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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc
[mirror_ubuntu-zesty-kernel.git] / fs / gfs2 / quota.c
CommitLineData
b3b94faa
DT		 1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
0d0868bd 3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
b3b94faa
DT		 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
e9fc2aa0 7 * of the GNU General Public License version 2.
b3b94faa
DT		 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.
1e72c0f7 18 * Since quota tags are part of transactions, there is no need for a quota check
b3b94faa
DT		 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>
1495f230 41#include <linux/mm.h>
b3b94faa
DT		 42#include <linux/spinlock.h>
43#include <linux/completion.h>
44#include <linux/buffer_head.h>
b3b94faa 45#include <linux/sort.h>
18ec7d5c 46#include <linux/fs.h>
2e565bb6 47#include <linux/bio.h>
5c676f6d 48#include <linux/gfs2_ondisk.h>
37b2c837
SW		 49#include <linux/kthread.h>
50#include <linux/freezer.h>
2ec46505 51#include <linux/quota.h>
1d371b5e 52#include <linux/dqblk_xfs.h>
b3b94faa
DT		 53
54#include "gfs2.h"
5c676f6d 55#include "incore.h"
b3b94faa
DT		 56#include "bmap.h"
57#include "glock.h"
58#include "glops.h"
b3b94faa
DT		 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"
18ec7d5c 65#include "inode.h"
5c676f6d 66#include "util.h"
b3b94faa
DT		 67
68#define QUOTA_USER 1
69#define QUOTA_GROUP 0
70
bb8d8a6f
SW		 71struct gfs2_quota_change_host {
72 u64 qc_change;
73 u32 qc_flags; /* GFS2_QCF_... */
74 u32 qc_id;
75};
76
0a7ab79c
AD		 77static LIST_HEAD(qd_lru_list);
78static atomic_t qd_lru_count = ATOMIC_INIT(0);
1328df72 79static DEFINE_SPINLOCK(qd_lru_lock);
0a7ab79c 80
1495f230 81int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc)
0a7ab79c
AD		 82{
83 struct gfs2_quota_data *qd;
84 struct gfs2_sbd *sdp;
1495f230 85 int nr_to_scan = sc->nr_to_scan;
0a7ab79c 86
1495f230 87 if (nr_to_scan == 0)
0a7ab79c
AD		 88 goto out;
89
1495f230 90 if (!(sc->gfp_mask & __GFP_FS))
0a7ab79c
AD		 91 return -1;
92
93 spin_lock(&qd_lru_lock);
1495f230 94 while (nr_to_scan && !list_empty(&qd_lru_list)) {
0a7ab79c
AD		 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
0a7ab79c
AD		 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
f057f6cd 106 gfs2_glock_put(qd->qd_gl);
0a7ab79c
AD		 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);
1495f230 115 nr_to_scan--;
0a7ab79c
AD		 116 }
117 spin_unlock(&qd_lru_lock);
118
119out:
120 return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
121}
122
cd915493 123static u64 qd2offset(struct gfs2_quota_data *qd)
b3b94faa 124{
cd915493 125 u64 offset;
b3b94faa 126
cd915493 127 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
b3b94faa
DT		 128 offset *= sizeof(struct gfs2_quota);
129
130 return offset;
131}
132
cd915493 133static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
b3b94faa
DT		 134 struct gfs2_quota_data **qdp)
135{
136 struct gfs2_quota_data *qd;
137 int error;
138
37b2c837 139 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
b3b94faa
DT		 140 if (!qd)
141 return -ENOMEM;
142
0a7ab79c 143 atomic_set(&qd->qd_count, 1);
b3b94faa
DT		 144 qd->qd_id = id;
145 if (user)
146 set_bit(QDF_USER, &qd->qd_flags);
147 qd->qd_slot = -1;
0a7ab79c 148 INIT_LIST_HEAD(&qd->qd_reclaim);
b3b94faa 149
cd915493 150 error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
b3b94faa
DT		 151 &gfs2_quota_glops, CREATE, &qd->qd_gl);
152 if (error)
153 goto fail;
154
b3b94faa
DT		 155 *qdp = qd;
156
157 return 0;
158
a91ea69f 159fail:
37b2c837 160 kmem_cache_free(gfs2_quotad_cachep, qd);
b3b94faa
DT		 161 return error;
162}
163
6a6ada81 164static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
b3b94faa
DT		 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;
0a7ab79c 174 spin_lock(&qd_lru_lock);
b3b94faa
DT		 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) {
0a7ab79c
AD		 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);
b3b94faa
DT		 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
0a7ab79c 200 spin_unlock(&qd_lru_lock);
b3b94faa 201
6a6ada81 202 if (qd) {
b3b94faa 203 if (new_qd) {
f057f6cd 204 gfs2_glock_put(new_qd->qd_gl);
37b2c837 205 kmem_cache_free(gfs2_quotad_cachep, new_qd);
b3b94faa
DT		 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
217static void qd_hold(struct gfs2_quota_data *qd)
218{
219 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
0a7ab79c
AD		 220 gfs2_assert(sdp, atomic_read(&qd->qd_count));
221 atomic_inc(&qd->qd_count);
b3b94faa
DT		 222}
223
224static void qd_put(struct gfs2_quota_data *qd)
225{
0a7ab79c
AD		 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 }
b3b94faa
DT		 232}
233
234static 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
22077f57 240 spin_lock(&qd_lru_lock);
b3b94faa
DT		 241
242 if (qd->qd_slot_count++) {
22077f57 243 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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
a91ea69f 256found:
b3b94faa
DT		 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
22077f57 267 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 268
269 return 0;
270
a91ea69f 271fail:
b3b94faa 272 qd->qd_slot_count--;
