Re: [patch] truncate fixes

From: Andrea Arcangeli (andrea@suse.de)
Date: Sun Jan 06 2002 - 22:32:36 EST


On Sat, Jan 05, 2002 at 03:08:25AM -0800, Andrew Morton wrote:
> }
> return 0;
> out:
> + bh = head;
> + block_start = 0;
> + do {
> + if (buffer_new(bh) && !buffer_uptodate(bh)) {
> + memset(kaddr+block_start, 0, bh->b_size);
> + set_bit(BH_Uptodate, &bh->b_state);
> + mark_buffer_dirty(bh);
> + }
> + block_start += bh->b_size;
> + bh = bh->b_this_page;
> + } while (bh != head);
> return err;
> }

the above code will end marking uptodate (zeroed) buffers relative to
blocks that cannot be read from disk. So a read-retry won't hit the disk
and that's wrong.

I think that will be fixed by additionally also return -EIO in the
wait_on_buffer loop (instead of goto out), so we won't generate zeroed
uptodate cache in case of read failure.

Andrea
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