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 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino)
25 struct hfs_find_data fd;
26 struct hfsplus_vh *vhdr;
30 inode = iget_locked(sb, ino);
32 return ERR_PTR(-ENOMEM);
33 if (!(inode->i_state & I_NEW))
36 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
37 mutex_init(&HFSPLUS_I(inode).extents_lock);
38 HFSPLUS_I(inode).flags = 0;
39 HFSPLUS_I(inode).rsrc_inode = NULL;
40 atomic_set(&HFSPLUS_I(inode).opencnt, 0);
42 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
44 hfs_find_init(HFSPLUS_SB(inode->i_sb).cat_tree, &fd);
45 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
47 err = hfsplus_cat_read_inode(inode, &fd);
53 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
54 switch(inode->i_ino) {
55 case HFSPLUS_ROOT_CNID:
57 case HFSPLUS_EXT_CNID:
58 hfsplus_inode_read_fork(inode, &vhdr->ext_file);
59 inode->i_mapping->a_ops = &hfsplus_btree_aops;
61 case HFSPLUS_CAT_CNID:
62 hfsplus_inode_read_fork(inode, &vhdr->cat_file);
63 inode->i_mapping->a_ops = &hfsplus_btree_aops;
65 case HFSPLUS_ALLOC_CNID:
66 hfsplus_inode_read_fork(inode, &vhdr->alloc_file);
67 inode->i_mapping->a_ops = &hfsplus_aops;
69 case HFSPLUS_START_CNID:
70 hfsplus_inode_read_fork(inode, &vhdr->start_file);
72 case HFSPLUS_ATTR_CNID:
73 hfsplus_inode_read_fork(inode, &vhdr->attr_file);
74 inode->i_mapping->a_ops = &hfsplus_btree_aops;
81 unlock_new_inode(inode);
89 static int hfsplus_write_inode(struct inode *inode, int unused)
91 struct hfsplus_vh *vhdr;
94 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
95 hfsplus_ext_write_extent(inode);
96 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID) {
97 return hfsplus_cat_write_inode(inode);
99 vhdr = HFSPLUS_SB(inode->i_sb).s_vhdr;
100 switch (inode->i_ino) {
101 case HFSPLUS_ROOT_CNID:
102 ret = hfsplus_cat_write_inode(inode);
104 case HFSPLUS_EXT_CNID:
105 if (vhdr->ext_file.total_size != cpu_to_be64(inode->i_size)) {
106 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
107 inode->i_sb->s_dirt = 1;
109 hfsplus_inode_write_fork(inode, &vhdr->ext_file);
110 hfs_btree_write(HFSPLUS_SB(inode->i_sb).ext_tree);
112 case HFSPLUS_CAT_CNID:
113 if (vhdr->cat_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->cat_file);
118 hfs_btree_write(HFSPLUS_SB(inode->i_sb).cat_tree);
120 case HFSPLUS_ALLOC_CNID:
121 if (vhdr->alloc_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->alloc_file);
127 case HFSPLUS_START_CNID:
128 if (vhdr->start_file.total_size != cpu_to_be64(inode->i_size)) {
129 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
130 inode->i_sb->s_dirt = 1;
132 hfsplus_inode_write_fork(inode, &vhdr->start_file);
134 case HFSPLUS_ATTR_CNID:
135 if (vhdr->attr_file.total_size != cpu_to_be64(inode->i_size)) {
136 HFSPLUS_SB(inode->i_sb).flags |= HFSPLUS_SB_WRITEBACKUP;
137 inode->i_sb->s_dirt = 1;
139 hfsplus_inode_write_fork(inode, &vhdr->attr_file);
140 hfs_btree_write(HFSPLUS_SB(inode->i_sb).attr_tree);
146 static void hfsplus_clear_inode(struct inode *inode)
148 dprint(DBG_INODE, "hfsplus_clear_inode: %lu\n", inode->i_ino);
149 if (HFSPLUS_IS_RSRC(inode)) {
150 HFSPLUS_I(HFSPLUS_I(inode).rsrc_inode).rsrc_inode = NULL;
151 iput(HFSPLUS_I(inode).rsrc_inode);
155 static void hfsplus_write_super(struct super_block *sb)
157 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
