blob: 89af1d269274f3a91401f704226dec43f9c02528 [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 Myklebust58d9714a2006-01-03 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 */
Trond Myklebustbd7bf9d2008-12-23 15:21:53 -050050int nfs_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 *
319 * Returns zero on success, or a negative errno value.
Trond Myklebust515d8612008-12-23 15:21:46 -0500320 */
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500321int nfs_client_return_marked_delegations(struct nfs_client *clp)
Trond Myklebust515d8612008-12-23 15:21:46 -0500322{
323 struct nfs_delegation *delegation;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000324 struct nfs_server *server;
Trond Myklebust515d8612008-12-23 15:21:46 -0500325 struct inode *inode;
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500326 int err = 0;
Trond Myklebust515d8612008-12-23 15:21:46 -0500327
328restart:
329 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000330 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
331 list_for_each_entry_rcu(delegation, &server->delegations,
332 super_list) {
333 if (!test_and_clear_bit(NFS_DELEGATION_RETURN,
334 &delegation->flags))
335 continue;
336 inode = nfs_delegation_grab_inode(delegation);
337 if (inode == NULL)
338 continue;
339 delegation = nfs_detach_delegation(NFS_I(inode),
340 server);
341 rcu_read_unlock();
342
343 if (delegation != NULL) {
344 filemap_flush(inode->i_mapping);
345 err = __nfs_inode_return_delegation(inode,
346 delegation, 0);
347 }
348 iput(inode);
349 if (!err)
350 goto restart;
351 set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
352 return err;
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500353 }
Trond Myklebust515d8612008-12-23 15:21:46 -0500354 }
355 rcu_read_unlock();
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500356 return 0;
Trond Myklebust515d8612008-12-23 15:21:46 -0500357}
358
Chuck Leverd3978bb2010-12-24 01:33:04 +0000359/**
360 * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens
361 * @inode: inode to process
362 *
363 * Does not protect against delegation reclaims, therefore really only safe
364 * to be called from nfs4_clear_inode().
Trond Myklebuste6f81072008-01-24 18:14:34 -0500365 */
366void nfs_inode_return_delegation_noreclaim(struct inode *inode)
367{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000368 struct nfs_server *server = NFS_SERVER(inode);
Trond Myklebuste6f81072008-01-24 18:14:34 -0500369 struct nfs_inode *nfsi = NFS_I(inode);
370 struct nfs_delegation *delegation;
371
David Howells17d2c0a2010-05-01 12:37:18 -0400372 if (rcu_access_pointer(nfsi->delegation) != NULL) {
Chuck Leverd3978bb2010-12-24 01:33:04 +0000373 delegation = nfs_detach_delegation(nfsi, server);
Trond Myklebuste6f81072008-01-24 18:14:34 -0500374 if (delegation != NULL)
375 nfs_do_return_delegation(inode, delegation, 0);
376 }
377}
378
Chuck Leverd3978bb2010-12-24 01:33:04 +0000379/**
380 * nfs_inode_return_delegation - synchronously return a delegation
381 * @inode: inode to process
382 *
383 * Returns zero on success, or a negative errno value.
