1 /*
2 * linux/fs/hfsplus/super.c
3 *
4 * Copyright (C) 2001
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
7 *
8 */
9
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/pagemap.h>
13 #include <linux/fs.h>
14 #include <linux/slab.h>
15 #include <linux/vfs.h>
16 #include <linux/nls.h>
17
18 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
19 static void hfsplus_destroy_inode(struct inode *inode);
20
21 #include "hfsplus_fs.h"
22
23 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
24 {
25 struct hfs_find_data fd;
26 struct hfsplus_vh *vhdr;
27 struct inode *inode;
28 long err = -EIO;
29
30 inode = iget_locked(sb, ino);
31 if (!inode)
32 return ERR_PTR(-ENOMEM);
33 if (!(inode->i_state & I_NEW))
34 return inode;
35
36 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
37 init_MUTEX(&HFSPLUS_I(inode).extents_lock);
38 HFSPLUS_I(inode).flags = 0;
39 HFSPLUS_I(inode).rsrc_inode = NULL;
40 atomic_set(&HFSPLUS_I(inode).opencnt, 0);
41
42 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
43 read_inode:
44 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
45 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
46 if (!err)
47 err = hfsplus_cat_read_inode(inode, &fd);
48 hfs_find_exit(&fd);
49 if (err)
50 goto bad_inode;
51 goto done;
52 }
53 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
54 switch(inode->i_ino) {
55 case HFSPLUS_ROOT_CNID:
56 goto read_inode;
57 case HFSPLUS_EXT_CNID:
58 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
59 inode->i_mapping->a_ops = &hfsplus_btree_aops;
60 break;
61 case HFSPLUS_CAT_CNID:
62 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
63 inode->i_mapping->a_ops = &hfsplus_btree_aops;
64 break;
65 case HFSPLUS_ALLOC_CNID:
66 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
67 inode->i_mapping->a_ops = &hfsplus_aops;
68 break;
69 case HFSPLUS_START_CNID:
70 hfsplus_inode_read_fork(inode, &vhdr->start_file);
71 break;
72 case HFSPLUS_ATTR_CNID:
73 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
74 inode->i_mapping->a_ops = &hfsplus_btree_aops;
75 break;
76 default:
77 goto bad_inode;
78 }
79
80 done:
81 unlock_new_inode(inode);
82 return inode;
83
84 bad_inode:
85 iget_failed(inode);
86 return ERR_PTR(err);
87 }
88
89 static int hfsplus_write_inode(struct inode *inode, int unused)
90 {
91 struct hfsplus_vh *vhdr;
92 int ret = 0;
93
94 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
95 hfsplus_ext_write_extent(inode);
96 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
97 return hfsplus_cat_write_inode(inode);
98 }
99 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
100 switch (inode->i_ino) {
101 case HFSPLUS_ROOT_CNID:
102 ret = hfsplus_cat_write_inode(inode);
103 break;
104 case HFSPLUS_EXT_CNID:
105 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
106 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
107 inode->i_sb->s_dirt = 1;
108 }
109 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
110 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
111 break;
112 case HFSPLUS_CAT_CNID:
113 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
114 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
115 inode->i_sb->s_dirt = 1;
116 }
117 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
118 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
119 break;
120 case HFSPLUS_ALLOC_CNID:
121 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
122 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
123 inode->i_sb->s_dirt = 1;
124 }
125 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
126 break;
127 case HFSPLUS_START_CNID:
128 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
129 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
130 inode->i_sb->s_dirt = 1;
131 }
132 hfsplus_inode_write_fork(inode, &vhdr->start_file);
133 break;
134 case HFSPLUS_ATTR_CNID:
135 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
136 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
137 inode->i_sb->s_dirt = 1;
138 }
139 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
140 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
141 break;
142 }
143 return ret;
144 }
145
146 static void hfsplus_clear_inode(struct inode *inode)
147 {
148 dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
149 if (HFSPLUS_IS_RSRC(inode)) {
150 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
151 iput(HFSPLUS_I(inode).rsrc_inode);
152 }
153 }
154
155 static void hfsplus_write_super(struct super_block *sb)
156 {
157 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
158
159 dprint(DBG_SUPER, "hfsplus_write_super\n");
160 sb->s_dirt = 0;
161 if (sb->s_flags & MS_RDONLY)
162 /* warn? */
163 return;
164
165 vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
166 vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
167 vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
168 vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
169 vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
170
171 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
172 if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
173 if (HFSPLUS_SB(sb).sect_count) {
174 struct buffer_head *bh;
175 u32 block, offset;
176
177 block = HFSPLUS_SB(sb).blockoffset;
178 block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
179 offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
180 printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
