blob: e9c75e20db32d43b550506f5f8f62b2656f760e7 [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
Al Virof0f49ef2013-05-22 13:44:05 -040034static int befs_readdir(struct file *, struct dir_context *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035static 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,
Al Virof0f49ef2013-05-22 13:44:05 -040069 .iterate = 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
Al Virof0f49ef2013-05-22 13:44:05 -0400214befs_readdir(struct file *file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215{
Al Virof0f49ef2013-05-22 13:44:05 -0400216 struct inode *inode = file_inode(file);
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];
Al Virof0f49ef2013-05-22 13:44:05 -0400224 const char *dirname = file->f_path.dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 befs_debug(sb, "---> befs_readdir() "
Al Virof0f49ef2013-05-22 13:44:05 -0400227 "name %s, inode %ld, ctx->pos %Ld",
228 dirname, inode->i_ino, ctx->pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
Al Virof0f49ef2013-05-22 13:44:05 -0400230more:
231 result = befs_btree_read(sb, ds, ctx->pos, BEFS_NAME_LEN + 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 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) {
Al Virof0f49ef2013-05-22 13:44:05 -0400253 char *nlsname;
254 int nlsnamelen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 result =
256 befs_utf2nls(sb, keybuf, keysize, &nlsname, &nlsnamelen);
257 if (result < 0) {
258 befs_debug(sb, "<--- befs_readdir() ERROR");
259 return result;
260 }
Al Virof0f49ef2013-05-22 13:44:05 -0400261 if (!dir_emit(ctx, nlsname, nlsnamelen,
262 (ino_t) value, d_type)) {
263 kfree(nlsname);
264 return 0;
265 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 kfree(nlsname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 } else {
Al Virof0f49ef2013-05-22 13:44:05 -0400268 if (!dir_emit(ctx, keybuf, keysize,
269 (ino_t) value, d_type))
270 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 }
Al Virof0f49ef2013-05-22 13:44:05 -0400272 ctx->pos++;
273 goto more;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274
Al Virof0f49ef2013-05-22 13:44:05 -0400275 befs_debug(sb, "<--- befs_readdir() pos %Ld", ctx->pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277 return 0;
278}
279
280static struct inode *
281befs_alloc_inode(struct super_block *sb)
282{
283 struct befs_inode_info *bi;
284 bi = (struct befs_inode_info *)kmem_cache_alloc(befs_inode_cachep,
Christoph Lametere94b1762006-12-06 20:33:17 -0800285 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 if (!bi)
287 return NULL;
288 return &bi->vfs_inode;
289}
290
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100291static void befs_i_callback(struct rcu_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100293 struct inode *inode = container_of(head, struct inode, i_rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
295}
296
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100297static void befs_destroy_inode(struct inode *inode)
298{
299 call_rcu(&inode->i_rcu, befs_i_callback);
300}
301
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700302static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
304 struct befs_inode_info *bi = (struct befs_inode_info *) foo;
Christoph Lametera35afb82007-05-16 22:10:57 -0700305
306 inode_init_once(&bi->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307}
308
David Howells96eb5412008-02-07 00:15:31 -0800309static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310{
311 struct buffer_head *bh = NULL;
312 befs_inode *raw_inode = NULL;
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 befs_sb_info *befs_sb = BEFS_SB(sb);
315 befs_inode_info *befs_ino = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800316 struct inode *inode;
317 long ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
David Howells96eb5412008-02-07 00:15:31 -0800319 befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino);
320
321 inode = iget_locked(sb, ino);
322 if (IS_ERR(inode))
323 return inode;
324 if (!(inode->i_state & I_NEW))
325 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 befs_ino = BEFS_I(inode);
328
329 /* convert from vfs's inode number to befs's inode number */
330 befs_ino->i_inode_num = blockno2iaddr(sb, inode->i_ino);
331
332 befs_debug(sb, " real inode number [%u, %hu, %hu]",
333 befs_ino->i_inode_num.allocation_group,
334 befs_ino->i_inode_num.start, befs_ino->i_inode_num.len);
335
336 bh = befs_bread(sb, inode->i_ino);
337 if (!bh) {
338 befs_error(sb, "unable to read inode block - "
339 "inode = %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200340 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 }
342
343 raw_inode = (befs_inode *) bh->b_data;
344
345 befs_dump_inode(sb, raw_inode);
346
347 if (befs_check_inode(sb, raw_inode, inode->i_ino) != BEFS_OK) {
348 befs_error(sb, "Bad inode: %lu", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200349 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 }
351
352 inode->i_mode = (umode_t) fs32_to_cpu(sb, raw_inode->mode);
353
354 /*
355 * set uid and gid. But since current BeOS is single user OS, so
356 * you can change by "uid" or "gid" options.