384 */
Trond Myklebust90163022007-07-05 14:55:18 -0400385int nfs_inode_return_delegation(struct inode *inode)
386{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000387 struct nfs_server *server = NFS_SERVER(inode);
Trond Myklebust90163022007-07-05 14:55:18 -0400388 struct nfs_inode *nfsi = NFS_I(inode);
389 struct nfs_delegation *delegation;
390 int err = 0;
391
David Howells17d2c0a2010-05-01 12:37:18 -0400392 if (rcu_access_pointer(nfsi->delegation) != NULL) {
Chuck Leverd3978bb2010-12-24 01:33:04 +0000393 delegation = nfs_detach_delegation(nfsi, server);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500394 if (delegation != NULL) {
Trond Myklebust1b924e52010-07-31 14:29:06 -0400395 nfs_wb_all(inode);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500396 err = __nfs_inode_return_delegation(inode, delegation, 1);
397 }
Trond Myklebust90163022007-07-05 14:55:18 -0400398 }
399 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
Trond Myklebusted1e6212011-07-25 15:37:29 -0400402static void nfs_mark_return_delegation(struct nfs_server *server,
403 struct nfs_delegation *delegation)
Trond Myklebust6411bd42008-12-23 15:21:51 -0500404{
405 set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
Trond Myklebusted1e6212011-07-25 15:37:29 -0400406 set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
Trond Myklebust6411bd42008-12-23 15:21:51 -0500407}
408
Chuck Leverd3978bb2010-12-24 01:33:04 +0000409/**
410 * nfs_super_return_all_delegations - return delegations for one superblock
411 * @sb: sb to process
412 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 */
Trond Myklebust515d8612008-12-23 15:21:46 -0500414void nfs_super_return_all_delegations(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000416 struct nfs_server *server = NFS_SB(sb);
417 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 struct nfs_delegation *delegation;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
420 if (clp == NULL)
421 return;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000422
Trond Myklebust8383e462007-07-06 15:12:04 -0400423 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000424 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Trond Myklebust86e89482008-12-23 15:21:39 -0500425 spin_lock(&delegation->lock);
Chuck Leverd3978bb2010-12-24 01:33:04 +0000426 set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
Trond Myklebust86e89482008-12-23 15:21:39 -0500427 spin_unlock(&delegation->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400429 rcu_read_unlock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000430
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500431 if (nfs_client_return_marked_delegations(clp) != 0)
432 nfs4_schedule_state_manager(clp);
Trond Myklebust515d8612008-12-23 15:21:46 -0500433}
434
Chuck Leverd3978bb2010-12-24 01:33:04 +0000435static void nfs_mark_return_all_delegation_types(struct nfs_server *server,
436 fmode_t flags)
Trond Myklebust515d8612008-12-23 15:21:46 -0500437{
438 struct nfs_delegation *delegation;
439
Chuck Leverd3978bb2010-12-24 01:33:04 +0000440 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Alexandros Batsakisc79571a2009-12-05 13:20:52 -0500441 if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE))
442 continue;
443 if (delegation->type & flags)
Trond Myklebusted1e6212011-07-25 15:37:29 -0400444 nfs_mark_return_delegation(server, delegation);
Trond Myklebust707fb4b2008-12-23 15:21:47 -0500445 }
Chuck Leverd3978bb2010-12-24 01:33:04 +0000446}
447
448static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp,
449 fmode_t flags)
450{
451 struct nfs_server *server;
452
453 rcu_read_lock();
454 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
455 nfs_mark_return_all_delegation_types(server, flags);
Trond Myklebust515d8612008-12-23 15:21:46 -0500456 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457}
458
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500459static void nfs_delegation_run_state_manager(struct nfs_client *clp)
Trond Myklebust58d9714a2006-01-03 09:55:24 +0100460{
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500461 if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state))
462 nfs4_schedule_state_manager(clp);
Trond Myklebust58d9714a2006-01-03 09:55:24 +0100463}
464
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -0500465void nfs_remove_bad_delegation(struct inode *inode)
466{
467 struct nfs_delegation *delegation;
468
469 delegation = nfs_detach_delegation(NFS_I(inode), NFS_SERVER(inode));
470 if (delegation) {
471 nfs_inode_find_state_and_recover(inode, &delegation->stateid);
472 nfs_free_delegation(delegation);
473 }
474}
Andy Adamson9cb81962012-03-07 10:49:41 -0500475EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation);
Trond Myklebusta1d0b5e2012-03-05 19:56:44 -0500476
Chuck Leverd3978bb2010-12-24 01:33:04 +0000477/**
478 * nfs_expire_all_delegation_types
479 * @clp: client to process
