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1/*
2 * linux/fs/9p/vfs_inode_dotl.c
3 *
4 * This file contains vfs inode ops for the 9P2000.L protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/file.h>
30#include <linux/pagemap.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/inet.h>
34#include <linux/namei.h>
35#include <linux/idr.h>
36#include <linux/sched.h>
37#include <linux/slab.h>
38#include <linux/xattr.h>
39#include <linux/posix_acl.h>
40#include <net/9p/9p.h>
41#include <net/9p/client.h>
42
43#include "v9fs.h"
44#include "v9fs_vfs.h"
45#include "fid.h"
46#include "cache.h"
47#include "xattr.h"
48#include "acl.h"
49
50static int
51v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
52 dev_t rdev);
53
54/**
55 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
56 * new file system object. This checks the S_ISGID to determine the owning
57 * group of the new file system object.
58 */
59
60static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
61{
62 BUG_ON(dir_inode == NULL);
63
64 if (dir_inode->i_mode & S_ISGID) {
65 /* set_gid bit is set.*/
66 return dir_inode->i_gid;
67 }
68 return current_fsgid();
69}
70
71/**
72 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
73 * dir inode.
74 *
75 */
76
77static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
78{
79 struct dentry *dentry;
80
81 spin_lock(&inode->i_lock);
82 /* Directory should have only one entry. */
83 BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
84 dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
85 spin_unlock(&inode->i_lock);
86 return dentry;
87}
88
89static int v9fs_test_inode_dotl(struct inode *inode, void *data)
90{
91 struct v9fs_inode *v9inode = V9FS_I(inode);
92 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
93
94 /* don't match inode of different type */
95 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
96 return 0;
97
98 if (inode->i_generation != st->st_gen)
99 return 0;
100
101 /* compare qid details */
102 if (memcmp(&v9inode->qid.version,
103 &st->qid.version, sizeof(v9inode->qid.version)))
104 return 0;
105
106 if (v9inode->qid.type != st->qid.type)
107 return 0;
108 return 1;
109}
110
111/* Always get a new inode */
112static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
113{
114 return 0;
115}
116
117static int v9fs_set_inode_dotl(struct inode *inode, void *data)
118{
119 struct v9fs_inode *v9inode = V9FS_I(inode);
120 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
121
122 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
123 inode->i_generation = st->st_gen;
124 return 0;
125}
126
127static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
128 struct p9_qid *qid,
129 struct p9_fid *fid,
130 struct p9_stat_dotl *st,
131 int new)
132{
133 int retval;
134 unsigned long i_ino;
135 struct inode *inode;
136 struct v9fs_session_info *v9ses = sb->s_fs_info;
137 int (*test)(struct inode *, void *);
138
139 if (new)
140 test = v9fs_test_new_inode_dotl;
141 else
142 test = v9fs_test_inode_dotl;
143
144 i_ino = v9fs_qid2ino(qid);
145 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
146 if (!inode)
147 return ERR_PTR(-ENOMEM);
148 if (!(inode->i_state & I_NEW))
149 return inode;
150 /*
151 * initialize the inode with the stat info
152 * FIXME!! we may need support for stale inodes
153 * later.
154 */
155 inode->i_ino = i_ino;
156 retval = v9fs_init_inode(v9ses, inode,
157 st->st_mode, new_decode_dev(st->st_rdev));
158 if (retval)
159 goto error;
160
161 v9fs_stat2inode_dotl(st, inode);
162#ifdef CONFIG_9P_FSCACHE
163 v9fs_cache_inode_get_cookie(inode);
164#endif
165 retval = v9fs_get_acl(inode, fid);
166 if (retval)
167 goto error;
168
169 unlock_new_inode(inode);
170 return inode;
171error:
172 unlock_new_inode(inode);
173 iput(inode);
174 return ERR_PTR(retval);
175
176}
177
178struct inode *
179v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
180 struct super_block *sb, int new)
181{
182 struct p9_stat_dotl *st;
183 struct inode *inode = NULL;
184
185 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
186 if (IS_ERR(st))
187 return ERR_CAST(st);
188
189 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
190 kfree(st);
191 return inode;
192}
193
194struct dotl_openflag_map {
195 int open_flag;
196 int dotl_flag;
197};
198
199static int v9fs_mapped_dotl_flags(int flags)
200{
201 int i;
202 int rflags = 0;
203 struct dotl_openflag_map dotl_oflag_map[] = {
204 { O_CREAT, P9_DOTL_CREATE },
205 { O_EXCL, P9_DOTL_EXCL },
206 { O_NOCTTY, P9_DOTL_NOCTTY },
207 { O_TRUNC, P9_DOTL_TRUNC },
208 { O_APPEND, P9_DOTL_APPEND },
209 { O_NONBLOCK, P9_DOTL_NONBLOCK },
210 { O_DSYNC, P9_DOTL_DSYNC },
211 { FASYNC, P9_DOTL_FASYNC },
212 { O_DIRECT, P9_DOTL_DIRECT },
213 { O_LARGEFILE, P9_DOTL_LARGEFILE },
214 { O_DIRECTORY, P9_DOTL_DIRECTORY },
215 { O_NOFOLLOW, P9_DOTL_NOFOLLOW },
216 { O_NOATIME, P9_DOTL_NOATIME },
217 { O_CLOEXEC, P9_DOTL_CLOEXEC },
218 { O_SYNC, P9_DOTL_SYNC},
219 };
220 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
221 if (flags & dotl_oflag_map[i].open_flag)
222 rflags |= dotl_oflag_map[i].dotl_flag;
223 }
224 return rflags;
225}
226
227/**
228 * v9fs_open_to_dotl_flags- convert Linux specific open flags to
229 * plan 9 open flag.
230 * @flags: flags to convert
231 */
232int v9fs_open_to_dotl_flags(int flags)
233{
234 int rflags = 0;
235
236 /*
237 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
238 * and P9_DOTL_NOACCESS
239 */
240 rflags |= flags & O_ACCMODE;
241 rflags |= v9fs_mapped_dotl_flags(flags);
242
243 return rflags;
244}
245
246/**
247 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
248 * @dir: directory inode that is being created
249 * @dentry: dentry that is being deleted
250 * @mode: create permissions
251 * @nd: path information
252 *
253 */
254
255static int
256v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
257 struct nameidata *nd)
258{
259 int err = 0;
260 gid_t gid;
261 int flags;
262 umode_t mode;
263 char *name = NULL;
264 struct file *filp;
265 struct p9_qid qid;
266 struct inode *inode;
267 struct p9_fid *fid = NULL;
268 struct v9fs_inode *v9inode;
269 struct p9_fid *dfid, *ofid, *inode_fid;
270 struct v9fs_session_info *v9ses;
271 struct posix_acl *pacl = NULL, *dacl = NULL;
272
273 v9ses = v9fs_inode2v9ses(dir);
274 if (nd)
275 flags = nd->intent.open.flags;
276 else {
277 /*
278 * create call without LOOKUP_OPEN is due
279 * to mknod of regular files. So use mknod
280 * operation.
