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/mpage.h>
16 #include <linux/sched.h>
17 #include <linux/aio.h>
22 static const struct file_operations hfs_file_operations;
23 static const struct inode_operations hfs_file_inode_operations;
25 /*================ Variable-like macros ================*/
27 #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO)
29 static int hfs_writepage(struct page *page, struct writeback_control *wbc)
31 return block_write_full_page(page, hfs_get_block, wbc);
34 static int hfs_readpage(struct file *file, struct page *page)
36 return block_read_full_page(page, hfs_get_block);
39 static void hfs_write_failed(struct address_space *mapping, loff_t to)
41 struct inode *inode = mapping->host;
43 if (to > inode->i_size) {
44 truncate_pagecache(inode, inode->i_size);
45 hfs_file_truncate(inode);
49 static int hfs_write_begin(struct file *file, struct address_space *mapping,
50 loff_t pos, unsigned len, unsigned flags,
51 struct page **pagep, void **fsdata)
56 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
58 &HFS_I(mapping->host)->phys_size);
60 hfs_write_failed(mapping, pos + len);
65 static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
67 return generic_block_bmap(mapping, block, hfs_get_block);
70 static int hfs_releasepage(struct page *page, gfp_t mask)
72 struct inode *inode = page->mapping->host;
73 struct super_block *sb = inode->i_sb;
74 struct hfs_btree *tree;
75 struct hfs_bnode *node;
79 switch (inode->i_ino) {
81 tree = HFS_SB(sb)->ext_tree;
84 tree = HFS_SB(sb)->cat_tree;
94 if (tree->node_size >= PAGE_CACHE_SIZE) {
95 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
96 spin_lock(&tree->hash_lock);
97 node = hfs_bnode_findhash(tree, nidx);
100 else if (atomic_read(&node->refcnt))
103 hfs_bnode_unhash(node);
104 hfs_bnode_free(node);
106 spin_unlock(&tree->hash_lock);
108 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
109 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
110 spin_lock(&tree->hash_lock);
112 node = hfs_bnode_findhash(tree, nidx++);
115 if (atomic_read(&node->refcnt)) {
119 hfs_bnode_unhash(node);
120 hfs_bnode_free(node);
121 } while (--i && nidx < tree->node_count);
122 spin_unlock(&tree->hash_lock);
124 return res ? try_to_free_buffers(page) : 0;
127 static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb,
128 struct iov_iter *iter, loff_t offset)
130 struct file *file = iocb->ki_filp;
131 struct address_space *mapping = file->f_mapping;
132 struct inode *inode = file_inode(file)->i_mapping->host;
135 ret = blockdev_direct_IO(rw, iocb, inode, iter, offset, hfs_get_block);
138 * In case of error extending write may have instantiated a few
139 * blocks outside i_size. Trim these off again.
141 if (unlikely((rw & WRITE) && ret < 0)) {
142 loff_t isize = i_size_read(inode);
143 loff_t end = offset + iov_iter_count(iter);
146 hfs_write_failed(mapping, end);
152 static int hfs_writepages(struct address_space *mapping,
153 struct writeback_control *wbc)
155 return mpage_writepages(mapping, wbc, hfs_get_block);
158 const struct address_space_operations hfs_btree_aops = {
159 .readpage = hfs_readpage,
160 .writepage = hfs_writepage,
161 .write_begin = hfs_write_begin,
162 .write_end = generic_write_end,
164 .releasepage = hfs_releasepage,
167 const struct address_space_operations hfs_aops = {
168 .readpage = hfs_readpage,
169 .writepage = hfs_writepage,
170 .write_begin = hfs_write_begin,
171 .write_end = generic_write_end,
173 .direct_IO = hfs_direct_IO,
174 .writepages = hfs_writepages,
180 struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, umode_t mode)
182 struct super_block *sb = dir->i_sb;
183 struct inode *inode = new_inode(sb);
187 mutex_init(&HFS_I(inode)->extents_lock);
188 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
189 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
190 inode->i_ino = HFS_SB(sb)->next_id++;
191 inode->i_mode = mode;
192 inode->i_uid = current_fsuid();
193 inode->i_gid = current_fsgid();
195 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
196 HFS_I(inode)->flags = 0;
197 HFS_I(inode)->rsrc_inode = NULL;
198 HFS_I(inode)->fs_blocks = 0;
201 HFS_SB(sb)->folder_count++;
202 if (dir->i_ino == HFS_ROOT_CNID)
203 HFS_SB(sb)->root_dirs++;
204 inode->i_op = &hfs_dir_inode_operations;
205 inode->i_fop = &hfs_dir_operations;
206 inode->i_mode |= S_IRWXUGO;
207 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
208 } else if (S_ISREG(mode)) {
209 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
210 HFS_SB(sb)->file_count++;
