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Merge remote-tracking branch 'mips/mips-for-linux-next'
[linux-2.6/next.git] / fs / gfs2 / quota.c
blob42e8d23bc0472007aa0178b7d049d952175b2391
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 /*
11 * Quota change tags are associated with each transaction that allocates or
12 * deallocates space. Those changes are accumulated locally to each node (in a
13 * per-node file) and then are periodically synced to the quota file. This
14 * avoids the bottleneck of constantly touching the quota file, but introduces
15 * fuzziness in the current usage value of IDs that are being used on different
16 * nodes in the cluster simultaneously. So, it is possible for a user on
17 * multiple nodes to overrun their quota, but that overrun is controlable.
18 * Since quota tags are part of transactions, there is no need for a quota check
19 * program to be run on node crashes or anything like that.
20 *
21 * There are couple of knobs that let the administrator manage the quota
22 * fuzziness. "quota_quantum" sets the maximum time a quota change can be
23 * sitting on one node before being synced to the quota file. (The default is
24 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency
25 * of quota file syncs increases as the user moves closer to their limit. The
26 * more frequent the syncs, the more accurate the quota enforcement, but that
27 * means that there is more contention between the nodes for the quota file.
28 * The default value is one. This sets the maximum theoretical quota overrun
29 * (with infinite node with infinite bandwidth) to twice the user's limit. (In
30 * practice, the maximum overrun you see should be much less.) A "quota_scale"
31 * number greater than one makes quota syncs more frequent and reduces the
32 * maximum overrun. Numbers less than one (but greater than zero) make quota
33 * syncs less frequent.
34 *
35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
36 * the quota file, so it is not being constantly read.
37 */
38
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/mm.h>
42 #include <linux/spinlock.h>
43 #include <linux/completion.h>
44 #include <linux/buffer_head.h>
45 #include <linux/sort.h>
46 #include <linux/fs.h>
47 #include <linux/bio.h>
48 #include <linux/gfs2_ondisk.h>
49 #include <linux/kthread.h>
50 #include <linux/freezer.h>
51 #include <linux/quota.h>
52 #include <linux/dqblk_xfs.h>
53
54 #include "gfs2.h"
55 #include "incore.h"
56 #include "bmap.h"
57 #include "glock.h"
58 #include "glops.h"
59 #include "log.h"
60 #include "meta_io.h"
61 #include "quota.h"
62 #include "rgrp.h"
63 #include "super.h"
64 #include "trans.h"
65 #include "inode.h"
66 #include "util.h"
67
68 #define QUOTA_USER 1
69 #define QUOTA_GROUP 0
70
71 struct gfs2_quota_change_host {
72 u64 qc_change;
73 u32 qc_flags; /* GFS2_QCF_... */
74 u32 qc_id;
75 };
76
77 static LIST_HEAD(qd_lru_list);
78 static atomic_t qd_lru_count = ATOMIC_INIT(0);
79 static DEFINE_SPINLOCK(qd_lru_lock);
80
81 int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc)
82 {
83 struct gfs2_quota_data *qd;
84 struct gfs2_sbd *sdp;
85 int nr_to_scan = sc->nr_to_scan;
86
87 if (nr_to_scan == 0)
88 goto out;
89
90 if (!(sc->gfp_mask & __GFP_FS))
91 return -1;
92
93 spin_lock(&qd_lru_lock);
94 while (nr_to_scan && !list_empty(&qd_lru_list)) {
95 qd = list_entry(qd_lru_list.next,
96 struct gfs2_quota_data, qd_reclaim);
97 sdp = qd->qd_gl->gl_sbd;
98
99 /* Free from the filesystem-specific list */
100 list_del(&qd->qd_list);
101
102 gfs2_assert_warn(sdp, !qd->qd_change);
103 gfs2_assert_warn(sdp, !qd->qd_slot_count);
104 gfs2_assert_warn(sdp, !qd->qd_bh_count);
105
106 gfs2_glock_put(qd->qd_gl);
107 atomic_dec(&sdp->sd_quota_count);
108
109 /* Delete it from the common reclaim list */
110 list_del_init(&qd->qd_reclaim);
111 atomic_dec(&qd_lru_count);
112 spin_unlock(&qd_lru_lock);
113 kmem_cache_free(gfs2_quotad_cachep, qd);
114 spin_lock(&qd_lru_lock);
115 nr_to_scan--;
116 }
117 spin_unlock(&qd_lru_lock);
118
119 out:
120 return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
121 }
122
123 static u64 qd2offset(struct gfs2_quota_data *qd)
124 {
125 u64 offset;
126
127 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
128 offset *= sizeof(struct gfs2_quota);
129
130 return offset;
131 }
132
133 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
134 struct gfs2_quota_data **qdp)
135 {
136 struct gfs2_quota_data *qd;
137 int error;
138
139 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
140 if (!qd)
141 return -ENOMEM;
142
143 atomic_set(&qd->qd_count, 1);
144 qd->qd_id = id;
145 if (user)
146 set_bit(QDF_USER, &qd->qd_flags);
147 qd->qd_slot = -1;
148 INIT_LIST_HEAD(&qd->qd_reclaim);
149
150 error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
151 &gfs2_quota_glops, CREATE, &qd->qd_gl);
152 if (error)
153 goto fail;
154
155 *qdp = qd;
156
157 return 0;
158
159 fail:
160 kmem_cache_free(gfs2_quotad_cachep, qd);
161 return error;
162 }
163
164 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
165 struct gfs2_quota_data **qdp)
166 {
167 struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
168 int error, found;
169
170 *qdp = NULL;
171
172 for (;;) {
173 found = 0;
174 spin_lock(&qd_lru_lock);
175 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
176 if (qd->qd_id == id &&
177 !test_bit(QDF_USER, &qd->qd_flags) == !user) {
178 if (!atomic_read(&qd->qd_count) &&
179 !list_empty(&qd->qd_reclaim)) {
