blob: 124a085d1f2e16265da9658cb339bbfb87e15287 [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
Arjan van de Ven754661f2007-02-12 00:55:38 -080044static const struct inode_operations v9fs_dir_inode_operations;
45static const struct inode_operations v9fs_dir_inode_operations_ext;
46static const struct inode_operations v9fs_file_inode_operations;
47static const struct inode_operations v9fs_symlink_inode_operations;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -070048
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 Hensbergenda977b22007-01-26 00:57:06 -0800419 if(IS_ERR(v9fid))
420 return PTR_ERR(v9fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700421
422 fid = v9fid->fid;
423 if (fid < 0) {
424 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
425 file_inode->i_ino);
426 return -EBADF;
427 }
428
429 result = v9fs_t_remove(v9ses, fid, &fcall);
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800430 if (result < 0) {
431 PRINT_FCALL_ERROR("remove fails", fcall);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800432 goto Error;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700433 }
434
Eric Van Hensbergen834a9b82006-07-30 03:04:16 -0700435 v9fs_put_idpool(fid, &v9ses->fidpool);
436 v9fs_fid_destroy(v9fid);
437
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800438Error:
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700439 kfree(fcall);
440 return result;
441}
442
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800443static int
444v9fs_open_created(struct inode *inode, struct file *file)
445{
446 return 0;
447}
448
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700449/**
450 * v9fs_vfs_create - VFS hook to create files
451 * @inode: directory inode that is being deleted
452 * @dentry: dentry that is being deleted
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800453 * @mode: create permissions
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700454 * @nd: path information
455 *
456 */
457
458static int
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800459v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700460 struct nameidata *nd)
461{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800462 int err;
463 u32 fid, perm, iounit;
464 int flags;
465 struct v9fs_session_info *v9ses;
466 struct v9fs_fid *dfid, *vfid, *ffid;
467 struct inode *inode;
468 struct v9fs_qid qid;
469 struct file *filp;
470
471 inode = NULL;
472 vfid = NULL;
473 v9ses = v9fs_inode2v9ses(dir);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800474 dfid = v9fs_fid_clone(dentry->d_parent);
475 if(IS_ERR(dfid)) {
476 err = PTR_ERR(dfid);
477 goto error;
478 }
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800479
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800480 perm = unixmode2p9mode(v9ses, mode);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800481 if (nd && nd->flags & LOOKUP_OPEN)
482 flags = nd->intent.open.flags - 1;
483 else
484 flags = O_RDWR;
485
486 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800487 perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800488
489 if (err)
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800490 goto clunk_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800491
492 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800493 v9fs_fid_clunk(v9ses, dfid);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800494 if (IS_ERR(vfid)) {
495 err = PTR_ERR(vfid);
496 vfid = NULL;
497 goto error;
498 }
499
500 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
501 if (IS_ERR(inode)) {
502 err = PTR_ERR(inode);
503 inode = NULL;
504 goto error;
505 }
506
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600507 if(v9ses->cache)
508 dentry->d_op = &v9fs_cached_dentry_operations;
509 else
510 dentry->d_op = &v9fs_dentry_operations;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800511 d_instantiate(dentry, inode);
512
513 if (nd && nd->flags & LOOKUP_OPEN) {
514 ffid = v9fs_fid_create(v9ses, fid);
515 if (!ffid)
516 return -ENOMEM;
517
518 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
519 if (IS_ERR(filp)) {
520 v9fs_fid_destroy(ffid);
521 return PTR_ERR(filp);
522 }
523
524 ffid->rdir_pos = 0;
525 ffid->rdir_fcall = NULL;
526 ffid->fidopen = 1;
527 ffid->iounit = iounit;
528 ffid->filp = filp;
529 filp->private_data = ffid;
530 }
531
532 return 0;
533
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800534clunk_dfid:
535 v9fs_fid_clunk(v9ses, dfid);
536
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800537error:
538 if (vfid)
539 v9fs_fid_destroy(vfid);
540
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800541 return err;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700542}
543
544/**
545 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700546 * @inode: inode that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700547 * @dentry: dentry that is being unlinked
548 * @mode: mode for new directory
549 *
550 */
551
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800552static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700553{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800554 int err;
555 u32 fid, perm;
556 struct v9fs_session_info *v9ses;
557 struct v9fs_fid *dfid, *vfid;
558 struct inode *inode;
559
560 inode = NULL;
561 vfid = NULL;
562 v9ses = v9fs_inode2v9ses(dir);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800563 dfid = v9fs_fid_clone(dentry->d_parent);
564 if(IS_ERR(dfid)) {
565 err = PTR_ERR(dfid);
566 goto error;
567 }
568
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800569 perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
570
