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

@@ -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"

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

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"

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"

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"

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"

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"

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

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"

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"

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"

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"