1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/hfsplus/dir.c
6 * Brad Boyer (flar@allandria.com)
7 * (C) 2003 Ardis Technologies <roman@ardistech.com>
9 * Handling of directories
12 #include <linux/errno.h>
14 #include <linux/slab.h>
15 #include <linux/random.h>
16 #include <linux/nls.h>
18 #include "hfsplus_fs.h"
19 #include "hfsplus_raw.h"
22 static inline void hfsplus_instantiate(struct dentry *dentry,
23 struct inode *inode, u32 cnid)
25 dentry->d_fsdata = (void *)(unsigned long)cnid;
26 d_instantiate(dentry, inode);
29 /* Find the entry inside dir named dentry->d_name */
30 static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
33 struct inode *inode = NULL;
34 struct hfs_find_data fd;
35 struct super_block *sb;
36 hfsplus_cat_entry entry;
43 dentry->d_fsdata = NULL;
44 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
47 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino,
49 if (unlikely(err < 0))
52 err = hfs_brec_read(&fd, &entry, sizeof(entry));
62 type = be16_to_cpu(entry.type);
63 if (type == HFSPLUS_FOLDER) {
64 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
68 cnid = be32_to_cpu(entry.folder.id);
69 dentry->d_fsdata = (void *)(unsigned long)cnid;
70 } else if (type == HFSPLUS_FILE) {
71 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
75 cnid = be32_to_cpu(entry.file.id);
76 if (entry.file.user_info.fdType ==
77 cpu_to_be32(HFSP_HARDLINK_TYPE) &&
78 entry.file.user_info.fdCreator ==
79 cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
80 HFSPLUS_SB(sb)->hidden_dir &&
81 (entry.file.create_date ==
82 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
84 entry.file.create_date ==
85 HFSPLUS_I(d_inode(sb->s_root))->
90 if (dentry->d_fsdata) {
92 * We found a link pointing to another link,
93 * so ignore it and treat it as regular file.
95 cnid = (unsigned long)dentry->d_fsdata;
98 dentry->d_fsdata = (void *)(unsigned long)cnid;
100 be32_to_cpu(entry.file.permissions.dev);
101 str.len = sprintf(name, "iNode%d", linkid);
103 err = hfsplus_cat_build_key(sb, fd.search_key,
104 HFSPLUS_SB(sb)->hidden_dir->i_ino,
106 if (unlikely(err < 0))
110 } else if (!dentry->d_fsdata)
111 dentry->d_fsdata = (void *)(unsigned long)cnid;
113 pr_err("invalid catalog entry type in lookup\n");
118 inode = hfsplus_iget(dir->i_sb, cnid);
120 return ERR_CAST(inode);
121 if (S_ISREG(inode->i_mode))
122 HFSPLUS_I(inode)->linkid = linkid;
124 return d_splice_alias(inode, dentry);
130 static int hfsplus_readdir(struct file *file, struct dir_context *ctx)
132 struct inode *inode = file_inode(file);
133 struct super_block *sb = inode->i_sb;
136 hfsplus_cat_entry entry;
137 struct hfs_find_data fd;
138 struct hfsplus_readdir_data *rd;
141 if (file->f_pos >= inode->i_size)
144 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
147 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL);
152 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino);
153 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
158 /* This is completely artificial... */
159 if (!dir_emit_dot(file, ctx))
164 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
169 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
171 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
172 pr_err("bad catalog folder thread\n");
176 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
177 pr_err("truncated catalog thread\n");
181 if (!dir_emit(ctx, "..", 2,
182 be32_to_cpu(entry.thread.parentID), DT_DIR))
186 if (ctx->pos >= inode->i_size)
188 err = hfs_brec_goto(&fd, ctx->pos - 1);
192 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
193 pr_err("walked past end of dir\n");
198 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
203 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
205 type = be16_to_cpu(entry.type);
206 len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN;
207 err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
210 if (type == HFSPLUS_FOLDER) {
212 sizeof(struct hfsplus_cat_folder)) {
213 pr_err("small dir entry\n");
217 if (HFSPLUS_SB(sb)->hidden_dir &&
218 HFSPLUS_SB(sb)->hidden_dir->i_ino ==
219 be32_to_cpu(entry.folder.id))
221 if (!dir_emit(ctx, strbuf, len,
222 be32_to_cpu(entry.folder.id), DT_DIR))
224 } else if (type == HFSPLUS_FILE) {
226 unsigned type = DT_UNKNOWN;
228 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
229 pr_err("small file entry\n");
234 mode = be16_to_cpu(entry.file.permissions.mode);
237 else if (S_ISLNK(mode))
239 else if (S_ISFIFO(mode))
241 else if (S_ISCHR(mode))
243 else if (S_ISBLK(mode))
245 else if (S_ISSOCK(mode))
248 if (!dir_emit(ctx, strbuf, len,
249 be32_to_cpu(entry.file.id), type))
252 pr_err("bad catalog entry type\n");
258 if (ctx->pos >= inode->i_size)
260 err = hfs_brec_goto(&fd, 1);
264 rd = file->private_data;
266 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
271 file->private_data = rd;
273 spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
274 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
275 spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
278 * Can be done after the list insertion; exclusion with
279 * hfsplus_delete_cat() is provided by directory lock.
