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wrappers for ->i_mutex access
[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>
1da177e4
LT		 18
19#include "hfs_fs.h"
20#include "btree.h"
21
4b6f5d20 22static const struct file_operations hfs_file_operations;
92e1d5be 23static const struct inode_operations hfs_file_inode_operations;
1da177e4
LT		 24
25/*================ Variable-like macros ================*/
26
27#define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO)
28
29static int hfs_writepage(struct page *page, struct writeback_control *wbc)
30{
31 return block_write_full_page(page, hfs_get_block, wbc);
32}
33
34static int hfs_readpage(struct file *file, struct page *page)
35{
36 return block_read_full_page(page, hfs_get_block);
37}
38
c8cf464b
MS		 39static void hfs_write_failed(struct address_space *mapping, loff_t to)
40{
41 struct inode *inode = mapping->host;
42
43 if (to > inode->i_size) {
7caef267 44 truncate_pagecache(inode, inode->i_size);
c8cf464b
MS		 45 hfs_file_truncate(inode);
46 }
47}
48
7903d9ee
NP		 49static int hfs_write_begin(struct file *file, struct address_space *mapping,
50 loff_t pos, unsigned len, unsigned flags,
51 struct page **pagep, void **fsdata)
1da177e4 52{
282dc178
CH		 53 int ret;
54
7903d9ee 55 *pagep = NULL;
282dc178 56 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
7903d9ee
NP		 57 hfs_get_block,
58 &HFS_I(mapping->host)->phys_size);
c8cf464b
MS		 59 if (unlikely(ret))
60 hfs_write_failed(mapping, pos + len);
282dc178
CH		 61
62 return ret;
1da177e4
LT		 63}
64
65static sector_t hfs_bmap(struct address_space *mapping, sector_t block)
66{
67 return generic_block_bmap(mapping, block, hfs_get_block);
68}
69
27496a8c 70static int hfs_releasepage(struct page *page, gfp_t mask)
1da177e4
LT		 71{
72 struct inode *inode = page->mapping->host;
73 struct super_block *sb = inode->i_sb;
74 struct hfs_btree *tree;
75 struct hfs_bnode *node;
76 u32 nidx;
77 int i, res = 1;
78
79 switch (inode->i_ino) {
80 case HFS_EXT_CNID:
81 tree = HFS_SB(sb)->ext_tree;
82 break;
83 case HFS_CAT_CNID:
84 tree = HFS_SB(sb)->cat_tree;
85 break;
86 default:
87 BUG();
88 return 0;
89 }
eb2e5f45
DA		 90
91 if (!tree)
92 return 0;
93
1da177e4
LT		 94 if (tree->node_size >= PAGE_CACHE_SIZE) {
95 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
96 spin_lock(&tree->hash_lock);
97 node = hfs_bnode_findhash(tree, nidx);
98 if (!node)
99 ;
100 else if (atomic_read(&node->refcnt))
101 res = 0;
102 if (res && node) {
103 hfs_bnode_unhash(node);
104 hfs_bnode_free(node);
105 }
106 spin_unlock(&tree->hash_lock);
107 } else {
108 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
109 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
110 spin_lock(&tree->hash_lock);
111 do {
112 node = hfs_bnode_findhash(tree, nidx++);
113 if (!node)
114 continue;
115 if (atomic_read(&node->refcnt)) {
116 res = 0;
117 break;
118 }
119 hfs_bnode_unhash(node);
120 hfs_bnode_free(node);
121 } while (--i && nidx < tree->node_count);
122 spin_unlock(&tree->hash_lock);
123 }
1da177e4
LT		 124 return res ? try_to_free_buffers(page) : 0;
125}
126
22c6186e
OS		 127static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
128 loff_t offset)
1da177e4
LT		 129{
130 struct file *file = iocb->ki_filp;
c8cf464b 131 struct address_space *mapping = file->f_mapping;
496ad9aa 132 struct inode *inode = file_inode(file)->i_mapping->host;
a6cbcd4a 133 size_t count = iov_iter_count(iter);
eafdc7d1 134 ssize_t ret;
1da177e4 135
17f8c842 136 ret = blockdev_direct_IO(iocb, inode, iter, offset, 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);
a6cbcd4a 144 loff_t end = offset + 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 */
e021d7b7 181struct inode *hfs_new_inode(struct inode *dir, 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);
328b9227 190 hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name);
1da177e4
LT		 191 inode->i_ino = HFS_SB(sb)->next_id++;
192 inode->i_mode = mode;
94c9a5ee
DH		 193 inode->i_uid = current_fsuid();
194 inode->i_gid = current_fsgid();
