4 * (c) 1996 Hans-Joachim Widmaier - Rewritten
6 * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
8 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
10 * (C) 1991 Linus Torvalds - minix filesystem
12 * affs directory handling functions
18 static int affs_readdir(struct file *, void *, filldir_t);
20 const struct file_operations affs_dir_operations = {
21 .read = generic_read_dir,
22 .llseek = generic_file_llseek,
23 .readdir = affs_readdir,
24 .fsync = affs_file_fsync,
28 * directories can handle most operations...
30 const struct inode_operations affs_dir_inode_operations = {
31 .create = affs_create,
32 .lookup = affs_lookup,
34 .unlink = affs_unlink,
35 .symlink = affs_symlink,
38 .rename = affs_rename,
39 .setattr = affs_notify_change,
43 affs_readdir(struct file *filp, void *dirent, filldir_t filldir)
45 struct inode *inode = filp->f_path.dentry->d_inode;
46 struct super_block *sb = inode->i_sb;
47 struct buffer_head *dir_bh;
48 struct buffer_head *fh_bh;
59 pr_debug("AFFS: readdir(ino=%lu,f_pos=%lx)\n",inode->i_ino,(unsigned long)filp->f_pos);
68 filp->private_data = (void *)0;
69 if (filldir(dirent, ".", 1, f_pos, inode->i_ino, DT_DIR) < 0)
71 filp->f_pos = f_pos = 1;
75 if (filldir(dirent, "..", 2, f_pos, parent_ino(filp->f_path.dentry), DT_DIR) < 0)
77 filp->f_pos = f_pos = 2;
82 chain_pos = (f_pos - 2) & 0xffff;
83 hash_pos = (f_pos - 2) >> 16;
84 if (chain_pos == 0xffff) {
85 affs_warning(sb, "readdir", "More than 65535 entries in chain");
88 filp->f_pos = ((hash_pos << 16) | chain_pos) + 2;
90 dir_bh = affs_bread(sb, inode->i_ino);
94 /* If the directory hasn't changed since the last call to readdir(),
95 * we can jump directly to where we left off.
97 ino = (u32)(long)filp->private_data;
98 if (ino && filp->f_version == inode->i_version) {
99 pr_debug("AFFS: readdir() left off=%d\n", ino);
103 ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
104 for (i = 0; ino && i < chain_pos; i++) {
105 fh_bh = affs_bread(sb, ino);
107 affs_error(sb, "readdir","Cannot read block %d", i);
110 ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
118 for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) {
119 ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
122 f_pos = (hash_pos << 16) + 2;
125 fh_bh = affs_bread(sb, ino);
127 affs_error(sb, "readdir","Cannot read block %d", ino);
131 namelen = min(AFFS_TAIL(sb, fh_bh)->name[0], (u8)30);
132 name = AFFS_TAIL(sb, fh_bh)->name + 1;
133 pr_debug("AFFS: readdir(): filldir(\"%.*s\", ino=%u), hash=%d, f_pos=%x\n",
134 namelen, name, ino, hash_pos, f_pos);
135 if (filldir(dirent, name, namelen, f_pos, ino, DT_UNKNOWN) < 0)
139 ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
146 filp->f_version = inode->i_version;
147 filp->private_data = (void *)(long)ino;
153 affs_unlock_dir(inode);
154 pr_debug("AFFS: readdir()=%d\n", stored);