| 1 | /* |
| 2 | * Copyright (c) 2004 The Regents of the University of Michigan. |
| 3 | * Copyright (c) 2012 Jeff Layton <jlayton@redhat.com> |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Andy Adamson <andros@citi.umich.edu> |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * 3. Neither the name of the University nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 24 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 28 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 29 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 30 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 31 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 32 | * |
| 33 | */ |
| 34 | |
| 35 | #include <crypto/hash.h> |
| 36 | #include <linux/file.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/namei.h> |
| 39 | #include <linux/sched.h> |
| 40 | #include <linux/fs.h> |
| 41 | #include <linux/module.h> |
| 42 | #include <net/net_namespace.h> |
| 43 | #include <linux/sunrpc/rpc_pipe_fs.h> |
| 44 | #include <linux/sunrpc/clnt.h> |
| 45 | #include <linux/nfsd/cld.h> |
| 46 | |
| 47 | #include "nfsd.h" |
| 48 | #include "state.h" |
| 49 | #include "vfs.h" |
| 50 | #include "netns.h" |
| 51 | |
| 52 | #define NFSDDBG_FACILITY NFSDDBG_PROC |
| 53 | |
| 54 | /* Declarations */ |
| 55 | struct nfsd4_client_tracking_ops { |
| 56 | int (*init)(struct net *); |
| 57 | void (*exit)(struct net *); |
| 58 | void (*create)(struct nfs4_client *); |
| 59 | void (*remove)(struct nfs4_client *); |
| 60 | int (*check)(struct nfs4_client *); |
| 61 | void (*grace_done)(struct nfsd_net *); |
| 62 | }; |
| 63 | |
| 64 | /* Globals */ |
| 65 | static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery"; |
| 66 | |
| 67 | static int |
| 68 | nfs4_save_creds(const struct cred **original_creds) |
| 69 | { |
| 70 | struct cred *new; |
| 71 | |
| 72 | new = prepare_creds(); |
| 73 | if (!new) |
| 74 | return -ENOMEM; |
| 75 | |
| 76 | new->fsuid = GLOBAL_ROOT_UID; |
| 77 | new->fsgid = GLOBAL_ROOT_GID; |
| 78 | *original_creds = override_creds(new); |
| 79 | put_cred(new); |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | static void |
| 84 | nfs4_reset_creds(const struct cred *original) |
| 85 | { |
| 86 | revert_creds(original); |
| 87 | } |
| 88 | |
| 89 | static void |
| 90 | md5_to_hex(char *out, char *md5) |
| 91 | { |
| 92 | int i; |
| 93 | |
| 94 | for (i=0; i<16; i++) { |
| 95 | unsigned char c = md5[i]; |
| 96 | |
| 97 | *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1); |
| 98 | *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1); |
| 99 | } |
| 100 | *out = '\0'; |
| 101 | } |
| 102 | |
| 103 | static int |
| 104 | nfs4_make_rec_clidname(char *dname, const struct xdr_netobj *clname) |
| 105 | { |
| 106 | struct xdr_netobj cksum; |
| 107 | struct crypto_shash *tfm; |
| 108 | int status; |
| 109 | |
| 110 | dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n", |
| 111 | clname->len, clname->data); |
| 112 | tfm = crypto_alloc_shash("md5", 0, 0); |
| 113 | if (IS_ERR(tfm)) { |
| 114 | status = PTR_ERR(tfm); |
| 115 | goto out_no_tfm; |
| 116 | } |
| 117 | |
| 118 | cksum.len = crypto_shash_digestsize(tfm); |
| 119 | cksum.data = kmalloc(cksum.len, GFP_KERNEL); |
| 120 | if (cksum.data == NULL) { |
| 121 | status = -ENOMEM; |
| 122 | goto out; |
| 123 | } |
| 124 | |
| 125 | { |
| 126 | SHASH_DESC_ON_STACK(desc, tfm); |
| 127 | |
| 128 | desc->tfm = tfm; |
| 129 | desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP; |
| 130 | |
| 131 | status = crypto_shash_digest(desc, clname->data, clname->len, |
| 132 | cksum.data); |
| 133 | shash_desc_zero(desc); |
| 134 | } |
| 135 | |
| 136 | if (status) |
| 137 | goto out; |
| 138 | |
| 139 | md5_to_hex(dname, cksum.data); |
| 140 | |
| 141 | status = 0; |
| 142 | out: |
| 143 | kfree(cksum.data); |
| 144 | crypto_free_shash(tfm); |
| 145 | out_no_tfm: |
| 146 | return status; |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * If we had an error generating the recdir name for the legacy tracker |
| 151 | * then warn the admin. If the error doesn't appear to be transient, |
| 152 | * then disable recovery tracking. |
| 153 | */ |
| 154 | static void |
| 155 | legacy_recdir_name_error(struct nfs4_client *clp, int error) |
| 156 | { |
| 157 | printk(KERN_ERR "NFSD: unable to generate recoverydir " |
| 158 | "name (%d).\n", error); |
| 159 | |
| 160 | /* |
| 161 | * if the algorithm just doesn't exist, then disable the recovery |
| 162 | * tracker altogether. The crypto libs will generally return this if |
| 163 | * FIPS is enabled as well. |
| 164 | */ |
| 165 | if (error == -ENOENT) { |
| 166 | printk(KERN_ERR "NFSD: disabling legacy clientid tracking. " |
| 167 | "Reboot recovery will not function correctly!\n"); |
| 168 | nfsd4_client_tracking_exit(clp->net); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | static void |
| 173 | nfsd4_create_clid_dir(struct nfs4_client *clp) |
| 174 | { |
| 175 | const struct cred *original_cred; |
| 176 | char dname[HEXDIR_LEN]; |
| 177 | struct dentry *dir, *dentry; |
| 178 | struct nfs4_client_reclaim *crp; |
| 179 | int status; |
| 180 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
| 181 | |
| 182 | if (test_and_set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 183 | return; |
| 184 | if (!nn->rec_file) |
| 185 | return; |
| 186 | |
| 187 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
| 188 | if (status) |
| 189 | return legacy_recdir_name_error(clp, status); |
| 190 | |
| 191 | status = nfs4_save_creds(&original_cred); |
| 192 | if (status < 0) |
| 193 | return; |
| 194 | |
| 195 | status = mnt_want_write_file(nn->rec_file); |
| 196 | if (status) |
| 197 | goto out_creds; |
| 198 | |
| 199 | dir = nn->rec_file->f_path.dentry; |
| 200 | /* lock the parent */ |
| 201 | inode_lock(d_inode(dir)); |
| 202 | |
| 203 | dentry = lookup_one_len(dname, dir, HEXDIR_LEN-1); |
| 204 | if (IS_ERR(dentry)) { |
| 205 | status = PTR_ERR(dentry); |
| 206 | goto out_unlock; |
| 207 | } |
| 208 | if (d_really_is_positive(dentry)) |
| 209 | /* |
| 210 | * In the 4.1 case, where we're called from |
| 211 | * reclaim_complete(), records from the previous reboot |
