1/* 2 * Copyright (C) 2005, 2006 3 * Avishay Traeger (avishay@gmail.com) 4 * Copyright (C) 2008, 2009 5 * Boaz Harrosh <ooo@electrozaur.com> 6 * 7 * Copyrights for code taken from ext2: 8 * Copyright (C) 1992, 1993, 1994, 1995 9 * Remy Card (card@masi.ibp.fr) 10 * Laboratoire MASI - Institut Blaise Pascal 11 * Universite Pierre et Marie Curie (Paris VI) 12 * from 13 * linux/fs/minix/inode.c 14 * Copyright (C) 1991, 1992 Linus Torvalds 15 * 16 * This file is part of exofs. 17 * 18 * exofs is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License as published by 20 * the Free Software Foundation. Since it is based on ext2, and the only 21 * valid version of GPL for the Linux kernel is version 2, the only valid 22 * version of GPL for exofs is version 2. 23 * 24 * exofs is distributed in the hope that it will be useful, 25 * but WITHOUT ANY WARRANTY; without even the implied warranty of 26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 27 * GNU General Public License for more details. 28 * 29 * You should have received a copy of the GNU General Public License 30 * along with exofs; if not, write to the Free Software 31 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 32 */ 33 34#include <linux/string.h> 35#include <linux/parser.h> 36#include <linux/vfs.h> 37#include <linux/random.h> 38#include <linux/module.h> 39#include <linux/exportfs.h> 40#include <linux/slab.h> 41 42#include "exofs.h" 43 44#define EXOFS_DBGMSG2(M...) do {} while (0) 45 46/****************************************************************************** 47 * MOUNT OPTIONS 48 *****************************************************************************/ 49 50/* 51 * struct to hold what we get from mount options 52 */ 53struct exofs_mountopt { 54 bool is_osdname; 55 const char *dev_name; 56 uint64_t pid; 57 int timeout; 58}; 59 60/* 61 * exofs-specific mount-time options. 62 */ 63enum { Opt_name, Opt_pid, Opt_to, Opt_err }; 64 65/* 66 * Our mount-time options. These should ideally be 64-bit unsigned, but the 67 * kernel's parsing functions do not currently support that. 32-bit should be 68 * sufficient for most applications now. 69 */ 70static match_table_t tokens = { 71 {Opt_name, "osdname=%s"}, 72 {Opt_pid, "pid=%u"}, 73 {Opt_to, "to=%u"}, 74 {Opt_err, NULL} 75}; 76 77/* 78 * The main option parsing method. Also makes sure that all of the mandatory 79 * mount options were set. 80 */ 81static int parse_options(char *options, struct exofs_mountopt *opts) 82{ 83 char *p; 84 substring_t args[MAX_OPT_ARGS]; 85 int option; 86 bool s_pid = false; 87 88 EXOFS_DBGMSG("parse_options %s\n", options); 89 /* defaults */ 90 memset(opts, 0, sizeof(*opts)); 91 opts->timeout = BLK_DEFAULT_SG_TIMEOUT; 92 93 while ((p = strsep(&options, ",")) != NULL) { 94 int token; 95 char str[32]; 96 97 if (!*p) 98 continue; 99 100 token = match_token(p, tokens, args); 101 switch (token) { 102 case Opt_name: 103 opts->dev_name = match_strdup(&args[0]); 104 if (unlikely(!opts->dev_name)) { 105 EXOFS_ERR("Error allocating dev_name"); 106 return -ENOMEM; 107 } 108 opts->is_osdname = true; 109 break; 110 case Opt_pid: 111 if (0 == match_strlcpy(str, &args[0], sizeof(str))) 112 return -EINVAL; 113 opts->pid = simple_strtoull(str, NULL, 0); 114 if (opts->pid < EXOFS_MIN_PID) { 115 EXOFS_ERR("Partition ID must be >= %u", 116 EXOFS_MIN_PID); 117 return -EINVAL; 118 } 119 s_pid = 1; 120 break; 121 case Opt_to: 122 if (match_int(&args[0], &option)) 123 return -EINVAL; 124 if (option <= 0) { 125 EXOFS_ERR("Timout must be > 0"); 126 return -EINVAL; 127 } 128 opts->timeout = option * HZ; 129 break; 130 } 131 } 132 133 if (!s_pid) { 134 EXOFS_ERR("Need to specify the following options:\n"); 135 EXOFS_ERR(" -o pid=pid_no_to_use\n"); 136 return -EINVAL; 137 } 138 139 return 0; 140} 141 142/****************************************************************************** 143 * INODE CACHE 144 *****************************************************************************/ 145 146/* 147 * Our inode cache. Isn't it pretty? 148 */ 149static struct kmem_cache *exofs_inode_cachep; 150 151/* 152 * Allocate an inode in the cache 153 */ 154static struct inode *exofs_alloc_inode(struct super_block *sb) 155{ 156 struct exofs_i_info *oi; 157 158 oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL); 159 if (!oi) 160 return NULL; 161 162 oi->vfs_inode.i_version = 1; 163 return &oi->vfs_inode; 164} 165 166static void exofs_i_callback(struct rcu_head *head) 167{ 168 struct inode *inode = container_of(head, struct inode, i_rcu); 169 kmem_cache_free(exofs_inode_cachep, exofs_i(inode)); 170} 171 172/* 173 * Remove an inode from the cache 174 */ 175static void exofs_destroy_inode(struct inode *inode) 176{ 177 call_rcu(&inode->i_rcu, exofs_i_callback); 178} 179 180/* 181 * Initialize the inode 182 */ 183static void exofs_init_once(void *foo) 184{ 185 struct exofs_i_info *oi = foo; 186 187 inode_init_once(&oi->vfs_inode); 188} 189 190/* 191 * Create and initialize the inode cache 192 */ 193static int init_inodecache(void) 194{ 195 exofs_inode_cachep = kmem_cache_create("exofs_inode_cache", 196 sizeof(struct exofs_i_info), 0, 197 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, 198 exofs_init_once); 199 if (exofs_inode_cachep == NULL) 200 return -ENOMEM; 201 return 0; 202} 203 204/* 205 * Destroy the inode cache 206 */ 207static void destroy_inodecache(void) 208{ 209 /* 210 * Make sure all delayed rcu free inodes are flushed before we 211 * destroy cache. 212 */ 213 rcu_barrier(); 214 kmem_cache_destroy(exofs_inode_cachep); 215} 216 217/****************************************************************************** 218 * Some osd helpers 219 *****************************************************************************/ 220void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj) 221{ 222 osd_sec_init_nosec_doall_caps(cred_a, obj, false, true); 223} 224 225static int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj, 226 u64 offset, void *p, unsigned length) 227{ 228 struct osd_request *or = osd_start_request(od, GFP_KERNEL); 229/* struct osd_sense_info osi = {.key = 0};*/ 230 int ret; 231 232 if (unlikely(!or)) { 233 EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__); 234 return -ENOMEM; 235 } 236 ret = osd_req_read_kern(or, obj, offset, p, length); 237 if (unlikely(ret)) { 238 EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__); 239 goto out; 240 } 241 242 ret = osd_finalize_request(or, 0, cred, NULL); 243 if (unlikely(ret)) { 244 EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret); 245 goto out; 246 } 247 248 ret = osd_execute_request(or); 249 if (unlikely(ret)) 250 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret); 251 /* osd_req_decode_sense(or, ret); */ 252 253out: 254 osd_end_request(or); 255 EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx " 256 "length=0x%llx dev=%p ret=>%d\n", 257 _LLU(obj->id), _LLU(offset), _LLU(length), od, ret); 258 return ret; 259} 260 261static const struct osd_attr g_attr_sb_stats = ATTR_DEF( 262 EXOFS_APAGE_SB_DATA, 263 EXOFS_ATTR_SB_STATS, 264 sizeof(struct exofs_sb_stats)); 265 266static int __sbi_read_stats(struct exofs_sb_info *sbi) 267{ 268 struct osd_attr attrs[] = { 269 [0] = g_attr_sb_stats, 270 }; 271 struct ore_io_state *ios; 272 int ret; 273 274 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); 275 if (unlikely(ret)) { 276 