Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/nfs/nfs4state.c |
| 3 | * |
| 4 | * Client-side XDR for NFSv4. |
| 5 | * |
| 6 | * Copyright (c) 2002 The Regents of the University of Michigan. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Kendrick Smith <kmsmith@umich.edu> |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * |
| 15 | * 1. Redistributions of source code must retain the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer. |
| 17 | * 2. Redistributions in binary form must reproduce the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer in the |
| 19 | * documentation and/or other materials provided with the distribution. |
| 20 | * 3. Neither the name of the University nor the names of its |
| 21 | * contributors may be used to endorse or promote products derived |
| 22 | * from this software without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 27 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 31 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 32 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 33 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 34 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 35 | * |
| 36 | * Implementation of the NFSv4 state model. For the time being, |
| 37 | * this is minimal, but will be made much more complex in a |
| 38 | * subsequent patch. |
| 39 | */ |
| 40 | |
Trond Myklebust | 6f43ddc | 2007-07-08 16:49:11 -0400 | [diff] [blame] | 41 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/slab.h> |
| 43 | #include <linux/smp_lock.h> |
| 44 | #include <linux/nfs_fs.h> |
| 45 | #include <linux/nfs_idmap.h> |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 46 | #include <linux/kthread.h> |
| 47 | #include <linux/module.h> |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 48 | #include <linux/random.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/workqueue.h> |
| 50 | #include <linux/bitops.h> |
| 51 | |
Trond Myklebust | 4ce7971 | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 52 | #include "nfs4_fs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include "callback.h" |
| 54 | #include "delegation.h" |
David Howells | 24c8dbb | 2006-08-22 20:06:10 -0400 | [diff] [blame] | 55 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | #define OPENOWNER_POOL_SIZE 8 |
| 58 | |
Trond Myklebust | 4ce7971 | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 59 | const nfs4_stateid zero_stateid; |
| 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | static LIST_HEAD(nfs4_clientid_list); |
| 62 | |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 63 | static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | { |
Chuck Lever | f738f51 | 2009-03-18 20:48:06 -0400 | [diff] [blame] | 65 | unsigned short port; |
| 66 | int status; |
| 67 | |
| 68 | port = nfs_callback_tcpport; |
| 69 | if (clp->cl_addr.ss_family == AF_INET6) |
| 70 | port = nfs_callback_tcpport6; |
| 71 | |
| 72 | status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | if (status == 0) |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 74 | status = nfs4_proc_setclientid_confirm(clp, cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | if (status == 0) |
| 76 | nfs4_schedule_state_renewal(clp); |
| 77 | return status; |
| 78 | } |
| 79 | |
Trond Myklebust | 6dc9d57 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 80 | static struct rpc_cred *nfs4_get_machine_cred_locked(struct nfs_client *clp) |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 81 | { |
| 82 | struct rpc_cred *cred = NULL; |
| 83 | |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 84 | if (clp->cl_machine_cred != NULL) |
| 85 | cred = get_rpccred(clp->cl_machine_cred); |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 86 | return cred; |
| 87 | } |
| 88 | |
| 89 | static void nfs4_clear_machine_cred(struct nfs_client *clp) |
| 90 | { |
| 91 | struct rpc_cred *cred; |
| 92 | |
| 93 | spin_lock(&clp->cl_lock); |
| 94 | cred = clp->cl_machine_cred; |
| 95 | clp->cl_machine_cred = NULL; |
| 96 | spin_unlock(&clp->cl_lock); |
| 97 | if (cred != NULL) |
| 98 | put_rpccred(cred); |
| 99 | } |
| 100 | |
Trond Myklebust | 6dc9d57 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 101 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) |
Trond Myklebust | b4454fe | 2006-01-03 09:55:25 +0100 | [diff] [blame] | 102 | { |
| 103 | struct nfs4_state_owner *sp; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 104 | struct rb_node *pos; |
Trond Myklebust | b4454fe | 2006-01-03 09:55:25 +0100 | [diff] [blame] | 105 | struct rpc_cred *cred = NULL; |
| 106 | |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 107 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
| 108 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
Trond Myklebust | b4454fe | 2006-01-03 09:55:25 +0100 | [diff] [blame] | 109 | if (list_empty(&sp->so_states)) |
| 110 | continue; |
| 111 | cred = get_rpccred(sp->so_cred); |
| 112 | break; |
| 113 | } |
| 114 | return cred; |
| 115 | } |
| 116 | |
Trond Myklebust | 6dc9d57 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 117 | static struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp) |
| 118 | { |
| 119 | struct rpc_cred *cred; |
| 120 | |
| 121 | spin_lock(&clp->cl_lock); |
| 122 | cred = nfs4_get_renew_cred_locked(clp); |
| 123 | spin_unlock(&clp->cl_lock); |
| 124 | return cred; |
| 125 | } |
| 126 | |
Trond Myklebust | 10afec9 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 127 | static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 128 | { |
| 129 | struct nfs4_state_owner *sp; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 130 | struct rb_node *pos; |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 131 | struct rpc_cred *cred; |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 132 | |
Trond Myklebust | 6dc9d57 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 133 | spin_lock(&clp->cl_lock); |
| 134 | cred = nfs4_get_machine_cred_locked(clp); |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 135 | if (cred != NULL) |
| 136 | goto out; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 137 | pos = rb_first(&clp->cl_state_owners); |
| 138 | if (pos != NULL) { |
| 139 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 140 | cred = get_rpccred(sp->so_cred); |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 141 | } |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 142 | out: |
Trond Myklebust | 6dc9d57 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 143 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 144 | return cred; |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 145 | } |
| 146 | |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 147 | static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new, |
| 148 | __u64 minval, int maxbits) |
| 149 | { |
| 150 | struct rb_node **p, *parent; |
| 151 | struct nfs_unique_id *pos; |
| 152 | __u64 mask = ~0ULL; |
| 153 | |
| 154 | if (maxbits < 64) |
| 155 | mask = (1ULL << maxbits) - 1ULL; |
| 156 | |
| 157 | /* Ensure distribution is more or less flat */ |
| 158 | get_random_bytes(&new->id, sizeof(new->id)); |
