blob: 02c6e62b72f80c031db4ec6d1d248e70a067168c [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,
69};
70
Arjan van de Ven754661f2007-02-12 00:55:38 -080071static const struct inode_operations befs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 .lookup = befs_lookup,
73};
74
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070075static const struct address_space_operations befs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 .readpage = befs_readpage,
77 .sync_page = block_sync_page,
78 .bmap = befs_bmap,
79};
80
Arjan van de Ven754661f2007-02-12 00:55:38 -080081static const struct inode_operations befs_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 .readlink = generic_readlink,
83 .follow_link = befs_follow_link,
84 .put_link = befs_put_link,
85};
86
87/*
88 * Called by generic_file_read() to read a page of data
89 *
90 * In turn, simply calls a generic block read function and
91 * passes it the address of befs_get_block, for mapping file
92 * positions to disk blocks.
93 */
94static int
95befs_readpage(struct file *file, struct page *page)
96{
97 return block_read_full_page(page, befs_get_block);
98}
99
100static sector_t
101befs_bmap(struct address_space *mapping, sector_t block)
102{
103 return generic_block_bmap(mapping, block, befs_get_block);
104}
105
106/*
107 * Generic function to map a file position (block) to a
108 * disk offset (passed back in bh_result).
109 *
110 * Used by many higher level functions.
111 *
112 * Calls befs_fblock2brun() in datastream.c to do the real work.
113 *
114 * -WD 10-26-01
115 */
116
117static int
118befs_get_block(struct inode *inode, sector_t block,
119 struct buffer_head *bh_result, int create)
120{
121 struct super_block *sb = inode->i_sb;
122 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
123 befs_block_run run = BAD_IADDR;
124 int res = 0;
125 ulong disk_off;
126
127 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
128 inode->i_ino, block);
129
130 if (block < 0) {
131 befs_error(sb, "befs_get_block() was asked for a block "
132 "number less than zero: block %ld in inode %lu",
133 block, inode->i_ino);
134 return -EIO;
135 }
136
137 if (create) {
138 befs_error(sb, "befs_get_block() was asked to write to "
139 "block %ld in inode %lu", block, inode->i_ino);
140 return -EPERM;
141 }
142
143 res = befs_fblock2brun(sb, ds, block, &run);
144 if (res != BEFS_OK) {
145 befs_error(sb,
146 "<--- befs_get_block() for inode %lu, block "
147 "%ld ERROR", inode->i_ino, block);
148 return -EFBIG;
149 }
150
151 disk_off = (ulong) iaddr2blockno(sb, &run);
152
153 map_bh(bh_result, inode->i_sb, disk_off);
154
155 befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, "
156 "disk address %lu", inode->i_ino, block, disk_off);
157
158 return 0;
159}
160
161static struct dentry *
162befs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
163{
164 struct inode *inode = NULL;
165 struct super_block *sb = dir->i_sb;
166 befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
167 befs_off_t offset;
168 int ret;
169 int utfnamelen;
170 char *utfname;
171 const char *name = dentry->d_name.name;
172
173 befs_debug(sb, "---> befs_lookup() "
174 "name %s inode %ld", dentry->d_name.name, dir->i_ino);
175
176 /* Convert to UTF-8 */
177 if (BEFS_SB(sb)->nls) {
178 ret =
179 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
180 if (ret < 0) {
181 befs_debug(sb, "<--- befs_lookup() ERROR");
182 return ERR_PTR(ret);
183 }
184 ret = befs_btree_find(sb, ds, utfname, &offset);
185 kfree(utfname);
186
187 } else {
188 ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset);
189 }
190
191 if (ret == BEFS_BT_NOT_FOUND) {
192 befs_debug(sb, "<--- befs_lookup() %s not found",
193 dentry->d_name.name);
194 return ERR_PTR(-ENOENT);
195
196 } else if (ret != BEFS_OK || offset == 0) {
197 befs_warning(sb, "<--- befs_lookup() Error");
198 return ERR_PTR(-ENODATA);
199 }
200
David Howells96eb5412008-02-07 00:15:31 -0800201 inode = befs_iget(dir->i_sb, (ino_t) offset);
202 if (IS_ERR(inode))
203 return ERR_CAST(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205 d_add(dentry, inode);
206
207 befs_debug(sb, "<--- befs_lookup()");
208
209 return NULL;
210}
211
212static int
213befs_readdir(struct file *filp, void *dirent, filldir_t filldir)
214{
