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fs: Convert iomap_readpage to iomap_read_folio
[linux-block.git] / fs / hfs / inode.c
CommitLineData
1da177e4
LT		 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>
1da177e4 15#include <linux/mpage.h>
e8edc6e0 16#include <linux/sched.h>
5b825c3a 17#include <linux/cred.h>
e2e40f2c 18#include <linux/uio.h>
b8020eff 19#include <linux/xattr.h>
3f1266f1 20#include <linux/blkdev.h>
1da177e4
LT		 21
22#include "hfs_fs.h"
23#include "btree.h"
24
4b6f5d20 25static const struct file_operations hfs_file_operations;
92e1d5be 26static const struct inode_operations hfs_file_inode_operations;
1da177e4
LT		 27
28/*================ Variable-like macros ================*/
29
30#define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO)
31
32static int hfs_writepage(struct page *page, struct writeback_control *wbc)
33{
34 return block_write_full_page(page, hfs_get_block, wbc);
35}
36
37static int hfs_readpage(struct file *file, struct page *page)
38{
39 return block_read_full_page(page, hfs_get_block);
40}
41
c8cf464b
MS		 42static void hfs_write_failed(struct address_space *mapping, loff_t to)
43{
44 struct inode *inode = mapping->host;
45
46 if (to > inode->i_size) {
7caef267 47 truncate_pagecache(inode, inode->i_size);
c8cf464b
MS		 48 hfs_file_truncate(inode);
49 }
50}
51
cfef1f7b
MWO		 52int hfs_write_begin(struct file *file, struct address_space *mapping,
53 loff_t pos, unsigned len, struct page **pagep, void **fsdata)
1da177e4 54{
282dc178
CH		 55 int ret;
56
7903d9ee 57 *pagep = NULL;
be3bbbc5 58 ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
7903d9ee
NP		 59 hfs_get_block,
60 &HFS_I(mapping->host)->phys_size);
c8cf464b
MS		 61 if (unlikely(ret))
62 hfs_write_failed(mapping, pos + len);
282dc178
CH		 63
64 return ret;
1da177e4
LT		 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
27496a8c 72static int hfs_releasepage(struct page *page, gfp_t mask)
1da177e4
LT		 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 }
eb2e5f45
DA		 92
93 if (!tree)
94 return 0;
95
09cbfeaf
KS		 96 if (tree->node_size >= PAGE_SIZE) {
97 nidx = page->index >> (tree->node_size_shift - PAGE_SHIFT);
1da177e4
LT		 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 {
09cbfeaf
KS		 110 nidx = page->index << (PAGE_SHIFT - tree->node_size_shift);
111 i = 1 << (PAGE_SHIFT - tree->node_size_shift);
1da177e4
LT		 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 }
1da177e4
LT		 126 return res ? try_to_free_buffers(page) : 0;
127}
128
c8b8e32d 129static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
1da177e4
LT		 130{
131 struct file *file = iocb->ki_filp;
c8cf464b 132 struct address_space *mapping = file->f_mapping;
93c76a3d 133 struct inode *inode = mapping->host;
a6cbcd4a 134 size_t count = iov_iter_count(iter);
eafdc7d1 135 ssize_t ret;
1da177e4 136
c8b8e32d 137 ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
eafdc7d1
CH		 138
139 /*
140 * In case of error extending write may have instantiated a few
141 * blocks outside i_size. Trim these off again.
