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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 hip->userflags = 0;
197 set_bit(HFSPLUS_I_RSRC, &hip->flags);
198
199 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
200 if (!err) {
201 err = hfsplus_find_cat(sb, dir->i_ino, &fd);
202 if (!err)
203 err = hfsplus_cat_read_inode(inode, &fd);
204 hfs_find_exit(&fd);
205 }
206 if (err) {
207 iput(inode);
208 return ERR_PTR(err);
209 }
210 hip->rsrc_inode = dir;
211 HFSPLUS_I(dir)->rsrc_inode = inode;
212 igrab(dir);
213
214
215
216
217
218
219
220 hlist_add_fake(&inode->i_hash);
221
222 mark_inode_dirty(inode);
223out:
224 d_add(dentry, inode);
225 return NULL;
226}
227
228static void hfsplus_get_perms(struct inode *inode,
229 struct hfsplus_perm *perms, int dir)
230{
231 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
232 u16 mode;
233
234 mode = be16_to_cpu(perms->mode);
235
236 inode->i_uid = be32_to_cpu(perms->owner);
237 if (!inode->i_uid && !mode)
238 inode->i_uid = sbi->uid;
239
240 inode->i_gid = be32_to_cpu(perms->group);
241 if (!inode->i_gid && !mode)
242 inode->i_gid = sbi->gid;
243
244 if (dir) {
245 mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask));
246 mode |= S_IFDIR;
247 } else if (!mode)
248 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->umask));
249 inode->i_mode = mode;
250
251 HFSPLUS_I(inode)->userflags = perms->userflags;
252 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
253 inode->i_flags |= S_IMMUTABLE;
254 else
255 inode->i_flags &= ~S_IMMUTABLE;
256 if (perms->rootflags & HFSPLUS_FLG_APPEND)
257 inode->i_flags |= S_APPEND;
258 else
259 inode->i_flags &= ~S_APPEND;
260}
261
262static int hfsplus_file_open(struct inode *inode, struct file *file)
263{
264 if (HFSPLUS_IS_RSRC(inode))
265 inode = HFSPLUS_I(inode)->rsrc_inode;
266 if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
267 return -EOVERFLOW;
268 atomic_inc(&HFSPLUS_I(inode)->opencnt);
269 return 0;
270}
271
272static int hfsplus_file_release(struct inode *inode, struct file *file)
273{
274 struct super_block *sb = inode->i_sb;
275
276 if (HFSPLUS_IS_RSRC(inode))
277 inode = HFSPLUS_I(inode)->rsrc_inode;
278 if (atomic_dec_and_test(&HFSPLUS_I(inode)->opencnt)) {
279 mutex_lock(&inode->i_mutex);
280 hfsplus_file_truncate(inode);
281 if (inode->i_flags & S_DEAD) {
282 hfsplus_delete_cat(inode->i_ino,
283 HFSPLUS_SB(sb)->hidden_dir, NULL);
284 hfsplus_delete_inode(inode);
285 }
286 mutex_unlock(&inode->i_mutex);
287 }
288 return 0;
289}
290
291static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
292{
293 struct inode *inode = dentry->d_inode;
294 int error;
295
296 error = inode_change_ok(inode, attr);
297 if (error)
298 return error;
299
300 if ((attr->ia_valid & ATTR_SIZE) &&
301 attr->ia_size != i_size_read(inode)) {
302 inode_dio_wait(inode);
303
304 error = vmtruncate(inode, attr->ia_size);
305 if (error)
306 return error;
307 }
308
309 setattr_copy(inode, attr);
310 mark_inode_dirty(inode);
311 return 0;
312}
313
314int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
315 int datasync)
316{
317 struct inode *inode = file->f_mapping->host;
318 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
319 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
320 int error = 0, error2;
321
322 error = filemap_write_and_wait_range(inode->i_mapping, start, end);
323 if (error)
324 return error;
325 mutex_lock(&inode->i_mutex);
326
327
328
329
330 sync_inode_metadata(inode, 1);
331
332
333
334
335 if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags))
336 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
337
338 if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) {
339 error2 =
340 filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
341 if (!error)
342 error = error2;
343 }
344
345 if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) {
346 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
347 if (!error)
348 error = error2;
349 }
350
351 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
352 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
