xref: /openbmc/linux/fs/gfs2/super.c (revision 018cbffe6819f6f8db20a0a3acd9bab9bfd667e4)
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 #include <linux/bio.h>
11 #include <linux/sched.h>
12 #include <linux/slab.h>
13 #include <linux/spinlock.h>
14 #include <linux/completion.h>
15 #include <linux/buffer_head.h>
16 #include <linux/statfs.h>
17 #include <linux/seq_file.h>
18 #include <linux/mount.h>
19 #include <linux/kthread.h>
20 #include <linux/delay.h>
21 #include <linux/gfs2_ondisk.h>
22 #include <linux/crc32.h>
23 #include <linux/time.h>
24 #include <linux/wait.h>
25 
26 #include "gfs2.h"
27 #include "incore.h"
28 #include "bmap.h"
29 #include "dir.h"
30 #include "glock.h"
31 #include "glops.h"
32 #include "inode.h"
33 #include "log.h"
34 #include "meta_io.h"
35 #include "quota.h"
36 #include "recovery.h"
37 #include "rgrp.h"
38 #include "super.h"
39 #include "trans.h"
40 #include "util.h"
41 #include "sys.h"
42 #include "xattr.h"
43 
44 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
45 
46 enum {
47 	Opt_lockproto,
48 	Opt_locktable,
49 	Opt_hostdata,
50 	Opt_spectator,
51 	Opt_ignore_local_fs,
52 	Opt_localflocks,
53 	Opt_localcaching,
54 	Opt_debug,
55 	Opt_nodebug,
56 	Opt_upgrade,
57 	Opt_acl,
58 	Opt_noacl,
59 	Opt_quota_off,
60 	Opt_quota_account,
61 	Opt_quota_on,
62 	Opt_quota,
63 	Opt_noquota,
64 	Opt_suiddir,
65 	Opt_nosuiddir,
66 	Opt_data_writeback,
67 	Opt_data_ordered,
68 	Opt_meta,
69 	Opt_discard,
70 	Opt_nodiscard,
71 	Opt_commit,
72 	Opt_err_withdraw,
73 	Opt_err_panic,
74 	Opt_statfs_quantum,
75 	Opt_statfs_percent,
76 	Opt_quota_quantum,
77 	Opt_barrier,
78 	Opt_nobarrier,
79 	Opt_error,
80 };
81 
82 static const match_table_t tokens = {
83 	{Opt_lockproto, "lockproto=%s"},
84 	{Opt_locktable, "locktable=%s"},
85 	{Opt_hostdata, "hostdata=%s"},
86 	{Opt_spectator, "spectator"},
87 	{Opt_ignore_local_fs, "ignore_local_fs"},
88 	{Opt_localflocks, "localflocks"},
89 	{Opt_localcaching, "localcaching"},
90 	{Opt_debug, "debug"},
91 	{Opt_nodebug, "nodebug"},
92 	{Opt_upgrade, "upgrade"},
93 	{Opt_acl, "acl"},
94 	{Opt_noacl, "noacl"},
95 	{Opt_quota_off, "quota=off"},
96 	{Opt_quota_account, "quota=account"},
97 	{Opt_quota_on, "quota=on"},
98 	{Opt_quota, "quota"},
99 	{Opt_noquota, "noquota"},
100 	{Opt_suiddir, "suiddir"},
101 	{Opt_nosuiddir, "nosuiddir"},
102 	{Opt_data_writeback, "data=writeback"},
103 	{Opt_data_ordered, "data=ordered"},
104 	{Opt_meta, "meta"},
105 	{Opt_discard, "discard"},
106 	{Opt_nodiscard, "nodiscard"},
107 	{Opt_commit, "commit=%d"},
108 	{Opt_err_withdraw, "errors=withdraw"},
109 	{Opt_err_panic, "errors=panic"},
110 	{Opt_statfs_quantum, "statfs_quantum=%d"},
111 	{Opt_statfs_percent, "statfs_percent=%d"},
112 	{Opt_quota_quantum, "quota_quantum=%d"},
113 	{Opt_barrier, "barrier"},
114 	{Opt_nobarrier, "nobarrier"},
115 	{Opt_error, NULL}
116 };
117 
118 /**
119  * gfs2_mount_args - Parse mount options
120  * @args: The structure into which the parsed options will be written
121  * @options: The options to parse
122  *
123  * Return: errno
124  */
125 
126 int gfs2_mount_args(struct gfs2_args *args, char *options)
127 {
128 	char *o;
129 	int token;
130 	substring_t tmp[MAX_OPT_ARGS];
131 	int rv;
132 
133 	/* Split the options into tokens with the "," character and
134 	   process them */
135 
136 	while (1) {
137 		o = strsep(&options, ",");
138 		if (o == NULL)
139 			break;
140 		if (*o == '\0')
141 			continue;
142 
143 		token = match_token(o, tokens, tmp);
144 		switch (token) {
145 		case Opt_lockproto:
146 			match_strlcpy(args->ar_lockproto, &tmp[0],
147 				      GFS2_LOCKNAME_LEN);
148 			break;
149 		case Opt_locktable:
150 			match_strlcpy(args->ar_locktable, &tmp[0],
151 				      GFS2_LOCKNAME_LEN);
152 			break;
153 		case Opt_hostdata:
154 			match_strlcpy(args->ar_hostdata, &tmp[0],
155 				      GFS2_LOCKNAME_LEN);
156 			break;
157 		case Opt_spectator:
158 			args->ar_spectator = 1;
159 			break;
160 		case Opt_ignore_local_fs:
161 			args->ar_ignore_local_fs = 1;
162 			break;
163 		case Opt_localflocks:
164 			args->ar_localflocks = 1;
165 			break;
166 		case Opt_localcaching:
167 			args->ar_localcaching = 1;
168 			break;
169 		case Opt_debug:
170 			if (args->ar_errors == GFS2_ERRORS_PANIC) {
171 				printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
172 				       "are mutually exclusive.\n");
173 				return -EINVAL;
174 			}
175 			args->ar_debug = 1;
176 			break;
177 		case Opt_nodebug:
178 			args->ar_debug = 0;
179 			break;
180 		case Opt_upgrade:
181 			args->ar_upgrade = 1;
182 			break;
183 		case Opt_acl:
184 			args->ar_posix_acl = 1;
185 			break;
186 		case Opt_noacl:
187 			args->ar_posix_acl = 0;
188 			break;
189 		case Opt_quota_off:
190 		case Opt_noquota:
191 			args->ar_quota = GFS2_QUOTA_OFF;
192 			break;
193 		case Opt_quota_account:
194 			args->ar_quota = GFS2_QUOTA_ACCOUNT;
195 			break;
196 		case Opt_quota_on:
197 		case Opt_quota:
198 			args->ar_quota = GFS2_QUOTA_ON;
199 			break;
200 		case Opt_suiddir:
201 			args->ar_suiddir = 1;
202 			break;
203 		case Opt_nosuiddir:
