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/signal.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 #include "lops.h" 49 50 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x) 51 52 enum { 53 Opt_lockproto, 54 Opt_locktable, 55 Opt_hostdata, 56 Opt_spectator, 57 Opt_ignore_local_fs, 58 Opt_localflocks, 59 Opt_localcaching, 60 Opt_debug, 61 Opt_nodebug, 62 Opt_upgrade, 63 Opt_acl, 64 Opt_noacl, 65 Opt_quota_off, 66 Opt_quota_account, 67 Opt_quota_on, 68 Opt_quota, 69 Opt_noquota, 70 Opt_suiddir, 71 Opt_nosuiddir, 72 Opt_data_writeback, 73 Opt_data_ordered, 74 Opt_meta, 75 Opt_discard, 76 Opt_nodiscard, 77 Opt_commit, 78 Opt_err_withdraw, 79 Opt_err_panic, 80 Opt_statfs_quantum, 81 Opt_statfs_percent, 82 Opt_quota_quantum, 83 Opt_barrier, 84 Opt_nobarrier, 85 Opt_rgrplvb, 86 Opt_norgrplvb, 87 Opt_loccookie, 88 Opt_noloccookie, 89 Opt_error, 90 }; 91 92 static const match_table_t tokens = { 93 {Opt_lockproto, "lockproto=%s"}, 94 {Opt_locktable, "locktable=%s"}, 95 {Opt_hostdata, "hostdata=%s"}, 96 {Opt_spectator, "spectator"}, 97 {Opt_spectator, "norecovery"}, 98 {Opt_ignore_local_fs, "ignore_local_fs"}, 99 {Opt_localflocks, "localflocks"}, 100 {Opt_localcaching, "localcaching"}, 101 {Opt_debug, "debug"}, 102 {Opt_nodebug, "nodebug"}, 103 {Opt_upgrade, "upgrade"}, 104 {Opt_acl, "acl"}, 105 {Opt_noacl, "noacl"}, 106 {Opt_quota_off, "quota=off"}, 107 {Opt_quota_account, "quota=account"}, 108 {Opt_quota_on, "quota=on"}, 109 {Opt_quota, "quota"}, 110 {Opt_noquota, "noquota"}, 111 {Opt_suiddir, "suiddir"}, 112 {Opt_nosuiddir, "nosuiddir"}, 113 {Opt_data_writeback, "data=writeback"}, 114 {Opt_data_ordered, "data=ordered"}, 115 {Opt_meta, "meta"}, 116 {Opt_discard, "discard"}, 117 {Opt_nodiscard, "nodiscard"}, 118 {Opt_commit, "commit=%d"}, 119 {Opt_err_withdraw, "errors=withdraw"}, 120 {Opt_err_panic, "errors=panic"}, 121 {Opt_statfs_quantum, "statfs_quantum=%d"}, 122 {Opt_statfs_percent, "statfs_percent=%d"}, 123 {Opt_quota_quantum, "quota_quantum=%d"}, 124 {Opt_barrier, "barrier"}, 125 {Opt_nobarrier, "nobarrier"}, 126 {Opt_rgrplvb, "rgrplvb"}, 127 {Opt_norgrplvb, "norgrplvb"}, 128 {Opt_loccookie, "loccookie"}, 129 {Opt_noloccookie, "noloccookie"}, 130 {Opt_error, NULL} 131 }; 132 133 /** 134 * gfs2_mount_args - Parse mount options 135 * @args: The structure into which the parsed options will be written 136 * @options: The options to parse 137 * 138 * Return: errno 139 */ 140 141 int gfs2_mount_args(struct gfs2_args *args, char *options) 142 { 143 char *o; 144 int token; 145 substring_t tmp[MAX_OPT_ARGS]; 146 int rv; 147 148 /* Split the options into tokens with the "," character and 149 process them */ 150 151 while (1) { 152 o = strsep(&options, ","); 153 if (o == NULL) 154 break; 155 if (*o == '\0') 156 continue; 157 158 token = match_token(o, tokens, tmp); 159 switch (token) { 160 case Opt_lockproto: 161 match_strlcpy(args->ar_lockproto, &tmp[0], 162 GFS2_LOCKNAME_LEN); 163 break; 164 case Opt_locktable: 165 match_strlcpy(args->ar_locktable, &tmp[0], 166 GFS2_LOCKNAME_LEN); 167 break; 168 case Opt_hostdata: 169 match_strlcpy(args->ar_hostdata, &tmp[0], 170 GFS2_LOCKNAME_LEN); 171 break; 172 case Opt_spectator: 173 args->ar_spectator = 1; 174 break; 175 case Opt_ignore_local_fs: 176 /* Retained for backwards compat only */ 177 break; 178 case Opt_localflocks: 179 args->ar_localflocks = 1; 180 break; 181 case Opt_localcaching: 182 /* Retained for backwards compat only */ 183 break; 184 case Opt_debug: 185 if (args->ar_errors == GFS2_ERRORS_PANIC) { 186 pr_warn("-o debug and -o errors=panic are mutually exclusive\n"); 187 return -EINVAL; 188 } 189 args->ar_debug = 1; 190 break; 191 case Opt_nodebug: 192 args->ar_debug = 0; 193 break; 194 case Opt_upgrade: 195 /* Retained for backwards compat only */ 196 break; 197 case Opt_acl: 198 args->ar_posix_acl = 1; 199 break; 200 case Opt_noacl: 201 args->ar_posix_acl = 0; 202 break; 203 case Opt_quota_off: 204 case Opt_noquota: 205 args->ar_quota = GFS2_QUOTA_OFF; 206 break; 207 case Opt_quota_account: 208 args->ar_quota = GFS2_QUOTA_ACCOUNT; 209 break; 210 case Opt_quota_on: 211 case Opt_quota: 212 args->ar_quota = GFS2_QUOTA_ON; 213 break; 214 case Opt_suiddir: 215 args->ar_suiddir = 1; 216 break; 217 case Opt_nosuiddir: 218 args->ar_suiddir = 0; 219 break; 220 case Opt_data_writeback: 221 args->ar_data = GFS2_DATA_WRITEBACK; 222 break; 223 case Opt_data_ordered: 224 args->ar_data = GFS2_DATA_ORDERED; 225 break; 226 case Opt_meta: 227 args->ar_meta = 1; 228 break; 229 case Opt_discard: 230 args->ar_discard = 1; 231 break; 232 case Opt_nodiscard: 233 args->ar_discard = 0; 234 break; 235 case Opt_commit: 236 rv = match_int(&tmp[0], &args->ar_commit); 237 if (rv || args->ar_commit <= 0) { 238 pr_warn("commit mount option requires a positive numeric argument\n"); 239 return rv ? rv : -EINVAL; 240 } 241 break; 242 case Opt_statfs_quantum: 243 rv = match_int(&tmp[0], &args->ar_statfs_quantum); 244 if (rv || args->ar_statfs_quantum < 0) { 245 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n"); 246 return rv ? rv : -EINVAL; 247 } 248 break; 249 case Opt_quota_quantum: 250 rv = match_int(&tmp[0], &args->ar_quota_quantum); 251 if (rv || args->ar_quota_quantum <= 0) { 252 pr_warn("quota_quantum mount option requires a positive numeric argument\n"); 253 return rv ? rv : -EINVAL; 254 } 255 break; 256 case Opt_statfs_percent: 257 rv = match_int(&tmp[0], &args->ar_statfs_percent); 258 if (rv || args->ar_statfs_percent < 0 || 259 args->ar_statfs_percent > 100) { 260 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n"); 261 return rv ? rv : -EINVAL; 262 } 263 break; 264 case Opt_err_withdraw: 265 args->ar_errors = GFS2_ERRORS_WITHDRAW; 266 break; 267 case Opt_err_panic: 268 if (args->ar_debug) { 269 pr_warn("-o debug and -o errors=panic are mutually exclusive\n"); 270 return -EINVAL; 271 } 272 args->ar_errors = GFS2_ERRORS_PANIC; 273 break; 274 case Opt_barrier: 275 args->ar_nobarrier = 0; 276 break; 277 case Opt_nobarrier: 278 args->ar_nobarrier = 1; 279 break; 280 case Opt_rgrplvb: 281 args->ar_rgrplvb = 1; 282 break; 283 case Opt_norgrplvb: 284 args->ar_rgrplvb = 0; 285 break; 286 case Opt_loccookie: 287 args->ar_loccookie = 1; 288 break; 289 case Opt_noloccookie: 290 args->ar_loccookie = 0; 291 break; 292 case Opt_error: 293 default: 294 pr_warn("invalid mount option: %s\n", o); 295 return -EINVAL; 296 } 297 } 298 299 return 0; 300 } 301 302 /** 303 * gfs2_jindex_free - Clear all the journal index information 304 * @sdp: The GFS2 superblock 305 * 306 */ 307 308 void gfs2_jindex_free(struct gfs2_sbd *sdp) 309 { 310 struct list_head list; 311 struct gfs2_jdesc *jd; 312 313 spin_lock(&sdp->sd_jindex_spin); 314 list_add(&list, &sdp->sd_jindex_list); 315 list_del_init(&sdp->sd_jindex_list); 316 sdp->sd_journals = 0; 317 spin_unlock(&sdp->sd_jindex_spin); 318 319 while (!list_empty(&list)) { 320 jd = list_entry(list.next, struct gfs2_jdesc, jd_list); 321 gfs2_free_journal_extents(jd); 322 list_del(&jd->jd_list); 323 iput(jd->jd_inode); 324 kfree(jd); 325 } 326 } 327 328 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) 329 { 330 struct gfs2_jdesc *jd; 331 int found = 0; 332 333 list_for_each_entry(jd, head, jd_list) { 334 if (jd->jd_jid == jid) { 335 found = 1; 336 break; 337 } 338 } 339 340 if (!found) 341 jd = NULL; 342 343 return jd; 344 } 345 346 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) 347 { 348 struct gfs2_jdesc *jd; 349 350 spin_lock(&sdp->sd_jindex_spin); 351 jd = jdesc_find_i(&sdp->sd_jindex_list, jid); 352 spin_unlock(&sdp->sd_jindex_spin); 353 354 return jd; 355 } 356 357 int gfs2_jdesc_check(struct gfs2_jdesc *jd) 358 { 359 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 360 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 361 u64 size = i_size_read(jd->jd_inode); 362 363 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30))) 364 return -EIO; 365 366 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift; 367 368 if (gfs2_write_alloc_required(ip, 0, size)) { 369 gfs2_consist_inode(ip); 370 return -EIO; 371 } 372 373 return 0; 374 } 375 376 static int init_threads(struct gfs2_sbd *sdp) 377 { 378 struct task_struct *p; 379 int error = 0; 380 381 p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); 382 if (IS_ERR(p)) { 383 error = PTR_ERR(p); 384 fs_err(sdp, "can't start logd thread: %d\n", error); 385 return error; 386 } 387 sdp->sd_logd_process = p; 388 389 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); 390 if (IS_ERR(p)) { 391 error = PTR_ERR(p); 392 fs_err(sdp, "can't start quotad thread: %d\n", error); 393 goto fail; 394 } 395 sdp->sd_quotad_process = p; 396 return 0; 397 398 fail: 399 kthread_stop(sdp->sd_logd_process); 400 return error; 401 } 402 403 /** 404 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one 405 * @sdp: the filesystem 406 * 407 * Returns: errno 408 */ 409 410 int gfs2_make_fs_rw(struct gfs2_sbd *sdp) 411 { 412 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 413 struct gfs2_glock *j_gl = ip->i_gl; 414 struct gfs2_holder freeze_gh; 415 struct gfs2_log_header_host head; 416 int error; 417 418 error = init_threads(sdp); 419 if (error) 420 return error; 421 422 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0, 423 &freeze_gh); 424 if (error) 425 goto fail_threads; 426 427 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 428 429 error = gfs2_find_jhead(sdp->sd_jdesc, &head); 430 if (error) 431 goto fail; 432 433 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 434 gfs2_consist(sdp); 435 error = -EIO; 436 goto fail; 437 } 438 439 /* Initialize some head of the log stuff */ 440 sdp->sd_log_sequence = head.lh_sequence + 1; 441 gfs2_log_pointers_init(sdp, head.lh_blkno); 442 443 error = gfs2_quota_init(sdp); 444 if (error) 445 goto fail; 446 447 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 448 449 gfs2_glock_dq_uninit(&freeze_gh); 450 451 return 0; 452 453 fail: 454 freeze_gh.gh_flags |= GL_NOCACHE; 455 gfs2_glock_dq_uninit(&freeze_gh); 456 fail_threads: 457 kthread_stop(sdp->sd_quotad_process); 458 kthread_stop(sdp->sd_logd_process); 459 return error; 460 } 461 462 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) 463 { 464 const struct gfs2_statfs_change *str = buf; 465 466 sc->sc_total = be64_to_cpu(str->sc_total); 467 sc->sc_free = be64_to_cpu(str->sc_free); 468 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); 469 } 470 471 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) 472 { 473 struct gfs2_statfs_change *str = buf; 474 475 str->sc_total = cpu_to_be64(sc->sc_total); 476 str->sc_free = cpu_to_be64(sc->sc_free); 477 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); 478 } 479 480 int gfs2_statfs_init(struct gfs2_sbd *sdp) 481 { 482 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 483 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 484 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 485 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 486 struct buffer_head *m_bh, *l_bh; 487 struct gfs2_holder gh; 488 int error; 489 490 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 491 &gh); 492 if (error) 493 return error; 494 495 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 496 if (error) 497 goto out; 498 499 if (sdp->sd_args.ar_spectator) { 500 spin_lock(&sdp->sd_statfs_spin); 501 gfs2_statfs_change_in(m_sc, m_bh->b_data + 502 sizeof(struct gfs2_dinode)); 503 spin_unlock(&sdp->sd_statfs_spin); 504 } else { 505 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 506 if (error) 507 goto out_m_bh; 508 509 spin_lock(&sdp->sd_statfs_spin); 510 gfs2_statfs_change_in(m_sc, m_bh->b_data + 511 sizeof(struct gfs2_dinode)); 512 gfs2_statfs_change_in(l_sc, l_bh->b_data + 513 sizeof(struct gfs2_dinode)); 514 spin_unlock(&sdp->sd_statfs_spin); 515 516 