| 212 | * may still be left, so this is OK. |
| 213 | * |
| 214 | * In the 4.0 case, we should never get here; but we may |
| 215 | * as well be forgiving and just succeed silently. |
| 216 | */ |
| 217 | goto out_put; |
| 218 | status = vfs_mkdir(d_inode(dir), dentry, S_IRWXU); |
| 219 | out_put: |
| 220 | dput(dentry); |
| 221 | out_unlock: |
| 222 | inode_unlock(d_inode(dir)); |
| 223 | if (status == 0) { |
| 224 | if (nn->in_grace) { |
| 225 | crp = nfs4_client_to_reclaim(dname, nn); |
| 226 | if (crp) |
| 227 | crp->cr_clp = clp; |
| 228 | } |
| 229 | vfs_fsync(nn->rec_file, 0); |
| 230 | } else { |
| 231 | printk(KERN_ERR "NFSD: failed to write recovery record" |
| 232 | " (err %d); please check that %s exists" |
| 233 | " and is writeable", status, |
| 234 | user_recovery_dirname); |
| 235 | } |
| 236 | mnt_drop_write_file(nn->rec_file); |
| 237 | out_creds: |
| 238 | nfs4_reset_creds(original_cred); |
| 239 | } |
| 240 | |
| 241 | typedef int (recdir_func)(struct dentry *, struct dentry *, struct nfsd_net *); |
| 242 | |
| 243 | struct name_list { |
| 244 | char name[HEXDIR_LEN]; |
| 245 | struct list_head list; |
| 246 | }; |
| 247 | |
| 248 | struct nfs4_dir_ctx { |
| 249 | struct dir_context ctx; |
| 250 | struct list_head names; |
| 251 | }; |
| 252 | |
| 253 | static int |
| 254 | nfsd4_build_namelist(struct dir_context *__ctx, const char *name, int namlen, |
| 255 | loff_t offset, u64 ino, unsigned int d_type) |
| 256 | { |
| 257 | struct nfs4_dir_ctx *ctx = |
| 258 | container_of(__ctx, struct nfs4_dir_ctx, ctx); |
| 259 | struct name_list *entry; |
| 260 | |
| 261 | if (namlen != HEXDIR_LEN - 1) |
| 262 | return 0; |
| 263 | entry = kmalloc(sizeof(struct name_list), GFP_KERNEL); |
| 264 | if (entry == NULL) |
| 265 | return -ENOMEM; |
| 266 | memcpy(entry->name, name, HEXDIR_LEN - 1); |
| 267 | entry->name[HEXDIR_LEN - 1] = '\0'; |
| 268 | list_add(&entry->list, &ctx->names); |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | static int |
| 273 | nfsd4_list_rec_dir(recdir_func *f, struct nfsd_net *nn) |
| 274 | { |
| 275 | const struct cred *original_cred; |
| 276 | struct dentry *dir = nn->rec_file->f_path.dentry; |
| 277 | struct nfs4_dir_ctx ctx = { |
| 278 | .ctx.actor = nfsd4_build_namelist, |
| 279 | .names = LIST_HEAD_INIT(ctx.names) |
| 280 | }; |
| 281 | struct name_list *entry, *tmp; |
| 282 | int status; |
| 283 | |
| 284 | status = nfs4_save_creds(&original_cred); |
| 285 | if (status < 0) |
| 286 | return status; |
| 287 | |
| 288 | status = vfs_llseek(nn->rec_file, 0, SEEK_SET); |
| 289 | if (status < 0) { |
| 290 | nfs4_reset_creds(original_cred); |
| 291 | return status; |
| 292 | } |
| 293 | |
| 294 | status = iterate_dir(nn->rec_file, &ctx.ctx); |
| 295 | inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); |
| 296 | |
| 297 | list_for_each_entry_safe(entry, tmp, &ctx.names, list) { |
| 298 | if (!status) { |
| 299 | struct dentry *dentry; |
| 300 | dentry = lookup_one_len(entry->name, dir, HEXDIR_LEN-1); |
| 301 | if (IS_ERR(dentry)) { |
| 302 | status = PTR_ERR(dentry); |
| 303 | break; |
| 304 | } |
| 305 | status = f(dir, dentry, nn); |
| 306 | dput(dentry); |
| 307 | } |
| 308 | list_del(&entry->list); |
| 309 | kfree(entry); |
| 310 | } |
| 311 | inode_unlock(d_inode(dir)); |
| 312 | nfs4_reset_creds(original_cred); |
| 313 | |
| 314 | list_for_each_entry_safe(entry, tmp, &ctx.names, list) { |
| 315 | dprintk("NFSD: %s. Left entry %s\n", __func__, entry->name); |
| 316 | list_del(&entry->list); |
| 317 | kfree(entry); |
| 318 | } |
| 319 | return status; |
| 320 | } |
| 321 | |
| 322 | static int |
| 323 | nfsd4_unlink_clid_dir(char *name, int namlen, struct nfsd_net *nn) |
| 324 | { |
| 325 | struct dentry *dir, *dentry; |
| 326 | int status; |
| 327 | |
| 328 | dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name); |
| 329 | |
| 330 | dir = nn->rec_file->f_path.dentry; |
| 331 | inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); |
| 332 | dentry = lookup_one_len(name, dir, namlen); |
| 333 | if (IS_ERR(dentry)) { |
| 334 | status = PTR_ERR(dentry); |
| 335 | goto out_unlock; |
| 336 | } |
| 337 | status = -ENOENT; |
| 338 | if (d_really_is_negative(dentry)) |
| 339 | goto out; |
| 340 | status = vfs_rmdir(d_inode(dir), dentry); |
| 341 | out: |
| 342 | dput(dentry); |
| 343 | out_unlock: |
| 344 | inode_unlock(d_inode(dir)); |
| 345 | return status; |
| 346 | } |
| 347 | |
| 348 | static void |
| 349 | nfsd4_remove_clid_dir(struct nfs4_client *clp) |
| 350 | { |
| 351 | const struct cred *original_cred; |
| 352 | struct nfs4_client_reclaim *crp; |
| 353 | char dname[HEXDIR_LEN]; |
| 354 | int status; |
| 355 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
| 356 | |
| 357 | if (!nn->rec_file || !test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 358 | return; |
| 359 | |
| 360 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
| 361 | if (status) |
| 362 | return legacy_recdir_name_error(clp, status); |
| 363 | |
| 364 | status = mnt_want_write_file(nn->rec_file); |
| 365 | if (status) |
| 366 | goto out; |
| 367 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 368 | |
| 369 | status = nfs4_save_creds(&original_cred); |
| 370 | if (status < 0) |
| 371 | goto out_drop_write; |
| 372 | |
| 373 | status = nfsd4_unlink_clid_dir(dname, HEXDIR_LEN-1, nn); |
| 374 | nfs4_reset_creds(original_cred); |
| 375 | if (status == 0) { |
| 376 | vfs_fsync(nn->rec_file, 0); |
| 377 | if (nn->in_grace) { |
| 378 | /* remove reclaim record */ |
| 379 | crp = nfsd4_find_reclaim_client(dname, nn); |
| 380 | if (crp) |
| 381 | nfs4_remove_reclaim_record(crp, nn); |
| 382 | } |
| 383 | } |
| 384 | out_drop_write: |
| 385 | mnt_drop_write_file(nn->rec_file); |
| 386 | out: |
| 387 | if (status) |
| 388 | printk("NFSD: Failed to remove expired client state directory" |
| 389 | " %.*s\n", HEXDIR_LEN, dname); |
| 390 | } |
| 391 | |
| 392 | static int |
| 393 | purge_old(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
| 394 | { |
| 395 | int status; |
| 396 | |
| 397 | if (nfs4_has_reclaimed_state(child->d_name.name, nn)) |
| 398 | return 0; |
| 399 | |
| 400 | status = vfs_rmdir(d_inode(parent), child); |
| 401 | if (status) |
