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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[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
09cbfeaf
KS		 94 if (tree->node_size >= PAGE_SIZE) {
95 nidx = page->index >> (tree->node_size_shift - PAGE_SHIFT);
1da177e4
LT		 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 {
09cbfeaf
KS		 108 nidx = page->index << (PAGE_SHIFT - tree->node_size_shift);
109 i = 1 << (PAGE_SHIFT - tree->node_size_shift);
1da177e4
LT		 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
c8b8e32d 127static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
1da177e4
LT		 128{
129 struct file *file = iocb->ki_filp;
c8cf464b 130 struct address_space *mapping = file->f_mapping;
496ad9aa 131 struct inode *inode = file_inode(file)->i_mapping->host;
a6cbcd4a 132 size_t count = iov_iter_count(iter);
eafdc7d1 133 ssize_t ret;
1da177e4 134
c8b8e32d 135 ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block);
eafdc7d1
CH		 136
137 /*
138 * In case of error extending write may have instantiated a few
139 * blocks outside i_size. Trim these off again.
140 */
6f673763 141 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
eafdc7d1 142 loff_t isize = i_size_read(inode);
c8b8e32d 143 loff_t end = iocb->ki_pos + count;
eafdc7d1
CH		 144
145 if (end > isize)
c8cf464b 146 hfs_write_failed(mapping, end);
eafdc7d1
CH		 147 }
148
149 return ret;
1da177e4
LT		 150}
151
152static int hfs_writepages(struct address_space *mapping,
153 struct writeback_control *wbc)
154{
155 return mpage_writepages(mapping, wbc, hfs_get_block);
156}
157
f5e54d6e 158const struct address_space_operations hfs_btree_aops = {
1da177e4
LT		 159 .readpage = hfs_readpage,
160 .writepage = hfs_writepage,
7903d9ee
NP		 161 .write_begin = hfs_write_begin,
162 .write_end = generic_write_end,
1da177e4
LT		 163 .bmap = hfs_bmap,
164 .releasepage = hfs_releasepage,
165};
166
f5e54d6e 167const struct address_space_operations hfs_aops = {
1da177e4
LT		 168 .readpage = hfs_readpage,
169 .writepage = hfs_writepage,
7903d9ee
NP		 170 .write_begin = hfs_write_begin,
171 .write_end = generic_write_end,
1da177e4
LT		 172 .bmap = hfs_bmap,
173 .direct_IO = hfs_direct_IO,
174 .writepages = hfs_writepages,
175};
176
177/*
178 * hfs_new_inode
179 */
e021d7b7 180struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, umode_t mode)
1da177e4
LT		 181{
182 struct super_block *sb = dir->i_sb;
183 struct inode *inode = new_inode(sb);
184 if (!inode)
185 return NULL;
186
39f8d472 187 mutex_init(&HFS_I(inode)->extents_lock);
1da177e4 188 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
9717a91b 189 spin_lock_init(&HFS_I(inode)->open_dir_lock);
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 320 INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list);
9717a91b 321 spin_lock_init(&HFS_I(inode)->open_dir_lock);
1da177e4
LT		 322
323 /* Initialize the inode */
324 inode->i_uid = hsb->s_uid;
325 inode->i_gid = hsb->s_gid;
bfe86848 326 set_nlink(inode, 1);
1da177e4
LT		 327
328 if (idata->key)
329 HFS_I(inode)->cat_key = *idata->key;
330 else
331 HFS_I(inode)->flags |= HFS_FLG_RSRC;
332 HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60;
333
334 rec = idata->rec;
335 switch (rec->type) {
336 case HFS_CDR_FIL:
337 if (!HFS_IS_RSRC(inode)) {
338 hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen,
339 rec->file.PyLen, be16_to_cpu(rec->file.ClpSize));
340 } else {
341 hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen,
342 rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize));
343 }
344
345 inode->i_ino = be32_to_cpu(rec->file.FlNum);
346 inode->i_mode = S_IRUGO | S_IXUGO;
347 if (!(rec->file.Flags & HFS_FIL_LOCK))
