1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/9p/vfs_inode_dotl.c
4 *
5 * This file contains vfs inode ops for the 9P2000.L protocol.
6 *
7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 */
10
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>
18 #include <linux/inet.h>
19 #include <linux/namei.h>
20 #include <linux/idr.h>
21 #include <linux/sched.h>
22 #include <linux/slab.h>
23 #include <linux/xattr.h>
24 #include <linux/posix_acl.h>
25 #include <net/9p/9p.h>
26 #include <net/9p/client.h>
27
28 #include "v9fs.h"
29 #include "v9fs_vfs.h"
30 #include "fid.h"
31 #include "cache.h"
32 #include "xattr.h"
33 #include "acl.h"
34
35 static int
36 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
37 dev_t rdev);
38
39 /**
40 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
41 * new file system object. This checks the S_ISGID to determine the owning
42 * group of the new file system object.
43 */
44
v9fs_get_fsgid_for_create(struct inode * dir_inode)45 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
46 {
47 BUG_ON(dir_inode == NULL);
48
49 if (dir_inode->i_mode & S_ISGID) {
50 /* set_gid bit is set.*/
51 return dir_inode->i_gid;
52 }
53 return current_fsgid();
54 }
55
v9fs_test_inode_dotl(struct inode * inode,void * data)56 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
57 {
58 struct v9fs_inode *v9inode = V9FS_I(inode);
59 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
60
61 /* don't match inode of different type */
62 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
63 return 0;
64
65 if (inode->i_generation != st->st_gen)
66 return 0;
67
68 /* compare qid details */
69 if (memcmp(&v9inode->qid.version,
70 &st->qid.version, sizeof(v9inode->qid.version)))
71 return 0;
72
73 if (v9inode->qid.type != st->qid.type)
74 return 0;
75
76 if (v9inode->qid.path != st->qid.path)
77 return 0;
78 return 1;
79 }
80
81 /* Always get a new inode */
v9fs_test_new_inode_dotl(struct inode * inode,void * data)82 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
83 {
84 return 0;
85 }
86
v9fs_set_inode_dotl(struct inode * inode,void * data)87 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
88 {
89 struct v9fs_inode *v9inode = V9FS_I(inode);
90 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
91
92 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
93 inode->i_generation = st->st_gen;
94 return 0;
95 }
96
v9fs_qid_iget_dotl(struct super_block * sb,struct p9_qid * qid,struct p9_fid * fid,struct p9_stat_dotl * st,int new)97 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
98 struct p9_qid *qid,
99 struct p9_fid *fid,
100 struct p9_stat_dotl *st,
101 int new)
102 {
103 int retval;
104 unsigned long i_ino;
105 struct inode *inode;
106 struct v9fs_session_info *v9ses = sb->s_fs_info;
107 int (*test)(struct inode *, void *);
108
109 if (new)
110 test = v9fs_test_new_inode_dotl;
111 else
112 test = v9fs_test_inode_dotl;
113
114 i_ino = v9fs_qid2ino(qid);
115 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
116 if (!inode)
117 return ERR_PTR(-ENOMEM);
118 if (!(inode->i_state & I_NEW))
119 return inode;
120 /*
121 * initialize the inode with the stat info
122 * FIXME!! we may need support for stale inodes
123 * later.
124 */
125 inode->i_ino = i_ino;
126 retval = v9fs_init_inode(v9ses, inode,
127 st->st_mode, new_decode_dev(st->st_rdev));
128 if (retval)
129 goto error;
130
131 v9fs_stat2inode_dotl(st, inode, 0);
132 v9fs_cache_inode_get_cookie(inode);
133 retval = v9fs_get_acl(inode, fid);
134 if (retval)
135 goto error;
136
137 unlock_new_inode(inode);
138 return inode;
139 error:
140 iget_failed(inode);
141 return ERR_PTR(retval);
142
143 }
144
145 struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info * v9ses,struct p9_fid * fid,struct super_block * sb,int new)146 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
147 struct super_block *sb, int new)
148 {
149 struct p9_stat_dotl *st;
150 struct inode *inode = NULL;
151
152 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
153 if (IS_ERR(st))
154 return ERR_CAST(st);
155
156 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
157 kfree(st);
158 return inode;
159 }
160
161 struct dotl_openflag_map {
162 int open_flag;
163 int dotl_flag;
164 };
165
v9fs_mapped_dotl_flags(int flags)166 static int v9fs_mapped_dotl_flags(int flags)
167 {
168 int i;
169 int rflags = 0;
170 struct dotl_openflag_map dotl_oflag_map[] = {
171 { O_CREAT, P9_DOTL_CREATE },
172 { O_EXCL, P9_DOTL_EXCL },
173 { O_NOCTTY, P9_DOTL_NOCTTY },
174 { O_APPEND, P9_DOTL_APPEND },
175 { O_NONBLOCK, P9_DOTL_NONBLOCK },
176 { O_DSYNC, P9_DOTL_DSYNC },
177 { FASYNC, P9_DOTL_FASYNC },
178 { O_DIRECT, P9_DOTL_DIRECT },
179 { O_LARGEFILE, P9_DOTL_LARGEFILE },
180 { O_DIRECTORY, P9_DOTL_DIRECTORY },
181 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
182 { O_NOATIME, P9_DOTL_NOATIME },
183 { O_CLOEXEC, P9_DOTL_CLOEXEC },
184 { O_SYNC, P9_DOTL_SYNC},
185 };
186 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
187 if (flags & dotl_oflag_map[i].open_flag)
188 rflags |= dotl_oflag_map[i].dotl_flag;
189 }
190 return rflags;
191 }
192
193 /**
194 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
195 * plan 9 open flag.
196 * @flags: flags to convert
197 */
v9fs_open_to_dotl_flags(int flags)198 int v9fs_open_to_dotl_flags(int flags)
199 {
200 int rflags = 0;
201
202 /*
203 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
204 * and P9_DOTL_NOACCESS
205 */
206 rflags |= flags & O_ACCMODE;
207 rflags |= v9fs_mapped_dotl_flags(flags);
208
209 return rflags;
210 }
211
212 /**
213 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
214 * @dir: directory inode that is being created
215 * @dentry: dentry that is being deleted
216 * @omode: create permissions
217 *
218 */
219
220 static int
v9fs_vfs_create_dotl(struct inode * dir,struct dentry * dentry,umode_t omode,bool excl)221 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
222 bool excl)
223 {
224 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
225 }
226
227 static int
v9fs_vfs_atomic_open_dotl(struct inode * dir,struct dentry * dentry,struct file * file,unsigned flags,umode_t omode)228 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
229 struct file *file, unsigned flags, umode_t omode)
230 {
231 int err = 0;
232 kgid_t gid;
233 umode_t mode;
234 const unsigned char *name = NULL;
235 struct p9_qid qid;
236 struct inode *inode;
237 struct p9_fid *fid = NULL;
238 struct v9fs_inode *v9inode;
239 struct p9_fid *dfid, *ofid, *inode_fid;
240 struct v9fs_session_info *v9ses;
241 struct posix_acl *pacl = NULL, *dacl = NULL;
242 struct dentry *res = NULL;
243
244 if (d_in_lookup(dentry)) {
245 res = v9fs_vfs_lookup(dir, dentry, 0);
246 if (IS_ERR(res))
247 return PTR_ERR(res);
248
249 if (res)
250 dentry = res;
251 }
252
253 /* Only creates */
254 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
255 return finish_no_open(file, res);
256
257 v9ses = v9fs_inode2v9ses(dir);
258
259 name = dentry->d_name.name;
260 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
261 name, flags, omode);
262
263 dfid = v9fs_parent_fid(dentry);
264 if (IS_ERR(dfid)) {
265 err = PTR_ERR(dfid);
266 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
267 goto out;
268 }
269
270 /* clone a fid to use for creation */
271 ofid = clone_fid(dfid);
272 if (IS_ERR(ofid)) {
273 err = PTR_ERR(ofid);
274 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
275 goto out;
276 }
277
278 gid = v9fs_get_fsgid_for_create(dir);
279
280 mode = omode;
281 /* Update mode based on ACL value */
282 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
283 if (err) {
284 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
285 err);
286 goto error;
287 }
288 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
289 mode, gid, &qid);
290 if (err < 0) {
291 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
292 err);
293 goto error;
294 }
295 v9fs_invalidate_inode_attr(dir);
296
297 /* instantiate inode and assign the unopened fid to the dentry */
298 fid = p9_client_walk(dfid, 1, &name, 1);
299 if (IS_ERR(fid)) {
300 err = PTR_ERR(fid);
301 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
302 fid = NULL;
303 goto error;
304 }
305 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
306 if (IS_ERR(inode)) {
307 err = PTR_ERR(inode);
308 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
309 goto error;
310 }
311 /* Now set the ACL based on the default value */
312 v9fs_set_create_acl(inode, fid, dacl, pacl);
313
314 v9fs_fid_add(dentry, fid);
315 d_instantiate(dentry, inode);
316
317 v9inode = V9FS_I(inode);
318 mutex_lock(&v9inode->v_mutex);
319 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
320 !v9inode->writeback_fid &&
321 ((flags & O_ACCMODE) != O_RDONLY)) {
322 /*
323 * clone a fid and add it to writeback_fid
324 * we do it during open time instead of
325 * page dirty time via write_begin/page_mkwrite
326 * because we want write after unlink usecase
327 * to work.
