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Linux 3.12.5
[linux/fpc-iii.git] / fs / gfs2 / quota.c
blobdb441359ee8cd2f31fa4a980afe8c54a3f715447
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 struct gfs2_quota_change_host {
69 u64 qc_change;
70 u32 qc_flags; /* GFS2_QCF_... */
71 struct kqid qc_id;
72 };
73
74 static LIST_HEAD(qd_lru_list);
75 static atomic_t qd_lru_count = ATOMIC_INIT(0);
76 static DEFINE_SPINLOCK(qd_lru_lock);
77
78 unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
79 struct shrink_control *sc)
80 {
81 struct gfs2_quota_data *qd;
82 struct gfs2_sbd *sdp;
83 int nr_to_scan = sc->nr_to_scan;
84 long freed = 0;
85
86 if (!(sc->gfp_mask & __GFP_FS))
87 return SHRINK_STOP;
88
89 spin_lock(&qd_lru_lock);
90 while (nr_to_scan && !list_empty(&qd_lru_list)) {
91 qd = list_entry(qd_lru_list.next,
92 struct gfs2_quota_data, qd_reclaim);
93 sdp = qd->qd_gl->gl_sbd;
94
95 /* Free from the filesystem-specific list */
96 list_del(&qd->qd_list);
97
98 gfs2_assert_warn(sdp, !qd->qd_change);
99 gfs2_assert_warn(sdp, !qd->qd_slot_count);
100 gfs2_assert_warn(sdp, !qd->qd_bh_count);
101
102 gfs2_glock_put(qd->qd_gl);
103 atomic_dec(&sdp->sd_quota_count);
104
105 /* Delete it from the common reclaim list */
106 list_del_init(&qd->qd_reclaim);
107 atomic_dec(&qd_lru_count);
108 spin_unlock(&qd_lru_lock);
109 kmem_cache_free(gfs2_quotad_cachep, qd);
110 spin_lock(&qd_lru_lock);
111 nr_to_scan--;
112 freed++;
113 }
114 spin_unlock(&qd_lru_lock);
115 return freed;
116 }
117
118 unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
119 struct shrink_control *sc)
120 {
121 return vfs_pressure_ratio(atomic_read(&qd_lru_count));
122 }
123
124 static u64 qd2index(struct gfs2_quota_data *qd)
125 {
126 struct kqid qid = qd->qd_id;
127 return (2 * (u64)from_kqid(&init_user_ns, qid)) +
128 ((qid.type == USRQUOTA) ? 0 : 1);
129 }
130
131 static u64 qd2offset(struct gfs2_quota_data *qd)
132 {
133 u64 offset;
134
135 offset = qd2index(qd);
136 offset *= sizeof(struct gfs2_quota);
137
138 return offset;
139 }
140
141 static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid,
142 struct gfs2_quota_data **qdp)
143 {
144 struct gfs2_quota_data *qd;
145 int error;
146
147 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
148 if (!qd)
149 return -ENOMEM;
150
151 atomic_set(&qd->qd_count, 1);
152 qd->qd_id = qid;
153 qd->qd_slot = -1;
154 INIT_LIST_HEAD(&qd->qd_reclaim);
155
156 error = gfs2_glock_get(sdp, qd2index(qd),
157 &gfs2_quota_glops, CREATE, &qd->qd_gl);
158 if (error)
159 goto fail;
160
161 *qdp = qd;
162
163 return 0;
164
165 fail:
166 kmem_cache_free(gfs2_quotad_cachep, qd);
167 return error;
168 }
169
170 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
171 struct gfs2_quota_data **qdp)
172 {
173 struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
174 int error, found;
175
176 *qdp = NULL;
177
178 for (;;) {
179 found = 0;
180 spin_lock(&qd_lru_lock);
181 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
182 if (qid_eq(qd->qd_id, qid)) {
183 if (!atomic_read(&qd->qd_count) &&
184 !list_empty(&qd->qd_reclaim)) {
185 /* Remove it from reclaim list */
186 list_del_init(&qd->qd_reclaim);
187 atomic_dec(&qd_lru_count);
188 }
189 atomic_inc(&qd->qd_count);
190 found = 1;
191 break;
192 }
193 }
194
195 if (!found)
196 qd = NULL;
197
198 if (!qd && new_qd) {
199 qd = new_qd;
200 list_add(&qd->qd_list, &sdp->sd_quota_list);
201 atomic_inc(&sdp->sd_quota_count);
202 new_qd = NULL;
203 }
204
205 spin_unlock(&qd_lru_lock);
206
207 if (qd) {
208 if (new_qd) {
209 gfs2_glock_put(new_qd->qd_gl);
210 kmem_cache_free(gfs2_quotad_cachep, new_qd);
211 }
212 *qdp = qd;
213 return 0;
214 }
215
216 error = qd_alloc(sdp, qid, &new_qd);
217 if (error)
218 return error;
219 }
220 }
221
222 static void qd_hold(struct gfs2_quota_data *qd)
223 {
224 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
225 gfs2_assert(sdp, atomic_read(&qd->qd_count));
226 atomic_inc(&qd->qd_count);
227 }
228
229 static void qd_put(struct gfs2_quota_data *qd)
230 {
231 if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
232 /* Add to the reclaim list */
233 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
234 atomic_inc(&qd_lru_count);
235 spin_unlock(&qd_lru_lock);
236 }
237 }
238
239 static int slot_get(struct gfs2_quota_data *qd)
240 {
241 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
242 unsigned int c, o = 0, b;
243 unsigned char byte = 0;
244
245 spin_lock(&qd_lru_lock);
246
247 if (qd->qd_slot_count++) {
248 spin_unlock(&qd_lru_lock);
249 return 0;
250 }
251
252 for (c = 0; c < sdp->sd_quota_chunks; c++)
253 for (o = 0; o < PAGE_SIZE; o++) {
254 byte = sdp->sd_quota_bitmap[c][o];
255 if (byte != 0xFF)
256 goto found;
257 }
258
259 goto fail;
260
261 found:
262 for (b = 0; b < 8; b++)
263 if (!(byte & (1 << b)))
264 break;
265 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
266
267 if (qd->qd_slot >= sdp->sd_quota_slots)
268 goto fail;
269
