blob: 81c5eec3cf3803a610efee85e37d0f2276cbe108 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfs/delegation.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFS file delegation management
7 *
8 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/completion.h>
Trond Myklebust58d97142006-01-03 09:55:24 +010010#include <linux/kthread.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/module.h>
12#include <linux/sched.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/spinlock.h>
15
16#include <linux/nfs4.h>
17#include <linux/nfs_fs.h>
18#include <linux/nfs_xdr.h>
19
Trond Myklebust4ce79712005-06-22 17:16:21 +000020#include "nfs4_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "delegation.h"
David Howells24c8dbb2006-08-22 20:06:10 -040022#include "internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Trond Myklebust905f8d12007-08-06 12:18:34 -040024static void nfs_free_delegation(struct nfs_delegation *delegation)
25{
Trond Myklebuste00b8a22011-01-27 14:55:39 -050026 if (delegation->cred) {
27 put_rpccred(delegation->cred);
28 delegation->cred = NULL;
29 }
Lai Jiangshan26f04dd2011-05-01 06:21:54 -070030 kfree_rcu(delegation, rcu);
Trond Myklebust8383e462007-07-06 15:12:04 -040031}
32
Chuck Leverd3978bb2010-12-24 01:33:04 +000033/**
34 * nfs_mark_delegation_referenced - set delegation's REFERENCED flag
35 * @delegation: delegation to process
36 *
37 */
Trond Myklebustb7391f42008-12-23 15:21:52 -050038void nfs_mark_delegation_referenced(struct nfs_delegation *delegation)
39{
40 set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags);
41}
42
Chuck Leverd3978bb2010-12-24 01:33:04 +000043/**
44 * nfs_have_delegation - check if inode has a delegation
45 * @inode: inode to check
46 * @flags: delegation types to check for
47 *
48 * Returns one if inode has the indicated delegation, otherwise zero.
49 */
Bryan Schumaker011e2a72012-06-20 15:53:43 -040050int nfs4_have_delegation(struct inode *inode, fmode_t flags)
Trond Myklebustb7391f42008-12-23 15:21:52 -050051{
52 struct nfs_delegation *delegation;
53 int ret = 0;
54
55 flags &= FMODE_READ|FMODE_WRITE;
56 rcu_read_lock();
57 delegation = rcu_dereference(NFS_I(inode)->delegation);
58 if (delegation != NULL && (delegation->type & flags) == flags) {
59 nfs_mark_delegation_referenced(delegation);
60 ret = 1;
61 }
62 rcu_read_unlock();
63 return ret;
64}
65
Trond Myklebust888e6942005-11-04 15:38:11 -050066static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state)
67{
68 struct inode *inode = state->inode;
69 struct file_lock *fl;
Trond Myklebustd5122202009-06-17 13:22:58 -070070 int status = 0;
Trond Myklebust888e6942005-11-04 15:38:11 -050071
Trond Myklebust3f09df72009-06-17 13:23:00 -070072 if (inode->i_flock == NULL)
73 goto out;
74
Arnd Bergmannb89f4322010-09-18 15:09:31 +020075 /* Protect inode->i_flock using the file locks lock */
76 lock_flocks();
Harvey Harrison90dc7d22008-02-20 13:03:05 -080077 for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
Trond Myklebust888e6942005-11-04 15:38:11 -050078 if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
79 continue;
Trond Myklebustcd3758e2007-08-10 17:44:32 -040080 if (nfs_file_open_context(fl->fl_file) != ctx)
Trond Myklebust888e6942005-11-04 15:38:11 -050081 continue;
Arnd Bergmannb89f4322010-09-18 15:09:31 +020082 unlock_flocks();
Trond Myklebust888e6942005-11-04 15:38:11 -050083 status = nfs4_lock_delegation_recall(state, fl);
Trond Myklebustd5122202009-06-17 13:22:58 -070084 if (status < 0)
Trond Myklebust3f09df72009-06-17 13:23:00 -070085 goto out;
Arnd Bergmannb89f4322010-09-18 15:09:31 +020086 lock_flocks();
Trond Myklebust888e6942005-11-04 15:38:11 -050087 }
Arnd Bergmannb89f4322010-09-18 15:09:31 +020088 unlock_flocks();
Trond Myklebust3f09df72009-06-17 13:23:00 -070089out:
Trond Myklebust888e6942005-11-04 15:38:11 -050090 return status;
91}
92
Trond Myklebustd18cc1f2009-12-03 08:10:17 -050093static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070094{
95 struct nfs_inode *nfsi = NFS_I(inode);
