blob: b6dfee37c7b71776201aa320ac6e450e00290cd7 [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
287static void
288befs_destroy_inode(struct inode *inode)
289{
290 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
291}
292
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700293static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
295 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
Christoph Lametera35afb82007-05-16 22:10:57 -0700296
297 inode_init_once(&bi->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
David Howells96eb5412008-02-07 00:15:31 -0800300static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
302 struct buffer_head *bh = NULL;
303 befs_inode *raw_inode = NULL;
304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 befs_sb_info *befs_sb = BEFS_SB(sb);
306 befs_inode_info *befs_ino = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800307 struct inode *inode;
308 long ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
David Howells96eb5412008-02-07 00:15:31 -0800310 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino);
311
312 inode = iget_locked(sb, ino);
313 if (IS_ERR(inode))
314 return inode;
315 if (!(inode->i_state & I_NEW))
316 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
318 befs_ino = BEFS_I(inode);
319
320 /* convert from vfs's inode number to befs's inode number */
321 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
322
323 befs_debug(sb, " real inode number [%u, %hu, %hu]",
324 befs_ino->i_inode_num.allocation_group,
325 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
326
327 bh = befs_bread(sb, inode->i_ino);
328 if (!bh) {
329 befs_error(sb, "unable to read inode block - "
330 "inode = %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200331 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 }
333
334 raw_inode = (befs_inode *) bh->b_data;
335
336 befs_dump_inode(sb, raw_inode);
337
338 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
339 befs_error(sb, "Bad inode: %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200340 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 }
342
343 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
344
345 /*
346 * set uid and gid. But since current BeOS is single user OS, so
347 * you can change by "uid" or "gid" options.
348 */
349
350 inode->i_uid = befs_sb->mount_opts.use_uid ?
351 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid);
352 inode->i_gid = befs_sb->mount_opts.use_gid ?
353 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid);
354
355 inode->i_nlink = 1;
356
357 /*
358 * BEFS's time is 64 bits, but current VFS is 32 bits...
359 * BEFS don't have access time. Nor inode change time. VFS
360 * doesn't have creation time.
361 * Also, the lower 16 bits of the last_modified_time and
362 * create_time are just a counter to help ensure uniqueness
363 * for indexing purposes. (PFD, page 54)
364 */
365
366 inode->i_mtime.tv_sec =
367 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
368 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
369 inode->i_ctime = inode->i_mtime;
370 inode->i_atime = inode->i_mtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
373 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
374 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
375 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
376
377 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
378 inode->i_size = 0;
379 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
380 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
381 BEFS_SYMLINK_LEN);
382 } else {
383 int num_blks;
384
385 befs_ino->i_data.ds =
386 fsds_to_cpu(sb, raw_inode->data.datastream);
387
388 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
389 inode->i_blocks =
390 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
391 inode->i_size = befs_ino->i_data.ds.size;
392 }
393
394 inode->i_mapping->a_ops = &befs_aops;
395
396 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig2cf06912005-11-07 00:59:44 -0800397 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 } else if (S_ISDIR(inode->i_mode)) {
399 inode->i_op = &befs_dir_inode_operations;
400 inode->i_fop = &befs_dir_operations;
401 } else if (S_ISLNK(inode->i_mode)) {
402 inode->i_op = &befs_symlink_inode_operations;
403 } else {
404 befs_error(sb, "Inode %lu is not a regular file, "
405 "directory or symlink. THAT IS WRONG! BeFS has no "
406 "on disk special files", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200407 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 }
409
410 brelse(bh);
411 befs_debug(sb, "<--- befs_read_inode()");
David Howells96eb5412008-02-07 00:15:31 -0800412 unlock_new_inode(inode);
413 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414
Adrian Bunk04187262006-06-30 18:23:04 +0200415 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 brelse(bh);
417
Adrian Bunk04187262006-06-30 18:23:04 +0200418 unacquire_none:
David Howells96eb5412008-02-07 00:15:31 -0800419 iget_failed(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 befs_debug(sb, "<--- befs_read_inode() - Bad inode");
David Howells96eb5412008-02-07 00:15:31 -0800421 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422}
423
424/* Initialize the inode cache. Called at fs setup.
