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-rw-r--r--fs/9p/vfs_inode.c1338
1 files changed, 1338 insertions, 0 deletions
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
new file mode 100644
index 000000000000..0c13fc600049
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+++ b/fs/9p/vfs_inode.c
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1/*
2 * linux/fs/9p/vfs_inode.c
3 *
4 * This file contains vfs inode ops for the 9P2000 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 as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to:
21 * Free Software Foundation
22 * 51 Franklin Street, Fifth Floor
23 * Boston, MA 02111-1301 USA
24 *
25 */
26
27#include <linux/module.h>
28#include <linux/errno.h>
29#include <linux/fs.h>
30#include <linux/file.h>
31#include <linux/pagemap.h>
32#include <linux/stat.h>
33#include <linux/string.h>
34#include <linux/smp_lock.h>
35#include <linux/inet.h>
36#include <linux/namei.h>
37#include <linux/idr.h>
38
39#include "debug.h"
40#include "v9fs.h"
41#include "9p.h"
42#include "v9fs_vfs.h"
43#include "conv.h"
44#include "fid.h"
45
46static struct inode_operations v9fs_dir_inode_operations;
47static struct inode_operations v9fs_dir_inode_operations_ext;
48static struct inode_operations v9fs_file_inode_operations;
49static struct inode_operations v9fs_symlink_inode_operations;
50
51/**
52 * unixmode2p9mode - convert unix mode bits to plan 9
53 * @v9ses: v9fs session information
54 * @mode: mode to convert
55 *
56 */
57
58static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
59{
60 int res;
61 res = mode & 0777;
62 if (S_ISDIR(mode))
63 res |= V9FS_DMDIR;
64 if (v9ses->extended) {
65 if (S_ISLNK(mode))
66 res |= V9FS_DMSYMLINK;
67 if (v9ses->nodev == 0) {
68 if (S_ISSOCK(mode))
69 res |= V9FS_DMSOCKET;
70 if (S_ISFIFO(mode))
71 res |= V9FS_DMNAMEDPIPE;
72 if (S_ISBLK(mode))
73 res |= V9FS_DMDEVICE;
74 if (S_ISCHR(mode))
75 res |= V9FS_DMDEVICE;
76 }
77
78 if ((mode & S_ISUID) == S_ISUID)
79 res |= V9FS_DMSETUID;
80 if ((mode & S_ISGID) == S_ISGID)
81 res |= V9FS_DMSETGID;
82 if ((mode & V9FS_DMLINK))
83 res |= V9FS_DMLINK;
84 }
85
86 return res;
87}
88
89/**
90 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
91 * @v9ses: v9fs session information
92 * @mode: mode to convert
93 *
94 */
95
96static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
97{
98 int res;
99
100 res = mode & 0777;
101
102 if ((mode & V9FS_DMDIR) == V9FS_DMDIR)
103 res |= S_IFDIR;
104 else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
105 res |= S_IFLNK;
106 else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
107 && (v9ses->nodev == 0))
108 res |= S_IFSOCK;
109 else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
110 && (v9ses->nodev == 0))
111 res |= S_IFIFO;
112 else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
113 && (v9ses->nodev == 0))
114 res |= S_IFBLK;
115 else
116 res |= S_IFREG;
117
118 if (v9ses->extended) {
119 if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
120 res |= S_ISUID;
121
122 if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
123 res |= S_ISGID;
124 }
125
126 return res;
127}
128
129/**
130 * v9fs_blank_mistat - helper function to setup a 9P stat structure
131 * @v9ses: 9P session info (for determining extended mode)
132 * @mistat: structure to initialize
133 *
134 */
135
136static void
137v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat)
138{
139 mistat->type = ~0;
140 mistat->dev = ~0;
141 mistat->qid.type = ~0;
142 mistat->qid.version = ~0;
143 *((long long *)&mistat->qid.path) = ~0;
144 mistat->mode = ~0;
145 mistat->atime = ~0;
146 mistat->mtime = ~0;
147 mistat->length = ~0;
148 mistat->name = mistat->data;
149 mistat->uid = mistat->data;
150 mistat->gid = mistat->data;
151 mistat->muid = mistat->data;
152 if (v9ses->extended) {
153 mistat->n_uid = ~0;
154 mistat->n_gid = ~0;
155 mistat->n_muid = ~0;
156 mistat->extension = mistat->data;
157 }
158 *mistat->data = 0;
159}
160
161/**
162 * v9fs_mistat2unix - convert mistat to unix stat
163 * @mistat: Plan 9 metadata (mistat) structure
164 * @buf: unix metadata (stat) structure to populate
165 * @sb: superblock
166 *
167 */
168
169static void
170v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf,
171 struct super_block *sb)
172{
173 struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL;
174
175 buf->st_nlink = 1;
176
177 buf->st_atime = mistat->atime;
178 buf->st_mtime = mistat->mtime;
179 buf->st_ctime = mistat->mtime;
180
181 buf->st_uid = (unsigned short)-1;
