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Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / fs / gfs2 / quota.c
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 gfs2_rs_alloc(ip);
502
503 qd = ip->i_res->rs_qa_qd;
504
505 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
506 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
507 return -EIO;
508
509 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
510 return 0;
511
512 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
513 if (error)
514 goto out;
515 ip->i_res->rs_qa_qd_num++;
516 qd++;
517
518 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
519 if (error)
520 goto out;
521 ip->i_res->rs_qa_qd_num++;
522 qd++;
523
524 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
525 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
526 if (error)
527 goto out;
528 ip->i_res->rs_qa_qd_num++;
529 qd++;
530 }
531
532 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
533 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
534 if (error)
535 goto out;
536 ip->i_res->rs_qa_qd_num++;
537 qd++;
538 }
539
540 out:
541 if (error)
542 gfs2_quota_unhold(ip);
543 return error;
544 }
545
546 void gfs2_quota_unhold(struct gfs2_inode *ip)
547 {
548 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
549 unsigned int x;
550
551 if (ip->i_res == NULL)
552 return;
553 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
554
555 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
556 qdsb_put(ip->i_res->rs_qa_qd[x]);
557 ip->i_res->rs_qa_qd[x] = NULL;
558 }
559 ip->i_res->rs_qa_qd_num = 0;
560 }
561
562 static int sort_qd(const void *a, const void *b)
563 {
564 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
565 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
566
567 if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
568 !test_bit(QDF_USER, &qd_b->qd_flags)) {
569 if (test_bit(QDF_USER, &qd_a->qd_flags))
570 return -1;
571 else
572 return 1;
573 }
574 if (qd_a->qd_id < qd_b->qd_id)
575 return -1;
576 if (qd_a->qd_id > qd_b->qd_id)
577 return 1;
578
579 return 0;
580 }
581
582 static void do_qc(struct gfs2_quota_data *qd, s64 change)
583 {
584 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
585 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
586 struct gfs2_quota_change *qc = qd->qd_bh_qc;
587 s64 x;
588
589 mutex_lock(&sdp->sd_quota_mutex);
590 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
591
592 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
593 qc->qc_change = 0;
594 qc->qc_flags = 0;
595 if (test_bit(QDF_USER, &qd->qd_flags))
596 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
597 qc->qc_id = cpu_to_be32(qd->qd_id);
598 }
599
600 x = be64_to_cpu(qc->qc_change) + change;
601 qc->qc_change = cpu_to_be64(x);
602
603 spin_lock(&qd_lru_lock);
604 qd->qd_change = x;
605 spin_unlock(&qd_lru_lock);
606
607 if (!x) {
608 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
609 clear_bit(QDF_CHANGE, &qd->qd_flags);
610 qc->qc_flags = 0;
611 qc->qc_id = 0;
612 slot_put(qd);
613 qd_put(qd);
614 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
615 qd_hold(qd);
616 slot_hold(qd);
617 }
618
619 mutex_unlock(&sdp->sd_quota_mutex);
620 }
621
622 /**
623 * gfs2_adjust_quota - adjust record of current block usage
624 * @ip: The quota inode
625 * @loc: Offset of the entry in the quota file
626 * @change: The amount of usage change to record
627 * @qd: The quota data
628 * @fdq: The updated limits to record
629 *
630 * This function was mostly borrowed from gfs2_block_truncate_page which was
631 * in turn mostly borrowed from ext3
632 *
633 * Returns: 0 or -ve on error
634 */
635
636 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
637 s64 change, struct gfs2_quota_data *qd,
638 struct fs_disk_quota *fdq)
639 {
640 struct inode *inode = &ip->i_inode;
