1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/bio.h> 10 #include <linux/sched/signal.h> 11 #include <linux/slab.h> 12 #include <linux/spinlock.h> 13 #include <linux/completion.h> 14 #include <linux/buffer_head.h> 15 #include <linux/statfs.h> 16 #include <linux/seq_file.h> 17 #include <linux/mount.h> 18 #include <linux/kthread.h> 19 #include <linux/delay.h> 20 #include <linux/gfs2_ondisk.h> 21 #include <linux/crc32.h> 22 #include <linux/time.h> 23 #include <linux/wait.h> 24 #include <linux/writeback.h> 25 #include <linux/backing-dev.h> 26 #include <linux/kernel.h> 27 28 #include "gfs2.h" 29 #include "incore.h" 30 #include "bmap.h" 31 #include "dir.h" 32 #include "glock.h" 33 #include "glops.h" 34 #include "inode.h" 35 #include "log.h" 36 #include "meta_io.h" 37 #include "quota.h" 38 #include "recovery.h" 39 #include "rgrp.h" 40 #include "super.h" 41 #include "trans.h" 42 #include "util.h" 43 #include "sys.h" 44 #include "xattr.h" 45 #include "lops.h" 46 47 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x) 48 49 enum { 50 Opt_lockproto, 51 Opt_locktable, 52 Opt_hostdata, 53 Opt_spectator, 54 Opt_ignore_local_fs, 55 Opt_localflocks, 56 Opt_localcaching, 57 Opt_debug, 58 Opt_nodebug, 59 Opt_upgrade, 60 Opt_acl, 61 Opt_noacl, 62 Opt_quota_off, 63 Opt_quota_account, 64 Opt_quota_on, 65 Opt_quota, 66 Opt_noquota, 67 Opt_suiddir, 68 Opt_nosuiddir, 69 Opt_data_writeback, 70 Opt_data_ordered, 71 Opt_meta, 72 Opt_discard, 73 Opt_nodiscard, 74 Opt_commit, 75 Opt_err_withdraw, 76 Opt_err_panic, 77 Opt_statfs_quantum, 78 Opt_statfs_percent, 79 Opt_quota_quantum, 80 Opt_barrier, 81 Opt_nobarrier, 82 Opt_rgrplvb, 83 Opt_norgrplvb, 84 Opt_loccookie, 85 Opt_noloccookie, 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_loccookie, "loccookie"}, 126 {Opt_noloccookie, "noloccookie"}, 127 {Opt_error, NULL} 128 }; 129 130 /** 131 * gfs2_mount_args - Parse mount options 132 * @args: The structure into which the parsed options will be written 133 * @options: The options to parse 134 * 135 * Return: errno 136 */ 137 138 int gfs2_mount_args(struct gfs2_args *args, char *options) 139 { 140 char *o; 141 int token; 142 substring_t tmp[MAX_OPT_ARGS]; 143 int rv; 144 145 /* Split the options into tokens with the "," character and 146 process them */ 147 148 while (1) { 149 o = strsep(&options, ","); 150 if (o == NULL) 151 break; 152 if (*o == '\0') 153 continue; 154 155 token = match_token(o, tokens, tmp); 156 switch (token) { 157 case Opt_lockproto: 158 match_strlcpy(args->ar_lockproto, &tmp[0], 159 GFS2_LOCKNAME_LEN); 160 break; 161 case Opt_locktable: 162 match_strlcpy(args->ar_locktable, &tmp[0], 163 GFS2_LOCKNAME_LEN); 164 break; 165 case Opt_hostdata: 166 match_strlcpy(args->ar_hostdata, &tmp[0], 167 GFS2_LOCKNAME_LEN); 168 break; 169 case Opt_spectator: 170 args->ar_spectator = 1; 171 break; 172 case Opt_ignore_local_fs: 173 /* Retained for backwards compat only */ 174 break; 175 case Opt_localflocks: 176 args->ar_localflocks = 1; 177 break; 178 case Opt_localcaching: 179 /* Retained for backwards compat only */ 180 break; 181 case Opt_debug: 182 if (args->ar_errors == GFS2_ERRORS_PANIC) { 183 pr_warn("-o debug and -o errors=panic are mutually exclusive\n"); 184 return -EINVAL; 185 } 186 args->ar_debug = 1; 187 break; 188 case Opt_nodebug: 189 args->ar_debug = 0; 190 break; 191 case Opt_upgrade: 192 /* Retained for backwards compat only */ 193 break; 194 case Opt_acl: 195 args->ar_posix_acl = 1; 196 break; 197 case Opt_noacl: 198 args->ar_posix_acl = 0; 199 break; 200 case Opt_quota_off: 201 case Opt_noquota: 202 args->ar_quota = GFS2_QUOTA_OFF; 203 break; 204 case Opt_quota_account: 205 args->ar_quota = GFS2_QUOTA_ACCOUNT; 206 break; 207 case Opt_quota_on: 208 case Opt_quota: 209 args->ar_quota = GFS2_QUOTA_ON; 210 break; 211 case Opt_suiddir: 212 args->ar_suiddir = 1; 213 break; 214 case Opt_nosuiddir: 215 args->ar_suiddir = 0; 216 break; 217 case Opt_data_writeback: 218 args->ar_data = GFS2_DATA_WRITEBACK; 219 break; 220 case Opt_data_ordered: 221 args->ar_data = GFS2_DATA_ORDERED; 222 break; 223 case Opt_meta: 224 args->ar_meta = 1; 225 break; 226 case Opt_discard: 227 args->ar_discard = 1; 228 break; 229 case Opt_nodiscard: 230 args->ar_discard = 0; 231 break; 232 case Opt_commit: 233 rv = match_int(&tmp[0], &args->ar_commit); 234 if (rv || args->ar_commit <= 0) { 235 pr_warn("commit mount option requires a positive numeric argument\n"); 236 return rv ? rv : -EINVAL; 237 } 238 break; 239 case Opt_statfs_quantum: 240 rv = match_int(&tmp[0], &args->ar_statfs_quantum); 241 if (rv || args->ar_statfs_quantum < 0) { 242 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n"); 243 return rv ? rv : -EINVAL; 244 } 245 break; 246 case Opt_quota_quantum: 247 rv = match_int(&tmp[0], &args->ar_quota_quantum); 248 if (rv || args->ar_quota_quantum <= 0) { 249 pr_warn("quota_quantum mount option requires a positive numeric argument\n"); 250 return rv ? rv : -EINVAL; 251 } 252 break; 253 case Opt_statfs_percent: 254 rv = match_int(&tmp[0], &args->ar_statfs_percent); 255 if (rv || args->ar_statfs_percent < 0 || 256 args->ar_statfs_percent > 100) { 257 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n"); 258 return rv ? rv : -EINVAL; 259 } 260 break; 261 case Opt_err_withdraw: 262 args->ar_errors = GFS2_ERRORS_WITHDRAW; 263 break; 264 case Opt_err_panic: 265 if (args->ar_debug) { 266 pr_warn("-o debug and -o errors=panic are mutually exclusive\n"); 267 return -EINVAL; 268 } 269 args->ar_errors = GFS2_ERRORS_PANIC; 270 break; 271 case Opt_barrier: 272 args->ar_nobarrier = 0; 273 break; 274 case Opt_nobarrier: 275 args->ar_nobarrier = 1; 276 break; 277 case Opt_rgrplvb: 278 args->ar_rgrplvb = 1; 279 break; 280 case Opt_norgrplvb: 281 args->ar_rgrplvb = 0; 282 break; 283 case Opt_loccookie: 284 args->ar_loccookie = 1; 285 break; 286 case Opt_noloccookie: 287 args->ar_loccookie = 0; 288 break; 289 case Opt_error: 290 default: 291 pr_warn("invalid mount option: %s\n", o); 292 return -EINVAL; 293 } 294 } 295 296 return 0; 297 } 298 299 /** 300 * gfs2_jindex_free - Clear all the journal index information 301 * @sdp: The GFS2 superblock 302 * 303 */ 304 305 void gfs2_jindex_free(struct gfs2_sbd *sdp) 306 { 307 struct list_head list; 308 struct gfs2_jdesc *jd; 309 310 spin_lock(&sdp->sd_jindex_spin); 311 list_add(&list, &sdp->sd_jindex_list); 312 list_del_init(&sdp->sd_jindex_list); 313 sdp->sd_journals = 0; 314 spin_unlock(&sdp->sd_jindex_spin); 315 316 while (!list_empty(&list)) { 317 jd = list_entry(list.next, struct gfs2_jdesc, jd_list); 318 gfs2_free_journal_extents(jd); 319 list_del(&jd->jd_list); 320 iput(jd->jd_inode); 321 kfree(jd); 322 } 323 } 324 325 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) 326 { 327 struct gfs2_jdesc *jd; 328 int found = 0; 329 330 list_for_each_entry(jd, head, jd_list) { 331 if (jd->jd_jid == jid) { 332 found = 1; 333 break; 334 } 335 } 336 337 if (!found) 338 jd = NULL; 339 340 return jd; 341 } 342 343 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) 344 { 345 struct gfs2_jdesc *jd; 346 347 spin_lock(&sdp->sd_jindex_spin); 348 jd = jdesc_find_i(&sdp->sd_jindex_list, jid); 349 spin_unlock(&sdp->sd_jindex_spin); 350 351 return jd; 352 } 353 354 int gfs2_jdesc_check(struct gfs2_jdesc *jd) 355 { 356 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 357 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 358 u64 size = i_size_read(jd->jd_inode); 359 360 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30))) 361 return -EIO; 362 363 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift; 364 365 if (gfs2_write_alloc_required(ip, 0, size)) { 366 gfs2_consist_inode(ip); 367 return -EIO; 368 } 369 370 return 0; 371 } 372 373 static int init_threads(struct gfs2_sbd *sdp) 374 { 375 struct task_struct *p; 376 int error = 0; 377 378 p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); 379 if (IS_ERR(p)) { 380 error = PTR_ERR(p); 381 fs_err(sdp, "can't start logd thread: %d\n", error); 382 return error; 383 } 384 sdp->sd_logd_process = p; 385 386 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); 387 if (IS_ERR(p)) { 388 error = PTR_ERR(p); 389 fs_err(sdp, "can't start quotad thread: %d\n", error); 390 goto fail; 391 } 392 sdp->sd_quotad_process = p; 393 return 0; 394 395 fail: 396 kthread_stop(sdp->sd_logd_process); 397 sdp->sd_logd_process = NULL; 398 return error; 399 } 400 401 /** 402 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one 403 * @sdp: the filesystem 404 * 405 * Returns: errno 406 */ 407 408 int gfs2_make_fs_rw(struct gfs2_sbd *sdp) 409 { 410 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 411 struct gfs2_glock *j_gl = ip->i_gl; 412 struct gfs2_holder freeze_gh; 413 struct gfs2_log_header_host head; 414 int error; 415 416 error = init_threads(sdp); 417 if (error) 418 return error; 419 420 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0, 421 &freeze_gh); 422 if (error) 423 goto fail_threads; 424 425 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 426 427 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false); 428 if (error) 429 goto fail; 430 431 