180 /* Remove it from reclaim list */
181 list_del_init(&qd->qd_reclaim);
182 atomic_dec(&qd_lru_count);
183 }
184 atomic_inc(&qd->qd_count);
185 found = 1;
186 break;
187 }
188 }
189
190 if (!found)
191 qd = NULL;
192
193 if (!qd && new_qd) {
194 qd = new_qd;
195 list_add(&qd->qd_list, &sdp->sd_quota_list);
196 atomic_inc(&sdp->sd_quota_count);
197 new_qd = NULL;
198 }
199
200 spin_unlock(&qd_lru_lock);
201
202 if (qd) {
203 if (new_qd) {
204 gfs2_glock_put(new_qd->qd_gl);
205 kmem_cache_free(gfs2_quotad_cachep, new_qd);
206 }
207 *qdp = qd;
208 return 0;
209 }
210
211 error = qd_alloc(sdp, user, id, &new_qd);
212 if (error)
213 return error;
214 }
215 }
216
217 static void qd_hold(struct gfs2_quota_data *qd)
218 {
219 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
220 gfs2_assert(sdp, atomic_read(&qd->qd_count));
221 atomic_inc(&qd->qd_count);
222 }
223
224 static void qd_put(struct gfs2_quota_data *qd)
225 {
226 if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
227 /* Add to the reclaim list */
228 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
229 atomic_inc(&qd_lru_count);
230 spin_unlock(&qd_lru_lock);
231 }
232 }
233
234 static int slot_get(struct gfs2_quota_data *qd)
235 {
236 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
237 unsigned int c, o = 0, b;
238 unsigned char byte = 0;
239
240 spin_lock(&qd_lru_lock);
241
242 if (qd->qd_slot_count++) {
243 spin_unlock(&qd_lru_lock);
244 return 0;
245 }
246
247 for (c = 0; c < sdp->sd_quota_chunks; c++)
248 for (o = 0; o < PAGE_SIZE; o++) {
249 byte = sdp->sd_quota_bitmap[c][o];
250 if (byte != 0xFF)
251 goto found;
252 }
253
254 goto fail;
255
256 found:
257 for (b = 0; b < 8; b++)
258 if (!(byte & (1 << b)))
259 break;
260 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
261
262 if (qd->qd_slot >= sdp->sd_quota_slots)
263 goto fail;
264
265 sdp->sd_quota_bitmap[c][o] |= 1 << b;
266
267 spin_unlock(&qd_lru_lock);
268
269 return 0;
270
271 fail:
272 qd->qd_slot_count--;
273 spin_unlock(&qd_lru_lock);
274 return -ENOSPC;
275 }
276
277 static void slot_hold(struct gfs2_quota_data *qd)
278 {
279 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
280
281 spin_lock(&qd_lru_lock);
282 gfs2_assert(sdp, qd->qd_slot_count);
283 qd->qd_slot_count++;
284 spin_unlock(&qd_lru_lock);
285 }
286
287 static void slot_put(struct gfs2_quota_data *qd)
288 {
289 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
290
291 spin_lock(&qd_lru_lock);
292 gfs2_assert(sdp, qd->qd_slot_count);
293 if (!--qd->qd_slot_count) {
294 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
295 qd->qd_slot = -1;
296 }
297 spin_unlock(&qd_lru_lock);
298 }
299
300 static int bh_get(struct gfs2_quota_data *qd)
301 {
302 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
303 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
304 unsigned int block, offset;
305 struct buffer_head *bh;
306 int error;
307 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
308
309 mutex_lock(&sdp->sd_quota_mutex);
310
311 if (qd->qd_bh_count++) {
312 mutex_unlock(&sdp->sd_quota_mutex);
313 return 0;
314 }
315
316 block = qd->qd_slot / sdp->sd_qc_per_block;
317 offset = qd->qd_slot % sdp->sd_qc_per_block;
318
319 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
320 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
321 if (error)
322 goto fail;
323 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
324 if (error)
325 goto fail;
326 error = -EIO;
327 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
328 goto fail_brelse;
329
330 qd->qd_bh = bh;
331 qd->qd_bh_qc = (struct gfs2_quota_change *)
332 (bh->b_data + sizeof(struct gfs2_meta_header) +
333 offset * sizeof(struct gfs2_quota_change));
334
335 mutex_unlock(&sdp->sd_quota_mutex);
336
337 return 0;
338
339 fail_brelse:
340 brelse(bh);
341 fail:
342 qd->qd_bh_count--;
343 mutex_unlock(&sdp->sd_quota_mutex);
344 return error;
345 }
346
347 static void bh_put(struct gfs2_quota_data *qd)
348 {
349 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
350
351 mutex_lock(&sdp->sd_quota_mutex);
352 gfs2_assert(sdp, qd->qd_bh_count);
353 if (!--qd->qd_bh_count) {
354 brelse(qd->qd_bh);
355 qd->qd_bh = NULL;
356 qd->qd_bh_qc = NULL;
357 }
358 mutex_unlock(&sdp->sd_quota_mutex);
359 }
360
361 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
362 {
363 struct gfs2_quota_data *qd = NULL;
364 int error;
365 int found = 0;
366
367 *qdp = NULL;
368
369 if (sdp->sd_vfs->s_flags & MS_RDONLY)
370 return 0;
371
372 spin_lock(&qd_lru_lock);
373
374 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
375 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
376 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
377 qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
378 continue;
379
380 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
381
382 set_bit(QDF_LOCKED, &qd->qd_flags);
383 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
384 atomic_inc(&qd->qd_count);
385 qd->qd_change_sync = qd->qd_change;
386 gfs2_assert_warn(sdp, qd->qd_slot_count);
387 qd->qd_slot_count++;
388 found = 1;
389
390 break;
391 }
392
393 if (!found)
394 qd = NULL;
395
396 spin_unlock(&qd_lru_lock);
397
398 if (qd) {
399 gfs2_assert_warn(sdp, qd->qd_change_sync);
400 error = bh_get(qd);
401 if (error) {
402 clear_bit(QDF_LOCKED, &qd->qd_flags);
403 slot_put(qd);
404 qd_put(qd);
405 return error;
406 }
407 }
408
409 *qdp = qd;
410
411 return 0;
412 }
413
