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 | { |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 65 | int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, |
| 66 | nfs_callback_tcpport, cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | if (status == 0) |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 68 | status = nfs4_proc_setclientid_confirm(clp, cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | if (status == 0) |
| 70 | nfs4_schedule_state_renewal(clp); |
| 71 | return status; |
| 72 | } |
| 73 | |
Trond Myklebust | 6dc9d57 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 74 | 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] | 75 | { |
| 76 | struct rpc_cred *cred = NULL; |
| 77 | |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 78 | if (clp->cl_machine_cred != NULL) |
| 79 | cred = get_rpccred(clp->cl_machine_cred); |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 80 | return cred; |
| 81 | } |
| 82 | |
| 83 | static void nfs4_clear_machine_cred(struct nfs_client *clp) |
| 84 | { |
| 85 | struct rpc_cred *cred; |
| 86 | |
| 87 | spin_lock(&clp->cl_lock); |
| 88 | cred = clp->cl_machine_cred; |
| 89 | clp->cl_machine_cred = NULL; |
| 90 | spin_unlock(&clp->cl_lock); |
| 91 | if (cred != NULL) |
| 92 | put_rpccred(cred); |
| 93 | } |
| 94 | |
Trond Myklebust | 6dc9d57 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 95 | struct rpc_cred *nfs4_get_renew_cred_locked(struct nfs_client *clp) |
Trond Myklebust | b4454fe | 2006-01-03 09:55:25 +0100 | [diff] [blame] | 96 | { |
| 97 | struct nfs4_state_owner *sp; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 98 | struct rb_node *pos; |
Trond Myklebust | b4454fe | 2006-01-03 09:55:25 +0100 | [diff] [blame] | 99 | struct rpc_cred *cred = NULL; |
| 100 | |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 101 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
| 102 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
Trond Myklebust | b4454fe | 2006-01-03 09:55:25 +0100 | [diff] [blame] | 103 | if (list_empty(&sp->so_states)) |
| 104 | continue; |
| 105 | cred = get_rpccred(sp->so_cred); |
| 106 | break; |
| 107 | } |
| 108 | return cred; |
| 109 | } |
| 110 | |
Trond Myklebust | 6dc9d57 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 111 | static struct rpc_cred *nfs4_get_renew_cred(struct nfs_client *clp) |
| 112 | { |
| 113 | struct rpc_cred *cred; |
| 114 | |
| 115 | spin_lock(&clp->cl_lock); |
| 116 | cred = nfs4_get_renew_cred_locked(clp); |
| 117 | spin_unlock(&clp->cl_lock); |
| 118 | return cred; |
| 119 | } |
| 120 | |
Trond Myklebust | 10afec9 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 121 | static struct rpc_cred *nfs4_get_setclientid_cred(struct nfs_client *clp) |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 122 | { |
| 123 | struct nfs4_state_owner *sp; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 124 | struct rb_node *pos; |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 125 | struct rpc_cred *cred; |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 126 | |
Trond Myklebust | 6dc9d57 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 127 | spin_lock(&clp->cl_lock); |
| 128 | cred = nfs4_get_machine_cred_locked(clp); |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 129 | if (cred != NULL) |
| 130 | goto out; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 131 | pos = rb_first(&clp->cl_state_owners); |
| 132 | if (pos != NULL) { |
| 133 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 134 | cred = get_rpccred(sp->so_cred); |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 135 | } |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 136 | out: |
Trond Myklebust | 6dc9d57 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 137 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | a2b2bb8 | 2008-04-08 16:02:17 -0400 | [diff] [blame] | 138 | return cred; |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 139 | } |
| 140 | |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 141 | static void nfs_alloc_unique_id(struct rb_root *root, struct nfs_unique_id *new, |
| 142 | __u64 minval, int maxbits) |
| 143 | { |
| 144 | struct rb_node **p, *parent; |
| 145 | struct nfs_unique_id *pos; |
| 146 | __u64 mask = ~0ULL; |
| 147 | |
| 148 | if (maxbits < 64) |
| 149 | mask = (1ULL << maxbits) - 1ULL; |
| 150 | |
| 151 | /* Ensure distribution is more or less flat */ |
| 152 | get_random_bytes(&new->id, sizeof(new->id)); |
| 153 | new->id &= mask; |
| 154 | if (new->id < minval) |
| 155 | new->id += minval; |
| 156 | retry: |
| 157 | p = &root->rb_node; |
| 158 | parent = NULL; |
| 159 | |
| 160 | while (*p != NULL) { |
| 161 | parent = *p; |
| 162 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); |
| 163 | |
| 164 | if (new->id < pos->id) |
| 165 | p = &(*p)->rb_left; |
| 166 | else if (new->id > pos->id) |
| 167 | p = &(*p)->rb_right; |
| 168 | else |
| 169 | goto id_exists; |
| 170 | } |
| 171 | rb_link_node(&new->rb_node, parent, p); |
| 172 | rb_insert_color(&new->rb_node, root); |
| 173 | return; |
| 174 | id_exists: |
| 175 | for (;;) { |
| 176 | new->id++; |
| 177 | if (new->id < minval || (new->id & mask) != new->id) { |
| 178 | new->id = minval; |
| 179 | break; |
| 180 | } |
| 181 | parent = rb_next(parent); |
| 182 | if (parent == NULL) |
| 183 | break; |
| 184 | pos = rb_entry(parent, struct nfs_unique_id, rb_node); |
| 185 | if (new->id < pos->id) |
| 186 | break; |
| 187 | } |
| 188 | goto retry; |
| 189 | } |
| 190 | |
| 191 | static void nfs_free_unique_id(struct rb_root *root, struct nfs_unique_id *id) |
| 192 | { |
| 193 | rb_erase(&id->rb_node, root); |
| 194 | } |
| 195 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | static struct nfs4_state_owner * |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 197 | nfs4_find_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | { |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 199 | struct nfs_client *clp = server->nfs_client; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 200 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
| 201 | *parent = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | struct nfs4_state_owner *sp, *res = NULL; |
| 203 | |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 204 | while (*p != NULL) { |
| 205 | parent = *p; |
| 206 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); |
| 207 | |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 208 | if (server < sp->so_server) { |
| 209 | p = &parent->rb_left; |
| 210 | continue; |
| 211 | } |
| 212 | if (server > sp->so_server) { |
| 213 | p = &parent->rb_right; |
| 214 | continue; |