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 432 gfs2_consist(sdp); 433 error = -EIO; 434 goto fail; 435 } 436 437 /* Initialize some head of the log stuff */ 438 sdp->sd_log_sequence = head.lh_sequence + 1; 439 gfs2_log_pointers_init(sdp, head.lh_blkno); 440 441 error = gfs2_quota_init(sdp); 442 if (error) 443 goto fail; 444 445 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 446 447 gfs2_glock_dq_uninit(&freeze_gh); 448 449 return 0; 450 451 fail: 452 freeze_gh.gh_flags |= GL_NOCACHE; 453 gfs2_glock_dq_uninit(&freeze_gh); 454 fail_threads: 455 if (sdp->sd_quotad_process) 456 kthread_stop(sdp->sd_quotad_process); 457 sdp->sd_quotad_process = NULL; 458 if (sdp->sd_logd_process) 459 kthread_stop(sdp->sd_logd_process); 460 sdp->sd_logd_process = NULL; 461 return error; 462 } 463 464 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) 465 { 466 const struct gfs2_statfs_change *str = buf; 467 468 sc->sc_total = be64_to_cpu(str->sc_total); 469 sc->sc_free = be64_to_cpu(str->sc_free); 470 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); 471 } 472 473 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) 474 { 475 struct gfs2_statfs_change *str = buf; 476 477 str->sc_total = cpu_to_be64(sc->sc_total); 478 str->sc_free = cpu_to_be64(sc->sc_free); 479 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); 480 } 481 482 int gfs2_statfs_init(struct gfs2_sbd *sdp) 483 { 484 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 485 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 486 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 487 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 488 struct buffer_head *m_bh, *l_bh; 489 struct gfs2_holder gh; 490 int error; 491 492 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 493 &gh); 494 if (error) 495 return error; 496 497 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 498 if (error) 499 goto out; 500 501 if (sdp->sd_args.ar_spectator) { 502 spin_lock(&sdp->sd_statfs_spin); 503 gfs2_statfs_change_in(m_sc, m_bh->b_data + 504 sizeof(struct gfs2_dinode)); 505 spin_unlock(&sdp->sd_statfs_spin); 506 } else { 507 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 508 if (error) 509 goto out_m_bh; 510 511 spin_lock(&sdp->sd_statfs_spin); 512 gfs2_statfs_change_in(m_sc, m_bh->b_data + 513 sizeof(struct gfs2_dinode)); 514 gfs2_statfs_change_in(l_sc, l_bh->b_data + 515 sizeof(struct gfs2_dinode)); 516 spin_unlock(&sdp->sd_statfs_spin); 517 518 brelse(l_bh); 519 } 520 521 out_m_bh: 522 brelse(m_bh); 523 out: 524 gfs2_glock_dq_uninit(&gh); 525 return 0; 526 } 527 528 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, 529 s64 dinodes) 530 { 531 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 532 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 533 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 534 struct buffer_head *l_bh; 535 s64 x, y; 536 int need_sync = 0; 537 int error; 538 539 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 540 if (error) 541 return; 542 543 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 544 545 spin_lock(&sdp->sd_statfs_spin); 546 l_sc->sc_total += total; 547 l_sc->sc_free += free; 548 l_sc->sc_dinodes += dinodes; 549 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); 550 if (sdp->sd_args.ar_statfs_percent) { 551 x = 100 * l_sc->sc_free; 552 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent; 553 if (x >= y || x <= -y) 554 need_sync = 1; 555 } 556 spin_unlock(&sdp->sd_statfs_spin); 557 558 brelse(l_bh); 559 if (need_sync) 560 gfs2_wake_up_statfs(sdp); 561 } 562 563 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh, 564 struct buffer_head *l_bh) 565 { 566 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 567 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 568 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 569 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 570 571 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 572 gfs2_trans_add_meta(m_ip->i_gl, m_bh); 573 574 spin_lock(&sdp->sd_statfs_spin); 575 m_sc->sc_total += l_sc->sc_total; 576 m_sc->sc_free += l_sc->sc_free; 577 m_sc->sc_dinodes += l_sc->sc_dinodes; 578 memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); 579 memset(l_bh->b_data + sizeof(struct gfs2_dinode), 580 0, sizeof(struct gfs2_statfs_change)); 581 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); 582 spin_unlock(&sdp->sd_statfs_spin); 583 } 584 585 int gfs2_statfs_sync(struct super_block *sb, int type) 586 { 587 struct gfs2_sbd *sdp = sb->s_fs_info; 588 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 