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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/sched.h>
19#include <linux/slab.h>
20#include <linux/xattr.h>
21#include <linux/posix_acl.h>
22#include <net/9p/9p.h>
23#include <net/9p/client.h>
24
25#include "v9fs.h"
26#include "v9fs_vfs.h"
27#include "fid.h"
28#include "cache.h"
29#include "xattr.h"
30#include "acl.h"
31
32static int
33v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
34 struct dentry *dentry, umode_t omode, dev_t rdev);
35
36/**
37 * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object
38 * @dir_inode: The directory inode
39 *
40 * Helper function to get the gid for creating a
41 * new file system object. This checks the S_ISGID to determine the owning
42 * group of the new file system object.
43 */
44
45static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
46{
47 BUG_ON(dir_inode == NULL);
48
49 if (dir_inode->i_mode & S_ISGID) {
50 /* set_gid bit is set.*/
51 return dir_inode->i_gid;
52 }
53 return current_fsgid();
54}
55
56static int v9fs_test_inode_dotl(struct inode *inode, void *data)
57{
58 struct v9fs_inode *v9inode = V9FS_I(inode);
59 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
60
61 /* don't match inode of different type */
62 if (inode_wrong_type(inode, st->st_mode))
63 return 0;
64
65 if (inode->i_generation != st->st_gen)
66 return 0;
67
68 /* compare qid details */
69 if (memcmp(&v9inode->qid.version,
70 &st->qid.version, sizeof(v9inode->qid.version)))
71 return 0;
72
73 if (v9inode->qid.type != st->qid.type)
74 return 0;
75
76 if (v9inode->qid.path != st->qid.path)
77 return 0;
78 return 1;
79}
80
81/* Always get a new inode */
82static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
83{
84 return 0;
85}
86
87static int v9fs_set_inode_dotl(struct inode *inode, void *data)
88{
89 struct v9fs_inode *v9inode = V9FS_I(inode);
90 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
91
92 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
93 inode->i_generation = st->st_gen;
94 return 0;
95}
96
97static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
98 struct p9_qid *qid,
99 struct p9_fid *fid,
100 struct p9_stat_dotl *st,
101 int new)
102{
103 int retval;
104 unsigned long i_ino;
105 struct inode *inode;
106 struct v9fs_session_info *v9ses = sb->s_fs_info;
107 int (*test)(struct inode *inode, void *data);
108
109 if (new)
110 test = v9fs_test_new_inode_dotl;
111 else
112 test = v9fs_test_inode_dotl;
113
114 i_ino = v9fs_qid2ino(qid);
115 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
116 if (!inode)
117 return ERR_PTR(-ENOMEM);
118 if (!(inode->i_state & I_NEW))
119 return inode;
120 /*
121 * initialize the inode with the stat info
122 * FIXME!! we may need support for stale inodes
123 * later.
124 */
125 inode->i_ino = i_ino;
126 retval = v9fs_init_inode(v9ses, inode,
127 st->st_mode, new_decode_dev(st->st_rdev));
128 if (retval)
129 goto error;
130
131 v9fs_stat2inode_dotl(st, inode, 0);
132 v9fs_cache_inode_get_cookie(inode);
133 retval = v9fs_get_acl(inode, fid);
134 if (retval)
135 goto error;
136
137 unlock_new_inode(inode);
138 return inode;
139error:
140 iget_failed(inode);
141 return ERR_PTR(retval);
142
143}
144
145struct inode *
146v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
147 struct super_block *sb, int new)
148{
149 struct p9_stat_dotl *st;
150 struct inode *inode = NULL;
151
152 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
153 if (IS_ERR(st))
154 return ERR_CAST(st);
155
156 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
157 kfree(st);
158 return inode;
159}
160
161struct dotl_openflag_map {
162 int open_flag;
163 int dotl_flag;
164};
165
166static int v9fs_mapped_dotl_flags(int flags)
167{
168 int i;
169 int rflags = 0;
170 struct dotl_openflag_map dotl_oflag_map[] = {
171 { O_CREAT, P9_DOTL_CREATE },
172 { O_EXCL, P9_DOTL_EXCL },
173 { O_NOCTTY, P9_DOTL_NOCTTY },
174 { O_APPEND, P9_DOTL_APPEND },
175 { O_NONBLOCK, P9_DOTL_NONBLOCK },
176 { O_DSYNC, P9_DOTL_DSYNC },
177 { FASYNC, P9_DOTL_FASYNC },
178 { O_DIRECT, P9_DOTL_DIRECT },
179 { O_LARGEFILE, P9_DOTL_LARGEFILE },
180 { O_DIRECTORY, P9_DOTL_DIRECTORY },
181 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
182 { O_NOATIME, P9_DOTL_NOATIME },
183 { O_CLOEXEC, P9_DOTL_CLOEXEC },
184 { O_SYNC, P9_DOTL_SYNC},
185 };
186 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
187 if (flags & dotl_oflag_map[i].open_flag)
188 rflags |= dotl_oflag_map[i].dotl_flag;
189 }
190 return rflags;
191}
192
193/**
194 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
195 * plan 9 open flag.
