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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
50static int
51v9fs_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
60static 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
71static 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 return 1;
91}
92
93/* Always get a new inode */
94static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
95{
96 return 0;
97}
98
99static int v9fs_set_inode_dotl(struct inode *inode, void *data)
100{
101 struct v9fs_inode *v9inode = V9FS_I(inode);
102 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
103
104 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
105 inode->i_generation = st->st_gen;
106 return 0;
107}
108
109static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
110 struct p9_qid *qid,
111 struct p9_fid *fid,
112 struct p9_stat_dotl *st,
113 int new)
114{
115 int retval;
116 unsigned long i_ino;
117 struct inode *inode;
118 struct v9fs_session_info *v9ses = sb->s_fs_info;
119 int (*test)(struct inode *, void *);
120
121 if (new)
122 test = v9fs_test_new_inode_dotl;
123 else
124 test = v9fs_test_inode_dotl;
125
126 i_ino = v9fs_qid2ino(qid);
127 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
128 if (!inode)
129 return ERR_PTR(-ENOMEM);
130 if (!(inode->i_state & I_NEW))
131 return inode;
132 /*
133 * initialize the inode with the stat info
134 * FIXME!! we may need support for stale inodes
135 * later.
136 */
137 inode->i_ino = i_ino;
138 retval = v9fs_init_inode(v9ses, inode,
139 st->st_mode, new_decode_dev(st->st_rdev));
140 if (retval)
141 goto error;
142
143 v9fs_stat2inode_dotl(st, inode);
144 v9fs_cache_inode_get_cookie(inode);
145 retval = v9fs_get_acl(inode, fid);
146 if (retval)
147 goto error;
148
149 unlock_new_inode(inode);
150 return inode;
151error:
152 iget_failed(inode);
153 return ERR_PTR(retval);
154
155}
156
157struct inode *
158v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
159 struct super_block *sb, int new)
160{
161 struct p9_stat_dotl *st;
162 struct inode *inode = NULL;
163
164 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
165 if (IS_ERR(st))
166 return ERR_CAST(st);
167
168 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
169 kfree(st);
170 return inode;
171}
172
173struct dotl_openflag_map {
174 int open_flag;
175 int dotl_flag;
176};
177
178static int v9fs_mapped_dotl_flags(int flags)
179{
180 int i;
181 int rflags = 0;
182 struct dotl_openflag_map dotl_oflag_map[] = {
183 { O_CREAT, P9_DOTL_CREATE },
184 { O_EXCL, P9_DOTL_EXCL },
185 { O_NOCTTY, P9_DOTL_NOCTTY },
186 { O_APPEND, P9_DOTL_APPEND },
187 { O_NONBLOCK, P9_DOTL_NONBLOCK },
188 { O_DSYNC, P9_DOTL_DSYNC },
189 { FASYNC, P9_DOTL_FASYNC },
190 { O_DIRECT, P9_DOTL_DIRECT },
191 { O_LARGEFILE, P9_DOTL_LARGEFILE },
192 { O_DIRECTORY, P9_DOTL_DIRECTORY },
193 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
194 { O_NOATIME, P9_DOTL_NOATIME },
195 { O_CLOEXEC, P9_DOTL_CLOEXEC },
196 { O_SYNC, P9_DOTL_SYNC},
197 };
198 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
199 if (flags & dotl_oflag_map[i].open_flag)
200 rflags |= dotl_oflag_map[i].dotl_flag;
201 }
202 return rflags;
203}
204
205/**
206 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
207 * plan 9 open flag.
208 * @flags: flags to convert
209 */
210int v9fs_open_to_dotl_flags(int flags)
211{
212 int rflags = 0;
213
214 /*
215 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
216 * and P9_DOTL_NOACCESS
217 */
218 rflags |= flags & O_ACCMODE;
219 rflags |= v9fs_mapped_dotl_flags(flags);
220
221 return rflags;
222}
223
224/**
225 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
226 * @dir: directory inode that is being created
227 * @dentry: dentry that is being deleted
228 * @omode: create permissions
229 *
230 */
231
232static int
233v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
234 bool excl)
235{
236 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
237}
238
239static int
240v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
241 struct file *file, unsigned flags, umode_t omode,
242 int *opened)
243{
244 int err = 0;
245 kgid_t gid;
246 umode_t mode;
247 char *name = NULL;
248 struct p9_qid qid;
249 struct inode *inode;
250 struct p9_fid *fid = NULL;
251 struct v9fs_inode *v9inode;
252 struct p9_fid *dfid, *ofid, *inode_fid;
253 struct v9fs_session_info *v9ses;
254 struct posix_acl *pacl = NULL, *dacl = NULL;
255 struct dentry *res = NULL;
256
257 if (d_unhashed(dentry)) {
258 res = v9fs_vfs_lookup(dir, dentry, 0);
259 if (IS_ERR(res))
260 return PTR_ERR(res);
261
262 if (res)
263 dentry = res;
264 }
265
266 /* Only creates */
267 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
268 return finish_no_open(file, res);
269
270 v9ses = v9fs_inode2v9ses(dir);
271
272 name = (char *) dentry->d_name.name;
273 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
274 name, flags, omode);
275
276 dfid = v9fs_fid_lookup(dentry->d_parent);
277 if (IS_ERR(dfid)) {
278 err = PTR_ERR(dfid);
279 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
280 goto out;
281 }
282
283 /* clone a fid to use for creation */
284 ofid = p9_client_walk(dfid, 0, NULL, 1);
285 if (IS_ERR(ofid)) {
286 err = PTR_ERR(ofid);
287 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
288 goto out;
289 }
290
291 gid = v9fs_get_fsgid_for_create(dir);
292
293 mode = omode;
294 /* Update mode based on ACL value */
295 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
296 if (err) {
297 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
298 err);
299 goto error;
300 }
301 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
302 mode, gid, &qid);
303 if (err < 0) {
304 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
305 err);
306 goto error;
307 }
308 v9fs_invalidate_inode_attr(dir);
309
310 /* instantiate inode and assign the unopened fid to the dentry */
311 fid = p9_client_walk(dfid, 1, &name, 1);
312 if (IS_ERR(fid)) {
313 err = PTR_ERR(fid);
314 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
315 fid = NULL;
316 goto error;
317 }
318 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
319 if (IS_ERR(inode)) {
320 err = PTR_ERR(inode);
321 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
322 goto error;
323 }
324 /* Now set the ACL based on the default value */
325 v9fs_set_create_acl(inode, fid, dacl, pacl);
326
327 v9fs_fid_add(dentry, fid);
328 d_instantiate(dentry, inode);
329
330 v9inode = V9FS_I(inode);
331 mutex_lock(&v9inode->v_mutex);
332 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
333 !v9inode->writeback_fid &&
334 ((flags & O_ACCMODE) != O_RDONLY)) {
335 /*
336 * clone a fid and add it to writeback_fid
337 * we do it during open time instead of
338 * page dirty time via write_begin/page_mkwrite
339 * because we want write after unlink usecase
340 * to work.