281 */
282 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
283 }
284
285 name = (char *) dentry->d_name.name;
286 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
287 "mode:0x%x\n", name, flags, omode);
288
289 dfid = v9fs_fid_lookup(dentry->d_parent);
290 if (IS_ERR(dfid)) {
291 err = PTR_ERR(dfid);
292 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
293 return err;
294 }
295
296 /* clone a fid to use for creation */
297 ofid = p9_client_walk(dfid, 0, NULL, 1);
298 if (IS_ERR(ofid)) {
299 err = PTR_ERR(ofid);
300 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
301 return err;
302 }
303
304 gid = v9fs_get_fsgid_for_create(dir);
305
306 mode = omode;
307 /* Update mode based on ACL value */
308 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
309 if (err) {
310 P9_DPRINTK(P9_DEBUG_VFS,
311 "Failed to get acl values in creat %d\n", err);
312 goto error;
313 }
314 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
315 mode, gid, &qid);
316 if (err < 0) {
317 P9_DPRINTK(P9_DEBUG_VFS,
318 "p9_client_open_dotl failed in creat %d\n",
319 err);
320 goto error;
321 }
322 v9fs_invalidate_inode_attr(dir);
323
324 /* instantiate inode and assign the unopened fid to the dentry */
325 fid = p9_client_walk(dfid, 1, &name, 1);
326 if (IS_ERR(fid)) {
327 err = PTR_ERR(fid);
328 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
329 fid = NULL;
330 goto error;
331 }
332 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
333 if (IS_ERR(inode)) {
334 err = PTR_ERR(inode);
335 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
336 goto error;
337 }
338 err = v9fs_fid_add(dentry, fid);
339 if (err < 0)
340 goto error;
341 d_instantiate(dentry, inode);
342
343 /* Now set the ACL based on the default value */
344 v9fs_set_create_acl(dentry, &dacl, &pacl);
345
346 v9inode = V9FS_I(inode);
347 mutex_lock(&v9inode->v_mutex);
348 if (v9ses->cache && !v9inode->writeback_fid &&
349 ((flags & O_ACCMODE) != O_RDONLY)) {
350 /*
351 * clone a fid and add it to writeback_fid
352 * we do it during open time instead of
353 * page dirty time via write_begin/page_mkwrite
354 * because we want write after unlink usecase
355 * to work.
356 */
357 inode_fid = v9fs_writeback_fid(dentry);
358 if (IS_ERR(inode_fid)) {
359 err = PTR_ERR(inode_fid);
360 mutex_unlock(&v9inode->v_mutex);
361 goto err_clunk_old_fid;
362 }
363 v9inode->writeback_fid = (void *) inode_fid;
364 }
365 mutex_unlock(&v9inode->v_mutex);
366 /* Since we are opening a file, assign the open fid to the file */
367 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
368 if (IS_ERR(filp)) {
369 err = PTR_ERR(filp);
370 goto err_clunk_old_fid;
371 }
372 filp->private_data = ofid;
373#ifdef CONFIG_9P_FSCACHE
374 if (v9ses->cache)
375 v9fs_cache_inode_set_cookie(inode, filp);
376#endif
377 return 0;
378
379error:
380 if (fid)
381 p9_client_clunk(fid);
382err_clunk_old_fid:
383 if (ofid)
384 p9_client_clunk(ofid);
385 v9fs_set_create_acl(NULL, &dacl, &pacl);
386 return err;
387}
388
389/**
390 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
391 * @dir: inode that is being unlinked
392 * @dentry: dentry that is being unlinked
393 * @mode: mode for new directory
394 *
395 */
396
397static int v9fs_vfs_mkdir_dotl(struct inode *dir,
398 struct dentry *dentry, int omode)
399{
400 int err;
401 struct v9fs_session_info *v9ses;
402 struct p9_fid *fid = NULL, *dfid = NULL;
403 gid_t gid;
404 char *name;
405 umode_t mode;
406 struct inode *inode;
407 struct p9_qid qid;
408 struct dentry *dir_dentry;
409 struct posix_acl *dacl = NULL, *pacl = NULL;
410
411 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
412 err = 0;
413 v9ses = v9fs_inode2v9ses(dir);
414
415 omode |= S_IFDIR;
416 if (dir->i_mode & S_ISGID)
417 omode |= S_ISGID;
418
419 dir_dentry = v9fs_dentry_from_dir_inode(dir);
420 dfid = v9fs_fid_lookup(dir_dentry);
421 if (IS_ERR(dfid)) {
422 err = PTR_ERR(dfid);
423 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
424 dfid = NULL;
425 goto error;
426 }
427
428 gid = v9fs_get_fsgid_for_create(dir);
429 mode = omode;
430 /* Update mode based on ACL value */
431 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
432 if (err) {
433 P9_DPRINTK(P9_DEBUG_VFS,
434 "Failed to get acl values in mkdir %d\n", err);
435 goto error;
436 }
437 name = (char *) dentry->d_name.name;
438 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
439 if (err < 0)
440 goto error;
441
442 /* instantiate inode and assign the unopened fid to the dentry */
443 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
444 fid = p9_client_walk(dfid, 1, &name, 1);
445 if (IS_ERR(fid)) {
446 err = PTR_ERR(fid);
447 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
448 err);
449 fid = NULL;
450 goto error;
451 }
452
453 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
454 if (IS_ERR(inode)) {
455 err = PTR_ERR(inode);
456 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
457 err);
458 goto error;
459 }
460 err = v9fs_fid_add(dentry, fid);
461 if (err < 0)
462 goto error;
463 d_instantiate(dentry, inode);
464 fid = NULL;
465 } else {
466 /*
467 * Not in cached mode. No need to populate
468 * inode with stat. We need to get an inode
469 * so that we can set the acl with dentry
470 */
471 inode = v9fs_get_inode(dir->i_sb, mode, 0);
472 if (IS_ERR(inode)) {
473 err = PTR_ERR(inode);
474 goto error;
475 }
476 d_instantiate(dentry, inode);
477 }
