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_rgrplvb, 82 Opt_norgrplvb, 83 Opt_error, 84 }; 85 86 static const match_table_t tokens = { 87 {Opt_lockproto, "lockproto=%s"}, 88 {Opt_locktable, "locktable=%s"}, 89 {Opt_hostdata, "hostdata=%s"}, 90 {Opt_spectator, "spectator"}, 91 {Opt_spectator, "norecovery"}, 92 {Opt_ignore_local_fs, "ignore_local_fs"}, 93 {Opt_localflocks, "localflocks"}, 94 {Opt_localcaching, "localcaching"}, 95 {Opt_debug, "debug"}, 96 {Opt_nodebug, "nodebug"}, 97 {Opt_upgrade, "upgrade"}, 98 {Opt_acl, "acl"}, 99 {Opt_noacl, "noacl"}, 100 {Opt_quota_off, "quota=off"}, 101 {Opt_quota_account, "quota=account"}, 102 {Opt_quota_on, "quota=on"}, 103 {Opt_quota, "quota"}, 104 {Opt_noquota, "noquota"}, 105 {Opt_suiddir, "suiddir"}, 106 {Opt_nosuiddir, "nosuiddir"}, 107 {Opt_data_writeback, "data=writeback"}, 108 {Opt_data_ordered, "data=ordered"}, 109 {Opt_meta, "meta"}, 110 {Opt_discard, "discard"}, 111 {Opt_nodiscard, "nodiscard"}, 112 {Opt_commit, "commit=%d"}, 113 {Opt_err_withdraw, "errors=withdraw"}, 114 {Opt_err_panic, "errors=panic"}, 115 {Opt_statfs_quantum, "statfs_quantum=%d"}, 116 {Opt_statfs_percent, "statfs_percent=%d"}, 117 {Opt_quota_quantum, "quota_quantum=%d"}, 118 {Opt_barrier, "barrier"}, 119 {Opt_nobarrier, "nobarrier"}, 120 {Opt_rgrplvb, "rgrplvb"}, 121 {Opt_norgrplvb, "norgrplvb"}, 122 {Opt_error, NULL} 123 }; 124 125 /** 126 * gfs2_mount_args - Parse mount options 127 * @args: The structure into which the parsed options will be written 128 * @options: The options to parse 129 * 130 * Return: errno 131 */ 132 133 int gfs2_mount_args(struct gfs2_args *args, char *options) 134 { 135 char *o; 136 int token; 137 substring_t tmp[MAX_OPT_ARGS]; 138 int rv; 139 140 /* Split the options into tokens with the "," character and 141 process them */ 142 143 while (1) { 144 o = strsep(&options, ","); 145 if (o == NULL) 146 break; 147 if (*o == '\0') 148 continue; 149 150 token = match_token(o, tokens, tmp); 151 switch (token) { 152 case Opt_lockproto: 153 match_strlcpy(args->ar_lockproto, &tmp[0], 154 GFS2_LOCKNAME_LEN); 155 break; 156 case Opt_locktable: 157 match_strlcpy(args->ar_locktable, &tmp[0], 158 GFS2_LOCKNAME_LEN); 159 break; 160 case Opt_hostdata: 161 match_strlcpy(args->ar_hostdata, &tmp[0], 162 GFS2_LOCKNAME_LEN); 163 break; 164 case Opt_spectator: 165 args->ar_spectator = 1; 166 break; 167 case Opt_ignore_local_fs: 168 /* Retained for backwards compat only */ 169 break; 170 case Opt_localflocks: 171 args->ar_localflocks = 1; 172 break; 173 case Opt_localcaching: 174 /* Retained for backwards compat only */ 175 break; 176 case Opt_debug: 177 if (args->ar_errors == GFS2_ERRORS_PANIC) { 178 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic " 179 "are mutually exclusive.\n"); 180 return -EINVAL; 181 } 182 args->ar_debug = 1; 183 break; 184 case Opt_nodebug: 185 args->ar_debug = 0; 186 break; 187 case Opt_upgrade: 188 /* Retained for backwards compat only */ 189 break; 190 case Opt_acl: 191 args->ar_posix_acl = 1; 192 break; 193 case Opt_noacl: 194 args->ar_posix_acl = 0; 195 break; 196 case Opt_quota_off: 197 case Opt_noquota: 198 args->ar_quota = GFS2_QUOTA_OFF; 199 break; 200 case Opt_quota_account: 201 args->ar_quota = GFS2_QUOTA_ACCOUNT; 202 break; 203 case Opt_quota_on: 204 case Opt_quota: 205 args->ar_quota = GFS2_QUOTA_ON; 206 break; 207 case Opt_suiddir: 208 args->ar_suiddir = 1; 209 break; 210 case Opt_nosuiddir: 211 args->ar_suiddir = 0; 212 break; 213 case Opt_data_writeback: 214 args->ar_data = GFS2_DATA_WRITEBACK; 215 break; 216 case Opt_data_ordered: 217 args->ar_data = GFS2_DATA_ORDERED; 218 break; 219 case Opt_meta: 220 args->ar_meta = 1; 221 break; 222 case Opt_discard: 223 args->ar_discard = 1; 224 break; 225 case Opt_nodiscard: 226 args->ar_discard = 0; 227 break; 228 case Opt_commit: 229 rv = match_int(&tmp[0], &args->ar_commit); 230 if (rv || args->ar_commit <= 0) { 231 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n"); 232 return rv ? rv : -EINVAL; 233 } 234 break; 235 case Opt_statfs_quantum: 236 rv = match_int(&tmp[0], &args->ar_statfs_quantum); 237 if (rv || args->ar_statfs_quantum < 0) { 238 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n"); 239 return rv ? rv : -EINVAL; 240 } 241 break; 242 case Opt_quota_quantum: 243 rv = match_int(&tmp[0], &args->ar_quota_quantum); 244 if (rv || args->ar_quota_quantum <= 0) { 245 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n"); 246 return rv ? rv : -EINVAL; 247 } 248 break; 249 case Opt_statfs_percent: 250 rv = match_int(&tmp[0], &args->ar_statfs_percent); 251 if (rv || args->ar_statfs_percent < 0 || 252 args->ar_statfs_percent > 100) { 253 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n"); 254 return rv ? rv : -EINVAL; 255 } 256 break; 257 case Opt_err_withdraw: 258 args->ar_errors = GFS2_ERRORS_WITHDRAW; 259 break; 260 case Opt_err_panic: 261 if (args->ar_debug) { 262 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic " 263 "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 printk(KERN_WARNING "GFS2: 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 */ 295 296 void gfs2_jindex_free(struct gfs2_sbd *sdp) 297 { 298 