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[PATCH] add missing syscall declarations
[net-next-2.6.git] / fs / hfsplus / inode.c
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1da177e4
LT		 1/*
2 * linux/fs/hfsplus/inode.c
3 *
4 * Copyright (C) 2001
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
7 *
8 * Inode handling routines
9 */
10
11#include <linux/mm.h>
12#include <linux/fs.h>
13#include <linux/pagemap.h>
1da177e4
LT		 14#include <linux/mpage.h>
15
16#include "hfsplus_fs.h"
17#include "hfsplus_raw.h"
18
19static int hfsplus_readpage(struct file *file, struct page *page)
20{
21 //printk("readpage: %lu\n", page->index);
22 return block_read_full_page(page, hfsplus_get_block);
23}
24
25static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
26{
27 //printk("writepage: %lu\n", page->index);
28 return block_write_full_page(page, hfsplus_get_block, wbc);
29}
30
31static int hfsplus_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
32{
33 return cont_prepare_write(page, from, to, hfsplus_get_block,
34 &HFSPLUS_I(page->mapping->host).phys_size);
35}
36
37static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
38{
39 return generic_block_bmap(mapping, block, hfsplus_get_block);
40}
41
27496a8c 42static int hfsplus_releasepage(struct page *page, gfp_t mask)
1da177e4
LT		 43{
44 struct inode *inode = page->mapping->host;
45 struct super_block *sb = inode->i_sb;
46 struct hfs_btree *tree;
47 struct hfs_bnode *node;
48 u32 nidx;
49 int i, res = 1;
50
51 switch (inode->i_ino) {
52 case HFSPLUS_EXT_CNID:
53 tree = HFSPLUS_SB(sb).ext_tree;
54 break;
55 case HFSPLUS_CAT_CNID:
56 tree = HFSPLUS_SB(sb).cat_tree;
57 break;
58 case HFSPLUS_ATTR_CNID:
59 tree = HFSPLUS_SB(sb).attr_tree;
60 break;
61 default:
62 BUG();
63 return 0;
64 }
65 if (tree->node_size >= PAGE_CACHE_SIZE) {
66 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
67 spin_lock(&tree->hash_lock);
68 node = hfs_bnode_findhash(tree, nidx);
69 if (!node)
70 ;
71 else if (atomic_read(&node->refcnt))
72 res = 0;
73 if (res && node) {
74 hfs_bnode_unhash(node);
75 hfs_bnode_free(node);
76 }
77 spin_unlock(&tree->hash_lock);
78 } else {
79 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
80 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
81 spin_lock(&tree->hash_lock);
82 do {
83 node = hfs_bnode_findhash(tree, nidx++);
84 if (!node)
85 continue;
86 if (atomic_read(&node->refcnt)) {
87 res = 0;
88 break;
89 }
90 hfs_bnode_unhash(node);
91 hfs_bnode_free(node);
92 } while (--i && nidx < tree->node_count);
93 spin_unlock(&tree->hash_lock);
94 }
95 //printk("releasepage: %lu,%x = %d\n", page->index, mask, res);
96 return res ? try_to_free_buffers(page) : 0;
97}
98
99static int hfsplus_get_blocks(struct inode *inode, sector_t iblock, unsigned long max_blocks,
100 struct buffer_head *bh_result, int create)
101{
102 int ret;
103
104 ret = hfsplus_get_block(inode, iblock, bh_result, create);
105 if (!ret)
106 bh_result->b_size = (1 << inode->i_blkbits);
107 return ret;
108}
109
110static ssize_t hfsplus_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;
114 struct inode *inode = file->f_dentry->d_inode->i_mapping->host;
115
116 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
117 offset, nr_segs, hfsplus_get_blocks, NULL);
118}
119
120static int hfsplus_writepages(struct address_space *mapping,
121 struct writeback_control *wbc)
122{
123 return mpage_writepages(mapping, wbc, hfsplus_get_block);
124}
125
126struct address_space_operations hfsplus_btree_aops = {
127 .readpage = hfsplus_readpage,
128 .writepage = hfsplus_writepage,
129 .sync_page = block_sync_page,
