From d5100272e478751a22f1dd7e059de97dde04c943 Mon Sep 17 00:00:00 2001 From: Zhang Qilong Date: Tue, 18 Oct 2022 10:45:32 +0800 Subject: [PATCH] f2fs: Fix the race condition of resize flag between resizefs [ Upstream commit 28fc4e9077ce59ab28c89c20dc6be5154473218f ] Because the set/clear SBI_IS_RESIZEFS flag not between any locks, In the following case: thread1 thread2 ->ioctl(resizefs) ->set RESIZEFS flag ->ioctl(resizefs) ... ->set RESIZEFS flag ->clear RESIZEFS flag ->resizefs stream # No RESIZEFS flag in the stream Also before freeze_super, the resizefs not started, we should not set the SBI_IS_RESIZEFS flag. So move the set/clear SBI_IS_RESIZEFS flag between the cp_mutex and gc_lock. Fixes: b4b10061ef98 ("f2fs: refactor resize_fs to avoid meta updates in progress") Signed-off-by: Zhang Xiaoxu Signed-off-by: Zhang Qilong Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/gc.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c index e75a276f5b9c7..4cbaa6ab083f0 100644 --- a/fs/f2fs/gc.c +++ b/fs/f2fs/gc.c @@ -2051,8 +2051,6 @@ out_unlock: if (err) return err; - set_sbi_flag(sbi, SBI_IS_RESIZEFS); - freeze_super(sbi->sb); down_write(&sbi->gc_lock); down_write(&sbi->cp_global_sem); @@ -2068,6 +2066,7 @@ out_unlock: if (err) goto out_err; + set_sbi_flag(sbi, SBI_IS_RESIZEFS); err = free_segment_range(sbi, secs, false); if (err) goto recover_out; @@ -2091,6 +2090,7 @@ out_unlock: f2fs_commit_super(sbi, false); } recover_out: + clear_sbi_flag(sbi, SBI_IS_RESIZEFS); if (err) { set_sbi_flag(sbi, SBI_NEED_FSCK); f2fs_err(sbi, "resize_fs failed, should run fsck to repair!"); @@ -2103,6 +2103,5 @@ out_err: up_write(&sbi->cp_global_sem); up_write(&sbi->gc_lock); thaw_super(sbi->sb); - clear_sbi_flag(sbi, SBI_IS_RESIZEFS); return err; } -- 2.30.2