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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
55
56
57struct inode *
58v9fs_fid_iget_dotl(struct super_block *sb, struct p9_fid *fid, bool new)
59{
60 int retval;
61 struct inode *inode;
62 struct p9_stat_dotl *st;
63 struct v9fs_session_info *v9ses = sb->s_fs_info;
64
65 inode = iget_locked(sb, QID2INO(&fid->qid));
66 if (unlikely(!inode))
67 return ERR_PTR(-ENOMEM);
68 if (!(inode->i_state & I_NEW)) {
69 if (!new) {
70 goto done;
71 } else { /* deal with race condition in inode number reuse */
72 p9_debug(P9_DEBUG_ERROR, "WARNING: Inode collision %lx\n",
73 inode->i_ino);
74 iput(inode);
75 remove_inode_hash(inode);
76 inode = iget_locked(sb, QID2INO(&fid->qid));
77 WARN_ON(!(inode->i_state & I_NEW));
78 }
79 }
80
81 /*
82 * initialize the inode with the stat info
83 * FIXME!! we may need support for stale inodes
84 * later.
85 */
86 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
87 if (IS_ERR(st)) {
88 retval = PTR_ERR(st);
89 goto error;
90 }
91
92 retval = v9fs_init_inode(v9ses, inode, &fid->qid,
93 st->st_mode, new_decode_dev(st->st_rdev));
94 v9fs_stat2inode_dotl(st, inode, 0);
95 kfree(st);
96 if (retval)
97 goto error;
98
99 v9fs_set_netfs_context(inode);
100 v9fs_cache_inode_get_cookie(inode);
101 retval = v9fs_get_acl(inode, fid);
102 if (retval)
103 goto error;
104
105 unlock_new_inode(inode);
106done:
107 return inode;
108error:
109 iget_failed(inode);
110 return ERR_PTR(retval);
111}
112
113struct dotl_openflag_map {
114 int open_flag;
115 int dotl_flag;
116};
117
118static int v9fs_mapped_dotl_flags(int flags)
119{
120 int i;
121 int rflags = 0;
122 struct dotl_openflag_map dotl_oflag_map[] = {
123 { O_CREAT, P9_DOTL_CREATE },
124 { O_EXCL, P9_DOTL_EXCL },
125 { O_NOCTTY, P9_DOTL_NOCTTY },
126 { O_APPEND, P9_DOTL_APPEND },
127 { O_NONBLOCK, P9_DOTL_NONBLOCK },
128 { O_DSYNC, P9_DOTL_DSYNC },
129 { FASYNC, P9_DOTL_FASYNC },
130 { O_DIRECT, P9_DOTL_DIRECT },
131 { O_LARGEFILE, P9_DOTL_LARGEFILE },
132 { O_DIRECTORY, P9_DOTL_DIRECTORY },
133 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
134 { O_NOATIME, P9_DOTL_NOATIME },
135 { O_CLOEXEC, P9_DOTL_CLOEXEC },
136 { O_SYNC, P9_DOTL_SYNC},
137 };
138 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
139 if (flags & dotl_oflag_map[i].open_flag)
140 rflags |= dotl_oflag_map[i].dotl_flag;
141 }
142 return rflags;
143}
144
145/**
146 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
147 * plan 9 open flag.