478 /* Now set the ACL based on the default value */
479 v9fs_set_create_acl(dentry, &dacl, &pacl);
480 inc_nlink(dir);
481 v9fs_invalidate_inode_attr(dir);
482error:
483 if (fid)
484 p9_client_clunk(fid);
485 v9fs_set_create_acl(NULL, &dacl, &pacl);
486 return err;
487}
488
489static int
490v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
491 struct kstat *stat)
492{
493 int err;
494 struct v9fs_session_info *v9ses;
495 struct p9_fid *fid;
496 struct p9_stat_dotl *st;
497
498 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
499 err = -EPERM;
500 v9ses = v9fs_dentry2v9ses(dentry);
501 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
502 generic_fillattr(dentry->d_inode, stat);
503 return 0;
504 }
505 fid = v9fs_fid_lookup(dentry);
506 if (IS_ERR(fid))
507 return PTR_ERR(fid);
508
509 /* Ask for all the fields in stat structure. Server will return
510 * whatever it supports
511 */
512
513 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
514 if (IS_ERR(st))
515 return PTR_ERR(st);
516
517 v9fs_stat2inode_dotl(st, dentry->d_inode);
518 generic_fillattr(dentry->d_inode, stat);
519 /* Change block size to what the server returned */
520 stat->blksize = st->st_blksize;
521
522 kfree(st);
523 return 0;
524}
525
526/**
527 * v9fs_vfs_setattr_dotl - set file metadata
528 * @dentry: file whose metadata to set
529 * @iattr: metadata assignment structure
530 *
531 */
532
533int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
534{
535 int retval;
536 struct v9fs_session_info *v9ses;
537 struct p9_fid *fid;
538 struct p9_iattr_dotl p9attr;
539
540 P9_DPRINTK(P9_DEBUG_VFS, "\n");
541
542 retval = inode_change_ok(dentry->d_inode, iattr);
543 if (retval)
544 return retval;
545
546 p9attr.valid = iattr->ia_valid;
547 p9attr.mode = iattr->ia_mode;
548 p9attr.uid = iattr->ia_uid;
549 p9attr.gid = iattr->ia_gid;
550 p9attr.size = iattr->ia_size;
551 p9attr.atime_sec = iattr->ia_atime.tv_sec;
552 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
553 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
554 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
555
556 retval = -EPERM;
557 v9ses = v9fs_dentry2v9ses(dentry);
558 fid = v9fs_fid_lookup(dentry);
559 if (IS_ERR(fid))
560 return PTR_ERR(fid);
561
562 /* Write all dirty data */
563 if (S_ISREG(dentry->d_inode->i_mode))
564 filemap_write_and_wait(dentry->d_inode->i_mapping);
565
566 retval = p9_client_setattr(fid, &p9attr);
567 if (retval < 0)
568 return retval;
569
570 if ((iattr->ia_valid & ATTR_SIZE) &&
571 iattr->ia_size != i_size_read(dentry->d_inode))
572 truncate_setsize(dentry->d_inode, iattr->ia_size);
573
574 v9fs_invalidate_inode_attr(dentry->d_inode);
575 setattr_copy(dentry->d_inode, iattr);
576 mark_inode_dirty(dentry->d_inode);
577 if (iattr->ia_valid & ATTR_MODE) {
578 /* We also want to update ACL when we update mode bits */
579 retval = v9fs_acl_chmod(dentry);
580 if (retval < 0)
581 return retval;
582 }
583 return 0;
584}
585
586/**
587 * v9fs_stat2inode_dotl - populate an inode structure with stat info
588 * @stat: stat structure
589 * @inode: inode to populate
590 * @sb: superblock of filesystem
591 *
592 */
593
594void
595v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
596{
597 mode_t mode;
598 struct v9fs_inode *v9inode = V9FS_I(inode);
599
600 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
601 inode->i_atime.tv_sec = stat->st_atime_sec;
602 inode->i_atime.tv_nsec = stat->st_atime_nsec;
603 inode->i_mtime.tv_sec = stat->st_mtime_sec;
604 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
605 inode->i_ctime.tv_sec = stat->st_ctime_sec;
606 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
607 inode->i_uid = stat->st_uid;
608 inode->i_gid = stat->st_gid;
609 inode->i_nlink = stat->st_nlink;
610
611 mode = stat->st_mode & S_IALLUGO;
612 mode |= inode->i_mode & ~S_IALLUGO;
613 inode->i_mode = mode;
614
615 i_size_write(inode, stat->st_size);
616 inode->i_blocks = stat->st_blocks;
617 } else {
618 if (stat->st_result_mask & P9_STATS_ATIME) {
619 inode->i_atime.tv_sec = stat->st_atime_sec;
620 inode->i_atime.tv_nsec = stat->st_atime_nsec;
621 }
622 if (stat->st_result_mask & P9_STATS_MTIME) {
623 inode->i_mtime.tv_sec = stat->st_mtime_sec;
624 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
625 }
626 if (stat->st_result_mask & P9_STATS_CTIME) {
627 inode->i_ctime.tv_sec = stat->st_ctime_sec;
628 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
629 }
630 if (stat->st_result_mask & P9_STATS_UID)
631 inode->i_uid = stat->st_uid;
632 if (stat->st_result_mask & P9_STATS_GID)
633 inode->i_gid = stat->st_gid;
634 if (stat->st_result_mask & P9_STATS_NLINK)
635 inode->i_nlink = stat->st_nlink;
636 if (stat->st_result_mask & P9_STATS_MODE) {
637 inode->i_mode = stat->st_mode;
638 if ((S_ISBLK(inode->i_mode)) ||
639 (S_ISCHR(inode->i_mode)))
640 init_special_inode(inode, inode->i_mode,
641 inode->i_rdev);
642 }
643 if (stat->st_result_mask & P9_STATS_RDEV)
644 inode->i_rdev = new_decode_dev(stat->st_rdev);
645 if (stat->st_result_mask & P9_STATS_SIZE)
646 i_size_write(inode, stat->st_size);
647 if (stat->st_result_mask & P9_STATS_BLOCKS)
648 inode->i_blocks = stat->st_blocks;
649 }
650 if (stat->st_result_mask & P9_STATS_GEN)
651 inode->i_generation = stat->st_gen;
652
653 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
654 * because the inode structure does not have fields for them.
