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 #include <linux/bio.h> 11 #include <linux/sched.h> 12 #include <linux/slab.h> 13 #include <linux/spinlock.h> 14 #include <linux/completion.h> 15 #include <linux/buffer_head.h> 16 #include <linux/statfs.h> 17 #include <linux/seq_file.h> 18 #include <linux/mount.h> 19 #include <linux/kthread.h> 20 #include <linux/delay.h> 21 #include <linux/gfs2_ondisk.h> 22 #include <linux/crc32.h> 23 #include <linux/time.h> 24 #include <linux/wait.h> 25 #include <linux/writeback.h> 26 #include <linux/backing-dev.h> 27 28 #include "gfs2.h" 29 #include "incore.h" 30 #include "bmap.h" 31 #include "dir.h" 32 #include "glock.h" 33 #include "glops.h" 34 #include "inode.h" 35 #include "log.h" 36 #include "meta_io.h" 37 #include "quota.h" 38 #include "recovery.h" 39 #include "rgrp.h" 40 #include "super.h" 41 #include "trans.h" 42 #include "util.h" 43 #include "sys.h" 44 #include "xattr.h" 45 46 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x) 47 48 enum { 49 Opt_lockproto, 50 Opt_locktable, 51 Opt_hostdata, 52 Opt_spectator, 53 Opt_ignore_local_fs, 54 Opt_localflocks, 55 Opt_localcaching, 56 Opt_debug, 57 Opt_nodebug, 58 Opt_upgrade, 59 Opt_acl, 60 Opt_noacl, 61 Opt_quota_off, 62 Opt_quota_account, 63 Opt_quota_on, 64 Opt_quota, 65 Opt_noquota, 66 Opt_suiddir, 67 Opt_nosuiddir, 68 Opt_data_writeback, 69 Opt_data_ordered, 70 Opt_meta, 71 Opt_discard, 72 Opt_nodiscard, 73 Opt_commit, 74 Opt_err_withdraw, 75 Opt_err_panic, 76 Opt_statfs_quantum, 77 Opt_statfs_percent, 78 Opt_quota_quantum, 79 Opt_barrier, 80 Opt_nobarrier, 81 Opt_error, 82 }; 83 84 static const match_table_t tokens = { 85 {Opt_lockproto, "lockproto=%s"}, 86 {Opt_locktable, "locktable=%s"}, 87 {Opt_hostdata, "hostdata=%s"}, 88 {Opt_spectator, "spectator"}, 89 {Opt_spectator, "norecovery"}, 90 {Opt_ignore_local_fs, "ignore_local_fs"}, 91 {Opt_localflocks, "localflocks"}, 92 {Opt_localcaching, "localcaching"}, 93 {Opt_debug, "debug"}, 94 {Opt_nodebug, "nodebug"}, 95 {Opt_upgrade, "upgrade"}, 96 {Opt_acl, "acl"}, 97 {Opt_noacl, "noacl"}, 98 {Opt_quota_off, "quota=off"}, 99 {Opt_quota_account, "quota=account"}, 100 {Opt_quota_on, "quota=on"}, 101 {Opt_quota, "quota"}, 102 {Opt_noquota, "noquota"}, 103 {Opt_suiddir, "suiddir"}, 104 {Opt_nosuiddir, "nosuiddir"}, 105 {Opt_data_writeback, "data=writeback"}, 106 {Opt_data_ordered, "data=ordered"}, 107 {Opt_meta, "meta"}, 108 {Opt_discard, "discard"}, 109 {Opt_nodiscard, "nodiscard"}, 110 {Opt_commit, "commit=%d"}, 111 {Opt_err_withdraw, "errors=withdraw"}, 112 {Opt_err_panic, "errors=panic"}, 113 {Opt_statfs_quantum, "statfs_quantum=%d"}, 114 {Opt_statfs_percent, "statfs_percent=%d"}, 115 {Opt_quota_quantum, "quota_quantum=%d"}, 116 {Opt_barrier, "barrier"}, 117 {Opt_nobarrier, "nobarrier"}, 118 {Opt_error, NULL} 119 }; 120 121 /** 122 * gfs2_mount_args - Parse mount options 123 * @args: The structure into which the parsed options will be written 124 * @options: The options to parse 125 * 126 * Return: errno 127 */ 128 129 int gfs2_mount_args(struct gfs2_args *args, char *options) 130 { 131 char *o; 132 int token; 133 substring_t tmp[MAX_OPT_ARGS]; 134 int rv; 135 136 /* Split the options into tokens with the "," character and 137 process them */ 138 139 while (1) { 140 o = strsep(&options, ","); 141 if (o == NULL) 142 break; 143 if (*o == '\0') 144 continue; 145 146 token = match_token(o, tokens, tmp); 147 switch (token) { 148 case Opt_lockproto: 149 match_strlcpy(args->ar_lockproto, &tmp[0], 150 GFS2_LOCKNAME_LEN); 151 break; 152 case Opt_locktable: 153 match_strlcpy(args->ar_locktable, &tmp[0], 154 GFS2_LOCKNAME_LEN); 155 break; 156 case Opt_hostdata: 157 match_strlcpy(args->ar_hostdata, &tmp[0], 158 GFS2_LOCKNAME_LEN); 159 break; 160 case Opt_spectator: 161 args->ar_spectator = 1; 162 break; 163 case Opt_ignore_local_fs: 164 /* Retained for backwards compat only */ 165 break; 166 case Opt_localflocks: 167 args->ar_localflocks = 1; 168 break; 169 case Opt_localcaching: 170 /* Retained for backwards compat only */ 171 break; 172 case Opt_debug: 173 if (args->ar_errors == GFS2_ERRORS_PANIC) { 174 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic " 175 "are mutually exclusive.\n"); 176 return -EINVAL; 177 } 178 args->ar_debug = 1; 179 break; 180 case Opt_nodebug: 181 args->ar_debug = 0; 182 break; 183 case Opt_upgrade: 184 /* Retained for backwards compat only */ 185 break; 186 case Opt_acl: 187 args->ar_posix_acl = 1; 188 break; 189 case Opt_noacl: 190 args->ar_posix_acl = 0; 191 break; 192 case Opt_quota_off: 193 case Opt_noquota: 194 args->ar_quota = GFS2_QUOTA_OFF; 195 break; 196 case Opt_quota_account: 197 args->ar_quota = GFS2_QUOTA_ACCOUNT; 198 break; 199 case Opt_quota_on: 200 case Opt_quota: 201 args->ar_quota = GFS2_QUOTA_ON; 202 break; 203 case Opt_suiddir: 204 args->ar_suiddir = 1; 205 break; 206 case Opt_nosuiddir: 207 args->ar_suiddir = 0; 208 break; 209 case Opt_data_writeback: 210 args->ar_data = GFS2_DATA_WRITEBACK; 211 break; 212 case Opt_data_ordered: 213 args->ar_data = GFS2_DATA_ORDERED; 214 break; 215 case Opt_meta: 216 args->ar_meta = 1; 217 break; 218 case Opt_discard: 219 args->ar_discard = 1; 220 break; 221 case Opt_nodiscard: 222 args->ar_discard = 0; 223 break; 224 case Opt_commit: 225 rv = match_int(&tmp[0], &args->ar_commit); 226 if (rv || args->ar_commit <= 0) { 227 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n"); 228 return rv ? rv : -EINVAL; 229 } 230 break; 231 case Opt_statfs_quantum: 232 rv = match_int(&tmp[0], &args->ar_statfs_quantum); 233 if (rv || args->ar_statfs_quantum < 0) { 234 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n"); 235 return rv ? rv : -EINVAL; 236 } 237 break; 238 case Opt_quota_quantum: 239 rv = match_int(&tmp[0], &args->ar_quota_quantum); 240 if (rv || args->ar_quota_quantum <= 0) { 241 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n"); 242 return rv ? rv : -EINVAL; 243 } 244 break; 245 case Opt_statfs_percent: 246 rv = match_int(&tmp[0], &args->ar_statfs_percent); 247 if (rv || args->ar_statfs_percent < 0 || 248 args->ar_statfs_percent > 100) { 249 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n"); 250 return rv ? rv : -EINVAL; 251 } 252 break; 253 case Opt_err_withdraw: 254 args->ar_errors = GFS2_ERRORS_WITHDRAW; 255 break; 256 case Opt_err_panic: 257 if (args->ar_debug) { 258 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic " 259 "are mutually exclusive.\n"); 260 return -EINVAL; 261 } 262 args->ar_errors = GFS2_ERRORS_PANIC; 263 break; 264 case Opt_barrier: 265 args->ar_nobarrier = 0; 266 break; 267 case Opt_nobarrier: 268 args->ar_nobarrier = 1; 269 break; 270 case Opt_error: 271 default: 272 printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o); 273 return -EINVAL; 274 } 275 } 276 277 return 0; 278 } 279 280 /** 281 * gfs2_jindex_free - Clear all the journal index information 282 * @sdp: The GFS2 superblock 283 * 284 */ 285 286 void gfs2_jindex_free(struct gfs2_sbd *sdp) 287 { 288 struct list_head list, *head; 289 struct gfs2_jdesc *jd; 290 struct gfs2_journal_extent *jext; 291 292 spin_lock(&sdp->sd_jindex_spin); 293 list_add(&list, &sdp->sd_jindex_list); 294 list_del_init(&sdp->sd_jindex_list); 295 sdp->sd_journals = 0; 296 spin_unlock(&sdp->sd_jindex_spin); 297 298 while (!list_empty(&list)) { 299 jd = list_entry(list.next, struct gfs2_jdesc, jd_list); 300 head = &jd->extent_list; 301 while (!list_empty(head)) { 302 jext = list_entry(head->next, 303 struct gfs2_journal_extent, 304 extent_list); 305 list_del(&jext->extent_list); 306 kfree(jext); 307 } 308 list_del(&jd->jd_list); 309 iput(jd->jd_inode); 310 kfree(jd); 311 } 312 } 313 314 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) 315 { 316 struct gfs2_jdesc *jd; 317 int found = 0; 318 319 list_for_each_entry(jd, head, jd_list) { 320 if (jd->jd_jid == jid) { 321 found = 1; 322 break; 323 } 324 } 325 326 if (!found) 327 jd = NULL; 328 329 return jd; 330 } 331 332 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) 333 { 334 struct gfs2_jdesc *jd; 335 336 spin_lock(&sdp->sd_jindex_spin); 337 jd = jdesc_find_i(&sdp->sd_jindex_list, jid); 338 spin_unlock(&sdp->sd_jindex_spin); 339 340 return jd; 341 } 342 343 int gfs2_jdesc_check(struct gfs2_jdesc *jd) 344 { 345 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 346 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 347 u64 size = i_size_read(jd->jd_inode); 348 349 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30)) 350 return -EIO; 351 352 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift; 353 354 if (gfs2_write_alloc_required(ip, 0, size)) { 355 gfs2_consist_inode(ip); 356 return -EIO; 357 } 358 359 return 0; 360 } 361 362 /** 363 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one 364 * @sdp: the filesystem 365 * 366 * Returns: errno 367 */ 368 369 int gfs2_make_fs_rw(struct gfs2_sbd *sdp) 370 { 371 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 372 struct gfs2_glock *j_gl = ip->i_gl; 373 struct gfs2_holder t_gh; 374 struct gfs2_log_header_host head; 375 int error; 376 377 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh); 378 if (error) 379 return error; 380 381 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 382 383 error = gfs2_find_jhead(sdp->sd_jdesc, &head); 384 if (error) 385 goto fail; 386 387 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 388 gfs2_consist(sdp); 389 error = -EIO; 390 goto fail; 391 } 392 393 /* Initialize some head of the log stuff */ 394 sdp->sd_log_sequence = head.lh_sequence + 1; 395 gfs2_log_pointers_init(sdp, head.lh_blkno); 396 397 error = gfs2_quota_init(sdp); 398 if (error) 399 goto fail; 400 401 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 402 403 gfs2_glock_dq_uninit(&t_gh); 404 405 return 0; 406 407 fail: 408 t_gh.gh_flags |= GL_NOCACHE; 409 gfs2_glock_dq_uninit(&t_gh); 410 411 return error; 412 } 413 414 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) 415 { 416 const struct gfs2_statfs_change *str = buf; 417 418 sc->sc_total = be64_to_cpu(str->sc_total); 419 sc->sc_free = be64_to_cpu(str->sc_free); 420 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); 421 } 422 423 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) 424 { 425 struct gfs2_statfs_change *str = buf; 426 427 str->sc_total = cpu_to_be64(sc->sc_total); 428 str->sc_free = cpu_to_be64(sc->sc_free); 429 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); 430 } 431 432 int gfs2_statfs_init(struct gfs2_sbd *sdp) 433 { 434 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 435 