Commit 19f93b3c authored by David Sterba's avatar David Sterba
Browse files

btrfs: add helpers for FS_XFLAG_* conversion 



Preparatory work for the FS_IOC_FSGETXATTR ioctl, basic conversions and
checking helpers.

Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent a157d4fd

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);