1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/bio.h> 13 #include <linux/sched.h> 14 #include <linux/slab.h> 15 #include <linux/spinlock.h> 16 #include <linux/completion.h> 17 #include <linux/buffer_head.h> 18 #include <linux/statfs.h> 19 #include <linux/seq_file.h> 20 #include <linux/mount.h> 21 #include <linux/kthread.h> 22 #include <linux/delay.h> 23 #include <linux/gfs2_ondisk.h> 24 #include <linux/crc32.h> 25 #include <linux/time.h> 26 #include <linux/wait.h> 27 #include <linux/writeback.h> 28 #include <linux/backing-dev.h> 29 #include <linux/kernel.h> 30 31 #include "gfs2.h" 32 #include "incore.h" 33 #include "bmap.h" 34 #include "dir.h" 35 #include "glock.h" 36 #include "glops.h" 37 #include "inode.h" 38 #include "log.h" 39 #include "meta_io.h" 40 #include "quota.h" 41 #include "recovery.h" 42 #include "rgrp.h" 43 #include "super.h" 44 #include "trans.h" 45 #include "util.h" 46 #include "sys.h" 47 #include "xattr.h" 48 49 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x) 50 51 enum { 52 Opt_lockproto, 53 Opt_locktable, 54 Opt_hostdata, 55 Opt_spectator, 56 Opt_ignore_local_fs, 57 Opt_localflocks, 58 Opt_localcaching, 59 Opt_debug, 60 Opt_nodebug, 61 Opt_upgrade, 62 Opt_acl, 63 Opt_noacl, 64 Opt_quota_off, 65 Opt_quota_account, 66 Opt_quota_on, 67 Opt_quota, 68 Opt_noquota, 69 Opt_suiddir, 70 Opt_nosuiddir, 71 Opt_data_writeback, 72 Opt_data_ordered, 73 Opt_meta, 74 Opt_discard, 75 Opt_nodiscard, 76 Opt_commit, 77 Opt_err_withdraw, 78 Opt_err_panic, 79 Opt_statfs_quantum, 80 Opt_statfs_percent, 81 Opt_quota_quantum, 82 Opt_barrier, 83 Opt_nobarrier, 84 Opt_rgrplvb, 85 Opt_norgrplvb, 86 Opt_error, 87 }; 88 89 static const match_table_t tokens = { 90 {Opt_lockproto, "lockproto=%s"}, 91 {Opt_locktable, "locktable=%s"}, 92 {Opt_hostdata, "hostdata=%s"}, 93 {Opt_spectator, "spectator"}, 94 {Opt_spectator, "norecovery"}, 95 {Opt_ignore_local_fs, "ignore_local_fs"}, 96 {Opt_localflocks, "localflocks"}, 97 {Opt_localcaching, "localcaching"}, 98 {Opt_debug, "debug"}, 99 {Opt_nodebug, "nodebug"}, 100 {Opt_upgrade, "upgrade"}, 101 {Opt_acl, "acl"}, 102 {Opt_noacl, "noacl"}, 103 {Opt_quota_off, "quota=off"}, 104 {Opt_quota_account, "quota=account"}, 105 {Opt_quota_on, "quota=on"}, 106 {Opt_quota, "quota"}, 107 {Opt_noquota, "noquota"}, 108 {Opt_suiddir, "suiddir"}, 109 {Opt_nosuiddir, "nosuiddir"}, 110 {Opt_data_writeback, "data=writeback"}, 111 {Opt_data_ordered, "data=ordered"}, 112 {Opt_meta, "meta"}, 113 {Opt_discard, "discard"}, 114 {Opt_nodiscard, "nodiscard"}, 115 {Opt_commit, "commit=%d"}, 116 {Opt_err_withdraw, "errors=withdraw"}, 117 {Opt_err_panic, "errors=panic"}, 118 {Opt_statfs_quantum, "statfs_quantum=%d"}, 119 {Opt_statfs_percent, "statfs_percent=%d"}, 120 {Opt_quota_quantum, "quota_quantum=%d"}, 121 {Opt_barrier, "barrier"}, 122 {Opt_nobarrier, "nobarrier"}, 123 {Opt_rgrplvb, "rgrplvb"}, 124 {Opt_norgrplvb, "norgrplvb"}, 125 {Opt_error, NULL} 126 }; 127 128 /** 129 * gfs2_mount_args - Parse mount options 130 * @args: The structure into which the parsed options will be written 131 * @options: The options to parse 132 * 133 * Return: errno 134 */ 135 136 int gfs2_mount_args(struct gfs2_args *args, char *options) 137 { 138 char *o; 139 int token; 140 substring_t tmp[MAX_OPT_ARGS]; 141 int rv; 142 143 /* Split the options into tokens with the "," character and 144 process them */ 145 146 while (1) { 147 o = strsep(&options, ","); 148 if (o == NULL) 149 break; 150 if (*o == '\0') 151 continue; 152 153 token = match_token(o, tokens, tmp); 154 switch (token) { 155 case Opt_lockproto: 156 match_strlcpy(args->ar_lockproto, &tmp[0], 157 GFS2_LOCKNAME_LEN); 158 break; 159 case Opt_locktable: 160 match_strlcpy(args->ar_locktable, &tmp[0], 161 GFS2_LOCKNAME_LEN); 162 break; 163 case Opt_hostdata: 164 match_strlcpy(args->ar_hostdata, &tmp[0], 165 GFS2_LOCKNAME_LEN); 166 break; 167 case Opt_spectator: 168 args->ar_spectator = 1; 169 break; 170 case Opt_ignore_local_fs: 171 /* Retained for backwards compat only */ 172 break; 173 case Opt_localflocks: 174 args->ar_localflocks = 1; 175 break; 176 case Opt_localcaching: 177 /* Retained for backwards compat only */ 178 break; 179 case Opt_debug: 180 if (args->ar_errors == GFS2_ERRORS_PANIC) { 181 pr_warn("-o debug and -o errors=panic are mutually exclusive\n"); 182 return -EINVAL; 183 } 184 args->ar_debug = 1; 185 break; 186 case Opt_nodebug: 187 args->ar_debug = 0; 188 break; 189 case Opt_upgrade: 190 /* Retained for backwards compat only */ 191 break; 192 case Opt_acl: 193 args->ar_posix_acl = 1; 194 break; 195 case Opt_noacl: 196 args->ar_posix_acl = 0; 197 break; 198 case Opt_quota_off: 199 case Opt_noquota: 200 args->ar_quota = GFS2_QUOTA_OFF; 201 break; 202 case Opt_quota_account: 203 args->ar_quota = GFS2_QUOTA_ACCOUNT; 204 break; 205 case Opt_quota_on: 206 case Opt_quota: 207 args->ar_quota = GFS2_QUOTA_ON; 208 break; 209 case Opt_suiddir: 210 args->ar_suiddir = 1; 211 break; 212 case Opt_nosuiddir: 213 args->ar_suiddir = 0; 214 break; 215 case Opt_data_writeback: 216 args->ar_data = GFS2_DATA_WRITEBACK; 217 break; 218 case Opt_data_ordered: 219 args->ar_data = GFS2_DATA_ORDERED; 220 break; 221 case Opt_meta: 222 args->ar_meta = 1; 223 break; 224 case Opt_discard: 225 args->ar_discard = 1; 226 break; 227 case Opt_nodiscard: 228 args->ar_discard = 0; 229 break; 230 case Opt_commit: 231 rv = match_int(&tmp[0], &args->ar_commit); 232 if (rv || args->ar_commit <= 0) { 233 pr_warn("commit mount option requires a positive numeric argument\n"); 234 return rv ? rv : -EINVAL; 235 } 236 break; 237 case Opt_statfs_quantum: 