1
2
3
4
5
6
7
8
9
10
11#include <linux/blkdev.h>
12#include <linux/mm.h>
13#include <linux/fs.h>
14#include <linux/pagemap.h>
15#include <linux/mpage.h>
16#include <linux/sched.h>
17
18#include "hfsplus_fs.h"
19#include "hfsplus_raw.h"
20
21static int hfsplus_readpage(struct file *file, struct page *page)
22{
23 return block_read_full_page(page, hfsplus_get_block);
24}
25
26static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
27{
28 return block_write_full_page(page, hfsplus_get_block, wbc);
29}
30
31static int hfsplus_write_begin(struct file *file, struct address_space *mapping,
32 loff_t pos, unsigned len, unsigned flags,
33 struct page **pagep, void **fsdata)
34{
35 int ret;
36
37 *pagep = NULL;
38 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
39 hfsplus_get_block,
40 &HFSPLUS_I(mapping->host)->phys_size);
41 if (unlikely(ret)) {
42 loff_t isize = mapping->host->i_size;
43 if (pos + len > isize)
44 vmtruncate(mapping->host, isize);
45 }
46
47 return ret;
48}
49
50static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
51{
52 return generic_block_bmap(mapping, block, hfsplus_get_block);
53}
54
55static int hfsplus_releasepage(struct page *page, gfp_t mask)
56{
57 struct inode *inode = page->mapping->host;
58 struct super_block *sb = inode->i_sb;
59 struct hfs_btree *tree;
60 struct hfs_bnode *node;
61 u32 nidx;
62 int i, res = 1;
63
64 switch (inode->i_ino) {
65 case HFSPLUS_EXT_CNID:
66 tree = HFSPLUS_SB(sb)->ext_tree;
67 break;
68 case HFSPLUS_CAT_CNID:
69 tree = HFSPLUS_SB(sb)->cat_tree;
70 break;
71 case HFSPLUS_ATTR_CNID:
72 tree = HFSPLUS_SB(sb)->attr_tree;
73 break;
74 default:
75 BUG();
76 return 0;
77 }
78 if (!tree)
79 return 0;
80 if (tree->node_size >= PAGE_CACHE_SIZE) {
81 nidx = page->index >>
82 (tree->node_size_shift - PAGE_CACHE_SHIFT);
83 spin_lock(&tree->hash_lock);
84 node = hfs_bnode_findhash(tree, nidx);
85 if (!node)
86 ;
87 else if (atomic_read(&node->refcnt))
88 res = 0;
89 if (res && node) {
90 hfs_bnode_unhash(node);
91 hfs_bnode_free(node);
92 }
93 spin_unlock(&tree->hash_lock);
94 } else {
95 nidx = page->index <<
96 (PAGE_CACHE_SHIFT - tree->node_size_shift);
97 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
98 spin_lock(&tree->hash_lock);
99 do {
100 node = hfs_bnode_findhash(tree, nidx++);
101 if (!node)
102 continue;
103 if (atomic_read(&node->refcnt)) {
104 res = 0;
105 break;
106 }
107 hfs_bnode_unhash(node);
108 hfs_bnode_free(node);
109 } while (--i && nidx < tree->node_count);
110 spin_unlock(&tree->hash_lock);
111 }
112 return res ? try_to_free_buffers(page) : 0;
113}
114
115static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
116 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
117{
118 struct file *file = iocb->ki_filp;
119 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
120 ssize_t ret;
121
122 ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
123 hfsplus_get_block);
124
125
126
127
128
129 if (unlikely((rw & WRITE) && ret < 0)) {
130 loff_t isize = i_size_read(inode);
131 loff_t end = offset + iov_length(iov, nr_segs);
132
133 if (end > isize)
134 vmtruncate(inode, isize);
135 }
136
137 return ret;
138}
139
140static int hfsplus_writepages(struct address_space *mapping,
141 struct writeback_control *wbc)
142{
143 return mpage_writepages(mapping, wbc, hfsplus_get_block);
144}
145
146const struct address_space_operations hfsplus_btree_aops = {
147 .readpage = hfsplus_readpage,
148 .writepage = hfsplus_writepage,
149 .write_begin = hfsplus_write_begin,
150 .write_end = generic_write_end,
151 .bmap = hfsplus_bmap,
152 .releasepage = hfsplus_releasepage,
153};
154
155const struct address_space_operations hfsplus_aops = {
156 .readpage = hfsplus_readpage,
157 .writepage = hfsplus_writepage,
158 .write_begin = hfsplus_write_begin,
159 .write_end = generic_write_end,
160 .bmap = hfsplus_bmap,
161 .direct_IO = hfsplus_direct_IO,
162 .writepages = hfsplus_writepages,
163};
164
165const struct dentry_operations hfsplus_dentry_operations = {
166 .d_hash = hfsplus_hash_dentry,
167 .d_compare = hfsplus_compare_dentry,
168};
169
170static struct dentry *hfsplus_file_lookup(struct inode *dir,
171 struct dentry *dentry, struct nameidata *nd)
172{
173 struct hfs_find_data fd;
174 struct super_block *sb = dir->i_sb;
