[PATCH v1 12/12] vfs: fix renameat to retry on ESTALE errors

[Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

...as always, rename is the messiest of the bunch...

Signed-off-by: Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 fs/namei.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index 0d54eb3..1db2814 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3274,12 +3274,15 @@ SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
 	char *from;
 	char *to;
 	int error;
+	unsigned int try = 0;
+	bool should_retry = false;
 
-	error = user_path_parent(olddfd, oldname, &oldnd, &from, false);
+retry:
+	error = user_path_parent(olddfd, oldname, &oldnd, &from, try);
 	if (error)
 		goto exit;
 
-	error = user_path_parent(newdfd, newname, &newnd, &to, false);
+	error = user_path_parent(newdfd, newname, &newnd, &to, try);
 	if (error)
 		goto exit1;
 
@@ -3348,12 +3351,18 @@ exit4:
 	dput(old_dentry);
 exit3:
 	unlock_rename(new_dir, old_dir);
+	if (retry_estale(error, try++))
+		should_retry = true;
 exit2:
 	path_put(&newnd.path);
 	putname(to);
 exit1:
 	path_put(&oldnd.path);
 	putname(from);
+	if (should_retry) {
+		should_retry = false;
+		goto retry;
+	}
 exit:
 	return error;
 }
-- 
1.7.7.6

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