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v4.17
  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
 21#include "hfs_fs.h"
 22#include "btree.h"
 23
 24static const struct file_operations hfs_file_operations;
 25static const struct inode_operations hfs_file_inode_operations;
 26
 27/*================ Variable-like macros ================*/
 28
 29#define HFS_VALID_MODE_BITS  (S_IFREG | S_IFDIR | S_IRWXUGO)
 30
 31static int hfs_writepage(struct page *page, struct writeback_control *wbc)
 32{
 33	return block_write_full_page(page, hfs_get_block, wbc);
 34}
 35
 36static int hfs_readpage(struct file *file, struct page *page)
 37{
 38	return block_read_full_page(page, hfs_get_block);
 39}
 40
 41static void hfs_write_failed(struct address_space *mapping, loff_t to)
 42{
 43	struct inode *inode = mapping->host;
 44
 45	if (to > inode->i_size) {
 46		truncate_pagecache(inode, inode->i_size);
 47		hfs_file_truncate(inode);
 48	}
 49}
 50
 51static int hfs_write_begin(struct file *file, struct address_space *mapping,
 52			loff_t pos, unsigned len, unsigned flags,
 53			struct page **pagep, void **fsdata)
 54{
 55	int ret;
 56
 57	*pagep = NULL;
 58	ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
 59				hfs_get_block,
 60				&HFS_I(mapping->host)->phys_size);
 61	if (unlikely(ret))
 62		hfs_write_failed(mapping, pos + len);
 63
 64	return ret;
 65}
 66
 67static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
 68{
 69	return generic_block_bmap(mapping, block, hfs_get_block);
 70}
 71
 72static int hfs_releasepage(struct page *page, gfp_t mask)
 73{
 74	struct inode *inode = page->mapping->host;
 75	struct super_block *sb = inode->i_sb;
 76	struct hfs_btree *tree;
 77	struct hfs_bnode *node;
 78	u32 nidx;
 79	int i, res = 1;
 
 80
 81	switch (inode->i_ino) {
 82	case HFS_EXT_CNID:
 83		tree = HFS_SB(sb)->ext_tree;
 84		break;
 85	case HFS_CAT_CNID:
 86		tree = HFS_SB(sb)->cat_tree;
 87		break;
 88	default:
 89		BUG();
 90		return 0;
 91	}
 92
 93	if (!tree)
 94		return 0;
 95
 96	if (tree->node_size >= PAGE_SIZE) {
 97		nidx = page->index >> (tree->node_size_shift - PAGE_SHIFT);
 98		spin_lock(&tree->hash_lock);
 99		node = hfs_bnode_findhash(tree, nidx);
100		if (!node)
101			;
102		else if (atomic_read(&node->refcnt))
103			res = 0;
104		if (res && node) {
105			hfs_bnode_unhash(node);
106			hfs_bnode_free(node);
107		}
108		spin_unlock(&tree->hash_lock);
109	} else {
110		nidx = page->index << (PAGE_SHIFT - tree->node_size_shift);
111		i = 1 << (PAGE_SHIFT - tree->node_size_shift);
112		spin_lock(&tree->hash_lock);
113		do {
114			node = hfs_bnode_findhash(tree, nidx++);
115			if (!node)
116				continue;
117			if (atomic_read(&node->refcnt)) {
118				res = 0;
119				break;
120			}
121			hfs_bnode_unhash(node);
122			hfs_bnode_free(node);
123		} while (--i && nidx < tree->node_count);
124		spin_unlock(&tree->hash_lock);
125	}
126	return res ? try_to_free_buffers(page) : 0;
127}
128
129static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
130{
131	struct file *file = iocb->ki_filp;
132	struct address_space *mapping = file->f_mapping;
133	struct inode *inode = mapping->host;
134	size_t count = iov_iter_count(iter);
135	ssize_t ret;
136
137	ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
138
139	/*
140	 * In case of error extending write may have instantiated a few
141	 * blocks outside i_size. Trim these off again.
142	 */
143	if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
144		loff_t isize = i_size_read(inode);
145		loff_t end = iocb->ki_pos + count;
146
147		if (end > isize)
148			hfs_write_failed(mapping, end);
149	}
150
151	return ret;
152}
153
154static int hfs_writepages(struct address_space *mapping,
155			  struct writeback_control *wbc)
156{
157	return mpage_writepages(mapping, wbc, hfs_get_block);
158}
159
160const struct address_space_operations hfs_btree_aops = {
161	.readpage	= hfs_readpage,
162	.writepage	= hfs_writepage,
 
