This is a note to let you know that I've just added the patch titled
md: Fix missing unused status line of /proc/mdstat
to the 5.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-fix-missing-unused-status-line-of-proc-mdstat.patch
and it can be found in the queue-5.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7abfabaf5f805f5171d133ce6af9b65ab766e76a Mon Sep 17 00:00:00 2001
From: Jan Glauber <jglauber@xxxxxxxxxxxxxxxx>
Date: Wed, 17 Mar 2021 15:04:39 +0100
Subject: md: Fix missing unused status line of /proc/mdstat
From: Jan Glauber <jglauber@xxxxxxxxxxxxxxxx>
commit 7abfabaf5f805f5171d133ce6af9b65ab766e76a upstream.
Reading /proc/mdstat with a read buffer size that would not
fit the unused status line in the first read will skip this
line from the output.
So 'dd if=/proc/mdstat bs=64 2>/dev/null' will not print something
like: unused devices: <none>
Don't return NULL immediately in start() for v=2 but call
show() once to print the status line also for multiple reads.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 1f4aace60b0e ("fs/seq_file.c: simplify seq_file iteration code and interface")
Signed-off-by: Jan Glauber <jglauber@xxxxxxxxxxxxxxxx>
Signed-off-by: Song Liu <songliubraving@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/md.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8172,7 +8172,11 @@ static void *md_seq_start(struct seq_fil
loff_t l = *pos;
struct mddev *mddev;
- if (l >= 0x10000)
+ if (l == 0x10000) {
+ ++*pos;
+ return (void *)2;
+ }
+ if (l > 0x10000)
return NULL;
if (!l--)
/* header */
Patches currently in stable-queue which might be from jglauber@xxxxxxxxxxxxxxxx are
queue-5.12/md-fix-missing-unused-status-line-of-proc-mdstat.patch
