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Revert "kernfs: remove kernfs_addrm_cxt"

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This reverts commit 99177a3411.

Tejun writes:
        I'm sorry but can you please revert the whole series?
        get_active() waiting while a node is deactivated has potential
        to lead to deadlock and that deactivate/reactivate interface is
        something fundamentally flawed and that cgroup will have to work
        with the remove_self() like everybody else.  IOW, I think the
        first posting was correct.

Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2014-01-13 14:20:56 -08:00
parent f4b3e631b3
commit 7653fe9d6c
5 changed files with 121 additions and 29 deletions
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12
fs/kernfs/kernfs-internal.h
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@ -45,6 +45,13 @@ static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
return kn->dir.root;
}
/*
* Context structure to be used while adding/removing nodes.
*/
struct kernfs_addrm_cxt {
struct kernfs_node *removed;
};
/*
* mount.c
*/
@ -94,7 +101,10 @@ extern const struct inode_operations kernfs_dir_iops;
struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
void kernfs_put_active(struct kernfs_node *kn);
int kernfs_add_one(struct kernfs_node *kn, struct kernfs_node *parent);
void kernfs_addrm_start(struct kernfs_addrm_cxt *acxt);
int kernfs_add_one(struct kernfs_addrm_cxt *acxt, struct kernfs_node *kn,
struct kernfs_node *parent);
void kernfs_addrm_finish(struct kernfs_addrm_cxt *acxt);
struct kernfs_node *kernfs_new_node(struct kernfs_root *root, const char *name,
umode_t mode, unsigned flags);