blob: 7f2654069806f011c4361900041ef6ae64f17de4 [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 */
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 Myklebust90163022007-07-05 14:55:18 -0400108 if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0)
109 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) {
142 memcpy(delegation->stateid.data, res->delegation.data,
143 sizeof(delegation->stateid.data));
144 delegation->type = res->delegation_type;
145 delegation->maxsize = res->maxsize;
146 oldcred = delegation->cred;
147 delegation->cred = get_rpccred(cred);
148 clear_bit(NFS_DELEGATION_NEED_RECLAIM,
149 &delegation->flags);
150 NFS_I(inode)->delegation_state = delegation->type;
151 spin_unlock(&delegation->lock);
152 put_rpccred(oldcred);
153 rcu_read_unlock();
154 } else {
155 /* We appear to have raced with a delegation return. */
156 spin_unlock(&delegation->lock);
157 rcu_read_unlock();
158 nfs_inode_set_delegation(inode, cred, res);
159 }
160 } else {
161 rcu_read_unlock();
162 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
Trond Myklebust57bfa892008-01-25 16:38:18 -0500165static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync)
166{
167 int res = 0;
168
169 res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync);
170 nfs_free_delegation(delegation);
171 return res;
172}
173
Trond Myklebust86e89482008-12-23 15:21:39 -0500174static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation)
175{
176 struct inode *inode = NULL;
177
178 spin_lock(&delegation->lock);
179 if (delegation->inode != NULL)
180 inode = igrab(delegation->inode);
181 spin_unlock(&delegation->lock);
182 return inode;
183}
184
Chuck Leverdda4b222010-12-24 01:32:54 +0000185static struct nfs_delegation *
186nfs_detach_delegation_locked(struct nfs_inode *nfsi,
Chuck Leverd3978bb2010-12-24 01:33:04 +0000187 struct nfs_server *server)
Trond Myklebust57bfa892008-01-25 16:38:18 -0500188{
David Howells17d2c0a2010-05-01 12:37:18 -0400189 struct nfs_delegation *delegation =
190 rcu_dereference_protected(nfsi->delegation,
Chuck Leverd3978bb2010-12-24 01:33:04 +0000191 lockdep_is_held(&server->nfs_client->cl_lock));
Trond Myklebust57bfa892008-01-25 16:38:18 -0500192
193 if (delegation == NULL)
194 goto nomatch;
Chuck Leverdda4b222010-12-24 01:32:54 +0000195
Trond Myklebust34310432008-12-23 15:21:38 -0500196 spin_lock(&delegation->lock);
Trond Myklebust57bfa892008-01-25 16:38:18 -0500197 list_del_rcu(&delegation->super_list);
Trond Myklebust86e89482008-12-23 15:21:39 -0500198 delegation->inode = NULL;
Trond Myklebust57bfa892008-01-25 16:38:18 -0500199 nfsi->delegation_state = 0;
200 rcu_assign_pointer(nfsi->delegation, NULL);
Trond Myklebust34310432008-12-23 15:21:38 -0500201 spin_unlock(&delegation->lock);
Trond Myklebust57bfa892008-01-25 16:38:18 -0500202 return delegation;
203nomatch:
204 return NULL;
205}
206
Chuck Leverdda4b222010-12-24 01:32:54 +0000207static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi,
Chuck Leverd3978bb2010-12-24 01:33:04 +0000208 struct nfs_server *server)
Chuck Leverdda4b222010-12-24 01:32:54 +0000209{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000210 struct nfs_client *clp = server->nfs_client;
Chuck Leverdda4b222010-12-24 01:32:54 +0000211 struct nfs_delegation *delegation;
212
213 spin_lock(&clp->cl_lock);
Chuck Leverd3978bb2010-12-24 01:33:04 +0000214 delegation = nfs_detach_delegation_locked(nfsi, server);
Chuck Leverdda4b222010-12-24 01:32:54 +0000215 spin_unlock(&clp->cl_lock);
216 return delegation;
217}
218
Chuck Leverd3978bb2010-12-24 01:33:04 +0000219/**
220 * nfs_inode_set_delegation - set up a delegation on an inode
221 * @inode: inode to which delegation applies
222 * @cred: cred to use for subsequent delegation processing
223 * @res: new delegation state from server
224 *
225 * Returns zero on success, or a negative errno value.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 */
227int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res)
228{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000229 struct nfs_server *server = NFS_SERVER(inode);
230 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 struct nfs_inode *nfsi = NFS_I(inode);
David Howells17d2c0a2010-05-01 12:37:18 -0400232 struct nfs_delegation *delegation, *old_delegation;
Trond Myklebust57bfa892008-01-25 16:38:18 -0500233 struct nfs_delegation *freeme = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 int status = 0;
235
Trond Myklebust8535b2b2010-05-13 12:51:01 -0400236 delegation = kmalloc(sizeof(*delegation), GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 if (delegation == NULL)
238 return -ENOMEM;
239 memcpy(delegation->stateid.data, res->delegation.data,
240 sizeof(delegation->stateid.data));
241 delegation->type = res->delegation_type;
242 delegation->maxsize = res->maxsize;
Trond Myklebusta9a4a872011-10-17 16:08:46 -0700243 delegation->change_attr = inode->i_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 delegation->cred = get_rpccred(cred);
245 delegation->inode = inode;
Trond Myklebustb7391f42008-12-23 15:21:52 -0500246 delegation->flags = 1<<NFS_DELEGATION_REFERENCED;
Trond Myklebust34310432008-12-23 15:21:38 -0500247 spin_lock_init(&delegation->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
249 spin_lock(&clp->cl_lock);
David Howells17d2c0a2010-05-01 12:37:18 -0400250 old_delegation = rcu_dereference_protected(nfsi->delegation,
Chuck Leverd3978bb2010-12-24 01:33:04 +0000251 lockdep_is_held(&clp->cl_lock));
David Howells17d2c0a2010-05-01 12:37:18 -0400252 if (old_delegation != NULL) {
253 if (memcmp(&delegation->stateid, &old_delegation->stateid,
254 sizeof(old_delegation->stateid)) == 0 &&
255 delegation->type == old_delegation->type) {
Trond Myklebust57bfa892008-01-25 16:38:18 -0500256 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 }
Trond Myklebust57bfa892008-01-25 16:38:18 -0500258 /*
259 * Deal with broken servers that hand out two
260 * delegations for the same file.
261 */
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);
David Howells17d2c0a2010-05-01 12:37:18 -0400265 if (delegation->type <= old_delegation->type) {
Trond Myklebust57bfa892008-01-25 16:38:18 -0500266 freeme = delegation;
267 delegation = NULL;
268 goto out;
269 }
Chuck Leverd3978bb2010-12-24 01:33:04 +0000270 freeme = nfs_detach_delegation_locked(nfsi, server);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 }
Chuck Leverd3978bb2010-12-24 01:33:04 +0000272 list_add_rcu(&delegation->super_list, &server->delegations);
Trond Myklebust57bfa892008-01-25 16:38:18 -0500273 nfsi->delegation_state = delegation->type;
274 rcu_assign_pointer(nfsi->delegation, delegation);
275 delegation = NULL;
Trond Myklebust412c77c2007-07-03 16:10:55 -0400276
277 /* Ensure we revalidate the attributes and page cache! */
278 spin_lock(&inode->i_lock);
279 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
280 spin_unlock(&inode->i_lock);
281
Trond Myklebust57bfa892008-01-25 16:38:18 -0500282out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 spin_unlock(&clp->cl_lock);
Trond Myklebust603c83d2007-10-18 19:59:20 -0400284 if (delegation != NULL)
285 nfs_free_delegation(delegation);
Trond Myklebust57bfa892008-01-25 16:38:18 -0500286 if (freeme != NULL)
287 nfs_do_return_delegation(inode, freeme, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 return status;
289}
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291/*
292 * Basic procedure for returning a delegation to the server
293 */
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500294static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500297 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Trond Myklebust3f09df72009-06-17 13:23:00 -0700299 /*
300 * Guard against new delegated open/lock/unlock calls and against
301 * state recovery
302 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 down_write(&nfsi->rwsem);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500304 err = nfs_delegation_claim_opens(inode, &delegation->stateid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 up_write(&nfsi->rwsem);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500306 if (err)
307 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500309 err = nfs_do_return_delegation(inode, delegation, issync);
310out:
311 return err;
Trond Myklebust90163022007-07-05 14:55:18 -0400312}
313
Chuck Leverd3978bb2010-12-24 01:33:04 +0000314/**
315 * nfs_client_return_marked_delegations - return previously marked delegations
316 * @clp: nfs_client to process
317 *
318 * Returns zero on success, or a negative errno value.
Trond Myklebust515d8612008-12-23 15:21:46 -0500319 */
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500320int nfs_client_return_marked_delegations(struct nfs_client *clp)
Trond Myklebust515d8612008-12-23 15:21:46 -0500321{
322 struct nfs_delegation *delegation;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000323 struct nfs_server *server;
Trond Myklebust515d8612008-12-23 15:21:46 -0500324 struct inode *inode;
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500325 int err = 0;
Trond Myklebust515d8612008-12-23 15:21:46 -0500326
327restart:
328 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000329 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
330 list_for_each_entry_rcu(delegation, &server->delegations,
331 super_list) {
332 if (!test_and_clear_bit(NFS_DELEGATION_RETURN,
333 &delegation->flags))
334 continue;
335 inode = nfs_delegation_grab_inode(delegation);
336 if (inode == NULL)
337 continue;
338 delegation = nfs_detach_delegation(NFS_I(inode),
339 server);
340 rcu_read_unlock();
341
342 if (delegation != NULL) {
343 filemap_flush(inode->i_mapping);
344 err = __nfs_inode_return_delegation(inode,
345 delegation, 0);
346 }
347 iput(inode);
348 if (!err)
349 goto restart;
350 set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
351 return err;
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500352 }
Trond Myklebust515d8612008-12-23 15:21:46 -0500353 }
354 rcu_read_unlock();
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500355 return 0;
Trond Myklebust515d8612008-12-23 15:21:46 -0500356}
357
Chuck Leverd3978bb2010-12-24 01:33:04 +0000358/**
359 * nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens
360 * @inode: inode to process
361 *
362 * Does not protect against delegation reclaims, therefore really only safe
363 * to be called from nfs4_clear_inode().
Trond Myklebuste6f81072008-01-24 18:14:34 -0500364 */
365void nfs_inode_return_delegation_noreclaim(struct inode *inode)
366{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000367 struct nfs_server *server = NFS_SERVER(inode);
Trond Myklebuste6f81072008-01-24 18:14:34 -0500368 struct nfs_inode *nfsi = NFS_I(inode);
369 struct nfs_delegation *delegation;
370
David Howells17d2c0a2010-05-01 12:37:18 -0400371 if (rcu_access_pointer(nfsi->delegation) != NULL) {
Chuck Leverd3978bb2010-12-24 01:33:04 +0000372 delegation = nfs_detach_delegation(nfsi, server);
Trond Myklebuste6f81072008-01-24 18:14:34 -0500373 if (delegation != NULL)
374 nfs_do_return_delegation(inode, delegation, 0);
375 }
376}
377
Chuck Leverd3978bb2010-12-24 01:33:04 +0000378/**
379 * nfs_inode_return_delegation - synchronously return a delegation
380 * @inode: inode to process
381 *
382 * Returns zero on success, or a negative errno value.
383 */
Trond Myklebust90163022007-07-05 14:55:18 -0400384int nfs_inode_return_delegation(struct inode *inode)
385{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000386 struct nfs_server *server = NFS_SERVER(inode);
Trond Myklebust90163022007-07-05 14:55:18 -0400387 struct nfs_inode *nfsi = NFS_I(inode);
388 struct nfs_delegation *delegation;
389 int err = 0;
390
David Howells17d2c0a2010-05-01 12:37:18 -0400391 if (rcu_access_pointer(nfsi->delegation) != NULL) {
Chuck Leverd3978bb2010-12-24 01:33:04 +0000392 delegation = nfs_detach_delegation(nfsi, server);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500393 if (delegation != NULL) {
Trond Myklebust1b924e52010-07-31 14:29:06 -0400394 nfs_wb_all(inode);
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500395 err = __nfs_inode_return_delegation(inode, delegation, 1);
396 }
Trond Myklebust90163022007-07-05 14:55:18 -0400397 }
398 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399}
400
Trond Myklebusted1e6212011-07-25 15:37:29 -0400401static void nfs_mark_return_delegation(struct nfs_server *server,
402 struct nfs_delegation *delegation)
Trond Myklebust6411bd42008-12-23 15:21:51 -0500403{
404 set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
Trond Myklebusted1e6212011-07-25 15:37:29 -0400405 set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
Trond Myklebust6411bd42008-12-23 15:21:51 -0500406}
407
Chuck Leverd3978bb2010-12-24 01:33:04 +0000408/**
409 * nfs_super_return_all_delegations - return delegations for one superblock
410 * @sb: sb to process
411 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 */
Trond Myklebust515d8612008-12-23 15:21:46 -0500413void nfs_super_return_all_delegations(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000415 struct nfs_server *server = NFS_SB(sb);
416 struct nfs_client *clp = server->nfs_client;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 struct nfs_delegation *delegation;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
419 if (clp == NULL)
420 return;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000421
Trond Myklebust8383e462007-07-06 15:12:04 -0400422 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000423 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Trond Myklebust86e89482008-12-23 15:21:39 -0500424 spin_lock(&delegation->lock);
Chuck Leverd3978bb2010-12-24 01:33:04 +0000425 set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
Trond Myklebust86e89482008-12-23 15:21:39 -0500426 spin_unlock(&delegation->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400428 rcu_read_unlock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000429
Trond Myklebustd18cc1f2009-12-03 08:10:17 -0500430 if (nfs_client_return_marked_delegations(clp) != 0)
431 nfs4_schedule_state_manager(clp);
Trond Myklebust515d8612008-12-23 15:21:46 -0500432}
433
Chuck Leverd3978bb2010-12-24 01:33:04 +0000434static void nfs_mark_return_all_delegation_types(struct nfs_server *server,
435 fmode_t flags)
Trond Myklebust515d8612008-12-23 15:21:46 -0500436{
437 struct nfs_delegation *delegation;
438
Chuck Leverd3978bb2010-12-24 01:33:04 +0000439 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Alexandros Batsakisc79571a2009-12-05 13:20:52 -0500440 if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE))
441 continue;
442 if (delegation->type & flags)
Trond Myklebusted1e6212011-07-25 15:37:29 -0400443 nfs_mark_return_delegation(server, delegation);
Trond Myklebust707fb4b2008-12-23 15:21:47 -0500444 }
Chuck Leverd3978bb2010-12-24 01:33:04 +0000445}
446
447static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp,
448 fmode_t flags)
449{
450 struct nfs_server *server;
451
452 rcu_read_lock();
453 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
454 nfs_mark_return_all_delegation_types(server, flags);
Trond Myklebust515d8612008-12-23 15:21:46 -0500455 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456}
457
Alexandros Batsakisc79571a2009-12-05 13:20:52 -0500458static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
459{
460 nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE);
461}
462
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500463static void nfs_delegation_run_state_manager(struct nfs_client *clp)
Trond Myklebust58d97142006-01-03 09:55:24 +0100464{
Trond Myklebustb0d3ded2008-12-23 15:21:50 -0500465 if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state))
466 nfs4_schedule_state_manager(clp);
Trond Myklebust58d97142006-01-03 09:55:24 +0100467}
468
Chuck Leverd3978bb2010-12-24 01:33:04 +0000469/**
470 * nfs_expire_all_delegation_types
471 * @clp: client to process
472 * @flags: delegation types to expire
473 *
474 */
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500475void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags)
Alexandros Batsakisc79571a2009-12-05 13:20:52 -0500476{
477 nfs_client_mark_return_all_delegation_types(clp, flags);
478 nfs_delegation_run_state_manager(clp);
479}
480
Chuck Leverd3978bb2010-12-24 01:33:04 +0000481/**
