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Linux 3.8-rc7
[cris-mirror.git] / fs / gfs2 / quota.c
blobae55e248c3b75054bd2ade8438eb9cd09f88ec5c
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_quota_data **qd;
498 int error;
499
500 if (ip->i_res == NULL) {
501 error = gfs2_rs_alloc(ip);
502 if (error)
503 return error;
504 }
505
506 qd = ip->i_res->rs_qa_qd;
507
508 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
509 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
510 return -EIO;
511
512 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
513 return 0;
514
515 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
516 if (error)
517 goto out;
518 ip->i_res->rs_qa_qd_num++;
519 qd++;
520
521 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
522 if (error)
523 goto out;
524 ip->i_res->rs_qa_qd_num++;
525 qd++;
526
527 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
528 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
529 if (error)
530 goto out;
531 ip->i_res->rs_qa_qd_num++;
532 qd++;
533 }
534
535 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
536 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
537 if (error)
538 goto out;
539 ip->i_res->rs_qa_qd_num++;
540 qd++;
541 }
542
543 out:
544 if (error)
545 gfs2_quota_unhold(ip);
546 return error;
547 }
548
549 void gfs2_quota_unhold(struct gfs2_inode *ip)
550 {
551 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
552 unsigned int x;
553
554 if (ip->i_res == NULL)
555 return;
556 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
557
558 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
559 qdsb_put(ip->i_res->rs_qa_qd[x]);
560 ip->i_res->rs_qa_qd[x] = NULL;
561 }
562 ip->i_res->rs_qa_qd_num = 0;
563 }
564
565 static int sort_qd(const void *a, const void *b)
566 {
567 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
568 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
569
570 if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
571 !test_bit(QDF_USER, &qd_b->qd_flags)) {
572 if (test_bit(QDF_USER, &qd_a->qd_flags))
573 return -1;
574 else
575 return 1;
576 }
577 if (qd_a->qd_id < qd_b->qd_id)
578 return -1;
579 if (qd_a->qd_id > qd_b->qd_id)
580 return 1;
581
582 return 0;
583 }
584
585 static void do_qc(struct gfs2_quota_data *qd, s64 change)
586 {
587 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
588 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
589 struct gfs2_quota_change *qc = qd->qd_bh_qc;
590 s64 x;
591
592 mutex_lock(&sdp->sd_quota_mutex);
593 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
594
595 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
596 qc->qc_change = 0;
597 qc->qc_flags = 0;
598 if (test_bit(QDF_USER, &qd->qd_flags))
599 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
600 qc->qc_id = cpu_to_be32(qd->qd_id);
601 }
602
603 x = be64_to_cpu(qc->qc_change) + change;
604 qc->qc_change = cpu_to_be64(x);
605
606 spin_lock(&qd_lru_lock);
607 qd->qd_change = x;
608 spin_unlock(&qd_lru_lock);
609
610 if (!x) {
611 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
612 clear_bit(QDF_CHANGE, &qd->qd_flags);
613 qc->qc_flags = 0;
614 qc->qc_id = 0;
615 slot_put(qd);
616 qd_put(qd);
617 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
618 qd_hold(qd);
619 slot_hold(qd);
620 }
621
622 mutex_unlock(&sdp->sd_quota_mutex);
623 }
624
625 /**
626 * gfs2_adjust_quota - adjust record of current block usage
627 * @ip: The quota inode
628 * @loc: Offset of the entry in the quota file
629 * @change: The amount of usage change to record
630 * @qd: The quota data
631 * @fdq: The updated limits to record
632 *
633 * This function was mostly borrowed from gfs2_block_truncate_page which was
634 * in turn mostly borrowed from ext3
635 *
636 * Returns: 0 or -ve on error
637 */
638
639 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
640 s64 change, struct gfs2_quota_data *qd,
641 struct fs_disk_quota *fdq)
642 {
643 struct inode *inode = &ip->i_inode;
644 struct gfs2_sbd *sdp = GFS2_SB(inode);
645 struct address_space *mapping = inode->i_mapping;
646 unsigned long index = loc >> PAGE_CACHE_SHIFT;
647 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
