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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)
69 return 0;
70 if (tree->node_size >= PAGE_CACHE_SIZE) {
71 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT);
72 spin_lock(&tree->hash_lock);
73 node = hfs_bnode_findhash(tree, nidx);
74 if (!node)
75 ;
76 else if (atomic_read(&node->refcnt))
77 res = 0;
78 if (res && node) {
79 hfs_bnode_unhash(node);
80 hfs_bnode_free(node);
81 }
82 spin_unlock(&tree->hash_lock);
83 } else {
84 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift);
85 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift);
86 spin_lock(&tree->hash_lock);
87 do {
88 node = hfs_bnode_findhash(tree, nidx++);
89 if (!node)
90 continue;
91 if (atomic_read(&node->refcnt)) {
92 res = 0;
93 break;
94 }
95 hfs_bnode_unhash(node);
96 hfs_bnode_free(node);
97 } while (--i && nidx < tree->node_count);
98 spin_unlock(&tree->hash_lock);
99 }
100 return res ? try_to_free_buffers(page) : 0;
101}
102
103static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb,
104 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
105{
106 struct file *file = iocb->ki_filp;
107 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host;
108
109 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
110 offset, nr_segs, hfsplus_get_block, NULL);
111}
112
113static int hfsplus_writepages(struct address_space *mapping,
114 struct writeback_control *wbc)
115{
116 return mpage_writepages(mapping, wbc, hfsplus_get_block);
117}
118
119const struct address_space_operations hfsplus_btree_aops = {
120 .readpage = hfsplus_readpage,
121 .writepage = hfsplus_writepage,
122 .sync_page = block_sync_page,
123 .write_begin = hfsplus_write_begin,
124 .write_end = generic_write_end,
125 .bmap = hfsplus_bmap,
126 .releasepage = hfsplus_releasepage,
127};
128
129const struct address_space_operations hfsplus_aops = {
130 .readpage = hfsplus_readpage,
131 .writepage = hfsplus_writepage,
132 .sync_page = block_sync_page,
133 .write_begin = hfsplus_write_begin,
134 .write_end = generic_write_end,
135 .bmap = hfsplus_bmap,
136 .direct_IO = hfsplus_direct_IO,
137 .writepages = hfsplus_writepages,
138};
139
140const struct dentry_operations hfsplus_dentry_operations = {
141 .d_hash = hfsplus_hash_dentry,
142 .d_compare = hfsplus_compare_dentry,
143};
144
145static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry,
146 struct nameidata *nd)
147{
148 struct hfs_find_data fd;
149 struct super_block *sb = dir->i_sb;
150 struct inode *inode = NULL;
151 int err;
152
153 if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc"))
154 goto out;
155
156 inode = HFSPLUS_I(dir).rsrc_inode;
157 if (inode)
158 goto out;
159
160 inode = new_inode(sb);
161 if (!inode)
162 return ERR_PTR(-ENOMEM);
163
164 inode->i_ino = dir->i_ino;
165 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
166 mutex_init(&HFSPLUS_I(inode).extents_lock);
167 HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC;
168
169 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
170 err = hfsplus_find_cat(sb, dir->i_ino, &fd);
171 if (!err)
172 err = hfsplus_cat_read_inode(inode, &fd);
173 hfs_find_exit(&fd);
174 if (err) {
175 iput(inode);
176 return ERR_PTR(err);
177 }
178 HFSPLUS_I(inode).rsrc_inode = dir;
179 HFSPLUS_I(dir).rsrc_inode = inode;
180 igrab(dir);
181 hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes);
182 mark_inode_dirty(inode);
183out:
184 d_add(dentry, inode);
185 return NULL;
186}
187
188static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir)
189{
190 struct super_block *sb = inode->i_sb;
191 u16 mode;
192
193 mode = be16_to_cpu(perms->mode);
194
195 inode->i_uid = be32_to_cpu(perms->owner);
196 if (!inode->i_uid && !mode)
197 inode->i_uid = HFSPLUS_SB(sb).uid;
198
199 inode->i_gid = be32_to_cpu(perms->group);
200 if (!inode->i_gid && !mode)
