linux-kernel - Re: [PATCH] Fix panic in __d_lookup with high dentry hashtable counts

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Date:	Fri, 13 Jan 2012 17:15:46 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dimitri Sivanich <sivanich@....com>
Cc:	linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Avi Kivity <avi@...hat.com>,
	linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] Fix panic in __d_lookup with high dentry hashtable
 counts

Le vendredi 13 janvier 2012 à 09:52 -0600, Dimitri Sivanich a écrit :
> When the number of dentry cache hash table entries gets too high
> (2147483648 entries), use of a signed integer in the initialization
> loop prevents the dentry_hashtable from getting initialized, resulting
> in a panic in __d_lookup.  Fixing this in dcache_init and a few other
> spots for consistency.

Well...

nr_dentry being an int, I dont think having a so big hash table is
needed/possible. Its probably a waste of memory ?

Maybe we should limit alloc_large_system_hash() to at most 2^30 slots.

[ And later, convert it to unsigned long *_hash_shift and unsigned long
*_hash_mask ]



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