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/inet.h>
17 #include <linux/namei.h>
18 #include <linux/idr.h>
19 #include <linux/sched.h>
20 #include <linux/slab.h>
21 #include <linux/xattr.h>
22 #include <linux/posix_acl.h>
23 #include <net/9p/9p.h>
24 #include <net/9p/client.h>
25
26 #include "v9fs.h"
27 #include "v9fs_vfs.h"
28 #include "fid.h"
29 #include "cache.h"
30 #include "xattr.h"
31 #include "acl.h"
32
33 static int
34 v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
35 struct dentry *dentry, umode_t omode, dev_t rdev);
36
37 /**
38 * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object
39 * @dir_inode: The directory inode
40 *
41 * Helper function to get the gid for creating a
42 * new file system object. This checks the S_ISGID to determine the owning
43 * group of the new file system object.
44 */
45
v9fs_get_fsgid_for_create(struct inode * dir_inode)46 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
47 {
48 BUG_ON(dir_inode == NULL);
49
50 if (dir_inode->i_mode & S_ISGID) {
51 /* set_gid bit is set.*/
52 return dir_inode->i_gid;
53 }
54 return current_fsgid();
55 }
56
v9fs_test_inode_dotl(struct inode * inode,void * data)57 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
58 {
59 struct v9fs_inode *v9inode = V9FS_I(inode);
60 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
61
62 /* don't match inode of different type */
63 if (inode_wrong_type(inode, st->st_mode))
64 return 0;
65
66 if (inode->i_generation != st->st_gen)
67 return 0;
68
69 /* compare qid details */
70 if (memcmp(&v9inode->qid.version,
71 &st->qid.version, sizeof(v9inode->qid.version)))
72 return 0;
73
74 if (v9inode->qid.type != st->qid.type)
75 return 0;
76
77 if (v9inode->qid.path != st->qid.path)
78 return 0;
79 return 1;
80 }
81
82 /* Always get a new inode */
v9fs_test_new_inode_dotl(struct inode * inode,void * data)83 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
84 {
85 return 0;
86 }
87
v9fs_set_inode_dotl(struct inode * inode,void * data)88 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
89 {
90 struct v9fs_inode *v9inode = V9FS_I(inode);
91 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
92
93 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
94 inode->i_generation = st->st_gen;
95 return 0;
96 }
97
v9fs_qid_iget_dotl(struct super_block * sb,struct p9_qid * qid,struct p9_fid * fid,struct p9_stat_dotl * st,int new)98 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
99 struct p9_qid *qid,
100 struct p9_fid *fid,
101 struct p9_stat_dotl *st,
102 int new)
103 {
104 int retval;
105 unsigned long i_ino;
106 struct inode *inode;
107 struct v9fs_session_info *v9ses = sb->s_fs_info;
108 int (*test)(struct inode *inode, void *data);
109
110 if (new)
111 test = v9fs_test_new_inode_dotl;
112 else
113 test = v9fs_test_inode_dotl;
114
115 i_ino = v9fs_qid2ino(qid);
116 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
117 if (!inode)
118 return ERR_PTR(-ENOMEM);
119 if (!(inode->i_state & I_NEW))
120 return inode;
121 /*
122 * initialize the inode with the stat info
123 * FIXME!! we may need support for stale inodes
124 * later.