201 inode->i_gid = HFSPLUS_SB(sb).gid;
202
203 if (dir) {
204 mode = mode ? (mode & S_IALLUGO) :
205 (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask));
206 mode |= S_IFDIR;
207 } else if (!mode)
208 mode = S_IFREG | ((S_IRUGO|S_IWUGO) &
209 ~(HFSPLUS_SB(sb).umask));
210 inode->i_mode = mode;
211
212 HFSPLUS_I(inode).rootflags = perms->rootflags;
213 HFSPLUS_I(inode).userflags = perms->userflags;
214 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE)
215 inode->i_flags |= S_IMMUTABLE;
216 else
217 inode->i_flags &= ~S_IMMUTABLE;
218 if (perms->rootflags & HFSPLUS_FLG_APPEND)
219 inode->i_flags |= S_APPEND;
220 else
221 inode->i_flags &= ~S_APPEND;
222}
223
224static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms)
225{
226 if (inode->i_flags & S_IMMUTABLE)
227 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
228 else
229 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
230 if (inode->i_flags & S_APPEND)
231 perms->rootflags |= HFSPLUS_FLG_APPEND;
232 else
233 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
234 perms->userflags = HFSPLUS_I(inode).userflags;
235 perms->mode = cpu_to_be16(inode->i_mode);
236 perms->owner = cpu_to_be32(inode->i_uid);
237 perms->group = cpu_to_be32(inode->i_gid);
238 perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev);
239}
240
241static int hfsplus_file_open(struct inode *inode, struct file *file)
242{
243 if (HFSPLUS_IS_RSRC(inode))
244 inode = HFSPLUS_I(inode).rsrc_inode;
245 if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
246 return -EOVERFLOW;
247 atomic_inc(&HFSPLUS_I(inode).opencnt);
248 return 0;
249}
250
251static int hfsplus_file_release(struct inode *inode, struct file *file)
252{
253 struct super_block *sb = inode->i_sb;
254
255 if (HFSPLUS_IS_RSRC(inode))
256 inode = HFSPLUS_I(inode).rsrc_inode;
257 if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
258 mutex_lock(&inode->i_mutex);
259 hfsplus_file_truncate(inode);
260 if (inode->i_flags & S_DEAD) {
261 hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
262 hfsplus_delete_inode(inode);
263 }
264 mutex_unlock(&inode->i_mutex);
265 }
266 return 0;
267}
268
269static const struct inode_operations hfsplus_file_inode_operations = {
270 .lookup = hfsplus_file_lookup,
271 .truncate = hfsplus_file_truncate,
272 .setxattr = hfsplus_setxattr,
273 .getxattr = hfsplus_getxattr,
274 .listxattr = hfsplus_listxattr,
275};
276
277static const struct file_operations hfsplus_file_operations = {
278 .llseek = generic_file_llseek,
279 .read = do_sync_read,
280 .aio_read = generic_file_aio_read,
281 .write = do_sync_write,
282 .aio_write = generic_file_aio_write,
283 .mmap = generic_file_mmap,
284 .splice_read = generic_file_splice_read,
285 .fsync = file_fsync,
286 .open = hfsplus_file_open,
287 .release = hfsplus_file_release,
288 .ioctl = hfsplus_ioctl,
289};
290
291struct inode *hfsplus_new_inode(struct super_block *sb, int mode)
292{
293 struct inode *inode = new_inode(sb);
294 if (!inode)
295 return NULL;
296
297 inode->i_ino = HFSPLUS_SB(sb).next_cnid++;
298 inode->i_mode = mode;
299 inode->i_uid = current_fsuid();
300 inode->i_gid = current_fsgid();
301 inode->i_nlink = 1;
302 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
303 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list);
304 mutex_init(&HFSPLUS_I(inode).extents_lock);
305 atomic_set(&HFSPLUS_I(inode).opencnt, 0);
306 HFSPLUS_I(inode).flags = 0;
307 memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec));
308 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
309 HFSPLUS_I(inode).alloc_blocks = 0;
310 HFSPLUS_I(inode).first_blocks = 0;
311 HFSPLUS_I(inode).cached_start = 0;
312 HFSPLUS_I(inode).cached_blocks = 0;
313 HFSPLUS_I(inode).phys_size = 0;
314 HFSPLUS_I(inode).fs_blocks = 0;
315 HFSPLUS_I(inode).rsrc_inode = NULL;
316 if (S_ISDIR(inode->i_mode)) {
317 inode->i_size = 2;
