Similar to xfs_fs_destroy_super() implement the method for shmem. shmem_unused_huge_count() just touches sb->s_fs_info. After such the later freeing it will be safe for unregister_shrinker() splitting (which is made in next patch).
Signed-off-by: Kirill Tkhai <[email protected]> --- mm/shmem.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/mm/shmem.c b/mm/shmem.c index 4829798869b6..35c65afefbc8 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -3427,6 +3427,12 @@ static void shmem_put_super(struct super_block *sb) percpu_counter_destroy(&sbinfo->used_blocks); mpol_put(sbinfo->mpol); +} + +static void shmem_destroy_super(struct super_block *sb) +{ + struct shmem_sb_info *sbinfo = SHMEM_SB(sb); + kfree(sbinfo); sb->s_fs_info = NULL; } @@ -3504,6 +3510,7 @@ int shmem_fill_super(struct super_block *sb, void *data, size_t data_size, failed: shmem_put_super(sb); + shmem_destroy_super(sb); return err; } @@ -3630,6 +3637,7 @@ static const struct super_operations shmem_ops = { .evict_inode = shmem_evict_inode, .drop_inode = generic_delete_inode, .put_super = shmem_put_super, + .destroy_super = shmem_destroy_super, #ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE .nr_cached_objects = shmem_unused_huge_count, .free_cached_objects = shmem_unused_huge_scan,
