From d123031a5673cd38a85ce66cc07243dfe5f424c9 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Fri, 1 Nov 2013 15:27:19 +1100 Subject: [PATCH] xfs: add tracepoints to AGF/AGI read operations 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 Reviewed-by: Christoph Hellwig Signed-off-by: Ben Myers --- fs/xfs/xfs_alloc.c | 5 ++++- fs/xfs/xfs_ialloc.c | 6 +++++- fs/xfs/xfs_trace.h | 25 +++++++++++++++++++++++++ 3 files changed, 34 insertions(+), 2 deletions(-) diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c index bcf16528bac5..9eab2dfdcbb5 100644 --- a/fs/xfs/xfs_alloc.c +++ b/fs/xfs/xfs_alloc.c @@ -2294,6 +2294,8 @@ xfs_read_agf( { int error; + trace_xfs_read_agf(mp, agno); + ASSERT(agno != NULLAGNUMBER); error = xfs_trans_read_buf( mp, tp, mp->m_ddev_targp, @@ -2324,8 +2326,9 @@ xfs_alloc_read_agf( struct xfs_perag *pag; /* per allocation group data */ int error; - ASSERT(agno != NULLAGNUMBER); + trace_xfs_alloc_read_agf(mp, agno); + ASSERT(agno != NULLAGNUMBER); error = xfs_read_agf(mp, tp, agno, (flags & XFS_ALLOC_FLAG_TRYLOCK) ? XBF_TRYLOCK : 0, bpp); diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c index 14d732f61a41..e87719c5bebe 100644 --- a/fs/xfs/xfs_ialloc.c +++ b/fs/xfs/xfs_ialloc.c @@ -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; diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index f195476a037c..425dfa45b9a0 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -135,6 +135,31 @@ DEFINE_PERAG_REF_EVENT(xfs_perag_clear_reclaim); DEFINE_PERAG_REF_EVENT(xfs_perag_set_eofblocks); DEFINE_PERAG_REF_EVENT(xfs_perag_clear_eofblocks); +DECLARE_EVENT_CLASS(xfs_ag_class, + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno), + TP_ARGS(mp, agno), + TP_STRUCT__entry( + __field(dev_t, dev) + __field(xfs_agnumber_t, agno) + ), + TP_fast_assign( + __entry->dev = mp->m_super->s_dev; + __entry->agno = agno; + ), + TP_printk("dev %d:%d agno %u", + MAJOR(__entry->dev), MINOR(__entry->dev), + __entry->agno) +); +#define DEFINE_AG_EVENT(name) \ +DEFINE_EVENT(xfs_ag_class, name, \ + TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno), \ + TP_ARGS(mp, agno)) + +DEFINE_AG_EVENT(xfs_read_agf); +DEFINE_AG_EVENT(xfs_alloc_read_agf); +DEFINE_AG_EVENT(xfs_read_agi); +DEFINE_AG_EVENT(xfs_ialloc_read_agi); + TRACE_EVENT(xfs_attr_list_node_descend, TP_PROTO(struct xfs_attr_list_context *ctx, struct xfs_da_node_entry *btree), -- 2.39.5