270 sdp->sd_quota_bitmap[c][o] |= 1 << b;
271
272 spin_unlock(&qd_lru_lock);
273
274 return 0;
275
276 fail:
277 qd->qd_slot_count--;
278 spin_unlock(&qd_lru_lock);
279 return -ENOSPC;
280 }
281
282 static void slot_hold(struct gfs2_quota_data *qd)
283 {
284 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
285
286 spin_lock(&qd_lru_lock);
287 gfs2_assert(sdp, qd->qd_slot_count);
288 qd->qd_slot_count++;
289 spin_unlock(&qd_lru_lock);
290 }
291
292 static void slot_put(struct gfs2_quota_data *qd)
293 {
294 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
295
296 spin_lock(&qd_lru_lock);
297 gfs2_assert(sdp, qd->qd_slot_count);
298 if (!--qd->qd_slot_count) {
299 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
300 qd->qd_slot = -1;
301 }
302 spin_unlock(&qd_lru_lock);
303 }
304
305 static int bh_get(struct gfs2_quota_data *qd)
306 {
307 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
308 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
309 unsigned int block, offset;
310 struct buffer_head *bh;
311 int error;
312 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
313
314 mutex_lock(&sdp->sd_quota_mutex);
315
316 if (qd->qd_bh_count++) {
317 mutex_unlock(&sdp->sd_quota_mutex);
318 return 0;
319 }
320
321 block = qd->qd_slot / sdp->sd_qc_per_block;
322 offset = qd->qd_slot % sdp->sd_qc_per_block;
323
324 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
325 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
326 if (error)
327 goto fail;
328 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
329 if (error)
330 goto fail;
331 error = -EIO;
332 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
333 goto fail_brelse;
334
335 qd->qd_bh = bh;
336 qd->qd_bh_qc = (struct gfs2_quota_change *)
337 (bh->b_data + sizeof(struct gfs2_meta_header) +
338 offset * sizeof(struct gfs2_quota_change));
339
340 mutex_unlock(&sdp->sd_quota_mutex);
341
342 return 0;
343
344 fail_brelse:
345 brelse(bh);
346 fail:
347 qd->qd_bh_count--;
348 mutex_unlock(&sdp->sd_quota_mutex);
349 return error;
350 }
351
352 static void bh_put(struct gfs2_quota_data *qd)
353 {
354 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
355
356 mutex_lock(&sdp->sd_quota_mutex);
357 gfs2_assert(sdp, qd->qd_bh_count);
358 if (!--qd->qd_bh_count) {
359 brelse(qd->qd_bh);
360 qd->qd_bh = NULL;
361 qd->qd_bh_qc = NULL;
362 }
363 mutex_unlock(&sdp->sd_quota_mutex);
364 }
365
366 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
367 {
368 struct gfs2_quota_data *qd = NULL;
369 int error;
370 int found = 0;
371
372 *qdp = NULL;
373
374 if (sdp->sd_vfs->s_flags & MS_RDONLY)
375 return 0;
376
377 spin_lock(&qd_lru_lock);
378
379 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
380 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
381 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
382 qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
383 continue;
384
385 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
386
387 set_bit(QDF_LOCKED, &qd->qd_flags);
388 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
389 atomic_inc(&qd->qd_count);
390 qd->qd_change_sync = qd->qd_change;
391 gfs2_assert_warn(sdp, qd->qd_slot_count);
392 qd->qd_slot_count++;
393 found = 1;
394
395 break;
396 }
397
398 if (!found)
399 qd = NULL;
400
401 spin_unlock(&qd_lru_lock);
402
403 if (qd) {
404 gfs2_assert_warn(sdp, qd->qd_change_sync);
405 error = bh_get(qd);
406 if (error) {
407 clear_bit(QDF_LOCKED, &qd->qd_flags);
408 slot_put(qd);
409 qd_put(qd);
410 return error;
411 }
412 }
413
414 *qdp = qd;
415
416 return 0;
417 }
418
419 static int qd_trylock(struct gfs2_quota_data *qd)
420 {
421 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
422
423 if (sdp->sd_vfs->s_flags & MS_RDONLY)
424 return 0;
425
426 spin_lock(&qd_lru_lock);
427
428 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
429 !test_bit(QDF_CHANGE, &qd->qd_flags)) {
430 spin_unlock(&qd_lru_lock);
431 return 0;
432 }
433
434 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
435
436 set_bit(QDF_LOCKED, &qd->qd_flags);
437 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
438 atomic_inc(&qd->qd_count);
439 qd->qd_change_sync = qd->qd_change;
440 gfs2_assert_warn(sdp, qd->qd_slot_count);
441 qd->qd_slot_count++;
442
443 spin_unlock(&qd_lru_lock);
444
445 gfs2_assert_warn(sdp, qd->qd_change_sync);
446 if (bh_get(qd)) {
447 clear_bit(QDF_LOCKED, &qd->qd_flags);
448 slot_put(qd);
449 qd_put(qd);
450 return 0;
451 }
452
453 return 1;
454 }
455
456 static void qd_unlock(struct gfs2_quota_data *qd)
457 {
458 gfs2_assert_warn(qd->qd_gl->gl_sbd,
459 test_bit(QDF_LOCKED, &qd->qd_flags));
460 clear_bit(QDF_LOCKED, &qd->qd_flags);
461 bh_put(qd);
462 slot_put(qd);
463 qd_put(qd);
464 }
465
466 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
467 struct gfs2_quota_data **qdp)
468 {
469 int error;
470
471 error = qd_get(sdp, qid, qdp);
472 if (error)
473 return error;
474
475 error = slot_get(*qdp);
476 if (error)