| 215 | } |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 216 | if (cred < sp->so_cred) |
| 217 | p = &parent->rb_left; |
| 218 | else if (cred > sp->so_cred) |
| 219 | p = &parent->rb_right; |
| 220 | else { |
| 221 | atomic_inc(&sp->so_count); |
| 222 | res = sp; |
| 223 | break; |
| 224 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | } |
| 226 | return res; |
| 227 | } |
| 228 | |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 229 | static struct nfs4_state_owner * |
| 230 | nfs4_insert_state_owner(struct nfs_client *clp, struct nfs4_state_owner *new) |
| 231 | { |
| 232 | struct rb_node **p = &clp->cl_state_owners.rb_node, |
| 233 | *parent = NULL; |
| 234 | struct nfs4_state_owner *sp; |
| 235 | |
| 236 | while (*p != NULL) { |
| 237 | parent = *p; |
| 238 | sp = rb_entry(parent, struct nfs4_state_owner, so_client_node); |
| 239 | |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 240 | if (new->so_server < sp->so_server) { |
| 241 | p = &parent->rb_left; |
| 242 | continue; |
| 243 | } |
| 244 | if (new->so_server > sp->so_server) { |
| 245 | p = &parent->rb_right; |
| 246 | continue; |
| 247 | } |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 248 | if (new->so_cred < sp->so_cred) |
| 249 | p = &parent->rb_left; |
| 250 | else if (new->so_cred > sp->so_cred) |
| 251 | p = &parent->rb_right; |
| 252 | else { |
| 253 | atomic_inc(&sp->so_count); |
| 254 | return sp; |
| 255 | } |
| 256 | } |
| 257 | nfs_alloc_unique_id(&clp->cl_openowner_id, &new->so_owner_id, 1, 64); |
| 258 | rb_link_node(&new->so_client_node, parent, p); |
| 259 | rb_insert_color(&new->so_client_node, &clp->cl_state_owners); |
| 260 | return new; |
| 261 | } |
| 262 | |
| 263 | static void |
| 264 | nfs4_remove_state_owner(struct nfs_client *clp, struct nfs4_state_owner *sp) |
| 265 | { |
| 266 | if (!RB_EMPTY_NODE(&sp->so_client_node)) |
| 267 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); |
| 268 | nfs_free_unique_id(&clp->cl_openowner_id, &sp->so_owner_id); |
| 269 | } |
| 270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | /* |
| 272 | * nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to |
| 273 | * create a new state_owner. |
| 274 | * |
| 275 | */ |
| 276 | static struct nfs4_state_owner * |
| 277 | nfs4_alloc_state_owner(void) |
| 278 | { |
| 279 | struct nfs4_state_owner *sp; |
| 280 | |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 281 | sp = kzalloc(sizeof(*sp),GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | if (!sp) |
| 283 | return NULL; |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 284 | spin_lock_init(&sp->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | INIT_LIST_HEAD(&sp->so_states); |
| 286 | INIT_LIST_HEAD(&sp->so_delegations); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 287 | rpc_init_wait_queue(&sp->so_sequence.wait, "Seqid_waitqueue"); |
| 288 | sp->so_seqid.sequence = &sp->so_sequence; |
| 289 | spin_lock_init(&sp->so_sequence.lock); |
| 290 | INIT_LIST_HEAD(&sp->so_sequence.list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | atomic_set(&sp->so_count, 1); |
| 292 | return sp; |
| 293 | } |
| 294 | |
Adrian Bunk | 1d2e88e | 2008-05-02 13:42:45 -0700 | [diff] [blame] | 295 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | nfs4_drop_state_owner(struct nfs4_state_owner *sp) |
| 297 | { |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 298 | if (!RB_EMPTY_NODE(&sp->so_client_node)) { |
| 299 | struct nfs_client *clp = sp->so_client; |
| 300 | |
| 301 | spin_lock(&clp->cl_lock); |
| 302 | rb_erase(&sp->so_client_node, &clp->cl_state_owners); |
| 303 | RB_CLEAR_NODE(&sp->so_client_node); |
| 304 | spin_unlock(&clp->cl_lock); |
| 305 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
| 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, struct rpc_cred *cred) |
| 309 | { |
David Howells | 7539bba | 2006-08-22 20:06:09 -0400 | [diff] [blame] | 310 | struct nfs_client *clp = server->nfs_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | struct nfs4_state_owner *sp, *new; |
| 312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | spin_lock(&clp->cl_lock); |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 314 | sp = nfs4_find_state_owner(server, cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | spin_unlock(&clp->cl_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | if (sp != NULL) |
| 317 | return sp; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 318 | new = nfs4_alloc_state_owner(); |
| 319 | if (new == NULL) |
| 320 | return NULL; |
| 321 | new->so_client = clp; |
Trond Myklebust | 6f2e64d | 2007-07-06 10:53:21 -0400 | [diff] [blame] | 322 | new->so_server = server; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 323 | new->so_cred = cred; |
| 324 | spin_lock(&clp->cl_lock); |
| 325 | sp = nfs4_insert_state_owner(clp, new); |
| 326 | spin_unlock(&clp->cl_lock); |
| 327 | if (sp == new) |
| 328 | get_rpccred(cred); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 329 | else { |
| 330 | rpc_destroy_wait_queue(&new->so_sequence.wait); |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 331 | kfree(new); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 332 | } |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 333 | return sp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | } |
| 335 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
| 337 | { |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 338 | struct nfs_client *clp = sp->so_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | struct rpc_cred *cred = sp->so_cred; |
| 340 | |
| 341 | if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) |
| 342 | return; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 343 | nfs4_remove_state_owner(clp, sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 345 | rpc_destroy_wait_queue(&sp->so_sequence.wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | put_rpccred(cred); |
| 347 | kfree(sp); |
| 348 | } |
| 349 | |
| 350 | static struct nfs4_state * |
| 351 | nfs4_alloc_open_state(void) |
| 352 | { |
| 353 | struct nfs4_state *state; |
| 354 | |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 355 | state = kzalloc(sizeof(*state), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | if (!state) |
| 357 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | atomic_set(&state->count, 1); |
| 359 | INIT_LIST_HEAD(&state->lock_states); |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 360 | spin_lock_init(&state->state_lock); |
Trond Myklebust | 8bda4e4 | 2007-07-09 10:45:42 -0400 | [diff] [blame] | 361 | seqlock_init(&state->seqlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | return state; |