Josef Sipek28f375f2006-12-08 02:36:52 -0800215 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 struct super_block *sb = inode->i_sb;
217 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
218 befs_off_t value;
219 int result;
220 size_t keysize;
221 unsigned char d_type;
222 char keybuf[BEFS_NAME_LEN + 1];
223 char *nlsname;
224 int nlsnamelen;
Josef Sipek28f375f2006-12-08 02:36:52 -0800225 const char *dirname = filp->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227 befs_debug(sb, "---> befs_readdir() "
228 "name %s, inode %ld, filp->f_pos %Ld",
229 dirname, inode->i_ino, filp->f_pos);
230
231 result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1,
232 keybuf, &keysize, &value);
233
234 if (result == BEFS_ERR) {
235 befs_debug(sb, "<--- befs_readdir() ERROR");
236 befs_error(sb, "IO error reading %s (inode %lu)",
237 dirname, inode->i_ino);
238 return -EIO;
239
240 } else if (result == BEFS_BT_END) {
241 befs_debug(sb, "<--- befs_readdir() END");
242 return 0;
243
244 } else if (result == BEFS_BT_EMPTY) {
245 befs_debug(sb, "<--- befs_readdir() Empty directory");
246 return 0;
247 }
248
249 d_type = DT_UNKNOWN;
250
251 /* Convert to NLS */
252 if (BEFS_SB(sb)->nls) {
253 result =
254 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
255 if (result < 0) {
256 befs_debug(sb, "<--- befs_readdir() ERROR");
257 return result;
258 }
259 result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos,
260 (ino_t) value, d_type);
261 kfree(nlsname);
262
263 } else {
264 result = filldir(dirent, keybuf, keysize, filp->f_pos,
265 (ino_t) value, d_type);
266 }
267
268 filp->f_pos++;
269
270 befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos);
271
272 return 0;
273}
274
275static struct inode *
276befs_alloc_inode(struct super_block *sb)
277{
278 struct befs_inode_info *bi;
279 bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep,
Christoph Lametere94b1762006-12-06 20:33:17 -0800280 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 if (!bi)
282 return NULL;
283 return &bi->vfs_inode;
284}
285
286static void
287befs_destroy_inode(struct inode *inode)
288{
289 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
290}
291
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700292static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
294 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
Christoph Lametera35afb82007-05-16 22:10:57 -0700295
296 inode_init_once(&bi->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
298
David Howells96eb5412008-02-07 00:15:31 -0800299static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300{
301 struct buffer_head *bh = NULL;
302 befs_inode *raw_inode = NULL;
303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 befs_sb_info *befs_sb = BEFS_SB(sb);
305 befs_inode_info *befs_ino = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800306 struct inode *inode;
307 long ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
David Howells96eb5412008-02-07 00:15:31 -0800309 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino);
310
311 inode = iget_locked(sb, ino);
312 if (IS_ERR(inode))
313 return inode;
314 if (!(inode->i_state & I_NEW))
315 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317 befs_ino = BEFS_I(inode);
318
319 /* convert from vfs's inode number to befs's inode number */
320 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
321
322 befs_debug(sb, " real inode number [%u, %hu, %hu]",
323 befs_ino->i_inode_num.allocation_group,
324 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
325
326 bh = befs_bread(sb, inode->i_ino);
327 if (!bh) {
328 befs_error(sb, "unable to read inode block - "
329 "inode = %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200330 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 }
332
333 raw_inode = (befs_inode *) bh->b_data;
334
335 befs_dump_inode(sb, raw_inode);
336
337 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
338 befs_error(sb, "Bad inode: %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200339 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 }
341
342 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
343
344 /*
345 * set uid and gid. But since current BeOS is single user OS, so
346 * you can change by "uid" or "gid" options.