| 402 | printk("failed to remove client recovery directory %pd\n", |
| 403 | child); |
| 404 | /* Keep trying, success or failure: */ |
| 405 | return 0; |
| 406 | } |
| 407 | |
| 408 | static void |
| 409 | nfsd4_recdir_purge_old(struct nfsd_net *nn) |
| 410 | { |
| 411 | int status; |
| 412 | |
| 413 | nn->in_grace = false; |
| 414 | if (!nn->rec_file) |
| 415 | return; |
| 416 | status = mnt_want_write_file(nn->rec_file); |
| 417 | if (status) |
| 418 | goto out; |
| 419 | status = nfsd4_list_rec_dir(purge_old, nn); |
| 420 | if (status == 0) |
| 421 | vfs_fsync(nn->rec_file, 0); |
| 422 | mnt_drop_write_file(nn->rec_file); |
| 423 | out: |
| 424 | nfs4_release_reclaim(nn); |
| 425 | if (status) |
| 426 | printk("nfsd4: failed to purge old clients from recovery" |
| 427 | " directory %pD\n", nn->rec_file); |
| 428 | } |
| 429 | |
| 430 | static int |
| 431 | load_recdir(struct dentry *parent, struct dentry *child, struct nfsd_net *nn) |
| 432 | { |
| 433 | if (child->d_name.len != HEXDIR_LEN - 1) { |
| 434 | printk("nfsd4: illegal name %pd in recovery directory\n", |
| 435 | child); |
| 436 | /* Keep trying; maybe the others are OK: */ |
| 437 | return 0; |
| 438 | } |
| 439 | nfs4_client_to_reclaim(child->d_name.name, nn); |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | static int |
| 444 | nfsd4_recdir_load(struct net *net) { |
| 445 | int status; |
| 446 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 447 | |
| 448 | if (!nn->rec_file) |
| 449 | return 0; |
| 450 | |
| 451 | status = nfsd4_list_rec_dir(load_recdir, nn); |
| 452 | if (status) |
| 453 | printk("nfsd4: failed loading clients from recovery" |
| 454 | " directory %pD\n", nn->rec_file); |
| 455 | return status; |
| 456 | } |
| 457 | |
| 458 | /* |
| 459 | * Hold reference to the recovery directory. |
| 460 | */ |
| 461 | |
| 462 | static int |
| 463 | nfsd4_init_recdir(struct net *net) |
| 464 | { |
| 465 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 466 | const struct cred *original_cred; |
| 467 | int status; |
| 468 | |
| 469 | printk("NFSD: Using %s as the NFSv4 state recovery directory\n", |
| 470 | user_recovery_dirname); |
| 471 | |
| 472 | BUG_ON(nn->rec_file); |
| 473 | |
| 474 | status = nfs4_save_creds(&original_cred); |
| 475 | if (status < 0) { |
| 476 | printk("NFSD: Unable to change credentials to find recovery" |
| 477 | " directory: error %d\n", |
| 478 | status); |
| 479 | return status; |
| 480 | } |
| 481 | |
| 482 | nn->rec_file = filp_open(user_recovery_dirname, O_RDONLY | O_DIRECTORY, 0); |
| 483 | if (IS_ERR(nn->rec_file)) { |
| 484 | printk("NFSD: unable to find recovery directory %s\n", |
| 485 | user_recovery_dirname); |
| 486 | status = PTR_ERR(nn->rec_file); |
| 487 | nn->rec_file = NULL; |
| 488 | } |
| 489 | |
| 490 | nfs4_reset_creds(original_cred); |
| 491 | if (!status) |
| 492 | nn->in_grace = true; |
| 493 | return status; |
| 494 | } |
| 495 | |
| 496 | static void |
| 497 | nfsd4_shutdown_recdir(struct net *net) |
| 498 | { |
| 499 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 500 | |
| 501 | if (!nn->rec_file) |
| 502 | return; |
| 503 | fput(nn->rec_file); |
| 504 | nn->rec_file = NULL; |
| 505 | } |
| 506 | |
| 507 | static int |
| 508 | nfs4_legacy_state_init(struct net *net) |
| 509 | { |
| 510 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 511 | int i; |
| 512 | |
| 513 | nn->reclaim_str_hashtbl = kmalloc(sizeof(struct list_head) * |
| 514 | CLIENT_HASH_SIZE, GFP_KERNEL); |
| 515 | if (!nn->reclaim_str_hashtbl) |
| 516 | return -ENOMEM; |
| 517 | |
| 518 | for (i = 0; i < CLIENT_HASH_SIZE; i++) |
| 519 | INIT_LIST_HEAD(&nn->reclaim_str_hashtbl[i]); |
| 520 | nn->reclaim_str_hashtbl_size = 0; |
| 521 | |
| 522 | return 0; |
| 523 | } |
| 524 | |
| 525 | static void |
| 526 | nfs4_legacy_state_shutdown(struct net *net) |
| 527 | { |
| 528 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 529 | |
| 530 | kfree(nn->reclaim_str_hashtbl); |
| 531 | } |
| 532 | |
| 533 | static int |
| 534 | nfsd4_load_reboot_recovery_data(struct net *net) |
| 535 | { |
| 536 | int status; |
| 537 | |
| 538 | status = nfsd4_init_recdir(net); |
| 539 | if (status) |
| 540 | return status; |
| 541 | |
| 542 | status = nfsd4_recdir_load(net); |
| 543 | if (status) |
| 544 | nfsd4_shutdown_recdir(net); |
| 545 | |
| 546 | return status; |
| 547 | } |
| 548 | |
| 549 | static int |
| 550 | nfsd4_legacy_tracking_init(struct net *net) |
| 551 | { |
| 552 | int status; |
| 553 | |
| 554 | /* XXX: The legacy code won't work in a container */ |
| 555 | if (net != &init_net) { |
| 556 | pr_warn("NFSD: attempt to initialize legacy client tracking in a container ignored.\n"); |
| 557 | return -EINVAL; |
| 558 | } |
| 559 | |
| 560 | status = nfs4_legacy_state_init(net); |
| 561 | if (status) |
| 562 | return status; |
| 563 | |
| 564 | status = nfsd4_load_reboot_recovery_data(net); |
| 565 | if (status) |
| 566 | goto err; |
| 567 | return 0; |
| 568 | |
| 569 | err: |
| 570 | nfs4_legacy_state_shutdown(net); |
| 571 | return status; |
| 572 | } |
| 573 | |
| 574 | static void |
| 575 | nfsd4_legacy_tracking_exit(struct net *net) |
| 576 | { |
| 577 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 578 | |
| 579 | nfs4_release_reclaim(nn); |
| 580 | nfsd4_shutdown_recdir(net); |
| 581 | nfs4_legacy_state_shutdown(net); |
| 582 | } |
| 583 | |
| 584 | /* |
| 585 | * Change the NFSv4 recovery directory to recdir. |
| 586 | */ |
| 587 | int |
| 588 | nfs4_reset_recoverydir(char *recdir) |
| 589 | { |
| 590 | int status; |
| 591 | struct path path; |
| 592 | |
| 593 | status = kern_path(recdir, LOOKUP_FOLLOW, &path); |
| 594 | if (status) |
| 595 | return status; |
| 596 | status = -ENOTDIR; |
| 597 | if (d_is_dir(path.dentry)) { |
| 598 | strcpy(user_recovery_dirname, recdir); |
| 599 | status = 0; |
| 600 | } |
| 601 | path_put(&path); |
| 602 | return status; |
| 603 | } |
| 604 | |
| 605 | char * |
| 606 | nfs4_recoverydir(void) |
| 607 | { |
| 608 | return user_recovery_dirname; |
| 609 | } |
| 610 | |
| 611 | static int |
| 612 | nfsd4_check_legacy_client(struct nfs4_client *clp) |
| 613 | { |
| 614 | int status; |
| 615 | char dname[HEXDIR_LEN]; |