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); 277 return ret; 278 } 279 280 ios->in_attr = attrs; 281 ios->in_attr_len = ARRAY_SIZE(attrs); 282 283 ret = ore_read(ios); 284 if (unlikely(ret)) { 285 EXOFS_ERR("Error reading super_block stats => %d\n", ret); 286 goto out; 287 } 288 289 ret = extract_attr_from_ios(ios, &attrs[0]); 290 if (ret) { 291 EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__); 292 goto out; 293 } 294 if (attrs[0].len) { 295 struct exofs_sb_stats *ess; 296 297 if (unlikely(attrs[0].len != sizeof(*ess))) { 298 EXOFS_ERR("%s: Wrong version of exofs_sb_stats " 299 "size(%d) != expected(%zd)\n", 300 __func__, attrs[0].len, sizeof(*ess)); 301 goto out; 302 } 303 304 ess = attrs[0].val_ptr; 305 sbi->s_nextid = le64_to_cpu(ess->s_nextid); 306 sbi->s_numfiles = le32_to_cpu(ess->s_numfiles); 307 } 308 309out: 310 ore_put_io_state(ios); 311 return ret; 312} 313 314static void stats_done(struct ore_io_state *ios, void *p) 315{ 316 ore_put_io_state(ios); 317 /* Good thanks nothing to do anymore */ 318} 319 320/* Asynchronously write the stats attribute */ 321int exofs_sbi_write_stats(struct exofs_sb_info *sbi) 322{ 323 struct osd_attr attrs[] = { 324 [0] = g_attr_sb_stats, 325 }; 326 struct ore_io_state *ios; 327 int ret; 328 329 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); 330 if (unlikely(ret)) { 331 EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); 332 return ret; 333 } 334 335 sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid); 336 sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles); 337 attrs[0].val_ptr = &sbi->s_ess; 338 339 340 ios->done = stats_done; 341 ios->private = sbi; 342 ios->out_attr = attrs; 343 ios->out_attr_len = ARRAY_SIZE(attrs); 344 345 ret = ore_write(ios); 346 if (unlikely(ret)) { 347 EXOFS_ERR("%s: ore_write failed.\n", __func__); 348 ore_put_io_state(ios); 349 } 350 351 return ret; 352} 353 354/****************************************************************************** 355 * SUPERBLOCK FUNCTIONS 356 *****************************************************************************/ 357static const struct super_operations exofs_sops; 358static const struct export_operations exofs_export_ops; 359 360/* 361 * Write the superblock to the OSD 362 */ 363static int exofs_sync_fs(struct super_block *sb, int wait) 364{ 365 struct exofs_sb_info *sbi; 366 struct exofs_fscb *fscb; 367 struct ore_comp one_comp; 368 struct ore_components oc; 369 struct ore_io_state *ios; 370 int ret = -ENOMEM; 371 372 fscb = kmalloc(sizeof(*fscb), GFP_KERNEL); 373 if (unlikely(!fscb)) 374 return -ENOMEM; 375 376 sbi = sb->s_fs_info; 377 378 /* NOTE: We no longer dirty the super_block anywhere in exofs. The 379 * reason we write the fscb here on unmount is so we can stay backwards 380 * compatible with fscb->s_version == 1. (What we are not compatible 381 * with is if a new version FS crashed and then we try to mount an old 382 * version). Otherwise the exofs_fscb is read-only from mkfs time. All 383 * the writeable info is set in exofs_sbi_write_stats() above. 384 */ 385 386 exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID); 387 388 ret = ore_get_io_state(&sbi->layout, &oc, &ios); 389 if (unlikely(ret)) 390 goto out; 391 392 ios->length = offsetof(struct exofs_fscb, s_dev_table_oid); 393 memset(fscb, 0, ios->length); 394 fscb->s_nextid = cpu_to_le64(sbi->s_nextid); 395 fscb->s_numfiles = cpu_to_le64(sbi->s_numfiles); 396 fscb->s_magic = cpu_to_le16(sb->s_magic); 397 fscb->s_newfs = 0; 398 fscb->s_version = EXOFS_FSCB_VER; 399 400 ios->offset = 0; 401 ios->kern_buff = fscb; 402 403 ret = ore_write(ios); 404 if (unlikely(ret)) 405 EXOFS_ERR("%s: ore_write failed.