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Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.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>
41#include <linux/spinlock.h>
42#include <linux/completion.h>
43#include <linux/buffer_head.h>
b3b94faa 44#include <linux/sort.h>
18ec7d5c 45#include <linux/fs.h>
2e565bb6 46#include <linux/bio.h>
5c676f6d 47#include <linux/gfs2_ondisk.h>
37b2c837
SW		 48#include <linux/kthread.h>
49#include <linux/freezer.h>
2ec46505 50#include <linux/quota.h>
1d371b5e 51#include <linux/dqblk_xfs.h>
b3b94faa
DT		 52
53#include "gfs2.h"
5c676f6d 54#include "incore.h"
b3b94faa
DT		 55#include "bmap.h"
56#include "glock.h"
57#include "glops.h"
b3b94faa
DT		 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"
18ec7d5c 64#include "inode.h"
5c676f6d 65#include "util.h"
b3b94faa
DT		 66
67#define QUOTA_USER 1
68#define QUOTA_GROUP 0
69
bb8d8a6f
SW		 70struct gfs2_quota_change_host {
71 u64 qc_change;
72 u32 qc_flags; /* GFS2_QCF_... */
73 u32 qc_id;
74};
75
0a7ab79c
AD		 76static LIST_HEAD(qd_lru_list);
77static atomic_t qd_lru_count = ATOMIC_INIT(0);
1328df72 78static DEFINE_SPINLOCK(qd_lru_lock);
0a7ab79c
AD		 79
80int 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
0a7ab79c
AD		 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
f057f6cd 104 gfs2_glock_put(qd->qd_gl);
0a7ab79c
AD		 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
117out:
118 return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100;
119}
120
cd915493 121static u64 qd2offset(struct gfs2_quota_data *qd)
b3b94faa 122{
cd915493 123 u64 offset;
b3b94faa 124
cd915493 125 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
b3b94faa
DT		 126 offset *= sizeof(struct gfs2_quota);
127
128 return offset;
129}
130
cd915493 131static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
b3b94faa
DT		 132 struct gfs2_quota_data **qdp)
133{
134 struct gfs2_quota_data *qd;
135 int error;
136
37b2c837 137 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
b3b94faa
DT		 138 if (!qd)
139 return -ENOMEM;
140
0a7ab79c 141 atomic_set(&qd->qd_count, 1);
b3b94faa
DT		 142 qd->qd_id = id;
143 if (user)
144 set_bit(QDF_USER, &qd->qd_flags);
145 qd->qd_slot = -1;
0a7ab79c 146 INIT_LIST_HEAD(&qd->qd_reclaim);
b3b94faa 147
cd915493 148 error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
b3b94faa
DT		 149 &gfs2_quota_glops, CREATE, &qd->qd_gl);
150 if (error)
151 goto fail;
152
b3b94faa
DT		 153 *qdp = qd;
154
155 return 0;
156
a91ea69f 157fail:
37b2c837 158 kmem_cache_free(gfs2_quotad_cachep, qd);
b3b94faa
DT		 159 return error;
160}
161
6a6ada81 162static int qd_get(struct gfs2_sbd *sdp, int user, u32 id,
b3b94faa
DT		 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;
0a7ab79c 172 spin_lock(&qd_lru_lock);
b3b94faa
DT		 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) {
0a7ab79c
AD		 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);
b3b94faa
DT		 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
0a7ab79c 198 spin_unlock(&qd_lru_lock);
b3b94faa 199
6a6ada81 200 if (qd) {
b3b94faa 201 if (new_qd) {
f057f6cd 202 gfs2_glock_put(new_qd->qd_gl);
37b2c837 203 kmem_cache_free(gfs2_quotad_cachep, new_qd);
b3b94faa
DT		 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
215static void qd_hold(struct gfs2_quota_data *qd)
216{
217 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
0a7ab79c
AD		 218 gfs2_assert(sdp, atomic_read(&qd->qd_count));
219 atomic_inc(&qd->qd_count);
b3b94faa
DT		 220}
221
222static void qd_put(struct gfs2_quota_data *qd)
223{
0a7ab79c
AD		 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 }
b3b94faa
DT		 230}
231
232static 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
22077f57 238 spin_lock(&qd_lru_lock);
b3b94faa
DT		 239
240 if (qd->qd_slot_count++) {
22077f57 241 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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
a91ea69f 254found:
b3b94faa
DT		 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
22077f57 265 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 266
267 return 0;
268
a91ea69f 269fail:
b3b94faa 270 qd->qd_slot_count--;
22077f57 271 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 272 return -ENOSPC;
273}
274
