1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
5 */
6
7 /*
8 * Quota change tags are associated with each transaction that allocates or
9 * deallocates space. Those changes are accumulated locally to each node (in a
10 * per-node file) and then are periodically synced to the quota file. This
11 * avoids the bottleneck of constantly touching the quota file, but introduces
12 * fuzziness in the current usage value of IDs that are being used on different
13 * nodes in the cluster simultaneously. So, it is possible for a user on
14 * multiple nodes to overrun their quota, but that overrun is controlable.
15 * Since quota tags are part of transactions, there is no need for a quota check
16 * program to be run on node crashes or anything like that.
17 *
18 * There are couple of knobs that let the administrator manage the quota
19 * fuzziness. "quota_quantum" sets the maximum time a quota change can be
20 * sitting on one node before being synced to the quota file. (The default is
21 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency
22 * of quota file syncs increases as the user moves closer to their limit. The
23 * more frequent the syncs, the more accurate the quota enforcement, but that
24 * means that there is more contention between the nodes for the quota file.
25 * The default value is one. This sets the maximum theoretical quota overrun
26 * (with infinite node with infinite bandwidth) to twice the user's limit. (In
27 * practice, the maximum overrun you see should be much less.) A "quota_scale"
28 * number greater than one makes quota syncs more frequent and reduces the
29 * maximum overrun. Numbers less than one (but greater than zero) make quota
30 * syncs less frequent.
31 *
32 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
33 * the quota file, so it is not being constantly read.
34 */
35
36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
37
38 #include <linux/sched.h>
39 #include <linux/slab.h>
40 #include <linux/mm.h>
41 #include <linux/spinlock.h>
42 #include <linux/completion.h>
43 #include <linux/buffer_head.h>
44 #include <linux/sort.h>
45 #include <linux/fs.h>
46 #include <linux/bio.h>
47 #include <linux/gfs2_ondisk.h>
48 #include <linux/kthread.h>
49 #include <linux/freezer.h>
50 #include <linux/quota.h>
51 #include <linux/dqblk_xfs.h>
52 #include <linux/lockref.h>
53 #include <linux/list_lru.h>
54 #include <linux/rcupdate.h>
55 #include <linux/rculist_bl.h>
56 #include <linux/bit_spinlock.h>
57 #include <linux/jhash.h>
58 #include <linux/vmalloc.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 BIT(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
gfs2_qd_hash(const struct gfs2_sbd * sdp,const struct kqid qid)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
spin_lock_bucket(unsigned int hash)96 static inline void spin_lock_bucket(unsigned int hash)
97 {
98 hlist_bl_lock(&qd_hash_table[hash]);
99 }
100
spin_unlock_bucket(unsigned int hash)101 static inline void spin_unlock_bucket(unsigned int hash)
102 {
103 hlist_bl_unlock(&qd_hash_table[hash]);
104 }
105
gfs2_qd_dealloc(struct rcu_head * rcu)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
gfs2_qd_dispose(struct list_head * list)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_first_entry(list, struct gfs2_quota_data, qd_lru);
119 sdp = qd->qd_gl->gl_name.ln_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
gfs2_qd_isolate(struct list_head * item,struct list_lru_one * lru,spinlock_t * lru_lock,void * arg)145 static enum lru_status gfs2_qd_isolate(struct list_head *item,
146 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
147 {
148 struct list_head *dispose = arg;
149 struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
150
151 if (!spin_trylock(&qd->qd_lockref.lock))
152 return LRU_SKIP;
153
154 if (qd->qd_lockref.count == 0) {
155 lockref_mark_dead(&qd->qd_lockref);
156 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
157 }
158
159 spin_unlock(&qd->qd_lockref.lock);
160 return LRU_REMOVED;
161 }
162
gfs2_qd_shrink_scan(struct shrinker * shrink,struct shrink_control * sc)163 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
164 struct shrink_control *sc)
165 {
166 LIST_HEAD(dispose);
167 unsigned long freed;
168
169 if (!(sc->gfp_mask & __GFP_FS))
170 return SHRINK_STOP;
171
172 freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
173 gfs2_qd_isolate, &dispose);
174
175 gfs2_qd_dispose(&dispose);
176
177 return freed;
178 }
179
gfs2_qd_shrink_count(struct shrinker * shrink,struct shrink_control * sc)180 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
181 struct shrink_control *sc)
182 {
183 return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
184 }
185
186 struct shrinker gfs2_qd_shrinker = {
187 .count_objects = gfs2_qd_shrink_count,
188 .scan_objects = gfs2_qd_shrink_scan,
189 .seeks = DEFAULT_SEEKS,
190 .flags = SHRINKER_NUMA_AWARE,
191 };
192
193
qd2index(struct gfs2_quota_data * qd)194 static u64 qd2index(struct gfs2_quota_data *qd)
195 {
196 struct kqid qid = qd->qd_id;
197 return (2 * (u64)from_kqid(&init_user_ns, qid)) +
198 ((qid.type == USRQUOTA) ? 0 : 1);
199 }
200
qd2offset(struct gfs2_quota_data * qd)201 static u64 qd2offset(struct gfs2_quota_data *qd)
202 {
203 u64 offset;
204
205 offset = qd2index(qd);
206 offset *= sizeof(struct gfs2_quota);
207
208 return offset;
209 }
210
qd_alloc(unsigned hash,struct gfs2_sbd * sdp,struct kqid qid)211 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
212 {
213 struct gfs2_quota_data *qd;
214 int error;
215
216 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
217 if (!qd)
218 return NULL;
219
220 qd->qd_sbd = sdp;
221 qd->qd_lockref.count = 1;
222 spin_lock_init(&qd->qd_lockref.lock);
223 qd->qd_id = qid;
224 qd->qd_slot = -1;
225 INIT_LIST_HEAD(&qd->qd_lru);
226 qd->qd_hash = hash;
227