341 */
342 inode_fid = v9fs_writeback_fid(dentry);
343 if (IS_ERR(inode_fid)) {
344 err = PTR_ERR(inode_fid);
345 mutex_unlock(&v9inode->v_mutex);
346 goto err_clunk_old_fid;
347 }
348 v9inode->writeback_fid = (void *) inode_fid;
349 }
350 mutex_unlock(&v9inode->v_mutex);
351 /* Since we are opening a file, assign the open fid to the file */
352 err = finish_open(file, dentry, generic_file_open, opened);
353 if (err)
354 goto err_clunk_old_fid;
355 file->private_data = ofid;
356 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
357 v9fs_cache_inode_set_cookie(inode, file);
358 *opened |= FILE_CREATED;
359out:
360 v9fs_put_acl(dacl, pacl);
361 dput(res);
362 return err;
363
364error:
365 if (fid)
366 p9_client_clunk(fid);
367err_clunk_old_fid:
368 if (ofid)
369 p9_client_clunk(ofid);
370 goto out;
371}
372
373/**
374 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
375 * @dir: inode that is being unlinked
376 * @dentry: dentry that is being unlinked
377 * @omode: mode for new directory
378 *
379 */
380
381static int v9fs_vfs_mkdir_dotl(struct inode *dir,
382 struct dentry *dentry, umode_t omode)
383{
384 int err;
385 struct v9fs_session_info *v9ses;
386 struct p9_fid *fid = NULL, *dfid = NULL;
387 kgid_t gid;
388 char *name;
389 umode_t mode;
390 struct inode *inode;
391 struct p9_qid qid;
392 struct dentry *dir_dentry;
393 struct posix_acl *dacl = NULL, *pacl = NULL;
394
395 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
396 err = 0;
397 v9ses = v9fs_inode2v9ses(dir);
398
399 omode |= S_IFDIR;
400 if (dir->i_mode & S_ISGID)
401 omode |= S_ISGID;
402
403 dir_dentry = dentry->d_parent;
404 dfid = v9fs_fid_lookup(dir_dentry);
405 if (IS_ERR(dfid)) {
406 err = PTR_ERR(dfid);
407 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
408 dfid = NULL;
409 goto error;
410 }
411
412 gid = v9fs_get_fsgid_for_create(dir);
413 mode = omode;
414 /* Update mode based on ACL value */
415 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
416 if (err) {
417 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
418 err);
419 goto error;
420 }
421 name = (char *) dentry->d_name.name;
422 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
423 if (err < 0)
424 goto error;
425
426 fid = p9_client_walk(dfid, 1, &name, 1);
427 if (IS_ERR(fid)) {
428 err = PTR_ERR(fid);
429 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
430 err);
431 fid = NULL;
432 goto error;
433 }
434
435 /* instantiate inode and assign the unopened fid to the dentry */
436 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
437 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
438 if (IS_ERR(inode)) {
439 err = PTR_ERR(inode);
440 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
441 err);
442 goto error;
443 }
444 v9fs_fid_add(dentry, fid);
445 v9fs_set_create_acl(inode, fid, dacl, pacl);
446 d_instantiate(dentry, inode);
447 fid = NULL;
448 err = 0;
449 } else {
450 /*
451 * Not in cached mode. No need to populate
452 * inode with stat. We need to get an inode
453 * so that we can set the acl with dentry
454 */
455 inode = v9fs_get_inode(dir->i_sb, mode, 0);
456 if (IS_ERR(inode)) {
457 err = PTR_ERR(inode);
458 goto error;
459 }
460 v9fs_set_create_acl(inode, fid, dacl, pacl);
461 d_instantiate(dentry, inode);
462 }
463 inc_nlink(dir);
464 v9fs_invalidate_inode_attr(dir);
465error:
466 if (fid)
467 p9_client_clunk(fid);
468 v9fs_put_acl(dacl, pacl);
469 return err;
470}
471
472static int
473v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
474 struct kstat *stat)
475{
476 struct v9fs_session_info *v9ses;
477 struct p9_fid *fid;
478 struct p9_stat_dotl *st;
479
480 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
481 v9ses = v9fs_dentry2v9ses(dentry);
482 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
483 generic_fillattr(d_inode(dentry), stat);
484 return 0;
485 }
486 fid = v9fs_fid_lookup(dentry);
487 if (IS_ERR(fid))
488 return PTR_ERR(fid);
489
490 /* Ask for all the fields in stat structure. Server will return
491 * whatever it supports
492 */
493
494 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
495 if (IS_ERR(st))
496 return PTR_ERR(st);
497
498 v9fs_stat2inode_dotl(st, d_inode(dentry));
499 generic_fillattr(d_inode(dentry), stat);
500 /* Change block size to what the server returned */
501 stat->blksize = st->st_blksize;
502
503 kfree(st);
504 return 0;
505}
506
507/*
508 * Attribute flags.
