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

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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>

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Jan Glauber 2021-03-17 15:04:39 +01:00 • committed by Song Liu

parent 254c271da0

commit 7abfabaf5f

1 changed files with 5 additions and 1 deletions

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drivers/md/md.c

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