347 */
348
349 inode->i_uid = befs_sb->mount_opts.use_uid ?
350 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid);
351 inode->i_gid = befs_sb->mount_opts.use_gid ?
352 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid);
353
354 inode->i_nlink = 1;
355
356 /*
357 * BEFS's time is 64 bits, but current VFS is 32 bits...
358 * BEFS don't have access time. Nor inode change time. VFS
359 * doesn't have creation time.
360 * Also, the lower 16 bits of the last_modified_time and
361 * create_time are just a counter to help ensure uniqueness
362 * for indexing purposes. (PFD, page 54)
363 */
364
365 inode->i_mtime.tv_sec =
366 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
367 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
368 inode->i_ctime = inode->i_mtime;
369 inode->i_atime = inode->i_mtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
371 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
372 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
373 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
374 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
375
376 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
377 inode->i_size = 0;
378 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
379 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
380 BEFS_SYMLINK_LEN);
381 } else {
382 int num_blks;
383
384 befs_ino->i_data.ds =
385 fsds_to_cpu(sb, raw_inode->data.datastream);
386
387 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
388 inode->i_blocks =
389 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
390 inode->i_size = befs_ino->i_data.ds.size;
391 }
392
393 inode->i_mapping->a_ops = &befs_aops;
394
395 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig2cf06912005-11-07 00:59:44 -0800396 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 } else if (S_ISDIR(inode->i_mode)) {
398 inode->i_op = &befs_dir_inode_operations;
399 inode->i_fop = &befs_dir_operations;
400 } else if (S_ISLNK(inode->i_mode)) {
401 inode->i_op = &befs_symlink_inode_operations;
402 } else {
403 befs_error(sb, "Inode %lu is not a regular file, "
404 "directory or symlink. THAT IS WRONG! BeFS has no "
405 "on disk special files", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200406 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 }
408
409 brelse(bh);
410 befs_debug(sb, "<--- befs_read_inode()");
David Howells96eb5412008-02-07 00:15:31 -0800411 unlock_new_inode(inode);
412 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Adrian Bunk04187262006-06-30 18:23:04 +0200414 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 brelse(bh);
416
Adrian Bunk04187262006-06-30 18:23:04 +0200417 unacquire_none:
David Howells96eb5412008-02-07 00:15:31 -0800418 iget_failed(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 befs_debug(sb, "<--- befs_read_inode() - Bad inode");
David Howells96eb5412008-02-07 00:15:31 -0800420 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421}
422
423/* Initialize the inode cache. Called at fs setup.
Paul Mundt20c2df82007-07-20 10:11:58 +0900424 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 * Taken from NFS implementation by Al Viro.
426 */
427static int
428befs_init_inodecache(void)
429{
430 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
431 sizeof (struct befs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800432 0, (SLAB_RECLAIM_ACCOUNT|
433 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900434 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 if (befs_inode_cachep == NULL) {
436 printk(KERN_ERR "befs_init_inodecache: "
437 "Couldn't initalize inode slabcache\n");
438 return -ENOMEM;
439 }
440
441 return 0;
442}
443
444/* Called at fs teardown.
445 *
446 * Taken from NFS implementation by Al Viro.
447 */
448static void
449befs_destroy_inodecache(void)
450{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700451 kmem_cache_destroy(befs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
453
454/*
455 * The inode of symbolic link is different to data stream.
456 * The data stream become link name. Unless the LONG_SYMLINK
457 * flag is set.