228 error = gfs2_glock_get(sdp, qd2index(qd),
229 &gfs2_quota_glops, CREATE, &qd->qd_gl);
230 if (error)
231 goto fail;
232
233 return qd;
234
235 fail:
236 kmem_cache_free(gfs2_quotad_cachep, qd);
237 return NULL;
238 }
239
gfs2_qd_search_bucket(unsigned int hash,const struct gfs2_sbd * sdp,struct kqid qid)240 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
241 const struct gfs2_sbd *sdp,
242 struct kqid qid)
243 {
244 struct gfs2_quota_data *qd;
245 struct hlist_bl_node *h;
246
247 hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
248 if (!qid_eq(qd->qd_id, qid))
249 continue;
250 if (qd->qd_sbd != sdp)
251 continue;
252 if (lockref_get_not_dead(&qd->qd_lockref)) {
253 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
254 return qd;
255 }
256 }
257
258 return NULL;
259 }
260
261
qd_get(struct gfs2_sbd * sdp,struct kqid qid,struct gfs2_quota_data ** qdp)262 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
263 struct gfs2_quota_data **qdp)
264 {
265 struct gfs2_quota_data *qd, *new_qd;
266 unsigned int hash = gfs2_qd_hash(sdp, qid);
267
268 rcu_read_lock();
269 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
270 rcu_read_unlock();
271
272 if (qd)
273 return 0;
274
275 new_qd = qd_alloc(hash, sdp, qid);
276 if (!new_qd)
277 return -ENOMEM;
278
279 spin_lock(&qd_lock);
280 spin_lock_bucket(hash);
281 *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
282 if (qd == NULL) {
283 *qdp = new_qd;
284 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
285 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
286 atomic_inc(&sdp->sd_quota_count);
287 }
288 spin_unlock_bucket(hash);
289 spin_unlock(&qd_lock);
290
291 if (qd) {
292 gfs2_glock_put(new_qd->qd_gl);
293 kmem_cache_free(gfs2_quotad_cachep, new_qd);
294 }
295
296 return 0;
297 }
298
299
qd_hold(struct gfs2_quota_data * qd)300 static void qd_hold(struct gfs2_quota_data *qd)
301 {
302 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
303 gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
304 lockref_get(&qd->qd_lockref);
305 }
306
qd_put(struct gfs2_quota_data * qd)307 static void qd_put(struct gfs2_quota_data *qd)
308 {
309 if (lockref_put_or_lock(&qd->qd_lockref))
310 return;
311
312 qd->qd_lockref.count = 0;
313 list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
314 spin_unlock(&qd->qd_lockref.lock);
315
316 }
317
slot_get(struct gfs2_quota_data * qd)318 static int slot_get(struct gfs2_quota_data *qd)
319 {
320 struct gfs2_sbd *sdp = qd->qd_sbd;
321 unsigned int bit;
322 int error = 0;
323
324 spin_lock(&sdp->sd_bitmap_lock);
325 if (qd->qd_slot_count != 0)
326 goto out;
327
328 error = -ENOSPC;
329 bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
330 if (bit < sdp->sd_quota_slots) {
331 set_bit(bit, sdp->sd_quota_bitmap);
332 qd->qd_slot = bit;
333 error = 0;
334 out:
335 qd->qd_slot_count++;
336 }
337 spin_unlock(&sdp->sd_bitmap_lock);
338
339 return error;
340 }
341
slot_hold(struct gfs2_quota_data * qd)342 static void slot_hold(struct gfs2_quota_data *qd)
343 {
344 struct gfs2_sbd *sdp = qd->qd_sbd;
345
346 spin_lock(&sdp->sd_bitmap_lock);
347 gfs2_assert(sdp, qd->qd_slot_count);
348 qd->qd_slot_count++;
349 spin_unlock(&sdp->sd_bitmap_lock);
350 }
351
slot_put(struct gfs2_quota_data * qd)352 static void slot_put(struct gfs2_quota_data *qd)
353 {
354 struct gfs2_sbd *sdp = qd->qd_sbd;
355
356 spin_lock(&sdp->sd_bitmap_lock);
357 gfs2_assert(sdp, qd->qd_slot_count);
358 if (!--qd->qd_slot_count) {
359 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
360 qd->qd_slot = -1;
361 }
362 spin_unlock(&sdp->sd_bitmap_lock);
363 }
364
bh_get(struct gfs2_quota_data * qd)365 static int bh_get(struct gfs2_quota_data *qd)
366 {
367 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
368 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
369 unsigned int block, offset;
370 struct buffer_head *bh;
371 int error;
372 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
373
374 mutex_lock(&sdp->sd_quota_mutex);
375
376 if (qd->qd_bh_count++) {
377 mutex_unlock(&sdp->sd_quota_mutex);
378 return 0;
379 }
380
381 block = qd->qd_slot / sdp->sd_qc_per_block;
382 offset = qd->qd_slot % sdp->sd_qc_per_block;
383
384 bh_map.b_size = BIT(ip->i_inode.i_blkbits);
385 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
386 if (error)
387 goto fail;
388 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, 0, &bh);
389 if (error)
390 goto fail;
391 error = -EIO;
392 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
393 goto fail_brelse;
394
395 qd->qd_bh = bh;
396 qd->qd_bh_qc = (struct gfs2_quota_change *)
397 (bh->b_data + sizeof(struct gfs2_meta_header) +
398 offset * sizeof(struct gfs2_quota_change));
399
400 mutex_unlock(&sdp->sd_quota_mutex);
401
402 return 0;
403
404 fail_brelse:
405 brelse(bh);
406 fail:
407 qd->qd_bh_count--;
408 mutex_unlock(&sdp->sd_quota_mutex);
409 return error;
410 }
411
bh_put(struct gfs2_quota_data * qd)412 static void bh_put(struct gfs2_quota_data *qd)
413 {
414 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
415
416 mutex_lock(&sdp->sd_quota_mutex);
417 gfs2_assert(sdp, qd->qd_bh_count);
418 if (!--qd->qd_bh_count) {
419 brelse(qd->qd_bh);
420 qd->qd_bh = NULL;
421 qd->qd_bh_qc = NULL;
422 }
423 mutex_unlock(&sdp->sd_quota_mutex);
424 }
425
qd_check_sync(struct gfs2_sbd * sdp,struct gfs2_quota_data * qd,u64 * sync_gen)426 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
427 u64 *sync_gen)
428 {
429 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
430 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
431 (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
432 return 0;
433
434 /*
435 * If qd_change is 0 it means a pending quota change was negated.
436 * We should not sync it, but we still have a qd reference and slot
437 * reference taken by gfs2_quota_change -> do_qc that need to be put.
