1 /*
2 * linux/fs/9p/vfs_inode_dotl.c
3 *
4 * This file contains vfs inode ops for the 9P2000.L protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/file.h>
30 #include <linux/pagemap.h>
31 #include <linux/stat.h>
32 #include <linux/string.h>
33 #include <linux/inet.h>
34 #include <linux/namei.h>
35 #include <linux/idr.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/xattr.h>
39 #include <linux/posix_acl.h>
40 #include <net/9p/9p.h>
41 #include <net/9p/client.h>
42
43 #include "v9fs.h"
44 #include "v9fs_vfs.h"
45 #include "fid.h"
46 #include "cache.h"
47 #include "xattr.h"
48 #include "acl.h"
49
50 static int
51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
52 dev_t rdev);
53
54 /**
55 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
56 * new file system object. This checks the S_ISGID to determine the owning
57 * group of the new file system object.
58 */
59
v9fs_get_fsgid_for_create(struct inode * dir_inode)60 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
61 {
62 BUG_ON(dir_inode == NULL);
63
64 if (dir_inode->i_mode & S_ISGID) {
65 /* set_gid bit is set.*/
66 return dir_inode->i_gid;
67 }
68 return current_fsgid();
69 }
70
v9fs_test_inode_dotl(struct inode * inode,void * data)71 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
72 {
73 struct v9fs_inode *v9inode = V9FS_I(inode);
74 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
75
76 /* don't match inode of different type */
77 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
78 return 0;
79
80 if (inode->i_generation != st->st_gen)
81 return 0;
82
83 /* compare qid details */
84 if (memcmp(&v9inode->qid.version,
85 &st->qid.version, sizeof(v9inode->qid.version)))
86 return 0;
87
88 if (v9inode->qid.type != st->qid.type)
89 return 0;
90
91 if (v9inode->qid.path != st->qid.path)
92 return 0;
93 return 1;
94 }
95
96 /* Always get a new inode */
v9fs_test_new_inode_dotl(struct inode * inode,void * data)97 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
98 {
99 return 0;
100 }
101
v9fs_set_inode_dotl(struct inode * inode,void * data)102 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
103 {
104 struct v9fs_inode *v9inode = V9FS_I(inode);
105 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
106
107 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
108 inode->i_generation = st->st_gen;
109 return 0;
110 }
111
v9fs_qid_iget_dotl(struct super_block * sb,struct p9_qid * qid,struct p9_fid * fid,struct p9_stat_dotl * st,int new)112 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
113 struct p9_qid *qid,
114 struct p9_fid *fid,
115 struct p9_stat_dotl *st,
116 int new)
117 {
118 int retval;
119 unsigned long i_ino;
120 struct inode *inode;
121 struct v9fs_session_info *v9ses = sb->s_fs_info;
122 int (*test)(struct inode *, void *);
123
124 if (new)
125 test = v9fs_test_new_inode_dotl;
126 else
127 test = v9fs_test_inode_dotl;
128
129 i_ino = v9fs_qid2ino(qid);
130 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
131 if (!inode)
132 return ERR_PTR(-ENOMEM);
133 if (!(inode->i_state & I_NEW))
134 return inode;
135 /*
136 * initialize the inode with the stat info
137 * FIXME!! we may need support for stale inodes
138 * later.
