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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> |
5b825c3a | 17 | #include <linux/cred.h> |
e2e40f2c | 18 | #include <linux/uio.h> |
b8020eff | 19 | #include <linux/xattr.h> |
3f1266f1 | 20 | #include <linux/blkdev.h> |
1da177e4 LT |
21 | |
22 | #include "hfs_fs.h" | |
23 | #include "btree.h" | |
24 | ||
4b6f5d20 | 25 | static const struct file_operations hfs_file_operations; |
92e1d5be | 26 | static const struct inode_operations hfs_file_inode_operations; |
1da177e4 LT |
27 | |
28 | /*================ Variable-like macros ================*/ | |
29 | ||
30 | #define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO) | |
31 | ||
32 | static int hfs_writepage(struct page *page, struct writeback_control *wbc) | |
33 | { | |
34 | return block_write_full_page(page, hfs_get_block, wbc); | |
35 | } | |
36 | ||
37 | static int hfs_readpage(struct file *file, struct page *page) | |
38 | { | |
39 | return block_read_full_page(page, hfs_get_block); | |
40 | } | |
41 | ||
c8cf464b MS |
42 | static void hfs_write_failed(struct address_space *mapping, loff_t to) |
43 | { | |
44 | struct inode *inode = mapping->host; | |
45 | ||
46 | if (to > inode->i_size) { | |
7caef267 | 47 | truncate_pagecache(inode, inode->i_size); |
c8cf464b MS |
48 | hfs_file_truncate(inode); |
49 | } | |
50 | } | |
51 | ||
7903d9ee NP |
52 | static int hfs_write_begin(struct file *file, struct address_space *mapping, |
53 | loff_t pos, unsigned len, unsigned flags, | |
54 | struct page **pagep, void **fsdata) | |
1da177e4 | 55 | { |
282dc178 CH |
56 | int ret; |
57 | ||
7903d9ee | 58 | *pagep = NULL; |
282dc178 | 59 | ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
7903d9ee NP |
60 | hfs_get_block, |
61 | &HFS_I(mapping->host)->phys_size); | |
c8cf464b MS |
62 | if (unlikely(ret)) |
63 | hfs_write_failed(mapping, pos + len); | |
282dc178 CH |
64 | |
65 | return ret; | |
1da177e4 LT |
66 | } |
67 | ||
68 | static sector_t hfs_bmap(struct address_space *mapping, sector_t block) | |
69 | { | |
70 | return generic_block_bmap(mapping, block, hfs_get_block); | |
71 | } | |
72 | ||
27496a8c | 73 | static int hfs_releasepage(struct page *page, gfp_t mask) |
1da177e4 LT |
74 | { |
75 | struct inode *inode = page->mapping->host; | |
76 | struct super_block *sb = inode->i_sb; | |
77 | struct hfs_btree *tree; | |
78 | struct hfs_bnode *node; | |
79 | u32 nidx; | |
80 | int i, res = 1; | |
81 | ||
82 | switch (inode->i_ino) { | |
83 | case HFS_EXT_CNID: | |
84 | tree = HFS_SB(sb)->ext_tree; | |
85 | break; | |
86 | case HFS_CAT_CNID: | |
87 | tree = HFS_SB(sb)->cat_tree; | |
88 | break; | |
89 | default: | |
90 | BUG(); | |
91 | return 0; | |
92 | } | |
eb2e5f45 DA |
93 | |
94 | if (!tree) | |
95 | return 0; | |
96 | ||
09cbfeaf KS |
97 | if (tree->node_size >= PAGE_SIZE) { |
98 | nidx = page->index >> (tree->node_size_shift - PAGE_SHIFT); | |
1da177e4 LT |
99 | spin_lock(&tree->hash_lock); |
100 | node = hfs_bnode_findhash(tree, nidx); | |
101 | if (!node) | |
102 | ; | |
103 | else if (atomic_read(&node->refcnt)) | |
104 | res = 0; | |
105 | if (res && node) { | |
106 | hfs_bnode_unhash(node); | |
107 | hfs_bnode_free(node); | |
108 | } | |
