0e8bb13381e446f358c3c9336df038cdecc435c7
[linux-2.6.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_alloc *al = ip->i_alloc;
498         struct gfs2_quota_data **qd = al->al_qd;
499         int error;
500
501         if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
502             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
503                 return -EIO;
504
505         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
506                 return 0;
507
508         error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
509         if (error)
510                 goto out;
511         al->al_qd_num++;
512         qd++;
513
514         error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
515         if (error)
516                 goto out;
517         al->al_qd_num++;
518         qd++;
519
520         if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
521                 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
522                 if (error)
523                         goto out;
524                 al->al_qd_num++;
525                 qd++;
526         }
527
528         if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
529                 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
530                 if (error)
531                         goto out;
532                 al->al_qd_num++;
533                 qd++;
534         }
535
536 out:
537         if (error)
538                 gfs2_quota_unhold(ip);
539         return error;
540 }
541
542 void gfs2_quota_unhold(struct gfs2_inode *ip)
543 {
544         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
545         struct gfs2_alloc *al = ip->i_alloc;
546         unsigned int x;
547
548         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
549
550         for (x = 0; x < al->al_qd_num; x++) {
551                 qdsb_put(al->al_qd[x]);
552                 al->al_qd[x] = NULL;
553         }
554         al->al_qd_num = 0;
555 }
556
557 static int sort_qd(const void *a, const void *b)
558 {
559         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
560         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
561
562         if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
563             !test_bit(QDF_USER, &qd_b->qd_flags)) {
564                 if (test_bit(QDF_USER, &qd_a->qd_flags))
565                         return -1;
566                 else
567                         return 1;
568         }
569         if (qd_a->qd_id < qd_b->qd_id)
570                 return -1;
571         if (qd_a->qd_id > qd_b->qd_id)
572                 return 1;
573
574         return 0;
575 }
576
577 static void do_qc(struct gfs2_quota_data *qd, s64 change)
578 {
579         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
580         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
581         struct gfs2_quota_change *qc = qd->qd_bh_qc;
582         s64 x;
583
584         mutex_lock(&sdp->sd_quota_mutex);
585         gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
586
587         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
588                 qc->qc_change = 0;
589                 qc->qc_flags = 0;
590                 if (test_bit(QDF_USER, &qd->qd_flags))
591                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
592                 qc->qc_id = cpu_to_be32(qd->qd_id);
593         }
594
595         x = be64_to_cpu(qc->qc_change) + change;
596         qc->qc_change = cpu_to_be64(x);
597
598         spin_lock(&qd_lru_lock);
599         qd->qd_change = x;
600         spin_unlock(&qd_lru_lock);
601
602         if (!x) {
603                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
604                 clear_bit(QDF_CHANGE, &qd->qd_flags);
605                 qc->qc_flags = 0;
606                 qc->qc_id = 0;
607                 slot_put(qd);
608                 qd_put(qd);
609         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
610                 qd_hold(qd);
611                 slot_hold(qd);
612         }
613
614         mutex_unlock(&sdp->sd_quota_mutex);
615 }
616
617 /**
618  * gfs2_adjust_quota - adjust record of current block usage
619  * @ip: The quota inode
620  * @loc: Offset of the entry in the quota file
621  * @change: The amount of usage change to record
622  * @qd: The quota data
623  * @fdq: The updated limits to record
624  *
625  * This function was mostly borrowed from gfs2_block_truncate_page which was
626  * in turn mostly borrowed from ext3
627  *
628  * Returns: 0 or -ve on error
629  */
630
631 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
632                              s64 change, struct gfs2_quota_data *qd,
633                              struct fs_disk_quota *fdq)
634 {
635         struct inode *inode = &ip->i_inode;
636         struct gfs2_sbd *sdp = GFS2_SB(inode);
637         struct address_space *mapping = inode->i_mapping;
638         unsigned long index = loc >> PAGE_CACHE_SHIFT;