130 .prepare_write = hfsplus_prepare_write,
131 .commit_write = generic_commit_write,
132 .bmap = hfsplus_bmap,
133 .releasepage = hfsplus_releasepage,
134};
135
136struct address_space_operations hfsplus_aops = {
137 .readpage = hfsplus_readpage,
138 .writepage = hfsplus_writepage,
139 .sync_page = block_sync_page,
140 .prepare_write = hfsplus_prepare_write,
141 .commit_write = generic_commit_write,
142 .bmap = hfsplus_bmap,
143 .direct_IO = hfsplus_direct_IO,
144 .writepages = hfsplus_writepages,
145};
146
147static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry,
148 struct nameidata *nd)
149{
150 struct hfs_find_data fd;
151 struct super_block *sb = dir->i_sb;
152 struct inode *inode = NULL;
153 int err;
154
155 if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
156 goto out;
157
158 inode = HFSPLUS_I(dir).rsrc_inode;
159 if (inode)
160 goto out;
161
162 inode = new_inode(sb);
163 if (!inode)
164 return ERR_PTR(-ENOMEM);
165
166 inode->i_ino = dir->i_ino;
167 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
168 init_MUTEX(&HFSPLUS_I(inode).extents_lock);
169 HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
170
171 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
172 err = hfsplus_find_cat(sb, dir->i_ino, &fd);
173 if (!err)
174 err = hfsplus_cat_read_inode(inode, &fd);
175 hfs_find_exit(&fd);
176 if (err) {
177 iput(inode);
178 return ERR_PTR(err);
179 }
180 HFSPLUS_I(inode).rsrc_inode = dir;
181 HFSPLUS_I(dir).rsrc_inode = inode;
182 igrab(dir);
183 hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
184 mark_inode_dirty(inode);
1da177e4
LT		 185out:
186 d_add(dentry, inode);
187 return NULL;
188}
189
190static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir)
191{
192 struct super_block *sb = inode->i_sb;
193 u16 mode;
194
195 mode = be16_to_cpu(perms->mode);
196
197 inode->i_uid = be32_to_cpu(perms->owner);
198 if (!inode->i_uid && !mode)
199 inode->i_uid = HFSPLUS_SB(sb).uid;
200
201 inode->i_gid = be32_to_cpu(perms->group);
202 if (!inode->i_gid && !mode)
203 inode->i_gid = HFSPLUS_SB(sb).gid;
204
205 if (dir) {
206 mode = mode ? (mode & S_IALLUGO) :
207 (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
208 mode |= S_IFDIR;
209 } else if (!mode)
210 mode = S_IFREG | ((S_IRUGO|S_IWUGO) &
211 ~(HFSPLUS_SB(sb).umask));
212 inode->i_mode = mode;
213
214 HFSPLUS_I(inode).rootflags = perms->rootflags;
215 HFSPLUS_I(inode).userflags = perms->userflags;
216 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
217 inode->i_flags |= S_IMMUTABLE;
218 else
219 inode->i_flags &= ~S_IMMUTABLE;
220 if (perms->rootflags & HFSPLUS_FLG_APPEND)
221 inode->i_flags |= S_APPEND;
222 else
223 inode->i_flags &= ~S_APPEND;
224}
225
226static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
227{
228 if (inode->i_flags & S_IMMUTABLE)
229 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
230 else
231 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
232 if (inode->i_flags & S_APPEND)
233 perms->rootflags |= HFSPLUS_FLG_APPEND;
234 else
235 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
236 perms->userflags = HFSPLUS_I(inode).userflags;
237 perms->mode = cpu_to_be16(inode->i_mode);
238 perms->owner = cpu_to_be32(inode->i_uid);
239 perms->group = cpu_to_be32(inode->i_gid);
240 perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
241}
242
243static int hfsplus_permission(struct inode *inode, int mask, struct nameidata *nd)
244{
245 /* MAY_EXEC is also used for lookup, if no x bit is set allow lookup,
246 * open_exec has the same test, so it's still not executable, if a x bit
247 * is set fall back to standard permission check.
