blob: b1d0c794747b7537dbade4895eccae70aa78cc5e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/befs/linuxvfs.c
3 *
4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
5 *
6 */
7
8#include <linux/module.h>
9#include <linux/slab.h>
10#include <linux/fs.h>
11#include <linux/errno.h>
12#include <linux/stat.h>
13#include <linux/nls.h>
14#include <linux/buffer_head.h>
15#include <linux/vfs.h>
16#include <linux/parser.h>
17#include <linux/namei.h>
18
19#include "befs.h"
20#include "btree.h"
21#include "inode.h"
22#include "datastream.h"
23#include "super.h"
24#include "io.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
27MODULE_AUTHOR("Will Dyson");
28MODULE_LICENSE("GPL");
29
30/* The units the vfs expects inode->i_blocks to be in */
31#define VFS_BLOCK_SIZE 512
32
33static int befs_readdir(struct file *, void *, filldir_t);
34static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int);
35static int befs_readpage(struct file *file, struct page *page);
36static sector_t befs_bmap(struct address_space *mapping, sector_t block);
37static struct dentry *befs_lookup(struct inode *, struct dentry *, struct nameidata *);
David Howells96eb5412008-02-07 00:15:31 -080038static struct inode *befs_iget(struct super_block *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039static struct inode *befs_alloc_inode(struct super_block *sb);
40static void befs_destroy_inode(struct inode *inode);
41static int befs_init_inodecache(void);
42static void befs_destroy_inodecache(void);
Al Viro008b1502005-08-20 00:17:39 +010043static void *befs_follow_link(struct dentry *, struct nameidata *);
44static void befs_put_link(struct dentry *, struct nameidata *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
46 char **out, int *out_len);
47static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
48 char **out, int *out_len);
49static void befs_put_super(struct super_block *);
50static int befs_remount(struct super_block *, int *, char *);
David Howells726c3342006-06-23 02:02:58 -070051static int befs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052static int parse_options(char *, befs_mount_options *);
53
54static const struct super_operations befs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 .alloc_inode = befs_alloc_inode, /* allocate a new inode */
56 .destroy_inode = befs_destroy_inode, /* deallocate an inode */
57 .put_super = befs_put_super, /* uninit super */
58 .statfs = befs_statfs, /* statfs */
59 .remount_fs = befs_remount,
Miklos Szeredi552c3c62008-02-08 04:21:38 -080060 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -070061};
62
63/* slab cache for befs_inode_info objects */
Christoph Lametere18b8902006-12-06 20:33:20 -080064static struct kmem_cache *befs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080066static const struct file_operations befs_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 .read = generic_read_dir,
68 .readdir = befs_readdir,
Al Viro59af1582008-08-24 07:24:41 -040069 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -070070};
71
Arjan van de Ven754661f2007-02-12 00:55:38 -080072static const struct inode_operations befs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 .lookup = befs_lookup,
74};
75
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070076static const struct address_space_operations befs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 .readpage = befs_readpage,
78 .sync_page = block_sync_page,
79 .bmap = befs_bmap,
80};
81
Arjan van de Ven754661f2007-02-12 00:55:38 -080082static const struct inode_operations befs_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 .readlink = generic_readlink,
84 .follow_link = befs_follow_link,
85 .put_link = befs_put_link,
86};
87
88/*
89 * Called by generic_file_read() to read a page of data
90 *
91 * In turn, simply calls a generic block read function and
92 * passes it the address of befs_get_block, for mapping file
93 * positions to disk blocks.
94 */
95static int
96befs_readpage(struct file *file, struct page *page)
97{
98 return block_read_full_page(page, befs_get_block);
99}
100
101static sector_t
102befs_bmap(struct address_space *mapping, sector_t block)
103{
104 return generic_block_bmap(mapping, block, befs_get_block);
105}
106
107/*
108 * Generic function to map a file position (block) to a
109 * disk offset (passed back in bh_result).
