/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * linux/cluster/ssi/cfs/symlink.c * * 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, GOOD TITLE * or NON INFRINGEMENT. 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; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net * * Copyright (C) 1992 Rick Sladkey * * Optimization changes Copyright (C) 1994 Florian La Roche * * Jun 7 1999, cache symlink lookups in the page cache. -DaveM * * Portions Copyright (C) 2001 Compaq Computer Corporation * * ocfs2 symlink handling code. * * Copyright (C) 2004, 2005 Oracle. * */ #include <linux/fs.h> #include <linux/types.h> #include <linux/slab.h> #include <linux/pagemap.h> #include <linux/namei.h> #define MLOG_MASK_PREFIX ML_NAMEI #include <cluster/masklog.h> #include "ocfs2.h" #include "alloc.h" #include "file.h" #include "inode.h" #include "journal.h" #include "symlink.h" #include "xattr.h" #include "buffer_head_io.h" static char *ocfs2_fast_symlink_getlink(struct inode *inode, struct buffer_head **bh) { int status; char *link = NULL; struct ocfs2_dinode *fe; mlog_entry_void(); status = ocfs2_read_inode_block(inode, bh); if (status < 0) { mlog_errno(status); link = ERR_PTR(status); goto bail; } fe = (struct ocfs2_dinode *) (*bh)->b_data; link = (char *) fe->id2.i_symlink; bail: mlog_exit(status); return link; } static int ocfs2_readlink(struct dentry *dentry, char __user *buffer, int buflen) { int ret; char *link; struct buffer_head *bh = NULL; struct inode *inode = dentry->d_inode; mlog_entry_void(); link = ocfs2_fast_symlink_getlink(inode, &bh); if (IS_ERR(link)) { ret = PTR_ERR(link); goto out; } /* * Without vfsmount we can't update atime now, * but we will update atime here ultimately. */ ret = vfs_readlink(dentry, buffer, buflen, link); brelse(bh); out: mlog_exit(ret); return ret; } static void *ocfs2_fast_follow_link(struct dentry *dentry, struct nameidata *nd) { int status = 0; int len; char *target, *link = ERR_PTR(-ENOMEM); struct inode *inode = dentry->d_inode; struct buffer_head *bh = NULL; mlog_entry_void(); BUG_ON(!ocfs2_inode_is_fast_symlink(inode)); target = ocfs2_fast_symlink_getlink(inode, &bh); if (IS_ERR(target)) { status = PTR_ERR(target); mlog_errno(status); goto bail; } /* Fast symlinks can't be large */ len = strlen(target); link = kzalloc(len + 1, GFP_NOFS); if (!link) { status = -ENOMEM; mlog_errno(status); goto bail; } memcpy(link, target, len); bail: nd_set_link(nd, status ? ERR_PTR(status) : link); brelse(bh); mlog_exit(status); return NULL; } static void ocfs2_fast_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie) { char *link = nd_get_link(nd); if (!IS_ERR(link)) kfree(link); } const struct inode_operations ocfs2_symlink_inode_operations = { .readlink = page_readlink, .follow_link = page_follow_link_light, .put_link = page_put_link, .getattr = ocfs2_getattr, .setattr = ocfs2_setattr, .setxattr = generic_setxattr, .getxattr = generic_getxattr, .listxattr = ocfs2_listxattr, .removexattr = generic_removexattr, .fiemap = ocfs2_fiemap, }; const struct inode_operations ocfs2_fast_symlink_inode_operations = { .readlink = ocfs2_readlink, .follow_link = ocfs2_fast_follow_link, .put_link = ocfs2_fast_put_link, .getattr = ocfs2_getattr, .setattr = ocfs2_setattr, .setxattr = generic_setxattr, .getxattr = generic_getxattr, .listxattr = ocfs2_listxattr, .removexattr = generic_removexattr, .fiemap = ocfs2_fiemap, };