linux-kernel - [PATCH] f2fs: fix to check result of new_curseg in f2fs_allocate_segment_for

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Date: Fri, 1 Mar 2024 19:36:16 +0800
From: Zhiguo Niu <zhiguo.niu@...soc.com>
To: <jaegeuk@...nel.org>, <chao@...nel.org>
CC: <linux-f2fs-devel@...ts.sourceforge.net>, <linux-kernel@...r.kernel.org>,
        <niuzhiguo84@...il.com>, <zhiguo.niu@...soc.com>, <ke.wang@...soc.com>,
        <hongyu.jin@...soc.com>
Subject: [PATCH] f2fs: fix to check result of new_curseg in f2fs_allocate_segment_for_resize

new_curseg may return error if get_new_segment fail, so its result
should be check in its caller f2fs_allocate_segment_for_resize,
alos pass this results to free_segment_range.

Signed-off-by: Zhiguo Niu <zhiguo.niu@...soc.com>
---
 fs/f2fs/f2fs.h    | 2 +-
 fs/f2fs/gc.c      | 7 +++++--
 fs/f2fs/segment.c | 9 +++++++--
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 4331012..39dda7d 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3701,7 +3701,7 @@ void f2fs_clear_prefree_segments(struct f2fs_sb_info *sbi,
 void f2fs_init_inmem_curseg(struct f2fs_sb_info *sbi);
 void f2fs_save_inmem_curseg(struct f2fs_sb_info *sbi);
 void f2fs_restore_inmem_curseg(struct f2fs_sb_info *sbi);
-void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
+int f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
 					unsigned int start, unsigned int end);
 int f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type, bool force);
 int f2fs_allocate_pinning_section(struct f2fs_sb_info *sbi);
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index c60b747..7a458fa 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -2037,8 +2037,11 @@ static int free_segment_range(struct f2fs_sb_info *sbi,
 	mutex_unlock(&DIRTY_I(sbi)->seglist_lock);
 
 	/* Move out cursegs from the target range */
-	for (type = CURSEG_HOT_DATA; type < NR_CURSEG_PERSIST_TYPE; type++)
-		f2fs_allocate_segment_for_resize(sbi, type, start, end);
+	for (type = CURSEG_HOT_DATA; type < NR_CURSEG_PERSIST_TYPE; type++) {
+		err = f2fs_allocate_segment_for_resize(sbi, type, start, end);
+		if (err)
+			goto out;
+	}
 
 	/* do GC to move out valid blocks in the range */
 	err = f2fs_gc_range(sbi, start, end, dry_run, 0);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1bb3019..2a07b9d 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3071,11 +3071,12 @@ static bool need_new_seg(struct f2fs_sb_info *sbi, int type)
 	return false;
 }
 
-void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
+int f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
 					unsigned int start, unsigned int end)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
 	unsigned int segno;
+	int err = 0;
 
 	f2fs_down_read(&SM_I(sbi)->curseg_lock);
 	mutex_lock(&curseg->curseg_mutex);
@@ -3089,7 +3090,10 @@ void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
 		change_curseg(sbi, type);
 	else
 		new_curseg(sbi, type, true);
-
+	if (curseg->segno == NULL_SEGNO) {
+		err = -ENOSPC;
+		goto unlock;
+	}
 	stat_inc_seg_type(sbi, curseg);
 
 	locate_dirty_segment(sbi, segno);
@@ -3102,6 +3106,7 @@ void f2fs_allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
 
 	mutex_unlock(&curseg->curseg_mutex);
 	f2fs_up_read(&SM_I(sbi)->curseg_lock);
+	return err;
 }
 
 static int __allocate_new_segment(struct f2fs_sb_info *sbi, int type,
-- 
1.9.1