Merge master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / fs / 9p / vfs_inode.c
1 /*
2  *  linux/fs/9p/vfs_inode.c
3  *
4  * This file contains vfs inode ops for the 9P2000 protocol.
5  *
6  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11  *  the Free Software Foundation; either version 2 of the License, or
12  *  (at your option) any later version.
13  *
14  *  This program is distributed in the hope that it will be useful,
15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  *  GNU General Public License for more details.
18  *
19  *  You should have received a copy of the GNU General Public License
20  *  along with this program; if not, write to:
21  *  Free Software Foundation
22  *  51 Franklin Street, Fifth Floor
23  *  Boston, MA  02111-1301  USA
24  *
25  */
26
27 #include <linux/module.h>
28 #include <linux/errno.h>
29 #include <linux/fs.h>
30 #include <linux/file.h>
31 #include <linux/pagemap.h>
32 #include <linux/stat.h>
33 #include <linux/string.h>
34 #include <linux/smp_lock.h>
35 #include <linux/inet.h>
36 #include <linux/namei.h>
37 #include <linux/idr.h>
38
39 #include "debug.h"
40 #include "v9fs.h"
41 #include "9p.h"
42 #include "v9fs_vfs.h"
43 #include "conv.h"
44 #include "fid.h"
45
46 static struct inode_operations v9fs_dir_inode_operations;
47 static struct inode_operations v9fs_dir_inode_operations_ext;
48 static struct inode_operations v9fs_file_inode_operations;
49 static struct inode_operations v9fs_symlink_inode_operations;
50
51 /**
52  * unixmode2p9mode - convert unix mode bits to plan 9
53  * @v9ses: v9fs session information
54  * @mode: mode to convert
55  *
56  */
57
58 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
59 {
60         int res;
61         res = mode & 0777;
62         if (S_ISDIR(mode))
63                 res |= V9FS_DMDIR;
64         if (v9ses->extended) {
65                 if (S_ISLNK(mode))
66                         res |= V9FS_DMSYMLINK;
67                 if (v9ses->nodev == 0) {
68                         if (S_ISSOCK(mode))
69                                 res |= V9FS_DMSOCKET;
70                         if (S_ISFIFO(mode))
71                                 res |= V9FS_DMNAMEDPIPE;
72                         if (S_ISBLK(mode))
73                                 res |= V9FS_DMDEVICE;
74                         if (S_ISCHR(mode))
75                                 res |= V9FS_DMDEVICE;
76                 }
77
78                 if ((mode & S_ISUID) == S_ISUID)
79                         res |= V9FS_DMSETUID;
80                 if ((mode & S_ISGID) == S_ISGID)
81                         res |= V9FS_DMSETGID;
82                 if ((mode & V9FS_DMLINK))
83                         res |= V9FS_DMLINK;
84         }
85
86         return res;
87 }
88
89 /**
90  * p9mode2unixmode- convert plan9 mode bits to unix mode bits
91  * @v9ses: v9fs session information
92  * @mode: mode to convert
93  *
94  */
95
96 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
97 {
98         int res;
99
100         res = mode & 0777;
101
102         if ((mode & V9FS_DMDIR) == V9FS_DMDIR)
103                 res |= S_IFDIR;
104         else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
105                 res |= S_IFLNK;
106         else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
107                  && (v9ses->nodev == 0))
108                 res |= S_IFSOCK;
109         else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
110                  && (v9ses->nodev == 0))
111                 res |= S_IFIFO;
112         else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
113                  && (v9ses->nodev == 0))
114                 res |= S_IFBLK;
115         else
116                 res |= S_IFREG;
117
118         if (v9ses->extended) {
119                 if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
120                         res |= S_ISUID;
121
122                 if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
123                         res |= S_ISGID;
124         }
125
126         return res;
127 }
128
129 /**
130  * v9fs_blank_mistat - helper function to setup a 9P stat structure
131  * @v9ses: 9P session info (for determining extended mode)
132  * @mistat: structure to initialize
133  *
134  */
135
136 static void
137 v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat)
138 {
139         mistat->type = ~0;
140         mistat->dev = ~0;
141         mistat->qid.type = ~0;
142         mistat->qid.version = ~0;
143         *((long long *)&mistat->qid.path) = ~0;
144         mistat->mode = ~0;
145         mistat->atime = ~0;
146         mistat->mtime = ~0;
147         mistat->length = ~0;
148         mistat->name = mistat->data;
149         mistat->uid = mistat->data;
150         mistat->gid = mistat->data;
151         mistat->muid = mistat->data;
152         if (v9ses->extended) {
153                 mistat->n_uid = ~0;
154                 mistat->n_gid = ~0;
155                 mistat->n_muid = ~0;
156                 mistat->extension = mistat->data;
157         }
158         *mistat->data = 0;
159 }
160
161 /**
162  * v9fs_mistat2unix - convert mistat to unix stat
163  * @mistat: Plan 9 metadata (mistat) structure
164  * @buf: unix metadata (stat) structure to populate
165  * @sb: superblock
166  *
167  */
168
169 static void
170 v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf,
171                  struct super_block *sb)
172 {
173         struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL;
174
175         buf->st_nlink = 1;
176
177         buf->st_atime = mistat->atime;
178         buf->st_mtime = mistat->mtime;
179         buf->st_ctime = mistat->mtime;
180
181         buf->st_uid = (unsigned short)-1;