| 363 | } |
| 364 | |
Trond Myklebust | 4cecb76 | 2005-11-04 15:32:58 -0500 | [diff] [blame] | 365 | void |
| 366 | nfs4_state_set_mode_locked(struct nfs4_state *state, mode_t mode) |
| 367 | { |
| 368 | if (state->state == mode) |
| 369 | return; |
| 370 | /* NB! List reordering - see the reclaim code for why. */ |
| 371 | if ((mode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
| 372 | if (mode & FMODE_WRITE) |
| 373 | list_move(&state->open_states, &state->owner->so_states); |
| 374 | else |
| 375 | list_move_tail(&state->open_states, &state->owner->so_states); |
| 376 | } |
Trond Myklebust | 4cecb76 | 2005-11-04 15:32:58 -0500 | [diff] [blame] | 377 | state->state = mode; |
| 378 | } |
| 379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | static struct nfs4_state * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | __nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) |
| 382 | { |
| 383 | struct nfs_inode *nfsi = NFS_I(inode); |
| 384 | struct nfs4_state *state; |
| 385 | |
| 386 | list_for_each_entry(state, &nfsi->open_states, inode_states) { |
Trond Myklebust | 1c816ef | 2007-07-03 14:41:19 -0400 | [diff] [blame] | 387 | if (state->owner != owner) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | continue; |
Trond Myklebust | 1c816ef | 2007-07-03 14:41:19 -0400 | [diff] [blame] | 389 | if (atomic_inc_not_zero(&state->count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | return state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
| 392 | return NULL; |
| 393 | } |
| 394 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | static void |
| 396 | nfs4_free_open_state(struct nfs4_state *state) |
| 397 | { |
| 398 | kfree(state); |
| 399 | } |
| 400 | |
| 401 | struct nfs4_state * |
| 402 | nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) |
| 403 | { |
| 404 | struct nfs4_state *state, *new; |
| 405 | struct nfs_inode *nfsi = NFS_I(inode); |
| 406 | |
| 407 | spin_lock(&inode->i_lock); |
| 408 | state = __nfs4_find_state_byowner(inode, owner); |
| 409 | spin_unlock(&inode->i_lock); |
| 410 | if (state) |
| 411 | goto out; |
| 412 | new = nfs4_alloc_open_state(); |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 413 | spin_lock(&owner->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | spin_lock(&inode->i_lock); |
| 415 | state = __nfs4_find_state_byowner(inode, owner); |
| 416 | if (state == NULL && new != NULL) { |
| 417 | state = new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | state->owner = owner; |
| 419 | atomic_inc(&owner->so_count); |
| 420 | list_add(&state->inode_states, &nfsi->open_states); |
| 421 | state->inode = igrab(inode); |
| 422 | spin_unlock(&inode->i_lock); |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 423 | /* Note: The reclaim code dictates that we add stateless |
| 424 | * and read-only stateids to the end of the list */ |
| 425 | list_add_tail(&state->open_states, &owner->so_states); |
| 426 | spin_unlock(&owner->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | } else { |
| 428 | spin_unlock(&inode->i_lock); |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 429 | spin_unlock(&owner->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | if (new) |
| 431 | nfs4_free_open_state(new); |
| 432 | } |
| 433 | out: |
| 434 | return state; |
| 435 | } |
| 436 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | void nfs4_put_open_state(struct nfs4_state *state) |
| 438 | { |
| 439 | struct inode *inode = state->inode; |
| 440 | struct nfs4_state_owner *owner = state->owner; |
| 441 | |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 442 | if (!atomic_dec_and_lock(&state->count, &owner->so_lock)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | return; |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 444 | spin_lock(&inode->i_lock); |
Trond Myklebust | ba68303 | 2007-07-27 10:23:05 -0400 | [diff] [blame] | 445 | list_del(&state->inode_states); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | list_del(&state->open_states); |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 447 | spin_unlock(&inode->i_lock); |
| 448 | spin_unlock(&owner->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | iput(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | nfs4_free_open_state(state); |
| 451 | nfs4_put_state_owner(owner); |
| 452 | } |
| 453 | |
| 454 | /* |
Trond Myklebust | 83c9d41 | 2005-10-18 14:20:13 -0700 | [diff] [blame] | 455 | * Close the current file. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | */ |
Trond Myklebust | a49c3c7 | 2007-10-18 18:03:27 -0400 | [diff] [blame] | 457 | static void __nfs4_close(struct path *path, struct nfs4_state *state, mode_t mode, int wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | struct nfs4_state_owner *owner = state->owner; |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 460 | int call_close = 0; |
| 461 | int newstate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
| 463 | atomic_inc(&owner->so_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | /* Protect against nfs4_find_state() */ |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 465 | spin_lock(&owner->so_lock); |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 466 | switch (mode & (FMODE_READ | FMODE_WRITE)) { |
| 467 | case FMODE_READ: |
| 468 | state->n_rdonly--; |
| 469 | break; |
| 470 | case FMODE_WRITE: |
| 471 | state->n_wronly--; |
| 472 | break; |
| 473 | case FMODE_READ|FMODE_WRITE: |
| 474 | state->n_rdwr--; |
| 475 | } |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 476 | newstate = FMODE_READ|FMODE_WRITE; |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 477 | if (state->n_rdwr == 0) { |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 478 | if (state->n_rdonly == 0) { |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 479 | newstate &= ~FMODE_READ; |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 480 | call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
| 481 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); |
| 482 | } |
| 483 | if (state->n_wronly == 0) { |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 484 | newstate &= ~FMODE_WRITE; |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 485 | call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
| 486 | call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); |
| 487 | } |
| 488 | if (newstate == 0) |
| 489 | clear_bit(NFS_DELEGATED_STATE, &state->flags); |
Trond Myklebust | e761692 | 2006-01-03 09:55:13 +0100 | [diff] [blame] | 490 | } |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 491 | nfs4_state_set_mode_locked(state, newstate); |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 492 | spin_unlock(&owner->so_lock); |
