blob: 2c122ee83adbdd3d693c2c8a4fb671aeca4b85f3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * inode.c
3 *
4 * Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
5 * Copyright (C) 1997 by Volker Lendecke
6 *
7 * Please add a note about your changes to smbfs in the ChangeLog file.
8 */
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/module.h>
11#include <linux/time.h>
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/string.h>
15#include <linux/stat.h>
16#include <linux/errno.h>
17#include <linux/slab.h>
18#include <linux/init.h>
19#include <linux/file.h>
20#include <linux/dcache.h>
21#include <linux/smp_lock.h>
22#include <linux/nls.h>
23#include <linux/seq_file.h>
24#include <linux/mount.h>
25#include <linux/net.h>
26#include <linux/vfs.h>
27#include <linux/highuid.h>
28#include <linux/smb_fs.h>
29#include <linux/smbno.h>
30#include <linux/smb_mount.h>
31
32#include <asm/system.h>
33#include <asm/uaccess.h>
34
35#include "smb_debug.h"
36#include "getopt.h"
37#include "proto.h"
38
39/* Always pick a default string */
40#ifdef CONFIG_SMB_NLS_REMOTE
41#define SMB_NLS_REMOTE CONFIG_SMB_NLS_REMOTE
42#else
43#define SMB_NLS_REMOTE ""
44#endif
45
46#define SMB_TTL_DEFAULT 1000
47
48static void smb_delete_inode(struct inode *);
49static void smb_put_super(struct super_block *);
David Howells726c3342006-06-23 02:02:58 -070050static int smb_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051static int smb_show_options(struct seq_file *, struct vfsmount *);
52
53static kmem_cache_t *smb_inode_cachep;
54
55static struct inode *smb_alloc_inode(struct super_block *sb)
56{
57 struct smb_inode_info *ei;
58 ei = (struct smb_inode_info *)kmem_cache_alloc(smb_inode_cachep, SLAB_KERNEL);
59 if (!ei)
60 return NULL;
61 return &ei->vfs_inode;
62}
63
64static void smb_destroy_inode(struct inode *inode)
65{
66 kmem_cache_free(smb_inode_cachep, SMB_I(inode));
67}
68
69static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
70{
71 struct smb_inode_info *ei = (struct smb_inode_info *) foo;
72 unsigned long flagmask = SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR;
73
74 if ((flags & flagmask) == SLAB_CTOR_CONSTRUCTOR)
75 inode_init_once(&ei->vfs_inode);
76}
77
78static int init_inodecache(void)
79{
80 smb_inode_cachep = kmem_cache_create("smb_inode_cache",
81 sizeof(struct smb_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -080082 0, (SLAB_RECLAIM_ACCOUNT|
83 SLAB_MEM_SPREAD),
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 init_once, NULL);
85 if (smb_inode_cachep == NULL)
86 return -ENOMEM;
87 return 0;
88}
89
90static void destroy_inodecache(void)
91{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -070092 kmem_cache_destroy(smb_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
94
95static int smb_remount(struct super_block *sb, int *flags, char *data)
96{
97 *flags |= MS_NODIRATIME;
98 return 0;
99}
100
101static struct super_operations smb_sops =
102{
103 .alloc_inode = smb_alloc_inode,
104 .destroy_inode = smb_destroy_inode,
105 .drop_inode = generic_delete_inode,
106 .delete_inode = smb_delete_inode,
107 .put_super = smb_put_super,
108 .statfs = smb_statfs,
109 .show_options = smb_show_options,
110 .remount_fs = smb_remount,
111};
112
113
114/* We are always generating a new inode here */
115struct inode *
116smb_iget(struct super_block *sb, struct smb_fattr *fattr)
117{
118 struct smb_sb_info *server = SMB_SB(sb);
119 struct inode *result;
120
121 DEBUG1("smb_iget: %p\n", fattr);
122
123 result = new_inode(sb);
124 if (!result)
125 return result;
126 result->i_ino = fattr->f_ino;
127 SMB_I(result)->open = 0;
128 SMB_I(result)->fileid = 0;
129 SMB_I(result)->access = 0;
130 SMB_I(result)->flags = 0;
131 SMB_I(result)->closed = 0;
132 SMB_I(result)->openers = 0;
133 smb_set_inode_attr(result, fattr);
134 if (S_ISREG(result->i_mode)) {
135 result->i_op = &smb_file_inode_operations;
136 result->i_fop = &smb_file_operations;
137 result->i_data.a_ops = &smb_file_aops;
138 } else if (S_ISDIR(result->i_mode)) {
139 if (server->opt.capabilities & SMB_CAP_UNIX)
140 result->i_op = &smb_dir_inode_operations_unix;
141 else
142 result->i_op = &smb_dir_inode_operations;
143 result->i_fop = &smb_dir_operations;
144 } else if (S_ISLNK(result->i_mode)) {
145 result->i_op = &smb_link_inode_operations;
146 } else {
147 init_special_inode(result, result->i_mode, fattr->f_rdev);
148 }
149 insert_inode_hash(result);
150 return result;
151}
152
153/*
154 * Copy the inode data to a smb_fattr structure.
