PageRenderTime 78ms CodeModel.GetById 23ms app.highlight 47ms RepoModel.GetById 0ms app.codeStats 1ms

/fs/gfs2/super.c

https://bitbucket.org/emiliolopez/linux
C | 1755 lines | 1326 code | 225 blank | 204 comment | 211 complexity | 87de66e4cc91a16ce6b62dfb467ff791 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12#include <linux/bio.h>
  13#include <linux/sched/signal.h>
  14#include <linux/slab.h>
  15#include <linux/spinlock.h>
  16#include <linux/completion.h>
  17#include <linux/buffer_head.h>
  18#include <linux/statfs.h>
  19#include <linux/seq_file.h>
  20#include <linux/mount.h>
  21#include <linux/kthread.h>
  22#include <linux/delay.h>
  23#include <linux/gfs2_ondisk.h>
  24#include <linux/crc32.h>
  25#include <linux/time.h>
  26#include <linux/wait.h>
  27#include <linux/writeback.h>
  28#include <linux/backing-dev.h>
  29#include <linux/kernel.h>
  30
  31#include "gfs2.h"
  32#include "incore.h"
  33#include "bmap.h"
  34#include "dir.h"
  35#include "glock.h"
  36#include "glops.h"
  37#include "inode.h"
  38#include "log.h"
  39#include "meta_io.h"
  40#include "quota.h"
  41#include "recovery.h"
  42#include "rgrp.h"
  43#include "super.h"
  44#include "trans.h"
  45#include "util.h"
  46#include "sys.h"
  47#include "xattr.h"
  48
  49#define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
  50
  51enum {
  52	Opt_lockproto,
  53	Opt_locktable,
  54	Opt_hostdata,
  55	Opt_spectator,
  56	Opt_ignore_local_fs,
  57	Opt_localflocks,
  58	Opt_localcaching,
  59	Opt_debug,
  60	Opt_nodebug,
  61	Opt_upgrade,
  62	Opt_acl,
  63	Opt_noacl,
  64	Opt_quota_off,
  65	Opt_quota_account,
  66	Opt_quota_on,
  67	Opt_quota,
  68	Opt_noquota,
  69	Opt_suiddir,
  70	Opt_nosuiddir,
  71	Opt_data_writeback,
  72	Opt_data_ordered,
  73	Opt_meta,
  74	Opt_discard,
  75	Opt_nodiscard,
  76	Opt_commit,
  77	Opt_err_withdraw,
  78	Opt_err_panic,
  79	Opt_statfs_quantum,
  80	Opt_statfs_percent,
  81	Opt_quota_quantum,
  82	Opt_barrier,
  83	Opt_nobarrier,
  84	Opt_rgrplvb,
  85	Opt_norgrplvb,
  86	Opt_loccookie,
  87	Opt_noloccookie,
  88	Opt_error,
  89};
  90
  91static const match_table_t tokens = {
  92	{Opt_lockproto, "lockproto=%s"},
  93	{Opt_locktable, "locktable=%s"},
  94	{Opt_hostdata, "hostdata=%s"},
  95	{Opt_spectator, "spectator"},
  96	{Opt_spectator, "norecovery"},
  97	{Opt_ignore_local_fs, "ignore_local_fs"},
  98	{Opt_localflocks, "localflocks"},
  99	{Opt_localcaching, "localcaching"},
 100	{Opt_debug, "debug"},
 101	{Opt_nodebug, "nodebug"},
 102	{Opt_upgrade, "upgrade"},
 103	{Opt_acl, "acl"},
 104	{Opt_noacl, "noacl"},
 105	{Opt_quota_off, "quota=off"},
 106	{Opt_quota_account, "quota=account"},
 107	{Opt_quota_on, "quota=on"},
 108	{Opt_quota, "quota"},
 109	{Opt_noquota, "noquota"},
 110	{Opt_suiddir, "suiddir"},
 111	{Opt_nosuiddir, "nosuiddir"},
 112	{Opt_data_writeback, "data=writeback"},
 113	{Opt_data_ordered, "data=ordered"},
 114	{Opt_meta, "meta"},
 115	{Opt_discard, "discard"},
 116	{Opt_nodiscard, "nodiscard"},
 117	{Opt_commit, "commit=%d"},
 118	{Opt_err_withdraw, "errors=withdraw"},
 119	{Opt_err_panic, "errors=panic"},
 120	{Opt_statfs_quantum, "statfs_quantum=%d"},
 121	{Opt_statfs_percent, "statfs_percent=%d"},
 122	{Opt_quota_quantum, "quota_quantum=%d"},
 123	{Opt_barrier, "barrier"},
 124	{Opt_nobarrier, "nobarrier"},
 125	{Opt_rgrplvb, "rgrplvb"},
 126	{Opt_norgrplvb, "norgrplvb"},
 127	{Opt_loccookie, "loccookie"},
 128	{Opt_noloccookie, "noloccookie"},
 129	{Opt_error, NULL}
 130};
 131
 132/**
 133 * gfs2_mount_args - Parse mount options
 134 * @args: The structure into which the parsed options will be written
 135 * @options: The options to parse
 136 *
 137 * Return: errno
 138 */
 139
 140int gfs2_mount_args(struct gfs2_args *args, char *options)
 141{
 142	char *o;
 143	int token;
 144	substring_t tmp[MAX_OPT_ARGS];
 145	int rv;
 146
 147	/* Split the options into tokens with the "," character and
 148	   process them */
 149
 150	while (1) {
 151		o = strsep(&options, ",");
 152		if (o == NULL)
 153			break;
 154		if (*o == '\0')
 155			continue;
 156
 157		token = match_token(o, tokens, tmp);
 158		switch (token) {
 159		case Opt_lockproto:
 160			match_strlcpy(args->ar_lockproto, &tmp[0],
 161				      GFS2_LOCKNAME_LEN);
 162			break;
 163		case Opt_locktable:
 164			match_strlcpy(args->ar_locktable, &tmp[0],
 165				      GFS2_LOCKNAME_LEN);
 166			break;
 167		case Opt_hostdata:
 168			match_strlcpy(args->ar_hostdata, &tmp[0],
 169				      GFS2_LOCKNAME_LEN);
 170			break;
 171		case Opt_spectator:
 172			args->ar_spectator = 1;
 173			break;
 174		case Opt_ignore_local_fs:
 175			/* Retained for backwards compat only */
 176			break;
 177		case Opt_localflocks:
 178			args->ar_localflocks = 1;
 179			break;
 180		case Opt_localcaching:
 181			/* Retained for backwards compat only */
 182			break;
 183		case Opt_debug:
 184			if (args->ar_errors == GFS2_ERRORS_PANIC) {
 185				pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
 186				return -EINVAL;
 187			}
 188			args->ar_debug = 1;
 189			break;
 190		case Opt_nodebug:
 191			args->ar_debug = 0;
 192			break;
 193		case Opt_upgrade:
 194			/* Retained for backwards compat only */
 195			break;
 196		case Opt_acl:
 197			args->ar_posix_acl = 1;
 198			break;
 199		case Opt_noacl:
 200			args->ar_posix_acl = 0;
 201			break;
 202		case Opt_quota_off:
 203		case Opt_noquota:
 204			args->ar_quota = GFS2_QUOTA_OFF;
 205			break;
 206		case Opt_quota_account:
 207			args->ar_quota = GFS2_QUOTA_ACCOUNT;
 208			break;
 209		case Opt_quota_on:
 210		case Opt_quota:
 211			args->ar_quota = GFS2_QUOTA_ON;
 212			break;
 213		case Opt_suiddir:
 214			args->ar_suiddir = 1;
 215			break;
 216		case Opt_nosuiddir:
 217			args->ar_suiddir = 0;
 218			break;
 219		case Opt_data_writeback:
 220			args->ar_data = GFS2_DATA_WRITEBACK;
 221			break;
 222		case Opt_data_ordered:
 223			args->ar_data = GFS2_DATA_ORDERED;
 224			break;
 225		case Opt_meta:
 226			args->ar_meta = 1;
 227			break;
 228		case Opt_discard:
 229			args->ar_discard = 1;
 230			break;
 231		case Opt_nodiscard:
 232			args->ar_discard = 0;
 233			break;
 234		case Opt_commit:
 235			rv = match_int(&tmp[0], &args->ar_commit);
 236			if (rv || args->ar_commit <= 0) {
 237				pr_warn("commit mount option requires a positive numeric argument\n");
 238				return rv ? rv : -EINVAL;
 239			}
 240			break;
 241		case Opt_statfs_quantum:
 242			rv = match_int(&tmp[0], &args->ar_statfs_quantum);
 243			if (rv || args->ar_statfs_quantum < 0) {
 244				pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
 245				return rv ? rv : -EINVAL;