211 if (dir->i_ino == HFS_ROOT_CNID)
212 HFS_SB(sb)->root_files++;
213 inode->i_op = &hfs_file_inode_operations;
214 inode->i_fop = &hfs_file_operations;
215 inode->i_mapping->a_ops = &hfs_aops;
216 inode->i_mode |= S_IRUGO|S_IXUGO;
218 inode->i_mode |= S_IWUGO;
219 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
220 HFS_I(inode)->phys_size = 0;
221 HFS_I(inode)->alloc_blocks = 0;
222 HFS_I(inode)->first_blocks = 0;
223 HFS_I(inode)->cached_start = 0;
224 HFS_I(inode)->cached_blocks = 0;
225 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
226 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
228 insert_inode_hash(inode);
229 mark_inode_dirty(inode);
230 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
231 hfs_mark_mdb_dirty(sb);
236 void hfs_delete_inode(struct inode *inode)
238 struct super_block *sb = inode->i_sb;
240 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
241 if (S_ISDIR(inode->i_mode)) {
242 HFS_SB(sb)->folder_count--;
243 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
244 HFS_SB(sb)->root_dirs--;
245 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
246 hfs_mark_mdb_dirty(sb);
249 HFS_SB(sb)->file_count--;
250 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
251 HFS_SB(sb)->root_files--;
252 if (S_ISREG(inode->i_mode)) {
253 if (!inode->i_nlink) {
255 hfs_file_truncate(inode);
258 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
259 hfs_mark_mdb_dirty(sb);
262 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
263 __be32 __log_size, __be32 phys_size, u32 clump_size)
265 struct super_block *sb = inode->i_sb;
266 u32 log_size = be32_to_cpu(__log_size);
270 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
271 for (count = 0, i = 0; i < 3; i++)
272 count += be16_to_cpu(ext[i].count);
273 HFS_I(inode)->first_blocks = count;
275 inode->i_size = HFS_I(inode)->phys_size = log_size;
276 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
277 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
278 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
279 HFS_SB(sb)->alloc_blksz;
280 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
281 if (!HFS_I(inode)->clump_blocks)
282 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
285 struct hfs_iget_data {
286 struct hfs_cat_key *key;
290 static int hfs_test_inode(struct inode *inode, void *data)
292 struct hfs_iget_data *idata = data;
298 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
300 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
310 static int hfs_read_inode(struct inode *inode, void *data)
312 struct hfs_iget_data *idata = data;
313 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
316 HFS_I(inode)->flags = 0;
317 HFS_I(inode)->rsrc_inode = NULL;
318 mutex_init(&HFS_I(inode)->extents_lock);
319 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
321 /* Initialize the inode */
322 inode->i_uid = hsb->s_uid;
323 inode->i_gid = hsb->s_gid;
327 HFS_I(inode)->cat_key = *idata->key;
329 HFS_I(inode)->flags |= HFS_FLG_RSRC;
330 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
335 if (!HFS_IS_RSRC(inode)) {
336 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
337 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
339 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
340 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
343 inode->i_ino = be32_to_cpu(rec->file.FlNum);
344 inode->i_mode = S_IRUGO | S_IXUGO;
345 if (!(rec->file.Flags & HFS_FIL_LOCK))
346 inode->i_mode |= S_IWUGO;
347 inode->i_mode &= ~hsb->s_file_umask;
348 inode->i_mode |= S_IFREG;
349 inode->i_ctime = inode->i_atime = inode->i_mtime =
350 hfs_m_to_utime(rec->file.MdDat);
351 inode->i_op = &hfs_file_inode_operations;
352 inode->i_fop = &hfs_file_operations;
353 inode->i_mapping->a_ops = &hfs_aops;
356 inode->i_ino = be32_to_cpu(rec->dir.DirID);
357 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
358 HFS_I(inode)->fs_blocks = 0;
359 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
360 inode->i_ctime = inode->i_atime = inode->i_mtime =
361 hfs_m_to_utime(rec->dir.MdDat);
362 inode->i_op = &hfs_dir_inode_operations;
363 inode->i_fop = &hfs_dir_operations;
366 make_bad_inode(inode);
374 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
375 * the catalog B-tree and the 'type' of the desired file return the
376 * inode for that file/directory or NULL. Note that 'type' indicates
377 * whether we want the actual file or directory, or the corresponding
378 * metadata (AppleDouble header file or CAP metadata file).
