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f2fs: Fix the race condition of resize flag between resizefs

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[ Upstream commit 28fc4e9077 ]

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: b4b10061ef ("f2fs: refactor resize_fs to avoid meta updates in progress")
Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhang Qilong 2022-10-18 10:45:32 +08:00 committed by Greg Kroah-Hartman
parent 0ea2ba0d5b
commit 1550e87112
1 changed files with 2 additions and 3 deletions
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5
fs/f2fs/gc.c
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@ -2133,8 +2133,6 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
if (err)
return err;
set_sbi_flag(sbi, SBI_IS_RESIZEFS);
freeze_super(sbi->sb);
f2fs_down_write(&sbi->gc_lock);
f2fs_down_write(&sbi->cp_global_sem);
@ -2150,6 +2148,7 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
if (err)
goto out_err;
set_sbi_flag(sbi, SBI_IS_RESIZEFS);
err = free_segment_range(sbi, secs, false);
if (err)
goto recover_out;
@ -2173,6 +2172,7 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
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!");
@ -2185,6 +2185,5 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
f2fs_up_write(&sbi->cp_global_sem);
f2fs_up_write(&sbi->gc_lock);
thaw_super(sbi->sb);
clear_sbi_flag(sbi, SBI_IS_RESIZEFS);
return err;
}