NFS: Add helper functions for allocating filehandles and fattr structs
[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 const 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_file_open(struct inode *inode, struct file *file)
242 {
243         if (HFSPLUS_IS_RSRC(inode))
244                 inode = HFSPLUS_I(inode).rsrc_inode;
245         if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
246                 return -EOVERFLOW;
247         atomic_inc(&HFSPLUS_I(inode).opencnt);
248         return 0;
249 }
250
251 static int hfsplus_file_release(struct inode *inode, struct file *file)
252 {
253         struct super_block *sb = inode->i_sb;
254
255         if (HFSPLUS_IS_RSRC(inode))
256                 inode = HFSPLUS_I(inode).rsrc_inode;
257         if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
258                 mutex_lock(&inode->i_mutex);
259                 hfsplus_file_truncate(inode);
260                 if (inode->i_flags & S_DEAD) {
261                         hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
262                         hfsplus_delete_inode(inode);
263                 }
264                 mutex_unlock(&inode->i_mutex);
265         }
266         return 0;
267 }
268
269 static const struct inode_operations hfsplus_file_inode_operations = {
270         .lookup         = hfsplus_file_lookup,
271         .truncate       = hfsplus_file_truncate,
272         .setxattr       = hfsplus_setxattr,
273         .getxattr       = hfsplus_getxattr,
274         .listxattr      = hfsplus_listxattr,
275 };
276
277 static const struct file_operations hfsplus_file_operations = {
278         .llseek         = generic_file_llseek,
279         .read           = do_sync_read,
280         .aio_read       = generic_file_aio_read,
281         .write          = do_sync_write,
282         .aio_write      = generic_file_aio_write,
283         .mmap           = generic_file_mmap,
284         .splice_read    = generic_file_splice_read,
285         .fsync          = file_fsync,
286         .open           = hfsplus_file_open,
287         .release        = hfsplus_file_release,
288         .ioctl          = hfsplus_ioctl,
289 };
290
291 struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
292 {
293         struct inode *inode = new_inode(sb);
294         if (!inode)
295                 return NULL;
296
297         inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
298         inode->i_mode = mode;
299         inode->i_uid = current_fsuid();
300         inode->i_gid = current_fsgid();
301         inode->i_nlink = 1;
302         inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
303         INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
304         mutex_init(&HFSPLUS_I(inode).extents_lock);
305         atomic_set(&HFSPLUS_I(inode).opencnt, 0);
306         HFSPLUS_I(inode).flags = 0;
307         memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
308         memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
309         HFSPLUS_I(inode).alloc_blocks = 0;
310         HFSPLUS_I(inode).first_blocks = 0;
311         HFSPLUS_I(inode).cached_start = 0;
312         HFSPLUS_I(inode).cached_blocks = 0;
313         HFSPLUS_I(inode).phys_size = 0;
314         HFSPLUS_I(inode).fs_blocks = 0;
315         HFSPLUS_I(inode).rsrc_inode = NULL;
316         if (S_ISDIR(inode->i_mode)) {
317                 inode->i_size = 2;
318                 HFSPLUS_SB(sb).folder_count++;
319                 inode->i_op = &hfsplus_dir_inode_operations;
320                 inode->i_fop = &hfsplus_dir_operations;
321         } else if (S_ISREG(inode->i_mode)) {
322                 HFSPLUS_SB(sb).file_count++;
323                 inode->i_op = &hfsplus_file_inode_operations;
324                 inode->i_fop = &hfsplus_file_operations;
325                 inode->i_mapping->a_ops = &hfsplus_aops;
326                 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
327         } else if (S_ISLNK(inode->i_mode)) {
328                 HFSPLUS_SB(sb).file_count++;
329                 inode->i_op = &page_symlink_inode_operations;
330                 inode->i_mapping->a_ops = &hfsplus_aops;
331                 HFSPLUS_I(inode).clump_blocks = 1;
332         } else
333                 HFSPLUS_SB(sb).file_count++;
334         insert_inode_hash(inode);
335         mark_inode_dirty(inode);
336         sb->s_dirt = 1;
337
338         return inode;
339 }
340
341 void hfsplus_delete_inode(struct inode *inode)
342 {
343         struct super_block *sb = inode->i_sb;
344
345         if (S_ISDIR(inode->i_mode)) {
346                 HFSPLUS_SB(sb).folder_count--;
347                 sb->s_dirt = 1;
348                 return;
349         }
350         HFSPLUS_SB(sb).file_count--;
351         if (S_ISREG(inode->i_mode)) {
352                 if (!inode->i_nlink) {
353                         inode->i_size = 0;
354                         hfsplus_file_truncate(inode);
355                 }
356         } else if (S_ISLNK(inode->i_mode)) {
357                 inode->i_size = 0;
358                 hfsplus_file_truncate(inode);
359         }
360         sb->s_dirt = 1;
361 }
362
363 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
364 {
365         struct super_block *sb = inode->i_sb;
366         u32 count;
367         int i;
368
369         memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
370                sizeof(hfsplus_extent_rec));
371         for (count = 0, i = 0; i < 8; i++)
372                 count += be32_to_cpu(fork->extents[i].block_count);
373         HFSPLUS_I(inode).first_blocks = count;
374         memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
375         HFSPLUS_I(inode).cached_start = 0;
376         HFSPLUS_I(inode).cached_blocks = 0;
377
378         HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
379         inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
380         HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
381         inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
382         HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
383         if (!HFSPLUS_I(inode).clump_blocks)
384                 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
385                                 HFSPLUS_SB(sb).data_clump_blocks;
386 }
387
388 void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
389 {
390         memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
391                sizeof(hfsplus_extent_rec));
392         fork->total_size = cpu_to_be64(inode->i_size);
393         fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
394 }
395
396 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
