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    SubjectRe: [PATCH v3 109/110] namei: handle absolute symlinks without dropping out of RCU mode
    On Mon, May 11, 2015 at 07:08:09PM +0100, Al Viro wrote:
    > @@ -499,7 +499,7 @@ struct nameidata {
    > struct path root;
    > struct inode *inode; /* path.dentry.d_inode */
    > unsigned int flags;
    > - unsigned seq, m_seq;
    > + unsigned seq, m_seq, root_seq;
    > int last_type;
    > unsigned depth;
    > int total_link_count;
    > @@ -780,14 +780,14 @@ static __always_inline void set_root(struct nameidata *nd)
    > static __always_inline unsigned set_root_rcu(struct nameidata *nd)
    > {
    > struct fs_struct *fs = current->fs;
    > - unsigned seq, res;
    > + unsigned seq;
    >
    > do {
    > seq = read_seqcount_begin(&fs->seq);
    > nd->root = fs->root;
    > - res = __read_seqcount_begin(&nd->root.dentry->d_seq);
    > + nd->root_seq = __read_seqcount_begin(&nd->root.dentry->d_seq);

    nd->root_seq is also needed in LOOKUP_ROOT | LOOKUP_RCU case. Fixed and
    folded.


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