Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / fs / hfsplus / dir.c
blobbdec66522de3436ea270b92e4ce1c31938a2fa5c
1 /*
2 * linux/fs/hfsplus/dir.c
4 * Copyright (C) 2001
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
8 * Handling of directories
9 */
11 #include <linux/errno.h>
12 #include <linux/fs.h>
13 #include <linux/slab.h>
14 #include <linux/random.h>
16 #include "hfsplus_fs.h"
17 #include "hfsplus_raw.h"
18 #include "xattr.h"
19 #include "acl.h"
21 static inline void hfsplus_instantiate(struct dentry *dentry,
22 struct inode *inode, u32 cnid)
24 dentry->d_fsdata = (void *)(unsigned long)cnid;
25 d_instantiate(dentry, inode);
28 /* Find the entry inside dir named dentry->d_name */
29 static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
30 unsigned int flags)
32 struct inode *inode = NULL;
33 struct hfs_find_data fd;
34 struct super_block *sb;
35 hfsplus_cat_entry entry;
36 int err;
37 u32 cnid, linkid = 0;
38 u16 type;
40 sb = dir->i_sb;
42 dentry->d_fsdata = NULL;
43 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
44 if (err)
45 return ERR_PTR(err);
46 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
47 again:
48 err = hfs_brec_read(&fd, &entry, sizeof(entry));
49 if (err) {
50 if (err == -ENOENT) {
51 hfs_find_exit(&fd);
52 /* No such entry */
53 inode = NULL;
54 goto out;
56 goto fail;
58 type = be16_to_cpu(entry.type);
59 if (type == HFSPLUS_FOLDER) {
60 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
61 err = -EIO;
62 goto fail;
64 cnid = be32_to_cpu(entry.folder.id);
65 dentry->d_fsdata = (void *)(unsigned long)cnid;
66 } else if (type == HFSPLUS_FILE) {
67 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
68 err = -EIO;
69 goto fail;
71 cnid = be32_to_cpu(entry.file.id);
72 if (entry.file.user_info.fdType ==
73 cpu_to_be32(HFSP_HARDLINK_TYPE) &&
74 entry.file.user_info.fdCreator ==
75 cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
76 (entry.file.create_date ==
77 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
78 create_date ||
79 entry.file.create_date ==
80 HFSPLUS_I(sb->s_root->d_inode)->
81 create_date) &&
82 HFSPLUS_SB(sb)->hidden_dir) {
83 struct qstr str;
84 char name[32];
86 if (dentry->d_fsdata) {
88 * We found a link pointing to another link,
89 * so ignore it and treat it as regular file.
91 cnid = (unsigned long)dentry->d_fsdata;
92 linkid = 0;
93 } else {
94 dentry->d_fsdata = (void *)(unsigned long)cnid;
95 linkid =
96 be32_to_cpu(entry.file.permissions.dev);
97 str.len = sprintf(name, "iNode%d", linkid);
98 str.name = name;
99 hfsplus_cat_build_key(sb, fd.search_key,
100 HFSPLUS_SB(sb)->hidden_dir->i_ino,
101 &str);
102 goto again;
104 } else if (!dentry->d_fsdata)
105 dentry->d_fsdata = (void *)(unsigned long)cnid;
106 } else {
107 pr_err("invalid catalog entry type in lookup\n");
108 err = -EIO;
109 goto fail;
111 hfs_find_exit(&fd);
112 inode = hfsplus_iget(dir->i_sb, cnid);
113 if (IS_ERR(inode))
114 return ERR_CAST(inode);
115 if (S_ISREG(inode->i_mode))
116 HFSPLUS_I(inode)->linkid = linkid;
117 out:
118 d_add(dentry, inode);
119 return NULL;
120 fail:
121 hfs_find_exit(&fd);
122 return ERR_PTR(err);
125 static int hfsplus_readdir(struct file *file, struct dir_context *ctx)
127 struct inode *inode = file_inode(file);
128 struct super_block *sb = inode->i_sb;
129 int len, err;
130 char strbuf[HFSPLUS_MAX_STRLEN + 1];
131 hfsplus_cat_entry entry;
132 struct hfs_find_data fd;
133 struct hfsplus_readdir_data *rd;
134 u16 type;
136 if (file->f_pos >= inode->i_size)
137 return 0;
139 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
140 if (err)
141 return err;
142 hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
143 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
144 if (err)
145 goto out;
147 if (ctx->pos == 0) {
148 /* This is completely artificial... */
149 if (!dir_emit_dot(file, ctx))
150 goto out;
151 ctx->pos = 1;
153 if (ctx->pos == 1) {
154 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
155 err = -EIO;
156 goto out;
159 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
160 fd.entrylength);
161 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
162 pr_err("bad catalog folder thread\n");
163 err = -EIO;
164 goto out;
166 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
167 pr_err("truncated catalog thread\n");
168 err = -EIO;
169 goto out;
171 if (!dir_emit(ctx, "..", 2,
172 be32_to_cpu(entry.thread.parentID), DT_DIR))
173 goto out;
174 ctx->pos = 2;
176 if (ctx->pos >= inode->i_size)
177 goto out;
178 err = hfs_brec_goto(&fd, ctx->pos - 1);
179 if (err)
180 goto out;
