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; 757 758 if (wbc->sync_mode == WB_SYNC_ALL) 759 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, NORMAL_FLUSH); 760 if (bdi->wb.dirty_exceeded) 761 gfs2_ail1_flush(sdp, wbc); 762 else 763 filemap_fdatawrite(metamapping); 764 if (wbc->sync_mode == WB_SYNC_ALL) 765 ret = filemap_fdatawait(metamapping); 766 if (ret) 767 mark_inode_dirty_sync(inode); 768 return ret; 769 } 770 771 /** 772 * gfs2_dirty_inode - check for atime updates 773 * @inode: The inode in question 774 * @flags: The type of dirty 775 * 776 * Unfortunately it can be called under any combination of inode 777 * glock and transaction lock, so we have to check carefully. 778 * 779 * At the moment this deals only with atime - it should be possible 780 * to expand that role in future, once a review of the locking has 781 * been carried out. 782 */ 783 784 static void gfs2_dirty_inode(struct inode *inode, int flags) 785 { 786 struct gfs2_inode *ip = GFS2_I(inode); 787 struct gfs2_sbd *sdp = GFS2_SB(inode); 788 struct buffer_head *bh; 789 struct gfs2_holder gh; 790 int need_unlock = 0; 791 int need_endtrans = 0; 792 int ret; 793 794 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC))) 795 return; 796 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) 797 return; 798 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { 799 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 800 if (ret) { 801 fs_err(sdp, "dirty_inode: glock %d\n", ret); 802 return; 803 } 804 need_unlock = 1; 805 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) 806 return; 807 808 if (current->journal_info == NULL) { 809 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 810 if (ret) { 811 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); 812 goto out; 813 } 814 need_endtrans = 1; 815 } 816 817 ret = gfs2_meta_inode_buffer(ip, &bh); 818 if (ret == 0) { 819 gfs2_trans_add_meta(ip->i_gl, bh); 820 gfs2_dinode_out(ip, bh->b_data); 821 brelse(bh); 822 } 823 824 if (need_endtrans) 825 gfs2_trans_end(sdp); 826 out: 827 if (need_unlock) 828 gfs2_glock_dq_uninit(&gh); 829 } 830 831 /** 832 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 833 * @sdp: the filesystem 834 * 835 * Returns: errno 836 */ 837 838 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp) 839 { 840 struct gfs2_holder freeze_gh; 841 int error; 842 843 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE, 844 &freeze_gh); 845 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 846 return error; 847 848 kthread_stop(sdp->sd_quotad_process); 849 kthread_stop(sdp->sd_logd_process); 850 851 flush_workqueue(gfs2_delete_workqueue); 852 gfs2_quota_sync(sdp->sd_vfs, 0); 853 gfs2_statfs_sync(sdp->sd_vfs, 0); 854 855 gfs2_log_flush(sdp, NULL, SHUTDOWN_FLUSH); 856 wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0); 857 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks); 858 859 if (gfs2_holder_initialized(&freeze_gh)) 860 gfs2_glock_dq_uninit(&freeze_gh); 861 862 gfs2_quota_cleanup(sdp); 863 864 return error; 865 } 866 867 /** 868 * gfs2_put_super - Unmount the filesystem 869 * @sb: The VFS superblock 870 * 871 */ 872 873 static void gfs2_put_super(struct super_block *sb) 874 { 875 struct gfs2_sbd *sdp = sb->s_fs_info; 876 int error; 877 struct gfs2_jdesc *jd; 878 879 /* No more recovery requests */ 880 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 881 smp_mb(); 882 883 /* Wait on outstanding recovery */ 884 restart: 885 spin_lock(&sdp->sd_jindex_spin); 