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
v9fs_test_inode_dotl(struct inode * inode,void * data)55 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
56 {
57 struct v9fs_inode *v9inode = V9FS_I(inode);
58 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
59
60 /* don't match inode of different type */
61 if (inode_wrong_type(inode, st->st_mode))
62 return 0;
63
64 if (inode->i_generation != st->st_gen)
65 return 0;
66
67 /* compare qid details */
68 if (memcmp(&v9inode->qid.version,
69 &st->qid.version, sizeof(v9inode->qid.version)))
70 return 0;
71
72 if (v9inode->qid.type != st->qid.type)
73 return 0;
74
75 if (v9inode->qid.path != st->qid.path)
76 return 0;
77 return 1;
78 }
79
80 /* Always get a new inode */
v9fs_test_new_inode_dotl(struct inode * inode,void * data)81 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
82 {
83 return 0;
84 }
85
v9fs_set_inode_dotl(struct inode * inode,void * data)86 static int v9fs_set_inode_dotl(struct inode *inode, void *data)
87 {
88 struct v9fs_inode *v9inode = V9FS_I(inode);
89 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
90
91 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
92 inode->i_generation = st->st_gen;
93 return 0;
94 }
95
v9fs_qid_iget_dotl(struct super_block * sb,struct p9_qid * qid,struct p9_fid * fid,struct p9_stat_dotl * st,int new)96 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
97 struct p9_qid *qid,
98 struct p9_fid *fid,
99 struct p9_stat_dotl *st,
100 int new)
101 {
102 int retval;
103 unsigned long i_ino;
104 struct inode *inode;
105 struct v9fs_session_info *v9ses = sb->s_fs_info;
106 int (*test)(struct inode *inode, void *data);
107
108 if (new)
109 test = v9fs_test_new_inode_dotl;
110 else
111 test = v9fs_test_inode_dotl;
112
113 i_ino = v9fs_qid2ino(qid);
114 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
115 if (!inode)
116 return ERR_PTR(-ENOMEM);
117 if (!(inode->i_state & I_NEW))
118 return inode;
119 /*
120 * initialize the inode with the stat info
121 * FIXME!! we may need support for stale inodes
122 * later.
123 */
124 inode->i_ino = i_ino;
125 retval = v9fs_init_inode(v9ses, inode,
126 st->st_mode, new_decode_dev(st->st_rdev));
127 if (retval)
128 goto error;
129
130 v9fs_stat2inode_dotl(st, inode, 0);
131 v9fs_cache_inode_get_cookie(inode);
132 retval = v9fs_get_acl(inode, fid);
133 if (retval)
134 goto error;
135
136 unlock_new_inode(inode);
137 return inode;
138 error:
139 iget_failed(inode);
140 return ERR_PTR(retval);
141
142 }
143
144 struct inode *
v9fs_inode_from_fid_dotl(struct v9fs_session_info * v9ses,struct p9_fid * fid,struct super_block * sb,int new)145 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
146 struct super_block *sb, int new)
147 {
148 struct p9_stat_dotl *st;
149 struct inode *inode = NULL;
150
151 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
152 if (IS_ERR(st))
153 return ERR_CAST(st);
154
155 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
156 kfree(st);
157 return inode;
158 }
159
160 struct dotl_openflag_map {
161 int open_flag;
162 int dotl_flag;
163 };
164
v9fs_mapped_dotl_flags(int flags)165 static int v9fs_mapped_dotl_flags(int flags)
166 {
167 int i;
168 int rflags = 0;
169 struct dotl_openflag_map dotl_oflag_map[] = {
170 { O_CREAT, P9_DOTL_CREATE },
171 { O_EXCL, P9_DOTL_EXCL },
172 { O_NOCTTY, P9_DOTL_NOCTTY },
173 { O_APPEND, P9_DOTL_APPEND },
174 { O_NONBLOCK, P9_DOTL_NONBLOCK },
175 { O_DSYNC, P9_DOTL_DSYNC },
176 { FASYNC, P9_DOTL_FASYNC },
177 { O_DIRECT, P9_DOTL_DIRECT },
178 { O_LARGEFILE, P9_DOTL_LARGEFILE },
179 { O_DIRECTORY, P9_DOTL_DIRECTORY },
180 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
181 { O_NOATIME, P9_DOTL_NOATIME },
182 { O_CLOEXEC, P9_DOTL_CLOEXEC },
183 { O_SYNC, P9_DOTL_SYNC},
184 };
185 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
186 if (flags & dotl_oflag_map[i].open_flag)
187 rflags |= dotl_oflag_map[i].dotl_flag;
188 }
189 return rflags;
190 }
191
192 /**
193 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
194 * plan 9 open flag.
