Merge git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-nmw
[~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 #define QUOTA_USER 1
69 #define QUOTA_GROUP 0
70
71 struct gfs2_quota_change_host {
72         u64 qc_change;
73         u32 qc_flags; /* GFS2_QCF_... */
74         u32 qc_id;
75 };
76
77 static LIST_HEAD(qd_lru_list);
78 static atomic_t qd_lru_count = ATOMIC_INIT(0);
79 static DEFINE_SPINLOCK(qd_lru_lock);
80
81 int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc)
82 {
83         struct gfs2_quota_data *qd;
84         struct gfs2_sbd *sdp;
85         int nr_to_scan = sc->nr_to_scan;
86
87         if (nr_to_scan == 0)
88                 goto out;
89
90         if (!(sc->gfp_mask & __GFP_FS))
91                 return -1;
92
93         spin_lock(&qd_lru_lock);
94         while (nr_to_scan && !list_empty(&qd_lru_list)) {
95                 qd = list_entry(qd_lru_list.next,
96                                 struct gfs2_quota_data, qd_reclaim);
97                 sdp = qd->qd_gl->gl_sbd;
98
99                 /* Free from the filesystem-specific list */
100                 list_del(&qd->qd_list);
101
102                 gfs2_assert_warn(sdp, !qd->qd_change);
103                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
104                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
105
106                 gfs2_glock_put(qd->qd_gl);
107                 atomic_dec(&sdp->sd_quota_count);
108
109                 /* Delete it from the common reclaim list */
110                 list_del_init(&qd->qd_reclaim);
111                 atomic_dec(&qd_lru_count);
112                 spin_unlock(&qd_lru_lock);
113                 kmem_cache_free(gfs2_quotad_cachep, qd);
114                 spin_lock(&qd_lru_lock);
115                 nr_to_scan--;
116         }
117         spin_unlock(&qd_lru_lock);
118
119 out:
120         return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
121 }
122
123 static u64 qd2offset(struct gfs2_quota_data *qd)
124 {
125         u64 offset;
126
127         offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
128         offset *= sizeof(struct gfs2_quota);
129
130         return offset;
131 }
132
133 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
134                     struct gfs2_quota_data **qdp)
135 {
136         struct gfs2_quota_data *qd;
137         int error;
138
139         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
140         if (!qd)
141                 return -ENOMEM;
142
143         atomic_set(&qd->qd_count, 1);
144         qd->qd_id = id;
145         if (user)
146                 set_bit(QDF_USER, &qd->qd_flags);
147         qd->qd_slot = -1;
148         INIT_LIST_HEAD(&qd->qd_reclaim);
149
150         error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
151                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
152         if (error)
153                 goto fail;
154
155         *qdp = qd;
156
157         return 0;
158
159 fail:
160         kmem_cache_free(gfs2_quotad_cachep, qd);
161         return error;
162 }
163
164 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
165                   struct gfs2_quota_data **qdp)
166 {
167         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
168         int error, found;
169
170         *qdp = NULL;
171
172         for (;;) {
173                 found = 0;
174                 spin_lock(&qd_lru_lock);
175                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
176                         if (qd->qd_id == id &&
177                             !test_bit(QDF_USER, &qd->qd_flags) == !user) {
178                                 if (!atomic_read(&qd->qd_count) &&
179                                     !list_empty(&qd->qd_reclaim)) {
180                                         /* Remove it from reclaim list */
181                                         list_del_init(&qd->qd_reclaim);
182                                         atomic_dec(&qd_lru_count);
183                                 }
184                                 atomic_inc(&qd->qd_count);
185                                 found = 1;
186                                 break;
187                         }
188                 }
189
190                 if (!found)
191                         qd = NULL;
192
193                 if (!qd && new_qd) {
194                         qd = new_qd;
195                         list_add(&qd->qd_list, &sdp->sd_quota_list);
196                         atomic_inc(&sdp->sd_quota_count);
197                         new_qd = NULL;
198                 }
199
200                 spin_unlock(&qd_lru_lock);
201
202                 if (qd) {
203                         if (new_qd) {
204                                 gfs2_glock_put(new_qd->qd_gl);
205                                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
206                         }
207                         *qdp = qd;
208                         return 0;
209                 }
210
211                 error = qd_alloc(sdp, user, id, &new_qd);
212                 if (error)
213                         return error;
214         }
215 }
216
217 static void qd_hold(struct gfs2_quota_data *qd)
218 {
219         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
220         gfs2_assert(sdp, atomic_read(&qd->qd_count));
221         atomic_inc(&qd->qd_count);
222 }
223
224 static void qd_put(struct gfs2_quota_data *qd)
225 {
226         if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
227                 /* Add to the reclaim list */
228                 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
229                 atomic_inc(&qd_lru_count);
230                 spin_unlock(&qd_lru_lock);
231         }
232 }
233
234 static int slot_get(struct gfs2_quota_data *qd)
235 {
236         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
237         unsigned int c, o = 0, b;
238         unsigned char byte = 0;
239
240         spin_lock(&qd_lru_lock);
241
242         if (qd->qd_slot_count++) {
243                 spin_unlock(&qd_lru_lock);
244                 return 0;
245         }
246
247         for (c = 0; c < sdp->sd_quota_chunks; c++)
248                 for (o = 0; o < PAGE_SIZE; o++) {
249                         byte = sdp->sd_quota_bitmap[c][o];
250                         if (byte != 0xFF)
251                                 goto found;
252                 }
253
254         goto fail;
255
256 found:
257         for (b = 0; b < 8; b++)
258                 if (!(byte & (1 << b)))
259                         break;
260         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
261
262         if (qd->qd_slot >= sdp->sd_quota_slots)
263                 goto fail;
264
265         sdp->sd_quota_bitmap[c][o] |= 1 << b;
266
267         spin_unlock(&qd_lru_lock);
268
269         return 0;
