linux-kernel - [PATCH 2/2] f2fs: keep io_flags to avoid IO split due to different op

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Date:   Wed, 13 Apr 2022 08:49:20 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 2/2] f2fs: keep io_flags to avoid IO split due to different op_flags in two fio holders

Let's attach io_flags to bio only, so that we can merge IOs given original
io_flags only.

Fixes: 64bf0eef0171 ("f2fs: pass the bio operation to bio_alloc_bioset")
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/data.c | 33 +++++++++++++++++++++------------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index acc523f893ba..fcf0daa386de 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -387,11 +387,23 @@ int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
 	return 0;
 }
 
-static void __attach_io_flag(struct f2fs_io_info *fio, unsigned int io_flag)
+static unsigned int f2fs_io_flags(struct f2fs_io_info *fio)
 {
 	unsigned int temp_mask = (1 << NR_TEMP_TYPE) - 1;
-	unsigned int fua_flag = io_flag & temp_mask;
-	unsigned int meta_flag = (io_flag >> NR_TEMP_TYPE) & temp_mask;
+	unsigned int fua_flag, meta_flag, io_flag;
+	unsigned int op_flags = 0;
+
+	if (fio->op != REQ_OP_WRITE)
+		return 0;
+	if (fio->type == DATA)
+		io_flag = fio->sbi->data_io_flag;
+	else if (fio->type == NODE)
+		io_flag = fio->sbi->node_io_flag;
+	else
+		return 0;
+
+	fua_flag = io_flag & temp_mask;
+	meta_flag = (io_flag >> NR_TEMP_TYPE) & temp_mask;
 
 	/*
 	 * data/node io flag bits per temp:
@@ -400,9 +412,10 @@ static void __attach_io_flag(struct f2fs_io_info *fio, unsigned int io_flag)
 	 * Cold | Warm | Hot | Cold | Warm | Hot |
 	 */
 	if ((1 << fio->temp) & meta_flag)
-		fio->op_flags |= REQ_META;
+		op_flags |= REQ_META;
 	if ((1 << fio->temp) & fua_flag)
-		fio->op_flags |= REQ_FUA;
+		op_flags |= REQ_FUA;
+	return op_flags;
 }
 
 static struct bio *__bio_alloc(struct f2fs_io_info *fio, int npages)
@@ -412,14 +425,10 @@ static struct bio *__bio_alloc(struct f2fs_io_info *fio, int npages)
 	sector_t sector;
 	struct bio *bio;
 
-	if (fio->type == DATA)
-		__attach_io_flag(fio, sbi->data_io_flag);
-	else if (fio->type == NODE)
-		__attach_io_flag(fio, sbi->node_io_flag);
-
 	bdev = f2fs_target_device(sbi, fio->new_blkaddr, &sector);
-	bio = bio_alloc_bioset(bdev, npages, fio->op | fio->op_flags, GFP_NOIO,
-			       &f2fs_bioset);
+	bio = bio_alloc_bioset(bdev, npages,
+				fio->op | fio->op_flags | f2fs_io_flags(fio),
+				GFP_NOIO, &f2fs_bioset);
 	bio->bi_iter.bi_sector = sector;
 	if (is_read_io(fio->op)) {
 		bio->bi_end_io = f2fs_read_end_io;
-- 
2.36.0.rc0.470.gd361397f0d-goog