blob: f95dddced968f6f4509f1536b80462baa1c4393b [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>
Eric W. Biederman31aba052012-02-10 10:51:24 -080018#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20#include "befs.h"
21#include "btree.h"
22#include "inode.h"
23#include "datastream.h"
24#include "super.h"
25#include "io.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
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);
Al Viro00cd8dd2012-06-10 17:13:09 -040038static struct dentry *befs_lookup(struct inode *, struct dentry *, unsigned int);
David Howells96eb5412008-02-07 00:15:31 -080039static struct inode *befs_iget(struct super_block *, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040static struct inode *befs_alloc_inode(struct super_block *sb);
41static void befs_destroy_inode(struct inode *inode);
42static int befs_init_inodecache(void);
43static void befs_destroy_inodecache(void);
Al Viro008b1502005-08-20 00:17:39 +010044static void *befs_follow_link(struct dentry *, struct nameidata *);
45static void befs_put_link(struct dentry *, struct nameidata *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046static int befs_utf2nls(struct super_block *sb, const char *in, int in_len,
47 char **out, int *out_len);
48static int befs_nls2utf(struct super_block *sb, const char *in, int in_len,
49 char **out, int *out_len);
50static void befs_put_super(struct super_block *);
51static int befs_remount(struct super_block *, int *, char *);
David Howells726c3342006-06-23 02:02:58 -070052static int befs_statfs(struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053static int parse_options(char *, befs_mount_options *);
54
55static const struct super_operations befs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 .alloc_inode = befs_alloc_inode, /* allocate a new inode */
57 .destroy_inode = befs_destroy_inode, /* deallocate an inode */
58 .put_super = befs_put_super, /* uninit super */
59 .statfs = befs_statfs, /* statfs */
60 .remount_fs = befs_remount,
Miklos Szeredi552c3c62008-02-08 04:21:38 -080061 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -070062};
63
64/* slab cache for befs_inode_info objects */
Christoph Lametere18b8902006-12-06 20:33:20 -080065static struct kmem_cache *befs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080067static const struct file_operations befs_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 .read = generic_read_dir,
69 .readdir = befs_readdir,
Al Viro59af1582008-08-24 07:24:41 -040070 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -070071};
72
Arjan van de Ven754661f2007-02-12 00:55:38 -080073static const struct inode_operations befs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 .lookup = befs_lookup,
75};
76
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070077static const struct address_space_operations befs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 .readpage = befs_readpage,
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 .bmap = befs_bmap,
80};
81
Arjan van de Ven754661f2007-02-12 00:55:38 -080082static const struct inode_operations befs_symlink_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 .readlink = generic_readlink,
84 .follow_link = befs_follow_link,
85 .put_link = befs_put_link,
86};
87
88/*
89 * Called by generic_file_read() to read a page of data
90 *
91 * In turn, simply calls a generic block read function and
92 * passes it the address of befs_get_block, for mapping file
93 * positions to disk blocks.
94 */
95static int
96befs_readpage(struct file *file, struct page *page)
97{
98 return block_read_full_page(page, befs_get_block);
99}
100
101static sector_t
102befs_bmap(struct address_space *mapping, sector_t block)
103{
104 return generic_block_bmap(mapping, block, befs_get_block);
105}
106
107/*
108 * Generic function to map a file position (block) to a
109 * disk offset (passed back in bh_result).
110 *
111 * Used by many higher level functions.
112 *
113 * Calls befs_fblock2brun() in datastream.c to do the real work.