348 inode->i_mode |= S_IWUGO;
349 inode->i_mode &= ~hsb->s_file_umask;
350 inode->i_mode |= S_IFREG;
351 inode->i_ctime = inode->i_atime = inode->i_mtime =
352 hfs_m_to_utime(rec->file.MdDat);
353 inode->i_op = &hfs_file_inode_operations;
354 inode->i_fop = &hfs_file_operations;
355 inode->i_mapping->a_ops = &hfs_aops;
356 break;
357 case HFS_CDR_DIR:
358 inode->i_ino = be32_to_cpu(rec->dir.DirID);
359 inode->i_size = be16_to_cpu(rec->dir.Val) + 2;
360 HFS_I(inode)->fs_blocks = 0;
361 inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask);
362 inode->i_ctime = inode->i_atime = inode->i_mtime =
363 hfs_m_to_utime(rec->dir.MdDat);
364 inode->i_op = &hfs_dir_inode_operations;
365 inode->i_fop = &hfs_dir_operations;
366 break;
367 default:
368 make_bad_inode(inode);
369 }
370 return 0;
371}
372
373/*
374 * __hfs_iget()
375 *
376 * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in
377 * the catalog B-tree and the 'type' of the desired file return the
378 * inode for that file/directory or NULL. Note that 'type' indicates
379 * whether we want the actual file or directory, or the corresponding
380 * metadata (AppleDouble header file or CAP metadata file).
381 */
382struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec)
383{
384 struct hfs_iget_data data = { key, rec };
385 struct inode *inode;
386 u32 cnid;
387
388 switch (rec->type) {
389 case HFS_CDR_DIR:
390 cnid = be32_to_cpu(rec->dir.DirID);
391 break;
392 case HFS_CDR_FIL:
393 cnid = be32_to_cpu(rec->file.FlNum);
394 break;
395 default:
396 return NULL;
397 }
398 inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data);
399 if (inode && (inode->i_state & I_NEW))
400 unlock_new_inode(inode);
401 return inode;
402}
403
404void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext,
405 __be32 *log_size, __be32 *phys_size)
406{
407 memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec));
408
409 if (log_size)
410 *log_size = cpu_to_be32(inode->i_size);
411 if (phys_size)
412 *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks *
413 HFS_SB(inode->i_sb)->alloc_blksz);
414}
415
a9185b41 416int hfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1da177e4
LT		 417{
418 struct inode *main_inode = inode;
419 struct hfs_find_data fd;
420 hfs_cat_rec rec;
9509f178 421 int res;
1da177e4 422
c2b3e1f7 423 hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino);
9509f178
AK		 424 res = hfs_ext_write_extent(inode);
425 if (res)
426 return res;
1da177e4
LT		 427
428 if (inode->i_ino < HFS_FIRSTUSER_CNID) {
429 switch (inode->i_ino) {
430 case HFS_ROOT_CNID:
431 break;
432 case HFS_EXT_CNID:
433 hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree);
434 return 0;
435 case HFS_CAT_CNID:
436 hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree);
437 return 0;
438 default:
439 BUG();
440 return -EIO;
441 }
442 }
443
444 if (HFS_IS_RSRC(inode))
445 main_inode = HFS_I(inode)->rsrc_inode;
446
447 if (!main_inode->i_nlink)
448 return 0;
449
450 if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd))
451 /* panic? */
452 return -EIO;
453
454 fd.search_key->cat = HFS_I(main_inode)->cat_key;
455 if (hfs_brec_find(&fd))
456 /* panic? */
457 goto out;
458
459 if (S_ISDIR(main_inode->i_mode)) {
460 if (fd.entrylength < sizeof(struct hfs_cat_dir))
461 /* panic? */;
462 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
463 sizeof(struct hfs_cat_dir));
464 if (rec.type != HFS_CDR_DIR ||
465 be32_to_cpu(rec.dir.DirID) != inode->i_ino) {
466 }
467
468 rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime);
469 rec.dir.Val = cpu_to_be16(inode->i_size - 2);
470
471 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
