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Merge branch 'pm-assorted'
[GitHub/mt8127/android_kernel_alcatel_ttab.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);
5407e242 497 struct gfs2_quota_data **qd;
b3b94faa
DT		 498 int error;
499
aaaf68c5
AP		 500 if (ip->i_res == NULL) {
501 error = gfs2_rs_alloc(ip);
502 if (error)
503 return error;
504 }
5407e242
BP		 505
506 qd = ip->i_res->rs_qa_qd;
507
508 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
b3b94faa
DT		 509 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
510 return -EIO;
511
512 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
513 return 0;
514
33a82529 515 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd);
b3b94faa
DT		 516 if (error)
517 goto out;
5407e242 518 ip->i_res->rs_qa_qd_num++;
b3b94faa
DT		 519 qd++;
520
33a82529 521 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd);
b3b94faa
DT		 522 if (error)
523 goto out;
5407e242 524 ip->i_res->rs_qa_qd_num++;
b3b94faa
DT		 525 qd++;
526
2933f925 527 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
33a82529 528 error = qdsb_get(sdp, QUOTA_USER, uid, qd);
b3b94faa
DT		 529 if (error)
530 goto out;
5407e242 531 ip->i_res->rs_qa_qd_num++;
b3b94faa
DT		 532 qd++;
533 }
534
2933f925 535 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
33a82529 536 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd);
b3b94faa
DT		 537 if (error)
538 goto out;
5407e242 539 ip->i_res->rs_qa_qd_num++;
b3b94faa
DT		 540 qd++;
541 }
542
a91ea69f 543out:
b3b94faa
DT		 544 if (error)
545 gfs2_quota_unhold(ip);
b3b94faa
DT		 546 return error;
547}
548
549void gfs2_quota_unhold(struct gfs2_inode *ip)
550{
feaa7bba 551 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
b3b94faa
DT		 552 unsigned int x;
553
5407e242
BP		 554 if (ip->i_res == NULL)
555 return;
b3b94faa
DT		 556 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
557
5407e242
BP		 558 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
559 qdsb_put(ip->i_res->rs_qa_qd[x]);
560 ip->i_res->rs_qa_qd[x] = NULL;
b3b94faa 561 }
5407e242 562 ip->i_res->rs_qa_qd_num = 0;
b3b94faa
DT		 563}
564
565static int sort_qd(const void *a, const void *b)
566{
48fac179
SW		 567 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
568 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
b3b94faa
DT		 569
570 if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
571 !test_bit(QDF_USER, &qd_b->qd_flags)) {
572 if (test_bit(QDF_USER, &qd_a->qd_flags))
48fac179 573 return -1;
b3b94faa 574 else
48fac179 575 return 1;
b3b94faa 576 }
48fac179
SW		 577 if (qd_a->qd_id < qd_b->qd_id)
578 return -1;
579 if (qd_a->qd_id > qd_b->qd_id)
580 return 1;
b3b94faa 581
48fac179 582 return 0;
b3b94faa
DT		 583}
584
cd915493 585static void do_qc(struct gfs2_quota_data *qd, s64 change)
b3b94faa
DT		 586{
587 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
feaa7bba 588 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
b3b94faa 589 struct gfs2_quota_change *qc = qd->qd_bh_qc;
cd915493 590 s64 x;
b3b94faa 591
f55ab26a 592 mutex_lock(&sdp->sd_quota_mutex);
d4e9c4c3 593 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
b3b94faa
DT		 594
595 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
596 qc->qc_change = 0;
597 qc->qc_flags = 0;
598 if (test_bit(QDF_USER, &qd->qd_flags))
599 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
600 qc->qc_id = cpu_to_be32(qd->qd_id);
601 }
602
b44b84d7 603 x = be64_to_cpu(qc->qc_change) + change;
b3b94faa
DT		 604 qc->qc_change = cpu_to_be64(x);
605
22077f57 606 spin_lock(&qd_lru_lock);
b3b94faa 607 qd->qd_change = x;
22077f57 608 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 609
610 if (!x) {
611 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
612 clear_bit(QDF_CHANGE, &qd->qd_flags);
613 qc->qc_flags = 0;
614 qc->qc_id = 0;
615 slot_put(qd);
616 qd_put(qd);
617 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
618 qd_hold(qd);
619 slot_hold(qd);
620 }
907b9bce 621
f55ab26a 622 mutex_unlock(&sdp->sd_quota_mutex);
b3b94faa
DT		 623}
624
18ec7d5c 625/**
1e72c0f7
SW		 626 * gfs2_adjust_quota - adjust record of current block usage
627 * @ip: The quota inode
628 * @loc: Offset of the entry in the quota file
e285c100 629 * @change: The amount of usage change to record
1e72c0f7 630 * @qd: The quota data
e285c100 631 * @fdq: The updated limits to record
18ec7d5c
SW		 632 *
633 * This function was mostly borrowed from gfs2_block_truncate_page which was
