Currently, to fix device following the write failure of one or more devices
during btrfstune -m|M, we rely on the kernel's ability to reassemble devices,
even when they possess distinct fsids.
Kernel hinges combinations of metadata_uuid and generation number, with
additional cues taken from the fsid and the BTRFS_SUPER_FLAG_CHANGING_FSID_V2
flag. This patch adds this logic to btrfs-progs.
In complex scenarios (such as multiple fsids with the same metadata_uuid and
matching generation), user intervention becomes necessary to resolve the
situations which btrfs-progs can do better.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
In the function set_metadata_uuid(), we set the flag
BTRFS_SUPER_FLAG_CHANGING_FSID_V2 in step 1 at line 71 as shown below:
71 super_flags |= BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
72 btrfs_set_super_flags(disk_super, super_flags);
73 ret = btrfs_commit_transaction(trans, root);
However, we fail to reset this flag if there is no change in the fsid on
the incoming disks, as we return too early.
105 } else {
106 /* Setting the same fsid as current, do nothing */
107 return 0;
Fix this by allowing the thread to pass through the step 2, where we
reset the flag.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
In preparation to use check_unfinished_fsid_change() to support the
ability to reunite devices after a failed 'btrfstune -m|M' command,
rename %unused2 to %metadata_uuid as the function
check_unfinished_fsid_change() write the metadata_uuid from the ctree to
it.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
In preparation to use check_unfinished_fsid_change() to support the
ability to reunite devices after a failed 'btrfstune -m|M' command,
delete unused1 argument instead reuse %fsid as the function
check_unfinished_fsid_change() returns the fsid.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
We never change the metadata_uuid; we only change the fsid. So
'%fsid_changed' flows more appropriately than '%uuid_changed'.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
%new_uuid is being used to say there is a new fsid. So why not just call
it %new_fsid.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
The %new_fsid is not only new it can be the fsid from the passed disk
so just rename it to %fsid. Also, in the next patch the %new_fsid will
be a bool variable to indicate if the %fsid is new from the fsid in the
disk.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
In preparation to use check_unfinished_fsid_change() to support the
ability to reunite devices after a failed 'btrfstune -m|M' command,
%uuid_string arg is actually carries new fsid to be used. So just name
it to %new_fsid_str.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
We want to keep this file locally as we want to be uptodate with
upstream, so we can build btrfs-progs regardless of which kernel is
currently installed. Sync this with the upstream version and put it in
kernel-shared/uapi to maintain some semblance of where this file comes
from.
There are some changes that need to be synced back to kernel. A local
definition of static_assert is used to avoid compilation problems on gcc
(< 9) due to mandatory 2nd parameter.
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
The conversion have been copy&pasted from one code but not all messages
reflect that and mistakenly say fsid instead of csum, etc. Also rename
functions converting the trees to more descriptive names.
Signed-off-by: David Sterba <dsterba@suse.com>
