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 /** 123 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one 124 * @sdp: the filesystem 125 * 126 * Returns: errno 127 */ 128 129 int gfs2_make_fs_rw(struct gfs2_sbd *sdp) 130 { 131 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); 132 struct gfs2_glock *j_gl = ip->i_gl; 133 struct gfs2_log_header_host head; 134 int error; 135 136 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); 137 if (gfs2_withdrawn(sdp)) 138 return -EIO; 139 140 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false); 141 if (error || gfs2_withdrawn(sdp)) 142 return error; 143 144 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 145 gfs2_consist(sdp); 146 return -EIO; 147 } 148 149 /* Initialize some head of the log stuff */ 150 sdp->sd_log_sequence = head.lh_sequence + 1; 151 gfs2_log_pointers_init(sdp, head.lh_blkno); 152 153 error = gfs2_quota_init(sdp); 154 if (!error && !gfs2_withdrawn(sdp)) 155 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 156 return error; 157 } 158 159 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) 160 { 161 const struct gfs2_statfs_change *str = buf; 162 163 sc->sc_total = be64_to_cpu(str->sc_total); 164 sc->sc_free = be64_to_cpu(str->sc_free); 165 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); 166 } 167 168 void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) 169 { 170 struct gfs2_statfs_change *str = buf; 171 172 str->sc_total = cpu_to_be64(sc->sc_total); 173 str->sc_free = cpu_to_be64(sc->sc_free); 174 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); 175 } 176 177 int gfs2_statfs_init(struct gfs2_sbd *sdp) 178 { 179 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 180 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 181 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 182 struct buffer_head *m_bh; 183 struct gfs2_holder gh; 184 int error; 185 186 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 187 &gh); 188 if (error) 189 return error; 190 191 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 192 if (error) 193 goto out; 194 195 if (sdp->sd_args.ar_spectator) { 196 spin_lock(&sdp->sd_statfs_spin); 197 gfs2_statfs_change_in(m_sc, m_bh->b_data + 198 sizeof(struct gfs2_dinode)); 199 spin_unlock(&sdp->sd_statfs_spin); 200 } else { 201 spin_lock(&sdp->sd_statfs_spin); 202 gfs2_statfs_change_in(m_sc, m_bh->b_data + 203 sizeof(struct gfs2_dinode)); 204 gfs2_statfs_change_in(l_sc, sdp->sd_sc_bh->b_data + 205 sizeof(struct gfs2_dinode)); 206 spin_unlock(&sdp->sd_statfs_spin); 207 208 } 209 210 brelse(m_bh); 211 out: 212 gfs2_glock_dq_uninit(&gh); 213 return 0; 214 } 215 216 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, 217 s64 dinodes) 218 { 219 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 220 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 221 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 222 s64 x, y; 223 int need_sync = 0; 224 225 gfs2_trans_add_meta(l_ip->i_gl, sdp->sd_sc_bh); 226 227 spin_lock(&sdp->sd_statfs_spin); 228 l_sc->sc_total += total; 229 l_sc->sc_free += free; 230 l_sc->sc_dinodes += dinodes; 231 gfs2_statfs_change_out(l_sc, sdp->sd_sc_bh->b_data + 232 sizeof(struct gfs2_dinode)); 233 if (sdp->sd_args.ar_statfs_percent) { 234 x = 100 * l_sc->sc_free; 235 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent; 236 if (x >= y || x <= -y) 237 need_sync = 1; 238 } 239 spin_unlock(&sdp->sd_statfs_spin); 240 241 if (need_sync) 242 gfs2_wake_up_statfs(sdp); 243 } 244 245 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh) 246 { 247 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 248 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); 249 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 250 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 251 252 gfs2_trans_add_meta(l_ip->i_gl, sdp->sd_sc_bh); 253 gfs2_trans_add_meta(m_ip->i_gl, m_bh); 254 255 spin_lock(&sdp->sd_statfs_spin); 256 m_sc->sc_total += l_sc->sc_total; 257 m_sc->sc_free += l_sc->sc_free; 258 m_sc->sc_dinodes += l_sc->sc_dinodes; 259 memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); 260 memset(sdp->sd_sc_bh->b_data + sizeof(struct gfs2_dinode), 261 0, sizeof(struct gfs2_statfs_change)); 262 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); 263 spin_unlock(&sdp->sd_statfs_spin); 264 } 265 266 int gfs2_statfs_sync(struct super_block *sb, int type) 267 { 268 struct gfs2_sbd *sdp = sb->s_fs_info; 269 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); 270 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 271 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 272 struct gfs2_holder gh; 273 struct buffer_head *m_bh; 274 int error; 275 276 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, 277 &gh); 278 if (error) 279 goto out; 280 281 error = gfs2_meta_inode_buffer(m_ip, &m_bh); 282 if (error) 283 goto out_unlock; 284 285 