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 enum dinode_demise { 48 SHOULD_DELETE_DINODE, 49 SHOULD_NOT_DELETE_DINODE, 50 SHOULD_DEFER_EVICTION, 51 }; 52 53 /** 54 * gfs2_jindex_free - Clear all the journal index information 55 * @sdp: The GFS2 superblock 56 * 57 */ 58 59 void gfs2_jindex_free(struct gfs2_sbd *sdp) 60 { 61 struct list_head list; 62 struct gfs2_jdesc *jd; 63 64 spin_lock(&sdp->sd_jindex_spin); 65 list_add(&list, &sdp->sd_jindex_list); 66 list_del_init(&sdp->sd_jindex_list); 67 sdp->sd_journals = 0; 68 spin_unlock(&sdp->sd_jindex_spin); 69 70 sdp->sd_jdesc = NULL; 71 while (!list_empty(&list)) { 72 jd = list_first_entry(&list, struct gfs2_jdesc, jd_list); 73 gfs2_free_journal_extents(jd); 74 list_del(&jd->jd_list); 75 iput(jd->jd_inode); 76 jd->jd_inode = NULL; 77 kfree(jd); 78 } 79 } 80 81 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) 82 { 83 struct gfs2_jdesc *jd; 84 85 list_for_each_entry(jd, head, jd_list) { 86 if (jd->jd_jid == jid) 87 return jd; 88 } 89 return NULL; 90 } 91 92 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) 93 { 94 struct gfs2_jdesc *jd; 95 96 spin_lock(&sdp->sd_jindex_spin); 97 jd = jdesc_find_i(&sdp->sd_jindex_list, jid); 98 spin_unlock(&sdp->sd_jindex_spin); 99 100 return jd; 101 } 102 103 int gfs2_jdesc_check(struct gfs2_jdesc *jd) 104 { 105 struct gfs2_inode *ip = GFS2_I(jd->jd_inode); 106 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); 107 u64 size = i_size_read(jd->jd_inode); 108 109 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30))) 110 return -EIO; 111 112 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift; 113 114 if (gfs2_write_alloc_required(ip, 0, size)) { 115 gfs2_consist_inode(ip); 116 return -EIO; 117 } 118 119 return 0; 120 } 121 122 static int init_threads(struct gfs2_sbd *sdp) 123 { 124 struct task_struct *p; 125 int error = 0; 126 127 p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); 128 if (IS_ERR(p)) { 129 error = PTR_ERR(p); 130 fs_err(sdp, "can't start logd thread: %d\n", error); 131 return error; 132 } 133 sdp->sd_logd_process = p; 134 135 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); 136 if (IS_ERR(p)) { 137 error = PTR_ERR(p); 138 fs_err(sdp, "can't start quotad thread: %d\n", error); 139 goto fail; 140 } 141 sdp->sd_quotad_process = p; 142 return 0; 143 144 fail: 145 kthread_stop(sdp->sd_logd_process); 146 sdp->sd_logd_process = NULL; 147 return error; 148 } 149 150 /** 151 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one 152 * @sdp: the filesystem 153 * 154 * Returns: errno 155 */ 156 157 int gfs2_make_fs_rw(struct gfs2_sbd *sdp) 158 { 159 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 160 struct gfs2_glock *j_gl = ip->i_gl; 161 struct gfs2_log_header_host head; 162 int error; 163 164 error = init_threads(sdp); 165 if (error) 166 return error; 167 168 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 169 if (gfs2_withdrawn(sdp)) { 170 error = -EIO; 171 goto fail; 172 } 173 174 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false); 175 if (error || gfs2_withdrawn(sdp)) 176 goto fail; 177 178 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 179 gfs2_consist(sdp); 180 error = -EIO; 181 goto fail; 182 } 183 184 /* Initialize some head of the log stuff */ 185 sdp->sd_log_sequence = head.lh_sequence + 1; 186 gfs2_log_pointers_init(sdp, head.lh_blkno); 187 188 error = gfs2_quota_init(sdp); 189 if (error || gfs2_withdrawn(sdp)) 190 goto fail; 191 192 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 193 194 return 0; 195 196 fail: 197 if (sdp->sd_quotad_process) 198 kthread_stop(sdp->sd_quotad_process); 199 sdp->sd_quotad_process = NULL; 200 if (sdp->sd_logd_process) 201 kthread_stop(sdp->sd_logd_process); 202 sdp->sd_logd_process = NULL; 203 return error; 204 } 205 206 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) 207 { 208 const struct gfs2_statfs_change *str = buf; 209 210 sc->sc_total = be64_to_cpu(str->sc_total); 211 sc->sc_free = be64_to_cpu(str->sc_free); 212 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); 213 } 214 215 void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) 216 { 217 struct gfs2_statfs_change *str = buf; 218 219 str->sc_total = cpu_to_be64(sc->sc_total); 220 str->sc_free = cpu_to_be64(sc->sc_free); 221 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); 222 } 223 224 int gfs2_statfs_init(struct gfs2_sbd *sdp) 225 { 226 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 227 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 228 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 229 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 230 struct buffer_head *m_bh, *l_bh; 231 struct gfs2_holder gh; 232 int error; 233 234 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 235 &gh); 236 if (error) 237 return error; 238 239 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 240 if (error) 241 goto out; 242 243 if (sdp->sd_args.ar_spectator) { 244 spin_lock(&sdp->sd_statfs_spin); 245 gfs2_statfs_change_in(m_sc, m_bh->b_data + 246 sizeof(struct gfs2_dinode)); 247 spin_unlock(&sdp->sd_statfs_spin); 248 } else { 249 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 250 if (error) 251 goto out_m_bh; 252 253 spin_lock(&sdp->sd_statfs_spin); 254 gfs2_statfs_change_in(m_sc, m_bh->b_data + 255 sizeof(struct gfs2_dinode)); 256 