414 static int qd_trylock(struct gfs2_quota_data *qd)
415 {
416 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
417
418 if (sdp->sd_vfs->s_flags & MS_RDONLY)
419 return 0;
420
421 spin_lock(&qd_lru_lock);
422
423 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
424 !test_bit(QDF_CHANGE, &qd->qd_flags)) {
425 spin_unlock(&qd_lru_lock);
426 return 0;
427 }
428
429 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
430
431 set_bit(QDF_LOCKED, &qd->qd_flags);
432 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
433 atomic_inc(&qd->qd_count);
434 qd->qd_change_sync = qd->qd_change;
435 gfs2_assert_warn(sdp, qd->qd_slot_count);
436 qd->qd_slot_count++;
437
438 spin_unlock(&qd_lru_lock);
439
440 gfs2_assert_warn(sdp, qd->qd_change_sync);
441 if (bh_get(qd)) {
442 clear_bit(QDF_LOCKED, &qd->qd_flags);
443 slot_put(qd);
444 qd_put(qd);
445 return 0;
446 }
447
448 return 1;
449 }
450
451 static void qd_unlock(struct gfs2_quota_data *qd)
452 {
453 gfs2_assert_warn(qd->qd_gl->gl_sbd,
454 test_bit(QDF_LOCKED, &qd->qd_flags));
455 clear_bit(QDF_LOCKED, &qd->qd_flags);
456 bh_put(qd);
457 slot_put(qd);
458 qd_put(qd);
459 }
460
461 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
462 struct gfs2_quota_data **qdp)
463 {
464 int error;
465
466 error = qd_get(sdp, user, id, qdp);
467 if (error)
468 return error;
469
470 error = slot_get(*qdp);
471 if (error)
472 goto fail;
473
474 error = bh_get(*qdp);
475 if (error)
476 goto fail_slot;
477
478 return 0;
479
480 fail_slot:
481 slot_put(*qdp);
482 fail:
483 qd_put(*qdp);
484 return error;
485 }
486
487 static void qdsb_put(struct gfs2_quota_data *qd)
488 {
489 bh_put(qd);
490 slot_put(qd);
491 qd_put(qd);
492 }
493
494 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
495 {
496 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
497 struct gfs2_alloc *al = ip->i_alloc;
498 struct gfs2_quota_data **qd = al->al_qd;
499 int error;
500
501 if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
502 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
503 return -EIO;
504
505 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
506 return 0;
507
508 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
509 if (error)
510 goto out;
511 al->al_qd_num++;
512 qd++;
513
514 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
515 if (error)
516 goto out;
517 al->al_qd_num++;
518 qd++;
519
520 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
521 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
522 if (error)
523 goto out;
524 al->al_qd_num++;
525 qd++;
526 }
527
528 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
529 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
530 if (error)
531 goto out;
532 al->al_qd_num++;
533 qd++;
534 }
535
536 out:
537 if (error)
538 gfs2_quota_unhold(ip);
539 return error;
540 }
541
542 void gfs2_quota_unhold(struct gfs2_inode *ip)
543 {
544 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
545 struct gfs2_alloc *al = ip->i_alloc;
546 unsigned int x;
547
548 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
549
550 for (x = 0; x < al->al_qd_num; x++) {
551 qdsb_put(al->al_qd[x]);
552 al->al_qd[x] = NULL;
553 }
554 al->al_qd_num = 0;
555 }
556
557 static int sort_qd(const void *a, const void *b)
558 {
559 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
560 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
561
562 if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
563 !test_bit(QDF_USER, &qd_b->qd_flags)) {
564 if (test_bit(QDF_USER, &qd_a->qd_flags))
565 return -1;
566 else
567 return 1;
568 }
569 if (qd_a->qd_id < qd_b->qd_id)
570 return -1;
571 if (qd_a->qd_id > qd_b->qd_id)
572 return 1;
573
574 return 0;
575 }
576
577 static void do_qc(struct gfs2_quota_data *qd, s64 change)
578 {
579 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
580 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
581 struct gfs2_quota_change *qc = qd->qd_bh_qc;
582 s64 x;
583
584 mutex_lock(&sdp->sd_quota_mutex);
585 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
586
587 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
588 qc->qc_change = 0;
589 qc->qc_flags = 0;
590 if (test_bit(QDF_USER, &qd->qd_flags))
591 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
592 qc->qc_id = cpu_to_be32(qd->qd_id);
593 }
594
595 x = be64_to_cpu(qc->qc_change) + change;
596 qc->qc_change = cpu_to_be64(x);
597
598 spin_lock(&qd_lru_lock);
599 qd->qd_change = x;
600 spin_unlock(&qd_lru_lock);
601
602 if (!x) {
603 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
604 clear_bit(QDF_CHANGE, &qd->qd_flags);
605 qc->qc_flags = 0;
606 qc->qc_id = 0;
607 slot_put(qd);
608 qd_put(qd);
609 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
610 qd_hold(qd);
611 slot_hold(qd);
612 }
613
614 mutex_unlock(&sdp->sd_quota_mutex);
615 }
616
617 /**
618 * gfs2_adjust_quota - adjust record of current block usage
619 * @ip: The quota inode
620 * @loc: Offset of the entry in the quota file
621 * @change: The amount of usage change to record
622 * @qd: The quota data
623 * @fdq: The updated limits to record
624 *
625 * This function was mostly borrowed from gfs2_block_truncate_page which was
626 * in turn mostly borrowed from ext3
627 *
628 * Returns: 0 or -ve on error
629 */
630
631 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
632 s64 change, struct gfs2_quota_data *qd,
633 struct fs_disk_quota *fdq)
634 {
635 struct inode *inode = &ip->i_inode;