328 */
329 inode_fid = v9fs_writeback_fid(dentry);
330 if (IS_ERR(inode_fid)) {
331 err = PTR_ERR(inode_fid);
332 mutex_unlock(&v9inode->v_mutex);
333 goto err_clunk_old_fid;
334 }
335 v9inode->writeback_fid = (void *) inode_fid;
336 }
337 mutex_unlock(&v9inode->v_mutex);
338 /* Since we are opening a file, assign the open fid to the file */
339 err = finish_open(file, dentry, generic_file_open);
340 if (err)
341 goto err_clunk_old_fid;
342 file->private_data = ofid;
343 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
344 v9fs_cache_inode_set_cookie(inode, file);
345 file->f_mode |= FMODE_CREATED;
346 out:
347 v9fs_put_acl(dacl, pacl);
348 dput(res);
349 return err;
350
351 error:
352 if (fid)
353 p9_client_clunk(fid);
354 err_clunk_old_fid:
355 if (ofid)
356 p9_client_clunk(ofid);
357 goto out;
358 }
359
360 /**
361 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
362 * @dir: inode that is being unlinked
363 * @dentry: dentry that is being unlinked
364 * @omode: mode for new directory
365 *
366 */
367
v9fs_vfs_mkdir_dotl(struct inode * dir,struct dentry * dentry,umode_t omode)368 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
369 struct dentry *dentry, umode_t omode)
370 {
371 int err;
372 struct v9fs_session_info *v9ses;
373 struct p9_fid *fid = NULL, *dfid = NULL;
374 kgid_t gid;
375 const unsigned char *name;
376 umode_t mode;
377 struct inode *inode;
378 struct p9_qid qid;
379 struct posix_acl *dacl = NULL, *pacl = NULL;
380
381 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
382 err = 0;
383 v9ses = v9fs_inode2v9ses(dir);
384
385 omode |= S_IFDIR;
386 if (dir->i_mode & S_ISGID)
387 omode |= S_ISGID;
388
389 dfid = v9fs_parent_fid(dentry);
390 if (IS_ERR(dfid)) {
391 err = PTR_ERR(dfid);
392 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
393 dfid = NULL;
394 goto error;
395 }
396
397 gid = v9fs_get_fsgid_for_create(dir);
398 mode = omode;
399 /* Update mode based on ACL value */
400 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
401 if (err) {
402 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
403 err);
404 goto error;
405 }
406 name = dentry->d_name.name;
407 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
408 if (err < 0)
409 goto error;
410
411 fid = p9_client_walk(dfid, 1, &name, 1);
412 if (IS_ERR(fid)) {
413 err = PTR_ERR(fid);
414 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
415 err);
416 fid = NULL;
417 goto error;
418 }
419
420 /* instantiate inode and assign the unopened fid to the dentry */
421 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
422 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
423 if (IS_ERR(inode)) {
424 err = PTR_ERR(inode);
425 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
426 err);
427 goto error;
428 }
429 v9fs_fid_add(dentry, fid);
430 v9fs_set_create_acl(inode, fid, dacl, pacl);
431 d_instantiate(dentry, inode);
432 fid = NULL;
433 err = 0;
434 } else {
435 /*
436 * Not in cached mode. No need to populate
437 * inode with stat. We need to get an inode
438 * so that we can set the acl with dentry
439 */
440 inode = v9fs_get_inode(dir->i_sb, mode, 0);
441 if (IS_ERR(inode)) {
442 err = PTR_ERR(inode);
443 goto error;
444 }
445 v9fs_set_create_acl(inode, fid, dacl, pacl);
446 d_instantiate(dentry, inode);
447 }
448 inc_nlink(dir);