571 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -0800572 perm, V9FS_OREAD, NULL, &fid, NULL, NULL);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800573
574 if (err) {
575 dprintk(DEBUG_ERROR, "create error %d\n", err);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800576 goto clean_up_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800577 }
578
579 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
580 if (IS_ERR(vfid)) {
581 err = PTR_ERR(vfid);
582 vfid = NULL;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800583 goto clean_up_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800584 }
585
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800586 v9fs_fid_clunk(v9ses, dfid);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800587 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
588 if (IS_ERR(inode)) {
589 err = PTR_ERR(inode);
590 inode = NULL;
Adrian Bunk835d90c2007-02-08 14:20:38 -0800591 v9fs_fid_destroy(vfid);
592 goto error;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800593 }
594
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600595 if(v9ses->cache)
596 dentry->d_op = &v9fs_cached_dentry_operations;
597 else
598 dentry->d_op = &v9fs_dentry_operations;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800599 d_instantiate(dentry, inode);
600 return 0;
601
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800602clean_up_dfid:
603 v9fs_fid_clunk(v9ses, dfid);
604
605error:
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800606 return err;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700607}
608
609/**
610 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
611 * @dir: inode that is being walked from
612 * @dentry: dentry that is being walked to?
613 * @nameidata: path data
614 *
615 */
616
617static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
618 struct nameidata *nameidata)
619{
620 struct super_block *sb;
621 struct v9fs_session_info *v9ses;
622 struct v9fs_fid *dirfid;
623 struct v9fs_fid *fid;
624 struct inode *inode;
625 struct v9fs_fcall *fcall = NULL;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700626 int dirfidnum = -1;
627 int newfid = -1;
628 int result = 0;
629
630 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
Latchesar Ionkov731805b2006-03-07 21:55:42 -0800631 dir, dentry->d_name.name, dentry, nameidata);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700632
633 sb = dir->i_sb;
634 v9ses = v9fs_inode2v9ses(dir);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700635 dirfid = v9fs_fid_lookup(dentry->d_parent);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700636
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800637 if(IS_ERR(dirfid))
638 return ERR_PTR(PTR_ERR(dirfid));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700639
640 dirfidnum = dirfid->fid;
641
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700642 newfid = v9fs_get_idpool(&v9ses->fidpool);
643 if (newfid < 0) {
644 eprintk(KERN_WARNING, "newfid fails!\n");
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800645 result = -ENOSPC;
646 goto Release_Dirfid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700647 }
648
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800649 result = v9fs_t_walk(v9ses, dirfidnum, newfid,
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700650 (char *)dentry->d_name.name, &fcall);
651
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800652 up(&dirfid->lock);
653
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700654 if (result < 0) {
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700655 if (fcall && fcall->id == RWALK)
656 v9fs_t_clunk(v9ses, newfid);
657 else
658 v9fs_put_idpool(newfid, &v9ses->fidpool);
659
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700660 if (result == -ENOENT) {
661 d_add(dentry, NULL);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700662 dprintk(DEBUG_VFS,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700663 "Return negative dentry %p count %d\n",
664 dentry, atomic_read(&dentry->d_count));
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700665 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700666 return NULL;
667 }
668 dprintk(DEBUG_ERROR, "walk error:%d\n", result);
669 goto FreeFcall;
670 }
Latchesar Ionkov41e5a6a2006-05-15 09:44:21 -0700671 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700672
673 result = v9fs_t_stat(v9ses, newfid, &fcall);
674 if (result < 0) {
675 dprintk(DEBUG_ERROR, "stat error\n");
676 goto FreeFcall;
677 }
678
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800679 inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses,
680 fcall->params.rstat.stat.mode));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700681
682 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
683 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
684 PTR_ERR(inode));
685
686 result = -ENOSPC;
687 goto FreeFcall;
688 }
689
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800690 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700691
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800692 fid = v9fs_fid_create(v9ses, newfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700693 if (fid == NULL) {
694 dprintk(DEBUG_ERROR, "couldn't insert\n");
695 result = -ENOMEM;
696 goto FreeFcall;
697 }
698
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -0800699 result = v9fs_fid_insert(fid, dentry);
700 if (result < 0)
701 goto FreeFcall;
702
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800703 fid->qid = fcall->params.rstat.stat.qid;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800704 v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb);
Eric Van Hensbergene03abc02007-02-11 13:21:39 -0600705 if((fid->qid.version)&&(v9ses->cache))
