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7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/fs.h>
13#include <linux/errno.h>
14#include <linux/stat.h>
15#include <linux/nls.h>
16#include <linux/buffer_head.h>
17#include <linux/vfs.h>
18#include <linux/parser.h>
19#include <linux/namei.h>
20#include <linux/sched.h>
21#include <linux/cred.h>
22#include <linux/exportfs.h>
23#include <linux/seq_file.h>
24
25#include "befs.h"
26#include "btree.h"
27#include "inode.h"
28#include "datastream.h"
29#include "super.h"
30#include "io.h"
31
32MODULE_DESCRIPTION("BeOS File System (BeFS) driver");
33MODULE_AUTHOR("Will Dyson");
34MODULE_LICENSE("GPL");
35
36
37#define VFS_BLOCK_SIZE 512
38
39static int befs_readdir(struct file *, struct dir_context *);
40static int befs_get_block(struct inode *, sector_t, struct buffer_head *, int);
41static int befs_readpage(struct file *file, struct page *page);
42static sector_t befs_bmap(struct address_space *mapping, sector_t block);
43static struct dentry *befs_lookup(struct inode *, struct dentry *,
44 unsigned int);
45static struct inode *befs_iget(struct super_block *, unsigned long);
46static struct inode *befs_alloc_inode(struct super_block *sb);
47static void befs_destroy_inode(struct inode *inode);
48static void befs_destroy_inodecache(void);
49static int befs_symlink_readpage(struct file *, struct page *);
50static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
51 char **out, int *out_len);
52static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
53 char **out, int *out_len);
54static void befs_put_super(struct super_block *);
55static int befs_remount(struct super_block *, int *, char *);
56static int befs_statfs(struct dentry *, struct kstatfs *);
57static int befs_show_options(struct seq_file *, struct dentry *);
58static int parse_options(char *, struct befs_mount_options *);
59static struct dentry *befs_fh_to_dentry(struct super_block *sb,
60 struct fid *fid, int fh_len, int fh_type);
61static struct dentry *befs_fh_to_parent(struct super_block *sb,
62 struct fid *fid, int fh_len, int fh_type);
63static struct dentry *befs_get_parent(struct dentry *child);
64
65static const struct super_operations befs_sops = {
66 .alloc_inode = befs_alloc_inode,
67 .destroy_inode = befs_destroy_inode,
68 .put_super = befs_put_super,
69 .statfs = befs_statfs,
70 .remount_fs = befs_remount,
71 .show_options = befs_show_options,
72};
73
74
75static struct kmem_cache *befs_inode_cachep;
76
77static const struct file_operations befs_dir_operations = {
78 .read = generic_read_dir,
79 .iterate_shared = befs_readdir,
80 .llseek = generic_file_llseek,
81};
82
83static const struct inode_operations befs_dir_inode_operations = {
84 .lookup = befs_lookup,
85};
86
87static const struct address_space_operations befs_aops = {
88 .readpage = befs_readpage,
89 .bmap = befs_bmap,
90};
91
92static const struct address_space_operations befs_symlink_aops = {
93 .readpage = befs_symlink_readpage,
94};
95
96static const struct export_operations befs_export_operations = {
97 .fh_to_dentry = befs_fh_to_dentry,
98 .fh_to_parent = befs_fh_to_parent,
99 .get_parent = befs_get_parent,
100};
101
102
103
104
105
106
107
108
109static int
110befs_readpage(struct file *file, struct page *page)
111{
112 return block_read_full_page(page, befs_get_block);
113}
114
115static sector_t
116befs_bmap(struct address_space *mapping, sector_t block)
117{
118 return generic_block_bmap(mapping, block, befs_get_block);
119}
120
121
122
123
124
125
126
127
128
129
130static int
131befs_get_block(struct inode *inode, sector_t block,
132 struct buffer_head *bh_result, int create)
133{
134 struct super_block *sb = inode->i_sb;
135 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
136 befs_block_run run = BAD_IADDR;
137 int res;
138 ulong disk_off;
139
140 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
141 (unsigned long)inode->i_ino, (long)block);
142 if (create) {
143 befs_error(sb, "befs_get_block() was asked to write to "
144 "block %ld in inode %lu", (long)block,
145 (unsigned long)inode->i_ino);
146 return -EPERM;
147 }
148
149 res = befs_fblock2brun(sb, ds, block, &run);
150 if (res != BEFS_OK) {
151 befs_error(sb,
152 "<--- %s for inode %lu, block %ld ERROR",
153 __func__, (unsigned long)inode->i_ino,
154 (long)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, "<--- %s for inode %lu, block %ld, disk address %lu",