204 			args->ar_suiddir = 0;
205 			break;
206 		case Opt_data_writeback:
207 			args->ar_data = GFS2_DATA_WRITEBACK;
208 			break;
209 		case Opt_data_ordered:
210 			args->ar_data = GFS2_DATA_ORDERED;
211 			break;
212 		case Opt_meta:
213 			args->ar_meta = 1;
214 			break;
215 		case Opt_discard:
216 			args->ar_discard = 1;
217 			break;
218 		case Opt_nodiscard:
219 			args->ar_discard = 0;
220 			break;
221 		case Opt_commit:
222 			rv = match_int(&tmp[0], &args->ar_commit);
223 			if (rv || args->ar_commit <= 0) {
224 				printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
225 				return rv ? rv : -EINVAL;
226 			}
227 			break;
228 		case Opt_statfs_quantum:
229 			rv = match_int(&tmp[0], &args->ar_statfs_quantum);
230 			if (rv || args->ar_statfs_quantum < 0) {
231 				printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
232 				return rv ? rv : -EINVAL;
233 			}
234 			break;
235 		case Opt_quota_quantum:
236 			rv = match_int(&tmp[0], &args->ar_quota_quantum);
237 			if (rv || args->ar_quota_quantum <= 0) {
238 				printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
239 				return rv ? rv : -EINVAL;
240 			}
241 			break;
242 		case Opt_statfs_percent:
243 			rv = match_int(&tmp[0], &args->ar_statfs_percent);
244 			if (rv || args->ar_statfs_percent < 0 ||
245 			    args->ar_statfs_percent > 100) {
246 				printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
247 				return rv ? rv : -EINVAL;
248 			}
249 			break;
250 		case Opt_err_withdraw:
251 			args->ar_errors = GFS2_ERRORS_WITHDRAW;
252 			break;
253 		case Opt_err_panic:
254 			if (args->ar_debug) {
255 				printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
256 					"are mutually exclusive.\n");
257 				return -EINVAL;
258 			}
259 			args->ar_errors = GFS2_ERRORS_PANIC;
260 			break;
261 		case Opt_barrier:
262 			args->ar_nobarrier = 0;
263 			break;
264 		case Opt_nobarrier:
265 			args->ar_nobarrier = 1;
266 			break;
267 		case Opt_error:
268 		default:
269 			printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
270 			return -EINVAL;
271 		}
272 	}
273 
274 	return 0;
275 }
276 
277 /**
278  * gfs2_jindex_free - Clear all the journal index information
279  * @sdp: The GFS2 superblock
280  *
281  */
282 
283 void gfs2_jindex_free(struct gfs2_sbd *sdp)
284 {
285 	struct list_head list, *head;
286 	struct gfs2_jdesc *jd;
287 	struct gfs2_journal_extent *jext;
288 
289 	spin_lock(&sdp->sd_jindex_spin);
290 	list_add(&list, &sdp->sd_jindex_list);
291 	list_del_init(&sdp->sd_jindex_list);
292 	sdp->sd_journals = 0;
293 	spin_unlock(&sdp->sd_jindex_spin);
294 
295 	while (!list_empty(&list)) {
296 		jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
297 		head = &jd->extent_list;
298 		while (!list_empty(head)) {
299 			jext = list_entry(head->next,
300 					  struct gfs2_journal_extent,
301 					  extent_list);
302 			list_del(&jext->extent_list);
303 			kfree(jext);
304 		}
305 		list_del(&jd->jd_list);
306 		iput(jd->jd_inode);
307 		kfree(jd);
308 	}
309 }
310 
311 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
312 {
313 	struct gfs2_jdesc *jd;
314 	int found = 0;
315 
316 	list_for_each_entry(jd, head, jd_list) {
317 		if (jd->jd_jid == jid) {
318 			found = 1;
319 			break;
320 		}
321 	}
322 
323 	if (!found)
324 		jd = NULL;
325 
326 	return jd;
327 }
328 
329 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
330 {
331 	struct gfs2_jdesc *jd;
332 
333 	spin_lock(&sdp->sd_jindex_spin);
334 	jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
335 	spin_unlock(&sdp->sd_jindex_spin);
336 
337 	return jd;
338 }
339 
340 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
341 {
342 	struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
343 	struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
344 	int ar;
345 	int error;
346 
347 	if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
348 	    (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
349 		gfs2_consist_inode(ip);
350 		return -EIO;
351 	}
352 	jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
353 
354 	error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
355 	if (!error && ar) {
356 		gfs2_consist_inode(ip);
357 		error = -EIO;
358 	}
359 
360 	return error;
361 }
362 
363 /**
364  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
365  * @sdp: the filesystem
366  *
367  * Returns: errno
368  */
369 
370 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
371 {
372 	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
373 	struct gfs2_glock *j_gl = ip->i_gl;
374 	struct gfs2_holder t_gh;
375 	struct gfs2_log_header_host head;
376 	int error;
377 
378 	error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
379 	if (error)
380 		return error;
381 
382 	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
383 
384 	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
385 	if (error)
386 		goto fail;
387 
388 	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
389 		gfs2_consist(sdp);
390 		error = -EIO;
391 		goto fail;
392 	}
393 
394 	/*  Initialize some head of the log stuff  */