gfs2_statfs_change_in(l_sc, l_bh->b_data + 257 sizeof(struct gfs2_dinode)); 258 spin_unlock(&sdp->sd_statfs_spin); 259 260 brelse(l_bh); 261 } 262 263 out_m_bh: 264 brelse(m_bh); 265 out: 266 gfs2_glock_dq_uninit(&gh); 267 return 0; 268 } 269 270 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, 271 s64 dinodes) 272 { 273 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 274 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 275 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 276 struct buffer_head *l_bh; 277 s64 x, y; 278 int need_sync = 0; 279 int error; 280 281 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 282 if (error) 283 return; 284 285 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 286 287 spin_lock(&sdp->sd_statfs_spin); 288 l_sc->sc_total += total; 289 l_sc->sc_free += free; 290 l_sc->sc_dinodes += dinodes; 291 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); 292 if (sdp->sd_args.ar_statfs_percent) { 293 x = 100 * l_sc->sc_free; 294 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent; 295 if (x >= y || x <= -y) 296 need_sync = 1; 297 } 298 spin_unlock(&sdp->sd_statfs_spin); 299 300 brelse(l_bh); 301 if (need_sync) 302 gfs2_wake_up_statfs(sdp); 303 } 304 305 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh, 306 struct buffer_head *l_bh) 307 { 308 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 309 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 310 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 311 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 312 313 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 314 gfs2_trans_add_meta(m_ip->i_gl, m_bh); 315 316 spin_lock(&sdp->sd_statfs_spin); 317 m_sc->sc_total += l_sc->sc_total; 318 m_sc->sc_free += l_sc->sc_free; 319 m_sc->sc_dinodes += l_sc->sc_dinodes; 320 memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); 321 memset(l_bh->b_data + sizeof(struct gfs2_dinode), 322 0, sizeof(struct gfs2_statfs_change)); 323 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); 324 spin_unlock(&sdp->sd_statfs_spin); 325 } 326 327 int gfs2_statfs_sync(struct super_block *sb, int type) 328 { 329 struct gfs2_sbd *sdp = sb->s_fs_info; 330 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 331 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 332 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 333 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 334 struct gfs2_holder gh; 335 struct buffer_head *m_bh, *l_bh; 336 int error; 337 338 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 339 &gh); 340 if (error) 341 goto out; 342 343 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 344 if (error) 345 goto out_unlock; 346 347 spin_lock(&sdp->sd_statfs_spin); 348 gfs2_statfs_change_in(m_sc, m_bh->b_data + 349 sizeof(struct gfs2_dinode)); 350 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { 351 spin_unlock(&sdp->sd_statfs_spin); 352 goto out_bh; 353 } 354 spin_unlock(&sdp->sd_statfs_spin); 355 356 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 357 if (error) 358 goto out_bh; 359 360 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 361 if (error) 362 goto out_bh2; 363 364 update_statfs(sdp, m_bh, l_bh); 365 sdp->sd_statfs_force_sync = 0; 366 367 gfs2_trans_end(sdp); 368 369 out_bh2: 370 brelse(l_bh); 371 out_bh: 372 brelse(m_bh); 373 out_unlock: 374 gfs2_glock_dq_uninit(&gh); 375 out: 376 return error; 377 } 378 379 struct lfcc { 380 struct list_head list; 381 struct gfs2_holder gh; 382 }; 383 384 /** 385 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all 386 * journals are clean 387 * @sdp: the file system 388 * @state: the state to put the transaction lock into 389 * @t_gh: the hold on the transaction lock 390 * 391 * Returns: errno 392 */ 393 394 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp) 395 { 396 struct gfs2_inode *ip; 397 struct gfs2_jdesc *jd; 398 struct lfcc *lfcc; 399 LIST_HEAD(list); 400 struct gfs2_log_header_host lh; 401 int error; 402 403 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 404 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); 405 if (!lfcc) { 406 error = -ENOMEM; 407 goto out; 408 } 409 ip = GFS2_I(jd->jd_inode); 410 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); 411 if (error) { 412 kfree(lfcc); 413 goto out; 414 } 415 list_add(&lfcc->list, &list); 416 } 417 418 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE, 419 LM_FLAG_NOEXP, &sdp->sd_freeze_gh); 420 if (error) 421 goto out; 422 423 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 424 error = gfs2_jdesc_check(jd); 425 if (error) 426 break; 427 error = gfs2_find_jhead(jd, &lh, false); 428 if (error) 429 break; 430 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 431 error = -EBUSY; 432 break; 433 } 434 } 435 436 if (error) 437 gfs2_freeze_unlock(&sdp->sd_freeze_gh); 438 439 out: 440 while (!list_empty(&list)) { 441 lfcc = list_first_entry(&list, struct lfcc, list); 442 list_del(&lfcc->list); 443 gfs2_glock_dq_uninit(&lfcc->gh); 444 kfree(lfcc); 445 } 446 return error; 447 } 448 449 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 450 { 451 struct gfs2_dinode *str = buf; 452 453 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 454 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); 455 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); 456 