From: Kirill Tkhai <tkhai@xxxxx>
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 <tkhai@xxxxx>
Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
---
mm/shmem.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/mm/shmem.c b/mm/shmem.c
index 71e6c9855770..a4c3fdf23838 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3930,6 +3930,12 @@ static void shmem_put_super(struct super_block *sb)
free_percpu(sbinfo->ino_batch);
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;
}
@@ -4018,6 +4024,7 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc)
failed:
shmem_put_super(sb);
+ shmem_destroy_super(sb);
return -ENOMEM;
}
@@ -4182,6 +4189,7 @@ 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_HUGEPAGE
.nr_cached_objects = shmem_unused_huge_count,
.free_cached_objects = shmem_unused_huge_scan,
--
2.30.2