636 struct gfs2_sbd *sdp = GFS2_SB(inode);
637 struct address_space *mapping = inode->i_mapping;
638 unsigned long index = loc >> PAGE_CACHE_SHIFT;
639 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
640 unsigned blocksize, iblock, pos;
641 struct buffer_head *bh, *dibh;
642 struct page *page;
643 void *kaddr, *ptr;
644 struct gfs2_quota q, *qp;
645 int err, nbytes;
646 u64 size;
647
648 if (gfs2_is_stuffed(ip))
649 gfs2_unstuff_dinode(ip, NULL);
650
651 memset(&q, 0, sizeof(struct gfs2_quota));
652 err = gfs2_internal_read(ip, NULL, (char *)&q, &loc, sizeof(q));
653 if (err < 0)
654 return err;
655
656 err = -EIO;
657 qp = &q;
658 qp->qu_value = be64_to_cpu(qp->qu_value);
659 qp->qu_value += change;
660 qp->qu_value = cpu_to_be64(qp->qu_value);
661 qd->qd_qb.qb_value = qp->qu_value;
662 if (fdq) {
663 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
664 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
665 qd->qd_qb.qb_warn = qp->qu_warn;
666 }
667 if (fdq->d_fieldmask & FS_DQ_BHARD) {
668 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
669 qd->qd_qb.qb_limit = qp->qu_limit;
670 }
671 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
672 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
673 qd->qd_qb.qb_value = qp->qu_value;
674 }
675 }
676
677 /* Write the quota into the quota file on disk */
678 ptr = qp;
679 nbytes = sizeof(struct gfs2_quota);
680 get_a_page:
681 page = grab_cache_page(mapping, index);
682 if (!page)
683 return -ENOMEM;
684
685 blocksize = inode->i_sb->s_blocksize;
686 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
687
688 if (!page_has_buffers(page))
689 create_empty_buffers(page, blocksize, 0);
690
691 bh = page_buffers(page);
692 pos = blocksize;
693 while (offset >= pos) {
694 bh = bh->b_this_page;
695 iblock++;
696 pos += blocksize;
697 }
698
699 if (!buffer_mapped(bh)) {
700 gfs2_block_map(inode, iblock, bh, 1);
701 if (!buffer_mapped(bh))
702 goto unlock_out;
703 /* If it's a newly allocated disk block for quota, zero it */
704 if (buffer_new(bh))
705 zero_user(page, pos - blocksize, bh->b_size);
706 }
707
708 if (PageUptodate(page))
709 set_buffer_uptodate(bh);
710
711 if (!buffer_uptodate(bh)) {
712 ll_rw_block(READ_META, 1, &bh);
713 wait_on_buffer(bh);
714 if (!buffer_uptodate(bh))
715 goto unlock_out;
716 }
717
718 gfs2_trans_add_bh(ip->i_gl, bh, 0);
719
720 kaddr = kmap_atomic(page, KM_USER0);
721 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
722 nbytes = PAGE_CACHE_SIZE - offset;
723 memcpy(kaddr + offset, ptr, nbytes);
724 flush_dcache_page(page);
725 kunmap_atomic(kaddr, KM_USER0);
726 unlock_page(page);
727 page_cache_release(page);
728
729 /* If quota straddles page boundary, we need to update the rest of the
730 * quota at the beginning of the next page */
731 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
732 ptr = ptr + nbytes;
733 nbytes = sizeof(struct gfs2_quota) - nbytes;
734 offset = 0;
735 index++;
736 goto get_a_page;
737 }
738
739 /* Update the disk inode timestamp and size (if extended) */
740 err = gfs2_meta_inode_buffer(ip, &dibh);
741 if (err)
742 goto out;
743
744 size = loc + sizeof(struct gfs2_quota);
745 if (size > inode->i_size)
746 i_size_write(inode, size);
747 inode->i_mtime = inode->i_atime = CURRENT_TIME;
748 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
749 gfs2_dinode_out(ip, dibh->b_data);
750 brelse(dibh);
751 mark_inode_dirty(inode);
752
753 out:
754 return err;
755 unlock_out:
756 unlock_page(page);
757 page_cache_release(page);
758 return err;
759 }
760
761 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
762 {
763 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
764 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
765 unsigned int data_blocks, ind_blocks;
766 struct gfs2_holder *ghs, i_gh;
767 unsigned int qx, x;
768 struct gfs2_quota_data *qd;
769 loff_t offset;
770 unsigned int nalloc = 0, blocks;
771 struct gfs2_alloc *al = NULL;
772 int error;
773
774 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
775 &data_blocks, &ind_blocks);
776
777 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
778 if (!ghs)
779 return -ENOMEM;
780
781 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
782 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
783 for (qx = 0; qx < num_qd; qx++) {
784 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
785 GL_NOCACHE, &ghs[qx]);
786 if (error)
787 goto out;
788 }
789
790 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
791 if (error)
792 goto out;
793
794 for (x = 0; x < num_qd; x++) {
795 offset = qd2offset(qda[x]);
796 if (gfs2_write_alloc_required(ip, offset,
797 sizeof(struct gfs2_quota)))
798 nalloc++;
799 }
800
801 al = gfs2_alloc_get(ip);
802 if (!al) {
803 error = -ENOMEM;
804 goto out_gunlock;
805 }
806 /*
807 * 1 blk for unstuffing inode if stuffed. We add this extra
808 * block to the reservation unconditionally. If the inode
809 * doesn't need unstuffing, the block will be released to the
810 * rgrp since it won't be allocated during the transaction
811 */
812 al->al_requested = 1;
813 /* +3 in the end for unstuffing block, inode size update block
814 * and another block in case quota straddles page boundary and
815 * two blocks need to be updated instead of 1 */
816 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
817
818 if (nalloc)
819 al->al_requested += nalloc * (data_blocks + ind_blocks);
820 error = gfs2_inplace_reserve(ip);
821 if (error)
822 goto out_alloc;