449 v9fs_invalidate_inode_attr(dir);
450 error:
451 if (fid)
452 p9_client_clunk(fid);
453 v9fs_put_acl(dacl, pacl);
454 return err;
455 }
456
457 static int
v9fs_vfs_getattr_dotl(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)458 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
459 u32 request_mask, unsigned int flags)
460 {
461 struct dentry *dentry = path->dentry;
462 struct v9fs_session_info *v9ses;
463 struct p9_fid *fid;
464 struct p9_stat_dotl *st;
465
466 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
467 v9ses = v9fs_dentry2v9ses(dentry);
468 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
469 generic_fillattr(d_inode(dentry), stat);
470 return 0;
471 }
472 fid = v9fs_fid_lookup(dentry);
473 if (IS_ERR(fid))
474 return PTR_ERR(fid);
475
476 /* Ask for all the fields in stat structure. Server will return
477 * whatever it supports
478 */
479
480 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
481 if (IS_ERR(st))
482 return PTR_ERR(st);
483
484 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
485 generic_fillattr(d_inode(dentry), stat);
486 /* Change block size to what the server returned */
487 stat->blksize = st->st_blksize;
488
489 kfree(st);
490 return 0;
491 }
492
493 /*
494 * Attribute flags.
495 */
496 #define P9_ATTR_MODE (1 << 0)
497 #define P9_ATTR_UID (1 << 1)
498 #define P9_ATTR_GID (1 << 2)
499 #define P9_ATTR_SIZE (1 << 3)
500 #define P9_ATTR_ATIME (1 << 4)
501 #define P9_ATTR_MTIME (1 << 5)
502 #define P9_ATTR_CTIME (1 << 6)
503 #define P9_ATTR_ATIME_SET (1 << 7)
504 #define P9_ATTR_MTIME_SET (1 << 8)
505
506 struct dotl_iattr_map {
507 int iattr_valid;
508 int p9_iattr_valid;
509 };
510
v9fs_mapped_iattr_valid(int iattr_valid)511 static int v9fs_mapped_iattr_valid(int iattr_valid)
512 {
513 int i;
514 int p9_iattr_valid = 0;
515 struct dotl_iattr_map dotl_iattr_map[] = {
516 { ATTR_MODE, P9_ATTR_MODE },
517 { ATTR_UID, P9_ATTR_UID },
518 { ATTR_GID, P9_ATTR_GID },
519 { ATTR_SIZE, P9_ATTR_SIZE },
520 { ATTR_ATIME, P9_ATTR_ATIME },
521 { ATTR_MTIME, P9_ATTR_MTIME },
522 { ATTR_CTIME, P9_ATTR_CTIME },
523 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
524 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
525 };
526 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
527 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
528 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
529 }
530 return p9_iattr_valid;
531 }
532
533 /**
534 * v9fs_vfs_setattr_dotl - set file metadata
535 * @dentry: file whose metadata to set
536 * @iattr: metadata assignment structure
537 *
538 */
539
v9fs_vfs_setattr_dotl(struct dentry * dentry,struct iattr * iattr)540 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
541 {
542 int retval;
543 struct p9_fid *fid;
544 struct p9_iattr_dotl p9attr;
545 struct inode *inode = d_inode(dentry);
546
547 p9_debug(P9_DEBUG_VFS, "\n");
548
549 retval = setattr_prepare(dentry, iattr);
550 if (retval)
551 return retval;
552
553 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
554 p9attr.mode = iattr->ia_mode;
555 p9attr.uid = iattr->ia_uid;
556 p9attr.gid = iattr->ia_gid;
557 p9attr.size = iattr->ia_size;
558 p9attr.atime_sec = iattr->ia_atime.tv_sec;
559 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
560 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