\n", __func__); 406 407out: 408 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret); 409 ore_put_io_state(ios); 410 kfree(fscb); 411 return ret; 412} 413 414static void _exofs_print_device(const char *msg, const char *dev_path, 415 struct osd_dev *od, u64 pid) 416{ 417 const struct osd_dev_info *odi = osduld_device_info(od); 418 419 printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n", 420 msg, dev_path ?: "", odi->osdname, _LLU(pid)); 421} 422 423static void exofs_free_sbi(struct exofs_sb_info *sbi) 424{ 425 unsigned numdevs = sbi->oc.numdevs; 426 427 while (numdevs) { 428 unsigned i = --numdevs; 429 struct osd_dev *od = ore_comp_dev(&sbi->oc, i); 430 431 if (od) { 432 ore_comp_set_dev(&sbi->oc, i, NULL); 433 osduld_put_device(od); 434 } 435 } 436 kfree(sbi->oc.ods); 437 kfree(sbi); 438} 439 440/* 441 * This function is called when the vfs is freeing the superblock. We just 442 * need to free our own part. 443 */ 444static void exofs_put_super(struct super_block *sb) 445{ 446 int num_pend; 447 struct exofs_sb_info *sbi = sb->s_fs_info; 448 449 /* make sure there are no pending commands */ 450 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0; 451 num_pend = atomic_read(&sbi->s_curr_pending)) { 452 wait_queue_head_t wq; 453 454 printk(KERN_NOTICE "%s: !!Pending operations in flight. " 455 "This is a BUG. please report to osd-dev@open-osd.org\n", 456 __func__); 457 init_waitqueue_head(&wq); 458 wait_event_timeout(wq, 459 (atomic_read(&sbi->s_curr_pending) == 0), 460 msecs_to_jiffies(100)); 461 } 462 463 _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0), 464 sbi->one_comp.obj.partition); 465 466 exofs_sysfs_sb_del(sbi); 467 bdi_destroy(&sbi->bdi); 468 exofs_free_sbi(sbi); 469 sb->s_fs_info = NULL; 470} 471 472static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs, 473 struct exofs_device_table *dt) 474{ 475 int ret; 476 477 sbi->layout.stripe_unit = 478 le64_to_cpu(dt->dt_data_map.cb_stripe_unit); 479 sbi->layout.group_width = 480 le32_to_cpu(dt->dt_data_map.cb_group_width); 481 sbi->layout.group_depth = 482 le32_to_cpu(dt->dt_data_map.cb_group_depth); 483 sbi->layout.mirrors_p1 = 484 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1; 485 sbi->layout.raid_algorithm = 486 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm); 487 488 ret = ore_verify_layout(numdevs, &sbi->layout); 489 490 EXOFS_DBGMSG("exofs: layout: " 491 "num_comps=%u stripe_unit=0x%x group_width=%u " 492 "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n", 493 numdevs, 494 sbi->layout.stripe_unit, 495 sbi->layout.group_width, 496 _LLU(sbi->layout.group_depth), 497 sbi->layout.mirrors_p1, 498 sbi->layout.raid_algorithm); 499 return ret; 500} 501 502static unsigned __ra_pages(struct ore_layout *layout) 503{ 504 const unsigned _MIN_RA = 32; /* min 128K read-ahead */ 505 unsigned ra_pages = layout->group_width * layout->stripe_unit / 506 PAGE_SIZE; 507 unsigned max_io_pages = exofs_max_io_pages(layout, ~0); 508 509 ra_pages *= 2; /* two stripes */ 510 if (ra_pages < _MIN_RA) 511 ra_pages = roundup(_MIN_RA, ra_pages / 2); 512 513 if (ra_pages > max_io_pages) 514 ra_pages = max_io_pages; 515 516 return ra_pages; 517} 518 519/* @odi is valid only as long as @fscb_dev is valid */ 520static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev, 521 struct osd_dev_info *odi) 522{ 523 odi->systemid_len = le32_to_cpu(dt_dev->systemid_len); 524 if (likely(odi->systemid_len)) 525 memcpy(odi->systemid, dt_dev->systemid, OSD_SYSTEMID_LEN); 526 527 odi->osdname_len = le32_to_cpu(dt_dev->osdname_len); 528 odi->osdname = dt_dev->osdname; 529 530 /* FIXME support long names. Will need a _put function */ 531 if (dt_dev->long_name_offset) 532 return -EINVAL; 533 534 /* Make sure osdname is printable! 