22077f57 273 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 274 return -ENOSPC;
275}
276
277static void slot_hold(struct gfs2_quota_data *qd)
278{
279 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
280
22077f57 281 spin_lock(&qd_lru_lock);
b3b94faa
DT		 282 gfs2_assert(sdp, qd->qd_slot_count);
283 qd->qd_slot_count++;
22077f57 284 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 285}
286
287static void slot_put(struct gfs2_quota_data *qd)
288{
289 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
290
22077f57 291 spin_lock(&qd_lru_lock);
b3b94faa
DT		 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 }
22077f57 297 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 298}
299
300static int bh_get(struct gfs2_quota_data *qd)
301{
302 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
feaa7bba 303 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
b3b94faa 304 unsigned int block, offset;
b3b94faa
DT		 305 struct buffer_head *bh;
306 int error;
23591256 307 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
b3b94faa 308
f55ab26a 309 mutex_lock(&sdp->sd_quota_mutex);
b3b94faa
DT		 310
311 if (qd->qd_bh_count++) {
f55ab26a 312 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 313 return 0;
314 }
315
316 block = qd->qd_slot / sdp->sd_qc_per_block;
0d0868bd 317 offset = qd->qd_slot % sdp->sd_qc_per_block;
b3b94faa 318
23591256 319 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
e9e1ef2b 320 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
b3b94faa
DT		 321 if (error)
322 goto fail;
7276b3b0 323 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
b3b94faa
DT		 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
2e95b665 335 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 336
337 return 0;
338
a91ea69f 339fail_brelse:
b3b94faa 340 brelse(bh);
a91ea69f 341fail:
b3b94faa 342 qd->qd_bh_count--;
f55ab26a 343 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 344 return error;
345}
346
347static void bh_put(struct gfs2_quota_data *qd)
348{
349 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
350
f55ab26a 351 mutex_lock(&sdp->sd_quota_mutex);
b3b94faa
DT		 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 }
f55ab26a 358 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 359}
360
361static 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
0a7ab79c 372 spin_lock(&qd_lru_lock);
b3b94faa
DT		 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);
0a7ab79c
AD		 383 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
384 atomic_inc(&qd->qd_count);
b3b94faa
DT		 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
0a7ab79c 396 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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
414static 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
0a7ab79c 421 spin_lock(&qd_lru_lock);
b3b94faa
DT		 422
423 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
424 !test_bit(QDF_CHANGE, &qd->qd_flags)) {
0a7ab79c 425 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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);
0a7ab79c
AD		 432 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
433 atomic_inc(&qd->qd_count);
b3b94faa
DT		 434 qd->qd_change_sync = qd->qd_change;
435 gfs2_assert_warn(sdp, qd->qd_slot_count);
436 qd->qd_slot_count++;
437
0a7ab79c 438 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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
451static void qd_unlock(struct gfs2_quota_data *qd)
452{
568f4c96
SW		 453 gfs2_assert_warn(qd->qd_gl->gl_sbd,
454 test_bit(QDF_LOCKED, &qd->qd_flags));
b3b94faa
DT		 455 clear_bit(QDF_LOCKED, &qd->qd_flags);
456 bh_put(qd);
457 slot_put(qd);
458 qd_put(qd);
459}
460
33a82529 461static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
b3b94faa
DT		 462 struct gfs2_quota_data **qdp)
463{
464 int error;
465
6a6ada81 466 error = qd_get(sdp, user, id, qdp);
b3b94faa
DT		 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
a91ea69f 480fail_slot:
b3b94faa 481 slot_put(*qdp);
a91ea69f 482fail:
b3b94faa
DT		 483 qd_put(*qdp);
484 return error;
485}
486
487static void qdsb_put(struct gfs2_quota_data *qd)
488{
489 bh_put(qd);
490 slot_put(qd);
491 qd_put(qd);
492}
493
cd915493 494int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
b3b94faa 495{
feaa7bba 496 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
6dbd8224 497 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa
DT		 498 struct gfs2_quota_data **qd = al->al_qd;
499 int error;
500
501 if (gfs2_assert_warn(sdp, !al->al_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
33a82529 508 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
b3b94faa
DT		 509 if (error)
510 goto out;
511 al->al_qd_num++;
512 qd++;
513
33a82529 514 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
b3b94faa
DT		 515 if (error)
516 goto out;
517 al->al_qd_num++;
518 qd++;
519
2933f925 520 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
33a82529 521 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
b3b94faa
DT		 522 if (error)
523 goto out;
524 al->al_qd_num++;
525 qd++;
526 }
527
2933f925 528 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
33a82529 529 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
b3b94faa
