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GFS2: Use pr_<level> more consistently
[deliverable/linux.git] / fs / gfs2 / quota.c
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 /*
11 * Quota change tags are associated with each transaction that allocates or
12 * deallocates space. Those changes are accumulated locally to each node (in a
13 * per-node file) and then are periodically synced to the quota file. This
14 * avoids the bottleneck of constantly touching the quota file, but introduces
15 * fuzziness in the current usage value of IDs that are being used on different
16 * nodes in the cluster simultaneously. So, it is possible for a user on
17 * multiple nodes to overrun their quota, but that overrun is controlable.
18 * Since quota tags are part of transactions, there is no need for a quota check
19 * program to be run on node crashes or anything like that.
20 *
21 * There are couple of knobs that let the administrator manage the quota
22 * fuzziness. "quota_quantum" sets the maximum time a quota change can be
23 * sitting on one node before being synced to the quota file. (The default is
24 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency
25 * of quota file syncs increases as the user moves closer to their limit. The
26 * more frequent the syncs, the more accurate the quota enforcement, but that
27 * means that there is more contention between the nodes for the quota file.
28 * The default value is one. This sets the maximum theoretical quota overrun
29 * (with infinite node with infinite bandwidth) to twice the user's limit. (In
30 * practice, the maximum overrun you see should be much less.) A "quota_scale"
31 * number greater than one makes quota syncs more frequent and reduces the
32 * maximum overrun. Numbers less than one (but greater than zero) make quota
33 * syncs less frequent.
34 *
35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
36 * the quota file, so it is not being constantly read.
37 */
38
39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40
41 #include <linux/sched.h>
42 #include <linux/slab.h>
43 #include <linux/mm.h>
44 #include <linux/spinlock.h>
45 #include <linux/completion.h>
46 #include <linux/buffer_head.h>
47 #include <linux/sort.h>
48 #include <linux/fs.h>
49 #include <linux/bio.h>
50 #include <linux/gfs2_ondisk.h>
51 #include <linux/kthread.h>
52 #include <linux/freezer.h>
53 #include <linux/quota.h>
54 #include <linux/dqblk_xfs.h>
55 #include <linux/lockref.h>
56 #include <linux/list_lru.h>
57 #include <linux/rcupdate.h>
58 #include <linux/rculist_bl.h>
59 #include <linux/bit_spinlock.h>
60 #include <linux/jhash.h>
61 #include <linux/vmalloc.h>
62
63 #include "gfs2.h"
64 #include "incore.h"
65 #include "bmap.h"
66 #include "glock.h"
67 #include "glops.h"
68 #include "log.h"
69 #include "meta_io.h"
70 #include "quota.h"
71 #include "rgrp.h"
72 #include "super.h"
73 #include "trans.h"
74 #include "inode.h"
75 #include "util.h"
76
77 #define GFS2_QD_HASH_SHIFT 12
78 #define GFS2_QD_HASH_SIZE (1 << GFS2_QD_HASH_SHIFT)
79 #define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1)
80
81 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
82 /* -> sd_bitmap_lock */
83 static DEFINE_SPINLOCK(qd_lock);
84 struct list_lru gfs2_qd_lru;
85
86 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
87
88 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
89 const struct kqid qid)
90 {
91 unsigned int h;
92
93 h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
94 h = jhash(&qid, sizeof(struct kqid), h);
95
96 return h & GFS2_QD_HASH_MASK;
97 }
98
99 static inline void spin_lock_bucket(unsigned int hash)
100 {
101 hlist_bl_lock(&qd_hash_table[hash]);
102 }
103
104 static inline void spin_unlock_bucket(unsigned int hash)
105 {
106 hlist_bl_unlock(&qd_hash_table[hash]);
107 }
108
109 static void gfs2_qd_dealloc(struct rcu_head *rcu)
110 {
111 struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
112 kmem_cache_free(gfs2_quotad_cachep, qd);
113 }
114
115 static void gfs2_qd_dispose(struct list_head *list)
116 {
117 struct gfs2_quota_data *qd;
118 struct gfs2_sbd *sdp;
119
120 while (!list_empty(list)) {
121 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
122 sdp = qd->qd_gl->gl_sbd;
123
124 list_del(&qd->qd_lru);
125
126 /* Free from the filesystem-specific list */
127 spin_lock(&qd_lock);
128 list_del(&qd->qd_list);
129 spin_unlock(&qd_lock);
130
131 spin_lock_bucket(qd->qd_hash);
132 hlist_bl_del_rcu(&qd->qd_hlist);
133 spin_unlock_bucket(qd->qd_hash);
134
135 gfs2_assert_warn(sdp, !qd->qd_change);
136 gfs2_assert_warn(sdp, !qd->qd_slot_count);
137 gfs2_assert_warn(sdp, !qd->qd_bh_count);
138
139 gfs2_glock_put(qd->qd_gl);
140 atomic_dec(&sdp->sd_quota_count);
141
142 /* Delete it from the common reclaim list */
143 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
144 }
145 }
146
147
148 static enum lru_status gfs2_qd_isolate(struct list_head *item, spinlock_t *lock, void *arg)
149 {
150 struct list_head *dispose = arg;
151 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
152
153 if (!spin_trylock(&qd->qd_lockref.lock))
154 return LRU_SKIP;
155
156 if (qd->qd_lockref.count == 0) {
157 lockref_mark_dead(&qd->qd_lockref);
158 list_move(&qd->qd_lru, dispose);
159 }
160
161 spin_unlock(&qd->qd_lockref.lock);
162 return LRU_REMOVED;
163 }
164
165 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
166 struct shrink_control *sc)
167 {
168 LIST_HEAD(dispose);
169 unsigned long freed;
170
171 if (!(sc->gfp_mask & __GFP_FS))
172 return SHRINK_STOP;
173
