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ARM: 7447/1: rwlocks: remove unused branch labels from trylock routines
[linux-2.6/libata-dev.git] / fs / gfs2 / quota.c
blobb97178e7d397d3e767694622779ace8716c4d6f3
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_qadata *qa = ip->i_qadata;
498 struct gfs2_quota_data **qd = qa->qa_qd;
499 int error;
500
501 if (gfs2_assert_warn(sdp, !qa->qa_qd_num) ||
502 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
503 return -EIO;
504
505 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
506 return 0;
507
508 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
509 if (error)
510 goto out;
511 qa->qa_qd_num++;
512 qd++;
513
514 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
515 if (error)
516 goto out;
517 qa->qa_qd_num++;
518 qd++;
519
520 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
521 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
522 if (error)
523 goto out;
524 qa->qa_qd_num++;
525 qd++;
526 }
527
528 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
529 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
530 if (error)
531 goto out;
532 qa->qa_qd_num++;
533 qd++;
534 }
535
536 out:
537 if (error)
538 gfs2_quota_unhold(ip);
539 return error;
540 }
541
542 void gfs2_quota_unhold(struct gfs2_inode *ip)
543 {
544 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
545 struct gfs2_qadata *qa = ip->i_qadata;
546 unsigned int x;
547
548 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
549
550 for (x = 0; x < qa->qa_qd_num; x++) {
551 qdsb_put(qa->qa_qd[x]);
552 qa->qa_qd[x] = NULL;
553 }
554 qa->qa_qd_num = 0;
555 }
556
557 static int sort_qd(const void *a, const void *b)
558 {
559 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
560 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
561
562 if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
563 !test_bit(QDF_USER, &qd_b->qd_flags)) {
564 if (test_bit(QDF_USER, &qd_a->qd_flags))
565 return -1;
566 else
567 return 1;
568 }
569 if (qd_a->qd_id < qd_b->qd_id)
570 return -1;
571 if (qd_a->qd_id > qd_b->qd_id)
572 return 1;
573
574 return 0;
575 }
576
577 static void do_qc(struct gfs2_quota_data *qd, s64 change)
578 {
579 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
580 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
581 struct gfs2_quota_change *qc = qd->qd_bh_qc;
582 s64 x;
583
584 mutex_lock(&sdp->sd_quota_mutex);
585 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
586
587 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
588 qc->qc_change = 0;
589 qc->qc_flags = 0;
590 if (test_bit(QDF_USER, &qd->qd_flags))
591 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
592 qc->qc_id = cpu_to_be32(qd->qd_id);
593 }
594
595 x = be64_to_cpu(qc->qc_change) + change;
596 qc->qc_change = cpu_to_be64(x);
597
598 spin_lock(&qd_lru_lock);
599 qd->qd_change = x;
600 spin_unlock(&qd_lru_lock);
601
602 if (!x) {
603 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
604 clear_bit(QDF_CHANGE, &qd->qd_flags);
605 qc->qc_flags = 0;
606 qc->qc_id = 0;
607 slot_put(qd);
608 qd_put(qd);
609 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
610 qd_hold(qd);
611 slot_hold(qd);
612 }
613
614 mutex_unlock(&sdp->sd_quota_mutex);
615 }
616
617 /**
618 * gfs2_adjust_quota - adjust record of current block usage
619 * @ip: The quota inode
620 * @loc: Offset of the entry in the quota file
621 * @change: The amount of usage change to record
622 * @qd: The quota data
623 * @fdq: The updated limits to record
624 *
625 * This function was mostly borrowed from gfs2_block_truncate_page which was
626 * in turn mostly borrowed from ext3
627 *
628 * Returns: 0 or -ve on error
629 */
630
631 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
632 s64 change, struct gfs2_quota_data *qd,