886 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 887 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 888 continue; 889 spin_unlock(&sdp->sd_jindex_spin); 890 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 891 TASK_UNINTERRUPTIBLE); 892 goto restart; 893 } 894 spin_unlock(&sdp->sd_jindex_spin); 895 896 if (!sb_rdonly(sb)) { 897 error = gfs2_make_fs_ro(sdp); 898 if (error) 899 gfs2_io_error(sdp); 900 } 901 /* At this point, we're through modifying the disk */ 902 903 /* Release stuff */ 904 905 iput(sdp->sd_jindex); 906 iput(sdp->sd_statfs_inode); 907 iput(sdp->sd_rindex); 908 iput(sdp->sd_quota_inode); 909 910 gfs2_glock_put(sdp->sd_rename_gl); 911 gfs2_glock_put(sdp->sd_freeze_gl); 912 913 if (!sdp->sd_args.ar_spectator) { 914 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 915 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 916 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 917 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 918 iput(sdp->sd_sc_inode); 919 iput(sdp->sd_qc_inode); 920 } 921 922 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 923 gfs2_clear_rgrpd(sdp); 924 gfs2_jindex_free(sdp); 925 /* Take apart glock structures and buffer lists */ 926 gfs2_gl_hash_clear(sdp); 927 gfs2_delete_debugfs_file(sdp); 928 /* Unmount the locking protocol */ 929 gfs2_lm_unmount(sdp); 930 931 /* At this point, we're through participating in the lockspace */ 932 gfs2_sys_fs_del(sdp); 933 } 934 935 /** 936 * gfs2_sync_fs - sync the filesystem 937 * @sb: the superblock 938 * 939 * Flushes the log to disk. 940 */ 941 942 static int gfs2_sync_fs(struct super_block *sb, int wait) 943 { 944 struct gfs2_sbd *sdp = sb->s_fs_info; 945 946 gfs2_quota_sync(sb, -1); 947 if (wait) 948 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH); 949 return sdp->sd_log_error; 950 } 951 952 void gfs2_freeze_func(struct work_struct *work) 953 { 954 int error; 955 struct gfs2_holder freeze_gh; 956 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work); 957 struct super_block *sb = sdp->sd_vfs; 958 959 atomic_inc(&sb->s_active); 960 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0, 961 &freeze_gh); 962 if (error) { 963 printk(KERN_INFO "GFS2: couln't get freeze lock : %d\n", error); 964 gfs2_assert_withdraw(sdp, 0); 965 } 966 else { 967 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 968 error = thaw_super(sb); 969 if (error) { 970 printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n", 971 error); 972 gfs2_assert_withdraw(sdp, 0); 973 } 974 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) 975 freeze_gh.gh_flags |= GL_NOCACHE; 976 gfs2_glock_dq_uninit(&freeze_gh); 977 } 978 deactivate_super(sb); 979 return; 980 } 981 982 /** 983 * gfs2_freeze - prevent further writes to the filesystem 984 * @sb: the VFS structure for the filesystem 985 * 986 */ 987 988 static int gfs2_freeze(struct super_block *sb) 989 { 990 struct gfs2_sbd *sdp = sb->s_fs_info; 991 int error = 0; 992 993 mutex_lock(&sdp->sd_freeze_mutex); 994 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) 995 goto out; 996 997 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { 998 error = -EINVAL; 999 goto out; 1000 } 1001 1002 for (;;) { 1003 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); 1004 if (!error) 1005 break; 1006 1007 switch (error) { 1008 case -EBUSY: 1009 fs_err(sdp, "waiting for recovery before freeze\n"); 1010 break; 1011 1012 default: 1013 fs_err(sdp, "error freezing FS: %d\n", error); 1014 break; 1015 } 1016 1017 fs_err(sdp, "retrying...