238 rv = match_int(&tmp[0], &args->ar_statfs_quantum); 239 if (rv || args->ar_statfs_quantum < 0) { 240 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n"); 241 return rv ? rv : -EINVAL; 242 } 243 break; 244 case Opt_quota_quantum: 245 rv = match_int(&tmp[0], &args->ar_quota_quantum); 246 if (rv || args->ar_quota_quantum <= 0) { 247 pr_warn("quota_quantum mount option requires a positive numeric argument\n"); 248 return rv ? rv : -EINVAL; 249 } 250 break; 251 case Opt_statfs_percent: 252 rv = match_int(&tmp[0], &args->ar_statfs_percent); 253 if (rv || args->ar_statfs_percent < 0 || 254 args->ar_statfs_percent > 100) { 255 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n"); 256 return rv ? rv : -EINVAL; 257 } 258 break; 259 case Opt_err_withdraw: 260 args->ar_errors = GFS2_ERRORS_WITHDRAW; 261 break; 262 case Opt_err_panic: 263 if (args->ar_debug) { 264 pr_warn("-o debug and -o errors=panic are mutually exclusive\n"); 265 return -EINVAL; 266 } 267 args->ar_errors = GFS2_ERRORS_PANIC; 268 break; 269 case Opt_barrier: 270 args->ar_nobarrier = 0; 271 break; 272 case Opt_nobarrier: 273 args->ar_nobarrier = 1; 274 break; 275 case Opt_rgrplvb: 276 args->ar_rgrplvb = 1; 277 break; 278 case Opt_norgrplvb: 279 args->ar_rgrplvb = 0; 280 break; 281 case Opt_error: 282 default: 283 pr_warn("invalid mount option: %s\n", o); 284 return -EINVAL; 285 } 286 } 287 288 return 0; 289 } 290 291 /** 292 * gfs2_jindex_free - Clear all the journal index information 293 * @sdp: The GFS2 superblock 294 * 295 */ 296 297 void gfs2_jindex_free(struct gfs2_sbd *sdp) 298 { 299 struct list_head list; 300 struct gfs2_jdesc *jd; 301 302 spin_lock(&sdp->sd_jindex_spin); 303 list_add(&list, &sdp->sd_jindex_list); 304 list_del_init(&sdp->sd_jindex_list); 305 sdp->sd_journals = 0; 306 spin_unlock(&sdp->sd_jindex_spin); 307 308 while (!list_empty(&list)) { 309 jd = list_entry(list.next, struct gfs2_jdesc, jd_list); 310 gfs2_free_journal_extents(jd); 311 list_del(&jd->jd_list); 312 iput(jd->jd_inode); 313 kfree(jd); 314 } 315 } 316 317 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) 318 { 319 struct gfs2_jdesc *jd; 320 int found = 0; 321 322 list_for_each_entry(jd, head, jd_list) { 323 if (jd->jd_jid == jid) { 324 found = 1; 325 break; 326 } 327 } 328 329 if (!found) 330 jd = NULL; 331 332 return jd; 333 } 334 335 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) 336 { 337 struct gfs2_jdesc *jd; 338 339 spin_lock(&sdp->sd_jindex_spin); 340 jd = jdesc_find_i(&sdp->sd_jindex_list, jid); 341 spin_unlock(&sdp->sd_jindex_spin); 342 343 return jd; 344 } 345 346 int gfs2_jdesc_check(struct gfs2_jdesc *jd) 347 { 348 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 349 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 350 u64 size = i_size_read(jd->jd_inode); 351 352 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30)) 353 return -EIO; 354 355 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift; 356 357 if (gfs2_write_alloc_required(ip, 0, size)) { 358 gfs2_consist_inode(ip); 359 return -EIO; 360 } 361 362 return 0; 363 } 364 365 static int init_threads(struct gfs2_sbd *sdp) 366 { 367 struct task_struct *p; 368 int error = 0; 369 370 p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); 371 if (IS_ERR(p)) { 372 error = PTR_ERR(p); 373 fs_err(sdp, "can't start logd thread: %d\n", error); 374 return error; 375 } 376 sdp->sd_logd_process = p; 377 378 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); 379 if (IS_ERR(p)) { 380 error = PTR_ERR(p); 381 fs_err(sdp, "can't start quotad thread: %d\n", error); 382 goto fail; 383 } 384 sdp->sd_quotad_process = p; 385 return 0; 386 387 fail: 388 kthread_stop(sdp->sd_logd_process); 389 return error; 390 } 391 392 /** 393 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one 394 * @sdp: the filesystem 395 * 396 * Returns: errno 397 */ 398 399 int gfs2_make_fs_rw(struct gfs2_sbd *sdp) 400 { 401 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 402 struct gfs2_glock *j_gl = ip->i_gl; 403 struct gfs2_holder freeze_gh; 404 struct gfs2_log_header_host head; 405 int error; 406 407 error = init_threads(sdp); 408 if (error) 409 return error; 410 411 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0, 412 &freeze_gh); 413 if (error) 414 goto fail_threads; 415 416 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 417 418 error = gfs2_find_jhead(sdp->sd_jdesc, &head); 419 if (error) 420 goto fail; 421 422 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 423 gfs2_consist(sdp); 424 error = -EIO; 425 goto fail; 426 } 427 428 /* Initialize some head of the log stuff */ 429 sdp->sd_log_sequence = head.lh_sequence + 1; 430 gfs2_log_pointers_init(sdp, head.lh_blkno); 431 432 error = gfs2_quota_init(sdp); 433 if (error) 434 goto fail; 435 436 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 437 438 gfs2_glock_dq_uninit(&freeze_gh); 439 440 return 0; 441 442 fail: 443 freeze_gh.gh_flags |= GL_NOCACHE; 444 gfs2_glock_dq_uninit(&freeze_gh); 445 fail_threads: 446 kthread_stop(sdp->sd_quotad_process); 447 kthread_stop(sdp->sd_logd_process); 448 return error; 449 } 450 451 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) 452 { 453 const struct gfs2_statfs_change *str = buf; 454 455 sc->sc_total = be64_to_cpu(str->sc_total); 456 sc->sc_free = be64_to_cpu(str->sc_free); 457 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); 458 } 459 460 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) 461 { 462 struct gfs2_statfs_change *str = buf; 463 464 str->sc_total = cpu_to_be64(sc->sc_total); 465 str->sc_free = cpu_to_be64(sc->sc_free); 