4 | 1137 | if (IS_ERR(st)) |
90e4fc88 | 1138 | return ERR_CAST(st); |
2bad8471 | 1139 | |
bd238fb4 | 1140 | if (!(st->mode & P9_DMSYMLINK)) { |
90e4fc88 AV |
1141 | p9stat_free(st); |
1142 | kfree(st); | |
1143 | return ERR_PTR(-EINVAL); | |
2bad8471 | 1144 | } |
680baacb | 1145 | res = st->extension; |
90e4fc88 | 1146 | st->extension = NULL; |
680baacb AV |
1147 | if (strlen(res) >= PATH_MAX) |
1148 | res[PATH_MAX - 1] = '\0'; | |
1149 | ||
62b2be59 | 1150 | p9stat_free(st); |
bd238fb4 | 1151 | kfree(st); |
fceef393 AV |
1152 | set_delayed_call(done, kfree_link, res); |
1153 | return res; | |
2bad8471 EVH |
1154 | } |
1155 | ||
ee443996 EVH |
1156 | /** |
1157 | * v9fs_vfs_mkspecial - create a special file | |
1158 | * @dir: inode to create special file in | |
1159 | * @dentry: dentry to create | |
fd2916bd | 1160 | * @perm: mode to create special file |
ee443996 EVH |
1161 | * @extension: 9p2000.u format extension string representing special file |
1162 | * | |
1163 | */ | |
1164 | ||
531b1094 | 1165 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
c2837de7 | 1166 | u32 perm, const char *extension) |
2bad8471 | 1167 | { |
bd238fb4 | 1168 | struct p9_fid *fid; |
d28c61f0 | 1169 | struct v9fs_session_info *v9ses; |
2bad8471 | 1170 | |
6a3124a3 | 1171 | v9ses = v9fs_inode2v9ses(dir); |
dd6102fb | 1172 | if (!v9fs_proto_dotu(v9ses)) { |
5d385153 | 1173 | p9_debug(P9_DEBUG_ERROR, "not extended\n"); |
6a3124a3 | 1174 | return -EPERM; |
2bad8471 EVH |
1175 | } |
1176 | ||
bd238fb4 LI |
1177 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
1178 | P9_OREAD); | |
1179 | if (IS_ERR(fid)) | |
1180 | return PTR_ERR(fid); | |
da977b2c | 1181 | |
d28c61f0 | 1182 | v9fs_invalidate_inode_attr(dir); |
b48dbb99 | 1183 | p9_fid_put(fid); |
6a3124a3 | 1184 | return 0; |
531b1094 LI |
1185 | } |
1186 | ||
1187 | /** | |
1188 | * v9fs_vfs_symlink - helper function to create symlinks | |
7a77db95 | 1189 | * @idmap: idmap of the mount |
531b1094 LI |
1190 | * @dir: directory inode containing symlink |
1191 | * @dentry: dentry for symlink | |
1192 | * @symname: symlink data | |
1193 | * | |
ee443996 | 1194 | * See Also: 9P2000.u RFC for more information |
531b1094 LI |
1195 | * |
1196 | */ | |
1197 | ||
1198 | static int | |
7a77db95 | 1199 | v9fs_vfs_symlink(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 1200 | struct dentry *dentry, const char *symname) |
531b1094 | 1201 | { |
4b8e9923 AV |
1202 | p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", |
1203 | dir->i_ino, dentry, symname); | |
531b1094 | 1204 | |
c2837de7 | 1205 | return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); |
531b1094 LI |
1206 | } |
1207 | ||
b46c267e AV |
1208 | #define U32_MAX_DIGITS 10 |
1209 | ||
531b1094 LI |
1210 | /** |
1211 | * v9fs_vfs_link - create a hardlink | |
1212 | * @old_dentry: dentry for file to link to | |
1213 | * @dir: inode destination for new link | |
1214 | * @dentry: dentry for link | |
1215 | * | |
1216 | */ | |
1217 | ||
531b1094 LI |
1218 | static int |
1219 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, | |
1220 | struct dentry *dentry) | |
1221 | { | |
1222 | int retval; | |
b46c267e | 1223 | char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ |
d28c61f0 | 1224 | struct p9_fid *oldfid; |
531b1094 | 1225 | |
4b8e9923 AV |
1226 | p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", |
1227 | dir->i_ino, dentry, old_dentry); | |
531b1094 | 1228 | |
da977b2c | 1229 | oldfid = v9fs_fid_clone(old_dentry); |
ba17674f | 1230 | if (IS_ERR(oldfid)) |
da977b2c | 1231 | return PTR_ERR(oldfid); |
531b1094 | 1232 | |
16cce6d2 | 1233 | sprintf(name, "%d\n", oldfid->fid); |
bd238fb4 | 1234 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
c06c066a | 1235 | if (!retval) { |
2b0143b5 | 1236 | v9fs_refresh_inode(oldfid, d_inode(old_dentry)); |
d28c61f0 | 1237 | v9fs_invalidate_inode_attr(dir); |
c06c066a | 1238 | } |
b48dbb99 | 1239 | p9_fid_put(oldfid); |
2bad8471 EVH |
1240 | return retval; |
1241 | } | |
1242 | ||
1243 | /** | |
1244 | * v9fs_vfs_mknod - create a special file | |
5ebb29be | 1245 | * @idmap: idmap of the mount |
2bad8471 EVH |
