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 gfs2_withdraw_delayed(sdp); 167 return error; 168 } 169 170 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 171 if (gfs2_withdrawn(sdp)) { 172 error = -EIO; 173 goto fail; 174 } 175 176 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false); 177 if (error || gfs2_withdrawn(sdp)) 178 goto fail; 179 180 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 181 gfs2_consist(sdp); 182 error = -EIO; 183 goto fail; 184 } 185 186 /* Initialize some head of the log stuff */ 187 sdp->sd_log_sequence = head.lh_sequence + 1; 188 gfs2_log_pointers_init(sdp, head.lh_blkno); 189 190 error = gfs2_quota_init(sdp); 191 if (error || gfs2_withdrawn(sdp)) 192 goto fail; 193 194 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 195 196 return 0; 197 198 fail: 199 if (sdp->sd_quotad_process) 200 kthread_stop(sdp->sd_quotad_process); 201 sdp->sd_quotad_process = NULL; 202 if (sdp->sd_logd_process) 203 kthread_stop(sdp->sd_logd_process); 204 sdp->sd_logd_process = NULL; 205 return error; 206 } 207 208 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) 209 { 210 const struct gfs2_statfs_change *str = buf; 211 212 sc->sc_total = be64_to_cpu(str->sc_total); 213 sc->sc_free = be64_to_cpu(str->sc_free); 214 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); 215 } 216 217 void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) 218 { 219 struct gfs2_statfs_change *str = buf; 220 221 str->sc_total = cpu_to_be64(sc->sc_total); 222 str->sc_free = cpu_to_be64(sc->sc_free); 223 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); 224 } 225 226 int gfs2_statfs_init(struct gfs2_sbd *sdp) 227 { 228 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 229 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 230 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 231 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 232 struct buffer_head *m_bh, *l_bh; 233 struct gfs2_holder gh; 234 int error; 235 236 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 237 &gh); 238 if (error) 239 return error; 240 241 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 242 if (error) 243 goto out; 244 245 if (sdp->sd_args.ar_spectator) { 246 spin_lock(&sdp->sd_statfs_spin); 247 gfs2_statfs_change_in(m_sc, m_bh->b_data + 248 sizeof(struct gfs2_dinode)); 249 spin_unlock(&sdp->sd_statfs_spin); 250 } else { 251 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 252 if (error) 253 goto out_m_bh; 254 255 spin_lock(&sdp->sd_statfs_spin); 256 gfs2_statfs_change_in(m_sc, m_bh->b_data + 257 sizeof(struct gfs2_dinode)); 258 gfs2_statfs_change_in(l_sc, l_bh->b_data + 259 sizeof(struct gfs2_dinode)); 260 spin_unlock(&sdp->sd_statfs_spin); 261 262 brelse(l_bh); 263 } 264 265 out_m_bh: 266 brelse(m_bh); 267 out: 268 gfs2_glock_dq_uninit(&gh); 269 return 0; 270 } 271 272 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, 273 s64 dinodes) 274 { 275 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 276 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 277 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 278 struct buffer_head *l_bh; 279 s64 x, y; 280 int need_sync = 0; 281 int error; 282 283 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 284 if (error) 285 return; 286 287 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 288 289 spin_lock(&sdp->sd_statfs_spin); 290 l_sc->sc_total += total; 291 l_sc->sc_free += free; 292 l_sc->sc_dinodes += dinodes; 293 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); 294 if (sdp->sd_args.ar_statfs_percent) { 295 x = 100 * l_sc->sc_free; 296 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent; 297 if (x >= y || x <= -y) 298 need_sync = 1; 299 } 300 spin_unlock(&sdp->sd_statfs_spin); 301 302 brelse(l_bh); 303 if (need_sync) 304 gfs2_wake_up_statfs(sdp); 305 } 306 307 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh, 308 struct buffer_head *l_bh) 309 { 310 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 311 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 312 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 313 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 314 315 gfs2_trans_add_meta(l_ip->i_gl, l_bh); 316 gfs2_trans_add_meta(m_ip->i_gl, m_bh); 317 318 