466 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); 467 } 468 469 int gfs2_statfs_init(struct gfs2_sbd *sdp) 470 { 471 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 472 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 473 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 474 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 475 struct buffer_head *m_bh, *l_bh; 476 struct gfs2_holder gh; 477 int error; 478 479 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 480 &gh); 481 if (error) 482 return error; 483 484 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 485 if (error) 486 goto out; 487 488 if (sdp->sd_args.ar_spectator) { 489 spin_lock(&sdp->sd_statfs_spin); 490 gfs2_statfs_change_in(m_sc, m_bh->b_data + 491 sizeof(struct gfs2_dinode)); 492 spin_unlock(&sdp->sd_statfs_spin); 493 } else { 494 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 495 if (error) 496 goto out_m_bh; 497 498 spin_lock(&sdp->sd_statfs_spin); 499 gfs2_statfs_change_in(m_sc, m_bh->b_data + 500 sizeof(struct gfs2_dinode)); 501 gfs2_statfs_change_in(l_sc, l_bh->b_data + 502 sizeof(struct gfs2_dinode)); 503 spin_unlock(&sdp->sd_statfs_spin); 504 505 brelse(l_bh); 506 } 507 508 out_m_bh: 509 brelse(m_bh); 510 out: 511 gfs2_glock_dq_uninit(&gh); 512 return 0; 513 } 514 515 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, 516 s64 dinodes) 517 { 518 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 519 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 520 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 521 struct buffer_head *l_bh; 522 s64 x, y; 523 int need_sync = 0; 524 int error; 525 526 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 527 if (error) 528 return; 529 530 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 531 532 spin_lock(&sdp->sd_statfs_spin); 533 l_sc->sc_total += total; 534 l_sc->sc_free += free; 535 l_sc->sc_dinodes += dinodes; 536 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); 537 if (sdp->sd_args.ar_statfs_percent) { 538 x = 100 * l_sc->sc_free; 539 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent; 540 if (x >= y || x <= -y) 541 need_sync = 1; 542 } 543 spin_unlock(&sdp->sd_statfs_spin); 544 545 brelse(l_bh); 546 if (need_sync) 547 gfs2_wake_up_statfs(sdp); 548 } 549 550 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh, 551 struct buffer_head *l_bh) 552 { 553 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 554 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 555 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 556 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 557 558 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 559 560 spin_lock(&sdp->sd_statfs_spin); 561 m_sc->sc_total += l_sc->sc_total; 562 m_sc->sc_free += l_sc->sc_free; 563 m_sc->sc_dinodes += l_sc->sc_dinodes; 564 memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); 565 memset(l_bh->b_data + sizeof(struct gfs2_dinode), 566 0, sizeof(struct gfs2_statfs_change)); 567 spin_unlock(&sdp->sd_statfs_spin); 568 569 gfs2_trans_add_meta(m_ip->i_gl, m_bh); 570 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); 571 } 572 573 int gfs2_statfs_sync(struct super_block *sb, int type) 574 { 575 struct gfs2_sbd *sdp = sb->s_fs_info; 576 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 577 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 578 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 579 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 580 struct gfs2_holder gh; 581 struct buffer_head *m_bh, *l_bh; 582 int error; 583 584 sb_start_write(sb); 585 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 586 &gh); 587 if (error) 588 goto out; 589 590 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 591 if (error) 592 goto out_unlock; 593 594 spin_lock(&sdp->sd_statfs_spin); 595 gfs2_statfs_change_in(m_sc, m_bh->b_data + 596 sizeof(struct gfs2_dinode)); 597 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { 598 spin_unlock(&sdp->sd_statfs_spin); 599 goto out_bh; 600 } 601 spin_unlock(&sdp->sd_statfs_spin); 602 603 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 604 if (error) 605 goto out_bh; 606 607 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 608 if (error) 609 goto out_bh2; 610 611 update_statfs(sdp, m_bh, l_bh); 612 sdp->sd_statfs_force_sync = 0; 613 614 gfs2_trans_end(sdp); 615 616 out_bh2: 617 brelse(l_bh); 618 out_bh: 619 brelse(m_bh); 620 out_unlock: 621 gfs2_glock_dq_uninit(&gh); 622 out: 623 sb_end_write(sb); 624 return error; 625 } 626 627 struct lfcc { 628 struct list_head list; 629 struct gfs2_holder gh; 630 }; 631 632 /** 633 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all 634 * journals are clean 635 * @sdp: the file system 636 * @state: the state to put the transaction lock into 637 * @t_gh: the hold on the transaction lock 638 * 639 * Returns: errno 640 */ 641 642 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, 643 struct gfs2_holder *freeze_gh) 644 { 645 struct gfs2_inode *ip; 646 struct gfs2_jdesc *jd; 647 struct lfcc *lfcc; 648 LIST_HEAD(list); 649 struct gfs2_log_header_host lh; 650 int error; 651 652 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 653 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); 654 if (!lfcc) { 655 error = -ENOMEM; 656 goto out; 657 } 658 ip = GFS2_I(jd->jd_inode); 659 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); 660 if (error) { 661 kfree(lfcc); 662 goto out; 663 } 664 list_add(&lfcc->list, &list); 665 } 666 667 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE, 668 GL_NOCACHE, freeze_gh); 