initial commit with v2.6.9
[linux-2.6.9-moxart.git] / fs / hfsplus / super.c
blob4ff176a0bb58380bfe38f83bfc16a39bc63390ee
1 /*
2 * linux/fs/hfsplus/super.c
4 * Copyright (C) 2001
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
8 */
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>
20 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
21 static void hfsplus_destroy_inode(struct inode *inode);
23 #include "hfsplus_fs.h"
25 void hfsplus_inode_check(struct super_block *sb)
27 #if 0
28 u32 cnt = atomic_read(&HFSPLUS_SB(sb).inode_cnt);
29 u32 last_cnt = HFSPLUS_SB(sb).last_inode_cnt;
31 if (cnt <= (last_cnt / 2) ||
32 cnt >= (last_cnt * 2)) {
33 HFSPLUS_SB(sb).last_inode_cnt = cnt;
34 printk("inode_check: %u,%u,%u\n", cnt, last_cnt,
35 HFSPLUS_SB(sb).cat_tree ? HFSPLUS_SB(sb).cat_tree->node_hash_cnt : 0);
37 #endif
40 static void hfsplus_read_inode(struct inode *inode)
42 struct hfs_find_data fd;
43 struct hfsplus_vh *vhdr;
44 int err;
46 atomic_inc(&HFSPLUS_SB(inode->i_sb).inode_cnt);
47 hfsplus_inode_check(inode->i_sb);
48 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
49 init_MUTEX(&HFSPLUS_I(inode).extents_lock);
50 HFSPLUS_I(inode).flags = 0;
51 HFSPLUS_I(inode).rsrc_inode = NULL;
53 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
54 read_inode:
55 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
56 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
57 if (!err)
58 err = hfsplus_cat_read_inode(inode, &fd);
59 hfs_find_exit(&fd);
60 if (err)
61 goto bad_inode;
62 return;
64 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
65 switch(inode->i_ino) {
66 case HFSPLUS_ROOT_CNID:
67 goto read_inode;
68 case HFSPLUS_EXT_CNID:
69 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
70 inode->i_mapping->a_ops = &hfsplus_btree_aops;
71 break;
72 case HFSPLUS_CAT_CNID:
73 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
74 inode->i_mapping->a_ops = &hfsplus_btree_aops;
75 break;
76 case HFSPLUS_ALLOC_CNID:
77 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
78 inode->i_mapping->a_ops = &hfsplus_aops;
79 break;
80 case HFSPLUS_START_CNID:
81 hfsplus_inode_read_fork(inode, &vhdr->start_file);
82 break;
83 case HFSPLUS_ATTR_CNID:
84 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
85 inode->i_mapping->a_ops = &hfsplus_btree_aops;
86 break;
87 default:
88 goto bad_inode;
91 return;
93 bad_inode:
94 make_bad_inode(inode);
97 int hfsplus_write_inode(struct inode *inode, int unused)
99 struct hfsplus_vh *vhdr;
100 int ret = 0;
102 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
103 hfsplus_ext_write_extent(inode);
104 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
105 return hfsplus_cat_write_inode(inode);
107 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
108 switch (inode->i_ino) {
109 case HFSPLUS_ROOT_CNID:
110 ret = hfsplus_cat_write_inode(inode);
111 break;
112 case HFSPLUS_EXT_CNID:
113 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
114 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
115 inode->i_sb->s_dirt = 1;
117 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
118 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
119 break;
120 case HFSPLUS_CAT_CNID:
121 if (vhdr->cat_file.total_size != cpu_to_be64(inode->i_size)) {
122 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
123 inode->i_sb->s_dirt = 1;
125 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
126 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
127 break;
128 case HFSPLUS_ALLOC_CNID:
129 if (vhdr->alloc_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;
133 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
134 break;
135 case HFSPLUS_START_CNID:
136 if (vhdr->start_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;
140 hfsplus_inode_write_fork(inode, &vhdr->start_file);
141 break;
142 case HFSPLUS_ATTR_CNID:
143 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
144 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
145 inode->i_sb->s_dirt = 1;
147 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
148 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
149 break;
151 return ret;
154 static void hfsplus_clear_inode(struct inode *inode)
156 dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
157 atomic_dec(&HFSPLUS_SB(inode->i_sb).inode_cnt);
158 if (HFSPLUS_IS_RSRC(inode)) {
159 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
160 iput(HFSPLUS_I(inode).rsrc_inode);
162 hfsplus_inode_check(inode->i_sb);
165 static void hfsplus_write_super(struct super_block *sb)
167 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
169 dprint(DBG_SUPER, "hfsplus_write_super\n");
170 sb->s_dirt = 0;
171 if (sb->s_flags & MS_RDONLY)
172 /* warn? */
173 return;
175 vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
176 vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
177 vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