\n"); 1018 msleep(1000); 1019 } 1020 error = 0; 1021 out: 1022 mutex_unlock(&sdp->sd_freeze_mutex); 1023 return error; 1024 } 1025 1026 /** 1027 * gfs2_unfreeze - reallow writes to the filesystem 1028 * @sb: the VFS structure for the filesystem 1029 * 1030 */ 1031 1032 static int gfs2_unfreeze(struct super_block *sb) 1033 { 1034 struct gfs2_sbd *sdp = sb->s_fs_info; 1035 1036 mutex_lock(&sdp->sd_freeze_mutex); 1037 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN || 1038 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) { 1039 mutex_unlock(&sdp->sd_freeze_mutex); 1040 return 0; 1041 } 1042 1043 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 1044 mutex_unlock(&sdp->sd_freeze_mutex); 1045 return 0; 1046 } 1047 1048 /** 1049 * statfs_fill - fill in the sg for a given RG 1050 * @rgd: the RG 1051 * @sc: the sc structure 1052 * 1053 * Returns: 0 on success, -ESTALE if the LVB is invalid 1054 */ 1055 1056 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 1057 struct gfs2_statfs_change_host *sc) 1058 { 1059 gfs2_rgrp_verify(rgd); 1060 sc->sc_total += rgd->rd_data; 1061 sc->sc_free += rgd->rd_free; 1062 sc->sc_dinodes += rgd->rd_dinodes; 1063 return 0; 1064 } 1065 1066 /** 1067 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 1068 * @sdp: the filesystem 1069 * @sc: the sc info that will be returned 1070 * 1071 * Any error (other than a signal) will cause this routine to fall back 1072 * to the synchronous version. 1073 * 1074 * FIXME: This really shouldn't busy wait like this. 1075 * 1076 * Returns: errno 1077 */ 1078 1079 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1080 { 1081 struct gfs2_rgrpd *rgd_next; 1082 struct gfs2_holder *gha, *gh; 1083 unsigned int slots = 64; 1084 unsigned int x; 1085 int done; 1086 int error = 0, err; 1087 1088 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 1089 gha = kmalloc(slots * sizeof(struct gfs2_holder), GFP_KERNEL); 1090 if (!gha) 1091 return -ENOMEM; 1092 for (x = 0; x < slots; x++) 1093 gfs2_holder_mark_uninitialized(gha + x); 1094 1095 rgd_next = gfs2_rgrpd_get_first(sdp); 1096 1097 for (;;) { 1098 done = 1; 1099 1100 for (x = 0; x < slots; x++) { 1101 gh = gha + x; 1102 1103 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) { 1104 err = gfs2_glock_wait(gh); 1105 if (err) { 1106 gfs2_holder_uninit(gh); 1107 error = err; 1108 } else { 1109 if (!error) { 1110 struct gfs2_rgrpd *rgd = 1111 gfs2_glock2rgrp(gh->gh_gl); 1112 1113 error = statfs_slow_fill(rgd, sc); 1114 } 1115 gfs2_glock_dq_uninit(gh); 1116 } 1117 } 1118 1119 if (gfs2_holder_initialized(gh)) 1120 done = 0; 1121 else if (rgd_next && !error) { 1122 error = gfs2_glock_nq_init(rgd_next->rd_gl, 1123 LM_ST_SHARED, 1124 GL_ASYNC, 1125 gh); 1126 rgd_next = gfs2_rgrpd_get_next(rgd_next); 1127 done = 0; 1128 } 1129 1130 if (signal_pending(current)) 1131 error = -ERESTARTSYS; 1132 } 1133 1134 if (done) 1135 break; 1136 1137 yield(); 1138 } 1139 1140 kfree(gha); 1141 return error; 1142 } 1143 1144 /** 1145 * gfs2_statfs_i - Do a statfs 1146 * @sdp: the filesystem 1147 * @sg: the sg structure 1148 * 1149 * Returns: errno 1150 */ 1151 1152 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1153 { 1154 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 1155 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 1156 1157 spin_lock(&sdp->sd_statfs_spin); 1158 1159 *sc = *m_sc; 1160 sc->sc_total += l_sc->sc_total; 1161 sc->sc_free += l_sc->sc_free; 1162 sc->sc_dinodes += l_sc->sc_dinodes; 