669 670 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 671 error = gfs2_jdesc_check(jd); 672 if (error) 673 break; 674 error = gfs2_find_jhead(jd, &lh); 675 if (error) 676 break; 677 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 678 error = -EBUSY; 679 break; 680 } 681 } 682 683 if (error) 684 gfs2_glock_dq_uninit(freeze_gh); 685 686 out: 687 while (!list_empty(&list)) { 688 lfcc = list_entry(list.next, struct lfcc, list); 689 list_del(&lfcc->list); 690 gfs2_glock_dq_uninit(&lfcc->gh); 691 kfree(lfcc); 692 } 693 return error; 694 } 695 696 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 697 { 698 struct gfs2_dinode *str = buf; 699 700 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 701 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); 702 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); 703 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); 704 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); 705 str->di_mode = cpu_to_be32(ip->i_inode.i_mode); 706 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode)); 707 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode)); 708 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); 709 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode)); 710 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); 711 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 712 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); 713 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); 714 715 str->di_goal_meta = cpu_to_be64(ip->i_goal); 716 str->di_goal_data = cpu_to_be64(ip->i_goal); 717 str->di_generation = cpu_to_be64(ip->i_generation); 718 719 str->di_flags = cpu_to_be32(ip->i_diskflags); 720 str->di_height = cpu_to_be16(ip->i_height); 721 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && 722 !(ip->i_diskflags & GFS2_DIF_EXHASH) ? 723 GFS2_FORMAT_DE : 0); 724 str->di_depth = cpu_to_be16(ip->i_depth); 725 str->di_entries = cpu_to_be32(ip->i_entries); 726 727 str->di_eattr = cpu_to_be64(ip->i_eattr); 728 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); 729 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); 730 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); 731 } 732 733 /** 734 * gfs2_write_inode - Make sure the inode is stable on the disk 735 * @inode: The inode 736 * @wbc: The writeback control structure 737 * 738 * Returns: errno 739 */ 740 741 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) 742 { 743 struct gfs2_inode *ip = GFS2_I(inode); 744 struct gfs2_sbd *sdp = GFS2_SB(inode); 745 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 746 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host); 747 int ret = 0; 748 749 if (wbc->sync_mode == WB_SYNC_ALL) 750 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, NORMAL_FLUSH); 751 if (bdi->wb.dirty_exceeded) 752 gfs2_ail1_flush(sdp, wbc); 753 else 754 filemap_fdatawrite(metamapping); 755 if (wbc->sync_mode == WB_SYNC_ALL) 756 ret = filemap_fdatawait(metamapping); 757 if (ret) 758 mark_inode_dirty_sync(inode); 759 return ret; 760 } 761 762 /** 763 * gfs2_dirty_inode - check for atime updates 764 * @inode: The inode in question 765 * @flags: The type of dirty 766 * 767 * Unfortunately it can be called under any combination of inode 768 * glock and transaction lock, so we have to check carefully. 769 * 770 * At the moment this deals only with atime - it should be possible 771 * to expand that role in future, once a review of the locking has 772 * been carried out. 773 */ 774 775 static void gfs2_dirty_inode(struct inode *inode, int flags) 776 { 777 struct gfs2_inode *ip = GFS2_I(inode); 778 struct gfs2_sbd *sdp = GFS2_SB(inode); 779 struct buffer_head *bh; 780 struct gfs2_holder gh; 781 int need_unlock = 0; 782 int need_endtrans = 0; 783 int ret; 784 785 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC))) 786 return; 787 788 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { 789 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 790 if (ret) { 791 fs_err(sdp, "dirty_inode: glock %d\n", ret); 792 return; 793 } 794 need_unlock = 1; 795 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) 796 return; 797 798 if (current->journal_info == NULL) { 799 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 800 if (ret) { 801 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); 802 goto out; 803 } 804 need_endtrans = 1; 805 } 806 807 ret = gfs2_meta_inode_buffer(ip, &bh); 808 if (ret == 0) { 809 gfs2_trans_add_meta(ip->i_gl, bh); 810 gfs2_dinode_out(ip, bh->b_data); 811 brelse(bh); 812 } 813 814 if (need_endtrans) 815 gfs2_trans_end(sdp); 816 out: 817 if (need_unlock) 818 gfs2_glock_dq_uninit(&gh); 819 } 820 821 /** 822 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 823 * @sdp: the filesystem 824 * 825 * Returns: errno 826 */ 827 828 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp) 829 { 830 struct gfs2_holder freeze_gh; 831 int error; 832 833 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE, 834 &freeze_gh); 835 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 836 return error; 837 838 kthread_stop(sdp->sd_quotad_process); 839 kthread_stop(sdp->sd_logd_process); 840 841 flush_workqueue(gfs2_delete_workqueue); 842 gfs2_quota_sync(sdp->sd_vfs, 0); 843 gfs2_statfs_sync(sdp->sd_vfs, 0); 844 845 down_write(&sdp->sd_log_flush_lock); 846 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 847 up_write(&sdp->sd_log_flush_lock); 848 849 gfs2_log_flush(sdp, NULL, SHUTDOWN_FLUSH); 850 wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0); 851 