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_wrong_type(inode, st->st_mode))
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 = NULL;
544 struct p9_iattr_dotl p9attr = {
545 .uid = INVALID_UID,
546 .gid = INVALID_GID,
547 };
548 struct inode *inode = d_inode(dentry);
549
550 p9_debug(P9_DEBUG_VFS, "\n");
551
552 retval = setattr_prepare(dentry, iattr);
553 if (retval)
554 return retval;
555
556 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
557 if (iattr->ia_valid & ATTR_MODE)
558 p9attr.mode = iattr->ia_mode;
559 if (iattr->ia_valid & ATTR_UID)
560 p9attr.uid = iattr->ia_uid;
561 if (iattr->ia_valid & ATTR_GID)
562 p9attr.gid = iattr->ia_gid;
563 if (iattr->ia_valid & ATTR_SIZE)
564 p9attr.size = iattr->ia_size;
565 if (iattr->ia_valid & ATTR_ATIME_SET) {
566 p9attr.atime_sec = iattr->ia_atime.tv_sec;
567 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
568 }
569 if (iattr->ia_valid & ATTR_MTIME_SET) {
570 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
571 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
572 }
573
574 if (iattr->ia_valid & ATTR_FILE) {
575 fid = iattr->ia_file->private_data;
576 WARN_ON(!fid);
577 }
578 if (!fid)
579 fid = v9fs_fid_lookup(dentry);
580 if (IS_ERR(fid))
581 return PTR_ERR(fid);
582
583 /* Write all dirty data */
584 if (S_ISREG(inode->i_mode))
585 filemap_write_and_wait(inode->i_mapping);
586
587 retval = p9_client_setattr(fid, &p9attr);
588 if (retval < 0)
589 return retval;
590
591 if ((iattr->ia_valid & ATTR_SIZE) &&
592 iattr->ia_size != i_size_read(inode))
593 truncate_setsize(inode, iattr->ia_size);
594
595 v9fs_invalidate_inode_attr(inode);
596 setattr_copy(inode, iattr);
597 mark_inode_dirty(inode);
598 if (iattr->ia_valid & ATTR_MODE) {
599 /* We also want to update ACL when we update mode bits */
600 retval = v9fs_acl_chmod(inode, fid);
601 if (retval < 0)
602 return retval;
603 }
604 return 0;
605 }
606
607 /**
608 * v9fs_stat2inode_dotl - populate an inode structure with stat info
609 * @stat: stat structure
610 * @inode: inode to populate
611 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
612 *
613 */
614
615 void
v9fs_stat2inode_dotl(struct p9_stat_dotl * stat,struct inode * inode,unsigned int flags)616 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
617 unsigned int flags)
618 {
619 umode_t mode;
620 struct v9fs_inode *v9inode = V9FS_I(inode);
621
622 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
623 inode->i_atime.tv_sec = stat->st_atime_sec;
624 inode->i_atime.tv_nsec = stat->st_atime_nsec;
625 inode->i_mtime.tv_sec = stat->st_mtime_sec;
626 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
627 inode->i_ctime.tv_sec = stat->st_ctime_sec;
628 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
629 inode->i_uid = stat->st_uid;
630 inode->i_gid = stat->st_gid;
631 set_nlink(inode, stat->st_nlink);
632
633 mode = stat->st_mode & S_IALLUGO;
634 mode |= inode->i_mode & ~S_IALLUGO;
635 inode->i_mode = mode;
636
637 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
638 v9fs_i_size_write(inode, stat->st_size);
639 inode->i_blocks = stat->st_blocks;
640 } else {
641 if (stat->st_result_mask & P9_STATS_ATIME) {
642 inode->i_atime.tv_sec = stat->st_atime_sec;
643 inode->i_atime.tv_nsec = stat->st_atime_nsec;
644 }
645 if (stat->st_result_mask & P9_STATS_MTIME) {
646 inode->i_mtime.tv_sec = stat->st_mtime_sec;
647 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
648 }
649 if (stat->st_result_mask & P9_STATS_CTIME) {
650 inode->i_ctime.tv_sec = stat->st_ctime_sec;
651 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
652 }
653 if (stat->st_result_mask & P9_STATS_UID)
654 inode->i_uid = stat->st_uid;
655 if (stat->st_result_mask & P9_STATS_GID)
656 inode->i_gid = stat->st_gid;
657 if (stat->st_result_mask & P9_STATS_NLINK)
658 set_nlink(inode, stat->st_nlink);
659 if (stat->st_result_mask & P9_STATS_MODE) {
660 mode = stat->st_mode & S_IALLUGO;
661 mode |= inode->i_mode & ~S_IALLUGO;
662 inode->i_mode = mode;
663 }
664 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
665 stat->st_result_mask & P9_STATS_SIZE)
666 v9fs_i_size_write(inode, stat->st_size);
667 if (stat->st_result_mask & P9_STATS_BLOCKS)
668 inode->i_blocks = stat->st_blocks;
669 }
670 if (stat->st_result_mask & P9_STATS_GEN)
671 inode->i_generation = stat->st_gen;
672
673 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
674 * because the inode structure does not have fields for them.