561 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
562
563 fid = v9fs_fid_lookup(dentry);
564 if (IS_ERR(fid))
565 return PTR_ERR(fid);
566
567 /* Write all dirty data */
568 if (S_ISREG(inode->i_mode))
569 filemap_write_and_wait(inode->i_mapping);
570
571 retval = p9_client_setattr(fid, &p9attr);
572 if (retval < 0)
573 return retval;
574
575 if ((iattr->ia_valid & ATTR_SIZE) &&
576 iattr->ia_size != i_size_read(inode))
577 truncate_setsize(inode, iattr->ia_size);
578
579 v9fs_invalidate_inode_attr(inode);
580 setattr_copy(inode, iattr);
581 mark_inode_dirty(inode);
582 if (iattr->ia_valid & ATTR_MODE) {
583 /* We also want to update ACL when we update mode bits */
584 retval = v9fs_acl_chmod(inode, fid);
585 if (retval < 0)
586 return retval;
587 }
588 return 0;
589 }
590
591 /**
592 * v9fs_stat2inode_dotl - populate an inode structure with stat info
593 * @stat: stat structure
594 * @inode: inode to populate
595 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
596 *
597 */
598
599 void
v9fs_stat2inode_dotl(struct p9_stat_dotl * stat,struct inode * inode,unsigned int flags)600 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
601 unsigned int flags)
602 {
603 umode_t mode;
604 struct v9fs_inode *v9inode = V9FS_I(inode);
605
606 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
607 inode->i_atime.tv_sec = stat->st_atime_sec;
608 inode->i_atime.tv_nsec = stat->st_atime_nsec;
609 inode->i_mtime.tv_sec = stat->st_mtime_sec;
610 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
611 inode->i_ctime.tv_sec = stat->st_ctime_sec;
612 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
613 inode->i_uid = stat->st_uid;
614 inode->i_gid = stat->st_gid;
615 set_nlink(inode, stat->st_nlink);
616
617 mode = stat->st_mode & S_IALLUGO;
618 mode |= inode->i_mode & ~S_IALLUGO;
619 inode->i_mode = mode;
620
621 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
622 v9fs_i_size_write(inode, stat->st_size);
623 inode->i_blocks = stat->st_blocks;
624 } else {
625 if (stat->st_result_mask & P9_STATS_ATIME) {
626 inode->i_atime.tv_sec = stat->st_atime_sec;
627 inode->i_atime.tv_nsec = stat->st_atime_nsec;
628 }
629 if (stat->st_result_mask & P9_STATS_MTIME) {
630 inode->i_mtime.tv_sec = stat->st_mtime_sec;
631 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
632 }
633 if (stat->st_result_mask & P9_STATS_CTIME) {
634 inode->i_ctime.tv_sec = stat->st_ctime_sec;
635 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
636 }
637 if (stat->st_result_mask & P9_STATS_UID)
638 inode->i_uid = stat->st_uid;
639 if (stat->st_result_mask & P9_STATS_GID)
640 inode->i_gid = stat->st_gid;
641 if (stat->st_result_mask & P9_STATS_NLINK)
642 set_nlink(inode, stat->st_nlink);
643 if (stat->st_result_mask & P9_STATS_MODE) {
644 mode = stat->st_mode & S_IALLUGO;
645 mode |= inode->i_mode & ~S_IALLUGO;
646 inode->i_mode = mode;
647 }
648 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
649 stat->st_result_mask & P9_STATS_SIZE)
650 v9fs_i_size_write(inode, stat->st_size);
651 if (stat->st_result_mask & P9_STATS_BLOCKS)
652 inode->i_blocks = stat->st_blocks;
653 }
654 if (stat->st_result_mask & P9_STATS_GEN)
655 inode->i_generation = stat->st_gen;
656
657 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
658 * because the inode structure does not have fields for them.