438 */
439 if (!qd->qd_change && test_and_clear_bit(QDF_CHANGE, &qd->qd_flags)) {
440 slot_put(qd);
441 qd_put(qd);
442 return 0;
443 }
444
445 if (!lockref_get_not_dead(&qd->qd_lockref))
446 return 0;
447
448 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
449 set_bit(QDF_LOCKED, &qd->qd_flags);
450 qd->qd_change_sync = qd->qd_change;
451 slot_hold(qd);
452 return 1;
453 }
454
qd_fish(struct gfs2_sbd * sdp,struct gfs2_quota_data ** qdp)455 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
456 {
457 struct gfs2_quota_data *qd = NULL;
458 int error;
459 int found = 0;
460
461 *qdp = NULL;
462
463 if (sb_rdonly(sdp->sd_vfs))
464 return 0;
465
466 spin_lock(&qd_lock);
467
468 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
469 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
470 if (found)
471 break;
472 }
473
474 if (!found)
475 qd = NULL;
476
477 spin_unlock(&qd_lock);
478
479 if (qd) {
480 gfs2_assert_warn(sdp, qd->qd_change_sync);
481 error = bh_get(qd);
482 if (error) {
483 clear_bit(QDF_LOCKED, &qd->qd_flags);
484 slot_put(qd);
485 qd_put(qd);
486 return error;
487 }
488 }
489
490 *qdp = qd;
491
492 return 0;
493 }
494
qd_unlock(struct gfs2_quota_data * qd)495 static void qd_unlock(struct gfs2_quota_data *qd)
496 {
497 gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd,
498 test_bit(QDF_LOCKED, &qd->qd_flags));
499 clear_bit(QDF_LOCKED, &qd->qd_flags);
500 bh_put(qd);
501 slot_put(qd);
502 qd_put(qd);
503 }
504
qdsb_get(struct gfs2_sbd * sdp,struct kqid qid,struct gfs2_quota_data ** qdp)505 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
506 struct gfs2_quota_data **qdp)
507 {
508 int error;
509
510 error = qd_get(sdp, qid, qdp);
511 if (error)
512 return error;
513
514 error = slot_get(*qdp);
515 if (error)
516 goto fail;
517
518 error = bh_get(*qdp);
519 if (error)
520 goto fail_slot;
521
522 return 0;
523
524 fail_slot:
525 slot_put(*qdp);
526 fail:
527 qd_put(*qdp);
528 return error;
529 }
530
qdsb_put(struct gfs2_quota_data * qd)531 static void qdsb_put(struct gfs2_quota_data *qd)
532 {
533 bh_put(qd);
534 slot_put(qd);
535 qd_put(qd);
536 }
537
538 /**
539 * gfs2_qa_get - make sure we have a quota allocations data structure,
540 * if necessary
541 * @ip: the inode for this reservation
542 */
gfs2_qa_get(struct gfs2_inode * ip)543 int gfs2_qa_get(struct gfs2_inode *ip)
544 {
545 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
546 struct inode *inode = &ip->i_inode;
547
548 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
549 return 0;
550
551 spin_lock(&inode->i_lock);
552 if (ip->i_qadata == NULL) {
553 struct gfs2_qadata *tmp;
554
555 spin_unlock(&inode->i_lock);
556 tmp = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
557 if (!tmp)
558 return -ENOMEM;
559
560 spin_lock(&inode->i_lock);
561 if (ip->i_qadata == NULL)
562 ip->i_qadata = tmp;
563 else
564 kmem_cache_free(gfs2_qadata_cachep, tmp);
565 }
566 ip->i_qadata->qa_ref++;
567 spin_unlock(&inode->i_lock);
568 return 0;
569 }
570
gfs2_qa_put(struct gfs2_inode * ip)571 void gfs2_qa_put(struct gfs2_inode *ip)
572 {
573 struct inode *inode = &ip->i_inode;
574
575 spin_lock(&inode->i_lock);
576 if (ip->i_qadata && --ip->i_qadata->qa_ref == 0) {
577 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
578 ip->i_qadata = NULL;
579 }
580 spin_unlock(&inode->i_lock);
581 }
582
gfs2_quota_hold(struct gfs2_inode * ip,kuid_t uid,kgid_t gid)583 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
584 {
585 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
586 struct gfs2_quota_data **qd;
587 int error;
588
589 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
590 return 0;
591
592 error = gfs2_qa_get(ip);
593 if (error)
594 return error;
595
596 qd = ip->i_qadata->qa_qd;
597
598 if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
599 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) {
600 error = -EIO;
601 goto out;
602 }
603
604 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
605 if (error)
606 goto out_unhold;
607 ip->i_qadata->qa_qd_num++;
608 qd++;
609
610 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
611 if (error)
612 goto out_unhold;
613 ip->i_qadata->qa_qd_num++;
614 qd++;
615
616 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
617 !uid_eq(uid, ip->i_inode.i_uid)) {
618 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
619 if (error)
620 goto out_unhold;
621 ip->i_qadata->qa_qd_num++;
622 qd++;
623 }
624
625 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
626 !gid_eq(gid, ip->i_inode.i_gid)) {
627 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
628 if (error)
629 goto out_unhold;
630 ip->i_qadata->qa_qd_num++;
631 qd++;
632 }
633
634 out_unhold:
635 if (error)
636 gfs2_quota_unhold(ip);
637 out:
638 return error;
639 }
640
gfs2_quota_unhold(struct gfs2_inode * ip)641 void gfs2_quota_unhold(struct gfs2_inode *ip)
642 {
643 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
644 u32 x;
645
646 if (ip->i_qadata == NULL)
647 return;
648
649 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
650
651 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
652 qdsb_put(ip->i_qadata->qa_qd[x]);
653 ip->i_qadata->qa_qd[x] = NULL;
654 }
655 ip->i_qadata->qa_qd_num = 0;
656 gfs2_qa_put(ip);
657 }
658
sort_qd(const void * a,const void * b)659 static int sort_qd(const void *a, const void *b)
660 {
661 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
662 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
663
664 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
665 return -1;
666 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
667 return 1;
668 return 0;
669 }
670
do_qc(struct gfs2_quota_data * qd,s64 change)671 static void do_qc(struct gfs2_quota_data *qd, s64 change)
672 {
673 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
674 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
675 struct gfs2_quota_change *qc = qd->qd_bh_qc;
676 s64 x;
677
678 mutex_lock(&sdp->sd_quota_mutex);
679 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
680
681 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
682 qc->qc_change = 0;
683 qc->qc_flags = 0;
684 if (qd->qd_id.type == USRQUOTA)
685 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
686 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
687 }
688
689 x = be64_to_cpu(qc->qc_change) + change;
690 qc->qc_change = cpu_to_be64(x);
691
692 spin_lock(&qd_lock);
693 qd->qd_change = x;
694 spin_unlock(&qd_lock);
695
696 if (!x) {
697 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
698 clear_bit(QDF_CHANGE, &qd->qd_flags);
699 qc->qc_flags = 0;
700 qc->qc_id = 0;
701 slot_put(qd);
702 qd_put(qd);
703 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
704 qd_hold(qd);
705 slot_hold(qd);
706 }
707
708 if (change < 0) /* Reset quiet flag if we freed some blocks */
709 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
710 mutex_unlock(&sdp->sd_quota_mutex);
711 }
712