139 */
140 inode->i_ino = i_ino;
141 retval = v9fs_init_inode(v9ses, inode,
142 st->st_mode, new_decode_dev(st->st_rdev));
143 if (retval)
144 goto error;
145
146 v9fs_stat2inode_dotl(st, inode, 0);
147 v9fs_cache_inode_get_cookie(inode);
148 retval = v9fs_get_acl(inode, fid);
149 if (retval)
150 goto error;
151
152 unlock_new_inode(inode);
153 return inode;
154 error:
155 iget_failed(inode);
156 return ERR_PTR(retval);
157
158 }
159
160 struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info * v9ses,struct p9_fid * fid,struct super_block * sb,int new)161 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
162 struct super_block *sb, int new)
163 {
164 struct p9_stat_dotl *st;
165 struct inode *inode = NULL;
166
167 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
168 if (IS_ERR(st))
169 return ERR_CAST(st);
170
171 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
172 kfree(st);
173 return inode;
174 }
175
176 struct dotl_openflag_map {
177 int open_flag;
178 int dotl_flag;
179 };
180
v9fs_mapped_dotl_flags(int flags)181 static int v9fs_mapped_dotl_flags(int flags)
182 {
183 int i;
184 int rflags = 0;
185 struct dotl_openflag_map dotl_oflag_map[] = {
186 { O_CREAT, P9_DOTL_CREATE },
187 { O_EXCL, P9_DOTL_EXCL },
188 { O_NOCTTY, P9_DOTL_NOCTTY },
189 { O_APPEND, P9_DOTL_APPEND },
190 { O_NONBLOCK, P9_DOTL_NONBLOCK },
191 { O_DSYNC, P9_DOTL_DSYNC },
192 { FASYNC, P9_DOTL_FASYNC },
193 { O_DIRECT, P9_DOTL_DIRECT },
194 { O_LARGEFILE, P9_DOTL_LARGEFILE },
195 { O_DIRECTORY, P9_DOTL_DIRECTORY },
196 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
197 { O_NOATIME, P9_DOTL_NOATIME },
198 { O_CLOEXEC, P9_DOTL_CLOEXEC },
199 { O_SYNC, P9_DOTL_SYNC},
200 };
201 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
202 if (flags & dotl_oflag_map[i].open_flag)
203 rflags |= dotl_oflag_map[i].dotl_flag;
204 }
205 return rflags;
206 }
207
208 /**
209 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
210 * plan 9 open flag.
211 * @flags: flags to convert
212 */
v9fs_open_to_dotl_flags(int flags)213 int v9fs_open_to_dotl_flags(int flags)
214 {
215 int rflags = 0;
216
217 /*
218 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
219 * and P9_DOTL_NOACCESS
220 */
221 rflags |= flags & O_ACCMODE;
222 rflags |= v9fs_mapped_dotl_flags(flags);
223
224 return rflags;
225 }
226
227 /**
228 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
229 * @dir: directory inode that is being created
230 * @dentry: dentry that is being deleted
231 * @omode: create permissions
232 *
233 */
234
235 static int
v9fs_vfs_create_dotl(struct inode * dir,struct dentry * dentry,umode_t omode,bool excl)236 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
237 bool excl)
238 {
239 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
240 }
241
242 static int
v9fs_vfs_atomic_open_dotl(struct inode * dir,struct dentry * dentry,struct file * file,unsigned flags,umode_t omode,int * opened)243 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
244 struct file *file, unsigned flags, umode_t omode,
245 int *opened)
246 {
247 int err = 0;
248 kgid_t gid;
249 umode_t mode;
250 char *name = NULL;
251 struct p9_qid qid;
252 struct inode *inode;
253 struct p9_fid *fid = NULL;
254 struct v9fs_inode *v9inode;
255 struct p9_fid *dfid, *ofid, *inode_fid;
256 struct v9fs_session_info *v9ses;
257 struct posix_acl *pacl = NULL, *dacl = NULL;
258 struct dentry *res = NULL;
259
260 if (d_unhashed(dentry)) {