353
354 mutex_unlock(&inode->i_mutex);
355
356 return error;
357}
358
359static const struct inode_operations hfsplus_file_inode_operations = {
360 .lookup = hfsplus_file_lookup,
361 .truncate = hfsplus_file_truncate,
362 .setattr = hfsplus_setattr,
363 .setxattr = hfsplus_setxattr,
364 .getxattr = hfsplus_getxattr,
365 .listxattr = hfsplus_listxattr,
366};
367
368static const struct file_operations hfsplus_file_operations = {
369 .llseek = generic_file_llseek,
370 .read = do_sync_read,
371 .aio_read = generic_file_aio_read,
372 .write = do_sync_write,
373 .aio_write = generic_file_aio_write,
374 .mmap = generic_file_mmap,
375 .splice_read = generic_file_splice_read,
376 .fsync = hfsplus_file_fsync,
377 .open = hfsplus_file_open,
378 .release = hfsplus_file_release,
379 .unlocked_ioctl = hfsplus_ioctl,
380};
381
382struct inode *hfsplus_new_inode(struct super_block *sb, umode_t mode)
383{
384 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
385 struct inode *inode = new_inode(sb);
386 struct hfsplus_inode_info *hip;
387
388 if (!inode)
389 return NULL;
390
391 inode->i_ino = sbi->next_cnid++;
392 inode->i_mode = mode;
393 inode->i_uid = current_fsuid();
394 inode->i_gid = current_fsgid();
395 set_nlink(inode, 1);
396 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
397
398 hip = HFSPLUS_I(inode);
399 INIT_LIST_HEAD(&hip->open_dir_list);
400 mutex_init(&hip->extents_lock);
401 atomic_set(&hip->opencnt, 0);
402 hip->extent_state = 0;
403 hip->flags = 0;
404 hip->userflags = 0;
405 memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
406 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
407 hip->alloc_blocks = 0;
408 hip->first_blocks = 0;
409 hip->cached_start = 0;
410 hip->cached_blocks = 0;
411 hip->phys_size = 0;
412 hip->fs_blocks = 0;
413 hip->rsrc_inode = NULL;
414 if (S_ISDIR(inode->i_mode)) {
415 inode->i_size = 2;
416 sbi->folder_count++;
417 inode->i_op = &hfsplus_dir_inode_operations;
418 inode->i_fop = &hfsplus_dir_operations;
419 } else if (S_ISREG(inode->i_mode)) {
420 sbi->file_count++;
421 inode->i_op = &hfsplus_file_inode_operations;
422 inode->i_fop = &hfsplus_file_operations;
423 inode->i_mapping->a_ops = &hfsplus_aops;
424 hip->clump_blocks = sbi->data_clump_blocks;
425 } else if (S_ISLNK(inode->i_mode)) {
426 sbi->file_count++;
427 inode->i_op = &page_symlink_inode_operations;
428 inode->i_mapping->a_ops = &hfsplus_aops;
429 hip->clump_blocks = 1;
430 } else
431 sbi->file_count++;
432 insert_inode_hash(inode);
433 mark_inode_dirty(inode);
434 sb->s_dirt = 1;
435
436 return inode;
437}
438
439void hfsplus_delete_inode(struct inode *inode)
440{
441 struct super_block *sb = inode->i_sb;
442
443 if (S_ISDIR(inode->i_mode)) {
444 HFSPLUS_SB(sb)->folder_count--;
445 sb->s_dirt = 1;
446 return;
447 }
448 HFSPLUS_SB(sb)->file_count--;
449 if (S_ISREG(inode->i_mode)) {
450 if (!inode->i_nlink) {
451 inode->i_size = 0;
452 hfsplus_file_truncate(inode);
453 }
454 } else if (S_ISLNK(inode->i_mode)) {
455 inode->i_size = 0;
456 hfsplus_file_truncate(inode);
457 }
458 sb->s_dirt = 1;
459}
460
461void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
462{
463 struct super_block *sb = inode->i_sb;
464 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
465 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
466 u32 count;
467 int i;
468
469 memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec));
470 for (count = 0, i = 0; i < 8; i++)
471 count += be32_to_cpu(fork->extents[i].block_count);
472 hip->first_blocks = count;
473 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
474 hip->cached_start = 0;
475 hip->cached_blocks = 0;
476
477 hip->alloc_blocks = be32_to_cpu(fork->total_blocks);
478 hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size);
479 hip->fs_blocks =
480 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
481 inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
482 hip->clump_blocks =
483 be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift;
484 if (!hip->clump_blocks) {
485 hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ?