174 freed = list_lru_walk_node(&gfs2_qd_lru, sc->nid, gfs2_qd_isolate,
175 &dispose, &sc->nr_to_scan);
176
177 gfs2_qd_dispose(&dispose);
178
179 return freed;
180 }
181
182 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
183 struct shrink_control *sc)
184 {
185 return vfs_pressure_ratio(list_lru_count_node(&gfs2_qd_lru, sc->nid));
186 }
187
188 struct shrinker gfs2_qd_shrinker = {
189 .count_objects = gfs2_qd_shrink_count,
190 .scan_objects = gfs2_qd_shrink_scan,
191 .seeks = DEFAULT_SEEKS,
192 .flags = SHRINKER_NUMA_AWARE,
193 };
194
195
196 static u64 qd2index(struct gfs2_quota_data *qd)
197 {
198 struct kqid qid = qd->qd_id;
199 return (2 * (u64)from_kqid(&init_user_ns, qid)) +
200 ((qid.type == USRQUOTA) ? 0 : 1);
201 }
202
203 static u64 qd2offset(struct gfs2_quota_data *qd)
204 {
205 u64 offset;
206
207 offset = qd2index(qd);
208 offset *= sizeof(struct gfs2_quota);
209
210 return offset;
211 }
212
213 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
214 {
215 struct gfs2_quota_data *qd;
216 int error;
217
218 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
219 if (!qd)
220 return NULL;
221
222 qd->qd_sbd = sdp;
223 qd->qd_lockref.count = 1;
224 spin_lock_init(&qd->qd_lockref.lock);
225 qd->qd_id = qid;
226 qd->qd_slot = -1;
227 INIT_LIST_HEAD(&qd->qd_lru);
228 qd->qd_hash = hash;
229
230 error = gfs2_glock_get(sdp, qd2index(qd),
231 &gfs2_quota_glops, CREATE, &qd->qd_gl);
232 if (error)
233 goto fail;
234
235 return qd;
236
237 fail:
238 kmem_cache_free(gfs2_quotad_cachep, qd);
239 return NULL;
240 }
241
242 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
243 const struct gfs2_sbd *sdp,
244 struct kqid qid)
245 {
246 struct gfs2_quota_data *qd;
247 struct hlist_bl_node *h;
248
249 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
250 if (!qid_eq(qd->qd_id, qid))
251 continue;
252 if (qd->qd_sbd != sdp)
253 continue;
254 if (lockref_get_not_dead(&qd->qd_lockref)) {
255 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
256 return qd;
257 }
258 }
259
260 return NULL;
261 }
262
263
264 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
265 struct gfs2_quota_data **qdp)
266 {
267 struct gfs2_quota_data *qd, *new_qd;
268 unsigned int hash = gfs2_qd_hash(sdp, qid);
269
270 rcu_read_lock();
271 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
272 rcu_read_unlock();
273
274 if (qd)
275 return 0;
276
277 new_qd = qd_alloc(hash, sdp, qid);
278 if (!new_qd)
279 return -ENOMEM;
280
281 spin_lock(&qd_lock);
282 spin_lock_bucket(hash);
283 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
284 if (qd == NULL) {
285 *qdp = new_qd;
286 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
287 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
288 atomic_inc(&sdp->sd_quota_count);
289 }
290 spin_unlock_bucket(hash);
291 spin_unlock(&qd_lock);
292
293 if (qd) {
294 gfs2_glock_put(new_qd->qd_gl);
295 kmem_cache_free(gfs2_quotad_cachep, new_qd);
296 }
297
298 return 0;
299 }
300
301
302 static void qd_hold(struct gfs2_quota_data *qd)
303 {
304 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
305 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
306 lockref_get(&qd->qd_lockref);
307 }
308
309 static void qd_put(struct gfs2_quota_data *qd)
310 {
311 if (lockref_put_or_lock(&qd->qd_lockref))
312 return;
313
314 qd->qd_lockref.count = 0;
315 list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
316 spin_unlock(&qd->qd_lockref.lock);
317
318 }
319
320 static int slot_get(struct gfs2_quota_data *qd)
321 {
322 struct gfs2_sbd *sdp = qd->qd_sbd;
323 unsigned int bit;
324 int error = 0;
325
326 spin_lock(&sdp->sd_bitmap_lock);
327 if (qd->qd_slot_count != 0)
328 goto out;
329
330 error = -ENOSPC;
331 bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
332 if (bit < sdp->sd_quota_slots) {
333 set_bit(bit, sdp->sd_quota_bitmap);
334 qd->qd_slot = bit;
335 out:
336 qd->qd_slot_count++;
337 }
338 spin_unlock(&sdp->sd_bitmap_lock);
339
340 return error;
341 }
342
343 static void slot_hold(struct gfs2_quota_data *qd)
344 {
345 struct gfs2_sbd *sdp = qd->qd_sbd;
346
347 spin_lock(&sdp->sd_bitmap_lock);
348 gfs2_assert(sdp, qd->qd_slot_count);
349 qd->qd_slot_count++;
350 spin_unlock(&sdp->sd_bitmap_lock);
351 }
352
353 static void slot_put(struct gfs2_quota_data *qd)
354 {
355 struct gfs2_sbd *sdp = qd->qd_sbd;
356
357 spin_lock(&sdp->sd_bitmap_lock);
358 gfs2_assert(sdp, qd->qd_slot_count);
359 if (!--qd->qd_slot_count) {
360 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
361 qd->qd_slot = -1;
362 }
363 spin_unlock(&sdp->sd_bitmap_lock);
364 }
365
366 static int bh_get(struct gfs2_quota_data *qd)
367 {
368 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
369 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
370 unsigned int block, offset;
371 struct buffer_head *bh;
372 int error;
373 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
374
375 mutex_lock(&sdp->sd_quota_mutex);
376
377 if (qd->qd_bh_count++) {
378 mutex_unlock(&sdp->sd_quota_mutex);
379 return 0;
380 }
381
382 block = qd->qd_slot / sdp->sd_qc_per_block;
383 offset = qd->qd_slot % sdp->sd_qc_per_block;
384
385 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
386 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
387 if (error)
388 goto fail;
389 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
390 if (error)
391 goto fail;
392 error = -EIO;
393 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
394 goto fail_brelse;
395
396 qd->qd_bh = bh;
397 qd->qd_bh_qc = (struct gfs2_quota_change *)
398 (bh->b_data + sizeof(struct gfs2_meta_header) +
