linux-ext4 - [PATCH 01/10] fs: Separate out kiocb flags setup based on RWF

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Date:   Wed, 24 May 2017 11:41:41 -0500
From:   Goldwyn Rodrigues <rgoldwyn@...e.de>
To:     linux-fsdevel@...r.kernel.org
Cc:     jack@...e.com, hch@...radead.org, linux-block@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, axboe@...nel.dk,
        linux-api@...r.kernel.org, adam.manzanares@....com,
        viro@...iv.linux.org.uk, Goldwyn Rodrigues <rgoldwyn@...e.com>
Subject: [PATCH 01/10] fs: Separate out kiocb flags setup based on RWF_* flags

From: Goldwyn Rodrigues <rgoldwyn@...e.com>

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@...e.com>
Reviewed-by: Christoph Hellwig <hch@....de>
---
 fs/read_write.c    | 12 +++---------
 include/linux/fs.h | 14 ++++++++++++++
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/fs/read_write.c b/fs/read_write.c
index 47c1d4484df9..53c816c61122 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -678,16 +678,10 @@ static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
 	struct kiocb kiocb;
 	ssize_t ret;
 
-	if (flags & ~(RWF_HIPRI | RWF_DSYNC | RWF_SYNC))
-		return -EOPNOTSUPP;
-
 	init_sync_kiocb(&kiocb, filp);
-	if (flags & RWF_HIPRI)
-		kiocb.ki_flags |= IOCB_HIPRI;
-	if (flags & RWF_DSYNC)
-		kiocb.ki_flags |= IOCB_DSYNC;
-	if (flags & RWF_SYNC)
-		kiocb.ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
+	ret = kiocb_set_rw_flags(&kiocb, flags);
+	if (ret)
+		return ret;
 	kiocb.ki_pos = *ppos;
 
 	if (type == READ)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 803e5a9b2654..f53867140f43 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3056,6 +3056,20 @@ static inline int iocb_flags(struct file *file)
 	return res;
 }
 
+static inline int kiocb_set_rw_flags(struct kiocb *ki, int flags)
+{
+	if (unlikely(flags & ~(RWF_HIPRI | RWF_DSYNC | RWF_SYNC)))
+		return -EOPNOTSUPP;
+
+	if (flags & RWF_HIPRI)
+		ki->ki_flags |= IOCB_HIPRI;
+	if (flags & RWF_DSYNC)
+		ki->ki_flags |= IOCB_DSYNC;
+	if (flags & RWF_SYNC)
+		ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
+	return 0;
+}
+
 static inline ino_t parent_ino(struct dentry *dentry)
 {
 	ino_t res;
-- 
2.12.0