1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * (C) 2001 Clemson University and The University of Chicago 4 * 5 * See COPYING in top-level directory. 6 */ 7 8 #include "protocol.h" 9 #include "orangefs-kernel.h" 10 #include "orangefs-bufmap.h" 11 12 #include <linux/parser.h> 13 #include <linux/hashtable.h> 14 #include <linux/seq_file.h> 15 16 /* a cache for orangefs-inode objects (i.e. orangefs inode private data) */ 17 static struct kmem_cache *orangefs_inode_cache; 18 19 /* list for storing orangefs specific superblocks in use */ 20 LIST_HEAD(orangefs_superblocks); 21 22 DEFINE_SPINLOCK(orangefs_superblocks_lock); 23 24 enum { 25 Opt_intr, 26 Opt_acl, 27 Opt_local_lock, 28 29 Opt_err 30 }; 31 32 static const match_table_t tokens = { 33 { Opt_acl, "acl" }, 34 { Opt_intr, "intr" }, 35 { Opt_local_lock, "local_lock" }, 36 { Opt_err, NULL } 37 }; 38 39 uint64_t orangefs_features; 40 41 static int orangefs_show_options(struct seq_file *m, struct dentry *root) 42 { 43 struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(root->d_sb); 44 45 if (root->d_sb->s_flags & SB_POSIXACL) 46 seq_puts(m, ",acl"); 47 if (orangefs_sb->flags & ORANGEFS_OPT_INTR) 48 seq_puts(m, ",intr"); 49 if (orangefs_sb->flags & ORANGEFS_OPT_LOCAL_LOCK) 50 seq_puts(m, ",local_lock"); 51 return 0; 52 } 53 54 static int parse_mount_options(struct super_block *sb, char *options, 55 int silent) 56 { 57 struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(sb); 58 substring_t args[MAX_OPT_ARGS]; 59 char *p; 60 61 /* 62 * Force any potential flags that might be set from the mount 63 * to zero, ie, initialize to unset. 64 */ 65 sb->s_flags &= ~SB_POSIXACL; 66 orangefs_sb->flags &= ~ORANGEFS_OPT_INTR; 67 orangefs_sb->flags &= ~ORANGEFS_OPT_LOCAL_LOCK; 68 69 while ((p = strsep(&options, ",")) != NULL) { 70 int token; 71 72 if (!*p) 73 continue; 74 75 token = match_token(p, tokens, args); 76 switch (token) { 77 case Opt_acl: 78 sb->s_flags |= SB_POSIXACL; 79 break; 80 case Opt_intr: 81 orangefs_sb->flags |= ORANGEFS_OPT_INTR; 82 break; 83 case Opt_local_lock: 84 orangefs_sb->flags |= ORANGEFS_OPT_LOCAL_LOCK; 85 break; 86 default: 87 goto fail; 88 } 89 } 90 91 return 0; 92 fail: 93 if (!silent) 94 gossip_err("Error: mount option [%s] is not supported.\n", p); 95 return -EINVAL; 96 } 97 98 static void orangefs_inode_cache_ctor(void *req) 99 { 100 struct orangefs_inode_s *orangefs_inode = req; 101 102 inode_init_once(&orangefs_inode->vfs_inode); 103 init_rwsem(&orangefs_inode->xattr_sem); 104 } 105 106 static struct inode *orangefs_alloc_inode(struct super_block *sb) 107 { 108 struct orangefs_inode_s *orangefs_inode; 109 110 orangefs_inode = alloc_inode_sb(sb, orangefs_inode_cache, GFP_KERNEL); 111 if (!orangefs_inode) 112 return NULL; 113 114 /* 115 * We want to clear everything except for rw_semaphore and the 116 * vfs_inode. 117 */ 118 memset(&orangefs_inode->refn.khandle, 0, 16); 119 orangefs_inode->refn.fs_id = ORANGEFS_FS_ID_NULL; 120 orangefs_inode->last_failed_block_index_read = 0; 121 memset(orangefs_inode->link_target, 0, sizeof(orangefs_inode->link_target)); 122 123 gossip_debug(GOSSIP_SUPER_DEBUG, 124 "orangefs_alloc_inode: allocated %p\n", 125 &orangefs_inode->vfs_inode); 126 return &orangefs_inode->vfs_inode; 127 } 128 129 static void orangefs_free_inode(struct inode *inode) 130 { 131 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode); 132 struct orangefs_cached_xattr *cx; 133 struct hlist_node *tmp; 134 int i; 135 136 hash_for_each_safe(orangefs_inode->xattr_cache, i, tmp, cx, node) { 137 hlist_del(&cx->node); 138 kfree(cx); 139 } 140 141 kmem_cache_free(orangefs_inode_cache, orangefs_inode); 142 } 143 144 static void orangefs_destroy_inode(struct inode *inode) 145 { 146 struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode); 147 148 gossip_debug(GOSSIP_SUPER_DEBUG, 149 "%s: deallocated %p destroying inode %pU\n", 150 __func__, orangefs_inode, get_khandle_from_ino(inode)); 151 } 152 153 static int orangefs_write_inode(struct inode *inode, 154 struct writeback_control *wbc) 155 { 156 gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_write_inode\n"); 157 return orangefs_inode_setattr(inode); 158 } 159 160 /* 161 * NOTE: information filled in here is typically reflected in the 162 * output of the system command 'df' 163 */ 164 static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf) 165 { 166 int ret = -ENOMEM; 167 struct orangefs_kernel_op_s *new_op = NULL; 168 int flags = 0; 169 struct super_block *sb = NULL; 170 171 sb = dentry->d_sb; 172 173 gossip_debug(GOSSIP_SUPER_DEBUG, 174 "%s: called on sb %p (fs_id is %d)\n", 175 __func__, 176 sb, 177 (int)(ORANGEFS_SB(sb)->fs_id)); 178 179 new_op = op_alloc(ORANGEFS_VFS_OP_STATFS); 180 if (!new_op) 181 return ret; 182 new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id; 183 184 if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR) 185 flags = ORANGEFS_OP_INTERRUPTIBLE; 186 187 ret = service_operation(new_op, "orangefs_statfs", flags); 188 189 if (new_op->downcall.status < 0) 190 goto out_op_release; 191 192 gossip_debug(GOSSIP_SUPER_DEBUG, 193 "%s: got %ld blocks available | " 194 "%ld blocks total | %ld block size | " 195 "%ld files total | %ld files avail\n", 196 __func__, 197 (long)new_op->downcall.resp.statfs.blocks_avail, 198 (long)new_op->downcall.resp.statfs.blocks_total, 199 (long)new_op->downcall.resp.statfs.block_size, 200 (long)new_op->downcall.resp.statfs.files_total, 201 (long)new_op->downcall.resp.statfs.files_avail); 202 203 buf->f_type = sb->s_magic; 204 buf->f_fsid.val[0] = ORANGEFS_SB(sb)->fs_id; 205 buf->f_fsid.val[1] = ORANGEFS_SB(sb)->id; 206 buf->f_bsize = new_op->downcall.resp.statfs.block_size; 207 buf->f_namelen = ORANGEFS_NAME_MAX; 208 209 buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total; 210 buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail; 211 buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail; 212 buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total; 213 buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail; 214 buf->f_frsize = 0; 215 216 out_op_release: 217 op_release(new_op); 218 gossip_debug(GOSSIP_SUPER_DEBUG, "%s: returning %d\n", __func__, ret); 219 return ret; 220 } 221 222 /* 223 * Remount as initiated by VFS layer. We just need to reparse the mount 224 * options, no need to signal pvfs2-client-core about it. 225 */ 226 static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data) 227 { 228 gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n"); 229 return parse_mount_options(sb, data, 1); 230 } 231 232 /* 233 * Remount as initiated by pvfs2-client-core on restart. This is used to 234 * repopulate mount information left from previous pvfs2-client-core. 235 * 236 * the idea here is that given a valid superblock, we're 237 * re-initializing the user space client with the initial mount 238 * information specified when the super block was first initialized. 239 * this is very different than the first initialization/creation of a 240 * superblock. we use the special service_priority_operation to make 241 * sure that the mount gets ahead of any other pending operation that 242 * is waiting for servicing. this means that the pvfs2-client won't 243 * fail to start several times for all other pending operations before 244 * the client regains all of the mount information from us. 245 * NOTE: this function assumes that the request_mutex is already acquired! 