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Staging: hv: fix smp problems in the hyperv core code
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / gfs2 / quota.c
blobe3bf6eab8750011a9e582a0f465bbf3dc49b8612
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 /*
11 * Quota change tags are associated with each transaction that allocates or
12 * deallocates space. Those changes are accumulated locally to each node (in a
13 * per-node file) and then are periodically synced to the quota file. This
14 * avoids the bottleneck of constantly touching the quota file, but introduces
15 * fuzziness in the current usage value of IDs that are being used on different
16 * nodes in the cluster simultaneously. So, it is possible for a user on
17 * multiple nodes to overrun their quota, but that overrun is controlable.
18 * Since quota tags are part of transactions, there is no need for a quota check
19 * program to be run on node crashes or anything like that.
20 *
21 * There are couple of knobs that let the administrator manage the quota
22 * fuzziness. "quota_quantum" sets the maximum time a quota change can be
23 * sitting on one node before being synced to the quota file. (The default is
24 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency
25 * of quota file syncs increases as the user moves closer to their limit. The
26 * more frequent the syncs, the more accurate the quota enforcement, but that
27 * means that there is more contention between the nodes for the quota file.
28 * The default value is one. This sets the maximum theoretical quota overrun
29 * (with infinite node with infinite bandwidth) to twice the user's limit. (In
30 * practice, the maximum overrun you see should be much less.) A "quota_scale"
31 * number greater than one makes quota syncs more frequent and reduces the
32 * maximum overrun. Numbers less than one (but greater than zero) make quota
33 * syncs less frequent.
34 *
35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
36 * the quota file, so it is not being constantly read.
37 */
38
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/spinlock.h>
42 #include <linux/completion.h>
43 #include <linux/buffer_head.h>
44 #include <linux/sort.h>
45 #include <linux/fs.h>
46 #include <linux/bio.h>
47 #include <linux/gfs2_ondisk.h>
48 #include <linux/kthread.h>
49 #include <linux/freezer.h>
50 #include <linux/quota.h>
51 #include <linux/dqblk_xfs.h>
52
53 #include "gfs2.h"
54 #include "incore.h"
55 #include "bmap.h"
56 #include "glock.h"
57 #include "glops.h"
58 #include "log.h"
59 #include "meta_io.h"
60 #include "quota.h"
61 #include "rgrp.h"
62 #include "super.h"
63 #include "trans.h"
64 #include "inode.h"
65 #include "util.h"
66
67 #define QUOTA_USER 1
68 #define QUOTA_GROUP 0
69
70 struct gfs2_quota_change_host {
71 u64 qc_change;
72 u32 qc_flags; /* GFS2_QCF_... */
73 u32 qc_id;
74 };
75
76 static LIST_HEAD(qd_lru_list);
77 static atomic_t qd_lru_count = ATOMIC_INIT(0);
78 static DEFINE_SPINLOCK(qd_lru_lock);
79
80 int gfs2_shrink_qd_memory(int nr, gfp_t gfp_mask)
81 {
82 struct gfs2_quota_data *qd;
83 struct gfs2_sbd *sdp;
84
85 if (nr == 0)
86 goto out;
87
88 if (!(gfp_mask & __GFP_FS))
89 return -1;
90
91 spin_lock(&qd_lru_lock);
92 while (nr && !list_empty(&qd_lru_list)) {
93 qd = list_entry(qd_lru_list.next,
94 struct gfs2_quota_data, qd_reclaim);
95 sdp = qd->qd_gl->gl_sbd;
96
97 /* Free from the filesystem-specific list */
98 list_del(&qd->qd_list);
99
100 gfs2_assert_warn(sdp, !qd->qd_change);
101 gfs2_assert_warn(sdp, !qd->qd_slot_count);
102 gfs2_assert_warn(sdp, !qd->qd_bh_count);
103
104 gfs2_glock_put(qd->qd_gl);
105 atomic_dec(&sdp->sd_quota_count);
106
107 /* Delete it from the common reclaim list */
108 list_del_init(&qd->qd_reclaim);
109 atomic_dec(&qd_lru_count);
110 spin_unlock(&qd_lru_lock);
111 kmem_cache_free(gfs2_quotad_cachep, qd);
112 spin_lock(&qd_lru_lock);
113 nr--;
114 }
115 spin_unlock(&qd_lru_lock);
116
117 out:
118 return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
119 }
120
121 static u64 qd2offset(struct gfs2_quota_data *qd)
122 {
123 u64 offset;
124
125 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
126 offset *= sizeof(struct gfs2_quota);
127
128 return offset;
129 }
130
131 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
132 struct gfs2_quota_data **qdp)
133 {
134 struct gfs2_quota_data *qd;
135 int error;
136
137 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
138 if (!qd)
139 return -ENOMEM;
140
141 atomic_set(&qd->qd_count, 1);
142 qd->qd_id = id;
143 if (user)
144 set_bit(QDF_USER, &qd->qd_flags);
145 qd->qd_slot = -1;
146 INIT_LIST_HEAD(&qd->qd_reclaim);
147
148 error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
149 &gfs2_quota_glops, CREATE, &qd->qd_gl);
150 if (error)
151 goto fail;
152
153 *qdp = qd;
154
155 return 0;
156
157 fail:
158 kmem_cache_free(gfs2_quotad_cachep, qd);
159 return error;
160 }
161
162 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
163 struct gfs2_quota_data **qdp)
164 {
165 struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
166 int error, found;
167
168 *qdp = NULL;
169
170 for (;;) {
171 found = 0;
172 spin_lock(&qd_lru_lock);
173 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