270
271 fail:
272         qd->qd_slot_count--;
273         spin_unlock(&qd_lru_lock);
274         return -ENOSPC;
275 }
276
277 static void slot_hold(struct gfs2_quota_data *qd)
278 {
279         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
280
281         spin_lock(&qd_lru_lock);
282         gfs2_assert(sdp, qd->qd_slot_count);
283         qd->qd_slot_count++;
284         spin_unlock(&qd_lru_lock);
285 }
286
287 static void slot_put(struct gfs2_quota_data *qd)
288 {
289         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
290
291         spin_lock(&qd_lru_lock);
292         gfs2_assert(sdp, qd->qd_slot_count);
293         if (!--qd->qd_slot_count) {
294                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
295                 qd->qd_slot = -1;
296         }
297         spin_unlock(&qd_lru_lock);
298 }
299
300 static int bh_get(struct gfs2_quota_data *qd)
301 {
302         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
303         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
304         unsigned int block, offset;
305         struct buffer_head *bh;
306         int error;
307         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
308
309         mutex_lock(&sdp->sd_quota_mutex);
310
311         if (qd->qd_bh_count++) {
312                 mutex_unlock(&sdp->sd_quota_mutex);
313                 return 0;
314         }
315
316         block = qd->qd_slot / sdp->sd_qc_per_block;
317         offset = qd->qd_slot % sdp->sd_qc_per_block;
318
319         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
320         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
321         if (error)
322                 goto fail;
323         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
324         if (error)
325                 goto fail;
326         error = -EIO;
327         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
328                 goto fail_brelse;
329
330         qd->qd_bh = bh;
331         qd->qd_bh_qc = (struct gfs2_quota_change *)
332                 (bh->b_data + sizeof(struct gfs2_meta_header) +
333                  offset * sizeof(struct gfs2_quota_change));
334
335         mutex_unlock(&sdp->sd_quota_mutex);
336
337         return 0;
338
339 fail_brelse:
340         brelse(bh);
341 fail:
342         qd->qd_bh_count--;
343         mutex_unlock(&sdp->sd_quota_mutex);
344         return error;
345 }
346
347 static void bh_put(struct gfs2_quota_data *qd)
348 {
349         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
350
351         mutex_lock(&sdp->sd_quota_mutex);
352         gfs2_assert(sdp, qd->qd_bh_count);
353         if (!--qd->qd_bh_count) {
354                 brelse(qd->qd_bh);
355                 qd->qd_bh = NULL;
356                 qd->qd_bh_qc = NULL;
357         }
358         mutex_unlock(&sdp->sd_quota_mutex);
359 }
360
361 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
362 {
363         struct gfs2_quota_data *qd = NULL;
364         int error;
365         int found = 0;
366
367         *qdp = NULL;
368
369         if (sdp->sd_vfs->s_flags & MS_RDONLY)
370                 return 0;
371
372         spin_lock(&qd_lru_lock);
373
374         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
375                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
376                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
377                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
378                         continue;
379
380                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
381
382                 set_bit(QDF_LOCKED, &qd->qd_flags);
383                 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
384                 atomic_inc(&qd->qd_count);
385                 qd->qd_change_sync = qd->qd_change;
386                 gfs2_assert_warn(sdp, qd->qd_slot_count);
387                 qd->qd_slot_count++;
388                 found = 1;
389
390                 break;
391         }
392
393         if (!found)
394                 qd = NULL;
395
396         spin_unlock(&qd_lru_lock);
397
398         if (qd) {
399                 gfs2_assert_warn(sdp, qd->qd_change_sync);
400                 error = bh_get(qd);
401                 if (error) {
402                         clear_bit(QDF_LOCKED, &qd->qd_flags);
403                         slot_put(qd);
404                         qd_put(qd);
405                         return error;
406                 }
407         }
408
409         *qdp = qd;
410
411         return 0;
412 }
413
414 static int qd_trylock(struct gfs2_quota_data *qd)
415 {
416         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
417
418         if (sdp->sd_vfs->s_flags & MS_RDONLY)
419                 return 0;
420
421         spin_lock(&qd_lru_lock);
422
423         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
424             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
425                 spin_unlock(&qd_lru_lock);
426                 return 0;
427         }
428
429         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
430
431         set_bit(QDF_LOCKED, &qd->qd_flags);
432         gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
433         atomic_inc(&qd->qd_count);
434         qd->qd_change_sync = qd->qd_change;
435         gfs2_assert_warn(sdp, qd->qd_slot_count);
436         qd->qd_slot_count++;
437
438         spin_unlock(&qd_lru_lock);
439
440         gfs2_assert_warn(sdp, qd->qd_change_sync);
441         if (bh_get(qd)) {
442                 clear_bit(QDF_LOCKED, &qd->qd_flags);
443                 slot_put(qd);
444                 qd_put(qd);
445                 return 0;
446         }
447
448         return 1;
449 }
450
451 static void qd_unlock(struct gfs2_quota_data *qd)
452 {
453         gfs2_assert_warn(qd->qd_gl->gl_sbd,
454                          test_bit(QDF_LOCKED, &qd->qd_flags));
455         clear_bit(QDF_LOCKED, &qd->qd_flags);
456         bh_put(qd);
457         slot_put(qd);
458         qd_put(qd);
459 }
460
461 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
462                     struct gfs2_quota_data **qdp)
463 {
464         int error;
465
466         error = qd_get(sdp, user, id, qdp);
467         if (error)
468                 return error;
469
470         error = slot_get(*qdp);
471         if (error)
472                 goto fail;
473
474         error = bh_get(*qdp);
475         if (error)
476                 goto fail_slot;
477
478         return 0;
479
480 fail_slot:
481         slot_put(*qdp);
482 fail:
483         qd_put(*qdp);
484         return error;
485 }
486
487 static void qdsb_put(struct gfs2_quota_data *qd)
488 {
489         bh_put(qd);
490         slot_put(qd);
491         qd_put(qd);
492 }
493
494 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
495 {
