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xtensa: fix high memory/reserved memory collision
[cris-mirror.git] / fs / hfsplus / inode.c
blobc0c8d433864f15cc97ee9aead06298dab27443b5
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/hfsplus/inode.c
4 *
5 * Copyright (C) 2001
6 * Brad Boyer (flar@allandria.com)
7 * (C) 2003 Ardis Technologies <roman@ardistech.com>
8 *
9 * Inode handling routines
10 */
11
12 #include <linux/blkdev.h>
13 #include <linux/mm.h>
14 #include <linux/fs.h>
15 #include <linux/pagemap.h>
16 #include <linux/mpage.h>
17 #include <linux/sched.h>
18 #include <linux/cred.h>
19 #include <linux/uio.h>
20
21 #include "hfsplus_fs.h"
22 #include "hfsplus_raw.h"
23 #include "xattr.h"
24 #include "acl.h"
25
26 static int hfsplus_readpage(struct file *file, struct page *page)
27 {
28 return block_read_full_page(page, hfsplus_get_block);
29 }
30
31 static int hfsplus_writepage(struct page *page, struct writeback_control *wbc)
32 {
33 return block_write_full_page(page, hfsplus_get_block, wbc);
34 }
35
36 static void hfsplus_write_failed(struct address_space *mapping, loff_t to)
37 {
38 struct inode *inode = mapping->host;
39
40 if (to > inode->i_size) {
41 truncate_pagecache(inode, inode->i_size);
42 hfsplus_file_truncate(inode);
43 }
44 }
45
46 static int hfsplus_write_begin(struct file *file, struct address_space *mapping,
47 loff_t pos, unsigned len, unsigned flags,
48 struct page **pagep, void **fsdata)
49 {
50 int ret;
51
52 *pagep = NULL;
53 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
54 hfsplus_get_block,
55 &HFSPLUS_I(mapping->host)->phys_size);
56 if (unlikely(ret))
57 hfsplus_write_failed(mapping, pos + len);
58
59 return ret;
60 }
61
62 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block)
63 {
64 return generic_block_bmap(mapping, block, hfsplus_get_block);
65 }
66
67 static int hfsplus_releasepage(struct page *page, gfp_t mask)
68 {
69 struct inode *inode = page->mapping->host;
70 struct super_block *sb = inode->i_sb;
71 struct hfs_btree *tree;
72 struct hfs_bnode *node;
73 u32 nidx;
74 int i, res = 1;
75
76 switch (inode->i_ino) {
77 case HFSPLUS_EXT_CNID:
78 tree = HFSPLUS_SB(sb)->ext_tree;
79 break;
80 case HFSPLUS_CAT_CNID:
81 tree = HFSPLUS_SB(sb)->cat_tree;
82 break;
83 case HFSPLUS_ATTR_CNID:
84 tree = HFSPLUS_SB(sb)->attr_tree;
85 break;
86 default:
87 BUG();
88 return 0;
89 }
90 if (!tree)
91 return 0;
92 if (tree->node_size >= PAGE_SIZE) {
93 nidx = page->index >>
94 (tree->node_size_shift - PAGE_SHIFT);
95 spin_lock(&tree->hash_lock);
96 node = hfs_bnode_findhash(tree, nidx);
97 if (!node)
98 ;
99 else if (atomic_read(&node->refcnt))
100 res = 0;
101 if (res && node) {
102 hfs_bnode_unhash(node);
103 hfs_bnode_free(node);
104 }
105 spin_unlock(&tree->hash_lock);
106 } else {
107 nidx = page->index <<
108 (PAGE_SHIFT - tree->node_size_shift);
109 i = 1 << (PAGE_SHIFT - tree->node_size_shift);
110 spin_lock(&tree->hash_lock);
111 do {
112 node = hfs_bnode_findhash(tree, nidx++);
113 if (!node)
114 continue;
115 if (atomic_read(&node->refcnt)) {
116 res = 0;
117 break;
118 }
119 hfs_bnode_unhash(node);
120 hfs_bnode_free(node);
121 } while (--i && nidx < tree->node_count);
122 spin_unlock(&tree->hash_lock);
123 }
124 return res ? try_to_free_buffers(page) : 0;
125 }
126
127 static ssize_t hfsplus_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
128 {
129 struct file *file = iocb->ki_filp;
130 struct address_space *mapping = file->f_mapping;
131 struct inode *inode = mapping->host;
132 size_t count = iov_iter_count(iter);
133 ssize_t ret;
134
135 ret = blockdev_direct_IO(iocb, inode, iter, hfsplus_get_block);
136
137 /*
138 * In case of error extending write may have instantiated a few
139 * blocks outside i_size. Trim these off again.