114 *
115 * -WD 10-26-01
116 */
117
118static int
119befs_get_block(struct inode *inode, sector_t block,
120 struct buffer_head *bh_result, int create)
121{
122 struct super_block *sb = inode->i_sb;
123 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
124 befs_block_run run = BAD_IADDR;
125 int res = 0;
126 ulong disk_off;
127
128 befs_debug(sb, "---> befs_get_block() for inode %lu, block %ld",
129 inode->i_ino, block);
130
131 if (block < 0) {
132 befs_error(sb, "befs_get_block() was asked for a block "
133 "number less than zero: block %ld in inode %lu",
134 block, inode->i_ino);
135 return -EIO;
136 }
137
138 if (create) {
139 befs_error(sb, "befs_get_block() was asked to write to "
140 "block %ld in inode %lu", block, inode->i_ino);
141 return -EPERM;
142 }
143
144 res = befs_fblock2brun(sb, ds, block, &run);
145 if (res != BEFS_OK) {
146 befs_error(sb,
147 "<--- befs_get_block() for inode %lu, block "
148 "%ld ERROR", inode->i_ino, block);
149 return -EFBIG;
150 }
151
152 disk_off = (ulong) iaddr2blockno(sb, &run);
153
154 map_bh(bh_result, inode->i_sb, disk_off);
155
156 befs_debug(sb, "<--- befs_get_block() for inode %lu, block %ld, "
157 "disk address %lu", inode->i_ino, block, disk_off);
158
159 return 0;
160}
161
162static struct dentry *
Al Viro00cd8dd2012-06-10 17:13:09 -0400163befs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165 struct inode *inode = NULL;
166 struct super_block *sb = dir->i_sb;
167 befs_data_stream *ds = &BEFS_I(dir)->i_data.ds;
168 befs_off_t offset;
169 int ret;
170 int utfnamelen;
171 char *utfname;
172 const char *name = dentry->d_name.name;
173
174 befs_debug(sb, "---> befs_lookup() "
175 "name %s inode %ld", dentry->d_name.name, dir->i_ino);
176
177 /* Convert to UTF-8 */
178 if (BEFS_SB(sb)->nls) {
179 ret =
180 befs_nls2utf(sb, name, strlen(name), &utfname, &utfnamelen);
181 if (ret < 0) {
182 befs_debug(sb, "<--- befs_lookup() ERROR");
183 return ERR_PTR(ret);
184 }
185 ret = befs_btree_find(sb, ds, utfname, &offset);
186 kfree(utfname);
187
188 } else {
189 ret = befs_btree_find(sb, ds, dentry->d_name.name, &offset);
190 }
191
192 if (ret == BEFS_BT_NOT_FOUND) {
193 befs_debug(sb, "<--- befs_lookup() %s not found",
194 dentry->d_name.name);
195 return ERR_PTR(-ENOENT);
196
197 } else if (ret != BEFS_OK || offset == 0) {
198 befs_warning(sb, "<--- befs_lookup() Error");
199 return ERR_PTR(-ENODATA);
200 }
201
David Howells96eb5412008-02-07 00:15:31 -0800202 inode = befs_iget(dir->i_sb, (ino_t) offset);
203 if (IS_ERR(inode))
204 return ERR_CAST(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 d_add(dentry, inode);
207
208 befs_debug(sb, "<--- befs_lookup()");
209
210 return NULL;
211}
212
213static int
214befs_readdir(struct file *filp, void *dirent, filldir_t filldir)
215{
Al Viro496ad9a2013-01-23 17:07:38 -0500216 struct inode *inode = file_inode(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 struct super_block *sb = inode->i_sb;
218 befs_data_stream *ds = &BEFS_I(inode)->i_data.ds;
219 befs_off_t value;
220 int result;
221 size_t keysize;
222 unsigned char d_type;
223 char keybuf[BEFS_NAME_LEN + 1];
224 char *nlsname;
225 int nlsnamelen;
Josef Sipek28f375f2006-12-08 02:36:52 -0800226 const char *dirname = filp->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 befs_debug(sb, "---> befs_readdir() "
229 "name %s, inode %ld, filp->f_pos %Ld",
230 dirname, inode->i_ino, filp->f_pos);
231
232 result = befs_btree_read(sb, ds, filp->f_pos, BEFS_NAME_LEN + 1,
233 keybuf, &keysize, &value);
234
235 if (result == BEFS_ERR) {
236 befs_debug(sb, "<--- befs_readdir() ERROR");
