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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"
25#include "endian.h"
26
27MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
28MODULE_AUTHOR("Will Dyson");
29MODULE_LICENSE("GPL");
30
31/* The units the vfs expects inode->i_blocks to be in */
32#define VFS_BLOCK_SIZE 512
33
34static int befs_readdir(struct file *, void *, filldir_t);
35static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int);
36static int befs_readpage(struct file *file, struct page *page);
37static sector_t befs_bmap(struct address_space *mapping, sector_t block);
38static struct dentry *befs_lookup(struct inode *, struct dentry *, struct nameidata *);
39static void befs_read_inode(struct inode *ino);
40static struct inode *befs_alloc_inode(struct super_block *sb);
41static void befs_destroy_inode(struct inode *inode);
42static int befs_init_inodecache(void);
43static void befs_destroy_inodecache(void);
Al Viro008b1502005-08-20 00:17:39 +010044static void *befs_follow_link(struct dentry *, struct nameidata *);
45static void befs_put_link(struct dentry *, struct nameidata *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
47 char **out, int *out_len);
48static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
49 char **out, int *out_len);
50static void befs_put_super(struct super_block *);
51static int befs_remount(struct super_block *, int *, char *);
David Howells726c3342006-06-23 02:02:58 -070052static int befs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053static int parse_options(char *, befs_mount_options *);
54
55static const struct super_operations befs_sops = {
56 .read_inode = befs_read_inode, /* initialize & read inode */
57 .alloc_inode = befs_alloc_inode, /* allocate a new inode */
58 .destroy_inode = befs_destroy_inode, /* deallocate an inode */
59 .put_super = befs_put_super, /* uninit super */
60 .statfs = befs_statfs, /* statfs */
61 .remount_fs = befs_remount,
62};
63
64/* slab cache for befs_inode_info objects */
65static kmem_cache_t *befs_inode_cachep;
66
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080067static const struct file_operations befs_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 .read = generic_read_dir,
69 .readdir = befs_readdir,
70};
71
72static struct inode_operations befs_dir_inode_operations = {
73 .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
82static struct inode_operations befs_symlink_inode_operations = {
83 .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
202 inode = iget(dir->i_sb, (ino_t) offset);
203 if (!inode)
204 return ERR_PTR(-EACCES);
205
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{
216 struct inode *inode = filp->f_dentry->d_inode;
217 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;
226 const char *dirname = filp->f_dentry->d_name.name;
227
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,
281 SLAB_KERNEL);
282 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
293static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
294{
295 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
296
297 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
298 SLAB_CTOR_CONSTRUCTOR) {
299 inode_init_once(&bi->vfs_inode);
300 }
301}
302
303static void
304befs_read_inode(struct inode *inode)
305{
306 struct buffer_head *bh = NULL;
307 befs_inode *raw_inode = NULL;
308
309 struct super_block *sb = inode->i_sb;
310 befs_sb_info *befs_sb = BEFS_SB(sb);
311 befs_inode_info *befs_ino = NULL;
312
313 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", inode->i_ino);
314
315 befs_ino = BEFS_I(inode);
316
317 /* convert from vfs's inode number to befs's inode number */
318 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
319
320 befs_debug(sb, " real inode number [%u, %hu, %hu]",
321 befs_ino->i_inode_num.allocation_group,
322 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
323
324 bh = befs_bread(sb, inode->i_ino);
325 if (!bh) {
326 befs_error(sb, "unable to read inode block - "
327 "inode = %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200328 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 }
330
331 raw_inode = (befs_inode *) bh->b_data;
332
333 befs_dump_inode(sb, raw_inode);
334
335 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
336 befs_error(sb, "Bad inode: %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200337 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 }
339
340 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
341
342 /*
343 * set uid and gid. But since current BeOS is single user OS, so
344 * you can change by "uid" or "gid" options.
345 */
346
347 inode->i_uid = befs_sb->mount_opts.use_uid ?
348 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid);
349 inode->i_gid = befs_sb->mount_opts.use_gid ?
350 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid);
351
352 inode->i_nlink = 1;
353
354 /*
355 * BEFS's time is 64 bits, but current VFS is 32 bits...
356 * BEFS don't have access time. Nor inode change time. VFS
357 * doesn't have creation time.
