blob: 05d30e89ba45104d3232b4c19c00162c09c1666a [file] [log] [blame]
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001/*
2 * linux/fs/9p/vfs_inode.c
3 *
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07004 * This file contains vfs inode ops for the 9P2000 protocol.
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07005 *
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
Eric Van Hensbergen42e8c502006-03-25 03:07:28 -080010 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070012 *
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/smp_lock.h>
34#include <linux/inet.h>
35#include <linux/namei.h>
36#include <linux/idr.h>
37
38#include "debug.h"
39#include "v9fs.h"
40#include "9p.h"
41#include "v9fs_vfs.h"
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070042#include "fid.h"
43
44static struct inode_operations v9fs_dir_inode_operations;
Eric Van Hensbergenb5016112005-09-09 13:04:27 -070045static struct inode_operations v9fs_dir_inode_operations_ext;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070046static struct inode_operations v9fs_file_inode_operations;
47static struct inode_operations v9fs_symlink_inode_operations;
48
49/**
50 * unixmode2p9mode - convert unix mode bits to plan 9
51 * @v9ses: v9fs session information
52 * @mode: mode to convert
53 *
54 */
55
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -070056static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070057{
58 int res;
59 res = mode & 0777;
60 if (S_ISDIR(mode))
61 res |= V9FS_DMDIR;
62 if (v9ses->extended) {
63 if (S_ISLNK(mode))
64 res |= V9FS_DMSYMLINK;
65 if (v9ses->nodev == 0) {
66 if (S_ISSOCK(mode))
67 res |= V9FS_DMSOCKET;
68 if (S_ISFIFO(mode))
69 res |= V9FS_DMNAMEDPIPE;
70 if (S_ISBLK(mode))
71 res |= V9FS_DMDEVICE;
72 if (S_ISCHR(mode))
73 res |= V9FS_DMDEVICE;
74 }
75
76 if ((mode & S_ISUID) == S_ISUID)
77 res |= V9FS_DMSETUID;
78 if ((mode & S_ISGID) == S_ISGID)
79 res |= V9FS_DMSETGID;
80 if ((mode & V9FS_DMLINK))
81 res |= V9FS_DMLINK;
82 }
83
84 return res;
85}
86
87/**
88 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
89 * @v9ses: v9fs session information
90 * @mode: mode to convert
91 *
92 */
93
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -070094static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070095{
96 int res;
97
98 res = mode & 0777;
99
100 if ((mode & V9FS_DMDIR) == V9FS_DMDIR)
101 res |= S_IFDIR;
102 else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
103 res |= S_IFLNK;
104 else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
105 && (v9ses->nodev == 0))
106 res |= S_IFSOCK;
107 else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
108 && (v9ses->nodev == 0))
109 res |= S_IFIFO;
110 else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
111 && (v9ses->nodev == 0))
112 res |= S_IFBLK;
113 else
114 res |= S_IFREG;
115
116 if (v9ses->extended) {
117 if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
118 res |= S_ISUID;
119
120 if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
121 res |= S_ISGID;
122 }
123
124 return res;
125}
126
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800127int v9fs_uflags2omode(int uflags)
128{
129 int ret;
130
131 ret = 0;
132 switch (uflags&3) {
133 default:
134 case O_RDONLY:
135 ret = V9FS_OREAD;
136 break;
137
138 case O_WRONLY:
139 ret = V9FS_OWRITE;
140 break;
141
142 case O_RDWR:
143 ret = V9FS_ORDWR;
144 break;
145 }
146
147 if (uflags & O_EXCL)
148 ret |= V9FS_OEXCL;
149
150 if (uflags & O_TRUNC)
151 ret |= V9FS_OTRUNC;
152
153 if (uflags & O_APPEND)
154 ret |= V9FS_OAPPEND;
155
156 return ret;
157}
158
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700159/**
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800160 * v9fs_blank_wstat - helper function to setup a 9P stat structure
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700161 * @v9ses: 9P session info (for determining extended mode)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800162 * @wstat: structure to initialize
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700163 *
164 */
165
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700166static void
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800167v9fs_blank_wstat(struct v9fs_wstat *wstat)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700168{
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800169 wstat->type = ~0;
170 wstat->dev = ~0;
171 wstat->qid.type = ~0;
172 wstat->qid.version = ~0;
173 *((long long *)&wstat->qid.path) = ~0;
174 wstat->mode = ~0;
175 wstat->atime = ~0;
176 wstat->mtime = ~0;
177 wstat->length = ~0;
178 wstat->name = NULL;
179 wstat->uid = NULL;
180 wstat->gid = NULL;
181 wstat->muid = NULL;
182 wstat->n_uid = ~0;
183 wstat->n_gid = ~0;
184 wstat->n_muid = ~0;
185 wstat->extension = NULL;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700186}
187
188/**
189 * v9fs_get_inode - helper function to setup an inode
190 * @sb: superblock
191 * @mode: mode to setup inode with
192 *
193 */
194
195struct inode *v9fs_get_inode(struct super_block *sb, int mode)
196{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800197 struct inode *inode;
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700198 struct v9fs_session_info *v9ses = sb->s_fs_info;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700199
200 dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
201
202 inode = new_inode(sb);
