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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 | 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 | ||
38 | static int hfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) | |
39 | { | |
40 | return cont_prepare_write(page, from, to, hfs_get_block, | |
41 | &HFS_I(page->mapping->host)->phys_size); | |
42 | } | |
43 | ||
44 | static sector_t hfs_bmap(struct address_space *mapping, sector_t block) | |
45 | { | |
46 | return generic_block_bmap(mapping, block, hfs_get_block); | |
47 | } | |
48 | ||
27496a8c | 49 | static int hfs_releasepage(struct page *page, gfp_t mask) |
1da177e4 LT |
50 | { |
51 | struct inode *inode = page->mapping->host; | |
52 | struct super_block *sb = inode->i_sb; | |
53 | struct hfs_btree *tree; | |
54 | struct hfs_bnode *node; | |
55 | u32 nidx; | |
56 | int i, res = 1; | |
57 | ||
58 | switch (inode->i_ino) { | |
59 | case HFS_EXT_CNID: | |
60 | tree = HFS_SB(sb)->ext_tree; | |
61 | break; | |
62 | case HFS_CAT_CNID: | |
63 | tree = HFS_SB(sb)->cat_tree; | |
64 | break; | |
65 | default: | |
66 | BUG(); | |
67 | return 0; | |
68 | } | |
69 | if (tree->node_size >= PAGE_CACHE_SIZE) { | |
70 | nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); | |
71 | spin_lock(&tree->hash_lock); | |
72 | node = hfs_bnode_findhash(tree, nidx); | |
73 | if (!node) | |
74 | ; | |
75 | else if (atomic_read(&node->refcnt)) | |
76 | res = 0; | |
77 | if (res && node) { | |
78 | hfs_bnode_unhash(node); | |
79 | hfs_bnode_free(node); | |
80 | } | |
81 | spin_unlock(&tree->hash_lock); | |
82 | } else { | |
83 | nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); | |
84 | i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); | |
85 | spin_lock(&tree->hash_lock); | |
86 | do { | |
87 | node = hfs_bnode_findhash(tree, nidx++); | |
88 | if (!node) | |
89 | continue; | |
90 | if (atomic_read(&node->refcnt)) { | |
91 | res = 0; | |
92 | break; | |
93 | } | |
94 | hfs_bnode_unhash(node); | |
95 | hfs_bnode_free(node); | |
96 | } while (--i && nidx < tree->node_count); | |
97 | spin_unlock(&tree->hash_lock); | |
98 | } | |
1da177e4 LT |
99 | return res ? try_to_free_buffers(page) : 0; |
100 | } | |
101 | ||
1da177e4 LT |
102 | static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb, |
103 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) | |
104 | { | |
105 | struct file *file = iocb->ki_filp; | |
c5288960 | 106 | struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; |
1da177e4 LT |
107 | |
108 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
1d8fa7a2 | 109 | offset, nr_segs, hfs_get_block, NULL); |
1da177e4 LT |
110 | } |
111 | ||
112 | static int hfs_writepages(struct address_space *mapping, | |
113 | struct writeback_control *wbc) | |
114 | { | |
115 | return mpage_writepages(mapping, wbc, hfs_get_block); | |
116 | } | |
117 | ||
f5e54d6e | 118 | const struct address_space_operations hfs_btree_aops = { |
1da177e4 LT |
119 | .readpage = hfs_readpage, |
120 | .writepage = hfs_writepage, | |
121 | .sync_page = block_sync_page, | |
122 | .prepare_write = hfs_prepare_write, | |
123 | .commit_write = generic_commit_write, | |
124 | .bmap = hfs_bmap, | |
125 | .releasepage = hfs_releasepage, | |
126 | }; | |
127 | ||
f5e54d6e | 128 | const struct address_space_operations hfs_aops = { |
1da177e4 LT |
129 | .readpage = hfs_readpage, |
130 | .writepage = hfs_writepage, | |
131 | .sync_page = block_sync_page, | |
132 | .prepare_write = hfs_prepare_write, | |
133 | .commit_write = generic_commit_write, | |