357 */
358
359 inode->i_uid = befs_sb->mount_opts.use_uid ?
Eric W. Biederman31aba052012-02-10 10:51:24 -0800360 befs_sb->mount_opts.uid :
361 make_kuid(&init_user_ns, fs32_to_cpu(sb, raw_inode->uid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 inode->i_gid = befs_sb->mount_opts.use_gid ?
Eric W. Biederman31aba052012-02-10 10:51:24 -0800363 befs_sb->mount_opts.gid :
364 make_kgid(&init_user_ns, fs32_to_cpu(sb, raw_inode->gid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Miklos Szeredibfe86842011-10-28 14:13:29 +0200366 set_nlink(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
368 /*
369 * BEFS's time is 64 bits, but current VFS is 32 bits...
370 * BEFS don't have access time. Nor inode change time. VFS
371 * doesn't have creation time.
372 * Also, the lower 16 bits of the last_modified_time and
373 * create_time are just a counter to help ensure uniqueness
374 * for indexing purposes. (PFD, page 54)
375 */
376
377 inode->i_mtime.tv_sec =
378 fs64_to_cpu(sb, raw_inode->last_modified_time) >> 16;
379 inode->i_mtime.tv_nsec = 0; /* lower 16 bits are not a time */
380 inode->i_ctime = inode->i_mtime;
381 inode->i_atime = inode->i_mtime;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
383 befs_ino->i_inode_num = fsrun_to_cpu(sb, raw_inode->inode_num);
384 befs_ino->i_parent = fsrun_to_cpu(sb, raw_inode->parent);
385 befs_ino->i_attribute = fsrun_to_cpu(sb, raw_inode->attributes);
386 befs_ino->i_flags = fs32_to_cpu(sb, raw_inode->flags);
387
388 if (S_ISLNK(inode->i_mode) && !(befs_ino->i_flags & BEFS_LONG_SYMLINK)){
389 inode->i_size = 0;
390 inode->i_blocks = befs_sb->block_size / VFS_BLOCK_SIZE;
391 strncpy(befs_ino->i_data.symlink, raw_inode->data.symlink,
Duane Griffin7df5fa02008-12-19 20:47:18 +0000392 BEFS_SYMLINK_LEN - 1);
393 befs_ino->i_data.symlink[BEFS_SYMLINK_LEN - 1] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 } else {
395 int num_blks;
396
397 befs_ino->i_data.ds =
Jesper Juhle0e3d322011-01-12 17:00:26 -0800398 fsds_to_cpu(sb, &raw_inode->data.datastream);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400 num_blks = befs_count_blocks(sb, &befs_ino->i_data.ds);
401 inode->i_blocks =
402 num_blks * (befs_sb->block_size / VFS_BLOCK_SIZE);
403 inode->i_size = befs_ino->i_data.ds.size;
404 }
405
406 inode->i_mapping->a_ops = &befs_aops;
407
408 if (S_ISREG(inode->i_mode)) {
Christoph Hellwig2cf06912005-11-07 00:59:44 -0800409 inode->i_fop = &generic_ro_fops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 } else if (S_ISDIR(inode->i_mode)) {
411 inode->i_op = &befs_dir_inode_operations;
412 inode->i_fop = &befs_dir_operations;
413 } else if (S_ISLNK(inode->i_mode)) {
414 inode->i_op = &befs_symlink_inode_operations;
415 } else {
416 befs_error(sb, "Inode %lu is not a regular file, "
417 "directory or symlink. THAT IS WRONG! BeFS has no "
418 "on disk special files", inode->i_ino);
Adrian Bunk04187262006-06-30 18:23:04 +0200419 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 }
421
422 brelse(bh);
423 befs_debug(sb, "<--- befs_read_inode()");
David Howells96eb5412008-02-07 00:15:31 -0800424 unlock_new_inode(inode);
425 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Adrian Bunk04187262006-06-30 18:23:04 +0200427 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 brelse(bh);
429
Adrian Bunk04187262006-06-30 18:23:04 +0200430 unacquire_none:
David Howells96eb5412008-02-07 00:15:31 -0800431 iget_failed(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 befs_debug(sb, "<--- befs_read_inode() - Bad inode");
David Howells96eb5412008-02-07 00:15:31 -0800433 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434}
435
436/* Initialize the inode cache. Called at fs setup.