248 */
249 if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111))
250 return 0;
251 return generic_permission(inode, mask, NULL);
252}
253
254
255static int hfsplus_file_open(struct inode *inode, struct file *file)
256{
257 if (HFSPLUS_IS_RSRC(inode))
258 inode = HFSPLUS_I(inode).rsrc_inode;
259 if (atomic_read(&file->f_count) != 1)
260 return 0;
261 atomic_inc(&HFSPLUS_I(inode).opencnt);
262 return 0;
263}
264
265static int hfsplus_file_release(struct inode *inode, struct file *file)
266{
267 struct super_block *sb = inode->i_sb;
268
269 if (HFSPLUS_IS_RSRC(inode))
270 inode = HFSPLUS_I(inode).rsrc_inode;
271 if (atomic_read(&file->f_count) != 0)
272 return 0;
273 if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
1b1dcc1b 274 mutex_lock(&inode->i_mutex);
1da177e4
LT		 275 hfsplus_file_truncate(inode);
276 if (inode->i_flags & S_DEAD) {
277 hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
278 hfsplus_delete_inode(inode);
279 }
1b1dcc1b 280 mutex_unlock(&inode->i_mutex);
1da177e4
LT		 281 }
282 return 0;
283}
284
285extern struct inode_operations hfsplus_dir_inode_operations;
286extern struct file_operations hfsplus_dir_operations;
287
288static struct inode_operations hfsplus_file_inode_operations = {
289 .lookup = hfsplus_file_lookup,
290 .truncate = hfsplus_file_truncate,
291 .permission = hfsplus_permission,
292 .setxattr = hfsplus_setxattr,
293 .getxattr = hfsplus_getxattr,
294 .listxattr = hfsplus_listxattr,
295};
296
297static struct file_operations hfsplus_file_operations = {
298 .llseek = generic_file_llseek,
299 .read = generic_file_read,
300 .write = generic_file_write,
301 .mmap = generic_file_mmap,
302 .sendfile = generic_file_sendfile,
303 .fsync = file_fsync,
304 .open = hfsplus_file_open,
305 .release = hfsplus_file_release,
306 .ioctl = hfsplus_ioctl,
307};
308
309struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
310{
311 struct inode *inode = new_inode(sb);
312 if (!inode)
313 return NULL;
314
1da177e4
LT		 315 inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
316 inode->i_mode = mode;
317 inode->i_uid = current->fsuid;
318 inode->i_gid = current->fsgid;
319 inode->i_nlink = 1;
320 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
321 inode->i_blksize = HFSPLUS_SB(sb).alloc_blksz;
322 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
323 init_MUTEX(&HFSPLUS_I(inode).extents_lock);
324 atomic_set(&HFSPLUS_I(inode).opencnt, 0);
325 HFSPLUS_I(inode).flags = 0;
326 memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
327 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
328 HFSPLUS_I(inode).alloc_blocks = 0;
329 HFSPLUS_I(inode).first_blocks = 0;
330 HFSPLUS_I(inode).cached_start = 0;
331 HFSPLUS_I(inode).cached_blocks = 0;
332 HFSPLUS_I(inode).phys_size = 0;
333 HFSPLUS_I(inode).fs_blocks = 0;
334 HFSPLUS_I(inode).rsrc_inode = NULL;
335 if (S_ISDIR(inode->i_mode)) {
336 inode->i_size = 2;
337 HFSPLUS_SB(sb).folder_count++;
338 inode->i_op = &hfsplus_dir_inode_operations;
339 inode->i_fop = &hfsplus_dir_operations;
340 } else if (S_ISREG(inode->i_mode)) {
341 HFSPLUS_SB(sb).file_count++;
342 inode->i_op = &hfsplus_file_inode_operations;
343 inode->i_fop = &hfsplus_file_operations;
344 inode->i_mapping->a_ops = &hfsplus_aops;
345 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
346 } else if (S_ISLNK(inode->i_mode)) {
347 HFSPLUS_SB(sb).file_count++;
348 inode->i_op = &page_symlink_inode_operations;
349 inode->i_mapping->a_ops = &hfsplus_aops;
350 HFSPLUS_I(inode).clump_blocks = 1;
351 } else
352 HFSPLUS_SB(sb).file_count++;
353 insert_inode_hash(inode);
354 mark_inode_dirty(inode);
355 sb->s_dirt = 1;
356
357 return inode;
358}
359
360void hfsplus_delete_inode(struct inode *inode)
361{
362 struct super_block *sb = inode->i_sb;
363
364 if (S_ISDIR(inode->i_mode)) {
365 HFSPLUS_SB(sb).folder_count--;
366 sb->s_dirt = 1;
367 return;
368 }
369 HFSPLUS_SB(sb).file_count--;
370 if (S_ISREG(inode->i_mode)) {
371 if (!inode->i_nlink) {
372 inode->i_size = 0;
373 hfsplus_file_truncate(inode);
374 }
375 } else if (S_ISLNK(inode->i_mode)) {
376 inode->i_size = 0;
377 hfsplus_file_truncate(inode);
378 }
379 sb->s_dirt = 1;
380}
381
382void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
383{
384 struct super_block *sb = inode->i_sb;
385 u32 count;
386 int i;
387
388 memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
389 sizeof(hfsplus_extent_rec));
390 for (count = 0, i = 0; i < 8; i++)
391 count += be32_to_cpu(fork->extents[i].block_count);
392 HFSPLUS_I(inode).first_blocks = count;
393 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
394 HFSPLUS_I(inode).cached_start = 0;
395 HFSPLUS_I(inode).cached_blocks = 0;
396
397 HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
398 inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
399 HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
400 inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
401 HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
402 if (!HFSPLUS_I(inode).clump_blocks)
403 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
