openwrt-mirror/target/linux/generic/patches-3.10/041-UBI-block-do-not-use-term-attach.patch

From 4d283ee2517303afa54ad6cbd9342a2f748cf509 Mon Sep 17 00:00:00 2001
From: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Date: Tue, 4 Mar 2014 12:00:26 +0200
Subject: [PATCH] UBI: block: do not use term "attach"

We already use term attach/detach for UBI->MTD relations, let's not use this
for UBI->ubiblock relations to avoid confusion. Just use 'create' and 'remove'
instead. E.g., "create a R/O block device on top of a UBI volume".

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
---
 drivers/mtd/ubi/block.c | 39 ++++++++++++++++++++-------------------
 drivers/mtd/ubi/cdev.c  |  4 ++--
 drivers/mtd/ubi/ubi.h   | 14 ++++++++++----
 3 files changed, 32 insertions(+), 25 deletions(-)

--- a/drivers/mtd/ubi/block.c
+++ b/drivers/mtd/ubi/block.c
@@ -29,10 +29,10 @@
  *
  *   LEB number = addressed byte / LEB size
  *
- * This feature is compiled in the UBI core, and adds a new 'block' parameter
- * to allow early block device attaching. Runtime  block attach/detach for UBI
- * volumes is provided through two new UBI ioctls: UBI_IOCVOLATTBLK and
- * UBI_IOCVOLDETBLK.
+ * This feature is compiled in the UBI core, and adds a 'block' parameter
+ * to allow early creation of block devices on top of UBI volumes. Runtime
+ * block creation/removal for UBI volumes is provided through two UBI ioctls:
+ * UBI_IOCVOLATTBLK and UBI_IOCVOLDETBLK.
  */
 
 #include <linux/module.h>
@@ -374,7 +374,7 @@ static const struct block_device_operati
 	.getgeo	= ubiblock_getgeo,
 };
 
-int ubiblock_add(struct ubi_volume_info *vi)
+int ubiblock_create(struct ubi_volume_info *vi)
 {
 	struct ubiblock *dev;
 	struct gendisk *gd;
@@ -464,7 +464,7 @@ static void ubiblock_cleanup(struct ubib
 	put_disk(dev->gd);
 }
 
-int ubiblock_del(struct ubi_volume_info *vi)
+int ubiblock_remove(struct ubi_volume_info *vi)
 {
 	struct ubiblock *dev;
 
@@ -503,7 +503,8 @@ static void ubiblock_resize(struct ubi_v
 
 	/*
 	 * Need to lock the device list until we stop using the device,
-	 * otherwise the device struct might get released in 'ubiblock_del()'.
+	 * otherwise the device struct might get released in
+	 * 'ubiblock_remove()'.
 	 */
 	mutex_lock(&devices_mutex);
 	dev = find_dev_nolock(vi->ubi_num, vi->vol_id);
@@ -528,12 +529,12 @@ static int ubiblock_notify(struct notifi
 	switch (notification_type) {
 	case UBI_VOLUME_ADDED:
 		/*
-		 * We want to enforce explicit block device attaching for
+		 * We want to enforce explicit block device creation for
 		 * volumes, so when a volume is added we do nothing.
 		 */
 		break;
 	case UBI_VOLUME_REMOVED:
-		ubiblock_del(&nt->vi);
+		ubiblock_remove(&nt->vi);
 		break;
 	case UBI_VOLUME_RESIZED:
 		ubiblock_resize(&nt->vi);
@@ -561,7 +562,7 @@ open_volume_desc(const char *name, int u
 		return ubi_open_volume(ubi_num, vol_id, UBI_READONLY);
 }
 
-static int __init ubiblock_attach_from_param(void)
+static int __init ubiblock_create_from_param(void)
 {
 	int i, ret;
 	struct ubiblock_param *p;
@@ -582,7 +583,7 @@ static int __init ubiblock_attach_from_p
 		ubi_get_volume_info(desc, &vi);
 		ubi_close_volume(desc);
 
-		ret = ubiblock_add(&vi);
+		ret = ubiblock_create(&vi);
 		if (ret) {
 			ubi_err("block: can't add '%s' volume, err=%d\n",
 				vi.name, ret);
@@ -592,7 +593,7 @@ static int __init ubiblock_attach_from_p
 	return ret;
 }
 
-static void ubiblock_detach_all(void)
+static void ubiblock_remove_all(void)
 {
 	struct ubiblock *next;
 	struct ubiblock *dev;
@@ -618,13 +619,13 @@ int __init ubiblock_init(void)
 		return ubiblock_major;
 
 	/* Attach block devices from 'block=' module param */
-	ret = ubiblock_attach_from_param();
+	ret = ubiblock_create_from_param();
 	if (ret)
-		goto err_detach;
+		goto err_remove;
 
 	/*
-	 * Block devices needs to be attached to volumes explicitly
-	 * upon user request. So we ignore existing volumes.
+	 * Block devices are only created upon user requests, so we ignore
+	 * existing volumes.
 	 */
 	ret = ubi_register_volume_notifier(&ubiblock_notifier, 1);
 	if (ret)
@@ -633,14 +634,14 @@ int __init ubiblock_init(void)
 
 err_unreg:
 	unregister_blkdev(ubiblock_major, "ubiblock");
-err_detach:
-	ubiblock_detach_all();
+err_remove:
+	ubiblock_remove_all();
 	return ret;
 }
 
 void __exit ubiblock_exit(void)
 {
 	ubi_unregister_volume_notifier(&ubiblock_notifier);
-	ubiblock_detach_all();
+	ubiblock_remove_all();
 	unregister_blkdev(ubiblock_major, "ubiblock");
 }
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -591,7 +591,7 @@ static long vol_cdev_ioctl(struct file *
 		struct ubi_volume_info vi;
 
 		ubi_get_volume_info(desc, &vi);
-		err = ubiblock_add(&vi);
+		err = ubiblock_create(&vi);
 		break;
 	}
 
@@ -601,7 +601,7 @@ static long vol_cdev_ioctl(struct file *
 		struct ubi_volume_info vi;
 
 		ubi_get_volume_info(desc, &vi);
-		err = ubiblock_del(&vi);
+		err = ubiblock_remove(&vi);
 		break;
 	}
 
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -868,13 +868,19 @@ int ubi_scan_fastmap(struct ubi_device *
 #ifdef CONFIG_MTD_UBI_BLOCK
 int ubiblock_init(void);
 void ubiblock_exit(void);
-int ubiblock_add(struct ubi_volume_info *vi);
-int ubiblock_del(struct ubi_volume_info *vi);
+int ubiblock_create(struct ubi_volume_info *vi);
+int ubiblock_remove(struct ubi_volume_info *vi);
 #else
 static inline int ubiblock_init(void) { return 0; }
 static inline void ubiblock_exit(void) {}
-static inline int ubiblock_add(struct ubi_volume_info *vi) { return -ENOTTY; }
-static inline int ubiblock_del(struct ubi_volume_info *vi) { return -ENOTTY; }
+static inline int ubiblock_create(struct ubi_volume_info *vi)
+{
+	return -ENOTTY;
+}
+static inline int ubiblock_remove(struct ubi_volume_info *vi)
+{
+	return -ENOTTY;
+}
 #endif