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_meta(l_ip->i_gl, l_bh); 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_meta(l_ip->i_gl, l_bh); 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_meta(m_ip->i_gl, m_bh); 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 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 667 { 668 struct gfs2_dinode *str = buf; 669 670 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 671 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); 672 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); 673 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); 674 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); 675 str->di_mode = cpu_to_be32(ip->i_inode.i_mode); 676 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode)); 677 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode)); 678 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); 679 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode)); 680 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); 681 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 682 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); 683 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); 684 685 str->di_goal_meta = cpu_to_be64(ip->i_goal); 686 str->di_goal_data = cpu_to_be64(ip->i_goal); 687 str->di_generation = cpu_to_be64(ip->i_generation); 688 689 str->di_flags = cpu_to_be32(ip->i_diskflags); 690 str->di_height = cpu_to_be16(ip->i_height); 691 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && 692 !(ip->i_diskflags & GFS2_DIF_EXHASH) ? 693 GFS2_FORMAT_DE : 0); 694 str->di_depth = cpu_to_be16(ip->i_depth); 695 str->di_entries = cpu_to_be32(ip->i_entries); 696 697 str->di_eattr = cpu_to_be64(ip->i_eattr); 698 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); 699 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); 700 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); 701 } 702 703 /** 704 * gfs2_write_inode - Make sure the inode is stable on the disk 705 * @inode: The inode 706 * @wbc: The writeback control structure 707 * 708 * Returns: errno 709 */ 710 711 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) 712 { 713 struct gfs2_inode *ip = GFS2_I(inode); 714 struct gfs2_sbd *sdp = GFS2_SB(inode); 715 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 716 struct backing_dev_info *bdi = metamapping->backing_dev_info; 717 int ret = 0; 718 719 if (wbc->sync_mode == WB_SYNC_ALL) 720 gfs2_log_flush(GFS2_SB(inode), ip->i_gl); 721 if (bdi->dirty_exceeded) 722 gfs2_ail1_flush(sdp, wbc); 723 else 724 filemap_fdatawrite(metamapping); 725 if (wbc->sync_mode == WB_SYNC_ALL) 726 ret = filemap_fdatawait(metamapping); 727 if (ret) 728 mark_inode_dirty_sync(inode); 729 return ret; 730 } 731 732 /** 733 * gfs2_dirty_inode - check for atime updates 734 * @inode: The inode in question 735 * @flags: The type of dirty 736 * 737 * Unfortunately it can be called under any combination of inode 738 * glock and transaction lock, so we have to check carefully. 739 * 740 * At the moment this deals only with atime - it should be possible 741 * to expand that role in future, once a review of the locking has 742 * been carried out. 743 */ 744 745 static void gfs2_dirty_inode(struct inode *inode, int flags) 746 { 747 struct gfs2_inode *ip = GFS2_I(inode); 748 struct gfs2_sbd *sdp = GFS2_SB(inode); 749 struct buffer_head *bh; 750 struct gfs2_holder gh; 751 int need_unlock = 0; 752 int need_endtrans = 0; 753 int ret; 754 755 if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC))) 756 return; 757 758 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { 759 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 760 if (ret) { 761 fs_err(sdp, "dirty_inode: glock %d\n", ret); 762 return; 763 } 764 need_unlock = 1; 765 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) 766 return; 767 768 if (current->journal_info == NULL) { 769 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 770 if (ret) { 771 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); 772 goto out; 773 } 774 need_endtrans = 1; 775 } 776 777 ret = gfs2_meta_inode_buffer(ip, &bh); 778 if (ret == 0) { 779 gfs2_trans_add_meta(ip->i_gl, bh); 780 gfs2_dinode_out(ip, bh->b_data); 781 brelse(bh); 782 } 783 784 if (need_endtrans) 785 gfs2_trans_end(sdp); 786 out: 787 if (need_unlock) 788 gfs2_glock_dq_uninit(&gh); 789 } 790 791 /** 792 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 793 * @sdp: the filesystem 794 * 795 * Returns: errno 796 */ 797 798 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp) 799 { 800 struct gfs2_holder t_gh; 801 int error; 802 803 flush_workqueue(gfs2_delete_workqueue); 804 gfs2_quota_sync(sdp->sd_vfs, 0); 805 gfs2_statfs_sync(sdp->sd_vfs, 0); 806 807 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE, 808 &t_gh); 809 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 810 return error; 811 812 gfs2_meta_syncfs(sdp); 813 gfs2_log_shutdown(sdp); 814 815 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 816 817 if (t_gh.gh_gl) 818 gfs2_glock_dq_uninit(&t_gh); 819 820 gfs2_quota_cleanup(sdp); 821 822 return error; 823 } 824 825 static int gfs2_umount_recovery_wait(void *word) 826 { 827 schedule(); 828 return 0; 829 } 830 831 /** 832 * gfs2_put_super - Unmount the filesystem 833 * @sb: The VFS superblock 834 * 835 */ 836 837 static void gfs2_put_super(struct super_block *sb) 838 { 839 struct gfs2_sbd *sdp = sb->s_fs_info; 840 int error; 841 struct gfs2_jdesc *jd; 842 843 /* No more recovery requests */ 844 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 845 smp_mb(); 846 847 /* Wait on outstanding recovery */ 848 restart: 849 spin_lock(&sdp->sd_jindex_spin); 850 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 851 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 852 continue; 853 spin_unlock(&sdp->sd_jindex_spin); 854 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 855 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE); 856 goto restart; 857 } 858 spin_unlock(&sdp->sd_jindex_spin); 859 860 kthread_stop(sdp->sd_quotad_process); 861 kthread_stop(sdp->sd_logd_process); 862 863 if (!(sb->s_flags & MS_RDONLY)) { 864 error = gfs2_make_fs_ro(sdp); 865 if (error) 866 gfs2_io_error(sdp); 867 } 868 /* At this point, we're through modifying the disk */ 869 870 /* Release stuff */ 871 872 iput(sdp->sd_jindex); 873 iput(sdp->sd_statfs_inode); 874 iput(sdp->sd_rindex); 875 iput(sdp->sd_quota_inode); 876 877 gfs2_glock_put(sdp->sd_rename_gl); 878 gfs2_glock_put(sdp->sd_trans_gl); 879 880 if (!sdp->sd_args.ar_spectator) { 881 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 882 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 883 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 884 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 885 iput(sdp->sd_sc_inode); 886 iput(sdp->sd_qc_inode); 887 } 888 889 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 890 gfs2_clear_rgrpd(sdp); 891 gfs2_jindex_free(sdp); 892 /* Take apart glock structures and buffer lists */ 893 gfs2_gl_hash_clear(sdp); 894 /* Unmount the locking protocol */ 895 gfs2_lm_unmount(sdp); 896 897 /* At this point, we're through participating in the lockspace */ 898 gfs2_sys_fs_del(sdp); 899 } 900 901 /** 902 * gfs2_sync_fs - sync the filesystem 903 * @sb: the superblock 904 * 905 * Flushes the log to disk. 906 */ 907 908 static int gfs2_sync_fs(struct super_block *sb, int wait) 909 { 910 struct gfs2_sbd *sdp = sb->s_fs_info; 911 912 gfs2_quota_sync(sb, -1); 913 if (wait && sdp) 914 gfs2_log_flush(sdp, NULL); 915 return 0; 916 } 917 918 /** 919 * gfs2_freeze - prevent further writes to the filesystem 920 * @sb: the VFS structure for the filesystem 921 * 922 */ 923 924 static int gfs2_freeze(struct super_block *sb) 925 { 926 struct gfs2_sbd *sdp = sb->s_fs_info; 927 int error; 928 929 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 930 return -EINVAL; 931 932 for (;;) { 933 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); 934 if (!error) 935 break; 936 937 switch (error) { 938 case -EBUSY: 939 fs_err(sdp, "waiting for recovery before freeze\n"); 940 break; 941 942 default: 943 fs_err(sdp, "error freezing FS: %d\n", error); 944 break; 945 } 946 947 fs_err(sdp, "retrying...\n"); 948 msleep(1000); 949 } 950 return 0; 951 } 952 953 /** 954 * gfs2_unfreeze - reallow writes to the filesystem 955 * @sb: the VFS structure for the filesystem 956 * 957 */ 958 959 static int gfs2_unfreeze(struct super_block *sb) 960 { 961 struct gfs2_sbd *sdp = sb->s_fs_info; 962 963 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 964 return 0; 965 } 966 967 /** 968 * statfs_fill - fill in the sg for a given RG 969 * @rgd: the RG 970 * @sc: the sc structure 971 * 972 * Returns: 0 on success, -ESTALE if the LVB is invalid 973 */ 974 975 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 976 struct gfs2_statfs_change_host *sc) 977 { 978 gfs2_rgrp_verify(rgd); 979 sc->sc_total += rgd->rd_data; 980 sc->sc_free += rgd->rd_free; 981 sc->sc_dinodes += rgd->rd_dinodes; 982 return 0; 983 } 984 985 /** 986 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 987 * @sdp: the filesystem 988 * @sc: the sc info that will be returned 989 * 990 * Any error (other than a signal) will cause this routine to fall back 991 * to the synchronous version. 992 * 993 * FIXME: This really shouldn't busy wait like this. 994 * 995 * Returns: errno 996 */ 997 998 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 999 { 1000 struct gfs2_rgrpd *rgd_next; 1001 struct gfs2_holder *gha, *gh; 1002 unsigned int slots = 64; 1003 unsigned int x; 1004 int done; 1005 int error = 0, err; 1006 1007 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 1008 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 1009 if (!gha) 1010 return -ENOMEM; 1011 1012 rgd_next = gfs2_rgrpd_get_first(sdp); 1013 1014 for (;;) { 1015 done = 1; 1016 1017 for (x = 0; x < slots; x++) { 1018 gh = gha + x; 1019 1020 if (gh->gh_gl && gfs2_glock_poll(gh)) { 1021 err = gfs2_glock_wait(gh); 1022 if (err) { 1023 gfs2_holder_uninit(gh); 1024 error = err; 1025 } else { 1026 if (!error) 1027 error = statfs_slow_fill( 1028 gh->gh_gl->gl_object, sc); 1029 gfs2_glock_dq_uninit(gh); 1030 } 1031 } 1032 1033 if (gh->gh_gl) 1034 done = 0; 1035 else if (rgd_next && !error) { 1036 error = gfs2_glock_nq_init(rgd_next->rd_gl, 1037 LM_ST_SHARED, 1038 GL_ASYNC, 1039 gh); 1040 rgd_next = gfs2_rgrpd_get_next(rgd_next); 1041 done = 0; 1042 } 1043 1044 if (signal_pending(current)) 1045 error = -ERESTARTSYS; 1046 } 1047 1048 if (done) 1049 break; 1050 1051 yield(); 1052 } 1053 1054 kfree(gha); 1055 return error; 1056 } 1057 1058 /** 1059 * gfs2_statfs_i - Do a statfs 1060 * @sdp: the filesystem 1061 * @sg: the sg structure 1062 * 1063 * Returns: errno 1064 */ 1065 1066 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 1067 { 1068 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 