496         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
497         struct gfs2_quota_data **qd;
498         int error;
499
500         if (ip->i_res == NULL) {
501                 error = gfs2_rs_alloc(ip);
502                 if (error)
503                         return error;
504         }
505
506         qd = ip->i_res->rs_qa_qd;
507
508         if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
509             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
510                 return -EIO;
511
512         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
513                 return 0;
514
515         error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
516         if (error)
517                 goto out;
518         ip->i_res->rs_qa_qd_num++;
519         qd++;
520
521         error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
522         if (error)
523                 goto out;
524         ip->i_res->rs_qa_qd_num++;
525         qd++;
526
527         if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
528                 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
529                 if (error)
530                         goto out;
531                 ip->i_res->rs_qa_qd_num++;
532                 qd++;
533         }
534
535         if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
536                 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
537                 if (error)
538                         goto out;
539                 ip->i_res->rs_qa_qd_num++;
540                 qd++;
541         }
542
543 out:
544         if (error)
545                 gfs2_quota_unhold(ip);
546         return error;
547 }
548
549 void gfs2_quota_unhold(struct gfs2_inode *ip)
550 {
551         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
552         unsigned int x;
553
554         if (ip->i_res == NULL)
555                 return;
556         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
557
558         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
559                 qdsb_put(ip->i_res->rs_qa_qd[x]);
560                 ip->i_res->rs_qa_qd[x] = NULL;
561         }
562         ip->i_res->rs_qa_qd_num = 0;
563 }
564
565 static int sort_qd(const void *a, const void *b)
566 {
567         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
568         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
569
570         if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
571             !test_bit(QDF_USER, &qd_b->qd_flags)) {
572                 if (test_bit(QDF_USER, &qd_a->qd_flags))
573                         return -1;
574                 else
575                         return 1;
576         }
577         if (qd_a->qd_id < qd_b->qd_id)
578                 return -1;
579         if (qd_a->qd_id > qd_b->qd_id)
580                 return 1;
581
582         return 0;
583 }
584
585 static void do_qc(struct gfs2_quota_data *qd, s64 change)
586 {
587         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
588         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
589         struct gfs2_quota_change *qc = qd->qd_bh_qc;
590         s64 x;
591
592         mutex_lock(&sdp->sd_quota_mutex);
593         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
594
595         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
596                 qc->qc_change = 0;
597                 qc->qc_flags = 0;
598                 if (test_bit(QDF_USER, &qd->qd_flags))
599                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
600                 qc->qc_id = cpu_to_be32(qd->qd_id);
601         }
602
603         x = be64_to_cpu(qc->qc_change) + change;
604         qc->qc_change = cpu_to_be64(x);
605
606         spin_lock(&qd_lru_lock);
607         qd->qd_change = x;
608         spin_unlock(&qd_lru_lock);
609
610         if (!x) {
611                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
612                 clear_bit(QDF_CHANGE, &qd->qd_flags);
613                 qc->qc_flags = 0;
614                 qc->qc_id = 0;
615                 slot_put(qd);
616                 qd_put(qd);
617         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
618                 qd_hold(qd);
619                 slot_hold(qd);
620         }
621
622         mutex_unlock(&sdp->sd_quota_mutex);
623 }
624
625 /**
626  * gfs2_adjust_quota - adjust record of current block usage
627  * @ip: The quota inode
628  * @loc: Offset of the entry in the quota file
629  * @change: The amount of usage change to record
630  * @qd: The quota data
631  * @fdq: The updated limits to record
632  *
633  * This function was mostly borrowed from gfs2_block_truncate_page which was
634  * in turn mostly borrowed from ext3
635  *
636  * Returns: 0 or -ve on error
637  */
638
639 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
640                              s64 change, struct gfs2_quota_data *qd,
641                              struct fs_disk_quota *fdq)
642 {
643         struct inode *inode = &ip->i_inode;
644         struct gfs2_sbd *sdp = GFS2_SB(inode);
645         struct address_space *mapping = inode->i_mapping;
646         unsigned long index = loc >> PAGE_CACHE_SHIFT;
647         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
648         unsigned blocksize, iblock, pos;
649         struct buffer_head *bh;
650         struct page *page;
651         void *kaddr, *ptr;
652         struct gfs2_quota q, *qp;
653         int err, nbytes;
654         u64 size;
655
656         if (gfs2_is_stuffed(ip)) {
657                 err = gfs2_unstuff_dinode(ip, NULL);
658                 if (err)
659                         return err;
660         }
661
662         memset(&q, 0, sizeof(struct gfs2_quota));
663         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
664         if (err < 0)
665                 return err;
666
667         err = -EIO;
668         qp = &q;
669         qp->qu_value = be64_to_cpu(qp->qu_value);
670         qp->qu_value += change;
671         qp->qu_value = cpu_to_be64(qp->qu_value);
672         qd->qd_qb.qb_value = qp->qu_value;
673         if (fdq) {
674                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
675                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
676                         qd->qd_qb.qb_warn = qp->qu_warn;
677                 }
678                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
679                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
680                         qd->qd_qb.qb_limit = qp->qu_limit;
681                 }
682                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
683                         qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
684                         qd->qd_qb.qb_value = qp->qu_value;
685                 }
686         }
687