spin_lock(&sdp->sd_statfs_spin); 286 gfs2_statfs_change_in(m_sc, m_bh->b_data + 287 sizeof(struct gfs2_dinode)); 288 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { 289 spin_unlock(&sdp->sd_statfs_spin); 290 goto out_bh; 291 } 292 spin_unlock(&sdp->sd_statfs_spin); 293 294 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); 295 if (error) 296 goto out_bh; 297 298 update_statfs(sdp, m_bh); 299 sdp->sd_statfs_force_sync = 0; 300 301 gfs2_trans_end(sdp); 302 303 out_bh: 304 brelse(m_bh); 305 out_unlock: 306 gfs2_glock_dq_uninit(&gh); 307 out: 308 return error; 309 } 310 311 struct lfcc { 312 struct list_head list; 313 struct gfs2_holder gh; 314 }; 315 316 /** 317 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all 318 * journals are clean 319 * @sdp: the file system 320 * 321 * Returns: errno 322 */ 323 324 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp) 325 { 326 struct gfs2_inode *ip; 327 struct gfs2_jdesc *jd; 328 struct lfcc *lfcc; 329 LIST_HEAD(list); 330 struct gfs2_log_header_host lh; 331 int error; 332 333 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 334 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); 335 if (!lfcc) { 336 error = -ENOMEM; 337 goto out; 338 } 339 ip = GFS2_I(jd->jd_inode); 340 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); 341 if (error) { 342 kfree(lfcc); 343 goto out; 344 } 345 list_add(&lfcc->list, &list); 346 } 347 348 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE, 349 LM_FLAG_NOEXP, &sdp->sd_freeze_gh); 350 if (error) 351 goto out; 352 353 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 354 error = gfs2_jdesc_check(jd); 355 if (error) 356 break; 357 error = gfs2_find_jhead(jd, &lh, false); 358 if (error) 359 break; 360 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 361 error = -EBUSY; 362 break; 363 } 364 } 365 366 if (error) 367 gfs2_freeze_unlock(&sdp->sd_freeze_gh); 368 369 out: 370 while (!list_empty(&list)) { 371 lfcc = list_first_entry(&list, struct lfcc, list); 372 list_del(&lfcc->list); 373 gfs2_glock_dq_uninit(&lfcc->gh); 374 kfree(lfcc); 375 } 376 return error; 377 } 378 379 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) 380 { 381 struct gfs2_dinode *str = buf; 382 383 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); 384 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); 385 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); 386 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); 387 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); 388 str->di_mode = cpu_to_be32(ip->i_inode.i_mode); 389 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode)); 390 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode)); 391 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); 392 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode)); 393 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); 394 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); 395 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); 396 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); 397 398 str->di_goal_meta = cpu_to_be64(ip->i_goal); 399 str->di_goal_data = cpu_to_be64(ip->i_goal); 400 str->di_generation = cpu_to_be64(ip->i_generation); 401 402 str->di_flags = cpu_to_be32(ip->i_diskflags); 403 str->di_height = cpu_to_be16(ip->i_height); 404 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && 405 !(ip->i_diskflags & GFS2_DIF_EXHASH) ? 406 GFS2_FORMAT_DE : 0); 407 str->di_depth = cpu_to_be16(ip->i_depth); 408 str->di_entries = cpu_to_be32(ip->i_entries); 409 410 str->di_eattr = cpu_to_be64(ip->i_eattr); 411 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); 412 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); 413 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); 414 } 415 416 /** 417 * gfs2_write_inode - Make sure the inode is stable on the disk 418 * @inode: The inode 419 * @wbc: The writeback control structure 420 * 421 * Returns: errno 422 */ 423 424 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) 425 { 426 struct gfs2_inode *ip = GFS2_I(inode); 427 struct gfs2_sbd *sdp = GFS2_SB(inode); 428 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl); 429 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host); 430 int ret = 0; 431 bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip)); 432 433 if (flush_all) 434 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, 435 GFS2_LOG_HEAD_FLUSH_NORMAL | 436 GFS2_LFC_WRITE_INODE); 437 if (bdi->wb.dirty_exceeded) 438 gfs2_ail1_flush(sdp, wbc); 439 else 440 filemap_fdatawrite(metamapping); 441 if (flush_all) 442 ret = filemap_fdatawait(metamapping); 443 if (ret) 444 mark_inode_dirty_sync(inode); 445 else { 446 spin_lock(&inode->i_lock); 447 if (!