[PATCH 11/12] reiserfs: drop posix acl handlers

[Christian Brauner <brauner@kernel.org>]

Last cycle we introduced a new posix acl api. Filesystems now only need
to implement the inode operations for posix acls. The generic xattr
handlers aren't used anymore by the vfs and will be completely removed.
Keeping the handler around is confusing and gives the false impression
that the xattr infrastructure of the vfs is used to interact with posix
acls when it really isn't anymore.

For this to work we simply rework the ->listxattr() inode operation to
not rely on the generix posix acl handlers anymore.

Cc: <reiserfs-devel@vger.kernel.org>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
---
 fs/reiserfs/xattr.c | 38 +++++++++++++++++---------------------
 1 file changed, 17 insertions(+), 21 deletions(-)

diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 8b2d52443f41..cc6f42128031 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -52,6 +52,7 @@
 #include <linux/quotaops.h>
 #include <linux/security.h>
 #include <linux/posix_acl_xattr.h>
+#include <linux/xattr.h>
 
 #define PRIVROOT_NAME ".reiserfs_priv"
 #define XAROOT_NAME   "xattrs"
@@ -771,22 +772,26 @@ reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
 			(handler) = *(handlers)++)
 
 /* This is the implementation for the xattr plugin infrastructure */
-static inline const struct xattr_handler *
-find_xattr_handler_prefix(const struct xattr_handler **handlers,
-			   const char *name)
+static inline bool reiserfs_xattr_list(const struct xattr_handler **handlers,
+				       const char *name, struct dentry *dentry)
 {
-	const struct xattr_handler *xah;
+	const struct xattr_handler *xah = NULL;
 
-	if (!handlers)
-		return NULL;
+	if (handlers) {
+		for_each_xattr_handler(handlers, xah) {
+			const char *prefix = xattr_prefix(xah);
 
-	for_each_xattr_handler(handlers, xah) {
-		const char *prefix = xattr_prefix(xah);
-		if (strncmp(prefix, name, strlen(prefix)) == 0)
-			break;
+			if (strncmp(prefix, name, strlen(prefix)))
+				continue;
+
+			if (!xattr_dentry_list(xah, dentry))
+				return false;
+
+			return true;
+		}
 	}
 
-	return xah;
+	return (posix_acl_type(name) >= 0) && posix_acl_dentry_list(dentry);
 }
 
 struct listxattr_buf {
@@ -807,12 +812,7 @@ static bool listxattr_filler(struct dir_context *ctx, const char *name,
 
 	if (name[0] != '.' ||
 	    (namelen != 1 && (name[1] != '.' || namelen != 2))) {
-		const struct xattr_handler *handler;
-
-		handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
-						    name);
-		if (!handler /* Unsupported xattr name */ ||
-		    (handler->list && !handler->list(b->dentry)))
+		if (!reiserfs_xattr_list(b->dentry->d_sb->s_xattr, name, b->dentry))
 			return true;
 		size = namelen + 1;
 		if (b->buf) {
@@ -910,10 +910,6 @@ const struct xattr_handler *reiserfs_xattr_handlers[] = {
 #endif
 #ifdef CONFIG_REISERFS_FS_SECURITY
 	&reiserfs_xattr_security_handler,
-#endif
-#ifdef CONFIG_REISERFS_FS_POSIX_ACL
-	&posix_acl_access_xattr_handler,
-	&posix_acl_default_xattr_handler,
 #endif
 	NULL
 };

-- 
2.34.1