- /*
- * Do the readahead (8k)
- */
- if (!offset) {
- for (i = 16 >> (sb->s_blocksize_bits - 9), num = 0;
+ /* The idea here is to begin with 8k read-ahead and to stay
+ * 4k ahead of our current position.
+ *
+ * TODO: Use the pagecache for this. We just need to
+ * make sure it's cluster-safe... */
+ if (!last_ra_blk
+ || (((last_ra_blk - blk) << 9) <= (ra_sectors / 2))) {
+ for (i = ra_sectors >> (sb->s_blocksize_bits - 9);