237 befs_error(sb, "IO error reading %s (inode %lu)",
238 dirname, inode->i_ino);
239 return -EIO;
240
241 } else if (result == BEFS_BT_END) {
242 befs_debug(sb, "<--- befs_readdir() END");
243 return 0;
244
245 } else if (result == BEFS_BT_EMPTY) {
246 befs_debug(sb, "<--- befs_readdir() Empty directory");
247 return 0;
248 }
249
250 d_type = DT_UNKNOWN;
251
252 /* Convert to NLS */
253 if (BEFS_SB(sb)->nls) {
254 result =
255 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
256 if (result < 0) {
257 befs_debug(sb, "<--- befs_readdir() ERROR");
258 return result;
259 }
260 result = filldir(dirent, nlsname, nlsnamelen, filp->f_pos,
261 (ino_t) value, d_type);
262 kfree(nlsname);
263
264 } else {
265 result = filldir(dirent, keybuf, keysize, filp->f_pos,
266 (ino_t) value, d_type);
267 }
Al Viro448293a2013-05-22 13:41:26 -0400268 if (!result)
269 filp->f_pos++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 befs_debug(sb, "<--- befs_readdir() filp->f_pos %Ld", filp->f_pos);
272
273 return 0;
274}
275
276static struct inode *
277befs_alloc_inode(struct super_block *sb)
278{
279 struct befs_inode_info *bi;
280 bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep,
Christoph Lametere94b1762006-12-06 20:33:17 -0800281 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 if (!bi)
283 return NULL;
284 return &bi->vfs_inode;
285}
286
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100287static void befs_i_callback(struct rcu_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100289 struct inode *inode = container_of(head, struct inode, i_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
291}
292
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100293static void befs_destroy_inode(struct inode *inode)
294{
295 call_rcu(&inode->i_rcu, befs_i_callback);
296}
297
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700298static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
300 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
Christoph Lametera35afb82007-05-16 22:10:57 -0700301
302 inode_init_once(&bi->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303}
304
David Howells96eb5412008-02-07 00:15:31 -0800305static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
307 struct buffer_head *bh = NULL;
308 befs_inode *raw_inode = NULL;
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 befs_sb_info *befs_sb = BEFS_SB(sb);
311 befs_inode_info *befs_ino = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800312 struct inode *inode;
313 long ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
David Howells96eb5412008-02-07 00:15:31 -0800315 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
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);
Adrian Bunk04187262006-06-30 18:23:04 +0200336 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 }
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);
Adrian Bunk04187262006-06-30 18:23:04 +0200345 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 }
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 ?
Eric W. Biederman31aba052012-02-10 10:51:24 -0800356 befs_sb->mount_opts.uid :
357 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 inode->i_gid = befs_sb->mount_opts.use_gid ?
Eric W. Biederman31aba052012-02-10 10:51:24 -0800359 befs_sb->mount_opts.gid :
360 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Miklos Szeredibfe86842011-10-28 14:13:29 +0200362 set_nlink(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
364 /*
365 * BEFS's time is 64 bits, but current VFS is 32 bits...
366 * BEFS don't have access time. Nor inode change time. VFS
367 * doesn't have creation time.