181 for (;;) {
182 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
183 pr_err("walked past end of dir\n");
184 err = -EIO;
185 goto out;
188 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
189 err = -EIO;
190 goto out;
193 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
194 fd.entrylength);
195 type = be16_to_cpu(entry.type);
196 len = HFSPLUS_MAX_STRLEN;
197 err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
198 if (err)
199 goto out;
200 if (type == HFSPLUS_FOLDER) {
201 if (fd.entrylength <
202 sizeof(struct hfsplus_cat_folder)) {
203 pr_err("small dir entry\n");
204 err = -EIO;
205 goto out;
207 if (HFSPLUS_SB(sb)->hidden_dir &&
208 HFSPLUS_SB(sb)->hidden_dir->i_ino ==
209 be32_to_cpu(entry.folder.id))
210 goto next;
211 if (!dir_emit(ctx, strbuf, len,
212 be32_to_cpu(entry.folder.id), DT_DIR))
213 break;
214 } else if (type == HFSPLUS_FILE) {
215 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
216 pr_err("small file entry\n");
217 err = -EIO;
218 goto out;
220 if (!dir_emit(ctx, strbuf, len,
221 be32_to_cpu(entry.file.id), DT_REG))
222 break;
223 } else {
224 pr_err("bad catalog entry type\n");
225 err = -EIO;
226 goto out;
228 next:
229 ctx->pos++;
230 if (ctx->pos >= inode->i_size)
231 goto out;
232 err = hfs_brec_goto(&fd, 1);
233 if (err)
234 goto out;
236 rd = file->private_data;
237 if (!rd) {
238 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
239 if (!rd) {
240 err = -ENOMEM;
241 goto out;
243 file->private_data = rd;
244 rd->file = file;
245 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
247 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
248 out:
249 hfs_find_exit(&fd);
250 return err;
253 static int hfsplus_dir_release(struct inode *inode, struct file *file)
255 struct hfsplus_readdir_data *rd = file->private_data;
256 if (rd) {
257 mutex_lock(&inode->i_mutex);
258 list_del(&rd->list);
259 mutex_unlock(&inode->i_mutex);
260 kfree(rd);
262 return 0;
265 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
266 struct dentry *dst_dentry)
268 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
269 struct inode *inode = src_dentry->d_inode;
270 struct inode *src_dir = src_dentry->d_parent->d_inode;
271 struct qstr str;
272 char name[32];
273 u32 cnid, id;
274 int res;
276 if (HFSPLUS_IS_RSRC(inode))
277 return -EPERM;
278 if (!S_ISREG(inode->i_mode))
279 return -EPERM;
281 mutex_lock(&sbi->vh_mutex);
282 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
283 for (;;) {
284 get_random_bytes(&id, sizeof(cnid));
285 id &= 0x3fffffff;
286 str.name = name;
287 str.len = sprintf(name, "iNode%d", id);
288 res = hfsplus_rename_cat(inode->i_ino,
289 src_dir, &src_dentry->d_name,
290 sbi->hidden_dir, &str);
291 if (!res)
292 break;
293 if (res != -EEXIST)
294 goto out;
296 HFSPLUS_I(inode)->linkid = id;
297 cnid = sbi->next_cnid++;
298 src_dentry->d_fsdata = (void *)(unsigned long)cnid;
299 res = hfsplus_create_cat(cnid, src_dir,
300 &src_dentry->d_name, inode);
301 if (res)
302 /* panic? */
303 goto out;
304 sbi->file_count++;
306 cnid = sbi->next_cnid++;
307 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
308 if (res)
309 goto out;
311 inc_nlink(inode);
312 hfsplus_instantiate(dst_dentry, inode, cnid);
313 ihold(inode);
314 inode->i_ctime = CURRENT_TIME_SEC;
315 mark_inode_dirty(inode);
316 sbi->file_count++;
317 hfsplus_mark_mdb_dirty(dst_dir->i_sb);
318 out:
319 mutex_unlock(&sbi->vh_mutex);
320 return res;
323 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
325 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
326 struct inode *inode = dentry->d_inode;
327 struct qstr str;
328 char name[32];
329 u32 cnid;
330 int res;
332 if (HFSPLUS_IS_RSRC(inode))
333 return -EPERM;
335 mutex_lock(&sbi->vh_mutex);
336 cnid = (u32)(unsigned long)dentry->d_fsdata;
337 if (inode->i_ino == cnid &&
338 atomic_read(&HFSPLUS_I(inode)->opencnt)) {
339 str.name = name;
340 str.len = sprintf(name, "temp%lu", inode->i_ino);
341 res = hfsplus_rename_cat(inode->i_ino,
342 dir, &dentry->d_name,
343 sbi->hidden_dir, &str);
344 if (!res) {
345 inode->i_flags |= S_DEAD;
346 drop_nlink(inode);
348 goto out;
350 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
351 if (res)
352 goto out;
354 if (inode->i_nlink > 0)
355 drop_nlink(inode);
356 if (inode->i_ino == cnid)
357 clear_nlink(inode);
358 if (!inode->i_nlink) {
359 if (inode->i_ino != cnid) {
360 sbi->file_count--;
361 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
362 res = hfsplus_delete_cat(inode->i_ino,
363 sbi->hidden_dir,
364 NULL);
365 if (!res)
366 hfsplus_delete_inode(inode);
