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-rw-r--r--fs/hfsplus/super.c502
1 files changed, 502 insertions, 0 deletions
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
new file mode 100644
index 000000000000..5f8044664a3c
--- /dev/null
+++ b/fs/hfsplus/super.c
@@ -0,0 +1,502 @@
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/config.h>
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/pagemap.h>
14#include <linux/fs.h>
15#include <linux/sched.h>
16#include <linux/slab.h>
17#include <linux/version.h>
18#include <linux/vfs.h>
19#include <linux/nls.h>
20
21static struct inode *hfsplus_alloc_inode(struct super_block *sb);
22static void hfsplus_destroy_inode(struct inode *inode);
23
24#include "hfsplus_fs.h"
25
26void hfsplus_inode_check(struct super_block *sb)
27{
28#if 0
29 u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
30 u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;
31
32 if (cnt <= (last_cnt / 2) ||
33 cnt >= (last_cnt * 2)) {
34 HFSPLUS_SB(sb).last_inode_cnt = cnt;
35 printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
36 HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
37 }
38#endif
39}
40
41static void hfsplus_read_inode(struct inode *inode)
42{
43 struct hfs_find_data fd;
44 struct hfsplus_vh *vhdr;
45 int err;
46
47 atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
48 hfsplus_inode_check(inode->i_sb);
49 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
50 init_MUTEX(&HFSPLUS_I(inode).extents_lock);
51 HFSPLUS_I(inode).flags = 0;
52 HFSPLUS_I(inode).rsrc_inode = NULL;
53
54 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
55 read_inode:
56 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
57 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
58 if (!err)
59 err = hfsplus_cat_read_inode(inode, &fd);
60 hfs_find_exit(&fd);
61 if (err)
62 goto bad_inode;
63 return;
64 }
65 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
66 switch(inode->i_ino) {
67 case HFSPLUS_ROOT_CNID:
68 goto read_inode;
69 case HFSPLUS_EXT_CNID:
70 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
71 inode->i_mapping->a_ops = &hfsplus_btree_aops;
72 break;
73 case HFSPLUS_CAT_CNID:
74 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
75 inode->i_mapping->a_ops = &hfsplus_btree_aops;
76 break;
77 case HFSPLUS_ALLOC_CNID:
78 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
79 inode->i_mapping->a_ops = &hfsplus_aops;
80 break;
81 case HFSPLUS_START_CNID:
82 hfsplus_inode_read_fork(inode, &vhdr->start_file);
83 break;
84 case HFSPLUS_ATTR_CNID:
85 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
86 inode->i_mapping->a_ops = &hfsplus_btree_aops;
87 break;
88 default:
89 goto bad_inode;
90 }
91
92 return;
93
94 bad_inode:
95 make_bad_inode(inode);
96}
97
98static int hfsplus_write_inode(struct inode *inode, int unused)
99{
100 struct hfsplus_vh *vhdr;
101 int ret = 0;
102
103 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
104 hfsplus_ext_write_extent(inode);
105 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
106 return hfsplus_cat_write_inode(inode);
107 }
108 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
109 switch (inode->i_ino) {
110 case HFSPLUS_ROOT_CNID:
111 ret = hfsplus_cat_write_inode(inode);
112 break;
113 case HFSPLUS_EXT_CNID:
114 if (vhdr->ext_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->ext_file);
119 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
120 break;
121 case HFSPLUS_CAT_CNID:
122 if (vhdr->cat_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->cat_file);
127 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
128 break;
129 case HFSPLUS_ALLOC_CNID:
130 if (vhdr->alloc_file.total_size != cpu_to_be64(inode->i_size)) {
131 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
132 inode->i_sb->s_dirt = 1;
133 }
134 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
135 break;
136 case HFSPLUS_START_CNID:
137 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
138 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
139 inode->i_sb->s_dirt = 1;
140 }
141 hfsplus_inode_write_fork(inode, &vhdr->start_file);
142 break;
143 case HFSPLUS_ATTR_CNID:
144 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
145 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
146 inode->i_sb->s_dirt = 1;
147 }
148 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
149 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
150 break;
151 }
152 return ret;
153}
154
155static void hfsplus_clear_inode(struct inode *inode)
156{
157 dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
158 atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
159 if (HFSPLUS_IS_RSRC(inode)) {
160 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
161 iput(HFSPLUS_I(inode).rsrc_inode);
162 }
163 hfsplus_inode_check(inode->i_sb);
164}
165
166static void hfsplus_write_super(struct super_block *sb)
167{
168 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
169
170 dprint(DBG_SUPER, "hfsplus_write_super\n");
171 sb->s_dirt = 0;
172 if (sb->s_flags & MS_RDONLY)
173 /* warn? */
174 return;
175
176 vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
177 vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
