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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/smp_lock.h>
16#include <linux/vfs.h>
17#include <linux/nls.h>
18
19static struct inode *hfsplus_alloc_inode(struct super_block *sb);
20static void hfsplus_destroy_inode(struct inode *inode);
21
22#include "hfsplus_fs.h"
23
24struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
25{
26 struct hfs_find_data fd;
27 struct hfsplus_vh *vhdr;
28 struct inode *inode;
29 long err = -EIO;
30
31 inode = iget_locked(sb, ino);
32 if (!inode)
33 return ERR_PTR(-ENOMEM);
34 if (!(inode->i_state & I_NEW))
35 return inode;
36
37 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
38 mutex_init(&HFSPLUS_I(inode).extents_lock);
39 HFSPLUS_I(inode).flags = 0;
40 HFSPLUS_I(inode).rsrc_inode = NULL;
41 atomic_set(&HFSPLUS_I(inode).opencnt, 0);
42
43 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
44 read_inode:
45 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
46 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
47 if (!err)
48 err = hfsplus_cat_read_inode(inode, &fd);
49 hfs_find_exit(&fd);
50 if (err)
51 goto bad_inode;
52 goto done;
53 }
54 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
55 switch(inode->i_ino) {
56 case HFSPLUS_ROOT_CNID:
57 goto read_inode;
58 case HFSPLUS_EXT_CNID:
59 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
60 inode->i_mapping->a_ops = &hfsplus_btree_aops;
61 break;
62 case HFSPLUS_CAT_CNID:
63 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
64 inode->i_mapping->a_ops = &hfsplus_btree_aops;
65 break;
66 case HFSPLUS_ALLOC_CNID:
67 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
68 inode->i_mapping->a_ops = &hfsplus_aops;
69 break;
70 case HFSPLUS_START_CNID:
71 hfsplus_inode_read_fork(inode, &vhdr->start_file);
72 break;
73 case HFSPLUS_ATTR_CNID:
74 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
75 inode->i_mapping->a_ops = &hfsplus_btree_aops;
76 break;
77 default:
78 goto bad_inode;
79 }
80
81done:
82 unlock_new_inode(inode);
83 return inode;
84
85bad_inode:
86 iget_failed(inode);
87 return ERR_PTR(err);
88}
89
90static int hfsplus_write_inode(struct inode *inode, int unused)
91{
92 struct hfsplus_vh *vhdr;
93 int ret = 0;
94
95 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
96 hfsplus_ext_write_extent(inode);
97 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
98 return hfsplus_cat_write_inode(inode);
99 }
100 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
101 switch (inode->i_ino) {
102 case HFSPLUS_ROOT_CNID:
103 ret = hfsplus_cat_write_inode(inode);
104 break;
105 case HFSPLUS_EXT_CNID:
106 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
107 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
108 inode->i_sb->s_dirt = 1;
109 }
110 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
111 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
112 break;
113 case HFSPLUS_CAT_CNID:
114 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
115 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
116 inode->i_sb->s_dirt = 1;
117 }
118 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
119 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
120 break;
121 case HFSPLUS_ALLOC_CNID:
122 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
123 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
124 inode->i_sb->s_dirt = 1;
125 }
126 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
127 break;
128 case HFSPLUS_START_CNID:
129 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
130 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
131 inode->i_sb->s_dirt = 1;
132 }
133 hfsplus_inode_write_fork(inode, &vhdr->start_file);
134 break;
135 case HFSPLUS_ATTR_CNID:
136 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
137 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
138 inode->i_sb->s_dirt = 1;
139 }
140 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
141 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
142 break;
143 }
144 return ret;
145}
146
147static void hfsplus_clear_inode(struct inode *inode)
148{
149 dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
150 if (HFSPLUS_IS_RSRC(inode)) {
151 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
152 iput(HFSPLUS_I(inode).rsrc_inode);
153 }
154}
155
156static int hfsplus_sync_fs(struct super_block *sb, int wait)
157{
158 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
159
160 dprint(DBG_SUPER, "hfsplus_write_super\n");
161
162 lock_super(sb);
163 sb->s_dirt = 0;
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 unlock_super(sb);
196 return 0;
197}
198
199static void hfsplus_write_super(struct super_block *sb)
200{
201 if (!(sb->s_flags & MS_RDONLY))
202 hfsplus_sync_fs(sb, 1);
203 else
204 sb->s_dirt = 0;
205}
206
207static void hfsplus_put_super(struct super_block *sb)
208{
209 dprint(DBG_SUPER, "hfsplus_put_super\n");
210 if (!sb->s_fs_info)
211 return;
212
213 lock_kernel();
214
