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| author |   David Woodhouse <dwmw2@infradead.org> | 2006-05-20 16:13:34 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2006-05-20 16:13:34 +0100 |
| commit | 9641b784ff82cf0a48a6c70ef9867f5fd728de67 (patch) | |
| tree | 40d7bbc06ee5e54560ea7e7dabe75ac01a72e00c /fs/jffs2/summary.h | |
| parent | [MTD] Avoid 64-bit division in mtdconcat (diff) | |
| download | linux-dev-9641b784ff82cf0a48a6c70ef9867f5fd728de67.tar.xz linux-dev-9641b784ff82cf0a48a6c70ef9867f5fd728de67.zip | |
[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>
Diffstat (limited to 'fs/jffs2/summary.h')
| -rw-r--r-- | fs/jffs2/summary.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/jffs2/summary.h b/fs/jffs2/summary.h index b7a678be1709..afff4bd551a1 100644 --- a/fs/jffs2/summary.h +++ b/fs/jffs2/summary.h @@ -160,7 +160,8 @@ int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size); int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs); int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs); int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, - uint32_t ofs, uint32_t *pseudo_random); + struct jffs2_raw_summary *summary, uint32_t sumlen, + uint32_t *pseudo_random); #else /* SUMMARY DISABLED */ |