633 struct fs_disk_quota *fdq)
634 {
635 struct inode *inode = &ip->i_inode;
636 struct gfs2_sbd *sdp = GFS2_SB(inode);
637 struct address_space *mapping = inode->i_mapping;
638 unsigned long index = loc >> PAGE_CACHE_SHIFT;
639 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
640 unsigned blocksize, iblock, pos;
641 struct buffer_head *bh;
642 struct page *page;
643 void *kaddr, *ptr;
644 struct gfs2_quota q, *qp;
645 int err, nbytes;
646 u64 size;
647
648 if (gfs2_is_stuffed(ip)) {
649 err = gfs2_unstuff_dinode(ip, NULL);
650 if (err)
651 return err;
652 }
653
654 memset(&q, 0, sizeof(struct gfs2_quota));
655 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
656 if (err < 0)
657 return err;
658
659 err = -EIO;
660 qp = &q;
661 qp->qu_value = be64_to_cpu(qp->qu_value);
662 qp->qu_value += change;
663 qp->qu_value = cpu_to_be64(qp->qu_value);
664 qd->qd_qb.qb_value = qp->qu_value;
665 if (fdq) {
666 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
667 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
668 qd->qd_qb.qb_warn = qp->qu_warn;
669 }
670 if (fdq->d_fieldmask & FS_DQ_BHARD) {
671 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
672 qd->qd_qb.qb_limit = qp->qu_limit;
673 }
674 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
675 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
676 qd->qd_qb.qb_value = qp->qu_value;
677 }
678 }
679
680 /* Write the quota into the quota file on disk */
681 ptr = qp;
682 nbytes = sizeof(struct gfs2_quota);
683 get_a_page:
684 page = find_or_create_page(mapping, index, GFP_NOFS);
685 if (!page)
686 return -ENOMEM;
687
688 blocksize = inode->i_sb->s_blocksize;
689 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
690
691 if (!page_has_buffers(page))
692 create_empty_buffers(page, blocksize, 0);
693
694 bh = page_buffers(page);
695 pos = blocksize;
696 while (offset >= pos) {
697 bh = bh->b_this_page;
698 iblock++;
699 pos += blocksize;
700 }
701
702 if (!buffer_mapped(bh)) {
703 gfs2_block_map(inode, iblock, bh, 1);
704 if (!buffer_mapped(bh))
705 goto unlock_out;
706 /* If it's a newly allocated disk block for quota, zero it */
707 if (buffer_new(bh))
708 zero_user(page, pos - blocksize, bh->b_size);
709 }
710
711 if (PageUptodate(page))
712 set_buffer_uptodate(bh);
713
714 if (!buffer_uptodate(bh)) {
715 ll_rw_block(READ | REQ_META, 1, &bh);
716 wait_on_buffer(bh);
717 if (!buffer_uptodate(bh))
718 goto unlock_out;
719 }
720
721 gfs2_trans_add_bh(ip->i_gl, bh, 0);
722
723 kaddr = kmap_atomic(page);
724 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
725 nbytes = PAGE_CACHE_SIZE - offset;
726 memcpy(kaddr + offset, ptr, nbytes);
727 flush_dcache_page(page);
728 kunmap_atomic(kaddr);
729 unlock_page(page);
730 page_cache_release(page);
731
732 /* If quota straddles page boundary, we need to update the rest of the
733 * quota at the beginning of the next page */
734 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
735 ptr = ptr + nbytes;
736 nbytes = sizeof(struct gfs2_quota) - nbytes;
737 offset = 0;
738 index++;
739 goto get_a_page;
740 }
741
742 size = loc + sizeof(struct gfs2_quota);
743 if (size > inode->i_size)
744 i_size_write(inode, size);
745 inode->i_mtime = inode->i_atime = CURRENT_TIME;
746 mark_inode_dirty(inode);
747 return 0;
748
749 unlock_out:
750 unlock_page(page);
751 page_cache_release(page);
752 return err;
753 }
754
755 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
756 {
757 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
758 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
759 unsigned int data_blocks, ind_blocks;
760 struct gfs2_holder *ghs, i_gh;
761 unsigned int qx, x;
762 struct gfs2_quota_data *qd;
763 loff_t offset;
764 unsigned int nalloc = 0, blocks;
765 int error;
766
767 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