159 dprint(DBG_SUPER, "hfsplus_write_super\n");
163 if (sb->s_flags & MS_RDONLY)
167 vhdr->free_blocks = cpu_to_be32(HFSPLUS_SB(sb).free_blocks);
168 vhdr->next_alloc = cpu_to_be32(HFSPLUS_SB(sb).next_alloc);
169 vhdr->next_cnid = cpu_to_be32(HFSPLUS_SB(sb).next_cnid);
170 vhdr->folder_count = cpu_to_be32(HFSPLUS_SB(sb).folder_count);
171 vhdr->file_count = cpu_to_be32(HFSPLUS_SB(sb).file_count);
173 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
174 if (HFSPLUS_SB(sb).flags & HFSPLUS_SB_WRITEBACKUP) {
175 if (HFSPLUS_SB(sb).sect_count) {
176 struct buffer_head *bh;
179 block = HFSPLUS_SB(sb).blockoffset;
180 block += (HFSPLUS_SB(sb).sect_count - 2) >> (sb->s_blocksize_bits - 9);
181 offset = ((HFSPLUS_SB(sb).sect_count - 2) << 9) & (sb->s_blocksize - 1);
182 printk(KERN_DEBUG "hfs: backup: %u,%u,%u,%u\n", HFSPLUS_SB(sb).blockoffset,
183 HFSPLUS_SB(sb).sect_count, block, offset);
184 bh = sb_bread(sb, block);
186 vhdr = (struct hfsplus_vh *)(bh->b_data + offset);
187 if (be16_to_cpu(vhdr->signature) == HFSPLUS_VOLHEAD_SIG) {
188 memcpy(vhdr, HFSPLUS_SB(sb).s_vhdr, sizeof(*vhdr));
189 mark_buffer_dirty(bh);
192 printk(KERN_WARNING "hfs: backup not found!\n");
195 HFSPLUS_SB(sb).flags &= ~HFSPLUS_SB_WRITEBACKUP;
201 static void hfsplus_put_super(struct super_block *sb)
203 dprint(DBG_SUPER, "hfsplus_put_super\n");
210 hfsplus_write_super(sb);
211 if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) {
212 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
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 sync_dirty_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);
226 if (HFSPLUS_SB(sb).nls)
227 unload_nls(HFSPLUS_SB(sb).nls);
228 kfree(sb->s_fs_info);
229 sb->s_fs_info = NULL;
234 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
236 struct super_block *sb = dentry->d_sb;
237 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
239 buf->f_type = HFSPLUS_SUPER_MAGIC;
240 buf->f_bsize = sb->s_blocksize;
241 buf->f_blocks = HFSPLUS_SB(sb).total_blocks << HFSPLUS_SB(sb).fs_shift;
242 buf->f_bfree = HFSPLUS_SB(sb).free_blocks << HFSPLUS_SB(sb).fs_shift;
243 buf->f_bavail = buf->f_bfree;
244 buf->f_files = 0xFFFFFFFF;
245 buf->f_ffree = 0xFFFFFFFF - HFSPLUS_SB(sb).next_cnid;
246 buf->f_fsid.val[0] = (u32)id;
247 buf->f_fsid.val[1] = (u32)(id >> 32);
248 buf->f_namelen = HFSPLUS_MAX_STRLEN;
253 static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
255 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
257 if (!(*flags & MS_RDONLY)) {
258 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb).s_vhdr;
259 struct hfsplus_sb_info sbi;
261 memset(&sbi, 0, sizeof(struct hfsplus_sb_info));
262 sbi.nls = HFSPLUS_SB(sb).nls;
263 if (!hfsplus_parse_options(data, &sbi))
266 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
267 printk(KERN_WARNING "hfs: filesystem was not cleanly unmounted, "
268 "running fsck.hfsplus is recommended. leaving read-only.\n");
269 sb->s_flags |= MS_RDONLY;
271 } else if (sbi.flags & HFSPLUS_SB_FORCE) {
273 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
274 printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
275 sb->s_flags |= MS_RDONLY;
277 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
278 printk(KERN_WARNING "hfs: filesystem is marked journaled, leaving read-only.\n");
279 sb->s_flags |= MS_RDONLY;
286 static const struct super_operations hfsplus_sops = {