688         /* Write the quota into the quota file on disk */
689         ptr = qp;
690         nbytes = sizeof(struct gfs2_quota);
691 get_a_page:
692         page = find_or_create_page(mapping, index, GFP_NOFS);
693         if (!page)
694                 return -ENOMEM;
695
696         blocksize = inode->i_sb->s_blocksize;
697         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
698
699         if (!page_has_buffers(page))
700                 create_empty_buffers(page, blocksize, 0);
701
702         bh = page_buffers(page);
703         pos = blocksize;
704         while (offset >= pos) {
705                 bh = bh->b_this_page;
706                 iblock++;
707                 pos += blocksize;
708         }
709
710         if (!buffer_mapped(bh)) {
711                 gfs2_block_map(inode, iblock, bh, 1);
712                 if (!buffer_mapped(bh))
713                         goto unlock_out;
714                 /* If it's a newly allocated disk block for quota, zero it */
715                 if (buffer_new(bh))
716                         zero_user(page, pos - blocksize, bh->b_size);
717         }
718
719         if (PageUptodate(page))
720                 set_buffer_uptodate(bh);
721
722         if (!buffer_uptodate(bh)) {
723                 ll_rw_block(READ | REQ_META, 1, &bh);
724                 wait_on_buffer(bh);
725                 if (!buffer_uptodate(bh))
726                         goto unlock_out;
727         }
728
729         gfs2_trans_add_meta(ip->i_gl, bh);
730
731         kaddr = kmap_atomic(page);
732         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
733                 nbytes = PAGE_CACHE_SIZE - offset;
734         memcpy(kaddr + offset, ptr, nbytes);
735         flush_dcache_page(page);
736         kunmap_atomic(kaddr);
737         unlock_page(page);
738         page_cache_release(page);
739
740         /* If quota straddles page boundary, we need to update the rest of the
741          * quota at the beginning of the next page */
742         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
743                 ptr = ptr + nbytes;
744                 nbytes = sizeof(struct gfs2_quota) - nbytes;
745                 offset = 0;
746                 index++;
747                 goto get_a_page;
748         }
749
750         size = loc + sizeof(struct gfs2_quota);
751         if (size > inode->i_size)
752                 i_size_write(inode, size);
753         inode->i_mtime = inode->i_atime = CURRENT_TIME;
754         mark_inode_dirty(inode);
755         return 0;
756
757 unlock_out:
758         unlock_page(page);
759         page_cache_release(page);
760         return err;
761 }
762
763 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
764 {
765         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
766         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
767         unsigned int data_blocks, ind_blocks;
768         struct gfs2_holder *ghs, i_gh;
769         unsigned int qx, x;
770         struct gfs2_quota_data *qd;
771         unsigned reserved;
772         loff_t offset;
773         unsigned int nalloc = 0, blocks;
774         int error;
775
776         error = gfs2_rs_alloc(ip);
777         if (error)
778                 return error;
779
780         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
781                               &data_blocks, &ind_blocks);
782
783         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
784         if (!ghs)
785                 return -ENOMEM;
786
787         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
788         mutex_lock(&ip->i_inode.i_mutex);
789         for (qx = 0; qx < num_qd; qx++) {
790                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
791                                            GL_NOCACHE, &ghs[qx]);
792                 if (error)
793                         goto out;
794         }
795
796         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
797         if (error)
798                 goto out;
799
800         for (x = 0; x < num_qd; x++) {
801                 offset = qd2offset(qda[x]);
802                 if (gfs2_write_alloc_required(ip, offset,
803                                               sizeof(struct gfs2_quota)))
804                         nalloc++;
805         }
806
807         /* 
808          * 1 blk for unstuffing inode if stuffed. We add this extra
809          * block to the reservation unconditionally. If the inode
810          * doesn't need unstuffing, the block will be released to the 
811          * rgrp since it won't be allocated during the transaction
812          */
813         /* +3 in the end for unstuffing block, inode size update block
814          * and another block in case quota straddles page boundary and 
815          * two blocks need to be updated instead of 1 */
816         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
817
818         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
819         error = gfs2_inplace_reserve(ip, reserved, 0);
820         if (error)
821                 goto out_alloc;
822
823         if (nalloc)
824                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
825
826         error = gfs2_trans_begin(sdp, blocks, 0);
827         if (error)
828                 goto out_ipres;
829
830         for (x = 0; x < num_qd; x++) {
831                 qd = qda[x];
832                 offset = qd2offset(qd);
833                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
834                 if (error)
835                         goto out_end_trans;
836
837                 do_qc(qd, -qd->qd_change_sync);
838                 set_bit(QDF_REFRESH, &qd->qd_flags);
839         }
840
841         error = 0;
842
843 out_end_trans:
844         gfs2_trans_end(sdp);
845 out_ipres:
846         gfs2_inplace_release(ip);
847 out_alloc:
848         gfs2_glock_dq_uninit(&i_gh);
849 out:
850         while (qx--)
851                 gfs2_glock_dq_uninit(&ghs[qx]);
852         mutex_unlock(&ip->i_inode.i_mutex);
853         kfree(ghs);
854         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
855         return error;
856 }
857
858 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
859 {
860         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
861         struct gfs2_quota q;
862         struct gfs2_quota_lvb *qlvb;
863         loff_t pos;
864         int error;
865
866         memset(&q, 0, sizeof(struct gfs2_quota));
867         pos = qd2offset(qd);
868         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
869         if (error < 0)
870                 return error;
871
872         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
873         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
874         qlvb->__pad = 0;
875         qlvb->qb_limit = q.qu_limit;
876         qlvb->qb_warn = q.qu_warn;