155 */
156void
157smb_get_inode_attr(struct inode *inode, struct smb_fattr *fattr)
158{
159 memset(fattr, 0, sizeof(struct smb_fattr));
160 fattr->f_mode = inode->i_mode;
161 fattr->f_nlink = inode->i_nlink;
162 fattr->f_ino = inode->i_ino;
163 fattr->f_uid = inode->i_uid;
164 fattr->f_gid = inode->i_gid;
165 fattr->f_size = inode->i_size;
166 fattr->f_mtime = inode->i_mtime;
167 fattr->f_ctime = inode->i_ctime;
168 fattr->f_atime = inode->i_atime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 fattr->f_blocks = inode->i_blocks;
170
171 fattr->attr = SMB_I(inode)->attr;
172 /*
173 * Keep the attributes in sync with the inode permissions.
174 */
175 if (fattr->f_mode & S_IWUSR)
176 fattr->attr &= ~aRONLY;
177 else
178 fattr->attr |= aRONLY;
179}
180
181/*
182 * Update the inode, possibly causing it to invalidate its pages if mtime/size
183 * is different from last time.
184 */
185void
186smb_set_inode_attr(struct inode *inode, struct smb_fattr *fattr)
187{
188 struct smb_inode_info *ei = SMB_I(inode);
189
190 /*
191 * A size change should have a different mtime, or same mtime
192 * but different size.
193 */
194 time_t last_time = inode->i_mtime.tv_sec;
195 loff_t last_sz = inode->i_size;
196
197 inode->i_mode = fattr->f_mode;
198 inode->i_nlink = fattr->f_nlink;
199 inode->i_uid = fattr->f_uid;
200 inode->i_gid = fattr->f_gid;
201 inode->i_ctime = fattr->f_ctime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 inode->i_blocks = fattr->f_blocks;
203 inode->i_size = fattr->f_size;
204 inode->i_mtime = fattr->f_mtime;
205 inode->i_atime = fattr->f_atime;
206 ei->attr = fattr->attr;
207
208 /*
209 * Update the "last time refreshed" field for revalidation.
210 */
211 ei->oldmtime = jiffies;
212
213 if (inode->i_mtime.tv_sec != last_time || inode->i_size != last_sz) {
214 VERBOSE("%ld changed, old=%ld, new=%ld, oz=%ld, nz=%ld\n",
215 inode->i_ino,
Kirk True58bf6a22006-03-25 03:07:30 -0800216 (long) last_time, (long) inode->i_mtime.tv_sec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 (long) last_sz, (long) inode->i_size);
218
219 if (!S_ISDIR(inode->i_mode))
220 invalidate_remote_inode(inode);
221 }
222}
223
224/*
225 * This is called if the connection has gone bad ...
226 * try to kill off all the current inodes.
227 */
228void
229smb_invalidate_inodes(struct smb_sb_info *server)
230{
231 VERBOSE("\n");
232 shrink_dcache_sb(SB_of(server));
233 invalidate_inodes(SB_of(server));
234}
235
236/*
237 * This is called to update the inode attributes after
238 * we've made changes to a file or directory.
