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 gfs2_dump_glock(NULL, ip->i_gl, true); 570 return; 571 } 572 need_unlock = 1; 573 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) 574 return; 575 576 if (current->journal_info == NULL) { 577 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 578 if (ret) { 579 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); 580 goto out; 581 } 582 need_endtrans = 1; 583 } 584 585 ret = gfs2_meta_inode_buffer(ip, &bh); 586 if (ret == 0) { 587 gfs2_trans_add_meta(ip->i_gl, bh); 588 gfs2_dinode_out(ip, bh->b_data); 589 brelse(bh); 590 } 591 592 if (need_endtrans) 593 gfs2_trans_end(sdp); 594 out: 595 if (need_unlock) 596 gfs2_glock_dq_uninit(&gh); 597 } 598 599 /** 600 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 601 * @sdp: the filesystem 602 * 603 * Returns: errno 604 */ 605 606 int gfs2_make_fs_ro(struct gfs2_sbd *sdp) 607 { 608 struct gfs2_holder freeze_gh; 609 int error = 0; 610 int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 611 612 gfs2_holder_mark_uninitialized(&freeze_gh); 613 if (sdp->sd_freeze_gl && 614 !gfs2_glock_is_locked_by_me(sdp->sd_freeze_gl)) { 615 if (!log_write_allowed) { 616 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, 617 LM_ST_SHARED, LM_FLAG_TRY | 618 LM_FLAG_NOEXP | GL_EXACT, 619 &freeze_gh); 620 if (error == GLR_TRYFAILED) 621 error = 0; 622 } else { 623 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, 624 LM_ST_SHARED, 625 LM_FLAG_NOEXP | GL_EXACT, 626 &freeze_gh); 627 if (error && !gfs2_withdrawn(sdp)) 628 return error; 629 } 630 } 631 632 gfs2_flush_delete_work(sdp); 633 if (!log_write_allowed && current == sdp->sd_quotad_process) 634 fs_warn(sdp, "The quotad daemon is withdrawing.\n"); 635 else if (sdp->sd_quotad_process) 636 kthread_stop(sdp->sd_quotad_process); 637 sdp->sd_quotad_process = NULL; 638 639 if (!log_write_allowed && current == sdp->sd_logd_process) 640 fs_warn(sdp, "The logd daemon is withdrawing.\n"); 641 else if (sdp->sd_logd_process) 642 kthread_stop(sdp->sd_logd_process); 643 sdp->sd_logd_process = NULL; 644 645 if (log_write_allowed) { 646 gfs2_quota_sync(sdp->sd_vfs, 0); 647 gfs2_statfs_sync(sdp->sd_vfs, 0); 648 649 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN | 650 GFS2_LFC_MAKE_FS_RO); 651 wait_event(sdp->sd_reserving_log_wait, 652 atomic_read(&sdp->sd_reserving_log) == 0); 653 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == 654 sdp->sd_jdesc->jd_blocks); 655 } else { 656 wait_event_timeout(sdp->sd_reserving_log_wait, 657 atomic_read(&sdp->sd_reserving_log) == 0, 658 HZ * 5); 659 } 660 if (gfs2_holder_initialized(&freeze_gh)) 661 gfs2_glock_dq_uninit(&freeze_gh); 662 663 gfs2_quota_cleanup(sdp); 664 665 if (!log_write_allowed) 666 sdp->sd_vfs->s_flags |= SB_RDONLY; 667 668 return error; 669 } 670 671 /** 672 * gfs2_put_super - Unmount the filesystem 673 * @sb: The VFS superblock 674 * 675 */ 676 677 static void gfs2_put_super(struct super_block *sb) 678 { 679 struct gfs2_sbd *sdp = sb->s_fs_info; 680 int error; 681 struct gfs2_jdesc *jd; 682 683 /* No more recovery requests */ 684 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 685 smp_mb(); 686 687 /* Wait on outstanding recovery */ 688 restart: 689 spin_lock(&sdp->sd_jindex_spin); 690 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 691 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 692 continue; 693 spin_unlock(&sdp->sd_jindex_spin); 694 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 695 TASK_UNINTERRUPTIBLE); 696 goto restart; 697 } 698 spin_unlock(&sdp->sd_jindex_spin); 699 700 if (!sb_rdonly(sb)) { 701 error = gfs2_make_fs_ro(sdp); 702 if (error) 703 gfs2_io_error(sdp); 704 } 705 /* At this point, we're through modifying the disk */ 706 707 /* Release stuff */ 708 709 iput(sdp->sd_jindex); 710 iput(sdp->sd_statfs_inode); 711 iput(sdp->sd_rindex); 712 