182 buf->st_gid = (unsigned short)-1;
183
184 if (v9ses && v9ses->extended) {
185 /* TODO: string to uid mapping via user-space daemon */
186 if (mistat->n_uid != -1)
187 sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid);
188
189 if (mistat->n_gid != -1)
190 sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid);
191 }
192
193 if (buf->st_uid == (unsigned short)-1)
194 buf->st_uid = v9ses->uid;
195 if (buf->st_gid == (unsigned short)-1)
196 buf->st_gid = v9ses->gid;
197
198 buf->st_mode = p9mode2unixmode(v9ses, mistat->mode);
199 if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) {
200 char type = 0;
201 int major = -1;
202 int minor = -1;
203 sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
204 switch (type) {
205 case 'c':
206 buf->st_mode &= ~S_IFBLK;
207 buf->st_mode |= S_IFCHR;
208 break;
209 case 'b':
210 break;
211 default:
212 dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
213 type, mistat->extension);
214 };
215 buf->st_rdev = MKDEV(major, minor);
216 } else
217 buf->st_rdev = 0;
218
219 buf->st_size = mistat->length;
220
221 buf->st_blksize = sb->s_blocksize;
222 buf->st_blocks =
223 (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits;
224}
225
226/**
227 * v9fs_get_inode - helper function to setup an inode
228 * @sb: superblock
229 * @mode: mode to setup inode with
230 *
231 */
232
233struct inode *v9fs_get_inode(struct super_block *sb, int mode)
234{
235 struct inode *inode = NULL;
236 struct v9fs_session_info *v9ses = sb->s_fs_info;
237
238 dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
239
240 inode = new_inode(sb);
241 if (inode) {
242 inode->i_mode = mode;
243 inode->i_uid = current->fsuid;
244 inode->i_gid = current->fsgid;
245 inode->i_blksize = sb->s_blocksize;
246 inode->i_blocks = 0;
247 inode->i_rdev = 0;
248 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
249
250 switch (mode & S_IFMT) {
251 case S_IFIFO:
252 case S_IFBLK:
253 case S_IFCHR:
254 case S_IFSOCK:
255 if(!v9ses->extended) {
256 dprintk(DEBUG_ERROR, "special files without extended mode\n");
257 return ERR_PTR(-EINVAL);
258 }
259 init_special_inode(inode, inode->i_mode,
260 inode->i_rdev);
261 break;
262 case S_IFREG:
263 inode->i_op = &v9fs_file_inode_operations;
264 inode->i_fop = &v9fs_file_operations;
265 break;
266 case S_IFLNK:
267 if(!v9ses->extended) {
268 dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n");
269 return ERR_PTR(-EINVAL);
270 }
271 inode->i_op = &v9fs_symlink_inode_operations;
272 break;
273 case S_IFDIR:
274 inode->i_nlink++;
275 if(v9ses->extended)
276 inode->i_op = &v9fs_dir_inode_operations_ext;
277 else
278 inode->i_op = &v9fs_dir_inode_operations;
279 inode->i_fop = &v9fs_dir_operations;
280 break;
281 default:
282 dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
283 mode, mode & S_IFMT);
284 return ERR_PTR(-EINVAL);
285 }
286 } else {
287 eprintk(KERN_WARNING, "Problem allocating inode\n");
288 return ERR_PTR(-ENOMEM);
289 }
290 return inode;
291}
292
293/**
294 * v9fs_create - helper function to create files and directories
295 * @dir: directory inode file is being created in
296 * @file_dentry: dentry file is being created in
297 * @perm: permissions file is being created with
298 * @open_mode: resulting open mode for file
299 *
300 */
301
302static int
303v9fs_create(struct inode *dir,
304 struct dentry *file_dentry,
305 unsigned int perm, unsigned int open_mode)
306{
307 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
308 struct super_block *sb = dir->i_sb;
309 struct v9fs_fid *dirfid =
310 v9fs_fid_lookup(file_dentry->d_parent, FID_WALK);
311 struct v9fs_fid *fid = NULL;
312 struct inode *file_inode = NULL;
313 struct v9fs_fcall *fcall = NULL;
314 struct v9fs_qid qid;
315 struct stat newstat;
316 int dirfidnum = -1;
317 long newfid = -1;
318 int result = 0;
319 unsigned int iounit = 0;
320
321 perm = unixmode2p9mode(v9ses, perm);
322
323 dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir,
324 file_dentry, perm, open_mode);
325
326 if (!dirfid)
327 return -EBADF;
328
329 dirfidnum = dirfid->fid;
330 if (dirfidnum < 0) {
331 dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n",
332 dir->i_ino);
333 return -EBADF;
334 }
335
336 if (file_dentry->d_inode) {
337 dprintk(DEBUG_ERROR,
338 "Odd. There is an inode for dir %lu, name :%s:\n",
339 dir->i_ino, file_dentry->d_name.name);
340 return -EEXIST;
341 }
342
343 newfid = v9fs_get_idpool(&v9ses->fidpool);
344 if (newfid < 0) {
345 eprintk(KERN_WARNING, "no free fids available\n");