275static void slot_hold(struct gfs2_quota_data *qd)
276{
277 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
278
22077f57 279 spin_lock(&qd_lru_lock);
b3b94faa
DT		 280 gfs2_assert(sdp, qd->qd_slot_count);
281 qd->qd_slot_count++;
22077f57 282 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 283}
284
285static void slot_put(struct gfs2_quota_data *qd)
286{
287 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
288
22077f57 289 spin_lock(&qd_lru_lock);
b3b94faa
DT		 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 }
22077f57 295 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 296}
297
298static int bh_get(struct gfs2_quota_data *qd)
299{
300 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
feaa7bba 301 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
b3b94faa 302 unsigned int block, offset;
b3b94faa
DT		 303 struct buffer_head *bh;
304 int error;
23591256 305 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
b3b94faa 306
f55ab26a 307 mutex_lock(&sdp->sd_quota_mutex);
b3b94faa
DT		 308
309 if (qd->qd_bh_count++) {
f55ab26a 310 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 311 return 0;
312 }
313
314 block = qd->qd_slot / sdp->sd_qc_per_block;
0d0868bd 315 offset = qd->qd_slot % sdp->sd_qc_per_block;
b3b94faa 316
23591256 317 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
e9e1ef2b 318 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
b3b94faa
DT		 319 if (error)
320 goto fail;
7276b3b0 321 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
b3b94faa
DT		 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
2e95b665 333 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 334
335 return 0;
336
a91ea69f 337fail_brelse:
b3b94faa 338 brelse(bh);
a91ea69f 339fail:
b3b94faa 340 qd->qd_bh_count--;
f55ab26a 341 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 342 return error;
343}
344
345static void bh_put(struct gfs2_quota_data *qd)
346{
347 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
348
f55ab26a 349 mutex_lock(&sdp->sd_quota_mutex);
b3b94faa
DT		 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 }
f55ab26a 356 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 357}
358
359static 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
0a7ab79c 370 spin_lock(&qd_lru_lock);
b3b94faa
DT		 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);
0a7ab79c
AD		 381 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
382 atomic_inc(&qd->qd_count);
b3b94faa
DT		 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
0a7ab79c 394 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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
412static 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
0a7ab79c 419 spin_lock(&qd_lru_lock);
b3b94faa
DT		 420
421 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
422 !test_bit(QDF_CHANGE, &qd->qd_flags)) {
0a7ab79c 423 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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);
0a7ab79c
AD		 430 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
431 atomic_inc(&qd->qd_count);
b3b94faa
DT		 432 qd->qd_change_sync = qd->qd_change;
433 gfs2_assert_warn(sdp, qd->qd_slot_count);
434 qd->qd_slot_count++;
435
0a7ab79c 436 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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
449static void qd_unlock(struct gfs2_quota_data *qd)
450{
568f4c96
SW		 451 gfs2_assert_warn(qd->qd_gl->gl_sbd,
452 test_bit(QDF_LOCKED, &qd->qd_flags));
b3b94faa
DT		 453 clear_bit(QDF_LOCKED, &qd->qd_flags);
454 bh_put(qd);
455 slot_put(qd);
456 qd_put(qd);
457}
458
33a82529 459static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id,
b3b94faa
DT		 460 struct gfs2_quota_data **qdp)
461{
462 int error;
463
6a6ada81 464 error = qd_get(sdp, user, id, qdp);
b3b94faa
DT		 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
a91ea69f 478fail_slot:
b3b94faa 479 slot_put(*qdp);
a91ea69f 480fail:
b3b94faa
DT		 481 qd_put(*qdp);
482 return error;
483}
484
485static void qdsb_put(struct gfs2_quota_data *qd)
486{
487 bh_put(qd);
488 slot_put(qd);
489 qd_put(qd);
490}
491
cd915493 492int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
b3b94faa 493{
feaa7bba 494 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
