GFS2: Wait for unlock completion on umount
[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/spinlock.h>
42 #include <linux/completion.h>
43 #include <linux/buffer_head.h>
44 #include <linux/sort.h>
45 #include <linux/fs.h>
46 #include <linux/bio.h>
47 #include <linux/gfs2_ondisk.h>
48 #include <linux/kthread.h>
49 #include <linux/freezer.h>
50 #include <linux/quota.h>
51 #include <linux/dqblk_xfs.h>
52
53 #include "gfs2.h"
54 #include "incore.h"
55 #include "bmap.h"
56 #include "glock.h"
57 #include "glops.h"
58 #include "log.h"
59 #include "meta_io.h"
60 #include "quota.h"
61 #include "rgrp.h"
62 #include "super.h"
63 #include "trans.h"
64 #include "inode.h"
65 #include "util.h"
66
67 #define QUOTA_USER 1
68 #define QUOTA_GROUP 0
69
70 struct gfs2_quota_change_host {
71         u64 qc_change;
72         u32 qc_flags; /* GFS2_QCF_... */
73         u32 qc_id;
74 };
75
76 static LIST_HEAD(qd_lru_list);
77 static atomic_t qd_lru_count = ATOMIC_INIT(0);
78 static DEFINE_SPINLOCK(qd_lru_lock);
79
80 int gfs2_shrink_qd_memory(int nr, gfp_t gfp_mask)
81 {
82         struct gfs2_quota_data *qd;
83         struct gfs2_sbd *sdp;
84
85         if (nr == 0)
86                 goto out;
87
88         if (!(gfp_mask & __GFP_FS))
89                 return -1;
90
91         spin_lock(&qd_lru_lock);
92         while (nr && !list_empty(&qd_lru_list)) {
93                 qd = list_entry(qd_lru_list.next,
94                                 struct gfs2_quota_data, qd_reclaim);
95                 sdp = qd->qd_gl->gl_sbd;
96
97                 /* Free from the filesystem-specific list */
98                 list_del(&qd->qd_list);
99
100                 gfs2_assert_warn(sdp, !qd->qd_change);
101                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
102                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
103
104                 gfs2_glock_put(qd->qd_gl);
105                 atomic_dec(&sdp->sd_quota_count);
106
107                 /* Delete it from the common reclaim list */
108                 list_del_init(&qd->qd_reclaim);
109                 atomic_dec(&qd_lru_count);
110                 spin_unlock(&qd_lru_lock);
111                 kmem_cache_free(gfs2_quotad_cachep, qd);
112                 spin_lock(&qd_lru_lock);
113                 nr--;
114         }
115         spin_unlock(&qd_lru_lock);
116
117 out:
118         return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
119 }
120
121 static u64 qd2offset(struct gfs2_quota_data *qd)
122 {
123         u64 offset;
124
125         offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
126         offset *= sizeof(struct gfs2_quota);
127
128         return offset;
129 }
130
131 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
132                     struct gfs2_quota_data **qdp)
133 {
134         struct gfs2_quota_data *qd;
135         int error;
136
137         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
138         if (!qd)
139                 return -ENOMEM;
140
141         atomic_set(&qd->qd_count, 1);
142         qd->qd_id = id;
143         if (user)
144                 set_bit(QDF_USER, &qd->qd_flags);
145         qd->qd_slot = -1;
146         INIT_LIST_HEAD(&qd->qd_reclaim);
147
148         error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
149                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
150         if (error)
151                 goto fail;
152
153         *qdp = qd;
154
155         return 0;
156
157 fail:
158         kmem_cache_free(gfs2_quotad_cachep, qd);
159         return error;
160 }
161
162 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
163                   struct gfs2_quota_data **qdp)
164 {
165         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
166         int error, found;
167
168         *qdp = NULL;
169
170         for (;;) {
171                 found = 0;
172                 spin_lock(&qd_lru_lock);
173                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
174                         if (qd->qd_id == id &&
175                             !test_bit(QDF_USER, &qd->qd_flags) == !user) {
176                                 if (!atomic_read(&qd->qd_count) &&
177                                     !list_empty(&qd->qd_reclaim)) {
178                                         /* Remove it from reclaim list */
179                                         list_del_init(&qd->qd_reclaim);
180                                         atomic_dec(&qd_lru_count);
181                                 }
182                                 atomic_inc(&qd->qd_count);
183                                 found = 1;
184                                 break;
185                         }
186                 }
187
188                 if (!found)
189                         qd = NULL;
190
191                 if (!qd && new_qd) {
192                         qd = new_qd;
193                         list_add(&qd->qd_list, &sdp->sd_quota_list);
194                         atomic_inc(&sdp->sd_quota_count);
195                         new_qd = NULL;
196                 }
197
198                 spin_unlock(&qd_lru_lock);
199
200                 if (qd) {
201                         if (new_qd) {
202                                 gfs2_glock_put(new_qd->qd_gl);
203                                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
204                         }
205                         *qdp = qd;
206                         return 0;
207                 }
208
209                 error = qd_alloc(sdp, user, id, &new_qd);
210                 if (error)
211                         return error;
212         }
213 }
214
215 static void qd_hold(struct gfs2_quota_data *qd)
216 {
217         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
218         gfs2_assert(sdp, atomic_read(&qd->qd_count));
219         atomic_inc(&qd->qd_count);
220 }
221
222 static void qd_put(struct gfs2_quota_data *qd)
223 {
224         if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
225                 /* Add to the reclaim list */
226                 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
227                 atomic_inc(&qd_lru_count);
228                 spin_unlock(&qd_lru_lock);
229         }
230 }
231
232 static int slot_get(struct gfs2_quota_data *qd)
233 {
234         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
235         unsigned int c, o = 0, b;
236         unsigned char byte = 0;
237
238         spin_lock(&qd_lru_lock);
239
240         if (qd->qd_slot_count++) {
241                 spin_unlock(&qd_lru_lock);
242                 return 0;
243         }
244
245         for (c = 0; c < sdp->sd_quota_chunks; c++)
246                 for (o = 0; o < PAGE_SIZE; o++) {