477 goto fail;
478
479 error = bh_get(*qdp);
480 if (error)
481 goto fail_slot;
482
483 return 0;
484
485 fail_slot:
486 slot_put(*qdp);
487 fail:
488 qd_put(*qdp);
489 return error;
490 }
491
492 static void qdsb_put(struct gfs2_quota_data *qd)
493 {
494 bh_put(qd);
495 slot_put(qd);
496 qd_put(qd);
497 }
498
499 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
500 {
501 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
502 struct gfs2_quota_data **qd;
503 int error;
504
505 if (ip->i_res == NULL) {
506 error = gfs2_rs_alloc(ip);
507 if (error)
508 return error;
509 }
510
511 qd = ip->i_res->rs_qa_qd;
512
513 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
514 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
515 return -EIO;
516
517 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
518 return 0;
519
520 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
521 if (error)
522 goto out;
523 ip->i_res->rs_qa_qd_num++;
524 qd++;
525
526 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
527 if (error)
528 goto out;
529 ip->i_res->rs_qa_qd_num++;
530 qd++;
531
532 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
533 !uid_eq(uid, ip->i_inode.i_uid)) {
534 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
535 if (error)
536 goto out;
537 ip->i_res->rs_qa_qd_num++;
538 qd++;
539 }
540
541 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
542 !gid_eq(gid, ip->i_inode.i_gid)) {
543 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
544 if (error)
545 goto out;
546 ip->i_res->rs_qa_qd_num++;
547 qd++;
548 }
549
550 out:
551 if (error)
552 gfs2_quota_unhold(ip);
553 return error;
554 }
555
556 void gfs2_quota_unhold(struct gfs2_inode *ip)
557 {
558 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
559 unsigned int x;
560
561 if (ip->i_res == NULL)
562 return;
563 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
564
565 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
566 qdsb_put(ip->i_res->rs_qa_qd[x]);
567 ip->i_res->rs_qa_qd[x] = NULL;
568 }
569 ip->i_res->rs_qa_qd_num = 0;
570 }
571
572 static int sort_qd(const void *a, const void *b)
573 {
574 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
575 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
576
577 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
578 return -1;
579 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
580 return 1;
581 return 0;
582 }
583
584 static void do_qc(struct gfs2_quota_data *qd, s64 change)
585 {
586 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
587 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
588 struct gfs2_quota_change *qc = qd->qd_bh_qc;
589 s64 x;
590
591 mutex_lock(&sdp->sd_quota_mutex);
592 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
593
594 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
595 qc->qc_change = 0;
596 qc->qc_flags = 0;
597 if (qd->qd_id.type == USRQUOTA)
598 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
599 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
600 }
601
602 x = be64_to_cpu(qc->qc_change) + change;
603 qc->qc_change = cpu_to_be64(x);
604
605 spin_lock(&qd_lru_lock);
606 qd->qd_change = x;
607 spin_unlock(&qd_lru_lock);
608
609 if (!x) {
610 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
611 clear_bit(QDF_CHANGE, &qd->qd_flags);
612 qc->qc_flags = 0;
613 qc->qc_id = 0;
614 slot_put(qd);
615 qd_put(qd);
616 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
617 qd_hold(qd);
618 slot_hold(qd);
619 }
620
621 mutex_unlock(&sdp->sd_quota_mutex);
622 }
623
624 /**
625 * gfs2_adjust_quota - adjust record of current block usage
626 * @ip: The quota inode
627 * @loc: Offset of the entry in the quota file
628 * @change: The amount of usage change to record
629 * @qd: The quota data
630 * @fdq: The updated limits to record
631 *
632 * This function was mostly borrowed from gfs2_block_truncate_page which was
633 * in turn mostly borrowed from ext3
634 *
635 * Returns: 0 or -ve on error
636 */
637
638 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
639 s64 change, struct gfs2_quota_data *qd,
640 struct fs_disk_quota *fdq)
641 {
642 struct inode *inode = &ip->i_inode;
643 struct gfs2_sbd *sdp = GFS2_SB(inode);
644 struct address_space *mapping = inode->i_mapping;
645 unsigned long index = loc >> PAGE_CACHE_SHIFT;
646 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
647 unsigned blocksize, iblock, pos;
648 struct buffer_head *bh;
649 struct page *page;
650 void *kaddr, *ptr;
651 struct gfs2_quota q, *qp;
652 int err, nbytes;
653 u64 size;
654
655 if (gfs2_is_stuffed(ip)) {
656 err = gfs2_unstuff_dinode(ip, NULL);
657 if (err)
658 return err;
659 }
660
661 memset(&q, 0, sizeof(struct gfs2_quota));
662 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
663 if (err < 0)
664 return err;
665
666 err = -EIO;
667 qp = &q;
668 qp->qu_value = be64_to_cpu(qp->qu_value);
669 qp->qu_value += change;
670 qp->qu_value = cpu_to_be64(qp->qu_value);