358 * Also, the lower 16 bits of the last_modified_time and
359 * create_time are just a counter to help ensure uniqueness
360 * for indexing purposes. (PFD, page 54)
361 */
362
363 inode->i_mtime.tv_sec =
364 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
365 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
366 inode->i_ctime = inode->i_mtime;
367 inode->i_atime = inode->i_mtime;
368 inode->i_blksize = befs_sb->block_size;
369
370 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
371 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
372 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
373 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
374
375 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
376 inode->i_size = 0;
377 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
378 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
379 BEFS_SYMLINK_LEN);
380 } else {
381 int num_blks;
382
383 befs_ino->i_data.ds =
384 fsds_to_cpu(sb, raw_inode->data.datastream);
385
386 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
387 inode->i_blocks =
388 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
389 inode->i_size = befs_ino->i_data.ds.size;
390 }
391
392 inode->i_mapping->a_ops = &befs_aops;
393
394 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig2cf06912005-11-07 00:59:44 -0800395 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 } else if (S_ISDIR(inode->i_mode)) {
397 inode->i_op = &befs_dir_inode_operations;
398 inode->i_fop = &befs_dir_operations;
399 } else if (S_ISLNK(inode->i_mode)) {
400 inode->i_op = &befs_symlink_inode_operations;
401 } else {
402 befs_error(sb, "Inode %lu is not a regular file, "
403 "directory or symlink. THAT IS WRONG! BeFS has no "
404 "on disk special files", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200405 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 }
407
408 brelse(bh);
409 befs_debug(sb, "<--- befs_read_inode()");
410 return;
411
Adrian Bunk04187262006-06-30 18:23:04 +0200412 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 brelse(bh);
414
Adrian Bunk04187262006-06-30 18:23:04 +0200415 unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 make_bad_inode(inode);
417 befs_debug(sb, "<--- befs_read_inode() - Bad inode");
418 return;
419}
420
421/* Initialize the inode cache. Called at fs setup.
422 *
423 * Taken from NFS implementation by Al Viro.
424 */
425static int
426befs_init_inodecache(void)
427{
428 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
429 sizeof (struct befs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800430 0, (SLAB_RECLAIM_ACCOUNT|
431 SLAB_MEM_SPREAD),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 init_once, NULL);
433 if (befs_inode_cachep == NULL) {
434 printk(KERN_ERR "befs_init_inodecache: "
435 "Couldn't initalize inode slabcache\n");
436 return -ENOMEM;
437 }
438
439 return 0;
440}
441
442/* Called at fs teardown.
443 *
444 * Taken from NFS implementation by Al Viro.
445 */
446static void
447befs_destroy_inodecache(void)
448{
449 if (kmem_cache_destroy(befs_inode_cachep))
450 printk(KERN_ERR "befs_destroy_inodecache: "
451 "not all structures were freed\n");
452}
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) {
492 char *p = nd_get_link(nd);
493 if (!IS_ERR(p))
494 kfree(p);
495 }
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;
762
763 const unsigned long sb_block = 0;
764 const off_t x86_sb_off = 512;
765
766 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL);
767 if (sb->s_fs_info == NULL) {
768 printk(KERN_ERR
769 "BeFS(%s): Unable to allocate memory for private "
770 "portion of superblock. Bailing.\n", sb->s_id);
Adrian Bunk04187262006-06-30 18:23:04 +0200771 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 }
773 befs_sb = BEFS_SB(sb);
774 memset(befs_sb, 0, sizeof(befs_sb_info));
775
776 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
777 befs_error(sb, "cannot parse mount options");
Adrian Bunk04187262006-06-30 18:23:04 +0200778 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 }
780
781 befs_debug(sb, "---> befs_fill_super()");
782
783#ifndef CONFIG_BEFS_RW
784 if (!(sb->s_flags & MS_RDONLY)) {
785 befs_warning(sb,
786 "No write support. Marking filesystem read-only");
787 sb->s_flags |= MS_RDONLY;
788 }
789#endif /* CONFIG_BEFS_RW */
790
791 /*
792 * Set dummy blocksize to read super block.
793 * Will be set to real fs blocksize later.
794 *
795 * Linux 2.4.10 and later refuse to read blocks smaller than
796 * the hardsect size for the device. But we also need to read at
797 * least 1k to get the second 512 bytes of the volume.
