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
v9fs_get_fsgid_for_create(struct inode * dir_inode)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
56
57 struct inode *
v9fs_fid_iget_dotl(struct super_block * sb,struct p9_fid * fid,bool new)58 v9fs_fid_iget_dotl(struct super_block *sb, struct p9_fid *fid, bool new)
59 {
60 int retval;
61 struct inode *inode;
62 struct p9_stat_dotl *st;
63 struct v9fs_session_info *v9ses = sb->s_fs_info;
64
65 inode = iget_locked(sb, QID2INO(&fid->qid));
66 if (unlikely(!inode))
67 return ERR_PTR(-ENOMEM);
68 if (!(inode->i_state & I_NEW)) {
69 if (!new) {
70 goto done;
71 } else { /* deal with race condition in inode number reuse */
72 p9_debug(P9_DEBUG_ERROR, "WARNING: Inode collision %lx\n",
73 inode->i_ino);
74 iput(inode);
75 remove_inode_hash(inode);
76 inode = iget_locked(sb, QID2INO(&fid->qid));
77 WARN_ON(!(inode->i_state & I_NEW));
78 }
79 }
80
81 /*
82 * initialize the inode with the stat info
83 * FIXME!! we may need support for stale inodes
84 * later.
85 */
86 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
87 if (IS_ERR(st)) {
88 retval = PTR_ERR(st);
89 goto error;
90 }
91
92 retval = v9fs_init_inode(v9ses, inode, &fid->qid,
93 st->st_mode, new_decode_dev(st->st_rdev));
94 v9fs_stat2inode_dotl(st, inode, 0);
95 kfree(st);
96 if (retval)
97 goto error;
98
99 v9fs_set_netfs_context(inode);
100 v9fs_cache_inode_get_cookie(inode);
101 retval = v9fs_get_acl(inode, fid);
102 if (retval)
103 goto error;
104
105 unlock_new_inode(inode);
106 done:
107 return inode;
108 error:
109 iget_failed(inode);
110 return ERR_PTR(retval);
111 }
112
113 struct dotl_openflag_map {
114 int open_flag;
115 int dotl_flag;
116 };
117
v9fs_mapped_dotl_flags(int flags)118 static int v9fs_mapped_dotl_flags(int flags)
119 {
120 int i;
121 int rflags = 0;
122 struct dotl_openflag_map dotl_oflag_map[] = {
123 { O_CREAT, P9_DOTL_CREATE },
124 { O_EXCL, P9_DOTL_EXCL },
125 { O_NOCTTY, P9_DOTL_NOCTTY },
126 { O_APPEND, P9_DOTL_APPEND },
127 { O_NONBLOCK, P9_DOTL_NONBLOCK },
128 { O_DSYNC, P9_DOTL_DSYNC },
129 { FASYNC, P9_DOTL_FASYNC },
130 { O_DIRECT, P9_DOTL_DIRECT },
131 { O_LARGEFILE, P9_DOTL_LARGEFILE },
132 { O_DIRECTORY, P9_DOTL_DIRECTORY },
133 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
134 { O_NOATIME, P9_DOTL_NOATIME },
135 { O_CLOEXEC, P9_DOTL_CLOEXEC },
136 { O_SYNC, P9_DOTL_SYNC},
137 };
138 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
139 if (flags & dotl_oflag_map[i].open_flag)
140 rflags |= dotl_oflag_map[i].dotl_flag;
141 }
142 return rflags;
143 }
144
145 /**
146 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
147 * plan 9 open flag.
