xref: /openbmc/linux/fs/gfs2/super.c (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
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 
25 #include "gfs2.h"
26 #include "incore.h"
27 #include "bmap.h"
28 #include "dir.h"
29 #include "glock.h"
30 #include "glops.h"
31 #include "inode.h"
32 #include "log.h"
33 #include "meta_io.h"
34 #include "quota.h"
35 #include "recovery.h"
36 #include "rgrp.h"
37 #include "super.h"
38 #include "trans.h"
39 #include "util.h"
40 #include "sys.h"
41 #include "xattr.h"
42 
43 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
44 
45 enum {
46 	Opt_lockproto,
47 	Opt_locktable,
48 	Opt_hostdata,
49 	Opt_spectator,
50 	Opt_ignore_local_fs,
51 	Opt_localflocks,
52 	Opt_localcaching,
53 	Opt_debug,
54 	Opt_nodebug,
55 	Opt_upgrade,
56 	Opt_acl,
57 	Opt_noacl,
58 	Opt_quota_off,
59 	Opt_quota_account,
60 	Opt_quota_on,
61 	Opt_quota,
62 	Opt_noquota,
63 	Opt_suiddir,
64 	Opt_nosuiddir,
65 	Opt_data_writeback,
66 	Opt_data_ordered,
67 	Opt_meta,
68 	Opt_discard,
69 	Opt_nodiscard,
70 	Opt_commit,
71 	Opt_err_withdraw,
72 	Opt_err_panic,
73 	Opt_statfs_quantum,
74 	Opt_statfs_percent,
75 	Opt_quota_quantum,
76 	Opt_barrier,
77 	Opt_nobarrier,
78 	Opt_error,
79 };
80 
81 static const match_table_t tokens = {
82 	{Opt_lockproto, "lockproto=%s"},
83 	{Opt_locktable, "locktable=%s"},
84 	{Opt_hostdata, "hostdata=%s"},
85 	{Opt_spectator, "spectator"},
86 	{Opt_ignore_local_fs, "ignore_local_fs"},
87 	{Opt_localflocks, "localflocks"},
88 	{Opt_localcaching, "localcaching"},
89 	{Opt_debug, "debug"},
90 	{Opt_nodebug, "nodebug"},
91 	{Opt_upgrade, "upgrade"},
92 	{Opt_acl, "acl"},
93 	{Opt_noacl, "noacl"},
94 	{Opt_quota_off, "quota=off"},
95 	{Opt_quota_account, "quota=account"},
96 	{Opt_quota_on, "quota=on"},
97 	{Opt_quota, "quota"},
98 	{Opt_noquota, "noquota"},
99 	{Opt_suiddir, "suiddir"},
100 	{Opt_nosuiddir, "nosuiddir"},
101 	{Opt_data_writeback, "data=writeback"},
102 	{Opt_data_ordered, "data=ordered"},
103 	{Opt_meta, "meta"},
104 	{Opt_discard, "discard"},
105 	{Opt_nodiscard, "nodiscard"},
106 	{Opt_commit, "commit=%d"},
107 	{Opt_err_withdraw, "errors=withdraw"},
108 	{Opt_err_panic, "errors=panic"},
109 	{Opt_statfs_quantum, "statfs_quantum=%d"},
110 	{Opt_statfs_percent, "statfs_percent=%d"},
111 	{Opt_quota_quantum, "quota_quantum=%d"},
112 	{Opt_barrier, "barrier"},
113 	{Opt_nobarrier, "nobarrier"},
114 	{Opt_error, NULL}
115 };
116 
117 /**
118  * gfs2_mount_args - Parse mount options
119  * @args: The structure into which the parsed options will be written
120  * @options: The options to parse
121  *
122  * Return: errno
123  */
124 
125 int gfs2_mount_args(struct gfs2_args *args, char *options)
126 {
127 	char *o;
128 	int token;
129 	substring_t tmp[MAX_OPT_ARGS];
130 	int rv;
131 
132 	/* Split the options into tokens with the "," character and
133 	   process them */
134 
135 	while (1) {
136 		o = strsep(&options, ",");
137 		if (o == NULL)
138 			break;
139 		if (*o == '\0')
140 			continue;
141 
142 		token = match_token(o, tokens, tmp);
143 		switch (token) {
144 		case Opt_lockproto:
145 			match_strlcpy(args->ar_lockproto, &tmp[0],
146 				      GFS2_LOCKNAME_LEN);
147 			break;
148 		case Opt_locktable:
149 			match_strlcpy(args->ar_locktable, &tmp[0],
150 				      GFS2_LOCKNAME_LEN);
151 			break;
152 		case Opt_hostdata:
153 			match_strlcpy(args->ar_hostdata, &tmp[0],
154 				      GFS2_LOCKNAME_LEN);
155 			break;
156 		case Opt_spectator:
157 			args->ar_spectator = 1;
158 			break;
159 		case Opt_ignore_local_fs:
160 			args->ar_ignore_local_fs = 1;
161 			break;
162 		case Opt_localflocks:
163 			args->ar_localflocks = 1;
164 			break;
165 		case Opt_localcaching:
166 			args->ar_localcaching = 1;
167 			break;
168 		case Opt_debug:
169 			if (args->ar_errors == GFS2_ERRORS_PANIC) {
170 				printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
171 				       "are mutually exclusive.\n");
172 				return -EINVAL;
173 			}
174 			args->ar_debug = 1;
175 			break;
176 		case Opt_nodebug:
177 			args->ar_debug = 0;
178 			break;
179 		case Opt_upgrade:
180 			args->ar_upgrade = 1;
181 			break;
182 		case Opt_acl:
183 			args->ar_posix_acl = 1;
184 			break;
185 		case Opt_noacl:
186 			args->ar_posix_acl = 0;
187 			break;
188 		case Opt_quota_off:
189 		case Opt_noquota:
190 			args->ar_quota = GFS2_QUOTA_OFF;
191 			break;
192 		case Opt_quota_account:
193 			args->ar_quota = GFS2_QUOTA_ACCOUNT;
194 			break;
195 		case Opt_quota_on:
196 		case Opt_quota:
197 			args->ar_quota = GFS2_QUOTA_ON;
198 			break;
199 		case Opt_suiddir:
200 			args->ar_suiddir = 1;
201 			break;
202 		case Opt_nosuiddir:
203 			args->ar_suiddir = 0;
204 			break;
205 		case Opt_data_writeback:
206 			args->ar_data = GFS2_DATA_WRITEBACK;
207 			break;
208 		case Opt_data_ordered:
209 			args->ar_data = GFS2_DATA_ORDERED;
210 			break;
211 		case Opt_meta:
212 			args->ar_meta = 1;
213 			break;
214 		case Opt_discard:
215 			args->ar_discard = 1;
216 			break;
