Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm...
[~shefty/rdma-dev.git] / fs / gfs2 / quota.c
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 /*
11  * Quota change tags are associated with each transaction that allocates or
12  * deallocates space.  Those changes are accumulated locally to each node (in a
13  * per-node file) and then are periodically synced to the quota file.  This
14  * avoids the bottleneck of constantly touching the quota file, but introduces
15  * fuzziness in the current usage value of IDs that are being used on different
16  * nodes in the cluster simultaneously.  So, it is possible for a user on
17  * multiple nodes to overrun their quota, but that overrun is controlable.
18  * Since quota tags are part of transactions, there is no need for a quota check
19  * program to be run on node crashes or anything like that.
20  *
21  * There are couple of knobs that let the administrator manage the quota
22  * fuzziness.  "quota_quantum" sets the maximum time a quota change can be
23  * sitting on one node before being synced to the quota file.  (The default is
24  * 60 seconds.)  Another knob, "quota_scale" controls how quickly the frequency
25  * of quota file syncs increases as the user moves closer to their limit.  The
26  * more frequent the syncs, the more accurate the quota enforcement, but that
27  * means that there is more contention between the nodes for the quota file.
28  * The default value is one.  This sets the maximum theoretical quota overrun
29  * (with infinite node with infinite bandwidth) to twice the user's limit.  (In
30  * practice, the maximum overrun you see should be much less.)  A "quota_scale"
31  * number greater than one makes quota syncs more frequent and reduces the
32  * maximum overrun.  Numbers less than one (but greater than zero) make quota
33  * syncs less frequent.
34  *
35  * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
36  * the quota file, so it is not being constantly read.
37  */
38
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/mm.h>
42 #include <linux/spinlock.h>
43 #include <linux/completion.h>
44 #include <linux/buffer_head.h>
45 #include <linux/sort.h>
46 #include <linux/fs.h>
47 #include <linux/bio.h>
48 #include <linux/gfs2_ondisk.h>
49 #include <linux/kthread.h>
50 #include <linux/freezer.h>
51 #include <linux/quota.h>
52 #include <linux/dqblk_xfs.h>
53
54 #include "gfs2.h"
55 #include "incore.h"
56 #include "bmap.h"
57 #include "glock.h"
58 #include "glops.h"
59 #include "log.h"
60 #include "meta_io.h"
61 #include "quota.h"
62 #include "rgrp.h"
63 #include "super.h"
64 #include "trans.h"
65 #include "inode.h"
66 #include "util.h"
67
68 struct gfs2_quota_change_host {
69         u64 qc_change;
70         u32 qc_flags; /* GFS2_QCF_... */
71         struct kqid qc_id;
72 };
73
74 static LIST_HEAD(qd_lru_list);
75 static atomic_t qd_lru_count = ATOMIC_INIT(0);
76 static DEFINE_SPINLOCK(qd_lru_lock);
77
78 int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc)
79 {
80         struct gfs2_quota_data *qd;
81         struct gfs2_sbd *sdp;
82         int nr_to_scan = sc->nr_to_scan;
83
84         if (nr_to_scan == 0)
85                 goto out;
86
87         if (!(sc->gfp_mask & __GFP_FS))
88                 return -1;
89
90         spin_lock(&qd_lru_lock);
91         while (nr_to_scan && !list_empty(&qd_lru_list)) {
92                 qd = list_entry(qd_lru_list.next,
93                                 struct gfs2_quota_data, qd_reclaim);
94                 sdp = qd->qd_gl->gl_sbd;
95
96                 /* Free from the filesystem-specific list */
97                 list_del(&qd->qd_list);
98
99                 gfs2_assert_warn(sdp, !qd->qd_change);
100                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
101                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
102
103                 gfs2_glock_put(qd->qd_gl);
104                 atomic_dec(&sdp->sd_quota_count);
105
106                 /* Delete it from the common reclaim list */
107                 list_del_init(&qd->qd_reclaim);
108                 atomic_dec(&qd_lru_count);
109                 spin_unlock(&qd_lru_lock);
110                 kmem_cache_free(gfs2_quotad_cachep, qd);
111                 spin_lock(&qd_lru_lock);
112                 nr_to_scan--;
113         }
114         spin_unlock(&qd_lru_lock);
115
116 out:
117         return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
118 }
119
120 static u64 qd2index(struct gfs2_quota_data *qd)
121 {
122         struct kqid qid = qd->qd_id;
123         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
124                 (qid.type == USRQUOTA) ? 0 : 1;
125 }
126
127 static u64 qd2offset(struct gfs2_quota_data *qd)
128 {
129         u64 offset;
130
131         offset = qd2index(qd);
132         offset *= sizeof(struct gfs2_quota);
133
134         return offset;
135 }
136
137 static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid,
138                     struct gfs2_quota_data **qdp)
139 {
140         struct gfs2_quota_data *qd;
141         int error;
142
143         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
144         if (!qd)
145                 return -ENOMEM;
146
147         atomic_set(&qd->qd_count, 1);
148         qd->qd_id = qid;
149         qd->qd_slot = -1;
150         INIT_LIST_HEAD(&qd->qd_reclaim);
151
152         error = gfs2_glock_get(sdp, qd2index(qd),
153                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
154         if (error)
155                 goto fail;
156
157         *qdp = qd;
158
159         return 0;
160
161 fail:
162         kmem_cache_free(gfs2_quotad_cachep, qd);
163         return error;
164 }
165
166 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
167                   struct gfs2_quota_data **qdp)
168 {
169         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
170         int error, found;
171
172         *qdp = NULL;
173
174         for (;;) {
175                 found = 0;
176                 spin_lock(&qd_lru_lock);
177                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
178                         if (qid_eq(qd->qd_id, qid)) {
179                                 if (!atomic_read(&qd->qd_count) &&
180                                     !list_empty(&qd->qd_reclaim)) {
181                                         /* Remove it from reclaim list */
182                                         list_del_init(&qd->qd_reclaim);
183                                         atomic_dec(&qd_lru_count);
184                                 }
185                                 atomic_inc(&qd->qd_count);
186                                 found = 1;
187                                 break;
188                         }
189                 }
190
191                 if (!found)
192                         qd = NULL;
193
194                 if (!qd && new_qd) {
195                         qd = new_qd;
196                         list_add(&qd->qd_list, &sdp->sd_quota_list);
197                         atomic_inc(&sdp->sd_quota_count);
198                         new_qd = NULL;
199                 }
200