346 return -ENOSPC;
347 }
348
349 result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall);
350 if (result < 0) {
351 dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
352 v9fs_put_idpool(newfid, &v9ses->fidpool);
353 newfid = 0;
354 goto CleanUpFid;
355 }
356
357 kfree(fcall);
358
359 result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name,
360 perm, open_mode, &fcall);
361 if (result < 0) {
362 dprintk(DEBUG_ERROR, "create fails: %s(%d)\n",
363 FCALL_ERROR(fcall), result);
364
365 goto CleanUpFid;
366 }
367
368 iounit = fcall->params.rcreate.iounit;
369 qid = fcall->params.rcreate.qid;
370 kfree(fcall);
371
372 fid = v9fs_fid_create(file_dentry);
373 if (!fid) {
374 result = -ENOMEM;
375 goto CleanUpFid;
376 }
377
378 fid->fid = newfid;
379 fid->fidopen = 0;
380 fid->fidcreate = 1;
381 fid->qid = qid;
382 fid->iounit = iounit;
383 fid->rdir_pos = 0;
384 fid->rdir_fcall = NULL;
385 fid->v9ses = v9ses;
386
387 if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) ||
388 (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) ||
389 (perm & V9FS_DMDEVICE))
390 return 0;
391
392 result = v9fs_t_stat(v9ses, newfid, &fcall);
393 if (result < 0) {
394 dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall),
395 result);
396 goto CleanUpFid;
397 }
398
399 v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
400
401 file_inode = v9fs_get_inode(sb, newstat.st_mode);
402 if ((!file_inode) || IS_ERR(file_inode)) {
403 dprintk(DEBUG_ERROR, "create inode failed\n");
404 result = -EBADF;
405 goto CleanUpFid;
406 }
407
408 v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb);
409 kfree(fcall);
410 d_instantiate(file_dentry, file_inode);
411
412 if (perm & V9FS_DMDIR) {
413 if (v9fs_t_clunk(v9ses, newfid, &fcall))
414 dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n",
415 FCALL_ERROR(fcall));
416
417 v9fs_put_idpool(newfid, &v9ses->fidpool);
418 kfree(fcall);
419 fid->fidopen = 0;
420 fid->fidcreate = 0;
421 d_drop(file_dentry);
422 }
423
424 return 0;
425
426 CleanUpFid:
427 kfree(fcall);
428
429 if (newfid) {
430 if (v9fs_t_clunk(v9ses, newfid, &fcall))
431 dprintk(DEBUG_ERROR, "clunk failed: %s\n",
432 FCALL_ERROR(fcall));
433
434 v9fs_put_idpool(newfid, &v9ses->fidpool);
435 kfree(fcall);
436 }
437 return result;
438}
439
440/**
441 * v9fs_remove - helper function to remove files and directories
442 * @dir: directory inode that is being deleted
443 * @file: dentry that is being deleted
444 * @rmdir: removing a directory
445 *
446 */
447
448static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
449{
450 struct v9fs_fcall *fcall = NULL;
451 struct super_block *sb = NULL;
452 struct v9fs_session_info *v9ses = NULL;
453 struct v9fs_fid *v9fid = NULL;
454 struct inode *file_inode = NULL;
455 int fid = -1;
456 int result = 0;
457
458 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
459 rmdir);
460
461 file_inode = file->d_inode;
462 sb = file_inode->i_sb;
463 v9ses = v9fs_inode2v9ses(file_inode);
464 v9fid = v9fs_fid_lookup(file, FID_OP);
465
466 if (!v9fid) {
467 dprintk(DEBUG_ERROR,
468 "no v9fs_fid\n");
469 return -EBADF;
470 }
471
472 fid = v9fid->fid;
473 if (fid < 0) {
474 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
475 file_inode->i_ino);
476 return -EBADF;
477 }
478
479 result = v9fs_t_remove(v9ses, fid, &fcall);
480 if (result < 0)
481 dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n",
482 FCALL_ERROR(fcall), result);
483 else {
484 v9fs_put_idpool(fid, &v9ses->fidpool);
485 v9fs_fid_destroy(v9fid);
486 }
487
488 kfree(fcall);
489 return result;
490}
491
492/**
493 * v9fs_vfs_create - VFS hook to create files
494 * @inode: directory inode that is being deleted
495 * @dentry: dentry that is being deleted
496 * @perm: create permissions
497 * @nd: path information
498 *
499 */
500
501static int
502v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
503 struct nameidata *nd)
504{
505 return v9fs_create(inode, dentry, perm, O_RDWR);
506}
507
508/**
509 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
510 * @inode: inode that is being unlinked
511 * @dentry: dentry that is being unlinked
512 * @mode: mode for new directory
513 *
514 */
515
516static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode)
517{
518 return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY);
519}
520
521/**
522 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
523 * @dir: inode that is being walked from
524 * @dentry: dentry that is being walked to?
