linux-kernel - [PATCH v5 01/11] loop: Call loop_config_discard() only after new config is applied

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Message-Id: <20200513133845.244903-2-maco@android.com>
Date:   Wed, 13 May 2020 15:38:35 +0200
From:   Martijn Coenen <maco@...roid.com>
To:     axboe@...nel.dk, hch@....de, ming.lei@...hat.com
Cc:     narayan@...gle.com, zezeozue@...gle.com, maco@...gle.com,
        kernel-team@...roid.com, bvanassche@....org,
        Chaitanya.Kulkarni@....com, jaegeuk@...nel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martijn Coenen <maco@...roid.com>, Bob Liu <bob.liu@...cle.com>
Subject: [PATCH v5 01/11] loop: Call loop_config_discard() only after new config is applied

loop_set_status() calls loop_config_discard() to configure discard for
the loop device; however, the discard configuration depends on whether
the loop device uses encryption, and when we call it the encryption
configuration has not been updated yet. Move the call down so we apply
the correct discard configuration based on the new configuration.

Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Bob Liu <bob.liu@...cle.com>
Reviewed-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: Martijn Coenen <maco@...roid.com>
---
 drivers/block/loop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index da693e6a834e..f1754262fc94 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1334,8 +1334,6 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 		}
 	}
 
-	loop_config_discard(lo);
-
 	memcpy(lo->lo_file_name, info->lo_file_name, LO_NAME_SIZE);
 	memcpy(lo->lo_crypt_name, info->lo_crypt_name, LO_NAME_SIZE);
 	lo->lo_file_name[LO_NAME_SIZE-1] = 0;
@@ -1359,6 +1357,8 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 		lo->lo_key_owner = uid;
 	}
 
+	loop_config_discard(lo);
+
 	/* update dio if lo_offset or transfer is changed */
 	__loop_update_dio(lo, lo->use_dio);
 
-- 
2.26.2.645.ge9eca65c58-goog