blob: de5bb280a82895939c6cd9cce29005b5030689ab [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"
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);
44static int befs_follow_link(struct dentry *, struct nameidata *);
45static void befs_put_link(struct dentry *, struct nameidata *);
46static 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 *);
52static int befs_statfs(struct super_block *, struct kstatfs *);
53static 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
67static struct file_operations befs_dir_operations = {
68 .read = generic_read_dir,
69 .readdir = befs_readdir,
70};
71
72static struct inode_operations befs_dir_inode_operations = {
73 .lookup = befs_lookup,
74};
75
76static struct file_operations befs_file_operations = {
77 .llseek = default_llseek,
78 .read = generic_file_read,
79 .mmap = generic_file_readonly_mmap,
80};
81
82static struct address_space_operations befs_aops = {
83 .readpage = befs_readpage,
84 .sync_page = block_sync_page,
85 .bmap = befs_bmap,
86};
87
88static struct inode_operations befs_symlink_inode_operations = {
89 .readlink = generic_readlink,
90 .follow_link = befs_follow_link,
91 .put_link = befs_put_link,
92};
93
94/*
95 * Called by generic_file_read() to read a page of data
96 *
97 * In turn, simply calls a generic block read function and
98 * passes it the address of befs_get_block, for mapping file
99 * positions to disk blocks.
100 */
101static int
102befs_readpage(struct file *file, struct page *page)
103{
104 return block_read_full_page(page, befs_get_block);
105}
106
107static sector_t
108befs_bmap(struct address_space *mapping, sector_t block)
109{
110 return generic_block_bmap(mapping, block, befs_get_block);
111}
112
113/*
114 * Generic function to map a file position (block) to a
115 * disk offset (passed back in bh_result).
116 *
117 * Used by many higher level functions.
118 *
119 * Calls befs_fblock2brun() in datastream.c to do the real work.
120 *
121 * -WD 10-26-01
122 */
123
124static int
125befs_get_block(struct inode *inode, sector_t block,
126 struct buffer_head *bh_result, int create)
127{
128 struct super_block *sb = inode->i_sb;
129 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
130 befs_block_run run = BAD_IADDR;
131 int res = 0;
132 ulong disk_off;
133
134 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
135 inode->i_ino, block);
136
137 if (block < 0) {
138 befs_error(sb, "befs_get_block() was asked for a block "
139 "number less than zero: block %ld in inode %lu",
140 block, inode->i_ino);
141 return -EIO;
142 }
143
144 if (create) {
145 befs_error(sb, "befs_get_block() was asked to write to "
146 "block %ld in inode %lu", block, inode->i_ino);
147 return -EPERM;
148 }
149
150 res = befs_fblock2brun(sb, ds, block, &run);
151 if (res != BEFS_OK) {
152 befs_error(sb,
153 "<--- befs_get_block() for inode %lu, block "
154 "%ld ERROR", inode->i_ino, block);
155 return -EFBIG;
156 }
157
158 disk_off = (ulong) iaddr2blockno(sb, &run);
159
160 map_bh(bh_result, inode->i_sb, disk_off);
161
162 befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, "
163 "disk address %lu", inode->i_ino, block, disk_off);
164
165 return 0;
166}
167
168static struct dentry *
169befs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
170{
171 struct inode *inode = NULL;
172 struct super_block *sb = dir->i_sb;
173 befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
174 befs_off_t offset;
175 int ret;
176 int utfnamelen;
177 char *utfname;
178 const char *name = dentry->d_name.name;
179
180 befs_debug(sb, "---> befs_lookup() "
181 "name %s inode %ld", dentry->d_name.name, dir->i_ino);
182
183 /* Convert to UTF-8 */
184 if (BEFS_SB(sb)->nls) {
185 ret =
186 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
187 if (ret < 0) {
188 befs_debug(sb, "<--- befs_lookup() ERROR");
189 return ERR_PTR(ret);
190 }
191 ret = befs_btree_find(sb, ds, utfname, &offset);
192 kfree(utfname);
193
194 } else {
195 ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset);
196 }
197
198 if (ret == BEFS_BT_NOT_FOUND) {