6dbd8224 495 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa
DT		 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
33a82529 506 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
b3b94faa
DT		 507 if (error)
508 goto out;
509 al->al_qd_num++;
510 qd++;
511
33a82529 512 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
b3b94faa
DT		 513 if (error)
514 goto out;
515 al->al_qd_num++;
516 qd++;
517
2933f925 518 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
33a82529 519 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
b3b94faa
DT		 520 if (error)
521 goto out;
522 al->al_qd_num++;
523 qd++;
524 }
525
2933f925 526 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
33a82529 527 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
b3b94faa
DT		 528 if (error)
529 goto out;
530 al->al_qd_num++;
531 qd++;
532 }
533
a91ea69f 534out:
b3b94faa
DT		 535 if (error)
536 gfs2_quota_unhold(ip);
b3b94faa
DT		 537 return error;
538}
539
540void gfs2_quota_unhold(struct gfs2_inode *ip)
541{
feaa7bba 542 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
6dbd8224 543 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa
DT		 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
555static int sort_qd(const void *a, const void *b)
556{
48fac179
SW		 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;
b3b94faa
DT		 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))
48fac179 563 return -1;
b3b94faa 564 else
48fac179 565 return 1;
b3b94faa 566 }
48fac179
SW		 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;
b3b94faa 571
48fac179 572 return 0;
b3b94faa
DT		 573}
574
cd915493 575static void do_qc(struct gfs2_quota_data *qd, s64 change)
b3b94faa
DT		 576{
577 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
feaa7bba 578 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
b3b94faa 579 struct gfs2_quota_change *qc = qd->qd_bh_qc;
cd915493 580 s64 x;
b3b94faa 581
f55ab26a 582 mutex_lock(&sdp->sd_quota_mutex);
d4e9c4c3 583 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
b3b94faa
DT		 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
b44b84d7 593 x = be64_to_cpu(qc->qc_change) + change;
b3b94faa
DT		 594 qc->qc_change = cpu_to_be64(x);
595
22077f57 596 spin_lock(&qd_lru_lock);
b3b94faa 597 qd->qd_change = x;
22077f57 598 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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 }
907b9bce 611
f55ab26a 612 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 613}
614
18ec7d5c 615/**
1e72c0f7
SW		 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
e285c100 619 * @change: The amount of usage change to record
1e72c0f7 620 * @qd: The quota data
e285c100 621 * @fdq: The updated limits to record
18ec7d5c
SW		 622 *
623 * This function was mostly borrowed from gfs2_block_truncate_page which was
624 * in turn mostly borrowed from ext3
1e72c0f7
SW		 625 *
626 * Returns: 0 or -ve on error
18ec7d5c 627 */
1e72c0f7 628
18ec7d5c 629static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
e285c100
SW		 630 s64 change, struct gfs2_quota_data *qd,
631 struct fs_disk_quota *fdq)
18ec7d5c 632{
feaa7bba 633 struct inode *inode = &ip->i_inode;
18ec7d5c
SW		 634 struct address_space *mapping = inode->i_mapping;
635 unsigned long index = loc >> PAGE_CACHE_SHIFT;
1990e917 636 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
18ec7d5c 637 unsigned blocksize, iblock, pos;
e285c100 638 struct buffer_head *bh, *dibh;
18ec7d5c
SW		 639 struct page *page;
640 void *kaddr;
1e72c0f7 641 struct gfs2_quota *qp;
e9fc2aa0 642 s64 value;
18ec7d5c 643 int err = -EIO;
e285c100 644 u64 size;
18ec7d5c 645
20b95bf2 646 if (gfs2_is_stuffed(ip))
0fd53554 647 gfs2_unstuff_dinode(ip, NULL);
20b95bf2 648
18ec7d5c
SW		 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)) {
e9e1ef2b 668 gfs2_block_map(inode, iblock, bh, 1);
18ec7d5c
SW		 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)) {
2e565bb6 677 ll_rw_block(READ_META, 1, &bh);
18ec7d5c
SW		 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);
1e72c0f7
SW		 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;
e285c100
SW		 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 }
18ec7d5c
SW		 700 flush_dcache_page(page);