367 } else
368 inode->i_flags |= S_DEAD;
369 } else
370 hfsplus_delete_inode(inode);
371 } else
372 sbi->file_count--;
373 inode->i_ctime = CURRENT_TIME_SEC;
374 mark_inode_dirty(inode);
375 out:
376 mutex_unlock(&sbi->vh_mutex);
377 return res;
380 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
382 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
383 struct inode *inode = dentry->d_inode;
384 int res;
386 if (inode->i_size != 2)
387 return -ENOTEMPTY;
389 mutex_lock(&sbi->vh_mutex);
390 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
391 if (res)
392 goto out;
393 clear_nlink(inode);
394 inode->i_ctime = CURRENT_TIME_SEC;
395 hfsplus_delete_inode(inode);
396 mark_inode_dirty(inode);
397 out:
398 mutex_unlock(&sbi->vh_mutex);
399 return res;
402 static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
403 const char *symname)
405 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
406 struct inode *inode;
407 int res = -ENOSPC;
409 mutex_lock(&sbi->vh_mutex);
410 inode = hfsplus_new_inode(dir->i_sb, S_IFLNK | S_IRWXUGO);
411 if (!inode)
412 goto out;
414 res = page_symlink(inode, symname, strlen(symname) + 1);
415 if (res)
416 goto out_err;
418 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
419 if (res)
420 goto out_err;
422 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
423 if (res == -EOPNOTSUPP)
424 res = 0; /* Operation is not supported. */
425 else if (res) {
426 /* Try to delete anyway without error analysis. */
427 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
428 goto out_err;
431 hfsplus_instantiate(dentry, inode, inode->i_ino);
432 mark_inode_dirty(inode);
433 goto out;
435 out_err:
436 clear_nlink(inode);
437 hfsplus_delete_inode(inode);
438 iput(inode);
439 out:
440 mutex_unlock(&sbi->vh_mutex);
441 return res;
444 static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
445 umode_t mode, dev_t rdev)
447 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
448 struct inode *inode;
449 int res = -ENOSPC;
451 mutex_lock(&sbi->vh_mutex);
452 inode = hfsplus_new_inode(dir->i_sb, mode);
453 if (!inode)
454 goto out;
456 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
457 init_special_inode(inode, mode, rdev);
459 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
460 if (res)
461 goto failed_mknod;
463 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
464 if (res == -EOPNOTSUPP)
465 res = 0; /* Operation is not supported. */
466 else if (res) {
467 /* Try to delete anyway without error analysis. */
468 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
469 goto failed_mknod;
472 hfsplus_instantiate(dentry, inode, inode->i_ino);
473 mark_inode_dirty(inode);
474 goto out;
476 failed_mknod:
477 clear_nlink(inode);
478 hfsplus_delete_inode(inode);
479 iput(inode);
480 out:
481 mutex_unlock(&sbi->vh_mutex);
482 return res;
485 static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode,
486 bool excl)
488 return hfsplus_mknod(dir, dentry, mode, 0);
491 static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
493 return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0);
496 static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
497 struct inode *new_dir, struct dentry *new_dentry)
499 int res;
501 /* Unlink destination if it already exists */
502 if (new_dentry->d_inode) {
503 if (S_ISDIR(new_dentry->d_inode->i_mode))
504 res = hfsplus_rmdir(new_dir, new_dentry);
505 else
506 res = hfsplus_unlink(new_dir, new_dentry);
507 if (res)
508 return res;
511 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
512 old_dir, &old_dentry->d_name,
513 new_dir, &new_dentry->d_name);
514 if (!res)
515 new_dentry->d_fsdata = old_dentry->d_fsdata;
516 return res;
519 const struct inode_operations hfsplus_dir_inode_operations = {
520 .lookup = hfsplus_lookup,
521 .create = hfsplus_create,
522 .link = hfsplus_link,
523 .unlink = hfsplus_unlink,
524 .mkdir = hfsplus_mkdir,
525 .rmdir = hfsplus_rmdir,
526 .symlink = hfsplus_symlink,
527 .mknod = hfsplus_mknod,
528 .rename = hfsplus_rename,
529 .setxattr = generic_setxattr,
530 .getxattr = generic_getxattr,
531 .listxattr = hfsplus_listxattr,
532 .removexattr = generic_removexattr,
533 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
534 .get_acl = hfsplus_get_posix_acl,
535 .set_acl = hfsplus_set_posix_acl,
536 #endif
539 const struct file_operations hfsplus_dir_operations = {
540 .fsync = hfsplus_file_fsync,
541 .read = generic_read_dir,
542 .iterate = hfsplus_readdir,
543 .unlocked_ioctl = hfsplus_ioctl,
544 .llseek = generic_file_llseek,
545 .release = hfsplus_dir_release,