spin_lock(&sdp->sd_statfs_spin); 319 m_sc->sc_total += l_sc->sc_total; 320 m_sc->sc_free += l_sc->sc_free; 321 m_sc->sc_dinodes += l_sc->sc_dinodes; 322 memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); 323 memset(l_bh->b_data + sizeof(struct gfs2_dinode), 324 0, sizeof(struct gfs2_statfs_change)); 325 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); 326 spin_unlock(&sdp->sd_statfs_spin); 327 } 328 329 int gfs2_statfs_sync(struct super_block *sb, int type) 330 { 331 struct gfs2_sbd *sdp = sb->s_fs_info; 332 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 333 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 334 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 335 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 336 struct gfs2_holder gh; 337 struct buffer_head *m_bh, *l_bh; 338 int error; 339 340 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 341 &gh); 342 if (error) 343 goto out; 344 345 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 346 if (error) 347 goto out_unlock; 348 349 spin_lock(&sdp->sd_statfs_spin); 350 gfs2_statfs_change_in(m_sc, m_bh->b_data + 351 sizeof(struct gfs2_dinode)); 352 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { 353 spin_unlock(&sdp->sd_statfs_spin); 354 goto out_bh; 355 } 356 spin_unlock(&sdp->sd_statfs_spin); 357 358 error = gfs2_meta_inode_buffer(l_ip, &l_bh); 359 if (error) 360 goto out_bh; 361 362 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 363 if (error) 364 goto out_bh2; 365 366 update_statfs(sdp, m_bh, l_bh); 367 sdp->sd_statfs_force_sync = 0; 368 369 gfs2_trans_end(sdp); 370 371 out_bh2: 372 brelse(l_bh); 373 out_bh: 374 brelse(m_bh); 375 out_unlock: 376 gfs2_glock_dq_uninit(&gh); 377 out: 378 return error; 379 } 380 381 struct lfcc { 382 struct list_head list; 383 struct gfs2_holder gh; 384 }; 385 386 /** 387 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all 388 * journals are clean 389 * @sdp: the file system 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 void gfs2_make_fs_ro(struct gfs2_sbd *sdp) 591 { 592 int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 593 594 gfs2_flush_delete_work(sdp); 595 if (!log_write_allowed && current == sdp->sd_quotad_process) 596 fs_warn(sdp, "The quotad daemon is withdrawing.\n"); 597 else if (sdp->sd_quotad_process) 598 kthread_stop(sdp->sd_quotad_process); 599 sdp->sd_quotad_process = NULL; 600 601 if (!log_write_allowed && current == sdp->sd_logd_process) 602 fs_warn(sdp, "The logd daemon is withdrawing.\n"); 603 else if (sdp->sd_logd_process) 604 kthread_stop(sdp->sd_logd_process); 605 sdp->sd_logd_process = NULL; 606 607 if (log_write_allowed) { 608 gfs2_quota_sync(sdp->sd_vfs, 0); 609 gfs2_statfs_sync(sdp->sd_vfs, 0); 610 611 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN | 612 GFS2_LFC_MAKE_FS_RO); 613 wait_event_timeout(sdp->sd_log_waitq, 614 gfs2_log_is_empty(sdp), 615 HZ * 5); 616 gfs2_assert_warn(sdp, gfs2_log_is_empty(sdp)); 617 } else { 618 wait_event_timeout(sdp->sd_log_waitq, 619 gfs2_log_is_empty(sdp), 620 HZ * 5); 621 } 622 gfs2_quota_cleanup(sdp); 623 624 if (!log_write_allowed) 625 sdp->sd_vfs->s_flags |= SB_RDONLY; 626 } 627 628 /** 629 * gfs2_put_super - Unmount the filesystem 630 * @sb: The VFS superblock 631 * 632 */ 633 634 static void gfs2_put_super(struct super_block *sb) 635 { 636 struct gfs2_sbd *sdp = sb->s_fs_info; 637 struct gfs2_jdesc *jd; 638 639 /* No more recovery requests */ 640 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 641 smp_mb(); 642 643 /* Wait on outstanding recovery */ 644 restart: 645 spin_lock(&sdp->sd_jindex_spin); 646 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 647 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 648 continue; 649 spin_unlock(&sdp->sd_jindex_spin); 650 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 651 TASK_UNINTERRUPTIBLE); 652 goto restart; 653 } 654 spin_unlock(&sdp->sd_jindex_spin); 655 656 if (!sb_rdonly(sb)) { 657 gfs2_make_fs_ro(sdp); 658 } 659 WARN_ON(gfs2_withdrawing(sdp)); 660 661 /* At this point, we're through modifying the disk */ 662 663 /* Release stuff */ 664 665 iput(sdp->sd_jindex); 666 iput(sdp->sd_statfs_inode); 667 iput(sdp->sd_rindex); 668 iput(sdp->sd_quota_inode); 669 670 gfs2_glock_put(sdp->sd_rename_gl); 671 