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