634 * in turn mostly borrowed from ext3
1e72c0f7
SW		 635 *
636 * Returns: 0 or -ve on error
18ec7d5c 637 */
1e72c0f7 638
18ec7d5c 639static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
e285c100
SW		 640 s64 change, struct gfs2_quota_data *qd,
641 struct fs_disk_quota *fdq)
18ec7d5c 642{
feaa7bba 643 struct inode *inode = &ip->i_inode;
14870b45 644 struct gfs2_sbd *sdp = GFS2_SB(inode);
18ec7d5c
SW		 645 struct address_space *mapping = inode->i_mapping;
646 unsigned long index = loc >> PAGE_CACHE_SHIFT;
1990e917 647 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
18ec7d5c 648 unsigned blocksize, iblock, pos;
ab9bbda0 649 struct buffer_head *bh;
18ec7d5c 650 struct page *page;
7e619bc3
AD		 651 void *kaddr, *ptr;
652 struct gfs2_quota q, *qp;
653 int err, nbytes;
e285c100 654 u64 size;
18ec7d5c 655
891a8e93
SW		 656 if (gfs2_is_stuffed(ip)) {
657 err = gfs2_unstuff_dinode(ip, NULL);
658 if (err)
659 return err;
660 }
7e619bc3
AD		 661
662 memset(&q, 0, sizeof(struct gfs2_quota));
4306629e 663 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
7e619bc3
AD		 664 if (err < 0)
665 return err;
666
667 err = -EIO;
668 qp = &q;
669 qp->qu_value = be64_to_cpu(qp->qu_value);
670 qp->qu_value += change;
671 qp->qu_value = cpu_to_be64(qp->qu_value);
672 qd->qd_qb.qb_value = qp->qu_value;
673 if (fdq) {
674 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
14870b45 675 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
7e619bc3
AD		 676 qd->qd_qb.qb_warn = qp->qu_warn;
677 }
678 if (fdq->d_fieldmask & FS_DQ_BHARD) {
14870b45 679 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
7e619bc3
AD		 680 qd->qd_qb.qb_limit = qp->qu_limit;
681 }
802ec9b6
AD		 682 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
683 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
684 qd->qd_qb.qb_value = qp->qu_value;
685 }
7e619bc3
AD		 686 }
687
688 /* Write the quota into the quota file on disk */
689 ptr = qp;
690 nbytes = sizeof(struct gfs2_quota);
691get_a_page:
220cca2a 692 page = find_or_create_page(mapping, index, GFP_NOFS);
18ec7d5c
SW		 693 if (!page)
694 return -ENOMEM;
695
696 blocksize = inode->i_sb->s_blocksize;
697 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
698
699 if (!page_has_buffers(page))
700 create_empty_buffers(page, blocksize, 0);
701
702 bh = page_buffers(page);
703 pos = blocksize;
704 while (offset >= pos) {
705 bh = bh->b_this_page;
706 iblock++;
707 pos += blocksize;
708 }
709
710 if (!buffer_mapped(bh)) {
e9e1ef2b 711 gfs2_block_map(inode, iblock, bh, 1);
18ec7d5c 712 if (!buffer_mapped(bh))
7e619bc3
AD		 713 goto unlock_out;
714 /* If it's a newly allocated disk block for quota, zero it */
8b421601
AD		 715 if (buffer_new(bh))
716 zero_user(page, pos - blocksize, bh->b_size);
18ec7d5c
SW		 717 }
718
719 if (PageUptodate(page))
720 set_buffer_uptodate(bh);
721
722 if (!buffer_uptodate(bh)) {
20ed0535 723 ll_rw_block(READ | REQ_META, 1, &bh);
18ec7d5c
SW		 724 wait_on_buffer(bh);
725 if (!buffer_uptodate(bh))
7e619bc3 726 goto unlock_out;
18ec7d5c
SW		 727 }
728
729 gfs2_trans_add_bh(ip->i_gl, bh, 0);
730
d9349285 731 kaddr = kmap_atomic(page);
7e619bc3
AD		 732 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
733 nbytes = PAGE_CACHE_SIZE - offset;
734 memcpy(kaddr + offset, ptr, nbytes);
18ec7d5c 735 flush_dcache_page(page);
d9349285 736 kunmap_atomic(kaddr);
7e619bc3
AD		 737 unlock_page(page);
738 page_cache_release(page);
739
740 /* If quota straddles page boundary, we need to update the rest of the
741 * quota at the beginning of the next page */
8b421601 742 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
7e619bc3
AD		 743 ptr = ptr + nbytes;
744 nbytes = sizeof(struct gfs2_quota) - nbytes;
745 offset = 0;
746 index++;
747 goto get_a_page;
748 }
e285c100 749
e285c100 750 size = loc + sizeof(struct gfs2_quota);
a2e0f799 751 if (size > inode->i_size)
e285c100 752 i_size_write(inode, size);
e285c100 753 inode->i_mtime = inode->i_atime = CURRENT_TIME;
e285c100 754 mark_inode_dirty(inode);
500242ac 755 return 0;
ab9bbda0 756
7e619bc3 757unlock_out:
18ec7d5c
SW		 758 unlock_page(page);
759 page_cache_release(page);
760 return err;
761}
762
b3b94faa
DT		 763static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
764{
765 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
feaa7bba 766 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
b3b94faa
DT		 767 unsigned int data_blocks, ind_blocks;