648 unsigned blocksize, iblock, pos;
649 struct buffer_head *bh;
650 struct page *page;
651 void *kaddr, *ptr;
652 struct gfs2_quota q, *qp;
653 int err, nbytes;
654 u64 size;
655
656 if (gfs2_is_stuffed(ip)) {
657 err = gfs2_unstuff_dinode(ip, NULL);
658 if (err)
659 return err;
660 }
661
662 memset(&q, 0, sizeof(struct gfs2_quota));
663 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
664 if (err < 0)
665 return err;
666
667 err = -EIO;
668 qp = &q;
669 qp->qu_value = be64_to_cpu(qp->qu_value);
670 qp->qu_value += change;
671 qp->qu_value = cpu_to_be64(qp->qu_value);
672 qd->qd_qb.qb_value = qp->qu_value;
673 if (fdq) {
674 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
675 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
676 qd->qd_qb.qb_warn = qp->qu_warn;
677 }
678 if (fdq->d_fieldmask & FS_DQ_BHARD) {
679 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
680 qd->qd_qb.qb_limit = qp->qu_limit;
681 }
682 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
683 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
684 qd->qd_qb.qb_value = qp->qu_value;
685 }
686 }
687
688 /* Write the quota into the quota file on disk */
689 ptr = qp;
690 nbytes = sizeof(struct gfs2_quota);
691 get_a_page:
692 page = find_or_create_page(mapping, index, GFP_NOFS);
693 if (!page)
694 return -ENOMEM;
695
696 blocksize = inode->i_sb->s_blocksize;
697 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
698
699 if (!page_has_buffers(page))
700 create_empty_buffers(page, blocksize, 0);
701
702 bh = page_buffers(page);
703 pos = blocksize;
704 while (offset >= pos) {
705 bh = bh->b_this_page;
706 iblock++;
707 pos += blocksize;
708 }
709
710 if (!buffer_mapped(bh)) {
711 gfs2_block_map(inode, iblock, bh, 1);
712 if (!buffer_mapped(bh))
713 goto unlock_out;
714 /* If it's a newly allocated disk block for quota, zero it */
715 if (buffer_new(bh))
716 zero_user(page, pos - blocksize, bh->b_size);
717 }
718
719 if (PageUptodate(page))
720 set_buffer_uptodate(bh);
721
722 if (!buffer_uptodate(bh)) {
723 ll_rw_block(READ | REQ_META, 1, &bh);
724 wait_on_buffer(bh);
725 if (!buffer_uptodate(bh))
726 goto unlock_out;
727 }
728
729 gfs2_trans_add_bh(ip->i_gl, bh, 0);
730
731 kaddr = kmap_atomic(page);
732 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
733 nbytes = PAGE_CACHE_SIZE - offset;
734 memcpy(kaddr + offset, ptr, nbytes);
735 flush_dcache_page(page);
736 kunmap_atomic(kaddr);
737 unlock_page(page);
738 page_cache_release(page);
739
740 /* If quota straddles page boundary, we need to update the rest of the
741 * quota at the beginning of the next page */
742 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
743 ptr = ptr + nbytes;
744 nbytes = sizeof(struct gfs2_quota) - nbytes;
745 offset = 0;
746 index++;
747 goto get_a_page;
748 }
749
750 size = loc + sizeof(struct gfs2_quota);
751 if (size > inode->i_size)
752 i_size_write(inode, size);
753 inode->i_mtime = inode->i_atime = CURRENT_TIME;
754 mark_inode_dirty(inode);
755 return 0;
756
757 unlock_out:
758 unlock_page(page);
759 page_cache_release(page);
760 return err;
761 }
762
763 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
764 {
765 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
766 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
767 unsigned int data_blocks, ind_blocks;
768 struct gfs2_holder *ghs, i_gh;
769 unsigned int qx, x;
770 struct gfs2_quota_data *qd;
771 unsigned reserved;
772 loff_t offset;
773 unsigned int nalloc = 0, blocks;
774 int error;
775
776 error = gfs2_rs_alloc(ip);
777 if (error)
778 return error;
779
780 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
781 &data_blocks, &ind_blocks);
782
783 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
784 if (!ghs)
785 return -ENOMEM;
786
787 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
788 mutex_lock(&ip->i_inode.i_mutex);
789 for (qx = 0; qx < num_qd; qx++) {
790 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
791 GL_NOCACHE, &ghs[qx]);
792 if (error)
793 goto out;
794 }
795
796 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
797 if (error)
798 goto out;
799
800 for (x = 0; x < num_qd; x++) {
