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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 if (HFSPLUS_SB(sb).nls)
233 unload_nls(HFSPLUS_SB(sb).nls);
234 kfree(sb->s_fs_info);
235 sb->s_fs_info = NULL;
236
237 unlock_kernel();
238}
239
240static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
241{
242 struct super_block *sb = dentry->d_sb;
243 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
244
245 buf->f_type = HFSPLUS_SUPER_MAGIC;
246 buf->f_bsize = sb->s_blocksize;
247 buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
248 buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
249 buf->f_bavail = buf->f_bfree;
250 buf->f_files = 0xFFFFFFFF;
251 buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
252 buf->f_fsid.val[0] = (u32)id;
253 buf->f_fsid.val[1] = (u32)(id >> 32);
254 buf->f_namelen = HFSPLUS_MAX_STRLEN;
255
256 return 0;
257}
258
259static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
260{
261 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
262 return 0;
263 if (!(*flags & MS_RDONLY)) {
264 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
265 struct hfsplus_sb_info sbi;
266
267 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
268 sbi.nls = HFSPLUS_SB(sb).nls;
269 if (!hfsplus_parse_options(data, &sbi))
270 return -EINVAL;
271
272 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
273 printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
274 "running fsck.hfsplus is recommended. leaving read-only.\n");
275 sb->s_flags |= MS_RDONLY;
276 *flags |= MS_RDONLY;
277 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
278
279 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
280 printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
281 sb->s_flags |= MS_RDONLY;
282 *flags |= MS_RDONLY;
283 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
284 printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
285 sb->s_flags |= MS_RDONLY;
286 *flags |= MS_RDONLY;
287 }
288 }
289 return 0;
290}
291
292static const struct super_operations hfsplus_sops = {
293 .alloc_inode = hfsplus_alloc_inode,
294 .destroy_inode = hfsplus_destroy_inode,
295 .write_inode = hfsplus_write_inode,
296 .clear_inode = hfsplus_clear_inode,
297 .put_super = hfsplus_put_super,
298 .write_super = hfsplus_write_super,
299 .sync_fs = hfsplus_sync_fs,
300 .statfs = hfsplus_statfs,
301 .remount_fs = hfsplus_remount,
302 .show_options = hfsplus_show_options,
303};
304
305static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
306{
307 struct hfsplus_vh *vhdr;
308 struct hfsplus_sb_info *sbi;
309 hfsplus_cat_entry entry;
310 struct hfs_find_data fd;
311 struct inode *root, *inode;
312 struct qstr str;
313 struct nls_table *nls = NULL;
314 int err = -EINVAL;
315
316 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
317 if (!sbi)
318 return -ENOMEM;
319
320 sb->s_fs_info = sbi;
321 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
322 hfsplus_fill_defaults(sbi);
323 if (!hfsplus_parse_options(data, sbi)) {
324 printk(KERN_ERR "hfs: unable to parse mount options\n");
325 err = -EINVAL;
326 goto cleanup;
327 }
328
329
330 nls = sbi->nls;
331 sbi->nls = load_nls("utf8");
332 if (!sbi->nls) {
333 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
334 err = -EINVAL;
335 goto cleanup;
336 }
337
338
339 if (hfsplus_read_wrapper(sb)) {
340 if (!silent)
341 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
342 err = -EINVAL;
343 goto cleanup;
344 }
345 vhdr = HFSPLUS_SB(sb).s_vhdr;
346
347
348 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
349 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
350 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
351 printk(KERN_ERR "hfs: wrong filesystem version\n");
352 goto cleanup;
353 }
354 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
355 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
356 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
357 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
358 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
359 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
360 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
361 if (!HFSPLUS_SB(sb).data_clump_blocks)
362 HFSPLUS_SB(sb).data_clump_blocks = 1;
363 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
364 if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
365 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
366
367
368 sb->s_op = &hfsplus_sops;
369 sb->s_maxbytes = MAX_LFS_FILESIZE;
370
371 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
372 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
373 "running fsck.hfsplus is recommended. mounting read-only.\n");