823
824 if (nalloc)
825 blocks += gfs2_rg_blocks(al) + nalloc * ind_blocks + RES_STATFS;
826
827 error = gfs2_trans_begin(sdp, blocks, 0);
828 if (error)
829 goto out_ipres;
830
831 for (x = 0; x < num_qd; x++) {
832 qd = qda[x];
833 offset = qd2offset(qd);
834 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
835 if (error)
836 goto out_end_trans;
837
838 do_qc(qd, -qd->qd_change_sync);
839 set_bit(QDF_REFRESH, &qd->qd_flags);
840 }
841
842 error = 0;
843
844 out_end_trans:
845 gfs2_trans_end(sdp);
846 out_ipres:
847 gfs2_inplace_release(ip);
848 out_alloc:
849 gfs2_alloc_put(ip);
850 out_gunlock:
851 gfs2_glock_dq_uninit(&i_gh);
852 out:
853 while (qx--)
854 gfs2_glock_dq_uninit(&ghs[qx]);
855 mutex_unlock(&ip->i_inode.i_mutex);
856 kfree(ghs);
857 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
858 return error;
859 }
860
861 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
862 {
863 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
864 struct gfs2_quota q;
865 struct gfs2_quota_lvb *qlvb;
866 loff_t pos;
867 int error;
868
869 memset(&q, 0, sizeof(struct gfs2_quota));
870 pos = qd2offset(qd);
871 error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));
872 if (error < 0)
873 return error;
874
875 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
876 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
877 qlvb->__pad = 0;
878 qlvb->qb_limit = q.qu_limit;
879 qlvb->qb_warn = q.qu_warn;
880 qlvb->qb_value = q.qu_value;
881 qd->qd_qb = *qlvb;
882
883 return 0;
884 }
885
886 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
887 struct gfs2_holder *q_gh)
888 {
889 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
890 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
891 struct gfs2_holder i_gh;
892 int error;
893
894 restart:
895 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
896 if (error)
897 return error;
898
899 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
900
901 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
902 gfs2_glock_dq_uninit(q_gh);
903 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
904 GL_NOCACHE, q_gh);
905 if (error)
906 return error;
907
908 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
909 if (error)
910 goto fail;
911
912 error = update_qd(sdp, qd);
913 if (error)
914 goto fail_gunlock;
915
916 gfs2_glock_dq_uninit(&i_gh);
917 gfs2_glock_dq_uninit(q_gh);
918 force_refresh = 0;
919 goto restart;
920 }
921
922 return 0;
923
924 fail_gunlock:
925 gfs2_glock_dq_uninit(&i_gh);
926 fail:
927 gfs2_glock_dq_uninit(q_gh);
928 return error;
929 }
930
931 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
932 {
933 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
934 struct gfs2_alloc *al = ip->i_alloc;
935 struct gfs2_quota_data *qd;
936 unsigned int x;
937 int error = 0;
938
939 gfs2_quota_hold(ip, uid, gid);
940
941 if (capable(CAP_SYS_RESOURCE) ||
942 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
943 return 0;
944
945 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
946 sort_qd, NULL);
947
948 for (x = 0; x < al->al_qd_num; x++) {
949 int force = NO_FORCE;
950 qd = al->al_qd[x];
951 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
952 force = FORCE;
953 error = do_glock(qd, force, &al->al_qd_ghs[x]);
954 if (error)
955 break;
956 }
957
958 if (!error)
959 set_bit(GIF_QD_LOCKED, &ip->i_flags);
960 else {
961 while (x--)
962 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
963 gfs2_quota_unhold(ip);
964 }
965
966 return error;
967 }
968
969 static int need_sync(struct gfs2_quota_data *qd)
970 {
971 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
972 struct gfs2_tune *gt = &sdp->sd_tune;
973 s64 value;
974 unsigned int num, den;
975 int do_sync = 1;
976
977 if (!qd->qd_qb.qb_limit)
978 return 0;
979
980 spin_lock(&qd_lru_lock);
981 value = qd->qd_change;
982 spin_unlock(&qd_lru_lock);
983
984 spin_lock(&gt->gt_spin);
985 num = gt->gt_quota_scale_num;
986 den = gt->gt_quota_scale_den;
987 spin_unlock(&gt->gt_spin);
988
989 if (value < 0)
990 do_sync = 0;
991 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
992 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
993 do_sync = 0;
994 else {
995 value *= gfs2_jindex_size(sdp) * num;
996 value = div_s64(value, den);
997 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
998 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
999 do_sync = 0;
1000 }
1001
1002 return do_sync;
1003 }
1004
1005 void gfs2_quota_unlock(struct gfs2_inode *ip)
1006 {
1007 struct gfs2_alloc *al = ip->i_alloc;
1008 struct gfs2_quota_data *qda[4];
1009 unsigned int count = 0;
1010 unsigned int x;
1011
1012 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1013 goto out;
1014
1015 for (x = 0; x < al->al_qd_num; x++) {
1016 struct gfs2_quota_data *qd;
1017 int sync;
1018
1019 qd = al->al_qd[x];
1020 sync = need_sync(qd);
1021
1022 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
1023
1024 if (sync && qd_trylock(qd))
1025 qda[count++] = qd;
1026 }
1027
1028 if (count) {
1029 do_sync(count, qda);
1030 for (x = 0; x < count; x++)
1031 qd_unlock(qda[x]);
1032 }
1033
1034 out:
1035 gfs2_quota_unhold(ip);
1036 }
1037
1038 #define MAX_LINE 256
1039
1040 static int print_message(struct gfs2_quota_data *qd, char *type)
1041 {
1042 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1043
1044 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1045 sdp->sd_fsname, type,
