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/cred.h>
18 #include <linux/uio.h>
19 #include <linux/xattr.h>
20 #include <linux/blkdev.h>
25 static const struct file_operations hfs_file_operations;
26 static const struct inode_operations hfs_file_inode_operations;
28 /*================ Variable-like macros ================*/
30 #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO)
32 static int hfs_writepage(struct page *page, struct writeback_control *wbc)
34 return block_write_full_page(page, hfs_get_block, wbc);
37 static int hfs_readpage(struct file *file, struct page *page)
39 return block_read_full_page(page, hfs_get_block);
42 static void hfs_write_failed(struct address_space *mapping, loff_t to)
44 struct inode *inode = mapping->host;
46 if (to > inode->i_size) {
47 truncate_pagecache(inode, inode->i_size);
48 hfs_file_truncate(inode);
52 static int hfs_write_begin(struct file *file, struct address_space *mapping,
53 loff_t pos, unsigned len, unsigned flags,
54 struct page **pagep, void **fsdata)
59 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
61 &HFS_I(mapping->host)->phys_size);
63 hfs_write_failed(mapping, pos + len);
68 static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
70 return generic_block_bmap(mapping, block, hfs_get_block);
73 static int hfs_releasepage(struct page *page, gfp_t mask)
75 struct inode *inode = page->mapping->host;
76 struct super_block *sb = inode->i_sb;
77 struct hfs_btree *tree;
78 struct hfs_bnode *node;
82 switch (inode->i_ino) {
84 tree = HFS_SB(sb)->ext_tree;
87 tree = HFS_SB(sb)->cat_tree;
97 if (tree->node_size >= PAGE_SIZE) {
98 nidx = page->index >> (tree->node_size_shift - PAGE_SHIFT);
99 spin_lock(&tree->hash_lock);
100 node = hfs_bnode_findhash(tree, nidx);
103 else if (atomic_read(&node->refcnt))
106 hfs_bnode_unhash(node);
107 hfs_bnode_free(node);
109 spin_unlock(&tree->hash_lock);
111 nidx = page->index << (PAGE_SHIFT - tree->node_size_shift);
112 i = 1 << (PAGE_SHIFT - tree->node_size_shift);
113 spin_lock(&tree->hash_lock);
115 node = hfs_bnode_findhash(tree, nidx++);
118 if (atomic_read(&node->refcnt)) {
122 hfs_bnode_unhash(node);
123 hfs_bnode_free(node);
124 } while (--i && nidx < tree->node_count);
125 spin_unlock(&tree->hash_lock);
127 return res ? try_to_free_buffers(page) : 0;
130 static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
132 struct file *file = iocb->ki_filp;
133 struct address_space *mapping = file->f_mapping;
134 struct inode *inode = mapping->host;
135 size_t count = iov_iter_count(iter);
138 ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
141 * In case of error extending write may have instantiated a few
142 * blocks outside i_size. Trim these off again.
