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sched: Revert nohz_ratelimit() for now
[linux-2.6/libata-dev.git] / fs / gfs2 / quota.c
blobb256d6f24288d6507bef949804e57d3e69c8cce2
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, *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 int alloc_required;
791
792 offset = qd2offset(qda[x]);
793 error = gfs2_write_alloc_required(ip, offset,
794 sizeof(struct gfs2_quota),
795 &alloc_required);
796 if (error)
797 goto out_gunlock;
798 if (alloc_required)
799 nalloc++;
800 }
801
802 al = gfs2_alloc_get(ip);
803 if (!al) {
804 error = -ENOMEM;
805 goto out_gunlock;
806 }
807 /*
808 * 1 blk for unstuffing inode if stuffed. We add this extra
809 * block to the reservation unconditionally. If the inode
810 * doesn't need unstuffing, the block will be released to the
811 * rgrp since it won't be allocated during the transaction
812 */
813 al->al_requested = 1;
814 /* +3 in the end for unstuffing block, inode size update block
815 * and another block in case quota straddles page boundary and
816 * two blocks need to be updated instead of 1 */
817 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
818
819 if (nalloc)
820 al->al_requested += nalloc * (data_blocks + ind_blocks);
821 error = gfs2_inplace_reserve(ip);
822 if (error)
823 goto out_alloc;
824
825 if (nalloc)
826 blocks += al->al_rgd->rd_length + nalloc * ind_blocks + RES_STATFS;
827
828 error = gfs2_trans_begin(sdp, blocks, 0);
829 if (error)
830 goto out_ipres;
831
832 for (x = 0; x < num_qd; x++) {
833 qd = qda[x];
834 offset = qd2offset(qd);
835 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
836 if (error)
837 goto out_end_trans;
838
839 do_qc(qd, -qd->qd_change_sync);
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 unsigned int x;
936 int error = 0;
937
938 gfs2_quota_hold(ip, uid, gid);
939
940 if (capable(CAP_SYS_RESOURCE) ||
941 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
942 return 0;
943
944 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
945 sort_qd, NULL);
946
947 for (x = 0; x < al->al_qd_num; x++) {
948 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
949 if (error)
950 break;
951 }
952
953 if (!error)
954 set_bit(GIF_QD_LOCKED, &ip->i_flags);
955 else {
956 while (x--)
957 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
958 gfs2_quota_unhold(ip);
959 }
960
961 return error;
962 }
963
964 static int need_sync(struct gfs2_quota_data *qd)
965 {
966 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
967 struct gfs2_tune *gt = &sdp->sd_tune;
968 s64 value;
969 unsigned int num, den;
970 int do_sync = 1;
971
972 if (!qd->qd_qb.qb_limit)
973 return 0;
974
975 spin_lock(&qd_lru_lock);
976 value = qd->qd_change;
977 spin_unlock(&qd_lru_lock);
978
979 spin_lock(&gt->gt_spin);
980 num = gt->gt_quota_scale_num;
981 den = gt->gt_quota_scale_den;
982 spin_unlock(&gt->gt_spin);
983
984 if (value < 0)
985 do_sync = 0;
986 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
987 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
988 do_sync = 0;
989 else {
990 value *= gfs2_jindex_size(sdp) * num;
991 value = div_s64(value, den);
992 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
993 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
994 do_sync = 0;
995 }
996
997 return do_sync;
998 }
999
1000 void gfs2_quota_unlock(struct gfs2_inode *ip)
1001 {
1002 struct gfs2_alloc *al = ip->i_alloc;
1003 struct gfs2_quota_data *qda[4];
1004 unsigned int count = 0;
1005 unsigned int x;
1006
1007 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1008 goto out;
1009
1010 for (x = 0; x < al->al_qd_num; x++) {
1011 struct gfs2_quota_data *qd;
1012 int sync;
1013
1014 qd = al->al_qd[x];
1015 sync = need_sync(qd);
1016
1017 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
1018
1019 if (sync && qd_trylock(qd))
1020 qda[count++] = qd;
1021 }
1022
1023 if (count) {
1024 do_sync(count, qda);
1025 for (x = 0; x < count; x++)
1026 qd_unlock(qda[x]);
1027 }
1028
1029 out:
1030 gfs2_quota_unhold(ip);
1031 }
1032
1033 #define MAX_LINE 256
1034
