diff mbox

[RFC,2/8] Add kobject to super_block

Message ID 1463076903-14373-3-git-send-email-rgoldwyn@suse.de (mailing list archive)
State New, archived
Headers show

Commit Message

Goldwyn Rodrigues May 12, 2016, 6:14 p.m. UTC 
From: Goldwyn Rodrigues <rgoldwyn@suse.com>

This creates the /sys/fs/<fs-type>/<s_id> directory.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 fs/super.c         | 18 ++++++++++++++++++
 include/linux/fs.h |  2 ++
 2 files changed, 20 insertions(+)
diff mbox

Patch

diff --git a/fs/super.c b/fs/super.c
index 74914b1..42568eb 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -414,6 +414,9 @@  void generic_shutdown_super(struct super_block *sb)
 		sync_filesystem(sb);
 		sb->s_flags &= ~MS_ACTIVE;
 
+		if (sb->s_type->sb_ktype)
+			kobject_put(&sb->s_kobj);
+
 		fsnotify_unmount_inodes(sb);
 		cgroup_writeback_umount();
 
@@ -427,6 +430,9 @@  void generic_shutdown_super(struct super_block *sb)
 		if (sop->put_super)
 			sop->put_super(sb);
 
+		if (sb->s_type->sb_ktype)
+			wait_for_completion(&sb->s_kobj_del);
+
 		if (!list_empty(&sb->s_inodes)) {
 			printk("VFS: Busy inodes after unmount of %s. "
 			   "Self-destruct in 5 seconds.  Have a nice day...\n",
@@ -1022,6 +1028,18 @@  struct dentry *mount_bdev(struct file_system_type *fs_type,
 			goto error;
 		}
 
+		if (fs_type->sb_ktype) {
+			s->s_kobj.kset = fs_type->kset;
+			init_completion(&s->s_kobj_del);
+			error = kobject_init_and_add(&s->s_kobj,
+					fs_type->sb_ktype,
+					NULL, "%s", s->s_id);
+			if (error) {
+				deactivate_locked_super(s);
+				goto error;
+			}
+		}
+
 		s->s_flags |= MS_ACTIVE;
 		bdev->bd_super = s;
 	}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 019546b..5ac8883 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1419,6 +1419,8 @@  struct super_block {
 	/* s_inode_list_lock protects s_inodes */
 	spinlock_t		s_inode_list_lock ____cacheline_aligned_in_smp;
 	struct list_head	s_inodes;	/* all inodes */
+	struct kobject		s_kobj;	    /* kobject to create /sys/fs/<type>/<s_id> */
+	struct completion	s_kobj_del; /* Wait for kobjects deletion */
 };
 
 extern struct timespec current_fs_time(struct super_block *sb);