Commit b7473754 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: avoid race for summary information 



In order to do GC more reliably, I'd like to lock the vicitm summary page
until its GC is completed, and also prevent any checkpoint process.

Reviewed-by: default avatarNamjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 60374688

fs/f2fs/gc.c

+1 −7
Original line number Diff line number Diff line
@@ -642,12 +642,6 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno, 
	if (IS_ERR(sum_page))

		return;



	/*

	 * CP needs to lock sum_page. In this time, we don't need

	 * to lock this page, because this summary page is not gone anywhere.

	 * Also, this page is not gonna be updated before GC is done.

	 */

	unlock_page(sum_page);

	sum = page_address(sum_page);



	switch (GET_SUM_TYPE((&sum->footer))) {
@@ -661,7 +655,7 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno, 
	stat_inc_seg_count(sbi, GET_SUM_TYPE((&sum->footer)));

	stat_inc_call_count(sbi->stat_info);



	f2fs_put_page(sum_page, 0);

	f2fs_put_page(sum_page, 1);

}



int f2fs_gc(struct f2fs_sb_info *sbi)

fs/f2fs/node.c

+1 −1
Original line number Diff line number Diff line
@@ -1149,7 +1149,7 @@ static int f2fs_write_node_pages(struct address_space *mapping, 


	/* First check balancing cached NAT entries */

	if (try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK)) {

		write_checkpoint(sbi, false);

		f2fs_sync_fs(sbi->sb, true);

		return 0;

	}

fs/f2fs/super.c

+5 −2
Original line number Diff line number Diff line
@@ -137,10 +137,13 @@ int f2fs_sync_fs(struct super_block *sb, int sync) 
	if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))

		return 0;



	if (sync)

	if (sync) {

		mutex_lock(&sbi->gc_mutex);

		write_checkpoint(sbi, false);

	else

		mutex_unlock(&sbi->gc_mutex);

	} else {

		f2fs_balance_fs(sbi);

	}



	return 0;

}