(inode->i_flags & I_DIRTY)) 448 gfs2_ordered_del_inode(ip); 449 spin_unlock(&inode->i_lock); 450 } 451 return ret; 452 } 453 454 /** 455 * gfs2_dirty_inode - check for atime updates 456 * @inode: The inode in question 457 * @flags: The type of dirty 458 * 459 * Unfortunately it can be called under any combination of inode 460 * glock and transaction lock, so we have to check carefully. 461 * 462 * At the moment this deals only with atime - it should be possible 463 * to expand that role in future, once a review of the locking has 464 * been carried out. 465 */ 466 467 static void gfs2_dirty_inode(struct inode *inode, int flags) 468 { 469 struct gfs2_inode *ip = GFS2_I(inode); 470 struct gfs2_sbd *sdp = GFS2_SB(inode); 471 struct buffer_head *bh; 472 struct gfs2_holder gh; 473 int need_unlock = 0; 474 int need_endtrans = 0; 475 int ret; 476 477 if (unlikely(gfs2_withdrawn(sdp))) 478 return; 479 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) { 480 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); 481 if (ret) { 482 fs_err(sdp, "dirty_inode: glock %d\n", ret); 483 gfs2_dump_glock(NULL, ip->i_gl, true); 484 return; 485 } 486 need_unlock = 1; 487 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) 488 return; 489 490 if (current->journal_info == NULL) { 491 ret = gfs2_trans_begin(sdp, RES_DINODE, 0); 492 if (ret) { 493 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret); 494 goto out; 495 } 496 need_endtrans = 1; 497 } 498 499 ret = gfs2_meta_inode_buffer(ip, &bh); 500 if (ret == 0) { 501 gfs2_trans_add_meta(ip->i_gl, bh); 502 gfs2_dinode_out(ip, bh->b_data); 503 brelse(bh); 504 } 505 506 if (need_endtrans) 507 gfs2_trans_end(sdp); 508 out: 509 if (need_unlock) 510 gfs2_glock_dq_uninit(&gh); 511 } 512 513 /** 514 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one 515 * @sdp: the filesystem 516 * 517 * Returns: errno 518 */ 519 520 void gfs2_make_fs_ro(struct gfs2_sbd *sdp) 521 { 522 int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); 523 524 gfs2_flush_delete_work(sdp); 525 if (!log_write_allowed && current == sdp->sd_quotad_process) 526 fs_warn(sdp, "The quotad daemon is withdrawing.\n"); 527 else if (sdp->sd_quotad_process) 528 kthread_stop(sdp->sd_quotad_process); 529 sdp->sd_quotad_process = NULL; 530 531 if (!log_write_allowed && current == sdp->sd_logd_process) 532 fs_warn(sdp, "The logd daemon is withdrawing.\n"); 533 else if (sdp->sd_logd_process) 534 kthread_stop(sdp->sd_logd_process); 535 sdp->sd_logd_process = NULL; 536 537 if (log_write_allowed) { 538 gfs2_quota_sync(sdp->sd_vfs, 0); 539 gfs2_statfs_sync(sdp->sd_vfs, 0); 540 541 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN | 542 GFS2_LFC_MAKE_FS_RO); 543 wait_event_timeout(sdp->sd_log_waitq, 544 gfs2_log_is_empty(sdp), 545 HZ * 5); 546 gfs2_assert_warn(sdp, gfs2_log_is_empty(sdp)); 547 } else { 548 wait_event_timeout(sdp->sd_log_waitq, 549 gfs2_log_is_empty(sdp), 550 HZ * 5); 551 } 552 gfs2_quota_cleanup(sdp); 553 554 if (!log_write_allowed) 555 sdp->sd_vfs->s_flags |= SB_RDONLY; 556 } 557 558 /** 559 * gfs2_put_super - Unmount the filesystem 560 * @sb: The VFS superblock 561 * 562 */ 563 564 static void gfs2_put_super(struct super_block *sb) 565 { 566 struct gfs2_sbd *sdp = sb->s_fs_info; 567 struct gfs2_jdesc *jd; 568 569 /* No more recovery requests */ 570 set_bit(SDF_NORECOVERY, &sdp->sd_flags); 571 smp_mb(); 572 573 /* Wait on outstanding recovery */ 574 restart: 575 spin_lock(&sdp->sd_jindex_spin); 576 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 577 if (!test_bit(JDF_RECOVERY, &jd->jd_flags)) 578 continue; 579 spin_unlock(&sdp->sd_jindex_spin); 580 wait_on_bit(&jd->jd_flags, JDF_RECOVERY, 581 TASK_UNINTERRUPTIBLE); 582 goto restart; 583 } 584 spin_unlock(&sdp->sd_jindex_spin); 585 586 if (!sb_rdonly(sb)) { 587 gfs2_make_fs_ro(sdp); 588 } 589 WARN_ON(gfs2_withdrawing(sdp)); 590 591 /* At this point, we're through modifying the disk */ 592 593 /* Release stuff */ 594 595 iput(sdp->sd_jindex); 596 iput(sdp->sd_statfs_inode); 597 iput(sdp->sd_rindex); 598 iput(sdp->sd_quota_inode); 599 600 gfs2_glock_put(sdp->sd_rename_gl); 601 gfs2_glock_put(sdp->sd_freeze_gl); 602 603 if (!sdp->sd_args.ar_spectator) { 604 if (gfs2_holder_initialized(&sdp->sd_journal_gh)) 605 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 606 if (gfs2_holder_initialized(&sdp->sd_jinode_gh)) 607 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 608 brelse(sdp->sd_sc_bh); 609 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 610 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 611 free_local_statfs_inodes(sdp); 612 iput(sdp->sd_qc_inode); 613 } 614 615 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 616 gfs2_clear_rgrpd(sdp); 617 gfs2_jindex_free(sdp); 618 /* Take apart glock structures and buffer lists */ 619 gfs2_gl_hash_clear(sdp); 620 truncate_inode_pages_final(&sdp->sd_aspace); 621 gfs2_delete_debugfs_file(sdp); 622 /* Unmount the locking protocol */ 623 gfs2_lm_unmount(sdp); 624 625 /* At this point, we're through participating in the lockspace */ 626 gfs2_sys_fs_del(sdp); 627 