671 qd->qd_qb.qb_value = qp->qu_value;
672 if (fdq) {
673 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
674 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
675 qd->qd_qb.qb_warn = qp->qu_warn;
676 }
677 if (fdq->d_fieldmask & FS_DQ_BHARD) {
678 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
679 qd->qd_qb.qb_limit = qp->qu_limit;
680 }
681 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
682 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
683 qd->qd_qb.qb_value = qp->qu_value;
684 }
685 }
686
687 /* Write the quota into the quota file on disk */
688 ptr = qp;
689 nbytes = sizeof(struct gfs2_quota);
690 get_a_page:
691 page = find_or_create_page(mapping, index, GFP_NOFS);
692 if (!page)
693 return -ENOMEM;
694
695 blocksize = inode->i_sb->s_blocksize;
696 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
697
698 if (!page_has_buffers(page))
699 create_empty_buffers(page, blocksize, 0);
700
701 bh = page_buffers(page);
702 pos = blocksize;
703 while (offset >= pos) {
704 bh = bh->b_this_page;
705 iblock++;
706 pos += blocksize;
707 }
708
709 if (!buffer_mapped(bh)) {
710 gfs2_block_map(inode, iblock, bh, 1);
711 if (!buffer_mapped(bh))
712 goto unlock_out;
713 /* If it's a newly allocated disk block for quota, zero it */
714 if (buffer_new(bh))
715 zero_user(page, pos - blocksize, bh->b_size);
716 }
717
718 if (PageUptodate(page))
719 set_buffer_uptodate(bh);
720
721 if (!buffer_uptodate(bh)) {
722 ll_rw_block(READ | REQ_META, 1, &bh);
723 wait_on_buffer(bh);
724 if (!buffer_uptodate(bh))
725 goto unlock_out;
726 }
727
728 gfs2_trans_add_data(ip->i_gl, bh);
729
730 kaddr = kmap_atomic(page);
731 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
732 nbytes = PAGE_CACHE_SIZE - offset;
733 memcpy(kaddr + offset, ptr, nbytes);
734 flush_dcache_page(page);
735 kunmap_atomic(kaddr);
736 unlock_page(page);
737 page_cache_release(page);
738
739 /* If quota straddles page boundary, we need to update the rest of the
740 * quota at the beginning of the next page */
741 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
742 ptr = ptr + nbytes;
743 nbytes = sizeof(struct gfs2_quota) - nbytes;
744 offset = 0;
745 index++;
746 goto get_a_page;
747 }
748
749 size = loc + sizeof(struct gfs2_quota);
750 if (size > inode->i_size)
751 i_size_write(inode, size);
752 inode->i_mtime = inode->i_atime = CURRENT_TIME;
753 mark_inode_dirty(inode);
754 return 0;
755
756 unlock_out:
757 unlock_page(page);
758 page_cache_release(page);
759 return err;
760 }
761
762 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
763 {
764 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
765 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
766 unsigned int data_blocks, ind_blocks;
767 struct gfs2_holder *ghs, i_gh;
768 unsigned int qx, x;
769 struct gfs2_quota_data *qd;
770 unsigned reserved;
771 loff_t offset;
772 unsigned int nalloc = 0, blocks;
773 int error;
774
775 error = gfs2_rs_alloc(ip);
776 if (error)
777 return error;
778
779 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
780 &data_blocks, &ind_blocks);
781
782 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
783 if (!ghs)
784 return -ENOMEM;
785
786 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
787 mutex_lock(&ip->i_inode.i_mutex);
788 for (qx = 0; qx < num_qd; qx++) {
789 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
790 GL_NOCACHE, &ghs[qx]);
791 if (error)
792 goto out;
793 }
794
795 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
796 if (error)
797 goto out;
798
799 for (x = 0; x < num_qd; x++) {
800 offset = qd2offset(qda[x]);
801 if (gfs2_write_alloc_required(ip, offset,
802 sizeof(struct gfs2_quota)))
803 nalloc++;
804 }
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 /* +3 in the end for unstuffing block, inode size update block
813 * and another block in case quota straddles page boundary and
814 * two blocks need to be updated instead of 1 */
815 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
816
817 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
818 error = gfs2_inplace_reserve(ip, reserved, 0);
819 if (error)
820 goto out_alloc;
821
822 if (nalloc)
823 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
824
825 error = gfs2_trans_begin(sdp, blocks, 0);
826 if (error)
827 goto out_ipres;
828
829 for (x = 0; x < num_qd; x++) {
830 qd = qda[x];
831 offset = qd2offset(qd);
832 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
833 if (error)
834 goto out_end_trans;
835
836 do_qc(qd, -qd->qd_change_sync);
837 set_bit(QDF_REFRESH, &qd->qd_flags);
838 }
839
840 error = 0;
841
842 out_end_trans:
843 gfs2_trans_end(sdp);
844 out_ipres:
845 gfs2_inplace_release(ip);
846 out_alloc:
847 gfs2_glock_dq_uninit(&i_gh);
848 out:
849 while (qx--)
850 gfs2_glock_dq_uninit(&ghs[qx]);
851 mutex_unlock(&ip->i_inode.i_mutex);
852 kfree(ghs);
853 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
854 return error;
855 }
856
