projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'sh-for-4.9' of git://git.libc.org/linux-sh
[linux-2.6-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>
e2e40f2c 17#include <linux/uio.h>
b8020eff 18#include <linux/xattr.h>
1da177e4
LT		 19
20#include "hfs_fs.h"
21#include "btree.h"
22
4b6f5d20 23static const struct file_operations hfs_file_operations;
92e1d5be 24static const struct inode_operations hfs_file_inode_operations;
1da177e4
LT		 25
26/*================ Variable-like macros ================*/
27
28#define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO)
29
30static int hfs_writepage(struct page *page, struct writeback_control *wbc)
31{
32 return block_write_full_page(page, hfs_get_block, wbc);
33}
34
35static int hfs_readpage(struct file *file, struct page *page)
36{
37 return block_read_full_page(page, hfs_get_block);
38}
39
c8cf464b
MS		 40static void hfs_write_failed(struct address_space *mapping, loff_t to)
41{
42 struct inode *inode = mapping->host;
43
44 if (to > inode->i_size) {
7caef267 45 truncate_pagecache(inode, inode->i_size);
c8cf464b
MS		 46 hfs_file_truncate(inode);
47 }
48}
49
7903d9ee
NP		 50static int hfs_write_begin(struct file *file, struct address_space *mapping,
51 loff_t pos, unsigned len, unsigned flags,
52 struct page **pagep, void **fsdata)
1da177e4 53{
282dc178
CH		 54 int ret;
55
7903d9ee 56 *pagep = NULL;
282dc178 57 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
7903d9ee
NP		 58 hfs_get_block,
59 &HFS_I(mapping->host)->phys_size);
c8cf464b
MS		 60 if (unlikely(ret))
61 hfs_write_failed(mapping, pos + len);
282dc178
CH		 62
63 return ret;
1da177e4
LT		 64}
65
66static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
67{
68 return generic_block_bmap(mapping, block, hfs_get_block);
69}
70
27496a8c 71static int hfs_releasepage(struct page *page, gfp_t mask)
1da177e4
LT		 72{
73 struct inode *inode = page->mapping->host;
74 struct super_block *sb = inode->i_sb;
75 struct hfs_btree *tree;
76 struct hfs_bnode *node;
77 u32 nidx;
78 int i, res = 1;
79
80 switch (inode->i_ino) {
81 case HFS_EXT_CNID:
82 tree = HFS_SB(sb)->ext_tree;
83 break;
84 case HFS_CAT_CNID:
85 tree = HFS_SB(sb)->cat_tree;
86 break;
87 default:
88 BUG();
89 return 0;
90 }
eb2e5f45
DA		 91
92 if (!tree)
93 return 0;
94
09cbfeaf
KS		 95 if (tree->node_size >= PAGE_SIZE) {
96 nidx = page->index >> (tree->node_size_shift - PAGE_SHIFT);
1da177e4
LT		 97 spin_lock(&tree->hash_lock);
98 node = hfs_bnode_findhash(tree, nidx);
99 if (!node)
100 ;
101 else if (atomic_read(&node->refcnt))
102 res = 0;
103 if (res && node) {
104 hfs_bnode_unhash(node);
105 hfs_bnode_free(node);
106 }
107 spin_unlock(&tree->hash_lock);
108 } else {
09cbfeaf
KS		 109 nidx = page->index << (PAGE_SHIFT - tree->node_size_shift);
110 i = 1 << (PAGE_SHIFT - tree->node_size_shift);
1da177e4
LT		 111 spin_lock(&tree->hash_lock);
112 do {
113 node = hfs_bnode_findhash(tree, nidx++);
114 if (!node)
115 continue;
116 if (atomic_read(&node->refcnt)) {
117 res = 0;
118 break;
119 }
120 hfs_bnode_unhash(node);
121 hfs_bnode_free(node);
122 } while (--i && nidx < tree->node_count);
123 spin_unlock(&tree->hash_lock);
124 }
1da177e4
LT		 125 return res ? try_to_free_buffers(page) : 0;
126}
127
c8b8e32d 128static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
1da177e4
LT		 129{
130 struct file *file = iocb->ki_filp;
c8cf464b 131 struct address_space *mapping = file->f_mapping;
93c76a3d 132 struct inode *inode = mapping->host;
a6cbcd4a 133 size_t count = iov_iter_count(iter);
eafdc7d1 134 ssize_t ret;
1da177e4 135
c8b8e32d 136 ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
eafdc7d1
CH		 137
138 /*
139 * In case of error extending write may have instantiated a few
140 * blocks outside i_size. Trim these off again.