134 | .bmap = hfs_bmap, | |
135 | .direct_IO = hfs_direct_IO, | |
136 | .writepages = hfs_writepages, | |
137 | }; | |
138 | ||
139 | /* | |
140 | * hfs_new_inode | |
141 | */ | |
142 | struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, int mode) | |
143 | { | |
144 | struct super_block *sb = dir->i_sb; | |
145 | struct inode *inode = new_inode(sb); | |
146 | if (!inode) | |
147 | return NULL; | |
148 | ||
149 | init_MUTEX(&HFS_I(inode)->extents_lock); | |
150 | INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); | |
328b9227 | 151 | hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name); |
1da177e4 LT |
152 | inode->i_ino = HFS_SB(sb)->next_id++; |
153 | inode->i_mode = mode; | |
154 | inode->i_uid = current->fsuid; | |
155 | inode->i_gid = current->fsgid; | |
156 | inode->i_nlink = 1; | |
157 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; | |
1da177e4 LT |
158 | HFS_I(inode)->flags = 0; |
159 | HFS_I(inode)->rsrc_inode = NULL; | |
160 | HFS_I(inode)->fs_blocks = 0; | |
161 | if (S_ISDIR(mode)) { | |
162 | inode->i_size = 2; | |
163 | HFS_SB(sb)->folder_count++; | |
164 | if (dir->i_ino == HFS_ROOT_CNID) | |
165 | HFS_SB(sb)->root_dirs++; | |
166 | inode->i_op = &hfs_dir_inode_operations; | |
167 | inode->i_fop = &hfs_dir_operations; | |
168 | inode->i_mode |= S_IRWXUGO; | |
169 | inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; | |
170 | } else if (S_ISREG(mode)) { | |
171 | HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; | |
172 | HFS_SB(sb)->file_count++; | |
173 | if (dir->i_ino == HFS_ROOT_CNID) | |
174 | HFS_SB(sb)->root_files++; | |
175 | inode->i_op = &hfs_file_inode_operations; | |
176 | inode->i_fop = &hfs_file_operations; | |
177 | inode->i_mapping->a_ops = &hfs_aops; | |
178 | inode->i_mode |= S_IRUGO|S_IXUGO; | |
179 | if (mode & S_IWUSR) | |
180 | inode->i_mode |= S_IWUGO; | |
181 | inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; | |
182 | HFS_I(inode)->phys_size = 0; | |
183 | HFS_I(inode)->alloc_blocks = 0; | |
184 | HFS_I(inode)->first_blocks = 0; | |
185 | HFS_I(inode)->cached_start = 0; | |
186 | HFS_I(inode)->cached_blocks = 0; | |
187 | memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); | |
188 | memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); | |
189 | } | |
190 | insert_inode_hash(inode); | |
191 | mark_inode_dirty(inode); | |
192 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
193 | sb->s_dirt = 1; | |
194 | ||
195 | return inode; | |
196 | } | |
197 | ||
198 | void hfs_delete_inode(struct inode *inode) | |
199 | { | |
200 | struct super_block *sb = inode->i_sb; | |
201 | ||
202 | dprint(DBG_INODE, "delete_inode: %lu\n", inode->i_ino); | |
203 | if (S_ISDIR(inode->i_mode)) { | |
204 | HFS_SB(sb)->folder_count--; | |
205 | if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) | |
206 | HFS_SB(sb)->root_dirs--; | |
207 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
208 | sb->s_dirt = 1; | |
209 | return; | |
210 | } | |
211 | HFS_SB(sb)->file_count--; | |
212 | if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) | |
213 | HFS_SB(sb)->root_files--; | |
214 | if (S_ISREG(inode->i_mode)) { | |
215 | if (!inode->i_nlink) { | |
216 | inode->i_size = 0; | |
217 | hfs_file_truncate(inode); | |
218 | } | |
219 | } | |
220 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
221 | sb->s_dirt = 1; | |
222 | } | |
223 | ||
224 | void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, | |
225 | __be32 __log_size, __be32 phys_size, u32 clump_size) | |
226 | { | |
