linux-kernel - [PATCH] f2fs: prevent atomic file from being dirtied before commit

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Message-ID: <20240904151054.813444-1-daeho43@gmail.com>
Date: Wed,  4 Sep 2024 08:10:54 -0700
From: Daeho Jeong <daeho43@...il.com>
To: linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	kernel-team@...roid.com
Cc: Daeho Jeong <daehojeong@...gle.com>
Subject: [PATCH] f2fs: prevent atomic file from being dirtied before commit

From: Daeho Jeong <daehojeong@...gle.com>

Keep atomic file clean while updating and make it dirtied during commit
in order to avoid unnecessary and excessive inode updates in the previous
fix.

Fixes: 4bf78322346f ("f2fs: mark inode dirty for FI_ATOMIC_COMMITTED flag")
Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
---
v2: take the original logic not to change inode size by inode dirtying
    from VFS layer
---
 fs/f2fs/f2fs.h    | 2 +-
 fs/f2fs/inode.c   | 5 +++++
 fs/f2fs/segment.c | 8 ++++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ac19c61f0c3e..4ef6d877aa36 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -802,6 +802,7 @@ enum {
 	FI_ALIGNED_WRITE,	/* enable aligned write */
 	FI_COW_FILE,		/* indicate COW file */
 	FI_ATOMIC_COMMITTED,	/* indicate atomic commit completed except disk sync */
+	FI_ATOMIC_DIRTIED,	/* indicate atomic file is dirtied */
 	FI_ATOMIC_REPLACE,	/* indicate atomic replace */
 	FI_OPENED_FILE,		/* indicate file has been opened */
 	FI_MAX,			/* max flag, never be used */
@@ -3041,7 +3042,6 @@ static inline void __mark_inode_dirty_flag(struct inode *inode,
 	case FI_INLINE_DOTS:
 	case FI_PIN_FILE:
 	case FI_COMPRESS_RELEASED:
-	case FI_ATOMIC_COMMITTED:
 		f2fs_mark_inode_dirty_sync(inode, true);
 	}
 }
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index aef57172014f..4729c49bf6d7 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -35,6 +35,11 @@ void f2fs_mark_inode_dirty_sync(struct inode *inode, bool sync)
 	if (f2fs_inode_dirtied(inode, sync))
 		return;
 
+	if (f2fs_is_atomic_file(inode)) {
+		set_inode_flag(inode, FI_ATOMIC_DIRTIED);
+		return;
+	}
+
 	mark_inode_dirty_sync(inode);
 }
 
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 78c3198a6308..2f6ee9afd3ad 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -199,6 +199,10 @@ void f2fs_abort_atomic_write(struct inode *inode, bool clean)
 	clear_inode_flag(inode, FI_ATOMIC_COMMITTED);
 	clear_inode_flag(inode, FI_ATOMIC_REPLACE);
 	clear_inode_flag(inode, FI_ATOMIC_FILE);
+	if (is_inode_flag_set(inode, FI_ATOMIC_DIRTIED)) {
+		clear_inode_flag(inode, FI_ATOMIC_DIRTIED);
+		f2fs_mark_inode_dirty_sync(inode, true);
+	}
 	stat_dec_atomic_inode(inode);
 
 	F2FS_I(inode)->atomic_write_task = NULL;
@@ -366,6 +370,10 @@ static int __f2fs_commit_atomic_write(struct inode *inode)
 	} else {
 		sbi->committed_atomic_block += fi->atomic_write_cnt;
 		set_inode_flag(inode, FI_ATOMIC_COMMITTED);
+		if (is_inode_flag_set(inode, FI_ATOMIC_DIRTIED)) {
+			clear_inode_flag(inode, FI_ATOMIC_DIRTIED);
+			f2fs_mark_inode_dirty_sync(inode, true);
+		}
 	}
 
 	__complete_revoke_list(inode, &revoke_list, ret ? true : false);
-- 
2.46.0.469.g59c65b2a67-goog