2 * linux/fs/hfsplus/dir.c
5 * Brad Boyer (flar@allandria.com)
6 * (C) 2003 Ardis Technologies <roman@ardistech.com>
8 * Handling of directories
11 #include <linux/errno.h>
13 #include <linux/slab.h>
14 #include <linux/random.h>
16 #include "hfsplus_fs.h"
17 #include "hfsplus_raw.h"
19 static inline void hfsplus_instantiate(struct dentry *dentry,
20 struct inode *inode, u32 cnid)
22 dentry->d_fsdata = (void *)(unsigned long)cnid;
23 d_instantiate(dentry, inode);
26 /* Find the entry inside dir named dentry->d_name */
27 static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
30 struct inode *inode = NULL;
31 struct hfs_find_data fd;
32 struct super_block *sb;
33 hfsplus_cat_entry entry;
40 d_set_d_op(dentry, &hfsplus_dentry_operations);
41 dentry->d_fsdata = NULL;
42 hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
43 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
45 err = hfs_brec_read(&fd, &entry, sizeof(entry));
55 type = be16_to_cpu(entry.type);
56 if (type == HFSPLUS_FOLDER) {
57 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
61 cnid = be32_to_cpu(entry.folder.id);
62 dentry->d_fsdata = (void *)(unsigned long)cnid;
63 } else if (type == HFSPLUS_FILE) {
64 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
68 cnid = be32_to_cpu(entry.file.id);
69 if (entry.file.user_info.fdType ==
70 cpu_to_be32(HFSP_HARDLINK_TYPE) &&
71 entry.file.user_info.fdCreator ==
72 cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
73 (entry.file.create_date ==
74 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
76 entry.file.create_date ==
77 HFSPLUS_I(sb->s_root->d_inode)->
79 HFSPLUS_SB(sb)->hidden_dir) {
83 if (dentry->d_fsdata) {
85 * We found a link pointing to another link,
86 * so ignore it and treat it as regular file.
88 cnid = (unsigned long)dentry->d_fsdata;
91 dentry->d_fsdata = (void *)(unsigned long)cnid;
93 be32_to_cpu(entry.file.permissions.dev);
94 str.len = sprintf(name, "iNode%d", linkid);
96 hfsplus_cat_build_key(sb, fd.search_key,
97 HFSPLUS_SB(sb)->hidden_dir->i_ino,
101 } else if (!dentry->d_fsdata)
102 dentry->d_fsdata = (void *)(unsigned long)cnid;
104 printk(KERN_ERR "hfs: invalid catalog entry type in lookup\n");
109 inode = hfsplus_iget(dir->i_sb, cnid);
111 return ERR_CAST(inode);
112 if (S_ISREG(inode->i_mode))
113 HFSPLUS_I(inode)->linkid = linkid;
115 d_add(dentry, inode);
122 static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir)
124 struct inode *inode = filp->f_path.dentry->d_inode;
125 struct super_block *sb = inode->i_sb;
127 char strbuf[HFSPLUS_MAX_STRLEN + 1];
128 hfsplus_cat_entry entry;
129 struct hfs_find_data fd;
130 struct hfsplus_readdir_data *rd;
133 if (filp->f_pos >= inode->i_size)
136 hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
137 hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
138 err = hfs_brec_find(&fd);
142 switch ((u32)filp->f_pos) {
144 /* This is completely artificial... */
145 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
150 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
152 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
153 printk(KERN_ERR "hfs: bad catalog folder thread\n");
157 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
158 printk(KERN_ERR "hfs: truncated catalog thread\n");
162 if (filldir(dirent, "..", 2, 1,
163 be32_to_cpu(entry.thread.parentID), DT_DIR))
168 if (filp->f_pos >= inode->i_size)
170 err = hfs_brec_goto(&fd, filp->f_pos - 1);
176 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
177 printk(KERN_ERR "hfs: walked past end of dir\n");
181 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
183 type = be16_to_cpu(entry.type);
184 len = HFSPLUS_MAX_STRLEN;
185 err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
188 if (type == HFSPLUS_FOLDER) {
190 sizeof(struct hfsplus_cat_folder)) {
191 printk(KERN_ERR "hfs: small dir entry\n");
195 if (HFSPLUS_SB(sb)->hidden_dir &&
196 HFSPLUS_SB(sb)->hidden_dir->i_ino ==
197 be32_to_cpu(entry.folder.id))
199 if (filldir(dirent, strbuf, len, filp->f_pos,
200 be32_to_cpu(entry.folder.id), DT_DIR))
202 } else if (type == HFSPLUS_FILE) {
203 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
204 printk(KERN_ERR "hfs: small file entry\n");
208 if (filldir(dirent, strbuf, len, filp->f_pos,
209 be32_to_cpu(entry.file.id), DT_REG))
212 printk(KERN_ERR "hfs: bad catalog entry type\n");
218 if (filp->f_pos >= inode->i_size)
220 err = hfs_brec_goto(&fd, 1);
224 rd = filp->private_data;
226 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
231 filp->private_data = rd;
233 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
235 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
241 static int hfsplus_dir_release(struct inode *inode, struct file *file)
243 struct hfsplus_readdir_data *rd = file->private_data;
245 mutex_lock(&inode->i_mutex);
247 mutex_unlock(&inode->i_mutex);
