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