free_sbd(sdp); 628 } 629 630 /** 631 * gfs2_sync_fs - sync the filesystem 632 * @sb: the superblock 633 * @wait: true to wait for completion 634 * 635 * Flushes the log to disk. 636 */ 637 638 static int gfs2_sync_fs(struct super_block *sb, int wait) 639 { 640 struct gfs2_sbd *sdp = sb->s_fs_info; 641 642 gfs2_quota_sync(sb, -1); 643 if (wait) 644 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL | 645 GFS2_LFC_SYNC_FS); 646 return sdp->sd_log_error; 647 } 648 649 void gfs2_freeze_func(struct work_struct *work) 650 { 651 int error; 652 struct gfs2_holder freeze_gh; 653 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work); 654 struct super_block *sb = sdp->sd_vfs; 655 656 atomic_inc(&sb->s_active); 657 error = gfs2_freeze_lock(sdp, &freeze_gh, 0); 658 if (error) { 659 gfs2_assert_withdraw(sdp, 0); 660 } else { 661 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 662 error = thaw_super(sb); 663 if (error) { 664 fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n", 665 error); 666 gfs2_assert_withdraw(sdp, 0); 667 } 668 gfs2_freeze_unlock(&freeze_gh); 669 } 670 deactivate_super(sb); 671 clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags); 672 wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN); 673 return; 674 } 675 676 /** 677 * gfs2_freeze - prevent further writes to the filesystem 678 * @sb: the VFS structure for the filesystem 679 * 680 */ 681 682 static int gfs2_freeze(struct super_block *sb) 683 { 684 struct gfs2_sbd *sdp = sb->s_fs_info; 685 int error; 686 687 mutex_lock(&sdp->sd_freeze_mutex); 688 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) { 689 error = -EBUSY; 690 goto out; 691 } 692 693 for (;;) { 694 if (gfs2_withdrawn(sdp)) { 695 error = -EINVAL; 696 goto out; 697 } 698 699 error = gfs2_lock_fs_check_clean(sdp); 700 if (!error) 701 break; 702 703 if (error == -EBUSY) 704 fs_err(sdp, "waiting for recovery before freeze\n"); 705 else if (error == -EIO) { 706 fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due " 707 "to recovery error.\n"); 708 goto out; 709 } else { 710 fs_err(sdp, "error freezing FS: %d\n", error); 711 } 712 fs_err(sdp, "retrying...\n"); 713 msleep(1000); 714 } 715 set_bit(SDF_FS_FROZEN, &sdp->sd_flags); 716 out: 717 mutex_unlock(&sdp->sd_freeze_mutex); 718 return error; 719 } 720 721 /** 722 * gfs2_unfreeze - reallow writes to the filesystem 723 * @sb: the VFS structure for the filesystem 724 * 725 */ 726 727 static int gfs2_unfreeze(struct super_block *sb) 728 { 729 struct gfs2_sbd *sdp = sb->s_fs_info; 730 731 mutex_lock(&sdp->sd_freeze_mutex); 732 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN || 733 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) { 734 mutex_unlock(&sdp->sd_freeze_mutex); 735 return -EINVAL; 736 } 737 738 gfs2_freeze_unlock(&sdp->sd_freeze_gh); 739 mutex_unlock(&sdp->sd_freeze_mutex); 740 return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE); 741 } 742 743 /** 744 * statfs_slow_fill - fill in the sg for a given RG 745 * @rgd: the RG 746 * @sc: the sc structure 747 * 748 * Returns: 0 on success, -ESTALE if the LVB is invalid 749 */ 750 751 static int statfs_slow_fill(struct gfs2_rgrpd *rgd, 752 struct gfs2_statfs_change_host *sc) 753 { 754 gfs2_rgrp_verify(rgd); 755 sc->sc_total += rgd->rd_data; 756 sc->sc_free += rgd->rd_free; 757 sc->sc_dinodes += rgd->rd_dinodes; 758 return 0; 759 } 760 761 /** 762 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking 763 * @sdp: the filesystem 764 * @sc: the sc info that will be returned 765 * 766 * Any error (other than a signal) will cause this routine to fall back 767 * to the synchronous version. 768 * 769 * FIXME: This really shouldn't busy wait like this. 770 * 771 * Returns: errno 772 */ 773 774 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 775 { 776 struct gfs2_rgrpd *rgd_next; 777 struct gfs2_holder *gha, *gh; 778 unsigned int slots = 64; 779 unsigned int x; 780 int done; 781 int error = 0, err; 782 783 memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); 784 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL); 785 if (!gha) 786 return -ENOMEM; 787 for (x = 0; x < slots; x++) 788 gfs2_holder_mark_uninitialized(gha + x); 789 790 rgd_next = gfs2_rgrpd_get_first(sdp); 791 792 for (;;) { 793 done = 1; 794 795 for (x = 0; x < slots; x++) { 796 gh = gha + x; 797 798 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) { 799 err = gfs2_glock_wait(gh); 800 if (err) { 801 gfs2_holder_uninit(gh); 802 error = err; 803 } else { 804 if (!error) { 805 struct gfs2_rgrpd *rgd = 806 gfs2_glock2rgrp(gh->gh_gl); 807 808 error = statfs_slow_fill(rgd, sc); 809 } 810 gfs2_glock_dq_uninit(gh); 811 } 812 } 813 814 if (gfs2_holder_initialized(gh)) 815 done = 0; 816 else if (rgd_next && !error) { 817 error = gfs2_glock_nq_init(rgd_next->rd_gl, 818 LM_ST_SHARED, 819 GL_ASYNC, 820 gh); 821 rgd_next = gfs2_rgrpd_get_next(rgd_next); 822 done = 0; 823 } 824 825 