| 159 | new->id &= mask; |
| 160 | if (new->id < minval) |
| 161 | new->id += minval; |
| 162 | retry: |
| 163 | p = &root->rb_node; |
| 164 | parent = NULL; |
| 165 | |
| 166 | while (*p != NULL) { |
| 167 | parent = *p; |
| 168 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); |
| 169 | |
| 170 | if (new->id < pos->id) |
| 171 | p = &(*p)->rb_left; |
| 172 | else if (new->id > pos->id) |
| 173 | p = &(*p)->rb_right; |
| 174 | else |
| 175 | goto id_exists; |
| 176 | } |
| 177 | rb_link_node(&new->rb_node, parent, p); |
| 178 | rb_insert_color(&new->rb_node, root); |
| 179 | return; |
| 180 | id_exists: |
| 181 | for (;;) { |
| 182 | new->id++; |
| 183 | if (new->id < minval || (new->id & mask) != new->id) { |
| 184 | new->id = minval; |
| 185 | break; |
| 186 | } |
| 187 | parent = rb_next(parent); |
| 188 | if (parent == NULL) |
| 189 | break; |
| 190 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); |
| 191 | if (new->id < pos->id) |
| 192 | break; |
| 193 | } |
| 194 | goto retry; |
| 195 | } |
| 196 | |
| 197 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) |
| 198 | { |
| 199 | rb_erase(&id->rb_node, root); |
| 200 | } |
| 201 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | static struct nfs4_state_owner * |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 203 | nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | { |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 205 | struct nfs_client *clp = server->nfs_client; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 206 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
| 207 | *parent = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | struct nfs4_state_owner *sp, *res = NULL; |
| 209 | |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 210 | while (*p != NULL) { |
| 211 | parent = *p; |
| 212 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); |
| 213 | |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 214 | if (server < sp->so_server) { |
| 215 | p = &parent->rb_left; |
| 216 | continue; |
| 217 | } |
| 218 | if (server > sp->so_server) { |
| 219 | p = &parent->rb_right; |
| 220 | continue; |
| 221 | } |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 222 | if (cred < sp->so_cred) |
| 223 | p = &parent->rb_left; |
| 224 | else if (cred > sp->so_cred) |
| 225 | p = &parent->rb_right; |
| 226 | else { |
| 227 | atomic_inc(&sp->so_count); |
| 228 | res = sp; |
| 229 | break; |
| 230 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } |
| 232 | return res; |
| 233 | } |
| 234 | |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 235 | static struct nfs4_state_owner * |
| 236 | nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new) |
| 237 | { |
| 238 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
| 239 | *parent = NULL; |
| 240 | struct nfs4_state_owner *sp; |
| 241 | |
| 242 | while (*p != NULL) { |
| 243 | parent = *p; |
| 244 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); |
| 245 | |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 246 | if (new->so_server < sp->so_server) { |
| 247 | p = &parent->rb_left; |
| 248 | continue; |
| 249 | } |
| 250 | if (new->so_server > sp->so_server) { |
| 251 | p = &parent->rb_right; |
| 252 | continue; |
| 253 | } |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 254 | if (new->so_cred < sp->so_cred) |
| 255 | p = &parent->rb_left; |
| 256 | else if (new->so_cred > sp->so_cred) |
| 257 | p = &parent->rb_right; |
| 258 | else { |
| 259 | atomic_inc(&sp->so_count); |
| 260 | return sp; |
| 261 | } |
| 262 | } |
| 263 | nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64); |
| 264 | rb_link_node(&new->so_client_node, parent, p); |
| 265 | rb_insert_color(&new->so_client_node, &clp->cl_state_owners); |
| 266 | return new; |
| 267 | } |
| 268 | |
| 269 | static void |
| 270 | nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp) |
| 271 | { |
| 272 | if (!RB_EMPTY_NODE(&sp->so_client_node)) |
| 273 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); |
| 274 | nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id); |
| 275 | } |
| 276 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | /* |
| 278 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to |
| 279 | * create a new state_owner. |
| 280 | * |
| 281 | */ |
| 282 | static struct nfs4_state_owner * |
| 283 | nfs4_alloc_state_owner(void) |
| 284 | { |
| 285 | struct nfs4_state_owner *sp; |
| 286 | |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 287 | sp = kzalloc(sizeof(*sp),GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | if (!sp) |
| 289 | return NULL; |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 290 | spin_lock_init(&sp->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | INIT_LIST_HEAD(&sp->so_states); |
| 292 | INIT_LIST_HEAD(&sp->so_delegations); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 293 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
| 294 | sp->so_seqid.sequence = &sp->so_sequence; |
| 295 | spin_lock_init(&sp->so_sequence.lock); |
| 296 | INIT_LIST_HEAD(&sp->so_sequence.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | atomic_set(&sp->so_count, 1); |
| 298 | return sp; |
| 299 | } |
| 300 | |
Adrian Bunk | 1d2e88e | 2008-05-02 13:42:45 -0700 | [diff] [blame] | 301 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
| 303 | { |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 304 | if (!RB_EMPTY_NODE(&sp->so_client_node)) { |
| 305 | struct nfs_client *clp = sp->so_client; |
| 306 | |
| 307 | spin_lock(&clp->cl_lock); |
| 308 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); |
| 309 | RB_CLEAR_NODE(&sp->so_client_node); |
| 310 | spin_unlock(&clp->cl_lock); |
| 311 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | } |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
| 315 | { |
David Howells | 7539bba | 2006-08-22 20:06:09 -0400 | [diff] [blame] | 316 | struct nfs_client *clp = server->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | struct nfs4_state_owner *sp, *new; |
| 318 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | spin_lock(&clp->cl_lock); |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 320 | sp = nfs4_find_state_owner(server, cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | spin_unlock(&clp->cl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | if (sp != NULL) |
| 323 | return sp; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 324 | new = nfs4_alloc_state_owner(); |
| 325 | if (new == NULL) |
| 326 | return NULL; |
| 327 | new->so_client = clp; |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 328 | new->so_server = server; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 329 | new->so_cred = cred; |
| 330 | spin_lock(&clp->cl_lock); |
| 331 | sp = nfs4_insert_state_owner(clp, new); |
| 332 | spin_unlock(&clp->cl_lock); |
| 333 | if (sp == new) |
| 334 | get_rpccred(cred); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 335 | else { |
| 336 | rpc_destroy_wait_queue(&new->so_sequence.wait); |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 337 | kfree(new); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 338 | } |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 339 | return sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | } |
| 341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
| 343 | { |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 344 | struct nfs_client *clp = sp->so_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | struct rpc_cred *cred = sp->so_cred; |
| 346 | |
| 347 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) |
| 348 | return; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 349 | nfs4_remove_state_owner(clp, sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 351 | rpc_destroy_wait_queue(&sp->so_sequence.wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | put_rpccred(cred); |
| 353 | kfree(sp); |
| 354 | } |
| 355 | |
| 356 | static struct nfs4_state * |
| 357 | nfs4_alloc_open_state(void) |
| 358 | { |
| 359 | struct nfs4_state *state; |
| 360 | |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 361 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | if (!state) |
| 363 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | atomic_set(&state->count, 1); |
| 365 | INIT_LIST_HEAD(&state->lock_states); |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 366 | spin_lock_init(&state->state_lock); |
Trond Myklebust | 8bda4e4 | 2007-07-09 10:45:42 -0400 | [diff] [blame] | 367 | seqlock_init(&state->seqlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | return state; |
| 369 | } |
| 370 | |
Trond Myklebust | 4cecb76 | 2005-11-04 15:32:58 -0500 | [diff] [blame] | 371 | void |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 372 | nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
Trond Myklebust | 4cecb76 | 2005-11-04 15:32:58 -0500 | [diff] [blame] | 373 | { |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 374 | if (state->state == fmode) |
Trond Myklebust | 4cecb76 | 2005-11-04 15:32:58 -0500 | [diff] [blame] | 375 | return; |
| 376 | /* NB! List reordering - see the reclaim code for why. */ |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 377 | if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
| 378 | if (fmode & FMODE_WRITE) |
Trond Myklebust | 4cecb76 | 2005-11-04 15:32:58 -0500 | [diff] [blame] | 379 | list_move(&state->open_states, &state->owner->so_states); |
| 380 | else |
| 381 | list_move_tail(&state->open_states, &state->owner->so_states); |
| 382 | } |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 383 | state->state = fmode; |
Trond Myklebust | 4cecb76 | 2005-11-04 15:32:58 -0500 | [diff] [blame] | 384 | } |
| 385 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | static struct nfs4_state * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) |
| 388 | { |
| 389 | struct nfs_inode *nfsi = NFS_I(inode); |
| 390 | struct nfs4_state *state; |
| 391 | |
| 392 | list_for_each_entry(state, &nfsi->open_states, inode_states) { |
Trond Myklebust | 1c816ef | 2007-07-03 14:41:19 -0400 | [diff] [blame] | 393 | if (state->owner != owner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | continue; |
Trond Myklebust | 1c816ef | 2007-07-03 14:41:19 -0400 | [diff] [blame] | 395 | if (atomic_inc_not_zero(&state->count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | return state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | } |
| 398 | return NULL; |
| 399 | } |
| 400 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | static void |
| 402 | nfs4_free_open_state(struct nfs4_state *state) |
| 403 | { |
| 404 | kfree(state); |
| 405 | } |
| 406 | |
| 407 | struct nfs4_state * |
| 408 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) |
| 409 | { |
| 410 | struct nfs4_state *state, *new; |
| 411 | struct nfs_inode *nfsi = NFS_I(inode); |
| 412 | |
| 413 | spin_lock(&inode->i_lock); |
| 414 | state = __nfs4_find_state_byowner(inode, owner); |
| 415 | spin_unlock(&inode->i_lock); |
| 416 | if (state) |
| 417 | goto out; |
| 418 | new = nfs4_alloc_open_state(); |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 419 | spin_lock(&owner->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | spin_lock(&inode->i_lock); |
| 421 | state = __nfs4_find_state_byowner(inode, owner); |
| 422 | if (state == NULL && new != NULL) { |
| 423 | state = new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | state->owner = owner; |
| 425 | atomic_inc(&owner->so_count); |
| 426 | list_add(&state->inode_states, &nfsi->open_states); |
| 427 | state->inode = igrab(inode); |
| 428 | spin_unlock(&inode->i_lock); |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 429 | /* Note: The reclaim code dictates that we add stateless |
| 430 | * and read-only stateids to the end of the list */ |
| 431 | list_add_tail(&state->open_states, &owner->so_states); |
| 432 | spin_unlock(&owner->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | } else { |
| 434 | spin_unlock(&inode->i_lock); |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 435 | spin_unlock(&owner->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | if (new) |
| 437 | nfs4_free_open_state(new); |
| 438 | } |
| 439 | out: |
| 440 | return state; |
| 441 | } |
| 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | void nfs4_put_open_state(struct nfs4_state *state) |
| 444 | { |
| 445 | struct inode *inode = state->inode; |
| 446 | struct nfs4_state_owner *owner = state->owner; |
| 447 | |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 448 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | return; |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 450 | spin_lock(&inode->i_lock); |
Trond Myklebust | ba68303 | 2007-07-27 10:23:05 -0400 | [diff] [blame] | 451 | list_del(&state->inode_states); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | list_del(&state->open_states); |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 453 | spin_unlock(&inode->i_lock); |
| 454 | spin_unlock(&owner->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | iput(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | nfs4_free_open_state(state); |
| 457 | nfs4_put_state_owner(owner); |
| 458 | } |
| 459 | |
| 460 | /* |
Trond Myklebust | 83c9d41 | 2005-10-18 14:20:13 -0700 | [diff] [blame] | 461 | * Close the current file. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | */ |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 463 | static void __nfs4_close(struct path *path, struct nfs4_state *state, fmode_t fmode, int wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | struct nfs4_state_owner *owner = state->owner; |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 466 | int call_close = 0; |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 467 | fmode_t newstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
| 469 | atomic_inc(&owner->so_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | /* Protect against nfs4_find_state() */ |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 471 | spin_lock(&owner->so_lock); |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 472 | switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 473 | case FMODE_READ: |
| 474 | state->n_rdonly--; |
| 475 | break; |