96 struct nfs_open_context *ctx;
97 struct nfs4_state *state;
Trond Myklebust888e6942005-11-04 15:38:11 -050098 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100again:
101 spin_lock(&inode->i_lock);
102 list_for_each_entry(ctx, &nfsi->open_files, list) {
103 state = ctx->state;
104 if (state == NULL)
105 continue;
106 if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
107 continue;
Trond Myklebustf597c532012-03-04 18:13:56 -0500108 if (!nfs4_stateid_match(&state->stateid, stateid))
Trond Myklebust90163022007-07-05 14:55:18 -0400109 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 get_nfs_open_context(ctx);
111 spin_unlock(&inode->i_lock);
Trond Myklebust13437e12007-07-06 15:10:43 -0400112 err = nfs4_open_delegation_recall(ctx, state, stateid);
Trond Myklebust888e6942005-11-04 15:38:11 -0500113 if (err >= 0)
114 err = nfs_delegation_claim_locks(ctx, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 put_nfs_open_context(ctx);
Trond Myklebust888e6942005-11-04 15:38:11 -0500116 if (err != 0)
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500117 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 goto again;
119 }
120 spin_unlock(&inode->i_lock);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500121 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122}
123
Chuck Leverd3978bb2010-12-24 01:33:04 +0000124/**
125 * nfs_inode_reclaim_delegation - process a delegation reclaim request
126 * @inode: inode to process
127 * @cred: credential to use for request
128 * @res: new delegation state from server
129 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 */
Chuck Leverd3978bb2010-12-24 01:33:04 +0000131void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred,
132 struct nfs_openres *res)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
Trond Myklebust8f649c32010-05-01 12:36:18 -0400134 struct nfs_delegation *delegation;
135 struct rpc_cred *oldcred = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Trond Myklebust8f649c32010-05-01 12:36:18 -0400137 rcu_read_lock();
138 delegation = rcu_dereference(NFS_I(inode)->delegation);
139 if (delegation != NULL) {
140 spin_lock(&delegation->lock);
141 if (delegation->inode != NULL) {
Trond Myklebustf597c532012-03-04 18:13:56 -0500142 nfs4_stateid_copy(&delegation->stateid, &res->delegation);
Trond Myklebust8f649c32010-05-01 12:36:18 -0400143 delegation->type = res->delegation_type;
144 delegation->maxsize = res->maxsize;
145 oldcred = delegation->cred;
146 delegation->cred = get_rpccred(cred);
147 clear_bit(NFS_DELEGATION_NEED_RECLAIM,
148 &delegation->flags);
149 NFS_I(inode)->delegation_state = delegation->type;
150 spin_unlock(&delegation->lock);
151 put_rpccred(oldcred);
152 rcu_read_unlock();
153 } else {
154 /* We appear to have raced with a delegation return. */
155 spin_unlock(&delegation->lock);
156 rcu_read_unlock();
157 nfs_inode_set_delegation(inode, cred, res);
158 }
159 } else {
160 rcu_read_unlock();
161 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}
163
Trond Myklebust57bfa892008-01-25 16:38:18 -0500164static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync)
165{
166 int res = 0;
167
168 res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync);
169 nfs_free_delegation(delegation);
170 return res;
171}
172
Trond Myklebust86e89482008-12-23 15:21:39 -0500173static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation)
174{
175 struct inode *inode = NULL;
176
177 spin_lock(&delegation->lock);
178 if (delegation->inode != NULL)
179 inode = igrab(delegation->inode);
180 spin_unlock(&delegation->lock);
181 return inode;
182}
183
Chuck Leverdda4b222010-12-24 01:32:54 +0000184static struct nfs_delegation *
185nfs_detach_delegation_locked(struct nfs_inode *nfsi,
Chuck Leverd3978bb2010-12-24 01:33:04 +0000186 struct nfs_server *server)
Trond Myklebust57bfa892008-01-25 16:38:18 -0500187{
David Howells17d2c0a2010-05-01 12:37:18 -0400188 struct nfs_delegation *delegation =
189 rcu_dereference_protected(nfsi->delegation,