525 * @nameidata: path data
526 *
527 */
528
529static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
530 struct nameidata *nameidata)
531{
532 struct super_block *sb;
533 struct v9fs_session_info *v9ses;
534 struct v9fs_fid *dirfid;
535 struct v9fs_fid *fid;
536 struct inode *inode;
537 struct v9fs_fcall *fcall = NULL;
538 struct stat newstat;
539 int dirfidnum = -1;
540 int newfid = -1;
541 int result = 0;
542
543 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
544 dir, dentry->d_iname, dentry, nameidata);
545
546 sb = dir->i_sb;
547 v9ses = v9fs_inode2v9ses(dir);
548 dirfid = v9fs_fid_lookup(dentry->d_parent, FID_WALK);
549
550 if (!dirfid) {
551 dprintk(DEBUG_ERROR, "no dirfid\n");
552 return ERR_PTR(-EINVAL);
553 }
554
555 dirfidnum = dirfid->fid;
556
557 if (dirfidnum < 0) {
558 dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n",
559 dir, dir->i_ino);
560 return ERR_PTR(-EBADF);
561 }
562
563 newfid = v9fs_get_idpool(&v9ses->fidpool);
564 if (newfid < 0) {
565 eprintk(KERN_WARNING, "newfid fails!\n");
566 return ERR_PTR(-ENOSPC);
567 }
568
569 result =
570 v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name,
571 NULL);
572 if (result < 0) {
573 v9fs_put_idpool(newfid, &v9ses->fidpool);
574 if (result == -ENOENT) {
575 d_add(dentry, NULL);
576 dprintk(DEBUG_ERROR,
577 "Return negative dentry %p count %d\n",
578 dentry, atomic_read(&dentry->d_count));
579 return NULL;
580 }
581 dprintk(DEBUG_ERROR, "walk error:%d\n", result);
582 goto FreeFcall;
583 }
584
585 result = v9fs_t_stat(v9ses, newfid, &fcall);
586 if (result < 0) {
587 dprintk(DEBUG_ERROR, "stat error\n");
588 goto FreeFcall;
589 }
590
591 v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
592 inode = v9fs_get_inode(sb, newstat.st_mode);
593
594 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
595 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
596 PTR_ERR(inode));
597
598 result = -ENOSPC;
599 goto FreeFcall;
600 }
601
602 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid);
603
604 fid = v9fs_fid_create(dentry);
605 if (fid == NULL) {
606 dprintk(DEBUG_ERROR, "couldn't insert\n");
607 result = -ENOMEM;
608 goto FreeFcall;
609 }
610
611 fid->fid = newfid;
612 fid->fidopen = 0;
613 fid->v9ses = v9ses;
614 fid->qid = fcall->params.rstat.stat->qid;
615
616 dentry->d_op = &v9fs_dentry_operations;
617 v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb);
618
619 d_add(dentry, inode);
620 kfree(fcall);
621
622 return NULL;
623
624 FreeFcall:
625 kfree(fcall);
626 return ERR_PTR(result);
627}
628
629/**
630 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
631 * @i: inode that is being unlinked
632 * @d: dentry that is being unlinked
633 *
634 */
635
636static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
637{
638 return v9fs_remove(i, d, 0);
639}
640
641/**
642 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
643 * @i: inode that is being unlinked
644 * @d: dentry that is being unlinked
645 *
646 */
647
648static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
649{
650 return v9fs_remove(i, d, 1);
651}
652
653/**
654 * v9fs_vfs_rename - VFS hook to rename an inode
655 * @old_dir: old dir inode
656 * @old_dentry: old dentry
657 * @new_dir: new dir inode
658 * @new_dentry: new dentry
659 *
660 */
661
662static int
663v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
664 struct inode *new_dir, struct dentry *new_dentry)
665{
666 struct inode *old_inode = old_dentry->d_inode;
667 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
668 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_WALK);
669 struct v9fs_fid *olddirfid =
670 v9fs_fid_lookup(old_dentry->d_parent, FID_WALK);
671 struct v9fs_fid *newdirfid =
672 v9fs_fid_lookup(new_dentry->d_parent, FID_WALK);
673 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
674 struct v9fs_fcall *fcall = NULL;
675 int fid = -1;
676 int olddirfidnum = -1;
677 int newdirfidnum = -1;
678 int retval = 0;
679
680 dprintk(DEBUG_VFS, "\n");
681
682 if (!mistat)
683 return -ENOMEM;
684
685 if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
686 dprintk(DEBUG_ERROR, "problem with arguments\n");
