Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux...

[pandora-kernel.git] / fs / jffs2 / fs.c

diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index d9beb06..e896e67 100644 (file)
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -474,6 +474,25 @@ struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_i
        return inode;
 }
 
+static int calculate_inocache_hashsize(uint32_t flash_size)
+{
+       /*
+        * Pick a inocache hash size based on the size of the medium.
+        * Count how many megabytes we're dealing with, apply a hashsize twice
+        * that size, but rounding down to the usual big powers of 2. And keep
+        * to sensible bounds.
+        */
+
+       int size_mb = flash_size / 1024 / 1024;
+       int hashsize = (size_mb * 2) & ~0x3f;
+
+       if (hashsize < INOCACHE_HASHSIZE_MIN)
+               return INOCACHE_HASHSIZE_MIN;
+       if (hashsize > INOCACHE_HASHSIZE_MAX)
+               return INOCACHE_HASHSIZE_MAX;
+
+       return hashsize;
+}
 
 int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
 {
@@ -520,7 +539,8 @@ int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
        if (ret)
                return ret;
 
-       c->inocache_list = kcalloc(INOCACHE_HASHSIZE, sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
+       c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size);
+       c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
        if (!c->inocache_list) {
                ret = -ENOMEM;
                goto out_wbuf;