iput(sdp->sd_quota_inode); 713 714 gfs2_glock_put(sdp->sd_rename_gl); 715 gfs2_glock_put(sdp->sd_freeze_gl); 716 717 if (!sdp->sd_args.ar_spectator) { 718 if (gfs2_holder_initialized(&sdp->sd_journal_gh)) 719 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 720 if (gfs2_holder_initialized(&sdp->sd_jinode_gh)) 721 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 722 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 723 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 724 iput(sdp->sd_sc_inode); 725 iput(sdp->sd_qc_inode); 726 } 727 728 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 729 gfs2_clear_rgrpd(sdp); 730 gfs2_jindex_free(sdp); 731 /* Take apart glock structures and buffer lists */ 732 gfs2_gl_hash_clear(sdp); 733 gfs2_delete_debugfs_file(sdp); 734 /* Unmount the locking protocol */ 735 gfs2_lm_unmount(sdp); 736 737 /* At this point, we're through participating in the lockspace */ 738 gfs2_sys_fs_del(sdp); 739 } 740 741 /** 742 * gfs2_sync_fs - sync the filesystem 743 * @sb: the superblock 744 * 745 * Flushes the log to disk. 746 */ 747 748 static int gfs2_sync_fs(struct super_block *sb, int wait) 749 { 750 struct gfs2_sbd *sdp = sb->s_fs_info; 751 752 gfs2_quota_sync(sb, -1); 753 if (wait) 754 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 755 GFS2_LFC_SYNC_FS); 756 return sdp->sd_log_error; 757 } 758 759 void gfs2_freeze_func(struct work_struct *work) 760 { 761 int error; 762 struct gfs2_holder freeze_gh; 763 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work); 764 struct super_block *sb = sdp->sd_vfs; 765 766 atomic_inc(&sb->s_active); 767 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 768 LM_FLAG_NOEXP | GL_EXACT, &freeze_gh); 769 if (error) { 770 fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error); 771 gfs2_assert_withdraw(sdp, 0); 772 } else { 773 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 774 error = thaw_super(sb); 775 if (error) { 776 fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n", 777 error); 778 gfs2_assert_withdraw(sdp, 0); 779 } 780 gfs2_glock_dq_uninit(&freeze_gh); 781 } 782 deactivate_super(sb); 783 clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags); 784 wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN); 785 return; 786 } 787 788 /** 789 * gfs2_freeze - prevent further writes to the filesystem 790 * @sb: the VFS structure for the filesystem 791 * 792 */ 793 794 static int gfs2_freeze(struct super_block *sb) 795 { 796 struct gfs2_sbd *sdp = sb->s_fs_info; 797 int error = 0; 798 799 mutex_lock(&sdp->sd_freeze_mutex); 800 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) 801 goto out; 802 803 for (;;) { 804 if (gfs2_withdrawn(sdp)) { 805 error = -EINVAL; 806 goto out; 807 } 808 809 error = gfs2_lock_fs_check_clean(sdp); 810 if (!error) 811 break; 812 813 if (error == -EBUSY) 814 fs_err(sdp, "waiting for recovery before freeze\n"); 815 else if (error == -EIO) { 816 fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due " 817 "to recovery error.\n"); 818 goto out; 819 } else { 820 fs_err(sdp, "error freezing FS: %d\n", error); 821 } 822 fs_err(sdp, "retrying...\n"); 823 msleep(1000); 824 } 825 set_bit(SDF_FS_FROZEN, &sdp->sd_flags); 826 out: 827 mutex_unlock(&sdp->sd_freeze_mutex); 828 return error; 829 } 830 831 /** 832 * gfs2_unfreeze - reallow writes to the filesystem 833 * @sb: the VFS structure for the filesystem 834 * 835 */ 836 837 static int gfs2_unfreeze(struct super_block *sb) 838 { 839 struct gfs2_sbd *sdp = sb->s_fs_info; 840 841 mutex_lock(&sdp->sd_freeze_mutex); 842 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN || 843 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) { 844 mutex_unlock(&sdp->sd_freeze_mutex); 845 return 0; 846 } 847 848 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); 849 mutex_unlock(&sdp->sd_freeze_mutex); 850 