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namei: lift (open-coded) terminate_walk() in follow_dotdot_rcu() into callers 

follow_dotdot_rcu() does an equivalent of terminate_walk() on failure;
shifting it into callers makes for simpler rules and those callers
already have terminate_walk() on other failure exits.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-05-04 07:53:00 -04:00
parent e269f2a73f
commit 70291aecc6
1 changed files with 10 additions and 9 deletions
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19
fs/namei.c
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@ -1230,10 +1230,6 @@ static int follow_dotdot_rcu(struct nameidata *nd)
return 0;
failed:
nd->flags &= ~LOOKUP_RCU;
if (!(nd->flags & LOOKUP_ROOT))
nd->root.mnt = NULL;
rcu_read_unlock();
return -ECHILD;
}
@ -1551,8 +1547,7 @@ static inline int handle_dots(struct nameidata *nd, int type)
{
if (type == LAST_DOTDOT) {
if (nd->flags & LOOKUP_RCU) {
if (follow_dotdot_rcu(nd))
return -ECHILD;
return follow_dotdot_rcu(nd);
} else
follow_dotdot(nd);
}
@ -1592,8 +1587,12 @@ static int walk_component(struct nameidata *nd, int follow)
* to be able to know about the current root directory and
* parent relationships.
*/
if (unlikely(nd->last_type != LAST_NORM))
return handle_dots(nd, nd->last_type);
if (unlikely(nd->last_type != LAST_NORM)) {
err = handle_dots(nd, nd->last_type);
if (err)
goto out_err;
return 0;
}
err = lookup_fast(nd, &path, &inode);
if (unlikely(err)) {
if (err < 0)
@ -2981,8 +2980,10 @@ static int do_last(struct nameidata *nd,
if (nd->last_type != LAST_NORM) {
error = handle_dots(nd, nd->last_type);
if (error)
if (unlikely(error)) {
terminate_walk(nd);
return error;
}
goto finish_open;
}