 246			}
 247			break;
 248		case Opt_quota_quantum:
 249			rv = match_int(&tmp[0], &args->ar_quota_quantum);
 250			if (rv || args->ar_quota_quantum <= 0) {
 251				pr_warn("quota_quantum mount option requires a positive numeric argument\n");
 252				return rv ? rv : -EINVAL;
 253			}
 254			break;
 255		case Opt_statfs_percent:
 256			rv = match_int(&tmp[0], &args->ar_statfs_percent);
 257			if (rv || args->ar_statfs_percent < 0 ||
 258			    args->ar_statfs_percent > 100) {
 259				pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
 260				return rv ? rv : -EINVAL;
 261			}
 262			break;
 263		case Opt_err_withdraw:
 264			args->ar_errors = GFS2_ERRORS_WITHDRAW;
 265			break;
 266		case Opt_err_panic:
 267			if (args->ar_debug) {
 268				pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
 269				return -EINVAL;
 270			}
 271			args->ar_errors = GFS2_ERRORS_PANIC;
 272			break;
 273		case Opt_barrier:
 274			args->ar_nobarrier = 0;
 275			break;
 276		case Opt_nobarrier:
 277			args->ar_nobarrier = 1;
 278			break;
 279		case Opt_rgrplvb:
 280			args->ar_rgrplvb = 1;
 281			break;
 282		case Opt_norgrplvb:
 283			args->ar_rgrplvb = 0;
 284			break;
 285		case Opt_loccookie:
 286			args->ar_loccookie = 1;
 287			break;
 288		case Opt_noloccookie:
 289			args->ar_loccookie = 0;
 290			break;
 291		case Opt_error:
 292		default:
 293			pr_warn("invalid mount option: %s\n", o);
 294			return -EINVAL;
 295		}
 296	}
 297
 298	return 0;
 299}
 300
 301/**
 302 * gfs2_jindex_free - Clear all the journal index information
 303 * @sdp: The GFS2 superblock
 304 *
 305 */
 306
 307void gfs2_jindex_free(struct gfs2_sbd *sdp)
 308{
 309	struct list_head list;
 310	struct gfs2_jdesc *jd;
 311
 312	spin_lock(&sdp->sd_jindex_spin);
 313	list_add(&list, &sdp->sd_jindex_list);
 314	list_del_init(&sdp->sd_jindex_list);
 315	sdp->sd_journals = 0;
 316	spin_unlock(&sdp->sd_jindex_spin);
 317
 318	while (!list_empty(&list)) {
 319		jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
 320		gfs2_free_journal_extents(jd);
 321		list_del(&jd->jd_list);
 322		iput(jd->jd_inode);
 323		kfree(jd);
 324	}
 325}
 326
 327static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
 328{
 329	struct gfs2_jdesc *jd;
 330	int found = 0;
 331
 332	list_for_each_entry(jd, head, jd_list) {
 333		if (jd->jd_jid == jid) {
 334			found = 1;
 335			break;
 336		}
 337	}
 338
 339	if (!found)
 340		jd = NULL;
 341
 342	return jd;
 343}
 344
 345struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
 346{
 347	struct gfs2_jdesc *jd;
 348
 349	spin_lock(&sdp->sd_jindex_spin);
 350	jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
 351	spin_unlock(&sdp->sd_jindex_spin);
 352
 353	return jd;
 354}
 355
 356int gfs2_jdesc_check(struct gfs2_jdesc *jd)
 357{
 358	struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 359	struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
 360	u64 size = i_size_read(jd->jd_inode);
 361
 362	if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
 363		return -EIO;
 364
 365	jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
 366
 367	if (gfs2_write_alloc_required(ip, 0, size)) {
 368		gfs2_consist_inode(ip);
 369		return -EIO;
 370	}
 371
 372	return 0;
 373}
 374
 375static int init_threads(struct gfs2_sbd *sdp)
 376{
 377	struct task_struct *p;
 378	int error = 0;
 379
 380	p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 381	if (IS_ERR(p)) {
 382		error = PTR_ERR(p);
 383		fs_err(sdp, "can't start logd thread: %d\n", error);
 384		return error;
 385	}
 386	sdp->sd_logd_process = p;
 387
 388	p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 389	if (IS_ERR(p)) {
 390		error = PTR_ERR(p);
 391		fs_err(sdp, "can't start quotad thread: %d\n", error);
 392		goto fail;
 393	}
 394	sdp->sd_quotad_process = p;
 395	return 0;
 396
 397fail:
 398	kthread_stop(sdp->sd_logd_process);
 399	return error;
 400}
 401
 402/**
 403 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
 404 * @sdp: the filesystem
 405 *
 406 * Returns: errno
 407 */
 408
 409int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
 410{
 411	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 412	struct gfs2_glock *j_gl = ip->i_gl;
 413	struct gfs2_holder freeze_gh;
 414	struct gfs2_log_header_host head;
 415	int error;
 416
 417	error = init_threads(sdp);
 418	if (error)
 419		return error;
 420
 421	error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
 422				   &freeze_gh);
 423	if (error)
 424		goto fail_threads;
 425
 426	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
 427
 428	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
 429	if (error)
 430		goto fail;
 431
 432	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 433		gfs2_consist(sdp);
 434		error = -EIO;
 435		goto fail;
 436	}
 437
 438	/*  Initialize some head of the log stuff  */
 439	sdp->sd_log_sequence = head.lh_sequence + 1;
 440	gfs2_log_pointers_init(sdp, head.lh_blkno);
 441
 442	error = gfs2_quota_init(sdp);
 443	if (error)
 444		goto fail;
 445
 446	set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
 447
 448	gfs2_glock_dq_uninit(&freeze_gh);
 449
 450	return 0;
 451
 452fail:
 453	freeze_gh.gh_flags |= GL_NOCACHE;
 454	gfs2_glock_dq_uninit(&freeze_gh);
 455fail_threads:
 456	kthread_stop(sdp->sd_quotad_process);
 457	kthread_stop(sdp->sd_logd_process);
 458	return error;
 459}
 460
 461void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
 462{
 463	const struct gfs2_statfs_change *str = buf;
 464
 465	sc->sc_total = be64_to_cpu(str->sc_total);
 466	sc->sc_free = be64_to_cpu(str->sc_free);
 467	sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
 468}
 469
 470static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
 471{
 472	struct gfs2_statfs_change *str = buf;
 473
 474	str->sc_total = cpu_to_be64(sc->sc_total);
 475	str->sc_free = cpu_to_be64(sc->sc_free);
 476	str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
 477}
 478
 479int gfs2_statfs_init(struct gfs2_sbd *sdp)
 480{
 481	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 482	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 483	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 484	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 485	struct buffer_head *m_bh, *l_bh;
 486	struct gfs2_holder gh;
 487	int error;
 488
 489	error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 490				   &gh);
 491	if (error)
 492		return error;
 493
 494	error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 495	if (error)
 496		goto out;
 497
 498	if (sdp->sd_args.ar_spectator) {
 499		spin_lock(&sdp->sd_statfs_spin);
