1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/bio.h> 10 #include <linux/sched/signal.h> 11 #include <linux/slab.h> 12 #include <linux/spinlock.h> 13 #include <linux/completion.h> 14 #include <linux/buffer_head.h> 15 #include <linux/statfs.h> 16 #include <linux/seq_file.h> 17 #include <linux/mount.h> 18 #include <linux/kthread.h> 19 #include <linux/delay.h> 20 #include <linux/gfs2_ondisk.h> 21 #include <linux/crc32.h> 22 #include <linux/time.h> 23 #include <linux/wait.h> 24 #include <linux/writeback.h> 25 #include <linux/backing-dev.h> 26 #include <linux/kernel.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 #include "lops.h" 46 47 /** 48 * gfs2_jindex_free - Clear all the journal index information 49 * @sdp: The GFS2 superblock 50 * 51 */ 52 53 void gfs2_jindex_free(struct gfs2_sbd *sdp) 54 { 55 struct list_head list; 56 struct gfs2_jdesc *jd; 57 58 spin_lock(&sdp->sd_jindex_spin); 59 list_add(&list, &sdp->sd_jindex_list); 60 list_del_init(&sdp->sd_jindex_list); 61 sdp->sd_journals = 0; 62 spin_unlock(&sdp->sd_jindex_spin); 63 64 sdp->sd_jdesc = NULL; 65 while (!list_empty(&list)) { 66 jd = list_first_entry(&list, struct gfs2_jdesc, jd_list); 67 gfs2_free_journal_extents(jd); 68 list_del(&jd->jd_list); 69 iput(jd->jd_inode); 70 jd->jd_inode = NULL; 71 kfree(jd); 72 } 73 } 74 75 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) 76 { 77 struct gfs2_jdesc *jd; 78 int found = 0; 79 80 list_for_each_entry(jd, head, jd_list) { 81 if (jd->jd_jid == jid) { 82 found = 1; 83 break; 84 } 85 } 86 87 if (!found) 88 jd = NULL; 89 90 return jd; 91 } 92 93 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) 94 { 95 struct gfs2_jdesc *jd; 96 97 spin_lock(&sdp->sd_jindex_spin); 98 jd = jdesc_find_i(&sdp->sd_jindex_list, jid); 99 spin_unlock(&sdp->sd_jindex_spin); 100 101 return jd; 102 } 103 104 int gfs2_jdesc_check(struct gfs2_jdesc *jd) 105 { 106 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 107 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 108 u64 size = i_size_read(jd->jd_inode); 109 110 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30))) 111 return -EIO; 112 113 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift; 114 115 if (gfs2_write_alloc_required(ip, 0, size)) { 116 gfs2_consist_inode(ip); 117 return -EIO; 118 } 119 120 return 0; 121 } 122 123 static int init_threads(struct gfs2_sbd *sdp) 124 { 125 struct task_struct *p; 126 int error = 0; 127 128 p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); 129 if (IS_ERR(p)) { 130 error = PTR_ERR(p); 131 fs_err(sdp, "can't start logd thread: %d\n", error); 132 return error; 133 } 134 sdp->sd_logd_process = p; 135 136 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); 137 if (IS_ERR(p)) { 138 error = PTR_ERR(p); 139 fs_err(sdp, "can't start quotad thread: %d\n", error); 140 goto fail; 141 } 142 sdp->sd_quotad_process = p; 143 return 0; 144 145 fail: 146 kthread_stop(sdp->sd_logd_process); 147 sdp->sd_logd_process = NULL; 148 return error; 149 } 150 151 /** 152 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one 153 * @sdp: the filesystem 154 * 155 * Returns: errno 156 */ 157 158 int gfs2_make_fs_rw(struct gfs2_sbd *sdp) 159 { 160 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 161 struct gfs2_glock *j_gl = ip->i_gl; 162 struct gfs2_holder freeze_gh; 163 struct gfs2_log_header_host head; 164 int error; 165 166 error = init_threads(sdp); 167 if (error) 168 return error; 169 170 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 171 LM_FLAG_NOEXP | GL_EXACT, 172 &freeze_gh); 173 if (error) 174 goto fail_threads; 175 176 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 177 if (gfs2_withdrawn(sdp)) { 178 error = -EIO; 179 goto fail; 180 } 181 182 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false); 183 if (error || gfs2_withdrawn(sdp)) 184 goto fail; 185 186 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 187 gfs2_consist(sdp); 188 error = -EIO; 189 goto fail; 190 } 191 192 /* Initialize some head of the log stuff */ 193 sdp->sd_log_sequence = head.lh_sequence + 1; 194 gfs2_log_pointers_init(sdp, head.lh_blkno); 195 196 error = gfs2_quota_init(sdp); 197 if (error || gfs2_withdrawn(sdp)) 198 goto fail; 199 200 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 201 202 gfs2_glock_dq_uninit(&freeze_gh); 203 204 return 0; 205 206 fail: 207 gfs2_glock_dq_uninit(&freeze_gh); 208 fail_threads: 209 if (sdp->sd_quotad_process) 210 kthread_stop(sdp->sd_quotad_process); 211 sdp->sd_quotad_process = NULL; 212 if (sdp->sd_logd_process) 213 kthread_stop(sdp->sd_logd_process); 214 sdp->sd_logd_process = NULL; 215 return error; 216 } 217 218 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) 219 { 220 const struct gfs2_statfs_change *str = buf; 221 222 sc->sc_total = be64_to_cpu(str->sc_total); 223 sc->sc_free = be64_to_cpu(str->sc_free); 224 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); 225 } 226 227 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) 228 { 229 struct gfs2_statfs_change *str = buf; 230 231 str->sc_total = cpu_to_be64(sc->sc_total); 232 str->sc_free = cpu_to_be64(sc->sc_free); 233 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); 234 } 235 236 int gfs2_statfs_init(struct gfs2_sbd *sdp) 237 { 238 