509 */
510#define P9_ATTR_MODE (1 << 0)
511#define P9_ATTR_UID (1 << 1)
512#define P9_ATTR_GID (1 << 2)
513#define P9_ATTR_SIZE (1 << 3)
514#define P9_ATTR_ATIME (1 << 4)
515#define P9_ATTR_MTIME (1 << 5)
516#define P9_ATTR_CTIME (1 << 6)
517#define P9_ATTR_ATIME_SET (1 << 7)
518#define P9_ATTR_MTIME_SET (1 << 8)
519
520struct dotl_iattr_map {
521 int iattr_valid;
522 int p9_iattr_valid;
523};
524
525static int v9fs_mapped_iattr_valid(int iattr_valid)
526{
527 int i;
528 int p9_iattr_valid = 0;
529 struct dotl_iattr_map dotl_iattr_map[] = {
530 { ATTR_MODE, P9_ATTR_MODE },
531 { ATTR_UID, P9_ATTR_UID },
532 { ATTR_GID, P9_ATTR_GID },
533 { ATTR_SIZE, P9_ATTR_SIZE },
534 { ATTR_ATIME, P9_ATTR_ATIME },
535 { ATTR_MTIME, P9_ATTR_MTIME },
536 { ATTR_CTIME, P9_ATTR_CTIME },
537 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
538 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
539 };
540 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
541 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
542 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
543 }
544 return p9_iattr_valid;
545}
546
547/**
548 * v9fs_vfs_setattr_dotl - set file metadata
549 * @dentry: file whose metadata to set
550 * @iattr: metadata assignment structure
551 *
552 */
553
554int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
555{
556 int retval;
557 struct p9_fid *fid;
558 struct p9_iattr_dotl p9attr;
559 struct inode *inode = d_inode(dentry);
560
561 p9_debug(P9_DEBUG_VFS, "\n");
562
563 retval = inode_change_ok(inode, iattr);
564 if (retval)
565 return retval;
566
567 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
568 p9attr.mode = iattr->ia_mode;
569 p9attr.uid = iattr->ia_uid;
570 p9attr.gid = iattr->ia_gid;
571 p9attr.size = iattr->ia_size;
572 p9attr.atime_sec = iattr->ia_atime.tv_sec;
573 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
574 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
575 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
576
577 fid = v9fs_fid_lookup(dentry);
578 if (IS_ERR(fid))
579 return PTR_ERR(fid);
580
581 /* Write all dirty data */
582 if (S_ISREG(inode->i_mode))
583 filemap_write_and_wait(inode->i_mapping);
584
585 retval = p9_client_setattr(fid, &p9attr);
586 if (retval < 0)
587 return retval;
588
589 if ((iattr->ia_valid & ATTR_SIZE) &&
590 iattr->ia_size != i_size_read(inode))
591 truncate_setsize(inode, iattr->ia_size);
592
593 v9fs_invalidate_inode_attr(inode);
594 setattr_copy(inode, iattr);
595 mark_inode_dirty(inode);
596 if (iattr->ia_valid & ATTR_MODE) {
597 /* We also want to update ACL when we update mode bits */
598 retval = v9fs_acl_chmod(inode, fid);
599 if (retval < 0)
600 return retval;
601 }
602 return 0;
603}
604
605/**
606 * v9fs_stat2inode_dotl - populate an inode structure with stat info
607 * @stat: stat structure
608 * @inode: inode to populate
609 *
610 */
611
612void
613v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
614{
615 umode_t mode;
616 struct v9fs_inode *v9inode = V9FS_I(inode);
617
618 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
619 inode->i_atime.tv_sec = stat->st_atime_sec;
620 inode->i_atime.tv_nsec = stat->st_atime_nsec;
621 inode->i_mtime.tv_sec = stat->st_mtime_sec;
622 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
623 inode->i_ctime.tv_sec = stat->st_ctime_sec;
624 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
625 inode->i_uid = stat->st_uid;
626 inode->i_gid = stat->st_gid;
627 set_nlink(inode, stat->st_nlink);
628
629 mode = stat->st_mode & S_IALLUGO;
630 mode |= inode->i_mode & ~S_IALLUGO;
631 inode->i_mode = mode;
632
633 i_size_write(inode, stat->st_size);
634 inode->i_blocks = stat->st_blocks;
635 } else {
636 if (stat->st_result_mask & P9_STATS_ATIME) {
637 inode->i_atime.tv_sec = stat->st_atime_sec;
638 inode->i_atime.tv_nsec = stat->st_atime_nsec;
639 }
640 if (stat->st_result_mask & P9_STATS_MTIME) {
641 inode->i_mtime.tv_sec = stat->st_mtime_sec;
642 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
643 }
644 if (stat->st_result_mask & P9_STATS_CTIME) {
645 inode->i_ctime.tv_sec = stat->st_ctime_sec;
646 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
647 }
648 if (stat->st_result_mask & P9_STATS_UID)
649 inode->i_uid = stat->st_uid;
650 if (stat->st_result_mask & P9_STATS_GID)
651 inode->i_gid = stat->st_gid;
652 if (stat->st_result_mask & P9_STATS_NLINK)
653 set_nlink(inode, stat->st_nlink);
654 if (stat->st_result_mask & P9_STATS_MODE) {
655 inode->i_mode = stat->st_mode;
656 if ((S_ISBLK(inode->i_mode)) ||
657 (S_ISCHR(inode->i_mode)))
658 init_special_inode(inode, inode->i_mode,
659 inode->i_rdev);
660 }
661 if (stat->st_result_mask & P9_STATS_RDEV)
662 inode->i_rdev = new_decode_dev(stat->st_rdev);
663 if (stat->st_result_mask & P9_STATS_SIZE)
664 i_size_write(inode, stat->st_size);
665 if (stat->st_result_mask & P9_STATS_BLOCKS)
666 inode->i_blocks = stat->st_blocks;
667 }
668 if (stat->st_result_mask & P9_STATS_GEN)
669 inode->i_generation = stat->st_gen;
670
671 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
672 * because the inode structure does not have fields for them.
673 */
674 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
675}
676
677static int
678v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
679 const char *symname)
680{
681 int err;
682 kgid_t gid;
683 char *name;
684 struct p9_qid qid;
685 struct inode *inode;
686 struct p9_fid *dfid;
687 struct p9_fid *fid = NULL;
688 struct v9fs_session_info *v9ses;
689
690 name = (char *) dentry->d_name.name;
691 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
692 v9ses = v9fs_inode2v9ses(dir);
693
694 dfid = v9fs_fid_lookup(dentry->d_parent);
695 if (IS_ERR(dfid)) {
696 err = PTR_ERR(dfid);
697 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
698 return err;
699 }
700
701 gid = v9fs_get_fsgid_for_create(dir);
702
703 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
704 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
705
706 if (err < 0) {
707 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
708 goto error;
709 }
710
711 v9fs_invalidate_inode_attr(dir);
712 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
713 /* Now walk from the parent so we can get an unopened fid. */
714 fid = p9_client_walk(dfid, 1, &name, 1);
715 if (IS_ERR(fid)) {
716 err = PTR_ERR(fid);
717 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
718 err);
719 fid = NULL;
720 goto error;
721 }
722
723 /* instantiate inode and assign the unopened fid to dentry */
724 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
725 if (IS_ERR(inode)) {
726 err = PTR_ERR(inode);
727 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
728 err);
729 goto error;
730 }
731 v9fs_fid_add(dentry, fid);
732 d_instantiate(dentry, inode);
733 fid = NULL;
734 err = 0;
735 } else {
736 /* Not in cached mode. No need to populate inode with stat */
737 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
738 if (IS_ERR(inode)) {
739 err = PTR_ERR(inode);
740 goto error;
741 }
742 d_instantiate(dentry, inode);
743 }
744
745error:
746 if (fid)
747 p9_client_clunk(fid);
748
749 return err;
750}
751
752/**
753 * v9fs_vfs_link_dotl - create a hardlink for dotl
754 * @old_dentry: dentry for file to link to
755 * @dir: inode destination for new link
756 * @dentry: dentry for link
757 *
758 */
759
760static int
761v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
762 struct dentry *dentry)
763{