Paul Mundt20c2df82007-07-20 10:11:58 +0900437 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 * Taken from NFS implementation by Al Viro.
439 */
440static int
441befs_init_inodecache(void)
442{
443 befs_inode_cachep = kmem_cache_create("befs_inode_cache",
444 sizeof (struct befs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800445 0, (SLAB_RECLAIM_ACCOUNT|
446 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900447 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 if (befs_inode_cachep == NULL) {
449 printk(KERN_ERR "befs_init_inodecache: "
Uwe Kleine-König421f91d2010-06-11 12:17:00 +0200450 "Couldn't initialize inode slabcache\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 return -ENOMEM;
452 }
453
454 return 0;
455}
456
457/* Called at fs teardown.
458 *
459 * Taken from NFS implementation by Al Viro.
460 */
461static void
462befs_destroy_inodecache(void)
463{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000464 /*
465 * Make sure all delayed rcu free inodes are flushed before we
466 * destroy cache.
467 */
468 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700469 kmem_cache_destroy(befs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470}
471
472/*
473 * The inode of symbolic link is different to data stream.
474 * The data stream become link name. Unless the LONG_SYMLINK
475 * flag is set.
476 */
Linus Torvaldsdb873892005-08-20 13:20:01 -0700477static void *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478befs_follow_link(struct dentry *dentry, struct nameidata *nd)
479{
480 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
481 char *link;
482
483 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
484 struct super_block *sb = dentry->d_sb;
485 befs_data_stream *data = &befs_ino->i_data.ds;
486 befs_off_t len = data->size;
487
Timo Warns338d0f02011-08-17 17:59:56 +0200488 if (len == 0) {
489 befs_error(sb, "Long symlink with illegal length");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 link = ERR_PTR(-EIO);
Duane Griffin7df5fa02008-12-19 20:47:18 +0000491 } else {
Timo Warns338d0f02011-08-17 17:59:56 +0200492 befs_debug(sb, "Follow long symlink");
493
494 link = kmalloc(len, GFP_NOFS);
495 if (!link) {
496 link = ERR_PTR(-ENOMEM);
497 } else if (befs_read_lsymlink(sb, data, link, len) != len) {
498 kfree(link);
499 befs_error(sb, "Failed to read entire long symlink");
500 link = ERR_PTR(-EIO);
501 } else {
502 link[len - 1] = '\0';
503 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 }
505 } else {
506 link = befs_ino->i_data.symlink;
507 }
508
509 nd_set_link(nd, link);
Al Viro008b1502005-08-20 00:17:39 +0100510 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511}
512
Al Viro008b1502005-08-20 00:17:39 +0100513static void befs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514{
515 befs_inode_info *befs_ino = BEFS_I(dentry->d_inode);
516 if (befs_ino->i_flags & BEFS_LONG_SYMLINK) {
Harvey Harrison63e34532008-04-29 00:58:44 -0700517 char *link = nd_get_link(nd);
518 if (!IS_ERR(link))
519 kfree(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 }
521}
522
523/*
524 * UTF-8 to NLS charset convert routine
525 *
526 *
527 * Changed 8/10/01 by Will Dyson. Now use uni2char() / char2uni() rather than
528 * the nls tables directly
529 */
530
531static int
532befs_utf2nls(struct super_block *sb, const char *in,
533 int in_len, char **out, int *out_len)
534{
535 struct nls_table *nls = BEFS_SB(sb)->nls;
536 int i, o;
Alan Stern74675a52009-04-30 10:08:18 -0400537 unicode_t uni;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 int unilen, utflen;
539 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700540 /* The utf8->nls conversion won't make the final nls string bigger
541 * than the utf one, but if the string is pure ascii they'll have the
