[PATCH] inode-diet: Eliminate i_blksize from the inode structure
[linux-2.6/mini2440.git] / fs / hfsplus / inode.c
blob0eb1a60926682bec544dcbd697c293cec407973d
1 /*
2 * linux/fs/hfsplus/inode.c
4 * Copyright (C) 2001
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
8 * Inode handling routines
9 */
11 #include <linux/mm.h>
12 #include <linux/fs.h>
13 #include <linux/pagemap.h>
14 #include <linux/mpage.h>
16 #include "hfsplus_fs.h"
17 #include "hfsplus_raw.h"
19 static int hfsplus_readpage(struct file *file, struct page *page)
21 return block_read_full_page(page, hfsplus_get_block);
24 static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
26 return block_write_full_page(page, hfsplus_get_block, wbc);
29 static int hfsplus_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
31 return cont_prepare_write(page, from, to, hfsplus_get_block,
32 &HFSPLUS_I(page->mapping->host).phys_size);
35 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
37 return generic_block_bmap(mapping, block, hfsplus_get_block);
40 static int hfsplus_releasepage(struct page *page, gfp_t mask)
42 struct inode *inode = page->mapping->host;
43 struct super_block *sb = inode->i_sb;
44 struct hfs_btree *tree;
45 struct hfs_bnode *node;
46 u32 nidx;
47 int i, res = 1;
49 switch (inode->i_ino) {
50 case HFSPLUS_EXT_CNID:
51 tree = HFSPLUS_SB(sb).ext_tree;
52 break;
53 case HFSPLUS_CAT_CNID:
54 tree = HFSPLUS_SB(sb).cat_tree;
55 break;
56 case HFSPLUS_ATTR_CNID:
57 tree = HFSPLUS_SB(sb).attr_tree;
58 break;
59 default:
60 BUG();
61 return 0;
63 if (tree->node_size >= PAGE_CACHE_SIZE) {
64 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
65 spin_lock(&tree->hash_lock);
66 node = hfs_bnode_findhash(tree, nidx);
67 if (!node)
69 else if (atomic_read(&node->refcnt))
70 res = 0;
71 if (res && node) {
72 hfs_bnode_unhash(node);
73 hfs_bnode_free(node);
75 spin_unlock(&tree->hash_lock);
76 } else {
77 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
78 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
79 spin_lock(&tree->hash_lock);
80 do {
81 node = hfs_bnode_findhash(tree, nidx++);
82 if (!node)
83 continue;
84 if (atomic_read(&node->refcnt)) {
85 res = 0;
86 break;
88 hfs_bnode_unhash(node);
89 hfs_bnode_free(node);
90 } while (--i && nidx < tree->node_count);
91 spin_unlock(&tree->hash_lock);
93 return res ? try_to_free_buffers(page) : 0;
96 static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
97 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
99 struct file *file = iocb->ki_filp;
100 struct inode *inode = file->f_dentry->d_inode->i_mapping->host;
102 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
103 offset, nr_segs, hfsplus_get_block, NULL);
106 static int hfsplus_writepages(struct address_space *mapping,
107 struct writeback_control *wbc)
109 return mpage_writepages(mapping, wbc, hfsplus_get_block);
112 const struct address_space_operations hfsplus_btree_aops = {
113 .readpage = hfsplus_readpage,
114 .writepage = hfsplus_writepage,
115 .sync_page = block_sync_page,
116 .prepare_write = hfsplus_prepare_write,
117 .commit_write = generic_commit_write,
118 .bmap = hfsplus_bmap,
119 .releasepage = hfsplus_releasepage,
122 const struct address_space_operations hfsplus_aops = {
123 .readpage = hfsplus_readpage,
