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1/*
2 * linux/fs/befs/linuxvfs.c
3 *
4 * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
5 *
6 */
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/* The units the vfs expects inode->i_blocks to be in */
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, /* allocate a new inode */
67 .destroy_inode = befs_destroy_inode, /* deallocate an inode */
68 .put_super = befs_put_super, /* uninit super */
69 .statfs = befs_statfs, /* statfs */
70 .remount_fs = befs_remount,
71 .show_options = befs_show_options,
72};
73
74/* slab cache for befs_inode_info objects */
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 * Called by generic_file_read() to read a page of data
104 *
105 * In turn, simply calls a generic block read function and
106 * passes it the address of befs_get_block, for mapping file
107 * positions to disk blocks.
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 * Generic function to map a file position (block) to a
123 * disk offset (passed back in bh_result).
124 *
125 * Used by many higher level functions.
126 *
127 * Calls befs_fblock2brun() in datastream.c to do the real work.
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 /* Convert to UTF-8 */
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 /* Convert to NLS */
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 /* convert from vfs's inode number to befs's inode number */
321 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
322
323 befs_debug(sb, " real inode number [%u, %hu, %hu]",
324 befs_ino->i_inode_num.allocation_group,
325 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
326
327 bh = 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 * set uid and gid. But since current BeOS is single user OS, so
347 * you can change by "uid" or "gid" options.
348 */
349
350 inode->i_uid = befs_sb->mount_opts.use_uid ?
351 befs_sb->mount_opts.uid :
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 * BEFS's time is 64 bits, but current VFS is 32 bits...
361 * BEFS don't have access time. Nor inode change time. VFS
362 * doesn't have creation time.
363 * Also, the lower 16 bits of the last_modified_time and
364 * create_time are just a counter to help ensure uniqueness
365 * for indexing purposes. (PFD, page 54)
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; /* lower 16 bits are not a time */
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/* Initialize the inode cache. Called at fs setup.
434 *
435 * Taken from NFS implementation by Al Viro.
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/* Called at fs teardown.
456 *
457 * Taken from NFS implementation by Al Viro.
458 */
459static void
460befs_destroy_inodecache(void)
461{
462 /*
463 * Make sure all delayed rcu free inodes are flushed before we
464 * destroy cache.
465 */
466 rcu_barrier();
467 kmem_cache_destroy(befs_inode_cachep);
468}
469
470/*
471 * The inode of symbolic link is different to data stream.
472 * The data stream become link name. Unless the LONG_SYMLINK
473 * flag is set.
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 * UTF-8 to NLS charset convert routine
506 *
507 * Uses uni2char() / char2uni() rather than the nls tables directly
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 /* The utf8->nls conversion won't make the final nls string bigger
519 * than the utf one, but if the string is pure ascii they'll have the
520 * same width and an extra char is needed to save the additional \0
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 /* convert from UTF-8 to Unicode */
538 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
539 if (utflen < 0)
540 goto conv_err;
541
542 /* convert from Unicode to nls */
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
564/**
565 * befs_nls2utf - Convert NLS string to utf8 encodeing
566 * @sb: Superblock
567 * @in: Input string buffer in NLS format
568 * @in_len: Length of input string in bytes
569 * @out: The output string in UTF-8 format
570 * @out_len: Length of the output buffer
571 *
572 * Converts input string @in, which is in the format of the loaded NLS map,
573 * into a utf8 string.
574 *
575 * The destination string @out is allocated by this function and the caller is
576 * responsible for freeing it with kfree()
577 *
578 * On return, *@out_len is the length of @out in bytes.
579 *
580 * On success, the return value is the number of utf8 characters written to
581 * the output buffer @out.