458 */
Linus Torvaldsdb873892005-08-20 13:20:01 -0700459static void *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460befs_follow_link(struct dentry *dentry, struct nameidata *nd)
461{
462 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
463 char *link;
464
465 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
466 struct super_block *sb = dentry->d_sb;
467 befs_data_stream *data = &befs_ino->i_data.ds;
468 befs_off_t len = data->size;
469
470 befs_debug(sb, "Follow long symlink");
471
472 link = kmalloc(len, GFP_NOFS);
473 if (!link) {
474 link = ERR_PTR(-ENOMEM);
475 } else if (befs_read_lsymlink(sb, data, link, len) != len) {
476 kfree(link);
477 befs_error(sb, "Failed to read entire long symlink");
478 link = ERR_PTR(-EIO);
479 }
480 } else {
481 link = befs_ino->i_data.symlink;
482 }
483
484 nd_set_link(nd, link);
Al Viro008b1502005-08-20 00:17:39 +0100485 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486}
487
Al Viro008b1502005-08-20 00:17:39 +0100488static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489{
490 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
491 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
Harvey Harrison63e34532008-04-29 00:58:44 -0700492 char *link = nd_get_link(nd);
493 if (!IS_ERR(link))
494 kfree(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 }
496}
497
498/*
499 * UTF-8 to NLS charset convert routine
500 *
501 *
502 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
503 * the nls tables directly
504 */
505
506static int
507befs_utf2nls(struct super_block *sb, const char *in,
508 int in_len, char **out, int *out_len)
509{
510 struct nls_table *nls = BEFS_SB(sb)->nls;
511 int i, o;
512 wchar_t uni;
513 int unilen, utflen;
514 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700515 /* The utf8->nls conversion won't make the final nls string bigger
516 * than the utf one, but if the string is pure ascii they'll have the
517 * same width and an extra char is needed to save the additional \0
518 */
519 int maxlen = in_len + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520
521 befs_debug(sb, "---> utf2nls()");
522
523 if (!nls) {
524 befs_error(sb, "befs_utf2nls called with no NLS table loaded");
525 return -EINVAL;
526 }
527
528 *out = result = kmalloc(maxlen, GFP_NOFS);
529 if (!*out) {
530 befs_error(sb, "befs_utf2nls() cannot allocate memory");
531 *out_len = 0;
532 return -ENOMEM;
533 }
534
535 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
536
537 /* convert from UTF-8 to Unicode */
538 utflen = utf8_mbtowc(&uni, &in[i], in_len - i);
539 if (utflen < 0) {
540 goto conv_err;
541 }
542
543 /* convert from Unicode to nls */
544 unilen = nls->uni2char(uni, &result[o], in_len - o);
545 if (unilen < 0) {
546 goto conv_err;
547 }
548 }
549 result[o] = '\0';
550 *out_len = o;
551
552 befs_debug(sb, "<--- utf2nls()");
553
554 return o;
555
556 conv_err:
557 befs_error(sb, "Name using character set %s contains a character that "
558 "cannot be converted to unicode.", nls->charset);
559 befs_debug(sb, "<--- utf2nls()");
560 kfree(result);
561 return -EILSEQ;
562}
563
564/**
565 * befs_nls2utf - Convert NLS string to utf8 encodeing
566 * @sb: Superblock
567 * @src: Input string buffer in NLS format
568 * @srclen: Length of input string in bytes
Alexey Dobriyan4de151d2006-03-22 00:13:35 +0100569 * @dest: The output string in UTF-8 format
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 * @destlen: Length of the output buffer
571 *
572 * Converts input string @src, which is in the format of the loaded NLS map,
573 * into a utf8 string.
574 *
575 * The destination string @dest is allocated by this function and the caller is
576 * responsible for freeing it with kfree()
577 *
578 * On return, *@destlen is the length of @dest in bytes.
579 *
580 * On success, the return value is the number of utf8 characters written to
581 * the output buffer @dest.
582 *
583 * On Failure, a negative number coresponding to the error code is returned.