174 if (qd->qd_id == id &&
175 !test_bit(QDF_USER, &qd->qd_flags) == !user) {
176 if (!atomic_read(&qd->qd_count) &&
177 !list_empty(&qd->qd_reclaim)) {
178 /* Remove it from reclaim list */
179 list_del_init(&qd->qd_reclaim);
180 atomic_dec(&qd_lru_count);
181 }
182 atomic_inc(&qd->qd_count);
183 found = 1;
184 break;
185 }
186 }
187
188 if (!found)
189 qd = NULL;
190
191 if (!qd && new_qd) {
192 qd = new_qd;
193 list_add(&qd->qd_list, &sdp->sd_quota_list);
194 atomic_inc(&sdp->sd_quota_count);
195 new_qd = NULL;
196 }
197
198 spin_unlock(&qd_lru_lock);
199
200 if (qd) {
201 if (new_qd) {
202 gfs2_glock_put(new_qd->qd_gl);
203 kmem_cache_free(gfs2_quotad_cachep, new_qd);
204 }
205 *qdp = qd;
206 return 0;
207 }
208
209 error = qd_alloc(sdp, user, id, &new_qd);
210 if (error)
211 return error;
212 }
213 }
214
215 static void qd_hold(struct gfs2_quota_data *qd)
216 {
217 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
218 gfs2_assert(sdp, atomic_read(&qd->qd_count));
219 atomic_inc(&qd->qd_count);
220 }
221
222 static void qd_put(struct gfs2_quota_data *qd)
223 {
224 if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
225 /* Add to the reclaim list */
226 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
227 atomic_inc(&qd_lru_count);
228 spin_unlock(&qd_lru_lock);
229 }
230 }
231
232 static int slot_get(struct gfs2_quota_data *qd)
233 {
234 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
235 unsigned int c, o = 0, b;
236 unsigned char byte = 0;
237
238 spin_lock(&qd_lru_lock);
239
240 if (qd->qd_slot_count++) {
241 spin_unlock(&qd_lru_lock);
242 return 0;
243 }
244
245 for (c = 0; c < sdp->sd_quota_chunks; c++)
246 for (o = 0; o < PAGE_SIZE; o++) {
247 byte = sdp->sd_quota_bitmap[c][o];
248 if (byte != 0xFF)
249 goto found;
250 }
251
252 goto fail;
253
254 found:
255 for (b = 0; b < 8; b++)
256 if (!(byte & (1 << b)))
257 break;
258 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
259
260 if (qd->qd_slot >= sdp->sd_quota_slots)
261 goto fail;
262
263 sdp->sd_quota_bitmap[c][o] |= 1 << b;
264
265 spin_unlock(&qd_lru_lock);
266
267 return 0;
268
269 fail:
270 qd->qd_slot_count--;
271 spin_unlock(&qd_lru_lock);
272 return -ENOSPC;
273 }
274
275 static void slot_hold(struct gfs2_quota_data *qd)
276 {
277 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
278
279 spin_lock(&qd_lru_lock);
280 gfs2_assert(sdp, qd->qd_slot_count);
281 qd->qd_slot_count++;
282 spin_unlock(&qd_lru_lock);
283 }
284
285 static void slot_put(struct gfs2_quota_data *qd)
286 {
287 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
288
289 spin_lock(&qd_lru_lock);
290 gfs2_assert(sdp, qd->qd_slot_count);
291 if (!--qd->qd_slot_count) {
292 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
293 qd->qd_slot = -1;
294 }
295 spin_unlock(&qd_lru_lock);
296 }
297
298 static int bh_get(struct gfs2_quota_data *qd)
299 {
300 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
301 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
302 unsigned int block, offset;
303 struct buffer_head *bh;
304 int error;
305 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
306
307 mutex_lock(&sdp->sd_quota_mutex);
308
309 if (qd->qd_bh_count++) {
310 mutex_unlock(&sdp->sd_quota_mutex);
311 return 0;
312 }
313
314 block = qd->qd_slot / sdp->sd_qc_per_block;
315 offset = qd->qd_slot % sdp->sd_qc_per_block;
316
317 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
318 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
319 if (error)
320 goto fail;
321 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
322 if (error)
323 goto fail;
324 error = -EIO;
325 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
326 goto fail_brelse;
327
328 qd->qd_bh = bh;
329 qd->qd_bh_qc = (struct gfs2_quota_change *)
330 (bh->b_data + sizeof(struct gfs2_meta_header) +
331 offset * sizeof(struct gfs2_quota_change));
332
333 mutex_unlock(&sdp->sd_quota_mutex);
334
335 return 0;
336
337 fail_brelse:
338 brelse(bh);
339 fail:
340 qd->qd_bh_count--;
341 mutex_unlock(&sdp->sd_quota_mutex);
342 return error;
343 }
344
345 static void bh_put(struct gfs2_quota_data *qd)
346 {
347 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
348
349 mutex_lock(&sdp->sd_quota_mutex);
350 gfs2_assert(sdp, qd->qd_bh_count);
351 if (!--qd->qd_bh_count) {
352 brelse(qd->qd_bh);
353 qd->qd_bh = NULL;
354 qd->qd_bh_qc = NULL;
355 }
356 mutex_unlock(&sdp->sd_quota_mutex);
357 }
358
359 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
360 {
361 struct gfs2_quota_data *qd = NULL;
362 int error;
363 int found = 0;
364
365 *qdp = NULL;
366
367 if (sdp->sd_vfs->s_flags & MS_RDONLY)
368 return 0;
369
370 spin_lock(&qd_lru_lock);
371
372 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
373 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
374 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
375 qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
376 continue;
377
378 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
379
380 set_bit(QDF_LOCKED, &qd->qd_flags);
381 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
382 atomic_inc(&qd->qd_count);
383 qd->qd_change_sync = qd->qd_change;
384 gfs2_assert_warn(sdp, qd->qd_slot_count);