201                 spin_unlock(&qd_lru_lock);
202
203                 if (qd) {
204                         if (new_qd) {
205                                 gfs2_glock_put(new_qd->qd_gl);
206                                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
207                         }
208                         *qdp = qd;
209                         return 0;
210                 }
211
212                 error = qd_alloc(sdp, qid, &new_qd);
213                 if (error)
214                         return error;
215         }
216 }
217
218 static void qd_hold(struct gfs2_quota_data *qd)
219 {
220         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
221         gfs2_assert(sdp, atomic_read(&qd->qd_count));
222         atomic_inc(&qd->qd_count);
223 }
224
225 static void qd_put(struct gfs2_quota_data *qd)
226 {
227         if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
228                 /* Add to the reclaim list */
229                 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
230                 atomic_inc(&qd_lru_count);
231                 spin_unlock(&qd_lru_lock);
232         }
233 }
234
235 static int slot_get(struct gfs2_quota_data *qd)
236 {
237         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
238         unsigned int c, o = 0, b;
239         unsigned char byte = 0;
240
241         spin_lock(&qd_lru_lock);
242
243         if (qd->qd_slot_count++) {
244                 spin_unlock(&qd_lru_lock);
245                 return 0;
246         }
247
248         for (c = 0; c < sdp->sd_quota_chunks; c++)
249                 for (o = 0; o < PAGE_SIZE; o++) {
250                         byte = sdp->sd_quota_bitmap[c][o];
251                         if (byte != 0xFF)
252                                 goto found;
253                 }
254
255         goto fail;
256
257 found:
258         for (b = 0; b < 8; b++)
259                 if (!(byte & (1 << b)))
260                         break;
261         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
262
263         if (qd->qd_slot >= sdp->sd_quota_slots)
264                 goto fail;
265
266         sdp->sd_quota_bitmap[c][o] |= 1 << b;
267
268         spin_unlock(&qd_lru_lock);
269
270         return 0;
271
272 fail:
273         qd->qd_slot_count--;
274         spin_unlock(&qd_lru_lock);
275         return -ENOSPC;
276 }
277
278 static void slot_hold(struct gfs2_quota_data *qd)
279 {
280         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
281
282         spin_lock(&qd_lru_lock);
283         gfs2_assert(sdp, qd->qd_slot_count);
284         qd->qd_slot_count++;
285         spin_unlock(&qd_lru_lock);
286 }
287
288 static void slot_put(struct gfs2_quota_data *qd)
289 {
290         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
291
292         spin_lock(&qd_lru_lock);
293         gfs2_assert(sdp, qd->qd_slot_count);
294         if (!--qd->qd_slot_count) {
295                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
296                 qd->qd_slot = -1;
297         }
298         spin_unlock(&qd_lru_lock);
299 }
300
301 static int bh_get(struct gfs2_quota_data *qd)
302 {
303         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
304         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
305         unsigned int block, offset;
306         struct buffer_head *bh;
307         int error;
308         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
309
310         mutex_lock(&sdp->sd_quota_mutex);
311
312         if (qd->qd_bh_count++) {
313                 mutex_unlock(&sdp->sd_quota_mutex);
314                 return 0;
315         }
316
317         block = qd->qd_slot / sdp->sd_qc_per_block;
318         offset = qd->qd_slot % sdp->sd_qc_per_block;
319
320         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
321         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
322         if (error)
323                 goto fail;
324         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
325         if (error)
326                 goto fail;
327         error = -EIO;
328         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
329                 goto fail_brelse;
330
331         qd->qd_bh = bh;
332         qd->qd_bh_qc = (struct gfs2_quota_change *)
333                 (bh->b_data + sizeof(struct gfs2_meta_header) +
334                  offset * sizeof(struct gfs2_quota_change));
335
336         mutex_unlock(&sdp->sd_quota_mutex);
337
338         return 0;
339
340 fail_brelse:
341         brelse(bh);
342 fail:
343         qd->qd_bh_count--;
344         mutex_unlock(&sdp->sd_quota_mutex);
345         return error;
346 }
347
348 static void bh_put(struct gfs2_quota_data *qd)
349 {
350         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
351
352         mutex_lock(&sdp->sd_quota_mutex);
353         gfs2_assert(sdp, qd->qd_bh_count);
354         if (!--qd->qd_bh_count) {
355                 brelse(qd->qd_bh);
356                 qd->qd_bh = NULL;
357                 qd->qd_bh_qc = NULL;
358         }
359         mutex_unlock(&sdp->sd_quota_mutex);
360 }
361
362 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
363 {
364         struct gfs2_quota_data *qd = NULL;
365         int error;
366         int found = 0;
367
368         *qdp = NULL;
369
370         if (sdp->sd_vfs->s_flags & MS_RDONLY)
371                 return 0;
372
373         spin_lock(&qd_lru_lock);
374
375         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
376                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
377                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
378                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
379                         continue;
380
381                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
382
383                 set_bit(QDF_LOCKED, &qd->qd_flags);
384                 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
385                 atomic_inc(&qd->qd_count);
386                 qd->qd_change_sync = qd->qd_change;
387                 gfs2_assert_warn(sdp, qd->qd_slot_count);
388                 qd->qd_slot_count++;
389                 found = 1;
390
391                 break;
392         }
393
394         if (!found)
395                 qd = NULL;
396
397         spin_unlock(&qd_lru_lock);
398
399         if (qd) {
400                 gfs2_assert_warn(sdp, qd->qd_change_sync);
401                 error = bh_get(qd);
402                 if (error) {
403                         clear_bit(QDF_LOCKED, &qd->qd_flags);
404                         slot_put(qd);
405                         qd_put(qd);
406                         return error;
407                 }
408         }
409
410         *qdp = qd;
411
412         return 0;
413 }
414
415 static int qd_trylock(struct gfs2_quota_data *qd)
416 {
417         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
418
419         if (sdp->sd_vfs->s_flags & MS_RDONLY)
420                 return 0;
421
422         spin_lock(&qd_lru_lock);
423
424         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
