1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * This file contains vfs inode ops for the 9P2000.L protocol. |
4 | * |
5 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
6 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
7 | */ |
8 | |
9 | #include <linux/module.h> |
10 | #include <linux/errno.h> |
11 | #include <linux/fs.h> |
12 | #include <linux/file.h> |
13 | #include <linux/pagemap.h> |
14 | #include <linux/stat.h> |
15 | #include <linux/string.h> |
16 | #include <linux/namei.h> |
17 | #include <linux/sched.h> |
18 | #include <linux/slab.h> |
19 | #include <linux/xattr.h> |
20 | #include <linux/posix_acl.h> |
21 | #include <net/9p/9p.h> |
22 | #include <net/9p/client.h> |
23 | |
24 | #include "v9fs.h" |
25 | #include "v9fs_vfs.h" |
26 | #include "fid.h" |
27 | #include "cache.h" |
28 | #include "xattr.h" |
29 | #include "acl.h" |
30 | |
31 | static int |
32 | v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir, |
33 | struct dentry *dentry, umode_t omode, dev_t rdev); |
34 | |
35 | /** |
36 | * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object |
37 | * @dir_inode: The directory inode |
38 | * |
39 | * Helper function to get the gid for creating a |
40 | * new file system object. This checks the S_ISGID to determine the owning |
41 | * group of the new file system object. |
42 | */ |
43 | |
44 | static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) |
45 | { |
46 | BUG_ON(dir_inode == NULL); |
47 | |
48 | if (dir_inode->i_mode & S_ISGID) { |
49 | /* set_gid bit is set.*/ |
50 | return dir_inode->i_gid; |
51 | } |
52 | return current_fsgid(); |
53 | } |
54 | |
55 | struct inode *v9fs_fid_iget_dotl(struct super_block *sb, struct p9_fid *fid) |
56 | { |
57 | int retval; |
58 | struct inode *inode; |
59 | struct p9_stat_dotl *st; |
60 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
61 | |
62 | inode = iget_locked(sb, QID2INO(&fid->qid)); |
63 | if (unlikely(!inode)) |
64 | return ERR_PTR(error: -ENOMEM); |
65 | if (!(inode->i_state & I_NEW)) |
66 | return inode; |
67 | |
68 | /* |
69 | * initialize the inode with the stat info |
70 | * FIXME!! we may need support for stale inodes |
71 | * later. |
72 | */ |
73 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); |
74 | if (IS_ERR(ptr: st)) { |
75 | retval = PTR_ERR(ptr: st); |
76 | goto error; |
77 | } |
78 | |
79 | retval = v9fs_init_inode(v9ses, inode, qid: &fid->qid, |
80 | mode: st->st_mode, rdev: new_decode_dev(dev: st->st_rdev)); |
81 | v9fs_stat2inode_dotl(stat: st, inode, flags: 0); |
82 | kfree(objp: st); |
83 | if (retval) |
84 | goto error; |
85 | |
86 | v9fs_set_netfs_context(inode); |
87 | v9fs_cache_inode_get_cookie(inode); |
88 | retval = v9fs_get_acl(inode, fid); |
89 | if (retval) |
90 | goto error; |
91 | |
92 | unlock_new_inode(inode); |
93 | |
94 | return inode; |
95 | error: |
96 | iget_failed(inode); |
97 | return ERR_PTR(error: retval); |
98 | |
99 | } |
100 | |
101 | struct dotl_openflag_map { |
102 | int open_flag; |
103 | int dotl_flag; |
104 | }; |
105 | |
106 | static int v9fs_mapped_dotl_flags(int flags) |
107 | { |
108 | int i; |
109 | int rflags = 0; |
110 | struct dotl_openflag_map dotl_oflag_map[] = { |
111 | { O_CREAT, P9_DOTL_CREATE }, |
112 | { O_EXCL, P9_DOTL_EXCL }, |
113 | { O_NOCTTY, P9_DOTL_NOCTTY }, |
114 | { O_APPEND, P9_DOTL_APPEND }, |
115 | { O_NONBLOCK, P9_DOTL_NONBLOCK }, |
116 | { O_DSYNC, P9_DOTL_DSYNC }, |
117 | { FASYNC, P9_DOTL_FASYNC }, |
118 | { O_DIRECT, P9_DOTL_DIRECT }, |
119 | { O_LARGEFILE, P9_DOTL_LARGEFILE }, |
120 | { O_DIRECTORY, P9_DOTL_DIRECTORY }, |
121 | { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, |