385 qd->qd_slot_count++;
386 found = 1;
387
388 break;
389 }
390
391 if (!found)
392 qd = NULL;
393
394 spin_unlock(&qd_lru_lock);
395
396 if (qd) {
397 gfs2_assert_warn(sdp, qd->qd_change_sync);
398 error = bh_get(qd);
399 if (error) {
400 clear_bit(QDF_LOCKED, &qd->qd_flags);
401 slot_put(qd);
402 qd_put(qd);
403 return error;
404 }
405 }
406
407 *qdp = qd;
408
409 return 0;
410 }
411
412 static int qd_trylock(struct gfs2_quota_data *qd)
413 {
414 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
415
416 if (sdp->sd_vfs->s_flags & MS_RDONLY)
417 return 0;
418
419 spin_lock(&qd_lru_lock);
420
421 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
422 !test_bit(QDF_CHANGE, &qd->qd_flags)) {
423 spin_unlock(&qd_lru_lock);
424 return 0;
425 }
426
427 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
428
429 set_bit(QDF_LOCKED, &qd->qd_flags);
430 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
431 atomic_inc(&qd->qd_count);
432 qd->qd_change_sync = qd->qd_change;
433 gfs2_assert_warn(sdp, qd->qd_slot_count);
434 qd->qd_slot_count++;
435
436 spin_unlock(&qd_lru_lock);
437
438 gfs2_assert_warn(sdp, qd->qd_change_sync);
439 if (bh_get(qd)) {
440 clear_bit(QDF_LOCKED, &qd->qd_flags);
441 slot_put(qd);
442 qd_put(qd);
443 return 0;
444 }
445
446 return 1;
447 }
448
449 static void qd_unlock(struct gfs2_quota_data *qd)
450 {
451 gfs2_assert_warn(qd->qd_gl->gl_sbd,
452 test_bit(QDF_LOCKED, &qd->qd_flags));
453 clear_bit(QDF_LOCKED, &qd->qd_flags);
454 bh_put(qd);
455 slot_put(qd);
456 qd_put(qd);
457 }
458
459 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
460 struct gfs2_quota_data **qdp)
461 {
462 int error;
463
464 error = qd_get(sdp, user, id, qdp);
465 if (error)
466 return error;
467
468 error = slot_get(*qdp);
469 if (error)
470 goto fail;
471
472 error = bh_get(*qdp);
473 if (error)
474 goto fail_slot;
475
476 return 0;
477
478 fail_slot:
479 slot_put(*qdp);
480 fail:
481 qd_put(*qdp);
482 return error;
483 }
484
485 static void qdsb_put(struct gfs2_quota_data *qd)
486 {
487 bh_put(qd);
488 slot_put(qd);
489 qd_put(qd);
490 }
491
492 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
493 {
494 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
495 struct gfs2_alloc *al = ip->i_alloc;
496 struct gfs2_quota_data **qd = al->al_qd;
497 int error;
498
499 if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
500 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
501 return -EIO;
502
503 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
504 return 0;
505
506 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
507 if (error)
508 goto out;
509 al->al_qd_num++;
510 qd++;
511
512 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
513 if (error)
514 goto out;
515 al->al_qd_num++;
516 qd++;
517
518 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
519 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
520 if (error)
521 goto out;
522 al->al_qd_num++;
523 qd++;
524 }
525
526 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
527 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
528 if (error)
529 goto out;
530 al->al_qd_num++;
531 qd++;
532 }
533
534 out:
535 if (error)
536 gfs2_quota_unhold(ip);
537 return error;
538 }
539
540 void gfs2_quota_unhold(struct gfs2_inode *ip)
541 {
542 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
543 struct gfs2_alloc *al = ip->i_alloc;
544 unsigned int x;
545
546 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
547
548 for (x = 0; x < al->al_qd_num; x++) {
549 qdsb_put(al->al_qd[x]);
550 al->al_qd[x] = NULL;
551 }
552 al->al_qd_num = 0;
553 }
554
555 static int sort_qd(const void *a, const void *b)
556 {
557 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
558 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
559
560 if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
561 !test_bit(QDF_USER, &qd_b->qd_flags)) {
562 if (test_bit(QDF_USER, &qd_a->qd_flags))
563 return -1;
564 else
565 return 1;
566 }
567 if (qd_a->qd_id < qd_b->qd_id)
568 return -1;
569 if (qd_a->qd_id > qd_b->qd_id)
570 return 1;
571
572 return 0;
573 }
574
575 static void do_qc(struct gfs2_quota_data *qd, s64 change)
576 {
577 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
578 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
579 struct gfs2_quota_change *qc = qd->qd_bh_qc;
580 s64 x;
581
582 mutex_lock(&sdp->sd_quota_mutex);
583 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
584
585 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
586 qc->qc_change = 0;
587 qc->qc_flags = 0;
588 if (test_bit(QDF_USER, &qd->qd_flags))
589 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
590 qc->qc_id = cpu_to_be32(qd->qd_id);
591 }
592
593 x = be64_to_cpu(qc->qc_change) + change;
594 qc->qc_change = cpu_to_be64(x);
595
596 spin_lock(&qd_lru_lock);
597 qd->qd_change = x;
598 spin_unlock(&qd_lru_lock);
599
600 if (!x) {
601 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
602 clear_bit(QDF_CHANGE, &qd->qd_flags);
603 qc->qc_flags = 0;
604 qc->qc_id = 0;
605 slot_put(qd);
606 qd_put(qd);
607 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
608 qd_hold(qd);
609 slot_hold(qd);
610 }
611
612 mutex_unlock(&sdp->sd_quota_mutex);