706 dentry->d_op = &v9fs_cached_dentry_operations;
707 else
708 dentry->d_op = &v9fs_dentry_operations;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700709
710 d_add(dentry, inode);
711 kfree(fcall);
712
713 return NULL;
714
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800715Release_Dirfid:
716 up(&dirfid->lock);
717
718FreeFcall:
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700719 kfree(fcall);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800720
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700721 return ERR_PTR(result);
722}
723
724/**
725 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
726 * @i: inode that is being unlinked
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700727 * @d: dentry that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700728 *
729 */
730
731static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
732{
733 return v9fs_remove(i, d, 0);
734}
735
736/**
737 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
738 * @i: inode that is being unlinked
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -0700739 * @d: dentry that is being unlinked
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700740 *
741 */
742
743static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
744{
745 return v9fs_remove(i, d, 1);
746}
747
748/**
749 * v9fs_vfs_rename - VFS hook to rename an inode
750 * @old_dir: old dir inode
751 * @old_dentry: old dentry
752 * @new_dir: new dir inode
753 * @new_dentry: new dentry
754 *
755 */
756
757static int
758v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
759 struct inode *new_dir, struct dentry *new_dentry)
760{
761 struct inode *old_inode = old_dentry->d_inode;
762 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
Latchesar Ionkov0b8dd172005-09-27 21:45:24 -0700763 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800764 struct v9fs_fid *olddirfid;
765 struct v9fs_fid *newdirfid;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800766 struct v9fs_wstat wstat;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700767 struct v9fs_fcall *fcall = NULL;
768 int fid = -1;
769 int olddirfidnum = -1;
770 int newdirfidnum = -1;
771 int retval = 0;
772
773 dprintk(DEBUG_VFS, "\n");
774
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800775 if(IS_ERR(oldfid))
776 return PTR_ERR(oldfid);
777
778 olddirfid = v9fs_fid_clone(old_dentry->d_parent);
779 if(IS_ERR(olddirfid)) {
780 retval = PTR_ERR(olddirfid);
781 goto Release_lock;
782 }
783
784 newdirfid = v9fs_fid_clone(new_dentry->d_parent);
785 if(IS_ERR(newdirfid)) {
786 retval = PTR_ERR(newdirfid);
787 goto Clunk_olddir;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700788 }
789
790 /* 9P can only handle file rename in the same directory */
791 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
792 dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
Eric Van Hensbergen621997c2007-01-26 00:57:04 -0800793 retval = -EXDEV;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800794 goto Clunk_newdir;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700795 }
796
797 fid = oldfid->fid;
798 olddirfidnum = olddirfid->fid;
799 newdirfidnum = newdirfid->fid;
800
801 if (fid < 0) {
802 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
803 old_inode->i_ino);
804 retval = -EBADF;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800805 goto Clunk_newdir;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700806 }
807
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800808 v9fs_blank_wstat(&wstat);
809 wstat.muid = v9ses->name;
810 wstat.name = (char *) new_dentry->d_name.name;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700811
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800812 retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700813
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700814 if (retval < 0)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800815 PRINT_FCALL_ERROR("wstat error", fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700816
817 kfree(fcall);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800818
819Clunk_newdir:
820 v9fs_fid_clunk(v9ses, newdirfid);
821
822Clunk_olddir:
823 v9fs_fid_clunk(v9ses, olddirfid);
824
825Release_lock:
826 up(&oldfid->lock);
827
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700828 return retval;
829}
830
831/**
Adrian Bunk943ffb52006-01-10 00:10:13 +0100832 * v9fs_vfs_getattr - retrieve file metadata
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700833 * @mnt - mount information
834 * @dentry - file to get attributes on
835 * @stat - metadata structure to populate
836 *
837 */
838
839static int
840v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
841 struct kstat *stat)
842{
843 struct v9fs_fcall *fcall = NULL;
844 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800845 struct v9fs_fid *fid = v9fs_fid_clone(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700846 int err = -EPERM;
847
848 dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800849 if(IS_ERR(fid))
850 return PTR_ERR(fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700851
852 err = v9fs_t_stat(v9ses, fid->fid, &fcall);
853
854 if (err < 0)
855 dprintk(DEBUG_ERROR, "stat error\n");
856 else {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800857 v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode,
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700858 dentry->d_inode->i_sb);
859 generic_fillattr(dentry->d_inode, stat);
860 }
861
862 kfree(fcall);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800863 v9fs_fid_clunk(v9ses, fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700864 return err;
865}
866
867/**