203 if (inode) {
204 inode->i_mode = mode;
205 inode->i_uid = current->fsuid;
206 inode->i_gid = current->fsgid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700207 inode->i_blocks = 0;
208 inode->i_rdev = 0;
209 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
Eric Van Hensbergen147b31c2006-01-18 17:43:02 -0800210 inode->i_mapping->a_ops = &v9fs_addr_operations;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700211
212 switch (mode & S_IFMT) {
213 case S_IFIFO:
214 case S_IFBLK:
215 case S_IFCHR:
216 case S_IFSOCK:
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700217 if(!v9ses->extended) {
218 dprintk(DEBUG_ERROR, "special files without extended mode\n");
219 return ERR_PTR(-EINVAL);
220 }
Eric Van Hensbergen5d58bec2005-09-09 13:04:27 -0700221 init_special_inode(inode, inode->i_mode,
222 inode->i_rdev);
223 break;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700224 case S_IFREG:
225 inode->i_op = &v9fs_file_inode_operations;
226 inode->i_fop = &v9fs_file_operations;
227 break;
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700228 case S_IFLNK:
229 if(!v9ses->extended) {
230 dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n");
231 return ERR_PTR(-EINVAL);
232 }
233 inode->i_op = &v9fs_symlink_inode_operations;
234 break;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700235 case S_IFDIR:
Dave Hansend8c76e62006-09-30 23:29:04 -0700236 inc_nlink(inode);
Eric Van Hensbergenb5016112005-09-09 13:04:27 -0700237 if(v9ses->extended)
238 inode->i_op = &v9fs_dir_inode_operations_ext;
239 else
240 inode->i_op = &v9fs_dir_inode_operations;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700241 inode->i_fop = &v9fs_dir_operations;
242 break;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700243 default:
244 dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
245 mode, mode & S_IFMT);
246 return ERR_PTR(-EINVAL);
247 }
248 } else {
249 eprintk(KERN_WARNING, "Problem allocating inode\n");
250 return ERR_PTR(-ENOMEM);
251 }
252 return inode;
253}
254
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700255static int
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800256v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm,
257 u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700258{
Mika Kukkonen736c4b82006-12-06 20:36:29 -0800259 int fid;
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800260 int err;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800261 struct v9fs_fcall *fcall;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700262
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800263 fid = v9fs_get_idpool(&v9ses->fidpool);
264 if (fid < 0) {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700265 eprintk(KERN_WARNING, "no free fids available\n");
Latchesar Ionkov731805b2006-03-07 21:55:42 -0800266 return -ENOSPC;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700267 }
268
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800269 err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall);
270 if (err < 0) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800271 PRINT_FCALL_ERROR("clone error", fcall);
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700272 if (fcall && fcall->id == RWALK)
273 goto clunk_fid;
274 else
275 goto put_fid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700276 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700277 kfree(fcall);
278
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800279 err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800280 if (err < 0) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800281 PRINT_FCALL_ERROR("create fails", fcall);
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800282 goto clunk_fid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700283 }
284
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800285 if (iounit)
286 *iounit = fcall->params.rcreate.iounit;
287
288 if (qid)
289 *qid = fcall->params.rcreate.qid;
290
291 if (fidp)
292 *fidp = fid;
293
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700294 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700295 return 0;
296
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800297clunk_fid:
298 v9fs_t_clunk(v9ses, fid);
299 fid = V9FS_NOFID;
300
301put_fid:
Latchesar Ionkov9d7fa402006-06-28 04:26:51 -0700302 if (fid != V9FS_NOFID)
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800303 v9fs_put_idpool(fid, &v9ses->fidpool);
304
305 kfree(fcall);
306 return err;
307}
308
309static struct v9fs_fid*
310v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
311{
312 int err;
Mika Kukkonen736c4b82006-12-06 20:36:29 -0800313 int nfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800314 struct v9fs_fid *ret;
315 struct v9fs_fcall *fcall;
316
317 nfid = v9fs_get_idpool(&v9ses->fidpool);
318 if (nfid < 0) {
319 eprintk(KERN_WARNING, "no free fids available\n");
Latchesar Ionkov731805b2006-03-07 21:55:42 -0800320 return ERR_PTR(-ENOSPC);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800321 }
322
323 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
324 &fcall);
325
326 if (err < 0) {
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700327 if (fcall && fcall->id == RWALK)
328 goto clunk_fid;
329
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800330 PRINT_FCALL_ERROR("walk error", fcall);
331 v9fs_put_idpool(nfid, &v9ses->fidpool);
332 goto error;