122 | { O_NOATIME, P9_DOTL_NOATIME }, |
123 | { O_CLOEXEC, P9_DOTL_CLOEXEC }, |
124 | { O_SYNC, P9_DOTL_SYNC}, |
125 | }; |
126 | for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { |
127 | if (flags & dotl_oflag_map[i].open_flag) |
128 | rflags |= dotl_oflag_map[i].dotl_flag; |
129 | } |
130 | return rflags; |
131 | } |
132 | |
133 | /** |
134 | * v9fs_open_to_dotl_flags- convert Linux specific open flags to |
135 | * plan 9 open flag. |
136 | * @flags: flags to convert |
137 | */ |
138 | int v9fs_open_to_dotl_flags(int flags) |
139 | { |
140 | int rflags = 0; |
141 | |
142 | /* |
143 | * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY |
144 | * and P9_DOTL_NOACCESS |
145 | */ |
146 | rflags |= flags & O_ACCMODE; |
147 | rflags |= v9fs_mapped_dotl_flags(flags); |
148 | |
149 | return rflags; |
150 | } |
151 | |
152 | /** |
153 | * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. |
154 | * @idmap: The user namespace of the mount |
155 | * @dir: directory inode that is being created |
156 | * @dentry: dentry that is being deleted |
157 | * @omode: create permissions |
158 | * @excl: True if the file must not yet exist |
159 | * |
160 | */ |
161 | static int |
162 | v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir, |
163 | struct dentry *dentry, umode_t omode, bool excl) |
164 | { |
165 | return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, rdev: 0); |
166 | } |
167 | |
168 | static int |
169 | v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, |
170 | struct file *file, unsigned int flags, umode_t omode) |
171 | { |
172 | int err = 0; |
173 | kgid_t gid; |
174 | umode_t mode; |
175 | int p9_omode = v9fs_open_to_dotl_flags(flags); |
176 | const unsigned char *name = NULL; |
177 | struct p9_qid qid; |
178 | struct inode *inode; |
179 | struct p9_fid *fid = NULL; |
180 | struct p9_fid *dfid = NULL, *ofid = NULL; |
181 | struct v9fs_session_info *v9ses; |
182 | struct posix_acl *pacl = NULL, *dacl = NULL; |
183 | struct dentry *res = NULL; |
184 | |
185 | if (d_in_lookup(dentry)) { |
186 | res = v9fs_vfs_lookup(dir, dentry, flags: 0); |
187 | if (IS_ERR(ptr: res)) |
188 | return PTR_ERR(ptr: res); |
189 | |
190 | if (res) |
191 | dentry = res; |
192 | } |
193 | |
194 | /* Only creates */ |
195 | if (!(flags & O_CREAT) || d_really_is_positive(dentry)) |
196 | return finish_no_open(file, dentry: res); |
197 | |
198 | v9ses = v9fs_inode2v9ses(inode: dir); |
199 | |
200 | name = dentry->d_name.name; |
201 | p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n" , |
202 | name, flags, omode); |
203 | |
204 | dfid = v9fs_parent_fid(dentry); |
205 | if (IS_ERR(ptr: dfid)) { |
206 | err = PTR_ERR(ptr: dfid); |
207 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n" , err); |
208 | goto out; |
209 | } |
210 | |
211 | /* clone a fid to use for creation */ |
212 | ofid = clone_fid(fid: dfid); |
213 | if (IS_ERR(ptr: ofid)) { |
214 | err = PTR_ERR(ptr: ofid); |
215 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n" , err); |
216 | goto out; |
217 | } |
218 | |
219 | gid = v9fs_get_fsgid_for_create(dir_inode: dir); |
220 | |
221 | mode = omode; |
222 | /* Update mode based on ACL value */ |
223 | err = v9fs_acl_mode(dir, modep: &mode, dpacl: &dacl, pacl: &pacl); |
224 | if (err) { |
225 | p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n" , |
226 | err); |
227 | goto out; |
228 | } |
229 | |
230 | if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) { |
231 | p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR; |
232 | p9_debug(P9_DEBUG_CACHE, |
233 | "write-only file with writeback enabled, creating w/ O_RDWR\n" ); |
234 | } |
