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Linux 2.6.36-rc5
[linux-2.6/next.git] / fs / gfs2 / quota.c
blob1bc6b5695e6dfb34870810b87bd09c819f25c93f
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(struct shrinker *shrink, 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, *ptr;
641 struct gfs2_quota q, *qp;
642 int err, nbytes;
643 u64 size;
644
645 if (gfs2_is_stuffed(ip))
646 gfs2_unstuff_dinode(ip, NULL);
647
648 memset(&q, 0, sizeof(struct gfs2_quota));
649 err = gfs2_internal_read(ip, NULL, (char *)&q, &loc, sizeof(q));
650 if (err < 0)
651 return err;
652
653 err = -EIO;
654 qp = &q;
655 qp->qu_value = be64_to_cpu(qp->qu_value);
656 qp->qu_value += change;
657 qp->qu_value = cpu_to_be64(qp->qu_value);
658 qd->qd_qb.qb_value = qp->qu_value;
659 if (fdq) {
660 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
661 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit);
662 qd->qd_qb.qb_warn = qp->qu_warn;
663 }
664 if (fdq->d_fieldmask & FS_DQ_BHARD) {
665 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit);
666 qd->qd_qb.qb_limit = qp->qu_limit;
667 }
668 }
669
670 /* Write the quota into the quota file on disk */
671 ptr = qp;
672 nbytes = sizeof(struct gfs2_quota);
673 get_a_page:
674 page = grab_cache_page(mapping, index);
675 if (!page)
676 return -ENOMEM;
677
678 blocksize = inode->i_sb->s_blocksize;
679 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
680
681 if (!page_has_buffers(page))
682 create_empty_buffers(page, blocksize, 0);
683
684 bh = page_buffers(page);
685 pos = blocksize;
686 while (offset >= pos) {
687 bh = bh->b_this_page;
688 iblock++;
689 pos += blocksize;
690 }
691
692 if (!buffer_mapped(bh)) {
693 gfs2_block_map(inode, iblock, bh, 1);
694 if (!buffer_mapped(bh))
695 goto unlock_out;
696 /* If it's a newly allocated disk block for quota, zero it */
697 if (buffer_new(bh))
698 zero_user(page, pos - blocksize, bh->b_size);
699 }
700
701 if (PageUptodate(page))
702 set_buffer_uptodate(bh);
703
704 if (!buffer_uptodate(bh)) {
705 ll_rw_block(READ_META, 1, &bh);
706 wait_on_buffer(bh);
707 if (!buffer_uptodate(bh))
708 goto unlock_out;
709 }
710
711 gfs2_trans_add_bh(ip->i_gl, bh, 0);
712
713 kaddr = kmap_atomic(page, KM_USER0);
714 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
715 nbytes = PAGE_CACHE_SIZE - offset;
716 memcpy(kaddr + offset, ptr, nbytes);
717 flush_dcache_page(page);
718 kunmap_atomic(kaddr, KM_USER0);
719 unlock_page(page);
720 page_cache_release(page);
721
722 /* If quota straddles page boundary, we need to update the rest of the
723 * quota at the beginning of the next page */
724 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
725 ptr = ptr + nbytes;
726 nbytes = sizeof(struct gfs2_quota) - nbytes;
727 offset = 0;
728 index++;
729 goto get_a_page;
730 }
731
732 /* Update the disk inode timestamp and size (if extended) */
733 err = gfs2_meta_inode_buffer(ip, &dibh);
734 if (err)
735 goto out;
736
737 size = loc + sizeof(struct gfs2_quota);
738 if (size > inode->i_size) {
739 ip->i_disksize = size;
740 i_size_write(inode, size);
741 }
742 inode->i_mtime = inode->i_atime = CURRENT_TIME;
743 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
744 gfs2_dinode_out(ip, dibh->b_data);
745 brelse(dibh);
746 mark_inode_dirty(inode);
747
748 out:
749 return err;
750 unlock_out:
751 unlock_page(page);
752 page_cache_release(page);
753 return err;
754 }
755
756 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
757 {
758 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
759 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
760 unsigned int data_blocks, ind_blocks;
761 struct gfs2_holder *ghs, i_gh;
762 unsigned int qx, x;
763 struct gfs2_quota_data *qd;
764 loff_t offset;
765 unsigned int nalloc = 0, blocks;
766 struct gfs2_alloc *al = NULL;
767 int error;
768
769 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
770 &data_blocks, &ind_blocks);
771
772 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
773 if (!ghs)
774 return -ENOMEM;
775
776 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
777 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
778 for (qx = 0; qx < num_qd; qx++) {
779 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
780 GL_NOCACHE, &ghs[qx]);
781 if (error)
782 goto out;
783 }
784
785 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
786 if (error)
787 goto out;
788
789 for (x = 0; x < num_qd; x++) {
790 offset = qd2offset(qda[x]);
791 if (gfs2_write_alloc_required(ip, offset,
792 sizeof(struct gfs2_quota)))
793 nalloc++;
794 }
795
796 al = gfs2_alloc_get(ip);
797 if (!al) {
798 error = -ENOMEM;
799 goto out_gunlock;
800 }
801 /*
802 * 1 blk for unstuffing inode if stuffed. We add this extra
803 * block to the reservation unconditionally. If the inode
804 * doesn't need unstuffing, the block will be released to the
805 * rgrp since it won't be allocated during the transaction
806 */
807 al->al_requested = 1;
808 /* +3 in the end for unstuffing block, inode size update block
809 * and another block in case quota straddles page boundary and
810 * two blocks need to be updated instead of 1 */
811 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
812
813 if (nalloc)
814 al->al_requested += nalloc * (data_blocks + ind_blocks);
815 error = gfs2_inplace_reserve(ip);
816 if (error)
817 goto out_alloc;
818
819 if (nalloc)
820 blocks += al->al_rgd->rd_length + nalloc * ind_blocks + RES_STATFS;
821
822 error = gfs2_trans_begin(sdp, blocks, 0);
823 if (error)
824 goto out_ipres;
825
826 for (x = 0; x < num_qd; x++) {
827 qd = qda[x];
828 offset = qd2offset(qd);
829 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
830 if (error)
831 goto out_end_trans;
832
833 do_qc(qd, -qd->qd_change_sync);
834 }
835
836 error = 0;
837
838 out_end_trans:
839 gfs2_trans_end(sdp);
840 out_ipres:
841 gfs2_inplace_release(ip);
842 out_alloc:
843 gfs2_alloc_put(ip);
844 out_gunlock:
845 gfs2_glock_dq_uninit(&i_gh);
846 out:
847 while (qx--)
848 gfs2_glock_dq_uninit(&ghs[qx]);
849 mutex_unlock(&ip->i_inode.i_mutex);
850 kfree(ghs);
851 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
852 return error;
853 }
854
855 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
856 {
857 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
858 struct gfs2_quota q;
859 struct gfs2_quota_lvb *qlvb;
860 loff_t pos;
861 int error;
862
863 memset(&q, 0, sizeof(struct gfs2_quota));
864 pos = qd2offset(qd);
865 error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));
866 if (error < 0)
867 return error;
868
869 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
870 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
871 qlvb->__pad = 0;
872 qlvb->qb_limit = q.qu_limit;
873 qlvb->qb_warn = q.qu_warn;
874 qlvb->qb_value = q.qu_value;
875 qd->qd_qb = *qlvb;
876
877 return 0;
878 }
879
880 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
881 struct gfs2_holder *q_gh)
882 {
883 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
884 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
885 struct gfs2_holder i_gh;
886 int error;
887
888 restart:
889 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
890 if (error)
891 return error;
892
893 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
894
895 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
896 gfs2_glock_dq_uninit(q_gh);
897 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
898 GL_NOCACHE, q_gh);
899 if (error)
900 return error;
901
902 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
903 if (error)
904 goto fail;
905
906 error = update_qd(sdp, qd);
907 if (error)
908 goto fail_gunlock;
909
910 gfs2_glock_dq_uninit(&i_gh);
911 gfs2_glock_dq_uninit(q_gh);
912 force_refresh = 0;
913 goto restart;
914 }
915
916 return 0;
917
918 fail_gunlock:
919 gfs2_glock_dq_uninit(&i_gh);
920 fail:
921 gfs2_glock_dq_uninit(q_gh);
922 return error;
923 }
924
925 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
926 {
927 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
928 struct gfs2_alloc *al = ip->i_alloc;
929 unsigned int x;
930 int error = 0;
931
932 gfs2_quota_hold(ip, uid, gid);
933
934 if (capable(CAP_SYS_RESOURCE) ||
935 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
936 return 0;
937
938 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
939 sort_qd, NULL);
940
941 for (x = 0; x < al->al_qd_num; x++) {
942 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
943 if (error)
944 break;
945 }
946
947 if (!error)
948 set_bit(GIF_QD_LOCKED, &ip->i_flags);
949 else {
950 while (x--)
951 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
952 gfs2_quota_unhold(ip);
953 }
954
955 return error;
956 }
957
958 static int need_sync(struct gfs2_quota_data *qd)
959 {
960 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
961 struct gfs2_tune *gt = &sdp->sd_tune;
962 s64 value;
963 unsigned int num, den;
964 int do_sync = 1;
965
966 if (!qd->qd_qb.qb_limit)
967 return 0;
968
969 spin_lock(&qd_lru_lock);
970 value = qd->qd_change;
971 spin_unlock(&qd_lru_lock);
972
973 spin_lock(&gt->gt_spin);
974 num = gt->gt_quota_scale_num;
975 den = gt->gt_quota_scale_den;
976 spin_unlock(&gt->gt_spin);
977
978 if (value < 0)
979 do_sync = 0;
980 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
981 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
982 do_sync = 0;
983 else {
984 value *= gfs2_jindex_size(sdp) * num;
985 value = div_s64(value, den);
986 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
987 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
988 do_sync = 0;
989 }
990
991 return do_sync;
992 }
993
994 void gfs2_quota_unlock(struct gfs2_inode *ip)
995 {
996 struct gfs2_alloc *al = ip->i_alloc;
997 struct gfs2_quota_data *qda[4];
998 unsigned int count = 0;
999 unsigned int x;
1000
1001 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1002 goto out;
1003
1004 for (x = 0; x < al->al_qd_num; x++) {
1005 struct gfs2_quota_data *qd;
1006 int sync;
1007
1008 qd = al->al_qd[x];
1009 sync = need_sync(qd);
1010
1011 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
1012
1013 if (sync && qd_trylock(qd))
1014 qda[count++] = qd;
1015 }
1016
1017 if (count) {
1018 do_sync(count, qda);
1019 for (x = 0; x < count; x++)
1020 qd_unlock(qda[x]);
1021 }
1022
1023 out:
1024 gfs2_quota_unhold(ip);
1025 }
1026
1027 #define MAX_LINE 256
1028
1029 static int print_message(struct gfs2_quota_data *qd, char *type)
1030 {
1031 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1032
1033 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1034 sdp->sd_fsname, type,
1035 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1036 qd->qd_id);
1037
1038 return 0;
1039 }
1040
1041 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1042 {
1043 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1044 struct gfs2_alloc *al = ip->i_alloc;
1045 struct gfs2_quota_data *qd;
1046 s64 value;
1047 unsigned int x;
1048 int error = 0;
1049
1050 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1051 return 0;
1052
1053 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1054 return 0;
1055
1056 for (x = 0; x < al->al_qd_num; x++) {
1057 qd = al->al_qd[x];
1058
1059 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1060 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1061 continue;
1062
1063 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1064 spin_lock(&qd_lru_lock);
1065 value += qd->qd_change;
1066 spin_unlock(&qd_lru_lock);
1067
1068 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1069 print_message(qd, "exceeded");
1070 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1071 USRQUOTA : GRPQUOTA, qd->qd_id,
1072 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1073
1074 error = -EDQUOT;
1075 break;
1076 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1077 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1078 time_after_eq(jiffies, qd->qd_last_warn +
1079 gfs2_tune_get(sdp,
1080 gt_quota_warn_period) * HZ)) {
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_BSOFTWARN);
1084 error = print_message(qd, "warning");
1085 qd->qd_last_warn = jiffies;
1086 }
1087 }
1088
1089 return error;
1090 }
1091
1092 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1093 u32 uid, u32 gid)
1094 {
1095 struct gfs2_alloc *al = ip->i_alloc;
1096 struct gfs2_quota_data *qd;
1097 unsigned int x;
1098
1099 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1100 return;
1101 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1102 return;
1103
1104 for (x = 0; x < al->al_qd_num; x++) {
1105 qd = al->al_qd[x];
1106
1107 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1108 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1109 do_qc(qd, change);
1110 }
1111 }
1112 }
1113
1114 int gfs2_quota_sync(struct super_block *sb, int type, int wait)
1115 {
1116 struct gfs2_sbd *sdp = sb->s_fs_info;
1117 struct gfs2_quota_data **qda;
1118 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1119 unsigned int num_qd;
1120 unsigned int x;
1121 int error = 0;
1122
1123 sdp->sd_quota_sync_gen++;
1124
1125 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1126 if (!qda)
1127 return -ENOMEM;
1128
1129 do {
1130 num_qd = 0;
1131
1132 for (;;) {
1133 error = qd_fish(sdp, qda + num_qd);
1134 if (error || !qda[num_qd])
1135 break;
1136 if (++num_qd == max_qd)
1137 break;
1138 }
1139
1140 if (num_qd) {
1141 if (!error)
1142 error = do_sync(num_qd, qda);
1143 if (!error)
1144 for (x = 0; x < num_qd; x++)
1145 qda[x]->qd_sync_gen =
1146 sdp->sd_quota_sync_gen;
1147
1148 for (x = 0; x < num_qd; x++)
1149 qd_unlock(qda[x]);
1150 }
1151 } while (!error && num_qd == max_qd);
1152
1153 kfree(qda);
1154
1155 return error;
1156 }
1157
1158 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1159 {
1160 return gfs2_quota_sync(sb, type, 0);
1161 }
1162
1163 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1164 {
1165 struct gfs2_quota_data *qd;
1166 struct gfs2_holder q_gh;
1167 int error;
1168
1169 error = qd_get(sdp, user, id, &qd);
1170 if (error)
1171 return error;
1172
1173 error = do_glock(qd, FORCE, &q_gh);
1174 if (!error)
1175 gfs2_glock_dq_uninit(&q_gh);
1176
1177 qd_put(qd);
1178 return error;
1179 }
1180
1181 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1182 {
1183 const struct gfs2_quota_change *str = buf;
1184
1185 qc->qc_change = be64_to_cpu(str->qc_change);
1186 qc->qc_flags = be32_to_cpu(str->qc_flags);
1187 qc->qc_id = be32_to_cpu(str->qc_id);
1188 }
1189
1190 int gfs2_quota_init(struct gfs2_sbd *sdp)
1191 {
1192 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1193 unsigned int blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
1194 unsigned int x, slot = 0;
1195 unsigned int found = 0;
1196 u64 dblock;
1197 u32 extlen = 0;
1198 int error;
1199
1200 if (!ip->i_disksize || ip->i_disksize > (64 << 20) ||
1201 ip->i_disksize & (sdp->sd_sb.sb_bsize - 1)) {
1202 gfs2_consist_inode(ip);
1203 return -EIO;
1204 }
1205 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1206 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1207
1208 error = -ENOMEM;
1209
1210 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1211 sizeof(unsigned char *), GFP_NOFS);
1212 if (!sdp->sd_quota_bitmap)
1213 return error;
1214
1215 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1216 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1217 if (!sdp->sd_quota_bitmap[x])
1218 goto fail;
1219 }
1220
1221 for (x = 0; x < blocks; x++) {
1222 struct buffer_head *bh;
1223 unsigned int y;
1224
1225 if (!extlen) {
1226 int new = 0;
1227 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1228 if (error)
1229 goto fail;
1230 }
1231 error = -EIO;
1232 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1233 if (!bh)
1234 goto fail;
1235 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1236 brelse(bh);
1237 goto fail;
1238 }
1239
1240 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1241 y++, slot++) {
1242 struct gfs2_quota_change_host qc;
1243 struct gfs2_quota_data *qd;
1244
1245 gfs2_quota_change_in(&qc, bh->b_data +
1246 sizeof(struct gfs2_meta_header) +
1247 y * sizeof(struct gfs2_quota_change));
1248 if (!qc.qc_change)
1249 continue;
1250
1251 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1252 qc.qc_id, &qd);
1253 if (error) {
1254 brelse(bh);
1255 goto fail;
1256 }
1257
1258 set_bit(QDF_CHANGE, &qd->qd_flags);
1259 qd->qd_change = qc.qc_change;
1260 qd->qd_slot = slot;
1261 qd->qd_slot_count = 1;
1262
1263 spin_lock(&qd_lru_lock);
1264 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1265 list_add(&qd->qd_list, &sdp->sd_quota_list);
1266 atomic_inc(&sdp->sd_quota_count);
1267 spin_unlock(&qd_lru_lock);
1268
1269 found++;
1270 }
1271
1272 brelse(bh);
1273 dblock++;
1274 extlen--;
1275 }
1276
1277 if (found)
1278 fs_info(sdp, "found %u quota changes\n", found);
1279
1280 return 0;
1281
1282 fail:
1283 gfs2_quota_cleanup(sdp);
1284 return error;
1285 }
1286
1287 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1288 {
1289 struct list_head *head = &sdp->sd_quota_list;
1290 struct gfs2_quota_data *qd;
1291 unsigned int x;
1292
1293 spin_lock(&qd_lru_lock);
1294 while (!list_empty(head)) {
1295 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1296
1297 if (atomic_read(&qd->qd_count) > 1 ||
1298 (atomic_read(&qd->qd_count) &&
1299 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1300 list_move(&qd->qd_list, head);
1301 spin_unlock(&qd_lru_lock);
1302 schedule();
1303 spin_lock(&qd_lru_lock);
1304 continue;
1305 }
1306
1307 list_del(&qd->qd_list);
1308 /* Also remove if this qd exists in the reclaim list */
1309 if (!list_empty(&qd->qd_reclaim)) {
1310 list_del_init(&qd->qd_reclaim);
1311 atomic_dec(&qd_lru_count);
1312 }
1313 atomic_dec(&sdp->sd_quota_count);
1314 spin_unlock(&qd_lru_lock);
1315
1316 if (!atomic_read(&qd->qd_count)) {
1317 gfs2_assert_warn(sdp, !qd->qd_change);
1318 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1319 } else
1320 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1321 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1322
1323 gfs2_glock_put(qd->qd_gl);
1324 kmem_cache_free(gfs2_quotad_cachep, qd);
1325
1326 spin_lock(&qd_lru_lock);
1327 }
1328 spin_unlock(&qd_lru_lock);
1329
1330 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1331
1332 if (sdp->sd_quota_bitmap) {
1333 for (x = 0; x < sdp->sd_quota_chunks; x++)
1334 kfree(sdp->sd_quota_bitmap[x]);
1335 kfree(sdp->sd_quota_bitmap);
1336 }
1337 }
1338
1339 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1340 {
1341 if (error == 0 || error == -EROFS)
1342 return;
1343 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1344 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1345 }
1346
1347 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1348 int (*fxn)(struct super_block *sb, int type),
1349 unsigned long t, unsigned long *timeo,
1350 unsigned int *new_timeo)
1351 {
1352 if (t >= *timeo) {
1353 int error = fxn(sdp->sd_vfs, 0);
1354 quotad_error(sdp, msg, error);
1355 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1356 } else {
1357 *timeo -= t;
1358 }
1359 }
1360
1361 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1362 {
1363 struct gfs2_inode *ip;
1364
1365 while(1) {
1366 ip = NULL;
1367 spin_lock(&sdp->sd_trunc_lock);
1368 if (!list_empty(&sdp->sd_trunc_list)) {
1369 ip = list_entry(sdp->sd_trunc_list.next,
1370 struct gfs2_inode, i_trunc_list);
1371 list_del_init(&ip->i_trunc_list);
1372 }
1373 spin_unlock(&sdp->sd_trunc_lock);
1374 if (ip == NULL)
1375 return;
1376 gfs2_glock_finish_truncate(ip);
1377 }
1378 }
1379
1380 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1381 if (!sdp->sd_statfs_force_sync) {
1382 sdp->sd_statfs_force_sync = 1;
1383 wake_up(&sdp->sd_quota_wait);
1384 }
1385 }
1386
1387
1388 /**
1389 * gfs2_quotad - Write cached quota changes into the quota file
1390 * @sdp: Pointer to GFS2 superblock
1391 *
1392 */
1393
1394 int gfs2_quotad(void *data)
1395 {
1396 struct gfs2_sbd *sdp = data;
1397 struct gfs2_tune *tune = &sdp->sd_tune;
1398 unsigned long statfs_timeo = 0;
1399 unsigned long quotad_timeo = 0;
1400 unsigned long t = 0;
1401 DEFINE_WAIT(wait);
1402 int empty;
1403
1404 while (!kthread_should_stop()) {
1405
1406 /* Update the master statfs file */
1407 if (sdp->sd_statfs_force_sync) {
1408 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1409 quotad_error(sdp, "statfs", error);
1410 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1411 }
1412 else
1413 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1414 &statfs_timeo,
1415 &tune->gt_statfs_quantum);
1416
1417 /* Update quota file */
1418 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1419 &quotad_timeo, &tune->gt_quota_quantum);
1420
1421 /* Check for & recover partially truncated inodes */
1422 quotad_check_trunc_list(sdp);
1423
1424 if (freezing(current))
1425 refrigerator();
1426 t = min(quotad_timeo, statfs_timeo);
1427
1428 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1429 spin_lock(&sdp->sd_trunc_lock);
1430 empty = list_empty(&sdp->sd_trunc_list);
1431 spin_unlock(&sdp->sd_trunc_lock);
1432 if (empty && !sdp->sd_statfs_force_sync)
1433 t -= schedule_timeout(t);
1434 else
1435 t = 0;
1436 finish_wait(&sdp->sd_quota_wait, &wait);
1437 }
1438
1439 return 0;
1440 }
1441
1442 static int gfs2_quota_get_xstate(struct super_block *sb,
1443 struct fs_quota_stat *fqs)
1444 {
1445 struct gfs2_sbd *sdp = sb->s_fs_info;
1446
1447 memset(fqs, 0, sizeof(struct fs_quota_stat));
1448 fqs->qs_version = FS_QSTAT_VERSION;
1449
1450 switch (sdp->sd_args.ar_quota) {
1451 case GFS2_QUOTA_ON:
1452 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1453 /*FALLTHRU*/
1454 case GFS2_QUOTA_ACCOUNT:
1455 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1456 break;
1457 case GFS2_QUOTA_OFF:
1458 break;
1459 }
1460
1461 if (sdp->sd_quota_inode) {
1462 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1463 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1464 }
1465 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1466 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1467 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1468 return 0;
1469 }
1470
1471 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1472 struct fs_disk_quota *fdq)
1473 {
1474 struct gfs2_sbd *sdp = sb->s_fs_info;
1475 struct gfs2_quota_lvb *qlvb;
1476 struct gfs2_quota_data *qd;
1477 struct gfs2_holder q_gh;
1478 int error;
1479
1480 memset(fdq, 0, sizeof(struct fs_disk_quota));
1481
1482 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1483 return -ESRCH; /* Crazy XFS error code */
1484
1485 if (type == USRQUOTA)
1486 type = QUOTA_USER;
1487 else if (type == GRPQUOTA)
1488 type = QUOTA_GROUP;
1489 else
1490 return -EINVAL;
1491
1492 error = qd_get(sdp, type, id, &qd);
1493 if (error)
1494 return error;
1495 error = do_glock(qd, FORCE, &q_gh);
1496 if (error)
1497 goto out;
1498
1499 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1500 fdq->d_version = FS_DQUOT_VERSION;
1501 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1502 fdq->d_id = id;
1503 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit);
1504 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn);
1505 fdq->d_bcount = be64_to_cpu(qlvb->qb_value);
1506
1507 gfs2_glock_dq_uninit(&q_gh);
1508 out:
1509 qd_put(qd);
1510 return error;
1511 }
1512
1513 /* GFS2 only supports a subset of the XFS fields */
1514 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD)
1515
1516 static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id,
1517 struct fs_disk_quota *fdq)
1518 {
1519 struct gfs2_sbd *sdp = sb->s_fs_info;
1520 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1521 struct gfs2_quota_data *qd;
1522 struct gfs2_holder q_gh, i_gh;
1523 unsigned int data_blocks, ind_blocks;
1524 unsigned int blocks = 0;
1525 int alloc_required;
1526 struct gfs2_alloc *al;
1527 loff_t offset;
1528 int error;
1529
1530 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1531 return -ESRCH; /* Crazy XFS error code */
1532
1533 switch(type) {
1534 case USRQUOTA:
1535 type = QUOTA_USER;
1536 if (fdq->d_flags != FS_USER_QUOTA)
1537 return -EINVAL;
1538 break;
1539 case GRPQUOTA:
1540 type = QUOTA_GROUP;
1541 if (fdq->d_flags != FS_GROUP_QUOTA)
1542 return -EINVAL;
1543 break;
1544 default:
1545 return -EINVAL;
1546 }
1547
1548 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1549 return -EINVAL;
1550 if (fdq->d_id != id)
1551 return -EINVAL;
1552
1553 error = qd_get(sdp, type, id, &qd);
1554 if (error)
1555 return error;
1556
1557 mutex_lock(&ip->i_inode.i_mutex);
1558 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1559 if (error)
1560 goto out_put;
1561 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1562 if (error)
1563 goto out_q;
1564
1565 /* Check for existing entry, if none then alloc new blocks */
1566 error = update_qd(sdp, qd);
1567 if (error)
1568 goto out_i;
1569
1570 /* If nothing has changed, this is a no-op */
1571 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1572 (fdq->d_blk_softlimit == be64_to_cpu(qd->qd_qb.qb_warn)))
1573 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1574 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1575 (fdq->d_blk_hardlimit == be64_to_cpu(qd->qd_qb.qb_limit)))
1576 fdq->d_fieldmask ^= FS_DQ_BHARD;
1577 if (fdq->d_fieldmask == 0)
1578 goto out_i;
1579
1580 offset = qd2offset(qd);
1581 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1582 if (alloc_required) {
1583 al = gfs2_alloc_get(ip);
1584 if (al == NULL)
1585 goto out_i;
1586 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1587 &data_blocks, &ind_blocks);
1588 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1589 error = gfs2_inplace_reserve(ip);
1590 if (error)
1591 goto out_alloc;
1592 }
1593
1594 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0);
1595 if (error)
1596 goto out_release;
1597
1598 /* Apply changes */
1599 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1600
1601 gfs2_trans_end(sdp);
1602 out_release:
1603 if (alloc_required) {
1604 gfs2_inplace_release(ip);
1605 out_alloc:
1606 gfs2_alloc_put(ip);
1607 }
1608 out_i:
1609 gfs2_glock_dq_uninit(&i_gh);
1610 out_q:
1611 gfs2_glock_dq_uninit(&q_gh);
1612 out_put:
1613 mutex_unlock(&ip->i_inode.i_mutex);
1614 qd_put(qd);
1615 return error;
1616 }
1617
1618 const struct quotactl_ops gfs2_quotactl_ops = {
1619 .quota_sync = gfs2_quota_sync,
1620 .get_xstate = gfs2_quota_get_xstate,
1621 .get_dqblk = gfs2_get_dqblk,
1622 .set_dqblk = gfs2_set_dqblk,
1623 };
1624
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