535 * mkexofs should give us space for a null-terminator else the 536 * device-table is invalid. 537 */ 538 if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname))) 539 odi->osdname_len = sizeof(dt_dev->osdname) - 1; 540 dt_dev->osdname[odi->osdname_len] = 0; 541 542 /* If it's all zeros something is bad we read past end-of-obj */ 543 return !(odi->systemid_len || odi->osdname_len); 544} 545 546static int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs, 547 struct exofs_dev **peds) 548{ 549 struct __alloc_ore_devs_and_exofs_devs { 550 /* Twice bigger table: See exofs_init_comps() and comment at 551 * exofs_read_lookup_dev_table() 552 */ 553 struct ore_dev *oreds[numdevs * 2 - 1]; 554 struct exofs_dev eds[numdevs]; 555 } *aoded; 556 struct exofs_dev *eds; 557 unsigned i; 558 559 aoded = kzalloc(sizeof(*aoded), GFP_KERNEL); 560 if (unlikely(!aoded)) { 561 EXOFS_ERR("ERROR: failed allocating Device array[%d]\n", 562 numdevs); 563 return -ENOMEM; 564 } 565 566 sbi->oc.ods = aoded->oreds; 567 *peds = eds = aoded->eds; 568 for (i = 0; i < numdevs; ++i) 569 aoded->oreds[i] = &eds[i].ored; 570 return 0; 571} 572 573static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi, 574 struct osd_dev *fscb_od, 575 unsigned table_count) 576{ 577 struct ore_comp comp; 578 struct exofs_device_table *dt; 579 struct exofs_dev *eds; 580 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) + 581 sizeof(*dt); 582 unsigned numdevs, i; 583 int ret; 584 585 dt = kmalloc(table_bytes, GFP_KERNEL); 586 if (unlikely(!dt)) { 587 EXOFS_ERR("ERROR: allocating %x bytes for device table\n", 588 table_bytes); 589 return -ENOMEM; 590 } 591 592 sbi->oc.numdevs = 0; 593 594 comp.obj.partition = sbi->one_comp.obj.partition; 595 comp.obj.id = EXOFS_DEVTABLE_ID; 596 exofs_make_credential(comp.cred, &comp.obj); 597 598 ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt, 599 table_bytes); 600 if (unlikely(ret)) { 601 EXOFS_ERR("ERROR: reading device table\n"); 602 goto out; 603 } 604 605 numdevs = le64_to_cpu(dt->dt_num_devices); 606 if (unlikely(!numdevs)) { 607 ret = -EINVAL; 608 goto out; 609 } 610 WARN_ON(table_count != numdevs); 611 612 ret = _read_and_match_data_map(sbi, numdevs, dt); 613 if (unlikely(ret)) 614 goto out; 615 616 ret = __alloc_dev_table(sbi, numdevs, &eds); 617 if (unlikely(ret)) 618 goto out; 619 /* exofs round-robins the device table view according to inode 620 * number. We hold a: twice bigger table hence inodes can point 621 * to any device and have a sequential view of the table 622 * starting at this device. See exofs_init_comps() 623 */ 624 memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0], 625 (numdevs - 1) * sizeof(sbi->oc.ods[0])); 626 627 /* create sysfs subdir under which we put the device table 628 * And cluster layout. A Superblock is identified by the string: 629 * "dev[0].osdname"_"pid" 630 */ 631 exofs_sysfs_sb_add(sbi, &dt->dt_dev_table[0]); 632 633 for (i = 0; i < numdevs; i++) { 634 struct exofs_fscb fscb; 635 struct osd_dev_info odi; 636 struct osd_dev *od; 637 638 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) { 639 EXOFS_ERR("ERROR: Read all-zeros device entry\n"); 640 ret = -EINVAL; 641 goto out; 642 } 643 644 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n", 645 i, odi.osdname); 646 647 /* the exofs id is currently the table index */ 648 eds[i].did = i; 649 650 /* On all devices the device table is identical. The user can 651 * specify any one of the participating devices on the command 652 * line. We always keep them in device-table order. 