641 struct gfs2_sbd *sdp = GFS2_SB(inode);
642 struct address_space *mapping = inode->i_mapping;
643 unsigned long index = loc >> PAGE_CACHE_SHIFT;
644 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
645 unsigned blocksize, iblock, pos;
646 struct buffer_head *bh;
647 struct page *page;
648 void *kaddr, *ptr;
649 struct gfs2_quota q, *qp;
650 int err, nbytes;
651 u64 size;
652
653 if (gfs2_is_stuffed(ip)) {
654 err = gfs2_unstuff_dinode(ip, NULL);
655 if (err)
656 return err;
657 }
658
659 memset(&q, 0, sizeof(struct gfs2_quota));
660 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
661 if (err < 0)
662 return err;
663
664 err = -EIO;
665 qp = &q;
666 qp->qu_value = be64_to_cpu(qp->qu_value);
667 qp->qu_value += change;
668 qp->qu_value = cpu_to_be64(qp->qu_value);
669 qd->qd_qb.qb_value = qp->qu_value;
670 if (fdq) {
671 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
672 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
673 qd->qd_qb.qb_warn = qp->qu_warn;
674 }
675 if (fdq->d_fieldmask & FS_DQ_BHARD) {
676 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
677 qd->qd_qb.qb_limit = qp->qu_limit;
678 }
679 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
680 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
681 qd->qd_qb.qb_value = qp->qu_value;
682 }
683 }
684
685 /* Write the quota into the quota file on disk */
686 ptr = qp;
687 nbytes = sizeof(struct gfs2_quota);
688 get_a_page:
689 page = find_or_create_page(mapping, index, GFP_NOFS);
690 if (!page)
691 return -ENOMEM;
692
693 blocksize = inode->i_sb->s_blocksize;
694 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
695
696 if (!page_has_buffers(page))
697 create_empty_buffers(page, blocksize, 0);
698
699 bh = page_buffers(page);
700 pos = blocksize;
701 while (offset >= pos) {
702 bh = bh->b_this_page;
703 iblock++;
704 pos += blocksize;
705 }
706
707 if (!buffer_mapped(bh)) {
708 gfs2_block_map(inode, iblock, bh, 1);
709 if (!buffer_mapped(bh))
710 goto unlock_out;
711 /* If it's a newly allocated disk block for quota, zero it */
712 if (buffer_new(bh))
713 zero_user(page, pos - blocksize, bh->b_size);
714 }
715
716 if (PageUptodate(page))
717 set_buffer_uptodate(bh);
718
719 if (!buffer_uptodate(bh)) {
720 ll_rw_block(READ | REQ_META, 1, &bh);
721 wait_on_buffer(bh);
722 if (!buffer_uptodate(bh))
723 goto unlock_out;
724 }
725
726 gfs2_trans_add_bh(ip->i_gl, bh, 0);
727
728 kaddr = kmap_atomic(page);
729 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
730 nbytes = PAGE_CACHE_SIZE - offset;
731 memcpy(kaddr + offset, ptr, nbytes);
732 flush_dcache_page(page);
733 kunmap_atomic(kaddr);
734 unlock_page(page);
735 page_cache_release(page);
736
737 /* If quota straddles page boundary, we need to update the rest of the
738 * quota at the beginning of the next page */
739 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
740 ptr = ptr + nbytes;
741 nbytes = sizeof(struct gfs2_quota) - nbytes;
742 offset = 0;
743 index++;
744 goto get_a_page;
745 }
746
747 size = loc + sizeof(struct gfs2_quota);
748 if (size > inode->i_size)
749 i_size_write(inode, size);
750 inode->i_mtime = inode->i_atime = CURRENT_TIME;
751 mark_inode_dirty(inode);
752 return 0;
753
754 unlock_out:
755 unlock_page(page);
756 page_cache_release(page);
757 return err;
758 }
759
760 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
761 {
762 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
763 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
764 unsigned int data_blocks, ind_blocks;
765 struct gfs2_holder *ghs, i_gh;
766 unsigned int qx, x;
767 struct gfs2_quota_data *qd;
768 loff_t offset;
769 unsigned int nalloc = 0, blocks;
770 int error;
771
772 error = gfs2_rs_alloc(ip);
773 if (error)
774 return error;
775
776 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
