blob: b62c8427672cb92444e245da167dc750b04e58d6 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Bob Petersonda6dd402007-12-11 18:49:21 -06003 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +010010#include <linux/bio.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000011#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>
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +010016#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>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050021#include <linux/gfs2_ondisk.h>
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +010022#include <linux/crc32.h>
23#include <linux/time.h>
Steven Whitehousee4027462010-01-25 11:20:19 +000024#include <linux/wait.h>
Christoph Hellwiga9185b42010-03-05 09:21:37 +010025#include <linux/writeback.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000026
27#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050028#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000029#include "bmap.h"
30#include "dir.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000031#include "glock.h"
32#include "glops.h"
33#include "inode.h"
34#include "log.h"
35#include "meta_io.h"
36#include "quota.h"
37#include "recovery.h"
38#include "rgrp.h"
39#include "super.h"
40#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050041#include "util.h"
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +010042#include "sys.h"
Steven Whitehouse307cf6e2009-08-26 18:51:04 +010043#include "xattr.h"
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +010044
45#define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
46
47enum {
48 Opt_lockproto,
49 Opt_locktable,
50 Opt_hostdata,
51 Opt_spectator,
52 Opt_ignore_local_fs,
53 Opt_localflocks,
54 Opt_localcaching,
55 Opt_debug,
56 Opt_nodebug,
57 Opt_upgrade,
58 Opt_acl,
59 Opt_noacl,
60 Opt_quota_off,
61 Opt_quota_account,
62 Opt_quota_on,
63 Opt_quota,
64 Opt_noquota,
65 Opt_suiddir,
66 Opt_nosuiddir,
67 Opt_data_writeback,
68 Opt_data_ordered,
69 Opt_meta,
70 Opt_discard,
71 Opt_nodiscard,
72 Opt_commit,
Bob Petersond34843d2009-08-24 10:44:18 +010073 Opt_err_withdraw,
74 Opt_err_panic,
Benjamin Marzinski3d3c10f2009-10-20 02:39:44 -050075 Opt_statfs_quantum,
76 Opt_statfs_percent,
77 Opt_quota_quantum,
Christoph Hellwigf25934c2009-10-30 08:03:27 +010078 Opt_barrier,
79 Opt_nobarrier,
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +010080 Opt_error,
81};
82
83static const match_table_t tokens = {
84 {Opt_lockproto, "lockproto=%s"},
85 {Opt_locktable, "locktable=%s"},
86 {Opt_hostdata, "hostdata=%s"},
87 {Opt_spectator, "spectator"},
Steven Whitehouse43f74c12010-09-29 14:24:41 +010088 {Opt_spectator, "norecovery"},
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +010089 {Opt_ignore_local_fs, "ignore_local_fs"},
90 {Opt_localflocks, "localflocks"},
91 {Opt_localcaching, "localcaching"},
92 {Opt_debug, "debug"},
93 {Opt_nodebug, "nodebug"},
94 {Opt_upgrade, "upgrade"},
95 {Opt_acl, "acl"},
96 {Opt_noacl, "noacl"},
97 {Opt_quota_off, "quota=off"},
98 {Opt_quota_account, "quota=account"},
99 {Opt_quota_on, "quota=on"},
100 {Opt_quota, "quota"},
101 {Opt_noquota, "noquota"},
102 {Opt_suiddir, "suiddir"},
103 {Opt_nosuiddir, "nosuiddir"},
104 {Opt_data_writeback, "data=writeback"},
105 {Opt_data_ordered, "data=ordered"},
106 {Opt_meta, "meta"},
107 {Opt_discard, "discard"},
108 {Opt_nodiscard, "nodiscard"},
109 {Opt_commit, "commit=%d"},
Bob Petersond34843d2009-08-24 10:44:18 +0100110 {Opt_err_withdraw, "errors=withdraw"},
111 {Opt_err_panic, "errors=panic"},
Benjamin Marzinski3d3c10f2009-10-20 02:39:44 -0500112 {Opt_statfs_quantum, "statfs_quantum=%d"},
113 {Opt_statfs_percent, "statfs_percent=%d"},
114 {Opt_quota_quantum, "quota_quantum=%d"},
Christoph Hellwigf25934c2009-10-30 08:03:27 +0100115 {Opt_barrier, "barrier"},
116 {Opt_nobarrier, "nobarrier"},
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100117 {Opt_error, NULL}
118};
119
120/**
121 * gfs2_mount_args - Parse mount options
Steven Whitehousef55073f2009-09-28 10:30:49 +0100122 * @args: The structure into which the parsed options will be written
123 * @options: The options to parse
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100124 *
125 * Return: errno
126 */
127
Steven Whitehousef55073f2009-09-28 10:30:49 +0100128int gfs2_mount_args(struct gfs2_args *args, char *options)
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100129{
130 char *o;
131 int token;
132 substring_t tmp[MAX_OPT_ARGS];
133 int rv;
134
135 /* Split the options into tokens with the "," character and
136 process them */
137
138 while (1) {
139 o = strsep(&options, ",");
140 if (o == NULL)
141 break;
142 if (*o == '\0')
143 continue;
144
145 token = match_token(o, tokens, tmp);
146 switch (token) {
147 case Opt_lockproto:
148 match_strlcpy(args->ar_lockproto, &tmp[0],
149 GFS2_LOCKNAME_LEN);
150 break;
151 case Opt_locktable:
152 match_strlcpy(args->ar_locktable, &tmp[0],
153 GFS2_LOCKNAME_LEN);
154 break;
155 case Opt_hostdata:
156 match_strlcpy(args->ar_hostdata, &tmp[0],
157 GFS2_LOCKNAME_LEN);
158 break;
159 case Opt_spectator:
160 args->ar_spectator = 1;
161 break;
162 case Opt_ignore_local_fs:
Steven Whitehousef57a0242010-09-23 13:41:42 +0100163 /* Retained for backwards compat only */
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100164 break;
165 case Opt_localflocks:
166 args->ar_localflocks = 1;
167 break;
168 case Opt_localcaching:
Steven Whitehousec2048b002010-09-23 14:00:31 +0100169 /* Retained for backwards compat only */
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100170 break;
171 case Opt_debug:
Bob Petersond34843d2009-08-24 10:44:18 +0100172 if (args->ar_errors == GFS2_ERRORS_PANIC) {
Steven Whitehousef55073f2009-09-28 10:30:49 +0100173 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
Bob Petersond34843d2009-08-24 10:44:18 +0100174 "are mutually exclusive.\n");
175 return -EINVAL;
176 }
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100177 args->ar_debug = 1;
178 break;