659 */
660 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
661 }
662
663 static int
v9fs_vfs_symlink_dotl(struct inode * dir,struct dentry * dentry,const char * symname)664 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
665 const char *symname)
666 {
667 int err;
668 kgid_t gid;
669 const unsigned char *name;
670 struct p9_qid qid;
671 struct inode *inode;
672 struct p9_fid *dfid;
673 struct p9_fid *fid = NULL;
674 struct v9fs_session_info *v9ses;
675
676 name = dentry->d_name.name;
677 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
678 v9ses = v9fs_inode2v9ses(dir);
679
680 dfid = v9fs_parent_fid(dentry);
681 if (IS_ERR(dfid)) {
682 err = PTR_ERR(dfid);
683 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
684 return err;
685 }
686
687 gid = v9fs_get_fsgid_for_create(dir);
688
689 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
690 err = p9_client_symlink(dfid, name, symname, gid, &qid);
691
692 if (err < 0) {
693 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
694 goto error;
695 }
696
697 v9fs_invalidate_inode_attr(dir);
698 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
699 /* Now walk from the parent so we can get an unopened fid. */
700 fid = p9_client_walk(dfid, 1, &name, 1);
701 if (IS_ERR(fid)) {
702 err = PTR_ERR(fid);
703 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
704 err);
705 fid = NULL;
706 goto error;
707 }
708
709 /* instantiate inode and assign the unopened fid to dentry */
710 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
711 if (IS_ERR(inode)) {
712 err = PTR_ERR(inode);
713 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
714 err);
715 goto error;
716 }
717 v9fs_fid_add(dentry, fid);
718 d_instantiate(dentry, inode);
719 fid = NULL;
720 err = 0;
721 } else {
722 /* Not in cached mode. No need to populate inode with stat */
723 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
724 if (IS_ERR(inode)) {
725 err = PTR_ERR(inode);
726 goto error;
727 }
728 d_instantiate(dentry, inode);
729 }
730
731 error:
732 if (fid)
733 p9_client_clunk(fid);
734
735 return err;
736 }
737
738 /**
739 * v9fs_vfs_link_dotl - create a hardlink for dotl
740 * @old_dentry: dentry for file to link to
741 * @dir: inode destination for new link
742 * @dentry: dentry for link
743 *
744 */
745
746 static int
v9fs_vfs_link_dotl(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)747 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
748 struct dentry *dentry)
749 {
750 int err;
751 struct p9_fid *dfid, *oldfid;
752 struct v9fs_session_info *v9ses;
753
754 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
755 dir->i_ino, old_dentry, dentry);
756
757 v9ses = v9fs_inode2v9ses(dir);
758 dfid = v9fs_parent_fid(dentry);
759 if (IS_ERR(dfid))
760 return PTR_ERR(dfid);
761
762 oldfid = v9fs_fid_lookup(old_dentry);
763 if (IS_ERR(oldfid))
764 return PTR_ERR(oldfid);
765
766 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
767
768 if (err < 0) {
769 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
770 return err;
771 }
772
773 v9fs_invalidate_inode_attr(dir);
774 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
775 /* Get the latest stat info from server. */
776 struct p9_fid *fid;
777 fid = v9fs_fid_lookup(old_dentry);
778 if (IS_ERR(fid))
779 return PTR_ERR(fid);
780
781 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
782 }
783 ihold(d_inode(old_dentry));
784 d_instantiate(dentry, d_inode(old_dentry));
785
786 return err;
787 }
788
789 /**
790 * v9fs_vfs_mknod_dotl - create a special file
791 * @dir: inode destination for new link
792 * @dentry: dentry for file
793 * @omode: mode for creation
794 * @rdev: device associated with special file
795 *
796 */
797 static int
v9fs_vfs_mknod_dotl(struct inode * dir,struct dentry * dentry,umode_t omode,dev_t rdev)798 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
799 dev_t rdev)
800 {
801 int err;
802 kgid_t gid;
803 const unsigned char *name;
804 umode_t mode;
805 struct v9fs_session_info *v9ses;
806 struct p9_fid *fid = NULL, *dfid = NULL;
807 struct inode *inode;
808 struct p9_qid qid;
809 struct posix_acl *dacl = NULL, *pacl = NULL;
810
811 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
812 dir->i_ino, dentry, omode,
813 MAJOR(rdev), MINOR(rdev));
814
815 v9ses = v9fs_inode2v9ses(dir);
816 dfid = v9fs_parent_fid(dentry);
817 if (IS_ERR(dfid)) {
818 err = PTR_ERR(dfid);
819 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
820 dfid = NULL;
821 goto error;
822 }
823
824 gid = v9fs_get_fsgid_for_create(dir);
825 mode = omode;
826 /* Update mode based on ACL value */
827 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
828 if (err) {
829 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
830 err);
831 goto error;
832 }
833 name = dentry->d_name.name;
834
835 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
836 if (err < 0)
837 goto error;
838
839 v9fs_invalidate_inode_attr(dir);
840 fid = p9_client_walk(dfid, 1, &name, 1);
841 if (IS_ERR(fid)) {
842 err = PTR_ERR(fid);
843 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
844 err);
845 fid = NULL;
846 goto error;
847 }
848
849 /* instantiate inode and assign the unopened fid to the dentry */
850 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
851 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
852 if (IS_ERR(inode)) {
853 err = PTR_ERR(inode);
854 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
855 err);
856 goto error;
857 }
858 v9fs_set_create_acl(inode, fid, dacl, pacl);
859 v9fs_fid_add(dentry, fid);
860 d_instantiate(dentry, inode);
861 fid = NULL;
862 err = 0;
863 } else {
864 /*
865 * Not in cached mode. No need to populate inode with stat.