 500		gfs2_statfs_change_in(m_sc, m_bh->b_data +
 501				      sizeof(struct gfs2_dinode));
 502		spin_unlock(&sdp->sd_statfs_spin);
 503	} else {
 504		error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 505		if (error)
 506			goto out_m_bh;
 507
 508		spin_lock(&sdp->sd_statfs_spin);
 509		gfs2_statfs_change_in(m_sc, m_bh->b_data +
 510				      sizeof(struct gfs2_dinode));
 511		gfs2_statfs_change_in(l_sc, l_bh->b_data +
 512				      sizeof(struct gfs2_dinode));
 513		spin_unlock(&sdp->sd_statfs_spin);
 514
 515		brelse(l_bh);
 516	}
 517
 518out_m_bh:
 519	brelse(m_bh);
 520out:
 521	gfs2_glock_dq_uninit(&gh);
 522	return 0;
 523}
 524
 525void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
 526			s64 dinodes)
 527{
 528	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 529	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 530	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 531	struct buffer_head *l_bh;
 532	s64 x, y;
 533	int need_sync = 0;
 534	int error;
 535
 536	error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 537	if (error)
 538		return;
 539
 540	gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 541
 542	spin_lock(&sdp->sd_statfs_spin);
 543	l_sc->sc_total += total;
 544	l_sc->sc_free += free;
 545	l_sc->sc_dinodes += dinodes;
 546	gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
 547	if (sdp->sd_args.ar_statfs_percent) {
 548		x = 100 * l_sc->sc_free;
 549		y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
 550		if (x >= y || x <= -y)
 551			need_sync = 1;
 552	}
 553	spin_unlock(&sdp->sd_statfs_spin);
 554
 555	brelse(l_bh);
 556	if (need_sync)
 557		gfs2_wake_up_statfs(sdp);
 558}
 559
 560void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
 561		   struct buffer_head *l_bh)
 562{
 563	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 564	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 565	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 566	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 567
 568	gfs2_trans_add_meta(l_ip->i_gl, l_bh);
 569	gfs2_trans_add_meta(m_ip->i_gl, m_bh);
 570
 571	spin_lock(&sdp->sd_statfs_spin);
 572	m_sc->sc_total += l_sc->sc_total;
 573	m_sc->sc_free += l_sc->sc_free;
 574	m_sc->sc_dinodes += l_sc->sc_dinodes;
 575	memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
 576	memset(l_bh->b_data + sizeof(struct gfs2_dinode),
 577	       0, sizeof(struct gfs2_statfs_change));
 578	gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
 579	spin_unlock(&sdp->sd_statfs_spin);
 580}
 581
 582int gfs2_statfs_sync(struct super_block *sb, int type)
 583{
 584	struct gfs2_sbd *sdp = sb->s_fs_info;
 585	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
 586	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
 587	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
 588	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
 589	struct gfs2_holder gh;
 590	struct buffer_head *m_bh, *l_bh;
 591	int error;
 592
 593	sb_start_write(sb);
 594	error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
 595				   &gh);
 596	if (error)
 597		goto out;
 598
 599	error = gfs2_meta_inode_buffer(m_ip, &m_bh);
 600	if (error)
 601		goto out_unlock;
 602
 603	spin_lock(&sdp->sd_statfs_spin);
 604	gfs2_statfs_change_in(m_sc, m_bh->b_data +
 605			      sizeof(struct gfs2_dinode));
 606	if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
 607		spin_unlock(&sdp->sd_statfs_spin);
 608		goto out_bh;
 609	}
 610	spin_unlock(&sdp->sd_statfs_spin);
 611
 612	error = gfs2_meta_inode_buffer(l_ip, &l_bh);
 613	if (error)
 614		goto out_bh;
 615
 616	error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
 617	if (error)
 618		goto out_bh2;
 619
 620	update_statfs(sdp, m_bh, l_bh);
 621	sdp->sd_statfs_force_sync = 0;
 622
 623	gfs2_trans_end(sdp);
 624
 625out_bh2:
 626	brelse(l_bh);
 627out_bh:
 628	brelse(m_bh);
 629out_unlock:
 630	gfs2_glock_dq_uninit(&gh);
 631out:
 632	sb_end_write(sb);
 633	return error;
 634}
 635
 636struct lfcc {
 637	struct list_head list;
 638	struct gfs2_holder gh;
 639};
 640
 641/**
 642 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
 643 *                            journals are clean
 644 * @sdp: the file system
 645 * @state: the state to put the transaction lock into
 646 * @t_gh: the hold on the transaction lock
 647 *
 648 * Returns: errno
 649 */
 650
 651static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
 652				    struct gfs2_holder *freeze_gh)
 653{
 654	struct gfs2_inode *ip;
 655	struct gfs2_jdesc *jd;
 656	struct lfcc *lfcc;
 657	LIST_HEAD(list);
 658	struct gfs2_log_header_host lh;
 659	int error;
 660
 661	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 662		lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
 663		if (!lfcc) {
 664			error = -ENOMEM;
 665			goto out;
 666		}
 667		ip = GFS2_I(jd->jd_inode);
 668		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
 669		if (error) {
 670			kfree(lfcc);
 671			goto out;
 672		}
 673		list_add(&lfcc->list, &list);
 674	}
 675
 676	error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
 677				   GL_NOCACHE, freeze_gh);
 678
 679	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 680		error = gfs2_jdesc_check(jd);
 681		if (error)
 682			break;
 683		error = gfs2_find_jhead(jd, &lh);
 684		if (error)
 685			break;
 686		if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 687			error = -EBUSY;
 688			break;
 689		}
 690	}
 691
 692	if (error)
 693		gfs2_glock_dq_uninit(freeze_gh);
 694
 695out:
 696	while (!list_empty(&list)) {
 697		lfcc = list_entry(list.next, struct lfcc, list);
 698		list_del(&lfcc->list);
 699		gfs2_glock_dq_uninit(&lfcc->gh);
 700		kfree(lfcc);
 701	}
 702	return error;
 703}
 704
 705void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
 706{
 707	struct gfs2_dinode *str = buf;
 708
 709	str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
 710	str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
 711	str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
 712	str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
 713	str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
 714	str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
 715	str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
 716	str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
 717	str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
 718	str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
 719	str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
 720	str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