163 __func__, (unsigned long)inode->i_ino, (long)block,
164 (unsigned long)disk_off);
165
166 return 0;
167}
168
169static struct dentry *
170befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
171{
172 struct inode *inode;
173 struct super_block *sb = dir->i_sb;
174 const befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
175 befs_off_t offset;
176 int ret;
177 int utfnamelen;
178 char *utfname;
179 const char *name = dentry->d_name.name;
180
181 befs_debug(sb, "---> %s name %pd inode %ld", __func__,
182 dentry, dir->i_ino);
183
184
185 if (BEFS_SB(sb)->nls) {
186 ret =
187 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
188 if (ret < 0) {
189 befs_debug(sb, "<--- %s ERROR", __func__);
190 return ERR_PTR(ret);
191 }
192 ret = befs_btree_find(sb, ds, utfname, &offset);
193 kfree(utfname);
194
195 } else {
196 ret = befs_btree_find(sb, ds, name, &offset);
197 }
198
199 if (ret == BEFS_BT_NOT_FOUND) {
200 befs_debug(sb, "<--- %s %pd not found", __func__, dentry);
201 inode = NULL;
202 } else if (ret != BEFS_OK || offset == 0) {
203 befs_error(sb, "<--- %s Error", __func__);
204 inode = ERR_PTR(-ENODATA);
205 } else {
206 inode = befs_iget(dir->i_sb, (ino_t) offset);
207 }
208 befs_debug(sb, "<--- %s", __func__);
209
210 return d_splice_alias(inode, dentry);
211}
212
213static int
214befs_readdir(struct file *file, struct dir_context *ctx)
215{
216 struct inode *inode = file_inode(file);
217 struct super_block *sb = inode->i_sb;
218 const befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
219 befs_off_t value;
220 int result;
221 size_t keysize;
222 char keybuf[BEFS_NAME_LEN + 1];
223
224 befs_debug(sb, "---> %s name %pD, inode %ld, ctx->pos %lld",
225 __func__, file, inode->i_ino, ctx->pos);
226
227 while (1) {
228 result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
229 keybuf, &keysize, &value);
230
231 if (result == BEFS_ERR) {
232 befs_debug(sb, "<--- %s ERROR", __func__);
233 befs_error(sb, "IO error reading %pD (inode %lu)",
234 file, inode->i_ino);
235 return -EIO;
236
237 } else if (result == BEFS_BT_END) {
238 befs_debug(sb, "<--- %s END", __func__);
239 return 0;
240
241 } else if (result == BEFS_BT_EMPTY) {
242 befs_debug(sb, "<--- %s Empty directory", __func__);
243 return 0;
244 }
245
246
247 if (BEFS_SB(sb)->nls) {
248 char *nlsname;
249 int nlsnamelen;
250
251 result =
252 befs_utf2nls(sb, keybuf, keysize, &nlsname,
253 &nlsnamelen);
254 if (result < 0) {
255 befs_debug(sb, "<--- %s ERROR", __func__);
256 return result;
257 }
258 if (!dir_emit(ctx, nlsname, nlsnamelen,
259 (ino_t) value, DT_UNKNOWN)) {
260 kfree(nlsname);
261 return 0;
262 }
263 kfree(nlsname);
264 } else {
265 if (!dir_emit(ctx, keybuf, keysize,
266 (ino_t) value, DT_UNKNOWN))
267 return 0;
268 }
269 ctx->pos++;
270 }
271}
272
273static struct inode *
274befs_alloc_inode(struct super_block *sb)
275{
276 struct befs_inode_info *bi;
277
278 bi = kmem_cache_alloc(befs_inode_cachep, GFP_KERNEL);
279 if (!bi)
280 return NULL;
281 return &bi->vfs_inode;
282}
283
284static void befs_i_callback(struct rcu_head *head)
285{
286 struct inode *inode = container_of(head, struct inode, i_rcu);
287 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
288}
289
290static void befs_destroy_inode(struct inode *inode)
291{
292 call_rcu(&inode->i_rcu, befs_i_callback);
293}
294
295static void init_once(void *foo)
296{
297 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
298
299 inode_init_once(&bi->vfs_inode);
300}
301
302static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
303{
304 struct buffer_head *bh;
305 befs_inode *raw_inode;
306 struct befs_sb_info *befs_sb = BEFS_SB(sb);
307 struct befs_inode_info *befs_ino;
308 struct inode *inode;
309
310 befs_debug(sb, "---> %s inode = %lu", __func__, ino);
311
312 inode = iget_locked(sb, ino);
313 if (!inode)
314 return ERR_PTR(-ENOMEM);
315 if (!(inode->i_state & I_NEW))
316 return inode;
317
318 befs_ino = BEFS_I(inode);
319
320
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 = sb_bread(sb, inode->i_ino);
328 if (!bh) {
329 befs_error(sb, "unable to read inode block - "
330 "inode = %lu", inode->i_ino);
331 goto unacquire_none;
332 }
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);
340 goto unacquire_bh;
341 }
342
343 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
344
345
346
347
348
349
350 inode->i_uid = befs_sb->mount_opts.use_uid ?
