From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753838Ab0H0LDp (ORCPT ); Fri, 27 Aug 2010 07:03:45 -0400 Received: from e23smtp06.au.ibm.com ([202.81.31.148]:52522 "EHLO e23smtp06.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753488Ab0H0LDk (ORCPT ); Fri, 27 Aug 2010 07:03:40 -0400 From: "Aneesh Kumar K.V" To: hch@infradead.org, viro@zeniv.linux.org.uk, adilger@sun.com, corbet@lwn.net, neilb@suse.de, npiggin@kernel.dk, hooanon05@yahoo.co.jp, bfields@fieldses.org, miklos@szeredi.hu Cc: linux-fsdevel@vger.kernel.org, sfrench@us.ibm.com, philippe.deniel@CEA.FR, linux-kernel@vger.kernel.org, "Aneesh Kumar K.V" Subject: [PATCH -V19 04/15] vfs: Add handle based readlink syscall Date: Fri, 27 Aug 2010 16:32:51 +0530 Message-Id: <1282906982-26918-5-git-send-email-aneesh.kumar@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1282906982-26918-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1282906982-26918-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Aneesh Kumar K.V --- fs/stat.c | 28 ++++++++++++++++++++++++++++ include/linux/syscalls.h | 3 +++ 2 files changed, 31 insertions(+), 0 deletions(-) diff --git a/fs/stat.c b/fs/stat.c index 12e90e2..29052eb 100644 --- a/fs/stat.c +++ b/fs/stat.c @@ -319,6 +319,34 @@ SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf, return sys_readlinkat(AT_FDCWD, path, buf, bufsiz); } +SYSCALL_DEFINE4(handle_readlink, int, mountdirfd, + struct file_handle __user *, ufh, + char __user *, buf, int, bufsiz) +{ + long retval = 0; + struct path path; + struct inode *inode; + + if (bufsiz <= 0) + return -EINVAL; + retval = handle_to_path(mountdirfd, ufh, &path); + if (retval) + goto out_err; + + inode = path.dentry->d_inode; + retval = -EINVAL; + if (inode->i_op->readlink) { + retval = security_inode_readlink(path.dentry); + if (!retval) { + touch_atime(path.mnt, path.dentry); + retval = inode->i_op->readlink(path.dentry, + buf, bufsiz); + } + } + path_put(&path); +out_err: + return retval; +} /* ---------- LFS-64 ----------- */ #ifdef __ARCH_WANT_STAT64 diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index 4dc527c..35ecae3 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -838,4 +838,7 @@ asmlinkage long sys_name_to_handle_at(int dfd, const char __user *name, asmlinkage long sys_open_by_handle_at(int mountdirfd, struct file_handle __user *handle, int flags); +asmlinkage long sys_handle_readlink(int mountdirfd, + struct file_handle __user *ufh, + char __user *buf, int bufsiz); #endif -- 1.7.0.4