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