DT		 530 if (error)
531 goto out;
532 al->al_qd_num++;
533 qd++;
534 }
535
a91ea69f 536out:
b3b94faa
DT		 537 if (error)
538 gfs2_quota_unhold(ip);
b3b94faa
DT		 539 return error;
540}
541
542void gfs2_quota_unhold(struct gfs2_inode *ip)
543{
feaa7bba 544 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
6dbd8224 545 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa
DT		 546 unsigned int x;
547
548 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
549
550 for (x = 0; x < al->al_qd_num; x++) {
551 qdsb_put(al->al_qd[x]);
552 al->al_qd[x] = NULL;
553 }
554 al->al_qd_num = 0;
555}
556
557static int sort_qd(const void *a, const void *b)
558{
48fac179
SW		 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;
b3b94faa
DT		 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))
48fac179 565 return -1;
b3b94faa 566 else
48fac179 567 return 1;
b3b94faa 568 }
48fac179
SW		 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;
b3b94faa 573
48fac179 574 return 0;
b3b94faa
DT		 575}
576
cd915493 577static void do_qc(struct gfs2_quota_data *qd, s64 change)
b3b94faa
DT		 578{
579 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
feaa7bba 580 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
b3b94faa 581 struct gfs2_quota_change *qc = qd->qd_bh_qc;
cd915493 582 s64 x;
b3b94faa 583
f55ab26a 584 mutex_lock(&sdp->sd_quota_mutex);
d4e9c4c3 585 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
b3b94faa
DT		 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
b44b84d7 595 x = be64_to_cpu(qc->qc_change) + change;
b3b94faa
DT		 596 qc->qc_change = cpu_to_be64(x);
597
22077f57 598 spin_lock(&qd_lru_lock);
b3b94faa 599 qd->qd_change = x;
22077f57 600 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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 }
907b9bce 613
f55ab26a 614 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 615}
616
18ec7d5c 617/**
1e72c0f7
SW		 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
e285c100 621 * @change: The amount of usage change to record
1e72c0f7 622 * @qd: The quota data
e285c100 623 * @fdq: The updated limits to record
18ec7d5c
SW		 624 *
625 * This function was mostly borrowed from gfs2_block_truncate_page which was
626 * in turn mostly borrowed from ext3
1e72c0f7
SW		 627 *
628 * Returns: 0 or -ve on error
18ec7d5c 629 */
1e72c0f7 630
18ec7d5c 631static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
e285c100
SW		 632 s64 change, struct gfs2_quota_data *qd,
633 struct fs_disk_quota *fdq)
18ec7d5c 634{
feaa7bba 635 struct inode *inode = &ip->i_inode;
14870b45 636 struct gfs2_sbd *sdp = GFS2_SB(inode);
18ec7d5c
SW		 637 struct address_space *mapping = inode->i_mapping;
638 unsigned long index = loc >> PAGE_CACHE_SHIFT;
1990e917 639 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
18ec7d5c 640 unsigned blocksize, iblock, pos;
ab9bbda0 641 struct buffer_head *bh;
18ec7d5c 642 struct page *page;
7e619bc3
AD		 643 void *kaddr, *ptr;
644 struct gfs2_quota q, *qp;
645 int err, nbytes;
e285c100 646 u64 size;
18ec7d5c 647
891a8e93
SW		 648 if (gfs2_is_stuffed(ip)) {
649 err = gfs2_unstuff_dinode(ip, NULL);
650 if (err)
651 return err;
652 }
7e619bc3
AD		 653
654 memset(&q, 0, sizeof(struct gfs2_quota));
655 err = gfs2_internal_read(ip, NULL, (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) {
14870b45 667 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
7e619bc3
AD		 668 qd->qd_qb.qb_warn = qp->qu_warn;
669 }
670 if (fdq->d_fieldmask & FS_DQ_BHARD) {
14870b45 671 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
7e619bc3
AD		 672 qd->qd_qb.qb_limit = qp->qu_limit;
673 }
802ec9b6
AD		 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 }
7e619bc3
AD		 678 }
679
680 /* Write the quota into the quota file on disk */
681 ptr = qp;
682 nbytes = sizeof(struct gfs2_quota);
683get_a_page:
18ec7d5c
SW		 684 page = grab_cache_page(mapping, index);
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)) {
e9e1ef2b 703 gfs2_block_map(inode, iblock, bh, 1);
18ec7d5c 704 if (!buffer_mapped(bh))
7e619bc3
AD		 705 goto unlock_out;
706 /* If it's a newly allocated disk block for quota, zero it */
8b421601
AD		 707 if (buffer_new(bh))
708 zero_user(page, pos - blocksize, bh->b_size);
18ec7d5c
SW		 709 }
710
711 if (PageUptodate(page))
712 set_buffer_uptodate(bh);
713
714 if (!buffer_uptodate(bh)) {
65299a3b 715 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &bh);
18ec7d5c
SW		 716 wait_on_buffer(bh);
717 if (!buffer_uptodate(bh))
7e619bc3 718 goto unlock_out;
18ec7d5c
SW		 719 }
720
721 gfs2_trans_add_bh(ip->i_gl, bh, 0);
722
723 kaddr = kmap_atomic(page, KM_USER0);
7e619bc3
AD		 724 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
725 nbytes = PAGE_CACHE_SIZE - offset;
726 memcpy(kaddr + offset, ptr, nbytes);
18ec7d5c
SW		 727 flush_dcache_page(page);
728 kunmap_atomic(kaddr, KM_USER0);
7e619bc3
AD		 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 */
8b421601 734 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
7e619bc3
AD		 735 ptr = ptr + nbytes;
736 nbytes = sizeof(struct gfs2_quota) - nbytes;
737 offset = 0;
738 index++;
739 goto get_a_page;
740 }
e285c100 741
e285c100 742 size = loc + sizeof(struct gfs2_quota);
a2e0f799 743 if (size > inode->i_size)