179 case Opt_nodebug:
180 args->ar_debug = 0;
181 break;
182 case Opt_upgrade:
Steven Whitehousec80dbb52010-09-24 09:55:07 +0100183 /* Retained for backwards compat only */
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100184 break;
185 case Opt_acl:
186 args->ar_posix_acl = 1;
187 break;
188 case Opt_noacl:
189 args->ar_posix_acl = 0;
190 break;
191 case Opt_quota_off:
192 case Opt_noquota:
193 args->ar_quota = GFS2_QUOTA_OFF;
194 break;
195 case Opt_quota_account:
196 args->ar_quota = GFS2_QUOTA_ACCOUNT;
197 break;
198 case Opt_quota_on:
199 case Opt_quota:
200 args->ar_quota = GFS2_QUOTA_ON;
201 break;
202 case Opt_suiddir:
203 args->ar_suiddir = 1;
204 break;
205 case Opt_nosuiddir:
206 args->ar_suiddir = 0;
207 break;
208 case Opt_data_writeback:
209 args->ar_data = GFS2_DATA_WRITEBACK;
210 break;
211 case Opt_data_ordered:
212 args->ar_data = GFS2_DATA_ORDERED;
213 break;
214 case Opt_meta:
215 args->ar_meta = 1;
216 break;
217 case Opt_discard:
218 args->ar_discard = 1;
219 break;
220 case Opt_nodiscard:
221 args->ar_discard = 0;
222 break;
223 case Opt_commit:
224 rv = match_int(&tmp[0], &args->ar_commit);
225 if (rv || args->ar_commit <= 0) {
Steven Whitehousef55073f2009-09-28 10:30:49 +0100226 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100227 return rv ? rv : -EINVAL;
228 }
229 break;
Benjamin Marzinski3d3c10f2009-10-20 02:39:44 -0500230 case Opt_statfs_quantum:
231 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
232 if (rv || args->ar_statfs_quantum < 0) {
233 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
234 return rv ? rv : -EINVAL;
235 }
236 break;
237 case Opt_quota_quantum:
238 rv = match_int(&tmp[0], &args->ar_quota_quantum);
239 if (rv || args->ar_quota_quantum <= 0) {
240 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
241 return rv ? rv : -EINVAL;
242 }
243 break;
244 case Opt_statfs_percent:
245 rv = match_int(&tmp[0], &args->ar_statfs_percent);
246 if (rv || args->ar_statfs_percent < 0 ||
247 args->ar_statfs_percent > 100) {
248 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
249 return rv ? rv : -EINVAL;
250 }
251 break;
Bob Petersond34843d2009-08-24 10:44:18 +0100252 case Opt_err_withdraw:
253 args->ar_errors = GFS2_ERRORS_WITHDRAW;
254 break;
255 case Opt_err_panic:
256 if (args->ar_debug) {
Steven Whitehousef55073f2009-09-28 10:30:49 +0100257 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
Bob Petersond34843d2009-08-24 10:44:18 +0100258 "are mutually exclusive.\n");
259 return -EINVAL;
260 }
261 args->ar_errors = GFS2_ERRORS_PANIC;
262 break;
Christoph Hellwigf25934c2009-10-30 08:03:27 +0100263 case Opt_barrier:
264 args->ar_nobarrier = 0;
265 break;
266 case Opt_nobarrier:
267 args->ar_nobarrier = 1;
268 break;
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100269 case Opt_error:
270 default:
Steven Whitehousef55073f2009-09-28 10:30:49 +0100271 printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100272 return -EINVAL;
273 }
274 }
275
276 return 0;
277}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000278
Steven Whitehousefefc03b2008-12-19 15:32:06 +0000279/**
280 * gfs2_jindex_free - Clear all the journal index information
281 * @sdp: The GFS2 superblock
282 *
283 */
284
285void gfs2_jindex_free(struct gfs2_sbd *sdp)
286{
287 struct list_head list, *head;
288 struct gfs2_jdesc *jd;
289 struct gfs2_journal_extent *jext;
290
291 spin_lock(&sdp->sd_jindex_spin);
292 list_add(&list, &sdp->sd_jindex_list);
293 list_del_init(&sdp->sd_jindex_list);
294 sdp->sd_journals = 0;
295 spin_unlock(&sdp->sd_jindex_spin);
296
297 while (!list_empty(&list)) {
298 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
299 head = &jd->extent_list;
300 while (!list_empty(head)) {
301 jext = list_entry(head->next,
302 struct gfs2_journal_extent,
303 extent_list);
304 list_del(&jext->extent_list);
305 kfree(jext);
306 }
307 list_del(&jd->jd_list);
308 iput(jd->jd_inode);
309 kfree(jd);
310 }
311}
312
David Teiglandb3b94fa2006-01-16 16:50:04 +0000313static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
314{
315 struct gfs2_jdesc *jd;
316 int found = 0;
317
318 list_for_each_entry(jd, head, jd_list) {
319 if (jd->jd_jid == jid) {
320 found = 1;
321 break;
322 }
323 }
324
325 if (!found)
326 jd = NULL;
327
328 return jd;
329}
330
331struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
332{
333 struct gfs2_jdesc *jd;
334
335 spin_lock(&sdp->sd_jindex_spin);
336 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
337 spin_unlock(&sdp->sd_jindex_spin);
338
339 return jd;
340}
341
David Teiglandb3b94fa2006-01-16 16:50:04 +0000342int gfs2_jdesc_check(struct gfs2_jdesc *jd)
343{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400344 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
345 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100346 u64 size = i_size_read(jd->jd_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000347
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100348 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000349 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000350
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100351 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
352
353 if (gfs2_write_alloc_required(ip, 0, size)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000354 gfs2_consist_inode(ip);
Bob Peterson461cb412010-06-24 19:21:20 -0400355 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000356 }
357
Bob Peterson461cb412010-06-24 19:21:20 -0400358 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000359}
360
David Teiglandb3b94fa2006-01-16 16:50:04 +0000361/**
362 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
363 * @sdp: the filesystem
364 *
365 * Returns: errno
366 */
367
368int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
369{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400370 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500371 struct gfs2_glock *j_gl = ip->i_gl;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000372 struct gfs2_holder t_gh;