613 }
614
615 /**
616 * gfs2_adjust_quota - adjust record of current block usage
617 * @ip: The quota inode
618 * @loc: Offset of the entry in the quota file
619 * @change: The amount of usage change to record
620 * @qd: The quota data
621 * @fdq: The updated limits to record
622 *
623 * This function was mostly borrowed from gfs2_block_truncate_page which was
624 * in turn mostly borrowed from ext3
625 *
626 * Returns: 0 or -ve on error
627 */
628
629 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
630 s64 change, struct gfs2_quota_data *qd,
631 struct fs_disk_quota *fdq)
632 {
633 struct inode *inode = &ip->i_inode;
634 struct address_space *mapping = inode->i_mapping;
635 unsigned long index = loc >> PAGE_CACHE_SHIFT;
636 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
637 unsigned blocksize, iblock, pos;
638 struct buffer_head *bh, *dibh;
639 struct page *page;
640 void *kaddr;
641 struct gfs2_quota *qp;
642 s64 value;
643 int err = -EIO;
644 u64 size;
645
646 if (gfs2_is_stuffed(ip))
647 gfs2_unstuff_dinode(ip, NULL);
648
649 page = grab_cache_page(mapping, index);
650 if (!page)
651 return -ENOMEM;
652
653 blocksize = inode->i_sb->s_blocksize;
654 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
655
656 if (!page_has_buffers(page))
657 create_empty_buffers(page, blocksize, 0);
658
659 bh = page_buffers(page);
660 pos = blocksize;
661 while (offset >= pos) {
662 bh = bh->b_this_page;
663 iblock++;
664 pos += blocksize;
665 }
666
667 if (!buffer_mapped(bh)) {
668 gfs2_block_map(inode, iblock, bh, 1);
669 if (!buffer_mapped(bh))
670 goto unlock;
671 }
672
673 if (PageUptodate(page))
674 set_buffer_uptodate(bh);
675
676 if (!buffer_uptodate(bh)) {
677 ll_rw_block(READ_META, 1, &bh);
678 wait_on_buffer(bh);
679 if (!buffer_uptodate(bh))
680 goto unlock;
681 }
682
683 gfs2_trans_add_bh(ip->i_gl, bh, 0);
684
685 kaddr = kmap_atomic(page, KM_USER0);
686 qp = kaddr + offset;
687 value = (s64)be64_to_cpu(qp->qu_value) + change;
688 qp->qu_value = cpu_to_be64(value);
689 qd->qd_qb.qb_value = qp->qu_value;
690 if (fdq) {
691 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
692 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit);
693 qd->qd_qb.qb_warn = qp->qu_warn;
694 }
695 if (fdq->d_fieldmask & FS_DQ_BHARD) {
696 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit);
697 qd->qd_qb.qb_limit = qp->qu_limit;
698 }
699 }
700 flush_dcache_page(page);
701 kunmap_atomic(kaddr, KM_USER0);
702
703 err = gfs2_meta_inode_buffer(ip, &dibh);
704 if (err)
705 goto unlock;
706
707 size = loc + sizeof(struct gfs2_quota);
708 if (size > inode->i_size) {
709 ip->i_disksize = size;
710 i_size_write(inode, size);
711 }
712 inode->i_mtime = inode->i_atime = CURRENT_TIME;
713 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
714 gfs2_dinode_out(ip, dibh->b_data);
715 brelse(dibh);
716 mark_inode_dirty(inode);
717
718 unlock:
719 unlock_page(page);
720 page_cache_release(page);
721 return err;
722 }
723
724 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
725 {
726 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
727 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
728 unsigned int data_blocks, ind_blocks;
729 struct gfs2_holder *ghs, i_gh;
730 unsigned int qx, x;
731 struct gfs2_quota_data *qd;
732 loff_t offset;
733 unsigned int nalloc = 0, blocks;
734 struct gfs2_alloc *al = NULL;
735 int error;
736
737 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
738 &data_blocks, &ind_blocks);
739
740 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
741 if (!ghs)
742 return -ENOMEM;
743
744 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
745 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
746 for (qx = 0; qx < num_qd; qx++) {
747 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
748 GL_NOCACHE, &ghs[qx]);
749 if (error)
750 goto out;
751 }
752
753 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
754 if (error)
755 goto out;
756
757 for (x = 0; x < num_qd; x++) {
758 int alloc_required;
759
760 offset = qd2offset(qda[x]);
761 error = gfs2_write_alloc_required(ip, offset,
762 sizeof(struct gfs2_quota),
763 &alloc_required);
764 if (error)
765 goto out_gunlock;
766 if (alloc_required)
767 nalloc++;
768 }
769
770 al = gfs2_alloc_get(ip);
771 if (!al) {
772 error = -ENOMEM;
773 goto out_gunlock;
774 }
775 /*
776 * 1 blk for unstuffing inode if stuffed. We add this extra
777 * block to the reservation unconditionally. If the inode
778 * doesn't need unstuffing, the block will be released to the
779 * rgrp since it won't be allocated during the transaction
780 */
781 al->al_requested = 1;
782 /* +1 in the end for block requested above for unstuffing */
783 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 1;
784
785 if (nalloc)
786 al->al_requested += nalloc * (data_blocks + ind_blocks);
787 error = gfs2_inplace_reserve(ip);
788 if (error)
789 goto out_alloc;
790
791 if (nalloc)
792 blocks += al->al_rgd->rd_length + nalloc * ind_blocks + RES_STATFS;
793
794 error = gfs2_trans_begin(sdp, blocks, 0);
795 if (error)
796 goto out_ipres;
797
798 for (x = 0; x < num_qd; x++) {
799 qd = qda[x];
800 offset = qd2offset(qd);
801 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