639         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
640         unsigned blocksize, iblock, pos;
641         struct buffer_head *bh, *dibh;
642         struct page *page;
643         void *kaddr, *ptr;
644         struct gfs2_quota q, *qp;
645         int err, nbytes;
646         u64 size;
647
648         if (gfs2_is_stuffed(ip))
649                 gfs2_unstuff_dinode(ip, NULL);
650
651         memset(&q, 0, sizeof(struct gfs2_quota));
652         err = gfs2_internal_read(ip, NULL, (char *)&q, &loc, sizeof(q));
653         if (err < 0)
654                 return err;
655
656         err = -EIO;
657         qp = &q;
658         qp->qu_value = be64_to_cpu(qp->qu_value);
659         qp->qu_value += change;
660         qp->qu_value = cpu_to_be64(qp->qu_value);
661         qd->qd_qb.qb_value = qp->qu_value;
662         if (fdq) {
663                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
664                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
665                         qd->qd_qb.qb_warn = qp->qu_warn;
666                 }
667                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
668                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
669                         qd->qd_qb.qb_limit = qp->qu_limit;
670                 }
671                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
672                         qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
673                         qd->qd_qb.qb_value = qp->qu_value;
674                 }
675         }
676
677         /* Write the quota into the quota file on disk */
678         ptr = qp;
679         nbytes = sizeof(struct gfs2_quota);
680 get_a_page:
681         page = grab_cache_page(mapping, index);
682         if (!page)
683                 return -ENOMEM;
684
685         blocksize = inode->i_sb->s_blocksize;
686         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
687
688         if (!page_has_buffers(page))
689                 create_empty_buffers(page, blocksize, 0);
690
691         bh = page_buffers(page);
692         pos = blocksize;
693         while (offset >= pos) {
694                 bh = bh->b_this_page;
695                 iblock++;
696                 pos += blocksize;
697         }
698
699         if (!buffer_mapped(bh)) {
700                 gfs2_block_map(inode, iblock, bh, 1);
701                 if (!buffer_mapped(bh))
702                         goto unlock_out;
703                 /* If it's a newly allocated disk block for quota, zero it */
704                 if (buffer_new(bh))
705                         zero_user(page, pos - blocksize, bh->b_size);
706         }
707
708         if (PageUptodate(page))
709                 set_buffer_uptodate(bh);
710
711         if (!buffer_uptodate(bh)) {
712                 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &bh);
713                 wait_on_buffer(bh);
714                 if (!buffer_uptodate(bh))
715                         goto unlock_out;
716         }
717
718         gfs2_trans_add_bh(ip->i_gl, bh, 0);
719
720         kaddr = kmap_atomic(page, KM_USER0);
721         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
722                 nbytes = PAGE_CACHE_SIZE - offset;
723         memcpy(kaddr + offset, ptr, nbytes);
724         flush_dcache_page(page);
725         kunmap_atomic(kaddr, KM_USER0);
726         unlock_page(page);
727         page_cache_release(page);
728
729         /* If quota straddles page boundary, we need to update the rest of the
730          * quota at the beginning of the next page */
731         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
732                 ptr = ptr + nbytes;
733                 nbytes = sizeof(struct gfs2_quota) - nbytes;
734                 offset = 0;
735                 index++;
736                 goto get_a_page;
737         }
738
739         /* Update the disk inode timestamp and size (if extended) */
740         err = gfs2_meta_inode_buffer(ip, &dibh);
741         if (err)
742                 goto out;
743
744         size = loc + sizeof(struct gfs2_quota);
745         if (size > inode->i_size)
746                 i_size_write(inode, size);
747         inode->i_mtime = inode->i_atime = CURRENT_TIME;
748         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
749         gfs2_dinode_out(ip, dibh->b_data);
750         brelse(dibh);
751         mark_inode_dirty(inode);
752
753 out:
754         return err;
755 unlock_out:
756         unlock_page(page);
757         page_cache_release(page);
758         return err;
759 }
760
761 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
762 {
763         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
764         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
765         unsigned int data_blocks, ind_blocks;
766         struct gfs2_holder *ghs, i_gh;
767         unsigned int qx, x;
768         struct gfs2_quota_data *qd;
769         loff_t offset;