801 offset = qd2offset(qda[x]);
802 if (gfs2_write_alloc_required(ip, offset,
803 sizeof(struct gfs2_quota)))
804 nalloc++;
805 }
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 /* +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 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
819 error = gfs2_inplace_reserve(ip, reserved, 0);
820 if (error)
821 goto out_alloc;
822
823 if (nalloc)
824 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
825
826 error = gfs2_trans_begin(sdp, blocks, 0);
827 if (error)
828 goto out_ipres;
829
830 for (x = 0; x < num_qd; x++) {
831 qd = qda[x];
832 offset = qd2offset(qd);
833 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
834 if (error)
835 goto out_end_trans;
836
837 do_qc(qd, -qd->qd_change_sync);
838 set_bit(QDF_REFRESH, &qd->qd_flags);
839 }
840
841 error = 0;
842
843 out_end_trans:
844 gfs2_trans_end(sdp);
845 out_ipres:
846 gfs2_inplace_release(ip);
847 out_alloc:
848 gfs2_glock_dq_uninit(&i_gh);
849 out:
850 while (qx--)
851 gfs2_glock_dq_uninit(&ghs[qx]);
852 mutex_unlock(&ip->i_inode.i_mutex);
853 kfree(ghs);
854 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
855 return error;
856 }
857
858 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
859 {
860 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
861 struct gfs2_quota q;
862 struct gfs2_quota_lvb *qlvb;
863 loff_t pos;
864 int error;
865
866 memset(&q, 0, sizeof(struct gfs2_quota));
867 pos = qd2offset(qd);
868 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
869 if (error < 0)
870 return error;
871
872 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
873 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
874 qlvb->__pad = 0;
875 qlvb->qb_limit = q.qu_limit;
876 qlvb->qb_warn = q.qu_warn;
877 qlvb->qb_value = q.qu_value;
878 qd->qd_qb = *qlvb;
879
880 return 0;
881 }
882
883 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
884 struct gfs2_holder *q_gh)
885 {
886 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
887 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
888 struct gfs2_holder i_gh;
889 int error;
890
891 restart:
892 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
893 if (error)
894 return error;
895
896 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
897
898 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
899 gfs2_glock_dq_uninit(q_gh);
900 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
901 GL_NOCACHE, q_gh);
902 if (error)
903 return error;
904
905 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
906 if (error)
907 goto fail;
908
909 error = update_qd(sdp, qd);
910 if (error)
911 goto fail_gunlock;
912
913 gfs2_glock_dq_uninit(&i_gh);
914 gfs2_glock_dq_uninit(q_gh);
915 force_refresh = 0;
916 goto restart;
917 }
918
919 return 0;
920
921 fail_gunlock:
922 gfs2_glock_dq_uninit(&i_gh);
923 fail:
924 gfs2_glock_dq_uninit(q_gh);
925 return error;
926 }
927
928 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
929 {
930 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
931 struct gfs2_quota_data *qd;
932 unsigned int x;
933 int error = 0;
934
935 error = gfs2_quota_hold(ip, uid, gid);
936 if (error)
937 return error;
938
939 if (capable(CAP_SYS_RESOURCE) ||
940 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
941 return 0;
942
943 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
944 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
945
946 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
947 int force = NO_FORCE;
948 qd = ip->i_res->rs_qa_qd[x];
949 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
950 force = FORCE;
951 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
952 if (error)
953 break;
954 }
955
956 if (!error)
957 set_bit(GIF_QD_LOCKED, &ip->i_flags);
958 else {
959 while (x--)
960 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
961 gfs2_quota_unhold(ip);
962 }
963
964 return error;
965 }
966
967 static int need_sync(struct gfs2_quota_data *qd)
968 {
969 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
970 struct gfs2_tune *gt = &sdp->sd_tune;
971 s64 value;
972 unsigned int num, den;
973 int do_sync = 1;
974