380 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
382 struct hfs_iget_data data = { key, rec };
388 cnid = be32_to_cpu(rec->dir.DirID);
391 cnid = be32_to_cpu(rec->file.FlNum);
396 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
397 if (inode && (inode->i_state & I_NEW))
398 unlock_new_inode(inode);
402 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
403 __be32 *log_size, __be32 *phys_size)
405 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
408 *log_size = cpu_to_be32(inode->i_size);
410 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
411 HFS_SB(inode->i_sb)->alloc_blksz);
414 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
416 struct inode *main_inode = inode;
417 struct hfs_find_data fd;
421 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
422 res = hfs_ext_write_extent(inode);
426 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
427 switch (inode->i_ino) {
431 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
434 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
442 if (HFS_IS_RSRC(inode))
443 main_inode = HFS_I(inode)->rsrc_inode;
445 if (!main_inode->i_nlink)
448 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
452 fd.search_key->cat = HFS_I(main_inode)->cat_key;
453 if (hfs_brec_find(&fd))
457 if (S_ISDIR(main_inode->i_mode)) {
458 if (fd.entrylength < sizeof(struct hfs_cat_dir))
460 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
461 sizeof(struct hfs_cat_dir));
462 if (rec.type != HFS_CDR_DIR ||
463 be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
466 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
467 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
469 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
470 sizeof(struct hfs_cat_dir));
471 } else if (HFS_IS_RSRC(inode)) {
472 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
473 sizeof(struct hfs_cat_file));
474 hfs_inode_write_fork(inode, rec.file.RExtRec,
475 &rec.file.RLgLen, &rec.file.RPyLen);
476 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
477 sizeof(struct hfs_cat_file));
479 if (fd.entrylength < sizeof(struct hfs_cat_file))
481 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
482 sizeof(struct hfs_cat_file));
483 if (rec.type != HFS_CDR_FIL ||
484 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
487 if (inode->i_mode & S_IWUSR)
488 rec.file.Flags &= ~HFS_FIL_LOCK;
490 rec.file.Flags |= HFS_FIL_LOCK;
491 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
492 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
494 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
495 sizeof(struct hfs_cat_file));
502 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
505 struct inode *inode = NULL;
507 struct hfs_find_data fd;
510 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
513 inode = HFS_I(dir)->rsrc_inode;
517 inode = new_inode(dir->i_sb);
519 return ERR_PTR(-ENOMEM);
521 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
526 fd.search_key->cat = HFS_I(dir)->cat_key;
527 res = hfs_brec_read(&fd, &rec, sizeof(rec));
529 struct hfs_iget_data idata = { NULL, &rec };
530 hfs_read_inode(inode, &idata);
537 HFS_I(inode)->rsrc_inode = dir;
538 HFS_I(dir)->rsrc_inode = inode;
540 hlist_add_fake(&inode->i_hash);
541 mark_inode_dirty(inode);
543 d_add(dentry, inode);
547 void hfs_evict_inode(struct inode *inode)
549 truncate_inode_pages(&inode->i_data, 0);
551 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
552 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
553 iput(HFS_I(inode)->rsrc_inode);
557 static int hfs_file_open(struct inode *inode, struct file *file)
559 if (HFS_IS_RSRC(inode))
560 inode = HFS_I(inode)->rsrc_inode;
561 atomic_inc(&HFS_I(inode)->opencnt);
565 static int hfs_file_release(struct inode *inode, struct file *file)
567 //struct super_block *sb = inode->i_sb;
569 if (HFS_IS_RSRC(inode))
570 inode = HFS_I(inode)->rsrc_inode;
571 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
572 mutex_lock(&inode->i_mutex);
573 hfs_file_truncate(inode);
574 //if (inode->i_flags & S_DEAD) {
575 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
576 // hfs_delete_inode(inode);
578 mutex_unlock(&inode->i_mutex);
584 * hfs_notify_change()
586 * Based very closely on fs/msdos/inode.c by Werner Almesberger
588 * This is the notify_change() field in the super_operations structure
589 * for HFS file systems. The purpose is to take that changes made to
590 * an inode and apply then in a filesystem-dependent manner. In this
591 * case the process has a few of tasks to do:
592 * 1) prevent changes to the i_uid and i_gid fields.
