1/* 2 * Copyright (C) 2005, 2006 3 * Avishay Traeger (avishay@gmail.com) 4 * Copyright (C) 2008, 2009 5 * Boaz Harrosh <bharrosh@panasas.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/exportfs.h> 39#include <linux/slab.h> 40 41#include "exofs.h" 42 43/****************************************************************************** 44 * MOUNT OPTIONS 45 *****************************************************************************/ 46 47/* 48 * struct to hold what we get from mount options 49 */ 50struct exofs_mountopt { 51 const char *dev_name; 52 uint64_t pid; 53 int timeout; 54}; 55 56/* 57 * exofs-specific mount-time options. 58 */ 59enum { Opt_pid, Opt_to, Opt_mkfs, Opt_format, Opt_err }; 60 61/* 62 * Our mount-time options. These should ideally be 64-bit unsigned, but the 63 * kernel's parsing functions do not currently support that. 32-bit should be 64 * sufficient for most applications now. 65 */ 66static match_table_t tokens = { 67 {Opt_pid, "pid=%u"}, 68 {Opt_to, "to=%u"}, 69 {Opt_err, NULL} 70}; 71 72/* 73 * The main option parsing method. Also makes sure that all of the mandatory 74 * mount options were set. 75 */ 76static int parse_options(char *options, struct exofs_mountopt *opts) 77{ 78 char *p; 79 substring_t args[MAX_OPT_ARGS]; 80 int option; 81 bool s_pid = false; 82 83 EXOFS_DBGMSG("parse_options %s\n", options); 84 /* defaults */ 85 memset(opts, 0, sizeof(*opts)); 86 opts->timeout = BLK_DEFAULT_SG_TIMEOUT; 87 88 while ((p = strsep(&options, ",")) != NULL) { 89 int token; 90 char str[32]; 91 92 if (!*p) 93 continue; 94 95 token = match_token(p, tokens, args); 96 switch (token) { 97 case Opt_pid: 98 if (0 == match_strlcpy(str, &args[0], sizeof(str))) 99 return -EINVAL; 100 opts->pid = simple_strtoull(str, NULL, 0); 101 if (opts->pid < EXOFS_MIN_PID) { 102 EXOFS_ERR("Partition ID must be >= %u", 103 EXOFS_MIN_PID); 104 return -EINVAL; 105 } 106 s_pid = 1; 107 break; 108 case Opt_to: 109 if (match_int(&args[0], &option)) 110 return -EINVAL; 111 if (option <= 0) { 112 EXOFS_ERR("Timout must be > 0"); 113 return -EINVAL; 114 } 115 opts->timeout = option * HZ; 116 break; 117 } 118 } 119 120 if (!s_pid) { 121 EXOFS_ERR("Need to specify the following options:\n"); 122 EXOFS_ERR(" -o pid=pid_no_to_use\n"); 123 return -EINVAL; 124 } 125 126 return 0; 127} 128 129/****************************************************************************** 130 * INODE CACHE 131 *****************************************************************************/ 132 133/* 134 * Our inode cache. Isn't it pretty? 135 */ 136static struct kmem_cache *exofs_inode_cachep; 137 138/* 139 * Allocate an inode in the cache 140 */ 141static struct inode *exofs_alloc_inode(struct super_block *sb) 142{ 143 struct exofs_i_info *oi; 144 145 oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL); 146 if (!oi) 147 return NULL; 148 149 oi->vfs_inode.i_version = 1; 150 return &oi->vfs_inode; 151} 152 153/* 154 * Remove an inode from the cache 155 */ 156static void exofs_destroy_inode(struct inode *inode) 157{ 158 kmem_cache_free(exofs_inode_cachep, exofs_i(inode)); 159} 160 161/* 162 * Initialize the inode 163 */ 164static void exofs_init_once(void *foo) 165{ 166 struct exofs_i_info *oi = foo; 167 168 inode_init_once(&oi->vfs_inode); 169} 170 171/* 172 * Create and initialize the inode cache 173 */ 174static int init_inodecache(void) 175{ 176 exofs_inode_cachep = kmem_cache_create("exofs_inode_cache", 177 sizeof(struct exofs_i_info), 0, 178 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, 179 exofs_init_once); 180 if (exofs_inode_cachep == NULL) 181 return -ENOMEM; 182 return 0; 183} 184 185/* 186 * Destroy the inode cache 187 */ 188static void destroy_inodecache(void) 189{ 190 kmem_cache_destroy(exofs_inode_cachep); 191} 192 193/****************************************************************************** 194 * SUPERBLOCK FUNCTIONS 195 *****************************************************************************/ 196static const struct super_operations exofs_sops; 197static const struct export_operations exofs_export_ops; 198 199/* 200 * Write the superblock to the OSD 201 */ 202int exofs_sync_fs(struct super_block *sb, int wait) 203{ 204 struct exofs_sb_info *sbi; 205 struct exofs_fscb *fscb; 206 struct exofs_io_state *ios; 207 int ret = -ENOMEM; 208 209 lock_super(sb); 210 sbi = sb->s_fs_info; 211 fscb = &sbi->s_fscb; 212 213 ret = exofs_get_io_state(&sbi->layout, &ios); 214 if (ret) 215 goto out; 216 217 /* Note: We only write the changing part of the fscb. .i.e upto the 218 * the fscb->s_dev_table_oid member. There is no read-modify-write 219 * here. 220 */ 221 ios->length = offsetof(struct exofs_fscb, s_dev_table_oid); 222 memset(fscb, 0, ios->length); 223 fscb->s_nextid = cpu_to_le64(sbi->s_nextid); 224 fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles); 225 fscb->s_magic = cpu_to_le16(sb->s_magic); 226 fscb->s_newfs = 0; 227 fscb->s_version = EXOFS_FSCB_VER; 228 229 ios->obj.id = EXOFS_SUPER_ID; 230 ios->offset = 0; 231 ios->kern_buff = fscb; 232 ios->cred = sbi->s_cred; 233 234 ret = exofs_sbi_write(ios); 235 if (unlikely(ret)) { 236 EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__); 237 goto out; 238 } 239 sb->s_dirt = 0; 240 241out: 242 EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret); 243 exofs_put_io_state(ios); 244 unlock_super(sb); 245 return ret; 246} 247 248static void exofs_write_super(struct super_block *sb) 249{ 250 if (!(sb->s_flags & MS_RDONLY)) 251 exofs_sync_fs(sb, 1); 252 else 253 sb->s_dirt = 0; 254} 255 256static void _exofs_print_device(const char *msg, const char *dev_path, 257 struct osd_dev *od, u64 pid) 258{ 259 const struct osd_dev_info *odi = osduld_device_info(od); 260 261 printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n", 262 msg, dev_path ?: "", odi->osdname, _LLU(pid)); 263} 264 265void exofs_free_sbi(struct exofs_sb_info *sbi) 266{ 267 while (sbi->layout.s_numdevs) { 268 int i = --sbi->layout.s_numdevs; 269 struct osd_dev *od = sbi->layout.s_ods[i]; 270 271 if (od) { 272 sbi->layout.s_ods[i] = NULL; 273 osduld_put_device(od); 274 } 275 } 276 kfree(sbi); 277} 278 279/* 280 * This function is called when the vfs is freeing the superblock. We just 281 * need to free our own part. 282 */ 283static void exofs_put_super(struct super_block *sb) 284{ 285 int num_pend; 286 struct exofs_sb_info *sbi = sb->s_fs_info; 287 288 if (sb->s_dirt) 289 exofs_write_super(sb); 290 