261 res = v9fs_vfs_lookup(dir, dentry, 0);
262 if (IS_ERR(res))
263 return PTR_ERR(res);
264
265 if (res)
266 dentry = res;
267 }
268
269 /* Only creates */
270 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
271 return finish_no_open(file, res);
272
273 v9ses = v9fs_inode2v9ses(dir);
274
275 name = (char *) dentry->d_name.name;
276 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
277 name, flags, omode);
278
279 dfid = v9fs_fid_lookup(dentry->d_parent);
280 if (IS_ERR(dfid)) {
281 err = PTR_ERR(dfid);
282 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
283 goto out;
284 }
285
286 /* clone a fid to use for creation */
287 ofid = p9_client_walk(dfid, 0, NULL, 1);
288 if (IS_ERR(ofid)) {
289 err = PTR_ERR(ofid);
290 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
291 goto out;
292 }
293
294 gid = v9fs_get_fsgid_for_create(dir);
295
296 mode = omode;
297 /* Update mode based on ACL value */
298 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
299 if (err) {
300 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
301 err);
302 goto error;
303 }
304 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
305 mode, gid, &qid);
306 if (err < 0) {
307 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
308 err);
309 goto error;
310 }
311 v9fs_invalidate_inode_attr(dir);
312
313 /* instantiate inode and assign the unopened fid to the dentry */
314 fid = p9_client_walk(dfid, 1, &name, 1);
315 if (IS_ERR(fid)) {
316 err = PTR_ERR(fid);
317 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
318 fid = NULL;
319 goto error;
320 }
321 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
322 if (IS_ERR(inode)) {
323 err = PTR_ERR(inode);
324 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
325 goto error;
326 }
327 /* Now set the ACL based on the default value */
328 v9fs_set_create_acl(inode, fid, dacl, pacl);
329
330 v9fs_fid_add(dentry, fid);
331 d_instantiate(dentry, inode);
332
333 v9inode = V9FS_I(inode);
334 mutex_lock(&v9inode->v_mutex);
335 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
336 !v9inode->writeback_fid &&
337 ((flags & O_ACCMODE) != O_RDONLY)) {
338 /*
339 * clone a fid and add it to writeback_fid
340 * we do it during open time instead of
341 * page dirty time via write_begin/page_mkwrite
342 * because we want write after unlink usecase
343 * to work.
344 */
345 inode_fid = v9fs_writeback_fid(dentry);
346 if (IS_ERR(inode_fid)) {
347 err = PTR_ERR(inode_fid);
348 mutex_unlock(&v9inode->v_mutex);
349 goto err_clunk_old_fid;
350 }
351 v9inode->writeback_fid = (void *) inode_fid;
352 }
353 mutex_unlock(&v9inode->v_mutex);
354 /* Since we are opening a file, assign the open fid to the file */
355 err = finish_open(file, dentry, generic_file_open, opened);
356 if (err)
357 goto err_clunk_old_fid;
358 file->private_data = ofid;
359 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
360 v9fs_cache_inode_set_cookie(inode, file);
361 *opened |= FILE_CREATED;
362 out:
363 v9fs_put_acl(dacl, pacl);
364 dput(res);
365 return err;
366
367 error:
368 if (fid)
369 p9_client_clunk(fid);
370 err_clunk_old_fid:
371 if (ofid)
372 p9_client_clunk(ofid);
373 goto out;
374 }
375
376 /**
377 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
378 * @dir: inode that is being unlinked
379 * @dentry: dentry that is being unlinked
380 * @omode: mode for new directory
381 *
382 */
383
v9fs_vfs_mkdir_dotl(struct inode * dir,struct dentry * dentry,umode_t omode)384 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