399 offset * sizeof(struct gfs2_quota_change));
400
401 mutex_unlock(&sdp->sd_quota_mutex);
402
403 return 0;
404
405 fail_brelse:
406 brelse(bh);
407 fail:
408 qd->qd_bh_count--;
409 mutex_unlock(&sdp->sd_quota_mutex);
410 return error;
411 }
412
413 static void bh_put(struct gfs2_quota_data *qd)
414 {
415 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
416
417 mutex_lock(&sdp->sd_quota_mutex);
418 gfs2_assert(sdp, qd->qd_bh_count);
419 if (!--qd->qd_bh_count) {
420 brelse(qd->qd_bh);
421 qd->qd_bh = NULL;
422 qd->qd_bh_qc = NULL;
423 }
424 mutex_unlock(&sdp->sd_quota_mutex);
425 }
426
427 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
428 u64 *sync_gen)
429 {
430 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
431 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
432 (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
433 return 0;
434
435 if (!lockref_get_not_dead(&qd->qd_lockref))
436 return 0;
437
438 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
439 set_bit(QDF_LOCKED, &qd->qd_flags);
440 qd->qd_change_sync = qd->qd_change;
441 slot_hold(qd);
442 return 1;
443 }
444
445 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
446 {
447 struct gfs2_quota_data *qd = NULL;
448 int error;
449 int found = 0;
450
451 *qdp = NULL;
452
453 if (sdp->sd_vfs->s_flags & MS_RDONLY)
454 return 0;
455
456 spin_lock(&qd_lock);
457
458 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
459 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
460 if (found)
461 break;
462 }
463
464 if (!found)
465 qd = NULL;
466
467 spin_unlock(&qd_lock);
468
469 if (qd) {
470 gfs2_assert_warn(sdp, qd->qd_change_sync);
471 error = bh_get(qd);
472 if (error) {
473 clear_bit(QDF_LOCKED, &qd->qd_flags);
474 slot_put(qd);
475 qd_put(qd);
476 return error;
477 }
478 }
479
480 *qdp = qd;
481
482 return 0;
483 }
484
485 static void qd_unlock(struct gfs2_quota_data *qd)
486 {
487 gfs2_assert_warn(qd->qd_gl->gl_sbd,
488 test_bit(QDF_LOCKED, &qd->qd_flags));
489 clear_bit(QDF_LOCKED, &qd->qd_flags);
490 bh_put(qd);
491 slot_put(qd);
492 qd_put(qd);
493 }
494
495 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
496 struct gfs2_quota_data **qdp)
497 {
498 int error;
499
500 error = qd_get(sdp, qid, qdp);
501 if (error)
502 return error;
503
504 error = slot_get(*qdp);
505 if (error)
506 goto fail;
507
508 error = bh_get(*qdp);
509 if (error)
510 goto fail_slot;
511
512 return 0;
513
514 fail_slot:
515 slot_put(*qdp);
516 fail:
517 qd_put(*qdp);
518 return error;
519 }
520
521 static void qdsb_put(struct gfs2_quota_data *qd)
522 {
523 bh_put(qd);
524 slot_put(qd);
525 qd_put(qd);
526 }
527
528 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
529 {
530 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
531 struct gfs2_quota_data **qd;
532 int error;
533
534 if (ip->i_res == NULL) {
535 error = gfs2_rs_alloc(ip);
536 if (error)
537 return error;
538 }
539
540 qd = ip->i_res->rs_qa_qd;
541
542 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
543 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
544 return -EIO;
545
546 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
547 return 0;
548
549 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
550 if (error)
551 goto out;
552 ip->i_res->rs_qa_qd_num++;
553 qd++;
554
555 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
556 if (error)
557 goto out;
558 ip->i_res->rs_qa_qd_num++;
559 qd++;
560
561 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
562 !uid_eq(uid, ip->i_inode.i_uid)) {
563 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
564 if (error)
565 goto out;
566 ip->i_res->rs_qa_qd_num++;
567 qd++;
568 }
569
570 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
571 !gid_eq(gid, ip->i_inode.i_gid)) {
572 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
573 if (error)
574 goto out;
575 ip->i_res->rs_qa_qd_num++;
576 qd++;
577 }
578
579 out:
580 if (error)
581 gfs2_quota_unhold(ip);
582 return error;
583 }
584
585 void gfs2_quota_unhold(struct gfs2_inode *ip)
586 {
587 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
588 unsigned int x;
589
590 if (ip->i_res == NULL)
591 return;
592 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
593
594 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
595 qdsb_put(ip->i_res->rs_qa_qd[x]);
596 ip->i_res->rs_qa_qd[x] = NULL;
597 }
598 ip->i_res->rs_qa_qd_num = 0;
599 }
600
601 static int sort_qd(const void *a, const void *b)
602 {
603 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
604 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
605
606 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
607 return -1;
608 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
609 return 1;
610 return 0;
611 }
612
613 static void do_qc(struct gfs2_quota_data *qd, s64 change)
614 {
615 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
616 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
617 struct gfs2_quota_change *qc = qd->qd_bh_qc;
618 s64 x;
619
620 mutex_lock(&sdp->sd_quota_mutex);
621 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
622
623 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
624 qc->qc_change = 0;
625 qc->qc_flags = 0;
626 if (qd->qd_id.type == USRQUOTA)
627 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
628 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
629 }
630
631 x = be64_to_cpu(qc->qc_change) + change;
632 qc->qc_change = cpu_to_be64(x);
633
634 spin_lock(&qd_lock);
635 qd->qd_change = x;
636 spin_unlock(&qd_lock);
637
638 if (!x) {
