[XFS] add new btree statistics

From: Dave Chinner <dgc@sgi.com>

Introduce statistics coverage of all the btrees and cover all the btree
operations, not just some.

Invaluable for determining test code coverage of all the btree
operations....

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32184a

Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Bill O'Donnell <billodo@sgi.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index a57918276d9f..57d3bd37526e 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -121,6 +121,34 @@ union xfs_btree_rec {
 extern const __uint32_t xfs_magics[];
 
 /*
+ * Generic stats interface
+ */
+#define __XFS_BTREE_STATS_INC(type, stat) \
+        XFS_STATS_INC(xs_ ## type ## _2_ ## stat)
+#define XFS_BTREE_STATS_INC(cur, stat)  \
+do {    \
+        switch (cur->bc_btnum) {  \
+        case XFS_BTNUM_BNO: __XFS_BTREE_STATS_INC(abtb, stat); break;   \
+        case XFS_BTNUM_CNT: __XFS_BTREE_STATS_INC(abtc, stat); break;   \
+        case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_INC(bmbt, stat); break;  \
+        case XFS_BTNUM_INO: __XFS_BTREE_STATS_INC(ibt, stat); break;    \
+        case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break;       \
+        }       \
+} while (0)
+
+#define __XFS_BTREE_STATS_ADD(type, stat, val) \
+        XFS_STATS_ADD(xs_ ## type ## _2_ ## stat, val)
+#define XFS_BTREE_STATS_ADD(cur, stat, val)  \
+do {    \
+        switch (cur->bc_btnum) {  \
+        case XFS_BTNUM_BNO: __XFS_BTREE_STATS_ADD(abtb, stat, val); break; \
+        case XFS_BTNUM_CNT: __XFS_BTREE_STATS_ADD(abtc, stat, val); break; \
+        case XFS_BTNUM_BMAP: __XFS_BTREE_STATS_ADD(bmbt, stat, val); break; \
+        case XFS_BTNUM_INO: __XFS_BTREE_STATS_ADD(ibt, stat, val); break; \
+        case XFS_BTNUM_MAX: ASSERT(0); /* fucking gcc */ ; break;       \
+        }       \
+} while (0)
+/*
  * Maximum and minimum records in a btree block.
  * Given block size, type prefix, and leaf flag (0 or 1).
  * The divisor below is equivalent to lf ? (e1) : (e2) but that produces