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;
595 /*
596 * There are nls characters that will translate to 3-chars-wide UTF-8
597 * characters, an additional byte is needed to save the final \0
598 * in special cases
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 /* convert from nls to unicode */
619 unilen = nls->char2uni(&in[i], in_len - i, &uni);
620 if (unilen < 0)
621 goto conv_err;
622
623 /* convert from unicode to UTF-8 */
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 /* No need to handle i_generation */
648 return befs_iget(sb, ino);
649}
650
651/*
652 * Map a NFS file handle to a corresponding dentry
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 * Find the parent for a file specified by NFS handle
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 /* Initialize options */
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/* This function has the responsibiltiy of getting the
792 * filesystem ready for unmounting.
793 * Basically, we free everything that we allocated in
794 * befs_read_inode
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/* Allocate private field of the superblock, fill it.
807 *
808 * Finish filling the public superblock fields
809 * Make the root directory
810 * Load a set of NLS translations if needed.
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 * Set dummy blocksize to read super block.
846 * Will be set to real fs blocksize later.
847 *
848 * Linux 2.4.10 and later refuse to read blocks smaller than
849 * the logical block size for the device. But we also need to read at
850 * least 1k to get the second 512 bytes of the volume.
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 /* account for offset of super block on x86 */
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 * set up enough so that it can read an inode
894 * Fill in kernel superblock fields from private sb
895 */
896 sb->s_magic = BEFS_SUPER_MAGIC;
897 /* Set real blocksize of fs */
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 /* load nls library */
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 /* load default nls if none is specified in mount options */
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; /* UNKNOWN */
967 buf->f_ffree = 0; /* UNKNOWN */
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 * Macros that typecheck the init and exit functions,
1027 * ensures that they are called at init and cleanup,
1028 * and eliminates warnings about unused functions.
1029 */
1030module_init(init_befs_fs)
1031module_exit(exit_befs_fs)
1/*
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
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 *);
38static struct inode *befs_iget(struct super_block *, unsigned long);
39static 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);
43static void *befs_follow_link(struct dentry *, struct nameidata *);
44static void befs_put_link(struct dentry *, struct nameidata *, void *);
45static 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 *);
51static int befs_statfs(struct dentry *, struct kstatfs *);
52static int parse_options(char *, befs_mount_options *);
53
54static const struct super_operations befs_sops = {
55 .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,
60 .show_options = generic_show_options,
61};
62
63/* slab cache for befs_inode_info objects */
64static struct kmem_cache *befs_inode_cachep;
65
66static const struct file_operations befs_dir_operations = {
67 .read = generic_read_dir,
68 .readdir = befs_readdir,
69 .llseek = generic_file_llseek,
70};
71
72static const struct inode_operations befs_dir_inode_operations = {
73 .lookup = befs_lookup,
74};
75
76static const struct address_space_operations befs_aops = {
77 .readpage = befs_readpage,
78 .bmap = befs_bmap,
79};
80
81static const struct inode_operations befs_symlink_inode_operations = {
82 .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
201 inode = befs_iget(dir->i_sb, (ino_t) offset);
202 if (IS_ERR(inode))
203 return ERR_CAST(inode);
204
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{
215 struct inode *inode = filp->f_path.dentry->d_inode;
216 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;
225 const char *dirname = filp->f_path.dentry->d_name.name;
226
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,
280 GFP_KERNEL);
281 if (!bi)
282 return NULL;
283 return &bi->vfs_inode;
284}
285
286static void befs_i_callback(struct rcu_head *head)
287{
288 struct inode *inode = container_of(head, struct inode, i_rcu);
289 INIT_LIST_HEAD(&inode->i_dentry);
290 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
291}
292
293static void befs_destroy_inode(struct inode *inode)
294{
295 call_rcu(&inode->i_rcu, befs_i_callback);
296}
297
298static void init_once(void *foo)
299{
300 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
301
302 inode_init_once(&bi->vfs_inode);
303}
304
305static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
306{
307 struct buffer_head *bh = NULL;
308 befs_inode *raw_inode = NULL;
309
310 befs_sb_info *befs_sb = BEFS_SB(sb);
311 befs_inode_info *befs_ino = NULL;
312 struct inode *inode;
313 long ret = -EIO;
314
315 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino);
316
317 inode = iget_locked(sb, ino);
318 if (IS_ERR(inode))
319 return inode;
320 if (!(inode->i_state & I_NEW))
321 return inode;
322
323 befs_ino = BEFS_I(inode);
324
325 /* convert from vfs's inode number to befs's inode number */
326 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
327
328 befs_debug(sb, " real inode number [%u, %hu, %hu]",
329 befs_ino->i_inode_num.allocation_group,
330 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
331
332 bh = befs_bread(sb, inode->i_ino);
333 if (!bh) {
334 befs_error(sb, "unable to read inode block - "
335 "inode = %lu", inode->i_ino);
336 goto unacquire_none;
337 }
338
339 raw_inode = (befs_inode *) bh->b_data;
340
341 befs_dump_inode(sb, raw_inode);
342
343 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
344 befs_error(sb, "Bad inode: %lu", inode->i_ino);
345 goto unacquire_bh;
346 }
347
348 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
349
350 /*
351 * set uid and gid. But since current BeOS is single user OS, so
352 * you can change by "uid" or "gid" options.