764 int err;
765 struct dentry *dir_dentry;
766 struct p9_fid *dfid, *oldfid;
767 struct v9fs_session_info *v9ses;
768
769 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
770 dir->i_ino, old_dentry, dentry);
771
772 v9ses = v9fs_inode2v9ses(dir);
773 dir_dentry = dentry->d_parent;
774 dfid = v9fs_fid_lookup(dir_dentry);
775 if (IS_ERR(dfid))
776 return PTR_ERR(dfid);
777
778 oldfid = v9fs_fid_lookup(old_dentry);
779 if (IS_ERR(oldfid))
780 return PTR_ERR(oldfid);
781
782 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
783
784 if (err < 0) {
785 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
786 return err;
787 }
788
789 v9fs_invalidate_inode_attr(dir);
790 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
791 /* Get the latest stat info from server. */
792 struct p9_fid *fid;
793 fid = v9fs_fid_lookup(old_dentry);
794 if (IS_ERR(fid))
795 return PTR_ERR(fid);
796
797 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
798 }
799 ihold(d_inode(old_dentry));
800 d_instantiate(dentry, d_inode(old_dentry));
801
802 return err;
803}
804
805/**
806 * v9fs_vfs_mknod_dotl - create a special file
807 * @dir: inode destination for new link
808 * @dentry: dentry for file
809 * @omode: mode for creation
810 * @rdev: device associated with special file
811 *
812 */
813static int
814v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
815 dev_t rdev)
816{
817 int err;
818 kgid_t gid;
819 char *name;
820 umode_t mode;
821 struct v9fs_session_info *v9ses;
822 struct p9_fid *fid = NULL, *dfid = NULL;
823 struct inode *inode;
824 struct p9_qid qid;
825 struct dentry *dir_dentry;
826 struct posix_acl *dacl = NULL, *pacl = NULL;
827
828 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
829 dir->i_ino, dentry, omode,
830 MAJOR(rdev), MINOR(rdev));
831
832 v9ses = v9fs_inode2v9ses(dir);
833 dir_dentry = dentry->d_parent;
834 dfid = v9fs_fid_lookup(dir_dentry);
835 if (IS_ERR(dfid)) {
836 err = PTR_ERR(dfid);
837 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
838 dfid = NULL;
839 goto error;
840 }
841
842 gid = v9fs_get_fsgid_for_create(dir);
843 mode = omode;
844 /* Update mode based on ACL value */
845 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
846 if (err) {
847 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
848 err);
849 goto error;
850 }
851 name = (char *) dentry->d_name.name;
852
853 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
854 if (err < 0)
855 goto error;
856
857 v9fs_invalidate_inode_attr(dir);
858 fid = p9_client_walk(dfid, 1, &name, 1);
859 if (IS_ERR(fid)) {
860 err = PTR_ERR(fid);
861 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
862 err);
863 fid = NULL;
864 goto error;
865 }
866
867 /* instantiate inode and assign the unopened fid to the dentry */
868 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
869 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
870 if (IS_ERR(inode)) {
871 err = PTR_ERR(inode);
872 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
873 err);
874 goto error;
875 }
876 v9fs_set_create_acl(inode, fid, dacl, pacl);
877 v9fs_fid_add(dentry, fid);
878 d_instantiate(dentry, inode);
879 fid = NULL;
880 err = 0;
881 } else {
882 /*
883 * Not in cached mode. No need to populate inode with stat.
884 * socket syscall returns a fd, so we need instantiate
885 */
886 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
887 if (IS_ERR(inode)) {
888 err = PTR_ERR(inode);
889 goto error;
890 }
891 v9fs_set_create_acl(inode, fid, dacl, pacl);
892 d_instantiate(dentry, inode);
893 }
894error:
895 if (fid)
896 p9_client_clunk(fid);
897 v9fs_put_acl(dacl, pacl);
898 return err;
899}
900
901/**
902 * v9fs_vfs_get_link_dotl - follow a symlink path
903 * @dentry: dentry for symlink
904 * @inode: inode for symlink
905 * @done: destructor for return value
906 */
907
908static const char *
909v9fs_vfs_get_link_dotl(struct dentry *dentry,
910 struct inode *inode,
911 struct delayed_call *done)
912{
913 struct p9_fid *fid;
914 char *target;
915 int retval;
916
917 if (!dentry)
918 return ERR_PTR(-ECHILD);
919
920 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
921
922 fid = v9fs_fid_lookup(dentry);
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 set_delayed_call(done, kfree_link, target);
929 return target;
930}
931
932int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
933{
934 loff_t i_size;
935 struct p9_stat_dotl *st;
936 struct v9fs_session_info *v9ses;
937
938 v9ses = v9fs_inode2v9ses(inode);
939 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
940 if (IS_ERR(st))
941 return PTR_ERR(st);
942 /*
943 * Don't update inode if the file type is different
944 */
945 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
946 goto out;
947
948 spin_lock(&inode->i_lock);
949 /*
950 * We don't want to refresh inode->i_size,
951 * because we may have cached data
952 */
953 i_size = inode->i_size;
954 v9fs_stat2inode_dotl(st, inode);
955 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
956 inode->i_size = i_size;
957 spin_unlock(&inode->i_lock);
958out:
959 kfree(st);
960 return 0;
961}
962
963const struct inode_operations v9fs_dir_inode_operations_dotl = {
964 .create = v9fs_vfs_create_dotl,
965 .atomic_open = v9fs_vfs_atomic_open_dotl,
966 .lookup = v9fs_vfs_lookup,
967 .link = v9fs_vfs_link_dotl,
968 .symlink = v9fs_vfs_symlink_dotl,
969 .unlink = v9fs_vfs_unlink,
970 .mkdir = v9fs_vfs_mkdir_dotl,
971 .rmdir = v9fs_vfs_rmdir,
972 .mknod = v9fs_vfs_mknod_dotl,
973 .rename = v9fs_vfs_rename,
974 .getattr = v9fs_vfs_getattr_dotl,
975 .setattr = v9fs_vfs_setattr_dotl,
976 .setxattr = generic_setxattr,
977 .getxattr = generic_getxattr,
978 .removexattr = generic_removexattr,
979 .listxattr = v9fs_listxattr,
980 .get_acl = v9fs_iop_get_acl,
981};
982
983const struct inode_operations v9fs_file_inode_operations_dotl = {
984 .getattr = v9fs_vfs_getattr_dotl,
985 .setattr = v9fs_vfs_setattr_dotl,
986 .setxattr = generic_setxattr,
987 .getxattr = generic_getxattr,
988 .removexattr = generic_removexattr,
989 .listxattr = v9fs_listxattr,
990 .get_acl = v9fs_iop_get_acl,
991};
992
993const struct inode_operations v9fs_symlink_inode_operations_dotl = {
994 .readlink = generic_readlink,
995 .get_link = v9fs_vfs_get_link_dotl,
996 .getattr = v9fs_vfs_getattr_dotl,
997 .setattr = v9fs_vfs_setattr_dotl,
998 .setxattr = generic_setxattr,
999 .getxattr = generic_getxattr,
1000 .removexattr = generic_removexattr,
1001 .listxattr = v9fs_listxattr,
1002};
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
31static int
32v9fs_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
44static 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
55static 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 */
81static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
82{
83 return 0;
84}
85
86static 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
96static 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 struct inode *inode;
104 struct v9fs_session_info *v9ses = sb->s_fs_info;
105 int (*test)(struct inode *inode, void *data);
106
107 if (new)
108 test = v9fs_test_new_inode_dotl;
109 else
110 test = v9fs_test_inode_dotl;
111
112 inode = iget5_locked(sb, QID2INO(qid), test, v9fs_set_inode_dotl, st);
113 if (!inode)
114 return ERR_PTR(-ENOMEM);
115 if (!(inode->i_state & I_NEW))
116 return inode;
117 /*
118 * initialize the inode with the stat info
119 * FIXME!! we may need support for stale inodes
120 * later.
