Fix the -ESTALE handling in do_filp_open()
Instead of playing sick games with path saving, cleanups, just retry
the entire thing once with LOOKUP_REVAL added. Post-.34 we'll convert
all -ESTALE handling in there to that style, rather than playing with
many retry loops deep in the call chain.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namei.c b/fs/namei.c
index d930f18..94a5e60 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1604,11 +1604,12 @@
struct file *filp;
struct nameidata nd;
int error;
- struct path path, save;
+ struct path path;
struct dentry *dir;
int count = 0;
int will_truncate;
int flag = open_to_namei_flags(open_flag);
+ int force_reval = 0;
/*
* O_SYNC is implemented as __O_SYNC|O_DSYNC. As many places only
@@ -1660,9 +1661,12 @@
/*
* Create - we need to know the parent.
*/
+reval:
error = path_init(dfd, pathname, LOOKUP_PARENT, &nd);
if (error)
return ERR_PTR(error);
+ if (force_reval)
+ nd.flags |= LOOKUP_REVAL;
error = path_walk(pathname, &nd);
if (error) {
if (nd.root.mnt)
@@ -1854,17 +1858,7 @@
error = security_inode_follow_link(path.dentry, &nd);
if (error)
goto exit_dput;
- save = nd.path;
- path_get(&save);
error = __do_follow_link(&path, &nd);
- if (error == -ESTALE) {
- /* nd.path had been dropped */
- nd.path = save;
- path_get(&nd.path);
- nd.flags |= LOOKUP_REVAL;
- error = __do_follow_link(&path, &nd);
- }
- path_put(&save);
path_put(&path);
if (error) {
/* Does someone understand code flow here? Or it is only
@@ -1874,6 +1868,10 @@
release_open_intent(&nd);
if (nd.root.mnt)
path_put(&nd.root);
+ if (error == -ESTALE && !force_reval) {
+ force_reval = 1;
+ goto reval;
+ }
return ERR_PTR(error);
}
nd.flags &= ~LOOKUP_PARENT;