148 * @flags: flags to convert
149 */
150int v9fs_open_to_dotl_flags(int flags)
151{
152 int rflags = 0;
153
154 /*
155 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
156 * and P9_DOTL_NOACCESS
157 */
158 rflags |= flags & O_ACCMODE;
159 rflags |= v9fs_mapped_dotl_flags(flags);
160
161 return rflags;
162}
163
164/**
165 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
166 * @idmap: The user namespace of the mount
167 * @dir: directory inode that is being created
168 * @dentry: dentry that is being deleted
169 * @omode: create permissions
170 * @excl: True if the file must not yet exist
171 *
172 */
173static int
174v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir,
175 struct dentry *dentry, umode_t omode, bool excl)
176{
177 return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0);
178}
179
180static int
181v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
182 struct file *file, unsigned int flags, umode_t omode)
183{
184 int err = 0;
185 kgid_t gid;
186 umode_t mode;
187 int p9_omode = v9fs_open_to_dotl_flags(flags);
188 const unsigned char *name = NULL;
189 struct p9_qid qid;
190 struct inode *inode;
191 struct p9_fid *fid = NULL;
192 struct p9_fid *dfid = NULL, *ofid = NULL;
193 struct v9fs_session_info *v9ses;
194 struct posix_acl *pacl = NULL, *dacl = NULL;
195 struct dentry *res = NULL;
196
197 if (d_in_lookup(dentry)) {
198 res = v9fs_vfs_lookup(dir, dentry, 0);
199 if (IS_ERR(res))
200 return PTR_ERR(res);
201
202 if (res)
203 dentry = res;
204 }
205
206 /* Only creates */
207 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
208 return finish_no_open(file, res);
209
210 v9ses = v9fs_inode2v9ses(dir);
211
212 name = dentry->d_name.name;
213 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n",
214 name, flags, omode);
215
216 dfid = v9fs_parent_fid(dentry);
217 if (IS_ERR(dfid)) {
218 err = PTR_ERR(dfid);
219 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
220 goto out;
221 }
222
223 /* clone a fid to use for creation */
224 ofid = clone_fid(dfid);
225 if (IS_ERR(ofid)) {
226 err = PTR_ERR(ofid);
227 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
228 goto out;
229 }
230
231 gid = v9fs_get_fsgid_for_create(dir);
232
233 mode = omode;
234 /* Update mode based on ACL value */
235 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
236 if (err) {
237 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n",
238 err);
239 goto out;
240 }
241
242 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
243 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
244 p9_debug(P9_DEBUG_CACHE,
245 "write-only file with writeback enabled, creating w/ O_RDWR\n");
246 }
247 err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid);
248 if (err < 0) {
249 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n",
250 err);
251 goto out;
252 }
253 v9fs_invalidate_inode_attr(dir);
254
255 /* instantiate inode and assign the unopened fid to the dentry */
256 fid = p9_client_walk(dfid, 1, &name, 1);
257 if (IS_ERR(fid)) {
258 err = PTR_ERR(fid);
259 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
260 goto out;
261 }
262 inode = v9fs_fid_iget_dotl(dir->i_sb, fid, true);
263 if (IS_ERR(inode)) {
264 err = PTR_ERR(inode);
265 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
266 goto out;
267 }
268 /* Now set the ACL based on the default value */
269 v9fs_set_create_acl(inode, fid, dacl, pacl);
270
271 v9fs_fid_add(dentry, &fid);
272 d_instantiate(dentry, inode);
273
274 /* Since we are opening a file, assign the open fid to the file */
275 err = finish_open(file, dentry, generic_file_open);
276 if (err)
277 goto out;
278 file->private_data = ofid;
279#ifdef CONFIG_9P_FSCACHE
280 if (v9ses->cache & CACHE_FSCACHE) {
281 struct v9fs_inode *v9inode = V9FS_I(inode);
282 fscache_use_cookie(v9fs_inode_cookie(v9inode),
283 file->f_mode & FMODE_WRITE);
284 }
285#endif
286 v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags);
287 v9fs_open_fid_add(inode, &ofid);
288 file->f_mode |= FMODE_CREATED;
289out:
290 p9_fid_put(dfid);
291 p9_fid_put(ofid);
292 p9_fid_put(fid);
293 v9fs_put_acl(dacl, pacl);
294 dput(res);
295 return err;
296}
297
298/**
299 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
300 * @idmap: The idmap of the mount
301 * @dir: inode that is being unlinked
302 * @dentry: dentry that is being unlinked
303 * @omode: mode for new directory
304 *
305 */
306
307static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
308 struct inode *dir, struct dentry *dentry,
309 umode_t omode)
310{
311 int err;
312 struct p9_fid *fid = NULL, *dfid = NULL;
313 kgid_t gid;
314 const unsigned char *name;