351 befs_sb->mount_opts.uid :
352 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid));
353 inode->i_gid = befs_sb->mount_opts.use_gid ?
354 befs_sb->mount_opts.gid :
355 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid));
356
357 set_nlink(inode, 1);
358
359
360
361
362
363
364
365
366
367
368 inode->i_mtime.tv_sec =
369 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
370 inode->i_mtime.tv_nsec = 0;
371 inode->i_ctime = inode->i_mtime;
372 inode->i_atime = inode->i_mtime;
373
374 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
375 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
376 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
377 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
378
379 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
380 inode->i_size = 0;
381 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
382 strlcpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
383 BEFS_SYMLINK_LEN);
384 } else {
385 int num_blks;
386
387 befs_ino->i_data.ds =
388 fsds_to_cpu(sb, &raw_inode->data.datastream);
389
390 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
391 inode->i_blocks =
392 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
393 inode->i_size = befs_ino->i_data.ds.size;
394 }
395
396 inode->i_mapping->a_ops = &befs_aops;
397
398 if (S_ISREG(inode->i_mode)) {
399 inode->i_fop = &generic_ro_fops;
400 } else if (S_ISDIR(inode->i_mode)) {
401 inode->i_op = &befs_dir_inode_operations;
402 inode->i_fop = &befs_dir_operations;
403 } else if (S_ISLNK(inode->i_mode)) {
404 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
405 inode->i_op = &page_symlink_inode_operations;
406 inode_nohighmem(inode);
407 inode->i_mapping->a_ops = &befs_symlink_aops;
408 } else {
409 inode->i_link = befs_ino->i_data.symlink;
410 inode->i_op = &simple_symlink_inode_operations;
411 }
412 } else {
413 befs_error(sb, "Inode %lu is not a regular file, "
414 "directory or symlink. THAT IS WRONG! BeFS has no "
415 "on disk special files", inode->i_ino);
416 goto unacquire_bh;
417 }
418
419 brelse(bh);
420 befs_debug(sb, "<--- %s", __func__);
421 unlock_new_inode(inode);
422 return inode;
423
424unacquire_bh:
425 brelse(bh);
426
427unacquire_none:
428 iget_failed(inode);
429 befs_debug(sb, "<--- %s - Bad inode", __func__);
430 return ERR_PTR(-EIO);
431}
432
433
434
435
436
437static int __init
438befs_init_inodecache(void)
439{
440 befs_inode_cachep = kmem_cache_create_usercopy("befs_inode_cache",
441 sizeof(struct befs_inode_info), 0,
442 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
443 SLAB_ACCOUNT),
444 offsetof(struct befs_inode_info,
445 i_data.symlink),
446 sizeof_field(struct befs_inode_info,
447 i_data.symlink),
448 init_once);
449 if (befs_inode_cachep == NULL)
450 return -ENOMEM;
451
452 return 0;
453}
454
455
456
457
458
459static void
460befs_destroy_inodecache(void)
461{
462
463
464
465
466 rcu_barrier();
467 kmem_cache_destroy(befs_inode_cachep);
468}
469
470
471
472
473
474
475static int befs_symlink_readpage(struct file *unused, struct page *page)
476{
477 struct inode *inode = page->mapping->host;
478 struct super_block *sb = inode->i_sb;
479 struct befs_inode_info *befs_ino = BEFS_I(inode);
480 befs_data_stream *data = &befs_ino->i_data.ds;
481 befs_off_t len = data->size;
482 char *link = page_address(page);
483
484 if (len == 0 || len > PAGE_SIZE) {
485 befs_error(sb, "Long symlink with illegal length");
486 goto fail;
487 }
488 befs_debug(sb, "Follow long symlink");
489
490 if (befs_read_lsymlink(sb, data, link, len) != len) {
491 befs_error(sb, "Failed to read entire long symlink");
492 goto fail;
493 }
494 link[len - 1] = '\0';
495 SetPageUptodate(page);