brelse(l_bh); 517 } 518 519 out_m_bh: 520 brelse(m_bh); 521 out: 522 gfs2_glock_dq_uninit(&gh); 523 return 0; 524 } 525 526 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, 527 s64 dinodes) 528 { 529 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 530 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 531 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 532 struct buffer_head *l_bh; 533 s64 x, y; 534 int need_sync = 0; 535 int error; 536 537 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 538 if (error) 539 return; 540 541 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 542 543 spin_lock(&sdp->sd_statfs_spin); 544 l_sc->sc_total += total; 545 l_sc->sc_free += free; 546 l_sc->sc_dinodes += dinodes; 547 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); 548 if (sdp->sd_args.ar_statfs_percent) { 549 x = 100 * l_sc->sc_free; 550 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent; 551 if (x >= y || x <= -y) 552 need_sync = 1; 553 } 554 spin_unlock(&sdp->sd_statfs_spin); 555 556 brelse(l_bh); 557 if (need_sync) 558 gfs2_wake_up_statfs(sdp); 559 } 560 561 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh, 562 struct buffer_head *l_bh) 563 { 564 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 565 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 566 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 567 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 568 569 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 570 gfs2_trans_add_meta(m_ip->i_gl, m_bh); 571 572 spin_lock(&sdp->sd_statfs_spin); 573 m_sc->sc_total += l_sc->sc_total; 574 m_sc->sc_free += l_sc->sc_free; 575 m_sc->sc_dinodes += l_sc->sc_dinodes; 576 memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); 577 memset(l_bh->b_data + sizeof(struct gfs2_dinode), 578 0, sizeof(struct gfs2_statfs_change)); 579 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); 580 spin_unlock(&sdp->sd_statfs_spin); 581 } 582 583 int gfs2_statfs_sync(struct super_block *sb, int type) 584 { 585 struct gfs2_sbd *sdp = sb->s_fs_info; 586 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 587 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 588 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 589 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 590 struct gfs2_holder gh; 591 struct buffer_head *m_bh, *l_bh; 592 int error; 593 594 sb_start_write(sb); 595 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 596 &gh); 597 if (error) 598 goto out; 599 600 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 601 if (error) 602 goto out_unlock; 603 604 spin_lock(&sdp->sd_statfs_spin); 605 gfs2_statfs_change_in(m_sc, m_bh->b_data + 606 sizeof(struct gfs2_dinode)); 607 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { 608 spin_unlock(&sdp->sd_statfs_spin); 609 goto out_bh; 610 } 611 spin_unlock(&sdp->sd_statfs_spin); 612 613 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 614 if (error) 615 goto out_bh; 616 617 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 618 if (error) 619 goto out_bh2; 620 621 update_statfs(sdp, m_bh, l_bh); 622 sdp->sd_statfs_force_sync = 0; 623 624 gfs2_trans_end(sdp); 625 626 out_bh2: 627 brelse(l_bh); 628 out_bh: 629 brelse(m_bh); 630 out_unlock: 631 gfs2_glock_dq_uninit(&gh); 632 out: 633 sb_end_write(sb); 634 return error; 635 } 636 637 struct lfcc { 638 struct list_head list; 639 struct gfs2_holder gh; 640 }; 641 642 /** 643 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all 644 * journals are clean 645 * @sdp: the file system 646 * @state: the state to put the transaction lock into 647 * @t_gh: the hold on the transaction lock 648 * 649 * Returns: errno 650 */ 651 652 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, 653 struct gfs2_holder *freeze_gh) 654 { 655 struct gfs2_inode *ip; 656 struct gfs2_jdesc *jd; 657 struct lfcc *lfcc; 658 LIST_HEAD(list); 659 struct gfs2_log_header_host lh; 660 int error; 661 662 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 663 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); 664 if (!lfcc) { 665 error = -ENOMEM; 666 goto out; 667 } 668 ip = GFS2_I(jd->jd_inode); 669 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); 670 if (error) { 671 kfree(lfcc); 672 goto out; 673 } 674 list_add(&lfcc->list, &list); 675 } 676 677 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE, 678 GL_NOCACHE, freeze_gh); 679 680 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 681 error = gfs2_jdesc_check(jd); 682 if (error) 683 break; 684 error = gfs2_find_jhead(jd, &lh); 685 if (error) 686 break; 687 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 688 error = -EBUSY; 689 break; 690 } 691 } 692 693 if (error) 694 gfs2_glock_dq_uninit(freeze_gh); 695 696 out: 697 while (!list_empty(&list)) { 698 lfcc = list_entry(list.next, struct lfcc, list); 699 list_del(&lfcc->list); 700 gfs2_glock_dq_uninit(&lfcc->gh); 701 kfree(lfcc); 702 } 703 return error; 704 } 705 706 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 707 { 708 struct gfs2_dinode *str = buf; 709 710 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 711 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); 712 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); 713 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); 714 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); 715 str->di_mode = cpu_to_be32(ip->i_inode.i_mode); 716 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode)); 717 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode)); 718 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); 719 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode)); 720 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); 721 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 722 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); 723 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); 724 725 str->di_goal_meta = cpu_to_be64(ip->i_goal); 726 str->di_goal_data = cpu_to_be64(ip->i_goal); 727 str->di_generation = cpu_to_be64(ip->i_generation); 728 729 str->di_flags = cpu_to_be32(ip->i_diskflags); 730 str->di_height = cpu_to_be16(ip->i_height); 731 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && 732 !