Paul Mundt20c2df82007-07-20 10:11:58 +0900425 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 * Taken from NFS implementation by Al Viro.
427 */
428static int
429befs_init_inodecache(void)
430{
431 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
432 sizeof (struct befs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800433 0, (SLAB_RECLAIM_ACCOUNT|
434 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900435 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 if (befs_inode_cachep == NULL) {
437 printk(KERN_ERR "befs_init_inodecache: "
438 "Couldn't initalize inode slabcache\n");
439 return -ENOMEM;
440 }
441
442 return 0;
443}
444
445/* Called at fs teardown.
446 *
447 * Taken from NFS implementation by Al Viro.
448 */
449static void
450befs_destroy_inodecache(void)
451{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700452 kmem_cache_destroy(befs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453}
454
455/*
456 * The inode of symbolic link is different to data stream.
457 * The data stream become link name. Unless the LONG_SYMLINK
458 * flag is set.
459 */
Linus Torvaldsdb873892005-08-20 13:20:01 -0700460static void *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461befs_follow_link(struct dentry *dentry, struct nameidata *nd)
462{
463 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
464 char *link;
465
466 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
467 struct super_block *sb = dentry->d_sb;
468 befs_data_stream *data = &befs_ino->i_data.ds;
469 befs_off_t len = data->size;
470
471 befs_debug(sb, "Follow long symlink");
472
473 link = kmalloc(len, GFP_NOFS);
474 if (!link) {
475 link = ERR_PTR(-ENOMEM);
476 } else if (befs_read_lsymlink(sb, data, link, len) != len) {
477 kfree(link);
478 befs_error(sb, "Failed to read entire long symlink");
479 link = ERR_PTR(-EIO);
480 }
481 } else {
482 link = befs_ino->i_data.symlink;
483 }
484
485 nd_set_link(nd, link);
Al Viro008b1502005-08-20 00:17:39 +0100486 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487}
488
Al Viro008b1502005-08-20 00:17:39 +0100489static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
491 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
492 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
Harvey Harrison63e34532008-04-29 00:58:44 -0700493 char *link = nd_get_link(nd);
494 if (!IS_ERR(link))
495 kfree(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 }
497}
498
499/*
500 * UTF-8 to NLS charset convert routine
501 *
502 *
503 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
504 * the nls tables directly
505 */
506
507static int
508befs_utf2nls(struct super_block *sb, const char *in,
509 int in_len, char **out, int *out_len)
510{
511 struct nls_table *nls = BEFS_SB(sb)->nls;
512 int i, o;
513 wchar_t uni;
514 int unilen, utflen;
515 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700516 /* The utf8->nls conversion won't make the final nls string bigger
517 * than the utf one, but if the string is pure ascii they'll have the
518 * same width and an extra char is needed to save the additional \0
519 */
520 int maxlen = in_len + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
522 befs_debug(sb, "---> utf2nls()");
523
524 if (!nls) {
525 befs_error(sb, "befs_utf2nls called with no NLS table loaded");
526 return -EINVAL;
527 }
528
529 *out = result = kmalloc(maxlen, GFP_NOFS);
530 if (!*out) {
531 befs_error(sb, "befs_utf2nls() cannot allocate memory");
532 *out_len = 0;
533 return -ENOMEM;
534 }
535
536 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
537
538 /* convert from UTF-8 to Unicode */
539 utflen = utf8_mbtowc(&uni, &in[i], in_len - i);
540 if (utflen < 0) {
541 goto conv_err;
542 }
543
544 /* convert from Unicode to nls */
545 unilen = nls->uni2char(uni, &result[o], in_len - o);
546 if (unilen < 0) {
547 goto conv_err;
548 }
549 }
550 result[o] = '\0';
551 *out_len = o;
552
553 befs_debug(sb, "<--- utf2nls()");
554
555 return o;
556
557 conv_err:
558 befs_error(sb, "Name using character set %s contains a character that "
559 "cannot be converted to unicode.", nls->charset);
560 befs_debug(sb, "<--- utf2nls()");
561 kfree(result);
562 return -EILSEQ;
563}
564
565/**
566 * befs_nls2utf - Convert NLS string to utf8 encodeing
567 * @sb: Superblock
568 * @src: Input string buffer in NLS format
569 * @srclen: Length of input string in bytes
Alexey Dobriyan4de151d2006-03-22 00:13:35 +0100570 * @dest: The output string in UTF-8 format
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 * @destlen: Length of the output buffer
572 *
573 * Converts input string @src, which is in the format of the loaded NLS map,
574 * into a utf8 string.