1163 1164 spin_unlock(&sdp->sd_statfs_spin); 1165 1166 if (sc->sc_free < 0) 1167 sc->sc_free = 0; 1168 if (sc->sc_free > sc->sc_total) 1169 sc->sc_free = sc->sc_total; 1170 if (sc->sc_dinodes < 0) 1171 sc->sc_dinodes = 0; 1172 1173 return 0; 1174 } 1175 1176 /** 1177 * gfs2_statfs - Gather and return stats about the filesystem 1178 * @sb: The superblock 1179 * @statfsbuf: The buffer 1180 * 1181 * Returns: 0 on success or error code 1182 */ 1183 1184 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 1185 { 1186 struct super_block *sb = dentry->d_sb; 1187 struct gfs2_sbd *sdp = sb->s_fs_info; 1188 struct gfs2_statfs_change_host sc; 1189 int error; 1190 1191 error = gfs2_rindex_update(sdp); 1192 if (error) 1193 return error; 1194 1195 if (gfs2_tune_get(sdp, gt_statfs_slow)) 1196 error = gfs2_statfs_slow(sdp, &sc); 1197 else 1198 error = gfs2_statfs_i(sdp, &sc); 1199 1200 if (error) 1201 return error; 1202 1203 buf->f_type = GFS2_MAGIC; 1204 buf->f_bsize = sdp->sd_sb.sb_bsize; 1205 buf->f_blocks = sc.sc_total; 1206 buf->f_bfree = sc.sc_free; 1207 buf->f_bavail = sc.sc_free; 1208 buf->f_files = sc.sc_dinodes + sc.sc_free; 1209 buf->f_ffree = sc.sc_free; 1210 buf->f_namelen = GFS2_FNAMESIZE; 1211 1212 return 0; 1213 } 1214 1215 /** 1216 * gfs2_remount_fs - called when the FS is remounted 1217 * @sb: the filesystem 1218 * @flags: the remount flags 1219 * @data: extra data passed in (not used right now) 1220 * 1221 * Returns: errno 1222 */ 1223 1224 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) 1225 { 1226 struct gfs2_sbd *sdp = sb->s_fs_info; 1227 struct gfs2_args args = sdp->sd_args; /* Default to current settings */ 1228 struct gfs2_tune *gt = &sdp->sd_tune; 1229 int error; 1230 1231 sync_filesystem(sb); 1232 1233 spin_lock(>->gt_spin); 1234 args.ar_commit = gt->gt_logd_secs; 1235 args.ar_quota_quantum = gt->gt_quota_quantum; 1236 if (gt->gt_statfs_slow) 1237 args.ar_statfs_quantum = 0; 1238 else 1239 args.ar_statfs_quantum = gt->gt_statfs_quantum; 1240 spin_unlock(>->gt_spin); 1241 error = gfs2_mount_args(&args, data); 1242 if (error) 1243 return error; 1244 1245 /* Not allowed to change locking details */ 1246 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) || 1247 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) || 1248 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata)) 1249 return -EINVAL; 1250 1251 /* Some flags must not be changed */ 1252 if (args_neq(&args, &sdp->sd_args, spectator) || 1253 args_neq(&args, &sdp->sd_args, localflocks) || 1254 args_neq(&args, &sdp->sd_args, meta)) 1255 return -EINVAL; 1256 1257 if (sdp->sd_args.ar_spectator) 1258 *flags |= MS_RDONLY; 1259 1260 if ((sb->s_flags ^ *flags) & MS_RDONLY) { 1261 if (*flags & MS_RDONLY) 1262 error = gfs2_make_fs_ro(sdp); 1263 else 1264 error = gfs2_make_fs_rw(sdp); 1265 if (error) 1266 return error; 1267 } 1268 1269 sdp->sd_args = args; 1270 if (sdp->sd_args.ar_posix_acl) 1271 sb->s_flags |= MS_POSIXACL; 1272 else 1273 sb->s_flags &= ~MS_POSIXACL; 1274 if (sdp->sd_args.ar_nobarrier) 1275 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1276 else 1277 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1278 spin_lock(>->gt_spin); 1279 gt->gt_logd_secs = args.ar_commit; 1280 gt->gt_quota_quantum = args.ar_quota_quantum; 1281 if (args.ar_statfs_quantum) { 1282 gt->gt_statfs_slow = 0; 1283 gt->gt_statfs_quantum = args.ar_statfs_quantum; 1284 } 1285 else { 1286 gt->gt_statfs_slow = 1; 1287 gt->gt_statfs_quantum = 30; 1288 } 1289 