395 	sdp->sd_log_sequence = head.lh_sequence + 1;
396 	gfs2_log_pointers_init(sdp, head.lh_blkno);
397 
398 	error = gfs2_quota_init(sdp);
399 	if (error)
400 		goto fail;
401 
402 	set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
403 
404 	gfs2_glock_dq_uninit(&t_gh);
405 
406 	return 0;
407 
408 fail:
409 	t_gh.gh_flags |= GL_NOCACHE;
410 	gfs2_glock_dq_uninit(&t_gh);
411 
412 	return error;
413 }
414 
415 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
416 {
417 	const struct gfs2_statfs_change *str = buf;
418 
419 	sc->sc_total = be64_to_cpu(str->sc_total);
420 	sc->sc_free = be64_to_cpu(str->sc_free);
421 	sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
422 }
423 
424 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
425 {
426 	struct gfs2_statfs_change *str = buf;
427 
428 	str->sc_total = cpu_to_be64(sc->sc_total);
429 	str->sc_free = cpu_to_be64(sc->sc_free);
430 	str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
431 }
432 
433 int gfs2_statfs_init(struct gfs2_sbd *sdp)
434 {
435 	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
436 	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
437 	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
438 	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
439 	struct buffer_head *m_bh, *l_bh;
440 	struct gfs2_holder gh;
441 	int error;
442 
443 	error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
444 				   &gh);
445 	if (error)
446 		return error;
447 
448 	error = gfs2_meta_inode_buffer(m_ip, &m_bh);
449 	if (error)
450 		goto out;
451 
452 	if (sdp->sd_args.ar_spectator) {
453 		spin_lock(&sdp->sd_statfs_spin);
454 		gfs2_statfs_change_in(m_sc, m_bh->b_data +
455 				      sizeof(struct gfs2_dinode));
456 		spin_unlock(&sdp->sd_statfs_spin);
457 	} else {
458 		error = gfs2_meta_inode_buffer(l_ip, &l_bh);
459 		if (error)
460 			goto out_m_bh;
461 
462 		spin_lock(&sdp->sd_statfs_spin);
463 		gfs2_statfs_change_in(m_sc, m_bh->b_data +
464 				      sizeof(struct gfs2_dinode));
465 		gfs2_statfs_change_in(l_sc, l_bh->b_data +
466 				      sizeof(struct gfs2_dinode));
467 		spin_unlock(&sdp->sd_statfs_spin);
468 
469 		brelse(l_bh);
470 	}
471 
472 out_m_bh:
473 	brelse(m_bh);
474 out:
475 	gfs2_glock_dq_uninit(&gh);
476 	return 0;
477 }
478 
479 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
480 			s64 dinodes)
481 {
482 	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
483 	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
484 	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
485 	struct buffer_head *l_bh;
486 	s64 x, y;
487 	int need_sync = 0;
488 	int error;
489 
490 	error = gfs2_meta_inode_buffer(l_ip, &l_bh);
491 	if (error)
492 		return;
493 
494 	gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
495 
496 	spin_lock(&sdp->sd_statfs_spin);
497 	l_sc->sc_total += total;
498 	l_sc->sc_free += free;
499 	l_sc->sc_dinodes += dinodes;
500 	gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
501 	if (sdp->sd_args.ar_statfs_percent) {
502 		x = 100 * l_sc->sc_free;
503 		y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
504 		if (x >= y || x <= -y)
505 			need_sync = 1;
506 	}
507 	spin_unlock(&sdp->sd_statfs_spin);
508 
509 	brelse(l_bh);
510 	if (need_sync)
511 		gfs2_wake_up_statfs(sdp);
512 }
513 
514 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
515 		   struct buffer_head *l_bh)
516 {
517 	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
518 	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
519 	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
520 	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
521 
522 	gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
523 
524 	spin_lock(&sdp->sd_statfs_spin);
525 	m_sc->sc_total += l_sc->sc_total;
526 	m_sc->sc_free += l_sc->sc_free;
527 	m_sc->sc_dinodes += l_sc->sc_dinodes;
528 	memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
529 	memset(l_bh->b_data + sizeof(struct gfs2_dinode),
530 	       0, sizeof(struct gfs2_statfs_change));
531 	spin_unlock(&sdp->sd_statfs_spin);
532 
533 	gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
534 	gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
535 }
536 
537 int gfs2_statfs_sync(struct super_block *sb, int type)
538 {
539 	struct gfs2_sbd *sdp = sb->s_fs_info;
540 	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
541 	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
542 	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
543 	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
544 	struct gfs2_holder gh;
545 	struct buffer_head *m_bh, *l_bh;
546 	int error;
547 
548 	error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
549 				   &gh);
550 	if (error)
551 		return error;
552 
553 	error = gfs2_meta_inode_buffer(m_ip, &m_bh);
554 	if (error)
555 		goto out;
556 
557 	spin_lock(&sdp->sd_statfs_spin);
558 	gfs2_statfs_change_in(m_sc, m_bh->b_data +
559 			      sizeof(struct gfs2_dinode));
560 	if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
561 		spin_unlock(&sdp->sd_statfs_spin);
