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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 BIT(GFS2_QD_HASH_SHIFT)
79#define GFS2_QD_HASH_MASK (GFS2_QD_HASH_SIZE - 1)
80
81
82
83static DEFINE_SPINLOCK(qd_lock);
84struct list_lru gfs2_qd_lru;
85
86static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
87
88static 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
99static inline void spin_lock_bucket(unsigned int hash)
100{
101 hlist_bl_lock(&qd_hash_table[hash]);
102}
103
104static inline void spin_unlock_bucket(unsigned int hash)
105{
106 hlist_bl_unlock(&qd_hash_table[hash]);
107}
108
109static 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
115static 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_name.ln_sbd;
123
124 list_del(&qd->qd_lru);
125
126
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
143 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
144 }
145}
146
147
148static enum lru_status gfs2_qd_isolate(struct list_head *item,
149 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
150{
151 struct list_head *dispose = arg;
152 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
153
154 if (!spin_trylock(&qd->qd_lockref.lock))
155 return LRU_SKIP;
156
157 if (qd->qd_lockref.count == 0) {
158 lockref_mark_dead(&qd->qd_lockref);
159 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
160 }
161
162 spin_unlock(&qd->qd_lockref.lock);
163 return LRU_REMOVED;
164}
165
166static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
167 struct shrink_control *sc)
168{
169 LIST_HEAD(dispose);
170 unsigned long freed;
171
172 if (!(sc->gfp_mask & __GFP_FS))
173 return SHRINK_STOP;
174
175 freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
176 gfs2_qd_isolate, &dispose);
177
178 gfs2_qd_dispose(&dispose);
179
180 return freed;
181}
182
183static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
184 struct shrink_control *sc)
185{
186 return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
187}
188
189struct shrinker gfs2_qd_shrinker = {
190 .count_objects = gfs2_qd_shrink_count,
191 .scan_objects = gfs2_qd_shrink_scan,
192 .seeks = DEFAULT_SEEKS,
193 .flags = SHRINKER_NUMA_AWARE,
194};
195
196
197static u64 qd2index(struct gfs2_quota_data *qd)
198{
199 struct kqid qid = qd->qd_id;
200 return (2 * (u64)from_kqid(&init_user_ns, qid)) +
201 ((qid.type == USRQUOTA) ? 0 : 1);
202}
203
204static u64 qd2offset(struct gfs2_quota_data *qd)
205{
206 u64 offset;
207
208 offset = qd2index(qd);
209 offset *= sizeof(struct gfs2_quota);
210
211 return offset;
212}
213
214static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
215{
216 struct gfs2_quota_data *qd;
217 int error;
218
219 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
220 if (!qd)
221 return NULL;
222
223 qd->qd_sbd = sdp;
224 qd->qd_lockref.count = 1;
225 spin_lock_init(&qd->qd_lockref.lock);
226 qd->qd_id = qid;
227 qd->qd_slot = -1;
228 INIT_LIST_HEAD(&qd->qd_lru);
229 qd->qd_hash = hash;
230
231 error = gfs2_glock_get(sdp, qd2index(qd),
232 &gfs2_quota_glops, CREATE, &qd->qd_gl);
233 if (error)
234 goto fail;
235
236 return qd;
237
238fail:
239 kmem_cache_free(gfs2_quotad_cachep, qd);
240 return NULL;
241}
242
243static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
244 const struct gfs2_sbd *sdp,
245 struct kqid qid)
246{
247 struct gfs2_quota_data *qd;
248 struct hlist_bl_node *h;
249
250 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
251 if (!qid_eq(qd->qd_id, qid))
252 continue;
253 if (qd->qd_sbd != sdp)
254 continue;
255 if (lockref_get_not_dead(&qd->qd_lockref)) {
256 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
257 return qd;
258 }
259 }
260
261 return NULL;
262}
263
264
265static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
266 struct gfs2_quota_data **qdp)
267{
268 struct gfs2_quota_data *qd, *new_qd;
269 unsigned int hash = gfs2_qd_hash(sdp, qid);
270
271 rcu_read_lock();
272 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
273 rcu_read_unlock();
274
275 if (qd)
276 return 0;
277
278 new_qd = qd_alloc(hash, sdp, qid);
279 if (!new_qd)
280 return -ENOMEM;
281
282 spin_lock(&qd_lock);
283 spin_lock_bucket(hash);
284 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
285 if (qd == NULL) {
286 *qdp = new_qd;
287 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
288 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
289 atomic_inc(&sdp->sd_quota_count);
290 }
291 spin_unlock_bucket(hash);
292 spin_unlock(&qd_lock);
293
294 if (qd) {
295 gfs2_glock_put(new_qd->qd_gl);
296 kmem_cache_free(gfs2_quotad_cachep, new_qd);
297 }
298
299 return 0;
300}
301
302
303static void qd_hold(struct gfs2_quota_data *qd)
304{
305 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
306 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
307 lockref_get(&qd->qd_lockref);
308}
309
310static void qd_put(struct gfs2_quota_data *qd)
311{
312 if (lockref_put_or_lock(&qd->qd_lockref))
313 return;
314
315 qd->qd_lockref.count = 0;
316 list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
317 spin_unlock(&qd->qd_lockref.lock);
318
319}
320