148 * @flags: flags to convert
149 */
v9fs_open_to_dotl_flags(int flags)150 int v9fs_open_to_dotl_flags(int flags)
151 {
152 int rflags = 0;
153
154 /*
155 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
156 * and P9_DOTL_NOACCESS
157 */
158 rflags |= flags & O_ACCMODE;
159 rflags |= v9fs_mapped_dotl_flags(flags);
160
161 return rflags;
162 }
163
164 /**
165 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
166 * @idmap: The user namespace of the mount
167 * @dir: directory inode that is being created
168 * @dentry: dentry that is being deleted
169 * @omode: create permissions
170 * @excl: True if the file must not yet exist
171 *
172 */
173 static int
v9fs_vfs_create_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t omode,bool excl)174 v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir,
175 struct dentry *dentry, umode_t omode, bool excl)
176 {
177 return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0);
178 }
179
180 static int
v9fs_vfs_atomic_open_dotl(struct inode * dir,struct dentry * dentry,struct file * file,unsigned int flags,umode_t omode)181 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
182 struct file *file, unsigned int flags, umode_t omode)
183 {
184 int err = 0;
185 kgid_t gid;
186 umode_t mode;
187 int p9_omode = v9fs_open_to_dotl_flags(flags);
188 const unsigned char *name = NULL;
189 struct p9_qid qid;
190 struct inode *inode;
191 struct p9_fid *fid = NULL;
192 struct p9_fid *dfid = NULL, *ofid = NULL;
193 struct v9fs_session_info *v9ses;
194 struct posix_acl *pacl = NULL, *dacl = NULL;
195 struct dentry *res = NULL;
196
197 if (d_in_lookup(dentry)) {
198 res = v9fs_vfs_lookup(dir, dentry, 0);
199 if (IS_ERR(res))
200 return PTR_ERR(res);
201
202 if (res)
203 dentry = res;
204 }
205
206 /* Only creates */
207 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
208 return finish_no_open(file, res);
209
210 v9ses = v9fs_inode2v9ses(dir);
211
212 name = dentry->d_name.name;
213 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
214 name, flags, omode);
215
216 dfid = v9fs_parent_fid(dentry);
217 if (IS_ERR(dfid)) {
218 err = PTR_ERR(dfid);
219 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
220 goto out;
221 }
222
223 /* clone a fid to use for creation */
224 ofid = clone_fid(dfid);
225 if (IS_ERR(ofid)) {
226 err = PTR_ERR(ofid);
227 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
228 goto out;
229 }
230
231 gid = v9fs_get_fsgid_for_create(dir);
232
233 mode = omode;
234 /* Update mode based on ACL value */
235 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
236 if (err) {
237 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n",
238 err);
239 goto out;
240 }
241
242 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
243 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
244 p9_debug(P9_DEBUG_CACHE,
245 "write-only file with writeback enabled, creating w/ O_RDWR\n");
246 }
247 err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid);
248 if (err < 0) {
249 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n",
250 err);
251 goto out;
252 }
253 v9fs_invalidate_inode_attr(dir);
254
255 /* instantiate inode and assign the unopened fid to the dentry */
256 fid = p9_client_walk(dfid, 1, &name, 1);
257 if (IS_ERR(fid)) {
258 err = PTR_ERR(fid);
259 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
260 goto out;
261 }
262 inode = v9fs_fid_iget_dotl(dir->i_sb, fid, true);
263 if (IS_ERR(inode)) {
264 err = PTR_ERR(inode);
265 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
266 goto out;
267 }
268 /* Now set the ACL based on the default value */
269 v9fs_set_create_acl(inode, fid, dacl, pacl);
270
271 v9fs_fid_add(dentry, &fid);
272 d_instantiate(dentry, inode);
273
274 /* Since we are opening a file, assign the open fid to the file */
275 err = finish_open(file, dentry, generic_file_open);
276 if (err)
277 goto out;
278 file->private_data = ofid;
279 #ifdef CONFIG_9P_FSCACHE
280 if (v9ses->cache & CACHE_FSCACHE) {
281 struct v9fs_inode *v9inode = V9FS_I(inode);