425             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
426                 spin_unlock(&qd_lru_lock);
427                 return 0;
428         }
429
430         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
431
432         set_bit(QDF_LOCKED, &qd->qd_flags);
433         gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
434         atomic_inc(&qd->qd_count);
435         qd->qd_change_sync = qd->qd_change;
436         gfs2_assert_warn(sdp, qd->qd_slot_count);
437         qd->qd_slot_count++;
438
439         spin_unlock(&qd_lru_lock);
440
441         gfs2_assert_warn(sdp, qd->qd_change_sync);
442         if (bh_get(qd)) {
443                 clear_bit(QDF_LOCKED, &qd->qd_flags);
444                 slot_put(qd);
445                 qd_put(qd);
446                 return 0;
447         }
448
449         return 1;
450 }
451
452 static void qd_unlock(struct gfs2_quota_data *qd)
453 {
454         gfs2_assert_warn(qd->qd_gl->gl_sbd,
455                          test_bit(QDF_LOCKED, &qd->qd_flags));
456         clear_bit(QDF_LOCKED, &qd->qd_flags);
457         bh_put(qd);
458         slot_put(qd);
459         qd_put(qd);
460 }
461
462 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
463                     struct gfs2_quota_data **qdp)
464 {
465         int error;
466
467         error = qd_get(sdp, qid, qdp);
468         if (error)
469                 return error;
470
471         error = slot_get(*qdp);
472         if (error)
473                 goto fail;
474
475         error = bh_get(*qdp);
476         if (error)
477                 goto fail_slot;
478
479         return 0;
480
481 fail_slot:
482         slot_put(*qdp);
483 fail:
484         qd_put(*qdp);
485         return error;
486 }
487
488 static void qdsb_put(struct gfs2_quota_data *qd)
489 {
490         bh_put(qd);
491         slot_put(qd);
492         qd_put(qd);
493 }
494
495 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
496 {
497         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
498         struct gfs2_quota_data **qd;
499         int error;
500
501         if (ip->i_res == NULL) {
502                 error = gfs2_rs_alloc(ip);
503                 if (error)
504                         return error;
505         }
506
507         qd = ip->i_res->rs_qa_qd;
508
509         if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
510             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
511                 return -EIO;
512
513         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
514                 return 0;
515
516         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
517         if (error)
518                 goto out;
519         ip->i_res->rs_qa_qd_num++;
520         qd++;
521
522         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
523         if (error)
524                 goto out;
525         ip->i_res->rs_qa_qd_num++;
526         qd++;
527
528         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
529             !uid_eq(uid, ip->i_inode.i_uid)) {
530                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
531                 if (error)
532                         goto out;
533                 ip->i_res->rs_qa_qd_num++;
534                 qd++;
535         }
536
537         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
538             !gid_eq(gid, ip->i_inode.i_gid)) {
539                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
540                 if (error)
541                         goto out;
542                 ip->i_res->rs_qa_qd_num++;
543                 qd++;
544         }
545
546 out:
547         if (error)
548                 gfs2_quota_unhold(ip);
549         return error;
550 }
551
552 void gfs2_quota_unhold(struct gfs2_inode *ip)
553 {
554         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
555         unsigned int x;
556
557         if (ip->i_res == NULL)
558                 return;
559         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
560
561         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
562                 qdsb_put(ip->i_res->rs_qa_qd[x]);
563                 ip->i_res->rs_qa_qd[x] = NULL;
564         }
565         ip->i_res->rs_qa_qd_num = 0;
566 }
567
568 static int sort_qd(const void *a, const void *b)
569 {
570         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
571         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
572
573         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
574                 return -1;
575         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
576                 return 1;
577         return 0;
578 }
579
580 static void do_qc(struct gfs2_quota_data *qd, s64 change)
581 {
582         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
583         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
584         struct gfs2_quota_change *qc = qd->qd_bh_qc;
585         s64 x;
586
587         mutex_lock(&sdp->sd_quota_mutex);
588         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
589
590         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
591                 qc->qc_change = 0;
592                 qc->qc_flags = 0;
593                 if (qd->qd_id.type == USRQUOTA)
594                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
595                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
596         }
597
598         x = be64_to_cpu(qc->qc_change) + change;
599         qc->qc_change = cpu_to_be64(x);
600
601         spin_lock(&qd_lru_lock);
602         qd->qd_change = x;
603         spin_unlock(&qd_lru_lock);
604
605         if (!x) {
606                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
607                 clear_bit(QDF_CHANGE, &qd->qd_flags);
608                 qc->qc_flags = 0;
609                 qc->qc_id = 0;
610                 slot_put(qd);
611                 qd_put(qd);
612         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
613                 qd_hold(qd);
614                 slot_hold(qd);
615         }
616
617         mutex_unlock(&sdp->sd_quota_mutex);
618 }
619
620 /**
621  * gfs2_adjust_quota - adjust record of current block usage
622  * @ip: The quota inode
623  * @loc: Offset of the entry in the quota file
624  * @change: The amount of usage change to record
625  * @qd: The quota data
626  * @fdq: The updated limits to record
627  *
628  * This function was mostly borrowed from gfs2_block_truncate_page which was
629  * in turn mostly borrowed from ext3
630  *
631  * Returns: 0 or -ve on error
632  */
633
634 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
635                              s64 change, struct gfs2_quota_data *qd,
636                              struct fs_disk_quota *fdq)
637 {
638         struct inode *inode = &ip->i_inode;
639         struct gfs2_sbd *sdp = GFS2_SB(inode);
640         struct address_space *mapping = inode->i_mapping;
641         unsigned long index = loc >> PAGE_CACHE_SHIFT;
642         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
643         unsigned blocksize, iblock, pos;
644         struct buffer_head *bh;