227 | struct super_block *sb = inode->i_sb; | |
228 | u32 log_size = be32_to_cpu(__log_size); | |
229 | u16 count; | |
230 | int i; | |
231 | ||
232 | memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); | |
233 | for (count = 0, i = 0; i < 3; i++) | |
234 | count += be16_to_cpu(ext[i].count); | |
235 | HFS_I(inode)->first_blocks = count; | |
236 | ||
237 | inode->i_size = HFS_I(inode)->phys_size = log_size; | |
238 | HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
239 | inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); | |
240 | HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / | |
241 | HFS_SB(sb)->alloc_blksz; | |
242 | HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; | |
243 | if (!HFS_I(inode)->clump_blocks) | |
244 | HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; | |
245 | } | |
246 | ||
247 | struct hfs_iget_data { | |
248 | struct hfs_cat_key *key; | |
249 | hfs_cat_rec *rec; | |
250 | }; | |
251 | ||
252 | static int hfs_test_inode(struct inode *inode, void *data) | |
253 | { | |
254 | struct hfs_iget_data *idata = data; | |
255 | hfs_cat_rec *rec; | |
256 | ||
257 | rec = idata->rec; | |
258 | switch (rec->type) { | |
259 | case HFS_CDR_DIR: | |
260 | return inode->i_ino == be32_to_cpu(rec->dir.DirID); | |
261 | case HFS_CDR_FIL: | |
262 | return inode->i_ino == be32_to_cpu(rec->file.FlNum); | |
263 | default: | |
264 | BUG(); | |
265 | return 1; | |
266 | } | |
267 | } | |
268 | ||
269 | /* | |
270 | * hfs_read_inode | |
271 | */ | |
272 | static int hfs_read_inode(struct inode *inode, void *data) | |
273 | { | |
274 | struct hfs_iget_data *idata = data; | |
275 | struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); | |
276 | hfs_cat_rec *rec; | |
277 | ||
278 | HFS_I(inode)->flags = 0; | |
279 | HFS_I(inode)->rsrc_inode = NULL; | |
280 | init_MUTEX(&HFS_I(inode)->extents_lock); | |
281 | INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); | |
282 | ||
283 | /* Initialize the inode */ | |
284 | inode->i_uid = hsb->s_uid; | |
285 | inode->i_gid = hsb->s_gid; | |
286 | inode->i_nlink = 1; | |
1da177e4 LT |
287 | |
288 | if (idata->key) | |
289 | HFS_I(inode)->cat_key = *idata->key; | |
290 | else | |
291 | HFS_I(inode)->flags |= HFS_FLG_RSRC; | |
292 | HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; | |
293 | ||
294 | rec = idata->rec; | |
295 | switch (rec->type) { | |
296 | case HFS_CDR_FIL: | |
297 | if (!HFS_IS_RSRC(inode)) { | |
298 | hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, | |
299 | rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); | |
300 | } else { | |
301 | hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, | |
302 | rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); | |
303 | } | |
304 | ||
305 | inode->i_ino = be32_to_cpu(rec->file.FlNum); | |
306 | inode->i_mode = S_IRUGO | S_IXUGO; | |
307 | if (!(rec->file.Flags & HFS_FIL_LOCK)) | |
308 | inode->i_mode |= S_IWUGO; | |
309 | inode->i_mode &= ~hsb->s_file_umask; | |
310 | inode->i_mode |= S_IFREG; | |
311 | inode->i_ctime = inode->i_atime = inode->i_mtime = | |
312 | hfs_m_to_utime(rec->file.MdDat); | |
313 | inode->i_op = &hfs_file_inode_operations; | |
314 | inode->i_fop = &hfs_file_operations; | |
315 | inode->i_mapping->a_ops = &hfs_aops; | |
316 | break; | |
317 | case HFS_CDR_DIR: | |
318 | inode->i_ino = be32_to_cpu(rec->dir.DirID); | |
319 | inode->i_size = be16_to_cpu(rec->dir.Val) + 2; | |
320 | HFS_I(inode)->fs_blocks = 0; | |
321 | inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); | |