639 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
640 clear_bit(QDF_CHANGE, &qd->qd_flags);
641 qc->qc_flags = 0;
642 qc->qc_id = 0;
643 slot_put(qd);
644 qd_put(qd);
645 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
646 qd_hold(qd);
647 slot_hold(qd);
648 }
649
650 mutex_unlock(&sdp->sd_quota_mutex);
651 }
652
653 /**
654 * gfs2_adjust_quota - adjust record of current block usage
655 * @ip: The quota inode
656 * @loc: Offset of the entry in the quota file
657 * @change: The amount of usage change to record
658 * @qd: The quota data
659 * @fdq: The updated limits to record
660 *
661 * This function was mostly borrowed from gfs2_block_truncate_page which was
662 * in turn mostly borrowed from ext3
663 *
664 * Returns: 0 or -ve on error
665 */
666
667 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
668 s64 change, struct gfs2_quota_data *qd,
669 struct fs_disk_quota *fdq)
670 {
671 struct inode *inode = &ip->i_inode;
672 struct gfs2_sbd *sdp = GFS2_SB(inode);
673 struct address_space *mapping = inode->i_mapping;
674 unsigned long index = loc >> PAGE_CACHE_SHIFT;
675 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
676 unsigned blocksize, iblock, pos;
677 struct buffer_head *bh;
678 struct page *page;
679 void *kaddr, *ptr;
680 struct gfs2_quota q;
681 int err, nbytes;
682 u64 size;
683
684 if (gfs2_is_stuffed(ip)) {
685 err = gfs2_unstuff_dinode(ip, NULL);
686 if (err)
687 return err;
688 }
689
690 memset(&q, 0, sizeof(struct gfs2_quota));
691 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
692 if (err < 0)
693 return err;
694
695 err = -EIO;
696 be64_add_cpu(&q.qu_value, change);
697 qd->qd_qb.qb_value = q.qu_value;
698 if (fdq) {
699 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
700 q.qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
701 qd->qd_qb.qb_warn = q.qu_warn;
702 }
703 if (fdq->d_fieldmask & FS_DQ_BHARD) {
704 q.qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
705 qd->qd_qb.qb_limit = q.qu_limit;
706 }
707 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
708 q.qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
709 qd->qd_qb.qb_value = q.qu_value;
710 }
711 }
712
713 /* Write the quota into the quota file on disk */
714 ptr = &q;
715 nbytes = sizeof(struct gfs2_quota);
716 get_a_page:
717 page = find_or_create_page(mapping, index, GFP_NOFS);
718 if (!page)
719 return -ENOMEM;
720
721 blocksize = inode->i_sb->s_blocksize;
722 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
723
724 if (!page_has_buffers(page))
725 create_empty_buffers(page, blocksize, 0);
726
727 bh = page_buffers(page);
728 pos = blocksize;
729 while (offset >= pos) {
730 bh = bh->b_this_page;
731 iblock++;
732 pos += blocksize;
733 }
734
735 if (!buffer_mapped(bh)) {
736 gfs2_block_map(inode, iblock, bh, 1);
737 if (!buffer_mapped(bh))
738 goto unlock_out;
739 /* If it's a newly allocated disk block for quota, zero it */
740 if (buffer_new(bh))
741 zero_user(page, pos - blocksize, bh->b_size);
742 }
743
744 if (PageUptodate(page))
745 set_buffer_uptodate(bh);
746
747 if (!buffer_uptodate(bh)) {
748 ll_rw_block(READ | REQ_META, 1, &bh);
749 wait_on_buffer(bh);
750 if (!buffer_uptodate(bh))
751 goto unlock_out;
752 }
753
754 gfs2_trans_add_data(ip->i_gl, bh);
755
756 kaddr = kmap_atomic(page);
757 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
758 nbytes = PAGE_CACHE_SIZE - offset;
759 memcpy(kaddr + offset, ptr, nbytes);
760 flush_dcache_page(page);
761 kunmap_atomic(kaddr);
762 unlock_page(page);
763 page_cache_release(page);
764
765 /* If quota straddles page boundary, we need to update the rest of the
766 * quota at the beginning of the next page */
767 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
768 ptr = ptr + nbytes;
769 nbytes = sizeof(struct gfs2_quota) - nbytes;
770 offset = 0;
771 index++;
772 goto get_a_page;
773 }
774
775 size = loc + sizeof(struct gfs2_quota);
776 if (size > inode->i_size)
777 i_size_write(inode, size);
778 inode->i_mtime = inode->i_atime = CURRENT_TIME;
779 mark_inode_dirty(inode);
780 return 0;
781
782 unlock_out:
783 unlock_page(page);
784 page_cache_release(page);
785 return err;
786 }
787
788 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
789 {
790 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
791 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
792 struct gfs2_alloc_parms ap = { .aflags = 0, };
793 unsigned int data_blocks, ind_blocks;
794 struct gfs2_holder *ghs, i_gh;
795 unsigned int qx, x;
796 struct gfs2_quota_data *qd;
797 unsigned reserved;
798 loff_t offset;
799 unsigned int nalloc = 0, blocks;
800 int error;
801
802 error = gfs2_rs_alloc(ip);
803 if (error)
804 return error;
805
806 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
807 &data_blocks, &ind_blocks);
808
809 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
810 if (!ghs)
811 return -ENOMEM;
812
813 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
814 mutex_lock(&ip->i_inode.i_mutex);
815 for (qx = 0; qx < num_qd; qx++) {
816 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
817 GL_NOCACHE, &ghs[qx]);
818 if (error)
819 goto out;
820 }
821
822 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
823 if (error)
824 goto out;
825
826 for (x = 0; x < num_qd; x++) {
827 offset = qd2offset(qda[x]);
828 if (gfs2_write_alloc_required(ip, offset,
829 sizeof(struct gfs2_quota)))
830 nalloc++;
831 }
832
833 /*
834 * 1 blk for unstuffing inode if stuffed. We add this extra
835 * block to the reservation unconditionally. If the inode
836 * doesn't need unstuffing, the block will be released to the
