diff mbox series

[7/8] shmem: implement shmem_destroy_super()

Message ID 20230531095742.2480623-8-qi.zheng@linux.dev
State New
Headers
Series make unregistration of super_block shrinker more faster |

Commit Message

Qi Zheng May 31, 2023, 9:57 a.m. UTC 
  From: Kirill Tkhai <tkhai@ya.ru>

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@ya.ru>
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
---
 mm/shmem.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

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,