121 */
122 inode->i_ino = QID2INO(qid);
123 retval = v9fs_init_inode(v9ses, inode,
124 st->st_mode, new_decode_dev(st->st_rdev));
125 if (retval)
126 goto error;
127
128 v9fs_stat2inode_dotl(st, inode, 0);
129 v9fs_set_netfs_context(inode);
130 v9fs_cache_inode_get_cookie(inode);
131 retval = v9fs_get_acl(inode, fid);
132 if (retval)
133 goto error;
134
135 unlock_new_inode(inode);
136 return inode;
137error:
138 iget_failed(inode);
139 return ERR_PTR(retval);
140
141}
142
143struct inode *
144v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
145 struct super_block *sb, int new)
146{
147 struct p9_stat_dotl *st;
148 struct inode *inode = NULL;
149
150 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
151 if (IS_ERR(st))
152 return ERR_CAST(st);
153
154 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
155 kfree(st);
156 return inode;
157}
158
159struct dotl_openflag_map {
160 int open_flag;
161 int dotl_flag;
162};
163
164static int v9fs_mapped_dotl_flags(int flags)
165{
166 int i;
167 int rflags = 0;
168 struct dotl_openflag_map dotl_oflag_map[] = {
169 { O_CREAT, P9_DOTL_CREATE },
170 { O_EXCL, P9_DOTL_EXCL },
171 { O_NOCTTY, P9_DOTL_NOCTTY },
172 { O_APPEND, P9_DOTL_APPEND },
173 { O_NONBLOCK, P9_DOTL_NONBLOCK },
174 { O_DSYNC, P9_DOTL_DSYNC },
175 { FASYNC, P9_DOTL_FASYNC },
176 { O_DIRECT, P9_DOTL_DIRECT },
177 { O_LARGEFILE, P9_DOTL_LARGEFILE },
178 { O_DIRECTORY, P9_DOTL_DIRECTORY },
179 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
180 { O_NOATIME, P9_DOTL_NOATIME },
181 { O_CLOEXEC, P9_DOTL_CLOEXEC },
182 { O_SYNC, P9_DOTL_SYNC},
183 };
184 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
185 if (flags & dotl_oflag_map[i].open_flag)
186 rflags |= dotl_oflag_map[i].dotl_flag;
187 }
188 return rflags;
189}
190
191/**
192 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
193 * plan 9 open flag.
194 * @flags: flags to convert
195 */
196int v9fs_open_to_dotl_flags(int flags)
197{
198 int rflags = 0;
199
200 /*
201 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
202 * and P9_DOTL_NOACCESS
203 */
204 rflags |= flags & O_ACCMODE;
205 rflags |= v9fs_mapped_dotl_flags(flags);
206
207 return rflags;
208}
209
210/**
211 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
212 * @idmap: The user namespace of the mount
213 * @dir: directory inode that is being created
214 * @dentry: dentry that is being deleted
215 * @omode: create permissions
216 * @excl: True if the file must not yet exist
217 *
218 */
219static int
220v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir,
221 struct dentry *dentry, umode_t omode, bool excl)
222{
223 return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0);
224}
225
226static int
227v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
228 struct file *file, unsigned int flags, umode_t omode)
229{
230 int err = 0;
231 kgid_t gid;
232 umode_t mode;
233 int p9_omode = v9fs_open_to_dotl_flags(flags);
234 const unsigned char *name = NULL;
235 struct p9_qid qid;
236 struct inode *inode;
237 struct p9_fid *fid = NULL;
238 struct p9_fid *dfid = NULL, *ofid = NULL;
239 struct v9fs_session_info *v9ses;
240 struct posix_acl *pacl = NULL, *dacl = NULL;
241 struct dentry *res = NULL;
242
243 if (d_in_lookup(dentry)) {
244 res = v9fs_vfs_lookup(dir, dentry, 0);
245 if (IS_ERR(res))
246 return PTR_ERR(res);
247
248 if (res)
249 dentry = res;
250 }
251
252 /* Only creates */
253 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
254 return finish_no_open(file, res);
255
256 v9ses = v9fs_inode2v9ses(dir);
257
258 name = dentry->d_name.name;
259 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
260 name, flags, omode);
261
262 dfid = v9fs_parent_fid(dentry);
263 if (IS_ERR(dfid)) {
264 err = PTR_ERR(dfid);
265 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
266 goto out;
267 }
268
269 /* clone a fid to use for creation */
270 ofid = clone_fid(dfid);
271 if (IS_ERR(ofid)) {
272 err = PTR_ERR(ofid);
273 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
274 goto out;
275 }
276
277 gid = v9fs_get_fsgid_for_create(dir);
278
279 mode = omode;
280 /* Update mode based on ACL value */
281 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
282 if (err) {
283 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n",
284 err);
285 goto out;
286 }
287
288 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
289 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
290 p9_debug(P9_DEBUG_CACHE,
291 "write-only file with writeback enabled, creating w/ O_RDWR\n");
292 }
293 err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid);
294 if (err < 0) {
295 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n",
296 err);
297 goto out;
298 }
299 v9fs_invalidate_inode_attr(dir);
300
301 /* instantiate inode and assign the unopened fid to the dentry */