195 * @flags: flags to convert
196 */
v9fs_open_to_dotl_flags(int flags)197 int v9fs_open_to_dotl_flags(int flags)
198 {
199 int rflags = 0;
200
201 /*
202 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
203 * and P9_DOTL_NOACCESS
204 */
205 rflags |= flags & O_ACCMODE;
206 rflags |= v9fs_mapped_dotl_flags(flags);
207
208 return rflags;
209 }
210
211 /**
212 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
213 * @idmap: The user namespace of the mount
214 * @dir: directory inode that is being created
215 * @dentry: dentry that is being deleted
216 * @omode: create permissions
217 * @excl: True if the file must not yet exist
218 *
219 */
220 static int
v9fs_vfs_create_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t omode,bool excl)221 v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir,
222 struct dentry *dentry, umode_t omode, bool excl)
223 {
224 return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0);
225 }
226
227 static int
v9fs_vfs_atomic_open_dotl(struct inode * dir,struct dentry * dentry,struct file * file,unsigned int flags,umode_t omode)228 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
229 struct file *file, unsigned int flags, umode_t omode)
230 {
231 int err = 0;
232 kgid_t gid;
233 umode_t mode;
234 int p9_omode = v9fs_open_to_dotl_flags(flags);
235 const unsigned char *name = NULL;
236 struct p9_qid qid;
237 struct inode *inode;
238 struct p9_fid *fid = NULL;
239 struct p9_fid *dfid = NULL, *ofid = NULL;
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%x\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 create %d\n",
285 err);
286 goto out;
287 }
288
289 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
290 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
291 p9_debug(P9_DEBUG_CACHE,
292 "write-only file with writeback enabled, creating w/ O_RDWR\n");
293 }
294 err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid);
295 if (err < 0) {
296 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n",
297 err);
298 goto out;
299 }
300 v9fs_invalidate_inode_attr(dir);
301
302 /* instantiate inode and assign the unopened fid to the dentry */
303 fid = p9_client_walk(dfid, 1, &name, 1);
304 if (IS_ERR(fid)) {
305 err = PTR_ERR(fid);
306 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
307 goto out;
308 }
309 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
310 if (IS_ERR(inode)) {
311 err = PTR_ERR(inode);
312 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
313 goto out;
314 }
315 /* Now set the ACL based on the default value */
316 v9fs_set_create_acl(inode, fid, dacl, pacl);
317
318 v9fs_fid_add(dentry, &fid);
319 d_instantiate(dentry, inode);
320
321 /* Since we are opening a file, assign the open fid to the file */
322 err = finish_open(file, dentry, generic_file_open);
323 if (err)
324 goto out;
325 file->private_data = ofid;
326 #ifdef CONFIG_9P_FSCACHE
327 if (v9ses->cache & CACHE_FSCACHE) {
328 struct v9fs_inode *v9inode = V9FS_I(inode);
329 fscache_use_cookie(v9fs_inode_cookie(v9inode),
330 file->f_mode & FMODE_WRITE);
331 }
332 #endif
333 v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags);
334 v9fs_open_fid_add(inode, &ofid);
335 file->f_mode |= FMODE_CREATED;
336 out:
337 p9_fid_put(dfid);
338 p9_fid_put(ofid);
339 p9_fid_put(fid);
340 v9fs_put_acl(dacl, pacl);
341 dput(res);
342 return err;
343 }
344
345 /**
346 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
347 * @idmap: The idmap of the mount
348 * @dir: inode that is being unlinked
349 * @dentry: dentry that is being unlinked
350 * @omode: mode for new directory
351 *
352 */
353
v9fs_vfs_mkdir_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t omode)354 static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
355 struct inode *dir, struct dentry *dentry,