282 fscache_use_cookie(v9fs_inode_cookie(v9inode),
283 file->f_mode & FMODE_WRITE);
284 }
285 #endif
286 v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags);
287 v9fs_open_fid_add(inode, &ofid);
288 file->f_mode |= FMODE_CREATED;
289 out:
290 p9_fid_put(dfid);
291 p9_fid_put(ofid);
292 p9_fid_put(fid);
293 v9fs_put_acl(dacl, pacl);
294 dput(res);
295 return err;
296 }
297
298 /**
299 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
300 * @idmap: The idmap of the mount
301 * @dir: inode that is being unlinked
302 * @dentry: dentry that is being unlinked
303 * @omode: mode for new directory
304 *
305 */
306
v9fs_vfs_mkdir_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t omode)307 static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
308 struct inode *dir, struct dentry *dentry,
309 umode_t omode)
310 {
311 int err;
312 struct p9_fid *fid = NULL, *dfid = NULL;
313 kgid_t gid;
314 const unsigned char *name;
315 umode_t mode;
316 struct inode *inode;
317 struct p9_qid qid;
318 struct posix_acl *dacl = NULL, *pacl = NULL;
319
320 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
321
322 omode |= S_IFDIR;
323 if (dir->i_mode & S_ISGID)
324 omode |= S_ISGID;
325
326 dfid = v9fs_parent_fid(dentry);
327 if (IS_ERR(dfid)) {
328 err = PTR_ERR(dfid);
329 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
330 goto error;
331 }
332
333 gid = v9fs_get_fsgid_for_create(dir);
334 mode = omode;
335 /* Update mode based on ACL value */
336 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
337 if (err) {
338 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
339 err);
340 goto error;
341 }
342 name = dentry->d_name.name;
343 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
344 if (err < 0)
345 goto error;
346 fid = p9_client_walk(dfid, 1, &name, 1);
347 if (IS_ERR(fid)) {
348 err = PTR_ERR(fid);
349 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
350 err);
351 goto error;
352 }
353
354 /* instantiate inode and assign the unopened fid to the dentry */
355 inode = v9fs_fid_iget_dotl(dir->i_sb, fid, true);
356 if (IS_ERR(inode)) {
357 err = PTR_ERR(inode);
358 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
359 err);
360 goto error;
361 }
362 v9fs_fid_add(dentry, &fid);
363 v9fs_set_create_acl(inode, fid, dacl, pacl);
364 d_instantiate(dentry, inode);
365 err = 0;
366 inc_nlink(dir);
367 v9fs_invalidate_inode_attr(dir);
368 error:
369 p9_fid_put(fid);
370 v9fs_put_acl(dacl, pacl);
371 p9_fid_put(dfid);
372 return err;
373 }
374
375 static int
v9fs_vfs_getattr_dotl(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)376 v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap,
377 const struct path *path, struct kstat *stat,
378 u32 request_mask, unsigned int flags)
379 {
380 struct dentry *dentry = path->dentry;
381 struct v9fs_session_info *v9ses;
382 struct p9_fid *fid;
383 struct inode *inode = d_inode(dentry);
384 struct p9_stat_dotl *st;
385
386 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
387 v9ses = v9fs_dentry2v9ses(dentry);
388 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
389 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
390 return 0;
391 } else if (v9ses->cache) {
392 if (S_ISREG(inode->i_mode)) {
393 int retval = filemap_fdatawrite(inode->i_mapping);
394
395 if (retval)
396 p9_debug(P9_DEBUG_ERROR,
397 "flushing writeback during getattr returned %d\n", retval);
398 }
399 }
400 fid = v9fs_fid_lookup(dentry);
401 if (IS_ERR(fid))
402 return PTR_ERR(fid);
403
404 /* Ask for all the fields in stat structure. Server will return
405 * whatever it supports
406 */
407
408 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
409 p9_fid_put(fid);
410 if (IS_ERR(st))
411 return PTR_ERR(st);
412
413 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
414 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
415 /* Change block size to what the server returned */
416 stat->blksize = st->st_blksize;
417
418 kfree(st);
419 return 0;
420 }
421
422 /*
423 * Attribute flags.
