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fs: optimise kiocb_set_rw_flags()

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Use a local var to collect flags in kiocb_set_rw_flags(). That spares
some memory writes and allows to replace most of the jumps with MOVEcc.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-08-01 13:36:33 +03:00 committed by Jens Axboe
parent d1719f70d0
commit 1752f0adea
1 changed files with 11 additions and 5 deletions
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16
include/linux/fs.h
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@ -3446,22 +3446,28 @@ static inline int iocb_flags(struct file *file)
static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags)
{
int kiocb_flags = 0;
if (!flags)
return 0;
if (unlikely(flags & ~RWF_SUPPORTED))
return -EOPNOTSUPP;
if (flags & RWF_NOWAIT) {
if (!(ki->ki_filp->f_mode & FMODE_NOWAIT))
return -EOPNOTSUPP;
ki->ki_flags |= IOCB_NOWAIT;
kiocb_flags |= IOCB_NOWAIT;
}
if (flags & RWF_HIPRI)
ki->ki_flags |= IOCB_HIPRI;
kiocb_flags |= IOCB_HIPRI;
if (flags & RWF_DSYNC)
ki->ki_flags |= IOCB_DSYNC;
kiocb_flags |= IOCB_DSYNC;
if (flags & RWF_SYNC)
ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
kiocb_flags |= (IOCB_DSYNC | IOCB_SYNC);
if (flags & RWF_APPEND)
ki->ki_flags |= IOCB_APPEND;
kiocb_flags |= IOCB_APPEND;
ki->ki_flags |= kiocb_flags;
return 0;
}