xref: /openbmc/linux/fs/gfs2/sys.c (revision d088d6b6)
1  // SPDX-License-Identifier: GPL-2.0-only
2  /*
3   * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
4   * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
5   */
6  
7  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8  
9  #include <linux/sched.h>
10  #include <linux/cred.h>
11  #include <linux/spinlock.h>
12  #include <linux/completion.h>
13  #include <linux/buffer_head.h>
14  #include <linux/module.h>
15  #include <linux/kobject.h>
16  #include <linux/uaccess.h>
17  #include <linux/gfs2_ondisk.h>
18  #include <linux/blkdev.h>
19  
20  #include "gfs2.h"
21  #include "incore.h"
22  #include "sys.h"
23  #include "super.h"
24  #include "glock.h"
25  #include "quota.h"
26  #include "util.h"
27  #include "glops.h"
28  #include "recovery.h"
29  
30  struct gfs2_attr {
31  	struct attribute attr;
32  	ssize_t (*show)(struct gfs2_sbd *, char *);
33  	ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
34  };
35  
36  static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
37  			      char *buf)
38  {
39  	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
40  	struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
41  	return a->show ? a->show(sdp, buf) : 0;
42  }
43  
44  static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
45  			       const char *buf, size_t len)
46  {
47  	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
48  	struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
49  	return a->store ? a->store(sdp, buf, len) : len;
50  }
51  
52  static const struct sysfs_ops gfs2_attr_ops = {
53  	.show  = gfs2_attr_show,
54  	.store = gfs2_attr_store,
55  };
56  
57  
58  static struct kset *gfs2_kset;
59  
60  static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
61  {
62  	return snprintf(buf, PAGE_SIZE, "%u:%u\n",
63  			MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
64  }
65  
66  static ssize_t status_show(struct gfs2_sbd *sdp, char *buf)
67  {
68  	unsigned long f = sdp->sd_flags;
69  	ssize_t s;
70  
71  	s = snprintf(buf, PAGE_SIZE,
72  		     "Journal Checked:          %d\n"
73  		     "Journal Live:             %d\n"
74  		     "Journal ID:               %d\n"
75  		     "Spectator:                %d\n"
76  		     "Withdrawn:                %d\n"
77  		     "No barriers:              %d\n"
78  		     "No recovery:              %d\n"
79  		     "Demote:                   %d\n"
80  		     "No Journal ID:            %d\n"
81  		     "Mounted RO:               %d\n"
82  		     "RO Recovery:              %d\n"
83  		     "Skip DLM Unlock:          %d\n"
84  		     "Force AIL Flush:          %d\n"
85  		     "FS Freeze Initiator:      %d\n"
86  		     "FS Frozen:                %d\n"
87  		     "Withdrawing:              %d\n"
88  		     "Withdraw In Prog:         %d\n"
89  		     "Remote Withdraw:          %d\n"
90  		     "Withdraw Recovery:        %d\n"
91  		     "Deactivating:             %d\n"
92  		     "sd_log_error:             %d\n"
93  		     "sd_log_flush_lock:        %d\n"
94  		     "sd_log_num_revoke:        %u\n"
95  		     "sd_log_in_flight:         %d\n"
96  		     "sd_log_blks_needed:       %d\n"
97  		     "sd_log_blks_free:         %d\n"
98  		     "sd_log_flush_head:        %d\n"
99  		     "sd_log_flush_tail:        %d\n"
100  		     "sd_log_blks_reserved:     %d\n"
101  		     "sd_log_revokes_available: %d\n",
102  		     test_bit(SDF_JOURNAL_CHECKED, &f),
103  		     test_bit(SDF_JOURNAL_LIVE, &f),
104  		     (sdp->sd_jdesc ? sdp->sd_jdesc->jd_jid : 0),
105  		     (sdp->sd_args.ar_spectator ? 1 : 0),
106  		     test_bit(SDF_WITHDRAWN, &f),
107  		     test_bit(SDF_NOBARRIERS, &f),
108  		     test_bit(SDF_NORECOVERY, &f),