gfs2_write_buf_to_page(struct gfs2_inode * ip,unsigned long index,unsigned off,void * buf,unsigned bytes)713 static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
714 unsigned off, void *buf, unsigned bytes)
715 {
716 struct inode *inode = &ip->i_inode;
717 struct gfs2_sbd *sdp = GFS2_SB(inode);
718 struct address_space *mapping = inode->i_mapping;
719 struct page *page;
720 struct buffer_head *bh;
721 void *kaddr;
722 u64 blk;
723 unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
724 unsigned to_write = bytes, pg_off = off;
725 int done = 0;
726
727 blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
728 boff = off % bsize;
729
730 page = find_or_create_page(mapping, index, GFP_NOFS);
731 if (!page)
732 return -ENOMEM;
733 if (!page_has_buffers(page))
734 create_empty_buffers(page, bsize, 0);
735
736 bh = page_buffers(page);
737 while (!done) {
738 /* Find the beginning block within the page */
739 if (pg_off >= ((bnum * bsize) + bsize)) {
740 bh = bh->b_this_page;
741 bnum++;
742 blk++;
743 continue;
744 }
745 if (!buffer_mapped(bh)) {
746 gfs2_block_map(inode, blk, bh, 1);
747 if (!buffer_mapped(bh))
748 goto unlock_out;
749 /* If it's a newly allocated disk block, zero it */
750 if (buffer_new(bh))
751 zero_user(page, bnum * bsize, bh->b_size);
752 }
753 if (PageUptodate(page))
754 set_buffer_uptodate(bh);
755 if (!buffer_uptodate(bh)) {
756 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &bh);
757 wait_on_buffer(bh);
758 if (!buffer_uptodate(bh))
759 goto unlock_out;
760 }
761 if (gfs2_is_jdata(ip))
762 gfs2_trans_add_data(ip->i_gl, bh);
763 else
764 gfs2_ordered_add_inode(ip);
765
766 /* If we need to write to the next block as well */
767 if (to_write > (bsize - boff)) {
768 pg_off += (bsize - boff);
769 to_write -= (bsize - boff);
770 boff = pg_off % bsize;
771 continue;
772 }
773 done = 1;
774 }
775
776 /* Write to the page, now that we have setup the buffer(s) */
777 kaddr = kmap_atomic(page);
778 memcpy(kaddr + off, buf, bytes);
779 flush_dcache_page(page);
780 kunmap_atomic(kaddr);
781 unlock_page(page);
782 put_page(page);
783
784 return 0;
785
786 unlock_out:
787 unlock_page(page);
788 put_page(page);
789 return -EIO;
790 }
791
gfs2_write_disk_quota(struct gfs2_inode * ip,struct gfs2_quota * qp,loff_t loc)792 static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
793 loff_t loc)
794 {
795 unsigned long pg_beg;
796 unsigned pg_off, nbytes, overflow = 0;
797 int pg_oflow = 0, error;
798 void *ptr;
799
800 nbytes = sizeof(struct gfs2_quota);
801
802 pg_beg = loc >> PAGE_SHIFT;
803 pg_off = offset_in_page(loc);
804
805 /* If the quota straddles a page boundary, split the write in two */
806 if ((pg_off + nbytes) > PAGE_SIZE) {
807 pg_oflow = 1;
808 overflow = (pg_off + nbytes) - PAGE_SIZE;
809 }
810
811 ptr = qp;
812 error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
813 nbytes - overflow);
814 /* If there's an overflow, write the remaining bytes to the next page */
815 if (!error && pg_oflow)
816 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
817 ptr + nbytes - overflow,
818 overflow);
819 return error;
820 }
821
822 /**
823 * gfs2_adjust_quota - adjust record of current block usage
824 * @ip: The quota inode
825 * @loc: Offset of the entry in the quota file
826 * @change: The amount of usage change to record
827 * @qd: The quota data
828 * @fdq: The updated limits to record
829 *
830 * This function was mostly borrowed from gfs2_block_truncate_page which was
831 * in turn mostly borrowed from ext3
832 *
833 * Returns: 0 or -ve on error
834 */
835
gfs2_adjust_quota(struct gfs2_inode * ip,loff_t loc,s64 change,struct gfs2_quota_data * qd,struct qc_dqblk * fdq)836 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
837 s64 change, struct gfs2_quota_data *qd,
838 struct qc_dqblk *fdq)
839 {
840 struct inode *inode = &ip->i_inode;
841 struct gfs2_sbd *sdp = GFS2_SB(inode);
842 struct gfs2_quota q;
843 int err;
844 u64 size;
845
846 if (gfs2_is_stuffed(ip)) {
847 err = gfs2_unstuff_dinode(ip, NULL);
848 if (err)
849 return err;
850 }
851
852 memset(&q, 0, sizeof(struct gfs2_quota));
853 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
854 if (err < 0)
855 return err;
856
857 loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
858 err = -EIO;
859 be64_add_cpu(&q.qu_value, change);
860 if (((s64)be64_to_cpu(q.qu_value)) < 0)
861 q.qu_value = 0; /* Never go negative on quota usage */
862 qd->qd_qb.qb_value = q.qu_value;
863 if (fdq) {
864 if (fdq->d_fieldmask & QC_SPC_SOFT) {
865 q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
866 qd->qd_qb.qb_warn = q.qu_warn;
867 }
868 if (fdq->d_fieldmask & QC_SPC_HARD) {
869 q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
870 qd->qd_qb.qb_limit = q.qu_limit;
871 }
872 if (fdq->d_fieldmask & QC_SPACE) {
873 q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
874 qd->qd_qb.qb_value = q.qu_value;
875 }
876 }
877
878 err = gfs2_write_disk_quota(ip, &q, loc);
879 if (!err) {
880 size = loc + sizeof(struct gfs2_quota);
881 if (size > inode->i_size)
882 i_size_write(inode, size);
883 inode->i_mtime = inode->i_atime = current_time(inode);
884 mark_inode_dirty(inode);
885 set_bit(QDF_REFRESH, &qd->qd_flags);
886 }
887
888 return err;
889 }
890
do_sync(unsigned int num_qd,struct gfs2_quota_data ** qda)891 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
892 {
893 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd;
894 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
895 struct gfs2_alloc_parms ap = { .aflags = 0, };
896 unsigned int data_blocks, ind_blocks;
897 struct gfs2_holder *ghs, i_gh;
898 unsigned int qx, x;
899 struct gfs2_quota_data *qd;
900 unsigned reserved;
901 loff_t offset;
902 unsigned int nalloc = 0, blocks;
903 int error;
904
905 error = gfs2_qa_get(ip);
906 if (error)
907 return error;
908
909 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
910 &data_blocks, &ind_blocks);
911
912 ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
913 if (!ghs) {
914 error = -ENOMEM;
915 goto out;
916 }
917
918 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
919 inode_lock(&ip->i_inode);
920 for (qx = 0; qx < num_qd; qx++) {
921 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
922 GL_NOCACHE, &ghs[qx]);
923 if (error)
924 goto out_dq;
925 }
926
927 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
928 if (error)
929 goto out_dq;
930
931 for (x = 0; x < num_qd; x++) {
932 offset = qd2offset(qda[x]);
933 if (gfs2_write_alloc_required(ip, offset,
934 sizeof(struct gfs2_quota)))
935 nalloc++;
936 }
937
938 /*
939 * 1 blk for unstuffing inode if stuffed. We add this extra
940 * block to the reservation unconditionally. If the inode
941 * doesn't need unstuffing, the block will be released to the
942 * rgrp since it won't be allocated during the transaction
943 */
944 /* +3 in the end for unstuffing block, inode size update block
945 * and another block in case quota straddles page boundary and
946 * two blocks need to be updated instead of 1 */