gfs2_glock_put(sdp->sd_freeze_gl); 672 673 if (!sdp->sd_args.ar_spectator) { 674 if (gfs2_holder_initialized(&sdp->sd_journal_gh)) 675 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 676 if (gfs2_holder_initialized(&sdp->sd_jinode_gh)) 677 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 678 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 679 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 680 free_local_statfs_inodes(sdp); 681 iput(sdp->sd_qc_inode); 682 } 683 684 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 685 gfs2_clear_rgrpd(sdp); 686 gfs2_jindex_free(sdp); 687 /* Take apart glock structures and buffer lists */ 688 gfs2_gl_hash_clear(sdp); 689 truncate_inode_pages_final(&sdp->sd_aspace); 690 gfs2_delete_debugfs_file(sdp); 691 /* Unmount the locking protocol */ 692 gfs2_lm_unmount(sdp); 693 694 /* At this point, we're through participating in the lockspace */ 695 gfs2_sys_fs_del(sdp); 696 free_sbd(sdp); 697 } 698 699 /** 700 * gfs2_sync_fs - sync the filesystem 701 * @sb: the superblock 702 * @wait: true to wait for completion 703 * 704 * Flushes the log to disk. 705 */ 706 707 static int gfs2_sync_fs(struct super_block *sb, int wait) 708 { 709 struct gfs2_sbd *sdp = sb->s_fs_info; 710 711 gfs2_quota_sync(sb, -1); 712 if (wait) 713 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 714 GFS2_LFC_SYNC_FS); 715 return sdp->sd_log_error; 716 } 717 718 void gfs2_freeze_func(struct work_struct *work) 719 { 720 int error; 721 struct gfs2_holder freeze_gh; 722 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work); 723 struct super_block *sb = sdp->sd_vfs; 724 725 atomic_inc(&sb->s_active); 726 error = gfs2_freeze_lock(sdp, &freeze_gh, 0); 727 if (error) { 728 gfs2_assert_withdraw(sdp, 0); 729 } else { 730 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 731 error = thaw_super(sb); 732 if (error) { 733 fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n", 734 error); 735 gfs2_assert_withdraw(sdp, 0); 736 } 737 gfs2_freeze_unlock(&freeze_gh); 738 } 739 deactivate_super(sb); 740 clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags); 741 wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN); 742 return; 743 } 744 745 /** 746 * gfs2_freeze - prevent further writes to the filesystem 747 * @sb: the VFS structure for the filesystem 748 * 749 */ 750 751 static int gfs2_freeze(struct super_block *sb) 752 { 753 struct gfs2_sbd *sdp = sb->s_fs_info; 754 int error; 755 756 mutex_lock(&sdp->sd_freeze_mutex); 757 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) { 758 error = -EBUSY; 759 goto out; 760 } 761 762 for (;;) { 763 if (gfs2_withdrawn(sdp)) { 764 error = -EINVAL; 765 goto out; 766 } 767 768 error = gfs2_lock_fs_check_clean(sdp); 769 if (!error) 770 break; 771 772 if (error == -EBUSY) 773 fs_err(sdp, "waiting for recovery before freeze\n"); 774 else if (error == -EIO) { 775 fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due " 776 "to recovery error.\n"); 777 goto out; 778 } else { 779 fs_err(sdp, "error freezing FS: %d\n", error); 780 } 781 fs_err(sdp, "retrying...\n"); 782 msleep(1000); 783 } 784 set_bit(SDF_FS_FROZEN, &sdp->sd_flags); 785 out: 786 mutex_unlock(&sdp->sd_freeze_mutex); 787 return error; 788 } 789 790 /** 791 * gfs2_unfreeze - reallow writes to the filesystem 792 * @sb: the VFS structure for the filesystem 793 * 794 */ 795 796 static int gfs2_unfreeze(struct super_block *sb) 797 { 798 struct gfs2_sbd *sdp = sb->s_fs_info; 799 800 mutex_lock(&sdp->sd_freeze_mutex); 801 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN || 802 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) { 803 mutex_unlock(&sdp->sd_freeze_mutex); 804 return -EINVAL; 805 } 806 807 gfs2_freeze_unlock(&sdp->sd_freeze_gh); 808 mutex_unlock(&sdp->sd_freeze_mutex); 809 return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE); 810 } 811 812 /** 813 * statfs_slow_fill - fill in the sg for a given RG 814 * @rgd: the RG 815 * @sc: the sc structure 816 * 817 * Returns: 0 on success, -ESTALE if the LVB is invalid 818 */ 819 820 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 821 struct gfs2_statfs_change_host *sc) 822 { 823 gfs2_rgrp_verify(rgd); 824 sc->sc_total += rgd->rd_data; 825 sc->sc_free += rgd->rd_free; 826 sc->sc_dinodes += rgd->rd_dinodes; 827 return 0; 828 } 829 830 /** 831 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 832 * @sdp: the filesystem 833 * @sc: the sc info that will be returned 834 * 835 * Any error (other than a signal) will cause this routine to fall back 836 * to the synchronous version. 