109 | spin_unlock(&tree->hash_lock); | |
110 | } else { | |
09cbfeaf KS |
111 | nidx = page->index << (PAGE_SHIFT - tree->node_size_shift); |
112 | i = 1 << (PAGE_SHIFT - tree->node_size_shift); | |
1da177e4 LT |
113 | spin_lock(&tree->hash_lock); |
114 | do { | |
115 | node = hfs_bnode_findhash(tree, nidx++); | |
116 | if (!node) | |
117 | continue; | |
118 | if (atomic_read(&node->refcnt)) { | |
119 | res = 0; | |
120 | break; | |
121 | } | |
122 | hfs_bnode_unhash(node); | |
123 | hfs_bnode_free(node); | |
124 | } while (--i && nidx < tree->node_count); | |
125 | spin_unlock(&tree->hash_lock); | |
126 | } | |
1da177e4 LT |
127 | return res ? try_to_free_buffers(page) : 0; |
128 | } | |
129 | ||
c8b8e32d | 130 | static ssize_t hfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
1da177e4 LT |
131 | { |
132 | struct file *file = iocb->ki_filp; | |
c8cf464b | 133 | struct address_space *mapping = file->f_mapping; |
93c76a3d | 134 | struct inode *inode = mapping->host; |
a6cbcd4a | 135 | size_t count = iov_iter_count(iter); |
eafdc7d1 | 136 | ssize_t ret; |
1da177e4 | 137 | |
c8b8e32d | 138 | ret = blockdev_direct_IO(iocb, inode, iter, hfs_get_block); |
eafdc7d1 CH |
139 | |
140 | /* | |
141 | * In case of error extending write may have instantiated a few | |
142 | * blocks outside i_size. Trim these off again. | |
143 | */ | |
6f673763 | 144 | if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { |
eafdc7d1 | 145 | loff_t isize = i_size_read(inode); |
c8b8e32d | 146 | loff_t end = iocb->ki_pos + count; |
eafdc7d1 CH |
147 | |
148 | if (end > isize) | |
c8cf464b | 149 | hfs_write_failed(mapping, end); |
eafdc7d1 CH |
150 | } |
151 | ||
152 | return ret; | |
1da177e4 LT |
153 | } |
154 | ||
155 | static int hfs_writepages(struct address_space *mapping, | |
156 | struct writeback_control *wbc) | |
157 | { | |
158 | return mpage_writepages(mapping, wbc, hfs_get_block); | |
159 | } | |
160 | ||
f5e54d6e | 161 | const struct address_space_operations hfs_btree_aops = { |
0af57378 | 162 | .set_page_dirty = __set_page_dirty_buffers, |
1da177e4 LT |
163 | .readpage = hfs_readpage, |
164 | .writepage = hfs_writepage, | |
7903d9ee NP |
165 | .write_begin = hfs_write_begin, |
166 | .write_end = generic_write_end, | |
1da177e4 LT |
167 | .bmap = hfs_bmap, |
168 | .releasepage = hfs_releasepage, | |
169 | }; | |
170 | ||
f5e54d6e | 171 | const struct address_space_operations hfs_aops = { |
0af57378 | 172 | .set_page_dirty = __set_page_dirty_buffers, |
1da177e4 LT |
173 | .readpage = hfs_readpage, |
174 | .writepage = hfs_writepage, | |
7903d9ee NP |
175 | .write_begin = hfs_write_begin, |
176 | .write_end = generic_write_end, | |
1da177e4 LT |
177 | .bmap = hfs_bmap, |
178 | .direct_IO = hfs_direct_IO, | |
179 | .writepages = hfs_writepages, | |
180 | }; | |
181 | ||
182 | /* | |
183 | * hfs_new_inode | |
184 | */ | |
71e93963 | 185 | struct inode *hfs_new_inode(struct inode *dir, const struct qstr *name, umode_t mode) |
1da177e4 LT |
186 | { |
187 | struct super_block *sb = dir->i_sb; | |
188 | struct inode *inode = new_inode(sb); | |
189 | if (!inode) | |
190 | return NULL; | |
191 | ||
39f8d472 | 192 | mutex_init(&HFS_I(inode)->extents_lock); |
