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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
20static int hfsplus_readpage(struct file *file, struct page *page)
21{
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 return block_write_full_page(page, hfsplus_get_block, wbc);
28}
29
30static 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
40static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
41{
42 return generic_block_bmap(mapping, block, hfsplus_get_block);
43}
44
45static 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->node_size >= PAGE_CACHE_SIZE) {
69 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
70 spin_lock(&tree->hash_lock);
71 node = hfs_bnode_findhash(tree, nidx);
72 if (!node)
73 ;
74 else if (atomic_read(&node->refcnt))
75 res = 0;
76 if (res && node) {
77 hfs_bnode_unhash(node);
78 hfs_bnode_free(node);
79 }
80 spin_unlock(&tree->hash_lock);
81 } else {
82 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
83 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
84 spin_lock(&tree->hash_lock);
85 do {
86 node = hfs_bnode_findhash(tree, nidx++);
87 if (!node)
88 continue;
89 if (atomic_read(&node->refcnt)) {
90 res = 0;
91 break;
92 }
93 hfs_bnode_unhash(node);
94 hfs_bnode_free(node);
95 } while (--i && nidx < tree->node_count);
96 spin_unlock(&tree->hash_lock);
97 }
98 return res ? try_to_free_buffers(page) : 0;
99}
100
101static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
102 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
103{
104 struct file *file = iocb->ki_filp;
105 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
106
107 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
108 offset, nr_segs, hfsplus_get_block, NULL);
109}
110
111static int hfsplus_writepages(struct address_space *mapping,
112 struct writeback_control *wbc)
113{
114 return mpage_writepages(mapping, wbc, hfsplus_get_block);
115}
116
117const struct address_space_operations hfsplus_btree_aops = {
118 .readpage = hfsplus_readpage,
119 .writepage = hfsplus_writepage,
120 .sync_page = block_sync_page,
121 .write_begin = hfsplus_write_begin,
122 .write_end = generic_write_end,
123 .bmap = hfsplus_bmap,
124 .releasepage = hfsplus_releasepage,
125};
126
127const struct address_space_operations hfsplus_aops = {
128 .readpage = hfsplus_readpage,
129 .writepage = hfsplus_writepage,
130 .sync_page = block_sync_page,
131 .write_begin = hfsplus_write_begin,
132 .write_end = generic_write_end,
133 .bmap = hfsplus_bmap,
134 .direct_IO = hfsplus_direct_IO,
135 .writepages = hfsplus_writepages,
136};
137
138struct dentry_operations hfsplus_dentry_operations = {
139 .d_hash = hfsplus_hash_dentry,
140 .d_compare = hfsplus_compare_dentry,
141};
142
143static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry,
144 struct nameidata *nd)
145{
146 struct hfs_find_data fd;
147 struct super_block *sb = dir->i_sb;
148 struct inode *inode = NULL;
149 int err;
150
151 if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
152 goto out;
153
154 inode = HFSPLUS_I(dir).rsrc_inode;
155 if (inode)
156 goto out;
157
158 inode = new_inode(sb);
159 if (!inode)
160 return ERR_PTR(-ENOMEM);
161
162 inode->i_ino = dir->i_ino;
163 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
164 init_MUTEX(&HFSPLUS_I(inode).extents_lock);
165 HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
166
167 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
168 err = hfsplus_find_cat(sb, dir->i_ino, &fd);
169 if (!err)
170 err = hfsplus_cat_read_inode(inode, &fd);
171 hfs_find_exit(&fd);
172 if (err) {
173 iput(inode);
174 return ERR_PTR(err);
175 }
176 HFSPLUS_I(inode).rsrc_inode = dir;
177 HFSPLUS_I(dir).rsrc_inode = inode;
178 igrab(dir);
179 hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
180 mark_inode_dirty(inode);
181out:
182 d_add(dentry, inode);
183 return NULL;
184}
185