777 &data_blocks, &ind_blocks);
778
779 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
780 if (!ghs)
781 return -ENOMEM;
782
783 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
784 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
785 for (qx = 0; qx < num_qd; qx++) {
786 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
787 GL_NOCACHE, &ghs[qx]);
788 if (error)
789 goto out;
790 }
791
792 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
793 if (error)
794 goto out;
795
796 for (x = 0; x < num_qd; x++) {
797 offset = qd2offset(qda[x]);
798 if (gfs2_write_alloc_required(ip, offset,
799 sizeof(struct gfs2_quota)))
800 nalloc++;
801 }
802
803 /*
804 * 1 blk for unstuffing inode if stuffed. We add this extra
805 * block to the reservation unconditionally. If the inode
806 * doesn't need unstuffing, the block will be released to the
807 * rgrp since it won't be allocated during the transaction
808 */
809 /* +3 in the end for unstuffing block, inode size update block
810 * and another block in case quota straddles page boundary and
811 * two blocks need to be updated instead of 1 */
812 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
813
814 error = gfs2_inplace_reserve(ip, 1 +
815 (nalloc * (data_blocks + ind_blocks)));
816 if (error)
817 goto out_alloc;
818
819 if (nalloc)
820 blocks += gfs2_rg_blocks(ip) + nalloc * ind_blocks + RES_STATFS;
821
822 error = gfs2_trans_begin(sdp, blocks, 0);
823 if (error)
824 goto out_ipres;
825
826 for (x = 0; x < num_qd; x++) {
827 qd = qda[x];
828 offset = qd2offset(qd);
829 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
830 if (error)
831 goto out_end_trans;
832
833 do_qc(qd, -qd->qd_change_sync);
834 set_bit(QDF_REFRESH, &qd->qd_flags);
835 }
836
837 error = 0;
838
839 out_end_trans:
840 gfs2_trans_end(sdp);
841 out_ipres:
842 gfs2_inplace_release(ip);
843 out_alloc:
844 gfs2_glock_dq_uninit(&i_gh);
845 out:
846 while (qx--)
847 gfs2_glock_dq_uninit(&ghs[qx]);
848 mutex_unlock(&ip->i_inode.i_mutex);
849 kfree(ghs);
850 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
851 return error;
852 }
853
854 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
855 {
856 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
857 struct gfs2_quota q;
858 struct gfs2_quota_lvb *qlvb;
859 loff_t pos;
860 int error;
861
862 memset(&q, 0, sizeof(struct gfs2_quota));
863 pos = qd2offset(qd);
864 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
865 if (error < 0)
866 return error;
867
868 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
869 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
870 qlvb->__pad = 0;
871 qlvb->qb_limit = q.qu_limit;
872 qlvb->qb_warn = q.qu_warn;
873 qlvb->qb_value = q.qu_value;
874 qd->qd_qb = *qlvb;
875
876 return 0;
877 }
878
879 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
880 struct gfs2_holder *q_gh)
881 {
882 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
883 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
884 struct gfs2_holder i_gh;
885 int error;
886
887 restart:
888 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
889 if (error)
890 return error;
891
892 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
893
894 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
895 gfs2_glock_dq_uninit(q_gh);
896 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
897 GL_NOCACHE, q_gh);
898 if (error)
899 return error;
900
901 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
902 if (error)
903 goto fail;
904
905 error = update_qd(sdp, qd);
906 if (error)
907 goto fail_gunlock;
908
909 gfs2_glock_dq_uninit(&i_gh);
910 gfs2_glock_dq_uninit(q_gh);
911 force_refresh = 0;
912 goto restart;
913 }
914
915 return 0;
916
917 fail_gunlock:
918 gfs2_glock_dq_uninit(&i_gh);
919 fail:
920 gfs2_glock_dq_uninit(q_gh);
921 return error;
922 }
923