217 		case Opt_nodiscard:
218 			args->ar_discard = 0;
219 			break;
220 		case Opt_commit:
221 			rv = match_int(&tmp[0], &args->ar_commit);
222 			if (rv || args->ar_commit <= 0) {
223 				printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
224 				return rv ? rv : -EINVAL;
225 			}
226 			break;
227 		case Opt_statfs_quantum:
228 			rv = match_int(&tmp[0], &args->ar_statfs_quantum);
229 			if (rv || args->ar_statfs_quantum < 0) {
230 				printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
231 				return rv ? rv : -EINVAL;
232 			}
233 			break;
234 		case Opt_quota_quantum:
235 			rv = match_int(&tmp[0], &args->ar_quota_quantum);
236 			if (rv || args->ar_quota_quantum <= 0) {
237 				printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
238 				return rv ? rv : -EINVAL;
239 			}
240 			break;
241 		case Opt_statfs_percent:
242 			rv = match_int(&tmp[0], &args->ar_statfs_percent);
243 			if (rv || args->ar_statfs_percent < 0 ||
244 			    args->ar_statfs_percent > 100) {
245 				printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
246 				return rv ? rv : -EINVAL;
247 			}
248 			break;
249 		case Opt_err_withdraw:
250 			args->ar_errors = GFS2_ERRORS_WITHDRAW;
251 			break;
252 		case Opt_err_panic:
253 			if (args->ar_debug) {
254 				printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
255 					"are mutually exclusive.\n");
256 				return -EINVAL;
257 			}
258 			args->ar_errors = GFS2_ERRORS_PANIC;
259 			break;
260 		case Opt_barrier:
261 			args->ar_nobarrier = 0;
262 			break;
263 		case Opt_nobarrier:
264 			args->ar_nobarrier = 1;
265 			break;
266 		case Opt_error:
267 		default:
268 			printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
269 			return -EINVAL;
270 		}
271 	}
272 
273 	return 0;
274 }
275 
276 /**
277  * gfs2_jindex_free - Clear all the journal index information
278  * @sdp: The GFS2 superblock
279  *
280  */
281 
282 void gfs2_jindex_free(struct gfs2_sbd *sdp)
283 {
284 	struct list_head list, *head;
285 	struct gfs2_jdesc *jd;
286 	struct gfs2_journal_extent *jext;
287 
288 	spin_lock(&sdp->sd_jindex_spin);
289 	list_add(&list, &sdp->sd_jindex_list);
290 	list_del_init(&sdp->sd_jindex_list);
291 	sdp->sd_journals = 0;
292 	spin_unlock(&sdp->sd_jindex_spin);
293 
294 	while (!list_empty(&list)) {
295 		jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
296 		head = &jd->extent_list;
297 		while (!list_empty(head)) {
298 			jext = list_entry(head->next,
299 					  struct gfs2_journal_extent,
300 					  extent_list);
301 			list_del(&jext->extent_list);
302 			kfree(jext);
303 		}
304 		list_del(&jd->jd_list);
305 		iput(jd->jd_inode);
306 		kfree(jd);
307 	}
308 }
309 
310 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
311 {
312 	struct gfs2_jdesc *jd;
313 	int found = 0;
314 
315 	list_for_each_entry(jd, head, jd_list) {
316 		if (jd->jd_jid == jid) {
317 			found = 1;
318 			break;
319 		}
320 	}
321 
322 	if (!found)
323 		jd = NULL;
324 
325 	return jd;
326 }
327 
328 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
329 {
330 	struct gfs2_jdesc *jd;
331 
332 	spin_lock(&sdp->sd_jindex_spin);
333 	jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
334 	spin_unlock(&sdp->sd_jindex_spin);
335 
336 	return jd;
337 }
338 
339 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
340 {
341 	struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
342 	struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
343 	int ar;
344 	int error;
345 
346 	if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
347 	    (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
348 		gfs2_consist_inode(ip);
349 		return -EIO;
350 	}
351 	jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
352 
353 	error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
354 	if (!error && ar) {
355 		gfs2_consist_inode(ip);
356 		error = -EIO;
357 	}
358 
359 	return error;
360 }
361 
362 /**
363  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
364  * @sdp: the filesystem
365  *
366  * Returns: errno
367  */
368 
369 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
370 {
371 	struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
372 	struct gfs2_glock *j_gl = ip->i_gl;
373 	struct gfs2_holder t_gh;
374 	struct gfs2_log_header_host head;
375 	int error;
376 
377 	error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
378 	if (error)
379 		return error;
380 
381 	j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
382 
383 	error = gfs2_find_jhead(sdp->sd_jdesc, &head);
384 	if (error)
385 		goto fail;
386 
387 	if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
388 		gfs2_consist(sdp);
389 		error = -EIO;
390 		goto fail;
391 	}
392 
393 	/*  Initialize some head of the log stuff  */
394 	sdp->sd_log_sequence = head.lh_sequence + 1;
395 	gfs2_log_pointers_init(sdp, head.lh_blkno);
396 
397 	error = gfs2_quota_init(sdp);
398 	if (error)
399 		goto fail;
400 
401 	set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
402 
403 	gfs2_glock_dq_uninit(&t_gh);
