b085d64a2b672580e328be86af33475e87544f6e
[linux-2.6.git] / fs / hfsplus / inode.c
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>
14 #include <linux/mpage.h>
15 #include <linux/sched.h>
16
17 #include "hfsplus_fs.h"
18 #include "hfsplus_raw.h"
19
20 static int hfsplus_readpage(struct file *file, struct page *page)
21 {
22         return block_read_full_page(page, hfsplus_get_block);
23 }
24
25 static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
26 {
27         return block_write_full_page(page, hfsplus_get_block, wbc);
28 }
29
30 static int hfsplus_write_begin(struct file *file, struct address_space *mapping,
31                         loff_t pos, unsigned len, unsigned flags,
32                         struct page **pagep, void **fsdata)
33 {
34         *pagep = NULL;
35         return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
36                                 hfsplus_get_block,
37                                 &HFSPLUS_I(mapping->host).phys_size);
38 }
39
40 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
41 {
42         return generic_block_bmap(mapping, block, hfsplus_get_block);
43 }
44
45 static int hfsplus_releasepage(struct page *page, gfp_t mask)
46 {
47         struct inode *inode = page->mapping->host;
48         struct super_block *sb = inode->i_sb;
49         struct hfs_btree *tree;
50         struct hfs_bnode *node;
51         u32 nidx;
52         int i, res = 1;
53
54         switch (inode->i_ino) {
55         case HFSPLUS_EXT_CNID:
56                 tree = HFSPLUS_SB(sb).ext_tree;
57                 break;
58         case HFSPLUS_CAT_CNID:
59                 tree = HFSPLUS_SB(sb).cat_tree;
60                 break;
61         case HFSPLUS_ATTR_CNID:
62                 tree = HFSPLUS_SB(sb).attr_tree;
63                 break;
64         default:
65                 BUG();
66                 return 0;
67         }
68         if (!tree)
69                 return 0;
70         if (tree->node_size >= PAGE_CACHE_SIZE) {
71                 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
72                 spin_lock(&tree->hash_lock);
73                 node = hfs_bnode_findhash(tree, nidx);
74                 if (!node)
75                         ;
76                 else if (atomic_read(&node->refcnt))
77                         res = 0;
78                 if (res && node) {
79                         hfs_bnode_unhash(node);
80                         hfs_bnode_free(node);
81                 }
82                 spin_unlock(&tree->hash_lock);
83         } else {
84                 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
85                 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
86                 spin_lock(&tree->hash_lock);
87                 do {
88                         node = hfs_bnode_findhash(tree, nidx++);
89                         if (!node)
90                                 continue;
91                         if (atomic_read(&node->refcnt)) {
92                                 res = 0;
93                                 break;
94                         }
95                         hfs_bnode_unhash(node);
96                         hfs_bnode_free(node);
97                 } while (--i && nidx < tree->node_count);
98                 spin_unlock(&tree->hash_lock);
99         }
100         return res ? try_to_free_buffers(page) : 0;
101 }
102
103 static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
104                 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
105 {
106         struct file *file = iocb->ki_filp;
107         struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
108
109         return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
110                                   offset, nr_segs, hfsplus_get_block, NULL);
111 }
112
113 static int hfsplus_writepages(struct address_space *mapping,
114                               struct writeback_control *wbc)
115 {
116         return mpage_writepages(mapping, wbc, hfsplus_get_block);
117 }
118
119 const struct address_space_operations hfsplus_btree_aops = {
120         .readpage       = hfsplus_readpage,
121         .writepage      = hfsplus_writepage,
122         .sync_page      = block_sync_page,
123         .write_begin    = hfsplus_write_begin,
124         .write_end      = generic_write_end,
125         .bmap           = hfsplus_bmap,
126         .releasepage    = hfsplus_releasepage,
127 };
128
129 const struct address_space_operations hfsplus_aops = {