866 * socket syscall returns a fd, so we need instantiate
867 */
868 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
869 if (IS_ERR(inode)) {
870 err = PTR_ERR(inode);
871 goto error;
872 }
873 v9fs_set_create_acl(inode, fid, dacl, pacl);
874 d_instantiate(dentry, inode);
875 }
876 error:
877 if (fid)
878 p9_client_clunk(fid);
879 v9fs_put_acl(dacl, pacl);
880 return err;
881 }
882
883 /**
884 * v9fs_vfs_get_link_dotl - follow a symlink path
885 * @dentry: dentry for symlink
886 * @inode: inode for symlink
887 * @done: destructor for return value
888 */
889
890 static const char *
v9fs_vfs_get_link_dotl(struct dentry * dentry,struct inode * inode,struct delayed_call * done)891 v9fs_vfs_get_link_dotl(struct dentry *dentry,
892 struct inode *inode,
893 struct delayed_call *done)
894 {
895 struct p9_fid *fid;
896 char *target;
897 int retval;
898
899 if (!dentry)
900 return ERR_PTR(-ECHILD);
901
902 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
903
904 fid = v9fs_fid_lookup(dentry);
905 if (IS_ERR(fid))
906 return ERR_CAST(fid);
907 retval = p9_client_readlink(fid, &target);
908 if (retval)
909 return ERR_PTR(retval);
910 set_delayed_call(done, kfree_link, target);
911 return target;
912 }
913
v9fs_refresh_inode_dotl(struct p9_fid * fid,struct inode * inode)914 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
915 {
916 struct p9_stat_dotl *st;
917 struct v9fs_session_info *v9ses;
918 unsigned int flags;
919
920 v9ses = v9fs_inode2v9ses(inode);
921 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
922 if (IS_ERR(st))
923 return PTR_ERR(st);
924 /*
925 * Don't update inode if the file type is different
926 */
927 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
928 goto out;
929
930 /*
931 * We don't want to refresh inode->i_size,
932 * because we may have cached data
933 */
934 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
935 V9FS_STAT2INODE_KEEP_ISIZE : 0;
936 v9fs_stat2inode_dotl(st, inode, flags);
937 out:
938 kfree(st);
939 return 0;
940 }
941
942 const struct inode_operations v9fs_dir_inode_operations_dotl = {
943 .create = v9fs_vfs_create_dotl,
944 .atomic_open = v9fs_vfs_atomic_open_dotl,
945 .lookup = v9fs_vfs_lookup,
946 .link = v9fs_vfs_link_dotl,
947 .symlink = v9fs_vfs_symlink_dotl,
948 .unlink = v9fs_vfs_unlink,
949 .mkdir = v9fs_vfs_mkdir_dotl,
950 .rmdir = v9fs_vfs_rmdir,
951 .mknod = v9fs_vfs_mknod_dotl,
952 .rename = v9fs_vfs_rename,
953 .getattr = v9fs_vfs_getattr_dotl,
954 .setattr = v9fs_vfs_setattr_dotl,
955 .listxattr = v9fs_listxattr,
956 .get_acl = v9fs_iop_get_acl,
957 };
958
959 const struct inode_operations v9fs_file_inode_operations_dotl = {
960 .getattr = v9fs_vfs_getattr_dotl,
961 .setattr = v9fs_vfs_setattr_dotl,
962 .listxattr = v9fs_listxattr,
963 .get_acl = v9fs_iop_get_acl,
964 };
965
966 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
967 .get_link = v9fs_vfs_get_link_dotl,
968 .getattr = v9fs_vfs_getattr_dotl,
969 .setattr = v9fs_vfs_setattr_dotl,
970 .listxattr = v9fs_listxattr,
971 };
972