1046 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1047 qd->qd_id);
1048
1049 return 0;
1050 }
1051
1052 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1053 {
1054 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1055 struct gfs2_alloc *al = ip->i_alloc;
1056 struct gfs2_quota_data *qd;
1057 s64 value;
1058 unsigned int x;
1059 int error = 0;
1060
1061 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1062 return 0;
1063
1064 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1065 return 0;
1066
1067 for (x = 0; x < al->al_qd_num; x++) {
1068 qd = al->al_qd[x];
1069
1070 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1071 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1072 continue;
1073
1074 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1075 spin_lock(&qd_lru_lock);
1076 value += qd->qd_change;
1077 spin_unlock(&qd_lru_lock);
1078
1079 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1080 print_message(qd, "exceeded");
1081 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1082 USRQUOTA : GRPQUOTA, qd->qd_id,
1083 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1084
1085 error = -EDQUOT;
1086 break;
1087 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1088 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1089 time_after_eq(jiffies, qd->qd_last_warn +
1090 gfs2_tune_get(sdp,
1091 gt_quota_warn_period) * HZ)) {
1092 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1093 USRQUOTA : GRPQUOTA, qd->qd_id,
1094 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1095 error = print_message(qd, "warning");
1096 qd->qd_last_warn = jiffies;
1097 }
1098 }
1099
1100 return error;
1101 }
1102
1103 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1104 u32 uid, u32 gid)
1105 {
1106 struct gfs2_alloc *al = ip->i_alloc;
1107 struct gfs2_quota_data *qd;
1108 unsigned int x;
1109
1110 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1111 return;
1112 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1113 return;
1114
1115 for (x = 0; x < al->al_qd_num; x++) {
1116 qd = al->al_qd[x];
1117
1118 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1119 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1120 do_qc(qd, change);
1121 }
1122 }
1123 }
1124
1125 int gfs2_quota_sync(struct super_block *sb, int type, int wait)
1126 {
1127 struct gfs2_sbd *sdp = sb->s_fs_info;
1128 struct gfs2_quota_data **qda;
1129 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1130 unsigned int num_qd;
1131 unsigned int x;
1132 int error = 0;
1133
1134 sdp->sd_quota_sync_gen++;
1135
1136 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1137 if (!qda)
1138 return -ENOMEM;
1139
1140 do {
1141 num_qd = 0;
1142
1143 for (;;) {
1144 error = qd_fish(sdp, qda + num_qd);
1145 if (error || !qda[num_qd])
1146 break;
1147 if (++num_qd == max_qd)
1148 break;
1149 }
1150
1151 if (num_qd) {
1152 if (!error)
1153 error = do_sync(num_qd, qda);
1154 if (!error)
1155 for (x = 0; x < num_qd; x++)
1156 qda[x]->qd_sync_gen =
1157 sdp->sd_quota_sync_gen;
1158
1159 for (x = 0; x < num_qd; x++)
1160 qd_unlock(qda[x]);
1161 }
1162 } while (!error && num_qd == max_qd);
1163
1164 kfree(qda);
1165
1166 return error;
1167 }
1168
1169 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1170 {
1171 return gfs2_quota_sync(sb, type, 0);
1172 }
1173
1174 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1175 {
1176 struct gfs2_quota_data *qd;
1177 struct gfs2_holder q_gh;
1178 int error;
1179
1180 error = qd_get(sdp, user, id, &qd);
1181 if (error)
1182 return error;
1183
1184 error = do_glock(qd, FORCE, &q_gh);
1185 if (!error)
1186 gfs2_glock_dq_uninit(&q_gh);
1187
1188 qd_put(qd);
1189 return error;
1190 }
1191
1192 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1193 {
1194 const struct gfs2_quota_change *str = buf;
1195
1196 qc->qc_change = be64_to_cpu(str->qc_change);
1197 qc->qc_flags = be32_to_cpu(str->qc_flags);
1198 qc->qc_id = be32_to_cpu(str->qc_id);
1199 }
1200
1201 int gfs2_quota_init(struct gfs2_sbd *sdp)
1202 {
1203 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1204 u64 size = i_size_read(sdp->sd_qc_inode);
1205 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1206 unsigned int x, slot = 0;
1207 unsigned int found = 0;
1208 u64 dblock;
1209 u32 extlen = 0;
1210 int error;
1211
1212 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1213 return -EIO;
1214
1215 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1216 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1217
1218 error = -ENOMEM;
1219
1220 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1221 sizeof(unsigned char *), GFP_NOFS);
1222 if (!sdp->sd_quota_bitmap)
1223 return error;
1224
1225 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1226 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1227 if (!sdp->sd_quota_bitmap[x])
1228 goto fail;
1229 }
1230
1231 for (x = 0; x < blocks; x++) {
1232 struct buffer_head *bh;
1233 unsigned int y;
1234
1235 if (!extlen) {
1236 int new = 0;
1237 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1238 if (error)
1239 goto fail;
1240 }
1241 error = -EIO;
1242 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1243 if (!bh)
1244 goto fail;
1245 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1246 brelse(bh);
1247 goto fail;
1248 }
1249
1250 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1251 y++, slot++) {
1252 struct gfs2_quota_change_host qc;
1253 struct gfs2_quota_data *qd;
1254
1255 gfs2_quota_change_in(&qc, bh->b_data +