302 fid = p9_client_walk(dfid, 1, &name, 1);
303 if (IS_ERR(fid)) {
304 err = PTR_ERR(fid);
305 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
306 goto out;
307 }
308 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
309 if (IS_ERR(inode)) {
310 err = PTR_ERR(inode);
311 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
312 goto out;
313 }
314 /* Now set the ACL based on the default value */
315 v9fs_set_create_acl(inode, fid, dacl, pacl);
316
317 v9fs_fid_add(dentry, &fid);
318 d_instantiate(dentry, inode);
319
320 /* Since we are opening a file, assign the open fid to the file */
321 err = finish_open(file, dentry, generic_file_open);
322 if (err)
323 goto out;
324 file->private_data = ofid;
325#ifdef CONFIG_9P_FSCACHE
326 if (v9ses->cache & CACHE_FSCACHE) {
327 struct v9fs_inode *v9inode = V9FS_I(inode);
328 fscache_use_cookie(v9fs_inode_cookie(v9inode),
329 file->f_mode & FMODE_WRITE);
330 }
331#endif
332 v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags);
333 v9fs_open_fid_add(inode, &ofid);
334 file->f_mode |= FMODE_CREATED;
335out:
336 p9_fid_put(dfid);
337 p9_fid_put(ofid);
338 p9_fid_put(fid);
339 v9fs_put_acl(dacl, pacl);
340 dput(res);
341 return err;
342}
343
344/**
345 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
346 * @idmap: The idmap of the mount
347 * @dir: inode that is being unlinked
348 * @dentry: dentry that is being unlinked
349 * @omode: mode for new directory
350 *
351 */
352
353static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
354 struct inode *dir, struct dentry *dentry,
355 umode_t omode)
356{
357 int err;
358 struct v9fs_session_info *v9ses;
359 struct p9_fid *fid = NULL, *dfid = NULL;
360 kgid_t gid;
361 const unsigned char *name;
362 umode_t mode;
363 struct inode *inode;
364 struct p9_qid qid;
365 struct posix_acl *dacl = NULL, *pacl = NULL;
366
367 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
368 v9ses = v9fs_inode2v9ses(dir);
369
370 omode |= S_IFDIR;
371 if (dir->i_mode & S_ISGID)
372 omode |= S_ISGID;
373
374 dfid = v9fs_parent_fid(dentry);
375 if (IS_ERR(dfid)) {
376 err = PTR_ERR(dfid);
377 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
378 goto error;
379 }
380
381 gid = v9fs_get_fsgid_for_create(dir);
382 mode = omode;
383 /* Update mode based on ACL value */
384 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
385 if (err) {
386 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
387 err);
388 goto error;
389 }
390 name = dentry->d_name.name;
391 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
392 if (err < 0)
393 goto error;
394 fid = p9_client_walk(dfid, 1, &name, 1);
395 if (IS_ERR(fid)) {
396 err = PTR_ERR(fid);
397 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
398 err);
399 goto error;
400 }
401
402 /* instantiate inode and assign the unopened fid to the dentry */
403 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
404 if (IS_ERR(inode)) {
405 err = PTR_ERR(inode);
406 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
407 err);
408 goto error;
409 }
410 v9fs_fid_add(dentry, &fid);
411 v9fs_set_create_acl(inode, fid, dacl, pacl);
412 d_instantiate(dentry, inode);
413 err = 0;
414 inc_nlink(dir);
415 v9fs_invalidate_inode_attr(dir);
416error:
417 p9_fid_put(fid);
418 v9fs_put_acl(dacl, pacl);
419 p9_fid_put(dfid);
420 return err;
421}
422
423static int
424v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap,
425 const struct path *path, struct kstat *stat,
426 u32 request_mask, unsigned int flags)
427{
428 struct dentry *dentry = path->dentry;
429 struct v9fs_session_info *v9ses;
430 struct p9_fid *fid;
431 struct inode *inode = d_inode(dentry);
432 struct p9_stat_dotl *st;
433
434 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
435 v9ses = v9fs_dentry2v9ses(dentry);
436 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
437 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
438 return 0;
439 } else if (v9ses->cache) {
440 if (S_ISREG(inode->i_mode)) {
441 int retval = filemap_fdatawrite(inode->i_mapping);
442
443 if (retval)
444 p9_debug(P9_DEBUG_ERROR,
445 "flushing writeback during getattr returned %d\n", retval);
446 }
447 }
448 fid = v9fs_fid_lookup(dentry);
449 if (IS_ERR(fid))
450 return PTR_ERR(fid);
451
452 /* Ask for all the fields in stat structure. Server will return
453 * whatever it supports
454 */
455
456 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
457 p9_fid_put(fid);
458 if (IS_ERR(st))
459 return PTR_ERR(st);
460
461 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
462 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
463 /* Change block size to what the server returned */
464 stat->blksize = st->st_blksize;
465
466 kfree(st);
467 return 0;
468}
469
470/*
471 * Attribute flags.