e285c100 744 i_size_write(inode, size);
e285c100 745 inode->i_mtime = inode->i_atime = CURRENT_TIME;
e285c100 746 mark_inode_dirty(inode);
7e619bc3 747 return err;
ab9bbda0 748
7e619bc3 749unlock_out:
18ec7d5c
SW		 750 unlock_page(page);
751 page_cache_release(page);
752 return err;
753}
754
b3b94faa
DT		 755static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
756{
757 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
feaa7bba 758 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
b3b94faa
DT		 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;
f42faf4f 763 loff_t offset;
20b95bf2 764 unsigned int nalloc = 0, blocks;
b3b94faa
DT		 765 struct gfs2_alloc *al = NULL;
766 int error;
767
768 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
769 &data_blocks, &ind_blocks);
770
16c5f06f 771 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
b3b94faa
DT		 772 if (!ghs)
773 return -ENOMEM;
774
775 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
e285c100 776 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
b3b94faa 777 for (qx = 0; qx < num_qd; qx++) {
1e72c0f7 778 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
b3b94faa
DT		 779 GL_NOCACHE, &ghs[qx]);
780 if (error)
781 goto out;
782 }
783
784 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
785 if (error)
786 goto out;
787
788 for (x = 0; x < num_qd; x++) {
b3b94faa 789 offset = qd2offset(qda[x]);
461cb419
BP		 790 if (gfs2_write_alloc_required(ip, offset,
791 sizeof(struct gfs2_quota)))
b3b94faa
DT		 792 nalloc++;
793 }
794
20b95bf2
AD		 795 al = gfs2_alloc_get(ip);
796 if (!al) {
797 error = -ENOMEM;
798 goto out_gunlock;
799 }
800 /*
801 * 1 blk for unstuffing inode if stuffed. We add this extra
802 * block to the reservation unconditionally. If the inode
803 * doesn't need unstuffing, the block will be released to the
804 * rgrp since it won't be allocated during the transaction
805 */
806 al->al_requested = 1;
7e619bc3
AD		 807 /* +3 in the end for unstuffing block, inode size update block
808 * and another block in case quota straddles page boundary and
809 * two blocks need to be updated instead of 1 */
810 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
b3b94faa 811
20b95bf2
AD		 812 if (nalloc)
813 al->al_requested += nalloc * (data_blocks + ind_blocks);
814 error = gfs2_inplace_reserve(ip);
815 if (error)
816 goto out_alloc;
b3b94faa 817
20b95bf2 818 if (nalloc)
54335b1f 819 blocks += gfs2_rg_blocks(ip) + nalloc * ind_blocks + RES_STATFS;
20b95bf2
AD		 820
821 error = gfs2_trans_begin(sdp, blocks, 0);
822 if (error)
823 goto out_ipres;
b3b94faa
DT		 824
825 for (x = 0; x < num_qd; x++) {
b3b94faa
DT		 826 qd = qda[x];
827 offset = qd2offset(qd);
e285c100 828 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
18ec7d5c 829 if (error)
b3b94faa 830 goto out_end_trans;
b3b94faa
DT		 831
832 do_qc(qd, -qd->qd_change_sync);
662e3a55 833 set_bit(QDF_REFRESH, &qd->qd_flags);
b3b94faa
DT		 834 }
835
836 error = 0;
837
a91ea69f 838out_end_trans:
b3b94faa 839 gfs2_trans_end(sdp);
a91ea69f 840out_ipres:
20b95bf2 841 gfs2_inplace_release(ip);
a91ea69f 842out_alloc:
20b95bf2 843 gfs2_alloc_put(ip);
a91ea69f 844out_gunlock:
b3b94faa 845 gfs2_glock_dq_uninit(&i_gh);
a91ea69f 846out:
b3b94faa
DT		 847 while (qx--)
848 gfs2_glock_dq_uninit(&ghs[qx]);
e285c100 849 mutex_unlock(&ip->i_inode.i_mutex);
b3b94faa 850 kfree(ghs);
b09e593d 851 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
b3b94faa
DT		 852 return error;
853}
854
e285c100
SW		 855static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
856{
857 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
858 struct gfs2_quota q;
859 struct gfs2_quota_lvb *qlvb;
860 loff_t pos;
861 int error;
862
863 memset(&q, 0, sizeof(struct gfs2_quota));
864 pos = qd2offset(qd);
865 error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q));
866 if (error < 0)
867 return error;
868
869 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
870 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
871 qlvb->__pad = 0;
872 qlvb->qb_limit = q.qu_limit;
873 qlvb->qb_warn = q.qu_warn;
874 qlvb->qb_value = q.qu_value;
875 qd->qd_qb = *qlvb;
876
877 return 0;
878}
879
b3b94faa
DT		 880static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
881 struct gfs2_holder *q_gh)
882{
883 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
feaa7bba 884 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
b3b94faa 885 struct gfs2_holder i_gh;
b3b94faa
DT		 886 int error;
887
a91ea69f 888restart:
b3b94faa
DT		 889 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
890 if (error)
891 return error;
892
e9fc2aa0 893 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
b3b94faa 894
e9fc2aa0 895 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
b3b94faa 896 gfs2_glock_dq_uninit(q_gh);
91094d0f
SW		 897 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
898 GL_NOCACHE, q_gh);
b3b94faa
DT		 899 if (error)
900 return error;
901
e9fc2aa0 902 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
b3b94faa
DT		 903 if (error)
904 goto fail;
905
e285c100
SW		 906 error = update_qd(sdp, qd);
907 if (error)
1e72c0f7 908 goto fail_gunlock;
b3b94faa 909
e285c100 910 gfs2_glock_dq_uninit(&i_gh);
