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untangling do_lookup() - get rid of need_reval in !dentry case 

Everything arriving into if (!dentry) will have need_reval = 1.
Indeed, the only way to get there with need_reval reset to 0 would
be via
	if (unlikely(d_need_lookup(dentry)))
		goto unlazy;
	if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE)) {
		status = d_revalidate(dentry, nd);
	if (unlikely(status <= 0)) {
		if (status != -ECHILD)
			need_reval = 0;
		goto unlazy;
...
unlazy:
	/* no assignments to dentry */
	if (dentry && unlikely(d_need_lookup(dentry))) {
		dput(dentry);
		dentry = NULL;
	}
and if d_need_lookup() had already been false the first time around, it
will remain false on the second call as well.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-03-30 14:18:50 -04:00
parent acc9cb3cd4
commit 08b0ab7c20
1 changed files with 1 additions and 6 deletions
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7
fs/namei.c
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@ -1181,7 +1181,6 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
return PTR_ERR(dentry);
}
/* known good */
need_reval = 0;
status = 1;
} else if (unlikely(d_need_lookup(dentry))) {
dentry = d_inode_lookup(parent, dentry, nd);
@ -1190,10 +1189,8 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
return PTR_ERR(dentry);
}
/* known good */
need_reval = 0;
status = 1;
}
if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE) && need_reval)
} else if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE))
status = d_revalidate(dentry, nd);
if (unlikely(status <= 0)) {
if (status < 0) {
@ -1209,7 +1206,6 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
return PTR_ERR(dentry);
}
/* known good */
need_reval = 0;
status = 1;
}
}
@ -1226,7 +1222,6 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
if (!d_invalidate(dentry)) {
dput(dentry);
dentry = NULL;
need_reval = 1;
goto retry;
}
}