975 if (!qd->qd_qb.qb_limit)
976 return 0;
977
978 spin_lock(&qd_lru_lock);
979 value = qd->qd_change;
980 spin_unlock(&qd_lru_lock);
981
982 spin_lock(&gt->gt_spin);
983 num = gt->gt_quota_scale_num;
984 den = gt->gt_quota_scale_den;
985 spin_unlock(&gt->gt_spin);
986
987 if (value < 0)
988 do_sync = 0;
989 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
990 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
991 do_sync = 0;
992 else {
993 value *= gfs2_jindex_size(sdp) * num;
994 value = div_s64(value, den);
995 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
996 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
997 do_sync = 0;
998 }
999
1000 return do_sync;
1001 }
1002
1003 void gfs2_quota_unlock(struct gfs2_inode *ip)
1004 {
1005 struct gfs2_quota_data *qda[4];
1006 unsigned int count = 0;
1007 unsigned int x;
1008
1009 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1010 goto out;
1011
1012 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1013 struct gfs2_quota_data *qd;
1014 int sync;
1015
1016 qd = ip->i_res->rs_qa_qd[x];
1017 sync = need_sync(qd);
1018
1019 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1020
1021 if (sync && qd_trylock(qd))
1022 qda[count++] = qd;
1023 }
1024
1025 if (count) {
1026 do_sync(count, qda);
1027 for (x = 0; x < count; x++)
1028 qd_unlock(qda[x]);
1029 }
1030
1031 out:
1032 gfs2_quota_unhold(ip);
1033 }
1034
1035 #define MAX_LINE 256
1036
1037 static int print_message(struct gfs2_quota_data *qd, char *type)
1038 {
1039 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1040
1041 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1042 sdp->sd_fsname, type,
1043 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1044 qd->qd_id);
1045
1046 return 0;
1047 }
1048
1049 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1050 {
1051 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1052 struct gfs2_quota_data *qd;
1053 s64 value;
1054 unsigned int x;
1055 int error = 0;
1056
1057 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1058 return 0;
1059
1060 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1061 return 0;
1062
1063 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1064 qd = ip->i_res->rs_qa_qd[x];
1065
1066 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1067 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1068 continue;
1069
1070 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1071 spin_lock(&qd_lru_lock);
1072 value += qd->qd_change;
1073 spin_unlock(&qd_lru_lock);
1074
1075 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1076 print_message(qd, "exceeded");
1077 quota_send_warning(make_kqid(&init_user_ns,
1078 test_bit(QDF_USER, &qd->qd_flags) ?
1079 USRQUOTA : GRPQUOTA,
1080 qd->qd_id),
1081 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1082
1083 error = -EDQUOT;
1084 break;
1085 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1086 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1087 time_after_eq(jiffies, qd->qd_last_warn +
1088 gfs2_tune_get(sdp,
1089 gt_quota_warn_period) * HZ)) {
1090 quota_send_warning(make_kqid(&init_user_ns,
1091 test_bit(QDF_USER, &qd->qd_flags) ?
1092 USRQUOTA : GRPQUOTA,
1093 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_quota_data *qd;
1107 unsigned int x;
1108
1109 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1110 return;
1111 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1112 return;
1113
1114 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1115 qd = ip->i_res->rs_qa_qd[x];
1116
1117 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1118 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1119 do_qc(qd, change);
1120 }
1121 }
1122 }
1123
1124 int gfs2_quota_sync(struct super_block *sb, int type)
1125 {
1126 struct gfs2_sbd *sdp = sb->s_fs_info;
1127 struct gfs2_quota_data **qda;
1128 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1129 unsigned int num_qd;
1130 unsigned int x;
1131 int error = 0;
1132
1133 sdp->sd_quota_sync_gen++;
1134
1135 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1136 if (!qda)
1137 return -ENOMEM;
1138
1139 do {
1140 num_qd = 0;
1141
1142 for (;;) {
1143 error = qd_fish(sdp, qda + num_qd);