589 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 590 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 591 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 592 struct gfs2_holder gh; 593 struct buffer_head *m_bh, *l_bh; 594 int error; 595 596 sb_start_write(sb); 597 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 598 &gh); 599 if (error) 600 goto out; 601 602 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 603 if (error) 604 goto out_unlock; 605 606 spin_lock(&sdp->sd_statfs_spin); 607 gfs2_statfs_change_in(m_sc, m_bh->b_data + 608 sizeof(struct gfs2_dinode)); 609 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { 610 spin_unlock(&sdp->sd_statfs_spin); 611 goto out_bh; 612 } 613 spin_unlock(&sdp->sd_statfs_spin); 614 615 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 616 if (error) 617 goto out_bh; 618 619 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 620 if (error) 621 goto out_bh2; 622 623 update_statfs(sdp, m_bh, l_bh); 624 sdp->sd_statfs_force_sync = 0; 625 626 gfs2_trans_end(sdp); 627 628 out_bh2: 629 brelse(l_bh); 630 out_bh: 631 brelse(m_bh); 632 out_unlock: 633 gfs2_glock_dq_uninit(&gh); 634 out: 635 sb_end_write(sb); 636 return error; 637 } 638 639 struct lfcc { 640 struct list_head list; 641 struct gfs2_holder gh; 642 }; 643 644 /** 645 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all 646 * journals are clean 647 * @sdp: the file system 648 * @state: the state to put the transaction lock into 649 * @t_gh: the hold on the transaction lock 650 * 651 * Returns: errno 652 */ 653 654 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, 655 struct gfs2_holder *freeze_gh) 656 { 657 struct gfs2_inode *ip; 658 struct gfs2_jdesc *jd; 659 struct lfcc *lfcc; 660 LIST_HEAD(list); 661 struct gfs2_log_header_host lh; 662 int error; 663 664 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 665 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); 666 if (!lfcc) { 667 error = -ENOMEM; 668 goto out; 669 } 670 ip = GFS2_I(jd->jd_inode); 671 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); 672 if (error) { 673 kfree(lfcc); 674 goto out; 675 } 676 list_add(&lfcc->list, &list); 677 } 678 679 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE, 680 GL_NOCACHE, freeze_gh); 681 682 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 683 error = gfs2_jdesc_check(jd); 684 if (error) 685 break; 686 error = gfs2_find_jhead(jd, &lh, false); 687 if (error) 688 break; 689 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 690 error = -EBUSY; 691 break; 692 } 693 } 694 695 if (error) 696 gfs2_glock_dq_uninit(freeze_gh); 697 698 out: 699 while (!list_empty(&list)) { 700 lfcc = list_entry(list.next, struct lfcc, list); 701 list_del(&lfcc->list); 702 gfs2_glock_dq_uninit(&lfcc->gh); 703 kfree(lfcc); 704 } 705 return error; 706 } 707 708 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 709 { 710 struct gfs2_dinode *str = buf; 711 712 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 713 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); 714 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); 715 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); 716 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); 717 str->di_mode = cpu_to_be32(ip->i_inode.i_mode); 718 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode)); 719 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode)); 720 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); 721 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode)); 722 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); 723 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 724 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); 725 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); 726 727 str->di_goal_meta = cpu_to_be64(ip->i_goal); 728 str->di_goal_data = cpu_to_be64(ip->i_goal); 729 str->di_generation = cpu_to_be64(ip->i_generation); 730 731 str->di_flags = cpu_to_be32(ip->i_diskflags); 732 str->di_height = cpu_to_be16(ip->i_height); 733 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && 734 !(ip->i_diskflags & GFS2_DIF_EXHASH) ? 