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authorDavid Woodhouse <dwmw2@infradead.org>2006-05-20 17:13:34 +0200
committerDavid Woodhouse <dwmw2@infradead.org>2006-05-20 17:13:34 +0200
commit9641b784ff82cf0a48a6c70ef9867f5fd728de67 (patch)
tree40d7bbc06ee5e54560ea7e7dabe75ac01a72e00c /fs/jffs2/nodemgmt.c
parent[MTD] Avoid 64-bit division in mtdconcat (diff)
downloadlinux-9641b784ff82cf0a48a6c70ef9867f5fd728de67.tar.xz
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[JFFS2] Optimise reading of eraseblock summary nodes
This improves the time to mount 512MiB of NAND flash on my OLPC prototype by about 4%. We used to read the last page of the eraseblock twice -- once to find the offset of the summary node, and again to actually _read_ the summary node. Now we read the last page only once, and read more only if we need to. We also don't allocate a new buffer just for the summary code -- we use the buffer which was already allocated for the scan. Better still, if the 'buffer' for the scan is actually just a pointer directly into NOR flash, we use that too, avoiding the memcpy() which we used to do. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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