196 * @flags: flags to convert
197 */
198int v9fs_open_to_dotl_flags(int flags)
199{
200 int rflags = 0;
201
202 /*
203 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
204 * and P9_DOTL_NOACCESS
205 */
206 rflags |= flags & O_ACCMODE;
207 rflags |= v9fs_mapped_dotl_flags(flags);
208
209 return rflags;
210}
211
212/**
213 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
214 * @mnt_userns: The user namespace of the mount
215 * @dir: directory inode that is being created
216 * @dentry: dentry that is being deleted
217 * @omode: create permissions
218 * @excl: True if the file must not yet exist
219 *
220 */
221static int
222v9fs_vfs_create_dotl(struct user_namespace *mnt_userns, struct inode *dir,
223 struct dentry *dentry, umode_t omode, bool excl)
224{
225 return v9fs_vfs_mknod_dotl(mnt_userns, dir, dentry, omode, 0);
226}
227
228static int
229v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
230 struct file *file, unsigned int flags, umode_t omode)
231{
232 int err = 0;
233 kgid_t gid;
234 umode_t mode;
235 const unsigned char *name = NULL;
236 struct p9_qid qid;
237 struct inode *inode;
238 struct p9_fid *fid = NULL;
239 struct v9fs_inode *v9inode;
240 struct p9_fid *dfid = NULL, *ofid = NULL, *inode_fid = NULL;
241 struct v9fs_session_info *v9ses;
242 struct posix_acl *pacl = NULL, *dacl = NULL;
243 struct dentry *res = NULL;
244
245 if (d_in_lookup(dentry)) {
246 res = v9fs_vfs_lookup(dir, dentry, 0);
247 if (IS_ERR(res))
248 return PTR_ERR(res);
249
250 if (res)
251 dentry = res;
252 }
253
254 /* Only creates */
255 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
256 return finish_no_open(file, res);
257
258 v9ses = v9fs_inode2v9ses(dir);
259
260 name = dentry->d_name.name;
261 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
262 name, flags, omode);
263
264 dfid = v9fs_parent_fid(dentry);
265 if (IS_ERR(dfid)) {
266 err = PTR_ERR(dfid);
267 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
268 goto out;
269 }
270
271 /* clone a fid to use for creation */
272 ofid = clone_fid(dfid);
273 if (IS_ERR(ofid)) {
274 err = PTR_ERR(ofid);
275 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
276 goto out;
277 }
278
279 gid = v9fs_get_fsgid_for_create(dir);
280
281 mode = omode;
282 /* Update mode based on ACL value */
283 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
284 if (err) {
285 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
286 err);
287 goto out;
288 }
289 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
290 mode, gid, &qid);
291 if (err < 0) {
292 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
293 err);
294 goto out;
295 }
296 v9fs_invalidate_inode_attr(dir);
297
298 /* instantiate inode and assign the unopened fid to the dentry */
299 fid = p9_client_walk(dfid, 1, &name, 1);
300 if (IS_ERR(fid)) {
301 err = PTR_ERR(fid);
302 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
303 goto out;
304 }
305 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
306 if (IS_ERR(inode)) {
307 err = PTR_ERR(inode);
308 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
309 goto out;
310 }
311 /* Now set the ACL based on the default value */
312 v9fs_set_create_acl(inode, fid, dacl, pacl);
313
314 v9fs_fid_add(dentry, &fid);
315 d_instantiate(dentry, inode);
316
317 v9inode = V9FS_I(inode);
318 mutex_lock(&v9inode->v_mutex);
319 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
320 !v9inode->writeback_fid &&
321 ((flags & O_ACCMODE) != O_RDONLY)) {
322 /*
323 * clone a fid and add it to writeback_fid
324 * we do it during open time instead of
325 * page dirty time via write_begin/page_mkwrite
326 * because we want write after unlink usecase
327 * to work.