Al Viro55167622006-10-13 21:47:13 -0400373 struct gfs2_log_header_host head;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000374 int error;
375
Steven Whitehouse1c0f4872007-01-22 12:10:39 -0500376 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000377 if (error)
378 return error;
379
Steven Whitehouse1a14d3a2006-11-20 10:37:45 -0500380 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000381
382 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
383 if (error)
384 goto fail;
385
386 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
387 gfs2_consist(sdp);
388 error = -EIO;
389 goto fail;
390 }
391
392 /* Initialize some head of the log stuff */
393 sdp->sd_log_sequence = head.lh_sequence + 1;
394 gfs2_log_pointers_init(sdp, head.lh_blkno);
395
David Teiglandb3b94fa2006-01-16 16:50:04 +0000396 error = gfs2_quota_init(sdp);
397 if (error)
Steven Whitehousea91ea692006-09-04 12:04:26 -0400398 goto fail;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000399
400 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
401
402 gfs2_glock_dq_uninit(&t_gh);
403
404 return 0;
405
Steven Whitehousea91ea692006-09-04 12:04:26 -0400406fail:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000407 t_gh.gh_flags |= GL_NOCACHE;
408 gfs2_glock_dq_uninit(&t_gh);
409
410 return error;
411}
412
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500413void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
Steven Whitehousebb8d8a62007-06-01 14:11:58 +0100414{
415 const struct gfs2_statfs_change *str = buf;
416
417 sc->sc_total = be64_to_cpu(str->sc_total);
418 sc->sc_free = be64_to_cpu(str->sc_free);
419 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
420}
421
422static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
423{
424 struct gfs2_statfs_change *str = buf;
425
426 str->sc_total = cpu_to_be64(sc->sc_total);
427 str->sc_free = cpu_to_be64(sc->sc_free);
428 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
429}
430
David Teiglandb3b94fa2006-01-16 16:50:04 +0000431int gfs2_statfs_init(struct gfs2_sbd *sdp)
432{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400433 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
Al Virobd209cc2006-10-13 23:43:19 -0400434 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400435 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
Al Virobd209cc2006-10-13 23:43:19 -0400436 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000437 struct buffer_head *m_bh, *l_bh;
438 struct gfs2_holder gh;
439 int error;
440
441 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
442 &gh);
443 if (error)
444 return error;
445
446 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
447 if (error)
448 goto out;
449
450 if (sdp->sd_args.ar_spectator) {
451 spin_lock(&sdp->sd_statfs_spin);
452 gfs2_statfs_change_in(m_sc, m_bh->b_data +
453 sizeof(struct gfs2_dinode));
454 spin_unlock(&sdp->sd_statfs_spin);
455 } else {
456 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
457 if (error)
458 goto out_m_bh;
459
460 spin_lock(&sdp->sd_statfs_spin);
461 gfs2_statfs_change_in(m_sc, m_bh->b_data +
462 sizeof(struct gfs2_dinode));
463 gfs2_statfs_change_in(l_sc, l_bh->b_data +
464 sizeof(struct gfs2_dinode));
465 spin_unlock(&sdp->sd_statfs_spin);
466
467 brelse(l_bh);
468 }
469
Steven Whitehousea91ea692006-09-04 12:04:26 -0400470out_m_bh:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000471 brelse(m_bh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400472out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000473 gfs2_glock_dq_uninit(&gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000474 return 0;
475}
476
Steven Whitehousecd915492006-09-04 12:49:07 -0400477void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
478 s64 dinodes)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000479{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400480 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
Al Virobd209cc2006-10-13 23:43:19 -0400481 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
Benjamin Marzinski3d3c10f2009-10-20 02:39:44 -0500482 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000483 struct buffer_head *l_bh;
Benjamin Marzinskic14f5732009-10-26 13:29:47 -0500484 s64 x, y;
485 int need_sync = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000486 int error;
487
488 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
489 if (error)
490 return;
491
Steven Whitehoused4e9c4c2006-01-18 11:19:28 +0000492 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000493
494 spin_lock(&sdp->sd_statfs_spin);
495 l_sc->sc_total += total;
496 l_sc->sc_free += free;
497 l_sc->sc_dinodes += dinodes;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400498 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
Benjamin Marzinskic14f5732009-10-26 13:29:47 -0500499 if (sdp->sd_args.ar_statfs_percent) {
500 x = 100 * l_sc->sc_free;
501 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
502 if (x >= y || x <= -y)
503 need_sync = 1;
504 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000505 spin_unlock(&sdp->sd_statfs_spin);
506
507 brelse(l_bh);
Benjamin Marzinskic14f5732009-10-26 13:29:47 -0500508 if (need_sync)
Benjamin Marzinski3d3c10f2009-10-20 02:39:44 -0500509 gfs2_wake_up_statfs(sdp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000510}
511
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500512void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
513 struct buffer_head *l_bh)
514{
515 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
516 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
517 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
518 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
519
520 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
521
522 spin_lock(&sdp->sd_statfs_spin);
523 m_sc->sc_total += l_sc->sc_total;
524 m_sc->sc_free += l_sc->sc_free;
525 m_sc->sc_dinodes += l_sc->sc_dinodes;
526 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
