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/fs/gfs2/super.c

https://bitbucket.org/emiliolopez/linux
C | 1697 lines | 1296 code | 217 blank | 184 comment | 206 complexity | 22184ab12c71473fc7f4539d3667bba5 MD5 | raw file
   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
 758	if (wbc->sync_mode == WB_SYNC_ALL)
 759		gfs2_log_flush(GFS2_SB(inode), ip->i_gl, NORMAL_FLUSH);
 760	if (bdi->wb.dirty_exceeded)
 761		gfs2_ail1_flush(sdp, wbc);
 762	else
 763		filemap_fdatawrite(metamapping);
 764	if (wbc->sync_mode == WB_SYNC_ALL)
 765		ret = filemap_fdatawait(metamapping);
 766	if (ret)
 767		mark_inode_dirty_sync(inode);
 768	return ret;
 769}
 770
 771/**
 772 * gfs2_dirty_inode - check for atime updates
 773 * @inode: The inode in question
 774 * @flags: The type of dirty
 775 *
 776 * Unfortunately it can be called under any combination of inode
 777 * glock and transaction lock, so we have to check carefully.
 778 *
 779 * At the moment this deals only with atime - it should be possible
 780 * to expand that role in future, once a review of the locking has
 781 * been carried out.
 782 */
 783
 784static void gfs2_dirty_inode(struct inode *inode, int flags)
 785{
 786	struct gfs2_inode *ip = GFS2_I(inode);
 787	struct gfs2_sbd *sdp = GFS2_SB(inode);
 788	struct buffer_head *bh;
 789	struct gfs2_holder gh;
 790	int need_unlock = 0;
 791	int need_endtrans = 0;
 792	int ret;
 793
 794	if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
 795		return;
 796	if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 797		return;
 798	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 799		ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
 800		if (ret) {
 801			fs_err(sdp, "dirty_inode: glock %d\n", ret);
 802			return;
 803		}
 804		need_unlock = 1;
 805	} else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
 806		return;
 807
 808	if (current->journal_info == NULL) {
 809		ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
 810		if (ret) {
 811			fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
 812			goto out;
 813		}
 814		need_endtrans = 1;
 815	}
 816
 817	ret = gfs2_meta_inode_buffer(ip, &bh);
 818	if (ret == 0) {
 819		gfs2_trans_add_meta(ip->i_gl, bh);
 820		gfs2_dinode_out(ip, bh->b_data);
 821		brelse(bh);
 822	}
 823
 824	if (need_endtrans)
 825		gfs2_trans_end(sdp);
 826out:
 827	if (need_unlock)
 828		gfs2_glock_dq_uninit(&gh);
 829}
 830
 831/**
 832 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
 833 * @sdp: the filesystem
 834 *
 835 * Returns: errno
 836 */
 837
 838static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
 839{
 840	struct gfs2_holder freeze_gh;
 841	int error;
 842
 843	error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
 844				   &freeze_gh);
 845	if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
 846		return error;
 847
 848	kthread_stop(sdp->sd_quotad_process);
 849	kthread_stop(sdp->sd_logd_process);
 850
 851	flush_workqueue(gfs2_delete_workqueue);
 852	gfs2_quota_sync(sdp->sd_vfs, 0);
 853	gfs2_statfs_sync(sdp->sd_vfs, 0);
 854
 855	gfs2_log_flush(sdp, NULL, SHUTDOWN_FLUSH);
 856	wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
 857	gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
 858
 859	if (gfs2_holder_initialized(&freeze_gh))
 860		gfs2_glock_dq_uninit(&freeze_gh);
 861
 862	gfs2_quota_cleanup(sdp);
 863
 864	return error;
 865}
 866
 867/**
 868 * gfs2_put_super - Unmount the filesystem
 869 * @sb: The VFS superblock
 870 *
 871 */
 872
 873static void gfs2_put_super(struct super_block *sb)
 874{
 875	struct gfs2_sbd *sdp = sb->s_fs_info;
 876	int error;
 877	struct gfs2_jdesc *jd;
 878
 879	/* No more recovery requests */
 880	set_bit(SDF_NORECOVERY, &sdp->sd_flags);
 881	smp_mb();
 882
 883	/* Wait on outstanding recovery */
 884restart:
 885	spin_lock(&sdp->sd_jindex_spin);
 886	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
 887		if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
 888			continue;
 889		spin_unlock(&sdp->sd_jindex_spin);
 890		wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
 891			    TASK_UNINTERRUPTIBLE);
 892		goto restart;
 893	}
 894	spin_unlock(&sdp->sd_jindex_spin);
 895
 896	if (!(sb->s_flags & MS_RDONLY)) {
 897		error = gfs2_make_fs_ro(sdp);
 898		if (error)
 899			gfs2_io_error(sdp);
 900	}
 901	/*  At this point, we're through modifying the disk  */
 902
 903	/*  Release stuff  */
 904
 905	iput(sdp->sd_jindex);
 906	iput(sdp->sd_statfs_inode);
 907	iput(sdp->sd_rindex);
