Commit | Line | Data |
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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 LT |
15 | #include <linux/mpage.h> |
16 | ||
17 | #include "hfs_fs.h" | |
18 | #include "btree.h" | |
19 | ||
20 | static struct file_operations hfs_file_operations; | |
21 | static struct inode_operations hfs_file_inode_operations; | |
22 | ||
23 | /*================ Variable-like macros ================*/ | |
24 | ||
25 | #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO) | |
26 | ||
27 | static int hfs_writepage(struct page *page, struct writeback_control *wbc) | |
28 | { | |
29 | return block_write_full_page(page, hfs_get_block, wbc); | |
30 | } | |
31 | ||
32 | static int hfs_readpage(struct file *file, struct page *page) | |
33 | { | |
34 | return block_read_full_page(page, hfs_get_block); | |
35 | } | |
36 | ||
37 | static int hfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) | |
38 | { | |
39 | return cont_prepare_write(page, from, to, hfs_get_block, | |
40 | &HFS_I(page->mapping->host)->phys_size); | |
41 | } | |
42 | ||
43 | static sector_t hfs_bmap(struct address_space *mapping, sector_t block) | |
44 | { | |
45 | return generic_block_bmap(mapping, block, hfs_get_block); | |
46 | } | |
47 | ||
27496a8c | 48 | static int hfs_releasepage(struct page *page, gfp_t mask) |
1da177e4 LT |
49 | { |
50 | struct inode *inode = page->mapping->host; | |
51 | struct super_block *sb = inode->i_sb; | |
52 | struct hfs_btree *tree; | |
53 | struct hfs_bnode *node; | |
54 | u32 nidx; | |
55 | int i, res = 1; | |
56 | ||
57 | switch (inode->i_ino) { | |
58 | case HFS_EXT_CNID: | |
59 | tree = HFS_SB(sb)->ext_tree; | |
60 | break; | |
61 | case HFS_CAT_CNID: | |
62 | tree = HFS_SB(sb)->cat_tree; | |
63 | break; | |
64 | default: | |
65 | BUG(); | |
66 | return 0; | |
67 | } | |
68 | if (tree->node_size >= PAGE_CACHE_SIZE) { | |
69 | nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); | |
70 | spin_lock(&tree->hash_lock); | |
71 | node = hfs_bnode_findhash(tree, nidx); | |
72 | if (!node) | |
73 | ; | |
74 | else if (atomic_read(&node->refcnt)) | |
75 | res = 0; | |
76 | if (res && node) { | |
77 | hfs_bnode_unhash(node); | |
78 | hfs_bnode_free(node); | |
79 | } | |
80 | spin_unlock(&tree->hash_lock); | |
81 | } else { | |
82 | nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); | |
83 | i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); | |
84 | spin_lock(&tree->hash_lock); | |
85 | do { | |
86 | node = hfs_bnode_findhash(tree, nidx++); | |
87 | if (!node) | |
88 | continue; | |
89 | if (atomic_read(&node->refcnt)) { | |
90 | res = 0; | |
91 | break; | |
92 | } | |
93 | hfs_bnode_unhash(node); | |
94 | hfs_bnode_free(node); | |
95 | } while (--i && nidx < tree->node_count); | |
96 | spin_unlock(&tree->hash_lock); | |
97 | } | |
98 | //printk("releasepage: %lu,%x = %d\n", page->index, mask, res); | |
99 | return res ? try_to_free_buffers(page) : 0; | |
100 | } | |
101 | ||
102 | static int hfs_get_blocks(struct inode *inode, sector_t iblock, unsigned long max_blocks, | |
103 | struct buffer_head *bh_result, int create) | |
104 | { | |
105 | int ret; | |
106 | ||
107 | ret = hfs_get_block(inode, iblock, bh_result, create); | |
108 | if (!ret) | |
109 | bh_result->b_size = (1 << inode->i_blkbits); | |
110 | return ret; | |
111 | } | |
112 | ||
113 | static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb, | |
114 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
115 | { | |
116 | struct file *file = iocb->ki_filp; | |
117 | struct inode *inode = file->f_dentry->d_inode->i_mapping->host; | |
118 | ||
119 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