837 * rgrp since it won't be allocated during the transaction
838 */
839 /* +3 in the end for unstuffing block, inode size update block
840 * and another block in case quota straddles page boundary and
841 * two blocks need to be updated instead of 1 */
842 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
843
844 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
845 ap.target = reserved;
846 error = gfs2_inplace_reserve(ip, &ap);
847 if (error)
848 goto out_alloc;
849
850 if (nalloc)
851 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
852
853 error = gfs2_trans_begin(sdp, blocks, 0);
854 if (error)
855 goto out_ipres;
856
857 for (x = 0; x < num_qd; x++) {
858 qd = qda[x];
859 offset = qd2offset(qd);
860 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
861 if (error)
862 goto out_end_trans;
863
864 do_qc(qd, -qd->qd_change_sync);
865 set_bit(QDF_REFRESH, &qd->qd_flags);
866 }
867
868 error = 0;
869
870 out_end_trans:
871 gfs2_trans_end(sdp);
872 out_ipres:
873 gfs2_inplace_release(ip);
874 out_alloc:
875 gfs2_glock_dq_uninit(&i_gh);
876 out:
877 while (qx--)
878 gfs2_glock_dq_uninit(&ghs[qx]);
879 mutex_unlock(&ip->i_inode.i_mutex);
880 kfree(ghs);
881 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
882 return error;
883 }
884
885 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
886 {
887 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
888 struct gfs2_quota q;
889 struct gfs2_quota_lvb *qlvb;
890 loff_t pos;
891 int error;
892
893 memset(&q, 0, sizeof(struct gfs2_quota));
894 pos = qd2offset(qd);
895 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
896 if (error < 0)
897 return error;
898
899 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
900 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
901 qlvb->__pad = 0;
902 qlvb->qb_limit = q.qu_limit;
903 qlvb->qb_warn = q.qu_warn;
904 qlvb->qb_value = q.qu_value;
905 qd->qd_qb = *qlvb;
906
907 return 0;
908 }
909
910 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
911 struct gfs2_holder *q_gh)
912 {
913 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
914 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
915 struct gfs2_holder i_gh;
916 int error;
917
918 restart:
919 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
920 if (error)
921 return error;
922
923 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
924
925 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
926 gfs2_glock_dq_uninit(q_gh);
927 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
928 GL_NOCACHE, q_gh);
929 if (error)
930 return error;
931
932 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
933 if (error)
934 goto fail;
935
936 error = update_qd(sdp, qd);
937 if (error)
938 goto fail_gunlock;
939
940 gfs2_glock_dq_uninit(&i_gh);
941 gfs2_glock_dq_uninit(q_gh);
942 force_refresh = 0;
943 goto restart;
944 }
945
946 return 0;
947
948 fail_gunlock:
949 gfs2_glock_dq_uninit(&i_gh);
950 fail:
951 gfs2_glock_dq_uninit(q_gh);
952 return error;
953 }
954
955 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
956 {
957 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
958 struct gfs2_quota_data *qd;
959 unsigned int x;
960 int error = 0;
961
962 error = gfs2_quota_hold(ip, uid, gid);
963 if (error)
964 return error;
965
966 if (capable(CAP_SYS_RESOURCE) ||
967 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
968 return 0;
969
970 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
971 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
972
973 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
974 int force = NO_FORCE;
975 qd = ip->i_res->rs_qa_qd[x];
976 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
977 force = FORCE;
978 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
979 if (error)
980 break;
981 }
982
983 if (!error)
984 set_bit(GIF_QD_LOCKED, &ip->i_flags);
985 else {
986 while (x--)
987 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
988 gfs2_quota_unhold(ip);
989 }
990
991 return error;
992 }
993
994 static int need_sync(struct gfs2_quota_data *qd)
995 {
996 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
997 struct gfs2_tune *gt = &sdp->sd_tune;
998 s64 value;
999 unsigned int num, den;
1000 int do_sync = 1;
1001
1002 if (!qd->qd_qb.qb_limit)
1003 return 0;
1004
1005 spin_lock(&qd_lock);
1006 value = qd->qd_change;
1007 spin_unlock(&qd_lock);
1008
1009 spin_lock(&gt->gt_spin);
1010 num = gt->gt_quota_scale_num;
1011 den = gt->gt_quota_scale_den;
1012 spin_unlock(&gt->gt_spin);
1013
1014 if (value < 0)
1015 do_sync = 0;
1016 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1017 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1018 do_sync = 0;
1019 else {
1020 value *= gfs2_jindex_size(sdp) * num;
1021 value = div_s64(value, den);
1022 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1023 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1024 do_sync = 0;
1025 }
1026
1027 return do_sync;
1028 }
1029
1030 void gfs2_quota_unlock(struct gfs2_inode *ip)
1031 {
1032 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1033 struct gfs2_quota_data *qda[4];
1034 unsigned int count = 0;
1035 unsigned int x;
1036 int found;
1037
1038 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1039 goto out;
1040
1041 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1042 struct gfs2_quota_data *qd;
1043 int sync;
1044
1045 qd = ip->i_res->rs_qa_qd[x];
1046 sync = need_sync(qd);
1047
1048 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1049 if (!sync)
1050 continue;
1051