877         qlvb->qb_value = q.qu_value;
878         qd->qd_qb = *qlvb;
879
880         return 0;
881 }
882
883 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
884                     struct gfs2_holder *q_gh)
885 {
886         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
887         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
888         struct gfs2_holder i_gh;
889         int error;
890
891 restart:
892         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
893         if (error)
894                 return error;
895
896         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
897
898         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
899                 gfs2_glock_dq_uninit(q_gh);
900                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
901                                            GL_NOCACHE, q_gh);
902                 if (error)
903                         return error;
904
905                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
906                 if (error)
907                         goto fail;
908
909                 error = update_qd(sdp, qd);
910                 if (error)
911                         goto fail_gunlock;
912
913                 gfs2_glock_dq_uninit(&i_gh);
914                 gfs2_glock_dq_uninit(q_gh);
915                 force_refresh = 0;
916                 goto restart;
917         }
918
919         return 0;
920
921 fail_gunlock:
922         gfs2_glock_dq_uninit(&i_gh);
923 fail:
924         gfs2_glock_dq_uninit(q_gh);
925         return error;
926 }
927
928 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
929 {
930         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
931         struct gfs2_quota_data *qd;
932         unsigned int x;
933         int error = 0;
934
935         error = gfs2_quota_hold(ip, uid, gid);
936         if (error)
937                 return error;
938
939         if (capable(CAP_SYS_RESOURCE) ||
940             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
941                 return 0;
942
943         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
944              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
945
946         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
947                 int force = NO_FORCE;
948                 qd = ip->i_res->rs_qa_qd[x];
949                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
950                         force = FORCE;
951                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
952                 if (error)
953                         break;
954         }
955
956         if (!error)
957                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
958         else {
959                 while (x--)
960                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
961                 gfs2_quota_unhold(ip);
962         }
963
964         return error;
965 }
966
967 static int need_sync(struct gfs2_quota_data *qd)
968 {
969         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
970         struct gfs2_tune *gt = &sdp->sd_tune;
971         s64 value;
972         unsigned int num, den;
973         int do_sync = 1;
974
975         if (!qd->qd_qb.qb_limit)
976                 return 0;
977
978         spin_lock(&qd_lru_lock);
979         value = qd->qd_change;
980         spin_unlock(&qd_lru_lock);
981
982         spin_lock(&gt->gt_spin);
983         num = gt->gt_quota_scale_num;
984         den = gt->gt_quota_scale_den;
985         spin_unlock(&gt->gt_spin);
986
987         if (value < 0)
988                 do_sync = 0;
989         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
990                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
991                 do_sync = 0;
992         else {
993                 value *= gfs2_jindex_size(sdp) * num;
994                 value = div_s64(value, den);
995                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
996                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
997                         do_sync = 0;
998         }
999
1000         return do_sync;
1001 }
1002
1003 void gfs2_quota_unlock(struct gfs2_inode *ip)
1004 {
1005         struct gfs2_quota_data *qda[4];
1006         unsigned int count = 0;
1007         unsigned int x;
1008
1009         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1010                 goto out;
1011
1012         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1013                 struct gfs2_quota_data *qd;
1014                 int sync;
1015
1016                 qd = ip->i_res->rs_qa_qd[x];
1017                 sync = need_sync(qd);
1018
1019                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1020
1021                 if (sync && qd_trylock(qd))
1022                         qda[count++] = qd;
1023         }
1024
1025         if (count) {
1026                 do_sync(count, qda);
1027                 for (x = 0; x < count; x++)
1028                         qd_unlock(qda[x]);
1029         }
1030
1031 out:
1032         gfs2_quota_unhold(ip);
1033 }
1034
1035 #define MAX_LINE 256
1036
1037 static int print_message(struct gfs2_quota_data *qd, char *type)
1038 {
1039         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1040
1041         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1042                sdp->sd_fsname, type,
1043                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1044                qd->qd_id);
1045
1046         return 0;
1047 }
1048
1049 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1050 {
1051         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1052         struct gfs2_quota_data *qd;
1053         s64 value;
1054         unsigned int x;
1055         int error = 0;
1056
1057         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1058                 return 0;
1059
1060         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1061                 return 0;
1062
1063         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1064                 qd = ip->i_res->rs_qa_qd[x];
1065
1066                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1067                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1068                         continue;
1069
1070                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1071                 spin_lock(&qd_lru_lock);
1072                 value += qd->qd_change;
1073                 spin_unlock(&qd_lru_lock);
1074
1075                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1076                         print_message(qd, "exceeded");
1077                         quota_send_warning(make_kqid(&init_user_ns,
1078                                                      test_bit(QDF_USER, &qd->qd_flags) ?