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); 457 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); 458 str->di_mode = cpu_to_be32(ip->i_inode.i_mode); 459 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode)); 460 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode)); 461 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); 462 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode)); 463 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); 464 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 465 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); 466 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); 467 468 str->di_goal_meta = cpu_to_be64(ip->i_goal); 469 str->di_goal_data = cpu_to_be64(ip->i_goal); 470 str->di_generation = cpu_to_be64(ip->i_generation); 471 472 str->di_flags = cpu_to_be32(ip->i_diskflags); 473 str->di_height = cpu_to_be16(ip->i_height); 474 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && 475 !(ip->i_diskflags & GFS2_DIF_EXHASH) ? 476 GFS2_FORMAT_DE : 0); 477 str->di_depth = cpu_to_be16(ip->i_depth); 478 str->di_entries = cpu_to_be32(ip->i_entries); 479 480 str->di_eattr = cpu_to_be64(ip->i_eattr); 481 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); 482 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); 483 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); 484 } 485 486 /** 487 * gfs2_write_inode - Make sure the inode is stable on the disk 488 * @inode: The inode 489 * @wbc: The writeback control structure 490 * 491 * Returns: errno 492 */ 493 494 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) 495 { 496 struct gfs2_inode *ip = GFS2_I(inode); 497 struct gfs2_sbd *sdp = GFS2_SB(inode); 498 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 499 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host); 500 int ret = 0; 501 bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip)); 502 503 if (flush_all) 504 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, 505 GFS2_LOG_HEAD_FLUSH_NORMAL | 506 GFS2_LFC_WRITE_INODE); 507 if (bdi->wb.dirty_exceeded) 508 gfs2_ail1_flush(sdp, wbc); 509 else 510 filemap_fdatawrite(metamapping); 511 if (flush_all) 512 ret = filemap_fdatawait(metamapping); 513 if (ret) 514 mark_inode_dirty_sync(inode); 515 else { 516 spin_lock(&inode->i_lock); 517 if (!(inode->i_flags & I_DIRTY)) 518 gfs2_ordered_del_inode(ip); 519 spin_unlock(&inode->i_lock); 520 } 521 return ret; 522 } 523 524 /** 525 * gfs2_dirty_inode - check for atime updates 526 * @inode: The inode in question 527 * @flags: The type of dirty 528 * 529 * Unfortunately it can be called under any combination of inode 530 * glock and transaction lock, so we have to check carefully. 531 * 532 * At the moment this deals only with atime - it should be possible 533 * to expand that role in future, once a review of the locking has 534 * been carried out. 535 */ 536 537 static void gfs2_dirty_inode(struct inode *inode, int flags) 538 { 539 struct gfs2_inode *ip = GFS2_I(inode); 540 struct gfs2_sbd *sdp = GFS2_SB(inode); 541 struct buffer_head *bh; 542 struct gfs2_holder gh; 543 int need_unlock = 0; 544 int need_endtrans = 0; 545 int ret; 546 547 if (unlikely(gfs2_withdrawn(sdp))) 548 return; 549 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { 550 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 551 if (ret) { 552 fs_err(sdp, "dirty_inode: glock %d\n", ret); 553 gfs2_dump_glock(NULL, ip->i_gl, true); 554 return; 555 } 556 need_unlock = 1; 557 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) 558 return; 559 560 if (current->journal_info == NULL) { 561 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 562 if (ret) { 563 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); 564 goto out; 565 } 566 need_endtrans = 1; 567 } 568 569 ret = gfs2_meta_inode_buffer(ip, &bh); 570 if (ret == 0) { 571 gfs2_trans_add_meta(ip->i_gl, bh); 572 gfs2_dinode_out(ip, bh->b_data); 573 brelse(bh); 574 } 575 576 if (need_endtrans) 577 gfs2_trans_end(sdp); 578 out: 579 if (need_unlock) 580 gfs2_glock_dq_uninit(&gh); 581 } 582 583 /** 584 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 585 * @sdp: the filesystem 586 * 587 * Returns: errno 588 */ 589 590 int gfs2_make_fs_ro(struct gfs2_sbd *sdp) 591 { 592 int error = 0; 593 int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 594 595 gfs2_flush_delete_work(sdp); 596 if (!log_write_allowed && current == sdp->sd_quotad_process) 597 fs_warn(sdp, "The quotad daemon is withdrawing.\n"); 598 else if (sdp->sd_quotad_process) 599 kthread_stop(sdp->sd_quotad_process); 600 sdp->sd_quotad_process = NULL; 601 602 if (!log_write_allowed && current == sdp->sd_logd_process) 603 fs_warn(sdp, "The logd daemon is withdrawing.