1246 | * @dir: inode destination for new link |
1247 | * @dentry: dentry for file | |
1248 | * @mode: mode for creation | |
ee443996 | 1249 | * @rdev: device associated with special file |
2bad8471 EVH |
1250 | * |
1251 | */ | |
1252 | ||
1253 | static int | |
5ebb29be | 1254 | v9fs_vfs_mknod(struct mnt_idmap *idmap, struct inode *dir, |
549c7297 | 1255 | struct dentry *dentry, umode_t mode, dev_t rdev) |
2bad8471 | 1256 | { |
c2837de7 | 1257 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
531b1094 | 1258 | int retval; |
b46c267e | 1259 | char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; |
c2837de7 | 1260 | u32 perm; |
2bad8471 | 1261 | |
6e195b0f | 1262 | p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", |
4b8e9923 | 1263 | dir->i_ino, dentry, mode, |
5d385153 | 1264 | MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1265 | |
2bad8471 EVH |
1266 | /* build extension */ |
1267 | if (S_ISBLK(mode)) | |
531b1094 | 1268 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
2bad8471 | 1269 | else if (S_ISCHR(mode)) |
531b1094 | 1270 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
b46c267e | 1271 | else |
75cc5c9b | 1272 | *name = 0; |
2bad8471 | 1273 | |
c2837de7 AV |
1274 | perm = unixmode2p9mode(v9ses, mode); |
1275 | retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); | |
2bad8471 EVH |
1276 | |
1277 | return retval; | |
1278 | } | |
1279 | ||
b3cbea03 AK |
1280 | int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) |
1281 | { | |
45089142 AK |
1282 | int umode; |
1283 | dev_t rdev; | |
b3cbea03 AK |
1284 | struct p9_wstat *st; |
1285 | struct v9fs_session_info *v9ses; | |
5e3cc1ee | 1286 | unsigned int flags; |
b3cbea03 AK |
1287 | |
1288 | v9ses = v9fs_inode2v9ses(inode); | |
1289 | st = p9_client_stat(fid); | |
1290 | if (IS_ERR(st)) | |
1291 | return PTR_ERR(st); | |
45089142 AK |
1292 | /* |
1293 | * Don't update inode if the file type is different | |
1294 | */ | |
1295 | umode = p9mode2unixmode(v9ses, st, &rdev); | |
6e3e2c43 | 1296 | if (inode_wrong_type(inode, umode)) |
45089142 | 1297 | goto out; |
b3cbea03 | 1298 | |
b3cbea03 AK |
1299 | /* |
1300 | * We don't want to refresh inode->i_size, | |
1301 | * because we may have cached data | |
1302 | */ | |
4eb31178 | 1303 | flags = (v9ses->cache & CACHE_LOOSE) ? |
5e3cc1ee HT |
1304 | V9FS_STAT2INODE_KEEP_ISIZE : 0; |
1305 | v9fs_stat2inode(st, inode, inode->i_sb, flags); | |
45089142 | 1306 | out: |
b3cbea03 AK |
1307 | p9stat_free(st); |
1308 | kfree(st); | |
1309 | return 0; | |
1310 | } | |
1311 | ||
9b6533c9 SK |
1312 | static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
1313 | .create = v9fs_vfs_create, | |
1314 | .lookup = v9fs_vfs_lookup, | |
e43ae79c | 1315 | .atomic_open = v9fs_vfs_atomic_open, |
9b6533c9 | 1316 | .symlink = v9fs_vfs_symlink, |
50cc42ff | 1317 | .link = v9fs_vfs_link, |
9b6533c9 SK |
1318 | .unlink = v9fs_vfs_unlink, |
1319 | .mkdir = v9fs_vfs_mkdir, | |
1320 | .rmdir = v9fs_vfs_rmdir, | |
1d76e313 | 1321 | .mknod = v9fs_vfs_mknod, |
9b6533c9 SK |
1322 | .rename = v9fs_vfs_rename, |
1323 | .getattr = v9fs_vfs_getattr, | |
1324 | .setattr = v9fs_vfs_setattr, | |
1325 | }; | |
1326 | ||
754661f1 | 1327 | static const struct inode_operations v9fs_dir_inode_operations = { |
b501611a EVH |
1328 | .create = v9fs_vfs_create, |
1329 | .lookup = v9fs_vfs_lookup, | |
e43ae79c | 1330 | .atomic_open = v9fs_vfs_atomic_open, |
b501611a EVH |
1331 | .unlink = v9fs_vfs_unlink, |
1332 | .mkdir = v9fs_vfs_mkdir, | |
1333 | .rmdir = v9fs_vfs_rmdir, | |
1334 | .mknod = v9fs_vfs_mknod, | |
1335 | .rename = v9fs_vfs_rename, | |
1336 | .getattr = v9fs_vfs_getattr, | |
1337 | .setattr = v9fs_vfs_setattr, | |
1338 | }; | |
1339 | ||
754661f1 | 1340 | static const struct inode_operations v9fs_file_inode_operations = { |
2bad8471 EVH |
1341 | .getattr = v9fs_vfs_getattr, |
1342 | .setattr = v9fs_vfs_setattr, | |
1343 | }; | |
1344 | ||
754661f1 | 1345 | static const struct inode_operations v9fs_symlink_inode_operations = { |
6b255391 | 1346 | .get_link = v9fs_vfs_get_link, |
2bad8471 EVH |
1347 | .getattr = v9fs_vfs_getattr, |
1348 | .setattr = v9fs_vfs_setattr, | |
1349 | }; | |
9b6533c9 | 1350 |