/* *  linux/fs/xiafs/symlink.c * *  Copyright (C) Q. Frank Xia, 1993. *   *  Based on Linus' minix/symlink.c *  Copyright (C) Linus Torvalds, 1991, 1992. * *  This software may be redistributed per Linux Copyright. */#include <linux/errno.h>#include <linux/sched.h>#include <linux/fs.h>#include <linux/xia_fs.h>#include <linux/stat.h>#include <asm/segment.h>static int xiafs_readlink(struct inode *, char *, int);static int xiafs_follow_link(struct inode *, struct inode *, int, int, struct inode **);/* * symlinks can't do much... */struct inode_operations xiafs_symlink_inode_operations = {	NULL,			/* no file-operations */	NULL,			/* create */	NULL,			/* lookup */	NULL,			/* link */	NULL,			/* unlink */	NULL,			/* symlink */	NULL,			/* mkdir */	NULL,			/* rmdir */	NULL,			/* mknod */	NULL,			/* rename */	xiafs_readlink,		/* readlink */	xiafs_follow_link,	/* follow_link */	NULL,			/* readpage */	NULL,			/* writepage */	NULL,			/* bmap */	NULL,			/* truncate */	NULL			/* permission */};static int xiafs_readlink(struct inode * inode, char * buffer, int buflen){    struct buffer_head * bh;    int i;    char c;    if (!S_ISLNK(inode->i_mode)) {        iput(inode);	return -EINVAL;    }    if (buflen > BLOCK_SIZE)        buflen = BLOCK_SIZE;    bh = xiafs_bread(inode, 0, 0);    if (!IS_RDONLY (inode)) { 	inode->i_atime=CURRENT_TIME; 	inode->i_dirt=1;    }    iput(inode);    if (!bh)        return 0;    for (i=0; i < buflen && (c=bh->b_data[i]); i++)      put_user(c, buffer++);    if (i < buflen-1)      put_user('\0', buffer);    brelse(bh);    return i;}static int xiafs_follow_link(struct inode * dir, struct inode * inode,	int flag, int mode, struct inode ** res_inode){    int error;    struct buffer_head * bh;    *res_inode = NULL;    if (!dir) {        dir = current->fs->root;	dir->i_count++;    }    if (!inode) {        iput(dir);	return -ENOENT;    }    if (!S_ISLNK(inode->i_mode)) {        iput(dir);	*res_inode = inode;	return 0;    }    if (!IS_RDONLY (inode)) {	inode->i_atime=CURRENT_TIME;	inode->i_dirt=1;    }    if (current->link_count > 5) {        iput(inode);	iput(dir);	return -ELOOP;    }    if (!(bh = xiafs_bread(inode, 0, 0))) {        iput(inode);        iput(dir);	return -EIO;    }    iput(inode);    current->link_count++;    error = open_namei(bh->b_data,flag,mode,res_inode,dir);    current->link_count--;    brelse(bh);    return error;}