109  		     test_bit(SDF_DEMOTE, &f),
110  		     test_bit(SDF_NOJOURNALID, &f),
111  		     (sb_rdonly(sdp->sd_vfs) ? 1 : 0),
112  		     test_bit(SDF_RORECOVERY, &f),
113  		     test_bit(SDF_SKIP_DLM_UNLOCK, &f),
114  		     test_bit(SDF_FORCE_AIL_FLUSH, &f),
115  		     test_bit(SDF_FREEZE_INITIATOR, &f),
116  		     test_bit(SDF_FROZEN, &f),
117  		     test_bit(SDF_WITHDRAWING, &f),
118  		     test_bit(SDF_WITHDRAW_IN_PROG, &f),
119  		     test_bit(SDF_REMOTE_WITHDRAW, &f),
120  		     test_bit(SDF_WITHDRAW_RECOVERY, &f),
121  		     test_bit(SDF_DEACTIVATING, &f),
122  		     sdp->sd_log_error,
123  		     rwsem_is_locked(&sdp->sd_log_flush_lock),
124  		     sdp->sd_log_num_revoke,
125  		     atomic_read(&sdp->sd_log_in_flight),
126  		     atomic_read(&sdp->sd_log_blks_needed),
127  		     atomic_read(&sdp->sd_log_blks_free),
128  		     sdp->sd_log_flush_head,
129  		     sdp->sd_log_flush_tail,
130  		     sdp->sd_log_blks_reserved,
131  		     atomic_read(&sdp->sd_log_revokes_available));
132  	return s;
133  }
134  
135  static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
136  {
137  	return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
138  }
139  
140  static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
141  {
142  	struct super_block *s = sdp->sd_vfs;
143  
144  	buf[0] = '\0';
145  	if (uuid_is_null(&s->s_uuid))
146  		return 0;
147  	return snprintf(buf, PAGE_SIZE, "%pUB\n", &s->s_uuid);
148  }
149  
150  static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
151  {
152  	struct super_block *sb = sdp->sd_vfs;
153  	int frozen = (sb->s_writers.frozen == SB_UNFROZEN) ? 0 : 1;
154  
155  	return snprintf(buf, PAGE_SIZE, "%d\n", frozen);
156  }
157  
158  static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
159  {
160  	int error, n;
161  
162  	error = kstrtoint(buf, 0, &n);
163  	if (error)
164  		return error;
165  
166  	if (!capable(CAP_SYS_ADMIN))
167  		return -EPERM;
168  
169  	switch (n) {
170  	case 0:
171  		error = thaw_super(sdp->sd_vfs);
172  		break;
173  	case 1:
174  		error = freeze_super(sdp->sd_vfs);
175  		break;
176  	default:
177  		return -EINVAL;
178  	}
179  
180  	if (error) {
181  		fs_warn(sdp, "freeze %d error %d\n", n, error);
182  		return error;
183  	}
184  
185  	return len;
186  }
187  
188  static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
189  {
190  	unsigned int b = gfs2_withdrawn(sdp);
191  	return snprintf(buf, PAGE_SIZE, "%u\n", b);
192  }
193  
194  static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
195  {
196  	int error, val;
197  
198  	if (!capable(CAP_SYS_ADMIN))
199  		return -EPERM;
200  
201  	error = kstrtoint(buf, 0, &val);
202  	if (error)
203  		return error;
204  
205  	if (val != 1)
206  		return -EINVAL;
207  
208  	gfs2_lm(sdp, "withdrawing from cluster at user's request\n");
209  	gfs2_withdraw(sdp);
210  
211  	return len;
212  }
213  
214  static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
215  				 size_t len)
216  {
217  	int error, val;
218  
219  	if (!capable(CAP_SYS_ADMIN))
220  		return -EPERM;
221  
222  	error = kstrtoint(buf, 0, &val);
223  	if (error)
224  		return error;
225  
226  	if (val != 1)
227  		return -EINVAL;
228  
229  	gfs2_statfs_sync(sdp->sd_vfs, 0);
230  	return len;
231  }
232  
233  static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
234  				size_t len)
235  {
236  	int error, val;
237  
238  	if (!capable(CAP_SYS_ADMIN))
239  		return -EPERM;
240  
241  	error = kstrtoint(buf, 0, &val);
242  	if (error)
243  		return error;
244  
245  	if (val != 1)
246  		return -EINVAL;
247  
248  	gfs2_quota_sync(sdp->sd_vfs, 0);
249  	return len;
250  }
251  
252  static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