562 		goto out_bh;
563 	}
564 	spin_unlock(&sdp->sd_statfs_spin);
565 
566 	error = gfs2_meta_inode_buffer(l_ip, &l_bh);
567 	if (error)
568 		goto out_bh;
569 
570 	error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
571 	if (error)
572 		goto out_bh2;
573 
574 	update_statfs(sdp, m_bh, l_bh);
575 	sdp->sd_statfs_force_sync = 0;
576 
577 	gfs2_trans_end(sdp);
578 
579 out_bh2:
580 	brelse(l_bh);
581 out_bh:
582 	brelse(m_bh);
583 out:
584 	gfs2_glock_dq_uninit(&gh);
585 	return error;
586 }
587 
588 struct lfcc {
589 	struct list_head list;
590 	struct gfs2_holder gh;
591 };
592 
593 /**
594  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
595  *                            journals are clean
596  * @sdp: the file system
597  * @state: the state to put the transaction lock into
598  * @t_gh: the hold on the transaction lock
599  *
600  * Returns: errno
601  */
602 
603 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
604 				    struct gfs2_holder *t_gh)
605 {
606 	struct gfs2_inode *ip;
607 	struct gfs2_jdesc *jd;
608 	struct lfcc *lfcc;
609 	LIST_HEAD(list);
610 	struct gfs2_log_header_host lh;
611 	int error;
612 
613 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
614 		lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
615 		if (!lfcc) {
616 			error = -ENOMEM;
617 			goto out;
618 		}
619 		ip = GFS2_I(jd->jd_inode);
620 		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
621 		if (error) {
622 			kfree(lfcc);
623 			goto out;
624 		}
625 		list_add(&lfcc->list, &list);
626 	}
627 
628 	error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
629 				   GL_NOCACHE, t_gh);
630 
631 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
632 		error = gfs2_jdesc_check(jd);
633 		if (error)
634 			break;
635 		error = gfs2_find_jhead(jd, &lh);
636 		if (error)
637 			break;
638 		if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
639 			error = -EBUSY;
640 			break;
641 		}
642 	}
643 
644 	if (error)
645 		gfs2_glock_dq_uninit(t_gh);
646 
647 out:
648 	while (!list_empty(&list)) {
649 		lfcc = list_entry(list.next, struct lfcc, list);
650 		list_del(&lfcc->list);
651 		gfs2_glock_dq_uninit(&lfcc->gh);
652 		kfree(lfcc);
653 	}
654 	return error;
655 }
656 
657 /**
658  * gfs2_freeze_fs - freezes the file system
659  * @sdp: the file system
660  *
661  * This function flushes data and meta data for all machines by
662  * aquiring the transaction log exclusively.  All journals are
663  * ensured to be in a clean state as well.
664  *
665  * Returns: errno
666  */
667 
668 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
669 {
670 	int error = 0;
671 
672 	mutex_lock(&sdp->sd_freeze_lock);
673 
674 	if (!sdp->sd_freeze_count++) {
675 		error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
676 		if (error)
677 			sdp->sd_freeze_count--;
678 	}
679 
680 	mutex_unlock(&sdp->sd_freeze_lock);
681 
682 	return error;
683 }
684 
685 /**
686  * gfs2_unfreeze_fs - unfreezes the file system
687  * @sdp: the file system
688  *
689  * This function allows the file system to proceed by unlocking
690  * the exclusively held transaction lock.  Other GFS2 nodes are
691  * now free to acquire the lock shared and go on with their lives.
692  *
693  */
694 
695 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
696 {
697 	mutex_lock(&sdp->sd_freeze_lock);
698 
699 	if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
700 		gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
701 
702 	mutex_unlock(&sdp->sd_freeze_lock);
703 }
704 
705 
706 /**
707  * gfs2_write_inode - Make sure the inode is stable on the disk
708  * @inode: The inode
709  * @sync: synchronous write flag
710  *
711  * Returns: errno
712  */
713 
714 static int gfs2_write_inode(struct inode *inode, int sync)
715 {
716 	struct gfs2_inode *ip = GFS2_I(inode);
717 	struct gfs2_sbd *sdp = GFS2_SB(inode);
718 	struct gfs2_holder gh;
719 	struct buffer_head *bh;
720 	struct timespec atime;
721 	struct gfs2_dinode *di;
722 	int ret = 0;
723 
724 	/* Check this is a "normal" inode, etc */
725 	if (!test_bit(GIF_USER, &ip->i_flags) ||
726 	    (current->flags & PF_MEMALLOC))
727 		return 0;
728 	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
729 	if (ret)
730 		goto do_flush;
731 	ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
732 	if (ret)
733 		goto do_unlock;
734 	ret = gfs2_meta_inode_buffer(ip, &bh);
735 	if (ret == 0) {
736 		di = (struct gfs2_dinode *)bh->b_data;
737 		atime.tv_sec = be64_to_cpu(di->di_atime);
738 		atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
739 		if (timespec_compare(&inode->i_atime, &atime) > 0) {
740 			gfs2_trans_add_bh(ip->i_gl, bh, 1);
741 			gfs2_dinode_out(ip, bh->b_data);
742 		}
743 		brelse(bh);
744 	}
745 	gfs2_trans_end(sdp);
746 do_unlock:
747 	gfs2_glock_dq_uninit(&gh);
748 do_flush:
749 	if (sync != 0)
750 		gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
751 	return ret;
752 }
753 
754 /**
755  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
756  * @sdp: the filesystem
757  *
758  * Returns: errno
759  */
760 