| 476 | case FMODE_WRITE: |
| 477 | state->n_wronly--; |
| 478 | break; |
| 479 | case FMODE_READ|FMODE_WRITE: |
| 480 | state->n_rdwr--; |
| 481 | } |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 482 | newstate = FMODE_READ|FMODE_WRITE; |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 483 | if (state->n_rdwr == 0) { |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 484 | if (state->n_rdonly == 0) { |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 485 | newstate &= ~FMODE_READ; |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 486 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
| 487 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); |
| 488 | } |
| 489 | if (state->n_wronly == 0) { |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 490 | newstate &= ~FMODE_WRITE; |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 491 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
| 492 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); |
| 493 | } |
| 494 | if (newstate == 0) |
| 495 | clear_bit(NFS_DELEGATED_STATE, &state->flags); |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 496 | } |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 497 | nfs4_state_set_mode_locked(state, newstate); |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 498 | spin_unlock(&owner->so_lock); |
Trond Myklebust | 4cecb76 | 2005-11-04 15:32:58 -0500 | [diff] [blame] | 499 | |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 500 | if (!call_close) { |
Trond Myklebust | b39e625 | 2007-06-11 23:05:07 -0400 | [diff] [blame] | 501 | nfs4_put_open_state(state); |
| 502 | nfs4_put_state_owner(owner); |
| 503 | } else |
Trond Myklebust | a49c3c7 | 2007-10-18 18:03:27 -0400 | [diff] [blame] | 504 | nfs4_do_close(path, state, wait); |
| 505 | } |
| 506 | |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 507 | void nfs4_close_state(struct path *path, struct nfs4_state *state, fmode_t fmode) |
Trond Myklebust | a49c3c7 | 2007-10-18 18:03:27 -0400 | [diff] [blame] | 508 | { |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 509 | __nfs4_close(path, state, fmode, 0); |
Trond Myklebust | a49c3c7 | 2007-10-18 18:03:27 -0400 | [diff] [blame] | 510 | } |
| 511 | |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 512 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, fmode_t fmode) |
Trond Myklebust | a49c3c7 | 2007-10-18 18:03:27 -0400 | [diff] [blame] | 513 | { |
Trond Myklebust | dc0b027 | 2008-12-23 15:21:56 -0500 | [diff] [blame] | 514 | __nfs4_close(path, state, fmode, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | /* |
| 518 | * Search the state->lock_states for an existing lock_owner |
| 519 | * that is compatible with current->files |
| 520 | */ |
| 521 | static struct nfs4_lock_state * |
| 522 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) |
| 523 | { |
| 524 | struct nfs4_lock_state *pos; |
| 525 | list_for_each_entry(pos, &state->lock_states, ls_locks) { |
| 526 | if (pos->ls_owner != fl_owner) |
| 527 | continue; |
| 528 | atomic_inc(&pos->ls_count); |
| 529 | return pos; |
| 530 | } |
| 531 | return NULL; |
| 532 | } |
| 533 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | /* |
| 535 | * Return a compatible lock_state. If no initialized lock_state structure |
| 536 | * exists, return an uninitialized one. |
| 537 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | */ |
| 539 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) |
| 540 | { |
| 541 | struct nfs4_lock_state *lsp; |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 542 | struct nfs_client *clp = state->owner->so_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 544 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | if (lsp == NULL) |
| 546 | return NULL; |
Trond Myklebust | d0dc370 | 2008-01-10 16:07:54 -0500 | [diff] [blame] | 547 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
| 548 | spin_lock_init(&lsp->ls_sequence.lock); |
| 549 | INIT_LIST_HEAD(&lsp->ls_sequence.list); |
| 550 | lsp->ls_seqid.sequence = &lsp->ls_sequence; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | atomic_set(&lsp->ls_count, 1); |
| 552 | lsp->ls_owner = fl_owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | spin_lock(&clp->cl_lock); |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 554 | nfs_alloc_unique_id(&clp->cl_lockowner_id, &lsp->ls_id, 1, 64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 556 | INIT_LIST_HEAD(&lsp->ls_locks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | return lsp; |
| 558 | } |
| 559 | |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 560 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
| 561 | { |
| 562 | struct nfs_client *clp = lsp->ls_state->owner->so_client; |
| 563 | |
| 564 | spin_lock(&clp->cl_lock); |
| 565 | nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id); |
| 566 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 567 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 568 | kfree(lsp); |
| 569 | } |
| 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | /* |
| 572 | * Return a compatible lock_state. If no initialized lock_state structure |
| 573 | * exists, return an uninitialized one. |
| 574 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | */ |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 576 | static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | { |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 578 | struct nfs4_lock_state *lsp, *new = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 580 | for(;;) { |
| 581 | spin_lock(&state->state_lock); |
| 582 | lsp = __nfs4_find_lock_state(state, owner); |
| 583 | if (lsp != NULL) |
| 584 | break; |
| 585 | if (new != NULL) { |
| 586 | new->ls_state = state; |
| 587 | list_add(&new->ls_locks, &state->lock_states); |
| 588 | set_bit(LK_STATE_IN_USE, &state->flags); |
| 589 | lsp = new; |
| 590 | new = NULL; |
| 591 | break; |
| 592 | } |
| 593 | spin_unlock(&state->state_lock); |
| 594 | new = nfs4_alloc_lock_state(state, owner); |
| 595 | if (new == NULL) |
| 596 | return NULL; |
| 597 | } |
| 598 | spin_unlock(&state->state_lock); |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 599 | if (new != NULL) |
| 600 | nfs4_free_lock_state(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | return lsp; |
| 602 | } |
| 603 | |
| 604 | /* |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 605 | * Release reference to lock_state, and free it if we see that |
| 606 | * it is no longer in use |
| 607 | */ |
Trond Myklebust | faf5f49 | 2005-10-18 14:20:15 -0700 | [diff] [blame] | 608 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 609 | { |
| 610 | struct nfs4_state *state; |
| 611 | |
| 612 | if (lsp == NULL) |
| 613 | return; |
| 614 | state = lsp->ls_state; |
| 615 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) |
| 616 | return; |
| 617 | list_del(&lsp->ls_locks); |
| 618 | if (list_empty(&state->lock_states)) |
| 619 | clear_bit(LK_STATE_IN_USE, &state->flags); |
| 620 | spin_unlock(&state->state_lock); |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 621 | nfs4_free_lock_state(lsp); |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