110 *
111 * Used by many higher level functions.
112 *
113 * Calls befs_fblock2brun() in datastream.c to do the real work.
114 *
115 * -WD 10-26-01
116 */
117
118static int
119befs_get_block(struct inode *inode, sector_t block,
120 struct buffer_head *bh_result, int create)
121{
122 struct super_block *sb = inode->i_sb;
123 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
124 befs_block_run run = BAD_IADDR;
125 int res = 0;
126 ulong disk_off;
127
128 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
129 inode->i_ino, block);
130
131 if (block < 0) {
132 befs_error(sb, "befs_get_block() was asked for a block "
133 "number less than zero: block %ld in inode %lu",
134 block, inode->i_ino);
135 return -EIO;
136 }
137
138 if (create) {
139 befs_error(sb, "befs_get_block() was asked to write to "
140 "block %ld in inode %lu", block, inode->i_ino);
141 return -EPERM;
142 }
143
144 res = befs_fblock2brun(sb, ds, block, &run);
145 if (res != BEFS_OK) {
146 befs_error(sb,
147 "<--- befs_get_block() for inode %lu, block "
148 "%ld ERROR", inode->i_ino, block);
149 return -EFBIG;
150 }
151
152 disk_off = (ulong) iaddr2blockno(sb, &run);
153
154 map_bh(bh_result, inode->i_sb, disk_off);
155
156 befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, "
157 "disk address %lu", inode->i_ino, block, disk_off);
158
159 return 0;
160}
161
162static struct dentry *
163befs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
164{
165 struct inode *inode = NULL;
166 struct super_block *sb = dir->i_sb;
167 befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
168 befs_off_t offset;
169 int ret;
170 int utfnamelen;
171 char *utfname;
172 const char *name = dentry->d_name.name;
173
174 befs_debug(sb, "---> befs_lookup() "
175 "name %s inode %ld", dentry->d_name.name, dir->i_ino);
176
177 /* Convert to UTF-8 */
178 if (BEFS_SB(sb)->nls) {
179 ret =
180 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
181 if (ret < 0) {
182 befs_debug(sb, "<--- befs_lookup() ERROR");
183 return ERR_PTR(ret);
184 }
185 ret = befs_btree_find(sb, ds, utfname, &offset);
186 kfree(utfname);
187
188 } else {
189 ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset);
190 }
191
192 if (ret == BEFS_BT_NOT_FOUND) {
193 befs_debug(sb, "<--- befs_lookup() %s not found",
194 dentry->d_name.name);
195 return ERR_PTR(-ENOENT);
196
197 } else if (ret != BEFS_OK || offset == 0) {
198 befs_warning(sb, "<--- befs_lookup() Error");
199 return ERR_PTR(-ENODATA);
200 }
201
David Howells96eb5412008-02-07 00:15:31 -0800202 inode = befs_iget(dir->i_sb, (ino_t) offset);
203 if (IS_ERR(inode))
204 return ERR_CAST(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 d_add(dentry, inode);
207
208 befs_debug(sb, "<--- befs_lookup()");
209
210 return NULL;
211}
212
213static int
214befs_readdir(struct file *filp, void *dirent, filldir_t filldir)
215{
Josef Sipek28f375f2006-12-08 02:36:52 -0800216 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 struct super_block *sb = inode->i_sb;
218 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
219 befs_off_t value;
220 int result;
221 size_t keysize;
222 unsigned char d_type;
223 char keybuf[BEFS_NAME_LEN + 1];
224 char *nlsname;
225 int nlsnamelen;
Josef Sipek28f375f2006-12-08 02:36:52 -0800226 const char *dirname = filp->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 befs_debug(sb, "---> befs_readdir() "
229 "name %s, inode %ld, filp->f_pos %Ld",
230 dirname, inode->i_ino, filp->f_pos);
231
232 result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1,
233 keybuf, &keysize, &value);
234
235 if (result == BEFS_ERR) {
236 befs_debug(sb, "<--- befs_readdir() ERROR");
237 befs_error(sb, "IO error reading %s (inode %lu)",
238 dirname, inode->i_ino);
239 return -EIO;
240
241 } else if (result == BEFS_BT_END) {
242 befs_debug(sb, "<--- befs_readdir() END");
243 return 0;
244
245 } else if (result == BEFS_BT_EMPTY) {
246 befs_debug(sb, "<--- befs_readdir() Empty directory");