235 | err = p9_client_create_dotl(ofid, name, flags: p9_omode, mode, gid, qid: &qid); |
236 | if (err < 0) { |
237 | p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n" , |
238 | err); |
239 | goto out; |
240 | } |
241 | v9fs_invalidate_inode_attr(inode: dir); |
242 | |
243 | /* instantiate inode and assign the unopened fid to the dentry */ |
244 | fid = p9_client_walk(oldfid: dfid, nwname: 1, wnames: &name, clone: 1); |
245 | if (IS_ERR(ptr: fid)) { |
246 | err = PTR_ERR(ptr: fid); |
247 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n" , err); |
248 | goto out; |
249 | } |
250 | inode = v9fs_fid_iget_dotl(sb: dir->i_sb, fid); |
251 | if (IS_ERR(ptr: inode)) { |
252 | err = PTR_ERR(ptr: inode); |
253 | p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n" , err); |
254 | goto out; |
255 | } |
256 | /* Now set the ACL based on the default value */ |
257 | v9fs_set_create_acl(inode, fid, dacl, acl: pacl); |
258 | |
259 | v9fs_fid_add(dentry, fid: &fid); |
260 | d_instantiate(dentry, inode); |
261 | |
262 | /* Since we are opening a file, assign the open fid to the file */ |
263 | err = finish_open(file, dentry, open: generic_file_open); |
264 | if (err) |
265 | goto out; |
266 | file->private_data = ofid; |
267 | #ifdef CONFIG_9P_FSCACHE |
268 | if (v9ses->cache & CACHE_FSCACHE) { |
269 | struct v9fs_inode *v9inode = V9FS_I(inode); |
270 | fscache_use_cookie(cookie: v9fs_inode_cookie(v9inode), |
271 | will_modify: file->f_mode & FMODE_WRITE); |
272 | } |
273 | #endif |
274 | v9fs_fid_add_modes(fid: ofid, s_flags: v9ses->flags, s_cache: v9ses->cache, f_flags: flags); |
275 | v9fs_open_fid_add(inode, fid: &ofid); |
276 | file->f_mode |= FMODE_CREATED; |
277 | out: |
278 | p9_fid_put(fid: dfid); |
279 | p9_fid_put(fid: ofid); |
280 | p9_fid_put(fid); |
281 | v9fs_put_acl(dacl, acl: pacl); |
282 | dput(res); |
283 | return err; |
284 | } |
285 | |
286 | /** |
287 | * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory |
288 | * @idmap: The idmap of the mount |
289 | * @dir: inode that is being unlinked |
290 | * @dentry: dentry that is being unlinked |
291 | * @omode: mode for new directory |
292 | * |
293 | */ |
294 | |
295 | static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap, |
296 | struct inode *dir, struct dentry *dentry, |
297 | umode_t omode) |
298 | { |
299 | int err; |
300 | struct p9_fid *fid = NULL, *dfid = NULL; |
301 | kgid_t gid; |
302 | const unsigned char *name; |
303 | umode_t mode; |
304 | struct inode *inode; |
305 | struct p9_qid qid; |
306 | struct posix_acl *dacl = NULL, *pacl = NULL; |
307 | |
308 | p9_debug(P9_DEBUG_VFS, "name %pd\n" , dentry); |
309 | |
310 | omode |= S_IFDIR; |
311 | if (dir->i_mode & S_ISGID) |
312 | omode |= S_ISGID; |
313 | |
314 | dfid = v9fs_parent_fid(dentry); |
315 | if (IS_ERR(ptr: dfid)) { |
316 | err = PTR_ERR(ptr: dfid); |
317 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n" , err); |
318 | goto error; |
319 | } |
320 | |
321 | gid = v9fs_get_fsgid_for_create(dir_inode: dir); |
322 | mode = omode; |
323 | /* Update mode based on ACL value */ |
324 | err = v9fs_acl_mode(dir, modep: &mode, dpacl: &dacl, pacl: &pacl); |
325 | if (err) { |
326 | p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n" , |
327 | err); |
328 | goto error; |
329 | } |
330 | name = dentry->d_name.name; |
331 | err = p9_client_mkdir_dotl(fid: dfid, name, mode, gid, qid: &qid); |
332 | if (err < 0) |
333 | goto error; |
334 | fid = p9_client_walk(oldfid: dfid, nwname: 1, wnames: &name, clone: 1); |
335 | if (IS_ERR(ptr: fid)) { |
336 | err = PTR_ERR(ptr: fid); |
337 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n" , |
338 | err); |
339 | goto error; |
340 | } |
341 | |