struct list_head list, *head; 299 struct gfs2_jdesc *jd; 300 struct gfs2_journal_extent *jext; 301 302 spin_lock(&sdp->sd_jindex_spin); 303 list_add(&list, &sdp->sd_jindex_list); 304 list_del_init(&sdp->sd_jindex_list); 305 sdp->sd_journals = 0; 306 spin_unlock(&sdp->sd_jindex_spin); 307 308 while (!list_empty(&list)) { 309 jd = list_entry(list.next, struct gfs2_jdesc, jd_list); 310 head = &jd->extent_list; 311 while (!list_empty(head)) { 312 jext = list_entry(head->next, 313 struct gfs2_journal_extent, 314 extent_list); 315 list_del(&jext->extent_list); 316 kfree(jext); 317 } 318 list_del(&jd->jd_list); 319 iput(jd->jd_inode); 320 kfree(jd); 321 } 322 } 323 324 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) 325 { 326 struct gfs2_jdesc *jd; 327 int found = 0; 328 329 list_for_each_entry(jd, head, jd_list) { 330 if (jd->jd_jid == jid) { 331 found = 1; 332 break; 333 } 334 } 335 336 if (!found) 337 jd = NULL; 338 339 return jd; 340 } 341 342 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) 343 { 344 struct gfs2_jdesc *jd; 345 346 spin_lock(&sdp->sd_jindex_spin); 347 jd = jdesc_find_i(&sdp->sd_jindex_list, jid); 348 spin_unlock(&sdp->sd_jindex_spin); 349 350 return jd; 351 } 352 353 int gfs2_jdesc_check(struct gfs2_jdesc *jd) 354 { 355 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 356 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 357 u64 size = i_size_read(jd->jd_inode); 358 359 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30)) 360 return -EIO; 361 362 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift; 363 364 if (gfs2_write_alloc_required(ip, 0, size)) { 365 gfs2_consist_inode(ip); 366 return -EIO; 367 } 368 369 return 0; 370 } 371 372 /** 373 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one 374 * @sdp: the filesystem 375 * 376 * Returns: errno 377 */ 378 379 int gfs2_make_fs_rw(struct gfs2_sbd *sdp) 380 { 381 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 382 struct gfs2_glock *j_gl = ip->i_gl; 383 struct gfs2_holder t_gh; 384 struct gfs2_log_header_host head; 385 int error; 386 387 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh); 388 if (error) 389 return error; 390 391 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 392 393 error = gfs2_find_jhead(sdp->sd_jdesc, &head); 394 if (error) 395 goto fail; 396 397 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 398 gfs2_consist(sdp); 399 error = -EIO; 400 goto fail; 401 } 402 403 /* Initialize some head of the log stuff */ 404 sdp->sd_log_sequence = head.lh_sequence + 1; 405 gfs2_log_pointers_init(sdp, head.lh_blkno); 406 407 error = gfs2_quota_init(sdp); 408 if (error) 409 goto fail; 410 411 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 412 413 gfs2_glock_dq_uninit(&t_gh); 414 415 return 0; 416 417 fail: 418 t_gh.gh_flags |= GL_NOCACHE; 419 gfs2_glock_dq_uninit(&t_gh); 420 421 return error; 422 } 423 424 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) 425 { 426 const struct gfs2_statfs_change *str = buf; 427 428 sc->sc_total = be64_to_cpu(str->sc_total); 429 sc->sc_free = be64_to_cpu(str->sc_free); 430 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); 431 } 432 433 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) 434 { 435 struct gfs2_statfs_change *str = buf; 436 437 str->sc_total = cpu_to_be64(sc->sc_total); 438 str->sc_free = cpu_to_be64(sc->sc_free); 439 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); 440 } 441 442 int gfs2_statfs_init(struct gfs2_sbd *sdp) 443 { 444 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 445 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 446 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 447 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 448 struct buffer_head *m_bh, *l_bh; 449 struct gfs2_holder gh; 450 int error; 451 452 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 453 &gh); 454 if (error) 455 return error; 456 457 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 458 if (error) 459 goto out; 460 461 if (sdp->sd_args.ar_spectator) { 462 spin_lock(&sdp->sd_statfs_spin); 463 gfs2_statfs_change_in(m_sc, m_bh->b_data + 464 sizeof(struct gfs2_dinode)); 465 spin_unlock(&sdp->sd_statfs_spin); 466 } else { 467 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 468 if (error) 469 goto out_m_bh; 470 471 spin_lock(&sdp->sd_statfs_spin); 472 gfs2_statfs_change_in(m_sc, m_bh->b_data + 473 sizeof(struct gfs2_dinode)); 474 gfs2_statfs_change_in(l_sc, l_bh->b_data + 475 sizeof(struct gfs2_dinode)); 476 spin_unlock(&sdp->sd_statfs_spin); 477 478 brelse(l_bh); 479 } 480 481 out_m_bh: 482 brelse(m_bh); 483 out: 484 gfs2_glock_dq_uninit(&gh); 485 return 0; 486 } 487 488 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, 489 s64 dinodes) 490 { 491 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 492 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 493 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 494 struct buffer_head *l_bh; 495 s64 x, y; 496 int need_sync = 0; 497 int error; 498 499 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 500 if (error) 501 return; 502 503 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); 504 505 