[PATCH 03/43] kill kernfs_pin_sb()
From: David Howells <dhowells@redhat.com>
Date: 2019-02-19 16:28:35
Also in:
linux-fsdevel
Subsystem:
filesystems (vfs and infrastructure), kernfs, the rest · Maintainers:
Alexander Viro, Christian Brauner, Greg Kroah-Hartman, Tejun Heo, Linus Torvalds
From: Al Viro <viro@zeniv.linux.org.uk> unused now and impossible to use safely anyway. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> --- fs/kernfs/mount.c | 30 ------------------------------ include/linux/kernfs.h | 1 - 2 files changed, 31 deletions(-)
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index d71c9405874a..4d303047a4f8 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c@@ -377,36 +377,6 @@ void kernfs_kill_sb(struct super_block *sb) kfree(info); } -/** - * kernfs_pin_sb: try to pin the superblock associated with a kernfs_root - * @kernfs_root: the kernfs_root in question - * @ns: the namespace tag - * - * Pin the superblock so the superblock won't be destroyed in subsequent - * operations. This can be used to block ->kill_sb() which may be useful - * for kernfs users which dynamically manage superblocks. - * - * Returns NULL if there's no superblock associated to this kernfs_root, or - * -EINVAL if the superblock is being freed. - */ -struct super_block *kernfs_pin_sb(struct kernfs_root *root, const void *ns) -{ - struct kernfs_super_info *info; - struct super_block *sb = NULL; - - mutex_lock(&kernfs_mutex); - list_for_each_entry(info, &root->supers, node) { - if (info->ns == ns) { - sb = info->sb; - if (!atomic_inc_not_zero(&info->sb->s_active)) - sb = ERR_PTR(-EINVAL); - break; - } - } - mutex_unlock(&kernfs_mutex); - return sb; -} - void __init kernfs_init(void) {
diff --git a/include/linux/kernfs.h b/include/linux/kernfs.h
index 5b36b1287a5a..44acb4c3659c 100644
--- a/include/linux/kernfs.h
+++ b/include/linux/kernfs.h@@ -357,7 +357,6 @@ struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags, struct kernfs_root *root, unsigned long magic, bool *new_sb_created, const void *ns); void kernfs_kill_sb(struct super_block *sb); -struct super_block *kernfs_pin_sb(struct kernfs_root *root, const void *ns); void kernfs_init(void);