424 */
425 #define P9_ATTR_MODE (1 << 0)
426 #define P9_ATTR_UID (1 << 1)
427 #define P9_ATTR_GID (1 << 2)
428 #define P9_ATTR_SIZE (1 << 3)
429 #define P9_ATTR_ATIME (1 << 4)
430 #define P9_ATTR_MTIME (1 << 5)
431 #define P9_ATTR_CTIME (1 << 6)
432 #define P9_ATTR_ATIME_SET (1 << 7)
433 #define P9_ATTR_MTIME_SET (1 << 8)
434
435 struct dotl_iattr_map {
436 int iattr_valid;
437 int p9_iattr_valid;
438 };
439
v9fs_mapped_iattr_valid(int iattr_valid)440 static int v9fs_mapped_iattr_valid(int iattr_valid)
441 {
442 int i;
443 int p9_iattr_valid = 0;
444 struct dotl_iattr_map dotl_iattr_map[] = {
445 { ATTR_MODE, P9_ATTR_MODE },
446 { ATTR_UID, P9_ATTR_UID },
447 { ATTR_GID, P9_ATTR_GID },
448 { ATTR_SIZE, P9_ATTR_SIZE },
449 { ATTR_ATIME, P9_ATTR_ATIME },
450 { ATTR_MTIME, P9_ATTR_MTIME },
451 { ATTR_CTIME, P9_ATTR_CTIME },
452 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
453 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
454 };
455 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
456 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
457 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
458 }
459 return p9_iattr_valid;
460 }
461
462 /**
463 * v9fs_vfs_setattr_dotl - set file metadata
464 * @idmap: idmap of the mount
465 * @dentry: file whose metadata to set
466 * @iattr: metadata assignment structure
467 *
468 */
469
v9fs_vfs_setattr_dotl(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * iattr)470 int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
471 struct dentry *dentry, struct iattr *iattr)
472 {
473 int retval, use_dentry = 0;
474 struct inode *inode = d_inode(dentry);
475 struct v9fs_session_info __maybe_unused *v9ses;
476 struct p9_fid *fid = NULL;
477 struct p9_iattr_dotl p9attr = {
478 .uid = INVALID_UID,
479 .gid = INVALID_GID,
480 };
481
482 p9_debug(P9_DEBUG_VFS, "\n");
483
484 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
485 if (retval)
486 return retval;
487
488 v9ses = v9fs_dentry2v9ses(dentry);
489
490 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
491 if (iattr->ia_valid & ATTR_MODE)
492 p9attr.mode = iattr->ia_mode;
493 if (iattr->ia_valid & ATTR_UID)
494 p9attr.uid = iattr->ia_uid;
495 if (iattr->ia_valid & ATTR_GID)
496 p9attr.gid = iattr->ia_gid;
497 if (iattr->ia_valid & ATTR_SIZE)
498 p9attr.size = iattr->ia_size;
499 if (iattr->ia_valid & ATTR_ATIME_SET) {
500 p9attr.atime_sec = iattr->ia_atime.tv_sec;
501 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
502 }
503 if (iattr->ia_valid & ATTR_MTIME_SET) {
504 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
505 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
506 }
507
508 if (iattr->ia_valid & ATTR_FILE) {
509 fid = iattr->ia_file->private_data;
510 WARN_ON(!fid);
511 }
512 if (!fid) {
513 fid = v9fs_fid_lookup(dentry);
514 use_dentry = 1;
515 }
516 if (IS_ERR(fid))
517 return PTR_ERR(fid);
518
519 /* Write all dirty data */
520 if (S_ISREG(inode->i_mode)) {
521 retval = filemap_fdatawrite(inode->i_mapping);
522 if (retval < 0)
523 p9_debug(P9_DEBUG_ERROR,
524 "Flushing file prior to setattr failed: %d\n", retval);
525 }
526
527 retval = p9_client_setattr(fid, &p9attr);
528 if (retval < 0) {
529 if (use_dentry)
530 p9_fid_put(fid);
531 return retval;
532 }
533