575 *
576 * The destination string @dest is allocated by this function and the caller is
577 * responsible for freeing it with kfree()
578 *
579 * On return, *@destlen is the length of @dest in bytes.
580 *
581 * On success, the return value is the number of utf8 characters written to
582 * the output buffer @dest.
583 *
584 * On Failure, a negative number coresponding to the error code is returned.
585 */
586
587static int
588befs_nls2utf(struct super_block *sb, const char *in,
589 int in_len, char **out, int *out_len)
590{
591 struct nls_table *nls = BEFS_SB(sb)->nls;
592 int i, o;
593 wchar_t uni;
594 int unilen, utflen;
595 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700596 /* There're nls characters that will translate to 3-chars-wide UTF-8
597 * characters, a additional byte is needed to save the final \0
598 * in special cases */
599 int maxlen = (3 * in_len) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
601 befs_debug(sb, "---> nls2utf()\n");
602
603 if (!nls) {
604 befs_error(sb, "befs_nls2utf called with no NLS table loaded.");
605 return -EINVAL;
606 }
607
608 *out = result = kmalloc(maxlen, GFP_NOFS);
609 if (!*out) {
610 befs_error(sb, "befs_nls2utf() cannot allocate memory");
611 *out_len = 0;
612 return -ENOMEM;
613 }
614
615 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
616
617 /* convert from nls to unicode */
618 unilen = nls->char2uni(&in[i], in_len - i, &uni);
619 if (unilen < 0) {
620 goto conv_err;
621 }
622
623 /* convert from unicode to UTF-8 */
624 utflen = utf8_wctomb(&result[o], uni, 3);
625 if (utflen <= 0) {
626 goto conv_err;
627 }
628 }
629
630 result[o] = '\0';
631 *out_len = o;
632
633 befs_debug(sb, "<--- nls2utf()");
634
635 return i;
636
637 conv_err:
638 befs_error(sb, "Name using charecter set %s contains a charecter that "
639 "cannot be converted to unicode.", nls->charset);
640 befs_debug(sb, "<--- nls2utf()");
641 kfree(result);
642 return -EILSEQ;
643}
644
645/**
646 * Use the
647 *
648 */
649enum {
650 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
651};
652
Steven Whitehousea447c092008-10-13 10:46:57 +0100653static const match_table_t befs_tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 {Opt_uid, "uid=%d"},
655 {Opt_gid, "gid=%d"},
656 {Opt_charset, "iocharset=%s"},
657 {Opt_debug, "debug"},
658 {Opt_err, NULL}
659};
660
661static int
662parse_options(char *options, befs_mount_options * opts)
663{
664 char *p;
665 substring_t args[MAX_OPT_ARGS];
666 int option;
667
668 /* Initialize options */
669 opts->uid = 0;
670 opts->gid = 0;
671 opts->use_uid = 0;
672 opts->use_gid = 0;
673 opts->iocharset = NULL;
674 opts->debug = 0;
675
676 if (!options)
677 return 1;
678
679 while ((p = strsep(&options, ",")) != NULL) {
680 int token;
681 if (!*p)
682 continue;
683
684 token = match_token(p, befs_tokens, args);
685 switch (token) {
686 case Opt_uid:
687 if (match_int(&args[0], &option))
688 return 0;
689 if (option < 0) {
690 printk(KERN_ERR "BeFS: Invalid uid %d, "
691 "using default\n", option);
692 break;
693 }
694 opts->uid = option;
695 opts->use_uid = 1;
696 break;
697 case Opt_gid:
698 if (match_int(&args[0], &option))
699 return 0;
700 if (option < 0) {
701 printk(KERN_ERR "BeFS: Invalid gid %d, "
702 "using default\n", option);
703 break;
704 }
705 opts->gid = option;
706 opts->use_gid = 1;
707 break;
708 case Opt_charset:
709 kfree(opts->iocharset);
710 opts->iocharset = match_strdup(&args[0]);
711 if (!opts->iocharset) {
712 printk(KERN_ERR "BeFS: allocation failure for "
713 "iocharset string\n");
714 return 0;
715 }
716 break;
717 case Opt_debug:
718 opts->debug = 1;
719 break;
720 default:
721 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" "
722 "or missing value\n", p);
723 return 0;
724 }
725 }
726 return 1;
727}
728
729/* This function has the responsibiltiy of getting the
730 * filesystem ready for unmounting.