return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE); 851 } 852 853 /** 854 * statfs_fill - fill in the sg for a given RG 855 * @rgd: the RG 856 * @sc: the sc structure 857 * 858 * Returns: 0 on success, -ESTALE if the LVB is invalid 859 */ 860 861 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 862 struct gfs2_statfs_change_host *sc) 863 { 864 gfs2_rgrp_verify(rgd); 865 sc->sc_total += rgd->rd_data; 866 sc->sc_free += rgd->rd_free; 867 sc->sc_dinodes += rgd->rd_dinodes; 868 return 0; 869 } 870 871 /** 872 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 873 * @sdp: the filesystem 874 * @sc: the sc info that will be returned 875 * 876 * Any error (other than a signal) will cause this routine to fall back 877 * to the synchronous version. 878 * 879 * FIXME: This really shouldn't busy wait like this. 880 * 881 * Returns: errno 882 */ 883 884 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 885 { 886 struct gfs2_rgrpd *rgd_next; 887 struct gfs2_holder *gha, *gh; 888 unsigned int slots = 64; 889 unsigned int x; 890 int done; 891 int error = 0, err; 892 893 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 894 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 895 if (!gha) 896 return -ENOMEM; 897 for (x = 0; x < slots; x++) 898 gfs2_holder_mark_uninitialized(gha + x); 899 900 rgd_next = gfs2_rgrpd_get_first(sdp); 901 902 for (;;) { 903 done = 1; 904 905 for (x = 0; x < slots; x++) { 906 gh = gha + x; 907 908 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) { 909 err = gfs2_glock_wait(gh); 910 if (err) { 911 gfs2_holder_uninit(gh); 912 error = err; 913 } else { 914 if (!error) { 915 struct gfs2_rgrpd *rgd = 916 gfs2_glock2rgrp(gh->gh_gl); 917 918 error = statfs_slow_fill(rgd, sc); 919 } 920 gfs2_glock_dq_uninit(gh); 921 } 922 } 923 924 if (gfs2_holder_initialized(gh)) 925 done = 0; 926 else if (rgd_next && !error) { 927 error = gfs2_glock_nq_init(rgd_next->rd_gl, 928 LM_ST_SHARED, 929 GL_ASYNC, 930 gh); 931 rgd_next = gfs2_rgrpd_get_next(rgd_next); 932 done = 0; 933 } 934 935 if (signal_pending(current)) 936 error = -ERESTARTSYS; 937 } 938 939 if (done) 940 break; 941 942 yield(); 943 } 944 945 kfree(gha); 946 return error; 947 } 948 949 /** 950 * gfs2_statfs_i - Do a statfs 951 * @sdp: the filesystem 952 * @sg: the sg structure 953 * 954 * Returns: errno 955 */ 956 957 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 958 { 959 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 960 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 961 962 spin_lock(&sdp->sd_statfs_spin); 963 964 *sc = *m_sc; 965 sc->sc_total += l_sc->sc_total; 966 sc->sc_free += l_sc->sc_free; 967 sc->sc_dinodes += l_sc->sc_dinodes; 968 969 spin_unlock(&sdp->sd_statfs_spin); 970 971 if (sc->sc_free < 0) 972 sc->sc_free = 0; 973 if (sc->sc_free > sc->sc_total) 974 sc->sc_free = sc->sc_total; 975 if (sc->sc_dinodes < 0) 976 sc->sc_dinodes = 0; 977 978 return 0; 979 } 980 981 /** 982 * gfs2_statfs - Gather and return stats about the filesystem 983 * @sb: The superblock 984 * @statfsbuf: The buffer 985 * 986 * Returns: 0 on success or error code 987 */ 988 989 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 990 { 991 struct super_block *sb = dentry->d_sb; 992 struct gfs2_sbd *sdp = sb->s_fs_info; 993 struct gfs2_statfs_change_host sc; 994 int error; 995 996 error = gfs2_rindex_update(sdp); 997 if (error) 998 return error; 999 1000 if (gfs2_tune_get(sdp, gt_statfs_slow)) 1001 error = gfs2_statfs_slow(sdp, &sc); 1002 else 1003 error = gfs2_statfs_i(sdp, &sc); 1004 1005 if (error) 1006 return error; 1007 1008 buf->f_type = GFS2_MAGIC; 1009 buf->f_bsize = sdp->sd_sb.sb_bsize; 1010 buf->f_blocks = sc.sc_total; 1011 buf->f_bfree = sc.sc_free; 1012 buf->f_bavail = sc.sc_free; 1013 buf->f_files = sc.sc_dinodes + sc.sc_free; 1014 buf->f_ffree = sc.sc_free; 1015 buf->f_namelen = GFS2_FNAMESIZE; 1016 1017 return 0; 