 908	iput(sdp->sd_quota_inode);
 909
 910	gfs2_glock_put(sdp->sd_rename_gl);
 911	gfs2_glock_put(sdp->sd_freeze_gl);
 912
 913	if (!sdp->sd_args.ar_spectator) {
 914		gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 915		gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 916		gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 917		gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 918		iput(sdp->sd_sc_inode);
 919		iput(sdp->sd_qc_inode);
 920	}
 921
 922	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 923	gfs2_clear_rgrpd(sdp);
 924	gfs2_jindex_free(sdp);
 925	/*  Take apart glock structures and buffer lists  */
 926	gfs2_gl_hash_clear(sdp);
 927	/*  Unmount the locking protocol  */
 928	gfs2_lm_unmount(sdp);
 929
 930	/*  At this point, we're through participating in the lockspace  */
 931	gfs2_sys_fs_del(sdp);
 932}
 933
 934/**
 935 * gfs2_sync_fs - sync the filesystem
 936 * @sb: the superblock
 937 *
 938 * Flushes the log to disk.
 939 */
 940
 941static int gfs2_sync_fs(struct super_block *sb, int wait)
 942{
 943	struct gfs2_sbd *sdp = sb->s_fs_info;
 944
 945	gfs2_quota_sync(sb, -1);
 946	if (wait && sdp)
 947		gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
 948	return 0;
 949}
 950
 951void gfs2_freeze_func(struct work_struct *work)
 952{
 953	int error;
 954	struct gfs2_holder freeze_gh;
 955	struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
 956	struct super_block *sb = sdp->sd_vfs;
 957
 958	atomic_inc(&sb->s_active);
 959	error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
 960				   &freeze_gh);
 961	if (error) {
 962		printk(KERN_INFO "GFS2: couln't get freeze lock : %d\n", error);
 963		gfs2_assert_withdraw(sdp, 0);
 964	}
 965	else {
 966		atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
 967		error = thaw_super(sb);
 968		if (error) {
 969			printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n",
 970			       error);
 971			gfs2_assert_withdraw(sdp, 0);
 972		}
 973		if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
 974			freeze_gh.gh_flags |= GL_NOCACHE;
 975		gfs2_glock_dq_uninit(&freeze_gh);
 976	}
 977	deactivate_super(sb);
 978	return;
 979}
 980
 981/**
 982 * gfs2_freeze - prevent further writes to the filesystem
 983 * @sb: the VFS structure for the filesystem
 984 *
 985 */
 986
 987static int gfs2_freeze(struct super_block *sb)
 988{
 989	struct gfs2_sbd *sdp = sb->s_fs_info;
 990	int error = 0;
 991
 992	mutex_lock(&sdp->sd_freeze_mutex);
 993	if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
 994		goto out;
 995
 996	if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
 997		error = -EINVAL;
 998		goto out;
 999	}
1000
1001	for (;;) {
1002		error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
1003		if (!error)
1004			break;
1005
1006		switch (error) {
1007		case -EBUSY:
1008			fs_err(sdp, "waiting for recovery before freeze\n");
1009			break;
1010
1011		default:
1012			fs_err(sdp, "error freezing FS: %d\n", error);
1013			break;
1014		}
1015
1016		fs_err(sdp, "retrying...\n");
1017		msleep(1000);
1018	}
1019	error = 0;
1020out:
1021	mutex_unlock(&sdp->sd_freeze_mutex);
1022	return error;
1023}
1024
1025/**
1026 * gfs2_unfreeze - reallow writes to the filesystem
1027 * @sb: the VFS structure for the filesystem
1028 *
1029 */
1030
1031static int gfs2_unfreeze(struct super_block *sb)
1032{
1033	struct gfs2_sbd *sdp = sb->s_fs_info;
1034
1035	mutex_lock(&sdp->sd_freeze_mutex);
1036        if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
1037	    !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
1038		mutex_unlock(&sdp->sd_freeze_mutex);
1039                return 0;
1040	}
1041
1042	gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1043	mutex_unlock(&sdp->sd_freeze_mutex);
1044	return 0;
1045}
1046
1047/**
1048 * statfs_fill - fill in the sg for a given RG
1049 * @rgd: the RG
1050 * @sc: the sc structure
1051 *
1052 * Returns: 0 on success, -ESTALE if the LVB is invalid
1053 */
1054
1055static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1056			    struct gfs2_statfs_change_host *sc)
1057{
1058	gfs2_rgrp_verify(rgd);
1059	sc->sc_total += rgd->rd_data;
1060	sc->sc_free += rgd->rd_free;
1061	sc->sc_dinodes += rgd->rd_dinodes;
1062	return 0;
1063}
1064
1065/**
1066 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1067 * @sdp: the filesystem
1068 * @sc: the sc info that will be returned
1069 *
1070 * Any error (other than a signal) will cause this routine to fall back
1071 * to the synchronous version.
