From 9ed36a3b85e2934b511cd83374df8cd632fc4f7b Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Mon, 20 Apr 2020 16:02:21 -0400 Subject: [PATCH] ext2: fix missing percpu_counter_inc commit bc2fbaa4d3808aef82dd1064a8e61c16549fe956 upstream. sbi->s_freeinodes_counter is only decreased by the ext2 code, it is never increased. This patch fixes it. Note that sbi->s_freeinodes_counter is only used in the algorithm that tries to find the group for new allocations, so this bug is not easily visible (the only visibility is that the group finding algorithm selects inoptinal result). Link: https://lore.kernel.org/r/alpine.LRH.2.02.2004201538300.19436@file01.intranet.prod.int.rdu2.redhat.com Signed-off-by: Mikulas Patocka Cc: stable@vger.kernel.org Signed-off-by: Jan Kara Signed-off-by: Greg Kroah-Hartman --- fs/ext2/ialloc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c index efe5fb21c5332..d9ef354b821a2 100644 --- a/fs/ext2/ialloc.c +++ b/fs/ext2/ialloc.c @@ -79,6 +79,7 @@ static void ext2_release_inode(struct super_block *sb, int group, int dir) if (dir) le16_add_cpu(&desc->bg_used_dirs_count, -1); spin_unlock(sb_bgl_lock(EXT2_SB(sb), group)); + percpu_counter_inc(&EXT2_SB(sb)->s_freeinodes_counter); if (dir) percpu_counter_dec(&EXT2_SB(sb)->s_dirs_counter); mark_buffer_dirty(bh); @@ -525,7 +526,7 @@ got: goto fail; } - percpu_counter_add(&sbi->s_freeinodes_counter, -1); + percpu_counter_dec(&sbi->s_freeinodes_counter); if (S_ISDIR(mode)) percpu_counter_inc(&sbi->s_dirs_counter); -- 2.47.2