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ext2: fix missing percpu_counter_inc

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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 <mpatocka@redhat.com>
Cc: stable@vger.kernel.org

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Mikulas Patocka 2020-04-20 16:02:21 -04:00 committed by Jan Kara
parent a43850a380
commit bc2fbaa4d3
1 changed files with 2 additions and 1 deletions
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3
fs/ext2/ialloc.c
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@ -80,6 +80,7 @@ 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);
@ -528,7 +529,7 @@ struct inode *ext2_new_inode(struct inode *dir, umode_t mode,
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);