798 * -WD 10-26-01
799 */
800 sb_min_blocksize(sb, 1024);
801
802 if (!(bh = sb_bread(sb, sb_block))) {
803 befs_error(sb, "unable to read superblock");
Adrian Bunk04187262006-06-30 18:23:04 +0200804 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 }
806
807 /* account for offset of super block on x86 */
808 disk_sb = (befs_super_block *) bh->b_data;
809 if ((le32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1) ||
810 (be32_to_cpu(disk_sb->magic1) == BEFS_SUPER_MAGIC1)) {
811 befs_debug(sb, "Using PPC superblock location");
812 } else {
813 befs_debug(sb, "Using x86 superblock location");
814 disk_sb =
815 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
816 }
817
818 if (befs_load_sb(sb, disk_sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200819 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
821 befs_dump_super_block(sb, disk_sb);
822
823 brelse(bh);
824
825 if (befs_check_sb(sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200826 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
828 if( befs_sb->num_blocks > ~((sector_t)0) ) {
829 befs_error(sb, "blocks count: %Lu "
830 "is larger than the host can use",
831 befs_sb->num_blocks);
Adrian Bunk04187262006-06-30 18:23:04 +0200832 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 }
834
835 /*
836 * set up enough so that it can read an inode
837 * Fill in kernel superblock fields from private sb
838 */
839 sb->s_magic = BEFS_SUPER_MAGIC;
840 /* Set real blocksize of fs */
841 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
842 sb->s_op = (struct super_operations *) &befs_sops;
843 root = iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
844 sb->s_root = d_alloc_root(root);
845 if (!sb->s_root) {
846 iput(root);
847 befs_error(sb, "get root inode failed");
Adrian Bunk04187262006-06-30 18:23:04 +0200848 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 }
850
851 /* load nls library */
852 if (befs_sb->mount_opts.iocharset) {
853 befs_debug(sb, "Loading nls: %s",
854 befs_sb->mount_opts.iocharset);
855 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
856 if (!befs_sb->nls) {
857 befs_warning(sb, "Cannot load nls %s"
858 " loading default nls",
859 befs_sb->mount_opts.iocharset);
860 befs_sb->nls = load_nls_default();
861 }
862 /* load default nls if none is specified in mount options */
863 } else {
864 befs_debug(sb, "Loading default nls");
865 befs_sb->nls = load_nls_default();
866 }
867
868 return 0;
869/*****************/
Adrian Bunk04187262006-06-30 18:23:04 +0200870 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 brelse(bh);
872
Adrian Bunk04187262006-06-30 18:23:04 +0200873 unacquire_priv_sbp:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 kfree(sb->s_fs_info);
875
Adrian Bunk04187262006-06-30 18:23:04 +0200876 unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 sb->s_fs_info = NULL;
878 return -EINVAL;
879}
880
881static int
882befs_remount(struct super_block *sb, int *flags, char *data)
883{
884 if (!(*flags & MS_RDONLY))
885 return -EINVAL;
886 return 0;
887}
888
889static int
David Howells726c3342006-06-23 02:02:58 -0700890befs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891{
David Howells726c3342006-06-23 02:02:58 -0700892 struct super_block *sb = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
894 befs_debug(sb, "---> befs_statfs()");
895
896 buf->f_type = BEFS_SUPER_MAGIC;
897 buf->f_bsize = sb->s_blocksize;
898 buf->f_blocks = BEFS_SB(sb)->num_blocks;
899 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
900 buf->f_bavail = buf->f_bfree;
901 buf->f_files = 0; /* UNKNOWN */
902 buf->f_ffree = 0; /* UNKNOWN */
903 buf->f_namelen = BEFS_NAME_LEN;
904
905 befs_debug(sb, "<--- befs_statfs()");
906
907 return 0;
908}
909
David Howells454e2392006-06-23 02:02:57 -0700910static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name,
David Howells454e2392006-06-23 02:02:57 -0700912 void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913{
David Howells454e2392006-06-23 02:02:57 -0700914 return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super,
915 mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916}
917
918static struct file_system_type befs_fs_type = {
919 .owner = THIS_MODULE,
920 .name = "befs",
921 .get_sb = befs_get_sb,
922 .kill_sb = kill_block_super,
923 .fs_flags = FS_REQUIRES_DEV,
924};
925
926static int __init
927init_befs_fs(void)
928{
929 int err;
930
931 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION);
932
933 err = befs_init_inodecache();
934 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200935 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936
937 err = register_filesystem(&befs_fs_type);
938 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200939 goto unacquire_inodecache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
941 return 0;
942
Adrian Bunk04187262006-06-30 18:23:04 +0200943unacquire_inodecache:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 befs_destroy_inodecache();
945
Adrian Bunk04187262006-06-30 18:23:04 +0200946unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 return err;
948}
949
950static void __exit
951exit_befs_fs(void)
952{
953 befs_destroy_inodecache();
954
955 unregister_filesystem(&befs_fs_type);
956}
957
958/*
959Macros that typecheck the init and exit functions,
960ensures that they are called at init and cleanup,
961and eliminates warnings about unused functions.
962*/
963module_init(init_befs_fs)
964module_exit(exit_befs_fs)