1144 if (error || !qda[num_qd])
1145 break;
1146 if (++num_qd == max_qd)
1147 break;
1148 }
1149
1150 if (num_qd) {
1151 if (!error)
1152 error = do_sync(num_qd, qda);
1153 if (!error)
1154 for (x = 0; x < num_qd; x++)
1155 qda[x]->qd_sync_gen =
1156 sdp->sd_quota_sync_gen;
1157
1158 for (x = 0; x < num_qd; x++)
1159 qd_unlock(qda[x]);
1160 }
1161 } while (!error && num_qd == max_qd);
1162
1163 kfree(qda);
1164
1165 return error;
1166 }
1167
1168 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1169 {
1170 return gfs2_quota_sync(sb, type);
1171 }
1172
1173 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1174 {
1175 struct gfs2_quota_data *qd;
1176 struct gfs2_holder q_gh;
1177 int error;
1178
1179 error = qd_get(sdp, user, id, &qd);
1180 if (error)
1181 return error;
1182
1183 error = do_glock(qd, FORCE, &q_gh);
1184 if (!error)
1185 gfs2_glock_dq_uninit(&q_gh);
1186
1187 qd_put(qd);
1188 return error;
1189 }
1190
1191 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1192 {
1193 const struct gfs2_quota_change *str = buf;
1194
1195 qc->qc_change = be64_to_cpu(str->qc_change);
1196 qc->qc_flags = be32_to_cpu(str->qc_flags);
1197 qc->qc_id = be32_to_cpu(str->qc_id);
1198 }
1199
1200 int gfs2_quota_init(struct gfs2_sbd *sdp)
1201 {
1202 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1203 u64 size = i_size_read(sdp->sd_qc_inode);
1204 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1205 unsigned int x, slot = 0;
1206 unsigned int found = 0;
1207 u64 dblock;
1208 u32 extlen = 0;
1209 int error;
1210
1211 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1212 return -EIO;
1213
1214 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1215 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1216
1217 error = -ENOMEM;
1218
1219 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1220 sizeof(unsigned char *), GFP_NOFS);
1221 if (!sdp->sd_quota_bitmap)
1222 return error;
1223
1224 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1225 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1226 if (!sdp->sd_quota_bitmap[x])
1227 goto fail;
1228 }
1229
1230 for (x = 0; x < blocks; x++) {
1231 struct buffer_head *bh;
1232 unsigned int y;
1233
1234 if (!extlen) {
1235 int new = 0;
1236 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1237 if (error)
1238 goto fail;
1239 }
1240 error = -EIO;
1241 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1242 if (!bh)
1243 goto fail;
1244 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1245 brelse(bh);
1246 goto fail;
1247 }
1248
1249 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1250 y++, slot++) {
1251 struct gfs2_quota_change_host qc;
1252 struct gfs2_quota_data *qd;
1253
1254 gfs2_quota_change_in(&qc, bh->b_data +
1255 sizeof(struct gfs2_meta_header) +
1256 y * sizeof(struct gfs2_quota_change));
1257 if (!qc.qc_change)
1258 continue;
1259
1260 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1261 qc.qc_id, &qd);
1262 if (error) {
1263 brelse(bh);
1264 goto fail;
1265 }
1266
1267 set_bit(QDF_CHANGE, &qd->qd_flags);
1268 qd->qd_change = qc.qc_change;
1269 qd->qd_slot = slot;
1270 qd->qd_slot_count = 1;
1271
1272 spin_lock(&qd_lru_lock);
1273 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1274 list_add(&qd->qd_list, &sdp->sd_quota_list);
1275 atomic_inc(&sdp->sd_quota_count);
1276 spin_unlock(&qd_lru_lock);
1277
1278 found++;
1279 }
1280
1281 brelse(bh);
1282 dblock++;
1283 extlen--;
1284 }
1285
1286 if (found)
1287 fs_info(sdp, "found %u quota changes\n", found);
1288
1289 return 0;
1290
1291 fail:
1292 gfs2_quota_cleanup(sdp);
1293 return error;
1294 }
1295
1296 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1297 {
1298 struct list_head *head = &sdp->sd_quota_list;
1299 struct gfs2_quota_data *qd;
1300 unsigned int x;
1301
1302 spin_lock(&qd_lru_lock);
1303 while (!list_empty(head)) {
1304 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1305
1306 if (atomic_read(&qd->qd_count) > 1 ||
1307 (atomic_read(&qd->qd_count) &&
1308 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1309 list_move(&qd->qd_list, head);
1310 spin_unlock(&qd_lru_lock);
1311 schedule();