472 */
473#define P9_ATTR_MODE (1 << 0)
474#define P9_ATTR_UID (1 << 1)
475#define P9_ATTR_GID (1 << 2)
476#define P9_ATTR_SIZE (1 << 3)
477#define P9_ATTR_ATIME (1 << 4)
478#define P9_ATTR_MTIME (1 << 5)
479#define P9_ATTR_CTIME (1 << 6)
480#define P9_ATTR_ATIME_SET (1 << 7)
481#define P9_ATTR_MTIME_SET (1 << 8)
482
483struct dotl_iattr_map {
484 int iattr_valid;
485 int p9_iattr_valid;
486};
487
488static int v9fs_mapped_iattr_valid(int iattr_valid)
489{
490 int i;
491 int p9_iattr_valid = 0;
492 struct dotl_iattr_map dotl_iattr_map[] = {
493 { ATTR_MODE, P9_ATTR_MODE },
494 { ATTR_UID, P9_ATTR_UID },
495 { ATTR_GID, P9_ATTR_GID },
496 { ATTR_SIZE, P9_ATTR_SIZE },
497 { ATTR_ATIME, P9_ATTR_ATIME },
498 { ATTR_MTIME, P9_ATTR_MTIME },
499 { ATTR_CTIME, P9_ATTR_CTIME },
500 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
501 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
502 };
503 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
504 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
505 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
506 }
507 return p9_iattr_valid;
508}
509
510/**
511 * v9fs_vfs_setattr_dotl - set file metadata
512 * @idmap: idmap of the mount
513 * @dentry: file whose metadata to set
514 * @iattr: metadata assignment structure
515 *
516 */
517
518int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
519 struct dentry *dentry, struct iattr *iattr)
520{
521 int retval, use_dentry = 0;
522 struct inode *inode = d_inode(dentry);
523 struct v9fs_session_info __maybe_unused *v9ses;
524 struct p9_fid *fid = NULL;
525 struct p9_iattr_dotl p9attr = {
526 .uid = INVALID_UID,
527 .gid = INVALID_GID,
528 };
529
530 p9_debug(P9_DEBUG_VFS, "\n");
531
532 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
533 if (retval)
534 return retval;
535
536 v9ses = v9fs_dentry2v9ses(dentry);
537
538 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
539 if (iattr->ia_valid & ATTR_MODE)
540 p9attr.mode = iattr->ia_mode;
541 if (iattr->ia_valid & ATTR_UID)
542 p9attr.uid = iattr->ia_uid;
543 if (iattr->ia_valid & ATTR_GID)
544 p9attr.gid = iattr->ia_gid;
545 if (iattr->ia_valid & ATTR_SIZE)
546 p9attr.size = iattr->ia_size;
547 if (iattr->ia_valid & ATTR_ATIME_SET) {
548 p9attr.atime_sec = iattr->ia_atime.tv_sec;
549 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
550 }
551 if (iattr->ia_valid & ATTR_MTIME_SET) {
552 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
553 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
554 }
555
556 if (iattr->ia_valid & ATTR_FILE) {
557 fid = iattr->ia_file->private_data;
558 WARN_ON(!fid);
559 }
560 if (!fid) {
561 fid = v9fs_fid_lookup(dentry);
562 use_dentry = 1;
563 }
564 if (IS_ERR(fid))
565 return PTR_ERR(fid);
566
567 /* Write all dirty data */
568 if (S_ISREG(inode->i_mode)) {
569 retval = filemap_fdatawrite(inode->i_mapping);
570 if (retval < 0)
571 p9_debug(P9_DEBUG_ERROR,
572 "Flushing file prior to setattr failed: %d\n", retval);
573 }
574
575 retval = p9_client_setattr(fid, &p9attr);
576 if (retval < 0) {
577 if (use_dentry)
578 p9_fid_put(fid);
579 return retval;
580 }
581
582 if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size !=
583 i_size_read(inode)) {
584 truncate_setsize(inode, iattr->ia_size);
585 netfs_resize_file(netfs_inode(inode), iattr->ia_size, true);
586
587#ifdef CONFIG_9P_FSCACHE
588 if (v9ses->cache & CACHE_FSCACHE)
589 fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)),
590 iattr->ia_size);
591#endif
592 }
593
594 v9fs_invalidate_inode_attr(inode);
595 setattr_copy(&nop_mnt_idmap, inode, iattr);
596 mark_inode_dirty(inode);
597 if (iattr->ia_valid & ATTR_MODE) {
598 /* We also want to update ACL when we update mode bits */
599 retval = v9fs_acl_chmod(inode, fid);
600 if (retval < 0) {
601 if (use_dentry)
602 p9_fid_put(fid);
603 return retval;
604 }
605 }
606 if (use_dentry)
607 p9_fid_put(fid);
608
609 return 0;
610}
611
612/**
613 * v9fs_stat2inode_dotl - populate an inode structure with stat info
614 * @stat: stat structure
615 * @inode: inode to populate
616 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
617 *
618 */
619
620void
621v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
622 unsigned int flags)
623{
624 umode_t mode;
625 struct v9fs_inode *v9inode = V9FS_I(inode);
626
627 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
628 inode_set_atime(inode, stat->st_atime_sec,
629 stat->st_atime_nsec);
630 inode_set_mtime(inode, stat->st_mtime_sec,
631 stat->st_mtime_nsec);
632 inode_set_ctime(inode, stat->st_ctime_sec,
633 stat->st_ctime_nsec);
634 inode->i_uid = stat->st_uid;
635 inode->i_gid = stat->st_gid;
636 set_nlink(inode, stat->st_nlink);
637
638 mode = stat->st_mode & S_IALLUGO;
639 mode |= inode->i_mode & ~S_IALLUGO;
640 inode->i_mode = mode;
641
642 v9inode->netfs.remote_i_size = stat->st_size;
643 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
644 v9fs_i_size_write(inode, stat->st_size);
645 inode->i_blocks = stat->st_blocks;
646 } else {
647 if (stat->st_result_mask & P9_STATS_ATIME) {
648 inode_set_atime(inode, stat->st_atime_sec,
649 stat->st_atime_nsec);
650 }
651 if (stat->st_result_mask & P9_STATS_MTIME) {
652 inode_set_mtime(inode, stat->st_mtime_sec,
653 stat->st_mtime_nsec);
654 }
655 if (stat->st_result_mask & P9_STATS_CTIME) {
656 inode_set_ctime(inode, stat->st_ctime_sec,
657 stat->st_ctime_nsec);
658 }
659 if (stat->st_result_mask & P9_STATS_UID)
660 inode->i_uid = stat->st_uid;
661 if (stat->st_result_mask & P9_STATS_GID)
662 inode->i_gid = stat->st_gid;
663 if (stat->st_result_mask & P9_STATS_NLINK)
664 set_nlink(inode, stat->st_nlink);
665 if (stat->st_result_mask & P9_STATS_MODE) {
666 mode = stat->st_mode & S_IALLUGO;
667 mode |= inode->i_mode & ~S_IALLUGO;
668 inode->i_mode = mode;
669 }
670 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
671 stat->st_result_mask & P9_STATS_SIZE) {
672 v9inode->netfs.remote_i_size = stat->st_size;
673 v9fs_i_size_write(inode, stat->st_size);
674 }
675 if (stat->st_result_mask & P9_STATS_BLOCKS)
676 inode->i_blocks = stat->st_blocks;
677 }
678 if (stat->st_result_mask & P9_STATS_GEN)
679 inode->i_generation = stat->st_gen;
680
681 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
682 * because the inode structure does not have fields for them.