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks); 852 853 if (freeze_gh.gh_gl) 854 gfs2_glock_dq_uninit(&freeze_gh); 855 856 gfs2_quota_cleanup(sdp); 857 858 return error; 859 } 860 861 /** 862 * gfs2_put_super - Unmount the filesystem 863 * @sb: The VFS superblock 864 * 865 */ 866 867 static void gfs2_put_super(struct super_block *sb) 868 { 869 struct gfs2_sbd *sdp = sb->s_fs_info; 870 int error; 871 struct gfs2_jdesc *jd; 872 873 /* No more recovery requests */ 874 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 875 smp_mb(); 876 877 /* Wait on outstanding recovery */ 878 restart: 879 spin_lock(&sdp->sd_jindex_spin); 880 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 881 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 882 continue; 883 spin_unlock(&sdp->sd_jindex_spin); 884 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 885 TASK_UNINTERRUPTIBLE); 886 goto restart; 887 } 888 spin_unlock(&sdp->sd_jindex_spin); 889 890 if (!(sb->s_flags & MS_RDONLY)) { 891 error = gfs2_make_fs_ro(sdp); 892 if (error) 893 gfs2_io_error(sdp); 894 } 895 /* At this point, we're through modifying the disk */ 896 897 /* Release stuff */ 898 899 iput(sdp->sd_jindex); 900 iput(sdp->sd_statfs_inode); 901 iput(sdp->sd_rindex); 902 iput(sdp->sd_quota_inode); 903 904 gfs2_glock_put(sdp->sd_rename_gl); 905 gfs2_glock_put(sdp->sd_freeze_gl); 906 907 if (!sdp->sd_args.ar_spectator) { 908 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 909 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 910 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 911 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 912 iput(sdp->sd_sc_inode); 913 iput(sdp->sd_qc_inode); 914 } 915 916 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 917 gfs2_clear_rgrpd(sdp); 918 gfs2_jindex_free(sdp); 919 /* Take apart glock structures and buffer lists */ 920 gfs2_gl_hash_clear(sdp); 921 /* Unmount the locking protocol */ 922 gfs2_lm_unmount(sdp); 923 924 /* At this point, we're through participating in the lockspace */ 925 gfs2_sys_fs_del(sdp); 926 } 927 928 /** 929 * gfs2_sync_fs - sync the filesystem 930 * @sb: the superblock 931 * 932 * Flushes the log to disk. 933 */ 934 935 static int gfs2_sync_fs(struct super_block *sb, int wait) 936 { 937 struct gfs2_sbd *sdp = sb->s_fs_info; 938 939 gfs2_quota_sync(sb, -1); 940 if (wait && sdp) 941 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH); 942 return 0; 943 } 944 945 void gfs2_freeze_func(struct work_struct *work) 946 { 947 int error; 948 struct gfs2_holder freeze_gh; 949 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work); 950 struct super_block *sb = sdp->sd_vfs; 951 952 atomic_inc(&sb->s_active); 953 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0, 954 &freeze_gh); 955 if (error) { 956 printk(KERN_INFO "GFS2: couln't get freeze lock : %d\n", error); 957 gfs2_assert_withdraw(sdp, 0); 958 } 959 else { 960 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 961 error = thaw_super(sb); 962 if (error) { 963 printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n", 964 error); 965 gfs2_assert_withdraw(sdp, 0); 966 } 967 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 968 freeze_gh.gh_flags |= GL_NOCACHE; 969 gfs2_glock_dq_uninit(&freeze_gh); 970 } 971 deactivate_super(sb); 972 return; 973 } 974 975 /** 976 * gfs2_freeze - prevent further writes to the filesystem 977 * @sb: the VFS structure for the filesystem 978 * 979 */ 980 981 static int gfs2_freeze(struct super_block *sb) 982 { 983 struct gfs2_sbd *sdp = sb->s_fs_info; 984 int error = 0; 985 986 mutex_lock(&sdp->sd_freeze_mutex); 987 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) 988 goto out; 989 990 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { 991 error = -EINVAL; 992 goto out; 993 } 994 995 for (;;) { 996 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); 997 if (!error) 998 break; 999 1000 switch (error) { 1001 case -EBUSY: 1002 fs_err(sdp, "waiting for recovery before freeze\n"); 1003 break; 1004 1005 default: 1006 fs_err(sdp, "error freezing FS: %d\n", error); 1007 break; 1008 } 1009 1010 fs_err(sdp, "retrying...\n"); 1011 msleep(1000); 1012 } 1013 error = 0; 1014 out: 1015 mutex_unlock(&sdp->sd_freeze_mutex); 1016 return error; 1017 } 1018 1019 /** 1020 * gfs2_unfreeze - reallow writes to the filesystem 1021 * @sb: the VFS structure for the filesystem 1022 * 1023 */ 1024 1025 static int gfs2_unfreeze(struct super_block *sb) 1026 { 1027 struct gfs2_sbd *sdp = sb->s_fs_info; 1028 1029 mutex_lock(&sdp->sd_freeze_mutex); 1030 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN || 1031 sdp->sd_freeze_gh.gh_gl == NULL) { 1032 mutex_unlock(&sdp->sd_freeze_mutex); 1033 return 0; 1034 } 1035 1036 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 1037 mutex_unlock(&sdp->sd_freeze_mutex); 1038 return 0; 1039 } 1040 1041 /** 1042 * statfs_fill - fill in the sg for a given RG 1043 * @rgd: the RG 1044 * @sc: the sc structure 1045 * 1046 * Returns: 0 on success, -ESTALE if the LVB is invalid 1047 */ 1048 1049 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 1050 struct gfs2_statfs_change_host *sc) 1051 { 1052 gfs2_rgrp_verify(rgd); 1053 sc->sc_total += rgd->rd_data; 1054 sc->sc_free += rgd->rd_free; 1055 sc->sc_dinodes += rgd->rd_dinodes; 1056 return 0; 1057 } 1058 1059 /** 1060 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 1061 * @sdp: the filesystem 1062 * @sc: the sc info that will be returned 1063 * 1064 * Any error (other than a signal) will cause this routine to fall back 1065 * to the synchronous version. 