if (signal_pending(current)) 826 error = -ERESTARTSYS; 827 } 828 829 if (done) 830 break; 831 832 yield(); 833 } 834 835 kfree(gha); 836 return error; 837 } 838 839 /** 840 * gfs2_statfs_i - Do a statfs 841 * @sdp: the filesystem 842 * @sc: the sc structure 843 * 844 * Returns: errno 845 */ 846 847 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) 848 { 849 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; 850 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; 851 852 spin_lock(&sdp->sd_statfs_spin); 853 854 *sc = *m_sc; 855 sc->sc_total += l_sc->sc_total; 856 sc->sc_free += l_sc->sc_free; 857 sc->sc_dinodes += l_sc->sc_dinodes; 858 859 spin_unlock(&sdp->sd_statfs_spin); 860 861 if (sc->sc_free < 0) 862 sc->sc_free = 0; 863 if (sc->sc_free > sc->sc_total) 864 sc->sc_free = sc->sc_total; 865 if (sc->sc_dinodes < 0) 866 sc->sc_dinodes = 0; 867 868 return 0; 869 } 870 871 /** 872 * gfs2_statfs - Gather and return stats about the filesystem 873 * @dentry: The name of the link 874 * @buf: The buffer 875 * 876 * Returns: 0 on success or error code 877 */ 878 879 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) 880 { 881 struct super_block *sb = dentry->d_sb; 882 struct gfs2_sbd *sdp = sb->s_fs_info; 883 struct gfs2_statfs_change_host sc; 884 int error; 885 886 error = gfs2_rindex_update(sdp); 887 if (error) 888 return error; 889 890 if (gfs2_tune_get(sdp, gt_statfs_slow)) 891 error = gfs2_statfs_slow(sdp, &sc); 892 else 893 error = gfs2_statfs_i(sdp, &sc); 894 895 if (error) 896 return error; 897 898 buf->f_type = GFS2_MAGIC; 899 buf->f_bsize = sdp->sd_sb.sb_bsize; 900 buf->f_blocks = sc.sc_total; 901 buf->f_bfree = sc.sc_free; 902 buf->f_bavail = sc.sc_free; 903 buf->f_files = sc.sc_dinodes + sc.sc_free; 904 buf->f_ffree = sc.sc_free; 905 buf->f_namelen = GFS2_FNAMESIZE; 906 907 return 0; 908 } 909 910 /** 911 * gfs2_drop_inode - Drop an inode (test for remote unlink) 912 * @inode: The inode to drop 913 * 914 * If we've received a callback on an iopen lock then it's because a 915 * remote node tried to deallocate the inode but failed due to this node 916 * still having the inode open. Here we mark the link count zero 917 * since we know that it must have reached zero if the GLF_DEMOTE flag 918 * is set on the iopen glock. If we didn't do a disk read since the 919 * remote node removed the final link then we might otherwise miss 920 * this event. This check ensures that this node will deallocate the 921 * inode's blocks, or alternatively pass the baton on to another 922 * node for later deallocation. 923 */ 924 925 static int gfs2_drop_inode(struct inode *inode) 926 { 927 struct gfs2_inode *ip = GFS2_I(inode); 928 929 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && 930 inode->i_nlink && 931 gfs2_holder_initialized(&ip->i_iopen_gh)) { 932 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 933 if (test_bit(GLF_DEMOTE, &gl->gl_flags)) 934 clear_nlink(inode); 935 } 936 937 /* 938 * When under memory pressure when an inode's link count has dropped to 939 * zero, defer deleting the inode to the delete workqueue. This avoids 940 * calling into DLM under memory pressure, which can deadlock. 941 */ 942 if (!inode->i_nlink && 943 unlikely(current->flags & PF_MEMALLOC) && 944 gfs2_holder_initialized(&ip->i_iopen_gh)) { 945 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 946 947 gfs2_glock_hold(gl); 948 if (!gfs2_queue_delete_work(gl, 0)) 949 gfs2_glock_queue_put(gl); 950 return 0; 951 } 952 953 return generic_drop_inode(inode); 954 } 955 956 static int is_ancestor(const struct dentry *d1, const struct dentry *d2) 957 { 958 do { 959 if (d1 == d2) 960 return 1; 961 d1 = d1->d_parent; 962 } while (!IS_ROOT(d1)); 963 return 0; 964 } 965 966 /** 967 * gfs2_show_options - Show mount options for /proc/mounts 968 * @s: seq_file structure 969 * @root: root of this (sub)tree 970 * 971 * Returns: 0 on success or error code 972 */ 973 974 static int gfs2_show_options(struct seq_file *s, struct dentry *root) 975 { 976 struct gfs2_sbd *sdp = root->d_sb->s_fs_info; 977 struct gfs2_args *args = &sdp->sd_args; 978 int val; 979 980 if (is_ancestor(root, sdp->sd_master_dir)) 981 seq_puts(s, ",meta"); 982 if (args->ar_lockproto[0]) 983 seq_show_option(s, "lockproto", args->ar_lockproto); 984 if (args->ar_locktable[0]) 985 seq_show_option(s, "locktable", args->ar_locktable); 986 if (args->ar_hostdata[0]) 987 seq_show_option(s, "hostdata", args->ar_hostdata); 988 if (args->ar_spectator) 989 seq_puts(s, ",spectator"); 990 if (args->ar_localflocks) 991 seq_puts(s, ",localflocks"); 992 if (args->ar_debug) 993 seq_puts(s, ",debug"); 994 if (args->ar_posix_acl) 995 seq_puts(s, ",acl"); 996 if (args->ar_quota != GFS2_QUOTA_DEFAULT) { 997 char *state; 998 switch (args->ar_quota) { 999 case GFS2_QUOTA_OFF: 1000 state = "off"; 1001 break; 1002 case GFS2_QUOTA_ACCOUNT: 1003 state = "account"; 1004 break; 1005 case GFS2_QUOTA_ON: 