178 vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
179 vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
180 vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
181
182 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
183 if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
184 if (HFSPLUS_SB(sb).sect_count) {
185 struct buffer_head *bh;
186 u32 block, offset;
187
188 block = HFSPLUS_SB(sb).blockoffset;
189 block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
190 offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
191 printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
192 HFSPLUS_SB(sb).sect_count, block, offset);
193 bh = sb_bread(sb, block);
194 if (bh) {
195 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
196 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
197 memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
198 mark_buffer_dirty(bh);
199 brelse(bh);
200 } else
201 printk("backup not found!\n");
202 }
203 }
204 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
205 }
206}
207
208static void hfsplus_put_super(struct super_block *sb)
209{
210 dprint(DBG_SUPER, "hfsplus_put_super\n");
211 if (!(sb->s_flags & MS_RDONLY)) {
212 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
213
214 vhdr->modify_date = hfsp_now2mt();
215 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
216 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
217 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
218 ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
219 wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
220 }
221
222 hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
223 hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
224 iput(HFSPLUS_SB(sb).alloc_file);
225 iput(HFSPLUS_SB(sb).hidden_dir);
226 brelse(HFSPLUS_SB(sb).s_vhbh);
227 if (HFSPLUS_SB(sb).nls)
228 unload_nls(HFSPLUS_SB(sb).nls);
229}
230
231static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf)
232{
233 buf->f_type = HFSPLUS_SUPER_MAGIC;
234 buf->f_bsize = sb->s_blocksize;
235 buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
236 buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
237 buf->f_bavail = buf->f_bfree;
238 buf->f_files = 0xFFFFFFFF;
239 buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
240 buf->f_namelen = HFSPLUS_MAX_STRLEN;
241
242 return 0;
243}
244
245static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
246{
247 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
248 return 0;
249 if (!(*flags & MS_RDONLY)) {
250 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
251
252 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
253 printk("HFS+-fs warning: 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 (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
258 printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
259 sb->s_flags |= MS_RDONLY;
260 *flags |= MS_RDONLY;
261 }
262 }
263 return 0;
264}
265
266static struct super_operations hfsplus_sops = {
267 .alloc_inode = hfsplus_alloc_inode,
268 .destroy_inode = hfsplus_destroy_inode,
269 .read_inode = hfsplus_read_inode,
270 .write_inode = hfsplus_write_inode,
271 .clear_inode = hfsplus_clear_inode,
272 .put_super = hfsplus_put_super,
273 .write_super = hfsplus_write_super,
274 .statfs = hfsplus_statfs,
275 .remount_fs = hfsplus_remount,
276};
277
278static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
279{
280 struct hfsplus_vh *vhdr;
281 struct hfsplus_sb_info *sbi;
282 hfsplus_cat_entry entry;
283 struct hfs_find_data fd;
284 struct inode *root;
285 struct qstr str;
286 struct nls_table *nls = NULL;
287 int err = -EINVAL;
288
289 sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
290 if (!sbi)
291 return -ENOMEM;
292
293 memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
294 sb->s_fs_info = sbi;
295 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
296 fill_defaults(sbi);
297 if (!parse_options(data, sbi)) {
298 if (!silent)
299 printk("HFS+-fs: unable to parse mount options\n");
300 err = -EINVAL;
301 goto cleanup;
302 }
303
304 /* temporarily use utf8 to correctly find the hidden dir below */
305 nls = sbi->nls;
306 sbi->nls = load_nls("utf8");
307 if (!nls) {
308 printk("HFS+: unable to load nls for utf8\n");
309 err = -EINVAL;
310 goto cleanup;
311 }
312
313 /* Grab the volume header */
314 if (hfsplus_read_wrapper(sb)) {
315 if (!silent)
316 printk("HFS+-fs: unable to find HFS+ superblock\n");
317 err = -EINVAL;
318 goto cleanup;
319 }
320 vhdr = HFSPLUS_SB(sb).s_vhdr;
321
322 /* Copy parts of the volume header into the superblock */
323 sb->s_magic = be16_to_cpu(vhdr->signature);
324 if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
325 if (!silent)
326 printk("HFS+-fs: wrong filesystem version\n");
327 goto cleanup;
328 }
329 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
330 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
331 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
332 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
333 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
334 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
335 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