1066 * 1067 * FIXME: This really shouldn't busy wait like this. 1068 * 1069 * Returns: errno 1070 */ 1071 1072 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1073 { 1074 struct gfs2_rgrpd *rgd_next; 1075 struct gfs2_holder *gha, *gh; 1076 unsigned int slots = 64; 1077 unsigned int x; 1078 int done; 1079 int error = 0, err; 1080 1081 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 1082 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 1083 if (!gha) 1084 return -ENOMEM; 1085 1086 rgd_next = gfs2_rgrpd_get_first(sdp); 1087 1088 for (;;) { 1089 done = 1; 1090 1091 for (x = 0; x < slots; x++) { 1092 gh = gha + x; 1093 1094 if (gh->gh_gl && gfs2_glock_poll(gh)) { 1095 err = gfs2_glock_wait(gh); 1096 if (err) { 1097 gfs2_holder_uninit(gh); 1098 error = err; 1099 } else { 1100 if (!error) 1101 error = statfs_slow_fill( 1102 gh->gh_gl->gl_object, sc); 1103 gfs2_glock_dq_uninit(gh); 1104 } 1105 } 1106 1107 if (gh->gh_gl) 1108 done = 0; 1109 else if (rgd_next && !error) { 1110 error = gfs2_glock_nq_init(rgd_next->rd_gl, 1111 LM_ST_SHARED, 1112 GL_ASYNC, 1113 gh); 1114 rgd_next = gfs2_rgrpd_get_next(rgd_next); 1115 done = 0; 1116 } 1117 1118 if (signal_pending(current)) 1119 error = -ERESTARTSYS; 1120 } 1121 1122 if (done) 1123 break; 1124 1125 yield(); 1126 } 1127 1128 kfree(gha); 1129 return error; 1130 } 1131 1132 /** 1133 * gfs2_statfs_i - Do a statfs 1134 * @sdp: the filesystem 1135 * @sg: the sg structure 1136 * 1137 * Returns: errno 1138 */ 1139 1140 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1141 { 1142 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 1143 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 1144 1145 spin_lock(&sdp->sd_statfs_spin); 1146 1147 *sc = *m_sc; 1148 sc->sc_total += l_sc->sc_total; 1149 sc->sc_free += l_sc->sc_free; 1150 sc->sc_dinodes += l_sc->sc_dinodes; 1151 1152 spin_unlock(&sdp->sd_statfs_spin); 1153 1154 if (sc->sc_free < 0) 1155 sc->sc_free = 0; 1156 if (sc->sc_free > sc->sc_total) 1157 sc->sc_free = sc->sc_total; 1158 if (sc->sc_dinodes < 0) 1159 sc->sc_dinodes = 0; 1160 1161 return 0; 1162 } 1163 1164 /** 1165 * gfs2_statfs - Gather and return stats about the filesystem 1166 * @sb: The superblock 1167 * @statfsbuf: The buffer 1168 * 1169 * Returns: 0 on success or error code 1170 */ 1171 1172 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 1173 { 1174 struct super_block *sb = d_inode(dentry)->i_sb; 1175 struct gfs2_sbd *sdp = sb->s_fs_info; 1176 struct gfs2_statfs_change_host sc; 1177 int error; 1178 1179 error = gfs2_rindex_update(sdp); 1180 if (error) 1181 return error; 1182 1183 if (gfs2_tune_get(sdp, gt_statfs_slow)) 1184 error = gfs2_statfs_slow(sdp, &sc); 1185 else 1186 error = gfs2_statfs_i(sdp, &sc); 1187 1188 if (error) 1189 return error; 1190 1191 buf->f_type = GFS2_MAGIC; 1192 buf->f_bsize = sdp->sd_sb.sb_bsize; 1193 buf->f_blocks = sc.sc_total; 1194 buf->f_bfree = sc.sc_free; 1195 buf->f_bavail = sc.sc_free; 1196 buf->f_files = sc.sc_dinodes + sc.sc_free; 1197 buf->f_ffree = sc.sc_free; 1198 buf->f_namelen = GFS2_FNAMESIZE; 1199 1200 return 0; 1201 } 1202 1203 /** 1204 * gfs2_remount_fs - called when the FS is remounted 1205 * @sb: the filesystem 1206 * @flags: the remount flags 1207 * @data: extra data passed in (not used right now) 1208 * 1209 * Returns: errno 1210 */ 1211 1212 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) 1213 { 1214 struct gfs2_sbd *sdp = sb->s_fs_info; 1215 struct gfs2_args args = sdp->sd_args; /* Default to current settings */ 1216 struct gfs2_tune *gt = &sdp->sd_tune; 1217 int error; 1218 1219 sync_filesystem(sb); 1220 1221 spin_lock(>->gt_spin); 1222 args.ar_commit = gt->gt_logd_secs; 1223 args.ar_quota_quantum = gt->gt_quota_quantum; 1224 if (gt->gt_statfs_slow) 1225 args.ar_statfs_quantum = 0; 1226 else 1227 args.ar_statfs_quantum = gt->gt_statfs_quantum; 1228 spin_unlock(>->gt_spin); 1229 error = gfs2_mount_args(&args, data); 1230 if (error) 1231 return error; 1232 1233 /* Not allowed to change locking details */ 1234 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) || 1235 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) || 1236 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata)) 1237 return -EINVAL; 1238 1239 /* Some flags must not be changed */ 1240 if (args_neq(&args, &sdp->sd_args, spectator) || 1241 args_neq(&args, &sdp->sd_args, localflocks) || 1242 args_neq(&args, &sdp->sd_args, meta)) 1243 return -EINVAL; 1244 1245 if (sdp->sd_args.ar_spectator) 1246 *flags |= MS_RDONLY; 1247 1248 if ((sb->s_flags ^ *flags) & MS_RDONLY) { 1249 if (*flags & MS_RDONLY) 1250 error = gfs2_make_fs_ro(sdp); 1251 else 1252 error = gfs2_make_fs_rw(sdp); 1253 if (error) 1254 return error; 1255 } 1256 1257 sdp->sd_args = args; 1258 if (sdp->sd_args.ar_posix_acl) 1259 sb->s_flags |= MS_POSIXACL; 1260 else 1261 sb->s_flags &= ~MS_POSIXACL; 1262 if (sdp->sd_args.ar_nobarrier) 1263 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1264 else 1265 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1266 spin_lock(>->gt_spin); 1267 gt->gt_logd_secs = args.ar_commit; 1268 gt->gt_quota_quantum = args.ar_quota_quantum; 1269 if (args.ar_statfs_quantum) { 1270 gt->gt_statfs_slow = 0; 1271 gt->gt_statfs_quantum = args.ar_statfs_quantum; 1272 } 1273 else { 1274 gt->gt_statfs_slow = 1; 1275 gt->gt_statfs_quantum = 30; 1276 } 1277 spin_unlock(>->gt_spin); 1278 1279 gfs2_online_uevent(sdp); 1280 return 0; 1281 } 1282 1283 /** 1284 * gfs2_drop_inode - Drop an inode (test for remote unlink) 1285 * @inode: The inode to drop 1286 * 1287 * If we've received a callback on an iopen lock then its because a 1288 * remote node tried to deallocate the inode but failed due to this node 1289 * still having the inode open. Here we mark the link count zero 1290 * since we know that it must have reached zero if the GLF_DEMOTE flag 1291 * is set on the iopen glock. If we didn't do a disk read since the 1292 * remote node removed the final link then we might otherwise miss 1293 * this event. This check ensures that this node will deallocate the 1294 * inode's blocks, or alternatively pass the baton on to another 1295 * node for later deallocation. 