btrfs: qgroup: Introduce helpers to update and access new qgroup rsv

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Introduce helpers to:

1) Get total reserved space
   For limit calculation
2) Add/release reserved space for given type
   With underflow detection and warning
3) Add/release reserved space according to child qgroup

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

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Qu Wenruo 2017-12-12 15:34:24 +08:00 • committed by David Sterba

parent d4e5c92055

commit f59c0347d4

1 changed files with 68 additions and 0 deletions

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fs/btrfs/qgroup.c

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