802 if (error)
803 goto out_end_trans;
804
805 do_qc(qd, -qd->qd_change_sync);
806 }
807
808 error = 0;
809
810 out_end_trans:
811 gfs2_trans_end(sdp);
812 out_ipres:
813 gfs2_inplace_release(ip);
814 out_alloc:
815 gfs2_alloc_put(ip);
816 out_gunlock:
817 gfs2_glock_dq_uninit(&i_gh);
818 out:
819 while (qx--)
820 gfs2_glock_dq_uninit(&ghs[qx]);
821 mutex_unlock(&ip->i_inode.i_mutex);
822 kfree(ghs);
823 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
824 return error;
825 }
826
827 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
828 {
829 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
830 struct gfs2_quota q;
831 struct gfs2_quota_lvb *qlvb;
832 loff_t pos;
833 int error;
834
835 memset(&q, 0, sizeof(struct gfs2_quota));
836 pos = qd2offset(qd);
837 error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));
838 if (error < 0)
839 return error;
840
841 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
842 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
843 qlvb->__pad = 0;
844 qlvb->qb_limit = q.qu_limit;
845 qlvb->qb_warn = q.qu_warn;
846 qlvb->qb_value = q.qu_value;
847 qd->qd_qb = *qlvb;
848
849 return 0;
850 }
851
852 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
853 struct gfs2_holder *q_gh)
854 {
855 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
856 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
857 struct gfs2_holder i_gh;
858 int error;
859
860 restart:
861 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
862 if (error)
863 return error;
864
865 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
866
867 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
868 gfs2_glock_dq_uninit(q_gh);
869 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
870 GL_NOCACHE, q_gh);
871 if (error)
872 return error;
873
874 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
875 if (error)
876 goto fail;
877
878 error = update_qd(sdp, qd);
879 if (error)
880 goto fail_gunlock;
881
882 gfs2_glock_dq_uninit(&i_gh);
883 gfs2_glock_dq_uninit(q_gh);
884 force_refresh = 0;
885 goto restart;
886 }
887
888 return 0;
889
890 fail_gunlock:
891 gfs2_glock_dq_uninit(&i_gh);
892 fail:
893 gfs2_glock_dq_uninit(q_gh);
894 return error;
895 }
896
897 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
898 {
899 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
900 struct gfs2_alloc *al = ip->i_alloc;
901 unsigned int x;
902 int error = 0;
903
904 gfs2_quota_hold(ip, uid, gid);
905
906 if (capable(CAP_SYS_RESOURCE) ||
907 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
908 return 0;
909
910 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
911 sort_qd, NULL);
912
913 for (x = 0; x < al->al_qd_num; x++) {
914 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
915 if (error)
916 break;
917 }
918
919 if (!error)
920 set_bit(GIF_QD_LOCKED, &ip->i_flags);
921 else {
922 while (x--)
923 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
924 gfs2_quota_unhold(ip);
925 }
926
927 return error;
928 }
929
930 static int need_sync(struct gfs2_quota_data *qd)
931 {
932 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
933 struct gfs2_tune *gt = &sdp->sd_tune;
934 s64 value;
935 unsigned int num, den;
936 int do_sync = 1;
937
938 if (!qd->qd_qb.qb_limit)
939 return 0;
940
941 spin_lock(&qd_lru_lock);
942 value = qd->qd_change;
943 spin_unlock(&qd_lru_lock);
944
945 spin_lock(&gt->gt_spin);
946 num = gt->gt_quota_scale_num;
947 den = gt->gt_quota_scale_den;
948 spin_unlock(&gt->gt_spin);
949
950 if (value < 0)
951 do_sync = 0;
952 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
953 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
954 do_sync = 0;
955 else {
956 value *= gfs2_jindex_size(sdp) * num;
957 value = div_s64(value, den);
958 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
959 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
960 do_sync = 0;
961 }
962
963 return do_sync;
964 }
965
966 void gfs2_quota_unlock(struct gfs2_inode *ip)
967 {
968 struct gfs2_alloc *al = ip->i_alloc;
969 struct gfs2_quota_data *qda[4];
970 unsigned int count = 0;
971 unsigned int x;
972
973 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
974 goto out;
975
976 for (x = 0; x < al->al_qd_num; x++) {
977 struct gfs2_quota_data *qd;
978 int sync;
979
980 qd = al->al_qd[x];
981 sync = need_sync(qd);
982
983 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
984
985 if (sync && qd_trylock(qd))
986 qda[count++] = qd;
987 }
988
989 if (count) {
990 do_sync(count, qda);
991 for (x = 0; x < count; x++)
992 qd_unlock(qda[x]);
993 }
994
995 out:
996 gfs2_quota_unhold(ip);
997 }
998
999 #define MAX_LINE 256
1000
1001 static int print_message(struct gfs2_quota_data *qd, char *type)
1002 {
1003 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1004
1005 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1006 sdp->sd_fsname, type,
1007 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1008 qd->qd_id);
1009
1010 return 0;
1011 }
1012
1013 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
1014 {
1015 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1016 struct gfs2_alloc *al = ip->i_alloc;
1017 struct gfs2_quota_data *qd;
1018 s64 value;
1019 unsigned int x;
