1 files changed, 155 insertions, 0 deletions

diff --git a/fs/affs/dir.c b/fs/affs/dir.c
new file mode 100644
index 000000000000..548efd0ee98c
--- /dev/null
+++ b/fs/affs/dir.c
@@ -0,0 +1,155 @@
+/*
+ *  linux/fs/affs/dir.c
+ *
+ *  (c) 1996  Hans-Joachim Widmaier - Rewritten
+ *
+ *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
+ *
+ *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
+ *
+ *  (C) 1991  Linus Torvalds - minix filesystem
+ *
+ *  affs directory handling functions
+ *
+ */
+
+#include "affs.h"
+
+static int affs_readdir(struct file *, void *, filldir_t);
+
+struct file_operations affs_dir_operations = {
+        .read           = generic_read_dir,
+        .readdir        = affs_readdir,
+        .fsync          = file_fsync,
+};
+
+/*
+ * directories can handle most operations...
+ */
+struct inode_operations affs_dir_inode_operations = {
+        .create         = affs_create,
+        .lookup         = affs_lookup,
+        .link           = affs_link,
+        .unlink         = affs_unlink,
+        .symlink        = affs_symlink,
+        .mkdir          = affs_mkdir,
+        .rmdir          = affs_rmdir,
+        .rename         = affs_rename,
+        .setattr        = affs_notify_change,
+};
+
+static int
+affs_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+        struct inode            *inode = filp->f_dentry->d_inode;
+        struct super_block      *sb = inode->i_sb;
+        struct buffer_head      *dir_bh;
+        struct buffer_head      *fh_bh;
+        unsigned char           *name;
+        int                      namelen;
+        u32                      i;
+        int                      hash_pos;
+        int                      chain_pos;
+        u32                      f_pos;
+        u32                      ino;
+        int                      stored;
+        int                      res;
+
+        pr_debug("AFFS: readdir(ino=%lu,f_pos=%lx)\n",inode->i_ino,(unsigned long)filp->f_pos);
+
+        stored = 0;
+        res    = -EIO;
+        dir_bh = NULL;
+        fh_bh  = NULL;
+        f_pos  = filp->f_pos;
+
+        if (f_pos == 0) {
+                filp->private_data = (void *)0;
+                if (filldir(dirent, ".", 1, f_pos, inode->i_ino, DT_DIR) < 0)
+                        return 0;
+                filp->f_pos = f_pos = 1;
+                stored++;
+        }
+        if (f_pos == 1) {
+                if (filldir(dirent, "..", 2, f_pos, parent_ino(filp->f_dentry), DT_DIR) < 0)
+                        return stored;
+                filp->f_pos = f_pos = 2;
+                stored++;
+        }
+
+        affs_lock_dir(inode);
+        chain_pos = (f_pos - 2) & 0xffff;
+        hash_pos  = (f_pos - 2) >> 16;
+        if (chain_pos == 0xffff) {
+                affs_warning(sb, "readdir", "More than 65535 entries in chain");
+                chain_pos = 0;
+                hash_pos++;
+                filp->f_pos = ((hash_pos << 16) | chain_pos) + 2;
+        }
+        dir_bh = affs_bread(sb, inode->i_ino);
+        if (!dir_bh)
+                goto readdir_out;
+
+        /* If the directory hasn't changed since the last call to readdir(),
+         * we can jump directly to where we left off.
+         */
+        ino = (u32)(long)filp->private_data;
+        if (ino && filp->f_version == inode->i_version) {
+                pr_debug("AFFS: readdir() left off=%d\n", ino);
+                goto inside;
+        }
+
+        ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
+        for (i = 0; ino && i < chain_pos; i++) {
+                fh_bh = affs_bread(sb, ino);
+                if (!fh_bh) {
+                        affs_error(sb, "readdir","Cannot read block %d", i);
+                        goto readdir_out;
+                }
+                ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
+                affs_brelse(fh_bh);
+                fh_bh = NULL;
+        }
+        if (ino)
+                goto inside;
+        hash_pos++;
+
+        for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) {
+                ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
+                if (!ino)
+                        continue;
+                f_pos = (hash_pos << 16) + 2;
+inside:
+                do {
+                        fh_bh = affs_bread(sb, ino);
+                        if (!fh_bh) {
+                                affs_error(sb, "readdir","Cannot read block %d", ino);
+                                goto readdir_done;
+                        }
+
+                        namelen = min(AFFS_TAIL(sb, fh_bh)->name[0], (u8)30);
+                        name = AFFS_TAIL(sb, fh_bh)->name + 1;
+                        pr_debug("AFFS: readdir(): filldir(\"%.*s\", ino=%u), hash=%d, f_pos=%x\n",
+                                 namelen, name, ino, hash_pos, f_pos);
+                        if (filldir(dirent, name, namelen, f_pos, ino, DT_UNKNOWN) < 0)
+                                goto readdir_done;
+                        stored++;
+                        f_pos++;
+                        ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
+                        affs_brelse(fh_bh);
+                        fh_bh = NULL;
+                } while (ino);
+        }
+readdir_done:
+        filp->f_pos = f_pos;
+        filp->f_version = inode->i_version;
+        filp->private_data = (void *)(long)ino;
+        res = stored;
+
+readdir_out:
+        affs_brelse(dir_bh);
+        affs_brelse(fh_bh);
+        affs_unlock_dir(inode);
+        pr_debug("AFFS: readdir()=%d\n", stored);
+        return res;
+}