125 */
126 inode->i_ino = i_ino;
127 retval = v9fs_init_inode(v9ses, inode,
128 st->st_mode, new_decode_dev(st->st_rdev));
129 if (retval)
130 goto error;
131
132 v9fs_stat2inode_dotl(st, inode, 0);
133 v9fs_cache_inode_get_cookie(inode);
134 retval = v9fs_get_acl(inode, fid);
135 if (retval)
136 goto error;
137
138 unlock_new_inode(inode);
139 return inode;
140 error:
141 iget_failed(inode);
142 return ERR_PTR(retval);
143
144 }
145
146 struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info * v9ses,struct p9_fid * fid,struct super_block * sb,int new)147 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
148 struct super_block *sb, int new)
149 {
150 struct p9_stat_dotl *st;
151 struct inode *inode = NULL;
152
153 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
154 if (IS_ERR(st))
155 return ERR_CAST(st);
156
157 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
158 kfree(st);
159 return inode;
160 }
161
162 struct dotl_openflag_map {
163 int open_flag;
164 int dotl_flag;
165 };
166
v9fs_mapped_dotl_flags(int flags)167 static int v9fs_mapped_dotl_flags(int flags)
168 {
169 int i;
170 int rflags = 0;
171 struct dotl_openflag_map dotl_oflag_map[] = {
172 { O_CREAT, P9_DOTL_CREATE },
173 { O_EXCL, P9_DOTL_EXCL },
174 { O_NOCTTY, P9_DOTL_NOCTTY },
175 { O_APPEND, P9_DOTL_APPEND },
176 { O_NONBLOCK, P9_DOTL_NONBLOCK },
177 { O_DSYNC, P9_DOTL_DSYNC },
178 { FASYNC, P9_DOTL_FASYNC },
179 { O_DIRECT, P9_DOTL_DIRECT },
180 { O_LARGEFILE, P9_DOTL_LARGEFILE },
181 { O_DIRECTORY, P9_DOTL_DIRECTORY },
182 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
183 { O_NOATIME, P9_DOTL_NOATIME },
184 { O_CLOEXEC, P9_DOTL_CLOEXEC },
185 { O_SYNC, P9_DOTL_SYNC},
186 };
187 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
188 if (flags & dotl_oflag_map[i].open_flag)
189 rflags |= dotl_oflag_map[i].dotl_flag;
190 }
191 return rflags;
192 }
193
194 /**
195 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
196 * plan 9 open flag.
197 * @flags: flags to convert
198 */
v9fs_open_to_dotl_flags(int flags)199 int v9fs_open_to_dotl_flags(int flags)
200 {
201 int rflags = 0;
202
203 /*
204 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
205 * and P9_DOTL_NOACCESS
206 */
207 rflags |= flags & O_ACCMODE;
208 rflags |= v9fs_mapped_dotl_flags(flags);
209
210 return rflags;
211 }
212
213 /**
214 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
215 * @mnt_userns: The user namespace of the mount
216 * @dir: directory inode that is being created
217 * @dentry: dentry that is being deleted
218 * @omode: create permissions
219 * @excl: True if the file must not yet exist
220 *
221 */
222 static int
v9fs_vfs_create_dotl(struct user_namespace * mnt_userns,struct inode * dir,struct dentry * dentry,umode_t omode,bool excl)223 v9fs_vfs_create_dotl(struct user_namespace *mnt_userns, struct inode *dir,
224 struct dentry *dentry, umode_t omode, bool excl)
225 {
226 return v9fs_vfs_mknod_dotl(mnt_userns, dir, dentry, omode, 0);
227 }
228
229 static int
v9fs_vfs_atomic_open_dotl(struct inode * dir,struct dentry * dentry,struct file * file,unsigned int flags,umode_t omode)230 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
231 struct file *file, unsigned int flags, umode_t omode)
232 {
233 int err = 0;
234 kgid_t gid;
235 umode_t mode;
236 const unsigned char *name = NULL;
237 struct p9_qid qid;
238 struct inode *inode;
239 struct p9_fid *fid = NULL;
240 struct v9fs_inode *v9inode;
241 struct p9_fid *dfid = NULL, *ofid = NULL, *inode_fid = NULL;
242 struct v9fs_session_info *v9ses;
243 struct posix_acl *pacl = NULL, *dacl = NULL;
244 struct dentry *res = NULL;
245
246 if (d_in_lookup(dentry)) {
247 res = v9fs_vfs_lookup(dir, dentry, 0);
248 if (IS_ERR(res))
249 return PTR_ERR(res);
250
251 if (res)
252 dentry = res;
253 }
254