486 sbi->rsrc_clump_blocks :
487 sbi->data_clump_blocks;
488 }
489}
490
491void hfsplus_inode_write_fork(struct inode *inode,
492 struct hfsplus_fork_raw *fork)
493{
494 memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents,
495 sizeof(hfsplus_extent_rec));
496 fork->total_size = cpu_to_be64(inode->i_size);
497 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks);
498}
499
500int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
501{
502 hfsplus_cat_entry entry;
503 int res = 0;
504 u16 type;
505
506 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
507
508 HFSPLUS_I(inode)->linkid = 0;
509 if (type == HFSPLUS_FOLDER) {
510 struct hfsplus_cat_folder *folder = &entry.folder;
511
512 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
513 ;
514 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
515 sizeof(struct hfsplus_cat_folder));
516 hfsplus_get_perms(inode, &folder->permissions, 1);
517 set_nlink(inode, 1);
518 inode->i_size = 2 + be32_to_cpu(folder->valence);
519 inode->i_atime = hfsp_mt2ut(folder->access_date);
520 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
521 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
522 HFSPLUS_I(inode)->create_date = folder->create_date;
523 HFSPLUS_I(inode)->fs_blocks = 0;
524 inode->i_op = &hfsplus_dir_inode_operations;
525 inode->i_fop = &hfsplus_dir_operations;
526 } else if (type == HFSPLUS_FILE) {
527 struct hfsplus_cat_file *file = &entry.file;
528
529 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
530 ;
531 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
532 sizeof(struct hfsplus_cat_file));
533
534 hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ?
535 &file->rsrc_fork : &file->data_fork);
536 hfsplus_get_perms(inode, &file->permissions, 0);
537 set_nlink(inode, 1);
538 if (S_ISREG(inode->i_mode)) {
539 if (file->permissions.dev)
540 set_nlink(inode,
541 be32_to_cpu(file->permissions.dev));
542 inode->i_op = &hfsplus_file_inode_operations;
543 inode->i_fop = &hfsplus_file_operations;
544 inode->i_mapping->a_ops = &hfsplus_aops;
545 } else if (S_ISLNK(inode->i_mode)) {
546 inode->i_op = &page_symlink_inode_operations;
547 inode->i_mapping->a_ops = &hfsplus_aops;
548 } else {
549 init_special_inode(inode, inode->i_mode,
550 be32_to_cpu(file->permissions.dev));
551 }
552 inode->i_atime = hfsp_mt2ut(file->access_date);
553 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
554 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
555 HFSPLUS_I(inode)->create_date = file->create_date;
556 } else {
557 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
558 res = -EIO;
559 }
560 return res;
561}
562
563int hfsplus_cat_write_inode(struct inode *inode)
564{
565 struct inode *main_inode = inode;
566 struct hfs_find_data fd;
567 hfsplus_cat_entry entry;
568
569 if (HFSPLUS_IS_RSRC(inode))
570 main_inode = HFSPLUS_I(inode)->rsrc_inode;
571
572 if (!main_inode->i_nlink)
573 return 0;
574
575 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd))
576
577 return -EIO;
578
579 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
580
581 goto out;
582
583 if (S_ISDIR(main_inode->i_mode)) {
584 struct hfsplus_cat_folder *folder = &entry.folder;
585
586 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
587 ;
588 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
589 sizeof(struct hfsplus_cat_folder));
590
591 hfsplus_cat_set_perms(inode, &folder->permissions);
592 folder->access_date = hfsp_ut2mt(inode->i_atime);
593 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
594 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
595 folder->valence = cpu_to_be32(inode->i_size - 2);
596 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
597 sizeof(struct hfsplus_cat_folder));
598 } else if (HFSPLUS_IS_RSRC(inode)) {
599 struct hfsplus_cat_file *file = &entry.file;
600 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
601 sizeof(struct hfsplus_cat_file));
602 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
603 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
604 sizeof(struct hfsplus_cat_file));
605 } else {
606 struct hfsplus_cat_file *file = &entry.file;
607
608 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
609 ;
610 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
611 sizeof(struct hfsplus_cat_file));
612 hfsplus_inode_write_fork(inode, &file->data_fork);
613 hfsplus_cat_set_perms(inode, &file->permissions);
614 if (HFSPLUS_FLG_IMMUTABLE &
615 (file->permissions.rootflags |
616 file->permissions.userflags))
617 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
618 else
619 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
620 file->access_date = hfsp_ut2mt(inode->i_atime);
621 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
622 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
623 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
624 sizeof(struct hfsplus_cat_file));
625 }
626
627 set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags);
628out:
629 hfs_find_exit(&fd);
630 return 0;
631}
632