| 625 | { |
| 626 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
| 627 | |
| 628 | dst->fl_u.nfs4_fl.owner = lsp; |
| 629 | atomic_inc(&lsp->ls_count); |
| 630 | } |
| 631 | |
| 632 | static void nfs4_fl_release_lock(struct file_lock *fl) |
| 633 | { |
| 634 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
| 635 | } |
| 636 | |
| 637 | static struct file_lock_operations nfs4_fl_lock_ops = { |
| 638 | .fl_copy_lock = nfs4_fl_copy_lock, |
| 639 | .fl_release_private = nfs4_fl_release_lock, |
| 640 | }; |
| 641 | |
| 642 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) |
| 643 | { |
| 644 | struct nfs4_lock_state *lsp; |
| 645 | |
| 646 | if (fl->fl_ops != NULL) |
| 647 | return 0; |
| 648 | lsp = nfs4_get_lock_state(state, fl->fl_owner); |
| 649 | if (lsp == NULL) |
| 650 | return -ENOMEM; |
| 651 | fl->fl_u.nfs4_fl.owner = lsp; |
| 652 | fl->fl_ops = &nfs4_fl_lock_ops; |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | * Byte-range lock aware utility to initialize the stateid of read/write |
| 658 | * requests. |
| 659 | */ |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 660 | void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t fl_owner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | { |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 662 | struct nfs4_lock_state *lsp; |
Trond Myklebust | 8bda4e4 | 2007-07-09 10:45:42 -0400 | [diff] [blame] | 663 | int seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
Trond Myklebust | 8bda4e4 | 2007-07-09 10:45:42 -0400 | [diff] [blame] | 665 | do { |
| 666 | seq = read_seqbegin(&state->seqlock); |
| 667 | memcpy(dst, &state->stateid, sizeof(*dst)); |
| 668 | } while (read_seqretry(&state->seqlock, seq)); |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 669 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
| 670 | return; |
| 671 | |
| 672 | spin_lock(&state->state_lock); |
| 673 | lsp = __nfs4_find_lock_state(state, fl_owner); |
| 674 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) |
| 675 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); |
| 676 | spin_unlock(&state->state_lock); |
| 677 | nfs4_put_lock_state(lsp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
| 679 | |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 680 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | { |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 682 | struct nfs_seqid *new; |
| 683 | |
| 684 | new = kmalloc(sizeof(*new), GFP_KERNEL); |
| 685 | if (new != NULL) { |
| 686 | new->sequence = counter; |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 687 | INIT_LIST_HEAD(&new->list); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 688 | } |
| 689 | return new; |
| 690 | } |
| 691 | |
| 692 | void nfs_free_seqid(struct nfs_seqid *seqid) |
| 693 | { |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 694 | if (!list_empty(&seqid->list)) { |
| 695 | struct rpc_sequence *sequence = seqid->sequence->sequence; |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 696 | |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 697 | spin_lock(&sequence->lock); |
| 698 | list_del(&seqid->list); |
| 699 | spin_unlock(&sequence->lock); |
| 700 | rpc_wake_up(&sequence->wait); |
| 701 | } |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 702 | kfree(seqid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | } |
| 704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | /* |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 706 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
| 707 | * failed with a seqid incrementing error - |
| 708 | * see comments nfs_fs.h:seqid_mutating_error() |
| 709 | */ |
Trond Myklebust | 88d9093 | 2007-07-02 14:03:03 -0400 | [diff] [blame] | 710 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | { |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 712 | BUG_ON(list_first_entry(&seqid->sequence->sequence->list, struct nfs_seqid, list) != seqid); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 713 | switch (status) { |
| 714 | case 0: |
| 715 | break; |
| 716 | case -NFS4ERR_BAD_SEQID: |
Trond Myklebust | 6f43ddc | 2007-07-08 16:49:11 -0400 | [diff] [blame] | 717 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
| 718 | return; |
| 719 | printk(KERN_WARNING "NFS: v4 server returned a bad" |
Dan Muntz | 497799e | 2008-02-13 13:09:35 -0800 | [diff] [blame] | 720 | " sequence-id error on an" |
| 721 | " unconfirmed sequence %p!\n", |
Trond Myklebust | 6f43ddc | 2007-07-08 16:49:11 -0400 | [diff] [blame] | 722 | seqid->sequence); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 723 | case -NFS4ERR_STALE_CLIENTID: |
| 724 | case -NFS4ERR_STALE_STATEID: |
| 725 | case -NFS4ERR_BAD_STATEID: |
| 726 | case -NFS4ERR_BADXDR: |
| 727 | case -NFS4ERR_RESOURCE: |
| 728 | case -NFS4ERR_NOFILEHANDLE: |
| 729 | /* Non-seqid mutating errors */ |
| 730 | return; |
| 731 | }; |
| 732 | /* |
| 733 | * Note: no locking needed as we are guaranteed to be first |
| 734 | * on the sequence list |
| 735 | */ |
| 736 | seqid->sequence->counter++; |
| 737 | } |
| 738 | |
| 739 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) |
| 740 | { |
| 741 | if (status == -NFS4ERR_BAD_SEQID) { |
| 742 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
| 743 | struct nfs4_state_owner, so_seqid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | nfs4_drop_state_owner(sp); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 745 | } |
Trond Myklebust | 88d9093 | 2007-07-02 14:03:03 -0400 | [diff] [blame] | 746 | nfs_increment_seqid(status, seqid); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 747 | } |
| 748 | |
| 749 | /* |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 750 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
| 751 | * failed with a seqid incrementing error - |
| 752 | * see comments nfs_fs.h:seqid_mutating_error() |
| 753 | */ |
| 754 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) |
| 755 | { |
Trond Myklebust | 88d9093 | 2007-07-02 14:03:03 -0400 | [diff] [blame] | 756 | nfs_increment_seqid(status, seqid); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 757 | } |
| 758 | |
| 759 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) |
| 760 | { |
| 761 | struct rpc_sequence *sequence = seqid->sequence->sequence; |
| 762 | int status = 0; |
| 763 | |
| 764 | spin_lock(&sequence->lock); |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 765 | if (list_empty(&seqid->list)) |
| 766 | list_add_tail(&seqid->list, &sequence->list); |
| 767 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) |
| 768 | goto unlock; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 769 | rpc_sleep_on(&sequence->wait, task, NULL); |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 770 | status = -EAGAIN; |
| 771 | unlock: |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 772 | spin_unlock(&sequence->lock); |
| 773 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | } |
| 775 | |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 776 | static int nfs4_run_state_manager(void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 778 | static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