120 | offset, nr_segs, hfs_get_blocks, NULL); | |
121 | } | |
122 | ||
123 | static int hfs_writepages(struct address_space *mapping, | |
124 | struct writeback_control *wbc) | |
125 | { | |
126 | return mpage_writepages(mapping, wbc, hfs_get_block); | |
127 | } | |
128 | ||
129 | struct address_space_operations hfs_btree_aops = { | |
130 | .readpage = hfs_readpage, | |
131 | .writepage = hfs_writepage, | |
132 | .sync_page = block_sync_page, | |
133 | .prepare_write = hfs_prepare_write, | |
134 | .commit_write = generic_commit_write, | |
135 | .bmap = hfs_bmap, | |
136 | .releasepage = hfs_releasepage, | |
137 | }; | |
138 | ||
139 | struct address_space_operations hfs_aops = { | |
140 | .readpage = hfs_readpage, | |
141 | .writepage = hfs_writepage, | |
142 | .sync_page = block_sync_page, | |
143 | .prepare_write = hfs_prepare_write, | |
144 | .commit_write = generic_commit_write, | |
145 | .bmap = hfs_bmap, | |
146 | .direct_IO = hfs_direct_IO, | |
147 | .writepages = hfs_writepages, | |
148 | }; | |
149 | ||
150 | /* | |
151 | * hfs_new_inode | |
152 | */ | |
153 | struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, int mode) | |
154 | { | |
155 | struct super_block *sb = dir->i_sb; | |
156 | struct inode *inode = new_inode(sb); | |
157 | if (!inode) | |
158 | return NULL; | |
159 | ||
160 | init_MUTEX(&HFS_I(inode)->extents_lock); | |
161 | INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); | |
328b9227 | 162 | hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name); |
1da177e4 LT |
163 | inode->i_ino = HFS_SB(sb)->next_id++; |
164 | inode->i_mode = mode; | |
165 | inode->i_uid = current->fsuid; | |
166 | inode->i_gid = current->fsgid; | |
167 | inode->i_nlink = 1; | |
168 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
169 | inode->i_blksize = HFS_SB(sb)->alloc_blksz; | |
170 | HFS_I(inode)->flags = 0; | |
171 | HFS_I(inode)->rsrc_inode = NULL; | |
172 | HFS_I(inode)->fs_blocks = 0; | |
173 | if (S_ISDIR(mode)) { | |
174 | inode->i_size = 2; | |
175 | HFS_SB(sb)->folder_count++; | |
176 | if (dir->i_ino == HFS_ROOT_CNID) | |
177 | HFS_SB(sb)->root_dirs++; | |
178 | inode->i_op = &hfs_dir_inode_operations; | |
179 | inode->i_fop = &hfs_dir_operations; | |
180 | inode->i_mode |= S_IRWXUGO; | |
181 | inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; | |
182 | } else if (S_ISREG(mode)) { | |
183 | HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; | |
184 | HFS_SB(sb)->file_count++; | |
185 | if (dir->i_ino == HFS_ROOT_CNID) | |
186 | HFS_SB(sb)->root_files++; | |
187 | inode->i_op = &hfs_file_inode_operations; | |
188 | inode->i_fop = &hfs_file_operations; | |
189 | inode->i_mapping->a_ops = &hfs_aops; | |
190 | inode->i_mode |= S_IRUGO|S_IXUGO; | |
191 | if (mode & S_IWUSR) | |
192 | inode->i_mode |= S_IWUGO; | |
193 | inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; | |
194 | HFS_I(inode)->phys_size = 0; | |
195 | HFS_I(inode)->alloc_blocks = 0; | |
196 | HFS_I(inode)->first_blocks = 0; | |
197 | HFS_I(inode)->cached_start = 0; | |
198 | HFS_I(inode)->cached_blocks = 0; | |
199 | memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); | |
200 | memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); | |
201 | } | |
202 | insert_inode_hash(inode); | |
203 | mark_inode_dirty(inode); | |
204 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
205 | sb->s_dirt = 1; | |
206 | ||
207 | return inode; | |
208 | } | |
209 | ||
210 | void hfs_delete_inode(struct inode *inode) | |
211 | { | |
212 | struct super_block *sb = inode->i_sb; | |
213 | ||
214 | dprint(DBG_INODE, "delete_inode: %lu\n", inode->i_ino); | |
215 | if (S_ISDIR(inode->i_mode)) { | |
216 | HFS_SB(sb)->folder_count--; | |
