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>

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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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fs/f2fs/super.c

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