837 * 838 * FIXME: This really shouldn't busy wait like this. 839 * 840 * Returns: errno 841 */ 842 843 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 844 { 845 struct gfs2_rgrpd *rgd_next; 846 struct gfs2_holder *gha, *gh; 847 unsigned int slots = 64; 848 unsigned int x; 849 int done; 850 int error = 0, err; 851 852 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 853 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 854 if (!gha) 855 return -ENOMEM; 856 for (x = 0; x < slots; x++) 857 gfs2_holder_mark_uninitialized(gha + x); 858 859 rgd_next = gfs2_rgrpd_get_first(sdp); 860 861 for (;;) { 862 done = 1; 863 864 for (x = 0; x < slots; x++) { 865 gh = gha + x; 866 867 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) { 868 err = gfs2_glock_wait(gh); 869 if (err) { 870 gfs2_holder_uninit(gh); 871 error = err; 872 } else { 873 if (!error) { 874 struct gfs2_rgrpd *rgd = 875 gfs2_glock2rgrp(gh->gh_gl); 876 877 error = statfs_slow_fill(rgd, sc); 878 } 879 gfs2_glock_dq_uninit(gh); 880 } 881 } 882 883 if (gfs2_holder_initialized(gh)) 884 done = 0; 885 else if (rgd_next && !error) { 886 error = gfs2_glock_nq_init(rgd_next->rd_gl, 887 LM_ST_SHARED, 888 GL_ASYNC, 889 gh); 890 rgd_next = gfs2_rgrpd_get_next(rgd_next); 891 done = 0; 892 } 893 894 if (signal_pending(current)) 895 error = -ERESTARTSYS; 896 } 897 898 if (done) 899 break; 900 901 yield(); 902 } 903 904 kfree(gha); 905 return error; 906 } 907 908 /** 909 * gfs2_statfs_i - Do a statfs 910 * @sdp: the filesystem 911 * @sc: the sc structure 912 * 913 * Returns: errno 914 */ 915 916 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 917 { 918 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 919 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 920 921 spin_lock(&sdp->sd_statfs_spin); 922 923 *sc = *m_sc; 924 sc->sc_total += l_sc->sc_total; 925 sc->sc_free += l_sc->sc_free; 926 sc->sc_dinodes += l_sc->sc_dinodes; 927 928 spin_unlock(&sdp->sd_statfs_spin); 929 930 if (sc->sc_free < 0) 931 sc->sc_free = 0; 932 if (sc->sc_free > sc->sc_total) 933 sc->sc_free = sc->sc_total; 934 if (sc->sc_dinodes < 0) 935 sc->sc_dinodes = 0; 936 937 return 0; 938 } 939 940 /** 941 * gfs2_statfs - Gather and return stats about the filesystem 942 * @dentry: The name of the link 943 * @buf: The buffer 944 * 945 * Returns: 0 on success or error code 946 */ 947 948 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 949 { 950 struct super_block *sb = dentry->d_sb; 951 struct gfs2_sbd *sdp = sb->s_fs_info; 952 struct gfs2_statfs_change_host sc; 953 int error; 954 955 error = gfs2_rindex_update(sdp); 956 if (error) 957 return error; 958 959 if (gfs2_tune_get(sdp, gt_statfs_slow)) 960 error = gfs2_statfs_slow(sdp, &sc); 961 else 962 error = gfs2_statfs_i(sdp, &sc); 963 964 if (error) 965 return error; 966 967 buf->f_type = GFS2_MAGIC; 968 buf->f_bsize = sdp->sd_sb.sb_bsize; 969 buf->f_blocks = sc.sc_total; 970 buf->f_bfree = sc.sc_free; 971 buf->f_bavail = sc.sc_free; 972 buf->f_files = sc.sc_dinodes + sc.sc_free; 973 buf->f_ffree = sc.sc_free; 974 buf->f_namelen = GFS2_FNAMESIZE; 975 976 return 0; 977 } 978 979 /** 980 * gfs2_drop_inode - Drop an inode (test for remote unlink) 981 * @inode: The inode to drop 982 * 983 * If we've received a callback on an iopen lock then it's because a 984 * remote node tried to deallocate the inode but failed due to this node 985 * still having the inode open. Here we mark the link count zero 986 * since we know that it must have reached zero if the GLF_DEMOTE flag 987 * is set on the iopen glock. If we didn't do a disk read since the 988 * remote node removed the final link then we might otherwise miss 989 * this event. This check ensures that this node will deallocate the 990 * inode's blocks, or alternatively pass the baton on to another 991 * node for later deallocation. 