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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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10
fs/xfs/linux-2.6/xfs_trace.h
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@@ -786,10 +786,12 @@ DECLARE_EVENT_CLASS(xfs_loggrant_class,
__entry->flags = tic->t_flags;
__entry->reserveq = list_empty(&log->l_reserveq);
__entry->writeq = list_empty(&log->l_writeq);
__entry->grant_reserve_cycle = log->l_grant_reserve_cycle;
__entry->grant_reserve_bytes = log->l_grant_reserve_bytes;
__entry->grant_write_cycle = log->l_grant_write_cycle;
__entry->grant_write_bytes = log->l_grant_write_bytes;
xlog_crack_grant_head(&log->l_grant_reserve_head,
&__entry->grant_reserve_cycle,
&__entry->grant_reserve_bytes);
xlog_crack_grant_head(&log->l_grant_write_head,
&__entry->grant_write_cycle,
&__entry->grant_write_bytes);
__entry->curr_cycle = log->l_curr_cycle;
__entry->curr_block = log->l_curr_block;
__entry->tail_lsn = log->l_tail_lsn;