385 struct dentry *dentry, umode_t omode)
386 {
387 int err;
388 struct v9fs_session_info *v9ses;
389 struct p9_fid *fid = NULL, *dfid = NULL;
390 kgid_t gid;
391 char *name;
392 umode_t mode;
393 struct inode *inode;
394 struct p9_qid qid;
395 struct dentry *dir_dentry;
396 struct posix_acl *dacl = NULL, *pacl = NULL;
397
398 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
399 err = 0;
400 v9ses = v9fs_inode2v9ses(dir);
401
402 omode |= S_IFDIR;
403 if (dir->i_mode & S_ISGID)
404 omode |= S_ISGID;
405
406 dir_dentry = dentry->d_parent;
407 dfid = v9fs_fid_lookup(dir_dentry);
408 if (IS_ERR(dfid)) {
409 err = PTR_ERR(dfid);
410 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
411 dfid = NULL;
412 goto error;
413 }
414
415 gid = v9fs_get_fsgid_for_create(dir);
416 mode = omode;
417 /* Update mode based on ACL value */
418 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
419 if (err) {
420 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
421 err);
422 goto error;
423 }
424 name = (char *) dentry->d_name.name;
425 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
426 if (err < 0)
427 goto error;
428
429 fid = p9_client_walk(dfid, 1, &name, 1);
430 if (IS_ERR(fid)) {
431 err = PTR_ERR(fid);
432 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
433 err);
434 fid = NULL;
435 goto error;
436 }
437
438 /* instantiate inode and assign the unopened fid to the dentry */
439 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
440 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
441 if (IS_ERR(inode)) {
442 err = PTR_ERR(inode);
443 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
444 err);
445 goto error;
446 }
447 v9fs_fid_add(dentry, fid);
448 v9fs_set_create_acl(inode, fid, dacl, pacl);
449 d_instantiate(dentry, inode);
450 fid = NULL;
451 err = 0;
452 } else {
453 /*
454 * Not in cached mode. No need to populate
455 * inode with stat. We need to get an inode
456 * so that we can set the acl with dentry
457 */
458 inode = v9fs_get_inode(dir->i_sb, mode, 0);
459 if (IS_ERR(inode)) {
460 err = PTR_ERR(inode);
461 goto error;
462 }
463 v9fs_set_create_acl(inode, fid, dacl, pacl);
464 d_instantiate(dentry, inode);
465 }
466 inc_nlink(dir);
467 v9fs_invalidate_inode_attr(dir);
468 error:
469 if (fid)
470 p9_client_clunk(fid);
471 v9fs_put_acl(dacl, pacl);
472 return err;
473 }
474
475 static int
v9fs_vfs_getattr_dotl(struct vfsmount * mnt,struct dentry * dentry,struct kstat * stat)476 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
477 struct kstat *stat)
478 {
479 struct v9fs_session_info *v9ses;
480 struct p9_fid *fid;
481 struct p9_stat_dotl *st;
482
483 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
484 v9ses = v9fs_dentry2v9ses(dentry);
485 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
486 generic_fillattr(d_inode(dentry), stat);
487 return 0;
488 }
489 fid = v9fs_fid_lookup(dentry);
490 if (IS_ERR(fid))
491 return PTR_ERR(fid);
492
493 /* Ask for all the fields in stat structure. Server will return
494 * whatever it supports
495 */
496
497 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
498 if (IS_ERR(st))
499 return PTR_ERR(st);
500
501 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
502 generic_fillattr(d_inode(dentry), stat);
503 /* Change block size to what the server returned */
504 stat->blksize = st->st_blksize;
505
506 kfree(st);
507 return 0;
508 }
509
510 /*
511 * Attribute flags.