397 {
398         hfsplus_cat_entry entry;
399         int res = 0;
400         u16 type;
401
402         type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
403
404         HFSPLUS_I(inode).dev = 0;
405         if (type == HFSPLUS_FOLDER) {
406                 struct hfsplus_cat_folder *folder = &entry.folder;
407
408                 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
409                         /* panic? */;
410                 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
411                                         sizeof(struct hfsplus_cat_folder));
412                 hfsplus_get_perms(inode, &folder->permissions, 1);
413                 inode->i_nlink = 1;
414                 inode->i_size = 2 + be32_to_cpu(folder->valence);
415                 inode->i_atime = hfsp_mt2ut(folder->access_date);
416                 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
417                 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
418                 HFSPLUS_I(inode).create_date = folder->create_date;
419                 HFSPLUS_I(inode).fs_blocks = 0;
420                 inode->i_op = &hfsplus_dir_inode_operations;
421                 inode->i_fop = &hfsplus_dir_operations;
422         } else if (type == HFSPLUS_FILE) {
423                 struct hfsplus_cat_file *file = &entry.file;
424
425                 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
426                         /* panic? */;
427                 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
428                                         sizeof(struct hfsplus_cat_file));
429
430                 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
431                                         &file->data_fork : &file->rsrc_fork);
432                 hfsplus_get_perms(inode, &file->permissions, 0);
433                 inode->i_nlink = 1;
434                 if (S_ISREG(inode->i_mode)) {
435                         if (file->permissions.dev)
436                                 inode->i_nlink = be32_to_cpu(file->permissions.dev);
437                         inode->i_op = &hfsplus_file_inode_operations;
438                         inode->i_fop = &hfsplus_file_operations;
439                         inode->i_mapping->a_ops = &hfsplus_aops;
440                 } else if (S_ISLNK(inode->i_mode)) {
441                         inode->i_op = &page_symlink_inode_operations;
442                         inode->i_mapping->a_ops = &hfsplus_aops;
443                 } else {
444                         init_special_inode(inode, inode->i_mode,
445                                            be32_to_cpu(file->permissions.dev));
446                 }
447                 inode->i_atime = hfsp_mt2ut(file->access_date);
448                 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
449                 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
450                 HFSPLUS_I(inode).create_date = file->create_date;
451         } else {
452                 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
453                 res = -EIO;
454         }
455         return res;
456 }
457
458 int hfsplus_cat_write_inode(struct inode *inode)
459 {
460         struct inode *main_inode = inode;
461         struct hfs_find_data fd;
462         hfsplus_cat_entry entry;
463
464         if (HFSPLUS_IS_RSRC(inode))
465                 main_inode = HFSPLUS_I(inode).rsrc_inode;
466
467         if (!main_inode->i_nlink)
468                 return 0;
469
470         if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd))
471                 /* panic? */
472                 return -EIO;
473
474         if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
475                 /* panic? */
476                 goto out;
477
478         if (S_ISDIR(main_inode->i_mode)) {
479                 struct hfsplus_cat_folder *folder = &entry.folder;
480
481                 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
482                         /* panic? */;
483                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
484                                         sizeof(struct hfsplus_cat_folder));
485                 /* simple node checks? */
486                 hfsplus_set_perms(inode, &folder->permissions);
487                 folder->access_date = hfsp_ut2mt(inode->i_atime);
488                 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
489                 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
490                 folder->valence = cpu_to_be32(inode->i_size - 2);
491                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
492                                          sizeof(struct hfsplus_cat_folder));
493         } else if (HFSPLUS_IS_RSRC(inode)) {
494                 struct hfsplus_cat_file *file = &entry.file;
495                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
496                                sizeof(struct hfsplus_cat_file));
497                 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
498                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
499                                 sizeof(struct hfsplus_cat_file));
500         } else {
501                 struct hfsplus_cat_file *file = &entry.file;
502
503                 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
504                         /* panic? */;
505                 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
506                                         sizeof(struct hfsplus_cat_file));
507                 hfsplus_inode_write_fork(inode, &file->data_fork);
508                 if (S_ISREG(inode->i_mode))
509                         HFSPLUS_I(inode).dev = inode->i_nlink;
510                 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
511                         HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
512                 hfsplus_set_perms(inode, &file->permissions);
513                 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
514                         file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
515                 else
516                         file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
517                 file->access_date = hfsp_ut2mt(inode->i_atime);
518                 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
519                 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
520                 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
521                                          sizeof(struct hfsplus_cat_file));
522         }
523 out:
524         hfs_find_exit(&fd);
525         return 0;
526 }