542 * same width and an extra char is needed to save the additional \0
543 */
544 int maxlen = in_len + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
546 befs_debug(sb, "---> utf2nls()");
547
548 if (!nls) {
549 befs_error(sb, "befs_utf2nls called with no NLS table loaded");
550 return -EINVAL;
551 }
552
553 *out = result = kmalloc(maxlen, GFP_NOFS);
554 if (!*out) {
555 befs_error(sb, "befs_utf2nls() cannot allocate memory");
556 *out_len = 0;
557 return -ENOMEM;
558 }
559
560 for (i = o = 0; i < in_len; i += utflen, o += unilen) {
561
562 /* convert from UTF-8 to Unicode */
Alan Stern74675a52009-04-30 10:08:18 -0400563 utflen = utf8_to_utf32(&in[i], in_len - i, &uni);
564 if (utflen < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
567 /* convert from Unicode to nls */
Alan Stern74675a52009-04-30 10:08:18 -0400568 if (uni > MAX_WCHAR_T)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 goto conv_err;
Alan Stern74675a52009-04-30 10:08:18 -0400570 unilen = nls->uni2char(uni, &result[o], in_len - o);
571 if (unilen < 0)
572 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 }
574 result[o] = '\0';
575 *out_len = o;
576
577 befs_debug(sb, "<--- utf2nls()");
578
579 return o;
580
581 conv_err:
582 befs_error(sb, "Name using character set %s contains a character that "
583 "cannot be converted to unicode.", nls->charset);
584 befs_debug(sb, "<--- utf2nls()");
585 kfree(result);
586 return -EILSEQ;
587}
588
589/**
590 * befs_nls2utf - Convert NLS string to utf8 encodeing
591 * @sb: Superblock
592 * @src: Input string buffer in NLS format
593 * @srclen: Length of input string in bytes
Alexey Dobriyan4de151d2006-03-22 00:13:35 +0100594 * @dest: The output string in UTF-8 format
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 * @destlen: Length of the output buffer
596 *
597 * Converts input string @src, which is in the format of the loaded NLS map,
598 * into a utf8 string.
599 *
600 * The destination string @dest is allocated by this function and the caller is
601 * responsible for freeing it with kfree()
602 *
603 * On return, *@destlen is the length of @dest in bytes.
604 *
605 * On success, the return value is the number of utf8 characters written to
606 * the output buffer @dest.
607 *
608 * On Failure, a negative number coresponding to the error code is returned.
609 */
610
611static int
612befs_nls2utf(struct super_block *sb, const char *in,
613 int in_len, char **out, int *out_len)
614{
615 struct nls_table *nls = BEFS_SB(sb)->nls;
616 int i, o;
617 wchar_t uni;
618 int unilen, utflen;
619 char *result;
Diego Calleja94f563c2006-08-05 12:14:55 -0700620 /* There're nls characters that will translate to 3-chars-wide UTF-8
621 * characters, a additional byte is needed to save the final \0
622 * in special cases */
623 int maxlen = (3 * in_len) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624
625 befs_debug(sb, "---> nls2utf()\n");
626
627 if (!nls) {
628 befs_error(sb, "befs_nls2utf called with no NLS table loaded.");
629 return -EINVAL;
630 }
631
632 *out = result = kmalloc(maxlen, GFP_NOFS);
633 if (!*out) {
634 befs_error(sb, "befs_nls2utf() cannot allocate memory");
635 *out_len = 0;
636 return -ENOMEM;
637 }
638
639 for (i = o = 0; i < in_len; i += unilen, o += utflen) {
640
641 /* convert from nls to unicode */
642 unilen = nls->char2uni(&in[i], in_len - i, &uni);
Alan Stern74675a52009-04-30 10:08:18 -0400643 if (unilen < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
646 /* convert from unicode to UTF-8 */
Alan Stern74675a52009-04-30 10:08:18 -0400647 utflen = utf32_to_utf8(uni, &result[o], 3);
648 if (utflen <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 goto conv_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 }
651
652 result[o] = '\0';
653 *out_len = o;
654
655 befs_debug(sb, "<--- nls2utf()");
656
657 return i;