181 HFSPLUS_SB(sb).sect_count, block, offset);
182 bh = sb_bread(sb, block);
183 if (bh) {
184 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
185 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
186 memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
187 mark_buffer_dirty(bh);
188 brelse(bh);
189 } else
190 printk(KERN_WARNING "hfs: backup not found!\n");
191 }
192 }
193 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
194 }
195 }
196
197 static void hfsplus_put_super(struct super_block *sb)
198 {
199 dprint(DBG_SUPER, "hfsplus_put_super\n");
200 if (!sb->s_fs_info)
201 return;
202 if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
203 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
204
205 vhdr->modify_date = hfsp_now2mt();
206 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
207 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
208 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
209 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
210 }
211
212 hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
213 hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
214 iput(HFSPLUS_SB(sb).alloc_file);
215 iput(HFSPLUS_SB(sb).hidden_dir);
216 brelse(HFSPLUS_SB(sb).s_vhbh);
217 if (HFSPLUS_SB(sb).nls)
218 unload_nls(HFSPLUS_SB(sb).nls);
219 kfree(sb->s_fs_info);
220 sb->s_fs_info = NULL;
221 }
222
223 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
224 {
225 struct super_block *sb = dentry->d_sb;
226
227 buf->f_type = HFSPLUS_SUPER_MAGIC;
228 buf->f_bsize = sb->s_blocksize;
229 buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
230 buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
231 buf->f_bavail = buf->f_bfree;
232 buf->f_files = 0xFFFFFFFF;
233 buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
234 buf->f_namelen = HFSPLUS_MAX_STRLEN;
235
236 return 0;
237 }
238
239 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
240 {
241 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
242 return 0;
243 if (!(*flags & MS_RDONLY)) {
244 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
245 struct hfsplus_sb_info sbi;
246
247 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
248 sbi.nls = HFSPLUS_SB(sb).nls;
249 if (!hfsplus_parse_options(data, &sbi))
250 return -EINVAL;
251
252 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
253 printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
254 "running fsck.hfsplus is recommended. leaving read-only.\n");
255 sb->s_flags |= MS_RDONLY;
256 *flags |= MS_RDONLY;
257 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
258 /* nothing */
259 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
260 printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
261 sb->s_flags |= MS_RDONLY;
262 *flags |= MS_RDONLY;
263 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
264 printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
265 sb->s_flags |= MS_RDONLY;
266 *flags |= MS_RDONLY;
267 }
268 }
269 return 0;
270 }
271
272 static const struct super_operations hfsplus_sops = {
273 .alloc_inode = hfsplus_alloc_inode,
274 .destroy_inode = hfsplus_destroy_inode,
275 .write_inode = hfsplus_write_inode,
276 .clear_inode = hfsplus_clear_inode,
277 .put_super = hfsplus_put_super,
278 .write_super = hfsplus_write_super,
279 .statfs = hfsplus_statfs,
280 .remount_fs = hfsplus_remount,
281 .show_options = hfsplus_show_options,
282 };
283
284 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
285 {
286 struct hfsplus_vh *vhdr;
287 struct hfsplus_sb_info *sbi;
288 hfsplus_cat_entry entry;
289 struct hfs_find_data fd;
290 struct inode *root, *inode;
291 struct qstr str;
292 struct nls_table *nls = NULL;
293 int err = -EINVAL;
294
295 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
296 if (!sbi)
297 return -ENOMEM;
298
299 sb->s_fs_info = sbi;
300 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
301 hfsplus_fill_defaults(sbi);
302 if (!hfsplus_parse_options(data, sbi)) {
303 printk(KERN_ERR "hfs: unable to parse mount options\n");
304 err = -EINVAL;
305 goto cleanup;
306 }
307
308 /* temporarily use utf8 to correctly find the hidden dir below */
309 nls = sbi->nls;
310 sbi->nls = load_nls("utf8");
311 if (!sbi->nls) {
312 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
313 err = -EINVAL;
314 goto cleanup;
315 }
316
317 /* Grab the volume header */
318 if (hfsplus_read_wrapper(sb)) {
319 if (!silent)
320 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
321 err = -EINVAL;
322 goto cleanup;
323 }
324 vhdr = HFSPLUS_SB(sb).s_vhdr;
325
326 /* Copy parts of the volume header into the superblock */
327 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
328 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
329 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
330 printk(KERN_ERR "hfs: wrong filesystem version\n");
331 goto cleanup;
332 }
333 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
334 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
335 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
336 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
337 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
338 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
339 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
340 if (!HFSPLUS_SB(sb).data_clump_blocks)
341 HFSPLUS_SB(sb).data_clump_blocks = 1;
342 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
343 if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