1072 *
1073 * FIXME: This really shouldn't busy wait like this.
1074 *
1075 * Returns: errno
1076 */
1077
1078static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1079{
1080	struct gfs2_rgrpd *rgd_next;
1081	struct gfs2_holder *gha, *gh;
1082	unsigned int slots = 64;
1083	unsigned int x;
1084	int done;
1085	int error = 0, err;
1086
1087	memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1088	gha = kmalloc(slots * sizeof(struct gfs2_holder), GFP_KERNEL);
1089	if (!gha)
1090		return -ENOMEM;
1091	for (x = 0; x < slots; x++)
1092		gfs2_holder_mark_uninitialized(gha + x);
1093
1094	rgd_next = gfs2_rgrpd_get_first(sdp);
1095
1096	for (;;) {
1097		done = 1;
1098
1099		for (x = 0; x < slots; x++) {
1100			gh = gha + x;
1101
1102			if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
1103				err = gfs2_glock_wait(gh);
1104				if (err) {
1105					gfs2_holder_uninit(gh);
1106					error = err;
1107				} else {
1108					if (!error) {
1109						struct gfs2_rgrpd *rgd =
1110							gfs2_glock2rgrp(gh->gh_gl);
1111
1112						error = statfs_slow_fill(rgd, sc);
1113					}
1114					gfs2_glock_dq_uninit(gh);
1115				}
1116			}
1117
1118			if (gfs2_holder_initialized(gh))
1119				done = 0;
1120			else if (rgd_next && !error) {
1121				error = gfs2_glock_nq_init(rgd_next->rd_gl,
1122							   LM_ST_SHARED,
1123							   GL_ASYNC,
1124							   gh);
1125				rgd_next = gfs2_rgrpd_get_next(rgd_next);
1126				done = 0;
1127			}
1128
1129			if (signal_pending(current))
1130				error = -ERESTARTSYS;
1131		}
1132
1133		if (done)
1134			break;
1135
1136		yield();
1137	}
1138
1139	kfree(gha);
1140	return error;
1141}
1142
1143/**
1144 * gfs2_statfs_i - Do a statfs
1145 * @sdp: the filesystem
1146 * @sg: the sg structure
1147 *
1148 * Returns: errno
1149 */
1150
1151static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1152{
1153	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1154	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1155
1156	spin_lock(&sdp->sd_statfs_spin);
1157
1158	*sc = *m_sc;
1159	sc->sc_total += l_sc->sc_total;
1160	sc->sc_free += l_sc->sc_free;
1161	sc->sc_dinodes += l_sc->sc_dinodes;
1162
1163	spin_unlock(&sdp->sd_statfs_spin);
1164
1165	if (sc->sc_free < 0)
1166		sc->sc_free = 0;
1167	if (sc->sc_free > sc->sc_total)
1168		sc->sc_free = sc->sc_total;
1169	if (sc->sc_dinodes < 0)
1170		sc->sc_dinodes = 0;
1171
1172	return 0;
1173}
1174
1175/**
1176 * gfs2_statfs - Gather and return stats about the filesystem
1177 * @sb: The superblock
1178 * @statfsbuf: The buffer
1179 *
1180 * Returns: 0 on success or error code
1181 */
1182
1183static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1184{
1185	struct super_block *sb = dentry->d_sb;
1186	struct gfs2_sbd *sdp = sb->s_fs_info;
1187	struct gfs2_statfs_change_host sc;
1188	int error;
1189
1190	error = gfs2_rindex_update(sdp);
1191	if (error)
1192		return error;
1193
1194	if (gfs2_tune_get(sdp, gt_statfs_slow))
1195		error = gfs2_statfs_slow(sdp, &sc);
1196	else
1197		error = gfs2_statfs_i(sdp, &sc);
1198
1199	if (error)
1200		return error;
1201
1202	buf->f_type = GFS2_MAGIC;
1203	buf->f_bsize = sdp->sd_sb.sb_bsize;
1204	buf->f_blocks = sc.sc_total;
1205	buf->f_bfree = sc.sc_free;
1206	buf->f_bavail = sc.sc_free;
