xattr: add a function to check if a namespace is supported (cab8d289) · Commits · 戴 / test

fs/xattr.c

+27 −0

Original line number	Diff line number	Diff line
		@@ -134,6 +134,33 @@ xattr_permission(struct inode inode, const char name, int mask)
		return inode_permission(inode, mask);
		}

		/*
		* Look for any handler that deals with the specified namespace.
		*/
		int
		xattr_supported_namespace(struct inode inode, const char prefix)
		{
		const struct xattr_handler **handlers = inode->i_sb->s_xattr;
		const struct xattr_handler *handler;
		size_t preflen;

		if (!(inode->i_opflags & IOP_XATTR)) {
		if (unlikely(is_bad_inode(inode)))
		return -EIO;
		return -EOPNOTSUPP;
		}

		preflen = strlen(prefix);

		for_each_xattr_handler(handlers, handler) {
		if (!strncmp(xattr_prefix(handler), prefix, preflen))
		return 0;
		}

		return -EOPNOTSUPP;
		}
		EXPORT_SYMBOL(xattr_supported_namespace);

		int
		__vfs_setxattr(struct dentry dentry, struct inode inode, const char *name,
		const void *value, size_t size, int flags)

+2 −0

Original line number	Diff line number	Diff line
		@@ -61,6 +61,8 @@ ssize_t generic_listxattr(struct dentry dentry, char buffer, size_t buffer_siz
		ssize_t vfs_getxattr_alloc(struct dentry dentry, const char name,
		char **xattr_value, size_t size, gfp_t flags);

		int xattr_supported_namespace(struct inode inode, const char prefix);

		static inline const char xattr_prefix(const struct xattr_handler handler)
		{
		return handler->prefix ?: handler->name;