701 kunmap_atomic(kaddr, KM_USER0);
e285c100
SW		 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
18ec7d5c
SW		 718unlock:
719 unlock_page(page);
720 page_cache_release(page);
721 return err;
722}
723
b3b94faa
DT		 724static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
725{
726 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
feaa7bba 727 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
b3b94faa
DT		 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;
f42faf4f 732 loff_t offset;
20b95bf2 733 unsigned int nalloc = 0, blocks;
b3b94faa
DT		 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
16c5f06f 740 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
b3b94faa
DT		 741 if (!ghs)
742 return -ENOMEM;
743
744 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
e285c100 745 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA);
b3b94faa 746 for (qx = 0; qx < num_qd; qx++) {
1e72c0f7 747 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
b3b94faa
DT		 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
20b95bf2
AD		 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;
b3b94faa 784
20b95bf2
AD		 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;
b3b94faa 790
20b95bf2
AD		 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;
b3b94faa
DT		 797
798 for (x = 0; x < num_qd; x++) {
b3b94faa
DT		 799 qd = qda[x];
800 offset = qd2offset(qd);
e285c100 801 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
18ec7d5c 802 if (error)
b3b94faa 803 goto out_end_trans;
b3b94faa
DT		 804
805 do_qc(qd, -qd->qd_change_sync);
b3b94faa
DT		 806 }
807
808 error = 0;
809
a91ea69f 810out_end_trans:
b3b94faa 811 gfs2_trans_end(sdp);
a91ea69f 812out_ipres:
20b95bf2 813 gfs2_inplace_release(ip);
a91ea69f 814out_alloc:
20b95bf2 815 gfs2_alloc_put(ip);
a91ea69f 816out_gunlock:
b3b94faa 817 gfs2_glock_dq_uninit(&i_gh);
a91ea69f 818out:
b3b94faa
DT		 819 while (qx--)
820 gfs2_glock_dq_uninit(&ghs[qx]);
e285c100 821 mutex_unlock(&ip->i_inode.i_mutex);
b3b94faa 822 kfree(ghs);
b09e593d 823 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
b3b94faa
DT		 824 return error;
825}
826
e285c100
SW		 827static 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
b3b94faa
DT		 852static 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;
feaa7bba 856 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
b3b94faa 857 struct gfs2_holder i_gh;
b3b94faa
DT		 858 int error;
859
a91ea69f 860restart:
b3b94faa
DT		 861 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
862 if (error)
863 return error;
864
e9fc2aa0 865 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
b3b94faa 866
e9fc2aa0 867 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
b3b94faa 868 gfs2_glock_dq_uninit(q_gh);
91094d0f
SW		 869 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
870 GL_NOCACHE, q_gh);
b3b94faa
DT		 871 if (error)
872 return error;
873
e9fc2aa0 874 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
b3b94faa
DT		 875 if (error)
876 goto fail;
877
e285c100
SW		 878 error = update_qd(sdp, qd);
879 if (error)
1e72c0f7 880 goto fail_gunlock;
b3b94faa 881
e285c100 882 gfs2_glock_dq_uninit(&i_gh);
91094d0f
SW		 883 gfs2_glock_dq_uninit(q_gh);
884 force_refresh = 0;
885 goto restart;
b3b94faa
DT		 886 }
887
888 return 0;
889
a91ea69f 890fail_gunlock:
b3b94faa 891 gfs2_glock_dq_uninit(&i_gh);
a91ea69f 892fail:
b3b94faa 893 gfs2_glock_dq_uninit(q_gh);
b3b94faa
DT		 894 return error;
895}
896
cd915493 897int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
b3b94faa 898{
feaa7bba 899 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
6dbd8224 900 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa
DT		 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
930static 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;
cd915493 934 s64 value;
b3b94faa
DT		 935 unsigned int num, den;
936 int do_sync = 1;
937
938 if (!qd->qd_qb.qb_limit)
939 return 0;
940
22077f57 941 spin_lock(&qd_lru_lock);
b3b94faa 942 value = qd->qd_change;
22077f57 943 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 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;
e9fc2aa0
SW		 952 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
953 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
