On Wed, 2018-03-14 at 19:48 -0700, Matthew Wilcox wrote:
> Allocate the owner_id when we allocate the state and free it when we free
> the state. That lets us get rid of a gnarly ida_pre_get() / ida_get_new()
> loop.
>
> Signed-off-by: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx>
>
> diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
> index 91a4d4eeb235..c10a422efe6f 100644
> --- a/fs/nfs/nfs4state.c
> +++ b/fs/nfs/nfs4state.c
> @@ -428,7 +428,6 @@ nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
> struct rb_node **p = &server->state_owners.rb_node,
> *parent = NULL;
> struct nfs4_state_owner *sp;
> - int err;
>
> while (*p != NULL) {
> parent = *p;
> @@ -445,9 +444,6 @@ nfs4_insert_state_owner_locked(struct nfs4_state_owner *new)
> return sp;
> }
> }
> - err = ida_get_new(&server->openowner_id, &new->so_seqid.owner_id);
> - if (err)
> - return ERR_PTR(err);
> rb_link_node(&new->so_server_node, parent, p);
> rb_insert_color(&new->so_server_node, &server->state_owners);
> return new;
> @@ -460,7 +456,6 @@ nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp)
>
> if (!RB_EMPTY_NODE(&sp->so_server_node))
> rb_erase(&sp->so_server_node, &server->state_owners);
> - ida_remove(&server->openowner_id, sp->so_seqid.owner_id);
> }
>
> static void
> @@ -495,6 +490,12 @@ nfs4_alloc_state_owner(struct nfs_server *server,
> sp = kzalloc(sizeof(*sp), gfp_flags);
> if (!sp)
> return NULL;
> + sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0,
> + gfp_flags);
> + if (sp->so_seqid.owner_id < 0) {
> + kfree(sp);
> + return NULL;
> + }
> sp->so_server = server;
> sp->so_cred = get_rpccred(cred);
> spin_lock_init(&sp->so_lock);
> @@ -526,6 +527,7 @@ static void nfs4_free_state_owner(struct nfs4_state_owner *sp)
> {
> nfs4_destroy_seqid_counter(&sp->so_seqid);
> put_rpccred(sp->so_cred);
> + ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id);
> kfree(sp);
> }
>
> @@ -576,13 +578,9 @@ struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server,
> new = nfs4_alloc_state_owner(server, cred, gfp_flags);
> if (new == NULL)
> goto out;
> - do {
> - if (ida_pre_get(&server->openowner_id, gfp_flags) == 0)
> - break;
> - spin_lock(&clp->cl_lock);
> - sp = nfs4_insert_state_owner_locked(new);
> - spin_unlock(&clp->cl_lock);
> - } while (sp == ERR_PTR(-EAGAIN));
> + spin_lock(&clp->cl_lock);
> + sp = nfs4_insert_state_owner_locked(new);
> + spin_unlock(&clp->cl_lock);
> if (sp != new)
> nfs4_free_state_owner(new);
> out:
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
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