Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
17 | |
18 | #include "hfs_fs.h" | |
19 | #include "btree.h" | |
20 | ||
4b6f5d20 | 21 | static const struct file_operations hfs_file_operations; |
92e1d5be | 22 | static const struct inode_operations hfs_file_inode_operations; |
1da177e4 LT |
23 | |
24 | /*================ Variable-like macros ================*/ | |
25 | ||
26 | #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO) | |
27 | ||
28 | static int hfs_writepage(struct page *page, struct writeback_control *wbc) | |
29 | { | |
30 | return block_write_full_page(page, hfs_get_block, wbc); | |
31 | } | |
32 | ||
33 | static int hfs_readpage(struct file *file, struct page *page) | |
34 | { | |
35 | return block_read_full_page(page, hfs_get_block); | |
36 | } | |
37 | ||
7903d9ee NP |
38 | static int hfs_write_begin(struct file *file, struct address_space *mapping, |
39 | loff_t pos, unsigned len, unsigned flags, | |
40 | struct page **pagep, void **fsdata) | |
1da177e4 | 41 | { |
7903d9ee NP |
42 | *pagep = NULL; |
43 | return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, | |
44 | hfs_get_block, | |
45 | &HFS_I(mapping->host)->phys_size); | |
1da177e4 LT |
46 | } |
47 | ||
48 | static sector_t hfs_bmap(struct address_space *mapping, sector_t block) | |
49 | { | |
50 | return generic_block_bmap(mapping, block, hfs_get_block); | |
51 | } | |
52 | ||
27496a8c | 53 | static int hfs_releasepage(struct page *page, gfp_t mask) |
1da177e4 LT |
54 | { |
55 | struct inode *inode = page->mapping->host; | |
56 | struct super_block *sb = inode->i_sb; | |
57 | struct hfs_btree *tree; | |
58 | struct hfs_bnode *node; | |
59 | u32 nidx; | |
60 | int i, res = 1; | |
61 | ||
62 | switch (inode->i_ino) { | |
63 | case HFS_EXT_CNID: | |
64 | tree = HFS_SB(sb)->ext_tree; | |
65 | break; | |
66 | case HFS_CAT_CNID: | |
67 | tree = HFS_SB(sb)->cat_tree; | |
68 | break; | |
69 | default: | |
70 | BUG(); | |
71 | return 0; | |
72 | } | |
eb2e5f45 DA |
73 | |
74 | if (!tree) | |
75 | return 0; | |
76 | ||
1da177e4 LT |
77 | if (tree->node_size >= PAGE_CACHE_SIZE) { |
78 | nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); | |
79 | spin_lock(&tree->hash_lock); | |
80 | node = hfs_bnode_findhash(tree, nidx); | |
81 | if (!node) | |
82 | ; | |
83 | else if (atomic_read(&node->refcnt)) | |
84 | res = 0; | |
85 | if (res && node) { | |
86 | hfs_bnode_unhash(node); | |
87 | hfs_bnode_free(node); | |
88 | } | |
89 | spin_unlock(&tree->hash_lock); | |
90 | } else { | |
91 | nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); | |
92 | i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); | |
93 | spin_lock(&tree->hash_lock); | |
94 | do { | |
95 | node = hfs_bnode_findhash(tree, nidx++); | |
96 | if (!node) | |
97 | continue; | |
98 | if (atomic_read(&node->refcnt)) { | |
99 | res = 0; | |
100 | break; | |
101 | } | |
102 | hfs_bnode_unhash(node); | |
103 | hfs_bnode_free(node); | |
104 | } while (--i && nidx < tree->node_count); | |
105 | spin_unlock(&tree->hash_lock); | |
106 | } | |
1da177e4 LT |
107 | return res ? try_to_free_buffers(page) : 0; |
108 | } | |
109 | ||
1da177e4 LT |
110 | static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb, |
111 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
112 | { | |
113 | struct file *file = iocb->ki_filp; | |
c5288960 | 114 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
1da177e4 LT |
115 | |
116 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
1d8fa7a2 | 117 | offset, nr_segs, hfs_get_block, NULL); |
1da177e4 LT |
118 | } |
119 | ||
120 | static int hfs_writepages(struct address_space *mapping, | |
121 | struct writeback_control *wbc) | |