291 /* make sure there are no pending commands */ 292 for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0; 293 num_pend = atomic_read(&sbi->s_curr_pending)) { 294 wait_queue_head_t wq; 295 init_waitqueue_head(&wq); 296 wait_event_timeout(wq, 297 (atomic_read(&sbi->s_curr_pending) == 0), 298 msecs_to_jiffies(100)); 299 } 300 301 _exofs_print_device("Unmounting", NULL, sbi->layout.s_ods[0], 302 sbi->layout.s_pid); 303 304 bdi_destroy(&sbi->bdi); 305 exofs_free_sbi(sbi); 306 sb->s_fs_info = NULL; 307} 308 309static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs, 310 struct exofs_device_table *dt) 311{ 312 u64 stripe_length; 313 314 sbi->data_map.odm_num_comps = 315 le32_to_cpu(dt->dt_data_map.cb_num_comps); 316 sbi->data_map.odm_stripe_unit = 317 le64_to_cpu(dt->dt_data_map.cb_stripe_unit); 318 sbi->data_map.odm_group_width = 319 le32_to_cpu(dt->dt_data_map.cb_group_width); 320 sbi->data_map.odm_group_depth = 321 le32_to_cpu(dt->dt_data_map.cb_group_depth); 322 sbi->data_map.odm_mirror_cnt = 323 le32_to_cpu(dt->dt_data_map.cb_mirror_cnt); 324 sbi->data_map.odm_raid_algorithm = 325 le32_to_cpu(dt->dt_data_map.cb_raid_algorithm); 326 327 if (sbi->data_map.odm_num_comps != numdevs) { 328 EXOFS_ERR("odm_num_comps(%u) != numdevs(%u)\n", 329 sbi->data_map.odm_num_comps, numdevs); 330 return -EINVAL; 331 } 332 if (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) { 333 EXOFS_ERR("Only RAID_0 for now\n"); 334 return -EINVAL; 335 } 336 if (0 != (numdevs % (sbi->data_map.odm_mirror_cnt + 1))) { 337 EXOFS_ERR("Data Map wrong, numdevs=%d mirrors=%d\n", 338 numdevs, sbi->data_map.odm_mirror_cnt); 339 return -EINVAL; 340 } 341 342 if (0 != (sbi->data_map.odm_stripe_unit & ~PAGE_MASK)) { 343 EXOFS_ERR("Stripe Unit(0x%llx)" 344 " must be Multples of PAGE_SIZE(0x%lx)\n", 345 _LLU(sbi->data_map.odm_stripe_unit), PAGE_SIZE); 346 return -EINVAL; 347 } 348 349 sbi->layout.stripe_unit = sbi->data_map.odm_stripe_unit; 350 sbi->layout.mirrors_p1 = sbi->data_map.odm_mirror_cnt + 1; 351 352 if (sbi->data_map.odm_group_width) { 353 sbi->layout.group_width = sbi->data_map.odm_group_width; 354 sbi->layout.group_depth = sbi->data_map.odm_group_depth; 355 if (!sbi->layout.group_depth) { 356 EXOFS_ERR("group_depth == 0 && group_width != 0\n"); 357 return -EINVAL; 358 } 359 sbi->layout.group_count = sbi->data_map.odm_num_comps / 360 sbi->layout.mirrors_p1 / 361 sbi->data_map.odm_group_width; 362 } else { 363 if (sbi->data_map.odm_group_depth) { 364 printk(KERN_NOTICE "Warning: group_depth ignored " 365 "group_width == 0 && group_depth == %d\n", 366 sbi->data_map.odm_group_depth); 367 sbi->data_map.odm_group_depth = 0; 368 } 369 sbi->layout.group_width = sbi->data_map.odm_num_comps / 370 sbi->layout.mirrors_p1; 371 sbi->layout.group_depth = -1; 372 sbi->layout.group_count = 1; 373 } 374 375 stripe_length = (u64)sbi->layout.group_width * sbi->layout.stripe_unit; 376 if (stripe_length >= (1ULL << 32)) { 377 EXOFS_ERR("Total Stripe length(0x%llx)" 378 " >= 32bit is not supported\n", _LLU(stripe_length)); 379 return -EINVAL; 380 } 381 382 return 0; 383} 384 385/* @odi is valid only as long as @fscb_dev is valid */ 386static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev, 387 struct osd_dev_info *odi) 388{ 389 odi->systemid_len = le32_to_cpu(dt_dev->systemid_len); 390 memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len); 391 392 odi->osdname_len = le32_to_cpu(dt_dev->osdname_len); 393 odi->osdname = dt_dev->osdname; 394 395 if (dt_dev->long_name_offset) 396 return -EINVAL; 397 398 /* Make sure osdname is printable! 