527 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
528 0, sizeof(struct gfs2_statfs_change));
529 spin_unlock(&sdp->sd_statfs_spin);
530
531 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
532 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
533}
534
Steven Whitehouse8c42d632009-09-11 14:36:44 +0100535int gfs2_statfs_sync(struct super_block *sb, int type)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000536{
Steven Whitehouse8c42d632009-09-11 14:36:44 +0100537 struct gfs2_sbd *sdp = sb->s_fs_info;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400538 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
539 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
Al Virobd209cc2006-10-13 23:43:19 -0400540 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
541 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000542 struct gfs2_holder gh;
543 struct buffer_head *m_bh, *l_bh;
544 int error;
545
546 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
547 &gh);
548 if (error)
549 return error;
550
551 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
552 if (error)
553 goto out;
554
555 spin_lock(&sdp->sd_statfs_spin);
556 gfs2_statfs_change_in(m_sc, m_bh->b_data +
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400557 sizeof(struct gfs2_dinode));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000558 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
559 spin_unlock(&sdp->sd_statfs_spin);
560 goto out_bh;
561 }
562 spin_unlock(&sdp->sd_statfs_spin);
563
564 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
565 if (error)
566 goto out_bh;
567
568 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
569 if (error)
570 goto out_bh2;
571
Benjamin Marzinski1946f702009-06-25 15:09:51 -0500572 update_statfs(sdp, m_bh, l_bh);
Benjamin Marzinski3d3c10f2009-10-20 02:39:44 -0500573 sdp->sd_statfs_force_sync = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000574
575 gfs2_trans_end(sdp);
576
Steven Whitehousea91ea692006-09-04 12:04:26 -0400577out_bh2:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000578 brelse(l_bh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400579out_bh:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000580 brelse(m_bh);
Steven Whitehousea91ea692006-09-04 12:04:26 -0400581out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000582 gfs2_glock_dq_uninit(&gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000583 return error;
584}
585
David Teiglandb3b94fa2006-01-16 16:50:04 +0000586struct lfcc {
587 struct list_head list;
588 struct gfs2_holder gh;
589};
590
591/**
592 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
593 * journals are clean
594 * @sdp: the file system
595 * @state: the state to put the transaction lock into
596 * @t_gh: the hold on the transaction lock
597 *
598 * Returns: errno
599 */
600
Adrian Bunk08bc2db2006-04-28 10:59:12 -0400601static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
602 struct gfs2_holder *t_gh)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000603{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500604 struct gfs2_inode *ip;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000605 struct gfs2_jdesc *jd;
606 struct lfcc *lfcc;
607 LIST_HEAD(list);
Al Viro55167622006-10-13 21:47:13 -0400608 struct gfs2_log_header_host lh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000609 int error;
610
David Teiglandb3b94fa2006-01-16 16:50:04 +0000611 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
612 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
613 if (!lfcc) {
614 error = -ENOMEM;
615 goto out;
616 }
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400617 ip = GFS2_I(jd->jd_inode);
618 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000619 if (error) {
620 kfree(lfcc);
621 goto out;
622 }
623 list_add(&lfcc->list, &list);
624 }
625
626 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
Steven Whitehouse6802e342008-05-21 17:03:22 +0100627 GL_NOCACHE, t_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000628
629 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
630 error = gfs2_jdesc_check(jd);
631 if (error)
632 break;
633 error = gfs2_find_jhead(jd, &lh);
634 if (error)
635 break;
636 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
637 error = -EBUSY;
638 break;
639 }
640 }
641
642 if (error)
643 gfs2_glock_dq_uninit(t_gh);
644
Steven Whitehousea91ea692006-09-04 12:04:26 -0400645out:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000646 while (!list_empty(&list)) {
647 lfcc = list_entry(list.next, struct lfcc, list);
648 list_del(&lfcc->list);
649 gfs2_glock_dq_uninit(&lfcc->gh);
650 kfree(lfcc);
651 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000652 return error;
653}
654
655/**
656 * gfs2_freeze_fs - freezes the file system
657 * @sdp: the file system
658 *
659 * This function flushes data and meta data for all machines by
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300660 * acquiring the transaction log exclusively. All journals are
David Teiglandb3b94fa2006-01-16 16:50:04 +0000661 * ensured to be in a clean state as well.
662 *
663 * Returns: errno
664 */
665
666int gfs2_freeze_fs(struct gfs2_sbd *sdp)
667{
668 int error = 0;
669
Steven Whitehousef55ab262006-02-21 12:51:39 +0000670 mutex_lock(&sdp->sd_freeze_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000671
672 if (!sdp->sd_freeze_count++) {
673 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
674 if (error)
675 sdp->sd_freeze_count--;
676 }
677
Steven Whitehousef55ab262006-02-21 12:51:39 +0000678 mutex_unlock(&sdp->sd_freeze_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000679
680 return error;
681}
682
683/**
684 * gfs2_unfreeze_fs - unfreezes the file system
685 * @sdp: the file system
686 *
687 * This function allows the file system to proceed by unlocking
688 * the exclusively held transaction lock. Other GFS2 nodes are
689 * now free to acquire the lock shared and go on with their lives.