924 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
925 {
926 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
927 struct gfs2_quota_data *qd;
928 unsigned int x;
929 int error = 0;
930
931 error = gfs2_quota_hold(ip, uid, gid);
932 if (error)
933 return error;
934
935 if (capable(CAP_SYS_RESOURCE) ||
936 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
937 return 0;
938
939 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
940 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
941
942 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
943 int force = NO_FORCE;
944 qd = ip->i_res->rs_qa_qd[x];
945 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
946 force = FORCE;
947 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
948 if (error)
949 break;
950 }
951
952 if (!error)
953 set_bit(GIF_QD_LOCKED, &ip->i_flags);
954 else {
955 while (x--)
956 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
957 gfs2_quota_unhold(ip);
958 }
959
960 return error;
961 }
962
963 static int need_sync(struct gfs2_quota_data *qd)
964 {
965 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
966 struct gfs2_tune *gt = &sdp->sd_tune;
967 s64 value;
968 unsigned int num, den;
969 int do_sync = 1;
970
971 if (!qd->qd_qb.qb_limit)
972 return 0;
973
974 spin_lock(&qd_lru_lock);
975 value = qd->qd_change;
976 spin_unlock(&qd_lru_lock);
977
978 spin_lock(&gt->gt_spin);
979 num = gt->gt_quota_scale_num;
980 den = gt->gt_quota_scale_den;
981 spin_unlock(&gt->gt_spin);
982
983 if (value < 0)
984 do_sync = 0;
985 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
986 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
987 do_sync = 0;
988 else {
989 value *= gfs2_jindex_size(sdp) * num;
990 value = div_s64(value, den);
991 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
992 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
993 do_sync = 0;
994 }
995
996 return do_sync;
997 }
998
999 void gfs2_quota_unlock(struct gfs2_inode *ip)
1000 {
1001 struct gfs2_quota_data *qda[4];
1002 unsigned int count = 0;
1003 unsigned int x;
1004
1005 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1006 goto out;
1007
1008 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1009 struct gfs2_quota_data *qd;
1010 int sync;
1011
1012 qd = ip->i_res->rs_qa_qd[x];
1013 sync = need_sync(qd);
1014
1015 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1016
1017 if (sync && qd_trylock(qd))
1018 qda[count++] = qd;
1019 }
1020
1021 if (count) {
1022 do_sync(count, qda);
1023 for (x = 0; x < count; x++)
1024 qd_unlock(qda[x]);
1025 }
1026
1027 out:
1028 gfs2_quota_unhold(ip);
1029 }
1030
1031 #define MAX_LINE 256
1032
1033 static int print_message(struct gfs2_quota_data *qd, char *type)
1034 {
1035 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1036
1037 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1038 sdp->sd_fsname, type,
1039 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1040 qd->qd_id);
1041
1042 return 0;
1043 }
1044
1045 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1046 {
1047 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1048 struct gfs2_quota_data *qd;
1049 s64 value;
1050 unsigned int x;
1051 int error = 0;
1052
1053 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1054 return 0;
1055
1056 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1057 return 0;
1058
1059 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1060 qd = ip->i_res->rs_qa_qd[x];
1061
1062 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1063 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1064 continue;
1065
1066 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1067 spin_lock(&qd_lru_lock);
1068 value += qd->qd_change;
1069 spin_unlock(&qd_lru_lock);
1070
1071 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1072 print_message(qd, "exceeded");