239 */
240static int
241smb_refresh_inode(struct dentry *dentry)
242{
243 struct inode *inode = dentry->d_inode;
244 int error;
245 struct smb_fattr fattr;
246
247 error = smb_proc_getattr(dentry, &fattr);
248 if (!error) {
249 smb_renew_times(dentry);
250 /*
251 * Check whether the type part of the mode changed,
252 * and don't update the attributes if it did.
253 *
254 * And don't dick with the root inode
255 */
256 if (inode->i_ino == 2)
257 return error;
258 if (S_ISLNK(inode->i_mode))
259 return error; /* VFS will deal with it */
260
261 if ((inode->i_mode & S_IFMT) == (fattr.f_mode & S_IFMT)) {
262 smb_set_inode_attr(inode, &fattr);
263 } else {
264 /*
265 * Big trouble! The inode has become a new object,
266 * so any operations attempted on it are invalid.
267 *
268 * To limit damage, mark the inode as bad so that
269 * subsequent lookup validations will fail.
270 */
271 PARANOIA("%s/%s changed mode, %07o to %07o\n",
272 DENTRY_PATH(dentry),
273 inode->i_mode, fattr.f_mode);
274
275 fattr.f_mode = inode->i_mode; /* save mode */
276 make_bad_inode(inode);
277 inode->i_mode = fattr.f_mode; /* restore mode */
278 /*
279 * No need to worry about unhashing the dentry: the
280 * lookup validation will see that the inode is bad.
281 * But we do want to invalidate the caches ...
282 */
283 if (!S_ISDIR(inode->i_mode))
284 invalidate_remote_inode(inode);
285 else
286 smb_invalid_dir_cache(inode);
287 error = -EIO;
288 }
289 }
290 return error;
291}
292
293/*
294 * This is called when we want to check whether the inode
295 * has changed on the server. If it has changed, we must
296 * invalidate our local caches.
297 */
298int
299smb_revalidate_inode(struct dentry *dentry)
300{
301 struct smb_sb_info *s = server_from_dentry(dentry);
302 struct inode *inode = dentry->d_inode;
303 int error = 0;
304
305 DEBUG1("smb_revalidate_inode\n");
306 lock_kernel();
307
308 /*
309 * Check whether we've recently refreshed the inode.
310 */
311 if (time_before(jiffies, SMB_I(inode)->oldmtime + SMB_MAX_AGE(s))) {
312 VERBOSE("up-to-date, ino=%ld, jiffies=%lu, oldtime=%lu\n",
313 inode->i_ino, jiffies, SMB_I(inode)->oldmtime);
314 goto out;
315 }
316
317 error = smb_refresh_inode(dentry);
318out:
319 unlock_kernel();
320 return error;
321}
322
323/*
324 * This routine is called when i_nlink == 0 and i_count goes to 0.
325 * All blocking cleanup operations need to go here to avoid races.
326 */
327static void
328smb_delete_inode(struct inode *ino)
329{
330 DEBUG1("ino=%ld\n", ino->i_ino);
Mark Fashehfef26652005-09-09 13:01:31 -0700331 truncate_inode_pages(&ino->i_data, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 lock_kernel();
333 if (smb_close(ino))
334 PARANOIA("could not close inode %ld\n", ino->i_ino);
335 unlock_kernel();
336 clear_inode(ino);
337}
338
339static struct option opts[] = {
340 { "version", 0, 'v' },
341 { "win95", SMB_MOUNT_WIN95, 1 },
342 { "oldattr", SMB_MOUNT_OLDATTR, 1 },
343 { "dirattr", SMB_MOUNT_DIRATTR, 1 },
344 { "case", SMB_MOUNT_CASE, 1 },
345 { "uid", 0, 'u' },
346 { "gid", 0, 'g' },
347 { "file_mode", 0, 'f' },
348 { "dir_mode", 0, 'd' },
349 { "iocharset", 0, 'i' },
350 { "codepage", 0, 'c' },
351 { "ttl", 0, 't' },
352 { NULL, 0, 0}
353};
354
355static int
356parse_options(struct smb_mount_data_kernel *mnt, char *options)
357{
358 int c;
359 unsigned long flags;
360 unsigned long value;
361 char *optarg;
362 char *optopt;
363
364 flags = 0;
365 while ( (c = smb_getopt("smbfs", &options, opts,
366 &optopt, &optarg, &flags, &value)) > 0) {