1020 int error = 0;
1021
1022 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1023 return 0;
1024
1025 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1026 return 0;
1027
1028 for (x = 0; x < al->al_qd_num; x++) {
1029 qd = al->al_qd[x];
1030
1031 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1032 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1033 continue;
1034
1035 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1036 spin_lock(&qd_lru_lock);
1037 value += qd->qd_change;
1038 spin_unlock(&qd_lru_lock);
1039
1040 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1041 print_message(qd, "exceeded");
1042 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1043 USRQUOTA : GRPQUOTA, qd->qd_id,
1044 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1045
1046 error = -EDQUOT;
1047 break;
1048 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1049 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1050 time_after_eq(jiffies, qd->qd_last_warn +
1051 gfs2_tune_get(sdp,
1052 gt_quota_warn_period) * HZ)) {
1053 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1054 USRQUOTA : GRPQUOTA, qd->qd_id,
1055 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1056 error = print_message(qd, "warning");
1057 qd->qd_last_warn = jiffies;
1058 }
1059 }
1060
1061 return error;
1062 }
1063
1064 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1065 u32 uid, u32 gid)
1066 {
1067 struct gfs2_alloc *al = ip->i_alloc;
1068 struct gfs2_quota_data *qd;
1069 unsigned int x;
1070
1071 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1072 return;
1073 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1074 return;
1075
1076 for (x = 0; x < al->al_qd_num; x++) {
1077 qd = al->al_qd[x];
1078
1079 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1080 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1081 do_qc(qd, change);
1082 }
1083 }
1084 }
1085
1086 int gfs2_quota_sync(struct super_block *sb, int type)
1087 {
1088 struct gfs2_sbd *sdp = sb->s_fs_info;
1089 struct gfs2_quota_data **qda;
1090 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1091 unsigned int num_qd;
1092 unsigned int x;
1093 int error = 0;
1094
1095 sdp->sd_quota_sync_gen++;
1096
1097 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1098 if (!qda)
1099 return -ENOMEM;
1100
1101 do {
1102 num_qd = 0;
1103
1104 for (;;) {
1105 error = qd_fish(sdp, qda + num_qd);
1106 if (error || !qda[num_qd])
1107 break;
1108 if (++num_qd == max_qd)
1109 break;
1110 }
1111
1112 if (num_qd) {
1113 if (!error)
1114 error = do_sync(num_qd, qda);
1115 if (!error)
1116 for (x = 0; x < num_qd; x++)
1117 qda[x]->qd_sync_gen =
1118 sdp->sd_quota_sync_gen;
1119
1120 for (x = 0; x < num_qd; x++)
1121 qd_unlock(qda[x]);
1122 }
1123 } while (!error && num_qd == max_qd);
1124
1125 kfree(qda);
1126
1127 return error;
1128 }
1129
1130 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1131 {
1132 struct gfs2_quota_data *qd;
1133 struct gfs2_holder q_gh;
1134 int error;
1135
1136 error = qd_get(sdp, user, id, &qd);
1137 if (error)
1138 return error;
1139
1140 error = do_glock(qd, FORCE, &q_gh);
1141 if (!error)
1142 gfs2_glock_dq_uninit(&q_gh);
1143
1144 qd_put(qd);
1145 return error;
1146 }
1147
1148 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1149 {
1150 const struct gfs2_quota_change *str = buf;
1151
1152 qc->qc_change = be64_to_cpu(str->qc_change);
1153 qc->qc_flags = be32_to_cpu(str->qc_flags);
1154 qc->qc_id = be32_to_cpu(str->qc_id);
1155 }
1156
1157 int gfs2_quota_init(struct gfs2_sbd *sdp)
1158 {
1159 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1160 unsigned int blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
1161 unsigned int x, slot = 0;
1162 unsigned int found = 0;
1163 u64 dblock;
1164 u32 extlen = 0;
1165 int error;
1166
1167 if (!ip->i_disksize || ip->i_disksize > (64 << 20) ||
1168 ip->i_disksize & (sdp->sd_sb.sb_bsize - 1)) {
1169 gfs2_consist_inode(ip);
1170 return -EIO;
1171 }
1172 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1173 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1174
1175 error = -ENOMEM;
1176
1177 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1178 sizeof(unsigned char *), GFP_NOFS);
1179 if (!sdp->sd_quota_bitmap)
1180 return error;
1181
1182 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1183 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1184 if (!sdp->sd_quota_bitmap[x])
1185 goto fail;
1186 }
1187
1188 for (x = 0; x < blocks; x++) {
1189 struct buffer_head *bh;
1190 unsigned int y;
1191
1192 if (!extlen) {
1193 int new = 0;
1194 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1195 if (error)
1196 goto fail;
1197 }
1198 error = -EIO;
1199 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1200 if (!bh)
1201 goto fail;
1202 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1203 brelse(bh);
1204 goto fail;
1205 }
1206
1207 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1208 y++, slot++) {
1209 struct gfs2_quota_change_host qc;
1210 struct gfs2_quota_data *qd;
1211
1212 gfs2_quota_change_in(&qc, bh->b_data +
1213 sizeof(struct gfs2_meta_header) +
1214 y * sizeof(struct gfs2_quota_change));
1215 if (!qc.qc_change)
1216 continue;
1217