770         unsigned int nalloc = 0, blocks;
771         struct gfs2_alloc *al = NULL;
772         int error;
773
774         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
775                               &data_blocks, &ind_blocks);
776
777         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
778         if (!ghs)
779                 return -ENOMEM;
780
781         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
782         mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
783         for (qx = 0; qx < num_qd; qx++) {
784                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
785                                            GL_NOCACHE, &ghs[qx]);
786                 if (error)
787                         goto out;
788         }
789
790         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
791         if (error)
792                 goto out;
793
794         for (x = 0; x < num_qd; x++) {
795                 offset = qd2offset(qda[x]);
796                 if (gfs2_write_alloc_required(ip, offset,
797                                               sizeof(struct gfs2_quota)))
798                         nalloc++;
799         }
800
801         al = gfs2_alloc_get(ip);
802         if (!al) {
803                 error = -ENOMEM;
804                 goto out_gunlock;
805         }
806         /* 
807          * 1 blk for unstuffing inode if stuffed. We add this extra
808          * block to the reservation unconditionally. If the inode
809          * doesn't need unstuffing, the block will be released to the 
810          * rgrp since it won't be allocated during the transaction
811          */
812         al->al_requested = 1;
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         if (nalloc)
819                 al->al_requested += nalloc * (data_blocks + ind_blocks);                
820         error = gfs2_inplace_reserve(ip);
821         if (error)
822                 goto out_alloc;
823
824         if (nalloc)
825                 blocks += gfs2_rg_blocks(al) + nalloc * ind_blocks + RES_STATFS;
826
827         error = gfs2_trans_begin(sdp, blocks, 0);
828         if (error)
829                 goto out_ipres;
830
831         for (x = 0; x < num_qd; x++) {
832                 qd = qda[x];
833                 offset = qd2offset(qd);
834                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
835                 if (error)
836                         goto out_end_trans;
837
838                 do_qc(qd, -qd->qd_change_sync);
839                 set_bit(QDF_REFRESH, &qd->qd_flags);
840         }
841
842         error = 0;
843
844 out_end_trans:
845         gfs2_trans_end(sdp);
846 out_ipres:
847         gfs2_inplace_release(ip);
848 out_alloc:
849         gfs2_alloc_put(ip);
850 out_gunlock:
851         gfs2_glock_dq_uninit(&i_gh);
852 out:
853         while (qx--)
854                 gfs2_glock_dq_uninit(&ghs[qx]);
855         mutex_unlock(&ip->i_inode.i_mutex);
856         kfree(ghs);
857         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
858         return error;
859 }
860
861 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
862 {
863         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
864         struct gfs2_quota q;
865         struct gfs2_quota_lvb *qlvb;
866         loff_t pos;
867         int error;
868
869         memset(&q, 0, sizeof(struct gfs2_quota));
870         pos = qd2offset(qd);
871         error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));
872         if (error < 0)
873                 return error;
874
875         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
876         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
877         qlvb->__pad = 0;
878         qlvb->qb_limit = q.qu_limit;
879         qlvb->qb_warn = q.qu_warn;
880         qlvb->qb_value = q.qu_value;
881         qd->qd_qb = *qlvb;
882
883         return 0;
884 }
885
886 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
887                     struct gfs2_holder *q_gh)
888 {
889         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
890         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
891         struct gfs2_holder i_gh;
892         int error;
893
894 restart:
895         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
896         if (error)
897                 return error;
898
899         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
900
901         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
902                 gfs2_glock_dq_uninit(q_gh);
903                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
904                                            GL_NOCACHE, q_gh);
905                 if (error)
906                         return error;
907
908                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
909                 if (error)
910                         goto fail;
911
912                 error = update_qd(sdp, qd);
913                 if (error)