321static int slot_get(struct gfs2_quota_data *qd)
322{
323 struct gfs2_sbd *sdp = qd->qd_sbd;
324 unsigned int bit;
325 int error = 0;
326
327 spin_lock(&sdp->sd_bitmap_lock);
328 if (qd->qd_slot_count != 0)
329 goto out;
330
331 error = -ENOSPC;
332 bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
333 if (bit < sdp->sd_quota_slots) {
334 set_bit(bit, sdp->sd_quota_bitmap);
335 qd->qd_slot = bit;
336 error = 0;
337out:
338 qd->qd_slot_count++;
339 }
340 spin_unlock(&sdp->sd_bitmap_lock);
341
342 return error;
343}
344
345static void slot_hold(struct gfs2_quota_data *qd)
346{
347 struct gfs2_sbd *sdp = qd->qd_sbd;
348
349 spin_lock(&sdp->sd_bitmap_lock);
350 gfs2_assert(sdp, qd->qd_slot_count);
351 qd->qd_slot_count++;
352 spin_unlock(&sdp->sd_bitmap_lock);
353}
354
355static void slot_put(struct gfs2_quota_data *qd)
356{
357 struct gfs2_sbd *sdp = qd->qd_sbd;
358
359 spin_lock(&sdp->sd_bitmap_lock);
360 gfs2_assert(sdp, qd->qd_slot_count);
361 if (!--qd->qd_slot_count) {
362 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
363 qd->qd_slot = -1;
364 }
365 spin_unlock(&sdp->sd_bitmap_lock);
366}
367
368static int bh_get(struct gfs2_quota_data *qd)
369{
370 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
371 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
372 unsigned int block, offset;
373 struct buffer_head *bh;
374 int error;
375 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
376
377 mutex_lock(&sdp->sd_quota_mutex);
378
379 if (qd->qd_bh_count++) {
380 mutex_unlock(&sdp->sd_quota_mutex);
381 return 0;
382 }
383
384 block = qd->qd_slot / sdp->sd_qc_per_block;
385 offset = qd->qd_slot % sdp->sd_qc_per_block;
386
387 bh_map.b_size = BIT(ip->i_inode.i_blkbits);
388 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
389 if (error)
390 goto fail;
391 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, 0, &bh);
392 if (error)
393 goto fail;
394 error = -EIO;
395 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
396 goto fail_brelse;
397
398 qd->qd_bh = bh;
399 qd->qd_bh_qc = (struct gfs2_quota_change *)
400 (bh->b_data + sizeof(struct gfs2_meta_header) +
401 offset * sizeof(struct gfs2_quota_change));
402
403 mutex_unlock(&sdp->sd_quota_mutex);
404
405 return 0;
406
407fail_brelse:
408 brelse(bh);
409fail:
410 qd->qd_bh_count--;
411 mutex_unlock(&sdp->sd_quota_mutex);
412 return error;
413}
414
415static void bh_put(struct gfs2_quota_data *qd)
416{
417 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
418
419 mutex_lock(&sdp->sd_quota_mutex);
420 gfs2_assert(sdp, qd->qd_bh_count);
421 if (!--qd->qd_bh_count) {
422 brelse(qd->qd_bh);
423 qd->qd_bh = NULL;
424 qd->qd_bh_qc = NULL;
425 }
426 mutex_unlock(&sdp->sd_quota_mutex);
427}
428
429static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
430 u64 *sync_gen)
431{
432 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
433 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
434 (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
435 return 0;
436
437 if (!lockref_get_not_dead(&qd->qd_lockref))
438 return 0;
439
440 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
441 set_bit(QDF_LOCKED, &qd->qd_flags);
442 qd->qd_change_sync = qd->qd_change;
443 slot_hold(qd);
444 return 1;
445}
446
447static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
448{
449 struct gfs2_quota_data *qd = NULL;
450 int error;
451 int found = 0;
452
453 *qdp = NULL;
454
455 if (sb_rdonly(sdp->sd_vfs))
456 return 0;
457
458 spin_lock(&qd_lock);
459
460 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
461 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
462 if (found)
463 break;
464 }
465
466 if (!found)
467 qd = NULL;
468
469 spin_unlock(&qd_lock);
470
471 if (qd) {
472 gfs2_assert_warn(sdp, qd->qd_change_sync);
473 error = bh_get(qd);
474 if (error) {
475 clear_bit(QDF_LOCKED, &qd->qd_flags);
476 slot_put(qd);
477 qd_put(qd);
478 return error;
479 }
480 }
481
482 *qdp = qd;
483
484 return 0;
485}
486
487static void qd_unlock(struct gfs2_quota_data *qd)
488{
489 gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd,
490 test_bit(QDF_LOCKED, &qd->qd_flags));
491 clear_bit(QDF_LOCKED, &qd->qd_flags);
492 bh_put(qd);
493 slot_put(qd);
494 qd_put(qd);
495}
496
497static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
498 struct gfs2_quota_data **qdp)
499{
500 int error;
501
502 error = qd_get(sdp, qid, qdp);
503 if (error)
504 return error;
505
506 error = slot_get(*qdp);
507 if (error)
508 goto fail;
509
510 error = bh_get(*qdp);
511 if (error)
512 goto fail_slot;
513
514 return 0;
515
516fail_slot:
517 slot_put(*qdp);
518fail:
519 qd_put(*qdp);
520 return error;
521}
522
523static void qdsb_put(struct gfs2_quota_data *qd)
524{
525 bh_put(qd);
526 slot_put(qd);
527 qd_put(qd);
528}
529
530
531
532
533
534
535int gfs2_qa_alloc(struct gfs2_inode *ip)
536{
537 int error = 0;
538 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
539
540 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
541 return 0;
542
543 down_write(&ip->i_rw_mutex);
544 if (ip->i_qadata == NULL) {
545 ip->i_qadata = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