246 */ 247 int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb) 248 { 249 struct orangefs_kernel_op_s *new_op; 250 int ret = -EINVAL; 251 252 gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n"); 253 254 new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT); 255 if (!new_op) 256 return -ENOMEM; 257 strscpy(new_op->upcall.req.fs_mount.orangefs_config_server, 258 orangefs_sb->devname); 259 260 gossip_debug(GOSSIP_SUPER_DEBUG, 261 "Attempting ORANGEFS Remount via host %s\n", 262 new_op->upcall.req.fs_mount.orangefs_config_server); 263 264 /* 265 * we assume that the calling function has already acquired the 266 * request_mutex to prevent other operations from bypassing 267 * this one 268 */ 269 ret = service_operation(new_op, "orangefs_remount", 270 ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX); 271 gossip_debug(GOSSIP_SUPER_DEBUG, 272 "orangefs_remount: mount got return value of %d\n", 273 ret); 274 if (ret == 0) { 275 /* 276 * store the id assigned to this sb -- it's just a 277 * short-lived mapping that the system interface uses 278 * to map this superblock to a particular mount entry 279 */ 280 orangefs_sb->id = new_op->downcall.resp.fs_mount.id; 281 orangefs_sb->mount_pending = 0; 282 } 283 284 op_release(new_op); 285 286 if (orangefs_userspace_version >= 20906) { 287 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES); 288 if (!new_op) 289 return -ENOMEM; 290 new_op->upcall.req.features.features = 0; 291 ret = service_operation(new_op, "orangefs_features", 292 ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX); 293 if (!ret) 294 orangefs_features = 295 new_op->downcall.resp.features.features; 296 else 297 orangefs_features = 0; 298 op_release(new_op); 299 } else { 300 orangefs_features = 0; 301 } 302 303 return ret; 304 } 305 306 int fsid_key_table_initialize(void) 307 { 308 return 0; 309 } 310 311 void fsid_key_table_finalize(void) 312 { 313 } 314 315 static const struct super_operations orangefs_s_ops = { 316 .alloc_inode = orangefs_alloc_inode, 317 .free_inode = orangefs_free_inode, 318 .destroy_inode = orangefs_destroy_inode, 319 .write_inode = orangefs_write_inode, 320 .drop_inode = generic_delete_inode, 321 .statfs = orangefs_statfs, 322 .remount_fs = orangefs_remount_fs, 323 .show_options = orangefs_show_options, 324 }; 325 326 static struct dentry *orangefs_fh_to_dentry(struct super_block *sb, 327 struct fid *fid, 328 int fh_len, 329 int fh_type) 330 { 331 struct orangefs_object_kref refn; 332 333 if (fh_len < 5 || fh_type > 2) 334 return NULL; 335 336 ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16); 337 refn.fs_id = (u32) fid->raw[4]; 338 gossip_debug(GOSSIP_SUPER_DEBUG, 339 "fh_to_dentry: handle %pU, fs_id %d\n", 340 &refn.khandle, 341 refn.fs_id); 342 343 return d_obtain_alias(orangefs_iget(sb, &refn)); 344 } 345 346 static int orangefs_encode_fh(struct inode *inode, 347 __u32 *fh, 348 int *max_len, 349 struct inode *parent) 350 { 351 int len = parent ? 10 : 5; 352 int type = 1; 353 struct orangefs_object_kref refn; 354 355 if (*max_len < len) { 356 gossip_err("fh buffer is too small for encoding\n"); 357 *max_len = len; 358 type = 255; 359 goto out; 360 } 361 362 refn = ORANGEFS_I(inode)->refn; 363 ORANGEFS_khandle_to(&refn.khandle, fh, 16); 364 fh[4] = refn.fs_id; 365 366 gossip_debug(GOSSIP_SUPER_DEBUG, 367 "Encoding fh: handle %pU, fsid %u\n", 368 &refn.khandle, 369 refn.fs_id); 370 371 372 if (parent) { 373 refn = ORANGEFS_I(parent)->refn; 374 ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16); 375 fh[9] = refn.fs_id; 376 377 type = 2; 378 gossip_debug(GOSSIP_SUPER_DEBUG, 379 "Encoding parent: handle %pU, fsid %u\n", 380 &refn.khandle, 381 refn.fs_id); 382 } 383 *max_len = len; 384 385 out: 386 return type; 387 } 388 389 static const struct export_operations orangefs_export_ops = { 390 .encode_fh = orangefs_encode_fh, 391 .fh_to_dentry = orangefs_fh_to_dentry, 392 }; 393 394 static int orangefs_unmount(int id, __s32 fs_id, const char *devname) 395 { 396 struct orangefs_kernel_op_s *op; 397 int r; 398 op = op_alloc(ORANGEFS_VFS_OP_FS_UMOUNT); 399 if (!op) 400 return -ENOMEM; 401 op->upcall.req.fs_umount.id = id; 402 op->upcall.req.fs_umount.fs_id = fs_id; 403 strscpy(op->upcall.req.fs_umount.orangefs_config_server, devname); 404 r = service_operation(op, "orangefs_fs_umount", 0); 405 /* Not much to do about an error here. */ 406 if (r) 407 gossip_err("orangefs_unmount: service_operation %d\n", r); 408 op_release(op); 409 return r; 410 } 411 412 static int orangefs_fill_sb(struct super_block *sb, 413 struct orangefs_fs_mount_response *fs_mount, 414 void *data, int silent) 415 { 416 int ret; 417 struct inode *root; 418 struct dentry *root_dentry; 419 struct orangefs_object_kref root_object; 420 421 ORANGEFS_SB(sb)->sb = sb; 422 423 ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle; 424 ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id; 425 ORANGEFS_SB(sb)->id = fs_mount->id; 426 427 if (data) { 428 ret = parse_mount_options(sb, data, silent); 429 if (ret) 430 return ret; 431 } 432 433 /* Hang the xattr handlers off the superblock */ 434 sb->s_xattr = orangefs_xattr_handlers; 435 sb->s_magic = ORANGEFS_SUPER_MAGIC; 436 sb->s_op = &orangefs_s_ops; 437 sb->s_d_op = &orangefs_dentry_operations; 438 439 sb->s_blocksize = PAGE_SIZE; 440 sb->s_blocksize_bits = PAGE_SHIFT; 441 sb->s_maxbytes = MAX_LFS_FILESIZE; 442 443 ret = super_setup_bdi(sb); 444 if (ret) 445 return ret; 446 447 root_object.khandle = ORANGEFS_SB(sb)->root_khandle; 448 root_object.fs_id = ORANGEFS_SB(sb)->fs_id; 449 gossip_debug(GOSSIP_SUPER_DEBUG, 450 "get inode %pU, fsid %d\n", 451 &root_object.khandle, 452 root_object.fs_id); 453 454 root = orangefs_iget(sb, &root_object); 455 if (IS_ERR(root)) 456 return PTR_ERR(root); 457 458 gossip_debug(GOSSIP_SUPER_DEBUG, 459 "Allocated root inode [%p] with mode %x\n", 460 root, 461 root->i_mode); 462 463 /* allocates and places root dentry in dcache */ 464 root_dentry = d_make_root(root); 465 if (!root_dentry) 466 return -ENOMEM; 467 468 sb->s_export_op = &orangefs_export_ops; 469 sb->s_root = root_dentry; 470 return 0; 471 } 472 473 struct dentry *orangefs_mount(struct file_system_type *fst, 474 int flags, 475 const char *devname, 476 void *data) 477 { 478 int ret; 479 struct super_block *sb = ERR_PTR(-EINVAL); 480 struct orangefs_kernel_op_s *new_op; 481 struct dentry *d = ERR_PTR(-EINVAL); 482 483 gossip_debug(GOSSIP_SUPER_DEBUG, 484 "orangefs_mount: called with devname %s\n", 485 devname); 486 487 if (!devname) { 488 gossip_err("ERROR: device name not specified.\n"); 489 return ERR_PTR(-EINVAL); 490 } 491 492 new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT); 493 if (!new_op) 494 return ERR_PTR(-ENOMEM); 495 496 strscpy(new_op->upcall.req.fs_mount.orangefs_config_server, devname); 497 498 gossip_debug(GOSSIP_SUPER_DEBUG, 499 "Attempting ORANGEFS Mount via host %s\n", 500 new_op->upcall.req.fs_mount.orangefs_config_server); 501 502 ret = service_operation(new_op, "orangefs_mount", 0); 503 gossip_debug(GOSSIP_SUPER_DEBUG, 504 "orangefs_mount: mount got return value of %d\n", ret); 505 if (ret) 506 goto free_op; 507 508 if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) { 509 gossip_err("ERROR: Retrieved null fs_id\n"); 510 ret = -EINVAL; 511 goto free_op; 512 } 513 514 sb = sget(fst, NULL, set_anon_super, flags, NULL); 515 516 if (IS_ERR(sb)) { 517 d = ERR_CAST(sb); 518 orangefs_unmount(new_op->downcall.resp.fs_mount.id, 519 new_op->downcall.resp.fs_mount.fs_id, devname); 520 goto free_op; 521 } 522 523 /* alloc and init our private orangefs sb info */ 524 sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL); 525 if (!ORANGEFS_SB(sb)) { 526 d = ERR_PTR(-ENOMEM); 527 goto free_op; 528 } 529 530 ret = orangefs_fill_sb(sb, 531 &new_op->downcall.resp.fs_mount, data, 532 flags & SB_SILENT ? 