217 | if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) | |
218 | HFS_SB(sb)->root_dirs--; | |
219 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
220 | sb->s_dirt = 1; | |
221 | return; | |
222 | } | |
223 | HFS_SB(sb)->file_count--; | |
224 | if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) | |
225 | HFS_SB(sb)->root_files--; | |
226 | if (S_ISREG(inode->i_mode)) { | |
227 | if (!inode->i_nlink) { | |
228 | inode->i_size = 0; | |
229 | hfs_file_truncate(inode); | |
230 | } | |
231 | } | |
232 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
233 | sb->s_dirt = 1; | |
234 | } | |
235 | ||
236 | void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, | |
237 | __be32 __log_size, __be32 phys_size, u32 clump_size) | |
238 | { | |
239 | struct super_block *sb = inode->i_sb; | |
240 | u32 log_size = be32_to_cpu(__log_size); | |
241 | u16 count; | |
242 | int i; | |
243 | ||
244 | memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); | |
245 | for (count = 0, i = 0; i < 3; i++) | |
246 | count += be16_to_cpu(ext[i].count); | |
247 | HFS_I(inode)->first_blocks = count; | |
248 | ||
249 | inode->i_size = HFS_I(inode)->phys_size = log_size; | |
250 | HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
251 | inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); | |
252 | HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / | |
253 | HFS_SB(sb)->alloc_blksz; | |
254 | HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; | |
255 | if (!HFS_I(inode)->clump_blocks) | |
256 | HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; | |
257 | } | |
258 | ||
259 | struct hfs_iget_data { | |
260 | struct hfs_cat_key *key; | |
261 | hfs_cat_rec *rec; | |
262 | }; | |
263 | ||
264 | static int hfs_test_inode(struct inode *inode, void *data) | |
265 | { | |
266 | struct hfs_iget_data *idata = data; | |
267 | hfs_cat_rec *rec; | |
268 | ||
269 | rec = idata->rec; | |
270 | switch (rec->type) { | |
271 | case HFS_CDR_DIR: | |
272 | return inode->i_ino == be32_to_cpu(rec->dir.DirID); | |
273 | case HFS_CDR_FIL: | |
274 | return inode->i_ino == be32_to_cpu(rec->file.FlNum); | |
275 | default: | |
276 | BUG(); | |
277 | return 1; | |
278 | } | |
279 | } | |
280 | ||
281 | /* | |
282 | * hfs_read_inode | |
283 | */ | |
284 | static int hfs_read_inode(struct inode *inode, void *data) | |
285 | { | |
286 | struct hfs_iget_data *idata = data; | |
287 | struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); | |
288 | hfs_cat_rec *rec; | |
289 | ||
290 | HFS_I(inode)->flags = 0; | |
291 | HFS_I(inode)->rsrc_inode = NULL; | |
292 | init_MUTEX(&HFS_I(inode)->extents_lock); | |
293 | INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); | |
294 | ||
295 | /* Initialize the inode */ | |
296 | inode->i_uid = hsb->s_uid; | |
297 | inode->i_gid = hsb->s_gid; | |
298 | inode->i_nlink = 1; | |
299 | inode->i_blksize = HFS_SB(inode->i_sb)->alloc_blksz; | |
300 | ||
301 | if (idata->key) | |
302 | HFS_I(inode)->cat_key = *idata->key; | |
303 | else | |
304 | HFS_I(inode)->flags |= HFS_FLG_RSRC; | |
305 | HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; | |
306 | ||
307 | rec = idata->rec; | |
308 | switch (rec->type) { | |
309 | case HFS_CDR_FIL: | |
310 | if (!HFS_IS_RSRC(inode)) { | |
311 | hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, | |
312 | rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); | |
313 | } else { | |
314 | hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, | |
315 | rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); | |
316 | } | |
317 | ||
318 | inode->i_ino = be32_to_cpu(rec->file.FlNum); | |
319 | inode->i_mode = S_IRUGO | S_IXUGO; | |
320 | if (!(rec->file.Flags & HFS_FIL_LOCK)) | |