1296 */ 1297 1298 static int gfs2_drop_inode(struct inode *inode) 1299 { 1300 struct gfs2_inode *ip = GFS2_I(inode); 1301 1302 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && inode->i_nlink) { 1303 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1304 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags)) 1305 clear_nlink(inode); 1306 } 1307 return generic_drop_inode(inode); 1308 } 1309 1310 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 1311 { 1312 do { 1313 if (d1 == d2) 1314 return 1; 1315 d1 = d1->d_parent; 1316 } while (!IS_ROOT(d1)); 1317 return 0; 1318 } 1319 1320 /** 1321 * gfs2_show_options - Show mount options for /proc/mounts 1322 * @s: seq_file structure 1323 * @root: root of this (sub)tree 1324 * 1325 * Returns: 0 on success or error code 1326 */ 1327 1328 static int gfs2_show_options(struct seq_file *s, struct dentry *root) 1329 { 1330 struct gfs2_sbd *sdp = root->d_sb->s_fs_info; 1331 struct gfs2_args *args = &sdp->sd_args; 1332 int val; 1333 1334 if (is_ancestor(root, sdp->sd_master_dir)) 1335 seq_puts(s, ",meta"); 1336 if (args->ar_lockproto[0]) 1337 seq_show_option(s, "lockproto", args->ar_lockproto); 1338 if (args->ar_locktable[0]) 1339 seq_show_option(s, "locktable", args->ar_locktable); 1340 if (args->ar_hostdata[0]) 1341 seq_show_option(s, "hostdata", args->ar_hostdata); 1342 if (args->ar_spectator) 1343 seq_puts(s, ",spectator"); 1344 if (args->ar_localflocks) 1345 seq_puts(s, ",localflocks"); 1346 if (args->ar_debug) 1347 seq_puts(s, ",debug"); 1348 if (args->ar_posix_acl) 1349 seq_puts(s, ",acl"); 1350 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 1351 char *state; 1352 switch (args->ar_quota) { 1353 case GFS2_QUOTA_OFF: 1354 state = "off"; 1355 break; 1356 case GFS2_QUOTA_ACCOUNT: 1357 state = "account"; 1358 break; 1359 case GFS2_QUOTA_ON: 1360 state = "on"; 1361 break; 1362 default: 1363 state = "unknown"; 1364 break; 1365 } 1366 seq_printf(s, ",quota=%s", state); 1367 } 1368 if (args->ar_suiddir) 1369 seq_puts(s, ",suiddir"); 1370 if (args->ar_data != GFS2_DATA_DEFAULT) { 1371 char *state; 1372 switch (args->ar_data) { 1373 case GFS2_DATA_WRITEBACK: 1374 state = "writeback"; 1375 break; 1376 case GFS2_DATA_ORDERED: 1377 state = "ordered"; 1378 break; 1379 default: 1380 state = "unknown"; 1381 break; 1382 } 1383 seq_printf(s, ",data=%s", state); 1384 } 1385 if (args->ar_discard) 1386 seq_puts(s, ",discard"); 1387 val = sdp->sd_tune.gt_logd_secs; 1388 if (val != 30) 1389 seq_printf(s, ",commit=%d", val); 1390 val = sdp->sd_tune.gt_statfs_quantum; 1391 if (val != 30) 1392 seq_printf(s, ",statfs_quantum=%d", val); 1393 else if (sdp->sd_tune.gt_statfs_slow) 1394 seq_puts(s, ",statfs_quantum=0"); 1395 val = sdp->sd_tune.gt_quota_quantum; 1396 if (val != 60) 1397 seq_printf(s, ",quota_quantum=%d", val); 1398 if (args->ar_statfs_percent) 1399 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1400 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1401 const char *state; 1402 1403 switch (args->ar_errors) { 1404 case GFS2_ERRORS_WITHDRAW: 1405 state = "withdraw"; 1406 break; 1407 case GFS2_ERRORS_PANIC: 1408 state = "panic"; 1409 break; 1410 default: 1411 state = "unknown"; 1412 break; 1413 } 1414 seq_printf(s, ",errors=%s", state); 1415 } 1416 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1417 seq_puts(s, ",nobarrier"); 1418 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1419 seq_puts(s, ",demote_interface_used"); 1420 if (args->ar_rgrplvb) 1421 seq_puts(s, ",rgrplvb"); 1422 return 0; 1423 } 1424 1425 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1426 { 1427 struct inode *inode = &ip->i_inode; 1428 struct gfs2_glock *gl = ip->i_gl; 1429 1430 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1431 truncate_inode_pages(&inode->i_data, 0); 1432 1433 if (atomic_read(&gl->gl_revokes) == 0) { 1434 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1435 clear_bit(GLF_DIRTY, &gl->gl_flags); 1436 } 1437 } 1438 1439 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1440 { 1441 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1442 struct gfs2_rgrpd *rgd; 1443 struct gfs2_holder gh; 1444 int error; 1445 1446 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1447 gfs2_consist_inode(ip); 1448 return -EIO; 1449 } 1450 1451 error = gfs2_rindex_update(sdp); 1452 if (error) 1453 return error; 1454 1455 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 1456 if (error) 1457 return error; 1458 1459 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1460 if (!rgd) { 1461 gfs2_consist_inode(ip); 1462 error = -EIO; 1463 goto out_qs; 1464 } 1465 1466 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh); 1467 if (error) 1468 goto out_qs; 1469 1470 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1471 sdp->sd_jdesc->jd_blocks); 1472 if (error) 1473 goto out_rg_gunlock; 1474 1475 gfs2_free_di(rgd, ip); 1476 1477 gfs2_final_release_pages(ip); 1478 1479 gfs2_trans_end(sdp); 1480 1481 out_rg_gunlock: 1482 gfs2_glock_dq_uninit(&gh); 1483 out_qs: 1484 