91094d0f
SW		 911 gfs2_glock_dq_uninit(q_gh);
912 force_refresh = 0;
913 goto restart;
b3b94faa
DT		 914 }
915
916 return 0;
917
a91ea69f 918fail_gunlock:
b3b94faa 919 gfs2_glock_dq_uninit(&i_gh);
a91ea69f 920fail:
b3b94faa 921 gfs2_glock_dq_uninit(q_gh);
b3b94faa
DT		 922 return error;
923}
924
cd915493 925int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
b3b94faa 926{
feaa7bba 927 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
6dbd8224 928 struct gfs2_alloc *al = ip->i_alloc;
662e3a55 929 struct gfs2_quota_data *qd;
b3b94faa
DT		 930 unsigned int x;
931 int error = 0;
932
891a8e93
SW		 933 error = gfs2_quota_hold(ip, uid, gid);
934 if (error)
935 return error;
b3b94faa
DT		 936
937 if (capable(CAP_SYS_RESOURCE) ||
938 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
939 return 0;
940
941 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
942 sort_qd, NULL);
943
944 for (x = 0; x < al->al_qd_num; x++) {
662e3a55
AD		 945 int force = NO_FORCE;
946 qd = al->al_qd[x];
947 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
948 force = FORCE;
949 error = do_glock(qd, force, &al->al_qd_ghs[x]);
b3b94faa
DT		 950 if (error)
951 break;
952 }
953
954 if (!error)
955 set_bit(GIF_QD_LOCKED, &ip->i_flags);
956 else {
957 while (x--)
958 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
959 gfs2_quota_unhold(ip);
960 }
961
962 return error;
963}
964
965static int need_sync(struct gfs2_quota_data *qd)
966{
967 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
968 struct gfs2_tune *gt = &sdp->sd_tune;
cd915493 969 s64 value;
b3b94faa
DT		 970 unsigned int num, den;
971 int do_sync = 1;
972
973 if (!qd->qd_qb.qb_limit)
974 return 0;
975
22077f57 976 spin_lock(&qd_lru_lock);
b3b94faa 977 value = qd->qd_change;
22077f57 978 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 979
980 spin_lock(&gt->gt_spin);
981 num = gt->gt_quota_scale_num;
982 den = gt->gt_quota_scale_den;
983 spin_unlock(&gt->gt_spin);
984
985 if (value < 0)
986 do_sync = 0;
e9fc2aa0
SW		 987 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
988 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
b3b94faa
DT		 989 do_sync = 0;
990 else {
991 value *= gfs2_jindex_size(sdp) * num;
4abaca17 992 value = div_s64(value, den);
e9fc2aa0 993 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
cd915493 994 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
b3b94faa
DT		 995 do_sync = 0;
996 }
997
998 return do_sync;
999}
1000
1001void gfs2_quota_unlock(struct gfs2_inode *ip)
1002{
6dbd8224 1003 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa
DT		 1004 struct gfs2_quota_data *qda[4];
1005 unsigned int count = 0;
1006 unsigned int x;
1007
1008 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1009 goto out;
1010
1011 for (x = 0; x < al->al_qd_num; x++) {
1012 struct gfs2_quota_data *qd;
1013 int sync;
1014
1015 qd = al->al_qd[x];
1016 sync = need_sync(qd);
1017
1018 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
1019
1020 if (sync && qd_trylock(qd))
1021 qda[count++] = qd;
1022 }
1023
1024 if (count) {
1025 do_sync(count, qda);
1026 for (x = 0; x < count; x++)
1027 qd_unlock(qda[x]);
1028 }
1029
a91ea69f 1030out:
b3b94faa
DT		 1031 gfs2_quota_unhold(ip);
1032}
1033
1034#define MAX_LINE 256
1035
1036static int print_message(struct gfs2_quota_data *qd, char *type)
1037{
1038 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
b3b94faa 1039
2ec46505 1040 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
02630a12
SW		 1041 sdp->sd_fsname, type,
1042 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1043 qd->qd_id);
b3b94faa
DT		 1044
1045 return 0;
1046}
1047
cd915493 1048int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
b3b94faa 1049{
feaa7bba 1050 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
6dbd8224 1051 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa 1052 struct gfs2_quota_data *qd;
cd915493 1053 s64 value;
b3b94faa
DT		 1054 unsigned int x;
1055 int error = 0;
1056
1057 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1058 return 0;
1059
1060 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1061 return 0;
1062
1063 for (x = 0; x < al->al_qd_num; x++) {
1064 qd = al->al_qd[x];
1065
1066 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1067 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
1068 continue;
1069
e9fc2aa0 1070 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
22077f57 1071 spin_lock(&qd_lru_lock);
b3b94faa 1072 value += qd->qd_change;
22077f57 1073 spin_unlock(&qd_lru_lock);
b3b94faa 1074
cd915493 1075 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
b3b94faa 1076 print_message(qd, "exceeded");
2ec46505
SW		 1077 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1078 USRQUOTA : GRPQUOTA, qd->qd_id,
1079 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1080
b3b94faa
DT		 1081 error = -EDQUOT;
1082 break;
e9fc2aa0 1083 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
cd915493 1084 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
b3b94faa 1085 time_after_eq(jiffies, qd->qd_last_warn +
568f4c96
SW		 1086 gfs2_tune_get(sdp,
1087 gt_quota_warn_period) * HZ)) {
2ec46505
SW		 1088 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ?