356 umode_t omode)
357 {
358 int err;
359 struct v9fs_session_info *v9ses;
360 struct p9_fid *fid = NULL, *dfid = NULL;
361 kgid_t gid;
362 const unsigned char *name;
363 umode_t mode;
364 struct inode *inode;
365 struct p9_qid qid;
366 struct posix_acl *dacl = NULL, *pacl = NULL;
367
368 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
369 v9ses = v9fs_inode2v9ses(dir);
370
371 omode |= S_IFDIR;
372 if (dir->i_mode & S_ISGID)
373 omode |= S_ISGID;
374
375 dfid = v9fs_parent_fid(dentry);
376 if (IS_ERR(dfid)) {
377 err = PTR_ERR(dfid);
378 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
379 goto error;
380 }
381
382 gid = v9fs_get_fsgid_for_create(dir);
383 mode = omode;
384 /* Update mode based on ACL value */
385 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
386 if (err) {
387 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
388 err);
389 goto error;
390 }
391 name = dentry->d_name.name;
392 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
393 if (err < 0)
394 goto error;
395 fid = p9_client_walk(dfid, 1, &name, 1);
396 if (IS_ERR(fid)) {
397 err = PTR_ERR(fid);
398 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
399 err);
400 goto error;
401 }
402
403 /* instantiate inode and assign the unopened fid to the dentry */
404 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
405 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
406 if (IS_ERR(inode)) {
407 err = PTR_ERR(inode);
408 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
409 err);
410 goto error;
411 }
412 v9fs_fid_add(dentry, &fid);
413 v9fs_set_create_acl(inode, fid, dacl, pacl);
414 d_instantiate(dentry, inode);
415 err = 0;
416 } else {
417 /*
418 * Not in cached mode. No need to populate
419 * inode with stat. We need to get an inode
420 * so that we can set the acl with dentry
421 */
422 inode = v9fs_get_inode(dir->i_sb, mode, 0);
423 if (IS_ERR(inode)) {
424 err = PTR_ERR(inode);
425 goto error;
426 }
427 v9fs_set_create_acl(inode, fid, dacl, pacl);
428 d_instantiate(dentry, inode);
429 }
430 inc_nlink(dir);
431 v9fs_invalidate_inode_attr(dir);
432 error:
433 p9_fid_put(fid);
434 v9fs_put_acl(dacl, pacl);
435 p9_fid_put(dfid);
436 return err;
437 }
438
439 static int
v9fs_vfs_getattr_dotl(struct mnt_idmap * idmap,const struct path * path,struct kstat * stat,u32 request_mask,unsigned int flags)440 v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap,
441 const struct path *path, struct kstat *stat,
442 u32 request_mask, unsigned int flags)
443 {
444 struct dentry *dentry = path->dentry;
445 struct v9fs_session_info *v9ses;
446 struct p9_fid *fid;
447 struct inode *inode = d_inode(dentry);
448 struct p9_stat_dotl *st;
449
450 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
451 v9ses = v9fs_dentry2v9ses(dentry);
452 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
453 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
454 return 0;
455 } else if (v9ses->cache) {
456 if (S_ISREG(inode->i_mode)) {
457 int retval = filemap_fdatawrite(inode->i_mapping);
458
459 if (retval)
460 p9_debug(P9_DEBUG_ERROR,
461 "flushing writeback during getattr returned %d\n", retval);
462 }
463 }
464 fid = v9fs_fid_lookup(dentry);
465 if (IS_ERR(fid))
466 return PTR_ERR(fid);
467
468 /* Ask for all the fields in stat structure. Server will return
469 * whatever it supports
470 */
471
472 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
473 p9_fid_put(fid);
474 if (IS_ERR(st))
475 return PTR_ERR(st);
476
477 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
478 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
479 /* Change block size to what the server returned */
480 stat->blksize = st->st_blksize;
481
482 kfree(st);
483 return 0;
484 }
485
486 /*
487 * Attribute flags.