247 return 0;
248 }
249
250 d_type = DT_UNKNOWN;
251
252 /* Convert to NLS */
253 if (BEFS_SB(sb)->nls) {
254 result =
255 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
256 if (result < 0) {
257 befs_debug(sb, "<--- befs_readdir() ERROR");
258 return result;
259 }
260 result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos,
261 (ino_t) value, d_type);
262 kfree(nlsname);
263
264 } else {
265 result = filldir(dirent, keybuf, keysize, filp->f_pos,
266 (ino_t) value, d_type);
267 }
268
269 filp->f_pos++;
270
271 befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos);
272
273 return 0;
274}
275
276static struct inode *
277befs_alloc_inode(struct super_block *sb)
278{
279 struct befs_inode_info *bi;
280 bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep,
Christoph Lametere94b1762006-12-06 20:33:17 -0800281 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 if (!bi)
283 return NULL;
284 return &bi->vfs_inode;
285}
286
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100287static void befs_i_callback(struct rcu_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100289 struct inode *inode = container_of(head, struct inode, i_rcu);
290 INIT_LIST_HEAD(&inode->i_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
292}
293
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100294static void befs_destroy_inode(struct inode *inode)
295{
296 call_rcu(&inode->i_rcu, befs_i_callback);
297}
298
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700299static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
301 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
Christoph Lametera35afb82007-05-16 22:10:57 -0700302
303 inode_init_once(&bi->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304}
305
David Howells96eb5412008-02-07 00:15:31 -0800306static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307{
308 struct buffer_head *bh = NULL;
309 befs_inode *raw_inode = NULL;
310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 befs_sb_info *befs_sb = BEFS_SB(sb);
312 befs_inode_info *befs_ino = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800313 struct inode *inode;
314 long ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
David Howells96eb5412008-02-07 00:15:31 -0800316 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino);
317
318 inode = iget_locked(sb, ino);
319 if (IS_ERR(inode))
320 return inode;
321 if (!(inode->i_state & I_NEW))
322 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
324 befs_ino = BEFS_I(inode);
325
326 /* convert from vfs's inode number to befs's inode number */
327 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
328
329 befs_debug(sb, " real inode number [%u, %hu, %hu]",
330 befs_ino->i_inode_num.allocation_group,
331 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
332
333 bh = befs_bread(sb, inode->i_ino);
334 if (!bh) {
335 befs_error(sb, "unable to read inode block - "
336 "inode = %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200337 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 }
339
340 raw_inode = (befs_inode *) bh->b_data;
341
342 befs_dump_inode(sb, raw_inode);
343
344 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
345 befs_error(sb, "Bad inode: %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200346 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 }
348
349 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
350
351 /*
352 * set uid and gid. But since current BeOS is single user OS, so
353 * you can change by "uid" or "gid" options.
354 */
355
356 inode->i_uid = befs_sb->mount_opts.use_uid ?
357 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid);
358 inode->i_gid = befs_sb->mount_opts.use_gid ?
359 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid);
360
361 inode->i_nlink = 1;
362
363 /*
364 * BEFS's time is 64 bits, but current VFS is 32 bits...
365 * BEFS don't have access time. Nor inode change time. VFS
366 * doesn't have creation time.