Trond Myklebust | 4cecb76 | 2005-11-04 15:32:58 -0500 | [diff] [blame] | 493 | |
Trond Myklebust | 003707c | 2007-07-05 18:07:55 -0400 | [diff] [blame] | 494 | if (!call_close) { |
Trond Myklebust | b39e625 | 2007-06-11 23:05:07 -0400 | [diff] [blame] | 495 | nfs4_put_open_state(state); |
| 496 | nfs4_put_state_owner(owner); |
| 497 | } else |
Trond Myklebust | a49c3c7 | 2007-10-18 18:03:27 -0400 | [diff] [blame] | 498 | nfs4_do_close(path, state, wait); |
| 499 | } |
| 500 | |
| 501 | void nfs4_close_state(struct path *path, struct nfs4_state *state, mode_t mode) |
| 502 | { |
| 503 | __nfs4_close(path, state, mode, 0); |
| 504 | } |
| 505 | |
| 506 | void nfs4_close_sync(struct path *path, struct nfs4_state *state, mode_t mode) |
| 507 | { |
| 508 | __nfs4_close(path, state, mode, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | } |
| 510 | |
| 511 | /* |
| 512 | * Search the state->lock_states for an existing lock_owner |
| 513 | * that is compatible with current->files |
| 514 | */ |
| 515 | static struct nfs4_lock_state * |
| 516 | __nfs4_find_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) |
| 517 | { |
| 518 | struct nfs4_lock_state *pos; |
| 519 | list_for_each_entry(pos, &state->lock_states, ls_locks) { |
| 520 | if (pos->ls_owner != fl_owner) |
| 521 | continue; |
| 522 | atomic_inc(&pos->ls_count); |
| 523 | return pos; |
| 524 | } |
| 525 | return NULL; |
| 526 | } |
| 527 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | /* |
| 529 | * Return a compatible lock_state. If no initialized lock_state structure |
| 530 | * exists, return an uninitialized one. |
| 531 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | */ |
| 533 | static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) |
| 534 | { |
| 535 | struct nfs4_lock_state *lsp; |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 536 | struct nfs_client *clp = state->owner->so_client; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 538 | lsp = kzalloc(sizeof(*lsp), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | if (lsp == NULL) |
| 540 | return NULL; |
Trond Myklebust | d0dc370 | 2008-01-10 16:07:54 -0500 | [diff] [blame] | 541 | rpc_init_wait_queue(&lsp->ls_sequence.wait, "lock_seqid_waitqueue"); |
| 542 | spin_lock_init(&lsp->ls_sequence.lock); |
| 543 | INIT_LIST_HEAD(&lsp->ls_sequence.list); |
| 544 | lsp->ls_seqid.sequence = &lsp->ls_sequence; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | atomic_set(&lsp->ls_count, 1); |
| 546 | lsp->ls_owner = fl_owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | spin_lock(&clp->cl_lock); |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 548 | 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] | 549 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 550 | INIT_LIST_HEAD(&lsp->ls_locks); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | return lsp; |
| 552 | } |
| 553 | |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 554 | static void nfs4_free_lock_state(struct nfs4_lock_state *lsp) |
| 555 | { |
| 556 | struct nfs_client *clp = lsp->ls_state->owner->so_client; |
| 557 | |
| 558 | spin_lock(&clp->cl_lock); |
| 559 | nfs_free_unique_id(&clp->cl_lockowner_id, &lsp->ls_id); |
| 560 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 561 | rpc_destroy_wait_queue(&lsp->ls_sequence.wait); |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 562 | kfree(lsp); |
| 563 | } |
| 564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | /* |
| 566 | * Return a compatible lock_state. If no initialized lock_state structure |
| 567 | * exists, return an uninitialized one. |
| 568 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | */ |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 570 | 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] | 571 | { |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 572 | struct nfs4_lock_state *lsp, *new = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 574 | for(;;) { |
| 575 | spin_lock(&state->state_lock); |
| 576 | lsp = __nfs4_find_lock_state(state, owner); |
| 577 | if (lsp != NULL) |
| 578 | break; |
| 579 | if (new != NULL) { |
| 580 | new->ls_state = state; |
| 581 | list_add(&new->ls_locks, &state->lock_states); |
| 582 | set_bit(LK_STATE_IN_USE, &state->flags); |
| 583 | lsp = new; |
| 584 | new = NULL; |
| 585 | break; |
| 586 | } |
| 587 | spin_unlock(&state->state_lock); |
| 588 | new = nfs4_alloc_lock_state(state, owner); |
| 589 | if (new == NULL) |
| 590 | return NULL; |
| 591 | } |
| 592 | spin_unlock(&state->state_lock); |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 593 | if (new != NULL) |
| 594 | nfs4_free_lock_state(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | return lsp; |
| 596 | } |
| 597 | |
| 598 | /* |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 599 | * Release reference to lock_state, and free it if we see that |
| 600 | * it is no longer in use |
| 601 | */ |
Trond Myklebust | faf5f49 | 2005-10-18 14:20:15 -0700 | [diff] [blame] | 602 | void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 603 | { |
| 604 | struct nfs4_state *state; |
| 605 | |
| 606 | if (lsp == NULL) |
| 607 | return; |
| 608 | state = lsp->ls_state; |
| 609 | if (!atomic_dec_and_lock(&lsp->ls_count, &state->state_lock)) |
| 610 | return; |
| 611 | list_del(&lsp->ls_locks); |
| 612 | if (list_empty(&state->lock_states)) |
| 613 | clear_bit(LK_STATE_IN_USE, &state->flags); |
| 614 | spin_unlock(&state->state_lock); |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 615 | nfs4_free_lock_state(lsp); |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 616 | } |
| 617 | |
| 618 | static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
| 619 | { |
| 620 | struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
| 621 | |
| 622 | dst->fl_u.nfs4_fl.owner = lsp; |
| 623 | atomic_inc(&lsp->ls_count); |
| 624 | } |
| 625 | |
| 626 | static void nfs4_fl_release_lock(struct file_lock *fl) |
| 627 | { |
| 628 | nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
| 629 | } |
| 630 | |
| 631 | static struct file_lock_operations nfs4_fl_lock_ops = { |
| 632 | .fl_copy_lock = nfs4_fl_copy_lock, |
| 633 | .fl_release_private = nfs4_fl_release_lock, |
| 634 | }; |
| 635 | |
| 636 | int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) |
| 637 | { |
| 638 | struct nfs4_lock_state *lsp; |
| 639 | |
| 640 | if (fl->fl_ops != NULL) |
| 641 | return 0; |
| 642 | lsp = nfs4_get_lock_state(state, fl->fl_owner); |
| 643 | if (lsp == NULL) |
| 644 | return -ENOMEM; |
| 645 | fl->fl_u.nfs4_fl.owner = lsp; |
| 646 | fl->fl_ops = &nfs4_fl_lock_ops; |