333 }
334
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700335 kfree(fcall);
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800336 fcall = NULL;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800337 ret = v9fs_fid_create(v9ses, nfid);
338 if (!ret) {
339 err = -ENOMEM;
340 goto clunk_fid;
341 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700342
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800343 err = v9fs_fid_insert(ret, dentry);
344 if (err < 0) {
345 v9fs_fid_destroy(ret);
346 goto clunk_fid;
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700347 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800348
349 return ret;
350
351clunk_fid:
352 v9fs_t_clunk(v9ses, nfid);
353
354error:
355 kfree(fcall);
356 return ERR_PTR(err);
357}
358
Latchesar Ionkov5174fda2006-03-25 03:07:25 -0800359static struct inode *
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800360v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid,
361 struct super_block *sb)
362{
363 int err, umode;
364 struct inode *ret;
365 struct v9fs_fcall *fcall;
366
367 ret = NULL;
368 err = v9fs_t_stat(v9ses, fid, &fcall);
369 if (err) {
370 PRINT_FCALL_ERROR("stat error", fcall);
371 goto error;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700372 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800373
374 umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode);
375 ret = v9fs_get_inode(sb, umode);
376 if (IS_ERR(ret)) {
377 err = PTR_ERR(ret);
378 ret = NULL;
379 goto error;
380 }
381
382 v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb);
383 kfree(fcall);
384 return ret;
385
386error:
387 kfree(fcall);
388 if (ret)
389 iput(ret);
390
391 return ERR_PTR(err);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700392}
393
394/**
395 * v9fs_remove - helper function to remove files and directories
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700396 * @dir: directory inode that is being deleted
397 * @file: dentry that is being deleted
398 * @rmdir: removing a directory
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700399 *
400 */
401
402static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
403{
404 struct v9fs_fcall *fcall = NULL;
405 struct super_block *sb = NULL;
406 struct v9fs_session_info *v9ses = NULL;
407 struct v9fs_fid *v9fid = NULL;
408 struct inode *file_inode = NULL;
409 int fid = -1;
410 int result = 0;
411
412 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
413 rmdir);
414
415 file_inode = file->d_inode;
416 sb = file_inode->i_sb;
417 v9ses = v9fs_inode2v9ses(file_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700418 v9fid = v9fs_fid_lookup(file);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700419
420 if (!v9fid) {
421 dprintk(DEBUG_ERROR,
422 "no v9fs_fid\n");
423 return -EBADF;
424 }
425
426 fid = v9fid->fid;
427 if (fid < 0) {
428 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
429 file_inode->i_ino);
430 return -EBADF;
431 }
432
433 result = v9fs_t_remove(v9ses, fid, &fcall);
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800434 if (result < 0) {
435 PRINT_FCALL_ERROR("remove fails", fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700436 }
437
Eric Van Hensbergen834a9b82006-07-30 03:04:16 -0700438 v9fs_put_idpool(fid, &v9ses->fidpool);
439 v9fs_fid_destroy(v9fid);
440
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700441 kfree(fcall);
442 return result;
443}
444
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800445static int
446v9fs_open_created(struct inode *inode, struct file *file)
447{
448 return 0;
449}
450
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700451/**
452 * v9fs_vfs_create - VFS hook to create files
453 * @inode: directory inode that is being deleted
454 * @dentry: dentry that is being deleted
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800455 * @mode: create permissions
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700456 * @nd: path information
457 *
458 */
459
460static int
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800461v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700462 struct nameidata *nd)
463{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800464 int err;
465 u32 fid, perm, iounit;
466 int flags;
467 struct v9fs_session_info *v9ses;
468 struct v9fs_fid *dfid, *vfid, *ffid;
469 struct inode *inode;
470 struct v9fs_qid qid;
471 struct file *filp;
472
473 inode = NULL;
474 vfid = NULL;
475 v9ses = v9fs_inode2v9ses(dir);
476 dfid = v9fs_fid_lookup(dentry->d_parent);
477 perm = unixmode2p9mode(v9ses, mode);
478
479 if (nd && nd->flags & LOOKUP_OPEN)
480 flags = nd->intent.open.flags - 1;
481 else
482 flags = O_RDWR;
483
484 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800485 perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800486
487 if (err)
488 goto error;
489
490 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
491 if (IS_ERR(vfid)) {
492 err = PTR_ERR(vfid);
493 vfid = NULL;
494 goto error;
495 }
496
497 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
498 if (IS_ERR(inode)) {
499 err = PTR_ERR(inode);
500 inode = NULL;
501 goto error;
502 }
503
504 dentry->d_op = &v9fs_dentry_operations;
505 d_instantiate(dentry, inode);
506
507 if (nd && nd->flags & LOOKUP_OPEN) {
508 ffid = v9fs_fid_create(v9ses, fid);
509 if (!ffid)
510 return -ENOMEM;
511
512 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
