Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.11 053/601] md: Fix missing unused status line of /proc/mdstat | Date | Wed, 12 May 2021 16:42:10 +0200 |
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From: Jan Glauber <jglauber@digitalocean.com>
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@vger.kernel.org Fixes: 1f4aace60b0e ("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> --- drivers/md/md.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8187,7 +8187,11 @@ 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 */
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