655 */
656 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
657}
658
659static int
660v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
661 const char *symname)
662{
663 int err;
664 gid_t gid;
665 char *name;
666 struct p9_qid qid;
667 struct inode *inode;
668 struct p9_fid *dfid;
669 struct p9_fid *fid = NULL;
670 struct v9fs_session_info *v9ses;
671
672 name = (char *) dentry->d_name.name;
673 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
674 dir->i_ino, name, symname);
675 v9ses = v9fs_inode2v9ses(dir);
676
677 dfid = v9fs_fid_lookup(dentry->d_parent);
678 if (IS_ERR(dfid)) {
679 err = PTR_ERR(dfid);
680 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
681 return err;
682 }
683
684 gid = v9fs_get_fsgid_for_create(dir);
685
686 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
687 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
688
689 if (err < 0) {
690 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
691 goto error;
692 }
693
694 v9fs_invalidate_inode_attr(dir);
695 if (v9ses->cache) {
696 /* Now walk from the parent so we can get an unopened fid. */
697 fid = p9_client_walk(dfid, 1, &name, 1);
698 if (IS_ERR(fid)) {
699 err = PTR_ERR(fid);
700 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
701 err);
702 fid = NULL;
703 goto error;
704 }
705
706 /* instantiate inode and assign the unopened fid to dentry */
707 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
708 if (IS_ERR(inode)) {
709 err = PTR_ERR(inode);
710 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
711 err);
712 goto error;
713 }
714 err = v9fs_fid_add(dentry, fid);
715 if (err < 0)
716 goto error;
717 d_instantiate(dentry, inode);
718 fid = NULL;
719 } else {
720 /* Not in cached mode. No need to populate inode with stat */
721 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
722 if (IS_ERR(inode)) {
723 err = PTR_ERR(inode);
724 goto error;
725 }
726 d_instantiate(dentry, inode);
727 }
728
729error:
730 if (fid)
731 p9_client_clunk(fid);
732
733 return err;
734}
735
736/**
737 * v9fs_vfs_link_dotl - create a hardlink for dotl
738 * @old_dentry: dentry for file to link to
739 * @dir: inode destination for new link
740 * @dentry: dentry for link
741 *
742 */
743
744static int
745v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
746 struct dentry *dentry)
747{
748 int err;
749 char *name;
750 struct dentry *dir_dentry;
751 struct p9_fid *dfid, *oldfid;
752 struct v9fs_session_info *v9ses;
753
754 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
755 dir->i_ino, old_dentry->d_name.name,
756 dentry->d_name.name);
757
758 v9ses = v9fs_inode2v9ses(dir);
759 dir_dentry = v9fs_dentry_from_dir_inode(dir);
760 dfid = v9fs_fid_lookup(dir_dentry);
761 if (IS_ERR(dfid))
762 return PTR_ERR(dfid);
763
764 oldfid = v9fs_fid_lookup(old_dentry);
765 if (IS_ERR(oldfid))
766 return PTR_ERR(oldfid);
767
768 name = (char *) dentry->d_name.name;
769
770 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
771
772 if (err < 0) {
773 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
774 return err;
775 }
776
777 v9fs_invalidate_inode_attr(dir);
778 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
779 /* Get the latest stat info from server. */
780 struct p9_fid *fid;
781 fid = v9fs_fid_lookup(old_dentry);
782 if (IS_ERR(fid))
783 return PTR_ERR(fid);
784
785 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
786 }
787 ihold(old_dentry->d_inode);
788 d_instantiate(dentry, old_dentry->d_inode);
789
790 return err;
791}
792
793/**
794 * v9fs_vfs_mknod_dotl - create a special file
795 * @dir: inode destination for new link
796 * @dentry: dentry for file
797 * @mode: mode for creation
798 * @rdev: device associated with special file
799 *
800 */
801static int
802v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
803 dev_t rdev)
804{
805 int err;
806 gid_t gid;
807 char *name;
808 umode_t mode;
809 struct v9fs_session_info *v9ses;
810 struct p9_fid *fid = NULL, *dfid = NULL;
811 struct inode *inode;
812 struct p9_qid qid;
813 struct dentry *dir_dentry;
814 struct posix_acl *dacl = NULL, *pacl = NULL;
815
816 P9_DPRINTK(P9_DEBUG_VFS,
817 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
818 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
819
820 if (!new_valid_dev(rdev))
821 return -EINVAL;
822
823 v9ses = v9fs_inode2v9ses(dir);
824 dir_dentry = v9fs_dentry_from_dir_inode(dir);
825 dfid = v9fs_fid_lookup(dir_dentry);
826 if (IS_ERR(dfid)) {
827 err = PTR_ERR(dfid);
828 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
829 dfid = NULL;
830 goto error;
831 }
832
833 gid = v9fs_get_fsgid_for_create(dir);
834 mode = omode;
835 /* Update mode based on ACL value */
836 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
837 if (err) {
838 P9_DPRINTK(P9_DEBUG_VFS,
839 "Failed to get acl values in mknod %d\n", err);
840 goto error;
841 }
842 name = (char *) dentry->d_name.name;
843
844 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
845 if (err < 0)
846 goto error;
847
848 v9fs_invalidate_inode_attr(dir);
849 /* instantiate inode and assign the unopened fid to the dentry */
850 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
851 fid = p9_client_walk(dfid, 1, &name, 1);
852 if (IS_ERR(fid)) {
853 err = PTR_ERR(fid);
854 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
855 err);
856 fid = NULL;
857 goto error;
858 }
859
860 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
861 if (IS_ERR(inode)) {
862 err = PTR_ERR(inode);
863 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
864 err);
865 goto error;
866 }
867 err = v9fs_fid_add(dentry, fid);
868 if (err < 0)
869 goto error;
870 d_instantiate(dentry, inode);
871 fid = NULL;
872 } else {
873 /*
874 * Not in cached mode. No need to populate inode with stat.