367
368 VERBOSE("'%s' -> '%s'\n", optopt, optarg ? optarg : "<none>");
369 switch (c) {
370 case 1:
371 /* got a "flag" option */
372 break;
373 case 'v':
374 if (value != SMB_MOUNT_VERSION) {
375 printk ("smbfs: Bad mount version %ld, expected %d\n",
376 value, SMB_MOUNT_VERSION);
377 return 0;
378 }
379 mnt->version = value;
380 break;
381 case 'u':
382 mnt->uid = value;
383 flags |= SMB_MOUNT_UID;
384 break;
385 case 'g':
386 mnt->gid = value;
387 flags |= SMB_MOUNT_GID;
388 break;
389 case 'f':
390 mnt->file_mode = (value & S_IRWXUGO) | S_IFREG;
391 flags |= SMB_MOUNT_FMODE;
392 break;
393 case 'd':
394 mnt->dir_mode = (value & S_IRWXUGO) | S_IFDIR;
395 flags |= SMB_MOUNT_DMODE;
396 break;
397 case 'i':
398 strlcpy(mnt->codepage.local_name, optarg,
399 SMB_NLS_MAXNAMELEN);
400 break;
401 case 'c':
402 strlcpy(mnt->codepage.remote_name, optarg,
403 SMB_NLS_MAXNAMELEN);
404 break;
405 case 't':
406 mnt->ttl = value;
407 break;
408 default:
409 printk ("smbfs: Unrecognized mount option %s\n",
410 optopt);
411 return -1;
412 }
413 }
414 mnt->flags = flags;
415 return c;
416}
417
418/*
419 * smb_show_options() is for displaying mount options in /proc/mounts.
420 * It tries to avoid showing settings that were not changed from their
421 * defaults.
422 */
423static int
424smb_show_options(struct seq_file *s, struct vfsmount *m)
425{
426 struct smb_mount_data_kernel *mnt = SMB_SB(m->mnt_sb)->mnt;
427 int i;
428
429 for (i = 0; opts[i].name != NULL; i++)
430 if (mnt->flags & opts[i].flag)
431 seq_printf(s, ",%s", opts[i].name);
432
433 if (mnt->flags & SMB_MOUNT_UID)
434 seq_printf(s, ",uid=%d", mnt->uid);
435 if (mnt->flags & SMB_MOUNT_GID)
436 seq_printf(s, ",gid=%d", mnt->gid);
437 if (mnt->mounted_uid != 0)
438 seq_printf(s, ",mounted_uid=%d", mnt->mounted_uid);
439
440 /*
441 * Defaults for file_mode and dir_mode are unknown to us; they
442 * depend on the current umask of the user doing the mount.
443 */
444 if (mnt->flags & SMB_MOUNT_FMODE)
445 seq_printf(s, ",file_mode=%04o", mnt->file_mode & S_IRWXUGO);
446 if (mnt->flags & SMB_MOUNT_DMODE)
447 seq_printf(s, ",dir_mode=%04o", mnt->dir_mode & S_IRWXUGO);
448
449 if (strcmp(mnt->codepage.local_name, CONFIG_NLS_DEFAULT))
450 seq_printf(s, ",iocharset=%s", mnt->codepage.local_name);
451 if (strcmp(mnt->codepage.remote_name, SMB_NLS_REMOTE))
452 seq_printf(s, ",codepage=%s", mnt->codepage.remote_name);
453
454 if (mnt->ttl != SMB_TTL_DEFAULT)
455 seq_printf(s, ",ttl=%d", mnt->ttl);
456
457 return 0;
458}
459
460static void
461smb_unload_nls(struct smb_sb_info *server)
462{
463 if (server->remote_nls) {
464 unload_nls(server->remote_nls);
465 server->remote_nls = NULL;
466 }
467 if (server->local_nls) {
468 unload_nls(server->local_nls);
469 server->local_nls = NULL;
470 }
471}
472
473static void
474smb_put_super(struct super_block *sb)
475{
476 struct smb_sb_info *server = SMB_SB(sb);
477
478 smb_lock_server(server);
479 server->state = CONN_INVALID;
480 smbiod_unregister_server(server);
481
482 smb_close_socket(server);
483
484 if (server->conn_pid)
485 kill_proc(server->conn_pid, SIGTERM, 1);
486
Pekka Enbergd0633892006-01-14 13:21:13 -0800487 kfree(server->ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 smb_unload_nls(server);
489 sb->s_fs_info = NULL;
490 smb_unlock_server(server);
Pekka Enbergd0633892006-01-14 13:21:13 -0800491 kfree(server);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492}
493
494static int smb_fill_super(struct super_block *sb, void *raw_data, int silent)