1da177e4 | 193 | INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); |
9717a91b | 194 | spin_lock_init(&HFS_I(inode)->open_dir_lock); |
328b9227 | 195 | hfs_cat_build_key(sb, (btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name); |
1da177e4 LT |
196 | inode->i_ino = HFS_SB(sb)->next_id++; |
197 | inode->i_mode = mode; | |
94c9a5ee DH |
198 | inode->i_uid = current_fsuid(); |
199 | inode->i_gid = current_fsgid(); | |
bfe86848 | 200 | set_nlink(inode, 1); |
02027d42 | 201 | inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
1da177e4 LT |
202 | HFS_I(inode)->flags = 0; |
203 | HFS_I(inode)->rsrc_inode = NULL; | |
204 | HFS_I(inode)->fs_blocks = 0; | |
205 | if (S_ISDIR(mode)) { | |
206 | inode->i_size = 2; | |
207 | HFS_SB(sb)->folder_count++; | |
208 | if (dir->i_ino == HFS_ROOT_CNID) | |
209 | HFS_SB(sb)->root_dirs++; | |
210 | inode->i_op = &hfs_dir_inode_operations; | |
211 | inode->i_fop = &hfs_dir_operations; | |
212 | inode->i_mode |= S_IRWXUGO; | |
213 | inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; | |
214 | } else if (S_ISREG(mode)) { | |
215 | HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; | |
216 | HFS_SB(sb)->file_count++; | |
217 | if (dir->i_ino == HFS_ROOT_CNID) | |
218 | HFS_SB(sb)->root_files++; | |
219 | inode->i_op = &hfs_file_inode_operations; | |
220 | inode->i_fop = &hfs_file_operations; | |
221 | inode->i_mapping->a_ops = &hfs_aops; | |
222 | inode->i_mode |= S_IRUGO|S_IXUGO; | |
223 | if (mode & S_IWUSR) | |
224 | inode->i_mode |= S_IWUGO; | |
225 | inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; | |
226 | HFS_I(inode)->phys_size = 0; | |
227 | HFS_I(inode)->alloc_blocks = 0; | |
228 | HFS_I(inode)->first_blocks = 0; | |
229 | HFS_I(inode)->cached_start = 0; | |
230 | HFS_I(inode)->cached_blocks = 0; | |
231 | memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); | |
232 | memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); | |
233 | } | |
234 | insert_inode_hash(inode); | |
235 | mark_inode_dirty(inode); | |
236 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
5687b578 | 237 | hfs_mark_mdb_dirty(sb); |
1da177e4 LT |
238 | |
239 | return inode; | |
240 | } | |
241 | ||
242 | void hfs_delete_inode(struct inode *inode) | |
243 | { | |
244 | struct super_block *sb = inode->i_sb; | |
245 | ||
c2b3e1f7 | 246 | hfs_dbg(INODE, "delete_inode: %lu\n", inode->i_ino); |
1da177e4 LT |
247 | if (S_ISDIR(inode->i_mode)) { |
248 | HFS_SB(sb)->folder_count--; | |
249 | if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) | |
250 | HFS_SB(sb)->root_dirs--; | |
251 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
5687b578 | 252 | hfs_mark_mdb_dirty(sb); |
1da177e4 LT |
253 | return; |
254 | } | |
255 | HFS_SB(sb)->file_count--; | |
256 | if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) | |
257 | HFS_SB(sb)->root_files--; | |
258 | if (S_ISREG(inode->i_mode)) { | |
259 | if (!inode->i_nlink) { | |
260 | inode->i_size = 0; | |
261 | hfs_file_truncate(inode); | |
262 | } | |
263 | } | |
264 | set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); | |
5687b578 | 265 | hfs_mark_mdb_dirty(sb); |
1da177e4 LT |
266 | } |
267 | ||
268 | void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, | |