1079                                                      USRQUOTA : GRPQUOTA,
1080                                                      qd->qd_id),
1081                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1082
1083                         error = -EDQUOT;
1084                         break;
1085                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1086                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1087                            time_after_eq(jiffies, qd->qd_last_warn +
1088                                          gfs2_tune_get(sdp,
1089                                                 gt_quota_warn_period) * HZ)) {
1090                         quota_send_warning(make_kqid(&init_user_ns,
1091                                                      test_bit(QDF_USER, &qd->qd_flags) ?
1092                                                      USRQUOTA : GRPQUOTA,
1093                                                      qd->qd_id),
1094                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1095                         error = print_message(qd, "warning");
1096                         qd->qd_last_warn = jiffies;
1097                 }
1098         }
1099
1100         return error;
1101 }
1102
1103 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1104                        u32 uid, u32 gid)
1105 {
1106         struct gfs2_quota_data *qd;
1107         unsigned int x;
1108
1109         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1110                 return;
1111         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1112                 return;
1113
1114         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1115                 qd = ip->i_res->rs_qa_qd[x];
1116
1117                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1118                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1119                         do_qc(qd, change);
1120                 }
1121         }
1122 }
1123
1124 int gfs2_quota_sync(struct super_block *sb, int type)
1125 {
1126         struct gfs2_sbd *sdp = sb->s_fs_info;
1127         struct gfs2_quota_data **qda;
1128         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1129         unsigned int num_qd;
1130         unsigned int x;
1131         int error = 0;
1132
1133         sdp->sd_quota_sync_gen++;
1134
1135         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1136         if (!qda)
1137                 return -ENOMEM;
1138
1139         do {
1140                 num_qd = 0;
1141
1142                 for (;;) {
1143                         error = qd_fish(sdp, qda + num_qd);
1144                         if (error || !qda[num_qd])
1145                                 break;
1146                         if (++num_qd == max_qd)
1147                                 break;
1148                 }
1149
1150                 if (num_qd) {
1151                         if (!error)
1152                                 error = do_sync(num_qd, qda);
1153                         if (!error)
1154                                 for (x = 0; x < num_qd; x++)
1155                                         qda[x]->qd_sync_gen =
1156                                                 sdp->sd_quota_sync_gen;
1157
1158                         for (x = 0; x < num_qd; x++)
1159                                 qd_unlock(qda[x]);
1160                 }
1161         } while (!error && num_qd == max_qd);
1162
1163         kfree(qda);
1164
1165         return error;
1166 }
1167
1168 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1169 {
1170         return gfs2_quota_sync(sb, type);
1171 }
1172
1173 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1174 {
1175         struct gfs2_quota_data *qd;
1176         struct gfs2_holder q_gh;
1177         int error;
1178
1179         error = qd_get(sdp, user, id, &qd);
1180         if (error)
1181                 return error;
1182
1183         error = do_glock(qd, FORCE, &q_gh);
1184         if (!error)
1185                 gfs2_glock_dq_uninit(&q_gh);
1186
1187         qd_put(qd);
1188         return error;
1189 }
1190
1191 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1192 {
1193         const struct gfs2_quota_change *str = buf;
1194
1195         qc->qc_change = be64_to_cpu(str->qc_change);
1196         qc->qc_flags = be32_to_cpu(str->qc_flags);
1197         qc->qc_id = be32_to_cpu(str->qc_id);
1198 }
1199
1200 int gfs2_quota_init(struct gfs2_sbd *sdp)
1201 {
1202         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1203         u64 size = i_size_read(sdp->sd_qc_inode);
1204         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1205         unsigned int x, slot = 0;
1206         unsigned int found = 0;
1207         u64 dblock;
1208         u32 extlen = 0;
1209         int error;
1210
1211         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1212                 return -EIO;
1213
1214         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1215         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1216
1217         error = -ENOMEM;
1218
1219         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1220                                        sizeof(unsigned char *), GFP_NOFS);
1221         if (!sdp->sd_quota_bitmap)
1222                 return error;
1223
1224         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1225                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1226                 if (!sdp->sd_quota_bitmap[x])
1227                         goto fail;
1228         }
1229
1230         for (x = 0; x < blocks; x++) {
1231                 struct buffer_head *bh;
1232                 unsigned int y;
1233
1234                 if (!extlen) {
1235                         int new = 0;
1236                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1237                         if (error)
1238                                 goto fail;
1239                 }
1240                 error = -EIO;
1241                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1242                 if (!bh)
1243                         goto fail;
1244                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1245                         brelse(bh);
1246                         goto fail;
1247                 }
1248
1249                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1250                      y++, slot++) {
1251                         struct gfs2_quota_change_host qc;
1252                         struct gfs2_quota_data *qd;
1253
1254                         gfs2_quota_change_in(&qc, bh->b_data +
1255                                           sizeof(struct gfs2_meta_header) +
1256                                           y * sizeof(struct gfs2_quota_change));
1257                         if (!qc.qc_change)
1258                                 continue;
1259
1260                         error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1261                                          qc.qc_id, &qd);
1262                         if (error) {
1263                                 brelse(bh);
1264                                 goto fail;
