btrfs: introduce BTRFS_QGROUP_RUNTIME_FLAG_CANCEL_RESCAN

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Introduce a new runtime flag, BTRFS_QGROUP_RUNTIME_FLAG_CANCEL_RESCAN,
which will inform qgroup rescan to cancel its work asynchronously.

This is to address the window when an operation makes qgroup numbers
inconsistent (like qgroup inheriting) while a qgroup rescan is running.

In that case, qgroup inconsistent flag will be cleared when qgroup
rescan finishes.
But we changed the ownership of some extents, which means the rescan is
already meaningless, and the qgroup inconsistent flag should not be
cleared.

With the new flag, each time we set INCONSISTENT flag, we also set this
new flag to inform any running qgroup rescan to exit immediately, and
leaving the INCONSISTENT flag there.

The new runtime flag can only be cleared when a new rescan is started.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

Qu Wenruo 2022-08-24 09:14:07 +08:00 • committed by David Sterba

parent e71564c043

commit e562a8bdf6

2 changed files with 28 additions and 17 deletions

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43

fs/btrfs/qgroup.c

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2

fs/btrfs/qgroup.h

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