399 * mkexofs should give us space for a null-terminator else the 400 * device-table is invalid. 401 */ 402 if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname))) 403 odi->osdname_len = sizeof(dt_dev->osdname) - 1; 404 dt_dev->osdname[odi->osdname_len] = 0; 405 406 /* If it's all zeros something is bad we read past end-of-obj */ 407 return !(odi->systemid_len || odi->osdname_len); 408} 409 410static int exofs_read_lookup_dev_table(struct exofs_sb_info **psbi, 411 unsigned table_count) 412{ 413 struct exofs_sb_info *sbi = *psbi; 414 struct osd_dev *fscb_od; 415 struct osd_obj_id obj = {.partition = sbi->layout.s_pid, 416 .id = EXOFS_DEVTABLE_ID}; 417 struct exofs_device_table *dt; 418 unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) + 419 sizeof(*dt); 420 unsigned numdevs, i; 421 int ret; 422 423 dt = kmalloc(table_bytes, GFP_KERNEL); 424 if (unlikely(!dt)) { 425 EXOFS_ERR("ERROR: allocating %x bytes for device table\n", 426 table_bytes); 427 return -ENOMEM; 428 } 429 430 fscb_od = sbi->layout.s_ods[0]; 431 sbi->layout.s_ods[0] = NULL; 432 sbi->layout.s_numdevs = 0; 433 ret = exofs_read_kern(fscb_od, sbi->s_cred, &obj, 0, dt, table_bytes); 434 if (unlikely(ret)) { 435 EXOFS_ERR("ERROR: reading device table\n"); 436 goto out; 437 } 438 439 numdevs = le64_to_cpu(dt->dt_num_devices); 440 if (unlikely(!numdevs)) { 441 ret = -EINVAL; 442 goto out; 443 } 444 WARN_ON(table_count != numdevs); 445 446 ret = _read_and_match_data_map(sbi, numdevs, dt); 447 if (unlikely(ret)) 448 goto out; 449 450 if (likely(numdevs > 1)) { 451 unsigned size = numdevs * sizeof(sbi->layout.s_ods[0]); 452 453 sbi = krealloc(sbi, sizeof(*sbi) + size, GFP_KERNEL); 454 if (unlikely(!sbi)) { 455 ret = -ENOMEM; 456 goto out; 457 } 458 memset(&sbi->layout.s_ods[1], 0, 459 size - sizeof(sbi->layout.s_ods[0])); 460 *psbi = sbi; 461 } 462 463 for (i = 0; i < numdevs; i++) { 464 struct exofs_fscb fscb; 465 struct osd_dev_info odi; 466 struct osd_dev *od; 467 468 if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) { 469 EXOFS_ERR("ERROR: Read all-zeros device entry\n"); 470 ret = -EINVAL; 471 goto out; 472 } 473 474 printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n", 475 i, odi.osdname); 476 477 /* On all devices the device table is identical. The user can 478 * specify any one of the participating devices on the command 479 * line. We always keep them in device-table order. 480 */ 481 if (fscb_od && osduld_device_same(fscb_od, &odi)) { 482 sbi->layout.s_ods[i] = fscb_od; 483 ++sbi->layout.s_numdevs; 484 fscb_od = NULL; 485 continue; 486 } 487 488 od = osduld_info_lookup(&odi); 489 if (unlikely(IS_ERR(od))) { 490 ret = PTR_ERR(od); 491 EXOFS_ERR("ERROR: device requested is not found " 492 "osd_name-%s =>%d\n", odi.osdname, ret); 493 goto out; 494 } 495 496 sbi->layout.s_ods[i] = od; 497 ++sbi->layout.s_numdevs; 498 499 /* Read the fscb of the other devices to make sure the FS 500 * partition is there. 