1089 USRQUOTA : GRPQUOTA, qd->qd_id,
1090 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
b3b94faa
DT		 1091 error = print_message(qd, "warning");
1092 qd->qd_last_warn = jiffies;
1093 }
1094 }
1095
1096 return error;
1097}
1098
cd915493
SW		 1099void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1100 u32 uid, u32 gid)
b3b94faa 1101{
6dbd8224 1102 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa
DT		 1103 struct gfs2_quota_data *qd;
1104 unsigned int x;
b3b94faa 1105
feaa7bba 1106 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
b3b94faa 1107 return;
383f01fb 1108 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
b3b94faa
DT		 1109 return;
1110
1111 for (x = 0; x < al->al_qd_num; x++) {
1112 qd = al->al_qd[x];
1113
1114 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1115 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1116 do_qc(qd, change);
b3b94faa
DT		 1117 }
1118 }
1119}
1120
5fb324ad 1121int gfs2_quota_sync(struct super_block *sb, int type, int wait)
b3b94faa 1122{
8c42d637 1123 struct gfs2_sbd *sdp = sb->s_fs_info;
b3b94faa
DT		 1124 struct gfs2_quota_data **qda;
1125 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1126 unsigned int num_qd;
1127 unsigned int x;
1128 int error = 0;
1129
1130 sdp->sd_quota_sync_gen++;
1131
1132 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1133 if (!qda)
1134 return -ENOMEM;
1135
1136 do {
1137 num_qd = 0;
1138
1139 for (;;) {
1140 error = qd_fish(sdp, qda + num_qd);
1141 if (error || !qda[num_qd])
1142 break;
1143 if (++num_qd == max_qd)
1144 break;
1145 }
1146
1147 if (num_qd) {
1148 if (!error)
1149 error = do_sync(num_qd, qda);
1150 if (!error)
1151 for (x = 0; x < num_qd; x++)
1152 qda[x]->qd_sync_gen =
1153 sdp->sd_quota_sync_gen;
1154
1155 for (x = 0; x < num_qd; x++)
1156 qd_unlock(qda[x]);
1157 }
1158 } while (!error && num_qd == max_qd);
1159
1160 kfree(qda);
1161
1162 return error;
1163}
1164
5fb324ad
CH		 1165static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1166{
1167 return gfs2_quota_sync(sb, type, 0);
1168}
1169
cd915493 1170int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
b3b94faa
DT		 1171{
1172 struct gfs2_quota_data *qd;
1173 struct gfs2_holder q_gh;
1174 int error;
1175
6a6ada81 1176 error = qd_get(sdp, user, id, &qd);
b3b94faa
DT		 1177 if (error)
1178 return error;
1179
1180 error = do_glock(qd, FORCE, &q_gh);
1181 if (!error)
1182 gfs2_glock_dq_uninit(&q_gh);
1183
1184 qd_put(qd);
b3b94faa
DT		 1185 return error;
1186}
1187
bb8d8a6f
SW		 1188static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1189{
1190 const struct gfs2_quota_change *str = buf;
1191
1192 qc->qc_change = be64_to_cpu(str->qc_change);
1193 qc->qc_flags = be32_to_cpu(str->qc_flags);
1194 qc->qc_id = be32_to_cpu(str->qc_id);
1195}
1196
b3b94faa
DT		 1197int gfs2_quota_init(struct gfs2_sbd *sdp)
1198{
feaa7bba 1199 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
a2e0f799
SW		 1200 u64 size = i_size_read(sdp->sd_qc_inode);
1201 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
b3b94faa
DT		 1202 unsigned int x, slot = 0;
1203 unsigned int found = 0;
cd915493
SW		 1204 u64 dblock;
1205 u32 extlen = 0;
b3b94faa
DT		 1206 int error;
1207
a2e0f799 1208 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
907b9bce 1209 return -EIO;
a2e0f799 1210
b3b94faa 1211 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
5c676f6d 1212 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
b3b94faa
DT		 1213
1214 error = -ENOMEM;
1215
1216 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
16c5f06f 1217 sizeof(unsigned char *), GFP_NOFS);
b3b94faa
DT		 1218 if (!sdp->sd_quota_bitmap)
1219 return error;
1220
1221 for (x = 0; x < sdp->sd_quota_chunks; x++) {
16c5f06f 1222 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
b3b94faa
DT		 1223 if (!sdp->sd_quota_bitmap[x])
1224 goto fail;
1225 }
1226
1227 for (x = 0; x < blocks; x++) {
1228 struct buffer_head *bh;
1229 unsigned int y;
1230
1231 if (!extlen) {
1232 int new = 0;
feaa7bba 1233 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
b3b94faa
DT		 1234 if (error)
1235 goto fail;
1236 }
b3b94faa 1237 error = -EIO;
7276b3b0
SW		 1238 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1239 if (!bh)
1240 goto fail;
b3b94faa
DT		 1241 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1242 brelse(bh);
1243 goto fail;
1244 }
1245
7276b3b0 1246 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
b3b94faa 1247 y++, slot++) {
b62f963e 1248 struct gfs2_quota_change_host qc;
b3b94faa
DT		 1249 struct gfs2_quota_data *qd;
1250
1251 gfs2_quota_change_in(&qc, bh->b_data +
1252 sizeof(struct gfs2_meta_header) +
1253 y * sizeof(struct gfs2_quota_change));
1254 if (!qc.qc_change)
1255 continue;
1256
1257 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1258 qc.qc_id, &qd);
1259 if (error) {
1260 brelse(bh);
1261 goto fail;
1262 }
1263
1264 set_bit(QDF_CHANGE, &qd->qd_flags);
1265 qd->qd_change = qc.qc_change;
1266 qd->qd_slot = slot;
1267 qd->qd_slot_count = 1;
b3b94faa 1268
0a7ab79c 1269 spin_lock(&qd_lru_lock);
b3b94faa
DT		 1270 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1271 list_add(&qd->qd_list, &sdp->sd_quota_list);
1272 atomic_inc(&sdp->sd_quota_count);
0a7ab79c 1273 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 1274
1275 found++;
1276 }
1277
1278 brelse(bh);
1279 dblock++;
1280 extlen--;
1281 }
1282
1283 if (found)
1284 fs_info(sdp, "found %u quota changes\n", found);
1285
1286 return 0;
1287
a91ea69f 1288fail:
b3b94faa
DT		 1289 gfs2_quota_cleanup(sdp);