spin_unlock(>->gt_spin); 1290 1291 gfs2_online_uevent(sdp); 1292 return 0; 1293 } 1294 1295 /** 1296 * gfs2_drop_inode - Drop an inode (test for remote unlink) 1297 * @inode: The inode to drop 1298 * 1299 * If we've received a callback on an iopen lock then it's because a 1300 * remote node tried to deallocate the inode but failed due to this node 1301 * still having the inode open. Here we mark the link count zero 1302 * since we know that it must have reached zero if the GLF_DEMOTE flag 1303 * is set on the iopen glock. If we didn't do a disk read since the 1304 * remote node removed the final link then we might otherwise miss 1305 * this event. This check ensures that this node will deallocate the 1306 * inode's blocks, or alternatively pass the baton on to another 1307 * node for later deallocation. 1308 */ 1309 1310 static int gfs2_drop_inode(struct inode *inode) 1311 { 1312 struct gfs2_inode *ip = GFS2_I(inode); 1313 1314 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && 1315 inode->i_nlink && 1316 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1317 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1318 if (test_bit(GLF_DEMOTE, &gl->gl_flags)) 1319 clear_nlink(inode); 1320 } 1321 1322 /* 1323 * When under memory pressure when an inode's link count has dropped to 1324 * zero, defer deleting the inode to the delete workqueue. This avoids 1325 * calling into DLM under memory pressure, which can deadlock. 1326 */ 1327 if (!inode->i_nlink && 1328 unlikely(current->flags & PF_MEMALLOC) && 1329 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1330 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1331 1332 gfs2_glock_hold(gl); 1333 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0) 1334 gfs2_glock_queue_put(gl); 1335 return false; 1336 } 1337 1338 return generic_drop_inode(inode); 1339 } 1340 1341 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 1342 { 1343 do { 1344 if (d1 == d2) 1345 return 1; 1346 d1 = d1->d_parent; 1347 } while (!IS_ROOT(d1)); 1348 return 0; 1349 } 1350 1351 /** 1352 * gfs2_show_options - Show mount options for /proc/mounts 1353 * @s: seq_file structure 1354 * @root: root of this (sub)tree 1355 * 1356 * Returns: 0 on success or error code 1357 */ 1358 1359 static int gfs2_show_options(struct seq_file *s, struct dentry *root) 1360 { 1361 struct gfs2_sbd *sdp = root->d_sb->s_fs_info; 1362 struct gfs2_args *args = &sdp->sd_args; 1363 int val; 1364 1365 if (is_ancestor(root, sdp->sd_master_dir)) 1366 seq_puts(s, ",meta"); 1367 if (args->ar_lockproto[0]) 1368 seq_show_option(s, "lockproto", args->ar_lockproto); 1369 if (args->ar_locktable[0]) 1370 seq_show_option(s, "locktable", args->ar_locktable); 1371 if (args->ar_hostdata[0]) 1372 seq_show_option(s, "hostdata", args->ar_hostdata); 1373 if (args->ar_spectator) 1374 seq_puts(s, ",spectator"); 1375 if (args->ar_localflocks) 1376 seq_puts(s, ",localflocks"); 1377 if (args->ar_debug) 1378 seq_puts(s, ",debug"); 1379 if (args->ar_posix_acl) 1380 seq_puts(s, ",acl"); 1381 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 1382 char *state; 1383 switch (args->ar_quota) { 1384 case GFS2_QUOTA_OFF: 1385 state = "off"; 1386 break; 1387 case GFS2_QUOTA_ACCOUNT: 1388 state = "account"; 1389 break; 1390 case GFS2_QUOTA_ON: 1391 state = "on"; 1392 break; 1393 default: 1394 state = "unknown"; 1395 break; 1396 } 1397 seq_printf(s, ",quota=%s", state); 1398 } 1399 if (args->ar_suiddir) 1400 seq_puts(s, ",suiddir"); 1401 if (args->ar_data != GFS2_DATA_DEFAULT) { 