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| author | Dimitri Sivanich <sivanich@sgi.com> | 2012-02-08 12:39:07 -0800 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2012-02-13 20:45:38 -0500 |
| commit | 074b85175a43a23fdbde60f55feea636e0bf0f85 (patch) | |
| tree | e6f6fdd82854b2bf25ea5b404cee010806a8fced /fs/dcache.c | |
| parent | 1d6f2097865e64963e90cce04980dce2f9fc023f (diff) | |
| download | linux-074b85175a43a23fdbde60f55feea636e0bf0f85.tar.gz linux-074b85175a43a23fdbde60f55feea636e0bf0f85.tar.bz2 linux-074b85175a43a23fdbde60f55feea636e0bf0f85.zip | |
vfs: fix panic in __d_lookup() with high dentry hashtable counts
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>
Diffstat (limited to 'fs/dcache.c')
| -rw-r--r-- | fs/dcache.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 16a53cc2cc02..fe19ac13f75f 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -2968,7 +2968,7 @@ __setup("dhash_entries=", set_dhash_entries); static void __init dcache_init_early(void) { - int loop; + unsigned int loop; /* If hashes are distributed across NUMA nodes, defer * hash allocation until vmalloc space is available. @@ -2986,13 +2986,13 @@ static void __init dcache_init_early(void) &d_hash_mask, 0); - for (loop = 0; loop < (1 << d_hash_shift); loop++) + for (loop = 0; loop < (1U << d_hash_shift); loop++) INIT_HLIST_BL_HEAD(dentry_hashtable + loop); } static void __init dcache_init(void) { - int loop; + unsigned int loop; /* * A constructor could be added for stable state like the lists, @@ -3016,7 +3016,7 @@ static void __init dcache_init(void) &d_hash_mask, 0); - for (loop = 0; loop < (1 << d_hash_shift); loop++) + for (loop = 0; loop < (1U << d_hash_shift); loop++) INIT_HLIST_BL_HEAD(dentry_hashtable + loop); } |