768 &data_blocks, &ind_blocks);
769
770 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
771 if (!ghs)
772 return -ENOMEM;
773
774 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
775 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
776 for (qx = 0; qx < num_qd; qx++) {
777 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
778 GL_NOCACHE, &ghs[qx]);
779 if (error)
780 goto out;
781 }
782
783 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
784 if (error)
785 goto out;
786
787 for (x = 0; x < num_qd; x++) {
788 offset = qd2offset(qda[x]);
789 if (gfs2_write_alloc_required(ip, offset,
790 sizeof(struct gfs2_quota)))
791 nalloc++;
792 }
793
794 /*
795 * 1 blk for unstuffing inode if stuffed. We add this extra
796 * block to the reservation unconditionally. If the inode
797 * doesn't need unstuffing, the block will be released to the
798 * rgrp since it won't be allocated during the transaction
799 */
800 /* +3 in the end for unstuffing block, inode size update block
801 * and another block in case quota straddles page boundary and
802 * two blocks need to be updated instead of 1 */
803 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
804
805 error = gfs2_inplace_reserve(ip, 1 +
806 (nalloc * (data_blocks + ind_blocks)));
807 if (error)
808 goto out_alloc;
809
810 if (nalloc)
811 blocks += gfs2_rg_blocks(ip) + nalloc * ind_blocks + RES_STATFS;
812
813 error = gfs2_trans_begin(sdp, blocks, 0);
814 if (error)
815 goto out_ipres;
816
817 for (x = 0; x < num_qd; x++) {
818 qd = qda[x];
819 offset = qd2offset(qd);
820 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
821 if (error)
822 goto out_end_trans;
823
824 do_qc(qd, -qd->qd_change_sync);
825 set_bit(QDF_REFRESH, &qd->qd_flags);
826 }
827
828 error = 0;
829
830 out_end_trans:
831 gfs2_trans_end(sdp);
832 out_ipres:
833 gfs2_inplace_release(ip);
834 out_alloc:
835 gfs2_glock_dq_uninit(&i_gh);
836 out:
837 while (qx--)
838 gfs2_glock_dq_uninit(&ghs[qx]);
839 mutex_unlock(&ip->i_inode.i_mutex);
840 kfree(ghs);
841 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
842 return error;
843 }
844
845 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
846 {
847 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
848 struct gfs2_quota q;
849 struct gfs2_quota_lvb *qlvb;
850 loff_t pos;
851 int error;
852
853 memset(&q, 0, sizeof(struct gfs2_quota));
854 pos = qd2offset(qd);
855 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
856 if (error < 0)
857 return error;
858
859 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
860 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
861 qlvb->__pad = 0;
862 qlvb->qb_limit = q.qu_limit;
863 qlvb->qb_warn = q.qu_warn;
864 qlvb->qb_value = q.qu_value;
865 qd->qd_qb = *qlvb;
866
867 return 0;
868 }
869
870 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
871 struct gfs2_holder *q_gh)
872 {
873 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
874 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
875 struct gfs2_holder i_gh;
876 int error;
877
878 restart:
879 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
880 if (error)
881 return error;
882
883 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
884
885 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
886 gfs2_glock_dq_uninit(q_gh);
887 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
888 GL_NOCACHE, q_gh);
889 if (error)
890 return error;
891
892 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
893 if (error)
894 goto fail;
895
896 error = update_qd(sdp, qd);
897 if (error)
898 goto fail_gunlock;
899
900 gfs2_glock_dq_uninit(&i_gh);
901 gfs2_glock_dq_uninit(q_gh);
902 force_refresh = 0;
903 goto restart;
904 }
905
906 return 0;
907
908 fail_gunlock:
909 gfs2_glock_dq_uninit(&i_gh);
910 fail:
911 gfs2_glock_dq_uninit(q_gh);
912 return error;
