ovl: Use macros to present ovl_xattr
This patch adds two macros:
OVL_XATTR_PRE_NAME and OVL_XATTR_PRE_LEN
to present ovl_xattr name prefix and its length. Also, a
new macro OVL_XATTR_OPAQUE is introduced to replace old
*ovl_opaque_xattr*.
Fix the length of "trusted.overlay." to *16*.
Signed-off-by: hujianyang <hujianyang@huawei.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index dcae3ac..0dc4c33 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -118,14 +118,14 @@
static int ovl_set_opaque(struct dentry *upperdentry)
{
- return ovl_do_setxattr(upperdentry, ovl_opaque_xattr, "y", 1, 0);
+ return ovl_do_setxattr(upperdentry, OVL_XATTR_OPAQUE, "y", 1, 0);
}
static void ovl_remove_opaque(struct dentry *upperdentry)
{
int err;
- err = ovl_do_removexattr(upperdentry, ovl_opaque_xattr);
+ err = ovl_do_removexattr(upperdentry, OVL_XATTR_OPAQUE);
if (err) {
pr_warn("overlayfs: failed to remove opaque from '%s' (%i)\n",
upperdentry->d_name.name, err);
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 5ac1236..04f1248 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -205,7 +205,7 @@
static bool ovl_is_private_xattr(const char *name)
{
- return strncmp(name, "trusted.overlay.", 14) == 0;
+ return strncmp(name, OVL_XATTR_PRE_NAME, OVL_XATTR_PRE_LEN) == 0;
}
int ovl_setxattr(struct dentry *dentry, const char *name,
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index d176b67..17ac5af 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -23,7 +23,9 @@
#define OVL_TYPE_MERGE_OR_LOWER(type) \
(OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type))
-extern const char *ovl_opaque_xattr;
+#define OVL_XATTR_PRE_NAME "trusted.overlay."
+#define OVL_XATTR_PRE_LEN 16
+#define OVL_XATTR_OPAQUE OVL_XATTR_PRE_NAME"opaque"
static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
{
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index e9ce4a9..84f3144 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -62,8 +62,6 @@
#define OVL_MAX_STACK 500
-const char *ovl_opaque_xattr = "trusted.overlay.opaque";
-
static struct dentry *__ovl_dentry_lower(struct ovl_entry *oe)
{
return oe->numlower ? oe->lowerstack[0].dentry : NULL;
@@ -254,7 +252,7 @@
if (!S_ISDIR(inode->i_mode) || !inode->i_op->getxattr)
return false;
- res = inode->i_op->getxattr(dentry, ovl_opaque_xattr, &val, 1);
+ res = inode->i_op->getxattr(dentry, OVL_XATTR_OPAQUE, &val, 1);
if (res == 1 && val == 'y')
return true;