Chuck Leverd3978bb2010-12-24 01:33:04 +0000190 lockdep_is_held(&server->nfs_client->cl_lock));
Trond Myklebust57bfa892008-01-25 16:38:18 -0500191
192 if (delegation == NULL)
193 goto nomatch;
Chuck Leverdda4b222010-12-24 01:32:54 +0000194
Trond Myklebust34310432008-12-23 15:21:38 -0500195 spin_lock(&delegation->lock);
Trond Myklebust57bfa892008-01-25 16:38:18 -0500196 list_del_rcu(&delegation->super_list);
Trond Myklebust86e89482008-12-23 15:21:39 -0500197 delegation->inode = NULL;
Trond Myklebust57bfa892008-01-25 16:38:18 -0500198 nfsi->delegation_state = 0;
199 rcu_assign_pointer(nfsi->delegation, NULL);
Trond Myklebust34310432008-12-23 15:21:38 -0500200 spin_unlock(&delegation->lock);
Trond Myklebust57bfa892008-01-25 16:38:18 -0500201 return delegation;
202nomatch:
203 return NULL;
204}
205
Chuck Leverdda4b222010-12-24 01:32:54 +0000206static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi,
Chuck Leverd3978bb2010-12-24 01:33:04 +0000207 struct nfs_server *server)
Chuck Leverdda4b222010-12-24 01:32:54 +0000208{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000209 struct nfs_client *clp = server->nfs_client;
Chuck Leverdda4b222010-12-24 01:32:54 +0000210 struct nfs_delegation *delegation;
211
212 spin_lock(&clp->cl_lock);
Chuck Leverd3978bb2010-12-24 01:33:04 +0000213 delegation = nfs_detach_delegation_locked(nfsi, server);
Chuck Leverdda4b222010-12-24 01:32:54 +0000214 spin_unlock(&clp->cl_lock);
215 return delegation;
216}
217
Chuck Leverd3978bb2010-12-24 01:33:04 +0000218/**
219 * nfs_inode_set_delegation - set up a delegation on an inode
220 * @inode: inode to which delegation applies
221 * @cred: cred to use for subsequent delegation processing
222 * @res: new delegation state from server
223 *
224 * Returns zero on success, or a negative errno value.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 */
226int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res)
227{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000228 struct nfs_server *server = NFS_SERVER(inode);
229 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 struct nfs_inode *nfsi = NFS_I(inode);
David Howells17d2c0a2010-05-01 12:37:18 -0400231 struct nfs_delegation *delegation, *old_delegation;
Trond Myklebust57bfa892008-01-25 16:38:18 -0500232 struct nfs_delegation *freeme = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 int status = 0;
234
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400235 delegation = kmalloc(sizeof(*delegation), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 if (delegation == NULL)
237 return -ENOMEM;
Trond Myklebustf597c532012-03-04 18:13:56 -0500238 nfs4_stateid_copy(&delegation->stateid, &res->delegation);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 delegation->type = res->delegation_type;
240 delegation->maxsize = res->maxsize;
Trond Myklebusta9a4a872011-10-17 16:08:46 -0700241 delegation->change_attr = inode->i_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 delegation->cred = get_rpccred(cred);
243 delegation->inode = inode;
Trond Myklebustb7391f42008-12-23 15:21:52 -0500244 delegation->flags = 1<<NFS_DELEGATION_REFERENCED;
Trond Myklebust34310432008-12-23 15:21:38 -0500245 spin_lock_init(&delegation->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247 spin_lock(&clp->cl_lock);
David Howells17d2c0a2010-05-01 12:37:18 -0400248 old_delegation = rcu_dereference_protected(nfsi->delegation,
Chuck Leverd3978bb2010-12-24 01:33:04 +0000249 lockdep_is_held(&clp->cl_lock));
David Howells17d2c0a2010-05-01 12:37:18 -0400250 if (old_delegation != NULL) {
Trond Myklebustf597c532012-03-04 18:13:56 -0500251 if (nfs4_stateid_match(&delegation->stateid,
252 &old_delegation->stateid) &&
David Howells17d2c0a2010-05-01 12:37:18 -0400253 delegation->type == old_delegation->type) {
Trond Myklebust57bfa892008-01-25 16:38:18 -0500254 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 }
Trond Myklebust57bfa892008-01-25 16:38:18 -0500256 /*
257 * Deal with broken servers that hand out two
258 * delegations for the same file.