175 struct inode *inode = NULL;
176 struct hfsplus_inode_info *hip;
177 int err;
178
179 if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
180 goto out;
181
182 inode = HFSPLUS_I(dir)->rsrc_inode;
183 if (inode)
184 goto out;
185
186 inode = new_inode(sb);
187 if (!inode)
188 return ERR_PTR(-ENOMEM);
189
190 hip = HFSPLUS_I(inode);
191 inode->i_ino = dir->i_ino;
192 INIT_LIST_HEAD(&hip->open_dir_list);
193 mutex_init(&hip->extents_lock);
194 hip->extent_state = 0;
195 hip->flags = 0;
196 set_bit(HFSPLUS_I_RSRC, &hip->flags);
197
198 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
199 if (!err) {
200 err = hfsplus_find_cat(sb, dir->i_ino, &fd);
201 if (!err)
202 err = hfsplus_cat_read_inode(inode, &fd);
203 hfs_find_exit(&fd);
204 }
205 if (err) {
206 iput(inode);
207 return ERR_PTR(err);
208 }
209 hip->rsrc_inode = dir;
210 HFSPLUS_I(dir)->rsrc_inode = inode;
211 igrab(dir);
212
213
214
215
216
217
218
219 hlist_add_fake(&inode->i_hash);
220
221 mark_inode_dirty(inode);
222out:
223 d_add(dentry, inode);
224 return NULL;
225}
226
227static void hfsplus_get_perms(struct inode *inode,
228 struct hfsplus_perm *perms, int dir)
229{
230 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
231 u16 mode;
232
233 mode = be16_to_cpu(perms->mode);
234
235 inode->i_uid = be32_to_cpu(perms->owner);
236 if (!inode->i_uid && !mode)
237 inode->i_uid = sbi->uid;
238
239 inode->i_gid = be32_to_cpu(perms->group);
240 if (!inode->i_gid && !mode)
241 inode->i_gid = sbi->gid;
242
243 if (dir) {
244 mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask));
245 mode |= S_IFDIR;
246 } else if (!mode)
247 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->umask));
248 inode->i_mode = mode;
249
250 HFSPLUS_I(inode)->userflags = perms->userflags;
251 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
252 inode->i_flags |= S_IMMUTABLE;
253 else
254 inode->i_flags &= ~S_IMMUTABLE;
255 if (perms->rootflags & HFSPLUS_FLG_APPEND)
256 inode->i_flags |= S_APPEND;
257 else
258 inode->i_flags &= ~S_APPEND;
259}
260
261static int hfsplus_file_open(struct inode *inode, struct file *file)
262{
263 if (HFSPLUS_IS_RSRC(inode))
264 inode = HFSPLUS_I(inode)->rsrc_inode;
265 if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
266 return -EOVERFLOW;
267 atomic_inc(&HFSPLUS_I(inode)->opencnt);
268 return 0;
269}
270
271static int hfsplus_file_release(struct inode *inode, struct file *file)
272{
273 struct super_block *sb = inode->i_sb;
274
275 if (HFSPLUS_IS_RSRC(inode))
276 inode = HFSPLUS_I(inode)->rsrc_inode;
277 if (atomic_dec_and_test(&HFSPLUS_I(inode)->opencnt)) {
278 mutex_lock(&inode->i_mutex);
279 hfsplus_file_truncate(inode);
280 if (inode->i_flags & S_DEAD) {
281 hfsplus_delete_cat(inode->i_ino,
282 HFSPLUS_SB(sb)->hidden_dir, NULL);
283 hfsplus_delete_inode(inode);
284 }
285 mutex_unlock(&inode->i_mutex);
286 }
287 return 0;
288}
289
290static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
291{
292 struct inode *inode = dentry->d_inode;
293 int error;
294
295 error = inode_change_ok(inode, attr);
296 if (error)
297 return error;
298
299 if ((attr->ia_valid & ATTR_SIZE) &&
300 attr->ia_size != i_size_read(inode)) {
301 inode_dio_wait(inode);
302
303 error = vmtruncate(inode, attr->ia_size);
304 if (error)
305 return error;
306 }
307
308 setattr_copy(inode, attr);
309 mark_inode_dirty(inode);
310 return 0;
311}
312
313int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
314 int datasync)
315{
316 struct inode *inode = file->f_mapping->host;
317 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
318 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
319 int error = 0, error2;
320
321 error = filemap_write_and_wait_range(inode->i_mapping, start, end);
322 if (error)
323 return error;
324 mutex_lock(&inode->i_mutex);
325
326
327
328
329 sync_inode_metadata(inode, 1);
330
331
332
333
334 if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags))
335 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
336
337 if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) {
338 error2 =
339 filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
340 if (!error)
341 error = error2;
342 }
343
344 if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) {