247                         byte = sdp->sd_quota_bitmap[c][o];
248                         if (byte != 0xFF)
249                                 goto found;
250                 }
251
252         goto fail;
253
254 found:
255         for (b = 0; b < 8; b++)
256                 if (!(byte & (1 << b)))
257                         break;
258         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
259
260         if (qd->qd_slot >= sdp->sd_quota_slots)
261                 goto fail;
262
263         sdp->sd_quota_bitmap[c][o] |= 1 << b;
264
265         spin_unlock(&qd_lru_lock);
266
267         return 0;
268
269 fail:
270         qd->qd_slot_count--;
271         spin_unlock(&qd_lru_lock);
272         return -ENOSPC;
273 }
274
275 static void slot_hold(struct gfs2_quota_data *qd)
276 {
277         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
278
279         spin_lock(&qd_lru_lock);
280         gfs2_assert(sdp, qd->qd_slot_count);
281         qd->qd_slot_count++;
282         spin_unlock(&qd_lru_lock);
283 }
284
285 static void slot_put(struct gfs2_quota_data *qd)
286 {
287         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
288
289         spin_lock(&qd_lru_lock);
290         gfs2_assert(sdp, qd->qd_slot_count);
291         if (!--qd->qd_slot_count) {
292                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
293                 qd->qd_slot = -1;
294         }
295         spin_unlock(&qd_lru_lock);
296 }
297
298 static int bh_get(struct gfs2_quota_data *qd)
299 {
300         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
301         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
302         unsigned int block, offset;
303         struct buffer_head *bh;
304         int error;
305         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
306
307         mutex_lock(&sdp->sd_quota_mutex);
308
309         if (qd->qd_bh_count++) {
310                 mutex_unlock(&sdp->sd_quota_mutex);
311                 return 0;
312         }
313
314         block = qd->qd_slot / sdp->sd_qc_per_block;
315         offset = qd->qd_slot % sdp->sd_qc_per_block;
316
317         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
318         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
319         if (error)
320                 goto fail;
321         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
322         if (error)
323                 goto fail;
324         error = -EIO;
325         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
326                 goto fail_brelse;
327
328         qd->qd_bh = bh;
329         qd->qd_bh_qc = (struct gfs2_quota_change *)
330                 (bh->b_data + sizeof(struct gfs2_meta_header) +
331                  offset * sizeof(struct gfs2_quota_change));
332
333         mutex_unlock(&sdp->sd_quota_mutex);
334
335         return 0;
336
337 fail_brelse:
338         brelse(bh);
339 fail:
340         qd->qd_bh_count--;
341         mutex_unlock(&sdp->sd_quota_mutex);
342         return error;
343 }
344
345 static void bh_put(struct gfs2_quota_data *qd)
346 {
347         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
348
349         mutex_lock(&sdp->sd_quota_mutex);
350         gfs2_assert(sdp, qd->qd_bh_count);
351         if (!--qd->qd_bh_count) {
352                 brelse(qd->qd_bh);
353                 qd->qd_bh = NULL;
354                 qd->qd_bh_qc = NULL;
355         }
356         mutex_unlock(&sdp->sd_quota_mutex);
357 }
358
359 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
360 {
361         struct gfs2_quota_data *qd = NULL;
362         int error;
363         int found = 0;
364
365         *qdp = NULL;
366
367         if (sdp->sd_vfs->s_flags & MS_RDONLY)
368                 return 0;
369
370         spin_lock(&qd_lru_lock);
371
372         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
373                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
374                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
375                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
376                         continue;
377
378                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
379
380                 set_bit(QDF_LOCKED, &qd->qd_flags);
381                 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
382                 atomic_inc(&qd->qd_count);
383                 qd->qd_change_sync = qd->qd_change;
384                 gfs2_assert_warn(sdp, qd->qd_slot_count);
385                 qd->qd_slot_count++;
386                 found = 1;
387
388                 break;
389         }
390
391         if (!found)
392                 qd = NULL;
393
394         spin_unlock(&qd_lru_lock);
395
396         if (qd) {
397                 gfs2_assert_warn(sdp, qd->qd_change_sync);
398                 error = bh_get(qd);
399                 if (error) {
400                         clear_bit(QDF_LOCKED, &qd->qd_flags);
401                         slot_put(qd);
402                         qd_put(qd);
403                         return error;
404                 }
405         }
406
407         *qdp = qd;
408
409         return 0;
410 }
411
412 static int qd_trylock(struct gfs2_quota_data *qd)
413 {
414         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
415
416         if (sdp->sd_vfs->s_flags & MS_RDONLY)
417                 return 0;
418
419         spin_lock(&qd_lru_lock);
420
421         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
422             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
423                 spin_unlock(&qd_lru_lock);
424                 return 0;
425         }
426
427         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
428
429         set_bit(QDF_LOCKED, &qd->qd_flags);
430         gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
431         atomic_inc(&qd->qd_count);
432         qd->qd_change_sync = qd->qd_change;
433         gfs2_assert_warn(sdp, qd->qd_slot_count);
434         qd->qd_slot_count++;
435
436         spin_unlock(&qd_lru_lock);
437
438         gfs2_assert_warn(sdp, qd->qd_change_sync);
439         if (bh_get(qd)) {
440                 clear_bit(QDF_LOCKED, &qd->qd_flags);
441                 slot_put(qd);
442                 qd_put(qd);
443                 return 0;
444         }
445
446         return 1;
447 }
448
449 static void qd_unlock(struct gfs2_quota_data *qd)
450 {
451         gfs2_assert_warn(qd->qd_gl->gl_sbd,
452                          test_bit(QDF_LOCKED, &qd->qd_flags));
453         clear_bit(QDF_LOCKED, &qd->qd_flags);
454         bh_put(qd);
455         slot_put(qd);
456         qd_put(qd);
457 }
458
459 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
460                     struct gfs2_quota_data **qdp)
461 {
462         int error;
463
464         error = qd_get(sdp, user, id, qdp);
465         if (error)
466                 return error;
467
468         error = slot_get(*qdp);
469         if (error)
470                 goto fail;
471
472         error = bh_get(*qdp);
473         if (error)
474                 goto fail_slot;
475
476         return 0;
477
478 fail_slot:
479         slot_put(*qdp);
480 fail:
481         qd_put(*qdp);
482         return error;
483 }
484
485 static void qdsb_put(struct gfs2_quota_data *qd)
486 {
487         bh_put(qd);
488         slot_put(qd);
489         qd_put(qd);
490 }
491
492 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
493 {
494         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
495         struct gfs2_alloc *al = ip->i_alloc;
496         struct gfs2_quota_data **qd = al->al_qd;
497         int error;
498
499         if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
500             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
501                 return -EIO;
502
503         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
504                 return 0;
505
506         error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
507         if (error)
508                 goto out;
509         al->al_qd_num++;
510         qd++;
511
512         error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
513         if (error)
514                 goto out;
515         al->al_qd_num++;
516         qd++;
517
518         if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
519                 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
520                 if (error)
521                         goto out;
522                 al->al_qd_num++;
523                 qd++;
524         }
525
526         if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
527                 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
528                 if (error)
529                         goto out;
530                 al->al_qd_num++;
531                 qd++;
532         }
533
534 out:
535         if (error)
536                 gfs2_quota_unhold(ip);
537         return error;
538 }
539
540 void gfs2_quota_unhold(struct gfs2_inode *ip)
541 {
542         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
543         struct gfs2_alloc *al = ip->i_alloc;
544         unsigned int x;
545
546         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
547
548         for (x = 0; x < al->al_qd_num; x++) {
549                 qdsb_put(al->al_qd[x]);
550                 al->al_qd[x] = NULL;
551         }
552         al->al_qd_num = 0;
553 }
554
555 static int sort_qd(const void *a, const void *b)
556 {
557         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
558         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
559
560         if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
561             !test_bit(QDF_USER, &qd_b->qd_flags)) {
562                 if (test_bit(QDF_USER, &qd_a->qd_flags))
563                         return -1;
564                 else
565                         return 1;
566         }
567         if (qd_a->qd_id < qd_b->qd_id)
568                 return -1;
569         if (qd_a->qd_id > qd_b->qd_id)
570                 return 1;
571
572         return 0;
573 }
574
575 static void do_qc(struct gfs2_quota_data *qd, s64 change)
576 {
577         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
578         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
579         struct gfs2_quota_change *qc = qd->qd_bh_qc;
580         s64 x;
581
582         mutex_lock(&sdp->sd_quota_mutex);
583         gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
584
585         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
586                 qc->qc_change = 0;
587                 qc->qc_flags = 0;
588                 if (test_bit(QDF_USER, &qd->qd_flags))
589                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
590                 qc->qc_id = cpu_to_be32(qd->qd_id);
591         }
592
593         x = be64_to_cpu(qc->qc_change) + change;
594         qc->qc_change = cpu_to_be64(x);
595
596         spin_lock(&qd_lru_lock);
597         qd->qd_change = x;
598         spin_unlock(&qd_lru_lock);
599
600         if (!x) {
601                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
602                 clear_bit(QDF_CHANGE, &qd->qd_flags);
603                 qc->qc_flags = 0;
604                 qc->qc_id = 0;
605                 slot_put(qd);
606                 qd_put(qd);
607         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
608                 qd_hold(qd);
609                 slot_hold(qd);
610         }
611
612         mutex_unlock(&sdp->sd_quota_mutex);
613 }
614
615 /**
616  * gfs2_adjust_quota - adjust record of current block usage
617  * @ip: The quota inode
618  * @loc: Offset of the entry in the quota file
619  * @change: The amount of usage change to record
620  * @qd: The quota data
621  * @fdq: The updated limits to record
622  *
623  * This function was mostly borrowed from gfs2_block_truncate_page which was
624  * in turn mostly borrowed from ext3
625  *
626  * Returns: 0 or -ve on error
627  */
628
629 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
630                              s64 change, struct gfs2_quota_data *qd,
631                              struct fs_disk_quota *fdq)
632 {
633         struct inode *inode = &ip->i_inode;
634         struct address_space *mapping = inode->i_mapping;
635         unsigned long index = loc >> PAGE_CACHE_SHIFT;
636         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
637         unsigned blocksize, iblock, pos;
638         struct buffer_head *bh, *dibh;
639         struct page *page;
640         void *kaddr;
641         struct gfs2_quota *qp;
642         s64 value;
643         int err = -EIO;
644         u64 size;
645
646         if (gfs2_is_stuffed(ip))
647                 gfs2_unstuff_dinode(ip, NULL);
648         
649         page = grab_cache_page(mapping, index);
650         if (!page)
651                 return -ENOMEM;
652
653         blocksize = inode->i_sb->s_blocksize;
654         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
655
656         if (!page_has_buffers(page))
657                 create_empty_buffers(page, blocksize, 0);
658
659         bh = page_buffers(page);
660         pos = blocksize;
661         while (offset >= pos) {
662                 bh = bh->b_this_page;
663                 iblock++;
664                 pos += blocksize;
665         }
666
667         if (!buffer_mapped(bh)) {
668                 gfs2_block_map(inode, iblock, bh, 1);
669                 if (!buffer_mapped(bh))
670                         goto unlock;
671         }
672
673         if (PageUptodate(page))
674                 set_buffer_uptodate(bh);
675
676         if (!buffer_uptodate(bh)) {
677                 ll_rw_block(READ_META, 1, &bh);
678                 wait_on_buffer(bh);
679                 if (!buffer_uptodate(bh))
680                         goto unlock;
681         }
682
683         gfs2_trans_add_bh(ip->i_gl, bh, 0);
684
685         kaddr = kmap_atomic(page, KM_USER0);
686         qp = kaddr + offset;
687         value = (s64)be64_to_cpu(qp->qu_value) + change;
688         qp->qu_value = cpu_to_be64(value);
689         qd->qd_qb.qb_value = qp->qu_value;
690         if (fdq) {
691                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
692                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit);
693                         qd->qd_qb.qb_warn = qp->qu_warn;
694                 }
695                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
696                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit);
697                         qd->qd_qb.qb_limit = qp->qu_limit;
698                 }
699         }
700         flush_dcache_page(page);
701         kunmap_atomic(kaddr, KM_USER0);
702
703         err = gfs2_meta_inode_buffer(ip, &dibh);
704         if (err)
705                 goto unlock;
706
707         size = loc + sizeof(struct gfs2_quota);
708         if (size > inode->i_size) {
709                 ip->i_disksize = size;
710                 i_size_write(inode, size);
711         }
712         inode->i_mtime = inode->i_atime = CURRENT_TIME;
713         gfs2_trans_add_bh(ip->i_gl, dibh, 1);
714         gfs2_dinode_out(ip, dibh->b_data);
715         brelse(dibh);
716         mark_inode_dirty(inode);
717
718 unlock:
719         unlock_page(page);
720         page_cache_release(page);
721         return err;
722 }
723
724 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
725 {
726         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
727         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
728         unsigned int data_blocks, ind_blocks;
729         struct gfs2_holder *ghs, i_gh;
730         unsigned int qx, x;
731         struct gfs2_quota_data *qd;
732         loff_t offset;
733         unsigned int nalloc = 0, blocks;
734         struct gfs2_alloc *al = NULL;
735         int error;
736
737         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
738                               &data_blocks, &ind_blocks);
739
740         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
741         if (!ghs)
742                 return -ENOMEM;
743
744         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
745         mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
746         for (qx = 0; qx < num_qd; qx++) {
747                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
748                                            GL_NOCACHE, &ghs[qx]);
749                 if (error)
750                         goto out;
751         }
752
753         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
754         if (error)
755                 goto out;
756
757         for (x = 0; x < num_qd; x++) {
758                 int alloc_required;
759
760                 offset = qd2offset(qda[x]);
761                 error = gfs2_write_alloc_required(ip, offset,
762                                                   sizeof(struct gfs2_quota),
763                                                   &alloc_required);
764                 if (error)
765                         goto out_gunlock;
766                 if (alloc_required)
767                         nalloc++;
768         }
769
770         al = gfs2_alloc_get(ip);
771         if (!al) {
772                 error = -ENOMEM;
773                 goto out_gunlock;
774         }
775         /* 
776          * 1 blk for unstuffing inode if stuffed. We add this extra
777          * block to the reservation unconditionally. If the inode
778          * doesn't need unstuffing, the block will be released to the 
779          * rgrp since it won't be allocated during the transaction
780          */
781         al->al_requested = 1;
782         /* +1 in the end for block requested above for unstuffing */
783         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 1;
784
785         if (nalloc)
786                 al->al_requested += nalloc * (data_blocks + ind_blocks);                
787         error = gfs2_inplace_reserve(ip);
788         if (error)
789                 goto out_alloc;
790
791         if (nalloc)
792                 blocks += al->al_rgd->rd_length + nalloc * ind_blocks + RES_STATFS;
793
794         error = gfs2_trans_begin(sdp, blocks, 0);
795         if (error)
796                 goto out_ipres;
797
798         for (x = 0; x < num_qd; x++) {
799                 qd = qda[x];
800                 offset = qd2offset(qd);
801                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
802                 if (error)
803                         goto out_end_trans;
804
805                 do_qc(qd, -qd->qd_change_sync);
806         }
807
808         error = 0;
809
810 out_end_trans:
811         gfs2_trans_end(sdp);
812 out_ipres:
813         gfs2_inplace_release(ip);
814 out_alloc:
815         gfs2_alloc_put(ip);
816 out_gunlock:
817         gfs2_glock_dq_uninit(&i_gh);
818 out:
819         while (qx--)
820                 gfs2_glock_dq_uninit(&ghs[qx]);
821         mutex_unlock(&ip->i_inode.i_mutex);
822         kfree(ghs);
823         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
824         return error;
825 }
826
827 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
828 {
829         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
830         struct gfs2_quota q;
831         struct gfs2_quota_lvb *qlvb;
832         loff_t pos;
833         int error;
834
835         memset(&q, 0, sizeof(struct gfs2_quota));
836         pos = qd2offset(qd);
837         error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));
838         if (error < 0)
839                 return error;
840
841         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
842         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
843         qlvb->__pad = 0;
844         qlvb->qb_limit = q.qu_limit;
845         qlvb->qb_warn = q.qu_warn;
846         qlvb->qb_value = q.qu_value;
847         qd->qd_qb = *qlvb;
848
849         return 0;
850 }
851
852 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
853                     struct gfs2_holder *q_gh)
854 {
855         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
856         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
857         struct gfs2_holder i_gh;
858         int error;
859
860 restart:
861         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
862         if (error)
863                 return error;
864
865         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
866
867         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
868                 gfs2_glock_dq_uninit(q_gh);
869                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
870                                            GL_NOCACHE, q_gh);
871                 if (error)
872                         return error;
873
874                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
875                 if (error)
876                         goto fail;
877
878                 error = update_qd(sdp, qd);
879                 if (error)
880                         goto fail_gunlock;
881
882                 gfs2_glock_dq_uninit(&i_gh);
883                 gfs2_glock_dq_uninit(q_gh);
884                 force_refresh = 0;
885                 goto restart;
886         }
887
888         return 0;
889
890 fail_gunlock:
891         gfs2_glock_dq_uninit(&i_gh);
892 fail:
893         gfs2_glock_dq_uninit(q_gh);
894         return error;
895 }
896
897 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
898 {
899         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
900         struct gfs2_alloc *al = ip->i_alloc;
901         unsigned int x;
902         int error = 0;
903
904         gfs2_quota_hold(ip, uid, gid);
905
906         if (capable(CAP_SYS_RESOURCE) ||
907             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
908                 return 0;
909
910         sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
911              sort_qd, NULL);
912
913         for (x = 0; x < al->al_qd_num; x++) {
914                 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
915                 if (error)
916                         break;
917         }
918
919         if (!error)
920                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
921         else {
922                 while (x--)
923                         gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
924                 gfs2_quota_unhold(ip);
925         }
926
927         return error;
928 }
929
930 static int need_sync(struct gfs2_quota_data *qd)
931 {
932         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
933         struct gfs2_tune *gt = &sdp->sd_tune;
934         s64 value;
935         unsigned int num, den;
936         int do_sync = 1;
937
938         if (!qd->qd_qb.qb_limit)
939                 return 0;
940
941         spin_lock(&qd_lru_lock);
942         value = qd->qd_change;
943         spin_unlock(&qd_lru_lock);
944
945         spin_lock(&gt->gt_spin);
946         num = gt->gt_quota_scale_num;
947         den = gt->gt_quota_scale_den;
948         spin_unlock(&gt->gt_spin);
949
950         if (value < 0)
951                 do_sync = 0;
952         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
953                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
954                 do_sync = 0;
955         else {
956                 value *= gfs2_jindex_size(sdp) * num;
957                 value = div_s64(value, den);
958                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
959                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
960                         do_sync = 0;
961         }
962
963         return do_sync;
964 }
965
966 void gfs2_quota_unlock(struct gfs2_inode *ip)
967 {
968         struct gfs2_alloc *al = ip->i_alloc;
969         struct gfs2_quota_data *qda[4];
970         unsigned int count = 0;
971         unsigned int x;
972
973         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
974                 goto out;
975
976         for (x = 0; x < al->al_qd_num; x++) {
977                 struct gfs2_quota_data *qd;
978                 int sync;
979
980                 qd = al->al_qd[x];
981                 sync = need_sync(qd);
982
983                 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
984
985                 if (sync && qd_trylock(qd))
986                         qda[count++] = qd;
987         }
988
989         if (count) {
990                 do_sync(count, qda);
991                 for (x = 0; x < count; x++)
992                         qd_unlock(qda[x]);
993         }
994
995 out:
996         gfs2_quota_unhold(ip);
997 }
998
999 #define MAX_LINE 256
1000
1001 static int print_message(struct gfs2_quota_data *qd, char *type)
1002 {
1003         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1004
1005         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1006                sdp->sd_fsname, type,
1007                (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1008                qd->qd_id);
1009
1010         return 0;
1011 }
1012
1013 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1014 {
1015         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1016         struct gfs2_alloc *al = ip->i_alloc;
1017         struct gfs2_quota_data *qd;
1018         s64 value;
1019         unsigned int x;
1020         int error = 0;
1021
1022         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1023                 return 0;
1024
1025         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1026                 return 0;
1027
1028         for (x = 0; x < al->al_qd_num; x++) {
1029                 qd = al->al_qd[x];
1030
1031                 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1032                       (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1033                         continue;
1034
1035                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1036                 spin_lock(&qd_lru_lock);
1037                 value += qd->qd_change;
1038                 spin_unlock(&qd_lru_lock);
1039
1040                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1041                         print_message(qd, "exceeded");
1042                         quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1043                                            USRQUOTA : GRPQUOTA, qd->qd_id,
1044                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1045
1046                         error = -EDQUOT;
1047                         break;
1048                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1049                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1050                            time_after_eq(jiffies, qd->qd_last_warn +
1051                                          gfs2_tune_get(sdp,
1052                                                 gt_quota_warn_period) * HZ)) {
1053                         quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1054                                            USRQUOTA : GRPQUOTA, qd->qd_id,
1055                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1056                         error = print_message(qd, "warning");
1057                         qd->qd_last_warn = jiffies;
1058                 }
1059         }
1060
1061         return error;
1062 }
1063
1064 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1065                        u32 uid, u32 gid)
1066 {
1067         struct gfs2_alloc *al = ip->i_alloc;
1068         struct gfs2_quota_data *qd;
1069         unsigned int x;
1070
1071         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1072                 return;
1073         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1074                 return;
1075
1076         for (x = 0; x < al->al_qd_num; x++) {
1077                 qd = al->al_qd[x];
1078
1079                 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1080                     (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1081                         do_qc(qd, change);
1082                 }
1083         }
1084 }
1085
1086 int gfs2_quota_sync(struct super_block *sb, int type)
1087 {
1088         struct gfs2_sbd *sdp = sb->s_fs_info;
1089         struct gfs2_quota_data **qda;
1090         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1091         unsigned int num_qd;
1092         unsigned int x;
1093         int error = 0;
1094
1095         sdp->sd_quota_sync_gen++;
1096
1097         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1098         if (!qda)
1099                 return -ENOMEM;
1100
1101         do {
1102                 num_qd = 0;
1103
1104                 for (;;) {
1105                         error = qd_fish(sdp, qda + num_qd);
1106                         if (error || !qda[num_qd])
1107                                 break;
1108                         if (++num_qd == max_qd)
1109                                 break;
1110                 }
1111
1112                 if (num_qd) {
1113                         if (!error)
1114                                 error = do_sync(num_qd, qda);
1115                         if (!error)
1116                                 for (x = 0; x < num_qd; x++)
1117                                         qda[x]->qd_sync_gen =
1118                                                 sdp->sd_quota_sync_gen;
1119
1120                         for (x = 0; x < num_qd; x++)
1121                                 qd_unlock(qda[x]);
1122                 }
1123         } while (!error && num_qd == max_qd);
1124
1125         kfree(qda);
1126
1127         return error;
1128 }
1129
1130 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1131 {
1132         struct gfs2_quota_data *qd;
1133         struct gfs2_holder q_gh;
1134         int error;
1135
1136         error = qd_get(sdp, user, id, &qd);
1137         if (error)
1138                 return error;
1139
1140         error = do_glock(qd, FORCE, &q_gh);
1141         if (!error)
1142                 gfs2_glock_dq_uninit(&q_gh);
1143
1144         qd_put(qd);
1145         return error;
1146 }
1147
1148 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1149 {
1150         const struct gfs2_quota_change *str = buf;
1151
1152         qc->qc_change = be64_to_cpu(str->qc_change);
1153         qc->qc_flags = be32_to_cpu(str->qc_flags);
1154         qc->qc_id = be32_to_cpu(str->qc_id);
1155 }
1156
1157 int gfs2_quota_init(struct gfs2_sbd *sdp)
1158 {
1159         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1160         unsigned int blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
1161         unsigned int x, slot = 0;
1162         unsigned int found = 0;
1163         u64 dblock;
1164         u32 extlen = 0;
1165         int error;
1166
1167         if (!ip->i_disksize || ip->i_disksize > (64 << 20) ||
1168             ip->i_disksize & (sdp->sd_sb.sb_bsize - 1)) {
1169                 gfs2_consist_inode(ip);
1170                 return -EIO;
1171         }
1172         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1173         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1174
1175         error = -ENOMEM;
1176
1177         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1178                                        sizeof(unsigned char *), GFP_NOFS);
1179         if (!sdp->sd_quota_bitmap)
1180                 return error;
1181
1182         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1183                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1184                 if (!sdp->sd_quota_bitmap[x])
1185                         goto fail;
1186         }
1187
1188         for (x = 0; x < blocks; x++) {
1189                 struct buffer_head *bh;
1190                 unsigned int y;
1191
1192                 if (!extlen) {
1193                         int new = 0;
1194                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1195                         if (error)
1196                                 goto fail;
1197                 }
1198                 error = -EIO;
1199                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1200                 if (!bh)
1201                         goto fail;
1202                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1203                         brelse(bh);
1204                         goto fail;
1205                 }
1206
1207                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1208                      y++, slot++) {
1209                         struct gfs2_quota_change_host qc;
1210                         struct gfs2_quota_data *qd;
1211
1212                         gfs2_quota_change_in(&qc, bh->b_data +
1213                                           sizeof(struct gfs2_meta_header) +
1214                                           y * sizeof(struct gfs2_quota_change));
1215                         if (!qc.qc_change)
1216                                 continue;
1217
1218                         error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1219                                          qc.qc_id, &qd);
1220                         if (error) {
1221                                 brelse(bh);
1222                                 goto fail;
1223                         }
1224
1225                         set_bit(QDF_CHANGE, &qd->qd_flags);
1226                         qd->qd_change = qc.qc_change;
1227                         qd->qd_slot = slot;
1228                         qd->qd_slot_count = 1;
1229
1230                         spin_lock(&qd_lru_lock);
1231                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1232                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1233                         atomic_inc(&sdp->sd_quota_count);
1234                         spin_unlock(&qd_lru_lock);
1235
1236                         found++;
1237                 }
1238
1239                 brelse(bh);
1240                 dblock++;
1241                 extlen--;
1242         }
1243
1244         if (found)
1245                 fs_info(sdp, "found %u quota changes\n", found);
1246
1247         return 0;
1248
1249 fail:
1250         gfs2_quota_cleanup(sdp);
1251         return error;
1252 }
1253
1254 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1255 {
1256         struct list_head *head = &sdp->sd_quota_list;
1257         struct gfs2_quota_data *qd;
1258         unsigned int x;
1259
1260         spin_lock(&qd_lru_lock);
1261         while (!list_empty(head)) {
1262                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1263
1264                 if (atomic_read(&qd->qd_count) > 1 ||
1265                     (atomic_read(&qd->qd_count) &&
1266                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1267                         list_move(&qd->qd_list, head);
1268                         spin_unlock(&qd_lru_lock);
1269                         schedule();
1270                         spin_lock(&qd_lru_lock);
1271                         continue;
1272                 }
1273
1274                 list_del(&qd->qd_list);
1275                 /* Also remove if this qd exists in the reclaim list */
1276                 if (!list_empty(&qd->qd_reclaim)) {
1277                         list_del_init(&qd->qd_reclaim);
1278                         atomic_dec(&qd_lru_count);
1279                 }
1280                 atomic_dec(&sdp->sd_quota_count);
1281                 spin_unlock(&qd_lru_lock);
1282
1283                 if (!atomic_read(&qd->qd_count)) {
1284                         gfs2_assert_warn(sdp, !qd->qd_change);
1285                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1286                 } else
1287                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1288                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1289
1290                 gfs2_glock_put(qd->qd_gl);
1291                 kmem_cache_free(gfs2_quotad_cachep, qd);
1292
1293                 spin_lock(&qd_lru_lock);
1294         }
1295         spin_unlock(&qd_lru_lock);
1296
1297         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1298
1299         if (sdp->sd_quota_bitmap) {
1300                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1301                         kfree(sdp->sd_quota_bitmap[x]);
1302                 kfree(sdp->sd_quota_bitmap);
1303         }
1304 }
1305
1306 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1307 {
1308         if (error == 0 || error == -EROFS)
1309                 return;
1310         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1311                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1312 }
1313
1314 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1315                                int (*fxn)(struct super_block *sb, int type),
1316                                unsigned long t, unsigned long *timeo,
1317                                unsigned int *new_timeo)
1318 {
1319         if (t >= *timeo) {
1320                 int error = fxn(sdp->sd_vfs, 0);
1321                 quotad_error(sdp, msg, error);
1322                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1323         } else {
1324                 *timeo -= t;
1325         }
1326 }
1327
1328 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1329 {
1330         struct gfs2_inode *ip;
1331
1332         while(1) {
1333                 ip = NULL;
1334                 spin_lock(&sdp->sd_trunc_lock);
1335                 if (!list_empty(&sdp->sd_trunc_list)) {
1336                         ip = list_entry(sdp->sd_trunc_list.next,
1337                                         struct gfs2_inode, i_trunc_list);
1338                         list_del_init(&ip->i_trunc_list);
1339                 }
1340                 spin_unlock(&sdp->sd_trunc_lock);
1341                 if (ip == NULL)
1342                         return;
1343                 gfs2_glock_finish_truncate(ip);
1344         }
1345 }
1346
1347 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1348         if (!sdp->sd_statfs_force_sync) {
1349                 sdp->sd_statfs_force_sync = 1;
1350                 wake_up(&sdp->sd_quota_wait);
1351         }
1352 }
1353
1354
1355 /**
1356  * gfs2_quotad - Write cached quota changes into the quota file
1357  * @sdp: Pointer to GFS2 superblock
1358  *
1359  */
1360
1361 int gfs2_quotad(void *data)
1362 {
1363         struct gfs2_sbd *sdp = data;
1364         struct gfs2_tune *tune = &sdp->sd_tune;
1365         unsigned long statfs_timeo = 0;
1366         unsigned long quotad_timeo = 0;
1367         unsigned long t = 0;
1368         DEFINE_WAIT(wait);
1369         int empty;
1370
1371         while (!kthread_should_stop()) {
1372
1373                 /* Update the master statfs file */
1374                 if (sdp->sd_statfs_force_sync) {
1375                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1376                         quotad_error(sdp, "statfs", error);
1377                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1378                 }
1379                 else
1380                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1381                                            &statfs_timeo,
1382                                            &tune->gt_statfs_quantum);
1383
1384                 /* Update quota file */
1385                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1386                                    &quotad_timeo, &tune->gt_quota_quantum);
1387
1388                 /* Check for & recover partially truncated inodes */
1389                 quotad_check_trunc_list(sdp);
1390
1391                 if (freezing(current))
1392                         refrigerator();
1393                 t = min(quotad_timeo, statfs_timeo);
1394
1395                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1396                 spin_lock(&sdp->sd_trunc_lock);
1397                 empty = list_empty(&sdp->sd_trunc_list);
1398                 spin_unlock(&sdp->sd_trunc_lock);
1399                 if (empty && !sdp->sd_statfs_force_sync)
1400                         t -= schedule_timeout(t);
1401                 else
1402                         t = 0;
1403                 finish_wait(&sdp->sd_quota_wait, &wait);
1404         }
1405
1406         return 0;
1407 }
1408
1409 static int gfs2_quota_get_xstate(struct super_block *sb,
1410                                  struct fs_quota_stat *fqs)
1411 {
1412         struct gfs2_sbd *sdp = sb->s_fs_info;
1413
1414         memset(fqs, 0, sizeof(struct fs_quota_stat));
1415         fqs->qs_version = FS_QSTAT_VERSION;
1416         if (sdp->sd_args.ar_quota == GFS2_QUOTA_ON)
1417                 fqs->qs_flags = (XFS_QUOTA_UDQ_ENFD | XFS_QUOTA_GDQ_ENFD);
1418         else if (sdp->sd_args.ar_quota == GFS2_QUOTA_ACCOUNT)
1419                 fqs->qs_flags = (XFS_QUOTA_UDQ_ACCT | XFS_QUOTA_GDQ_ACCT);
1420         if (sdp->sd_quota_inode) {
1421                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1422                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1423         }
1424         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1425         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1426         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1427         return 0;
1428 }
1429
1430 static int gfs2_xquota_get(struct super_block *sb, int type, qid_t id,
1431                            struct fs_disk_quota *fdq)
1432 {
1433         struct gfs2_sbd *sdp = sb->s_fs_info;
1434         struct gfs2_quota_lvb *qlvb;
1435         struct gfs2_quota_data *qd;
1436         struct gfs2_holder q_gh;
1437         int error;
1438
1439         memset(fdq, 0, sizeof(struct fs_disk_quota));
1440
1441         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1442                 return -ESRCH; /* Crazy XFS error code */
1443
1444         if (type == USRQUOTA)
1445                 type = QUOTA_USER;
1446         else if (type == GRPQUOTA)
1447                 type = QUOTA_GROUP;
1448         else
1449                 return -EINVAL;
1450
1451         error = qd_get(sdp, type, id, &qd);
1452         if (error)
1453                 return error;
1454         error = do_glock(qd, FORCE, &q_gh);
1455         if (error)
1456                 goto out;
1457
1458         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1459         fdq->d_version = FS_DQUOT_VERSION;
1460         fdq->d_flags = (type == QUOTA_USER) ? XFS_USER_QUOTA : XFS_GROUP_QUOTA;
1461         fdq->d_id = id;
1462         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit);
1463         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn);
1464         fdq->d_bcount = be64_to_cpu(qlvb->qb_value);
1465
1466         gfs2_glock_dq_uninit(&q_gh);
1467 out:
1468         qd_put(qd);
1469         return error;
1470 }
1471
1472 /* GFS2 only supports a subset of the XFS fields */
1473 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD)
1474
1475 static int gfs2_xquota_set(struct super_block *sb, int type, qid_t id,
1476                            struct fs_disk_quota *fdq)
1477 {
1478         struct gfs2_sbd *sdp = sb->s_fs_info;
1479         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1480         struct gfs2_quota_data *qd;
1481         struct gfs2_holder q_gh, i_gh;
1482         unsigned int data_blocks, ind_blocks;
1483         unsigned int blocks = 0;
1484         int alloc_required;
1485         struct gfs2_alloc *al;
1486         loff_t offset;
1487         int error;
1488
1489         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1490                 return -ESRCH; /* Crazy XFS error code */
1491
1492         switch(type) {
1493         case USRQUOTA:
1494                 type = QUOTA_USER;
1495                 if (fdq->d_flags != XFS_USER_QUOTA)
1496                         return -EINVAL;
1497                 break;
1498         case GRPQUOTA:
1499                 type = QUOTA_GROUP;
1500                 if (fdq->d_flags != XFS_GROUP_QUOTA)
1501                         return -EINVAL;
1502                 break;
1503         default:
1504                 return -EINVAL;
1505         }
1506
1507         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1508                 return -EINVAL;
1509         if (fdq->d_id != id)
1510                 return -EINVAL;
1511
1512         error = qd_get(sdp, type, id, &qd);
1513         if (error)
1514                 return error;
1515
1516         mutex_lock(&ip->i_inode.i_mutex);
1517         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1518         if (error)
1519                 goto out_put;
1520         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1521         if (error)
1522                 goto out_q;
1523
1524         /* Check for existing entry, if none then alloc new blocks */
1525         error = update_qd(sdp, qd);
1526         if (error)
1527                 goto out_i;
1528
1529         /* If nothing has changed, this is a no-op */
1530         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1531             (fdq->d_blk_softlimit == be64_to_cpu(qd->qd_qb.qb_warn)))
1532                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1533         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1534             (fdq->d_blk_hardlimit == be64_to_cpu(qd->qd_qb.qb_limit)))
1535                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1536         if (fdq->d_fieldmask == 0)
1537                 goto out_i;
1538
1539         offset = qd2offset(qd);
1540         error = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota),
1541                                           &alloc_required);
1542         if (error)
1543                 goto out_i;
1544         if (alloc_required) {
1545                 al = gfs2_alloc_get(ip);
1546                 if (al == NULL)
1547                         goto out_i;
1548                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1549                                        &data_blocks, &ind_blocks);
1550                 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1551                 error = gfs2_inplace_reserve(ip);
1552                 if (error)
1553                         goto out_alloc;
1554         }
1555
1556         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0);
1557         if (error)
1558                 goto out_release;
1559
1560         /* Apply changes */
1561         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1562
1563         gfs2_trans_end(sdp);
1564 out_release:
1565         if (alloc_required) {
1566                 gfs2_inplace_release(ip);
1567 out_alloc:
1568                 gfs2_alloc_put(ip);
1569         }
1570 out_i:
1571         gfs2_glock_dq_uninit(&i_gh);
1572 out_q:
1573         gfs2_glock_dq_uninit(&q_gh);
1574 out_put:
1575         mutex_unlock(&ip->i_inode.i_mutex);
1576         qd_put(qd);
1577         return error;
1578 }
1579
1580 const struct quotactl_ops gfs2_quotactl_ops = {
1581         .quota_sync     = gfs2_quota_sync,
1582         .get_xstate     = gfs2_quota_get_xstate,
1583         .get_xquota     = gfs2_xquota_get,
1584         .set_xquota     = gfs2_xquota_set,
1585 };
1586