142 */
6f673763 143 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
eafdc7d1 144 loff_t isize = i_size_read(inode);
c8b8e32d 145 loff_t end = iocb->ki_pos + count;
eafdc7d1
CH		 146
147 if (end > isize)
c8cf464b 148 hfs_write_failed(mapping, end);
eafdc7d1
CH		 149 }
150
151 return ret;
1da177e4
LT		 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
f5e54d6e 160const struct address_space_operations hfs_btree_aops = {
e621900a 161 .dirty_folio = block_dirty_folio,
7ba13abb 162 .invalidate_folio = block_invalidate_folio,
1da177e4
LT		 163 .readpage = hfs_readpage,
164 .writepage = hfs_writepage,
7903d9ee
NP		 165 .write_begin = hfs_write_begin,
166 .write_end = generic_write_end,
1da177e4
LT		 167 .bmap = hfs_bmap,
168 .releasepage = hfs_releasepage,
169};
170
f5e54d6e 171const struct address_space_operations hfs_aops = {
e621900a 172 .dirty_folio = block_dirty_folio,
7ba13abb 173 .invalidate_folio = block_invalidate_folio,
1da177e4
LT		 174 .readpage = hfs_readpage,
175 .writepage = hfs_writepage,
7903d9ee
NP		 176 .write_begin = hfs_write_begin,
177 .write_end = generic_write_end,
1da177e4
LT		 178 .bmap = hfs_bmap,
179 .direct_IO = hfs_direct_IO,
180 .writepages = hfs_writepages,
181};
182
183/*
184 * hfs_new_inode
185 */
71e93963 186struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
1da177e4
LT		 187{
188 struct super_block *sb = dir->i_sb;
189 struct inode *inode = new_inode(sb);
190 if (!inode)
191 return NULL;
192
39f8d472 193 mutex_init(&HFS_I(inode)->extents_lock);
1da177e4 194 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
9717a91b 195 spin_lock_init(&HFS_I(inode)->open_dir_lock);
328b9227 196 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
1da177e4
LT		 197 inode->i_ino = HFS_SB(sb)->next_id++;
198 inode->i_mode = mode;
94c9a5ee
DH		 199 inode->i_uid = current_fsuid();
200 inode->i_gid = current_fsgid();
bfe86848 201 set_nlink(inode, 1);
02027d42 202 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
1da177e4
LT		 203 HFS_I(inode)->flags = 0;
204 HFS_I(inode)->rsrc_inode = NULL;
205 HFS_I(inode)->fs_blocks = 0;
206 if (S_ISDIR(mode)) {
207 inode->i_size = 2;
208 HFS_SB(sb)->folder_count++;
209 if (dir->i_ino == HFS_ROOT_CNID)
210 HFS_SB(sb)->root_dirs++;
211 inode->i_op = &hfs_dir_inode_operations;
212 inode->i_fop = &hfs_dir_operations;
213 inode->i_mode |= S_IRWXUGO;
214 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
215 } else if (S_ISREG(mode)) {
216 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
217 HFS_SB(sb)->file_count++;
218 if (dir->i_ino == HFS_ROOT_CNID)
219 HFS_SB(sb)->root_files++;
220 inode->i_op = &hfs_file_inode_operations;
221 inode->i_fop = &hfs_file_operations;
222 inode->i_mapping->a_ops = &hfs_aops;
223 inode->i_mode |= S_IRUGO|S_IXUGO;
224 if (mode & S_IWUSR)
225 inode->i_mode |= S_IWUGO;
226 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
227 HFS_I(inode)->phys_size = 0;
228 HFS_I(inode)->alloc_blocks = 0;
229 HFS_I(inode)->first_blocks = 0;
230 HFS_I(inode)->cached_start = 0;
231 HFS_I(inode)->cached_blocks = 0;
232 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
233 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
234 }
235 insert_inode_hash(inode);
236 mark_inode_dirty(inode);
237 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
5687b578 238 hfs_mark_mdb_dirty(sb);
1da177e4
LT		 239
240 return inode;
241}
242
243void hfs_delete_inode(struct inode *inode)
244{
245 struct super_block *sb = inode->i_sb;
246
c2b3e1f7 247 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
1da177e4
LT		 248 if (S_ISDIR(inode->i_mode)) {
249 HFS_SB(sb)->folder_count--;
250 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
251 HFS_SB(sb)->root_dirs--;
252 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
5687b578 253 hfs_mark_mdb_dirty(sb);
1da177e4
LT		 254 return;
255 }
256 HFS_SB(sb)->file_count--;
257 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
258 HFS_SB(sb)->root_files--;
259 if (S_ISREG(inode->i_mode)) {
260 if (!inode->i_nlink) {
261 inode->i_size = 0;
262 hfs_file_truncate(inode);
263 }
264 }
265 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
5687b578 266 hfs_mark_mdb_dirty(sb);
1da177e4
LT		 267}
268
269void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
270 __be32 __log_size, __be32 phys_size, u32 clump_size)
271{
272 struct super_block *sb = inode->i_sb;
273 u32 log_size = be32_to_cpu(__log_size);
274 u16 count;
275 int i;
276
277 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
278 for (count = 0, i = 0; i < 3; i++)
279 count += be16_to_cpu(ext[i].count);
280 HFS_I(inode)->first_blocks = count;
281