1035 static int print_message(struct gfs2_quota_data *qd, char *type)
1036 {
1037 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1038
1039 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1040 sdp->sd_fsname, type,
1041 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1042 qd->qd_id);
1043
1044 return 0;
1045 }
1046
1047 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1048 {
1049 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1050 struct gfs2_alloc *al = ip->i_alloc;
1051 struct gfs2_quota_data *qd;
1052 s64 value;
1053 unsigned int x;
1054 int error = 0;
1055
1056 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1057 return 0;
1058
1059 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1060 return 0;
1061
1062 for (x = 0; x < al->al_qd_num; x++) {
1063 qd = al->al_qd[x];
1064
1065 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1066 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1067 continue;
1068
1069 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1070 spin_lock(&qd_lru_lock);
1071 value += qd->qd_change;
1072 spin_unlock(&qd_lru_lock);
1073
1074 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1075 print_message(qd, "exceeded");
1076 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1077 USRQUOTA : GRPQUOTA, qd->qd_id,
1078 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1079
1080 error = -EDQUOT;
1081 break;
1082 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1083 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1084 time_after_eq(jiffies, qd->qd_last_warn +
1085 gfs2_tune_get(sdp,
1086 gt_quota_warn_period) * HZ)) {
1087 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1088 USRQUOTA : GRPQUOTA, qd->qd_id,
1089 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1090 error = print_message(qd, "warning");
1091 qd->qd_last_warn = jiffies;
1092 }
1093 }
1094
1095 return error;
1096 }
1097
1098 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1099 u32 uid, u32 gid)
1100 {
1101 struct gfs2_alloc *al = ip->i_alloc;
1102 struct gfs2_quota_data *qd;
1103 unsigned int x;
1104
1105 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1106 return;
1107 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1108 return;
1109
1110 for (x = 0; x < al->al_qd_num; x++) {
1111 qd = al->al_qd[x];
1112
1113 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1114 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1115 do_qc(qd, change);
1116 }
1117 }
1118 }
1119
1120 int gfs2_quota_sync(struct super_block *sb, int type, int wait)
1121 {
1122 struct gfs2_sbd *sdp = sb->s_fs_info;
1123 struct gfs2_quota_data **qda;
1124 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1125 unsigned int num_qd;
1126 unsigned int x;
1127 int error = 0;
1128
1129 sdp->sd_quota_sync_gen++;
1130
1131 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1132 if (!qda)
1133 return -ENOMEM;
1134
1135 do {
1136 num_qd = 0;
1137
1138 for (;;) {
1139 error = qd_fish(sdp, qda + num_qd);
1140 if (error || !qda[num_qd])
1141 break;
1142 if (++num_qd == max_qd)
1143 break;
1144 }
1145
1146 if (num_qd) {
1147 if (!error)
1148 error = do_sync(num_qd, qda);
1149 if (!error)
1150 for (x = 0; x < num_qd; x++)
1151 qda[x]->qd_sync_gen =
1152 sdp->sd_quota_sync_gen;
1153
1154 for (x = 0; x < num_qd; x++)
1155 qd_unlock(qda[x]);
1156 }
1157 } while (!error && num_qd == max_qd);
1158
1159 kfree(qda);
1160
1161 return error;
1162 }
1163
1164 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1165 {
1166 return gfs2_quota_sync(sb, type, 0);
1167 }
1168
1169 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1170 {
1171 struct gfs2_quota_data *qd;
1172 struct gfs2_holder q_gh;
1173 int error;
1174
1175 error = qd_get(sdp, user, id, &qd);
1176 if (error)
1177 return error;
1178
1179 error = do_glock(qd, FORCE, &q_gh);
1180 if (!error)
1181 gfs2_glock_dq_uninit(&q_gh);
1182
1183 qd_put(qd);
1184 return error;
1185 }
1186
1187 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1188 {
1189 const struct gfs2_quota_change *str = buf;
1190
1191 qc->qc_change = be64_to_cpu(str->qc_change);
