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