ocfs2: Add trace event for trim.

Add the corresponding trace event for trim.

Signed-off-by: Tao Ma <[e-mail]>
Signed-off-by: Joel Becker <[e-mail]>

fs/ocfs2/alloc.c

···
 	discard = le64_to_cpu(gd->bg_blkno) +
 			ocfs2_clusters_to_blocks(sb, start);
 
+	trace_ocfs2_trim_extent(sb, (unsigned long long)discard, bcount);
+
 	return sb_issue_discard(sb, discard, bcount, GFP_NOFS, 0);
 }
 
···
 
 	if (le16_to_cpu(gd->bg_free_bits_count) < minbits)
 		return 0;
+
+	trace_ocfs2_trim_group((unsigned long long)le64_to_cpu(gd->bg_blkno),
+			       start, max, minbits);
 
 	while (start < max) {
 		start = ocfs2_find_next_zero_bit(bitmap, max, start);
···
 
 	if (start + len > le32_to_cpu(main_bm->i_clusters))
 		len = le32_to_cpu(main_bm->i_clusters) - start;
+
+	trace_ocfs2_trim_fs(start, len, minlen);
 
 	/* Determine first and last group to examine based on start and len */
 	first_group = ocfs2_which_cluster_group(main_bm_inode, start);

fs/ocfs2/ocfs2_trace.h

···
 		  __entry->blkno, __entry->bit)
 );
 
+TRACE_EVENT(ocfs2_trim_extent,
+	TP_PROTO(struct super_block *sb, unsigned long long blk,
+		 unsigned long long count),
+	TP_ARGS(sb, blk, count),
+	TP_STRUCT__entry(
+		__field(int, dev_major)
+		__field(int, dev_minor)
+		__field(unsigned long long, blk)
+		__field(__u64,	count)
+	),
+	TP_fast_assign(
+		__entry->dev_major = MAJOR(sb->s_dev);
+		__entry->dev_minor = MINOR(sb->s_dev);
+		__entry->blk = blk;
+		__entry->count = count;
+	),
+	TP_printk("%d %d %llu %llu",
+		  __entry->dev_major, __entry->dev_minor,
+		  __entry->blk, __entry->count)
+);
+
+DEFINE_OCFS2_ULL_UINT_UINT_UINT_EVENT(ocfs2_trim_group);
+
+DEFINE_OCFS2_ULL_ULL_ULL_EVENT(ocfs2_trim_fs);
+
 /* End of trace events for fs/ocfs2/alloc.c. */
 
 /* Trace events for fs/ocfs2/localalloc.c. */