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 436 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 437 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 438 struct buffer_head *m_bh, *l_bh; 439 struct gfs2_holder gh; 440 int error; 441 442 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 443 &gh); 444 if (error) 445 return error; 446 447 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 448 if (error) 449 goto out; 450 451 if (sdp->sd_args.ar_spectator) { 452 spin_lock(&sdp->sd_statfs_spin); 453 gfs2_statfs_change_in(m_sc, m_bh->b_data + 454 sizeof(struct gfs2_dinode)); 455 spin_unlock(&sdp->sd_statfs_spin); 456 } else { 457 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 458 if (error) 459 goto out_m_bh; 460 461 spin_lock(&sdp->sd_statfs_spin); 462 gfs2_statfs_change_in(m_sc, m_bh->b_data + 463 sizeof(struct gfs2_dinode)); 464 gfs2_statfs_change_in(l_sc, l_bh->b_data + 465 sizeof(struct gfs2_dinode)); 466 spin_unlock(&sdp->sd_statfs_spin); 467 468 brelse(l_bh); 469 } 470 471 out_m_bh: 472 brelse(m_bh); 473 out: 474 gfs2_glock_dq_uninit(&gh); 475 return 0; 476 } 477 478 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, 479 s64 dinodes) 480 { 481 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 482 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 483 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 484 struct buffer_head *l_bh; 485 s64 x, y; 486 int need_sync = 0; 487 int error; 488 489 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 490 if (error) 491 return; 492 493 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); 494 495 spin_lock(&sdp->sd_statfs_spin); 496 l_sc->sc_total += total; 497 l_sc->sc_free += free; 498 l_sc->sc_dinodes += dinodes; 499 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); 500 if (sdp->sd_args.ar_statfs_percent) { 501 x = 100 * l_sc->sc_free; 502 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent; 503 if (x >= y || x <= -y) 504 need_sync = 1; 505 } 506 spin_unlock(&sdp->sd_statfs_spin); 507 508 brelse(l_bh); 509 if (need_sync) 510 gfs2_wake_up_statfs(sdp); 511 } 512 513 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh, 514 struct buffer_head *l_bh) 515 { 516 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 517 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 518 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 519 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 520 521 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); 522 523 spin_lock(&sdp->sd_statfs_spin); 524 m_sc->sc_total += l_sc->sc_total; 525 m_sc->sc_free += l_sc->sc_free; 526 m_sc->sc_dinodes += l_sc->sc_dinodes; 527 memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); 528 memset(l_bh->b_data + sizeof(struct gfs2_dinode), 529 0, sizeof(struct gfs2_statfs_change)); 530 spin_unlock(&sdp->sd_statfs_spin); 531 532 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); 533 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); 534 } 535 536 int gfs2_statfs_sync(struct super_block *sb, int type) 537 { 538 struct gfs2_sbd *sdp = sb->s_fs_info; 539 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 540 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 541 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 542 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 543 struct gfs2_holder gh; 544 struct buffer_head *m_bh, *l_bh; 545 int error; 546 547 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 548 &gh); 549 if (error) 550 return error; 551 552 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 553 if (error) 554 goto out; 555 556 spin_lock(&sdp->sd_statfs_spin); 557 gfs2_statfs_change_in(m_sc, m_bh->b_data + 558 sizeof(struct gfs2_dinode)); 559 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { 560 spin_unlock(&sdp->sd_statfs_spin); 561 goto out_bh; 562 } 563 spin_unlock(&sdp->sd_statfs_spin); 564 565 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 566 if (error) 567 goto out_bh; 568 569 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 570 if (error) 571 goto out_bh2; 572 573 update_statfs(sdp, m_bh, l_bh); 574 sdp->sd_statfs_force_sync = 0; 575 576 gfs2_trans_end(sdp); 577 578 out_bh2: 579 brelse(l_bh); 580 out_bh: 581 brelse(m_bh); 582 out: 583 gfs2_glock_dq_uninit(&gh); 584 return error; 585 } 586 587 struct lfcc { 588 struct list_head list; 589 struct gfs2_holder gh; 590 }; 591 592 /** 593 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all 594 * journals are clean 595 * @sdp: the file system 596 * @state: the state to put the transaction lock into 597 * @t_gh: the hold on the transaction lock 598 * 599 * Returns: errno 600 */ 601 602 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, 603 struct gfs2_holder *t_gh) 604 { 605 struct gfs2_inode *ip; 606 struct gfs2_jdesc *jd; 607 struct lfcc *lfcc; 608 LIST_HEAD(list); 609 struct gfs2_log_header_host lh; 610 int error; 611 612 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 613 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); 614 if (!lfcc) { 615 error = -ENOMEM; 616 goto out; 617 } 618 ip = GFS2_I(jd->jd_inode); 619 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); 620 if (error) { 621 kfree(lfcc); 622 goto out; 623 } 624 list_add(&lfcc->list, &list); 625 } 626 627 