534 if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size !=
535 i_size_read(inode)) {
536 truncate_setsize(inode, iattr->ia_size);
537 netfs_resize_file(netfs_inode(inode), iattr->ia_size, true);
538
539 #ifdef CONFIG_9P_FSCACHE
540 if (v9ses->cache & CACHE_FSCACHE)
541 fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)),
542 iattr->ia_size);
543 #endif
544 }
545
546 v9fs_invalidate_inode_attr(inode);
547 setattr_copy(&nop_mnt_idmap, inode, iattr);
548 mark_inode_dirty(inode);
549 if (iattr->ia_valid & ATTR_MODE) {
550 /* We also want to update ACL when we update mode bits */
551 retval = v9fs_acl_chmod(inode, fid);
552 if (retval < 0) {
553 if (use_dentry)
554 p9_fid_put(fid);
555 return retval;
556 }
557 }
558 if (use_dentry)
559 p9_fid_put(fid);
560
561 return 0;
562 }
563
564 /**
565 * v9fs_stat2inode_dotl - populate an inode structure with stat info
566 * @stat: stat structure
567 * @inode: inode to populate
568 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
569 *
570 */
571
572 void
v9fs_stat2inode_dotl(struct p9_stat_dotl * stat,struct inode * inode,unsigned int flags)573 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
574 unsigned int flags)
575 {
576 umode_t mode;
577 struct v9fs_inode *v9inode = V9FS_I(inode);
578
579 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
580 inode_set_atime(inode, stat->st_atime_sec,
581 stat->st_atime_nsec);
582 inode_set_mtime(inode, stat->st_mtime_sec,
583 stat->st_mtime_nsec);
584 inode_set_ctime(inode, stat->st_ctime_sec,
585 stat->st_ctime_nsec);
586 inode->i_uid = stat->st_uid;
587 inode->i_gid = stat->st_gid;
588 set_nlink(inode, stat->st_nlink);
589
590 mode = stat->st_mode & S_IALLUGO;
591 mode |= inode->i_mode & ~S_IALLUGO;
592 inode->i_mode = mode;
593
594 v9inode->netfs.remote_i_size = stat->st_size;
595 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
596 v9fs_i_size_write(inode, stat->st_size);
597 inode->i_blocks = stat->st_blocks;
598 } else {
599 if (stat->st_result_mask & P9_STATS_ATIME) {
600 inode_set_atime(inode, stat->st_atime_sec,
601 stat->st_atime_nsec);
602 }
603 if (stat->st_result_mask & P9_STATS_MTIME) {
604 inode_set_mtime(inode, stat->st_mtime_sec,
605 stat->st_mtime_nsec);
606 }
607 if (stat->st_result_mask & P9_STATS_CTIME) {
608 inode_set_ctime(inode, stat->st_ctime_sec,
609 stat->st_ctime_nsec);
610 }
611 if (stat->st_result_mask & P9_STATS_UID)
612 inode->i_uid = stat->st_uid;
613 if (stat->st_result_mask & P9_STATS_GID)
614 inode->i_gid = stat->st_gid;
615 if (stat->st_result_mask & P9_STATS_NLINK)
616 set_nlink(inode, stat->st_nlink);
617 if (stat->st_result_mask & P9_STATS_MODE) {
618 mode = stat->st_mode & S_IALLUGO;
619 mode |= inode->i_mode & ~S_IALLUGO;
620 inode->i_mode = mode;
621 }
622 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
623 stat->st_result_mask & P9_STATS_SIZE) {
624 v9inode->netfs.remote_i_size = stat->st_size;
625 v9fs_i_size_write(inode, stat->st_size);
626 }
627 if (stat->st_result_mask & P9_STATS_BLOCKS)
628 inode->i_blocks = stat->st_blocks;
629 }
630 if (stat->st_result_mask & P9_STATS_GEN)
631 inode->i_generation = stat->st_gen;
632
633 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
634 * because the inode structure does not have fields for them.