584 */
585
586static int
587befs_nls2utf(struct super_block *sb, const char *in,
588 int in_len, char **out, int *out_len)
589{
590 struct nls_table *nls = BEFS_SB(sb)->nls;
591 int i, o;
592 wchar_t uni;
593 int unilen, utflen;
594 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700595 /* There're nls characters that will translate to 3-chars-wide UTF-8
596 * characters, a additional byte is needed to save the final \0
597 * in special cases */
598 int maxlen = (3 * in_len) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600 befs_debug(sb, "---> nls2utf()\n");
601
602 if (!nls) {
603 befs_error(sb, "befs_nls2utf called with no NLS table loaded.");
604 return -EINVAL;
605 }
606
607 *out = result = kmalloc(maxlen, GFP_NOFS);
608 if (!*out) {
609 befs_error(sb, "befs_nls2utf() cannot allocate memory");
610 *out_len = 0;
611 return -ENOMEM;
612 }
613
614 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
615
616 /* convert from nls to unicode */
617 unilen = nls->char2uni(&in[i], in_len - i, &uni);
618 if (unilen < 0) {
619 goto conv_err;
620 }
621
622 /* convert from unicode to UTF-8 */
623 utflen = utf8_wctomb(&result[o], uni, 3);
624 if (utflen <= 0) {
625 goto conv_err;
626 }
627 }
628
629 result[o] = '\0';
630 *out_len = o;
631
632 befs_debug(sb, "<--- nls2utf()");
633
634 return i;
635
636 conv_err:
637 befs_error(sb, "Name using charecter set %s contains a charecter that "
638 "cannot be converted to unicode.", nls->charset);
639 befs_debug(sb, "<--- nls2utf()");
640 kfree(result);
641 return -EILSEQ;
642}
643
644/**
645 * Use the
646 *
647 */
648enum {
649 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
650};
651
652static match_table_t befs_tokens = {
653 {Opt_uid, "uid=%d"},
654 {Opt_gid, "gid=%d"},
655 {Opt_charset, "iocharset=%s"},
656 {Opt_debug, "debug"},
657 {Opt_err, NULL}
658};
659
660static int
661parse_options(char *options, befs_mount_options * opts)
662{
663 char *p;
664 substring_t args[MAX_OPT_ARGS];
665 int option;
666
667 /* Initialize options */
668 opts->uid = 0;
669 opts->gid = 0;
670 opts->use_uid = 0;
671 opts->use_gid = 0;
672 opts->iocharset = NULL;
673 opts->debug = 0;
674
675 if (!options)
676 return 1;
677
678 while ((p = strsep(&options, ",")) != NULL) {
679 int token;
680 if (!*p)
681 continue;
682
683 token = match_token(p, befs_tokens, args);
684 switch (token) {
685 case Opt_uid:
686 if (match_int(&args[0], &option))
687 return 0;
688 if (option < 0) {
689 printk(KERN_ERR "BeFS: Invalid uid %d, "
690 "using default\n", option);
691 break;
692 }
693 opts->uid = option;
694 opts->use_uid = 1;
695 break;
696 case Opt_gid:
697 if (match_int(&args[0], &option))
698 return 0;
699 if (option < 0) {
700 printk(KERN_ERR "BeFS: Invalid gid %d, "
701 "using default\n", option);
702 break;
703 }
704 opts->gid = option;
705 opts->use_gid = 1;
706 break;
707 case Opt_charset:
708 kfree(opts->iocharset);
709 opts->iocharset = match_strdup(&args[0]);
710 if (!opts->iocharset) {
711 printk(KERN_ERR "BeFS: allocation failure for "
712 "iocharset string\n");
713 return 0;
714 }
715 break;
716 case Opt_debug:
717 opts->debug = 1;
718 break;
719 default:
720 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" "
721 "or missing value\n", p);
722 return 0;
723 }
724 }
725 return 1;
726}
727
728/* This function has the responsibiltiy of getting the
729 * filesystem ready for unmounting.