342 | /* instantiate inode and assign the unopened fid to the dentry */ |
343 | inode = v9fs_fid_iget_dotl(sb: dir->i_sb, fid); |
344 | if (IS_ERR(ptr: inode)) { |
345 | err = PTR_ERR(ptr: inode); |
346 | p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n" , |
347 | err); |
348 | goto error; |
349 | } |
350 | v9fs_fid_add(dentry, fid: &fid); |
351 | v9fs_set_create_acl(inode, fid, dacl, acl: pacl); |
352 | d_instantiate(dentry, inode); |
353 | err = 0; |
354 | inc_nlink(inode: dir); |
355 | v9fs_invalidate_inode_attr(inode: dir); |
356 | error: |
357 | p9_fid_put(fid); |
358 | v9fs_put_acl(dacl, acl: pacl); |
359 | p9_fid_put(fid: dfid); |
360 | return err; |
361 | } |
362 | |
363 | static int |
364 | v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap, |
365 | const struct path *path, struct kstat *stat, |
366 | u32 request_mask, unsigned int flags) |
367 | { |
368 | struct dentry *dentry = path->dentry; |
369 | struct v9fs_session_info *v9ses; |
370 | struct p9_fid *fid; |
371 | struct inode *inode = d_inode(dentry); |
372 | struct p9_stat_dotl *st; |
373 | |
374 | p9_debug(P9_DEBUG_VFS, "dentry: %p\n" , dentry); |
375 | v9ses = v9fs_dentry2v9ses(dentry); |
376 | if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { |
377 | generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); |
378 | return 0; |
379 | } else if (v9ses->cache) { |
380 | if (S_ISREG(inode->i_mode)) { |
381 | int retval = filemap_fdatawrite(inode->i_mapping); |
382 | |
383 | if (retval) |
384 | p9_debug(P9_DEBUG_ERROR, |
385 | "flushing writeback during getattr returned %d\n" , retval); |
386 | } |
387 | } |
388 | fid = v9fs_fid_lookup(dentry); |
389 | if (IS_ERR(ptr: fid)) |
390 | return PTR_ERR(ptr: fid); |
391 | |
392 | /* Ask for all the fields in stat structure. Server will return |
393 | * whatever it supports |
394 | */ |
395 | |
396 | st = p9_client_getattr_dotl(fid, P9_STATS_ALL); |
397 | p9_fid_put(fid); |
398 | if (IS_ERR(ptr: st)) |
399 | return PTR_ERR(ptr: st); |
400 | |
401 | v9fs_stat2inode_dotl(stat: st, inode: d_inode(dentry), flags: 0); |
402 | generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat); |
403 | /* Change block size to what the server returned */ |
404 | stat->blksize = st->st_blksize; |
405 | |
406 | kfree(objp: st); |
407 | return 0; |
408 | } |
409 | |
410 | /* |
411 | * Attribute flags. |
412 | */ |
413 | #define P9_ATTR_MODE (1 << 0) |
414 | #define P9_ATTR_UID (1 << 1) |
415 | #define P9_ATTR_GID (1 << 2) |
416 | #define P9_ATTR_SIZE (1 << 3) |
417 | #define P9_ATTR_ATIME (1 << 4) |
418 | #define P9_ATTR_MTIME (1 << 5) |
419 | #define P9_ATTR_CTIME (1 << 6) |
420 | #define P9_ATTR_ATIME_SET (1 << 7) |
421 | #define P9_ATTR_MTIME_SET (1 << 8) |
422 | |
423 | struct dotl_iattr_map { |
424 | int iattr_valid; |
425 | int p9_iattr_valid; |
426 | }; |
427 | |
428 | static int v9fs_mapped_iattr_valid(int iattr_valid) |
429 | { |
430 | int i; |
431 | int p9_iattr_valid = 0; |
432 | struct dotl_iattr_map dotl_iattr_map[] = { |
433 | { ATTR_MODE, P9_ATTR_MODE }, |
434 | { ATTR_UID, P9_ATTR_UID }, |
435 | { ATTR_GID, P9_ATTR_GID }, |
436 | { ATTR_SIZE, P9_ATTR_SIZE }, |
437 | { ATTR_ATIME, P9_ATTR_ATIME }, |
438 | { ATTR_MTIME, P9_ATTR_MTIME }, |
439 | { ATTR_CTIME, P9_ATTR_CTIME }, |
440 | { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, |
441 | { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, |
442 | }; |
443 | for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { |
444 | if (iattr_valid & dotl_iattr_map[i].iattr_valid) |
445 | p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; |
446 | } |
447 | return p9_iattr_valid; |
448 | } |
449 | |
450 | /** |