182         buf->st_gid = (unsigned short)-1;
183
184         if (v9ses && v9ses->extended) {
185                 /* TODO: string to uid mapping via user-space daemon */
186                 if (mistat->n_uid != -1)
187                         sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid);
188
189                 if (mistat->n_gid != -1)
190                         sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid);
191         }
192
193         if (buf->st_uid == (unsigned short)-1)
194                 buf->st_uid = v9ses->uid;
195         if (buf->st_gid == (unsigned short)-1)
196                 buf->st_gid = v9ses->gid;
197
198         buf->st_mode = p9mode2unixmode(v9ses, mistat->mode);
199         if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) {
200                 char type = 0;
201                 int major = -1;
202                 int minor = -1;
203                 sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
204                 switch (type) {
205                 case 'c':
206                         buf->st_mode &= ~S_IFBLK;
207                         buf->st_mode |= S_IFCHR;
208                         break;
209                 case 'b':
210                         break;
211                 default:
212                         dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
213                                 type, mistat->extension);
214                 };
215                 buf->st_rdev = MKDEV(major, minor);
216         } else
217                 buf->st_rdev = 0;
218
219         buf->st_size = mistat->length;
220
221         buf->st_blksize = sb->s_blocksize;
222         buf->st_blocks =
223             (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits;
224 }
225
226 /**
227  * v9fs_get_inode - helper function to setup an inode
228  * @sb: superblock
229  * @mode: mode to setup inode with
230  *
231  */
232
233 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
234 {
235         struct inode *inode = NULL;
236         struct v9fs_session_info *v9ses = sb->s_fs_info;
237
238         dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
239
240         inode = new_inode(sb);
241         if (inode) {
242                 inode->i_mode = mode;
243                 inode->i_uid = current->fsuid;
244                 inode->i_gid = current->fsgid;
245                 inode->i_blksize = sb->s_blocksize;
246                 inode->i_blocks = 0;
247                 inode->i_rdev = 0;
248                 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
249
250                 switch (mode & S_IFMT) {
251                 case S_IFIFO:
252                 case S_IFBLK:
253                 case S_IFCHR:
254                 case S_IFSOCK:
255                         if(!v9ses->extended) {
256                                 dprintk(DEBUG_ERROR, "special files without extended mode\n");
257                                 return ERR_PTR(-EINVAL);
258                         }
259                         init_special_inode(inode, inode->i_mode,
260                                            inode->i_rdev);
261                         break;
262                 case S_IFREG:
263                         inode->i_op = &v9fs_file_inode_operations;
264                         inode->i_fop = &v9fs_file_operations;
265                         break;
266                 case S_IFLNK:
267                         if(!v9ses->extended) {
268                                 dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n");
269                                 return ERR_PTR(-EINVAL);
270                         }
271                         inode->i_op = &v9fs_symlink_inode_operations;
272                         break;
273                 case S_IFDIR:
274                         inode->i_nlink++;
275                         if(v9ses->extended)
276                                 inode->i_op = &v9fs_dir_inode_operations_ext;
277                         else
278                                 inode->i_op = &v9fs_dir_inode_operations;
279                         inode->i_fop = &v9fs_dir_operations;
280                         break;
281                 default:
282                         dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
283                                 mode, mode & S_IFMT);
284                         return ERR_PTR(-EINVAL);
285                 }
286         } else {
287                 eprintk(KERN_WARNING, "Problem allocating inode\n");
288                 return ERR_PTR(-ENOMEM);
289         }
290         return inode;
291 }
292
293 /**
294  * v9fs_create - helper function to create files and directories
295  * @dir: directory inode file is being created in
296  * @file_dentry: dentry file is being created in
297  * @perm: permissions file is being created with
298  * @open_mode: resulting open mode for file
299  *
300  */
301
302 static int
303 v9fs_create(struct inode *dir,
304             struct dentry *file_dentry,
305             unsigned int perm, unsigned int open_mode)
306 {
307         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
308         struct super_block *sb = dir->i_sb;
309         struct v9fs_fid *dirfid =
310             v9fs_fid_lookup(file_dentry->d_parent);
311         struct v9fs_fid *fid = NULL;
312         struct inode *file_inode = NULL;
313         struct v9fs_fcall *fcall = NULL;
314         struct v9fs_qid qid;
315         struct stat newstat;
316         int dirfidnum = -1;
317         long newfid = -1;
318         int result = 0;
319         unsigned int iounit = 0;
320         int wfidno = -1;
321
322         perm = unixmode2p9mode(v9ses, perm);
323
324         dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir,
325                 file_dentry, perm, open_mode);