186static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir)
187{
188 struct super_block *sb = inode->i_sb;
189 u16 mode;
190
191 mode = be16_to_cpu(perms->mode);
192
193 inode->i_uid = be32_to_cpu(perms->owner);
194 if (!inode->i_uid && !mode)
195 inode->i_uid = HFSPLUS_SB(sb).uid;
196
197 inode->i_gid = be32_to_cpu(perms->group);
198 if (!inode->i_gid && !mode)
199 inode->i_gid = HFSPLUS_SB(sb).gid;
200
201 if (dir) {
202 mode = mode ? (mode & S_IALLUGO) :
203 (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
204 mode |= S_IFDIR;
205 } else if (!mode)
206 mode = S_IFREG | ((S_IRUGO|S_IWUGO) &
207 ~(HFSPLUS_SB(sb).umask));
208 inode->i_mode = mode;
209
210 HFSPLUS_I(inode).rootflags = perms->rootflags;
211 HFSPLUS_I(inode).userflags = perms->userflags;
212 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
213 inode->i_flags |= S_IMMUTABLE;
214 else
215 inode->i_flags &= ~S_IMMUTABLE;
216 if (perms->rootflags & HFSPLUS_FLG_APPEND)
217 inode->i_flags |= S_APPEND;
218 else
219 inode->i_flags &= ~S_APPEND;
220}
221
222static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
223{
224 if (inode->i_flags & S_IMMUTABLE)
225 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
226 else
227 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
228 if (inode->i_flags & S_APPEND)
229 perms->rootflags |= HFSPLUS_FLG_APPEND;
230 else
231 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
232 perms->userflags = HFSPLUS_I(inode).userflags;
233 perms->mode = cpu_to_be16(inode->i_mode);
234 perms->owner = cpu_to_be32(inode->i_uid);
235 perms->group = cpu_to_be32(inode->i_gid);
236 perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
237}
238
239static int hfsplus_permission(struct inode *inode, int mask, struct nameidata *nd)
240{
241
242
243
244
245 if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111))
246 return 0;
247 return generic_permission(inode, mask, NULL);
248}
249
250
251static int hfsplus_file_open(struct inode *inode, struct file *file)
252{
253 if (HFSPLUS_IS_RSRC(inode))
254 inode = HFSPLUS_I(inode).rsrc_inode;
255 if (atomic_read(&file->f_count) != 1)
256 return 0;
257 atomic_inc(&HFSPLUS_I(inode).opencnt);
258 return 0;
259}
260
261static 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_read(&file->f_count) != 0)
268 return 0;
269 if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
270 mutex_lock(&inode->i_mutex);
271 hfsplus_file_truncate(inode);
272 if (inode->i_flags & S_DEAD) {
273 hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
274 hfsplus_delete_inode(inode);
275 }
276 mutex_unlock(&inode->i_mutex);
277 }
278 return 0;
279}
280
281extern const struct inode_operations hfsplus_dir_inode_operations;
282extern struct file_operations hfsplus_dir_operations;
283
284static const struct inode_operations hfsplus_file_inode_operations = {
285 .lookup = hfsplus_file_lookup,
286 .truncate = hfsplus_file_truncate,
287 .permission = hfsplus_permission,
288 .setxattr = hfsplus_setxattr,
289 .getxattr = hfsplus_getxattr,
290 .listxattr = hfsplus_listxattr,
291};
292
293static const struct file_operations hfsplus_file_operations = {
294 .llseek = generic_file_llseek,
295 .read = do_sync_read,
296 .aio_read = generic_file_aio_read,
297 .write = do_sync_write,
298 .aio_write = generic_file_aio_write,
299 .mmap = generic_file_mmap,
300 .splice_read = generic_file_splice_read,
301 .fsync = file_fsync,
302 .open = hfsplus_file_open,
303 .release = hfsplus_file_release,
304 .ioctl = hfsplus_ioctl,
305};
306
307struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
308{
309 struct inode *inode = new_inode(sb);
310 if (!inode)
311 return NULL;
312
313 inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
314 inode->i_mode = mode;
315 inode->i_uid = current->fsuid;
316 inode->i_gid = current->fsgid;
317 inode->i_nlink = 1;
318 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
319 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