913 }
914
915 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
916 {
917 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
918 struct gfs2_qadata *qa = ip->i_qadata;
919 struct gfs2_quota_data *qd;
920 unsigned int x;
921 int error = 0;
922
923 error = gfs2_quota_hold(ip, uid, gid);
924 if (error)
925 return error;
926
927 if (capable(CAP_SYS_RESOURCE) ||
928 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
929 return 0;
930
931 sort(qa->qa_qd, qa->qa_qd_num, sizeof(struct gfs2_quota_data *),
932 sort_qd, NULL);
933
934 for (x = 0; x < qa->qa_qd_num; x++) {
935 int force = NO_FORCE;
936 qd = qa->qa_qd[x];
937 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
938 force = FORCE;
939 error = do_glock(qd, force, &qa->qa_qd_ghs[x]);
940 if (error)
941 break;
942 }
943
944 if (!error)
945 set_bit(GIF_QD_LOCKED, &ip->i_flags);
946 else {
947 while (x--)
948 gfs2_glock_dq_uninit(&qa->qa_qd_ghs[x]);
949 gfs2_quota_unhold(ip);
950 }
951
952 return error;
953 }
954
955 static int need_sync(struct gfs2_quota_data *qd)
956 {
957 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
958 struct gfs2_tune *gt = &sdp->sd_tune;
959 s64 value;
960 unsigned int num, den;
961 int do_sync = 1;
962
963 if (!qd->qd_qb.qb_limit)
964 return 0;
965
966 spin_lock(&qd_lru_lock);
967 value = qd->qd_change;
968 spin_unlock(&qd_lru_lock);
969
970 spin_lock(&gt->gt_spin);
971 num = gt->gt_quota_scale_num;
972 den = gt->gt_quota_scale_den;
973 spin_unlock(&gt->gt_spin);
974
975 if (value < 0)
976 do_sync = 0;
977 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
978 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
979 do_sync = 0;
980 else {
981 value *= gfs2_jindex_size(sdp) * num;
982 value = div_s64(value, den);
983 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
984 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
985 do_sync = 0;
986 }
987
988 return do_sync;
989 }
990
991 void gfs2_quota_unlock(struct gfs2_inode *ip)
992 {
993 struct gfs2_qadata *qa = ip->i_qadata;
994 struct gfs2_quota_data *qda[4];
995 unsigned int count = 0;
996 unsigned int x;
997
998 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
999 goto out;
1000
1001 for (x = 0; x < qa->qa_qd_num; x++) {
1002 struct gfs2_quota_data *qd;
1003 int sync;
1004
1005 qd = qa->qa_qd[x];
1006 sync = need_sync(qd);
1007
1008 gfs2_glock_dq_uninit(&qa->qa_qd_ghs[x]);
1009
1010 if (sync && qd_trylock(qd))
1011 qda[count++] = qd;
1012 }
1013
1014 if (count) {
1015 do_sync(count, qda);
1016 for (x = 0; x < count; x++)
1017 qd_unlock(qda[x]);
1018 }
1019
1020 out:
1021 gfs2_quota_unhold(ip);
1022 }
1023
1024 #define MAX_LINE 256
1025
1026 static int print_message(struct gfs2_quota_data *qd, char *type)
1027 {
1028 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1029
1030 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1031 sdp->sd_fsname, type,
1032 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1033 qd->qd_id);
1034
1035 return 0;
1036 }
1037
1038 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1039 {
1040 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1041 struct gfs2_qadata *qa = ip->i_qadata;
1042 struct gfs2_quota_data *qd;
1043 s64 value;
1044 unsigned int x;
1045 int error = 0;
1046
1047 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1048 return 0;
1049
1050 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1051 return 0;
1052
1053 for (x = 0; x < qa->qa_qd_num; x++) {
1054 qd = qa->qa_qd[x];
1055
1056 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1057 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1058 continue;
1059
1060 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1061 spin_lock(&qd_lru_lock);
1062 value += qd->qd_change;
1063 spin_unlock(&qd_lru_lock);
1064
1065 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1066 print_message(qd, "exceeded");