1073 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1074 USRQUOTA : GRPQUOTA, qd->qd_id,
1075 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1076
1077 error = -EDQUOT;
1078 break;
1079 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1080 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1081 time_after_eq(jiffies, qd->qd_last_warn +
1082 gfs2_tune_get(sdp,
1083 gt_quota_warn_period) * HZ)) {
1084 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1085 USRQUOTA : GRPQUOTA, qd->qd_id,
1086 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1087 error = print_message(qd, "warning");
1088 qd->qd_last_warn = jiffies;
1089 }
1090 }
1091
1092 return error;
1093 }
1094
1095 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1096 u32 uid, u32 gid)
1097 {
1098 struct gfs2_quota_data *qd;
1099 unsigned int x;
1100
1101 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1102 return;
1103 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1104 return;
1105
1106 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1107 qd = ip->i_res->rs_qa_qd[x];
1108
1109 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1110 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1111 do_qc(qd, change);
1112 }
1113 }
1114 }
1115
1116 int gfs2_quota_sync(struct super_block *sb, int type)
1117 {
1118 struct gfs2_sbd *sdp = sb->s_fs_info;
1119 struct gfs2_quota_data **qda;
1120 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1121 unsigned int num_qd;
1122 unsigned int x;
1123 int error = 0;
1124
1125 sdp->sd_quota_sync_gen++;
1126
1127 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1128 if (!qda)
1129 return -ENOMEM;
1130
1131 do {
1132 num_qd = 0;
1133
1134 for (;;) {
1135 error = qd_fish(sdp, qda + num_qd);
1136 if (error || !qda[num_qd])
1137 break;
1138 if (++num_qd == max_qd)
1139 break;
1140 }
1141
1142 if (num_qd) {
1143 if (!error)
1144 error = do_sync(num_qd, qda);
1145 if (!error)
1146 for (x = 0; x < num_qd; x++)
1147 qda[x]->qd_sync_gen =
1148 sdp->sd_quota_sync_gen;
1149
1150 for (x = 0; x < num_qd; x++)
1151 qd_unlock(qda[x]);
1152 }
1153 } while (!error && num_qd == max_qd);
1154
1155 kfree(qda);
1156
1157 return error;
1158 }
1159
1160 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1161 {
1162 return gfs2_quota_sync(sb, type);
1163 }
1164
1165 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1166 {
1167 struct gfs2_quota_data *qd;
1168 struct gfs2_holder q_gh;
1169 int error;
1170
1171 error = qd_get(sdp, user, id, &qd);
1172 if (error)
1173 return error;
1174
1175 error = do_glock(qd, FORCE, &q_gh);
1176 if (!error)
1177 gfs2_glock_dq_uninit(&q_gh);
1178
1179 qd_put(qd);
1180 return error;
1181 }
1182
1183 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1184 {
1185 const struct gfs2_quota_change *str = buf;
1186
1187 qc->qc_change = be64_to_cpu(str->qc_change);
1188 qc->qc_flags = be32_to_cpu(str->qc_flags);
1189 qc->qc_id = be32_to_cpu(str->qc_id);
1190 }
1191
1192 int gfs2_quota_init(struct gfs2_sbd *sdp)
1193 {
1194 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1195 u64 size = i_size_read(sdp->sd_qc_inode);
1196 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1197 unsigned int x, slot = 0;
1198 unsigned int found = 0;
1199 u64 dblock;
1200 u32 extlen = 0;
1201 int error;
1202
1203 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1204 return -EIO;
1205
1206 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1207 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1208
1209 error = -ENOMEM;
1210
1211 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1212 sizeof(unsigned char *), GFP_NOFS);
1213 if (!sdp->sd_quota_bitmap)
1214 return error;
1215
1216 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1217 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1218 if (!sdp->sd_quota_bitmap[x])