141 */
6f673763 142 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
eafdc7d1 143 loff_t isize = i_size_read(inode);
c8b8e32d 144 loff_t end = iocb->ki_pos + count;
eafdc7d1
CH		 145
146 if (end > isize)
c8cf464b 147 hfs_write_failed(mapping, end);
eafdc7d1
CH		 148 }
149
150 return ret;
1da177e4
LT		 151}
152
153static int hfs_writepages(struct address_space *mapping,
154 struct writeback_control *wbc)
155{
156 return mpage_writepages(mapping, wbc, hfs_get_block);
157}
158
f5e54d6e 159const struct address_space_operations hfs_btree_aops = {
1da177e4
LT		 160 .readpage = hfs_readpage,
161 .writepage = hfs_writepage,
7903d9ee
NP		 162 .write_begin = hfs_write_begin,
163 .write_end = generic_write_end,
1da177e4
LT		 164 .bmap = hfs_bmap,
165 .releasepage = hfs_releasepage,
166};
167
f5e54d6e 168const struct address_space_operations hfs_aops = {
1da177e4
LT		 169 .readpage = hfs_readpage,
170 .writepage = hfs_writepage,
7903d9ee
NP		 171 .write_begin = hfs_write_begin,
172 .write_end = generic_write_end,
1da177e4
LT		 173 .bmap = hfs_bmap,
174 .direct_IO = hfs_direct_IO,
175 .writepages = hfs_writepages,
176};
177
178/*
179 * hfs_new_inode
180 */
71e93963 181struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode)
1da177e4
LT		 182{
183 struct super_block *sb = dir->i_sb;
184 struct inode *inode = new_inode(sb);
185 if (!inode)
186 return NULL;
187
39f8d472 188 mutex_init(&HFS_I(inode)->extents_lock);
1da177e4 189 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
9717a91b 190 spin_lock_init(&HFS_I(inode)->open_dir_lock);
328b9227 191 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
1da177e4
LT		 192 inode->i_ino = HFS_SB(sb)->next_id++;
193 inode->i_mode = mode;
94c9a5ee
DH		 194 inode->i_uid = current_fsuid();
195 inode->i_gid = current_fsgid();
bfe86848 196 set_nlink(inode, 1);
02027d42 197 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
1da177e4
LT		 198 HFS_I(inode)->flags = 0;
199 HFS_I(inode)->rsrc_inode = NULL;
200 HFS_I(inode)->fs_blocks = 0;
201 if (S_ISDIR(mode)) {
202 inode->i_size = 2;
203 HFS_SB(sb)->folder_count++;
204 if (dir->i_ino == HFS_ROOT_CNID)
205 HFS_SB(sb)->root_dirs++;
206 inode->i_op = &hfs_dir_inode_operations;
207 inode->i_fop = &hfs_dir_operations;
208 inode->i_mode |= S_IRWXUGO;
209 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
210 } else if (S_ISREG(mode)) {
211 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
212 HFS_SB(sb)->file_count++;
213 if (dir->i_ino == HFS_ROOT_CNID)
214 HFS_SB(sb)->root_files++;
215 inode->i_op = &hfs_file_inode_operations;
216 inode->i_fop = &hfs_file_operations;
217 inode->i_mapping->a_ops = &hfs_aops;
218 inode->i_mode |= S_IRUGO|S_IXUGO;
219 if (mode & S_IWUSR)
220 inode->i_mode |= S_IWUGO;
221 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
222 HFS_I(inode)->phys_size = 0;
223 HFS_I(inode)->alloc_blocks = 0;
224 HFS_I(inode)->first_blocks = 0;
225 HFS_I(inode)->cached_start = 0;
226 HFS_I(inode)->cached_blocks = 0;
227 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
228 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
229 }
230 insert_inode_hash(inode);
231 mark_inode_dirty(inode);
232 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
5687b578 233 hfs_mark_mdb_dirty(sb);
1da177e4
LT		 234
235 return inode;
236}
237
238void hfs_delete_inode(struct inode *inode)
239{
240 struct super_block *sb = inode->i_sb;
241
c2b3e1f7 242 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
1da177e4
LT		 243 if (S_ISDIR(inode->i_mode)) {