675 */
676 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
677 }
678
679 static int
v9fs_vfs_symlink_dotl(struct inode * dir,struct dentry * dentry,const char * symname)680 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
681 const char *symname)
682 {
683 int err;
684 kgid_t gid;
685 const unsigned char *name;
686 struct p9_qid qid;
687 struct inode *inode;
688 struct p9_fid *dfid;
689 struct p9_fid *fid = NULL;
690 struct v9fs_session_info *v9ses;
691
692 name = dentry->d_name.name;
693 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
694 v9ses = v9fs_inode2v9ses(dir);
695
696 dfid = v9fs_parent_fid(dentry);
697 if (IS_ERR(dfid)) {
698 err = PTR_ERR(dfid);
699 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
700 return err;
701 }
702
703 gid = v9fs_get_fsgid_for_create(dir);
704
705 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
706 err = p9_client_symlink(dfid, name, symname, gid, &qid);
707
708 if (err < 0) {
709 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
710 goto error;
711 }
712
713 v9fs_invalidate_inode_attr(dir);
714 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
715 /* Now walk from the parent so we can get an unopened fid. */
716 fid = p9_client_walk(dfid, 1, &name, 1);
717 if (IS_ERR(fid)) {
718 err = PTR_ERR(fid);
719 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
720 err);
721 fid = NULL;
722 goto error;
723 }
724
725 /* instantiate inode and assign the unopened fid to dentry */
726 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
727 if (IS_ERR(inode)) {
728 err = PTR_ERR(inode);
729 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
730 err);
731 goto error;
732 }
733 v9fs_fid_add(dentry, fid);
734 d_instantiate(dentry, inode);
735 fid = NULL;
736 err = 0;
737 } else {
738 /* Not in cached mode. No need to populate inode with stat */
739 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
740 if (IS_ERR(inode)) {
741 err = PTR_ERR(inode);
742 goto error;
743 }
744 d_instantiate(dentry, inode);
745 }
746
747 error:
748 if (fid)
749 p9_client_clunk(fid);
750
751 return err;
752 }
753
754 /**
755 * v9fs_vfs_link_dotl - create a hardlink for dotl
756 * @old_dentry: dentry for file to link to
757 * @dir: inode destination for new link
758 * @dentry: dentry for link
759 *
760 */
761
762 static int
v9fs_vfs_link_dotl(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)763 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
764 struct dentry *dentry)
765 {
766 int err;
767 struct p9_fid *dfid, *oldfid;
768 struct v9fs_session_info *v9ses;
769
770 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
771 dir->i_ino, old_dentry, dentry);
772
773 v9ses = v9fs_inode2v9ses(dir);
774 dfid = v9fs_parent_fid(dentry);
775 if (IS_ERR(dfid))
776 return PTR_ERR(dfid);
777
778 oldfid = v9fs_fid_lookup(old_dentry);
779 if (IS_ERR(oldfid))
780 return PTR_ERR(oldfid);
781
782 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
783
784 if (err < 0) {
785 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
786 return err;
787 }
788
789 v9fs_invalidate_inode_attr(dir);
790 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
791 /* Get the latest stat info from server. */
792 struct p9_fid *fid;
793 fid = v9fs_fid_lookup(old_dentry);
794 if (IS_ERR(fid))
795 return PTR_ERR(fid);
796
797 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
798 }
799 ihold(d_inode(old_dentry));
800 d_instantiate(dentry, d_inode(old_dentry));
801
802 return err;
803 }
804
805 /**
806 * v9fs_vfs_mknod_dotl - create a special file
807 * @dir: inode destination for new link
808 * @dentry: dentry for file
809 * @omode: mode for creation
810 * @rdev: device associated with special file
811 *
812 */
813 static int
v9fs_vfs_mknod_dotl(struct inode * dir,struct dentry * dentry,umode_t omode,dev_t rdev)814 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
815 dev_t rdev)
816 {
817 int err;
818 kgid_t gid;
819 const unsigned char *name;
820 umode_t mode;
821 struct v9fs_session_info *v9ses;
822 struct p9_fid *fid = NULL, *dfid = NULL;
823 struct inode *inode;
824 struct p9_qid qid;
825 struct posix_acl *dacl = NULL, *pacl = NULL;
826
827 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
828 dir->i_ino, dentry, omode,
829 MAJOR(rdev), MINOR(rdev));
830
831 v9ses = v9fs_inode2v9ses(dir);
832 dfid = v9fs_parent_fid(dentry);
833 if (IS_ERR(dfid)) {
834 err = PTR_ERR(dfid);
835 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
836 dfid = NULL;
837 goto error;
838 }
839
840 gid = v9fs_get_fsgid_for_create(dir);
841 mode = omode;
842 /* Update mode based on ACL value */
843 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
844 if (err) {
845 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
846 err);
847 goto error;
848 }
849 name = dentry->d_name.name;
850
851 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
852 if (err < 0)
853 goto error;
854
855 v9fs_invalidate_inode_attr(dir);
856 fid = p9_client_walk(dfid, 1, &name, 1);
857 if (IS_ERR(fid)) {
858 err = PTR_ERR(fid);
859 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
860 err);
861 fid = NULL;
862 goto error;
863 }
864
865 /* instantiate inode and assign the unopened fid to the dentry */
866 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
867 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
868 if (IS_ERR(inode)) {
869 err = PTR_ERR(inode);
870 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
871 err);
872 goto error;
873 }
874 v9fs_set_create_acl(inode, fid, dacl, pacl);
875 v9fs_fid_add(dentry, fid);
876 d_instantiate(dentry, inode);
877 fid = NULL;
878 err = 0;
879 } else {
880 /*
881 * Not in cached mode. No need to populate inode with stat.