(ip->i_diskflags & GFS2_DIF_EXHASH) ? 733 GFS2_FORMAT_DE : 0); 734 str->di_depth = cpu_to_be16(ip->i_depth); 735 str->di_entries = cpu_to_be32(ip->i_entries); 736 737 str->di_eattr = cpu_to_be64(ip->i_eattr); 738 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); 739 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); 740 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); 741 } 742 743 /** 744 * gfs2_write_inode - Make sure the inode is stable on the disk 745 * @inode: The inode 746 * @wbc: The writeback control structure 747 * 748 * Returns: errno 749 */ 750 751 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) 752 { 753 struct gfs2_inode *ip = GFS2_I(inode); 754 struct gfs2_sbd *sdp = GFS2_SB(inode); 755 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 756 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host); 757 int ret = 0; 758 bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip)); 759 760 if (flush_all) 761 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, 762 GFS2_LOG_HEAD_FLUSH_NORMAL | 763 GFS2_LFC_WRITE_INODE); 764 if (bdi->wb.dirty_exceeded) 765 gfs2_ail1_flush(sdp, wbc); 766 else 767 filemap_fdatawrite(metamapping); 768 if (flush_all) 769 ret = filemap_fdatawait(metamapping); 770 if (ret) 771 mark_inode_dirty_sync(inode); 772 else { 773 spin_lock(&inode->i_lock); 774 if (!(inode->i_flags & I_DIRTY)) 775 gfs2_ordered_del_inode(ip); 776 spin_unlock(&inode->i_lock); 777 } 778 return ret; 779 } 780 781 /** 782 * gfs2_dirty_inode - check for atime updates 783 * @inode: The inode in question 784 * @flags: The type of dirty 785 * 786 * Unfortunately it can be called under any combination of inode 787 * glock and transaction lock, so we have to check carefully. 788 * 789 * At the moment this deals only with atime - it should be possible 790 * to expand that role in future, once a review of the locking has 791 * been carried out. 792 */ 793 794 static void gfs2_dirty_inode(struct inode *inode, int flags) 795 { 796 struct gfs2_inode *ip = GFS2_I(inode); 797 struct gfs2_sbd *sdp = GFS2_SB(inode); 798 struct buffer_head *bh; 799 struct gfs2_holder gh; 800 int need_unlock = 0; 801 int need_endtrans = 0; 802 int ret; 803 804 if (!(flags & I_DIRTY_INODE)) 805 return; 806 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 807 return; 808 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { 809 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 810 if (ret) { 811 fs_err(sdp, "dirty_inode: glock %d\n", ret); 812 return; 813 } 814 need_unlock = 1; 815 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) 816 return; 817 818 if (current->journal_info == NULL) { 819 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 820 if (ret) { 821 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); 822 goto out; 823 } 824 need_endtrans = 1; 825 } 826 827 ret = gfs2_meta_inode_buffer(ip, &bh); 828 if (ret == 0) { 829 gfs2_trans_add_meta(ip->i_gl, bh); 830 gfs2_dinode_out(ip, bh->b_data); 831 brelse(bh); 832 } 833 834 if (need_endtrans) 835 gfs2_trans_end(sdp); 836 out: 837 if (need_unlock) 838 gfs2_glock_dq_uninit(&gh); 839 } 840 841 /** 842 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 843 * @sdp: the filesystem 844 * 845 * Returns: errno 846 */ 847 848 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp) 849 { 850 struct gfs2_holder freeze_gh; 851 int error; 852 853 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE, 854 &freeze_gh); 855 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 856 return error; 857 858 flush_workqueue(gfs2_delete_workqueue); 859 kthread_stop(sdp->sd_quotad_process); 860 kthread_stop(sdp->sd_logd_process); 861 862 gfs2_quota_sync(sdp->sd_vfs, 0); 863 gfs2_statfs_sync(sdp->sd_vfs, 0); 864 865 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN | 866 GFS2_LFC_MAKE_FS_RO); 867 wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0); 868 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks); 869 870 if (gfs2_holder_initialized(&freeze_gh)) 871 gfs2_glock_dq_uninit(&freeze_gh); 872 873 gfs2_quota_cleanup(sdp); 874 875 return error; 876 } 877 878 /** 879 * gfs2_put_super - Unmount the filesystem 880 * @sb: The VFS superblock 881 * 882 */ 883 884 static void gfs2_put_super(struct super_block *sb) 885 { 886 struct gfs2_sbd *sdp = sb->s_fs_info; 887 int error; 888 struct gfs2_jdesc *jd; 889 890 /* No more recovery requests */ 891 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 892 smp_mb(); 893 894 /* Wait on outstanding recovery */ 895 restart: 896 spin_lock(&sdp->sd_jindex_spin); 897 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 898 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 899 continue; 900 spin_unlock(&sdp->sd_jindex_spin); 901 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 902 TASK_UNINTERRUPTIBLE); 903 goto restart; 904 } 905 spin_unlock(&sdp->sd_jindex_spin); 906 907 if (!sb_rdonly(sb)) { 908 error = gfs2_make_fs_ro(sdp); 909 if (error) 910 gfs2_io_error(sdp); 911 } 912 /* At this point, we're through modifying the disk */ 913 914 /* Release stuff */ 915 916 iput(sdp->sd_jindex); 917 iput(sdp->sd_statfs_inode); 918 iput(sdp->sd_rindex); 919 iput(sdp->sd_quota_inode); 920 921 gfs2_glock_put(sdp->sd_rename_gl); 922 gfs2_glock_put(sdp->sd_freeze_gl); 923 924 if (!sdp->sd_args.ar_spectator) { 925 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 926 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 927 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 928 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 929 