1 : 0); 533 534 if (ret) { 535 d = ERR_PTR(ret); 536 goto free_sb_and_op; 537 } 538 539 /* 540 * on successful mount, store the devname and data 541 * used 542 */ 543 strscpy(ORANGEFS_SB(sb)->devname, devname); 544 545 546 /* mount_pending must be cleared */ 547 ORANGEFS_SB(sb)->mount_pending = 0; 548 549 /* 550 * finally, add this sb to our list of known orangefs 551 * sb's 552 */ 553 gossip_debug(GOSSIP_SUPER_DEBUG, 554 "Adding SB %p to orangefs superblocks\n", 555 ORANGEFS_SB(sb)); 556 spin_lock(&orangefs_superblocks_lock); 557 list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks); 558 spin_unlock(&orangefs_superblocks_lock); 559 op_release(new_op); 560 561 /* Must be removed from the list now. */ 562 ORANGEFS_SB(sb)->no_list = 0; 563 564 if (orangefs_userspace_version >= 20906) { 565 new_op = op_alloc(ORANGEFS_VFS_OP_FEATURES); 566 if (!new_op) 567 return ERR_PTR(-ENOMEM); 568 new_op->upcall.req.features.features = 0; 569 ret = service_operation(new_op, "orangefs_features", 0); 570 orangefs_features = new_op->downcall.resp.features.features; 571 op_release(new_op); 572 } else { 573 orangefs_features = 0; 574 } 575 576 return dget(sb->s_root); 577 578 free_sb_and_op: 579 /* Will call orangefs_kill_sb with sb not in list. */ 580 ORANGEFS_SB(sb)->no_list = 1; 581 /* ORANGEFS_VFS_OP_FS_UMOUNT is done by orangefs_kill_sb. */ 582 deactivate_locked_super(sb); 583 free_op: 584 gossip_err("orangefs_mount: mount request failed with %d\n", ret); 585 if (ret == -EINVAL) { 586 gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n"); 587 gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n"); 588 } 589 590 op_release(new_op); 591 592 return d; 593 } 594 595 void orangefs_kill_sb(struct super_block *sb) 596 { 597 int r; 598 gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n"); 599 600 /* provided sb cleanup */ 601 kill_anon_super(sb); 602 603 if (!ORANGEFS_SB(sb)) { 604 mutex_lock(&orangefs_request_mutex); 605 mutex_unlock(&orangefs_request_mutex); 606 return; 607 } 608 /* 609 * issue the unmount to userspace to tell it to remove the 610 * dynamic mount info it has for this superblock 611 */ 612 r = orangefs_unmount(ORANGEFS_SB(sb)->id, ORANGEFS_SB(sb)->fs_id, 613 ORANGEFS_SB(sb)->devname); 614 if (!r) 615 ORANGEFS_SB(sb)->mount_pending = 1; 616 617 if (!ORANGEFS_SB(sb)->no_list) { 618 /* remove the sb from our list of orangefs specific sb's */ 619 spin_lock(&orangefs_superblocks_lock); 620 /* not list_del_init */ 621 __list_del_entry(&ORANGEFS_SB(sb)->list); 622 ORANGEFS_SB(sb)->list.prev = NULL; 623 spin_unlock(&orangefs_superblocks_lock); 624 } 625 626 /* 627 * make sure that ORANGEFS_DEV_REMOUNT_ALL loop that might've seen us 628 * gets completed before we free the dang thing. 629 */ 630 mutex_lock(&orangefs_request_mutex); 631 mutex_unlock(&orangefs_request_mutex); 632 633 /* free the orangefs superblock private data */ 634 kfree(ORANGEFS_SB(sb)); 635 } 636 637 int orangefs_inode_cache_initialize(void) 638 { 639 orangefs_inode_cache = kmem_cache_create_usercopy( 640 "orangefs_inode_cache", 641 sizeof(struct orangefs_inode_s), 642 0, 643 0, 644 offsetof(struct orangefs_inode_s, 645 link_target), 646 sizeof_field(struct orangefs_inode_s, 647 link_target), 648 orangefs_inode_cache_ctor); 649 650 if (!orangefs_inode_cache) { 651 gossip_err("Cannot create orangefs_inode_cache\n"); 652 return -ENOMEM; 653 } 654 return 0; 655 } 656 657 int orangefs_inode_cache_finalize(void) 658 { 659 kmem_cache_destroy(orangefs_inode_cache); 660 return 0; 661 } 662