1219 goto fail;
1220 }
1221
1222 for (x = 0; x < blocks; x++) {
1223 struct buffer_head *bh;
1224 unsigned int y;
1225
1226 if (!extlen) {
1227 int new = 0;
1228 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1229 if (error)
1230 goto fail;
1231 }
1232 error = -EIO;
1233 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1234 if (!bh)
1235 goto fail;
1236 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1237 brelse(bh);
1238 goto fail;
1239 }
1240
1241 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1242 y++, slot++) {
1243 struct gfs2_quota_change_host qc;
1244 struct gfs2_quota_data *qd;
1245
1246 gfs2_quota_change_in(&qc, bh->b_data +
1247 sizeof(struct gfs2_meta_header) +
1248 y * sizeof(struct gfs2_quota_change));
1249 if (!qc.qc_change)
1250 continue;
1251
1252 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1253 qc.qc_id, &qd);
1254 if (error) {
1255 brelse(bh);
1256 goto fail;
1257 }
1258
1259 set_bit(QDF_CHANGE, &qd->qd_flags);
1260 qd->qd_change = qc.qc_change;
1261 qd->qd_slot = slot;
1262 qd->qd_slot_count = 1;
1263
1264 spin_lock(&qd_lru_lock);
1265 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1266 list_add(&qd->qd_list, &sdp->sd_quota_list);
1267 atomic_inc(&sdp->sd_quota_count);
1268 spin_unlock(&qd_lru_lock);
1269
1270 found++;
1271 }
1272
1273 brelse(bh);
1274 dblock++;
1275 extlen--;
1276 }
1277
1278 if (found)
1279 fs_info(sdp, "found %u quota changes\n", found);
1280
1281 return 0;
1282
1283 fail:
1284 gfs2_quota_cleanup(sdp);
1285 return error;
1286 }
1287
1288 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1289 {
1290 struct list_head *head = &sdp->sd_quota_list;
1291 struct gfs2_quota_data *qd;
1292 unsigned int x;
1293
1294 spin_lock(&qd_lru_lock);
1295 while (!list_empty(head)) {
1296 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1297
1298 if (atomic_read(&qd->qd_count) > 1 ||
1299 (atomic_read(&qd->qd_count) &&
1300 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1301 list_move(&qd->qd_list, head);
1302 spin_unlock(&qd_lru_lock);
1303 schedule();
1304 spin_lock(&qd_lru_lock);
1305 continue;
1306 }
1307
1308 list_del(&qd->qd_list);
1309 /* Also remove if this qd exists in the reclaim list */
1310 if (!list_empty(&qd->qd_reclaim)) {
1311 list_del_init(&qd->qd_reclaim);
1312 atomic_dec(&qd_lru_count);
1313 }
1314 atomic_dec(&sdp->sd_quota_count);
1315 spin_unlock(&qd_lru_lock);
1316
1317 if (!atomic_read(&qd->qd_count)) {
1318 gfs2_assert_warn(sdp, !qd->qd_change);
1319 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1320 } else
1321 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1322 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1323
1324 gfs2_glock_put(qd->qd_gl);
1325 kmem_cache_free(gfs2_quotad_cachep, qd);
1326
1327 spin_lock(&qd_lru_lock);
1328 }
1329 spin_unlock(&qd_lru_lock);
1330
1331 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1332
1333 if (sdp->sd_quota_bitmap) {
1334 for (x = 0; x < sdp->sd_quota_chunks; x++)
1335 kfree(sdp->sd_quota_bitmap[x]);
1336 kfree(sdp->sd_quota_bitmap);
1337 }
1338 }
1339
1340 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1341 {
1342 if (error == 0 || error == -EROFS)
1343 return;
1344 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1345 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1346 }
1347
1348 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1349 int (*fxn)(struct super_block *sb, int type),
1350 unsigned long t, unsigned long *timeo,
1351 unsigned int *new_timeo)
1352 {
1353 if (t >= *timeo) {
1354 int error = fxn(sdp->sd_vfs, 0);
1355 quotad_error(sdp, msg, error);
1356 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1357 } else {
1358 *timeo -= t;
1359 }
1360 }
1361
1362 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1363 {
1364 struct gfs2_inode *ip;
1365
1366 while(1) {
1367 ip = NULL;