645         struct page *page;
646         void *kaddr, *ptr;
647         struct gfs2_quota q, *qp;
648         int err, nbytes;
649         u64 size;
650
651         if (gfs2_is_stuffed(ip)) {
652                 err = gfs2_unstuff_dinode(ip, NULL);
653                 if (err)
654                         return err;
655         }
656
657         memset(&q, 0, sizeof(struct gfs2_quota));
658         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
659         if (err < 0)
660                 return err;
661
662         err = -EIO;
663         qp = &q;
664         qp->qu_value = be64_to_cpu(qp->qu_value);
665         qp->qu_value += change;
666         qp->qu_value = cpu_to_be64(qp->qu_value);
667         qd->qd_qb.qb_value = qp->qu_value;
668         if (fdq) {
669                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
670                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
671                         qd->qd_qb.qb_warn = qp->qu_warn;
672                 }
673                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
674                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
675                         qd->qd_qb.qb_limit = qp->qu_limit;
676                 }
677                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
678                         qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
679                         qd->qd_qb.qb_value = qp->qu_value;
680                 }
681         }
682
683         /* Write the quota into the quota file on disk */
684         ptr = qp;
685         nbytes = sizeof(struct gfs2_quota);
686 get_a_page:
687         page = find_or_create_page(mapping, index, GFP_NOFS);
688         if (!page)
689                 return -ENOMEM;
690
691         blocksize = inode->i_sb->s_blocksize;
692         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
693
694         if (!page_has_buffers(page))
695                 create_empty_buffers(page, blocksize, 0);
696
697         bh = page_buffers(page);
698         pos = blocksize;
699         while (offset >= pos) {
700                 bh = bh->b_this_page;
701                 iblock++;
702                 pos += blocksize;
703         }
704
705         if (!buffer_mapped(bh)) {
706                 gfs2_block_map(inode, iblock, bh, 1);
707                 if (!buffer_mapped(bh))
708                         goto unlock_out;
709                 /* If it's a newly allocated disk block for quota, zero it */
710                 if (buffer_new(bh))
711                         zero_user(page, pos - blocksize, bh->b_size);
712         }
713
714         if (PageUptodate(page))
715                 set_buffer_uptodate(bh);
716
717         if (!buffer_uptodate(bh)) {
718                 ll_rw_block(READ | REQ_META, 1, &bh);
719                 wait_on_buffer(bh);
720                 if (!buffer_uptodate(bh))
721                         goto unlock_out;
722         }
723
724         gfs2_trans_add_meta(ip->i_gl, bh);
725
726         kaddr = kmap_atomic(page);
727         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
728                 nbytes = PAGE_CACHE_SIZE - offset;
729         memcpy(kaddr + offset, ptr, nbytes);
730         flush_dcache_page(page);
731         kunmap_atomic(kaddr);
732         unlock_page(page);
733         page_cache_release(page);
734
735         /* If quota straddles page boundary, we need to update the rest of the
736          * quota at the beginning of the next page */
737         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
738                 ptr = ptr + nbytes;
739                 nbytes = sizeof(struct gfs2_quota) - nbytes;
740                 offset = 0;
741                 index++;
742                 goto get_a_page;
743         }
744
745         size = loc + sizeof(struct gfs2_quota);
746         if (size > inode->i_size)
747                 i_size_write(inode, size);
748         inode->i_mtime = inode->i_atime = CURRENT_TIME;
749         mark_inode_dirty(inode);
750         return 0;
751
752 unlock_out:
753         unlock_page(page);
754         page_cache_release(page);
755         return err;
756 }
757
758 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
759 {
760         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
761         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
762         unsigned int data_blocks, ind_blocks;
763         struct gfs2_holder *ghs, i_gh;
764         unsigned int qx, x;
765         struct gfs2_quota_data *qd;
766         unsigned reserved;
767         loff_t offset;
768         unsigned int nalloc = 0, blocks;
769         int error;
770
771         error = gfs2_rs_alloc(ip);
772         if (error)
773                 return error;
774
775         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
776                               &data_blocks, &ind_blocks);
777
778         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
779         if (!ghs)
780                 return -ENOMEM;
781
782         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
783         mutex_lock(&ip->i_inode.i_mutex);
784         for (qx = 0; qx < num_qd; qx++) {
785                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
786                                            GL_NOCACHE, &ghs[qx]);
787                 if (error)
788                         goto out;
789         }
790
791         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
792         if (error)
793                 goto out;
794
795         for (x = 0; x < num_qd; x++) {
796                 offset = qd2offset(qda[x]);
797                 if (gfs2_write_alloc_required(ip, offset,
798                                               sizeof(struct gfs2_quota)))
799                         nalloc++;
800         }
801
802         /* 
803          * 1 blk for unstuffing inode if stuffed. We add this extra
804          * block to the reservation unconditionally. If the inode
805          * doesn't need unstuffing, the block will be released to the 
806          * rgrp since it won't be allocated during the transaction
807          */
808         /* +3 in the end for unstuffing block, inode size update block
809          * and another block in case quota straddles page boundary and 
810          * two blocks need to be updated instead of 1 */
811         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
812
813         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
814         error = gfs2_inplace_reserve(ip, reserved, 0);
815         if (error)
816                 goto out_alloc;
817
818         if (nalloc)
819                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
820
821         error = gfs2_trans_begin(sdp, blocks, 0);
822         if (error)
823                 goto out_ipres;
824
825         for (x = 0; x < num_qd; x++) {
826                 qd = qda[x];
827                 offset = qd2offset(qd);
828                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
829                 if (error)
830                         goto out_end_trans;
831
832                 do_qc(qd, -qd->qd_change_sync);