144 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
145 loff_t isize = i_size_read(inode);
146 loff_t end = iocb->ki_pos + count;
149 hfs_write_failed(mapping, end);
155 static int hfs_writepages(struct address_space *mapping,
156 struct writeback_control *wbc)
158 return mpage_writepages(mapping, wbc, hfs_get_block);
161 const struct address_space_operations hfs_btree_aops = {
162 .set_page_dirty = __set_page_dirty_buffers,
163 .readpage = hfs_readpage,
164 .writepage = hfs_writepage,
165 .write_begin = hfs_write_begin,
166 .write_end = generic_write_end,
168 .releasepage = hfs_releasepage,
171 const struct address_space_operations hfs_aops = {
172 .set_page_dirty = __set_page_dirty_buffers,
173 .readpage = hfs_readpage,
174 .writepage = hfs_writepage,
175 .write_begin = hfs_write_begin,
176 .write_end = generic_write_end,
178 .direct_IO = hfs_direct_IO,
179 .writepages = hfs_writepages,
185 struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
187 struct super_block *sb = dir->i_sb;
188 struct inode *inode = new_inode(sb);
192 mutex_init(&HFS_I(inode)->extents_lock);
193 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
194 spin_lock_init(&HFS_I(inode)->open_dir_lock);
195 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
196 inode->i_ino = HFS_SB(sb)->next_id++;
197 inode->i_mode = mode;
198 inode->i_uid = current_fsuid();
199 inode->i_gid = current_fsgid();
201 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
202 HFS_I(inode)->flags = 0;
203 HFS_I(inode)->rsrc_inode = NULL;
204 HFS_I(inode)->fs_blocks = 0;
207 HFS_SB(sb)->folder_count++;
208 if (dir->i_ino == HFS_ROOT_CNID)
209 HFS_SB(sb)->root_dirs++;
210 inode->i_op = &hfs_dir_inode_operations;
211 inode->i_fop = &hfs_dir_operations;
212 inode->i_mode |= S_IRWXUGO;
213 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
214 } else if (S_ISREG(mode)) {
215 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
216 HFS_SB(sb)->file_count++;
217 if (dir->i_ino == HFS_ROOT_CNID)
218 HFS_SB(sb)->root_files++;
219 inode->i_op = &hfs_file_inode_operations;
220 inode->i_fop = &hfs_file_operations;
221 inode->i_mapping->a_ops = &hfs_aops;
222 inode->i_mode |= S_IRUGO|S_IXUGO;
224 inode->i_mode |= S_IWUGO;
225 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
226 HFS_I(inode)->phys_size = 0;
227 HFS_I(inode)->alloc_blocks = 0;
228 HFS_I(inode)->first_blocks = 0;
229 HFS_I(inode)->cached_start = 0;
230 HFS_I(inode)->cached_blocks = 0;
231 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
232 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
234 insert_inode_hash(inode);
235 mark_inode_dirty(inode);
236 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
237 hfs_mark_mdb_dirty(sb);
242 void hfs_delete_inode(struct inode *inode)
244 struct super_block *sb = inode->i_sb;
246 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
247 if (S_ISDIR(inode->i_mode)) {
248 HFS_SB(sb)->folder_count--;
249 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
250 HFS_SB(sb)->root_dirs--;
251 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
252 hfs_mark_mdb_dirty(sb);
255 HFS_SB(sb)->file_count--;
256 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
257 HFS_SB(sb)->root_files--;
258 if (S_ISREG(inode->i_mode)) {
259 if (!inode->i_nlink) {
261 hfs_file_truncate(inode);
264 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
265 hfs_mark_mdb_dirty(sb);
268 void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
269 __be32 __log_size, __be32 phys_size, u32 clump_size)
271 struct super_block *sb = inode->i_sb;
272 u32 log_size = be32_to_cpu(__log_size);
276 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
277 for (count = 0, i = 0; i < 3; i++)
278 count += be16_to_cpu(ext[i].count);
279 HFS_I(inode)->first_blocks = count;
281 inode->i_size = HFS_I(inode)->phys_size = log_size;
282 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
283 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
284 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
285 HFS_SB(sb)->alloc_blksz;
286 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
287 if (!HFS_I(inode)->clump_blocks)
288 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
291 struct hfs_iget_data {
292 struct hfs_cat_key *key;
296 static int hfs_test_inode(struct inode *inode, void *data)
298 struct hfs_iget_data *idata = data;
304 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
306 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
316 static int hfs_read_inode(struct inode *inode, void *data)
318 struct hfs_iget_data *idata = data;
319 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
322 HFS_I(inode)->flags = 0;
323 HFS_I(inode)->rsrc_inode = NULL;
324 mutex_init(&HFS_I(inode)->extents_lock);
325 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
326 spin_lock_init(&HFS_I(inode)->open_dir_lock);
328 /* Initialize the inode */
329 inode->i_uid = hsb->s_uid;
330 inode->i_gid = hsb->s_gid;
334 HFS_I(inode)->cat_key = *idata->key;
336 HFS_I(inode)->flags |= HFS_FLG_RSRC;
337 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
342 if (!HFS_IS_RSRC(inode)) {
343 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
344 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
346 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
347 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
350 inode->i_ino = be32_to_cpu(rec->file.FlNum);
351 inode->i_mode = S_IRUGO | S_IXUGO;
352 if (!(rec->file.Flags & HFS_FIL_LOCK))
353 inode->i_mode |= S_IWUGO;
354 inode->i_mode &= ~hsb->s_file_umask;
355 inode->i_mode |= S_IFREG;
356 inode->i_ctime = inode->i_atime = inode->i_mtime =
357 hfs_m_to_utime(rec->file.MdDat);
358 inode->i_op = &hfs_file_inode_operations;
359 inode->i_fop = &hfs_file_operations;
360 inode->i_mapping->a_ops = &hfs_aops;
363 inode->i_ino = be32_to_cpu(rec->dir.DirID);
364 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
365 HFS_I(inode)->fs_blocks = 0;
366 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
367 inode->i_ctime = inode->i_atime = inode->i_mtime =
368 hfs_m_to_utime(rec->dir.MdDat);
369 inode->i_op = &hfs_dir_inode_operations;
370 inode->i_fop = &hfs_dir_operations;
373 make_bad_inode(inode);
381 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
382 * the catalog B-tree and the 'type' of the desired file return the
383 * inode for that file/directory or NULL. Note that 'type' indicates
384 * whether we want the actual file or directory, or the corresponding
385 * metadata (AppleDouble header file or CAP metadata file).
