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v6.9.4
  1/*
  2 *  linux/fs/hfs/inode.c
  3 *
  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.
  7 *
  8 * This file contains inode-related functions which do not depend on
  9 * which scheme is being used to represent forks.
 10 *
 11 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
 12 */
 13
 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>
 21
 22#include "hfs_fs.h"
 23#include "btree.h"
 24
 25static const struct file_operations hfs_file_operations;
 26static const struct inode_operations hfs_file_inode_operations;
 27
 28/*================ Variable-like macros ================*/
 29
 30#define HFS_VALID_MODE_BITS  (S_IFREG | S_IFDIR | S_IRWXUGO)
 31
 32static int hfs_read_folio(struct file *file, struct folio *folio)
 33{
 34	return block_read_full_folio(folio, hfs_get_block);
 35}
 36
 37static void hfs_write_failed(struct address_space *mapping, loff_t to)
 38{
 39	struct inode *inode = mapping->host;
 40
 41	if (to > inode->i_size) {
 42		truncate_pagecache(inode, inode->i_size);
 43		hfs_file_truncate(inode);
 44	}
 45}
 46
 47int hfs_write_begin(struct file *file, struct address_space *mapping,
 48		loff_t pos, unsigned len, struct page **pagep, void **fsdata)
 49{
 50	int ret;
 51
 52	*pagep = NULL;
 53	ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
 54				hfs_get_block,
 55				&HFS_I(mapping->host)->phys_size);
 56	if (unlikely(ret))
 57		hfs_write_failed(mapping, pos + len);
 58
 59	return ret;
 60}
 61
 62static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
 63{
 64	return generic_block_bmap(mapping, block, hfs_get_block);
 65}
 66
 67static bool hfs_release_folio(struct folio *folio, gfp_t mask)
 68{
 69	struct inode *inode = folio->mapping->host;
 70	struct super_block *sb = inode->i_sb;
 71	struct hfs_btree *tree;
 72	struct hfs_bnode *node;
 73	u32 nidx;
 74	int i;
 75	bool res = true;
 76
 77	switch (inode->i_ino) {
 78	case HFS_EXT_CNID:
 79		tree = HFS_SB(sb)->ext_tree;
 80		break;
 81	case HFS_CAT_CNID:
 82		tree = HFS_SB(sb)->cat_tree;
 83		break;
 84	default:
 85		BUG();
 86		return false;
 87	}
 88
 89	if (!tree)
 90		return false;
 91
 92	if (tree->node_size >= PAGE_SIZE) {
 93		nidx = folio->index >> (tree->node_size_shift - PAGE_SHIFT);
 94		spin_lock(&tree->hash_lock);
 95		node = hfs_bnode_findhash(tree, nidx);
 96		if (!node)
 97			;
 98		else if (atomic_read(&node->refcnt))
 99			res = false;
100		if (res && node) {
101			hfs_bnode_unhash(node);
102			hfs_bnode_free(node);
103		}
104		spin_unlock(&tree->hash_lock);
105	} else {
106		nidx = folio->index << (PAGE_SHIFT - tree->node_size_shift);
107		i = 1 << (PAGE_SHIFT - tree->node_size_shift);
108		spin_lock(&tree->hash_lock);
109		do {
110			node = hfs_bnode_findhash(tree, nidx++);
111			if (!node)
112				continue;
113			if (atomic_read(&node->refcnt)) {
114				res = false;
115				break;
116			}
117			hfs_bnode_unhash(node);
118			hfs_bnode_free(node);
119		} while (--i && nidx < tree->node_count);
120		spin_unlock(&tree->hash_lock);
121	}
122	return res ? try_to_free_buffers(folio) : false;
123}
124
125static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
126{
127	struct file *file = iocb->ki_filp;
128	struct address_space *mapping = file->f_mapping;
129	struct inode *inode = mapping->host;
130	size_t count = iov_iter_count(iter);
131	ssize_t ret;
132
133	ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
134
135	/*
136	 * In case of error extending write may have instantiated a few
137	 * blocks outside i_size. Trim these off again.