 721	str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
 722	str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
 723
 724	str->di_goal_meta = cpu_to_be64(ip->i_goal);
 725	str->di_goal_data = cpu_to_be64(ip->i_goal);
 726	str->di_generation = cpu_to_be64(ip->i_generation);
 727
 728	str->di_flags = cpu_to_be32(ip->i_diskflags);
 729	str->di_height = cpu_to_be16(ip->i_height);
 730	str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
 731					     !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
 732					     GFS2_FORMAT_DE : 0);
 733	str->di_depth = cpu_to_be16(ip->i_depth);
 734	str->di_entries = cpu_to_be32(ip->i_entries);
 735
 736	str->di_eattr = cpu_to_be64(ip->i_eattr);
 737	str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
 738	str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
 739	str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
 740}
 741
 742/**
 743 * gfs2_write_inode - Make sure the inode is stable on the disk
 744 * @inode: The inode
 745 * @wbc: The writeback control structure
 746 *
 747 * Returns: errno
 748 */
 749
 750static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
 751{
 752	struct gfs2_inode *ip = GFS2_I(inode);
 753	struct gfs2_sbd *sdp = GFS2_SB(inode);
 754	struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
 755	struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
 756	int ret = 0;
 757	bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
 758
 759	if (flush_all)
 760		gfs2_log_flush(GFS2_SB(inode), ip->i_gl, NORMAL_FLUSH);
 761	if (bdi->wb.dirty_exceeded)
 762		gfs2_ail1_flush(sdp, wbc);
 763	else
 764		filemap_fdatawrite(metamapping);
 765	if (flush_all)
 766		ret = filemap_fdatawait(metamapping);
 767	if (ret)
 768		mark_inode_dirty_sync(inode);
 769	return ret;
 770}
 771
 772/**
 773 * gfs2_dirty_inode - check for atime updates
 774 * @inode: The inode in question
 775 * @flags: The type of dirty
 776 *
 777 * Unfortunately it can be called under any combination of inode
 778 * glock and transaction lock, so we have to check carefully.
 779 *
 780 * At the moment this deals only with atime - it should be possible
 781 * to expand that role in future, once a review of the locking has
 782 * been carried out.
 783 */
 784
 785static void gfs2_dirty_inode(struct inode *inode, int flags)
 786{
 787	struct gfs2_inode *ip = GFS2_I(inode);
 788	struct gfs2_sbd *sdp = GFS2_SB(inode);
 789	struct buffer_head *bh;
 790	struct gfs2_holder gh;
 791	int need_unlock = 0;
 792	int need_endtrans = 0;
 793	int ret;
 794
 795	if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
 796		return;
 797	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 798		return;
 799	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 800		ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 801		if (ret) {
 802			fs_err(sdp, "dirty_inode: glock %d\n", ret);
 803			return;
 804		}
 805		need_unlock = 1;
 806	} else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
 807		return;
 808
 809	if (current->journal_info == NULL) {
 810		ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 811		if (ret) {
 812			fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
 813			goto out;
 814		}
 815		need_endtrans = 1;
 816	}
 817
 818	ret = gfs2_meta_inode_buffer(ip, &bh);
 819	if (ret == 0) {
 820		gfs2_trans_add_meta(ip->i_gl, bh);
 821		gfs2_dinode_out(ip, bh->b_data);
 822		brelse(bh);
 823	}
 824
 825	if (need_endtrans)
 826		gfs2_trans_end(sdp);
 827out:
 828	if (need_unlock)
 829		gfs2_glock_dq_uninit(&gh);
 830}
 831
 832/**
 833 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 834 * @sdp: the filesystem
 835 *
 836 * Returns: errno
 837 */
 838
 839static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 840{
 841	struct gfs2_holder freeze_gh;
 842	int error;
 843
 844	error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
 845				   &freeze_gh);
 846	if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 847		return error;
 848
 849	kthread_stop(sdp->sd_quotad_process);
 850	kthread_stop(sdp->sd_logd_process);
 851
 852	flush_workqueue(gfs2_delete_workqueue);
 853	gfs2_quota_sync(sdp->sd_vfs, 0);
 854	gfs2_statfs_sync(sdp->sd_vfs, 0);
 855
 856	gfs2_log_flush(sdp, NULL, SHUTDOWN_FLUSH);
 857	wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
 858	gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
 859
 860	if (gfs2_holder_initialized(&freeze_gh))
 861		gfs2_glock_dq_uninit(&freeze_gh);
 862
 863	gfs2_quota_cleanup(sdp);
 864
 865	return error;
 866}
 867
 868/**
 869 * gfs2_put_super - Unmount the filesystem
 870 * @sb: The VFS superblock
 871 *
 872 */
 873
 874static void gfs2_put_super(struct super_block *sb)
 875{
 876	struct gfs2_sbd *sdp = sb->s_fs_info;
 877	int error;
 878	struct gfs2_jdesc *jd;
 879
 880	/* No more recovery requests */
 881	set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 882	smp_mb();
 883
 884	/* Wait on outstanding recovery */
 885restart:
 886	spin_lock(&sdp->sd_jindex_spin);
 887	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 888		if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 889			continue;
 890		spin_unlock(&sdp->sd_jindex_spin);
 891		wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 892			    TASK_UNINTERRUPTIBLE);
 893		goto restart;
 894	}
 895	spin_unlock(&sdp->sd_jindex_spin);
 896
 897	if (!sb_rdonly(sb)) {
 898		error = gfs2_make_fs_ro(sdp);
 899		if (error)
 900			gfs2_io_error(sdp);
 901	}
 902	/*  At this point, we're through modifying the disk  */
 903
 904	/*  Release stuff  */
 905
 906	iput(sdp->sd_jindex);
 907	iput(sdp->sd_statfs_inode);
 908	iput(sdp->sd_rindex);
 909	iput(sdp->sd_quota_inode);
 910
 911	gfs2_glock_put(sdp->sd_rename_gl);
 912	gfs2_glock_put(sdp->sd_freeze_gl);
 913
 914	if (!sdp->sd_args.ar_spectator) {
 915		gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 916		gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 917		gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 918		gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 919		iput(sdp->sd_sc_inode);
 920		iput(sdp->sd_qc_inode);
 921	}
 922
 923	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 924	gfs2_clear_rgrpd(sdp);
 925	gfs2_jindex_free(sdp);
 926	/*  Take apart glock structures and buffer lists  */
 927	gfs2_gl_hash_clear(sdp);
 928	gfs2_delete_debugfs_file(sdp);
 929	/*  Unmount the locking protocol  */
 930	gfs2_lm_unmount(sdp);
 931
 932	/*  At this point, we're through participating in the lockspace  */
 933	gfs2_sys_fs_del(sdp);
 934}
 935
 936/**
 937 * gfs2_sync_fs - sync the filesystem
 938 * @sb: the superblock
 939 *
 940 * Flushes the log to disk.