387 struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
389 struct hfs_iget_data data = { key, rec };
395 cnid = be32_to_cpu(rec->dir.DirID);
398 cnid = be32_to_cpu(rec->file.FlNum);
403 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
404 if (inode && (inode->i_state & I_NEW))
405 unlock_new_inode(inode);
409 void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
410 __be32 *log_size, __be32 *phys_size)
412 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
415 *log_size = cpu_to_be32(inode->i_size);
417 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
418 HFS_SB(inode->i_sb)->alloc_blksz);
421 int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
423 struct inode *main_inode = inode;
424 struct hfs_find_data fd;
428 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
429 res = hfs_ext_write_extent(inode);
433 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
434 switch (inode->i_ino) {
438 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
441 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
449 if (HFS_IS_RSRC(inode))
450 main_inode = HFS_I(inode)->rsrc_inode;
452 if (!main_inode->i_nlink)
455 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
460 if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN)
462 fd.search_key->cat = HFS_I(main_inode)->cat_key;
463 if (hfs_brec_find(&fd))
466 if (S_ISDIR(main_inode->i_mode)) {
467 if (fd.entrylength < sizeof(struct hfs_cat_dir))
469 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
470 sizeof(struct hfs_cat_dir));
471 if (rec.type != HFS_CDR_DIR ||
472 be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
475 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
476 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
478 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
479 sizeof(struct hfs_cat_dir));
480 } else if (HFS_IS_RSRC(inode)) {
481 if (fd.entrylength < sizeof(struct hfs_cat_file))
483 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
484 sizeof(struct hfs_cat_file));
485 hfs_inode_write_fork(inode, rec.file.RExtRec,
486 &rec.file.RLgLen, &rec.file.RPyLen);
487 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
488 sizeof(struct hfs_cat_file));
490 if (fd.entrylength < sizeof(struct hfs_cat_file))
492 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
493 sizeof(struct hfs_cat_file));
494 if (rec.type != HFS_CDR_FIL ||
495 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
498 if (inode->i_mode & S_IWUSR)
499 rec.file.Flags &= ~HFS_FIL_LOCK;
501 rec.file.Flags |= HFS_FIL_LOCK;
502 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
503 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
505 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
506 sizeof(struct hfs_cat_file));
514 static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
517 struct inode *inode = NULL;
519 struct hfs_find_data fd;
522 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
525 inode = HFS_I(dir)->rsrc_inode;
529 inode = new_inode(dir->i_sb);
531 return ERR_PTR(-ENOMEM);
533 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
538 fd.search_key->cat = HFS_I(dir)->cat_key;
539 res = hfs_brec_read(&fd, &rec, sizeof(rec));
541 struct hfs_iget_data idata = { NULL, &rec };
542 hfs_read_inode(inode, &idata);
549 HFS_I(inode)->rsrc_inode = dir;
550 HFS_I(dir)->rsrc_inode = inode;
552 inode_fake_hash(inode);
553 mark_inode_dirty(inode);
556 return d_splice_alias(inode, dentry);
559 void hfs_evict_inode(struct inode *inode)
561 truncate_inode_pages_final(&inode->i_data);
563 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
564 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