367 * Also, the lower 16 bits of the last_modified_time and
368 * create_time are just a counter to help ensure uniqueness
369 * for indexing purposes. (PFD, page 54)
370 */
371
372 inode->i_mtime.tv_sec =
373 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
374 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
375 inode->i_ctime = inode->i_mtime;
376 inode->i_atime = inode->i_mtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
379 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
380 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
381 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
382
383 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
384 inode->i_size = 0;
385 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
386 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
Duane Griffin7df5fa02008-12-19 20:47:18 +0000387 BEFS_SYMLINK_LEN - 1);
388 befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 } else {
390 int num_blks;
391
392 befs_ino->i_data.ds =
Jesper Juhle0e3d322011-01-12 17:00:26 -0800393 fsds_to_cpu(sb, &raw_inode->data.datastream);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
396 inode->i_blocks =
397 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
398 inode->i_size = befs_ino->i_data.ds.size;
399 }
400
401 inode->i_mapping->a_ops = &befs_aops;
402
403 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig2cf06912005-11-07 00:59:44 -0800404 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 } else if (S_ISDIR(inode->i_mode)) {
406 inode->i_op = &befs_dir_inode_operations;
407 inode->i_fop = &befs_dir_operations;
408 } else if (S_ISLNK(inode->i_mode)) {
409 inode->i_op = &befs_symlink_inode_operations;
410 } else {
411 befs_error(sb, "Inode %lu is not a regular file, "
412 "directory or symlink. THAT IS WRONG! BeFS has no "
413 "on disk special files", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200414 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 }
416
417 brelse(bh);
418 befs_debug(sb, "<--- befs_read_inode()");
David Howells96eb5412008-02-07 00:15:31 -0800419 unlock_new_inode(inode);
420 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Adrian Bunk04187262006-06-30 18:23:04 +0200422 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 brelse(bh);
424
Adrian Bunk04187262006-06-30 18:23:04 +0200425 unacquire_none:
David Howells96eb5412008-02-07 00:15:31 -0800426 iget_failed(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 befs_debug(sb, "<--- befs_read_inode() - Bad inode");
David Howells96eb5412008-02-07 00:15:31 -0800428 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429}
430
431/* Initialize the inode cache. Called at fs setup.
Paul Mundt20c2df82007-07-20 10:11:58 +0900432 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 * Taken from NFS implementation by Al Viro.
434 */
435static int
436befs_init_inodecache(void)
437{
438 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
439 sizeof (struct befs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800440 0, (SLAB_RECLAIM_ACCOUNT|
441 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900442 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 if (befs_inode_cachep == NULL) {
444 printk(KERN_ERR "befs_init_inodecache: "
Uwe Kleine-König421f91d2010-06-11 12:17:00 +0200445 "Couldn't initialize inode slabcache\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 return -ENOMEM;
447 }
448
449 return 0;
450}
451
452/* Called at fs teardown.
453 *
454 * Taken from NFS implementation by Al Viro.
455 */
456static void
457befs_destroy_inodecache(void)
458{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700459 kmem_cache_destroy(befs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460}
461
462/*
463 * The inode of symbolic link is different to data stream.
464 * The data stream become link name. Unless the LONG_SYMLINK
465 * flag is set.