\n"); 604 else if (sdp->sd_logd_process) 605 kthread_stop(sdp->sd_logd_process); 606 sdp->sd_logd_process = NULL; 607 608 if (log_write_allowed) { 609 gfs2_quota_sync(sdp->sd_vfs, 0); 610 gfs2_statfs_sync(sdp->sd_vfs, 0); 611 612 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN | 613 GFS2_LFC_MAKE_FS_RO); 614 wait_event_timeout(sdp->sd_log_waitq, 615 gfs2_log_is_empty(sdp), 616 HZ * 5); 617 gfs2_assert_warn(sdp, gfs2_log_is_empty(sdp)); 618 } else { 619 wait_event_timeout(sdp->sd_log_waitq, 620 gfs2_log_is_empty(sdp), 621 HZ * 5); 622 } 623 gfs2_quota_cleanup(sdp); 624 625 if (!log_write_allowed) 626 sdp->sd_vfs->s_flags |= SB_RDONLY; 627 628 return error; 629 } 630 631 /** 632 * gfs2_put_super - Unmount the filesystem 633 * @sb: The VFS superblock 634 * 635 */ 636 637 static void gfs2_put_super(struct super_block *sb) 638 { 639 struct gfs2_sbd *sdp = sb->s_fs_info; 640 int error; 641 struct gfs2_jdesc *jd; 642 643 /* No more recovery requests */ 644 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 645 smp_mb(); 646 647 /* Wait on outstanding recovery */ 648 restart: 649 spin_lock(&sdp->sd_jindex_spin); 650 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 651 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 652 continue; 653 spin_unlock(&sdp->sd_jindex_spin); 654 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 655 TASK_UNINTERRUPTIBLE); 656 goto restart; 657 } 658 spin_unlock(&sdp->sd_jindex_spin); 659 660 if (!sb_rdonly(sb)) { 661 error = gfs2_make_fs_ro(sdp); 662 if (error) 663 gfs2_io_error(sdp); 664 } 665 WARN_ON(gfs2_withdrawing(sdp)); 666 667 /* At this point, we're through modifying the disk */ 668 669 /* Release stuff */ 670 671 iput(sdp->sd_jindex); 672 iput(sdp->sd_statfs_inode); 673 iput(sdp->sd_rindex); 674 iput(sdp->sd_quota_inode); 675 676 gfs2_glock_put(sdp->sd_rename_gl); 677 gfs2_glock_put(sdp->sd_freeze_gl); 678 679 if (!sdp->sd_args.ar_spectator) { 680 if (gfs2_holder_initialized(&sdp->sd_journal_gh)) 681 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 682 if (gfs2_holder_initialized(&sdp->sd_jinode_gh)) 683 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 684 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 685 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 686 free_local_statfs_inodes(sdp); 687 iput(sdp->sd_qc_inode); 688 } 689 690 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 691 gfs2_clear_rgrpd(sdp); 692 gfs2_jindex_free(sdp); 693 /* Take apart glock structures and buffer lists */ 694 gfs2_gl_hash_clear(sdp); 695 truncate_inode_pages_final(&sdp->sd_aspace); 696 gfs2_delete_debugfs_file(sdp); 697 /* Unmount the locking protocol */ 698 gfs2_lm_unmount(sdp); 699 700 /* At this point, we're through participating in the lockspace */ 701 gfs2_sys_fs_del(sdp); 702 free_sbd(sdp); 703 } 704 705 /** 706 * gfs2_sync_fs - sync the filesystem 707 * @sb: the superblock 708 * 709 * Flushes the log to disk. 710 */ 711 712 static int gfs2_sync_fs(struct super_block *sb, int wait) 713 { 714 struct gfs2_sbd *sdp = sb->s_fs_info; 715 716 gfs2_quota_sync(sb, -1); 717 if (wait) 718 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 719 GFS2_LFC_SYNC_FS); 720 return sdp->sd_log_error; 721 } 722 723 void gfs2_freeze_func(struct work_struct *work) 724 { 725 int error; 726 struct gfs2_holder freeze_gh; 727 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work); 728 struct super_block *sb = sdp->sd_vfs; 729 730 atomic_inc(&sb->s_active); 731 error = gfs2_freeze_lock(sdp, &freeze_gh, 0); 732 if (error) { 733 gfs2_assert_withdraw(sdp, 0); 734 } else { 735 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 736 error = thaw_super(sb); 737 if (error) { 738 fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n", 739 error); 740 gfs2_assert_withdraw(sdp, 0); 741 } 742 gfs2_freeze_unlock(&freeze_gh); 743 } 744 deactivate_super(sb); 745 clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags); 746 wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN); 747 return; 748 } 749 750 /** 751 * gfs2_freeze - prevent further writes to the filesystem 752 * @sb: the VFS structure for the filesystem 753 * 754 */ 755 756 static int gfs2_freeze(struct super_block *sb) 757 { 758 struct gfs2_sbd *sdp = sb->s_fs_info; 759 int error = 0; 760 761 mutex_lock(&sdp->sd_freeze_mutex); 762 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) 763 goto out; 764 765 for (;;) { 766 if (gfs2_withdrawn(sdp)) { 767 error = -EINVAL; 768 goto out; 769 } 770 771 error = gfs2_lock_fs_check_clean(sdp); 772 if (!error) 773 break; 774 775 if (error == -EBUSY) 776 fs_err(sdp, "waiting for recovery before freeze\n"); 777 else if (error == -EIO) { 778 fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due " 779 "to recovery error.\n"); 780 goto out; 781 } else { 782 fs_err(sdp, "error freezing FS: %d\n", error); 783 } 784 fs_err(sdp, "retrying...\n"); 785 msleep(1000); 786 } 787 set_bit(SDF_FS_FROZEN, &sdp->sd_flags); 788 out: 789 mutex_unlock(&sdp->sd_freeze_mutex); 790 return error; 791 } 792 793 /** 794 * gfs2_unfreeze - reallow writes to the filesystem 795 * @sb: the VFS structure for the filesystem 796 * 797 */ 798 799 static int gfs2_unfreeze(struct super_block *sb) 800 { 801 struct gfs2_sbd *sdp = sb->s_fs_info; 802 803 mutex_lock(&sdp->sd_freeze_mutex); 804 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN || 805 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) { 806 mutex_unlock(&sdp->sd_freeze_mutex); 807 return 0; 808 } 809 810 gfs2_freeze_unlock(&sdp->sd_freeze_gh); 811 mutex_unlock(&sdp->sd_freeze_mutex); 812 return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE); 813 } 814 815 /** 816 * statfs_fill - fill in the sg for a given RG 817 * @rgd: the RG 818 * @sc: the sc structure 819 * 820 * Returns: 0 on success, -ESTALE if the LVB is invalid 821 */ 822 823 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 824 struct gfs2_statfs_change_host *sc) 825 { 826 gfs2_rgrp_verify(rgd); 827 sc->sc_total += rgd->rd_data; 828 sc->sc_free += rgd->rd_free; 829 sc->sc_dinodes += rgd->rd_dinodes; 830 return 0; 831 } 832 833 /** 834 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 835 * @sdp: the filesystem 836 * @sc: the sc info that will be returned 837 * 838 * Any error (other than a signal) will cause this routine to fall back 839 * to the synchronous version. 