 
163	.write_begin	= hfs_write_begin,
164	.write_end	= generic_write_end,
 
165	.bmap		= hfs_bmap,
166	.releasepage	= hfs_releasepage,
167};
168
169const struct address_space_operations hfs_aops = {
170	.readpage	= hfs_readpage,
171	.writepage	= hfs_writepage,
 
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};
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	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
199	HFS_I(inode)->flags = 0;
200	HFS_I(inode)->rsrc_inode = NULL;
201	HFS_I(inode)->fs_blocks = 0;
 
202	if (S_ISDIR(mode)) {
203		inode->i_size = 2;
204		HFS_SB(sb)->folder_count++;
205		if (dir->i_ino == HFS_ROOT_CNID)
206			HFS_SB(sb)->root_dirs++;
207		inode->i_op = &hfs_dir_inode_operations;
208		inode->i_fop = &hfs_dir_operations;
209		inode->i_mode |= S_IRWXUGO;
210		inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
211	} else if (S_ISREG(mode)) {
212		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
213		HFS_SB(sb)->file_count++;
214		if (dir->i_ino == HFS_ROOT_CNID)
215			HFS_SB(sb)->root_files++;
216		inode->i_op = &hfs_file_inode_operations;
217		inode->i_fop = &hfs_file_operations;
218		inode->i_mapping->a_ops = &hfs_aops;
219		inode->i_mode |= S_IRUGO|S_IXUGO;
220		if (mode & S_IWUSR)
221			inode->i_mode |= S_IWUGO;
222		inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
223		HFS_I(inode)->phys_size = 0;
224		HFS_I(inode)->alloc_blocks = 0;
225		HFS_I(inode)->first_blocks = 0;
226		HFS_I(inode)->cached_start = 0;
227		HFS_I(inode)->cached_blocks = 0;
228		memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
229		memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
230	}
231	insert_inode_hash(inode);
232	mark_inode_dirty(inode);
233	set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
234	hfs_mark_mdb_dirty(sb);
235
236	return inode;
237}
238
239void hfs_delete_inode(struct inode *inode)
240{
241	struct super_block *sb = inode->i_sb;
242
243	hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
244	if (S_ISDIR(inode->i_mode)) {
245		HFS_SB(sb)->folder_count--;
246		if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
247			HFS_SB(sb)->root_dirs--;
248		set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
249		hfs_mark_mdb_dirty(sb);
250		return;
251	}
252	HFS_SB(sb)->file_count--;
253	if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
254		HFS_SB(sb)->root_files--;
255	if (S_ISREG(inode->i_mode)) {
256		if (!inode->i_nlink) {
257			inode->i_size = 0;
258			hfs_file_truncate(inode);
259		}
260	}
261	set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
262	hfs_mark_mdb_dirty(sb);
263}
264
265void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
266			 __be32 __log_size, __be32 phys_size, u32 clump_size)
267{
268	struct super_block *sb = inode->i_sb;
269	u32 log_size = be32_to_cpu(__log_size);
270	u16 count;
271	int i;
272
273	memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
274	for (count = 0, i = 0; i < 3; i++)
275		count += be16_to_cpu(ext[i].count);
276	HFS_I(inode)->first_blocks = count;
 