326
327         if (!dirfid)
328                 return -EBADF;
329
330         dirfidnum = dirfid->fid;
331         if (dirfidnum < 0) {
332                 dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n",
333                         dir->i_ino);
334                 return -EBADF;
335         }
336
337         if (file_dentry->d_inode) {
338                 dprintk(DEBUG_ERROR,
339                         "Odd. There is an inode for dir %lu, name :%s:\n",
340                         dir->i_ino, file_dentry->d_name.name);
341                 return -EEXIST;
342         }
343
344         newfid = v9fs_get_idpool(&v9ses->fidpool);
345         if (newfid < 0) {
346                 eprintk(KERN_WARNING, "no free fids available\n");
347                 return -ENOSPC;
348         }
349
350         result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall);
351         if (result < 0) {
352                 dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
353                 v9fs_put_idpool(newfid, &v9ses->fidpool);
354                 newfid = -1;
355                 goto CleanUpFid;
356         }
357
358         kfree(fcall);
359
360         result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name,
361                                perm, open_mode, &fcall);
362         if (result < 0) {
363                 dprintk(DEBUG_ERROR, "create fails: %s(%d)\n",
364                         FCALL_ERROR(fcall), result);
365
366                 goto CleanUpFid;
367         }
368
369         iounit = fcall->params.rcreate.iounit;
370         qid = fcall->params.rcreate.qid;
371         kfree(fcall);
372
373         fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1);
374         dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate);
375         if (!fid) {
376                 result = -ENOMEM;
377                 goto CleanUpFid;
378         }
379
380         fid->qid = qid;
381         fid->iounit = iounit;
382
383         /* walk to the newly created file and put the fid in the dentry */
384         wfidno = v9fs_get_idpool(&v9ses->fidpool);
385         if (newfid < 0) {
386                 eprintk(KERN_WARNING, "no free fids available\n");
387                 return -ENOSPC;
388         }
389
390         result = v9fs_t_walk(v9ses, dirfidnum, wfidno,
391                 (char *) file_dentry->d_name.name, NULL);
392         if (result < 0) {
393                 dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
394                 v9fs_put_idpool(wfidno, &v9ses->fidpool);
395                 wfidno = -1;
396                 goto CleanUpFid;
397         }
398
399         if (!v9fs_fid_create(file_dentry, v9ses, wfidno, 0)) {
400                 if (!v9fs_t_clunk(v9ses, newfid, &fcall)) {
401                         v9fs_put_idpool(wfidno, &v9ses->fidpool);
402                 }
403
404                 goto CleanUpFid;
405         }
406
407         if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) ||
408             (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) ||
409             (perm & V9FS_DMDEVICE))
410                 return 0;
411
412         result = v9fs_t_stat(v9ses, newfid, &fcall);
413         if (result < 0) {
414                 dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall),
415                         result);
416                 goto CleanUpFid;
417         }
418
419         v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
420
421         file_inode = v9fs_get_inode(sb, newstat.st_mode);
422         if ((!file_inode) || IS_ERR(file_inode)) {
423                 dprintk(DEBUG_ERROR, "create inode failed\n");
424                 result = -EBADF;
425                 goto CleanUpFid;
426         }
427
428         v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb);
429         kfree(fcall);
430         fcall = NULL;
431         file_dentry->d_op = &v9fs_dentry_operations;
432         d_instantiate(file_dentry, file_inode);
433
434         if (perm & V9FS_DMDIR) {
435                 if (!v9fs_t_clunk(v9ses, newfid, &fcall))
436                         v9fs_put_idpool(newfid, &v9ses->fidpool);
437                 else
438                         dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n",
439                                 FCALL_ERROR(fcall));
440                 kfree(fcall);
441                 fid->fidopen = 0;
442                 fid->fidcreate = 0;
443                 d_drop(file_dentry);
444         }
445
446         return 0;
447
448       CleanUpFid:
449         kfree(fcall);
450
451         if (newfid >= 0) {
452                 if (!v9fs_t_clunk(v9ses, newfid, &fcall))
453                         v9fs_put_idpool(newfid, &v9ses->fidpool);
454                 else
455                         dprintk(DEBUG_ERROR, "clunk failed: %s\n",
456                                 FCALL_ERROR(fcall));
457
458                 kfree(fcall);
459         }
460         if (wfidno >= 0) {
461                 if (!v9fs_t_clunk(v9ses, wfidno, &fcall))
462                         v9fs_put_idpool(wfidno, &v9ses->fidpool);
463                 else
464                         dprintk(DEBUG_ERROR, "clunk failed: %s\n",
465                                 FCALL_ERROR(fcall));
466
467                 kfree(fcall);
468         }
469         return result;
470 }
471
472 /**
473  * v9fs_remove - helper function to remove files and directories
474  * @dir: directory inode that is being deleted
475  * @file:  dentry that is being deleted
476  * @rmdir: removing a directory
477  *
478  */
479
480 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
481 {
482         struct v9fs_fcall *fcall = NULL;
483         struct super_block *sb = NULL;
484         struct v9fs_session_info *v9ses = NULL;