466 */
Linus Torvaldsdb873892005-08-20 13:20:01 -0700467static void *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468befs_follow_link(struct dentry *dentry, struct nameidata *nd)
469{
470 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
471 char *link;
472
473 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
474 struct super_block *sb = dentry->d_sb;
475 befs_data_stream *data = &befs_ino->i_data.ds;
476 befs_off_t len = data->size;
477
478 befs_debug(sb, "Follow long symlink");
479
480 link = kmalloc(len, GFP_NOFS);
481 if (!link) {
482 link = ERR_PTR(-ENOMEM);
483 } else if (befs_read_lsymlink(sb, data, link, len) != len) {
484 kfree(link);
485 befs_error(sb, "Failed to read entire long symlink");
486 link = ERR_PTR(-EIO);
Duane Griffin7df5fa02008-12-19 20:47:18 +0000487 } else {
488 link[len - 1] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 }
490 } else {
491 link = befs_ino->i_data.symlink;
492 }
493
494 nd_set_link(nd, link);
Al Viro008b1502005-08-20 00:17:39 +0100495 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496}
497
Al Viro008b1502005-08-20 00:17:39 +0100498static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499{
500 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
501 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
Harvey Harrison63e34532008-04-29 00:58:44 -0700502 char *link = nd_get_link(nd);
503 if (!IS_ERR(link))
504 kfree(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 }
506}
507
508/*
509 * UTF-8 to NLS charset convert routine
510 *
511 *
512 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
513 * the nls tables directly
514 */
515
516static int
517befs_utf2nls(struct super_block *sb, const char *in,
518 int in_len, char **out, int *out_len)
519{
520 struct nls_table *nls = BEFS_SB(sb)->nls;
521 int i, o;
Alan Stern74675a52009-04-30 10:08:18 -0400522 unicode_t uni;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 int unilen, utflen;
524 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700525 /* The utf8->nls conversion won't make the final nls string bigger
526 * than the utf one, but if the string is pure ascii they'll have the
527 * same width and an extra char is needed to save the additional \0
528 */
529 int maxlen = in_len + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 befs_debug(sb, "---> utf2nls()");
532
533 if (!nls) {
534 befs_error(sb, "befs_utf2nls called with no NLS table loaded");
535 return -EINVAL;
536 }
537
538 *out = result = kmalloc(maxlen, GFP_NOFS);
539 if (!*out) {
540 befs_error(sb, "befs_utf2nls() cannot allocate memory");
541 *out_len = 0;
542 return -ENOMEM;
543 }
544
545 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
546
547 /* convert from UTF-8 to Unicode */
Alan Stern74675a52009-04-30 10:08:18 -0400548 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
549 if (utflen < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
552 /* convert from Unicode to nls */
Alan Stern74675a52009-04-30 10:08:18 -0400553 if (uni > MAX_WCHAR_T)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 goto conv_err;
Alan Stern74675a52009-04-30 10:08:18 -0400555 unilen = nls->uni2char(uni, &result[o], in_len - o);
556 if (unilen < 0)
557 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 }
559 result[o] = '\0';
560 *out_len = o;
561
562 befs_debug(sb, "<--- utf2nls()");
563
564 return o;
565
566 conv_err:
567 befs_error(sb, "Name using character set %s contains a character that "
568 "cannot be converted to unicode.", nls->charset);
569 befs_debug(sb, "<--- utf2nls()");
570 kfree(result);
571 return -EILSEQ;
572}
573
574/**
575 * befs_nls2utf - Convert NLS string to utf8 encodeing
576 * @sb: Superblock
577 * @src: Input string buffer in NLS format
578 * @srclen: Length of input string in bytes
Alexey Dobriyan4de151d2006-03-22 00:13:35 +0100579 * @dest: The output string in UTF-8 format
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 * @destlen: Length of the output buffer
581 *
582 * Converts input string @src, which is in the format of the loaded NLS map,
583 * into a utf8 string.
584 *
585 * The destination string @dest is allocated by this function and the caller is
586 * responsible for freeing it with kfree()
587 *
588 * On return, *@destlen is the length of @dest in bytes.
589 *
590 * On success, the return value is the number of utf8 characters written to
591 * the output buffer @dest.
592 *
593 * On Failure, a negative number coresponding to the error code is returned.
