> So what exactly does generic_segments_check() give us? Is it just that
> everybody went "well, maybe there's some weird path where we don't do
> validation; let's leave it there"? Linus?
Sounds likely. I'd bet that the btrfs call was just copied from
__generic_file_aio_write() when btrfs grew its own .aio_write method:
11c65dccf70be9ace5dbd3906778e1a099b1fee1
Author: Josef Bacik <josef@xxxxxxxxxx>
Date: Sun May 23 11:07:21 2010 -0400
Btrfs: do aio_write instead of write
It probably amounts to no more than ocount = iov_length().
- z
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