1006 state = "on"; 1007 break; 1008 default: 1009 state = "unknown"; 1010 break; 1011 } 1012 seq_printf(s, ",quota=%s", state); 1013 } 1014 if (args->ar_suiddir) 1015 seq_puts(s, ",suiddir"); 1016 if (args->ar_data != GFS2_DATA_DEFAULT) { 1017 char *state; 1018 switch (args->ar_data) { 1019 case GFS2_DATA_WRITEBACK: 1020 state = "writeback"; 1021 break; 1022 case GFS2_DATA_ORDERED: 1023 state = "ordered"; 1024 break; 1025 default: 1026 state = "unknown"; 1027 break; 1028 } 1029 seq_printf(s, ",data=%s", state); 1030 } 1031 if (args->ar_discard) 1032 seq_puts(s, ",discard"); 1033 val = sdp->sd_tune.gt_logd_secs; 1034 if (val != 30) 1035 seq_printf(s, ",commit=%d", val); 1036 val = sdp->sd_tune.gt_statfs_quantum; 1037 if (val != 30) 1038 seq_printf(s, ",statfs_quantum=%d", val); 1039 else if (sdp->sd_tune.gt_statfs_slow) 1040 seq_puts(s, ",statfs_quantum=0"); 1041 val = sdp->sd_tune.gt_quota_quantum; 1042 if (val != 60) 1043 seq_printf(s, ",quota_quantum=%d", val); 1044 if (args->ar_statfs_percent) 1045 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent); 1046 if (args->ar_errors != GFS2_ERRORS_DEFAULT) { 1047 const char *state; 1048 1049 switch (args->ar_errors) { 1050 case GFS2_ERRORS_WITHDRAW: 1051 state = "withdraw"; 1052 break; 1053 case GFS2_ERRORS_PANIC: 1054 state = "panic"; 1055 break; 1056 default: 1057 state = "unknown"; 1058 break; 1059 } 1060 seq_printf(s, ",errors=%s", state); 1061 } 1062 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags)) 1063 seq_puts(s, ",nobarrier"); 1064 if (test_bit(SDF_DEMOTE, &sdp->sd_flags)) 1065 seq_puts(s, ",demote_interface_used"); 1066 if (args->ar_rgrplvb) 1067 seq_puts(s, ",rgrplvb"); 1068 if (args->ar_loccookie) 1069 seq_puts(s, ",loccookie"); 1070 return 0; 1071 } 1072 1073 static void gfs2_final_release_pages(struct gfs2_inode *ip) 1074 { 1075 struct inode *inode = &ip->i_inode; 1076 struct gfs2_glock *gl = ip->i_gl; 1077 1078 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0); 1079 truncate_inode_pages(&inode->i_data, 0); 1080 1081 if (atomic_read(&gl->gl_revokes) == 0) { 1082 clear_bit(GLF_LFLUSH, &gl->gl_flags); 1083 clear_bit(GLF_DIRTY, &gl->gl_flags); 1084 } 1085 } 1086 1087 static int gfs2_dinode_dealloc(struct gfs2_inode *ip) 1088 { 1089 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1090 struct gfs2_rgrpd *rgd; 1091 struct gfs2_holder gh; 1092 int error; 1093 1094 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { 1095 gfs2_consist_inode(ip); 1096 return -EIO; 1097 } 1098 1099 error = gfs2_rindex_update(sdp); 1100 if (error) 1101 return error; 1102 1103 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); 1104 if (error) 1105 return error; 1106 1107 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); 1108 if (!rgd) { 1109 gfs2_consist_inode(ip); 1110 error = -EIO; 1111 goto out_qs; 1112 } 1113 1114 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 1115 LM_FLAG_NODE_SCOPE, &gh); 1116 if (error) 1117 goto out_qs; 1118 1119 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1120 sdp->sd_jdesc->jd_blocks); 1121 if (error) 1122 goto out_rg_gunlock; 1123 1124 gfs2_free_di(rgd, ip); 1125 1126 gfs2_final_release_pages(ip); 1127 1128 gfs2_trans_end(sdp); 1129 1130 out_rg_gunlock: 1131 gfs2_glock_dq_uninit(&gh); 1132 out_qs: 1133 gfs2_quota_unhold(ip); 1134 return error; 1135 } 1136 1137 /** 1138 * gfs2_glock_put_eventually 1139 * @gl: The glock to put 1140 * 1141 * When under memory pressure, trigger a deferred glock put to make sure we 1142 * won't call into DLM and deadlock. Otherwise, put the glock directly. 1143 */ 1144 1145 static void gfs2_glock_put_eventually(struct gfs2_glock *gl) 1146 { 1147 if (current->flags & PF_MEMALLOC) 1148 gfs2_glock_queue_put(gl); 1149 else 1150 gfs2_glock_put(gl); 1151 } 1152 1153 static bool gfs2_upgrade_iopen_glock(struct inode *inode) 1154 { 1155 struct gfs2_inode *ip = GFS2_I(inode); 1156 struct gfs2_sbd *sdp = GFS2_SB(inode); 1157 struct gfs2_holder *gh = &ip->i_iopen_gh; 1158 long timeout = 5 * HZ; 1159 int error; 1160 1161 gh->gh_flags |= GL_NOCACHE; 1162 gfs2_glock_dq_wait(gh); 1163 1164 /* 1165 * If there are no other lock holders, we'll get the lock immediately. 1166 * Otherwise, the other nodes holding the lock will be notified about 1167 * our locking request. If they don't have the inode open, they'll 1168 * evict the cached inode and release the lock. Otherwise, if they 1169 * poke the inode glock, we'll take this as an indication that they 1170 * still need the iopen glock and that they'll take care of deleting 1171 * the inode when they're done. As a last resort, if another node 1172 * keeps holding the iopen glock without showing any activity on the 1173 * inode glock, we'll eventually time out. 1174 * 1175 * Note that we're passing the LM_FLAG_TRY_1CB flag to the first 1176 * locking request as an optimization to notify lock holders as soon as 1177 * possible. Without that flag, they'd be notified implicitly by the 1178 * second locking request. 