513 if (IS_ERR(filp)) {
514 v9fs_fid_destroy(ffid);
515 return PTR_ERR(filp);
516 }
517
518 ffid->rdir_pos = 0;
519 ffid->rdir_fcall = NULL;
520 ffid->fidopen = 1;
521 ffid->iounit = iounit;
522 ffid->filp = filp;
523 filp->private_data = ffid;
524 }
525
526 return 0;
527
528error:
529 if (vfid)
530 v9fs_fid_destroy(vfid);
531
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800532 return err;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700533}
534
535/**
536 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700537 * @inode: inode that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700538 * @dentry: dentry that is being unlinked
539 * @mode: mode for new directory
540 *
541 */
542
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800543static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700544{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800545 int err;
546 u32 fid, perm;
547 struct v9fs_session_info *v9ses;
548 struct v9fs_fid *dfid, *vfid;
549 struct inode *inode;
550
551 inode = NULL;
552 vfid = NULL;
553 v9ses = v9fs_inode2v9ses(dir);
554 dfid = v9fs_fid_lookup(dentry->d_parent);
555 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
556
557 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800558 perm, V9FS_OREAD, NULL, &fid, NULL, NULL);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800559
560 if (err) {
561 dprintk(DEBUG_ERROR, "create error %d\n", err);
562 goto error;
563 }
564
565 err = v9fs_t_clunk(v9ses, fid);
566 if (err) {
567 dprintk(DEBUG_ERROR, "clunk error %d\n", err);
568 goto error;
569 }
570
571 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
572 if (IS_ERR(vfid)) {
573 err = PTR_ERR(vfid);
574 vfid = NULL;
575 goto error;
576 }
577
578 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
579 if (IS_ERR(inode)) {
580 err = PTR_ERR(inode);
581 inode = NULL;
582 goto error;
583 }
584
585 dentry->d_op = &v9fs_dentry_operations;
586 d_instantiate(dentry, inode);
587 return 0;
588
589error:
590 if (vfid)
591 v9fs_fid_destroy(vfid);
592
593 return err;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700594}
595
596/**
597 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
598 * @dir: inode that is being walked from
599 * @dentry: dentry that is being walked to?
600 * @nameidata: path data
601 *
602 */
603
604static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
605 struct nameidata *nameidata)
606{
607 struct super_block *sb;
608 struct v9fs_session_info *v9ses;
609 struct v9fs_fid *dirfid;
610 struct v9fs_fid *fid;
611 struct inode *inode;
612 struct v9fs_fcall *fcall = NULL;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700613 int dirfidnum = -1;
614 int newfid = -1;
615 int result = 0;
616
617 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
Latchesar Ionkov731805b2006-03-07 21:55:42 -0800618 dir, dentry->d_name.name, dentry, nameidata);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700619
620 sb = dir->i_sb;
621 v9ses = v9fs_inode2v9ses(dir);
Latchesar Ionkov5e7a99a2006-03-22 00:07:37 -0800622 dentry->d_op = &v9fs_dentry_operations;
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700623 dirfid = v9fs_fid_lookup(dentry->d_parent);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700624
625 if (!dirfid) {
626 dprintk(DEBUG_ERROR, "no dirfid\n");
627 return ERR_PTR(-EINVAL);
628 }
629
630 dirfidnum = dirfid->fid;
631
632 if (dirfidnum < 0) {
633 dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n",
634 dir, dir->i_ino);
635 return ERR_PTR(-EBADF);
636 }
637
638 newfid = v9fs_get_idpool(&v9ses->fidpool);
639 if (newfid < 0) {
640 eprintk(KERN_WARNING, "newfid fails!\n");
641 return ERR_PTR(-ENOSPC);
642 }
643
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800644 result = v9fs_t_walk(v9ses, dirfidnum, newfid,
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700645 (char *)dentry->d_name.name, &fcall);
646
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700647 if (result < 0) {
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700648 if (fcall && fcall->id == RWALK)
649 v9fs_t_clunk(v9ses, newfid);
650 else
651 v9fs_put_idpool(newfid, &v9ses->fidpool);
652
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700653 if (result == -ENOENT) {
654 d_add(dentry, NULL);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700655 dprintk(DEBUG_VFS,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700656 "Return negative dentry %p count %d\n",
657 dentry, atomic_read(&dentry->d_count));
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700658 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700659 return NULL;
660 }
661 dprintk(DEBUG_ERROR, "walk error:%d\n", result);
662 goto FreeFcall;
663 }
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700664 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700665
666 result = v9fs_t_stat(v9ses, newfid, &fcall);
667 if (result < 0) {
668 dprintk(DEBUG_ERROR, "stat error\n");
669 goto FreeFcall;
670 }
671
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800672 inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses,
673 fcall->params.rstat.stat.mode));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700674
675 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
676 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
677 PTR_ERR(inode));
678
679 result = -ENOSPC;
680 goto FreeFcall;
681 }
682
