Merge branch 'upstream' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6
[linux-2.6] / 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
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
98 static 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
155 static 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
166 static 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
208 static void hfsplus_put_super(struct super_block *sb)
209 {
210         dprint(DBG_SUPER, "hfsplus_put_super\n");
211         if (!sb->s_fs_info)
212                 return;
213         if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
214                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
215
216                 vhdr->modify_date = hfsp_now2mt();
217                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
218                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
219                 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
220                 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
221         }
222
223         hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
224         hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
225         iput(HFSPLUS_SB(sb).alloc_file);
226         iput(HFSPLUS_SB(sb).hidden_dir);
227         brelse(HFSPLUS_SB(sb).s_vhbh);
228         if (HFSPLUS_SB(sb).nls)
229                 unload_nls(HFSPLUS_SB(sb).nls);
230         kfree(sb->s_fs_info);
231         sb->s_fs_info = NULL;
232 }
233
234 static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf)
235 {
236         buf->f_type = HFSPLUS_SUPER_MAGIC;
237         buf->f_bsize = sb->s_blocksize;
238         buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
239         buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
240         buf->f_bavail = buf->f_bfree;
241         buf->f_files = 0xFFFFFFFF;
242         buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
243         buf->f_namelen = HFSPLUS_MAX_STRLEN;
244
245         return 0;
246 }
247
248 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
249 {
250         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
251                 return 0;
252         if (!(*flags & MS_RDONLY)) {
253                 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
254
255                 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
256                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
257                                "running fsck.hfsplus is recommended.  leaving read-only.\n");
258                         sb->s_flags |= MS_RDONLY;
259                         *flags |= MS_RDONLY;
260                 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
261                         printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
262                         sb->s_flags |= MS_RDONLY;
263                         *flags |= MS_RDONLY;
264                 }
265         }
266         return 0;
267 }
268
269 static struct super_operations hfsplus_sops = {
270         .alloc_inode    = hfsplus_alloc_inode,
271         .destroy_inode  = hfsplus_destroy_inode,
272         .read_inode     = hfsplus_read_inode,
273         .write_inode    = hfsplus_write_inode,
274         .clear_inode    = hfsplus_clear_inode,
275         .put_super      = hfsplus_put_super,
276         .write_super    = hfsplus_write_super,
277         .statfs         = hfsplus_statfs,
278         .remount_fs     = hfsplus_remount,
279         .show_options   = hfsplus_show_options,
280 };
281
282 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
283 {
284         struct hfsplus_vh *vhdr;
285         struct hfsplus_sb_info *sbi;
286         hfsplus_cat_entry entry;
287         struct hfs_find_data fd;
288         struct inode *root;
289         struct qstr str;
290         struct nls_table *nls = NULL;
291         int err = -EINVAL;
292
293         sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
294         if (!sbi)
295                 return -ENOMEM;
296
297         memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
298         sb->s_fs_info = sbi;
299         INIT_HLIST_HEAD(&sbi->rsrc_inodes);
300         hfsplus_fill_defaults(sbi);
301         if (!hfsplus_parse_options(data, sbi)) {
302                 if (!silent)
303                         printk("HFS+-fs: unable to parse mount options\n");
304                 err = -EINVAL;
305                 goto cleanup;
306         }
307
308         /* temporarily use utf8 to correctly find the hidden dir below */
309         nls = sbi->nls;
310         sbi->nls = load_nls("utf8");
311         if (!nls) {
312                 printk("HFS+: unable to load nls for utf8\n");
313                 err = -EINVAL;
314                 goto cleanup;
315         }
316
317         /* Grab the volume header */
318         if (hfsplus_read_wrapper(sb)) {
319                 if (!silent)
320                         printk("HFS+-fs: unable to find HFS+ superblock\n");
321                 err = -EINVAL;
322                 goto cleanup;
323         }
324         vhdr = HFSPLUS_SB(sb).s_vhdr;
325
326         /* Copy parts of the volume header into the superblock */
327         sb->s_magic = be16_to_cpu(vhdr->signature);
328         if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
329                 if (!silent)
330                         printk("HFS+-fs: wrong filesystem version\n");
331                 goto cleanup;
332         }
333         HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
334         HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
335         HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
336         HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
337         HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
338         HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
339         HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
340         if (!HFSPLUS_SB(sb).data_clump_blocks)
341                 HFSPLUS_SB(sb).data_clump_blocks = 1;
342         HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
343         if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