594 */
595
596static int
597befs_nls2utf(struct super_block *sb, const char *in,
598 int in_len, char **out, int *out_len)
599{
600 struct nls_table *nls = BEFS_SB(sb)->nls;
601 int i, o;
602 wchar_t uni;
603 int unilen, utflen;
604 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700605 /* There're nls characters that will translate to 3-chars-wide UTF-8
606 * characters, a additional byte is needed to save the final \0
607 * in special cases */
608 int maxlen = (3 * in_len) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610 befs_debug(sb, "---> nls2utf()\n");
611
612 if (!nls) {
613 befs_error(sb, "befs_nls2utf called with no NLS table loaded.");
614 return -EINVAL;
615 }
616
617 *out = result = kmalloc(maxlen, GFP_NOFS);
618 if (!*out) {
619 befs_error(sb, "befs_nls2utf() cannot allocate memory");
620 *out_len = 0;
621 return -ENOMEM;
622 }
623
624 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
625
626 /* convert from nls to unicode */
627 unilen = nls->char2uni(&in[i], in_len - i, &uni);
Alan Stern74675a52009-04-30 10:08:18 -0400628 if (unilen < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
631 /* convert from unicode to UTF-8 */
Alan Stern74675a52009-04-30 10:08:18 -0400632 utflen = utf32_to_utf8(uni, &result[o], 3);
633 if (utflen <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 }
636
637 result[o] = '\0';
638 *out_len = o;
639
640 befs_debug(sb, "<--- nls2utf()");
641
642 return i;
643
644 conv_err:
645 befs_error(sb, "Name using charecter set %s contains a charecter that "
646 "cannot be converted to unicode.", nls->charset);
647 befs_debug(sb, "<--- nls2utf()");
648 kfree(result);
649 return -EILSEQ;
650}
651
652/**
653 * Use the
654 *
655 */
656enum {
657 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
658};
659
Steven Whitehousea447c092008-10-13 10:46:57 +0100660static const match_table_t befs_tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 {Opt_uid, "uid=%d"},
662 {Opt_gid, "gid=%d"},
663 {Opt_charset, "iocharset=%s"},
664 {Opt_debug, "debug"},
665 {Opt_err, NULL}
666};
667
668static int
669parse_options(char *options, befs_mount_options * opts)
670{
671 char *p;
672 substring_t args[MAX_OPT_ARGS];
673 int option;
674
675 /* Initialize options */
676 opts->uid = 0;
677 opts->gid = 0;
678 opts->use_uid = 0;
679 opts->use_gid = 0;
680 opts->iocharset = NULL;
681 opts->debug = 0;
682
683 if (!options)
684 return 1;
685
686 while ((p = strsep(&options, ",")) != NULL) {
687 int token;
688 if (!*p)
689 continue;
690
691 token = match_token(p, befs_tokens, args);
692 switch (token) {
693 case Opt_uid:
694 if (match_int(&args[0], &option))
695 return 0;
696 if (option < 0) {
697 printk(KERN_ERR "BeFS: Invalid uid %d, "
698 "using default\n", option);
699 break;
700 }
701 opts->uid = option;
702 opts->use_uid = 1;
703 break;
704 case Opt_gid:
705 if (match_int(&args[0], &option))
706 return 0;
707 if (option < 0) {
708 printk(KERN_ERR "BeFS: Invalid gid %d, "
709 "using default\n", option);
710 break;
711 }
712 opts->gid = option;
713 opts->use_gid = 1;
714 break;
715 case Opt_charset:
716 kfree(opts->iocharset);
717 opts->iocharset = match_strdup(&args[0]);
718 if (!opts->iocharset) {
719 printk(KERN_ERR "BeFS: allocation failure for "
720 "iocharset string\n");
721 return 0;
722 }
723 break;
724 case Opt_debug:
725 opts->debug = 1;
726 break;
727 default:
728 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" "
729 "or missing value\n", p);
730 return 0;
731 }
732 }
733 return 1;
734}
735
736/* This function has the responsibiltiy of getting the
737 * filesystem ready for unmounting.