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800683 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700684
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800685 fid = v9fs_fid_create(v9ses, newfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700686 if (fid == NULL) {
687 dprintk(DEBUG_ERROR, "couldn't insert\n");
688 result = -ENOMEM;
689 goto FreeFcall;
690 }
691
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800692 result = v9fs_fid_insert(fid, dentry);
693 if (result < 0)
694 goto FreeFcall;
695
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800696 fid->qid = fcall->params.rstat.stat.qid;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800697 v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700698
699 d_add(dentry, inode);
700 kfree(fcall);
701
702 return NULL;
703
704 FreeFcall:
705 kfree(fcall);
706 return ERR_PTR(result);
707}
708
709/**
710 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
711 * @i: inode that is being unlinked
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700712 * @d: dentry that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700713 *
714 */
715
716static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
717{
718 return v9fs_remove(i, d, 0);
719}
720
721/**
722 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
723 * @i: inode that is being unlinked
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700724 * @d: dentry that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700725 *
726 */
727
728static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
729{
730 return v9fs_remove(i, d, 1);
731}
732
733/**
734 * v9fs_vfs_rename - VFS hook to rename an inode
735 * @old_dir: old dir inode
736 * @old_dentry: old dentry
737 * @new_dir: new dir inode
738 * @new_dentry: new dentry
739 *
740 */
741
742static int
743v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
744 struct inode *new_dir, struct dentry *new_dentry)
745{
746 struct inode *old_inode = old_dentry->d_inode;
747 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700748 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700749 struct v9fs_fid *olddirfid =
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700750 v9fs_fid_lookup(old_dentry->d_parent);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700751 struct v9fs_fid *newdirfid =
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700752 v9fs_fid_lookup(new_dentry->d_parent);
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800753 struct v9fs_wstat wstat;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700754 struct v9fs_fcall *fcall = NULL;
755 int fid = -1;
756 int olddirfidnum = -1;
757 int newdirfidnum = -1;
758 int retval = 0;
759
760 dprintk(DEBUG_VFS, "\n");
761
762 if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
763 dprintk(DEBUG_ERROR, "problem with arguments\n");
764 return -EBADF;
765 }
766
767 /* 9P can only handle file rename in the same directory */
768 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
769 dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
Eric Van Hensbergen621997c2007-01-26 00:57:04 -0800770 retval = -EXDEV;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700771 goto FreeFcallnBail;
772 }
773
774 fid = oldfid->fid;
775 olddirfidnum = olddirfid->fid;
776 newdirfidnum = newdirfid->fid;
777
778 if (fid < 0) {
779 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
780 old_inode->i_ino);
781 retval = -EBADF;
782 goto FreeFcallnBail;
783 }
784
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800785 v9fs_blank_wstat(&wstat);
786 wstat.muid = v9ses->name;
787 wstat.name = (char *) new_dentry->d_name.name;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700788
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800789 retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700790
791 FreeFcallnBail:
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700792 if (retval < 0)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800793 PRINT_FCALL_ERROR("wstat error", fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700794
795 kfree(fcall);
796 return retval;
797}
798
799/**
Adrian Bunk943ffb52006-01-10 00:10:13 +0100800 * v9fs_vfs_getattr - retrieve file metadata
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700801 * @mnt - mount information
802 * @dentry - file to get attributes on
803 * @stat - metadata structure to populate
804 *
805 */
806
807static int
808v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
809 struct kstat *stat)
810{
811 struct v9fs_fcall *fcall = NULL;
812 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700813 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700814 int err = -EPERM;
815
816 dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
817 if (!fid) {
818 dprintk(DEBUG_ERROR,
819 "couldn't find fid associated with dentry\n");
820 return -EBADF;
821 }
822
823 err = v9fs_t_stat(v9ses, fid->fid, &fcall);
824
825 if (err < 0)
826 dprintk(DEBUG_ERROR, "stat error\n");
827 else {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800828 v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700829 dentry->d_inode->i_sb);
830 generic_fillattr(dentry->d_inode, stat);
831 }
832
833 kfree(fcall);
834 return err;
835}
836
837/**
838 * v9fs_vfs_setattr - set file metadata
839 * @dentry: file whose metadata to set
840 * @iattr: metadata assignment structure
841 *
842 */
843