138	 */
139	if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
140		loff_t isize = i_size_read(inode);
141		loff_t end = iocb->ki_pos + count;
142
143		if (end > isize)
144			hfs_write_failed(mapping, end);
145	}
146
147	return ret;
148}
149
150static int hfs_writepages(struct address_space *mapping,
151			  struct writeback_control *wbc)
152{
153	return mpage_writepages(mapping, wbc, hfs_get_block);
154}
155
156const struct address_space_operations hfs_btree_aops = {
157	.dirty_folio	= block_dirty_folio,
158	.invalidate_folio = block_invalidate_folio,
159	.read_folio	= hfs_read_folio,
160	.writepages	= hfs_writepages,
161	.write_begin	= hfs_write_begin,
162	.write_end	= generic_write_end,
163	.migrate_folio	= buffer_migrate_folio,
164	.bmap		= hfs_bmap,
165	.release_folio	= hfs_release_folio,
166};
167
168const struct address_space_operations hfs_aops = {
169	.dirty_folio	= block_dirty_folio,
170	.invalidate_folio = block_invalidate_folio,
171	.read_folio	= hfs_read_folio,
172	.write_begin	= hfs_write_begin,
173	.write_end	= generic_write_end,
174	.bmap		= hfs_bmap,
175	.direct_IO	= hfs_direct_IO,
176	.writepages	= hfs_writepages,
177	.migrate_folio	= buffer_migrate_folio,
178};
179
180/*
181 * hfs_new_inode
182 */
183struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
184{
185	struct super_block *sb = dir->i_sb;
186	struct inode *inode = new_inode(sb);
187	if (!inode)
188		return NULL;
189
190	mutex_init(&HFS_I(inode)->extents_lock);
191	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
192	spin_lock_init(&HFS_I(inode)->open_dir_lock);
193	hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
194	inode->i_ino = HFS_SB(sb)->next_id++;
195	inode->i_mode = mode;
196	inode->i_uid = current_fsuid();
197	inode->i_gid = current_fsgid();
198	set_nlink(inode, 1);
199	simple_inode_init_ts(inode);
200	HFS_I(inode)->flags = 0;
201	HFS_I(inode)->rsrc_inode = NULL;
202	HFS_I(inode)->fs_blocks = 0;
 
203	if (S_ISDIR(mode)) {
204		inode->i_size = 2;
205		HFS_SB(sb)->folder_count++;
206		if (dir->i_ino == HFS_ROOT_CNID)
207			HFS_SB(sb)->root_dirs++;
208		inode->i_op = &hfs_dir_inode_operations;
209		inode->i_fop = &hfs_dir_operations;
210		inode->i_mode |= S_IRWXUGO;
211		inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
212	} else if (S_ISREG(mode)) {
213		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
214		HFS_SB(sb)->file_count++;
215		if (dir->i_ino == HFS_ROOT_CNID)
216			HFS_SB(sb)->root_files++;
217		inode->i_op = &hfs_file_inode_operations;
218		inode->i_fop = &hfs_file_operations;
219		inode->i_mapping->a_ops = &hfs_aops;
220		inode->i_mode |= S_IRUGO|S_IXUGO;
221		if (mode & S_IWUSR)
222			inode->i_mode |= S_IWUGO;
223		inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
224		HFS_I(inode)->phys_size = 0;
225		HFS_I(inode)->alloc_blocks = 0;
226		HFS_I(inode)->first_blocks = 0;
227		HFS_I(inode)->cached_start = 0;
228		HFS_I(inode)->cached_blocks = 0;
229		memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
230		memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
231	}
232	insert_inode_hash(inode);
233	mark_inode_dirty(inode);
234	set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
235	hfs_mark_mdb_dirty(sb);
236
237	return inode;
238}
239
240void hfs_delete_inode(struct inode *inode)
241{
242	struct super_block *sb = inode->i_sb;
243
244	hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
245	if (S_ISDIR(inode->i_mode)) {
246		HFS_SB(sb)->folder_count--;
247		if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
248			HFS_SB(sb)->root_dirs--;
249		set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
250		hfs_mark_mdb_dirty(sb);
251		return;
252	}
253	HFS_SB(sb)->file_count--;
254	if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
255		HFS_SB(sb)->root_files--;
256	if (S_ISREG(inode->i_mode)) {
257		if (!inode->i_nlink) {
258			inode->i_size = 0;
259			hfs_file_truncate(inode);
260		}
261	}
262	set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
263	hfs_mark_mdb_dirty(sb);
264}
265
266void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
267			 __be32 __log_size, __be32 phys_size, u32 clump_size)
268{
269	struct super_block *sb = inode->i_sb;
270	u32 log_size = be32_to_cpu(__log_size);
271	u16 count;
272	int i;
273
274	memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
275	for (count = 0, i = 0; i < 3; i++)
276		count += be16_to_cpu(ext[i].count);
277	HFS_I(inode)->first_blocks = count;
 
 
278
279	inode->i_size = HFS_I(inode)->phys_size = log_size;
280	HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
281	inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
282	HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
283				     HFS_SB(sb)->alloc_blksz;
284	HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
285	if (!HFS_I(inode)->clump_blocks)
