linux-kernel - [PATCH -V19 07/15] vfs: Add handle based chown syscall

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Message-Id: <1282906982-26918-8-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
Date:	Fri, 27 Aug 2010 16:32:54 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	hch@...radead.org, viro@...iv.linux.org.uk, adilger@....com,
	corbet@....net, neilb@...e.de, npiggin@...nel.dk,
	hooanon05@...oo.co.jp, bfields@...ldses.org, miklos@...redi.hu
Cc:	linux-fsdevel@...r.kernel.org, sfrench@...ibm.com,
	philippe.deniel@....FR, linux-kernel@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH -V19 07/15] vfs: Add handle based chown syscall

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
 fs/open.c                |   20 ++++++++++++++++++++
 include/linux/syscalls.h |    2 ++
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/fs/open.c b/fs/open.c
index 7abdcba..5e06c12 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -623,6 +623,26 @@ out:
 	return error;
 }
 
+SYSCALL_DEFINE4(handle_chown, int, mountdirfd, struct file_handle __user *, ufh,
+		uid_t, user, gid_t, group)
+{
+	struct path path;
+	int error = -EINVAL;
+
+	error = handle_to_path(mountdirfd, ufh, &path);
+	if (error)
+		goto out;
+	error = mnt_want_write(path.mnt);
+	if (error)
+		goto out_release;
+	error = chown_common(&path, user, group);
+	mnt_drop_write(path.mnt);
+out_release:
+	path_put(&path);
+out:
+	return error;
+}
+
 /*
  * You have to be very careful that these write
  * counts get cleaned up in error cases and
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 9c82364..6dab72b 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -852,4 +852,6 @@ asmlinkage long sys_handle_stat(int mountdirfd,
 #endif
 asmlinkage long sys_handle_link(int mountdirfd, struct file_handle __user *uofh,
 				int newfd, const char __user *newname);
+asmlinkage long sys_handle_chown(int mountdirfd, struct file_handle __user *ufh,
+				 uid_t user, gid_t group);
 #endif
-- 
1.7.0.4

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