488 */
489 #define P9_ATTR_MODE (1 << 0)
490 #define P9_ATTR_UID (1 << 1)
491 #define P9_ATTR_GID (1 << 2)
492 #define P9_ATTR_SIZE (1 << 3)
493 #define P9_ATTR_ATIME (1 << 4)
494 #define P9_ATTR_MTIME (1 << 5)
495 #define P9_ATTR_CTIME (1 << 6)
496 #define P9_ATTR_ATIME_SET (1 << 7)
497 #define P9_ATTR_MTIME_SET (1 << 8)
498
499 struct dotl_iattr_map {
500 int iattr_valid;
501 int p9_iattr_valid;
502 };
503
v9fs_mapped_iattr_valid(int iattr_valid)504 static int v9fs_mapped_iattr_valid(int iattr_valid)
505 {
506 int i;
507 int p9_iattr_valid = 0;
508 struct dotl_iattr_map dotl_iattr_map[] = {
509 { ATTR_MODE, P9_ATTR_MODE },
510 { ATTR_UID, P9_ATTR_UID },
511 { ATTR_GID, P9_ATTR_GID },
512 { ATTR_SIZE, P9_ATTR_SIZE },
513 { ATTR_ATIME, P9_ATTR_ATIME },
514 { ATTR_MTIME, P9_ATTR_MTIME },
515 { ATTR_CTIME, P9_ATTR_CTIME },
516 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
517 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
518 };
519 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
520 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
521 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
522 }
523 return p9_iattr_valid;
524 }
525
526 /**
527 * v9fs_vfs_setattr_dotl - set file metadata
528 * @idmap: idmap of the mount
529 * @dentry: file whose metadata to set
530 * @iattr: metadata assignment structure
531 *
532 */
533
v9fs_vfs_setattr_dotl(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * iattr)534 int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
535 struct dentry *dentry, struct iattr *iattr)
536 {
537 int retval, use_dentry = 0;
538 struct inode *inode = d_inode(dentry);
539 struct v9fs_session_info __maybe_unused *v9ses;
540 struct p9_fid *fid = NULL;
541 struct p9_iattr_dotl p9attr = {
542 .uid = INVALID_UID,
543 .gid = INVALID_GID,
544 };
545
546 p9_debug(P9_DEBUG_VFS, "\n");
547
548 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
549 if (retval)
550 return retval;
551
552 v9ses = v9fs_dentry2v9ses(dentry);
553
554 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
555 if (iattr->ia_valid & ATTR_MODE)
556 p9attr.mode = iattr->ia_mode;
557 if (iattr->ia_valid & ATTR_UID)
558 p9attr.uid = iattr->ia_uid;
559 if (iattr->ia_valid & ATTR_GID)
560 p9attr.gid = iattr->ia_gid;
561 if (iattr->ia_valid & ATTR_SIZE)
562 p9attr.size = iattr->ia_size;
563 if (iattr->ia_valid & ATTR_ATIME_SET) {
564 p9attr.atime_sec = iattr->ia_atime.tv_sec;
565 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
566 }
567 if (iattr->ia_valid & ATTR_MTIME_SET) {
568 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
569 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
570 }
571
572 if (iattr->ia_valid & ATTR_FILE) {
573 fid = iattr->ia_file->private_data;
574 WARN_ON(!fid);
575 }
576 if (!fid) {
577 fid = v9fs_fid_lookup(dentry);
578 use_dentry = 1;
579 }
580 if (IS_ERR(fid))
581 return PTR_ERR(fid);
582
583 /* Write all dirty data */
584 if (S_ISREG(inode->i_mode)) {
585 retval = filemap_fdatawrite(inode->i_mapping);
586 if (retval < 0)
587 p9_debug(P9_DEBUG_ERROR,
588 "Flushing file prior to setattr failed: %d\n", retval);
589 }
590
591 retval = p9_client_setattr(fid, &p9attr);
592 if (retval < 0) {
593 if (use_dentry)
594 p9_fid_put(fid);
595 return retval;
596 }
597
598 if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size !=
599 i_size_read(inode)) {
600 truncate_setsize(inode, iattr->ia_size);
601 truncate_pagecache(inode, iattr->ia_size);
602
603 #ifdef CONFIG_9P_FSCACHE
604 if (v9ses->cache & CACHE_FSCACHE)
605 fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)),
606 iattr->ia_size);
607 #endif
608 }
609
610 v9fs_invalidate_inode_attr(inode);
611 setattr_copy(&nop_mnt_idmap, inode, iattr);
612 mark_inode_dirty(inode);
613 if (iattr->ia_valid & ATTR_MODE) {
614 /* We also want to update ACL when we update mode bits */
615 retval = v9fs_acl_chmod(inode, fid);
616 if (retval < 0) {
617 if (use_dentry)
618 p9_fid_put(fid);
619 return retval;
620 }
621 }
622 if (use_dentry)
623 p9_fid_put(fid);
624
625 return 0;
626 }
627
628 /**
629 * v9fs_stat2inode_dotl - populate an inode structure with stat info