287 .alloc_inode = hfsplus_alloc_inode,
288 .destroy_inode = hfsplus_destroy_inode,
289 .write_inode = hfsplus_write_inode,
290 .clear_inode = hfsplus_clear_inode,
291 .put_super = hfsplus_put_super,
292 .write_super = hfsplus_write_super,
293 .statfs = hfsplus_statfs,
294 .remount_fs = hfsplus_remount,
295 .show_options = hfsplus_show_options,
298 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
300 struct hfsplus_vh *vhdr;
301 struct hfsplus_sb_info *sbi;
302 hfsplus_cat_entry entry;
303 struct hfs_find_data fd;
304 struct inode *root, *inode;
306 struct nls_table *nls = NULL;
309 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
314 INIT_HLIST_HEAD(&sbi->rsrc_inodes);
315 hfsplus_fill_defaults(sbi);
316 if (!hfsplus_parse_options(data, sbi)) {
317 printk(KERN_ERR "hfs: unable to parse mount options\n");
322 /* temporarily use utf8 to correctly find the hidden dir below */
324 sbi->nls = load_nls("utf8");
326 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
331 /* Grab the volume header */
332 if (hfsplus_read_wrapper(sb)) {
334 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
338 vhdr = HFSPLUS_SB(sb).s_vhdr;
340 /* Copy parts of the volume header into the superblock */
341 sb->s_magic = HFSPLUS_VOLHEAD_SIG;
342 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
343 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
344 printk(KERN_ERR "hfs: wrong filesystem version\n");
347 HFSPLUS_SB(sb).total_blocks = be32_to_cpu(vhdr->total_blocks);
348 HFSPLUS_SB(sb).free_blocks = be32_to_cpu(vhdr->free_blocks);
349 HFSPLUS_SB(sb).next_alloc = be32_to_cpu(vhdr->next_alloc);
350 HFSPLUS_SB(sb).next_cnid = be32_to_cpu(vhdr->next_cnid);
351 HFSPLUS_SB(sb).file_count = be32_to_cpu(vhdr->file_count);
352 HFSPLUS_SB(sb).folder_count = be32_to_cpu(vhdr->folder_count);
353 HFSPLUS_SB(sb).data_clump_blocks = be32_to_cpu(vhdr->data_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
354 if (!HFSPLUS_SB(sb).data_clump_blocks)
355 HFSPLUS_SB(sb).data_clump_blocks = 1;
356 HFSPLUS_SB(sb).rsrc_clump_blocks = be32_to_cpu(vhdr->rsrc_clump_sz) >> HFSPLUS_SB(sb).alloc_blksz_shift;
357 if (!HFSPLUS_SB(sb).rsrc_clump_blocks)
358 HFSPLUS_SB(sb).rsrc_clump_blocks = 1;
360 /* Set up operations so we can load metadata */
361 sb->s_op = &hfsplus_sops;
362 sb->s_maxbytes = MAX_LFS_FILESIZE;
364 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
365 printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
366 "running fsck.hfsplus is recommended. mounting read-only.\n");
367 sb->s_flags |= MS_RDONLY;
368 } else if (sbi->flags & HFSPLUS_SB_FORCE) {
370 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
371 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
372 sb->s_flags |= MS_RDONLY;
373 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && !(sb->s_flags & MS_RDONLY)) {
374 printk(KERN_WARNING "hfs: write access to a journaled filesystem is not supported, "
375 "use the force option at your own risk, mounting read-only.\n");
376 sb->s_flags |= MS_RDONLY;
378 sbi->flags &= ~HFSPLUS_SB_FORCE;
380 /* Load metadata objects (B*Trees) */
381 HFSPLUS_SB(sb).ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
382 if (!HFSPLUS_SB(sb).ext_tree) {
383 printk(KERN_ERR "hfs: failed to load extents file\n");
386 HFSPLUS_SB(sb).cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