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED, 628 GL_NOCACHE, t_gh); 629 630 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 631 error = gfs2_jdesc_check(jd); 632 if (error) 633 break; 634 error = gfs2_find_jhead(jd, &lh); 635 if (error) 636 break; 637 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 638 error = -EBUSY; 639 break; 640 } 641 } 642 643 if (error) 644 gfs2_glock_dq_uninit(t_gh); 645 646 out: 647 while (!list_empty(&list)) { 648 lfcc = list_entry(list.next, struct lfcc, list); 649 list_del(&lfcc->list); 650 gfs2_glock_dq_uninit(&lfcc->gh); 651 kfree(lfcc); 652 } 653 return error; 654 } 655 656 /** 657 * gfs2_freeze_fs - freezes the file system 658 * @sdp: the file system 659 * 660 * This function flushes data and meta data for all machines by 661 * acquiring the transaction log exclusively. All journals are 662 * ensured to be in a clean state as well. 663 * 664 * Returns: errno 665 */ 666 667 int gfs2_freeze_fs(struct gfs2_sbd *sdp) 668 { 669 int error = 0; 670 671 mutex_lock(&sdp->sd_freeze_lock); 672 673 if (!sdp->sd_freeze_count++) { 674 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); 675 if (error) 676 sdp->sd_freeze_count--; 677 } 678 679 mutex_unlock(&sdp->sd_freeze_lock); 680 681 return error; 682 } 683 684 /** 685 * gfs2_unfreeze_fs - unfreezes the file system 686 * @sdp: the file system 687 * 688 * This function allows the file system to proceed by unlocking 689 * the exclusively held transaction lock. Other GFS2 nodes are 690 * now free to acquire the lock shared and go on with their lives. 691 * 692 */ 693 694 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp) 695 { 696 mutex_lock(&sdp->sd_freeze_lock); 697 698 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count) 699 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 700 701 mutex_unlock(&sdp->sd_freeze_lock); 702 } 703 704 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 705 { 706 struct gfs2_dinode *str = buf; 707 708 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 709 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); 710 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); 711 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); 712 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); 713 str->di_mode = cpu_to_be32(ip->i_inode.i_mode); 714 str->di_uid = cpu_to_be32(ip->i_inode.i_uid); 715 str->di_gid = cpu_to_be32(ip->i_inode.i_gid); 716 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); 717 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode)); 718 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); 719 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 720 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); 721 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); 722 723 str->di_goal_meta = cpu_to_be64(ip->i_goal); 724 str->di_goal_data = cpu_to_be64(ip->i_goal); 725 str->di_generation = cpu_to_be64(ip->i_generation); 726 727 str->di_flags = cpu_to_be32(ip->i_diskflags); 728 str->di_height = cpu_to_be16(ip->i_height); 729 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && 730 !(ip->i_diskflags & GFS2_DIF_EXHASH) ? 731 GFS2_FORMAT_DE : 0); 732 str->di_depth = cpu_to_be16(ip->i_depth); 733 str->di_entries = cpu_to_be32(ip->i_entries); 734 735 str->di_eattr = cpu_to_be64(ip->i_eattr); 736 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); 737 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); 738 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); 739 } 740 741 /** 742 * gfs2_write_inode - Make sure the inode is stable on the disk 743 * @inode: The inode 744 * @wbc: The writeback control structure 745 * 746 * Returns: errno 747 */ 748 749 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) 750 { 751 struct gfs2_inode *ip = GFS2_I(inode); 752 struct gfs2_sbd *sdp = GFS2_SB(inode); 753 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 754 struct backing_dev_info *bdi = metamapping->backing_dev_info; 755 struct gfs2_holder gh; 756 struct buffer_head *bh; 757 struct timespec atime; 758 struct gfs2_dinode *di; 759 int ret = -EAGAIN; 760 int unlock_required = 0; 761 762 /* Skip timestamp update, if this is from a memalloc */ 763 if (current->flags & PF_MEMALLOC) 764 goto do_flush; 765 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { 766 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 767 if (ret) 768 goto do_flush; 769 unlock_required = 1; 770 } 771 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 772 if (ret) 773 goto do_unlock; 774 ret = gfs2_meta_inode_buffer(ip, &bh); 775 if (ret == 0) { 776 di = (struct gfs2_dinode *)bh->b_data; 777 atime.tv_sec = be64_to_cpu(di->di_atime); 778 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec); 779 if (timespec_compare(&inode->i_atime, &atime) > 0) { 780 gfs2_trans_add_bh(ip->i_gl, bh, 1); 781 gfs2_dinode_out(ip, bh->b_data); 782 } 783 brelse(bh); 784 } 785 gfs2_trans_end(sdp); 786 do_unlock: 787 if (unlock_required) 788 gfs2_glock_dq_uninit(&gh); 789 do_flush: 790 if (wbc->sync_mode == WB_SYNC_ALL) 791 gfs2_log_flush(GFS2_SB(inode), ip->i_gl); 792 filemap_fdatawrite(metamapping); 793 if (bdi->dirty_exceeded) 794 gfs2_ail1_flush(sdp, wbc); 795 if (!ret && (wbc->sync_mode == WB_SYNC_ALL)) 796 ret = filemap_fdatawait(metamapping); 