404 
405 	return 0;
406 
407 fail:
408 	t_gh.gh_flags |= GL_NOCACHE;
409 	gfs2_glock_dq_uninit(&t_gh);
410 
411 	return error;
412 }
413 
414 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
415 {
416 	const struct gfs2_statfs_change *str = buf;
417 
418 	sc->sc_total = be64_to_cpu(str->sc_total);
419 	sc->sc_free = be64_to_cpu(str->sc_free);
420 	sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
421 }
422 
423 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
424 {
425 	struct gfs2_statfs_change *str = buf;
426 
427 	str->sc_total = cpu_to_be64(sc->sc_total);
428 	str->sc_free = cpu_to_be64(sc->sc_free);
429 	str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
430 }
431 
432 int gfs2_statfs_init(struct gfs2_sbd *sdp)
433 {
434 	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
435 	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
436 	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
437 	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
438 	struct buffer_head *m_bh, *l_bh;
439 	struct gfs2_holder gh;
440 	int error;
441 
442 	error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
443 				   &gh);
444 	if (error)
445 		return error;
446 
447 	error = gfs2_meta_inode_buffer(m_ip, &m_bh);
448 	if (error)
449 		goto out;
450 
451 	if (sdp->sd_args.ar_spectator) {
452 		spin_lock(&sdp->sd_statfs_spin);
453 		gfs2_statfs_change_in(m_sc, m_bh->b_data +
454 				      sizeof(struct gfs2_dinode));
455 		spin_unlock(&sdp->sd_statfs_spin);
456 	} else {
457 		error = gfs2_meta_inode_buffer(l_ip, &l_bh);
458 		if (error)
459 			goto out_m_bh;
460 
461 		spin_lock(&sdp->sd_statfs_spin);
462 		gfs2_statfs_change_in(m_sc, m_bh->b_data +
463 				      sizeof(struct gfs2_dinode));
464 		gfs2_statfs_change_in(l_sc, l_bh->b_data +
465 				      sizeof(struct gfs2_dinode));
466 		spin_unlock(&sdp->sd_statfs_spin);
467 
468 		brelse(l_bh);
469 	}
470 
471 out_m_bh:
472 	brelse(m_bh);
473 out:
474 	gfs2_glock_dq_uninit(&gh);
475 	return 0;
476 }
477 
478 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
479 			s64 dinodes)
480 {
481 	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
482 	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
483 	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
484 	struct buffer_head *l_bh;
485 	s64 x, y;
486 	int need_sync = 0;
487 	int error;
488 
489 	error = gfs2_meta_inode_buffer(l_ip, &l_bh);
490 	if (error)
491 		return;
492 
493 	gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
494 
495 	spin_lock(&sdp->sd_statfs_spin);
496 	l_sc->sc_total += total;
497 	l_sc->sc_free += free;
498 	l_sc->sc_dinodes += dinodes;
499 	gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
500 	if (sdp->sd_args.ar_statfs_percent) {
501 		x = 100 * l_sc->sc_free;
502 		y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
503 		if (x >= y || x <= -y)
504 			need_sync = 1;
505 	}
506 	spin_unlock(&sdp->sd_statfs_spin);
507 
508 	brelse(l_bh);
509 	if (need_sync)
510 		gfs2_wake_up_statfs(sdp);
511 }
512 
513 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
514 		   struct buffer_head *l_bh)
515 {
516 	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
517 	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
518 	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
519 	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
520 
521 	gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
522 
523 	spin_lock(&sdp->sd_statfs_spin);
524 	m_sc->sc_total += l_sc->sc_total;
525 	m_sc->sc_free += l_sc->sc_free;
526 	m_sc->sc_dinodes += l_sc->sc_dinodes;
527 	memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
528 	memset(l_bh->b_data + sizeof(struct gfs2_dinode),
529 	       0, sizeof(struct gfs2_statfs_change));
530 	spin_unlock(&sdp->sd_statfs_spin);
531 
532 	gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
533 	gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
534 }
535 
536 int gfs2_statfs_sync(struct super_block *sb, int type)
537 {
538 	struct gfs2_sbd *sdp = sb->s_fs_info;
539 	struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
540 	struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
541 	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
542 	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
543 	struct gfs2_holder gh;
544 	struct buffer_head *m_bh, *l_bh;
545 	int error;
546 
547 	error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
548 				   &gh);
549 	if (error)
550 		return error;
551 
552 	error = gfs2_meta_inode_buffer(m_ip, &m_bh);
553 	if (error)
554 		goto out;
555 
556 	spin_lock(&sdp->sd_statfs_spin);
557 	gfs2_statfs_change_in(m_sc, m_bh->b_data +
558 			      sizeof(struct gfs2_dinode));
559 	if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
560 		spin_unlock(&sdp->sd_statfs_spin);
561 		goto out_bh;
562 	}
563 	spin_unlock(&sdp->sd_statfs_spin);
564 
565 	error = gfs2_meta_inode_buffer(l_ip, &l_bh);
566 	if (error)
567 		goto out_bh;
568 
569 	error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