914                         goto fail_gunlock;
915
916                 gfs2_glock_dq_uninit(&i_gh);
917                 gfs2_glock_dq_uninit(q_gh);
918                 force_refresh = 0;
919                 goto restart;
920         }
921
922         return 0;
923
924 fail_gunlock:
925         gfs2_glock_dq_uninit(&i_gh);
926 fail:
927         gfs2_glock_dq_uninit(q_gh);
928         return error;
929 }
930
931 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
932 {
933         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
934         struct gfs2_alloc *al = ip->i_alloc;
935         struct gfs2_quota_data *qd;
936         unsigned int x;
937         int error = 0;
938
939         gfs2_quota_hold(ip, uid, gid);
940
941         if (capable(CAP_SYS_RESOURCE) ||
942             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
943                 return 0;
944
945         sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
946              sort_qd, NULL);
947
948         for (x = 0; x < al->al_qd_num; x++) {
949                 int force = NO_FORCE;
950                 qd = al->al_qd[x];
951                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
952                         force = FORCE;
953                 error = do_glock(qd, force, &al->al_qd_ghs[x]);
954                 if (error)
955                         break;
956         }
957
958         if (!error)
959                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
960         else {
961                 while (x--)
962                         gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
963                 gfs2_quota_unhold(ip);
964         }
965
966         return error;
967 }
968
969 static int need_sync(struct gfs2_quota_data *qd)
970 {
971         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
972         struct gfs2_tune *gt = &sdp->sd_tune;
973         s64 value;
974         unsigned int num, den;
975         int do_sync = 1;
976
977         if (!qd->qd_qb.qb_limit)
978                 return 0;
979
980         spin_lock(&qd_lru_lock);
981         value = qd->qd_change;
982         spin_unlock(&qd_lru_lock);
983
984         spin_lock(&gt->gt_spin);
985         num = gt->gt_quota_scale_num;
986         den = gt->gt_quota_scale_den;
987         spin_unlock(&gt->gt_spin);
988
989         if (value < 0)
990                 do_sync = 0;
991         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
992                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
993                 do_sync = 0;
994         else {
995                 value *= gfs2_jindex_size(sdp) * num;
996                 value = div_s64(value, den);
997                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
998                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
999                         do_sync = 0;
1000         }
1001
1002         return do_sync;
1003 }
1004
1005 void gfs2_quota_unlock(struct gfs2_inode *ip)
1006 {
1007         struct gfs2_alloc *al = ip->i_alloc;
1008         struct gfs2_quota_data *qda[4];
1009         unsigned int count = 0;
1010         unsigned int x;
1011
1012         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1013                 goto out;
1014
1015         for (x = 0; x < al->al_qd_num; x++) {
1016                 struct gfs2_quota_data *qd;
1017                 int sync;
1018
1019                 qd = al->al_qd[x];
1020                 sync = need_sync(qd);
1021
1022                 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
1023
1024                 if (sync && qd_trylock(qd))
1025                         qda[count++] = qd;
1026         }
1027
1028         if (count) {
1029                 do_sync(count, qda);
1030                 for (x = 0; x < count; x++)
1031                         qd_unlock(qda[x]);
1032         }
1033
1034 out:
1035         gfs2_quota_unhold(ip);
1036 }
1037
1038 #define MAX_LINE 256
1039
1040 static int print_message(struct gfs2_quota_data *qd, char *type)
1041 {
1042         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1043
1044         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1045                sdp->sd_fsname, type,
1046                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1047                qd->qd_id);
1048
1049         return 0;
1050 }
1051
1052 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1053 {
1054         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1055         struct gfs2_alloc *al = ip->i_alloc;
1056         struct gfs2_quota_data *qd;
1057         s64 value;
1058         unsigned int x;
1059         int error = 0;
1060
1061         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1062                 return 0;
1063
1064         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1065                 return 0;
1066
1067         for (x = 0; x < al->al_qd_num; x++) {
1068                 qd = al->al_qd[x];
1069