857 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
858 {
859 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
860 struct gfs2_quota q;
861 struct gfs2_quota_lvb *qlvb;
862 loff_t pos;
863 int error;
864
865 memset(&q, 0, sizeof(struct gfs2_quota));
866 pos = qd2offset(qd);
867 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
868 if (error < 0)
869 return error;
870
871 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
872 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
873 qlvb->__pad = 0;
874 qlvb->qb_limit = q.qu_limit;
875 qlvb->qb_warn = q.qu_warn;
876 qlvb->qb_value = q.qu_value;
877 qd->qd_qb = *qlvb;
878
879 return 0;
880 }
881
882 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
883 struct gfs2_holder *q_gh)
884 {
885 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
886 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
887 struct gfs2_holder i_gh;
888 int error;
889
890 restart:
891 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
892 if (error)
893 return error;
894
895 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
896
897 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
898 gfs2_glock_dq_uninit(q_gh);
899 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
900 GL_NOCACHE, q_gh);
901 if (error)
902 return error;
903
904 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
905 if (error)
906 goto fail;
907
908 error = update_qd(sdp, qd);
909 if (error)
910 goto fail_gunlock;
911
912 gfs2_glock_dq_uninit(&i_gh);
913 gfs2_glock_dq_uninit(q_gh);
914 force_refresh = 0;
915 goto restart;
916 }
917
918 return 0;
919
920 fail_gunlock:
921 gfs2_glock_dq_uninit(&i_gh);
922 fail:
923 gfs2_glock_dq_uninit(q_gh);
924 return error;
925 }
926
927 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
928 {
929 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
930 struct gfs2_quota_data *qd;
931 unsigned int x;
932 int error = 0;
933
934 error = gfs2_quota_hold(ip, uid, gid);
935 if (error)
936 return error;
937
938 if (capable(CAP_SYS_RESOURCE) ||
939 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
940 return 0;
941
942 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
943 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
944
945 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
946 int force = NO_FORCE;
947 qd = ip->i_res->rs_qa_qd[x];
948 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
949 force = FORCE;
950 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
951 if (error)
952 break;
953 }
954
955 if (!error)
956 set_bit(GIF_QD_LOCKED, &ip->i_flags);
957 else {
958 while (x--)
959 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
960 gfs2_quota_unhold(ip);
961 }
962
963 return error;
964 }
965
966 static int need_sync(struct gfs2_quota_data *qd)
967 {
968 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
969 struct gfs2_tune *gt = &sdp->sd_tune;
970 s64 value;
971 unsigned int num, den;
972 int do_sync = 1;
973
974 if (!qd->qd_qb.qb_limit)
975 return 0;
976
977 spin_lock(&qd_lru_lock);
978 value = qd->qd_change;
979 spin_unlock(&qd_lru_lock);
980
981 spin_lock(&gt->gt_spin);
982 num = gt->gt_quota_scale_num;
983 den = gt->gt_quota_scale_den;
984 spin_unlock(&gt->gt_spin);
985
986 if (value < 0)
987 do_sync = 0;
988 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
989 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
990 do_sync = 0;
991 else {
992 value *= gfs2_jindex_size(sdp) * num;
993 value = div_s64(value, den);
994 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
995 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
996 do_sync = 0;
997 }
998
999 return do_sync;
1000 }
1001
1002 void gfs2_quota_unlock(struct gfs2_inode *ip)
1003 {
1004 struct gfs2_quota_data *qda[4];
1005 unsigned int count = 0;
1006 unsigned int x;
1007
1008 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1009 goto out;
1010
1011 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1012 struct gfs2_quota_data *qd;
1013 int sync;
1014
1015 qd = ip->i_res->rs_qa_qd[x];
1016 sync = need_sync(qd);
1017
1018 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1019
1020 if (sync && qd_trylock(qd))
1021 qda[count++] = qd;
1022 }
1023
1024 if (count) {
1025 do_sync(count, qda);
1026 for (x = 0; x < count; x++)
1027 qd_unlock(qda[x]);
1028 }
1029
1030 out:
1031 gfs2_quota_unhold(ip);
1032 }
1033
1034 #define MAX_LINE 256
1035
1036 static int print_message(struct gfs2_quota_data *qd, char *type)
1037 {
1038 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1039
1040 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1041 sdp->sd_fsname, type,
1042 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1043 from_kqid(&init_user_ns, qd->qd_id));
1044
1045 return 0;
1046 }
1047
1048 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1049 {
1050 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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 < ip->i_res->rs_qa_qd_num; x++) {
1063 qd = ip->i_res->rs_qa_qd[x];