iput(sdp->sd_sc_inode); 930 iput(sdp->sd_qc_inode); 931 } 932 933 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 934 gfs2_clear_rgrpd(sdp); 935 gfs2_jindex_free(sdp); 936 /* Take apart glock structures and buffer lists */ 937 gfs2_gl_hash_clear(sdp); 938 gfs2_delete_debugfs_file(sdp); 939 /* Unmount the locking protocol */ 940 gfs2_lm_unmount(sdp); 941 942 /* At this point, we're through participating in the lockspace */ 943 gfs2_sys_fs_del(sdp); 944 } 945 946 /** 947 * gfs2_sync_fs - sync the filesystem 948 * @sb: the superblock 949 * 950 * Flushes the log to disk. 951 */ 952 953 static int gfs2_sync_fs(struct super_block *sb, int wait) 954 { 955 struct gfs2_sbd *sdp = sb->s_fs_info; 956 957 gfs2_quota_sync(sb, -1); 958 if (wait) 959 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 960 GFS2_LFC_SYNC_FS); 961 return sdp->sd_log_error; 962 } 963 964 void gfs2_freeze_func(struct work_struct *work) 965 { 966 int error; 967 struct gfs2_holder freeze_gh; 968 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work); 969 struct super_block *sb = sdp->sd_vfs; 970 971 atomic_inc(&sb->s_active); 972 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0, 973 &freeze_gh); 974 if (error) { 975 printk(KERN_INFO "GFS2: couldn't get freeze lock : %d\n", error); 976 gfs2_assert_withdraw(sdp, 0); 977 } 978 else { 979 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 980 error = thaw_super(sb); 981 if (error) { 982 printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n", 983 error); 984 gfs2_assert_withdraw(sdp, 0); 985 } 986 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 987 freeze_gh.gh_flags |= GL_NOCACHE; 988 gfs2_glock_dq_uninit(&freeze_gh); 989 } 990 deactivate_super(sb); 991 return; 992 } 993 994 /** 995 * gfs2_freeze - prevent further writes to the filesystem 996 * @sb: the VFS structure for the filesystem 997 * 998 */ 999 1000 static int gfs2_freeze(struct super_block *sb) 1001 { 1002 struct gfs2_sbd *sdp = sb->s_fs_info; 1003 int error = 0; 1004 1005 mutex_lock(&sdp->sd_freeze_mutex); 1006 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) 1007 goto out; 1008 1009 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { 1010 error = -EINVAL; 1011 goto out; 1012 } 1013 1014 for (;;) { 1015 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); 1016 if (!error) 1017 break; 1018 1019 switch (error) { 1020 case -EBUSY: 1021 fs_err(sdp, "waiting for recovery before freeze\n"); 1022 break; 1023 1024 default: 1025 fs_err(sdp, "error freezing FS: %d\n", error); 1026 break; 1027 } 1028 1029 fs_err(sdp, "retrying...\n"); 1030 msleep(1000); 1031 } 1032 error = 0; 1033 out: 1034 mutex_unlock(&sdp->sd_freeze_mutex); 1035 return error; 1036 } 1037 1038 /** 1039 * gfs2_unfreeze - reallow writes to the filesystem 1040 * @sb: the VFS structure for the filesystem 1041 * 1042 */ 1043 1044 static int gfs2_unfreeze(struct super_block *sb) 1045 { 1046 struct gfs2_sbd *sdp = sb->s_fs_info; 1047 1048 mutex_lock(&sdp->sd_freeze_mutex); 1049 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN || 1050 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) { 1051 mutex_unlock(&sdp->sd_freeze_mutex); 1052 return 0; 1053 } 1054 1055 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 1056 mutex_unlock(&sdp->sd_freeze_mutex); 1057 return 0; 1058 } 1059 1060 /** 1061 * statfs_fill - fill in the sg for a given RG 1062 * @rgd: the RG 1063 * @sc: the sc structure 1064 * 1065 * Returns: 0 on success, -ESTALE if the LVB is invalid 1066 */ 1067 1068 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 1069 struct gfs2_statfs_change_host *sc) 1070 { 1071 gfs2_rgrp_verify(rgd); 1072 sc->sc_total += rgd->rd_data; 1073 sc->sc_free += rgd->rd_free; 1074 sc->sc_dinodes += rgd->rd_dinodes; 1075 return 0; 1076 } 1077 1078 /** 1079 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 1080 * @sdp: the filesystem 1081 * @sc: the sc info that will be returned 1082 * 1083 * Any error (other than a signal) will cause this routine to fall back 1084 * to the synchronous version. 1085 * 1086 * FIXME: This really shouldn't busy wait like this. 1087 * 1088 * Returns: errno 1089 */ 1090 1091 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1092 { 1093 struct gfs2_rgrpd *rgd_next; 1094 struct gfs2_holder *gha, *gh; 1095 unsigned int slots = 64; 1096 unsigned int x; 1097 int done; 1098 int error = 0, err; 1099 1100 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 1101 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 1102 if (!gha) 1103 return -ENOMEM; 1104 for (x = 0; x < slots; x++) 1105 gfs2_holder_mark_uninitialized(gha + x); 1106 1107 rgd_next = gfs2_rgrpd_get_first(sdp); 1108 1109 for (;;) { 1110 done = 1; 1111 1112 for (x = 0; x < slots; x++) { 1113 gh = gha + x; 1114 1115 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) { 1116 err = gfs2_glock_wait(gh); 1117 if (err) { 1118 gfs2_holder_uninit(gh); 1119 error = err; 1120 } else { 1121 if (!error) { 1122 struct gfs2_rgrpd *rgd = 1123 gfs2_glock2rgrp(gh->gh_gl); 1124 1125 error = statfs_slow_fill(rgd, sc); 1126 } 1127 gfs2_glock_dq_uninit(gh); 1128 } 1129 } 1130 1131 if (gfs2_holder_initialized(gh)) 1132 done = 0; 1133 else if (rgd_next && !error) { 1134 error = gfs2_glock_nq_init(rgd_next->rd_gl, 1135 LM_ST_SHARED, 1136 GL_ASYNC, 1137 gh); 1138 rgd_next = gfs2_rgrpd_get_next(rgd_next); 1139 done = 0; 1140 } 1141 1142 if (signal_pending(current)) 1143 error = -ERESTARTSYS; 1144 } 1145 1146 if (done) 1147 break; 1148 1149 yield(); 1150 } 1151 1152 kfree(gha); 1153 return error; 1154 } 1155 1156 /** 1157 * gfs2_statfs_i - Do a statfs 1158 * @sdp: the filesystem 1159 * @sg: the sg structure 1160 * 1161 * Returns: errno 1162 */ 1163 1164 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1165 { 1166 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 1167 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 1168 1169 