178 vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
179 vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
181 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
182 if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
183 if (HFSPLUS_SB(sb).sect_count) {
184 struct buffer_head *bh;
185 u32 block, offset;
187 block = HFSPLUS_SB(sb).blockoffset;
188 block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
189 offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
190 printk("backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
191 HFSPLUS_SB(sb).sect_count, block, offset);
192 bh = sb_bread(sb, block);
193 if (bh) {
194 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
195 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
196 memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
197 mark_buffer_dirty(bh);
198 brelse(bh);
199 } else
200 printk("backup not found!\n");
203 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
207 static void hfsplus_put_super(struct super_block *sb)
209 dprint(DBG_SUPER, "hfsplus_put_super\n");
210 if (!(sb->s_flags & MS_RDONLY)) {
211 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
213 vhdr->modify_date = hfsp_now2mt();
214 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
215 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
216 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
217 ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
218 wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
221 hfs_btree_close(HFSPLUS_SB(sb).cat_tree);
222 hfs_btree_close(HFSPLUS_SB(sb).ext_tree);
223 iput(HFSPLUS_SB(sb).alloc_file);
224 iput(HFSPLUS_SB(sb).hidden_dir);
225 brelse(HFSPLUS_SB(sb).s_vhbh);
228 static int hfsplus_statfs(struct super_block *sb, struct kstatfs *buf)
230 buf->f_type = HFSPLUS_SUPER_MAGIC;
231 buf->f_bsize = sb->s_blocksize;
232 buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
233 buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
234 buf->f_bavail = buf->f_bfree;
235 buf->f_files = 0xFFFFFFFF;
236 buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
237 buf->f_namelen = HFSPLUS_MAX_STRLEN;
239 return 0;
242 int hfsplus_remount(struct super_block *sb, int *flags, char *data)
244 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
245 return 0;
246 if (!(*flags & MS_RDONLY)) {
247 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
249 if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_INCNSTNT)) ||
250 !(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
251 printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
252 "running fsck.hfsplus is recommended. leaving read-only.\n");
253 sb->s_flags |= MS_RDONLY;
254 *flags |= MS_RDONLY;
255 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
256 printk("HFS+-fs: Filesystem is marked locked, leaving read-only.\n");
257 sb->s_flags |= MS_RDONLY;
258 *flags |= MS_RDONLY;
261 return 0;
264 static struct super_operations hfsplus_sops = {
265 .alloc_inode = hfsplus_alloc_inode,
266 .destroy_inode = hfsplus_destroy_inode,
267 .read_inode = hfsplus_read_inode,
268 .write_inode = hfsplus_write_inode,
269 .clear_inode = hfsplus_clear_inode,
270 .put_super = hfsplus_put_super,
271 .write_super = hfsplus_write_super,
272 .statfs = hfsplus_statfs,
273 .remount_fs = hfsplus_remount,
276 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
278 struct hfsplus_vh *vhdr;
279 struct hfsplus_sb_info *sbi;
280 hfsplus_cat_entry entry;
281 struct hfs_find_data fd;
282 struct inode *root;
283 struct qstr str;
284 int err = -EINVAL;
286 sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
287 if (!sbi) {
288 err = -ENOMEM;
289 goto out2;
291 memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
292 sb->s_fs_info = sbi;
293 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
294 fill_defaults(sbi);
295 if (!parse_options(data, sbi)) {
296 if (!silent)
297 printk("HFS+-fs: unable to parse mount options\n");
298 err = -EINVAL;
299 goto out2;
302 /* Grab the volume header */
303 if (hfsplus_read_wrapper(sb)) {
304 if (!silent)
305 printk("HFS+-fs: unable to find HFS+ superblock\n");
306 err = -EINVAL;
307 goto out2;
309 vhdr = HFSPLUS_SB(sb).s_vhdr;
311 /* Copy parts of the volume header into the superblock */
312 sb->s_magic = be16_to_cpu(vhdr->signature);
313 if (be16_to_cpu(vhdr->version) != HFSPLUS_CURRENT_VERSION) {
314 if (!silent)
315 printk("HFS+-fs: wrong filesystem version\n");
316 goto cleanup;
318 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
319 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
320 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
321 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
322 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
323 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
324 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
325 if (!HFSPLUS_SB(sb).data_clump_blocks)
326 HFSPLUS_SB(sb).data_clump_blocks = 1;
327 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
328 if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
329 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
331 /* Set up operations so we can load metadata */
332 sb->s_op = &hfsplus_sops;
333 sb->s_maxbytes = MAX_LFS_FILESIZE;
335 if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_INCNSTNT)) ||
336 !(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
337 if (!silent)
338 printk("HFS+-fs warning: Filesystem was not cleanly unmounted, "
339 "running fsck.hfsplus is recommended. mounting read-only.\n");
340 sb->s_flags |= MS_RDONLY;
341 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
342 if (!silent)
343 printk("HFS+-fs: Filesystem is marked locked, mounting read-only.\n");
344 sb->s_flags |= MS_RDONLY;
347 /* Load metadata objects (B*Trees) */
348 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
349 if (!HFSPLUS_SB(sb).ext_tree) {
350 if (!silent)
351 printk("HFS+-fs: failed to load extents file\n");
352 goto cleanup;
354 HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
355 if (!HFSPLUS_SB(sb).cat_tree) {
356 if (!silent)
357 printk("HFS+-fs: failed to load catalog file\n");
358 goto cleanup;
361 HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
362 if (!HFSPLUS_SB(sb).alloc_file) {
363 if (!silent)
364 printk("HFS+-fs: failed to load allocation file\n");
365 goto cleanup;
368 /* Load the root directory */
369 root = iget(sb, HFSPLUS_ROOT_CNID);
370 sb->s_root = d_alloc_root(root);
371 if (!sb->s_root) {
372 if (!silent)
373 printk("HFS+-fs: failed to load root directory\n");
374 iput(root);
375 goto cleanup;
378 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
379 str.name = HFSP_HIDDENDIR_NAME;
380 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
381 hfsplus_cat_build_key(fd.search_key, HFSPLUS_ROOT_CNID, &str);
382 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
383 hfs_find_exit(&fd);
384 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
385 goto cleanup;
386 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
387 if (!HFSPLUS_SB(sb).hidden_dir)
388 goto cleanup;
389 } else
390 hfs_find_exit(&fd);
392 if (sb->s_flags & MS_RDONLY)
393 goto out;
395 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
396 * all three are registered with Apple for our use
398 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
399 vhdr->modify_date = hfsp_now2mt();
400 vhdr->write_count = cpu_to_be32(be32_to_cpu(vhdr->write_count) + 1);
401 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
402 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
403 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
404 ll_rw_block(WRITE, 1, &HFSPLUS_SB(sb).s_vhbh);
405 wait_on_buffer(HFSPLUS_SB(sb).s_vhbh);
407 if (!HFSPLUS_SB(sb).hidden_dir) {
408 printk("HFS+: create hidden dir...\n");
409 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
410 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
411 &str, HFSPLUS_SB(sb).hidden_dir);
412 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
414 out:
415 return 0;
417 cleanup:
418 hfsplus_put_super(sb);
419 out2:
420 return err;
423 MODULE_AUTHOR("Brad Boyer");
424 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
425 MODULE_LICENSE("GPL");
427 static kmem_cache_t *hfsplus_inode_cachep;
429 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
431 struct hfsplus_inode_info *i;
433 i = kmem_cache_alloc(hfsplus_inode_cachep, SLAB_KERNEL);
434 return i ? &i->vfs_inode : NULL;
437 static void hfsplus_destroy_inode(struct inode *inode)
439 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
442 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
444 static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
445 int flags, const char *dev_name, void *data)
447 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
450 static struct file_system_type hfsplus_fs_type = {
451 .owner = THIS_MODULE,
452 .name = "hfsplus",
453 .get_sb = hfsplus_get_sb,
454 .kill_sb = kill_block_super,
455 .fs_flags = FS_REQUIRES_DEV,
458 static void hfsplus_init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
460 struct hfsplus_inode_info *i = p;
462 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
463 inode_init_once(&i->vfs_inode);
466 static int __init init_hfsplus_fs(void)
468 int err;
470 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
471 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
472 hfsplus_init_once, NULL);
473 if (!hfsplus_inode_cachep)
474 return -ENOMEM;
475 err = register_filesystem(&hfsplus_fs_type);
476 if (err)
477 kmem_cache_destroy(hfsplus_inode_cachep);
478 return err;
481 static void __exit exit_hfsplus_fs(void)
483 unregister_filesystem(&hfsplus_fs_type);
484 if (kmem_cache_destroy(hfsplus_inode_cachep))
485 printk(KERN_INFO "hfsplus_inode_cache: not all structures were freed\n");
488 module_init(init_hfsplus_fs)
489 module_exit(exit_hfsplus_fs)