286		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
287}
288
289struct hfs_iget_data {
290	struct hfs_cat_key *key;
291	hfs_cat_rec *rec;
292};
293
294static int hfs_test_inode(struct inode *inode, void *data)
295{
296	struct hfs_iget_data *idata = data;
297	hfs_cat_rec *rec;
298
299	rec = idata->rec;
300	switch (rec->type) {
301	case HFS_CDR_DIR:
302		return inode->i_ino == be32_to_cpu(rec->dir.DirID);
303	case HFS_CDR_FIL:
304		return inode->i_ino == be32_to_cpu(rec->file.FlNum);
305	default:
306		BUG();
307		return 1;
308	}
309}
310
311/*
312 * hfs_read_inode
313 */
314static int hfs_read_inode(struct inode *inode, void *data)
315{
316	struct hfs_iget_data *idata = data;
317	struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
318	hfs_cat_rec *rec;
319
320	HFS_I(inode)->flags = 0;
321	HFS_I(inode)->rsrc_inode = NULL;
322	mutex_init(&HFS_I(inode)->extents_lock);
323	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
324	spin_lock_init(&HFS_I(inode)->open_dir_lock);
325
326	/* Initialize the inode */
327	inode->i_uid = hsb->s_uid;
328	inode->i_gid = hsb->s_gid;
329	set_nlink(inode, 1);
330
331	if (idata->key)
332		HFS_I(inode)->cat_key = *idata->key;
333	else
334		HFS_I(inode)->flags |= HFS_FLG_RSRC;
335	HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
336
337	rec = idata->rec;
338	switch (rec->type) {
339	case HFS_CDR_FIL:
340		if (!HFS_IS_RSRC(inode)) {
341			hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
342					    rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
343		} else {
344			hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
345					    rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
346		}
347
348		inode->i_ino = be32_to_cpu(rec->file.FlNum);
349		inode->i_mode = S_IRUGO | S_IXUGO;
350		if (!(rec->file.Flags & HFS_FIL_LOCK))
351			inode->i_mode |= S_IWUGO;
352		inode->i_mode &= ~hsb->s_file_umask;
353		inode->i_mode |= S_IFREG;
354		inode_set_mtime_to_ts(inode,
355				      inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, hfs_m_to_utime(rec->file.MdDat))));
356		inode->i_op = &hfs_file_inode_operations;
357		inode->i_fop = &hfs_file_operations;
358		inode->i_mapping->a_ops = &hfs_aops;
359		break;
360	case HFS_CDR_DIR:
361		inode->i_ino = be32_to_cpu(rec->dir.DirID);
362		inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
363		HFS_I(inode)->fs_blocks = 0;
364		inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
365		inode_set_mtime_to_ts(inode,
366				      inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, hfs_m_to_utime(rec->dir.MdDat))));
367		inode->i_op = &hfs_dir_inode_operations;
368		inode->i_fop = &hfs_dir_operations;
369		break;
370	default:
371		make_bad_inode(inode);
372	}
373	return 0;
374}
375
376/*
377 * __hfs_iget()
378 *
379 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
380 * the catalog B-tree and the 'type' of the desired file return the
381 * inode for that file/directory or NULL.  Note that 'type' indicates
382 * whether we want the actual file or directory, or the corresponding
383 * metadata (AppleDouble header file or CAP metadata file).
384 */
385struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
386{
387	struct hfs_iget_data data = { key, rec };
388	struct inode *inode;
389	u32 cnid;
390
391	switch (rec->type) {
392	case HFS_CDR_DIR:
393		cnid = be32_to_cpu(rec->dir.DirID);
394		break;
395	case HFS_CDR_FIL:
396		cnid = be32_to_cpu(rec->file.FlNum);
397		break;
398	default:
399		return NULL;
400	}
401	inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
402	if (inode && (inode->i_state & I_NEW))
403		unlock_new_inode(inode);
404	return inode;
405}
406
407void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
408			  __be32 *log_size, __be32 *phys_size)
409{
410	memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
411
412	if (log_size)
413		*log_size = cpu_to_be32(inode->i_size);
414	if (phys_size)
415		*phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
416					 HFS_SB(inode->i_sb)->alloc_blksz);
417}
418
419int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
420{
421	struct inode *main_inode = inode;
422	struct hfs_find_data fd;
423	hfs_cat_rec rec;
424	int res;
425
426	hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
427	res = hfs_ext_write_extent(inode);
428	if (res)
429		return res;
430
431	if (inode->i_ino < HFS_FIRSTUSER_CNID) {
432		switch (inode->i_ino) {
433		case HFS_ROOT_CNID:
434			break;
435		case HFS_EXT_CNID:
436			hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
437			return 0;
438		case HFS_CAT_CNID:
439			hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
440			return 0;
441		default:
442			BUG();
443			return -EIO;
444		}
445	}
446
447	if (HFS_IS_RSRC(inode))
448		main_inode = HFS_I(inode)->rsrc_inode;
449
450	if (!main_inode->i_nlink)
451		return 0;