bfe86848 195 set_nlink(inode, 1);
1da177e4 196 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
1da177e4
LT		 197 HFS_I(inode)->flags = 0;
198 HFS_I(inode)->rsrc_inode = NULL;
199 HFS_I(inode)->fs_blocks = 0;
200 if (S_ISDIR(mode)) {
201 inode->i_size = 2;
202 HFS_SB(sb)->folder_count++;
203 if (dir->i_ino == HFS_ROOT_CNID)
204 HFS_SB(sb)->root_dirs++;
205 inode->i_op = &hfs_dir_inode_operations;
206 inode->i_fop = &hfs_dir_operations;
207 inode->i_mode |= S_IRWXUGO;
208 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask;
209 } else if (S_ISREG(mode)) {
210 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
211 HFS_SB(sb)->file_count++;
212 if (dir->i_ino == HFS_ROOT_CNID)
213 HFS_SB(sb)->root_files++;
214 inode->i_op = &hfs_file_inode_operations;
215 inode->i_fop = &hfs_file_operations;
216 inode->i_mapping->a_ops = &hfs_aops;
217 inode->i_mode |= S_IRUGO|S_IXUGO;
218 if (mode & S_IWUSR)
219 inode->i_mode |= S_IWUGO;
220 inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask;
221 HFS_I(inode)->phys_size = 0;
222 HFS_I(inode)->alloc_blocks = 0;
223 HFS_I(inode)->first_blocks = 0;
224 HFS_I(inode)->cached_start = 0;
225 HFS_I(inode)->cached_blocks = 0;
226 memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec));
227 memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec));
228 }
229 insert_inode_hash(inode);
230 mark_inode_dirty(inode);
231 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
5687b578 232 hfs_mark_mdb_dirty(sb);
1da177e4
LT		 233
234 return inode;
235}
236
237void hfs_delete_inode(struct inode *inode)
238{
239 struct super_block *sb = inode->i_sb;
240
c2b3e1f7 241 hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino);
1da177e4
LT		 242 if (S_ISDIR(inode->i_mode)) {
243 HFS_SB(sb)->folder_count--;
244 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
245 HFS_SB(sb)->root_dirs--;
246 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
5687b578 247 hfs_mark_mdb_dirty(sb);
1da177e4
LT		 248 return;
249 }
250 HFS_SB(sb)->file_count--;
251 if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID))
252 HFS_SB(sb)->root_files--;
253 if (S_ISREG(inode->i_mode)) {
254 if (!inode->i_nlink) {
255 inode->i_size = 0;
256 hfs_file_truncate(inode);
257 }
258 }
259 set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags);
5687b578 260 hfs_mark_mdb_dirty(sb);
1da177e4
LT		 261}
262
263void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
264 __be32 __log_size, __be32 phys_size, u32 clump_size)
265{
266 struct super_block *sb = inode->i_sb;
267 u32 log_size = be32_to_cpu(__log_size);
268 u16 count;
269 int i;
270
271 memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec));
272 for (count = 0, i = 0; i < 3; i++)
273 count += be16_to_cpu(ext[i].count);
274 HFS_I(inode)->first_blocks = count;
275
276 inode->i_size = HFS_I(inode)->phys_size = log_size;
277 HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
278 inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits);
279 HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) /
280 HFS_SB(sb)->alloc_blksz;
281 HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz;
282 if (!HFS_I(inode)->clump_blocks)
283 HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks;
284}
285
286struct hfs_iget_data {
287 struct hfs_cat_key *key;
288 hfs_cat_rec *rec;
289};
290
291static int hfs_test_inode(struct inode *inode, void *data)
292{
293 struct hfs_iget_data *idata = data;
294 hfs_cat_rec *rec;
295
296 rec = idata->rec;
297 switch (rec->type) {
298 case HFS_CDR_DIR:
299 return inode->i_ino == be32_to_cpu(rec->dir.DirID);
300 case HFS_CDR_FIL:
301 return inode->i_ino == be32_to_cpu(rec->file.FlNum);
302 default:
303 BUG();
304 return 1;
305 }
306}
307
308/*
309 * hfs_read_inode
310 */
311static int hfs_read_inode(struct inode *inode, void *data)
312{
313 struct hfs_iget_data *idata = data;
314 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
315 hfs_cat_rec *rec;
316
317 HFS_I(inode)->flags = 0;
318 HFS_I(inode)->rsrc_inode = NULL;
39f8d472 319 mutex_init(&HFS_I(inode)->extents_lock);
1da177e4