318 HFSPLUS_SB(sb).folder_count++;
319 inode->i_op = &hfsplus_dir_inode_operations;
320 inode->i_fop = &hfsplus_dir_operations;
321 } else if (S_ISREG(inode->i_mode)) {
322 HFSPLUS_SB(sb).file_count++;
323 inode->i_op = &hfsplus_file_inode_operations;
324 inode->i_fop = &hfsplus_file_operations;
325 inode->i_mapping->a_ops = &hfsplus_aops;
326 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks;
327 } else if (S_ISLNK(inode->i_mode)) {
328 HFSPLUS_SB(sb).file_count++;
329 inode->i_op = &page_symlink_inode_operations;
330 inode->i_mapping->a_ops = &hfsplus_aops;
331 HFSPLUS_I(inode).clump_blocks = 1;
332 } else
333 HFSPLUS_SB(sb).file_count++;
334 insert_inode_hash(inode);
335 mark_inode_dirty(inode);
336 sb->s_dirt = 1;
337
338 return inode;
339}
340
341void hfsplus_delete_inode(struct inode *inode)
342{
343 struct super_block *sb = inode->i_sb;
344
345 if (S_ISDIR(inode->i_mode)) {
346 HFSPLUS_SB(sb).folder_count--;
347 sb->s_dirt = 1;
348 return;
349 }
350 HFSPLUS_SB(sb).file_count--;
351 if (S_ISREG(inode->i_mode)) {
352 if (!inode->i_nlink) {
353 inode->i_size = 0;
354 hfsplus_file_truncate(inode);
355 }
356 } else if (S_ISLNK(inode->i_mode)) {
357 inode->i_size = 0;
358 hfsplus_file_truncate(inode);
359 }
360 sb->s_dirt = 1;
361}
362
363void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
364{
365 struct super_block *sb = inode->i_sb;
366 u32 count;
367 int i;
368
369 memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents,
370 sizeof(hfsplus_extent_rec));
371 for (count = 0, i = 0; i < 8; i++)
372 count += be32_to_cpu(fork->extents[i].block_count);
373 HFSPLUS_I(inode).first_blocks = count;
374 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec));
375 HFSPLUS_I(inode).cached_start = 0;
376 HFSPLUS_I(inode).cached_blocks = 0;
377
378 HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks);
379 inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size);
380 HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits;
381 inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits);
382 HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift;
383 if (!HFSPLUS_I(inode).clump_blocks)
384 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks :
385 HFSPLUS_SB(sb).data_clump_blocks;
386}
387
388void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork)
389{
390 memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents,
391 sizeof(hfsplus_extent_rec));
392 fork->total_size = cpu_to_be64(inode->i_size);
393 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks);
394}
395
396int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd)
397{
398 hfsplus_cat_entry entry;
399 int res = 0;
400 u16 type;
401
402 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset);
403
404 HFSPLUS_I(inode).dev = 0;
405 if (type == HFSPLUS_FOLDER) {
406 struct hfsplus_cat_folder *folder = &entry.folder;
407
408 if (fd->entrylength < sizeof(struct hfsplus_cat_folder))
409 ;
410 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
411 sizeof(struct hfsplus_cat_folder));
412 hfsplus_get_perms(inode, &folder->permissions, 1);
413 inode->i_nlink = 1;
414 inode->i_size = 2 + be32_to_cpu(folder->valence);
415 inode->i_atime = hfsp_mt2ut(folder->access_date);
416 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date);
417 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date);
418 HFSPLUS_I(inode).create_date = folder->create_date;
419 HFSPLUS_I(inode).fs_blocks = 0;
420 inode->i_op = &hfsplus_dir_inode_operations;
421 inode->i_fop = &hfsplus_dir_operations;
422 } else if (type == HFSPLUS_FILE) {
423 struct hfsplus_cat_file *file = &entry.file;
424
425 if (fd->entrylength < sizeof(struct hfsplus_cat_file))
426 ;
427 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset,
428 sizeof(struct hfsplus_cat_file));
429
430 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ?
