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vfs: fix panic in __d_lookup() with high dentry hashtable counts

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When the number of dentry cache hash table entries gets too high
(2147483648 entries), as happens by default on a 16TB system, use of a
signed integer in the dcache_init() initialization loop prevents the
dentry_hashtable from getting initialized, causing a panic in
__d_lookup().  Fix this in dcache_init() and similar areas.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Dimitri Sivanich
2012-02-08 12:39:07 -08:00
committed by Al Viro
parent 1d6f209786
commit 074b85175a
5 changed files with 14 additions and 12 deletions
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1
mm/page_alloc.c
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@ -5236,6 +5236,7 @@ void *__init alloc_large_system_hash(const char *tablename,
max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4;
do_div(max, bucketsize);
}
max = min(max, 0x80000000ULL);
if (numentries > max)
numentries = max;