122 | { | |
123 | return mpage_writepages(mapping, wbc, hfs_get_block); | |
124 | } | |
125 | ||
f5e54d6e | 126 | const struct address_space_operations hfs_btree_aops = { |
1da177e4 LT |
127 | .readpage = hfs_readpage, |
128 | .writepage = hfs_writepage, | |
129 | .sync_page = block_sync_page, | |
7903d9ee NP |
130 | .write_begin = hfs_write_begin, |
131 | .write_end = generic_write_end, | |
1da177e4 LT |
132 | .bmap = hfs_bmap, |
133 | .releasepage = hfs_releasepage, | |
134 | }; | |
135 | ||
f5e54d6e | 136 | const struct address_space_operations hfs_aops = { |
1da177e4 LT |
137 | .readpage = hfs_readpage, |
138 | .writepage = hfs_writepage, | |
139 | .sync_page = block_sync_page, | |
7903d9ee NP |
140 | .write_begin = hfs_write_begin, |
141 | .write_end = generic_write_end, | |
1da177e4 LT |
142 | .bmap = hfs_bmap, |
143 | .direct_IO = hfs_direct_IO, | |
144 | .writepages = hfs_writepages, | |
145 | }; | |
146 | ||
147 | /* | |
148 | * hfs_new_inode | |
149 | */ | |
150 | struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, int mode) | |
151 | { | |
152 | struct super_block *sb = dir->i_sb; | |
153 | struct inode *inode = new_inode(sb); | |
154 | if (!inode) | |
155 | return NULL; | |
156 | ||
39f8d472 | 157 | mutex_init(&HFS_I(inode)->extents_lock); |
1da177e4 | 158 | INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); |
328b9227 | 159 | hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name); |
1da177e4 LT |
160 | inode->i_ino = HFS_SB(sb)->next_id++; |
161 | inode->i_mode = mode; | |
94c9a5ee DH |
162 | inode->i_uid = current_fsuid(); |
163 | inode->i_gid = current_fsgid(); | |
1da177e4 LT |
164 | inode->i_nlink = 1; |
165 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
1da177e4 LT |
166 | HFS_I(inode)->flags = 0; |
167 | HFS_I(inode)->rsrc_inode = NULL; | |
168 | HFS_I(inode)->fs_blocks = 0; | |
169 | if (S_ISDIR(mode)) { | |
170 | inode->i_size = 2; | |
171 | HFS_SB(sb)->folder_count++; | |
172 | if (dir->i_ino == HFS_ROOT_CNID) | |
173 | HFS_SB(sb)->root_dirs++; | |
174 | inode->i_op = &hfs_dir_inode_operations; | |
175 | inode->i_fop = &hfs_dir_operations; | |
176 | inode->i_mode |= S_IRWXUGO; | |
177 | inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; | |
178 | } else if (S_ISREG(mode)) { | |
179 | HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; | |
180 | HFS_SB(sb)->file_count++; | |
181 | if (dir->i_ino == HFS_ROOT_CNID) | |
182 | HFS_SB(sb)->root_files++; | |
183 | inode->i_op = &hfs_file_inode_operations; | |
184 | inode->i_fop = &hfs_file_operations; | |
185 | inode->i_mapping->a_ops = &hfs_aops; | |
186 | inode->i_mode |= S_IRUGO|S_IXUGO; | |
187 | if (mode & S_IWUSR) | |
188 | inode->i_mode |= S_IWUGO; | |
189 | inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; | |
190 | HFS_I(inode)->phys_size = 0; | |
191 | HFS_I(inode)->alloc_blocks = 0; | |
192 | HFS_I(inode)->first_blocks = 0; | |
193 | HFS_I(inode)->cached_start = 0; | |
194 | HFS_I(inode)->cached_blocks = 0; | |
195 | memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); | |
196 | memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); | |
197 | } | |
198 | insert_inode_hash(inode); | |
199 | mark_inode_dirty(inode); | |
200 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
201 | sb->s_dirt = 1; | |
202 | ||
203 | return inode; | |
204 | } | |
205 | ||
206 | void hfs_delete_inode(struct inode *inode) | |
207 | { | |
208 | struct super_block *sb = inode->i_sb; | |
209 | ||
210 | dprint(DBG_INODE, "delete_inode: %lu\n", inode->i_ino); | |
211 | if (S_ISDIR(inode->i_mode)) { | |
212 | HFS_SB(sb)->folder_count--; | |
213 | if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) | |