546 if (!ip->i_qadata)
547 error = -ENOMEM;
548 }
549 up_write(&ip->i_rw_mutex);
550 return error;
551}
552
553void gfs2_qa_delete(struct gfs2_inode *ip, atomic_t *wcount)
554{
555 down_write(&ip->i_rw_mutex);
556 if (ip->i_qadata && ((wcount == NULL) || (atomic_read(wcount) <= 1))) {
557 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
558 ip->i_qadata = NULL;
559 }
560 up_write(&ip->i_rw_mutex);
561}
562
563int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
564{
565 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
566 struct gfs2_quota_data **qd;
567 int error;
568
569 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
570 return 0;
571
572 if (ip->i_qadata == NULL) {
573 error = gfs2_rsqa_alloc(ip);
574 if (error)
575 return error;
576 }
577
578 qd = ip->i_qadata->qa_qd;
579
580 if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
581 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
582 return -EIO;
583
584 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
585 if (error)
586 goto out;
587 ip->i_qadata->qa_qd_num++;
588 qd++;
589
590 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
591 if (error)
592 goto out;
593 ip->i_qadata->qa_qd_num++;
594 qd++;
595
596 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
597 !uid_eq(uid, ip->i_inode.i_uid)) {
598 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
599 if (error)
600 goto out;
601 ip->i_qadata->qa_qd_num++;
602 qd++;
603 }
604
605 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
606 !gid_eq(gid, ip->i_inode.i_gid)) {
607 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
608 if (error)
609 goto out;
610 ip->i_qadata->qa_qd_num++;
611 qd++;
612 }
613
614out:
615 if (error)
616 gfs2_quota_unhold(ip);
617 return error;
618}
619
620void gfs2_quota_unhold(struct gfs2_inode *ip)
621{
622 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
623 u32 x;
624
625 if (ip->i_qadata == NULL)
626 return;
627 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
628
629 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
630 qdsb_put(ip->i_qadata->qa_qd[x]);
631 ip->i_qadata->qa_qd[x] = NULL;
632 }
633 ip->i_qadata->qa_qd_num = 0;
634}
635
636static int sort_qd(const void *a, const void *b)
637{
638 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
639 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
640
641 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
642 return -1;
643 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
644 return 1;
645 return 0;
646}
647
648static void do_qc(struct gfs2_quota_data *qd, s64 change)
649{
650 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
651 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
652 struct gfs2_quota_change *qc = qd->qd_bh_qc;
653 s64 x;
654
655 mutex_lock(&sdp->sd_quota_mutex);
656 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
657
658 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
659 qc->qc_change = 0;
660 qc->qc_flags = 0;
661 if (qd->qd_id.type == USRQUOTA)
662 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
663 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
664 }
665
666 x = be64_to_cpu(qc->qc_change) + change;
667 qc->qc_change = cpu_to_be64(x);
668
669 spin_lock(&qd_lock);
670 qd->qd_change = x;
671 spin_unlock(&qd_lock);
672
673 if (!x) {
674 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
675 clear_bit(QDF_CHANGE, &qd->qd_flags);
676 qc->qc_flags = 0;
677 qc->qc_id = 0;
678 slot_put(qd);
679 qd_put(qd);
680 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
681 qd_hold(qd);
682 slot_hold(qd);
683 }
684
685 if (change < 0)
686 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
687 mutex_unlock(&sdp->sd_quota_mutex);
688}
689
690static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
691 unsigned off, void *buf, unsigned bytes)
692{
693 struct inode *inode = &ip->i_inode;
694 struct gfs2_sbd *sdp = GFS2_SB(inode);
695 struct address_space *mapping = inode->i_mapping;
696 struct page *page;
697 struct buffer_head *bh;
698 void *kaddr;
699 u64 blk;
700 unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
701 unsigned to_write = bytes, pg_off = off;
702 int done = 0;
703
704 blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
705 boff = off % bsize;
706
707 page = find_or_create_page(mapping, index, GFP_NOFS);
708 if (!page)
709 return -ENOMEM;
710 if (!page_has_buffers(page))
711 create_empty_buffers(page, bsize, 0);
712
713 bh = page_buffers(page);
714 while (!done) {
715
716 if (pg_off >= ((bnum * bsize) + bsize)) {
717 bh = bh->b_this_page;
718 bnum++;
719 blk++;
720 continue;
721 }
722 if (!buffer_mapped(bh)) {
723 gfs2_block_map(inode, blk, bh, 1);
724 if (!buffer_mapped(bh))
725 goto unlock_out;
726
727 if (buffer_new(bh))
728 zero_user(page, bnum * bsize, bh->b_size);
729 }
730 if (PageUptodate(page))
731 set_buffer_uptodate(bh);
732 if (!buffer_uptodate(bh)) {
733 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &bh);
734 wait_on_buffer(bh);
735 if (!buffer_uptodate(bh))
736 goto unlock_out;
737 }
738 if (gfs2_is_jdata(ip))
