[PATCH 5.19 115/717] f2fs: increase the limit for reserve_root

Greg Kroah-Hartman
2022-10-22T07:42:42Z

From: Jaegeuk Kim <jaegeuk@kernel.org>

commit da35fe96d12d15779f3cb74929b7ed03941cf983 upstream.

This patch increases the threshold that limits the reserved root space from 0.2%
to 12.5% by using simple shift operation.

Typically Android sets 128MB, but if the storage capacity is 32GB, 0.2% which is
around 64MB becomes too small. Let's relax it.

Cc: stable@vger.kernel.org
Reported-by: Aran Dalton <arda@allwinnertech.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/f2fs/super.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -298,10 +298,10 @@ static void f2fs_destroy_casefold_cache(

static inline void limit_reserve_root(struct f2fs_sb_info *sbi)
{
- block_t limit = min((sbi->user_block_count << 1) / 1000,
+ block_t limit = min((sbi->user_block_count >> 3),
sbi->user_block_count - sbi->reserved_blocks);

- /* limit is 0.2% */
+ /* limit is 12.5% */
if (test_opt(sbi, RESERVE_ROOT) &&
F2FS_OPTION(sbi).root_reserved_blocks > limit) {
F2FS_OPTION(sbi).root_reserved_blocks = limit;