124 .writepage = hfsplus_writepage,
125 .sync_page = block_sync_page,
126 .prepare_write = hfsplus_prepare_write,
127 .commit_write = generic_commit_write,
128 .bmap = hfsplus_bmap,
129 .direct_IO = hfsplus_direct_IO,
130 .writepages = hfsplus_writepages,
133 static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry,
134 struct nameidata *nd)
136 struct hfs_find_data fd;
137 struct super_block *sb = dir->i_sb;
138 struct inode *inode = NULL;
139 int err;
141 if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
142 goto out;
144 inode = HFSPLUS_I(dir).rsrc_inode;
145 if (inode)
146 goto out;
148 inode = new_inode(sb);
149 if (!inode)
150 return ERR_PTR(-ENOMEM);
152 inode->i_ino = dir->i_ino;
153 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
154 init_MUTEX(&HFSPLUS_I(inode).extents_lock);
155 HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
157 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
158 err = hfsplus_find_cat(sb, dir->i_ino, &fd);
159 if (!err)
160 err = hfsplus_cat_read_inode(inode, &fd);
161 hfs_find_exit(&fd);
162 if (err) {
163 iput(inode);
164 return ERR_PTR(err);
166 HFSPLUS_I(inode).rsrc_inode = dir;
167 HFSPLUS_I(dir).rsrc_inode = inode;
168 igrab(dir);
169 hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
170 mark_inode_dirty(inode);
171 out:
172 d_add(dentry, inode);
173 return NULL;
176 static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir)
178 struct super_block *sb = inode->i_sb;
179 u16 mode;
181 mode = be16_to_cpu(perms->mode);
183 inode->i_uid = be32_to_cpu(perms->owner);
184 if (!inode->i_uid && !mode)
185 inode->i_uid = HFSPLUS_SB(sb).uid;
187 inode->i_gid = be32_to_cpu(perms->group);
188 if (!inode->i_gid && !mode)
189 inode->i_gid = HFSPLUS_SB(sb).gid;
191 if (dir) {
192 mode = mode ? (mode & S_IALLUGO) :
193 (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
194 mode |= S_IFDIR;
195 } else if (!mode)
196 mode = S_IFREG | ((S_IRUGO|S_IWUGO) &
197 ~(HFSPLUS_SB(sb).umask));
198 inode->i_mode = mode;
200 HFSPLUS_I(inode).rootflags = perms->rootflags;
201 HFSPLUS_I(inode).userflags = perms->userflags;
202 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
203 inode->i_flags |= S_IMMUTABLE;
204 else
205 inode->i_flags &= ~S_IMMUTABLE;
206 if (perms->rootflags & HFSPLUS_FLG_APPEND)
207 inode->i_flags |= S_APPEND;
208 else
209 inode->i_flags &= ~S_APPEND;
212 static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
214 if (inode->i_flags & S_IMMUTABLE)
215 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
216 else
217 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
218 if (inode->i_flags & S_APPEND)
219 perms->rootflags |= HFSPLUS_FLG_APPEND;
220 else
221 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
222 perms->userflags = HFSPLUS_I(inode).userflags;
223 perms->mode = cpu_to_be16(inode->i_mode);
224 perms->owner = cpu_to_be32(inode->i_uid);
225 perms->group = cpu_to_be32(inode->i_gid);
226 perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
229 static int hfsplus_permission(struct inode *inode, int mask, struct nameidata *nd)
231 /* MAY_EXEC is also used for lookup, if no x bit is set allow lookup,
232 * open_exec has the same test, so it's still not executable, if a x bit
233 * is set fall back to standard permission check.