spin_lock(&sdp->sd_statfs_spin); 1170 1171 *sc = *m_sc; 1172 sc->sc_total += l_sc->sc_total; 1173 sc->sc_free += l_sc->sc_free; 1174 sc->sc_dinodes += l_sc->sc_dinodes; 1175 1176 spin_unlock(&sdp->sd_statfs_spin); 1177 1178 if (sc->sc_free < 0) 1179 sc->sc_free = 0; 1180 if (sc->sc_free > sc->sc_total) 1181 sc->sc_free = sc->sc_total; 1182 if (sc->sc_dinodes < 0) 1183 sc->sc_dinodes = 0; 1184 1185 return 0; 1186 } 1187 1188 /** 1189 * gfs2_statfs - Gather and return stats about the filesystem 1190 * @sb: The superblock 1191 * @statfsbuf: The buffer 1192 * 1193 * Returns: 0 on success or error code 1194 */ 1195 1196 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 1197 { 1198 struct super_block *sb = dentry->d_sb; 1199 struct gfs2_sbd *sdp = sb->s_fs_info; 1200 struct gfs2_statfs_change_host sc; 1201 int error; 1202 1203 error = gfs2_rindex_update(sdp); 1204 if (error) 1205 return error; 1206 1207 if (gfs2_tune_get(sdp, gt_statfs_slow)) 1208 error = gfs2_statfs_slow(sdp, &sc); 1209 else 1210 error = gfs2_statfs_i(sdp, &sc); 1211 1212 if (error) 1213 return error; 1214 1215 buf->f_type = GFS2_MAGIC; 1216 buf->f_bsize = sdp->sd_sb.sb_bsize; 1217 buf->f_blocks = sc.sc_total; 1218 buf->f_bfree = sc.sc_free; 1219 buf->f_bavail = sc.sc_free; 1220 buf->f_files = sc.sc_dinodes + sc.sc_free; 1221 buf->f_ffree = sc.sc_free; 1222 buf->f_namelen = GFS2_FNAMESIZE; 1223 1224 return 0; 1225 } 1226 1227 /** 1228 * gfs2_remount_fs - called when the FS is remounted 1229 * @sb: the filesystem 1230 * @flags: the remount flags 1231 * @data: extra data passed in (not used right now) 1232 * 1233 * Returns: errno 1234 */ 1235 1236 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) 1237 { 1238 struct gfs2_sbd *sdp = sb->s_fs_info; 1239 struct gfs2_args args = sdp->sd_args; /* Default to current settings */ 1240 struct gfs2_tune *gt = &sdp->sd_tune; 1241 int error; 1242 1243 sync_filesystem(sb); 1244 1245 spin_lock(>->gt_spin); 1246 args.ar_commit = gt->gt_logd_secs; 1247 args.ar_quota_quantum = gt->gt_quota_quantum; 1248 if (gt->gt_statfs_slow) 1249 args.ar_statfs_quantum = 0; 1250 else 1251 args.ar_statfs_quantum = gt->gt_statfs_quantum; 1252 spin_unlock(>->gt_spin); 1253 error = gfs2_mount_args(&args, data); 1254 if (error) 1255 return error; 1256 1257 /* Not allowed to change locking details */ 1258 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) || 1259 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) || 1260 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata)) 1261 return -EINVAL; 1262 1263 /* Some flags must not be changed */ 1264 if (args_neq(&args, &sdp->sd_args, spectator) || 1265 args_neq(&args, &sdp->sd_args, localflocks) || 1266 args_neq(&args, &sdp->sd_args, meta)) 1267 return -EINVAL; 1268 1269 if (sdp->sd_args.ar_spectator) 1270 *flags |= SB_RDONLY; 1271 1272 if ((sb->s_flags ^ *flags) & SB_RDONLY) { 1273 if (*flags & SB_RDONLY) 1274 error = gfs2_make_fs_ro(sdp); 1275 else 1276 error = gfs2_make_fs_rw(sdp); 1277 if (error) 1278 return error; 1279 } 1280 1281 sdp->sd_args = args; 1282 if (sdp->sd_args.ar_posix_acl) 1283 sb->s_flags |= SB_POSIXACL; 1284 else 1285 sb->s_flags &= ~SB_POSIXACL; 1286 if (sdp->sd_args.ar_nobarrier) 1287 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1288 else 1289 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1290 spin_lock(>->gt_spin); 1291 gt->gt_logd_secs = args.ar_commit; 1292 gt->gt_quota_quantum = args.ar_quota_quantum; 1293 if (args.ar_statfs_quantum) { 1294 gt->gt_statfs_slow = 0; 1295 gt->gt_statfs_quantum = args.ar_statfs_quantum; 1296 } 1297 else { 1298 gt->gt_statfs_slow = 1; 1299 gt->gt_statfs_quantum = 30; 1300 } 1301 spin_unlock(>->gt_spin); 1302 1303 gfs2_online_uevent(sdp); 1304 return 0; 1305 } 1306 1307 /** 1308 * gfs2_drop_inode - Drop an inode (test for remote unlink) 1309 * @inode: The inode to drop 1310 * 1311 * If we've received a callback on an iopen lock then it's because a 1312 * remote node tried to deallocate the inode but failed due to this node 1313 * still having the inode open. Here we mark the link count zero 1314 * since we know that it must have reached zero if the GLF_DEMOTE flag 1315 * is set on the iopen glock. If we didn't do a disk read since the 1316 * remote node removed the final link then we might otherwise miss 1317 * this event. This check ensures that this node will deallocate the 1318 * inode's blocks, or alternatively pass the baton on to another 1319 * node for later deallocation. 1320 */ 1321 1322 static int gfs2_drop_inode(struct inode *inode) 1323 { 1324 struct gfs2_inode *ip = GFS2_I(inode); 1325 1326 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && 1327 inode->i_nlink && 1328 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1329 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1330 if (test_bit(GLF_DEMOTE, &gl->gl_flags)) 1331 clear_nlink(inode); 1332 } 1333 1334 /* 1335 * When under memory pressure when an inode's link count has dropped to 1336 * zero, defer deleting the inode to the delete workqueue. This avoids 1337 * calling into DLM under memory pressure, which can deadlock. 