1368 spin_lock(&sdp->sd_trunc_lock);
1369 if (!list_empty(&sdp->sd_trunc_list)) {
1370 ip = list_entry(sdp->sd_trunc_list.next,
1371 struct gfs2_inode, i_trunc_list);
1372 list_del_init(&ip->i_trunc_list);
1373 }
1374 spin_unlock(&sdp->sd_trunc_lock);
1375 if (ip == NULL)
1376 return;
1377 gfs2_glock_finish_truncate(ip);
1378 }
1379 }
1380
1381 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1382 if (!sdp->sd_statfs_force_sync) {
1383 sdp->sd_statfs_force_sync = 1;
1384 wake_up(&sdp->sd_quota_wait);
1385 }
1386 }
1387
1388
1389 /**
1390 * gfs2_quotad - Write cached quota changes into the quota file
1391 * @sdp: Pointer to GFS2 superblock
1392 *
1393 */
1394
1395 int gfs2_quotad(void *data)
1396 {
1397 struct gfs2_sbd *sdp = data;
1398 struct gfs2_tune *tune = &sdp->sd_tune;
1399 unsigned long statfs_timeo = 0;
1400 unsigned long quotad_timeo = 0;
1401 unsigned long t = 0;
1402 DEFINE_WAIT(wait);
1403 int empty;
1404
1405 while (!kthread_should_stop()) {
1406
1407 /* Update the master statfs file */
1408 if (sdp->sd_statfs_force_sync) {
1409 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1410 quotad_error(sdp, "statfs", error);
1411 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1412 }
1413 else
1414 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1415 &statfs_timeo,
1416 &tune->gt_statfs_quantum);
1417
1418 /* Update quota file */
1419 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1420 &quotad_timeo, &tune->gt_quota_quantum);
1421
1422 /* Check for & recover partially truncated inodes */
1423 quotad_check_trunc_list(sdp);
1424
1425 try_to_freeze();
1426
1427 t = min(quotad_timeo, statfs_timeo);
1428
1429 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1430 spin_lock(&sdp->sd_trunc_lock);
1431 empty = list_empty(&sdp->sd_trunc_list);
1432 spin_unlock(&sdp->sd_trunc_lock);
1433 if (empty && !sdp->sd_statfs_force_sync)
1434 t -= schedule_timeout(t);
1435 else
1436 t = 0;
1437 finish_wait(&sdp->sd_quota_wait, &wait);
1438 }
1439
1440 return 0;
1441 }
1442
1443 static int gfs2_quota_get_xstate(struct super_block *sb,
1444 struct fs_quota_stat *fqs)
1445 {
1446 struct gfs2_sbd *sdp = sb->s_fs_info;
1447
1448 memset(fqs, 0, sizeof(struct fs_quota_stat));
1449 fqs->qs_version = FS_QSTAT_VERSION;
1450
1451 switch (sdp->sd_args.ar_quota) {
1452 case GFS2_QUOTA_ON:
1453 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1454 /*FALLTHRU*/
1455 case GFS2_QUOTA_ACCOUNT:
1456 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1457 break;
1458 case GFS2_QUOTA_OFF:
1459 break;
1460 }
1461
1462 if (sdp->sd_quota_inode) {
1463 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1464 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1465 }
1466 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1467 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1468 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1469 return 0;
1470 }
1471
1472 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1473 struct fs_disk_quota *fdq)
1474 {
1475 struct gfs2_sbd *sdp = sb->s_fs_info;
1476 struct gfs2_quota_lvb *qlvb;
1477 struct gfs2_quota_data *qd;
1478 struct gfs2_holder q_gh;
1479 int error;
1480
1481 memset(fdq, 0, sizeof(struct fs_disk_quota));
1482
1483 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1484 return -ESRCH; /* Crazy XFS error code */
1485
1486 if (type == USRQUOTA)
1487 type = QUOTA_USER;
1488 else if (type == GRPQUOTA)
1489 type = QUOTA_GROUP;
1490 else
1491 return -EINVAL;
1492
1493 error = qd_get(sdp, type, id, &qd);
1494 if (error)
1495 return error;
1496 error = do_glock(qd, FORCE, &q_gh);
1497 if (error)
1498 goto out;
1499
1500 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1501 fdq->d_version = FS_DQUOT_VERSION;
1502 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1503 fdq->d_id = id;