235 if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111))
236 return 0;
237 return generic_permission(inode, mask, NULL);
241 static int hfsplus_file_open(struct inode *inode, struct file *file)
243 if (HFSPLUS_IS_RSRC(inode))
244 inode = HFSPLUS_I(inode).rsrc_inode;
245 if (atomic_read(&file->f_count) != 1)
246 return 0;
247 atomic_inc(&HFSPLUS_I(inode).opencnt);
248 return 0;
251 static int hfsplus_file_release(struct inode *inode, struct file *file)
253 struct super_block *sb = inode->i_sb;
255 if (HFSPLUS_IS_RSRC(inode))
256 inode = HFSPLUS_I(inode).rsrc_inode;
257 if (atomic_read(&file->f_count) != 0)
258 return 0;
259 if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
260 mutex_lock(&inode->i_mutex);
261 hfsplus_file_truncate(inode);
262 if (inode->i_flags & S_DEAD) {
263 hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
264 hfsplus_delete_inode(inode);
266 mutex_unlock(&inode->i_mutex);
268 return 0;
271 extern struct inode_operations hfsplus_dir_inode_operations;
272 extern struct file_operations hfsplus_dir_operations;
274 static struct inode_operations hfsplus_file_inode_operations = {
275 .lookup = hfsplus_file_lookup,
276 .truncate = hfsplus_file_truncate,
277 .permission = hfsplus_permission,
278 .setxattr = hfsplus_setxattr,
279 .getxattr = hfsplus_getxattr,
280 .listxattr = hfsplus_listxattr,
283 static const struct file_operations hfsplus_file_operations = {
284 .llseek = generic_file_llseek,
285 .read = generic_file_read,
286 .write = generic_file_write,
287 .mmap = generic_file_mmap,
288 .sendfile = generic_file_sendfile,
289 .fsync = file_fsync,
290 .open = hfsplus_file_open,
291 .release = hfsplus_file_release,
292 .ioctl = hfsplus_ioctl,
295 struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
297 struct inode *inode = new_inode(sb);
298 if (!inode)
299 return NULL;
301 inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
302 inode->i_mode = mode;
303 inode->i_uid = current->fsuid;
304 inode->i_gid = current->fsgid;
305 inode->i_nlink = 1;
306 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
307 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
308 init_MUTEX(&HFSPLUS_I(inode).extents_lock);
309 atomic_set(&HFSPLUS_I(inode).opencnt, 0);
310 HFSPLUS_I(inode).flags = 0;
311 memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
312 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
313 HFSPLUS_I(inode).alloc_blocks = 0;
314 HFSPLUS_I(inode).first_blocks = 0;
315 HFSPLUS_I(inode).cached_start = 0;
316 HFSPLUS_I(inode).cached_blocks = 0;
317 HFSPLUS_I(inode).phys_size = 0;
318 HFSPLUS_I(inode).fs_blocks = 0;
319 HFSPLUS_I(inode).rsrc_inode = NULL;
320 if (S_ISDIR(inode->i_mode)) {
321 inode->i_size = 2;
322 HFSPLUS_SB(sb).folder_count++;
323 inode->i_op = &hfsplus_dir_inode_operations;
324 inode->i_fop = &hfsplus_dir_operations;
325 } else if (S_ISREG(inode->i_mode)) {
326 HFSPLUS_SB(sb).file_count++;
327 inode->i_op = &hfsplus_file_inode_operations;
328 inode->i_fop = &hfsplus_file_operations;
329 inode->i_mapping->a_ops = &hfsplus_aops;
330 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
331 } else if (S_ISLNK(inode->i_mode)) {
332 HFSPLUS_SB(sb).file_count++;
333 inode->i_op = &page_symlink_inode_operations;
334 inode->i_mapping->a_ops = &hfsplus_aops;
335 HFSPLUS_I(inode).clump_blocks = 1;
336 } else
337 HFSPLUS_SB(sb).file_count++;
338 insert_inode_hash(inode);
339 mark_inode_dirty(inode);
340 sb->s_dirt = 1;
342 return inode;
345 void hfsplus_delete_inode(struct inode *inode)
347 struct super_block *sb = inode->i_sb;
349 if (S_ISDIR(inode->i_mode)) {
350 HFSPLUS_SB(sb).folder_count--;
351 sb->s_dirt = 1;
352 return;
354 HFSPLUS_SB(sb).file_count--;
355 if (S_ISREG(inode->i_mode)) {
356 if (!inode->i_nlink) {
357 inode->i_size = 0;
358 hfsplus_file_truncate(inode);
360 } else if (S_ISLNK(inode->i_mode)) {
361 inode->i_size = 0;
362 hfsplus_file_truncate(inode);
364 sb->s_dirt = 1;
367 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
369 struct super_block *sb = inode->i_sb;
370 u32 count;
371 int i;
373 memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
374 sizeof(hfsplus_extent_rec));
375 for (count = 0, i = 0; i < 8; i++)
376 count += be32_to_cpu(fork->extents[i].block_count);
377 HFSPLUS_I(inode).first_blocks = count;
378 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
379 HFSPLUS_I(inode).cached_start = 0;
380 HFSPLUS_I(inode).cached_blocks = 0;
382 HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
383 inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
384 HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
385 inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
386 HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
387 if (!HFSPLUS_I(inode).clump_blocks)
388 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
389 HFSPLUS_SB(sb).data_clump_blocks;
392 void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