690 *
691 */
692
693void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
694{
Steven Whitehousef55ab262006-02-21 12:51:39 +0000695 mutex_lock(&sdp->sd_freeze_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000696
697 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
698 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
699
Steven Whitehousef55ab262006-02-21 12:51:39 +0000700 mutex_unlock(&sdp->sd_freeze_lock);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000701}
702
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100703
704/**
705 * gfs2_write_inode - Make sure the inode is stable on the disk
706 * @inode: The inode
Steven Whitehouse1027efa2011-03-30 16:13:25 +0100707 * @wbc: The writeback control structure
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100708 *
709 * Returns: errno
710 */
711
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100712static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100713{
714 struct gfs2_inode *ip = GFS2_I(inode);
715 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse1027efa2011-03-30 16:13:25 +0100716 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100717 struct gfs2_holder gh;
718 struct buffer_head *bh;
719 struct timespec atime;
720 struct gfs2_dinode *di;
Steven Whitehouse1027efa2011-03-30 16:13:25 +0100721 int ret = -EAGAIN;
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100722
Steven Whitehouse1027efa2011-03-30 16:13:25 +0100723 /* Skip timestamp update, if this is from a memalloc */
Steven Whitehouse009d8512009-12-08 12:12:13 +0000724 if (current->flags & PF_MEMALLOC)
Steven Whitehouse1027efa2011-03-30 16:13:25 +0100725 goto do_flush;
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100726 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
727 if (ret)
728 goto do_flush;
729 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
730 if (ret)
731 goto do_unlock;
732 ret = gfs2_meta_inode_buffer(ip, &bh);
733 if (ret == 0) {
734 di = (struct gfs2_dinode *)bh->b_data;
735 atime.tv_sec = be64_to_cpu(di->di_atime);
736 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
737 if (timespec_compare(&inode->i_atime, &atime) > 0) {
738 gfs2_trans_add_bh(ip->i_gl, bh, 1);
739 gfs2_dinode_out(ip, bh->b_data);
740 }
741 brelse(bh);
742 }
743 gfs2_trans_end(sdp);
744do_unlock:
745 gfs2_glock_dq_uninit(&gh);
746do_flush:
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100747 if (wbc->sync_mode == WB_SYNC_ALL)
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100748 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
Steven Whitehouse1027efa2011-03-30 16:13:25 +0100749 filemap_fdatawrite(metamapping);
750 if (!ret && (wbc->sync_mode == WB_SYNC_ALL))
751 ret = filemap_fdatawait(metamapping);
752 if (ret)
753 mark_inode_dirty_sync(inode);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100754 return ret;
755}
756
757/**
758 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
759 * @sdp: the filesystem
760 *
761 * Returns: errno
762 */
763
764static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
765{
766 struct gfs2_holder t_gh;
767 int error;
768
Benjamin Marzinskib94a1702009-07-23 18:52:34 -0500769 flush_workqueue(gfs2_delete_workqueue);
Christoph Hellwig5fb324a2010-02-16 03:44:52 -0500770 gfs2_quota_sync(sdp->sd_vfs, 0, 1);
Steven Whitehouse8c42d632009-09-11 14:36:44 +0100771 gfs2_statfs_sync(sdp->sd_vfs, 0);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100772
773 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
774 &t_gh);
775 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
776 return error;
777
778 gfs2_meta_syncfs(sdp);
779 gfs2_log_shutdown(sdp);
780
781 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
782
783 if (t_gh.gh_gl)
784 gfs2_glock_dq_uninit(&t_gh);
785
786 gfs2_quota_cleanup(sdp);
787
788 return error;
789}
790
791static int gfs2_umount_recovery_wait(void *word)
792{
793 schedule();
794 return 0;
795}
796
797/**
798 * gfs2_put_super - Unmount the filesystem
799 * @sb: The VFS superblock
800 *
801 */
802
803static void gfs2_put_super(struct super_block *sb)
804{
805 struct gfs2_sbd *sdp = sb->s_fs_info;
806 int error;
807 struct gfs2_jdesc *jd;
808
809 /* Unfreeze the filesystem, if we need to */
810
811 mutex_lock(&sdp->sd_freeze_lock);
812 if (sdp->sd_freeze_count)
813 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
814 mutex_unlock(&sdp->sd_freeze_lock);
815
816 /* No more recovery requests */
817 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
818 smp_mb();
819
820 /* Wait on outstanding recovery */
821restart:
822 spin_lock(&sdp->sd_jindex_spin);
823 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
824 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
825 continue;
826 spin_unlock(&sdp->sd_jindex_spin);
827 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
828 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
829 goto restart;
830 }
831 spin_unlock(&sdp->sd_jindex_spin);
832
833 kthread_stop(sdp->sd_quotad_process);
834 kthread_stop(sdp->sd_logd_process);
835
836 if (!(sb->s_flags & MS_RDONLY)) {
837 error = gfs2_make_fs_ro(sdp);
838 if (error)
839 gfs2_io_error(sdp);
840 }
841 /* At this point, we're through modifying the disk */
842
843 /* Release stuff */
844
845 iput(sdp->sd_jindex);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100846 iput(sdp->sd_statfs_inode);
847 iput(sdp->sd_rindex);
848 iput(sdp->sd_quota_inode);
849
850 gfs2_glock_put(sdp->sd_rename_gl);
851 gfs2_glock_put(sdp->sd_trans_gl);
852
853 if (!sdp->sd_args.ar_spectator) {
854 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
855 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100856 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
857 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100858 iput(sdp->sd_sc_inode);
859 iput(sdp->sd_qc_inode);
860 }
861
862 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
863 gfs2_clear_rgrpd(sdp);
864 gfs2_jindex_free(sdp);
865 /* Take apart glock structures and buffer lists */
866 gfs2_gl_hash_clear(sdp);
867 /* Unmount the locking protocol */
868 gfs2_lm_unmount(sdp);
869
870 /* At this point, we're through participating in the lockspace */
871 gfs2_sys_fs_del(sdp);
872}
873
874/**
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100875 * gfs2_sync_fs - sync the filesystem
876 * @sb: the superblock
877 *
878 * Flushes the log to disk.
879 */
880
881static int gfs2_sync_fs(struct super_block *sb, int wait)
882{
Steven Whitehouse1027efa2011-03-30 16:13:25 +0100883 struct gfs2_sbd *sdp = sb->s_fs_info;
884 if (wait && sdp)
885 gfs2_log_flush(sdp, NULL);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +0100886 return 0;
887}
888
889/**
890 * gfs2_freeze - prevent further writes to the filesystem
891 * @sb: the VFS structure for the filesystem
892 *
893 */
894
895static int gfs2_freeze(struct super_block *sb)
896{
897 struct gfs2_sbd *sdp = sb->s_fs_info;
898 int error;
899
900 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
901 return -EINVAL;
902
903 for (;;) {
904 error = gfs2_freeze_fs(sdp);
905 if (!error)
906 break;
907
908 switch (error) {
909 case -EBUSY:
910 fs_err(sdp, "waiting for recovery before freeze\n");
911 break;
912
913 default:
914 fs_err(sdp, "error freezing FS: %d\n", error);
915 break;
916 }
917
918 fs_err(sdp, "retrying...\n");
919 msleep(1000);
920 }
921 return 0;
922}
923
924/**
925 * gfs2_unfreeze - reallow writes to the filesystem
926 * @sb: the VFS structure for the filesystem
927 *
928 */
929
930static int gfs2_unfreeze(struct super_block *sb)
931{
932 gfs2_unfreeze_fs(sb->s_fs_info);
933 return 0;
934}
935
936/**
937 * statfs_fill - fill in the sg for a given RG
938 * @rgd: the RG
939 * @sc: the sc structure
940 *
941 * Returns: 0 on success, -ESTALE if the LVB is invalid
942 */
943
944static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
945 struct gfs2_statfs_change_host *sc)
946{
947 gfs2_rgrp_verify(rgd);
948 sc->sc_total += rgd->rd_data;
949 sc->sc_free += rgd->rd_free;
950 sc->sc_dinodes += rgd->rd_dinodes;
951 return 0;
952}
953
954/**
955 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
956 * @sdp: the filesystem
957 * @sc: the sc info that will be returned
958 *
959 * Any error (other than a signal) will cause this routine to fall back
960 * to the synchronous version.