496 unlock_page(page);
497 return 0;
498fail:
499 SetPageError(page);
500 unlock_page(page);
501 return -EIO;
502}
503
504
505
506
507
508
509static int
510befs_utf2nls(struct super_block *sb, const char *in,
511 int in_len, char **out, int *out_len)
512{
513 struct nls_table *nls = BEFS_SB(sb)->nls;
514 int i, o;
515 unicode_t uni;
516 int unilen, utflen;
517 char *result;
518
519
520
521
522 int maxlen = in_len + 1;
523
524 befs_debug(sb, "---> %s", __func__);
525
526 if (!nls) {
527 befs_error(sb, "%s called with no NLS table loaded", __func__);
528 return -EINVAL;
529 }
530
531 *out = result = kmalloc(maxlen, GFP_NOFS);
532 if (!*out)
533 return -ENOMEM;
534
535 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
536
537
538 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
539 if (utflen < 0)
540 goto conv_err;
541
542
543 if (uni > MAX_WCHAR_T)
544 goto conv_err;
545 unilen = nls->uni2char(uni, &result[o], in_len - o);
546 if (unilen < 0)
547 goto conv_err;
548 }
549 result[o] = '\0';
550 *out_len = o;
551
552 befs_debug(sb, "<--- %s", __func__);
553
554 return o;
555
556conv_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, "<--- %s", __func__);
560 kfree(result);
561 return -EILSEQ;
562}
563
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582
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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;
595
596
597
598
599
600 int maxlen = (3 * in_len) + 1;
601
602 befs_debug(sb, "---> %s\n", __func__);
603
604 if (!nls) {
605 befs_error(sb, "%s called with no NLS table loaded.",
606 __func__);
607 return -EINVAL;
608 }
609
610 *out = result = kmalloc(maxlen, GFP_NOFS);
611 if (!*out) {
612 *out_len = 0;
613 return -ENOMEM;
614 }
615
616 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
617
618
619 unilen = nls->char2uni(&in[i], in_len - i, &uni);
620 if (unilen < 0)
621 goto conv_err;
622
623
624 utflen = utf32_to_utf8(uni, &result[o], 3);
625 if (utflen <= 0)
626 goto conv_err;
627 }
628
629 result[o] = '\0';
630 *out_len = o;
631
632 befs_debug(sb, "<--- %s", __func__);
633
634 return i;
635
636conv_err:
637 befs_error(sb, "Name using character set %s contains a character that "
638 "cannot be converted to unicode.", nls->charset);
639 befs_debug(sb, "<--- %s", __func__);
640 kfree(result);
641 return -EILSEQ;
642}
643
644static struct inode *befs_nfs_get_inode(struct super_block *sb, uint64_t ino,
645 uint32_t generation)
646{
647
648 return befs_iget(sb, ino);
649}
650
651
652
653
654static struct dentry *befs_fh_to_dentry(struct super_block *sb,
655 struct fid *fid, int fh_len, int fh_type)
656{
657 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
658 befs_nfs_get_inode);
659}
660
661
662
663
664static struct dentry *befs_fh_to_parent(struct super_block *sb,
665 struct fid *fid, int fh_len, int fh_type)
666{
667 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
668 befs_nfs_get_inode);
669}
670
671static struct dentry *befs_get_parent(struct dentry *child)
672{
673 struct inode *parent;
674 struct befs_inode_info *befs_ino = BEFS_I(d_inode(child));
675
676 parent = befs_iget(child->d_sb,
677 (unsigned long)befs_ino->i_parent.start);
678 if (IS_ERR(parent))
679 return ERR_CAST(parent);
680
681 return d_obtain_alias(parent);
682}
683
684enum {
685 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
686};
687
688static const match_table_t befs_tokens = {
689 {Opt_uid, "uid=%d"},
690 {Opt_gid, "gid=%d"},
691 {Opt_charset, "iocharset=%s"},
692 {Opt_debug, "debug"},
693 {Opt_err, NULL}
694};
695
696static int
697parse_options(char *options, struct befs_mount_options *opts)
698{
699 char *p;
700 substring_t args[MAX_OPT_ARGS];