992 */ 993 994 static int gfs2_drop_inode(struct inode *inode) 995 { 996 struct gfs2_inode *ip = GFS2_I(inode); 997 998 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && 999 inode->i_nlink && 1000 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1001 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1002 if (test_bit(GLF_DEMOTE, &gl->gl_flags)) 1003 clear_nlink(inode); 1004 } 1005 1006 /* 1007 * When under memory pressure when an inode's link count has dropped to 1008 * zero, defer deleting the inode to the delete workqueue. This avoids 1009 * calling into DLM under memory pressure, which can deadlock. 1010 */ 1011 if (!inode->i_nlink && 1012 unlikely(current->flags & PF_MEMALLOC) && 1013 gfs2_holder_initialized(&ip->i_iopen_gh)) { 1014 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1015 1016 gfs2_glock_hold(gl); 1017 if (!gfs2_queue_delete_work(gl, 0)) 1018 gfs2_glock_queue_put(gl); 1019 return false; 1020 } 1021 1022 return generic_drop_inode(inode); 1023 } 1024 1025 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 1026 { 1027 do { 1028 if (d1 == d2) 1029 return 1; 1030 d1 = d1->d_parent; 1031 } while (!IS_ROOT(d1)); 1032 return 0; 1033 } 1034 1035 /** 1036 * gfs2_show_options - Show mount options for /proc/mounts 1037 * @s: seq_file structure 1038 * @root: root of this (sub)tree 1039 * 1040 * Returns: 0 on success or error code 1041 */ 1042 1043 static int gfs2_show_options(struct seq_file *s, struct dentry *root) 1044 { 1045 struct gfs2_sbd *sdp = root->d_sb->s_fs_info; 1046 struct gfs2_args *args = &sdp->sd_args; 1047 int val; 1048 1049 if (is_ancestor(root, sdp->sd_master_dir)) 1050 seq_puts(s, ",meta"); 1051 if (args->ar_lockproto[0]) 1052 seq_show_option(s, "lockproto", args->ar_lockproto); 1053 if (args->ar_locktable[0]) 1054 seq_show_option(s, "locktable", args->ar_locktable); 1055 if (args->ar_hostdata[0]) 1056 seq_show_option(s, "hostdata", args->ar_hostdata); 1057 if (args->ar_spectator) 1058 seq_puts(s, ",spectator"); 1059 if (args->ar_localflocks) 1060 seq_puts(s, ",localflocks"); 1061 if (args->ar_debug) 1062 seq_puts(s, ",debug"); 1063 if (args->ar_posix_acl) 1064 seq_puts(s, ",acl"); 1065 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 1066 char *state; 1067 switch (args->ar_quota) { 1068 case GFS2_QUOTA_OFF: 1069 state = "off"; 1070 break; 1071 case GFS2_QUOTA_ACCOUNT: 1072 state = "account"; 1073 break; 1074 case GFS2_QUOTA_ON: 1075 state = "on"; 1076 break; 1077 default: 1078 state = "unknown"; 1079 break; 1080 } 1081 seq_printf(s, ",quota=%s", state); 1082 } 1083 if (args->ar_suiddir) 1084 seq_puts(s, ",suiddir"); 1085 if (args->ar_data != GFS2_DATA_DEFAULT) { 1086 char *state; 1087 switch (args->ar_data) { 1088 case GFS2_DATA_WRITEBACK: 1089 state = "writeback"; 1090 break; 1091 case GFS2_DATA_ORDERED: 1092 state = "ordered"; 1093 break; 1094 default: 1095 state = "unknown"; 1096 break; 1097 } 1098 seq_printf(s, ",data=%s", state); 1099 } 1100 if (args->ar_discard) 1101 seq_puts(s, ",discard"); 1102 val = sdp->sd_tune.gt_logd_secs; 1103 if (val != 30) 1104 seq_printf(s, ",commit=%d", val); 1105 val = sdp->sd_tune.gt_statfs_quantum; 1106 if (val != 30) 1107 seq_printf(s, ",statfs_quantum=%d", val); 1108 else if (sdp->sd_tune.gt_statfs_slow) 1109 seq_puts(s, ",statfs_quantum=0"); 1110 val = sdp->sd_tune.gt_quota_quantum; 1111 if (val != 60) 1112 seq_printf(s, ",quota_quantum=%d", val); 1113 if (args->ar_statfs_percent) 1114 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1115 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1116 const char *state; 1117 1118 switch (args->ar_errors) { 1119 case GFS2_ERRORS_WITHDRAW: 1120 state = "withdraw"; 1121 break; 1122 case GFS2_ERRORS_PANIC: 1123 state = "panic"; 1124 break; 1125 default: 1126 state = "unknown"; 1127 break; 1128 } 1129 seq_printf(s, ",errors=%s", state); 1130 } 1131 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1132 seq_puts(s, ",nobarrier"); 1133 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1134 seq_puts(s, ",demote_interface_used"); 1135 if (args->ar_rgrplvb) 1136 seq_puts(s, ",rgrplvb"); 1137 if (args->ar_loccookie) 1138 seq_puts(s, ",loccookie"); 1139 return 0; 1140 } 1141 1142 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1143 { 1144 struct inode *inode = &ip->i_inode; 1145 struct gfs2_glock *gl = ip->i_gl; 1146 1147 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1148 