199 befs_debug(sb, "<--- befs_lookup() %s not found",
200 dentry->d_name.name);
201 return ERR_PTR(-ENOENT);
202
203 } else if (ret != BEFS_OK || offset == 0) {
204 befs_warning(sb, "<--- befs_lookup() Error");
205 return ERR_PTR(-ENODATA);
206 }
207
208 inode = iget(dir->i_sb, (ino_t) offset);
209 if (!inode)
210 return ERR_PTR(-EACCES);
211
212 d_add(dentry, inode);
213
214 befs_debug(sb, "<--- befs_lookup()");
215
216 return NULL;
217}
218
219static int
220befs_readdir(struct file *filp, void *dirent, filldir_t filldir)
221{
222 struct inode *inode = filp->f_dentry->d_inode;
223 struct super_block *sb = inode->i_sb;
224 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
225 befs_off_t value;
226 int result;
227 size_t keysize;
228 unsigned char d_type;
229 char keybuf[BEFS_NAME_LEN + 1];
230 char *nlsname;
231 int nlsnamelen;
232 const char *dirname = filp->f_dentry->d_name.name;
233
234 befs_debug(sb, "---> befs_readdir() "
235 "name %s, inode %ld, filp->f_pos %Ld",
236 dirname, inode->i_ino, filp->f_pos);
237
238 result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1,
239 keybuf, &keysize, &value);
240
241 if (result == BEFS_ERR) {
242 befs_debug(sb, "<--- befs_readdir() ERROR");
243 befs_error(sb, "IO error reading %s (inode %lu)",
244 dirname, inode->i_ino);
245 return -EIO;
246
247 } else if (result == BEFS_BT_END) {
248 befs_debug(sb, "<--- befs_readdir() END");
249 return 0;
250
251 } else if (result == BEFS_BT_EMPTY) {
252 befs_debug(sb, "<--- befs_readdir() Empty directory");
253 return 0;
254 }
255
256 d_type = DT_UNKNOWN;
257
258 /* Convert to NLS */
259 if (BEFS_SB(sb)->nls) {
260 result =
261 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
262 if (result < 0) {
263 befs_debug(sb, "<--- befs_readdir() ERROR");
264 return result;
265 }
266 result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos,
267 (ino_t) value, d_type);
268 kfree(nlsname);
269
270 } else {
271 result = filldir(dirent, keybuf, keysize, filp->f_pos,
272 (ino_t) value, d_type);
273 }
274
275 filp->f_pos++;
276
277 befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos);
278
279 return 0;
280}
281
282static struct inode *
283befs_alloc_inode(struct super_block *sb)
284{
285 struct befs_inode_info *bi;
286 bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep,
287 SLAB_KERNEL);
288 if (!bi)
289 return NULL;
290 return &bi->vfs_inode;
291}
292
293static void
294befs_destroy_inode(struct inode *inode)
295{
296 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
297}
298
299static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
300{
301 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
302
303 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
304 SLAB_CTOR_CONSTRUCTOR) {
305 inode_init_once(&bi->vfs_inode);
306 }
307}
308
309static void
310befs_read_inode(struct inode *inode)
311{
312 struct buffer_head *bh = NULL;
313 befs_inode *raw_inode = NULL;
314
315 struct super_block *sb = inode->i_sb;
316 befs_sb_info *befs_sb = BEFS_SB(sb);
317 befs_inode_info *befs_ino = NULL;
318
319 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", inode->i_ino);
320
321 befs_ino = BEFS_I(inode);
322
323 /* convert from vfs's inode number to befs's inode number */
324 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
325
326 befs_debug(sb, " real inode number [%u, %hu, %hu]",
327 befs_ino->i_inode_num.allocation_group,
328 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
329
330 bh = befs_bread(sb, inode->i_ino);
331 if (!bh) {
332 befs_error(sb, "unable to read inode block - "
333 "inode = %lu", inode->i_ino);
334 goto unaquire_none;
335 }
336
337 raw_inode = (befs_inode *) bh->b_data;
338
339 befs_dump_inode(sb, raw_inode);
340
341 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
342 befs_error(sb, "Bad inode: %lu", inode->i_ino);
343 goto unaquire_bh;
344 }
345
346 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
347
348 /*
349 * set uid and gid. But since current BeOS is single user OS, so
350 * you can change by "uid" or "gid" options.