b3b94faa
DT		 954 do_sync = 0;
955 else {
956 value *= gfs2_jindex_size(sdp) * num;
4abaca17 957 value = div_s64(value, den);
e9fc2aa0 958 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
cd915493 959 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
b3b94faa
DT		 960 do_sync = 0;
961 }
962
963 return do_sync;
964}
965
966void gfs2_quota_unlock(struct gfs2_inode *ip)
967{
6dbd8224 968 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa
DT		 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
a91ea69f 995out:
b3b94faa
DT		 996 gfs2_quota_unhold(ip);
997}
998
999#define MAX_LINE 256
1000
1001static int print_message(struct gfs2_quota_data *qd, char *type)
1002{
1003 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
b3b94faa 1004
2ec46505 1005 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
02630a12
SW		 1006 sdp->sd_fsname, type,
1007 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1008 qd->qd_id);
b3b94faa
DT		 1009
1010 return 0;
1011}
1012
cd915493 1013int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
b3b94faa 1014{
feaa7bba 1015 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
6dbd8224 1016 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa 1017 struct gfs2_quota_data *qd;
cd915493 1018 s64 value;
b3b94faa
DT		 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
e9fc2aa0 1035 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
22077f57 1036 spin_lock(&qd_lru_lock);
b3b94faa 1037 value += qd->qd_change;
22077f57 1038 spin_unlock(&qd_lru_lock);
b3b94faa 1039
cd915493 1040 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
b3b94faa 1041 print_message(qd, "exceeded");
2ec46505
SW		 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
b3b94faa
DT		 1046 error = -EDQUOT;
1047 break;
e9fc2aa0 1048 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
cd915493 1049 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
b3b94faa 1050 time_after_eq(jiffies, qd->qd_last_warn +
568f4c96
SW		 1051 gfs2_tune_get(sdp,
1052 gt_quota_warn_period) * HZ)) {
2ec46505
SW		 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);
b3b94faa
DT		 1056 error = print_message(qd, "warning");
1057 qd->qd_last_warn = jiffies;
1058 }
1059 }
1060
1061 return error;
1062}
1063
cd915493
SW		 1064void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1065 u32 uid, u32 gid)
b3b94faa 1066{
6dbd8224 1067 struct gfs2_alloc *al = ip->i_alloc;
b3b94faa
DT		 1068 struct gfs2_quota_data *qd;
1069 unsigned int x;
b3b94faa 1070
feaa7bba 1071 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
b3b94faa 1072 return;
383f01fb 1073 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
b3b94faa
DT		 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);
b3b94faa
DT		 1082 }
1083 }
1084}
1085
5fb324ad 1086int gfs2_quota_sync(struct super_block *sb, int type, int wait)
b3b94faa 1087{
8c42d637 1088 struct gfs2_sbd *sdp = sb->s_fs_info;
b3b94faa
DT		 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
5fb324ad
CH		 1130static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1131{
1132 return gfs2_quota_sync(sb, type, 0);
1133}
1134
cd915493 1135int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
b3b94faa
DT		 1136{
1137 struct gfs2_quota_data *qd;
1138 struct gfs2_holder q_gh;
1139 int error;
1140
6a6ada81 1141 error = qd_get(sdp, user, id, &qd);
b3b94faa
DT		 1142 if (error)
1143 return error;
1144
1145 error = do_glock(qd, FORCE, &q_gh);
1146 if (!error)
1147 gfs2_glock_dq_uninit(&q_gh);
1148
1149 qd_put(qd);
b3b94faa
DT		 1150 return error;
1151}
1152
bb8d8a6f
SW		 1153static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1154{
1155 const struct gfs2_quota_change *str = buf;
1156
1157 qc->qc_change = be64_to_cpu(str->qc_change);
1158 qc->qc_flags = be32_to_cpu(str->qc_flags);
1159 qc->qc_id = be32_to_cpu(str->qc_id);
1160}
1161
b3b94faa
DT		 1162int gfs2_quota_init(struct gfs2_sbd *sdp)
1163{
feaa7bba 1164 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
c9e98886 1165 unsigned int blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
b3b94faa
DT		 1166 unsigned int x, slot = 0;
1167 unsigned int found = 0;
cd915493
SW		 1168 u64 dblock;
1169 u32 extlen = 0;
b3b94faa
DT		 1170 int error;
1171
c9e98886