1067 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1068 USRQUOTA : GRPQUOTA, qd->qd_id,
1069 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1070
1071 error = -EDQUOT;
1072 break;
1073 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1074 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1075 time_after_eq(jiffies, qd->qd_last_warn +
1076 gfs2_tune_get(sdp,
1077 gt_quota_warn_period) * HZ)) {
1078 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1079 USRQUOTA : GRPQUOTA, qd->qd_id,
1080 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1081 error = print_message(qd, "warning");
1082 qd->qd_last_warn = jiffies;
1083 }
1084 }
1085
1086 return error;
1087 }
1088
1089 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1090 u32 uid, u32 gid)
1091 {
1092 struct gfs2_qadata *qa = ip->i_qadata;
1093 struct gfs2_quota_data *qd;
1094 unsigned int x;
1095
1096 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1097 return;
1098 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1099 return;
1100
1101 for (x = 0; x < qa->qa_qd_num; x++) {
1102 qd = qa->qa_qd[x];
1103
1104 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1105 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1106 do_qc(qd, change);
1107 }
1108 }
1109 }
1110
1111 int gfs2_quota_sync(struct super_block *sb, int type, int wait)
1112 {
1113 struct gfs2_sbd *sdp = sb->s_fs_info;
1114 struct gfs2_quota_data **qda;
1115 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1116 unsigned int num_qd;
1117 unsigned int x;
1118 int error = 0;
1119
1120 sdp->sd_quota_sync_gen++;
1121
1122 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1123 if (!qda)
1124 return -ENOMEM;
1125
1126 do {
1127 num_qd = 0;
1128
1129 for (;;) {
1130 error = qd_fish(sdp, qda + num_qd);
1131 if (error || !qda[num_qd])
1132 break;
1133 if (++num_qd == max_qd)
1134 break;
1135 }
1136
1137 if (num_qd) {
1138 if (!error)
1139 error = do_sync(num_qd, qda);
1140 if (!error)
1141 for (x = 0; x < num_qd; x++)
1142 qda[x]->qd_sync_gen =
1143 sdp->sd_quota_sync_gen;
1144
1145 for (x = 0; x < num_qd; x++)
1146 qd_unlock(qda[x]);
1147 }
1148 } while (!error && num_qd == max_qd);
1149
1150 kfree(qda);
1151
1152 return error;
1153 }
1154
1155 static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1156 {
1157 return gfs2_quota_sync(sb, type, 0);
1158 }
1159
1160 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1161 {
1162 struct gfs2_quota_data *qd;
1163 struct gfs2_holder q_gh;
1164 int error;
1165
1166 error = qd_get(sdp, user, id, &qd);
1167 if (error)
1168 return error;
1169
1170 error = do_glock(qd, FORCE, &q_gh);
1171 if (!error)
1172 gfs2_glock_dq_uninit(&q_gh);
1173
1174 qd_put(qd);
1175 return error;
1176 }
1177
1178 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1179 {
1180 const struct gfs2_quota_change *str = buf;
1181
1182 qc->qc_change = be64_to_cpu(str->qc_change);
1183 qc->qc_flags = be32_to_cpu(str->qc_flags);
1184 qc->qc_id = be32_to_cpu(str->qc_id);
1185 }
1186
1187 int gfs2_quota_init(struct gfs2_sbd *sdp)
1188 {
1189 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1190 u64 size = i_size_read(sdp->sd_qc_inode);
1191 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1192 unsigned int x, slot = 0;
1193 unsigned int found = 0;
1194 u64 dblock;
1195 u32 extlen = 0;
1196 int error;
1197
1198 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1199 return -EIO;
1200
1201 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1202 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1203
1204 error = -ENOMEM;
1205
1206 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1207 sizeof(unsigned char *), GFP_NOFS);
1208 if (!sdp->sd_quota_bitmap)
1209 return error;
1210