368 * Also, the lower 16 bits of the last_modified_time and
369 * create_time are just a counter to help ensure uniqueness
370 * for indexing purposes. (PFD, page 54)
371 */
372
373 inode->i_mtime.tv_sec =
374 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
375 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
376 inode->i_ctime = inode->i_mtime;
377 inode->i_atime = inode->i_mtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
379 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
380 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
381 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
382 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
383
384 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
385 inode->i_size = 0;
386 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
387 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
Duane Griffin7df5fa02008-12-19 20:47:18 +0000388 BEFS_SYMLINK_LEN - 1);
389 befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 } else {
391 int num_blks;
392
393 befs_ino->i_data.ds =
Jesper Juhle0e3d322011-01-12 17:00:26 -0800394 fsds_to_cpu(sb, &raw_inode->data.datastream);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
396 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
397 inode->i_blocks =
398 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
399 inode->i_size = befs_ino->i_data.ds.size;
400 }
401
402 inode->i_mapping->a_ops = &befs_aops;
403
404 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig2cf06912005-11-07 00:59:44 -0800405 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 } else if (S_ISDIR(inode->i_mode)) {
407 inode->i_op = &befs_dir_inode_operations;
408 inode->i_fop = &befs_dir_operations;
409 } else if (S_ISLNK(inode->i_mode)) {
410 inode->i_op = &befs_symlink_inode_operations;
411 } else {
412 befs_error(sb, "Inode %lu is not a regular file, "
413 "directory or symlink. THAT IS WRONG! BeFS has no "
414 "on disk special files", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200415 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 }
417
418 brelse(bh);
419 befs_debug(sb, "<--- befs_read_inode()");
David Howells96eb5412008-02-07 00:15:31 -0800420 unlock_new_inode(inode);
421 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Adrian Bunk04187262006-06-30 18:23:04 +0200423 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 brelse(bh);
425
Adrian Bunk04187262006-06-30 18:23:04 +0200426 unacquire_none:
David Howells96eb5412008-02-07 00:15:31 -0800427 iget_failed(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 befs_debug(sb, "<--- befs_read_inode() - Bad inode");
David Howells96eb5412008-02-07 00:15:31 -0800429 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430}
431
432/* Initialize the inode cache. Called at fs setup.
Paul Mundt20c2df82007-07-20 10:11:58 +0900433 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 * Taken from NFS implementation by Al Viro.
435 */
436static int
437befs_init_inodecache(void)
438{
439 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
440 sizeof (struct befs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800441 0, (SLAB_RECLAIM_ACCOUNT|
442 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900443 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 if (befs_inode_cachep == NULL) {
445 printk(KERN_ERR "befs_init_inodecache: "
Uwe Kleine-König421f91d2010-06-11 12:17:00 +0200446 "Couldn't initialize inode slabcache\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 return -ENOMEM;
448 }
449
450 return 0;
451}
452
453/* Called at fs teardown.
454 *
455 * Taken from NFS implementation by Al Viro.
456 */
457static void
458befs_destroy_inodecache(void)
459{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000460 /*
461 * Make sure all delayed rcu free inodes are flushed before we
462 * destroy cache.
463 */
464 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700465 kmem_cache_destroy(befs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
468/*
469 * The inode of symbolic link is different to data stream.
470 * The data stream become link name. Unless the LONG_SYMLINK
471 * flag is set.
472 */
Linus Torvaldsdb873892005-08-20 13:20:01 -0700473static void *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474befs_follow_link(struct dentry *dentry, struct nameidata *nd)
475{
476 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
477 char *link;
478
479 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
