btrfs: warn when remount will not change the free space tree

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If the remount is ro->ro, rw->ro, or rw->rw, we will not create or
clear the free space tree. This can be surprising, so print a warning
to dmesg to make the failure more visible. It is also important to
ensure that the space cache options (SPACE_CACHE, FREE_SPACE_TREE) are
consistent, so ensure those are set to properly match the current on
disk state (which won't be changing).

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Boris Burkov 2020-11-18 15:06:24 -08:00 • committed by David Sterba

parent 04c4155969

commit 2838d255cb

1 changed files with 16 additions and 0 deletions

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fs/btrfs/super.c

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