On Fri, 15 Dec 2000, Linus Torvalds wrote:
[ writepage for anon buffers ]
>
> It might be 10 lines of change, and obviously correct.
>
I'll give this a try, it will be interesting regardless of if it is simple
enough for kernel inclusion.
On a related note, I hit a snag porting reiserfs into test12, where
block_read_full_page assumes the buffer it gets back from get_block won't
be up to date. When reiserfs reads a packed tail directly into the page,
reading the newly mapped buffer isn't required, and is actually a bad
idea, since the packed tails have a block number of 0 when copied into
the page cache.
In other words, after calling reiserfs_get_block, the buffer might be
mapped and uptodate, with no i/o required in block_read_full_page
The following patch to block_read_full_page fixes things for me, and seems
like a good idea in general. It might be better to apply something
similar to submit_bh instead...comments?
-chris
--- linux-test12/fs/buffer.c Mon Dec 18 11:37:42 2000
+++ linux/fs/buffer.c Mon Dec 18 11:38:36 2000
@@ -1706,8 +1706,10 @@
}
}
- arr[nr] = bh;
- nr++;
+ if (!buffer_uptodate(bh)) {
+ arr[nr] = bh;
+ nr++;
+ }
} while (i++, iblock++, (bh = bh->b_this_page) != head);
if (!nr) {
-
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