| 647 | return 0; |
| 648 | } |
| 649 | |
| 650 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | * Byte-range lock aware utility to initialize the stateid of read/write |
| 652 | * requests. |
| 653 | */ |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 654 | 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] | 655 | { |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 656 | struct nfs4_lock_state *lsp; |
Trond Myklebust | 8bda4e4 | 2007-07-09 10:45:42 -0400 | [diff] [blame] | 657 | int seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | |
Trond Myklebust | 8bda4e4 | 2007-07-09 10:45:42 -0400 | [diff] [blame] | 659 | do { |
| 660 | seq = read_seqbegin(&state->seqlock); |
| 661 | memcpy(dst, &state->stateid, sizeof(*dst)); |
| 662 | } while (read_seqretry(&state->seqlock, seq)); |
Trond Myklebust | 8d0a8a9 | 2005-06-22 17:16:32 +0000 | [diff] [blame] | 663 | if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
| 664 | return; |
| 665 | |
| 666 | spin_lock(&state->state_lock); |
| 667 | lsp = __nfs4_find_lock_state(state, fl_owner); |
| 668 | if (lsp != NULL && (lsp->ls_flags & NFS_LOCK_INITIALIZED) != 0) |
| 669 | memcpy(dst, &lsp->ls_stateid, sizeof(*dst)); |
| 670 | spin_unlock(&state->state_lock); |
| 671 | nfs4_put_lock_state(lsp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | } |
| 673 | |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 674 | struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | { |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 676 | struct nfs_seqid *new; |
| 677 | |
| 678 | new = kmalloc(sizeof(*new), GFP_KERNEL); |
| 679 | if (new != NULL) { |
| 680 | new->sequence = counter; |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 681 | INIT_LIST_HEAD(&new->list); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 682 | } |
| 683 | return new; |
| 684 | } |
| 685 | |
| 686 | void nfs_free_seqid(struct nfs_seqid *seqid) |
| 687 | { |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 688 | if (!list_empty(&seqid->list)) { |
| 689 | struct rpc_sequence *sequence = seqid->sequence->sequence; |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 690 | |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 691 | spin_lock(&sequence->lock); |
| 692 | list_del(&seqid->list); |
| 693 | spin_unlock(&sequence->lock); |
| 694 | rpc_wake_up(&sequence->wait); |
| 695 | } |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 696 | kfree(seqid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | } |
| 698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | /* |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 700 | * Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
| 701 | * failed with a seqid incrementing error - |
| 702 | * see comments nfs_fs.h:seqid_mutating_error() |
| 703 | */ |
Trond Myklebust | 88d9093 | 2007-07-02 14:03:03 -0400 | [diff] [blame] | 704 | static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | { |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 706 | 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] | 707 | switch (status) { |
| 708 | case 0: |
| 709 | break; |
| 710 | case -NFS4ERR_BAD_SEQID: |
Trond Myklebust | 6f43ddc | 2007-07-08 16:49:11 -0400 | [diff] [blame] | 711 | if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
| 712 | return; |
| 713 | printk(KERN_WARNING "NFS: v4 server returned a bad" |
Dan Muntz | 497799e | 2008-02-13 13:09:35 -0800 | [diff] [blame] | 714 | " sequence-id error on an" |
| 715 | " unconfirmed sequence %p!\n", |
Trond Myklebust | 6f43ddc | 2007-07-08 16:49:11 -0400 | [diff] [blame] | 716 | seqid->sequence); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 717 | case -NFS4ERR_STALE_CLIENTID: |
| 718 | case -NFS4ERR_STALE_STATEID: |
| 719 | case -NFS4ERR_BAD_STATEID: |
| 720 | case -NFS4ERR_BADXDR: |
| 721 | case -NFS4ERR_RESOURCE: |
| 722 | case -NFS4ERR_NOFILEHANDLE: |
| 723 | /* Non-seqid mutating errors */ |
| 724 | return; |
| 725 | }; |
| 726 | /* |
| 727 | * Note: no locking needed as we are guaranteed to be first |
| 728 | * on the sequence list |
| 729 | */ |
| 730 | seqid->sequence->counter++; |
| 731 | } |
| 732 | |
| 733 | void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) |
| 734 | { |
| 735 | if (status == -NFS4ERR_BAD_SEQID) { |
| 736 | struct nfs4_state_owner *sp = container_of(seqid->sequence, |
| 737 | struct nfs4_state_owner, so_seqid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | nfs4_drop_state_owner(sp); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 739 | } |
Trond Myklebust | 88d9093 | 2007-07-02 14:03:03 -0400 | [diff] [blame] | 740 | nfs_increment_seqid(status, seqid); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | /* |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 744 | * Increment the seqid if the LOCK/LOCKU succeeded, or |
| 745 | * failed with a seqid incrementing error - |
| 746 | * see comments nfs_fs.h:seqid_mutating_error() |
| 747 | */ |
| 748 | void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) |
| 749 | { |
Trond Myklebust | 88d9093 | 2007-07-02 14:03:03 -0400 | [diff] [blame] | 750 | nfs_increment_seqid(status, seqid); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 751 | } |
| 752 | |
| 753 | int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) |
| 754 | { |
| 755 | struct rpc_sequence *sequence = seqid->sequence->sequence; |
| 756 | int status = 0; |
| 757 | |
| 758 | spin_lock(&sequence->lock); |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 759 | if (list_empty(&seqid->list)) |
| 760 | list_add_tail(&seqid->list, &sequence->list); |
| 761 | if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) |
| 762 | goto unlock; |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 763 | rpc_sleep_on(&sequence->wait, task, NULL); |
Trond Myklebust | 2f74c0a | 2008-01-08 17:56:07 -0500 | [diff] [blame] | 764 | status = -EAGAIN; |
| 765 | unlock: |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 766 | spin_unlock(&sequence->lock); |
| 767 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | } |
| 769 | |
| 770 | static int reclaimer(void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 772 | static inline void nfs4_clear_recover_bit(struct nfs_client *clp) |
Trond Myklebust | 433fbe4 | 2006-01-03 09:55:22 +0100 | [diff] [blame] | 773 | { |
| 774 | smp_mb__before_clear_bit(); |
| 775 | clear_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state); |
| 776 | smp_mb__after_clear_bit(); |
| 777 | wake_up_bit(&clp->cl_state, NFS4CLNT_STATE_RECOVER); |
| 778 | rpc_wake_up(&clp->cl_rpcwaitq); |
| 779 | } |
| 780 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | /* |
| 782 | * State recovery routine |