315 umode_t mode;
316 struct inode *inode;
317 struct p9_qid qid;
318 struct posix_acl *dacl = NULL, *pacl = NULL;
319
320 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
321
322 omode |= S_IFDIR;
323 if (dir->i_mode & S_ISGID)
324 omode |= S_ISGID;
325
326 dfid = v9fs_parent_fid(dentry);
327 if (IS_ERR(dfid)) {
328 err = PTR_ERR(dfid);
329 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
330 goto error;
331 }
332
333 gid = v9fs_get_fsgid_for_create(dir);
334 mode = omode;
335 /* Update mode based on ACL value */
336 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
337 if (err) {
338 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
339 err);
340 goto error;
341 }
342 name = dentry->d_name.name;
343 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
344 if (err < 0)
345 goto error;
346 fid = p9_client_walk(dfid, 1, &name, 1);
347 if (IS_ERR(fid)) {
348 err = PTR_ERR(fid);
349 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
350 err);
351 goto error;
352 }
353
354 /* instantiate inode and assign the unopened fid to the dentry */
355 inode = v9fs_fid_iget_dotl(dir->i_sb, fid, true);
356 if (IS_ERR(inode)) {
357 err = PTR_ERR(inode);
358 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
359 err);
360 goto error;
361 }
362 v9fs_fid_add(dentry, &fid);
363 v9fs_set_create_acl(inode, fid, dacl, pacl);
364 d_instantiate(dentry, inode);
365 err = 0;
366 inc_nlink(dir);
367 v9fs_invalidate_inode_attr(dir);
368error:
369 p9_fid_put(fid);
370 v9fs_put_acl(dacl, pacl);
371 p9_fid_put(dfid);
372 return err;
373}
374
375static int
376v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap,
377 const struct path *path, struct kstat *stat,
378 u32 request_mask, unsigned int flags)
379{
380 struct dentry *dentry = path->dentry;
381 struct v9fs_session_info *v9ses;
382 struct p9_fid *fid;
383 struct inode *inode = d_inode(dentry);
384 struct p9_stat_dotl *st;
385
386 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
387 v9ses = v9fs_dentry2v9ses(dentry);
388 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
389 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
390 return 0;
391 } else if (v9ses->cache) {
392 if (S_ISREG(inode->i_mode)) {
393 int retval = filemap_fdatawrite(inode->i_mapping);
394
395 if (retval)
396 p9_debug(P9_DEBUG_ERROR,
397 "flushing writeback during getattr returned %d\n", retval);
398 }
399 }
400 fid = v9fs_fid_lookup(dentry);
401 if (IS_ERR(fid))
402 return PTR_ERR(fid);
403
404 /* Ask for all the fields in stat structure. Server will return
405 * whatever it supports
406 */
407
408 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
409 p9_fid_put(fid);
410 if (IS_ERR(st))
411 return PTR_ERR(st);
412
413 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
414 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat);
415 /* Change block size to what the server returned */
416 stat->blksize = st->st_blksize;
417
418 kfree(st);
419 return 0;
420}
421
422/*
423 * Attribute flags.
424 */
425#define P9_ATTR_MODE (1 << 0)
426#define P9_ATTR_UID (1 << 1)
427#define P9_ATTR_GID (1 << 2)
428#define P9_ATTR_SIZE (1 << 3)
429#define P9_ATTR_ATIME (1 << 4)
430#define P9_ATTR_MTIME (1 << 5)
431#define P9_ATTR_CTIME (1 << 6)
432#define P9_ATTR_ATIME_SET (1 << 7)
433#define P9_ATTR_MTIME_SET (1 << 8)
434
435struct dotl_iattr_map {
436 int iattr_valid;
437 int p9_iattr_valid;
438};
439
440static int v9fs_mapped_iattr_valid(int iattr_valid)
441{
442 int i;
443 int p9_iattr_valid = 0;
444 struct dotl_iattr_map dotl_iattr_map[] = {
445 { ATTR_MODE, P9_ATTR_MODE },
446 { ATTR_UID, P9_ATTR_UID },
447 { ATTR_GID, P9_ATTR_GID },
448 { ATTR_SIZE, P9_ATTR_SIZE },
449 { ATTR_ATIME, P9_ATTR_ATIME },
450 { ATTR_MTIME, P9_ATTR_MTIME },
451 { ATTR_CTIME, P9_ATTR_CTIME },
452 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
453 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
454 };
455 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
456 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
457 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
458 }
459 return p9_iattr_valid;
460}
461
462/**
463 * v9fs_vfs_setattr_dotl - set file metadata
464 * @idmap: idmap of the mount
465 * @dentry: file whose metadata to set
466 * @iattr: metadata assignment structure
467 *
468 */
469
470int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap,
471 struct dentry *dentry, struct iattr *iattr)
472{
473 int retval, use_dentry = 0;
474 struct inode *inode = d_inode(dentry);
475 struct v9fs_session_info __maybe_unused *v9ses;
476 struct p9_fid *fid = NULL;
477 struct p9_iattr_dotl p9attr = {
478 .uid = INVALID_UID,
