jffs2: Dynamically choose inocache hash size

When JFFS2 is used for large volumes, the mount times are quite long.
Increasing the hash size provides a significant speed boost on the OLPC
XO-1 laptop.

Add logic that dynamically selects a hash size based on the size of
the medium. A 64mb medium will result in a hash size of 128, and a 512mb
medium will result in a hash size of 1024.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 21 insertions, 1 deletions

diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index 6b2964a19850..2701b372da78 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -478,6 +478,25 @@ 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)
 {
@@ -524,7 +543,8 @@ 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;