452
453	if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
454		/* panic? */
455		return -EIO;
456
457	res = -EIO;
458	if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN)
459		goto out;
460	fd.search_key->cat = HFS_I(main_inode)->cat_key;
461	if (hfs_brec_find(&fd))
462		goto out;
463
464	if (S_ISDIR(main_inode->i_mode)) {
465		if (fd.entrylength < sizeof(struct hfs_cat_dir))
466			goto out;
467		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
468			   sizeof(struct hfs_cat_dir));
469		if (rec.type != HFS_CDR_DIR ||
470		    be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
471		}
472
473		rec.dir.MdDat = hfs_u_to_mtime(inode_get_mtime(inode));
474		rec.dir.Val = cpu_to_be16(inode->i_size - 2);
475
476		hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
477			    sizeof(struct hfs_cat_dir));
478	} else if (HFS_IS_RSRC(inode)) {
479		if (fd.entrylength < sizeof(struct hfs_cat_file))
480			goto out;
481		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
482			       sizeof(struct hfs_cat_file));
483		hfs_inode_write_fork(inode, rec.file.RExtRec,
484				     &rec.file.RLgLen, &rec.file.RPyLen);
485		hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
486				sizeof(struct hfs_cat_file));
487	} else {
488		if (fd.entrylength < sizeof(struct hfs_cat_file))
489			goto out;
490		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
491			   sizeof(struct hfs_cat_file));
492		if (rec.type != HFS_CDR_FIL ||
493		    be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
494		}
495
496		if (inode->i_mode & S_IWUSR)
497			rec.file.Flags &= ~HFS_FIL_LOCK;
498		else
499			rec.file.Flags |= HFS_FIL_LOCK;
500		hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
501		rec.file.MdDat = hfs_u_to_mtime(inode_get_mtime(inode));
502
503		hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
504			    sizeof(struct hfs_cat_file));
505	}
506	res = 0;
507out:
508	hfs_find_exit(&fd);
509	return res;
510}
511
512static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
513				      unsigned int flags)
514{
515	struct inode *inode = NULL;
516	hfs_cat_rec rec;
517	struct hfs_find_data fd;
518	int res;
519
520	if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
521		goto out;
522
523	inode = HFS_I(dir)->rsrc_inode;
524	if (inode)
525		goto out;
526
527	inode = new_inode(dir->i_sb);
528	if (!inode)
529		return ERR_PTR(-ENOMEM);
530
531	res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
532	if (res) {
533		iput(inode);
534		return ERR_PTR(res);
535	}
536	fd.search_key->cat = HFS_I(dir)->cat_key;
537	res = hfs_brec_read(&fd, &rec, sizeof(rec));
538	if (!res) {
539		struct hfs_iget_data idata = { NULL, &rec };
540		hfs_read_inode(inode, &idata);
541	}
542	hfs_find_exit(&fd);
543	if (res) {
544		iput(inode);
545		return ERR_PTR(res);
546	}
547	HFS_I(inode)->rsrc_inode = dir;
548	HFS_I(dir)->rsrc_inode = inode;
549	igrab(dir);
550	inode_fake_hash(inode);
551	mark_inode_dirty(inode);
552	dont_mount(dentry);
553out:
554	return d_splice_alias(inode, dentry);
555}
556
557void hfs_evict_inode(struct inode *inode)
558{
559	truncate_inode_pages_final(&inode->i_data);
560	clear_inode(inode);
561	if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
562		HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
563		iput(HFS_I(inode)->rsrc_inode);
564	}
565}
566
567static int hfs_file_open(struct inode *inode, struct file *file)
568{
569	if (HFS_IS_RSRC(inode))
570		inode = HFS_I(inode)->rsrc_inode;
571	atomic_inc(&HFS_I(inode)->opencnt);
572	return 0;
573}
574
575static int hfs_file_release(struct inode *inode, struct file *file)
576{
577	//struct super_block *sb = inode->i_sb;
578
579	if (HFS_IS_RSRC(inode))
580		inode = HFS_I(inode)->rsrc_inode;
581	if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
582		inode_lock(inode);
583		hfs_file_truncate(inode);
584		//if (inode->i_flags & S_DEAD) {
585		//	hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
586		//	hfs_delete_inode(inode);
587		//}
588		inode_unlock(inode);
589	}
590	return 0;
591}
592
593/*
594 * hfs_notify_change()
595 *
596 * Based very closely on fs/msdos/inode.c by Werner Almesberger
597 *
598 * This is the notify_change() field in the super_operations structure
599 * for HFS file systems.  The purpose is to take that changes made to
600 * an inode and apply then in a filesystem-dependent manner.  In this
601 * case the process has a few of tasks to do:
602 *  1) prevent changes to the i_uid and i_gid fields.
603 *  2) map file permissions to the closest allowable permissions
604 *  3) Since multiple Linux files can share the same on-disk inode under
605 *     HFS (for instance the data and resource forks of a file) a change
606 *     to permissions must be applied to all other in-core inodes which
607 *     correspond to the same HFS file.