451 | * v9fs_vfs_setattr_dotl - set file metadata |
452 | * @idmap: idmap of the mount |
453 | * @dentry: file whose metadata to set |
454 | * @iattr: metadata assignment structure |
455 | * |
456 | */ |
457 | |
458 | int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap, |
459 | struct dentry *dentry, struct iattr *iattr) |
460 | { |
461 | int retval, use_dentry = 0; |
462 | struct inode *inode = d_inode(dentry); |
463 | struct v9fs_session_info __maybe_unused *v9ses; |
464 | struct p9_fid *fid = NULL; |
465 | struct p9_iattr_dotl p9attr = { |
466 | .uid = INVALID_UID, |
467 | .gid = INVALID_GID, |
468 | }; |
469 | |
470 | p9_debug(P9_DEBUG_VFS, "\n" ); |
471 | |
472 | retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr); |
473 | if (retval) |
474 | return retval; |
475 | |
476 | v9ses = v9fs_dentry2v9ses(dentry); |
477 | |
478 | p9attr.valid = v9fs_mapped_iattr_valid(iattr_valid: iattr->ia_valid); |
479 | if (iattr->ia_valid & ATTR_MODE) |
480 | p9attr.mode = iattr->ia_mode; |
481 | if (iattr->ia_valid & ATTR_UID) |
482 | p9attr.uid = iattr->ia_uid; |
483 | if (iattr->ia_valid & ATTR_GID) |
484 | p9attr.gid = iattr->ia_gid; |
485 | if (iattr->ia_valid & ATTR_SIZE) |
486 | p9attr.size = iattr->ia_size; |
487 | if (iattr->ia_valid & ATTR_ATIME_SET) { |
488 | p9attr.atime_sec = iattr->ia_atime.tv_sec; |
489 | p9attr.atime_nsec = iattr->ia_atime.tv_nsec; |
490 | } |
491 | if (iattr->ia_valid & ATTR_MTIME_SET) { |
492 | p9attr.mtime_sec = iattr->ia_mtime.tv_sec; |
493 | p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; |
494 | } |
495 | |
496 | if (iattr->ia_valid & ATTR_FILE) { |
497 | fid = iattr->ia_file->private_data; |
498 | WARN_ON(!fid); |
499 | } |
500 | if (!fid) { |
501 | fid = v9fs_fid_lookup(dentry); |
502 | use_dentry = 1; |
503 | } |
504 | if (IS_ERR(ptr: fid)) |
505 | return PTR_ERR(ptr: fid); |
506 | |
507 | /* Write all dirty data */ |
508 | if (S_ISREG(inode->i_mode)) { |
509 | retval = filemap_fdatawrite(inode->i_mapping); |
510 | if (retval < 0) |
511 | p9_debug(P9_DEBUG_ERROR, |
512 | "Flushing file prior to setattr failed: %d\n" , retval); |
513 | } |
514 | |
515 | retval = p9_client_setattr(fid, attr: &p9attr); |
516 | if (retval < 0) { |
517 | if (use_dentry) |
518 | p9_fid_put(fid); |
519 | return retval; |
520 | } |
521 | |
522 | if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size != |
523 | i_size_read(inode)) { |
524 | truncate_setsize(inode, newsize: iattr->ia_size); |
525 | netfs_resize_file(ctx: netfs_inode(inode), new_i_size: iattr->ia_size, changed_on_server: true); |
526 | |
527 | #ifdef CONFIG_9P_FSCACHE |
528 | if (v9ses->cache & CACHE_FSCACHE) |
529 | fscache_resize_cookie(cookie: v9fs_inode_cookie(v9inode: V9FS_I(inode)), |
530 | new_size: iattr->ia_size); |
531 | #endif |
532 | } |
533 | |
534 | v9fs_invalidate_inode_attr(inode); |
535 | setattr_copy(&nop_mnt_idmap, inode, attr: iattr); |
536 | mark_inode_dirty(inode); |
537 | if (iattr->ia_valid & ATTR_MODE) { |
538 | /* We also want to update ACL when we update mode bits */ |
539 | retval = v9fs_acl_chmod(inode, fid); |
540 | if (retval < 0) { |
541 | if (use_dentry) |
542 | p9_fid_put(fid); |
543 | return retval; |
544 | } |
545 | } |
546 | if (use_dentry) |
547 | p9_fid_put(fid); |
548 | |
549 | return 0; |
550 | } |
551 | |
552 | /** |
553 | * v9fs_stat2inode_dotl - populate an inode structure with stat info |
554 | * @stat: stat structure |
555 | * @inode: inode to populate |
556 | * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) |
557 | * |
558 | */ |
559 | |
560 | void |
561 | v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, |
562 | unsigned int flags) |
