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/**
* Copyright (c) 2008-2010 Alper Akcan <alper.akcan@gmail.com>
* Copyright (c) 2009-2010 Renzo Davoli <renzo@cs.unibo.it>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (in the main directory of the fuse-ext2
* distribution in the file COPYING); if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "fuse-ext2.h"
int op_readlink (const char *path, char *buf, size_t size)
{
int rt;
size_t s;
errcode_t rc;
ext2_ino_t ino;
char *b = NULL;
char *pathname;
struct ext2_inode inode;
ext2_filsys e2fs;
FUSE_EXT2_LOCK;
e2fs = current_ext2fs();
debugf("enter");
debugf("path = %s", path);
rt = do_readinode(e2fs, path, &ino, &inode);
if (rt) {
debugf("do_readinode(%s, &ino, &inode); failed", path);
goto err;
}
if (!LINUX_S_ISLNK(inode.i_mode)) {
debugf("%s is not a link", path);
rt = -EINVAL;
goto err;
}
if (ext2fs_inode_data_blocks(e2fs, &inode)) {
rc = ext2fs_get_mem(EXT2_BLOCK_SIZE(e2fs->super), &b);
if (rc) {
debugf("ext2fs_get_mem(EXT2_BLOCK_SIZE(e2fs->super), &b); failed");
rt = -ENOMEM;
goto err;
}
rc = io_channel_read_blk(e2fs->io, inode.i_block[0], 1, b);
if (rc) {
ext2fs_free_mem(&b);
debugf("io_channel_read_blk(e2fs->io, inode.i_block[0], 1, b); failed");
rt = -EIO;
goto err;
}
pathname = b;
} else {
pathname = (char *) &(inode.i_block[0]);
}
debugf("pathname: %s", pathname);
s = (size < strlen(pathname) + 1) ? size : strlen(pathname) + 1;
snprintf(buf, s, "%s", pathname);
if (b) {
ext2fs_free_mem(&b);
}
debugf("leave");
FUSE_EXT2_UNLOCK;
return 0;
err:
FUSE_EXT2_UNLOCK;
return rt;
}
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