1069 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 1070 1071 spin_lock(&sdp->sd_statfs_spin); 1072 1073 *sc = *m_sc; 1074 sc->sc_total += l_sc->sc_total; 1075 sc->sc_free += l_sc->sc_free; 1076 sc->sc_dinodes += l_sc->sc_dinodes; 1077 1078 spin_unlock(&sdp->sd_statfs_spin); 1079 1080 if (sc->sc_free < 0) 1081 sc->sc_free = 0; 1082 if (sc->sc_free > sc->sc_total) 1083 sc->sc_free = sc->sc_total; 1084 if (sc->sc_dinodes < 0) 1085 sc->sc_dinodes = 0; 1086 1087 return 0; 1088 } 1089 1090 /** 1091 * gfs2_statfs - Gather and return stats about the filesystem 1092 * @sb: The superblock 1093 * @statfsbuf: The buffer 1094 * 1095 * Returns: 0 on success or error code 1096 */ 1097 1098 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 1099 { 1100 struct super_block *sb = dentry->d_inode->i_sb; 1101 struct gfs2_sbd *sdp = sb->s_fs_info; 1102 struct gfs2_statfs_change_host sc; 1103 int error; 1104 1105 error = gfs2_rindex_update(sdp); 1106 if (error) 1107 return error; 1108 1109 if (gfs2_tune_get(sdp, gt_statfs_slow)) 1110 error = gfs2_statfs_slow(sdp, &sc); 1111 else 1112 error = gfs2_statfs_i(sdp, &sc); 1113 1114 if (error) 1115 return error; 1116 1117 buf->f_type = GFS2_MAGIC; 1118 buf->f_bsize = sdp->sd_sb.sb_bsize; 1119 buf->f_blocks = sc.sc_total; 1120 buf->f_bfree = sc.sc_free; 1121 buf->f_bavail = sc.sc_free; 1122 buf->f_files = sc.sc_dinodes + sc.sc_free; 1123 buf->f_ffree = sc.sc_free; 1124 buf->f_namelen = GFS2_FNAMESIZE; 1125 1126 return 0; 1127 } 1128 1129 /** 1130 * gfs2_remount_fs - called when the FS is remounted 1131 * @sb: the filesystem 1132 * @flags: the remount flags 1133 * @data: extra data passed in (not used right now) 1134 * 1135 * Returns: errno 1136 */ 1137 1138 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) 1139 { 1140 struct gfs2_sbd *sdp = sb->s_fs_info; 1141 struct gfs2_args args = sdp->sd_args; /* Default to current settings */ 1142 struct gfs2_tune *gt = &sdp->sd_tune; 1143 int error; 1144 1145 spin_lock(>->gt_spin); 1146 args.ar_commit = gt->gt_logd_secs; 1147 args.ar_quota_quantum = gt->gt_quota_quantum; 1148 if (gt->gt_statfs_slow) 1149 args.ar_statfs_quantum = 0; 1150 else 1151 args.ar_statfs_quantum = gt->gt_statfs_quantum; 1152 spin_unlock(>->gt_spin); 1153 error = gfs2_mount_args(&args, data); 1154 if (error) 1155 return error; 1156 1157 /* Not allowed to change locking details */ 1158 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) || 1159 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) || 1160 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata)) 1161 return -EINVAL; 1162 1163 /* Some flags must not be changed */ 1164 if (args_neq(&args, &sdp->sd_args, spectator) || 1165 args_neq(&args, &sdp->sd_args, localflocks) || 1166 args_neq(&args, &sdp->sd_args, meta)) 1167 return -EINVAL; 1168 1169 if (sdp->sd_args.ar_spectator) 1170 *flags |= MS_RDONLY; 1171 1172 if ((sb->s_flags ^ *flags) & MS_RDONLY) { 1173 if (*flags & MS_RDONLY) 1174 error = gfs2_make_fs_ro(sdp); 1175 else 1176 error = gfs2_make_fs_rw(sdp); 1177 if (error) 1178 return error; 1179 } 1180 1181 sdp->sd_args = args; 1182 if (sdp->sd_args.ar_posix_acl) 1183 sb->s_flags |= MS_POSIXACL; 1184 else 1185 sb->s_flags &= ~MS_POSIXACL; 1186 if (sdp->sd_args.ar_nobarrier) 1187 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1188 else 1189 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1190 spin_lock(>->gt_spin); 1191 gt->gt_logd_secs = args.ar_commit; 1192 gt->gt_quota_quantum = args.ar_quota_quantum; 1193 if (args.ar_statfs_quantum) { 1194 gt->gt_statfs_slow = 0; 1195 gt->gt_statfs_quantum = args.ar_statfs_quantum; 1196 } 1197 