4 * Copyright (C) 1995-1997 Paul H. Hargrove
5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
6 * This file may be distributed under the terms of the GNU General Public License.
8 * This file contains inode-related functions which do not depend on
9 * which scheme is being used to represent forks.
11 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
14 #include <linux/pagemap.h>
15 #include <linux/version.h>
16 #include <linux/mpage.h>
21 /*================ Variable-like macros ================*/
23 #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO)
25 static int hfs_writepage(struct page *page, struct writeback_control *wbc)
27 return block_write_full_page(page, hfs_get_block, wbc);
30 static int hfs_readpage(struct file *file, struct page *page)
32 return block_read_full_page(page, hfs_get_block);
35 static int hfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
37 return cont_prepare_write(page, from, to, hfs_get_block,
38 &HFS_I(page->mapping->host)->phys_size);
41 static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
43 return generic_block_bmap(mapping, block, hfs_get_block);
46 int hfs_releasepage(struct page *page, int mask)
48 struct inode *inode = page->mapping->host;
49 struct super_block *sb = inode->i_sb;
50 struct hfs_btree *tree;
51 struct hfs_bnode *node;
55 switch (inode->i_ino) {
57 tree = HFS_SB(sb)->ext_tree;
60 tree = HFS_SB(sb)->cat_tree;
66 if (tree->node_size >= PAGE_CACHE_SIZE) {
67 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
68 spin_lock(&tree->hash_lock);
69 node = hfs_bnode_findhash(tree, nidx);
72 else if (atomic_read(&node->refcnt))
74 else for (i = 0; i < tree->pages_per_bnode; i++) {
75 if (PageActive(node->page[i])) {
81 hfs_bnode_unhash(node);
84 spin_unlock(&tree->hash_lock);
86 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
87 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
88 spin_lock(&tree->hash_lock);
90 node = hfs_bnode_findhash(tree, nidx++);
93 if (atomic_read(&node->refcnt)) {
97 hfs_bnode_unhash(node);
99 } while (--i && nidx < tree->node_count);
100 spin_unlock(&tree->hash_lock);
102 //printk("releasepage: %lu,%x = %d\n", page->index, mask, res);
106 static int hfs_get_blocks(struct inode *inode, sector_t iblock, unsigned long max_blocks,
107 struct buffer_head *bh_result, int create)
111 ret = hfs_get_block(inode, iblock, bh_result, create);
113 bh_result->b_size = (1 << inode->i_blkbits);
117 static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb,
118 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
120 struct file *file = iocb->ki_filp;
121 struct inode *inode = file->f_dentry->d_inode->i_mapping->host;
123 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
124 offset, nr_segs, hfs_get_blocks, NULL);
127 static int hfs_writepages(struct address_space *mapping,
128 struct writeback_control *wbc)
130 return mpage_writepages(mapping, wbc, hfs_get_block);
133 struct address_space_operations hfs_btree_aops = {
134 .readpage = hfs_readpage,
135 .writepage = hfs_writepage,
136 .sync_page = block_sync_page,
137 .prepare_write = hfs_prepare_write,
138 .commit_write = generic_commit_write,
140 .releasepage = hfs_releasepage,
143 struct address_space_operations hfs_aops = {
144 .readpage = hfs_readpage,
145 .writepage = hfs_writepage,
146 .sync_page = block_sync_page,
147 .prepare_write = hfs_prepare_write,
148 .commit_write = generic_commit_write,
150 .direct_IO = hfs_direct_IO,
151 .writepages = hfs_writepages,
157 struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, int mode)
159 struct super_block *sb = dir->i_sb;
160 struct inode *inode = new_inode(sb);
164 init_MUTEX(&HFS_I(inode)->extents_lock);
165 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
166 hfs_cat_build_key((btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
167 inode->i_ino = HFS_SB(sb)->next_id++;
168 inode->i_mode = mode;
169 inode->i_uid = current->fsuid;
170 inode->i_gid = current->fsgid;
172 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
173 inode->i_blksize = HFS_SB(sb)->alloc_blksz;
174 HFS_I(inode)->flags = 0;
175 HFS_I(inode)->rsrc_inode = NULL;
176 HFS_I(inode)->fs_blocks = 0;
177 if (S_ISDIR(inode->i_mode)) {
179 HFS_SB(sb)->folder_count++;
180 if (dir->i_ino == HFS_ROOT_CNID)
181 HFS_SB(sb)->root_dirs++;
182 inode->i_op = &hfs_dir_inode_operations;
183 inode->i_fop = &hfs_dir_operations;
184 } else if (S_ISREG(inode->i_mode)) {