Trond Myklebust | 433fbe4 | 2006-01-03 09:55:22 +0100 | [diff] [blame] | 779 | { |
| 780 | smp_mb__before_clear_bit(); |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 781 | clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
Trond Myklebust | 433fbe4 | 2006-01-03 09:55:22 +0100 | [diff] [blame] | 782 | smp_mb__after_clear_bit(); |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 783 | wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
Trond Myklebust | 433fbe4 | 2006-01-03 09:55:22 +0100 | [diff] [blame] | 784 | rpc_wake_up(&clp->cl_rpcwaitq); |
| 785 | } |
| 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | /* |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 788 | * Schedule the nfs_client asynchronous state management routine |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | */ |
Trond Myklebust | b0d3ded | 2008-12-23 15:21:50 -0500 | [diff] [blame] | 790 | void nfs4_schedule_state_manager(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | { |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 792 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 794 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
| 795 | return; |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 796 | __module_get(THIS_MODULE); |
| 797 | atomic_inc(&clp->cl_count); |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 798 | task = kthread_run(nfs4_run_state_manager, clp, "%s-manager", |
Chuck Lever | 5d8515c | 2007-12-10 14:57:16 -0500 | [diff] [blame] | 799 | rpc_peeraddr2str(clp->cl_rpcclient, |
| 800 | RPC_DISPLAY_ADDR)); |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 801 | if (!IS_ERR(task)) |
| 802 | return; |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 803 | nfs4_clear_state_manager_bit(clp); |
David Howells | 24c8dbb | 2006-08-22 20:06:10 -0400 | [diff] [blame] | 804 | nfs_put_client(clp); |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 805 | module_put(THIS_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | /* |
| 809 | * Schedule a state recovery attempt |
| 810 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 811 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | { |
| 813 | if (!clp) |
| 814 | return; |
Trond Myklebust | e598d84 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 815 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
| 816 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 817 | nfs4_schedule_state_manager(clp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | } |
| 819 | |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 820 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
| 821 | { |
| 822 | |
| 823 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
| 824 | /* Don't recover state that expired before the reboot */ |
| 825 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { |
| 826 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
| 827 | return 0; |
| 828 | } |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 829 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 830 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
| 831 | return 1; |
| 832 | } |
| 833 | |
Trond Myklebust | 9e33bed | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 834 | int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 835 | { |
| 836 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); |
| 837 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 838 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 839 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
| 840 | return 1; |
| 841 | } |
| 842 | |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 843 | static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | { |
| 845 | struct inode *inode = state->inode; |
Trond Myklebust | 19e03c5 | 2008-12-23 15:21:44 -0500 | [diff] [blame] | 846 | struct nfs_inode *nfsi = NFS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | struct file_lock *fl; |
| 848 | int status = 0; |
| 849 | |
Trond Myklebust | 19e03c5 | 2008-12-23 15:21:44 -0500 | [diff] [blame] | 850 | down_write(&nfsi->rwsem); |
Harvey Harrison | 90dc7d2 | 2008-02-20 13:03:05 -0800 | [diff] [blame] | 851 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
Trond Myklebust | 43b2a33 | 2005-11-04 15:35:30 -0500 | [diff] [blame] | 852 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | continue; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 854 | if (nfs_file_open_context(fl->fl_file)->state != state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | continue; |
| 856 | status = ops->recover_lock(state, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | switch (status) { |
Trond Myklebust | 965b5d6 | 2009-06-17 13:22:59 -0700 | [diff] [blame^] | 858 | case 0: |
| 859 | break; |
| 860 | case -ESTALE: |
| 861 | case -NFS4ERR_ADMIN_REVOKED: |
| 862 | case -NFS4ERR_STALE_STATEID: |
| 863 | case -NFS4ERR_BAD_STATEID: |
| 864 | case -NFS4ERR_EXPIRED: |
| 865 | case -NFS4ERR_NO_GRACE: |
| 866 | case -NFS4ERR_STALE_CLIENTID: |
| 867 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | default: |
| 869 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 870 | __func__, status); |
Trond Myklebust | 965b5d6 | 2009-06-17 13:22:59 -0700 | [diff] [blame^] | 871 | case -ENOMEM: |
| 872 | case -NFS4ERR_DENIED: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | case -NFS4ERR_RECLAIM_BAD: |
| 874 | case -NFS4ERR_RECLAIM_CONFLICT: |
Trond Myklebust | 43b2a33 | 2005-11-04 15:35:30 -0500 | [diff] [blame] | 875 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
Trond Myklebust | 965b5d6 | 2009-06-17 13:22:59 -0700 | [diff] [blame^] | 876 | status = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | } |
| 878 | } |
Trond Myklebust | 965b5d6 | 2009-06-17 13:22:59 -0700 | [diff] [blame^] | 879 | out: |
Trond Myklebust | 19e03c5 | 2008-12-23 15:21:44 -0500 | [diff] [blame] | 880 | up_write(&nfsi->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | return status; |
| 882 | } |
| 883 | |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 884 | static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | { |
| 886 | struct nfs4_state *state; |
| 887 | struct nfs4_lock_state *lock; |
| 888 | int status = 0; |
| 889 | |
| 890 | /* Note: we rely on the sp->so_states list being ordered |
| 891 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) |
| 892 | * states first. |
| 893 | * This is needed to ensure that the server won't give us any |
| 894 | * read delegations that we have to return if, say, we are |
| 895 | * recovering after a network partition or a reboot from a |
| 896 | * server that doesn't support a grace period. |
| 897 | */ |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 898 | restart: |
| 899 | spin_lock(&sp->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | list_for_each_entry(state, &sp->so_states, open_states) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 901 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
| 902 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | if (state->state == 0) |