593 * 2) map file permissions to the closest allowable permissions
594 * 3) Since multiple Linux files can share the same on-disk inode under
595 * HFS (for instance the data and resource forks of a file) a change
596 * to permissions must be applied to all other in-core inodes which
597 * correspond to the same HFS file.
600 int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
602 struct inode *inode = dentry->d_inode;
603 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
606 error = inode_change_ok(inode, attr); /* basic permission checks */
610 /* no uig/gid changes and limit which mode bits can be set */
611 if (((attr->ia_valid & ATTR_UID) &&
612 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
613 ((attr->ia_valid & ATTR_GID) &&
614 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
615 ((attr->ia_valid & ATTR_MODE) &&
616 ((S_ISDIR(inode->i_mode) &&
617 (attr->ia_mode != inode->i_mode)) ||
618 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
619 return hsb->s_quiet ? 0 : error;
622 if (attr->ia_valid & ATTR_MODE) {
623 /* Only the 'w' bits can ever change and only all together. */
624 if (attr->ia_mode & S_IWUSR)
625 attr->ia_mode = inode->i_mode | S_IWUGO;
627 attr->ia_mode = inode->i_mode & ~S_IWUGO;
628 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
631 if ((attr->ia_valid & ATTR_SIZE) &&
632 attr->ia_size != i_size_read(inode)) {
633 inode_dio_wait(inode);
635 error = inode_newsize_ok(inode, attr->ia_size);
639 truncate_setsize(inode, attr->ia_size);
640 hfs_file_truncate(inode);
643 setattr_copy(inode, attr);
644 mark_inode_dirty(inode);
648 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
651 struct inode *inode = filp->f_mapping->host;
652 struct super_block * sb;
655 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
658 mutex_lock(&inode->i_mutex);
660 /* sync the inode to buffers */
661 ret = write_inode_now(inode, 0);
663 /* sync the superblock to buffers */
665 flush_delayed_work(&HFS_SB(sb)->mdb_work);
666 /* .. finally sync the buffers to disk */
667 err = sync_blockdev(sb->s_bdev);
670 mutex_unlock(&inode->i_mutex);
674 static const struct file_operations hfs_file_operations = {
675 .llseek = generic_file_llseek,
676 .read = do_sync_read,
677 .read_iter = generic_file_read_iter,
678 .write = do_sync_write,
679 .write_iter = generic_file_write_iter,
680 .mmap = generic_file_mmap,
681 .splice_read = generic_file_splice_read,
682 .fsync = hfs_file_fsync,
683 .open = hfs_file_open,
684 .release = hfs_file_release,
687 static const struct inode_operations hfs_file_inode_operations = {
688 .lookup = hfs_file_lookup,
689 .setattr = hfs_inode_setattr,
690 .setxattr = hfs_setxattr,
691 .getxattr = hfs_getxattr,
692 .listxattr = hfs_listxattr,