truncate_inode_pages(&inode->i_data, 0); 1149 1150 if (atomic_read(&gl->gl_revokes) == 0) { 1151 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1152 clear_bit(GLF_DIRTY, &gl->gl_flags); 1153 } 1154 } 1155 1156 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1157 { 1158 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1159 struct gfs2_rgrpd *rgd; 1160 struct gfs2_holder gh; 1161 int error; 1162 1163 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1164 gfs2_consist_inode(ip); 1165 return -EIO; 1166 } 1167 1168 error = gfs2_rindex_update(sdp); 1169 if (error) 1170 return error; 1171 1172 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 1173 if (error) 1174 return error; 1175 1176 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1177 if (!rgd) { 1178 gfs2_consist_inode(ip); 1179 error = -EIO; 1180 goto out_qs; 1181 } 1182 1183 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 1184 LM_FLAG_NODE_SCOPE, &gh); 1185 if (error) 1186 goto out_qs; 1187 1188 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1189 sdp->sd_jdesc->jd_blocks); 1190 if (error) 1191 goto out_rg_gunlock; 1192 1193 gfs2_free_di(rgd, ip); 1194 1195 gfs2_final_release_pages(ip); 1196 1197 gfs2_trans_end(sdp); 1198 1199 out_rg_gunlock: 1200 gfs2_glock_dq_uninit(&gh); 1201 out_qs: 1202 gfs2_quota_unhold(ip); 1203 return error; 1204 } 1205 1206 /** 1207 * gfs2_glock_put_eventually 1208 * @gl: The glock to put 1209 * 1210 * When under memory pressure, trigger a deferred glock put to make sure we 1211 * won't call into DLM and deadlock. Otherwise, put the glock directly. 1212 */ 1213 1214 static void gfs2_glock_put_eventually(struct gfs2_glock *gl) 1215 { 1216 if (current->flags & PF_MEMALLOC) 1217 gfs2_glock_queue_put(gl); 1218 else 1219 gfs2_glock_put(gl); 1220 } 1221 1222 static bool gfs2_upgrade_iopen_glock(struct inode *inode) 1223 { 1224 struct gfs2_inode *ip = GFS2_I(inode); 1225 struct gfs2_sbd *sdp = GFS2_SB(inode); 1226 struct gfs2_holder *gh = &ip->i_iopen_gh; 1227 long timeout = 5 * HZ; 1228 int error; 1229 1230 gh->gh_flags |= GL_NOCACHE; 1231 gfs2_glock_dq_wait(gh); 1232 1233 /* 1234 * If there are no other lock holders, we'll get the lock immediately. 1235 * Otherwise, the other nodes holding the lock will be notified about 1236 * our locking request. If they don't have the inode open, they'll 1237 * evict the cached inode and release the lock. Otherwise, if they 1238 * poke the inode glock, we'll take this as an indication that they 1239 * still need the iopen glock and that they'll take care of deleting 1240 * the inode when they're done. As a last resort, if another node 1241 * keeps holding the iopen glock without showing any activity on the 1242 * inode glock, we'll eventually time out. 1243 * 1244 * Note that we're passing the LM_FLAG_TRY_1CB flag to the first 1245 * locking request as an optimization to notify lock holders as soon as 1246 * possible. Without that flag, they'd be notified implicitly by the 1247 * second locking request. 1248 */ 1249 1250 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh); 1251 error = gfs2_glock_nq(gh); 1252 if (error != GLR_TRYFAILED) 1253 return !error; 1254 1255 gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh); 1256 error = gfs2_glock_nq(gh); 1257 if (error) 1258 return false; 1259 1260 timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait, 1261 !test_bit(HIF_WAIT, &gh->gh_iflags) || 1262 test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags), 1263 timeout); 1264 if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) { 1265 gfs2_glock_dq(gh); 1266 return false; 1267 } 1268 return true; 1269 } 1270 1271 /** 1272 * evict_should_delete - determine whether the inode is eligible for deletion 1273 * @inode: The inode to evict 1274 * @gh: The glock holder structure 1275 * 1276 * This function determines whether the evicted inode is eligible to be deleted 1277 * and locks the inode glock. 