Trond Myklebust17280172012-03-11 13:11:00 -0400259 * Allow for upgrades to a WRITE delegation, but
260 * nothing else.
Trond Myklebust57bfa892008-01-25 16:38:18 -0500261 */
262 dfprintk(FILE, "%s: server %s handed out "
263 "a duplicate delegation!\n",
Harvey Harrison3110ff82008-05-02 13:42:44 -0700264 __func__, clp->cl_hostname);
Trond Myklebust17280172012-03-11 13:11:00 -0400265 if (delegation->type == old_delegation->type ||
266 !(delegation->type & FMODE_WRITE)) {
Trond Myklebust57bfa892008-01-25 16:38:18 -0500267 freeme = delegation;
268 delegation = NULL;
269 goto out;
270 }
Chuck Leverd3978bb2010-12-24 01:33:04 +0000271 freeme = nfs_detach_delegation_locked(nfsi, server);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
Chuck Leverd3978bb2010-12-24 01:33:04 +0000273 list_add_rcu(&delegation->super_list, &server->delegations);
Trond Myklebust57bfa892008-01-25 16:38:18 -0500274 nfsi->delegation_state = delegation->type;
275 rcu_assign_pointer(nfsi->delegation, delegation);
276 delegation = NULL;
Trond Myklebust412c77c2007-07-03 16:10:55 -0400277
278 /* Ensure we revalidate the attributes and page cache! */
279 spin_lock(&inode->i_lock);
280 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
281 spin_unlock(&inode->i_lock);
282
Trond Myklebust57bfa892008-01-25 16:38:18 -0500283out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 spin_unlock(&clp->cl_lock);
Trond Myklebust603c83d2007-10-18 19:59:20 -0400285 if (delegation != NULL)
286 nfs_free_delegation(delegation);
Trond Myklebust57bfa892008-01-25 16:38:18 -0500287 if (freeme != NULL)
288 nfs_do_return_delegation(inode, freeme, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 return status;
290}
291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292/*
293 * Basic procedure for returning a delegation to the server
294 */
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500295static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500298 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Trond Myklebust3f09df72009-06-17 13:23:00 -0700300 /*
301 * Guard against new delegated open/lock/unlock calls and against
302 * state recovery
303 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 down_write(&nfsi->rwsem);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500305 err = nfs_delegation_claim_opens(inode, &delegation->stateid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 up_write(&nfsi->rwsem);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500307 if (err)
308 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500310 err = nfs_do_return_delegation(inode, delegation, issync);
311out:
312 return err;
Trond Myklebust90163022007-07-05 14:55:18 -0400313}
314
Chuck Leverd3978bb2010-12-24 01:33:04 +0000315/**
316 * nfs_client_return_marked_delegations - return previously marked delegations
317 * @clp: nfs_client to process
318 *
Trond Myklebustdc327ed2012-05-06 19:46:30 -0400319 * Note that this function is designed to be called by the state
320 * manager thread. For this reason, it cannot flush the dirty data,
321 * since that could deadlock in case of a state recovery error.
322 *
Chuck Leverd3978bb2010-12-24 01:33:04 +0000323 * Returns zero on success, or a negative errno value.