| 616 | struct nfs4_client_reclaim *crp; |
| 617 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
| 618 | |
| 619 | /* did we already find that this client is stable? */ |
| 620 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 621 | return 0; |
| 622 | |
| 623 | status = nfs4_make_rec_clidname(dname, &clp->cl_name); |
| 624 | if (status) { |
| 625 | legacy_recdir_name_error(clp, status); |
| 626 | return status; |
| 627 | } |
| 628 | |
| 629 | /* look for it in the reclaim hashtable otherwise */ |
| 630 | crp = nfsd4_find_reclaim_client(dname, nn); |
| 631 | if (crp) { |
| 632 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 633 | crp->cr_clp = clp; |
| 634 | return 0; |
| 635 | } |
| 636 | |
| 637 | return -ENOENT; |
| 638 | } |
| 639 | |
| 640 | static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = { |
| 641 | .init = nfsd4_legacy_tracking_init, |
| 642 | .exit = nfsd4_legacy_tracking_exit, |
| 643 | .create = nfsd4_create_clid_dir, |
| 644 | .remove = nfsd4_remove_clid_dir, |
| 645 | .check = nfsd4_check_legacy_client, |
| 646 | .grace_done = nfsd4_recdir_purge_old, |
| 647 | }; |
| 648 | |
| 649 | /* Globals */ |
| 650 | #define NFSD_PIPE_DIR "nfsd" |
| 651 | #define NFSD_CLD_PIPE "cld" |
| 652 | |
| 653 | /* per-net-ns structure for holding cld upcall info */ |
| 654 | struct cld_net { |
| 655 | struct rpc_pipe *cn_pipe; |
| 656 | spinlock_t cn_lock; |
| 657 | struct list_head cn_list; |
| 658 | unsigned int cn_xid; |
| 659 | }; |
| 660 | |
| 661 | struct cld_upcall { |
| 662 | struct list_head cu_list; |
| 663 | struct cld_net *cu_net; |
| 664 | struct task_struct *cu_task; |
| 665 | struct cld_msg cu_msg; |
| 666 | }; |
| 667 | |
| 668 | static int |
| 669 | __cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) |
| 670 | { |
| 671 | int ret; |
| 672 | struct rpc_pipe_msg msg; |
| 673 | |
| 674 | memset(&msg, 0, sizeof(msg)); |
| 675 | msg.data = cmsg; |
| 676 | msg.len = sizeof(*cmsg); |
| 677 | |
| 678 | /* |
| 679 | * Set task state before we queue the upcall. That prevents |
| 680 | * wake_up_process in the downcall from racing with schedule. |
| 681 | */ |
| 682 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 683 | ret = rpc_queue_upcall(pipe, &msg); |
| 684 | if (ret < 0) { |
| 685 | set_current_state(TASK_RUNNING); |
| 686 | goto out; |
| 687 | } |
| 688 | |
| 689 | schedule(); |
| 690 | |
| 691 | if (msg.errno < 0) |
| 692 | ret = msg.errno; |
| 693 | out: |
| 694 | return ret; |
| 695 | } |
| 696 | |
| 697 | static int |
| 698 | cld_pipe_upcall(struct rpc_pipe *pipe, struct cld_msg *cmsg) |
| 699 | { |
| 700 | int ret; |
| 701 | |
| 702 | /* |
| 703 | * -EAGAIN occurs when pipe is closed and reopened while there are |
| 704 | * upcalls queued. |
| 705 | */ |
| 706 | do { |
| 707 | ret = __cld_pipe_upcall(pipe, cmsg); |
| 708 | } while (ret == -EAGAIN); |
| 709 | |
| 710 | return ret; |
| 711 | } |
| 712 | |
| 713 | static ssize_t |
| 714 | cld_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) |
| 715 | { |
| 716 | struct cld_upcall *tmp, *cup; |
| 717 | struct cld_msg __user *cmsg = (struct cld_msg __user *)src; |
| 718 | uint32_t xid; |
| 719 | struct nfsd_net *nn = net_generic(file_inode(filp)->i_sb->s_fs_info, |
| 720 | nfsd_net_id); |
| 721 | struct cld_net *cn = nn->cld_net; |
| 722 | |
| 723 | if (mlen != sizeof(*cmsg)) { |
| 724 | dprintk("%s: got %zu bytes, expected %zu\n", __func__, mlen, |
| 725 | sizeof(*cmsg)); |
| 726 | return -EINVAL; |
| 727 | } |
| 728 | |
| 729 | /* copy just the xid so we can try to find that */ |
| 730 | if (copy_from_user(&xid, &cmsg->cm_xid, sizeof(xid)) != 0) { |
| 731 | dprintk("%s: error when copying xid from userspace", __func__); |
| 732 | return -EFAULT; |
| 733 | } |
| 734 | |
| 735 | /* walk the list and find corresponding xid */ |
| 736 | cup = NULL; |
| 737 | spin_lock(&cn->cn_lock); |
| 738 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { |
| 739 | if (get_unaligned(&tmp->cu_msg.cm_xid) == xid) { |
| 740 | cup = tmp; |
| 741 | list_del_init(&cup->cu_list); |
| 742 | break; |
| 743 | } |
| 744 | } |
| 745 | spin_unlock(&cn->cn_lock); |
| 746 | |
| 747 | /* couldn't find upcall? */ |
| 748 | if (!cup) { |
| 749 | dprintk("%s: couldn't find upcall -- xid=%u\n", __func__, xid); |
| 750 | return -EINVAL; |
| 751 | } |
| 752 | |
| 753 | if (copy_from_user(&cup->cu_msg, src, mlen) != 0) |
| 754 | return -EFAULT; |
| 755 | |
| 756 | wake_up_process(cup->cu_task); |
| 757 | return mlen; |
| 758 | } |
| 759 | |
| 760 | static void |
| 761 | cld_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
| 762 | { |
| 763 | struct cld_msg *cmsg = msg->data; |
| 764 | struct cld_upcall *cup = container_of(cmsg, struct cld_upcall, |
| 765 | cu_msg); |
| 766 | |
| 767 | /* errno >= 0 means we got a downcall */ |
| 768 | if (msg->errno >= 0) |
| 769 | return; |
| 770 | |
| 771 | wake_up_process(cup->cu_task); |
| 772 | } |
| 773 | |
| 774 | static const struct rpc_pipe_ops cld_upcall_ops = { |
| 775 | .upcall = rpc_pipe_generic_upcall, |
| 776 | .downcall = cld_pipe_downcall, |
| 777 | .destroy_msg = cld_pipe_destroy_msg, |
| 778 | }; |
| 779 | |
| 780 | static struct dentry * |
| 781 | nfsd4_cld_register_sb(struct super_block *sb, struct rpc_pipe *pipe) |
| 782 | { |
| 783 | struct dentry *dir, *dentry; |
| 784 | |
| 785 | dir = rpc_d_lookup_sb(sb, NFSD_PIPE_DIR); |
| 786 | if (dir == NULL) |
| 787 | return ERR_PTR(-ENOENT); |
| 788 | dentry = rpc_mkpipe_dentry(dir, NFSD_CLD_PIPE, NULL, pipe); |
| 789 | dput(dir); |
| 790 | return dentry; |
| 791 | } |
| 792 | |
| 793 | static void |
| 794 | nfsd4_cld_unregister_sb(struct rpc_pipe *pipe) |
| 795 | { |
| 796 | if (pipe->dentry) |
| 797 | rpc_unlink(pipe->dentry); |
| 798 | } |
| 799 | |
| 800 | static struct dentry * |
| 801 | nfsd4_cld_register_net(struct net *net, struct rpc_pipe *pipe) |
| 802 | { |
| 803 | struct super_block *sb; |
| 804 | struct dentry *dentry; |
| 805 | |
| 806 | sb = rpc_get_sb_net(net); |
| 807 | if (!sb) |
| 808 | return NULL; |
| 809 | dentry = nfsd4_cld_register_sb(sb, pipe); |
| 810 | rpc_put_sb_net(net); |
| 811 | return dentry; |
| 812 | } |
| 813 | |
| 814 | static void |
| 815 | nfsd4_cld_unregister_net(struct net *net, struct rpc_pipe *pipe) |