431 &file->data_fork : &file->rsrc_fork);
432 hfsplus_get_perms(inode, &file->permissions, 0);
433 inode->i_nlink = 1;
434 if (S_ISREG(inode->i_mode)) {
435 if (file->permissions.dev)
436 inode->i_nlink = be32_to_cpu(file->permissions.dev);
437 inode->i_op = &hfsplus_file_inode_operations;
438 inode->i_fop = &hfsplus_file_operations;
439 inode->i_mapping->a_ops = &hfsplus_aops;
440 } else if (S_ISLNK(inode->i_mode)) {
441 inode->i_op = &page_symlink_inode_operations;
442 inode->i_mapping->a_ops = &hfsplus_aops;
443 } else {
444 init_special_inode(inode, inode->i_mode,
445 be32_to_cpu(file->permissions.dev));
446 }
447 inode->i_atime = hfsp_mt2ut(file->access_date);
448 inode->i_mtime = hfsp_mt2ut(file->content_mod_date);
449 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date);
450 HFSPLUS_I(inode).create_date = file->create_date;
451 } else {
452 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n");
453 res = -EIO;
454 }
455 return res;
456}
457
458int hfsplus_cat_write_inode(struct inode *inode)
459{
460 struct inode *main_inode = inode;
461 struct hfs_find_data fd;
462 hfsplus_cat_entry entry;
463
464 if (HFSPLUS_IS_RSRC(inode))
465 main_inode = HFSPLUS_I(inode).rsrc_inode;
466
467 if (!main_inode->i_nlink)
468 return 0;
469
470 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd))
471
472 return -EIO;
473
474 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd))
475
476 goto out;
477
478 if (S_ISDIR(main_inode->i_mode)) {
479 struct hfsplus_cat_folder *folder = &entry.folder;
480
481 if (fd.entrylength < sizeof(struct hfsplus_cat_folder))
482 ;
483 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
484 sizeof(struct hfsplus_cat_folder));
485
486 hfsplus_set_perms(inode, &folder->permissions);
487 folder->access_date = hfsp_ut2mt(inode->i_atime);
488 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime);
489 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
490 folder->valence = cpu_to_be32(inode->i_size - 2);
491 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
492 sizeof(struct hfsplus_cat_folder));
493 } else if (HFSPLUS_IS_RSRC(inode)) {
494 struct hfsplus_cat_file *file = &entry.file;
495 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
496 sizeof(struct hfsplus_cat_file));
497 hfsplus_inode_write_fork(inode, &file->rsrc_fork);
498 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
499 sizeof(struct hfsplus_cat_file));
500 } else {
501 struct hfsplus_cat_file *file = &entry.file;
502
503 if (fd.entrylength < sizeof(struct hfsplus_cat_file))
504 ;
505 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
506 sizeof(struct hfsplus_cat_file));
507 hfsplus_inode_write_fork(inode, &file->data_fork);
508 if (S_ISREG(inode->i_mode))
509 HFSPLUS_I(inode).dev = inode->i_nlink;
510 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode))
511 HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev);
512 hfsplus_set_perms(inode, &file->permissions);
513 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
514 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
515 else
516 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED);
517 file->access_date = hfsp_ut2mt(inode->i_atime);
518 file->content_mod_date = hfsp_ut2mt(inode->i_mtime);
519 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime);
520 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset,
521 sizeof(struct hfsplus_cat_file));
522 }
523out:
524 hfs_find_exit(&fd);
525 return 0;
526}
527