868 * v9fs_vfs_setattr - set file metadata
869 * @dentry: file whose metadata to set
870 * @iattr: metadata assignment structure
871 *
872 */
873
874static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
875{
876 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800877 struct v9fs_fid *fid = v9fs_fid_clone(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700878 struct v9fs_fcall *fcall = NULL;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800879 struct v9fs_wstat wstat;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700880 int res = -EPERM;
881
882 dprintk(DEBUG_VFS, "\n");
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800883 if(IS_ERR(fid))
884 return PTR_ERR(fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700885
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800886 v9fs_blank_wstat(&wstat);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700887 if (iattr->ia_valid & ATTR_MODE)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800888 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700889
890 if (iattr->ia_valid & ATTR_MTIME)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800891 wstat.mtime = iattr->ia_mtime.tv_sec;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700892
893 if (iattr->ia_valid & ATTR_ATIME)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800894 wstat.atime = iattr->ia_atime.tv_sec;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700895
896 if (iattr->ia_valid & ATTR_SIZE)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800897 wstat.length = iattr->ia_size;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700898
899 if (v9ses->extended) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800900 if (iattr->ia_valid & ATTR_UID)
901 wstat.n_uid = iattr->ia_uid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700902
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800903 if (iattr->ia_valid & ATTR_GID)
904 wstat.n_gid = iattr->ia_gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700905 }
906
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800907 res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700908
909 if (res < 0)
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800910 PRINT_FCALL_ERROR("wstat error", fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700911
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700912 kfree(fcall);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700913 if (res >= 0)
914 res = inode_setattr(dentry->d_inode, iattr);
915
Eric Van Hensbergenda977b22007-01-26 00:57:06 -0800916 v9fs_fid_clunk(v9ses, fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700917 return res;
918}
919
920/**
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800921 * v9fs_stat2inode - populate an inode structure with mistat info
922 * @stat: Plan 9 metadata (mistat) structure
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700923 * @inode: inode to populate
924 * @sb: superblock of filesystem
925 *
926 */
927
928void
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800929v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode,
930 struct super_block *sb)
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700931{
Latchesar Ionkov1dac06b2006-01-08 01:05:02 -0800932 int n;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800933 char ext[32];
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700934 struct v9fs_session_info *v9ses = sb->s_fs_info;
935
936 inode->i_nlink = 1;
937
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800938 inode->i_atime.tv_sec = stat->atime;
939 inode->i_mtime.tv_sec = stat->mtime;
940 inode->i_ctime.tv_sec = stat->mtime;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700941
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800942 inode->i_uid = v9ses->uid;
943 inode->i_gid = v9ses->gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700944
945 if (v9ses->extended) {
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800946 inode->i_uid = stat->n_uid;
947 inode->i_gid = stat->n_gid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700948 }
949
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800950 inode->i_mode = p9mode2unixmode(v9ses, stat->mode);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700951 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
952 char type = 0;
953 int major = -1;
954 int minor = -1;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800955
Latchesar Ionkov1dac06b2006-01-08 01:05:02 -0800956 n = stat->extension.len;
957 if (n > sizeof(ext)-1)
958 n = sizeof(ext)-1;
959 memmove(ext, stat->extension.str, n);
960 ext[n] = 0;
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800961 sscanf(ext, "%c %u %u", &type, &major, &minor);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700962 switch (type) {
963 case 'c':
964 inode->i_mode &= ~S_IFBLK;
965 inode->i_mode |= S_IFCHR;
966 break;
967 case 'b':
968 break;
969 default:
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800970 dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n",
971 type, stat->extension.len, stat->extension.str);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700972 };
973 inode->i_rdev = MKDEV(major, minor);
974 } else
975 inode->i_rdev = 0;
976
Latchesar Ionkov531b1092006-01-08 01:05:00 -0800977 inode->i_size = stat->length;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700978
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700979 inode->i_blocks =
Theodore Ts'oba52de12006-09-27 01:50:49 -0700980 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -0700981}
982
983/**
984 * v9fs_qid2ino - convert qid into inode number
985 * @qid: qid to hash
986 *
987 * BUG: potential for inode number collisions?