185 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
186 HFS_SB(sb)->file_count++;
187 if (dir->i_ino == HFS_ROOT_CNID)
188 HFS_SB(sb)->root_files++;
189 inode->i_op = &hfs_file_inode_operations;
190 inode->i_fop = &hfs_file_operations;
191 inode->i_mapping->a_ops = &hfs_aops;
192 HFS_I(inode)->phys_size = 0;
193 HFS_I(inode)->alloc_blocks = 0;
194 HFS_I(inode)->first_blocks = 0;
195 HFS_I(inode)->cached_start = 0;
196 HFS_I(inode)->cached_blocks = 0;
197 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
198 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
200 insert_inode_hash(inode);
201 mark_inode_dirty(inode);
202 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
208 void hfs_delete_inode(struct inode *inode)
210 struct super_block *sb = inode->i_sb;
212 dprint(DBG_INODE, "delete_inode: %lu\n", inode->i_ino);
213 if (S_ISDIR(inode->i_mode)) {
214 HFS_SB(sb)->folder_count--;
215 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
216 HFS_SB(sb)->root_dirs--;
217 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
221 HFS_SB(sb)->file_count--;
222 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
223 HFS_SB(sb)->root_files--;
224 if (S_ISREG(inode->i_mode)) {
225 if (!inode->i_nlink) {
227 hfs_file_truncate(inode);
230 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
234 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
235 __be32 __log_size, __be32 phys_size, u32 clump_size)
237 struct super_block *sb = inode->i_sb;
238 u32 log_size = be32_to_cpu(__log_size);
242 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
243 for (count = 0, i = 0; i < 3; i++)
244 count += be16_to_cpu(ext[i].count);
245 HFS_I(inode)->first_blocks = count;
247 inode->i_size = HFS_I(inode)->phys_size = log_size;
248 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
249 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
250 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
251 HFS_SB(sb)->alloc_blksz;
252 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
253 if (!HFS_I(inode)->clump_blocks)
254 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
257 struct hfs_iget_data {
258 struct hfs_cat_key *key;
262 int hfs_test_inode(struct inode *inode, void *data)
264 struct hfs_iget_data *idata = data;
270 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
272 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
282 int hfs_read_inode(struct inode *inode, void *data)
284 struct hfs_iget_data *idata = data;
285 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
288 HFS_I(inode)->flags = 0;
289 HFS_I(inode)->rsrc_inode = NULL;
290 init_MUTEX(&HFS_I(inode)->extents_lock);
291 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
293 /* Initialize the inode */
294 inode->i_uid = hsb->s_uid;
295 inode->i_gid = hsb->s_gid;
297 inode->i_blksize = HFS_SB(inode->i_sb)->alloc_blksz;
300 HFS_I(inode)->cat_key = *idata->key;
302 HFS_I(inode)->flags |= HFS_FLG_RSRC;
303 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
308 if (!HFS_IS_RSRC(inode)) {
309 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
310 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
312 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
313 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
316 inode->i_ino = be32_to_cpu(rec->file.FlNum);
317 inode->i_mode = S_IRUGO | S_IXUGO;
318 if (!(rec->file.Flags & HFS_FIL_LOCK))
319 inode->i_mode |= S_IWUGO;
320 inode->i_mode &= hsb->s_file_umask;
321 inode->i_mode |= S_IFREG;
322 inode->i_ctime = inode->i_atime = inode->i_mtime =
323 hfs_m_to_utime(rec->file.MdDat);
324 inode->i_op = &hfs_file_inode_operations;
325 inode->i_fop = &hfs_file_operations;
326 inode->i_mapping->a_ops = &hfs_aops;
329 inode->i_ino = be32_to_cpu(rec->dir.DirID);
330 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
331 HFS_I(inode)->fs_blocks = 0;
332 inode->i_mode = S_IFDIR | (S_IRWXUGO & hsb->s_dir_umask);
333 inode->i_ctime = inode->i_atime = inode->i_mtime =
334 hfs_m_to_utime(rec->dir.MdDat);
335 inode->i_op = &hfs_dir_inode_operations;
336 inode->i_fop = &hfs_dir_operations;
339 make_bad_inode(inode);
347 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
348 * the catalog B-tree and the 'type' of the desired file return the
349 * inode for that file/directory or NULL. Note that 'type' indicates
350 * whether we want the actual file or directory, or the corresponding
351 * metadata (AppleDouble header file or CAP metadata file).