1265                         }
1266
1267                         set_bit(QDF_CHANGE, &qd->qd_flags);
1268                         qd->qd_change = qc.qc_change;
1269                         qd->qd_slot = slot;
1270                         qd->qd_slot_count = 1;
1271
1272                         spin_lock(&qd_lru_lock);
1273                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1274                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1275                         atomic_inc(&sdp->sd_quota_count);
1276                         spin_unlock(&qd_lru_lock);
1277
1278                         found++;
1279                 }
1280
1281                 brelse(bh);
1282                 dblock++;
1283                 extlen--;
1284         }
1285
1286         if (found)
1287                 fs_info(sdp, "found %u quota changes\n", found);
1288
1289         return 0;
1290
1291 fail:
1292         gfs2_quota_cleanup(sdp);
1293         return error;
1294 }
1295
1296 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1297 {
1298         struct list_head *head = &sdp->sd_quota_list;
1299         struct gfs2_quota_data *qd;
1300         unsigned int x;
1301
1302         spin_lock(&qd_lru_lock);
1303         while (!list_empty(head)) {
1304                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1305
1306                 if (atomic_read(&qd->qd_count) > 1 ||
1307                     (atomic_read(&qd->qd_count) &&
1308                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1309                         list_move(&qd->qd_list, head);
1310                         spin_unlock(&qd_lru_lock);
1311                         schedule();
1312                         spin_lock(&qd_lru_lock);
1313                         continue;
1314                 }
1315
1316                 list_del(&qd->qd_list);
1317                 /* Also remove if this qd exists in the reclaim list */
1318                 if (!list_empty(&qd->qd_reclaim)) {
1319                         list_del_init(&qd->qd_reclaim);
1320                         atomic_dec(&qd_lru_count);
1321                 }
1322                 atomic_dec(&sdp->sd_quota_count);
1323                 spin_unlock(&qd_lru_lock);
1324
1325                 if (!atomic_read(&qd->qd_count)) {
1326                         gfs2_assert_warn(sdp, !qd->qd_change);
1327                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1328                 } else
1329                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1330                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1331
1332                 gfs2_glock_put(qd->qd_gl);
1333                 kmem_cache_free(gfs2_quotad_cachep, qd);
1334
1335                 spin_lock(&qd_lru_lock);
1336         }
1337         spin_unlock(&qd_lru_lock);
1338
1339         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1340
1341         if (sdp->sd_quota_bitmap) {
1342                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1343                         kfree(sdp->sd_quota_bitmap[x]);
1344                 kfree(sdp->sd_quota_bitmap);
1345         }
1346 }
1347
1348 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1349 {
1350         if (error == 0 || error == -EROFS)
1351                 return;
1352         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1353                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1354 }
1355
1356 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1357                                int (*fxn)(struct super_block *sb, int type),
1358                                unsigned long t, unsigned long *timeo,
1359                                unsigned int *new_timeo)
1360 {
1361         if (t >= *timeo) {
1362                 int error = fxn(sdp->sd_vfs, 0);
1363                 quotad_error(sdp, msg, error);
1364                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1365         } else {
1366                 *timeo -= t;
1367         }
1368 }
1369
1370 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1371 {
1372         struct gfs2_inode *ip;
1373
1374         while(1) {
1375                 ip = NULL;
1376                 spin_lock(&sdp->sd_trunc_lock);
1377                 if (!list_empty(&sdp->sd_trunc_list)) {
1378                         ip = list_entry(sdp->sd_trunc_list.next,
1379                                         struct gfs2_inode, i_trunc_list);
1380                         list_del_init(&ip->i_trunc_list);
1381                 }
1382                 spin_unlock(&sdp->sd_trunc_lock);
1383                 if (ip == NULL)
1384                         return;
1385                 gfs2_glock_finish_truncate(ip);
1386         }
1387 }
1388
1389 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1390         if (!sdp->sd_statfs_force_sync) {
1391                 sdp->sd_statfs_force_sync = 1;
1392                 wake_up(&sdp->sd_quota_wait);
1393         }
1394 }
1395
1396
1397 /**
1398  * gfs2_quotad - Write cached quota changes into the quota file
1399  * @sdp: Pointer to GFS2 superblock
1400  *
1401  */
1402
1403 int gfs2_quotad(void *data)
1404 {
1405         struct gfs2_sbd *sdp = data;
1406         struct gfs2_tune *tune = &sdp->sd_tune;
1407         unsigned long statfs_timeo = 0;
1408         unsigned long quotad_timeo = 0;
1409         unsigned long t = 0;
1410         DEFINE_WAIT(wait);
1411         int empty;
1412
1413         while (!kthread_should_stop()) {
1414
1415                 /* Update the master statfs file */
1416                 if (sdp->sd_statfs_force_sync) {
1417                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1418                         quotad_error(sdp, "statfs", error);
1419                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1420                 }
1421                 else
1422                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1423                                            &statfs_timeo,
1424                                            &tune->gt_statfs_quantum);
1425
1426                 /* Update quota file */
1427                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1428                                    &quotad_timeo, &tune->gt_quota_quantum);
1429
1430                 /* Check for & recover partially truncated inodes */
1431                 quotad_check_trunc_list(sdp);
1432
1433                 try_to_freeze();
1434
1435                 t = min(quotad_timeo, statfs_timeo);
1436
1437                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1438                 spin_lock(&sdp->sd_trunc_lock);
1439                 empty = list_empty(&sdp->sd_trunc_list);
1440                 spin_unlock(&sdp->sd_trunc_lock);
1441                 if (empty && !sdp->sd_statfs_force_sync)
1442                         t -= schedule_timeout(t);
1443                 else
1444                         t = 0;
1445                 finish_wait(&sdp->sd_quota_wait, &wait);
1446         }
1447
1448         return 0;
1449 }
1450
1451 static int gfs2_quota_get_xstate(struct super_block *sb,
1452                                  struct fs_quota_stat *fqs)
1453 {
1454         struct gfs2_sbd *sdp = sb->s_fs_info;