731 * Basicly, we free everything that we allocated in
732 * befs_read_inode
733 */
734static void
735befs_put_super(struct super_block *sb)
736{
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800737 kfree(BEFS_SB(sb)->mount_opts.iocharset);
738 BEFS_SB(sb)->mount_opts.iocharset = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
740 if (BEFS_SB(sb)->nls) {
741 unload_nls(BEFS_SB(sb)->nls);
742 BEFS_SB(sb)->nls = NULL;
743 }
744
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800745 kfree(sb->s_fs_info);
746 sb->s_fs_info = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 return;
748}
749
750/* Allocate private field of the superblock, fill it.
751 *
752 * Finish filling the public superblock fields
753 * Make the root directory
754 * Load a set of NLS translations if needed.
755 */
756static int
757befs_fill_super(struct super_block *sb, void *data, int silent)
758{
759 struct buffer_head *bh;
760 befs_sb_info *befs_sb;
761 befs_super_block *disk_sb;
762 struct inode *root;
David Howells96eb5412008-02-07 00:15:31 -0800763 long ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 const unsigned long sb_block = 0;
765 const off_t x86_sb_off = 512;
766
Miklos Szeredi552c3c62008-02-08 04:21:38 -0800767 save_mount_options(sb, data);
768
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL);
770 if (sb->s_fs_info == NULL) {
771 printk(KERN_ERR
772 "BeFS(%s): Unable to allocate memory for private "
773 "portion of superblock. Bailing.\n", sb->s_id);
Adrian Bunk04187262006-06-30 18:23:04 +0200774 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 }
776 befs_sb = BEFS_SB(sb);
777 memset(befs_sb, 0, sizeof(befs_sb_info));
778
779 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
780 befs_error(sb, "cannot parse mount options");
Adrian Bunk04187262006-06-30 18:23:04 +0200781 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 }
783
784 befs_debug(sb, "---> befs_fill_super()");
785
786#ifndef CONFIG_BEFS_RW
787 if (!(sb->s_flags & MS_RDONLY)) {
788 befs_warning(sb,
789 "No write support. Marking filesystem read-only");
790 sb->s_flags |= MS_RDONLY;
791 }
792#endif /* CONFIG_BEFS_RW */
793
794 /*
795 * Set dummy blocksize to read super block.
796 * Will be set to real fs blocksize later.
797 *
798 * Linux 2.4.10 and later refuse to read blocks smaller than
799 * the hardsect size for the device. But we also need to read at
800 * least 1k to get the second 512 bytes of the volume.
