Chris Mason wrote:
[ use i_mutex for reads? ]
But, we already need the code that btrfs_page_mkwrite uses. It should
be enough to wait for the ordered extents and have the extent range
locked.
You don't mean have the lock_extent active while I issue the
btrfs_wait_ordered_range as I found that was a deadlock when
I tried it before. AFAICS without i_mutex I have to do this
all unlocked and hope they are not being stupid.
The cost of i_mutex on parallel readers + high speed devices can be
surprising.
OK, I did not have i_mutex until the very last days of coding when
I could not find any way to fix my problems. I'll see if I can
come up with something that makes Josef think my vector code is
pretty by comparison ;)
jim
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