| 816 | { |
| 817 | struct super_block *sb; |
| 818 | |
| 819 | sb = rpc_get_sb_net(net); |
| 820 | if (sb) { |
| 821 | nfsd4_cld_unregister_sb(pipe); |
| 822 | rpc_put_sb_net(net); |
| 823 | } |
| 824 | } |
| 825 | |
| 826 | /* Initialize rpc_pipefs pipe for communication with client tracking daemon */ |
| 827 | static int |
| 828 | nfsd4_init_cld_pipe(struct net *net) |
| 829 | { |
| 830 | int ret; |
| 831 | struct dentry *dentry; |
| 832 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 833 | struct cld_net *cn; |
| 834 | |
| 835 | if (nn->cld_net) |
| 836 | return 0; |
| 837 | |
| 838 | cn = kzalloc(sizeof(*cn), GFP_KERNEL); |
| 839 | if (!cn) { |
| 840 | ret = -ENOMEM; |
| 841 | goto err; |
| 842 | } |
| 843 | |
| 844 | cn->cn_pipe = rpc_mkpipe_data(&cld_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); |
| 845 | if (IS_ERR(cn->cn_pipe)) { |
| 846 | ret = PTR_ERR(cn->cn_pipe); |
| 847 | goto err; |
| 848 | } |
| 849 | spin_lock_init(&cn->cn_lock); |
| 850 | INIT_LIST_HEAD(&cn->cn_list); |
| 851 | |
| 852 | dentry = nfsd4_cld_register_net(net, cn->cn_pipe); |
| 853 | if (IS_ERR(dentry)) { |
| 854 | ret = PTR_ERR(dentry); |
| 855 | goto err_destroy_data; |
| 856 | } |
| 857 | |
| 858 | cn->cn_pipe->dentry = dentry; |
| 859 | nn->cld_net = cn; |
| 860 | return 0; |
| 861 | |
| 862 | err_destroy_data: |
| 863 | rpc_destroy_pipe_data(cn->cn_pipe); |
| 864 | err: |
| 865 | kfree(cn); |
| 866 | printk(KERN_ERR "NFSD: unable to create nfsdcld upcall pipe (%d)\n", |
| 867 | ret); |
| 868 | return ret; |
| 869 | } |
| 870 | |
| 871 | static void |
| 872 | nfsd4_remove_cld_pipe(struct net *net) |
| 873 | { |
| 874 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 875 | struct cld_net *cn = nn->cld_net; |
| 876 | |
| 877 | nfsd4_cld_unregister_net(net, cn->cn_pipe); |
| 878 | rpc_destroy_pipe_data(cn->cn_pipe); |
| 879 | kfree(nn->cld_net); |
| 880 | nn->cld_net = NULL; |
| 881 | } |
| 882 | |
| 883 | static struct cld_upcall * |
| 884 | alloc_cld_upcall(struct cld_net *cn) |
| 885 | { |
| 886 | struct cld_upcall *new, *tmp; |
| 887 | |
| 888 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
| 889 | if (!new) |
| 890 | return new; |
| 891 | |
| 892 | /* FIXME: hard cap on number in flight? */ |
| 893 | restart_search: |
| 894 | spin_lock(&cn->cn_lock); |
| 895 | list_for_each_entry(tmp, &cn->cn_list, cu_list) { |
| 896 | if (tmp->cu_msg.cm_xid == cn->cn_xid) { |
| 897 | cn->cn_xid++; |
| 898 | spin_unlock(&cn->cn_lock); |
| 899 | goto restart_search; |
| 900 | } |
| 901 | } |
| 902 | new->cu_task = current; |
| 903 | new->cu_msg.cm_vers = CLD_UPCALL_VERSION; |
| 904 | put_unaligned(cn->cn_xid++, &new->cu_msg.cm_xid); |
| 905 | new->cu_net = cn; |
| 906 | list_add(&new->cu_list, &cn->cn_list); |
| 907 | spin_unlock(&cn->cn_lock); |
| 908 | |
| 909 | dprintk("%s: allocated xid %u\n", __func__, new->cu_msg.cm_xid); |
| 910 | |
| 911 | return new; |
| 912 | } |
| 913 | |
| 914 | static void |
| 915 | free_cld_upcall(struct cld_upcall *victim) |
| 916 | { |
| 917 | struct cld_net *cn = victim->cu_net; |
| 918 | |
| 919 | spin_lock(&cn->cn_lock); |
| 920 | list_del(&victim->cu_list); |
| 921 | spin_unlock(&cn->cn_lock); |
| 922 | kfree(victim); |
| 923 | } |
| 924 | |
| 925 | /* Ask daemon to create a new record */ |
| 926 | static void |
| 927 | nfsd4_cld_create(struct nfs4_client *clp) |
| 928 | { |
| 929 | int ret; |
| 930 | struct cld_upcall *cup; |
| 931 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
| 932 | struct cld_net *cn = nn->cld_net; |
| 933 | |
| 934 | /* Don't upcall if it's already stored */ |
| 935 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 936 | return; |
| 937 | |
| 938 | cup = alloc_cld_upcall(cn); |
| 939 | if (!cup) { |
| 940 | ret = -ENOMEM; |
| 941 | goto out_err; |
| 942 | } |
| 943 | |
| 944 | cup->cu_msg.cm_cmd = Cld_Create; |
| 945 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; |
| 946 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, |
| 947 | clp->cl_name.len); |
| 948 | |
| 949 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); |
| 950 | if (!ret) { |
| 951 | ret = cup->cu_msg.cm_status; |
| 952 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 953 | } |
| 954 | |
| 955 | free_cld_upcall(cup); |
| 956 | out_err: |
| 957 | if (ret) |
| 958 | printk(KERN_ERR "NFSD: Unable to create client " |
| 959 | "record on stable storage: %d\n", ret); |
| 960 | } |
| 961 | |
| 962 | /* Ask daemon to create a new record */ |
| 963 | static void |
| 964 | nfsd4_cld_remove(struct nfs4_client *clp) |
| 965 | { |
| 966 | int ret; |
| 967 | struct cld_upcall *cup; |
| 968 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
| 969 | struct cld_net *cn = nn->cld_net; |
| 970 | |
| 971 | /* Don't upcall if it's already removed */ |
| 972 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 973 | return; |
| 974 | |
| 975 | cup = alloc_cld_upcall(cn); |
| 976 | if (!cup) { |
| 977 | ret = -ENOMEM; |
| 978 | goto out_err; |
| 979 | } |
| 980 | |
| 981 | cup->cu_msg.cm_cmd = Cld_Remove; |
| 982 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; |
| 983 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, |
| 984 | clp->cl_name.len); |
| 985 | |
| 986 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); |
| 987 | if (!ret) { |
| 988 | ret = cup->cu_msg.cm_status; |
| 989 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 990 | } |
| 991 | |
| 992 | free_cld_upcall(cup); |
| 993 | out_err: |
| 994 | if (ret) |
| 995 | printk(KERN_ERR "NFSD: Unable to remove client " |
| 996 | "record from stable storage: %d\n", ret); |
| 997 | } |
| 998 | |
| 999 | /* Check for presence of a record, and update its timestamp */ |
| 1000 | static int |
| 1001 | nfsd4_cld_check(struct nfs4_client *clp) |
| 1002 | { |
| 1003 | int ret; |
| 1004 | struct cld_upcall *cup; |
| 1005 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
| 1006 | struct cld_net *cn = nn->cld_net; |
| 1007 | |
| 1008 | /* Don't upcall if one was already stored during this grace pd */ |
| 1009 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 1010 | return 0; |
| 1011 | |
| 1012 | cup = alloc_cld_upcall(cn); |