255 /* Only creates */
256 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
257 return finish_no_open(file, res);
258
259 v9ses = v9fs_inode2v9ses(dir);
260
261 name = dentry->d_name.name;
262 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
263 name, flags, omode);
264
265 dfid = v9fs_parent_fid(dentry);
266 if (IS_ERR(dfid)) {
267 err = PTR_ERR(dfid);
268 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
269 goto out;
270 }
271
272 /* clone a fid to use for creation */
273 ofid = clone_fid(dfid);
274 if (IS_ERR(ofid)) {
275 err = PTR_ERR(ofid);
276 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
277 goto out;
278 }
279
280 gid = v9fs_get_fsgid_for_create(dir);
281
282 mode = omode;
283 /* Update mode based on ACL value */
284 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
285 if (err) {
286 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
287 err);
288 goto out;
289 }
290 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
291 mode, gid, &qid);
292 if (err < 0) {
293 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
294 err);
295 goto out;
296 }
297 v9fs_invalidate_inode_attr(dir);
298
299 /* instantiate inode and assign the unopened fid to the dentry */
300 fid = p9_client_walk(dfid, 1, &name, 1);
301 if (IS_ERR(fid)) {
302 err = PTR_ERR(fid);
303 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
304 goto out;
305 }
306 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
307 if (IS_ERR(inode)) {
308 err = PTR_ERR(inode);
309 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
310 goto out;
311 }
312 /* Now set the ACL based on the default value */
313 v9fs_set_create_acl(inode, fid, dacl, pacl);
314
315 v9fs_fid_add(dentry, &fid);
316 d_instantiate(dentry, inode);
317
318 v9inode = V9FS_I(inode);
319 mutex_lock(&v9inode->v_mutex);
320 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
321 !v9inode->writeback_fid &&
322 ((flags & O_ACCMODE) != O_RDONLY)) {
323 /*
324 * clone a fid and add it to writeback_fid
325 * we do it during open time instead of
326 * page dirty time via write_begin/page_mkwrite
327 * because we want write after unlink usecase
328 * to work.
329 */
330 inode_fid = v9fs_writeback_fid(dentry);
331 if (IS_ERR(inode_fid)) {
332 err = PTR_ERR(inode_fid);
333 mutex_unlock(&v9inode->v_mutex);
334 goto out;
335 }
336 v9inode->writeback_fid = (void *) inode_fid;
337 }
338 mutex_unlock(&v9inode->v_mutex);
339 /* Since we are opening a file, assign the open fid to the file */
340 err = finish_open(file, dentry, generic_file_open);
341 if (err)
342 goto out;
343 file->private_data = ofid;
344 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
345 fscache_use_cookie(v9fs_inode_cookie(v9inode),
346 file->f_mode & FMODE_WRITE);
347 v9fs_open_fid_add(inode, &ofid);
348 file->f_mode |= FMODE_CREATED;
349 out:
350 p9_fid_put(dfid);
351 p9_fid_put(ofid);
352 p9_fid_put(fid);
353 v9fs_put_acl(dacl, pacl);
354 dput(res);
355 return err;
356 }
357
358 /**
359 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
360 * @mnt_userns: The user namespace of the mount
361 * @dir: inode that is being unlinked
362 * @dentry: dentry that is being unlinked
363 * @omode: mode for new directory
364 *
365 */
366
v9fs_vfs_mkdir_dotl(struct user_namespace * mnt_userns,struct inode * dir,struct dentry * dentry,umode_t omode)367 static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns,
368 struct inode *dir, struct dentry *dentry,
369 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 goto error;
394 }
395
396 gid = v9fs_get_fsgid_for_create(dir);
397 mode = omode;
398 /* Update mode based on ACL value */
399 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
400 if (err) {
401 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
402 err);
403 goto error;
404 }
405 name = dentry->d_name.name;