1504 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1505 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1506 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1507
1508 gfs2_glock_dq_uninit(&q_gh);
1509 out:
1510 qd_put(qd);
1511 return error;
1512 }
1513
1514 /* GFS2 only supports a subset of the XFS fields */
1515 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1516
1517 static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id,
1518 struct fs_disk_quota *fdq)
1519 {
1520 struct gfs2_sbd *sdp = sb->s_fs_info;
1521 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1522 struct gfs2_quota_data *qd;
1523 struct gfs2_holder q_gh, i_gh;
1524 unsigned int data_blocks, ind_blocks;
1525 unsigned int blocks = 0;
1526 int alloc_required;
1527 loff_t offset;
1528 int error;
1529
1530 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1531 return -ESRCH; /* Crazy XFS error code */
1532
1533 switch(type) {
1534 case USRQUOTA:
1535 type = QUOTA_USER;
1536 if (fdq->d_flags != FS_USER_QUOTA)
1537 return -EINVAL;
1538 break;
1539 case GRPQUOTA:
1540 type = QUOTA_GROUP;
1541 if (fdq->d_flags != FS_GROUP_QUOTA)
1542 return -EINVAL;
1543 break;
1544 default:
1545 return -EINVAL;
1546 }
1547
1548 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1549 return -EINVAL;
1550 if (fdq->d_id != id)
1551 return -EINVAL;
1552
1553 error = qd_get(sdp, type, id, &qd);
1554 if (error)
1555 return error;
1556
1557 error = gfs2_rs_alloc(ip);
1558 if (error)
1559 goto out_put;
1560
1561 mutex_lock(&ip->i_inode.i_mutex);
1562 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1563 if (error)
1564 goto out_unlockput;
1565 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1566 if (error)
1567 goto out_q;
1568
1569 /* Check for existing entry, if none then alloc new blocks */
1570 error = update_qd(sdp, qd);
1571 if (error)
1572 goto out_i;
1573
1574 /* If nothing has changed, this is a no-op */
1575 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1576 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1577 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1578
1579 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1580 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1581 fdq->d_fieldmask ^= FS_DQ_BHARD;
1582
1583 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1584 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1585 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1586
1587 if (fdq->d_fieldmask == 0)
1588 goto out_i;
1589
1590 offset = qd2offset(qd);
1591 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1592 if (gfs2_is_stuffed(ip))
1593 alloc_required = 1;
1594 if (alloc_required) {
1595 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1596 &data_blocks, &ind_blocks);
1597 blocks = 1 + data_blocks + ind_blocks;
1598 error = gfs2_inplace_reserve(ip, blocks);
1599 if (error)
1600 goto out_i;
1601 blocks += gfs2_rg_blocks(ip);
1602 }
1603
1604 /* Some quotas span block boundaries and can update two blocks,
1605 adding an extra block to the transaction to handle such quotas */
1606 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1607 if (error)
1608 goto out_release;
1609
1610 /* Apply changes */
1611 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1612
1613 gfs2_trans_end(sdp);
1614 out_release:
1615 if (alloc_required)
1616 gfs2_inplace_release(ip);
1617 out_i:
1618 gfs2_glock_dq_uninit(&i_gh);
1619 out_q:
1620 gfs2_glock_dq_uninit(&q_gh);
1621 out_unlockput:
1622 mutex_unlock(&ip->i_inode.i_mutex);
1623 out_put:
1624 qd_put(qd);
1625 return error;
1626 }
1627
1628 const struct quotactl_ops gfs2_quotactl_ops = {
1629 .quota_sync = gfs2_quota_sync,
1630 .get_xstate = gfs2_quota_get_xstate,
1631 .get_dqblk = gfs2_get_dqblk,
1632 .set_dqblk = gfs2_set_dqblk,
1633 };
Linux kernel - Deliverables
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