875 * socket syscall returns a fd, so we need instantiate
876 */
877 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
878 if (IS_ERR(inode)) {
879 err = PTR_ERR(inode);
880 goto error;
881 }
882 d_instantiate(dentry, inode);
883 }
884 /* Now set the ACL based on the default value */
885 v9fs_set_create_acl(dentry, &dacl, &pacl);
886error:
887 if (fid)
888 p9_client_clunk(fid);
889 v9fs_set_create_acl(NULL, &dacl, &pacl);
890 return err;
891}
892
893/**
894 * v9fs_vfs_follow_link_dotl - follow a symlink path
895 * @dentry: dentry for symlink
896 * @nd: nameidata
897 *
898 */
899
900static void *
901v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
902{
903 int retval;
904 struct p9_fid *fid;
905 char *link = __getname();
906 char *target;
907
908 P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
909
910 if (!link) {
911 link = ERR_PTR(-ENOMEM);
912 goto ndset;
913 }
914 fid = v9fs_fid_lookup(dentry);
915 if (IS_ERR(fid)) {
916 __putname(link);
917 link = ERR_CAST(fid);
918 goto ndset;
919 }
920 retval = p9_client_readlink(fid, &target);
921 if (!retval) {
922 strcpy(link, target);
923 kfree(target);
924 goto ndset;
925 }
926 __putname(link);
927 link = ERR_PTR(retval);
928ndset:
929 nd_set_link(nd, link);
930 return NULL;
931}
932
933int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
934{
935 loff_t i_size;
936 struct p9_stat_dotl *st;
937 struct v9fs_session_info *v9ses;
938
939 v9ses = v9fs_inode2v9ses(inode);
940 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
941 if (IS_ERR(st))
942 return PTR_ERR(st);
943 /*
944 * Don't update inode if the file type is different
945 */
946 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
947 goto out;
948
949 spin_lock(&inode->i_lock);
950 /*
951 * We don't want to refresh inode->i_size,
952 * because we may have cached data
953 */
954 i_size = inode->i_size;
955 v9fs_stat2inode_dotl(st, inode);
956 if (v9ses->cache)
957 inode->i_size = i_size;
958 spin_unlock(&inode->i_lock);
959out:
960 kfree(st);
961 return 0;
962}
963
964const struct inode_operations v9fs_dir_inode_operations_dotl = {
965 .create = v9fs_vfs_create_dotl,
966 .lookup = v9fs_vfs_lookup,
967 .link = v9fs_vfs_link_dotl,
968 .symlink = v9fs_vfs_symlink_dotl,
969 .unlink = v9fs_vfs_unlink,
970 .mkdir = v9fs_vfs_mkdir_dotl,
971 .rmdir = v9fs_vfs_rmdir,
972 .mknod = v9fs_vfs_mknod_dotl,
973 .rename = v9fs_vfs_rename,
974 .getattr = v9fs_vfs_getattr_dotl,
975 .setattr = v9fs_vfs_setattr_dotl,
976 .setxattr = generic_setxattr,
977 .getxattr = generic_getxattr,
978 .removexattr = generic_removexattr,
979 .listxattr = v9fs_listxattr,
980 .get_acl = v9fs_iop_get_acl,
981};
982
983const struct inode_operations v9fs_file_inode_operations_dotl = {
984 .getattr = v9fs_vfs_getattr_dotl,
985 .setattr = v9fs_vfs_setattr_dotl,
986 .setxattr = generic_setxattr,
987 .getxattr = generic_getxattr,
988 .removexattr = generic_removexattr,
989 .listxattr = v9fs_listxattr,
990 .get_acl = v9fs_iop_get_acl,
991};
992
993const struct inode_operations v9fs_symlink_inode_operations_dotl = {
994 .readlink = generic_readlink,
995 .follow_link = v9fs_vfs_follow_link_dotl,
996 .put_link = v9fs_vfs_put_link,
997 .getattr = v9fs_vfs_getattr_dotl,
998 .setattr = v9fs_vfs_setattr_dotl,
999 .setxattr = generic_setxattr,
1000 .getxattr = generic_getxattr,
1001 .removexattr = generic_removexattr,
1002 .listxattr = v9fs_listxattr,
1003};
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/9p/vfs_inode_dotl.c
4 *
5 * This file contains vfs inode ops for the 9P2000.L protocol.
6 *
7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
9 */
10
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/fs.h>
14#include <linux/file.h>
15#include <linux/pagemap.h>
16#include <linux/stat.h>
17#include <linux/string.h>
18#include <linux/inet.h>
19#include <linux/namei.h>
20#include <linux/idr.h>
21#include <linux/sched.h>
22#include <linux/slab.h>
23#include <linux/xattr.h>
24#include <linux/posix_acl.h>
25#include <net/9p/9p.h>
26#include <net/9p/client.h>
27
28#include "v9fs.h"
29#include "v9fs_vfs.h"
30#include "fid.h"
31#include "cache.h"
32#include "xattr.h"
33#include "acl.h"
34
35static int
36v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
37 dev_t rdev);
38
39/**
40 * v9fs_get_fsgid_for_create - 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->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
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 *, void *);
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 * @dir: directory inode that is being created
215 * @dentry: dentry that is being deleted
216 * @omode: create permissions
217 *
218 */
219
220static int
221v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
222 bool excl)
223{
224 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
225}
226
227static int
228v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
229 struct file *file, unsigned flags, umode_t omode)
230{
231 int err = 0;
232 kgid_t gid;
233 umode_t mode;
234 const unsigned char *name = NULL;
235 struct p9_qid qid;
236 struct inode *inode;
237 struct p9_fid *fid = NULL;
238 struct v9fs_inode *v9inode;
239 struct p9_fid *dfid, *ofid, *inode_fid;
240 struct v9fs_session_info *v9ses;
241 struct posix_acl *pacl = NULL, *dacl = NULL;
242 struct dentry *res = NULL;
243
244 if (d_in_lookup(dentry)) {
245 res = v9fs_vfs_lookup(dir, dentry, 0);
246 if (IS_ERR(res))
247 return PTR_ERR(res);
248
249 if (res)
250 dentry = res;
251 }
252
253 /* Only creates */
254 if (!(flags & O_CREAT) || d_really_is_positive(dentry))
255 return finish_no_open(file, res);
256
257 v9ses = v9fs_inode2v9ses(dir);
258
259 name = dentry->d_name.name;
260 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
261 name, flags, omode);
262
263 dfid = v9fs_parent_fid(dentry);
264 if (IS_ERR(dfid)) {
265 err = PTR_ERR(dfid);
266 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
267 goto out;
268 }
269
270 /* clone a fid to use for creation */
271 ofid = clone_fid(dfid);
272 if (IS_ERR(ofid)) {
273 err = PTR_ERR(ofid);
274 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
275 goto out;
276 }
277
278 gid = v9fs_get_fsgid_for_create(dir);
279
280 mode = omode;
