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CLEANMARKER obsolete, last-ic cache.
I've committed code to the trunk to remember the last inode_cache looked
up, and to mark CLEANMARKER nodes obsolete in jffs2_do_reserve_space() when
we first start to allocate from a new block.
What I think I'll do next is preread the whole erase block at the beginning
of jffs2_scan_eraseblock() instead of reading it all in little pieces to
little buffers. In jffs2_scan_medium() we can vmalloc() an eraseblock-sized
space for this. I don't think that's too evil.
Next optimisation will be to lock the flash chip down and just use a
pointer into the chip itself, of course - once all the actual scan code is
set up to deal with the fact that it's just dealing with a pointer to the
Your optimisation of checking for a cleanmarker and avoiding the scan for
0xFF will still be possible, if you can work out a way to make it reliable
with older filesystems that didn't obsolete the cleanmarker. You just put
that check before the large read at the beginning of jffs2_scan_eraseblock().
Btw, there's now an IRC channel on irc.openprojects.net - #mtd.
Semi-intelligent conversation has been known to occur there, between Thomas
and I who are the only people on it so far.
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