1207	buf->f_files = sc.sc_dinodes + sc.sc_free;
1208	buf->f_ffree = sc.sc_free;
1209	buf->f_namelen = GFS2_FNAMESIZE;
1210
1211	return 0;
1212}
1213
1214/**
1215 * gfs2_remount_fs - called when the FS is remounted
1216 * @sb:  the filesystem
1217 * @flags:  the remount flags
1218 * @data:  extra data passed in (not used right now)
1219 *
1220 * Returns: errno
1221 */
1222
1223static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1224{
1225	struct gfs2_sbd *sdp = sb->s_fs_info;
1226	struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1227	struct gfs2_tune *gt = &sdp->sd_tune;
1228	int error;
1229
1230	sync_filesystem(sb);
1231
1232	spin_lock(&gt->gt_spin);
1233	args.ar_commit = gt->gt_logd_secs;
1234	args.ar_quota_quantum = gt->gt_quota_quantum;
1235	if (gt->gt_statfs_slow)
1236		args.ar_statfs_quantum = 0;
1237	else
1238		args.ar_statfs_quantum = gt->gt_statfs_quantum;
1239	spin_unlock(&gt->gt_spin);
1240	error = gfs2_mount_args(&args, data);
1241	if (error)
1242		return error;
1243
1244	/* Not allowed to change locking details */
1245	if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1246	    strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1247	    strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1248		return -EINVAL;
1249
1250	/* Some flags must not be changed */
1251	if (args_neq(&args, &sdp->sd_args, spectator) ||
1252	    args_neq(&args, &sdp->sd_args, localflocks) ||
1253	    args_neq(&args, &sdp->sd_args, meta))
1254		return -EINVAL;
1255
1256	if (sdp->sd_args.ar_spectator)
1257		*flags |= MS_RDONLY;
1258
1259	if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1260		if (*flags & MS_RDONLY)
1261			error = gfs2_make_fs_ro(sdp);
1262		else
1263			error = gfs2_make_fs_rw(sdp);
1264		if (error)
1265			return error;
1266	}
1267
1268	sdp->sd_args = args;
1269	if (sdp->sd_args.ar_posix_acl)
1270		sb->s_flags |= MS_POSIXACL;
1271	else
1272		sb->s_flags &= ~MS_POSIXACL;
1273	if (sdp->sd_args.ar_nobarrier)
1274		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1275	else
1276		clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1277	spin_lock(&gt->gt_spin);
1278	gt->gt_logd_secs = args.ar_commit;
1279	gt->gt_quota_quantum = args.ar_quota_quantum;
1280	if (args.ar_statfs_quantum) {
1281		gt->gt_statfs_slow = 0;
1282		gt->gt_statfs_quantum = args.ar_statfs_quantum;
1283	}
1284	else {
1285		gt->gt_statfs_slow = 1;
1286		gt->gt_statfs_quantum = 30;
1287	}
1288	spin_unlock(&gt->gt_spin);
1289
1290	gfs2_online_uevent(sdp);
1291	return 0;
1292}
1293
1294/**
1295 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1296 * @inode: The inode to drop
1297 *
1298 * If we've received a callback on an iopen lock then its because a
1299 * remote node tried to deallocate the inode but failed due to this node
1300 * still having the inode open. Here we mark the link count zero
1301 * since we know that it must have reached zero if the GLF_DEMOTE flag
1302 * is set on the iopen glock. If we didn't do a disk read since the
1303 * remote node removed the final link then we might otherwise miss
1304 * this event. This check ensures that this node will deallocate the
1305 * inode's blocks, or alternatively pass the baton on to another
1306 * node for later deallocation.