495{
496 struct smb_sb_info *server;
497 struct smb_mount_data_kernel *mnt;
498 struct smb_mount_data *oldmnt;
499 struct inode *root_inode;
500 struct smb_fattr root;
501 int ver;
502 void *mem;
503
504 if (!raw_data)
505 goto out_no_data;
506
507 oldmnt = (struct smb_mount_data *) raw_data;
508 ver = oldmnt->version;
509 if (ver != SMB_MOUNT_OLDVERSION && cpu_to_be32(ver) != SMB_MOUNT_ASCII)
510 goto out_wrong_data;
511
512 sb->s_flags |= MS_NODIRATIME;
513 sb->s_blocksize = 1024; /* Eh... Is this correct? */
514 sb->s_blocksize_bits = 10;
515 sb->s_magic = SMB_SUPER_MAGIC;
516 sb->s_op = &smb_sops;
517 sb->s_time_gran = 100;
518
Pekka Enbergd0633892006-01-14 13:21:13 -0800519 server = kzalloc(sizeof(struct smb_sb_info), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (!server)
521 goto out_no_server;
522 sb->s_fs_info = server;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524 server->super_block = sb;
525 server->mnt = NULL;
526 server->sock_file = NULL;
527 init_waitqueue_head(&server->conn_wq);
528 init_MUTEX(&server->sem);
529 INIT_LIST_HEAD(&server->entry);
530 INIT_LIST_HEAD(&server->xmitq);
531 INIT_LIST_HEAD(&server->recvq);
532 server->conn_error = 0;
533 server->conn_pid = 0;
534 server->state = CONN_INVALID; /* no connection yet */
535 server->generation = 0;
536
537 /* Allocate the global temp buffer and some superblock helper structs */
538 /* FIXME: move these to the smb_sb_info struct */
539 VERBOSE("alloc chunk = %d\n", sizeof(struct smb_ops) +
540 sizeof(struct smb_mount_data_kernel));
Pekka Enbergd0633892006-01-14 13:21:13 -0800541 mem = kmalloc(sizeof(struct smb_ops) +
542 sizeof(struct smb_mount_data_kernel), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 if (!mem)
544 goto out_no_mem;
545
546 server->ops = mem;
547 smb_install_null_ops(server->ops);
548 server->mnt = mem + sizeof(struct smb_ops);
549
550 /* Setup NLS stuff */
551 server->remote_nls = NULL;
552 server->local_nls = NULL;
553
554 mnt = server->mnt;
555
556 memset(mnt, 0, sizeof(struct smb_mount_data_kernel));
557 strlcpy(mnt->codepage.local_name, CONFIG_NLS_DEFAULT,
558 SMB_NLS_MAXNAMELEN);
559 strlcpy(mnt->codepage.remote_name, SMB_NLS_REMOTE,
560 SMB_NLS_MAXNAMELEN);
561
562 mnt->ttl = SMB_TTL_DEFAULT;
563 if (ver == SMB_MOUNT_OLDVERSION) {
564 mnt->version = oldmnt->version;
565
566 SET_UID(mnt->uid, oldmnt->uid);
567 SET_GID(mnt->gid, oldmnt->gid);
568
569 mnt->file_mode = (oldmnt->file_mode & S_IRWXUGO) | S_IFREG;
570 mnt->dir_mode = (oldmnt->dir_mode & S_IRWXUGO) | S_IFDIR;
571
572 mnt->flags = (oldmnt->file_mode >> 9) | SMB_MOUNT_UID |
573 SMB_MOUNT_GID | SMB_MOUNT_FMODE | SMB_MOUNT_DMODE;
574 } else {
575 mnt->file_mode = S_IRWXU | S_IRGRP | S_IXGRP |
576 S_IROTH | S_IXOTH | S_IFREG;
577 mnt->dir_mode = S_IRWXU | S_IRGRP | S_IXGRP |
578 S_IROTH | S_IXOTH | S_IFDIR;
579 if (parse_options(mnt, raw_data))
580 goto out_bad_option;
581 }
582 mnt->mounted_uid = current->uid;
583 smb_setcodepage(server, &mnt->codepage);
584
585 /*
586 * Display the enabled options
587 * Note: smb_proc_getattr uses these in 2.4 (but was changed in 2.2)
588 */
589 if (mnt->flags & SMB_MOUNT_OLDATTR)
590 printk("SMBFS: Using core getattr (Win 95 speedup)\n");
591 else if (mnt->flags & SMB_MOUNT_DIRATTR)
592 printk("SMBFS: Using dir ff getattr\n");
593
594 if (smbiod_register_server(server) < 0) {
595 printk(KERN_ERR "smbfs: failed to start smbiod\n");
596 goto out_no_smbiod;
597 }
598
599 /*
600 * Keep the super block locked while we get the root inode.
