I would argue that one common cause of the EIO is userland
error (mmap concurrent with O_DIRECT), and EIO is the correct answer.
I disagree. That means that using the pagecache to synchronize
things like
the proposed online defragmentation will occasionally make O_DIRECT
users
fail.
Well, only if the pages couldn't be invalidated. Arguably ext3
should be trying a lot harder to invalidate before giving up and
returning failure from invalidate_page().
Hopefully this all goes away in the long term with Chris'
"placeholder" work that stops insertions into the radix tree while
dio ops are in flight.
- z
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