1338 */ 1339 if (!inode->i_nlink && 1340 unlikely(current->flags & PF_MEMALLOC) && 1341 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1342 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1343 1344 gfs2_glock_hold(gl); 1345 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0) 1346 gfs2_glock_queue_put(gl); 1347 return false; 1348 } 1349 1350 return generic_drop_inode(inode); 1351 } 1352 1353 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 1354 { 1355 do { 1356 if (d1 == d2) 1357 return 1; 1358 d1 = d1->d_parent; 1359 } while (!IS_ROOT(d1)); 1360 return 0; 1361 } 1362 1363 /** 1364 * gfs2_show_options - Show mount options for /proc/mounts 1365 * @s: seq_file structure 1366 * @root: root of this (sub)tree 1367 * 1368 * Returns: 0 on success or error code 1369 */ 1370 1371 static int gfs2_show_options(struct seq_file *s, struct dentry *root) 1372 { 1373 struct gfs2_sbd *sdp = root->d_sb->s_fs_info; 1374 struct gfs2_args *args = &sdp->sd_args; 1375 int val; 1376 1377 if (is_ancestor(root, sdp->sd_master_dir)) 1378 seq_puts(s, ",meta"); 1379 if (args->ar_lockproto[0]) 1380 seq_show_option(s, "lockproto", args->ar_lockproto); 1381 if (args->ar_locktable[0]) 1382 seq_show_option(s, "locktable", args->ar_locktable); 1383 if (args->ar_hostdata[0]) 1384 seq_show_option(s, "hostdata", args->ar_hostdata); 1385 if (args->ar_spectator) 1386 seq_puts(s, ",spectator"); 1387 if (args->ar_localflocks) 1388 seq_puts(s, ",localflocks"); 1389 if (args->ar_debug) 1390 seq_puts(s, ",debug"); 1391 if (args->ar_posix_acl) 1392 seq_puts(s, ",acl"); 1393 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 1394 char *state; 1395 switch (args->ar_quota) { 1396 case GFS2_QUOTA_OFF: 1397 state = "off"; 1398 break; 1399 case GFS2_QUOTA_ACCOUNT: 1400 state = "account"; 1401 break; 1402 case GFS2_QUOTA_ON: 1403 state = "on"; 1404 break; 1405 default: 1406 state = "unknown"; 1407 break; 1408 } 1409 seq_printf(s, ",quota=%s", state); 1410 } 1411 if (args->ar_suiddir) 1412 seq_puts(s, ",suiddir"); 1413 if (args->ar_data != GFS2_DATA_DEFAULT) { 1414 char *state; 1415 switch (args->ar_data) { 1416 case GFS2_DATA_WRITEBACK: 1417 state = "writeback"; 1418 break; 1419 case GFS2_DATA_ORDERED: 1420 state = "ordered"; 1421 break; 1422 default: 1423 state = "unknown"; 1424 break; 1425 } 1426 seq_printf(s, ",data=%s", state); 1427 } 1428 if (args->ar_discard) 1429 seq_puts(s, ",discard"); 1430 val = sdp->sd_tune.gt_logd_secs; 1431 if (val != 30) 1432 seq_printf(s, ",commit=%d", val); 1433 val = sdp->sd_tune.gt_statfs_quantum; 1434 if (val != 30) 1435 seq_printf(s, ",statfs_quantum=%d", val); 1436 else if (sdp->sd_tune.gt_statfs_slow) 1437 seq_puts(s, ",statfs_quantum=0"); 1438 val = sdp->sd_tune.gt_quota_quantum; 1439 if (val != 60) 1440 seq_printf(s, ",quota_quantum=%d", val); 1441 if (args->ar_statfs_percent) 1442 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1443 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1444 const char *state; 1445 1446 switch (args->ar_errors) { 1447 case GFS2_ERRORS_WITHDRAW: 1448 state = "withdraw"; 1449 break; 1450 case GFS2_ERRORS_PANIC: 1451 state = "panic"; 1452 break; 1453 default: 1454 state = "unknown"; 1455 break; 1456 } 1457 seq_printf(s, ",errors=%s", state); 1458 } 1459 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1460 seq_puts(s, ",nobarrier"); 1461 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1462 seq_puts(s, ",demote_interface_used"); 1463 if (args->ar_rgrplvb) 1464 seq_puts(s, ",rgrplvb"); 1465 if (args->ar_loccookie) 1466 seq_puts(s, ",loccookie"); 1467 return 0; 1468 } 1469 1470 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1471 { 1472 struct inode *inode = &ip->i_inode; 1473 struct gfs2_glock *gl = ip->i_gl; 1474 1475 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1476 truncate_inode_pages(&inode->i_data, 0); 1477 1478 if (atomic_read(&gl->gl_revokes) == 0) { 1479 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1480 clear_bit(GLF_DIRTY, &gl->gl_flags); 1481 } 1482 } 1483 1484 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1485 { 1486 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1487 struct gfs2_rgrpd *rgd; 1488 struct gfs2_holder gh; 1489 int error; 1490 1491 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1492 gfs2_consist_inode(ip); 1493 return -EIO; 1494 } 1495 1496 error = gfs2_rindex_update(sdp); 1497 if (error) 1498 return error; 1499 1500 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 1501 if (error) 1502 return error; 1503 1504 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1505 if (!rgd) { 1506 gfs2_consist_inode(ip); 1507 error = -EIO; 1508 goto out_qs; 1509 } 1510 1511 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh); 1512 if (error) 1513 goto out_qs; 1514 1515 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1516 sdp->sd_jdesc->jd_blocks); 1517 if (error) 1518 goto out_rg_gunlock; 1519 1520 gfs2_free_di(rgd, ip); 1521 1522 gfs2_final_release_pages(ip); 1523 1524 gfs2_trans_end(sdp); 1525 1526 out_rg_gunlock: 1527 gfs2_glock_dq_uninit(&gh); 1528 out_qs: 1529 gfs2_quota_unhold(ip); 1530 return error; 1531 } 1532 1533 /** 1534 * gfs2_glock_put_eventually 1535 * @gl: The glock to put 1536 * 1537 * When under memory pressure, trigger a deferred glock put to make sure we 1538 * won't call into DLM and deadlock. Otherwise, put the glock directly. 1539 */ 1540 1541 static void gfs2_glock_put_eventually(struct gfs2_glock *gl) 1542 { 1543 if (current->flags & PF_MEMALLOC) 1544 gfs2_glock_queue_put(gl); 1545 else 1546 gfs2_glock_put(gl); 1547 } 1548 1549 /** 1550 * gfs2_evict_inode - Remove an inode from cache 1551 * @inode: The inode to evict 1552 * 1553 * There are three cases to consider: 1554 * 1. i_nlink == 0, we are final opener (and must deallocate) 1555 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1556 * 3. i_nlink > 0 1557 * 1558 * If the fs is read only, then we have to treat all cases as per #3 1559 * since we are unable to do any deallocation. The inode will be 1560 * deallocated by the next read/write node to attempt an allocation 1561 * in the same resource group 1562 * 1563 * We have to (at the moment) hold the inodes main lock to cover 1564 * the gap between unlocking the shared lock on the iopen lock and 1565 * taking the exclusive lock. I'd rather do a shared -> exclusive 1566 * conversion on the iopen lock, but we can change that later. This 1567 * is safe, just less efficient. 