GFS2: Add rgrp information to block_alloc trace point

This is a second attempt at a patch that adds rgrp information to the
block allocation trace point for GFS2. As suggested, the patch was
modified to list the rgrp information _after_ the fields that exist today.

Again, the reason for this patch is to allow us to trace and debug
problems with the block reservations patch, which is still in the works.
We can debug problems with reservations if we can see what block allocations
result from the block reservations. It may also be handy in figuring out
if there are problems in rgrp free space accounting. In other words,
we can use it to track the rgrp and its free space along side the allocations
that are taking place.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 11 insertions, 5 deletions

diff --git a/fs/gfs2/trace_gfs2.h b/fs/gfs2/trace_gfs2.h
index dfa89cd75534..1b8b81588199 100644
--- a/fs/gfs2/trace_gfs2.h
+++ b/fs/gfs2/trace_gfs2.h
@@ -457,10 +457,10 @@ TRACE_EVENT(gfs2_bmap,
 /* Keep track of blocks as they are allocated/freed */
 TRACE_EVENT(gfs2_block_alloc,
 
-        TP_PROTO(const struct gfs2_inode *ip, u64 block, unsigned len,
-                u8 block_state),
+        TP_PROTO(const struct gfs2_inode *ip, struct gfs2_rgrpd *rgd,
+                 u64 block, unsigned len, u8 block_state),
 
-        TP_ARGS(ip, block, len, block_state),
+        TP_ARGS(ip, rgd, block, len, block_state),
 
         TP_STRUCT__entry(
                 __field(        dev_t,  dev                     )
@@ -468,6 +468,8 @@ TRACE_EVENT(gfs2_block_alloc,
                 __field(        u64,    inum                    )
                 __field(        u32,    len                     )
                 __field(        u8,     block_state             )
+                __field(        u64,    rd_addr                 )
+                __field(        u32,    rd_free_clone           )
         ),
 
         TP_fast_assign(
@@ -476,14 +478,18 @@ TRACE_EVENT(gfs2_block_alloc,
                 __entry->inum           = ip->i_no_addr;
                 __entry->len            = len;
                 __entry->block_state    = block_state;
+                __entry->rd_addr        = rgd->rd_addr;
+                __entry->rd_free_clone  = rgd->rd_free_clone;
         ),
 
-        TP_printk("%u,%u bmap %llu alloc %llu/%lu %s",
+        TP_printk("%u,%u bmap %llu alloc %llu/%lu %s rg:%llu rf:%u",
                   MAJOR(__entry->dev), MINOR(__entry->dev),
                   (unsigned long long)__entry->inum,
                   (unsigned long long)__entry->start,
                   (unsigned long)__entry->len,
-                  block_state_name(__entry->block_state))
+                  block_state_name(__entry->block_state),
+                  (unsigned long long)__entry->rd_addr,
+                  __entry->rd_free_clone)
 );
 
 #endif /* _TRACE_GFS2_H */