735 GFS2_FORMAT_DE : 0); 736 str->di_depth = cpu_to_be16(ip->i_depth); 737 str->di_entries = cpu_to_be32(ip->i_entries); 738 739 str->di_eattr = cpu_to_be64(ip->i_eattr); 740 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); 741 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); 742 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); 743 } 744 745 /** 746 * gfs2_write_inode - Make sure the inode is stable on the disk 747 * @inode: The inode 748 * @wbc: The writeback control structure 749 * 750 * Returns: errno 751 */ 752 753 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) 754 { 755 struct gfs2_inode *ip = GFS2_I(inode); 756 struct gfs2_sbd *sdp = GFS2_SB(inode); 757 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 758 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host); 759 int ret = 0; 760 bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip)); 761 762 if (flush_all) 763 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, 764 GFS2_LOG_HEAD_FLUSH_NORMAL | 765 GFS2_LFC_WRITE_INODE); 766 if (bdi->wb.dirty_exceeded) 767 gfs2_ail1_flush(sdp, wbc); 768 else 769 filemap_fdatawrite(metamapping); 770 if (flush_all) 771 ret = filemap_fdatawait(metamapping); 772 if (ret) 773 mark_inode_dirty_sync(inode); 774 else { 775 spin_lock(&inode->i_lock); 776 if (!(inode->i_flags & I_DIRTY)) 777 gfs2_ordered_del_inode(ip); 778 spin_unlock(&inode->i_lock); 779 } 780 return ret; 781 } 782 783 /** 784 * gfs2_dirty_inode - check for atime updates 785 * @inode: The inode in question 786 * @flags: The type of dirty 787 * 788 * Unfortunately it can be called under any combination of inode 789 * glock and transaction lock, so we have to check carefully. 790 * 791 * At the moment this deals only with atime - it should be possible 792 * to expand that role in future, once a review of the locking has 793 * been carried out. 794 */ 795 796 static void gfs2_dirty_inode(struct inode *inode, int flags) 797 { 798 struct gfs2_inode *ip = GFS2_I(inode); 799 struct gfs2_sbd *sdp = GFS2_SB(inode); 800 struct buffer_head *bh; 801 struct gfs2_holder gh; 802 int need_unlock = 0; 803 int need_endtrans = 0; 804 int ret; 805 806 if (!(flags & I_DIRTY_INODE)) 807 return; 808 if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags))) 809 return; 810 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { 811 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 812 if (ret) { 813 fs_err(sdp, "dirty_inode: glock %d\n", ret); 814 return; 815 } 816 need_unlock = 1; 817 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) 818 return; 819 820 if (current->journal_info == NULL) { 821 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 822 if (ret) { 823 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); 824 goto out; 825 } 826 need_endtrans = 1; 827 } 828 829 ret = gfs2_meta_inode_buffer(ip, &bh); 830 if (ret == 0) { 831 gfs2_trans_add_meta(ip->i_gl, bh); 832 gfs2_dinode_out(ip, bh->b_data); 833 brelse(bh); 834 } 835 836 if (need_endtrans) 837 gfs2_trans_end(sdp); 838 out: 839 if (need_unlock) 840 gfs2_glock_dq_uninit(&gh); 841 } 842 843 /** 844 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 845 * @sdp: the filesystem 846 * 847 * Returns: errno 848 */ 849 850 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp) 851 { 852 struct gfs2_holder freeze_gh; 853 int error; 854 855 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE, 856 &freeze_gh); 857 if (error && !test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) 858 return error; 859 860 flush_workqueue(gfs2_delete_workqueue); 861 if (sdp->sd_quotad_process) 862 kthread_stop(sdp->sd_quotad_process); 863 sdp->sd_quotad_process = NULL; 864 if (sdp->sd_logd_process) 865 kthread_stop(sdp->sd_logd_process); 866 sdp->sd_logd_process = NULL; 867 868 gfs2_quota_sync(sdp->sd_vfs, 0); 869 gfs2_statfs_sync(sdp->sd_vfs, 0); 870 871 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN | 872 GFS2_LFC_MAKE_FS_RO); 873 wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0); 874 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks); 875 876 if (gfs2_holder_initialized(&freeze_gh)) 877 gfs2_glock_dq_uninit(&freeze_gh); 878 879 gfs2_quota_cleanup(sdp); 880 881 return error; 882 } 883 884 /** 885 * gfs2_put_super - Unmount the filesystem 886 * @sb: The VFS superblock 887 * 888 */ 889 890 static void gfs2_put_super(struct super_block *sb) 891 { 892 struct gfs2_sbd *sdp = sb->s_fs_info; 893 int error; 894 struct gfs2_jdesc *jd; 895 896 /* No more recovery requests */ 897 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 898 smp_mb(); 899 900 /* Wait on outstanding recovery */ 901 restart: 902 spin_lock(&sdp->sd_jindex_spin); 903 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 904 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 905 continue; 906 spin_unlock(&sdp->sd_jindex_spin); 907 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 908 TASK_UNINTERRUPTIBLE); 909 goto restart; 910 } 911 spin_unlock(&sdp->sd_jindex_spin); 