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