tree 12edfb1154691f1a8aaeeadb97899397574aa785
parent 323ac95bce442bbde514e3ce57e840402f80d909
author Chris Mason <chris.mason@oracle.com> 1223051402 -0400
committer Chris Mason <chris.mason@oracle.com> 1223051402 -0400

Btrfs: O_DIRECT writes via buffered writes + invaldiate

This reworks the btrfs O_DIRECT write code a bit.  It had always fallen
back to buffered IO and done an invalidate, but needed to be updated
for the data=ordered code.  The invalidate wasn't actually removing pages
because they were still inside an ordered extent.

This also combines the O_DIRECT/O_SYNC paths where possible, and kicks
off IO in the main btrfs_file_write loop to keep the pipe down the the
disk full as we process long writes.

Signed-off-by: Chris Mason <chris.mason@oracle.com>