From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
This creates the /sys/fs/<fs-type>/<s_id> directory.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
---
fs/super.c | 18 ++++++++++++++++++
include/linux/fs.h | 2 ++
2 files changed, 20 insertions(+)
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);
--
2.6.6
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