768 struct gfs2_holder *ghs, i_gh;
769 unsigned int qx, x;
770 struct gfs2_quota_data *qd;
71f890f7 771 unsigned reserved;
f42faf4f 772 loff_t offset;
20b95bf2 773 unsigned int nalloc = 0, blocks;
b3b94faa
DT		 774 int error;
775
0a305e49
BP		 776 error = gfs2_rs_alloc(ip);
777 if (error)
778 return error;
779
b3b94faa
DT		 780 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
781 &data_blocks, &ind_blocks);
782
16c5f06f 783 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
b3b94faa
DT		 784 if (!ghs)
785 return -ENOMEM;
786
787 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
56aa72d0 788 mutex_lock(&ip->i_inode.i_mutex);
b3b94faa 789 for (qx = 0; qx < num_qd; qx++) {
1e72c0f7 790 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
b3b94faa
DT		 791 GL_NOCACHE, &ghs[qx]);
792 if (error)
793 goto out;
794 }
795
796 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
797 if (error)
798 goto out;
799
800 for (x = 0; x < num_qd; x++) {
b3b94faa 801 offset = qd2offset(qda[x]);
461cb419
BP		 802 if (gfs2_write_alloc_required(ip, offset,
803 sizeof(struct gfs2_quota)))
b3b94faa
DT		 804 nalloc++;
805 }
806
20b95bf2
AD		 807 /*
808 * 1 blk for unstuffing inode if stuffed. We add this extra
809 * block to the reservation unconditionally. If the inode
810 * doesn't need unstuffing, the block will be released to the
811 * rgrp since it won't be allocated during the transaction
812 */
7e619bc3
AD		 813 /* +3 in the end for unstuffing block, inode size update block
814 * and another block in case quota straddles page boundary and
815 * two blocks need to be updated instead of 1 */
816 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
b3b94faa 817
71f890f7 818 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
9dbe9610 819 error = gfs2_inplace_reserve(ip, reserved, 0);
20b95bf2
AD		 820 if (error)
821 goto out_alloc;
b3b94faa 822
20b95bf2 823 if (nalloc)
71f890f7 824 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
20b95bf2
AD		 825
826 error = gfs2_trans_begin(sdp, blocks, 0);
827 if (error)
828 goto out_ipres;
b3b94faa
DT		 829
830 for (x = 0; x < num_qd; x++) {
b3b94faa
DT		 831 qd = qda[x];
832 offset = qd2offset(qd);
e285c100 833 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
18ec7d5c 834 if (error)
b3b94faa 835 goto out_end_trans;
b3b94faa
DT		 836
837 do_qc(qd, -qd->qd_change_sync);
662e3a55 838 set_bit(QDF_REFRESH, &qd->qd_flags);
b3b94faa
DT		 839 }
840
841 error = 0;
842
a91ea69f 843out_end_trans:
b3b94faa 844 gfs2_trans_end(sdp);
a91ea69f 845out_ipres:
20b95bf2 846 gfs2_inplace_release(ip);
a91ea69f 847out_alloc:
b3b94faa 848 gfs2_glock_dq_uninit(&i_gh);
a91ea69f 849out:
b3b94faa
DT		 850 while (qx--)
851 gfs2_glock_dq_uninit(&ghs[qx]);
e285c100 852 mutex_unlock(&ip->i_inode.i_mutex);
b3b94faa 853 kfree(ghs);
b09e593d 854 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
b3b94faa
DT		 855 return error;
856}
857
e285c100
SW		 858static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
859{
860 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
861 struct gfs2_quota q;
862 struct gfs2_quota_lvb *qlvb;
863 loff_t pos;
864 int error;
865
866 memset(&q, 0, sizeof(struct gfs2_quota));
867 pos = qd2offset(qd);
4306629e 868 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
e285c100
SW		 869 if (error < 0)
870 return error;
871
4e2f8849 872 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
e285c100
SW		 873 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
874 qlvb->__pad = 0;
875 qlvb->qb_limit = q.qu_limit;
876 qlvb->qb_warn = q.qu_warn;
877 qlvb->qb_value = q.qu_value;
878 qd->qd_qb = *qlvb;
879
880 return 0;
881}
882
b3b94faa
DT		 883static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
884 struct gfs2_holder *q_gh)
885{
886 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
feaa7bba 887 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
b3b94faa 888 struct gfs2_holder i_gh;
b3b94faa
DT		 889 int error;
890
a91ea69f 891restart:
b3b94faa
DT		 892 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
893 if (error)
894 return error;
895
4e2f8849 896 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
b3b94faa 897
e9fc2aa0 898 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
b3b94faa 899 gfs2_glock_dq_uninit(q_gh);
91094d0f
SW		 900 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
901 GL_NOCACHE, q_gh);
b3b94faa
DT		 902 if (error)
903 return error;
904
e9fc2aa0 905 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