761 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
762 {
763 	struct gfs2_holder t_gh;
764 	int error;
765 
766 	flush_workqueue(gfs2_delete_workqueue);
767 	gfs2_quota_sync(sdp->sd_vfs, 0);
768 	gfs2_statfs_sync(sdp->sd_vfs, 0);
769 
770 	error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
771 				   &t_gh);
772 	if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
773 		return error;
774 
775 	gfs2_meta_syncfs(sdp);
776 	gfs2_log_shutdown(sdp);
777 
778 	clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
779 
780 	if (t_gh.gh_gl)
781 		gfs2_glock_dq_uninit(&t_gh);
782 
783 	gfs2_quota_cleanup(sdp);
784 
785 	return error;
786 }
787 
788 static int gfs2_umount_recovery_wait(void *word)
789 {
790 	schedule();
791 	return 0;
792 }
793 
794 /**
795  * gfs2_put_super - Unmount the filesystem
796  * @sb: The VFS superblock
797  *
798  */
799 
800 static void gfs2_put_super(struct super_block *sb)
801 {
802 	struct gfs2_sbd *sdp = sb->s_fs_info;
803 	int error;
804 	struct gfs2_jdesc *jd;
805 
806 	/*  Unfreeze the filesystem, if we need to  */
807 
808 	mutex_lock(&sdp->sd_freeze_lock);
809 	if (sdp->sd_freeze_count)
810 		gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
811 	mutex_unlock(&sdp->sd_freeze_lock);
812 
813 	/* No more recovery requests */
814 	set_bit(SDF_NORECOVERY, &sdp->sd_flags);
815 	smp_mb();
816 
817 	/* Wait on outstanding recovery */
818 restart:
819 	spin_lock(&sdp->sd_jindex_spin);
820 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
821 		if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
822 			continue;
823 		spin_unlock(&sdp->sd_jindex_spin);
824 		wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
825 			    gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
826 		goto restart;
827 	}
828 	spin_unlock(&sdp->sd_jindex_spin);
829 
830 	kthread_stop(sdp->sd_quotad_process);
831 	kthread_stop(sdp->sd_logd_process);
832 
833 	if (!(sb->s_flags & MS_RDONLY)) {
834 		error = gfs2_make_fs_ro(sdp);
835 		if (error)
836 			gfs2_io_error(sdp);
837 	}
838 	/*  At this point, we're through modifying the disk  */
839 
840 	/*  Release stuff  */
841 
842 	iput(sdp->sd_jindex);
843 	iput(sdp->sd_statfs_inode);
844 	iput(sdp->sd_rindex);
845 	iput(sdp->sd_quota_inode);
846 
847 	gfs2_glock_put(sdp->sd_rename_gl);
848 	gfs2_glock_put(sdp->sd_trans_gl);
849 
850 	if (!sdp->sd_args.ar_spectator) {
851 		gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
852 		gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
853 		gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
854 		gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
855 		iput(sdp->sd_sc_inode);
856 		iput(sdp->sd_qc_inode);
857 	}
858 
859 	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
860 	gfs2_clear_rgrpd(sdp);
861 	gfs2_jindex_free(sdp);
862 	/*  Take apart glock structures and buffer lists  */
863 	gfs2_gl_hash_clear(sdp);
864 	/*  Unmount the locking protocol  */
865 	gfs2_lm_unmount(sdp);
866 
867 	/*  At this point, we're through participating in the lockspace  */
868 	gfs2_sys_fs_del(sdp);
869 }
870 
871 /**
872  * gfs2_sync_fs - sync the filesystem
873  * @sb: the superblock
874  *
875  * Flushes the log to disk.
876  */
877 
878 static int gfs2_sync_fs(struct super_block *sb, int wait)
879 {
880 	if (wait && sb->s_fs_info)
881 		gfs2_log_flush(sb->s_fs_info, NULL);
882 	return 0;
883 }
884 
885 /**
886  * gfs2_freeze - prevent further writes to the filesystem
887  * @sb: the VFS structure for the filesystem
888  *
889  */
890 
891 static int gfs2_freeze(struct super_block *sb)
892 {
893 	struct gfs2_sbd *sdp = sb->s_fs_info;
894 	int error;
895 
896 	if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
897 		return -EINVAL;
898 
899 	for (;;) {
900 		error = gfs2_freeze_fs(sdp);
901 		if (!error)
902 			break;
903 
904 		switch (error) {
905 		case -EBUSY:
906 			fs_err(sdp, "waiting for recovery before freeze\n");
907 			break;
908 
909 		default:
910 			fs_err(sdp, "error freezing FS: %d\n", error);
911 			break;
912 		}
913 
914 		fs_err(sdp, "retrying...\n");
915 		msleep(1000);
916 	}
917 	return 0;
918 }
919 
920 /**
921  * gfs2_unfreeze - reallow writes to the filesystem
922  * @sb: the VFS structure for the filesystem
923  *
924  */
925 
926 static int gfs2_unfreeze(struct super_block *sb)
927 {
928 	gfs2_unfreeze_fs(sb->s_fs_info);
929 	return 0;
930 }
931 
932 /**
933  * statfs_fill - fill in the sg for a given RG
934  * @rgd: the RG
935  * @sc: the sc structure
936  *
937  * Returns: 0 on success, -ESTALE if the LVB is invalid
938  */
939 
940 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
941 			    struct gfs2_statfs_change_host *sc)
942 {
943 	gfs2_rgrp_verify(rgd);
944 	sc->sc_total += rgd->rd_data;
945 	sc->sc_free += rgd->rd_free;
946 	sc->sc_dinodes += rgd->rd_dinodes;
947 	return 0;
948 }
949 
950 /**
951  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
952  * @sdp: the filesystem
953  * @sc: the sc info that will be returned
954  *
955  * Any error (other than a signal) will cause this routine to fall back
956  * to the synchronous version.