281 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
288 static int hfsplus_dir_release(struct inode *inode, struct file *file)
290 struct hfsplus_readdir_data *rd = file->private_data;
292 spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
294 spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
300 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
301 struct dentry *dst_dentry)
303 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
304 struct inode *inode = d_inode(src_dentry);
305 struct inode *src_dir = d_inode(src_dentry->d_parent);
311 if (HFSPLUS_IS_RSRC(inode))
313 if (!S_ISREG(inode->i_mode))
316 mutex_lock(&sbi->vh_mutex);
317 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
319 get_random_bytes(&id, sizeof(cnid));
322 str.len = sprintf(name, "iNode%d", id);
323 res = hfsplus_rename_cat(inode->i_ino,
324 src_dir, &src_dentry->d_name,
325 sbi->hidden_dir, &str);
331 HFSPLUS_I(inode)->linkid = id;
332 cnid = sbi->next_cnid++;
333 src_dentry->d_fsdata = (void *)(unsigned long)cnid;
334 res = hfsplus_create_cat(cnid, src_dir,
335 &src_dentry->d_name, inode);
341 cnid = sbi->next_cnid++;
342 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
347 hfsplus_instantiate(dst_dentry, inode, cnid);
349 inode->i_ctime = current_time(inode);
350 mark_inode_dirty(inode);
352 hfsplus_mark_mdb_dirty(dst_dir->i_sb);
354 mutex_unlock(&sbi->vh_mutex);
358 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
360 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
361 struct inode *inode = d_inode(dentry);
367 if (HFSPLUS_IS_RSRC(inode))
370 mutex_lock(&sbi->vh_mutex);
371 cnid = (u32)(unsigned long)dentry->d_fsdata;
372 if (inode->i_ino == cnid &&
373 atomic_read(&HFSPLUS_I(inode)->opencnt)) {
375 str.len = sprintf(name, "temp%lu", inode->i_ino);
376 res = hfsplus_rename_cat(inode->i_ino,
377 dir, &dentry->d_name,
378 sbi->hidden_dir, &str);
380 inode->i_flags |= S_DEAD;
385 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
389 if (inode->i_nlink > 0)
391 if (inode->i_ino == cnid)
393 if (!inode->i_nlink) {
394 if (inode->i_ino != cnid) {
396 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
397 res = hfsplus_delete_cat(inode->i_ino,
401 hfsplus_delete_inode(inode);
403 inode->i_flags |= S_DEAD;
405 hfsplus_delete_inode(inode);
408 inode->i_ctime = current_time(inode);
409 mark_inode_dirty(inode);
411 mutex_unlock(&sbi->vh_mutex);
415 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
417 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
418 struct inode *inode = d_inode(dentry);
421 if (inode->i_size != 2)
424 mutex_lock(&sbi->vh_mutex);
425 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
429 inode->i_ctime = current_time(inode);
430 hfsplus_delete_inode(inode);
431 mark_inode_dirty(inode);
433 mutex_unlock(&sbi->vh_mutex);
437 static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
440 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
444 mutex_lock(&sbi->vh_mutex);
445 inode = hfsplus_new_inode(dir->i_sb, dir, S_IFLNK | S_IRWXUGO);
449 res = page_symlink(inode, symname, strlen(symname) + 1);
453 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
457 res = hfsplus_init_security(inode, dir, &dentry->d_name);
458 if (res == -EOPNOTSUPP)
459 res = 0; /* Operation is not supported. */
461 /* Try to delete anyway without error analysis. */
462 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
466 hfsplus_instantiate(dentry, inode, inode->i_ino);
467 mark_inode_dirty(inode);
472 hfsplus_delete_inode(inode);
475 mutex_unlock(&sbi->vh_mutex);
479 static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
480 umode_t mode, dev_t rdev)
482 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
486 mutex_lock(&sbi->vh_mutex);
487 inode = hfsplus_new_inode(dir->i_sb, dir, mode);
491 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
492 init_special_inode(inode, mode, rdev);
494 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
498 res = hfsplus_init_security(inode, dir, &dentry->d_name);
499 if (res == -EOPNOTSUPP)
500 res = 0; /* Operation is not supported. */
502 /* Try to delete anyway without error analysis. */
503 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
507 hfsplus_instantiate(dentry, inode, inode->i_ino);
508 mark_inode_dirty(inode);
513 hfsplus_delete_inode(inode);
516 mutex_unlock(&sbi->vh_mutex);
520 static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode,
523 return hfsplus_mknod(dir, dentry, mode, 0);
526 static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
528 return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0);
531 static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
532 struct inode *new_dir, struct dentry *new_dentry,
537 if (flags & ~RENAME_NOREPLACE)
540 /* Unlink destination if it already exists */
541 if (d_really_is_positive(new_dentry)) {
542 if (d_is_dir(new_dentry))
543 res = hfsplus_rmdir(new_dir, new_dentry);
545 res = hfsplus_unlink(new_dir, new_dentry);
550 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
551 old_dir, &old_dentry->d_name,
552 new_dir, &new_dentry->d_name);
554 new_dentry->d_fsdata = old_dentry->d_fsdata;
558 const struct inode_operations hfsplus_dir_inode_operations = {
559 .lookup = hfsplus_lookup,
560 .create = hfsplus_create,
561 .link = hfsplus_link,
562 .unlink = hfsplus_unlink,
563 .mkdir = hfsplus_mkdir,
564 .rmdir = hfsplus_rmdir,
565 .symlink = hfsplus_symlink,
566 .mknod = hfsplus_mknod,
567 .rename = hfsplus_rename,
568 .getattr = hfsplus_getattr,
569 .listxattr = hfsplus_listxattr,
572 const struct file_operations hfsplus_dir_operations = {
573 .fsync = hfsplus_file_fsync,
574 .read = generic_read_dir,
575 .iterate_shared = hfsplus_readdir,
576 .unlocked_ioctl = hfsplus_ioctl,
577 .llseek = generic_file_llseek,
578 .release = hfsplus_dir_release,