840 * 841 * FIXME: This really shouldn't busy wait like this. 842 * 843 * Returns: errno 844 */ 845 846 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 847 { 848 struct gfs2_rgrpd *rgd_next; 849 struct gfs2_holder *gha, *gh; 850 unsigned int slots = 64; 851 unsigned int x; 852 int done; 853 int error = 0, err; 854 855 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 856 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 857 if (!gha) 858 return -ENOMEM; 859 for (x = 0; x < slots; x++) 860 gfs2_holder_mark_uninitialized(gha + x); 861 862 rgd_next = gfs2_rgrpd_get_first(sdp); 863 864 for (;;) { 865 done = 1; 866 867 for (x = 0; x < slots; x++) { 868 gh = gha + x; 869 870 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) { 871 err = gfs2_glock_wait(gh); 872 if (err) { 873 gfs2_holder_uninit(gh); 874 error = err; 875 } else { 876 if (!error) { 877 struct gfs2_rgrpd *rgd = 878 gfs2_glock2rgrp(gh->gh_gl); 879 880 error = statfs_slow_fill(rgd, sc); 881 } 882 gfs2_glock_dq_uninit(gh); 883 } 884 } 885 886 if (gfs2_holder_initialized(gh)) 887 done = 0; 888 else if (rgd_next && !error) { 889 error = gfs2_glock_nq_init(rgd_next->rd_gl, 890 LM_ST_SHARED, 891 GL_ASYNC, 892 gh); 893 rgd_next = gfs2_rgrpd_get_next(rgd_next); 894 done = 0; 895 } 896 897 if (signal_pending(current)) 898 error = -ERESTARTSYS; 899 } 900 901 if (done) 902 break; 903 904 yield(); 905 } 906 907 kfree(gha); 908 return error; 909 } 910 911 /** 912 * gfs2_statfs_i - Do a statfs 913 * @sdp: the filesystem 914 * @sg: the sg structure 915 * 916 * Returns: errno 917 */ 918 919 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 920 { 921 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 922 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 923 924 spin_lock(&sdp->sd_statfs_spin); 925 926 *sc = *m_sc; 927 sc->sc_total += l_sc->sc_total; 928 sc->sc_free += l_sc->sc_free; 929 sc->sc_dinodes += l_sc->sc_dinodes; 930 931 spin_unlock(&sdp->sd_statfs_spin); 932 933 if (sc->sc_free < 0) 934 sc->sc_free = 0; 935 if (sc->sc_free > sc->sc_total) 936 sc->sc_free = sc->sc_total; 937 if (sc->sc_dinodes < 0) 938 sc->sc_dinodes = 0; 939 940 return 0; 941 } 942 943 /** 944 * gfs2_statfs - Gather and return stats about the filesystem 945 * @sb: The superblock 946 * @statfsbuf: The buffer 947 * 948 * Returns: 0 on success or error code 949 */ 950 951 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 952 { 953 struct super_block *sb = dentry->d_sb; 954 struct gfs2_sbd *sdp = sb->s_fs_info; 955 struct gfs2_statfs_change_host sc; 956 int error; 957 958 error = gfs2_rindex_update(sdp); 959 if (error) 960 return error; 961 962 if (gfs2_tune_get(sdp, gt_statfs_slow)) 963 error = gfs2_statfs_slow(sdp, &sc); 964 else 965 error = gfs2_statfs_i(sdp, &sc); 966 967 if (error) 968 return error; 969 970 buf->f_type = GFS2_MAGIC; 971 buf->f_bsize = sdp->sd_sb.sb_bsize; 972 buf->f_blocks = sc.sc_total; 973 buf->f_bfree = sc.sc_free; 974 buf->f_bavail = sc.sc_free; 975 buf->f_files = sc.sc_dinodes + sc.sc_free; 976 buf->f_ffree = sc.sc_free; 977 buf->f_namelen = GFS2_FNAMESIZE; 978 979 return 0; 980 } 981 982 /** 983 * gfs2_drop_inode - Drop an inode (test for remote unlink) 984 * @inode: The inode to drop 985 * 986 * If we've received a callback on an iopen lock then it's because a 987 * remote node tried to deallocate the inode but failed due to this node 988 * still having the inode open. Here we mark the link count zero 989 * since we know that it must have reached zero if the GLF_DEMOTE flag 990 * is set on the iopen glock. If we didn't do a disk read since the 991 * remote node removed the final link then we might otherwise miss 992 * this event. This check ensures that this node will deallocate the 993 * inode's blocks, or alternatively pass the baton on to another 994 * node for later deallocation. 995 */ 996 997 static int gfs2_drop_inode(struct inode *inode) 998 { 999 struct gfs2_inode *ip = GFS2_I(inode); 1000 1001 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && 1002 inode->i_nlink && 1003 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1004 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1005 if (test_bit(GLF_DEMOTE, &gl->gl_flags)) 1006 clear_nlink(inode); 1007 } 1008 1009 /* 1010 * When under memory pressure when an inode's link count has dropped to 1011 * zero, defer deleting the inode to the delete workqueue. This avoids 1012 * calling into DLM under memory pressure, which can deadlock. 