351 */
352
353 inode->i_uid = befs_sb->mount_opts.use_uid ?
354 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid);
355 inode->i_gid = befs_sb->mount_opts.use_gid ?
356 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid);
357
358 inode->i_nlink = 1;
359
360 /*
361 * BEFS's time is 64 bits, but current VFS is 32 bits...
362 * BEFS don't have access time. Nor inode change time. VFS
363 * doesn't have creation time.
364 * Also, the lower 16 bits of the last_modified_time and
365 * create_time are just a counter to help ensure uniqueness
366 * for indexing purposes. (PFD, page 54)
367 */
368
369 inode->i_mtime.tv_sec =
370 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
371 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
372 inode->i_ctime = inode->i_mtime;
373 inode->i_atime = inode->i_mtime;
374 inode->i_blksize = befs_sb->block_size;
375
376 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
377 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
378 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
379 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
380
381 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
382 inode->i_size = 0;
383 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
384 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
385 BEFS_SYMLINK_LEN);
386 } else {
387 int num_blks;
388
389 befs_ino->i_data.ds =
390 fsds_to_cpu(sb, raw_inode->data.datastream);
391
392 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
393 inode->i_blocks =
394 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
395 inode->i_size = befs_ino->i_data.ds.size;
396 }
397
398 inode->i_mapping->a_ops = &befs_aops;
399
400 if (S_ISREG(inode->i_mode)) {
401 inode->i_fop = &befs_file_operations;
402 } else if (S_ISDIR(inode->i_mode)) {
403 inode->i_op = &befs_dir_inode_operations;
404 inode->i_fop = &befs_dir_operations;
405 } else if (S_ISLNK(inode->i_mode)) {
406 inode->i_op = &befs_symlink_inode_operations;
407 } else {
408 befs_error(sb, "Inode %lu is not a regular file, "
409 "directory or symlink. THAT IS WRONG! BeFS has no "
410 "on disk special files", inode->i_ino);
411 goto unaquire_bh;
412 }
413
414 brelse(bh);
415 befs_debug(sb, "<--- befs_read_inode()");
416 return;
417
418 unaquire_bh:
419 brelse(bh);
420
421 unaquire_none:
422 make_bad_inode(inode);
423 befs_debug(sb, "<--- befs_read_inode() - Bad inode");
424 return;
425}
426
427/* Initialize the inode cache. Called at fs setup.
428 *
429 * Taken from NFS implementation by Al Viro.
430 */
431static int
432befs_init_inodecache(void)
433{
434 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
435 sizeof (struct befs_inode_info),
436 0, SLAB_RECLAIM_ACCOUNT,
437 init_once, NULL);
438 if (befs_inode_cachep == NULL) {
439 printk(KERN_ERR "befs_init_inodecache: "
440 "Couldn't initalize inode slabcache\n");
441 return -ENOMEM;
442 }
443
444 return 0;
445}
446
447/* Called at fs teardown.
448 *
449 * Taken from NFS implementation by Al Viro.
450 */
451static void
452befs_destroy_inodecache(void)
453{
454 if (kmem_cache_destroy(befs_inode_cachep))
455 printk(KERN_ERR "befs_destroy_inodecache: "
456 "not all structures were freed\n");
457}
458
459/*
460 * The inode of symbolic link is different to data stream.
461 * The data stream become link name. Unless the LONG_SYMLINK
462 * flag is set.