spin_lock(&sdp->sd_statfs_spin); 506 l_sc->sc_total += total; 507 l_sc->sc_free += free; 508 l_sc->sc_dinodes += dinodes; 509 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); 510 if (sdp->sd_args.ar_statfs_percent) { 511 x = 100 * l_sc->sc_free; 512 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent; 513 if (x >= y || x <= -y) 514 need_sync = 1; 515 } 516 spin_unlock(&sdp->sd_statfs_spin); 517 518 brelse(l_bh); 519 if (need_sync) 520 gfs2_wake_up_statfs(sdp); 521 } 522 523 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh, 524 struct buffer_head *l_bh) 525 { 526 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 527 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 528 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 529 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 530 531 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); 532 533 spin_lock(&sdp->sd_statfs_spin); 534 m_sc->sc_total += l_sc->sc_total; 535 m_sc->sc_free += l_sc->sc_free; 536 m_sc->sc_dinodes += l_sc->sc_dinodes; 537 memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); 538 memset(l_bh->b_data + sizeof(struct gfs2_dinode), 539 0, sizeof(struct gfs2_statfs_change)); 540 spin_unlock(&sdp->sd_statfs_spin); 541 542 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); 543 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); 544 } 545 546 int gfs2_statfs_sync(struct super_block *sb, int type) 547 { 548 struct gfs2_sbd *sdp = sb->s_fs_info; 549 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 550 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 551 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 552 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 553 struct gfs2_holder gh; 554 struct buffer_head *m_bh, *l_bh; 555 int error; 556 557 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 558 &gh); 559 if (error) 560 return error; 561 562 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 563 if (error) 564 goto out; 565 566 spin_lock(&sdp->sd_statfs_spin); 567 gfs2_statfs_change_in(m_sc, m_bh->b_data + 568 sizeof(struct gfs2_dinode)); 569 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { 570 spin_unlock(&sdp->sd_statfs_spin); 571 goto out_bh; 572 } 573 spin_unlock(&sdp->sd_statfs_spin); 574 575 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 576 if (error) 577 goto out_bh; 578 579 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 580 if (error) 581 goto out_bh2; 582 583 update_statfs(sdp, m_bh, l_bh); 584 sdp->sd_statfs_force_sync = 0; 585 586 gfs2_trans_end(sdp); 587 588 out_bh2: 589 brelse(l_bh); 590 out_bh: 591 brelse(m_bh); 592 out: 593 gfs2_glock_dq_uninit(&gh); 594 return error; 595 } 596 597 struct lfcc { 598 struct list_head list; 599 struct gfs2_holder gh; 600 }; 601 602 /** 603 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all 604 * journals are clean 605 * @sdp: the file system 606 * @state: the state to put the transaction lock into 607 * @t_gh: the hold on the transaction lock 608 * 609 * Returns: errno 610 */ 611 612 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, 613 struct gfs2_holder *t_gh) 614 { 615 struct gfs2_inode *ip; 616 struct gfs2_jdesc *jd; 617 struct lfcc *lfcc; 618 LIST_HEAD(list); 619 struct gfs2_log_header_host lh; 620 int error; 621 622 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 623 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); 624 if (!lfcc) { 625 error = -ENOMEM; 626 goto out; 627 } 628 ip = GFS2_I(jd->jd_inode); 629 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); 630 if (error) { 631 kfree(lfcc); 632 goto out; 633 } 634 list_add(&lfcc->list, &list); 635 } 636 637 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED, 638 GL_NOCACHE, t_gh); 639 640 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 641 error = gfs2_jdesc_check(jd); 642 if (error) 643 break; 644 error = gfs2_find_jhead(jd, &lh); 645 if (error) 646 break; 647 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 648 error = -EBUSY; 649 break; 650 } 651 } 652 653 if (error) 654 gfs2_glock_dq_uninit(t_gh); 655 656 out: 657 while (!list_empty(&list)) { 658 lfcc = list_entry(list.next, struct lfcc, list); 659 list_del(&lfcc->list); 660 gfs2_glock_dq_uninit(&lfcc->gh); 661 kfree(lfcc); 662 } 663 return error; 664 } 665 666 /** 667 * gfs2_freeze_fs - freezes the file system 668 * @sdp: the file system 669 * 670 * This function flushes data and meta data for all machines by 671 * acquiring the transaction log exclusively. All journals are 672 * ensured to be in a clean state as well. 673 * 674 * Returns: errno 675 */ 676 677 int gfs2_freeze_fs(struct gfs2_sbd *sdp) 678 { 679 int error = 0; 680 681 mutex_lock(&sdp->sd_freeze_lock); 682 683 if (!sdp->sd_freeze_count++) { 684 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); 685 if (error) 686 sdp->sd_freeze_count--; 687 } 688 689 mutex_unlock(&sdp->sd_freeze_lock); 690 691 return error; 692 } 693 694 /** 695 * gfs2_unfreeze_fs - unfreezes the file system 696 * @sdp: the file system 697 * 698 * This function allows the file system to proceed by unlocking 699 * the exclusively held transaction lock. Other GFS2 nodes are 700 * now free to acquire the lock shared and go on with their lives. 