912 913 if (!sb_rdonly(sb)) { 914 error = gfs2_make_fs_ro(sdp); 915 if (error) 916 gfs2_io_error(sdp); 917 } 918 /* At this point, we're through modifying the disk */ 919 920 /* Release stuff */ 921 922 iput(sdp->sd_jindex); 923 iput(sdp->sd_statfs_inode); 924 iput(sdp->sd_rindex); 925 iput(sdp->sd_quota_inode); 926 927 gfs2_glock_put(sdp->sd_rename_gl); 928 gfs2_glock_put(sdp->sd_freeze_gl); 929 930 if (!sdp->sd_args.ar_spectator) { 931 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 932 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 933 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 934 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 935 iput(sdp->sd_sc_inode); 936 iput(sdp->sd_qc_inode); 937 } 938 939 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 940 gfs2_clear_rgrpd(sdp); 941 gfs2_jindex_free(sdp); 942 /* Take apart glock structures and buffer lists */ 943 gfs2_gl_hash_clear(sdp); 944 gfs2_delete_debugfs_file(sdp); 945 /* Unmount the locking protocol */ 946 gfs2_lm_unmount(sdp); 947 948 /* At this point, we're through participating in the lockspace */ 949 gfs2_sys_fs_del(sdp); 950 } 951 952 /** 953 * gfs2_sync_fs - sync the filesystem 954 * @sb: the superblock 955 * 956 * Flushes the log to disk. 957 */ 958 959 static int gfs2_sync_fs(struct super_block *sb, int wait) 960 { 961 struct gfs2_sbd *sdp = sb->s_fs_info; 962 963 gfs2_quota_sync(sb, -1); 964 if (wait) 965 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 966 GFS2_LFC_SYNC_FS); 967 return sdp->sd_log_error; 968 } 969 970 void gfs2_freeze_func(struct work_struct *work) 971 { 972 int error; 973 struct gfs2_holder freeze_gh; 974 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work); 975 struct super_block *sb = sdp->sd_vfs; 976 977 atomic_inc(&sb->s_active); 978 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0, 979 &freeze_gh); 980 if (error) { 981 fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error); 982 gfs2_assert_withdraw(sdp, 0); 983 } else { 984 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 985 error = thaw_super(sb); 986 if (error) { 987 fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n", 988 error); 989 gfs2_assert_withdraw(sdp, 0); 990 } 991 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 992 freeze_gh.gh_flags |= GL_NOCACHE; 993 gfs2_glock_dq_uninit(&freeze_gh); 994 } 995 deactivate_super(sb); 996 clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags); 997 wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN); 998 return; 999 } 1000 1001 /** 1002 * gfs2_freeze - prevent further writes to the filesystem 1003 * @sb: the VFS structure for the filesystem 1004 * 1005 */ 1006 1007 static int gfs2_freeze(struct super_block *sb) 1008 { 1009 struct gfs2_sbd *sdp = sb->s_fs_info; 1010 int error = 0; 1011 1012 mutex_lock(&sdp->sd_freeze_mutex); 1013 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) 1014 goto out; 1015 1016 if (test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) { 1017 error = -EINVAL; 1018 goto out; 1019 } 1020 1021 for (;;) { 1022 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); 1023 if (!error) 1024 break; 1025 1026 if (error == -EBUSY) 1027 fs_err(sdp, "waiting for recovery before freeze\n"); 1028 else 1029 fs_err(sdp, "error freezing FS: %d\n", error); 1030 1031 fs_err(sdp, "retrying...\n"); 1032 msleep(1000); 1033 } 1034 set_bit(SDF_FS_FROZEN, &sdp->sd_flags); 1035 out: 1036 mutex_unlock(&sdp->sd_freeze_mutex); 1037 return error; 1038 } 1039 1040 /** 1041 * gfs2_unfreeze - reallow writes to the filesystem 1042 * @sb: the VFS structure for the filesystem 1043 * 1044 */ 1045 1046 static int gfs2_unfreeze(struct super_block *sb) 1047 { 1048 struct gfs2_sbd *sdp = sb->s_fs_info; 1049 1050 mutex_lock(&sdp->sd_freeze_mutex); 1051 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN || 1052 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) { 1053 mutex_unlock(&sdp->sd_freeze_mutex); 1054 return 0; 1055 } 1056 1057 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 1058 mutex_unlock(&sdp->sd_freeze_mutex); 1059 return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE); 1060 } 1061 1062 /** 1063 * statfs_fill - fill in the sg for a given RG 1064 * @rgd: the RG 1065 * @sc: the sc structure 1066 * 1067 * Returns: 0 on success, -ESTALE if the LVB is invalid 1068 */ 1069 1070 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 1071 struct gfs2_statfs_change_host *sc) 1072 { 1073 gfs2_rgrp_verify(rgd); 1074 sc->sc_total += rgd->rd_data; 1075 sc->sc_free += rgd->rd_free; 1076 sc->sc_dinodes += rgd->rd_dinodes; 1077 return 0; 1078 } 1079 1080 /** 1081 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 1082 * @sdp: the filesystem 1083 * @sc: the sc info that will be returned 1084 * 1085 * Any error (other than a signal) will cause this routine to fall back 1086 * to the synchronous version. 