485         struct v9fs_fid *v9fid = NULL;
486         struct inode *file_inode = NULL;
487         int fid = -1;
488         int result = 0;
489
490         dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
491                 rmdir);
492
493         file_inode = file->d_inode;
494         sb = file_inode->i_sb;
495         v9ses = v9fs_inode2v9ses(file_inode);
496         v9fid = v9fs_fid_lookup(file);
497
498         if (!v9fid) {
499                 dprintk(DEBUG_ERROR,
500                         "no v9fs_fid\n");
501                 return -EBADF;
502         }
503
504         fid = v9fid->fid;
505         if (fid < 0) {
506                 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
507                         file_inode->i_ino);
508                 return -EBADF;
509         }
510
511         result = v9fs_t_remove(v9ses, fid, &fcall);
512         if (result < 0)
513                 dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n",
514                         FCALL_ERROR(fcall), result);
515         else {
516                 v9fs_put_idpool(fid, &v9ses->fidpool);
517                 v9fs_fid_destroy(v9fid);
518         }
519
520         kfree(fcall);
521         return result;
522 }
523
524 /**
525  * v9fs_vfs_create - VFS hook to create files
526  * @inode: directory inode that is being deleted
527  * @dentry:  dentry that is being deleted
528  * @perm: create permissions
529  * @nd: path information
530  *
531  */
532
533 static int
534 v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
535                 struct nameidata *nd)
536 {
537         return v9fs_create(inode, dentry, perm, O_RDWR);
538 }
539
540 /**
541  * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
542  * @inode:  inode that is being unlinked
543  * @dentry: dentry that is being unlinked
544  * @mode: mode for new directory
545  *
546  */
547
548 static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode)
549 {
550         return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY);
551 }
552
553 /**
554  * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
555  * @dir:  inode that is being walked from
556  * @dentry: dentry that is being walked to?
557  * @nameidata: path data
558  *
559  */
560
561 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
562                                       struct nameidata *nameidata)
563 {
564         struct super_block *sb;
565         struct v9fs_session_info *v9ses;
566         struct v9fs_fid *dirfid;
567         struct v9fs_fid *fid;
568         struct inode *inode;
569         struct v9fs_fcall *fcall = NULL;
570         struct stat newstat;
571         int dirfidnum = -1;
572         int newfid = -1;
573         int result = 0;
574
575         dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
576                 dir, dentry->d_iname, dentry, nameidata);
577
578         sb = dir->i_sb;
579         v9ses = v9fs_inode2v9ses(dir);
580         dirfid = v9fs_fid_lookup(dentry->d_parent);
581
582         if (!dirfid) {
583                 dprintk(DEBUG_ERROR, "no dirfid\n");
584                 return ERR_PTR(-EINVAL);
585         }
586
587         dirfidnum = dirfid->fid;
588
589         if (dirfidnum < 0) {
590                 dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n",
591                         dir, dir->i_ino);
592                 return ERR_PTR(-EBADF);
593         }
594
595         newfid = v9fs_get_idpool(&v9ses->fidpool);
596         if (newfid < 0) {
597                 eprintk(KERN_WARNING, "newfid fails!\n");
598                 return ERR_PTR(-ENOSPC);
599         }
600
601         result =
602             v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name,
603                         NULL);
604         if (result < 0) {
605                 v9fs_put_idpool(newfid, &v9ses->fidpool);
606                 if (result == -ENOENT) {
607                         d_add(dentry, NULL);
608                         dprintk(DEBUG_VFS,
609                                 "Return negative dentry %p count %d\n",
610                                 dentry, atomic_read(&dentry->d_count));
611                         return NULL;
612                 }
613                 dprintk(DEBUG_ERROR, "walk error:%d\n", result);
614                 goto FreeFcall;
615         }
616
617         result = v9fs_t_stat(v9ses, newfid, &fcall);
618         if (result < 0) {
619                 dprintk(DEBUG_ERROR, "stat error\n");
620                 goto FreeFcall;
621         }
622
623         v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
624         inode = v9fs_get_inode(sb, newstat.st_mode);
625
626         if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
627                 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
628                         PTR_ERR(inode));
629
630                 result = -ENOSPC;
631                 goto FreeFcall;
632         }
633
634         inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid);
635
636         fid = v9fs_fid_create(dentry, v9ses, newfid, 0);
637         if (fid == NULL) {
638                 dprintk(DEBUG_ERROR, "couldn't insert\n");
639                 result = -ENOMEM;
640                 goto FreeFcall;
641         }
642
643         fid->qid = fcall->params.rstat.stat->qid;
644
645         dentry->d_op = &v9fs_dentry_operations;
646         v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb);
647
648         d_add(dentry, inode);
649         kfree(fcall);
650
651         return NULL;
652
653       FreeFcall:
654         kfree(fcall);
655         return ERR_PTR(result);
656 }
657
658 /**
659  * v9fs_vfs_unlink - VFS unlink hook to delete an inode
660  * @i:  inode that is being unlinked
