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btrfs: add support for SUPER_FLAG_CHANGING_FSID 

The UUID change by btrfstune sets SUPER_FLAG_CHANGING_FSID and resets it
only when changing fsid is complete. Its not a good idea to mount the
device anything in between, reading metadata blocks would fail with UUID
mismatch.

This patch doesn't add SUPER_FLAG_CHANGING_FSID into
BTRFS_SUPER_FLAG_SUPP list, so mount will fail (along with the fix in
the next patch) when SUPER_FLAG_CHANGING_FSID is set.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update changelog ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2018-01-09 09:05:42 +08:00 committed by David Sterba
parent e2731e5588
commit 98820a7e24
1 changed files with 1 additions and 0 deletions
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1
include/uapi/linux/btrfs_tree.h
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@ -457,6 +457,7 @@ struct btrfs_free_space_header {
#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
#define BTRFS_SUPER_FLAG_METADUMP_V2 (1ULL << 34)
#define BTRFS_SUPER_FLAG_CHANGING_FSID (1ULL << 35)
/*