797 if (ret) 798 mark_inode_dirty_sync(inode); 799 return ret; 800 } 801 802 /** 803 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 804 * @sdp: the filesystem 805 * 806 * Returns: errno 807 */ 808 809 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp) 810 { 811 struct gfs2_holder t_gh; 812 int error; 813 814 flush_workqueue(gfs2_delete_workqueue); 815 gfs2_quota_sync(sdp->sd_vfs, 0, 1); 816 gfs2_statfs_sync(sdp->sd_vfs, 0); 817 818 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE, 819 &t_gh); 820 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 821 return error; 822 823 gfs2_meta_syncfs(sdp); 824 gfs2_log_shutdown(sdp); 825 826 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 827 828 if (t_gh.gh_gl) 829 gfs2_glock_dq_uninit(&t_gh); 830 831 gfs2_quota_cleanup(sdp); 832 833 return error; 834 } 835 836 static int gfs2_umount_recovery_wait(void *word) 837 { 838 schedule(); 839 return 0; 840 } 841 842 /** 843 * gfs2_put_super - Unmount the filesystem 844 * @sb: The VFS superblock 845 * 846 */ 847 848 static void gfs2_put_super(struct super_block *sb) 849 { 850 struct gfs2_sbd *sdp = sb->s_fs_info; 851 int error; 852 struct gfs2_jdesc *jd; 853 854 /* Unfreeze the filesystem, if we need to */ 855 856 mutex_lock(&sdp->sd_freeze_lock); 857 if (sdp->sd_freeze_count) 858 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 859 mutex_unlock(&sdp->sd_freeze_lock); 860 861 /* No more recovery requests */ 862 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 863 smp_mb(); 864 865 /* Wait on outstanding recovery */ 866 restart: 867 spin_lock(&sdp->sd_jindex_spin); 868 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 869 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 870 continue; 871 spin_unlock(&sdp->sd_jindex_spin); 872 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 873 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE); 874 goto restart; 875 } 876 spin_unlock(&sdp->sd_jindex_spin); 877 878 kthread_stop(sdp->sd_quotad_process); 879 kthread_stop(sdp->sd_logd_process); 880 881 if (!(sb->s_flags & MS_RDONLY)) { 882 error = gfs2_make_fs_ro(sdp); 883 if (error) 884 gfs2_io_error(sdp); 885 } 886 /* At this point, we're through modifying the disk */ 887 888 /* Release stuff */ 889 890 iput(sdp->sd_jindex); 891 iput(sdp->sd_statfs_inode); 892 iput(sdp->sd_rindex); 893 iput(sdp->sd_quota_inode); 894 895 gfs2_glock_put(sdp->sd_rename_gl); 896 gfs2_glock_put(sdp->sd_trans_gl); 897 898 if (!sdp->sd_args.ar_spectator) { 899 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 900 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 901 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 902 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 903 iput(sdp->sd_sc_inode); 904 iput(sdp->sd_qc_inode); 905 } 906 907 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 908 gfs2_clear_rgrpd(sdp); 909 gfs2_jindex_free(sdp); 910 /* Take apart glock structures and buffer lists */ 911 gfs2_gl_hash_clear(sdp); 912 /* Unmount the locking protocol */ 913 gfs2_lm_unmount(sdp); 914 915 /* At this point, we're through participating in the lockspace */ 916 gfs2_sys_fs_del(sdp); 917 } 918 919 /** 920 * gfs2_sync_fs - sync the filesystem 921 * @sb: the superblock 922 * 923 * Flushes the log to disk. 924 */ 925 926 static int gfs2_sync_fs(struct super_block *sb, int wait) 927 { 928 struct gfs2_sbd *sdp = sb->s_fs_info; 929 if (wait && sdp) 930 gfs2_log_flush(sdp, NULL); 931 return 0; 932 } 933 934 /** 935 * gfs2_freeze - prevent further writes to the filesystem 936 * @sb: the VFS structure for the filesystem 937 * 938 */ 939 940 static int gfs2_freeze(struct super_block *sb) 941 { 942 struct gfs2_sbd *sdp = sb->s_fs_info; 943 int error; 944 945 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 946 return -EINVAL; 947 948 for (;;) { 949 error = gfs2_freeze_fs(sdp); 950 if (!error) 951 break; 952 953 switch (error) { 954 case -EBUSY: 955 fs_err(sdp, "waiting for recovery before freeze\n"); 956 break; 957 958 default: 959 fs_err(sdp, "error freezing FS: %d\n", error); 960 break; 961 } 962 963 fs_err(sdp, "retrying...\n"); 964 msleep(1000); 965 } 966 return 0; 967 } 968 969 /** 970 * gfs2_unfreeze - reallow writes to the filesystem 971 * @sb: the VFS structure for the filesystem 972 * 973 */ 974 975 static int gfs2_unfreeze(struct super_block *sb) 976 { 977 gfs2_unfreeze_fs(sb->s_fs_info); 978 return 0; 979 } 980 981 /** 982 * statfs_fill - fill in the sg for a given RG 983 * @rgd: the RG 984 * @sc: the sc structure 985 * 986 * Returns: 0 on success, -ESTALE if the LVB is invalid 987 */ 988 989 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 990 struct gfs2_statfs_change_host *sc) 991 { 992 gfs2_rgrp_verify(rgd); 993 sc->sc_total += rgd->rd_data; 994 sc->sc_free += rgd->rd_free; 995 sc->sc_dinodes += rgd->rd_dinodes; 996 return 0; 997 } 998 999 /** 1000 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 1001 * @sdp: the filesystem 1002 * @sc: the sc info that will be returned 1003 * 1004 * Any error (other than a signal) will cause this routine to fall back 1005 * to the synchronous version. 