353 */
354
355 inode->i_uid = befs_sb->mount_opts.use_uid ?
356 befs_sb->mount_opts.uid : (uid_t) fs32_to_cpu(sb, raw_inode->uid);
357 inode->i_gid = befs_sb->mount_opts.use_gid ?
358 befs_sb->mount_opts.gid : (gid_t) fs32_to_cpu(sb, raw_inode->gid);
359
360 inode->i_nlink = 1;
361
362 /*
363 * BEFS's time is 64 bits, but current VFS is 32 bits...
364 * BEFS don't have access time. Nor inode change time. VFS
365 * doesn't have creation time.
366 * Also, the lower 16 bits of the last_modified_time and
367 * create_time are just a counter to help ensure uniqueness
368 * for indexing purposes. (PFD, page 54)
369 */
370
371 inode->i_mtime.tv_sec =
372 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
373 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
374 inode->i_ctime = inode->i_mtime;
375 inode->i_atime = inode->i_mtime;
376
377 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
378 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
379 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
380 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
381
382 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
383 inode->i_size = 0;
384 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
385 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
386 BEFS_SYMLINK_LEN - 1);
387 befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0';
388 } else {
389 int num_blks;
390
391 befs_ino->i_data.ds =
392 fsds_to_cpu(sb, &raw_inode->data.datastream);
393
394 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
395 inode->i_blocks =
396 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
397 inode->i_size = befs_ino->i_data.ds.size;
398 }
399
400 inode->i_mapping->a_ops = &befs_aops;
401
402 if (S_ISREG(inode->i_mode)) {
403 inode->i_fop = &generic_ro_fops;
404 } else if (S_ISDIR(inode->i_mode)) {
405 inode->i_op = &befs_dir_inode_operations;
406 inode->i_fop = &befs_dir_operations;
407 } else if (S_ISLNK(inode->i_mode)) {
408 inode->i_op = &befs_symlink_inode_operations;
409 } else {
410 befs_error(sb, "Inode %lu is not a regular file, "
411 "directory or symlink. THAT IS WRONG! BeFS has no "
412 "on disk special files", inode->i_ino);
413 goto unacquire_bh;
414 }
415
416 brelse(bh);
417 befs_debug(sb, "<--- befs_read_inode()");
418 unlock_new_inode(inode);
419 return inode;
420
421 unacquire_bh:
422 brelse(bh);
423
424 unacquire_none:
425 iget_failed(inode);
426 befs_debug(sb, "<--- befs_read_inode() - Bad inode");
427 return ERR_PTR(ret);
428}
429
430/* Initialize the inode cache. Called at fs setup.
431 *
432 * Taken from NFS implementation by Al Viro.