479 .gid = INVALID_GID,
480 };
481
482 p9_debug(P9_DEBUG_VFS, "\n");
483
484 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
485 if (retval)
486 return retval;
487
488 v9ses = v9fs_dentry2v9ses(dentry);
489
490 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
491 if (iattr->ia_valid & ATTR_MODE)
492 p9attr.mode = iattr->ia_mode;
493 if (iattr->ia_valid & ATTR_UID)
494 p9attr.uid = iattr->ia_uid;
495 if (iattr->ia_valid & ATTR_GID)
496 p9attr.gid = iattr->ia_gid;
497 if (iattr->ia_valid & ATTR_SIZE)
498 p9attr.size = iattr->ia_size;
499 if (iattr->ia_valid & ATTR_ATIME_SET) {
500 p9attr.atime_sec = iattr->ia_atime.tv_sec;
501 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
502 }
503 if (iattr->ia_valid & ATTR_MTIME_SET) {
504 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
505 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
506 }
507
508 if (iattr->ia_valid & ATTR_FILE) {
509 fid = iattr->ia_file->private_data;
510 WARN_ON(!fid);
511 }
512 if (!fid) {
513 fid = v9fs_fid_lookup(dentry);
514 use_dentry = 1;
515 }
516 if (IS_ERR(fid))
517 return PTR_ERR(fid);
518
519 /* Write all dirty data */
520 if (S_ISREG(inode->i_mode)) {
521 retval = filemap_fdatawrite(inode->i_mapping);
522 if (retval < 0)
523 p9_debug(P9_DEBUG_ERROR,
524 "Flushing file prior to setattr failed: %d\n", retval);
525 }
526
527 retval = p9_client_setattr(fid, &p9attr);
528 if (retval < 0) {
529 if (use_dentry)
530 p9_fid_put(fid);
531 return retval;
532 }
533
534 if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size !=
535 i_size_read(inode)) {
536 truncate_setsize(inode, iattr->ia_size);
537 netfs_resize_file(netfs_inode(inode), iattr->ia_size, true);
538
539#ifdef CONFIG_9P_FSCACHE
540 if (v9ses->cache & CACHE_FSCACHE)
541 fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)),
542 iattr->ia_size);
543#endif
544 }
545
546 v9fs_invalidate_inode_attr(inode);
547 setattr_copy(&nop_mnt_idmap, inode, iattr);
548 mark_inode_dirty(inode);
549 if (iattr->ia_valid & ATTR_MODE) {
550 /* We also want to update ACL when we update mode bits */
551 retval = v9fs_acl_chmod(inode, fid);
552 if (retval < 0) {
553 if (use_dentry)
554 p9_fid_put(fid);
555 return retval;
556 }
557 }
558 if (use_dentry)
559 p9_fid_put(fid);
560
561 return 0;
562}
563
564/**
565 * v9fs_stat2inode_dotl - populate an inode structure with stat info
566 * @stat: stat structure
567 * @inode: inode to populate
568 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
569 *
570 */
571
572void
573v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
574 unsigned int flags)
575{
576 umode_t mode;
577 struct v9fs_inode *v9inode = V9FS_I(inode);
578
579 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
580 inode_set_atime(inode, stat->st_atime_sec,
581 stat->st_atime_nsec);
582 inode_set_mtime(inode, stat->st_mtime_sec,
583 stat->st_mtime_nsec);
584 inode_set_ctime(inode, stat->st_ctime_sec,
585 stat->st_ctime_nsec);
586 inode->i_uid = stat->st_uid;
587 inode->i_gid = stat->st_gid;
588 set_nlink(inode, stat->st_nlink);
589
590 mode = stat->st_mode & S_IALLUGO;
591 mode |= inode->i_mode & ~S_IALLUGO;
592 inode->i_mode = mode;
593
594 v9inode->netfs.remote_i_size = stat->st_size;
595 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
596 v9fs_i_size_write(inode, stat->st_size);
597 inode->i_blocks = stat->st_blocks;
598 } else {
599 if (stat->st_result_mask & P9_STATS_ATIME) {
600 inode_set_atime(inode, stat->st_atime_sec,
601 stat->st_atime_nsec);
602 }
603 if (stat->st_result_mask & P9_STATS_MTIME) {
604 inode_set_mtime(inode, stat->st_mtime_sec,
605 stat->st_mtime_nsec);
606 }
607 if (stat->st_result_mask & P9_STATS_CTIME) {
608 inode_set_ctime(inode, stat->st_ctime_sec,
609 stat->st_ctime_nsec);
610 }
611 if (stat->st_result_mask & P9_STATS_UID)
612 inode->i_uid = stat->st_uid;
613 if (stat->st_result_mask & P9_STATS_GID)
614 inode->i_gid = stat->st_gid;
615 if (stat->st_result_mask & P9_STATS_NLINK)
616 set_nlink(inode, stat->st_nlink);
617 if (stat->st_result_mask & P9_STATS_MODE) {
618 mode = stat->st_mode & S_IALLUGO;
619 mode |= inode->i_mode & ~S_IALLUGO;
620 inode->i_mode = mode;
621 }
622 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
623 stat->st_result_mask & P9_STATS_SIZE) {
624 v9inode->netfs.remote_i_size = stat->st_size;
625 v9fs_i_size_write(inode, stat->st_size);
626 }
627 if (stat->st_result_mask & P9_STATS_BLOCKS)
628 inode->i_blocks = stat->st_blocks;
629 }
630 if (stat->st_result_mask & P9_STATS_GEN)
631 inode->i_generation = stat->st_gen;
632
633 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
634 * because the inode structure does not have fields for them.
