Merge branch 'for-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs updates from David Sterba:
 "There are some new user features and the usual load of invisible
  enhancements or cleanups.

  New features:

   - extend mount options to specify zlib compression level, -o
     compress=zlib:9

   - v2 of ioctl "extent to inode mapping", addressing a usecase where
     we want to retrieve more but inaccurate results and do the
     postprocessing in userspace, aiding defragmentation or
     deduplication tools

   - populate compression heuristics logic, do data sampling and try to
     guess compressibility by: looking for repeated patterns, counting
     unique byte values and distribution, calculating Shannon entropy;
     this will need more benchmarking and possibly fine tuning, but the
     base should be good enough

   - enable indexing for btrfs as lower filesystem in overlayfs

   - speedup page cache readahead during send on large files

  Internal enhancements:

   - more sanity checks of b-tree items when reading them from disk

   - more EINVAL/EUCLEAN fixups, missing BLK_STS_* conversion, other
     errno or error handling fixes

   - remove some homegrown IO-related logic, that's been obsoleted by
     core block layer changes (batching, plug/unplug, own counters)

   - add ref-verify, optional debugging feature to verify extent
     reference accounting

   - simplify code handling outstanding extents, make it more clear
     where and how the accounting is done

   - make delalloc reservations per-inode, simplify the code and make
     the logic more straightforward

   - extensive cleanup of delayed refs code

  Notable fixes:

   - fix send ioctl on 32bit with 64bit kernel"

* 'for-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux: (102 commits)
  btrfs: Fix bug for misused dev_t when lookup in dev state hash table.
  Btrfs: heuristic: add Shannon entropy calculation
  Btrfs: heuristic: add byte core set calculation
  Btrfs: heuristic: add byte set calculation
  Btrfs: heuristic: add detection of repeated data patterns
  Btrfs: heuristic: implement sampling logic
  Btrfs: heuristic: add bucket and sample counters and other defines
  Btrfs: compression: separate heuristic/compression workspaces
  btrfs: move btrfs_truncate_block out of trans handle
  btrfs: don't call btrfs_start_delalloc_roots in flushoncommit
  btrfs: track refs in a rb_tree instead of a list
  btrfs: add a comp_refs() helper
  btrfs: switch args for comp_*_refs
  btrfs: make the delalloc block rsv per inode
  btrfs: add tracepoints for outstanding extents mods
  Btrfs: rework outstanding_extents
  btrfs: increase output size for LOGICAL_INO_V2 ioctl
  btrfs: add a flags argument to LOGICAL_INO and call it LOGICAL_INO_V2
  btrfs: add a flag to iterate_inodes_from_logical to find all extent refs for uncompressed extents
  btrfs: send: remove unused code
  ...

include/trace/events/btrfs.h

@@ -29,6 +29,13 @@ struct btrfs_qgroup_extent_record;
 struct btrfs_qgroup;
 struct prelim_ref;
 
+TRACE_DEFINE_ENUM(FLUSH_DELAYED_ITEMS_NR);
+TRACE_DEFINE_ENUM(FLUSH_DELAYED_ITEMS);
+TRACE_DEFINE_ENUM(FLUSH_DELALLOC);
+TRACE_DEFINE_ENUM(FLUSH_DELALLOC_WAIT);
+TRACE_DEFINE_ENUM(ALLOC_CHUNK);
+TRACE_DEFINE_ENUM(COMMIT_TRANS);
+
 #define show_ref_type(type)						\
 	__print_symbolic(type,						\
 		{ BTRFS_TREE_BLOCK_REF_KEY, 	"TREE_BLOCK_REF" },	\
@@ -792,11 +799,10 @@ DEFINE_EVENT(btrfs_delayed_data_ref,  run_delayed_data_ref,
 DECLARE_EVENT_CLASS(btrfs_delayed_ref_head,
 
 	TP_PROTO(const struct btrfs_fs_info *fs_info,
-		 const struct btrfs_delayed_ref_node *ref,
 		 const struct btrfs_delayed_ref_head *head_ref,
 		 int action),
 
-	TP_ARGS(fs_info, ref, head_ref, action),
+	TP_ARGS(fs_info, head_ref, action),
 
 	TP_STRUCT__entry_btrfs(
 		__field(	u64,  bytenr		)
@@ -806,8 +812,8 @@ DECLARE_EVENT_CLASS(btrfs_delayed_ref_head,
 	),
 
 	TP_fast_assign_btrfs(fs_info,
-		__entry->bytenr		= ref->bytenr;
-		__entry->num_bytes	= ref->num_bytes;
+		__entry->bytenr		= head_ref->bytenr;
+		__entry->num_bytes	= head_ref->num_bytes;
 		__entry->action		= action;
 		__entry->is_data	= head_ref->is_data;
 	),
@@ -822,21 +828,19 @@ DECLARE_EVENT_CLASS(btrfs_delayed_ref_head,
 DEFINE_EVENT(btrfs_delayed_ref_head,  add_delayed_ref_head,
 
 	TP_PROTO(const struct btrfs_fs_info *fs_info,
-		 const struct btrfs_delayed_ref_node *ref,
 		 const struct btrfs_delayed_ref_head *head_ref,
 		 int action),
 
-	TP_ARGS(fs_info, ref, head_ref, action)
+	TP_ARGS(fs_info, head_ref, action)
 );
 
 DEFINE_EVENT(btrfs_delayed_ref_head,  run_delayed_ref_head,
 
 	TP_PROTO(const struct btrfs_fs_info *fs_info,
-		 const struct btrfs_delayed_ref_node *ref,
 		 const struct btrfs_delayed_ref_head *head_ref,
 		 int action),
 
-	TP_ARGS(fs_info, ref, head_ref, action)
+	TP_ARGS(fs_info, head_ref, action)
 );
 
 #define show_chunk_type(type)					\
@@ -1692,6 +1696,27 @@ 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 */