501 */ 502 ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb, 503 sizeof(fscb)); 504 if (unlikely(ret)) { 505 EXOFS_ERR("ERROR: Malformed participating device " 506 "error reading fscb osd_name-%s\n", 507 odi.osdname); 508 goto out; 509 } 510 511 /* TODO: verify other information is correct and FS-uuid 512 * matches. Benny what did you say about device table 513 * generation and old devices? 514 */ 515 } 516 517out: 518 kfree(dt); 519 if (unlikely(!ret && fscb_od)) { 520 EXOFS_ERR( 521 "ERROR: Bad device-table container device not present\n"); 522 osduld_put_device(fscb_od); 523 ret = -EINVAL; 524 } 525 526 return ret; 527} 528 529/* 530 * Read the superblock from the OSD and fill in the fields 531 */ 532static int exofs_fill_super(struct super_block *sb, void *data, int silent) 533{ 534 struct inode *root; 535 struct exofs_mountopt *opts = data; 536 struct exofs_sb_info *sbi; /*extended info */ 537 struct osd_dev *od; /* Master device */ 538 struct exofs_fscb fscb; /*on-disk superblock info */ 539 struct osd_obj_id obj; 540 unsigned table_count; 541 int ret; 542 543 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 544 if (!sbi) 545 return -ENOMEM; 546 547 ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY); 548 if (ret) 549 goto free_bdi; 550 551 /* use mount options to fill superblock */ 552 od = osduld_path_lookup(opts->dev_name); 553 if (IS_ERR(od)) { 554 ret = PTR_ERR(od); 555 goto free_sbi; 556 } 557 558 /* Default layout in case we do not have a device-table */ 559 sbi->layout.stripe_unit = PAGE_SIZE; 560 sbi->layout.mirrors_p1 = 1; 561 sbi->layout.group_width = 1; 562 sbi->layout.group_depth = -1; 563 sbi->layout.group_count = 1; 564 sbi->layout.s_ods[0] = od; 565 sbi->layout.s_numdevs = 1; 566 sbi->layout.s_pid = opts->pid; 567 sbi->s_timeout = opts->timeout; 568 569 /* fill in some other data by hand */ 570 memset(sb->s_id, 0, sizeof(sb->s_id)); 571 strcpy(sb->s_id, "exofs"); 572 sb->s_blocksize = EXOFS_BLKSIZE; 573 sb->s_blocksize_bits = EXOFS_BLKSHIFT; 574 sb->s_maxbytes = MAX_LFS_FILESIZE; 575 atomic_set(&sbi->s_curr_pending, 0); 576 sb->s_bdev = NULL; 577 sb->s_dev = 0; 578 579 obj.partition = sbi->layout.s_pid; 580 obj.id = EXOFS_SUPER_ID; 581 exofs_make_credential(sbi->s_cred, &obj); 582 583 ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb, sizeof(fscb)); 584 if (unlikely(ret)) 585 goto free_sbi; 586 587 sb->s_magic = le16_to_cpu(fscb.s_magic); 588 sbi->s_nextid = le64_to_cpu(fscb.s_nextid); 589 sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles); 590 591 /* make sure what we read from the object store is correct */ 592 if (sb->s_magic != EXOFS_SUPER_MAGIC) { 593 if (!silent) 594 EXOFS_ERR("ERROR: Bad magic value\n"); 595 ret = -EINVAL; 596 goto free_sbi; 597 } 598 if (le32_to_cpu(fscb.s_version) != EXOFS_FSCB_VER) { 599 EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n", 600 EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version)); 601 ret = -EINVAL; 602 goto free_sbi; 603 } 604 605 /* start generation numbers from a random point */ 606 get_random_bytes(&sbi->s_next_generation, sizeof(u32)); 607 spin_lock_init(&sbi->s_next_gen_lock); 