/* *  linux/fs/sysv/dir.c * *  minix/dir.c *  Copyright (C) 1991, 1992  Linus Torvalds * *  coh/dir.c *  Copyright (C) 1993  Pascal Haible, Bruno Haible * *  sysv/dir.c *  Copyright (C) 1993  Bruno Haible * *  SystemV/Coherent directory handling functions */#include <linux/errno.h>#include <linux/fs.h>#include <linux/sysv_fs.h>#include <linux/stat.h>#include <linux/string.h>static int sysv_readdir(struct file *, void *, filldir_t);struct file_operations sysv_dir_operations = {	read:		generic_read_dir,	readdir:	sysv_readdir,	fsync:		file_fsync,};static int sysv_readdir(struct file * filp, void * dirent, filldir_t filldir){	struct inode *inode = filp->f_dentry->d_inode;	struct super_block * sb = inode->i_sb;	unsigned int offset,i;	struct buffer_head * bh;	char* bh_data;	struct sysv_dir_entry * de, sde;	if ((unsigned long)(filp->f_pos) % SYSV_DIRSIZE)		return -EBADF;	while (filp->f_pos < inode->i_size) {		offset = filp->f_pos & sb->sv_block_size_1;		bh = sysv_file_bread(inode, filp->f_pos >> sb->sv_block_size_bits, 0);		if (!bh) {			filp->f_pos += sb->sv_block_size - offset;			continue;		}		bh_data = bh->b_data;		while (offset < sb->sv_block_size && filp->f_pos < inode->i_size) {			de = (struct sysv_dir_entry *) (offset + bh_data);			if (de->inode) {				/* Copy the directory entry first, because the directory				 * might be modified while we sleep in filldir()...				 */				memcpy(&sde, de, sizeof(struct sysv_dir_entry));				if (sde.inode > inode->i_sb->sv_ninodes)					printk("sysv_readdir: Bad inode number on dev "					       "%s, ino %ld, offset 0x%04lx: %d is out of range\n",					       kdevname(inode->i_dev),					       inode->i_ino, (off_t) filp->f_pos, sde.inode);				i = strnlen(sde.name, SYSV_NAMELEN);				if (filldir(dirent, sde.name, i, filp->f_pos, sde.inode, DT_UNKNOWN) < 0) {					brelse(bh);					return 0;				}			}			offset += SYSV_DIRSIZE;			filp->f_pos += SYSV_DIRSIZE;		}		brelse(bh);	}	return 0;}