328 */
329 inode_fid = v9fs_writeback_fid(dentry);
330 if (IS_ERR(inode_fid)) {
331 err = PTR_ERR(inode_fid);
332 mutex_unlock(&v9inode->v_mutex);
333 goto out;
334 }
335 v9inode->writeback_fid = (void *) inode_fid;
336 }
337 mutex_unlock(&v9inode->v_mutex);
338 /* Since we are opening a file, assign the open fid to the file */
339 err = finish_open(file, dentry, generic_file_open);
340 if (err)
341 goto out;
342 file->private_data = ofid;
343 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
344 fscache_use_cookie(v9fs_inode_cookie(v9inode),
345 file->f_mode & FMODE_WRITE);
346 v9fs_open_fid_add(inode, &ofid);
347 file->f_mode |= FMODE_CREATED;
348out:
349 p9_fid_put(dfid);
350 p9_fid_put(ofid);
351 p9_fid_put(fid);
352 v9fs_put_acl(dacl, pacl);
353 dput(res);
354 return err;
355}
356
357/**
358 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
359 * @mnt_userns: The user namespace of the mount
360 * @dir: inode that is being unlinked
361 * @dentry: dentry that is being unlinked
362 * @omode: mode for new directory
363 *
364 */
365
366static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns,
367 struct inode *dir, struct dentry *dentry,
368 umode_t omode)
369{
370 int err;
371 struct v9fs_session_info *v9ses;
372 struct p9_fid *fid = NULL, *dfid = NULL;
373 kgid_t gid;
374 const unsigned char *name;
375 umode_t mode;
376 struct inode *inode;
377 struct p9_qid qid;
378 struct posix_acl *dacl = NULL, *pacl = NULL;
379
380 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
381 err = 0;
382 v9ses = v9fs_inode2v9ses(dir);
383
384 omode |= S_IFDIR;
385 if (dir->i_mode & S_ISGID)
386 omode |= S_ISGID;
387
388 dfid = v9fs_parent_fid(dentry);
389 if (IS_ERR(dfid)) {
390 err = PTR_ERR(dfid);
391 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
392 goto error;
393 }
394
395 gid = v9fs_get_fsgid_for_create(dir);
396 mode = omode;
397 /* Update mode based on ACL value */
398 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
399 if (err) {
400 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
401 err);
402 goto error;
403 }
404 name = dentry->d_name.name;
405 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
406 if (err < 0)
407 goto error;
408 fid = p9_client_walk(dfid, 1, &name, 1);
409 if (IS_ERR(fid)) {
410 err = PTR_ERR(fid);
411 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
412 err);
413 goto error;
414 }
415
416 /* instantiate inode and assign the unopened fid to the dentry */
417 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
418 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
419 if (IS_ERR(inode)) {
420 err = PTR_ERR(inode);
421 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
422 err);
423 goto error;
424 }
425 v9fs_fid_add(dentry, &fid);
426 v9fs_set_create_acl(inode, fid, dacl, pacl);
427 d_instantiate(dentry, inode);
428 err = 0;
429 } else {
430 /*
431 * Not in cached mode. No need to populate
432 * inode with stat. We need to get an inode
433 * so that we can set the acl with dentry
434 */
435 inode = v9fs_get_inode(dir->i_sb, mode, 0);
436 if (IS_ERR(inode)) {
437 err = PTR_ERR(inode);
438 goto error;
439 }
440 v9fs_set_create_acl(inode, fid, dacl, pacl);
441 d_instantiate(dentry, inode);
442 }
443 inc_nlink(dir);
444 v9fs_invalidate_inode_attr(dir);
445error:
446 p9_fid_put(fid);
447 v9fs_put_acl(dacl, pacl);
448 p9_fid_put(dfid);
449 return err;
450}
451
452static int
453v9fs_vfs_getattr_dotl(struct user_namespace *mnt_userns,
454 const struct path *path, struct kstat *stat,
455 u32 request_mask, unsigned int flags)
456{
457 struct dentry *dentry = path->dentry;
458 struct v9fs_session_info *v9ses;
459 struct p9_fid *fid;
460 struct p9_stat_dotl *st;
461
462 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
463 v9ses = v9fs_dentry2v9ses(dentry);
464 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
465 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
466 return 0;
467 }
468 fid = v9fs_fid_lookup(dentry);
469 if (IS_ERR(fid))
470 return PTR_ERR(fid);
471
472 /* Ask for all the fields in stat structure. Server will return
473 * whatever it supports
474 */
475
476 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
477 p9_fid_put(fid);
478 if (IS_ERR(st))
479 return PTR_ERR(st);
480
481 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
482 generic_fillattr(&init_user_ns, d_inode(dentry), stat);
483 /* Change block size to what the server returned */
484 stat->blksize = st->st_blksize;
485
486 kfree(st);
487 return 0;
488}
489
490/*
491 * Attribute flags.
