[JFFS2] Optimise reading of eraseblock summary nodes

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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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This commit is contained in:

David Woodhouse 2006-05-20 16:13:34 +01:00

parent 6c8b44abc8

commit 9641b784ff

3 changed files with 64 additions and 49 deletions

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78

fs/jffs2/scan.c

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36

fs/jffs2/summary.c

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3

fs/jffs2/summary.h

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