269 | __be32 __log_size, __be32 phys_size, u32 clump_size) | |
270 | { | |
271 | struct super_block *sb = inode->i_sb; | |
272 | u32 log_size = be32_to_cpu(__log_size); | |
273 | u16 count; | |
274 | int i; | |
275 | ||
276 | memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); | |
277 | for (count = 0, i = 0; i < 3; i++) | |
278 | count += be16_to_cpu(ext[i].count); | |
279 | HFS_I(inode)->first_blocks = count; | |
280 | ||
281 | inode->i_size = HFS_I(inode)->phys_size = log_size; | |
282 | HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; | |
283 | inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); | |
284 | HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / | |
285 | HFS_SB(sb)->alloc_blksz; | |
286 | HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; | |
287 | if (!HFS_I(inode)->clump_blocks) | |
288 | HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; | |
289 | } | |
290 | ||
291 | struct hfs_iget_data { | |
292 | struct hfs_cat_key *key; | |
293 | hfs_cat_rec *rec; | |
294 | }; | |
295 | ||
296 | static int hfs_test_inode(struct inode *inode, void *data) | |
297 | { | |
298 | struct hfs_iget_data *idata = data; | |
299 | hfs_cat_rec *rec; | |
300 | ||
301 | rec = idata->rec; | |
302 | switch (rec->type) { | |
303 | case HFS_CDR_DIR: | |
304 | return inode->i_ino == be32_to_cpu(rec->dir.DirID); | |
305 | case HFS_CDR_FIL: | |
306 | return inode->i_ino == be32_to_cpu(rec->file.FlNum); | |
307 | default: | |
308 | BUG(); | |
309 | return 1; | |
310 | } | |
311 | } | |
312 | ||
313 | /* | |
314 | * hfs_read_inode | |
315 | */ | |
316 | static int hfs_read_inode(struct inode *inode, void *data) | |
317 | { | |
318 | struct hfs_iget_data *idata = data; | |
319 | struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); | |
320 | hfs_cat_rec *rec; | |
321 | ||
322 | HFS_I(inode)->flags = 0; | |
323 | HFS_I(inode)->rsrc_inode = NULL; | |
39f8d472 | 324 | mutex_init(&HFS_I(inode)->extents_lock); |
1da177e4 | 325 | INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); |
9717a91b | 326 | spin_lock_init(&HFS_I(inode)->open_dir_lock); |
1da177e4 LT |
327 | |
328 | /* Initialize the inode */ | |
329 | inode->i_uid = hsb->s_uid; | |
330 | inode->i_gid = hsb->s_gid; | |
bfe86848 | 331 | set_nlink(inode, 1); |
1da177e4 LT |
332 | |
333 | if (idata->key) | |
334 | HFS_I(inode)->cat_key = *idata->key; | |
335 | else | |
336 | HFS_I(inode)->flags |= HFS_FLG_RSRC; | |
337 | HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; | |
338 | ||
339 | rec = idata->rec; | |
340 | switch (rec->type) { | |
341 | case HFS_CDR_FIL: | |
342 | if (!HFS_IS_RSRC(inode)) { | |
343 | hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, | |
344 | rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); | |
345 | } else { | |
346 | hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, | |
347 | rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); | |
348 | } | |
349 | ||
350 | inode->i_ino = be32_to_cpu(rec->file.FlNum); | |
351 | inode->i_mode = S_IRUGO | S_IXUGO; | |
352 | if (!(rec->file.Flags & HFS_FIL_LOCK)) | |
353 | inode->i_mode |= S_IWUGO; | |
354 | inode->i_mode &= ~hsb->s_file_umask; | |
355 | inode->i_mode |= S_IFREG; | |