570 	if (error)
571 		goto out_bh2;
572 
573 	update_statfs(sdp, m_bh, l_bh);
574 	sdp->sd_statfs_force_sync = 0;
575 
576 	gfs2_trans_end(sdp);
577 
578 out_bh2:
579 	brelse(l_bh);
580 out_bh:
581 	brelse(m_bh);
582 out:
583 	gfs2_glock_dq_uninit(&gh);
584 	return error;
585 }
586 
587 struct lfcc {
588 	struct list_head list;
589 	struct gfs2_holder gh;
590 };
591 
592 /**
593  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
594  *                            journals are clean
595  * @sdp: the file system
596  * @state: the state to put the transaction lock into
597  * @t_gh: the hold on the transaction lock
598  *
599  * Returns: errno
600  */
601 
602 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
603 				    struct gfs2_holder *t_gh)
604 {
605 	struct gfs2_inode *ip;
606 	struct gfs2_jdesc *jd;
607 	struct lfcc *lfcc;
608 	LIST_HEAD(list);
609 	struct gfs2_log_header_host lh;
610 	int error;
611 
612 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
613 		lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
614 		if (!lfcc) {
615 			error = -ENOMEM;
616 			goto out;
617 		}
618 		ip = GFS2_I(jd->jd_inode);
619 		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
620 		if (error) {
621 			kfree(lfcc);
622 			goto out;
623 		}
624 		list_add(&lfcc->list, &list);
625 	}
626 
627 	error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
628 				   GL_NOCACHE, t_gh);
629 
630 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
631 		error = gfs2_jdesc_check(jd);
632 		if (error)
633 			break;
634 		error = gfs2_find_jhead(jd, &lh);
635 		if (error)
636 			break;
637 		if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
638 			error = -EBUSY;
639 			break;
640 		}
641 	}
642 
643 	if (error)
644 		gfs2_glock_dq_uninit(t_gh);
645 
646 out:
647 	while (!list_empty(&list)) {
648 		lfcc = list_entry(list.next, struct lfcc, list);
649 		list_del(&lfcc->list);
650 		gfs2_glock_dq_uninit(&lfcc->gh);
651 		kfree(lfcc);
652 	}
653 	return error;
654 }
655 
656 /**
657  * gfs2_freeze_fs - freezes the file system
658  * @sdp: the file system
659  *
660  * This function flushes data and meta data for all machines by
661  * aquiring the transaction log exclusively.  All journals are
662  * ensured to be in a clean state as well.
663  *
664  * Returns: errno
665  */
666 
667 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
668 {
669 	int error = 0;
670 
671 	mutex_lock(&sdp->sd_freeze_lock);
672 
673 	if (!sdp->sd_freeze_count++) {
674 		error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
675 		if (error)
676 			sdp->sd_freeze_count--;
677 	}
678 
679 	mutex_unlock(&sdp->sd_freeze_lock);
680 
681 	return error;
682 }
683 
684 /**
685  * gfs2_unfreeze_fs - unfreezes the file system
686  * @sdp: the file system
687  *
688  * This function allows the file system to proceed by unlocking
689  * the exclusively held transaction lock.  Other GFS2 nodes are
690  * now free to acquire the lock shared and go on with their lives.
691  *
692  */
693 
694 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
695 {
696 	mutex_lock(&sdp->sd_freeze_lock);
697 
698 	if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
699 		gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
700 
701 	mutex_unlock(&sdp->sd_freeze_lock);
702 }
703 
704 
705 /**
706  * gfs2_write_inode - Make sure the inode is stable on the disk
707  * @inode: The inode
708  * @sync: synchronous write flag
709  *
710  * Returns: errno
711  */
712 
713 static int gfs2_write_inode(struct inode *inode, int sync)
714 {
715 	struct gfs2_inode *ip = GFS2_I(inode);
716 	struct gfs2_sbd *sdp = GFS2_SB(inode);
717 	struct gfs2_holder gh;
718 	struct buffer_head *bh;
719 	struct timespec atime;
720 	struct gfs2_dinode *di;
721 	int ret = 0;
722 
723 	/* Check this is a "normal" inode, etc */
724 	if (!test_bit(GIF_USER, &ip->i_flags) ||
725 	    (current->flags & PF_MEMALLOC))
726 		return 0;
727 	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
728 	if (ret)
729 		goto do_flush;
730 	ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
731 	if (ret)
732 		goto do_unlock;
733 	ret = gfs2_meta_inode_buffer(ip, &bh);
734 	if (ret == 0) {
735 		di = (struct gfs2_dinode *)bh->b_data;
736 		atime.tv_sec = be64_to_cpu(di->di_atime);
737 		atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
738 		if (timespec_compare(&inode->i_atime, &atime) > 0) {
739 			gfs2_trans_add_bh(ip->i_gl, bh, 1);
740 			gfs2_dinode_out(ip, bh->b_data);
741 		}
742 		brelse(bh);
743 	}
744 	gfs2_trans_end(sdp);
745 do_unlock:
746 	gfs2_glock_dq_uninit(&gh);
747 do_flush:
748 	if (sync != 0)
749 		gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
750 	return ret;
751 }
752 
753 /**
754  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
755  * @sdp: the filesystem
756  *
757  * Returns: errno
758  */
759 
760 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
761 {
762 	struct gfs2_holder t_gh;
763 	int error;
764 
765 	flush_workqueue(gfs2_delete_workqueue);
