X-Git-Url: https://bbs.cooldavid.org/git/?p=net-next-2.6.git;a=blobdiff_plain;f=fs%2Faio.c;h=8c8f6c5b6d7930657f7a3aadf44fe4b4dc96b738;hp=250b0a73c8a8ca92b78c3a0282d2425ce7649dcf;hb=HEAD;hpb=c70b5296e775cde46cfcb2d860ba160108a5ec7a

diff --git a/fs/aio.c b/fs/aio.c
index 250b0a73c8a..8c8f6c5b6d7 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1543,7 +1543,19 @@ static void aio_batch_add(struct address_space *mapping,
 	}
 
 	abe = mempool_alloc(abe_pool, GFP_KERNEL);
-	BUG_ON(!igrab(mapping->host));
+
+	/*
+	 * we should be using igrab here, but
+	 * we don't want to hammer on the global
+	 * inode spinlock just to take an extra
+	 * reference on a file that we must already
+	 * have a reference to.
+	 *
+	 * When we're called, we always have a reference
+	 * on the file, so we must always have a reference
+	 * on the inode, so ihold() is safe here.
+	 */
+	ihold(mapping->host);
 	abe->mapping = mapping;
 	hlist_add_head(&abe->list, &batch_hash[bucket]);
 	return;