| 783 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 784 | static void nfs4_recover_state(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | { |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 786 | struct task_struct *task; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 788 | __module_get(THIS_MODULE); |
| 789 | atomic_inc(&clp->cl_count); |
Chuck Lever | 5d8515c | 2007-12-10 14:57:16 -0500 | [diff] [blame] | 790 | task = kthread_run(reclaimer, clp, "%s-reclaim", |
| 791 | rpc_peeraddr2str(clp->cl_rpcclient, |
| 792 | RPC_DISPLAY_ADDR)); |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 793 | if (!IS_ERR(task)) |
| 794 | return; |
Trond Myklebust | 433fbe4 | 2006-01-03 09:55:22 +0100 | [diff] [blame] | 795 | nfs4_clear_recover_bit(clp); |
David Howells | 24c8dbb | 2006-08-22 20:06:10 -0400 | [diff] [blame] | 796 | nfs_put_client(clp); |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 797 | module_put(THIS_MODULE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | } |
| 799 | |
| 800 | /* |
| 801 | * Schedule a state recovery attempt |
| 802 | */ |
David Howells | adfa6f9 | 2006-08-22 20:06:08 -0400 | [diff] [blame] | 803 | void nfs4_schedule_state_recovery(struct nfs_client *clp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | { |
| 805 | if (!clp) |
| 806 | return; |
Trond Myklebust | e598d84 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 807 | if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
| 808 | set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
Trond Myklebust | 433fbe4 | 2006-01-03 09:55:22 +0100 | [diff] [blame] | 809 | if (test_and_set_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) == 0) |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 810 | nfs4_recover_state(clp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | } |
| 812 | |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 813 | static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
| 814 | { |
| 815 | |
| 816 | set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
| 817 | /* Don't recover state that expired before the reboot */ |
| 818 | if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { |
| 819 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
| 820 | return 0; |
| 821 | } |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 822 | set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 823 | set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
| 824 | return 1; |
| 825 | } |
| 826 | |
Trond Myklebust | 9e33bed | 2008-12-23 15:21:46 -0500 | [diff] [blame] | 827 | 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] | 828 | { |
| 829 | set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); |
| 830 | clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 831 | set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 832 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
| 833 | return 1; |
| 834 | } |
| 835 | |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 836 | 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] | 837 | { |
| 838 | struct inode *inode = state->inode; |
Trond Myklebust | 19e03c5 | 2008-12-23 15:21:44 -0500 | [diff] [blame] | 839 | struct nfs_inode *nfsi = NFS_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | struct file_lock *fl; |
| 841 | int status = 0; |
| 842 | |
Trond Myklebust | 19e03c5 | 2008-12-23 15:21:44 -0500 | [diff] [blame] | 843 | down_write(&nfsi->rwsem); |
Harvey Harrison | 90dc7d2 | 2008-02-20 13:03:05 -0800 | [diff] [blame] | 844 | for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) { |
Trond Myklebust | 43b2a33 | 2005-11-04 15:35:30 -0500 | [diff] [blame] | 845 | if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | continue; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 847 | if (nfs_file_open_context(fl->fl_file)->state != state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | continue; |
| 849 | status = ops->recover_lock(state, fl); |
| 850 | if (status >= 0) |
| 851 | continue; |
| 852 | switch (status) { |
| 853 | default: |
| 854 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 855 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | case -NFS4ERR_EXPIRED: |
| 857 | case -NFS4ERR_NO_GRACE: |
| 858 | case -NFS4ERR_RECLAIM_BAD: |
| 859 | case -NFS4ERR_RECLAIM_CONFLICT: |
Trond Myklebust | 43b2a33 | 2005-11-04 15:35:30 -0500 | [diff] [blame] | 860 | /* kill_proc(fl->fl_pid, SIGLOST, 1); */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | break; |
| 862 | case -NFS4ERR_STALE_CLIENTID: |
| 863 | goto out_err; |
| 864 | } |
| 865 | } |
Trond Myklebust | 19e03c5 | 2008-12-23 15:21:44 -0500 | [diff] [blame] | 866 | up_write(&nfsi->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | return 0; |
| 868 | out_err: |
Trond Myklebust | 19e03c5 | 2008-12-23 15:21:44 -0500 | [diff] [blame] | 869 | up_write(&nfsi->rwsem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | return status; |
| 871 | } |
| 872 | |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 873 | 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] | 874 | { |
| 875 | struct nfs4_state *state; |
| 876 | struct nfs4_lock_state *lock; |
| 877 | int status = 0; |
| 878 | |
| 879 | /* Note: we rely on the sp->so_states list being ordered |
| 880 | * so that we always reclaim open(O_RDWR) and/or open(O_WRITE) |
| 881 | * states first. |
| 882 | * This is needed to ensure that the server won't give us any |
| 883 | * read delegations that we have to return if, say, we are |
| 884 | * recovering after a network partition or a reboot from a |
| 885 | * server that doesn't support a grace period. |
| 886 | */ |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 887 | restart: |
| 888 | spin_lock(&sp->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | list_for_each_entry(state, &sp->so_states, open_states) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 890 | if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
| 891 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | if (state->state == 0) |
| 893 | continue; |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 894 | atomic_inc(&state->count); |
| 895 | spin_unlock(&sp->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | status = ops->recover_open(sp, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | if (status >= 0) { |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 898 | status = nfs4_reclaim_locks(state, ops); |
| 899 | if (status >= 0) { |
| 900 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
| 901 | if (!(lock->ls_flags & NFS_LOCK_INITIALIZED)) |
