1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
155 lines
3.7 KiB
C
155 lines
3.7 KiB
C
/*
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* linux/fs/affs/dir.c
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*
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* (c) 1996 Hans-Joachim Widmaier - Rewritten
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*
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* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
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*
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* (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
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*
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* (C) 1991 Linus Torvalds - minix filesystem
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*
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* affs directory handling functions
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*
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*/
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#include "affs.h"
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static int affs_readdir(struct file *, void *, filldir_t);
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struct file_operations affs_dir_operations = {
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.read = generic_read_dir,
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.readdir = affs_readdir,
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.fsync = file_fsync,
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};
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/*
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* directories can handle most operations...
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*/
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struct inode_operations affs_dir_inode_operations = {
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.create = affs_create,
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.lookup = affs_lookup,
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.link = affs_link,
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.unlink = affs_unlink,
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.symlink = affs_symlink,
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.mkdir = affs_mkdir,
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.rmdir = affs_rmdir,
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.rename = affs_rename,
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.setattr = affs_notify_change,
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};
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static int
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affs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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struct inode *inode = filp->f_dentry->d_inode;
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struct super_block *sb = inode->i_sb;
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struct buffer_head *dir_bh;
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struct buffer_head *fh_bh;
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unsigned char *name;
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int namelen;
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u32 i;
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int hash_pos;
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int chain_pos;
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u32 f_pos;
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u32 ino;
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int stored;
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int res;
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pr_debug("AFFS: readdir(ino=%lu,f_pos=%lx)\n",inode->i_ino,(unsigned long)filp->f_pos);
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stored = 0;
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res = -EIO;
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dir_bh = NULL;
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fh_bh = NULL;
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f_pos = filp->f_pos;
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if (f_pos == 0) {
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filp->private_data = (void *)0;
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if (filldir(dirent, ".", 1, f_pos, inode->i_ino, DT_DIR) < 0)
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return 0;
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filp->f_pos = f_pos = 1;
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stored++;
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}
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if (f_pos == 1) {
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if (filldir(dirent, "..", 2, f_pos, parent_ino(filp->f_dentry), DT_DIR) < 0)
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return stored;
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filp->f_pos = f_pos = 2;
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stored++;
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}
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affs_lock_dir(inode);
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chain_pos = (f_pos - 2) & 0xffff;
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hash_pos = (f_pos - 2) >> 16;
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if (chain_pos == 0xffff) {
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affs_warning(sb, "readdir", "More than 65535 entries in chain");
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chain_pos = 0;
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hash_pos++;
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filp->f_pos = ((hash_pos << 16) | chain_pos) + 2;
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}
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dir_bh = affs_bread(sb, inode->i_ino);
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if (!dir_bh)
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goto readdir_out;
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/* If the directory hasn't changed since the last call to readdir(),
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* we can jump directly to where we left off.
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*/
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ino = (u32)(long)filp->private_data;
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if (ino && filp->f_version == inode->i_version) {
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pr_debug("AFFS: readdir() left off=%d\n", ino);
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goto inside;
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}
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ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
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for (i = 0; ino && i < chain_pos; i++) {
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fh_bh = affs_bread(sb, ino);
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if (!fh_bh) {
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affs_error(sb, "readdir","Cannot read block %d", i);
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goto readdir_out;
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}
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ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
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affs_brelse(fh_bh);
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fh_bh = NULL;
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}
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if (ino)
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goto inside;
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hash_pos++;
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for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) {
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ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]);
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if (!ino)
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continue;
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f_pos = (hash_pos << 16) + 2;
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inside:
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do {
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fh_bh = affs_bread(sb, ino);
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if (!fh_bh) {
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affs_error(sb, "readdir","Cannot read block %d", ino);
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goto readdir_done;
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}
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namelen = min(AFFS_TAIL(sb, fh_bh)->name[0], (u8)30);
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name = AFFS_TAIL(sb, fh_bh)->name + 1;
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pr_debug("AFFS: readdir(): filldir(\"%.*s\", ino=%u), hash=%d, f_pos=%x\n",
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namelen, name, ino, hash_pos, f_pos);
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if (filldir(dirent, name, namelen, f_pos, ino, DT_UNKNOWN) < 0)
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goto readdir_done;
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stored++;
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f_pos++;
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ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain);
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affs_brelse(fh_bh);
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fh_bh = NULL;
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} while (ino);
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}
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readdir_done:
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filp->f_pos = f_pos;
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filp->f_version = inode->i_version;
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filp->private_data = (void *)(long)ino;
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res = stored;
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readdir_out:
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affs_brelse(dir_bh);
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affs_brelse(fh_bh);
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affs_unlock_dir(inode);
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pr_debug("AFFS: readdir()=%d\n", stored);
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return res;
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}
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