1402 char *state; 1403 switch (args->ar_data) { 1404 case GFS2_DATA_WRITEBACK: 1405 state = "writeback"; 1406 break; 1407 case GFS2_DATA_ORDERED: 1408 state = "ordered"; 1409 break; 1410 default: 1411 state = "unknown"; 1412 break; 1413 } 1414 seq_printf(s, ",data=%s", state); 1415 } 1416 if (args->ar_discard) 1417 seq_puts(s, ",discard"); 1418 val = sdp->sd_tune.gt_logd_secs; 1419 if (val != 30) 1420 seq_printf(s, ",commit=%d", val); 1421 val = sdp->sd_tune.gt_statfs_quantum; 1422 if (val != 30) 1423 seq_printf(s, ",statfs_quantum=%d", val); 1424 else if (sdp->sd_tune.gt_statfs_slow) 1425 seq_puts(s, ",statfs_quantum=0"); 1426 val = sdp->sd_tune.gt_quota_quantum; 1427 if (val != 60) 1428 seq_printf(s, ",quota_quantum=%d", val); 1429 if (args->ar_statfs_percent) 1430 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1431 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1432 const char *state; 1433 1434 switch (args->ar_errors) { 1435 case GFS2_ERRORS_WITHDRAW: 1436 state = "withdraw"; 1437 break; 1438 case GFS2_ERRORS_PANIC: 1439 state = "panic"; 1440 break; 1441 default: 1442 state = "unknown"; 1443 break; 1444 } 1445 seq_printf(s, ",errors=%s", state); 1446 } 1447 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1448 seq_puts(s, ",nobarrier"); 1449 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1450 seq_puts(s, ",demote_interface_used"); 1451 if (args->ar_rgrplvb) 1452 seq_puts(s, ",rgrplvb"); 1453 if (args->ar_loccookie) 1454 seq_puts(s, ",loccookie"); 1455 return 0; 1456 } 1457 1458 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1459 { 1460 struct inode *inode = &ip->i_inode; 1461 struct gfs2_glock *gl = ip->i_gl; 1462 1463 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1464 truncate_inode_pages(&inode->i_data, 0); 1465 1466 if (atomic_read(&gl->gl_revokes) == 0) { 1467 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1468 clear_bit(GLF_DIRTY, &gl->gl_flags); 1469 } 1470 } 1471 1472 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1473 { 1474 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1475 struct gfs2_rgrpd *rgd; 1476 struct gfs2_holder gh; 1477 int error; 1478 1479 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1480 gfs2_consist_inode(ip); 1481 return -EIO; 1482 } 1483 1484 error = gfs2_rindex_update(sdp); 1485 if (error) 1486 return error; 1487 1488 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 1489 if (error) 1490 return error; 1491 1492 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1493 if (!rgd) { 1494 gfs2_consist_inode(ip); 1495 error = -EIO; 1496 goto out_qs; 1497 } 1498 1499 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh); 1500 if (error) 1501 goto out_qs; 1502 1503 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1504 sdp->sd_jdesc->jd_blocks); 1505 if (error) 1506 goto out_rg_gunlock; 1507 1508 gfs2_free_di(rgd, ip); 1509 1510 gfs2_final_release_pages(ip); 1511 1512 gfs2_trans_end(sdp); 1513 1514 out_rg_gunlock: 1515 gfs2_glock_dq_uninit(&gh); 1516 out_qs: 1517 gfs2_quota_unhold(ip); 1518 return error; 1519 } 1520 1521 /** 1522 * gfs2_glock_put_eventually 1523 * @gl: The glock to put 1524 * 1525 * When under memory pressure, trigger a deferred glock put to make sure we 1526 * won't call into DLM and deadlock. Otherwise, put the glock directly. 