658
659 conv_err:
660 befs_error(sb, "Name using charecter set %s contains a charecter that "
661 "cannot be converted to unicode.", nls->charset);
662 befs_debug(sb, "<--- nls2utf()");
663 kfree(result);
664 return -EILSEQ;
665}
666
667/**
668 * Use the
669 *
670 */
671enum {
672 Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
673};
674
Steven Whitehousea447c092008-10-13 10:46:57 +0100675static const match_table_t befs_tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 {Opt_uid, "uid=%d"},
677 {Opt_gid, "gid=%d"},
678 {Opt_charset, "iocharset=%s"},
679 {Opt_debug, "debug"},
680 {Opt_err, NULL}
681};
682
683static int
684parse_options(char *options, befs_mount_options * opts)
685{
686 char *p;
687 substring_t args[MAX_OPT_ARGS];
688 int option;
Eric W. Biederman31aba052012-02-10 10:51:24 -0800689 kuid_t uid;
690 kgid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
692 /* Initialize options */
Eric W. Biederman31aba052012-02-10 10:51:24 -0800693 opts->uid = GLOBAL_ROOT_UID;
694 opts->gid = GLOBAL_ROOT_GID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 opts->use_uid = 0;
696 opts->use_gid = 0;
697 opts->iocharset = NULL;
698 opts->debug = 0;
699
700 if (!options)
701 return 1;
702
703 while ((p = strsep(&options, ",")) != NULL) {
704 int token;
705 if (!*p)
706 continue;
707
708 token = match_token(p, befs_tokens, args);
709 switch (token) {
710 case Opt_uid:
711 if (match_int(&args[0], &option))
712 return 0;
Eric W. Biederman31aba052012-02-10 10:51:24 -0800713 uid = INVALID_UID;
714 if (option >= 0)
715 uid = make_kuid(current_user_ns(), option);
716 if (!uid_valid(uid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 printk(KERN_ERR "BeFS: Invalid uid %d, "
718 "using default\n", option);
719 break;
720 }
Eric W. Biederman31aba052012-02-10 10:51:24 -0800721 opts->uid = uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 opts->use_uid = 1;
723 break;
724 case Opt_gid:
725 if (match_int(&args[0], &option))
726 return 0;
Eric W. Biederman31aba052012-02-10 10:51:24 -0800727 gid = INVALID_GID;
728 if (option >= 0)
729 gid = make_kgid(current_user_ns(), option);
730 if (!gid_valid(gid)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 printk(KERN_ERR "BeFS: Invalid gid %d, "
732 "using default\n", option);
733 break;
734 }
Eric W. Biederman31aba052012-02-10 10:51:24 -0800735 opts->gid = gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 opts->use_gid = 1;
737 break;
738 case Opt_charset:
739 kfree(opts->iocharset);
740 opts->iocharset = match_strdup(&args[0]);
741 if (!opts->iocharset) {
742 printk(KERN_ERR "BeFS: allocation failure for "
743 "iocharset string\n");
744 return 0;
745 }
746 break;
747 case Opt_debug:
748 opts->debug = 1;
749 break;
750 default:
751 printk(KERN_ERR "BeFS: Unrecognized mount option \"%s\" "
752 "or missing value\n", p);
753 return 0;
754 }
755 }
756 return 1;
757}
758
759/* This function has the responsibiltiy of getting the
760 * filesystem ready for unmounting.
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300761 * Basically, we free everything that we allocated in
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 * befs_read_inode
763 */
764static void
765befs_put_super(struct super_block *sb)
766{
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800767 kfree(BEFS_SB(sb)->mount_opts.iocharset);
768 BEFS_SB(sb)->mount_opts.iocharset = NULL;
Thomas Gleixner6d729e42009-08-16 21:05:08 +0000769 unload_nls(BEFS_SB(sb)->nls);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800770 kfree(sb->s_fs_info);
771 sb->s_fs_info = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772}
773
774/* Allocate private field of the superblock, fill it.
775 *
776 * Finish filling the public superblock fields
777 * Make the root directory
778 * Load a set of NLS translations if needed.
