btrfs: catch cow on deleting snapshots

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When debugging some weird extent reference bug I suspected that we were
changing a snapshot while we were deleting it, which could explain my
bug.  This was indeed what was happening, and this patch helped me
verify my theory.  It is never correct to modify the snapshot once it's
being deleted, so mark the root when we are deleting it and make sure we
complain about it when it happens.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Josef Bacik 2018-11-30 11:52:13 -05:00 • committed by David Sterba

parent 01e0da4885

commit 83354f0772

3 changed files with 14 additions and 0 deletions

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4

fs/btrfs/ctree.c

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1

fs/btrfs/ctree.h

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9

fs/btrfs/extent-tree.c

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