1064
1065 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1066 qid_eq(qd->qd_id, make_kqid_gid(gid))))
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(qd->qd_id,
1077 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1078
1079 error = -EDQUOT;
1080 break;
1081 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1082 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1083 time_after_eq(jiffies, qd->qd_last_warn +
1084 gfs2_tune_get(sdp,
1085 gt_quota_warn_period) * HZ)) {
1086 quota_send_warning(qd->qd_id,
1087 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1088 error = print_message(qd, "warning");
1089 qd->qd_last_warn = jiffies;
1090 }
1091 }
1092
1093 return error;
1094 }
1095
1096 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1097 kuid_t uid, kgid_t gid)
1098 {
1099 struct gfs2_quota_data *qd;
1100 unsigned int x;
1101
1102 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1103 return;
1104 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1105 return;
1106
1107 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1108 qd = ip->i_res->rs_qa_qd[x];
1109
1110 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1111 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1112 do_qc(qd, change);
1113 }
1114 }
1115 }
1116
1117 int gfs2_quota_sync(struct super_block *sb, int type)
1118 {
1119 struct gfs2_sbd *sdp = sb->s_fs_info;
1120 struct gfs2_quota_data **qda;
1121 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1122 unsigned int num_qd;
1123 unsigned int x;
1124 int error = 0;
1125
1126 sdp->sd_quota_sync_gen++;
1127
1128 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1129 if (!qda)
1130 return -ENOMEM;
1131
1132 do {
1133 num_qd = 0;
1134
1135 for (;;) {
1136 error = qd_fish(sdp, qda + num_qd);
1137 if (error || !qda[num_qd])
1138 break;
1139 if (++num_qd == max_qd)
1140 break;
1141 }
1142
1143 if (num_qd) {
1144 if (!error)
1145 error = do_sync(num_qd, qda);
1146 if (!error)
1147 for (x = 0; x < num_qd; x++)
1148 qda[x]->qd_sync_gen =
1149 sdp->sd_quota_sync_gen;
1150
1151 for (x = 0; x < num_qd; x++)
1152 qd_unlock(qda[x]);
1153 }
1154 } while (!error && num_qd == max_qd);
1155
1156 kfree(qda);
1157
1158 return error;
1159 }
1160
1161 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1162 {
1163 struct gfs2_quota_data *qd;
1164 struct gfs2_holder q_gh;
1165 int error;
1166
1167 error = qd_get(sdp, qid, &qd);
1168 if (error)
1169 return error;
1170
1171 error = do_glock(qd, FORCE, &q_gh);
1172 if (!error)
1173 gfs2_glock_dq_uninit(&q_gh);
1174
1175 qd_put(qd);
1176 return error;
1177 }
1178
1179 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1180 {
1181 const struct gfs2_quota_change *str = buf;
1182
1183 qc->qc_change = be64_to_cpu(str->qc_change);
1184 qc->qc_flags = be32_to_cpu(str->qc_flags);
1185 qc->qc_id = make_kqid(&init_user_ns,
1186 (qc->qc_flags & GFS2_QCF_USER)?USRQUOTA:GRPQUOTA,
1187 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 u64 size = i_size_read(sdp->sd_qc_inode);
1194 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1195 unsigned int x, slot = 0;
1196 unsigned int found = 0;
1197 u64 dblock;
1198 u32 extlen = 0;
1199 int error;
1200
1201 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1202 return -EIO;
1203
1204 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1205 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1206
1207 error = -ENOMEM;
1208
1209 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1210 sizeof(unsigned char *), GFP_NOFS);
1211 if (!sdp->sd_quota_bitmap)
1212 return error;
1213
1214 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1215 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1216 if (!sdp->sd_quota_bitmap[x])
1217 goto fail;
1218 }
1219
1220 for (x = 0; x < blocks; x++) {
1221 struct buffer_head *bh;
1222 unsigned int y;
1223
1224 if (!extlen) {
1225 int new = 0;
1226 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1227 if (error)
1228 goto fail;
1229 }
1230 error = -EIO;
1231 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1232 if (!bh)
1233 goto fail;
1234 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1235 brelse(bh);
1236 goto fail;
1237 }
1238
1239 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1240 y++, slot++) {
1241 struct gfs2_quota_change_host qc;
1242 struct gfs2_quota_data *qd;
1243
1244 gfs2_quota_change_in(&qc, bh->b_data +
1245 sizeof(struct gfs2_meta_header) +
1246 y * sizeof(struct gfs2_quota_change));
1247 if (!qc.qc_change)
1248 continue;
1249
1250 error = qd_alloc(sdp, qc.qc_id, &qd);
1251 if (error) {
1252 brelse(bh);
1253 goto fail;
1254 }
1255
1256 set_bit(QDF_CHANGE, &qd->qd_flags);
1257 qd->qd_change = qc.qc_change;
1258 qd->qd_slot = slot;
1259 qd->qd_slot_count = 1;
1260
1261 spin_lock(&qd_lru_lock);
1262 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1263 list_add(&qd->qd_list, &sdp->sd_quota_list);
1264 atomic_inc(&sdp->sd_quota_count);
1265 spin_unlock(&qd_lru_lock);