844static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
845{
846 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700847 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700848 struct v9fs_fcall *fcall = NULL;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800849 struct v9fs_wstat wstat;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700850 int res = -EPERM;
851
852 dprintk(DEBUG_VFS, "\n");
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700853
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700854 if (!fid) {
855 dprintk(DEBUG_ERROR,
856 "Couldn't find fid associated with dentry\n");
857 return -EBADF;
858 }
859
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800860 v9fs_blank_wstat(&wstat);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700861 if (iattr->ia_valid & ATTR_MODE)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800862 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700863
864 if (iattr->ia_valid & ATTR_MTIME)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800865 wstat.mtime = iattr->ia_mtime.tv_sec;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700866
867 if (iattr->ia_valid & ATTR_ATIME)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800868 wstat.atime = iattr->ia_atime.tv_sec;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700869
870 if (iattr->ia_valid & ATTR_SIZE)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800871 wstat.length = iattr->ia_size;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700872
873 if (v9ses->extended) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800874 if (iattr->ia_valid & ATTR_UID)
875 wstat.n_uid = iattr->ia_uid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700876
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800877 if (iattr->ia_valid & ATTR_GID)
878 wstat.n_gid = iattr->ia_gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700879 }
880
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800881 res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700882
883 if (res < 0)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800884 PRINT_FCALL_ERROR("wstat error", fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700885
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700886 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700887 if (res >= 0)
888 res = inode_setattr(dentry->d_inode, iattr);
889
890 return res;
891}
892
893/**
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800894 * v9fs_stat2inode - populate an inode structure with mistat info
895 * @stat: Plan 9 metadata (mistat) structure
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700896 * @inode: inode to populate
897 * @sb: superblock of filesystem
898 *
899 */
900
901void
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800902v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode,
903 struct super_block *sb)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700904{
Latchesar Ionkov1dac06b2006-01-08 01:05:02 -0800905 int n;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800906 char ext[32];
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700907 struct v9fs_session_info *v9ses = sb->s_fs_info;
908
909 inode->i_nlink = 1;
910
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800911 inode->i_atime.tv_sec = stat->atime;
912 inode->i_mtime.tv_sec = stat->mtime;
913 inode->i_ctime.tv_sec = stat->mtime;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700914
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800915 inode->i_uid = v9ses->uid;
916 inode->i_gid = v9ses->gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700917
918 if (v9ses->extended) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800919 inode->i_uid = stat->n_uid;
920 inode->i_gid = stat->n_gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700921 }
922
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800923 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700924 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
925 char type = 0;
926 int major = -1;
927 int minor = -1;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800928
Latchesar Ionkov1dac06b2006-01-08 01:05:02 -0800929 n = stat->extension.len;
930 if (n > sizeof(ext)-1)
931 n = sizeof(ext)-1;
932 memmove(ext, stat->extension.str, n);
933 ext[n] = 0;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800934 sscanf(ext, "%c %u %u", &type, &major, &minor);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700935 switch (type) {
936 case 'c':
937 inode->i_mode &= ~S_IFBLK;
938 inode->i_mode |= S_IFCHR;
939 break;
940 case 'b':
941 break;
942 default:
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800943 dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n",
944 type, stat->extension.len, stat->extension.str);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700945 };
946 inode->i_rdev = MKDEV(major, minor);
947 } else
948 inode->i_rdev = 0;
949
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800950 inode->i_size = stat->length;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700951
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700952 inode->i_blocks =
Theodore Ts'oba52de12006-09-27 01:50:49 -0700953 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700954}
955
956/**
957 * v9fs_qid2ino - convert qid into inode number
958 * @qid: qid to hash
959 *
960 * BUG: potential for inode number collisions?
