Btrfs: space leak tracepoints

This in addition to a script in my btrfs-tracing tree will help track down space
leaks when we're getting space left over in block groups on umount.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 1750c0e6660c..84f3001a568d 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -55,6 +55,8 @@ struct extent_buffer;
         { BTRFS_BLOCK_GROUP_DUP,        "DUP"}, \
         { BTRFS_BLOCK_GROUP_RAID10,     "RAID10"}
 
+#define BTRFS_UUID_SIZE 16
+
 TRACE_EVENT(btrfs_transaction_commit,
 
         TP_PROTO(struct btrfs_root *root),
@@ -632,6 +634,34 @@ TRACE_EVENT(btrfs_cow_block,
                   __entry->cow_level)
 );
 
+TRACE_EVENT(btrfs_space_reservation,
+
+        TP_PROTO(struct btrfs_fs_info *fs_info, char *type, u64 val,
+                 u64 bytes, int reserve),
+
+        TP_ARGS(fs_info, type, val, bytes, reserve),
+
+        TP_STRUCT__entry(
+                __array(        u8,     fsid,   BTRFS_UUID_SIZE )
+                __string(       type,   type                    )
+                __field(        u64,    val                     )
+                __field(        u64,    bytes                   )
+                __field(        int,    reserve                 )
+        ),
+
+        TP_fast_assign(
+                memcpy(__entry->fsid, fs_info->fsid, BTRFS_UUID_SIZE);
+                __assign_str(type, type);
+                __entry->val            = val;
+                __entry->bytes          = bytes;
+                __entry->reserve        = reserve;
+        ),
+
+        TP_printk("%pU: %s: %Lu %s %Lu", __entry->fsid, __get_str(type),
+                  __entry->val, __entry->reserve ? "reserve" : "release",
+                  __entry->bytes)
+);
+
 DECLARE_EVENT_CLASS(btrfs__reserved_extent,
 
         TP_PROTO(struct btrfs_root *root, u64 start, u64 len),