957  *
958  * FIXME: This really shouldn't busy wait like this.
959  *
960  * Returns: errno
961  */
962 
963 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
964 {
965 	struct gfs2_holder ri_gh;
966 	struct gfs2_rgrpd *rgd_next;
967 	struct gfs2_holder *gha, *gh;
968 	unsigned int slots = 64;
969 	unsigned int x;
970 	int done;
971 	int error = 0, err;
972 
973 	memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
974 	gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
975 	if (!gha)
976 		return -ENOMEM;
977 
978 	error = gfs2_rindex_hold(sdp, &ri_gh);
979 	if (error)
980 		goto out;
981 
982 	rgd_next = gfs2_rgrpd_get_first(sdp);
983 
984 	for (;;) {
985 		done = 1;
986 
987 		for (x = 0; x < slots; x++) {
988 			gh = gha + x;
989 
990 			if (gh->gh_gl && gfs2_glock_poll(gh)) {
991 				err = gfs2_glock_wait(gh);
992 				if (err) {
993 					gfs2_holder_uninit(gh);
994 					error = err;
995 				} else {
996 					if (!error)
997 						error = statfs_slow_fill(
998 							gh->gh_gl->gl_object, sc);
999 					gfs2_glock_dq_uninit(gh);
1000 				}
1001 			}
1002 
1003 			if (gh->gh_gl)
1004 				done = 0;
1005 			else if (rgd_next && !error) {
1006 				error = gfs2_glock_nq_init(rgd_next->rd_gl,
1007 							   LM_ST_SHARED,
1008 							   GL_ASYNC,
1009 							   gh);
1010 				rgd_next = gfs2_rgrpd_get_next(rgd_next);
1011 				done = 0;
1012 			}
1013 
1014 			if (signal_pending(current))
1015 				error = -ERESTARTSYS;
1016 		}
1017 
1018 		if (done)
1019 			break;
1020 
1021 		yield();
1022 	}
1023 
1024 	gfs2_glock_dq_uninit(&ri_gh);
1025 
1026 out:
1027 	kfree(gha);
1028 	return error;
1029 }
1030 
1031 /**
1032  * gfs2_statfs_i - Do a statfs
1033  * @sdp: the filesystem
1034  * @sg: the sg structure
1035  *
1036  * Returns: errno
1037  */
1038 
1039 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1040 {
1041 	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1042 	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1043 
1044 	spin_lock(&sdp->sd_statfs_spin);
1045 
1046 	*sc = *m_sc;
1047 	sc->sc_total += l_sc->sc_total;
1048 	sc->sc_free += l_sc->sc_free;
1049 	sc->sc_dinodes += l_sc->sc_dinodes;
1050 
1051 	spin_unlock(&sdp->sd_statfs_spin);
1052 
1053 	if (sc->sc_free < 0)
1054 		sc->sc_free = 0;
1055 	if (sc->sc_free > sc->sc_total)
1056 		sc->sc_free = sc->sc_total;
1057 	if (sc->sc_dinodes < 0)
1058 		sc->sc_dinodes = 0;
1059 
1060 	return 0;
1061 }
1062 
1063 /**
1064  * gfs2_statfs - Gather and return stats about the filesystem
1065  * @sb: The superblock
1066  * @statfsbuf: The buffer
1067  *
1068  * Returns: 0 on success or error code
1069  */
1070 
1071 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1072 {
1073 	struct super_block *sb = dentry->d_inode->i_sb;
1074 	struct gfs2_sbd *sdp = sb->s_fs_info;
1075 	struct gfs2_statfs_change_host sc;
1076 	int error;
1077 
1078 	if (gfs2_tune_get(sdp, gt_statfs_slow))
1079 		error = gfs2_statfs_slow(sdp, &sc);
1080 	else
1081 		error = gfs2_statfs_i(sdp, &sc);
1082 
1083 	if (error)
1084 		return error;
1085 
1086 	buf->f_type = GFS2_MAGIC;
1087 	buf->f_bsize = sdp->sd_sb.sb_bsize;
1088 	buf->f_blocks = sc.sc_total;
1089 	buf->f_bfree = sc.sc_free;
1090 	buf->f_bavail = sc.sc_free;
1091 	buf->f_files = sc.sc_dinodes + sc.sc_free;
1092 	buf->f_ffree = sc.sc_free;
1093 	buf->f_namelen = GFS2_FNAMESIZE;
1094 
1095 	return 0;
1096 }
1097 
1098 /**
1099  * gfs2_remount_fs - called when the FS is remounted
1100  * @sb:  the filesystem
1101  * @flags:  the remount flags
1102  * @data:  extra data passed in (not used right now)
1103  *
1104  * Returns: errno
1105  */
1106 
1107 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1108 {
1109 	struct gfs2_sbd *sdp = sb->s_fs_info;
1110 	struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1111 	struct gfs2_tune *gt = &sdp->sd_tune;
1112 	int error;
1113 
1114 	spin_lock(&gt->gt_spin);
1115 	args.ar_commit = gt->gt_log_flush_secs;
1116 	args.ar_quota_quantum = gt->gt_quota_quantum;
1117 	if (gt->gt_statfs_slow)
1118 		args.ar_statfs_quantum = 0;
1119 	else
1120 		args.ar_statfs_quantum = gt->gt_statfs_quantum;
1121 	spin_unlock(&gt->gt_spin);
1122 	error = gfs2_mount_args(&args, data);
1123 	if (error)
1124 		return error;
1125 
1126 	/* Not allowed to change locking details */
1127 	if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1128 	    strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1129 	    strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1130 		return -EINVAL;
1131 
1132 	/* Some flags must not be changed */
1133 	if (args_neq(&args, &sdp->sd_args, spectator) ||
1134 	    args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1135 	    args_neq(&args, &sdp->sd_args, localflocks) ||
1136 	    args_neq(&args, &sdp->sd_args, localcaching) ||
1137 	    args_neq(&args, &sdp->sd_args, meta))