608 */
609
610int hfs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
611		      struct iattr *attr)
612{
613	struct inode *inode = d_inode(dentry);
614	struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
615	int error;
616
617	error = setattr_prepare(&nop_mnt_idmap, dentry,
618				attr); /* basic permission checks */
619	if (error)
620		return error;
621
622	/* no uig/gid changes and limit which mode bits can be set */
623	if (((attr->ia_valid & ATTR_UID) &&
624	     (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
625	    ((attr->ia_valid & ATTR_GID) &&
626	     (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
627	    ((attr->ia_valid & ATTR_MODE) &&
628	     ((S_ISDIR(inode->i_mode) &&
629	       (attr->ia_mode != inode->i_mode)) ||
630	      (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
631		return hsb->s_quiet ? 0 : error;
632	}
633
634	if (attr->ia_valid & ATTR_MODE) {
635		/* Only the 'w' bits can ever change and only all together. */
636		if (attr->ia_mode & S_IWUSR)
637			attr->ia_mode = inode->i_mode | S_IWUGO;
638		else
639			attr->ia_mode = inode->i_mode & ~S_IWUGO;
640		attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
641	}
642
643	if ((attr->ia_valid & ATTR_SIZE) &&
644	    attr->ia_size != i_size_read(inode)) {
645		inode_dio_wait(inode);
646
647		error = inode_newsize_ok(inode, attr->ia_size);
648		if (error)
649			return error;
650
651		truncate_setsize(inode, attr->ia_size);
652		hfs_file_truncate(inode);
653		simple_inode_init_ts(inode);
654	}
655
656	setattr_copy(&nop_mnt_idmap, inode, attr);
657	mark_inode_dirty(inode);
658	return 0;
659}
660
661static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
662			  int datasync)
663{
664	struct inode *inode = filp->f_mapping->host;
665	struct super_block * sb;
666	int ret, err;
667
668	ret = file_write_and_wait_range(filp, start, end);
669	if (ret)
670		return ret;
671	inode_lock(inode);
672
673	/* sync the inode to buffers */
674	ret = write_inode_now(inode, 0);
675
676	/* sync the superblock to buffers */
677	sb = inode->i_sb;
678	flush_delayed_work(&HFS_SB(sb)->mdb_work);
679	/* .. finally sync the buffers to disk */
680	err = sync_blockdev(sb->s_bdev);
681	if (!ret)
682		ret = err;
683	inode_unlock(inode);
684	return ret;
685}
686
687static const struct file_operations hfs_file_operations = {
688	.llseek		= generic_file_llseek,
689	.read_iter	= generic_file_read_iter,
690	.write_iter	= generic_file_write_iter,
691	.mmap		= generic_file_mmap,
692	.splice_read	= filemap_splice_read,
693	.fsync		= hfs_file_fsync,
694	.open		= hfs_file_open,
695	.release	= hfs_file_release,
696};
697
698static const struct inode_operations hfs_file_inode_operations = {
699	.lookup		= hfs_file_lookup,
700	.setattr	= hfs_inode_setattr,
701	.listxattr	= generic_listxattr,
702};
v6.13.7
  1/*
  2 *  linux/fs/hfs/inode.c
  3 *
  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.
  7 *
  8 * This file contains inode-related functions which do not depend on
  9 * which scheme is being used to represent forks.
 10 *
 11 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
 12 */
 13
 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>
 21
 22#include "hfs_fs.h"
 23#include "btree.h"
 24
 25static const struct file_operations hfs_file_operations;
 26static const struct inode_operations hfs_file_inode_operations;
 27
 28/*================ Variable-like macros ================*/
 29
 30#define HFS_VALID_MODE_BITS  (S_IFREG | S_IFDIR | S_IRWXUGO)
 31
 32static int hfs_read_folio(struct file *file, struct folio *folio)
 33{
 34	return block_read_full_folio(folio, hfs_get_block);
 35}
 36
 37static void hfs_write_failed(struct address_space *mapping, loff_t to)
 38{
 39	struct inode *inode = mapping->host;
 40
 41	if (to > inode->i_size) {
 42		truncate_pagecache(inode, inode->i_size);
 43		hfs_file_truncate(inode);
 44	}
 45}
 46
 47int hfs_write_begin(struct file *file, struct address_space *mapping,
 48		loff_t pos, unsigned len, struct folio **foliop, void **fsdata)
 49{
 50	int ret;
 51
 52	ret = cont_write_begin(file, mapping, pos, len, foliop, fsdata,
 
 53				hfs_get_block,
 54				&HFS_I(mapping->host)->phys_size);
 55	if (unlikely(ret))
 56		hfs_write_failed(mapping, pos + len);
 57
 58	return ret;
 59}
 60
 61static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
 62{
 63	return generic_block_bmap(mapping, block, hfs_get_block);
 64}
 65
 66static bool hfs_release_folio(struct folio *folio, gfp_t mask)
 67{
 68	struct inode *inode = folio->mapping->host;
 69	struct super_block *sb = inode->i_sb;
 70	struct hfs_btree *tree;
 71	struct hfs_bnode *node;
 72	u32 nidx;
 73	int i;
 74	bool res = true;
 75
 76	switch (inode->i_ino) {
 77	case HFS_EXT_CNID:
 78		tree = HFS_SB(sb)->ext_tree;
 79		break;
 80	case HFS_CAT_CNID:
 81		tree = HFS_SB(sb)->cat_tree;
 82		break;
 83	default:
 84		BUG();
 85		return false;
 86	}
 87
 88	if (!tree)
 89		return false;
 90
 91	if (tree->node_size >= PAGE_SIZE) {
 92		nidx = folio->index >> (tree->node_size_shift - PAGE_SHIFT);
 93		spin_lock(&tree->hash_lock);
 94		node = hfs_bnode_findhash(tree, nidx);
 95		if (!node)
 96			;
 97		else if (atomic_read(&node->refcnt))
 98			res = false;
 99		if (res && node) {
100			hfs_bnode_unhash(node);
101			hfs_bnode_free(node);
102		}
103		spin_unlock(&tree->hash_lock);
104	} else {
105		nidx = folio->index << (PAGE_SHIFT - tree->node_size_shift);
106		i = 1 << (PAGE_SHIFT - tree->node_size_shift);
107		spin_lock(&tree->hash_lock);
108		do {
109			node = hfs_bnode_findhash(tree, nidx++);
110			if (!node)
111				continue;
112			if (atomic_read(&node->refcnt)) {
113				res = false;
114				break;
115			}
116			hfs_bnode_unhash(node);
117			hfs_bnode_free(node);
118		} while (--i && nidx < tree->node_count);
119		spin_unlock(&tree->hash_lock);
120	}
121	return res ? try_to_free_buffers(folio) : false;
122}
123
124static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
125{
126	struct file *file = iocb->ki_filp;
127	struct address_space *mapping = file->f_mapping;
128	struct inode *inode = mapping->host;
129	size_t count = iov_iter_count(iter);
130	ssize_t ret;
131
132	ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
133
134	/*
135	 * In case of error extending write may have instantiated a few
136	 * blocks outside i_size. Trim these off again.