1070                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1071                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1072                         continue;
1073
1074                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1075                 spin_lock(&qd_lru_lock);
1076                 value += qd->qd_change;
1077                 spin_unlock(&qd_lru_lock);
1078
1079                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1080                         print_message(qd, "exceeded");
1081                         quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1082                                            USRQUOTA : GRPQUOTA, qd->qd_id,
1083                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1084
1085                         error = -EDQUOT;
1086                         break;
1087                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1088                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1089                            time_after_eq(jiffies, qd->qd_last_warn +
1090                                          gfs2_tune_get(sdp,
1091                                                 gt_quota_warn_period) * HZ)) {
1092                         quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1093                                            USRQUOTA : GRPQUOTA, 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_alloc *al = ip->i_alloc;
1107         struct gfs2_quota_data *qd;
1108         unsigned int x;
1109
1110         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1111                 return;
1112         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1113                 return;
1114
1115         for (x = 0; x < al->al_qd_num; x++) {
1116                 qd = al->al_qd[x];
1117
1118                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1119                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1120                         do_qc(qd, change);
1121                 }
1122         }
1123 }
1124
1125 int gfs2_quota_sync(struct super_block *sb, int type, int wait)
1126 {
1127         struct gfs2_sbd *sdp = sb->s_fs_info;
1128         struct gfs2_quota_data **qda;
1129         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1130         unsigned int num_qd;
1131         unsigned int x;
1132         int error = 0;
1133
1134         sdp->sd_quota_sync_gen++;
1135
1136         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1137         if (!qda)
1138                 return -ENOMEM;
1139
1140         do {
1141                 num_qd = 0;
1142
1143                 for (;;) {
1144                         error = qd_fish(sdp, qda + num_qd);
1145                         if (error || !qda[num_qd])
1146                                 break;
1147                         if (++num_qd == max_qd)
1148                                 break;
1149                 }
1150
1151                 if (num_qd) {
1152                         if (!error)
1153                                 error = do_sync(num_qd, qda);
1154                         if (!error)
1155                                 for (x = 0; x < num_qd; x++)
1156                                         qda[x]->qd_sync_gen =
1157                                                 sdp->sd_quota_sync_gen;
1158
1159                         for (x = 0; x < num_qd; x++)
1160                                 qd_unlock(qda[x]);
1161                 }
1162         } while (!error && num_qd == max_qd);
1163
1164         kfree(qda);
1165
1166         return error;
1167 }
1168
1169 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1170 {
1171         return gfs2_quota_sync(sb, type, 0);
1172 }
1173
1174 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1175 {
1176         struct gfs2_quota_data *qd;
1177         struct gfs2_holder q_gh;
1178         int error;
1179
1180         error = qd_get(sdp, user, id, &qd);
1181         if (error)
1182                 return error;
1183
1184         error = do_glock(qd, FORCE, &q_gh);
1185         if (!error)
1186                 gfs2_glock_dq_uninit(&q_gh);
1187
1188         qd_put(qd);
1189         return error;
1190 }
1191
1192 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1193 {
1194         const struct gfs2_quota_change *str = buf;
1195
1196         qc->qc_change = be64_to_cpu(str->qc_change);
1197         qc->qc_flags = be32_to_cpu(str->qc_flags);
1198         qc->qc_id = be32_to_cpu(str->qc_id);
1199 }
1200
1201 int gfs2_quota_init(struct gfs2_sbd *sdp)
1202 {
1203         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1204         u64 size = i_size_read(sdp->sd_qc_inode);
1205         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1206         unsigned int x, slot = 0;
1207         unsigned int found = 0;
1208         u64 dblock;
1209         u32 extlen = 0;
1210         int error;
1211
1212         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1213                 return -EIO;
1214