b3b94faa
DT		 906 if (error)
907 goto fail;
908
e285c100
SW		 909 error = update_qd(sdp, qd);
910 if (error)
1e72c0f7 911 goto fail_gunlock;
b3b94faa 912
e285c100 913 gfs2_glock_dq_uninit(&i_gh);
91094d0f
SW		 914 gfs2_glock_dq_uninit(q_gh);
915 force_refresh = 0;
916 goto restart;
b3b94faa
DT		 917 }
918
919 return 0;
920
a91ea69f 921fail_gunlock:
b3b94faa 922 gfs2_glock_dq_uninit(&i_gh);
a91ea69f 923fail:
b3b94faa 924 gfs2_glock_dq_uninit(q_gh);
b3b94faa
DT		 925 return error;
926}
927
cd915493 928int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
b3b94faa 929{
feaa7bba 930 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
662e3a55 931 struct gfs2_quota_data *qd;
b3b94faa
DT		 932 unsigned int x;
933 int error = 0;
934
891a8e93
SW		 935 error = gfs2_quota_hold(ip, uid, gid);
936 if (error)
937 return error;
b3b94faa
DT		 938
939 if (capable(CAP_SYS_RESOURCE) ||
940 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
941 return 0;
942
5407e242
BP		 943 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
944 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
b3b94faa 945
5407e242 946 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
662e3a55 947 int force = NO_FORCE;
5407e242 948 qd = ip->i_res->rs_qa_qd[x];
662e3a55
AD		 949 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
950 force = FORCE;
5407e242 951 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
b3b94faa
DT		 952 if (error)
953 break;
954 }
955
956 if (!error)
957 set_bit(GIF_QD_LOCKED, &ip->i_flags);
958 else {
959 while (x--)
5407e242 960 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
b3b94faa
DT		 961 gfs2_quota_unhold(ip);
962 }
963
964 return error;
965}
966
967static int need_sync(struct gfs2_quota_data *qd)
968{
969 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
970 struct gfs2_tune *gt = &sdp->sd_tune;
cd915493 971 s64 value;
b3b94faa
DT		 972 unsigned int num, den;
973 int do_sync = 1;
974
975 if (!qd->qd_qb.qb_limit)
976 return 0;
977
22077f57 978 spin_lock(&qd_lru_lock);
b3b94faa 979 value = qd->qd_change;
22077f57 980 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 981
982 spin_lock(&gt->gt_spin);
983 num = gt->gt_quota_scale_num;
984 den = gt->gt_quota_scale_den;
985 spin_unlock(&gt->gt_spin);
986
987 if (value < 0)
988 do_sync = 0;
e9fc2aa0
SW		 989 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
990 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
b3b94faa
DT		 991 do_sync = 0;
992 else {
993 value *= gfs2_jindex_size(sdp) * num;
4abaca17 994 value = div_s64(value, den);
e9fc2aa0 995 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
cd915493 996 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
b3b94faa
DT		 997 do_sync = 0;
998 }
999
1000 return do_sync;
1001}
1002
1003void gfs2_quota_unlock(struct gfs2_inode *ip)
1004{
b3b94faa
DT		 1005 struct gfs2_quota_data *qda[4];
1006 unsigned int count = 0;
1007 unsigned int x;
1008
1009 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1010 goto out;
1011
5407e242 1012 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
b3b94faa
DT		 1013 struct gfs2_quota_data *qd;
1014 int sync;
1015
5407e242 1016 qd = ip->i_res->rs_qa_qd[x];
b3b94faa
DT		 1017 sync = need_sync(qd);
1018
5407e242 1019 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
b3b94faa
DT		 1020
1021 if (sync && qd_trylock(qd))
1022 qda[count++] = qd;
1023 }
1024
1025 if (count) {
1026 do_sync(count, qda);
1027 for (x = 0; x < count; x++)
1028 qd_unlock(qda[x]);
1029 }
1030
a91ea69f 1031out:
b3b94faa
DT		 1032 gfs2_quota_unhold(ip);
1033}
1034
1035#define MAX_LINE 256
1036
1037static int print_message(struct gfs2_quota_data *qd, char *type)
1038{
1039 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
b3b94faa 1040
2ec46505 1041 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
02630a12
SW		 1042 sdp->sd_fsname, type,
1043 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
1044 qd->qd_id);
b3b94faa
DT		 1045
1046 return 0;
1047}
1048
cd915493 1049int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
b3b94faa 1050{
feaa7bba 1051 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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
5407e242
BP		 1063 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1064 qd = ip->i_res->rs_qa_qd[x];
b3b94faa
DT		 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");
431f1974
EB		 1077 quota_send_warning(make_kqid(&init_user_ns,
1078 test_bit(QDF_USER, &qd->qd_flags) ?
