linux-kernel - [PATCH 4.14 43/46] md: Avoid namespace collision with bitmap API

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Date:   Tue, 28 Jan 2020 14:58:17 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Shaohua Li <shli@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 4.14 43/46] md: Avoid namespace collision with bitmap API

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

commit e64e4018d572710c44f42c923d4ac059f0a23320 upstream.

bitmap API (include/linux/bitmap.h) has 'bitmap' prefix for its methods.

On the other hand MD bitmap API is special case.
Adding 'md' prefix to it to avoid name space collision.

No functional changes intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Acked-by: Shaohua Li <shli@...nel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
[only take the bitmap_free change for stable - gregkh]
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/bitmap.c     |   10 +++++-----
 drivers/md/bitmap.h     |    2 +-
 drivers/md/md-cluster.c |    6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)

--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1729,7 +1729,7 @@ void bitmap_flush(struct mddev *mddev)
 /*
  * free memory that was allocated
  */
-void bitmap_free(struct bitmap *bitmap)
+void md_bitmap_free(struct bitmap *bitmap)
 {
 	unsigned long k, pages;
 	struct bitmap_page *bp;
@@ -1763,7 +1763,7 @@ void bitmap_free(struct bitmap *bitmap)
 	kfree(bp);
 	kfree(bitmap);
 }
-EXPORT_SYMBOL(bitmap_free);
+EXPORT_SYMBOL(md_bitmap_free);
 
 void bitmap_wait_behind_writes(struct mddev *mddev)
 {
@@ -1796,7 +1796,7 @@ void bitmap_destroy(struct mddev *mddev)
 	if (mddev->thread)
 		mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
 
-	bitmap_free(bitmap);
+	md_bitmap_free(bitmap);
 }
 
 /*
@@ -1887,7 +1887,7 @@ struct bitmap *bitmap_create(struct mdde
 
 	return bitmap;
  error:
-	bitmap_free(bitmap);
+	md_bitmap_free(bitmap);
 	return ERR_PTR(err);
 }
 
@@ -1958,7 +1958,7 @@ struct bitmap *get_bitmap_from_slot(stru
 
 	rv = bitmap_init_from_disk(bitmap, 0);
 	if (rv) {
-		bitmap_free(bitmap);
+		md_bitmap_free(bitmap);
 		return ERR_PTR(rv);
 	}
 
--- a/drivers/md/bitmap.h
+++ b/drivers/md/bitmap.h
@@ -271,7 +271,7 @@ int bitmap_resize(struct bitmap *bitmap,
 struct bitmap *get_bitmap_from_slot(struct mddev *mddev, int slot);
 int bitmap_copy_from_slot(struct mddev *mddev, int slot,
 				sector_t *lo, sector_t *hi, bool clear_bits);
-void bitmap_free(struct bitmap *bitmap);
+void md_bitmap_free(struct bitmap *bitmap);
 void bitmap_wait_behind_writes(struct mddev *mddev);
 #endif
 
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1128,7 +1128,7 @@ int cluster_check_sync_size(struct mddev
 		bm_lockres = lockres_init(mddev, str, NULL, 1);
 		if (!bm_lockres) {
 			pr_err("md-cluster: Cannot initialize %s\n", str);
-			bitmap_free(bitmap);
+			md_bitmap_free(bitmap);
 			return -1;
 		}
 		bm_lockres->flags |= DLM_LKF_NOQUEUE;
@@ -1142,11 +1142,11 @@ int cluster_check_sync_size(struct mddev
 			sync_size = sb->sync_size;
 		else if (sync_size != sb->sync_size) {
 			kunmap_atomic(sb);
-			bitmap_free(bitmap);
+			md_bitmap_free(bitmap);
 			return -1;
 		}
 		kunmap_atomic(sb);
-		bitmap_free(bitmap);
+		md_bitmap_free(bitmap);
 	}
 
 	return (my_sync_size == sync_size) ? 0 : -1;