833                 set_bit(QDF_REFRESH, &qd->qd_flags);
834         }
835
836         error = 0;
837
838 out_end_trans:
839         gfs2_trans_end(sdp);
840 out_ipres:
841         gfs2_inplace_release(ip);
842 out_alloc:
843         gfs2_glock_dq_uninit(&i_gh);
844 out:
845         while (qx--)
846                 gfs2_glock_dq_uninit(&ghs[qx]);
847         mutex_unlock(&ip->i_inode.i_mutex);
848         kfree(ghs);
849         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
850         return error;
851 }
852
853 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
854 {
855         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
856         struct gfs2_quota q;
857         struct gfs2_quota_lvb *qlvb;
858         loff_t pos;
859         int error;
860
861         memset(&q, 0, sizeof(struct gfs2_quota));
862         pos = qd2offset(qd);
863         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
864         if (error < 0)
865                 return error;
866
867         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
868         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
869         qlvb->__pad = 0;
870         qlvb->qb_limit = q.qu_limit;
871         qlvb->qb_warn = q.qu_warn;
872         qlvb->qb_value = q.qu_value;
873         qd->qd_qb = *qlvb;
874
875         return 0;
876 }
877
878 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
879                     struct gfs2_holder *q_gh)
880 {
881         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
882         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
883         struct gfs2_holder i_gh;
884         int error;
885
886 restart:
887         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
888         if (error)
889                 return error;
890
891         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
892
893         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
894                 gfs2_glock_dq_uninit(q_gh);
895                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
896                                            GL_NOCACHE, q_gh);
897                 if (error)
898                         return error;
899
900                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
901                 if (error)
902                         goto fail;
903
904                 error = update_qd(sdp, qd);
905                 if (error)
906                         goto fail_gunlock;
907
908                 gfs2_glock_dq_uninit(&i_gh);
909                 gfs2_glock_dq_uninit(q_gh);
910                 force_refresh = 0;
911                 goto restart;
912         }
913
914         return 0;
915
916 fail_gunlock:
917         gfs2_glock_dq_uninit(&i_gh);
918 fail:
919         gfs2_glock_dq_uninit(q_gh);
920         return error;
921 }
922
923 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
924 {
925         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
926         struct gfs2_quota_data *qd;
927         unsigned int x;
928         int error = 0;
929
930         error = gfs2_quota_hold(ip, uid, gid);
931         if (error)
932                 return error;
933
934         if (capable(CAP_SYS_RESOURCE) ||
935             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
936                 return 0;
937
938         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
939              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
940
941         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
942                 int force = NO_FORCE;
943                 qd = ip->i_res->rs_qa_qd[x];
944                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
945                         force = FORCE;
946                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
947                 if (error)
948                         break;
949         }
950
951         if (!error)
952                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
953         else {
954                 while (x--)
955                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
956                 gfs2_quota_unhold(ip);
957         }
958
959         return error;
960 }
961
962 static int need_sync(struct gfs2_quota_data *qd)
963 {
964         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
965         struct gfs2_tune *gt = &sdp->sd_tune;
966         s64 value;
967         unsigned int num, den;
968         int do_sync = 1;
969
970         if (!qd->qd_qb.qb_limit)
971                 return 0;
972
973         spin_lock(&qd_lru_lock);
974         value = qd->qd_change;
975         spin_unlock(&qd_lru_lock);
976
977         spin_lock(&gt->gt_spin);
978         num = gt->gt_quota_scale_num;
979         den = gt->gt_quota_scale_den;
980         spin_unlock(&gt->gt_spin);
981
982         if (value < 0)
983                 do_sync = 0;
984         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
985                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
986                 do_sync = 0;
987         else {
988                 value *= gfs2_jindex_size(sdp) * num;
989                 value = div_s64(value, den);
990                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
991                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
992                         do_sync = 0;
993         }
994
995         return do_sync;
996 }
997
998 void gfs2_quota_unlock(struct gfs2_inode *ip)
999 {
1000         struct gfs2_quota_data *qda[4];
1001         unsigned int count = 0;
1002         unsigned int x;
1003
1004         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1005                 goto out;
1006
1007         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1008                 struct gfs2_quota_data *qd;
1009                 int sync;
1010
1011                 qd = ip->i_res->rs_qa_qd[x];
1012                 sync = need_sync(qd);
1013
1014                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1015
1016                 if (sync && qd_trylock(qd))
1017                         qda[count++] = qd;
1018         }
1019
1020         if (count) {
1021                 do_sync(count, qda);
1022                 for (x = 0; x < count; x++)
1023                         qd_unlock(qda[x]);
1024         }
1025
1026 out:
1027         gfs2_quota_unhold(ip);
1028 }
1029
1030 #define MAX_LINE 256
1031
1032 static int print_message(struct gfs2_quota_data *qd, char *type)
1033 {
1034         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1035
1036         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1037                sdp->sd_fsname, type,
1038                (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1039                from_kqid(&init_user_ns, qd->qd_id));
1040
1041         return 0;
1042 }
1043
1044 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1045 {
1046         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1047         struct gfs2_quota_data *qd;
1048         s64 value;
1049         unsigned int x;
1050         int error = 0;
1051
1052         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1053                 return 0;
