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| author | Brian Foster <bfoster@redhat.com> | 2018-08-01 17:20:31 +0300 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-08-03 09:05:13 +0300 |
| commit | 1214f1cf663b0939fbb8f1bccdc74c1d1e452d53 (patch) | |
| tree | 24a8b208cbfff610e5099eab6cdae0f474aad9df /fs/xfs/libxfs/xfs_defer.h | |
| parent | ce356d64772f920f26cd6c1b02878a737a275638 (diff) | |
| download | linux-1214f1cf663b0939fbb8f1bccdc74c1d1e452d53.tar.xz | |
xfs: replace dop_low with transaction flag
The dop_low field enables the low free space allocation mode when a
previous allocation has detected difficulty allocating blocks. It
has historically been part of the xfs_defer_ops structure, which
means if enabled, it remains enabled across a set of transactions
until the deferred operations have completed and the dfops is reset.
Now that the dfops is embedded in the transaction, we can save a bit
more space by using a transaction flag rather than a standalone
boolean. Drop the ->dop_low field and replace it with a transaction
flag that is set at the same points, carried across rolling
transactions and cleared on completion of deferred operations. This
essentially emulates the behavior of ->dop_low and so should not
change behavior.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs/libxfs/xfs_defer.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_defer.h | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/fs/xfs/libxfs/xfs_defer.h b/fs/xfs/libxfs/xfs_defer.h index d60c50498fdf..8908a2716774 100644 --- a/fs/xfs/libxfs/xfs_defer.h +++ b/fs/xfs/libxfs/xfs_defer.h @@ -25,17 +25,6 @@ struct xfs_defer_pending { /* * Header for deferred operation list. - * - * dop_low is used by the allocator to activate the lowspace algorithm - - * when free space is running low the extent allocator may choose to - * allocate an extent from an AG without leaving sufficient space for - * a btree split when inserting the new extent. In this case the allocator - * will enable the lowspace algorithm which is supposed to allow further - * allocations (such as btree splits and newroots) to allocate from - * sequential AGs. In order to avoid locking AGs out of order the lowspace - * algorithm will start searching for free space from AG 0. If the correct - * transaction reservations have been made then this algorithm will eventually - * find all the space it needs. */ enum xfs_defer_ops_type { XFS_DEFER_OPS_TYPE_BMAP, |