356 | inode->i_ctime = inode->i_atime = inode->i_mtime = | |
4ddfc3dc | 357 | hfs_m_to_utime(rec->file.MdDat); |
1da177e4 LT |
358 | inode->i_op = &hfs_file_inode_operations; |
359 | inode->i_fop = &hfs_file_operations; | |
360 | inode->i_mapping->a_ops = &hfs_aops; | |
361 | break; | |
362 | case HFS_CDR_DIR: | |
363 | inode->i_ino = be32_to_cpu(rec->dir.DirID); | |
364 | inode->i_size = be16_to_cpu(rec->dir.Val) + 2; | |
365 | HFS_I(inode)->fs_blocks = 0; | |
366 | inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); | |
367 | inode->i_ctime = inode->i_atime = inode->i_mtime = | |
4ddfc3dc | 368 | hfs_m_to_utime(rec->dir.MdDat); |
1da177e4 LT |
369 | inode->i_op = &hfs_dir_inode_operations; |
370 | inode->i_fop = &hfs_dir_operations; | |
371 | break; | |
372 | default: | |
373 | make_bad_inode(inode); | |
374 | } | |
375 | return 0; | |
376 | } | |
377 | ||
378 | /* | |
379 | * __hfs_iget() | |
380 | * | |
381 | * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in | |
382 | * the catalog B-tree and the 'type' of the desired file return the | |
383 | * inode for that file/directory or NULL. Note that 'type' indicates | |
384 | * whether we want the actual file or directory, or the corresponding | |
385 | * metadata (AppleDouble header file or CAP metadata file). | |
386 | */ | |
387 | struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) | |
388 | { | |
389 | struct hfs_iget_data data = { key, rec }; | |
390 | struct inode *inode; | |
391 | u32 cnid; | |
392 | ||
393 | switch (rec->type) { | |
394 | case HFS_CDR_DIR: | |
395 | cnid = be32_to_cpu(rec->dir.DirID); | |
396 | break; | |
397 | case HFS_CDR_FIL: | |
398 | cnid = be32_to_cpu(rec->file.FlNum); | |
399 | break; | |
400 | default: | |
401 | return NULL; | |
402 | } | |
403 | inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); | |
404 | if (inode && (inode->i_state & I_NEW)) | |
405 | unlock_new_inode(inode); | |
406 | return inode; | |
407 | } | |
408 | ||
409 | void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, | |
410 | __be32 *log_size, __be32 *phys_size) | |
411 | { | |
412 | memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); | |
413 | ||
414 | if (log_size) | |
415 | *log_size = cpu_to_be32(inode->i_size); | |
416 | if (phys_size) | |
417 | *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * | |
418 | HFS_SB(inode->i_sb)->alloc_blksz); | |
419 | } | |
420 | ||
a9185b41 | 421 | int hfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 LT |
422 | { |
423 | struct inode *main_inode = inode; | |
424 | struct hfs_find_data fd; | |
425 | hfs_cat_rec rec; | |
9509f178 | 426 | int res; |
1da177e4 | 427 | |
c2b3e1f7 | 428 | hfs_dbg(INODE, "hfs_write_inode: %lu\n", inode->i_ino); |
9509f178 AK |
429 | res = hfs_ext_write_extent(inode); |
430 | if (res) | |
431 | return res; | |
1da177e4 LT |
432 | |
433 | if (inode->i_ino < HFS_FIRSTUSER_CNID) { | |
434 | switch (inode->i_ino) { | |
435 | case HFS_ROOT_CNID: | |
436 | break; | |
437 | case HFS_EXT_CNID: | |
438 | hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); | |
439 | return 0; | |
440 | case HFS_CAT_CNID: | |
441 | hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); | |
442 | return 0; | |
443 | default: | |
