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xfs: combine grant heads into a single 64 bit integer

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Prepare for switching the grant heads to atomic variables by
combining the two 32 bit values that make up the grant head into a
single 64 bit variable.  Provide wrapper functions to combine and
split the grant heads appropriately for calculations and use them as
necessary.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner
2010-12-21 12:08:20 +11:00
committed by Dave Chinner
parent 663e496a72
commit a69ed03c24
4 changed files with 119 additions and 91 deletions
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8
fs/xfs/xfs_log_recover.c
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@ -938,10 +938,10 @@ xlog_find_tail(
log->l_curr_cycle++;
log->l_tail_lsn = be64_to_cpu(rhead->h_tail_lsn);
log->l_last_sync_lsn = be64_to_cpu(rhead->h_lsn);
log->l_grant_reserve_cycle = log->l_curr_cycle;
log->l_grant_reserve_bytes = BBTOB(log->l_curr_block);
log->l_grant_write_cycle = log->l_curr_cycle;
log->l_grant_write_bytes = BBTOB(log->l_curr_block);
xlog_assign_grant_head(&log->l_grant_reserve_head, log->l_curr_cycle,
BBTOB(log->l_curr_block));
xlog_assign_grant_head(&log->l_grant_write_head, log->l_curr_cycle,
BBTOB(log->l_curr_block));
/*
* Look for unmount record. If we find it, then we know there