btrfs: add tracepoints for outstanding extents mods

This is handy for tracing problems with modifying the outstanding
extents counters.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index bed88811f686ac7288db01317d8138480430e38b..427c8738a3bdeaea5fca9f4f47d2ccd501ca58aa 100644 (file)
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -274,6 +274,8 @@ static inline void btrfs_mod_outstanding_extents(struct btrfs_inode *inode,
        inode->outstanding_extents += mod;
        if (btrfs_is_free_space_inode(inode))
                return;
+       trace_btrfs_inode_mod_outstanding_extents(inode->root, btrfs_ino(inode),
+                                                 mod);
 }
 
 static inline void btrfs_mod_reserved_extents(struct btrfs_inode *inode, int mod)

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index bfe2f23b578c396c6624a890ce766be5e6a8b067..5848ae7845dacc997cd1f9f2407d4cc43e723bbf 100644 (file)
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -1695,6 +1695,27 @@ DEFINE_EVENT(btrfs__prelim_ref, btrfs_prelim_ref_insert,
        TP_ARGS(fs_info, oldref, newref, tree_size)
 );
 
+TRACE_EVENT(btrfs_inode_mod_outstanding_extents,
+       TP_PROTO(struct btrfs_root *root, u64 ino, int mod),
+
+       TP_ARGS(root, ino, mod),
+
+       TP_STRUCT__entry_btrfs(
+               __field(        u64, root_objectid      )
+               __field(        u64, ino                )
+               __field(        int, mod                )
+       ),
+
+       TP_fast_assign_btrfs(root->fs_info,
+               __entry->root_objectid  = root->objectid;
+               __entry->ino            = ino;
+               __entry->mod            = mod;
+       ),
+
+       TP_printk_btrfs("root=%llu(%s) ino=%llu mod=%d",
+                       show_root_type(__entry->root_objectid),
+                       (unsigned long long)__entry->ino, __entry->mod)
+);
 #endif /* _TRACE_BTRFS_H */
 
 /* This part must be outside protection */