1307 */
1308
1309static int gfs2_drop_inode(struct inode *inode)
1310{
1311	struct gfs2_inode *ip = GFS2_I(inode);
1312
1313	if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1314	    inode->i_nlink &&
1315	    gfs2_holder_initialized(&ip->i_iopen_gh)) {
1316		struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1317		if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1318			clear_nlink(inode);
1319	}
1320	return generic_drop_inode(inode);
1321}
1322
1323static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1324{
1325	do {
1326		if (d1 == d2)
1327			return 1;
1328		d1 = d1->d_parent;
1329	} while (!IS_ROOT(d1));
1330	return 0;
1331}
1332
1333/**
1334 * gfs2_show_options - Show mount options for /proc/mounts
1335 * @s: seq_file structure
1336 * @root: root of this (sub)tree
1337 *
1338 * Returns: 0 on success or error code
1339 */
1340
1341static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1342{
1343	struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1344	struct gfs2_args *args = &sdp->sd_args;
1345	int val;
1346
1347	if (is_ancestor(root, sdp->sd_master_dir))
1348		seq_puts(s, ",meta");
1349	if (args->ar_lockproto[0])
1350		seq_show_option(s, "lockproto", args->ar_lockproto);
1351	if (args->ar_locktable[0])
1352		seq_show_option(s, "locktable", args->ar_locktable);
1353	if (args->ar_hostdata[0])
1354		seq_show_option(s, "hostdata", args->ar_hostdata);
1355	if (args->ar_spectator)
1356		seq_puts(s, ",spectator");
1357	if (args->ar_localflocks)
1358		seq_puts(s, ",localflocks");
1359	if (args->ar_debug)
1360		seq_puts(s, ",debug");
1361	if (args->ar_posix_acl)
1362		seq_puts(s, ",acl");
1363	if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1364		char *state;
1365		switch (args->ar_quota) {
1366		case GFS2_QUOTA_OFF:
1367			state = "off";
1368			break;
1369		case GFS2_QUOTA_ACCOUNT:
1370			state = "account";
1371			break;
1372		case GFS2_QUOTA_ON:
1373			state = "on";
1374			break;
1375		default:
1376			state = "unknown";
1377			break;
1378		}
1379		seq_printf(s, ",quota=%s", state);
1380	}
1381	if (args->ar_suiddir)
1382		seq_puts(s, ",suiddir");
1383	if (args->ar_data != GFS2_DATA_DEFAULT) {
1384		char *state;
1385		switch (args->ar_data) {
1386		case GFS2_DATA_WRITEBACK:
1387			state = "writeback";
1388			break;
1389		case GFS2_DATA_ORDERED:
1390			state = "ordered";
1391			break;
1392		default:
1393			state = "unknown";
1394			break;
1395		}
1396		seq_printf(s, ",data=%s", state);
1397	}
1398	if (args->ar_discard)
1399		seq_puts(s, ",discard");
1400	val = sdp->sd_tune.gt_logd_secs;
1401	if (val != 30)
1402		seq_printf(s, ",commit=%d", val);
1403	val = sdp->sd_tune.gt_statfs_quantum;
1404	if (val != 30)
1405		seq_printf(s, ",statfs_quantum=%d", val);
1406	else if (sdp->sd_tune.gt_statfs_slow)
1407		seq_puts(s, ",statfs_quantum=0");
1408	val = sdp->sd_tune.gt_quota_quantum;
1409	if (val != 60)
1410		seq_printf(s, ",quota_quantum=%d", val);
1411	if (args->ar_statfs_percent)
1412		seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1413	if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1414		const char *state;
1415
1416		switch (args->ar_errors) {
1417		case GFS2_ERRORS_WITHDRAW:
1418			state = "withdraw";
1419			break;
1420		case GFS2_ERRORS_PANIC:
1421			state = "panic";
1422			break;
1423		default:
1424			state = "unknown";
1425			break;
1426		}
1427		seq_printf(s, ",errors=%s", state);
1428	}
1429	if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1430		seq_puts(s, ",nobarrier");
1431	if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1432		seq_puts(s, ",demote_interface_used");
1433	if (args->ar_rgrplvb)
1434		seq_puts(s, ",rgrplvb");
1435	if (args->ar_loccookie)
1436		seq_puts(s, ",loccookie");
1437	return 0;
1438}
1439
1440static void gfs2_final_release_pages(struct gfs2_inode *ip)
1441{
1442	struct inode *inode = &ip->i_inode;