444 | BUG(); | |
445 | return -EIO; | |
446 | } | |
447 | } | |
448 | ||
449 | if (HFS_IS_RSRC(inode)) | |
450 | main_inode = HFS_I(inode)->rsrc_inode; | |
451 | ||
452 | if (!main_inode->i_nlink) | |
453 | return 0; | |
454 | ||
455 | if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) | |
456 | /* panic? */ | |
457 | return -EIO; | |
458 | ||
459 | fd.search_key->cat = HFS_I(main_inode)->cat_key; | |
460 | if (hfs_brec_find(&fd)) | |
461 | /* panic? */ | |
462 | goto out; | |
463 | ||
464 | if (S_ISDIR(main_inode->i_mode)) { | |
465 | if (fd.entrylength < sizeof(struct hfs_cat_dir)) | |
466 | /* panic? */; | |
467 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
468 | sizeof(struct hfs_cat_dir)); | |
469 | if (rec.type != HFS_CDR_DIR || | |
470 | be32_to_cpu(rec.dir.DirID) != inode->i_ino) { | |
471 | } | |
472 | ||
473 | rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime); | |
474 | rec.dir.Val = cpu_to_be16(inode->i_size - 2); | |
475 | ||
476 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
477 | sizeof(struct hfs_cat_dir)); | |
478 | } else if (HFS_IS_RSRC(inode)) { | |
479 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
480 | sizeof(struct hfs_cat_file)); | |
481 | hfs_inode_write_fork(inode, rec.file.RExtRec, | |
482 | &rec.file.RLgLen, &rec.file.RPyLen); | |
483 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
484 | sizeof(struct hfs_cat_file)); | |
485 | } else { | |
486 | if (fd.entrylength < sizeof(struct hfs_cat_file)) | |
487 | /* panic? */; | |
488 | hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, | |
489 | sizeof(struct hfs_cat_file)); | |
490 | if (rec.type != HFS_CDR_FIL || | |
491 | be32_to_cpu(rec.file.FlNum) != inode->i_ino) { | |
492 | } | |
493 | ||
494 | if (inode->i_mode & S_IWUSR) | |
495 | rec.file.Flags &= ~HFS_FIL_LOCK; | |
496 | else | |
497 | rec.file.Flags |= HFS_FIL_LOCK; | |
498 | hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); | |
499 | rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime); | |
500 | ||
501 | hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, | |
502 | sizeof(struct hfs_cat_file)); | |
503 | } | |
504 | out: | |
505 | hfs_find_exit(&fd); | |
506 | return 0; | |
507 | } | |
508 | ||
509 | static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 510 | unsigned int flags) |
1da177e4 LT |
511 | { |
512 | struct inode *inode = NULL; | |
513 | hfs_cat_rec rec; | |
514 | struct hfs_find_data fd; | |
515 | int res; | |
516 | ||
517 | if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) | |
518 | goto out; | |
519 | ||
520 | inode = HFS_I(dir)->rsrc_inode; | |
521 | if (inode) | |
522 | goto out; | |
523 | ||
524 | inode = new_inode(dir->i_sb); | |
525 | if (!inode) | |
526 | return ERR_PTR(-ENOMEM); | |
527 | ||
9509f178 AK |
528 | res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); |
529 | if (res) { | |
530 | iput(inode); | |
531 | return ERR_PTR(res); | |
532 | } | |
1da177e4 LT |
533 | fd.search_key->cat = HFS_I(dir)->cat_key; |
534 | res = hfs_brec_read(&fd, &rec, sizeof(rec)); | |
535 | if (!res) { | |
536 | struct hfs_iget_data idata = { NULL, &rec }; | |
537 | hfs_read_inode(inode, &idata); | |
538 | } | |
539 | hfs_find_exit(&fd); | |