| 904 | continue; |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 905 | atomic_inc(&state->count); |
| 906 | spin_unlock(&sp->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | status = ops->recover_open(sp, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | if (status >= 0) { |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 909 | status = nfs4_reclaim_locks(state, ops); |
| 910 | if (status >= 0) { |
| 911 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
| 912 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) |
| 913 | printk("%s: Lock reclaim failed!\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 914 | __func__); |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 915 | } |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 916 | nfs4_put_open_state(state); |
| 917 | goto restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | } |
| 920 | switch (status) { |
| 921 | default: |
| 922 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 923 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | case -ENOENT: |
Trond Myklebust | 965b5d6 | 2009-06-17 13:22:59 -0700 | [diff] [blame^] | 925 | case -ENOMEM: |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 926 | case -ESTALE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | /* |
| 928 | * Open state on this file cannot be recovered |
| 929 | * All we can do is revert to using the zero stateid. |
| 930 | */ |
| 931 | memset(state->stateid.data, 0, |
| 932 | sizeof(state->stateid.data)); |
| 933 | /* Mark the file as being 'closed' */ |
| 934 | state->state = 0; |
| 935 | break; |
Trond Myklebust | 965b5d6 | 2009-06-17 13:22:59 -0700 | [diff] [blame^] | 936 | case -NFS4ERR_ADMIN_REVOKED: |
| 937 | case -NFS4ERR_STALE_STATEID: |
| 938 | case -NFS4ERR_BAD_STATEID: |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 939 | case -NFS4ERR_RECLAIM_BAD: |
| 940 | case -NFS4ERR_RECLAIM_CONFLICT: |
| 941 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); |
| 942 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | case -NFS4ERR_EXPIRED: |
| 944 | case -NFS4ERR_NO_GRACE: |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 945 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | case -NFS4ERR_STALE_CLIENTID: |
| 947 | goto out_err; |
| 948 | } |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 949 | nfs4_put_open_state(state); |
| 950 | goto restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | } |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 952 | spin_unlock(&sp->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | return 0; |
| 954 | out_err: |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 955 | nfs4_put_open_state(state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | return status; |
| 957 | } |
| 958 | |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 959 | static void nfs4_clear_open_state(struct nfs4_state *state) |
| 960 | { |
| 961 | struct nfs4_lock_state *lock; |
| 962 | |
| 963 | clear_bit(NFS_DELEGATED_STATE, &state->flags); |
| 964 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); |
| 965 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); |
| 966 | clear_bit(NFS_O_RDWR_STATE, &state->flags); |
| 967 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 968 | lock->ls_seqid.flags = 0; |
| 969 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; |
| 970 | } |
| 971 | } |
| 972 | |
| 973 | static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 974 | { |
| 975 | struct nfs4_state_owner *sp; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 976 | struct rb_node *pos; |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 977 | struct nfs4_state *state; |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 978 | |
| 979 | /* Reset all sequence ids to zero */ |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 980 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
| 981 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 982 | sp->so_seqid.flags = 0; |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 983 | spin_lock(&sp->so_lock); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 984 | list_for_each_entry(state, &sp->so_states, open_states) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 985 | if (mark_reclaim(clp, state)) |
| 986 | nfs4_clear_open_state(state); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 987 | } |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 988 | spin_unlock(&sp->so_lock); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 989 | } |
| 990 | } |
| 991 | |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 992 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
| 993 | { |
| 994 | /* Mark all delegations for reclaim */ |
| 995 | nfs_delegation_mark_reclaim(clp); |
| 996 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); |
| 997 | } |
| 998 | |
| 999 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) |
| 1000 | { |
| 1001 | struct nfs4_state_owner *sp; |
| 1002 | struct rb_node *pos; |
| 1003 | struct nfs4_state *state; |
| 1004 | |
| 1005 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
| 1006 | return; |
| 1007 | |
| 1008 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
| 1009 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
| 1010 | spin_lock(&sp->so_lock); |
| 1011 | list_for_each_entry(state, &sp->so_states, open_states) { |
| 1012 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags)) |
| 1013 | continue; |
| 1014 | nfs4_state_mark_reclaim_nograce(clp, state); |
| 1015 | } |
| 1016 | spin_unlock(&sp->so_lock); |
| 1017 | } |
| 1018 | |
| 1019 | nfs_delegation_reap_unclaimed(clp); |
| 1020 | } |
| 1021 | |
| 1022 | static void nfs_delegation_clear_all(struct nfs_client *clp) |
| 1023 | { |
| 1024 | nfs_delegation_mark_reclaim(clp); |
| 1025 | nfs_delegation_reap_unclaimed(clp); |
| 1026 | } |
| 1027 | |
| 1028 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) |
| 1029 | { |
| 1030 | nfs_delegation_clear_all(clp); |
| 1031 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); |
| 1032 | } |
| 1033 | |
| 1034 | static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp) |
| 1035 | { |
| 1036 | clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
| 1037 | } |
| 1038 | |
Trond Myklebust | e598d84 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1039 | static void nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
| 1040 | { |
| 1041 | switch (error) { |
| 1042 | case -NFS4ERR_CB_PATH_DOWN: |
Trond Myklebust | 707fb4b | 2008-12-23 15:21:47 -0500 | [diff] [blame] | 1043 | nfs_handle_cb_pathdown(clp); |
Trond Myklebust | e598d84 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1044 | break; |
| 1045 | case -NFS4ERR_STALE_CLIENTID: |
| 1046 | case -NFS4ERR_LEASE_MOVED: |
| 1047 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
| 1048 | nfs4_state_start_reclaim_reboot(clp); |
| 1049 | break; |
| 1050 | case -NFS4ERR_EXPIRED: |
| 1051 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
| 1052 | nfs4_state_start_reclaim_nograce(clp); |
| 1053 | } |
| 1054 | } |