1266
1267 found++;
1268 }
1269
1270 brelse(bh);
1271 dblock++;
1272 extlen--;
1273 }
1274
1275 if (found)
1276 fs_info(sdp, "found %u quota changes\n", found);
1277
1278 return 0;
1279
1280 fail:
1281 gfs2_quota_cleanup(sdp);
1282 return error;
1283 }
1284
1285 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1286 {
1287 struct list_head *head = &sdp->sd_quota_list;
1288 struct gfs2_quota_data *qd;
1289 unsigned int x;
1290
1291 spin_lock(&qd_lru_lock);
1292 while (!list_empty(head)) {
1293 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1294
1295 if (atomic_read(&qd->qd_count) > 1 ||
1296 (atomic_read(&qd->qd_count) &&
1297 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1298 list_move(&qd->qd_list, head);
1299 spin_unlock(&qd_lru_lock);
1300 schedule();
1301 spin_lock(&qd_lru_lock);
1302 continue;
1303 }
1304
1305 list_del(&qd->qd_list);
1306 /* Also remove if this qd exists in the reclaim list */
1307 if (!list_empty(&qd->qd_reclaim)) {
1308 list_del_init(&qd->qd_reclaim);
1309 atomic_dec(&qd_lru_count);
1310 }
1311 atomic_dec(&sdp->sd_quota_count);
1312 spin_unlock(&qd_lru_lock);
1313
1314 if (!atomic_read(&qd->qd_count)) {
1315 gfs2_assert_warn(sdp, !qd->qd_change);
1316 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1317 } else
1318 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1319 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1320
1321 gfs2_glock_put(qd->qd_gl);
1322 kmem_cache_free(gfs2_quotad_cachep, qd);
1323
1324 spin_lock(&qd_lru_lock);
1325 }
1326 spin_unlock(&qd_lru_lock);
1327
1328 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1329
1330 if (sdp->sd_quota_bitmap) {
1331 for (x = 0; x < sdp->sd_quota_chunks; x++)
1332 kfree(sdp->sd_quota_bitmap[x]);
1333 kfree(sdp->sd_quota_bitmap);
1334 }
1335 }
1336
1337 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1338 {
1339 if (error == 0 || error == -EROFS)
1340 return;
1341 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1342 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1343 }
1344
1345 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1346 int (*fxn)(struct super_block *sb, int type),
1347 unsigned long t, unsigned long *timeo,
1348 unsigned int *new_timeo)
1349 {
1350 if (t >= *timeo) {
1351 int error = fxn(sdp->sd_vfs, 0);
1352 quotad_error(sdp, msg, error);
1353 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1354 } else {
1355 *timeo -= t;
1356 }
1357 }
1358
1359 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1360 {
1361 struct gfs2_inode *ip;
1362
1363 while(1) {
1364 ip = NULL;
1365 spin_lock(&sdp->sd_trunc_lock);
1366 if (!list_empty(&sdp->sd_trunc_list)) {
1367 ip = list_entry(sdp->sd_trunc_list.next,
1368 struct gfs2_inode, i_trunc_list);
1369 list_del_init(&ip->i_trunc_list);
1370 }
1371 spin_unlock(&sdp->sd_trunc_lock);
1372 if (ip == NULL)
1373 return;
1374 gfs2_glock_finish_truncate(ip);
1375 }
1376 }
1377
1378 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1379 if (!sdp->sd_statfs_force_sync) {
1380 sdp->sd_statfs_force_sync = 1;
1381 wake_up(&sdp->sd_quota_wait);
1382 }
1383 }
1384
1385
1386 /**
1387 * gfs2_quotad - Write cached quota changes into the quota file
1388 * @sdp: Pointer to GFS2 superblock
1389 *
1390 */
1391
1392 int gfs2_quotad(void *data)
1393 {
1394 struct gfs2_sbd *sdp = data;
1395 struct gfs2_tune *tune = &sdp->sd_tune;
1396 unsigned long statfs_timeo = 0;
1397 unsigned long quotad_timeo = 0;
1398 unsigned long t = 0;
1399 DEFINE_WAIT(wait);
1400 int empty;
1401
1402 while (!kthread_should_stop()) {
1403
1404 /* Update the master statfs file */
1405 if (sdp->sd_statfs_force_sync) {
1406 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1407 quotad_error(sdp, "statfs", error);
1408 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1409 }
1410 else
1411 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1412 &statfs_timeo,
1413 &tune->gt_statfs_quantum);
1414
1415 /* Update quota file */
1416 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1417 &quotad_timeo, &tune->gt_quota_quantum);
1418
1419 /* Check for & recover partially truncated inodes */
1420 quotad_check_trunc_list(sdp);
1421
1422 try_to_freeze();
1423
1424 t = min(quotad_timeo, statfs_timeo);
1425
1426 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1427 spin_lock(&sdp->sd_trunc_lock);
1428 empty = list_empty(&sdp->sd_trunc_list);
1429 spin_unlock(&sdp->sd_trunc_lock);
1430 if (empty && !sdp->sd_statfs_force_sync)
1431 t -= schedule_timeout(t);
1432 else
1433 t = 0;
1434 finish_wait(&sdp->sd_quota_wait, &wait);
1435 }
1436
1437 return 0;
1438 }
1439
1440 static int gfs2_quota_get_xstate(struct super_block *sb,
1441 struct fs_quota_stat *fqs)
1442 {
1443 struct gfs2_sbd *sdp = sb->s_fs_info;
1444
1445 memset(fqs, 0, sizeof(struct fs_quota_stat));
1446 fqs->qs_version = FS_QSTAT_VERSION;
1447
1448 switch (sdp->sd_args.ar_quota) {
1449 case GFS2_QUOTA_ON:
1450 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1451 /*FALLTHRU*/