1052 spin_lock(&qd_lock);
1053 found = qd_check_sync(sdp, qd, NULL);
1054 spin_unlock(&qd_lock);
1055
1056 if (!found)
1057 continue;
1058
1059 gfs2_assert_warn(sdp, qd->qd_change_sync);
1060 if (bh_get(qd)) {
1061 clear_bit(QDF_LOCKED, &qd->qd_flags);
1062 slot_put(qd);
1063 qd_put(qd);
1064 continue;
1065 }
1066
1067 qda[count++] = qd;
1068 }
1069
1070 if (count) {
1071 do_sync(count, qda);
1072 for (x = 0; x < count; x++)
1073 qd_unlock(qda[x]);
1074 }
1075
1076 out:
1077 gfs2_quota_unhold(ip);
1078 }
1079
1080 #define MAX_LINE 256
1081
1082 static int print_message(struct gfs2_quota_data *qd, char *type)
1083 {
1084 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1085
1086 pr_info("fsid=%s: quota %s for %s %u\n",
1087 sdp->sd_fsname, type,
1088 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1089 from_kqid(&init_user_ns, qd->qd_id));
1090
1091 return 0;
1092 }
1093
1094 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1095 {
1096 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1097 struct gfs2_quota_data *qd;
1098 s64 value;
1099 unsigned int x;
1100 int error = 0;
1101
1102 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1103 return 0;
1104
1105 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1106 return 0;
1107
1108 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1109 qd = ip->i_res->rs_qa_qd[x];
1110
1111 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1112 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1113 continue;
1114
1115 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1116 spin_lock(&qd_lock);
1117 value += qd->qd_change;
1118 spin_unlock(&qd_lock);
1119
1120 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1121 print_message(qd, "exceeded");
1122 quota_send_warning(qd->qd_id,
1123 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1124
1125 error = -EDQUOT;
1126 break;
1127 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1128 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1129 time_after_eq(jiffies, qd->qd_last_warn +
1130 gfs2_tune_get(sdp,
1131 gt_quota_warn_period) * HZ)) {
1132 quota_send_warning(qd->qd_id,
1133 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1134 error = print_message(qd, "warning");
1135 qd->qd_last_warn = jiffies;
1136 }
1137 }
1138
1139 return error;
1140 }
1141
1142 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1143 kuid_t uid, kgid_t gid)
1144 {
1145 struct gfs2_quota_data *qd;
1146 unsigned int x;
1147
1148 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1149 return;
1150 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1151 return;
1152
1153 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1154 qd = ip->i_res->rs_qa_qd[x];
1155
1156 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1157 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1158 do_qc(qd, change);
1159 }
1160 }
1161 }
1162
1163 int gfs2_quota_sync(struct super_block *sb, int type)
1164 {
1165 struct gfs2_sbd *sdp = sb->s_fs_info;
1166 struct gfs2_quota_data **qda;
1167 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1168 unsigned int num_qd;
1169 unsigned int x;
1170 int error = 0;
1171
1172 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1173 if (!qda)
1174 return -ENOMEM;
1175
1176 mutex_lock(&sdp->sd_quota_sync_mutex);
1177 sdp->sd_quota_sync_gen++;
1178
1179 do {
1180 num_qd = 0;
1181
1182 for (;;) {
1183 error = qd_fish(sdp, qda + num_qd);
1184 if (error || !qda[num_qd])
1185 break;
1186 if (++num_qd == max_qd)
1187 break;
1188 }
1189
1190 if (num_qd) {
1191 if (!error)
1192 error = do_sync(num_qd, qda);
1193 if (!error)
1194 for (x = 0; x < num_qd; x++)
1195 qda[x]->qd_sync_gen =
1196 sdp->sd_quota_sync_gen;
1197
1198 for (x = 0; x < num_qd; x++)
1199 qd_unlock(qda[x]);
1200 }
1201 } while (!error && num_qd == max_qd);
1202
1203 mutex_unlock(&sdp->sd_quota_sync_mutex);
1204 kfree(qda);
1205
1206 return error;
1207 }
1208
1209 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1210 {
1211 struct gfs2_quota_data *qd;
1212 struct gfs2_holder q_gh;
1213 int error;
1214
1215 error = qd_get(sdp, qid, &qd);
1216 if (error)
1217 return error;
1218
1219 error = do_glock(qd, FORCE, &q_gh);
1220 if (!error)
1221 gfs2_glock_dq_uninit(&q_gh);
1222
1223 qd_put(qd);
1224 return error;
1225 }
1226
1227 int gfs2_quota_init(struct gfs2_sbd *sdp)
1228 {
1229 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1230 u64 size = i_size_read(sdp->sd_qc_inode);
1231 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1232 unsigned int x, slot = 0;
1233 unsigned int found = 0;
1234 unsigned int hash;
1235 unsigned int bm_size;
1236 u64 dblock;
1237 u32 extlen = 0;
1238 int error;
1239
1240 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1241 return -EIO;
1242
1243 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1244 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1245 bm_size *= sizeof(unsigned long);
1246 error = -ENOMEM;
1247 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1248 if (sdp->sd_quota_bitmap == NULL)
1249 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1250 __GFP_ZERO, PAGE_KERNEL);
1251 if (!sdp->sd_quota_bitmap)
1252 return error;
1253
1254 for (x = 0; x < blocks; x++) {
1255 struct buffer_head *bh;
1256 const struct gfs2_quota_change *qc;
1257 unsigned int y;
1258
1259 if (!extlen) {
1260 int new = 0;
1261 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1262 if (error)
1263 goto fail;
1264 }
1265 error = -EIO;
1266 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1267 if (!bh)
1268 goto fail;
