[v9,23/34] vfs: make getxattr retry once on an ESTALE error

Commit Message

Jeff Layton Nov. 5, 2012, 3:22 p.m. UTC

Signed-off-by: Jeff Layton <[e-mail]>
---
 fs/xattr.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

Patch

diff --git a/fs/xattr.c b/fs/xattr.c
index 5a9ddba..42284fc 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -486,12 +486,17 @@  SYSCALL_DEFINE4(getxattr, const char __user *, pathname,
 {
 	struct path path;
 	ssize_t error;
+	unsigned int try = 0;
+	unsigned int lookup_flags = LOOKUP_FOLLOW;
 
-	error = user_path(pathname, &path);
-	if (error)
-		return error;
-	error = getxattr(path.dentry, name, value, size);
-	path_put(&path);
+	do {
+		error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+		if (error)
+			break;
+		error = getxattr(path.dentry, name, value, size);
+		path_put(&path);
+		lookup_flags |= LOOKUP_REVAL;
+	} while (retry_estale(error, try++));
 	return error;
 }