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 239 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 240 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 241 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 242 struct buffer_head *m_bh, *l_bh; 243 struct gfs2_holder gh; 244 int error; 245 246 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 247 &gh); 248 if (error) 249 return error; 250 251 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 252 if (error) 253 goto out; 254 255 if (sdp->sd_args.ar_spectator) { 256 spin_lock(&sdp->sd_statfs_spin); 257 gfs2_statfs_change_in(m_sc, m_bh->b_data + 258 sizeof(struct gfs2_dinode)); 259 spin_unlock(&sdp->sd_statfs_spin); 260 } else { 261 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 262 if (error) 263 goto out_m_bh; 264 265 spin_lock(&sdp->sd_statfs_spin); 266 gfs2_statfs_change_in(m_sc, m_bh->b_data + 267 sizeof(struct gfs2_dinode)); 268 gfs2_statfs_change_in(l_sc, l_bh->b_data + 269 sizeof(struct gfs2_dinode)); 270 spin_unlock(&sdp->sd_statfs_spin); 271 272 brelse(l_bh); 273 } 274 275 out_m_bh: 276 brelse(m_bh); 277 out: 278 gfs2_glock_dq_uninit(&gh); 279 return 0; 280 } 281 282 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, 283 s64 dinodes) 284 { 285 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 286 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 287 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 288 struct buffer_head *l_bh; 289 s64 x, y; 290 int need_sync = 0; 291 int error; 292 293 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 294 if (error) 295 return; 296 297 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 298 299 spin_lock(&sdp->sd_statfs_spin); 300 l_sc->sc_total += total; 301 l_sc->sc_free += free; 302 l_sc->sc_dinodes += dinodes; 303 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); 304 if (sdp->sd_args.ar_statfs_percent) { 305 x = 100 * l_sc->sc_free; 306 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent; 307 if (x >= y || x <= -y) 308 need_sync = 1; 309 } 310 spin_unlock(&sdp->sd_statfs_spin); 311 312 brelse(l_bh); 313 if (need_sync) 314 gfs2_wake_up_statfs(sdp); 315 } 316 317 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh, 318 struct buffer_head *l_bh) 319 { 320 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 321 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 322 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 323 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 324 325 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 326 gfs2_trans_add_meta(m_ip->i_gl, m_bh); 327 328 spin_lock(&sdp->sd_statfs_spin); 329 m_sc->sc_total += l_sc->sc_total; 330 m_sc->sc_free += l_sc->sc_free; 331 m_sc->sc_dinodes += l_sc->sc_dinodes; 332 memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); 333 memset(l_bh->b_data + sizeof(struct gfs2_dinode), 334 0, sizeof(struct gfs2_statfs_change)); 335 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); 336 spin_unlock(&sdp->sd_statfs_spin); 337 } 338 339 int gfs2_statfs_sync(struct super_block *sb, int type) 340 { 341 struct gfs2_sbd *sdp = sb->s_fs_info; 342 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 343 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 344 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 345 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 346 struct gfs2_holder gh; 347 struct buffer_head *m_bh, *l_bh; 348 int error; 349 350 sb_start_write(sb); 351 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 352 &gh); 353 if (error) 354 goto out; 355 356 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 357 if (error) 358 goto out_unlock; 359 360 spin_lock(&sdp->sd_statfs_spin); 361 gfs2_statfs_change_in(m_sc, m_bh->b_data + 362 sizeof(struct gfs2_dinode)); 363 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { 364 spin_unlock(&sdp->sd_statfs_spin); 365 goto out_bh; 366 } 367 spin_unlock(&sdp->sd_statfs_spin); 368 369 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 370 if (error) 371 goto out_bh; 372 373 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 374 if (error) 375 goto out_bh2; 376 377 update_statfs(sdp, m_bh, l_bh); 378 sdp->sd_statfs_force_sync = 0; 379 380 gfs2_trans_end(sdp); 381 382 out_bh2: 383 brelse(l_bh); 384 out_bh: 385 brelse(m_bh); 386 out_unlock: 387 gfs2_glock_dq_uninit(&gh); 388 out: 389 sb_end_write(sb); 390 return error; 391 } 392 393 struct lfcc { 394 struct list_head list; 395 struct gfs2_holder gh; 396 }; 397 398 /** 399 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all 400 * journals are clean 401 * @sdp: the file system 402 * @state: the state to put the transaction lock into 403 * @t_gh: the hold on the transaction lock 404 * 405 * Returns: errno 406 */ 407 408 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp) 409 { 410 struct gfs2_inode *ip; 411 struct gfs2_jdesc *jd; 412 struct lfcc *lfcc; 413 LIST_HEAD(list); 414 struct gfs2_log_header_host lh; 415 int error; 416 417 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 418 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); 419 if (!lfcc) { 420 error = -ENOMEM; 421 goto out; 422 } 423 ip = GFS2_I(jd->jd_inode); 424 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); 425 if (error) { 426 