282 inode->i_size = HFS_I(inode)->phys_size = log_size;
283 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
284 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
285 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
286 HFS_SB(sb)->alloc_blksz;
287 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
288 if (!HFS_I(inode)->clump_blocks)
289 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
290}
291
292struct hfs_iget_data {
293 struct hfs_cat_key *key;
294 hfs_cat_rec *rec;
295};
296
297static int hfs_test_inode(struct inode *inode, void *data)
298{
299 struct hfs_iget_data *idata = data;
300 hfs_cat_rec *rec;
301
302 rec = idata->rec;
303 switch (rec->type) {
304 case HFS_CDR_DIR:
305 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
306 case HFS_CDR_FIL:
307 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
308 default:
309 BUG();
310 return 1;
311 }
312}
313
314/*
315 * hfs_read_inode
316 */
317static int hfs_read_inode(struct inode *inode, void *data)
318{
319 struct hfs_iget_data *idata = data;
320 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
321 hfs_cat_rec *rec;
322
323 HFS_I(inode)->flags = 0;
324 HFS_I(inode)->rsrc_inode = NULL;
39f8d472 325 mutex_init(&HFS_I(inode)->extents_lock);
1da177e4 326 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
9717a91b 327 spin_lock_init(&HFS_I(inode)->open_dir_lock);
1da177e4
LT		 328
329 /* Initialize the inode */
330 inode->i_uid = hsb->s_uid;
331 inode->i_gid = hsb->s_gid;
bfe86848 332 set_nlink(inode, 1);
1da177e4
LT		 333
334 if (idata->key)
335 HFS_I(inode)->cat_key = *idata->key;
336 else
337 HFS_I(inode)->flags |= HFS_FLG_RSRC;
338 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
339
340 rec = idata->rec;
341 switch (rec->type) {
342 case HFS_CDR_FIL:
343 if (!HFS_IS_RSRC(inode)) {
344 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
345 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
346 } else {
347 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
348 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
349 }
350
351 inode->i_ino = be32_to_cpu(rec->file.FlNum);
352 inode->i_mode = S_IRUGO | S_IXUGO;
353 if (!(rec->file.Flags & HFS_FIL_LOCK))
354 inode->i_mode |= S_IWUGO;
355 inode->i_mode &= ~hsb->s_file_umask;
356 inode->i_mode |= S_IFREG;
357 inode->i_ctime = inode->i_atime = inode->i_mtime =
4ddfc3dc 358 hfs_m_to_utime(rec->file.MdDat);
1da177e4
LT		 359 inode->i_op = &hfs_file_inode_operations;
360 inode->i_fop = &hfs_file_operations;
361 inode->i_mapping->a_ops = &hfs_aops;
362 break;
363 case HFS_CDR_DIR:
364 inode->i_ino = be32_to_cpu(rec->dir.DirID);
365 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
366 HFS_I(inode)->fs_blocks = 0;
367 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
368 inode->i_ctime = inode->i_atime = inode->i_mtime =
4ddfc3dc 369 hfs_m_to_utime(rec->dir.MdDat);
1da177e4
LT		 370 inode->i_op = &hfs_dir_inode_operations;
371 inode->i_fop = &hfs_dir_operations;
372 break;
373 default:
374 make_bad_inode(inode);
375 }
376 return 0;
377}
378
379/*
380 * __hfs_iget()
381 *
382 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
383 * the catalog B-tree and the 'type' of the desired file return the
384 * inode for that file/directory or NULL. Note that 'type' indicates
385 * whether we want the actual file or directory, or the corresponding
386 * metadata (AppleDouble header file or CAP metadata file).
387 */
388struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
389{
390 struct hfs_iget_data data = { key, rec };
391 struct inode *inode;
392 u32 cnid;
393
394 switch (rec->type) {
395 case HFS_CDR_DIR:
396 cnid = be32_to_cpu(rec->dir.DirID);
397 break;
398 case HFS_CDR_FIL:
399 cnid = be32_to_cpu(rec->file.FlNum);
400 break;
401 default:
402 return NULL;
403 }
404 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
405 if (inode && (inode->i_state & I_NEW))
406 unlock_new_inode(inode);
407 return inode;
408}
409
410void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
411 __be32 *log_size, __be32 *phys_size)
412{
413 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
414
415 if (log_size)
416 *log_size = cpu_to_be32(inode->i_size);
417 if (phys_size)
418 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
419 HFS_SB(inode->i_sb)->alloc_blksz);
420}
421
a9185b41 422int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1da177e4
LT		 423{
424 struct inode *main_inode = inode;
425 struct hfs_find_data fd;
426 hfs_cat_rec rec;
9509f178 427 int res;
1da177e4 428
c2b3e1f7 429 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
9509f178
AK		 430 res = hfs_ext_write_extent(inode);
431 if (res)