653 */ 654 if (fscb_od && osduld_device_same(fscb_od, &odi)) { 655 eds[i].ored.od = fscb_od; 656 ++sbi->oc.numdevs; 657 fscb_od = NULL; 658 exofs_sysfs_odev_add(&eds[i], sbi); 659 continue; 660 } 661 662 od = osduld_info_lookup(&odi); 663 if (IS_ERR(od)) { 664 ret = PTR_ERR(od); 665 EXOFS_ERR("ERROR: device requested is not found " 666 "osd_name-%s =>%d\n", odi.osdname, ret); 667 goto out; 668 } 669 670 eds[i].ored.od = od; 671 ++sbi->oc.numdevs; 672 673 /* Read the fscb of the other devices to make sure the FS 674 * partition is there. 675 */ 676 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, 677 sizeof(fscb)); 678 if (unlikely(ret)) { 679 EXOFS_ERR("ERROR: Malformed participating device " 680 "error reading fscb osd_name-%s\n", 681 odi.osdname); 682 goto out; 683 } 684 exofs_sysfs_odev_add(&eds[i], sbi); 685 686 /* TODO: verify other information is correct and FS-uuid 687 * matches. Benny what did you say about device table 688 * generation and old devices? 689 */ 690 } 691 692out: 693 kfree(dt); 694 if (unlikely(fscb_od && !ret)) { 695 EXOFS_ERR("ERROR: Bad device-table container device not present\n"); 696 osduld_put_device(fscb_od); 697 return -EINVAL; 698 } 699 return ret; 700} 701 702/* 703 * Read the superblock from the OSD and fill in the fields 704 */ 705static int exofs_fill_super(struct super_block *sb, void *data, int silent) 706{ 707 struct inode *root; 708 struct exofs_mountopt *opts = data; 709 struct exofs_sb_info *sbi; /*extended info */ 710 struct osd_dev *od; /* Master device */ 711 struct exofs_fscb fscb; /*on-disk superblock info */ 712 struct ore_comp comp; 713 unsigned table_count; 714 int ret; 715 716 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 717 if (!sbi) 718 return -ENOMEM; 719 720 /* use mount options to fill superblock */ 721 if (opts->is_osdname) { 722 struct osd_dev_info odi = {.systemid_len = 0}; 723 724 odi.osdname_len = strlen(opts->dev_name); 725 odi.osdname = (u8 *)opts->dev_name; 726 od = osduld_info_lookup(&odi); 727 kfree(opts->dev_name); 728 opts->dev_name = NULL; 729 } else { 730 od = osduld_path_lookup(opts->dev_name); 731 } 732 if (IS_ERR(od)) { 733 ret = -EINVAL; 734 goto free_sbi; 735 } 736 737 /* Default layout in case we do not have a device-table */ 738 sbi->layout.stripe_unit = PAGE_SIZE; 739 sbi->layout.mirrors_p1 = 1; 740 sbi->layout.group_width = 1; 741 sbi->layout.group_depth = -1; 742 sbi->layout.group_count = 1; 743 sbi->s_timeout = opts->timeout; 744 745 sbi->one_comp.obj.partition = opts->pid; 746 sbi->one_comp.obj.id = 0; 747 exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj); 748 sbi->oc.single_comp = EC_SINGLE_COMP; 749 sbi->oc.comps = &sbi->one_comp; 750 751 /* fill in some other data by hand */ 752 memset(sb->s_id, 0, sizeof(sb->s_id)); 753 strcpy(sb->s_id, "exofs"); 754 sb->s_blocksize = EXOFS_BLKSIZE; 755 sb->s_blocksize_bits = EXOFS_BLKSHIFT; 756 sb->s_maxbytes = MAX_LFS_FILESIZE; 757 sb->s_max_links = EXOFS_LINK_MAX; 758 atomic_set(&sbi->s_curr_pending, 0); 759 sb->s_bdev = NULL; 760 sb->s_dev = 0; 761 762 comp.obj.partition = sbi->one_comp.obj.partition; 763 comp.obj.id = EXOFS_SUPER_ID; 764 exofs_make_credential(comp.cred, &comp.obj); 765 766 ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb)); 767 if (unlikely(ret)) 768 goto free_sbi; 769 770 sb->s_magic = le16_to_cpu(fscb.s_magic); 771 /* NOTE: we read below to be backward compatible with old versions */ 772 sbi->s_nextid = le64_to_cpu(fscb.s_nextid); 773 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles); 774 775 /* make sure what we read from the object store is correct */ 776 if (sb->s_magic != EXOFS_SUPER_MAGIC) { 777 if (!silent) 778 EXOFS_ERR("ERROR: Bad magic value\n"); 779 ret = -EINVAL; 780 goto free_sbi; 