1138 		return -EINVAL;
1139 
1140 	if (sdp->sd_args.ar_spectator)
1141 		*flags |= MS_RDONLY;
1142 
1143 	if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1144 		if (*flags & MS_RDONLY)
1145 			error = gfs2_make_fs_ro(sdp);
1146 		else
1147 			error = gfs2_make_fs_rw(sdp);
1148 		if (error)
1149 			return error;
1150 	}
1151 
1152 	sdp->sd_args = args;
1153 	if (sdp->sd_args.ar_posix_acl)
1154 		sb->s_flags |= MS_POSIXACL;
1155 	else
1156 		sb->s_flags &= ~MS_POSIXACL;
1157 	if (sdp->sd_args.ar_nobarrier)
1158 		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1159 	else
1160 		clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1161 	spin_lock(&gt->gt_spin);
1162 	gt->gt_log_flush_secs = args.ar_commit;
1163 	gt->gt_quota_quantum = args.ar_quota_quantum;
1164 	if (args.ar_statfs_quantum) {
1165 		gt->gt_statfs_slow = 0;
1166 		gt->gt_statfs_quantum = args.ar_statfs_quantum;
1167 	}
1168 	else {
1169 		gt->gt_statfs_slow = 1;
1170 		gt->gt_statfs_quantum = 30;
1171 	}
1172 	spin_unlock(&gt->gt_spin);
1173 
1174 	gfs2_online_uevent(sdp);
1175 	return 0;
1176 }
1177 
1178 /**
1179  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1180  * @inode: The inode to drop
1181  *
1182  * If we've received a callback on an iopen lock then its because a
1183  * remote node tried to deallocate the inode but failed due to this node
1184  * still having the inode open. Here we mark the link count zero
1185  * since we know that it must have reached zero if the GLF_DEMOTE flag
1186  * is set on the iopen glock. If we didn't do a disk read since the
1187  * remote node removed the final link then we might otherwise miss
1188  * this event. This check ensures that this node will deallocate the
1189  * inode's blocks, or alternatively pass the baton on to another
1190  * node for later deallocation.
1191  */
1192 
1193 static void gfs2_drop_inode(struct inode *inode)
1194 {
1195 	struct gfs2_inode *ip = GFS2_I(inode);
1196 
1197 	if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
1198 		struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1199 		if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1200 			clear_nlink(inode);
1201 	}
1202 	generic_drop_inode(inode);
1203 }
1204 
1205 /**
1206  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1207  * @inode: The VFS inode
1208  *
1209  */
1210 
1211 static void gfs2_clear_inode(struct inode *inode)
1212 {
1213 	struct gfs2_inode *ip = GFS2_I(inode);
1214 
1215 	/* This tells us its a "real" inode and not one which only
1216 	 * serves to contain an address space (see rgrp.c, meta_io.c)
1217 	 * which therefore doesn't have its own glocks.
1218 	 */
1219 	if (test_bit(GIF_USER, &ip->i_flags)) {
1220 		ip->i_gl->gl_object = NULL;
1221 		gfs2_glock_put(ip->i_gl);
1222 		ip->i_gl = NULL;
1223 		if (ip->i_iopen_gh.gh_gl) {
1224 			ip->i_iopen_gh.gh_gl->gl_object = NULL;
1225 			gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1226 		}
1227 	}
1228 }
1229 
1230 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1231 {
1232 	do {
1233 		if (d1 == d2)
1234 			return 1;
1235 		d1 = d1->d_parent;
1236 	} while (!IS_ROOT(d1));
1237 	return 0;
1238 }
1239 
1240 /**
1241  * gfs2_show_options - Show mount options for /proc/mounts
1242  * @s: seq_file structure
1243  * @mnt: vfsmount
1244  *
1245  * Returns: 0 on success or error code
1246  */
1247 
1248 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1249 {
1250 	struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1251 	struct gfs2_args *args = &sdp->sd_args;
1252 	int val;
1253 
1254 	if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1255 		seq_printf(s, ",meta");
1256 	if (args->ar_lockproto[0])
1257 		seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1258 	if (args->ar_locktable[0])
1259 		seq_printf(s, ",locktable=%s", args->ar_locktable);
1260 	if (args->ar_hostdata[0])
1261 		seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1262 	if (args->ar_spectator)
1263 		seq_printf(s, ",spectator");
1264 	if (args->ar_ignore_local_fs)
1265 		seq_printf(s, ",ignore_local_fs");
1266 	if (args->ar_localflocks)
1267 		seq_printf(s, ",localflocks");
1268 	if (args->ar_localcaching)
1269 		seq_printf(s, ",localcaching");
1270 	if (args->ar_debug)
1271 		seq_printf(s, ",debug");
1272 	if (args->ar_upgrade)
1273 		seq_printf(s, ",upgrade");
1274 	if (args->ar_posix_acl)
1275 		seq_printf(s, ",acl");
1276 	if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1277 		char *state;
1278 		switch (args->ar_quota) {
1279 		case GFS2_QUOTA_OFF:
1280 			state = "off";
1281 			break;
1282 		case GFS2_QUOTA_ACCOUNT:
1283 			state = "account";
1284 			break;
1285 		case GFS2_QUOTA_ON:
1286 			state = "on";
1287 			break;
1288 		default:
1289 			state = "unknown";
1290 			break;
1291 		}
