From 32d48fa1af1fe066a6a4798e6f5a50ac6a3ce4a3 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Mon, 18 Aug 2008 13:10:20 +0100 Subject: [PATCH] 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: David Woodhouse Signed-off-by: Chris Mason --- fs/btrfs/super.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 6446ab73f35a..55f4d00fda3a 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -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; } -- GitLab