linux-kernel - [PATCH 4/9] f2f2: replace some congestion_wait() calls with io_schedule

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Message-ID: <164325158957.29787.2116312603613564596.stgit@noble.brown>
Date:   Thu, 27 Jan 2022 13:46:29 +1100
From:   NeilBrown <neilb@...e.de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>,
        Jeff Layton <jlayton@...nel.org>,
        Ilya Dryomov <idryomov@...il.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        Ryusuke Konishi <konishi.ryusuke@...il.com>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Philipp Reisner <philipp.reisner@...bit.com>,
        Lars Ellenberg <lars.ellenberg@...bit.com>,
        Paolo Valente <paolo.valente@...aro.org>,
        Jens Axboe <axboe@...nel.dk>
Cc:     linux-mm@...ck.org, linux-nilfs@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, linux-ext4@...r.kernel.org,
        ceph-devel@...r.kernel.org, drbd-dev@...ts.linbit.com,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: [PATCH 4/9] f2f2: replace some congestion_wait() calls with
 io_schedule_timeout()

As congestion is no longer tracked, contestion_wait() is effectively
equivalent to io_schedule_timeout().
It isn't clear to me what these contestion_wait() calls are waiting
for, so I cannot change them to wait for some particular event.
So simply change them to io_schedule_timeout(), which will have
exactly the same behaviour.

Signed-off-by: NeilBrown <neilb@...e.de>
---
 fs/f2fs/segment.c |   14 ++++++++------
 fs/f2fs/super.c   |    8 ++++----
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1dabc8244083..78e3fbc24e77 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -313,8 +313,8 @@ void f2fs_drop_inmem_pages_all(struct f2fs_sb_info *sbi, bool gc_failure)
 skip:
 		iput(inode);
 	}
-	congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
-	cond_resched();
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	io_schedule_timeout(DEFAULT_IO_TIMEOUT);
 	if (gc_failure) {
 		if (++looped >= count)
 			return;
@@ -802,9 +802,10 @@ int f2fs_flush_device_cache(struct f2fs_sb_info *sbi)
 
 		do {
 			ret = __submit_flush_wait(sbi, FDEV(i).bdev);
-			if (ret)
-				congestion_wait(BLK_RW_ASYNC,
-						DEFAULT_IO_TIMEOUT);
+			if (ret) {
+				set_current_state(TASK_UNINTERRUPTIBLE);
+				io_schedule_timeout(DEFAULT_IO_TIMEOUT);
+			}
 		} while (ret && --count);
 
 		if (ret) {
@@ -3133,7 +3134,8 @@ static unsigned int __issue_discard_cmd_range(struct f2fs_sb_info *sbi,
 			blk_finish_plug(&plug);
 			mutex_unlock(&dcc->cmd_lock);
 			trimmed += __wait_all_discard_cmd(sbi, NULL);
-			congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
+			set_current_state(TASK_UNINTERRUPTIBLE);
+			io_schedule_timeout(DEFAULT_IO_TIMEOUT);
 			goto next;
 		}
 skip:
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 76e6a3df9aba..ae8dcbb71596 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2135,8 +2135,8 @@ static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
 	/* we should flush all the data to keep data consistency */
 	do {
 		sync_inodes_sb(sbi->sb);
-		cond_resched();
-		congestion_wait(BLK_RW_ASYNC, DEFAULT_IO_TIMEOUT);
+		set_current_state(TASK_UNINTERRUPTIBLE);
+		io_schedule_timeout(DEFAULT_IO_TIMEOUT);
 	} while (get_pages(sbi, F2FS_DIRTY_DATA) && retry--);
 
 	if (unlikely(retry < 0))
@@ -2504,8 +2504,8 @@ static ssize_t f2fs_quota_write(struct super_block *sb, int type,
 							&page, &fsdata);
 		if (unlikely(err)) {
 			if (err == -ENOMEM) {
-				congestion_wait(BLK_RW_ASYNC,
-						DEFAULT_IO_TIMEOUT);
+				set_current_state(TASK_UNINTERRUPTIBLE);
+				io_schedule_timeout(DEFAULT_IO_TIMEOUT);
 				goto retry;
 			}
 			set_sbi_flag(F2FS_SB(sb), SBI_QUOTA_NEED_REPAIR);