linux-kernel - [PATCHv3 6/9] zram: report every added and removed device

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Message-Id: <1430140911-7818-7-git-send-email-sergey.senozhatsky@gmail.com>
Date:	Mon, 27 Apr 2015 22:21:48 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>
Cc:	Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [PATCHv3 6/9] zram: report every added and removed device

With dynamic device creation/removal (which will be introduced later in
the series) printing num_devices in zram_init() will not make a lot of
sense, as well as printing the number of destroyed devices in
destroy_devices(). Print per-device action (added/removed) in zram_add()
and zram_remove() instead.

Example:

[ 3645.259652] zram: Added device: zram5
[ 3646.152074] zram: Added device: zram6
[ 3650.585012] zram: Removed device: zram5
[ 3655.845584] zram: Added device: zram8
[ 3660.975223] zram: Removed device: zram6

Acked-by: Minchan Kim <minchan@...nel.org>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
---
 drivers/block/zram/zram_drv.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index b875517..ec6396c 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1236,6 +1236,8 @@ static int zram_add(int device_id)
 	strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor));
 	zram->meta = NULL;
 	zram->max_comp_streams = 1;
+
+	pr_info("Added device: %s\n", zram->disk->disk_name);
 	return 0;
 
 out_free_disk:
@@ -1252,6 +1254,7 @@ out_free_dev:
 
 static void zram_remove(struct zram *zram)
 {
+	pr_info("Removed device: %s\n", zram->disk->disk_name);
 	/*
 	 * Remove sysfs first, so no one will perform a disksize
 	 * store while we destroy the devices
@@ -1278,7 +1281,6 @@ static void destroy_devices(void)
 	idr_for_each(&zram_index_idr, &zram_remove_cb, NULL);
 	idr_destroy(&zram_index_idr);
 	unregister_blkdev(zram_major, "zram");
-	pr_info("Destroyed device(s)\n");
 }
 
 static int __init zram_init(void)
@@ -1297,7 +1299,6 @@ static int __init zram_init(void)
 			goto out_error;
 	}
 
-	pr_info("Created %u device(s)\n", num_devices);
 	return 0;
 
 out_error:
-- 
2.4.0.rc3.3.g6eb1401

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