1312 spin_lock(&qd_lru_lock);
1313 continue;
1314 }
1315
1316 list_del(&qd->qd_list);
1317 /* Also remove if this qd exists in the reclaim list */
1318 if (!list_empty(&qd->qd_reclaim)) {
1319 list_del_init(&qd->qd_reclaim);
1320 atomic_dec(&qd_lru_count);
1321 }
1322 atomic_dec(&sdp->sd_quota_count);
1323 spin_unlock(&qd_lru_lock);
1324
1325 if (!atomic_read(&qd->qd_count)) {
1326 gfs2_assert_warn(sdp, !qd->qd_change);
1327 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1328 } else
1329 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1330 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1331
1332 gfs2_glock_put(qd->qd_gl);
1333 kmem_cache_free(gfs2_quotad_cachep, qd);
1334
1335 spin_lock(&qd_lru_lock);
1336 }
1337 spin_unlock(&qd_lru_lock);
1338
1339 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1340
1341 if (sdp->sd_quota_bitmap) {
1342 for (x = 0; x < sdp->sd_quota_chunks; x++)
1343 kfree(sdp->sd_quota_bitmap[x]);
1344 kfree(sdp->sd_quota_bitmap);
1345 }
1346 }
1347
1348 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1349 {
1350 if (error == 0 || error == -EROFS)
1351 return;
1352 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1353 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1354 }
1355
1356 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1357 int (*fxn)(struct super_block *sb, int type),
1358 unsigned long t, unsigned long *timeo,
1359 unsigned int *new_timeo)
1360 {
1361 if (t >= *timeo) {
1362 int error = fxn(sdp->sd_vfs, 0);
1363 quotad_error(sdp, msg, error);
1364 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1365 } else {
1366 *timeo -= t;
1367 }
1368 }
1369
1370 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1371 {
1372 struct gfs2_inode *ip;
1373
1374 while(1) {
1375 ip = NULL;
1376 spin_lock(&sdp->sd_trunc_lock);
1377 if (!list_empty(&sdp->sd_trunc_list)) {
1378 ip = list_entry(sdp->sd_trunc_list.next,
1379 struct gfs2_inode, i_trunc_list);
1380 list_del_init(&ip->i_trunc_list);
1381 }
1382 spin_unlock(&sdp->sd_trunc_lock);
1383 if (ip == NULL)
1384 return;
1385 gfs2_glock_finish_truncate(ip);
1386 }
1387 }
1388
1389 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1390 if (!sdp->sd_statfs_force_sync) {
1391 sdp->sd_statfs_force_sync = 1;
1392 wake_up(&sdp->sd_quota_wait);
1393 }
1394 }
1395
1396
1397 /**
1398 * gfs2_quotad - Write cached quota changes into the quota file
1399 * @sdp: Pointer to GFS2 superblock
1400 *
1401 */
1402
1403 int gfs2_quotad(void *data)
1404 {
1405 struct gfs2_sbd *sdp = data;
1406 struct gfs2_tune *tune = &sdp->sd_tune;
1407 unsigned long statfs_timeo = 0;
1408 unsigned long quotad_timeo = 0;
1409 unsigned long t = 0;
1410 DEFINE_WAIT(wait);
1411 int empty;
1412
1413 while (!kthread_should_stop()) {
1414
1415 /* Update the master statfs file */
1416 if (sdp->sd_statfs_force_sync) {
1417 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1418 quotad_error(sdp, "statfs", error);
1419 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1420 }
1421 else
1422 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1423 &statfs_timeo,
1424 &tune->gt_statfs_quantum);
1425
1426 /* Update quota file */
1427 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1428 &quotad_timeo, &tune->gt_quota_quantum);
1429
1430 /* Check for & recover partially truncated inodes */
1431 quotad_check_trunc_list(sdp);
1432
1433 try_to_freeze();
1434
1435 t = min(quotad_timeo, statfs_timeo);
1436
1437 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1438 spin_lock(&sdp->sd_trunc_lock);
1439 empty = list_empty(&sdp->sd_trunc_list);
1440 spin_unlock(&sdp->sd_trunc_lock);
1441 if (empty && !sdp->sd_statfs_force_sync)
1442 t -= schedule_timeout(t);
1443 else
1444 t = 0;
1445 finish_wait(&sdp->sd_quota_wait, &wait);
1446 }
1447
1448 return 0;
1449 }
1450
1451 static int gfs2_quota_get_xstate(struct super_block *sb,
1452 struct fs_quota_stat *fqs)
1453 {
1454 struct gfs2_sbd *sdp = sb->s_fs_info;
1455
1456 memset(fqs, 0, sizeof(struct fs_quota_stat));
1457 fqs->qs_version = FS_QSTAT_VERSION;
1458
1459 switch (sdp->sd_args.ar_quota) {
1460 case GFS2_QUOTA_ON:
1461 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1462 /*FALLTHRU*/
