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xfs: Add trace points for per-ag refcount debugging.

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Uninline xfs_perag_{get,put} so that tracepoints can be inserted
into them to speed debugging of reference count problems.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-01-11 11:47:46 +00:00 • committed by Alex Elder
parent aed3bb90ab
commit 0fa800fbd5
4 changed files with 65 additions and 23 deletions
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34
fs/xfs/xfs_mount.c
View file

@ -200,6 +200,38 @@ xfs_uuid_unmount(
}
/*
* Reference counting access wrappers to the perag structures.
*/
struct xfs_perag *
xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno)
{
struct xfs_perag *pag;
int ref = 0;
spin_lock(&mp->m_perag_lock);
pag = radix_tree_lookup(&mp->m_perag_tree, agno);
if (pag) {
ASSERT(atomic_read(&pag->pag_ref) >= 0);
/* catch leaks in the positive direction during testing */
ASSERT(atomic_read(&pag->pag_ref) < 1000);
ref = atomic_inc_return(&pag->pag_ref);
}
spin_unlock(&mp->m_perag_lock);
trace_xfs_perag_get(mp, agno, ref, _RET_IP_);
return pag;
}
void
xfs_perag_put(struct xfs_perag *pag)
{
int ref;
ASSERT(atomic_read(&pag->pag_ref) > 0);
ref = atomic_dec_return(&pag->pag_ref);
trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_);
}
/*
* Free up the resources associated with a mount structure. Assume that
* the structure was initially zeroed, so we can tell which fields got
@ -433,6 +465,8 @@ xfs_initialize_perag(
kmem_free(pag);
return -EEXIST;
}
pag->pag_agno = index;
pag->pag_mount = mp;
spin_unlock(&mp->m_perag_lock);
radix_tree_preload_end();
}