781 } 782 if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) { 783 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n", 784 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version)); 785 ret = -EINVAL; 786 goto free_sbi; 787 } 788 789 /* start generation numbers from a random point */ 790 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 791 spin_lock_init(&sbi->s_next_gen_lock); 792 793 table_count = le64_to_cpu(fscb.s_dev_table_count); 794 if (table_count) { 795 ret = exofs_read_lookup_dev_table(sbi, od, table_count); 796 if (unlikely(ret)) 797 goto free_sbi; 798 } else { 799 struct exofs_dev *eds; 800 801 ret = __alloc_dev_table(sbi, 1, &eds); 802 if (unlikely(ret)) 803 goto free_sbi; 804 805 ore_comp_set_dev(&sbi->oc, 0, od); 806 sbi->oc.numdevs = 1; 807 } 808 809 __sbi_read_stats(sbi); 810 811 /* set up operation vectors */ 812 sbi->bdi.ra_pages = __ra_pages(&sbi->layout); 813 sb->s_bdi = &sbi->bdi; 814 sb->s_fs_info = sbi; 815 sb->s_op = &exofs_sops; 816 sb->s_export_op = &exofs_export_ops; 817 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF); 818 if (IS_ERR(root)) { 819 EXOFS_ERR("ERROR: exofs_iget failed\n"); 820 ret = PTR_ERR(root); 821 goto free_sbi; 822 } 823 sb->s_root = d_make_root(root); 824 if (!sb->s_root) { 825 EXOFS_ERR("ERROR: get root inode failed\n"); 826 ret = -ENOMEM; 827 goto free_sbi; 828 } 829 830 if (!S_ISDIR(root->i_mode)) { 831 dput(sb->s_root); 832 sb->s_root = NULL; 833 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n", 834 root->i_mode); 835 ret = -EINVAL; 836 goto free_sbi; 837 } 838 839 ret = bdi_setup_and_register(&sbi->bdi, "exofs"); 840 if (ret) { 841 EXOFS_DBGMSG("Failed to bdi_setup_and_register\n"); 842 dput(sb->s_root); 843 sb->s_root = NULL; 844 goto free_sbi; 845 } 846 847 exofs_sysfs_dbg_print(); 848 _exofs_print_device("Mounting", opts->dev_name, 849 ore_comp_dev(&sbi->oc, 0), 850 sbi->one_comp.obj.partition); 851 return 0; 852 853free_sbi: 854 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n", 855 opts->dev_name, sbi->one_comp.obj.partition, ret); 856 exofs_free_sbi(sbi); 857 return ret; 858} 859 860/* 861 * Set up the superblock (calls exofs_fill_super eventually) 862 */ 863static struct dentry *exofs_mount(struct file_system_type *type, 864 int flags, const char *dev_name, 865 void *data) 866{ 867 struct exofs_mountopt opts; 868 int ret; 869 870 ret = parse_options(data, &opts); 871 if (ret) 872 return ERR_PTR(ret); 873 874 if (!opts.dev_name) 875 opts.dev_name = dev_name; 876 return mount_nodev(type, flags, &opts, exofs_fill_super); 877} 878 879/* 880 * Return information about the file system state in the buffer. This is used 881 * by the 'df' command, for example. 882 */ 883static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf) 884{ 885 struct super_block *sb = dentry->d_sb; 886 struct exofs_sb_info *sbi = sb->s_fs_info; 887 struct ore_io_state *ios; 888 struct osd_attr attrs[] = { 889 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS, 890 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)), 891 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION, 892 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)), 893 }; 894 uint64_t capacity = ULLONG_MAX; 895 uint64_t used = ULLONG_MAX; 896 int ret; 897 898 ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); 899 if (ret) { 900 EXOFS_DBGMSG("ore_get_io_state failed.