 
277
278	inode->i_size = HFS_I(inode)->phys_size = log_size;
279	HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
280	inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
281	HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
282				     HFS_SB(sb)->alloc_blksz;
283	HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
284	if (!HFS_I(inode)->clump_blocks)
285		HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
286}
287
288struct hfs_iget_data {
289	struct hfs_cat_key *key;
290	hfs_cat_rec *rec;
291};
292
293static int hfs_test_inode(struct inode *inode, void *data)
294{
295	struct hfs_iget_data *idata = data;
296	hfs_cat_rec *rec;
297
298	rec = idata->rec;
299	switch (rec->type) {
300	case HFS_CDR_DIR:
301		return inode->i_ino == be32_to_cpu(rec->dir.DirID);
302	case HFS_CDR_FIL:
303		return inode->i_ino == be32_to_cpu(rec->file.FlNum);
304	default:
305		BUG();
306		return 1;
307	}
308}
309
310/*
311 * hfs_read_inode
312 */
313static int hfs_read_inode(struct inode *inode, void *data)
314{
315	struct hfs_iget_data *idata = data;
316	struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
317	hfs_cat_rec *rec;
318
319	HFS_I(inode)->flags = 0;
320	HFS_I(inode)->rsrc_inode = NULL;
321	mutex_init(&HFS_I(inode)->extents_lock);
322	INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
323	spin_lock_init(&HFS_I(inode)->open_dir_lock);
324
325	/* Initialize the inode */
326	inode->i_uid = hsb->s_uid;
327	inode->i_gid = hsb->s_gid;
328	set_nlink(inode, 1);
329
330	if (idata->key)
331		HFS_I(inode)->cat_key = *idata->key;
332	else
333		HFS_I(inode)->flags |= HFS_FLG_RSRC;
334	HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
335
336	rec = idata->rec;
337	switch (rec->type) {
338	case HFS_CDR_FIL:
339		if (!HFS_IS_RSRC(inode)) {
340			hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
341					    rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
342		} else {
343			hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
344					    rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
345		}
346
347		inode->i_ino = be32_to_cpu(rec->file.FlNum);
348		inode->i_mode = S_IRUGO | S_IXUGO;
349		if (!(rec->file.Flags & HFS_FIL_LOCK))
350			inode->i_mode |= S_IWUGO;
351		inode->i_mode &= ~hsb->s_file_umask;
352		inode->i_mode |= S_IFREG;
353		inode->i_ctime = inode->i_atime = inode->i_mtime =
354				hfs_m_to_utime(rec->file.MdDat);
355		inode->i_op = &hfs_file_inode_operations;
356		inode->i_fop = &hfs_file_operations;
357		inode->i_mapping->a_ops = &hfs_aops;
358		break;
359	case HFS_CDR_DIR:
360		inode->i_ino = be32_to_cpu(rec->dir.DirID);
361		inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
362		HFS_I(inode)->fs_blocks = 0;
363		inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
364		inode->i_ctime = inode->i_atime = inode->i_mtime =
365				hfs_m_to_utime(rec->dir.MdDat);
366		inode->i_op = &hfs_dir_inode_operations;
367		inode->i_fop = &hfs_dir_operations;
368		break;
369	default:
370		make_bad_inode(inode);
371	}
372	return 0;
373}
374
375/*
376 * __hfs_iget()
377 *
378 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
379 * the catalog B-tree and the 'type' of the desired file return the
380 * inode for that file/directory or NULL.  Note that 'type' indicates
381 * whether we want the actual file or directory, or the corresponding
382 * metadata (AppleDouble header file or CAP metadata file).
383 */
384struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
385{
386	struct hfs_iget_data data = { key, rec };
387	struct inode *inode;
388	u32 cnid;
389
390	switch (rec->type) {
391	case HFS_CDR_DIR:
392		cnid = be32_to_cpu(rec->dir.DirID);
393		break;
394	case HFS_CDR_FIL:
395		cnid = be32_to_cpu(rec->file.FlNum);
396		break;
397	default:
398		return NULL;
399	}
400	inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
401	if (inode && (inode->i_state & I_NEW))
402		unlock_new_inode(inode);
403	return inode;
404}
405
406void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
407			  __be32 *log_size, __be32 *phys_size)
408{
409	memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
410
411	if (log_size)
412		*log_size = cpu_to_be32(inode->i_size);
413	if (phys_size)
414		*phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
415					 HFS_SB(inode->i_sb)->alloc_blksz);
416}
417
418int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
419{
420	struct inode *main_inode = inode;
421	struct hfs_find_data fd;
422	hfs_cat_rec rec;
423	int res;
424
425	hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
426	res = hfs_ext_write_extent(inode);
427	if (res)
428		return res;
429
430	if (inode->i_ino < HFS_FIRSTUSER_CNID) {
431		switch (inode->i_ino) {
432		case HFS_ROOT_CNID:
433			break;
434		case HFS_EXT_CNID:
435			hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
436			return 0;
437		case HFS_CAT_CNID:
438			hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
439			return 0;
440		default:
441			BUG();
442			return -EIO;
443		}
444	}
445
446	if (HFS_IS_RSRC(inode))
447		main_inode = HFS_I(inode)->rsrc_inode;
448
449	if (!main_inode->i_nlink)
450		return 0;
451
452	if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
453		/* panic? */
454		return -EIO;
455
 