244 HFS_SB(sb)->folder_count--;
245 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
246 HFS_SB(sb)->root_dirs--;
247 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
5687b578 248 hfs_mark_mdb_dirty(sb);
1da177e4
LT		 249 return;
250 }
251 HFS_SB(sb)->file_count--;
252 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
253 HFS_SB(sb)->root_files--;
254 if (S_ISREG(inode->i_mode)) {
255 if (!inode->i_nlink) {
256 inode->i_size = 0;
257 hfs_file_truncate(inode);
258 }
259 }
260 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
5687b578 261 hfs_mark_mdb_dirty(sb);
1da177e4
LT		 262}
263
264void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
265 __be32 __log_size, __be32 phys_size, u32 clump_size)
266{
267 struct super_block *sb = inode->i_sb;
268 u32 log_size = be32_to_cpu(__log_size);
269 u16 count;
270 int i;
271
272 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
273 for (count = 0, i = 0; i < 3; i++)
274 count += be16_to_cpu(ext[i].count);
275 HFS_I(inode)->first_blocks = count;
276
277 inode->i_size = HFS_I(inode)->phys_size = log_size;
278 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
279 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
280 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
281 HFS_SB(sb)->alloc_blksz;
282 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
283 if (!HFS_I(inode)->clump_blocks)
284 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
285}
286
287struct hfs_iget_data {
288 struct hfs_cat_key *key;
289 hfs_cat_rec *rec;
290};
291
292static int hfs_test_inode(struct inode *inode, void *data)
293{
294 struct hfs_iget_data *idata = data;
295 hfs_cat_rec *rec;
296
297 rec = idata->rec;
298 switch (rec->type) {
299 case HFS_CDR_DIR:
300 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
301 case HFS_CDR_FIL:
302 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
303 default:
304 BUG();
305 return 1;
306 }
307}
308
309/*
310 * hfs_read_inode
311 */
312static int hfs_read_inode(struct inode *inode, void *data)
313{
314 struct hfs_iget_data *idata = data;
315 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
316 hfs_cat_rec *rec;
317
318 HFS_I(inode)->flags = 0;
319 HFS_I(inode)->rsrc_inode = NULL;
39f8d472 320 mutex_init(&HFS_I(inode)->extents_lock);
1da177e4 321 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
9717a91b 322 spin_lock_init(&HFS_I(inode)->open_dir_lock);
1da177e4
LT		 323
324 /* Initialize the inode */
325 inode->i_uid = hsb->s_uid;
326 inode->i_gid = hsb->s_gid;
bfe86848 327 set_nlink(inode, 1);
1da177e4
LT		 328
329 if (idata->key)
330 HFS_I(inode)->cat_key = *idata->key;
331 else
332 HFS_I(inode)->flags |= HFS_FLG_RSRC;
333 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
334
335 rec = idata->rec;
336 switch (rec->type) {
337 case HFS_CDR_FIL:
338 if (!HFS_IS_RSRC(inode)) {
339 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
340 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
341 } else {
342 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
343 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
344 }
345
346 inode->i_ino = be32_to_cpu(rec->file.FlNum);
347 inode->i_mode = S_IRUGO | S_IXUGO;
348 if (!(rec->file.Flags & HFS_FIL_LOCK))
349 inode->i_mode |= S_IWUGO;
350 inode->i_mode &= ~hsb->s_file_umask;
351 inode->i_mode |= S_IFREG;
352 inode->i_ctime = inode->i_atime = inode->i_mtime =
353 hfs_m_to_utime(rec->file.MdDat);
354 inode->i_op = &hfs_file_inode_operations;
355 inode->i_fop = &hfs_file_operations;