779 */
780static int
781befs_fill_super(struct super_block *sb, void *data, int silent)
782{
783 struct buffer_head *bh;
784 befs_sb_info *befs_sb;
785 befs_super_block *disk_sb;
786 struct inode *root;
David Howells96eb5412008-02-07 00:15:31 -0800787 long ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 const unsigned long sb_block = 0;
789 const off_t x86_sb_off = 512;
790
Miklos Szeredi552c3c62008-02-08 04:21:38 -0800791 save_mount_options(sb, data);
792
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 sb->s_fs_info = kmalloc(sizeof (*befs_sb), GFP_KERNEL);
794 if (sb->s_fs_info == NULL) {
795 printk(KERN_ERR
796 "BeFS(%s): Unable to allocate memory for private "
797 "portion of superblock. Bailing.\n", sb->s_id);
Adrian Bunk04187262006-06-30 18:23:04 +0200798 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 }
800 befs_sb = BEFS_SB(sb);
801 memset(befs_sb, 0, sizeof(befs_sb_info));
802
803 if (!parse_options((char *) data, &befs_sb->mount_opts)) {
804 befs_error(sb, "cannot parse mount options");
Adrian Bunk04187262006-06-30 18:23:04 +0200805 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 }
807
808 befs_debug(sb, "---> befs_fill_super()");
809
810#ifndef CONFIG_BEFS_RW
811 if (!(sb->s_flags & MS_RDONLY)) {
812 befs_warning(sb,
813 "No write support. Marking filesystem read-only");
814 sb->s_flags |= MS_RDONLY;
815 }
816#endif /* CONFIG_BEFS_RW */
817
818 /*
819 * Set dummy blocksize to read super block.
820 * Will be set to real fs blocksize later.
821 *
822 * Linux 2.4.10 and later refuse to read blocks smaller than
823 * the hardsect size for the device. But we also need to read at
824 * least 1k to get the second 512 bytes of the volume.
825 * -WD 10-26-01
826 */
827 sb_min_blocksize(sb, 1024);
828
829 if (!(bh = sb_bread(sb, sb_block))) {
830 befs_error(sb, "unable to read superblock");
Adrian Bunk04187262006-06-30 18:23:04 +0200831 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 }
833
834 /* account for offset of super block on x86 */
835 disk_sb = (befs_super_block *) bh->b_data;
Harvey Harrison152b95a2008-10-15 22:04:03 -0700836 if ((disk_sb->magic1 == BEFS_SUPER_MAGIC1_LE) ||
837 (disk_sb->magic1 == BEFS_SUPER_MAGIC1_BE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 befs_debug(sb, "Using PPC superblock location");
839 } else {
840 befs_debug(sb, "Using x86 superblock location");
841 disk_sb =
842 (befs_super_block *) ((void *) bh->b_data + x86_sb_off);
843 }
844
845 if (befs_load_sb(sb, disk_sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200846 goto unacquire_bh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
848 befs_dump_super_block(sb, disk_sb);
849
850 brelse(bh);
851
852 if (befs_check_sb(sb) != BEFS_OK)
Adrian Bunk04187262006-06-30 18:23:04 +0200853 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
855 if( befs_sb->num_blocks > ~((sector_t)0) ) {
856 befs_error(sb, "blocks count: %Lu "
857 "is larger than the host can use",
858 befs_sb->num_blocks);
Adrian Bunk04187262006-06-30 18:23:04 +0200859 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 }
861
862 /*
863 * set up enough so that it can read an inode
864 * Fill in kernel superblock fields from private sb
865 */
866 sb->s_magic = BEFS_SUPER_MAGIC;
867 /* Set real blocksize of fs */
868 sb_set_blocksize(sb, (ulong) befs_sb->block_size);
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700869 sb->s_op = &befs_sops;
David Howells96eb5412008-02-07 00:15:31 -0800870 root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
871 if (IS_ERR(root)) {
872 ret = PTR_ERR(root);
873 goto unacquire_priv_sbp;
874 }
Al Viro48fde702012-01-08 22:15:13 -0500875 sb->s_root = d_make_root(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 if (!sb->s_root) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 befs_error(sb, "get root inode failed");
Adrian Bunk04187262006-06-30 18:23:04 +0200878 goto unacquire_priv_sbp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 }
880
881 /* load nls library */
882 if (befs_sb->mount_opts.iocharset) {
883 befs_debug(sb, "Loading nls: %s",