701 * 702 */ 703 704 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp) 705 { 706 mutex_lock(&sdp->sd_freeze_lock); 707 708 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count) 709 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 710 711 mutex_unlock(&sdp->sd_freeze_lock); 712 } 713 714 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 715 { 716 struct gfs2_dinode *str = buf; 717 718 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 719 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); 720 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); 721 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); 722 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); 723 str->di_mode = cpu_to_be32(ip->i_inode.i_mode); 724 str->di_uid = cpu_to_be32(ip->i_inode.i_uid); 725 str->di_gid = cpu_to_be32(ip->i_inode.i_gid); 726 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); 727 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode)); 728 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); 729 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 730 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); 731 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); 732 733 str->di_goal_meta = cpu_to_be64(ip->i_goal); 734 str->di_goal_data = cpu_to_be64(ip->i_goal); 735 str->di_generation = cpu_to_be64(ip->i_generation); 736 737 str->di_flags = cpu_to_be32(ip->i_diskflags); 738 str->di_height = cpu_to_be16(ip->i_height); 739 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && 740 !(ip->i_diskflags & GFS2_DIF_EXHASH) ? 741 GFS2_FORMAT_DE : 0); 742 str->di_depth = cpu_to_be16(ip->i_depth); 743 str->di_entries = cpu_to_be32(ip->i_entries); 744 745 str->di_eattr = cpu_to_be64(ip->i_eattr); 746 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); 747 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); 748 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); 749 } 750 751 /** 752 * gfs2_write_inode - Make sure the inode is stable on the disk 753 * @inode: The inode 754 * @wbc: The writeback control structure 755 * 756 * Returns: errno 757 */ 758 759 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) 760 { 761 struct gfs2_inode *ip = GFS2_I(inode); 762 struct gfs2_sbd *sdp = GFS2_SB(inode); 763 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 764 struct backing_dev_info *bdi = metamapping->backing_dev_info; 765 int ret = 0; 766 767 if (wbc->sync_mode == WB_SYNC_ALL) 768 gfs2_log_flush(GFS2_SB(inode), ip->i_gl); 769 if (bdi->dirty_exceeded) 770 gfs2_ail1_flush(sdp, wbc); 771 else 772 filemap_fdatawrite(metamapping); 773 if (wbc->sync_mode == WB_SYNC_ALL) 774 ret = filemap_fdatawait(metamapping); 775 if (ret) 776 mark_inode_dirty_sync(inode); 777 return ret; 778 } 779 780 /** 781 * gfs2_dirty_inode - check for atime updates 782 * @inode: The inode in question 783 * @flags: The type of dirty 784 * 785 * Unfortunately it can be called under any combination of inode 786 * glock and transaction lock, so we have to check carefully. 787 * 788 * At the moment this deals only with atime - it should be possible 789 * to expand that role in future, once a review of the locking has 790 * been carried out. 791 */ 792 793 static void gfs2_dirty_inode(struct inode *inode, int flags) 794 { 795 struct gfs2_inode *ip = GFS2_I(inode); 796 struct gfs2_sbd *sdp = GFS2_SB(inode); 797 struct buffer_head *bh; 798 struct gfs2_holder gh; 799 int need_unlock = 0; 800 int need_endtrans = 0; 801 int ret; 802 803 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC))) 804 return; 805 806 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { 807 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 808 if (ret) { 809 fs_err(sdp, "dirty_inode: glock %d\n", ret); 810 return; 811 } 812 need_unlock = 1; 813 } 814 815 if (current->journal_info == NULL) { 816 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 817 if (ret) { 818 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); 819 goto out; 820 } 821 need_endtrans = 1; 822 } 823 824 ret = gfs2_meta_inode_buffer(ip, &bh); 825 if (ret == 0) { 826 gfs2_trans_add_bh(ip->i_gl, bh, 1); 827 gfs2_dinode_out(ip, bh->b_data); 828 brelse(bh); 829 } 830 831 if (need_endtrans) 832 gfs2_trans_end(sdp); 833 out: 834 if (need_unlock) 835 gfs2_glock_dq_uninit(&gh); 836 } 837 838 /** 839 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 840 * @sdp: the filesystem 841 * 842 * Returns: errno 843 */ 844 845 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp) 846 { 847 struct gfs2_holder t_gh; 848 int error; 849 850 flush_workqueue(gfs2_delete_workqueue); 851 gfs2_quota_sync(sdp->sd_vfs, 0); 852 gfs2_statfs_sync(sdp->sd_vfs, 0); 853 854 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE, 855 &t_gh); 856 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 857 return error; 858 859 gfs2_meta_syncfs(sdp); 860 gfs2_log_shutdown(sdp); 861 862 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 863 864 if (t_gh.gh_gl) 865 gfs2_glock_dq_uninit(&t_gh); 866 867 gfs2_quota_cleanup(sdp); 868 869 return error; 870 } 871 872 static int gfs2_umount_recovery_wait(void *word) 873 { 874 schedule(); 875 return 0; 876 } 877 878 /** 879 * gfs2_put_super - Unmount the filesystem 880 * @sb: The VFS superblock 881 * 882 */ 883 884 static void gfs2_put_super(struct super_block *sb) 885 { 886 struct gfs2_sbd *sdp = sb->s_fs_info; 887 int error; 888 struct gfs2_jdesc *jd; 889 890 /* Unfreeze the filesystem, if we need to */ 891 892 mutex_lock(&sdp->sd_freeze_lock); 893 if (sdp->sd_freeze_count) 894 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 895 mutex_unlock(&sdp->sd_freeze_lock); 896 897 /* No more recovery requests */ 898 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 899 smp_mb(); 900 901 /* Wait on outstanding recovery */ 902 restart: 903 spin_lock(&sdp->sd_jindex_spin); 904 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 905 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 906 continue; 907 spin_unlock(&sdp->sd_jindex_spin); 908 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 909 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE); 910 goto restart; 911 } 912 spin_unlock(&sdp->sd_jindex_spin); 913 914 kthread_stop(sdp->sd_quotad_process); 915 kthread_stop(sdp->sd_logd_process); 916 917 if (!(sb->s_flags & MS_RDONLY)) { 918 error = gfs2_make_fs_ro(sdp); 919 if (error) 920 gfs2_io_error(sdp); 921 } 922 /* At this point, we're through modifying the disk */ 923 924 /* Release stuff */ 925 926 iput(sdp->sd_jindex); 927 iput(sdp->sd_statfs_inode); 928 iput(sdp->sd_rindex); 929 iput(sdp->sd_quota_inode); 930 931 gfs2_glock_put(sdp->sd_rename_gl); 932 gfs2_glock_put(sdp->sd_trans_gl); 933 934 if (!sdp->sd_args.ar_spectator) { 935 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 936 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 937 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 938 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 939 iput(sdp->sd_sc_inode); 940 iput(sdp->sd_qc_inode); 941 } 942 943 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 944 gfs2_clear_rgrpd(sdp); 945 gfs2_jindex_free(sdp); 946 /* Take apart glock structures and buffer lists */ 947 gfs2_gl_hash_clear(sdp); 948 /* Unmount the locking protocol */ 949 gfs2_lm_unmount(sdp); 950 951 /* At this point, we're through participating in the lockspace */ 952 gfs2_sys_fs_del(sdp); 953 } 954 955 /** 956 * gfs2_sync_fs - sync the filesystem 957 * @sb: the superblock 958 * 959 * Flushes the log to disk. 960 */ 961 962 static int gfs2_sync_fs(struct super_block *sb, int wait) 963 { 964 struct gfs2_sbd *sdp = sb->s_fs_info; 965 966 gfs2_quota_sync(sb, -1); 967 if (wait && sdp) 968 gfs2_log_flush(sdp, NULL); 969 return 0; 970 } 971 972 /** 973 * gfs2_freeze - prevent further writes to the filesystem 974 * @sb: the VFS structure for the filesystem 975 * 976 */ 977 978 static int gfs2_freeze(struct super_block *sb) 979 { 980 struct gfs2_sbd *sdp = sb->s_fs_info; 981 int error; 982 983 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 984 return -EINVAL; 985 986 for (;;) { 987 error = gfs2_freeze_fs(sdp); 988 if (!error) 989 break; 990 991 switch (error) { 992 case -EBUSY: 993 fs_err(sdp, "waiting for recovery before freeze\n"); 994 break; 995 996 default: 997 fs_err(sdp, "error freezing FS: %d\n", error); 998 break; 999 } 1000 1001 fs_err(sdp, "retrying...\n"); 1002 msleep(1000); 1003 } 1004 return 0; 1005 } 1006 1007 /** 1008 * gfs2_unfreeze - reallow writes to the filesystem 1009 * @sb: the VFS structure for the filesystem 1010 * 1011 */ 1012 1013 static int gfs2_unfreeze(struct super_block *sb) 1014 { 1015 gfs2_unfreeze_fs(sb->s_fs_info); 1016 return 0; 1017 } 1018 1019 /** 1020 * statfs_fill - fill in the sg for a given RG 1021 * @rgd: the RG 1022 * @sc: the sc structure 1023 * 1024 * Returns: 0 on success, -ESTALE if the LVB is invalid 1025 */ 1026 1027 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 1028 struct gfs2_statfs_change_host *sc) 1029 { 1030 gfs2_rgrp_verify(rgd); 1031 sc->sc_total += rgd->rd_data; 1032 sc->sc_free += rgd->rd_free; 1033 sc->sc_dinodes += rgd->rd_dinodes; 1034 return 0; 1035 } 1036 1037 /** 1038 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 1039 * @sdp: the filesystem 1040 * @sc: the sc info that will be returned 1041 * 1042 * Any error (other than a signal) will cause this routine to fall back 1043 * to the synchronous version. 1044 * 1045 * FIXME: This really shouldn't busy wait like this. 1046 * 1047 * Returns: errno 1048 */ 1049 1050 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1051 { 1052 struct gfs2_rgrpd *rgd_next; 1053 struct gfs2_holder *gha, *gh; 1054 unsigned int slots = 64; 1055 unsigned int x; 1056 int done; 1057 int error = 0, err; 1058 1059 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 1060 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 1061 if (!gha) 1062 return -ENOMEM; 1063 1064 rgd_next = gfs2_rgrpd_get_first(sdp); 1065 1066 for (;;) { 1067 done = 1; 1068 1069 for (x = 0; x < slots; x++) { 1070 gh = gha + x; 1071 1072 if (gh->gh_gl && gfs2_glock_poll(gh)) { 1073 err = gfs2_glock_wait(gh); 1074 if (err) { 1075 gfs2_holder_uninit(gh); 1076 error = err; 1077 } else { 1078 if (!error) 1079 error = statfs_slow_fill( 1080 