SW		 1172 if (!ip->i_disksize || ip->i_disksize > (64 << 20) ||
1173 ip->i_disksize & (sdp->sd_sb.sb_bsize - 1)) {
b3b94faa 1174 gfs2_consist_inode(ip);
907b9bce 1175 return -EIO;
b3b94faa
DT		 1176 }
1177 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
5c676f6d 1178 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
b3b94faa
DT		 1179
1180 error = -ENOMEM;
1181
1182 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
16c5f06f 1183 sizeof(unsigned char *), GFP_NOFS);
b3b94faa
DT		 1184 if (!sdp->sd_quota_bitmap)
1185 return error;
1186
1187 for (x = 0; x < sdp->sd_quota_chunks; x++) {
16c5f06f 1188 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
b3b94faa
DT		 1189 if (!sdp->sd_quota_bitmap[x])
1190 goto fail;
1191 }
1192
1193 for (x = 0; x < blocks; x++) {
1194 struct buffer_head *bh;
1195 unsigned int y;
1196
1197 if (!extlen) {
1198 int new = 0;
feaa7bba 1199 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
b3b94faa
DT		 1200 if (error)
1201 goto fail;
1202 }
b3b94faa 1203 error = -EIO;
7276b3b0
SW		 1204 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1205 if (!bh)
1206 goto fail;
b3b94faa
DT		 1207 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1208 brelse(bh);
1209 goto fail;
1210 }
1211
7276b3b0 1212 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
b3b94faa 1213 y++, slot++) {
b62f963e 1214 struct gfs2_quota_change_host qc;
b3b94faa
DT		 1215 struct gfs2_quota_data *qd;
1216
1217 gfs2_quota_change_in(&qc, bh->b_data +
1218 sizeof(struct gfs2_meta_header) +
1219 y * sizeof(struct gfs2_quota_change));
1220 if (!qc.qc_change)
1221 continue;
1222
1223 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1224 qc.qc_id, &qd);
1225 if (error) {
1226 brelse(bh);
1227 goto fail;
1228 }
1229
1230 set_bit(QDF_CHANGE, &qd->qd_flags);
1231 qd->qd_change = qc.qc_change;
1232 qd->qd_slot = slot;
1233 qd->qd_slot_count = 1;
b3b94faa 1234
0a7ab79c 1235 spin_lock(&qd_lru_lock);
b3b94faa
DT		 1236 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1237 list_add(&qd->qd_list, &sdp->sd_quota_list);
1238 atomic_inc(&sdp->sd_quota_count);
0a7ab79c 1239 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 1240
1241 found++;
1242 }
1243
1244 brelse(bh);
1245 dblock++;
1246 extlen--;
1247 }
1248
1249 if (found)
1250 fs_info(sdp, "found %u quota changes\n", found);
1251
1252 return 0;
1253
a91ea69f 1254fail:
b3b94faa
DT		 1255 gfs2_quota_cleanup(sdp);
1256 return error;
1257}
1258
b3b94faa
DT		 1259void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1260{
1261 struct list_head *head = &sdp->sd_quota_list;
1262 struct gfs2_quota_data *qd;
1263 unsigned int x;
1264
0a7ab79c 1265 spin_lock(&qd_lru_lock);
b3b94faa
DT		 1266 while (!list_empty(head)) {
1267 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1268
0a7ab79c
AD		 1269 if (atomic_read(&qd->qd_count) > 1 ||
1270 (atomic_read(&qd->qd_count) &&
1271 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
0a7ab79c
AD		 1272 list_move(&qd->qd_list, head);
1273 spin_unlock(&qd_lru_lock);
b3b94faa 1274 schedule();
0a7ab79c 1275 spin_lock(&qd_lru_lock);
b3b94faa
DT		 1276 continue;
1277 }
1278
1279 list_del(&qd->qd_list);
0a7ab79c
AD		 1280 /* Also remove if this qd exists in the reclaim list */
1281 if (!list_empty(&qd->qd_reclaim)) {
1282 list_del_init(&qd->qd_reclaim);
1283 atomic_dec(&qd_lru_count);
1284 }
b3b94faa 1285 atomic_dec(&sdp->sd_quota_count);
0a7ab79c 1286 spin_unlock(&qd_lru_lock);
b3b94faa 1287
0a7ab79c 1288 if (!atomic_read(&qd->qd_count)) {
b3b94faa
DT		 1289 gfs2_assert_warn(sdp, !qd->qd_change);
1290 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1291 } else
1292 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1293 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1294
f057f6cd 1295 gfs2_glock_put(qd->qd_gl);
37b2c837 1296 kmem_cache_free(gfs2_quotad_cachep, qd);
b3b94faa 1297
0a7ab79c 1298 spin_lock(&qd_lru_lock);
b3b94faa 1299 }
0a7ab79c 1300 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 1301
1302 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1303
1304 if (sdp->sd_quota_bitmap) {
1305 for (x = 0; x < sdp->sd_quota_chunks; x++)
1306 kfree(sdp->sd_quota_bitmap[x]);
1307 kfree(sdp->sd_quota_bitmap);
1308 }
1309}
1310
37b2c837