884 befs_sb->mount_opts.iocharset);
885 befs_sb->nls = load_nls(befs_sb->mount_opts.iocharset);
886 if (!befs_sb->nls) {
887 befs_warning(sb, "Cannot load nls %s"
888 " loading default nls",
889 befs_sb->mount_opts.iocharset);
890 befs_sb->nls = load_nls_default();
891 }
892 /* load default nls if none is specified in mount options */
893 } else {
894 befs_debug(sb, "Loading default nls");
895 befs_sb->nls = load_nls_default();
896 }
897
898 return 0;
899/*****************/
Adrian Bunk04187262006-06-30 18:23:04 +0200900 unacquire_bh:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 brelse(bh);
902
Adrian Bunk04187262006-06-30 18:23:04 +0200903 unacquire_priv_sbp:
Al Viro8dd5ca52010-01-28 22:11:38 -0500904 kfree(befs_sb->mount_opts.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 kfree(sb->s_fs_info);
906
Adrian Bunk04187262006-06-30 18:23:04 +0200907 unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 sb->s_fs_info = NULL;
David Howells96eb5412008-02-07 00:15:31 -0800909 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910}
911
912static int
913befs_remount(struct super_block *sb, int *flags, char *data)
914{
915 if (!(*flags & MS_RDONLY))
916 return -EINVAL;
917 return 0;
918}
919
920static int
David Howells726c3342006-06-23 02:02:58 -0700921befs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922{
David Howells726c3342006-06-23 02:02:58 -0700923 struct super_block *sb = dentry->d_sb;
Coly Li85872462009-04-02 16:59:32 -0700924 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
926 befs_debug(sb, "---> befs_statfs()");
927
928 buf->f_type = BEFS_SUPER_MAGIC;
929 buf->f_bsize = sb->s_blocksize;
930 buf->f_blocks = BEFS_SB(sb)->num_blocks;
931 buf->f_bfree = BEFS_SB(sb)->num_blocks - BEFS_SB(sb)->used_blocks;
932 buf->f_bavail = buf->f_bfree;
933 buf->f_files = 0; /* UNKNOWN */
934 buf->f_ffree = 0; /* UNKNOWN */
Coly Li85872462009-04-02 16:59:32 -0700935 buf->f_fsid.val[0] = (u32)id;
936 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 buf->f_namelen = BEFS_NAME_LEN;
938
939 befs_debug(sb, "<--- befs_statfs()");
940
941 return 0;
942}
943
Al Viro152a0832010-07-25 00:46:55 +0400944static struct dentry *
945befs_mount(struct file_system_type *fs_type, int flags, const char *dev_name,
946 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947{
Al Viro152a0832010-07-25 00:46:55 +0400948 return mount_bdev(fs_type, flags, dev_name, data, befs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949}
950
951static struct file_system_type befs_fs_type = {
952 .owner = THIS_MODULE,
953 .name = "befs",
Al Viro152a0832010-07-25 00:46:55 +0400954 .mount = befs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 .kill_sb = kill_block_super,
956 .fs_flags = FS_REQUIRES_DEV,
957};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800958MODULE_ALIAS_FS("befs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
960static int __init
961init_befs_fs(void)
962{
963 int err;
964
965 printk(KERN_INFO "BeFS version: %s\n", BEFS_VERSION);
966
967 err = befs_init_inodecache();
968 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200969 goto unacquire_none;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
971 err = register_filesystem(&befs_fs_type);
972 if (err)
Adrian Bunk04187262006-06-30 18:23:04 +0200973 goto unacquire_inodecache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
975 return 0;
976
Adrian Bunk04187262006-06-30 18:23:04 +0200977unacquire_inodecache:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 befs_destroy_inodecache();
979
Adrian Bunk04187262006-06-30 18:23:04 +0200980unacquire_none:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 return err;
982}
983
984static void __exit
985exit_befs_fs(void)
986{
987 befs_destroy_inodecache();
988
989 unregister_filesystem(&befs_fs_type);
990}
991
992/*
993Macros that typecheck the init and exit functions,
994ensures that they are called at init and cleanup,
995and eliminates warnings about unused functions.
996*/
997module_init(init_befs_fs)
998module_exit(exit_befs_fs)