| 1013 | if (!cup) { |
| 1014 | printk(KERN_ERR "NFSD: Unable to check client record on " |
| 1015 | "stable storage: %d\n", -ENOMEM); |
| 1016 | return -ENOMEM; |
| 1017 | } |
| 1018 | |
| 1019 | cup->cu_msg.cm_cmd = Cld_Check; |
| 1020 | cup->cu_msg.cm_u.cm_name.cn_len = clp->cl_name.len; |
| 1021 | memcpy(cup->cu_msg.cm_u.cm_name.cn_id, clp->cl_name.data, |
| 1022 | clp->cl_name.len); |
| 1023 | |
| 1024 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); |
| 1025 | if (!ret) { |
| 1026 | ret = cup->cu_msg.cm_status; |
| 1027 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 1028 | } |
| 1029 | |
| 1030 | free_cld_upcall(cup); |
| 1031 | return ret; |
| 1032 | } |
| 1033 | |
| 1034 | static void |
| 1035 | nfsd4_cld_grace_done(struct nfsd_net *nn) |
| 1036 | { |
| 1037 | int ret; |
| 1038 | struct cld_upcall *cup; |
| 1039 | struct cld_net *cn = nn->cld_net; |
| 1040 | |
| 1041 | cup = alloc_cld_upcall(cn); |
| 1042 | if (!cup) { |
| 1043 | ret = -ENOMEM; |
| 1044 | goto out_err; |
| 1045 | } |
| 1046 | |
| 1047 | cup->cu_msg.cm_cmd = Cld_GraceDone; |
| 1048 | cup->cu_msg.cm_u.cm_gracetime = (int64_t)nn->boot_time; |
| 1049 | ret = cld_pipe_upcall(cn->cn_pipe, &cup->cu_msg); |
| 1050 | if (!ret) |
| 1051 | ret = cup->cu_msg.cm_status; |
| 1052 | |
| 1053 | free_cld_upcall(cup); |
| 1054 | out_err: |
| 1055 | if (ret) |
| 1056 | printk(KERN_ERR "NFSD: Unable to end grace period: %d\n", ret); |
| 1057 | } |
| 1058 | |
| 1059 | static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops = { |
| 1060 | .init = nfsd4_init_cld_pipe, |
| 1061 | .exit = nfsd4_remove_cld_pipe, |
| 1062 | .create = nfsd4_cld_create, |
| 1063 | .remove = nfsd4_cld_remove, |
| 1064 | .check = nfsd4_cld_check, |
| 1065 | .grace_done = nfsd4_cld_grace_done, |
| 1066 | }; |
| 1067 | |
| 1068 | /* upcall via usermodehelper */ |
| 1069 | static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack"; |
| 1070 | module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog), |
| 1071 | S_IRUGO|S_IWUSR); |
| 1072 | MODULE_PARM_DESC(cltrack_prog, "Path to the nfsdcltrack upcall program"); |
| 1073 | |
| 1074 | static bool cltrack_legacy_disable; |
| 1075 | module_param(cltrack_legacy_disable, bool, S_IRUGO|S_IWUSR); |
| 1076 | MODULE_PARM_DESC(cltrack_legacy_disable, |
| 1077 | "Disable legacy recoverydir conversion. Default: false"); |
| 1078 | |
| 1079 | #define LEGACY_TOPDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_TOPDIR=" |
| 1080 | #define LEGACY_RECDIR_ENV_PREFIX "NFSDCLTRACK_LEGACY_RECDIR=" |
| 1081 | #define HAS_SESSION_ENV_PREFIX "NFSDCLTRACK_CLIENT_HAS_SESSION=" |
| 1082 | #define GRACE_START_ENV_PREFIX "NFSDCLTRACK_GRACE_START=" |
| 1083 | |
| 1084 | static char * |
| 1085 | nfsd4_cltrack_legacy_topdir(void) |
| 1086 | { |
| 1087 | int copied; |
| 1088 | size_t len; |
| 1089 | char *result; |
| 1090 | |
| 1091 | if (cltrack_legacy_disable) |
| 1092 | return NULL; |
| 1093 | |
| 1094 | len = strlen(LEGACY_TOPDIR_ENV_PREFIX) + |
| 1095 | strlen(nfs4_recoverydir()) + 1; |
| 1096 | |
| 1097 | result = kmalloc(len, GFP_KERNEL); |
| 1098 | if (!result) |
| 1099 | return result; |
| 1100 | |
| 1101 | copied = snprintf(result, len, LEGACY_TOPDIR_ENV_PREFIX "%s", |
| 1102 | nfs4_recoverydir()); |
| 1103 | if (copied >= len) { |
| 1104 | /* just return nothing if output was truncated */ |
| 1105 | kfree(result); |
| 1106 | return NULL; |
| 1107 | } |
| 1108 | |
| 1109 | return result; |
| 1110 | } |
| 1111 | |
| 1112 | static char * |
| 1113 | nfsd4_cltrack_legacy_recdir(const struct xdr_netobj *name) |
| 1114 | { |
| 1115 | int copied; |
| 1116 | size_t len; |
| 1117 | char *result; |
| 1118 | |
| 1119 | if (cltrack_legacy_disable) |
| 1120 | return NULL; |
| 1121 | |
| 1122 | /* +1 is for '/' between "topdir" and "recdir" */ |
| 1123 | len = strlen(LEGACY_RECDIR_ENV_PREFIX) + |
| 1124 | strlen(nfs4_recoverydir()) + 1 + HEXDIR_LEN; |
| 1125 | |
| 1126 | result = kmalloc(len, GFP_KERNEL); |
| 1127 | if (!result) |
| 1128 | return result; |
| 1129 | |
| 1130 | copied = snprintf(result, len, LEGACY_RECDIR_ENV_PREFIX "%s/", |
| 1131 | nfs4_recoverydir()); |
| 1132 | if (copied > (len - HEXDIR_LEN)) { |
| 1133 | /* just return nothing if output will be truncated */ |
| 1134 | kfree(result); |
| 1135 | return NULL; |
| 1136 | } |
| 1137 | |
| 1138 | copied = nfs4_make_rec_clidname(result + copied, name); |
| 1139 | if (copied) { |
| 1140 | kfree(result); |
| 1141 | return NULL; |
| 1142 | } |
| 1143 | |
| 1144 | return result; |
| 1145 | } |
| 1146 | |
| 1147 | static char * |
| 1148 | nfsd4_cltrack_client_has_session(struct nfs4_client *clp) |
| 1149 | { |
| 1150 | int copied; |
| 1151 | size_t len; |
| 1152 | char *result; |
| 1153 | |
| 1154 | /* prefix + Y/N character + terminating NULL */ |
| 1155 | len = strlen(HAS_SESSION_ENV_PREFIX) + 1 + 1; |
| 1156 | |
| 1157 | result = kmalloc(len, GFP_KERNEL); |
| 1158 | if (!result) |
| 1159 | return result; |
| 1160 | |
| 1161 | copied = snprintf(result, len, HAS_SESSION_ENV_PREFIX "%c", |
| 1162 | clp->cl_minorversion ? 'Y' : 'N'); |
| 1163 | if (copied >= len) { |
| 1164 | /* just return nothing if output was truncated */ |
| 1165 | kfree(result); |
| 1166 | return NULL; |
| 1167 | } |
| 1168 | |
| 1169 | return result; |
| 1170 | } |
| 1171 | |
| 1172 | static char * |
| 1173 | nfsd4_cltrack_grace_start(time_t grace_start) |
| 1174 | { |
| 1175 | int copied; |
| 1176 | size_t len; |
| 1177 | char *result; |
| 1178 | |
| 1179 | /* prefix + max width of int64_t string + terminating NULL */ |
| 1180 | len = strlen(GRACE_START_ENV_PREFIX) + 22 + 1; |
| 1181 | |
| 1182 | result = kmalloc(len, GFP_KERNEL); |
| 1183 | if (!result) |
| 1184 | return result; |
| 1185 | |
| 1186 | copied = snprintf(result, len, GRACE_START_ENV_PREFIX "%ld", |
| 1187 | grace_start); |
| 1188 | if (copied >= len) { |
| 1189 | /* just return nothing if output was truncated */ |
| 1190 | kfree(result); |
| 1191 | return NULL; |
| 1192 | } |
| 1193 | |
| 1194 | return result; |
| 1195 | } |
| 1196 | |
| 1197 | static int |
| 1198 | nfsd4_umh_cltrack_upcall(char *cmd, char *arg, char *env0, char *env1) |
| 1199 | { |
| 1200 | char *envp[3]; |
| 1201 | char *argv[4]; |
| 1202 | int ret; |