gfs2_quota_unhold(ip); 1485 return error; 1486 } 1487 1488 /** 1489 * gfs2_evict_inode - Remove an inode from cache 1490 * @inode: The inode to evict 1491 * 1492 * There are three cases to consider: 1493 * 1. i_nlink == 0, we are final opener (and must deallocate) 1494 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1495 * 3. i_nlink > 0 1496 * 1497 * If the fs is read only, then we have to treat all cases as per #3 1498 * since we are unable to do any deallocation. The inode will be 1499 * deallocated by the next read/write node to attempt an allocation 1500 * in the same resource group 1501 * 1502 * We have to (at the moment) hold the inodes main lock to cover 1503 * the gap between unlocking the shared lock on the iopen lock and 1504 * taking the exclusive lock. I'd rather do a shared -> exclusive 1505 * conversion on the iopen lock, but we can change that later. This 1506 * is safe, just less efficient. 1507 */ 1508 1509 static void gfs2_evict_inode(struct inode *inode) 1510 { 1511 struct super_block *sb = inode->i_sb; 1512 struct gfs2_sbd *sdp = sb->s_fs_info; 1513 struct gfs2_inode *ip = GFS2_I(inode); 1514 struct gfs2_holder gh; 1515 int error; 1516 1517 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) { 1518 clear_inode(inode); 1519 return; 1520 } 1521 1522 if (inode->i_nlink || (sb->s_flags & MS_RDONLY)) 1523 goto out; 1524 1525 /* Must not read inode block until block type has been verified */ 1526 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 1527 if (unlikely(error)) { 1528 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1529 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1530 goto out; 1531 } 1532 1533 if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { 1534 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1535 if (error) 1536 goto out_truncate; 1537 } 1538 1539 if (test_bit(GIF_INVALID, &ip->i_flags)) { 1540 error = gfs2_inode_refresh(ip); 1541 if (error) 1542 goto out_truncate; 1543 } 1544 1545 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1546 gfs2_glock_dq_wait(&ip->i_iopen_gh); 1547 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh); 1548 error = gfs2_glock_nq(&ip->i_iopen_gh); 1549 if (error) 1550 goto out_truncate; 1551 1552 /* Case 1 starts here */ 1553 1554 if (S_ISDIR(inode->i_mode) && 1555 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1556 error = gfs2_dir_exhash_dealloc(ip); 1557 if (error) 1558 goto out_unlock; 1559 } 1560 1561 if (ip->i_eattr) { 1562 error = gfs2_ea_dealloc(ip); 1563 if (error) 1564 goto out_unlock; 1565 } 1566 1567 if (!gfs2_is_stuffed(ip)) { 1568 error = gfs2_file_dealloc(ip); 1569 if (error) 1570 goto out_unlock; 1571 } 1572 1573 error = gfs2_dinode_dealloc(ip); 1574 goto out_unlock; 1575 1576 out_truncate: 1577 gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH); 1578 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1579 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 1580 filemap_fdatawrite(metamapping); 1581 filemap_fdatawait(metamapping); 1582 } 1583 write_inode_now(inode, 1); 1584 gfs2_ail_flush(ip->i_gl, 0); 1585 1586 /* Case 2 starts here */ 1587 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1588 if (error) 1589 goto out_unlock; 1590 /* Needs to be done before glock release & also in a transaction */ 1591 truncate_inode_pages(&inode->i_data, 0); 1592 gfs2_trans_end(sdp); 1593 1594 out_unlock: 1595 /* Error path for case 1 */ 1596 if (gfs2_rs_active(ip->i_res)) 1597 gfs2_rs_deltree(ip->i_res); 1598 1599 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1600 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1601 gfs2_glock_dq(&ip->i_iopen_gh); 1602 } 1603 gfs2_holder_uninit(&ip->i_iopen_gh); 1604 gfs2_glock_dq_uninit(&gh); 1605 if (error && error != GLR_TRYFAILED && error != -EROFS) 1606 fs_warn(sdp, "gfs2_evict_inode: %d\n", error); 1607 out: 1608 /* Case 3 starts here */ 1609 truncate_inode_pages_final(&inode->i_data); 1610 gfs2_rs_delete(ip, NULL); 1611 gfs2_ordered_del_inode(ip); 1612 clear_inode(inode); 1613 gfs2_dir_hash_inval(ip); 1614 ip->i_gl->gl_object = NULL; 1615 flush_delayed_work(&ip->i_gl->gl_work); 1616 gfs2_glock_add_to_lru(ip->i_gl); 1617 gfs2_glock_put(ip->i_gl); 1618 ip->i_gl = NULL; 1619 if (ip->i_iopen_gh.gh_gl) { 1620 ip->i_iopen_gh.gh_gl->gl_object = NULL; 1621 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1622 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1623 } 1624 } 1625 1626 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1627 { 1628 struct gfs2_inode *ip; 1629 1630 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1631 if (ip) { 1632 ip->i_flags = 0; 1633 ip->i_gl = NULL; 1634 ip->i_rgd = NULL; 1635 ip->i_res = NULL; 1636 } 1637 return &ip->i_inode; 1638 } 1639 1640 static void gfs2_i_callback(struct rcu_head *head) 1641 { 1642 struct inode *inode = container_of(head, struct inode, i_rcu); 1643 kmem_cache_free(gfs2_inode_cachep, inode); 1644 } 1645 1646 static void gfs2_destroy_inode(struct inode *inode) 1647 { 1648 call_rcu(&inode->i_rcu, gfs2_i_callback); 1649 } 1650 1651 const struct super_operations gfs2_super_ops = { 1652 .alloc_inode = gfs2_alloc_inode, 1653 .destroy_inode = gfs2_destroy_inode, 1654 .write_inode = gfs2_write_inode, 1655 .dirty_inode = gfs2_dirty_inode, 1656 .evict_inode = gfs2_evict_inode, 1657 .put_super = gfs2_put_super, 1658 .sync_fs = gfs2_sync_fs, 1659 .freeze_super = gfs2_freeze, 1660 .thaw_super = gfs2_unfreeze, 1661 .statfs = gfs2_statfs, 1662 .remount_fs = gfs2_remount_fs, 1663 .drop_inode = gfs2_drop_inode, 1664 .show_options = gfs2_show_options, 1665 }; 1666 1667