739 gfs2_trans_add_data(ip->i_gl, bh);
740 else
741 gfs2_ordered_add_inode(ip);
742
743
744 if (to_write > (bsize - boff)) {
745 pg_off += (bsize - boff);
746 to_write -= (bsize - boff);
747 boff = pg_off % bsize;
748 continue;
749 }
750 done = 1;
751 }
752
753
754 kaddr = kmap_atomic(page);
755 memcpy(kaddr + off, buf, bytes);
756 flush_dcache_page(page);
757 kunmap_atomic(kaddr);
758 unlock_page(page);
759 put_page(page);
760
761 return 0;
762
763unlock_out:
764 unlock_page(page);
765 put_page(page);
766 return -EIO;
767}
768
769static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
770 loff_t loc)
771{
772 unsigned long pg_beg;
773 unsigned pg_off, nbytes, overflow = 0;
774 int pg_oflow = 0, error;
775 void *ptr;
776
777 nbytes = sizeof(struct gfs2_quota);
778
779 pg_beg = loc >> PAGE_SHIFT;
780 pg_off = loc % PAGE_SIZE;
781
782
783 if ((pg_off + nbytes) > PAGE_SIZE) {
784 pg_oflow = 1;
785 overflow = (pg_off + nbytes) - PAGE_SIZE;
786 }
787
788 ptr = qp;
789 error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
790 nbytes - overflow);
791
792 if (!error && pg_oflow)
793 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
794 ptr + nbytes - overflow,
795 overflow);
796 return error;
797}
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
814 s64 change, struct gfs2_quota_data *qd,
815 struct qc_dqblk *fdq)
816{
817 struct inode *inode = &ip->i_inode;
818 struct gfs2_sbd *sdp = GFS2_SB(inode);
819 struct gfs2_quota q;
820 int err;
821 u64 size;
822
823 if (gfs2_is_stuffed(ip)) {
824 err = gfs2_unstuff_dinode(ip, NULL);
825 if (err)
826 return err;
827 }
828
829 memset(&q, 0, sizeof(struct gfs2_quota));
830 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
831 if (err < 0)
832 return err;
833
834 loc -= sizeof(q);
835 err = -EIO;
836 be64_add_cpu(&q.qu_value, change);
837 if (((s64)be64_to_cpu(q.qu_value)) < 0)
838 q.qu_value = 0;
839 qd->qd_qb.qb_value = q.qu_value;
840 if (fdq) {
841 if (fdq->d_fieldmask & QC_SPC_SOFT) {
842 q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
843 qd->qd_qb.qb_warn = q.qu_warn;
844 }
845 if (fdq->d_fieldmask & QC_SPC_HARD) {
846 q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
847 qd->qd_qb.qb_limit = q.qu_limit;
848 }
849 if (fdq->d_fieldmask & QC_SPACE) {
850 q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
851 qd->qd_qb.qb_value = q.qu_value;
852 }
853 }
854
855 err = gfs2_write_disk_quota(ip, &q, loc);
856 if (!err) {
857 size = loc + sizeof(struct gfs2_quota);
858 if (size > inode->i_size)
859 i_size_write(inode, size);
860 inode->i_mtime = inode->i_atime = current_time(inode);
861 mark_inode_dirty(inode);
862 set_bit(QDF_REFRESH, &qd->qd_flags);
863 }
864
865 return err;
866}
867
868static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
869{
870 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd;
871 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
872 struct gfs2_alloc_parms ap = { .aflags = 0, };
873 unsigned int data_blocks, ind_blocks;
874 struct gfs2_holder *ghs, i_gh;
875 unsigned int qx, x;
876 struct gfs2_quota_data *qd;
877 unsigned reserved;
878 loff_t offset;
879 unsigned int nalloc = 0, blocks;
880 int error;
881
882 error = gfs2_rsqa_alloc(ip);
883 if (error)
884 return error;
885
886 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
887 &data_blocks, &ind_blocks);
888
889 ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
890 if (!ghs)
891 return -ENOMEM;
892
893 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
894 inode_lock(&ip->i_inode);
895 for (qx = 0; qx < num_qd; qx++) {
896 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
897 GL_NOCACHE, &ghs[qx]);
898 if (error)
899 goto out;
900 }
901
902 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
903 if (error)
904 goto out;
905
906 for (x = 0; x < num_qd; x++) {
907 offset = qd2offset(qda[x]);
908 if (gfs2_write_alloc_required(ip, offset,
909 sizeof(struct gfs2_quota)))
910 nalloc++;
911 }
912
913
914
915
916
917
918
919
920
921
922 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
923
924 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
925 ap.target = reserved;
926 error = gfs2_inplace_reserve(ip, &ap);
927 if (error)
928 goto out_alloc;
929
930 if (nalloc)
931 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
932
933 error = gfs2_trans_begin(sdp, blocks, 0);
934 if (error)
935 goto out_ipres;
936
937 for (x = 0; x < num_qd; x++) {
938 qd = qda[x];
939 offset = qd2offset(qd);
940 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
941 if (error)
942 goto out_end_trans;
943
944 do_qc(qd, -qd->qd_change_sync);
945 set_bit(QDF_REFRESH, &qd->qd_flags);
946 }
947
948 error = 0;
949
950out_end_trans:
951 gfs2_trans_end(sdp);
952out_ipres:
953 gfs2_inplace_release(ip);
954out_alloc:
955 gfs2_glock_dq_uninit(&i_gh);
956out:
957 while (qx--)
958 gfs2_glock_dq_uninit(&ghs[qx]);
959 inode_unlock(&ip->i_inode);
960 kfree(ghs);
961 gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
962 GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
963 return error;
964}
965
966static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
967{