1006 * 1007 * FIXME: This really shouldn't busy wait like this. 1008 * 1009 * Returns: errno 1010 */ 1011 1012 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1013 { 1014 struct gfs2_holder ri_gh; 1015 struct gfs2_rgrpd *rgd_next; 1016 struct gfs2_holder *gha, *gh; 1017 unsigned int slots = 64; 1018 unsigned int x; 1019 int done; 1020 int error = 0, err; 1021 1022 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 1023 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 1024 if (!gha) 1025 return -ENOMEM; 1026 1027 error = gfs2_rindex_hold(sdp, &ri_gh); 1028 if (error) 1029 goto out; 1030 1031 rgd_next = gfs2_rgrpd_get_first(sdp); 1032 1033 for (;;) { 1034 done = 1; 1035 1036 for (x = 0; x < slots; x++) { 1037 gh = gha + x; 1038 1039 if (gh->gh_gl && gfs2_glock_poll(gh)) { 1040 err = gfs2_glock_wait(gh); 1041 if (err) { 1042 gfs2_holder_uninit(gh); 1043 error = err; 1044 } else { 1045 if (!error) 1046 error = statfs_slow_fill( 1047 gh->gh_gl->gl_object, sc); 1048 gfs2_glock_dq_uninit(gh); 1049 } 1050 } 1051 1052 if (gh->gh_gl) 1053 done = 0; 1054 else if (rgd_next && !error) { 1055 error = gfs2_glock_nq_init(rgd_next->rd_gl, 1056 LM_ST_SHARED, 1057 GL_ASYNC, 1058 gh); 1059 rgd_next = gfs2_rgrpd_get_next(rgd_next); 1060 done = 0; 1061 } 1062 1063 if (signal_pending(current)) 1064 error = -ERESTARTSYS; 1065 } 1066 1067 if (done) 1068 break; 1069 1070 yield(); 1071 } 1072 1073 gfs2_glock_dq_uninit(&ri_gh); 1074 1075 out: 1076 kfree(gha); 1077 return error; 1078 } 1079 1080 /** 1081 * gfs2_statfs_i - Do a statfs 1082 * @sdp: the filesystem 1083 * @sg: the sg structure 1084 * 1085 * Returns: errno 1086 */ 1087 1088 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1089 { 1090 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 1091 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 1092 1093 spin_lock(&sdp->sd_statfs_spin); 1094 1095 *sc = *m_sc; 1096 sc->sc_total += l_sc->sc_total; 1097 sc->sc_free += l_sc->sc_free; 1098 sc->sc_dinodes += l_sc->sc_dinodes; 1099 1100 spin_unlock(&sdp->sd_statfs_spin); 1101 1102 if (sc->sc_free < 0) 1103 sc->sc_free = 0; 1104 if (sc->sc_free > sc->sc_total) 1105 sc->sc_free = sc->sc_total; 1106 if (sc->sc_dinodes < 0) 1107 sc->sc_dinodes = 0; 1108 1109 return 0; 1110 } 1111 1112 /** 1113 * gfs2_statfs - Gather and return stats about the filesystem 1114 * @sb: The superblock 1115 * @statfsbuf: The buffer 1116 * 1117 * Returns: 0 on success or error code 1118 */ 1119 1120 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 1121 { 1122 struct super_block *sb = dentry->d_inode->i_sb; 1123 struct gfs2_sbd *sdp = sb->s_fs_info; 1124 struct gfs2_statfs_change_host sc; 1125 int error; 1126 1127 if (gfs2_tune_get(sdp, gt_statfs_slow)) 1128 error = gfs2_statfs_slow(sdp, &sc); 1129 else 1130 error = gfs2_statfs_i(sdp, &sc); 1131 1132 if (error) 1133 return error; 1134 1135 buf->f_type = GFS2_MAGIC; 1136 buf->f_bsize = sdp->sd_sb.sb_bsize; 1137 buf->f_blocks = sc.sc_total; 1138 buf->f_bfree = sc.sc_free; 1139 buf->f_bavail = sc.sc_free; 1140 buf->f_files = sc.sc_dinodes + sc.sc_free; 1141 buf->f_ffree = sc.sc_free; 1142 buf->f_namelen = GFS2_FNAMESIZE; 1143 1144 return 0; 1145 } 1146 1147 /** 1148 * gfs2_remount_fs - called when the FS is remounted 1149 * @sb: the filesystem 1150 * @flags: the remount flags 1151 * @data: extra data passed in (not used right now) 1152 * 1153 * Returns: errno 1154 */ 1155 1156 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) 1157 { 1158 struct gfs2_sbd *sdp = sb->s_fs_info; 1159 struct gfs2_args args = sdp->sd_args; /* Default to current settings */ 1160 struct gfs2_tune *gt = &sdp->sd_tune; 1161 int error; 1162 1163 spin_lock(>->gt_spin); 1164 args.ar_commit = gt->gt_logd_secs; 1165 args.ar_quota_quantum = gt->gt_quota_quantum; 1166 if (gt->gt_statfs_slow) 1167 args.ar_statfs_quantum = 0; 1168 else 1169 args.ar_statfs_quantum = gt->gt_statfs_quantum; 1170 spin_unlock(>->gt_spin); 1171 error = gfs2_mount_args(&args, data); 1172 if (error) 1173 return error; 1174 1175 /* Not allowed to change locking details */ 1176 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) || 1177 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) || 1178 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata)) 1179 return -EINVAL; 1180 1181 /* Some flags must not be changed */ 1182 if (args_neq(&args, &sdp->sd_args, spectator) || 1183 args_neq(&args, &sdp->sd_args, localflocks) || 1184 args_neq(&args, &sdp->sd_args, meta)) 1185 return -EINVAL; 1186 1187 if (sdp->sd_args.ar_spectator) 1188 *flags |= MS_RDONLY; 1189 1190 if ((sb->s_flags ^ *flags) & MS_RDONLY) { 1191 if (*flags & MS_RDONLY) 1192 error = gfs2_make_fs_ro(sdp); 1193 else 1194 error = gfs2_make_fs_rw(sdp); 1195 if (error) 1196 return error; 1197 } 1198 1199 sdp->sd_args = args; 1200 if (sdp->sd_args.ar_posix_acl) 1201 sb->s_flags |= MS_POSIXACL; 1202 else 1203 sb->s_flags &= ~MS_POSIXACL; 1204 if (sdp->sd_args.ar_nobarrier) 1205 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1206 else 1207 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1208 spin_lock(>->gt_spin); 1209 gt->gt_logd_secs = args.ar_commit; 1210 gt->gt_quota_quantum = args.ar_quota_quantum; 1211 if (args.ar_statfs_quantum) { 1212 gt->gt_statfs_slow = 0; 1213 gt->gt_statfs_quantum = args.ar_statfs_quantum; 1214 } 1215 else { 1216 gt->gt_statfs_slow = 1; 1217 gt->gt_statfs_quantum = 30; 1218 } 1219 spin_unlock(>->gt_spin); 