1290 return error;
1291}
1292
b3b94faa
DT		 1293void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1294{
1295 struct list_head *head = &sdp->sd_quota_list;
1296 struct gfs2_quota_data *qd;
1297 unsigned int x;
1298
0a7ab79c 1299 spin_lock(&qd_lru_lock);
b3b94faa
DT		 1300 while (!list_empty(head)) {
1301 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1302
0a7ab79c
AD		 1303 if (atomic_read(&qd->qd_count) > 1 ||
1304 (atomic_read(&qd->qd_count) &&
1305 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
0a7ab79c
AD		 1306 list_move(&qd->qd_list, head);
1307 spin_unlock(&qd_lru_lock);
b3b94faa 1308 schedule();
0a7ab79c 1309 spin_lock(&qd_lru_lock);
b3b94faa
DT		 1310 continue;
1311 }
1312
1313 list_del(&qd->qd_list);
0a7ab79c
AD		 1314 /* Also remove if this qd exists in the reclaim list */
1315 if (!list_empty(&qd->qd_reclaim)) {
1316 list_del_init(&qd->qd_reclaim);
1317 atomic_dec(&qd_lru_count);
1318 }
b3b94faa 1319 atomic_dec(&sdp->sd_quota_count);
0a7ab79c 1320 spin_unlock(&qd_lru_lock);
b3b94faa 1321
0a7ab79c 1322 if (!atomic_read(&qd->qd_count)) {
b3b94faa
DT		 1323 gfs2_assert_warn(sdp, !qd->qd_change);
1324 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1325 } else
1326 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1327 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1328
f057f6cd 1329 gfs2_glock_put(qd->qd_gl);
37b2c837 1330 kmem_cache_free(gfs2_quotad_cachep, qd);
b3b94faa 1331
0a7ab79c 1332 spin_lock(&qd_lru_lock);
b3b94faa 1333 }
0a7ab79c 1334 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 1335
1336 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1337
1338 if (sdp->sd_quota_bitmap) {
1339 for (x = 0; x < sdp->sd_quota_chunks; x++)
1340 kfree(sdp->sd_quota_bitmap[x]);
1341 kfree(sdp->sd_quota_bitmap);
1342 }
1343}
1344
37b2c837
SW		 1345static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1346{
1347 if (error == 0 || error == -EROFS)
1348 return;
1349 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1350 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1351}
1352
1353static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
8c42d637 1354 int (*fxn)(struct super_block *sb, int type),
37b2c837
SW		 1355 unsigned long t, unsigned long *timeo,
1356 unsigned int *new_timeo)
1357{
1358 if (t >= *timeo) {
8c42d637 1359 int error = fxn(sdp->sd_vfs, 0);
37b2c837
SW		 1360 quotad_error(sdp, msg, error);
1361 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1362 } else {
1363 *timeo -= t;
1364 }
1365}
1366
813e0c46
SW		 1367static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1368{
1369 struct gfs2_inode *ip;
1370
1371 while(1) {
1372 ip = NULL;
1373 spin_lock(&sdp->sd_trunc_lock);
1374 if (!list_empty(&sdp->sd_trunc_list)) {
1375 ip = list_entry(sdp->sd_trunc_list.next,
1376 struct gfs2_inode, i_trunc_list);
1377 list_del_init(&ip->i_trunc_list);
1378 }
1379 spin_unlock(&sdp->sd_trunc_lock);
1380 if (ip == NULL)
1381 return;
1382 gfs2_glock_finish_truncate(ip);
1383 }
1384}
1385
3d3c10f2
BM		 1386void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1387 if (!sdp->sd_statfs_force_sync) {
1388 sdp->sd_statfs_force_sync = 1;
1389 wake_up(&sdp->sd_quota_wait);
1390 }
1391}
1392
1393
37b2c837
SW		 1394/**
1395 * gfs2_quotad - Write cached quota changes into the quota file
1396 * @sdp: Pointer to GFS2 superblock
1397 *
1398 */
1399
1400int gfs2_quotad(void *data)
1401{
1402 struct gfs2_sbd *sdp = data;
1403 struct gfs2_tune *tune = &sdp->sd_tune;
1404 unsigned long statfs_timeo = 0;
1405 unsigned long quotad_timeo = 0;
1406 unsigned long t = 0;
1407 DEFINE_WAIT(wait);
813e0c46 1408 int empty;
37b2c837
SW		 1409
1410 while (!kthread_should_stop()) {
1411
1412 /* Update the master statfs file */
3d3c10f2
BM		 1413 if (sdp->sd_statfs_force_sync) {
1414 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1415 quotad_error(sdp, "statfs", error);
1416 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1417 }
1418 else
1419 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1420 &statfs_timeo,
1421 &tune->gt_statfs_quantum);
37b2c837
SW		 1422
1423 /* Update quota file */
5fb324ad 1424 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
37b2c837
SW		 1425 &quotad_timeo, &tune->gt_quota_quantum);
1426
813e0c46
SW		 1427 /* Check for & recover partially truncated inodes */
1428 quotad_check_trunc_list(sdp);
1429
37b2c837
SW		 1430 if (freezing(current))
1431 refrigerator();
1432 t = min(quotad_timeo, statfs_timeo);
1433
7fa5d20d 1434 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
813e0c46
SW		 1435 spin_lock(&sdp->sd_trunc_lock);
1436 empty = list_empty(&sdp->sd_trunc_list);
1437 spin_unlock(&sdp->sd_trunc_lock);
3d3c10f2 1438 if (empty && !sdp->sd_statfs_force_sync)
813e0c46
SW		 1439 t -= schedule_timeout(t);
1440 else
1441 t = 0;
37b2c837
SW		 1442 finish_wait(&sdp->sd_quota_wait, &wait);
1443 }
1444
1445 return 0;
1446}
1447
1d371b5e
SW		 1448static int gfs2_quota_get_xstate(struct super_block *sb,
1449 struct fs_quota_stat *fqs)
1450{
1451 struct gfs2_sbd *sdp = sb->s_fs_info;
1452
1453 memset(fqs, 0, sizeof(struct fs_quota_stat));
1454 fqs->qs_version = FS_QSTAT_VERSION;
ad6bb90f
CH		 1455
1456 switch (sdp->sd_args.ar_quota) {
1457 case GFS2_QUOTA_ON:
ade7ce31 1458 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
ad6bb90f
CH		 1459 /*FALLTHRU*/
1460 case GFS2_QUOTA_ACCOUNT:
ade7ce31 1461 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
ad6bb90f
CH		 1462 break;
1463 case GFS2_QUOTA_OFF:
1464 break;
1465 }
1466
1d371b5e
