linux-kernel - [PATCH] squashfs broken when pageszie

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Date:	Mon, 13 Apr 2009 15:57:17 -0400
From:	Doug Chapman <doug.chapman@...com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	phillip@...gher.demon.co.uk
Subject: [PATCH] squashfs broken when pageszie > blocksize

Squashfs is broken on any system where the pageszie is larger than either
the block size of the squashfs image or larger than the metadata size (8192).
This is easily fixed by ensuring cache->pages is always > 0.

Signed-off-by: Doug Chapman <doug.chapman@...com>
Cc: Phillip Lougher <phillip@...gher.demon.co.uk>

---
diff --git a/fs/squashfs/cache.c b/fs/squashfs/cache.c
index 1c4739e..c31aa89 100644
--- a/fs/squashfs/cache.c
+++ b/fs/squashfs/cache.c
@@ -252,6 +252,7 @@ struct squashfs_cache *squashfs_cache_init(char *name, int entries,
 	cache->entries = entries;
 	cache->block_size = block_size;
 	cache->pages = block_size >> PAGE_CACHE_SHIFT;
+	cache->pages = cache->pages?cache->pages:1;
 	cache->name = name;
 	cache->num_waiters = 0;
 	spin_lock_init(&cache->lock);


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