1218 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1219 qc.qc_id, &qd);
1220 if (error) {
1221 brelse(bh);
1222 goto fail;
1223 }
1224
1225 set_bit(QDF_CHANGE, &qd->qd_flags);
1226 qd->qd_change = qc.qc_change;
1227 qd->qd_slot = slot;
1228 qd->qd_slot_count = 1;
1229
1230 spin_lock(&qd_lru_lock);
1231 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1232 list_add(&qd->qd_list, &sdp->sd_quota_list);
1233 atomic_inc(&sdp->sd_quota_count);
1234 spin_unlock(&qd_lru_lock);
1235
1236 found++;
1237 }
1238
1239 brelse(bh);
1240 dblock++;
1241 extlen--;
1242 }
1243
1244 if (found)
1245 fs_info(sdp, "found %u quota changes\n", found);
1246
1247 return 0;
1248
1249 fail:
1250 gfs2_quota_cleanup(sdp);
1251 return error;
1252 }
1253
1254 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1255 {
1256 struct list_head *head = &sdp->sd_quota_list;
1257 struct gfs2_quota_data *qd;
1258 unsigned int x;
1259
1260 spin_lock(&qd_lru_lock);
1261 while (!list_empty(head)) {
1262 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1263
1264 if (atomic_read(&qd->qd_count) > 1 ||
1265 (atomic_read(&qd->qd_count) &&
1266 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1267 list_move(&qd->qd_list, head);
1268 spin_unlock(&qd_lru_lock);
1269 schedule();
1270 spin_lock(&qd_lru_lock);
1271 continue;
1272 }
1273
1274 list_del(&qd->qd_list);
1275 /* Also remove if this qd exists in the reclaim list */
1276 if (!list_empty(&qd->qd_reclaim)) {
1277 list_del_init(&qd->qd_reclaim);
1278 atomic_dec(&qd_lru_count);
1279 }
1280 atomic_dec(&sdp->sd_quota_count);
1281 spin_unlock(&qd_lru_lock);
1282
1283 if (!atomic_read(&qd->qd_count)) {
1284 gfs2_assert_warn(sdp, !qd->qd_change);
1285 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1286 } else
1287 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1288 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1289
1290 gfs2_glock_put(qd->qd_gl);
1291 kmem_cache_free(gfs2_quotad_cachep, qd);
1292
1293 spin_lock(&qd_lru_lock);
1294 }
1295 spin_unlock(&qd_lru_lock);
1296
1297 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1298
1299 if (sdp->sd_quota_bitmap) {
1300 for (x = 0; x < sdp->sd_quota_chunks; x++)
1301 kfree(sdp->sd_quota_bitmap[x]);
1302 kfree(sdp->sd_quota_bitmap);
1303 }
1304 }
1305
1306 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1307 {
1308 if (error == 0 || error == -EROFS)
1309 return;
1310 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1311 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1312 }
1313
1314 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1315 int (*fxn)(struct super_block *sb, int type),
1316 unsigned long t, unsigned long *timeo,
1317 unsigned int *new_timeo)
1318 {
1319 if (t >= *timeo) {
1320 int error = fxn(sdp->sd_vfs, 0);
1321 quotad_error(sdp, msg, error);
1322 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1323 } else {
1324 *timeo -= t;
1325 }
1326 }
1327
1328 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1329 {
1330 struct gfs2_inode *ip;
1331
1332 while(1) {
1333 ip = NULL;
1334 spin_lock(&sdp->sd_trunc_lock);
1335 if (!list_empty(&sdp->sd_trunc_list)) {
1336 ip = list_entry(sdp->sd_trunc_list.next,
1337 struct gfs2_inode, i_trunc_list);
1338 list_del_init(&ip->i_trunc_list);
1339 }
1340 spin_unlock(&sdp->sd_trunc_lock);
1341 if (ip == NULL)
1342 return;
1343 gfs2_glock_finish_truncate(ip);
1344 }
1345 }
1346
1347 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1348 if (!sdp->sd_statfs_force_sync) {
1349 sdp->sd_statfs_force_sync = 1;
1350 wake_up(&sdp->sd_quota_wait);
1351 }
1352 }
1353
1354
1355 /**
1356 * gfs2_quotad - Write cached quota changes into the quota file
1357 * @sdp: Pointer to GFS2 superblock
1358 *
1359 */
1360
1361 int gfs2_quotad(void *data)
1362 {
1363 struct gfs2_sbd *sdp = data;
1364 struct gfs2_tune *tune = &sdp->sd_tune;
1365 unsigned long statfs_timeo = 0;
1366 unsigned long quotad_timeo = 0;
1367 unsigned long t = 0;
1368 DEFINE_WAIT(wait);
1369 int empty;
1370
1371 while (!kthread_should_stop()) {
1372
1373 /* Update the master statfs file */
1374 if (sdp->sd_statfs_force_sync) {
1375 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1376 quotad_error(sdp, "statfs", error);
1377 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1378 }
1379 else
1380 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1381 &statfs_timeo,
1382 &tune->gt_statfs_quantum);
1383
1384 /* Update quota file */
1385 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1386 &quotad_timeo, &tune->gt_quota_quantum);
1387
1388 /* Check for & recover partially truncated inodes */
1389 quotad_check_trunc_list(sdp);
1390
1391 if (freezing(current))
1392 refrigerator();
1393 t = min(quotad_timeo, statfs_timeo);
1394
1395 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1396 spin_lock(&sdp->sd_trunc_lock);
1397 empty = list_empty(&sdp->sd_trunc_list);
1398 spin_unlock(&sdp->sd_trunc_lock);
1399 if (empty && !sdp->sd_statfs_force_sync)
1400 t -= schedule_timeout(t);
1401 else
1402 t = 0;
1403 finish_wait(&sdp->sd_quota_wait, &wait);
1404 }
1405
1406 return 0;
1407 }
1408
1409 static int gfs2_quota_get_xstate(struct super_block *sb,
1410 struct fs_quota_stat *fqs)
1411 {
1412 struct gfs2_sbd *sdp = sb->s_fs_info;