320 init_MUTEX(&HFSPLUS_I(inode).extents_lock);
321 atomic_set(&HFSPLUS_I(inode).opencnt, 0);
322 HFSPLUS_I(inode).flags = 0;
323 memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
324 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
325 HFSPLUS_I(inode).alloc_blocks = 0;
326 HFSPLUS_I(inode).first_blocks = 0;
327 HFSPLUS_I(inode).cached_start = 0;
328 HFSPLUS_I(inode).cached_blocks = 0;
329 HFSPLUS_I(inode).phys_size = 0;
330 HFSPLUS_I(inode).fs_blocks = 0;
331 HFSPLUS_I(inode).rsrc_inode = NULL;
332 if (S_ISDIR(inode->i_mode)) {
333 inode->i_size = 2;
334 HFSPLUS_SB(sb).folder_count++;
335 inode->i_op = &hfsplus_dir_inode_operations;
336 inode->i_fop = &hfsplus_dir_operations;
337 } else if (S_ISREG(inode->i_mode)) {
338 HFSPLUS_SB(sb).file_count++;
339 inode->i_op = &hfsplus_file_inode_operations;
340 inode->i_fop = &hfsplus_file_operations;
341 inode->i_mapping->a_ops = &hfsplus_aops;
342 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
343 } else if (S_ISLNK(inode->i_mode)) {
344 HFSPLUS_SB(sb).file_count++;
345 inode->i_op = &page_symlink_inode_operations;
346 inode->i_mapping->a_ops = &hfsplus_aops;
347 HFSPLUS_I(inode).clump_blocks = 1;
348 } else
349 HFSPLUS_SB(sb).file_count++;
350 insert_inode_hash(inode);
351 mark_inode_dirty(inode);
352 sb->s_dirt = 1;
353
354 return inode;
355}
356
357void hfsplus_delete_inode(struct inode *inode)
358{
359 struct super_block *sb = inode->i_sb;
360
361 if (S_ISDIR(inode->i_mode)) {
362 HFSPLUS_SB(sb).folder_count--;
363 sb->s_dirt = 1;
364 return;
365 }
366 HFSPLUS_SB(sb).file_count--;
367 if (S_ISREG(inode->i_mode)) {
368 if (!inode->i_nlink) {
369 inode->i_size = 0;
370 hfsplus_file_truncate(inode);
371 }
372 } else if (S_ISLNK(inode->i_mode)) {
373 inode->i_size = 0;
374 hfsplus_file_truncate(inode);
375 }
376 sb->s_dirt = 1;
377}
378
379void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
380{
381 struct super_block *sb = inode->i_sb;
382 u32 count;
383 int i;
384
385 memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
386 sizeof(hfsplus_extent_rec));
387 for (count = 0, i = 0; i < 8; i++)
388 count += be32_to_cpu(fork->extents[i].block_count);
389 HFSPLUS_I(inode).first_blocks = count;
390 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
391 HFSPLUS_I(inode).cached_start = 0;
392 HFSPLUS_I(inode).cached_blocks = 0;
393
394 HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
395 inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
396 HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
397 inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
398 HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
399 if (!HFSPLUS_I(inode).clump_blocks)
400 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
401 HFSPLUS_SB(sb).data_clump_blocks;
402}
403
404void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
405{
406 memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
407 sizeof(hfsplus_extent_rec));
408 fork->total_size = cpu_to_be64(inode->i_size);
409 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
410}
411
412int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
413{
414 hfsplus_cat_entry entry;
415 int res = 0;
416 u16 type;
417
418 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
419
420 HFSPLUS_I(inode).dev = 0;
421 if (type == HFSPLUS_FOLDER) {
422 struct hfsplus_cat_folder *folder = &entry.folder;
423
424 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
425 ;
426 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
427 sizeof(struct hfsplus_cat_folder));
428 hfsplus_get_perms(inode, &folder->permissions, 1);
429 inode->i_nlink = 1;
430 inode->i_size = 2 + be32_to_cpu(folder->valence);
431 inode->i_atime = hfsp_mt2ut(folder->access_date);
432 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
433 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
434 HFSPLUS_I(inode).create_date = folder->create_date;