961 */
962
963ino_t v9fs_qid2ino(struct v9fs_qid *qid)
964{
965 u64 path = qid->path + 2;
966 ino_t i = 0;
967
968 if (sizeof(ino_t) == sizeof(path))
969 memcpy(&i, &path, sizeof(ino_t));
970 else
971 i = (ino_t) (path ^ (path >> 32));
972
973 return i;
974}
975
976/**
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700977 * v9fs_readlink - read a symlink's location (internal version)
978 * @dentry: dentry for symlink
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700979 * @buffer: buffer to load symlink location into
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700980 * @buflen: length of buffer
981 *
982 */
983
984static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
985{
986 int retval = -EPERM;
987
988 struct v9fs_fcall *fcall = NULL;
989 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700990 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700991
992 if (!fid) {
993 dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n");
994 retval = -EBADF;
995 goto FreeFcall;
996 }
997
998 if (!v9ses->extended) {
999 retval = -EBADF;
1000 dprintk(DEBUG_ERROR, "not extended\n");
1001 goto FreeFcall;
1002 }
1003
1004 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
1005 retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
1006
1007 if (retval < 0) {
1008 dprintk(DEBUG_ERROR, "stat error\n");
1009 goto FreeFcall;
1010 }
1011
1012 if (!fcall)
1013 return -EIO;
1014
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001015 if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001016 retval = -EINVAL;
1017 goto FreeFcall;
1018 }
1019
1020 /* copy extension buffer into buffer */
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001021 if (fcall->params.rstat.stat.extension.len < buflen)
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001022 buflen = fcall->params.rstat.stat.extension.len + 1;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001023
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001024 memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001025 buffer[buflen-1] = 0;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001026
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001027 dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len,
1028 fcall->params.rstat.stat.extension.str, buffer);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001029 retval = buflen;
1030
1031 FreeFcall:
1032 kfree(fcall);
1033
1034 return retval;
1035}
1036
1037/**
1038 * v9fs_vfs_readlink - read a symlink's location
1039 * @dentry: dentry for symlink
1040 * @buf: buffer to load symlink location into
1041 * @buflen: length of buffer
1042 *
1043 */
1044
1045static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
1046 int buflen)
1047{
1048 int retval;
1049 int ret;
1050 char *link = __getname();
1051
Florin Malita0710d362006-06-25 05:48:31 -07001052 if (unlikely(!link))
1053 return -ENOMEM;
1054
Latchesar Ionkova1f9d8d2005-09-22 21:43:52 -07001055 if (buflen > PATH_MAX)
1056 buflen = PATH_MAX;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001057
1058 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
1059
1060 retval = v9fs_readlink(dentry, link, buflen);
1061
1062 if (retval > 0) {
1063 if ((ret = copy_to_user(buffer, link, retval)) != 0) {
1064 dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
1065 ret);
1066 retval = ret;
1067 }
1068 }
1069
Davi Arnautce44eeb2005-11-07 00:59:36 -08001070 __putname(link);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001071 return retval;
1072}
1073
1074/**
1075 * v9fs_vfs_follow_link - follow a symlink path
1076 * @dentry: dentry for symlink
1077 * @nd: nameidata
1078 *
1079 */
1080
1081static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1082{
1083 int len = 0;
1084 char *link = __getname();
1085
1086 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
1087
1088 if (!link)
1089 link = ERR_PTR(-ENOMEM);
1090 else {
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001091 len = v9fs_readlink(dentry, link, PATH_MAX);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001092
1093 if (len < 0) {
Davi Arnautce44eeb2005-11-07 00:59:36 -08001094 __putname(link);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001095 link = ERR_PTR(len);
1096 } else
1097 link[len] = 0;
1098 }
1099 nd_set_link(nd, link);
1100
1101 return NULL;
1102}
1103
1104/**
1105 * v9fs_vfs_put_link - release a symlink path
1106 * @dentry: dentry for symlink
1107 * @nd: nameidata
1108 *
1109 */
1110
1111static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1112{
1113 char *s = nd_get_link(nd);
1114
1115 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
1116 if (!IS_ERR(s))
Davi Arnautce44eeb2005-11-07 00:59:36 -08001117 __putname(s);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001118}
1119
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001120static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1121 int mode, const char *extension)
1122{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001123 int err;
1124 u32 fid, perm;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001125 struct v9fs_session_info *v9ses;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001126 struct v9fs_fid *dfid, *vfid;
1127 struct inode *inode;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001128
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001129 inode = NULL;
1130 vfid = NULL;
1131 v9ses = v9fs_inode2v9ses(dir);
1132 dfid = v9fs_fid_lookup(dentry->d_parent);
1133 perm = unixmode2p9mode(v9ses, mode);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001134
1135 if (!v9ses->extended) {
1136 dprintk(DEBUG_ERROR, "not extended\n");
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001137 return -EPERM;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001138 }
1139
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001140 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001141 perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001142
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001143 if (err)
1144 goto error;
1145
1146 err = v9fs_t_clunk(v9ses, fid);
1147 if (err)
1148 goto error;
1149