344                 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
345
346         /* Set up operations so we can load metadata */
347         sb->s_op = &hfsplus_sops;
348         sb->s_maxbytes = MAX_LFS_FILESIZE;
349
350         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
351                 if (!silent)
352                         printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
353                                "running fsck.hfsplus is recommended.  mounting read-only.\n");
354                 sb->s_flags |= MS_RDONLY;
355         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
356                 if (!silent)
357                         printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
358                 sb->s_flags |= MS_RDONLY;
359         }
360
361         /* Load metadata objects (B*Trees) */
362         HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
363         if (!HFSPLUS_SB(sb).ext_tree) {
364                 if (!silent)
365                         printk("HFS+-fs: failed to load extents file\n");
366                 goto cleanup;
367         }
368         HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
369         if (!HFSPLUS_SB(sb).cat_tree) {
370                 if (!silent)
371                         printk("HFS+-fs: failed to load catalog file\n");
372                 goto cleanup;
373         }
374
375         HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
376         if (!HFSPLUS_SB(sb).alloc_file) {
377                 if (!silent)
378                         printk("HFS+-fs: failed to load allocation file\n");
379                 goto cleanup;
380         }
381
382         /* Load the root directory */
383         root = iget(sb, HFSPLUS_ROOT_CNID);
384         sb->s_root = d_alloc_root(root);
385         if (!sb->s_root) {
386                 if (!silent)
387                         printk("HFS+-fs: failed to load root directory\n");
388                 iput(root);
389                 goto cleanup;
390         }
391
392         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
393         str.name = HFSP_HIDDENDIR_NAME;
394         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
395         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
396         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
397                 hfs_find_exit(&fd);
398                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
399                         goto cleanup;
400                 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
401                 if (!HFSPLUS_SB(sb).hidden_dir)
402                         goto cleanup;
403         } else
404                 hfs_find_exit(&fd);
405
406         if (sb->s_flags & MS_RDONLY)
407                 goto out;
408
409         /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
410          * all three are registered with Apple for our use
411          */
412         vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
413         vhdr->modify_date = hfsp_now2mt();
414         vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
415         vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
416         vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
417         mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
418         sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
419
420         if (!HFSPLUS_SB(sb).hidden_dir) {
421                 printk("HFS+: create hidden dir...\n");
422                 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
423                 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
424                                    &str, HFSPLUS_SB(sb).hidden_dir);
425                 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
426         }
427 out:
428         unload_nls(sbi->nls);
429         sbi->nls = nls;
430         return 0;
431
432 cleanup:
433         hfsplus_put_super(sb);
434         if (nls)
435                 unload_nls(nls);
436         return err;
437 }
438
439 MODULE_AUTHOR("Brad Boyer");
440 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
441 MODULE_LICENSE("GPL");
442
443 static kmem_cache_t *hfsplus_inode_cachep;
444
445 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
446 {
447         struct hfsplus_inode_info *i;
448
449         i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
450         return i ? &i->vfs_inode : NULL;
451 }
452
453 static void hfsplus_destroy_inode(struct inode *inode)
454 {
455         kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
456 }
457
458 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
459
460 static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
461                                           int flags, const char *dev_name, void *data)
462 {
463         return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
464 }
465
466 static struct file_system_type hfsplus_fs_type = {
467         .owner          = THIS_MODULE,
468         .name           = "hfsplus",
469         .get_sb         = hfsplus_get_sb,
470         .kill_sb        = kill_block_super,
471         .fs_flags       = FS_REQUIRES_DEV,
472 };
473
474 static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
475 {
476         struct hfsplus_inode_info *i = p;
477
478         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
479                 inode_init_once(&i->vfs_inode);
480 }
481
482 static int __init init_hfsplus_fs(void)
483 {
484         int err;
485
486         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
487                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
488                 hfsplus_init_once, NULL);
489         if (!hfsplus_inode_cachep)
490                 return -ENOMEM;
491         err = register_filesystem(&hfsplus_fs_type);
492         if (err)
493                 kmem_cache_destroy(hfsplus_inode_cachep);
494         return err;
495 }
496
497 static void __exit exit_hfsplus_fs(void)
498 {
499         unregister_filesystem(&hfsplus_fs_type);
500         if (kmem_cache_destroy(hfsplus_inode_cachep))
501                 printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
502 }
503
504 module_init(init_hfsplus_fs)
505 module_exit(exit_hfsplus_fs)