1179 */ 1180 1181 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh); 1182 error = gfs2_glock_nq(gh); 1183 if (error != GLR_TRYFAILED) 1184 return !error; 1185 1186 gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh); 1187 error = gfs2_glock_nq(gh); 1188 if (error) 1189 return false; 1190 1191 timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait, 1192 !test_bit(HIF_WAIT, &gh->gh_iflags) || 1193 test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags), 1194 timeout); 1195 if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) { 1196 gfs2_glock_dq(gh); 1197 return false; 1198 } 1199 return true; 1200 } 1201 1202 /** 1203 * evict_should_delete - determine whether the inode is eligible for deletion 1204 * @inode: The inode to evict 1205 * @gh: The glock holder structure 1206 * 1207 * This function determines whether the evicted inode is eligible to be deleted 1208 * and locks the inode glock. 1209 * 1210 * Returns: the fate of the dinode 1211 */ 1212 static enum dinode_demise evict_should_delete(struct inode *inode, 1213 struct gfs2_holder *gh) 1214 { 1215 struct gfs2_inode *ip = GFS2_I(inode); 1216 struct super_block *sb = inode->i_sb; 1217 struct gfs2_sbd *sdp = sb->s_fs_info; 1218 int ret; 1219 1220 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) { 1221 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl)); 1222 goto should_delete; 1223 } 1224 1225 if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags)) 1226 return SHOULD_DEFER_EVICTION; 1227 1228 /* Deletes should never happen under memory pressure anymore. */ 1229 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC)) 1230 return SHOULD_DEFER_EVICTION; 1231 1232 /* Must not read inode block until block type has been verified */ 1233 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh); 1234 if (unlikely(ret)) { 1235 glock_clear_object(ip->i_iopen_gh.gh_gl, ip); 1236 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1237 gfs2_glock_dq_uninit(&ip->i_iopen_gh); 1238 return SHOULD_DEFER_EVICTION; 1239 } 1240 1241 if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino)) 1242 return SHOULD_NOT_DELETE_DINODE; 1243 ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED); 1244 if (ret) 1245 return SHOULD_NOT_DELETE_DINODE; 1246 1247 ret = gfs2_instantiate(gh); 1248 if (ret) 1249 return SHOULD_NOT_DELETE_DINODE; 1250 1251 /* 1252 * The inode may have been recreated in the meantime. 1253 */ 1254 if (inode->i_nlink) 1255 return SHOULD_NOT_DELETE_DINODE; 1256 1257 should_delete: 1258 if (gfs2_holder_initialized(&ip->i_iopen_gh) && 1259 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1260 if (!gfs2_upgrade_iopen_glock(inode)) { 1261 gfs2_holder_uninit(&ip->i_iopen_gh); 1262 return SHOULD_NOT_DELETE_DINODE; 1263 } 1264 } 1265 return SHOULD_DELETE_DINODE; 1266 } 1267 1268 /** 1269 * evict_unlinked_inode - delete the pieces of an unlinked evicted inode 1270 * @inode: The inode to evict 1271 */ 1272 static int evict_unlinked_inode(struct inode *inode) 1273 { 1274 struct gfs2_inode *ip = GFS2_I(inode); 1275 int ret; 1276 1277 if (S_ISDIR(inode->i_mode) && 1278 (ip->i_diskflags & GFS2_DIF_EXHASH)) { 1279 ret = gfs2_dir_exhash_dealloc(ip); 1280 if (ret) 1281 goto out; 1282 } 1283 1284 if (ip->i_eattr) { 1285 ret = gfs2_ea_dealloc(ip); 1286 if (ret) 1287 goto out; 1288 } 1289 1290 if (!gfs2_is_stuffed(ip)) { 1291 ret = gfs2_file_dealloc(ip); 1292 if (ret) 1293 goto out; 1294 } 1295 1296 /* We're about to clear the bitmap for the dinode, but as soon as we 1297 do, gfs2_create_inode can create another inode at the same block 1298 location and try to set gl_object again. We clear gl_object here so 1299 that subsequent inode creates don't see an old gl_object. */ 1300 glock_clear_object(ip->i_gl, ip); 1301 ret = gfs2_dinode_dealloc(ip); 1302 gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino); 1303 out: 1304 return ret; 1305 } 1306 1307 /* 1308 * evict_linked_inode - evict an inode whose dinode has not been unlinked 1309 * @inode: The inode to evict 1310 */ 1311 static int evict_linked_inode(struct inode *inode) 1312 { 1313 struct super_block *sb = inode->i_sb; 1314 struct gfs2_sbd *sdp = sb->s_fs_info; 1315 struct gfs2_inode *ip = GFS2_I(inode); 1316 struct address_space *metamapping; 1317 int ret; 1318 1319 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL | 1320 GFS2_LFC_EVICT_INODE); 1321 metamapping = gfs2_glock2aspace(ip->i_gl); 1322 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) { 1323 filemap_fdatawrite(metamapping); 1324 filemap_fdatawait(metamapping); 1325 } 1326 write_inode_now(inode, 1); 1327 gfs2_ail_flush(ip->i_gl, 0); 1328 1329 ret = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks); 1330 if (ret) 1331 return ret; 1332 1333 /* Needs to be done before glock release & also in a transaction */ 1334 truncate_inode_pages(&inode->i_data, 