1215         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1216         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1217
1218         error = -ENOMEM;
1219
1220         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1221                                        sizeof(unsigned char *), GFP_NOFS);
1222         if (!sdp->sd_quota_bitmap)
1223                 return error;
1224
1225         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1226                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1227                 if (!sdp->sd_quota_bitmap[x])
1228                         goto fail;
1229         }
1230
1231         for (x = 0; x < blocks; x++) {
1232                 struct buffer_head *bh;
1233                 unsigned int y;
1234
1235                 if (!extlen) {
1236                         int new = 0;
1237                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1238                         if (error)
1239                                 goto fail;
1240                 }
1241                 error = -EIO;
1242                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1243                 if (!bh)
1244                         goto fail;
1245                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1246                         brelse(bh);
1247                         goto fail;
1248                 }
1249
1250                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1251                      y++, slot++) {
1252                         struct gfs2_quota_change_host qc;
1253                         struct gfs2_quota_data *qd;
1254
1255                         gfs2_quota_change_in(&qc, bh->b_data +
1256                                           sizeof(struct gfs2_meta_header) +
1257                                           y * sizeof(struct gfs2_quota_change));
1258                         if (!qc.qc_change)
1259                                 continue;
1260
1261                         error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1262                                          qc.qc_id, &qd);
1263                         if (error) {
1264                                 brelse(bh);
1265                                 goto fail;
1266                         }
1267
1268                         set_bit(QDF_CHANGE, &qd->qd_flags);
1269                         qd->qd_change = qc.qc_change;
1270                         qd->qd_slot = slot;
1271                         qd->qd_slot_count = 1;
1272
1273                         spin_lock(&qd_lru_lock);
1274                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1275                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1276                         atomic_inc(&sdp->sd_quota_count);
1277                         spin_unlock(&qd_lru_lock);
1278
1279                         found++;
1280                 }
1281
1282                 brelse(bh);
1283                 dblock++;
1284                 extlen--;
1285         }
1286
1287         if (found)
1288                 fs_info(sdp, "found %u quota changes\n", found);
1289
1290         return 0;
1291
1292 fail:
1293         gfs2_quota_cleanup(sdp);
1294         return error;
1295 }
1296
1297 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1298 {
1299         struct list_head *head = &sdp->sd_quota_list;
1300         struct gfs2_quota_data *qd;
1301         unsigned int x;
1302
1303         spin_lock(&qd_lru_lock);
1304         while (!list_empty(head)) {
1305                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1306
1307                 if (atomic_read(&qd->qd_count) > 1 ||
1308                     (atomic_read(&qd->qd_count) &&
1309                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1310                         list_move(&qd->qd_list, head);
1311                         spin_unlock(&qd_lru_lock);
1312                         schedule();
1313                         spin_lock(&qd_lru_lock);
1314                         continue;
1315                 }
1316
1317                 list_del(&qd->qd_list);
1318                 /* Also remove if this qd exists in the reclaim list */
1319                 if (!list_empty(&qd->qd_reclaim)) {
1320                         list_del_init(&qd->qd_reclaim);
1321                         atomic_dec(&qd_lru_count);
1322                 }
1323                 atomic_dec(&sdp->sd_quota_count);
1324                 spin_unlock(&qd_lru_lock);
1325
1326                 if (!atomic_read(&qd->qd_count)) {
1327                         gfs2_assert_warn(sdp, !qd->qd_change);
1328                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1329                 } else
1330                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1331                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1332
1333                 gfs2_glock_put(qd->qd_gl);
1334                 kmem_cache_free(gfs2_quotad_cachep, qd);
1335
1336                 spin_lock(&qd_lru_lock);