130         .readpage       = hfsplus_readpage,
131         .writepage      = hfsplus_writepage,
132         .sync_page      = block_sync_page,
133         .write_begin    = hfsplus_write_begin,
134         .write_end      = generic_write_end,
135         .bmap           = hfsplus_bmap,
136         .direct_IO      = hfsplus_direct_IO,
137         .writepages     = hfsplus_writepages,
138 };
139
140 struct dentry_operations hfsplus_dentry_operations = {
141         .d_hash       = hfsplus_hash_dentry,
142         .d_compare    = hfsplus_compare_dentry,
143 };
144
145 static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry,
146                                           struct nameidata *nd)
147 {
148         struct hfs_find_data fd;
149         struct super_block *sb = dir->i_sb;
150         struct inode *inode = NULL;
151         int err;
152
153         if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
154                 goto out;
155
156         inode = HFSPLUS_I(dir).rsrc_inode;
157         if (inode)
158                 goto out;
159
160         inode = new_inode(sb);
161         if (!inode)
162                 return ERR_PTR(-ENOMEM);
163
164         inode->i_ino = dir->i_ino;
165         INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
166         mutex_init(&HFSPLUS_I(inode).extents_lock);
167         HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
168
169         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
170         err = hfsplus_find_cat(sb, dir->i_ino, &fd);
171         if (!err)
172                 err = hfsplus_cat_read_inode(inode, &fd);
173         hfs_find_exit(&fd);
174         if (err) {
175                 iput(inode);
176                 return ERR_PTR(err);
177         }
178         HFSPLUS_I(inode).rsrc_inode = dir;
179         HFSPLUS_I(dir).rsrc_inode = inode;
180         igrab(dir);
181         hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
182         mark_inode_dirty(inode);
183 out:
184         d_add(dentry, inode);
185         return NULL;
186 }
187
188 static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir)
189 {
190         struct super_block *sb = inode->i_sb;
191         u16 mode;
192
193         mode = be16_to_cpu(perms->mode);
194
195         inode->i_uid = be32_to_cpu(perms->owner);
196         if (!inode->i_uid && !mode)
197                 inode->i_uid = HFSPLUS_SB(sb).uid;
198
199         inode->i_gid = be32_to_cpu(perms->group);
200         if (!inode->i_gid && !mode)
201                 inode->i_gid = HFSPLUS_SB(sb).gid;
202
203         if (dir) {
204                 mode = mode ? (mode & S_IALLUGO) :
205                         (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
206                 mode |= S_IFDIR;
207         } else if (!mode)
208                 mode = S_IFREG | ((S_IRUGO|S_IWUGO) &
209                         ~(HFSPLUS_SB(sb).umask));
210         inode->i_mode = mode;
211
212         HFSPLUS_I(inode).rootflags = perms->rootflags;
213         HFSPLUS_I(inode).userflags = perms->userflags;
214         if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
215                 inode->i_flags |= S_IMMUTABLE;
216         else
217                 inode->i_flags &= ~S_IMMUTABLE;
218         if (perms->rootflags & HFSPLUS_FLG_APPEND)
219                 inode->i_flags |= S_APPEND;
220         else
221                 inode->i_flags &= ~S_APPEND;
222 }
223
224 static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
225 {
226         if (inode->i_flags & S_IMMUTABLE)
227                 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
228         else
229                 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
230         if (inode->i_flags & S_APPEND)
231                 perms->rootflags |= HFSPLUS_FLG_APPEND;
232         else
233                 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
234         perms->userflags = HFSPLUS_I(inode).userflags;
235         perms->mode = cpu_to_be16(inode->i_mode);
236         perms->owner = cpu_to_be32(inode->i_uid);
237         perms->group = cpu_to_be32(inode->i_gid);
238         perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
239 }
240
241 static int hfsplus_permission(struct inode *inode, int mask)
242 {
243         /* MAY_EXEC is also used for lookup, if no x bit is set allow lookup,
244          * open_exec has the same test, so it's still not executable, if a x bit
245          * is set fall back to standard permission check.