394 memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
395 sizeof(hfsplus_extent_rec));
396 fork->total_size = cpu_to_be64(inode->i_size);
397 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
400 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
402 hfsplus_cat_entry entry;
403 int res = 0;
404 u16 type;
406 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
408 HFSPLUS_I(inode).dev = 0;
409 if (type == HFSPLUS_FOLDER) {
410 struct hfsplus_cat_folder *folder = &entry.folder;
412 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
413 /* panic? */;
414 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
415 sizeof(struct hfsplus_cat_folder));
416 hfsplus_get_perms(inode, &folder->permissions, 1);
417 inode->i_nlink = 1;
418 inode->i_size = 2 + be32_to_cpu(folder->valence);
419 inode->i_atime = hfsp_mt2ut(folder->access_date);
420 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
421 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
422 HFSPLUS_I(inode).create_date = folder->create_date;
423 HFSPLUS_I(inode).fs_blocks = 0;
424 inode->i_op = &hfsplus_dir_inode_operations;
425 inode->i_fop = &hfsplus_dir_operations;
426 } else if (type == HFSPLUS_FILE) {
427 struct hfsplus_cat_file *file = &entry.file;
429 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
430 /* panic? */;
431 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
432 sizeof(struct hfsplus_cat_file));
434 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
435 &file->data_fork : &file->rsrc_fork);
436 hfsplus_get_perms(inode, &file->permissions, 0);
437 inode->i_nlink = 1;
438 if (S_ISREG(inode->i_mode)) {
439 if (file->permissions.dev)
440 inode->i_nlink = be32_to_cpu(file->permissions.dev);
441 inode->i_op = &hfsplus_file_inode_operations;
442 inode->i_fop = &hfsplus_file_operations;
443 inode->i_mapping->a_ops = &hfsplus_aops;
444 } else if (S_ISLNK(inode->i_mode)) {
445 inode->i_op = &page_symlink_inode_operations;
446 inode->i_mapping->a_ops = &hfsplus_aops;
447 } else {
448 init_special_inode(inode, inode->i_mode,
449 be32_to_cpu(file->permissions.dev));
451 inode->i_atime = hfsp_mt2ut(file->access_date);
452 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
453 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
454 HFSPLUS_I(inode).create_date = file->create_date;
455 } else {
456 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
457 res = -EIO;
459 return res;
462 int hfsplus_cat_write_inode(struct inode *inode)
464 struct inode *main_inode = inode;
465 struct hfs_find_data fd;
466 hfsplus_cat_entry entry;
468 if (HFSPLUS_IS_RSRC(inode))
469 main_inode = HFSPLUS_I(inode).rsrc_inode;
471 if (!main_inode->i_nlink)
472 return 0;
474 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd))
475 /* panic? */
476 return -EIO;
478 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
479 /* panic? */
480 goto out;
482 if (S_ISDIR(main_inode->i_mode)) {
483 struct hfsplus_cat_folder *folder = &entry.folder;
485 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
486 /* panic? */;
487 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
488 sizeof(struct hfsplus_cat_folder));
489 /* simple node checks? */
490 hfsplus_set_perms(inode, &folder->permissions);
491 folder->access_date = hfsp_ut2mt(inode->i_atime);
492 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
493 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
494 folder->valence = cpu_to_be32(inode->i_size - 2);
495 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
496 sizeof(struct hfsplus_cat_folder));
497 } else if (HFSPLUS_IS_RSRC(inode)) {
498 struct hfsplus_cat_file *file = &entry.file;
499 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
500 sizeof(struct hfsplus_cat_file));
501 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
502 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
503 sizeof(struct hfsplus_cat_file));
504 } else {
505 struct hfsplus_cat_file *file = &entry.file;
507 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
508 /* panic? */;
509 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
510 sizeof(struct hfsplus_cat_file));
511 hfsplus_inode_write_fork(inode, &file->data_fork);
512 if (S_ISREG(inode->i_mode))
513 HFSPLUS_I(inode).dev = inode->i_nlink;
514 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
515 HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
516 hfsplus_set_perms(inode, &file->permissions);
517 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
518 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
519 else
520 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
521 file->access_date = hfsp_ut2mt(inode->i_atime);
522 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
523 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
524 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
525 sizeof(struct hfsplus_cat_file));
527 out:
528 hfs_find_exit(&fd);
529 return 0;