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kill kernfs_pin_sb()

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unused now and impossible to use safely anyway.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-01-17 12:02:57 -05:00
parent 35ac118424
commit 6d7fbce7da
2 changed files with 0 additions and 31 deletions
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30
fs/kernfs/mount.c
View File

@ -377,36 +377,6 @@ void kernfs_kill_sb(struct super_block *sb)
kfree(info); 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) void __init kernfs_init(void)
{ {

1
include/linux/kernfs.h
View File

@ -357,7 +357,6 @@ struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags,
struct kernfs_root *root, unsigned long magic, struct kernfs_root *root, unsigned long magic,
bool *new_sb_created, const void *ns); bool *new_sb_created, const void *ns);
void kernfs_kill_sb(struct super_block *sb); 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); void kernfs_init(void);