214 | HFS_SB(sb)->root_dirs--; | |
215 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
216 | sb->s_dirt = 1; | |
217 | return; | |
218 | } | |
219 | HFS_SB(sb)->file_count--; | |
220 | if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) | |
221 | HFS_SB(sb)->root_files--; | |
222 | if (S_ISREG(inode->i_mode)) { | |
223 | if (!inode->i_nlink) { | |
224 | inode->i_size = 0; | |
225 | hfs_file_truncate(inode); | |
226 | } | |
227 | } | |
228 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
229 | sb->s_dirt = 1; | |
230 | } | |
231 | ||
232 | void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, | |
233 | __be32 __log_size, __be32 phys_size, u32 clump_size) | |
234 | { | |
235 | struct super_block *sb = inode->i_sb; | |
236 | u32 log_size = be32_to_cpu(__log_size); | |
237 | u16 count; | |
238 | int i; | |
239 | ||
240 | memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); | |
241 | for (count = 0, i = 0; i < 3; i++) | |
242 | count += be16_to_cpu(ext[i].count); | |
243 | HFS_I(inode)->first_blocks = count; | |
244 | ||
245 | inode->i_size = HFS_I(inode)->phys_size = log_size; | |
246 | HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
247 | inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); | |
248 | HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / | |
249 | HFS_SB(sb)->alloc_blksz; | |
250 | HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; | |
251 | if (!HFS_I(inode)->clump_blocks) | |
252 | HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; | |
253 | } | |
254 | ||
255 | struct hfs_iget_data { | |
256 | struct hfs_cat_key *key; | |
257 | hfs_cat_rec *rec; | |
258 | }; | |
259 | ||
260 | static int hfs_test_inode(struct inode *inode, void *data) | |
261 | { | |
262 | struct hfs_iget_data *idata = data; | |
263 | hfs_cat_rec *rec; | |
264 | ||
265 | rec = idata->rec; | |
266 | switch (rec->type) { | |
267 | case HFS_CDR_DIR: | |
268 | return inode->i_ino == be32_to_cpu(rec->dir.DirID); | |
269 | case HFS_CDR_FIL: | |
270 | return inode->i_ino == be32_to_cpu(rec->file.FlNum); | |
271 | default: | |
272 | BUG(); | |
273 | return 1; | |
274 | } | |
275 | } | |
276 | ||
277 | /* | |
278 | * hfs_read_inode | |
279 | */ | |
280 | static int hfs_read_inode(struct inode *inode, void *data) | |
281 | { | |
282 | struct hfs_iget_data *idata = data; | |
283 | struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); | |
284 | hfs_cat_rec *rec; | |
285 | ||
286 | HFS_I(inode)->flags = 0; | |
287 | HFS_I(inode)->rsrc_inode = NULL; | |
39f8d472 | 288 | mutex_init(&HFS_I(inode)->extents_lock); |
1da177e4 LT |
289 | INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); |
290 | ||
291 | /* Initialize the inode */ | |
292 | inode->i_uid = hsb->s_uid; | |
293 | inode->i_gid = hsb->s_gid; | |
294 | inode->i_nlink = 1; | |
1da177e4 LT |
295 | |
296 | if (idata->key) | |
297 | HFS_I(inode)->cat_key = *idata->key; | |
298 | else | |
299 | HFS_I(inode)->flags |= HFS_FLG_RSRC; | |
300 | HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; | |
301 | ||
302 | rec = idata->rec; | |
303 | switch (rec->type) { | |
304 | case HFS_CDR_FIL: | |
305 | if (!HFS_IS_RSRC(inode)) { | |
306 | hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, | |
307 | rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); | |
308 | } else { | |
309 | hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, | |
310 | rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); | |
311 | } | |
312 | ||
313 | inode->i_ino = be32_to_cpu(rec->file.FlNum); | |
314 | inode->i_mode = S_IRUGO | S_IXUGO; | |
315 | if (!(rec->file.Flags & HFS_FIL_LOCK)) | |
316 | inode->i_mode |= S_IWUGO; | |