 941 */
 942
 943static int gfs2_sync_fs(struct super_block *sb, int wait)
 944{
 945	struct gfs2_sbd *sdp = sb->s_fs_info;
 946
 947	gfs2_quota_sync(sb, -1);
 948	if (wait)
 949		gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
 950	return sdp->sd_log_error;
 951}
 952
 953void gfs2_freeze_func(struct work_struct *work)
 954{
 955	int error;
 956	struct gfs2_holder freeze_gh;
 957	struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
 958	struct super_block *sb = sdp->sd_vfs;
 959
 960	atomic_inc(&sb->s_active);
 961	error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
 962				   &freeze_gh);
 963	if (error) {
 964		printk(KERN_INFO "GFS2: couln't get freeze lock : %d\n", error);
 965		gfs2_assert_withdraw(sdp, 0);
 966	}
 967	else {
 968		atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 969		error = thaw_super(sb);
 970		if (error) {
 971			printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n",
 972			       error);
 973			gfs2_assert_withdraw(sdp, 0);
 974		}
 975		if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
 976			freeze_gh.gh_flags |= GL_NOCACHE;
 977		gfs2_glock_dq_uninit(&freeze_gh);
 978	}
 979	deactivate_super(sb);
 980	return;
 981}
 982
 983/**
 984 * gfs2_freeze - prevent further writes to the filesystem
 985 * @sb: the VFS structure for the filesystem
 986 *
 987 */
 988
 989static int gfs2_freeze(struct super_block *sb)
 990{
 991	struct gfs2_sbd *sdp = sb->s_fs_info;
 992	int error = 0;
 993
 994	mutex_lock(&sdp->sd_freeze_mutex);
 995	if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
 996		goto out;
 997
 998	if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 999		error = -EINVAL;
1000		goto out;
1001	}
1002
1003	for (;;) {
1004		error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
1005		if (!error)
1006			break;
1007
1008		switch (error) {
1009		case -EBUSY:
1010			fs_err(sdp, "waiting for recovery before freeze\n");
1011			break;
1012
1013		default:
1014			fs_err(sdp, "error freezing FS: %d\n", error);
1015			break;
1016		}
1017
1018		fs_err(sdp, "retrying...\n");
1019		msleep(1000);
1020	}
1021	error = 0;
1022out:
1023	mutex_unlock(&sdp->sd_freeze_mutex);
1024	return error;
1025}
1026
1027/**
1028 * gfs2_unfreeze - reallow writes to the filesystem
1029 * @sb: the VFS structure for the filesystem
1030 *
1031 */
1032
1033static int gfs2_unfreeze(struct super_block *sb)
1034{
1035	struct gfs2_sbd *sdp = sb->s_fs_info;
1036
1037	mutex_lock(&sdp->sd_freeze_mutex);
1038        if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
1039	    !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
1040		mutex_unlock(&sdp->sd_freeze_mutex);
1041                return 0;
1042	}
1043
1044	gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1045	mutex_unlock(&sdp->sd_freeze_mutex);
1046	return 0;
1047}
1048
1049/**
1050 * statfs_fill - fill in the sg for a given RG
1051 * @rgd: the RG
1052 * @sc: the sc structure
1053 *
1054 * Returns: 0 on success, -ESTALE if the LVB is invalid
1055 */
1056
1057static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1058			    struct gfs2_statfs_change_host *sc)
1059{
1060	gfs2_rgrp_verify(rgd);
1061	sc->sc_total += rgd->rd_data;
1062	sc->sc_free += rgd->rd_free;
1063	sc->sc_dinodes += rgd->rd_dinodes;
1064	return 0;
1065}
1066
1067/**
1068 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1069 * @sdp: the filesystem
1070 * @sc: the sc info that will be returned
1071 *
1072 * Any error (other than a signal) will cause this routine to fall back
1073 * to the synchronous version.
1074 *
1075 * FIXME: This really shouldn't busy wait like this.
