On Sun, Feb 15, 2009 at 04:35:28PM +0530, Aneesh Kumar K.V wrote: > Here is how it works. During writepages we loop through the dirty pages > and build largest contiguous block extent (mpage_add_bh_to_extent). Then we call > mpage_da_map_blocks. mpage_da_map_blocks does the mutli block request. > Once we have the blocks allocated we map these blocks to the pages. And > then we writeback one page at a time using writepage callback. mpage_da_map_blocks() calls mpd->get_block, which is set to ext4_da_get_block_write(), which allocates a single block at a time (max_blocks is set to bh->b_size >> inode->i_blkbits). Put another way, where is the call to ext4_get_blocks_wrap() which does the multi-block request? I don't see it... - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