492 */
493#define P9_ATTR_MODE (1 << 0)
494#define P9_ATTR_UID (1 << 1)
495#define P9_ATTR_GID (1 << 2)
496#define P9_ATTR_SIZE (1 << 3)
497#define P9_ATTR_ATIME (1 << 4)
498#define P9_ATTR_MTIME (1 << 5)
499#define P9_ATTR_CTIME (1 << 6)
500#define P9_ATTR_ATIME_SET (1 << 7)
501#define P9_ATTR_MTIME_SET (1 << 8)
502
503struct dotl_iattr_map {
504 int iattr_valid;
505 int p9_iattr_valid;
506};
507
508static int v9fs_mapped_iattr_valid(int iattr_valid)
509{
510 int i;
511 int p9_iattr_valid = 0;
512 struct dotl_iattr_map dotl_iattr_map[] = {
513 { ATTR_MODE, P9_ATTR_MODE },
514 { ATTR_UID, P9_ATTR_UID },
515 { ATTR_GID, P9_ATTR_GID },
516 { ATTR_SIZE, P9_ATTR_SIZE },
517 { ATTR_ATIME, P9_ATTR_ATIME },
518 { ATTR_MTIME, P9_ATTR_MTIME },
519 { ATTR_CTIME, P9_ATTR_CTIME },
520 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
521 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
522 };
523 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
524 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
525 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
526 }
527 return p9_iattr_valid;
528}
529
530/**
531 * v9fs_vfs_setattr_dotl - set file metadata
532 * @mnt_userns: The user namespace of the mount
533 * @dentry: file whose metadata to set
534 * @iattr: metadata assignment structure
535 *
536 */
537
538int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns,
539 struct dentry *dentry, struct iattr *iattr)
540{
541 int retval, use_dentry = 0;
542 struct p9_fid *fid = NULL;
543 struct p9_iattr_dotl p9attr = {
544 .uid = INVALID_UID,
545 .gid = INVALID_GID,
546 };
547 struct inode *inode = d_inode(dentry);
548
549 p9_debug(P9_DEBUG_VFS, "\n");
550
551 retval = setattr_prepare(&init_user_ns, dentry, iattr);
552 if (retval)
553 return retval;
554
555 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
556 if (iattr->ia_valid & ATTR_MODE)
557 p9attr.mode = iattr->ia_mode;
558 if (iattr->ia_valid & ATTR_UID)
559 p9attr.uid = iattr->ia_uid;
560 if (iattr->ia_valid & ATTR_GID)
561 p9attr.gid = iattr->ia_gid;
562 if (iattr->ia_valid & ATTR_SIZE)
563 p9attr.size = iattr->ia_size;
564 if (iattr->ia_valid & ATTR_ATIME_SET) {
565 p9attr.atime_sec = iattr->ia_atime.tv_sec;
566 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
567 }
568 if (iattr->ia_valid & ATTR_MTIME_SET) {
569 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
570 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
571 }
572
573 if (iattr->ia_valid & ATTR_FILE) {
574 fid = iattr->ia_file->private_data;
575 WARN_ON(!fid);
576 }
577 if (!fid) {
578 fid = v9fs_fid_lookup(dentry);
579 use_dentry = 1;
580 }
581 if (IS_ERR(fid))
582 return PTR_ERR(fid);
583
584 /* Write all dirty data */
585 if (S_ISREG(inode->i_mode))
586 filemap_write_and_wait(inode->i_mapping);
587
588 retval = p9_client_setattr(fid, &p9attr);
589 if (retval < 0) {
590 if (use_dentry)
591 p9_fid_put(fid);
592 return retval;
593 }
594
595 if ((iattr->ia_valid & ATTR_SIZE) &&
