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author | Andy Adamson <andros@netapp.com> | 2011-01-06 02:04:30 (GMT) |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2011-01-06 19:46:24 (GMT) |
commit | f4eecd5da3422e82e88e36c33cbd2595eebcacb1 (patch) | |
tree | 8e49bbe401ed4233e1652843489a4360a94dc69b /fs/nfs/client.c | |
parent | ea00528126a701845d7c445e725b271940381e3d (diff) | |
download | linux-f4eecd5da3422e82e88e36c33cbd2595eebcacb1.tar.xz |
NFS implement v4.0 callback_ident
Use the small id to pointer translator service to provide a unique callback
identifier per SETCLIENTID call used to identify the v4.0 callback service
associated with the clientid.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/client.c')
-rw-r--r-- | fs/nfs/client.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/fs/nfs/client.c b/fs/nfs/client.c index 855add6..bc3a862 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -56,6 +56,30 @@ static DEFINE_SPINLOCK(nfs_client_lock); static LIST_HEAD(nfs_client_list); static LIST_HEAD(nfs_volume_list); static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq); +#ifdef CONFIG_NFS_V4 +static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */ + +/* + * Get a unique NFSv4.0 callback identifier which will be used + * by the V4.0 callback service to lookup the nfs_client struct + */ +static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) +{ + int ret = 0; + + if (clp->rpc_ops->version != 4 || minorversion != 0) + return ret; +retry: + if (!idr_pre_get(&cb_ident_idr, GFP_KERNEL)) + return -ENOMEM; + spin_lock(&nfs_client_lock); + ret = idr_get_new(&cb_ident_idr, clp, &clp->cl_cb_ident); + spin_unlock(&nfs_client_lock); + if (ret == -EAGAIN) + goto retry; + return ret; +} +#endif /* CONFIG_NFS_V4 */ /* * RPC cruft for NFS @@ -144,6 +168,10 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_ clp->cl_proto = cl_init->proto; #ifdef CONFIG_NFS_V4 + err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); + if (err) + goto error_cleanup; + INIT_LIST_HEAD(&clp->cl_delegations); spin_lock_init(&clp->cl_lock); INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); @@ -202,10 +230,32 @@ static void nfs4_shutdown_client(struct nfs_client *clp) rpc_destroy_wait_queue(&clp->cl_rpcwaitq); } + +/* idr_remove_all is not needed as all id's are removed by nfs_put_client */ +void nfs_cleanup_cb_ident_idr(void) +{ + idr_destroy(&cb_ident_idr); +} + +/* nfs_client_lock held */ +static void nfs_cb_idr_remove_locked(struct nfs_client *clp) +{ + if (clp->cl_cb_ident) + idr_remove(&cb_ident_idr, clp->cl_cb_ident); +} + #else static void nfs4_shutdown_client(struct nfs_client *clp) { } + +void nfs_cleanup_cb_ident_idr(void) +{ +} + +static void nfs_cb_idr_remove_locked(struct nfs_client *clp) +{ +} #endif /* CONFIG_NFS_V4 */ /* @@ -244,6 +294,7 @@ void nfs_put_client(struct nfs_client *clp) if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) { list_del(&clp->cl_share_link); + nfs_cb_idr_remove_locked(clp); spin_unlock(&nfs_client_lock); BUG_ON(!list_empty(&clp->cl_superblocks)); |