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
16 #include <asm/uaccess.h>
17 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/affs_fs.h>
21 #include <linux/stat.h>
22 #include <linux/string.h>
24 #include <linux/amigaffs.h>
25 #include <linux/smp_lock.h>
26 #include <linux/buffer_head.h>
28 static int affs_readdir(struct file *, void *, filldir_t);
30 struct file_operations affs_dir_operations = {
31 .read = generic_read_dir,
32 .readdir = affs_readdir,
37 * directories can handle most operations...
39 struct inode_operations affs_dir_inode_operations = {
40 .create = affs_create,
41 .lookup = affs_lookup,
43 .unlink = affs_unlink,
44 .symlink = affs_symlink,
47 .rename = affs_rename,
48 .setattr = affs_notify_change,
52 affs_readdir(struct file *filp, void *dirent, filldir_t filldir)
54 struct inode *inode = filp->f_dentry->d_inode;
55 struct super_block *sb = inode->i_sb;
56 struct buffer_head *dir_bh;
57 struct buffer_head *fh_bh;
68 pr_debug("AFFS: readdir(ino=%lu,f_pos=%lx)\n",inode->i_ino,(unsigned long)filp->f_pos);
77 filp->private_data = (void *)0;
78 if (filldir(dirent, ".", 1, f_pos, inode->i_ino, DT_DIR) < 0)
80 filp->f_pos = f_pos = 1;
84 if (filldir(dirent, "..", 2, f_pos, parent_ino(filp->f_dentry), DT_DIR) < 0)
86 filp->f_pos = f_pos = 2;
91 chain_pos = (f_pos - 2) & 0xffff;
92 hash_pos = (f_pos - 2) >> 16;
93 if (chain_pos == 0xffff) {
94 affs_warning(sb, "readdir", "More than 65535 entries in chain");
97 filp->f_pos = ((hash_pos << 16) | chain_pos) + 2;
99 dir_bh = affs_bread(sb, inode->i_ino);
103 /* If the directory hasn't changed since the last call to readdir(),
104 * we can jump directly to where we left off.
106 ino = (u32)(long)filp->private_data;
107 if (ino && filp->f_version == inode->i_version) {
108 pr_debug("AFFS: readdir() left off=%d\n", ino);
112 ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
113 for (i = 0; ino && i < chain_pos; i++) {
114 fh_bh = affs_bread(sb, ino);
116 affs_error(sb, "readdir","Cannot read block %d", i);
119 ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
127 for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) {
128 ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
131 f_pos = (hash_pos << 16) + 2;
134 fh_bh = affs_bread(sb, ino);
136 affs_error(sb, "readdir","Cannot read block %d", ino);
140 namelen = min(AFFS_TAIL(sb, fh_bh)->name[0], (u8)30);
141 name = AFFS_TAIL(sb, fh_bh)->name + 1;
142 pr_debug("AFFS: readdir(): filldir(\"%.*s\", ino=%u), hash=%d, f_pos=%x\n",
143 namelen, name, ino, hash_pos, f_pos);
144 if (filldir(dirent, name, namelen, f_pos, ino, DT_UNKNOWN) < 0)
148 ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
155 filp->f_version = inode->i_version;
156 filp->private_data = (void *)(long)ino;
162 affs_unlock_dir(inode);
163 pr_debug("AFFS: readdir()=%d\n", stored);