661  * @d: dentry that is being unlinked
662  *
663  */
664
665 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
666 {
667         return v9fs_remove(i, d, 0);
668 }
669
670 /**
671  * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
672  * @i:  inode that is being unlinked
673  * @d: dentry that is being unlinked
674  *
675  */
676
677 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
678 {
679         return v9fs_remove(i, d, 1);
680 }
681
682 /**
683  * v9fs_vfs_rename - VFS hook to rename an inode
684  * @old_dir:  old dir inode
685  * @old_dentry: old dentry
686  * @new_dir: new dir inode
687  * @new_dentry: new dentry
688  *
689  */
690
691 static int
692 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
693                 struct inode *new_dir, struct dentry *new_dentry)
694 {
695         struct inode *old_inode = old_dentry->d_inode;
696         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
697         struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
698         struct v9fs_fid *olddirfid =
699             v9fs_fid_lookup(old_dentry->d_parent);
700         struct v9fs_fid *newdirfid =
701             v9fs_fid_lookup(new_dentry->d_parent);
702         struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
703         struct v9fs_fcall *fcall = NULL;
704         int fid = -1;
705         int olddirfidnum = -1;
706         int newdirfidnum = -1;
707         int retval = 0;
708
709         dprintk(DEBUG_VFS, "\n");
710
711         if (!mistat)
712                 return -ENOMEM;
713
714         if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
715                 dprintk(DEBUG_ERROR, "problem with arguments\n");
716                 return -EBADF;
717         }
718
719         /* 9P can only handle file rename in the same directory */
720         if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
721                 dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
722                 retval = -EPERM;
723                 goto FreeFcallnBail;
724         }
725
726         fid = oldfid->fid;
727         olddirfidnum = olddirfid->fid;
728         newdirfidnum = newdirfid->fid;
729
730         if (fid < 0) {
731                 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
732                         old_inode->i_ino);
733                 retval = -EBADF;
734                 goto FreeFcallnBail;
735         }
736
737         v9fs_blank_mistat(v9ses, mistat);
738
739         strcpy(mistat->data + 1, v9ses->name);
740         mistat->name = mistat->data + 1 + strlen(v9ses->name);
741
742         if (new_dentry->d_name.len >
743             (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) {
744                 dprintk(DEBUG_ERROR, "new name too long\n");
745                 goto FreeFcallnBail;
746         }
747
748         strcpy(mistat->name, new_dentry->d_name.name);
749         retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall);
750
751       FreeFcallnBail:
752         kfree(mistat);
753
754         if (retval < 0)
755                 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
756                         FCALL_ERROR(fcall));
757
758         kfree(fcall);
759         return retval;
760 }
761
762 /**
763  * v9fs_vfs_getattr - retreive file metadata
764  * @mnt - mount information
765  * @dentry - file to get attributes on
766  * @stat - metadata structure to populate
767  *
768  */
769
770 static int
771 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
772                  struct kstat *stat)
773 {
774         struct v9fs_fcall *fcall = NULL;
775         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
776         struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
777         int err = -EPERM;
778
779         dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
780         if (!fid) {
781                 dprintk(DEBUG_ERROR,
782                         "couldn't find fid associated with dentry\n");
783                 return -EBADF;
784         }
785
786         err = v9fs_t_stat(v9ses, fid->fid, &fcall);
787
788         if (err < 0)
789                 dprintk(DEBUG_ERROR, "stat error\n");
790         else {
791                 v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode,
792                                   dentry->d_inode->i_sb);
793                 generic_fillattr(dentry->d_inode, stat);
794         }
795
796         kfree(fcall);
797         return err;
798 }
799
800 /**
801  * v9fs_vfs_setattr - set file metadata
802  * @dentry: file whose metadata to set
803  * @iattr: metadata assignment structure
804  *
805  */
806
807 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
808 {
809         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
810         struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
811         struct v9fs_fcall *fcall = NULL;
812         struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
813         int res = -EPERM;
814
815         dprintk(DEBUG_VFS, "\n");
816
817         if (!mistat)
818                 return -ENOMEM;
819
820         if (!fid) {
821                 dprintk(DEBUG_ERROR,
822                         "Couldn't find fid associated with dentry\n");
823                 return -EBADF;
824         }
825
826         v9fs_blank_mistat(v9ses, mistat);
827         if (iattr->ia_valid & ATTR_MODE)
828                 mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode);
829
830         if (iattr->ia_valid & ATTR_MTIME)
831                 mistat->mtime = iattr->ia_mtime.tv_sec;
832
833         if (iattr->ia_valid & ATTR_ATIME)
834                 mistat->atime = iattr->ia_atime.tv_sec;
835
836         if (iattr->ia_valid & ATTR_SIZE)
837                 mistat->length = iattr->ia_size;