140 */
141 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
142 loff_t isize = i_size_read(inode);
143 loff_t end = iocb->ki_pos + count;
144
145 if (end > isize)
146 hfsplus_write_failed(mapping, end);
147 }
148
149 return ret;
150 }
151
152 static int hfsplus_writepages(struct address_space *mapping,
153 struct writeback_control *wbc)
154 {
155 return mpage_writepages(mapping, wbc, hfsplus_get_block);
156 }
157
158 const struct address_space_operations hfsplus_btree_aops = {
159 .readpage = hfsplus_readpage,
160 .writepage = hfsplus_writepage,
161 .write_begin = hfsplus_write_begin,
162 .write_end = generic_write_end,
163 .bmap = hfsplus_bmap,
164 .releasepage = hfsplus_releasepage,
165 };
166
167 const struct address_space_operations hfsplus_aops = {
168 .readpage = hfsplus_readpage,
169 .writepage = hfsplus_writepage,
170 .write_begin = hfsplus_write_begin,
171 .write_end = generic_write_end,
172 .bmap = hfsplus_bmap,
173 .direct_IO = hfsplus_direct_IO,
174 .writepages = hfsplus_writepages,
175 };
176
177 const struct dentry_operations hfsplus_dentry_operations = {
178 .d_hash = hfsplus_hash_dentry,
179 .d_compare = hfsplus_compare_dentry,
180 };
181
182 static void hfsplus_get_perms(struct inode *inode,
183 struct hfsplus_perm *perms, int dir)
184 {
185 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
186 u16 mode;
187
188 mode = be16_to_cpu(perms->mode);
189
190 i_uid_write(inode, be32_to_cpu(perms->owner));
191 if (!i_uid_read(inode) && !mode)
192 inode->i_uid = sbi->uid;
193
194 i_gid_write(inode, be32_to_cpu(perms->group));
195 if (!i_gid_read(inode) && !mode)
196 inode->i_gid = sbi->gid;
197
198 if (dir) {
199 mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask));
200 mode |= S_IFDIR;
201 } else if (!mode)
202 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->umask));
203 inode->i_mode = mode;
204
205 HFSPLUS_I(inode)->userflags = perms->userflags;
206 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
207 inode->i_flags |= S_IMMUTABLE;
208 else
209 inode->i_flags &= ~S_IMMUTABLE;
210 if (perms->rootflags & HFSPLUS_FLG_APPEND)
211 inode->i_flags |= S_APPEND;
212 else
213 inode->i_flags &= ~S_APPEND;
214 }
215
216 static int hfsplus_file_open(struct inode *inode, struct file *file)
217 {
218 if (HFSPLUS_IS_RSRC(inode))
219 inode = HFSPLUS_I(inode)->rsrc_inode;
220 if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
221 return -EOVERFLOW;
222 atomic_inc(&HFSPLUS_I(inode)->opencnt);
223 return 0;
224 }
225
226 static int hfsplus_file_release(struct inode *inode, struct file *file)
227 {
228 struct super_block *sb = inode->i_sb;
229
230 if (HFSPLUS_IS_RSRC(inode))
231 inode = HFSPLUS_I(inode)->rsrc_inode;
232 if (atomic_dec_and_test(&HFSPLUS_I(inode)->opencnt)) {
233 inode_lock(inode);
234 hfsplus_file_truncate(inode);
235 if (inode->i_flags & S_DEAD) {
236 hfsplus_delete_cat(inode->i_ino,
237 HFSPLUS_SB(sb)->hidden_dir, NULL);
238 hfsplus_delete_inode(inode);
239 }
240 inode_unlock(inode);
241 }
242 return 0;
243 }
244
245 static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr)
246 {
247 struct inode *inode = d_inode(dentry);
248 int error;
249
250 error = setattr_prepare(dentry, attr);
251 if (error)
252 return error;
253
254 if ((attr->ia_valid & ATTR_SIZE) &&
255 attr->ia_size != i_size_read(inode)) {
256 inode_dio_wait(inode);
257 if (attr->ia_size > inode->i_size) {
258 error = generic_cont_expand_simple(inode,
259 attr->ia_size);
260 if (error)
261 return error;
262 }
263 truncate_setsize(inode, attr->ia_size);
264 hfsplus_file_truncate(inode);
265 }
266
267 setattr_copy(inode, attr);
268 mark_inode_dirty(inode);
269
270 if (attr->ia_valid & ATTR_MODE) {
271 error = posix_acl_chmod(inode, inode->i_mode);
272 if (unlikely(error))