512 */
513 #define P9_ATTR_MODE (1 << 0)
514 #define P9_ATTR_UID (1 << 1)
515 #define P9_ATTR_GID (1 << 2)
516 #define P9_ATTR_SIZE (1 << 3)
517 #define P9_ATTR_ATIME (1 << 4)
518 #define P9_ATTR_MTIME (1 << 5)
519 #define P9_ATTR_CTIME (1 << 6)
520 #define P9_ATTR_ATIME_SET (1 << 7)
521 #define P9_ATTR_MTIME_SET (1 << 8)
522
523 struct dotl_iattr_map {
524 int iattr_valid;
525 int p9_iattr_valid;
526 };
527
v9fs_mapped_iattr_valid(int iattr_valid)528 static int v9fs_mapped_iattr_valid(int iattr_valid)
529 {
530 int i;
531 int p9_iattr_valid = 0;
532 struct dotl_iattr_map dotl_iattr_map[] = {
533 { ATTR_MODE, P9_ATTR_MODE },
534 { ATTR_UID, P9_ATTR_UID },
535 { ATTR_GID, P9_ATTR_GID },
536 { ATTR_SIZE, P9_ATTR_SIZE },
537 { ATTR_ATIME, P9_ATTR_ATIME },
538 { ATTR_MTIME, P9_ATTR_MTIME },
539 { ATTR_CTIME, P9_ATTR_CTIME },
540 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
541 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
542 };
543 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
544 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
545 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
546 }
547 return p9_iattr_valid;
548 }
549
550 /**
551 * v9fs_vfs_setattr_dotl - set file metadata
552 * @dentry: file whose metadata to set
553 * @iattr: metadata assignment structure
554 *
555 */
556
v9fs_vfs_setattr_dotl(struct dentry * dentry,struct iattr * iattr)557 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
558 {
559 int retval;
560 struct p9_fid *fid;
561 struct p9_iattr_dotl p9attr;
562 struct inode *inode = d_inode(dentry);
563
564 p9_debug(P9_DEBUG_VFS, "\n");
565
566 retval = inode_change_ok(inode, iattr);
567 if (retval)
568 return retval;
569
570 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
571 p9attr.mode = iattr->ia_mode;
572 p9attr.uid = iattr->ia_uid;
573 p9attr.gid = iattr->ia_gid;
574 p9attr.size = iattr->ia_size;
575 p9attr.atime_sec = iattr->ia_atime.tv_sec;
576 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
577 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
578 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
579
580 fid = v9fs_fid_lookup(dentry);
581 if (IS_ERR(fid))
582 return PTR_ERR(fid);
583
584 /* Write all dirty data */
585 if (S_ISREG(inode->i_mode))
586 filemap_write_and_wait(inode->i_mapping);
587
588 retval = p9_client_setattr(fid, &p9attr);
589 if (retval < 0)
590 return retval;
591
592 if ((iattr->ia_valid & ATTR_SIZE) &&
593 iattr->ia_size != i_size_read(inode))
594 truncate_setsize(inode, iattr->ia_size);
595
596 v9fs_invalidate_inode_attr(inode);
597 setattr_copy(inode, iattr);
598 mark_inode_dirty(inode);
599 if (iattr->ia_valid & ATTR_MODE) {
600 /* We also want to update ACL when we update mode bits */
601 retval = v9fs_acl_chmod(inode, fid);
602 if (retval < 0)
603 return retval;
604 }
605 return 0;
606 }
607
608 /**
609 * v9fs_stat2inode_dotl - populate an inode structure with stat info
610 * @stat: stat structure
611 * @inode: inode to populate
612 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
613 *
614 */
615
616 void
v9fs_stat2inode_dotl(struct p9_stat_dotl * stat,struct inode * inode,unsigned int flags)617 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
618 unsigned int flags)
619 {
620 umode_t mode;
621 struct v9fs_inode *v9inode = V9FS_I(inode);
622
623 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
624 inode->i_atime.tv_sec = stat->st_atime_sec;
625 inode->i_atime.tv_nsec = stat->st_atime_nsec;
626 inode->i_mtime.tv_sec = stat->st_mtime_sec;
627 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
628 inode->i_ctime.tv_sec = stat->st_ctime_sec;
629 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
630 inode->i_uid = stat->st_uid;
631 inode->i_gid = stat->st_gid;
632 set_nlink(inode, stat->st_nlink);