LT		 320 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
321
322 /* Initialize the inode */
323 inode->i_uid = hsb->s_uid;
324 inode->i_gid = hsb->s_gid;
bfe86848 325 set_nlink(inode, 1);
1da177e4
LT		 326
327 if (idata->key)
328 HFS_I(inode)->cat_key = *idata->key;
329 else
330 HFS_I(inode)->flags |= HFS_FLG_RSRC;
331 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
332
333 rec = idata->rec;
334 switch (rec->type) {
335 case HFS_CDR_FIL:
336 if (!HFS_IS_RSRC(inode)) {
337 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
338 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
339 } else {
340 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
341 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
342 }
343
344 inode->i_ino = be32_to_cpu(rec->file.FlNum);
345 inode->i_mode = S_IRUGO | S_IXUGO;
346 if (!(rec->file.Flags & HFS_FIL_LOCK))
347 inode->i_mode |= S_IWUGO;
348 inode->i_mode &= ~hsb->s_file_umask;
349 inode->i_mode |= S_IFREG;
350 inode->i_ctime = inode->i_atime = inode->i_mtime =
351 hfs_m_to_utime(rec->file.MdDat);
352 inode->i_op = &hfs_file_inode_operations;
353 inode->i_fop = &hfs_file_operations;
354 inode->i_mapping->a_ops = &hfs_aops;
355 break;
356 case HFS_CDR_DIR:
357 inode->i_ino = be32_to_cpu(rec->dir.DirID);
358 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
359 HFS_I(inode)->fs_blocks = 0;
360 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
361 inode->i_ctime = inode->i_atime = inode->i_mtime =
362 hfs_m_to_utime(rec->dir.MdDat);
363 inode->i_op = &hfs_dir_inode_operations;
364 inode->i_fop = &hfs_dir_operations;
365 break;
366 default:
367 make_bad_inode(inode);
368 }
369 return 0;
370}
371
372/*
373 * __hfs_iget()
374 *
375 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
376 * the catalog B-tree and the 'type' of the desired file return the
377 * inode for that file/directory or NULL. Note that 'type' indicates
378 * whether we want the actual file or directory, or the corresponding
379 * metadata (AppleDouble header file or CAP metadata file).
380 */
381struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
382{
383 struct hfs_iget_data data = { key, rec };
384 struct inode *inode;
385 u32 cnid;
386
387 switch (rec->type) {
388 case HFS_CDR_DIR:
389 cnid = be32_to_cpu(rec->dir.DirID);
390 break;
391 case HFS_CDR_FIL:
392 cnid = be32_to_cpu(rec->file.FlNum);
393 break;
394 default:
395 return NULL;
396 }
397 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
398 if (inode && (inode->i_state & I_NEW))
399 unlock_new_inode(inode);
400 return inode;
401}
402
403void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
404 __be32 *log_size, __be32 *phys_size)
405{
406 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
407
408 if (log_size)
409 *log_size = cpu_to_be32(inode->i_size);
410 if (phys_size)
411 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
412 HFS_SB(inode->i_sb)->alloc_blksz);
413}
414
a9185b41 415int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1da177e4
LT		 416{
417 struct inode *main_inode = inode;
418 struct hfs_find_data fd;
419 hfs_cat_rec rec;
9509f178 420 int res;
1da177e4 421
c2b3e1f7 422 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
9509f178
AK		 423 res = hfs_ext_write_extent(inode);
424 if (res)
425 return res;
1da177e4
LT		 426
427 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
428 switch (inode->i_ino) {
429 case HFS_ROOT_CNID:
430 break;
431 case HFS_EXT_CNID:
432 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
433 return 0;
434 case HFS_CAT_CNID:
435 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
436 return 0;
437 default:
438 BUG();
439 return -EIO;
440 }
441 }
442
443 if (HFS_IS_RSRC(inode))
444 main_inode = HFS_I(inode)->rsrc_inode;
445
446 if (!main_inode->i_nlink)
447 return 0;
448
449 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
450 /* panic? */
451 return -EIO;
452
453 fd.search_key->cat = HFS_I(main_inode)->cat_key;
454 if (hfs_brec_find(&fd))
455 /* panic? */
456 goto out;
457
458 if (S_ISDIR(main_inode->i_mode)) {
459 if (fd.entrylength < sizeof(struct hfs_cat_dir))