630 * @stat: stat structure
631 * @inode: inode to populate
632 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
633 *
634 */
635
636 void
v9fs_stat2inode_dotl(struct p9_stat_dotl * stat,struct inode * inode,unsigned int flags)637 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
638 unsigned int flags)
639 {
640 umode_t mode;
641 struct v9fs_inode *v9inode = V9FS_I(inode);
642
643 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
644 inode->i_atime.tv_sec = stat->st_atime_sec;
645 inode->i_atime.tv_nsec = stat->st_atime_nsec;
646 inode->i_mtime.tv_sec = stat->st_mtime_sec;
647 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
648 inode_set_ctime(inode, stat->st_ctime_sec,
649 stat->st_ctime_nsec);
650 inode->i_uid = stat->st_uid;
651 inode->i_gid = stat->st_gid;
652 set_nlink(inode, stat->st_nlink);
653
654 mode = stat->st_mode & S_IALLUGO;
655 mode |= inode->i_mode & ~S_IALLUGO;
656 inode->i_mode = mode;
657
658 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
659 v9fs_i_size_write(inode, stat->st_size);
660 inode->i_blocks = stat->st_blocks;
661 } else {
662 if (stat->st_result_mask & P9_STATS_ATIME) {
663 inode->i_atime.tv_sec = stat->st_atime_sec;
664 inode->i_atime.tv_nsec = stat->st_atime_nsec;
665 }
666 if (stat->st_result_mask & P9_STATS_MTIME) {
667 inode->i_mtime.tv_sec = stat->st_mtime_sec;
668 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
669 }
670 if (stat->st_result_mask & P9_STATS_CTIME) {
671 inode_set_ctime(inode, stat->st_ctime_sec,
672 stat->st_ctime_nsec);
673 }
674 if (stat->st_result_mask & P9_STATS_UID)
675 inode->i_uid = stat->st_uid;
676 if (stat->st_result_mask & P9_STATS_GID)
677 inode->i_gid = stat->st_gid;
678 if (stat->st_result_mask & P9_STATS_NLINK)
679 set_nlink(inode, stat->st_nlink);
680 if (stat->st_result_mask & P9_STATS_MODE) {
681 mode = stat->st_mode & S_IALLUGO;
682 mode |= inode->i_mode & ~S_IALLUGO;
683 inode->i_mode = mode;
684 }
685 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
686 stat->st_result_mask & P9_STATS_SIZE)
687 v9fs_i_size_write(inode, stat->st_size);
688 if (stat->st_result_mask & P9_STATS_BLOCKS)
689 inode->i_blocks = stat->st_blocks;
690 }
691 if (stat->st_result_mask & P9_STATS_GEN)
692 inode->i_generation = stat->st_gen;
693
694 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
695 * because the inode structure does not have fields for them.
696 */
697 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
698 }
699
700 static int
v9fs_vfs_symlink_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,const char * symname)701 v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir,
702 struct dentry *dentry, const char *symname)
703 {
704 int err;
705 kgid_t gid;
706 const unsigned char *name;
707 struct p9_qid qid;
708 struct inode *inode;
709 struct p9_fid *dfid;
710 struct p9_fid *fid = NULL;
711 struct v9fs_session_info *v9ses;
712
713 name = dentry->d_name.name;
714 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
715 v9ses = v9fs_inode2v9ses(dir);
716
717 dfid = v9fs_parent_fid(dentry);
718 if (IS_ERR(dfid)) {
719 err = PTR_ERR(dfid);
720 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
721 return err;
722 }
723
724 gid = v9fs_get_fsgid_for_create(dir);
725
726 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
727 err = p9_client_symlink(dfid, name, symname, gid, &qid);
728
729 if (err < 0) {
730 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
731 goto error;
732 }
733
734 v9fs_invalidate_inode_attr(dir);
735 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
736 /* Now walk from the parent so we can get an unopened fid. */
737 fid = p9_client_walk(dfid, 1, &name, 1);
738 if (IS_ERR(fid)) {
739 err = PTR_ERR(fid);
740 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
741 err);
742 goto error;
743 }
744
745 /* instantiate inode and assign the unopened fid to dentry */
746 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
747 if (IS_ERR(inode)) {
748 err = PTR_ERR(inode);
749 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
750 err);
751 goto error;
752 }
753 v9fs_fid_add(dentry, &fid);