Trond Myklebust515d8612008-12-23 15:21:46 -0500324 */
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500325int nfs_client_return_marked_delegations(struct nfs_client *clp)
Trond Myklebust515d8612008-12-23 15:21:46 -0500326{
327 struct nfs_delegation *delegation;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000328 struct nfs_server *server;
Trond Myklebust515d8612008-12-23 15:21:46 -0500329 struct inode *inode;
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500330 int err = 0;
Trond Myklebust515d8612008-12-23 15:21:46 -0500331
332restart:
333 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000334 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
335 list_for_each_entry_rcu(delegation, &server->delegations,
336 super_list) {
337 if (!test_and_clear_bit(NFS_DELEGATION_RETURN,
338 &delegation->flags))
339 continue;
340 inode = nfs_delegation_grab_inode(delegation);
341 if (inode == NULL)
342 continue;
343 delegation = nfs_detach_delegation(NFS_I(inode),
344 server);
345 rcu_read_unlock();
346
Trond Myklebustdc327ed2012-05-06 19:46:30 -0400347 if (delegation != NULL)
Chuck Leverd3978bb2010-12-24 01:33:04 +0000348 err = __nfs_inode_return_delegation(inode,
349 delegation, 0);
Chuck Leverd3978bb2010-12-24 01:33:04 +0000350 iput(inode);
351 if (!err)
352 goto restart;
353 set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
354 return err;
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500355 }
Trond Myklebust515d8612008-12-23 15:21:46 -0500356 }
357 rcu_read_unlock();
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500358 return 0;
Trond Myklebust515d8612008-12-23 15:21:46 -0500359}
360
Chuck Leverd3978bb2010-12-24 01:33:04 +0000361/**
362 * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens
363 * @inode: inode to process
364 *
365 * Does not protect against delegation reclaims, therefore really only safe
366 * to be called from nfs4_clear_inode().
Trond Myklebuste6f81072008-01-24 18:14:34 -0500367 */
368void nfs_inode_return_delegation_noreclaim(struct inode *inode)
369{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000370 struct nfs_server *server = NFS_SERVER(inode);
Trond Myklebuste6f81072008-01-24 18:14:34 -0500371 struct nfs_inode *nfsi = NFS_I(inode);
372 struct nfs_delegation *delegation;
373
David Howells17d2c0a2010-05-01 12:37:18 -0400374 if (rcu_access_pointer(nfsi->delegation) != NULL) {
Chuck Leverd3978bb2010-12-24 01:33:04 +0000375 delegation = nfs_detach_delegation(nfsi, server);
Trond Myklebuste6f81072008-01-24 18:14:34 -0500376 if (delegation != NULL)
377 nfs_do_return_delegation(inode, delegation, 0);
378 }
379}
380
Chuck Leverd3978bb2010-12-24 01:33:04 +0000381/**
382 * nfs_inode_return_delegation - synchronously return a delegation
383 * @inode: inode to process
384 *
Trond Myklebustc57d1bc2012-05-06 19:34:17 -0400385 * This routine will always flush any dirty data to disk on the
386 * assumption that if we need to return the delegation, then
387 * we should stop caching.
388 *
Chuck Leverd3978bb2010-12-24 01:33:04 +0000389 * Returns zero on success, or a negative errno value.
390 */
Bryan Schumaker57ec14c2012-06-20 15:53:44 -0400391int nfs4_inode_return_delegation(struct inode *inode)
Trond Myklebust90163022007-07-05 14:55:18 -0400392{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000393 struct nfs_server *server = NFS_SERVER(inode);
Trond Myklebust90163022007-07-05 14:55:18 -0400394 struct nfs_inode *nfsi = NFS_I(inode);
395 struct nfs_delegation *delegation;
396 int err = 0;
397
Trond Myklebustc57d1bc2012-05-06 19:34:17 -0400398 nfs_wb_all(inode);
David Howells17d2c0a2010-05-01 12:37:18 -0400399 if (rcu_access_pointer(nfsi->delegation) != NULL) {
Chuck Leverd3978bb2010-12-24 01:33:04 +0000400 delegation = nfs_detach_delegation(nfsi, server);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500401 if (delegation != NULL) {
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500402 err = __nfs_inode_return_delegation(inode, delegation, 1);
403 }
Trond Myklebust90163022007-07-05 14:55:18 -0400404 }
405 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406}
407
Trond Myklebusted1e62112011-07-25 15:37:29 -0400408static void nfs_mark_return_delegation(struct nfs_server *server,
409 struct nfs_delegation *delegation)
Trond Myklebust6411bd42008-12-23 15:21:51 -0500410{
411 set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
