From 75c3f29de7451677c59580b0a959f694f36aac28 Mon Sep 17 00:00:00 2001 From: Dave Hansen Date: Fri, 15 Feb 2008 14:37:45 -0800 Subject: [PATCH] r/o bind mounts: write counts for link/symlink [AV: add missing nfsd pieces] Acked-by: Al Viro Signed-off-by: Christoph Hellwig Signed-off-by: Dave Hansen Signed-off-by: Al Viro --- fs/namei.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'fs/namei.c') diff --git a/fs/namei.c b/fs/namei.c index 3fbcf2021a2e..00df735fb509 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2387,7 +2387,12 @@ asmlinkage long sys_symlinkat(const char __user *oldname, if (IS_ERR(dentry)) goto out_unlock; + error = mnt_want_write(nd.path.mnt); + if (error) + goto out_dput; error = vfs_symlink(nd.path.dentry->d_inode, dentry, from, S_IALLUGO); + mnt_drop_write(nd.path.mnt); +out_dput: dput(dentry); out_unlock: mutex_unlock(&nd.path.dentry->d_inode->i_mutex); @@ -2482,7 +2487,12 @@ asmlinkage long sys_linkat(int olddfd, const char __user *oldname, error = PTR_ERR(new_dentry); if (IS_ERR(new_dentry)) goto out_unlock; + error = mnt_want_write(nd.path.mnt); + if (error) + goto out_dput; error = vfs_link(old_nd.path.dentry, nd.path.dentry->d_inode, new_dentry); + mnt_drop_write(nd.path.mnt); +out_dput: dput(new_dentry); out_unlock: mutex_unlock(&nd.path.dentry->d_inode->i_mutex); -- cgit v1.2.2