linux-ext4 - Re: [PATCH] JBD: use GFP

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Message-ID: <20070920042521.GU32520@schatzie.adilger.int>
Date:	Wed, 19 Sep 2007 22:25:21 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	ext4 development <linux-ext4@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] JBD: use GFP_NOFS  in kmalloc

On Sep 19, 2007  12:22 -0700, Mingming Cao wrote:
> Convert the GFP_KERNEL flag used in JBD/JBD2 to GFP_NOFS, consistent
> with the rest of kmalloc flag used in the JBD/JBD2 layer.
> 
> @@ -653,7 +653,7 @@ static journal_t * journal_init_common (
> -	journal = kmalloc(sizeof(*journal), GFP_KERNEL);
> +	journal = kmalloc(sizeof(*journal), GFP_NOFS);
> @@ -723,7 +723,7 @@ journal_t * journal_init_dev(struct bloc
> -	journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
> +	journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_NOFS);
> @@ -777,7 +777,7 @@ journal_t * journal_init_inode (struct i
> -	journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_KERNEL);
> +	journal->j_wbuf = kmalloc(n * sizeof(struct buffer_head*), GFP_NOFS);

Is there a reason for this change except "it's in a filesystem, so it
should be GFP_NOFS"?  We are only doing journal setup during mount so
there shouldn't be any problem using GFP_KERNEL.  I don't think it will
inject any defect into the code, but I don't think it is needed either.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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