FROMGIT: f2fs: add ioctl to get IO priority hint
This patch adds an ioctl to give a per-file priority hint to attach REQ_PRIO. Bug: 325443469 Reviewed-by:Chao Yu <chao@kernel.org> Change-Id: I5110e1fc295e4e1bc3a302b75b92050bfc17059b Signed-off-by:
Jaegeuk Kim <jaegeuk@kernel.org> (cherry picked from commit 5f95c181 https: //git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/ dev)
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