345 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
346 if (!error)
347 error = error2;
348 }
349
350 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
351 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
352
353 mutex_unlock(&inode->i_mutex);
354
355 return error;
356}
357
358static const struct inode_operations hfsplus_file_inode_operations = {
359 .lookup = hfsplus_file_lookup,
360 .truncate = hfsplus_file_truncate,
361 .setattr = hfsplus_setattr,
362 .setxattr = hfsplus_setxattr,
363 .getxattr = hfsplus_getxattr,
364 .listxattr = hfsplus_listxattr,
365};
366
367static const struct file_operations hfsplus_file_operations = {
368 .llseek = generic_file_llseek,
369 .read = do_sync_read,
370 .aio_read = generic_file_aio_read,
371 .write = do_sync_write,
372 .aio_write = generic_file_aio_write,
373 .mmap = generic_file_mmap,
374 .splice_read = generic_file_splice_read,
375 .fsync = hfsplus_file_fsync,
376 .open = hfsplus_file_open,
377 .release = hfsplus_file_release,
378 .unlocked_ioctl = hfsplus_ioctl,
379};
380
381struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
382{
383 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
384 struct inode *inode = new_inode(sb);
385 struct hfsplus_inode_info *hip;
386
387 if (!inode)
388 return NULL;
389
390 inode->i_ino = sbi->next_cnid++;
391 inode->i_mode = mode;
392 inode->i_uid = current_fsuid();
393 inode->i_gid = current_fsgid();
394 set_nlink(inode, 1);
395 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
396
397 hip = HFSPLUS_I(inode);
398 INIT_LIST_HEAD(&hip->open_dir_list);
399 mutex_init(&hip->extents_lock);
400 atomic_set(&hip->opencnt, 0);
401 hip->extent_state = 0;
402 hip->flags = 0;
403 memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
404 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
405 hip->alloc_blocks = 0;
406 hip->first_blocks = 0;
407 hip->cached_start = 0;
408 hip->cached_blocks = 0;
409 hip->phys_size = 0;
410 hip->fs_blocks = 0;
411 hip->rsrc_inode = NULL;
412 if (S_ISDIR(inode->i_mode)) {
413 inode->i_size = 2;
414 sbi->folder_count++;
415 inode->i_op = &hfsplus_dir_inode_operations;
416 inode->i_fop = &hfsplus_dir_operations;
417 } else if (S_ISREG(inode->i_mode)) {
418 sbi->file_count++;
419 inode->i_op = &hfsplus_file_inode_operations;
420 inode->i_fop = &hfsplus_file_operations;
421 inode->i_mapping->a_ops = &hfsplus_aops;
422 hip->clump_blocks = sbi->data_clump_blocks;
423 } else if (S_ISLNK(inode->i_mode)) {
424 sbi->file_count++;
425 inode->i_op = &page_symlink_inode_operations;
426 inode->i_mapping->a_ops = &hfsplus_aops;
427 hip->clump_blocks = 1;
428 } else
429 sbi->file_count++;
430 insert_inode_hash(inode);
431 mark_inode_dirty(inode);
432 sb->s_dirt = 1;
433
434 return inode;
435}
436
437void hfsplus_delete_inode(struct inode *inode)
438{
439 struct super_block *sb = inode->i_sb;
440
441 if (S_ISDIR(inode->i_mode)) {
442 HFSPLUS_SB(sb)->folder_count--;
443 sb->s_dirt = 1;
444 return;
445 }
446 HFSPLUS_SB(sb)->file_count--;
447 if (S_ISREG(inode->i_mode)) {
448 if (!inode->i_nlink) {
449 inode->i_size = 0;
450 hfsplus_file_truncate(inode);
451 }
452 } else if (S_ISLNK(inode->i_mode)) {
453 inode->i_size = 0;
454 hfsplus_file_truncate(inode);
455 }
456 sb->s_dirt = 1;
457}
458
459void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
460{
461 struct super_block *sb = inode->i_sb;
462 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
463 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
464 u32 count;
465 int i;
466
467 memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec));
468 for (count = 0, i = 0; i < 8; i++)
469 count += be32_to_cpu(fork->extents[i].block_count);
470 hip->first_blocks = count;
471 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
472 hip->cached_start = 0;
473 hip->cached_blocks = 0;
474
475 hip->alloc_blocks = be32_to_cpu(fork->total_blocks);
476 hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size);
477 hip->fs_blocks =
478 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
479 inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
480 hip->clump_blocks =
481 be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift;
482 if (!hip->clump_blocks) {
483 hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ?