281 /* Update mode based on ACL value */
282 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
283 if (err) {
284 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
285 err);
286 goto error;
287 }
288 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
289 mode, gid, &qid);
290 if (err < 0) {
291 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
292 err);
293 goto error;
294 }
295 v9fs_invalidate_inode_attr(dir);
296
297 /* instantiate inode and assign the unopened fid to the dentry */
298 fid = p9_client_walk(dfid, 1, &name, 1);
299 if (IS_ERR(fid)) {
300 err = PTR_ERR(fid);
301 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
302 fid = NULL;
303 goto error;
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 error;
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 err_clunk_old_fid;
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 err_clunk_old_fid;
342 file->private_data = ofid;
343 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
344 v9fs_cache_inode_set_cookie(inode, file);
345 file->f_mode |= FMODE_CREATED;
346out:
347 v9fs_put_acl(dacl, pacl);
348 dput(res);
349 return err;
350
351error:
352 if (fid)
353 p9_client_clunk(fid);
354err_clunk_old_fid:
355 if (ofid)
356 p9_client_clunk(ofid);
357 goto out;
358}
359
360/**
361 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
362 * @dir: inode that is being unlinked
363 * @dentry: dentry that is being unlinked
364 * @omode: mode for new directory
365 *
366 */
367
368static int v9fs_vfs_mkdir_dotl(struct inode *dir,
369 struct dentry *dentry, umode_t omode)
370{
371 int err;
372 struct v9fs_session_info *v9ses;
373 struct p9_fid *fid = NULL, *dfid = NULL;
374 kgid_t gid;
375 const unsigned char *name;
376 umode_t mode;
377 struct inode *inode;
378 struct p9_qid qid;
379 struct posix_acl *dacl = NULL, *pacl = NULL;
380
381 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
382 err = 0;
383 v9ses = v9fs_inode2v9ses(dir);
384
385 omode |= S_IFDIR;
386 if (dir->i_mode & S_ISGID)
387 omode |= S_ISGID;
388
389 dfid = v9fs_parent_fid(dentry);
390 if (IS_ERR(dfid)) {
391 err = PTR_ERR(dfid);
392 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
393 dfid = NULL;
394 goto error;
395 }
396
397 gid = v9fs_get_fsgid_for_create(dir);
398 mode = omode;
399 /* Update mode based on ACL value */
400 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
401 if (err) {
402 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
403 err);
404 goto error;
405 }
406 name = dentry->d_name.name;
407 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
408 if (err < 0)
409 goto error;
410
411 fid = p9_client_walk(dfid, 1, &name, 1);
412 if (IS_ERR(fid)) {
413 err = PTR_ERR(fid);
414 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
415 err);
416 fid = NULL;
417 goto error;
418 }
419
420 /* instantiate inode and assign the unopened fid to the dentry */
421 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
422 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
423 if (IS_ERR(inode)) {
424 err = PTR_ERR(inode);
425 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
426 err);
427 goto error;
428 }
429 v9fs_fid_add(dentry, fid);
430 v9fs_set_create_acl(inode, fid, dacl, pacl);
431 d_instantiate(dentry, inode);
432 fid = NULL;
433 err = 0;
434 } else {
435 /*
436 * Not in cached mode. No need to populate
437 * inode with stat. We need to get an inode
438 * so that we can set the acl with dentry
439 */
440 inode = v9fs_get_inode(dir->i_sb, mode, 0);
441 if (IS_ERR(inode)) {
442 err = PTR_ERR(inode);
443 goto error;
444 }
445 v9fs_set_create_acl(inode, fid, dacl, pacl);
446 d_instantiate(dentry, inode);
447 }
448 inc_nlink(dir);
449 v9fs_invalidate_inode_attr(dir);
450error:
451 if (fid)
452 p9_client_clunk(fid);
453 v9fs_put_acl(dacl, pacl);
454 return err;
455}
456
457static int
458v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
459 u32 request_mask, unsigned int flags)
460{
461 struct dentry *dentry = path->dentry;
462 struct v9fs_session_info *v9ses;
463 struct p9_fid *fid;
464 struct p9_stat_dotl *st;
465
466 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
467 v9ses = v9fs_dentry2v9ses(dentry);
468 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
469 generic_fillattr(d_inode(dentry), stat);
470 return 0;
471 }
472 fid = v9fs_fid_lookup(dentry);
473 if (IS_ERR(fid))
474 return PTR_ERR(fid);
475
476 /* Ask for all the fields in stat structure. Server will return
477 * whatever it supports
478 */
479
480 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
481 if (IS_ERR(st))
482 return PTR_ERR(st);
483
484 v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
485 generic_fillattr(d_inode(dentry), stat);
486 /* Change block size to what the server returned */
487 stat->blksize = st->st_blksize;
488
489 kfree(st);
490 return 0;
491}
492
493/*
494 * Attribute flags.
495 */
496#define P9_ATTR_MODE (1 << 0)
497#define P9_ATTR_UID (1 << 1)
498#define P9_ATTR_GID (1 << 2)
499#define P9_ATTR_SIZE (1 << 3)
500#define P9_ATTR_ATIME (1 << 4)
501#define P9_ATTR_MTIME (1 << 5)
502#define P9_ATTR_CTIME (1 << 6)
503#define P9_ATTR_ATIME_SET (1 << 7)
504#define P9_ATTR_MTIME_SET (1 << 8)
505
506struct dotl_iattr_map {
507 int iattr_valid;
508 int p9_iattr_valid;
509};
510
511static int v9fs_mapped_iattr_valid(int iattr_valid)
512{
513 int i;
514 int p9_iattr_valid = 0;
515 struct dotl_iattr_map dotl_iattr_map[] = {
516 { ATTR_MODE, P9_ATTR_MODE },
517 { ATTR_UID, P9_ATTR_UID },
518 { ATTR_GID, P9_ATTR_GID },
519 { ATTR_SIZE, P9_ATTR_SIZE },
520 { ATTR_ATIME, P9_ATTR_ATIME },
521 { ATTR_MTIME, P9_ATTR_MTIME },
522 { ATTR_CTIME, P9_ATTR_CTIME },
523 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET },
524 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET },
525 };
526 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
527 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
528 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
529 }
530 return p9_iattr_valid;
531}
532
533/**
534 * v9fs_vfs_setattr_dotl - set file metadata
535 * @dentry: file whose metadata to set
536 * @iattr: metadata assignment structure
537 *
538 */
539
540int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
541{
542 int retval;