gh->gh_gl->gl_object, sc); 1081 gfs2_glock_dq_uninit(gh); 1082 } 1083 } 1084 1085 if (gh->gh_gl) 1086 done = 0; 1087 else if (rgd_next && !error) { 1088 error = gfs2_glock_nq_init(rgd_next->rd_gl, 1089 LM_ST_SHARED, 1090 GL_ASYNC, 1091 gh); 1092 rgd_next = gfs2_rgrpd_get_next(rgd_next); 1093 done = 0; 1094 } 1095 1096 if (signal_pending(current)) 1097 error = -ERESTARTSYS; 1098 } 1099 1100 if (done) 1101 break; 1102 1103 yield(); 1104 } 1105 1106 kfree(gha); 1107 return error; 1108 } 1109 1110 /** 1111 * gfs2_statfs_i - Do a statfs 1112 * @sdp: the filesystem 1113 * @sg: the sg structure 1114 * 1115 * Returns: errno 1116 */ 1117 1118 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1119 { 1120 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 1121 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 1122 1123 spin_lock(&sdp->sd_statfs_spin); 1124 1125 *sc = *m_sc; 1126 sc->sc_total += l_sc->sc_total; 1127 sc->sc_free += l_sc->sc_free; 1128 sc->sc_dinodes += l_sc->sc_dinodes; 1129 1130 spin_unlock(&sdp->sd_statfs_spin); 1131 1132 if (sc->sc_free < 0) 1133 sc->sc_free = 0; 1134 if (sc->sc_free > sc->sc_total) 1135 sc->sc_free = sc->sc_total; 1136 if (sc->sc_dinodes < 0) 1137 sc->sc_dinodes = 0; 1138 1139 return 0; 1140 } 1141 1142 /** 1143 * gfs2_statfs - Gather and return stats about the filesystem 1144 * @sb: The superblock 1145 * @statfsbuf: The buffer 1146 * 1147 * Returns: 0 on success or error code 1148 */ 1149 1150 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 1151 { 1152 struct super_block *sb = dentry->d_inode->i_sb; 1153 struct gfs2_sbd *sdp = sb->s_fs_info; 1154 struct gfs2_statfs_change_host sc; 1155 int error; 1156 1157 error = gfs2_rindex_update(sdp); 1158 if (error) 1159 return error; 1160 1161 if (gfs2_tune_get(sdp, gt_statfs_slow)) 1162 error = gfs2_statfs_slow(sdp, &sc); 1163 else 1164 error = gfs2_statfs_i(sdp, &sc); 1165 1166 if (error) 1167 return error; 1168 1169 buf->f_type = GFS2_MAGIC; 1170 buf->f_bsize = sdp->sd_sb.sb_bsize; 1171 buf->f_blocks = sc.sc_total; 1172 buf->f_bfree = sc.sc_free; 1173 buf->f_bavail = sc.sc_free; 1174 buf->f_files = sc.sc_dinodes + sc.sc_free; 1175 buf->f_ffree = sc.sc_free; 1176 buf->f_namelen = GFS2_FNAMESIZE; 1177 1178 return 0; 1179 } 1180 1181 /** 1182 * gfs2_remount_fs - called when the FS is remounted 1183 * @sb: the filesystem 1184 * @flags: the remount flags 1185 * @data: extra data passed in (not used right now) 1186 * 1187 * Returns: errno 1188 */ 1189 1190 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) 1191 { 1192 struct gfs2_sbd *sdp = sb->s_fs_info; 1193 struct gfs2_args args = sdp->sd_args; /* Default to current settings */ 1194 struct gfs2_tune *gt = &sdp->sd_tune; 1195 int error; 1196 1197 spin_lock(>->gt_spin); 1198 args.ar_commit = gt->gt_logd_secs; 1199 args.ar_quota_quantum = gt->gt_quota_quantum; 1200 if (gt->gt_statfs_slow) 1201 args.ar_statfs_quantum = 0; 1202 else 1203 args.ar_statfs_quantum = gt->gt_statfs_quantum; 1204 spin_unlock(>->gt_spin); 1205 error = gfs2_mount_args(&args, data); 1206 if (error) 1207 return error; 1208 1209 /* Not allowed to change locking details */ 1210 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) || 1211 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) || 1212 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata)) 1213 return -EINVAL; 1214 1215 /* Some flags must not be changed */ 1216 if (args_neq(&args, &sdp->sd_args, spectator) || 1217 args_neq(&args, &sdp->sd_args, localflocks) || 1218 args_neq(&args, &sdp->sd_args, meta)) 1219 return -EINVAL; 1220 1221 if (sdp->sd_args.ar_spectator) 1222 *flags |= MS_RDONLY; 1223 1224 if ((sb->s_flags ^ *flags) & MS_RDONLY) { 1225 if (*flags & MS_RDONLY) 1226 error = gfs2_make_fs_ro(sdp); 1227 else 1228 error = gfs2_make_fs_rw(sdp); 1229 if (error) 1230 return error; 1231 } 1232 1233 sdp->sd_args = args; 1234 if (sdp->sd_args.ar_posix_acl) 1235 sb->s_flags |= MS_POSIXACL; 1236 else 1237 sb->s_flags &= ~MS_POSIXACL; 1238 if (sdp->sd_args.ar_nobarrier) 1239 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1240 else 1241 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1242 spin_lock(>->gt_spin); 1243 gt->gt_logd_secs = args.ar_commit; 1244 gt->gt_quota_quantum = args.ar_quota_quantum; 1245 if (args.ar_statfs_quantum) { 1246 gt->gt_statfs_slow = 0; 1247 gt->gt_statfs_quantum = args.ar_statfs_quantum; 1248 } 1249 else { 1250 gt->gt_statfs_slow = 1; 1251 gt->gt_statfs_quantum = 30; 1252 } 1253 spin_unlock(>->gt_spin); 1254 1255 gfs2_online_uevent(sdp); 1256 return 0; 1257 } 1258 1259 /** 1260 * gfs2_drop_inode - Drop an inode (test for remote unlink) 1261 * @inode: The inode to drop 1262 * 1263 * If we've received a callback on an iopen lock then its because a 1264 * remote node tried to deallocate the inode but failed due to this node 1265 * still having the inode open. Here we mark the link count zero 1266 * since we know that it must have reached zero if the GLF_DEMOTE flag 1267 * is set on the iopen glock. If we didn't do a disk read since the 1268 * remote node removed the final link then we might otherwise miss 1269 * this event. This check ensures that this node will deallocate the 1270 * inode's blocks, or alternatively pass the baton on to another 1271 * node for later deallocation. 