687 return -EBADF;
688 }
689
690 /* 9P can only handle file rename in the same directory */
691 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
692 dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
693 retval = -EPERM;
694 goto FreeFcallnBail;
695 }
696
697 fid = oldfid->fid;
698 olddirfidnum = olddirfid->fid;
699 newdirfidnum = newdirfid->fid;
700
701 if (fid < 0) {
702 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
703 old_inode->i_ino);
704 retval = -EBADF;
705 goto FreeFcallnBail;
706 }
707
708 v9fs_blank_mistat(v9ses, mistat);
709
710 strcpy(mistat->data + 1, v9ses->name);
711 mistat->name = mistat->data + 1 + strlen(v9ses->name);
712
713 if (new_dentry->d_name.len >
714 (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) {
715 dprintk(DEBUG_ERROR, "new name too long\n");
716 goto FreeFcallnBail;
717 }
718
719 strcpy(mistat->name, new_dentry->d_name.name);
720 retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall);
721
722 FreeFcallnBail:
723 kfree(mistat);
724
725 if (retval < 0)
726 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
727 FCALL_ERROR(fcall));
728
729 kfree(fcall);
730 return retval;
731}
732
733/**
734 * v9fs_vfs_getattr - retreive file metadata
735 * @mnt - mount information
736 * @dentry - file to get attributes on
737 * @stat - metadata structure to populate
738 *
739 */
740
741static int
742v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
743 struct kstat *stat)
744{
745 struct v9fs_fcall *fcall = NULL;
746 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
747 struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP);
748 int err = -EPERM;
749
750 dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
751 if (!fid) {
752 dprintk(DEBUG_ERROR,
753 "couldn't find fid associated with dentry\n");
754 return -EBADF;
755 }
756
757 err = v9fs_t_stat(v9ses, fid->fid, &fcall);
758
759 if (err < 0)
760 dprintk(DEBUG_ERROR, "stat error\n");
761 else {
762 v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode,
763 dentry->d_inode->i_sb);
764 generic_fillattr(dentry->d_inode, stat);
765 }
766
767 kfree(fcall);
768 return err;
769}
770
771/**
772 * v9fs_vfs_setattr - set file metadata
773 * @dentry: file whose metadata to set
774 * @iattr: metadata assignment structure
775 *
776 */
777
778static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
779{
780 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
781 struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP);
782 struct v9fs_fcall *fcall = NULL;
783 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
784 int res = -EPERM;
785
786 dprintk(DEBUG_VFS, "\n");
787
788 if (!mistat)
789 return -ENOMEM;
790
791 if (!fid) {
792 dprintk(DEBUG_ERROR,
793 "Couldn't find fid associated with dentry\n");
794 return -EBADF;
795 }
796
797 v9fs_blank_mistat(v9ses, mistat);
798 if (iattr->ia_valid & ATTR_MODE)
799 mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode);
800
801 if (iattr->ia_valid & ATTR_MTIME)
802 mistat->mtime = iattr->ia_mtime.tv_sec;
803
804 if (iattr->ia_valid & ATTR_ATIME)
805 mistat->atime = iattr->ia_atime.tv_sec;
806
807 if (iattr->ia_valid & ATTR_SIZE)
808 mistat->length = iattr->ia_size;
809
810 if (v9ses->extended) {
811 char *ptr = mistat->data+1;
812
813 if (iattr->ia_valid & ATTR_UID) {
814 mistat->uid = ptr;
815 ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid);
816 mistat->n_uid = iattr->ia_uid;
817 }
818
819 if (iattr->ia_valid & ATTR_GID) {
820 mistat->gid = ptr;
821 ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid);
822 mistat->n_gid = iattr->ia_gid;
823 }
824 }
825
826 res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall);
827
828 if (res < 0)
829 dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall));
830
831 kfree(mistat);
832 kfree(fcall);
833
834 if (res >= 0)
835 res = inode_setattr(dentry->d_inode, iattr);
836
837 return res;
838}
839
840/**
841 * v9fs_mistat2inode - populate an inode structure with mistat info
842 * @mistat: Plan 9 metadata (mistat) structure
843 * @inode: inode to populate
844 * @sb: superblock of filesystem
845 *
846 */
847
848void
849v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode,