1527 */ 1528 1529 static void gfs2_glock_put_eventually(struct gfs2_glock *gl) 1530 { 1531 if (current->flags & PF_MEMALLOC) 1532 gfs2_glock_queue_put(gl); 1533 else 1534 gfs2_glock_put(gl); 1535 } 1536 1537 /** 1538 * gfs2_evict_inode - Remove an inode from cache 1539 * @inode: The inode to evict 1540 * 1541 * There are three cases to consider: 1542 * 1. i_nlink == 0, we are final opener (and must deallocate) 1543 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1544 * 3. i_nlink > 0 1545 * 1546 * If the fs is read only, then we have to treat all cases as per #3 1547 * since we are unable to do any deallocation. The inode will be 1548 * deallocated by the next read/write node to attempt an allocation 1549 * in the same resource group 1550 * 1551 * We have to (at the moment) hold the inodes main lock to cover 1552 * the gap between unlocking the shared lock on the iopen lock and 1553 * taking the exclusive lock. I'd rather do a shared -> exclusive 1554 * conversion on the iopen lock, but we can change that later. This 1555 * is safe, just less efficient. 1556 */ 1557 1558 static void gfs2_evict_inode(struct inode *inode) 1559 { 1560 struct super_block *sb = inode->i_sb; 1561 struct gfs2_sbd *sdp = sb->s_fs_info; 1562 struct gfs2_inode *ip = GFS2_I(inode); 1563 struct gfs2_holder gh; 1564 struct address_space *metamapping; 1565 int error; 1566 1567 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) { 1568 clear_inode(inode); 1569 return; 1570 } 1571 1572 if (inode->i_nlink || sb_rdonly(sb)) 1573 goto out; 1574 1575 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { 1576 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl)); 1577 gfs2_holder_mark_uninitialized(&gh); 1578 goto alloc_failed; 1579 } 1580 1581 /* Deletes should never happen under memory pressure anymore. */ 1582 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC)) 1583 goto out; 1584 1585 /* Must not read inode block until block type has been verified */ 1586 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 1587 if (unlikely(error)) { 1588 glock_clear_object(ip->i_iopen_gh.gh_gl, ip); 1589 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1590 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1591 goto out; 1592 } 1593 1594 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1595 if (error) 1596 goto out_truncate; 1597 1598 if (test_bit(GIF_INVALID, &ip->i_flags)) { 1599 error = gfs2_inode_refresh(ip); 1600 if (error) 1601 goto out_truncate; 1602 } 1603 1604 /* 1605 * The inode may have been recreated in the meantime. 1606 */ 1607 if (inode->i_nlink) 1608 goto out_truncate; 1609 1610 alloc_failed: 1611 if (gfs2_holder_initialized(&ip->i_iopen_gh) && 1612 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1613 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1614 gfs2_glock_dq_wait(&ip->i_iopen_gh); 1615 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, 1616 &ip->i_iopen_gh); 1617 error = gfs2_glock_nq(&ip->i_iopen_gh); 1618 if (error) 1619 goto out_truncate; 1620 } 1621 1622 /* Case 1 starts here */ 1623 1624 if (S_ISDIR(inode->i_mode) && 1625 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1626 error = gfs2_dir_exhash_dealloc(ip); 1627 if (error) 1628 goto out_unlock; 1629 } 1630 1631 if (ip->i_eattr) { 1632 error = gfs2_ea_dealloc(ip); 1633 if (error) 1634 goto out_unlock; 1635 } 1636 1637 if (!gfs2_is_stuffed(ip)) { 1638 error = gfs2_file_dealloc(ip); 1639 if (error) 1640 goto out_unlock; 1641 } 1642 1643 /* We're about to clear the bitmap for the dinode, but as soon as we 1644 do, gfs2_create_inode can create another inode at the same block 1645 location and try to set gl_object again. We clear gl_object here so 1646 that