1443	struct gfs2_glock *gl = ip->i_gl;
1444
1445	truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1446	truncate_inode_pages(&inode->i_data, 0);
1447
1448	if (atomic_read(&gl->gl_revokes) == 0) {
1449		clear_bit(GLF_LFLUSH, &gl->gl_flags);
1450		clear_bit(GLF_DIRTY, &gl->gl_flags);
1451	}
1452}
1453
1454static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1455{
1456	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1457	struct gfs2_rgrpd *rgd;
1458	struct gfs2_holder gh;
1459	int error;
1460
1461	if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1462		gfs2_consist_inode(ip);
1463		return -EIO;
1464	}
1465
1466	error = gfs2_rindex_update(sdp);
1467	if (error)
1468		return error;
1469
1470	error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1471	if (error)
1472		return error;
1473
1474	rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1475	if (!rgd) {
1476		gfs2_consist_inode(ip);
1477		error = -EIO;
1478		goto out_qs;
1479	}
1480
1481	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1482	if (error)
1483		goto out_qs;
1484
1485	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1486				 sdp->sd_jdesc->jd_blocks);
1487	if (error)
1488		goto out_rg_gunlock;
1489
1490	gfs2_free_di(rgd, ip);
1491
1492	gfs2_final_release_pages(ip);
1493
1494	gfs2_trans_end(sdp);
1495
1496out_rg_gunlock:
1497	gfs2_glock_dq_uninit(&gh);
1498out_qs:
1499	gfs2_quota_unhold(ip);
1500	return error;
1501}
1502
1503/**
1504 * gfs2_evict_inode - Remove an inode from cache
1505 * @inode: The inode to evict
1506 *
1507 * There are three cases to consider:
1508 * 1. i_nlink == 0, we are final opener (and must deallocate)
1509 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1510 * 3. i_nlink > 0
1511 *
1512 * If the fs is read only, then we have to treat all cases as per #3
1513 * since we are unable to do any deallocation. The inode will be
1514 * deallocated by the next read/write node to attempt an allocation
1515 * in the same resource group
1516 *
1517 * We have to (at the moment) hold the inodes main lock to cover
1518 * the gap between unlocking the shared lock on the iopen lock and
1519 * taking the exclusive lock. I'd rather do a shared -> exclusive
1520 * conversion on the iopen lock, but we can change that later. This
1521 * is safe, just less efficient.
1522 */
1523
1524static void gfs2_evict_inode(struct inode *inode)
1525{
1526	struct super_block *sb = inode->i_sb;
1527	struct gfs2_sbd *sdp = sb->s_fs_info;
1528	struct gfs2_inode *ip = GFS2_I(inode);
1529	struct gfs2_holder gh;
1530	struct address_space *metamapping;
1531	int error;
1532
1533	if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1534		clear_inode(inode);
1535		return;
1536	}
1537
1538	if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1539		goto out;
1540
1541	if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1542		BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1543		gfs2_holder_mark_uninitialized(&gh);
1544		goto alloc_failed;
1545	}
1546
1547	/* Must not read inode block until block type has been verified */
1548	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1549	if (unlikely(error)) {
1550		ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1551		gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1552		goto out;
1553	}
1554
1555	error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1556	if (error)
1557		goto out_truncate;
1558
1559	if (test_bit(GIF_INVALID, &ip->i_flags)) {
1560		error = gfs2_inode_refresh(ip);
1561		if (error)
1562			goto out_truncate;
1563	}
1564
1565alloc_failed:
1566	if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1567	    test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1568		ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1569		gfs2_glock_dq_wait(&ip->i_iopen_gh);