540 | if (res) { | |
541 | iput(inode); | |
542 | return ERR_PTR(res); | |
543 | } | |
544 | HFS_I(inode)->rsrc_inode = dir; | |
545 | HFS_I(dir)->rsrc_inode = inode; | |
546 | igrab(dir); | |
5bef9151 | 547 | inode_fake_hash(inode); |
1da177e4 | 548 | mark_inode_dirty(inode); |
0e5c56fd | 549 | dont_mount(dentry); |
1da177e4 | 550 | out: |
6b9cceea | 551 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
552 | } |
553 | ||
b57922d9 | 554 | void hfs_evict_inode(struct inode *inode) |
1da177e4 | 555 | { |
91b0abe3 | 556 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 557 | clear_inode(inode); |
1da177e4 LT |
558 | if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { |
559 | HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; | |
560 | iput(HFS_I(inode)->rsrc_inode); | |
561 | } | |
562 | } | |
563 | ||
1da177e4 LT |
564 | static int hfs_file_open(struct inode *inode, struct file *file) |
565 | { | |
566 | if (HFS_IS_RSRC(inode)) | |
567 | inode = HFS_I(inode)->rsrc_inode; | |
1da177e4 LT |
568 | atomic_inc(&HFS_I(inode)->opencnt); |
569 | return 0; | |
570 | } | |
571 | ||
572 | static int hfs_file_release(struct inode *inode, struct file *file) | |
573 | { | |
574 | //struct super_block *sb = inode->i_sb; | |
575 | ||
576 | if (HFS_IS_RSRC(inode)) | |
577 | inode = HFS_I(inode)->rsrc_inode; | |
1da177e4 | 578 | if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { |
5955102c | 579 | inode_lock(inode); |
1da177e4 LT |
580 | hfs_file_truncate(inode); |
581 | //if (inode->i_flags & S_DEAD) { | |
582 | // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); | |
583 | // hfs_delete_inode(inode); | |
584 | //} | |
5955102c | 585 | inode_unlock(inode); |
1da177e4 LT |
586 | } |
587 | return 0; | |
588 | } | |
589 | ||
590 | /* | |
591 | * hfs_notify_change() | |
592 | * | |
593 | * Based very closely on fs/msdos/inode.c by Werner Almesberger | |
594 | * | |
595 | * This is the notify_change() field in the super_operations structure | |
596 | * for HFS file systems. The purpose is to take that changes made to | |
597 | * an inode and apply then in a filesystem-dependent manner. In this | |
598 | * case the process has a few of tasks to do: | |
599 | * 1) prevent changes to the i_uid and i_gid fields. | |
600 | * 2) map file permissions to the closest allowable permissions | |
601 | * 3) Since multiple Linux files can share the same on-disk inode under | |
602 | * HFS (for instance the data and resource forks of a file) a change | |
603 | * to permissions must be applied to all other in-core inodes which | |
604 | * correspond to the same HFS file. | |
605 | */ | |
606 | ||
549c7297 CB |
607 | int hfs_inode_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
608 | struct iattr *attr) | |
1da177e4 | 609 | { |
2b0143b5 | 610 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
611 | struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); |
612 | int error; | |
613 | ||
549c7297 CB |
614 | error = setattr_prepare(&init_user_ns, dentry, |
615 | attr); /* basic permission checks */ | |
1da177e4 LT |
616 | if (error) |
617 | return error; | |
618 | ||
619 | /* no uig/gid changes and limit which mode bits can be set */ | |