273 return error;
274 }
275
276 return 0;
277 }
278
279 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
280 int datasync)
281 {
282 struct inode *inode = file->f_mapping->host;
283 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
284 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
285 int error = 0, error2;
286
287 error = file_write_and_wait_range(file, start, end);
288 if (error)
289 return error;
290 inode_lock(inode);
291
292 /*
293 * Sync inode metadata into the catalog and extent trees.
294 */
295 sync_inode_metadata(inode, 1);
296
297 /*
298 * And explicitly write out the btrees.
299 */
300 if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags))
301 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
302
303 if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) {
304 error2 =
305 filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
306 if (!error)
307 error = error2;
308 }
309
310 if (test_and_clear_bit(HFSPLUS_I_ATTR_DIRTY, &hip->flags)) {
311 if (sbi->attr_tree) {
312 error2 =
313 filemap_write_and_wait(
314 sbi->attr_tree->inode->i_mapping);
315 if (!error)
316 error = error2;
317 } else {
318 pr_err("sync non-existent attributes tree\n");
319 }
320 }
321
322 if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) {
323 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
324 if (!error)
325 error = error2;
326 }
327
328 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
329 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
330
331 inode_unlock(inode);
332
333 return error;
334 }
335
336 static const struct inode_operations hfsplus_file_inode_operations = {
337 .setattr = hfsplus_setattr,
338 .listxattr = hfsplus_listxattr,
339 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
340 .get_acl = hfsplus_get_posix_acl,
341 .set_acl = hfsplus_set_posix_acl,
342 #endif
343 };
344
345 static const struct file_operations hfsplus_file_operations = {
346 .llseek = generic_file_llseek,
347 .read_iter = generic_file_read_iter,
348 .write_iter = generic_file_write_iter,
349 .mmap = generic_file_mmap,
350 .splice_read = generic_file_splice_read,
351 .fsync = hfsplus_file_fsync,
352 .open = hfsplus_file_open,
353 .release = hfsplus_file_release,
354 .unlocked_ioctl = hfsplus_ioctl,
355 };
356
357 struct inode *hfsplus_new_inode(struct super_block *sb, struct inode *dir,
358 umode_t mode)
359 {
360 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
361 struct inode *inode = new_inode(sb);
362 struct hfsplus_inode_info *hip;
363
364 if (!inode)
365 return NULL;
366
367 inode->i_ino = sbi->next_cnid++;
368 inode_init_owner(inode, dir, mode);
369 set_nlink(inode, 1);
370 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
371
372 hip = HFSPLUS_I(inode);
373 INIT_LIST_HEAD(&hip->open_dir_list);
374 spin_lock_init(&hip->open_dir_lock);
375 mutex_init(&hip->extents_lock);
376 atomic_set(&hip->opencnt, 0);
377 hip->extent_state = 0;
378 hip->flags = 0;
379 hip->userflags = 0;
380 hip->subfolders = 0;
381 memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec));
382 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
383 hip->alloc_blocks = 0;
384 hip->first_blocks = 0;
385 hip->cached_start = 0;
386 hip->cached_blocks = 0;
387 hip->phys_size = 0;
388 hip->fs_blocks = 0;
389 hip->rsrc_inode = NULL;
390 if (S_ISDIR(inode->i_mode)) {
391 inode->i_size = 2;
392 sbi->folder_count++;
393 inode->i_op = &hfsplus_dir_inode_operations;
394 inode->i_fop = &hfsplus_dir_operations;
395 } else if (S_ISREG(inode->i_mode)) {
396 sbi->file_count++;
397 inode->i_op = &hfsplus_file_inode_operations;
398 inode->i_fop = &hfsplus_file_operations;
399 inode->i_mapping->a_ops = &hfsplus_aops;
400 hip->clump_blocks = sbi->data_clump_blocks;