988 */
989
990ino_t v9fs_qid2ino(struct v9fs_qid *qid)
991{
992 u64 path = qid->path + 2;
993 ino_t i = 0;
994
995 if (sizeof(ino_t) == sizeof(path))
996 memcpy(&i, &path, sizeof(ino_t));
997 else
998 i = (ino_t) (path ^ (path >> 32));
999
1000 return i;
1001}
1002
1003/**
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001004 * v9fs_readlink - read a symlink's location (internal version)
1005 * @dentry: dentry for symlink
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001006 * @buffer: buffer to load symlink location into
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001007 * @buflen: length of buffer
1008 *
1009 */
1010
1011static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1012{
1013 int retval = -EPERM;
1014
1015 struct v9fs_fcall *fcall = NULL;
1016 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001017 struct v9fs_fid *fid = v9fs_fid_clone(dentry);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001018
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001019 if(IS_ERR(fid))
1020 return PTR_ERR(fid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001021
1022 if (!v9ses->extended) {
1023 retval = -EBADF;
1024 dprintk(DEBUG_ERROR, "not extended\n");
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001025 goto ClunkFid;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001026 }
1027
1028 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
1029 retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
1030
1031 if (retval < 0) {
1032 dprintk(DEBUG_ERROR, "stat error\n");
1033 goto FreeFcall;
1034 }
1035
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001036 if (!fcall) {
1037 retval = -EIO;
1038 goto ClunkFid;
1039 }
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001040
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001041 if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001042 retval = -EINVAL;
1043 goto FreeFcall;
1044 }
1045
1046 /* copy extension buffer into buffer */
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001047 if (fcall->params.rstat.stat.extension.len < buflen)
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001048 buflen = fcall->params.rstat.stat.extension.len + 1;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001049
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001050 memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001051 buffer[buflen-1] = 0;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001052
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001053 dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len,
1054 fcall->params.rstat.stat.extension.str, buffer);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001055 retval = buflen;
1056
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001057FreeFcall:
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001058 kfree(fcall);
1059
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001060ClunkFid:
1061 v9fs_fid_clunk(v9ses, fid);
1062
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001063 return retval;
1064}
1065
1066/**
1067 * v9fs_vfs_readlink - read a symlink's location
1068 * @dentry: dentry for symlink
1069 * @buf: buffer to load symlink location into
1070 * @buflen: length of buffer
1071 *
1072 */
1073
1074static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
1075 int buflen)
1076{
1077 int retval;
1078 int ret;
1079 char *link = __getname();
1080
Florin Malita0710d362006-06-25 05:48:31 -07001081 if (unlikely(!link))
1082 return -ENOMEM;
1083
Latchesar Ionkova1f9d8d2005-09-22 21:43:52 -07001084 if (buflen > PATH_MAX)
1085 buflen = PATH_MAX;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001086
1087 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
1088
1089 retval = v9fs_readlink(dentry, link, buflen);
1090
1091 if (retval > 0) {
1092 if ((ret = copy_to_user(buffer, link, retval)) != 0) {
1093 dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
1094 ret);
1095 retval = ret;
1096 }
1097 }
1098
Davi Arnautce44eeb2005-11-07 00:59:36 -08001099 __putname(link);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001100 return retval;
1101}
1102
1103/**
1104 * v9fs_vfs_follow_link - follow a symlink path
1105 * @dentry: dentry for symlink
1106 * @nd: nameidata
1107 *
1108 */
1109
1110static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1111{
1112 int len = 0;
1113 char *link = __getname();
1114
1115 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
1116
1117 if (!link)
1118 link = ERR_PTR(-ENOMEM);
1119 else {
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001120 len = v9fs_readlink(dentry, link, PATH_MAX);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001121
1122 if (len < 0) {