1018 } 1019 1020 /** 1021 * gfs2_drop_inode - Drop an inode (test for remote unlink) 1022 * @inode: The inode to drop 1023 * 1024 * If we've received a callback on an iopen lock then it's because a 1025 * remote node tried to deallocate the inode but failed due to this node 1026 * still having the inode open. Here we mark the link count zero 1027 * since we know that it must have reached zero if the GLF_DEMOTE flag 1028 * is set on the iopen glock. If we didn't do a disk read since the 1029 * remote node removed the final link then we might otherwise miss 1030 * this event. This check ensures that this node will deallocate the 1031 * inode's blocks, or alternatively pass the baton on to another 1032 * node for later deallocation. 1033 */ 1034 1035 static int gfs2_drop_inode(struct inode *inode) 1036 { 1037 struct gfs2_inode *ip = GFS2_I(inode); 1038 1039 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && 1040 inode->i_nlink && 1041 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1042 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1043 if (test_bit(GLF_DEMOTE, &gl->gl_flags)) 1044 clear_nlink(inode); 1045 } 1046 1047 /* 1048 * When under memory pressure when an inode's link count has dropped to 1049 * zero, defer deleting the inode to the delete workqueue. This avoids 1050 * calling into DLM under memory pressure, which can deadlock. 1051 */ 1052 if (!inode->i_nlink && 1053 unlikely(current->flags & PF_MEMALLOC) && 1054 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1055 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1056 1057 gfs2_glock_hold(gl); 1058 if (!gfs2_queue_delete_work(gl, 0)) 1059 gfs2_glock_queue_put(gl); 1060 return false; 1061 } 1062 1063 return generic_drop_inode(inode); 1064 } 1065 1066 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 1067 { 1068 do { 1069 if (d1 == d2) 1070 return 1; 1071 d1 = d1->d_parent; 1072 } while (!IS_ROOT(d1)); 1073 return 0; 1074 } 1075 1076 /** 1077 * gfs2_show_options - Show mount options for /proc/mounts 1078 * @s: seq_file structure 1079 * @root: root of this (sub)tree 1080 * 1081 * Returns: 0 on success or error code 1082 */ 1083 1084 static int gfs2_show_options(struct seq_file *s, struct dentry *root) 1085 { 1086 struct gfs2_sbd *sdp = root->d_sb->s_fs_info; 1087 struct gfs2_args *args = &sdp->sd_args; 1088 int val; 1089 1090 if (is_ancestor(root, sdp->sd_master_dir)) 1091 seq_puts(s, ",meta"); 1092 if (args->ar_lockproto[0]) 1093 seq_show_option(s, "lockproto", args->ar_lockproto); 1094 if (args->ar_locktable[0]) 1095 seq_show_option(s, "locktable", args->ar_locktable); 1096 if (args->ar_hostdata[0]) 1097 seq_show_option(s, "hostdata", args->ar_hostdata); 1098 if (args->ar_spectator) 1099 seq_puts(s, ",spectator"); 1100 if (args->ar_localflocks) 1101 seq_puts(s, ",localflocks"); 1102 if (args->ar_debug) 1103 seq_puts(s, ",debug"); 1104 if (args->ar_posix_acl) 1105 seq_puts(s, ",acl"); 1106 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 1107 char *state; 1108 switch (args->ar_quota) { 1109 case GFS2_QUOTA_OFF: 1110 state = "off"; 1111 break; 1112 case GFS2_QUOTA_ACCOUNT: 1113 state = "account"; 1114 break; 1115 case GFS2_QUOTA_ON: 1116 state = "on"; 1117 break; 1118 default: 1119 state = "unknown"; 1120 break; 1121 } 1122 seq_printf(s, ",quota=%s", state); 1123 } 1124 if (args->ar_suiddir) 1125 seq_puts(s, ",suiddir"); 1126 if (args->ar_data != GFS2_DATA_DEFAULT) { 1127 char *state; 1128 switch (args->ar_data) { 1129 case GFS2_DATA_WRITEBACK: 1130 state = "writeback"; 1131 break; 1132 case GFS2_DATA_ORDERED: 1133 state = "ordered"; 1134 break; 1135 default: 1136 state = "unknown"; 1137 break; 1138 } 1139 seq_printf(s, ",data=%s", state); 1140 } 1141 if (args->ar_discard) 1142 seq_puts(s, ",discard"); 1143 val = sdp->sd_tune.gt_logd_secs; 1144 if (val != 30) 1145 seq_printf(s, ",commit=%d", val); 1146 val = sdp->sd_tune.gt_statfs_quantum; 1147 if (val != 30) 1148 seq_printf(s, ",statfs_quantum=%d", val); 1149 else if (sdp->sd_tune.gt_statfs_slow) 1150 seq_puts(s, ",statfs_quantum=0"); 1151 val = sdp->sd_tune.gt_quota_quantum; 1152 if (val != 60) 1153 seq_printf(s, ",quota_quantum=%d", val); 1154 if (args->ar_statfs_percent) 1155 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1156 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1157 const char *state; 1158 1159 switch (args->ar_errors) { 1160 case GFS2_ERRORS_WITHDRAW: 1161 state = "withdraw"; 1162 break; 1163 case GFS2_ERRORS_PANIC: 1164 state = "panic"; 1165 break; 1166 default: 1167 state = "unknown"; 1168 break; 1169 } 1170 seq_printf(s, ",errors=%s", state); 1171 } 1172 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1173 seq_puts(s, ",nobarrier"); 1174 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1175 seq_puts(s, ",demote_interface_used"); 1176 if (args->ar_rgrplvb) 1177 seq_puts(s, ",rgrplvb"); 1178 if (args->ar_loccookie) 1179 seq_puts(s, ",loccookie"); 1180 return 0; 1181 } 1182 1183 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1184 { 1185 struct inode *inode = &ip->i_inode; 1186 struct gfs2_glock *gl = ip->i_gl; 1187 1188 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1189 truncate_inode_pages(&inode->i_data, 0); 1190 1191 if (atomic_read(&gl->gl_revokes) == 0) { 1192 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1193 clear_bit(GLF_DIRTY, &gl->gl_flags); 1194 } 1195 } 1196 1197 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1198 { 1199 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1200 struct gfs2_rgrpd *rgd; 1201 struct gfs2_holder gh; 1202 int error; 1203 1204 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1205 gfs2_consist_inode(ip); 1206 return -EIO; 1207 } 1208 1209 error = gfs2_rindex_update(sdp); 1210 if (error) 1211 return error; 1212 1213 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 1214 if (error) 1215 return error; 1216 1217 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1218 if (!rgd) { 1219 gfs2_consist_inode(ip); 1220 error = -EIO; 1221 goto out_qs; 1222 } 1223 1224 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh); 1225 if (error) 1226 goto out_qs; 1227 1228 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1229 sdp->sd_jdesc->jd_blocks); 1230 if (error) 1231 goto out_rg_gunlock; 1232 1233 gfs2_free_di(rgd, ip); 1234 1235 gfs2_final_release_pages(ip); 1236 1237 gfs2_trans_end(sdp); 1238 1239 out_rg_gunlock: 1240 gfs2_glock_dq_uninit(&gh); 1241 out_qs: 1242 gfs2_quota_unhold(ip); 1243 return error; 1244 } 1245 1246 /** 1247 * gfs2_glock_put_eventually 1248 * @gl: The glock to put 1249 * 1250 * When under memory pressure, trigger a deferred glock put to make sure we 1251 * won't call into DLM and deadlock. Otherwise, put the glock directly. 1252 */ 1253 1254 static void gfs2_glock_put_eventually(struct gfs2_glock *gl) 1255 { 1256 if (current->flags & PF_MEMALLOC) 1257 gfs2_glock_queue_put(gl); 1258 else 1259 gfs2_glock_put(gl); 1260 } 1261 1262 static bool gfs2_upgrade_iopen_glock(struct inode *inode) 1263 { 1264 struct gfs2_inode *ip = GFS2_I(inode); 1265 struct gfs2_sbd *sdp = GFS2_SB(inode); 1266 struct gfs2_holder *gh = &ip->i_iopen_gh; 1267 long timeout = 5 * HZ; 1268 int error; 1269 1270 gh->gh_flags |= GL_NOCACHE; 1271 gfs2_glock_dq_wait(gh); 1272 1273 /* 1274 * If there are no other lock holders, we'll get the lock immediately. 1275 * Otherwise, the other nodes holding the lock will be notified about 1276 * our locking request. If they don't have the inode open, they'll 1277 * evict the cached inode and release the lock. Otherwise, if they 1278 * poke the inode glock, we'll take this as an indication that they 1279 * still need the iopen glock and that they'll take care of deleting 1280 * the inode when they're done. As a last resort, if another node 1281 * keeps holding the iopen glock without showing any activity on the 1282 * inode glock, we'll eventually time out. 1283 * 1284 * Note that we're passing the LM_FLAG_TRY_1CB flag to the first 1285 * locking request as an optimization to notify lock holders as soon as 1286 * possible. Without that flag, they'd be notified implicitly by the 1287 * second locking request. 