1087 * 1088 * FIXME: This really shouldn't busy wait like this. 1089 * 1090 * Returns: errno 1091 */ 1092 1093 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1094 { 1095 struct gfs2_rgrpd *rgd_next; 1096 struct gfs2_holder *gha, *gh; 1097 unsigned int slots = 64; 1098 unsigned int x; 1099 int done; 1100 int error = 0, err; 1101 1102 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 1103 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 1104 if (!gha) 1105 return -ENOMEM; 1106 for (x = 0; x < slots; x++) 1107 gfs2_holder_mark_uninitialized(gha + x); 1108 1109 rgd_next = gfs2_rgrpd_get_first(sdp); 1110 1111 for (;;) { 1112 done = 1; 1113 1114 for (x = 0; x < slots; x++) { 1115 gh = gha + x; 1116 1117 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) { 1118 err = gfs2_glock_wait(gh); 1119 if (err) { 1120 gfs2_holder_uninit(gh); 1121 error = err; 1122 } else { 1123 if (!error) { 1124 struct gfs2_rgrpd *rgd = 1125 gfs2_glock2rgrp(gh->gh_gl); 1126 1127 error = statfs_slow_fill(rgd, sc); 1128 } 1129 gfs2_glock_dq_uninit(gh); 1130 } 1131 } 1132 1133 if (gfs2_holder_initialized(gh)) 1134 done = 0; 1135 else if (rgd_next && !error) { 1136 error = gfs2_glock_nq_init(rgd_next->rd_gl, 1137 LM_ST_SHARED, 1138 GL_ASYNC, 1139 gh); 1140 rgd_next = gfs2_rgrpd_get_next(rgd_next); 1141 done = 0; 1142 } 1143 1144 if (signal_pending(current)) 1145 error = -ERESTARTSYS; 1146 } 1147 1148 if (done) 1149 break; 1150 1151 yield(); 1152 } 1153 1154 kfree(gha); 1155 return error; 1156 } 1157 1158 /** 1159 * gfs2_statfs_i - Do a statfs 1160 * @sdp: the filesystem 1161 * @sg: the sg structure 1162 * 1163 * Returns: errno 1164 */ 1165 1166 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1167 { 1168 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 1169 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 1170 1171 spin_lock(&sdp->sd_statfs_spin); 1172 1173 *sc = *m_sc; 1174 sc->sc_total += l_sc->sc_total; 1175 sc->sc_free += l_sc->sc_free; 1176 sc->sc_dinodes += l_sc->sc_dinodes; 1177 1178 spin_unlock(&sdp->sd_statfs_spin); 1179 1180 if (sc->sc_free < 0) 1181 sc->sc_free = 0; 1182 if (sc->sc_free > sc->sc_total) 1183 sc->sc_free = sc->sc_total; 1184 if (sc->sc_dinodes < 0) 1185 sc->sc_dinodes = 0; 1186 1187 return 0; 1188 } 1189 1190 /** 1191 * gfs2_statfs - Gather and return stats about the filesystem 1192 * @sb: The superblock 1193 * @statfsbuf: The buffer 1194 * 1195 * Returns: 0 on success or error code 1196 */ 1197 1198 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 1199 { 1200 struct super_block *sb = dentry->d_sb; 1201 struct gfs2_sbd *sdp = sb->s_fs_info; 1202 struct gfs2_statfs_change_host sc; 1203 int error; 1204 1205 error = gfs2_rindex_update(sdp); 1206 if (error) 1207 return error; 1208 1209 if (gfs2_tune_get(sdp, gt_statfs_slow)) 1210 error = gfs2_statfs_slow(sdp, &sc); 1211 else 1212 error = gfs2_statfs_i(sdp, &sc); 1213 1214 if (error) 1215 return error; 1216 1217 buf->f_type = GFS2_MAGIC; 1218 buf->f_bsize = sdp->sd_sb.sb_bsize; 1219 buf->f_blocks = sc.sc_total; 1220 buf->f_bfree = sc.sc_free; 1221 buf->f_bavail = sc.sc_free; 1222 buf->f_files = sc.sc_dinodes + sc.sc_free; 1223 buf->f_ffree = sc.sc_free; 1224 buf->f_namelen = GFS2_FNAMESIZE; 1225 1226 return 0; 1227 } 1228 1229 /** 1230 * gfs2_remount_fs - called when the FS is remounted 1231 * @sb: the filesystem 1232 * @flags: the remount flags 1233 * @data: extra data passed in (not used right now) 1234 * 1235 * Returns: errno 1236 */ 1237 1238 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) 1239 { 1240 struct gfs2_sbd *sdp = sb->s_fs_info; 1241 struct gfs2_args args = sdp->sd_args; /* Default to current settings */ 1242 struct gfs2_tune *gt = &sdp->sd_tune; 1243 int error; 1244 1245 sync_filesystem(sb); 1246 1247 spin_lock(>->gt_spin); 1248 args.ar_commit = gt->gt_logd_secs; 1249 args.ar_quota_quantum = gt->gt_quota_quantum; 1250 if (gt->gt_statfs_slow) 1251 args.ar_statfs_quantum = 0; 1252 else 1253 args.ar_statfs_quantum = gt->gt_statfs_quantum; 1254 spin_unlock(>->gt_spin); 1255 error = gfs2_mount_args(&args, data); 1256 if (error) 1257 return error; 1258 1259 /* Not allowed to change locking details */ 1260 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) || 1261 