838
839         if (v9ses->extended) {
840                 char *ptr = mistat->data+1;
841
842                 if (iattr->ia_valid & ATTR_UID) {
843                         mistat->uid = ptr;
844                         ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid);
845                         mistat->n_uid = iattr->ia_uid;
846                 }
847
848                 if (iattr->ia_valid & ATTR_GID) {
849                         mistat->gid = ptr;
850                         ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid);
851                         mistat->n_gid = iattr->ia_gid;
852                 }
853         }
854
855         res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall);
856
857         if (res < 0)
858                 dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall));
859
860         kfree(mistat);
861         kfree(fcall);
862
863         if (res >= 0)
864                 res = inode_setattr(dentry->d_inode, iattr);
865
866         return res;
867 }
868
869 /**
870  * v9fs_mistat2inode - populate an inode structure with mistat info
871  * @mistat: Plan 9 metadata (mistat) structure
872  * @inode: inode to populate
873  * @sb: superblock of filesystem
874  *
875  */
876
877 void
878 v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode,
879                   struct super_block *sb)
880 {
881         struct v9fs_session_info *v9ses = sb->s_fs_info;
882
883         inode->i_nlink = 1;
884
885         inode->i_atime.tv_sec = mistat->atime;
886         inode->i_mtime.tv_sec = mistat->mtime;
887         inode->i_ctime.tv_sec = mistat->mtime;
888
889         inode->i_uid = -1;
890         inode->i_gid = -1;
891
892         if (v9ses->extended) {
893                 /* TODO: string to uid mapping via user-space daemon */
894                 inode->i_uid = mistat->n_uid;
895                 inode->i_gid = mistat->n_gid;
896
897                 if (mistat->n_uid == -1)
898                         sscanf(mistat->uid, "%x", &inode->i_uid);
899
900                 if (mistat->n_gid == -1)
901                         sscanf(mistat->gid, "%x", &inode->i_gid);
902         }
903
904         if (inode->i_uid == -1)
905                 inode->i_uid = v9ses->uid;
906         if (inode->i_gid == -1)
907                 inode->i_gid = v9ses->gid;
908
909         inode->i_mode = p9mode2unixmode(v9ses, mistat->mode);
910         if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
911                 char type = 0;
912                 int major = -1;
913                 int minor = -1;
914                 sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
915                 switch (type) {
916                 case 'c':
917                         inode->i_mode &= ~S_IFBLK;
918                         inode->i_mode |= S_IFCHR;
919                         break;
920                 case 'b':
921                         break;
922                 default:
923                         dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
924                                 type, mistat->extension);
925                 };
926                 inode->i_rdev = MKDEV(major, minor);
927         } else
928                 inode->i_rdev = 0;
929
930         inode->i_size = mistat->length;
931
932         inode->i_blksize = sb->s_blocksize;
933         inode->i_blocks =
934             (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits;
935 }
936
937 /**
938  * v9fs_qid2ino - convert qid into inode number
939  * @qid: qid to hash
940  *
941  * BUG: potential for inode number collisions?
942  */
943
944 ino_t v9fs_qid2ino(struct v9fs_qid *qid)
945 {
946         u64 path = qid->path + 2;
947         ino_t i = 0;
948
949         if (sizeof(ino_t) == sizeof(path))
950                 memcpy(&i, &path, sizeof(ino_t));
951         else
952                 i = (ino_t) (path ^ (path >> 32));
953
954         return i;
955 }
956
957 /**
958  * v9fs_vfs_symlink - helper function to create symlinks
959  * @dir: directory inode containing symlink
960  * @dentry: dentry for symlink
961  * @symname: symlink data
962  *
963  * See 9P2000.u RFC for more information
964  *
965  */
966
967 static int
968 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
969 {
970         int retval = -EPERM;
971         struct v9fs_fid *newfid;
972         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
973         struct v9fs_fcall *fcall = NULL;
974         struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
975
976         dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
977                 symname);
978
979         if (!mistat)
980                 return -ENOMEM;
981
982         if (!v9ses->extended) {
983                 dprintk(DEBUG_ERROR, "not extended\n");
984                 goto FreeFcall;
985         }
986
987         /* issue a create */
988         retval = v9fs_create(dir, dentry, S_IFLNK, 0);
989         if (retval != 0)
990                 goto FreeFcall;
991
992         newfid = v9fs_fid_lookup(dentry);
993
994         /* issue a twstat */
995         v9fs_blank_mistat(v9ses, mistat);
996         strcpy(mistat->data + 1, symname);
997         mistat->extension = mistat->data + 1;
998         retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
999         if (retval < 0) {
1000                 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1001                         FCALL_ERROR(fcall));
1002                 goto FreeFcall;
1003         }
1004
1005         kfree(fcall);
1006
1007         if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1008                 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1009                         FCALL_ERROR(fcall));
1010                 goto FreeFcall;