253  					size_t len)
254  {
255  	struct kqid qid;
256  	int error;
257  	u32 id;
258  
259  	if (!capable(CAP_SYS_ADMIN))
260  		return -EPERM;
261  
262  	error = kstrtou32(buf, 0, &id);
263  	if (error)
264  		return error;
265  
266  	qid = make_kqid(current_user_ns(), USRQUOTA, id);
267  	if (!qid_valid(qid))
268  		return -EINVAL;
269  
270  	error = gfs2_quota_refresh(sdp, qid);
271  	return error ? error : len;
272  }
273  
274  static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
275  					 size_t len)
276  {
277  	struct kqid qid;
278  	int error;
279  	u32 id;
280  
281  	if (!capable(CAP_SYS_ADMIN))
282  		return -EPERM;
283  
284  	error = kstrtou32(buf, 0, &id);
285  	if (error)
286  		return error;
287  
288  	qid = make_kqid(current_user_ns(), GRPQUOTA, id);
289  	if (!qid_valid(qid))
290  		return -EINVAL;
291  
292  	error = gfs2_quota_refresh(sdp, qid);
293  	return error ? error : len;
294  }
295  
296  static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
297  {
298  	struct gfs2_glock *gl;
299  	const struct gfs2_glock_operations *glops;
300  	unsigned int glmode;
301  	unsigned int gltype;
302  	unsigned long long glnum;
303  	char mode[16];
304  	int rv;
305  
306  	if (!capable(CAP_SYS_ADMIN))
307  		return -EPERM;
308  
309  	rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
310  		    mode);
311  	if (rv != 3)
312  		return -EINVAL;
313  
314  	if (strcmp(mode, "EX") == 0)
315  		glmode = LM_ST_UNLOCKED;
316  	else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
317  		glmode = LM_ST_DEFERRED;
318  	else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
319  		glmode = LM_ST_SHARED;
320  	else
321  		return -EINVAL;
322  
323  	if (gltype > LM_TYPE_JOURNAL)
324  		return -EINVAL;
325  	if (gltype == LM_TYPE_NONDISK && glnum == GFS2_FREEZE_LOCK)
326  		glops = &gfs2_freeze_glops;
327  	else
328  		glops = gfs2_glops_list[gltype];
329  	if (glops == NULL)
330  		return -EINVAL;
331  	if (!test_and_set_bit(SDF_DEMOTE, &sdp->sd_flags))
332  		fs_info(sdp, "demote interface used\n");
333  	rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
334  	if (rv)
335  		return rv;
336  	gfs2_glock_cb(gl, glmode);
337  	gfs2_glock_put(gl);
338  	return len;
339  }
340  
341  
342  #define GFS2_ATTR(name, mode, show, store) \
343  static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
344  
345  GFS2_ATTR(id,                  0444, id_show,       NULL);
346  GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
347  GFS2_ATTR(uuid,                0444, uuid_show,     NULL);
348  GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
349  GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
350  GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
351  GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
352  GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
353  GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);
354  GFS2_ATTR(demote_rq,           0200, NULL,	    demote_rq_store);
355  GFS2_ATTR(status,              0400, status_show,   NULL);
356  
357  static struct attribute *gfs2_attrs[] = {
358  	&gfs2_attr_id.attr,
359  	&gfs2_attr_fsname.attr,
360  	&gfs2_attr_uuid.attr,
361  	&gfs2_attr_freeze.attr,
362  	&gfs2_attr_withdraw.attr,
363  	&gfs2_attr_statfs_sync.attr,
364  	&gfs2_attr_quota_sync.attr,
365  	&gfs2_attr_quota_refresh_user.attr,
366  	&gfs2_attr_quota_refresh_group.attr,
367  	&gfs2_attr_demote_rq.attr,
368  	&gfs2_attr_status.attr,
369  	NULL,
370  };
371  ATTRIBUTE_GROUPS(gfs2);
372  
373  static void gfs2_sbd_release(struct kobject *kobj)
374  {
375  	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
376  
377  	complete(&sdp->sd_kobj_unregister);
378  }