947 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
948
949 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
950 ap.target = reserved;
951 error = gfs2_inplace_reserve(ip, &ap);
952 if (error)
953 goto out_alloc;
954
955 if (nalloc)
956 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
957
958 error = gfs2_trans_begin(sdp, blocks, 0);
959 if (error)
960 goto out_ipres;
961
962 for (x = 0; x < num_qd; x++) {
963 qd = qda[x];
964 offset = qd2offset(qd);
965 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
966 if (error)
967 goto out_end_trans;
968
969 do_qc(qd, -qd->qd_change_sync);
970 set_bit(QDF_REFRESH, &qd->qd_flags);
971 }
972
973 error = 0;
974
975 out_end_trans:
976 gfs2_trans_end(sdp);
977 out_ipres:
978 gfs2_inplace_release(ip);
979 out_alloc:
980 gfs2_glock_dq_uninit(&i_gh);
981 out_dq:
982 while (qx--)
983 gfs2_glock_dq_uninit(&ghs[qx]);
984 inode_unlock(&ip->i_inode);
985 kfree(ghs);
986 gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
987 GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
988 out:
989 gfs2_qa_put(ip);
990 return error;
991 }
992
update_qd(struct gfs2_sbd * sdp,struct gfs2_quota_data * qd)993 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
994 {
995 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
996 struct gfs2_quota q;
997 struct gfs2_quota_lvb *qlvb;
998 loff_t pos;
999 int error;
1000
1001 memset(&q, 0, sizeof(struct gfs2_quota));
1002 pos = qd2offset(qd);
1003 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
1004 if (error < 0)
1005 return error;
1006
1007 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1008 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
1009 qlvb->__pad = 0;
1010 qlvb->qb_limit = q.qu_limit;
1011 qlvb->qb_warn = q.qu_warn;
1012 qlvb->qb_value = q.qu_value;
1013 qd->qd_qb = *qlvb;
1014
1015 return 0;
1016 }
1017
do_glock(struct gfs2_quota_data * qd,int force_refresh,struct gfs2_holder * q_gh)1018 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
1019 struct gfs2_holder *q_gh)
1020 {
1021 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1022 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1023 struct gfs2_holder i_gh;
1024 int error;
1025
1026 restart:
1027 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
1028 if (error)
1029 return error;
1030
1031 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1032 force_refresh = FORCE;
1033
1034 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1035
1036 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1037 gfs2_glock_dq_uninit(q_gh);
1038 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1039 GL_NOCACHE, q_gh);
1040 if (error)
1041 return error;
1042
1043 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1044 if (error)
1045 goto fail;
1046
1047 error = update_qd(sdp, qd);
1048 if (error)
1049 goto fail_gunlock;
1050
1051 gfs2_glock_dq_uninit(&i_gh);
1052 gfs2_glock_dq_uninit(q_gh);
1053 force_refresh = 0;
1054 goto restart;
1055 }
1056
1057 return 0;
1058
1059 fail_gunlock:
1060 gfs2_glock_dq_uninit(&i_gh);
1061 fail:
1062 gfs2_glock_dq_uninit(q_gh);
1063 return error;
1064 }
1065
gfs2_quota_lock(struct gfs2_inode * ip,kuid_t uid,kgid_t gid)1066 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1067 {
1068 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1069 struct gfs2_quota_data *qd;
1070 u32 x;
1071 int error = 0;
1072
1073 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1074 return 0;
1075
1076 error = gfs2_quota_hold(ip, uid, gid);
1077 if (error)
1078 return error;
1079
1080 sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1081 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1082
1083 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1084 qd = ip->i_qadata->qa_qd[x];
1085 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1086 if (error)
1087 break;
1088 }
1089
1090 if (!error)
1091 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1092 else {
1093 while (x--)
1094 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1095 gfs2_quota_unhold(ip);
1096 }
1097
1098 return error;
1099 }
1100
need_sync(struct gfs2_quota_data * qd)1101 static int need_sync(struct gfs2_quota_data *qd)
1102 {
1103 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1104 struct gfs2_tune *gt = &sdp->sd_tune;
1105 s64 value;
1106 unsigned int num, den;
1107 int do_sync = 1;
1108
1109 if (!qd->qd_qb.qb_limit)
1110 return 0;
1111
1112 spin_lock(&qd_lock);
1113 value = qd->qd_change;
1114 spin_unlock(&qd_lock);
1115
1116 spin_lock(>->gt_spin);
1117 num = gt->gt_quota_scale_num;
1118 den = gt->gt_quota_scale_den;
1119 spin_unlock(>->gt_spin);
1120
1121 if (value < 0)
1122 do_sync = 0;
1123 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1124 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1125 do_sync = 0;
1126 else {
1127 value *= gfs2_jindex_size(sdp) * num;
1128 value = div_s64(value, den);
1129 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1130 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1131 do_sync = 0;
1132 }
1133
1134 return do_sync;
1135 }
1136
gfs2_quota_unlock(struct gfs2_inode * ip)1137 void gfs2_quota_unlock(struct gfs2_inode *ip)
1138 {
1139 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1140 struct gfs2_quota_data *qda[4];
1141 unsigned int count = 0;
1142 u32 x;
1143 int found;
1144
1145 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1146 return;
1147
1148 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1149 struct gfs2_quota_data *qd;
1150 int sync;
1151
1152 qd = ip->i_qadata->qa_qd[x];
1153 sync = need_sync(qd);
1154
1155 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1156 if (!sync)
1157 continue;
1158
1159 spin_lock(&qd_lock);
1160 found = qd_check_sync(sdp, qd, NULL);
1161 spin_unlock(&qd_lock);
1162
1163 if (!found)
1164 continue;
1165
1166 gfs2_assert_warn(sdp, qd->qd_change_sync);
1167 if (bh_get(qd)) {
1168 clear_bit(QDF_LOCKED, &qd->qd_flags);
1169 slot_put(qd);
1170 qd_put(qd);
1171 continue;
1172 }
1173
1174 qda[count++] = qd;
1175 }
1176
1177 if (count) {
1178 do_sync(count, qda);
1179 for (x = 0; x < count; x++)
1180 qd_unlock(qda[x]);
1181 }
1182
1183 gfs2_quota_unhold(ip);
1184 }
1185
1186 #define MAX_LINE 256
1187
print_message(struct gfs2_quota_data * qd,char * type)1188 static int print_message(struct gfs2_quota_data *qd, char *type)
1189 {
1190 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1191
1192 fs_info(sdp, "quota %s for %s %u\n",
1193 type,
1194 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1195 from_kqid(&init_user_ns, qd->qd_id));
1196
1197 return 0;
1198 }
1199
1200 /**
1201 * gfs2_quota_check - check if allocating new blocks will exceed quota
1202 * @ip: The inode for which this check is being performed
1203 * @uid: The uid to check against
1204 * @gid: The gid to check against
1205 * @ap: The allocation parameters. ap->target contains the requested
1206 * blocks. ap->min_target, if set, contains the minimum blks
1207 * requested.