317 | inode->i_mode &= ~hsb->s_file_umask; | |
318 | inode->i_mode |= S_IFREG; | |
319 | inode->i_ctime = inode->i_atime = inode->i_mtime = | |
320 | hfs_m_to_utime(rec->file.MdDat); | |
321 | inode->i_op = &hfs_file_inode_operations; | |
322 | inode->i_fop = &hfs_file_operations; | |
323 | inode->i_mapping->a_ops = &hfs_aops; | |
324 | break; | |
325 | case HFS_CDR_DIR: | |
326 | inode->i_ino = be32_to_cpu(rec->dir.DirID); | |
327 | inode->i_size = be16_to_cpu(rec->dir.Val) + 2; | |
328 | HFS_I(inode)->fs_blocks = 0; | |
329 | inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); | |
330 | inode->i_ctime = inode->i_atime = inode->i_mtime = | |
331 | hfs_m_to_utime(rec->dir.MdDat); | |
332 | inode->i_op = &hfs_dir_inode_operations; | |
333 | inode->i_fop = &hfs_dir_operations; | |
334 | break; | |
335 | default: | |
336 | make_bad_inode(inode); | |
337 | } | |
338 | return 0; | |
339 | } | |
340 | ||
341 | /* | |
342 | * __hfs_iget() | |
343 | * | |
344 | * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in | |
345 | * the catalog B-tree and the 'type' of the desired file return the | |
346 | * inode for that file/directory or NULL. Note that 'type' indicates | |
347 | * whether we want the actual file or directory, or the corresponding | |
348 | * metadata (AppleDouble header file or CAP metadata file). | |
349 | */ | |
350 | struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) | |
351 | { | |
352 | struct hfs_iget_data data = { key, rec }; | |
353 | struct inode *inode; | |
354 | u32 cnid; | |
355 | ||
356 | switch (rec->type) { | |
357 | case HFS_CDR_DIR: | |
358 | cnid = be32_to_cpu(rec->dir.DirID); | |
359 | break; | |
360 | case HFS_CDR_FIL: | |
361 | cnid = be32_to_cpu(rec->file.FlNum); | |
362 | break; | |
363 | default: | |
364 | return NULL; | |
365 | } | |
366 | inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); | |
367 | if (inode && (inode->i_state & I_NEW)) | |
368 | unlock_new_inode(inode); | |
369 | return inode; | |
370 | } | |
371 | ||
372 | void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, | |
373 | __be32 *log_size, __be32 *phys_size) | |
374 | { | |
375 | memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); | |
376 | ||
377 | if (log_size) | |
378 | *log_size = cpu_to_be32(inode->i_size); | |
379 | if (phys_size) | |
380 | *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * | |
381 | HFS_SB(inode->i_sb)->alloc_blksz); | |
382 | } | |
383 | ||
a9185b41 | 384 | int hfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 LT |
385 | { |
386 | struct inode *main_inode = inode; | |
387 | struct hfs_find_data fd; | |
388 | hfs_cat_rec rec; | |
389 | ||
390 | dprint(DBG_INODE, "hfs_write_inode: %lu\n", inode->i_ino); | |
391 | hfs_ext_write_extent(inode); | |
392 | ||
393 | if (inode->i_ino < HFS_FIRSTUSER_CNID) { | |
394 | switch (inode->i_ino) { | |
395 | case HFS_ROOT_CNID: | |
396 | break; | |
397 | case HFS_EXT_CNID: | |
398 | hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); | |
399 | return 0; | |
400 | case HFS_CAT_CNID: | |
401 | hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); | |
402 | return 0; | |
403 | default: | |
404 | BUG(); | |
405 | return -EIO; | |
406 | } | |
407 | } | |
408 | ||
409 | if (HFS_IS_RSRC(inode)) | |
410 | main_inode = HFS_I(inode)->rsrc_inode; | |
411 | ||
412 | if (!main_inode->i_nlink) | |
413 | return 0; | |
414 | ||
415 | if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) | |
416 | /* panic? */ | |
417 | return -EIO; | |
418 | ||
419 | fd.search_key->cat = HFS_I(main_inode)->cat_key; | |
420 | if (hfs_brec_find(&fd)) | |
421 | /* panic? */ | |
422 | goto out; | |
423 | ||