601 */
602 smb_init_root_dirent(server, &root, sb);
603 root_inode = smb_iget(sb, &root);
604 if (!root_inode)
605 goto out_no_root;
606
607 sb->s_root = d_alloc_root(root_inode);
608 if (!sb->s_root)
609 goto out_no_root;
610
611 smb_new_dentry(sb->s_root);
612
613 return 0;
614
615out_no_root:
616 iput(root_inode);
617out_no_smbiod:
618 smb_unload_nls(server);
619out_bad_option:
Pekka Enbergd0633892006-01-14 13:21:13 -0800620 kfree(mem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621out_no_mem:
622 if (!server->mnt)
623 printk(KERN_ERR "smb_fill_super: allocation failure\n");
624 sb->s_fs_info = NULL;
Pekka Enbergd0633892006-01-14 13:21:13 -0800625 kfree(server);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 goto out_fail;
627out_wrong_data:
628 printk(KERN_ERR "smbfs: mount_data version %d is not supported\n", ver);
629 goto out_fail;
630out_no_data:
631 printk(KERN_ERR "smb_fill_super: missing data argument\n");
632out_fail:
633 return -EINVAL;
634out_no_server:
635 printk(KERN_ERR "smb_fill_super: cannot allocate struct smb_sb_info\n");
636 return -ENOMEM;
637}
638
639static int
David Howells726c3342006-06-23 02:02:58 -0700640smb_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641{
642 int result;
643
644 lock_kernel();
645
David Howells726c3342006-06-23 02:02:58 -0700646 result = smb_proc_dskattr(dentry, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
648 unlock_kernel();
649
650 buf->f_type = SMB_SUPER_MAGIC;
651 buf->f_namelen = SMB_MAXPATHLEN;
652 return result;
653}
654
655int smb_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
656{
657 int err = smb_revalidate_inode(dentry);
658 if (!err)
659 generic_fillattr(dentry->d_inode, stat);
660 return err;
661}
662
663int
664smb_notify_change(struct dentry *dentry, struct iattr *attr)
665{
666 struct inode *inode = dentry->d_inode;
667 struct smb_sb_info *server = server_from_dentry(dentry);
668 unsigned int mask = (S_IFREG | S_IFDIR | S_IRWXUGO);
669 int error, changed, refresh = 0;
670 struct smb_fattr fattr;
671
672 lock_kernel();
673
674 error = smb_revalidate_inode(dentry);
675 if (error)
676 goto out;
677
678 if ((error = inode_change_ok(inode, attr)) < 0)
679 goto out;
680
681 error = -EPERM;
682 if ((attr->ia_valid & ATTR_UID) && (attr->ia_uid != server->mnt->uid))
683 goto out;
684
685 if ((attr->ia_valid & ATTR_GID) && (attr->ia_uid != server->mnt->gid))
686 goto out;
687
688 if ((attr->ia_valid & ATTR_MODE) && (attr->ia_mode & ~mask))
689 goto out;
690
691 if ((attr->ia_valid & ATTR_SIZE) != 0) {
692 VERBOSE("changing %s/%s, old size=%ld, new size=%ld\n",
693 DENTRY_PATH(dentry),
694 (long) inode->i_size, (long) attr->ia_size);
695
OGAWA Hirofumi28fd1292006-01-08 01:02:14 -0800696 filemap_write_and_wait(inode->i_mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698 error = smb_open(dentry, O_WRONLY);
699 if (error)
700 goto out;
701 error = server->ops->truncate(inode, attr->ia_size);
702 if (error)
703 goto out;
704 error = vmtruncate(inode, attr->ia_size);
705 if (error)
706 goto out;
707 refresh = 1;
708 }
709
710 if (server->opt.capabilities & SMB_CAP_UNIX) {
711 /* For now we don't want to set the size with setattr_unix */
712 attr->ia_valid &= ~ATTR_SIZE;
713 /* FIXME: only call if we actually want to set something? */
714 error = smb_proc_setattr_unix(dentry, attr, 0, 0);
715 if (!error)
716 refresh = 1;
717
718 goto out;
719 }
720
721 /*
722 * Initialize the fattr and check for changed fields.