463 */
464static int
465befs_follow_link(struct dentry *dentry, struct nameidata *nd)
466{
467 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
468 char *link;
469
470 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
471 struct super_block *sb = dentry->d_sb;
472 befs_data_stream *data = &befs_ino->i_data.ds;
473 befs_off_t len = data->size;
474
475 befs_debug(sb, "Follow long symlink");
476
477 link = kmalloc(len, GFP_NOFS);
478 if (!link) {
479 link = ERR_PTR(-ENOMEM);
480 } else if (befs_read_lsymlink(sb, data, link, len) != len) {
481 kfree(link);
482 befs_error(sb, "Failed to read entire long symlink");
483 link = ERR_PTR(-EIO);
484 }
485 } else {
486 link = befs_ino->i_data.symlink;
487 }
488
489 nd_set_link(nd, link);
490 return 0;
491}
492
493static void befs_put_link(struct dentry *dentry, struct nameidata *nd)
494{
495 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
496 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
497 char *p = nd_get_link(nd);
498 if (!IS_ERR(p))
499 kfree(p);
500 }
501}
502
503/*
504 * UTF-8 to NLS charset convert routine
505 *
506 *
507 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
508 * the nls tables directly
509 */
510
511static int
512befs_utf2nls(struct super_block *sb, const char *in,
513 int in_len, char **out, int *out_len)
514{
515 struct nls_table *nls = BEFS_SB(sb)->nls;
516 int i, o;
517 wchar_t uni;
518 int unilen, utflen;
519 char *result;
520 int maxlen = in_len; /* The utf8->nls conversion can't make more chars */
521
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
570 * @dest: The output string in UTF8 format
571 * @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;
596 int maxlen = 3 * in_len;
597
598 befs_debug(sb, "---> nls2utf()\n");
599
600 if (!nls) {
601 befs_error(sb, "befs_nls2utf called with no NLS table loaded.");
602 return -EINVAL;
603 }
604
605 *out = result = kmalloc(maxlen, GFP_NOFS);
606 if (!*out) {
607 befs_error(sb, "befs_nls2utf() cannot allocate memory");
608 *out_len = 0;
609 return -ENOMEM;
610 }
611
612 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
613
614 /* convert from nls to unicode */
615 unilen = nls->char2uni(&in[i], in_len - i, &uni);
616 if (unilen < 0) {
617 goto conv_err;
618 }
619
620 /* convert from unicode to UTF-8 */
621 utflen = utf8_wctomb(&result[o], uni, 3);
622 if (utflen <= 0) {
623 goto conv_err;
624 }
625 }
626
627 result[o] = '\0';
628 *out_len = o;
629
630 befs_debug(sb, "<--- nls2utf()");
631
632 return i;
633
634 conv_err:
635 befs_error(sb, "Name using charecter set %s contains a charecter that "
636 "cannot be converted to unicode.", nls->charset);
637 befs_debug(sb, "<--- nls2utf()");
638 kfree(result);
639 return -EILSEQ;
640}
641
642/**
643 * Use the
644 *
645 */
646enum {
647 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
648};
649
650static match_table_t befs_tokens = {
651 {Opt_uid, "uid=%d"},
652 {Opt_gid, "gid=%d"},
653 {Opt_charset, "iocharset=%s"},
654 {Opt_debug, "debug"},
655 {Opt_err, NULL}
656};
657
658static int
659parse_options(char *options, befs_mount_options * opts)
660{
661 char *p;
662 substring_t args[MAX_OPT_ARGS];
663 int option;
664
665 /* Initialize options */
666 opts->uid = 0;
667 opts->gid = 0;
668 opts->use_uid = 0;
669 opts->use_gid = 0;
670 opts->iocharset = NULL;
671 opts->debug = 0;
672
673 if (!options)
674 return 1;
675
676 while ((p = strsep(&options, ",")) != NULL) {
677 int token;
678 if (!*p)
679 continue;
680
681 token = match_token(p, befs_tokens, args);
682 switch (token) {
683 case Opt_uid:
684 if (match_int(&args[0], &option))
685 return 0;
686 if (option < 0) {
687 printk(KERN_ERR "BeFS: Invalid uid %d, "
688 "using default\n", option);
689 break;
690 }
691 opts->uid = option;
692 opts->use_uid = 1;
693 break;
694 case Opt_gid:
695 if (match_int(&args[0], &option))
696 return 0;
697 if (option < 0) {
698 printk(KERN_ERR "BeFS: Invalid gid %d, "
699 "using default\n", option);
700 break;
701 }
702 opts->gid = option;
703 opts->use_gid = 1;
704 break;
705 case Opt_charset:
706 kfree(opts->iocharset);
707 opts->iocharset = match_strdup(&args[0]);
708 if (!opts->iocharset) {
709 printk(KERN_ERR "BeFS: allocation failure for "
710 "iocharset string\n");
711 return 0;
712 }
713 break;
714 case Opt_debug:
715 opts->debug = 1;
716 break;
717 default:
718 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" "
719 "or missing value\n", p);
720 return 0;
721 }
722 }
723 return 1;
724}
725
726/* This function has the responsibiltiy of getting the
727 * filesystem ready for unmounting.