565 iput(HFS_I(inode)->rsrc_inode);
569 static int hfs_file_open(struct inode *inode, struct file *file)
571 if (HFS_IS_RSRC(inode))
572 inode = HFS_I(inode)->rsrc_inode;
573 atomic_inc(&HFS_I(inode)->opencnt);
577 static int hfs_file_release(struct inode *inode, struct file *file)
579 //struct super_block *sb = inode->i_sb;
581 if (HFS_IS_RSRC(inode))
582 inode = HFS_I(inode)->rsrc_inode;
583 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
585 hfs_file_truncate(inode);
586 //if (inode->i_flags & S_DEAD) {
587 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
588 // hfs_delete_inode(inode);
596 * hfs_notify_change()
598 * Based very closely on fs/msdos/inode.c by Werner Almesberger
600 * This is the notify_change() field in the super_operations structure
601 * for HFS file systems. The purpose is to take that changes made to
602 * an inode and apply then in a filesystem-dependent manner. In this
603 * case the process has a few of tasks to do:
604 * 1) prevent changes to the i_uid and i_gid fields.
605 * 2) map file permissions to the closest allowable permissions
606 * 3) Since multiple Linux files can share the same on-disk inode under
607 * HFS (for instance the data and resource forks of a file) a change
608 * to permissions must be applied to all other in-core inodes which
609 * correspond to the same HFS file.
612 int hfs_inode_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
615 struct inode *inode = d_inode(dentry);
616 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
619 error = setattr_prepare(&init_user_ns, dentry,
620 attr); /* basic permission checks */
624 /* no uig/gid changes and limit which mode bits can be set */
625 if (((attr->ia_valid & ATTR_UID) &&
626 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
627 ((attr->ia_valid & ATTR_GID) &&
628 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
629 ((attr->ia_valid & ATTR_MODE) &&
630 ((S_ISDIR(inode->i_mode) &&
631 (attr->ia_mode != inode->i_mode)) ||
632 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
633 return hsb->s_quiet ? 0 : error;
636 if (attr->ia_valid & ATTR_MODE) {
637 /* Only the 'w' bits can ever change and only all together. */
638 if (attr->ia_mode & S_IWUSR)
639 attr->ia_mode = inode->i_mode | S_IWUGO;
641 attr->ia_mode = inode->i_mode & ~S_IWUGO;
642 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
645 if ((attr->ia_valid & ATTR_SIZE) &&
646 attr->ia_size != i_size_read(inode)) {
647 inode_dio_wait(inode);
649 error = inode_newsize_ok(inode, attr->ia_size);
653 truncate_setsize(inode, attr->ia_size);
654 hfs_file_truncate(inode);
655 inode->i_atime = inode->i_mtime = inode->i_ctime =
659 setattr_copy(&init_user_ns, inode, attr);
660 mark_inode_dirty(inode);
664 static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
667 struct inode *inode = filp->f_mapping->host;
668 struct super_block * sb;
671 ret = file_write_and_wait_range(filp, start, end);
676 /* sync the inode to buffers */
677 ret = write_inode_now(inode, 0);
679 /* sync the superblock to buffers */
681 flush_delayed_work(&HFS_SB(sb)->mdb_work);
682 /* .. finally sync the buffers to disk */
683 err = sync_blockdev(sb->s_bdev);
690 static const struct file_operations hfs_file_operations = {
691 .llseek = generic_file_llseek,
692 .read_iter = generic_file_read_iter,
693 .write_iter = generic_file_write_iter,
694 .mmap = generic_file_mmap,
695 .splice_read = generic_file_splice_read,
696 .fsync = hfs_file_fsync,
697 .open = hfs_file_open,
698 .release = hfs_file_release,
701 static const struct inode_operations hfs_file_inode_operations = {
702 .lookup = hfs_file_lookup,
703 .setattr = hfs_inode_setattr,
704 .listxattr = generic_listxattr,