850 struct super_block *sb)
851{
852 struct v9fs_session_info *v9ses = sb->s_fs_info;
853
854 inode->i_nlink = 1;
855
856 inode->i_atime.tv_sec = mistat->atime;
857 inode->i_mtime.tv_sec = mistat->mtime;
858 inode->i_ctime.tv_sec = mistat->mtime;
859
860 inode->i_uid = -1;
861 inode->i_gid = -1;
862
863 if (v9ses->extended) {
864 /* TODO: string to uid mapping via user-space daemon */
865 inode->i_uid = mistat->n_uid;
866 inode->i_gid = mistat->n_gid;
867
868 if (mistat->n_uid == -1)
869 sscanf(mistat->uid, "%x", &inode->i_uid);
870
871 if (mistat->n_gid == -1)
872 sscanf(mistat->gid, "%x", &inode->i_gid);
873 }
874
875 if (inode->i_uid == -1)
876 inode->i_uid = v9ses->uid;
877 if (inode->i_gid == -1)
878 inode->i_gid = v9ses->gid;
879
880 inode->i_mode = p9mode2unixmode(v9ses, mistat->mode);
881 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
882 char type = 0;
883 int major = -1;
884 int minor = -1;
885 sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
886 switch (type) {
887 case 'c':
888 inode->i_mode &= ~S_IFBLK;
889 inode->i_mode |= S_IFCHR;
890 break;
891 case 'b':
892 break;
893 default:
894 dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
895 type, mistat->extension);
896 };
897 inode->i_rdev = MKDEV(major, minor);
898 } else
899 inode->i_rdev = 0;
900
901 inode->i_size = mistat->length;
902
903 inode->i_blksize = sb->s_blocksize;
904 inode->i_blocks =
905 (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits;
906}
907
908/**
909 * v9fs_qid2ino - convert qid into inode number
910 * @qid: qid to hash
911 *
912 * BUG: potential for inode number collisions?
913 */
914
915ino_t v9fs_qid2ino(struct v9fs_qid *qid)
916{
917 u64 path = qid->path + 2;
918 ino_t i = 0;
919
920 if (sizeof(ino_t) == sizeof(path))
921 memcpy(&i, &path, sizeof(ino_t));
922 else
923 i = (ino_t) (path ^ (path >> 32));
924
925 return i;
926}
927
928/**
929 * v9fs_vfs_symlink - helper function to create symlinks
930 * @dir: directory inode containing symlink
931 * @dentry: dentry for symlink
932 * @symname: symlink data
933 *
934 * See 9P2000.u RFC for more information
935 *
936 */
937
938static int
939v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
940{
941 int retval = -EPERM;
942 struct v9fs_fid *newfid;
943 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
944 struct v9fs_fcall *fcall = NULL;
945 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
946
947 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
948 symname);
949
950 if (!mistat)
951 return -ENOMEM;
952
953 if (!v9ses->extended) {
954 dprintk(DEBUG_ERROR, "not extended\n");
955 goto FreeFcall;
956 }
957
958 /* issue a create */
959 retval = v9fs_create(dir, dentry, S_IFLNK, 0);
960 if (retval != 0)
961 goto FreeFcall;
962
963 newfid = v9fs_fid_lookup(dentry, FID_OP);
964
965 /* issue a twstat */
966 v9fs_blank_mistat(v9ses, mistat);
967 strcpy(mistat->data + 1, symname);
968 mistat->extension = mistat->data + 1;
969 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
970 if (retval < 0) {
971 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
972 FCALL_ERROR(fcall));
973 goto FreeFcall;
974 }
975
976 kfree(fcall);
977
978 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
979 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
980 FCALL_ERROR(fcall));
981 goto FreeFcall;
982 }
983
984 d_drop(dentry); /* FID - will this also clunk? */
985
986 FreeFcall:
987 kfree(mistat);
988 kfree(fcall);
989
990 return retval;
991}
992
993/**
994 * v9fs_readlink - read a symlink's location (internal version)
995 * @dentry: dentry for symlink
996 * @buffer: buffer to load symlink location into
997 * @buflen: length of buffer
998 *
999 */
1000
1001static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1002{
1003 int retval = -EPERM;
1004
1005 struct v9fs_fcall *fcall = NULL;
1006 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
1007 struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP);
1008
1009 if (!fid) {
1010 dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n");
1011 retval = -EBADF;
1012 goto FreeFcall;
1013 }
1014
1015 if (!v9ses->extended) {