432 return res;
1da177e4
LT		 433
434 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
435 switch (inode->i_ino) {
436 case HFS_ROOT_CNID:
437 break;
438 case HFS_EXT_CNID:
439 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
440 return 0;
441 case HFS_CAT_CNID:
442 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
443 return 0;
444 default:
445 BUG();
446 return -EIO;
447 }
448 }
449
450 if (HFS_IS_RSRC(inode))
451 main_inode = HFS_I(inode)->rsrc_inode;
452
453 if (!main_inode->i_nlink)
454 return 0;
455
456 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
457 /* panic? */
458 return -EIO;
459
460 fd.search_key->cat = HFS_I(main_inode)->cat_key;
461 if (hfs_brec_find(&fd))
462 /* panic? */
463 goto out;
464
465 if (S_ISDIR(main_inode->i_mode)) {
55d1cbbb 466 WARN_ON(fd.entrylength < sizeof(struct hfs_cat_dir));
1da177e4
LT		 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->i_mtime);
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 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
480 sizeof(struct hfs_cat_file));
481 hfs_inode_write_fork(inode, rec.file.RExtRec,
482 &rec.file.RLgLen, &rec.file.RPyLen);
483 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
484 sizeof(struct hfs_cat_file));
485 } else {
55d1cbbb 486 WARN_ON(fd.entrylength < sizeof(struct hfs_cat_file));
1da177e4
LT		 487 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
488 sizeof(struct hfs_cat_file));
489 if (rec.type != HFS_CDR_FIL ||
490 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
491 }
492
493 if (inode->i_mode & S_IWUSR)
494 rec.file.Flags &= ~HFS_FIL_LOCK;
495 else
496 rec.file.Flags |= HFS_FIL_LOCK;
497 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
498 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
499
500 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
501 sizeof(struct hfs_cat_file));
502 }
503out:
504 hfs_find_exit(&fd);
505 return 0;
506}
507
508static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
00cd8dd3 509 unsigned int flags)
1da177e4
LT		 510{
511 struct inode *inode = NULL;
512 hfs_cat_rec rec;
513 struct hfs_find_data fd;
514 int res;
515
516 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
517 goto out;
518
519 inode = HFS_I(dir)->rsrc_inode;
520 if (inode)
521 goto out;
522
523 inode = new_inode(dir->i_sb);
524 if (!inode)
525 return ERR_PTR(-ENOMEM);
526
9509f178
AK		 527 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
528 if (res) {
529 iput(inode);
530 return ERR_PTR(res);
531 }
1da177e4
LT		 532 fd.search_key->cat = HFS_I(dir)->cat_key;
533 res = hfs_brec_read(&fd, &rec, sizeof(rec));
534 if (!res) {
535 struct hfs_iget_data idata = { NULL, &rec };
536 hfs_read_inode(inode, &idata);
537 }
538 hfs_find_exit(&fd);
539 if (res) {
540 iput(inode);
541 return ERR_PTR(res);
542 }
543 HFS_I(inode)->rsrc_inode = dir;
544 HFS_I(dir)->rsrc_inode = inode;
545 igrab(dir);
5bef9151 546 inode_fake_hash(inode);
1da177e4 547 mark_inode_dirty(inode);
0e5c56fd 548 dont_mount(dentry);
1da177e4 549out:
6b9cceea 550 return d_splice_alias(inode, dentry);
1da177e4
LT		 551}
552
b57922d9 553void hfs_evict_inode(struct inode *inode)
1da177e4 554{
91b0abe3 555 truncate_inode_pages_final(&inode->i_data);
dbd5768f 556 clear_inode(inode);
1da177e4
LT		 557 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
558 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
559 iput(HFS_I(inode)->rsrc_inode);
560 }
561}
562
1da177e4
LT		 563static int hfs_file_open(struct inode *inode, struct file *file)
564{
565 if (HFS_IS_RSRC(inode))
566 inode = HFS_I(inode)->rsrc_inode;
1da177e4
LT		 567 atomic_inc(&HFS_I(inode)->opencnt);
568 return 0;
569}
570
571static int hfs_file_release(struct inode *inode, struct file *file)
572{
573 //struct super_block *sb = inode->i_sb;
574
575 if (HFS_IS_RSRC(inode))
576 inode = HFS_I(inode)->rsrc_inode;
1da177e4 577 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
5955102c 578 inode_lock(inode);
1da177e4
LT		 579 hfs_file_truncate(inode);
580 //if (inode->i_flags & S_DEAD) {
581 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
582 // hfs_delete_inode(inode);
583 //}
5955102c 584 inode_unlock(inode);
1da177e4
LT		 585 }
586 return 0;
587}
588
589/*
590 * hfs_notify_change()
591 *
592 * Based very closely on fs/msdos/inode.c by Werner Almesberger
593 *
594 * This is the notify_change() field in the super_operations structure
595 * for HFS file systems. The purpose is to take that changes made to
596 * an inode and apply then in a filesystem-dependent manner. In this
597 * case the process has a few of tasks to do:
598 * 1) prevent changes to the i_uid and i_gid fields.