1220 1221 gfs2_online_uevent(sdp); 1222 return 0; 1223 } 1224 1225 /** 1226 * gfs2_drop_inode - Drop an inode (test for remote unlink) 1227 * @inode: The inode to drop 1228 * 1229 * If we've received a callback on an iopen lock then its because a 1230 * remote node tried to deallocate the inode but failed due to this node 1231 * still having the inode open. Here we mark the link count zero 1232 * since we know that it must have reached zero if the GLF_DEMOTE flag 1233 * is set on the iopen glock. If we didn't do a disk read since the 1234 * remote node removed the final link then we might otherwise miss 1235 * this event. This check ensures that this node will deallocate the 1236 * inode's blocks, or alternatively pass the baton on to another 1237 * node for later deallocation. 1238 */ 1239 1240 static int gfs2_drop_inode(struct inode *inode) 1241 { 1242 struct gfs2_inode *ip = GFS2_I(inode); 1243 1244 if (inode->i_nlink) { 1245 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1246 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags)) 1247 clear_nlink(inode); 1248 } 1249 return generic_drop_inode(inode); 1250 } 1251 1252 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 1253 { 1254 do { 1255 if (d1 == d2) 1256 return 1; 1257 d1 = d1->d_parent; 1258 } while (!IS_ROOT(d1)); 1259 return 0; 1260 } 1261 1262 /** 1263 * gfs2_show_options - Show mount options for /proc/mounts 1264 * @s: seq_file structure 1265 * @mnt: vfsmount 1266 * 1267 * Returns: 0 on success or error code 1268 */ 1269 1270 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt) 1271 { 1272 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info; 1273 struct gfs2_args *args = &sdp->sd_args; 1274 int val; 1275 1276 if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir)) 1277 seq_printf(s, ",meta"); 1278 if (args->ar_lockproto[0]) 1279 seq_printf(s, ",lockproto=%s", args->ar_lockproto); 1280 if (args->ar_locktable[0]) 1281 seq_printf(s, ",locktable=%s", args->ar_locktable); 1282 if (args->ar_hostdata[0]) 1283 seq_printf(s, ",hostdata=%s", args->ar_hostdata); 1284 if (args->ar_spectator) 1285 seq_printf(s, ",spectator"); 1286 if (args->ar_localflocks) 1287 seq_printf(s, ",localflocks"); 1288 if (args->ar_debug) 1289 seq_printf(s, ",debug"); 1290 if (args->ar_posix_acl) 1291 seq_printf(s, ",acl"); 1292 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 1293 char *state; 1294 switch (args->ar_quota) { 1295 case GFS2_QUOTA_OFF: 1296 state = "off"; 1297 break; 1298 case GFS2_QUOTA_ACCOUNT: 1299 state = "account"; 1300 break; 1301 case GFS2_QUOTA_ON: 1302 state = "on"; 1303 break; 1304 default: 1305 state = "unknown"; 1306 break; 1307 } 1308 seq_printf(s, ",quota=%s", state); 1309 } 1310 if (args->ar_suiddir) 1311 seq_printf(s, ",suiddir"); 1312 if (args->ar_data != GFS2_DATA_DEFAULT) { 1313 char *state; 1314 switch (args->ar_data) { 1315 case GFS2_DATA_WRITEBACK: 1316 state = "writeback"; 1317 break; 1318 case GFS2_DATA_ORDERED: 1319 state = "ordered"; 1320 break; 1321 default: 1322 state = "unknown"; 1323 break; 1324 } 1325 seq_printf(s, ",data=%s", state); 1326 } 1327 if (args->ar_discard) 1328 seq_printf(s, ",discard"); 1329 val = sdp->sd_tune.gt_logd_secs; 1330 if (val != 30) 1331 seq_printf(s, ",commit=%d", val); 1332 val = sdp->sd_tune.gt_statfs_quantum; 1333 if (val != 30) 1334 seq_printf(s, ",statfs_quantum=%d", val); 1335 val = sdp->sd_tune.gt_quota_quantum; 1336 if (val != 60) 1337 seq_printf(s, ",quota_quantum=%d", val); 1338 if (args->ar_statfs_percent) 1339 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1340 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1341 const char *state; 1342 1343 switch (args->ar_errors) { 1344 case GFS2_ERRORS_WITHDRAW: 1345 state = "withdraw"; 1346 break; 1347 case GFS2_ERRORS_PANIC: 1348 state = "panic"; 1349 break; 1350 default: 1351 state = "unknown"; 1352 break; 1353 } 1354 seq_printf(s, ",errors=%s", state); 1355 } 1356 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1357 seq_printf(s, ",nobarrier"); 1358 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1359 seq_printf(s, ",demote_interface_used"); 1360 return 0; 1361 } 1362 1363 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1364 { 1365 struct inode *inode = &ip->i_inode; 1366 struct gfs2_glock *gl = ip->i_gl; 1367 1368 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1369 truncate_inode_pages(&inode->i_data, 0); 1370 1371 if (atomic_read(&gl->gl_revokes) == 0) { 1372 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1373 clear_bit(GLF_DIRTY, &gl->gl_flags); 1374 } 1375 } 1376 1377 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1378 { 1379 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1380 struct gfs2_alloc *al; 1381 struct gfs2_rgrpd *rgd; 1382 int error; 1383 1384 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1385 gfs2_consist_inode(ip); 1386 return -EIO; 1387 } 1388 1389 al = gfs2_alloc_get(ip); 1390 if (!al) 1391 return -ENOMEM; 1392 1393 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 1394 if (error) 1395 goto out; 1396 1397 error = gfs2_rindex_hold(sdp, &al->al_ri_gh); 1398 if (error) 1399 goto out_qs; 1400 1401 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); 1402 if (!rgd) { 1403 gfs2_consist_inode(ip); 1404 error = -EIO; 1405 goto out_rindex_relse; 1406 } 1407 1408 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, 1409 &al->al_rgd_gh); 1410 if (error) 1411 goto out_rindex_relse; 1412 1413 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1414 sdp->sd_jdesc->jd_blocks); 1415 if (error) 1416 goto out_rg_gunlock; 1417 1418 gfs2_free_di(rgd, ip); 1419 1420 gfs2_final_release_pages(ip); 1421 1422 gfs2_trans_end(sdp); 1423 1424 out_rg_gunlock: 1425 gfs2_glock_dq_uninit(&al->al_rgd_gh); 1426 out_rindex_relse: 1427 gfs2_glock_dq_uninit(&al->al_ri_gh); 1428 out_qs: 1429 gfs2_quota_unhold(ip); 1430 out: 1431 gfs2_alloc_put(ip); 1432 return error; 1433 } 1434 1435 /** 1436 * gfs2_evict_inode - Remove an inode from cache 1437 * @inode: The inode to evict 1438 * 1439 * There are three cases to consider: 1440 * 1. i_nlink == 0, we are final opener (and must deallocate) 1441 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1442 * 3. i_nlink > 0 1443 * 1444 * If the fs is read only, then we have to treat all cases as per #3 1445 * since we are unable to do any deallocation. The inode will be 1446 * deallocated by the next read/write node to attempt an allocation 1447 * in the same resource group 1448 * 1449 * We have to (at the moment) hold the inodes main lock to cover 1450 * the gap between unlocking the shared lock on the iopen lock and 1451 * taking the exclusive lock. I'd rather do a shared -> exclusive 1452 * conversion on the iopen lock, but we can change that later. This 1453 * is safe, just less efficient. 1454 */ 1455 1456 static void gfs2_evict_inode(struct inode *inode) 1457 { 1458 struct super_block *sb = inode->i_sb; 1459 struct gfs2_sbd *sdp = sb->s_fs_info; 1460 struct gfs2_inode *ip = GFS2_I(inode); 1461 struct gfs2_holder gh; 1462 int error; 1463 1464 if (inode->i_nlink || (sb->s_flags & MS_RDONLY)) 1465 goto out; 1466 1467 /* Must not read inode block until block type has been verified */ 1468 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 1469 if (unlikely(error)) { 1470 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1471 goto out; 1472 } 1473 1474 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1475 if (error) 1476 goto out_truncate; 1477 1478 if (test_bit(GIF_INVALID, &ip->i_flags)) { 1479 error = gfs2_inode_refresh(ip); 1480 if (error) 1481 goto out_truncate; 1482 } 1483 1484 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1485 gfs2_glock_dq_wait(&ip->i_iopen_gh); 1486 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh); 1487 error = gfs2_glock_nq(&ip->i_iopen_gh); 1488 if (error) 1489 goto out_truncate; 1490 1491 /* Case 1 starts here */ 1492 1493 if (S_ISDIR(inode->i_mode) && 1494 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1495 error = gfs2_dir_exhash_dealloc(ip); 1496 if (error) 1497 goto out_unlock; 1498 } 1499 1500 if (ip->i_eattr) { 1501 error = gfs2_ea_dealloc(ip); 1502 if (error) 1503 goto out_unlock; 1504 } 1505 1506 if (!gfs2_is_stuffed(ip)) { 1507 error = gfs2_file_dealloc(ip); 1508 if (error) 1509 goto out_unlock; 1510 } 1511 1512 error = gfs2_dinode_dealloc(ip); 1513 goto out_unlock; 1514 1515 out_truncate: 1516 /* Case 2 starts here */ 1517 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1518 if (error) 1519 goto out_unlock; 1520 /* Needs to be done before glock release & also in a transaction */ 1521 truncate_inode_pages(&inode->i_data, 0); 1522 gfs2_trans_end(sdp); 1523 1524 out_unlock: 1525 /* Error path for case 1 */ 1526 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) 1527 gfs2_glock_dq(&ip->i_iopen_gh); 1528 gfs2_holder_uninit(&ip->i_iopen_gh); 1529 gfs2_glock_dq_uninit(&gh); 1530 if (error && error != GLR_TRYFAILED && error != -EROFS) 1531 fs_warn(sdp, "gfs2_evict_inode: %d\n", error); 1532 out: 1533 /* Case 3 starts here */ 1534 truncate_inode_pages(&inode->i_data, 0); 1535 end_writeback(inode); 1536 gfs2_dir_hash_inval(ip); 1537 ip->i_gl->gl_object = NULL; 1538 gfs2_glock_add_to_lru(ip->i_gl); 1539 gfs2_glock_put(ip->i_gl); 1540 ip->i_gl = NULL; 1541 if (ip->i_iopen_gh.gh_gl) { 1542 ip->i_iopen_gh.gh_gl->gl_object = NULL; 1543 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1544 } 1545 } 1546 1547 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1548 { 1549 struct gfs2_inode *ip; 1550 1551 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1552 if (ip) { 1553 ip->i_flags = 0; 1554 ip->i_gl = NULL; 1555 } 1556 return &ip->i_inode; 1557 } 1558 1559 static void gfs2_i_callback(struct rcu_head *head) 1560 { 1561 struct inode *inode = container_of(head, struct inode, i_rcu); 1562 INIT_LIST_HEAD(&inode->i_dentry); 1563 kmem_cache_free(gfs2_inode_cachep, inode); 1564 } 1565 1566 static void gfs2_destroy_inode(struct inode *inode) 1567 { 1568 call_rcu(&inode->i_rcu, gfs2_i_callback); 1569 } 1570 1571 const struct super_operations gfs2_super_ops = { 1572 .alloc_inode = gfs2_alloc_inode, 1573 .destroy_inode = gfs2_destroy_inode, 1574 .write_inode = gfs2_write_inode, 1575 .evict_inode = gfs2_evict_inode, 1576 .put_super = gfs2_put_super, 1577 .sync_fs = gfs2_sync_fs, 1578 .freeze_fs = gfs2_freeze, 1579 .unfreeze_fs = gfs2_unfreeze, 1580 .statfs = gfs2_statfs, 1581 .remount_fs = gfs2_remount_fs, 1582 .drop_inode = gfs2_drop_inode, 1583 .show_options = gfs2_show_options, 1584 }; 1585 1586