766 	gfs2_quota_sync(sdp->sd_vfs, 0);
767 	gfs2_statfs_sync(sdp->sd_vfs, 0);
768 
769 	error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
770 				   &t_gh);
771 	if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
772 		return error;
773 
774 	gfs2_meta_syncfs(sdp);
775 	gfs2_log_shutdown(sdp);
776 
777 	clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
778 
779 	if (t_gh.gh_gl)
780 		gfs2_glock_dq_uninit(&t_gh);
781 
782 	gfs2_quota_cleanup(sdp);
783 
784 	return error;
785 }
786 
787 static int gfs2_umount_recovery_wait(void *word)
788 {
789 	schedule();
790 	return 0;
791 }
792 
793 /**
794  * gfs2_put_super - Unmount the filesystem
795  * @sb: The VFS superblock
796  *
797  */
798 
799 static void gfs2_put_super(struct super_block *sb)
800 {
801 	struct gfs2_sbd *sdp = sb->s_fs_info;
802 	int error;
803 	struct gfs2_jdesc *jd;
804 
805 	/*  Unfreeze the filesystem, if we need to  */
806 
807 	mutex_lock(&sdp->sd_freeze_lock);
808 	if (sdp->sd_freeze_count)
809 		gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
810 	mutex_unlock(&sdp->sd_freeze_lock);
811 
812 	/* No more recovery requests */
813 	set_bit(SDF_NORECOVERY, &sdp->sd_flags);
814 	smp_mb();
815 
816 	/* Wait on outstanding recovery */
817 restart:
818 	spin_lock(&sdp->sd_jindex_spin);
819 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
820 		if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
821 			continue;
822 		spin_unlock(&sdp->sd_jindex_spin);
823 		wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
824 			    gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
825 		goto restart;
826 	}
827 	spin_unlock(&sdp->sd_jindex_spin);
828 
829 	kthread_stop(sdp->sd_quotad_process);
830 	kthread_stop(sdp->sd_logd_process);
831 
832 	if (!(sb->s_flags & MS_RDONLY)) {
833 		error = gfs2_make_fs_ro(sdp);
834 		if (error)
835 			gfs2_io_error(sdp);
836 	}
837 	/*  At this point, we're through modifying the disk  */
838 
839 	/*  Release stuff  */
840 
841 	iput(sdp->sd_jindex);
842 	iput(sdp->sd_statfs_inode);
843 	iput(sdp->sd_rindex);
844 	iput(sdp->sd_quota_inode);
845 
846 	gfs2_glock_put(sdp->sd_rename_gl);
847 	gfs2_glock_put(sdp->sd_trans_gl);
848 
849 	if (!sdp->sd_args.ar_spectator) {
850 		gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
851 		gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
852 		gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
853 		gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
854 		iput(sdp->sd_sc_inode);
855 		iput(sdp->sd_qc_inode);
856 	}
857 
858 	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
859 	gfs2_clear_rgrpd(sdp);
860 	gfs2_jindex_free(sdp);
861 	/*  Take apart glock structures and buffer lists  */
862 	gfs2_gl_hash_clear(sdp);
863 	/*  Unmount the locking protocol  */
864 	gfs2_lm_unmount(sdp);
865 
866 	/*  At this point, we're through participating in the lockspace  */
867 	gfs2_sys_fs_del(sdp);
868 }
869 
870 /**
871  * gfs2_sync_fs - sync the filesystem
872  * @sb: the superblock
873  *
874  * Flushes the log to disk.
875  */
876 
877 static int gfs2_sync_fs(struct super_block *sb, int wait)
878 {
879 	if (wait && sb->s_fs_info)
880 		gfs2_log_flush(sb->s_fs_info, NULL);
881 	return 0;
882 }
883 
884 /**
885  * gfs2_freeze - prevent further writes to the filesystem
886  * @sb: the VFS structure for the filesystem
887  *
888  */
889 
890 static int gfs2_freeze(struct super_block *sb)
891 {
892 	struct gfs2_sbd *sdp = sb->s_fs_info;
893 	int error;
894 
895 	if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
896 		return -EINVAL;
897 
898 	for (;;) {
899 		error = gfs2_freeze_fs(sdp);
900 		if (!error)
901 			break;
902 
903 		switch (error) {
904 		case -EBUSY:
905 			fs_err(sdp, "waiting for recovery before freeze\n");
906 			break;
907 
908 		default:
909 			fs_err(sdp, "error freezing FS: %d\n", error);
910 			break;
911 		}
912 
913 		fs_err(sdp, "retrying...\n");
914 		msleep(1000);
915 	}
916 	return 0;
917 }
918 
919 /**
920  * gfs2_unfreeze - reallow writes to the filesystem
921  * @sb: the VFS structure for the filesystem
922  *
923  */
924 
925 static int gfs2_unfreeze(struct super_block *sb)
926 {
927 	gfs2_unfreeze_fs(sb->s_fs_info);
928 	return 0;
929 }
930 
931 /**
932  * statfs_fill - fill in the sg for a given RG
933  * @rgd: the RG
934  * @sc: the sc structure
935  *
936  * Returns: 0 on success, -ESTALE if the LVB is invalid
937  */
938 
939 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
940 			    struct gfs2_statfs_change_host *sc)
941 {
942 	gfs2_rgrp_verify(rgd);
943 	sc->sc_total += rgd->rd_data;
944 	sc->sc_free += rgd->rd_free;
945 	sc->sc_dinodes += rgd->rd_dinodes;
946 	return 0;
947 }
948 
949 /**
950  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
951  * @sdp: the filesystem
952  * @sc: the sc info that will be returned
953  *
954  * Any error (other than a signal) will cause this routine to fall back
955  * to the synchronous version.
956  *
957  * FIXME: This really shouldn't busy wait like this.