1292 		seq_printf(s, ",quota=%s", state);
1293 	}
1294 	if (args->ar_suiddir)
1295 		seq_printf(s, ",suiddir");
1296 	if (args->ar_data != GFS2_DATA_DEFAULT) {
1297 		char *state;
1298 		switch (args->ar_data) {
1299 		case GFS2_DATA_WRITEBACK:
1300 			state = "writeback";
1301 			break;
1302 		case GFS2_DATA_ORDERED:
1303 			state = "ordered";
1304 			break;
1305 		default:
1306 			state = "unknown";
1307 			break;
1308 		}
1309 		seq_printf(s, ",data=%s", state);
1310 	}
1311 	if (args->ar_discard)
1312 		seq_printf(s, ",discard");
1313 	val = sdp->sd_tune.gt_log_flush_secs;
1314 	if (val != 60)
1315 		seq_printf(s, ",commit=%d", val);
1316 	val = sdp->sd_tune.gt_statfs_quantum;
1317 	if (val != 30)
1318 		seq_printf(s, ",statfs_quantum=%d", val);
1319 	val = sdp->sd_tune.gt_quota_quantum;
1320 	if (val != 60)
1321 		seq_printf(s, ",quota_quantum=%d", val);
1322 	if (args->ar_statfs_percent)
1323 		seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1324 	if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1325 		const char *state;
1326 
1327 		switch (args->ar_errors) {
1328 		case GFS2_ERRORS_WITHDRAW:
1329 			state = "withdraw";
1330 			break;
1331 		case GFS2_ERRORS_PANIC:
1332 			state = "panic";
1333 			break;
1334 		default:
1335 			state = "unknown";
1336 			break;
1337 		}
1338 		seq_printf(s, ",errors=%s", state);
1339 	}
1340 	if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1341 		seq_printf(s, ",nobarrier");
1342 
1343 	return 0;
1344 }
1345 
1346 /*
1347  * We have to (at the moment) hold the inodes main lock to cover
1348  * the gap between unlocking the shared lock on the iopen lock and
1349  * taking the exclusive lock. I'd rather do a shared -> exclusive
1350  * conversion on the iopen lock, but we can change that later. This
1351  * is safe, just less efficient.
1352  */
1353 
1354 static void gfs2_delete_inode(struct inode *inode)
1355 {
1356 	struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1357 	struct gfs2_inode *ip = GFS2_I(inode);
1358 	struct gfs2_holder gh;
1359 	int error;
1360 
1361 	if (!test_bit(GIF_USER, &ip->i_flags))
1362 		goto out;
1363 
1364 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1365 	if (unlikely(error)) {
1366 		gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1367 		goto out;
1368 	}
1369 
1370 	error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1371 	if (error)
1372 		goto out_truncate;
1373 
1374 	gfs2_glock_dq_wait(&ip->i_iopen_gh);
1375 	gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1376 	error = gfs2_glock_nq(&ip->i_iopen_gh);
1377 	if (error)
1378 		goto out_truncate;
1379 
1380 	if (S_ISDIR(inode->i_mode) &&
1381 	    (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1382 		error = gfs2_dir_exhash_dealloc(ip);
1383 		if (error)
1384 			goto out_unlock;
1385 	}
1386 
1387 	if (ip->i_eattr) {
1388 		error = gfs2_ea_dealloc(ip);
1389 		if (error)
1390 			goto out_unlock;
1391 	}
1392 
1393 	if (!gfs2_is_stuffed(ip)) {
1394 		error = gfs2_file_dealloc(ip);
1395 		if (error)
1396 			goto out_unlock;
1397 	}
1398 
1399 	error = gfs2_dinode_dealloc(ip);
1400 	if (error)
1401 		goto out_unlock;
1402 
1403 out_truncate:
1404 	error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1405 	if (error)
1406 		goto out_unlock;
1407 	/* Needs to be done before glock release & also in a transaction */
1408 	truncate_inode_pages(&inode->i_data, 0);
1409 	gfs2_trans_end(sdp);
1410 
1411 out_unlock:
1412 	if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1413 		gfs2_glock_dq(&ip->i_iopen_gh);
1414 	gfs2_holder_uninit(&ip->i_iopen_gh);
1415 	gfs2_glock_dq_uninit(&gh);
1416 	if (error && error != GLR_TRYFAILED && error != -EROFS)
1417 		fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1418 out:
1419 	truncate_inode_pages(&inode->i_data, 0);
1420 	clear_inode(inode);
1421 }
1422 
1423 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1424 {
1425 	struct gfs2_inode *ip;
1426 
1427 	ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1428 	if (ip) {
1429 		ip->i_flags = 0;
1430 		ip->i_gl = NULL;
1431 	}
1432 	return &ip->i_inode;
1433 }
1434 
1435 static void gfs2_destroy_inode(struct inode *inode)
1436 {
1437 	kmem_cache_free(gfs2_inode_cachep, inode);
1438 }
1439 
1440 const struct super_operations gfs2_super_ops = {
1441 	.alloc_inode		= gfs2_alloc_inode,
1442 	.destroy_inode		= gfs2_destroy_inode,
1443 	.write_inode		= gfs2_write_inode,
1444 	.delete_inode		= gfs2_delete_inode,
1445 	.put_super		= gfs2_put_super,
1446 	.sync_fs		= gfs2_sync_fs,
1447 	.freeze_fs 		= gfs2_freeze,
1448 	.unfreeze_fs		= gfs2_unfreeze,
1449 	.statfs			= gfs2_statfs,
1450 	.remount_fs		= gfs2_remount_fs,
1451 	.clear_inode		= gfs2_clear_inode,
1452 	.drop_inode		= gfs2_drop_inode,
1453 	.show_options		= gfs2_show_options,
1454 };
1455 
1456