1079 USRQUOTA : GRPQUOTA,
1080 qd->qd_id),
2ec46505
SW		 1081 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1082
b3b94faa
DT		 1083 error = -EDQUOT;
1084 break;
e9fc2aa0 1085 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
cd915493 1086 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
b3b94faa 1087 time_after_eq(jiffies, qd->qd_last_warn +
568f4c96
SW		 1088 gfs2_tune_get(sdp,
1089 gt_quota_warn_period) * HZ)) {
431f1974
EB		 1090 quota_send_warning(make_kqid(&init_user_ns,
1091 test_bit(QDF_USER, &qd->qd_flags) ?
1092 USRQUOTA : GRPQUOTA,
1093 qd->qd_id),
2ec46505 1094 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
b3b94faa
DT		 1095 error = print_message(qd, "warning");
1096 qd->qd_last_warn = jiffies;
1097 }
1098 }
1099
1100 return error;
1101}
1102
cd915493
SW		 1103void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1104 u32 uid, u32 gid)
b3b94faa 1105{
b3b94faa
DT		 1106 struct gfs2_quota_data *qd;
1107 unsigned int x;
b3b94faa 1108
feaa7bba 1109 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
b3b94faa 1110 return;
383f01fb 1111 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
b3b94faa
DT		 1112 return;
1113
5407e242
BP		 1114 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1115 qd = ip->i_res->rs_qa_qd[x];
b3b94faa
DT		 1116
1117 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1118 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1119 do_qc(qd, change);
b3b94faa
DT		 1120 }
1121 }
1122}
1123
ceed1723 1124int gfs2_quota_sync(struct super_block *sb, int type)
b3b94faa 1125{
8c42d637 1126 struct gfs2_sbd *sdp = sb->s_fs_info;
b3b94faa
DT		 1127 struct gfs2_quota_data **qda;
1128 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1129 unsigned int num_qd;
1130 unsigned int x;
1131 int error = 0;
1132
1133 sdp->sd_quota_sync_gen++;
1134
1135 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1136 if (!qda)
1137 return -ENOMEM;
1138
1139 do {
1140 num_qd = 0;
1141
1142 for (;;) {
1143 error = qd_fish(sdp, qda + num_qd);
1144 if (error || !qda[num_qd])
1145 break;
1146 if (++num_qd == max_qd)
1147 break;
1148 }
1149
1150 if (num_qd) {
1151 if (!error)
1152 error = do_sync(num_qd, qda);
1153 if (!error)
1154 for (x = 0; x < num_qd; x++)
1155 qda[x]->qd_sync_gen =
1156 sdp->sd_quota_sync_gen;
1157
1158 for (x = 0; x < num_qd; x++)
1159 qd_unlock(qda[x]);
1160 }
1161 } while (!error && num_qd == max_qd);
1162
1163 kfree(qda);
1164
1165 return error;
1166}
1167
5fb324ad
CH		 1168static int gfs2_quota_sync_timeo(struct super_block *sb, int type)
1169{
ceed1723 1170 return gfs2_quota_sync(sb, type);
5fb324ad
CH		 1171}
1172
cd915493 1173int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
b3b94faa
DT		 1174{
1175 struct gfs2_quota_data *qd;
1176 struct gfs2_holder q_gh;
1177 int error;
1178
6a6ada81 1179 error = qd_get(sdp, user, id, &qd);
b3b94faa
DT		 1180 if (error)
1181 return error;
1182
1183 error = do_glock(qd, FORCE, &q_gh);
1184 if (!error)
1185 gfs2_glock_dq_uninit(&q_gh);
1186
1187 qd_put(qd);
b3b94faa
DT		 1188 return error;
1189}
1190
bb8d8a6f
SW		 1191static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1192{
1193 const struct gfs2_quota_change *str = buf;
1194
1195 qc->qc_change = be64_to_cpu(str->qc_change);
1196 qc->qc_flags = be32_to_cpu(str->qc_flags);
1197 qc->qc_id = be32_to_cpu(str->qc_id);
1198}
1199
b3b94faa
DT		 1200int gfs2_quota_init(struct gfs2_sbd *sdp)
1201{
feaa7bba 1202 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
a2e0f799
SW		 1203 u64 size = i_size_read(sdp->sd_qc_inode);
1204 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
b3b94faa
DT		 1205 unsigned int x, slot = 0;
1206 unsigned int found = 0;
cd915493
SW		 1207 u64 dblock;
1208 u32 extlen = 0;
b3b94faa
DT		 1209 int error;
1210
a2e0f799 1211 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
907b9bce 1212 return -EIO;
a2e0f799 1213
b3b94faa 1214 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
5c676f6d 1215 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
b3b94faa
DT		 1216
1217 error = -ENOMEM;
1218
1219 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
16c5f06f 1220 sizeof(unsigned char *), GFP_NOFS);
b3b94faa
DT		 1221 if (!sdp->sd_quota_bitmap)
1222 return error;
1223
1224 for (x = 0; x < sdp->sd_quota_chunks; x++) {
16c5f06f 1225 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
b3b94faa
DT		 1226 if (!sdp->sd_quota_bitmap[x])