1016 retval = -EBADF;
1017 dprintk(DEBUG_ERROR, "not extended\n");
1018 goto FreeFcall;
1019 }
1020
1021 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
1022 retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
1023
1024 if (retval < 0) {
1025 dprintk(DEBUG_ERROR, "stat error\n");
1026 goto FreeFcall;
1027 }
1028
1029 if (!fcall)
1030 return -EIO;
1031
1032 if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) {
1033 retval = -EINVAL;
1034 goto FreeFcall;
1035 }
1036
1037 /* copy extension buffer into buffer */
1038 if (strlen(fcall->params.rstat.stat->extension) < buflen)
1039 buflen = strlen(fcall->params.rstat.stat->extension);
1040
1041 memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1);
1042
1043 retval = buflen;
1044
1045 FreeFcall:
1046 kfree(fcall);
1047
1048 return retval;
1049}
1050
1051/**
1052 * v9fs_vfs_readlink - read a symlink's location
1053 * @dentry: dentry for symlink
1054 * @buf: buffer to load symlink location into
1055 * @buflen: length of buffer
1056 *
1057 */
1058
1059static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
1060 int buflen)
1061{
1062 int retval;
1063 int ret;
1064 char *link = __getname();
1065
1066 if (strlen(link) < buflen)
1067 buflen = strlen(link);
1068
1069 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
1070
1071 retval = v9fs_readlink(dentry, link, buflen);
1072
1073 if (retval > 0) {
1074 if ((ret = copy_to_user(buffer, link, retval)) != 0) {
1075 dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
1076 ret);
1077 retval = ret;
1078 }
1079 }
1080
1081 putname(link);
1082 return retval;
1083}
1084
1085/**
1086 * v9fs_vfs_follow_link - follow a symlink path
1087 * @dentry: dentry for symlink
1088 * @nd: nameidata
1089 *
1090 */
1091
1092static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1093{
1094 int len = 0;
1095 char *link = __getname();
1096
1097 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
1098
1099 if (!link)
1100 link = ERR_PTR(-ENOMEM);
1101 else {
1102 len = v9fs_readlink(dentry, link, strlen(link));
1103
1104 if (len < 0) {
1105 putname(link);
1106 link = ERR_PTR(len);
1107 } else
1108 link[len] = 0;
1109 }
1110 nd_set_link(nd, link);
1111
1112 return NULL;
1113}
1114
1115/**
1116 * v9fs_vfs_put_link - release a symlink path
1117 * @dentry: dentry for symlink
1118 * @nd: nameidata
1119 *
1120 */
1121
1122static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1123{
1124 char *s = nd_get_link(nd);
1125
1126 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
1127 if (!IS_ERR(s))
1128 putname(s);
1129}
1130
1131/**
1132 * v9fs_vfs_link - create a hardlink
1133 * @old_dentry: dentry for file to link to
1134 * @dir: inode destination for new link
1135 * @dentry: dentry for link
1136 *
1137 */
1138
1139/* XXX - lots of code dup'd from symlink and creates,
1140 * figure out a better reuse strategy
1141 */
1142
1143static int
1144v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1145 struct dentry *dentry)
1146{
1147 int retval = -EPERM;
1148 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1149 struct v9fs_fcall *fcall = NULL;
1150 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
1151 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry, FID_OP);
1152 struct v9fs_fid *newfid = NULL;
1153 char *symname = __getname();
1154
1155 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1156 old_dentry->d_name.name);
1157
1158 if (!v9ses->extended) {
1159 dprintk(DEBUG_ERROR, "not extended\n");
1160 goto FreeMem;
1161 }
1162
1163 /* get fid of old_dentry */
1164 sprintf(symname, "hardlink(%d)\n", oldfid->fid);
1165
1166 /* issue a create */
1167 retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0);
1168 if (retval != 0)
1169 goto FreeMem;
1170
1171 newfid = v9fs_fid_lookup(dentry, FID_OP);
1172 if (!newfid) {
1173 dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
1174 goto FreeMem;
1175 }
1176
1177 /* issue a twstat */
1178 v9fs_blank_mistat(v9ses, mistat);
1179 strcpy(mistat->data + 1, symname);
1180 mistat->extension = mistat->data + 1;
1181 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1182 if (retval < 0) {