480 * @flags: delegation types to expire
481 *
482 */
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500483void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags)
Alexandros Batsakisc79571a2009-12-05 13:20:52 -0500484{
485 nfs_client_mark_return_all_delegation_types(clp, flags);
486 nfs_delegation_run_state_manager(clp);
487}
488
Chuck Leverd3978bb2010-12-24 01:33:04 +0000489/**
490 * nfs_expire_all_delegations
491 * @clp: client to process
492 *
493 */
David Howellsadfa6f92006-08-22 20:06:08 -0400494void nfs_expire_all_delegations(struct nfs_client *clp)
Trond Myklebust58d9714a2006-01-03 09:55:24 +0100495{
Alexandros Batsakisc79571a2009-12-05 13:20:52 -0500496 nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE);
Trond Myklebust58d9714a2006-01-03 09:55:24 +0100497}
498
Chuck Leverd3978bb2010-12-24 01:33:04 +0000499static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server)
Trond Myklebustb7391f42008-12-23 15:21:52 -0500500{
501 struct nfs_delegation *delegation;
502
Chuck Leverd3978bb2010-12-24 01:33:04 +0000503 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Trond Myklebustb7391f42008-12-23 15:21:52 -0500504 if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags))
505 continue;
Trond Myklebusted1e6212011-07-25 15:37:29 -0400506 nfs_mark_return_delegation(server, delegation);
Trond Myklebustb7391f42008-12-23 15:21:52 -0500507 }
Trond Myklebustb7391f42008-12-23 15:21:52 -0500508}
509
Chuck Leverd3978bb2010-12-24 01:33:04 +0000510/**
511 * nfs_expire_unreferenced_delegations - Eliminate unused delegations
512 * @clp: nfs_client to process
513 *
514 */
Trond Myklebustb7391f42008-12-23 15:21:52 -0500515void nfs_expire_unreferenced_delegations(struct nfs_client *clp)
516{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000517 struct nfs_server *server;
518
519 rcu_read_lock();
520 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
521 nfs_mark_return_unreferenced_delegations(server);
522 rcu_read_unlock();
523
Trond Myklebustb7391f42008-12-23 15:21:52 -0500524 nfs_delegation_run_state_manager(clp);
525}
526
Chuck Leverd3978bb2010-12-24 01:33:04 +0000527/**
528 * nfs_async_inode_return_delegation - asynchronously return a delegation
529 * @inode: inode to process
Trond Myklebust8e663f02012-03-04 18:13:56 -0500530 * @stateid: state ID information
Chuck Leverd3978bb2010-12-24 01:33:04 +0000531 *
532 * Returns zero on success, or a negative errno value.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 */
Chuck Leverd3978bb2010-12-24 01:33:04 +0000534int nfs_async_inode_return_delegation(struct inode *inode,
535 const nfs4_stateid *stateid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536{
Trond Myklebusted1e6212011-07-25 15:37:29 -0400537 struct nfs_server *server = NFS_SERVER(inode);
538 struct nfs_client *clp = server->nfs_client;
Trond Myklebust6411bd42008-12-23 15:21:51 -0500539 struct nfs_delegation *delegation;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
Trond Myklebust6411bd42008-12-23 15:21:51 -0500541 rcu_read_lock();
542 delegation = rcu_dereference(NFS_I(inode)->delegation);
Alexandros Batsakis25976412009-12-05 13:48:55 -0500543
Trond Myklebust36281ca2012-03-04 18:13:56 -0500544 if (!clp->cl_mvops->match_stateid(&delegation->stateid, stateid)) {
Trond Myklebust6411bd42008-12-23 15:21:51 -0500545 rcu_read_unlock();
546 return -ENOENT;
547 }
Trond Myklebusted1e6212011-07-25 15:37:29 -0400548 nfs_mark_return_delegation(server, delegation);
Trond Myklebust6411bd42008-12-23 15:21:51 -0500549 rcu_read_unlock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000550
Trond Myklebust6411bd42008-12-23 15:21:51 -0500551 nfs_delegation_run_state_manager(clp);
552 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553}
554
Chuck Leverd3978bb2010-12-24 01:33:04 +0000555static struct inode *
556nfs_delegation_find_inode_server(struct nfs_server *server,
557 const struct nfs_fh *fhandle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558{
559 struct nfs_delegation *delegation;
560 struct inode *res = NULL;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000561
562 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Trond Myklebust86e89482008-12-23 15:21:39 -0500563 spin_lock(&delegation->lock);
564 if (delegation->inode != NULL &&
565 nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 res = igrab(delegation->inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 }
Trond Myklebust86e89482008-12-23 15:21:39 -0500568 spin_unlock(&delegation->lock);
569 if (res != NULL)
570 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 }
Chuck Leverd3978bb2010-12-24 01:33:04 +0000572 return res;
573}
574
575/**
576 * nfs_delegation_find_inode - retrieve the inode associated with a delegation
577 * @clp: client state handle
578 * @fhandle: filehandle from a delegation recall
579 *
580 * Returns pointer to inode matching "fhandle," or NULL if a matching inode
581 * cannot be found.