480 struct super_block *sb = dentry->d_sb;
481 befs_data_stream *data = &befs_ino->i_data.ds;
482 befs_off_t len = data->size;
483
Timo Warns338d0f02011-08-17 17:59:56 +0200484 if (len == 0) {
485 befs_error(sb, "Long symlink with illegal length");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 link = ERR_PTR(-EIO);
Duane Griffin7df5fa02008-12-19 20:47:18 +0000487 } else {
Timo Warns338d0f02011-08-17 17:59:56 +0200488 befs_debug(sb, "Follow long symlink");
489
490 link = kmalloc(len, GFP_NOFS);
491 if (!link) {
492 link = ERR_PTR(-ENOMEM);
493 } else if (befs_read_lsymlink(sb, data, link, len) != len) {
494 kfree(link);
495 befs_error(sb, "Failed to read entire long symlink");
496 link = ERR_PTR(-EIO);
497 } else {
498 link[len - 1] = '\0';
499 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 }
501 } else {
502 link = befs_ino->i_data.symlink;
503 }
504
505 nd_set_link(nd, link);
Al Viro008b1502005-08-20 00:17:39 +0100506 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507}
508
Al Viro008b1502005-08-20 00:17:39 +0100509static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510{
511 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
512 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
Harvey Harrison63e34532008-04-29 00:58:44 -0700513 char *link = nd_get_link(nd);
514 if (!IS_ERR(link))
515 kfree(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 }
517}
518
519/*
520 * UTF-8 to NLS charset convert routine
521 *
522 *
523 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
524 * the nls tables directly
525 */
526
527static int
528befs_utf2nls(struct super_block *sb, const char *in,
529 int in_len, char **out, int *out_len)
530{
531 struct nls_table *nls = BEFS_SB(sb)->nls;
532 int i, o;
Alan Stern74675a52009-04-30 10:08:18 -0400533 unicode_t uni;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 int unilen, utflen;
535 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700536 /* The utf8->nls conversion won't make the final nls string bigger
537 * than the utf one, but if the string is pure ascii they'll have the
538 * same width and an extra char is needed to save the additional \0
539 */
540 int maxlen = in_len + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542 befs_debug(sb, "---> utf2nls()");
543
544 if (!nls) {
545 befs_error(sb, "befs_utf2nls called with no NLS table loaded");
546 return -EINVAL;
547 }
548
549 *out = result = kmalloc(maxlen, GFP_NOFS);
550 if (!*out) {
551 befs_error(sb, "befs_utf2nls() cannot allocate memory");
552 *out_len = 0;
553 return -ENOMEM;
554 }
555
556 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
557
558 /* convert from UTF-8 to Unicode */
Alan Stern74675a52009-04-30 10:08:18 -0400559 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
560 if (utflen < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562
563 /* convert from Unicode to nls */
Alan Stern74675a52009-04-30 10:08:18 -0400564 if (uni > MAX_WCHAR_T)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 goto conv_err;
Alan Stern74675a52009-04-30 10:08:18 -0400566 unilen = nls->uni2char(uni, &result[o], in_len - o);
567 if (unilen < 0)
568 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 }
570 result[o] = '\0';
571 *out_len = o;
572
573 befs_debug(sb, "<--- utf2nls()");
574
575 return o;
576
577 conv_err:
578 befs_error(sb, "Name using character set %s contains a character that "
579 "cannot be converted to unicode.", nls->charset);
580 befs_debug(sb, "<--- utf2nls()");
581 kfree(result);
582 return -EILSEQ;
583}
584
585/**
586 * befs_nls2utf - Convert NLS string to utf8 encodeing
587 * @sb: Superblock
588 * @src: Input string buffer in NLS format
589 * @srclen: Length of input string in bytes
Alexey Dobriyan4de151d2006-03-22 00:13:35 +0100590 * @dest: The output string in UTF-8 format
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 * @destlen: Length of the output buffer
592 *
593 * Converts input string @src, which is in the format of the loaded NLS map,
594 * into a utf8 string.
595 *
596 * The destination string @dest is allocated by this function and the caller is
597 * responsible for freeing it with kfree()
598 *
599 * On return, *@destlen is the length of @dest in bytes.
600 *
601 * On success, the return value is the number of utf8 characters written to
602 * the output buffer @dest.
603 *
604 * On Failure, a negative number coresponding to the error code is returned.
