From 9ac9b8474c39c3ae2c2b37d8e1f08db8a9146124 Mon Sep 17 00:00:00 2001 From: Dave Hansen Date: Fri, 15 Feb 2008 14:37:52 -0800 Subject: [PATCH] [PATCH] r/o bind mounts: write counts for truncate() Acked-by: Al Viro Signed-off-by: Christoph Hellwig Signed-off-by: Dave Hansen Signed-off-by: Al Viro --- fs/open.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/fs/open.c b/fs/open.c index e2df8fd..4d690e3 100644 --- a/fs/open.c +++ b/fs/open.c @@ -244,21 +244,21 @@ static long do_sys_truncate(const char __user * path, loff_t length) if (!S_ISREG(inode->i_mode)) goto dput_and_out; - error = vfs_permission(&nd, MAY_WRITE); + error = mnt_want_write(nd.path.mnt); if (error) goto dput_and_out; - error = -EROFS; - if (IS_RDONLY(inode)) - goto dput_and_out; + error = vfs_permission(&nd, MAY_WRITE); + if (error) + goto mnt_drop_write_and_out; error = -EPERM; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) - goto dput_and_out; + goto mnt_drop_write_and_out; error = get_write_access(inode); if (error) - goto dput_and_out; + goto mnt_drop_write_and_out; /* * Make sure that there are no leases. get_write_access() protects @@ -276,6 +276,8 @@ static long do_sys_truncate(const char __user * path, loff_t length) put_write_and_out: put_write_access(inode); +mnt_drop_write_and_out: + mnt_drop_write(nd.path.mnt); dput_and_out: path_put(&nd.path); out: -- 2.7.4