608 609 table_count = le64_to_cpu(fscb.s_dev_table_count); 610 if (table_count) { 611 ret = exofs_read_lookup_dev_table(&sbi, table_count); 612 if (unlikely(ret)) 613 goto free_sbi; 614 } 615 616 /* set up operation vectors */ 617 sb->s_bdi = &sbi->bdi; 618 sb->s_fs_info = sbi; 619 sb->s_op = &exofs_sops; 620 sb->s_export_op = &exofs_export_ops; 621 root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF); 622 if (IS_ERR(root)) { 623 EXOFS_ERR("ERROR: exofs_iget failed\n"); 624 ret = PTR_ERR(root); 625 goto free_sbi; 626 } 627 sb->s_root = d_alloc_root(root); 628 if (!sb->s_root) { 629 iput(root); 630 EXOFS_ERR("ERROR: get root inode failed\n"); 631 ret = -ENOMEM; 632 goto free_sbi; 633 } 634 635 if (!S_ISDIR(root->i_mode)) { 636 dput(sb->s_root); 637 sb->s_root = NULL; 638 EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n", 639 root->i_mode); 640 ret = -EINVAL; 641 goto free_sbi; 642 } 643 644 _exofs_print_device("Mounting", opts->dev_name, sbi->layout.s_ods[0], 645 sbi->layout.s_pid); 646 return 0; 647 648free_sbi: 649 bdi_destroy(&sbi->bdi); 650free_bdi: 651 EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n", 652 opts->dev_name, sbi->layout.s_pid, ret); 653 exofs_free_sbi(sbi); 654 return ret; 655} 656 657/* 658 * Set up the superblock (calls exofs_fill_super eventually) 659 */ 660static int exofs_get_sb(struct file_system_type *type, 661 int flags, const char *dev_name, 662 void *data, struct vfsmount *mnt) 663{ 664 struct exofs_mountopt opts; 665 int ret; 666 667 ret = parse_options(data, &opts); 668 if (ret) 669 return ret; 670 671 opts.dev_name = dev_name; 672 return get_sb_nodev(type, flags, &opts, exofs_fill_super, mnt); 673} 674 675/* 676 * Return information about the file system state in the buffer. This is used 677 * by the 'df' command, for example. 678 */ 679static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf) 680{ 681 struct super_block *sb = dentry->d_sb; 682 struct exofs_sb_info *sbi = sb->s_fs_info; 683 struct exofs_io_state *ios; 684 struct osd_attr attrs[] = { 685 ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS, 686 OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)), 687 ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION, 688 OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)), 689 }; 690 uint64_t capacity = ULLONG_MAX; 691 uint64_t used = ULLONG_MAX; 692 uint8_t cred_a[OSD_CAP_LEN]; 693 int ret; 694 695 ret = exofs_get_io_state(&sbi->layout, &ios); 696 if (ret) { 697 EXOFS_DBGMSG("exofs_get_io_state failed.\n"); 698 return ret; 699 } 700 701 exofs_make_credential(cred_a, &ios->obj); 702 ios->cred = sbi->s_cred; 703 ios->in_attr = attrs; 704 ios->in_attr_len = ARRAY_SIZE(attrs); 705 706 ret = exofs_sbi_read(ios); 707 if (unlikely(ret)) 708 goto out; 709 710 ret = extract_attr_from_ios(ios, &attrs[0]); 711 if (likely(!ret)) { 712 capacity = get_unaligned_be64(attrs[0].val_ptr); 713 if (unlikely(!capacity)) 714 capacity = ULLONG_MAX; 715 } else 716 EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n"); 717 718 ret = extract_attr_from_ios(ios, &attrs[1]); 719 if (likely(!ret)) 720 used = get_unaligned_be64(attrs[1].val_ptr); 721 else 722 EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n"); 