1278 * 1279 * Returns: the fate of the dinode 1280 */ 1281 static enum dinode_demise evict_should_delete(struct inode *inode, 1282 struct gfs2_holder *gh) 1283 { 1284 struct gfs2_inode *ip = GFS2_I(inode); 1285 struct super_block *sb = inode->i_sb; 1286 struct gfs2_sbd *sdp = sb->s_fs_info; 1287 int ret; 1288 1289 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { 1290 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl)); 1291 goto should_delete; 1292 } 1293 1294 if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags)) 1295 return SHOULD_DEFER_EVICTION; 1296 1297 /* Deletes should never happen under memory pressure anymore. */ 1298 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC)) 1299 return SHOULD_DEFER_EVICTION; 1300 1301 /* Must not read inode block until block type has been verified */ 1302 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh); 1303 if (unlikely(ret)) { 1304 glock_clear_object(ip->i_iopen_gh.gh_gl, ip); 1305 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1306 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1307 return SHOULD_DEFER_EVICTION; 1308 } 1309 1310 if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino)) 1311 return SHOULD_NOT_DELETE_DINODE; 1312 ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1313 if (ret) 1314 return SHOULD_NOT_DELETE_DINODE; 1315 1316 if (test_bit(GIF_INVALID, &ip->i_flags)) { 1317 ret = gfs2_inode_refresh(ip); 1318 if (ret) 1319 return SHOULD_NOT_DELETE_DINODE; 1320 } 1321 1322 /* 1323 * The inode may have been recreated in the meantime. 1324 */ 1325 if (inode->i_nlink) 1326 return SHOULD_NOT_DELETE_DINODE; 1327 1328 should_delete: 1329 if (gfs2_holder_initialized(&ip->i_iopen_gh) && 1330 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1331 if (!gfs2_upgrade_iopen_glock(inode)) { 1332 gfs2_holder_uninit(&ip->i_iopen_gh); 1333 return SHOULD_NOT_DELETE_DINODE; 1334 } 1335 } 1336 return SHOULD_DELETE_DINODE; 1337 } 1338 1339 /** 1340 * evict_unlinked_inode - delete the pieces of an unlinked evicted inode 1341 * @inode: The inode to evict 1342 */ 1343 static int evict_unlinked_inode(struct inode *inode) 1344 { 1345 struct gfs2_inode *ip = GFS2_I(inode); 1346 int ret; 1347 1348 if (S_ISDIR(inode->i_mode) && 1349 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1350 ret = gfs2_dir_exhash_dealloc(ip); 1351 if (ret) 1352 goto out; 1353 } 1354 1355 if (ip->i_eattr) { 1356 ret = gfs2_ea_dealloc(ip); 1357 if (ret) 1358 goto out; 1359 } 1360 1361 if (!gfs2_is_stuffed(ip)) { 1362 ret = gfs2_file_dealloc(ip); 1363 if (ret) 1364 goto out; 1365 } 1366 1367 /* We're about to clear the bitmap for the dinode, but as soon as we 1368 do, gfs2_create_inode can create another inode at the same block 1369 location and try to set gl_object again. We clear gl_object here so 1370 that subsequent inode creates don't see an old gl_object. */ 1371 glock_clear_object(ip->i_gl, ip); 1372 ret = gfs2_dinode_dealloc(ip); 1373 gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino); 1374 out: 1375 return ret; 1376 } 1377 1378 /* 1379 * evict_linked_inode - evict an inode whose dinode has not been unlinked 1380 * @inode: The inode to evict 1381 */ 1382 static int evict_linked_inode(struct inode *inode) 1383 { 1384 struct super_block *sb = inode->i_sb; 1385 struct gfs2_sbd *sdp = sb->s_fs_info; 1386 struct gfs2_inode *ip = GFS2_I(inode); 1387 struct address_space *metamapping; 1388 int ret; 1389 1390 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 1391 GFS2_LFC_EVICT_INODE); 1392 metamapping = gfs2_glock2aspace(ip->i_gl); 1393 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1394 filemap_fdatawrite(metamapping); 1395 filemap_fdatawait(metamapping); 1396 } 1397 write_inode_now(inode, 1); 1398 gfs2_ail_flush(ip->i_gl, 0); 1399 1400 ret = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1401 if (ret) 1402 return ret; 1403 1404 /* Needs to be done before glock release & also in a transaction */ 1405 truncate_inode_pages(&inode->i_data, 0); 1406 truncate_inode_pages(metamapping, 0); 1407 gfs2_trans_end(sdp); 1408 return 0; 1409 } 1410 1411 /** 1412 * gfs2_evict_inode - Remove an inode from cache 1413 * @inode: The inode to evict 1414 * 1415 * There are three cases to consider: 1416 * 1. i_nlink == 0, we are final opener (and must deallocate) 1417 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1418 * 3. i_nlink > 0 1419 * 1420 * If the fs is read only, then we have to treat all cases as per #3 1421 * since we are unable to do any deallocation. The inode will be 1422 * deallocated by the next read/write node to attempt an allocation 1423 * in the same resource group 1424 * 1425 * We have to (at the moment) hold the inodes main lock to cover 1426 * the gap between unlocking the shared lock on the iopen lock and 1427 * taking the exclusive lock. I'd rather do a shared -> exclusive 1428 * conversion on the iopen lock, but we can change that later. This 1429 * is safe, just less efficient. 