1463 case GFS2_QUOTA_ACCOUNT:
1464 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1465 break;
1466 case GFS2_QUOTA_OFF:
1467 break;
1468 }
1469
1470 if (sdp->sd_quota_inode) {
1471 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1472 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1473 }
1474 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1475 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1476 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1477 return 0;
1478 }
1479
1480 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1481 struct fs_disk_quota *fdq)
1482 {
1483 struct gfs2_sbd *sdp = sb->s_fs_info;
1484 struct gfs2_quota_lvb *qlvb;
1485 struct gfs2_quota_data *qd;
1486 struct gfs2_holder q_gh;
1487 int error;
1488 int type;
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 (qid.type == USRQUOTA)
1496 type = QUOTA_USER;
1497 else if (qid.type == GRPQUOTA)
1498 type = QUOTA_GROUP;
1499 else
1500 return -EINVAL;
1501
1502 error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &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_lksb.sb_lvbptr;
1510 fdq->d_version = FS_DQUOT_VERSION;
1511 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1512 fdq->d_id = from_kqid(&init_user_ns, qid);
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, struct kqid qid,
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 loff_t offset;
1537 int error;
1538 int type;
1539
1540 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1541 return -ESRCH; /* Crazy XFS error code */
1542
1543 switch(qid.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 != from_kqid(&init_user_ns, qid))
1561 return -EINVAL;
1562
1563 error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
1564 if (error)
1565 return error;
1566
1567 error = gfs2_rs_alloc(ip);
1568 if (error)
1569 goto out_put;
1570
1571 mutex_lock(&ip->i_inode.i_mutex);
1572 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1573 if (error)
1574 goto out_unlockput;
1575 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1576 if (error)
1577 goto out_q;
1578
1579 /* Check for existing entry, if none then alloc new blocks */
1580 error = update_qd(sdp, qd);
1581 if (error)
1582 goto out_i;
1583
1584 /* If nothing has changed, this is a no-op */
1585 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1586 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1587 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1588
1589 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1590 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1591 fdq->d_fieldmask ^= FS_DQ_BHARD;
1592
1593 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1594 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1595 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1596
1597 if (fdq->d_fieldmask == 0)
1598 goto out_i;
1599
1600 offset = qd2offset(qd);
1601 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1602 if (gfs2_is_stuffed(ip))
1603 alloc_required = 1;
1604 if (alloc_required) {
1605 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1606 &data_blocks, &ind_blocks);
1607 blocks = 1 + data_blocks + ind_blocks;
1608 error = gfs2_inplace_reserve(ip, blocks, 0);
1609 if (error)
1610 goto out_i;
1611 blocks += gfs2_rg_blocks(ip, blocks);
1612 }
1613
1614 /* Some quotas span block boundaries and can update two blocks,
1615 adding an extra block to the transaction to handle such quotas */
1616 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1617 if (error)
1618 goto out_release;
1619
1620 /* Apply changes */
1621 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1622
1623 gfs2_trans_end(sdp);
1624 out_release:
1625 if (alloc_required)
1626 gfs2_inplace_release(ip);
1627 out_i:
1628 gfs2_glock_dq_uninit(&i_gh);
1629 out_q:
1630 gfs2_glock_dq_uninit(&q_gh);
1631 out_unlockput:
1632 mutex_unlock(&ip->i_inode.i_mutex);
1633 out_put:
1634 qd_put(qd);
1635 return error;
1636 }
1637
1638 const struct quotactl_ops gfs2_quotactl_ops = {
1639 .quota_sync = gfs2_quota_sync,
1640 .get_xstate = gfs2_quota_get_xstate,
1641 .get_dqblk = gfs2_get_dqblk,
1642 .set_dqblk = gfs2_set_dqblk,
1643 };
CRIS linux kernel tree