344 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
345
346 /* Set up operations so we can load metadata */
347 sb->s_op = &hfsplus_sops;
348 sb->s_maxbytes = MAX_LFS_FILESIZE;
349
350 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
351 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
352 "running fsck.hfsplus is recommended. mounting read-only.\n");
353 sb->s_flags |= MS_RDONLY;
354 } else if (sbi->flags & HFSPLUS_SB_FORCE) {
355 /* nothing */
356 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
357 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
358 sb->s_flags |= MS_RDONLY;
359 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
360 printk(KERN_WARNING "hfs: write access to a jounaled filesystem is not supported, "
361 "use the force option at your own risk, mounting read-only.\n");
362 sb->s_flags |= MS_RDONLY;
363 }
364 sbi->flags &= ~HFSPLUS_SB_FORCE;
365
366 /* Load metadata objects (B*Trees) */
367 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
368 if (!HFSPLUS_SB(sb).ext_tree) {
369 printk(KERN_ERR "hfs: failed to load extents file\n");
370 goto cleanup;
371 }
372 HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
373 if (!HFSPLUS_SB(sb).cat_tree) {
374 printk(KERN_ERR "hfs: failed to load catalog file\n");
375 goto cleanup;
376 }
377
378 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
379 if (IS_ERR(inode)) {
380 printk(KERN_ERR "hfs: failed to load allocation file\n");
381 err = PTR_ERR(inode);
382 goto cleanup;
383 }
384 HFSPLUS_SB(sb).alloc_file = inode;
385
386 /* Load the root directory */
387 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
388 if (IS_ERR(root)) {
389 printk(KERN_ERR "hfs: failed to load root directory\n");
390 err = PTR_ERR(root);
391 goto cleanup;
392 }
393 sb->s_root = d_alloc_root(root);
394 if (!sb->s_root) {
395 iput(root);
396 err = -ENOMEM;
397 goto cleanup;
398 }
399 sb->s_root->d_op = &hfsplus_dentry_operations;
400
401 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
402 str.name = HFSP_HIDDENDIR_NAME;
403 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
404 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
405 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
406 hfs_find_exit(&fd);
407 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
408 goto cleanup;
409 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
410 if (IS_ERR(inode)) {
411 err = PTR_ERR(inode);
412 goto cleanup;
413 }
414 HFSPLUS_SB(sb).hidden_dir = inode;
415 } else
416 hfs_find_exit(&fd);
417
418 if (sb->s_flags & MS_RDONLY)
419 goto out;
420
421 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
422 * all three are registered with Apple for our use
423 */
424 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
425 vhdr->modify_date = hfsp_now2mt();
426 vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
427 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
428 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
429 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
430 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
431
432 if (!HFSPLUS_SB(sb).hidden_dir) {
433 printk(KERN_DEBUG "hfs: create hidden dir...\n");
434 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
435 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
436 &str, HFSPLUS_SB(sb).hidden_dir);
437 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
438 }
439 out:
440 unload_nls(sbi->nls);
441 sbi->nls = nls;
442 return 0;
443
444 cleanup:
445 hfsplus_put_super(sb);
446 if (nls)
447 unload_nls(nls);
448 return err;
449 }
450
451 MODULE_AUTHOR("Brad Boyer");
452 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
453 MODULE_LICENSE("GPL");
454
455 static struct kmem_cache *hfsplus_inode_cachep;
456
457 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
458 {
459 struct hfsplus_inode_info *i;
460
461 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
462 return i ? &i->vfs_inode : NULL;
463 }
464
465 static void hfsplus_destroy_inode(struct inode *inode)
466 {
467 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
468 }
469
470 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
471
472 static int hfsplus_get_sb(struct file_system_type *fs_type,
473 int flags, const char *dev_name, void *data,
474 struct vfsmount *mnt)
475 {
476 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
477 mnt);
478 }
479
480 static struct file_system_type hfsplus_fs_type = {
481 .owner = THIS_MODULE,
482 .name = "hfsplus",
483 .get_sb = hfsplus_get_sb,
484 .kill_sb = kill_block_super,
485 .fs_flags = FS_REQUIRES_DEV,
486 };
487
488 static void hfsplus_init_once(struct kmem_cache *cachep, void *p)
489 {
490 struct hfsplus_inode_info *i = p;
491
492 inode_init_once(&i->vfs_inode);
493 }
494
495 static int __init init_hfsplus_fs(void)
496 {
497 int err;
498
499 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
500 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
501 hfsplus_init_once);
502 if (!hfsplus_inode_cachep)
503 return -ENOMEM;
504 err = register_filesystem(&hfsplus_fs_type);
505 if (err)
506 kmem_cache_destroy(hfsplus_inode_cachep);
507 return err;
508 }
509
510 static void __exit exit_hfsplus_fs(void)
511 {
512 unregister_filesystem(&hfsplus_fs_type);
513 kmem_cache_destroy(hfsplus_inode_cachep);
514 }
515
516 module_init(init_hfsplus_fs)
517 module_exit(exit_hfsplus_fs)
518
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