\n"); 901 return ret; 902 } 903 904 ios->in_attr = attrs; 905 ios->in_attr_len = ARRAY_SIZE(attrs); 906 907 ret = ore_read(ios); 908 if (unlikely(ret)) 909 goto out; 910 911 ret = extract_attr_from_ios(ios, &attrs[0]); 912 if (likely(!ret)) { 913 capacity = get_unaligned_be64(attrs[0].val_ptr); 914 if (unlikely(!capacity)) 915 capacity = ULLONG_MAX; 916 } else 917 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n"); 918 919 ret = extract_attr_from_ios(ios, &attrs[1]); 920 if (likely(!ret)) 921 used = get_unaligned_be64(attrs[1].val_ptr); 922 else 923 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n"); 924 925 /* fill in the stats buffer */ 926 buf->f_type = EXOFS_SUPER_MAGIC; 927 buf->f_bsize = EXOFS_BLKSIZE; 928 buf->f_blocks = capacity >> 9; 929 buf->f_bfree = (capacity - used) >> 9; 930 buf->f_bavail = buf->f_bfree; 931 buf->f_files = sbi->s_numfiles; 932 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles; 933 buf->f_namelen = EXOFS_NAME_LEN; 934 935out: 936 ore_put_io_state(ios); 937 return ret; 938} 939 940static const struct super_operations exofs_sops = { 941 .alloc_inode = exofs_alloc_inode, 942 .destroy_inode = exofs_destroy_inode, 943 .write_inode = exofs_write_inode, 944 .evict_inode = exofs_evict_inode, 945 .put_super = exofs_put_super, 946 .sync_fs = exofs_sync_fs, 947 .statfs = exofs_statfs, 948}; 949 950/****************************************************************************** 951 * EXPORT OPERATIONS 952 *****************************************************************************/ 953 954static struct dentry *exofs_get_parent(struct dentry *child) 955{ 956 unsigned long ino = exofs_parent_ino(child); 957 958 if (!ino) 959 return ERR_PTR(-ESTALE); 960 961 return d_obtain_alias(exofs_iget(d_inode(child)->i_sb, ino)); 962} 963 964static struct inode *exofs_nfs_get_inode(struct super_block *sb, 965 u64 ino, u32 generation) 966{ 967 struct inode *inode; 968 969 inode = exofs_iget(sb, ino); 970 if (IS_ERR(inode)) 971 return ERR_CAST(inode); 972 if (generation && inode->i_generation != generation) { 973 /* we didn't find the right inode.. */ 974 iput(inode); 975 return ERR_PTR(-ESTALE); 976 } 977 return inode; 978} 979 980static struct dentry *exofs_fh_to_dentry(struct super_block *sb, 981 struct fid *fid, int fh_len, int fh_type) 982{ 983 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 984 exofs_nfs_get_inode); 985} 986 987static struct dentry *exofs_fh_to_parent(struct super_block *sb, 988 struct fid *fid, int fh_len, int fh_type) 989{ 990 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 991 exofs_nfs_get_inode); 992} 993 994static const struct export_operations exofs_export_ops = { 995 .fh_to_dentry = exofs_fh_to_dentry, 996 .fh_to_parent = exofs_fh_to_parent, 997 .get_parent = exofs_get_parent, 998}; 999 1000/****************************************************************************** 1001 * INSMOD/RMMOD 1002 *****************************************************************************/ 1003 1004/* 1005 * struct that describes this file system 1006 */ 1007static struct file_system_type exofs_type = { 1008 .owner = THIS_MODULE, 1009 .name = "exofs", 1010 .mount = exofs_mount, 1011 .kill_sb = generic_shutdown_super, 1012}; 1013MODULE_ALIAS_FS("exofs"); 1014 1015static int __init init_exofs(void) 1016{ 1017 int err; 1018 1019 err = init_inodecache(); 1020 if (err) 1021 goto out; 1022 1023 err = register_filesystem(&exofs_type); 1024 if (err) 1025 goto out_d; 1026 1027 /* We don't fail if sysfs creation failed */ 1028 exofs_sysfs_init(); 1029 1030 return 0; 1031out_d: 1032 destroy_inodecache(); 1033out: 1034 return err; 1035} 1036 1037static void __exit exit_exofs(void) 1038{ 1039 exofs_sysfs_uninit(); 1040 unregister_filesystem(&exofs_type); 1041 destroy_inodecache(); 1042} 1043 1044MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>"); 1045MODULE_DESCRIPTION("exofs"); 1046MODULE_LICENSE("GPL"); 1047 1048module_init(init_exofs) 1049module_exit(exit_exofs) 1050