336 if (!HFSPLUS_SB(sb).data_clump_blocks)
337 HFSPLUS_SB(sb).data_clump_blocks = 1;
338 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
339 if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
340 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
341
342 /* Set up operations so we can load metadata */
343 sb->s_op = &hfsplus_sops;
344 sb->s_maxbytes = MAX_LFS_FILESIZE;
345
346 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
347 if (!silent)
348 printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
349 "running fsck.hfsplus is recommended. mounting read-only.\n");
350 sb->s_flags |= MS_RDONLY;
351 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
352 if (!silent)
353 printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
354 sb->s_flags |= MS_RDONLY;
355 }
356
357 /* Load metadata objects (B*Trees) */
358 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
359 if (!HFSPLUS_SB(sb).ext_tree) {
360 if (!silent)
361 printk("HFS+-fs: failed to load extents file\n");
362 goto cleanup;
363 }
364 HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
365 if (!HFSPLUS_SB(sb).cat_tree) {
366 if (!silent)
367 printk("HFS+-fs: failed to load catalog file\n");
368 goto cleanup;
369 }
370
371 HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
372 if (!HFSPLUS_SB(sb).alloc_file) {
373 if (!silent)
374 printk("HFS+-fs: failed to load allocation file\n");
375 goto cleanup;
376 }
377
378 /* Load the root directory */
379 root = iget(sb, HFSPLUS_ROOT_CNID);
380 sb->s_root = d_alloc_root(root);
381 if (!sb->s_root) {
382 if (!silent)
383 printk("HFS+-fs: failed to load root directory\n");
384 iput(root);
385 goto cleanup;
386 }
387
388 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
389 str.name = HFSP_HIDDENDIR_NAME;
390 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
391 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
392 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
393 hfs_find_exit(&fd);
394 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
395 goto cleanup;
396 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
397 if (!HFSPLUS_SB(sb).hidden_dir)
398 goto cleanup;
399 } else
400 hfs_find_exit(&fd);
401
402 if (sb->s_flags & MS_RDONLY)
403 goto out;
404
405 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
406 * all three are registered with Apple for our use
407 */
408 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
409 vhdr->modify_date = hfsp_now2mt();
410 vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
411 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
412 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
413 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
414 ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
415 wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
416
417 if (!HFSPLUS_SB(sb).hidden_dir) {
418 printk("HFS+: create hidden dir...\n");
419 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
420 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
421 &str, HFSPLUS_SB(sb).hidden_dir);
422 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
423 }
424out:
425 unload_nls(sbi->nls);
426 sbi->nls = nls;
427 return 0;
428
429cleanup:
430 hfsplus_put_super(sb);
431 if (nls)
432 unload_nls(nls);
433 return err;
434}
435
436MODULE_AUTHOR("Brad Boyer");
437MODULE_DESCRIPTION("Extended Macintosh Filesystem");
438MODULE_LICENSE("GPL");
439
440static kmem_cache_t *hfsplus_inode_cachep;
441
442static struct inode *hfsplus_alloc_inode(struct super_block *sb)
443{
444 struct hfsplus_inode_info *i;
445
446 i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
447 return i ? &i->vfs_inode : NULL;
448}
449
450static void hfsplus_destroy_inode(struct inode *inode)
451{
452 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
453}
454
455#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
456
457static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
458 int flags, const char *dev_name, void *data)
459{
460 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
461}
462
463static struct file_system_type hfsplus_fs_type = {
464 .owner = THIS_MODULE,
465 .name = "hfsplus",
466 .get_sb = hfsplus_get_sb,
467 .kill_sb = kill_block_super,
468 .fs_flags = FS_REQUIRES_DEV,
469};
470
471static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
472{
473 struct hfsplus_inode_info *i = p;
474
475 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
476 inode_init_once(&i->vfs_inode);
477}
478
479static int __init init_hfsplus_fs(void)
480{
481 int err;
482
483 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
484 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
485 hfsplus_init_once, NULL);
486 if (!hfsplus_inode_cachep)
487 return -ENOMEM;
488 err = register_filesystem(&hfsplus_fs_type);
489 if (err)
490 kmem_cache_destroy(hfsplus_inode_cachep);
491 return err;
492}
493
494static void __exit exit_hfsplus_fs(void)
495{
496 unregister_filesystem(&hfsplus_fs_type);
497 if (kmem_cache_destroy(hfsplus_inode_cachep))
498 printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
499}
500
501module_init(init_hfsplus_fs)
502module_exit(exit_hfsplus_fs)
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 03:23:56 -0500