433 */
434static int
435befs_init_inodecache(void)
436{
437 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
438 sizeof (struct befs_inode_info),
439 0, (SLAB_RECLAIM_ACCOUNT|
440 SLAB_MEM_SPREAD),
441 init_once);
442 if (befs_inode_cachep == NULL) {
443 printk(KERN_ERR "befs_init_inodecache: "
444 "Couldn't initialize inode slabcache\n");
445 return -ENOMEM;
446 }
447
448 return 0;
449}
450
451/* Called at fs teardown.
452 *
453 * Taken from NFS implementation by Al Viro.
454 */
455static void
456befs_destroy_inodecache(void)
457{
458 kmem_cache_destroy(befs_inode_cachep);
459}
460
461/*
462 * The inode of symbolic link is different to data stream.
463 * The data stream become link name. Unless the LONG_SYMLINK
464 * flag is set.
465 */
466static void *
467befs_follow_link(struct dentry *dentry, struct nameidata *nd)
468{
469 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
470 char *link;
471
472 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
473 struct super_block *sb = dentry->d_sb;
474 befs_data_stream *data = &befs_ino->i_data.ds;
475 befs_off_t len = data->size;
476
477 if (len == 0) {
478 befs_error(sb, "Long symlink with illegal length");
479 link = ERR_PTR(-EIO);
480 } else {
481 befs_debug(sb, "Follow long symlink");
482
483 link = kmalloc(len, GFP_NOFS);
484 if (!link) {
485 link = ERR_PTR(-ENOMEM);
486 } else if (befs_read_lsymlink(sb, data, link, len) != len) {
487 kfree(link);
488 befs_error(sb, "Failed to read entire long symlink");
489 link = ERR_PTR(-EIO);
490 } else {
491 link[len - 1] = '\0';
492 }
493 }
494 } else {
495 link = befs_ino->i_data.symlink;
496 }
497
498 nd_set_link(nd, link);
499 return NULL;
500}
501
502static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
503{
504 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
505 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
506 char *link = nd_get_link(nd);
507 if (!IS_ERR(link))
508 kfree(link);
509 }
510}
511
512/*
513 * UTF-8 to NLS charset convert routine
514 *
515 *
516 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
517 * the nls tables directly
518 */
519
520static int
521befs_utf2nls(struct super_block *sb, const char *in,
522 int in_len, char **out, int *out_len)
523{
524 struct nls_table *nls = BEFS_SB(sb)->nls;
525 int i, o;
526 unicode_t uni;
527 int unilen, utflen;
528 char *result;
529 /* The utf8->nls conversion won't make the final nls string bigger
530 * than the utf one, but if the string is pure ascii they'll have the
531 * same width and an extra char is needed to save the additional \0
532 */
533 int maxlen = in_len + 1;
534
535 befs_debug(sb, "---> utf2nls()");
536
537 if (!nls) {
538 befs_error(sb, "befs_utf2nls called with no NLS table loaded");
539 return -EINVAL;
540 }
541
542 *out = result = kmalloc(maxlen, GFP_NOFS);
543 if (!*out) {
544 befs_error(sb, "befs_utf2nls() cannot allocate memory");
545 *out_len = 0;
546 return -ENOMEM;
547 }
548
549 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
550
551 /* convert from UTF-8 to Unicode */
552 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
553 if (utflen < 0)
554 goto conv_err;
555
556 /* convert from Unicode to nls */
557 if (uni > MAX_WCHAR_T)
558 goto conv_err;
559 unilen = nls->uni2char(uni, &result[o], in_len - o);
560 if (unilen < 0)
561 goto conv_err;
562 }
563 result[o] = '\0';
564 *out_len = o;
565
566 befs_debug(sb, "<--- utf2nls()");
567
568 return o;
569
570 conv_err:
571 befs_error(sb, "Name using character set %s contains a character that "
572 "cannot be converted to unicode.", nls->charset);
573 befs_debug(sb, "<--- utf2nls()");
574 kfree(result);
575 return -EILSEQ;
576}
577
578/**
579 * befs_nls2utf - Convert NLS string to utf8 encodeing
580 * @sb: Superblock
581 * @src: Input string buffer in NLS format
582 * @srclen: Length of input string in bytes
583 * @dest: The output string in UTF-8 format
584 * @destlen: Length of the output buffer
585 *
586 * Converts input string @src, which is in the format of the loaded NLS map,
587 * into a utf8 string.