Trond Myklebusted1e62112011-07-25 15:37:29 -0400412 set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
Trond Myklebust6411bd42008-12-23 15:21:51 -0500413}
414
Chuck Leverd3978bb2010-12-24 01:33:04 +0000415/**
416 * nfs_super_return_all_delegations - return delegations for one superblock
417 * @sb: sb to process
418 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 */
Bryan Schumakereeebf912012-06-20 15:53:41 -0400420void nfs_server_return_all_delegations(struct nfs_server *server)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000422 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 struct nfs_delegation *delegation;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425 if (clp == NULL)
426 return;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000427
Trond Myklebust8383e462007-07-06 15:12:04 -0400428 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000429 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Trond Myklebust86e89482008-12-23 15:21:39 -0500430 spin_lock(&delegation->lock);
Chuck Leverd3978bb2010-12-24 01:33:04 +0000431 set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
Trond Myklebust86e89482008-12-23 15:21:39 -0500432 spin_unlock(&delegation->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400434 rcu_read_unlock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000435
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500436 if (nfs_client_return_marked_delegations(clp) != 0)
437 nfs4_schedule_state_manager(clp);
Trond Myklebust515d8612008-12-23 15:21:46 -0500438}
439
Chuck Leverd3978bb2010-12-24 01:33:04 +0000440static void nfs_mark_return_all_delegation_types(struct nfs_server *server,
441 fmode_t flags)
Trond Myklebust515d8612008-12-23 15:21:46 -0500442{
443 struct nfs_delegation *delegation;
444
Chuck Leverd3978bb2010-12-24 01:33:04 +0000445 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Alexandros Batsakisc79571a2009-12-05 13:20:52 -0500446 if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE))
447 continue;
448 if (delegation->type & flags)
Trond Myklebusted1e62112011-07-25 15:37:29 -0400449 nfs_mark_return_delegation(server, delegation);
Trond Myklebust707fb4b2008-12-23 15:21:47 -0500450 }
Chuck Leverd3978bb2010-12-24 01:33:04 +0000451}
452
453static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp,
454 fmode_t flags)
455{
456 struct nfs_server *server;
457
458 rcu_read_lock();
459 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
460 nfs_mark_return_all_delegation_types(server, flags);
Trond Myklebust515d8612008-12-23 15:21:46 -0500461 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462}
463
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500464static void nfs_delegation_run_state_manager(struct nfs_client *clp)
Trond Myklebust58d97142006-01-03 09:55:24 +0100465{
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500466 if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state))
467 nfs4_schedule_state_manager(clp);
Trond Myklebust58d97142006-01-03 09:55:24 +0100468}
469
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -0500470void nfs_remove_bad_delegation(struct inode *inode)
471{
472 struct nfs_delegation *delegation;
473
474 delegation = nfs_detach_delegation(NFS_I(inode), NFS_SERVER(inode));
475 if (delegation) {
476 nfs_inode_find_state_and_recover(inode, &delegation->stateid);
477 nfs_free_delegation(delegation);
478 }
479}
Andy Adamson9cb81962012-03-07 10:49:41 -0500480EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation);
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -0500481
Chuck Leverd3978bb2010-12-24 01:33:04 +0000482/**
483 * nfs_expire_all_delegation_types
484 * @clp: client to process
485 * @flags: delegation types to expire
486 *
487 */
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500488void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags)
Alexandros Batsakisc79571a2009-12-05 13:20:52 -0500489{
490 nfs_client_mark_return_all_delegation_types(clp, flags);
491 nfs_delegation_run_state_manager(clp);
492}
493
Chuck Leverd3978bb2010-12-24 01:33:04 +0000494/**
495 * nfs_expire_all_delegations
496 * @clp: client to process
497 *
498 */
David Howellsadfa6f92006-08-22 20:06:08 -0400499void nfs_expire_all_delegations(struct nfs_client *clp)
Trond Myklebust58d97142006-01-03 09:55:24 +0100500{