683 */
684 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
685}
686
687static int
688v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir,
689 struct dentry *dentry, const char *symname)
690{
691 int err;
692 kgid_t gid;
693 const unsigned char *name;
694 struct p9_qid qid;
695 struct p9_fid *dfid;
696 struct p9_fid *fid = NULL;
697
698 name = dentry->d_name.name;
699 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
700
701 dfid = v9fs_parent_fid(dentry);
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, 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
720error:
721 p9_fid_put(fid);
722 p9_fid_put(dfid);
723 return err;
724}
725
726/**
727 * v9fs_vfs_link_dotl - create a hardlink for dotl
728 * @old_dentry: dentry for file to link to
729 * @dir: inode destination for new link
730 * @dentry: dentry for link
731 *
732 */
733
734static int
735v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
736 struct dentry *dentry)
737{
738 int err;
739 struct p9_fid *dfid, *oldfid;
740 struct v9fs_session_info *v9ses;
741
742 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
743 dir->i_ino, old_dentry, dentry);
744
745 v9ses = v9fs_inode2v9ses(dir);
746 dfid = v9fs_parent_fid(dentry);
747 if (IS_ERR(dfid))
748 return PTR_ERR(dfid);
749
750 oldfid = v9fs_fid_lookup(old_dentry);
751 if (IS_ERR(oldfid)) {
752 p9_fid_put(dfid);
753 return PTR_ERR(oldfid);
754 }
755
756 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
757
758 p9_fid_put(dfid);
759 p9_fid_put(oldfid);
760 if (err < 0) {
761 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
762 return err;
763 }
764
765 v9fs_invalidate_inode_attr(dir);
766 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
767 /* Get the latest stat info from server. */
768 struct p9_fid *fid;
769
770 fid = v9fs_fid_lookup(old_dentry);
771 if (IS_ERR(fid))
772 return PTR_ERR(fid);
773
774 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
775 p9_fid_put(fid);
776 }
777 ihold(d_inode(old_dentry));
778 d_instantiate(dentry, d_inode(old_dentry));
779
780 return err;
781}
782
783/**
784 * v9fs_vfs_mknod_dotl - create a special file
785 * @idmap: The idmap of the mount
786 * @dir: inode destination for new link
787 * @dentry: dentry for file
788 * @omode: mode for creation
789 * @rdev: device associated with special file
790 *
791 */
792static int
793v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
794 struct dentry *dentry, umode_t omode, dev_t rdev)
795{
796 int err;
797 kgid_t gid;
798 const unsigned char *name;
799 umode_t mode;
800 struct v9fs_session_info *v9ses;
801 struct p9_fid *fid = NULL, *dfid = NULL;
802 struct inode *inode;
803 struct p9_qid qid;
804 struct posix_acl *dacl = NULL, *pacl = NULL;
805
806 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
807 dir->i_ino, dentry, omode,
808 MAJOR(rdev), MINOR(rdev));
809
810 v9ses = v9fs_inode2v9ses(dir);
811 dfid = v9fs_parent_fid(dentry);
812 if (IS_ERR(dfid)) {
813 err = PTR_ERR(dfid);
814 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
815 goto error;
816 }
817
818 gid = v9fs_get_fsgid_for_create(dir);
819 mode = omode;
820 /* Update mode based on ACL value */
821 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
822 if (err) {
823 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
824 err);
825 goto error;
826 }
827 name = dentry->d_name.name;
828
829 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
830 if (err < 0)
831 goto error;
832
833 v9fs_invalidate_inode_attr(dir);
834 fid = p9_client_walk(dfid, 1, &name, 1);
835 if (IS_ERR(fid)) {
836 err = PTR_ERR(fid);
837 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
838 err);
839 goto error;
840 }
841 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
842 if (IS_ERR(inode)) {
843 err = PTR_ERR(inode);
844 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
845 err);
846 goto error;
847 }
848 v9fs_set_create_acl(inode, fid, dacl, pacl);
849 v9fs_fid_add(dentry, &fid);
850 d_instantiate(dentry, inode);
851 err = 0;
852error:
853 p9_fid_put(fid);
854 v9fs_put_acl(dacl, pacl);
855 p9_fid_put(dfid);
856
857 return err;
858}
859
860/**
861 * v9fs_vfs_get_link_dotl - follow a symlink path
862 * @dentry: dentry for symlink
863 * @inode: inode for symlink
864 * @done: destructor for return value
865 */
866
867static const char *
868v9fs_vfs_get_link_dotl(struct dentry *dentry,
869 struct inode *inode,
870 struct delayed_call *done)
871{
872 struct p9_fid *fid;
873 char *target;
874 int retval;
875
876 if (!dentry)
877 return ERR_PTR(-ECHILD);
878
879 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
880
881 fid = v9fs_fid_lookup(dentry);
882 if (IS_ERR(fid))
883 return ERR_CAST(fid);
884 retval = p9_client_readlink(fid, &target);
885 p9_fid_put(fid);
886 if (retval)
887 return ERR_PTR(retval);
888 set_delayed_call(done, kfree_link, target);
889 return target;
890}
891
892int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
893{
894 struct p9_stat_dotl *st;
895 struct v9fs_session_info *v9ses;
896 unsigned int flags;
897
898 v9ses = v9fs_inode2v9ses(inode);
899 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
900 if (IS_ERR(st))
901 return PTR_ERR(st);
902 /*
903 * Don't update inode if the file type is different
904 */
905 if (inode_wrong_type(inode, st->st_mode))
906 goto out;
907
908 /*
909 * We don't want to refresh inode->i_size,
910 * because we may have cached data
911 */
912 flags = (v9ses->cache & CACHE_LOOSE) ?
913 V9FS_STAT2INODE_KEEP_ISIZE : 0;
914 v9fs_stat2inode_dotl(st, inode, flags);
915out:
916 kfree(st);
917 return 0;
918}
919
920const struct inode_operations v9fs_dir_inode_operations_dotl = {
921 .create = v9fs_vfs_create_dotl,
922 .atomic_open = v9fs_vfs_atomic_open_dotl,
923 .lookup = v9fs_vfs_lookup,
924 .link = v9fs_vfs_link_dotl,
925 .symlink = v9fs_vfs_symlink_dotl,
926 .unlink = v9fs_vfs_unlink,
927 .mkdir = v9fs_vfs_mkdir_dotl,
928 .rmdir = v9fs_vfs_rmdir,
929 .mknod = v9fs_vfs_mknod_dotl,
930 .rename = v9fs_vfs_rename,
931 .getattr = v9fs_vfs_getattr_dotl,
932 .setattr = v9fs_vfs_setattr_dotl,
933 .listxattr = v9fs_listxattr,
934 .get_inode_acl = v9fs_iop_get_inode_acl,
935 .get_acl = v9fs_iop_get_acl,
936 .set_acl = v9fs_iop_set_acl,
937};
938
939const struct inode_operations v9fs_file_inode_operations_dotl = {
940 .getattr = v9fs_vfs_getattr_dotl,
941 .setattr = v9fs_vfs_setattr_dotl,
942 .listxattr = v9fs_listxattr,
943 .get_inode_acl = v9fs_iop_get_inode_acl,
944 .get_acl = v9fs_iop_get_acl,
945 .set_acl = v9fs_iop_set_acl,
946};
947
948const struct inode_operations v9fs_symlink_inode_operations_dotl = {
949 .get_link = v9fs_vfs_get_link_dotl,
950 .getattr = v9fs_vfs_getattr_dotl,
951 .setattr = v9fs_vfs_setattr_dotl,
952 .listxattr = v9fs_listxattr,
953};