620 | if (((attr->ia_valid & ATTR_UID) && | |
43b5e4cc | 621 | (!uid_eq(attr->ia_uid, hsb->s_uid))) || |
1da177e4 | 622 | ((attr->ia_valid & ATTR_GID) && |
43b5e4cc | 623 | (!gid_eq(attr->ia_gid, hsb->s_gid))) || |
1da177e4 LT |
624 | ((attr->ia_valid & ATTR_MODE) && |
625 | ((S_ISDIR(inode->i_mode) && | |
626 | (attr->ia_mode != inode->i_mode)) || | |
627 | (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { | |
628 | return hsb->s_quiet ? 0 : error; | |
629 | } | |
630 | ||
631 | if (attr->ia_valid & ATTR_MODE) { | |
632 | /* Only the 'w' bits can ever change and only all together. */ | |
633 | if (attr->ia_mode & S_IWUSR) | |
634 | attr->ia_mode = inode->i_mode | S_IWUGO; | |
635 | else | |
636 | attr->ia_mode = inode->i_mode & ~S_IWUGO; | |
637 | attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; | |
638 | } | |
1da177e4 | 639 | |
1025774c CH |
640 | if ((attr->ia_valid & ATTR_SIZE) && |
641 | attr->ia_size != i_size_read(inode)) { | |
562c72aa CH |
642 | inode_dio_wait(inode); |
643 | ||
c8cf464b | 644 | error = inode_newsize_ok(inode, attr->ia_size); |
1025774c CH |
645 | if (error) |
646 | return error; | |
c8cf464b MS |
647 | |
648 | truncate_setsize(inode, attr->ia_size); | |
649 | hfs_file_truncate(inode); | |
8cd3cb50 EF |
650 | inode->i_atime = inode->i_mtime = inode->i_ctime = |
651 | current_time(inode); | |
1025774c CH |
652 | } |
653 | ||
2f221d6f | 654 | setattr_copy(&init_user_ns, inode, attr); |
1025774c | 655 | mark_inode_dirty(inode); |
1da177e4 LT |
656 | return 0; |
657 | } | |
658 | ||
02c24a82 JB |
659 | static int hfs_file_fsync(struct file *filp, loff_t start, loff_t end, |
660 | int datasync) | |
b5fc510c AV |
661 | { |
662 | struct inode *inode = filp->f_mapping->host; | |
663 | struct super_block * sb; | |
664 | int ret, err; | |
665 | ||
3b49c9a1 | 666 | ret = file_write_and_wait_range(filp, start, end); |
02c24a82 JB |
667 | if (ret) |
668 | return ret; | |
5955102c | 669 | inode_lock(inode); |
02c24a82 | 670 | |
b5fc510c AV |
671 | /* sync the inode to buffers */ |
672 | ret = write_inode_now(inode, 0); | |
673 | ||
674 | /* sync the superblock to buffers */ | |
675 | sb = inode->i_sb; | |
43829731 | 676 | flush_delayed_work(&HFS_SB(sb)->mdb_work); |
b5fc510c AV |
677 | /* .. finally sync the buffers to disk */ |
678 | err = sync_blockdev(sb->s_bdev); | |
679 | if (!ret) | |
680 | ret = err; | |
5955102c | 681 | inode_unlock(inode); |
b5fc510c AV |
682 | return ret; |
683 | } | |
1da177e4 | 684 | |
4b6f5d20 | 685 | static const struct file_operations hfs_file_operations = { |
1da177e4 | 686 | .llseek = generic_file_llseek, |
aad4f8bb | 687 | .read_iter = generic_file_read_iter, |
8174202b | 688 | .write_iter = generic_file_write_iter, |
1da177e4 | 689 | .mmap = generic_file_mmap, |
5ffc4ef4 | 690 | .splice_read = generic_file_splice_read, |
b5fc510c | 691 | .fsync = hfs_file_fsync, |
1da177e4 LT |
692 | .open = hfs_file_open, |
693 | .release = hfs_file_release, | |
694 | }; | |
695 | ||
92e1d5be | 696 | static const struct inode_operations hfs_file_inode_operations = { |
1da177e4 | 697 | .lookup = hfs_file_lookup, |
1da177e4 | 698 | .setattr = hfs_inode_setattr, |
b8020eff | 699 | .listxattr = generic_listxattr, |
1da177e4 | 700 | }; |