1076 *
1077 * Returns: errno
1078 */
1079
1080static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1081{
1082	struct gfs2_rgrpd *rgd_next;
1083	struct gfs2_holder *gha, *gh;
1084	unsigned int slots = 64;
1085	unsigned int x;
1086	int done;
1087	int error = 0, err;
1088
1089	memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1090	gha = kmalloc(slots * sizeof(struct gfs2_holder), GFP_KERNEL);
1091	if (!gha)
1092		return -ENOMEM;
1093	for (x = 0; x < slots; x++)
1094		gfs2_holder_mark_uninitialized(gha + x);
1095
1096	rgd_next = gfs2_rgrpd_get_first(sdp);
1097
1098	for (;;) {
1099		done = 1;
1100
1101		for (x = 0; x < slots; x++) {
1102			gh = gha + x;
1103
1104			if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
1105				err = gfs2_glock_wait(gh);
1106				if (err) {
1107					gfs2_holder_uninit(gh);
1108					error = err;
1109				} else {
1110					if (!error) {
1111						struct gfs2_rgrpd *rgd =
1112							gfs2_glock2rgrp(gh->gh_gl);
1113
1114						error = statfs_slow_fill(rgd, sc);
1115					}
1116					gfs2_glock_dq_uninit(gh);
1117				}
1118			}
1119
1120			if (gfs2_holder_initialized(gh))
1121				done = 0;
1122			else if (rgd_next && !error) {
1123				error = gfs2_glock_nq_init(rgd_next->rd_gl,
1124							   LM_ST_SHARED,
1125							   GL_ASYNC,
1126							   gh);
1127				rgd_next = gfs2_rgrpd_get_next(rgd_next);
1128				done = 0;
1129			}
1130
1131			if (signal_pending(current))
1132				error = -ERESTARTSYS;
1133		}
1134
1135		if (done)
1136			break;
1137
1138		yield();
1139	}
1140
1141	kfree(gha);
1142	return error;
1143}
1144
1145/**
1146 * gfs2_statfs_i - Do a statfs
1147 * @sdp: the filesystem
1148 * @sg: the sg structure
1149 *
1150 * Returns: errno
1151 */
1152
1153static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1154{
1155	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1156	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1157
1158	spin_lock(&sdp->sd_statfs_spin);
1159
1160	*sc = *m_sc;
1161	sc->sc_total += l_sc->sc_total;
1162	sc->sc_free += l_sc->sc_free;
1163	sc->sc_dinodes += l_sc->sc_dinodes;
1164
1165	spin_unlock(&sdp->sd_statfs_spin);
1166
1167	if (sc->sc_free < 0)
1168		sc->sc_free = 0;
1169	if (sc->sc_free > sc->sc_total)
1170		sc->sc_free = sc->sc_total;
1171	if (sc->sc_dinodes < 0)
1172		sc->sc_dinodes = 0;
1173
1174	return 0;
1175}
1176
1177/**
1178 * gfs2_statfs - Gather and return stats about the filesystem
1179 * @sb: The superblock
1180 * @statfsbuf: The buffer
1181 *
1182 * Returns: 0 on success or error code
1183 */
1184
1185static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1186{
1187	struct super_block *sb = dentry->d_sb;
1188	struct gfs2_sbd *sdp = sb->s_fs_info;
1189	struct gfs2_statfs_change_host sc;
1190	int error;
1191
1192	error = gfs2_rindex_update(sdp);
1193	if (error)
1194		return error;
1195
1196	if (gfs2_tune_get(sdp, gt_statfs_slow))
1197		error = gfs2_statfs_slow(sdp, &sc);
1198	else
1199		error = gfs2_statfs_i(sdp, &sc);
1200
1201	if (error)
1202		return error;
1203
1204	buf->f_type = GFS2_MAGIC;
1205	buf->f_bsize = sdp->sd_sb.sb_bsize;
1206	buf->f_blocks = sc.sc_total;
1207	buf->f_bfree = sc.sc_free;
1208	buf->f_bavail = sc.sc_free;
1209	buf->f_files = sc.sc_dinodes + sc.sc_free;
1210	buf->f_ffree = sc.sc_free;
1211	buf->f_namelen = GFS2_FNAMESIZE;
1212
1213	return 0;
1214}
1215
1216/**
1217 * gfs2_remount_fs - called when the FS is remounted
1218 * @sb:  the filesystem
1219 * @flags:  the remount flags
1220 * @data:  extra data passed in (not used right now)
1221 *
1222 * Returns: errno
1223 */
1224
1225static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1226{
1227	struct gfs2_sbd *sdp = sb->s_fs_info;
1228	struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1229	struct gfs2_tune *gt = &sdp->sd_tune;
1230	int error;
1231
1232	sync_filesystem(sb);
1233
1234	spin_lock(&gt->gt_spin);
1235	args.ar_commit = gt->gt_logd_secs;
1236	args.ar_quota_quantum = gt->gt_quota_quantum;
1237	if (gt->gt_statfs_slow)
1238		args.ar_statfs_quantum = 0;
1239	else
1240		args.ar_statfs_quantum = gt->gt_statfs_quantum;
1241	spin_unlock(&gt->gt_spin);
1242	error = gfs2_mount_args(&args, data);
1243	if (error)
1244		return error;
1245
1246	/* Not allowed to change locking details */
1247	if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1248	    strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1249	    strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1250		return -EINVAL;
1251
1252	/* Some flags must not be changed */
1253	if (args_neq(&args, &sdp->sd_args, spectator) ||
1254	    args_neq(&args, &sdp->sd_args, localflocks) ||
1255	    args_neq(&args, &sdp->sd_args, meta))
1256		return -EINVAL;
1257
1258	if (sdp->sd_args.ar_spectator)
1259		*flags |= MS_RDONLY;
1260
1261	if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1262		if (*flags & MS_RDONLY)
1263			error = gfs2_make_fs_ro(sdp);
1264		else
1265			error = gfs2_make_fs_rw(sdp);
1266		if (error)
1267			return error;
1268	}
1269
1270	sdp->sd_args = args;
1271	if (sdp->sd_args.ar_posix_acl)
1272		sb->s_flags |= MS_POSIXACL;
1273	else
1274		sb->s_flags &= ~MS_POSIXACL;
1275	if (sdp->sd_args.ar_nobarrier)
1276		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1277	else
1278		clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1279	spin_lock(&gt->gt_spin);
1280	gt->gt_logd_secs = args.ar_commit;
1281	gt->gt_quota_quantum = args.ar_quota_quantum;
1282	if (args.ar_statfs_quantum) {
1283		gt->gt_statfs_slow = 0;
1284		gt->gt_statfs_quantum = args.ar_statfs_quantum;
1285	}
1286	else {
1287		gt->gt_statfs_slow = 1;
1288		gt->gt_statfs_quantum = 30;
1289	}
1290	spin_unlock(&gt->gt_spin);
1291
1292	gfs2_online_uevent(sdp);
1293	return 0;
1294}
1295
1296/**
1297 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1298 * @inode: The inode to drop
1299 *
1300 * If we've received a callback on an iopen lock then it's because a
1301 * remote node tried to deallocate the inode but failed due to this node
1302 * still having the inode open. Here we mark the link count zero
1303 * since we know that it must have reached zero if the GLF_DEMOTE flag
1304 * is set on the iopen glock. If we didn't do a disk read since the
1305 * remote node removed the final link then we might otherwise miss
1306 * this event. This check ensures that this node will deallocate the
1307 * inode's blocks, or alternatively pass the baton on to another
1308 * node for later deallocation.
1309 */
1310
1311static int gfs2_drop_inode(struct inode *inode)
1312{
1313	struct gfs2_inode *ip = GFS2_I(inode);
1314
1315	if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1316	    inode->i_nlink &&
1317	    gfs2_holder_initialized(&ip->i_iopen_gh)) {
1318		struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1319		if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1320			clear_nlink(inode);
1321	}
1322
1323	/*
1324	 * When under memory pressure when an inode's link count has dropped to
1325	 * zero, defer deleting the inode to the delete workqueue.  This avoids
1326	 * calling into DLM under memory pressure, which can deadlock.