246          */
247         if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111))
248                 return 0;
249         return generic_permission(inode, mask, NULL);
250 }
251
252
253 static int hfsplus_file_open(struct inode *inode, struct file *file)
254 {
255         if (HFSPLUS_IS_RSRC(inode))
256                 inode = HFSPLUS_I(inode).rsrc_inode;
257         atomic_inc(&HFSPLUS_I(inode).opencnt);
258         return 0;
259 }
260
261 static int hfsplus_file_release(struct inode *inode, struct file *file)
262 {
263         struct super_block *sb = inode->i_sb;
264
265         if (HFSPLUS_IS_RSRC(inode))
266                 inode = HFSPLUS_I(inode).rsrc_inode;
267         if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
268                 mutex_lock(&inode->i_mutex);
269                 hfsplus_file_truncate(inode);
270                 if (inode->i_flags & S_DEAD) {
271                         hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
272                         hfsplus_delete_inode(inode);
273                 }
274                 mutex_unlock(&inode->i_mutex);
275         }
276         return 0;
277 }
278
279 static const struct inode_operations hfsplus_file_inode_operations = {
280         .lookup         = hfsplus_file_lookup,
281         .truncate       = hfsplus_file_truncate,
282         .permission     = hfsplus_permission,
283         .setxattr       = hfsplus_setxattr,
284         .getxattr       = hfsplus_getxattr,
285         .listxattr      = hfsplus_listxattr,
286 };
287
288 static const struct file_operations hfsplus_file_operations = {
289         .llseek         = generic_file_llseek,
290         .read           = do_sync_read,
291         .aio_read       = generic_file_aio_read,
292         .write          = do_sync_write,
293         .aio_write      = generic_file_aio_write,
294         .mmap           = generic_file_mmap,
295         .splice_read    = generic_file_splice_read,
296         .fsync          = file_fsync,
297         .open           = hfsplus_file_open,
298         .release        = hfsplus_file_release,
299         .ioctl          = hfsplus_ioctl,
300 };
301
302 struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
303 {
304         struct inode *inode = new_inode(sb);
305         if (!inode)
306                 return NULL;
307
308         inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
309         inode->i_mode = mode;
310         inode->i_uid = current->fsuid;
311         inode->i_gid = current->fsgid;
312         inode->i_nlink = 1;
313         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
314         INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
315         mutex_init(&HFSPLUS_I(inode).extents_lock);
316         atomic_set(&HFSPLUS_I(inode).opencnt, 0);
317         HFSPLUS_I(inode).flags = 0;
318         memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
319         memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
320         HFSPLUS_I(inode).alloc_blocks = 0;
321         HFSPLUS_I(inode).first_blocks = 0;
322         HFSPLUS_I(inode).cached_start = 0;
323         HFSPLUS_I(inode).cached_blocks = 0;
324         HFSPLUS_I(inode).phys_size = 0;
325         HFSPLUS_I(inode).fs_blocks = 0;
326         HFSPLUS_I(inode).rsrc_inode = NULL;
327         if (S_ISDIR(inode->i_mode)) {
328                 inode->i_size = 2;
329                 HFSPLUS_SB(sb).folder_count++;
330                 inode->i_op = &hfsplus_dir_inode_operations;
331                 inode->i_fop = &hfsplus_dir_operations;
332         } else if (S_ISREG(inode->i_mode)) {
333                 HFSPLUS_SB(sb).file_count++;
334                 inode->i_op = &hfsplus_file_inode_operations;
335                 inode->i_fop = &hfsplus_file_operations;
336                 inode->i_mapping->a_ops = &hfsplus_aops;
337                 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
338         } else if (S_ISLNK(inode->i_mode)) {
339                 HFSPLUS_SB(sb).file_count++;
340                 inode->i_op = &page_symlink_inode_operations;
341                 inode->i_mapping->a_ops = &hfsplus_aops;
342                 HFSPLUS_I(inode).clump_blocks = 1;
343         } else
344                 HFSPLUS_SB(sb).file_count++;
345         insert_inode_hash(inode);
346         mark_inode_dirty(inode);
347         sb->s_dirt = 1;
348
349         return inode;
350 }
351
352 void hfsplus_delete_inode(struct inode *inode)
353 {
354         struct super_block *sb = inode->i_sb;
355
356         if (S_ISDIR(inode->i_mode)) {
357                 HFSPLUS_SB(sb).folder_count--;
358                 sb->s_dirt = 1;
359                 return;
360         }
361         HFSPLUS_SB(sb).file_count--;
362         if (S_ISREG(inode->i_mode)) {
363                 if (!inode->i_nlink) {
364                         inode->i_size = 0;
365                         hfsplus_file_truncate(inode);
366                 }
367         } else if (S_ISLNK(inode->i_mode)) {
368                 inode->i_size = 0;
369                 hfsplus_file_truncate(inode);
370         }
371         sb->s_dirt = 1;
372 }
373
374 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
375 {
376         struct super_block *sb = inode->i_sb;
377         u32 count;
378         int i;
379
380         memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
381                sizeof(hfsplus_extent_rec));
382         for (count = 0, i = 0; i < 8; i++)
383                 count += be32_to_cpu(fork->extents[i].block_count);
384         HFSPLUS_I(inode).first_blocks = count;
385         memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
386         HFSPLUS_I(inode).cached_start = 0;
387         HFSPLUS_I(inode).cached_blocks = 0;
388
389         HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
390         inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
391         HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
392         inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
393         HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
394         if (!HFSPLUS_I(inode).clump_blocks)
395                 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
396                                 HFSPLUS_SB(sb).data_clump_blocks;
397 }
398
399 void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
400 {
401         memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
402                sizeof(hfsplus_extent_rec));
403         fork->total_size = cpu_to_be64(inode->i_size);
404         fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
405 }
406
407 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
408 {