215 if (sb->s_dirt)
216 hfsplus_write_super(sb);
217 if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
218 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
219
220 vhdr->modify_date = hfsp_now2mt();
221 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
222 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
223 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
224 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
225 }
226
227 hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
228 hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
229 iput(HFSPLUS_SB(sb).alloc_file);
230 iput(HFSPLUS_SB(sb).hidden_dir);
231 brelse(HFSPLUS_SB(sb).s_vhbh);
232 unload_nls(HFSPLUS_SB(sb).nls);
233 kfree(sb->s_fs_info);
234 sb->s_fs_info = NULL;
235
236 unlock_kernel();
237}
238
239static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
240{
241 struct super_block *sb = dentry->d_sb;
242 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
243
244 buf->f_type = HFSPLUS_SUPER_MAGIC;
245 buf->f_bsize = sb->s_blocksize;
246 buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
247 buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
248 buf->f_bavail = buf->f_bfree;
249 buf->f_files = 0xFFFFFFFF;
250 buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
251 buf->f_fsid.val[0] = (u32)id;
252 buf->f_fsid.val[1] = (u32)(id >> 32);
253 buf->f_namelen = HFSPLUS_MAX_STRLEN;
254
255 return 0;
256}
257
258static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
259{
260 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
261 return 0;
262 if (!(*flags & MS_RDONLY)) {
263 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
264 struct hfsplus_sb_info sbi;
265
266 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
267 sbi.nls = HFSPLUS_SB(sb).nls;
268 if (!hfsplus_parse_options(data, &sbi))
269 return -EINVAL;
270
271 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
272 printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
273 "running fsck.hfsplus is recommended. leaving read-only.\n");
274 sb->s_flags |= MS_RDONLY;
275 *flags |= MS_RDONLY;
276 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
277
278 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
279 printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
280 sb->s_flags |= MS_RDONLY;
281 *flags |= MS_RDONLY;
282 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
283 printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
284 sb->s_flags |= MS_RDONLY;
285 *flags |= MS_RDONLY;
286 }
287 }
288 return 0;
289}
290
291static const struct super_operations hfsplus_sops = {
292 .alloc_inode = hfsplus_alloc_inode,
293 .destroy_inode = hfsplus_destroy_inode,
294 .write_inode = hfsplus_write_inode,
295 .clear_inode = hfsplus_clear_inode,
296 .put_super = hfsplus_put_super,
297 .write_super = hfsplus_write_super,
298 .sync_fs = hfsplus_sync_fs,
299 .statfs = hfsplus_statfs,
300 .remount_fs = hfsplus_remount,
301 .show_options = hfsplus_show_options,
302};
303
304static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
305{
306 struct hfsplus_vh *vhdr;
307 struct hfsplus_sb_info *sbi;
308 hfsplus_cat_entry entry;
309 struct hfs_find_data fd;
310 struct inode *root, *inode;
311 struct qstr str;
312 struct nls_table *nls = NULL;
313 int err = -EINVAL;
314
315 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
316 if (!sbi)
317 return -ENOMEM;
318
319 sb->s_fs_info = sbi;
320 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
321 hfsplus_fill_defaults(sbi);
322 if (!hfsplus_parse_options(data, sbi)) {
323 printk(KERN_ERR "hfs: unable to parse mount options\n");
324 err = -EINVAL;
325 goto cleanup;
326 }
327
328
329 nls = sbi->nls;
330 sbi->nls = load_nls("utf8");
331 if (!sbi->nls) {
332 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
333 err = -EINVAL;
334 goto cleanup;
335 }
336
337
338 if (hfsplus_read_wrapper(sb)) {
339 if (!silent)
340 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
341 err = -EINVAL;
342 goto cleanup;
343 }
344 vhdr = HFSPLUS_SB(sb).s_vhdr;
345
346
347 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
348 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
349 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
350 printk(KERN_ERR "hfs: wrong filesystem version\n");
351 goto cleanup;
352 }
353 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
354 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
355 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
356 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
357 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
358 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
359 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
360 if (!HFSPLUS_SB(sb).data_clump_blocks)
361 HFSPLUS_SB(sb).data_clump_blocks = 1;
362 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
363 if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
364 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