353 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
355 struct hfs_iget_data data = { key, rec };
361 cnid = be32_to_cpu(rec->dir.DirID);
364 cnid = be32_to_cpu(rec->file.FlNum);
369 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
370 if (inode && (inode->i_state & I_NEW))
371 unlock_new_inode(inode);
375 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
376 __be32 *log_size, __be32 *phys_size)
378 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
381 *log_size = cpu_to_be32(inode->i_size);
383 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
384 HFS_SB(inode->i_sb)->alloc_blksz);
387 int hfs_write_inode(struct inode *inode, int unused)
389 struct inode *main_inode = inode;
390 struct hfs_find_data fd;
393 dprint(DBG_INODE, "hfs_write_inode: %lu\n", inode->i_ino);
394 hfs_ext_write_extent(inode);
396 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
397 switch (inode->i_ino) {
401 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
404 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
412 if (HFS_IS_RSRC(inode))
413 main_inode = HFS_I(inode)->rsrc_inode;
415 if (!main_inode->i_nlink)
418 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
422 fd.search_key->cat = HFS_I(main_inode)->cat_key;
423 if (hfs_brec_find(&fd))
427 if (S_ISDIR(main_inode->i_mode)) {
428 if (fd.entrylength < sizeof(struct hfs_cat_dir))
430 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
431 sizeof(struct hfs_cat_dir));
432 if (rec.type != HFS_CDR_DIR ||
433 be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
436 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
437 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
439 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
440 sizeof(struct hfs_cat_dir));
441 } else if (HFS_IS_RSRC(inode)) {
442 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
443 sizeof(struct hfs_cat_file));
444 hfs_inode_write_fork(inode, rec.file.RExtRec,
445 &rec.file.RLgLen, &rec.file.RPyLen);
446 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
447 sizeof(struct hfs_cat_file));
449 if (fd.entrylength < sizeof(struct hfs_cat_file))
451 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
452 sizeof(struct hfs_cat_file));
453 if (rec.type != HFS_CDR_FIL ||
454 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
457 if (inode->i_mode & S_IWUSR)
458 rec.file.Flags &= ~HFS_FIL_LOCK;
460 rec.file.Flags |= HFS_FIL_LOCK;
461 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
462 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
464 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
465 sizeof(struct hfs_cat_file));
472 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
473 struct nameidata *nd)
475 struct inode *inode = NULL;
477 struct hfs_find_data fd;
480 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
483 inode = HFS_I(dir)->rsrc_inode;
487 inode = new_inode(dir->i_sb);
489 return ERR_PTR(-ENOMEM);
491 hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
492 fd.search_key->cat = HFS_I(dir)->cat_key;
493 res = hfs_brec_read(&fd, &rec, sizeof(rec));
495 struct hfs_iget_data idata = { NULL, &rec };
496 hfs_read_inode(inode, &idata);
503 HFS_I(inode)->rsrc_inode = dir;
504 HFS_I(dir)->rsrc_inode = inode;
506 hlist_add_head(&inode->i_hash, &HFS_SB(dir->i_sb)->rsrc_inodes);
507 mark_inode_dirty(inode);