379  
380  static struct kobj_type gfs2_ktype = {
381  	.release = gfs2_sbd_release,
382  	.default_groups = gfs2_groups,
383  	.sysfs_ops     = &gfs2_attr_ops,
384  };
385  
386  
387  /*
388   * lock_module. Originally from lock_dlm
389   */
390  
391  static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
392  {
393  	const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
394  	return sprintf(buf, "%s\n", ops->lm_proto_name);
395  }
396  
397  static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
398  {
399  	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
400  	ssize_t ret;
401  	int val = 0;
402  
403  	if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags))
404  		val = 1;
405  	ret = sprintf(buf, "%d\n", val);
406  	return ret;
407  }
408  
409  static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
410  {
411  	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
412  	int ret, val;
413  
414  	ret = kstrtoint(buf, 0, &val);
415  	if (ret)
416  		return ret;
417  
418  	if (val == 1)
419  		set_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
420  	else if (val == 0) {
421  		clear_bit(DFL_BLOCK_LOCKS, &ls->ls_recover_flags);
422  		smp_mb__after_atomic();
423  		gfs2_glock_thaw(sdp);
424  	} else {
425  		return -EINVAL;
426  	}
427  	return len;
428  }
429  
430  static ssize_t wdack_show(struct gfs2_sbd *sdp, char *buf)
431  {
432  	int val = completion_done(&sdp->sd_wdack) ? 1 : 0;
433  
434  	return sprintf(buf, "%d\n", val);
435  }
436  
437  static ssize_t wdack_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
438  {
439  	int ret, val;
440  
441  	ret = kstrtoint(buf, 0, &val);
442  	if (ret)
443  		return ret;
444  
445  	if ((val == 1) &&
446  	    !strcmp(sdp->sd_lockstruct.ls_ops->lm_proto_name, "lock_dlm"))
447  		complete(&sdp->sd_wdack);
448  	else
449  		return -EINVAL;
450  	return len;
451  }
452  
453  static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
454  {
455  	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
456  	return sprintf(buf, "%d\n", ls->ls_first);
457  }
458  
459  static ssize_t lkfirst_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
460  {
461  	unsigned first;
462  	int rv;
463  
464  	rv = sscanf(buf, "%u", &first);
465  	if (rv != 1 || first > 1)
466  		return -EINVAL;
467  	rv = wait_for_completion_killable(&sdp->sd_locking_init);
468  	if (rv)
469  		return rv;
470  	spin_lock(&sdp->sd_jindex_spin);
471  	rv = -EBUSY;
472  	if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
473  		goto out;
474  	rv = -EINVAL;
475  	if (sdp->sd_args.ar_spectator)
476  		goto out;
477  	if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
478  		goto out;
479  	sdp->sd_lockstruct.ls_first = first;
480  	rv = 0;
481  out:
482          spin_unlock(&sdp->sd_jindex_spin);
483          return rv ? rv : len;
484  }
485  
486  static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
487  {
488  	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
489  	return sprintf(buf, "%d\n", !!test_bit(DFL_FIRST_MOUNT_DONE, &ls->ls_recover_flags));
490  }
491  
492  int gfs2_recover_set(struct gfs2_sbd *sdp, unsigned jid)
493  {
494  	struct gfs2_jdesc *jd;
495  	int rv;
496  
497  	/* Wait for our primary journal to be initialized */
498  	wait_for_completion(&sdp->sd_journal_ready);
499  
500  	spin_lock(&sdp->sd_jindex_spin);
501  	rv = -EBUSY;
502  	/**
503  	 * If we're a spectator, we use journal0, but it's not really ours.
504  	 * So we need to wait for its recovery too. If we skip it we'd never
505  	 * queue work to the recovery workqueue, and so its completion would
506  	 * never clear the DFL_BLOCK_LOCKS flag, so all our locks would
507  	 * permanently stop working.