635 */
636 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
637}
638
639static int
640v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir,
641 struct dentry *dentry, const char *symname)
642{
643 int err;
644 kgid_t gid;
645 const unsigned char *name;
646 struct p9_qid qid;
647 struct p9_fid *dfid;
648 struct p9_fid *fid = NULL;
649
650 name = dentry->d_name.name;
651 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
652
653 dfid = v9fs_parent_fid(dentry);
654 if (IS_ERR(dfid)) {
655 err = PTR_ERR(dfid);
656 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
657 return err;
658 }
659
660 gid = v9fs_get_fsgid_for_create(dir);
661
662 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
663 err = p9_client_symlink(dfid, name, symname, gid, &qid);
664
665 if (err < 0) {
666 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
667 goto error;
668 }
669
670 v9fs_invalidate_inode_attr(dir);
671
672error:
673 p9_fid_put(fid);
674 p9_fid_put(dfid);
675 return err;
676}
677
678/**
679 * v9fs_vfs_link_dotl - create a hardlink for dotl
680 * @old_dentry: dentry for file to link to
681 * @dir: inode destination for new link
682 * @dentry: dentry for link
683 *
684 */
685
686static int
687v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
688 struct dentry *dentry)
689{
690 int err;
691 struct p9_fid *dfid, *oldfid;
692 struct v9fs_session_info *v9ses;
693
694 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
695 dir->i_ino, old_dentry, dentry);
696
697 v9ses = v9fs_inode2v9ses(dir);
698 dfid = v9fs_parent_fid(dentry);
699 if (IS_ERR(dfid))
700 return PTR_ERR(dfid);
701
702 oldfid = v9fs_fid_lookup(old_dentry);
703 if (IS_ERR(oldfid)) {
704 p9_fid_put(dfid);
705 return PTR_ERR(oldfid);
706 }
707
708 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
709
710 p9_fid_put(dfid);
711 p9_fid_put(oldfid);
712 if (err < 0) {
713 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
714 return err;
715 }
716
717 v9fs_invalidate_inode_attr(dir);
718 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
719 /* Get the latest stat info from server. */
720 struct p9_fid *fid;
721
722 fid = v9fs_fid_lookup(old_dentry);
723 if (IS_ERR(fid))
724 return PTR_ERR(fid);
725
726 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
727 p9_fid_put(fid);
728 }
729 ihold(d_inode(old_dentry));
730 d_instantiate(dentry, d_inode(old_dentry));
731
732 return err;
733}
734
735/**
736 * v9fs_vfs_mknod_dotl - create a special file
737 * @idmap: The idmap of the mount
738 * @dir: inode destination for new link
739 * @dentry: dentry for file
740 * @omode: mode for creation
741 * @rdev: device associated with special file
742 *
743 */
744static int
745v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
746 struct dentry *dentry, umode_t omode, dev_t rdev)
747{
748 int err;
749 kgid_t gid;
750 const unsigned char *name;
751 umode_t mode;
752 struct p9_fid *fid = NULL, *dfid = NULL;
753 struct inode *inode;
754 struct p9_qid qid;
755 struct posix_acl *dacl = NULL, *pacl = NULL;
756
757 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
758 dir->i_ino, dentry, omode,
759 MAJOR(rdev), MINOR(rdev));
760
761 dfid = v9fs_parent_fid(dentry);
762 if (IS_ERR(dfid)) {
763 err = PTR_ERR(dfid);
764 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
765 goto error;
766 }
767
768 gid = v9fs_get_fsgid_for_create(dir);
769 mode = omode;
770 /* Update mode based on ACL value */
771 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
772 if (err) {
