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md: Fix missing unused status line of /proc/mdstat

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commit 7abfabaf5f 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@vger.kernel.org
Fixes: 1f4aace60b ("fs/seq_file.c: simplify seq_file iteration code and interface")
Signed-off-by: Jan Glauber <jglauber@digitalocean.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan Glauber 2021-03-17 15:04:39 +01:00 committed by Greg Kroah-Hartman
parent b70b7ec500
commit 0035a47045
1 changed files with 5 additions and 1 deletions
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6
drivers/md/md.c
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@ -8187,7 +8187,11 @@ static void *md_seq_start(struct seq_file *seq, loff_t *pos)
loff_t l = *pos; loff_t l = *pos;
struct mddev *mddev; struct mddev *mddev;
if (l >= 0x10000) if (l == 0x10000) {
++*pos;
return (void *)2;
}
if (l > 0x10000)
return NULL; return NULL;
if (!l--) if (!l--)
/* header */ /* header */