961 *
962 * FIXME: This really shouldn't busy wait like this.
963 *
964 * Returns: errno
965 */
966
967static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
968{
969 struct gfs2_holder ri_gh;
970 struct gfs2_rgrpd *rgd_next;
971 struct gfs2_holder *gha, *gh;
972 unsigned int slots = 64;
973 unsigned int x;
974 int done;
975 int error = 0, err;
976
977 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
978 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
979 if (!gha)
980 return -ENOMEM;
981
982 error = gfs2_rindex_hold(sdp, &ri_gh);
983 if (error)
984 goto out;
985
986 rgd_next = gfs2_rgrpd_get_first(sdp);
987
988 for (;;) {
989 done = 1;
990
991 for (x = 0; x < slots; x++) {
992 gh = gha + x;
993
994 if (gh->gh_gl && gfs2_glock_poll(gh)) {
995 err = gfs2_glock_wait(gh);
996 if (err) {
997 gfs2_holder_uninit(gh);
998 error = err;
999 } else {
1000 if (!error)
1001 error = statfs_slow_fill(
1002 gh->gh_gl->gl_object, sc);
1003 gfs2_glock_dq_uninit(gh);
1004 }
1005 }
1006
1007 if (gh->gh_gl)
1008 done = 0;
1009 else if (rgd_next && !error) {
1010 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1011 LM_ST_SHARED,
1012 GL_ASYNC,
1013 gh);
1014 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1015 done = 0;
1016 }
1017
1018 if (signal_pending(current))
1019 error = -ERESTARTSYS;
1020 }
1021
1022 if (done)
1023 break;
1024
1025 yield();
1026 }
1027
1028 gfs2_glock_dq_uninit(&ri_gh);
1029
1030out:
1031 kfree(gha);
1032 return error;
1033}
1034
1035/**
1036 * gfs2_statfs_i - Do a statfs
1037 * @sdp: the filesystem
1038 * @sg: the sg structure
1039 *
1040 * Returns: errno
1041 */
1042
1043static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1044{
1045 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1046 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1047
1048 spin_lock(&sdp->sd_statfs_spin);
1049
1050 *sc = *m_sc;
1051 sc->sc_total += l_sc->sc_total;
1052 sc->sc_free += l_sc->sc_free;
1053 sc->sc_dinodes += l_sc->sc_dinodes;
1054
1055 spin_unlock(&sdp->sd_statfs_spin);
1056
1057 if (sc->sc_free < 0)
1058 sc->sc_free = 0;
1059 if (sc->sc_free > sc->sc_total)
1060 sc->sc_free = sc->sc_total;
1061 if (sc->sc_dinodes < 0)
1062 sc->sc_dinodes = 0;
1063
1064 return 0;
1065}
1066
1067/**
1068 * gfs2_statfs - Gather and return stats about the filesystem
1069 * @sb: The superblock
1070 * @statfsbuf: The buffer
1071 *
1072 * Returns: 0 on success or error code
1073 */
1074
1075static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1076{
1077 struct super_block *sb = dentry->d_inode->i_sb;
1078 struct gfs2_sbd *sdp = sb->s_fs_info;
1079 struct gfs2_statfs_change_host sc;
1080 int error;
1081
1082 if (gfs2_tune_get(sdp, gt_statfs_slow))
1083 error = gfs2_statfs_slow(sdp, &sc);
1084 else
1085 error = gfs2_statfs_i(sdp, &sc);
1086
1087 if (error)
1088 return error;
1089
1090 buf->f_type = GFS2_MAGIC;
1091 buf->f_bsize = sdp->sd_sb.sb_bsize;
1092 buf->f_blocks = sc.sc_total;
1093 buf->f_bfree = sc.sc_free;
1094 buf->f_bavail = sc.sc_free;
1095 buf->f_files = sc.sc_dinodes + sc.sc_free;
1096 buf->f_ffree = sc.sc_free;
1097 buf->f_namelen = GFS2_FNAMESIZE;
1098
1099 return 0;
1100}
1101
1102/**
1103 * gfs2_remount_fs - called when the FS is remounted
1104 * @sb: the filesystem
1105 * @flags: the remount flags
1106 * @data: extra data passed in (not used right now)
1107 *
1108 * Returns: errno
1109 */
1110
1111static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1112{
1113 struct gfs2_sbd *sdp = sb->s_fs_info;
1114 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1115 struct gfs2_tune *gt = &sdp->sd_tune;
1116 int error;
1117
1118 spin_lock(&gt->gt_spin);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -05001119 args.ar_commit = gt->gt_logd_secs;
Benjamin Marzinski3d3c10f2009-10-20 02:39:44 -05001120 args.ar_quota_quantum = gt->gt_quota_quantum;
1121 if (gt->gt_statfs_slow)
1122 args.ar_statfs_quantum = 0;
1123 else
1124 args.ar_statfs_quantum = gt->gt_statfs_quantum;
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001125 spin_unlock(&gt->gt_spin);
Steven Whitehousef55073f2009-09-28 10:30:49 +01001126 error = gfs2_mount_args(&args, data);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001127 if (error)
1128 return error;
1129
1130 /* Not allowed to change locking details */
1131 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1132 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1133 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1134 return -EINVAL;
1135
1136 /* Some flags must not be changed */
1137 if (args_neq(&args, &sdp->sd_args, spectator) ||
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001138 args_neq(&args, &sdp->sd_args, localflocks) ||
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001139 args_neq(&args, &sdp->sd_args, meta))
1140 return -EINVAL;
1141
1142 if (sdp->sd_args.ar_spectator)
1143 *flags |= MS_RDONLY;
1144
1145 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1146 if (*flags & MS_RDONLY)
1147 error = gfs2_make_fs_ro(sdp);
1148 else
1149 error = gfs2_make_fs_rw(sdp);
1150 if (error)
1151 return error;
1152 }
1153
1154 sdp->sd_args = args;
1155 if (sdp->sd_args.ar_posix_acl)
1156 sb->s_flags |= MS_POSIXACL;
1157 else
1158 sb->s_flags &= ~MS_POSIXACL;
Christoph Hellwigf25934c2009-10-30 08:03:27 +01001159 if (sdp->sd_args.ar_nobarrier)
1160 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1161 else
1162 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001163 spin_lock(&gt->gt_spin);
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -05001164 gt->gt_logd_secs = args.ar_commit;
Benjamin Marzinski3d3c10f2009-10-20 02:39:44 -05001165 gt->gt_quota_quantum = args.ar_quota_quantum;