882 * socket syscall returns a fd, so we need instantiate
883 */
884 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
885 if (IS_ERR(inode)) {
886 err = PTR_ERR(inode);
887 goto error;
888 }
889 v9fs_set_create_acl(inode, fid, dacl, pacl);
890 d_instantiate(dentry, inode);
891 }
892 error:
893 if (fid)
894 p9_client_clunk(fid);
895 v9fs_put_acl(dacl, pacl);
896 return err;
897 }
898
899 /**
900 * v9fs_vfs_get_link_dotl - follow a symlink path
901 * @dentry: dentry for symlink
902 * @inode: inode for symlink
903 * @done: destructor for return value
904 */
905
906 static const char *
v9fs_vfs_get_link_dotl(struct dentry * dentry,struct inode * inode,struct delayed_call * done)907 v9fs_vfs_get_link_dotl(struct dentry *dentry,
908 struct inode *inode,
909 struct delayed_call *done)
910 {
911 struct p9_fid *fid;
912 char *target;
913 int retval;
914
915 if (!dentry)
916 return ERR_PTR(-ECHILD);
917
918 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
919
920 fid = v9fs_fid_lookup(dentry);
921 if (IS_ERR(fid))
922 return ERR_CAST(fid);
923 retval = p9_client_readlink(fid, &target);
924 if (retval)
925 return ERR_PTR(retval);
926 set_delayed_call(done, kfree_link, target);
927 return target;
928 }
929
v9fs_refresh_inode_dotl(struct p9_fid * fid,struct inode * inode)930 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
931 {
932 struct p9_stat_dotl *st;
933 struct v9fs_session_info *v9ses;
934 unsigned int flags;
935
936 v9ses = v9fs_inode2v9ses(inode);
937 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
938 if (IS_ERR(st))
939 return PTR_ERR(st);
940 /*
941 * Don't update inode if the file type is different
942 */
943 if (inode_wrong_type(inode, st->st_mode))
944 goto out;
945
946 /*
947 * We don't want to refresh inode->i_size,
948 * because we may have cached data
949 */
950 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
951 V9FS_STAT2INODE_KEEP_ISIZE : 0;
952 v9fs_stat2inode_dotl(st, inode, flags);
953 out:
954 kfree(st);
955 return 0;
956 }
957
958 const struct inode_operations v9fs_dir_inode_operations_dotl = {
959 .create = v9fs_vfs_create_dotl,
960 .atomic_open = v9fs_vfs_atomic_open_dotl,
961 .lookup = v9fs_vfs_lookup,
962 .link = v9fs_vfs_link_dotl,
963 .symlink = v9fs_vfs_symlink_dotl,
964 .unlink = v9fs_vfs_unlink,
965 .mkdir = v9fs_vfs_mkdir_dotl,
966 .rmdir = v9fs_vfs_rmdir,
967 .mknod = v9fs_vfs_mknod_dotl,
968 .rename = v9fs_vfs_rename,
969 .getattr = v9fs_vfs_getattr_dotl,
970 .setattr = v9fs_vfs_setattr_dotl,
971 .listxattr = v9fs_listxattr,
972 .get_acl = v9fs_iop_get_acl,
973 };
974
975 const struct inode_operations v9fs_file_inode_operations_dotl = {
976 .getattr = v9fs_vfs_getattr_dotl,
977 .setattr = v9fs_vfs_setattr_dotl,
978 .listxattr = v9fs_listxattr,
979 .get_acl = v9fs_iop_get_acl,
980 };
981
982 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
983 .get_link = v9fs_vfs_get_link_dotl,
984 .getattr = v9fs_vfs_getattr_dotl,
985 .setattr = v9fs_vfs_setattr_dotl,
986 .listxattr = v9fs_listxattr,
987 };
988