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SubjectRe: [PATCH 05/17] Remove the automount through follow_link() kludge code from pathwalk
On Thu, Sep 30, 2010 at 07:15:21PM +0100, David Howells wrote:
> Remove the automount through follow_link() kludge code from pathwalk in favour
> of using d_automount().
>
> Signed-off-by: David Howells <dhowells@redhat.com>
> Acked-by: Ian Kent <raven@themaw.net>
> ---
>
> fs/namei.c | 17 +++--------------
> 1 files changed, 3 insertions(+), 14 deletions(-)
>
> diff --git a/fs/namei.c b/fs/namei.c
> index c50b9d7..86421f9 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -861,17 +861,6 @@ fail:
> }
>
> /*
> - * This is a temporary kludge to deal with "automount" symlinks; proper
> - * solution is to trigger them on follow_mount(), so that do_lookup()
> - * would DTRT. To be killed before 2.6.34-final.
> - */
> -static inline int follow_on_final(struct inode *inode, unsigned lookup_flags)
> -{
> - return inode && unlikely(inode->i_op->follow_link) &&
> - ((lookup_flags & LOOKUP_FOLLOW) || S_ISDIR(inode->i_mode));
> -}
> -
> -/*
> * Name resolution.
> * This is the basic name resolution function, turning a pathname into
> * the final dentry. We expect 'base' to be positive and a directory.
> @@ -991,7 +980,8 @@ last_component:
> if (err)
> break;
> inode = next.dentry->d_inode;
> - if (follow_on_final(inode, lookup_flags)) {
> + if (inode && unlikely(inode->i_op->follow_link) &&
> + (lookup_flags & LOOKUP_FOLLOW)) {
> err = do_follow_link(&next, nd);
> if (err)
> goto return_err;
> @@ -1882,8 +1872,7 @@ reval:
> struct inode *inode = path.dentry->d_inode;
> void *cookie;
> error = -ELOOP;
> - /* S_ISDIR part is a temporary automount kludge */
> - if (!(nd.flags & LOOKUP_FOLLOW) && !S_ISDIR(inode->i_mode))
> + if (!(nd.flags & LOOKUP_FOLLOW))
> goto exit_dput;
> if (count++ == 32)
> goto exit_dput;

While you're removing kludges, I bet you can also remove this from
__follow_link():

if (path->mnt != nd->mnt) {
path_to_nameidata(path, nd);
dget(dentry);
}
mntget(path->mnt);
And replace with:

if (path->mnt == nd->mnt)
mntget(path->mnt);
This reverts the non-helper-function parts of
051d381259eb57d6074d02a6ba6e90e744f1a29f, which breaks union mounts.

-VAL


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