1227 goto fail;
1228 }
1229
1230 for (x = 0; x < blocks; x++) {
1231 struct buffer_head *bh;
1232 unsigned int y;
1233
1234 if (!extlen) {
1235 int new = 0;
feaa7bba 1236 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
b3b94faa
DT		 1237 if (error)
1238 goto fail;
1239 }
b3b94faa 1240 error = -EIO;
7276b3b0
SW		 1241 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1242 if (!bh)
1243 goto fail;
b3b94faa
DT		 1244 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1245 brelse(bh);
1246 goto fail;
1247 }
1248
7276b3b0 1249 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
b3b94faa 1250 y++, slot++) {
b62f963e 1251 struct gfs2_quota_change_host qc;
b3b94faa
DT		 1252 struct gfs2_quota_data *qd;
1253
1254 gfs2_quota_change_in(&qc, bh->b_data +
1255 sizeof(struct gfs2_meta_header) +
1256 y * sizeof(struct gfs2_quota_change));
1257 if (!qc.qc_change)
1258 continue;
1259
1260 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1261 qc.qc_id, &qd);
1262 if (error) {
1263 brelse(bh);
1264 goto fail;
1265 }
1266
1267 set_bit(QDF_CHANGE, &qd->qd_flags);
1268 qd->qd_change = qc.qc_change;
1269 qd->qd_slot = slot;
1270 qd->qd_slot_count = 1;
b3b94faa 1271
0a7ab79c 1272 spin_lock(&qd_lru_lock);
b3b94faa
DT		 1273 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1274 list_add(&qd->qd_list, &sdp->sd_quota_list);
1275 atomic_inc(&sdp->sd_quota_count);
0a7ab79c 1276 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 1277
1278 found++;
1279 }
1280
1281 brelse(bh);
1282 dblock++;
1283 extlen--;
1284 }
1285
1286 if (found)
1287 fs_info(sdp, "found %u quota changes\n", found);
1288
1289 return 0;
1290
a91ea69f 1291fail:
b3b94faa
DT		 1292 gfs2_quota_cleanup(sdp);
1293 return error;
1294}
1295
b3b94faa
DT		 1296void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1297{
1298 struct list_head *head = &sdp->sd_quota_list;
1299 struct gfs2_quota_data *qd;
1300 unsigned int x;
1301
0a7ab79c 1302 spin_lock(&qd_lru_lock);
b3b94faa
DT		 1303 while (!list_empty(head)) {
1304 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1305
0a7ab79c
AD		 1306 if (atomic_read(&qd->qd_count) > 1 ||
1307 (atomic_read(&qd->qd_count) &&
1308 !test_bit(QDF_CHANGE, &qd->qd_flags))) {
0a7ab79c
AD		 1309 list_move(&qd->qd_list, head);
1310 spin_unlock(&qd_lru_lock);
b3b94faa 1311 schedule();
0a7ab79c 1312 spin_lock(&qd_lru_lock);
b3b94faa
DT		 1313 continue;
1314 }
1315
1316 list_del(&qd->qd_list);
0a7ab79c
AD		 1317 /* Also remove if this qd exists in the reclaim list */
1318 if (!list_empty(&qd->qd_reclaim)) {
1319 list_del_init(&qd->qd_reclaim);
1320 atomic_dec(&qd_lru_count);
1321 }
b3b94faa 1322 atomic_dec(&sdp->sd_quota_count);
0a7ab79c 1323 spin_unlock(&qd_lru_lock);
b3b94faa 1324
0a7ab79c 1325 if (!atomic_read(&qd->qd_count)) {
b3b94faa
DT		 1326 gfs2_assert_warn(sdp, !qd->qd_change);
1327 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1328 } else
1329 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1330 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1331
f057f6cd 1332 gfs2_glock_put(qd->qd_gl);
37b2c837 1333 kmem_cache_free(gfs2_quotad_cachep, qd);
b3b94faa 1334
0a7ab79c 1335 spin_lock(&qd_lru_lock);
b3b94faa 1336 }
0a7ab79c 1337 spin_unlock(&qd_lru_lock);
b3b94faa
DT		 1338
1339 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1340
1341 if (sdp->sd_quota_bitmap) {
1342 for (x = 0; x < sdp->sd_quota_chunks; x++)
1343 kfree(sdp->sd_quota_bitmap[x]);
1344 kfree(sdp->sd_quota_bitmap);
1345 }
1346}
1347
37b2c837
SW		 1348static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1349{
1350 if (error == 0 || error == -EROFS)
1351 return;
1352 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1353 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1354}
1355
1356static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
8c42d637 1357 int (*fxn)(struct super_block *sb, int type),
37b2c837
SW		 1358 unsigned long t, unsigned long *timeo,
1359 unsigned int *new_timeo)
1360{
1361 if (t >= *timeo) {
8c42d637 1362 int error = fxn(sdp->sd_vfs, 0);
37b2c837
SW		 1363 quotad_error(sdp, msg, error);
1364 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1365 } else {
1366 *timeo -= t;
1367 }
1368}
1369
813e0c46
SW		 1370static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1371{
1372 struct gfs2_inode *ip;
1373
1374 while(1) {
1375 ip = NULL;
1376 spin_lock(&sdp->sd_trunc_lock);
1377 if (!list_empty(&sdp->sd_trunc_list)) {
