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btrfs-progs: tune: use the latest bdev in fs_devices for super_copy 

Currently, btrfstune relies on the superblock of the device specified
in the btrfstune argument for fs_info::super_copy. However, it should
use fs_devices::latest_bdev, as it points to the device with the highest
fs_devices::generation number. This will contain the superblock updates
that other devices may have missed and we can now support reuniting
devices following failures of btrfstune -m|M|u|U as in the patches:

   btrfs-progs: add support to fix superblock with CHANGING_FSID_V2 flag
   btrfs-progs: recover from the failed btrfstune -m|M

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2023-09-15 12:08:56 +08:00 committed by David Sterba
parent fe7bcc5d7b
commit dd718e9f6f
1 changed files with 8 additions and 0 deletions
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8
tune/main.c
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@ -355,6 +355,14 @@ int BOX_MAIN(btrfstune)(int argc, char *argv[])
goto free_out; goto free_out;
} }
/*
* For fsid changes we must use the latest device (not necessarily the
* one specified on command line so the matching of the device
* belonging to the filesystem works.
*/
if (change_metadata_uuid || random_fsid || new_fsid_str)
ctree_flags |= OPEN_CTREE_USE_LATEST_BDEV;
root = open_ctree_fd(fd, device, 0, ctree_flags); root = open_ctree_fd(fd, device, 0, ctree_flags);
if (!root) { if (!root) {