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authorJeff Layton <jlayton@redhat.com>2012-12-20 14:59:40 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2012-12-20 18:50:00 -0500
commitb9d6ba94b875192ef5e2dab92d72beea33b83c3d (patch)
treea06e604535e10ec0c469300f0d36cb5aa8c2782d
parent21e89c0c48bb799beb09181740796fc80c9676e2 (diff)
downloadvexpress-lsk-b9d6ba94b875192ef5e2dab92d72beea33b83c3d.tar.gz
vfs: add a retry_estale helper function to handle retries on ESTALE
This function is expected to be called from path-based syscalls to help them decide whether to try the lookup and call again in the event that they got an -ESTALE return back on an earier try. Currently, we only retry the call once on an ESTALE error, but in the event that we decide that that's not enough in the future, we should be able to change the logic in this helper without too much effort. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--include/linux/namei.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 4bf19d8174e..66542b64480 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -98,4 +98,20 @@ static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
((char *) name)[min(len, maxlen)] = '\0';
}
+/**
+ * retry_estale - determine whether the caller should retry an operation
+ * @error: the error that would currently be returned
+ * @flags: flags being used for next lookup attempt
+ *
+ * Check to see if the error code was -ESTALE, and then determine whether
+ * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
+ *
+ * Returns true if the caller should try the operation again.
+ */
+static inline bool
+retry_estale(const long error, const unsigned int flags)
+{
+ return error == -ESTALE && !(flags & LOOKUP_REVAL);
+}
+
#endif /* _LINUX_NAMEI_H */