linux-kernel - [PATCH v0] f2fs: allow direct read for zoned device

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Message-ID: <20220729002517epcms2p35eed262c3349287436c1848ab350c2d4@epcms2p3>
Date:   Fri, 29 Jul 2022 09:25:17 +0900
From:   Eunhee Rho <eunhee83.rho@...sung.com>
To:     "jaegeuk@...nel.org" <jaegeuk@...nel.org>,
        "chao@...nel.org" <chao@...nel.org>,
        "linux-f2fs-devel@...ts.sourceforge.net" 
        <linux-f2fs-devel@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Eunhee Rho <eunhee83.rho@...sung.com>
Subject: [PATCH v0] f2fs: allow direct read for zoned device

For zoned devices, f2fs forbids direct IO and forces buffered IO
to serialize write IOs. However, the constraint does not apply to
read IOs.

Signed-off-by: Eunhee Rho <eunhee83.rho@...sung.com>
---
 fs/f2fs/f2fs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index d0f428aef34b..f69731f17402 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -4471,7 +4471,7 @@ static inline bool f2fs_force_buffered_io(struct inode *inode,
 	 * for blkzoned device, fallback direct IO to buffered IO, so
 	 * all IOs can be serialized by log-structured write.
 	 */
-	if (f2fs_sb_has_blkzoned(sbi))
+	if (f2fs_sb_has_blkzoned(sbi) && (rw == WRITE))
 		return true;
 	if (f2fs_lfs_mode(sbi) && (rw == WRITE)) {
 		if (block_unaligned_IO(inode, iocb, iter))
-- 
2.25.1