1269 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1270 brelse(bh);
1271 goto fail;
1272 }
1273
1274 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1275 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1276 y++, slot++) {
1277 struct gfs2_quota_data *qd;
1278 s64 qc_change = be64_to_cpu(qc->qc_change);
1279 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1280 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1281 USRQUOTA : GRPQUOTA;
1282 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1283 be32_to_cpu(qc->qc_id));
1284 qc++;
1285 if (!qc_change)
1286 continue;
1287
1288 hash = gfs2_qd_hash(sdp, qc_id);
1289 qd = qd_alloc(hash, sdp, qc_id);
1290 if (qd == NULL) {
1291 brelse(bh);
1292 goto fail;
1293 }
1294
1295 set_bit(QDF_CHANGE, &qd->qd_flags);
1296 qd->qd_change = qc_change;
1297 qd->qd_slot = slot;
1298 qd->qd_slot_count = 1;
1299
1300 spin_lock(&qd_lock);
1301 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1302 list_add(&qd->qd_list, &sdp->sd_quota_list);
1303 atomic_inc(&sdp->sd_quota_count);
1304 spin_unlock(&qd_lock);
1305
1306 spin_lock_bucket(hash);
1307 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1308 spin_unlock_bucket(hash);
1309
1310 found++;
1311 }
1312
1313 brelse(bh);
1314 dblock++;
1315 extlen--;
1316 }
1317
1318 if (found)
1319 fs_info(sdp, "found %u quota changes\n", found);
1320
1321 return 0;
1322
1323 fail:
1324 gfs2_quota_cleanup(sdp);
1325 return error;
1326 }
1327
1328 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1329 {
1330 struct list_head *head = &sdp->sd_quota_list;
1331 struct gfs2_quota_data *qd;
1332
1333 spin_lock(&qd_lock);
1334 while (!list_empty(head)) {
1335 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1336
1337 list_del(&qd->qd_list);
1338
1339 /* Also remove if this qd exists in the reclaim list */
1340 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1341 atomic_dec(&sdp->sd_quota_count);
1342 spin_unlock(&qd_lock);
1343
1344 spin_lock_bucket(qd->qd_hash);
1345 hlist_bl_del_rcu(&qd->qd_hlist);
1346 spin_unlock_bucket(qd->qd_hash);
1347
1348 gfs2_assert_warn(sdp, !qd->qd_change);
1349 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1350 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1351
1352 gfs2_glock_put(qd->qd_gl);
1353 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1354
1355 spin_lock(&qd_lock);
1356 }
1357 spin_unlock(&qd_lock);
1358
1359 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1360
1361 if (sdp->sd_quota_bitmap) {
1362 if (is_vmalloc_addr(sdp->sd_quota_bitmap))
1363 vfree(sdp->sd_quota_bitmap);
1364 else
1365 kfree(sdp->sd_quota_bitmap);
1366 sdp->sd_quota_bitmap = NULL;
1367 }
1368 }
1369
1370 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1371 {
1372 if (error == 0 || error == -EROFS)
1373 return;
1374 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1375 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1376 }
1377
1378 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1379 int (*fxn)(struct super_block *sb, int type),
1380 unsigned long t, unsigned long *timeo,
1381 unsigned int *new_timeo)
1382 {
1383 if (t >= *timeo) {
1384 int error = fxn(sdp->sd_vfs, 0);
1385 quotad_error(sdp, msg, error);
1386 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1387 } else {
1388 *timeo -= t;
1389 }
1390 }
1391
1392 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1393 {
1394 struct gfs2_inode *ip;
1395
1396 while(1) {
1397 ip = NULL;
1398 spin_lock(&sdp->sd_trunc_lock);
1399 if (!list_empty(&sdp->sd_trunc_list)) {
1400 ip = list_entry(sdp->sd_trunc_list.next,
1401 struct gfs2_inode, i_trunc_list);
1402 list_del_init(&ip->i_trunc_list);
1403 }
1404 spin_unlock(&sdp->sd_trunc_lock);
1405 if (ip == NULL)
1406 return;
1407 gfs2_glock_finish_truncate(ip);
1408 }
1409 }
1410
1411 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1412 if (!sdp->sd_statfs_force_sync) {
1413 sdp->sd_statfs_force_sync = 1;
1414 wake_up(&sdp->sd_quota_wait);
1415 }
1416 }
1417
1418
1419 /**
1420 * gfs2_quotad - Write cached quota changes into the quota file
1421 * @sdp: Pointer to GFS2 superblock
1422 *
1423 */
1424
1425 int gfs2_quotad(void *data)
1426 {
1427 struct gfs2_sbd *sdp = data;
1428 struct gfs2_tune *tune = &sdp->sd_tune;
1429 unsigned long statfs_timeo = 0;
1430 unsigned long quotad_timeo = 0;
1431 unsigned long t = 0;
1432 DEFINE_WAIT(wait);
1433 int empty;
1434
1435 while (!kthread_should_stop()) {
1436
1437 /* Update the master statfs file */
1438 if (sdp->sd_statfs_force_sync) {
1439 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1440 quotad_error(sdp, "statfs", error);
1441 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1442 }
1443 else
1444 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1445 &statfs_timeo,
1446 &tune->gt_statfs_quantum);
1447
1448 /* Update quota file */
1449 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1450 &quotad_timeo, &tune->gt_quota_quantum);
1451
1452 /* Check for & recover partially truncated inodes */
1453 quotad_check_trunc_list(sdp);
1454
1455 try_to_freeze();
1456
1457 t = min(quotad_timeo, statfs_timeo);
1458
1459 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1460 spin_lock(&sdp->sd_trunc_lock);
1461 empty = list_empty(&sdp->sd_trunc_list);
1462 spin_unlock(&sdp->sd_trunc_lock);
1463 if (empty && !sdp->sd_statfs_force_sync)
1464 t -= schedule_timeout(t);
1465 else
1466 t = 0;
1467 finish_wait(&sdp->sd_quota_wait, &wait);
1468 }
1469
1470 return 0;
1471 }
1472
1473 static int gfs2_quota_get_xstate(struct super_block *sb,
1474 struct fs_quota_stat *fqs)