1413
1414 memset(fqs, 0, sizeof(struct fs_quota_stat));
1415 fqs->qs_version = FS_QSTAT_VERSION;
1416 if (sdp->sd_args.ar_quota == GFS2_QUOTA_ON)
1417 fqs->qs_flags = (XFS_QUOTA_UDQ_ENFD | XFS_QUOTA_GDQ_ENFD);
1418 else if (sdp->sd_args.ar_quota == GFS2_QUOTA_ACCOUNT)
1419 fqs->qs_flags = (XFS_QUOTA_UDQ_ACCT | XFS_QUOTA_GDQ_ACCT);
1420 if (sdp->sd_quota_inode) {
1421 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1422 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1423 }
1424 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1425 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1426 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1427 return 0;
1428 }
1429
1430 static int gfs2_xquota_get(struct super_block *sb, int type, qid_t id,
1431 struct fs_disk_quota *fdq)
1432 {
1433 struct gfs2_sbd *sdp = sb->s_fs_info;
1434 struct gfs2_quota_lvb *qlvb;
1435 struct gfs2_quota_data *qd;
1436 struct gfs2_holder q_gh;
1437 int error;
1438
1439 memset(fdq, 0, sizeof(struct fs_disk_quota));
1440
1441 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1442 return -ESRCH; /* Crazy XFS error code */
1443
1444 if (type == USRQUOTA)
1445 type = QUOTA_USER;
1446 else if (type == GRPQUOTA)
1447 type = QUOTA_GROUP;
1448 else
1449 return -EINVAL;
1450
1451 error = qd_get(sdp, type, id, &qd);
1452 if (error)
1453 return error;
1454 error = do_glock(qd, FORCE, &q_gh);
1455 if (error)
1456 goto out;
1457
1458 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1459 fdq->d_version = FS_DQUOT_VERSION;
1460 fdq->d_flags = (type == QUOTA_USER) ? XFS_USER_QUOTA : XFS_GROUP_QUOTA;
1461 fdq->d_id = id;
1462 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit);
1463 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn);
1464 fdq->d_bcount = be64_to_cpu(qlvb->qb_value);
1465
1466 gfs2_glock_dq_uninit(&q_gh);
1467 out:
1468 qd_put(qd);
1469 return error;
1470 }
1471
1472 /* GFS2 only supports a subset of the XFS fields */
1473 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD)
1474
1475 static int gfs2_xquota_set(struct super_block *sb, int type, qid_t id,
1476 struct fs_disk_quota *fdq)
1477 {
1478 struct gfs2_sbd *sdp = sb->s_fs_info;
1479 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1480 struct gfs2_quota_data *qd;
1481 struct gfs2_holder q_gh, i_gh;
1482 unsigned int data_blocks, ind_blocks;
1483 unsigned int blocks = 0;
1484 int alloc_required;
1485 struct gfs2_alloc *al;
1486 loff_t offset;
1487 int error;
1488
1489 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1490 return -ESRCH; /* Crazy XFS error code */
1491
1492 switch(type) {
1493 case USRQUOTA:
1494 type = QUOTA_USER;
1495 if (fdq->d_flags != XFS_USER_QUOTA)
1496 return -EINVAL;
1497 break;
1498 case GRPQUOTA:
1499 type = QUOTA_GROUP;
1500 if (fdq->d_flags != XFS_GROUP_QUOTA)
1501 return -EINVAL;
1502 break;
1503 default:
1504 return -EINVAL;
1505 }
1506
1507 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1508 return -EINVAL;
1509 if (fdq->d_id != id)
1510 return -EINVAL;
1511
1512 error = qd_get(sdp, type, id, &qd);
1513 if (error)
1514 return error;
1515
1516 mutex_lock(&ip->i_inode.i_mutex);
1517 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1518 if (error)
1519 goto out_put;
1520 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1521 if (error)
1522 goto out_q;
1523
1524 /* Check for existing entry, if none then alloc new blocks */
1525 error = update_qd(sdp, qd);
1526 if (error)
1527 goto out_i;
1528
1529 /* If nothing has changed, this is a no-op */
1530 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1531 (fdq->d_blk_softlimit == be64_to_cpu(qd->qd_qb.qb_warn)))
1532 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1533 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1534 (fdq->d_blk_hardlimit == be64_to_cpu(qd->qd_qb.qb_limit)))
1535 fdq->d_fieldmask ^= FS_DQ_BHARD;
1536 if (fdq->d_fieldmask == 0)
1537 goto out_i;
1538
1539 offset = qd2offset(qd);
1540 error = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota),
1541 &alloc_required);
1542 if (error)
1543 goto out_i;
1544 if (alloc_required) {
1545 al = gfs2_alloc_get(ip);
1546 if (al == NULL)
1547 goto out_i;
1548 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1549 &data_blocks, &ind_blocks);
1550 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1551 error = gfs2_inplace_reserve(ip);
1552 if (error)
1553 goto out_alloc;
1554 }
1555
1556 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0);
1557 if (error)
1558 goto out_release;
1559
1560 /* Apply changes */
1561 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1562
1563 gfs2_trans_end(sdp);
1564 out_release:
1565 if (alloc_required) {
1566 gfs2_inplace_release(ip);
1567 out_alloc:
1568 gfs2_alloc_put(ip);
1569 }
1570 out_i:
1571 gfs2_glock_dq_uninit(&i_gh);
1572 out_q:
1573 gfs2_glock_dq_uninit(&q_gh);
1574 out_put:
1575 mutex_unlock(&ip->i_inode.i_mutex);
1576 qd_put(qd);
1577 return error;
1578 }
1579
1580 const struct quotactl_ops gfs2_quotactl_ops = {
1581 .quota_sync = gfs2_quota_sync,
1582 .get_xstate = gfs2_quota_get_xstate,
1583 .get_xquota = gfs2_xquota_get,
1584 .set_xquota = gfs2_xquota_set,
1585 };
1586
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