else { 1198 gt->gt_statfs_slow = 1; 1199 gt->gt_statfs_quantum = 30; 1200 } 1201 spin_unlock(>->gt_spin); 1202 1203 gfs2_online_uevent(sdp); 1204 return 0; 1205 } 1206 1207 /** 1208 * gfs2_drop_inode - Drop an inode (test for remote unlink) 1209 * @inode: The inode to drop 1210 * 1211 * If we've received a callback on an iopen lock then its because a 1212 * remote node tried to deallocate the inode but failed due to this node 1213 * still having the inode open. Here we mark the link count zero 1214 * since we know that it must have reached zero if the GLF_DEMOTE flag 1215 * is set on the iopen glock. If we didn't do a disk read since the 1216 * remote node removed the final link then we might otherwise miss 1217 * this event. This check ensures that this node will deallocate the 1218 * inode's blocks, or alternatively pass the baton on to another 1219 * node for later deallocation. 1220 */ 1221 1222 static int gfs2_drop_inode(struct inode *inode) 1223 { 1224 struct gfs2_inode *ip = GFS2_I(inode); 1225 1226 if (inode->i_nlink) { 1227 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1228 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags)) 1229 clear_nlink(inode); 1230 } 1231 return generic_drop_inode(inode); 1232 } 1233 1234 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 1235 { 1236 do { 1237 if (d1 == d2) 1238 return 1; 1239 d1 = d1->d_parent; 1240 } while (!IS_ROOT(d1)); 1241 return 0; 1242 } 1243 1244 /** 1245 * gfs2_show_options - Show mount options for /proc/mounts 1246 * @s: seq_file structure 1247 * @root: root of this (sub)tree 1248 * 1249 * Returns: 0 on success or error code 1250 */ 1251 1252 static int gfs2_show_options(struct seq_file *s, struct dentry *root) 1253 { 1254 struct gfs2_sbd *sdp = root->d_sb->s_fs_info; 1255 struct gfs2_args *args = &sdp->sd_args; 1256 int val; 1257 1258 if (is_ancestor(root, sdp->sd_master_dir)) 1259 seq_printf(s, ",meta"); 1260 if (args->ar_lockproto[0]) 1261 seq_printf(s, ",lockproto=%s", args->ar_lockproto); 1262 if (args->ar_locktable[0]) 1263 seq_printf(s, ",locktable=%s", args->ar_locktable); 1264 if (args->ar_hostdata[0]) 1265 seq_printf(s, ",hostdata=%s", args->ar_hostdata); 1266 if (args->ar_spectator) 1267 seq_printf(s, ",spectator"); 1268 if (args->ar_localflocks) 1269 seq_printf(s, ",localflocks"); 1270 if (args->ar_debug) 1271 seq_printf(s, ",debug"); 1272 if (args->ar_posix_acl) 1273 seq_printf(s, ",acl"); 1274 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 1275 char *state; 1276 switch (args->ar_quota) { 1277 case GFS2_QUOTA_OFF: 1278 state = "off"; 1279 break; 1280 case GFS2_QUOTA_ACCOUNT: 1281 state = "account"; 1282 break; 1283 case GFS2_QUOTA_ON: 1284 state = "on"; 1285 break; 1286 default: 1287 state = "unknown"; 1288 break; 1289 } 1290 seq_printf(s, ",quota=%s", state); 1291 } 1292 if (args->ar_suiddir) 1293 seq_printf(s, ",suiddir"); 1294 if (args->ar_data != GFS2_DATA_DEFAULT) { 1295 char *state; 1296 switch (args->ar_data) { 1297 case GFS2_DATA_WRITEBACK: 1298 state = "writeback"; 1299 break; 1300 case GFS2_DATA_ORDERED: 1301 state = "ordered"; 1302 break; 1303 default: 1304 state = "unknown"; 1305 break; 1306 } 1307 seq_printf(s, ",data=%s", state); 1308 } 1309 if (args->ar_discard) 1310 seq_printf(s, ",discard"); 1311 val = sdp->sd_tune.gt_logd_secs; 1312 if (val != 30) 1313 seq_printf(s, ",commit=%d", val); 1314 val = sdp->sd_tune.gt_statfs_quantum; 1315 if (val != 30) 1316 seq_printf(s, ",statfs_quantum=%d", val); 1317 else if (sdp->sd_tune.gt_statfs_slow) 1318 seq_puts(s, ",statfs_quantum=0"); 1319 val = sdp->sd_tune.gt_quota_quantum; 1320 if (val != 60) 1321 