2 files changed, 27 insertions, 0 deletions

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 0a530853b53d..8f8aaee7f379 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -518,6 +518,9 @@ check_writeio:
         if (alloc_blocks < mp->m_writeio_blocks)
                 alloc_blocks = mp->m_writeio_blocks;
 
+        trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift,
+                                      mp->m_writeio_blocks);
+
         return alloc_blocks;
 }
 
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 16a812977eab..aa4db3307d36 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -619,6 +619,30 @@ DECLARE_EVENT_CLASS(xfs_iref_class,
                   (char *)__entry->caller_ip)
 )
 
+TRACE_EVENT(xfs_iomap_prealloc_size,
+        TP_PROTO(struct xfs_inode *ip, xfs_fsblock_t blocks, int shift,
+                 unsigned int writeio_blocks),
+        TP_ARGS(ip, blocks, shift, writeio_blocks),
+        TP_STRUCT__entry(
+                __field(dev_t, dev)
+                __field(xfs_ino_t, ino)
+                __field(xfs_fsblock_t, blocks)
+                __field(int, shift)
+                __field(unsigned int, writeio_blocks)
+        ),
+        TP_fast_assign(
+                __entry->dev = VFS_I(ip)->i_sb->s_dev;
+                __entry->ino = ip->i_ino;
+                __entry->blocks = blocks;
+                __entry->shift = shift;
+                __entry->writeio_blocks = writeio_blocks;
+        ),
+        TP_printk("dev %d:%d ino 0x%llx prealloc blocks %llu shift %d "
+                  "m_writeio_blocks %u",
+                  MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino,
+                  __entry->blocks, __entry->shift, __entry->writeio_blocks)
+)
+
 #define DEFINE_IREF_EVENT(name) \
 DEFINE_EVENT(xfs_iref_class, name, \
         TP_PROTO(struct xfs_inode *ip, unsigned long caller_ip), \