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| author | Daniel Rosenberg <drosen@google.com> | 2019-05-29 17:49:04 -0700 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2019-06-03 13:27:47 -0700 |
| commit | 9a9aecaad92d4fba0e2682ca6897d3a5aeabf123 (patch) | |
| tree | c0a391203640e804b34f369aa3d653eecb5eef9d /fs/f2fs | |
| parent | ae4ad7ea09d32ff1b6fb908ff12f8c1bd5241b29 (diff) | |
| download | linux-9a9aecaad92d4fba0e2682ca6897d3a5aeabf123.tar.gz linux-9a9aecaad92d4fba0e2682ca6897d3a5aeabf123.tar.bz2 linux-9a9aecaad92d4fba0e2682ca6897d3a5aeabf123.zip | |
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>
Diffstat (limited to 'fs/f2fs')
| -rw-r--r-- | fs/f2fs/super.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 1dc02101e5e5..4b547024571f 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -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) && |