1256 sizeof(struct gfs2_meta_header) +
1257 y * sizeof(struct gfs2_quota_change));
1258 if (!qc.qc_change)
1259 continue;
1260
1261 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1262 qc.qc_id, &qd);
1263 if (error) {
1264 brelse(bh);
1265 goto fail;
1266 }
1267
1268 set_bit(QDF_CHANGE, &qd->qd_flags);
1269 qd->qd_change = qc.qc_change;
1270 qd->qd_slot = slot;
1271 qd->qd_slot_count = 1;
1272
1273 spin_lock(&qd_lru_lock);
1274 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1275 list_add(&qd->qd_list, &sdp->sd_quota_list);
1276 atomic_inc(&sdp->sd_quota_count);
1277 spin_unlock(&qd_lru_lock);
1278
1279 found++;
1280 }
1281
1282 brelse(bh);
1283 dblock++;
1284 extlen--;
1285 }
1286
1287 if (found)
1288 fs_info(sdp, "found %u quota changes\n", found);
1289
1290 return 0;
1291
1292 fail:
1293 gfs2_quota_cleanup(sdp);
1294 return error;
1295 }
1296
1297 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1298 {
1299 struct list_head *head = &sdp->sd_quota_list;
1300 struct gfs2_quota_data *qd;
1301 unsigned int x;
1302
1303 spin_lock(&qd_lru_lock);
1304 while (!list_empty(head)) {
1305 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1306
1307 if (atomic_read(&qd->qd_count) > 1 ||
1308 (atomic_read(&qd->qd_count) &&
1309 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1310 list_move(&qd->qd_list, head);
1311 spin_unlock(&qd_lru_lock);
1312 schedule();
1313 spin_lock(&qd_lru_lock);
1314 continue;
1315 }
1316
1317 list_del(&qd->qd_list);
1318 /* Also remove if this qd exists in the reclaim list */
1319 if (!list_empty(&qd->qd_reclaim)) {
1320 list_del_init(&qd->qd_reclaim);
1321 atomic_dec(&qd_lru_count);
1322 }
1323 atomic_dec(&sdp->sd_quota_count);
1324 spin_unlock(&qd_lru_lock);
1325
1326 if (!atomic_read(&qd->qd_count)) {
1327 gfs2_assert_warn(sdp, !qd->qd_change);
1328 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1329 } else
1330 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1331 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1332
1333 gfs2_glock_put(qd->qd_gl);
1334 kmem_cache_free(gfs2_quotad_cachep, qd);
1335
1336 spin_lock(&qd_lru_lock);
1337 }
1338 spin_unlock(&qd_lru_lock);
1339
1340 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1341
1342 if (sdp->sd_quota_bitmap) {
1343 for (x = 0; x < sdp->sd_quota_chunks; x++)
1344 kfree(sdp->sd_quota_bitmap[x]);
1345 kfree(sdp->sd_quota_bitmap);
1346 }
1347 }
1348
1349 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1350 {
1351 if (error == 0 || error == -EROFS)
1352 return;
1353 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1354 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1355 }
1356
1357 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1358 int (*fxn)(struct super_block *sb, int type),
1359 unsigned long t, unsigned long *timeo,
1360 unsigned int *new_timeo)
1361 {
1362 if (t >= *timeo) {
1363 int error = fxn(sdp->sd_vfs, 0);
1364 quotad_error(sdp, msg, error);
1365 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1366 } else {
1367 *timeo -= t;
1368 }
1369 }
1370
1371 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1372 {
1373 struct gfs2_inode *ip;
1374
1375 while(1) {
1376 ip = NULL;
1377 spin_lock(&sdp->sd_trunc_lock);
1378 if (!list_empty(&sdp->sd_trunc_list)) {
1379 ip = list_entry(sdp->sd_trunc_list.next,
1380 struct gfs2_inode, i_trunc_list);
1381 list_del_init(&ip->i_trunc_list);
1382 }
1383 spin_unlock(&sdp->sd_trunc_lock);
1384 if (ip == NULL)
1385 return;
1386 gfs2_glock_finish_truncate(ip);
1387 }
1388 }
1389
1390 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1391 if (!sdp->sd_statfs_force_sync) {
1392 sdp->sd_statfs_force_sync = 1;
1393 wake_up(&sdp->sd_quota_wait);
1394 }
1395 }
1396
1397
1398 /**
1399 * gfs2_quotad - Write cached quota changes into the quota file
1400 * @sdp: Pointer to GFS2 superblock
1401 *
1402 */
1403
1404 int gfs2_quotad(void *data)
1405 {
1406 struct gfs2_sbd *sdp = data;
1407 struct gfs2_tune *tune = &sdp->sd_tune;
1408 unsigned long statfs_timeo = 0;
1409 unsigned long quotad_timeo = 0;
1410 unsigned long t = 0;
1411 DEFINE_WAIT(wait);
1412 int empty;
1413
1414 while (!kthread_should_stop()) {
1415
1416 /* Update the master statfs file */
1417 if (sdp->sd_statfs_force_sync) {
1418 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1419 quotad_error(sdp, "statfs", error);
1420 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1421 }
1422 else
1423 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1424 &statfs_timeo,
1425 &tune->gt_statfs_quantum);
1426
1427 /* Update quota file */
1428 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1429 &quotad_timeo, &tune->gt_quota_quantum);
1430
1431 /* Check for & recover partially truncated inodes */
1432 quotad_check_trunc_list(sdp);
1433
1434 if (freezing(current))
1435 refrigerator();
1436 t = min(quotad_timeo, statfs_timeo);
1437
1438 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1439 spin_lock(&sdp->sd_trunc_lock);
1440 empty = list_empty(&sdp->sd_trunc_list);
1441 spin_unlock(&sdp->sd_trunc_lock);
1442 if (empty && !sdp->sd_statfs_force_sync)
1443 t -= schedule_timeout(t);
1444 else
1445 t = 0;
1446 finish_wait(&sdp->sd_quota_wait, &wait);
1447 }
1448
1449 return 0;
1450 }
1451
1452 static int gfs2_quota_get_xstate(struct super_block *sb,
1453 struct fs_quota_stat *fqs)
1454 {
1455 struct gfs2_sbd *sdp = sb->s_fs_info;
1456
1457 memset(fqs, 0, sizeof(struct fs_quota_stat));
1458 fqs->qs_version = FS_QSTAT_VERSION;
