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Subject[PATCH] f2fs: fix to cover __allocate_new_section() with curseg_lock
Date
In order to avoid race with f2fs_do_replace_block().

Fixes: f5a53edcf01e ("f2fs: support aligned pinned file")
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/segment.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index e533192545b2..f1b0e832e7c2 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2957,19 +2957,23 @@ static void __allocate_new_section(struct f2fs_sb_info *sbi, int type)

void f2fs_allocate_new_section(struct f2fs_sb_info *sbi, int type)
{
+ down_read(&SM_I(sbi)->curseg_lock);
down_write(&SIT_I(sbi)->sentry_lock);
__allocate_new_section(sbi, type);
up_write(&SIT_I(sbi)->sentry_lock);
+ up_read(&SM_I(sbi)->curseg_lock);
}

void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi)
{
int i;

+ down_read(&SM_I(sbi)->curseg_lock);
down_write(&SIT_I(sbi)->sentry_lock);
for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++)
__allocate_new_segment(sbi, i, false);
up_write(&SIT_I(sbi)->sentry_lock);
+ up_read(&SM_I(sbi)->curseg_lock);
}

static const struct segment_allocation default_salloc_ops = {
--
2.29.2
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