387 if (!HFSPLUS_SB(sb).cat_tree) {
388 printk(KERN_ERR "hfs: failed to load catalog file\n");
392 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
394 printk(KERN_ERR "hfs: failed to load allocation file\n");
395 err = PTR_ERR(inode);
398 HFSPLUS_SB(sb).alloc_file = inode;
400 /* Load the root directory */
401 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
403 printk(KERN_ERR "hfs: failed to load root directory\n");
407 sb->s_root = d_alloc_root(root);
413 sb->s_root->d_op = &hfsplus_dentry_operations;
415 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
416 str.name = HFSP_HIDDENDIR_NAME;
417 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
418 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
419 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
421 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
423 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
425 err = PTR_ERR(inode);
428 HFSPLUS_SB(sb).hidden_dir = inode;
432 if (sb->s_flags & MS_RDONLY)
435 /* H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
436 * all three are registered with Apple for our use
438 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
439 vhdr->modify_date = hfsp_now2mt();
440 be32_add_cpu(&vhdr->write_count, 1);
441 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
442 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
443 mark_buffer_dirty(HFSPLUS_SB(sb).s_vhbh);
444 sync_dirty_buffer(HFSPLUS_SB(sb).s_vhbh);
446 if (!HFSPLUS_SB(sb).hidden_dir) {
447 printk(KERN_DEBUG "hfs: create hidden dir...\n");
448 HFSPLUS_SB(sb).hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
449 hfsplus_create_cat(HFSPLUS_SB(sb).hidden_dir->i_ino, sb->s_root->d_inode,
450 &str, HFSPLUS_SB(sb).hidden_dir);
451 mark_inode_dirty(HFSPLUS_SB(sb).hidden_dir);
454 unload_nls(sbi->nls);
459 hfsplus_put_super(sb);
465 MODULE_AUTHOR("Brad Boyer");
466 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
467 MODULE_LICENSE("GPL");
469 static struct kmem_cache *hfsplus_inode_cachep;
471 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
473 struct hfsplus_inode_info *i;
475 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
476 return i ? &i->vfs_inode : NULL;
479 static void hfsplus_destroy_inode(struct inode *inode)
481 kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
484 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)
486 static int hfsplus_get_sb(struct file_system_type *fs_type,
487 int flags, const char *dev_name, void *data,
488 struct vfsmount *mnt)
490 return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
494 static struct file_system_type hfsplus_fs_type = {
495 .owner = THIS_MODULE,
497 .get_sb = hfsplus_get_sb,
498 .kill_sb = kill_block_super,
499 .fs_flags = FS_REQUIRES_DEV,
502 static void hfsplus_init_once(void *p)
504 struct hfsplus_inode_info *i = p;
506 inode_init_once(&i->vfs_inode);
509 static int __init init_hfsplus_fs(void)
513 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
514 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
516 if (!hfsplus_inode_cachep)
518 err = register_filesystem(&hfsplus_fs_type);
520 kmem_cache_destroy(hfsplus_inode_cachep);
524 static void __exit exit_hfsplus_fs(void)
526 unregister_filesystem(&hfsplus_fs_type);
527 kmem_cache_destroy(hfsplus_inode_cachep);
530 module_init(init_hfsplus_fs)
531 module_exit(exit_hfsplus_fs)