484 sbi->rsrc_clump_blocks :
485 sbi->data_clump_blocks;
486 }
487}
488
489void hfsplus_inode_write_fork(struct inode *inode,
490 struct hfsplus_fork_raw *fork)
491{
492 memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents,
493 sizeof(hfsplus_extent_rec));
494 fork->total_size = cpu_to_be64(inode->i_size);
495 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks);
496}
497
498int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
499{
500 hfsplus_cat_entry entry;
501 int res = 0;
502 u16 type;
503
504 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
505
506 HFSPLUS_I(inode)->linkid = 0;
507 if (type == HFSPLUS_FOLDER) {
508 struct hfsplus_cat_folder *folder = &entry.folder;
509
510 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
511 ;
512 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
513 sizeof(struct hfsplus_cat_folder));
514 hfsplus_get_perms(inode, &folder->permissions, 1);
515 set_nlink(inode, 1);
516 inode->i_size = 2 + be32_to_cpu(folder->valence);
517 inode->i_atime = hfsp_mt2ut(folder->access_date);
518 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
519 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
520 HFSPLUS_I(inode)->create_date = folder->create_date;
521 HFSPLUS_I(inode)->fs_blocks = 0;
522 inode->i_op = &hfsplus_dir_inode_operations;
523 inode->i_fop = &hfsplus_dir_operations;
524 } else if (type == HFSPLUS_FILE) {
525 struct hfsplus_cat_file *file = &entry.file;
526
527 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
528 ;
529 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
530 sizeof(struct hfsplus_cat_file));
531
532 hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ?
533 &file->rsrc_fork : &file->data_fork);
534 hfsplus_get_perms(inode, &file->permissions, 0);
535 set_nlink(inode, 1);
536 if (S_ISREG(inode->i_mode)) {
537 if (file->permissions.dev)
538 set_nlink(inode,
539 be32_to_cpu(file->permissions.dev));
540 inode->i_op = &hfsplus_file_inode_operations;
541 inode->i_fop = &hfsplus_file_operations;
542 inode->i_mapping->a_ops = &hfsplus_aops;
543 } else if (S_ISLNK(inode->i_mode)) {
544 inode->i_op = &page_symlink_inode_operations;
545 inode->i_mapping->a_ops = &hfsplus_aops;
546 } else {
547 init_special_inode(inode, inode->i_mode,
548 be32_to_cpu(file->permissions.dev));
549 }
550 inode->i_atime = hfsp_mt2ut(file->access_date);
551 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
552 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
553 HFSPLUS_I(inode)->create_date = file->create_date;
554 } else {
555 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
556 res = -EIO;
557 }
558 return res;
559}
560
561int hfsplus_cat_write_inode(struct inode *inode)
562{
563 struct inode *main_inode = inode;
564 struct hfs_find_data fd;
565 hfsplus_cat_entry entry;
566
567 if (HFSPLUS_IS_RSRC(inode))
568 main_inode = HFSPLUS_I(inode)->rsrc_inode;
569
570 if (!main_inode->i_nlink)
571 return 0;
572
573 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd))
574
575 return -EIO;
576
577 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
578
579 goto out;
580
581 if (S_ISDIR(main_inode->i_mode)) {
582 struct hfsplus_cat_folder *folder = &entry.folder;
583
584 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
585 ;
586 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
587 sizeof(struct hfsplus_cat_folder));
588
589 hfsplus_cat_set_perms(inode, &folder->permissions);
590 folder->access_date = hfsp_ut2mt(inode->i_atime);
591 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
592 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
593 folder->valence = cpu_to_be32(inode->i_size - 2);
594 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
595 sizeof(struct hfsplus_cat_folder));
596 } else if (HFSPLUS_IS_RSRC(inode)) {
597 struct hfsplus_cat_file *file = &entry.file;
598 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
599 sizeof(struct hfsplus_cat_file));
600 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
601 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
602 sizeof(struct hfsplus_cat_file));
603 } else {
604 struct hfsplus_cat_file *file = &entry.file;
605
606 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
607 ;
608 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
609 sizeof(struct hfsplus_cat_file));
610 hfsplus_inode_write_fork(inode, &file->data_fork);
611 hfsplus_cat_set_perms(inode, &file->permissions);
612 if (HFSPLUS_FLG_IMMUTABLE &
613 (file->permissions.rootflags |
614 file->permissions.userflags))
615 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
616 else
617 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
618 file->access_date = hfsp_ut2mt(inode->i_atime);
619 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
620 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
621 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
622 sizeof(struct hfsplus_cat_file));
623 }
624
625 set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags);
626out:
627 hfs_find_exit(&fd);
628 return 0;
629}
630