508  	 */
509  	if (!sdp->sd_jdesc)
510  		goto out;
511  	if (sdp->sd_jdesc->jd_jid == jid && !sdp->sd_args.ar_spectator)
512  		goto out;
513  	rv = -ENOENT;
514  	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
515  		if (jd->jd_jid != jid && !sdp->sd_args.ar_spectator)
516  			continue;
517  		rv = gfs2_recover_journal(jd, false);
518  		break;
519  	}
520  out:
521  	spin_unlock(&sdp->sd_jindex_spin);
522  	return rv;
523  }
524  
525  static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
526  {
527  	unsigned jid;
528  	int rv;
529  
530  	rv = sscanf(buf, "%u", &jid);
531  	if (rv != 1)
532  		return -EINVAL;
533  
534  	if (test_bit(SDF_NORECOVERY, &sdp->sd_flags)) {
535  		rv = -ESHUTDOWN;
536  		goto out;
537  	}
538  
539  	rv = gfs2_recover_set(sdp, jid);
540  out:
541  	return rv ? rv : len;
542  }
543  
544  static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
545  {
546  	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
547  	return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
548  }
549  
550  static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
551  {
552  	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
553  	return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
554  }
555  
556  static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
557  {
558  	return sprintf(buf, "%d\n", sdp->sd_lockstruct.ls_jid);
559  }
560  
561  static ssize_t jid_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
562  {
563          int jid;
564  	int rv;
565  
566  	rv = sscanf(buf, "%d", &jid);
567  	if (rv != 1)
568  		return -EINVAL;
569  	rv = wait_for_completion_killable(&sdp->sd_locking_init);
570  	if (rv)
571  		return rv;
572  	spin_lock(&sdp->sd_jindex_spin);
573  	rv = -EINVAL;
574  	if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
575  		goto out;
576  	rv = -EBUSY;
577  	if (test_bit(SDF_NOJOURNALID, &sdp->sd_flags) == 0)
578  		goto out;
579  	rv = 0;
580  	if (sdp->sd_args.ar_spectator && jid > 0)
581  		rv = jid = -EINVAL;
582  	sdp->sd_lockstruct.ls_jid = jid;
583  	clear_bit(SDF_NOJOURNALID, &sdp->sd_flags);
584  	smp_mb__after_atomic();
585  	wake_up_bit(&sdp->sd_flags, SDF_NOJOURNALID);
586  out:
587  	spin_unlock(&sdp->sd_jindex_spin);
588  	return rv ? rv : len;
589  }
590  
591  #define GDLM_ATTR(_name,_mode,_show,_store) \
592  static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
593  
594  GDLM_ATTR(proto_name,		0444, proto_name_show,		NULL);
595  GDLM_ATTR(block,		0644, block_show,		block_store);
596  GDLM_ATTR(withdraw,		0644, wdack_show,		wdack_store);
597  GDLM_ATTR(jid,			0644, jid_show,			jid_store);
598  GDLM_ATTR(first,		0644, lkfirst_show,		lkfirst_store);
599  GDLM_ATTR(first_done,		0444, first_done_show,		NULL);
600  GDLM_ATTR(recover,		0600, NULL,			recover_store);
601  GDLM_ATTR(recover_done,		0444, recover_done_show,	NULL);
602  GDLM_ATTR(recover_status,	0444, recover_status_show,	NULL);
603  
604  static struct attribute *lock_module_attrs[] = {
605  	&gdlm_attr_proto_name.attr,
606  	&gdlm_attr_block.attr,
607  	&gdlm_attr_withdraw.attr,
608  	&gdlm_attr_jid.attr,
609  	&gdlm_attr_first.attr,
610  	&gdlm_attr_first_done.attr,
611  	&gdlm_attr_recover.attr,
612  	&gdlm_attr_recover_done.attr,
613  	&gdlm_attr_recover_status.attr,
614  	NULL,
615  };
616  
617  /*
618   * get and set struct gfs2_tune fields
619   */
620  
621  static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
622  {
623  	return snprintf(buf, PAGE_SIZE, "%u %u\n",
624  			sdp->sd_tune.gt_quota_scale_num,
625  			sdp->sd_tune.gt_quota_scale_den);
626  }
627  
628  static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
629  				 size_t len)
630  {
631  	struct gfs2_tune *gt = &sdp->sd_tune;
632  	unsigned int x, y;
633  
634  	if (!capable(CAP_SYS_ADMIN))
635  		return -EPERM;
636  
637  	if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
638  		return -EINVAL;
639  
640  	spin_lock(&gt->gt_spin);
641  	gt->gt_quota_scale_num = x;
642  	gt->gt_quota_scale_den = y;
643  	spin_unlock(&gt->gt_spin);
644  	return len;
645  }
646  
647  static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
648  			int check_zero, const char *buf, size_t len)
649  {
650  	struct gfs2_tune *gt = &sdp->sd_tune;
651  	unsigned int x;
652  	int error;
653  
654  	if (!capable(CAP_SYS_ADMIN))
655  		return -EPERM;
656  
657  	error = kstrtouint(buf, 0, &x);
658  	if (error)
659  		return error;
660  
661  	if (check_zero && !x)
662  		return -EINVAL;
663  
664  	spin_lock(&gt->gt_spin);
665  	*field = x;
666  	spin_unlock(&gt->gt_spin);
667  	return len;
668  }
669  
670  #define TUNE_ATTR_3(name, show, store)                                        \