472 sizeof(struct hfs_cat_dir));
473 } else if (HFS_IS_RSRC(inode)) {
474 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
475 sizeof(struct hfs_cat_file));
476 hfs_inode_write_fork(inode, rec.file.RExtRec,
477 &rec.file.RLgLen, &rec.file.RPyLen);
478 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
479 sizeof(struct hfs_cat_file));
480 } else {
481 if (fd.entrylength < sizeof(struct hfs_cat_file))
482 /* panic? */;
483 hfs_bnode_read(fd.bnode, &rec, fd.entryoffset,
484 sizeof(struct hfs_cat_file));
485 if (rec.type != HFS_CDR_FIL ||
486 be32_to_cpu(rec.file.FlNum) != inode->i_ino) {
487 }
488
489 if (inode->i_mode & S_IWUSR)
490 rec.file.Flags &= ~HFS_FIL_LOCK;
491 else
492 rec.file.Flags |= HFS_FIL_LOCK;
493 hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen);
494 rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime);
495
496 hfs_bnode_write(fd.bnode, &rec, fd.entryoffset,
497 sizeof(struct hfs_cat_file));
498 }
499out:
500 hfs_find_exit(&fd);
501 return 0;
502}
503
504static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry,
00cd8dd3 505 unsigned int flags)
1da177e4
LT		 506{
507 struct inode *inode = NULL;
508 hfs_cat_rec rec;
509 struct hfs_find_data fd;
510 int res;
511
512 if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
513 goto out;
514
515 inode = HFS_I(dir)->rsrc_inode;
516 if (inode)
517 goto out;
518
519 inode = new_inode(dir->i_sb);
520 if (!inode)
521 return ERR_PTR(-ENOMEM);
522
9509f178
AK		 523 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
524 if (res) {
525 iput(inode);
526 return ERR_PTR(res);
527 }
1da177e4
LT		 528 fd.search_key->cat = HFS_I(dir)->cat_key;
529 res = hfs_brec_read(&fd, &rec, sizeof(rec));
530 if (!res) {
531 struct hfs_iget_data idata = { NULL, &rec };
532 hfs_read_inode(inode, &idata);
533 }
534 hfs_find_exit(&fd);
535 if (res) {
536 iput(inode);
537 return ERR_PTR(res);
538 }
539 HFS_I(inode)->rsrc_inode = dir;
540 HFS_I(dir)->rsrc_inode = inode;
541 igrab(dir);
89b0fc38 542 hlist_add_fake(&inode->i_hash);
1da177e4
LT		 543 mark_inode_dirty(inode);
544out:
545 d_add(dentry, inode);
546 return NULL;
547}
548
b57922d9 549void hfs_evict_inode(struct inode *inode)
1da177e4 550{
91b0abe3 551 truncate_inode_pages_final(&inode->i_data);
dbd5768f 552 clear_inode(inode);
1da177e4
LT		 553 if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) {
554 HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
555 iput(HFS_I(inode)->rsrc_inode);
556 }
557}
558
1da177e4
LT		 559static int hfs_file_open(struct inode *inode, struct file *file)
560{
561 if (HFS_IS_RSRC(inode))
562 inode = HFS_I(inode)->rsrc_inode;
1da177e4
LT		 563 atomic_inc(&HFS_I(inode)->opencnt);
564 return 0;
565}
566
567static int hfs_file_release(struct inode *inode, struct file *file)
568{
569 //struct super_block *sb = inode->i_sb;
570
571 if (HFS_IS_RSRC(inode))
572 inode = HFS_I(inode)->rsrc_inode;
1da177e4 573 if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
5955102c 574 inode_lock(inode);
1da177e4
LT		 575 hfs_file_truncate(inode);
576 //if (inode->i_flags & S_DEAD) {
577 // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
578 // hfs_delete_inode(inode);
579 //}
5955102c 580 inode_unlock(inode);
1da177e4
LT		 581 }
582 return 0;
583}
584
585/*
586 * hfs_notify_change()
587 *
588 * Based very closely on fs/msdos/inode.c by Werner Almesberger
589 *
590 * This is the notify_change() field in the super_operations structure
591 * for HFS file systems. The purpose is to take that changes made to
592 * an inode and apply then in a filesystem-dependent manner. In this
593 * case the process has a few of tasks to do:
594 * 1) prevent changes to the i_uid and i_gid fields.
