xfs: add firstblock field to xfs_trans

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A firstblock var is typically allocated and initialized along with
xfs_defer_ops structures and passed around independent from the
associated transaction. To facilitate combining the two, add an
optional ->t_firstblock field to xfs_trans that can be used in place
of an on-stack variable.

The firstblock value follows the lifetime of the transaction, so
initialize it on allocation and when a transaction rolls.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

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Brian Foster 2018-07-11 22:26:20 -07:00 • committed by Darrick J. Wong

parent 3ae2d89174

commit bba59c5e4b

2 changed files with 3 additions and 0 deletions

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fs/xfs/xfs_trans.c

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1

fs/xfs/xfs_trans.h

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