SW		 1311static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1312{
1313 if (error == 0 || error == -EROFS)
1314 return;
1315 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1316 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1317}
1318
1319static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
8c42d637 1320 int (*fxn)(struct super_block *sb, int type),
37b2c837
SW		 1321 unsigned long t, unsigned long *timeo,
1322 unsigned int *new_timeo)
1323{
1324 if (t >= *timeo) {
8c42d637 1325 int error = fxn(sdp->sd_vfs, 0);
37b2c837
SW		 1326 quotad_error(sdp, msg, error);
1327 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1328 } else {
1329 *timeo -= t;
1330 }
1331}
1332
813e0c46
SW		 1333static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1334{
1335 struct gfs2_inode *ip;
1336
1337 while(1) {
1338 ip = NULL;
1339 spin_lock(&sdp->sd_trunc_lock);
1340 if (!list_empty(&sdp->sd_trunc_list)) {
1341 ip = list_entry(sdp->sd_trunc_list.next,
1342 struct gfs2_inode, i_trunc_list);
1343 list_del_init(&ip->i_trunc_list);
1344 }
1345 spin_unlock(&sdp->sd_trunc_lock);
1346 if (ip == NULL)
1347 return;
1348 gfs2_glock_finish_truncate(ip);
1349 }
1350}
1351
3d3c10f2
BM		 1352void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1353 if (!sdp->sd_statfs_force_sync) {
1354 sdp->sd_statfs_force_sync = 1;
1355 wake_up(&sdp->sd_quota_wait);
1356 }
1357}
1358
1359
37b2c837
SW		 1360/**
1361 * gfs2_quotad - Write cached quota changes into the quota file
1362 * @sdp: Pointer to GFS2 superblock
1363 *
1364 */
1365
1366int gfs2_quotad(void *data)
1367{
1368 struct gfs2_sbd *sdp = data;
1369 struct gfs2_tune *tune = &sdp->sd_tune;
1370 unsigned long statfs_timeo = 0;
1371 unsigned long quotad_timeo = 0;
1372 unsigned long t = 0;
1373 DEFINE_WAIT(wait);
813e0c46 1374 int empty;
37b2c837
SW		 1375
1376 while (!kthread_should_stop()) {
1377
1378 /* Update the master statfs file */
3d3c10f2
BM		 1379 if (sdp->sd_statfs_force_sync) {
1380 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1381 quotad_error(sdp, "statfs", error);
1382 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1383 }
1384 else
1385 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1386 &statfs_timeo,
1387 &tune->gt_statfs_quantum);
37b2c837
SW		 1388
1389 /* Update quota file */
5fb324ad 1390 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
37b2c837
SW		 1391 &quotad_timeo, &tune->gt_quota_quantum);
1392
813e0c46
SW		 1393 /* Check for & recover partially truncated inodes */
1394 quotad_check_trunc_list(sdp);
1395
37b2c837
SW		 1396 if (freezing(current))
1397 refrigerator();
1398 t = min(quotad_timeo, statfs_timeo);
1399
7fa5d20d 1400 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
813e0c46
SW		 1401 spin_lock(&sdp->sd_trunc_lock);
1402 empty = list_empty(&sdp->sd_trunc_list);
1403 spin_unlock(&sdp->sd_trunc_lock);
3d3c10f2 1404 if (empty && !sdp->sd_statfs_force_sync)
813e0c46
SW		 1405 t -= schedule_timeout(t);
1406 else
1407 t = 0;
37b2c837
SW		 1408 finish_wait(&sdp->sd_quota_wait, &wait);
1409 }
1410
1411 return 0;
1412}
1413
1d371b5e
SW		 1414static int gfs2_quota_get_xstate(struct super_block *sb,
1415 struct fs_quota_stat *fqs)
1416{
1417 struct gfs2_sbd *sdp = sb->s_fs_info;
1418
1419 memset(fqs, 0, sizeof(struct fs_quota_stat));
1420 fqs->qs_version = FS_QSTAT_VERSION;
1421 if (sdp->sd_args.ar_quota == GFS2_QUOTA_ON)
1422 fqs->qs_flags = (XFS_QUOTA_UDQ_ENFD | XFS_QUOTA_GDQ_ENFD);
1423 else if (sdp->sd_args.ar_quota == GFS2_QUOTA_ACCOUNT)
1424 fqs->qs_flags = (XFS_QUOTA_UDQ_ACCT | XFS_QUOTA_GDQ_ACCT);
1425 if (sdp->sd_quota_inode) {
1426 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1427 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1428 }
1429 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1430 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1431 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1432 return 0;
1433}
1434
113d6b3c
SW		 1435static int gfs2_xquota_get(struct super_block *sb, int type, qid_t id,
1436 struct fs_disk_quota *fdq)
1437{
1438 struct gfs2_sbd *sdp = sb->s_fs_info;
1439 struct gfs2_quota_lvb *qlvb;
1440 struct gfs2_quota_data *qd;
1441 struct gfs2_holder q_gh;
1442 int error;
1443
1444 memset(fdq, 0, sizeof(struct fs_disk_quota));
1445