1208 *
1209 * Returns: 0 on success.
1210 * min_req = ap->min_target ? ap->min_target : ap->target;
1211 * quota must allow at least min_req blks for success and
1212 * ap->allowed is set to the number of blocks allowed
1213 *
1214 * -EDQUOT otherwise, quota violation. ap->allowed is set to number
1215 * of blocks available.
1216 */
gfs2_quota_check(struct gfs2_inode * ip,kuid_t uid,kgid_t gid,struct gfs2_alloc_parms * ap)1217 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1218 struct gfs2_alloc_parms *ap)
1219 {
1220 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1221 struct gfs2_quota_data *qd;
1222 s64 value, warn, limit;
1223 u32 x;
1224 int error = 0;
1225
1226 ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1227 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1228 return 0;
1229
1230 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1231 qd = ip->i_qadata->qa_qd[x];
1232
1233 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1234 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1235 continue;
1236
1237 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1238 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1239 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1240 spin_lock(&qd_lock);
1241 value += qd->qd_change;
1242 spin_unlock(&qd_lock);
1243
1244 if (limit > 0 && (limit - value) < ap->allowed)
1245 ap->allowed = limit - value;
1246 /* If we can't meet the target */
1247 if (limit && limit < (value + (s64)ap->target)) {
1248 /* If no min_target specified or we don't meet
1249 * min_target, return -EDQUOT */
1250 if (!ap->min_target || ap->min_target > ap->allowed) {
1251 if (!test_and_set_bit(QDF_QMSG_QUIET,
1252 &qd->qd_flags)) {
1253 print_message(qd, "exceeded");
1254 quota_send_warning(qd->qd_id,
1255 sdp->sd_vfs->s_dev,
1256 QUOTA_NL_BHARDWARN);
1257 }
1258 error = -EDQUOT;
1259 break;
1260 }
1261 } else if (warn && warn < value &&
1262 time_after_eq(jiffies, qd->qd_last_warn +
1263 gfs2_tune_get(sdp, gt_quota_warn_period)
1264 * HZ)) {
1265 quota_send_warning(qd->qd_id,
1266 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1267 error = print_message(qd, "warning");
1268 qd->qd_last_warn = jiffies;
1269 }
1270 }
1271 return error;
1272 }
1273
gfs2_quota_change(struct gfs2_inode * ip,s64 change,kuid_t uid,kgid_t gid)1274 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1275 kuid_t uid, kgid_t gid)
1276 {
1277 struct gfs2_quota_data *qd;
1278 u32 x;
1279 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1280
1281 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
1282 gfs2_assert_warn(sdp, change))
1283 return;
1284 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1285 return;
1286
1287 if (gfs2_assert_withdraw(sdp, ip->i_qadata &&
1288 ip->i_qadata->qa_ref > 0))
1289 return;
1290 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1291 qd = ip->i_qadata->qa_qd[x];
1292
1293 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1294 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1295 do_qc(qd, change);
1296 }
1297 }
1298 }
1299
gfs2_quota_sync(struct super_block * sb,int type)1300 int gfs2_quota_sync(struct super_block *sb, int type)
1301 {
1302 struct gfs2_sbd *sdp = sb->s_fs_info;
1303 struct gfs2_quota_data **qda;
1304 unsigned int max_qd = PAGE_SIZE / sizeof(struct gfs2_holder);
1305 unsigned int num_qd;
1306 unsigned int x;
1307 int error = 0;
1308
1309 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1310 if (!qda)
1311 return -ENOMEM;
1312
1313 mutex_lock(&sdp->sd_quota_sync_mutex);
1314 sdp->sd_quota_sync_gen++;
1315
1316 do {
1317 num_qd = 0;
1318
1319 for (;;) {
1320 error = qd_fish(sdp, qda + num_qd);
1321 if (error || !qda[num_qd])
1322 break;
1323 if (++num_qd == max_qd)
1324 break;
1325 }
1326
1327 if (num_qd) {
1328 if (!error)
1329 error = do_sync(num_qd, qda);
1330 if (!error)
1331 for (x = 0; x < num_qd; x++)
1332 qda[x]->qd_sync_gen =
1333 sdp->sd_quota_sync_gen;
1334
1335 for (x = 0; x < num_qd; x++)
1336 qd_unlock(qda[x]);
1337 }
1338 } while (!error && num_qd == max_qd);
1339
1340 mutex_unlock(&sdp->sd_quota_sync_mutex);
1341 kfree(qda);
1342
1343 return error;
1344 }
1345
gfs2_quota_refresh(struct gfs2_sbd * sdp,struct kqid qid)1346 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1347 {
1348 struct gfs2_quota_data *qd;
1349 struct gfs2_holder q_gh;
1350 int error;
1351
1352 error = qd_get(sdp, qid, &qd);
1353 if (error)
1354 return error;
1355
1356 error = do_glock(qd, FORCE, &q_gh);
1357 if (!error)
1358 gfs2_glock_dq_uninit(&q_gh);
1359
1360 qd_put(qd);
1361 return error;
1362 }
1363
gfs2_quota_init(struct gfs2_sbd * sdp)1364 int gfs2_quota_init(struct gfs2_sbd *sdp)
1365 {
1366 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1367 u64 size = i_size_read(sdp->sd_qc_inode);
1368 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1369 unsigned int x, slot = 0;
1370 unsigned int found = 0;
1371 unsigned int hash;
1372 unsigned int bm_size;
1373 u64 dblock;
1374 u32 extlen = 0;
1375 int error;
1376
1377 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1378 return -EIO;
1379
1380 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1381 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1382 bm_size *= sizeof(unsigned long);
1383 error = -ENOMEM;
1384 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1385 if (sdp->sd_quota_bitmap == NULL)
1386 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1387 __GFP_ZERO);
1388 if (!sdp->sd_quota_bitmap)
1389 return error;
1390
1391 for (x = 0; x < blocks; x++) {
1392 struct buffer_head *bh;
1393 const struct gfs2_quota_change *qc;
1394 unsigned int y;
1395
1396 if (!extlen) {
1397 int new = 0;
1398 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1399 if (error)
1400 goto fail;
1401 }
1402 error = -EIO;
1403 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1404 if (!bh)