1192 qc->qc_flags = be32_to_cpu(str->qc_flags);
1193 qc->qc_id = be32_to_cpu(str->qc_id);
1194 }
1195
1196 int gfs2_quota_init(struct gfs2_sbd *sdp)
1197 {
1198 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1199 unsigned int blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
1200 unsigned int x, slot = 0;
1201 unsigned int found = 0;
1202 u64 dblock;
1203 u32 extlen = 0;
1204 int error;
1205
1206 if (!ip->i_disksize || ip->i_disksize > (64 << 20) ||
1207 ip->i_disksize & (sdp->sd_sb.sb_bsize - 1)) {
1208 gfs2_consist_inode(ip);
1209 return -EIO;
1210 }
1211 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1212 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1213
1214 error = -ENOMEM;
1215
1216 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1217 sizeof(unsigned char *), GFP_NOFS);
1218 if (!sdp->sd_quota_bitmap)
1219 return error;
1220
1221 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1222 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1223 if (!sdp->sd_quota_bitmap[x])
1224 goto fail;
1225 }
1226
1227 for (x = 0; x < blocks; x++) {
1228 struct buffer_head *bh;
1229 unsigned int y;
1230
1231 if (!extlen) {
1232 int new = 0;
1233 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1234 if (error)
1235 goto fail;
1236 }
1237 error = -EIO;
1238 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1239 if (!bh)
1240 goto fail;
1241 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1242 brelse(bh);
1243 goto fail;
1244 }
1245
1246 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1247 y++, slot++) {
1248 struct gfs2_quota_change_host qc;
1249 struct gfs2_quota_data *qd;
1250
1251 gfs2_quota_change_in(&qc, bh->b_data +
1252 sizeof(struct gfs2_meta_header) +
1253 y * sizeof(struct gfs2_quota_change));
1254 if (!qc.qc_change)
1255 continue;
1256
1257 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1258 qc.qc_id, &qd);
1259 if (error) {
1260 brelse(bh);
1261 goto fail;
1262 }
1263
1264 set_bit(QDF_CHANGE, &qd->qd_flags);
1265 qd->qd_change = qc.qc_change;
1266 qd->qd_slot = slot;
1267 qd->qd_slot_count = 1;
1268
1269 spin_lock(&qd_lru_lock);
1270 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1271 list_add(&qd->qd_list, &sdp->sd_quota_list);
1272 atomic_inc(&sdp->sd_quota_count);
1273 spin_unlock(&qd_lru_lock);
1274
1275 found++;
1276 }
1277
1278 brelse(bh);
1279 dblock++;
1280 extlen--;
1281 }
1282
1283 if (found)
1284 fs_info(sdp, "found %u quota changes\n", found);
1285
1286 return 0;
1287
1288 fail:
1289 gfs2_quota_cleanup(sdp);
1290 return error;
1291 }
1292
1293 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1294 {
1295 struct list_head *head = &sdp->sd_quota_list;
1296 struct gfs2_quota_data *qd;
1297 unsigned int x;
1298
1299 spin_lock(&qd_lru_lock);
1300 while (!list_empty(head)) {
1301 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1302
1303 if (atomic_read(&qd->qd_count) > 1 ||
1304 (atomic_read(&qd->qd_count) &&
1305 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1306 list_move(&qd->qd_list, head);
1307 spin_unlock(&qd_lru_lock);
1308 schedule();
1309 spin_lock(&qd_lru_lock);
1310 continue;
1311 }
1312
1313 list_del(&qd->qd_list);
1314 /* Also remove if this qd exists in the reclaim list */
1315 if (!list_empty(&qd->qd_reclaim)) {
1316 list_del_init(&qd->qd_reclaim);
1317 atomic_dec(&qd_lru_count);
1318 }
1319 atomic_dec(&sdp->sd_quota_count);
1320 spin_unlock(&qd_lru_lock);
1321
1322 if (!atomic_read(&qd->qd_count)) {
1323 gfs2_assert_warn(sdp, !qd->qd_change);
1324 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1325 } else
1326 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1327 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1328
1329 gfs2_glock_put(qd->qd_gl);
1330 kmem_cache_free(gfs2_quotad_cachep, qd);
1331
1332 spin_lock(&qd_lru_lock);
1333 }
1334 spin_unlock(&qd_lru_lock);
1335
1336 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1337
1338 if (sdp->sd_quota_bitmap) {
1339 for (x = 0; x < sdp->sd_quota_chunks; x++)
1340 kfree(sdp->sd_quota_bitmap[x]);
1341 kfree(sdp->sd_quota_bitmap);
1342 }
1343 }
1344
