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