137	 */
138	if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
139		loff_t isize = i_size_read(inode);
140		loff_t end = iocb->ki_pos + count;
141
142		if (end > isize)
143			hfs_write_failed(mapping, end);
144	}
145
146	return ret;
147}
148
149static int hfs_writepages(struct address_space *mapping,
150			  struct writeback_control *wbc)
151{
152	return mpage_writepages(mapping, wbc, hfs_get_block);
153}
154
155const struct address_space_operations hfs_btree_aops = {
156	.dirty_folio	= block_dirty_folio,
157	.invalidate_folio = block_invalidate_folio,
158	.read_folio	= hfs_read_folio,
159	.writepages	= hfs_writepages,
160	.write_begin	= hfs_write_begin,
161	.write_end	= generic_write_end,
162	.migrate_folio	= buffer_migrate_folio,
163	.bmap		= hfs_bmap,
164	.release_folio	= hfs_release_folio,
165};
166
167const struct address_space_operations hfs_aops = {
168	.dirty_folio	= block_dirty_folio,
169	.invalidate_folio = block_invalidate_folio,
170	.read_folio	= hfs_read_folio,
171	.write_begin	= hfs_write_begin,
172	.write_end	= generic_write_end,
173	.bmap		= hfs_bmap,
174	.direct_IO	= hfs_direct_IO,
175	.writepages	= hfs_writepages,
176	.migrate_folio	= buffer_migrate_folio,
177};
178
179/*
180 * hfs_new_inode
181 */
182struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
183{
184	struct super_block *sb = dir->i_sb;
185	struct inode *inode = new_inode(sb);
186	if (!inode)
187		return NULL;
188
189	mutex_init(&HFS_I(inode)->extents_lock);
190	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
191	spin_lock_init(&HFS_I(inode)->open_dir_lock);
192	hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
193	inode->i_ino = HFS_SB(sb)->next_id++;
194	inode->i_mode = mode;
195	inode->i_uid = current_fsuid();
196	inode->i_gid = current_fsgid();
197	set_nlink(inode, 1);
198	simple_inode_init_ts(inode);
199	HFS_I(inode)->flags = 0;
200	HFS_I(inode)->rsrc_inode = NULL;
201	HFS_I(inode)->fs_blocks = 0;
202	HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
203	if (S_ISDIR(mode)) {
204		inode->i_size = 2;
205		HFS_SB(sb)->folder_count++;
206		if (dir->i_ino == HFS_ROOT_CNID)
207			HFS_SB(sb)->root_dirs++;
208		inode->i_op = &hfs_dir_inode_operations;
209		inode->i_fop = &hfs_dir_operations;
210		inode->i_mode |= S_IRWXUGO;
211		inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
212	} else if (S_ISREG(mode)) {
213		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
214		HFS_SB(sb)->file_count++;
215		if (dir->i_ino == HFS_ROOT_CNID)
216			HFS_SB(sb)->root_files++;
217		inode->i_op = &hfs_file_inode_operations;
218		inode->i_fop = &hfs_file_operations;
219		inode->i_mapping->a_ops = &hfs_aops;
220		inode->i_mode |= S_IRUGO|S_IXUGO;
221		if (mode & S_IWUSR)
222			inode->i_mode |= S_IWUGO;
223		inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
224		HFS_I(inode)->phys_size = 0;
225		HFS_I(inode)->alloc_blocks = 0;
226		HFS_I(inode)->first_blocks = 0;
227		HFS_I(inode)->cached_start = 0;
228		HFS_I(inode)->cached_blocks = 0;
229		memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
230		memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
231	}
232	insert_inode_hash(inode);
233	mark_inode_dirty(inode);
234	set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
235	hfs_mark_mdb_dirty(sb);
236
237	return inode;
238}
239
240void hfs_delete_inode(struct inode *inode)
241{
242	struct super_block *sb = inode->i_sb;
243
244	hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
245	if (S_ISDIR(inode->i_mode)) {
246		HFS_SB(sb)->folder_count--;
247		if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
248			HFS_SB(sb)->root_dirs--;
249		set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
250		hfs_mark_mdb_dirty(sb);
251		return;
252	}
253	HFS_SB(sb)->file_count--;
254	if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
255		HFS_SB(sb)->root_files--;
256	if (S_ISREG(inode->i_mode)) {
257		if (!inode->i_nlink) {
258			inode->i_size = 0;
259			hfs_file_truncate(inode);
260		}
261	}
262	set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
263	hfs_mark_mdb_dirty(sb);
264}
265
266void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
267			 __be32 __log_size, __be32 phys_size, u32 clump_size)
268{
269	struct super_block *sb = inode->i_sb;
270	u32 log_size = be32_to_cpu(__log_size);
271	u16 count;
272	int i;
273
274	memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
275	for (count = 0, i = 0; i < 3; i++)
276		count += be16_to_cpu(ext[i].count);
277	HFS_I(inode)->first_blocks = count;
278	HFS_I(inode)->cached_start = 0;
279	HFS_I(inode)->cached_blocks = 0;