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) || 1262 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata)) 1263 return -EINVAL; 1264 1265 /* Some flags must not be changed */ 1266 if (args_neq(&args, &sdp->sd_args, spectator) || 1267 args_neq(&args, &sdp->sd_args, localflocks) || 1268 args_neq(&args, &sdp->sd_args, meta)) 1269 return -EINVAL; 1270 1271 if (sdp->sd_args.ar_spectator) 1272 *flags |= SB_RDONLY; 1273 1274 if ((sb->s_flags ^ *flags) & SB_RDONLY) { 1275 if (*flags & SB_RDONLY) 1276 error = gfs2_make_fs_ro(sdp); 1277 else 1278 error = gfs2_make_fs_rw(sdp); 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 error; 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 if (S_ISDIR(inode->i_mode) && 1635 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1636 error = gfs2_dir_exhash_dealloc(ip); 1637 if (error) 1638 goto out_unlock; 1639 } 1640 1641 if (ip->i_eattr) { 1642 error = gfs2_ea_dealloc(ip); 1643 if (error) 1644 goto out_unlock; 1645 } 1646 1647 if (!gfs2_is_stuffed(ip)) { 1648 error = gfs2_file_dealloc(ip); 1649 if (error) 1650 goto out_unlock; 1651 } 1652 1653 /* We're about to clear the bitmap for the dinode, but as soon as we 1654 do, gfs2_create_inode can create another inode at the same block 1655 location and try to set gl_object again. We clear gl_object here so 1656 that subsequent inode creates don't see an old gl_object. */ 1657 glock_clear_object(ip->i_gl, ip); 1658 error = gfs2_dinode_dealloc(ip); 1659 goto out_unlock; 1660 1661 out_truncate: 1662 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 1663 GFS2_LFC_EVICT_INODE); 1664 metamapping = gfs2_glock2aspace(ip->i_gl); 1665 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1666 filemap_fdatawrite(metamapping); 1667 filemap_fdatawait(metamapping); 1668 } 1669 write_inode_now(inode, 1); 1670 gfs2_ail_flush(ip->i_gl, 0); 1671 1672 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1673 if (error) 1674 goto out_unlock; 1675 /* Needs to be done before glock release & also in a transaction */ 1676 truncate_inode_pages(&inode->i_data, 0); 1677 truncate_inode_pages(metamapping, 0); 1678 gfs2_trans_end(sdp); 1679 1680 out_unlock: 1681 if (gfs2_rs_active(&ip->i_res)) 1682 gfs2_rs_deltree(&ip->i_res); 1683 1684 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1685 glock_clear_object(ip->i_iopen_gh.gh_gl, ip); 1686 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1687 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1688 gfs2_glock_dq(&ip->i_iopen_gh); 1689 } 1690 gfs2_holder_uninit(&ip->i_iopen_gh); 1691 } 1692 if (gfs2_holder_initialized(&gh)) { 1693 glock_clear_object(ip->i_gl, ip); 1694 gfs2_glock_dq_uninit(&gh); 1695 } 1696 if (error && error != GLR_TRYFAILED && error != -EROFS) 1697 fs_warn(sdp, "gfs2_evict_inode: %d\n", error); 1698 out: 1699 truncate_inode_pages_final(&inode->i_data); 1700 gfs2_rsqa_delete(ip, NULL); 1701 gfs2_ordered_del_inode(ip); 1702 clear_inode(inode); 1703 gfs2_dir_hash_inval(ip); 1704 glock_clear_object(ip->i_gl, ip); 1705 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE); 1706 gfs2_glock_add_to_lru(ip->i_gl); 1707 gfs2_glock_put_eventually(ip->i_gl); 1708 ip->i_gl = NULL; 1709 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1710 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1711 1712 glock_clear_object(gl, ip); 1713 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1714 gfs2_glock_hold(gl); 1715 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1716 gfs2_glock_put_eventually(gl); 1717 } 1718 } 1719 1720 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1721 { 1722 struct gfs2_inode *ip; 1723 1724 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1725 if (ip) { 1726 ip->i_flags = 0; 1727 ip->i_gl = NULL; 1728 memset(&ip->i_res, 0, sizeof(ip->i_res)); 1729 RB_CLEAR_NODE(&ip->i_res.rs_node); 1730 ip->i_rahead = 0; 1731 } 1732 return &ip->i_inode; 1733 } 1734 1735 static void gfs2_free_inode(struct inode *inode) 1736 { 1737 kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode)); 1738 } 1739 1740 const struct super_operations gfs2_super_ops = { 1741 .alloc_inode = gfs2_alloc_inode, 1742 .free_inode = gfs2_free_inode, 1743 .write_inode = gfs2_write_inode, 1744 .dirty_inode = gfs2_dirty_inode, 1745 .evict_inode = gfs2_evict_inode, 1746 .put_super = gfs2_put_super, 1747 .sync_fs = gfs2_sync_fs, 1748 .freeze_super = gfs2_freeze, 1749 .thaw_super = gfs2_unfreeze, 1750 .statfs = gfs2_statfs, 1751 .remount_fs = gfs2_remount_fs, 1752 .drop_inode = gfs2_drop_inode, 1753 .show_options = gfs2_show_options, 1754 }; 1755 1756