599 * 2) map file permissions to the closest allowable permissions
600 * 3) Since multiple Linux files can share the same on-disk inode under
601 * HFS (for instance the data and resource forks of a file) a change
602 * to permissions must be applied to all other in-core inodes which
603 * correspond to the same HFS file.
604 */
605
549c7297
CB		 606int hfs_inode_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
607 struct iattr *attr)
1da177e4 608{
2b0143b5 609 struct inode *inode = d_inode(dentry);
1da177e4
LT		 610 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
611 int error;
612
549c7297
CB		 613 error = setattr_prepare(&init_user_ns, dentry,
614 attr); /* basic permission checks */
1da177e4
LT		 615 if (error)
616 return error;
617
618 /* no uig/gid changes and limit which mode bits can be set */
619 if (((attr->ia_valid & ATTR_UID) &&
43b5e4cc 620 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
1da177e4 621 ((attr->ia_valid & ATTR_GID) &&
43b5e4cc 622 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
1da177e4
LT		 623 ((attr->ia_valid & ATTR_MODE) &&
624 ((S_ISDIR(inode->i_mode) &&
625 (attr->ia_mode != inode->i_mode)) ||
626 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
627 return hsb->s_quiet ? 0 : error;
628 }
629
630 if (attr->ia_valid & ATTR_MODE) {
631 /* Only the 'w' bits can ever change and only all together. */
632 if (attr->ia_mode & S_IWUSR)
633 attr->ia_mode = inode->i_mode | S_IWUGO;
634 else
635 attr->ia_mode = inode->i_mode & ~S_IWUGO;
636 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
637 }
1da177e4 638
1025774c
CH		 639 if ((attr->ia_valid & ATTR_SIZE) &&
640 attr->ia_size != i_size_read(inode)) {
562c72aa
CH		 641 inode_dio_wait(inode);
642
c8cf464b 643 error = inode_newsize_ok(inode, attr->ia_size);
1025774c
CH		 644 if (error)
645 return error;
c8cf464b
MS		 646
647 truncate_setsize(inode, attr->ia_size);
648 hfs_file_truncate(inode);
8cd3cb50
EF		 649 inode->i_atime = inode->i_mtime = inode->i_ctime =
650 current_time(inode);
1025774c
CH		 651 }
652
2f221d6f 653 setattr_copy(&init_user_ns, inode, attr);
1025774c 654 mark_inode_dirty(inode);
1da177e4
LT		 655 return 0;
656}
657
02c24a82
JB		 658static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
659 int datasync)
b5fc510c
AV		 660{
661 struct inode *inode = filp->f_mapping->host;
662 struct super_block * sb;
663 int ret, err;
664
3b49c9a1 665 ret = file_write_and_wait_range(filp, start, end);
02c24a82
JB		 666 if (ret)
667 return ret;
5955102c 668 inode_lock(inode);
02c24a82 669
b5fc510c
AV		 670 /* sync the inode to buffers */
671 ret = write_inode_now(inode, 0);
672
673 /* sync the superblock to buffers */
674 sb = inode->i_sb;
43829731 675 flush_delayed_work(&HFS_SB(sb)->mdb_work);
b5fc510c
AV		 676 /* .. finally sync the buffers to disk */
677 err = sync_blockdev(sb->s_bdev);
678 if (!ret)
679 ret = err;
5955102c 680 inode_unlock(inode);
b5fc510c
AV		 681 return ret;
682}
1da177e4 683
4b6f5d20 684static const struct file_operations hfs_file_operations = {
1da177e4 685 .llseek = generic_file_llseek,
aad4f8bb 686 .read_iter = generic_file_read_iter,
8174202b 687 .write_iter = generic_file_write_iter,
1da177e4 688 .mmap = generic_file_mmap,
5ffc4ef4 689 .splice_read = generic_file_splice_read,
b5fc510c 690 .fsync = hfs_file_fsync,
1da177e4
LT		 691 .open = hfs_file_open,
692 .release = hfs_file_release,
693};
694
92e1d5be 695static const struct inode_operations hfs_file_inode_operations = {
1da177e4 696 .lookup = hfs_file_lookup,
1da177e4 697 .setattr = hfs_inode_setattr,
b8020eff 698 .listxattr = generic_listxattr,
1da177e4 699};
Linux 6.x block layer and io_uring tree(s)