730 * Basicly, we free everything that we allocated in
731 * befs_read_inode
732 */
733static void
734befs_put_super(struct super_block *sb)
735{
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800736 kfree(BEFS_SB(sb)->mount_opts.iocharset);
737 BEFS_SB(sb)->mount_opts.iocharset = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
739 if (BEFS_SB(sb)->nls) {
740 unload_nls(BEFS_SB(sb)->nls);
741 BEFS_SB(sb)->nls = NULL;
742 }
743
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800744 kfree(sb->s_fs_info);
745 sb->s_fs_info = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 return;
747}
748
749/* Allocate private field of the superblock, fill it.
750 *
751 * Finish filling the public superblock fields
752 * Make the root directory
753 * Load a set of NLS translations if needed.
754 */
755static int
756befs_fill_super(struct super_block *sb, void *data, int silent)
757{
758 struct buffer_head *bh;
759 befs_sb_info *befs_sb;
760 befs_super_block *disk_sb;
761 struct inode *root;
David Howells96eb5412008-02-07 00:15:31 -0800762 long ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 const unsigned long sb_block = 0;
764 const off_t x86_sb_off = 512;
765
Miklos Szeredi552c3c62008-02-08 04:21:38 -0800766 save_mount_options(sb, data);
767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL);
769 if (sb->s_fs_info == NULL) {
770 printk(KERN_ERR
771 "BeFS(%s): Unable to allocate memory for private "
772 "portion of superblock. Bailing.\n", sb->s_id);
Adrian Bunk04187262006-06-30 18:23:04 +0200773 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 }
775 befs_sb = BEFS_SB(sb);
776 memset(befs_sb, 0, sizeof(befs_sb_info));
777
778 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
779 befs_error(sb, "cannot parse mount options");
Adrian Bunk04187262006-06-30 18:23:04 +0200780 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 }
782
783 befs_debug(sb, "---> befs_fill_super()");
784
785#ifndef CONFIG_BEFS_RW
786 if (!(sb->s_flags & MS_RDONLY)) {
787 befs_warning(sb,
788 "No write support. Marking filesystem read-only");
789 sb->s_flags |= MS_RDONLY;
790 }
791#endif /* CONFIG_BEFS_RW */
792
793 /*
794 * Set dummy blocksize to read super block.
795 * Will be set to real fs blocksize later.
796 *
797 * Linux 2.4.10 and later refuse to read blocks smaller than
798 * the hardsect size for the device. But we also need to read at
799 * least 1k to get the second 512 bytes of the volume.
800 * -WD 10-26-01
801 */
802 sb_min_blocksize(sb, 1024);
803
804 if (!(bh = sb_bread(sb, sb_block))) {
805 befs_error(sb, "unable to read superblock");
Adrian Bunk04187262006-06-30 18:23:04 +0200806 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 }
808
809 /* account for offset of super block on x86 */
810 disk_sb = (befs_super_block *) bh->b_data;
811 if ((le32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1) ||
812 (be32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1)) {
813 befs_debug(sb, "Using PPC superblock location");
814 } else {
815 befs_debug(sb, "Using x86 superblock location");
816 disk_sb =
817 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
818 }
819
820 if (befs_load_sb(sb, disk_sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200821 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822
823 befs_dump_super_block(sb, disk_sb);
824
825 brelse(bh);
826
827 if (befs_check_sb(sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200828 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
830 if( befs_sb->num_blocks > ~((sector_t)0) ) {
831 befs_error(sb, "blocks count: %Lu "
832 "is larger than the host can use",
833 befs_sb->num_blocks);
Adrian Bunk04187262006-06-30 18:23:04 +0200834 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 }
836
837 /*
838 * set up enough so that it can read an inode
839 * Fill in kernel superblock fields from private sb
840 */
841 sb->s_magic = BEFS_SUPER_MAGIC;
842 /* Set real blocksize of fs */
843 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
844 sb->s_op = (struct super_operations *) &befs_sops;