671  static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
672  
673  #define TUNE_ATTR_2(name, store)                                              \
674  static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
675  {                                                                             \
676  	return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
677  }                                                                             \
678  TUNE_ATTR_3(name, name##_show, store)
679  
680  #define TUNE_ATTR(name, check_zero)                                           \
681  static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
682  {                                                                             \
683  	return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
684  }                                                                             \
685  TUNE_ATTR_2(name, name##_store)
686  
687  TUNE_ATTR(quota_warn_period, 0);
688  TUNE_ATTR(quota_quantum, 0);
689  TUNE_ATTR(max_readahead, 0);
690  TUNE_ATTR(complain_secs, 0);
691  TUNE_ATTR(statfs_slow, 0);
692  TUNE_ATTR(new_files_jdata, 0);
693  TUNE_ATTR(statfs_quantum, 1);
694  TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
695  
696  static struct attribute *tune_attrs[] = {
697  	&tune_attr_quota_warn_period.attr,
698  	&tune_attr_quota_quantum.attr,
699  	&tune_attr_max_readahead.attr,
700  	&tune_attr_complain_secs.attr,
701  	&tune_attr_statfs_slow.attr,
702  	&tune_attr_statfs_quantum.attr,
703  	&tune_attr_quota_scale.attr,
704  	&tune_attr_new_files_jdata.attr,
705  	NULL,
706  };
707  
708  static const struct attribute_group tune_group = {
709  	.name = "tune",
710  	.attrs = tune_attrs,
711  };
712  
713  static const struct attribute_group lock_module_group = {
714  	.name = "lock_module",
715  	.attrs = lock_module_attrs,
716  };
717  
718  int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
719  {
720  	struct super_block *sb = sdp->sd_vfs;
721  	int error;
722  	char ro[20];
723  	char spectator[20];
724  	char *envp[] = { ro, spectator, NULL };
725  
726  	sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
727  	sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
728  
729  	init_completion(&sdp->sd_kobj_unregister);
730  	sdp->sd_kobj.kset = gfs2_kset;
731  	error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
732  				     "%s", sdp->sd_table_name);
733  	if (error)
734  		goto fail_reg;
735  
736  	error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
737  	if (error)
738  		goto fail_reg;
739  
740  	error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
741  	if (error)
742  		goto fail_tune;
743  
744  	error = sysfs_create_link(&sdp->sd_kobj,
745  				  &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
746  				  "device");
747  	if (error)
748  		goto fail_lock_module;
749  
750  	kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
751  	return 0;
752  
753  fail_lock_module:
754  	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
755  fail_tune:
756  	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
757  fail_reg:
758  	fs_err(sdp, "error %d adding sysfs files\n", error);
759  	kobject_put(&sdp->sd_kobj);
760  	wait_for_completion(&sdp->sd_kobj_unregister);
761  	sb->s_fs_info = NULL;
762  	return error;
763  }
764  
765  void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
766  {
767  	sysfs_remove_link(&sdp->sd_kobj, "device");
768  	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
769  	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
770  	kobject_put(&sdp->sd_kobj);
771  	wait_for_completion(&sdp->sd_kobj_unregister);
772  }
773  
774  static int gfs2_uevent(const struct kobject *kobj, struct kobj_uevent_env *env)
775  {
776  	const struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
777  	const struct super_block *s = sdp->sd_vfs;
778  
779  	add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
780  	add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
781  	if (!test_bit(SDF_NOJOURNALID, &sdp->sd_flags))
782  		add_uevent_var(env, "JOURNALID=%d", sdp->sd_lockstruct.ls_jid);
783  	if (!uuid_is_null(&s->s_uuid))
784  		add_uevent_var(env, "UUID=%pUB", &s->s_uuid);
785  	return 0;
786  }
787  
788  static const struct kset_uevent_ops gfs2_uevent_ops = {
789  	.uevent = gfs2_uevent,
790  };
791  
792  int gfs2_sys_init(void)
793  {
794  	gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
795  	if (!gfs2_kset)
796  		return -ENOMEM;
797  	return 0;
798  }
799  
800  void gfs2_sys_uninit(void)
801  {
802  	kset_unregister(gfs2_kset);
803  }
804  
805