| 902 | printk("%s: Lock reclaim failed!\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 903 | __func__); |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 904 | } |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 905 | nfs4_put_open_state(state); |
| 906 | goto restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | } |
| 909 | switch (status) { |
| 910 | default: |
| 911 | printk(KERN_ERR "%s: unhandled error %d. Zeroing state\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 912 | __func__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | case -ENOENT: |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 914 | case -ESTALE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | /* |
| 916 | * Open state on this file cannot be recovered |
| 917 | * All we can do is revert to using the zero stateid. |
| 918 | */ |
| 919 | memset(state->stateid.data, 0, |
| 920 | sizeof(state->stateid.data)); |
| 921 | /* Mark the file as being 'closed' */ |
| 922 | state->state = 0; |
| 923 | break; |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 924 | case -NFS4ERR_RECLAIM_BAD: |
| 925 | case -NFS4ERR_RECLAIM_CONFLICT: |
| 926 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); |
| 927 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | case -NFS4ERR_EXPIRED: |
| 929 | case -NFS4ERR_NO_GRACE: |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 930 | nfs4_state_mark_reclaim_nograce(sp->so_client, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | case -NFS4ERR_STALE_CLIENTID: |
| 932 | goto out_err; |
| 933 | } |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 934 | nfs4_put_open_state(state); |
| 935 | goto restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | } |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 937 | spin_unlock(&sp->so_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | return 0; |
| 939 | out_err: |
Trond Myklebust | fe1d819 | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 940 | nfs4_put_open_state(state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | return status; |
| 942 | } |
| 943 | |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 944 | static void nfs4_clear_open_state(struct nfs4_state *state) |
| 945 | { |
| 946 | struct nfs4_lock_state *lock; |
| 947 | |
| 948 | clear_bit(NFS_DELEGATED_STATE, &state->flags); |
| 949 | clear_bit(NFS_O_RDONLY_STATE, &state->flags); |
| 950 | clear_bit(NFS_O_WRONLY_STATE, &state->flags); |
| 951 | clear_bit(NFS_O_RDWR_STATE, &state->flags); |
| 952 | list_for_each_entry(lock, &state->lock_states, ls_locks) { |
| 953 | lock->ls_seqid.counter = 0; |
| 954 | lock->ls_seqid.flags = 0; |
| 955 | lock->ls_flags &= ~NFS_LOCK_INITIALIZED; |
| 956 | } |
| 957 | } |
| 958 | |
| 959 | 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] | 960 | { |
| 961 | struct nfs4_state_owner *sp; |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 962 | struct rb_node *pos; |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 963 | struct nfs4_state *state; |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 964 | |
| 965 | /* Reset all sequence ids to zero */ |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 966 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
| 967 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 968 | sp->so_seqid.counter = 0; |
| 969 | sp->so_seqid.flags = 0; |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 970 | spin_lock(&sp->so_lock); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 971 | list_for_each_entry(state, &sp->so_states, open_states) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 972 | if (mark_reclaim(clp, state)) |
| 973 | nfs4_clear_open_state(state); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 974 | } |
Trond Myklebust | ec07342 | 2005-10-20 14:22:47 -0700 | [diff] [blame] | 975 | spin_unlock(&sp->so_lock); |
Trond Myklebust | cee54fc | 2005-10-18 14:20:12 -0700 | [diff] [blame] | 976 | } |
| 977 | } |
| 978 | |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 979 | static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
| 980 | { |
| 981 | /* Mark all delegations for reclaim */ |
| 982 | nfs_delegation_mark_reclaim(clp); |
| 983 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); |
| 984 | } |
| 985 | |
| 986 | static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) |
| 987 | { |
| 988 | struct nfs4_state_owner *sp; |
| 989 | struct rb_node *pos; |
| 990 | struct nfs4_state *state; |
| 991 | |
| 992 | if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
| 993 | return; |
| 994 | |
| 995 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
| 996 | sp = rb_entry(pos, struct nfs4_state_owner, so_client_node); |
| 997 | spin_lock(&sp->so_lock); |
| 998 | list_for_each_entry(state, &sp->so_states, open_states) { |
| 999 | if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags)) |
| 1000 | continue; |
| 1001 | nfs4_state_mark_reclaim_nograce(clp, state); |
| 1002 | } |
| 1003 | spin_unlock(&sp->so_lock); |
| 1004 | } |
| 1005 | |
| 1006 | nfs_delegation_reap_unclaimed(clp); |
| 1007 | } |
| 1008 | |
| 1009 | static void nfs_delegation_clear_all(struct nfs_client *clp) |
| 1010 | { |
| 1011 | nfs_delegation_mark_reclaim(clp); |
| 1012 | nfs_delegation_reap_unclaimed(clp); |
| 1013 | } |
| 1014 | |
| 1015 | static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) |
| 1016 | { |
| 1017 | nfs_delegation_clear_all(clp); |
| 1018 | nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); |
| 1019 | } |
| 1020 | |
| 1021 | static void nfs4_state_end_reclaim_nograce(struct nfs_client *clp) |
| 1022 | { |
| 1023 | clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
| 1024 | } |
| 1025 | |
Trond Myklebust | e598d84 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1026 | static void nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
| 1027 | { |
| 1028 | switch (error) { |
| 1029 | case -NFS4ERR_CB_PATH_DOWN: |
Trond Myklebust | 707fb4b | 2008-12-23 15:21:47 -0500 | [diff] [blame^] | 1030 | nfs_handle_cb_pathdown(clp); |
Trond Myklebust | e598d84 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1031 | break; |
| 1032 | case -NFS4ERR_STALE_CLIENTID: |
| 1033 | case -NFS4ERR_LEASE_MOVED: |
| 1034 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
| 1035 | nfs4_state_start_reclaim_reboot(clp); |
| 1036 | break; |
| 1037 | case -NFS4ERR_EXPIRED: |
| 1038 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
| 1039 | nfs4_state_start_reclaim_nograce(clp); |
| 1040 | } |
| 1041 | } |
| 1042 | |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1043 | 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] | 1044 | { |
Trond Myklebust | 9f958ab | 2007-07-02 13:58:33 -0400 | [diff] [blame] | 1045 | struct rb_node *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | int status = 0; |
