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Commit 32d48fa1 authored by David Woodhouse's avatar David Woodhouse Committed by Chris Mason
Browse files

Mask root object ID into f_fsid in btrfs_statfs() 



Date: Mon, 18 Aug 2008 13:10:20 +0100
This means that subvolumes get a different fsid, and NFS exporting them
works properly.

Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 9d03632e

fs/btrfs/super.c

+4 −0
Original line number Diff line number Diff line
@@ -503,6 +503,10 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf) 
	   on a big-endian or little-endian host */

	buf->f_fsid.val[0] = be32_to_cpu(fsid[0]) ^ be32_to_cpu(fsid[2]);

	buf->f_fsid.val[1] = be32_to_cpu(fsid[1]) ^ be32_to_cpu(fsid[3]);

	/* Mask in the root object ID too, to disambiguate subvols */

	buf->f_fsid.val[0] ^= BTRFS_I(dentry->d_inode)->root->objectid >> 32;

	buf->f_fsid.val[1] ^= BTRFS_I(dentry->d_inode)->root->objectid;



	return 0;

}