801 * -WD 10-26-01
802 */
803 sb_min_blocksize(sb, 1024);
804
805 if (!(bh = sb_bread(sb, sb_block))) {
806 befs_error(sb, "unable to read superblock");
Adrian Bunk04187262006-06-30 18:23:04 +0200807 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 }
809
810 /* account for offset of super block on x86 */
811 disk_sb = (befs_super_block *) bh->b_data;
Harvey Harrison152b95a2008-10-15 22:04:03 -0700812 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
813 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 befs_debug(sb, "Using PPC superblock location");
815 } else {
816 befs_debug(sb, "Using x86 superblock location");
817 disk_sb =
818 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
819 }
820
821 if (befs_load_sb(sb, disk_sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200822 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
824 befs_dump_super_block(sb, disk_sb);
825
826 brelse(bh);
827
828 if (befs_check_sb(sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200829 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
831 if( befs_sb->num_blocks > ~((sector_t)0) ) {
832 befs_error(sb, "blocks count: %Lu "
833 "is larger than the host can use",
834 befs_sb->num_blocks);
Adrian Bunk04187262006-06-30 18:23:04 +0200835 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 }
837
838 /*
839 * set up enough so that it can read an inode
840 * Fill in kernel superblock fields from private sb
841 */
842 sb->s_magic = BEFS_SUPER_MAGIC;
843 /* Set real blocksize of fs */
844 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
845 sb->s_op = (struct super_operations *) &befs_sops;
David Howells96eb5412008-02-07 00:15:31 -0800846 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
847 if (IS_ERR(root)) {
848 ret = PTR_ERR(root);
849 goto unacquire_priv_sbp;
850 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 sb->s_root = d_alloc_root(root);
852 if (!sb->s_root) {
853 iput(root);
854 befs_error(sb, "get root inode failed");
Adrian Bunk04187262006-06-30 18:23:04 +0200855 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 }
857
858 /* load nls library */
859 if (befs_sb->mount_opts.iocharset) {
860 befs_debug(sb, "Loading nls: %s",
861 befs_sb->mount_opts.iocharset);
862 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
863 if (!befs_sb->nls) {
864 befs_warning(sb, "Cannot load nls %s"
865 " loading default nls",
866 befs_sb->mount_opts.iocharset);
867 befs_sb->nls = load_nls_default();
868 }
869 /* load default nls if none is specified in mount options */
870 } else {
871 befs_debug(sb, "Loading default nls");
872 befs_sb->nls = load_nls_default();
873 }
874
875 return 0;
876/*****************/
Adrian Bunk04187262006-06-30 18:23:04 +0200877 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 brelse(bh);
879
Adrian Bunk04187262006-06-30 18:23:04 +0200880 unacquire_priv_sbp:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 kfree(sb->s_fs_info);
882
Adrian Bunk04187262006-06-30 18:23:04 +0200883 unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 sb->s_fs_info = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800885 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886}
887
888static int
889befs_remount(struct super_block *sb, int *flags, char *data)
890{
891 if (!(*flags & MS_RDONLY))
892 return -EINVAL;
893 return 0;
894}
895
896static int
David Howells726c3342006-06-23 02:02:58 -0700897befs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898{
David Howells726c3342006-06-23 02:02:58 -0700899 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
901 befs_debug(sb, "---> befs_statfs()");
902
903 buf->f_type = BEFS_SUPER_MAGIC;
904 buf->f_bsize = sb->s_blocksize;
905 buf->f_blocks = BEFS_SB(sb)->num_blocks;
906 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
907 buf->f_bavail = buf->f_bfree;
908 buf->f_files = 0; /* UNKNOWN */
909 buf->f_ffree = 0; /* UNKNOWN */
910 buf->f_namelen = BEFS_NAME_LEN;
911
912 befs_debug(sb, "<--- befs_statfs()");
913
914 return 0;
915}
916
David Howells454e2392006-06-23 02:02:57 -0700917static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name,
David Howells454e2392006-06-23 02:02:57 -0700919 void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920{
David Howells454e2392006-06-23 02:02:57 -0700921 return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super,
922 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923}
924
925static struct file_system_type befs_fs_type = {
926 .owner = THIS_MODULE,
927 .name = "befs",
928 .get_sb = befs_get_sb,
929 .kill_sb = kill_block_super,
930 .fs_flags = FS_REQUIRES_DEV,
931};
932
933static int __init
934init_befs_fs(void)
935{
936 int err;
937
938 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION);
939
940 err = befs_init_inodecache();
941 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200942 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
944 err = register_filesystem(&befs_fs_type);
945 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200946 goto unacquire_inodecache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
948 return 0;
949
Adrian Bunk04187262006-06-30 18:23:04 +0200950unacquire_inodecache:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 befs_destroy_inodecache();
952
Adrian Bunk04187262006-06-30 18:23:04 +0200953unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 return err;
955}
956
957static void __exit
958exit_befs_fs(void)
959{
960 befs_destroy_inodecache();
961
962 unregister_filesystem(&befs_fs_type);
963}
964
965/*
966Macros that typecheck the init and exit functions,
967ensures that they are called at init and cleanup,
968and eliminates warnings about unused functions.
969*/
970module_init(init_befs_fs)
971module_exit(exit_befs_fs)