0); 1335 truncate_inode_pages(metamapping, 0); 1336 gfs2_trans_end(sdp); 1337 return 0; 1338 } 1339 1340 /** 1341 * gfs2_evict_inode - Remove an inode from cache 1342 * @inode: The inode to evict 1343 * 1344 * There are three cases to consider: 1345 * 1. i_nlink == 0, we are final opener (and must deallocate) 1346 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) 1347 * 3. i_nlink > 0 1348 * 1349 * If the fs is read only, then we have to treat all cases as per #3 1350 * since we are unable to do any deallocation. The inode will be 1351 * deallocated by the next read/write node to attempt an allocation 1352 * in the same resource group 1353 * 1354 * We have to (at the moment) hold the inodes main lock to cover 1355 * the gap between unlocking the shared lock on the iopen lock and 1356 * taking the exclusive lock. I'd rather do a shared -> exclusive 1357 * conversion on the iopen lock, but we can change that later. This 1358 * is safe, just less efficient. 1359 */ 1360 1361 static void gfs2_evict_inode(struct inode *inode) 1362 { 1363 struct super_block *sb = inode->i_sb; 1364 struct gfs2_sbd *sdp = sb->s_fs_info; 1365 struct gfs2_inode *ip = GFS2_I(inode); 1366 struct gfs2_holder gh; 1367 int ret; 1368 1369 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) { 1370 clear_inode(inode); 1371 return; 1372 } 1373 1374 if (inode->i_nlink || sb_rdonly(sb)) 1375 goto out; 1376 1377 gfs2_holder_mark_uninitialized(&gh); 1378 ret = evict_should_delete(inode, &gh); 1379 if (ret == SHOULD_DEFER_EVICTION) 1380 goto out; 1381 if (ret == SHOULD_DELETE_DINODE) 1382 ret = evict_unlinked_inode(inode); 1383 else 1384 ret = evict_linked_inode(inode); 1385 1386 if (gfs2_rs_active(&ip->i_res)) 1387 gfs2_rs_deltree(&ip->i_res); 1388 1389 if (gfs2_holder_initialized(&gh)) { 1390 glock_clear_object(ip->i_gl, ip); 1391 gfs2_glock_dq_uninit(&gh); 1392 } 1393 if (ret && ret != GLR_TRYFAILED && ret != -EROFS) 1394 fs_warn(sdp, "gfs2_evict_inode: %d\n", ret); 1395 out: 1396 truncate_inode_pages_final(&inode->i_data); 1397 if (ip->i_qadata) 1398 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0); 1399 gfs2_rs_delete(ip, NULL); 1400 gfs2_ordered_del_inode(ip); 1401 clear_inode(inode); 1402 gfs2_dir_hash_inval(ip); 1403 if (gfs2_holder_initialized(&ip->i_iopen_gh)) { 1404 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl; 1405 1406 glock_clear_object(gl, ip); 1407 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) { 1408 ip->i_iopen_gh.gh_flags |= GL_NOCACHE; 1409 gfs2_glock_dq(&ip->i_iopen_gh); 1410 } 1411 gfs2_glock_hold(gl); 1412 gfs2_holder_uninit(&ip->i_iopen_gh); 1413 gfs2_glock_put_eventually(gl); 1414 } 1415 if (ip->i_gl) { 1416 glock_clear_object(ip->i_gl, ip); 1417 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE); 1418 gfs2_glock_add_to_lru(ip->i_gl); 1419 gfs2_glock_put_eventually(ip->i_gl); 1420 ip->i_gl = NULL; 1421 } 1422 } 1423 1424 static struct inode *gfs2_alloc_inode(struct super_block *sb) 1425 { 1426 struct gfs2_inode *ip; 1427 1428 ip = alloc_inode_sb(sb, gfs2_inode_cachep, GFP_KERNEL); 1429 if (!ip) 1430 return NULL; 1431 ip->i_flags = 0; 1432 ip->i_gl = NULL; 1433 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh); 1434 memset(&ip->i_res, 0, sizeof(ip->i_res)); 1435 RB_CLEAR_NODE(&ip->i_res.rs_node); 1436 ip->i_rahead = 0; 1437 return &ip->i_inode; 1438 } 1439 1440 static void gfs2_free_inode(struct inode *inode) 1441 { 1442 kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode)); 1443 } 1444 1445 extern void free_local_statfs_inodes(struct gfs2_sbd *sdp) 1446 { 1447 struct local_statfs_inode *lsi, *safe; 1448 1449 /* Run through the statfs inodes list to iput and free memory */ 1450 list_for_each_entry_safe(lsi, safe, &sdp->sd_sc_inodes_list, si_list) { 1451 if (lsi->si_jid == sdp->sd_jdesc->jd_jid) 1452 sdp->sd_sc_inode = NULL; /* belongs to this node */ 1453 if (lsi->si_sc_inode) 1454 iput(lsi->si_sc_inode); 1455 list_del(&lsi->si_list); 1456 kfree(lsi); 1457 } 1458 } 1459 1460 extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp, 1461 unsigned int index) 1462 { 1463 struct local_statfs_inode *lsi; 1464 1465 /* Return the local (per node) statfs inode in the 1466 * sdp->sd_sc_inodes_list corresponding to the 'index'. */ 1467 list_for_each_entry(lsi, &sdp->sd_sc_inodes_list, si_list) { 1468 if (lsi->si_jid == index) 1469 return lsi->si_sc_inode; 1470 } 1471 return NULL; 1472 } 1473 1474 const struct super_operations gfs2_super_ops = { 1475 .alloc_inode = gfs2_alloc_inode, 1476 .free_inode = gfs2_free_inode, 1477 .write_inode = gfs2_write_inode, 1478 .dirty_inode = gfs2_dirty_inode, 1479 .evict_inode = gfs2_evict_inode, 1480 .put_super = gfs2_put_super, 1481 .sync_fs = gfs2_sync_fs, 1482 .freeze_super = gfs2_freeze, 1483 .thaw_super = gfs2_unfreeze, 1484 .statfs = gfs2_statfs, 1485 .drop_inode = gfs2_drop_inode, 1486 .show_options = gfs2_show_options, 1487 }; 1488 1489