1345 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1346 {
1347 if (error == 0 || error == -EROFS)
1348 return;
1349 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1350 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1351 }
1352
1353 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1354 int (*fxn)(struct super_block *sb, int type),
1355 unsigned long t, unsigned long *timeo,
1356 unsigned int *new_timeo)
1357 {
1358 if (t >= *timeo) {
1359 int error = fxn(sdp->sd_vfs, 0);
1360 quotad_error(sdp, msg, error);
1361 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1362 } else {
1363 *timeo -= t;
1364 }
1365 }
1366
1367 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1368 {
1369 struct gfs2_inode *ip;
1370
1371 while(1) {
1372 ip = NULL;
1373 spin_lock(&sdp->sd_trunc_lock);
1374 if (!list_empty(&sdp->sd_trunc_list)) {
1375 ip = list_entry(sdp->sd_trunc_list.next,
1376 struct gfs2_inode, i_trunc_list);
1377 list_del_init(&ip->i_trunc_list);
1378 }
1379 spin_unlock(&sdp->sd_trunc_lock);
1380 if (ip == NULL)
1381 return;
1382 gfs2_glock_finish_truncate(ip);
1383 }
1384 }
1385
1386 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1387 if (!sdp->sd_statfs_force_sync) {
1388 sdp->sd_statfs_force_sync = 1;
1389 wake_up(&sdp->sd_quota_wait);
1390 }
1391 }
1392
1393
1394 /**
1395 * gfs2_quotad - Write cached quota changes into the quota file
1396 * @sdp: Pointer to GFS2 superblock
1397 *
1398 */
1399
1400 int gfs2_quotad(void *data)
1401 {
1402 struct gfs2_sbd *sdp = data;
1403 struct gfs2_tune *tune = &sdp->sd_tune;
1404 unsigned long statfs_timeo = 0;
1405 unsigned long quotad_timeo = 0;
1406 unsigned long t = 0;
1407 DEFINE_WAIT(wait);
1408 int empty;
1409
1410 while (!kthread_should_stop()) {
1411
1412 /* Update the master statfs file */
1413 if (sdp->sd_statfs_force_sync) {
1414 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1415 quotad_error(sdp, "statfs", error);
1416 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1417 }
1418 else
1419 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1420 &statfs_timeo,
1421 &tune->gt_statfs_quantum);
1422
1423 /* Update quota file */
1424 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1425 &quotad_timeo, &tune->gt_quota_quantum);
1426
1427 /* Check for & recover partially truncated inodes */
1428 quotad_check_trunc_list(sdp);
1429
1430 if (freezing(current))
1431 refrigerator();
1432 t = min(quotad_timeo, statfs_timeo);
1433
1434 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1435 spin_lock(&sdp->sd_trunc_lock);
1436 empty = list_empty(&sdp->sd_trunc_list);
1437 spin_unlock(&sdp->sd_trunc_lock);
1438 if (empty && !sdp->sd_statfs_force_sync)
1439 t -= schedule_timeout(t);
1440 else
1441 t = 0;
1442 finish_wait(&sdp->sd_quota_wait, &wait);
1443 }
1444
1445 return 0;
1446 }
1447
1448 static int gfs2_quota_get_xstate(struct super_block *sb,
1449 struct fs_quota_stat *fqs)
1450 {
1451 struct gfs2_sbd *sdp = sb->s_fs_info;
1452
1453 memset(fqs, 0, sizeof(struct fs_quota_stat));
1454 fqs->qs_version = FS_QSTAT_VERSION;
1455
1456 switch (sdp->sd_args.ar_quota) {
1457 case GFS2_QUOTA_ON:
1458 fqs->qs_flags |= (XFS_QUOTA_UDQ_ENFD | XFS_QUOTA_GDQ_ENFD);
1459 /*FALLTHRU*/
1460 case GFS2_QUOTA_ACCOUNT:
1461 fqs->qs_flags |= (XFS_QUOTA_UDQ_ACCT | XFS_QUOTA_GDQ_ACCT);
1462 break;
1463 case GFS2_QUOTA_OFF:
1464 break;
1465 }
1466
1467 if (sdp->sd_quota_inode) {
1468 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1469 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1470 }
1471 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1472 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1473 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1474 return 0;
1475 }
1476
1477 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1478 struct fs_disk_quota *fdq)
1479 {
1480 struct gfs2_sbd *sdp = sb->s_fs_info;
1481 struct gfs2_quota_lvb *qlvb;
1482 struct gfs2_quota_data *qd;
1483 struct gfs2_holder q_gh;
1484 int error;
1485
1486 memset(fdq, 0, sizeof(struct fs_disk_quota));
1487
1488 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1489 return -ESRCH; /* Crazy XFS error code */