406 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
407 if (err < 0)
408 goto error;
409 fid = p9_client_walk(dfid, 1, &name, 1);
410 if (IS_ERR(fid)) {
411 err = PTR_ERR(fid);
412 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
413 err);
414 goto error;
415 }
416
417 /* instantiate inode and assign the unopened fid to the dentry */
418 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
419 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
420 if (IS_ERR(inode)) {
421 err = PTR_ERR(inode);
422 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
423 err);
424 goto error;
425 }
426 v9fs_fid_add(dentry, &fid);
427 v9fs_set_create_acl(inode, fid, dacl, pacl);
428 d_instantiate(dentry, inode);
429 err = 0;
430 } else {
431 /*
432 * Not in cached mode. No need to populate
433 * inode with stat. We need to get an inode
434 * so that we can set the acl with dentry
435 */
436 inode = v9fs_get_inode(dir->i_sb, mode, 0);
437 if (IS_ERR(inode)) {
438 err = PTR_ERR(inode);
439 goto error;
440 }
441 v9fs_set_create_acl(inode, fid, dacl, pacl);
442 d_instantiate(dentry, inode);
443 }
444 inc_nlink(dir);
445 v9fs_invalidate_inode_attr(dir);
446 error:
447 p9_fid_put(fid);
448 v9fs_put_acl(dacl, pacl);
449 p9_fid_put(dfid);
450 return err;
451 }
452
453 static int
v9fs_vfs_getattr_dotl(struct user_namespace * mnt_userns,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)454 v9fs_vfs_getattr_dotl(struct user_namespace *mnt_userns,
455 const struct path *path, struct kstat *stat,
456 u32 request_mask, unsigned int flags)
457 {
458 struct dentry *dentry = path->dentry;
459 struct v9fs_session_info *v9ses;
460 struct p9_fid *fid;
461 struct p9_stat_dotl *st;
462
463 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
464 v9ses = v9fs_dentry2v9ses(dentry);
465 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
466 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
467 return 0;
468 }
469 fid = v9fs_fid_lookup(dentry);
470 if (IS_ERR(fid))
471 return PTR_ERR(fid);
472
473 /* Ask for all the fields in stat structure. Server will return
474 * whatever it supports
475 */
476
477 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
478 p9_fid_put(fid);
479 if (IS_ERR(st))
480 return PTR_ERR(st);
481
482 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
483 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
484 /* Change block size to what the server returned */
485 stat->blksize = st->st_blksize;
486
487 kfree(st);
488 return 0;
489 }
490
491 /*
492 * Attribute flags.
493 */
494 #define P9_ATTR_MODE (1 << 0)
495 #define P9_ATTR_UID (1 << 1)
496 #define P9_ATTR_GID (1 << 2)
497 #define P9_ATTR_SIZE (1 << 3)
498 #define P9_ATTR_ATIME (1 << 4)
499 #define P9_ATTR_MTIME (1 << 5)
500 #define P9_ATTR_CTIME (1 << 6)
501 #define P9_ATTR_ATIME_SET (1 << 7)
502 #define P9_ATTR_MTIME_SET (1 << 8)
503
504 struct dotl_iattr_map {
505 int iattr_valid;
506 int p9_iattr_valid;
507 };
508
v9fs_mapped_iattr_valid(int iattr_valid)509 static int v9fs_mapped_iattr_valid(int iattr_valid)
510 {
511 int i;
512 int p9_iattr_valid = 0;
513 struct dotl_iattr_map dotl_iattr_map[] = {
514 { ATTR_MODE, P9_ATTR_MODE },
515 { ATTR_UID, P9_ATTR_UID },
516 { ATTR_GID, P9_ATTR_GID },
517 { ATTR_SIZE, P9_ATTR_SIZE },
518 { ATTR_ATIME, P9_ATTR_ATIME },
519 { ATTR_MTIME, P9_ATTR_MTIME },
520 { ATTR_CTIME, P9_ATTR_CTIME },
521 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
522 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
523 };
524 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
525 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
526 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
527 }
528 return p9_iattr_valid;
529 }
530
531 /**
532 * v9fs_vfs_setattr_dotl - set file metadata
