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_entry(list->next, 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 if (!lockref_get_not_dead(&qd->qd_lockref))
435 return 0;
436
437 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
438 set_bit(QDF_LOCKED, &qd->qd_flags);
439 qd->qd_change_sync = qd->qd_change;
440 slot_hold(qd);
441 return 1;
442 }
443
qd_fish(struct gfs2_sbd * sdp,struct gfs2_quota_data ** qdp)444 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
445 {
446 struct gfs2_quota_data *qd = NULL;
447 int error;
448 int found = 0;
449
450 *qdp = NULL;
451
452 if (sb_rdonly(sdp->sd_vfs))
453 return 0;
454
455 spin_lock(&qd_lock);
456
457 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
458 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
459 if (found)
460 break;
461 }
462
463 if (!found)
464 qd = NULL;
465
466 spin_unlock(&qd_lock);
467
468 if (qd) {
469 gfs2_assert_warn(sdp, qd->qd_change_sync);
470 error = bh_get(qd);
471 if (error) {
472 clear_bit(QDF_LOCKED, &qd->qd_flags);
473 slot_put(qd);
474 qd_put(qd);
475 return error;
476 }
477 }
478
479 *qdp = qd;
480
481 return 0;
482 }
483
qd_unlock(struct gfs2_quota_data * qd)484 static void qd_unlock(struct gfs2_quota_data *qd)
485 {
486 gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd,
487 test_bit(QDF_LOCKED, &qd->qd_flags));
488 clear_bit(QDF_LOCKED, &qd->qd_flags);
489 bh_put(qd);
490 slot_put(qd);
491 qd_put(qd);
492 }
493
qdsb_get(struct gfs2_sbd * sdp,struct kqid qid,struct gfs2_quota_data ** qdp)494 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
495 struct gfs2_quota_data **qdp)
496 {
497 int error;
498
499 error = qd_get(sdp, qid, qdp);
500 if (error)
501 return error;
502
503 error = slot_get(*qdp);
504 if (error)
505 goto fail;
506
507 error = bh_get(*qdp);
508 if (error)
509 goto fail_slot;
510
511 return 0;
512
513 fail_slot:
514 slot_put(*qdp);
515 fail:
516 qd_put(*qdp);
517 return error;
518 }
519
qdsb_put(struct gfs2_quota_data * qd)520 static void qdsb_put(struct gfs2_quota_data *qd)
521 {
522 bh_put(qd);
523 slot_put(qd);
524 qd_put(qd);
525 }
526
527 /**
528 * gfs2_qa_alloc - make sure we have a quota allocations data structure,
529 * if necessary
530 * @ip: the inode for this reservation
531 */
gfs2_qa_alloc(struct gfs2_inode * ip)532 int gfs2_qa_alloc(struct gfs2_inode *ip)
533 {
534 int error = 0;
535 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
536
537 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
538 return 0;
539
540 down_write(&ip->i_rw_mutex);
541 if (ip->i_qadata == NULL) {
542 ip->i_qadata = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
543 if (!ip->i_qadata)
544 error = -ENOMEM;
545 }
546 up_write(&ip->i_rw_mutex);
547 return error;
548 }
549
gfs2_qa_delete(struct gfs2_inode * ip,atomic_t * wcount)550 void gfs2_qa_delete(struct gfs2_inode *ip, atomic_t *wcount)
551 {
552 down_write(&ip->i_rw_mutex);
553 if (ip->i_qadata && ((wcount == NULL) || (atomic_read(wcount) <= 1))) {
554 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
555 ip->i_qadata = NULL;
556 }
557 up_write(&ip->i_rw_mutex);
558 }
559
gfs2_quota_hold(struct gfs2_inode * ip,kuid_t uid,kgid_t gid)560 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
561 {
562 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
563 struct gfs2_quota_data **qd;
564 int error;
565
566 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
567 return 0;
568
569 if (ip->i_qadata == NULL) {
570 error = gfs2_rsqa_alloc(ip);
571 if (error)
572 return error;
573 }
574
575 qd = ip->i_qadata->qa_qd;
576
577 if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
578 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
579 return -EIO;
580
581 error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
582 if (error)
583 goto out;
584 ip->i_qadata->qa_qd_num++;
585 qd++;
586
587 error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
588 if (error)
589 goto out;
590 ip->i_qadata->qa_qd_num++;
591 qd++;
592
593 if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
594 !uid_eq(uid, ip->i_inode.i_uid)) {
595 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
596 if (error)
597 goto out;
598 ip->i_qadata->qa_qd_num++;
599 qd++;
600 }
601
602 if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
603 !gid_eq(gid, ip->i_inode.i_gid)) {
604 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
605 if (error)
606 goto out;
607 ip->i_qadata->qa_qd_num++;
608 qd++;
609 }
610
611 out:
612 if (error)
613 gfs2_quota_unhold(ip);
614 return error;
615 }
616
gfs2_quota_unhold(struct gfs2_inode * ip)617 void gfs2_quota_unhold(struct gfs2_inode *ip)
618 {
619 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
620 u32 x;
621