kfree(lfcc); 427 goto out; 428 } 429 list_add(&lfcc->list, &list); 430 } 431 432 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE, 433 LM_FLAG_NOEXP, &sdp->sd_freeze_gh); 434 if (error) 435 goto out; 436 437 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 438 error = gfs2_jdesc_check(jd); 439 if (error) 440 break; 441 error = gfs2_find_jhead(jd, &lh, false); 442 if (error) 443 break; 444 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 445 error = -EBUSY; 446 break; 447 } 448 } 449 450 if (error) 451 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 452 453 out: 454 while (!list_empty(&list)) { 455 lfcc = list_first_entry(&list, struct lfcc, list); 456 list_del(&lfcc->list); 457 gfs2_glock_dq_uninit(&lfcc->gh); 458 kfree(lfcc); 459 } 460 return error; 461 } 462 463 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 464 { 465 struct gfs2_dinode *str = buf; 466 467 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 468 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); 469 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); 470 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); 471 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); 472 str->di_mode = cpu_to_be32(ip->i_inode.i_mode); 473 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode)); 474 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode)); 475 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); 476 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode)); 477 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); 478 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 479 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); 480 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); 481 482 str->di_goal_meta = cpu_to_be64(ip->i_goal); 483 str->di_goal_data = cpu_to_be64(ip->i_goal); 484 str->di_generation = cpu_to_be64(ip->i_generation); 485 486 str->di_flags = cpu_to_be32(ip->i_diskflags); 487 str->di_height = cpu_to_be16(ip->i_height); 488 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && 489 !(ip->i_diskflags & GFS2_DIF_EXHASH) ? 490 GFS2_FORMAT_DE : 0); 491 str->di_depth = cpu_to_be16(ip->i_depth); 492 str->di_entries = cpu_to_be32(ip->i_entries); 493 494 str->di_eattr = cpu_to_be64(ip->i_eattr); 495 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); 496 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); 497 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); 498 } 499 500 /** 501 * gfs2_write_inode - Make sure the inode is stable on the disk 502 * @inode: The inode 503 * @wbc: The writeback control structure 504 * 505 * Returns: errno 506 */ 507 508 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) 509 { 510 struct gfs2_inode *ip = GFS2_I(inode); 511 struct gfs2_sbd *sdp = GFS2_SB(inode); 512 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 513 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host); 514 int ret = 0; 515 bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip)); 516 517 if (flush_all) 518 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, 519 GFS2_LOG_HEAD_FLUSH_NORMAL | 520 GFS2_LFC_WRITE_INODE); 521 if (bdi->wb.dirty_exceeded) 522 gfs2_ail1_flush(sdp, wbc); 523 else 524 filemap_fdatawrite(metamapping); 525 if (flush_all) 526 ret = filemap_fdatawait(metamapping); 527 if (ret) 528 mark_inode_dirty_sync(inode); 529 else { 530 spin_lock(&inode->i_lock); 531 if (!(inode->i_flags & I_DIRTY)) 532 gfs2_ordered_del_inode(ip); 533 spin_unlock(&inode->i_lock); 534 } 535 return ret; 536 } 537 538 /** 539 * gfs2_dirty_inode - check for atime updates 540 * @inode: The inode in question 541 * @flags: The type of dirty 542 * 543 * Unfortunately it can be called under any combination of inode 544 * glock and transaction lock, so we have to check carefully. 545 * 546 * At the moment this deals only with atime - it should be possible 547 * to expand that role in future, once a review of the locking has 548 * been carried out. 549 */ 550 551 static void gfs2_dirty_inode(struct inode *inode, int flags) 552 { 553 struct gfs2_inode *ip = GFS2_I(inode); 554 struct gfs2_sbd *sdp = GFS2_SB(inode); 555 struct buffer_head *bh; 556 struct gfs2_holder gh; 557 int need_unlock = 0; 558 int need_endtrans = 0; 559 int ret; 560 561 if (!(flags & I_DIRTY_INODE)) 562 return; 563 if (unlikely(gfs2_withdrawn(sdp))) 564 return; 565 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { 566 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 567 if (ret) { 568 fs_err(sdp, "dirty_inode: glock %d\n", ret); 569 return; 570 } 571 need_unlock = 1; 572 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) 573 return; 574 575 if (current->journal_info == NULL) { 576 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 577 if (ret) { 578 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); 579 goto out; 580 } 581 need_endtrans = 1; 582 } 583 584 ret = gfs2_meta_inode_buffer(ip, &bh); 585 if (ret == 0) { 586 gfs2_trans_add_meta(ip->i_gl, bh); 587 gfs2_dinode_out(ip, bh->b_data); 588 brelse(bh); 589 } 590 591 if (need_endtrans) 592 gfs2_trans_end(sdp); 593 out: 594 if (need_unlock) 595 gfs2_glock_dq_uninit(&gh); 596 } 597 598 /** 599 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 600 * @sdp: the filesystem 