seq_printf(s, ",quota_quantum=%d", val); 1322 if (args->ar_statfs_percent) 1323 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1324 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1325 const char *state; 1326 1327 switch (args->ar_errors) { 1328 case GFS2_ERRORS_WITHDRAW: 1329 state = "withdraw"; 1330 break; 1331 case GFS2_ERRORS_PANIC: 1332 state = "panic"; 1333 break; 1334 default: 1335 state = "unknown"; 1336 break; 1337 } 1338 seq_printf(s, ",errors=%s", state); 1339 } 1340 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1341 seq_printf(s, ",nobarrier"); 1342 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1343 seq_printf(s, ",demote_interface_used"); 1344 if (args->ar_rgrplvb) 1345 seq_printf(s, ",rgrplvb"); 1346 return 0; 1347 } 1348 1349 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1350 { 1351 struct inode *inode = &ip->i_inode; 1352 struct gfs2_glock *gl = ip->i_gl; 1353 1354 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1355 truncate_inode_pages(&inode->i_data, 0); 1356 1357 if (atomic_read(&gl->gl_revokes) == 0) { 1358 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1359 clear_bit(GLF_DIRTY, &gl->gl_flags); 1360 } 1361 } 1362 1363 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1364 { 1365 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1366 struct gfs2_rgrpd *rgd; 1367 struct gfs2_holder gh; 1368 int error; 1369 1370 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1371 gfs2_consist_inode(ip); 1372 return -EIO; 1373 } 1374 1375 error = gfs2_rindex_update(sdp); 1376 if (error) 1377 return error; 1378 1379 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 1380 if (error) 1381 return error; 1382 1383 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1384 if (!rgd) { 1385 gfs2_consist_inode(ip); 1386 error = -EIO; 1387 goto out_qs; 1388 } 1389 1390 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh); 1391 if (error) 1392 goto out_qs; 1393 1394 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1395 sdp->sd_jdesc->jd_blocks); 1396 if (error) 1397 goto out_rg_gunlock; 1398 1399 gfs2_free_di(rgd, ip); 1400 1401 gfs2_final_release_pages(ip); 1402 1403 gfs2_trans_end(sdp); 1404 1405 out_rg_gunlock: 1406 gfs2_glock_dq_uninit(&gh); 1407 out_qs: 1408 gfs2_quota_unhold(ip); 1409 return error; 1410 } 1411 1412 /** 1413 * gfs2_evict_inode - Remove an inode from cache 1414 * @inode: The inode to evict 1415 * 1416 * There are three cases to consider: 1417 * 1. i_nlink == 0, we are final opener (and must deallocate) 1418 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1419 * 3. i_nlink > 0 1420 * 1421 * If the fs is read only, then we have to treat all cases as per #3 1422 * since we are unable to do any deallocation. The inode will be 1423 * deallocated by the next read/write node to attempt an allocation 1424 * in the same resource group 1425 * 1426 * We have to (at the moment) hold the inodes main lock to cover 1427 * the gap between unlocking the shared lock on the iopen lock and 1428 * taking the exclusive lock. I'd rather do a shared -> exclusive 1429 * conversion on the iopen lock, but we can change that later. This 1430 * is safe, just less efficient. 