322 | inode->i_ctime = inode->i_atime = inode->i_mtime = | |
323 | hfs_m_to_utime(rec->dir.MdDat); | |
324 | inode->i_op = &hfs_dir_inode_operations; | |
325 | inode->i_fop = &hfs_dir_operations; | |
326 | break; | |
327 | default: | |
328 | make_bad_inode(inode); | |
329 | } | |
330 | return 0; | |
331 | } | |
332 | ||
333 | /* | |
334 | * __hfs_iget() | |
335 | * | |
336 | * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in | |
337 | * the catalog B-tree and the 'type' of the desired file return the | |
338 | * inode for that file/directory or NULL. Note that 'type' indicates | |
339 | * whether we want the actual file or directory, or the corresponding | |
340 | * metadata (AppleDouble header file or CAP metadata file). | |
341 | */ | |
342 | struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) | |
343 | { | |
344 | struct hfs_iget_data data = { key, rec }; | |
345 | struct inode *inode; | |
346 | u32 cnid; | |
347 | ||
348 | switch (rec->type) { | |
349 | case HFS_CDR_DIR: | |
350 | cnid = be32_to_cpu(rec->dir.DirID); | |
351 | break; | |
352 | case HFS_CDR_FIL: | |
353 | cnid = be32_to_cpu(rec->file.FlNum); | |
354 | break; | |
355 | default: | |
356 | return NULL; | |
357 | } | |
358 | inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); | |
359 | if (inode && (inode->i_state & I_NEW)) | |
360 | unlock_new_inode(inode); | |
361 | return inode; | |
362 | } | |
363 | ||
364 | void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, | |
365 | __be32 *log_size, __be32 *phys_size) | |
366 | { | |
367 | memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); | |
368 | ||
369 | if (log_size) | |
370 | *log_size = cpu_to_be32(inode->i_size); | |
371 | if (phys_size) | |
372 | *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * | |
373 | HFS_SB(inode->i_sb)->alloc_blksz); | |
374 | } | |
375 | ||
376 | int hfs_write_inode(struct inode *inode, int unused) | |
377 | { | |
378 | struct inode *main_inode = inode; | |
379 | struct hfs_find_data fd; | |
380 | hfs_cat_rec rec; | |
381 | ||
382 | dprint(DBG_INODE, "hfs_write_inode: %lu\n", inode->i_ino); | |
383 | hfs_ext_write_extent(inode); | |
384 | ||
385 | if (inode->i_ino < HFS_FIRSTUSER_CNID) { | |
386 | switch (inode->i_ino) { | |
387 | case HFS_ROOT_CNID: | |
388 | break; | |
389 | case HFS_EXT_CNID: | |
390 | hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); | |
391 | return 0; | |
392 | case HFS_CAT_CNID: | |
393 | hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); | |
394 | return 0; | |
395 | default: | |
396 | BUG(); | |
397 | return -EIO; | |
398 | } | |
399 | } | |
400 | ||
401 | if (HFS_IS_RSRC(inode)) | |
402 | main_inode = HFS_I(inode)->rsrc_inode; | |
403 | ||
404 | if (!main_inode->i_nlink) | |
405 | return 0; | |
406 | ||
407 | if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) | |
408 | /* panic? */ | |
409 | return -EIO; | |
410 | ||
411 | fd.search_key->cat = HFS_I(main_inode)->cat_key; | |
412 | if (hfs_brec_find(&fd)) | |
413 | /* panic? */ | |
414 | goto out; | |
415 | ||
416 | if (S_ISDIR(main_inode->i_mode)) { | |
417 | if (fd.entrylength < sizeof(struct hfs_cat_dir)) | |
418 | /* panic? */; | |
419 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
420 | sizeof(struct hfs_cat_dir)); | |
421 | if (rec.type != HFS_CDR_DIR || | |
422 | be32_to_cpu(rec.dir.DirID) != inode->i_ino) { | |
423 | } | |
424 | ||
425 | rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime); | |
426 | rec.dir.Val = cpu_to_be16(inode->i_size - 2); | |
427 | ||
428 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