1455
1456         memset(fqs, 0, sizeof(struct fs_quota_stat));
1457         fqs->qs_version = FS_QSTAT_VERSION;
1458
1459         switch (sdp->sd_args.ar_quota) {
1460         case GFS2_QUOTA_ON:
1461                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1462                 /*FALLTHRU*/
1463         case GFS2_QUOTA_ACCOUNT:
1464                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1465                 break;
1466         case GFS2_QUOTA_OFF:
1467                 break;
1468         }
1469
1470         if (sdp->sd_quota_inode) {
1471                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1472                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1473         }
1474         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1475         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1476         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1477         return 0;
1478 }
1479
1480 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1481                           struct fs_disk_quota *fdq)
1482 {
1483         struct gfs2_sbd *sdp = sb->s_fs_info;
1484         struct gfs2_quota_lvb *qlvb;
1485         struct gfs2_quota_data *qd;
1486         struct gfs2_holder q_gh;
1487         int error;
1488         int type;
1489
1490         memset(fdq, 0, sizeof(struct fs_disk_quota));
1491
1492         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1493                 return -ESRCH; /* Crazy XFS error code */
1494
1495         if (qid.type == USRQUOTA)
1496                 type = QUOTA_USER;
1497         else if (qid.type == GRPQUOTA)
1498                 type = QUOTA_GROUP;
1499         else
1500                 return -EINVAL;
1501
1502         error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
1503         if (error)
1504                 return error;
1505         error = do_glock(qd, FORCE, &q_gh);
1506         if (error)
1507                 goto out;
1508
1509         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1510         fdq->d_version = FS_DQUOT_VERSION;
1511         fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1512         fdq->d_id = from_kqid(&init_user_ns, qid);
1513         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1514         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1515         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1516
1517         gfs2_glock_dq_uninit(&q_gh);
1518 out:
1519         qd_put(qd);
1520         return error;
1521 }
1522
1523 /* GFS2 only supports a subset of the XFS fields */
1524 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1525
1526 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1527                           struct fs_disk_quota *fdq)
1528 {
1529         struct gfs2_sbd *sdp = sb->s_fs_info;
1530         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1531         struct gfs2_quota_data *qd;
1532         struct gfs2_holder q_gh, i_gh;
1533         unsigned int data_blocks, ind_blocks;
1534         unsigned int blocks = 0;
1535         int alloc_required;
1536         loff_t offset;
1537         int error;
1538         int type;
1539
1540         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1541                 return -ESRCH; /* Crazy XFS error code */
1542
1543         switch(qid.type) {
1544         case USRQUOTA:
1545                 type = QUOTA_USER;
1546                 if (fdq->d_flags != FS_USER_QUOTA)
1547                         return -EINVAL;
1548                 break;
1549         case GRPQUOTA:
1550                 type = QUOTA_GROUP;
1551                 if (fdq->d_flags != FS_GROUP_QUOTA)
1552                         return -EINVAL;
1553                 break;
1554         default:
1555                 return -EINVAL;
1556         }
1557
1558         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1559                 return -EINVAL;
1560         if (fdq->d_id != from_kqid(&init_user_ns, qid))
1561                 return -EINVAL;
1562
1563         error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
1564         if (error)
1565                 return error;
1566
1567         error = gfs2_rs_alloc(ip);
1568         if (error)
1569                 goto out_put;
1570
1571         mutex_lock(&ip->i_inode.i_mutex);
1572         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1573         if (error)
1574                 goto out_unlockput;
1575         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1576         if (error)
1577                 goto out_q;
1578
1579         /* Check for existing entry, if none then alloc new blocks */
1580         error = update_qd(sdp, qd);
1581         if (error)
1582                 goto out_i;
1583
1584         /* If nothing has changed, this is a no-op */
1585         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1586             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1587                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1588
1589         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1590             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1591                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1592
1593         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1594             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1595                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1596
1597         if (fdq->d_fieldmask == 0)
1598                 goto out_i;
1599
1600         offset = qd2offset(qd);
1601         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1602         if (gfs2_is_stuffed(ip))
1603                 alloc_required = 1;
1604         if (alloc_required) {
1605                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1606                                        &data_blocks, &ind_blocks);
1607                 blocks = 1 + data_blocks + ind_blocks;
1608                 error = gfs2_inplace_reserve(ip, blocks, 0);
1609                 if (error)
1610                         goto out_i;
1611                 blocks += gfs2_rg_blocks(ip, blocks);
1612         }
1613
1614         /* Some quotas span block boundaries and can update two blocks,
1615            adding an extra block to the transaction to handle such quotas */
1616         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1617         if (error)
1618                 goto out_release;
1619
1620         /* Apply changes */
1621         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1622
1623         gfs2_trans_end(sdp);
1624 out_release:
1625         if (alloc_required)
1626                 gfs2_inplace_release(ip);
1627 out_i:
1628         gfs2_glock_dq_uninit(&i_gh);
1629 out_q:
1630         gfs2_glock_dq_uninit(&q_gh);
1631 out_unlockput:
1632         mutex_unlock(&ip->i_inode.i_mutex);
1633 out_put:
1634         qd_put(qd);
1635         return error;
1636 }
1637
1638 const struct quotactl_ops gfs2_quotactl_ops = {
1639         .quota_sync     = gfs2_quota_sync,
1640         .get_xstate     = gfs2_quota_get_xstate,
1641         .get_dqblk      = gfs2_get_dqblk,
1642         .set_dqblk      = gfs2_set_dqblk,
1643 };