1272 */ 1273 1274 static int gfs2_drop_inode(struct inode *inode) 1275 { 1276 struct gfs2_inode *ip = GFS2_I(inode); 1277 1278 if (inode->i_nlink) { 1279 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1280 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags)) 1281 clear_nlink(inode); 1282 } 1283 return generic_drop_inode(inode); 1284 } 1285 1286 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 1287 { 1288 do { 1289 if (d1 == d2) 1290 return 1; 1291 d1 = d1->d_parent; 1292 } while (!IS_ROOT(d1)); 1293 return 0; 1294 } 1295 1296 /** 1297 * gfs2_show_options - Show mount options for /proc/mounts 1298 * @s: seq_file structure 1299 * @root: root of this (sub)tree 1300 * 1301 * Returns: 0 on success or error code 1302 */ 1303 1304 static int gfs2_show_options(struct seq_file *s, struct dentry *root) 1305 { 1306 struct gfs2_sbd *sdp = root->d_sb->s_fs_info; 1307 struct gfs2_args *args = &sdp->sd_args; 1308 int val; 1309 1310 if (is_ancestor(root, sdp->sd_master_dir)) 1311 seq_printf(s, ",meta"); 1312 if (args->ar_lockproto[0]) 1313 seq_printf(s, ",lockproto=%s", args->ar_lockproto); 1314 if (args->ar_locktable[0]) 1315 seq_printf(s, ",locktable=%s", args->ar_locktable); 1316 if (args->ar_hostdata[0]) 1317 seq_printf(s, ",hostdata=%s", args->ar_hostdata); 1318 if (args->ar_spectator) 1319 seq_printf(s, ",spectator"); 1320 if (args->ar_localflocks) 1321 seq_printf(s, ",localflocks"); 1322 if (args->ar_debug) 1323 seq_printf(s, ",debug"); 1324 if (args->ar_posix_acl) 1325 seq_printf(s, ",acl"); 1326 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 1327 char *state; 1328 switch (args->ar_quota) { 1329 case GFS2_QUOTA_OFF: 1330 state = "off"; 1331 break; 1332 case GFS2_QUOTA_ACCOUNT: 1333 state = "account"; 1334 break; 1335 case GFS2_QUOTA_ON: 1336 state = "on"; 1337 break; 1338 default: 1339 state = "unknown"; 1340 break; 1341 } 1342 seq_printf(s, ",quota=%s", state); 1343 } 1344 if (args->ar_suiddir) 1345 seq_printf(s, ",suiddir"); 1346 if (args->ar_data != GFS2_DATA_DEFAULT) { 1347 char *state; 1348 switch (args->ar_data) { 1349 case GFS2_DATA_WRITEBACK: 1350 state = "writeback"; 1351 break; 1352 case GFS2_DATA_ORDERED: 1353 state = "ordered"; 1354 break; 1355 default: 1356 state = "unknown"; 1357 break; 1358 } 1359 seq_printf(s, ",data=%s", state); 1360 } 1361 if (args->ar_discard) 1362 seq_printf(s, ",discard"); 1363 val = sdp->sd_tune.gt_logd_secs; 1364 if (val != 30) 1365 seq_printf(s, ",commit=%d", val); 1366 val = sdp->sd_tune.gt_statfs_quantum; 1367 if (val != 30) 1368 seq_printf(s, ",statfs_quantum=%d", val); 1369 else if (sdp->sd_tune.gt_statfs_slow) 1370 seq_puts(s, ",statfs_quantum=0"); 1371 val = sdp->sd_tune.gt_quota_quantum; 1372 if (val != 60) 1373 seq_printf(s, ",quota_quantum=%d", val); 1374 if (args->ar_statfs_percent) 1375 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1376 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1377 const char *state; 1378 1379 switch (args->ar_errors) { 1380 case GFS2_ERRORS_WITHDRAW: 1381 state = "withdraw"; 1382 break; 1383 case GFS2_ERRORS_PANIC: 1384 state = "panic"; 1385 break; 1386 default: 1387 state = "unknown"; 1388 break; 1389 } 1390 seq_printf(s, ",errors=%s", state); 1391 } 1392 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1393 seq_printf(s, ",nobarrier"); 1394 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1395 seq_printf(s, ",demote_interface_used"); 1396 if (args->ar_rgrplvb) 1397 seq_printf(s, ",rgrplvb"); 1398 return 0; 1399 } 1400 1401 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1402 { 1403 struct inode *inode = &ip->i_inode; 1404 struct gfs2_glock *gl = ip->i_gl; 1405 1406 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1407 truncate_inode_pages(&inode->i_data, 0); 1408 1409 if (atomic_read(&gl->gl_revokes) == 0) { 1410 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1411 clear_bit(GLF_DIRTY, &gl->gl_flags); 1412 } 1413 } 1414 1415 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1416 { 1417 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1418 struct gfs2_rgrpd *rgd; 1419 struct gfs2_holder gh; 1420 int error; 1421 1422 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1423 gfs2_consist_inode(ip); 1424 return -EIO; 1425 } 1426 1427 error = gfs2_rindex_update(sdp); 1428 if (error) 1429 return error; 1430 1431 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); 1432 if (error) 1433 return error; 1434 1435 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1436 if (!rgd) { 1437 gfs2_consist_inode(ip); 1438 error = -EIO; 1439 goto out_qs; 1440 } 1441 1442 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh); 1443 if (error) 1444 goto out_qs; 1445 1446 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1447 sdp->sd_jdesc->jd_blocks); 1448 if (error) 1449 goto out_rg_gunlock; 1450 1451 gfs2_free_di(rgd, ip); 1452 1453 gfs2_final_release_pages(ip); 1454 1455 gfs2_trans_end(sdp); 1456 1457 out_rg_gunlock: 1458 gfs2_glock_dq_uninit(&gh); 1459 out_qs: 1460 gfs2_quota_unhold(ip); 1461 return error; 1462 } 1463 1464 /** 1465 * gfs2_evict_inode - Remove an inode from cache 1466 * @inode: The inode to evict 1467 * 1468 * There are three cases to consider: 1469 * 1. i_nlink == 0, we are final opener (and must deallocate) 1470 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1471 * 3. i_nlink > 0 1472 * 1473 * If the fs is read only, then we have to treat all cases as per #3 1474 * since we are unable to do any deallocation. The inode will be 1475 * deallocated by the next read/write node to attempt an allocation 1476 * in the same resource group 1477 * 1478 * We have to (at the moment) hold the inodes main lock to cover 1479 * the gap between unlocking the shared lock on the iopen lock and 1480 * taking the exclusive lock. I'd rather do a shared -> exclusive 1481 * conversion on the iopen lock, but we can change that later. This 1482 * is safe, just less efficient. 1483 */ 1484 1485 static void gfs2_evict_inode(struct inode *inode) 1486 { 1487 struct super_block *sb = inode->i_sb; 1488 struct gfs2_sbd *sdp = sb->s_fs_info; 1489 struct gfs2_inode *ip = GFS2_I(inode); 1490 struct gfs2_holder gh; 1491 int error; 1492 1493 if (inode->i_nlink || (sb->s_flags & MS_RDONLY)) 1494 goto out; 1495 1496 /* Must not read inode block until block type has been verified */ 1497 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 1498 if (unlikely(error)) { 1499 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1500 goto out; 1501 } 1502 1503 if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { 1504 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1505 if (error) 1506 goto out_truncate; 1507 } 1508 1509 if (test_bit(GIF_INVALID, &ip->i_flags)) { 1510 error = gfs2_inode_refresh(ip); 1511 if (error) 1512 goto out_truncate; 1513 } 1514 1515 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1516 gfs2_glock_dq_wait(&ip->i_iopen_gh); 1517 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh); 1518 error = gfs2_glock_nq(&ip->i_iopen_gh); 1519 if (error) 1520 goto out_truncate; 1521 1522 /* Case 1 starts here */ 1523 1524 if (S_ISDIR(inode->i_mode) && 1525 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1526 error = gfs2_dir_exhash_dealloc(ip); 1527 if (error) 1528 goto out_unlock; 1529 } 1530 1531 if (ip->i_eattr) { 1532 error = gfs2_ea_dealloc(ip); 1533 if (error) 1534 goto out_unlock; 1535 } 1536 1537 if (!gfs2_is_stuffed(ip)) { 1538 error = gfs2_file_dealloc(ip); 1539 if (error) 1540 goto out_unlock; 1541 } 1542 1543 error = gfs2_dinode_dealloc(ip); 1544 goto out_unlock; 1545 1546 out_truncate: 1547 gfs2_log_flush(sdp, ip->i_gl); 1548 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1549 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 1550 filemap_fdatawrite(metamapping); 1551 filemap_fdatawait(metamapping); 1552 } 1553 write_inode_now(inode, 1); 1554 gfs2_ail_flush(ip->i_gl, 0); 1555 1556 /* Case 2 starts here */ 1557 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1558 if (error) 1559 goto out_unlock; 1560 /* Needs to be done before glock release & also in a transaction */ 1561 truncate_inode_pages(&inode->i_data, 0); 1562 gfs2_trans_end(sdp); 1563 1564 out_unlock: 1565 /* Error path for case 1 */ 1566 if (gfs2_rs_active(ip->i_res)) 1567 gfs2_rs_deltree(ip, ip->i_res); 1568 1569 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) 1570 gfs2_glock_dq(&ip->i_iopen_gh); 1571 gfs2_holder_uninit(&ip->i_iopen_gh); 1572 gfs2_glock_dq_uninit(&gh); 1573 if (error && error != GLR_TRYFAILED && error != -EROFS) 1574 fs_warn(sdp, "gfs2_evict_inode: %d\n", error); 1575 out: 1576 /* Case 3 starts here */ 1577 truncate_inode_pages(&inode->i_data, 0); 1578 gfs2_rs_delete(ip); 1579 clear_inode(inode); 1580 gfs2_dir_hash_inval(ip); 1581 ip->i_gl->gl_object = NULL; 1582 flush_delayed_work(&ip->i_gl->gl_work); 1583 gfs2_glock_add_to_lru(ip->i_gl); 1584 gfs2_glock_put(ip->i_gl); 1585 ip->i_gl = NULL; 1586 if (ip->i_iopen_gh.gh_gl) { 1587 ip->i_iopen_gh.gh_gl->gl_object = NULL; 1588 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1589 } 1590 } 1591 1592 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1593 { 1594 struct gfs2_inode *ip; 1595 1596 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1597 if (ip) { 1598 ip->i_flags = 0; 1599 ip->i_gl = NULL; 1600 ip->i_rgd = NULL; 1601 ip->i_res = NULL; 1602 } 1603 return &ip->i_inode; 1604 } 1605 1606 static void gfs2_i_callback(struct rcu_head *head) 1607 { 1608 struct inode *inode = container_of(head, struct inode, i_rcu); 1609 kmem_cache_free(gfs2_inode_cachep, inode); 1610 } 1611 1612 static void gfs2_destroy_inode(struct inode *inode) 1613 { 1614 call_rcu(&inode->i_rcu, gfs2_i_callback); 1615 } 1616 1617 const struct super_operations gfs2_super_ops = { 1618 .alloc_inode = gfs2_alloc_inode, 1619 .destroy_inode = gfs2_destroy_inode, 1620 .write_inode = gfs2_write_inode, 1621 .dirty_inode = gfs2_dirty_inode, 1622 .evict_inode = gfs2_evict_inode, 1623 .put_super = gfs2_put_super, 1624 .sync_fs = gfs2_sync_fs, 1625 .freeze_fs = gfs2_freeze, 1626 .unfreeze_fs = gfs2_unfreeze, 1627 .statfs = gfs2_statfs, 1628 .remount_fs = gfs2_remount_fs, 1629 .drop_inode = gfs2_drop_inode, 1630 .show_options = gfs2_show_options, 1631 }; 1632 1633