321 | inode->i_mode |= S_IWUGO; | |
322 | inode->i_mode &= ~hsb->s_file_umask; | |
323 | inode->i_mode |= S_IFREG; | |
324 | inode->i_ctime = inode->i_atime = inode->i_mtime = | |
325 | hfs_m_to_utime(rec->file.MdDat); | |
326 | inode->i_op = &hfs_file_inode_operations; | |
327 | inode->i_fop = &hfs_file_operations; | |
328 | inode->i_mapping->a_ops = &hfs_aops; | |
329 | break; | |
330 | case HFS_CDR_DIR: | |
331 | inode->i_ino = be32_to_cpu(rec->dir.DirID); | |
332 | inode->i_size = be16_to_cpu(rec->dir.Val) + 2; | |
333 | HFS_I(inode)->fs_blocks = 0; | |
334 | inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); | |
335 | inode->i_ctime = inode->i_atime = inode->i_mtime = | |
336 | hfs_m_to_utime(rec->dir.MdDat); | |
337 | inode->i_op = &hfs_dir_inode_operations; | |
338 | inode->i_fop = &hfs_dir_operations; | |
339 | break; | |
340 | default: | |
341 | make_bad_inode(inode); | |
342 | } | |
343 | return 0; | |
344 | } | |
345 | ||
346 | /* | |
347 | * __hfs_iget() | |
348 | * | |
349 | * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in | |
350 | * the catalog B-tree and the 'type' of the desired file return the | |
351 | * inode for that file/directory or NULL. Note that 'type' indicates | |
352 | * whether we want the actual file or directory, or the corresponding | |
353 | * metadata (AppleDouble header file or CAP metadata file). | |
354 | */ | |
355 | struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) | |
356 | { | |
357 | struct hfs_iget_data data = { key, rec }; | |
358 | struct inode *inode; | |
359 | u32 cnid; | |
360 | ||
361 | switch (rec->type) { | |
362 | case HFS_CDR_DIR: | |
363 | cnid = be32_to_cpu(rec->dir.DirID); | |
364 | break; | |
365 | case HFS_CDR_FIL: | |
366 | cnid = be32_to_cpu(rec->file.FlNum); | |
367 | break; | |
368 | default: | |
369 | return NULL; | |
370 | } | |
371 | inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); | |
372 | if (inode && (inode->i_state & I_NEW)) | |
373 | unlock_new_inode(inode); | |
374 | return inode; | |
375 | } | |
376 | ||
377 | void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, | |
378 | __be32 *log_size, __be32 *phys_size) | |
379 | { | |
380 | memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); | |
381 | ||
382 | if (log_size) | |
383 | *log_size = cpu_to_be32(inode->i_size); | |
384 | if (phys_size) | |
385 | *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * | |
386 | HFS_SB(inode->i_sb)->alloc_blksz); | |
387 | } | |
388 | ||
389 | int hfs_write_inode(struct inode *inode, int unused) | |
390 | { | |
391 | struct inode *main_inode = inode; | |
392 | struct hfs_find_data fd; | |
393 | hfs_cat_rec rec; | |
394 | ||
395 | dprint(DBG_INODE, "hfs_write_inode: %lu\n", inode->i_ino); | |
396 | hfs_ext_write_extent(inode); | |
397 | ||
398 | if (inode->i_ino < HFS_FIRSTUSER_CNID) { | |
399 | switch (inode->i_ino) { | |
400 | case HFS_ROOT_CNID: | |
401 | break; | |
402 | case HFS_EXT_CNID: | |
403 | hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); | |
404 | return 0; | |
405 | case HFS_CAT_CNID: | |
406 | hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); | |
407 | return 0; | |
408 | default: | |
409 | BUG(); | |
410 | return -EIO; | |
411 | } | |
412 | } | |
413 | ||
414 | if (HFS_IS_RSRC(inode)) | |
415 | main_inode = HFS_I(inode)->rsrc_inode; | |
416 | ||
417 | if (!main_inode->i_nlink) | |
418 | return 0; | |
419 | ||
420 | if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) | |
421 | /* panic? */ | |
422 | return -EIO; | |
423 | ||
424 | fd.search_key->cat = HFS_I(main_inode)->cat_key; | |
425 | if (hfs_brec_find(&fd)) | |
426 | /* panic? */ | |
427 | goto out; | |
428 | ||
429 | if (S_ISDIR(main_inode->i_mode)) { | |