596 iattr->ia_size != i_size_read(inode))
597 truncate_setsize(inode, iattr->ia_size);
598
599 v9fs_invalidate_inode_attr(inode);
600 setattr_copy(&init_user_ns, inode, iattr);
601 mark_inode_dirty(inode);
602 if (iattr->ia_valid & ATTR_MODE) {
603 /* We also want to update ACL when we update mode bits */
604 retval = v9fs_acl_chmod(inode, fid);
605 if (retval < 0) {
606 if (use_dentry)
607 p9_fid_put(fid);
608 return retval;
609 }
610 }
611 if (use_dentry)
612 p9_fid_put(fid);
613
614 return 0;
615}
616
617/**
618 * v9fs_stat2inode_dotl - populate an inode structure with stat info
619 * @stat: stat structure
620 * @inode: inode to populate
621 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
622 *
623 */
624
625void
626v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
627 unsigned int flags)
628{
629 umode_t mode;
630 struct v9fs_inode *v9inode = V9FS_I(inode);
631
632 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
633 inode->i_atime.tv_sec = stat->st_atime_sec;
634 inode->i_atime.tv_nsec = stat->st_atime_nsec;
635 inode->i_mtime.tv_sec = stat->st_mtime_sec;
636 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
637 inode->i_ctime.tv_sec = stat->st_ctime_sec;
638 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
639 inode->i_uid = stat->st_uid;
640 inode->i_gid = stat->st_gid;
641 set_nlink(inode, stat->st_nlink);
642
643 mode = stat->st_mode & S_IALLUGO;
644 mode |= inode->i_mode & ~S_IALLUGO;
645 inode->i_mode = mode;
646
647 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
648 v9fs_i_size_write(inode, stat->st_size);
649 inode->i_blocks = stat->st_blocks;
650 } else {
651 if (stat->st_result_mask & P9_STATS_ATIME) {
652 inode->i_atime.tv_sec = stat->st_atime_sec;
653 inode->i_atime.tv_nsec = stat->st_atime_nsec;
654 }
655 if (stat->st_result_mask & P9_STATS_MTIME) {
656 inode->i_mtime.tv_sec = stat->st_mtime_sec;
657 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
658 }
659 if (stat->st_result_mask & P9_STATS_CTIME) {
660 inode->i_ctime.tv_sec = stat->st_ctime_sec;
661 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
662 }
663 if (stat->st_result_mask & P9_STATS_UID)
664 inode->i_uid = stat->st_uid;
665 if (stat->st_result_mask & P9_STATS_GID)
666 inode->i_gid = stat->st_gid;
667 if (stat->st_result_mask & P9_STATS_NLINK)
668 set_nlink(inode, stat->st_nlink);
669 if (stat->st_result_mask & P9_STATS_MODE) {
670 mode = stat->st_mode & S_IALLUGO;
671 mode |= inode->i_mode & ~S_IALLUGO;
672 inode->i_mode = mode;
673 }
674 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
675 stat->st_result_mask & P9_STATS_SIZE)
676 v9fs_i_size_write(inode, stat->st_size);
677 if (stat->st_result_mask & P9_STATS_BLOCKS)
678 inode->i_blocks = stat->st_blocks;
679 }
680 if (stat->st_result_mask & P9_STATS_GEN)
681 inode->i_generation = stat->st_gen;
682
683 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
684 * because the inode structure does not have fields for them.