Alexandros Batsakisc79571a2009-12-05 13:20:52 -0500501 nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE);
Trond Myklebust58d97142006-01-03 09:55:24 +0100502}
503
Chuck Leverd3978bb2010-12-24 01:33:04 +0000504static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server)
Trond Myklebustb7391f42008-12-23 15:21:52 -0500505{
506 struct nfs_delegation *delegation;
507
Chuck Leverd3978bb2010-12-24 01:33:04 +0000508 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Trond Myklebustb7391f42008-12-23 15:21:52 -0500509 if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags))
510 continue;
Trond Myklebusted1e62112011-07-25 15:37:29 -0400511 nfs_mark_return_delegation(server, delegation);
Trond Myklebustb7391f42008-12-23 15:21:52 -0500512 }
Trond Myklebustb7391f42008-12-23 15:21:52 -0500513}
514
Chuck Leverd3978bb2010-12-24 01:33:04 +0000515/**
516 * nfs_expire_unreferenced_delegations - Eliminate unused delegations
517 * @clp: nfs_client to process
518 *
519 */
Trond Myklebustb7391f42008-12-23 15:21:52 -0500520void nfs_expire_unreferenced_delegations(struct nfs_client *clp)
521{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000522 struct nfs_server *server;
523
524 rcu_read_lock();
525 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
526 nfs_mark_return_unreferenced_delegations(server);
527 rcu_read_unlock();
528
Trond Myklebustb7391f42008-12-23 15:21:52 -0500529 nfs_delegation_run_state_manager(clp);
530}
531
Chuck Leverd3978bb2010-12-24 01:33:04 +0000532/**
533 * nfs_async_inode_return_delegation - asynchronously return a delegation
534 * @inode: inode to process
Trond Myklebust8e663f02012-03-04 18:13:56 -0500535 * @stateid: state ID information
Chuck Leverd3978bb2010-12-24 01:33:04 +0000536 *
537 * Returns zero on success, or a negative errno value.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 */
Chuck Leverd3978bb2010-12-24 01:33:04 +0000539int nfs_async_inode_return_delegation(struct inode *inode,
540 const nfs4_stateid *stateid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541{
Trond Myklebusted1e62112011-07-25 15:37:29 -0400542 struct nfs_server *server = NFS_SERVER(inode);
543 struct nfs_client *clp = server->nfs_client;
Trond Myklebust6411bd42008-12-23 15:21:51 -0500544 struct nfs_delegation *delegation;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Trond Myklebustdc327ed2012-05-06 19:46:30 -0400546 filemap_flush(inode->i_mapping);
547
Trond Myklebust6411bd42008-12-23 15:21:51 -0500548 rcu_read_lock();
549 delegation = rcu_dereference(NFS_I(inode)->delegation);
Alexandros Batsakis25976412009-12-05 13:48:55 -0500550
Trond Myklebust36281ca2012-03-04 18:13:56 -0500551 if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) {
Trond Myklebust6411bd42008-12-23 15:21:51 -0500552 rcu_read_unlock();
553 return -ENOENT;
554 }
Trond Myklebusted1e62112011-07-25 15:37:29 -0400555 nfs_mark_return_delegation(server, delegation);
Trond Myklebust6411bd42008-12-23 15:21:51 -0500556 rcu_read_unlock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000557
Trond Myklebust6411bd42008-12-23 15:21:51 -0500558 nfs_delegation_run_state_manager(clp);
559 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560}
561
Chuck Leverd3978bb2010-12-24 01:33:04 +0000562static struct inode *
563nfs_delegation_find_inode_server(struct nfs_server *server,
564 const struct nfs_fh *fhandle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565{
566 struct nfs_delegation *delegation;
567 struct inode *res = NULL;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000568
569 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Trond Myklebust86e89482008-12-23 15:21:39 -0500570 spin_lock(&delegation->lock);
571 if (delegation->inode != NULL &&
572 nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 res = igrab(delegation->inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 }
Trond Myklebust86e89482008-12-23 15:21:39 -0500575 spin_unlock(&delegation->lock);
576 if (res != NULL)
577 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 }
Chuck Leverd3978bb2010-12-24 01:33:04 +0000579 return res;
580}
581
582/**
583 * nfs_delegation_find_inode - retrieve the inode associated with a delegation
584 * @clp: client state handle
585 * @fhandle: filehandle from a delegation recall
586 *
587 * Returns pointer to inode matching "fhandle," or NULL if a matching inode
588 * cannot be found.