subsequent inode creates don't see an old gl_object. */ 1647 glock_clear_object(ip->i_gl, ip); 1648 error = gfs2_dinode_dealloc(ip); 1649 goto out_unlock; 1650 1651 out_truncate: 1652 gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH); 1653 metamapping = gfs2_glock2aspace(ip->i_gl); 1654 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1655 filemap_fdatawrite(metamapping); 1656 filemap_fdatawait(metamapping); 1657 } 1658 write_inode_now(inode, 1); 1659 gfs2_ail_flush(ip->i_gl, 0); 1660 1661 /* Case 2 starts here */ 1662 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1663 if (error) 1664 goto out_unlock; 1665 /* Needs to be done before glock release & also in a transaction */ 1666 truncate_inode_pages(&inode->i_data, 0); 1667 truncate_inode_pages(metamapping, 0); 1668 gfs2_trans_end(sdp); 1669 1670 out_unlock: 1671 /* Error path for case 1 */ 1672 if (gfs2_rs_active(&ip->i_res)) 1673 gfs2_rs_deltree(&ip->i_res); 1674 1675 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1676 glock_clear_object(ip->i_iopen_gh.gh_gl, ip); 1677 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1678 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1679 gfs2_glock_dq(&ip->i_iopen_gh); 1680 } 1681 gfs2_holder_uninit(&ip->i_iopen_gh); 1682 } 1683 if (gfs2_holder_initialized(&gh)) { 1684 glock_clear_object(ip->i_gl, ip); 1685 gfs2_glock_dq_uninit(&gh); 1686 } 1687 if (error && error != GLR_TRYFAILED && error != -EROFS) 1688 fs_warn(sdp, "gfs2_evict_inode: %d\n", error); 1689 out: 1690 /* Case 3 starts here */ 1691 truncate_inode_pages_final(&inode->i_data); 1692 gfs2_rsqa_delete(ip, NULL); 1693 gfs2_ordered_del_inode(ip); 1694 clear_inode(inode); 1695 gfs2_dir_hash_inval(ip); 1696 glock_clear_object(ip->i_gl, ip); 1697 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE); 1698 gfs2_glock_add_to_lru(ip->i_gl); 1699 gfs2_glock_put_eventually(ip->i_gl); 1700 ip->i_gl = NULL; 1701 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1702 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1703 1704 glock_clear_object(gl, ip); 1705 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1706 gfs2_glock_hold(gl); 1707 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1708 gfs2_glock_put_eventually(gl); 1709 } 1710 } 1711 1712 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1713 { 1714 struct gfs2_inode *ip; 1715 1716 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1717 if (ip) { 1718 ip->i_flags = 0; 1719 ip->i_gl = NULL; 1720 ip->i_rgd = NULL; 1721 memset(&ip->i_res, 0, sizeof(ip->i_res)); 1722 RB_CLEAR_NODE(&ip->i_res.rs_node); 1723 ip->i_rahead = 0; 1724 } 1725 return &ip->i_inode; 1726 } 1727 1728 static void gfs2_i_callback(struct rcu_head *head) 1729 { 1730 struct inode *inode = container_of(head, struct inode, i_rcu); 1731 kmem_cache_free(gfs2_inode_cachep, inode); 1732 } 1733 1734 static void gfs2_destroy_inode(struct inode *inode) 1735 { 1736 call_rcu(&inode->i_rcu, gfs2_i_callback); 1737 } 1738 1739 const struct super_operations gfs2_super_ops = { 1740 .alloc_inode = gfs2_alloc_inode, 1741 .destroy_inode = gfs2_destroy_inode, 1742 .write_inode = gfs2_write_inode, 1743 .dirty_inode = gfs2_dirty_inode, 1744 .evict_inode = gfs2_evict_inode, 1745 .put_super = gfs2_put_super, 1746 .sync_fs = gfs2_sync_fs, 1747 .freeze_super = gfs2_freeze, 1748 .thaw_super = gfs2_unfreeze, 1749 .statfs = gfs2_statfs, 1750 .remount_fs = gfs2_remount_fs, 1751 .drop_inode = gfs2_drop_inode, 1752 .show_options = gfs2_show_options, 1753 }; 1754 1755