The patch titled
Subject: zram: allow backing device to be assigned after init
has been added to the -mm tree. Its filename is
zram-allow-backing-device-to-be-assigned-after-init.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/zram-allow-backing-device-to-be-assigned-after-init.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/zram-allow-backing-device-to-be-assigned-after-init.patch
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------------------------------------------------------
From: Brian Geffon <bgeffon@xxxxxxxxxx>
Subject: zram: allow backing device to be assigned after init
There does not appear to be a technical reason to not allow the zram
backing device to be assigned after the zram device is initialized.
This change will allow for the backing device to be assigned as long as no
backing device is already assigned. In that event backing_dev would
return -EEXIST.
Link: https://lkml.kernel.org/r/20211001181627.394921-1-bgeffon@xxxxxxxxxx
Signed-off-by: Brian Geffon <bgeffon@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Cc: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Suleiman Souhlal <suleiman@xxxxxxxxxx>
Cc: Jesse Barnes <jsbarnes@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/zram/zram_drv.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/block/zram/zram_drv.c~zram-allow-backing-device-to-be-assigned-after-init
+++ a/drivers/block/zram/zram_drv.c
@@ -492,9 +492,9 @@ static ssize_t backing_dev_store(struct
return -ENOMEM;
down_write(&zram->init_lock);
- if (init_done(zram)) {
- pr_info("Can't setup backing device for initialized device\n");
- err = -EBUSY;
+ if (zram->backing_dev) {
+ pr_info("Backing device is already assigned\n");
+ err = -EEXIST;
goto out;
}
_
Patches currently in -mm which might be from bgeffon@xxxxxxxxxx are
zram-introduce-an-aged-idle-interface.patch
zram-introduce-an-aged-idle-interface-v5.patch
zram-introduce-an-aged-idle-interface-v6.patch
zram-allow-backing-device-to-be-assigned-after-init.patch