1430 */ 1431 1432 static void gfs2_evict_inode(struct inode *inode) 1433 { 1434 struct super_block *sb = inode->i_sb; 1435 struct gfs2_sbd *sdp = sb->s_fs_info; 1436 struct gfs2_inode *ip = GFS2_I(inode); 1437 struct gfs2_holder gh; 1438 int ret; 1439 1440 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) { 1441 clear_inode(inode); 1442 return; 1443 } 1444 1445 if (inode->i_nlink || sb_rdonly(sb)) 1446 goto out; 1447 1448 gfs2_holder_mark_uninitialized(&gh); 1449 ret = evict_should_delete(inode, &gh); 1450 if (ret == SHOULD_DEFER_EVICTION) 1451 goto out; 1452 if (ret == SHOULD_DELETE_DINODE) 1453 ret = evict_unlinked_inode(inode); 1454 else 1455 ret = evict_linked_inode(inode); 1456 1457 if (gfs2_rs_active(&ip->i_res)) 1458 gfs2_rs_deltree(&ip->i_res); 1459 1460 if (gfs2_holder_initialized(&gh)) { 1461 glock_clear_object(ip->i_gl, ip); 1462 gfs2_glock_dq_uninit(&gh); 1463 } 1464 if (ret && ret != GLR_TRYFAILED && ret != -EROFS) 1465 fs_warn(sdp, "gfs2_evict_inode: %d\n", ret); 1466 out: 1467 truncate_inode_pages_final(&inode->i_data); 1468 if (ip->i_qadata) 1469 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0); 1470 gfs2_rs_delete(ip, NULL); 1471 gfs2_ordered_del_inode(ip); 1472 clear_inode(inode); 1473 gfs2_dir_hash_inval(ip); 1474 if (ip->i_gl) { 1475 glock_clear_object(ip->i_gl, ip); 1476 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE); 1477 gfs2_glock_add_to_lru(ip->i_gl); 1478 gfs2_glock_put_eventually(ip->i_gl); 1479 ip->i_gl = NULL; 1480 } 1481 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1482 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1483 1484 glock_clear_object(gl, ip); 1485 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1486 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1487 gfs2_glock_dq(&ip->i_iopen_gh); 1488 } 1489 gfs2_glock_hold(gl); 1490 gfs2_holder_uninit(&ip->i_iopen_gh); 1491 gfs2_glock_put_eventually(gl); 1492 } 1493 } 1494 1495 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1496 { 1497 struct gfs2_inode *ip; 1498 1499 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL); 1500 if (!ip) 1501 return NULL; 1502 ip->i_flags = 0; 1503 ip->i_gl = NULL; 1504 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh); 1505 memset(&ip->i_res, 0, sizeof(ip->i_res)); 1506 RB_CLEAR_NODE(&ip->i_res.rs_node); 1507 ip->i_rahead = 0; 1508 return &ip->i_inode; 1509 } 1510 1511 static void gfs2_free_inode(struct inode *inode) 1512 { 1513 kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode)); 1514 } 1515 1516 extern void free_local_statfs_inodes(struct gfs2_sbd *sdp) 1517 { 1518 struct local_statfs_inode *lsi, *safe; 1519 1520 /* Run through the statfs inodes list to iput and free memory */ 1521 list_for_each_entry_safe(lsi, safe, &sdp->sd_sc_inodes_list, si_list) { 1522 if (lsi->si_jid == sdp->sd_jdesc->jd_jid) 1523 sdp->sd_sc_inode = NULL; /* belongs to this node */ 1524 if (lsi->si_sc_inode) 1525 iput(lsi->si_sc_inode); 1526 list_del(&lsi->si_list); 1527 kfree(lsi); 1528 } 1529 } 1530 1531 extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp, 1532 unsigned int index) 1533 { 1534 struct local_statfs_inode *lsi; 1535 1536 /* Return the local (per node) statfs inode in the 1537 * sdp->sd_sc_inodes_list corresponding to the 'index'. */ 1538 list_for_each_entry(lsi, &sdp->sd_sc_inodes_list, si_list) { 1539 if (lsi->si_jid == index) 1540 return lsi->si_sc_inode; 1541 } 1542 return NULL; 1543 } 1544 1545 const struct super_operations gfs2_super_ops = { 1546 .alloc_inode = gfs2_alloc_inode, 1547 .free_inode = gfs2_free_inode, 1548 .write_inode = gfs2_write_inode, 1549 .dirty_inode = gfs2_dirty_inode, 1550 .evict_inode = gfs2_evict_inode, 1551 .put_super = gfs2_put_super, 1552 .sync_fs = gfs2_sync_fs, 1553 .freeze_super = gfs2_freeze, 1554 .thaw_super = gfs2_unfreeze, 1555 .statfs = gfs2_statfs, 1556 .drop_inode = gfs2_drop_inode, 1557 .show_options = gfs2_show_options, 1558 }; 1559 1560