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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [fs/] [ext/] [symlink.c] - Blame information for rev 1778

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Line No. Rev Author Line
1 199 simons 
/*
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 *  linux/fs/ext/symlink.c
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 *
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 *  Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
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 *
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 *  from
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 *
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 *  linux/fs/minix/symlink.c
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 *
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 *  Copyright (C) 1991, 1992  Linus Torvalds
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 *
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 *  ext symlink handling code
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 */
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#include <asm/segment.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/ext_fs.h>
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#include <linux/stat.h>
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static int ext_readlink(struct inode *, char *, int);
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static int ext_follow_link(struct inode *, struct inode *, int, int, struct inode **);
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/*
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 * symlinks can't do much...
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 */
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struct inode_operations ext_symlink_inode_operations = {
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        NULL,                   /* no file-operations */
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        NULL,                   /* create */
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        NULL,                   /* lookup */
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        NULL,                   /* link */
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        NULL,                   /* unlink */
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        NULL,                   /* symlink */
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        NULL,                   /* mkdir */
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        NULL,                   /* rmdir */
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        NULL,                   /* mknod */
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        NULL,                   /* rename */
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        ext_readlink,           /* readlink */
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        ext_follow_link,        /* follow_link */
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        NULL,                   /* readpage */
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        NULL,                   /* writepage */
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        NULL,                   /* bmap */
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        NULL,                   /* truncate */
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        NULL                    /* permission */
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};
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static int ext_follow_link(struct inode * dir, struct inode * inode,
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        int flag, int mode, struct inode ** res_inode)
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{
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        int error;
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        struct buffer_head * bh;
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        *res_inode = NULL;
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        if (!dir) {
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                dir = current->fs->root;
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                dir->i_count++;
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        }
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        if (!inode) {
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                iput(dir);
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                return -ENOENT;
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        }
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        if (!S_ISLNK(inode->i_mode)) {
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                iput(dir);
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                *res_inode = inode;
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                return 0;
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        }
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        if (current->link_count > 5) {
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                iput(dir);
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                iput(inode);
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                return -ELOOP;
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        }
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        if (!(bh = ext_bread(inode, 0, 0))) {
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                iput(inode);
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                iput(dir);
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                return -EIO;
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        }
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        iput(inode);
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        current->link_count++;
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        error = open_namei(bh->b_data,flag,mode,res_inode,dir);
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        current->link_count--;
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        brelse(bh);
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        return error;
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}
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static int ext_readlink(struct inode * inode, char * buffer, int buflen)
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{
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        struct buffer_head * bh;
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        int i;
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        char c;
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        if (!S_ISLNK(inode->i_mode)) {
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                iput(inode);
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                return -EINVAL;
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        }
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        if (buflen > 1023)
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                buflen = 1023;
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        bh = ext_bread(inode, 0, 0);
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        iput(inode);
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        if (!bh)
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                return 0;
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        i = 0;
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        while (i<buflen && (c = bh->b_data[i])) {
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                i++;
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                put_user(c,buffer++);
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        }
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        brelse(bh);
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        return i;
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}

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