 
 
456	fd.search_key->cat = HFS_I(main_inode)->cat_key;
457	if (hfs_brec_find(&fd))
458		/* panic? */
459		goto out;
460
461	if (S_ISDIR(main_inode->i_mode)) {
462		if (fd.entrylength < sizeof(struct hfs_cat_dir))
463			/* panic? */;
464		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
465			   sizeof(struct hfs_cat_dir));
466		if (rec.type != HFS_CDR_DIR ||
467		    be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
468		}
469
470		rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
471		rec.dir.Val = cpu_to_be16(inode->i_size - 2);
472
473		hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
474			    sizeof(struct hfs_cat_dir));
475	} else if (HFS_IS_RSRC(inode)) {
 
 
476		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
477			       sizeof(struct hfs_cat_file));
478		hfs_inode_write_fork(inode, rec.file.RExtRec,
479				     &rec.file.RLgLen, &rec.file.RPyLen);
480		hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
481				sizeof(struct hfs_cat_file));
482	} else {
483		if (fd.entrylength < sizeof(struct hfs_cat_file))
484			/* panic? */;
485		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
486			   sizeof(struct hfs_cat_file));
487		if (rec.type != HFS_CDR_FIL ||
488		    be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
489		}
490
491		if (inode->i_mode & S_IWUSR)
492			rec.file.Flags &= ~HFS_FIL_LOCK;
493		else
494			rec.file.Flags |= HFS_FIL_LOCK;
495		hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
496		rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
497
498		hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
499			    sizeof(struct hfs_cat_file));
500	}
 
501out:
502	hfs_find_exit(&fd);
503	return 0;
504}
505
506static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
507				      unsigned int flags)
508{
509	struct inode *inode = NULL;
510	hfs_cat_rec rec;
511	struct hfs_find_data fd;
512	int res;
513
514	if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
515		goto out;
516
517	inode = HFS_I(dir)->rsrc_inode;
518	if (inode)
519		goto out;
520
521	inode = new_inode(dir->i_sb);
522	if (!inode)
523		return ERR_PTR(-ENOMEM);
524
525	res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
526	if (res) {
527		iput(inode);
528		return ERR_PTR(res);
529	}
530	fd.search_key->cat = HFS_I(dir)->cat_key;
531	res = hfs_brec_read(&fd, &rec, sizeof(rec));
532	if (!res) {
533		struct hfs_iget_data idata = { NULL, &rec };
534		hfs_read_inode(inode, &idata);
535	}
536	hfs_find_exit(&fd);
537	if (res) {
538		iput(inode);
539		return ERR_PTR(res);
540	}
541	HFS_I(inode)->rsrc_inode = dir;
542	HFS_I(dir)->rsrc_inode = inode;
543	igrab(dir);
544	hlist_add_fake(&inode->i_hash);
545	mark_inode_dirty(inode);
 