1490
1491 if (type == USRQUOTA)
1492 type = QUOTA_USER;
1493 else if (type == GRPQUOTA)
1494 type = QUOTA_GROUP;
1495 else
1496 return -EINVAL;
1497
1498 error = qd_get(sdp, type, id, &qd);
1499 if (error)
1500 return error;
1501 error = do_glock(qd, FORCE, &q_gh);
1502 if (error)
1503 goto out;
1504
1505 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1506 fdq->d_version = FS_DQUOT_VERSION;
1507 fdq->d_flags = (type == QUOTA_USER) ? XFS_USER_QUOTA : XFS_GROUP_QUOTA;
1508 fdq->d_id = id;
1509 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit);
1510 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn);
1511 fdq->d_bcount = be64_to_cpu(qlvb->qb_value);
1512
1513 gfs2_glock_dq_uninit(&q_gh);
1514 out:
1515 qd_put(qd);
1516 return error;
1517 }
1518
1519 /* GFS2 only supports a subset of the XFS fields */
1520 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD)
1521
1522 static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id,
1523 struct fs_disk_quota *fdq)
1524 {
1525 struct gfs2_sbd *sdp = sb->s_fs_info;
1526 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1527 struct gfs2_quota_data *qd;
1528 struct gfs2_holder q_gh, i_gh;
1529 unsigned int data_blocks, ind_blocks;
1530 unsigned int blocks = 0;
1531 int alloc_required;
1532 struct gfs2_alloc *al;
1533 loff_t offset;
1534 int error;
1535
1536 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1537 return -ESRCH; /* Crazy XFS error code */
1538
1539 switch(type) {
1540 case USRQUOTA:
1541 type = QUOTA_USER;
1542 if (fdq->d_flags != XFS_USER_QUOTA)
1543 return -EINVAL;
1544 break;
1545 case GRPQUOTA:
1546 type = QUOTA_GROUP;
1547 if (fdq->d_flags != XFS_GROUP_QUOTA)
1548 return -EINVAL;
1549 break;
1550 default:
1551 return -EINVAL;
1552 }
1553
1554 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1555 return -EINVAL;
1556 if (fdq->d_id != id)
1557 return -EINVAL;
1558
1559 error = qd_get(sdp, type, id, &qd);
1560 if (error)
1561 return error;
1562
1563 mutex_lock(&ip->i_inode.i_mutex);
1564 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1565 if (error)
1566 goto out_put;
1567 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1568 if (error)
1569 goto out_q;
1570
1571 /* Check for existing entry, if none then alloc new blocks */
1572 error = update_qd(sdp, qd);
1573 if (error)
1574 goto out_i;
1575
1576 /* If nothing has changed, this is a no-op */
1577 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1578 (fdq->d_blk_softlimit == be64_to_cpu(qd->qd_qb.qb_warn)))
1579 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1580 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1581 (fdq->d_blk_hardlimit == be64_to_cpu(qd->qd_qb.qb_limit)))
1582 fdq->d_fieldmask ^= FS_DQ_BHARD;
1583 if (fdq->d_fieldmask == 0)
1584 goto out_i;
1585
1586 offset = qd2offset(qd);
1587 error = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota),
1588 &alloc_required);
1589 if (error)
1590 goto out_i;
1591 if (alloc_required) {
1592 al = gfs2_alloc_get(ip);
1593 if (al == NULL)
1594 goto out_i;
1595 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1596 &data_blocks, &ind_blocks);
1597 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1598 error = gfs2_inplace_reserve(ip);
1599 if (error)
1600 goto out_alloc;
1601 }
1602
1603 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0);
1604 if (error)
1605 goto out_release;
1606
1607 /* Apply changes */
1608 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1609
1610 gfs2_trans_end(sdp);
1611 out_release:
1612 if (alloc_required) {
1613 gfs2_inplace_release(ip);
1614 out_alloc:
1615 gfs2_alloc_put(ip);
1616 }
1617 out_i:
1618 gfs2_glock_dq_uninit(&i_gh);
1619 out_q:
1620 gfs2_glock_dq_uninit(&q_gh);
1621 out_put:
1622 mutex_unlock(&ip->i_inode.i_mutex);
1623 qd_put(qd);
1624 return error;
1625 }
1626
1627 const struct quotactl_ops gfs2_quotactl_ops = {
1628 .quota_sync = gfs2_quota_sync,
1629 .get_xstate = gfs2_quota_get_xstate,
1630 .get_dqblk = gfs2_get_dqblk,
1631 .set_dqblk = gfs2_set_dqblk,
1632 };
1633
Linux 2.6 libata-dev (mirror)