xfs: introduce xfs_ag_shrink_space()

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This patch introduces a helper to shrink unused space in the last AG
by fixing up the freespace btree.

Also make sure that the per-AG reservation works under the new AG
size. If such per-AG reservation or extent allocation fails, roll
the transaction so the new transaction could cancel without any side
effects.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

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Gao Xiang 2021-03-23 19:05:38 -07:00 • committed by Darrick J. Wong

parent c789c83c7e

commit 46141dc891

2 changed files with 117 additions and 0 deletions

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115

fs/xfs/libxfs/xfs_ag.c

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2

fs/xfs/libxfs/xfs_ag.h

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