1166 if (args.ar_statfs_quantum) {
1167 gt->gt_statfs_slow = 0;
1168 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1169 }
1170 else {
1171 gt->gt_statfs_slow = 1;
1172 gt->gt_statfs_quantum = 30;
1173 }
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001174 spin_unlock(&gt->gt_spin);
1175
Steven Whitehouse8633ecf2009-07-31 11:07:29 +01001176 gfs2_online_uevent(sdp);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001177 return 0;
1178}
1179
1180/**
1181 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1182 * @inode: The inode to drop
1183 *
1184 * If we've received a callback on an iopen lock then its because a
1185 * remote node tried to deallocate the inode but failed due to this node
1186 * still having the inode open. Here we mark the link count zero
1187 * since we know that it must have reached zero if the GLF_DEMOTE flag
1188 * is set on the iopen glock. If we didn't do a disk read since the
1189 * remote node removed the final link then we might otherwise miss
1190 * this event. This check ensures that this node will deallocate the
1191 * inode's blocks, or alternatively pass the baton on to another
1192 * node for later deallocation.
1193 */
1194
Al Viro45321ac2010-06-07 13:43:19 -04001195static int gfs2_drop_inode(struct inode *inode)
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001196{
1197 struct gfs2_inode *ip = GFS2_I(inode);
1198
Steven Whitehouse009d8512009-12-08 12:12:13 +00001199 if (inode->i_nlink) {
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001200 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1201 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1202 clear_nlink(inode);
1203 }
Al Viro45321ac2010-06-07 13:43:19 -04001204 return generic_drop_inode(inode);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001205}
1206
1207static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1208{
1209 do {
1210 if (d1 == d2)
1211 return 1;
1212 d1 = d1->d_parent;
1213 } while (!IS_ROOT(d1));
1214 return 0;
1215}
1216
1217/**
1218 * gfs2_show_options - Show mount options for /proc/mounts
1219 * @s: seq_file structure
1220 * @mnt: vfsmount
1221 *
1222 * Returns: 0 on success or error code
1223 */
1224
1225static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1226{
1227 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1228 struct gfs2_args *args = &sdp->sd_args;
Benjamin Marzinski3d3c10f2009-10-20 02:39:44 -05001229 int val;
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001230
1231 if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1232 seq_printf(s, ",meta");
1233 if (args->ar_lockproto[0])
1234 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1235 if (args->ar_locktable[0])
1236 seq_printf(s, ",locktable=%s", args->ar_locktable);
1237 if (args->ar_hostdata[0])
1238 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1239 if (args->ar_spectator)
1240 seq_printf(s, ",spectator");
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001241 if (args->ar_localflocks)
1242 seq_printf(s, ",localflocks");
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001243 if (args->ar_debug)
1244 seq_printf(s, ",debug");
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001245 if (args->ar_posix_acl)
1246 seq_printf(s, ",acl");
1247 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1248 char *state;
1249 switch (args->ar_quota) {
1250 case GFS2_QUOTA_OFF:
1251 state = "off";
1252 break;
1253 case GFS2_QUOTA_ACCOUNT:
1254 state = "account";
1255 break;
1256 case GFS2_QUOTA_ON:
1257 state = "on";
1258 break;
1259 default:
1260 state = "unknown";
1261 break;
1262 }
1263 seq_printf(s, ",quota=%s", state);
1264 }
1265 if (args->ar_suiddir)
1266 seq_printf(s, ",suiddir");
1267 if (args->ar_data != GFS2_DATA_DEFAULT) {
1268 char *state;
1269 switch (args->ar_data) {
1270 case GFS2_DATA_WRITEBACK:
1271 state = "writeback";
1272 break;
1273 case GFS2_DATA_ORDERED:
1274 state = "ordered";
1275 break;
1276 default:
1277 state = "unknown";
1278 break;
1279 }
1280 seq_printf(s, ",data=%s", state);
1281 }
1282 if (args->ar_discard)
1283 seq_printf(s, ",discard");
Benjamin Marzinski5e687ea2010-05-04 14:29:16 -05001284 val = sdp->sd_tune.gt_logd_secs;
1285 if (val != 30)
Benjamin Marzinski3d3c10f2009-10-20 02:39:44 -05001286 seq_printf(s, ",commit=%d", val);
1287 val = sdp->sd_tune.gt_statfs_quantum;
1288 if (val != 30)
1289 seq_printf(s, ",statfs_quantum=%d", val);
1290 val = sdp->sd_tune.gt_quota_quantum;
1291 if (val != 60)
1292 seq_printf(s, ",quota_quantum=%d", val);
1293 if (args->ar_statfs_percent)
1294 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
Bob Petersond34843d2009-08-24 10:44:18 +01001295 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1296 const char *state;
1297
1298 switch (args->ar_errors) {
1299 case GFS2_ERRORS_WITHDRAW:
1300 state = "withdraw";
1301 break;
1302 case GFS2_ERRORS_PANIC:
1303 state = "panic";
1304 break;
1305 default:
1306 state = "unknown";
1307 break;
1308 }
1309 seq_printf(s, ",errors=%s", state);
1310 }
Steven Whitehousecdcfde62009-10-30 10:48:53 +00001311 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1312 seq_printf(s, ",nobarrier");
Steven Whitehouse913a71d2010-05-06 11:03:29 +01001313 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1314 seq_printf(s, ",demote_interface_used");
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001315 return 0;
1316}
1317
1318/*
1319 * We have to (at the moment) hold the inodes main lock to cover
1320 * the gap between unlocking the shared lock on the iopen lock and
1321 * taking the exclusive lock. I'd rather do a shared -> exclusive
1322 * conversion on the iopen lock, but we can change that later. This
1323 * is safe, just less efficient.