509 d_add(dentry, inode);
513 void hfs_clear_inode(struct inode *inode)
515 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
516 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
517 iput(HFS_I(inode)->rsrc_inode);
521 static int hfs_permission(struct inode *inode, int mask,
522 struct nameidata *nd)
524 if (S_ISREG(inode->i_mode) && mask & MAY_EXEC)
526 return generic_permission(inode, mask, NULL);
529 static int hfs_file_open(struct inode *inode, struct file *file)
531 if (HFS_IS_RSRC(inode))
532 inode = HFS_I(inode)->rsrc_inode;
533 if (atomic_read(&file->f_count) != 1)
535 atomic_inc(&HFS_I(inode)->opencnt);
539 static int hfs_file_release(struct inode *inode, struct file *file)
541 //struct super_block *sb = inode->i_sb;
543 if (HFS_IS_RSRC(inode))
544 inode = HFS_I(inode)->rsrc_inode;
545 if (atomic_read(&file->f_count) != 0)
547 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
549 hfs_file_truncate(inode);
550 //if (inode->i_flags & S_DEAD) {
551 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
552 // hfs_delete_inode(inode);
560 * hfs_notify_change()
562 * Based very closely on fs/msdos/inode.c by Werner Almesberger
564 * This is the notify_change() field in the super_operations structure
565 * for HFS file systems. The purpose is to take that changes made to
566 * an inode and apply then in a filesystem-dependent manner. In this
567 * case the process has a few of tasks to do:
568 * 1) prevent changes to the i_uid and i_gid fields.
569 * 2) map file permissions to the closest allowable permissions
570 * 3) Since multiple Linux files can share the same on-disk inode under
571 * HFS (for instance the data and resource forks of a file) a change
572 * to permissions must be applied to all other in-core inodes which
573 * correspond to the same HFS file.
576 int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
578 struct inode *inode = dentry->d_inode;
579 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
582 error = inode_change_ok(inode, attr); /* basic permission checks */
586 /* no uig/gid changes and limit which mode bits can be set */
587 if (((attr->ia_valid & ATTR_UID) &&
588 (attr->ia_uid != hsb->s_uid)) ||
589 ((attr->ia_valid & ATTR_GID) &&
590 (attr->ia_gid != hsb->s_gid)) ||
591 ((attr->ia_valid & ATTR_MODE) &&
592 ((S_ISDIR(inode->i_mode) &&
593 (attr->ia_mode != inode->i_mode)) ||
594 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
595 return hsb->s_quiet ? 0 : error;
598 if (attr->ia_valid & ATTR_MODE) {
599 /* Only the 'w' bits can ever change and only all together. */
600 if (attr->ia_mode & S_IWUSR)
601 attr->ia_mode = inode->i_mode | S_IWUGO;
603 attr->ia_mode = inode->i_mode & ~S_IWUGO;
604 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
606 error = inode_setattr(inode, attr);
614 struct file_operations hfs_file_operations = {
615 .llseek = generic_file_llseek,
616 .read = generic_file_read,
617 .write = generic_file_write,
618 .mmap = generic_file_mmap,
619 .sendfile = generic_file_sendfile,
621 .open = hfs_file_open,
622 .release = hfs_file_release,
625 struct inode_operations hfs_file_inode_operations = {
626 .lookup = hfs_file_lookup,
627 .truncate = hfs_file_truncate,
628 .setattr = hfs_inode_setattr,
629 .permission = hfs_permission,
630 .setxattr = hfs_setxattr,
631 .getxattr = hfs_getxattr,
632 .listxattr = hfs_listxattr,