1054
1055         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1056                 return 0;
1057
1058         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1059                 qd = ip->i_res->rs_qa_qd[x];
1060
1061                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1062                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1063                         continue;
1064
1065                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1066                 spin_lock(&qd_lru_lock);
1067                 value += qd->qd_change;
1068                 spin_unlock(&qd_lru_lock);
1069
1070                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1071                         print_message(qd, "exceeded");
1072                         quota_send_warning(qd->qd_id,
1073                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1074
1075                         error = -EDQUOT;
1076                         break;
1077                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1078                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1079                            time_after_eq(jiffies, qd->qd_last_warn +
1080                                          gfs2_tune_get(sdp,
1081                                                 gt_quota_warn_period) * HZ)) {
1082                         quota_send_warning(qd->qd_id,
1083                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1084                         error = print_message(qd, "warning");
1085                         qd->qd_last_warn = jiffies;
1086                 }
1087         }
1088
1089         return error;
1090 }
1091
1092 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1093                        kuid_t uid, kgid_t gid)
1094 {
1095         struct gfs2_quota_data *qd;
1096         unsigned int x;
1097
1098         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1099                 return;
1100         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1101                 return;
1102
1103         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1104                 qd = ip->i_res->rs_qa_qd[x];
1105
1106                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1107                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1108                         do_qc(qd, change);
1109                 }
1110         }
1111 }
1112
1113 int gfs2_quota_sync(struct super_block *sb, int type)
1114 {
1115         struct gfs2_sbd *sdp = sb->s_fs_info;
1116         struct gfs2_quota_data **qda;
1117         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1118         unsigned int num_qd;
1119         unsigned int x;
1120         int error = 0;
1121
1122         sdp->sd_quota_sync_gen++;
1123
1124         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1125         if (!qda)
1126                 return -ENOMEM;
1127
1128         do {
1129                 num_qd = 0;
1130
1131                 for (;;) {
1132                         error = qd_fish(sdp, qda + num_qd);
1133                         if (error || !qda[num_qd])
1134                                 break;
1135                         if (++num_qd == max_qd)
1136                                 break;
1137                 }
1138
1139                 if (num_qd) {
1140                         if (!error)
1141                                 error = do_sync(num_qd, qda);
1142                         if (!error)
1143                                 for (x = 0; x < num_qd; x++)
1144                                         qda[x]->qd_sync_gen =
1145                                                 sdp->sd_quota_sync_gen;
1146
1147                         for (x = 0; x < num_qd; x++)
1148                                 qd_unlock(qda[x]);
1149                 }
1150         } while (!error && num_qd == max_qd);
1151
1152         kfree(qda);
1153
1154         return error;
1155 }
1156
1157 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1158 {
1159         return gfs2_quota_sync(sb, type);
1160 }
1161
1162 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1163 {
1164         struct gfs2_quota_data *qd;
1165         struct gfs2_holder q_gh;
1166         int error;
1167
1168         error = qd_get(sdp, qid, &qd);
1169         if (error)
1170                 return error;
1171
1172         error = do_glock(qd, FORCE, &q_gh);
1173         if (!error)
1174                 gfs2_glock_dq_uninit(&q_gh);
1175
1176         qd_put(qd);
1177         return error;
1178 }
1179
1180 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1181 {
1182         const struct gfs2_quota_change *str = buf;
1183
1184         qc->qc_change = be64_to_cpu(str->qc_change);
1185         qc->qc_flags = be32_to_cpu(str->qc_flags);
1186         qc->qc_id = make_kqid(&init_user_ns,
1187                               (qc->qc_flags & GFS2_QCF_USER)?USRQUOTA:GRPQUOTA,
1188                               be32_to_cpu(str->qc_id));
1189 }
1190
1191 int gfs2_quota_init(struct gfs2_sbd *sdp)
1192 {
1193         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1194         u64 size = i_size_read(sdp->sd_qc_inode);
1195         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1196         unsigned int x, slot = 0;
1197         unsigned int found = 0;
1198         u64 dblock;
1199         u32 extlen = 0;
1200         int error;
1201
1202         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1203                 return -EIO;
1204
1205         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1206         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1207
1208         error = -ENOMEM;
1209
1210         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1211                                        sizeof(unsigned char *), GFP_NOFS);
1212         if (!sdp->sd_quota_bitmap)
1213                 return error;
1214
1215         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1216                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1217                 if (!sdp->sd_quota_bitmap[x])
1218                         goto fail;
1219         }
1220
1221         for (x = 0; x < blocks; x++) {
1222                 struct buffer_head *bh;
1223                 unsigned int y;
1224
1225                 if (!extlen) {
1226                         int new = 0;
1227                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1228                         if (error)
1229                                 goto fail;
1230                 }
1231                 error = -EIO;
1232                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1233                 if (!bh)
1234                         goto fail;
1235                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1236                         brelse(bh);
1237                         goto fail;
1238                 }
1239
1240                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1241                      y++, slot++) {
1242                         struct gfs2_quota_change_host qc;
1243                         struct gfs2_quota_data *qd;
