xattr handlers: Pass handler to operations instead of flags

The xattr_handler operations are currently all passed a file system
specific flags value which the operations can use to disambiguate between
different handlers; some file systems use that to distinguish the xattr
namespace, for example.  In some oprations, it would be useful to also have
access to the handler prefix.  To allow that, pass a pointer to the handler
to operations instead of the flags value alone.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 22 insertions, 14 deletions

diff --git a/fs/squashfs/xattr.c b/fs/squashfs/xattr.c
index e5e0ddf..4ae1e4f 100644
--- a/fs/squashfs/xattr.c
+++ b/fs/squashfs/xattr.c
@@ -68,8 +68,8 @@ ssize_t squashfs_listxattr(struct dentry *d, char *buffer,
 		name_size = le16_to_cpu(entry.size);
 		handler = squashfs_xattr_handler(le16_to_cpu(entry.type));
 		if (handler)
-			prefix_size = handler->list(d, buffer, rest, NULL,
-				name_size, handler->flags);
+			prefix_size = handler->list(handler, d, buffer, rest,
+						    NULL, name_size);
 		if (prefix_size) {
 			if (buffer) {
 				if (prefix_size + name_size + 1 > rest) {
@@ -215,16 +215,18 @@ failed:
 /*
  * User namespace support
  */
-static size_t squashfs_user_list(struct dentry *d, char *list, size_t list_size,
-	const char *name, size_t name_len, int type)
+static size_t squashfs_user_list(const struct xattr_handler *handler,
+				 struct dentry *d, char *list, size_t list_size,
+				 const char *name, size_t name_len)
 {
 	if (list && XATTR_USER_PREFIX_LEN <= list_size)
 		memcpy(list, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
 	return XATTR_USER_PREFIX_LEN;
 }
 
-static int squashfs_user_get(struct dentry *d, const char *name, void *buffer,
-	size_t size, int type)
+static int squashfs_user_get(const struct xattr_handler *handler,
+			     struct dentry *d, const char *name, void *buffer,
+			     size_t size)
 {
 	if (name[0] == '\0')
 		return  -EINVAL;
@@ -242,8 +244,10 @@ static const struct xattr_handler squashfs_xattr_user_handler = {
 /*
  * Trusted namespace support
  */
-static size_t squashfs_trusted_list(struct dentry *d, char *list,
-	size_t list_size, const char *name, size_t name_len, int type)
+static size_t squashfs_trusted_list(const struct xattr_handler *handler,
+				    struct dentry *d, char *list,
+				    size_t list_size, const char *name,
+				    size_t name_len)
 {
 	if (!capable(CAP_SYS_ADMIN))
 		return 0;
@@ -253,8 +257,9 @@ static size_t squashfs_trusted_list(struct dentry *d, char *list,
 	return XATTR_TRUSTED_PREFIX_LEN;
 }
 
-static int squashfs_trusted_get(struct dentry *d, const char *name,
-	void *buffer, size_t size, int type)
+static int squashfs_trusted_get(const struct xattr_handler *handler,
+				struct dentry *d, const char *name,
+				void *buffer, size_t size)
 {
 	if (name[0] == '\0')
 		return  -EINVAL;
@@ -272,16 +277,19 @@ static const struct xattr_handler squashfs_xattr_trusted_handler = {
 /*
  * Security namespace support
  */
-static size_t squashfs_security_list(struct dentry *d, char *list,
-	size_t list_size, const char *name, size_t name_len, int type)
+static size_t squashfs_security_list(const struct xattr_handler *handler,
+				     struct dentry *d, char *list,
+				     size_t list_size, const char *name,
+				     size_t name_len)
 {
 	if (list && XATTR_SECURITY_PREFIX_LEN <= list_size)
 		memcpy(list, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN);
 	return XATTR_SECURITY_PREFIX_LEN;
 }
 
-static int squashfs_security_get(struct dentry *d, const char *name,
-	void *buffer, size_t size, int type)
+static int squashfs_security_get(const struct xattr_handler *handler,
+				 struct dentry *d, const char *name,
+				 void *buffer, size_t size)
 {
 	if (name[0] == '\0')
 		return  -EINVAL;