533 * @mnt_userns: The user namespace of the mount
534 * @dentry: file whose metadata to set
535 * @iattr: metadata assignment structure
536 *
537 */
538
v9fs_vfs_setattr_dotl(struct user_namespace * mnt_userns,struct dentry * dentry,struct iattr * iattr)539 int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns,
540 struct dentry *dentry, struct iattr *iattr)
541 {
542 int retval, use_dentry = 0;
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(&init_user_ns, 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 use_dentry = 1;
581 }
582 if (IS_ERR(fid))
583 return PTR_ERR(fid);
584
585 /* Write all dirty data */
586 if (S_ISREG(inode->i_mode))
587 filemap_write_and_wait(inode->i_mapping);
588
589 retval = p9_client_setattr(fid, &p9attr);
590 if (retval < 0) {
591 if (use_dentry)
592 p9_fid_put(fid);
593 return retval;
594 }
595
596 if ((iattr->ia_valid & ATTR_SIZE) &&
597 iattr->ia_size != i_size_read(inode))
598 truncate_setsize(inode, iattr->ia_size);
599
600 v9fs_invalidate_inode_attr(inode);
601 setattr_copy(&init_user_ns, inode, iattr);
602 mark_inode_dirty(inode);
603 if (iattr->ia_valid & ATTR_MODE) {
604 /* We also want to update ACL when we update mode bits */
605 retval = v9fs_acl_chmod(inode, fid);
606 if (retval < 0) {
607 if (use_dentry)
608 p9_fid_put(fid);
609 return retval;
610 }
611 }
612 if (use_dentry)
613 p9_fid_put(fid);
614
615 return 0;
616 }
617
618 /**
619 * v9fs_stat2inode_dotl - populate an inode structure with stat info
620 * @stat: stat structure
621 * @inode: inode to populate
622 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
623 *
624 */
625
626 void
v9fs_stat2inode_dotl(struct p9_stat_dotl * stat,struct inode * inode,unsigned int flags)627 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
628 unsigned int flags)
629 {
630 umode_t mode;
631 struct v9fs_inode *v9inode = V9FS_I(inode);
632
633 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
634 inode->i_atime.tv_sec = stat->st_atime_sec;
635 inode->i_atime.tv_nsec = stat->st_atime_nsec;
636 inode->i_mtime.tv_sec = stat->st_mtime_sec;
637 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
638 inode->i_ctime.tv_sec = stat->st_ctime_sec;
639 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
640 inode->i_uid = stat->st_uid;
641 inode->i_gid = stat->st_gid;
642 set_nlink(inode, stat->st_nlink);
643
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 v9fs_i_size_write(inode, stat->st_size);
650 inode->i_blocks = stat->st_blocks;
651 } else {
652 if (stat->st_result_mask & P9_STATS_ATIME) {
653 inode->i_atime.tv_sec = stat->st_atime_sec;
654 inode->i_atime.tv_nsec = stat->st_atime_nsec;
655 }
656 if (stat->st_result_mask & P9_STATS_MTIME) {
657 inode->i_mtime.tv_sec = stat->st_mtime_sec;
658 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
659 }
660 if (stat->st_result_mask & P9_STATS_CTIME) {
661 inode->i_ctime.tv_sec = stat->st_ctime_sec;
662 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
663 }
664 if (stat->st_result_mask & P9_STATS_UID)
665 inode->i_uid = stat->st_uid;
666 if (stat->st_result_mask & P9_STATS_GID)
667 inode->i_gid = stat->st_gid;
668 if (stat->st_result_mask & P9_STATS_NLINK)
669 set_nlink(inode, stat->st_nlink);
670 if (stat->st_result_mask & P9_STATS_MODE) {
671 mode = stat->st_mode & S_IALLUGO;
672 mode |= inode->i_mode & ~S_IALLUGO;
673 inode->i_mode = mode;
674 }
675 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
676 stat->st_result_mask & P9_STATS_SIZE)
677 v9fs_i_size_write(inode, stat->st_size);
678 if (stat->st_result_mask & P9_STATS_BLOCKS)
679 inode->i_blocks = stat->st_blocks;
680 }
681 if (stat->st_result_mask & P9_STATS_GEN)
682 inode->i_generation = stat->st_gen;
683
684 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
685 * because the inode structure does not have fields for them.