356 inode->i_mapping->a_ops = &hfs_aops;
357 break;
358 case HFS_CDR_DIR:
359 inode->i_ino = be32_to_cpu(rec->dir.DirID);
360 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
361 HFS_I(inode)->fs_blocks = 0;
362 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
363 inode->i_ctime = inode->i_atime = inode->i_mtime =
364 hfs_m_to_utime(rec->dir.MdDat);
365 inode->i_op = &hfs_dir_inode_operations;
366 inode->i_fop = &hfs_dir_operations;
367 break;
368 default:
369 make_bad_inode(inode);
370 }
371 return 0;
372}
373
374/*
375 * __hfs_iget()
376 *
377 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
378 * the catalog B-tree and the 'type' of the desired file return the
379 * inode for that file/directory or NULL. Note that 'type' indicates
380 * whether we want the actual file or directory, or the corresponding
381 * metadata (AppleDouble header file or CAP metadata file).
382 */
383struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
384{
385 struct hfs_iget_data data = { key, rec };
386 struct inode *inode;
387 u32 cnid;
388
389 switch (rec->type) {
390 case HFS_CDR_DIR:
391 cnid = be32_to_cpu(rec->dir.DirID);
392 break;
393 case HFS_CDR_FIL:
394 cnid = be32_to_cpu(rec->file.FlNum);
395 break;
396 default:
397 return NULL;
398 }
399 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
400 if (inode && (inode->i_state & I_NEW))
401 unlock_new_inode(inode);
402 return inode;
403}
404
405void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
406 __be32 *log_size, __be32 *phys_size)
407{
408 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
409
410 if (log_size)
411 *log_size = cpu_to_be32(inode->i_size);
412 if (phys_size)
413 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
414 HFS_SB(inode->i_sb)->alloc_blksz);
415}
416
a9185b41 417int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1da177e4
LT		 418{
419 struct inode *main_inode = inode;
420 struct hfs_find_data fd;
421 hfs_cat_rec rec;
9509f178 422 int res;
1da177e4 423
c2b3e1f7 424 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
9509f178
AK		 425 res = hfs_ext_write_extent(inode);
426 if (res)
427 return res;
1da177e4
LT		 428
429 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
430 switch (inode->i_ino) {
431 case HFS_ROOT_CNID:
432 break;
433 case HFS_EXT_CNID:
434 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
435 return 0;
436 case HFS_CAT_CNID:
437 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
438 return 0;
439 default:
440 BUG();
441 return -EIO;
442 }
443 }
444
445 if (HFS_IS_RSRC(inode))
446 main_inode = HFS_I(inode)->rsrc_inode;
447
448 if (!main_inode->i_nlink)
449 return 0;
450
451 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
452 /* panic? */
453 return -EIO;
454
455 fd.search_key->cat = HFS_I(main_inode)->cat_key;
456 if (hfs_brec_find(&fd))
457 /* panic? */
458 goto out;
459
460 if (S_ISDIR(main_inode->i_mode)) {
461 if (fd.entrylength < sizeof(struct hfs_cat_dir))
462 /* panic? */;
463 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
464 sizeof(struct hfs_cat_dir));
465 if (rec.type != HFS_CDR_DIR ||
466 be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
467 }
468
469 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
470 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
471
472 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
473 sizeof(struct hfs_cat_dir));
474 } else if (HFS_IS_RSRC(inode)) {
475 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
476 sizeof(struct hfs_cat_file));