1459
1460 switch (sdp->sd_args.ar_quota) {
1461 case GFS2_QUOTA_ON:
1462 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1463 /*FALLTHRU*/
1464 case GFS2_QUOTA_ACCOUNT:
1465 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1466 break;
1467 case GFS2_QUOTA_OFF:
1468 break;
1469 }
1470
1471 if (sdp->sd_quota_inode) {
1472 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1473 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1474 }
1475 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1476 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1477 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1478 return 0;
1479 }
1480
1481 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1482 struct fs_disk_quota *fdq)
1483 {
1484 struct gfs2_sbd *sdp = sb->s_fs_info;
1485 struct gfs2_quota_lvb *qlvb;
1486 struct gfs2_quota_data *qd;
1487 struct gfs2_holder q_gh;
1488 int error;
1489
1490 memset(fdq, 0, sizeof(struct fs_disk_quota));
1491
1492 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1493 return -ESRCH; /* Crazy XFS error code */
1494
1495 if (type == USRQUOTA)
1496 type = QUOTA_USER;
1497 else if (type == GRPQUOTA)
1498 type = QUOTA_GROUP;
1499 else
1500 return -EINVAL;
1501
1502 error = qd_get(sdp, type, id, &qd);
1503 if (error)
1504 return error;
1505 error = do_glock(qd, FORCE, &q_gh);
1506 if (error)
1507 goto out;
1508
1509 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1510 fdq->d_version = FS_DQUOT_VERSION;
1511 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1512 fdq->d_id = id;
1513 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1514 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1515 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1516
1517 gfs2_glock_dq_uninit(&q_gh);
1518 out:
1519 qd_put(qd);
1520 return error;
1521 }
1522
1523 /* GFS2 only supports a subset of the XFS fields */
1524 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1525
1526 static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id,
1527 struct fs_disk_quota *fdq)
1528 {
1529 struct gfs2_sbd *sdp = sb->s_fs_info;
1530 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1531 struct gfs2_quota_data *qd;
1532 struct gfs2_holder q_gh, i_gh;
1533 unsigned int data_blocks, ind_blocks;
1534 unsigned int blocks = 0;
1535 int alloc_required;
1536 struct gfs2_alloc *al;
1537 loff_t offset;
1538 int error;
1539
1540 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1541 return -ESRCH; /* Crazy XFS error code */
1542
1543 switch(type) {
1544 case USRQUOTA:
1545 type = QUOTA_USER;
1546 if (fdq->d_flags != FS_USER_QUOTA)
1547 return -EINVAL;
1548 break;
1549 case GRPQUOTA:
1550 type = QUOTA_GROUP;
1551 if (fdq->d_flags != FS_GROUP_QUOTA)
1552 return -EINVAL;
1553 break;
1554 default:
1555 return -EINVAL;
1556 }
1557
1558 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1559 return -EINVAL;
1560 if (fdq->d_id != id)
1561 return -EINVAL;
1562
1563 error = qd_get(sdp, type, id, &qd);
1564 if (error)
1565 return error;
1566
1567 mutex_lock(&ip->i_inode.i_mutex);
1568 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1569 if (error)
1570 goto out_put;
1571 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1572 if (error)
1573 goto out_q;
1574
1575 /* Check for existing entry, if none then alloc new blocks */
1576 error = update_qd(sdp, qd);
1577 if (error)
1578 goto out_i;
1579
1580 /* If nothing has changed, this is a no-op */
1581 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1582 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1583 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1584
1585 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1586 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1587 fdq->d_fieldmask ^= FS_DQ_BHARD;
1588
1589 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1590 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1591 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1592
1593 if (fdq->d_fieldmask == 0)
1594 goto out_i;
1595
1596 offset = qd2offset(qd);
1597 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1598 if (gfs2_is_stuffed(ip))
1599 alloc_required = 1;
1600 if (alloc_required) {
1601 al = gfs2_alloc_get(ip);
1602 if (al == NULL)
1603 goto out_i;
1604 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1605 &data_blocks, &ind_blocks);
1606 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1607 error = gfs2_inplace_reserve(ip);
1608 if (error)
1609 goto out_alloc;
1610 blocks += gfs2_rg_blocks(al);
1611 }
1612
1613 /* Some quotas span block boundaries and can update two blocks,
1614 adding an extra block to the transaction to handle such quotas */
1615 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1616 if (error)
1617 goto out_release;
1618
1619 /* Apply changes */
1620 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1621
1622 gfs2_trans_end(sdp);
1623 out_release:
1624 if (alloc_required) {
1625 gfs2_inplace_release(ip);
1626 out_alloc:
1627 gfs2_alloc_put(ip);
1628 }
1629 out_i:
1630 gfs2_glock_dq_uninit(&i_gh);
1631 out_q:
1632 gfs2_glock_dq_uninit(&q_gh);
1633 out_put:
1634 mutex_unlock(&ip->i_inode.i_mutex);
1635 qd_put(qd);
1636 return error;
1637 }
1638
1639 const struct quotactl_ops gfs2_quotactl_ops = {
1640 .quota_sync = gfs2_quota_sync,
1641 .get_xstate = gfs2_quota_get_xstate,
1642 .get_dqblk = gfs2_get_dqblk,
1643 .set_dqblk = gfs2_set_dqblk,
1644 };
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