btrfs: add helpers for FS_XFLAG_* conversion (19f93b3c) · Commits · 戴 / test

fs/btrfs/ioctl.c

+32 −0

Original line number	Diff line number	Diff line
		@@ -338,6 +338,38 @@ static int btrfs_ioctl_setflags(struct file file, void __user arg)
		return ret;
		}

		/*
		* Translate btrfs internal inode flags to xflags as expected by the
		* FS_IOC_FSGETXATT ioctl. Filter only the supported ones, unknown flags are
		* silently dropped.
		*/
		static unsigned int btrfs_inode_flags_to_xflags(unsigned int flags)
		{
		unsigned int xflags = 0;

		if (flags & BTRFS_INODE_APPEND)
		xflags \|= FS_XFLAG_APPEND;
		if (flags & BTRFS_INODE_IMMUTABLE)
		xflags \|= FS_XFLAG_IMMUTABLE;
		if (flags & BTRFS_INODE_NOATIME)
		xflags \|= FS_XFLAG_NOATIME;
		if (flags & BTRFS_INODE_NODUMP)
		xflags \|= FS_XFLAG_NODUMP;
		if (flags & BTRFS_INODE_SYNC)
		xflags \|= FS_XFLAG_SYNC;

		return xflags;
		}

		/* Check if @flags are a supported and valid set of FS_XFLAGS_* flags */
		static int check_xflags(unsigned int flags)
		{
		if (flags & ~(FS_XFLAG_APPEND \| FS_XFLAG_IMMUTABLE \| FS_XFLAG_NOATIME \|
		FS_XFLAG_NODUMP \| FS_XFLAG_SYNC))
		return -EOPNOTSUPP;
		return 0;
		}

		static int btrfs_ioctl_getversion(struct file file, int __user arg)
		{
		struct inode *inode = file_inode(file);