588 *
589 * The destination string @dest is allocated by this function and the caller is
590 * responsible for freeing it with kfree()
591 *
592 * On return, *@destlen is the length of @dest in bytes.
593 *
594 * On success, the return value is the number of utf8 characters written to
595 * the output buffer @dest.
596 *
597 * On Failure, a negative number coresponding to the error code is returned.
598 */
599
600static int
601befs_nls2utf(struct super_block *sb, const char *in,
602 int in_len, char **out, int *out_len)
603{
604 struct nls_table *nls = BEFS_SB(sb)->nls;
605 int i, o;
606 wchar_t uni;
607 int unilen, utflen;
608 char *result;
609 /* There're nls characters that will translate to 3-chars-wide UTF-8
610 * characters, a additional byte is needed to save the final \0
611 * in special cases */
612 int maxlen = (3 * in_len) + 1;
613
614 befs_debug(sb, "---> nls2utf()\n");
615
616 if (!nls) {
617 befs_error(sb, "befs_nls2utf called with no NLS table loaded.");
618 return -EINVAL;
619 }
620
621 *out = result = kmalloc(maxlen, GFP_NOFS);
622 if (!*out) {
623 befs_error(sb, "befs_nls2utf() cannot allocate memory");
624 *out_len = 0;
625 return -ENOMEM;
626 }
627
628 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
629
630 /* convert from nls to unicode */
631 unilen = nls->char2uni(&in[i], in_len - i, &uni);
632 if (unilen < 0)
633 goto conv_err;
634
635 /* convert from unicode to UTF-8 */
636 utflen = utf32_to_utf8(uni, &result[o], 3);
637 if (utflen <= 0)
638 goto conv_err;
639 }
640
641 result[o] = '\0';
642 *out_len = o;
643
644 befs_debug(sb, "<--- nls2utf()");
645
646 return i;
647
648 conv_err:
649 befs_error(sb, "Name using charecter set %s contains a charecter that "
650 "cannot be converted to unicode.", nls->charset);
651 befs_debug(sb, "<--- nls2utf()");
652 kfree(result);
653 return -EILSEQ;
654}
655
656/**
657 * Use the
658 *
659 */
660enum {
661 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
662};
663
664static const match_table_t befs_tokens = {
665 {Opt_uid, "uid=%d"},
666 {Opt_gid, "gid=%d"},
667 {Opt_charset, "iocharset=%s"},
668 {Opt_debug, "debug"},
669 {Opt_err, NULL}
670};
671
672static int
673parse_options(char *options, befs_mount_options * opts)
674{
675 char *p;
676 substring_t args[MAX_OPT_ARGS];
677 int option;
678
679 /* Initialize options */
680 opts->uid = 0;
681 opts->gid = 0;
682 opts->use_uid = 0;
683 opts->use_gid = 0;
684 opts->iocharset = NULL;
685 opts->debug = 0;
686
687 if (!options)
688 return 1;
689
690 while ((p = strsep(&options, ",")) != NULL) {
691 int token;
692 if (!*p)
693 continue;
694
695 token = match_token(p, befs_tokens, args);
696 switch (token) {
697 case Opt_uid:
698 if (match_int(&args[0], &option))
699 return 0;
700 if (option < 0) {
701 printk(KERN_ERR "BeFS: Invalid uid %d, "
702 "using default\n", option);
703 break;
704 }
705 opts->uid = option;
706 opts->use_uid = 1;
707 break;
708 case Opt_gid:
709 if (match_int(&args[0], &option))
710 return 0;
711 if (option < 0) {
712 printk(KERN_ERR "BeFS: Invalid gid %d, "
713 "using default\n", option);
714 break;
715 }
716 opts->gid = option;
717 opts->use_gid = 1;
718 break;
719 case Opt_charset:
720 kfree(opts->iocharset);
721 opts->iocharset = match_strdup(&args[0]);
722 if (!opts->iocharset) {
723 printk(KERN_ERR "BeFS: allocation failure for "
724 "iocharset string\n");
725 return 0;
726 }
727 break;
728 case Opt_debug:
729 opts->debug = 1;
730 break;
731 default:
732 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" "
733 "or missing value\n", p);
734 return 0;
735 }
736 }
737 return 1;
738}
739
740/* This function has the responsibiltiy of getting the
741 * filesystem ready for unmounting.