| 1047 | |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 1048 | restart: |
| 1049 | spin_lock(&clp->cl_lock); |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1050 | for (pos = rb_first(&clp->cl_state_owners); pos != NULL; pos = rb_next(pos)) { |
| 1051 | 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] | 1052 | if (!test_and_clear_bit(ops->owner_flag_bit, &sp->so_flags)) |
| 1053 | continue; |
| 1054 | atomic_inc(&sp->so_count); |
| 1055 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1056 | status = nfs4_reclaim_open_state(sp, ops); |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 1057 | if (status < 0) { |
| 1058 | set_bit(ops->owner_flag_bit, &sp->so_flags); |
| 1059 | nfs4_put_state_owner(sp); |
| 1060 | nfs4_recovery_handle_error(clp, status); |
| 1061 | return status; |
| 1062 | } |
| 1063 | nfs4_put_state_owner(sp); |
| 1064 | goto restart; |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1065 | } |
Trond Myklebust | 7eff03a | 2008-12-23 15:21:43 -0500 | [diff] [blame] | 1066 | spin_unlock(&clp->cl_lock); |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1067 | return status; |
| 1068 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1070 | static int nfs4_check_lease(struct nfs_client *clp) |
| 1071 | { |
| 1072 | struct rpc_cred *cred; |
| 1073 | int status = -NFS4ERR_EXPIRED; |
| 1074 | |
Trond Myklebust | 0f605b5 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1075 | /* Is the client already known to have an expired lease? */ |
| 1076 | if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
| 1077 | return 0; |
Trond Myklebust | 286d7d6 | 2006-01-03 09:55:26 +0100 | [diff] [blame] | 1078 | cred = nfs4_get_renew_cred(clp); |
Trond Myklebust | 0f605b5 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1079 | if (cred == NULL) { |
| 1080 | cred = nfs4_get_setclientid_cred(clp); |
| 1081 | if (cred == NULL) |
| 1082 | goto out; |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1083 | } |
Trond Myklebust | 0f605b5 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1084 | status = nfs4_proc_renew(clp, cred); |
| 1085 | put_rpccred(cred); |
| 1086 | out: |
| 1087 | nfs4_recovery_handle_error(clp, status); |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1088 | return status; |
| 1089 | } |
| 1090 | |
| 1091 | static int nfs4_reclaim_lease(struct nfs_client *clp) |
| 1092 | { |
| 1093 | struct rpc_cred *cred; |
| 1094 | int status = -ENOENT; |
| 1095 | |
| 1096 | cred = nfs4_get_setclientid_cred(clp); |
| 1097 | if (cred != NULL) { |
| 1098 | status = nfs4_init_client(clp, cred); |
| 1099 | put_rpccred(cred); |
| 1100 | /* Handle case where the user hasn't set up machine creds */ |
| 1101 | if (status == -EACCES && cred == clp->cl_machine_cred) { |
| 1102 | nfs4_clear_machine_cred(clp); |
| 1103 | status = -EAGAIN; |
| 1104 | } |
| 1105 | } |
| 1106 | return status; |
| 1107 | } |
| 1108 | |
| 1109 | static int reclaimer(void *ptr) |
| 1110 | { |
| 1111 | struct nfs_client *clp = ptr; |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1112 | int status = 0; |
| 1113 | |
| 1114 | allow_signal(SIGKILL); |
| 1115 | |
| 1116 | /* Ensure exclusive access to NFSv4 state */ |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1117 | while (!list_empty(&clp->cl_superblocks)) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1118 | if (test_and_clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
| 1119 | /* We're going to have to re-establish a clientid */ |
| 1120 | status = nfs4_reclaim_lease(clp); |
| 1121 | if (status) { |
| 1122 | set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
| 1123 | if (status == -EAGAIN) |
| 1124 | continue; |
| 1125 | goto out_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1126 | } |
Trond Myklebust | e598d84 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1127 | clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
| 1128 | } |
| 1129 | |
| 1130 | if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
| 1131 | status = nfs4_check_lease(clp); |
| 1132 | if (status != 0) |
| 1133 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | } |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1135 | |
| 1136 | /* First recover reboot state... */ |
| 1137 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1138 | status = nfs4_do_reclaim(clp, &nfs4_reboot_recovery_ops); |
Trond Myklebust | e598d84 | 2008-12-23 15:21:42 -0500 | [diff] [blame] | 1139 | if (status == -NFS4ERR_STALE_CLIENTID) |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1140 | continue; |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1141 | nfs4_state_end_reclaim_reboot(clp); |
| 1142 | continue; |
| 1143 | } |
| 1144 | |
| 1145 | /* Now recover expired state... */ |
| 1146 | if (test_and_clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1147 | status = nfs4_do_reclaim(clp, &nfs4_nograce_recovery_ops); |
| 1148 | if (status < 0) { |
| 1149 | set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
| 1150 | if (status == -NFS4ERR_STALE_CLIENTID) |
| 1151 | continue; |
| 1152 | if (status == -NFS4ERR_EXPIRED) |
| 1153 | continue; |
| 1154 | goto out_error; |
| 1155 | } else |
| 1156 | nfs4_state_end_reclaim_nograce(clp); |
| 1157 | continue; |
| 1158 | } |
Trond Myklebust | 707fb4b | 2008-12-23 15:21:47 -0500 | [diff] [blame^] | 1159 | |
| 1160 | if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
| 1161 | nfs_client_return_marked_delegations(clp); |
| 1162 | continue; |
| 1163 | } |
Trond Myklebust | 0286001 | 2008-12-23 15:21:40 -0500 | [diff] [blame] | 1164 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | out: |
Trond Myklebust | 433fbe4 | 2006-01-03 09:55:22 +0100 | [diff] [blame] | 1167 | nfs4_clear_recover_bit(clp); |
David Howells | 24c8dbb | 2006-08-22 20:06:10 -0400 | [diff] [blame] | 1168 | nfs_put_client(clp); |
Trond Myklebust | 5043e90 | 2006-01-03 09:55:23 +0100 | [diff] [blame] | 1169 | module_put_and_exit(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | return 0; |
| 1171 | out_error: |
Chuck Lever | 5d8515c | 2007-12-10 14:57:16 -0500 | [diff] [blame] | 1172 | printk(KERN_WARNING "Error: state recovery failed on NFSv4 server %s" |
| 1173 | " with error %d\n", clp->cl_hostname, -status); |
Trond Myklebust | b79a4a1 | 2008-12-23 15:21:41 -0500 | [diff] [blame] | 1174 | if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
| 1175 | nfs4_state_end_reclaim_reboot(clp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | goto out; |
| 1177 | } |
| 1178 | |
| 1179 | /* |
| 1180 | * Local variables: |
| 1181 | * c-basic-offset: 8 |
| 1182 | * End: |
| 1183 | */ |