754 d_instantiate(dentry, inode);
755 err = 0;
756 } else {
757 /* Not in cached mode. No need to populate inode with stat */
758 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
759 if (IS_ERR(inode)) {
760 err = PTR_ERR(inode);
761 goto error;
762 }
763 d_instantiate(dentry, inode);
764 }
765
766 error:
767 p9_fid_put(fid);
768 p9_fid_put(dfid);
769 return err;
770 }
771
772 /**
773 * v9fs_vfs_link_dotl - create a hardlink for dotl
774 * @old_dentry: dentry for file to link to
775 * @dir: inode destination for new link
776 * @dentry: dentry for link
777 *
778 */
779
780 static int
v9fs_vfs_link_dotl(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)781 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
782 struct dentry *dentry)
783 {
784 int err;
785 struct p9_fid *dfid, *oldfid;
786 struct v9fs_session_info *v9ses;
787
788 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
789 dir->i_ino, old_dentry, dentry);
790
791 v9ses = v9fs_inode2v9ses(dir);
792 dfid = v9fs_parent_fid(dentry);
793 if (IS_ERR(dfid))
794 return PTR_ERR(dfid);
795
796 oldfid = v9fs_fid_lookup(old_dentry);
797 if (IS_ERR(oldfid)) {
798 p9_fid_put(dfid);
799 return PTR_ERR(oldfid);
800 }
801
802 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
803
804 p9_fid_put(dfid);
805 p9_fid_put(oldfid);
806 if (err < 0) {
807 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
808 return err;
809 }
810
811 v9fs_invalidate_inode_attr(dir);
812 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
813 /* Get the latest stat info from server. */
814 struct p9_fid *fid;
815
816 fid = v9fs_fid_lookup(old_dentry);
817 if (IS_ERR(fid))
818 return PTR_ERR(fid);
819
820 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
821 p9_fid_put(fid);
822 }
823 ihold(d_inode(old_dentry));
824 d_instantiate(dentry, d_inode(old_dentry));
825
826 return err;
827 }
828
829 /**
830 * v9fs_vfs_mknod_dotl - create a special file
831 * @idmap: The idmap of the mount
832 * @dir: inode destination for new link
833 * @dentry: dentry for file
834 * @omode: mode for creation
835 * @rdev: device associated with special file
836 *
837 */
838 static int
v9fs_vfs_mknod_dotl(struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t omode,dev_t rdev)839 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
840 struct dentry *dentry, umode_t omode, dev_t rdev)
841 {
842 int err;
843 kgid_t gid;
844 const unsigned char *name;
845 umode_t mode;
846 struct v9fs_session_info *v9ses;
847 struct p9_fid *fid = NULL, *dfid = NULL;
848 struct inode *inode;
849 struct p9_qid qid;
850 struct posix_acl *dacl = NULL, *pacl = NULL;
851
852 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
853 dir->i_ino, dentry, omode,
854 MAJOR(rdev), MINOR(rdev));
855
856 v9ses = v9fs_inode2v9ses(dir);
857 dfid = v9fs_parent_fid(dentry);
858 if (IS_ERR(dfid)) {
859 err = PTR_ERR(dfid);
860 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
861 goto error;
862 }
863
864 gid = v9fs_get_fsgid_for_create(dir);
865 mode = omode;
866 /* Update mode based on ACL value */
867 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
868 if (err) {
869 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
870 err);
871 goto error;
872 }
873 name = dentry->d_name.name;
874
875 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
876 if (err < 0)
877 goto error;
878
879 v9fs_invalidate_inode_attr(dir);
880 fid = p9_client_walk(dfid, 1, &name, 1);
881 if (IS_ERR(fid)) {
882 err = PTR_ERR(fid);
883 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
884 err);
885 goto error;
886 }
887
888 /* instantiate inode and assign the unopened fid to the dentry */
889 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
890 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
891 if (IS_ERR(inode)) {
892 err = PTR_ERR(inode);
893 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
894 err);
895 goto error;
896 }
897 v9fs_set_create_acl(inode, fid, dacl, pacl);
898 v9fs_fid_add(dentry, &fid);
899 d_instantiate(dentry, inode);
900 err = 0;
901 } else {
902 /*
903 * Not in cached mode. No need to populate inode with stat.