742 * Basically, we free everything that we allocated in
743 * befs_read_inode
744 */
745static void
746befs_put_super(struct super_block *sb)
747{
748 kfree(BEFS_SB(sb)->mount_opts.iocharset);
749 BEFS_SB(sb)->mount_opts.iocharset = NULL;
750 unload_nls(BEFS_SB(sb)->nls);
751 kfree(sb->s_fs_info);
752 sb->s_fs_info = NULL;
753}
754
755/* Allocate private field of the superblock, fill it.
756 *
757 * Finish filling the public superblock fields
758 * Make the root directory
759 * Load a set of NLS translations if needed.
760 */
761static int
762befs_fill_super(struct super_block *sb, void *data, int silent)
763{
764 struct buffer_head *bh;
765 befs_sb_info *befs_sb;
766 befs_super_block *disk_sb;
767 struct inode *root;
768 long ret = -EINVAL;
769 const unsigned long sb_block = 0;
770 const off_t x86_sb_off = 512;
771
772 save_mount_options(sb, data);
773
774 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL);
775 if (sb->s_fs_info == NULL) {
776 printk(KERN_ERR
777 "BeFS(%s): Unable to allocate memory for private "
778 "portion of superblock. Bailing.\n", sb->s_id);
779 goto unacquire_none;
780 }
781 befs_sb = BEFS_SB(sb);
782 memset(befs_sb, 0, sizeof(befs_sb_info));
783
784 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
785 befs_error(sb, "cannot parse mount options");
786 goto unacquire_priv_sbp;
787 }
788
789 befs_debug(sb, "---> befs_fill_super()");
790
791#ifndef CONFIG_BEFS_RW
792 if (!(sb->s_flags & MS_RDONLY)) {
793 befs_warning(sb,
794 "No write support. Marking filesystem read-only");
795 sb->s_flags |= MS_RDONLY;
796 }
797#endif /* CONFIG_BEFS_RW */
798
799 /*
800 * Set dummy blocksize to read super block.
801 * Will be set to real fs blocksize later.
802 *
803 * Linux 2.4.10 and later refuse to read blocks smaller than
804 * the hardsect size for the device. But we also need to read at
805 * least 1k to get the second 512 bytes of the volume.