460 /* panic? */;
461 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
462 sizeof(struct hfs_cat_dir));
463 if (rec.type != HFS_CDR_DIR ||
464 be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
465 }
466
467 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
468 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
469
470 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
471 sizeof(struct hfs_cat_dir));
472 } else if (HFS_IS_RSRC(inode)) {
473 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
474 sizeof(struct hfs_cat_file));
475 hfs_inode_write_fork(inode, rec.file.RExtRec,
476 &rec.file.RLgLen, &rec.file.RPyLen);
477 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
478 sizeof(struct hfs_cat_file));
479 } else {
480 if (fd.entrylength < sizeof(struct hfs_cat_file))
481 /* panic? */;
482 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
483 sizeof(struct hfs_cat_file));
484 if (rec.type != HFS_CDR_FIL ||
485 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
486 }
487
488 if (inode->i_mode & S_IWUSR)
489 rec.file.Flags &= ~HFS_FIL_LOCK;
490 else
491 rec.file.Flags |= HFS_FIL_LOCK;
492 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
493 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
494
495 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
496 sizeof(struct hfs_cat_file));
497 }
498out:
499 hfs_find_exit(&fd);
500 return 0;
501}
502
503static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
00cd8dd3 504 unsigned int flags)
1da177e4
LT		 505{
506 struct inode *inode = NULL;
507 hfs_cat_rec rec;
508 struct hfs_find_data fd;
509 int res;
510
511 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
512 goto out;
513
514 inode = HFS_I(dir)->rsrc_inode;
515 if (inode)
516 goto out;
517
518 inode = new_inode(dir->i_sb);
519 if (!inode)
520 return ERR_PTR(-ENOMEM);
521
9509f178
AK		 522 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
523 if (res) {
524 iput(inode);
525 return ERR_PTR(res);
526 }
1da177e4
LT		 527 fd.search_key->cat = HFS_I(dir)->cat_key;
528 res = hfs_brec_read(&fd, &rec, sizeof(rec));
529 if (!res) {
530 struct hfs_iget_data idata = { NULL, &rec };
531 hfs_read_inode(inode, &idata);
532 }
533 hfs_find_exit(&fd);
534 if (res) {
535 iput(inode);
536 return ERR_PTR(res);
537 }
538 HFS_I(inode)->rsrc_inode = dir;
539 HFS_I(dir)->rsrc_inode = inode;
540 igrab(dir);
89b0fc38 541 hlist_add_fake(&inode->i_hash);
1da177e4
LT		 542 mark_inode_dirty(inode);
543out:
544 d_add(dentry, inode);
545 return NULL;
546}
547
b57922d9 548void hfs_evict_inode(struct inode *inode)
1da177e4 549{
91b0abe3 550 truncate_inode_pages_final(&inode->i_data);
dbd5768f 551 clear_inode(inode);
1da177e4
LT		 552 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
553 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
554 iput(HFS_I(inode)->rsrc_inode);
555 }
556}
557
1da177e4
LT		 558static int hfs_file_open(struct inode *inode, struct file *file)
559{
560 if (HFS_IS_RSRC(inode))
561 inode = HFS_I(inode)->rsrc_inode;
1da177e4
LT		 562 atomic_inc(&HFS_I(inode)->opencnt);
563 return 0;
564}
565
566static int hfs_file_release(struct inode *inode, struct file *file)
567{
568 //struct super_block *sb = inode->i_sb;
569
570 if (HFS_IS_RSRC(inode))
571 inode = HFS_I(inode)->rsrc_inode;
1da177e4 572 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
5955102c 573 inode_lock(inode);
1da177e4
LT		 574 hfs_file_truncate(inode);
575 //if (inode->i_flags & S_DEAD) {
576 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
577 // hfs_delete_inode(inode);
578 //}
5955102c 579 inode_unlock(inode);
1da177e4
LT		 580 }
581 return 0;
582}
583
584/*
585 * hfs_notify_change()
586 *
587 * Based very closely on fs/msdos/inode.c by Werner Almesberger
588 *
589 * This is the notify_change() field in the super_operations structure
590 * for HFS file systems. The purpose is to take that changes made to
591 * an inode and apply then in a filesystem-dependent manner. In this
592 * case the process has a few of tasks to do:
593 * 1) prevent changes to the i_uid and i_gid fields.