633
634 mode = stat->st_mode & S_IALLUGO;
635 mode |= inode->i_mode & ~S_IALLUGO;
636 inode->i_mode = mode;
637
638 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
639 v9fs_i_size_write(inode, stat->st_size);
640 inode->i_blocks = stat->st_blocks;
641 } else {
642 if (stat->st_result_mask & P9_STATS_ATIME) {
643 inode->i_atime.tv_sec = stat->st_atime_sec;
644 inode->i_atime.tv_nsec = stat->st_atime_nsec;
645 }
646 if (stat->st_result_mask & P9_STATS_MTIME) {
647 inode->i_mtime.tv_sec = stat->st_mtime_sec;
648 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
649 }
650 if (stat->st_result_mask & P9_STATS_CTIME) {
651 inode->i_ctime.tv_sec = stat->st_ctime_sec;
652 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
653 }
654 if (stat->st_result_mask & P9_STATS_UID)
655 inode->i_uid = stat->st_uid;
656 if (stat->st_result_mask & P9_STATS_GID)
657 inode->i_gid = stat->st_gid;
658 if (stat->st_result_mask & P9_STATS_NLINK)
659 set_nlink(inode, stat->st_nlink);
660 if (stat->st_result_mask & P9_STATS_MODE) {
661 inode->i_mode = stat->st_mode;
662 if ((S_ISBLK(inode->i_mode)) ||
663 (S_ISCHR(inode->i_mode)))
664 init_special_inode(inode, inode->i_mode,
665 inode->i_rdev);
666 }
667 if (stat->st_result_mask & P9_STATS_RDEV)
668 inode->i_rdev = new_decode_dev(stat->st_rdev);
669 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
670 stat->st_result_mask & P9_STATS_SIZE)
671 v9fs_i_size_write(inode, stat->st_size);
672 if (stat->st_result_mask & P9_STATS_BLOCKS)
673 inode->i_blocks = stat->st_blocks;
674 }
675 if (stat->st_result_mask & P9_STATS_GEN)
676 inode->i_generation = stat->st_gen;
677
678 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
679 * because the inode structure does not have fields for them.
680 */
681 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
682 }
683
684 static int
v9fs_vfs_symlink_dotl(struct inode * dir,struct dentry * dentry,const char * symname)685 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
686 const char *symname)
687 {
688 int err;
689 kgid_t gid;
690 char *name;
691 struct p9_qid qid;
692 struct inode *inode;
693 struct p9_fid *dfid;
694 struct p9_fid *fid = NULL;
695 struct v9fs_session_info *v9ses;
696
697 name = (char *) dentry->d_name.name;
698 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
699 v9ses = v9fs_inode2v9ses(dir);
700
701 dfid = v9fs_fid_lookup(dentry->d_parent);
702 if (IS_ERR(dfid)) {
703 err = PTR_ERR(dfid);
704 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
705 return err;
706 }
707
708 gid = v9fs_get_fsgid_for_create(dir);
709
710 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
711 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
712
713 if (err < 0) {
714 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
715 goto error;
716 }
717
718 v9fs_invalidate_inode_attr(dir);
719 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
720 /* Now walk from the parent so we can get an unopened fid. */
721 fid = p9_client_walk(dfid, 1, &name, 1);
722 if (IS_ERR(fid)) {
723 err = PTR_ERR(fid);
724 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
725 err);
726 fid = NULL;
727 goto error;
728 }
729
730 /* instantiate inode and assign the unopened fid to dentry */
731 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
732 if (IS_ERR(inode)) {
733 err = PTR_ERR(inode);
734 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
735 err);
736 goto error;
737 }
738 v9fs_fid_add(dentry, fid);
739 d_instantiate(dentry, inode);
740 fid = NULL;
741 err = 0;
742 } else {
743 /* Not in cached mode. No need to populate inode with stat */
744 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
745 if (IS_ERR(inode)) {
746 err = PTR_ERR(inode);
747 goto error;
748 }
749 d_instantiate(dentry, inode);
750 }
751
752 error:
753 if (fid)
754 p9_client_clunk(fid);
755
756 return err;
757 }
758
759 /**
760 * v9fs_vfs_link_dotl - create a hardlink for dotl
761 * @old_dentry: dentry for file to link to
762 * @dir: inode destination for new link
763 * @dentry: dentry for link
764 *
765 */
766
767 static int
v9fs_vfs_link_dotl(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)768 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
769 struct dentry *dentry)
770 {
771 int err;
772 struct dentry *dir_dentry;
773 struct p9_fid *dfid, *oldfid;
774 struct v9fs_session_info *v9ses;
775
776 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
777 dir->i_ino, old_dentry, dentry);
778
779 v9ses = v9fs_inode2v9ses(dir);
780 dir_dentry = dentry->d_parent;
781 dfid = v9fs_fid_lookup(dir_dentry);
782 if (IS_ERR(dfid))
783 return PTR_ERR(dfid);
784
785 oldfid = v9fs_fid_lookup(old_dentry);
786 if (IS_ERR(oldfid))
787 return PTR_ERR(oldfid);
788
789 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
790
791 if (err < 0) {
792 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
793 return err;
794 }
795
796 v9fs_invalidate_inode_attr(dir);
797 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
798 /* Get the latest stat info from server. */
799 struct p9_fid *fid;
800 fid = v9fs_fid_lookup(old_dentry);
801 if (IS_ERR(fid))
802 return PTR_ERR(fid);
803
804 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
805 }
806 ihold(d_inode(old_dentry));
807 d_instantiate(dentry, d_inode(old_dentry));
808
809 return err;
810 }
811
812 /**
813 * v9fs_vfs_mknod_dotl - create a special file
814 * @dir: inode destination for new link
815 * @dentry: dentry for file
816 * @omode: mode for creation
817 * @rdev: device associated with special file
818 *
819 */
820 static int
v9fs_vfs_mknod_dotl(struct inode * dir,struct dentry * dentry,umode_t omode,dev_t rdev)821 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
822 dev_t rdev)
823 {
824 int err;
825 kgid_t gid;
826 char *name;
827 umode_t mode;
828 struct v9fs_session_info *v9ses;
829 struct p9_fid *fid = NULL, *dfid = NULL;
830 struct inode *inode;
831 struct p9_qid qid;
832 struct dentry *dir_dentry;
833 struct posix_acl *dacl = NULL, *pacl = NULL;
834
835 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
836 dir->i_ino, dentry, omode,
837 MAJOR(rdev), MINOR(rdev));
838
839 v9ses = v9fs_inode2v9ses(dir);
840 dir_dentry = dentry->d_parent;
841 dfid = v9fs_fid_lookup(dir_dentry);
842 if (IS_ERR(dfid)) {
843 err = PTR_ERR(dfid);
844 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
845 dfid = NULL;
846 goto error;
847 }
848
849 gid = v9fs_get_fsgid_for_create(dir);
850 mode = omode;
851 /* Update mode based on ACL value */
852 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
853 if (err) {
854 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
855 err);
856 goto error;
857 }
858 name = (char *) dentry->d_name.name;
859
860 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
861 if (err < 0)
862 goto error;
863
864 v9fs_invalidate_inode_attr(dir);
865 fid = p9_client_walk(dfid, 1, &name, 1);
866 if (IS_ERR(fid)) {
867 err = PTR_ERR(fid);
868 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
869 err);
870 fid = NULL;
871 goto error;
872 }
873
874 /* instantiate inode and assign the unopened fid to the dentry */
875 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
876 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
877 if (IS_ERR(inode)) {
878 err = PTR_ERR(inode);
879 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
880 err);
881 goto error;
882 }
883 v9fs_set_create_acl(inode, fid, dacl, pacl);
884 v9fs_fid_add(dentry, fid);
885 d_instantiate(dentry, inode);
886 fid = NULL;
887 err = 0;
888 } else {
889 /*
890 * Not in cached mode. No need to populate inode with stat.