1446 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1447 return -ESRCH; /* Crazy XFS error code */
1448
1449 if (type == USRQUOTA)
1450 type = QUOTA_USER;
1451 else if (type == GRPQUOTA)
1452 type = QUOTA_GROUP;
1453 else
1454 return -EINVAL;
1455
1456 error = qd_get(sdp, type, id, &qd);
1457 if (error)
1458 return error;
1459 error = do_glock(qd, FORCE, &q_gh);
1460 if (error)
1461 goto out;
1462
1463 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
1464 fdq->d_version = FS_DQUOT_VERSION;
1465 fdq->d_flags = (type == QUOTA_USER) ? XFS_USER_QUOTA : XFS_GROUP_QUOTA;
1466 fdq->d_id = id;
1467 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit);
1468 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn);
1469 fdq->d_bcount = be64_to_cpu(qlvb->qb_value);
1470
1471 gfs2_glock_dq_uninit(&q_gh);
1472out:
1473 qd_put(qd);
1474 return error;
1475}
1476
e285c100
SW		 1477/* GFS2 only supports a subset of the XFS fields */
1478#define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD)
1479
1480static int gfs2_xquota_set(struct super_block *sb, int type, qid_t id,
1481 struct fs_disk_quota *fdq)
1482{
1483 struct gfs2_sbd *sdp = sb->s_fs_info;
1484 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1485 struct gfs2_quota_data *qd;
1486 struct gfs2_holder q_gh, i_gh;
1487 unsigned int data_blocks, ind_blocks;
1488 unsigned int blocks = 0;
1489 int alloc_required;
1490 struct gfs2_alloc *al;
1491 loff_t offset;
1492 int error;
1493
1494 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1495 return -ESRCH; /* Crazy XFS error code */
1496
1497 switch(type) {
1498 case USRQUOTA:
1499 type = QUOTA_USER;
1500 if (fdq->d_flags != XFS_USER_QUOTA)
1501 return -EINVAL;
1502 break;
1503 case GRPQUOTA:
1504 type = QUOTA_GROUP;
1505 if (fdq->d_flags != XFS_GROUP_QUOTA)
1506 return -EINVAL;
1507 break;
1508 default:
1509 return -EINVAL;
1510 }
1511
1512 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1513 return -EINVAL;
1514 if (fdq->d_id != id)
1515 return -EINVAL;
1516
1517 error = qd_get(sdp, type, id, &qd);
1518 if (error)
1519 return error;
1520
1521 mutex_lock(&ip->i_inode.i_mutex);
1522 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1523 if (error)
1524 goto out_put;
1525 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1526 if (error)
1527 goto out_q;
1528
1529 /* Check for existing entry, if none then alloc new blocks */
1530 error = update_qd(sdp, qd);
1531 if (error)
1532 goto out_i;
1533
1534 /* If nothing has changed, this is a no-op */
1535 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1536 (fdq->d_blk_softlimit == be64_to_cpu(qd->qd_qb.qb_warn)))
1537 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1538 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1539 (fdq->d_blk_hardlimit == be64_to_cpu(qd->qd_qb.qb_limit)))
1540 fdq->d_fieldmask ^= FS_DQ_BHARD;
1541 if (fdq->d_fieldmask == 0)
1542 goto out_i;
1543
1544 offset = qd2offset(qd);
1545 error = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota),
1546 &alloc_required);
1547 if (error)
1548 goto out_i;
1549 if (alloc_required) {
1550 al = gfs2_alloc_get(ip);
1551 if (al == NULL)
1552 goto out_i;
1553 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1554 &data_blocks, &ind_blocks);
1555 blocks = al->al_requested = 1 + data_blocks + ind_blocks;
1556 error = gfs2_inplace_reserve(ip);
1557 if (error)
1558 goto out_alloc;
1559 }
1560
1561 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0);
1562 if (error)
1563 goto out_release;
1564
1565 /* Apply changes */
1566 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1567
1568 gfs2_trans_end(sdp);
1569out_release:
1570 if (alloc_required) {
1571 gfs2_inplace_release(ip);
1572out_alloc:
1573 gfs2_alloc_put(ip);
1574 }
1575out_i:
1576 gfs2_glock_dq_uninit(&i_gh);
1577out_q:
1578 gfs2_glock_dq_uninit(&q_gh);
1579out_put:
1580 mutex_unlock(&ip->i_inode.i_mutex);
1581 qd_put(qd);
1582 return error;
1583}
1584
cc632e7f
SW		 1585const struct quotactl_ops gfs2_quotactl_ops = {
1586 .quota_sync = gfs2_quota_sync,
1d371b5e 1587 .get_xstate = gfs2_quota_get_xstate,
113d6b3c 1588 .get_xquota = gfs2_xquota_get,
e285c100 1589 .set_xquota = gfs2_xquota_set,
cc632e7f
SW		 1590};
1591
Linux 6.x block layer and io_uring tree(s)