1570		gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1571				   &ip->i_iopen_gh);
1572		error = gfs2_glock_nq(&ip->i_iopen_gh);
1573		if (error)
1574			goto out_truncate;
1575	}
1576
1577	/* Case 1 starts here */
1578
1579	if (S_ISDIR(inode->i_mode) &&
1580	    (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1581		error = gfs2_dir_exhash_dealloc(ip);
1582		if (error)
1583			goto out_unlock;
1584	}
1585
1586	if (ip->i_eattr) {
1587		error = gfs2_ea_dealloc(ip);
1588		if (error)
1589			goto out_unlock;
1590	}
1591
1592	if (!gfs2_is_stuffed(ip)) {
1593		error = gfs2_file_dealloc(ip);
1594		if (error)
1595			goto out_unlock;
1596	}
1597
1598	error = gfs2_dinode_dealloc(ip);
1599	goto out_unlock;
1600
1601out_truncate:
1602	gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
1603	metamapping = gfs2_glock2aspace(ip->i_gl);
1604	if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1605		filemap_fdatawrite(metamapping);
1606		filemap_fdatawait(metamapping);
1607	}
1608	write_inode_now(inode, 1);
1609	gfs2_ail_flush(ip->i_gl, 0);
1610
1611	/* Case 2 starts here */
1612	error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1613	if (error)
1614		goto out_unlock;
1615	/* Needs to be done before glock release & also in a transaction */
1616	truncate_inode_pages(&inode->i_data, 0);
1617	truncate_inode_pages(metamapping, 0);
1618	gfs2_trans_end(sdp);
1619
1620out_unlock:
1621	/* Error path for case 1 */
1622	if (gfs2_rs_active(&ip->i_res))
1623		gfs2_rs_deltree(&ip->i_res);
1624
1625	if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1626		if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1627			ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1628			gfs2_glock_dq(&ip->i_iopen_gh);
1629		}
1630		gfs2_holder_uninit(&ip->i_iopen_gh);
1631	}
1632	if (gfs2_holder_initialized(&gh))
1633		gfs2_glock_dq_uninit(&gh);
1634	if (error && error != GLR_TRYFAILED && error != -EROFS)
1635		fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1636out:
1637	/* Case 3 starts here */
1638	truncate_inode_pages_final(&inode->i_data);
1639	gfs2_rsqa_delete(ip, NULL);
1640	gfs2_ordered_del_inode(ip);
1641	clear_inode(inode);
1642	gfs2_dir_hash_inval(ip);
1643	glock_set_object(ip->i_gl, NULL);
1644	wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1645	gfs2_glock_add_to_lru(ip->i_gl);
1646	gfs2_glock_put(ip->i_gl);
1647	ip->i_gl = NULL;
1648	if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1649		glock_set_object(ip->i_iopen_gh.gh_gl, NULL);
1650		ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1651		gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1652	}
1653}
1654
1655static struct inode *gfs2_alloc_inode(struct super_block *sb)
1656{
1657	struct gfs2_inode *ip;
1658
1659	ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1660	if (ip) {
1661		ip->i_flags = 0;
1662		ip->i_gl = NULL;
1663		ip->i_rgd = NULL;
1664		memset(&ip->i_res, 0, sizeof(ip->i_res));
1665		RB_CLEAR_NODE(&ip->i_res.rs_node);
1666		ip->i_rahead = 0;
1667	}
1668	return &ip->i_inode;
1669}
1670
1671static void gfs2_i_callback(struct rcu_head *head)
1672{
1673	struct inode *inode = container_of(head, struct inode, i_rcu);
1674	kmem_cache_free(gfs2_inode_cachep, inode);
1675}
1676
1677static void gfs2_destroy_inode(struct inode *inode)
1678{
1679	call_rcu(&inode->i_rcu, gfs2_i_callback);
1680}
1681
1682const struct super_operations gfs2_super_ops = {
1683	.alloc_inode		= gfs2_alloc_inode,
1684	.destroy_inode		= gfs2_destroy_inode,
1685	.write_inode		= gfs2_write_inode,
1686	.dirty_inode		= gfs2_dirty_inode,
1687	.evict_inode		= gfs2_evict_inode,
1688	.put_super		= gfs2_put_super,
1689	.sync_fs		= gfs2_sync_fs,
1690	.freeze_super		= gfs2_freeze,
1691	.thaw_super		= gfs2_unfreeze,
1692	.statfs			= gfs2_statfs,
1693	.remount_fs		= gfs2_remount_fs,
1694	.drop_inode		= gfs2_drop_inode,
1695	.show_options		= gfs2_show_options,
1696};
1697