968 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
969 struct gfs2_quota q;
970 struct gfs2_quota_lvb *qlvb;
971 loff_t pos;
972 int error;
973
974 memset(&q, 0, sizeof(struct gfs2_quota));
975 pos = qd2offset(qd);
976 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
977 if (error < 0)
978 return error;
979
980 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
981 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
982 qlvb->__pad = 0;
983 qlvb->qb_limit = q.qu_limit;
984 qlvb->qb_warn = q.qu_warn;
985 qlvb->qb_value = q.qu_value;
986 qd->qd_qb = *qlvb;
987
988 return 0;
989}
990
991static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
992 struct gfs2_holder *q_gh)
993{
994 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
995 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
996 struct gfs2_holder i_gh;
997 int error;
998
999restart:
1000 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1001 if (error)
1002 return error;
1003
1004 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1005 force_refresh = FORCE;
1006
1007 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1008
1009 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1010 gfs2_glock_dq_uninit(q_gh);
1011 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1012 GL_NOCACHE, q_gh);
1013 if (error)
1014 return error;
1015
1016 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1017 if (error)
1018 goto fail;
1019
1020 error = update_qd(sdp, qd);
1021 if (error)
1022 goto fail_gunlock;
1023
1024 gfs2_glock_dq_uninit(&i_gh);
1025 gfs2_glock_dq_uninit(q_gh);
1026 force_refresh = 0;
1027 goto restart;
1028 }
1029
1030 return 0;
1031
1032fail_gunlock:
1033 gfs2_glock_dq_uninit(&i_gh);
1034fail:
1035 gfs2_glock_dq_uninit(q_gh);
1036 return error;
1037}
1038
1039int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1040{
1041 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1042 struct gfs2_quota_data *qd;
1043 u32 x;
1044 int error = 0;
1045
1046 if (capable(CAP_SYS_RESOURCE) ||
1047 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1048 return 0;
1049
1050 error = gfs2_quota_hold(ip, uid, gid);
1051 if (error)
1052 return error;
1053
1054 sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1055 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1056
1057 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1058 qd = ip->i_qadata->qa_qd[x];
1059 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1060 if (error)
1061 break;
1062 }
1063
1064 if (!error)
1065 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1066 else {
1067 while (x--)
1068 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1069 gfs2_quota_unhold(ip);
1070 }
1071
1072 return error;
1073}
1074
1075static int need_sync(struct gfs2_quota_data *qd)
1076{
1077 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1078 struct gfs2_tune *gt = &sdp->sd_tune;
1079 s64 value;
1080 unsigned int num, den;
1081 int do_sync = 1;
1082
1083 if (!qd->qd_qb.qb_limit)
1084 return 0;
1085
1086 spin_lock(&qd_lock);
1087 value = qd->qd_change;
1088 spin_unlock(&qd_lock);
1089
1090 spin_lock(>->gt_spin);
1091 num = gt->gt_quota_scale_num;
1092 den = gt->gt_quota_scale_den;
1093 spin_unlock(>->gt_spin);
1094
1095 if (value < 0)
1096 do_sync = 0;
1097 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1098 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1099 do_sync = 0;
1100 else {
1101 value *= gfs2_jindex_size(sdp) * num;
1102 value = div_s64(value, den);
1103 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1104 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1105 do_sync = 0;
1106 }
1107
1108 return do_sync;
1109}
1110
1111void gfs2_quota_unlock(struct gfs2_inode *ip)
1112{
1113 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1114 struct gfs2_quota_data *qda[4];
1115 unsigned int count = 0;
1116 u32 x;
1117 int found;
1118
1119 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1120 goto out;
1121
1122 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1123 struct gfs2_quota_data *qd;
1124 int sync;
1125
1126 qd = ip->i_qadata->qa_qd[x];
1127 sync = need_sync(qd);
1128
1129 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1130 if (!sync)
1131 continue;
1132
1133 spin_lock(&qd_lock);
1134 found = qd_check_sync(sdp, qd, NULL);
1135 spin_unlock(&qd_lock);
1136
1137 if (!found)
1138 continue;
1139
1140 gfs2_assert_warn(sdp, qd->qd_change_sync);
1141 if (bh_get(qd)) {
1142 clear_bit(QDF_LOCKED, &qd->qd_flags);
1143 slot_put(qd);
1144 qd_put(qd);
1145 continue;
1146 }
1147
1148 qda[count++] = qd;
1149 }
1150
1151 if (count) {
1152 do_sync(count, qda);
1153 for (x = 0; x < count; x++)
1154 qd_unlock(qda[x]);
1155 }
1156
1157out:
1158 gfs2_quota_unhold(ip);
1159}
1160
1161#define MAX_LINE 256
1162
1163static int print_message(struct gfs2_quota_data *qd, char *type)
1164{
1165 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1166
1167 fs_info(sdp, "quota %s for %s %u\n",
1168 type,
1169 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1170 from_kqid(&init_user_ns, qd->qd_id));
1171
1172 return 0;
1173}
