[Devel] [PATCH RHEL7 COMMIT] Revert "ext4: always imply discard mount option if undelying ploop is detected"

[Konstantin Khorenko]

The commit is pushed to "branch-rh7-3.10.0-957.12.2.vz7.96.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-957.12.2.vz7.96.5
------>
commit 559022840f1dedc34eb72005a512d8eee9dac1e5
Author: Konstantin Khorenko <khorenko at virtuozzo.com>
Date:   Mon May 27 15:58:49 2019 +0300

    Revert "ext4: always imply discard mount option if undelying ploop is detected"
    
    This reverts commit e9ffd584ebbe18376818b2896fb6bc2847dd1e9c.
    
    It's time to drop forcing discard mount option which was added for more
    intensive feature testing.
    
    https://jira.sw.ru/browse/PSBM-94130
    
    Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
---
 fs/ext4/super.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 623540274705..e607d8b5235f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3808,13 +3808,6 @@ static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
 	return 0;
 }
 
-#define PLOOP_DEVICE_MAJOR	182
-
-static bool is_ploop(struct super_block *sb)
-{
-	return sb->s_bdev->bd_disk->major == PLOOP_DEVICE_MAJOR;
-}
-
 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 {
 	struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
@@ -3974,7 +3967,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		set_opt(sb, ERRORS_RO);
 	if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
 		set_opt(sb, BLOCK_VALIDITY);
-	if (def_mount_opts & EXT4_DEFM_DISCARD || is_ploop(sb))
+	if (def_mount_opts & EXT4_DEFM_DISCARD)
 		set_opt(sb, DISCARD);
 
 	sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));