1183 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1184 FCALL_ERROR(fcall));
1185 goto FreeMem;
1186 }
1187
1188 kfree(fcall);
1189
1190 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1191 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1192 FCALL_ERROR(fcall));
1193 goto FreeMem;
1194 }
1195
1196 d_drop(dentry); /* FID - will this also clunk? */
1197
1198 kfree(fcall);
1199 fcall = NULL;
1200
1201 FreeMem:
1202 kfree(mistat);
1203 kfree(fcall);
1204 putname(symname);
1205 return retval;
1206}
1207
1208/**
1209 * v9fs_vfs_mknod - create a special file
1210 * @dir: inode destination for new link
1211 * @dentry: dentry for file
1212 * @mode: mode for creation
1213 * @dev_t: device associated with special file
1214 *
1215 */
1216
1217static int
1218v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1219{
1220 int retval = -EPERM;
1221 struct v9fs_fid *newfid;
1222 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1223 struct v9fs_fcall *fcall = NULL;
1224 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
1225 char *symname = __getname();
1226
1227 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1228 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1229
1230 if (!mistat)
1231 return -ENOMEM;
1232
1233 if (!new_valid_dev(rdev)) {
1234 retval = -EINVAL;
1235 goto FreeMem;
1236 }
1237
1238 if (!v9ses->extended) {
1239 dprintk(DEBUG_ERROR, "not extended\n");
1240 goto FreeMem;
1241 }
1242
1243 /* issue a create */
1244 retval = v9fs_create(dir, dentry, mode, 0);
1245
1246 if (retval != 0)
1247 goto FreeMem;
1248
1249 newfid = v9fs_fid_lookup(dentry, FID_OP);
1250 if (!newfid) {
1251 dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n");
1252 retval = -EINVAL;
1253 goto FreeMem;
1254 }
1255
1256 /* build extension */
1257 if (S_ISBLK(mode))
1258 sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev));
1259 else if (S_ISCHR(mode))
1260 sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev));
1261 else if (S_ISFIFO(mode))
1262 ; /* DO NOTHING */
1263 else {
1264 retval = -EINVAL;
1265 goto FreeMem;
1266 }
1267
1268 if (!S_ISFIFO(mode)) {
1269 /* issue a twstat */
1270 v9fs_blank_mistat(v9ses, mistat);
1271 strcpy(mistat->data + 1, symname);
1272 mistat->extension = mistat->data + 1;
1273 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1274 if (retval < 0) {
1275 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1276 FCALL_ERROR(fcall));
1277 goto FreeMem;
1278 }
1279 }
1280
1281 /* need to update dcache so we show up */
1282 kfree(fcall);
1283
1284 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1285 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1286 FCALL_ERROR(fcall));
1287 goto FreeMem;
1288 }
1289
1290 d_drop(dentry); /* FID - will this also clunk? */
1291
1292 FreeMem:
1293 kfree(mistat);
1294 kfree(fcall);
1295 putname(symname);
1296
1297 return retval;
1298}
1299
1300static struct inode_operations v9fs_dir_inode_operations_ext = {
1301 .create = v9fs_vfs_create,
1302 .lookup = v9fs_vfs_lookup,
1303 .symlink = v9fs_vfs_symlink,
1304 .link = v9fs_vfs_link,
1305 .unlink = v9fs_vfs_unlink,
1306 .mkdir = v9fs_vfs_mkdir,
1307 .rmdir = v9fs_vfs_rmdir,
1308 .mknod = v9fs_vfs_mknod,
1309 .rename = v9fs_vfs_rename,
1310 .readlink = v9fs_vfs_readlink,
1311 .getattr = v9fs_vfs_getattr,
1312 .setattr = v9fs_vfs_setattr,
1313};
1314
1315static struct inode_operations v9fs_dir_inode_operations = {
1316 .create = v9fs_vfs_create,
1317 .lookup = v9fs_vfs_lookup,
1318 .unlink = v9fs_vfs_unlink,
1319 .mkdir = v9fs_vfs_mkdir,
1320 .rmdir = v9fs_vfs_rmdir,
1321 .mknod = v9fs_vfs_mknod,
1322 .rename = v9fs_vfs_rename,
1323 .getattr = v9fs_vfs_getattr,
1324 .setattr = v9fs_vfs_setattr,
1325};
1326
1327static struct inode_operations v9fs_file_inode_operations = {
1328 .getattr = v9fs_vfs_getattr,
1329 .setattr = v9fs_vfs_setattr,
1330};
1331
1332static struct inode_operations v9fs_symlink_inode_operations = {
1333 .readlink = v9fs_vfs_readlink,
1334 .follow_link = v9fs_vfs_follow_link,
1335 .put_link = v9fs_vfs_put_link,
1336 .getattr = v9fs_vfs_getattr,
1337 .setattr = v9fs_vfs_setattr,
1338};
generated by cgit v1.2.2 (git 2.25.0) at 2025-11-09 02:49:21 -0500