Davi Arnautce44eeb2005-11-07 00:59:36 -08001123 __putname(link);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001124 link = ERR_PTR(len);
1125 } else
1126 link[len] = 0;
1127 }
1128 nd_set_link(nd, link);
1129
1130 return NULL;
1131}
1132
1133/**
1134 * v9fs_vfs_put_link - release a symlink path
1135 * @dentry: dentry for symlink
1136 * @nd: nameidata
1137 *
1138 */
1139
1140static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1141{
1142 char *s = nd_get_link(nd);
1143
1144 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
1145 if (!IS_ERR(s))
Davi Arnautce44eeb2005-11-07 00:59:36 -08001146 __putname(s);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001147}
1148
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001149static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
1150 int mode, const char *extension)
1151{
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001152 int err;
1153 u32 fid, perm;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001154 struct v9fs_session_info *v9ses;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001155 struct v9fs_fid *dfid, *vfid = NULL;
1156 struct inode *inode = NULL;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001157
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001158 v9ses = v9fs_inode2v9ses(dir);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001159 if (!v9ses->extended) {
1160 dprintk(DEBUG_ERROR, "not extended\n");
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001161 return -EPERM;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001162 }
1163
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001164 dfid = v9fs_fid_clone(dentry->d_parent);
1165 if(IS_ERR(dfid)) {
1166 err = PTR_ERR(dfid);
1167 goto error;
1168 }
1169
1170 perm = unixmode2p9mode(v9ses, mode);
1171
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001172 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001173 perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001174
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001175 if (err)
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001176 goto clunk_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001177
1178 err = v9fs_t_clunk(v9ses, fid);
1179 if (err)
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001180 goto clunk_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001181
1182 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
1183 if (IS_ERR(vfid)) {
1184 err = PTR_ERR(vfid);
1185 vfid = NULL;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001186 goto clunk_dfid;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001187 }
1188
1189 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
1190 if (IS_ERR(inode)) {
1191 err = PTR_ERR(inode);
1192 inode = NULL;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001193 goto free_vfid;
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001194 }
1195
Eric Van Hensbergene03abc02007-02-11 13:21:39 -06001196 if(v9ses->cache)
1197 dentry->d_op = &v9fs_cached_dentry_operations;
1198 else
1199 dentry->d_op = &v9fs_dentry_operations;
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001200 d_instantiate(dentry, inode);
1201 return 0;
1202
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001203free_vfid:
1204 v9fs_fid_destroy(vfid);
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001205
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001206clunk_dfid:
1207 v9fs_fid_clunk(v9ses, dfid);
1208
1209error:
Latchesar Ionkov6a3124a2006-03-02 02:54:30 -08001210 return err;
1211
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001212}
1213
1214/**
1215 * v9fs_vfs_symlink - helper function to create symlinks
1216 * @dir: directory inode containing symlink
1217 * @dentry: dentry for symlink
1218 * @symname: symlink data
1219 *
1220 * See 9P2000.u RFC for more information
1221 *
1222 */
1223
1224static int
1225v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
1226{
1227 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1228 symname);
1229
1230 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname);
1231}
1232
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001233/**
1234 * v9fs_vfs_link - create a hardlink
1235 * @old_dentry: dentry for file to link to
1236 * @dir: inode destination for new link
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001237 * @dentry: dentry for link
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001238 *
1239 */
1240
1241/* XXX - lots of code dup'd from symlink and creates,
1242 * figure out a better reuse strategy
1243 */
1244
1245static int
1246v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1247 struct dentry *dentry)
1248{
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001249 int retval;