1244
1245                         gfs2_quota_change_in(&qc, bh->b_data +
1246                                           sizeof(struct gfs2_meta_header) +
1247                                           y * sizeof(struct gfs2_quota_change));
1248                         if (!qc.qc_change)
1249                                 continue;
1250
1251                         error = qd_alloc(sdp, qc.qc_id, &qd);
1252                         if (error) {
1253                                 brelse(bh);
1254                                 goto fail;
1255                         }
1256
1257                         set_bit(QDF_CHANGE, &qd->qd_flags);
1258                         qd->qd_change = qc.qc_change;
1259                         qd->qd_slot = slot;
1260                         qd->qd_slot_count = 1;
1261
1262                         spin_lock(&qd_lru_lock);
1263                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1264                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1265                         atomic_inc(&sdp->sd_quota_count);
1266                         spin_unlock(&qd_lru_lock);
1267
1268                         found++;
1269                 }
1270
1271                 brelse(bh);
1272                 dblock++;
1273                 extlen--;
1274         }
1275
1276         if (found)
1277                 fs_info(sdp, "found %u quota changes\n", found);
1278
1279         return 0;
1280
1281 fail:
1282         gfs2_quota_cleanup(sdp);
1283         return error;
1284 }
1285
1286 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1287 {
1288         struct list_head *head = &sdp->sd_quota_list;
1289         struct gfs2_quota_data *qd;
1290         unsigned int x;
1291
1292         spin_lock(&qd_lru_lock);
1293         while (!list_empty(head)) {
1294                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1295
1296                 if (atomic_read(&qd->qd_count) > 1 ||
1297                     (atomic_read(&qd->qd_count) &&
1298                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1299                         list_move(&qd->qd_list, head);
1300                         spin_unlock(&qd_lru_lock);
1301                         schedule();
1302                         spin_lock(&qd_lru_lock);
1303                         continue;
1304                 }
1305
1306                 list_del(&qd->qd_list);
1307                 /* Also remove if this qd exists in the reclaim list */
1308                 if (!list_empty(&qd->qd_reclaim)) {
1309                         list_del_init(&qd->qd_reclaim);
1310                         atomic_dec(&qd_lru_count);
1311                 }
1312                 atomic_dec(&sdp->sd_quota_count);
1313                 spin_unlock(&qd_lru_lock);
1314
1315                 if (!atomic_read(&qd->qd_count)) {
1316                         gfs2_assert_warn(sdp, !qd->qd_change);
1317                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1318                 } else
1319                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1320                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1321
1322                 gfs2_glock_put(qd->qd_gl);
1323                 kmem_cache_free(gfs2_quotad_cachep, qd);
1324
1325                 spin_lock(&qd_lru_lock);
1326         }
1327         spin_unlock(&qd_lru_lock);
1328
1329         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1330
1331         if (sdp->sd_quota_bitmap) {
1332                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1333                         kfree(sdp->sd_quota_bitmap[x]);
1334                 kfree(sdp->sd_quota_bitmap);
1335         }
1336 }
1337
1338 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1339 {
1340         if (error == 0 || error == -EROFS)
1341                 return;
1342         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1343                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1344 }
1345
1346 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1347                                int (*fxn)(struct super_block *sb, int type),
1348                                unsigned long t, unsigned long *timeo,
1349                                unsigned int *new_timeo)
1350 {
1351         if (t >= *timeo) {
1352                 int error = fxn(sdp->sd_vfs, 0);
1353                 quotad_error(sdp, msg, error);
1354                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1355         } else {
1356                 *timeo -= t;
1357         }
1358 }
1359
1360 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1361 {
1362         struct gfs2_inode *ip;
1363
1364         while(1) {
1365                 ip = NULL;
1366                 spin_lock(&sdp->sd_trunc_lock);
1367                 if (!list_empty(&sdp->sd_trunc_list)) {
1368                         ip = list_entry(sdp->sd_trunc_list.next,
1369                                         struct gfs2_inode, i_trunc_list);
1370                         list_del_init(&ip->i_trunc_list);
1371                 }
1372                 spin_unlock(&sdp->sd_trunc_lock);
1373                 if (ip == NULL)
1374                         return;
1375                 gfs2_glock_finish_truncate(ip);
1376         }
1377 }
1378
1379 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1380         if (!sdp->sd_statfs_force_sync) {
1381                 sdp->sd_statfs_force_sync = 1;
1382                 wake_up(&sdp->sd_quota_wait);
1383         }
1384 }
1385
1386
1387 /**
1388  * gfs2_quotad - Write cached quota changes into the quota file
1389  * @sdp: Pointer to GFS2 superblock
1390  *
1391  */
1392
1393 int gfs2_quotad(void *data)
1394 {
1395         struct gfs2_sbd *sdp = data;
1396         struct gfs2_tune *tune = &sdp->sd_tune;
1397         unsigned long statfs_timeo = 0;
1398         unsigned long quotad_timeo = 0;
1399         unsigned long t = 0;
1400         DEFINE_WAIT(wait);
1401         int empty;
1402
1403         while (!kthread_should_stop()) {
1404
1405                 /* Update the master statfs file */
1406                 if (sdp->sd_statfs_force_sync) {
1407                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1408                         quotad_error(sdp, "statfs", error);
1409                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1410                 }
1411                 else
1412                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1413                                            &statfs_timeo,
1414                                            &tune->gt_statfs_quantum);
1415
1416                 /* Update quota file */
1417                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1418                                    &quotad_timeo, &tune->gt_quota_quantum);
1419
1420                 /* Check for & recover partially truncated inodes */
1421                 quotad_check_trunc_list(sdp);
1422
1423                 try_to_freeze();
1424
1425                 t = min(quotad_timeo, statfs_timeo);
1426
1427                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1428                 spin_lock(&sdp->sd_trunc_lock);
