btrfs: qgroup: Add function qgroup_update_refcnt().

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This function is used to update refcnt for qgroups.
And is one of the two core functions used in the new qgroup implement.

This is based on the old update_old/new_refcnt, but provides a unified
logic and behavior.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>

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Qu Wenruo 2015-04-12 16:52:34 +08:00 • committed by Chris Mason

parent c682f9b3c2

commit d810ef2be5

1 changed files with 58 additions and 0 deletions

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fs/btrfs/qgroup.c

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