365
366
367 sb->s_op = &hfsplus_sops;
368 sb->s_maxbytes = MAX_LFS_FILESIZE;
369
370 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
371 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
372 "running fsck.hfsplus is recommended. mounting read-only.\n");
373 sb->s_flags |= MS_RDONLY;
374 } else if (sbi->flags & HFSPLUS_SB_FORCE) {
375
376 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
377 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
378 sb->s_flags |= MS_RDONLY;
379 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
380 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
381 "use the force option at your own risk, mounting read-only.\n");
382 sb->s_flags |= MS_RDONLY;
383 }
384 sbi->flags &= ~HFSPLUS_SB_FORCE;
385
386
387 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
388 if (!HFSPLUS_SB(sb).ext_tree) {
389 printk(KERN_ERR "hfs: failed to load extents file\n");
390 goto cleanup;
391 }
392 HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
393 if (!HFSPLUS_SB(sb).cat_tree) {
394 printk(KERN_ERR "hfs: failed to load catalog file\n");
395 goto cleanup;
396 }
397
398 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
399 if (IS_ERR(inode)) {
400 printk(KERN_ERR "hfs: failed to load allocation file\n");
401 err = PTR_ERR(inode);
402 goto cleanup;
403 }
404 HFSPLUS_SB(sb).alloc_file = inode;
405
406
407 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
408 if (IS_ERR(root)) {
409 printk(KERN_ERR "hfs: failed to load root directory\n");
410 err = PTR_ERR(root);
411 goto cleanup;
412 }
413 sb->s_root = d_alloc_root(root);
414 if (!sb->s_root) {
415 iput(root);
416 err = -ENOMEM;
417 goto cleanup;
418 }
419 sb->s_root->d_op = &hfsplus_dentry_operations;
420
421 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
422 str.name = HFSP_HIDDENDIR_NAME;
423 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
424 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
425 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
426 hfs_find_exit(&fd);
427 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
428 goto cleanup;
429 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
430 if (IS_ERR(inode)) {
431 err = PTR_ERR(inode);
432 goto cleanup;
433 }
434 HFSPLUS_SB(sb).hidden_dir = inode;
435 } else
436 hfs_find_exit(&fd);
437
438 if (sb->s_flags & MS_RDONLY)
439 goto out;
440
441
442
443
444 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
445 vhdr->modify_date = hfsp_now2mt();
446 be32_add_cpu(&vhdr->write_count, 1);
447 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
448 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
449 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
450 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
451
452 if (!HFSPLUS_SB(sb).hidden_dir) {
453 printk(KERN_DEBUG "hfs: create hidden dir...\n");
454 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
455 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
456 &str, HFSPLUS_SB(sb).hidden_dir);
457 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
458 }
459out:
460 unload_nls(sbi->nls);
461 sbi->nls = nls;
462 return 0;
463
464cleanup:
465 hfsplus_put_super(sb);
466 unload_nls(nls);
467 return err;
468}
469
470MODULE_AUTHOR("Brad Boyer");
471MODULE_DESCRIPTION("Extended Macintosh Filesystem");
472MODULE_LICENSE("GPL");
473
474static struct kmem_cache *hfsplus_inode_cachep;
475
476static struct inode *hfsplus_alloc_inode(struct super_block *sb)
477{
478 struct hfsplus_inode_info *i;
479
480 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
481 return i ? &i->vfs_inode : NULL;
482}
483
484static void hfsplus_destroy_inode(struct inode *inode)
485{
486 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
487}
488
489#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
490
491static int hfsplus_get_sb(struct file_system_type *fs_type,
492 int flags, const char *dev_name, void *data,
493 struct vfsmount *mnt)
494{
495 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
496 mnt);
497}
498
499static struct file_system_type hfsplus_fs_type = {
500 .owner = THIS_MODULE,
501 .name = "hfsplus",
502 .get_sb = hfsplus_get_sb,
503 .kill_sb = kill_block_super,
504 .fs_flags = FS_REQUIRES_DEV,
505};
506
507static void hfsplus_init_once(void *p)
508{
509 struct hfsplus_inode_info *i = p;
510
511 inode_init_once(&i->vfs_inode);
512}
513
514static int __init init_hfsplus_fs(void)
515{
516 int err;
517
518 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
519 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
520 hfsplus_init_once);
521 if (!hfsplus_inode_cachep)
522 return -ENOMEM;
523 err = register_filesystem(&hfsplus_fs_type);
524 if (err)
525 kmem_cache_destroy(hfsplus_inode_cachep);
526 return err;
527}
528
529static void __exit exit_hfsplus_fs(void)
530{
531 unregister_filesystem(&hfsplus_fs_type);
532 kmem_cache_destroy(hfsplus_inode_cachep);
533}
534
535module_init(init_hfsplus_fs)
536module_exit(exit_hfsplus_fs)
537
