2 * linux/fs/hfsplus/super.c
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/pagemap.h>
14 #include <linux/slab.h>
15 #include <linux/vfs.h>
16 #include <linux/nls.h>
18 static struct inode *hfsplus_alloc_inode(struct super_block *sb);
19 static void hfsplus_destroy_inode(struct inode *inode);
21 #include "hfsplus_fs.h"
23 static void hfsplus_read_inode(struct inode *inode)
25 struct hfs_find_data fd;
26 struct hfsplus_vh *vhdr;
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);
35 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
37 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
38 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
40 err = hfsplus_cat_read_inode(inode, &fd);
46 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
47 switch(inode->i_ino) {
48 case HFSPLUS_ROOT_CNID:
50 case HFSPLUS_EXT_CNID:
51 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
52 inode->i_mapping->a_ops = &hfsplus_btree_aops;
54 case HFSPLUS_CAT_CNID:
55 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
56 inode->i_mapping->a_ops = &hfsplus_btree_aops;
58 case HFSPLUS_ALLOC_CNID:
59 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
60 inode->i_mapping->a_ops = &hfsplus_aops;
62 case HFSPLUS_START_CNID:
63 hfsplus_inode_read_fork(inode, &vhdr->start_file);
65 case HFSPLUS_ATTR_CNID:
66 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
67 inode->i_mapping->a_ops = &hfsplus_btree_aops;
76 make_bad_inode(inode);
79 static int hfsplus_write_inode(struct inode *inode, int unused)
81 struct hfsplus_vh *vhdr;
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);
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);
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;
99 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
100 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
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;
107 hfsplus_inode_write_fork(inode, &vhdr->cat_file);
108 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
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;
115 hfsplus_inode_write_fork(inode, &vhdr->alloc_file);
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;
122 hfsplus_inode_write_fork(inode, &vhdr->start_file);
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;
129 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
130 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
136 static void hfsplus_clear_inode(struct inode *inode)
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);
145 static void hfsplus_write_super(struct super_block *sb)
147 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
149 dprint(DBG_SUPER, "hfsplus_write_super\n");
151 if (sb->s_flags & MS_RDONLY)
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);
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;
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);
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);
180 printk(KERN_WARNING "hfs: backup not found!\n");
183 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
187 static void hfsplus_put_super(struct super_block *sb)
189 dprint(DBG_SUPER, "hfsplus_put_super\n");
192 if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
193 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
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);
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;
213 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
215 struct super_block *sb = dentry->d_sb;
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;
229 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
231 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
233 if (!(*flags & MS_RDONLY)) {
234 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
235 struct hfsplus_sb_info sbi;
237 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
238 sbi.nls = HFSPLUS_SB(sb).nls;
239 if (!hfsplus_parse_options(data, &sbi))
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;
247 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
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;
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;
262 static 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,
275 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
277 struct hfsplus_vh *vhdr;
278 struct hfsplus_sb_info *sbi;
279 hfsplus_cat_entry entry;
280 struct hfs_find_data fd;
283 struct nls_table *nls = NULL;
286 sbi = kmalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL);
290 memset(sbi, 0, sizeof(HFSPLUS_SB(sb)));
292 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
293 hfsplus_fill_defaults(sbi);
294 if (!hfsplus_parse_options(data, sbi)) {
295 printk(KERN_ERR "hfs: unable to parse mount options\n");
300 /* temporarily use utf8 to correctly find the hidden dir below */
302 sbi->nls = load_nls("utf8");
304 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
309 /* Grab the volume header */
310 if (hfsplus_read_wrapper(sb)) {
312 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
316 vhdr = HFSPLUS_SB(sb).s_vhdr;
318 /* Copy parts of the volume header into the superblock */
319 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
320 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
321 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
322 printk(KERN_ERR "hfs: wrong filesystem version\n");
325 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
326 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
327 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
328 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
329 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
330 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
331 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
332 if (!HFSPLUS_SB(sb).data_clump_blocks)
333 HFSPLUS_SB(sb).data_clump_blocks = 1;
334 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
335 if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
336 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
338 /* Set up operations so we can load metadata */
339 sb->s_op = &hfsplus_sops;
340 sb->s_maxbytes = MAX_LFS_FILESIZE;
342 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
343 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
344 "running fsck.hfsplus is recommended. mounting read-only.\n");
345 sb->s_flags |= MS_RDONLY;
346 } else if (sbi->flags & HFSPLUS_SB_FORCE) {
348 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
349 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
350 sb->s_flags |= MS_RDONLY;
351 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
352 printk(KERN_WARNING "hfs: write access to a jounaled filesystem is not supported, "
353 "use the force option at your own risk, mounting read-only.\n");
354 sb->s_flags |= MS_RDONLY;
356 sbi->flags &= ~HFSPLUS_SB_FORCE;
358 /* Load metadata objects (B*Trees) */
359 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
360 if (!HFSPLUS_SB(sb).ext_tree) {
361 printk(KERN_ERR "hfs: failed to load extents file\n");
364 HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
365 if (!HFSPLUS_SB(sb).cat_tree) {
366 printk(KERN_ERR "hfs: failed to load catalog file\n");
370 HFSPLUS_SB(sb).alloc_file = iget(sb, HFSPLUS_ALLOC_CNID);
371 if (!HFSPLUS_SB(sb).alloc_file) {
372 printk(KERN_ERR "hfs: failed to load allocation file\n");
376 /* Load the root directory */
377 root = iget(sb, HFSPLUS_ROOT_CNID);
378 sb->s_root = d_alloc_root(root);
380 printk(KERN_ERR "hfs: failed to load root directory\n");
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))) {
391 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
393 HFSPLUS_SB(sb).hidden_dir = iget(sb, be32_to_cpu(entry.folder.id));
394 if (!HFSPLUS_SB(sb).hidden_dir)
399 if (sb->s_flags & MS_RDONLY)
402 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
403 * all three are registered with Apple for our use
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);
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);
421 unload_nls(sbi->nls);
426 hfsplus_put_super(sb);
432 MODULE_AUTHOR("Brad Boyer");
433 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
434 MODULE_LICENSE("GPL");
436 static struct kmem_cache *hfsplus_inode_cachep;
438 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
440 struct hfsplus_inode_info *i;
442 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
443 return i ? &i->vfs_inode : NULL;
446 static void hfsplus_destroy_inode(struct inode *inode)
448 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
451 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
453 static int hfsplus_get_sb(struct file_system_type *fs_type,
454 int flags, const char *dev_name, void *data,
455 struct vfsmount *mnt)
457 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
461 static struct file_system_type hfsplus_fs_type = {
462 .owner = THIS_MODULE,
464 .get_sb = hfsplus_get_sb,
465 .kill_sb = kill_block_super,
466 .fs_flags = FS_REQUIRES_DEV,
469 static void hfsplus_init_once(void *p, struct kmem_cache *cachep, unsigned long flags)
471 struct hfsplus_inode_info *i = p;
473 if (flags & SLAB_CTOR_CONSTRUCTOR)
474 inode_init_once(&i->vfs_inode);
477 static int __init init_hfsplus_fs(void)
481 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
482 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
483 hfsplus_init_once, NULL);
484 if (!hfsplus_inode_cachep)
486 err = register_filesystem(&hfsplus_fs_type);
488 kmem_cache_destroy(hfsplus_inode_cachep);
492 static void __exit exit_hfsplus_fs(void)
494 unregister_filesystem(&hfsplus_fs_type);
495 kmem_cache_destroy(hfsplus_inode_cachep);
498 module_init(init_hfsplus_fs)
499 module_exit(exit_hfsplus_fs)