430 | if (fd.entrylength < sizeof(struct hfs_cat_dir)) | |
431 | /* panic? */; | |
432 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
433 | sizeof(struct hfs_cat_dir)); | |
434 | if (rec.type != HFS_CDR_DIR || | |
435 | be32_to_cpu(rec.dir.DirID) != inode->i_ino) { | |
436 | } | |
437 | ||
438 | rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime); | |
439 | rec.dir.Val = cpu_to_be16(inode->i_size - 2); | |
440 | ||
441 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
442 | sizeof(struct hfs_cat_dir)); | |
443 | } else if (HFS_IS_RSRC(inode)) { | |
444 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
445 | sizeof(struct hfs_cat_file)); | |
446 | hfs_inode_write_fork(inode, rec.file.RExtRec, | |
447 | &rec.file.RLgLen, &rec.file.RPyLen); | |
448 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
449 | sizeof(struct hfs_cat_file)); | |
450 | } else { | |
451 | if (fd.entrylength < sizeof(struct hfs_cat_file)) | |
452 | /* panic? */; | |
453 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
454 | sizeof(struct hfs_cat_file)); | |
455 | if (rec.type != HFS_CDR_FIL || | |
456 | be32_to_cpu(rec.file.FlNum) != inode->i_ino) { | |
457 | } | |
458 | ||
459 | if (inode->i_mode & S_IWUSR) | |
460 | rec.file.Flags &= ~HFS_FIL_LOCK; | |
461 | else | |
462 | rec.file.Flags |= HFS_FIL_LOCK; | |
463 | hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); | |
464 | rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime); | |
465 | ||
466 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
467 | sizeof(struct hfs_cat_file)); | |
468 | } | |
469 | out: | |
470 | hfs_find_exit(&fd); | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, | |
475 | struct nameidata *nd) | |
476 | { | |
477 | struct inode *inode = NULL; | |
478 | hfs_cat_rec rec; | |
479 | struct hfs_find_data fd; | |
480 | int res; | |
481 | ||
482 | if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) | |
483 | goto out; | |
484 | ||
485 | inode = HFS_I(dir)->rsrc_inode; | |
486 | if (inode) | |
487 | goto out; | |
488 | ||
489 | inode = new_inode(dir->i_sb); | |
490 | if (!inode) | |
491 | return ERR_PTR(-ENOMEM); | |
492 | ||
493 | hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); | |
494 | fd.search_key->cat = HFS_I(dir)->cat_key; | |
495 | res = hfs_brec_read(&fd, &rec, sizeof(rec)); | |
496 | if (!res) { | |
497 | struct hfs_iget_data idata = { NULL, &rec }; | |
498 | hfs_read_inode(inode, &idata); | |
499 | } | |
500 | hfs_find_exit(&fd); | |
501 | if (res) { | |
502 | iput(inode); | |
503 | return ERR_PTR(res); | |
504 | } | |
505 | HFS_I(inode)->rsrc_inode = dir; | |
506 | HFS_I(dir)->rsrc_inode = inode; | |
507 | igrab(dir); | |
508 | hlist_add_head(&inode->i_hash, &HFS_SB(dir->i_sb)->rsrc_inodes); | |
509 | mark_inode_dirty(inode); | |
510 | out: | |
511 | d_add(dentry, inode); | |
512 | return NULL; | |
513 | } | |
514 | ||
515 | void hfs_clear_inode(struct inode *inode) | |
516 | { | |
517 | if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { | |
518 | HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; | |
519 | iput(HFS_I(inode)->rsrc_inode); | |
520 | } | |
521 | } | |
522 | ||
523 | static int hfs_permission(struct inode *inode, int mask, | |
524 | struct nameidata *nd) | |
525 | { | |
526 | if (S_ISREG(inode->i_mode) && mask & MAY_EXEC) | |
527 | return 0; | |
528 | return generic_permission(inode, mask, NULL); | |
529 | } | |
530 | ||
531 | static int hfs_file_open(struct inode *inode, struct file *file) | |
532 | { | |
533 | if (HFS_IS_RSRC(inode)) | |
534 | inode = HFS_I(inode)->rsrc_inode; | |
535 | if (atomic_read(&file->f_count) != 1) | |
536 | return 0; | |
537 | atomic_inc(&HFS_I(inode)->opencnt); | |