1327	 */
1328	if (!inode->i_nlink &&
1329	    unlikely(current->flags & PF_MEMALLOC) &&
1330	    gfs2_holder_initialized(&ip->i_iopen_gh)) {
1331		struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1332
1333		gfs2_glock_hold(gl);
1334		if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
1335			gfs2_glock_queue_put(gl);
1336		return false;
1337	}
1338
1339	return generic_drop_inode(inode);
1340}
1341
1342static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1343{
1344	do {
1345		if (d1 == d2)
1346			return 1;
1347		d1 = d1->d_parent;
1348	} while (!IS_ROOT(d1));
1349	return 0;
1350}
1351
1352/**
1353 * gfs2_show_options - Show mount options for /proc/mounts
1354 * @s: seq_file structure
1355 * @root: root of this (sub)tree
1356 *
1357 * Returns: 0 on success or error code
1358 */
1359
1360static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1361{
1362	struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1363	struct gfs2_args *args = &sdp->sd_args;
1364	int val;
1365
1366	if (is_ancestor(root, sdp->sd_master_dir))
1367		seq_puts(s, ",meta");
1368	if (args->ar_lockproto[0])
1369		seq_show_option(s, "lockproto", args->ar_lockproto);
1370	if (args->ar_locktable[0])
1371		seq_show_option(s, "locktable", args->ar_locktable);
1372	if (args->ar_hostdata[0])
1373		seq_show_option(s, "hostdata", args->ar_hostdata);
1374	if (args->ar_spectator)
1375		seq_puts(s, ",spectator");
1376	if (args->ar_localflocks)
1377		seq_puts(s, ",localflocks");
1378	if (args->ar_debug)
1379		seq_puts(s, ",debug");
1380	if (args->ar_posix_acl)
1381		seq_puts(s, ",acl");
1382	if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1383		char *state;
1384		switch (args->ar_quota) {
1385		case GFS2_QUOTA_OFF:
1386			state = "off";
1387			break;
1388		case GFS2_QUOTA_ACCOUNT:
1389			state = "account";
1390			break;
1391		case GFS2_QUOTA_ON:
1392			state = "on";
1393			break;
1394		default:
1395			state = "unknown";
1396			break;
1397		}
1398		seq_printf(s, ",quota=%s", state);
1399	}
1400	if (args->ar_suiddir)
1401		seq_puts(s, ",suiddir");
1402	if (args->ar_data != GFS2_DATA_DEFAULT) {
1403		char *state;
1404		switch (args->ar_data) {
1405		case GFS2_DATA_WRITEBACK:
1406			state = "writeback";
1407			break;
1408		case GFS2_DATA_ORDERED:
1409			state = "ordered";
1410			break;
1411		default:
1412			state = "unknown";
1413			break;
1414		}
1415		seq_printf(s, ",data=%s", state);
1416	}
1417	if (args->ar_discard)
1418		seq_puts(s, ",discard");
1419	val = sdp->sd_tune.gt_logd_secs;
1420	if (val != 30)
1421		seq_printf(s, ",commit=%d", val);
1422	val = sdp->sd_tune.gt_statfs_quantum;
1423	if (val != 30)
1424		seq_printf(s, ",statfs_quantum=%d", val);
1425	else if (sdp->sd_tune.gt_statfs_slow)
1426		seq_puts(s, ",statfs_quantum=0");
1427	val = sdp->sd_tune.gt_quota_quantum;
1428	if (val != 60)
1429		seq_printf(s, ",quota_quantum=%d", val);
1430	if (args->ar_statfs_percent)
1431		seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1432	if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1433		const char *state;
1434
1435		switch (args->ar_errors) {
1436		case GFS2_ERRORS_WITHDRAW:
1437			state = "withdraw";
1438			break;
1439		case GFS2_ERRORS_PANIC:
1440			state = "panic";
1441			break;
1442		default:
1443			state = "unknown";
1444			break;
1445		}
1446		seq_printf(s, ",errors=%s", state);
1447	}
1448	if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1449		seq_puts(s, ",nobarrier");
1450	if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1451		seq_puts(s, ",demote_interface_used");
1452	if (args->ar_rgrplvb)
1453		seq_puts(s, ",rgrplvb");
1454	if (args->ar_loccookie)
1455		seq_puts(s, ",loccookie");
1456	return 0;
1457}
1458
1459static void gfs2_final_release_pages(struct gfs2_inode *ip)
1460{
1461	struct inode *inode = &ip->i_inode;
1462	struct gfs2_glock *gl = ip->i_gl;
1463
1464	truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1465	truncate_inode_pages(&inode->i_data, 0);
1466
1467	if (atomic_read(&gl->gl_revokes) == 0) {
1468		clear_bit(GLF_LFLUSH, &gl->gl_flags);
1469		clear_bit(GLF_DIRTY, &gl->gl_flags);
1470	}
1471}
1472
1473static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1474{
1475	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1476	struct gfs2_rgrpd *rgd;
1477	struct gfs2_holder gh;
1478	int error;
1479
1480	if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1481		gfs2_consist_inode(ip);
1482		return -EIO;
1483	}
1484
1485	error = gfs2_rindex_update(sdp);
1486	if (error)
1487		return error;
1488
1489	error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1490	if (error)
1491		return error;
1492
1493	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1494	if (!rgd) {
1495		gfs2_consist_inode(ip);
1496		error = -EIO;
1497		goto out_qs;
1498	}
1499
1500	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1501	if (error)
1502		goto out_qs;
1503
1504	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1505				 sdp->sd_jdesc->jd_blocks);
1506	if (error)
1507		goto out_rg_gunlock;
1508
1509	gfs2_free_di(rgd, ip);
1510
1511	gfs2_final_release_pages(ip);
1512
1513	gfs2_trans_end(sdp);
1514
1515out_rg_gunlock:
1516	gfs2_glock_dq_uninit(&gh);
1517out_qs:
1518	gfs2_quota_unhold(ip);
1519	return error;
1520}
1521
1522/**
1523 * gfs2_glock_put_eventually
1524 * @gl:	The glock to put
1525 *
1526 * When under memory pressure, trigger a deferred glock put to make sure we
1527 * won't call into DLM and deadlock.  Otherwise, put the glock directly.
1528 */
1529
1530static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1531{
1532	if (current->flags & PF_MEMALLOC)
1533		gfs2_glock_queue_put(gl);
1534	else
1535		gfs2_glock_put(gl);
1536}
1537
1538/**
1539 * gfs2_evict_inode - Remove an inode from cache
1540 * @inode: The inode to evict
1541 *
1542 * There are three cases to consider:
1543 * 1. i_nlink == 0, we are final opener (and must deallocate)
1544 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1545 * 3. i_nlink > 0
1546 *
1547 * If the fs is read only, then we have to treat all cases as per #3
1548 * since we are unable to do any deallocation. The inode will be
1549 * deallocated by the next read/write node to attempt an allocation
1550 * in the same resource group
1551 *
1552 * We have to (at the moment) hold the inodes main lock to cover
1553 * the gap between unlocking the shared lock on the iopen lock and
1554 * taking the exclusive lock. I'd rather do a shared -> exclusive
1555 * conversion on the iopen lock, but we can change that later. This
1556 * is safe, just less efficient.
