linux-kernel - [PATCH v2 1/5] f2fs: blocks need to belong to the same segment when using update_sit

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Message-ID: <20241030103136.2874140-2-yi.sun@unisoc.com>
Date: Wed, 30 Oct 2024 18:31:32 +0800
From: Yi Sun <yi.sun@...soc.com>
To: <chao@...nel.org>, <jaegeuk@...nel.org>
CC: <yi.sun@...soc.com>, <sunyibuaa@...il.com>,
        <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <niuzhiguo84@...il.com>,
        <hao_hao.wang@...soc.com>, <ke.wang@...soc.com>
Subject: [PATCH v2 1/5] f2fs: blocks need to belong to the same segment when using update_sit_entry()

When using update_sit_entry() to release consecutive blocks,
ensure that the consecutive blocks belong to the same segment.
Because after update_sit_entry_for_realese(), @segno is still
in use in update_sit_entry().

Signed-off-by: Yi Sun <yi.sun@...soc.com>
---
 fs/f2fs/segment.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index bb2fd98331cd..a5bd101c63a1 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2424,6 +2424,10 @@ static void update_segment_mtime(struct f2fs_sb_info *sbi, block_t blkaddr,
 		SIT_I(sbi)->max_mtime = ctime;
 }
 
+/*
+ * NOTE: when updating multiple blocks at the same time, please ensure
+ * that the consecutive input blocks belong to the same segment.
+ */
 static int update_sit_entry_for_release(struct f2fs_sb_info *sbi, struct seg_entry *se,
 				block_t blkaddr, unsigned int offset, int del)
 {
@@ -2434,6 +2438,8 @@ static int update_sit_entry_for_release(struct f2fs_sb_info *sbi, struct seg_ent
 	int i;
 	int del_count = -del;
 
+	f2fs_bug_on(sbi, GET_SEGNO(sbi, blkaddr) != GET_SEGNO(sbi, blkaddr + del_count - 1));
+
 	for (i = 0; i < del_count; i++) {
 		exist = f2fs_test_and_clear_bit(offset + i, se->cur_valid_map);
 #ifdef CONFIG_F2FS_CHECK_FS
@@ -2476,6 +2482,11 @@ static int update_sit_entry_for_release(struct f2fs_sb_info *sbi, struct seg_ent
 	return del;
 }
 
+/*
+ * If releasing blocks, this function supports updating multiple consecutive blocks
+ * at one time, but please note that these consecutive blocks need to belong to the
+ * same segment.
+ */
 static void update_sit_entry(struct f2fs_sb_info *sbi, block_t blkaddr, int del)
 {
 	struct seg_entry *se;
-- 
2.25.1