| 1055 | |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1056 | static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | { |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 1058 | struct rb_node *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | int status = 0; |
| 1060 | |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 1061 | restart: |
| 1062 | spin_lock(&clp->cl_lock); |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1063 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
| 1064 | struct nfs4_state_owner *sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 1065 | if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags)) |
| 1066 | continue; |
| 1067 | atomic_inc(&sp->so_count); |
| 1068 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1069 | status = nfs4_reclaim_open_state(sp, ops); |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 1070 | if (status < 0) { |
| 1071 | set_bit(ops->owner_flag_bit, &sp->so_flags); |
| 1072 | nfs4_put_state_owner(sp); |
| 1073 | nfs4_recovery_handle_error(clp, status); |
| 1074 | return status; |
| 1075 | } |
| 1076 | nfs4_put_state_owner(sp); |
| 1077 | goto restart; |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1078 | } |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 1079 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1080 | return status; |
| 1081 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1083 | static int nfs4_check_lease(struct nfs_client *clp) |
| 1084 | { |
| 1085 | struct rpc_cred *cred; |
| 1086 | int status = -NFS4ERR_EXPIRED; |
| 1087 | |
Trond Myklebust | 0f605b5 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1088 | /* Is the client already known to have an expired lease? */ |
| 1089 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
| 1090 | return 0; |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 1091 | cred = nfs4_get_renew_cred(clp); |
Trond Myklebust | 0f605b5 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1092 | if (cred == NULL) { |
| 1093 | cred = nfs4_get_setclientid_cred(clp); |
| 1094 | if (cred == NULL) |
| 1095 | goto out; |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1096 | } |
Trond Myklebust | 0f605b5 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1097 | status = nfs4_proc_renew(clp, cred); |
| 1098 | put_rpccred(cred); |
| 1099 | out: |
| 1100 | nfs4_recovery_handle_error(clp, status); |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1101 | return status; |
| 1102 | } |
| 1103 | |
| 1104 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
| 1105 | { |
| 1106 | struct rpc_cred *cred; |
| 1107 | int status = -ENOENT; |
| 1108 | |
| 1109 | cred = nfs4_get_setclientid_cred(clp); |
| 1110 | if (cred != NULL) { |
| 1111 | status = nfs4_init_client(clp, cred); |
| 1112 | put_rpccred(cred); |
| 1113 | /* Handle case where the user hasn't set up machine creds */ |
| 1114 | if (status == -EACCES && cred == clp->cl_machine_cred) { |
| 1115 | nfs4_clear_machine_cred(clp); |
| 1116 | status = -EAGAIN; |
| 1117 | } |
| 1118 | } |
| 1119 | return status; |
| 1120 | } |
| 1121 | |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 1122 | static void nfs4_state_manager(struct nfs_client *clp) |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1123 | { |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1124 | int status = 0; |
| 1125 | |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1126 | /* Ensure exclusive access to NFSv4 state */ |
Trond Myklebust | f3c7649 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 1127 | for(;;) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1128 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
| 1129 | /* We're going to have to re-establish a clientid */ |
| 1130 | status = nfs4_reclaim_lease(clp); |
| 1131 | if (status) { |
| 1132 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
| 1133 | if (status == -EAGAIN) |
| 1134 | continue; |
| 1135 | goto out_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | } |
Trond Myklebust | e598d84 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1137 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
| 1138 | } |
| 1139 | |
| 1140 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
| 1141 | status = nfs4_check_lease(clp); |
| 1142 | if (status != 0) |
| 1143 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | } |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1145 | |
| 1146 | /* First recover reboot state... */ |
| 1147 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1148 | status = nfs4_do_reclaim(clp, &nfs4_reboot_recovery_ops); |
Trond Myklebust | e598d84 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1149 | if (status == -NFS4ERR_STALE_CLIENTID) |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1150 | continue; |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1151 | nfs4_state_end_reclaim_reboot(clp); |
| 1152 | continue; |
| 1153 | } |
| 1154 | |
| 1155 | /* Now recover expired state... */ |
| 1156 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1157 | status = nfs4_do_reclaim(clp, &nfs4_nograce_recovery_ops); |
| 1158 | if (status < 0) { |
| 1159 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
| 1160 | if (status == -NFS4ERR_STALE_CLIENTID) |
| 1161 | continue; |
| 1162 | if (status == -NFS4ERR_EXPIRED) |
| 1163 | continue; |
| 1164 | goto out_error; |
| 1165 | } else |
| 1166 | nfs4_state_end_reclaim_nograce(clp); |
| 1167 | continue; |
| 1168 | } |
Trond Myklebust | 707fb4b | 2008-12-23 15:21:47 -0500 | [diff] [blame] | 1169 | |
| 1170 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
| 1171 | nfs_client_return_marked_delegations(clp); |
| 1172 | continue; |
| 1173 | } |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 1174 | |
| 1175 | nfs4_clear_state_manager_bit(clp); |
Trond Myklebust | f3c7649 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 1176 | /* Did we race with an attempt to give us more work? */ |
| 1177 | if (clp->cl_state == 0) |
| 1178 | break; |
| 1179 | if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
| 1180 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | } |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 1182 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | out_error: |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 1184 | printk(KERN_WARNING "Error: state manager failed on NFSv4 server %s" |
Chuck Lever | 5d8515c | 2007-12-10 14:57:16 -0500 | [diff] [blame] | 1185 | " with error %d\n", clp->cl_hostname, -status); |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1186 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
| 1187 | nfs4_state_end_reclaim_reboot(clp); |
Trond Myklebust | e005e80 | 2008-12-23 15:21:48 -0500 | [diff] [blame] | 1188 | nfs4_clear_state_manager_bit(clp); |
| 1189 | } |
| 1190 | |
| 1191 | static int nfs4_run_state_manager(void *ptr) |
| 1192 | { |
| 1193 | struct nfs_client *clp = ptr; |
| 1194 | |
| 1195 | allow_signal(SIGKILL); |
| 1196 | nfs4_state_manager(clp); |
| 1197 | nfs_put_client(clp); |
| 1198 | module_put_and_exit(0); |
| 1199 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | } |
| 1201 | |
| 1202 | /* |
| 1203 | * Local variables: |
| 1204 | * c-basic-offset: 8 |
| 1205 | * End: |
| 1206 | */ |