Commit 9a9aecaa authored May 29, 2019 by Daniel Rosenberg Committed by Jaegeuk Kim Jun 03, 2019

f2fs: Fix root reserved on remount



On a remount, you can currently set root reserved if it was not
previously set. This can cause an underflow if reserved has been set to
a very high value, since then root reserved + current reserved could be
greater than user_block_count. inc_valid_block_count later subtracts out
these values from user_block_count, causing an underflow.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent ae4ad7ea

fs/f2fs/super.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -213,7 +213,8 @@ void f2fs_msg(struct super_block sb, const char level, const char *fmt, ...)

		static inline void limit_reserve_root(struct f2fs_sb_info *sbi)
		{
		block_t limit = (sbi->user_block_count << 1) / 1000;
		block_t limit = min((sbi->user_block_count << 1) / 1000,
		sbi->user_block_count - sbi->reserved_blocks);

		/* limit is 0.2% */
		if (test_opt(sbi, RESERVE_ROOT) &&

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