594 * 2) map file permissions to the closest allowable permissions
595 * 3) Since multiple Linux files can share the same on-disk inode under
596 * HFS (for instance the data and resource forks of a file) a change
597 * to permissions must be applied to all other in-core inodes which
598 * correspond to the same HFS file.
599 */
600
601int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
602{
2b0143b5 603 struct inode *inode = d_inode(dentry);
1da177e4
LT		 604 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
605 int error;
606
607 error = inode_change_ok(inode, attr); /* basic permission checks */
608 if (error)
609 return error;
610
611 /* no uig/gid changes and limit which mode bits can be set */
612 if (((attr->ia_valid & ATTR_UID) &&
43b5e4cc 613 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
1da177e4 614 ((attr->ia_valid & ATTR_GID) &&
43b5e4cc 615 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
1da177e4
LT		 616 ((attr->ia_valid & ATTR_MODE) &&
617 ((S_ISDIR(inode->i_mode) &&
618 (attr->ia_mode != inode->i_mode)) ||
619 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
620 return hsb->s_quiet ? 0 : error;
621 }
622
623 if (attr->ia_valid & ATTR_MODE) {
624 /* Only the 'w' bits can ever change and only all together. */
625 if (attr->ia_mode & S_IWUSR)
626 attr->ia_mode = inode->i_mode | S_IWUGO;
627 else
628 attr->ia_mode = inode->i_mode & ~S_IWUGO;
629 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
630 }
1da177e4 631
1025774c
CH		 632 if ((attr->ia_valid & ATTR_SIZE) &&
633 attr->ia_size != i_size_read(inode)) {
562c72aa
CH		 634 inode_dio_wait(inode);
635
c8cf464b 636 error = inode_newsize_ok(inode, attr->ia_size);
1025774c
CH		 637 if (error)
638 return error;
c8cf464b
MS		 639
640 truncate_setsize(inode, attr->ia_size);
641 hfs_file_truncate(inode);
1025774c
CH		 642 }
643
644 setattr_copy(inode, attr);
645 mark_inode_dirty(inode);
1da177e4
LT		 646 return 0;
647}
648
02c24a82
JB		 649static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
650 int datasync)
b5fc510c
AV		 651{
652 struct inode *inode = filp->f_mapping->host;
653 struct super_block * sb;
654 int ret, err;
655
02c24a82
JB		 656 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
657 if (ret)
658 return ret;
5955102c 659 inode_lock(inode);
02c24a82 660
b5fc510c
AV		 661 /* sync the inode to buffers */
662 ret = write_inode_now(inode, 0);
663
664 /* sync the superblock to buffers */
665 sb = inode->i_sb;
43829731 666 flush_delayed_work(&HFS_SB(sb)->mdb_work);
b5fc510c
AV		 667 /* .. finally sync the buffers to disk */
668 err = sync_blockdev(sb->s_bdev);
669 if (!ret)
670 ret = err;
5955102c 671 inode_unlock(inode);
b5fc510c
AV		 672 return ret;
673}
1da177e4 674
4b6f5d20 675static const struct file_operations hfs_file_operations = {
1da177e4 676 .llseek = generic_file_llseek,
aad4f8bb 677 .read_iter = generic_file_read_iter,
8174202b 678 .write_iter = generic_file_write_iter,
1da177e4 679 .mmap = generic_file_mmap,
5ffc4ef4 680 .splice_read = generic_file_splice_read,
b5fc510c 681 .fsync = hfs_file_fsync,
1da177e4
LT		 682 .open = hfs_file_open,
683 .release = hfs_file_release,
684};
685
92e1d5be 686static const struct inode_operations hfs_file_inode_operations = {
1da177e4 687 .lookup = hfs_file_lookup,
1da177e4 688 .setattr = hfs_inode_setattr,
1da177e4
LT		 689 .setxattr = hfs_setxattr,
690 .getxattr = hfs_getxattr,
691 .listxattr = hfs_listxattr,
692};
Linux 6.x block layer and io_uring tree(s)