1378 ip = list_entry(sdp->sd_trunc_list.next,
1379 struct gfs2_inode, i_trunc_list);
1380 list_del_init(&ip->i_trunc_list);
1381 }
1382 spin_unlock(&sdp->sd_trunc_lock);
1383 if (ip == NULL)
1384 return;
1385 gfs2_glock_finish_truncate(ip);
1386 }
1387}
1388
3d3c10f2
BM		 1389void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1390 if (!sdp->sd_statfs_force_sync) {
1391 sdp->sd_statfs_force_sync = 1;
1392 wake_up(&sdp->sd_quota_wait);
1393 }
1394}
1395
1396
37b2c837
SW		 1397/**
1398 * gfs2_quotad - Write cached quota changes into the quota file
1399 * @sdp: Pointer to GFS2 superblock
1400 *
1401 */
1402
1403int gfs2_quotad(void *data)
1404{
1405 struct gfs2_sbd *sdp = data;
1406 struct gfs2_tune *tune = &sdp->sd_tune;
1407 unsigned long statfs_timeo = 0;
1408 unsigned long quotad_timeo = 0;
1409 unsigned long t = 0;
1410 DEFINE_WAIT(wait);
813e0c46 1411 int empty;
37b2c837
SW		 1412
1413 while (!kthread_should_stop()) {
1414
1415 /* Update the master statfs file */
3d3c10f2
BM		 1416 if (sdp->sd_statfs_force_sync) {
1417 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1418 quotad_error(sdp, "statfs", error);
1419 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1420 }
1421 else
1422 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1423 &statfs_timeo,
1424 &tune->gt_statfs_quantum);
37b2c837
SW		 1425
1426 /* Update quota file */
5fb324ad 1427 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t,
37b2c837
SW		 1428 &quotad_timeo, &tune->gt_quota_quantum);
1429
813e0c46
SW		 1430 /* Check for & recover partially truncated inodes */
1431 quotad_check_trunc_list(sdp);
1432
a0acae0e
TH		 1433 try_to_freeze();
1434
37b2c837
SW		 1435 t = min(quotad_timeo, statfs_timeo);
1436
7fa5d20d 1437 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
813e0c46
SW		 1438 spin_lock(&sdp->sd_trunc_lock);
1439 empty = list_empty(&sdp->sd_trunc_list);
1440 spin_unlock(&sdp->sd_trunc_lock);
3d3c10f2 1441 if (empty && !sdp->sd_statfs_force_sync)
813e0c46
SW		 1442 t -= schedule_timeout(t);
1443 else
1444 t = 0;
37b2c837
SW		 1445 finish_wait(&sdp->sd_quota_wait, &wait);
1446 }
1447
1448 return 0;
1449}
1450
1d371b5e
SW		 1451static int gfs2_quota_get_xstate(struct super_block *sb,
1452 struct fs_quota_stat *fqs)
1453{
1454 struct gfs2_sbd *sdp = sb->s_fs_info;
1455
1456 memset(fqs, 0, sizeof(struct fs_quota_stat));
1457 fqs->qs_version = FS_QSTAT_VERSION;
ad6bb90f
CH		 1458
1459 switch (sdp->sd_args.ar_quota) {
1460 case GFS2_QUOTA_ON:
ade7ce31 1461 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
ad6bb90f
CH		 1462 /*FALLTHRU*/
1463 case GFS2_QUOTA_ACCOUNT:
ade7ce31 1464 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
ad6bb90f
CH		 1465 break;
1466 case GFS2_QUOTA_OFF:
1467 break;
1468 }
1469
1d371b5e
SW		 1470 if (sdp->sd_quota_inode) {
1471 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1472 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1473 }
1474 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1475 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1476 fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1477 return 0;
1478}
1479
74a8a103 1480static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
b9b2dd36 1481 struct fs_disk_quota *fdq)
113d6b3c
SW		 1482{
1483 struct gfs2_sbd *sdp = sb->s_fs_info;
1484 struct gfs2_quota_lvb *qlvb;
1485 struct gfs2_quota_data *qd;
1486 struct gfs2_holder q_gh;
1487 int error;
74a8a103 1488 int type;
113d6b3c
SW		 1489
1490 memset(fdq, 0, sizeof(struct fs_disk_quota));
1491
1492 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1493 return -ESRCH; /* Crazy XFS error code */
1494
74a8a103 1495 if (qid.type == USRQUOTA)
113d6b3c 1496 type = QUOTA_USER;
74a8a103 1497 else if (qid.type == GRPQUOTA)
113d6b3c
SW		 1498 type = QUOTA_GROUP;
1499 else
1500 return -EINVAL;
1501
74a8a103 1502 error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
113d6b3c
SW		 1503 if (error)
1504 return error;
1505 error = do_glock(qd, FORCE, &q_gh);
1506 if (error)
1507 goto out;
1508
4e2f8849 1509 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
113d6b3c 1510 fdq->d_version = FS_DQUOT_VERSION;
ade7ce31 1511 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
74a8a103 1512 fdq->d_id = from_kqid(&init_user_ns, qid);
14870b45
AD		 1513 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1514 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1515 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