546out:
547	d_add(dentry, inode);
548	return NULL;
549}
550
551void hfs_evict_inode(struct inode *inode)
552{
553	truncate_inode_pages_final(&inode->i_data);
554	clear_inode(inode);
555	if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
556		HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
557		iput(HFS_I(inode)->rsrc_inode);
558	}
559}
560
561static int hfs_file_open(struct inode *inode, struct file *file)
562{
563	if (HFS_IS_RSRC(inode))
564		inode = HFS_I(inode)->rsrc_inode;
565	atomic_inc(&HFS_I(inode)->opencnt);
566	return 0;
567}
568
569static int hfs_file_release(struct inode *inode, struct file *file)
570{
571	//struct super_block *sb = inode->i_sb;
572
573	if (HFS_IS_RSRC(inode))
574		inode = HFS_I(inode)->rsrc_inode;
575	if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
576		inode_lock(inode);
577		hfs_file_truncate(inode);
578		//if (inode->i_flags & S_DEAD) {
579		//	hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
580		//	hfs_delete_inode(inode);
581		//}
582		inode_unlock(inode);
583	}
584	return 0;
585}
586
587/*
588 * hfs_notify_change()
589 *
590 * Based very closely on fs/msdos/inode.c by Werner Almesberger
591 *
592 * This is the notify_change() field in the super_operations structure
593 * for HFS file systems.  The purpose is to take that changes made to
594 * an inode and apply then in a filesystem-dependent manner.  In this
595 * case the process has a few of tasks to do:
596 *  1) prevent changes to the i_uid and i_gid fields.
597 *  2) map file permissions to the closest allowable permissions
598 *  3) Since multiple Linux files can share the same on-disk inode under
599 *     HFS (for instance the data and resource forks of a file) a change
600 *     to permissions must be applied to all other in-core inodes which
601 *     correspond to the same HFS file.
602 */
603
604int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
 
605{
606	struct inode *inode = d_inode(dentry);
607	struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
608	int error;
609
610	error = setattr_prepare(dentry, attr); /* basic permission checks */
 
611	if (error)
612		return error;
613
614	/* no uig/gid changes and limit which mode bits can be set */
615	if (((attr->ia_valid & ATTR_UID) &&
616	     (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
617	    ((attr->ia_valid & ATTR_GID) &&
618	     (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
619	    ((attr->ia_valid & ATTR_MODE) &&
620	     ((S_ISDIR(inode->i_mode) &&
621	       (attr->ia_mode != inode->i_mode)) ||
622	      (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
623		return hsb->s_quiet ? 0 : error;
624	}
625
626	if (attr->ia_valid & ATTR_MODE) {
627		/* Only the 'w' bits can ever change and only all together. */
628		if (attr->ia_mode & S_IWUSR)
629			attr->ia_mode = inode->i_mode | S_IWUGO;
630		else
631			attr->ia_mode = inode->i_mode & ~S_IWUGO;
632		attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
633	}
634
635	if ((attr->ia_valid & ATTR_SIZE) &&
636	    attr->ia_size != i_size_read(inode)) {
637		inode_dio_wait(inode);
638
639		error = inode_newsize_ok(inode, attr->ia_size);
640		if (error)
641			return error;
642
643		truncate_setsize(inode, attr->ia_size);
644		hfs_file_truncate(inode);
 
645	}
646
647	setattr_copy(inode, attr);
648	mark_inode_dirty(inode);
649	return 0;
650}
651
652static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
653			  int datasync)
654{
655	struct inode *inode = filp->f_mapping->host;
656	struct super_block * sb;
657	int ret, err;
658
659	ret = file_write_and_wait_range(filp, start, end);
660	if (ret)
661		return ret;
662	inode_lock(inode);
663
664	/* sync the inode to buffers */
665	ret = write_inode_now(inode, 0);
666
667	/* sync the superblock to buffers */
668	sb = inode->i_sb;
669	flush_delayed_work(&HFS_SB(sb)->mdb_work);
670	/* .. finally sync the buffers to disk */
671	err = sync_blockdev(sb->s_bdev);
672	if (!ret)
673		ret = err;
674	inode_unlock(inode);
675	return ret;
676}
677
678static const struct file_operations hfs_file_operations = {
679	.llseek		= generic_file_llseek,
680	.read_iter	= generic_file_read_iter,
681	.write_iter	= generic_file_write_iter,
682	.mmap		= generic_file_mmap,
683	.splice_read	= generic_file_splice_read,
684	.fsync		= hfs_file_fsync,
685	.open		= hfs_file_open,
686	.release	= hfs_file_release,
687};
688
689static const struct inode_operations hfs_file_inode_operations = {
690	.lookup		= hfs_file_lookup,
691	.setattr	= hfs_inode_setattr,
692	.listxattr	= generic_listxattr,
693};
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};