280
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;
289}
290
291struct hfs_iget_data {
292	struct hfs_cat_key *key;
293	hfs_cat_rec *rec;
294};
295
296static int hfs_test_inode(struct inode *inode, void *data)
297{
298	struct hfs_iget_data *idata = data;
299	hfs_cat_rec *rec;
300
301	rec = idata->rec;
302	switch (rec->type) {
303	case HFS_CDR_DIR:
304		return inode->i_ino == be32_to_cpu(rec->dir.DirID);
305	case HFS_CDR_FIL:
306		return inode->i_ino == be32_to_cpu(rec->file.FlNum);
307	default:
308		BUG();
309		return 1;
310	}
311}
312
313/*
314 * hfs_read_inode
315 */
316static int hfs_read_inode(struct inode *inode, void *data)
317{
318	struct hfs_iget_data *idata = data;
319	struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
320	hfs_cat_rec *rec;
321
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);
327
328	/* Initialize the inode */
329	inode->i_uid = hsb->s_uid;
330	inode->i_gid = hsb->s_gid;
331	set_nlink(inode, 1);
332
333	if (idata->key)
334		HFS_I(inode)->cat_key = *idata->key;
335	else
336		HFS_I(inode)->flags |= HFS_FLG_RSRC;
337	HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
338
339	rec = idata->rec;
340	switch (rec->type) {
341	case HFS_CDR_FIL:
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));
345		} else {
346			hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
347					    rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
348		}
349
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_set_mtime_to_ts(inode,
357				      inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, 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;
361		break;
362	case HFS_CDR_DIR:
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_set_mtime_to_ts(inode,
368				      inode_set_atime_to_ts(inode, inode_set_ctime_to_ts(inode, hfs_m_to_utime(rec->dir.MdDat))));
369		inode->i_op = &hfs_dir_inode_operations;
370		inode->i_fop = &hfs_dir_operations;
371		break;
372	default:
373		make_bad_inode(inode);
374	}
375	return 0;
376}
377
378/*
379 * __hfs_iget()
380 *
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).
386 */
387struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
388{
389	struct hfs_iget_data data = { key, rec };
390	struct inode *inode;
391	u32 cnid;
392
393	switch (rec->type) {
394	case HFS_CDR_DIR:
395		cnid = be32_to_cpu(rec->dir.DirID);
396		break;
397	case HFS_CDR_FIL:
398		cnid = be32_to_cpu(rec->file.FlNum);
399		break;
400	default:
401		return NULL;
402	}
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);
406	return inode;
407}
408
409void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
410			  __be32 *log_size, __be32 *phys_size)
411{
412	memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
413
414	if (log_size)
415		*log_size = cpu_to_be32(inode->i_size);
416	if (phys_size)
417		*phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
418					 HFS_SB(inode->i_sb)->alloc_blksz);
419}
420
421int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
422{
423	struct inode *main_inode = inode;
424	struct hfs_find_data fd;
425	hfs_cat_rec rec;
426	int res;
427
428	hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
429	res = hfs_ext_write_extent(inode);
430	if (res)
431		return res;
432
433	if (inode->i_ino < HFS_FIRSTUSER_CNID) {
434		switch (inode->i_ino) {
435		case HFS_ROOT_CNID:
436			break;
437		case HFS_EXT_CNID:
438			hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
439			return 0;
440		case HFS_CAT_CNID:
441			hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
442			return 0;
443		default:
444			BUG();
445			return -EIO;
446		}
447	}
448
449	if (HFS_IS_RSRC(inode))
450		main_inode = HFS_I(inode)->rsrc_inode;
451
452	if (!main_inode->i_nlink)
453		return 0;
454
455	if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
456		/* panic? */
457		return -EIO;
458
459	res = -EIO;
460	if (HFS_I(main_inode)->cat_key.CName.len > HFS_NAMELEN)
461		goto out;
462	fd.search_key->cat = HFS_I(main_inode)->cat_key;
463	if (hfs_brec_find(&fd))
464		goto out;
465
466	if (S_ISDIR(main_inode->i_mode)) {
467		if (fd.entrylength < sizeof(struct hfs_cat_dir))
468			goto out;
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) {
473		}
474
475		rec.dir.MdDat = hfs_u_to_mtime(inode_get_mtime(inode));
476		rec.dir.Val = cpu_to_be16(inode->i_size - 2);
477
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))
482			goto out;
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));
489	} else {
490		if (fd.entrylength < sizeof(struct hfs_cat_file))
491			goto out;
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) {