1452 case GFS2_QUOTA_ACCOUNT:
1453 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1454 break;
1455 case GFS2_QUOTA_OFF:
1456 break;
1457 }
1458
1459 if (sdp->sd_quota_inode) {
1460 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1461 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1462 }
1463 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1464 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1465 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1466 return 0;
1467 }
1468
1469 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1470 struct fs_disk_quota *fdq)
1471 {
1472 struct gfs2_sbd *sdp = sb->s_fs_info;
1473 struct gfs2_quota_lvb *qlvb;
1474 struct gfs2_quota_data *qd;
1475 struct gfs2_holder q_gh;
1476 int error;
1477
1478 memset(fdq, 0, sizeof(struct fs_disk_quota));
1479
1480 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1481 return -ESRCH; /* Crazy XFS error code */
1482
1483 if ((qid.type != USRQUOTA) &&
1484 (qid.type != GRPQUOTA))
1485 return -EINVAL;
1486
1487 error = qd_get(sdp, qid, &qd);
1488 if (error)
1489 return error;
1490 error = do_glock(qd, FORCE, &q_gh);
1491 if (error)
1492 goto out;
1493
1494 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1495 fdq->d_version = FS_DQUOT_VERSION;
1496 fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1497 fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1498 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1499 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1500 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1501
1502 gfs2_glock_dq_uninit(&q_gh);
1503 out:
1504 qd_put(qd);
1505 return error;
1506 }
1507
1508 /* GFS2 only supports a subset of the XFS fields */
1509 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1510
1511 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1512 struct fs_disk_quota *fdq)
1513 {
1514 struct gfs2_sbd *sdp = sb->s_fs_info;
1515 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1516 struct gfs2_quota_data *qd;
1517 struct gfs2_holder q_gh, i_gh;
1518 unsigned int data_blocks, ind_blocks;
1519 unsigned int blocks = 0;
1520 int alloc_required;
1521 loff_t offset;
1522 int error;
1523
1524 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1525 return -ESRCH; /* Crazy XFS error code */
1526
1527 if ((qid.type != USRQUOTA) &&
1528 (qid.type != GRPQUOTA))
1529 return -EINVAL;
1530
1531 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1532 return -EINVAL;
1533
1534 error = qd_get(sdp, qid, &qd);
1535 if (error)
1536 return error;
1537
1538 error = gfs2_rs_alloc(ip);
1539 if (error)
1540 goto out_put;
1541
1542 mutex_lock(&ip->i_inode.i_mutex);
1543 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1544 if (error)
1545 goto out_unlockput;
1546 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1547 if (error)
1548 goto out_q;
1549
1550 /* Check for existing entry, if none then alloc new blocks */
1551 error = update_qd(sdp, qd);
1552 if (error)
1553 goto out_i;
1554
1555 /* If nothing has changed, this is a no-op */
1556 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1557 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1558 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1559
1560 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1561 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1562 fdq->d_fieldmask ^= FS_DQ_BHARD;
1563
1564 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1565 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1566 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1567
1568 if (fdq->d_fieldmask == 0)
1569 goto out_i;
1570
1571 offset = qd2offset(qd);
1572 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1573 if (gfs2_is_stuffed(ip))
1574 alloc_required = 1;
1575 if (alloc_required) {
1576 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1577 &data_blocks, &ind_blocks);
1578 blocks = 1 + data_blocks + ind_blocks;
1579 error = gfs2_inplace_reserve(ip, blocks, 0);
1580 if (error)
1581 goto out_i;
1582 blocks += gfs2_rg_blocks(ip, blocks);
1583 }
1584
1585 /* Some quotas span block boundaries and can update two blocks,
1586 adding an extra block to the transaction to handle such quotas */
1587 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1588 if (error)
1589 goto out_release;
1590
1591 /* Apply changes */
1592 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1593
1594 gfs2_trans_end(sdp);
1595 out_release:
1596 if (alloc_required)
1597 gfs2_inplace_release(ip);
1598 out_i:
1599 gfs2_glock_dq_uninit(&i_gh);
1600 out_q:
1601 gfs2_glock_dq_uninit(&q_gh);
1602 out_unlockput:
1603 mutex_unlock(&ip->i_inode.i_mutex);
1604 out_put:
1605 qd_put(qd);
1606 return error;
1607 }
1608
1609 const struct quotactl_ops gfs2_quotactl_ops = {
1610 .quota_sync = gfs2_quota_sync,
1611 .get_xstate = gfs2_quota_get_xstate,
1612 .get_dqblk = gfs2_get_dqblk,
1613 .set_dqblk = gfs2_set_dqblk,
1614 };
Linux with added FPC-III support