1337         }
1338         spin_unlock(&qd_lru_lock);
1339
1340         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1341
1342         if (sdp->sd_quota_bitmap) {
1343                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1344                         kfree(sdp->sd_quota_bitmap[x]);
1345                 kfree(sdp->sd_quota_bitmap);
1346         }
1347 }
1348
1349 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1350 {
1351         if (error == 0 || error == -EROFS)
1352                 return;
1353         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1354                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1355 }
1356
1357 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1358                                int (*fxn)(struct super_block *sb, int type),
1359                                unsigned long t, unsigned long *timeo,
1360                                unsigned int *new_timeo)
1361 {
1362         if (t >= *timeo) {
1363                 int error = fxn(sdp->sd_vfs, 0);
1364                 quotad_error(sdp, msg, error);
1365                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1366         } else {
1367                 *timeo -= t;
1368         }
1369 }
1370
1371 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1372 {
1373         struct gfs2_inode *ip;
1374
1375         while(1) {
1376                 ip = NULL;
1377                 spin_lock(&sdp->sd_trunc_lock);
1378                 if (!list_empty(&sdp->sd_trunc_list)) {
1379                         ip = list_entry(sdp->sd_trunc_list.next,
1380                                         struct gfs2_inode, i_trunc_list);
1381                         list_del_init(&ip->i_trunc_list);
1382                 }
1383                 spin_unlock(&sdp->sd_trunc_lock);
1384                 if (ip == NULL)
1385                         return;
1386                 gfs2_glock_finish_truncate(ip);
1387         }
1388 }
1389
1390 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1391         if (!sdp->sd_statfs_force_sync) {
1392                 sdp->sd_statfs_force_sync = 1;
1393                 wake_up(&sdp->sd_quota_wait);
1394         }
1395 }
1396
1397
1398 /**
1399  * gfs2_quotad - Write cached quota changes into the quota file
1400  * @sdp: Pointer to GFS2 superblock
1401  *
1402  */
1403
1404 int gfs2_quotad(void *data)
1405 {
1406         struct gfs2_sbd *sdp = data;
1407         struct gfs2_tune *tune = &sdp->sd_tune;
1408         unsigned long statfs_timeo = 0;
1409         unsigned long quotad_timeo = 0;
1410         unsigned long t = 0;
1411         DEFINE_WAIT(wait);
1412         int empty;
1413
1414         while (!kthread_should_stop()) {
1415
1416                 /* Update the master statfs file */
1417                 if (sdp->sd_statfs_force_sync) {
1418                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1419                         quotad_error(sdp, "statfs", error);
1420                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1421                 }
1422                 else
1423                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1424                                            &statfs_timeo,
1425                                            &tune->gt_statfs_quantum);
1426
1427                 /* Update quota file */
1428                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1429                                    &quotad_timeo, &tune->gt_quota_quantum);
1430
1431                 /* Check for & recover partially truncated inodes */
1432                 quotad_check_trunc_list(sdp);
1433
1434                 if (freezing(current))
1435                         refrigerator();
1436                 t = min(quotad_timeo, statfs_timeo);
1437
1438                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1439                 spin_lock(&sdp->sd_trunc_lock);
1440                 empty = list_empty(&sdp->sd_trunc_list);
1441                 spin_unlock(&sdp->sd_trunc_lock);
1442                 if (empty && !sdp->sd_statfs_force_sync)
1443                         t -= schedule_timeout(t);
1444                 else
1445                         t = 0;
1446                 finish_wait(&sdp->sd_quota_wait, &wait);
1447         }
1448
1449         return 0;
1450 }
1451
1452 static int gfs2_quota_get_xstate(struct super_block *sb,
1453                                  struct fs_quota_stat *fqs)
1454 {
1455         struct gfs2_sbd *sdp = sb->s_fs_info;
1456
1457         memset(fqs, 0, sizeof(struct fs_quota_stat));
1458         fqs->qs_version = FS_QSTAT_VERSION;
1459
1460         switch (sdp->sd_args.ar_quota) {
1461         case GFS2_QUOTA_ON:
1462                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1463                 /*FALLTHRU*/
1464         case GFS2_QUOTA_ACCOUNT:
1465                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1466                 break;
1467         case GFS2_QUOTA_OFF:
1468                 break;
1469         }
1470
1471         if (sdp->sd_quota_inode) {
1472                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1473                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1474         }
1475         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1476         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1477         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1478         return 0;
1479 }
1480
1481 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1482                           struct fs_disk_quota *fdq)
1483 {
1484         struct gfs2_sbd *sdp = sb->s_fs_info;
1485         struct gfs2_quota_lvb *qlvb;
1486         struct gfs2_quota_data *qd;
1487         struct gfs2_holder q_gh;
1488         int error;
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 (type == USRQUOTA)
1496                 type = QUOTA_USER;
1497         else if (type == GRPQUOTA)
1498                 type = QUOTA_GROUP;
1499         else
1500                 return -EINVAL;
1501
1502         error = qd_get(sdp, type, id, &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_lvb;
1510         fdq->d_version = FS_DQUOT_VERSION;
1511         fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1512         fdq->d_id = id;
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, int type, qid_t id,
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         struct gfs2_alloc *al;
1537         loff_t offset;
1538         int error;
1539
1540         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1541                 return -ESRCH; /* Crazy XFS error code */
1542
1543         switch(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 != id)
1561                 return -EINVAL;
1562
1563         error = qd_get(sdp, type, id, &qd);
1564         if (error)
1565                 return error;
1566
1567         mutex_lock(&ip->i_inode.i_mutex);
1568         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1569         if (error)
1570                 goto out_put;
1571         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1572         if (error)
1573                 goto out_q;
1574
1575         /* Check for existing entry, if none then alloc new blocks */
1576         error = update_qd(sdp, qd);
1577         if (error)
1578                 goto out_i;
1579
1580         /* If nothing has changed, this is a no-op */
1581         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1582             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1583                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1584
1585         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1586             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1587                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1588
1589         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1590             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1591                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1592
1593         if (fdq->d_fieldmask == 0)
1594                 goto out_i;
1595
1596         offset = qd2offset(qd);
1597         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1598         if (gfs2_is_stuffed(ip))
1599                 alloc_required = 1;
1600         if (alloc_required) {
1601                 al = gfs2_alloc_get(ip);
1602                 if (al == NULL)
1603                         goto out_i;
1604                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1605                                        &data_blocks, &ind_blocks);
1606                 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1607                 error = gfs2_inplace_reserve(ip);
1608                 if (error)
1609                         goto out_alloc;
1610                 blocks += gfs2_rg_blocks(al);
1611         }
1612
1613         /* Some quotas span block boundaries and can update two blocks,
1614            adding an extra block to the transaction to handle such quotas */
1615         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1616         if (error)
1617                 goto out_release;
1618
1619         /* Apply changes */
1620         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1621
1622         gfs2_trans_end(sdp);
1623 out_release:
1624         if (alloc_required) {
1625                 gfs2_inplace_release(ip);
1626 out_alloc:
1627                 gfs2_alloc_put(ip);
1628         }
1629 out_i:
1630         gfs2_glock_dq_uninit(&i_gh);
1631 out_q:
1632         gfs2_glock_dq_uninit(&q_gh);
1633 out_put:
1634         mutex_unlock(&ip->i_inode.i_mutex);
1635         qd_put(qd);
1636         return error;
1637 }
1638
1639 const struct quotactl_ops gfs2_quotactl_ops = {
1640         .quota_sync     = gfs2_quota_sync,
1641         .get_xstate     = gfs2_quota_get_xstate,
1642         .get_dqblk      = gfs2_get_dqblk,
1643         .set_dqblk      = gfs2_set_dqblk,
1644 };