Patch "f2fs: flush error flags in workqueue" has been added to the 6.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    f2fs: flush error flags in workqueue

to the 6.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     f2fs-flush-error-flags-in-workqueue.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 035e390ae87a76513a9f15eb3a72e30a0f11ca8f
Author: Chao Yu <chao@xxxxxxxxxx>
Date:   Thu May 18 10:14:12 2023 +0800

    f2fs: flush error flags in workqueue
    
    [ Upstream commit 901c12d144570ed2558f4a6806201453c5b01bea ]
    
    In IRQ context, it wakes up workqueue to record errors into on-disk
    superblock fields rather than in-memory fields.
    
    Fixes: 1aa161e43106 ("f2fs: fix scheduling while atomic in decompression path")
    Fixes: 95fa90c9e5a7 ("f2fs: support recording errors into superblock")
    Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
    Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 905b7c39a2b32..1132d3cd8f337 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -744,7 +744,7 @@ void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task)
 
 		/* Avoid f2fs_commit_super in irq context */
 		if (!in_task)
-			f2fs_save_errors(sbi, ERROR_FAIL_DECOMPRESSION);
+			f2fs_handle_error_async(sbi, ERROR_FAIL_DECOMPRESSION);
 		else
 			f2fs_handle_error(sbi, ERROR_FAIL_DECOMPRESSION);
 		goto out_release;
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 35a025d7e305b..d867056a01f65 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3558,6 +3558,7 @@ void f2fs_save_errors(struct f2fs_sb_info *sbi, unsigned char flag);
 void f2fs_handle_critical_error(struct f2fs_sb_info *sbi, unsigned char reason,
 							bool irq_context);
 void f2fs_handle_error(struct f2fs_sb_info *sbi, unsigned char error);
+void f2fs_handle_error_async(struct f2fs_sb_info *sbi, unsigned char error);
 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover);
 int f2fs_sync_fs(struct super_block *sb, int sync);
 int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 51812f4595813..17082dc3c1a34 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -3980,6 +3980,11 @@ static void f2fs_record_stop_reason(struct f2fs_sb_info *sbi)
 	f2fs_down_write(&sbi->sb_lock);
 
 	spin_lock_irqsave(&sbi->error_lock, flags);
+	if (sbi->error_dirty) {
+		memcpy(F2FS_RAW_SUPER(sbi)->s_errors, sbi->errors,
+							MAX_F2FS_ERRORS);
+		sbi->error_dirty = false;
+	}
 	memcpy(raw_super->s_stop_reason, sbi->stop_reason, MAX_STOP_REASON);
 	spin_unlock_irqrestore(&sbi->error_lock, flags);
 
@@ -4019,12 +4024,10 @@ static bool f2fs_update_errors(struct f2fs_sb_info *sbi)
 	return need_update;
 }
 
-void f2fs_handle_error(struct f2fs_sb_info *sbi, unsigned char error)
+static void f2fs_record_errors(struct f2fs_sb_info *sbi, unsigned char error)
 {
 	int err;
 
-	f2fs_save_errors(sbi, error);
-
 	f2fs_down_write(&sbi->sb_lock);
 
 	if (!f2fs_update_errors(sbi))
@@ -4038,6 +4041,23 @@ void f2fs_handle_error(struct f2fs_sb_info *sbi, unsigned char error)
 	f2fs_up_write(&sbi->sb_lock);
 }
 
+void f2fs_handle_error(struct f2fs_sb_info *sbi, unsigned char error)
+{
+	f2fs_save_errors(sbi, error);
+	f2fs_record_errors(sbi, error);
+}
+
+void f2fs_handle_error_async(struct f2fs_sb_info *sbi, unsigned char error)
+{
+	f2fs_save_errors(sbi, error);
+
+	if (!sbi->error_dirty)
+		return;
+	if (!test_bit(error, (unsigned long *)sbi->errors))
+		return;
+	schedule_work(&sbi->s_error_work);
+}
+
 static bool system_going_down(void)
 {
 	return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF