blob: 29e3c1b011b73e4661f4deb1ef200e2f8d27792b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfs/callback_proc.c
3 *
4 * Copyright (C) 2004 Trond Myklebust
5 *
6 * NFSv4 callback procedures
7 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/nfs4.h>
9#include <linux/nfs_fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090010#include <linux/slab.h>
Trond Myklebust2446ab62012-03-01 17:00:56 -050011#include <linux/rcupdate.h>
Trond Myklebust4ce79712005-06-22 17:16:21 +000012#include "nfs4_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include "callback.h"
14#include "delegation.h"
David Howells24c8dbb2006-08-22 20:06:10 -040015#include "internal.h"
Fred Isaman43f1b3d2011-01-06 11:36:30 +000016#include "pnfs.h"
Trond Myklebust73e39aa2012-11-26 12:49:34 -050017#include "nfs4session.h"
Trond Myklebustca8acf82013-08-13 10:36:56 -040018#include "nfs4trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Chuck Lever1d98fe62007-12-10 14:57:23 -050020#ifdef NFS_DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#define NFSDBG_FACILITY NFSDBG_CALLBACK
Chuck Lever1d98fe62007-12-10 14:57:23 -050022#endif
Andy Adamsonc36fca52011-01-06 02:04:32 +000023
24__be32 nfs4_callback_getattr(struct cb_getattrargs *args,
25 struct cb_getattrres *res,
26 struct cb_process_state *cps)
Linus Torvalds1da177e2005-04-16 15:20:36 -070027{
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 struct nfs_delegation *delegation;
29 struct nfs_inode *nfsi;
30 struct inode *inode;
Chuck Lever1d98fe62007-12-10 14:57:23 -050031
Andy Adamsonc36fca52011-01-06 02:04:32 +000032 res->status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
33 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 goto out;
Chuck Lever1d98fe62007-12-10 14:57:23 -050035
Andy Adamsonc36fca52011-01-06 02:04:32 +000036 res->bitmap[0] = res->bitmap[1] = 0;
37 res->status = htonl(NFS4ERR_BADHANDLE);
Chuck Lever1d98fe62007-12-10 14:57:23 -050038
Trond Myklebust2446ab62012-03-01 17:00:56 -050039 dprintk_rcu("NFS: GETATTR callback request from %s\n",
Andy Adamsonc36fca52011-01-06 02:04:32 +000040 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
41
42 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 if (inode == NULL)
Andy Adamsonc36fca52011-01-06 02:04:32 +000044 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 nfsi = NFS_I(inode);
Trond Myklebust761fe932010-08-04 09:29:52 -040046 rcu_read_lock();
47 delegation = rcu_dereference(nfsi->delegation);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 if (delegation == NULL || (delegation->type & FMODE_WRITE) == 0)
49 goto out_iput;
50 res->size = i_size_read(inode);
Trond Myklebustbeb2a5e2006-01-03 09:55:37 +010051 res->change_attr = delegation->change_attr;
Weston Andros Adamsoncb1410c2014-11-12 12:08:00 -050052 if (nfsi->nrequests != 0)
Trond Myklebustbeb2a5e2006-01-03 09:55:37 +010053 res->change_attr++;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 res->ctime = inode->i_ctime;
55 res->mtime = inode->i_mtime;
56 res->bitmap[0] = (FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE) &
57 args->bitmap[0];
58 res->bitmap[1] = (FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY) &
59 args->bitmap[1];
60 res->status = 0;
61out_iput:
Trond Myklebust761fe932010-08-04 09:29:52 -040062 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 iput(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064out:
Harvey Harrison3110ff82008-05-02 13:42:44 -070065 dprintk("%s: exit with status = %d\n", __func__, ntohl(res->status));
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 return res->status;
67}
68
Andy Adamsonc36fca52011-01-06 02:04:32 +000069__be32 nfs4_callback_recall(struct cb_recallargs *args, void *dummy,
70 struct cb_process_state *cps)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 struct inode *inode;
Al Viroe6f684f2006-10-19 23:28:50 -070073 __be32 res;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Andy Adamsonc36fca52011-01-06 02:04:32 +000075 res = htonl(NFS4ERR_OP_NOT_IN_SESSION);
76 if (!cps->clp) /* Always set for v4.0. Set in cb_sequence for v4.1 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 goto out;
Chuck Lever1d98fe62007-12-10 14:57:23 -050078
Trond Myklebust2446ab62012-03-01 17:00:56 -050079 dprintk_rcu("NFS: RECALL callback request from %s\n",
Andy Adamsonc36fca52011-01-06 02:04:32 +000080 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
Chuck Lever1d98fe62007-12-10 14:57:23 -050081
Andy Adamsonc36fca52011-01-06 02:04:32 +000082 res = htonl(NFS4ERR_BADHANDLE);
83 inode = nfs_delegation_find_inode(cps->clp, &args->fh);
84 if (inode == NULL)
85 goto out;
86 /* Set up a helper thread to actually return the delegation */
87 switch (nfs_async_inode_return_delegation(inode, &args->stateid)) {
88 case 0:
89 res = 0;
90 break;
91 case -ENOENT:
Trond Myklebust8e663f02012-03-04 18:13:56 -050092 res = htonl(NFS4ERR_BAD_STATEID);
Andy Adamsonc36fca52011-01-06 02:04:32 +000093 break;
94 default:
95 res = htonl(NFS4ERR_RESOURCE);
96 }
Trond Myklebustca8acf82013-08-13 10:36:56 -040097 trace_nfs4_recall_delegation(inode, -ntohl(res));
Andy Adamsonc36fca52011-01-06 02:04:32 +000098 iput(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099out:
Harvey Harrison3110ff82008-05-02 13:42:44 -0700100 dprintk("%s: exit with status = %d\n", __func__, ntohl(res));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 return res;
102}
Benny Halevyd49433e2009-04-01 09:23:25 -0400103
104#if defined(CONFIG_NFS_V4_1)
105
Benny Halevyd36b7cf2012-01-22 16:03:39 +0200106/*
107 * Lookup a layout by filehandle.
108 *
109 * Note: gets a refcount on the layout hdr and on its respective inode.
110 * Caller must put the layout hdr and the inode.
111 *
112 * TODO: keep track of all layouts (and delegations) in a hash table
113 * hashed by filehandle.
114 */
Trond Myklebust27999f22014-02-12 08:12:42 -0500115static struct pnfs_layout_hdr * get_layout_by_fh_locked(struct nfs_client *clp,
116 struct nfs_fh *fh, nfs4_stateid *stateid)
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000117{
Weston Andros Adamson6382a442011-06-01 16:44:44 -0400118 struct nfs_server *server;
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000119 struct inode *ino;
Benny Halevyd36b7cf2012-01-22 16:03:39 +0200120 struct pnfs_layout_hdr *lo;
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000121
Weston Andros Adamson6382a442011-06-01 16:44:44 -0400122 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
123 list_for_each_entry(lo, &server->layouts, plh_layouts) {
Trond Myklebust27999f22014-02-12 08:12:42 -0500124 if (!nfs4_stateid_match_other(&lo->plh_stateid, stateid))
125 continue;
Benny Halevyd36b7cf2012-01-22 16:03:39 +0200126 if (nfs_compare_fh(fh, &NFS_I(lo->plh_inode)->fh))
Weston Andros Adamson6382a442011-06-01 16:44:44 -0400127 continue;
128 ino = igrab(lo->plh_inode);
129 if (!ino)
Trond Myklebust9a7fe9e82014-02-12 08:17:00 -0500130 break;
Trond Myklebust9c626382012-09-20 17:31:43 -0400131 spin_lock(&ino->i_lock);
132 /* Is this layout in the process of being freed? */
133 if (NFS_I(ino)->layout != lo) {
134 spin_unlock(&ino->i_lock);
135 iput(ino);
Trond Myklebust9a7fe9e82014-02-12 08:17:00 -0500136 break;
Trond Myklebust9c626382012-09-20 17:31:43 -0400137 }
Trond Myklebust70c3bd22012-09-18 20:51:13 -0400138 pnfs_get_layout_hdr(lo);
Trond Myklebust9c626382012-09-20 17:31:43 -0400139 spin_unlock(&ino->i_lock);
Benny Halevyd36b7cf2012-01-22 16:03:39 +0200140 return lo;
Weston Andros Adamson6382a442011-06-01 16:44:44 -0400141 }
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000142 }
Benny Halevyd36b7cf2012-01-22 16:03:39 +0200143
144 return NULL;
145}
146
Trond Myklebust27999f22014-02-12 08:12:42 -0500147static struct pnfs_layout_hdr * get_layout_by_fh(struct nfs_client *clp,
148 struct nfs_fh *fh, nfs4_stateid *stateid)
Benny Halevyd36b7cf2012-01-22 16:03:39 +0200149{
150 struct pnfs_layout_hdr *lo;
151
152 spin_lock(&clp->cl_lock);
153 rcu_read_lock();
Trond Myklebust27999f22014-02-12 08:12:42 -0500154 lo = get_layout_by_fh_locked(clp, fh, stateid);
Weston Andros Adamson6382a442011-06-01 16:44:44 -0400155 rcu_read_unlock();
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000156 spin_unlock(&clp->cl_lock);
Weston Andros Adamson6382a442011-06-01 16:44:44 -0400157
Benny Halevyd36b7cf2012-01-22 16:03:39 +0200158 return lo;
159}
160
161static u32 initiate_file_draining(struct nfs_client *clp,
162 struct cb_layoutrecallargs *args)
163{
164 struct inode *ino;
165 struct pnfs_layout_hdr *lo;
166 u32 rv = NFS4ERR_NOMATCHING_LAYOUT;
167 LIST_HEAD(free_me_list);
168
Trond Myklebust27999f22014-02-12 08:12:42 -0500169 lo = get_layout_by_fh(clp, &args->cbl_fh, &args->cbl_stateid);
Benny Halevyd36b7cf2012-01-22 16:03:39 +0200170 if (!lo)
Trond Myklebust27999f22014-02-12 08:12:42 -0500171 goto out;
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000172
Benny Halevyd36b7cf2012-01-22 16:03:39 +0200173 ino = lo->plh_inode;
Christoph Hellwig7c5d1872014-09-10 08:23:29 -0700174
175 spin_lock(&ino->i_lock);
176 pnfs_set_layout_stateid(lo, &args->cbl_stateid, true);
177 spin_unlock(&ino->i_lock);
178
179 pnfs_layoutcommit_inode(ino, false);
180
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000181 spin_lock(&ino->i_lock);
182 if (test_bit(NFS_LAYOUT_BULK_RECALL, &lo->plh_flags) ||
Trond Myklebust49a85062012-09-18 20:43:31 -0400183 pnfs_mark_matching_lsegs_invalid(lo, &free_me_list,
Christoph Hellwigc88953d2014-09-10 08:23:31 -0700184 &args->cbl_range)) {
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000185 rv = NFS4ERR_DELAY;
Christoph Hellwigc88953d2014-09-10 08:23:31 -0700186 goto unlock;
187 }
188
189 if (NFS_SERVER(ino)->pnfs_curr_ld->return_range) {
190 NFS_SERVER(ino)->pnfs_curr_ld->return_range(lo,
191 &args->cbl_range);
192 }
193unlock:
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000194 spin_unlock(&ino->i_lock);
195 pnfs_free_lseg_list(&free_me_list);
Trond Myklebust70c3bd22012-09-18 20:51:13 -0400196 pnfs_put_layout_hdr(lo);
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000197 iput(ino);
Trond Myklebust27999f22014-02-12 08:12:42 -0500198out:
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000199 return rv;
200}
201
202static u32 initiate_bulk_draining(struct nfs_client *clp,
203 struct cb_layoutrecallargs *args)
204{
Trond Myklebustfd9a8d72013-02-12 09:48:42 -0500205 int stat;
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000206
Trond Myklebustfd9a8d72013-02-12 09:48:42 -0500207 if (args->cbl_recall_type == RETURN_FSID)
208 stat = pnfs_destroy_layouts_byfsid(clp, &args->cbl_fsid, true);
209 else
210 stat = pnfs_destroy_layouts_byclid(clp, true);
211 if (stat != 0)
212 return NFS4ERR_DELAY;
213 return NFS4ERR_NOMATCHING_LAYOUT;
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000214}
215
216static u32 do_callback_layoutrecall(struct nfs_client *clp,
217 struct cb_layoutrecallargs *args)
218{
Trond Myklebust0cb32842012-03-01 11:17:50 -0500219 u32 res;
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000220
221 dprintk("%s enter, type=%i\n", __func__, args->cbl_recall_type);
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000222 if (args->cbl_recall_type == RETURN_FILE)
223 res = initiate_file_draining(clp, args);
224 else
225 res = initiate_bulk_draining(clp, args);
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000226 dprintk("%s returning %i\n", __func__, res);
227 return res;
228
229}
230
Fred Isamanf2a62562011-01-06 11:36:29 +0000231__be32 nfs4_callback_layoutrecall(struct cb_layoutrecallargs *args,
232 void *dummy, struct cb_process_state *cps)
233{
Fred Isaman43f1b3d2011-01-06 11:36:30 +0000234 u32 res;
235
236 dprintk("%s: -->\n", __func__);
237
238 if (cps->clp)
239 res = do_callback_layoutrecall(cps->clp, args);
240 else
241 res = NFS4ERR_OP_NOT_IN_SESSION;
242
243 dprintk("%s: exit with status = %d\n", __func__, res);
244 return cpu_to_be32(res);
Fred Isamanf2a62562011-01-06 11:36:29 +0000245}
246
Alexandros Batsakis36840372011-01-06 11:36:31 +0000247static void pnfs_recall_all_layouts(struct nfs_client *clp)
248{
249 struct cb_layoutrecallargs args;
250
251 /* Pretend we got a CB_LAYOUTRECALL(ALL) */
252 memset(&args, 0, sizeof(args));
253 args.cbl_recall_type = RETURN_ALL;
254 /* FIXME we ignore errors, what should we do? */
255 do_callback_layoutrecall(clp, &args);
256}
257
Marc Eshel1be56832011-05-22 19:47:09 +0300258__be32 nfs4_callback_devicenotify(struct cb_devicenotifyargs *args,
259 void *dummy, struct cb_process_state *cps)
260{
261 int i;
262 __be32 res = 0;
263 struct nfs_client *clp = cps->clp;
264 struct nfs_server *server = NULL;
265
266 dprintk("%s: -->\n", __func__);
267
268 if (!clp) {
269 res = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
270 goto out;
271 }
272
273 for (i = 0; i < args->ndevs; i++) {
274 struct cb_devicenotifyitem *dev = &args->devs[i];
275
276 if (!server ||
277 server->pnfs_curr_ld->id != dev->cbd_layout_type) {
278 rcu_read_lock();
279 list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
280 if (server->pnfs_curr_ld &&
281 server->pnfs_curr_ld->id == dev->cbd_layout_type) {
282 rcu_read_unlock();
283 goto found;
284 }
285 rcu_read_unlock();
286 dprintk("%s: layout type %u not found\n",
287 __func__, dev->cbd_layout_type);
288 continue;
289 }
290
291 found:
Benny Halevy35c8bb52011-05-24 18:04:02 +0300292 nfs4_delete_deviceid(server->pnfs_curr_ld, clp, &dev->cbd_dev_id);
Marc Eshel1be56832011-05-22 19:47:09 +0300293 }
294
295out:
296 kfree(args->devs);
297 dprintk("%s: exit with status = %u\n",
298 __func__, be32_to_cpu(res));
299 return res;
300}
301
Ricardo Labiaga963891a2009-04-01 09:23:34 -0400302/*
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400303 * Validate the sequenceID sent by the server.
304 * Return success if the sequenceID is one more than what we last saw on
305 * this slot, accounting for wraparound. Increments the slot's sequence.
306 *
Andy Adamson49110962010-01-14 17:45:08 -0500307 * We don't yet implement a duplicate request cache, instead we set the
308 * back channel ca_maxresponsesize_cached to zero. This is OK for now
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400309 * since we only currently implement idempotent callbacks anyway.
310 *
311 * We have a single slot backchannel at this time, so we don't bother
312 * checking the used_slots bit array on the table. The lower layer guarantees
313 * a single outstanding callback request at a time.
314 */
Andy Adamson9733f0d2010-01-22 12:03:08 -0500315static __be32
Andy Adamsonb2f28bd2010-01-14 17:45:07 -0500316validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400317{
318 struct nfs4_slot *slot;
319
Chuck Levere8d92382013-08-09 12:47:51 -0400320 dprintk("%s enter. slotid %u seqid %u\n",
Andy Adamsonb2f28bd2010-01-14 17:45:07 -0500321 __func__, args->csa_slotid, args->csa_sequenceid);
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400322
Andy Adamson61f2e512011-11-09 13:58:20 -0500323 if (args->csa_slotid >= NFS41_BC_MAX_CALLBACKS)
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400324 return htonl(NFS4ERR_BADSLOT);
325
Andy Adamsonb2f28bd2010-01-14 17:45:07 -0500326 slot = tbl->slots + args->csa_slotid;
Chuck Levere8d92382013-08-09 12:47:51 -0400327 dprintk("%s slot table seqid: %u\n", __func__, slot->seq_nr);
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400328
329 /* Normal */
Kinglong Meee937ee72015-06-02 18:58:46 +0800330 if (likely(args->csa_sequenceid == slot->seq_nr + 1))
Trond Myklebust55a67392011-08-02 14:46:29 -0400331 goto out_ok;
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400332
333 /* Replay */
Andy Adamsonb2f28bd2010-01-14 17:45:07 -0500334 if (args->csa_sequenceid == slot->seq_nr) {
Chuck Levere8d92382013-08-09 12:47:51 -0400335 dprintk("%s seqid %u is a replay\n",
Andy Adamsonb2f28bd2010-01-14 17:45:07 -0500336 __func__, args->csa_sequenceid);
Andy Adamson49110962010-01-14 17:45:08 -0500337 /* Signal process_op to set this error on next op */
338 if (args->csa_cachethis == 0)
339 return htonl(NFS4ERR_RETRY_UNCACHED_REP);
340
341 /* The ca_maxresponsesize_cached is 0 with no DRC */
342 else if (args->csa_cachethis == 1)
343 return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400344 }
345
346 /* Wraparound */
Andy Adamsonb2f28bd2010-01-14 17:45:07 -0500347 if (args->csa_sequenceid == 1 && (slot->seq_nr + 1) == 0) {
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400348 slot->seq_nr = 1;
Trond Myklebust55a67392011-08-02 14:46:29 -0400349 goto out_ok;
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400350 }
351
352 /* Misordered request */
353 return htonl(NFS4ERR_SEQ_MISORDERED);
Trond Myklebust55a67392011-08-02 14:46:29 -0400354out_ok:
355 tbl->highest_used_slotid = args->csa_slotid;
356 return htonl(NFS4_OK);
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400357}
358
359/*
Mike Sagera7989c32010-01-19 12:54:40 -0500360 * For each referring call triple, check the session's slot table for
361 * a match. If the slot is in use and the sequence numbers match, the
362 * client is still waiting for a response to the original request.
363 */
364static bool referring_call_exists(struct nfs_client *clp,
365 uint32_t nrclists,
366 struct referring_call_list *rclists)
367{
368 bool status = 0;
369 int i, j;
370 struct nfs4_session *session;
371 struct nfs4_slot_table *tbl;
372 struct referring_call_list *rclist;
373 struct referring_call *ref;
374
375 /*
376 * XXX When client trunking is implemented, this becomes
377 * a session lookup from within the loop
378 */
379 session = clp->cl_session;
380 tbl = &session->fc_slot_table;
381
382 for (i = 0; i < nrclists; i++) {
383 rclist = &rclists[i];
384 if (memcmp(session->sess_id.data,
385 rclist->rcl_sessionid.data,
386 NFS4_MAX_SESSIONID_LEN) != 0)
387 continue;
388
389 for (j = 0; j < rclist->rcl_nrefcalls; j++) {
390 ref = &rclist->rcl_refcalls[j];
391
392 dprintk("%s: sessionid %x:%x:%x:%x sequenceid %u "
393 "slotid %u\n", __func__,
394 ((u32 *)&rclist->rcl_sessionid.data)[0],
395 ((u32 *)&rclist->rcl_sessionid.data)[1],
396 ((u32 *)&rclist->rcl_sessionid.data)[2],
397 ((u32 *)&rclist->rcl_sessionid.data)[3],
398 ref->rc_sequenceid, ref->rc_slotid);
399
400 spin_lock(&tbl->slot_tbl_lock);
401 status = (test_bit(ref->rc_slotid, tbl->used_slots) &&
402 tbl->slots[ref->rc_slotid].seq_nr ==
403 ref->rc_sequenceid);
404 spin_unlock(&tbl->slot_tbl_lock);
405 if (status)
406 goto out;
407 }
408 }
409
410out:
411 return status;
412}
413
Andy Adamson9733f0d2010-01-22 12:03:08 -0500414__be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
Andy Adamsonc36fca52011-01-06 02:04:32 +0000415 struct cb_sequenceres *res,
416 struct cb_process_state *cps)
Benny Halevyd49433e2009-04-01 09:23:25 -0400417{
Trond Myklebust55a67392011-08-02 14:46:29 -0400418 struct nfs4_slot_table *tbl;
Kinglong Meee937ee72015-06-02 18:58:46 +0800419 struct nfs4_slot *slot;
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400420 struct nfs_client *clp;
Andy Adamson9733f0d2010-01-22 12:03:08 -0500421 int i;
Andy Adamson778be232011-01-25 15:38:01 +0000422 __be32 status = htonl(NFS4ERR_BADSESSION);
Benny Halevyd49433e2009-04-01 09:23:25 -0400423
Bryan Schumaker459de2e2013-06-05 11:15:01 -0400424 clp = nfs4_find_client_sessionid(cps->net, args->csa_addr,
425 &args->csa_sessionid, cps->minorversion);
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400426 if (clp == NULL)
427 goto out;
428
Trond Myklebustb1c0df52015-02-18 11:34:58 -0800429 if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
430 goto out;
Kinglong Meee937ee72015-06-02 18:58:46 +0800431
Trond Myklebust55a67392011-08-02 14:46:29 -0400432 tbl = &clp->cl_session->bc_slot_table;
Kinglong Meee937ee72015-06-02 18:58:46 +0800433 slot = tbl->slots + args->csa_slotid;
Trond Myklebust55a67392011-08-02 14:46:29 -0400434
435 spin_lock(&tbl->slot_tbl_lock);
Andy Adamson42acd022011-01-06 02:04:34 +0000436 /* state manager is resetting the session */
Andy Adamson774d5f12013-05-20 14:13:50 -0400437 if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
Trond Myklebust55a67392011-08-02 14:46:29 -0400438 status = htonl(NFS4ERR_DELAY);
Trond Myklebust910ac682011-08-02 14:46:52 -0400439 /* Return NFS4ERR_BADSESSION if we're draining the session
440 * in order to reset it.
441 */
442 if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
443 status = htonl(NFS4ERR_BADSESSION);
Trond Myklebust4e54ab82015-06-11 21:13:58 -0400444 goto out_unlock;
Andy Adamson42acd022011-01-06 02:04:34 +0000445 }
446
Kinglong Mee0579c8d2015-06-02 18:59:01 +0800447 memcpy(&res->csr_sessionid, &args->csa_sessionid,
448 sizeof(res->csr_sessionid));
449 res->csr_sequenceid = args->csa_sequenceid;
450 res->csr_slotid = args->csa_slotid;
451 res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
452 res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
453
Kinglong Meee937ee72015-06-02 18:58:46 +0800454 status = validate_seqid(tbl, args);
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400455 if (status)
Trond Myklebust4e54ab82015-06-11 21:13:58 -0400456 goto out_unlock;
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400457
Trond Myklebust55a67392011-08-02 14:46:29 -0400458 cps->slotid = args->csa_slotid;
459
Mike Sager72ce2b32010-01-19 12:54:41 -0500460 /*
461 * Check for pending referring calls. If a match is found, a
462 * related callback was received before the response to the original
463 * call.
464 */
465 if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
466 status = htonl(NFS4ERR_DELAY);
Trond Myklebust4e54ab82015-06-11 21:13:58 -0400467 goto out_unlock;
Mike Sager72ce2b32010-01-19 12:54:41 -0500468 }
469
Kinglong Meee937ee72015-06-02 18:58:46 +0800470 /*
471 * RFC5661 20.9.3
472 * If CB_SEQUENCE returns an error, then the state of the slot
473 * (sequence ID, cached reply) MUST NOT change.
474 */
475 slot->seq_nr++;
Trond Myklebust4e54ab82015-06-11 21:13:58 -0400476out_unlock:
477 spin_unlock(&tbl->slot_tbl_lock);
Kinglong Meee937ee72015-06-02 18:58:46 +0800478
Ricardo Labiaga68f3f902009-04-01 09:23:35 -0400479out:
Andy Adamson2c4cdf82011-01-25 15:38:02 +0000480 cps->clp = clp; /* put in nfs4_callback_compound */
Mike Sager72ce2b32010-01-19 12:54:41 -0500481 for (i = 0; i < args->csa_nrclists; i++)
482 kfree(args->csa_rclists[i].rcl_refcalls);
483 kfree(args->csa_rclists);
484
Andy Adamsonc36fca52011-01-06 02:04:32 +0000485 if (status == htonl(NFS4ERR_RETRY_UNCACHED_REP)) {
486 cps->drc_status = status;
487 status = 0;
488 } else
Andy Adamson49110962010-01-14 17:45:08 -0500489 res->csr_status = status;
Andy Adamsonc36fca52011-01-06 02:04:32 +0000490
Trond Myklebust2f92ae32013-08-14 17:58:28 -0400491 trace_nfs4_cb_sequence(args, res, status);
Andy Adamson49110962010-01-14 17:45:08 -0500492 dprintk("%s: exit with status = %d res->csr_status %d\n", __func__,
493 ntohl(status), ntohl(res->csr_status));
494 return status;
Benny Halevyd49433e2009-04-01 09:23:25 -0400495}
496
Alexandros Batsakis36840372011-01-06 11:36:31 +0000497static bool
498validate_bitmap_values(unsigned long mask)
499{
500 return (mask & ~RCA4_TYPE_MASK_ALL) == 0;
501}
502
Andy Adamsonc36fca52011-01-06 02:04:32 +0000503__be32 nfs4_callback_recallany(struct cb_recallanyargs *args, void *dummy,
504 struct cb_process_state *cps)
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500505{
Andy Adamson9733f0d2010-01-22 12:03:08 -0500506 __be32 status;
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500507 fmode_t flags = 0;
508
Alexandros Batsakis36840372011-01-06 11:36:31 +0000509 status = cpu_to_be32(NFS4ERR_OP_NOT_IN_SESSION);
Andy Adamsonc36fca52011-01-06 02:04:32 +0000510 if (!cps->clp) /* set in cb_sequence */
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500511 goto out;
512
Trond Myklebust2446ab62012-03-01 17:00:56 -0500513 dprintk_rcu("NFS: RECALL_ANY callback request from %s\n",
Andy Adamsonc36fca52011-01-06 02:04:32 +0000514 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR));
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500515
Alexandros Batsakis36840372011-01-06 11:36:31 +0000516 status = cpu_to_be32(NFS4ERR_INVAL);
517 if (!validate_bitmap_values(args->craa_type_mask))
518 goto out;
519
520 status = cpu_to_be32(NFS4_OK);
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500521 if (test_bit(RCA4_TYPE_MASK_RDATA_DLG, (const unsigned long *)
522 &args->craa_type_mask))
523 flags = FMODE_READ;
524 if (test_bit(RCA4_TYPE_MASK_WDATA_DLG, (const unsigned long *)
525 &args->craa_type_mask))
526 flags |= FMODE_WRITE;
Alexandros Batsakis36840372011-01-06 11:36:31 +0000527 if (test_bit(RCA4_TYPE_MASK_FILE_LAYOUT, (const unsigned long *)
528 &args->craa_type_mask))
529 pnfs_recall_all_layouts(cps->clp);
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500530 if (flags)
Trond Myklebust826e0012013-04-03 19:27:52 -0400531 nfs_expire_unused_delegation_types(cps->clp, flags);
Alexandros Batsakis31f09602009-12-05 13:27:02 -0500532out:
533 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
534 return status;
535}
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500536
537/* Reduce the fore channel's max_slots to the target value */
Andy Adamsonc36fca52011-01-06 02:04:32 +0000538__be32 nfs4_callback_recallslot(struct cb_recallslotargs *args, void *dummy,
539 struct cb_process_state *cps)
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500540{
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500541 struct nfs4_slot_table *fc_tbl;
Andy Adamson9733f0d2010-01-22 12:03:08 -0500542 __be32 status;
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500543
544 status = htonl(NFS4ERR_OP_NOT_IN_SESSION);
Andy Adamsonc36fca52011-01-06 02:04:32 +0000545 if (!cps->clp) /* set in cb_sequence */
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500546 goto out;
547
Chuck Levere8d92382013-08-09 12:47:51 -0400548 dprintk_rcu("NFS: CB_RECALL_SLOT request from %s target highest slotid %u\n",
Andy Adamsonc36fca52011-01-06 02:04:32 +0000549 rpc_peeraddr2str(cps->clp->cl_rpcclient, RPC_DISPLAY_ADDR),
Trond Myklebustd5fb4ce2012-11-20 20:24:02 -0500550 args->crsa_target_highest_slotid);
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500551
Andy Adamsonc36fca52011-01-06 02:04:32 +0000552 fc_tbl = &cps->clp->cl_session->fc_slot_table;
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500553
Andy Adamsonbae0ac02010-01-21 14:19:16 -0500554 status = htonl(NFS4_OK);
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500555
Trond Myklebustd5fb4ce2012-11-20 20:24:02 -0500556 nfs41_set_target_slotid(fc_tbl, args->crsa_target_highest_slotid);
Trond Myklebustac074832012-11-21 09:06:11 -0500557 nfs41_server_notify_target_slotid_update(cps->clp);
Andy Adamsonb9efa1b2010-01-20 16:06:27 -0500558out:
559 dprintk("%s: exit with status = %d\n", __func__, ntohl(status));
560 return status;
561}
Benny Halevyd49433e2009-04-01 09:23:25 -0400562#endif /* CONFIG_NFS_V4_1 */