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1193 struct gfs2_alloc_parms *ap)
1194{
1195 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1196 struct gfs2_quota_data *qd;
1197 s64 value, warn, limit;
1198 u32 x;
1199 int error = 0;
1200
1201 ap->allowed = UINT_MAX;
1202 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1203 return 0;
1204
1205 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1206 return 0;
1207
1208 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1209 qd = ip->i_qadata->qa_qd[x];
1210
1211 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1212 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1213 continue;
1214
1215 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1216 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1217 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1218 spin_lock(&qd_lock);
1219 value += qd->qd_change;
1220 spin_unlock(&qd_lock);
1221
1222 if (limit > 0 && (limit - value) < ap->allowed)
1223 ap->allowed = limit - value;
1224
1225 if (limit && limit < (value + (s64)ap->target)) {
1226
1227
1228 if (!ap->min_target || ap->min_target > ap->allowed) {
1229 if (!test_and_set_bit(QDF_QMSG_QUIET,
1230 &qd->qd_flags)) {
1231 print_message(qd, "exceeded");
1232 quota_send_warning(qd->qd_id,
1233 sdp->sd_vfs->s_dev,
1234 QUOTA_NL_BHARDWARN);
1235 }
1236 error = -EDQUOT;
1237 break;
1238 }
1239 } else if (warn && warn < value &&
1240 time_after_eq(jiffies, qd->qd_last_warn +
1241 gfs2_tune_get(sdp, gt_quota_warn_period)
1242 * HZ)) {
1243 quota_send_warning(qd->qd_id,
1244 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1245 error = print_message(qd, "warning");
1246 qd->qd_last_warn = jiffies;
1247 }
1248 }
1249 return error;
1250}
1251
1252void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1253 kuid_t uid, kgid_t gid)
1254{
1255 struct gfs2_quota_data *qd;
1256 u32 x;
1257 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1258
1259 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
1260 gfs2_assert_warn(sdp, change))
1261 return;
1262 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1263 return;
1264
1265 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1266 qd = ip->i_qadata->qa_qd[x];
1267
1268 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1269 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1270 do_qc(qd, change);
1271 }
1272 }
1273}
1274
1275int gfs2_quota_sync(struct super_block *sb, int type)
1276{
1277 struct gfs2_sbd *sdp = sb->s_fs_info;
1278 struct gfs2_quota_data **qda;
1279 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1280 unsigned int num_qd;
1281 unsigned int x;
1282 int error = 0;
1283
1284 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1285 if (!qda)
1286 return -ENOMEM;
1287
1288 mutex_lock(&sdp->sd_quota_sync_mutex);
1289 sdp->sd_quota_sync_gen++;
1290
1291 do {
1292 num_qd = 0;
1293
1294 for (;;) {
1295 error = qd_fish(sdp, qda + num_qd);
1296 if (error || !qda[num_qd])
1297 break;
1298 if (++num_qd == max_qd)
1299 break;
1300 }
1301
1302 if (num_qd) {
1303 if (!error)
1304 error = do_sync(num_qd, qda);
1305 if (!error)
1306 for (x = 0; x < num_qd; x++)
1307 qda[x]->qd_sync_gen =
1308 sdp->sd_quota_sync_gen;
1309
1310 for (x = 0; x < num_qd; x++)
1311 qd_unlock(qda[x]);
1312 }
1313 } while (!error && num_qd == max_qd);
1314
1315 mutex_unlock(&sdp->sd_quota_sync_mutex);
1316 kfree(qda);
1317
1318 return error;
1319}
1320
1321int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1322{
1323 struct gfs2_quota_data *qd;
1324 struct gfs2_holder q_gh;
1325 int error;
1326
1327 error = qd_get(sdp, qid, &qd);
1328 if (error)
1329 return error;
1330
1331 error = do_glock(qd, FORCE, &q_gh);
1332 if (!error)
1333 gfs2_glock_dq_uninit(&q_gh);
1334
1335 qd_put(qd);
1336 return error;
1337}
1338
1339int gfs2_quota_init(struct gfs2_sbd *sdp)
1340{
1341 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1342 u64 size = i_size_read(sdp->sd_qc_inode);
1343 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1344 unsigned int x, slot = 0;
1345 unsigned int found = 0;
1346 unsigned int hash;
1347 unsigned int bm_size;
1348 u64 dblock;
1349 u32 extlen = 0;
1350 int error;
1351
1352 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1353 return -EIO;
1354
1355 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1356 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1357 bm_size *= sizeof(unsigned long);
1358 error = -ENOMEM;
1359 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1360 if (sdp->sd_quota_bitmap == NULL)
1361 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1362 __GFP_ZERO, PAGE_KERNEL);
1363 if (!sdp->sd_quota_bitmap)
1364 return error;
1365
1366 for (x = 0; x < blocks; x++) {
1367 struct buffer_head *bh;
1368 const struct gfs2_quota_change *qc;
1369 unsigned int y;
1370
1371 if (!extlen) {
1372 int new = 0;
1373 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1374 if (error)
1375 goto fail;
1376 }
1377 error = -EIO;
1378 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1379 if (!bh)
1380 goto fail;
1381 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1382 brelse(bh);