563 | { |
564 | umode_t mode; |
565 | struct v9fs_inode *v9inode = V9FS_I(inode); |
566 | |
567 | if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { |
568 | inode_set_atime(inode, sec: stat->st_atime_sec, |
569 | nsec: stat->st_atime_nsec); |
570 | inode_set_mtime(inode, sec: stat->st_mtime_sec, |
571 | nsec: stat->st_mtime_nsec); |
572 | inode_set_ctime(inode, sec: stat->st_ctime_sec, |
573 | nsec: stat->st_ctime_nsec); |
574 | inode->i_uid = stat->st_uid; |
575 | inode->i_gid = stat->st_gid; |
576 | set_nlink(inode, nlink: stat->st_nlink); |
577 | |
578 | mode = stat->st_mode & S_IALLUGO; |
579 | mode |= inode->i_mode & ~S_IALLUGO; |
580 | inode->i_mode = mode; |
581 | |
582 | v9inode->netfs.remote_i_size = stat->st_size; |
583 | if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) |
584 | v9fs_i_size_write(inode, i_size: stat->st_size); |
585 | inode->i_blocks = stat->st_blocks; |
586 | } else { |
587 | if (stat->st_result_mask & P9_STATS_ATIME) { |
588 | inode_set_atime(inode, sec: stat->st_atime_sec, |
589 | nsec: stat->st_atime_nsec); |
590 | } |
591 | if (stat->st_result_mask & P9_STATS_MTIME) { |
592 | inode_set_mtime(inode, sec: stat->st_mtime_sec, |
593 | nsec: stat->st_mtime_nsec); |
594 | } |
595 | if (stat->st_result_mask & P9_STATS_CTIME) { |
596 | inode_set_ctime(inode, sec: stat->st_ctime_sec, |
597 | nsec: stat->st_ctime_nsec); |
598 | } |
599 | if (stat->st_result_mask & P9_STATS_UID) |
600 | inode->i_uid = stat->st_uid; |
601 | if (stat->st_result_mask & P9_STATS_GID) |
602 | inode->i_gid = stat->st_gid; |
603 | if (stat->st_result_mask & P9_STATS_NLINK) |
604 | set_nlink(inode, nlink: stat->st_nlink); |
605 | if (stat->st_result_mask & P9_STATS_MODE) { |
606 | mode = stat->st_mode & S_IALLUGO; |
607 | mode |= inode->i_mode & ~S_IALLUGO; |
608 | inode->i_mode = mode; |
609 | } |
610 | if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && |
611 | stat->st_result_mask & P9_STATS_SIZE) { |
612 | v9inode->netfs.remote_i_size = stat->st_size; |
613 | v9fs_i_size_write(inode, i_size: stat->st_size); |
614 | } |
615 | if (stat->st_result_mask & P9_STATS_BLOCKS) |
616 | inode->i_blocks = stat->st_blocks; |
617 | } |
618 | if (stat->st_result_mask & P9_STATS_GEN) |
619 | inode->i_generation = stat->st_gen; |
620 | |
621 | /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION |
622 | * because the inode structure does not have fields for them. |
623 | */ |
624 | v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; |
625 | } |
626 | |
627 | static int |
628 | v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir, |
629 | struct dentry *dentry, const char *symname) |
630 | { |
631 | int err; |
632 | kgid_t gid; |
633 | const unsigned char *name; |
634 | struct p9_qid qid; |
635 | struct p9_fid *dfid; |
636 | struct p9_fid *fid = NULL; |
637 | |
638 | name = dentry->d_name.name; |
639 | p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n" , dir->i_ino, name, symname); |
640 | |
641 | dfid = v9fs_parent_fid(dentry); |
642 | if (IS_ERR(ptr: dfid)) { |
643 | err = PTR_ERR(ptr: dfid); |
644 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n" , err); |
645 | return err; |
646 | } |
647 | |
648 | gid = v9fs_get_fsgid_for_create(dir_inode: dir); |
649 | |
650 | /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ |
651 | err = p9_client_symlink(fid: dfid, name, symname, gid, qid: &qid); |
652 | |
653 | if (err < 0) { |
654 | p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n" , err); |
655 | goto error; |
656 | } |
657 | |
658 | v9fs_invalidate_inode_attr(inode: dir); |
659 | |
660 | error: |
661 | p9_fid_put(fid); |
662 | p9_fid_put(fid: dfid); |