1568 */ 1569 1570 static void gfs2_evict_inode(struct inode *inode) 1571 { 1572 struct super_block *sb = inode->i_sb; 1573 struct gfs2_sbd *sdp = sb->s_fs_info; 1574 struct gfs2_inode *ip = GFS2_I(inode); 1575 struct gfs2_holder gh; 1576 struct address_space *metamapping; 1577 int error; 1578 1579 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) { 1580 clear_inode(inode); 1581 return; 1582 } 1583 1584 if (inode->i_nlink || sb_rdonly(sb)) 1585 goto out; 1586 1587 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { 1588 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl)); 1589 gfs2_holder_mark_uninitialized(&gh); 1590 goto alloc_failed; 1591 } 1592 1593 /* Deletes should never happen under memory pressure anymore. */ 1594 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC)) 1595 goto out; 1596 1597 /* Must not read inode block until block type has been verified */ 1598 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 1599 if (unlikely(error)) { 1600 glock_clear_object(ip->i_iopen_gh.gh_gl, ip); 1601 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1602 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1603 goto out; 1604 } 1605 1606 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1607 if (error) 1608 goto out_truncate; 1609 1610 if (test_bit(GIF_INVALID, &ip->i_flags)) { 1611 error = gfs2_inode_refresh(ip); 1612 if (error) 1613 goto out_truncate; 1614 } 1615 1616 /* 1617 * The inode may have been recreated in the meantime. 1618 */ 1619 if (inode->i_nlink) 1620 goto out_truncate; 1621 1622 alloc_failed: 1623 if (gfs2_holder_initialized(&ip->i_iopen_gh) && 1624 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1625 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1626 gfs2_glock_dq_wait(&ip->i_iopen_gh); 1627 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, 1628 &ip->i_iopen_gh); 1629 error = gfs2_glock_nq(&ip->i_iopen_gh); 1630 if (error) 1631 goto out_truncate; 1632 } 1633 1634 /* Case 1 starts here */ 1635 1636 if (S_ISDIR(inode->i_mode) && 1637 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1638 error = gfs2_dir_exhash_dealloc(ip); 1639 if (error) 1640 goto out_unlock; 1641 } 1642 1643 if (ip->i_eattr) { 1644 error = gfs2_ea_dealloc(ip); 1645 if (error) 1646 goto out_unlock; 1647 } 1648 1649 if (!gfs2_is_stuffed(ip)) { 1650 error = gfs2_file_dealloc(ip); 1651 if (error) 1652 goto out_unlock; 1653 } 1654 1655 /* We're about to clear the bitmap for the dinode, but as soon as we 1656 do, gfs2_create_inode can create another inode at the same block 1657 location and try to set gl_object again. We clear gl_object here so 1658 that subsequent inode creates don't see an old gl_object. */ 1659 glock_clear_object(ip->i_gl, ip); 1660 error = gfs2_dinode_dealloc(ip); 1661 goto out_unlock; 1662 1663 out_truncate: 1664 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 1665 GFS2_LFC_EVICT_INODE); 1666 metamapping = gfs2_glock2aspace(ip->i_gl); 1667 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1668 filemap_fdatawrite(metamapping); 1669 filemap_fdatawait(metamapping); 1670 } 1671 write_inode_now(inode, 1); 1672 gfs2_ail_flush(ip->i_gl, 0); 1673 1674 /* Case 2 starts here */ 1675 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1676 if (error) 1677 goto out_unlock; 1678 /* Needs to be done before glock release & also in a transaction */ 1679 truncate_inode_pages(&inode->i_data, 0); 1680 truncate_inode_pages(metamapping, 0); 1681 gfs2_trans_end(sdp); 1682 1683 out_unlock: 1684 /* Error path for case 1 */ 1685 if (gfs2_rs_active(&ip->i_res)) 1686 gfs2_rs_deltree(&ip->i_res); 1687 1688 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1689 glock_clear_object(ip->i_iopen_gh.gh_gl, ip); 1690 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1691 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1692 gfs2_glock_dq(&ip->i_iopen_gh); 1693 } 1694 gfs2_holder_uninit(&ip->i_iopen_gh); 1695 } 1696 if (gfs2_holder_initialized(&gh)) { 1697 glock_clear_object(ip->i_gl, ip); 1698 gfs2_glock_dq_uninit(&gh); 1699 } 1700 if (error && error != GLR_TRYFAILED && error != -EROFS) 1701 fs_warn(sdp, "gfs2_evict_inode: %d\n", error); 1702 out: 1703 /* Case 3 starts here */ 1704 truncate_inode_pages_final(&inode->i_data); 1705 gfs2_rsqa_delete(ip, NULL); 1706 gfs2_ordered_del_inode(ip); 1707 clear_inode(inode); 1708 gfs2_dir_hash_inval(ip); 1709 glock_clear_object(ip->i_gl, ip); 1710 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE); 1711 gfs2_glock_add_to_lru(ip->i_gl); 1712 gfs2_glock_put_eventually(ip->i_gl); 1713 ip->i_gl = NULL; 1714 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1715 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1716 1717 glock_clear_object(gl, ip); 1718 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1719 gfs2_glock_hold(gl); 1720 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1721 gfs2_glock_put_eventually(gl); 1722 } 1723 } 1724 1725 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1726 { 1727 struct gfs2_inode *ip; 1728 1729 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1730 if (ip) { 1731 ip->i_flags = 0; 1732 ip->i_gl = NULL; 1733 memset(&ip->i_res, 0, sizeof(ip->i_res)); 1734 RB_CLEAR_NODE(&ip->i_res.rs_node); 1735 ip->i_rahead = 0; 1736 } 1737 return &ip->i_inode; 1738 } 1739 1740 static void gfs2_i_callback(struct rcu_head *head) 1741 { 1742 struct inode *inode = container_of(head, struct inode, i_rcu); 1743 kmem_cache_free(gfs2_inode_cachep, inode); 1744 } 1745 1746 static void gfs2_destroy_inode(struct inode *inode) 1747 { 1748 call_rcu(&inode->i_rcu, gfs2_i_callback); 1749 } 1750 1751 const struct super_operations gfs2_super_ops = { 1752 .alloc_inode = gfs2_alloc_inode, 1753 .destroy_inode = gfs2_destroy_inode, 1754 .write_inode = gfs2_write_inode, 1755 .dirty_inode = gfs2_dirty_inode, 1756 .evict_inode = gfs2_evict_inode, 1757 .put_super = gfs2_put_super, 1758 .sync_fs = gfs2_sync_fs, 1759 .freeze_super = gfs2_freeze, 1760 .thaw_super = gfs2_unfreeze, 1761 .statfs = gfs2_statfs, 1762 .remount_fs = gfs2_remount_fs, 1763 .drop_inode = gfs2_drop_inode, 1764 .show_options = gfs2_show_options, 1765 }; 1766 1767