| 1203 | |
| 1204 | if (unlikely(!cltrack_prog[0])) { |
| 1205 | dprintk("%s: cltrack_prog is disabled\n", __func__); |
| 1206 | return -EACCES; |
| 1207 | } |
| 1208 | |
| 1209 | dprintk("%s: cmd: %s\n", __func__, cmd); |
| 1210 | dprintk("%s: arg: %s\n", __func__, arg ? arg : "(null)"); |
| 1211 | dprintk("%s: env0: %s\n", __func__, env0 ? env0 : "(null)"); |
| 1212 | dprintk("%s: env1: %s\n", __func__, env1 ? env1 : "(null)"); |
| 1213 | |
| 1214 | envp[0] = env0; |
| 1215 | envp[1] = env1; |
| 1216 | envp[2] = NULL; |
| 1217 | |
| 1218 | argv[0] = (char *)cltrack_prog; |
| 1219 | argv[1] = cmd; |
| 1220 | argv[2] = arg; |
| 1221 | argv[3] = NULL; |
| 1222 | |
| 1223 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); |
| 1224 | /* |
| 1225 | * Disable the upcall mechanism if we're getting an ENOENT or EACCES |
| 1226 | * error. The admin can re-enable it on the fly by using sysfs |
| 1227 | * once the problem has been fixed. |
| 1228 | */ |
| 1229 | if (ret == -ENOENT || ret == -EACCES) { |
| 1230 | dprintk("NFSD: %s was not found or isn't executable (%d). " |
| 1231 | "Setting cltrack_prog to blank string!", |
| 1232 | cltrack_prog, ret); |
| 1233 | cltrack_prog[0] = '\0'; |
| 1234 | } |
| 1235 | dprintk("%s: %s return value: %d\n", __func__, cltrack_prog, ret); |
| 1236 | |
| 1237 | return ret; |
| 1238 | } |
| 1239 | |
| 1240 | static char * |
| 1241 | bin_to_hex_dup(const unsigned char *src, int srclen) |
| 1242 | { |
| 1243 | int i; |
| 1244 | char *buf, *hex; |
| 1245 | |
| 1246 | /* +1 for terminating NULL */ |
| 1247 | buf = kmalloc((srclen * 2) + 1, GFP_KERNEL); |
| 1248 | if (!buf) |
| 1249 | return buf; |
| 1250 | |
| 1251 | hex = buf; |
| 1252 | for (i = 0; i < srclen; i++) { |
| 1253 | sprintf(hex, "%2.2x", *src++); |
| 1254 | hex += 2; |
| 1255 | } |
| 1256 | return buf; |
| 1257 | } |
| 1258 | |
| 1259 | static int |
| 1260 | nfsd4_umh_cltrack_init(struct net *net) |
| 1261 | { |
| 1262 | int ret; |
| 1263 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 1264 | char *grace_start = nfsd4_cltrack_grace_start(nn->boot_time); |
| 1265 | |
| 1266 | /* XXX: The usermode helper s not working in container yet. */ |
| 1267 | if (net != &init_net) { |
| 1268 | pr_warn("NFSD: attempt to initialize umh client tracking in a container ignored.\n"); |
| 1269 | kfree(grace_start); |
| 1270 | return -EINVAL; |
| 1271 | } |
| 1272 | |
| 1273 | ret = nfsd4_umh_cltrack_upcall("init", NULL, grace_start, NULL); |
| 1274 | kfree(grace_start); |
| 1275 | return ret; |
| 1276 | } |
| 1277 | |
| 1278 | static void |
| 1279 | nfsd4_cltrack_upcall_lock(struct nfs4_client *clp) |
| 1280 | { |
| 1281 | wait_on_bit_lock(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK, |
| 1282 | TASK_UNINTERRUPTIBLE); |
| 1283 | } |
| 1284 | |
| 1285 | static void |
| 1286 | nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp) |
| 1287 | { |
| 1288 | smp_mb__before_atomic(); |
| 1289 | clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags); |
| 1290 | smp_mb__after_atomic(); |
| 1291 | wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK); |
| 1292 | } |
| 1293 | |
| 1294 | static void |
| 1295 | nfsd4_umh_cltrack_create(struct nfs4_client *clp) |
| 1296 | { |
| 1297 | char *hexid, *has_session, *grace_start; |
| 1298 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
| 1299 | |
| 1300 | /* |
| 1301 | * With v4.0 clients, there's little difference in outcome between a |
| 1302 | * create and check operation, and we can end up calling into this |
| 1303 | * function multiple times per client (once for each openowner). So, |
| 1304 | * for v4.0 clients skip upcalling once the client has been recorded |
| 1305 | * on stable storage. |
| 1306 | * |
| 1307 | * For v4.1+ clients, the outcome of the two operations is different, |
| 1308 | * so we must ensure that we upcall for the create operation. v4.1+ |
| 1309 | * clients call this on RECLAIM_COMPLETE though, so we should only end |
| 1310 | * up doing a single create upcall per client. |
| 1311 | */ |
| 1312 | if (clp->cl_minorversion == 0 && |
| 1313 | test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 1314 | return; |
| 1315 | |
| 1316 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
| 1317 | if (!hexid) { |
| 1318 | dprintk("%s: can't allocate memory for upcall!\n", __func__); |
| 1319 | return; |
| 1320 | } |
| 1321 | |
| 1322 | has_session = nfsd4_cltrack_client_has_session(clp); |
| 1323 | grace_start = nfsd4_cltrack_grace_start(nn->boot_time); |
| 1324 | |
| 1325 | nfsd4_cltrack_upcall_lock(clp); |
| 1326 | if (!nfsd4_umh_cltrack_upcall("create", hexid, has_session, grace_start)) |
| 1327 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 1328 | nfsd4_cltrack_upcall_unlock(clp); |
| 1329 | |
| 1330 | kfree(has_session); |
| 1331 | kfree(grace_start); |
| 1332 | kfree(hexid); |
| 1333 | } |
| 1334 | |
| 1335 | static void |
| 1336 | nfsd4_umh_cltrack_remove(struct nfs4_client *clp) |
| 1337 | { |
| 1338 | char *hexid; |
| 1339 | |
| 1340 | if (!test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 1341 | return; |
| 1342 | |
| 1343 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
| 1344 | if (!hexid) { |
| 1345 | dprintk("%s: can't allocate memory for upcall!\n", __func__); |
| 1346 | return; |
| 1347 | } |
| 1348 | |
| 1349 | nfsd4_cltrack_upcall_lock(clp); |
| 1350 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags) && |
| 1351 | nfsd4_umh_cltrack_upcall("remove", hexid, NULL, NULL) == 0) |
| 1352 | clear_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 1353 | nfsd4_cltrack_upcall_unlock(clp); |
| 1354 | |
| 1355 | kfree(hexid); |
| 1356 | } |
| 1357 | |
| 1358 | static int |
| 1359 | nfsd4_umh_cltrack_check(struct nfs4_client *clp) |
| 1360 | { |
| 1361 | int ret; |
| 1362 | char *hexid, *has_session, *legacy; |
| 1363 | |
| 1364 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) |
| 1365 | return 0; |
| 1366 | |
| 1367 | hexid = bin_to_hex_dup(clp->cl_name.data, clp->cl_name.len); |
| 1368 | if (!hexid) { |
| 1369 | dprintk("%s: can't allocate memory for upcall!\n", __func__); |
| 1370 | return -ENOMEM; |
| 1371 | } |
| 1372 | |
| 1373 | has_session = nfsd4_cltrack_client_has_session(clp); |