891 * socket syscall returns a fd, so we need instantiate
892 */
893 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
894 if (IS_ERR(inode)) {
895 err = PTR_ERR(inode);
896 goto error;
897 }
898 v9fs_set_create_acl(inode, fid, dacl, pacl);
899 d_instantiate(dentry, inode);
900 }
901 error:
902 if (fid)
903 p9_client_clunk(fid);
904 v9fs_put_acl(dacl, pacl);
905 return err;
906 }
907
908 /**
909 * v9fs_vfs_follow_link_dotl - follow a symlink path
910 * @dentry: dentry for symlink
911 * @cookie: place to pass the data to put_link()
912 */
913
914 static const char *
v9fs_vfs_follow_link_dotl(struct dentry * dentry,void ** cookie)915 v9fs_vfs_follow_link_dotl(struct dentry *dentry, void **cookie)
916 {
917 struct p9_fid *fid = v9fs_fid_lookup(dentry);
918 char *target;
919 int retval;
920
921 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
922
923 if (IS_ERR(fid))
924 return ERR_CAST(fid);
925 retval = p9_client_readlink(fid, &target);
926 if (retval)
927 return ERR_PTR(retval);
928 return *cookie = target;
929 }
930
v9fs_refresh_inode_dotl(struct p9_fid * fid,struct inode * inode)931 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
932 {
933 struct p9_stat_dotl *st;
934 struct v9fs_session_info *v9ses;
935 unsigned int flags;
936
937 v9ses = v9fs_inode2v9ses(inode);
938 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
939 if (IS_ERR(st))
940 return PTR_ERR(st);
941 /*
942 * Don't update inode if the file type is different
943 */
944 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
945 goto out;
946
947 /*
948 * We don't want to refresh inode->i_size,
949 * because we may have cached data
950 */
951 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
952 V9FS_STAT2INODE_KEEP_ISIZE : 0;
953 v9fs_stat2inode_dotl(st, inode, flags);
954 out:
955 kfree(st);
956 return 0;
957 }
958
959 const struct inode_operations v9fs_dir_inode_operations_dotl = {
960 .create = v9fs_vfs_create_dotl,
961 .atomic_open = v9fs_vfs_atomic_open_dotl,
962 .lookup = v9fs_vfs_lookup,
963 .link = v9fs_vfs_link_dotl,
964 .symlink = v9fs_vfs_symlink_dotl,
965 .unlink = v9fs_vfs_unlink,
966 .mkdir = v9fs_vfs_mkdir_dotl,
967 .rmdir = v9fs_vfs_rmdir,
968 .mknod = v9fs_vfs_mknod_dotl,
969 .rename = v9fs_vfs_rename,
970 .getattr = v9fs_vfs_getattr_dotl,
971 .setattr = v9fs_vfs_setattr_dotl,
972 .setxattr = generic_setxattr,
973 .getxattr = generic_getxattr,
974 .removexattr = generic_removexattr,
975 .listxattr = v9fs_listxattr,
976 .get_acl = v9fs_iop_get_acl,
977 };
978
979 const struct inode_operations v9fs_file_inode_operations_dotl = {
980 .getattr = v9fs_vfs_getattr_dotl,
981 .setattr = v9fs_vfs_setattr_dotl,
982 .setxattr = generic_setxattr,
983 .getxattr = generic_getxattr,
984 .removexattr = generic_removexattr,
985 .listxattr = v9fs_listxattr,
986 .get_acl = v9fs_iop_get_acl,
987 };
988
989 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
990 .readlink = generic_readlink,
991 .follow_link = v9fs_vfs_follow_link_dotl,
992 .put_link = kfree_put_link,
993 .getattr = v9fs_vfs_getattr_dotl,
994 .setattr = v9fs_vfs_setattr_dotl,
995 .setxattr = generic_setxattr,
996 .getxattr = generic_getxattr,
997 .removexattr = generic_removexattr,
998 .listxattr = v9fs_listxattr,
999 };
1000