601 * 602 * Returns: errno 603 */ 604 605 int gfs2_make_fs_ro(struct gfs2_sbd *sdp) 606 { 607 struct gfs2_holder freeze_gh; 608 int error = 0; 609 int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 610 611 gfs2_holder_mark_uninitialized(&freeze_gh); 612 if (sdp->sd_freeze_gl && 613 !gfs2_glock_is_locked_by_me(sdp->sd_freeze_gl)) { 614 if (!log_write_allowed) { 615 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, 616 LM_ST_SHARED, LM_FLAG_TRY | 617 LM_FLAG_NOEXP | GL_EXACT, 618 &freeze_gh); 619 if (error == GLR_TRYFAILED) 620 error = 0; 621 } else { 622 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, 623 LM_ST_SHARED, 624 LM_FLAG_NOEXP | GL_EXACT, 625 &freeze_gh); 626 if (error && !gfs2_withdrawn(sdp)) 627 return error; 628 } 629 } 630 631 gfs2_flush_delete_work(sdp); 632 if (!log_write_allowed && current == sdp->sd_quotad_process) 633 fs_warn(sdp, "The quotad daemon is withdrawing.\n"); 634 else if (sdp->sd_quotad_process) 635 kthread_stop(sdp->sd_quotad_process); 636 sdp->sd_quotad_process = NULL; 637 638 if (!log_write_allowed && current == sdp->sd_logd_process) 639 fs_warn(sdp, "The logd daemon is withdrawing.\n"); 640 else if (sdp->sd_logd_process) 641 kthread_stop(sdp->sd_logd_process); 642 sdp->sd_logd_process = NULL; 643 644 if (log_write_allowed) { 645 gfs2_quota_sync(sdp->sd_vfs, 0); 646 gfs2_statfs_sync(sdp->sd_vfs, 0); 647 648 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN | 649 GFS2_LFC_MAKE_FS_RO); 650 wait_event(sdp->sd_reserving_log_wait, 651 atomic_read(&sdp->sd_reserving_log) == 0); 652 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == 653 sdp->sd_jdesc->jd_blocks); 654 } else { 655 wait_event_timeout(sdp->sd_reserving_log_wait, 656 atomic_read(&sdp->sd_reserving_log) == 0, 657 HZ * 5); 658 } 659 if (gfs2_holder_initialized(&freeze_gh)) 660 gfs2_glock_dq_uninit(&freeze_gh); 661 662 gfs2_quota_cleanup(sdp); 663 664 if (!log_write_allowed) 665 sdp->sd_vfs->s_flags |= SB_RDONLY; 666 667 return error; 668 } 669 670 /** 671 * gfs2_put_super - Unmount the filesystem 672 * @sb: The VFS superblock 673 * 674 */ 675 676 static void gfs2_put_super(struct super_block *sb) 677 { 678 struct gfs2_sbd *sdp = sb->s_fs_info; 679 int error; 680 struct gfs2_jdesc *jd; 681 682 /* No more recovery requests */ 683 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 684 smp_mb(); 685 686 /* Wait on outstanding recovery */ 687 restart: 688 spin_lock(&sdp->sd_jindex_spin); 689 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 690 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 691 continue; 692 spin_unlock(&sdp->sd_jindex_spin); 693 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 694 TASK_UNINTERRUPTIBLE); 695 goto restart; 696 } 697 spin_unlock(&sdp->sd_jindex_spin); 698 699 if (!sb_rdonly(sb)) { 700 error = gfs2_make_fs_ro(sdp); 701 if (error) 702 gfs2_io_error(sdp); 703 } 704 /* At this point, we're through modifying the disk */ 705 706 /* Release stuff */ 707 708 iput(sdp->sd_jindex); 709 iput(sdp->sd_statfs_inode); 710 iput(sdp->sd_rindex); 711 iput(sdp->sd_quota_inode); 712 713 gfs2_glock_put(sdp->sd_rename_gl); 714 gfs2_glock_put(sdp->sd_freeze_gl); 715 716 if (!sdp->sd_args.ar_spectator) { 717 if (gfs2_holder_initialized(&sdp->sd_journal_gh)) 718 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 719 if (gfs2_holder_initialized(&sdp->sd_jinode_gh)) 720 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 721 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 722 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 723 iput(sdp->sd_sc_inode); 724 iput(sdp->sd_qc_inode); 725 } 726 727 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 728 gfs2_clear_rgrpd(sdp); 729 gfs2_jindex_free(sdp); 730 /* Take apart glock structures and buffer lists */ 731 gfs2_gl_hash_clear(sdp); 732 gfs2_delete_debugfs_file(sdp); 733 /* Unmount the locking protocol */ 734 gfs2_lm_unmount(sdp); 735 736 /* At this point, we're through participating in the lockspace */ 737 gfs2_sys_fs_del(sdp); 738 } 739 740 /** 741 * gfs2_sync_fs - sync the filesystem 742 * @sb: the superblock 743 * 744 * Flushes the log to disk. 745 */ 746 747 static int gfs2_sync_fs(struct super_block *sb, int wait) 748 { 749 struct gfs2_sbd *sdp = sb->s_fs_info; 750 751 gfs2_quota_sync(sb, -1); 752 if (wait) 753 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 754 GFS2_LFC_SYNC_FS); 755 return sdp->sd_log_error; 756 } 757 758 void gfs2_freeze_func(struct work_struct *work) 759 { 760 int error; 761 struct gfs2_holder freeze_gh; 762 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work); 763 struct super_block *sb = sdp->sd_vfs; 764 765 atomic_inc(&sb->s_active); 766 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 767 LM_FLAG_NOEXP | GL_EXACT, &freeze_gh); 768 if (error) { 769 fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error); 770 gfs2_assert_withdraw(sdp, 0); 771 } else { 772 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 773 error = thaw_super(sb); 774 if (error) { 775 fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n", 776 error); 777 gfs2_assert_withdraw(sdp, 0); 778 } 779 gfs2_glock_dq_uninit(&freeze_gh); 780 } 781 deactivate_super(sb); 782 clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags); 783 wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN); 784 return; 785 } 786 787 /** 788 * gfs2_freeze - prevent further writes to the filesystem 789 * @sb: the VFS structure for the filesystem 790 * 791 */ 792 793 static int gfs2_freeze(struct super_block *sb) 794 { 795 struct gfs2_sbd *sdp = sb->s_fs_info; 796 int error = 0; 797 798 mutex_lock(&sdp->sd_freeze_mutex); 799 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) 800 goto out; 801 802 for (;;) { 803 if (gfs2_withdrawn(sdp)) { 804 error = -EINVAL; 805 goto out; 806 } 807 808 error = gfs2_lock_fs_check_clean(sdp); 809 if (!error) 810 break; 811 812 if (error == -EBUSY) 813 fs_err(sdp, "waiting for recovery before freeze\n"); 814 else if (error == -EIO) { 815 fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due " 816 "to recovery error.\n"); 817 goto out; 818 } else { 819 fs_err(sdp, "error freezing FS: %d\n", error); 820 } 821 fs_err(sdp, "retrying...\n"); 822 msleep(1000); 823 } 824 set_bit(SDF_FS_FROZEN, &sdp->sd_flags); 825 out: 826 mutex_unlock(&sdp->sd_freeze_mutex); 827 return error; 828 } 829 830 /** 831 * gfs2_unfreeze - reallow writes to the filesystem 832 * @sb: the VFS structure for the filesystem 833 * 834 */ 835 836 static int gfs2_unfreeze(struct super_block *sb) 837 { 838 struct gfs2_sbd *sdp = sb->s_fs_info; 839 840 mutex_lock(&sdp->sd_freeze_mutex); 841 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN || 842 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) { 843 mutex_unlock(&sdp->sd_freeze_mutex); 844 return 0; 845 } 846 847 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 848 mutex_unlock(&sdp->sd_freeze_mutex); 849 return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE); 850 } 851 852 /** 853 * statfs_fill - fill in the sg for a given RG 854 * @rgd: the RG 855 * @sc: the sc structure 856 * 857 * Returns: 0 on success, -ESTALE if the LVB is invalid 858 */ 859 860 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 861 struct gfs2_statfs_change_host *sc) 862 { 863 gfs2_rgrp_verify(rgd); 864 sc->sc_total += rgd->rd_data; 865 sc->sc_free += rgd->rd_free; 866 sc->sc_dinodes += rgd->rd_dinodes; 867 return 0; 868 } 869 870 /** 871 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 872 * @sdp: the filesystem 873 * @sc: the sc info that will be returned 874 * 875 * Any error (other than a signal) will cause this routine to fall back 876 * to the synchronous version. 877 * 878 * FIXME: This really shouldn't busy wait like this. 879 * 880 * Returns: errno 881 */ 882 883 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 884 { 885 struct gfs2_rgrpd *rgd_next; 886 struct gfs2_holder *gha, *gh; 887 unsigned int slots = 64; 888 unsigned int x; 889 int done; 890 int error = 0, err; 891 892 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 893 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 894 if (!gha) 895 return -ENOMEM; 896 for (x = 0; x < slots; x++) 897 gfs2_holder_mark_uninitialized(gha + x); 898 899 rgd_next = gfs2_rgrpd_get_first(sdp); 900 901 for (;;) { 902 done = 1; 903 904 for (x = 0; x < slots; x++) { 905 gh = gha + x; 906 907 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) { 908 err = gfs2_glock_wait(gh); 909 if (err) { 910 gfs2_holder_uninit(gh); 911 error = err; 912 } else { 913 if (!error) { 914 struct gfs2_rgrpd *rgd = 915 gfs2_glock2rgrp(gh->gh_gl); 916 917 error = statfs_slow_fill(rgd, sc); 918 } 919 gfs2_glock_dq_uninit(gh); 920 } 921 } 922 923 if (gfs2_holder_initialized(gh)) 924 done = 0; 925 else if (rgd_next && !error) { 926 error = gfs2_glock_nq_init(rgd_next->rd_gl, 927 LM_ST_SHARED, 928 GL_ASYNC, 929 gh); 930 rgd_next = gfs2_rgrpd_get_next(rgd_next); 931 done = 0; 932 } 933 934 if (signal_pending(current)) 935 error = -ERESTARTSYS; 936 } 937 938 if (done) 939 break; 940 941 yield(); 942 } 943 944 kfree(gha); 945 return error; 946 } 947 948 /** 949 * gfs2_statfs_i - Do a statfs 950 * @sdp: the filesystem 951 * @sg: the sg structure 952 * 953 * Returns: errno 954 */ 955 956 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 957 { 958 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 959 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 960 961 spin_lock(&sdp->sd_statfs_spin); 962 963 *sc = *m_sc; 964 sc->sc_total += l_sc->sc_total; 965 sc->sc_free += l_sc->sc_free; 966 sc->sc_dinodes += l_sc->sc_dinodes; 967 968 spin_unlock(&sdp->sd_statfs_spin); 969 970 if (sc->sc_free < 0) 971 sc->sc_free = 0; 972 if (sc->sc_free > sc->sc_total) 973 sc->sc_free = sc->sc_total; 974 if (sc->sc_dinodes < 0) 975 sc->sc_dinodes = 0; 976 977 return 0; 978 } 979 980 /** 981 * gfs2_statfs - Gather and return stats about the filesystem 982 * @sb: The superblock 983 * @statfsbuf: The buffer 984 * 985 * Returns: 0 on success or error code 986 */ 987 988 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 989 { 990 struct super_block *sb = dentry->d_sb; 991 struct gfs2_sbd *sdp = sb->s_fs_info; 992 struct gfs2_statfs_change_host sc; 993 int error; 994 995 error = gfs2_rindex_update(sdp); 996 if (error) 997 return error; 998 999 if (gfs2_tune_get(sdp, gt_statfs_slow)) 1000 error = gfs2_statfs_slow(sdp, &sc); 1001 else 1002 error = gfs2_statfs_i(sdp, &sc); 1003 1004 if (error) 1005 return error; 1006 1007 buf->f_type = GFS2_MAGIC; 1008 buf->f_bsize = sdp->sd_sb.sb_bsize; 1009 buf->f_blocks = sc.sc_total; 1010 buf->f_bfree = sc.sc_free; 1011 buf->f_bavail = sc.sc_free; 1012 buf->f_files = sc.sc_dinodes + sc.sc_free; 1013 buf->f_ffree = sc.sc_free; 1014 buf->f_namelen = GFS2_FNAMESIZE; 1015 1016 return 0; 1017 } 1018 1019 /** 1020 * gfs2_drop_inode - Drop an inode (test for remote unlink) 1021 * @inode: The inode to drop 1022 * 1023 * If we've received a callback on an iopen lock then it's because a 1024 * remote node tried to deallocate the inode but failed due to this node 1025 * still having the inode open. Here we mark the link count zero 1026 * since we know that it must have reached zero if the GLF_DEMOTE flag 1027 * is set on the iopen glock. If we didn't do a disk read since the 1028 * remote node removed the final link then we might otherwise miss 1029 * this event. This check ensures that this node will deallocate the 1030 * inode's blocks, or alternatively pass the baton on to another 1031 * node for later deallocation. 1032 */ 1033 1034 static int gfs2_drop_inode(struct inode *inode) 1035 { 1036 struct gfs2_inode *ip = GFS2_I(inode); 1037 1038 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && 1039 inode->i_nlink && 1040 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1041 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1042 if (test_bit(GLF_DEMOTE, &gl->gl_flags)) 1043 clear_nlink(inode); 1044 } 1045 1046 /* 1047 * When under memory pressure when an inode's link count has dropped to 1048 * zero, defer deleting the inode to the delete workqueue. This avoids 1049 * calling into DLM under memory pressure, which can deadlock. 1050 */ 1051 if (!inode->i_nlink && 1052 unlikely(current->flags & PF_MEMALLOC) && 1053 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1054 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1055 1056 gfs2_glock_hold(gl); 1057 if (!gfs2_queue_delete_work(gl, 0)) 1058 gfs2_glock_queue_put(gl); 1059 return false; 1060 } 1061 1062 return generic_drop_inode(inode); 1063 } 1064 1065 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 1066 { 1067 do { 1068 if (d1 == d2) 1069 return 1; 1070 d1 = d1->d_parent; 1071 } while (!IS_ROOT(d1)); 1072 return 0; 1073 } 1074 1075 /** 1076 * gfs2_show_options - Show mount options for /proc/mounts 1077 * @s: seq_file structure 1078 * @root: root of this (sub)tree 1079 * 1080 * Returns: 0 on success or error code 1081 */ 1082 1083 static int gfs2_show_options(struct seq_file *s, struct dentry *root) 1084 { 1085 struct gfs2_sbd *sdp = root->d_sb->s_fs_info; 1086 struct gfs2_args *args = &sdp->sd_args; 1087 int val; 1088 1089 if (is_ancestor(root, sdp->sd_master_dir)) 1090 seq_puts(s, ",meta"); 1091 if (args->ar_lockproto[0]) 1092 seq_show_option(s, "lockproto", args->ar_lockproto); 1093 if (args->ar_locktable[0]) 1094 seq_show_option(s, "locktable", args->ar_locktable); 1095 if (args->ar_hostdata[0]) 1096 seq_show_option(s, "hostdata", args->ar_hostdata); 1097 if (args->ar_spectator) 1098 seq_puts(s, ",spectator"); 1099 if (args->ar_localflocks) 1100 seq_puts(s, ",localflocks"); 1101 if (args->ar_debug) 1102 seq_puts(s, ",debug"); 1103 if (args->ar_posix_acl) 1104 seq_puts(s, ",acl"); 1105 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 1106 char *state; 1107 switch (args->ar_quota) { 1108 case GFS2_QUOTA_OFF: 1109 state = "off"; 1110 break; 1111 case GFS2_QUOTA_ACCOUNT: 1112 state = "account"; 1113 break; 1114 case GFS2_QUOTA_ON: 1115 state = "on"; 1116 break; 1117 default: 1118 state = "unknown"; 1119 break; 1120 } 1121 seq_printf(s, ",quota=%s", state); 1122 } 1123 if (args->ar_suiddir) 1124 seq_puts(s, ",suiddir"); 1125 if (args->ar_data != GFS2_DATA_DEFAULT) { 1126 char *state; 1127 switch (args->ar_data) { 1128 case GFS2_DATA_WRITEBACK: 1129 state = "writeback"; 1130 break; 1131 case GFS2_DATA_ORDERED: 1132 state = "ordered"; 1133 break; 1134 default: 1135 state = "unknown"; 1136 break; 1137 } 1138 seq_printf(s, ",data=%s", state); 1139 } 1140 if (args->ar_discard) 1141 seq_puts(s, ",discard"); 1142 val = sdp->sd_tune.gt_logd_secs; 1143 if (val != 30) 1144 seq_printf(s, ",commit=%d", val); 1145 val = sdp->sd_tune.gt_statfs_quantum; 1146 if (val != 30) 1147 seq_printf(s, ",statfs_quantum=%d", val); 1148 else if (sdp->sd_tune.gt_statfs_slow) 1149 seq_puts(s, ",statfs_quantum=0"); 1150 val = sdp->sd_tune.gt_quota_quantum; 1151 if (val != 60) 1152 seq_printf(s, ",quota_quantum=%d", val); 1153 if (args->ar_statfs_percent) 1154 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1155 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1156 const char *state; 1157 1158 switch (args->ar_errors) { 1159 case GFS2_ERRORS_WITHDRAW: 1160 state = "withdraw"; 1161 break; 1162 case GFS2_ERRORS_PANIC: 1163 state = "panic"; 1164 break; 1165 default: 1166 state = "unknown"; 1167 break; 1168 } 1169 seq_printf(s, ",errors=%s", state); 1170 } 1171 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1172 seq_puts(s, ",nobarrier"); 1173 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1174 seq_puts(s, ",demote_interface_used"); 1175 if (args->ar_rgrplvb) 1176 seq_puts(s, ",rgrplvb"); 1177 if (args->ar_loccookie) 1178 seq_puts(s, ",loccookie"); 1179 return 0; 1180 } 1181 1182 