1557 */
1558
1559static void gfs2_evict_inode(struct inode *inode)
1560{
1561	struct super_block *sb = inode->i_sb;
1562	struct gfs2_sbd *sdp = sb->s_fs_info;
1563	struct gfs2_inode *ip = GFS2_I(inode);
1564	struct gfs2_holder gh;
1565	struct address_space *metamapping;
1566	int error;
1567
1568	if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1569		clear_inode(inode);
1570		return;
1571	}
1572
1573	if (inode->i_nlink || sb_rdonly(sb))
1574		goto out;
1575
1576	if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1577		BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1578		gfs2_holder_mark_uninitialized(&gh);
1579		goto alloc_failed;
1580	}
1581
1582	/* Deletes should never happen under memory pressure anymore.  */
1583	if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1584		goto out;
1585
1586	/* Must not read inode block until block type has been verified */
1587	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1588	if (unlikely(error)) {
1589		glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1590		ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1591		gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1592		goto out;
1593	}
1594
1595	error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1596	if (error)
1597		goto out_truncate;
1598
1599	if (test_bit(GIF_INVALID, &ip->i_flags)) {
1600		error = gfs2_inode_refresh(ip);
1601		if (error)
1602			goto out_truncate;
1603	}
1604
1605	/*
1606	 * The inode may have been recreated in the meantime.
1607	 */
1608	if (inode->i_nlink)
1609		goto out_truncate;
1610
1611alloc_failed:
1612	if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1613	    test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1614		ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1615		gfs2_glock_dq_wait(&ip->i_iopen_gh);
1616		gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1617				   &ip->i_iopen_gh);
1618		error = gfs2_glock_nq(&ip->i_iopen_gh);
1619		if (error)
1620			goto out_truncate;
1621	}
1622
1623	/* Case 1 starts here */
1624
1625	if (S_ISDIR(inode->i_mode) &&
1626	    (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1627		error = gfs2_dir_exhash_dealloc(ip);
1628		if (error)
1629			goto out_unlock;
1630	}
1631
1632	if (ip->i_eattr) {
1633		error = gfs2_ea_dealloc(ip);
1634		if (error)
1635			goto out_unlock;
1636	}
1637
1638	if (!gfs2_is_stuffed(ip)) {
1639		error = gfs2_file_dealloc(ip);
1640		if (error)
1641			goto out_unlock;
1642	}
1643
1644	/* We're about to clear the bitmap for the dinode, but as soon as we
1645	   do, gfs2_create_inode can create another inode at the same block
1646	   location and try to set gl_object again. We clear gl_object here so
1647	   that subsequent inode creates don't see an old gl_object. */
1648	glock_clear_object(ip->i_gl, ip);
1649	error = gfs2_dinode_dealloc(ip);
1650	goto out_unlock;
1651
1652out_truncate:
1653	gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
1654	metamapping = gfs2_glock2aspace(ip->i_gl);
1655	if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1656		filemap_fdatawrite(metamapping);
1657		filemap_fdatawait(metamapping);
1658	}
1659	write_inode_now(inode, 1);
1660	gfs2_ail_flush(ip->i_gl, 0);
1661
1662	/* Case 2 starts here */
1663	error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1664	if (error)
1665		goto out_unlock;
1666	/* Needs to be done before glock release & also in a transaction */
1667	truncate_inode_pages(&inode->i_data, 0);
1668	truncate_inode_pages(metamapping, 0);
1669	gfs2_trans_end(sdp);
1670
1671out_unlock:
1672	/* Error path for case 1 */
1673	if (gfs2_rs_active(&ip->i_res))
1674		gfs2_rs_deltree(&ip->i_res);
1675
1676	if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1677		glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1678		if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1679			ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1680			gfs2_glock_dq(&ip->i_iopen_gh);
1681		}
1682		gfs2_holder_uninit(&ip->i_iopen_gh);
1683	}
1684	if (gfs2_holder_initialized(&gh)) {
1685		glock_clear_object(ip->i_gl, ip);
1686		gfs2_glock_dq_uninit(&gh);
1687	}
1688	if (error && error != GLR_TRYFAILED && error != -EROFS)
1689		fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1690out:
1691	/* Case 3 starts here */
1692	truncate_inode_pages_final(&inode->i_data);
1693	gfs2_rsqa_delete(ip, NULL);
1694	gfs2_ordered_del_inode(ip);
1695	clear_inode(inode);
1696	gfs2_dir_hash_inval(ip);
1697	glock_clear_object(ip->i_gl, ip);
1698	wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1699	gfs2_glock_add_to_lru(ip->i_gl);
1700	gfs2_glock_put_eventually(ip->i_gl);
1701	ip->i_gl = NULL;
1702	if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1703		struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1704
1705		glock_clear_object(gl, ip);
1706		ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1707		gfs2_glock_hold(gl);
1708		gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1709		gfs2_glock_put_eventually(gl);
1710	}
1711}
1712
1713static struct inode *gfs2_alloc_inode(struct super_block *sb)
1714{
1715	struct gfs2_inode *ip;
1716
1717	ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1718	if (ip) {
1719		ip->i_flags = 0;
1720		ip->i_gl = NULL;
1721		ip->i_rgd = NULL;
1722		memset(&ip->i_res, 0, sizeof(ip->i_res));
1723		RB_CLEAR_NODE(&ip->i_res.rs_node);
1724		ip->i_rahead = 0;
1725	}
1726	return &ip->i_inode;
1727}
1728
1729static void gfs2_i_callback(struct rcu_head *head)
1730{
1731	struct inode *inode = container_of(head, struct inode, i_rcu);
1732	kmem_cache_free(gfs2_inode_cachep, inode);
1733}
1734
1735static void gfs2_destroy_inode(struct inode *inode)
1736{
1737	call_rcu(&inode->i_rcu, gfs2_i_callback);
1738}
1739
1740const struct super_operations gfs2_super_ops = {
1741	.alloc_inode		= gfs2_alloc_inode,
1742	.destroy_inode		= gfs2_destroy_inode,
1743	.write_inode		= gfs2_write_inode,
1744	.dirty_inode		= gfs2_dirty_inode,
1745	.evict_inode		= gfs2_evict_inode,
1746	.put_super		= gfs2_put_super,
1747	.sync_fs		= gfs2_sync_fs,
1748	.freeze_super		= gfs2_freeze,
1749	.thaw_super		= gfs2_unfreeze,
1750	.statfs			= gfs2_statfs,
1751	.remount_fs		= gfs2_remount_fs,
1752	.drop_inode		= gfs2_drop_inode,
1753	.show_options		= gfs2_show_options,
1754};
1755