738 * Basicly, we free everything that we allocated in
739 * befs_read_inode
740 */
741static void
742befs_put_super(struct super_block *sb)
743{
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800744 kfree(BEFS_SB(sb)->mount_opts.iocharset);
745 BEFS_SB(sb)->mount_opts.iocharset = NULL;
Thomas Gleixner6d729e42009-08-16 21:05:08 +0000746 unload_nls(BEFS_SB(sb)->nls);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800747 kfree(sb->s_fs_info);
748 sb->s_fs_info = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749}
750
751/* Allocate private field of the superblock, fill it.
752 *
753 * Finish filling the public superblock fields
754 * Make the root directory
755 * Load a set of NLS translations if needed.
756 */
757static int
758befs_fill_super(struct super_block *sb, void *data, int silent)
759{
760 struct buffer_head *bh;
761 befs_sb_info *befs_sb;
762 befs_super_block *disk_sb;
763 struct inode *root;
David Howells96eb5412008-02-07 00:15:31 -0800764 long ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 const unsigned long sb_block = 0;
766 const off_t x86_sb_off = 512;
767
Miklos Szeredi552c3c62008-02-08 04:21:38 -0800768 save_mount_options(sb, data);
769
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL);
771 if (sb->s_fs_info == NULL) {
772 printk(KERN_ERR
773 "BeFS(%s): Unable to allocate memory for private "
774 "portion of superblock. Bailing.\n", sb->s_id);
Adrian Bunk04187262006-06-30 18:23:04 +0200775 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 }
777 befs_sb = BEFS_SB(sb);
778 memset(befs_sb, 0, sizeof(befs_sb_info));
779
780 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
781 befs_error(sb, "cannot parse mount options");
Adrian Bunk04187262006-06-30 18:23:04 +0200782 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 }
784
785 befs_debug(sb, "---> befs_fill_super()");
786
787#ifndef CONFIG_BEFS_RW
788 if (!(sb->s_flags & MS_RDONLY)) {
789 befs_warning(sb,
790 "No write support. Marking filesystem read-only");
791 sb->s_flags |= MS_RDONLY;
792 }
793#endif /* CONFIG_BEFS_RW */
794
795 /*
796 * Set dummy blocksize to read super block.
797 * Will be set to real fs blocksize later.
798 *
799 * Linux 2.4.10 and later refuse to read blocks smaller than
800 * the hardsect size for the device. But we also need to read at
801 * least 1k to get the second 512 bytes of the volume.
802 * -WD 10-26-01
803 */
804 sb_min_blocksize(sb, 1024);
805
806 if (!(bh = sb_bread(sb, sb_block))) {
807 befs_error(sb, "unable to read superblock");
Adrian Bunk04187262006-06-30 18:23:04 +0200808 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 }
810
811 /* account for offset of super block on x86 */
812 disk_sb = (befs_super_block *) bh->b_data;
Harvey Harrison152b95a2008-10-15 22:04:03 -0700813 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
814 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 befs_debug(sb, "Using PPC superblock location");
816 } else {
817 befs_debug(sb, "Using x86 superblock location");
818 disk_sb =
819 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
820 }
821
822 if (befs_load_sb(sb, disk_sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200823 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
825 befs_dump_super_block(sb, disk_sb);
826
827 brelse(bh);
828
829 if (befs_check_sb(sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200830 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832 if( befs_sb->num_blocks > ~((sector_t)0) ) {
833 befs_error(sb, "blocks count: %Lu "
834 "is larger than the host can use",
835 befs_sb->num_blocks);
Adrian Bunk04187262006-06-30 18:23:04 +0200836 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 }
838
839 /*
840 * set up enough so that it can read an inode
841 * Fill in kernel superblock fields from private sb
842 */
843 sb->s_magic = BEFS_SUPER_MAGIC;
844 /* Set real blocksize of fs */
845 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700846 sb->s_op = &befs_sops;
David Howells96eb5412008-02-07 00:15:31 -0800847 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
848 if (IS_ERR(root)) {
849 ret = PTR_ERR(root);
850 goto unacquire_priv_sbp;