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1183 { 1184 struct inode *inode = &ip->i_inode; 1185 struct gfs2_glock *gl = ip->i_gl; 1186 1187 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1188 truncate_inode_pages(&inode->i_data, 0); 1189 1190 if (atomic_read(&gl->gl_revokes) == 0) { 1191 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1192 clear_bit(GLF_DIRTY, &gl->gl_flags); 1193 } 1194 } 1195 1196 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1197 { 1198 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1199 struct gfs2_rgrpd *rgd; 1200 struct gfs2_holder gh; 1201 int error; 1202 1203 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1204 gfs2_consist_inode(ip); 1205 return -EIO; 1206 } 1207 1208 error = gfs2_rindex_update(sdp); 1209 if (error) 1210 return error; 1211 1212 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 1213 if (error) 1214 return error; 1215 1216 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1217 if (!rgd) { 1218 gfs2_consist_inode(ip); 1219 error = -EIO; 1220 goto out_qs; 1221 } 1222 1223 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh); 1224 if (error) 1225 goto out_qs; 1226 1227 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1228 sdp->sd_jdesc->jd_blocks); 1229 if (error) 1230 goto out_rg_gunlock; 1231 1232 gfs2_free_di(rgd, ip); 1233 1234 gfs2_final_release_pages(ip); 1235 1236 gfs2_trans_end(sdp); 1237 1238 out_rg_gunlock: 1239 gfs2_glock_dq_uninit(&gh); 1240 out_qs: 1241 gfs2_quota_unhold(ip); 1242 return error; 1243 } 1244 1245 /** 1246 * gfs2_glock_put_eventually 1247 * @gl: The glock to put 1248 * 1249 * When under memory pressure, trigger a deferred glock put to make sure we 1250 * won't call into DLM and deadlock. Otherwise, put the glock directly. 1251 */ 1252 1253 static void gfs2_glock_put_eventually(struct gfs2_glock *gl) 1254 { 1255 if (current->flags & PF_MEMALLOC) 1256 gfs2_glock_queue_put(gl); 1257 else 1258 gfs2_glock_put(gl); 1259 } 1260 1261 static bool gfs2_upgrade_iopen_glock(struct inode *inode) 1262 { 1263 struct gfs2_inode *ip = GFS2_I(inode); 1264 struct gfs2_sbd *sdp = GFS2_SB(inode); 1265 struct gfs2_holder *gh = &ip->i_iopen_gh; 1266 long timeout = 5 * HZ; 1267 int error; 1268 1269 gh->gh_flags |= GL_NOCACHE; 1270 gfs2_glock_dq_wait(gh); 1271 1272 /* 1273 * If there are no other lock holders, we'll get the lock immediately. 1274 * Otherwise, the other nodes holding the lock will be notified about 1275 * our locking request. If they don't have the inode open, they'll 1276 * evict the cached inode and release the lock. Otherwise, if they 1277 * poke the inode glock, we'll take this as an indication that they 1278 * still need the iopen glock and that they'll take care of deleting 1279 * the inode when they're done. As a last resort, if another node 1280 * keeps holding the iopen glock without showing any activity on the 1281 * inode glock, we'll eventually time out. 1282 * 1283 * Note that we're passing the LM_FLAG_TRY_1CB flag to the first 1284 * locking request as an optimization to notify lock holders as soon as 1285 * possible. Without that flag, they'd be notified implicitly by the 1286 * second locking request. 1287 */ 1288 1289 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh); 1290 error = gfs2_glock_nq(gh); 1291 if (error != GLR_TRYFAILED) 1292 return !error; 1293 1294 gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh); 1295 error = gfs2_glock_nq(gh); 1296 if (error) 1297 return false; 1298 1299 timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait, 1300 !test_bit(HIF_WAIT, &gh->gh_iflags) || 1301 test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags), 1302 timeout); 1303 if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) { 1304 gfs2_glock_dq(gh); 1305 return false; 1306 } 1307 return true; 1308 } 1309 1310 /** 1311 * gfs2_evict_inode - Remove an inode from cache 1312 * @inode: The inode to evict 1313 * 1314 * There are three cases to consider: 1315 * 1. i_nlink == 0, we are final opener (and must deallocate) 1316 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1317 * 3. i_nlink > 0 1318 * 1319 * If the fs is read only, then we have to treat all cases as per #3 1320 * since we are unable to do any deallocation. The inode will be 1321 * deallocated by the next read/write node to attempt an allocation 1322 * in the same resource group 1323 * 1324 * We have to (at the moment) hold the inodes main lock to cover 1325 * the gap between unlocking the shared lock on the iopen lock and 1326 * taking the exclusive lock. I'd rather do a shared -> exclusive 1327 * conversion on the iopen lock, but we can change that later. This 1328 * is safe, just less efficient. 