1431 */ 1432 1433 static void gfs2_evict_inode(struct inode *inode) 1434 { 1435 struct super_block *sb = inode->i_sb; 1436 struct gfs2_sbd *sdp = sb->s_fs_info; 1437 struct gfs2_inode *ip = GFS2_I(inode); 1438 struct gfs2_holder gh; 1439 int error; 1440 1441 if (inode->i_nlink || (sb->s_flags & MS_RDONLY)) 1442 goto out; 1443 1444 /* Must not read inode block until block type has been verified */ 1445 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 1446 if (unlikely(error)) { 1447 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1448 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1449 goto out; 1450 } 1451 1452 if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { 1453 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1454 if (error) 1455 goto out_truncate; 1456 } 1457 1458 if (test_bit(GIF_INVALID, &ip->i_flags)) { 1459 error = gfs2_inode_refresh(ip); 1460 if (error) 1461 goto out_truncate; 1462 } 1463 1464 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1465 gfs2_glock_dq_wait(&ip->i_iopen_gh); 1466 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh); 1467 error = gfs2_glock_nq(&ip->i_iopen_gh); 1468 if (error) 1469 goto out_truncate; 1470 1471 /* Case 1 starts here */ 1472 1473 if (S_ISDIR(inode->i_mode) && 1474 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1475 error = gfs2_dir_exhash_dealloc(ip); 1476 if (error) 1477 goto out_unlock; 1478 } 1479 1480 if (ip->i_eattr) { 1481 error = gfs2_ea_dealloc(ip); 1482 if (error) 1483 goto out_unlock; 1484 } 1485 1486 if (!gfs2_is_stuffed(ip)) { 1487 error = gfs2_file_dealloc(ip); 1488 if (error) 1489 goto out_unlock; 1490 } 1491 1492 error = gfs2_dinode_dealloc(ip); 1493 goto out_unlock; 1494 1495 out_truncate: 1496 gfs2_log_flush(sdp, ip->i_gl); 1497 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1498 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 1499 filemap_fdatawrite(metamapping); 1500 filemap_fdatawait(metamapping); 1501 } 1502 write_inode_now(inode, 1); 1503 gfs2_ail_flush(ip->i_gl, 0); 1504 1505 /* Case 2 starts here */ 1506 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1507 if (error) 1508 goto out_unlock; 1509 /* Needs to be done before glock release & also in a transaction */ 1510 truncate_inode_pages(&inode->i_data, 0); 1511 gfs2_trans_end(sdp); 1512 1513 out_unlock: 1514 /* Error path for case 1 */ 1515 if (gfs2_rs_active(ip->i_res)) 1516 gfs2_rs_deltree(ip->i_res); 1517 1518 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1519 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1520 gfs2_glock_dq(&ip->i_iopen_gh); 1521 } 1522 gfs2_holder_uninit(&ip->i_iopen_gh); 1523 gfs2_glock_dq_uninit(&gh); 1524 if (error && error != GLR_TRYFAILED && error != -EROFS) 1525 fs_warn(sdp, "gfs2_evict_inode: %d\n", error); 1526 out: 1527 /* Case 3 starts here */ 1528 truncate_inode_pages(&inode->i_data, 0); 1529 gfs2_rs_delete(ip, NULL); 1530 gfs2_ordered_del_inode(ip); 1531 clear_inode(inode); 1532 gfs2_dir_hash_inval(ip); 1533 ip->i_gl->gl_object = NULL; 1534 flush_delayed_work(&ip->i_gl->gl_work); 1535 gfs2_glock_add_to_lru(ip->i_gl); 1536 gfs2_glock_put(ip->i_gl); 1537 ip->i_gl = NULL; 1538 if (ip->i_iopen_gh.gh_gl) { 1539 ip->i_iopen_gh.gh_gl->gl_object = NULL; 1540 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1541 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1542 } 1543 } 1544 1545 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1546 { 1547 struct gfs2_inode *ip; 1548 1549 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1550 if (ip) { 1551 ip->i_flags = 0; 1552 ip->i_gl = NULL; 1553 ip->i_rgd = NULL; 1554 ip->i_res = 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 kmem_cache_free(gfs2_inode_cachep, inode); 1563 } 1564 1565 static void gfs2_destroy_inode(struct inode *inode) 1566 { 1567 call_rcu(&inode->i_rcu, gfs2_i_callback); 1568 } 1569 1570 const struct super_operations gfs2_super_ops = { 1571 .alloc_inode = gfs2_alloc_inode, 1572 .destroy_inode = gfs2_destroy_inode, 1573 .write_inode = gfs2_write_inode, 1574 .dirty_inode = gfs2_dirty_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