424 | if (S_ISDIR(main_inode->i_mode)) { | |
425 | if (fd.entrylength < sizeof(struct hfs_cat_dir)) | |
426 | /* panic? */; | |
427 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
428 | sizeof(struct hfs_cat_dir)); | |
429 | if (rec.type != HFS_CDR_DIR || | |
430 | be32_to_cpu(rec.dir.DirID) != inode->i_ino) { | |
431 | } | |
432 | ||
433 | rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime); | |
434 | rec.dir.Val = cpu_to_be16(inode->i_size - 2); | |
435 | ||
436 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
437 | sizeof(struct hfs_cat_dir)); | |
438 | } else if (HFS_IS_RSRC(inode)) { | |
439 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
440 | sizeof(struct hfs_cat_file)); | |
441 | hfs_inode_write_fork(inode, rec.file.RExtRec, | |
442 | &rec.file.RLgLen, &rec.file.RPyLen); | |
443 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
444 | sizeof(struct hfs_cat_file)); | |
445 | } else { | |
446 | if (fd.entrylength < sizeof(struct hfs_cat_file)) | |
447 | /* panic? */; | |
448 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
449 | sizeof(struct hfs_cat_file)); | |
450 | if (rec.type != HFS_CDR_FIL || | |
451 | be32_to_cpu(rec.file.FlNum) != inode->i_ino) { | |
452 | } | |
453 | ||
454 | if (inode->i_mode & S_IWUSR) | |
455 | rec.file.Flags &= ~HFS_FIL_LOCK; | |
456 | else | |
457 | rec.file.Flags |= HFS_FIL_LOCK; | |
458 | hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); | |
459 | rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime); | |
460 | ||
461 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
462 | sizeof(struct hfs_cat_file)); | |
463 | } | |
464 | out: | |
465 | hfs_find_exit(&fd); | |
466 | return 0; | |
467 | } | |
468 | ||
469 | static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, | |
470 | struct nameidata *nd) | |
471 | { | |
472 | struct inode *inode = NULL; | |
473 | hfs_cat_rec rec; | |
474 | struct hfs_find_data fd; | |
475 | int res; | |
476 | ||
477 | if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) | |
478 | goto out; | |
479 | ||
480 | inode = HFS_I(dir)->rsrc_inode; | |
481 | if (inode) | |
482 | goto out; | |
483 | ||
484 | inode = new_inode(dir->i_sb); | |
485 | if (!inode) | |
486 | return ERR_PTR(-ENOMEM); | |
487 | ||
488 | hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); | |
489 | fd.search_key->cat = HFS_I(dir)->cat_key; | |
490 | res = hfs_brec_read(&fd, &rec, sizeof(rec)); | |
491 | if (!res) { | |
492 | struct hfs_iget_data idata = { NULL, &rec }; | |
493 | hfs_read_inode(inode, &idata); | |
494 | } | |
495 | hfs_find_exit(&fd); | |
496 | if (res) { | |
497 | iput(inode); | |
498 | return ERR_PTR(res); | |
499 | } | |
500 | HFS_I(inode)->rsrc_inode = dir; | |
501 | HFS_I(dir)->rsrc_inode = inode; | |
502 | igrab(dir); | |
503 | hlist_add_head(&inode->i_hash, &HFS_SB(dir->i_sb)->rsrc_inodes); | |
504 | mark_inode_dirty(inode); | |
505 | out: | |
506 | d_add(dentry, inode); | |
507 | return NULL; | |
508 | } | |
509 | ||
510 | void hfs_clear_inode(struct inode *inode) | |
511 | { | |
512 | if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { | |
513 | HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; | |
514 | iput(HFS_I(inode)->rsrc_inode); | |
515 | } | |
516 | } | |
517 | ||
1da177e4 LT |
518 | static int hfs_file_open(struct inode *inode, struct file *file) |
519 | { | |
520 | if (HFS_IS_RSRC(inode)) | |
521 | inode = HFS_I(inode)->rsrc_inode; | |
1da177e4 LT |
522 | atomic_inc(&HFS_I(inode)->opencnt); |
523 | return 0; | |
524 | } | |
525 | ||
526 | static int hfs_file_release(struct inode *inode, struct file *file) | |
527 | { | |
528 | //struct super_block *sb = inode->i_sb; | |
529 | ||