401 } else if (S_ISLNK(inode->i_mode)) {
402 sbi->file_count++;
403 inode->i_op = &page_symlink_inode_operations;
404 inode_nohighmem(inode);
405 inode->i_mapping->a_ops = &hfsplus_aops;
406 hip->clump_blocks = 1;
407 } else
408 sbi->file_count++;
409 insert_inode_hash(inode);
410 mark_inode_dirty(inode);
411 hfsplus_mark_mdb_dirty(sb);
412
413 return inode;
414 }
415
416 void hfsplus_delete_inode(struct inode *inode)
417 {
418 struct super_block *sb = inode->i_sb;
419
420 if (S_ISDIR(inode->i_mode)) {
421 HFSPLUS_SB(sb)->folder_count--;
422 hfsplus_mark_mdb_dirty(sb);
423 return;
424 }
425 HFSPLUS_SB(sb)->file_count--;
426 if (S_ISREG(inode->i_mode)) {
427 if (!inode->i_nlink) {
428 inode->i_size = 0;
429 hfsplus_file_truncate(inode);
430 }
431 } else if (S_ISLNK(inode->i_mode)) {
432 inode->i_size = 0;
433 hfsplus_file_truncate(inode);
434 }
435 hfsplus_mark_mdb_dirty(sb);
436 }
437
438 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
439 {
440 struct super_block *sb = inode->i_sb;
441 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
442 struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
443 u32 count;
444 int i;
445
446 memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec));
447 for (count = 0, i = 0; i < 8; i++)
448 count += be32_to_cpu(fork->extents[i].block_count);
449 hip->first_blocks = count;
450 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec));
451 hip->cached_start = 0;
452 hip->cached_blocks = 0;
453
454 hip->alloc_blocks = be32_to_cpu(fork->total_blocks);
455 hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size);
456 hip->fs_blocks =
457 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
458 inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits);
459 hip->clump_blocks =
460 be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift;
461 if (!hip->clump_blocks) {
462 hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ?
463 sbi->rsrc_clump_blocks :
464 sbi->data_clump_blocks;
465 }
466 }
467
468 void hfsplus_inode_write_fork(struct inode *inode,
469 struct hfsplus_fork_raw *fork)
470 {
471 memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents,
472 sizeof(hfsplus_extent_rec));
473 fork->total_size = cpu_to_be64(inode->i_size);
474 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks);
475 }
476
477 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
478 {
479 hfsplus_cat_entry entry;
480 int res = 0;
481 u16 type;
482
483 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
484
485 HFSPLUS_I(inode)->linkid = 0;
486 if (type == HFSPLUS_FOLDER) {
487 struct hfsplus_cat_folder *folder = &entry.folder;
488
489 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
490 /* panic? */;
491 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
492 sizeof(struct hfsplus_cat_folder));
493 hfsplus_get_perms(inode, &folder->permissions, 1);
494 set_nlink(inode, 1);
495 inode->i_size = 2 + be32_to_cpu(folder->valence);
496 inode->i_atime = hfsp_mt2ut(folder->access_date);
497 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
498 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
499 HFSPLUS_I(inode)->create_date = folder->create_date;
500 HFSPLUS_I(inode)->fs_blocks = 0;
501 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) {
502 HFSPLUS_I(inode)->subfolders =
503 be32_to_cpu(folder->subfolders);
504 }
505 inode->i_op = &hfsplus_dir_inode_operations;
506 inode->i_fop = &hfsplus_dir_operations;
507 } else if (type == HFSPLUS_FILE) {
508 struct hfsplus_cat_file *file = &entry.file;
509
510 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
511 /* panic? */;
512 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
513 sizeof(struct hfsplus_cat_file));
514
515 hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ?