1013 */ 1014 if (!inode->i_nlink && 1015 unlikely(current->flags & PF_MEMALLOC) && 1016 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1017 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1018 1019 gfs2_glock_hold(gl); 1020 if (!gfs2_queue_delete_work(gl, 0)) 1021 gfs2_glock_queue_put(gl); 1022 return false; 1023 } 1024 1025 return generic_drop_inode(inode); 1026 } 1027 1028 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 1029 { 1030 do { 1031 if (d1 == d2) 1032 return 1; 1033 d1 = d1->d_parent; 1034 } while (!IS_ROOT(d1)); 1035 return 0; 1036 } 1037 1038 /** 1039 * gfs2_show_options - Show mount options for /proc/mounts 1040 * @s: seq_file structure 1041 * @root: root of this (sub)tree 1042 * 1043 * Returns: 0 on success or error code 1044 */ 1045 1046 static int gfs2_show_options(struct seq_file *s, struct dentry *root) 1047 { 1048 struct gfs2_sbd *sdp = root->d_sb->s_fs_info; 1049 struct gfs2_args *args = &sdp->sd_args; 1050 int val; 1051 1052 if (is_ancestor(root, sdp->sd_master_dir)) 1053 seq_puts(s, ",meta"); 1054 if (args->ar_lockproto[0]) 1055 seq_show_option(s, "lockproto", args->ar_lockproto); 1056 if (args->ar_locktable[0]) 1057 seq_show_option(s, "locktable", args->ar_locktable); 1058 if (args->ar_hostdata[0]) 1059 seq_show_option(s, "hostdata", args->ar_hostdata); 1060 if (args->ar_spectator) 1061 seq_puts(s, ",spectator"); 1062 if (args->ar_localflocks) 1063 seq_puts(s, ",localflocks"); 1064 if (args->ar_debug) 1065 seq_puts(s, ",debug"); 1066 if (args->ar_posix_acl) 1067 seq_puts(s, ",acl"); 1068 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 1069 char *state; 1070 switch (args->ar_quota) { 1071 case GFS2_QUOTA_OFF: 1072 state = "off"; 1073 break; 1074 case GFS2_QUOTA_ACCOUNT: 1075 state = "account"; 1076 break; 1077 case GFS2_QUOTA_ON: 1078 state = "on"; 1079 break; 1080 default: 1081 state = "unknown"; 1082 break; 1083 } 1084 seq_printf(s, ",quota=%s", state); 1085 } 1086 if (args->ar_suiddir) 1087 seq_puts(s, ",suiddir"); 1088 if (args->ar_data != GFS2_DATA_DEFAULT) { 1089 char *state; 1090 switch (args->ar_data) { 1091 case GFS2_DATA_WRITEBACK: 1092 state = "writeback"; 1093 break; 1094 case GFS2_DATA_ORDERED: 1095 state = "ordered"; 1096 break; 1097 default: 1098 state = "unknown"; 1099 break; 1100 } 1101 seq_printf(s, ",data=%s", state); 1102 } 1103 if (args->ar_discard) 1104 seq_puts(s, ",discard"); 1105 val = sdp->sd_tune.gt_logd_secs; 1106 if (val != 30) 1107 seq_printf(s, ",commit=%d", val); 1108 val = sdp->sd_tune.gt_statfs_quantum; 1109 if (val != 30) 1110 seq_printf(s, ",statfs_quantum=%d", val); 1111 else if (sdp->sd_tune.gt_statfs_slow) 1112 seq_puts(s, ",statfs_quantum=0"); 1113 val = sdp->sd_tune.gt_quota_quantum; 1114 if (val != 60) 1115 seq_printf(s, ",quota_quantum=%d", val); 1116 if (args->ar_statfs_percent) 1117 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1118 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1119 const char *state; 1120 1121 switch (args->ar_errors) { 1122 case GFS2_ERRORS_WITHDRAW: 1123 state = "withdraw"; 1124 break; 1125 case GFS2_ERRORS_PANIC: 1126 state = "panic"; 1127 break; 1128 default: 1129 state = "unknown"; 1130 break; 1131 } 1132 seq_printf(s, ",errors=%s", state); 1133 } 1134 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1135 seq_puts(s, ",nobarrier"); 1136 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1137 seq_puts(s, ",demote_interface_used"); 1138 if (args->ar_rgrplvb) 1139 seq_puts(s, ",rgrplvb"); 1140 if (args->ar_loccookie) 1141 seq_puts(s, ",loccookie"); 1142 return 0; 1143 } 1144 1145 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1146 { 1147 struct inode *inode = &ip->i_inode; 1148 struct gfs2_glock *gl = ip->i_gl; 1149 1150 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1151 truncate_inode_pages(&inode->i_data, 0); 1152 1153 if (atomic_read(&gl->gl_revokes) == 0) { 1154 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1155 clear_bit(GLF_DIRTY, &gl->gl_flags); 1156 } 1157 } 1158 1159 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1160 { 1161 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1162 struct gfs2_rgrpd *rgd; 1163 struct gfs2_holder gh; 1164 int error; 1165 1166 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1167 gfs2_consist_inode(ip); 1168 return -EIO; 1169 } 1170 1171 error = gfs2_rindex_update(sdp); 1172 if (error) 1173 return error; 1174 1175 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 1176 if (error) 1177 return error; 1178 1179 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1180 if (!rgd) { 1181 gfs2_consist_inode(ip); 1182 error = -EIO; 1183 goto out_qs; 1184 } 1185 1186 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 1187 LM_FLAG_NODE_SCOPE, &gh); 1188 if (error) 1189 goto out_qs; 1190 1191 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1192 sdp->sd_jdesc->jd_blocks); 1193 if (error) 1194 goto out_rg_gunlock; 1195 1196 gfs2_free_di(rgd, ip); 1197 1198 gfs2_final_release_pages(ip); 1199 1200 gfs2_trans_end(sdp); 1201 1202 out_rg_gunlock: 1203 gfs2_glock_dq_uninit(&gh); 1204 out_qs: 1205 gfs2_quota_unhold(ip); 1206 return error; 1207 } 1208 1209 /** 1210 * gfs2_glock_put_eventually 1211 * @gl: The glock to put 1212 * 1213 * When under memory pressure, trigger a deferred glock put to make sure we 1214 * won't call into DLM and deadlock. Otherwise, put the glock directly. 1215 */ 1216 1217 static void gfs2_glock_put_eventually(struct gfs2_glock *gl) 1218 { 1219 if (current->flags & PF_MEMALLOC) 1220 gfs2_glock_queue_put(gl); 1221 else 1222 gfs2_glock_put(gl); 1223 } 1224 1225 static bool gfs2_upgrade_iopen_glock(struct inode *inode) 1226 { 1227 struct gfs2_inode *ip = GFS2_I(inode); 1228 struct gfs2_sbd *sdp = GFS2_SB(inode); 1229 struct gfs2_holder *gh = &ip->i_iopen_gh; 1230 long timeout = 5 * HZ; 1231 int error; 1232 1233 gh->gh_flags |= GL_NOCACHE; 1234 gfs2_glock_dq_wait(gh); 1235 1236 /* 1237 * If there are no other lock holders, we'll get the lock immediately. 