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