1324 */
1325
Al Virod5c15152010-06-07 11:05:19 -04001326static void gfs2_evict_inode(struct inode *inode)
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001327{
Steven Whitehouse001e8e82011-03-30 14:17:51 +01001328 struct super_block *sb = inode->i_sb;
1329 struct gfs2_sbd *sdp = sb->s_fs_info;
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001330 struct gfs2_inode *ip = GFS2_I(inode);
1331 struct gfs2_holder gh;
1332 int error;
1333
Steven Whitehouse001e8e82011-03-30 14:17:51 +01001334 if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
Al Virod5c15152010-06-07 11:05:19 -04001335 goto out;
1336
Bob Peterson44ad37d2011-03-17 16:19:58 -04001337 /* Must not read inode block until block type has been verified */
1338 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001339 if (unlikely(error)) {
1340 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1341 goto out;
1342 }
1343
Steven Whitehouseacf7e242009-09-08 18:00:30 +01001344 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1345 if (error)
1346 goto out_truncate;
1347
Bob Peterson44ad37d2011-03-17 16:19:58 -04001348 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1349 error = gfs2_inode_refresh(ip);
1350 if (error)
1351 goto out_truncate;
1352 }
1353
Benjamin Marzinski23c30102011-01-14 22:39:16 -06001354 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001355 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1356 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1357 error = gfs2_glock_nq(&ip->i_iopen_gh);
1358 if (error)
1359 goto out_truncate;
1360
1361 if (S_ISDIR(inode->i_mode) &&
1362 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1363 error = gfs2_dir_exhash_dealloc(ip);
1364 if (error)
1365 goto out_unlock;
1366 }
1367
1368 if (ip->i_eattr) {
1369 error = gfs2_ea_dealloc(ip);
1370 if (error)
1371 goto out_unlock;
1372 }
1373
1374 if (!gfs2_is_stuffed(ip)) {
1375 error = gfs2_file_dealloc(ip);
1376 if (error)
1377 goto out_unlock;
1378 }
1379
1380 error = gfs2_dinode_dealloc(ip);
1381 if (error)
1382 goto out_unlock;
1383
1384out_truncate:
1385 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1386 if (error)
1387 goto out_unlock;
1388 /* Needs to be done before glock release & also in a transaction */
1389 truncate_inode_pages(&inode->i_data, 0);
1390 gfs2_trans_end(sdp);
1391
1392out_unlock:
1393 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1394 gfs2_glock_dq(&ip->i_iopen_gh);
1395 gfs2_holder_uninit(&ip->i_iopen_gh);
1396 gfs2_glock_dq_uninit(&gh);
1397 if (error && error != GLR_TRYFAILED && error != -EROFS)
Al Virod5c15152010-06-07 11:05:19 -04001398 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001399out:
1400 truncate_inode_pages(&inode->i_data, 0);
Al Virod5c15152010-06-07 11:05:19 -04001401 end_writeback(inode);
1402
1403 ip->i_gl->gl_object = NULL;
Steven Whitehouse29687a22011-03-30 16:33:25 +01001404 gfs2_glock_add_to_lru(ip->i_gl);
Al Virod5c15152010-06-07 11:05:19 -04001405 gfs2_glock_put(ip->i_gl);
1406 ip->i_gl = NULL;
1407 if (ip->i_iopen_gh.gh_gl) {
1408 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1409 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1410 }
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001411}
1412
1413static struct inode *gfs2_alloc_inode(struct super_block *sb)
1414{
1415 struct gfs2_inode *ip;
1416
1417 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1418 if (ip) {
1419 ip->i_flags = 0;
1420 ip->i_gl = NULL;
1421 }
1422 return &ip->i_inode;
1423}
1424
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +11001425static void gfs2_i_callback(struct rcu_head *head)
1426{
1427 struct inode *inode = container_of(head, struct inode, i_rcu);
1428 INIT_LIST_HEAD(&inode->i_dentry);
1429 kmem_cache_free(gfs2_inode_cachep, inode);
1430}
1431
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001432static void gfs2_destroy_inode(struct inode *inode)
1433{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +11001434 call_rcu(&inode->i_rcu, gfs2_i_callback);
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001435}
1436
1437const struct super_operations gfs2_super_ops = {
1438 .alloc_inode = gfs2_alloc_inode,
1439 .destroy_inode = gfs2_destroy_inode,
1440 .write_inode = gfs2_write_inode,
Al Virod5c15152010-06-07 11:05:19 -04001441 .evict_inode = gfs2_evict_inode,
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001442 .put_super = gfs2_put_super,
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001443 .sync_fs = gfs2_sync_fs,
1444 .freeze_fs = gfs2_freeze,
1445 .unfreeze_fs = gfs2_unfreeze,
1446 .statfs = gfs2_statfs,
1447 .remount_fs = gfs2_remount_fs,
Steven Whitehouse9e6e0a12009-05-22 10:36:01 +01001448 .drop_inode = gfs2_drop_inode,
1449 .show_options = gfs2_show_options,
1450};
1451