1238 * Otherwise, the other nodes holding the lock will be notified about 1239 * our locking request. If they don't have the inode open, they'll 1240 * evict the cached inode and release the lock. Otherwise, if they 1241 * poke the inode glock, we'll take this as an indication that they 1242 * still need the iopen glock and that they'll take care of deleting 1243 * the inode when they're done. As a last resort, if another node 1244 * keeps holding the iopen glock without showing any activity on the 1245 * inode glock, we'll eventually time out. 1246 * 1247 * Note that we're passing the LM_FLAG_TRY_1CB flag to the first 1248 * locking request as an optimization to notify lock holders as soon as 1249 * possible. Without that flag, they'd be notified implicitly by the 1250 * second locking request. 1251 */ 1252 1253 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh); 1254 error = gfs2_glock_nq(gh); 1255 if (error != GLR_TRYFAILED) 1256 return !error; 1257 1258 gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh); 1259 error = gfs2_glock_nq(gh); 1260 if (error) 1261 return false; 1262 1263 timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait, 1264 !test_bit(HIF_WAIT, &gh->gh_iflags) || 1265 test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags), 1266 timeout); 1267 if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) { 1268 gfs2_glock_dq(gh); 1269 return false; 1270 } 1271 return true; 1272 } 1273 1274 /** 1275 * evict_should_delete - determine whether the inode is eligible for deletion 1276 * @inode: The inode to evict 1277 * 1278 * This function determines whether the evicted inode is eligible to be deleted 1279 * and locks the inode glock. 1280 * 1281 * Returns: the fate of the dinode 1282 */ 1283 static enum dinode_demise evict_should_delete(struct inode *inode, 1284 struct gfs2_holder *gh) 1285 { 1286 struct gfs2_inode *ip = GFS2_I(inode); 1287 struct super_block *sb = inode->i_sb; 1288 struct gfs2_sbd *sdp = sb->s_fs_info; 1289 int ret; 1290 1291 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { 1292 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl)); 1293 goto should_delete; 1294 } 1295 1296 if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags)) 1297 return SHOULD_DEFER_EVICTION; 1298 1299 /* Deletes should never happen under memory pressure anymore. */ 1300 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC)) 1301 return SHOULD_DEFER_EVICTION; 1302 1303 /* Must not read inode block until block type has been verified */ 1304 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh); 1305 if (unlikely(ret)) { 1306 glock_clear_object(ip->i_iopen_gh.gh_gl, ip); 1307 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1308 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1309 return SHOULD_DEFER_EVICTION; 1310 } 1311 1312 if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino)) 1313 return SHOULD_NOT_DELETE_DINODE; 1314 ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1315 if (ret) 1316 return SHOULD_NOT_DELETE_DINODE; 1317 1318 if (test_bit(GIF_INVALID, &ip->i_flags)) { 1319 ret = gfs2_inode_refresh(ip); 1320 if (ret) 1321 return SHOULD_NOT_DELETE_DINODE; 1322 } 1323 1324 /* 1325 * The inode may have been recreated in the meantime. 1326 */ 1327 if (inode->i_nlink) 1328 return SHOULD_NOT_DELETE_DINODE; 1329 1330 should_delete: 1331 if (gfs2_holder_initialized(&ip->i_iopen_gh) && 1332 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1333 if (!gfs2_upgrade_iopen_glock(inode)) { 1334 gfs2_holder_uninit(&ip->i_iopen_gh); 1335 return SHOULD_NOT_DELETE_DINODE; 1336 } 1337 } 1338 return SHOULD_DELETE_DINODE; 1339 } 1340 1341 /** 1342 * evict_unlinked_inode - delete the pieces of an unlinked evicted inode 1343 * @inode: The inode to evict 1344 */ 1345 static int evict_unlinked_inode(struct inode *inode) 1346 { 1347 struct gfs2_inode *ip = GFS2_I(inode); 1348 int ret; 1349 1350 if (S_ISDIR(inode->i_mode) && 1351 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1352 ret = gfs2_dir_exhash_dealloc(ip); 1353 if (ret) 1354 goto out; 1355 } 1356 1357 if (ip->i_eattr) { 1358 ret = gfs2_ea_dealloc(ip); 1359 if (ret) 1360 goto out; 1361 } 1362 1363 if (!gfs2_is_stuffed(ip)) { 1364 ret = gfs2_file_dealloc(ip); 1365 if (ret) 1366 goto out; 1367 } 1368 1369 /* We're about to clear the bitmap for the dinode, but as soon as we 1370 do, gfs2_create_inode can create another inode at the same block 1371 location and try to set gl_object again. We clear gl_object here so 1372 that subsequent inode creates don't see an old gl_object. */ 1373 glock_clear_object(ip->i_gl, ip); 1374 ret = gfs2_dinode_dealloc(ip); 1375 gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino); 1376 out: 1377 return ret; 1378 } 1379 1380 /* 1381 * evict_linked_inode - evict an inode whose dinode has not been unlinked 1382 * @inode: The inode to evict 1383 */ 1384 static int evict_linked_inode(struct inode *inode) 1385 { 1386 struct super_block *sb = inode->i_sb; 1387 struct gfs2_sbd *sdp = sb->s_fs_info; 1388 struct gfs2_inode *ip = GFS2_I(inode); 1389 struct address_space *metamapping; 1390 int ret; 1391 1392 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 1393 GFS2_LFC_EVICT_INODE); 1394 metamapping = gfs2_glock2aspace(ip->i_gl); 1395 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1396 filemap_fdatawrite(metamapping); 1397 filemap_fdatawait(metamapping); 1398 } 1399 write_inode_now(inode, 1); 1400 gfs2_ail_flush(ip->i_gl, 0); 1401 1402 ret = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1403 if (ret) 1404 return ret; 1405 1406 /* Needs to be done before glock release & also in a transaction */ 1407 truncate_inode_pages(&inode->i_data, 0); 1408 truncate_inode_pages(metamapping, 0); 1409 gfs2_trans_end(sdp); 1410 return 0; 1411 } 1412 1413 /** 1414 * gfs2_evict_inode - Remove an inode from cache 1415 * @inode: The inode to evict 1416 * 1417 * There are three cases to consider: 1418 * 1. i_nlink == 0, we are final opener (and must deallocate) 1419 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1420 * 3. i_nlink > 0 1421 * 1422 * If the fs is read only, then we have to treat all cases as per #3 1423 * since we are unable to do any deallocation. The inode will be 1424 * deallocated by the next read/write node to attempt an allocation 1425 * in the same resource group 1426 * 1427 * We have to (at the moment) hold the inodes main lock to cover 1428 * the gap between unlocking the shared lock on the iopen lock and 1429 * taking the exclusive lock. I'd rather do a shared -> exclusive 1430 * conversion on the iopen lock, but we can change that later. This 1431 * is safe, just less efficient. 1432 */ 1433 1434 static void gfs2_evict_inode(struct inode *inode) 1435 { 1436 struct super_block *sb = inode->i_sb; 1437 struct gfs2_sbd *sdp = sb->s_fs_info; 1438 struct gfs2_inode *ip = GFS2_I(inode); 1439 struct gfs2_holder gh; 1440 int ret; 1441 1442 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) { 1443 clear_inode(inode); 1444 return; 1445 } 1446 1447 if (inode->i_nlink || sb_rdonly(sb)) 1448 goto out; 1449 1450 gfs2_holder_mark_uninitialized(&gh); 1451 ret = evict_should_delete(inode, &gh); 1452 if (ret == SHOULD_DEFER_EVICTION) 1453 goto out; 1454 if (ret == SHOULD_DELETE_DINODE) 1455 ret = evict_unlinked_inode(inode); 1456 else 1457 ret = evict_linked_inode(inode); 1458 1459 if (gfs2_rs_active(&ip->i_res)) 1460 gfs2_rs_deltree(&ip->i_res); 1461 1462 if (gfs2_holder_initialized(&gh)) { 1463 glock_clear_object(ip->i_gl, ip); 1464 gfs2_glock_dq_uninit(&gh); 1465 } 1466 if (ret && ret != GLR_TRYFAILED && ret != -EROFS) 1467 fs_warn(sdp, "gfs2_evict_inode: %d\n", ret); 1468 out: 1469 truncate_inode_pages_final(&inode->i_data); 1470 if (ip->i_qadata) 1471 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0); 1472 gfs2_rs_delete(ip, NULL); 1473 gfs2_ordered_del_inode(ip); 1474 clear_inode(inode); 1475 gfs2_dir_hash_inval(ip); 1476 if (ip->i_gl) { 1477 glock_clear_object(ip->i_gl, ip); 1478 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE); 1479 gfs2_glock_add_to_lru(ip->i_gl); 1480 gfs2_glock_put_eventually(ip->i_gl); 1481 ip->i_gl = NULL; 1482 } 1483 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1484 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1485 1486 glock_clear_object(gl, ip); 1487 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1488 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1489 gfs2_glock_dq(&ip->i_iopen_gh); 1490 } 1491 gfs2_glock_hold(gl); 1492 gfs2_holder_uninit(&ip->i_iopen_gh); 1493 gfs2_glock_put_eventually(gl); 1494 } 1495 } 1496 1497 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1498 { 1499 struct gfs2_inode *ip; 1500 1501 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1502 if (!ip) 1503 return NULL; 1504 ip->i_flags = 0; 1505 ip->i_gl = NULL; 1506 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh); 1507 memset(&ip->i_res, 0, sizeof(ip->i_res)); 1508 RB_CLEAR_NODE(&ip->i_res.rs_node); 1509 ip->i_rahead = 0; 1510 return &ip->i_inode; 1511 } 1512 1513 static void gfs2_free_inode(struct inode *inode) 1514 { 1515 kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode)); 1516 } 1517 1518 extern void free_local_statfs_inodes(struct gfs2_sbd *sdp) 1519 { 1520 struct local_statfs_inode *lsi, *safe; 1521 1522 /* Run through the statfs inodes list to iput and free memory */ 1523 list_for_each_entry_safe(lsi, safe, &sdp->sd_sc_inodes_list, si_list) { 1524 if (lsi->si_jid == sdp->sd_jdesc->jd_jid) 1525 sdp->sd_sc_inode = NULL; /* belongs to this node */ 1526 if (lsi->si_sc_inode) 1527 iput(lsi->si_sc_inode); 1528 list_del(&lsi->si_list); 1529 kfree(lsi); 1530 } 1531 } 1532 1533 extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp, 1534 unsigned int index) 1535 { 1536 struct local_statfs_inode *lsi; 1537 1538 /* Return the local (per node) statfs inode in the 1539 * sdp->sd_sc_inodes_list corresponding to the 'index'. */ 1540 list_for_each_entry(lsi, &sdp->sd_sc_inodes_list, si_list) { 1541 if (lsi->si_jid == index) 1542 return lsi->si_sc_inode; 1543 } 1544 return NULL; 1545 } 1546 1547 const struct super_operations gfs2_super_ops = { 1548 .alloc_inode = gfs2_alloc_inode, 1549 .free_inode = gfs2_free_inode, 1550 .write_inode = gfs2_write_inode, 1551 .dirty_inode = gfs2_dirty_inode, 1552 .evict_inode = gfs2_evict_inode, 1553 .put_super = gfs2_put_super, 1554 .sync_fs = gfs2_sync_fs, 1555 .freeze_super = gfs2_freeze, 1556 .thaw_super = gfs2_unfreeze, 1557 .statfs = gfs2_statfs, 1558 .drop_inode = gfs2_drop_inode, 1559 .show_options = gfs2_show_options, 1560 }; 1561 1562