113d6b3c
SW		 1516
1517 gfs2_glock_dq_uninit(&q_gh);
1518out:
1519 qd_put(qd);
1520 return error;
1521}
1522
e285c100 1523/* GFS2 only supports a subset of the XFS fields */
802ec9b6 1524#define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
e285c100 1525
74a8a103 1526static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
c472b432 1527 struct fs_disk_quota *fdq)
e285c100
SW		 1528{
1529 struct gfs2_sbd *sdp = sb->s_fs_info;
1530 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1531 struct gfs2_quota_data *qd;
1532 struct gfs2_holder q_gh, i_gh;
1533 unsigned int data_blocks, ind_blocks;
1534 unsigned int blocks = 0;
1535 int alloc_required;
e285c100
SW		 1536 loff_t offset;
1537 int error;
74a8a103 1538 int type;
e285c100
SW		 1539
1540 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1541 return -ESRCH; /* Crazy XFS error code */
1542
74a8a103 1543 switch(qid.type) {
e285c100
SW		 1544 case USRQUOTA:
1545 type = QUOTA_USER;
ade7ce31 1546 if (fdq->d_flags != FS_USER_QUOTA)
e285c100
SW		 1547 return -EINVAL;
1548 break;
1549 case GRPQUOTA:
1550 type = QUOTA_GROUP;
ade7ce31 1551 if (fdq->d_flags != FS_GROUP_QUOTA)
e285c100
SW		 1552 return -EINVAL;
1553 break;
1554 default:
1555 return -EINVAL;
1556 }
1557
1558 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1559 return -EINVAL;
74a8a103 1560 if (fdq->d_id != from_kqid(&init_user_ns, qid))
e285c100
SW		 1561 return -EINVAL;
1562
74a8a103 1563 error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd);
e285c100
SW		 1564 if (error)
1565 return error;
1566
0a305e49
BP		 1567 error = gfs2_rs_alloc(ip);
1568 if (error)
1569 goto out_put;
1570
e285c100
SW		 1571 mutex_lock(&ip->i_inode.i_mutex);
1572 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1573 if (error)
0a305e49 1574 goto out_unlockput;
e285c100
SW		 1575 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1576 if (error)
1577 goto out_q;
1578
1579 /* Check for existing entry, if none then alloc new blocks */
1580 error = update_qd(sdp, qd);
1581 if (error)
1582 goto out_i;
1583
1584 /* If nothing has changed, this is a no-op */
1585 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
14870b45 1586 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
e285c100 1587 fdq->d_fieldmask ^= FS_DQ_BSOFT;
802ec9b6 1588
e285c100 1589 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
14870b45 1590 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
e285c100 1591 fdq->d_fieldmask ^= FS_DQ_BHARD;
802ec9b6
AD		 1592
1593 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1594 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1595 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1596
e285c100
SW		 1597 if (fdq->d_fieldmask == 0)
1598 goto out_i;
1599
1600 offset = qd2offset(qd);
461cb419 1601 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
e79a46a0
AD		 1602 if (gfs2_is_stuffed(ip))
1603 alloc_required = 1;
e285c100 1604 if (alloc_required) {
e285c100
SW		 1605 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1606 &data_blocks, &ind_blocks);
564e12b1 1607 blocks = 1 + data_blocks + ind_blocks;
9dbe9610 1608 error = gfs2_inplace_reserve(ip, blocks, 0);
e285c100 1609 if (error)
564e12b1 1610 goto out_i;
71f890f7 1611 blocks += gfs2_rg_blocks(ip, blocks);
e285c100
SW		 1612 }
1613
e79a46a0
AD		 1614 /* Some quotas span block boundaries and can update two blocks,
1615 adding an extra block to the transaction to handle such quotas */
1616 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
e285c100
SW		 1617 if (error)
1618 goto out_release;
1619
1620 /* Apply changes */
1621 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1622
1623 gfs2_trans_end(sdp);
1624out_release:
564e12b1 1625 if (alloc_required)
e285c100 1626 gfs2_inplace_release(ip);
e285c100
SW		 1627out_i:
1628 gfs2_glock_dq_uninit(&i_gh);
1629out_q:
1630 gfs2_glock_dq_uninit(&q_gh);
0a305e49 1631out_unlockput:
e285c100 1632 mutex_unlock(&ip->i_inode.i_mutex);
0a305e49 1633out_put:
e285c100
SW		 1634 qd_put(qd);
1635 return error;
1636}
1637
cc632e7f
SW		 1638const struct quotactl_ops gfs2_quotactl_ops = {
1639 .quota_sync = gfs2_quota_sync,
1d371b5e 1640 .get_xstate = gfs2_quota_get_xstate,
b9b2dd36 1641 .get_dqblk = gfs2_get_dqblk,
c472b432 1642 .set_dqblk = gfs2_set_dqblk,
cc632e7f 1643};
kernel source for telekom puls (alcatel/mediatek)