409         hfsplus_cat_entry entry;
410         int res = 0;
411         u16 type;
412
413         type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
414
415         HFSPLUS_I(inode).dev = 0;
416         if (type == HFSPLUS_FOLDER) {
417                 struct hfsplus_cat_folder *folder = &entry.folder;
418
419                 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
420                         /* panic? */;
421                 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
422                                         sizeof(struct hfsplus_cat_folder));
423                 hfsplus_get_perms(inode, &folder->permissions, 1);
424                 inode->i_nlink = 1;
425                 inode->i_size = 2 + be32_to_cpu(folder->valence);
426                 inode->i_atime = hfsp_mt2ut(folder->access_date);
427                 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
428                 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
429                 HFSPLUS_I(inode).create_date = folder->create_date;
430                 HFSPLUS_I(inode).fs_blocks = 0;
431                 inode->i_op = &hfsplus_dir_inode_operations;
432                 inode->i_fop = &hfsplus_dir_operations;
433         } else if (type == HFSPLUS_FILE) {
434                 struct hfsplus_cat_file *file = &entry.file;
435
436                 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
437                         /* panic? */;
438                 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
439                                         sizeof(struct hfsplus_cat_file));
440
441                 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
442                                         &file->data_fork : &file->rsrc_fork);
443                 hfsplus_get_perms(inode, &file->permissions, 0);
444                 inode->i_nlink = 1;
445                 if (S_ISREG(inode->i_mode)) {
446                         if (file->permissions.dev)
447                                 inode->i_nlink = be32_to_cpu(file->permissions.dev);
448                         inode->i_op = &hfsplus_file_inode_operations;
449                         inode->i_fop = &hfsplus_file_operations;
450                         inode->i_mapping->a_ops = &hfsplus_aops;
451                 } else if (S_ISLNK(inode->i_mode)) {
452                         inode->i_op = &page_symlink_inode_operations;
453                         inode->i_mapping->a_ops = &hfsplus_aops;
454                 } else {
455                         init_special_inode(inode, inode->i_mode,
456                                            be32_to_cpu(file->permissions.dev));
457                 }
458                 inode->i_atime = hfsp_mt2ut(file->access_date);
459                 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
460                 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
461                 HFSPLUS_I(inode).create_date = file->create_date;
462         } else {
463                 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
464                 res = -EIO;
465         }
466         return res;
467 }
468
469 int hfsplus_cat_write_inode(struct inode *inode)
470 {
471         struct inode *main_inode = inode;
472         struct hfs_find_data fd;
473         hfsplus_cat_entry entry;
474
475         if (HFSPLUS_IS_RSRC(inode))
476                 main_inode = HFSPLUS_I(inode).rsrc_inode;
477
478         if (!main_inode->i_nlink)
479                 return 0;
480
481         if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd))
482                 /* panic? */
483                 return -EIO;
484
485         if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
486                 /* panic? */
487                 goto out;
488
489         if (S_ISDIR(main_inode->i_mode)) {
490                 struct hfsplus_cat_folder *folder = &entry.folder;
491
492                 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
493                         /* panic? */;
494                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
495                                         sizeof(struct hfsplus_cat_folder));
496                 /* simple node checks? */
497                 hfsplus_set_perms(inode, &folder->permissions);
498                 folder->access_date = hfsp_ut2mt(inode->i_atime);
499                 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
500                 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
501                 folder->valence = cpu_to_be32(inode->i_size - 2);
502                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
503                                          sizeof(struct hfsplus_cat_folder));
504         } else if (HFSPLUS_IS_RSRC(inode)) {
505                 struct hfsplus_cat_file *file = &entry.file;
506                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
507                                sizeof(struct hfsplus_cat_file));
508                 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
509                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
510                                 sizeof(struct hfsplus_cat_file));
511         } else {
512                 struct hfsplus_cat_file *file = &entry.file;
513
514                 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
515                         /* panic? */;
516                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
517                                         sizeof(struct hfsplus_cat_file));
518                 hfsplus_inode_write_fork(inode, &file->data_fork);
519                 if (S_ISREG(inode->i_mode))
520                         HFSPLUS_I(inode).dev = inode->i_nlink;
521                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
522                         HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
523                 hfsplus_set_perms(inode, &file->permissions);
524                 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
525                         file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
526                 else
527                         file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
528                 file->access_date = hfsp_ut2mt(inode->i_atime);
529                 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
530                 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
531                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
532                                          sizeof(struct hfsplus_cat_file));
533         }
534 out:
535         hfs_find_exit(&fd);
536         return 0;
537 }