linux-kernel - Re: [PATCH] block/blk-core.c: print readable string instead of values.

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Date:	Mon, 14 Apr 2014 15:27:27 -0700
From:	Joe Perches <joe@...ches.com>
To:	Muthukumar R <muthu.lkml@...il.com>
Cc:	Jianyu Zhan <nasa4836@...il.com>, Jens Axboe <axboe@...nel.dk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] block/blk-core.c: print readable string instead of
 values.

On Mon, 2014-04-14 at 15:00 -0700, Muthukumar R wrote:
> FYI, bi_rw tracks more than WRITE or READ...
> 
> On Sat, Apr 12, 2014 at 12:22 AM, Jianyu Zhan <nasa4836@...il.com> wrote:
> > Print the r/w direction string instead of internal values.
[]
> > diff --git a/block/blk-core.c b/block/blk-core.c
[]
> > @@ -1625,9 +1625,9 @@ static void handle_bad_sector(struct bio *bio)
> >         char b[BDEVNAME_SIZE];
> >
> >         printk(KERN_INFO "attempt to access beyond end of device\n");
> > -       printk(KERN_INFO "%s: rw=%ld, want=%Lu, limit=%Lu\n",
> > +       printk(KERN_INFO "%s: rw=%s, want=%Lu, limit=%Lu\n",
> >                         bdevname(bio->bi_bdev, b),
> > -                       bio->bi_rw,
> > +                       (bio->bi_rw & WRITE) ? "WRITE" : "READ",

Perhaps print the hex value as well and emit
both messages on a single line to make grepping
a bit easier.

Something like:
---
 block/blk-core.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index a0e3096..2a710df 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1624,12 +1624,11 @@ static void handle_bad_sector(struct bio *bio)
 {
 	char b[BDEVNAME_SIZE];
 
-	printk(KERN_INFO "attempt to access beyond end of device\n");
-	printk(KERN_INFO "%s: rw=%ld, want=%Lu, limit=%Lu\n",
-			bdevname(bio->bi_bdev, b),
-			bio->bi_rw,
-			(unsigned long long)bio_end_sector(bio),
-			(long long)(i_size_read(bio->bi_bdev->bd_inode) >> 9));
+	printk(KERN_INFO "%s: attempt to access beyond end of device - rw=%s(%lx), want=%Lu, limit=%Lu\n",
+	       bdevname(bio->bi_bdev, b),
+	       bio->bi_rw & WRITE ? "WRITE" : "READ", bio->bi_rw,
+	       (unsigned long long)bio_end_sector(bio),
+	       (long long)(i_size_read(bio->bi_bdev->bd_inode) >> 9));
 
 	set_bit(BIO_EOF, &bio->bi_flags);
 }


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