904 * socket syscall returns a fd, so we need instantiate
905 */
906 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
907 if (IS_ERR(inode)) {
908 err = PTR_ERR(inode);
909 goto error;
910 }
911 v9fs_set_create_acl(inode, fid, dacl, pacl);
912 d_instantiate(dentry, inode);
913 }
914 error:
915 p9_fid_put(fid);
916 v9fs_put_acl(dacl, pacl);
917 p9_fid_put(dfid);
918
919 return err;
920 }
921
922 /**
923 * v9fs_vfs_get_link_dotl - follow a symlink path
924 * @dentry: dentry for symlink
925 * @inode: inode for symlink
926 * @done: destructor for return value
927 */
928
929 static const char *
v9fs_vfs_get_link_dotl(struct dentry * dentry,struct inode * inode,struct delayed_call * done)930 v9fs_vfs_get_link_dotl(struct dentry *dentry,
931 struct inode *inode,
932 struct delayed_call *done)
933 {
934 struct p9_fid *fid;
935 char *target;
936 int retval;
937
938 if (!dentry)
939 return ERR_PTR(-ECHILD);
940
941 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
942
943 fid = v9fs_fid_lookup(dentry);
944 if (IS_ERR(fid))
945 return ERR_CAST(fid);
946 retval = p9_client_readlink(fid, &target);
947 p9_fid_put(fid);
948 if (retval)
949 return ERR_PTR(retval);
950 set_delayed_call(done, kfree_link, target);
951 return target;
952 }
953
v9fs_refresh_inode_dotl(struct p9_fid * fid,struct inode * inode)954 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
955 {
956 struct p9_stat_dotl *st;
957 struct v9fs_session_info *v9ses;
958 unsigned int flags;
959
960 v9ses = v9fs_inode2v9ses(inode);
961 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
962 if (IS_ERR(st))
963 return PTR_ERR(st);
964 /*
965 * Don't update inode if the file type is different
966 */
967 if (inode_wrong_type(inode, st->st_mode))
968 goto out;
969
970 /*
971 * We don't want to refresh inode->i_size,
972 * because we may have cached data
973 */
974 flags = (v9ses->cache & CACHE_LOOSE) ?
975 V9FS_STAT2INODE_KEEP_ISIZE : 0;
976 v9fs_stat2inode_dotl(st, inode, flags);
977 out:
978 kfree(st);
979 return 0;
980 }
981
982 const struct inode_operations v9fs_dir_inode_operations_dotl = {
983 .create = v9fs_vfs_create_dotl,
984 .atomic_open = v9fs_vfs_atomic_open_dotl,
985 .lookup = v9fs_vfs_lookup,
986 .link = v9fs_vfs_link_dotl,
987 .symlink = v9fs_vfs_symlink_dotl,
988 .unlink = v9fs_vfs_unlink,
989 .mkdir = v9fs_vfs_mkdir_dotl,
990 .rmdir = v9fs_vfs_rmdir,
991 .mknod = v9fs_vfs_mknod_dotl,
992 .rename = v9fs_vfs_rename,
993 .getattr = v9fs_vfs_getattr_dotl,
994 .setattr = v9fs_vfs_setattr_dotl,
995 .listxattr = v9fs_listxattr,
996 .get_inode_acl = v9fs_iop_get_inode_acl,
997 .get_acl = v9fs_iop_get_acl,
998 .set_acl = v9fs_iop_set_acl,
999 };
1000
1001 const struct inode_operations v9fs_file_inode_operations_dotl = {
1002 .getattr = v9fs_vfs_getattr_dotl,
1003 .setattr = v9fs_vfs_setattr_dotl,
1004 .listxattr = v9fs_listxattr,
1005 .get_inode_acl = v9fs_iop_get_inode_acl,
1006 .get_acl = v9fs_iop_get_acl,
1007 .set_acl = v9fs_iop_set_acl,
1008 };
1009
1010 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1011 .get_link = v9fs_vfs_get_link_dotl,
1012 .getattr = v9fs_vfs_getattr_dotl,
1013 .setattr = v9fs_vfs_setattr_dotl,
1014 .listxattr = v9fs_listxattr,
1015 };
1016