773 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
774 err);
775 goto error;
776 }
777 name = dentry->d_name.name;
778
779 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
780 if (err < 0)
781 goto error;
782
783 v9fs_invalidate_inode_attr(dir);
784 fid = p9_client_walk(dfid, 1, &name, 1);
785 if (IS_ERR(fid)) {
786 err = PTR_ERR(fid);
787 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
788 err);
789 goto error;
790 }
791 inode = v9fs_fid_iget_dotl(dir->i_sb, fid, true);
792 if (IS_ERR(inode)) {
793 err = PTR_ERR(inode);
794 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
795 err);
796 goto error;
797 }
798 v9fs_set_create_acl(inode, fid, dacl, pacl);
799 v9fs_fid_add(dentry, &fid);
800 d_instantiate(dentry, inode);
801 err = 0;
802error:
803 p9_fid_put(fid);
804 v9fs_put_acl(dacl, pacl);
805 p9_fid_put(dfid);
806
807 return err;
808}
809
810/**
811 * v9fs_vfs_get_link_dotl - follow a symlink path
812 * @dentry: dentry for symlink
813 * @inode: inode for symlink
814 * @done: destructor for return value
815 */
816
817static const char *
818v9fs_vfs_get_link_dotl(struct dentry *dentry,
819 struct inode *inode,
820 struct delayed_call *done)
821{
822 struct p9_fid *fid;
823 char *target;
824 int retval;
825
826 if (!dentry)
827 return ERR_PTR(-ECHILD);
828
829 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
830
831 fid = v9fs_fid_lookup(dentry);
832 if (IS_ERR(fid))
833 return ERR_CAST(fid);
834 retval = p9_client_readlink(fid, &target);
835 p9_fid_put(fid);
836 if (retval)
837 return ERR_PTR(retval);
838 set_delayed_call(done, kfree_link, target);
839 return target;
840}
841
842int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
843{
844 struct p9_stat_dotl *st;
845 struct v9fs_session_info *v9ses;
846 unsigned int flags;
847
848 v9ses = v9fs_inode2v9ses(inode);
849 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
850 if (IS_ERR(st))
851 return PTR_ERR(st);
852 /*
853 * Don't update inode if the file type is different
854 */
855 if (inode_wrong_type(inode, st->st_mode))
856 goto out;
857
858 /*
859 * We don't want to refresh inode->i_size,
860 * because we may have cached data
861 */
862 flags = (v9ses->cache & CACHE_LOOSE) ?
863 V9FS_STAT2INODE_KEEP_ISIZE : 0;
864 v9fs_stat2inode_dotl(st, inode, flags);
865out:
866 kfree(st);
867 return 0;
868}
869
870const struct inode_operations v9fs_dir_inode_operations_dotl = {
871 .create = v9fs_vfs_create_dotl,
872 .atomic_open = v9fs_vfs_atomic_open_dotl,
873 .lookup = v9fs_vfs_lookup,
874 .link = v9fs_vfs_link_dotl,
875 .symlink = v9fs_vfs_symlink_dotl,
876 .unlink = v9fs_vfs_unlink,
877 .mkdir = v9fs_vfs_mkdir_dotl,
878 .rmdir = v9fs_vfs_rmdir,
879 .mknod = v9fs_vfs_mknod_dotl,
880 .rename = v9fs_vfs_rename,
881 .getattr = v9fs_vfs_getattr_dotl,
882 .setattr = v9fs_vfs_setattr_dotl,
883 .listxattr = v9fs_listxattr,
884 .get_inode_acl = v9fs_iop_get_inode_acl,
885 .get_acl = v9fs_iop_get_acl,
886 .set_acl = v9fs_iop_set_acl,
887};
888
889const struct inode_operations v9fs_file_inode_operations_dotl = {
890 .getattr = v9fs_vfs_getattr_dotl,
891 .setattr = v9fs_vfs_setattr_dotl,
892 .listxattr = v9fs_listxattr,
893 .get_inode_acl = v9fs_iop_get_inode_acl,
894 .get_acl = v9fs_iop_get_acl,
895 .set_acl = v9fs_iop_set_acl,
896};
897
898const struct inode_operations v9fs_symlink_inode_operations_dotl = {
899 .get_link = v9fs_vfs_get_link_dotl,
900 .getattr = v9fs_vfs_getattr_dotl,
901 .setattr = v9fs_vfs_setattr_dotl,
902 .listxattr = v9fs_listxattr,
903};