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f2fs: Fix root reserved on remount

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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>
This commit is contained in:
Daniel Rosenberg 2019-05-29 17:49:04 -07:00 committed by Jaegeuk Kim
parent ae4ad7ea09
commit 9a9aecaad9
1 changed files with 2 additions and 1 deletions
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3
fs/f2fs/super.c
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@ -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) &&