404 HFSPLUS_SB(sb).data_clump_blocks;
405}
406
407void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
408{
409 memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
410 sizeof(hfsplus_extent_rec));
411 fork->total_size = cpu_to_be64(inode->i_size);
412 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
413}
414
415int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
416{
417 hfsplus_cat_entry entry;
418 int res = 0;
419 u16 type;
420
421 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
422
423 HFSPLUS_I(inode).dev = 0;
424 inode->i_blksize = HFSPLUS_SB(inode->i_sb).alloc_blksz;
425 if (type == HFSPLUS_FOLDER) {
426 struct hfsplus_cat_folder *folder = &entry.folder;
427
428 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
429 /* panic? */;
430 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
431 sizeof(struct hfsplus_cat_folder));
432 hfsplus_get_perms(inode, &folder->permissions, 1);
433 inode->i_nlink = 1;
434 inode->i_size = 2 + be32_to_cpu(folder->valence);
435 inode->i_atime = hfsp_mt2ut(folder->access_date);
436 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
437 inode->i_ctime = inode->i_mtime;
438 HFSPLUS_I(inode).fs_blocks = 0;
439 inode->i_op = &hfsplus_dir_inode_operations;
440 inode->i_fop = &hfsplus_dir_operations;
441 } else if (type == HFSPLUS_FILE) {
442 struct hfsplus_cat_file *file = &entry.file;
443
444 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
445 /* panic? */;
446 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
447 sizeof(struct hfsplus_cat_file));
448
449 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
450 &file->data_fork : &file->rsrc_fork);
451 hfsplus_get_perms(inode, &file->permissions, 0);
452 inode->i_nlink = 1;
453 if (S_ISREG(inode->i_mode)) {
454 if (file->permissions.dev)
455 inode->i_nlink = be32_to_cpu(file->permissions.dev);
456 inode->i_op = &hfsplus_file_inode_operations;
457 inode->i_fop = &hfsplus_file_operations;
458 inode->i_mapping->a_ops = &hfsplus_aops;
459 } else if (S_ISLNK(inode->i_mode)) {
460 inode->i_op = &page_symlink_inode_operations;
461 inode->i_mapping->a_ops = &hfsplus_aops;
462 } else {
463 init_special_inode(inode, inode->i_mode,
464 be32_to_cpu(file->permissions.dev));
465 }
466 inode->i_atime = hfsp_mt2ut(file->access_date);
467 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
468 inode->i_ctime = inode->i_mtime;
469 } else {
470 printk("HFS+-fs: bad catalog entry used to create inode\n");
471 res = -EIO;
472 }
473 return res;
474}
475
476int hfsplus_cat_write_inode(struct inode *inode)
477{
478 struct inode *main_inode = inode;
479 struct hfs_find_data fd;
480 hfsplus_cat_entry entry;
481
482 if (HFSPLUS_IS_RSRC(inode))
483 main_inode = HFSPLUS_I(inode).rsrc_inode;
484
485 if (!main_inode->i_nlink)
486 return 0;
487
488 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd))
489 /* panic? */
490 return -EIO;
491
492 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
493 /* panic? */
494 goto out;
495
496 if (S_ISDIR(main_inode->i_mode)) {
497 struct hfsplus_cat_folder *folder = &entry.folder;
498
499 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
500 /* panic? */;
501 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
502 sizeof(struct hfsplus_cat_folder));
503 /* simple node checks? */
504 hfsplus_set_perms(inode, &folder->permissions);
505 folder->access_date = hfsp_ut2mt(inode->i_atime);
506 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
507 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
508 folder->valence = cpu_to_be32(inode->i_size - 2);
509 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
510 sizeof(struct hfsplus_cat_folder));
511 } else if (HFSPLUS_IS_RSRC(inode)) {
512 struct hfsplus_cat_file *file = &entry.file;
513 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
514 sizeof(struct hfsplus_cat_file));
515 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
516 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
517 sizeof(struct hfsplus_cat_file));
518 } else {
519 struct hfsplus_cat_file *file = &entry.file;
520
521 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
522 /* panic? */;
523 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
524 sizeof(struct hfsplus_cat_file));
525 hfsplus_inode_write_fork(inode, &file->data_fork);
526 if (S_ISREG(inode->i_mode))
527 HFSPLUS_I(inode).dev = inode->i_nlink;
528 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
529 HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
530 hfsplus_set_perms(inode, &file->permissions);
531 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
532 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
533 else
534 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
535 file->access_date = hfsp_ut2mt(inode->i_atime);
536 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
537 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
538 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
539 sizeof(struct hfsplus_cat_file));
540 }
541out:
542 hfs_find_exit(&fd);
543 return 0;
544}
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