477 hfs_inode_write_fork(inode, rec.file.RExtRec,
478 &rec.file.RLgLen, &rec.file.RPyLen);
479 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
480 sizeof(struct hfs_cat_file));
481 } else {
482 if (fd.entrylength < sizeof(struct hfs_cat_file))
483 /* panic? */;
484 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
485 sizeof(struct hfs_cat_file));
486 if (rec.type != HFS_CDR_FIL ||
487 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
488 }
489
490 if (inode->i_mode & S_IWUSR)
491 rec.file.Flags &= ~HFS_FIL_LOCK;
492 else
493 rec.file.Flags |= HFS_FIL_LOCK;
494 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
495 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
496
497 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
498 sizeof(struct hfs_cat_file));
499 }
500out:
501 hfs_find_exit(&fd);
502 return 0;
503}
504
505static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
00cd8dd3 506 unsigned int flags)
1da177e4
LT		 507{
508 struct inode *inode = NULL;
509 hfs_cat_rec rec;
510 struct hfs_find_data fd;
511 int res;
512
513 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
514 goto out;
515
516 inode = HFS_I(dir)->rsrc_inode;
517 if (inode)
518 goto out;
519
520 inode = new_inode(dir->i_sb);
521 if (!inode)
522 return ERR_PTR(-ENOMEM);
523
9509f178
AK		 524 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
525 if (res) {
526 iput(inode);
527 return ERR_PTR(res);
528 }
1da177e4
LT		 529 fd.search_key->cat = HFS_I(dir)->cat_key;
530 res = hfs_brec_read(&fd, &rec, sizeof(rec));
531 if (!res) {
532 struct hfs_iget_data idata = { NULL, &rec };
533 hfs_read_inode(inode, &idata);
534 }
535 hfs_find_exit(&fd);
536 if (res) {
537 iput(inode);
538 return ERR_PTR(res);
539 }
540 HFS_I(inode)->rsrc_inode = dir;
541 HFS_I(dir)->rsrc_inode = inode;
542 igrab(dir);
89b0fc38 543 hlist_add_fake(&inode->i_hash);
1da177e4
LT		 544 mark_inode_dirty(inode);
545out:
546 d_add(dentry, inode);
547 return NULL;
548}
549
b57922d9 550void hfs_evict_inode(struct inode *inode)
1da177e4 551{
91b0abe3 552 truncate_inode_pages_final(&inode->i_data);
dbd5768f 553 clear_inode(inode);
1da177e4
LT		 554 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
555 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
556 iput(HFS_I(inode)->rsrc_inode);
557 }
558}
559
1da177e4
LT		 560static int hfs_file_open(struct inode *inode, struct file *file)
561{
562 if (HFS_IS_RSRC(inode))
563 inode = HFS_I(inode)->rsrc_inode;
1da177e4
LT		 564 atomic_inc(&HFS_I(inode)->opencnt);
565 return 0;
566}
567
568static int hfs_file_release(struct inode *inode, struct file *file)
569{
570 //struct super_block *sb = inode->i_sb;
571
572 if (HFS_IS_RSRC(inode))
573 inode = HFS_I(inode)->rsrc_inode;
1da177e4 574 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
5955102c 575 inode_lock(inode);
1da177e4
LT		 576 hfs_file_truncate(inode);
577 //if (inode->i_flags & S_DEAD) {
578 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
579 // hfs_delete_inode(inode);
580 //}
5955102c 581 inode_unlock(inode);
1da177e4
LT		 582 }
583 return 0;
584}
585
586/*
587 * hfs_notify_change()
588 *
589 * Based very closely on fs/msdos/inode.c by Werner Almesberger
590 *
591 * This is the notify_change() field in the super_operations structure
592 * for HFS file systems. The purpose is to take that changes made to
593 * an inode and apply then in a filesystem-dependent manner. In this
594 * case the process has a few of tasks to do:
595 * 1) prevent changes to the i_uid and i_gid fields.
