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xfs: add tracepoints to AGF/AGI read operations

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To help track down AGI/AGF lock ordering issues, I added these
tracepoints to tell us when an AGI or AGF is read and locked.  With
these we can now determine if the lock ordering goes wrong from
tracing captures.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner
2013-11-01 15:27:19 +11:00
committed by Ben Myers
parent 750b9c9066
commit d123031a56
3 changed files with 34 additions and 2 deletions
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6
fs/xfs/xfs_ialloc.c
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@@ -40,6 +40,7 @@
#include "xfs_icreate_item.h"
#include "xfs_icache.h"
#include "xfs_dinode.h"
#include "xfs_trace.h"
/*
@@ -1627,8 +1628,9 @@ xfs_read_agi(
{
int error;
ASSERT(agno != NULLAGNUMBER);
trace_xfs_read_agi(mp, agno);
ASSERT(agno != NULLAGNUMBER);
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
XFS_FSS_TO_BB(mp, 1), 0, bpp, &xfs_agi_buf_ops);
@@ -1651,6 +1653,8 @@ xfs_ialloc_read_agi(
struct xfs_perag *pag; /* per allocation group data */
int error;
trace_xfs_ialloc_read_agi(mp, agno);
error = xfs_read_agi(mp, tp, agno, bpp);
if (error)
return error;