1211 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1212 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1213 if (!sdp->sd_quota_bitmap[x])
1214 goto fail;
1215 }
1216
1217 for (x = 0; x < blocks; x++) {
1218 struct buffer_head *bh;
1219 unsigned int y;
1220
1221 if (!extlen) {
1222 int new = 0;
1223 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1224 if (error)
1225 goto fail;
1226 }
1227 error = -EIO;
1228 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1229 if (!bh)
1230 goto fail;
1231 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1232 brelse(bh);
1233 goto fail;
1234 }
1235
1236 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1237 y++, slot++) {
1238 struct gfs2_quota_change_host qc;
1239 struct gfs2_quota_data *qd;
1240
1241 gfs2_quota_change_in(&qc, bh->b_data +
1242 sizeof(struct gfs2_meta_header) +
1243 y * sizeof(struct gfs2_quota_change));
1244 if (!qc.qc_change)
1245 continue;
1246
1247 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1248 qc.qc_id, &qd);
1249 if (error) {
1250 brelse(bh);
1251 goto fail;
1252 }
1253
1254 set_bit(QDF_CHANGE, &qd->qd_flags);
1255 qd->qd_change = qc.qc_change;
1256 qd->qd_slot = slot;
1257 qd->qd_slot_count = 1;
1258
1259 spin_lock(&qd_lru_lock);
1260 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1261 list_add(&qd->qd_list, &sdp->sd_quota_list);
1262 atomic_inc(&sdp->sd_quota_count);
1263 spin_unlock(&qd_lru_lock);
1264
1265 found++;
1266 }
1267
1268 brelse(bh);
1269 dblock++;
1270 extlen--;
1271 }
1272
1273 if (found)
1274 fs_info(sdp, "found %u quota changes\n", found);
1275
1276 return 0;
1277
1278 fail:
1279 gfs2_quota_cleanup(sdp);
1280 return error;
1281 }
1282
1283 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1284 {
1285 struct list_head *head = &sdp->sd_quota_list;
1286 struct gfs2_quota_data *qd;
1287 unsigned int x;
1288
1289 spin_lock(&qd_lru_lock);
1290 while (!list_empty(head)) {
1291 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1292
1293 if (atomic_read(&qd->qd_count) > 1 ||
1294 (atomic_read(&qd->qd_count) &&
1295 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1296 list_move(&qd->qd_list, head);
1297 spin_unlock(&qd_lru_lock);
1298 schedule();
1299 spin_lock(&qd_lru_lock);
1300 continue;
1301 }
1302
1303 list_del(&qd->qd_list);
1304 /* Also remove if this qd exists in the reclaim list */
1305 if (!list_empty(&qd->qd_reclaim)) {
1306 list_del_init(&qd->qd_reclaim);
1307 atomic_dec(&qd_lru_count);
1308 }
1309 atomic_dec(&sdp->sd_quota_count);
1310 spin_unlock(&qd_lru_lock);
1311
1312 if (!atomic_read(&qd->qd_count)) {
1313 gfs2_assert_warn(sdp, !qd->qd_change);
1314 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1315 } else
1316 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1317 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1318
1319 gfs2_glock_put(qd->qd_gl);
1320 kmem_cache_free(gfs2_quotad_cachep, qd);
1321
1322 spin_lock(&qd_lru_lock);
1323 }
1324 spin_unlock(&qd_lru_lock);
1325
1326 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1327
1328 if (sdp->sd_quota_bitmap) {
1329 for (x = 0; x < sdp->sd_quota_chunks; x++)
1330 kfree(sdp->sd_quota_bitmap[x]);
1331 kfree(sdp->sd_quota_bitmap);
1332 }
1333 }
1334
1335 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1336 {
1337 if (error == 0 || error == -EROFS)
1338 return;
1339 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1340 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1341 }
1342
1343 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1344 int (*fxn)(struct super_block *sb, int type),
1345 unsigned long t, unsigned long *timeo,
1346 unsigned int *new_timeo)
1347 {
1348 if (t >= *timeo) {
1349 int error = fxn(sdp->sd_vfs, 0);
1350 quotad_error(sdp, msg, error);
1351 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1352 } else {
1353 *timeo -= t;
1354 }
1355 }
1356