482 * nfs_expire_all_delegations
483 * @clp: client to process
484 *
485 */
David Howellsadfa6f92006-08-22 20:06:08 -0400486void nfs_expire_all_delegations(struct nfs_client *clp)
Trond Myklebust58d97142006-01-03 09:55:24 +0100487{
Alexandros Batsakisc79571a2009-12-05 13:20:52 -0500488 nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE);
Trond Myklebust58d97142006-01-03 09:55:24 +0100489}
490
Chuck Leverd3978bb2010-12-24 01:33:04 +0000491/**
492 * nfs_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
493 * @clp: client to process
494 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 */
David Howellsadfa6f92006-08-22 20:06:08 -0400496void nfs_handle_cb_pathdown(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 if (clp == NULL)
499 return;
Trond Myklebust707fb4b2008-12-23 15:21:47 -0500500 nfs_client_mark_return_all_delegations(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501}
502
Chuck Leverd3978bb2010-12-24 01:33:04 +0000503static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server)
Trond Myklebustb7391f42008-12-23 15:21:52 -0500504{
505 struct nfs_delegation *delegation;
506
Chuck Leverd3978bb2010-12-24 01:33:04 +0000507 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Trond Myklebustb7391f42008-12-23 15:21:52 -0500508 if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags))
509 continue;
Trond Myklebusted1e6212011-07-25 15:37:29 -0400510 nfs_mark_return_delegation(server, delegation);
Trond Myklebustb7391f42008-12-23 15:21:52 -0500511 }
Trond Myklebustb7391f42008-12-23 15:21:52 -0500512}
513
Chuck Leverd3978bb2010-12-24 01:33:04 +0000514/**
515 * nfs_expire_unreferenced_delegations - Eliminate unused delegations
516 * @clp: nfs_client to process
517 *
518 */
Trond Myklebustb7391f42008-12-23 15:21:52 -0500519void nfs_expire_unreferenced_delegations(struct nfs_client *clp)
520{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000521 struct nfs_server *server;
522
523 rcu_read_lock();
524 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
525 nfs_mark_return_unreferenced_delegations(server);
526 rcu_read_unlock();
527
Trond Myklebustb7391f42008-12-23 15:21:52 -0500528 nfs_delegation_run_state_manager(clp);
529}
530
Chuck Leverd3978bb2010-12-24 01:33:04 +0000531/**
532 * nfs_async_inode_return_delegation - asynchronously return a delegation
533 * @inode: inode to process
534 * @stateid: state ID information from CB_RECALL arguments
535 *
536 * Returns zero on success, or a negative errno value.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 */
Chuck Leverd3978bb2010-12-24 01:33:04 +0000538int nfs_async_inode_return_delegation(struct inode *inode,
539 const nfs4_stateid *stateid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540{
Trond Myklebusted1e6212011-07-25 15:37:29 -0400541 struct nfs_server *server = NFS_SERVER(inode);
542 struct nfs_client *clp = server->nfs_client;
Trond Myklebust6411bd42008-12-23 15:21:51 -0500543 struct nfs_delegation *delegation;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Trond Myklebust6411bd42008-12-23 15:21:51 -0500545 rcu_read_lock();
546 delegation = rcu_dereference(NFS_I(inode)->delegation);
Alexandros Batsakis25976412009-12-05 13:48:55 -0500547
Trond Myklebuste047a102010-06-16 09:52:27 -0400548 if (!clp->cl_mvops->validate_stateid(delegation, stateid)) {
Trond Myklebust6411bd42008-12-23 15:21:51 -0500549 rcu_read_unlock();
550 return -ENOENT;
551 }
Trond Myklebusted1e6212011-07-25 15:37:29 -0400552 nfs_mark_return_delegation(server, delegation);
Trond Myklebust6411bd42008-12-23 15:21:51 -0500553 rcu_read_unlock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000554
Trond Myklebust6411bd42008-12-23 15:21:51 -0500555 nfs_delegation_run_state_manager(clp);
556 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
558
Chuck Leverd3978bb2010-12-24 01:33:04 +0000559static struct inode *
560nfs_delegation_find_inode_server(struct nfs_server *server,
561 const struct nfs_fh *fhandle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562{
563 struct nfs_delegation *delegation;
564 struct inode *res = NULL;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000565
566 list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
Trond Myklebust86e89482008-12-23 15:21:39 -0500567 spin_lock(&delegation->lock);
568 if (delegation->inode != NULL &&
569 nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 res = igrab(delegation->inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 }
Trond Myklebust86e89482008-12-23 15:21:39 -0500572 spin_unlock(&delegation->lock);
573 if (res != NULL)
574 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 }
Chuck Leverd3978bb2010-12-24 01:33:04 +0000576 return res;
577}
578
579/**
580 * nfs_delegation_find_inode - retrieve the inode associated with a delegation
581 * @clp: client state handle
582 * @fhandle: filehandle from a delegation recall
583 *
584 * Returns pointer to inode matching "fhandle," or NULL if a matching inode
585 * cannot be found.