543 struct p9_fid *fid = NULL;
544 struct p9_iattr_dotl p9attr;
545 struct inode *inode = d_inode(dentry);
546
547 p9_debug(P9_DEBUG_VFS, "\n");
548
549 retval = setattr_prepare(dentry, iattr);
550 if (retval)
551 return retval;
552
553 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
554 p9attr.mode = iattr->ia_mode;
555 p9attr.uid = iattr->ia_uid;
556 p9attr.gid = iattr->ia_gid;
557 p9attr.size = iattr->ia_size;
558 p9attr.atime_sec = iattr->ia_atime.tv_sec;
559 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
560 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
561 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
562
563 if (iattr->ia_valid & ATTR_FILE) {
564 fid = iattr->ia_file->private_data;
565 WARN_ON(!fid);
566 }
567 if (!fid)
568 fid = v9fs_fid_lookup(dentry);
569 if (IS_ERR(fid))
570 return PTR_ERR(fid);
571
572 /* Write all dirty data */
573 if (S_ISREG(inode->i_mode))
574 filemap_write_and_wait(inode->i_mapping);
575
576 retval = p9_client_setattr(fid, &p9attr);
577 if (retval < 0)
578 return retval;
579
580 if ((iattr->ia_valid & ATTR_SIZE) &&
581 iattr->ia_size != i_size_read(inode))
582 truncate_setsize(inode, iattr->ia_size);
583
584 v9fs_invalidate_inode_attr(inode);
585 setattr_copy(inode, iattr);
586 mark_inode_dirty(inode);
587 if (iattr->ia_valid & ATTR_MODE) {
588 /* We also want to update ACL when we update mode bits */
589 retval = v9fs_acl_chmod(inode, fid);
590 if (retval < 0)
591 return retval;
592 }
593 return 0;
594}
595
596/**
597 * v9fs_stat2inode_dotl - populate an inode structure with stat info
598 * @stat: stat structure
599 * @inode: inode to populate
600 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
601 *
602 */
603
604void
605v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
606 unsigned int flags)
607{
608 umode_t mode;
609 struct v9fs_inode *v9inode = V9FS_I(inode);
610
611 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
612 inode->i_atime.tv_sec = stat->st_atime_sec;
613 inode->i_atime.tv_nsec = stat->st_atime_nsec;
614 inode->i_mtime.tv_sec = stat->st_mtime_sec;
615 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
616 inode->i_ctime.tv_sec = stat->st_ctime_sec;
617 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
618 inode->i_uid = stat->st_uid;
619 inode->i_gid = stat->st_gid;
620 set_nlink(inode, stat->st_nlink);
621
622 mode = stat->st_mode & S_IALLUGO;
623 mode |= inode->i_mode & ~S_IALLUGO;
624 inode->i_mode = mode;
625
626 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
627 v9fs_i_size_write(inode, stat->st_size);
628 inode->i_blocks = stat->st_blocks;
629 } else {
630 if (stat->st_result_mask & P9_STATS_ATIME) {
631 inode->i_atime.tv_sec = stat->st_atime_sec;
632 inode->i_atime.tv_nsec = stat->st_atime_nsec;
633 }
634 if (stat->st_result_mask & P9_STATS_MTIME) {
635 inode->i_mtime.tv_sec = stat->st_mtime_sec;
636 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
637 }
638 if (stat->st_result_mask & P9_STATS_CTIME) {
639 inode->i_ctime.tv_sec = stat->st_ctime_sec;
640 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
641 }
642 if (stat->st_result_mask & P9_STATS_UID)
643 inode->i_uid = stat->st_uid;
644 if (stat->st_result_mask & P9_STATS_GID)
645 inode->i_gid = stat->st_gid;
646 if (stat->st_result_mask & P9_STATS_NLINK)
647 set_nlink(inode, stat->st_nlink);
648 if (stat->st_result_mask & P9_STATS_MODE) {
649 inode->i_mode = stat->st_mode;
650 if ((S_ISBLK(inode->i_mode)) ||
651 (S_ISCHR(inode->i_mode)))
652 init_special_inode(inode, inode->i_mode,
653 inode->i_rdev);
654 }
655 if (stat->st_result_mask & P9_STATS_RDEV)
656 inode->i_rdev = new_decode_dev(stat->st_rdev);
657 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
658 stat->st_result_mask & P9_STATS_SIZE)
659 v9fs_i_size_write(inode, stat->st_size);
660 if (stat->st_result_mask & P9_STATS_BLOCKS)
661 inode->i_blocks = stat->st_blocks;
662 }
663 if (stat->st_result_mask & P9_STATS_GEN)
664 inode->i_generation = stat->st_gen;
665
666 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
667 * because the inode structure does not have fields for them.
668 */
669 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
670}
671
672static int
673v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
674 const char *symname)
675{
676 int err;
677 kgid_t gid;
678 const unsigned char *name;
679 struct p9_qid qid;
680 struct inode *inode;
681 struct p9_fid *dfid;
682 struct p9_fid *fid = NULL;
683 struct v9fs_session_info *v9ses;
684
685 name = dentry->d_name.name;
686 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
687 v9ses = v9fs_inode2v9ses(dir);
688
689 dfid = v9fs_parent_fid(dentry);
690 if (IS_ERR(dfid)) {
691 err = PTR_ERR(dfid);
692 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
693 return err;
694 }
695
696 gid = v9fs_get_fsgid_for_create(dir);
697
698 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
699 err = p9_client_symlink(dfid, name, symname, gid, &qid);
700
701 if (err < 0) {
702 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
703 goto error;
704 }
705
706 v9fs_invalidate_inode_attr(dir);
707 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
708 /* Now walk from the parent so we can get an unopened fid. */
709 fid = p9_client_walk(dfid, 1, &name, 1);
710 if (IS_ERR(fid)) {
711 err = PTR_ERR(fid);
712 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
713 err);
714 fid = NULL;
715 goto error;
716 }
717
718 /* instantiate inode and assign the unopened fid to dentry */
719 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
720 if (IS_ERR(inode)) {
721 err = PTR_ERR(inode);
722 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
723 err);
724 goto error;
725 }
726 v9fs_fid_add(dentry, fid);
727 d_instantiate(dentry, inode);
728 fid = NULL;
729 err = 0;
730 } else {
731 /* Not in cached mode. No need to populate inode with stat */
732 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
733 if (IS_ERR(inode)) {
734 err = PTR_ERR(inode);
735 goto error;
736 }
737 d_instantiate(dentry, inode);
738 }
739
740error:
741 if (fid)
742 p9_client_clunk(fid);
743
744 return err;
745}
746
747/**
748 * v9fs_vfs_link_dotl - create a hardlink for dotl
749 * @old_dentry: dentry for file to link to