958  *
959  * Returns: errno
960  */
961 
962 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
963 {
964 	struct gfs2_holder ri_gh;
965 	struct gfs2_rgrpd *rgd_next;
966 	struct gfs2_holder *gha, *gh;
967 	unsigned int slots = 64;
968 	unsigned int x;
969 	int done;
970 	int error = 0, err;
971 
972 	memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
973 	gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
974 	if (!gha)
975 		return -ENOMEM;
976 
977 	error = gfs2_rindex_hold(sdp, &ri_gh);
978 	if (error)
979 		goto out;
980 
981 	rgd_next = gfs2_rgrpd_get_first(sdp);
982 
983 	for (;;) {
984 		done = 1;
985 
986 		for (x = 0; x < slots; x++) {
987 			gh = gha + x;
988 
989 			if (gh->gh_gl && gfs2_glock_poll(gh)) {
990 				err = gfs2_glock_wait(gh);
991 				if (err) {
992 					gfs2_holder_uninit(gh);
993 					error = err;
994 				} else {
995 					if (!error)
996 						error = statfs_slow_fill(
997 							gh->gh_gl->gl_object, sc);
998 					gfs2_glock_dq_uninit(gh);
999 				}
1000 			}
1001 
1002 			if (gh->gh_gl)
1003 				done = 0;
1004 			else if (rgd_next && !error) {
1005 				error = gfs2_glock_nq_init(rgd_next->rd_gl,
1006 							   LM_ST_SHARED,
1007 							   GL_ASYNC,
1008 							   gh);
1009 				rgd_next = gfs2_rgrpd_get_next(rgd_next);
1010 				done = 0;
1011 			}
1012 
1013 			if (signal_pending(current))
1014 				error = -ERESTARTSYS;
1015 		}
1016 
1017 		if (done)
1018 			break;
1019 
1020 		yield();
1021 	}
1022 
1023 	gfs2_glock_dq_uninit(&ri_gh);
1024 
1025 out:
1026 	kfree(gha);
1027 	return error;
1028 }
1029 
1030 /**
1031  * gfs2_statfs_i - Do a statfs
1032  * @sdp: the filesystem
1033  * @sg: the sg structure
1034  *
1035  * Returns: errno
1036  */
1037 
1038 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1039 {
1040 	struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1041 	struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1042 
1043 	spin_lock(&sdp->sd_statfs_spin);
1044 
1045 	*sc = *m_sc;
1046 	sc->sc_total += l_sc->sc_total;
1047 	sc->sc_free += l_sc->sc_free;
1048 	sc->sc_dinodes += l_sc->sc_dinodes;
1049 
1050 	spin_unlock(&sdp->sd_statfs_spin);
1051 
1052 	if (sc->sc_free < 0)
1053 		sc->sc_free = 0;
1054 	if (sc->sc_free > sc->sc_total)
1055 		sc->sc_free = sc->sc_total;
1056 	if (sc->sc_dinodes < 0)
1057 		sc->sc_dinodes = 0;
1058 
1059 	return 0;
1060 }
1061 
1062 /**
1063  * gfs2_statfs - Gather and return stats about the filesystem
1064  * @sb: The superblock
1065  * @statfsbuf: The buffer
1066  *
1067  * Returns: 0 on success or error code
1068  */
1069 
1070 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1071 {
1072 	struct super_block *sb = dentry->d_inode->i_sb;
1073 	struct gfs2_sbd *sdp = sb->s_fs_info;
1074 	struct gfs2_statfs_change_host sc;
1075 	int error;
1076 
1077 	if (gfs2_tune_get(sdp, gt_statfs_slow))
1078 		error = gfs2_statfs_slow(sdp, &sc);
1079 	else
1080 		error = gfs2_statfs_i(sdp, &sc);
1081 
1082 	if (error)
1083 		return error;
1084 
1085 	buf->f_type = GFS2_MAGIC;
1086 	buf->f_bsize = sdp->sd_sb.sb_bsize;
1087 	buf->f_blocks = sc.sc_total;
1088 	buf->f_bfree = sc.sc_free;
1089 	buf->f_bavail = sc.sc_free;
1090 	buf->f_files = sc.sc_dinodes + sc.sc_free;
1091 	buf->f_ffree = sc.sc_free;
1092 	buf->f_namelen = GFS2_FNAMESIZE;
1093 
1094 	return 0;
1095 }
1096 
1097 /**
1098  * gfs2_remount_fs - called when the FS is remounted
1099  * @sb:  the filesystem
1100  * @flags:  the remount flags
1101  * @data:  extra data passed in (not used right now)
1102  *
1103  * Returns: errno
1104  */
1105 
1106 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1107 {
1108 	struct gfs2_sbd *sdp = sb->s_fs_info;
1109 	struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1110 	struct gfs2_tune *gt = &sdp->sd_tune;
1111 	int error;
1112 
1113 	spin_lock(&gt->gt_spin);
1114 	args.ar_commit = gt->gt_log_flush_secs;
1115 	args.ar_quota_quantum = gt->gt_quota_quantum;
1116 	if (gt->gt_statfs_slow)
1117 		args.ar_statfs_quantum = 0;
1118 	else
1119 		args.ar_statfs_quantum = gt->gt_statfs_quantum;
1120 	spin_unlock(&gt->gt_spin);
1121 	error = gfs2_mount_args(&args, data);
1122 	if (error)
1123 		return error;
1124 
1125 	/* Not allowed to change locking details */
1126 	if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1127 	    strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1128 	    strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1129 		return -EINVAL;
1130 
1131 	/* Some flags must not be changed */
1132 	if (args_neq(&args, &sdp->sd_args, spectator) ||
1133 	    args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1134 	    args_neq(&args, &sdp->sd_args, localflocks) ||
1135 	    args_neq(&args, &sdp->sd_args, localcaching) ||
1136 	    args_neq(&args, &sdp->sd_args, meta))
1137 		return -EINVAL;