538 | return 0; | |
539 | } | |
540 | ||
541 | static int hfs_file_release(struct inode *inode, struct file *file) | |
542 | { | |
543 | //struct super_block *sb = inode->i_sb; | |
544 | ||
545 | if (HFS_IS_RSRC(inode)) | |
546 | inode = HFS_I(inode)->rsrc_inode; | |
547 | if (atomic_read(&file->f_count) != 0) | |
548 | return 0; | |
549 | if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { | |
550 | down(&inode->i_sem); | |
551 | hfs_file_truncate(inode); | |
552 | //if (inode->i_flags & S_DEAD) { | |
553 | // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); | |
554 | // hfs_delete_inode(inode); | |
555 | //} | |
556 | up(&inode->i_sem); | |
557 | } | |
558 | return 0; | |
559 | } | |
560 | ||
561 | /* | |
562 | * hfs_notify_change() | |
563 | * | |
564 | * Based very closely on fs/msdos/inode.c by Werner Almesberger | |
565 | * | |
566 | * This is the notify_change() field in the super_operations structure | |
567 | * for HFS file systems. The purpose is to take that changes made to | |
568 | * an inode and apply then in a filesystem-dependent manner. In this | |
569 | * case the process has a few of tasks to do: | |
570 | * 1) prevent changes to the i_uid and i_gid fields. | |
571 | * 2) map file permissions to the closest allowable permissions | |
572 | * 3) Since multiple Linux files can share the same on-disk inode under | |
573 | * HFS (for instance the data and resource forks of a file) a change | |
574 | * to permissions must be applied to all other in-core inodes which | |
575 | * correspond to the same HFS file. | |
576 | */ | |
577 | ||
578 | int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr) | |
579 | { | |
580 | struct inode *inode = dentry->d_inode; | |
581 | struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); | |
582 | int error; | |
583 | ||
584 | error = inode_change_ok(inode, attr); /* basic permission checks */ | |
585 | if (error) | |
586 | return error; | |
587 | ||
588 | /* no uig/gid changes and limit which mode bits can be set */ | |
589 | if (((attr->ia_valid & ATTR_UID) && | |
590 | (attr->ia_uid != hsb->s_uid)) || | |
591 | ((attr->ia_valid & ATTR_GID) && | |
592 | (attr->ia_gid != hsb->s_gid)) || | |
593 | ((attr->ia_valid & ATTR_MODE) && | |
594 | ((S_ISDIR(inode->i_mode) && | |
595 | (attr->ia_mode != inode->i_mode)) || | |
596 | (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { | |
597 | return hsb->s_quiet ? 0 : error; | |
598 | } | |
599 | ||
600 | if (attr->ia_valid & ATTR_MODE) { | |
601 | /* Only the 'w' bits can ever change and only all together. */ | |
602 | if (attr->ia_mode & S_IWUSR) | |
603 | attr->ia_mode = inode->i_mode | S_IWUGO; | |
604 | else | |
605 | attr->ia_mode = inode->i_mode & ~S_IWUGO; | |
606 | attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; | |
607 | } | |
608 | error = inode_setattr(inode, attr); | |
609 | if (error) | |
610 | return error; | |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | ||
616 | static struct file_operations hfs_file_operations = { | |
617 | .llseek = generic_file_llseek, | |
618 | .read = generic_file_read, | |
619 | .write = generic_file_write, | |
620 | .mmap = generic_file_mmap, | |
621 | .sendfile = generic_file_sendfile, | |
622 | .fsync = file_fsync, | |
623 | .open = hfs_file_open, | |
624 | .release = hfs_file_release, | |
625 | }; | |
626 | ||
627 | static struct inode_operations hfs_file_inode_operations = { | |
628 | .lookup = hfs_file_lookup, | |
629 | .truncate = hfs_file_truncate, | |
630 | .setattr = hfs_inode_setattr, | |
631 | .permission = hfs_permission, | |
632 | .setxattr = hfs_setxattr, | |
633 | .getxattr = hfs_getxattr, | |
634 | .listxattr = hfs_listxattr, | |
635 | }; |