589 */
590struct inode *nfs_delegation_find_inode(struct nfs_client *clp,
591 const struct nfs_fh *fhandle)
592{
593 struct nfs_server *server;
594 struct inode *res = NULL;
595
596 rcu_read_lock();
597 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
598 res = nfs_delegation_find_inode_server(server, fhandle);
599 if (res != NULL)
600 break;
601 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400602 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 return res;
604}
605
Chuck Leverd3978bb2010-12-24 01:33:04 +0000606static void nfs_delegation_mark_reclaim_server(struct nfs_server *server)
607{
608 struct nfs_delegation *delegation;
609
610 list_for_each_entry_rcu(delegation, &server->delegations, super_list)
611 set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
612}
613
614/**
615 * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed
616 * @clp: nfs_client to process
617 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 */
David Howellsadfa6f92006-08-22 20:06:08 -0400619void nfs_delegation_mark_reclaim(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000621 struct nfs_server *server;
622
Trond Myklebust8383e462007-07-06 15:12:04 -0400623 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000624 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
625 nfs_delegation_mark_reclaim_server(server);
Trond Myklebust8383e462007-07-06 15:12:04 -0400626 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627}
628
Chuck Leverd3978bb2010-12-24 01:33:04 +0000629/**
630 * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done
631 * @clp: nfs_client to process
632 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 */
David Howellsadfa6f92006-08-22 20:06:08 -0400634void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635{
Trond Myklebust8383e462007-07-06 15:12:04 -0400636 struct nfs_delegation *delegation;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000637 struct nfs_server *server;
Trond Myklebust86e89482008-12-23 15:21:39 -0500638 struct inode *inode;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000639
Trond Myklebust8383e462007-07-06 15:12:04 -0400640restart:
641 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000642 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
643 list_for_each_entry_rcu(delegation, &server->delegations,
644 super_list) {
645 if (test_bit(NFS_DELEGATION_NEED_RECLAIM,
646 &delegation->flags) == 0)
647 continue;
648 inode = nfs_delegation_grab_inode(delegation);
649 if (inode == NULL)
650 continue;
651 delegation = nfs_detach_delegation(NFS_I(inode),
652 server);
653 rcu_read_unlock();
654
655 if (delegation != NULL)
656 nfs_free_delegation(delegation);
657 iput(inode);
658 goto restart;
659 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400661 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662}
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500663
Chuck Leverd3978bb2010-12-24 01:33:04 +0000664/**
665 * nfs_delegations_present - check for existence of delegations
666 * @clp: client state handle
667 *
668 * Returns one if there are any nfs_delegation structures attached
669 * to this nfs_client.
670 */
671int nfs_delegations_present(struct nfs_client *clp)
672{
673 struct nfs_server *server;
674 int ret = 0;
675
676 rcu_read_lock();
677 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
678 if (!list_empty(&server->delegations)) {
679 ret = 1;
680 break;
681 }
682 rcu_read_unlock();
683 return ret;
684}
685
686/**
687 * nfs4_copy_delegation_stateid - Copy inode's state ID information
688 * @dst: stateid data structure to fill in
689 * @inode: inode to check
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500690 * @flags: delegation type requirement
Chuck Leverd3978bb2010-12-24 01:33:04 +0000691 *
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500692 * Returns "true" and fills in "dst->data" * if inode had a delegation,
693 * otherwise "false" is returned.
Chuck Leverd3978bb2010-12-24 01:33:04 +0000694 */
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500695bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode,
696 fmode_t flags)
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500697{
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500698 struct nfs_inode *nfsi = NFS_I(inode);
699 struct nfs_delegation *delegation;
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500700 bool ret;
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500701
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500702 flags &= FMODE_READ|FMODE_WRITE;
Trond Myklebust8383e462007-07-06 15:12:04 -0400703 rcu_read_lock();
704 delegation = rcu_dereference(nfsi->delegation);
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500705 ret = (delegation != NULL && (delegation->type & flags) == flags);
706 if (ret) {
Trond Myklebustf597c532012-03-04 18:13:56 -0500707 nfs4_stateid_copy(dst, &delegation->stateid);
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500708 nfs_mark_delegation_referenced(delegation);
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500709 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400710 rcu_read_unlock();
711 return ret;
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500712}