728 * Basicly, we free everything that we allocated in
729 * befs_read_inode
730 */
731static void
732befs_put_super(struct super_block *sb)
733{
734 if (BEFS_SB(sb)->mount_opts.iocharset) {
735 kfree(BEFS_SB(sb)->mount_opts.iocharset);
736 BEFS_SB(sb)->mount_opts.iocharset = NULL;
737 }
738
739 if (BEFS_SB(sb)->nls) {
740 unload_nls(BEFS_SB(sb)->nls);
741 BEFS_SB(sb)->nls = NULL;
742 }
743
744 if (sb->s_fs_info) {
745 kfree(sb->s_fs_info);
746 sb->s_fs_info = NULL;
747 }
748 return;
749}
750
751/* Allocate private field of the superblock, fill it.
752 *
753 * Finish filling the public superblock fields
754 * Make the root directory
755 * Load a set of NLS translations if needed.
756 */
757static int
758befs_fill_super(struct super_block *sb, void *data, int silent)
759{
760 struct buffer_head *bh;
761 befs_sb_info *befs_sb;
762 befs_super_block *disk_sb;
763 struct inode *root;
764
765 const unsigned long sb_block = 0;
766 const off_t x86_sb_off = 512;
767
768 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);
773 goto unaquire_none;
774 }
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");
780 goto unaquire_priv_sbp;
781 }
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");
806 goto unaquire_priv_sbp;
807 }
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)
821 goto unaquire_bh;
822
823 befs_dump_super_block(sb, disk_sb);
824
825 brelse(bh);
826
827 if (befs_check_sb(sb) != BEFS_OK)
828 goto unaquire_priv_sbp;
829
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);
834 goto unaquire_priv_sbp;
835 }
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;
845 root = iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
846 sb->s_root = d_alloc_root(root);
847 if (!sb->s_root) {
848 iput(root);
849 befs_error(sb, "get root inode failed");
850 goto unaquire_priv_sbp;
851 }
852
853 /* load nls library */
854 if (befs_sb->mount_opts.iocharset) {
855 befs_debug(sb, "Loading nls: %s",
856 befs_sb->mount_opts.iocharset);
857 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
858 if (!befs_sb->nls) {
859 befs_warning(sb, "Cannot load nls %s"
860 " loading default nls",
861 befs_sb->mount_opts.iocharset);
862 befs_sb->nls = load_nls_default();
863 }
864 /* load default nls if none is specified in mount options */
865 } else {
866 befs_debug(sb, "Loading default nls");
867 befs_sb->nls = load_nls_default();
868 }
869
870 return 0;
871/*****************/
872 unaquire_bh:
873 brelse(bh);
874
875 unaquire_priv_sbp:
876 kfree(sb->s_fs_info);
877
878 unaquire_none:
879 sb->s_fs_info = NULL;
880 return -EINVAL;
881}
882
883static int
884befs_remount(struct super_block *sb, int *flags, char *data)
885{
886 if (!(*flags & MS_RDONLY))
887 return -EINVAL;
888 return 0;
889}
890
891static int
892befs_statfs(struct super_block *sb, struct kstatfs *buf)
893{
894
895 befs_debug(sb, "---> befs_statfs()");
896
897 buf->f_type = BEFS_SUPER_MAGIC;
898 buf->f_bsize = sb->s_blocksize;
899 buf->f_blocks = BEFS_SB(sb)->num_blocks;
900 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
901 buf->f_bavail = buf->f_bfree;
902 buf->f_files = 0; /* UNKNOWN */
903 buf->f_ffree = 0; /* UNKNOWN */
904 buf->f_namelen = BEFS_NAME_LEN;
905
906 befs_debug(sb, "<--- befs_statfs()");
907
908 return 0;
909}
910
911static struct super_block *
912befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name,
913 void *data)
914{
915 return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super);
916}
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)
935 goto unaquire_none;
936
937 err = register_filesystem(&befs_fs_type);
938 if (err)
939 goto unaquire_inodecache;
940
941 return 0;
942
943unaquire_inodecache:
944 befs_destroy_inodecache();
945
946unaquire_none:
947 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)