374 sb->s_flags |= MS_RDONLY;
375 } else if (sbi->flags & HFSPLUS_SB_FORCE) {
376
377 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
378 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
379 sb->s_flags |= MS_RDONLY;
380 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
381 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
382 "use the force option at your own risk, mounting read-only.\n");
383 sb->s_flags |= MS_RDONLY;
384 }
385 sbi->flags &= ~HFSPLUS_SB_FORCE;
386
387
388 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
389 if (!HFSPLUS_SB(sb).ext_tree) {
390 printk(KERN_ERR "hfs: failed to load extents file\n");
391 goto cleanup;
392 }
393 HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
394 if (!HFSPLUS_SB(sb).cat_tree) {
395 printk(KERN_ERR "hfs: failed to load catalog file\n");
396 goto cleanup;
397 }
398
399 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
400 if (IS_ERR(inode)) {
401 printk(KERN_ERR "hfs: failed to load allocation file\n");
402 err = PTR_ERR(inode);
403 goto cleanup;
404 }
405 HFSPLUS_SB(sb).alloc_file = inode;
406
407
408 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
409 if (IS_ERR(root)) {
410 printk(KERN_ERR "hfs: failed to load root directory\n");
411 err = PTR_ERR(root);
412 goto cleanup;
413 }
414 sb->s_root = d_alloc_root(root);
415 if (!sb->s_root) {
416 iput(root);
417 err = -ENOMEM;
418 goto cleanup;
419 }
420 sb->s_root->d_op = &hfsplus_dentry_operations;
421
422 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
423 str.name = HFSP_HIDDENDIR_NAME;
424 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
425 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
426 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
427 hfs_find_exit(&fd);
428 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
429 goto cleanup;
430 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
431 if (IS_ERR(inode)) {
432 err = PTR_ERR(inode);
433 goto cleanup;
434 }
435 HFSPLUS_SB(sb).hidden_dir = inode;
436 } else
437 hfs_find_exit(&fd);
438
439 if (sb->s_flags & MS_RDONLY)
440 goto out;
441
442
443
444
445 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
446 vhdr->modify_date = hfsp_now2mt();
447 be32_add_cpu(&vhdr->write_count, 1);
448 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
449 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
450 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
451 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
452
453 if (!HFSPLUS_SB(sb).hidden_dir) {
454 printk(KERN_DEBUG "hfs: create hidden dir...\n");
455 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
456 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
457 &str, HFSPLUS_SB(sb).hidden_dir);
458 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
459 }
460out:
461 unload_nls(sbi->nls);
462 sbi->nls = nls;
463 return 0;
464
465cleanup:
466 hfsplus_put_super(sb);
467 if (nls)
468 unload_nls(nls);
469 return err;
470}
471
472MODULE_AUTHOR("Brad Boyer");
473MODULE_DESCRIPTION("Extended Macintosh Filesystem");
474MODULE_LICENSE("GPL");
475
476static struct kmem_cache *hfsplus_inode_cachep;
477
478static struct inode *hfsplus_alloc_inode(struct super_block *sb)
479{
480 struct hfsplus_inode_info *i;
481
482 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
483 return i ? &i->vfs_inode : NULL;
484}
485
486static void hfsplus_destroy_inode(struct inode *inode)
487{
488 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
489}
490
491#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
492
493static int hfsplus_get_sb(struct file_system_type *fs_type,
494 int flags, const char *dev_name, void *data,
495 struct vfsmount *mnt)
496{
497 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
498 mnt);
499}
500
501static struct file_system_type hfsplus_fs_type = {
502 .owner = THIS_MODULE,
503 .name = "hfsplus",
504 .get_sb = hfsplus_get_sb,
505 .kill_sb = kill_block_super,
506 .fs_flags = FS_REQUIRES_DEV,
507};
508
509static void hfsplus_init_once(void *p)
510{
511 struct hfsplus_inode_info *i = p;
512
513 inode_init_once(&i->vfs_inode);
514}
515
516static int __init init_hfsplus_fs(void)
517{
518 int err;
519
520 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
521 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
522 hfsplus_init_once);
523 if (!hfsplus_inode_cachep)
524 return -ENOMEM;
525 err = register_filesystem(&hfsplus_fs_type);
526 if (err)
527 kmem_cache_destroy(hfsplus_inode_cachep);
528 return err;
529}
530
531static void __exit exit_hfsplus_fs(void)
532{
533 unregister_filesystem(&hfsplus_fs_type);
534 kmem_cache_destroy(hfsplus_inode_cachep);
535}
536
537module_init(init_hfsplus_fs)
538module_exit(exit_hfsplus_fs)
539