686 */
687 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
688 }
689
690 static int
v9fs_vfs_symlink_dotl(struct user_namespace * mnt_userns,struct inode * dir,struct dentry * dentry,const char * symname)691 v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir,
692 struct dentry *dentry, const char *symname)
693 {
694 int err;
695 kgid_t gid;
696 const unsigned char *name;
697 struct p9_qid qid;
698 struct inode *inode;
699 struct p9_fid *dfid;
700 struct p9_fid *fid = NULL;
701 struct v9fs_session_info *v9ses;
702
703 name = dentry->d_name.name;
704 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
705 v9ses = v9fs_inode2v9ses(dir);
706
707 dfid = v9fs_parent_fid(dentry);
708 if (IS_ERR(dfid)) {
709 err = PTR_ERR(dfid);
710 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
711 return err;
712 }
713
714 gid = v9fs_get_fsgid_for_create(dir);
715
716 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
717 err = p9_client_symlink(dfid, name, symname, gid, &qid);
718
719 if (err < 0) {
720 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
721 goto error;
722 }
723
724 v9fs_invalidate_inode_attr(dir);
725 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
726 /* Now walk from the parent so we can get an unopened fid. */
727 fid = p9_client_walk(dfid, 1, &name, 1);
728 if (IS_ERR(fid)) {
729 err = PTR_ERR(fid);
730 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
731 err);
732 goto error;
733 }
734
735 /* instantiate inode and assign the unopened fid to dentry */
736 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
737 if (IS_ERR(inode)) {
738 err = PTR_ERR(inode);
739 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
740 err);
741 goto error;
742 }
743 v9fs_fid_add(dentry, &fid);
744 d_instantiate(dentry, inode);
745 err = 0;
746 } else {
747 /* Not in cached mode. No need to populate inode with stat */
748 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
749 if (IS_ERR(inode)) {
750 err = PTR_ERR(inode);
751 goto error;
752 }
753 d_instantiate(dentry, inode);
754 }
755
756 error:
757 p9_fid_put(fid);
758 p9_fid_put(dfid);
759 return err;
760 }
761
762 /**
763 * v9fs_vfs_link_dotl - create a hardlink for dotl
764 * @old_dentry: dentry for file to link to
765 * @dir: inode destination for new link
766 * @dentry: dentry for link
767 *
768 */
769
770 static int
v9fs_vfs_link_dotl(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)771 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
772 struct dentry *dentry)
773 {
774 int err;
775 struct p9_fid *dfid, *oldfid;
776 struct v9fs_session_info *v9ses;
777
778 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
779 dir->i_ino, old_dentry, dentry);
780
781 v9ses = v9fs_inode2v9ses(dir);
782 dfid = v9fs_parent_fid(dentry);
783 if (IS_ERR(dfid))
784 return PTR_ERR(dfid);
785
786 oldfid = v9fs_fid_lookup(old_dentry);
787 if (IS_ERR(oldfid)) {
788 p9_fid_put(dfid);
789 return PTR_ERR(oldfid);
790 }
791
792 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
793
794 p9_fid_put(dfid);
795 p9_fid_put(oldfid);
796 if (err < 0) {
797 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
798 return err;
799 }
800
801 v9fs_invalidate_inode_attr(dir);
802 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
803 /* Get the latest stat info from server. */
804 struct p9_fid *fid;
805
806 fid = v9fs_fid_lookup(old_dentry);
807 if (IS_ERR(fid))
808 return PTR_ERR(fid);
809
810 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
811 p9_fid_put(fid);
812 }
813 ihold(d_inode(old_dentry));
814 d_instantiate(dentry, d_inode(old_dentry));
815
816 return err;
817 }
818
819 /**
820 * v9fs_vfs_mknod_dotl - create a special file
821 * @mnt_userns: The user namespace of the mount
822 * @dir: inode destination for new link
823 * @dentry: dentry for file
824 * @omode: mode for creation
825 * @rdev: device associated with special file
826 *
827 */
828 static int
v9fs_vfs_mknod_dotl(struct user_namespace * mnt_userns,struct inode * dir,struct dentry * dentry,umode_t omode,dev_t rdev)829 v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
830 struct dentry *dentry, umode_t omode, dev_t rdev)
831 {
832 int err;
833 kgid_t gid;
834 const unsigned char *name;
835 umode_t mode;
836 struct v9fs_session_info *v9ses;
837 struct p9_fid *fid = NULL, *dfid = NULL;
838 struct inode *inode;
839 struct p9_qid qid;
840 struct posix_acl *dacl = NULL, *pacl = NULL;
841
842 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
843 dir->i_ino, dentry, omode,
844 MAJOR(rdev), MINOR(rdev));
845
846 v9ses = v9fs_inode2v9ses(dir);
847 dfid = v9fs_parent_fid(dentry);
848 if (IS_ERR(dfid)) {
849 err = PTR_ERR(dfid);
850 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
851 goto error;
852 }
853
854 gid = v9fs_get_fsgid_for_create(dir);
855 mode = omode;
856 /* Update mode based on ACL value */
857 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
858 if (err) {
859 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
860 err);
861 goto error;
862 }
863 name = dentry->d_name.name;
864
865 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
866 if (err < 0)
867 goto error;
868
869 v9fs_invalidate_inode_attr(dir);
870 fid = p9_client_walk(dfid, 1, &name, 1);
871 if (IS_ERR(fid)) {
872 err = PTR_ERR(fid);
873 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
874 err);
875 goto error;
876 }
877
878 /* instantiate inode and assign the unopened fid to the dentry */
879 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
880 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
881 if (IS_ERR(inode)) {
882 err = PTR_ERR(inode);
883 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
884 err);
885 goto error;
886 }
887 v9fs_set_create_acl(inode, fid, dacl, pacl);
888 v9fs_fid_add(dentry, &fid);
889 d_instantiate(dentry, inode);
890 err = 0;
891 } else {
892 /*
893 * Not in cached mode. No need to populate inode with stat.
