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1628 |
jcastillo |
/*
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* linux/fs/xiafs/dir.c
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*
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* Copyright (C) Q. Frank Xia, 1993.
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*
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* Based on Linus' minix/dir.c
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* Copyright (C) Linus Torvalds, 1991, 1992.
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*
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* This software may be redistributed per Linux Copyright.
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*/
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/xia_fs.h>
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#include <linux/stat.h>
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#include <asm/segment.h>
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#include "xiafs_mac.h"
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static int xiafs_dir_read(struct inode *, struct file *, char *, int);
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static int xiafs_readdir(struct inode *, struct file *, void *, filldir_t);
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static struct file_operations xiafs_dir_operations = {
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NULL, /* lseek - default */
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xiafs_dir_read, /* read */
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NULL, /* write - bad */
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xiafs_readdir, /* readdir */
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NULL, /* select - default */
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NULL, /* ioctl - default */
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NULL, /* mmap */
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NULL, /* no special open code */
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NULL, /* no special release code */
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file_fsync /* default 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 xiafs_dir_inode_operations = {
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&xiafs_dir_operations, /* default directory file-ops */
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xiafs_create, /* create */
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xiafs_lookup, /* lookup */
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xiafs_link, /* link */
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xiafs_unlink, /* unlink */
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xiafs_symlink, /* symlink */
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xiafs_mkdir, /* mkdir */
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xiafs_rmdir, /* rmdir */
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xiafs_mknod, /* mknod */
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xiafs_rename, /* rename */
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NULL, /* readlink */
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NULL, /* follow_link */
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NULL, /* readpage */
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NULL, /* writepage */
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NULL, /* bmap */
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xiafs_truncate, /* truncate */
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NULL /* permission */
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};
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static int xiafs_dir_read(struct inode * inode,
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struct file * filp, char * buf, int count)
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{
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return -EISDIR;
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}
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static int xiafs_readdir(struct inode * inode, struct file * filp,
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void * dirent, filldir_t filldir)
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{
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u_int offset, i;
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struct buffer_head * bh;
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struct xiafs_direct * de;
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if (!inode || !inode->i_sb || !S_ISDIR(inode->i_mode))
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return -EBADF;
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if (inode->i_size & (XIAFS_ZSIZE(inode->i_sb) - 1) )
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return -EBADF;
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while (filp->f_pos < inode->i_size) {
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offset = filp->f_pos & (XIAFS_ZSIZE(inode->i_sb) - 1);
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bh = xiafs_bread(inode, filp->f_pos >> XIAFS_ZSIZE_BITS(inode->i_sb),0);
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if (!bh) {
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filp->f_pos += XIAFS_ZSIZE(inode->i_sb)-offset;
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continue;
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}
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for (i = 0; i < XIAFS_ZSIZE(inode->i_sb) && i < offset; ) {
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de = (struct xiafs_direct *) (bh->b_data + i);
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if (!de->d_rec_len)
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break;
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i += de->d_rec_len;
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}
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offset = i;
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de = (struct xiafs_direct *) (offset + bh->b_data);
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while (offset < XIAFS_ZSIZE(inode->i_sb) && filp->f_pos < inode->i_size) {
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if (de->d_ino > inode->i_sb->u.xiafs_sb.s_ninodes ||
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de->d_rec_len < 12 ||
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(char *)de+de->d_rec_len > XIAFS_ZSIZE(inode->i_sb)+bh->b_data ||
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de->d_name_len < 1 || de->d_name_len + 8 > de->d_rec_len ||
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de->d_name_len > _XIAFS_NAME_LEN ||
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de->d_name[de->d_name_len] ) {
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printk("XIA-FS: bad directory entry (%s %d)\n", WHERE_ERR);
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brelse(bh);
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return 0;
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}
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if (de->d_ino) {
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if (!IS_RDONLY (inode)) {
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inode->i_atime=CURRENT_TIME;
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inode->i_dirt=1;
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}
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if (filldir(dirent, de->d_name, de->d_name_len, filp->f_pos, de->d_ino) < 0) {
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brelse(bh);
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return 0;
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}
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}
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offset += de->d_rec_len;
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filp->f_pos += de->d_rec_len;
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de = (struct xiafs_direct *) (offset + bh->b_data);
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}
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brelse(bh);
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if (offset > XIAFS_ZSIZE(inode->i_sb)) {
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printk("XIA-FS: bad directory (%s %d)\n", WHERE_ERR);
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return 0;
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}
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}
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if (!IS_RDONLY (inode)) {
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inode->i_atime=CURRENT_TIME;
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inode->i_dirt=1;
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}
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return 0;
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}
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