663 | return err; |
664 | } |
665 | |
666 | /** |
667 | * v9fs_vfs_link_dotl - create a hardlink for dotl |
668 | * @old_dentry: dentry for file to link to |
669 | * @dir: inode destination for new link |
670 | * @dentry: dentry for link |
671 | * |
672 | */ |
673 | |
674 | static int |
675 | v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, |
676 | struct dentry *dentry) |
677 | { |
678 | int err; |
679 | struct p9_fid *dfid, *oldfid; |
680 | struct v9fs_session_info *v9ses; |
681 | |
682 | p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n" , |
683 | dir->i_ino, old_dentry, dentry); |
684 | |
685 | v9ses = v9fs_inode2v9ses(inode: dir); |
686 | dfid = v9fs_parent_fid(dentry); |
687 | if (IS_ERR(ptr: dfid)) |
688 | return PTR_ERR(ptr: dfid); |
689 | |
690 | oldfid = v9fs_fid_lookup(dentry: old_dentry); |
691 | if (IS_ERR(ptr: oldfid)) { |
692 | p9_fid_put(fid: dfid); |
693 | return PTR_ERR(ptr: oldfid); |
694 | } |
695 | |
696 | err = p9_client_link(fid: dfid, oldfid, newname: dentry->d_name.name); |
697 | |
698 | p9_fid_put(fid: dfid); |
699 | p9_fid_put(fid: oldfid); |
700 | if (err < 0) { |
701 | p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n" , err); |
702 | return err; |
703 | } |
704 | |
705 | v9fs_invalidate_inode_attr(inode: dir); |
706 | if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { |
707 | /* Get the latest stat info from server. */ |
708 | struct p9_fid *fid; |
709 | |
710 | fid = v9fs_fid_lookup(dentry: old_dentry); |
711 | if (IS_ERR(ptr: fid)) |
712 | return PTR_ERR(ptr: fid); |
713 | |
714 | v9fs_refresh_inode_dotl(fid, inode: d_inode(dentry: old_dentry)); |
715 | p9_fid_put(fid); |
716 | } |
717 | ihold(inode: d_inode(dentry: old_dentry)); |
718 | d_instantiate(dentry, d_inode(dentry: old_dentry)); |
719 | |
720 | return err; |
721 | } |
722 | |
723 | /** |
724 | * v9fs_vfs_mknod_dotl - create a special file |
725 | * @idmap: The idmap of the mount |
726 | * @dir: inode destination for new link |
727 | * @dentry: dentry for file |
728 | * @omode: mode for creation |
729 | * @rdev: device associated with special file |
730 | * |
731 | */ |
732 | static int |
733 | v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir, |
734 | struct dentry *dentry, umode_t omode, dev_t rdev) |
735 | { |
736 | int err; |
737 | kgid_t gid; |
738 | const unsigned char *name; |
739 | umode_t mode; |
740 | struct p9_fid *fid = NULL, *dfid = NULL; |
741 | struct inode *inode; |
742 | struct p9_qid qid; |
743 | struct posix_acl *dacl = NULL, *pacl = NULL; |
744 | |
745 | p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n" , |
746 | dir->i_ino, dentry, omode, |
747 | MAJOR(rdev), MINOR(rdev)); |
748 | |
749 | dfid = v9fs_parent_fid(dentry); |
750 | if (IS_ERR(ptr: dfid)) { |
751 | err = PTR_ERR(ptr: dfid); |
752 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n" , err); |
753 | goto error; |
754 | } |
755 | |
756 | gid = v9fs_get_fsgid_for_create(dir_inode: dir); |
757 | mode = omode; |
758 | /* Update mode based on ACL value */ |
759 | err = v9fs_acl_mode(dir, modep: &mode, dpacl: &dacl, pacl: &pacl); |
760 | if (err) { |
761 | p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n" , |
762 | err); |
763 | goto error; |
764 | } |
765 | name = dentry->d_name.name; |
766 | |
767 | err = p9_client_mknod_dotl(oldfid: dfid, name, mode, rdev, gid, qid: &qid); |
768 | if (err < 0) |
769 | goto error; |
770 | |
771 | v9fs_invalidate_inode_attr(inode: dir); |
772 | fid = p9_client_walk(oldfid: dfid, nwname: 1, wnames: &name, clone: 1); |
773 | if (IS_ERR(ptr: fid)) { |
774 | err = PTR_ERR(ptr: fid); |
775 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n" , |