1405 goto fail;
1406 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1407 brelse(bh);
1408 goto fail;
1409 }
1410
1411 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1412 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1413 y++, slot++) {
1414 struct gfs2_quota_data *qd;
1415 s64 qc_change = be64_to_cpu(qc->qc_change);
1416 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1417 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1418 USRQUOTA : GRPQUOTA;
1419 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1420 be32_to_cpu(qc->qc_id));
1421 qc++;
1422 if (!qc_change)
1423 continue;
1424
1425 hash = gfs2_qd_hash(sdp, qc_id);
1426 qd = qd_alloc(hash, sdp, qc_id);
1427 if (qd == NULL) {
1428 brelse(bh);
1429 goto fail;
1430 }
1431
1432 set_bit(QDF_CHANGE, &qd->qd_flags);
1433 qd->qd_change = qc_change;
1434 qd->qd_slot = slot;
1435 qd->qd_slot_count = 1;
1436
1437 spin_lock(&qd_lock);
1438 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1439 list_add(&qd->qd_list, &sdp->sd_quota_list);
1440 atomic_inc(&sdp->sd_quota_count);
1441 spin_unlock(&qd_lock);
1442
1443 spin_lock_bucket(hash);
1444 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1445 spin_unlock_bucket(hash);
1446
1447 found++;
1448 }
1449
1450 brelse(bh);
1451 dblock++;
1452 extlen--;
1453 }
1454
1455 if (found)
1456 fs_info(sdp, "found %u quota changes\n", found);
1457
1458 return 0;
1459
1460 fail:
1461 gfs2_quota_cleanup(sdp);
1462 return error;
1463 }
1464
gfs2_quota_cleanup(struct gfs2_sbd * sdp)1465 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1466 {
1467 struct list_head *head = &sdp->sd_quota_list;
1468 struct gfs2_quota_data *qd;
1469
1470 spin_lock(&qd_lock);
1471 while (!list_empty(head)) {
1472 qd = list_last_entry(head, struct gfs2_quota_data, qd_list);
1473
1474 list_del(&qd->qd_list);
1475
1476 /* Also remove if this qd exists in the reclaim list */
1477 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1478 atomic_dec(&sdp->sd_quota_count);
1479 spin_unlock(&qd_lock);
1480
1481 spin_lock_bucket(qd->qd_hash);
1482 hlist_bl_del_rcu(&qd->qd_hlist);
1483 spin_unlock_bucket(qd->qd_hash);
1484
1485 gfs2_assert_warn(sdp, !qd->qd_change);
1486 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1487 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1488
1489 gfs2_glock_put(qd->qd_gl);
1490 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1491
1492 spin_lock(&qd_lock);
1493 }
1494 spin_unlock(&qd_lock);
1495
1496 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1497
1498 kvfree(sdp->sd_quota_bitmap);
1499 sdp->sd_quota_bitmap = NULL;
1500 }
1501
quotad_error(struct gfs2_sbd * sdp,const char * msg,int error)1502 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1503 {
1504 if (error == 0 || error == -EROFS)
1505 return;
1506 if (!gfs2_withdrawn(sdp)) {
1507 if (!cmpxchg(&sdp->sd_log_error, 0, error))
1508 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1509 wake_up(&sdp->sd_logd_waitq);
1510 }
1511 }
1512
quotad_check_timeo(struct gfs2_sbd * sdp,const char * msg,int (* fxn)(struct super_block * sb,int type),unsigned long t,unsigned long * timeo,unsigned int * new_timeo)1513 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1514 int (*fxn)(struct super_block *sb, int type),
1515 unsigned long t, unsigned long *timeo,
1516 unsigned int *new_timeo)
1517 {
1518 if (t >= *timeo) {
1519 int error = fxn(sdp->sd_vfs, 0);
1520 quotad_error(sdp, msg, error);
1521 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1522 } else {
1523 *timeo -= t;
1524 }
1525 }
1526
quotad_check_trunc_list(struct gfs2_sbd * sdp)1527 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1528 {
1529 struct gfs2_inode *ip;
1530
1531 while(1) {
1532 ip = NULL;
1533 spin_lock(&sdp->sd_trunc_lock);
1534 if (!list_empty(&sdp->sd_trunc_list)) {
1535 ip = list_first_entry(&sdp->sd_trunc_list,
1536 struct gfs2_inode, i_trunc_list);
1537 list_del_init(&ip->i_trunc_list);
1538 }
1539 spin_unlock(&sdp->sd_trunc_lock);
1540 if (ip == NULL)
1541 return;
1542 gfs2_glock_finish_truncate(ip);
1543 }
1544 }
1545
gfs2_wake_up_statfs(struct gfs2_sbd * sdp)1546 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1547 if (!sdp->sd_statfs_force_sync) {
1548 sdp->sd_statfs_force_sync = 1;
1549 wake_up(&sdp->sd_quota_wait);
1550 }
1551 }
1552
1553
1554 /**
1555 * gfs2_quotad - Write cached quota changes into the quota file
1556 * @sdp: Pointer to GFS2 superblock
1557 *
1558 */
1559
gfs2_quotad(void * data)1560 int gfs2_quotad(void *data)
1561 {
1562 struct gfs2_sbd *sdp = data;
1563 struct gfs2_tune *tune = &sdp->sd_tune;
1564 unsigned long statfs_timeo = 0;
1565 unsigned long quotad_timeo = 0;
1566 unsigned long t = 0;
1567 DEFINE_WAIT(wait);
1568 int empty;
1569
1570 while (!kthread_should_stop()) {
1571
1572 if (gfs2_withdrawn(sdp))
1573 goto bypass;
1574 /* Update the master statfs file */
1575 if (sdp->sd_statfs_force_sync) {
1576 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1577 quotad_error(sdp, "statfs", error);
1578 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1579 }
1580 else
1581 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1582 &statfs_timeo,
1583 &tune->gt_statfs_quantum);
1584
1585 /* Update quota file */
1586 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1587 "ad_timeo, &tune->gt_quota_quantum);
1588
1589 /* Check for & recover partially truncated inodes */
1590 quotad_check_trunc_list(sdp);
1591
1592 try_to_freeze();
1593
1594 bypass:
1595 t = min(quotad_timeo, statfs_timeo);
1596
1597 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1598 spin_lock(&sdp->sd_trunc_lock);
1599 empty = list_empty(&sdp->sd_trunc_list);
1600 spin_unlock(&sdp->sd_trunc_lock);
1601 if (empty && !sdp->sd_statfs_force_sync)
1602 t -= schedule_timeout(t);
1603 else
1604 t = 0;