750 * @dir: inode destination for new link
751 * @dentry: dentry for link
752 *
753 */
754
755static int
756v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
757 struct dentry *dentry)
758{
759 int err;
760 struct p9_fid *dfid, *oldfid;
761 struct v9fs_session_info *v9ses;
762
763 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
764 dir->i_ino, old_dentry, dentry);
765
766 v9ses = v9fs_inode2v9ses(dir);
767 dfid = v9fs_parent_fid(dentry);
768 if (IS_ERR(dfid))
769 return PTR_ERR(dfid);
770
771 oldfid = v9fs_fid_lookup(old_dentry);
772 if (IS_ERR(oldfid))
773 return PTR_ERR(oldfid);
774
775 err = p9_client_link(dfid, oldfid, dentry->d_name.name);
776
777 if (err < 0) {
778 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
779 return err;
780 }
781
782 v9fs_invalidate_inode_attr(dir);
783 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
784 /* Get the latest stat info from server. */
785 struct p9_fid *fid;
786 fid = v9fs_fid_lookup(old_dentry);
787 if (IS_ERR(fid))
788 return PTR_ERR(fid);
789
790 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry));
791 }
792 ihold(d_inode(old_dentry));
793 d_instantiate(dentry, d_inode(old_dentry));
794
795 return err;
796}
797
798/**
799 * v9fs_vfs_mknod_dotl - create a special file
800 * @dir: inode destination for new link
801 * @dentry: dentry for file
802 * @omode: mode for creation
803 * @rdev: device associated with special file
804 *
805 */
806static int
807v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
808 dev_t rdev)
809{
810 int err;
811 kgid_t gid;
812 const unsigned char *name;
813 umode_t mode;
814 struct v9fs_session_info *v9ses;
815 struct p9_fid *fid = NULL, *dfid = NULL;
816 struct inode *inode;
817 struct p9_qid qid;
818 struct posix_acl *dacl = NULL, *pacl = NULL;
819
820 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
821 dir->i_ino, dentry, omode,
822 MAJOR(rdev), MINOR(rdev));
823
824 v9ses = v9fs_inode2v9ses(dir);
825 dfid = v9fs_parent_fid(dentry);
826 if (IS_ERR(dfid)) {
827 err = PTR_ERR(dfid);
828 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
829 dfid = NULL;
830 goto error;
831 }
832
833 gid = v9fs_get_fsgid_for_create(dir);
834 mode = omode;
835 /* Update mode based on ACL value */
836 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
837 if (err) {
838 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
839 err);
840 goto error;
841 }
842 name = dentry->d_name.name;
843
844 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
845 if (err < 0)
846 goto error;
847
848 v9fs_invalidate_inode_attr(dir);
849 fid = p9_client_walk(dfid, 1, &name, 1);
850 if (IS_ERR(fid)) {
851 err = PTR_ERR(fid);
852 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
853 err);
854 fid = NULL;
855 goto error;
856 }
857
858 /* instantiate inode and assign the unopened fid to the dentry */
859 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
860 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
861 if (IS_ERR(inode)) {
862 err = PTR_ERR(inode);
863 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
864 err);
865 goto error;
866 }
867 v9fs_set_create_acl(inode, fid, dacl, pacl);
868 v9fs_fid_add(dentry, fid);
869 d_instantiate(dentry, inode);
870 fid = NULL;
871 err = 0;
872 } else {
873 /*
874 * Not in cached mode. No need to populate inode with stat.
875 * socket syscall returns a fd, so we need instantiate
876 */
877 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
878 if (IS_ERR(inode)) {
879 err = PTR_ERR(inode);
880 goto error;
881 }
882 v9fs_set_create_acl(inode, fid, dacl, pacl);
883 d_instantiate(dentry, inode);
884 }
885error:
886 if (fid)
887 p9_client_clunk(fid);
888 v9fs_put_acl(dacl, pacl);
889 return err;
890}
891
892/**
893 * v9fs_vfs_get_link_dotl - follow a symlink path
894 * @dentry: dentry for symlink
895 * @inode: inode for symlink
896 * @done: destructor for return value
897 */
898
899static const char *
900v9fs_vfs_get_link_dotl(struct dentry *dentry,
901 struct inode *inode,
902 struct delayed_call *done)
903{
904 struct p9_fid *fid;
905 char *target;
906 int retval;
907
908 if (!dentry)
909 return ERR_PTR(-ECHILD);
910
911 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
912
913 fid = v9fs_fid_lookup(dentry);
914 if (IS_ERR(fid))
915 return ERR_CAST(fid);
916 retval = p9_client_readlink(fid, &target);
917 if (retval)
918 return ERR_PTR(retval);
919 set_delayed_call(done, kfree_link, target);
920 return target;
921}
922
923int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
924{
925 struct p9_stat_dotl *st;
926 struct v9fs_session_info *v9ses;
927 unsigned int flags;
928
929 v9ses = v9fs_inode2v9ses(inode);
930 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
931 if (IS_ERR(st))
932 return PTR_ERR(st);
933 /*
934 * Don't update inode if the file type is different
935 */
936 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
937 goto out;
938
939 /*
940 * We don't want to refresh inode->i_size,
941 * because we may have cached data
942 */
943 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
944 V9FS_STAT2INODE_KEEP_ISIZE : 0;
945 v9fs_stat2inode_dotl(st, inode, flags);
946out:
947 kfree(st);
948 return 0;
949}
950
951const struct inode_operations v9fs_dir_inode_operations_dotl = {
952 .create = v9fs_vfs_create_dotl,
953 .atomic_open = v9fs_vfs_atomic_open_dotl,
954 .lookup = v9fs_vfs_lookup,
955 .link = v9fs_vfs_link_dotl,
956 .symlink = v9fs_vfs_symlink_dotl,
957 .unlink = v9fs_vfs_unlink,
958 .mkdir = v9fs_vfs_mkdir_dotl,
959 .rmdir = v9fs_vfs_rmdir,
960 .mknod = v9fs_vfs_mknod_dotl,
961 .rename = v9fs_vfs_rename,
962 .getattr = v9fs_vfs_getattr_dotl,
963 .setattr = v9fs_vfs_setattr_dotl,
964 .listxattr = v9fs_listxattr,
965 .get_acl = v9fs_iop_get_acl,
966};
967
968const struct inode_operations v9fs_file_inode_operations_dotl = {
969 .getattr = v9fs_vfs_getattr_dotl,
970 .setattr = v9fs_vfs_setattr_dotl,
971 .listxattr = v9fs_listxattr,
972 .get_acl = v9fs_iop_get_acl,
973};
974
975const struct inode_operations v9fs_symlink_inode_operations_dotl = {
976 .get_link = v9fs_vfs_get_link_dotl,
977 .getattr = v9fs_vfs_getattr_dotl,
978 .setattr = v9fs_vfs_setattr_dotl,
979 .listxattr = v9fs_listxattr,
980};