516 &file->rsrc_fork : &file->data_fork);
517 hfsplus_get_perms(inode, &file->permissions, 0);
518 set_nlink(inode, 1);
519 if (S_ISREG(inode->i_mode)) {
520 if (file->permissions.dev)
521 set_nlink(inode,
522 be32_to_cpu(file->permissions.dev));
523 inode->i_op = &hfsplus_file_inode_operations;
524 inode->i_fop = &hfsplus_file_operations;
525 inode->i_mapping->a_ops = &hfsplus_aops;
526 } else if (S_ISLNK(inode->i_mode)) {
527 inode->i_op = &page_symlink_inode_operations;
528 inode_nohighmem(inode);
529 inode->i_mapping->a_ops = &hfsplus_aops;
530 } else {
531 init_special_inode(inode, inode->i_mode,
532 be32_to_cpu(file->permissions.dev));
533 }
534 inode->i_atime = hfsp_mt2ut(file->access_date);
535 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
536 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
537 HFSPLUS_I(inode)->create_date = file->create_date;
538 } else {
539 pr_err("bad catalog entry used to create inode\n");
540 res = -EIO;
541 }
542 return res;
543 }
544
545 int hfsplus_cat_write_inode(struct inode *inode)
546 {
547 struct inode *main_inode = inode;
548 struct hfs_find_data fd;
549 hfsplus_cat_entry entry;
550
551 if (HFSPLUS_IS_RSRC(inode))
552 main_inode = HFSPLUS_I(inode)->rsrc_inode;
553
554 if (!main_inode->i_nlink)
555 return 0;
556
557 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd))
558 /* panic? */
559 return -EIO;
560
561 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
562 /* panic? */
563 goto out;
564
565 if (S_ISDIR(main_inode->i_mode)) {
566 struct hfsplus_cat_folder *folder = &entry.folder;
567
568 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
569 /* panic? */;
570 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
571 sizeof(struct hfsplus_cat_folder));
572 /* simple node checks? */
573 hfsplus_cat_set_perms(inode, &folder->permissions);
574 folder->access_date = hfsp_ut2mt(inode->i_atime);
575 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
576 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
577 folder->valence = cpu_to_be32(inode->i_size - 2);
578 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) {
579 folder->subfolders =
580 cpu_to_be32(HFSPLUS_I(inode)->subfolders);
581 }
582 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
583 sizeof(struct hfsplus_cat_folder));
584 } else if (HFSPLUS_IS_RSRC(inode)) {
585 struct hfsplus_cat_file *file = &entry.file;
586 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
587 sizeof(struct hfsplus_cat_file));
588 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
589 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
590 sizeof(struct hfsplus_cat_file));
591 } else {
592 struct hfsplus_cat_file *file = &entry.file;
593
594 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
595 /* panic? */;
596 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
597 sizeof(struct hfsplus_cat_file));
598 hfsplus_inode_write_fork(inode, &file->data_fork);
599 hfsplus_cat_set_perms(inode, &file->permissions);
600 if (HFSPLUS_FLG_IMMUTABLE &
601 (file->permissions.rootflags |
602 file->permissions.userflags))
603 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
604 else
605 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
606 file->access_date = hfsp_ut2mt(inode->i_atime);
607 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
608 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
609 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
610 sizeof(struct hfsplus_cat_file));
611 }
612
613 set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags);
614 out:
615 hfs_find_exit(&fd);
616 return 0;
617 }
CRIS linux kernel tree