1150 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
1151 if (IS_ERR(vfid)) {
1152 err = PTR_ERR(vfid);
1153 vfid = NULL;
1154 goto error;
1155 }
1156
1157 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
1158 if (IS_ERR(inode)) {
1159 err = PTR_ERR(inode);
1160 inode = NULL;
1161 goto error;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001162 }
1163
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001164 dentry->d_op = &v9fs_dentry_operations;
1165 d_instantiate(dentry, inode);
1166 return 0;
1167
1168error:
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001169 if (vfid)
1170 v9fs_fid_destroy(vfid);
1171
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001172 return err;
1173
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001174}
1175
1176/**
1177 * v9fs_vfs_symlink - helper function to create symlinks
1178 * @dir: directory inode containing symlink
1179 * @dentry: dentry for symlink
1180 * @symname: symlink data
1181 *
1182 * See 9P2000.u RFC for more information
1183 *
1184 */
1185
1186static int
1187v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1188{
1189 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1190 symname);
1191
1192 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1193}
1194
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001195/**
1196 * v9fs_vfs_link - create a hardlink
1197 * @old_dentry: dentry for file to link to
1198 * @dir: inode destination for new link
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001199 * @dentry: dentry for link
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001200 *
1201 */
1202
1203/* XXX - lots of code dup'd from symlink and creates,
1204 * figure out a better reuse strategy
1205 */
1206
1207static int
1208v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1209 struct dentry *dentry)
1210{
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001211 int retval;
1212 struct v9fs_fid *oldfid;
1213 char *name;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001214
1215 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1216 old_dentry->d_name.name);
1217
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001218 oldfid = v9fs_fid_lookup(old_dentry);
1219 if (!oldfid) {
1220 dprintk(DEBUG_ERROR, "can't find oldfid\n");
1221 return -EPERM;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001222 }
1223
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001224 name = __getname();
Florin Malita0710d362006-06-25 05:48:31 -07001225 if (unlikely(!name))
1226 return -ENOMEM;
1227
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001228 sprintf(name, "%d\n", oldfid->fid);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001229 retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name);
1230 __putname(name);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001231
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001232 return retval;
1233}
1234
1235/**
1236 * v9fs_vfs_mknod - create a special file
1237 * @dir: inode destination for new link
1238 * @dentry: dentry for file
1239 * @mode: mode for creation
1240 * @dev_t: device associated with special file
1241 *
1242 */
1243
1244static int
1245v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1246{
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001247 int retval;
1248 char *name;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001249
1250 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1251 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1252
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001253 if (!new_valid_dev(rdev))
1254 return -EINVAL;
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001255
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001256 name = __getname();
Eugene Teoc0291a02006-03-25 03:07:27 -08001257 if (!name)
1258 return -ENOMEM;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001259 /* build extension */
1260 if (S_ISBLK(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001261 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001262 else if (S_ISCHR(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001263 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001264 else if (S_ISFIFO(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001265 *name = 0;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001266 else {
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001267 __putname(name);
1268 return -EINVAL;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001269 }
1270
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001271 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1272 __putname(name);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001273
1274 return retval;
1275}
1276
Eric Van Hensbergenb5016112005-09-09 13:04:27 -07001277static struct inode_operations v9fs_dir_inode_operations_ext = {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001278 .create = v9fs_vfs_create,
1279 .lookup = v9fs_vfs_lookup,
1280 .symlink = v9fs_vfs_symlink,
1281 .link = v9fs_vfs_link,
1282 .unlink = v9fs_vfs_unlink,
1283 .mkdir = v9fs_vfs_mkdir,
1284 .rmdir = v9fs_vfs_rmdir,
1285 .mknod = v9fs_vfs_mknod,
1286 .rename = v9fs_vfs_rename,
1287 .readlink = v9fs_vfs_readlink,
1288 .getattr = v9fs_vfs_getattr,
1289 .setattr = v9fs_vfs_setattr,
1290};
1291
Eric Van Hensbergenb5016112005-09-09 13:04:27 -07001292static struct inode_operations v9fs_dir_inode_operations = {
1293 .create = v9fs_vfs_create,
1294 .lookup = v9fs_vfs_lookup,
1295 .unlink = v9fs_vfs_unlink,
1296 .mkdir = v9fs_vfs_mkdir,
1297 .rmdir = v9fs_vfs_rmdir,
1298 .mknod = v9fs_vfs_mknod,
1299 .rename = v9fs_vfs_rename,
1300 .getattr = v9fs_vfs_getattr,
1301 .setattr = v9fs_vfs_setattr,
1302};
1303
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001304static struct inode_operations v9fs_file_inode_operations = {
1305 .getattr = v9fs_vfs_getattr,
1306 .setattr = v9fs_vfs_setattr,
1307};
1308
1309static struct inode_operations v9fs_symlink_inode_operations = {
1310 .readlink = v9fs_vfs_readlink,
1311 .follow_link = v9fs_vfs_follow_link,
1312 .put_link = v9fs_vfs_put_link,
1313 .getattr = v9fs_vfs_getattr,
1314 .setattr = v9fs_vfs_setattr,
1315};