linux-kernel - [PATCH] f2fs: fix to clear unusable

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Message-ID: <20250807014836.3780988-1-chao@kernel.org>
Date: Thu,  7 Aug 2025 09:48:35 +0800
From: Chao Yu <chao@...nel.org>
To: jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	Chao Yu <chao@...nel.org>
Subject: [PATCH] f2fs: fix to clear unusable_cap for checkpoint=enable

mount -t f2fs -o checkpoint=disable:10% /dev/vdb /mnt/f2fs/
mount -t f2fs -o remount,checkpoint=enable /dev/vdb /mnt/f2fs/

kernel log:
F2FS-fs (vdb): Adjust unusable cap for checkpoint=disable = 204440 / 10%

If we has assigned checkpoint=enable mount option, unusable_cap{,_perc}
parameters of checkpoint=disable should be reset, then calculation and
log print could be avoid in adjust_unusable_cap_perc().

Fixes: 1ae18f71cb52 ("f2fs: fix checkpoint=disable:%u%%")
Signed-off-by: Chao Yu <chao@...nel.org>
---
 fs/f2fs/super.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index f37004780ce0..c1f45df9efec 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1014,6 +1014,10 @@ static int f2fs_parse_param(struct fs_context *fc, struct fs_parameter *param)
 			ctx_set_opt(ctx, F2FS_MOUNT_DISABLE_CHECKPOINT);
 			break;
 		case Opt_checkpoint_enable:
+			F2FS_CTX_INFO(ctx).unusable_cap_perc = 0;
+			ctx->spec_mask |= F2FS_SPEC_checkpoint_disable_cap_perc;
+			F2FS_CTX_INFO(ctx).unusable_cap = 0;
+			ctx->spec_mask |= F2FS_SPEC_checkpoint_disable_cap;
 			ctx_clear_opt(ctx, F2FS_MOUNT_DISABLE_CHECKPOINT);
 			break;
 		default:
-- 
2.49.0