635 */
636 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
637 }
638
639 static int
v9fs_vfs_symlink_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,const char * symname)640 v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir,
641 struct dentry *dentry, const char *symname)
642 {
643 int err;
644 kgid_t gid;
645 const unsigned char *name;
646 struct p9_qid qid;
647 struct p9_fid *dfid;
648 struct p9_fid *fid = NULL;
649
650 name = dentry->d_name.name;
651 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
652
653 dfid = v9fs_parent_fid(dentry);
654 if (IS_ERR(dfid)) {
655 err = PTR_ERR(dfid);
656 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
657 return err;
658 }
659
660 gid = v9fs_get_fsgid_for_create(dir);
661
662 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
663 err = p9_client_symlink(dfid, name, symname, gid, &qid);
664
665 if (err < 0) {
666 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
667 goto error;
668 }
669
670 v9fs_invalidate_inode_attr(dir);
671
672 error:
673 p9_fid_put(fid);
674 p9_fid_put(dfid);
675 return err;
676 }
677
678 /**
679 * v9fs_vfs_link_dotl - create a hardlink for dotl
680 * @old_dentry: dentry for file to link to
681 * @dir: inode destination for new link
682 * @dentry: dentry for link
683 *
684 */
685
686 static int
v9fs_vfs_link_dotl(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)687 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
688 struct dentry *dentry)
689 {
690 int err;
691 struct p9_fid *dfid, *oldfid;
692 struct v9fs_session_info *v9ses;
693
694 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
695 dir->i_ino, old_dentry, dentry);
696
697 v9ses = v9fs_inode2v9ses(dir);
698 dfid = v9fs_parent_fid(dentry);
699 if (IS_ERR(dfid))
700 return PTR_ERR(dfid);
701
702 oldfid = v9fs_fid_lookup(old_dentry);
703 if (IS_ERR(oldfid)) {
704 p9_fid_put(dfid);
705 return PTR_ERR(oldfid);
706 }
707
708 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
709
710 p9_fid_put(dfid);
711 p9_fid_put(oldfid);
712 if (err < 0) {
713 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
714 return err;
715 }
716
717 v9fs_invalidate_inode_attr(dir);
718 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
719 /* Get the latest stat info from server. */
720 struct p9_fid *fid;
721
722 fid = v9fs_fid_lookup(old_dentry);
723 if (IS_ERR(fid))
724 return PTR_ERR(fid);
725
726 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
727 p9_fid_put(fid);
728 }
729 ihold(d_inode(old_dentry));
730 d_instantiate(dentry, d_inode(old_dentry));
731
732 return err;
733 }
734
735 /**
736 * v9fs_vfs_mknod_dotl - create a special file
737 * @idmap: The idmap of the mount
738 * @dir: inode destination for new link
739 * @dentry: dentry for file
740 * @omode: mode for creation
741 * @rdev: device associated with special file
742 *
743 */
744 static int
v9fs_vfs_mknod_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t omode,dev_t rdev)745 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
746 struct dentry *dentry, umode_t omode, dev_t rdev)
747 {
748 int err;
749 kgid_t gid;
750 const unsigned char *name;
751 umode_t mode;
752 struct p9_fid *fid = NULL, *dfid = NULL;
753 struct inode *inode;
754 struct p9_qid qid;
755 struct posix_acl *dacl = NULL, *pacl = NULL;
756
757 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
758 dir->i_ino, dentry, omode,
759 MAJOR(rdev), MINOR(rdev));
760
761 dfid = v9fs_parent_fid(dentry);
762 if (IS_ERR(dfid)) {
763 err = PTR_ERR(dfid);
764 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
765 goto error;
766 }
767
768 gid = v9fs_get_fsgid_for_create(dir);
769 mode = omode;
770 /* Update mode based on ACL value */
771 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
772 if (err) {
773 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
774 err);
775 goto error;
776 }
777 name = dentry->d_name.name;
778
779 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
780 if (err < 0)
781 goto error;
782
783 v9fs_invalidate_inode_attr(dir);
784 fid = p9_client_walk(dfid, 1, &name, 1);
785 if (IS_ERR(fid)) {
786 err = PTR_ERR(fid);
787 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
788 err);
789 goto error;
790 }
791 inode = v9fs_fid_iget_dotl(dir->i_sb, fid, true);
792 if (IS_ERR(inode)) {
793 err = PTR_ERR(inode);
794 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
795 err);
796 goto error;
797 }
798 v9fs_set_create_acl(inode, fid, dacl, pacl);
799 v9fs_fid_add(dentry, &fid);
800 d_instantiate(dentry, inode);
801 err = 0;
802 error:
803 p9_fid_put(fid);
804 v9fs_put_acl(dacl, pacl);
805 p9_fid_put(dfid);
806
807 return err;
808 }
809
810 /**
811 * v9fs_vfs_get_link_dotl - follow a symlink path
812 * @dentry: dentry for symlink
813 * @inode: inode for symlink
814 * @done: destructor for return value
815 */
816
817 static const char *
v9fs_vfs_get_link_dotl(struct dentry * dentry,struct inode * inode,struct delayed_call * done)818 v9fs_vfs_get_link_dotl(struct dentry *dentry,
819 struct inode *inode,
820 struct delayed_call *done)
821 {
822 struct p9_fid *fid;
823 char *target;
824 int retval;
825
826 if (!dentry)
827 return ERR_PTR(-ECHILD);
828
829 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
830
831 fid = v9fs_fid_lookup(dentry);
832 if (IS_ERR(fid))
833 return ERR_CAST(fid);
834 retval = p9_client_readlink(fid, &target);
835 p9_fid_put(fid);
836 if (retval)
837 return ERR_PTR(retval);
838 set_delayed_call(done, kfree_link, target);
839 return target;
840 }
841
v9fs_refresh_inode_dotl(struct p9_fid * fid,struct inode * inode)842 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
843 {
844 struct p9_stat_dotl *st;
845 struct v9fs_session_info *v9ses;
846 unsigned int flags;
847
848 v9ses = v9fs_inode2v9ses(inode);
849 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
850 if (IS_ERR(st))
851 return PTR_ERR(st);
852 /*
853 * Don't update inode if the file type is different
854 */
855 if (inode_wrong_type(inode, st->st_mode))
856 goto out;
857
858 /*
859 * We don't want to refresh inode->i_size,
860 * because we may have cached data
861 */
862 flags = (v9ses->cache & CACHE_LOOSE) ?
863 V9FS_STAT2INODE_KEEP_ISIZE : 0;
864 v9fs_stat2inode_dotl(st, inode, flags);
865 out:
866 kfree(st);
867 return 0;
868 }
869
870 const struct inode_operations v9fs_dir_inode_operations_dotl = {
871 .create = v9fs_vfs_create_dotl,
872 .atomic_open = v9fs_vfs_atomic_open_dotl,
873 .lookup = v9fs_vfs_lookup,
874 .link = v9fs_vfs_link_dotl,
875 .symlink = v9fs_vfs_symlink_dotl,
876 .unlink = v9fs_vfs_unlink,
877 .mkdir = v9fs_vfs_mkdir_dotl,
878 .rmdir = v9fs_vfs_rmdir,
879 .mknod = v9fs_vfs_mknod_dotl,
880 .rename = v9fs_vfs_rename,
881 .getattr = v9fs_vfs_getattr_dotl,
882 .setattr = v9fs_vfs_setattr_dotl,
883 .listxattr = v9fs_listxattr,
884 .get_inode_acl = v9fs_iop_get_inode_acl,
885 .get_acl = v9fs_iop_get_acl,
886 .set_acl = v9fs_iop_set_acl,
887 };
888
889 const struct inode_operations v9fs_file_inode_operations_dotl = {
890 .getattr = v9fs_vfs_getattr_dotl,
891 .setattr = v9fs_vfs_setattr_dotl,
892 .listxattr = v9fs_listxattr,
893 .get_inode_acl = v9fs_iop_get_inode_acl,
894 .get_acl = v9fs_iop_get_acl,
895 .set_acl = v9fs_iop_set_acl,
896 };
897
898 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
899 .get_link = v9fs_vfs_get_link_dotl,
900 .getattr = v9fs_vfs_getattr_dotl,
901 .setattr = v9fs_vfs_setattr_dotl,
902 .listxattr = v9fs_listxattr,
903 };
904