1357 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1358 {
1359 struct gfs2_inode *ip;
1360
1361 while(1) {
1362 ip = NULL;
1363 spin_lock(&sdp->sd_trunc_lock);
1364 if (!list_empty(&sdp->sd_trunc_list)) {
1365 ip = list_entry(sdp->sd_trunc_list.next,
1366 struct gfs2_inode, i_trunc_list);
1367 list_del_init(&ip->i_trunc_list);
1368 }
1369 spin_unlock(&sdp->sd_trunc_lock);
1370 if (ip == NULL)
1371 return;
1372 gfs2_glock_finish_truncate(ip);
1373 }
1374 }
1375
1376 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1377 if (!sdp->sd_statfs_force_sync) {
1378 sdp->sd_statfs_force_sync = 1;
1379 wake_up(&sdp->sd_quota_wait);
1380 }
1381 }
1382
1383
1384 /**
1385 * gfs2_quotad - Write cached quota changes into the quota file
1386 * @sdp: Pointer to GFS2 superblock
1387 *
1388 */
1389
1390 int gfs2_quotad(void *data)
1391 {
1392 struct gfs2_sbd *sdp = data;
1393 struct gfs2_tune *tune = &sdp->sd_tune;
1394 unsigned long statfs_timeo = 0;
1395 unsigned long quotad_timeo = 0;
1396 unsigned long t = 0;
1397 DEFINE_WAIT(wait);
1398 int empty;
1399
1400 while (!kthread_should_stop()) {
1401
1402 /* Update the master statfs file */
1403 if (sdp->sd_statfs_force_sync) {
1404 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1405 quotad_error(sdp, "statfs", error);
1406 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1407 }
1408 else
1409 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1410 &statfs_timeo,
1411 &tune->gt_statfs_quantum);
1412
1413 /* Update quota file */
1414 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
1415 &quotad_timeo, &tune->gt_quota_quantum);
1416
1417 /* Check for & recover partially truncated inodes */
1418 quotad_check_trunc_list(sdp);
1419
1420 try_to_freeze();
1421
1422 t = min(quotad_timeo, statfs_timeo);
1423
1424 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1425 spin_lock(&sdp->sd_trunc_lock);
1426 empty = list_empty(&sdp->sd_trunc_list);
1427 spin_unlock(&sdp->sd_trunc_lock);
1428 if (empty && !sdp->sd_statfs_force_sync)
1429 t -= schedule_timeout(t);
1430 else
1431 t = 0;
1432 finish_wait(&sdp->sd_quota_wait, &wait);
1433 }
1434
1435 return 0;
1436 }
1437
1438 static int gfs2_quota_get_xstate(struct super_block *sb,
1439 struct fs_quota_stat *fqs)
1440 {
1441 struct gfs2_sbd *sdp = sb->s_fs_info;
1442
1443 memset(fqs, 0, sizeof(struct fs_quota_stat));
1444 fqs->qs_version = FS_QSTAT_VERSION;
1445
1446 switch (sdp->sd_args.ar_quota) {
1447 case GFS2_QUOTA_ON:
1448 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1449 /*FALLTHRU*/
1450 case GFS2_QUOTA_ACCOUNT:
1451 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1452 break;
1453 case GFS2_QUOTA_OFF:
1454 break;
1455 }
1456
1457 if (sdp->sd_quota_inode) {
1458 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1459 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1460 }
1461 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1462 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1463 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1464 return 0;
1465 }
1466
1467 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1468 struct fs_disk_quota *fdq)
1469 {
1470 struct gfs2_sbd *sdp = sb->s_fs_info;
1471 struct gfs2_quota_lvb *qlvb;
1472 struct gfs2_quota_data *qd;
1473 struct gfs2_holder q_gh;
1474 int error;
1475
1476 memset(fdq, 0, sizeof(struct fs_disk_quota));
1477
1478 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1479 return -ESRCH; /* Crazy XFS error code */
1480
1481 if (type == USRQUOTA)
1482 type = QUOTA_USER;
1483 else if (type == GRPQUOTA)
1484 type = QUOTA_GROUP;
1485 else
1486 return -EINVAL;
1487
1488 error = qd_get(sdp, type, id, &qd);
1489 if (error)
1490 return error;
1491 error = do_glock(qd, FORCE, &q_gh);
1492 if (error)
1493 goto out;
1494
1495 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1496 fdq->d_version = FS_DQUOT_VERSION;
