From 602cbe91fb012a923a9fea880e600e004eb1543b Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.com>
Date: Wed, 21 Aug 2019 18:48:25 +0200
Subject: [PATCH] btrfs: move cond_wake_up functions out of ctree

The file ctree.h serves as a header for everything and has become quite
bloated. Split some helpers that are generic and create a new file that
should be the catch-all for code that's not btrfs-specific.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/compression.c   |  1 +
 fs/btrfs/ctree.h         | 22 ----------------------
 fs/btrfs/delayed-inode.c |  1 +
 fs/btrfs/dev-replace.c   |  1 +
 fs/btrfs/extent-tree.c   |  1 +
 fs/btrfs/inode.c         |  1 +
 fs/btrfs/locking.c       |  1 +
 fs/btrfs/misc.h          | 33 +++++++++++++++++++++++++++++++++
 fs/btrfs/ordered-data.c  |  1 +
 fs/btrfs/transaction.c   |  1 +
 fs/btrfs/tree-log.c      |  1 +
 fs/btrfs/zstd.c          |  1 +
 12 files changed, 43 insertions(+), 22 deletions(-)
 create mode 100644 fs/btrfs/misc.h

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index fe7a8b5ff96c..b05b361e2062 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -18,6 +18,7 @@
 #include <linux/sched/mm.h>
 #include <linux/log2.h>
 #include <crypto/hash.h>
+#include "misc.h"
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ef40fffb5e46..5cb410cc1502 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3517,26 +3517,4 @@ static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
 }
 #endif
 
-static inline void cond_wake_up(struct wait_queue_head *wq)
-{
-	/*
-	 * This implies a full smp_mb barrier, see comments for
-	 * waitqueue_active why.
-	 */
-	if (wq_has_sleeper(wq))
-		wake_up(wq);
-}
-
-static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
-{
-	/*
-	 * Special case for conditional wakeup where the barrier required for
-	 * waitqueue_active is implied by some of the preceding code. Eg. one
-	 * of such atomic operations (atomic_dec_and_return, ...), or a
-	 * unlock/lock sequence, etc.
-	 */
-	if (waitqueue_active(wq))
-		wake_up(wq);
-}
-
 #endif
diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index 9318cf761a07..1f7f39b10bd0 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -6,6 +6,7 @@
 
 #include <linux/slab.h>
 #include <linux/iversion.h>
+#include "misc.h"
 #include "delayed-inode.h"
 #include "disk-io.h"
 #include "transaction.h"
diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 00ea828beb00..48890826b5e6 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -9,6 +9,7 @@
 #include <linux/blkdev.h>
 #include <linux/kthread.h>
 #include <linux/math64.h>
+#include "misc.h"
 #include "ctree.h"
 #include "extent_map.h"
 #include "disk-io.h"
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index af7631472073..795b592e5269 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -16,6 +16,7 @@
 #include <linux/percpu_counter.h>
 #include <linux/lockdep.h>
 #include <linux/crc32c.h>
+#include "misc.h"
 #include "tree-log.h"
 #include "disk-io.h"
 #include "print-tree.h"
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d79ad5abd06e..07f77c7e6b22 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -30,6 +30,7 @@
 #include <linux/swap.h>
 #include <linux/sched/mm.h>
 #include <asm/unaligned.h>
+#include "misc.h"
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
diff --git a/fs/btrfs/locking.c b/fs/btrfs/locking.c
index e4309bcf0b5f..7f9a578a1a20 100644
--- a/fs/btrfs/locking.c
+++ b/fs/btrfs/locking.c
@@ -8,6 +8,7 @@
 #include <linux/spinlock.h>
 #include <linux/page-flags.h>
 #include <asm/bug.h>
+#include "misc.h"
 #include "ctree.h"
 #include "extent_io.h"
 #include "locking.h"
diff --git a/fs/btrfs/misc.h b/fs/btrfs/misc.h
new file mode 100644
index 000000000000..ef3901238ddd
--- /dev/null
+++ b/fs/btrfs/misc.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef BTRFS_MISC_H
+#define BTRFS_MISC_H
+
+#include <linux/sched.h>
+#include <linux/wait.h>
+
+#define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len))
+
+static inline void cond_wake_up(struct wait_queue_head *wq)
+{
+	/*
+	 * This implies a full smp_mb barrier, see comments for
+	 * waitqueue_active why.
+	 */
+	if (wq_has_sleeper(wq))
+		wake_up(wq);
+}
+
+static inline void cond_wake_up_nomb(struct wait_queue_head *wq)
+{
+	/*
+	 * Special case for conditional wakeup where the barrier required for
+	 * waitqueue_active is implied by some of the preceding code. Eg. one
+	 * of such atomic operations (atomic_dec_and_return, ...), or a
+	 * unlock/lock sequence, etc.
+	 */
+	if (waitqueue_active(wq))
+		wake_up(wq);
+}
+
+#endif
diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index ae7f64a8facb..24b6c72b9a59 100644
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -7,6 +7,7 @@
 #include <linux/blkdev.h>
 #include <linux/writeback.h>
 #include <linux/sched/mm.h>
+#include "misc.h"
 #include "ctree.h"
 #include "transaction.h"
 #include "btrfs_inode.h"
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index f21416d68c2c..8624bdee8c5b 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -10,6 +10,7 @@
 #include <linux/pagemap.h>
 #include <linux/blkdev.h>
 #include <linux/uuid.h>
+#include "misc.h"
 #include "ctree.h"
 #include "disk-io.h"
 #include "transaction.h"
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 19a4b9dc669f..34d087008b72 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -8,6 +8,7 @@
 #include <linux/blkdev.h>
 #include <linux/list_sort.h>
 #include <linux/iversion.h>
+#include "misc.h"
 #include "ctree.h"
 #include "tree-log.h"
 #include "disk-io.h"
diff --git a/fs/btrfs/zstd.c b/fs/btrfs/zstd.c
index 0af4a5cd4313..764d47b107e5 100644
--- a/fs/btrfs/zstd.c
+++ b/fs/btrfs/zstd.c
@@ -17,6 +17,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/zstd.h>
+#include "misc.h"
 #include "compression.h"
 #include "ctree.h"