530 | if (HFS_IS_RSRC(inode)) | |
531 | inode = HFS_I(inode)->rsrc_inode; | |
1da177e4 | 532 | if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { |
1b1dcc1b | 533 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
534 | hfs_file_truncate(inode); |
535 | //if (inode->i_flags & S_DEAD) { | |
536 | // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); | |
537 | // hfs_delete_inode(inode); | |
538 | //} | |
1b1dcc1b | 539 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
540 | } |
541 | return 0; | |
542 | } | |
543 | ||
544 | /* | |
545 | * hfs_notify_change() | |
546 | * | |
547 | * Based very closely on fs/msdos/inode.c by Werner Almesberger | |
548 | * | |
549 | * This is the notify_change() field in the super_operations structure | |
550 | * for HFS file systems. The purpose is to take that changes made to | |
551 | * an inode and apply then in a filesystem-dependent manner. In this | |
552 | * case the process has a few of tasks to do: | |
553 | * 1) prevent changes to the i_uid and i_gid fields. | |
554 | * 2) map file permissions to the closest allowable permissions | |
555 | * 3) Since multiple Linux files can share the same on-disk inode under | |
556 | * HFS (for instance the data and resource forks of a file) a change | |
557 | * to permissions must be applied to all other in-core inodes which | |
558 | * correspond to the same HFS file. | |
559 | */ | |
560 | ||
561 | int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr) | |
562 | { | |
563 | struct inode *inode = dentry->d_inode; | |
564 | struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); | |
565 | int error; | |
566 | ||
567 | error = inode_change_ok(inode, attr); /* basic permission checks */ | |
568 | if (error) | |
569 | return error; | |
570 | ||
571 | /* no uig/gid changes and limit which mode bits can be set */ | |
572 | if (((attr->ia_valid & ATTR_UID) && | |
573 | (attr->ia_uid != hsb->s_uid)) || | |
574 | ((attr->ia_valid & ATTR_GID) && | |
575 | (attr->ia_gid != hsb->s_gid)) || | |
576 | ((attr->ia_valid & ATTR_MODE) && | |
577 | ((S_ISDIR(inode->i_mode) && | |
578 | (attr->ia_mode != inode->i_mode)) || | |
579 | (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { | |
580 | return hsb->s_quiet ? 0 : error; | |
581 | } | |
582 | ||
583 | if (attr->ia_valid & ATTR_MODE) { | |
584 | /* Only the 'w' bits can ever change and only all together. */ | |
585 | if (attr->ia_mode & S_IWUSR) | |
586 | attr->ia_mode = inode->i_mode | S_IWUGO; | |
587 | else | |
588 | attr->ia_mode = inode->i_mode & ~S_IWUGO; | |
589 | attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; | |
590 | } | |
591 | error = inode_setattr(inode, attr); | |
592 | if (error) | |
593 | return error; | |
594 | ||
595 | return 0; | |
596 | } | |
597 | ||
598 | ||
4b6f5d20 | 599 | static const struct file_operations hfs_file_operations = { |
1da177e4 | 600 | .llseek = generic_file_llseek, |
543ade1f BP |
601 | .read = do_sync_read, |
602 | .aio_read = generic_file_aio_read, | |
603 | .write = do_sync_write, | |
604 | .aio_write = generic_file_aio_write, | |
1da177e4 | 605 | .mmap = generic_file_mmap, |
5ffc4ef4 | 606 | .splice_read = generic_file_splice_read, |
1da177e4 LT |
607 | .fsync = file_fsync, |
608 | .open = hfs_file_open, | |
609 | .release = hfs_file_release, | |
610 | }; | |
611 | ||
92e1d5be | 612 | static const struct inode_operations hfs_file_inode_operations = { |
1da177e4 LT |
613 | .lookup = hfs_file_lookup, |
614 | .truncate = hfs_file_truncate, | |
615 | .setattr = hfs_inode_setattr, | |
1da177e4 LT |
616 | .setxattr = hfs_setxattr, |
617 | .getxattr = hfs_getxattr, | |
618 | .listxattr = hfs_listxattr, | |
619 | }; |