1011         }
1012
1013         d_drop(dentry);         /* FID - will this also clunk? */
1014
1015       FreeFcall:
1016         kfree(mistat);
1017         kfree(fcall);
1018
1019         return retval;
1020 }
1021
1022 /**
1023  * v9fs_readlink - read a symlink's location (internal version)
1024  * @dentry: dentry for symlink
1025  * @buffer: buffer to load symlink location into
1026  * @buflen: length of buffer
1027  *
1028  */
1029
1030 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1031 {
1032         int retval = -EPERM;
1033
1034         struct v9fs_fcall *fcall = NULL;
1035         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
1036         struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
1037
1038         if (!fid) {
1039                 dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n");
1040                 retval = -EBADF;
1041                 goto FreeFcall;
1042         }
1043
1044         if (!v9ses->extended) {
1045                 retval = -EBADF;
1046                 dprintk(DEBUG_ERROR, "not extended\n");
1047                 goto FreeFcall;
1048         }
1049
1050         dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
1051         retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
1052
1053         if (retval < 0) {
1054                 dprintk(DEBUG_ERROR, "stat error\n");
1055                 goto FreeFcall;
1056         }
1057
1058         if (!fcall)
1059                 return -EIO;
1060
1061         if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) {
1062                 retval = -EINVAL;
1063                 goto FreeFcall;
1064         }
1065
1066         /* copy extension buffer into buffer */
1067         if (strlen(fcall->params.rstat.stat->extension) < buflen)
1068                 buflen = strlen(fcall->params.rstat.stat->extension);
1069
1070         memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1);
1071
1072         retval = buflen;
1073
1074       FreeFcall:
1075         kfree(fcall);
1076
1077         return retval;
1078 }
1079
1080 /**
1081  * v9fs_vfs_readlink - read a symlink's location
1082  * @dentry: dentry for symlink
1083  * @buf: buffer to load symlink location into
1084  * @buflen: length of buffer
1085  *
1086  */
1087
1088 static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
1089                              int buflen)
1090 {
1091         int retval;
1092         int ret;
1093         char *link = __getname();
1094
1095         if (buflen > PATH_MAX)
1096                 buflen = PATH_MAX;
1097
1098         dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
1099
1100         retval = v9fs_readlink(dentry, link, buflen);
1101
1102         if (retval > 0) {
1103                 if ((ret = copy_to_user(buffer, link, retval)) != 0) {
1104                         dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
1105                                 ret);
1106                         retval = ret;
1107                 }
1108         }
1109
1110         __putname(link);
1111         return retval;
1112 }
1113
1114 /**
1115  * v9fs_vfs_follow_link - follow a symlink path
1116  * @dentry: dentry for symlink
1117  * @nd: nameidata
1118  *
1119  */
1120
1121 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1122 {
1123         int len = 0;
1124         char *link = __getname();
1125
1126         dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
1127
1128         if (!link)
1129                 link = ERR_PTR(-ENOMEM);
1130         else {
1131                 len = v9fs_readlink(dentry, link, strlen(link));
1132
1133                 if (len < 0) {
1134                         __putname(link);
1135                         link = ERR_PTR(len);
1136                 } else
1137                         link[len] = 0;
1138         }
1139         nd_set_link(nd, link);
1140
1141         return NULL;
1142 }
1143
1144 /**
1145  * v9fs_vfs_put_link - release a symlink path
1146  * @dentry: dentry for symlink
1147  * @nd: nameidata
1148  *
1149  */
1150
1151 static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1152 {
1153         char *s = nd_get_link(nd);
1154
1155         dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
1156         if (!IS_ERR(s))
1157                 __putname(s);
1158 }
1159
1160 /**
1161  * v9fs_vfs_link - create a hardlink
1162  * @old_dentry: dentry for file to link to
1163  * @dir: inode destination for new link
1164  * @dentry: dentry for link
1165  *
1166  */
1167
1168 /* XXX - lots of code dup'd from symlink and creates,
1169  * figure out a better reuse strategy
1170  */
1171
1172 static int
1173 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1174               struct dentry *dentry)
1175 {
1176         int retval = -EPERM;
1177         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1178         struct v9fs_fcall *fcall = NULL;
1179         struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
1180         struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
1181         struct v9fs_fid *newfid = NULL;
1182         char *symname = __getname();
1183
1184         dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1185                 old_dentry->d_name.name);
1186
1187         if (!v9ses->extended) {
1188                 dprintk(DEBUG_ERROR, "not extended\n");
1189                 goto FreeMem;
1190         }
1191
1192         /* get fid of old_dentry */
1193         sprintf(symname, "hardlink(%d)\n", oldfid->fid);
1194
1195         /* issue a create */
1196         retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0);
1197         if (retval != 0)
1198                 goto FreeMem;
1199
1200         newfid = v9fs_fid_lookup(dentry);
1201         if (!newfid) {