1429                 empty = list_empty(&sdp->sd_trunc_list);
1430                 spin_unlock(&sdp->sd_trunc_lock);
1431                 if (empty && !sdp->sd_statfs_force_sync)
1432                         t -= schedule_timeout(t);
1433                 else
1434                         t = 0;
1435                 finish_wait(&sdp->sd_quota_wait, &wait);
1436         }
1437
1438         return 0;
1439 }
1440
1441 static int gfs2_quota_get_xstate(struct super_block *sb,
1442                                  struct fs_quota_stat *fqs)
1443 {
1444         struct gfs2_sbd *sdp = sb->s_fs_info;
1445
1446         memset(fqs, 0, sizeof(struct fs_quota_stat));
1447         fqs->qs_version = FS_QSTAT_VERSION;
1448
1449         switch (sdp->sd_args.ar_quota) {
1450         case GFS2_QUOTA_ON:
1451                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1452                 /*FALLTHRU*/
1453         case GFS2_QUOTA_ACCOUNT:
1454                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1455                 break;
1456         case GFS2_QUOTA_OFF:
1457                 break;
1458         }
1459
1460         if (sdp->sd_quota_inode) {
1461                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1462                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1463         }
1464         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1465         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1466         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1467         return 0;
1468 }
1469
1470 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1471                           struct fs_disk_quota *fdq)
1472 {
1473         struct gfs2_sbd *sdp = sb->s_fs_info;
1474         struct gfs2_quota_lvb *qlvb;
1475         struct gfs2_quota_data *qd;
1476         struct gfs2_holder q_gh;
1477         int error;
1478
1479         memset(fdq, 0, sizeof(struct fs_disk_quota));
1480
1481         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1482                 return -ESRCH; /* Crazy XFS error code */
1483
1484         if ((qid.type != USRQUOTA) &&
1485             (qid.type != GRPQUOTA))
1486                 return -EINVAL;
1487
1488         error = qd_get(sdp, qid, &qd);
1489         if (error)
1490                 return error;
1491         error = do_glock(qd, FORCE, &q_gh);
1492         if (error)
1493                 goto out;
1494
1495         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1496         fdq->d_version = FS_DQUOT_VERSION;
1497         fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1498         fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1499         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1500         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1501         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1502
1503         gfs2_glock_dq_uninit(&q_gh);
1504 out:
1505         qd_put(qd);
1506         return error;
1507 }
1508
1509 /* GFS2 only supports a subset of the XFS fields */
1510 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1511
1512 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1513                           struct fs_disk_quota *fdq)
1514 {
1515         struct gfs2_sbd *sdp = sb->s_fs_info;
1516         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1517         struct gfs2_quota_data *qd;
1518         struct gfs2_holder q_gh, i_gh;
1519         unsigned int data_blocks, ind_blocks;
1520         unsigned int blocks = 0;
1521         int alloc_required;
1522         loff_t offset;
1523         int error;
1524
1525         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1526                 return -ESRCH; /* Crazy XFS error code */
1527
1528         if ((qid.type != USRQUOTA) &&
1529             (qid.type != GRPQUOTA))
1530                 return -EINVAL;
1531
1532         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1533                 return -EINVAL;
1534
1535         error = qd_get(sdp, qid, &qd);
1536         if (error)
1537                 return error;
1538
1539         error = gfs2_rs_alloc(ip);
1540         if (error)
1541                 goto out_put;
1542
1543         mutex_lock(&ip->i_inode.i_mutex);
1544         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1545         if (error)
1546                 goto out_unlockput;
1547         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1548         if (error)
1549                 goto out_q;
1550
1551         /* Check for existing entry, if none then alloc new blocks */
1552         error = update_qd(sdp, qd);
1553         if (error)
1554                 goto out_i;
1555
1556         /* If nothing has changed, this is a no-op */
1557         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1558             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1559                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1560
1561         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1562             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1563                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1564
1565         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1566             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1567                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1568
1569         if (fdq->d_fieldmask == 0)
1570                 goto out_i;
1571
1572         offset = qd2offset(qd);
1573         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1574         if (gfs2_is_stuffed(ip))
1575                 alloc_required = 1;
1576         if (alloc_required) {
1577                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1578                                        &data_blocks, &ind_blocks);
1579                 blocks = 1 + data_blocks + ind_blocks;
1580                 error = gfs2_inplace_reserve(ip, blocks, 0);
1581                 if (error)
1582                         goto out_i;
1583                 blocks += gfs2_rg_blocks(ip, blocks);
1584         }
1585
1586         /* Some quotas span block boundaries and can update two blocks,
1587            adding an extra block to the transaction to handle such quotas */
1588         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1589         if (error)
1590                 goto out_release;
1591
1592         /* Apply changes */
1593         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1594
1595         gfs2_trans_end(sdp);
1596 out_release:
1597         if (alloc_required)
1598                 gfs2_inplace_release(ip);
1599 out_i:
1600         gfs2_glock_dq_uninit(&i_gh);
1601 out_q:
1602         gfs2_glock_dq_uninit(&q_gh);
1603 out_unlockput:
1604         mutex_unlock(&ip->i_inode.i_mutex);
1605 out_put:
1606         qd_put(qd);
1607         return error;
1608 }
1609
1610 const struct quotactl_ops gfs2_quotactl_ops = {
1611         .quota_sync     = gfs2_quota_sync,
1612         .get_xstate     = gfs2_quota_get_xstate,
1613         .get_dqblk      = gfs2_get_dqblk,
1614         .set_dqblk      = gfs2_set_dqblk,
1615 };