429 | sizeof(struct hfs_cat_dir)); | |
430 | } else if (HFS_IS_RSRC(inode)) { | |
431 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
432 | sizeof(struct hfs_cat_file)); | |
433 | hfs_inode_write_fork(inode, rec.file.RExtRec, | |
434 | &rec.file.RLgLen, &rec.file.RPyLen); | |
435 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
436 | sizeof(struct hfs_cat_file)); | |
437 | } else { | |
438 | if (fd.entrylength < sizeof(struct hfs_cat_file)) | |
439 | /* panic? */; | |
440 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
441 | sizeof(struct hfs_cat_file)); | |
442 | if (rec.type != HFS_CDR_FIL || | |
443 | be32_to_cpu(rec.file.FlNum) != inode->i_ino) { | |
444 | } | |
445 | ||
446 | if (inode->i_mode & S_IWUSR) | |
447 | rec.file.Flags &= ~HFS_FIL_LOCK; | |
448 | else | |
449 | rec.file.Flags |= HFS_FIL_LOCK; | |
450 | hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); | |
451 | rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime); | |
452 | ||
453 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
454 | sizeof(struct hfs_cat_file)); | |
455 | } | |
456 | out: | |
457 | hfs_find_exit(&fd); | |
458 | return 0; | |
459 | } | |
460 | ||
461 | static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, | |
462 | struct nameidata *nd) | |
463 | { | |
464 | struct inode *inode = NULL; | |
465 | hfs_cat_rec rec; | |
466 | struct hfs_find_data fd; | |
467 | int res; | |
468 | ||
469 | if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) | |
470 | goto out; | |
471 | ||
472 | inode = HFS_I(dir)->rsrc_inode; | |
473 | if (inode) | |
474 | goto out; | |
475 | ||
476 | inode = new_inode(dir->i_sb); | |
477 | if (!inode) | |
478 | return ERR_PTR(-ENOMEM); | |
479 | ||
480 | hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); | |
481 | fd.search_key->cat = HFS_I(dir)->cat_key; | |
482 | res = hfs_brec_read(&fd, &rec, sizeof(rec)); | |
483 | if (!res) { | |
484 | struct hfs_iget_data idata = { NULL, &rec }; | |
485 | hfs_read_inode(inode, &idata); | |
486 | } | |
487 | hfs_find_exit(&fd); | |
488 | if (res) { | |
489 | iput(inode); | |
490 | return ERR_PTR(res); | |
491 | } | |
492 | HFS_I(inode)->rsrc_inode = dir; | |
493 | HFS_I(dir)->rsrc_inode = inode; | |
494 | igrab(dir); | |
495 | hlist_add_head(&inode->i_hash, &HFS_SB(dir->i_sb)->rsrc_inodes); | |
496 | mark_inode_dirty(inode); | |
497 | out: | |
498 | d_add(dentry, inode); | |
499 | return NULL; | |
500 | } | |
501 | ||
502 | void hfs_clear_inode(struct inode *inode) | |
503 | { | |
504 | if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { | |
505 | HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; | |
506 | iput(HFS_I(inode)->rsrc_inode); | |
507 | } | |
508 | } | |
509 | ||
510 | static int hfs_permission(struct inode *inode, int mask, | |
511 | struct nameidata *nd) | |
512 | { | |
513 | if (S_ISREG(inode->i_mode) && mask & MAY_EXEC) | |
514 | return 0; | |
515 | return generic_permission(inode, mask, NULL); | |
516 | } | |
517 | ||
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; | |
522 | if (atomic_read(&file->f_count) != 1) | |
523 | return 0; | |
524 | atomic_inc(&HFS_I(inode)->opencnt); | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static int hfs_file_release(struct inode *inode, struct file *file) | |
529 | { | |
530 | //struct super_block *sb = inode->i_sb; | |
531 | ||
532 | if (HFS_IS_RSRC(inode)) | |
533 | inode = HFS_I(inode)->rsrc_inode; | |
534 | if (atomic_read(&file->f_count) != 0) | |
535 | return 0; | |
536 | if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { | |
1b1dcc1b | 537 | mutex_lock(&inode->i_mutex); |
1da177e4 LT |
538 | hfs_file_truncate(inode); |
539 | //if (inode->i_flags & S_DEAD) { | |
540 | // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); | |
541 | // hfs_delete_inode(inode); | |
542 | //} | |
1b1dcc1b | 543 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
544 | } |
545 | return 0; | |
546 | } | |
547 | ||
548 | /* | |
549 | * hfs_notify_change() | |
550 | * | |
551 | * Based very closely on fs/msdos/inode.c by Werner Almesberger | |
552 | * | |
553 | * This is the notify_change() field in the super_operations structure | |
554 | * for HFS file systems. The purpose is to take that changes made to | |
555 | * an inode and apply then in a filesystem-dependent manner. In this | |
556 | * case the process has a few of tasks to do: | |
557 | * 1) prevent changes to the i_uid and i_gid fields. | |
558 | * 2) map file permissions to the closest allowable permissions | |
559 | * 3) Since multiple Linux files can share the same on-disk inode under | |
560 | * HFS (for instance the data and resource forks of a file) a change | |
561 | * to permissions must be applied to all other in-core inodes which | |
562 | * correspond to the same HFS file. | |
563 | */ | |
564 | ||
565 | int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr) | |
566 | { | |
567 | struct inode *inode = dentry->d_inode; | |
568 | struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); | |
569 | int error; | |
570 | ||
571 | error = inode_change_ok(inode, attr); /* basic permission checks */ | |
572 | if (error) | |
573 | return error; | |
574 | ||
575 | /* no uig/gid changes and limit which mode bits can be set */ | |
576 | if (((attr->ia_valid & ATTR_UID) && | |
577 | (attr->ia_uid != hsb->s_uid)) || | |
578 | ((attr->ia_valid & ATTR_GID) && | |
579 | (attr->ia_gid != hsb->s_gid)) || | |
580 | ((attr->ia_valid & ATTR_MODE) && | |
581 | ((S_ISDIR(inode->i_mode) && | |
582 | (attr->ia_mode != inode->i_mode)) || | |
583 | (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { | |
584 | return hsb->s_quiet ? 0 : error; | |
585 | } | |
586 | ||
587 | if (attr->ia_valid & ATTR_MODE) { | |
588 | /* Only the 'w' bits can ever change and only all together. */ | |
589 | if (attr->ia_mode & S_IWUSR) | |
590 | attr->ia_mode = inode->i_mode | S_IWUGO; | |
591 | else | |
592 | attr->ia_mode = inode->i_mode & ~S_IWUGO; | |
593 | attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; | |
594 | } | |
595 | error = inode_setattr(inode, attr); | |
596 | if (error) | |
597 | return error; | |
598 | ||
599 | return 0; | |
600 | } | |
601 | ||
602 | ||
4b6f5d20 | 603 | static const struct file_operations hfs_file_operations = { |
1da177e4 | 604 | .llseek = generic_file_llseek, |
543ade1f BP |
605 | .read = do_sync_read, |
606 | .aio_read = generic_file_aio_read, | |
607 | .write = do_sync_write, | |
608 | .aio_write = generic_file_aio_write, | |
1da177e4 LT |
609 | .mmap = generic_file_mmap, |
610 | .sendfile = generic_file_sendfile, | |
611 | .fsync = file_fsync, | |
612 | .open = hfs_file_open, | |
613 | .release = hfs_file_release, | |
614 | }; | |
615 | ||
92e1d5be | 616 | static const struct inode_operations hfs_file_inode_operations = { |
1da177e4 LT |
617 | .lookup = hfs_file_lookup, |
618 | .truncate = hfs_file_truncate, | |
619 | .setattr = hfs_inode_setattr, | |
620 | .permission = hfs_permission, | |
621 | .setxattr = hfs_setxattr, | |
622 | .getxattr = hfs_getxattr, | |
623 | .listxattr = hfs_listxattr, | |
624 | }; |