595 * 2) map file permissions to the closest allowable permissions
596 * 3) Since multiple Linux files can share the same on-disk inode under
597 * HFS (for instance the data and resource forks of a file) a change
598 * to permissions must be applied to all other in-core inodes which
599 * correspond to the same HFS file.
600 */
601
602int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
603{
2b0143b5 604 struct inode *inode = d_inode(dentry);
1da177e4
LT		 605 struct hfs_sb_info *hsb = HFS_SB(inode->i_sb);
606 int error;
607
608 error = inode_change_ok(inode, attr); /* basic permission checks */
609 if (error)
610 return error;
611
612 /* no uig/gid changes and limit which mode bits can be set */
613 if (((attr->ia_valid & ATTR_UID) &&
43b5e4cc 614 (!uid_eq(attr->ia_uid, hsb->s_uid))) ||
1da177e4 615 ((attr->ia_valid & ATTR_GID) &&
43b5e4cc 616 (!gid_eq(attr->ia_gid, hsb->s_gid))) ||
1da177e4
LT		 617 ((attr->ia_valid & ATTR_MODE) &&
618 ((S_ISDIR(inode->i_mode) &&
619 (attr->ia_mode != inode->i_mode)) ||
620 (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) {
621 return hsb->s_quiet ? 0 : error;
622 }
623
624 if (attr->ia_valid & ATTR_MODE) {
625 /* Only the 'w' bits can ever change and only all together. */
626 if (attr->ia_mode & S_IWUSR)
627 attr->ia_mode = inode->i_mode | S_IWUGO;
628 else
629 attr->ia_mode = inode->i_mode & ~S_IWUGO;
630 attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask;
631 }
1da177e4 632
1025774c
CH		 633 if ((attr->ia_valid & ATTR_SIZE) &&
634 attr->ia_size != i_size_read(inode)) {
562c72aa
CH		 635 inode_dio_wait(inode);
636
c8cf464b 637 error = inode_newsize_ok(inode, attr->ia_size);
1025774c
CH		 638 if (error)
639 return error;
c8cf464b
MS		 640
641 truncate_setsize(inode, attr->ia_size);
642 hfs_file_truncate(inode);
1025774c
CH		 643 }
644
645 setattr_copy(inode, attr);
646 mark_inode_dirty(inode);
1da177e4
LT		 647 return 0;
648}
649
02c24a82
JB		 650static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end,
651 int datasync)
b5fc510c
AV		 652{
653 struct inode *inode = filp->f_mapping->host;
654 struct super_block * sb;
655 int ret, err;
656
02c24a82
JB		 657 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
658 if (ret)
659 return ret;
5955102c 660 inode_lock(inode);
02c24a82 661
b5fc510c
AV		 662 /* sync the inode to buffers */
663 ret = write_inode_now(inode, 0);
664
665 /* sync the superblock to buffers */
666 sb = inode->i_sb;
43829731 667 flush_delayed_work(&HFS_SB(sb)->mdb_work);
b5fc510c
AV		 668 /* .. finally sync the buffers to disk */
669 err = sync_blockdev(sb->s_bdev);
670 if (!ret)
671 ret = err;
5955102c 672 inode_unlock(inode);
b5fc510c
AV		 673 return ret;
674}
1da177e4 675
4b6f5d20 676static const struct file_operations hfs_file_operations = {
1da177e4 677 .llseek = generic_file_llseek,
aad4f8bb 678 .read_iter = generic_file_read_iter,
8174202b 679 .write_iter = generic_file_write_iter,
1da177e4 680 .mmap = generic_file_mmap,
5ffc4ef4 681 .splice_read = generic_file_splice_read,
b5fc510c 682 .fsync = hfs_file_fsync,
1da177e4
LT		 683 .open = hfs_file_open,
684 .release = hfs_file_release,
685};
686
92e1d5be 687static const struct inode_operations hfs_file_inode_operations = {
1da177e4 688 .lookup = hfs_file_lookup,
1da177e4 689 .setattr = hfs_inode_setattr,
1da177e4
LT		 690 .setxattr = hfs_setxattr,
691 .getxattr = hfs_getxattr,
692 .listxattr = hfs_listxattr,
693};
Linux 6.x block layer and io_uring tree(s)