582 */
583struct inode *nfs_delegation_find_inode(struct nfs_client *clp,
584 const struct nfs_fh *fhandle)
585{
586 struct nfs_server *server;
587 struct inode *res = NULL;
588
589 rcu_read_lock();
590 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
591 res = nfs_delegation_find_inode_server(server, fhandle);
592 if (res != NULL)
593 break;
594 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400595 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 return res;
597}
598
Chuck Leverd3978bb2010-12-24 01:33:04 +0000599static void nfs_delegation_mark_reclaim_server(struct nfs_server *server)
600{
601 struct nfs_delegation *delegation;
602
603 list_for_each_entry_rcu(delegation, &server->delegations, super_list)
604 set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
605}
606
607/**
608 * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed
609 * @clp: nfs_client to process
610 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 */
David Howellsadfa6f92006-08-22 20:06:08 -0400612void nfs_delegation_mark_reclaim(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000614 struct nfs_server *server;
615
Trond Myklebust8383e462007-07-06 15:12:04 -0400616 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000617 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
618 nfs_delegation_mark_reclaim_server(server);
Trond Myklebust8383e462007-07-06 15:12:04 -0400619 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620}
621
Chuck Leverd3978bb2010-12-24 01:33:04 +0000622/**
623 * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done
624 * @clp: nfs_client to process
625 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 */
David Howellsadfa6f92006-08-22 20:06:08 -0400627void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628{
Trond Myklebust8383e462007-07-06 15:12:04 -0400629 struct nfs_delegation *delegation;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000630 struct nfs_server *server;
Trond Myklebust86e89482008-12-23 15:21:39 -0500631 struct inode *inode;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000632
Trond Myklebust8383e462007-07-06 15:12:04 -0400633restart:
634 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000635 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
636 list_for_each_entry_rcu(delegation, &server->delegations,
637 super_list) {
638 if (test_bit(NFS_DELEGATION_NEED_RECLAIM,
639 &delegation->flags) == 0)
640 continue;
641 inode = nfs_delegation_grab_inode(delegation);
642 if (inode == NULL)
643 continue;
644 delegation = nfs_detach_delegation(NFS_I(inode),
645 server);
646 rcu_read_unlock();
647
648 if (delegation != NULL)
649 nfs_free_delegation(delegation);
650 iput(inode);
651 goto restart;
652 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400654 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655}
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500656
Chuck Leverd3978bb2010-12-24 01:33:04 +0000657/**
658 * nfs_delegations_present - check for existence of delegations
659 * @clp: client state handle
660 *
661 * Returns one if there are any nfs_delegation structures attached
662 * to this nfs_client.
663 */
664int nfs_delegations_present(struct nfs_client *clp)
665{
666 struct nfs_server *server;
667 int ret = 0;
668
669 rcu_read_lock();
670 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
671 if (!list_empty(&server->delegations)) {
672 ret = 1;
673 break;
674 }
675 rcu_read_unlock();
676 return ret;
677}
678
679/**
680 * nfs4_copy_delegation_stateid - Copy inode's state ID information
681 * @dst: stateid data structure to fill in
682 * @inode: inode to check
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500683 * @flags: delegation type requirement
Chuck Leverd3978bb2010-12-24 01:33:04 +0000684 *
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500685 * Returns "true" and fills in "dst->data" * if inode had a delegation,
686 * otherwise "false" is returned.
Chuck Leverd3978bb2010-12-24 01:33:04 +0000687 */
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500688bool nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode,
689 fmode_t flags)
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500690{
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500691 struct nfs_inode *nfsi = NFS_I(inode);
692 struct nfs_delegation *delegation;
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500693 bool ret;
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500694
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500695 flags &= FMODE_READ|FMODE_WRITE;
Trond Myklebust8383e462007-07-06 15:12:04 -0400696 rcu_read_lock();
697 delegation = rcu_dereference(nfsi->delegation);
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500698 ret = (delegation != NULL && (delegation->type & flags) == flags);
699 if (ret) {
Trond Myklebustf597c532012-03-04 18:13:56 -0500700 nfs4_stateid_copy(dst, &delegation->stateid);
Trond Myklebust0032a7a2012-03-08 17:16:12 -0500701 nfs_mark_delegation_referenced(delegation);
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500702 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400703 rcu_read_unlock();
704 return ret;
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500705}