723 * Note: CTIME under SMB is creation time rather than
724 * change time, so we don't attempt to change it.
725 */
726 smb_get_inode_attr(inode, &fattr);
727
728 changed = 0;
729 if ((attr->ia_valid & ATTR_MTIME) != 0) {
730 fattr.f_mtime = attr->ia_mtime;
731 changed = 1;
732 }
733 if ((attr->ia_valid & ATTR_ATIME) != 0) {
734 fattr.f_atime = attr->ia_atime;
735 /* Earlier protocols don't have an access time */
736 if (server->opt.protocol >= SMB_PROTOCOL_LANMAN2)
737 changed = 1;
738 }
739 if (changed) {
740 error = smb_proc_settime(dentry, &fattr);
741 if (error)
742 goto out;
743 refresh = 1;
744 }
745
746 /*
747 * Check for mode changes ... we're extremely limited in
748 * what can be set for SMB servers: just the read-only bit.
749 */
750 if ((attr->ia_valid & ATTR_MODE) != 0) {
751 VERBOSE("%s/%s mode change, old=%x, new=%x\n",
752 DENTRY_PATH(dentry), fattr.f_mode, attr->ia_mode);
753 changed = 0;
754 if (attr->ia_mode & S_IWUSR) {
755 if (fattr.attr & aRONLY) {
756 fattr.attr &= ~aRONLY;
757 changed = 1;
758 }
759 } else {
760 if (!(fattr.attr & aRONLY)) {
761 fattr.attr |= aRONLY;
762 changed = 1;
763 }
764 }
765 if (changed) {
766 error = smb_proc_setattr(dentry, &fattr);
767 if (error)
768 goto out;
769 refresh = 1;
770 }
771 }
772 error = 0;
773
774out:
775 if (refresh)
776 smb_refresh_inode(dentry);
777 unlock_kernel();
778 return error;
779}
780
David Howells454e2392006-06-23 02:02:57 -0700781static int smb_get_sb(struct file_system_type *fs_type,
782 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783{
David Howells454e2392006-06-23 02:02:57 -0700784 return get_sb_nodev(fs_type, flags, data, smb_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785}
786
787static struct file_system_type smb_fs_type = {
788 .owner = THIS_MODULE,
789 .name = "smbfs",
790 .get_sb = smb_get_sb,
791 .kill_sb = kill_anon_super,
792 .fs_flags = FS_BINARY_MOUNTDATA,
793};
794
795static int __init init_smb_fs(void)
796{
797 int err;
798 DEBUG1("registering ...\n");
799
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 err = init_inodecache();
801 if (err)
802 goto out_inode;
803 err = smb_init_request_cache();
804 if (err)
805 goto out_request;
806 err = register_filesystem(&smb_fs_type);
807 if (err)
808 goto out;
809 return 0;
810out:
811 smb_destroy_request_cache();
812out_request:
813 destroy_inodecache();
814out_inode:
815 return err;
816}
817
818static void __exit exit_smb_fs(void)
819{
820 DEBUG1("unregistering ...\n");
821 unregister_filesystem(&smb_fs_type);
822 smb_destroy_request_cache();
823 destroy_inodecache();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824}
825
826module_init(init_smb_fs)
827module_exit(exit_smb_fs)
828MODULE_LICENSE("GPL");