f2fs: fix race between write_checkpoint and write_begin
[ Upstream commit 2866fb16d67992195b0526d19e65acb6640fb87f ] The following race could lead to inconsistent SIT bitmap: Task A Task B ====== ====== f2fs_write_checkpoint block_operations f2fs_lock_all down_write(node_change) down_write(node_write) ... sync ... up_write(node_change) f2fs_file_write_iter set_inode_flag(FI_NO_PREALLOC) ...... f2fs_write_begin(index=0, has inline data) prepare_write_begin __do_map_lock(AIO) => down_read(node_change) f2fs_convert_inline_page => update SIT __do_map_lock(AIO) => up_read(node_change) f2fs_flush_sit_entries <= inconsistent SIT finish write checkpoint sudden-power-off If SPO occurs after checkpoint is finished, SIT bitmap will be set incorrectly. Signed-off-by: NSheng Yong <shengyong1@huawei.com> Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: NSasha Levin <sashal@kernel.org>
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