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lookup_fast(): clean up the logics around the fallback to non-rcu mode 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-01-09 01:35:39 -05:00
parent ad1633a151
commit 209a7fb210
1 changed files with 6 additions and 8 deletions
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14
fs/namei.c
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@ -1558,12 +1558,7 @@ static int lookup_fast(struct nameidata *nd,
*seqp = seq;
if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE))
status = d_revalidate(dentry, nd->flags);
if (unlikely(status <= 0)) {
if (unlazy_walk(nd, dentry, seq))
return -ECHILD;
if (status == -ECHILD)
status = d_revalidate(dentry, nd->flags);
} else {
if (likely(status > 0)) {
/*
* Note: do negative dentry check after revalidation in
* case that drops it.
@ -1574,9 +1569,12 @@ static int lookup_fast(struct nameidata *nd,
path->dentry = dentry;
if (likely(__follow_mount_rcu(nd, path, inode, seqp)))
return 1;
if (unlazy_walk(nd, dentry, seq))
return -ECHILD;
}
if (unlazy_walk(nd, dentry, seq))
return -ECHILD;
if (unlikely(status == -ECHILD))
/* we'd been told to redo it in non-rcu mode */
status = d_revalidate(dentry, nd->flags);
} else {
dentry = __d_lookup(parent, &nd->last);
if (unlikely(!dentry))