701 int option;
702 kuid_t uid;
703 kgid_t gid;
704
705
706 opts->uid = GLOBAL_ROOT_UID;
707 opts->gid = GLOBAL_ROOT_GID;
708 opts->use_uid = 0;
709 opts->use_gid = 0;
710 opts->iocharset = NULL;
711 opts->debug = 0;
712
713 if (!options)
714 return 1;
715
716 while ((p = strsep(&options, ",")) != NULL) {
717 int token;
718
719 if (!*p)
720 continue;
721
722 token = match_token(p, befs_tokens, args);
723 switch (token) {
724 case Opt_uid:
725 if (match_int(&args[0], &option))
726 return 0;
727 uid = INVALID_UID;
728 if (option >= 0)
729 uid = make_kuid(current_user_ns(), option);
730 if (!uid_valid(uid)) {
731 pr_err("Invalid uid %d, "
732 "using default\n", option);
733 break;
734 }
735 opts->uid = uid;
736 opts->use_uid = 1;
737 break;
738 case Opt_gid:
739 if (match_int(&args[0], &option))
740 return 0;
741 gid = INVALID_GID;
742 if (option >= 0)
743 gid = make_kgid(current_user_ns(), option);
744 if (!gid_valid(gid)) {
745 pr_err("Invalid gid %d, "
746 "using default\n", option);
747 break;
748 }
749 opts->gid = gid;
750 opts->use_gid = 1;
751 break;
752 case Opt_charset:
753 kfree(opts->iocharset);
754 opts->iocharset = match_strdup(&args[0]);
755 if (!opts->iocharset) {
756 pr_err("allocation failure for "
757 "iocharset string\n");
758 return 0;
759 }
760 break;
761 case Opt_debug:
762 opts->debug = 1;
763 break;
764 default:
765 pr_err("Unrecognized mount option \"%s\" "
766 "or missing value\n", p);
767 return 0;
768 }
769 }
770 return 1;
771}
772
773static int befs_show_options(struct seq_file *m, struct dentry *root)
774{
775 struct befs_sb_info *befs_sb = BEFS_SB(root->d_sb);
776 struct befs_mount_options *opts = &befs_sb->mount_opts;
777
778 if (!uid_eq(opts->uid, GLOBAL_ROOT_UID))
779 seq_printf(m, ",uid=%u",
780 from_kuid_munged(&init_user_ns, opts->uid));
781 if (!gid_eq(opts->gid, GLOBAL_ROOT_GID))
782 seq_printf(m, ",gid=%u",
783 from_kgid_munged(&init_user_ns, opts->gid));
784 if (opts->iocharset)
785 seq_printf(m, ",charset=%s", opts->iocharset);
786 if (opts->debug)
787 seq_puts(m, ",debug");
788 return 0;
789}
790
791
792
793
794
795
796static void
797befs_put_super(struct super_block *sb)
798{
799 kfree(BEFS_SB(sb)->mount_opts.iocharset);
800 BEFS_SB(sb)->mount_opts.iocharset = NULL;
801 unload_nls(BEFS_SB(sb)->nls);
802 kfree(sb->s_fs_info);
803 sb->s_fs_info = NULL;
804}
805
806
807
808
809
810
811
812static int
813befs_fill_super(struct super_block *sb, void *data, int silent)
814{
815 struct buffer_head *bh;
816 struct befs_sb_info *befs_sb;
817 befs_super_block *disk_sb;
818 struct inode *root;
819 long ret = -EINVAL;
820 const unsigned long sb_block = 0;
821 const off_t x86_sb_off = 512;
822 int blocksize;
823
824 sb->s_fs_info = kzalloc(sizeof(*befs_sb), GFP_KERNEL);
825 if (sb->s_fs_info == NULL)
826 goto unacquire_none;
827
828 befs_sb = BEFS_SB(sb);
829
830 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
831 if (!silent)
832 befs_error(sb, "cannot parse mount options");
833 goto unacquire_priv_sbp;
834 }
835
836 befs_debug(sb, "---> %s", __func__);
837
838 if (!sb_rdonly(sb)) {
839 befs_warning(sb,
840 "No write support. Marking filesystem read-only");
841 sb->s_flags |= SB_RDONLY;
842 }
843
844
845
846
847
848
849
850
851
852 blocksize = sb_min_blocksize(sb, 1024);
853 if (!blocksize) {
854 if (!silent)
855 befs_error(sb, "unable to set blocksize");
856 goto unacquire_priv_sbp;
857 }
858
859 bh = sb_bread(sb, sb_block);
860 if (!bh) {
861 if (!silent)
862 befs_error(sb, "unable to read superblock");
863 goto unacquire_priv_sbp;
864 }
865
866
867 disk_sb = (befs_super_block *) bh->b_data;
868 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