1202                 dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
1203                 goto FreeMem;
1204         }
1205
1206         /* issue a twstat */
1207         v9fs_blank_mistat(v9ses, mistat);
1208         strcpy(mistat->data + 1, symname);
1209         mistat->extension = mistat->data + 1;
1210         retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1211         if (retval < 0) {
1212                 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1213                         FCALL_ERROR(fcall));
1214                 goto FreeMem;
1215         }
1216
1217         kfree(fcall);
1218
1219         if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1220                 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1221                         FCALL_ERROR(fcall));
1222                 goto FreeMem;
1223         }
1224
1225         d_drop(dentry);         /* FID - will this also clunk? */
1226
1227         kfree(fcall);
1228         fcall = NULL;
1229
1230       FreeMem:
1231         kfree(mistat);
1232         kfree(fcall);
1233         __putname(symname);
1234         return retval;
1235 }
1236
1237 /**
1238  * v9fs_vfs_mknod - create a special file
1239  * @dir: inode destination for new link
1240  * @dentry: dentry for file
1241  * @mode: mode for creation
1242  * @dev_t: device associated with special file
1243  *
1244  */
1245
1246 static int
1247 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1248 {
1249         int retval = -EPERM;
1250         struct v9fs_fid *newfid;
1251         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1252         struct v9fs_fcall *fcall = NULL;
1253         struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
1254         char *symname = __getname();
1255
1256         dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1257                 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1258
1259         if (!mistat)
1260                 return -ENOMEM;
1261
1262         if (!new_valid_dev(rdev)) {
1263                 retval = -EINVAL;
1264                 goto FreeMem;
1265         }
1266
1267         if (!v9ses->extended) {
1268                 dprintk(DEBUG_ERROR, "not extended\n");
1269                 goto FreeMem;
1270         }
1271
1272         /* issue a create */
1273         retval = v9fs_create(dir, dentry, mode, 0);
1274
1275         if (retval != 0)
1276                 goto FreeMem;
1277
1278         newfid = v9fs_fid_lookup(dentry);
1279         if (!newfid) {
1280                 dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n");
1281                 retval = -EINVAL;
1282                 goto FreeMem;
1283         }
1284
1285         /* build extension */
1286         if (S_ISBLK(mode))
1287                 sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev));
1288         else if (S_ISCHR(mode))
1289                 sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev));
1290         else if (S_ISFIFO(mode))
1291                 ;       /* DO NOTHING */
1292         else {
1293                 retval = -EINVAL;
1294                 goto FreeMem;
1295         }
1296
1297         if (!S_ISFIFO(mode)) {
1298                 /* issue a twstat */
1299                 v9fs_blank_mistat(v9ses, mistat);
1300                 strcpy(mistat->data + 1, symname);
1301                 mistat->extension = mistat->data + 1;
1302                 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1303                 if (retval < 0) {
1304                         dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1305                                 FCALL_ERROR(fcall));
1306                         goto FreeMem;
1307                 }
1308         }
1309
1310         /* need to update dcache so we show up */
1311         kfree(fcall);
1312
1313         if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1314                 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1315                         FCALL_ERROR(fcall));
1316                 goto FreeMem;
1317         }
1318
1319         d_drop(dentry);         /* FID - will this also clunk? */
1320
1321       FreeMem:
1322         kfree(mistat);
1323         kfree(fcall);
1324         __putname(symname);
1325
1326         return retval;
1327 }
1328
1329 static struct inode_operations v9fs_dir_inode_operations_ext = {
1330         .create = v9fs_vfs_create,
1331         .lookup = v9fs_vfs_lookup,
1332         .symlink = v9fs_vfs_symlink,
1333         .link = v9fs_vfs_link,
1334         .unlink = v9fs_vfs_unlink,
1335         .mkdir = v9fs_vfs_mkdir,
1336         .rmdir = v9fs_vfs_rmdir,
1337         .mknod = v9fs_vfs_mknod,
1338         .rename = v9fs_vfs_rename,
1339         .readlink = v9fs_vfs_readlink,
1340         .getattr = v9fs_vfs_getattr,
1341         .setattr = v9fs_vfs_setattr,
1342 };
1343
1344 static struct inode_operations v9fs_dir_inode_operations = {
1345         .create = v9fs_vfs_create,
1346         .lookup = v9fs_vfs_lookup,
1347         .unlink = v9fs_vfs_unlink,
1348         .mkdir = v9fs_vfs_mkdir,
1349         .rmdir = v9fs_vfs_rmdir,
1350         .mknod = v9fs_vfs_mknod,
1351         .rename = v9fs_vfs_rename,
1352         .getattr = v9fs_vfs_getattr,
1353         .setattr = v9fs_vfs_setattr,
1354 };
1355
1356 static struct inode_operations v9fs_file_inode_operations = {
1357         .getattr = v9fs_vfs_getattr,
1358         .setattr = v9fs_vfs_setattr,
1359 };
1360
1361 static struct inode_operations v9fs_symlink_inode_operations = {
1362         .readlink = v9fs_vfs_readlink,
1363         .follow_link = v9fs_vfs_follow_link,
1364         .put_link = v9fs_vfs_put_link,
1365         .getattr = v9fs_vfs_getattr,
1366         .setattr = v9fs_vfs_setattr,
1367 };