605 */
606
607static int
608befs_nls2utf(struct super_block *sb, const char *in,
609 int in_len, char **out, int *out_len)
610{
611 struct nls_table *nls = BEFS_SB(sb)->nls;
612 int i, o;
613 wchar_t uni;
614 int unilen, utflen;
615 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700616 /* There're nls characters that will translate to 3-chars-wide UTF-8
617 * characters, a additional byte is needed to save the final \0
618 * in special cases */
619 int maxlen = (3 * in_len) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
621 befs_debug(sb, "---> nls2utf()\n");
622
623 if (!nls) {
624 befs_error(sb, "befs_nls2utf called with no NLS table loaded.");
625 return -EINVAL;
626 }
627
628 *out = result = kmalloc(maxlen, GFP_NOFS);
629 if (!*out) {
630 befs_error(sb, "befs_nls2utf() cannot allocate memory");
631 *out_len = 0;
632 return -ENOMEM;
633 }
634
635 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
636
637 /* convert from nls to unicode */
638 unilen = nls->char2uni(&in[i], in_len - i, &uni);
Alan Stern74675a52009-04-30 10:08:18 -0400639 if (unilen < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642 /* convert from unicode to UTF-8 */
Alan Stern74675a52009-04-30 10:08:18 -0400643 utflen = utf32_to_utf8(uni, &result[o], 3);
644 if (utflen <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 }
647
648 result[o] = '\0';
649 *out_len = o;
650
651 befs_debug(sb, "<--- nls2utf()");
652
653 return i;
654
655 conv_err:
656 befs_error(sb, "Name using charecter set %s contains a charecter that "
657 "cannot be converted to unicode.", nls->charset);
658 befs_debug(sb, "<--- nls2utf()");
659 kfree(result);
660 return -EILSEQ;
661}
662
663/**
664 * Use the
665 *
666 */
667enum {
668 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
669};
670
Steven Whitehousea447c092008-10-13 10:46:57 +0100671static const match_table_t befs_tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 {Opt_uid, "uid=%d"},
673 {Opt_gid, "gid=%d"},
674 {Opt_charset, "iocharset=%s"},
675 {Opt_debug, "debug"},
676 {Opt_err, NULL}
677};
678
679static int
680parse_options(char *options, befs_mount_options * opts)
681{
682 char *p;
683 substring_t args[MAX_OPT_ARGS];
684 int option;
Eric W. Biederman31aba052012-02-10 10:51:24 -0800685 kuid_t uid;
686 kgid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687
688 /* Initialize options */
Eric W. Biederman31aba052012-02-10 10:51:24 -0800689 opts->uid = GLOBAL_ROOT_UID;
690 opts->gid = GLOBAL_ROOT_GID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 opts->use_uid = 0;
692 opts->use_gid = 0;
693 opts->iocharset = NULL;
694 opts->debug = 0;
695
696 if (!options)
697 return 1;
698
699 while ((p = strsep(&options, ",")) != NULL) {
700 int token;
701 if (!*p)
702 continue;
703
704 token = match_token(p, befs_tokens, args);
705 switch (token) {
706 case Opt_uid:
707 if (match_int(&args[0], &option))
708 return 0;
Eric W. Biederman31aba052012-02-10 10:51:24 -0800709 uid = INVALID_UID;
710 if (option >= 0)
711 uid = make_kuid(current_user_ns(), option);
712 if (!uid_valid(uid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 printk(KERN_ERR "BeFS: Invalid uid %d, "
714 "using default\n", option);
715 break;
716 }
Eric W. Biederman31aba052012-02-10 10:51:24 -0800717 opts->uid = uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 opts->use_uid = 1;
719 break;
720 case Opt_gid:
721 if (match_int(&args[0], &option))
722 return 0;
Eric W. Biederman31aba052012-02-10 10:51:24 -0800723 gid = INVALID_GID;
724 if (option >= 0)
725 gid = make_kgid(current_user_ns(), option);
726 if (!gid_valid(gid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 printk(KERN_ERR "BeFS: Invalid gid %d, "
728 "using default\n", option);
729 break;
730 }
Eric W. Biederman31aba052012-02-10 10:51:24 -0800731 opts->gid = gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 opts->use_gid = 1;
733 break;
734 case Opt_charset:
735 kfree(opts->iocharset);
736 opts->iocharset = match_strdup(&args[0]);
737 if (!opts->iocharset) {
738 printk(KERN_ERR "BeFS: allocation failure for "
739 "iocharset string\n");
740 return 0;
741 }
742 break;
743 case Opt_debug:
744 opts->debug = 1;
745 break;
746 default:
747 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" "
748 "or missing value\n", p);
749 return 0;
750 }
751 }
752 return 1;
753}
754
755/* This function has the responsibiltiy of getting the
756 * filesystem ready for unmounting.