1383 goto fail;
1384 }
1385
1386 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1387 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1388 y++, slot++) {
1389 struct gfs2_quota_data *qd;
1390 s64 qc_change = be64_to_cpu(qc->qc_change);
1391 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1392 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1393 USRQUOTA : GRPQUOTA;
1394 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1395 be32_to_cpu(qc->qc_id));
1396 qc++;
1397 if (!qc_change)
1398 continue;
1399
1400 hash = gfs2_qd_hash(sdp, qc_id);
1401 qd = qd_alloc(hash, sdp, qc_id);
1402 if (qd == NULL) {
1403 brelse(bh);
1404 goto fail;
1405 }
1406
1407 set_bit(QDF_CHANGE, &qd->qd_flags);
1408 qd->qd_change = qc_change;
1409 qd->qd_slot = slot;
1410 qd->qd_slot_count = 1;
1411
1412 spin_lock(&qd_lock);
1413 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1414 list_add(&qd->qd_list, &sdp->sd_quota_list);
1415 atomic_inc(&sdp->sd_quota_count);
1416 spin_unlock(&qd_lock);
1417
1418 spin_lock_bucket(hash);
1419 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1420 spin_unlock_bucket(hash);
1421
1422 found++;
1423 }
1424
1425 brelse(bh);
1426 dblock++;
1427 extlen--;
1428 }
1429
1430 if (found)
1431 fs_info(sdp, "found %u quota changes\n", found);
1432
1433 return 0;
1434
1435fail:
1436 gfs2_quota_cleanup(sdp);
1437 return error;
1438}
1439
1440void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1441{
1442 struct list_head *head = &sdp->sd_quota_list;
1443 struct gfs2_quota_data *qd;
1444
1445 spin_lock(&qd_lock);
1446 while (!list_empty(head)) {
1447 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1448
1449 list_del(&qd->qd_list);
1450
1451
1452 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1453 atomic_dec(&sdp->sd_quota_count);
1454 spin_unlock(&qd_lock);
1455
1456 spin_lock_bucket(qd->qd_hash);
1457 hlist_bl_del_rcu(&qd->qd_hlist);
1458 spin_unlock_bucket(qd->qd_hash);
1459
1460 gfs2_assert_warn(sdp, !qd->qd_change);
1461 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1462 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1463
1464 gfs2_glock_put(qd->qd_gl);
1465 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1466
1467 spin_lock(&qd_lock);
1468 }
1469 spin_unlock(&qd_lock);
1470
1471 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1472
1473 kvfree(sdp->sd_quota_bitmap);
1474 sdp->sd_quota_bitmap = NULL;
1475}
1476
1477static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1478{
1479 if (error == 0 || error == -EROFS)
1480 return;
1481 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
1482 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1483 sdp->sd_log_error = error;
1484 wake_up(&sdp->sd_logd_waitq);
1485 }
1486}
1487
1488static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1489 int (*fxn)(struct super_block *sb, int type),
1490 unsigned long t, unsigned long *timeo,
1491 unsigned int *new_timeo)
1492{
1493 if (t >= *timeo) {
1494 int error = fxn(sdp->sd_vfs, 0);
1495 quotad_error(sdp, msg, error);
1496 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1497 } else {
1498 *timeo -= t;
1499 }
1500}
1501
1502static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1503{
1504 struct gfs2_inode *ip;
1505
1506 while(1) {
1507 ip = NULL;
1508 spin_lock(&sdp->sd_trunc_lock);
1509 if (!list_empty(&sdp->sd_trunc_list)) {
1510 ip = list_entry(sdp->sd_trunc_list.next,
1511 struct gfs2_inode, i_trunc_list);
1512 list_del_init(&ip->i_trunc_list);
1513 }
1514 spin_unlock(&sdp->sd_trunc_lock);
1515 if (ip == NULL)
1516 return;
1517 gfs2_glock_finish_truncate(ip);
1518 }
1519}
1520
1521void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1522 if (!sdp->sd_statfs_force_sync) {
1523 sdp->sd_statfs_force_sync = 1;
1524 wake_up(&sdp->sd_quota_wait);
1525 }
1526}
1527
1528
1529
1530
1531
1532
1533
1534
1535int gfs2_quotad(void *data)
1536{
1537 struct gfs2_sbd *sdp = data;
1538 struct gfs2_tune *tune = &sdp->sd_tune;
1539 unsigned long statfs_timeo = 0;
1540 unsigned long quotad_timeo = 0;
1541 unsigned long t = 0;
1542 DEFINE_WAIT(wait);
1543 int empty;
1544
1545 while (!kthread_should_stop()) {
1546
1547
1548 if (sdp->sd_statfs_force_sync) {
1549 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1550 quotad_error(sdp, "statfs", error);
1551 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1552 }
1553 else
1554 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1555 &statfs_timeo,
1556 &tune->gt_statfs_quantum);
1557
1558
1559 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1560 "ad_timeo, &tune->gt_quota_quantum);
1561
1562
1563 quotad_check_trunc_list(sdp);
1564
1565 try_to_freeze();
1566
1567 t = min(quotad_timeo, statfs_timeo);
1568
1569 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1570 spin_lock(&sdp->sd_trunc_lock);
1571 empty = list_empty(&sdp->sd_trunc_list);
1572 spin_unlock(&sdp->sd_trunc_lock);
1573 if (empty && !sdp->sd_statfs_force_sync)
1574 t -= schedule_timeout(t);
1575 else
1576 t = 0;
1577 finish_wait(&sdp->sd_quota_wait, &wait);
1578 }
1579
1580 return 0;
1581}
1582