SW		 1467 if (sdp->sd_quota_inode) {
1468 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1469 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1470 }
1471 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1472 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1473 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1474 return 0;
1475}
1476
b9b2dd36
CH		 1477static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id,
1478 struct fs_disk_quota *fdq)
113d6b3c
SW		 1479{
1480 struct gfs2_sbd *sdp = sb->s_fs_info;
1481 struct gfs2_quota_lvb *qlvb;
1482 struct gfs2_quota_data *qd;
1483 struct gfs2_holder q_gh;
1484 int error;
1485
1486 memset(fdq, 0, sizeof(struct fs_disk_quota));
1487
1488 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1489 return -ESRCH; /* Crazy XFS error code */
1490
1491 if (type == USRQUOTA)
1492 type = QUOTA_USER;
1493 else if (type == GRPQUOTA)
1494 type = QUOTA_GROUP;
1495 else
1496 return -EINVAL;
1497
1498 error = qd_get(sdp, type, id, &qd);
1499 if (error)
1500 return error;
1501 error = do_glock(qd, FORCE, &q_gh);
1502 if (error)
1503 goto out;
1504
1505 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1506 fdq->d_version = FS_DQUOT_VERSION;
ade7ce31 1507 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
113d6b3c 1508 fdq->d_id = id;
14870b45
AD		 1509 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1510 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1511 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
113d6b3c
SW		 1512
1513 gfs2_glock_dq_uninit(&q_gh);
1514out:
1515 qd_put(qd);
1516 return error;
1517}
1518
e285c100 1519/* GFS2 only supports a subset of the XFS fields */
802ec9b6 1520#define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
e285c100 1521
c472b432
CH		 1522static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id,
1523 struct fs_disk_quota *fdq)
e285c100
SW		 1524{
1525 struct gfs2_sbd *sdp = sb->s_fs_info;
1526 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1527 struct gfs2_quota_data *qd;
1528 struct gfs2_holder q_gh, i_gh;
1529 unsigned int data_blocks, ind_blocks;
1530 unsigned int blocks = 0;
1531 int alloc_required;
1532 struct gfs2_alloc *al;
1533 loff_t offset;
1534 int error;
1535
1536 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1537 return -ESRCH; /* Crazy XFS error code */
1538
1539 switch(type) {
1540 case USRQUOTA:
1541 type = QUOTA_USER;
ade7ce31 1542 if (fdq->d_flags != FS_USER_QUOTA)
e285c100
SW		 1543 return -EINVAL;
1544 break;
1545 case GRPQUOTA:
1546 type = QUOTA_GROUP;
ade7ce31 1547 if (fdq->d_flags != FS_GROUP_QUOTA)
e285c100
SW		 1548 return -EINVAL;
1549 break;
1550 default:
1551 return -EINVAL;
1552 }
1553
1554 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1555 return -EINVAL;
1556 if (fdq->d_id != id)
1557 return -EINVAL;
1558
1559 error = qd_get(sdp, type, id, &qd);
1560 if (error)
1561 return error;
1562
1563 mutex_lock(&ip->i_inode.i_mutex);
1564 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1565 if (error)
1566 goto out_put;
1567 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1568 if (error)
1569 goto out_q;
1570
1571 /* Check for existing entry, if none then alloc new blocks */
1572 error = update_qd(sdp, qd);
1573 if (error)
1574 goto out_i;
1575
1576 /* If nothing has changed, this is a no-op */
1577 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
14870b45 1578 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
e285c100 1579 fdq->d_fieldmask ^= FS_DQ_BSOFT;
802ec9b6 1580
e285c100 1581 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
14870b45 1582 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
e285c100 1583 fdq->d_fieldmask ^= FS_DQ_BHARD;
802ec9b6
AD		 1584
1585 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1586 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1587 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1588
e285c100
SW		 1589 if (fdq->d_fieldmask == 0)
1590 goto out_i;
1591
1592 offset = qd2offset(qd);
461cb419 1593 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
e79a46a0
AD		 1594 if (gfs2_is_stuffed(ip))
1595 alloc_required = 1;
e285c100
SW		 1596 if (alloc_required) {
1597 al = gfs2_alloc_get(ip);
1598 if (al == NULL)
1599 goto out_i;
1600 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1601 &data_blocks, &ind_blocks);
1602 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1603 error = gfs2_inplace_reserve(ip);
1604 if (error)
1605 goto out_alloc;
54335b1f 1606 blocks += gfs2_rg_blocks(ip);
e285c100
SW		 1607 }
1608
e79a46a0
AD		 1609 /* Some quotas span block boundaries and can update two blocks,
1610 adding an extra block to the transaction to handle such quotas */
1611 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
e285c100
SW		 1612 if (error)
1613 goto out_release;
1614
1615 /* Apply changes */
1616 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1617
1618 gfs2_trans_end(sdp);
1619out_release:
1620 if (alloc_required) {
1621 gfs2_inplace_release(ip);
1622out_alloc:
1623 gfs2_alloc_put(ip);
1624 }
1625out_i:
1626 gfs2_glock_dq_uninit(&i_gh);
1627out_q:
1628 gfs2_glock_dq_uninit(&q_gh);
1629out_put:
1630 mutex_unlock(&ip->i_inode.i_mutex);
1631 qd_put(qd);
1632 return error;
1633}
1634
cc632e7f
SW		 1635const struct quotactl_ops gfs2_quotactl_ops = {
1636 .quota_sync = gfs2_quota_sync,
1d371b5e 1637 .get_xstate = gfs2_quota_get_xstate,
b9b2dd36 1638 .get_dqblk = gfs2_get_dqblk,
c472b432 1639 .set_dqblk = gfs2_set_dqblk,
cc632e7f 1640};
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