723 724 /* fill in the stats buffer */ 725 buf->f_type = EXOFS_SUPER_MAGIC; 726 buf->f_bsize = EXOFS_BLKSIZE; 727 buf->f_blocks = capacity >> 9; 728 buf->f_bfree = (capacity - used) >> 9; 729 buf->f_bavail = buf->f_bfree; 730 buf->f_files = sbi->s_numfiles; 731 buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles; 732 buf->f_namelen = EXOFS_NAME_LEN; 733 734out: 735 exofs_put_io_state(ios); 736 return ret; 737} 738 739static const struct super_operations exofs_sops = { 740 .alloc_inode = exofs_alloc_inode, 741 .destroy_inode = exofs_destroy_inode, 742 .write_inode = exofs_write_inode, 743 .evict_inode = exofs_evict_inode, 744 .put_super = exofs_put_super, 745 .write_super = exofs_write_super, 746 .sync_fs = exofs_sync_fs, 747 .statfs = exofs_statfs, 748}; 749 750/****************************************************************************** 751 * EXPORT OPERATIONS 752 *****************************************************************************/ 753 754struct dentry *exofs_get_parent(struct dentry *child) 755{ 756 unsigned long ino = exofs_parent_ino(child); 757 758 if (!ino) 759 return NULL; 760 761 return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino)); 762} 763 764static struct inode *exofs_nfs_get_inode(struct super_block *sb, 765 u64 ino, u32 generation) 766{ 767 struct inode *inode; 768 769 inode = exofs_iget(sb, ino); 770 if (IS_ERR(inode)) 771 return ERR_CAST(inode); 772 if (generation && inode->i_generation != generation) { 773 /* we didn't find the right inode.. */ 774 iput(inode); 775 return ERR_PTR(-ESTALE); 776 } 777 return inode; 778} 779 780static struct dentry *exofs_fh_to_dentry(struct super_block *sb, 781 struct fid *fid, int fh_len, int fh_type) 782{ 783 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 784 exofs_nfs_get_inode); 785} 786 787static struct dentry *exofs_fh_to_parent(struct super_block *sb, 788 struct fid *fid, int fh_len, int fh_type) 789{ 790 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 791 exofs_nfs_get_inode); 792} 793 794static const struct export_operations exofs_export_ops = { 795 .fh_to_dentry = exofs_fh_to_dentry, 796 .fh_to_parent = exofs_fh_to_parent, 797 .get_parent = exofs_get_parent, 798}; 799 800/****************************************************************************** 801 * INSMOD/RMMOD 802 *****************************************************************************/ 803 804/* 805 * struct that describes this file system 806 */ 807static struct file_system_type exofs_type = { 808 .owner = THIS_MODULE, 809 .name = "exofs", 810 .get_sb = exofs_get_sb, 811 .kill_sb = generic_shutdown_super, 812}; 813 814static int __init init_exofs(void) 815{ 816 int err; 817 818 err = init_inodecache(); 819 if (err) 820 goto out; 821 822 err = register_filesystem(&exofs_type); 823 if (err) 824 goto out_d; 825 826 return 0; 827out_d: 828 destroy_inodecache(); 829out: 830 return err; 831} 832 833static void __exit exit_exofs(void) 834{ 835 unregister_filesystem(&exofs_type); 836 destroy_inodecache(); 837} 838 839MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>"); 840MODULE_DESCRIPTION("exofs"); 841MODULE_LICENSE("GPL"); 842 843module_init(init_exofs) 844module_exit(exit_exofs) 845