1497 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1498 fdq->d_id = id;
1499 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1500 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1501 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1502
1503 gfs2_glock_dq_uninit(&q_gh);
1504 out:
1505 qd_put(qd);
1506 return error;
1507 }
1508
1509 /* GFS2 only supports a subset of the XFS fields */
1510 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1511
1512 static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id,
1513 struct fs_disk_quota *fdq)
1514 {
1515 struct gfs2_sbd *sdp = sb->s_fs_info;
1516 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1517 struct gfs2_quota_data *qd;
1518 struct gfs2_holder q_gh, i_gh;
1519 unsigned int data_blocks, ind_blocks;
1520 unsigned int blocks = 0;
1521 int alloc_required;
1522 loff_t offset;
1523 int error;
1524
1525 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1526 return -ESRCH; /* Crazy XFS error code */
1527
1528 switch(type) {
1529 case USRQUOTA:
1530 type = QUOTA_USER;
1531 if (fdq->d_flags != FS_USER_QUOTA)
1532 return -EINVAL;
1533 break;
1534 case GRPQUOTA:
1535 type = QUOTA_GROUP;
1536 if (fdq->d_flags != FS_GROUP_QUOTA)
1537 return -EINVAL;
1538 break;
1539 default:
1540 return -EINVAL;
1541 }
1542
1543 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1544 return -EINVAL;
1545 if (fdq->d_id != id)
1546 return -EINVAL;
1547
1548 error = qd_get(sdp, type, id, &qd);
1549 if (error)
1550 return error;
1551
1552 mutex_lock(&ip->i_inode.i_mutex);
1553 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1554 if (error)
1555 goto out_put;
1556 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1557 if (error)
1558 goto out_q;
1559
1560 /* Check for existing entry, if none then alloc new blocks */
1561 error = update_qd(sdp, qd);
1562 if (error)
1563 goto out_i;
1564
1565 /* If nothing has changed, this is a no-op */
1566 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1567 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1568 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1569
1570 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1571 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1572 fdq->d_fieldmask ^= FS_DQ_BHARD;
1573
1574 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1575 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1576 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1577
1578 if (fdq->d_fieldmask == 0)
1579 goto out_i;
1580
1581 offset = qd2offset(qd);
1582 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1583 if (gfs2_is_stuffed(ip))
1584 alloc_required = 1;
1585 if (alloc_required) {
1586 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1587 &data_blocks, &ind_blocks);
1588 blocks = 1 + data_blocks + ind_blocks;
1589 error = gfs2_inplace_reserve(ip, blocks);
1590 if (error)
1591 goto out_i;
1592 blocks += gfs2_rg_blocks(ip);
1593 }
1594
1595 /* Some quotas span block boundaries and can update two blocks,
1596 adding an extra block to the transaction to handle such quotas */
1597 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1598 if (error)
1599 goto out_release;
1600
1601 /* Apply changes */
1602 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1603
1604 gfs2_trans_end(sdp);
1605 out_release:
1606 if (alloc_required)
1607 gfs2_inplace_release(ip);
1608 out_i:
1609 gfs2_glock_dq_uninit(&i_gh);
1610 out_q:
1611 gfs2_glock_dq_uninit(&q_gh);
1612 out_put:
1613 mutex_unlock(&ip->i_inode.i_mutex);
1614 qd_put(qd);
1615 return error;
1616 }
1617
1618 const struct quotactl_ops gfs2_quotactl_ops = {
1619 .quota_sync = gfs2_quota_sync,
1620 .get_xstate = gfs2_quota_get_xstate,
1621 .get_dqblk = gfs2_get_dqblk,
1622 .set_dqblk = gfs2_set_dqblk,
1623 };
Linux 2.6 libata-dev (mirror)