894 * socket syscall returns a fd, so we need instantiate
895 */
896 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
897 if (IS_ERR(inode)) {
898 err = PTR_ERR(inode);
899 goto error;
900 }
901 v9fs_set_create_acl(inode, fid, dacl, pacl);
902 d_instantiate(dentry, inode);
903 }
904 error:
905 p9_fid_put(fid);
906 v9fs_put_acl(dacl, pacl);
907 p9_fid_put(dfid);
908
909 return err;
910 }
911
912 /**
913 * v9fs_vfs_get_link_dotl - follow a symlink path
914 * @dentry: dentry for symlink
915 * @inode: inode for symlink
916 * @done: destructor for return value
917 */
918
919 static const char *
v9fs_vfs_get_link_dotl(struct dentry * dentry,struct inode * inode,struct delayed_call * done)920 v9fs_vfs_get_link_dotl(struct dentry *dentry,
921 struct inode *inode,
922 struct delayed_call *done)
923 {
924 struct p9_fid *fid;
925 char *target;
926 int retval;
927
928 if (!dentry)
929 return ERR_PTR(-ECHILD);
930
931 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
932
933 fid = v9fs_fid_lookup(dentry);
934 if (IS_ERR(fid))
935 return ERR_CAST(fid);
936 retval = p9_client_readlink(fid, &target);
937 p9_fid_put(fid);
938 if (retval)
939 return ERR_PTR(retval);
940 set_delayed_call(done, kfree_link, target);
941 return target;
942 }
943
v9fs_refresh_inode_dotl(struct p9_fid * fid,struct inode * inode)944 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
945 {
946 struct p9_stat_dotl *st;
947 struct v9fs_session_info *v9ses;
948 unsigned int flags;
949
950 v9ses = v9fs_inode2v9ses(inode);
951 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
952 if (IS_ERR(st))
953 return PTR_ERR(st);
954 /*
955 * Don't update inode if the file type is different
956 */
957 if (inode_wrong_type(inode, st->st_mode))
958 goto out;
959
960 /*
961 * We don't want to refresh inode->i_size,
962 * because we may have cached data
963 */
964 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
965 V9FS_STAT2INODE_KEEP_ISIZE : 0;
966 v9fs_stat2inode_dotl(st, inode, flags);
967 out:
968 kfree(st);
969 return 0;
970 }
971
972 const struct inode_operations v9fs_dir_inode_operations_dotl = {
973 .create = v9fs_vfs_create_dotl,
974 .atomic_open = v9fs_vfs_atomic_open_dotl,
975 .lookup = v9fs_vfs_lookup,
976 .link = v9fs_vfs_link_dotl,
977 .symlink = v9fs_vfs_symlink_dotl,
978 .unlink = v9fs_vfs_unlink,
979 .mkdir = v9fs_vfs_mkdir_dotl,
980 .rmdir = v9fs_vfs_rmdir,
981 .mknod = v9fs_vfs_mknod_dotl,
982 .rename = v9fs_vfs_rename,
983 .getattr = v9fs_vfs_getattr_dotl,
984 .setattr = v9fs_vfs_setattr_dotl,
985 .listxattr = v9fs_listxattr,
986 .get_acl = v9fs_iop_get_acl,
987 };
988
989 const struct inode_operations v9fs_file_inode_operations_dotl = {
990 .getattr = v9fs_vfs_getattr_dotl,
991 .setattr = v9fs_vfs_setattr_dotl,
992 .listxattr = v9fs_listxattr,
993 .get_acl = v9fs_iop_get_acl,
994 };
995
996 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
997 .get_link = v9fs_vfs_get_link_dotl,
998 .getattr = v9fs_vfs_getattr_dotl,
999 .setattr = v9fs_vfs_setattr_dotl,
1000 .listxattr = v9fs_listxattr,
1001 };
1002