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300757 * Basically, we free everything that we allocated in
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 * befs_read_inode
759 */
760static void
761befs_put_super(struct super_block *sb)
762{
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800763 kfree(BEFS_SB(sb)->mount_opts.iocharset);
764 BEFS_SB(sb)->mount_opts.iocharset = NULL;
Thomas Gleixner6d729e42009-08-16 21:05:08 +0000765 unload_nls(BEFS_SB(sb)->nls);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800766 kfree(sb->s_fs_info);
767 sb->s_fs_info = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768}
769
770/* Allocate private field of the superblock, fill it.
771 *
772 * Finish filling the public superblock fields
773 * Make the root directory
774 * Load a set of NLS translations if needed.
775 */
776static int
777befs_fill_super(struct super_block *sb, void *data, int silent)
778{
779 struct buffer_head *bh;
780 befs_sb_info *befs_sb;
781 befs_super_block *disk_sb;
782 struct inode *root;
David Howells96eb5412008-02-07 00:15:31 -0800783 long ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 const unsigned long sb_block = 0;
785 const off_t x86_sb_off = 512;
786
Miklos Szeredi552c3c62008-02-08 04:21:38 -0800787 save_mount_options(sb, data);
788
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL);
790 if (sb->s_fs_info == NULL) {
791 printk(KERN_ERR
792 "BeFS(%s): Unable to allocate memory for private "
793 "portion of superblock. Bailing.\n", sb->s_id);
Adrian Bunk04187262006-06-30 18:23:04 +0200794 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 }
796 befs_sb = BEFS_SB(sb);
797 memset(befs_sb, 0, sizeof(befs_sb_info));
798
799 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
800 befs_error(sb, "cannot parse mount options");
Adrian Bunk04187262006-06-30 18:23:04 +0200801 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 }
803
804 befs_debug(sb, "---> befs_fill_super()");
805
806#ifndef CONFIG_BEFS_RW
807 if (!(sb->s_flags & MS_RDONLY)) {
808 befs_warning(sb,
809 "No write support. Marking filesystem read-only");
810 sb->s_flags |= MS_RDONLY;
811 }
812#endif /* CONFIG_BEFS_RW */
813
814 /*
815 * Set dummy blocksize to read super block.
816 * Will be set to real fs blocksize later.
817 *
818 * Linux 2.4.10 and later refuse to read blocks smaller than
819 * the hardsect size for the device. But we also need to read at
820 * least 1k to get the second 512 bytes of the volume.
821 * -WD 10-26-01
822 */
823 sb_min_blocksize(sb, 1024);
824
825 if (!(bh = sb_bread(sb, sb_block))) {
826 befs_error(sb, "unable to read superblock");
Adrian Bunk04187262006-06-30 18:23:04 +0200827 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 }
829
830 /* account for offset of super block on x86 */
831 disk_sb = (befs_super_block *) bh->b_data;
Harvey Harrison152b95a2008-10-15 22:04:03 -0700832 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
833 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 befs_debug(sb, "Using PPC superblock location");
835 } else {
836 befs_debug(sb, "Using x86 superblock location");
837 disk_sb =
838 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
839 }
840
841 if (befs_load_sb(sb, disk_sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200842 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
844 befs_dump_super_block(sb, disk_sb);
845
846 brelse(bh);
847
848 if (befs_check_sb(sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200849 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
851 if( befs_sb->num_blocks > ~((sector_t)0) ) {
852 befs_error(sb, "blocks count: %Lu "
853 "is larger than the host can use",
854 befs_sb->num_blocks);
Adrian Bunk04187262006-06-30 18:23:04 +0200855 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 }
857
858 /*
859 * set up enough so that it can read an inode
860 * Fill in kernel superblock fields from private sb
861 */
862 sb->s_magic = BEFS_SUPER_MAGIC;
863 /* Set real blocksize of fs */
864 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700865 sb->s_op = &befs_sops;
David Howells96eb5412008-02-07 00:15:31 -0800866 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
867 if (IS_ERR(root)) {
868 ret = PTR_ERR(root);
869 goto unacquire_priv_sbp;
870 }