869 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
870 befs_debug(sb, "Using PPC superblock location");
871 } else {
872 befs_debug(sb, "Using x86 superblock location");
873 disk_sb =
874 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
875 }
876
877 if ((befs_load_sb(sb, disk_sb) != BEFS_OK) ||
878 (befs_check_sb(sb) != BEFS_OK))
879 goto unacquire_bh;
880
881 befs_dump_super_block(sb, disk_sb);
882
883 brelse(bh);
884
885 if (befs_sb->num_blocks > ~((sector_t)0)) {
886 if (!silent)
887 befs_error(sb, "blocks count: %llu is larger than the host can use",
888 befs_sb->num_blocks);
889 goto unacquire_priv_sbp;
890 }
891
892
893
894
895
896 sb->s_magic = BEFS_SUPER_MAGIC;
897
898 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
899 sb->s_op = &befs_sops;
900 sb->s_export_op = &befs_export_operations;
901 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
902 if (IS_ERR(root)) {
903 ret = PTR_ERR(root);
904 goto unacquire_priv_sbp;
905 }
906 sb->s_root = d_make_root(root);
907 if (!sb->s_root) {
908 if (!silent)
909 befs_error(sb, "get root inode failed");
910 goto unacquire_priv_sbp;
911 }
912
913
914 if (befs_sb->mount_opts.iocharset) {
915 befs_debug(sb, "Loading nls: %s",
916 befs_sb->mount_opts.iocharset);
917 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
918 if (!befs_sb->nls) {
919 befs_warning(sb, "Cannot load nls %s"
920 " loading default nls",
921 befs_sb->mount_opts.iocharset);
922 befs_sb->nls = load_nls_default();
923 }
924
925 } else {
926 befs_debug(sb, "Loading default nls");
927 befs_sb->nls = load_nls_default();
928 }
929
930 return 0;
931
932unacquire_bh:
933 brelse(bh);
934
935unacquire_priv_sbp:
936 kfree(befs_sb->mount_opts.iocharset);
937 kfree(sb->s_fs_info);
938 sb->s_fs_info = NULL;
939
940unacquire_none:
941 return ret;
942}
943
944static int
945befs_remount(struct super_block *sb, int *flags, char *data)
946{
947 sync_filesystem(sb);
948 if (!(*flags & SB_RDONLY))
949 return -EINVAL;
950 return 0;
951}
952
953static int
954befs_statfs(struct dentry *dentry, struct kstatfs *buf)
955{
956 struct super_block *sb = dentry->d_sb;
957 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
958
959 befs_debug(sb, "---> %s", __func__);
960
961 buf->f_type = BEFS_SUPER_MAGIC;
962 buf->f_bsize = sb->s_blocksize;
963 buf->f_blocks = BEFS_SB(sb)->num_blocks;
964 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
965 buf->f_bavail = buf->f_bfree;
966 buf->f_files = 0;
967 buf->f_ffree = 0;
968 buf->f_fsid.val[0] = (u32)id;
969 buf->f_fsid.val[1] = (u32)(id >> 32);
970 buf->f_namelen = BEFS_NAME_LEN;
971
972 befs_debug(sb, "<--- %s", __func__);
973
974 return 0;
975}
976
977static struct dentry *
978befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
979 void *data)
980{
981 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
982}
983
984static struct file_system_type befs_fs_type = {
985 .owner = THIS_MODULE,
986 .name = "befs",
987 .mount = befs_mount,
988 .kill_sb = kill_block_super,
989 .fs_flags = FS_REQUIRES_DEV,
990};
991MODULE_ALIAS_FS("befs");
992
993static int __init
994init_befs_fs(void)
995{
996 int err;
997
998 pr_info("version: %s\n", BEFS_VERSION);
999
1000 err = befs_init_inodecache();
1001 if (err)
1002 goto unacquire_none;
1003
1004 err = register_filesystem(&befs_fs_type);
1005 if (err)
1006 goto unacquire_inodecache;
1007
1008 return 0;
1009
1010unacquire_inodecache:
1011 befs_destroy_inodecache();
1012
1013unacquire_none:
1014 return err;
1015}
1016
1017static void __exit
1018exit_befs_fs(void)
1019{
1020 befs_destroy_inodecache();
1021
1022 unregister_filesystem(&befs_fs_type);
1023}
1024
1025
1026
1027
1028
1029
1030module_init(init_befs_fs)
1031module_exit(exit_befs_fs)
1032