| 1374 | legacy = nfsd4_cltrack_legacy_recdir(&clp->cl_name); |
| 1375 | |
| 1376 | nfsd4_cltrack_upcall_lock(clp); |
| 1377 | if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags)) { |
| 1378 | ret = 0; |
| 1379 | } else { |
| 1380 | ret = nfsd4_umh_cltrack_upcall("check", hexid, has_session, legacy); |
| 1381 | if (ret == 0) |
| 1382 | set_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags); |
| 1383 | } |
| 1384 | nfsd4_cltrack_upcall_unlock(clp); |
| 1385 | kfree(has_session); |
| 1386 | kfree(legacy); |
| 1387 | kfree(hexid); |
| 1388 | |
| 1389 | return ret; |
| 1390 | } |
| 1391 | |
| 1392 | static void |
| 1393 | nfsd4_umh_cltrack_grace_done(struct nfsd_net *nn) |
| 1394 | { |
| 1395 | char *legacy; |
| 1396 | char timestr[22]; /* FIXME: better way to determine max size? */ |
| 1397 | |
| 1398 | sprintf(timestr, "%ld", nn->boot_time); |
| 1399 | legacy = nfsd4_cltrack_legacy_topdir(); |
| 1400 | nfsd4_umh_cltrack_upcall("gracedone", timestr, legacy, NULL); |
| 1401 | kfree(legacy); |
| 1402 | } |
| 1403 | |
| 1404 | static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = { |
| 1405 | .init = nfsd4_umh_cltrack_init, |
| 1406 | .exit = NULL, |
| 1407 | .create = nfsd4_umh_cltrack_create, |
| 1408 | .remove = nfsd4_umh_cltrack_remove, |
| 1409 | .check = nfsd4_umh_cltrack_check, |
| 1410 | .grace_done = nfsd4_umh_cltrack_grace_done, |
| 1411 | }; |
| 1412 | |
| 1413 | int |
| 1414 | nfsd4_client_tracking_init(struct net *net) |
| 1415 | { |
| 1416 | int status; |
| 1417 | struct path path; |
| 1418 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 1419 | |
| 1420 | /* just run the init if it the method is already decided */ |
| 1421 | if (nn->client_tracking_ops) |
| 1422 | goto do_init; |
| 1423 | |
| 1424 | /* |
| 1425 | * First, try a UMH upcall. It should succeed or fail quickly, so |
| 1426 | * there's little harm in trying that first. |
| 1427 | */ |
| 1428 | nn->client_tracking_ops = &nfsd4_umh_tracking_ops; |
| 1429 | status = nn->client_tracking_ops->init(net); |
| 1430 | if (!status) |
| 1431 | return status; |
| 1432 | |
| 1433 | /* |
| 1434 | * See if the recoverydir exists and is a directory. If it is, |
| 1435 | * then use the legacy ops. |
| 1436 | */ |
| 1437 | nn->client_tracking_ops = &nfsd4_legacy_tracking_ops; |
| 1438 | status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path); |
| 1439 | if (!status) { |
| 1440 | status = d_is_dir(path.dentry); |
| 1441 | path_put(&path); |
| 1442 | if (status) |
| 1443 | goto do_init; |
| 1444 | } |
| 1445 | |
| 1446 | /* Finally, try to use nfsdcld */ |
| 1447 | nn->client_tracking_ops = &nfsd4_cld_tracking_ops; |
| 1448 | printk(KERN_WARNING "NFSD: the nfsdcld client tracking upcall will be " |
| 1449 | "removed in 3.10. Please transition to using " |
| 1450 | "nfsdcltrack.\n"); |
| 1451 | do_init: |
| 1452 | status = nn->client_tracking_ops->init(net); |
| 1453 | if (status) { |
| 1454 | printk(KERN_WARNING "NFSD: Unable to initialize client " |
| 1455 | "recovery tracking! (%d)\n", status); |
| 1456 | nn->client_tracking_ops = NULL; |
| 1457 | } |
| 1458 | return status; |
| 1459 | } |
| 1460 | |
| 1461 | void |
| 1462 | nfsd4_client_tracking_exit(struct net *net) |
| 1463 | { |
| 1464 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 1465 | |
| 1466 | if (nn->client_tracking_ops) { |
| 1467 | if (nn->client_tracking_ops->exit) |
| 1468 | nn->client_tracking_ops->exit(net); |
| 1469 | nn->client_tracking_ops = NULL; |
| 1470 | } |
| 1471 | } |
| 1472 | |
| 1473 | void |
| 1474 | nfsd4_client_record_create(struct nfs4_client *clp) |
| 1475 | { |
| 1476 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
| 1477 | |
| 1478 | if (nn->client_tracking_ops) |
| 1479 | nn->client_tracking_ops->create(clp); |
| 1480 | } |
| 1481 | |
| 1482 | void |
| 1483 | nfsd4_client_record_remove(struct nfs4_client *clp) |
| 1484 | { |
| 1485 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
| 1486 | |
| 1487 | if (nn->client_tracking_ops) |
| 1488 | nn->client_tracking_ops->remove(clp); |
| 1489 | } |
| 1490 | |
| 1491 | int |
| 1492 | nfsd4_client_record_check(struct nfs4_client *clp) |
| 1493 | { |
| 1494 | struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id); |
| 1495 | |
| 1496 | if (nn->client_tracking_ops) |
| 1497 | return nn->client_tracking_ops->check(clp); |
| 1498 | |
| 1499 | return -EOPNOTSUPP; |
| 1500 | } |
| 1501 | |
| 1502 | void |
| 1503 | nfsd4_record_grace_done(struct nfsd_net *nn) |
| 1504 | { |
| 1505 | if (nn->client_tracking_ops) |
| 1506 | nn->client_tracking_ops->grace_done(nn); |
| 1507 | } |
| 1508 | |
| 1509 | static int |
| 1510 | rpc_pipefs_event(struct notifier_block *nb, unsigned long event, void *ptr) |
| 1511 | { |
| 1512 | struct super_block *sb = ptr; |
| 1513 | struct net *net = sb->s_fs_info; |
| 1514 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 1515 | struct cld_net *cn = nn->cld_net; |
| 1516 | struct dentry *dentry; |
| 1517 | int ret = 0; |
| 1518 | |
| 1519 | if (!try_module_get(THIS_MODULE)) |
| 1520 | return 0; |
| 1521 | |
| 1522 | if (!cn) { |
| 1523 | module_put(THIS_MODULE); |
| 1524 | return 0; |
| 1525 | } |
| 1526 | |
| 1527 | switch (event) { |
| 1528 | case RPC_PIPEFS_MOUNT: |
| 1529 | dentry = nfsd4_cld_register_sb(sb, cn->cn_pipe); |
| 1530 | if (IS_ERR(dentry)) { |
| 1531 | ret = PTR_ERR(dentry); |
| 1532 | break; |
| 1533 | } |
| 1534 | cn->cn_pipe->dentry = dentry; |
| 1535 | break; |
| 1536 | case RPC_PIPEFS_UMOUNT: |
| 1537 | if (cn->cn_pipe->dentry) |
| 1538 | nfsd4_cld_unregister_sb(cn->cn_pipe); |
| 1539 | break; |
| 1540 | default: |
| 1541 | ret = -ENOTSUPP; |
| 1542 | break; |
| 1543 | } |
| 1544 | module_put(THIS_MODULE); |
| 1545 | return ret; |
| 1546 | } |
| 1547 | |
| 1548 | static struct notifier_block nfsd4_cld_block = { |
| 1549 | .notifier_call = rpc_pipefs_event, |
| 1550 | }; |
| 1551 | |
| 1552 | int |
| 1553 | register_cld_notifier(void) |
| 1554 | { |
| 1555 | return rpc_pipefs_notifier_register(&nfsd4_cld_block); |
| 1556 | } |
| 1557 | |
| 1558 | void |
| 1559 | unregister_cld_notifier(void) |
| 1560 | { |
| 1561 | rpc_pipefs_notifier_unregister(&nfsd4_cld_block); |
| 1562 | } |