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001250 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001251 struct v9fs_fid *oldfid;
1252 char *name;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001253
1254 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1255 old_dentry->d_name.name);
1256
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001257 oldfid = v9fs_fid_clone(old_dentry);
1258 if(IS_ERR(oldfid))
1259 return PTR_ERR(oldfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001260
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001261 name = __getname();
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001262 if (unlikely(!name)) {
1263 retval = -ENOMEM;
1264 goto clunk_fid;
1265 }
Florin Malita0710d362006-06-25 05:48:31 -07001266
Latchesar Ionkov16cce6d2006-03-25 03:07:26 -08001267 sprintf(name, "%d\n", oldfid->fid);
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001268 retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name);
1269 __putname(name);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001270
Eric Van Hensbergenda977b22007-01-26 00:57:06 -08001271clunk_fid:
1272 v9fs_fid_clunk(v9ses, oldfid);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001273 return retval;
1274}
1275
1276/**
1277 * v9fs_vfs_mknod - create a special file
1278 * @dir: inode destination for new link
1279 * @dentry: dentry for file
1280 * @mode: mode for creation
1281 * @dev_t: device associated with special file
1282 *
1283 */
1284
1285static int
1286v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1287{
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001288 int retval;
1289 char *name;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001290
1291 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1292 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1293
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001294 if (!new_valid_dev(rdev))
1295 return -EINVAL;
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001296
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001297 name = __getname();
Eugene Teoc0291a02006-03-25 03:07:27 -08001298 if (!name)
1299 return -ENOMEM;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001300 /* build extension */
1301 if (S_ISBLK(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001302 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001303 else if (S_ISCHR(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001304 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
Eric Van Hensbergen73c592b2005-09-09 13:04:26 -07001305 else if (S_ISFIFO(mode))
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001306 *name = 0;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001307 else {
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001308 __putname(name);
1309 return -EINVAL;
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001310 }
1311
Latchesar Ionkov531b1092006-01-08 01:05:00 -08001312 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name);
1313 __putname(name);
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001314
1315 return retval;
1316}
1317
Arjan van de Ven754661f2007-02-12 00:55:38 -08001318static const struct inode_operations v9fs_dir_inode_operations_ext = {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001319 .create = v9fs_vfs_create,
1320 .lookup = v9fs_vfs_lookup,
1321 .symlink = v9fs_vfs_symlink,
1322 .link = v9fs_vfs_link,
1323 .unlink = v9fs_vfs_unlink,
1324 .mkdir = v9fs_vfs_mkdir,
1325 .rmdir = v9fs_vfs_rmdir,
1326 .mknod = v9fs_vfs_mknod,
1327 .rename = v9fs_vfs_rename,
1328 .readlink = v9fs_vfs_readlink,
1329 .getattr = v9fs_vfs_getattr,
1330 .setattr = v9fs_vfs_setattr,
1331};
1332
Arjan van de Ven754661f2007-02-12 00:55:38 -08001333static const struct inode_operations v9fs_dir_inode_operations = {
Eric Van Hensbergenb5016112005-09-09 13:04:27 -07001334 .create = v9fs_vfs_create,
1335 .lookup = v9fs_vfs_lookup,
1336 .unlink = v9fs_vfs_unlink,
1337 .mkdir = v9fs_vfs_mkdir,
1338 .rmdir = v9fs_vfs_rmdir,
1339 .mknod = v9fs_vfs_mknod,
1340 .rename = v9fs_vfs_rename,
1341 .getattr = v9fs_vfs_getattr,
1342 .setattr = v9fs_vfs_setattr,
1343};
1344
Arjan van de Ven754661f2007-02-12 00:55:38 -08001345static const struct inode_operations v9fs_file_inode_operations = {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001346 .getattr = v9fs_vfs_getattr,
1347 .setattr = v9fs_vfs_setattr,
1348};
1349
Arjan van de Ven754661f2007-02-12 00:55:38 -08001350static const struct inode_operations v9fs_symlink_inode_operations = {
Eric Van Hensbergen2bad8472005-09-09 13:04:19 -07001351 .readlink = v9fs_vfs_readlink,
1352 .follow_link = v9fs_vfs_follow_link,
1353 .put_link = v9fs_vfs_put_link,
1354 .getattr = v9fs_vfs_getattr,
1355 .setattr = v9fs_vfs_setattr,
1356};