1583static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1584{
1585 struct gfs2_sbd *sdp = sb->s_fs_info;
1586
1587 memset(state, 0, sizeof(*state));
1588
1589 switch (sdp->sd_args.ar_quota) {
1590 case GFS2_QUOTA_ON:
1591 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1592 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1593
1594 case GFS2_QUOTA_ACCOUNT:
1595 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1596 QCI_SYSFILE;
1597 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1598 QCI_SYSFILE;
1599 break;
1600 case GFS2_QUOTA_OFF:
1601 break;
1602 }
1603 if (sdp->sd_quota_inode) {
1604 state->s_state[USRQUOTA].ino =
1605 GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1606 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1607 }
1608 state->s_state[USRQUOTA].nextents = 1;
1609 state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1610 state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1611 return 0;
1612}
1613
1614static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1615 struct qc_dqblk *fdq)
1616{
1617 struct gfs2_sbd *sdp = sb->s_fs_info;
1618 struct gfs2_quota_lvb *qlvb;
1619 struct gfs2_quota_data *qd;
1620 struct gfs2_holder q_gh;
1621 int error;
1622
1623 memset(fdq, 0, sizeof(*fdq));
1624
1625 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1626 return -ESRCH;
1627
1628 if ((qid.type != USRQUOTA) &&
1629 (qid.type != GRPQUOTA))
1630 return -EINVAL;
1631
1632 error = qd_get(sdp, qid, &qd);
1633 if (error)
1634 return error;
1635 error = do_glock(qd, FORCE, &q_gh);
1636 if (error)
1637 goto out;
1638
1639 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1640 fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1641 fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1642 fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1643
1644 gfs2_glock_dq_uninit(&q_gh);
1645out:
1646 qd_put(qd);
1647 return error;
1648}
1649
1650
1651#define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1652
1653static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1654 struct qc_dqblk *fdq)
1655{
1656 struct gfs2_sbd *sdp = sb->s_fs_info;
1657 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1658 struct gfs2_quota_data *qd;
1659 struct gfs2_holder q_gh, i_gh;
1660 unsigned int data_blocks, ind_blocks;
1661 unsigned int blocks = 0;
1662 int alloc_required;
1663 loff_t offset;
1664 int error;
1665
1666 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1667 return -ESRCH;
1668
1669 if ((qid.type != USRQUOTA) &&
1670 (qid.type != GRPQUOTA))
1671 return -EINVAL;
1672
1673 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1674 return -EINVAL;
1675
1676 error = qd_get(sdp, qid, &qd);
1677 if (error)
1678 return error;
1679
1680 error = gfs2_rsqa_alloc(ip);
1681 if (error)
1682 goto out_put;
1683
1684 inode_lock(&ip->i_inode);
1685 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1686 if (error)
1687 goto out_unlockput;
1688 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1689 if (error)
1690 goto out_q;
1691
1692
1693 error = update_qd(sdp, qd);
1694 if (error)
1695 goto out_i;
1696
1697
1698 if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1699 ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1700 fdq->d_fieldmask ^= QC_SPC_SOFT;
1701
1702 if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1703 ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1704 fdq->d_fieldmask ^= QC_SPC_HARD;
1705
1706 if ((fdq->d_fieldmask & QC_SPACE) &&
1707 ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1708 fdq->d_fieldmask ^= QC_SPACE;
1709
1710 if (fdq->d_fieldmask == 0)
1711 goto out_i;
1712
1713 offset = qd2offset(qd);
1714 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1715 if (gfs2_is_stuffed(ip))
1716 alloc_required = 1;
1717 if (alloc_required) {
1718 struct gfs2_alloc_parms ap = { .aflags = 0, };
1719 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1720 &data_blocks, &ind_blocks);
1721 blocks = 1 + data_blocks + ind_blocks;
1722 ap.target = blocks;
1723 error = gfs2_inplace_reserve(ip, &ap);
1724 if (error)
1725 goto out_i;
1726 blocks += gfs2_rg_blocks(ip, blocks);
1727 }
1728
1729
1730
1731 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1732 if (error)
1733 goto out_release;
1734
1735
1736 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1737 if (!error)
1738 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1739
1740 gfs2_trans_end(sdp);
1741out_release:
1742 if (alloc_required)
1743 gfs2_inplace_release(ip);
1744out_i:
1745 gfs2_glock_dq_uninit(&i_gh);
1746out_q:
1747 gfs2_glock_dq_uninit(&q_gh);
1748out_unlockput:
1749 inode_unlock(&ip->i_inode);
1750out_put:
1751 qd_put(qd);
1752 return error;
1753}
1754
1755const struct quotactl_ops gfs2_quotactl_ops = {
1756 .quota_sync = gfs2_quota_sync,
1757 .get_state = gfs2_quota_get_state,
1758 .get_dqblk = gfs2_get_dqblk,
1759 .set_dqblk = gfs2_set_dqblk,
1760};
1761
1762void __init gfs2_quota_hash_init(void)
1763{
1764 unsigned i;
1765
1766 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1767 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1768}
1769