Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/nfs/nfs4renewd.c |
| 3 | * |
| 4 | * Copyright (c) 2002 The Regents of the University of Michigan. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Kendrick Smith <kmsmith@umich.edu> |
| 8 | * |
| 9 | * Redistribution and use in source and binary forms, with or without |
| 10 | * modification, are permitted provided that the following conditions |
| 11 | * are met: |
| 12 | * |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * 3. Neither the name of the University nor the names of its |
| 19 | * contributors may be used to endorse or promote products derived |
| 20 | * from this software without specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 23 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 24 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 25 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 27 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 28 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 29 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 30 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 31 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 32 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 33 | * |
| 34 | * Implementation of the NFSv4 "renew daemon", which wakes up periodically to |
| 35 | * send a RENEW, to keep state alive on the server. The daemon is implemented |
| 36 | * as an rpc_task, not a real kernel thread, so it always runs in rpciod's |
| 37 | * context. There is one renewd per nfs_server. |
| 38 | * |
| 39 | * TODO: If the send queue gets backlogged (e.g., if the server goes down), |
| 40 | * we will keep filling the queue with periodic RENEW requests. We need a |
| 41 | * mechanism for ensuring that if renewd successfully sends off a request, |
| 42 | * then it only wakes up when the request is finished. Maybe use the |
| 43 | * child task framework of the RPC layer? |
| 44 | */ |
| 45 | |
| 46 | #include <linux/sched.h> |
| 47 | #include <linux/smp_lock.h> |
| 48 | #include <linux/mm.h> |
| 49 | #include <linux/pagemap.h> |
| 50 | #include <linux/sunrpc/sched.h> |
| 51 | #include <linux/sunrpc/clnt.h> |
| 52 | |
| 53 | #include <linux/nfs.h> |
| 54 | #include <linux/nfs4.h> |
| 55 | #include <linux/nfs_fs.h> |
Trond Myklebust | 4ce7971 | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 56 | #include "nfs4_fs.h" |
Trond Myklebust | 58d9714a | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 57 | #include "delegation.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | #define NFSDBG_FACILITY NFSDBG_PROC |
| 60 | |
| 61 | void |
| 62 | nfs4_renew_state(void *data) |
| 63 | { |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 64 | struct nfs_client *clp = (struct nfs_client *)data; |
Trond Myklebust | b4454fe | 2006-01-03 09:55:25 +0100 | [diff] [blame] | 65 | struct rpc_cred *cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | long lease, timeout; |
| 67 | unsigned long last, now; |
| 68 | |
| 69 | down_read(&clp->cl_sem); |
| 70 | dprintk("%s: start\n", __FUNCTION__); |
| 71 | /* Are there any active superblocks? */ |
| 72 | if (list_empty(&clp->cl_superblocks)) |
Trond Myklebust | 58d9714a | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 73 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | spin_lock(&clp->cl_lock); |
| 75 | lease = clp->cl_lease_time; |
| 76 | last = clp->cl_last_renewal; |
| 77 | now = jiffies; |
| 78 | timeout = (2 * lease) / 3 + (long)last - (long)now; |
| 79 | /* Are we close to a lease timeout? */ |
| 80 | if (time_after(now, last + lease/3)) { |
Trond Myklebust | b4454fe | 2006-01-03 09:55:25 +0100 | [diff] [blame] | 81 | cred = nfs4_get_renew_cred(clp); |
| 82 | if (cred == NULL) { |
Trond Myklebust | 58d9714a | 2006-01-03 09:55:24 +0100 | [diff] [blame] | 83 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
| 84 | spin_unlock(&clp->cl_lock); |
| 85 | nfs_expire_all_delegations(clp); |
| 86 | goto out; |
| 87 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | spin_unlock(&clp->cl_lock); |
| 89 | /* Queue an asynchronous RENEW. */ |
Trond Myklebust | b4454fe | 2006-01-03 09:55:25 +0100 | [diff] [blame] | 90 | nfs4_proc_async_renew(clp, cred); |
| 91 | put_rpccred(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | timeout = (2 * lease) / 3; |
| 93 | spin_lock(&clp->cl_lock); |
| 94 | } else |
| 95 | dprintk("%s: failed to call renewd. Reason: lease not expired \n", |
| 96 | __FUNCTION__); |
| 97 | if (timeout < 5 * HZ) /* safeguard */ |
| 98 | timeout = 5 * HZ; |
| 99 | dprintk("%s: requeueing work. Lease period = %ld\n", |
| 100 | __FUNCTION__, (timeout + HZ - 1) / HZ); |
| 101 | cancel_delayed_work(&clp->cl_renewd); |
| 102 | schedule_delayed_work(&clp->cl_renewd, timeout); |
| 103 | spin_unlock(&clp->cl_lock); |
| 104 | out: |
| 105 | up_read(&clp->cl_sem); |
| 106 | dprintk("%s: done\n", __FUNCTION__); |
| 107 | } |
| 108 | |
| 109 | /* Must be called with clp->cl_sem locked for writes */ |
| 110 | void |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 111 | nfs4_schedule_state_renewal(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | { |
| 113 | long timeout; |
| 114 | |
| 115 | spin_lock(&clp->cl_lock); |
| 116 | timeout = (2 * clp->cl_lease_time) / 3 + (long)clp->cl_last_renewal |
| 117 | - (long)jiffies; |
| 118 | if (timeout < 5 * HZ) |
| 119 | timeout = 5 * HZ; |
| 120 | dprintk("%s: requeueing work. Lease period = %ld\n", |
| 121 | __FUNCTION__, (timeout + HZ - 1) / HZ); |
| 122 | cancel_delayed_work(&clp->cl_renewd); |
| 123 | schedule_delayed_work(&clp->cl_renewd, timeout); |
Trond Myklebust | 5dd3177 | 2006-08-24 01:03:05 -0400 | [diff] [blame] | 124 | set_bit(NFS_CS_RENEWD, &clp->cl_res_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | spin_unlock(&clp->cl_lock); |
| 126 | } |
| 127 | |
| 128 | void |
| 129 | nfs4_renewd_prepare_shutdown(struct nfs_server *server) |
| 130 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | flush_scheduled_work(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | } |
| 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | void |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 135 | nfs4_kill_renewd(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | { |
| 137 | down_read(&clp->cl_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | cancel_delayed_work(&clp->cl_renewd); |
| 139 | up_read(&clp->cl_sem); |
| 140 | flush_scheduled_work(); |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * Local variables: |
| 145 | * c-basic-offset: 8 |
| 146 | * End: |
| 147 | */ |