1605 finish_wait(&sdp->sd_quota_wait, &wait);
1606 }
1607
1608 return 0;
1609 }
1610
gfs2_quota_get_state(struct super_block * sb,struct qc_state * state)1611 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1612 {
1613 struct gfs2_sbd *sdp = sb->s_fs_info;
1614
1615 memset(state, 0, sizeof(*state));
1616
1617 switch (sdp->sd_args.ar_quota) {
1618 case GFS2_QUOTA_ON:
1619 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1620 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1621 fallthrough;
1622 case GFS2_QUOTA_ACCOUNT:
1623 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1624 QCI_SYSFILE;
1625 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1626 QCI_SYSFILE;
1627 break;
1628 case GFS2_QUOTA_OFF:
1629 break;
1630 }
1631 if (sdp->sd_quota_inode) {
1632 state->s_state[USRQUOTA].ino =
1633 GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1634 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1635 }
1636 state->s_state[USRQUOTA].nextents = 1; /* unsupported */
1637 state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1638 state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1639 return 0;
1640 }
1641
gfs2_get_dqblk(struct super_block * sb,struct kqid qid,struct qc_dqblk * fdq)1642 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1643 struct qc_dqblk *fdq)
1644 {
1645 struct gfs2_sbd *sdp = sb->s_fs_info;
1646 struct gfs2_quota_lvb *qlvb;
1647 struct gfs2_quota_data *qd;
1648 struct gfs2_holder q_gh;
1649 int error;
1650
1651 memset(fdq, 0, sizeof(*fdq));
1652
1653 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1654 return -ESRCH; /* Crazy XFS error code */
1655
1656 if ((qid.type != USRQUOTA) &&
1657 (qid.type != GRPQUOTA))
1658 return -EINVAL;
1659
1660 error = qd_get(sdp, qid, &qd);
1661 if (error)
1662 return error;
1663 error = do_glock(qd, FORCE, &q_gh);
1664 if (error)
1665 goto out;
1666
1667 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1668 fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1669 fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1670 fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1671
1672 gfs2_glock_dq_uninit(&q_gh);
1673 out:
1674 qd_put(qd);
1675 return error;
1676 }
1677
1678 /* GFS2 only supports a subset of the XFS fields */
1679 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1680
gfs2_set_dqblk(struct super_block * sb,struct kqid qid,struct qc_dqblk * fdq)1681 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1682 struct qc_dqblk *fdq)
1683 {
1684 struct gfs2_sbd *sdp = sb->s_fs_info;
1685 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1686 struct gfs2_quota_data *qd;
1687 struct gfs2_holder q_gh, i_gh;
1688 unsigned int data_blocks, ind_blocks;
1689 unsigned int blocks = 0;
1690 int alloc_required;
1691 loff_t offset;
1692 int error;
1693
1694 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1695 return -ESRCH; /* Crazy XFS error code */
1696
1697 if ((qid.type != USRQUOTA) &&
1698 (qid.type != GRPQUOTA))
1699 return -EINVAL;
1700
1701 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1702 return -EINVAL;
1703
1704 error = qd_get(sdp, qid, &qd);
1705 if (error)
1706 return error;
1707
1708 error = gfs2_qa_get(ip);
1709 if (error)
1710 goto out_put;
1711
1712 inode_lock(&ip->i_inode);
1713 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1714 if (error)
1715 goto out_unlockput;
1716 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1717 if (error)
1718 goto out_q;
1719
1720 /* Check for existing entry, if none then alloc new blocks */
1721 error = update_qd(sdp, qd);
1722 if (error)
1723 goto out_i;
1724
1725 /* If nothing has changed, this is a no-op */
1726 if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1727 ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1728 fdq->d_fieldmask ^= QC_SPC_SOFT;
1729
1730 if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1731 ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1732 fdq->d_fieldmask ^= QC_SPC_HARD;
1733
1734 if ((fdq->d_fieldmask & QC_SPACE) &&
1735 ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1736 fdq->d_fieldmask ^= QC_SPACE;
1737
1738 if (fdq->d_fieldmask == 0)
1739 goto out_i;
1740
1741 offset = qd2offset(qd);
1742 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1743 if (gfs2_is_stuffed(ip))
1744 alloc_required = 1;
1745 if (alloc_required) {
1746 struct gfs2_alloc_parms ap = { .aflags = 0, };
1747 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1748 &data_blocks, &ind_blocks);
1749 blocks = 1 + data_blocks + ind_blocks;
1750 ap.target = blocks;
1751 error = gfs2_inplace_reserve(ip, &ap);
1752 if (error)
1753 goto out_i;
1754 blocks += gfs2_rg_blocks(ip, blocks);
1755 }
1756
1757 /* Some quotas span block boundaries and can update two blocks,
1758 adding an extra block to the transaction to handle such quotas */
1759 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1760 if (error)
1761 goto out_release;
1762
1763 /* Apply changes */
1764 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1765 if (!error)
1766 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1767
1768 gfs2_trans_end(sdp);
1769 out_release:
1770 if (alloc_required)
1771 gfs2_inplace_release(ip);
1772 out_i:
1773 gfs2_glock_dq_uninit(&i_gh);
1774 out_q:
1775 gfs2_glock_dq_uninit(&q_gh);
1776 out_unlockput:
1777 gfs2_qa_put(ip);
1778 inode_unlock(&ip->i_inode);
1779 out_put:
1780 qd_put(qd);
1781 return error;
1782 }
1783
1784 const struct quotactl_ops gfs2_quotactl_ops = {
1785 .quota_sync = gfs2_quota_sync,
1786 .get_state = gfs2_quota_get_state,
1787 .get_dqblk = gfs2_get_dqblk,
1788 .set_dqblk = gfs2_set_dqblk,
1789 };
1790
gfs2_quota_hash_init(void)1791 void __init gfs2_quota_hash_init(void)
1792 {
1793 unsigned i;
1794
1795 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1796 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1797 }
1798