596 * 2) map file permissions to the closest allowable permissions
597 * 3) Since multiple Linux files can share the same on-disk inode under
598 * HFS (for instance the data and resource forks of a file) a change
599 * to permissions must be applied to all other in-core inodes which
600 * correspond to the same HFS file.
601 */
602
603int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
604{
2b0143b5 605 struct inode *inode = d_inode(dentry);
1da177e4
LT		 606 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
607 int error;
608
31051c85 609 error = setattr_prepare(dentry, attr); /* basic permission checks */
1da177e4
LT		 610 if (error)
611 return error;
612
613 /* no uig/gid changes and limit which mode bits can be set */
614 if (((attr->ia_valid & ATTR_UID) &&
43b5e4cc 615 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
1da177e4 616 ((attr->ia_valid & ATTR_GID) &&
43b5e4cc 617 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
1da177e4
LT		 618 ((attr->ia_valid & ATTR_MODE) &&
619 ((S_ISDIR(inode->i_mode) &&
620 (attr->ia_mode != inode->i_mode)) ||
621 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
622 return hsb->s_quiet ? 0 : error;
623 }
624
625 if (attr->ia_valid & ATTR_MODE) {
626 /* Only the 'w' bits can ever change and only all together. */
627 if (attr->ia_mode & S_IWUSR)
628 attr->ia_mode = inode->i_mode | S_IWUGO;
629 else
630 attr->ia_mode = inode->i_mode & ~S_IWUGO;
631 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
632 }
1da177e4 633
1025774c
CH		 634 if ((attr->ia_valid & ATTR_SIZE) &&
635 attr->ia_size != i_size_read(inode)) {
562c72aa
CH		 636 inode_dio_wait(inode);
637
c8cf464b 638 error = inode_newsize_ok(inode, attr->ia_size);
1025774c
CH		 639 if (error)
640 return error;
c8cf464b
MS		 641
642 truncate_setsize(inode, attr->ia_size);
643 hfs_file_truncate(inode);
1025774c
CH		 644 }
645
646 setattr_copy(inode, attr);
647 mark_inode_dirty(inode);
1da177e4
LT		 648 return 0;
649}
650
02c24a82
JB		 651static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
652 int datasync)
b5fc510c
AV		 653{
654 struct inode *inode = filp->f_mapping->host;
655 struct super_block * sb;
656 int ret, err;
657
02c24a82
JB		 658 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
659 if (ret)
660 return ret;
5955102c 661 inode_lock(inode);
02c24a82 662
b5fc510c
AV		 663 /* sync the inode to buffers */
664 ret = write_inode_now(inode, 0);
665
666 /* sync the superblock to buffers */
667 sb = inode->i_sb;
43829731 668 flush_delayed_work(&HFS_SB(sb)->mdb_work);
b5fc510c
AV		 669 /* .. finally sync the buffers to disk */
670 err = sync_blockdev(sb->s_bdev);
671 if (!ret)
672 ret = err;
5955102c 673 inode_unlock(inode);
b5fc510c
AV		 674 return ret;
675}
1da177e4 676
4b6f5d20 677static const struct file_operations hfs_file_operations = {
1da177e4 678 .llseek = generic_file_llseek,
aad4f8bb 679 .read_iter = generic_file_read_iter,
8174202b 680 .write_iter = generic_file_write_iter,
1da177e4 681 .mmap = generic_file_mmap,
5ffc4ef4 682 .splice_read = generic_file_splice_read,
b5fc510c 683 .fsync = hfs_file_fsync,
1da177e4
LT		 684 .open = hfs_file_open,
685 .release = hfs_file_release,
686};
687
92e1d5be 688static const struct inode_operations hfs_file_inode_operations = {
1da177e4 689 .lookup = hfs_file_lookup,
1da177e4 690 .setattr = hfs_inode_setattr,
b8020eff 691 .listxattr = generic_listxattr,
1da177e4 692};
Linux 6.x block layer and io_uring tree(s)