851 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 sb->s_root = d_alloc_root(root);
853 if (!sb->s_root) {
854 iput(root);
855 befs_error(sb, "get root inode failed");
Adrian Bunk04187262006-06-30 18:23:04 +0200856 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 }
858
859 /* load nls library */
860 if (befs_sb->mount_opts.iocharset) {
861 befs_debug(sb, "Loading nls: %s",
862 befs_sb->mount_opts.iocharset);
863 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
864 if (!befs_sb->nls) {
865 befs_warning(sb, "Cannot load nls %s"
866 " loading default nls",
867 befs_sb->mount_opts.iocharset);
868 befs_sb->nls = load_nls_default();
869 }
870 /* load default nls if none is specified in mount options */
871 } else {
872 befs_debug(sb, "Loading default nls");
873 befs_sb->nls = load_nls_default();
874 }
875
876 return 0;
877/*****************/
Adrian Bunk04187262006-06-30 18:23:04 +0200878 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 brelse(bh);
880
Adrian Bunk04187262006-06-30 18:23:04 +0200881 unacquire_priv_sbp:
Al Viro8dd5ca52010-01-28 22:11:38 -0500882 kfree(befs_sb->mount_opts.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 kfree(sb->s_fs_info);
884
Adrian Bunk04187262006-06-30 18:23:04 +0200885 unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 sb->s_fs_info = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800887 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888}
889
890static int
891befs_remount(struct super_block *sb, int *flags, char *data)
892{
893 if (!(*flags & MS_RDONLY))
894 return -EINVAL;
895 return 0;
896}
897
898static int
David Howells726c3342006-06-23 02:02:58 -0700899befs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900{
David Howells726c3342006-06-23 02:02:58 -0700901 struct super_block *sb = dentry->d_sb;
Coly Li85872462009-04-02 16:59:32 -0700902 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
904 befs_debug(sb, "---> befs_statfs()");
905
906 buf->f_type = BEFS_SUPER_MAGIC;
907 buf->f_bsize = sb->s_blocksize;
908 buf->f_blocks = BEFS_SB(sb)->num_blocks;
909 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
910 buf->f_bavail = buf->f_bfree;
911 buf->f_files = 0; /* UNKNOWN */
912 buf->f_ffree = 0; /* UNKNOWN */
Coly Li85872462009-04-02 16:59:32 -0700913 buf->f_fsid.val[0] = (u32)id;
914 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 buf->f_namelen = BEFS_NAME_LEN;
916
917 befs_debug(sb, "<--- befs_statfs()");
918
919 return 0;
920}
921
Al Viro152a0832010-07-25 00:46:55 +0400922static struct dentry *
923befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
924 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925{
Al Viro152a0832010-07-25 00:46:55 +0400926 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927}
928
929static struct file_system_type befs_fs_type = {
930 .owner = THIS_MODULE,
931 .name = "befs",
Al Viro152a0832010-07-25 00:46:55 +0400932 .mount = befs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 .kill_sb = kill_block_super,
934 .fs_flags = FS_REQUIRES_DEV,
935};
936
937static int __init
938init_befs_fs(void)
939{
940 int err;
941
942 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION);
943
944 err = befs_init_inodecache();
945 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200946 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
948 err = register_filesystem(&befs_fs_type);
949 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200950 goto unacquire_inodecache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951
952 return 0;
953
Adrian Bunk04187262006-06-30 18:23:04 +0200954unacquire_inodecache:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 befs_destroy_inodecache();
956
Adrian Bunk04187262006-06-30 18:23:04 +0200957unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 return err;
959}
960
961static void __exit
962exit_befs_fs(void)
963{
964 befs_destroy_inodecache();
965
966 unregister_filesystem(&befs_fs_type);
967}
968
969/*
970Macros that typecheck the init and exit functions,
971ensures that they are called at init and cleanup,
972and eliminates warnings about unused functions.
973*/
974module_init(init_befs_fs)
975module_exit(exit_befs_fs)