1138 
1139 	if (sdp->sd_args.ar_spectator)
1140 		*flags |= MS_RDONLY;
1141 
1142 	if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1143 		if (*flags & MS_RDONLY)
1144 			error = gfs2_make_fs_ro(sdp);
1145 		else
1146 			error = gfs2_make_fs_rw(sdp);
1147 		if (error)
1148 			return error;
1149 	}
1150 
1151 	sdp->sd_args = args;
1152 	if (sdp->sd_args.ar_posix_acl)
1153 		sb->s_flags |= MS_POSIXACL;
1154 	else
1155 		sb->s_flags &= ~MS_POSIXACL;
1156 	if (sdp->sd_args.ar_nobarrier)
1157 		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1158 	else
1159 		clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1160 	spin_lock(&gt->gt_spin);
1161 	gt->gt_log_flush_secs = args.ar_commit;
1162 	gt->gt_quota_quantum = args.ar_quota_quantum;
1163 	if (args.ar_statfs_quantum) {
1164 		gt->gt_statfs_slow = 0;
1165 		gt->gt_statfs_quantum = args.ar_statfs_quantum;
1166 	}
1167 	else {
1168 		gt->gt_statfs_slow = 1;
1169 		gt->gt_statfs_quantum = 30;
1170 	}
1171 	spin_unlock(&gt->gt_spin);
1172 
1173 	gfs2_online_uevent(sdp);
1174 	return 0;
1175 }
1176 
1177 /**
1178  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1179  * @inode: The inode to drop
1180  *
1181  * If we've received a callback on an iopen lock then its because a
1182  * remote node tried to deallocate the inode but failed due to this node
1183  * still having the inode open. Here we mark the link count zero
1184  * since we know that it must have reached zero if the GLF_DEMOTE flag
1185  * is set on the iopen glock. If we didn't do a disk read since the
1186  * remote node removed the final link then we might otherwise miss
1187  * this event. This check ensures that this node will deallocate the
1188  * inode's blocks, or alternatively pass the baton on to another
1189  * node for later deallocation.
1190  */
1191 
1192 static void gfs2_drop_inode(struct inode *inode)
1193 {
1194 	struct gfs2_inode *ip = GFS2_I(inode);
1195 
1196 	if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
1197 		struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1198 		if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1199 			clear_nlink(inode);
1200 	}
1201 	generic_drop_inode(inode);
1202 }
1203 
1204 /**
1205  * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1206  * @inode: The VFS inode
1207  *
1208  */
1209 
1210 static void gfs2_clear_inode(struct inode *inode)
1211 {
1212 	struct gfs2_inode *ip = GFS2_I(inode);
1213 
1214 	/* This tells us its a "real" inode and not one which only
1215 	 * serves to contain an address space (see rgrp.c, meta_io.c)
1216 	 * which therefore doesn't have its own glocks.
1217 	 */
1218 	if (test_bit(GIF_USER, &ip->i_flags)) {
1219 		ip->i_gl->gl_object = NULL;
1220 		gfs2_glock_put(ip->i_gl);
1221 		ip->i_gl = NULL;
1222 		if (ip->i_iopen_gh.gh_gl) {
1223 			ip->i_iopen_gh.gh_gl->gl_object = NULL;
1224 			gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1225 		}
1226 	}
1227 }
1228 
1229 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1230 {
1231 	do {
1232 		if (d1 == d2)
1233 			return 1;
1234 		d1 = d1->d_parent;
1235 	} while (!IS_ROOT(d1));
1236 	return 0;
1237 }
1238 
1239 /**
1240  * gfs2_show_options - Show mount options for /proc/mounts
1241  * @s: seq_file structure
1242  * @mnt: vfsmount
1243  *
1244  * Returns: 0 on success or error code
1245  */
1246 
1247 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1248 {
1249 	struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1250 	struct gfs2_args *args = &sdp->sd_args;
1251 	int val;
1252 
1253 	if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1254 		seq_printf(s, ",meta");
1255 	if (args->ar_lockproto[0])
1256 		seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1257 	if (args->ar_locktable[0])
1258 		seq_printf(s, ",locktable=%s", args->ar_locktable);
1259 	if (args->ar_hostdata[0])
1260 		seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1261 	if (args->ar_spectator)
1262 		seq_printf(s, ",spectator");
1263 	if (args->ar_ignore_local_fs)
1264 		seq_printf(s, ",ignore_local_fs");
1265 	if (args->ar_localflocks)
1266 		seq_printf(s, ",localflocks");
1267 	if (args->ar_localcaching)
1268 		seq_printf(s, ",localcaching");
1269 	if (args->ar_debug)
1270 		seq_printf(s, ",debug");
1271 	if (args->ar_upgrade)
1272 		seq_printf(s, ",upgrade");
1273 	if (args->ar_posix_acl)
1274 		seq_printf(s, ",acl");
1275 	if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1276 		char *state;
1277 		switch (args->ar_quota) {
1278 		case GFS2_QUOTA_OFF:
1279 			state = "off";
1280 			break;
1281 		case GFS2_QUOTA_ACCOUNT:
1282 			state = "account";
1283 			break;
1284 		case GFS2_QUOTA_ON:
1285 			state = "on";
1286 			break;
1287 		default:
1288 			state = "unknown";
1289 			break;
1290 		}