Al Viro48fde702012-01-08 22:15:13 -0500871 sb->s_root = d_make_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 if (!sb->s_root) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 befs_error(sb, "get root inode failed");
Adrian Bunk04187262006-06-30 18:23:04 +0200874 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 }
876
877 /* load nls library */
878 if (befs_sb->mount_opts.iocharset) {
879 befs_debug(sb, "Loading nls: %s",
880 befs_sb->mount_opts.iocharset);
881 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
882 if (!befs_sb->nls) {
883 befs_warning(sb, "Cannot load nls %s"
884 " loading default nls",
885 befs_sb->mount_opts.iocharset);
886 befs_sb->nls = load_nls_default();
887 }
888 /* load default nls if none is specified in mount options */
889 } else {
890 befs_debug(sb, "Loading default nls");
891 befs_sb->nls = load_nls_default();
892 }
893
894 return 0;
895/*****************/
Adrian Bunk04187262006-06-30 18:23:04 +0200896 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 brelse(bh);
898
Adrian Bunk04187262006-06-30 18:23:04 +0200899 unacquire_priv_sbp:
Al Viro8dd5ca52010-01-28 22:11:38 -0500900 kfree(befs_sb->mount_opts.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 kfree(sb->s_fs_info);
902
Adrian Bunk04187262006-06-30 18:23:04 +0200903 unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 sb->s_fs_info = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800905 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906}
907
908static int
909befs_remount(struct super_block *sb, int *flags, char *data)
910{
911 if (!(*flags & MS_RDONLY))
912 return -EINVAL;
913 return 0;
914}
915
916static int
David Howells726c3342006-06-23 02:02:58 -0700917befs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918{
David Howells726c3342006-06-23 02:02:58 -0700919 struct super_block *sb = dentry->d_sb;
Coly Li85872462009-04-02 16:59:32 -0700920 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
922 befs_debug(sb, "---> befs_statfs()");
923
924 buf->f_type = BEFS_SUPER_MAGIC;
925 buf->f_bsize = sb->s_blocksize;
926 buf->f_blocks = BEFS_SB(sb)->num_blocks;
927 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
928 buf->f_bavail = buf->f_bfree;
929 buf->f_files = 0; /* UNKNOWN */
930 buf->f_ffree = 0; /* UNKNOWN */
Coly Li85872462009-04-02 16:59:32 -0700931 buf->f_fsid.val[0] = (u32)id;
932 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 buf->f_namelen = BEFS_NAME_LEN;
934
935 befs_debug(sb, "<--- befs_statfs()");
936
937 return 0;
938}
939
Al Viro152a0832010-07-25 00:46:55 +0400940static struct dentry *
941befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
942 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943{
Al Viro152a0832010-07-25 00:46:55 +0400944 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945}
946
947static struct file_system_type befs_fs_type = {
948 .owner = THIS_MODULE,
949 .name = "befs",
Al Viro152a0832010-07-25 00:46:55 +0400950 .mount = befs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 .kill_sb = kill_block_super,
952 .fs_flags = FS_REQUIRES_DEV,
953};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800954MODULE_ALIAS_FS("befs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
956static int __init
957init_befs_fs(void)
958{
959 int err;
960
961 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION);
962
963 err = befs_init_inodecache();
964 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200965 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
967 err = register_filesystem(&befs_fs_type);
968 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200969 goto unacquire_inodecache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
971 return 0;
972
Adrian Bunk04187262006-06-30 18:23:04 +0200973unacquire_inodecache:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 befs_destroy_inodecache();
975
Adrian Bunk04187262006-06-30 18:23:04 +0200976unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 return err;
978}
979
980static void __exit
981exit_befs_fs(void)
982{
983 befs_destroy_inodecache();
984
985 unregister_filesystem(&befs_fs_type);
986}
987
988/*
989Macros that typecheck the init and exit functions,
990ensures that they are called at init and cleanup,
991and eliminates warnings about unused functions.
992*/
993module_init(init_befs_fs)
994module_exit(exit_befs_fs)