David Howells96eb5412008-02-07 00:15:31 -0800845 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
846 if (IS_ERR(root)) {
847 ret = PTR_ERR(root);
848 goto unacquire_priv_sbp;
849 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 sb->s_root = d_alloc_root(root);
851 if (!sb->s_root) {
852 iput(root);
853 befs_error(sb, "get root inode failed");
Adrian Bunk04187262006-06-30 18:23:04 +0200854 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 }
856
857 /* load nls library */
858 if (befs_sb->mount_opts.iocharset) {
859 befs_debug(sb, "Loading nls: %s",
860 befs_sb->mount_opts.iocharset);
861 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
862 if (!befs_sb->nls) {
863 befs_warning(sb, "Cannot load nls %s"
864 " loading default nls",
865 befs_sb->mount_opts.iocharset);
866 befs_sb->nls = load_nls_default();
867 }
868 /* load default nls if none is specified in mount options */
869 } else {
870 befs_debug(sb, "Loading default nls");
871 befs_sb->nls = load_nls_default();
872 }
873
874 return 0;
875/*****************/
Adrian Bunk04187262006-06-30 18:23:04 +0200876 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 brelse(bh);
878
Adrian Bunk04187262006-06-30 18:23:04 +0200879 unacquire_priv_sbp:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 kfree(sb->s_fs_info);
881
Adrian Bunk04187262006-06-30 18:23:04 +0200882 unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 sb->s_fs_info = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800884 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885}
886
887static int
888befs_remount(struct super_block *sb, int *flags, char *data)
889{
890 if (!(*flags & MS_RDONLY))
891 return -EINVAL;
892 return 0;
893}
894
895static int
David Howells726c3342006-06-23 02:02:58 -0700896befs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897{
David Howells726c3342006-06-23 02:02:58 -0700898 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899
900 befs_debug(sb, "---> befs_statfs()");
901
902 buf->f_type = BEFS_SUPER_MAGIC;
903 buf->f_bsize = sb->s_blocksize;
904 buf->f_blocks = BEFS_SB(sb)->num_blocks;
905 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
906 buf->f_bavail = buf->f_bfree;
907 buf->f_files = 0; /* UNKNOWN */
908 buf->f_ffree = 0; /* UNKNOWN */
909 buf->f_namelen = BEFS_NAME_LEN;
910
911 befs_debug(sb, "<--- befs_statfs()");
912
913 return 0;
914}
915
David Howells454e2392006-06-23 02:02:57 -0700916static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name,
David Howells454e2392006-06-23 02:02:57 -0700918 void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919{
David Howells454e2392006-06-23 02:02:57 -0700920 return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super,
921 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922}
923
924static struct file_system_type befs_fs_type = {
925 .owner = THIS_MODULE,
926 .name = "befs",
927 .get_sb = befs_get_sb,
928 .kill_sb = kill_block_super,
929 .fs_flags = FS_REQUIRES_DEV,
930};
931
932static int __init
933init_befs_fs(void)
934{
935 int err;
936
937 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION);
938
939 err = befs_init_inodecache();
940 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200941 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
943 err = register_filesystem(&befs_fs_type);
944 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200945 goto unacquire_inodecache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946
947 return 0;
948
Adrian Bunk04187262006-06-30 18:23:04 +0200949unacquire_inodecache:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 befs_destroy_inodecache();
951
Adrian Bunk04187262006-06-30 18:23:04 +0200952unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 return err;
954}
955
956static void __exit
957exit_befs_fs(void)
958{
959 befs_destroy_inodecache();
960
961 unregister_filesystem(&befs_fs_type);
962}
963
964/*
965Macros that typecheck the init and exit functions,
966ensures that they are called at init and cleanup,
967and eliminates warnings about unused functions.
968*/
969module_init(init_befs_fs)
970module_exit(exit_befs_fs)