1475 {
1476 struct gfs2_sbd *sdp = sb->s_fs_info;
1477
1478 memset(fqs, 0, sizeof(struct fs_quota_stat));
1479 fqs->qs_version = FS_QSTAT_VERSION;
1480
1481 switch (sdp->sd_args.ar_quota) {
1482 case GFS2_QUOTA_ON:
1483 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1484 /*FALLTHRU*/
1485 case GFS2_QUOTA_ACCOUNT:
1486 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1487 break;
1488 case GFS2_QUOTA_OFF:
1489 break;
1490 }
1491
1492 if (sdp->sd_quota_inode) {
1493 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1494 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1495 }
1496 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1497 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1498 fqs->qs_incoredqs = list_lru_count(&gfs2_qd_lru);
1499 return 0;
1500 }
1501
1502 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1503 struct fs_disk_quota *fdq)
1504 {
1505 struct gfs2_sbd *sdp = sb->s_fs_info;
1506 struct gfs2_quota_lvb *qlvb;
1507 struct gfs2_quota_data *qd;
1508 struct gfs2_holder q_gh;
1509 int error;
1510
1511 memset(fdq, 0, sizeof(struct fs_disk_quota));
1512
1513 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1514 return -ESRCH; /* Crazy XFS error code */
1515
1516 if ((qid.type != USRQUOTA) &&
1517 (qid.type != GRPQUOTA))
1518 return -EINVAL;
1519
1520 error = qd_get(sdp, qid, &qd);
1521 if (error)
1522 return error;
1523 error = do_glock(qd, FORCE, &q_gh);
1524 if (error)
1525 goto out;
1526
1527 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1528 fdq->d_version = FS_DQUOT_VERSION;
1529 fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1530 fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1531 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1532 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1533 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1534
1535 gfs2_glock_dq_uninit(&q_gh);
1536 out:
1537 qd_put(qd);
1538 return error;
1539 }
1540
1541 /* GFS2 only supports a subset of the XFS fields */
1542 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1543
1544 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1545 struct fs_disk_quota *fdq)
1546 {
1547 struct gfs2_sbd *sdp = sb->s_fs_info;
1548 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1549 struct gfs2_quota_data *qd;
1550 struct gfs2_holder q_gh, i_gh;
1551 unsigned int data_blocks, ind_blocks;
1552 unsigned int blocks = 0;
1553 int alloc_required;
1554 loff_t offset;
1555 int error;
1556
1557 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1558 return -ESRCH; /* Crazy XFS error code */
1559
1560 if ((qid.type != USRQUOTA) &&
1561 (qid.type != GRPQUOTA))
1562 return -EINVAL;
1563
1564 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1565 return -EINVAL;
1566
1567 error = qd_get(sdp, qid, &qd);
1568 if (error)
1569 return error;
1570
1571 error = gfs2_rs_alloc(ip);
1572 if (error)
1573 goto out_put;
1574
1575 mutex_lock(&ip->i_inode.i_mutex);
1576 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1577 if (error)
1578 goto out_unlockput;
1579 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1580 if (error)
1581 goto out_q;
1582
1583 /* Check for existing entry, if none then alloc new blocks */
1584 error = update_qd(sdp, qd);
1585 if (error)
1586 goto out_i;
1587
1588 /* If nothing has changed, this is a no-op */
1589 if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1590 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1591 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1592
1593 if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1594 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1595 fdq->d_fieldmask ^= FS_DQ_BHARD;
1596
1597 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1598 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1599 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1600
1601 if (fdq->d_fieldmask == 0)
1602 goto out_i;
1603
1604 offset = qd2offset(qd);
1605 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1606 if (gfs2_is_stuffed(ip))
1607 alloc_required = 1;
1608 if (alloc_required) {
1609 struct gfs2_alloc_parms ap = { .aflags = 0, };
1610 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1611 &data_blocks, &ind_blocks);
1612 blocks = 1 + data_blocks + ind_blocks;
1613 ap.target = blocks;
1614 error = gfs2_inplace_reserve(ip, &ap);
1615 if (error)
1616 goto out_i;
1617 blocks += gfs2_rg_blocks(ip, blocks);
1618 }
1619
1620 /* Some quotas span block boundaries and can update two blocks,
1621 adding an extra block to the transaction to handle such quotas */
1622 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1623 if (error)
1624 goto out_release;
1625
1626 /* Apply changes */
1627 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1628
1629 gfs2_trans_end(sdp);
1630 out_release:
1631 if (alloc_required)
1632 gfs2_inplace_release(ip);
1633 out_i:
1634 gfs2_glock_dq_uninit(&i_gh);
1635 out_q:
1636 gfs2_glock_dq_uninit(&q_gh);
1637 out_unlockput:
1638 mutex_unlock(&ip->i_inode.i_mutex);
1639 out_put:
1640 qd_put(qd);
1641 return error;
1642 }
1643
1644 const struct quotactl_ops gfs2_quotactl_ops = {
1645 .quota_sync = gfs2_quota_sync,
1646 .get_xstate = gfs2_quota_get_xstate,
1647 .get_dqblk = gfs2_get_dqblk,
1648 .set_dqblk = gfs2_set_dqblk,
1649 };
1650
1651 void __init gfs2_quota_hash_init(void)
1652 {
1653 unsigned i;
1654
1655 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1656 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1657 }
Linux kernel - Deliverables
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