linux-kernel - [PATCH] nilfs2: remove wbc->for

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Message-ID: <20250516123417.6779-1-konishi.ryusuke@gmail.com>
Date: Fri, 16 May 2025 21:31:13 +0900
From: Ryusuke Konishi <konishi.ryusuke@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-nilfs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@....de>
Subject: [PATCH] nilfs2: remove wbc->for_reclaim handling

From: Christoph Hellwig <hch@....de>

Since commit 013a07052a1a ("nilfs2: convert metadata aops from writepage
to writepages"), nilfs_mdt_write_folio can't be called from reclaim
context any more.  Remove the code keyed of the wbc->for_reclaim flag,
which is now only set for writing out swap or shmem pages inside the
swap code, but never passed to file systems.

Link: https://lkml.kernel.org/r/20250508054938.15894-7-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@...il.com>
---
Andrew, please add this to the queue for the next merge cycle.

This removes dead code on nilfs2 regarding the for_reclaim flag in
writeback control.  It is part of Christoph's series "stop passing a
writeback_control to swap/shmem writeout", but I'm sending it ahead
separately at his request.

Thanks,
Ryusuke Konishi

 fs/nilfs2/mdt.c     |  2 --
 fs/nilfs2/segment.c | 16 ----------------
 fs/nilfs2/segment.h |  1 -
 3 files changed, 19 deletions(-)

diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 2f850a18d6e7..946b0d3534a5 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -422,8 +422,6 @@ static int nilfs_mdt_write_folio(struct folio *folio,
 
 	if (wbc->sync_mode == WB_SYNC_ALL)
 		err = nilfs_construct_segment(sb);
-	else if (wbc->for_reclaim)
-		nilfs_flush_segment(sb, inode->i_ino);
 
 	return err;
 }
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 83970d97840b..61a4141f8d6b 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -2221,22 +2221,6 @@ static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn)
 	spin_unlock(&sci->sc_state_lock);
 }
 
-/**
- * nilfs_flush_segment - trigger a segment construction for resource control
- * @sb: super block
- * @ino: inode number of the file to be flushed out.
- */
-void nilfs_flush_segment(struct super_block *sb, ino_t ino)
-{
-	struct the_nilfs *nilfs = sb->s_fs_info;
-	struct nilfs_sc_info *sci = nilfs->ns_writer;
-
-	if (!sci || nilfs_doing_construction())
-		return;
-	nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0);
-					/* assign bit 0 to data files */
-}
-
 struct nilfs_segctor_wait_request {
 	wait_queue_entry_t	wq;
 	__u32		seq;
diff --git a/fs/nilfs2/segment.h b/fs/nilfs2/segment.h
index f723f47ddc4e..4b39ed43ae72 100644
--- a/fs/nilfs2/segment.h
+++ b/fs/nilfs2/segment.h
@@ -226,7 +226,6 @@ extern void nilfs_relax_pressure_in_lock(struct super_block *);
 extern int nilfs_construct_segment(struct super_block *);
 extern int nilfs_construct_dsync_segment(struct super_block *, struct inode *,
 					 loff_t, loff_t);
-extern void nilfs_flush_segment(struct super_block *, ino_t);
 extern int nilfs_clean_segments(struct super_block *, struct nilfs_argv *,
 				void **);
 
-- 
2.43.0