496		}
497
498		if (inode->i_mode & S_IWUSR)
499			rec.file.Flags &= ~HFS_FIL_LOCK;
500		else
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_get_mtime(inode));
504
505		hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
506			    sizeof(struct hfs_cat_file));
507	}
508	res = 0;
509out:
510	hfs_find_exit(&fd);
511	return res;
512}
513
514static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
515				      unsigned int flags)
516{
517	struct inode *inode = NULL;
518	hfs_cat_rec rec;
519	struct hfs_find_data fd;
520	int res;
521
522	if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
523		goto out;
524
525	inode = HFS_I(dir)->rsrc_inode;
526	if (inode)
527		goto out;
528
529	inode = new_inode(dir->i_sb);
530	if (!inode)
531		return ERR_PTR(-ENOMEM);
532
533	res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
534	if (res) {
535		iput(inode);
536		return ERR_PTR(res);
537	}
538	fd.search_key->cat = HFS_I(dir)->cat_key;
539	res = hfs_brec_read(&fd, &rec, sizeof(rec));
540	if (!res) {
541		struct hfs_iget_data idata = { NULL, &rec };
542		hfs_read_inode(inode, &idata);
543	}
544	hfs_find_exit(&fd);
545	if (res) {
546		iput(inode);
547		return ERR_PTR(res);
548	}
549	HFS_I(inode)->rsrc_inode = dir;
550	HFS_I(dir)->rsrc_inode = inode;
551	igrab(dir);
552	inode_fake_hash(inode);
553	mark_inode_dirty(inode);
554	dont_mount(dentry);
555out:
556	return d_splice_alias(inode, dentry);
557}
558
559void hfs_evict_inode(struct inode *inode)
560{
561	truncate_inode_pages_final(&inode->i_data);
562	clear_inode(inode);
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);
566	}
567}
568
569static int hfs_file_open(struct inode *inode, struct file *file)
570{
571	if (HFS_IS_RSRC(inode))
572		inode = HFS_I(inode)->rsrc_inode;
573	atomic_inc(&HFS_I(inode)->opencnt);
574	return 0;
575}
576
577static int hfs_file_release(struct inode *inode, struct file *file)
578{
579	//struct super_block *sb = inode->i_sb;
580
581	if (HFS_IS_RSRC(inode))
582		inode = HFS_I(inode)->rsrc_inode;
583	if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
584		inode_lock(inode);
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);
589		//}
590		inode_unlock(inode);
591	}
592	return 0;
593}
594
595/*
596 * hfs_notify_change()
597 *
598 * Based very closely on fs/msdos/inode.c by Werner Almesberger
599 *
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.
610 */
611
612int hfs_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
613		      struct iattr *attr)
614{
615	struct inode *inode = d_inode(dentry);
616	struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
617	int error;
618
619	error = setattr_prepare(&nop_mnt_idmap, dentry,
620				attr); /* basic permission checks */
621	if (error)
622		return error;
623
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;
634	}
635
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;
640		else
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;
643	}
644
645	if ((attr->ia_valid & ATTR_SIZE) &&
646	    attr->ia_size != i_size_read(inode)) {
647		inode_dio_wait(inode);
648
649		error = inode_newsize_ok(inode, attr->ia_size);
650		if (error)
651			return error;
652
653		truncate_setsize(inode, attr->ia_size);
654		hfs_file_truncate(inode);
655		simple_inode_init_ts(inode);
656	}
657
658	setattr_copy(&nop_mnt_idmap, inode, attr);
659	mark_inode_dirty(inode);
660	return 0;
661}
662
663static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
664			  int datasync)
665{
666	struct inode *inode = filp->f_mapping->host;
667	struct super_block * sb;
668	int ret, err;
669
670	ret = file_write_and_wait_range(filp, start, end);
671	if (ret)
672		return ret;
673	inode_lock(inode);
674
675	/* sync the inode to buffers */
676	ret = write_inode_now(inode, 0);
677
678	/* sync the superblock to buffers */
679	sb = inode->i_sb;
680	flush_delayed_work(&HFS_SB(sb)->mdb_work);
681	/* .. finally sync the buffers to disk */
682	err = sync_blockdev(sb->s_bdev);
683	if (!ret)
684		ret = err;
685	inode_unlock(inode);
686	return ret;
687}
688
689static const struct file_operations hfs_file_operations = {
690	.llseek		= generic_file_llseek,
691	.read_iter	= generic_file_read_iter,
692	.write_iter	= generic_file_write_iter,
693	.mmap		= generic_file_mmap,
694	.splice_read	= filemap_splice_read,
695	.fsync		= hfs_file_fsync,
696	.open		= hfs_file_open,
697	.release	= hfs_file_release,
698};
699
700static const struct inode_operations hfs_file_inode_operations = {
701	.lookup		= hfs_file_lookup,
702	.setattr	= hfs_inode_setattr,
703	.listxattr	= generic_listxattr,
704};