776 | err); |
777 | goto error; |
778 | } |
779 | inode = v9fs_fid_iget_dotl(sb: dir->i_sb, fid); |
780 | if (IS_ERR(ptr: inode)) { |
781 | err = PTR_ERR(ptr: inode); |
782 | p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n" , |
783 | err); |
784 | goto error; |
785 | } |
786 | v9fs_set_create_acl(inode, fid, dacl, acl: pacl); |
787 | v9fs_fid_add(dentry, fid: &fid); |
788 | d_instantiate(dentry, inode); |
789 | err = 0; |
790 | error: |
791 | p9_fid_put(fid); |
792 | v9fs_put_acl(dacl, acl: pacl); |
793 | p9_fid_put(fid: dfid); |
794 | |
795 | return err; |
796 | } |
797 | |
798 | /** |
799 | * v9fs_vfs_get_link_dotl - follow a symlink path |
800 | * @dentry: dentry for symlink |
801 | * @inode: inode for symlink |
802 | * @done: destructor for return value |
803 | */ |
804 | |
805 | static const char * |
806 | v9fs_vfs_get_link_dotl(struct dentry *dentry, |
807 | struct inode *inode, |
808 | struct delayed_call *done) |
809 | { |
810 | struct p9_fid *fid; |
811 | char *target; |
812 | int retval; |
813 | |
814 | if (!dentry) |
815 | return ERR_PTR(error: -ECHILD); |
816 | |
817 | p9_debug(P9_DEBUG_VFS, "%pd\n" , dentry); |
818 | |
819 | fid = v9fs_fid_lookup(dentry); |
820 | if (IS_ERR(ptr: fid)) |
821 | return ERR_CAST(ptr: fid); |
822 | retval = p9_client_readlink(fid, target: &target); |
823 | p9_fid_put(fid); |
824 | if (retval) |
825 | return ERR_PTR(error: retval); |
826 | set_delayed_call(call: done, fn: kfree_link, arg: target); |
827 | return target; |
828 | } |
829 | |
830 | int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) |
831 | { |
832 | struct p9_stat_dotl *st; |
833 | struct v9fs_session_info *v9ses; |
834 | unsigned int flags; |
835 | |
836 | v9ses = v9fs_inode2v9ses(inode); |
837 | st = p9_client_getattr_dotl(fid, P9_STATS_ALL); |
838 | if (IS_ERR(ptr: st)) |
839 | return PTR_ERR(ptr: st); |
840 | /* |
841 | * Don't update inode if the file type is different |
842 | */ |
843 | if (inode_wrong_type(inode, mode: st->st_mode)) |
844 | goto out; |
845 | |
846 | /* |
847 | * We don't want to refresh inode->i_size, |
848 | * because we may have cached data |
849 | */ |
850 | flags = (v9ses->cache & CACHE_LOOSE) ? |
851 | V9FS_STAT2INODE_KEEP_ISIZE : 0; |
852 | v9fs_stat2inode_dotl(stat: st, inode, flags); |
853 | out: |
854 | kfree(objp: st); |
855 | return 0; |
856 | } |
857 | |
858 | const struct inode_operations v9fs_dir_inode_operations_dotl = { |
859 | .create = v9fs_vfs_create_dotl, |
860 | .atomic_open = v9fs_vfs_atomic_open_dotl, |
861 | .lookup = v9fs_vfs_lookup, |
862 | .link = v9fs_vfs_link_dotl, |
863 | .symlink = v9fs_vfs_symlink_dotl, |
864 | .unlink = v9fs_vfs_unlink, |
865 | .mkdir = v9fs_vfs_mkdir_dotl, |
866 | .rmdir = v9fs_vfs_rmdir, |
867 | .mknod = v9fs_vfs_mknod_dotl, |
868 | .rename = v9fs_vfs_rename, |
869 | .getattr = v9fs_vfs_getattr_dotl, |
870 | .setattr = v9fs_vfs_setattr_dotl, |
871 | .listxattr = v9fs_listxattr, |
872 | .get_inode_acl = v9fs_iop_get_inode_acl, |
873 | .get_acl = v9fs_iop_get_acl, |
874 | .set_acl = v9fs_iop_set_acl, |
875 | }; |
876 | |
877 | const struct inode_operations v9fs_file_inode_operations_dotl = { |
878 | .getattr = v9fs_vfs_getattr_dotl, |
879 | .setattr = v9fs_vfs_setattr_dotl, |
880 | .listxattr = v9fs_listxattr, |
881 | .get_inode_acl = v9fs_iop_get_inode_acl, |
882 | .get_acl = v9fs_iop_get_acl, |
883 | .set_acl = v9fs_iop_set_acl, |
884 | }; |
885 | |
886 | const struct inode_operations v9fs_symlink_inode_operations_dotl = { |
887 | .get_link = v9fs_vfs_get_link_dotl, |
888 | .getattr = v9fs_vfs_getattr_dotl, |
889 | .setattr = v9fs_vfs_setattr_dotl, |
890 | .listxattr = v9fs_listxattr, |
891 | }; |
892 | |