685 */
686 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
687}
688
689static int
690v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir,
691 struct dentry *dentry, const char *symname)
692{
693 int err;
694 kgid_t gid;
695 const unsigned char *name;
696 struct p9_qid qid;
697 struct inode *inode;
698 struct p9_fid *dfid;
699 struct p9_fid *fid = NULL;
700 struct v9fs_session_info *v9ses;
701
702 name = dentry->d_name.name;
703 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
704 v9ses = v9fs_inode2v9ses(dir);
705
706 dfid = v9fs_parent_fid(dentry);
707 if (IS_ERR(dfid)) {
708 err = PTR_ERR(dfid);
709 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
710 return err;
711 }
712
713 gid = v9fs_get_fsgid_for_create(dir);
714
715 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
716 err = p9_client_symlink(dfid, name, symname, gid, &qid);
717
718 if (err < 0) {
719 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
720 goto error;
721 }
722
723 v9fs_invalidate_inode_attr(dir);
724 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
725 /* Now walk from the parent so we can get an unopened fid. */
726 fid = p9_client_walk(dfid, 1, &name, 1);
727 if (IS_ERR(fid)) {
728 err = PTR_ERR(fid);
729 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
730 err);
731 goto error;
732 }
733
734 /* instantiate inode and assign the unopened fid to dentry */
735 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
736 if (IS_ERR(inode)) {
737 err = PTR_ERR(inode);
738 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
739 err);
740 goto error;
741 }
742 v9fs_fid_add(dentry, &fid);
743 d_instantiate(dentry, inode);
744 err = 0;
745 } else {
746 /* Not in cached mode. No need to populate inode with stat */
747 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
748 if (IS_ERR(inode)) {
749 err = PTR_ERR(inode);
750 goto error;
751 }
752 d_instantiate(dentry, inode);
753 }
754
755error:
756 p9_fid_put(fid);
757 p9_fid_put(dfid);
758 return err;
759}
760
761/**
762 * v9fs_vfs_link_dotl - create a hardlink for dotl
763 * @old_dentry: dentry for file to link to
764 * @dir: inode destination for new link
765 * @dentry: dentry for link
766 *
767 */
768
769static int
770v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
771 struct dentry *dentry)
772{
773 int err;
774 struct p9_fid *dfid, *oldfid;
775 struct v9fs_session_info *v9ses;
776
777 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
778 dir->i_ino, old_dentry, dentry);
779
780 v9ses = v9fs_inode2v9ses(dir);
781 dfid = v9fs_parent_fid(dentry);
782 if (IS_ERR(dfid))
783 return PTR_ERR(dfid);
784
785 oldfid = v9fs_fid_lookup(old_dentry);
786 if (IS_ERR(oldfid)) {
787 p9_fid_put(dfid);
788 return PTR_ERR(oldfid);
789 }
790
791 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
792
793 p9_fid_put(dfid);
794 p9_fid_put(oldfid);
795 if (err < 0) {
796 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
797 return err;
798 }
799
800 v9fs_invalidate_inode_attr(dir);
801 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
802 /* Get the latest stat info from server. */
803 struct p9_fid *fid;
804
805 fid = v9fs_fid_lookup(old_dentry);
806 if (IS_ERR(fid))
807 return PTR_ERR(fid);
808
809 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
810 p9_fid_put(fid);
811 }
812 ihold(d_inode(old_dentry));
813 d_instantiate(dentry, d_inode(old_dentry));
814
815 return err;
816}
817
818/**
819 * v9fs_vfs_mknod_dotl - create a special file
820 * @mnt_userns: The user namespace of the mount
821 * @dir: inode destination for new link
822 * @dentry: dentry for file
823 * @omode: mode for creation
824 * @rdev: device associated with special file
825 *
826 */
827static int
828v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir,
829 struct dentry *dentry, umode_t omode, dev_t rdev)
830{
831 int err;
832 kgid_t gid;
833 const unsigned char *name;
834 umode_t mode;
835 struct v9fs_session_info *v9ses;
836 struct p9_fid *fid = NULL, *dfid = NULL;
837 struct inode *inode;
838 struct p9_qid qid;
839 struct posix_acl *dacl = NULL, *pacl = NULL;
840
841 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
842 dir->i_ino, dentry, omode,
843 MAJOR(rdev), MINOR(rdev));
844
845 v9ses = v9fs_inode2v9ses(dir);
846 dfid = v9fs_parent_fid(dentry);
847 if (IS_ERR(dfid)) {
848 err = PTR_ERR(dfid);
849 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
850 goto error;
851 }
852
853 gid = v9fs_get_fsgid_for_create(dir);
854 mode = omode;
855 /* Update mode based on ACL value */
856 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
857 if (err) {
858 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
859 err);
860 goto error;
861 }
862 name = dentry->d_name.name;
863
864 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
865 if (err < 0)
866 goto error;
867
868 v9fs_invalidate_inode_attr(dir);
869 fid = p9_client_walk(dfid, 1, &name, 1);
870 if (IS_ERR(fid)) {
871 err = PTR_ERR(fid);
872 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
873 err);
874 goto error;
875 }
876
877 /* instantiate inode and assign the unopened fid to the dentry */
878 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
879 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
880 if (IS_ERR(inode)) {
881 err = PTR_ERR(inode);
882 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
883 err);
884 goto error;
885 }
886 v9fs_set_create_acl(inode, fid, dacl, pacl);
887 v9fs_fid_add(dentry, &fid);
888 d_instantiate(dentry, inode);
889 err = 0;
890 } else {
891 /*
892 * Not in cached mode. No need to populate inode with stat.