586 */
587struct inode *nfs_delegation_find_inode(struct nfs_client *clp,
588 const struct nfs_fh *fhandle)
589{
590 struct nfs_server *server;
591 struct inode *res = NULL;
592
593 rcu_read_lock();
594 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
595 res = nfs_delegation_find_inode_server(server, fhandle);
596 if (res != NULL)
597 break;
598 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400599 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 return res;
601}
602
Chuck Leverd3978bb2010-12-24 01:33:04 +0000603static void nfs_delegation_mark_reclaim_server(struct nfs_server *server)
604{
605 struct nfs_delegation *delegation;
606
607 list_for_each_entry_rcu(delegation, &server->delegations, super_list)
608 set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
609}
610
611/**
612 * nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed
613 * @clp: nfs_client to process
614 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 */
David Howellsadfa6f92006-08-22 20:06:08 -0400616void nfs_delegation_mark_reclaim(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617{
Chuck Leverd3978bb2010-12-24 01:33:04 +0000618 struct nfs_server *server;
619
Trond Myklebust8383e462007-07-06 15:12:04 -0400620 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000621 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
622 nfs_delegation_mark_reclaim_server(server);
Trond Myklebust8383e462007-07-06 15:12:04 -0400623 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624}
625
Chuck Leverd3978bb2010-12-24 01:33:04 +0000626/**
627 * nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done
628 * @clp: nfs_client to process
629 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 */
David Howellsadfa6f92006-08-22 20:06:08 -0400631void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
Trond Myklebust8383e462007-07-06 15:12:04 -0400633 struct nfs_delegation *delegation;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000634 struct nfs_server *server;
Trond Myklebust86e89482008-12-23 15:21:39 -0500635 struct inode *inode;
Chuck Leverd3978bb2010-12-24 01:33:04 +0000636
Trond Myklebust8383e462007-07-06 15:12:04 -0400637restart:
638 rcu_read_lock();
Chuck Leverd3978bb2010-12-24 01:33:04 +0000639 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
640 list_for_each_entry_rcu(delegation, &server->delegations,
641 super_list) {
642 if (test_bit(NFS_DELEGATION_NEED_RECLAIM,
643 &delegation->flags) == 0)
644 continue;
645 inode = nfs_delegation_grab_inode(delegation);
646 if (inode == NULL)
647 continue;
648 delegation = nfs_detach_delegation(NFS_I(inode),
649 server);
650 rcu_read_unlock();
651
652 if (delegation != NULL)
653 nfs_free_delegation(delegation);
654 iput(inode);
655 goto restart;
656 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 }
Trond Myklebust8383e462007-07-06 15:12:04 -0400658 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659}
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500660
Chuck Leverd3978bb2010-12-24 01:33:04 +0000661/**
662 * nfs_delegations_present - check for existence of delegations
663 * @clp: client state handle
664 *
665 * Returns one if there are any nfs_delegation structures attached
666 * to this nfs_client.
667 */
668int nfs_delegations_present(struct nfs_client *clp)
669{
670 struct nfs_server *server;
671 int ret = 0;
672
673 rcu_read_lock();
674 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
675 if (!list_empty(&server->delegations)) {
676 ret = 1;
677 break;
678 }
679 rcu_read_unlock();
680 return ret;
681}
682
683/**
684 * nfs4_copy_delegation_stateid - Copy inode's state ID information
685 * @dst: stateid data structure to fill in
686 * @inode: inode to check
687 *
688 * Returns one and fills in "dst->data" * if inode had a delegation,
689 * otherwise zero is returned.
690 */
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500691int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode)
692{
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500693 struct nfs_inode *nfsi = NFS_I(inode);
694 struct nfs_delegation *delegation;
Trond Myklebust8383e462007-07-06 15:12:04 -0400695 int ret = 0;
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500696
Trond Myklebust8383e462007-07-06 15:12:04 -0400697 rcu_read_lock();
698 delegation = rcu_dereference(nfsi->delegation);
Trond Myklebust3e4f6292006-03-20 13:44:46 -0500699 if (delegation != NULL) {
700 memcpy(dst->data, delegation->stateid.data, sizeof(dst->data));
Trond Myklebust8383e462007-07-06 15:12:04 -0400701 ret = 1;
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}