435 HFSPLUS_I(inode).fs_blocks = 0;
436 inode->i_op = &hfsplus_dir_inode_operations;
437 inode->i_fop = &hfsplus_dir_operations;
438 } else if (type == HFSPLUS_FILE) {
439 struct hfsplus_cat_file *file = &entry.file;
440
441 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
442 ;
443 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
444 sizeof(struct hfsplus_cat_file));
445
446 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
447 &file->data_fork : &file->rsrc_fork);
448 hfsplus_get_perms(inode, &file->permissions, 0);
449 inode->i_nlink = 1;
450 if (S_ISREG(inode->i_mode)) {
451 if (file->permissions.dev)
452 inode->i_nlink = be32_to_cpu(file->permissions.dev);
453 inode->i_op = &hfsplus_file_inode_operations;
454 inode->i_fop = &hfsplus_file_operations;
455 inode->i_mapping->a_ops = &hfsplus_aops;
456 } else if (S_ISLNK(inode->i_mode)) {
457 inode->i_op = &page_symlink_inode_operations;
458 inode->i_mapping->a_ops = &hfsplus_aops;
459 } else {
460 init_special_inode(inode, inode->i_mode,
461 be32_to_cpu(file->permissions.dev));
462 }
463 inode->i_atime = hfsp_mt2ut(file->access_date);
464 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
465 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
466 HFSPLUS_I(inode).create_date = file->create_date;
467 } else {
468 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
469 res = -EIO;
470 }
471 return res;
472}
473
474int hfsplus_cat_write_inode(struct inode *inode)
475{
476 struct inode *main_inode = inode;
477 struct hfs_find_data fd;
478 hfsplus_cat_entry entry;
479
480 if (HFSPLUS_IS_RSRC(inode))
481 main_inode = HFSPLUS_I(inode).rsrc_inode;
482
483 if (!main_inode->i_nlink)
484 return 0;
485
486 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd))
487
488 return -EIO;
489
490 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
491
492 goto out;
493
494 if (S_ISDIR(main_inode->i_mode)) {
495 struct hfsplus_cat_folder *folder = &entry.folder;
496
497 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
498 ;
499 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
500 sizeof(struct hfsplus_cat_folder));
501
502 hfsplus_set_perms(inode, &folder->permissions);
503 folder->access_date = hfsp_ut2mt(inode->i_atime);
504 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
505 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
506 folder->valence = cpu_to_be32(inode->i_size - 2);
507 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
508 sizeof(struct hfsplus_cat_folder));
509 } else if (HFSPLUS_IS_RSRC(inode)) {
510 struct hfsplus_cat_file *file = &entry.file;
511 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
512 sizeof(struct hfsplus_cat_file));
513 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
514 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
515 sizeof(struct hfsplus_cat_file));
516 } else {
517 struct hfsplus_cat_file *file = &entry.file;
518
519 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
520 ;
521 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
522 sizeof(struct hfsplus_cat_file));
523 hfsplus_inode_write_fork(inode, &file->data_fork);
524 if (S_ISREG(inode->i_mode))
525 HFSPLUS_I(inode).dev = inode->i_nlink;
526 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
527 HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
528 hfsplus_set_perms(inode, &file->permissions);
529 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
530 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
531 else
532 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
533 file->access_date = hfsp_ut2mt(inode->i_atime);
534 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
535 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
536 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
537 sizeof(struct hfsplus_cat_file));
538 }
539out:
540 hfs_find_exit(&fd);
541 return 0;
542}
543