253 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
254 struct dentry *dst_dentry)
256 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
257 struct inode *inode = src_dentry->d_inode;
258 struct inode *src_dir = src_dentry->d_parent->d_inode;
264 if (HFSPLUS_IS_RSRC(inode))
266 if (!S_ISREG(inode->i_mode))
269 mutex_lock(&sbi->vh_mutex);
270 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
272 get_random_bytes(&id, sizeof(cnid));
275 str.len = sprintf(name, "iNode%d", id);
276 res = hfsplus_rename_cat(inode->i_ino,
277 src_dir, &src_dentry->d_name,
278 sbi->hidden_dir, &str);
284 HFSPLUS_I(inode)->linkid = id;
285 cnid = sbi->next_cnid++;
286 src_dentry->d_fsdata = (void *)(unsigned long)cnid;
287 res = hfsplus_create_cat(cnid, src_dir,
288 &src_dentry->d_name, inode);
294 cnid = sbi->next_cnid++;
295 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
300 hfsplus_instantiate(dst_dentry, inode, cnid);
302 inode->i_ctime = CURRENT_TIME_SEC;
303 mark_inode_dirty(inode);
305 dst_dir->i_sb->s_dirt = 1;
307 mutex_unlock(&sbi->vh_mutex);
311 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
313 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
314 struct inode *inode = dentry->d_inode;
320 if (HFSPLUS_IS_RSRC(inode))
323 mutex_lock(&sbi->vh_mutex);
324 cnid = (u32)(unsigned long)dentry->d_fsdata;
325 if (inode->i_ino == cnid &&
326 atomic_read(&HFSPLUS_I(inode)->opencnt)) {
328 str.len = sprintf(name, "temp%lu", inode->i_ino);
329 res = hfsplus_rename_cat(inode->i_ino,
330 dir, &dentry->d_name,
331 sbi->hidden_dir, &str);
333 inode->i_flags |= S_DEAD;
338 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
342 if (inode->i_nlink > 0)
344 if (inode->i_ino == cnid)
346 if (!inode->i_nlink) {
347 if (inode->i_ino != cnid) {
349 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
350 res = hfsplus_delete_cat(inode->i_ino,
354 hfsplus_delete_inode(inode);
356 inode->i_flags |= S_DEAD;
358 hfsplus_delete_inode(inode);
361 inode->i_ctime = CURRENT_TIME_SEC;
362 mark_inode_dirty(inode);
364 mutex_unlock(&sbi->vh_mutex);
368 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
370 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
371 struct inode *inode = dentry->d_inode;
374 if (inode->i_size != 2)
377 mutex_lock(&sbi->vh_mutex);
378 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
382 inode->i_ctime = CURRENT_TIME_SEC;
383 hfsplus_delete_inode(inode);
384 mark_inode_dirty(inode);
386 mutex_unlock(&sbi->vh_mutex);
390 static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
393 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
397 mutex_lock(&sbi->vh_mutex);
398 inode = hfsplus_new_inode(dir->i_sb, S_IFLNK | S_IRWXUGO);
402 res = page_symlink(inode, symname, strlen(symname) + 1);
406 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
410 hfsplus_instantiate(dentry, inode, inode->i_ino);
411 mark_inode_dirty(inode);
416 hfsplus_delete_inode(inode);
419 mutex_unlock(&sbi->vh_mutex);
423 static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
424 int mode, dev_t rdev)
426 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
430 mutex_lock(&sbi->vh_mutex);
431 inode = hfsplus_new_inode(dir->i_sb, mode);
435 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
436 init_special_inode(inode, mode, rdev);
438 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
441 hfsplus_delete_inode(inode);
446 hfsplus_instantiate(dentry, inode, inode->i_ino);
447 mark_inode_dirty(inode);
449 mutex_unlock(&sbi->vh_mutex);
453 static int hfsplus_create(struct inode *dir, struct dentry *dentry, int mode,
454 struct nameidata *nd)
456 return hfsplus_mknod(dir, dentry, mode, 0);
459 static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, int mode)
461 return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0);
464 static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
465 struct inode *new_dir, struct dentry *new_dentry)
469 /* Unlink destination if it already exists */
470 if (new_dentry->d_inode) {
471 if (S_ISDIR(new_dentry->d_inode->i_mode))
472 res = hfsplus_rmdir(new_dir, new_dentry);
474 res = hfsplus_unlink(new_dir, new_dentry);
479 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
480 old_dir, &old_dentry->d_name,
481 new_dir, &new_dentry->d_name);
483 new_dentry->d_fsdata = old_dentry->d_fsdata;
487 const struct inode_operations hfsplus_dir_inode_operations = {
488 .lookup = hfsplus_lookup,
489 .create = hfsplus_create,
490 .link = hfsplus_link,
491 .unlink = hfsplus_unlink,
492 .mkdir = hfsplus_mkdir,
493 .rmdir = hfsplus_rmdir,
494 .symlink = hfsplus_symlink,
495 .mknod = hfsplus_mknod,
496 .rename = hfsplus_rename,
499 const struct file_operations hfsplus_dir_operations = {
500 .fsync = hfsplus_file_fsync,
501 .read = generic_read_dir,
502 .readdir = hfsplus_readdir,
503 .unlocked_ioctl = hfsplus_ioctl,
504 .llseek = generic_file_llseek,
505 .release = hfsplus_dir_release,