1291 		seq_printf(s, ",quota=%s", state);
1292 	}
1293 	if (args->ar_suiddir)
1294 		seq_printf(s, ",suiddir");
1295 	if (args->ar_data != GFS2_DATA_DEFAULT) {
1296 		char *state;
1297 		switch (args->ar_data) {
1298 		case GFS2_DATA_WRITEBACK:
1299 			state = "writeback";
1300 			break;
1301 		case GFS2_DATA_ORDERED:
1302 			state = "ordered";
1303 			break;
1304 		default:
1305 			state = "unknown";
1306 			break;
1307 		}
1308 		seq_printf(s, ",data=%s", state);
1309 	}
1310 	if (args->ar_discard)
1311 		seq_printf(s, ",discard");
1312 	val = sdp->sd_tune.gt_log_flush_secs;
1313 	if (val != 60)
1314 		seq_printf(s, ",commit=%d", val);
1315 	val = sdp->sd_tune.gt_statfs_quantum;
1316 	if (val != 30)
1317 		seq_printf(s, ",statfs_quantum=%d", val);
1318 	val = sdp->sd_tune.gt_quota_quantum;
1319 	if (val != 60)
1320 		seq_printf(s, ",quota_quantum=%d", val);
1321 	if (args->ar_statfs_percent)
1322 		seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1323 	if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1324 		const char *state;
1325 
1326 		switch (args->ar_errors) {
1327 		case GFS2_ERRORS_WITHDRAW:
1328 			state = "withdraw";
1329 			break;
1330 		case GFS2_ERRORS_PANIC:
1331 			state = "panic";
1332 			break;
1333 		default:
1334 			state = "unknown";
1335 			break;
1336 		}
1337 		seq_printf(s, ",errors=%s", state);
1338 	}
1339 	if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1340 		seq_printf(s, ",nobarrier");
1341 
1342 	return 0;
1343 }
1344 
1345 /*
1346  * We have to (at the moment) hold the inodes main lock to cover
1347  * the gap between unlocking the shared lock on the iopen lock and
1348  * taking the exclusive lock. I'd rather do a shared -> exclusive
1349  * conversion on the iopen lock, but we can change that later. This
1350  * is safe, just less efficient.
1351  */
1352 
1353 static void gfs2_delete_inode(struct inode *inode)
1354 {
1355 	struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1356 	struct gfs2_inode *ip = GFS2_I(inode);
1357 	struct gfs2_holder gh;
1358 	int error;
1359 
1360 	if (!test_bit(GIF_USER, &ip->i_flags))
1361 		goto out;
1362 
1363 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1364 	if (unlikely(error)) {
1365 		gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1366 		goto out;
1367 	}
1368 
1369 	error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1370 	if (error)
1371 		goto out_truncate;
1372 
1373 	gfs2_glock_dq_wait(&ip->i_iopen_gh);
1374 	gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1375 	error = gfs2_glock_nq(&ip->i_iopen_gh);
1376 	if (error)
1377 		goto out_truncate;
1378 
1379 	if (S_ISDIR(inode->i_mode) &&
1380 	    (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1381 		error = gfs2_dir_exhash_dealloc(ip);
1382 		if (error)
1383 			goto out_unlock;
1384 	}
1385 
1386 	if (ip->i_eattr) {
1387 		error = gfs2_ea_dealloc(ip);
1388 		if (error)
1389 			goto out_unlock;
1390 	}
1391 
1392 	if (!gfs2_is_stuffed(ip)) {
1393 		error = gfs2_file_dealloc(ip);
1394 		if (error)
1395 			goto out_unlock;
1396 	}
1397 
1398 	error = gfs2_dinode_dealloc(ip);
1399 	if (error)
1400 		goto out_unlock;
1401 
1402 out_truncate:
1403 	error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1404 	if (error)
1405 		goto out_unlock;
1406 	/* Needs to be done before glock release & also in a transaction */
1407 	truncate_inode_pages(&inode->i_data, 0);
1408 	gfs2_trans_end(sdp);
1409 
1410 out_unlock:
1411 	if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1412 		gfs2_glock_dq(&ip->i_iopen_gh);
1413 	gfs2_holder_uninit(&ip->i_iopen_gh);
1414 	gfs2_glock_dq_uninit(&gh);
1415 	if (error && error != GLR_TRYFAILED && error != -EROFS)
1416 		fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1417 out:
1418 	truncate_inode_pages(&inode->i_data, 0);
1419 	clear_inode(inode);
1420 }
1421 
1422 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1423 {
1424 	struct gfs2_inode *ip;
1425 
1426 	ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1427 	if (ip) {
1428 		ip->i_flags = 0;
1429 		ip->i_gl = NULL;
1430 	}
1431 	return &ip->i_inode;
1432 }
1433 
1434 static void gfs2_destroy_inode(struct inode *inode)
1435 {
1436 	kmem_cache_free(gfs2_inode_cachep, inode);
1437 }
1438 
1439 const struct super_operations gfs2_super_ops = {
1440 	.alloc_inode		= gfs2_alloc_inode,
1441 	.destroy_inode		= gfs2_destroy_inode,
1442 	.write_inode		= gfs2_write_inode,
1443 	.delete_inode		= gfs2_delete_inode,
1444 	.put_super		= gfs2_put_super,
1445 	.sync_fs		= gfs2_sync_fs,
1446 	.freeze_fs 		= gfs2_freeze,
1447 	.unfreeze_fs		= gfs2_unfreeze,
1448 	.statfs			= gfs2_statfs,
1449 	.remount_fs		= gfs2_remount_fs,
1450 	.clear_inode		= gfs2_clear_inode,
1451 	.drop_inode		= gfs2_drop_inode,
1452 	.show_options		= gfs2_show_options,
1453 };
1454 
1455