1329 */ 1330 1331 static void gfs2_evict_inode(struct inode *inode) 1332 { 1333 struct super_block *sb = inode->i_sb; 1334 struct gfs2_sbd *sdp = sb->s_fs_info; 1335 struct gfs2_inode *ip = GFS2_I(inode); 1336 struct gfs2_holder gh; 1337 struct address_space *metamapping; 1338 int error; 1339 1340 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) { 1341 clear_inode(inode); 1342 return; 1343 } 1344 1345 if (inode->i_nlink || sb_rdonly(sb)) 1346 goto out; 1347 1348 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { 1349 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl)); 1350 gfs2_holder_mark_uninitialized(&gh); 1351 goto out_delete; 1352 } 1353 1354 if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags)) 1355 goto out; 1356 1357 /* Deletes should never happen under memory pressure anymore. */ 1358 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC)) 1359 goto out; 1360 1361 /* Must not read inode block until block type has been verified */ 1362 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 1363 if (unlikely(error)) { 1364 glock_clear_object(ip->i_iopen_gh.gh_gl, ip); 1365 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1366 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1367 goto out; 1368 } 1369 1370 if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino)) 1371 goto out_truncate; 1372 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1373 if (error) 1374 goto out_truncate; 1375 1376 if (test_bit(GIF_INVALID, &ip->i_flags)) { 1377 error = gfs2_inode_refresh(ip); 1378 if (error) 1379 goto out_truncate; 1380 } 1381 1382 /* 1383 * The inode may have been recreated in the meantime. 1384 */ 1385 if (inode->i_nlink) 1386 goto out_truncate; 1387 1388 out_delete: 1389 if (gfs2_holder_initialized(&ip->i_iopen_gh) && 1390 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1391 if (!gfs2_upgrade_iopen_glock(inode)) { 1392 gfs2_holder_uninit(&ip->i_iopen_gh); 1393 goto out_truncate; 1394 } 1395 } 1396 1397 if (S_ISDIR(inode->i_mode) && 1398 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1399 error = gfs2_dir_exhash_dealloc(ip); 1400 if (error) 1401 goto out_unlock; 1402 } 1403 1404 if (ip->i_eattr) { 1405 error = gfs2_ea_dealloc(ip); 1406 if (error) 1407 goto out_unlock; 1408 } 1409 1410 if (!gfs2_is_stuffed(ip)) { 1411 error = gfs2_file_dealloc(ip); 1412 if (error) 1413 goto out_unlock; 1414 } 1415 1416 /* We're about to clear the bitmap for the dinode, but as soon as we 1417 do, gfs2_create_inode can create another inode at the same block 1418 location and try to set gl_object again. We clear gl_object here so 1419 that subsequent inode creates don't see an old gl_object. */ 1420 glock_clear_object(ip->i_gl, ip); 1421 error = gfs2_dinode_dealloc(ip); 1422 gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino); 1423 goto out_unlock; 1424 1425 out_truncate: 1426 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 1427 GFS2_LFC_EVICT_INODE); 1428 metamapping = gfs2_glock2aspace(ip->i_gl); 1429 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1430 filemap_fdatawrite(metamapping); 1431 filemap_fdatawait(metamapping); 1432 } 1433 write_inode_now(inode, 1); 1434 gfs2_ail_flush(ip->i_gl, 0); 1435 1436 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1437 if (error) 1438 goto out_unlock; 1439 /* Needs to be done before glock release & also in a transaction */ 1440 truncate_inode_pages(&inode->i_data, 0); 1441 truncate_inode_pages(metamapping, 0); 1442 gfs2_trans_end(sdp); 1443 1444 out_unlock: 1445 if (gfs2_rs_active(&ip->i_res)) 1446 gfs2_rs_deltree(&ip->i_res); 1447 1448 if (gfs2_holder_initialized(&gh)) { 1449 glock_clear_object(ip->i_gl, ip); 1450 gfs2_glock_dq_uninit(&gh); 1451 } 1452 if (error && error != GLR_TRYFAILED && error != -EROFS) 1453 fs_warn(sdp, "gfs2_evict_inode: %d\n", error); 1454 out: 1455 truncate_inode_pages_final(&inode->i_data); 1456 if (ip->i_qadata) 1457 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0); 1458 gfs2_rs_delete(ip, NULL); 1459 gfs2_ordered_del_inode(ip); 1460 clear_inode(inode); 1461 gfs2_dir_hash_inval(ip); 1462 if (ip->i_gl) { 1463 glock_clear_object(ip->i_gl, ip); 1464 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE); 1465 gfs2_glock_add_to_lru(ip->i_gl); 1466 gfs2_glock_put_eventually(ip->i_gl); 1467 ip->i_gl = NULL; 1468 } 1469 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1470 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1471 1472 glock_clear_object(gl, ip); 1473 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1474 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1475 gfs2_glock_dq(&ip->i_iopen_gh); 1476 } 1477 gfs2_glock_hold(gl); 1478 gfs2_holder_uninit(&ip->i_iopen_gh); 1479 gfs2_glock_put_eventually(gl); 1480 } 1481 } 1482 1483 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1484 { 1485 struct gfs2_inode *ip; 1486 1487 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1488 if (!ip) 1489 return NULL; 1490 ip->i_flags = 0; 1491 ip->i_gl = NULL; 1492 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh); 1493 memset(&ip->i_res, 0, sizeof(ip->i_res)); 1494 RB_CLEAR_NODE(&ip->i_res.rs_node); 1495 ip->i_rahead = 0; 1496 return &ip->i_inode; 1497 } 1498 1499 static void gfs2_free_inode(struct inode *inode) 1500 { 1501 kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode)); 1502 } 1503 1504 const struct super_operations gfs2_super_ops = { 1505 .alloc_inode = gfs2_alloc_inode, 1506 .free_inode = gfs2_free_inode, 1507 .write_inode = gfs2_write_inode, 1508 .dirty_inode = gfs2_dirty_inode, 1509 .evict_inode = gfs2_evict_inode, 1510 .put_super = gfs2_put_super, 1511 .sync_fs = gfs2_sync_fs, 1512 .freeze_super = gfs2_freeze, 1513 .thaw_super = gfs2_unfreeze, 1514 .statfs = gfs2_statfs, 1515 .drop_inode = gfs2_drop_inode, 1516 .show_options = gfs2_show_options, 1517 }; 1518 1519