806 * -WD 10-26-01
807 */
808 sb_min_blocksize(sb, 1024);
809
810 if (!(bh = sb_bread(sb, sb_block))) {
811 befs_error(sb, "unable to read superblock");
812 goto unacquire_priv_sbp;
813 }
814
815 /* account for offset of super block on x86 */
816 disk_sb = (befs_super_block *) bh->b_data;
817 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
818 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
819 befs_debug(sb, "Using PPC superblock location");
820 } else {
821 befs_debug(sb, "Using x86 superblock location");
822 disk_sb =
823 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
824 }
825
826 if (befs_load_sb(sb, disk_sb) != BEFS_OK)
827 goto unacquire_bh;
828
829 befs_dump_super_block(sb, disk_sb);
830
831 brelse(bh);
832
833 if (befs_check_sb(sb) != BEFS_OK)
834 goto unacquire_priv_sbp;
835
836 if( befs_sb->num_blocks > ~((sector_t)0) ) {
837 befs_error(sb, "blocks count: %Lu "
838 "is larger than the host can use",
839 befs_sb->num_blocks);
840 goto unacquire_priv_sbp;
841 }
842
843 /*
844 * set up enough so that it can read an inode
845 * Fill in kernel superblock fields from private sb
846 */
847 sb->s_magic = BEFS_SUPER_MAGIC;
848 /* Set real blocksize of fs */
849 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
850 sb->s_op = &befs_sops;
851 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
852 if (IS_ERR(root)) {
853 ret = PTR_ERR(root);
854 goto unacquire_priv_sbp;
855 }
856 sb->s_root = d_alloc_root(root);
857 if (!sb->s_root) {
858 iput(root);
859 befs_error(sb, "get root inode failed");
860 goto unacquire_priv_sbp;
861 }
862
863 /* load nls library */
864 if (befs_sb->mount_opts.iocharset) {
865 befs_debug(sb, "Loading nls: %s",
866 befs_sb->mount_opts.iocharset);
867 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
868 if (!befs_sb->nls) {
869 befs_warning(sb, "Cannot load nls %s"
870 " loading default nls",
871 befs_sb->mount_opts.iocharset);
872 befs_sb->nls = load_nls_default();
873 }
874 /* load default nls if none is specified in mount options */
875 } else {
876 befs_debug(sb, "Loading default nls");
877 befs_sb->nls = load_nls_default();
878 }
879
880 return 0;
881/*****************/
882 unacquire_bh:
883 brelse(bh);
884
885 unacquire_priv_sbp:
886 kfree(befs_sb->mount_opts.iocharset);
887 kfree(sb->s_fs_info);
888
889 unacquire_none:
890 sb->s_fs_info = NULL;
891 return ret;
892}
893
894static int
895befs_remount(struct super_block *sb, int *flags, char *data)
896{
897 if (!(*flags & MS_RDONLY))
898 return -EINVAL;
899 return 0;
900}
901
902static int
903befs_statfs(struct dentry *dentry, struct kstatfs *buf)
904{
905 struct super_block *sb = dentry->d_sb;
906 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
907
908 befs_debug(sb, "---> befs_statfs()");
909
910 buf->f_type = BEFS_SUPER_MAGIC;
911 buf->f_bsize = sb->s_blocksize;
912 buf->f_blocks = BEFS_SB(sb)->num_blocks;
913 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
914 buf->f_bavail = buf->f_bfree;
915 buf->f_files = 0; /* UNKNOWN */
916 buf->f_ffree = 0; /* UNKNOWN */
917 buf->f_fsid.val[0] = (u32)id;
918 buf->f_fsid.val[1] = (u32)(id >> 32);
919 buf->f_namelen = BEFS_NAME_LEN;
920
921 befs_debug(sb, "<--- befs_statfs()");
922
923 return 0;
924}
925
926static struct dentry *
927befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
928 void *data)
929{
930 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
931}
932
933static struct file_system_type befs_fs_type = {
934 .owner = THIS_MODULE,
935 .name = "befs",
936 .mount = befs_mount,
937 .kill_sb = kill_block_super,
938 .fs_flags = FS_REQUIRES_DEV,
939};
940
941static int __init
942init_befs_fs(void)
943{
944 int err;
945
946 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION);
947
948 err = befs_init_inodecache();
949 if (err)
950 goto unacquire_none;
951
952 err = register_filesystem(&befs_fs_type);
953 if (err)
954 goto unacquire_inodecache;
955
956 return 0;
957
958unacquire_inodecache:
959 befs_destroy_inodecache();
960
961unacquire_none:
962 return err;
963}
964
965static void __exit
966exit_befs_fs(void)
967{
968 befs_destroy_inodecache();
969
970 unregister_filesystem(&befs_fs_type);
971}
972
973/*
974Macros that typecheck the init and exit functions,
975ensures that they are called at init and cleanup,
976and eliminates warnings about unused functions.
977*/
978module_init(init_befs_fs)
979module_exit(exit_befs_fs)