893 * socket syscall returns a fd, so we need instantiate
894 */
895 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
896 if (IS_ERR(inode)) {
897 err = PTR_ERR(inode);
898 goto error;
899 }
900 v9fs_set_create_acl(inode, fid, dacl, pacl);
901 d_instantiate(dentry, inode);
902 }
903error:
904 p9_fid_put(fid);
905 v9fs_put_acl(dacl, pacl);
906 p9_fid_put(dfid);
907
908 return err;
909}
910
911/**
912 * v9fs_vfs_get_link_dotl - follow a symlink path
913 * @dentry: dentry for symlink
914 * @inode: inode for symlink
915 * @done: destructor for return value
916 */
917
918static const char *
919v9fs_vfs_get_link_dotl(struct dentry *dentry,
920 struct inode *inode,
921 struct delayed_call *done)
922{
923 struct p9_fid *fid;
924 char *target;
925 int retval;
926
927 if (!dentry)
928 return ERR_PTR(-ECHILD);
929
930 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
931
932 fid = v9fs_fid_lookup(dentry);
933 if (IS_ERR(fid))
934 return ERR_CAST(fid);
935 retval = p9_client_readlink(fid, &target);
936 p9_fid_put(fid);
937 if (retval)
938 return ERR_PTR(retval);
939 set_delayed_call(done, kfree_link, target);
940 return target;
941}
942
943int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
944{
945 struct p9_stat_dotl *st;
946 struct v9fs_session_info *v9ses;
947 unsigned int flags;
948
949 v9ses = v9fs_inode2v9ses(inode);
950 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
951 if (IS_ERR(st))
952 return PTR_ERR(st);
953 /*
954 * Don't update inode if the file type is different
955 */
956 if (inode_wrong_type(inode, st->st_mode))
957 goto out;
958
959 /*
960 * We don't want to refresh inode->i_size,
961 * because we may have cached data
962 */
963 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
964 V9FS_STAT2INODE_KEEP_ISIZE : 0;
965 v9fs_stat2inode_dotl(st, inode, flags);
966out:
967 kfree(st);
968 return 0;
969}
970
971const struct inode_operations v9fs_dir_inode_operations_dotl = {
972 .create = v9fs_vfs_create_dotl,
973 .atomic_open = v9fs_vfs_atomic_open_dotl,
974 .lookup = v9fs_vfs_lookup,
975 .link = v9fs_vfs_link_dotl,
976 .symlink = v9fs_vfs_symlink_dotl,
977 .unlink = v9fs_vfs_unlink,
978 .mkdir = v9fs_vfs_mkdir_dotl,
979 .rmdir = v9fs_vfs_rmdir,
980 .mknod = v9fs_vfs_mknod_dotl,
981 .rename = v9fs_vfs_rename,
982 .getattr = v9fs_vfs_getattr_dotl,
983 .setattr = v9fs_vfs_setattr_dotl,
984 .listxattr = v9fs_listxattr,
985 .get_inode_acl = v9fs_iop_get_inode_acl,
986 .get_acl = v9fs_iop_get_acl,
987 .set_acl = v9fs_iop_set_acl,
988};
989
990const struct inode_operations v9fs_file_inode_operations_dotl = {
991 .getattr = v9fs_vfs_getattr_dotl,
992 .setattr = v9fs_vfs_setattr_dotl,
993 .listxattr = v9fs_listxattr,
994 .get_inode_acl = v9fs_iop_get_inode_acl,
995 .get_acl = v9fs_iop_get_acl,
996 .set_acl = v9fs_iop_set_acl,
997};
998
999const struct inode_operations v9fs_symlink_inode_operations_dotl = {
1000 .get_link = v9fs_vfs_get_link_dotl,
1001 .getattr = v9fs_vfs_getattr_dotl,
1002 .setattr = v9fs_vfs_setattr_dotl,
1003 .listxattr = v9fs_listxattr,
1004};
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};