1288 */ 1289 1290 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh); 1291 error = gfs2_glock_nq(gh); 1292 if (error != GLR_TRYFAILED) 1293 return !error; 1294 1295 gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh); 1296 error = gfs2_glock_nq(gh); 1297 if (error) 1298 return false; 1299 1300 timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait, 1301 !test_bit(HIF_WAIT, &gh->gh_iflags) || 1302 test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags), 1303 timeout); 1304 if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) { 1305 gfs2_glock_dq(gh); 1306 return false; 1307 } 1308 return true; 1309 } 1310 1311 /** 1312 * gfs2_evict_inode - Remove an inode from cache 1313 * @inode: The inode to evict 1314 * 1315 * There are three cases to consider: 1316 * 1. i_nlink == 0, we are final opener (and must deallocate) 1317 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1318 * 3. i_nlink > 0 1319 * 1320 * If the fs is read only, then we have to treat all cases as per #3 1321 * since we are unable to do any deallocation. The inode will be 1322 * deallocated by the next read/write node to attempt an allocation 1323 * in the same resource group 1324 * 1325 * We have to (at the moment) hold the inodes main lock to cover 1326 * the gap between unlocking the shared lock on the iopen lock and 1327 * taking the exclusive lock. I'd rather do a shared -> exclusive 1328 * conversion on the iopen lock, but we can change that later. This 1329 * is safe, just less efficient. 1330 */ 1331 1332 static void gfs2_evict_inode(struct inode *inode) 1333 { 1334 struct super_block *sb = inode->i_sb; 1335 struct gfs2_sbd *sdp = sb->s_fs_info; 1336 struct gfs2_inode *ip = GFS2_I(inode); 1337 struct gfs2_holder gh; 1338 struct address_space *metamapping; 1339 int error; 1340 1341 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) { 1342 clear_inode(inode); 1343 return; 1344 } 1345 1346 if (inode->i_nlink || sb_rdonly(sb)) 1347 goto out; 1348 1349 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { 1350 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl)); 1351 gfs2_holder_mark_uninitialized(&gh); 1352 goto out_delete; 1353 } 1354 1355 if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags)) 1356 goto out; 1357 1358 /* Deletes should never happen under memory pressure anymore. */ 1359 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC)) 1360 goto out; 1361 1362 /* Must not read inode block until block type has been verified */ 1363 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh); 1364 if (unlikely(error)) { 1365 glock_clear_object(ip->i_iopen_gh.gh_gl, ip); 1366 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1367 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1368 goto out; 1369 } 1370 1371 if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino)) 1372 goto out_truncate; 1373 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1374 if (error) 1375 goto out_truncate; 1376 1377 if (test_bit(GIF_INVALID, &ip->i_flags)) { 1378 error = gfs2_inode_refresh(ip); 1379 if (error) 1380 goto out_truncate; 1381 } 1382 1383 /* 1384 * The inode may have been recreated in the meantime. 1385 */ 1386 if (inode->i_nlink) 1387 goto out_truncate; 1388 1389 out_delete: 1390 if (gfs2_holder_initialized(&ip->i_iopen_gh) && 1391 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1392 if (!gfs2_upgrade_iopen_glock(inode)) { 1393 gfs2_holder_uninit(&ip->i_iopen_gh); 1394 goto out_truncate; 1395 } 1396 } 1397 1398 if (S_ISDIR(inode->i_mode) && 1399 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1400 error = gfs2_dir_exhash_dealloc(ip); 1401 if (error) 1402 goto out_unlock; 1403 } 1404 1405 if (ip->i_eattr) { 1406 error = gfs2_ea_dealloc(ip); 1407 if (error) 1408 goto out_unlock; 1409 } 1410 1411 if (!gfs2_is_stuffed(ip)) { 1412 error = gfs2_file_dealloc(ip); 1413 if (error) 1414 goto out_unlock; 1415 } 1416 1417 /* We're about to clear the bitmap for the dinode, but as soon as we 1418 do, gfs2_create_inode can create another inode at the same block 1419 location and try to set gl_object again. We clear gl_object here so 1420 that subsequent inode creates don't see an old gl_object. */ 1421 glock_clear_object(ip->i_gl, ip); 1422 error = gfs2_dinode_dealloc(ip); 1423 gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino); 1424 goto out_unlock; 1425 1426 out_truncate: 1427 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 1428 GFS2_LFC_EVICT_INODE); 1429 metamapping = gfs2_glock2aspace(ip->i_gl); 1430 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1431 filemap_fdatawrite(metamapping); 1432 filemap_fdatawait(metamapping); 1433 } 1434 write_inode_now(inode, 1); 1435 gfs2_ail_flush(ip->i_gl, 0); 1436 1437 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1438 if (error) 1439 goto out_unlock; 1440 /* Needs to be done before glock release & also in a transaction */ 1441 truncate_inode_pages(&inode->i_data, 0); 1442 truncate_inode_pages(metamapping, 0); 1443 gfs2_trans_end(sdp); 1444 1445 out_unlock: 1446 if (gfs2_rs_active(&ip->i_res)) 1447 gfs2_rs_deltree(&ip->i_res); 1448 1449 if (gfs2_holder_initialized(&gh)) { 1450 glock_clear_object(ip->i_gl, ip); 1451 gfs2_glock_dq_uninit(&gh); 1452 } 1453 if (error && error != GLR_TRYFAILED && error != -EROFS) 1454 fs_warn(sdp, "gfs2_evict_inode: %d\n", error); 1455 out: 1456 truncate_inode_pages_final(&inode->i_data); 1457 if (ip->i_qadata) 1458 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0); 1459 gfs2_rs_delete(ip, NULL); 1460 gfs2_ordered_del_inode(ip); 1461 clear_inode(inode); 1462 gfs2_dir_hash_inval(ip); 1463 if (ip->i_gl) { 1464 glock_clear_object(ip->i_gl, ip); 1465 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE); 1466 gfs2_glock_add_to_lru(ip->i_gl); 1467 gfs2_glock_put_eventually(ip->i_gl); 1468 ip->i_gl = NULL; 1469 } 1470 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1471 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1472 1473 glock_clear_object(gl, ip); 1474 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1475 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1476 gfs2_glock_dq(&ip->i_iopen_gh); 1477 } 1478 gfs2_glock_hold(gl); 1479 gfs2_holder_uninit(&ip->i_iopen_gh); 1480 gfs2_glock_put_eventually(gl); 1481 } 1482 } 1483 1484 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1485 { 1486 struct gfs2_inode *ip; 1487 1488 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1489 if (!ip) 1490 return NULL; 1491 ip->i_flags = 0; 1492 ip->i_gl = NULL; 1493 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh); 1494 memset(&ip->i_res, 0, sizeof(ip->i_res)); 1495 RB_CLEAR_NODE(&ip->i_res.rs_node); 1496 ip->i_rahead = 0; 1497 return &ip->i_inode; 1498 } 1499 1500 static void gfs2_free_inode(struct inode *inode) 1501 { 1502 kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode)); 1503 } 1504 1505 const struct super_operations gfs2_super_ops = { 1506 .alloc_inode = gfs2_alloc_inode, 1507 .free_inode = gfs2_free_inode, 1508 .write_inode = gfs2_write_inode, 1509 .dirty_inode = gfs2_dirty_inode, 1510 .evict_inode = gfs2_evict_inode, 1511 .put_super = gfs2_put_super, 1512 .sync_fs = gfs2_sync_fs, 1513 .freeze_super = gfs2_freeze, 1514 .thaw_super = gfs2_unfreeze, 1515 .statfs = gfs2_statfs, 1516 .drop_inode = gfs2_drop_inode, 1517 .show_options = gfs2_show_options, 1518 }; 1519 1520