622 if (ip->i_qadata == NULL)
623 return;
624 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
625
626 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
627 qdsb_put(ip->i_qadata->qa_qd[x]);
628 ip->i_qadata->qa_qd[x] = NULL;
629 }
630 ip->i_qadata->qa_qd_num = 0;
631 }
632
sort_qd(const void * a,const void * b)633 static int sort_qd(const void *a, const void *b)
634 {
635 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
636 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
637
638 if (qid_lt(qd_a->qd_id, qd_b->qd_id))
639 return -1;
640 if (qid_lt(qd_b->qd_id, qd_a->qd_id))
641 return 1;
642 return 0;
643 }
644
do_qc(struct gfs2_quota_data * qd,s64 change)645 static void do_qc(struct gfs2_quota_data *qd, s64 change)
646 {
647 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
648 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
649 struct gfs2_quota_change *qc = qd->qd_bh_qc;
650 s64 x;
651
652 mutex_lock(&sdp->sd_quota_mutex);
653 gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
654
655 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
656 qc->qc_change = 0;
657 qc->qc_flags = 0;
658 if (qd->qd_id.type == USRQUOTA)
659 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
660 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
661 }
662
663 x = be64_to_cpu(qc->qc_change) + change;
664 qc->qc_change = cpu_to_be64(x);
665
666 spin_lock(&qd_lock);
667 qd->qd_change = x;
668 spin_unlock(&qd_lock);
669
670 if (!x) {
671 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
672 clear_bit(QDF_CHANGE, &qd->qd_flags);
673 qc->qc_flags = 0;
674 qc->qc_id = 0;
675 slot_put(qd);
676 qd_put(qd);
677 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
678 qd_hold(qd);
679 slot_hold(qd);
680 }
681
682 if (change < 0) /* Reset quiet flag if we freed some blocks */
683 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
684 mutex_unlock(&sdp->sd_quota_mutex);
685 }
686
gfs2_write_buf_to_page(struct gfs2_inode * ip,unsigned long index,unsigned off,void * buf,unsigned bytes)687 static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
688 unsigned off, void *buf, unsigned bytes)
689 {
690 struct inode *inode = &ip->i_inode;
691 struct gfs2_sbd *sdp = GFS2_SB(inode);
692 struct address_space *mapping = inode->i_mapping;
693 struct page *page;
694 struct buffer_head *bh;
695 void *kaddr;
696 u64 blk;
697 unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
698 unsigned to_write = bytes, pg_off = off;
699 int done = 0;
700
701 blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
702 boff = off % bsize;
703
704 page = find_or_create_page(mapping, index, GFP_NOFS);
705 if (!page)
706 return -ENOMEM;
707 if (!page_has_buffers(page))
708 create_empty_buffers(page, bsize, 0);
709
710 bh = page_buffers(page);
711 while (!done) {
712 /* Find the beginning block within the page */
713 if (pg_off >= ((bnum * bsize) + bsize)) {
714 bh = bh->b_this_page;
715 bnum++;
716 blk++;
717 continue;
718 }
719 if (!buffer_mapped(bh)) {
720 gfs2_block_map(inode, blk, bh, 1);
721 if (!buffer_mapped(bh))
722 goto unlock_out;
723 /* If it's a newly allocated disk block, zero it */
724 if (buffer_new(bh))
725 zero_user(page, bnum * bsize, bh->b_size);
726 }
727 if (PageUptodate(page))
728 set_buffer_uptodate(bh);
729 if (!buffer_uptodate(bh)) {
730 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &bh);
731 wait_on_buffer(bh);
732 if (!buffer_uptodate(bh))
733 goto unlock_out;
734 }
735 if (gfs2_is_jdata(ip))
736 gfs2_trans_add_data(ip->i_gl, bh);
737 else
738 gfs2_ordered_add_inode(ip);
739
740 /* If we need to write to the next block as well */
741 if (to_write > (bsize - boff)) {
742 pg_off += (bsize - boff);
743 to_write -= (bsize - boff);
744 boff = pg_off % bsize;
745 continue;
746 }
747 done = 1;
748 }
749
750 /* Write to the page, now that we have setup the buffer(s) */
751 kaddr = kmap_atomic(page);
752 memcpy(kaddr + off, buf, bytes);
753 flush_dcache_page(page);
754 kunmap_atomic(kaddr);
755 unlock_page(page);
756 put_page(page);
757
758 return 0;
759
760 unlock_out:
761 unlock_page(page);
762 put_page(page);
763 return -EIO;
764 }
765
gfs2_write_disk_quota(struct gfs2_inode * ip,struct gfs2_quota * qp,loff_t loc)766 static int gfs2_write_disk_quota(struct gfs2_inode *ip, struct gfs2_quota *qp,
767 loff_t loc)
768 {
769 unsigned long pg_beg;
770 unsigned pg_off, nbytes, overflow = 0;
771 int pg_oflow = 0, error;
772 void *ptr;
773
774 nbytes = sizeof(struct gfs2_quota);
775
776 pg_beg = loc >> PAGE_SHIFT;
777 pg_off = offset_in_page(loc);
778
779 /* If the quota straddles a page boundary, split the write in two */
780 if ((pg_off + nbytes) > PAGE_SIZE) {
781 pg_oflow = 1;
782 overflow = (pg_off + nbytes) - PAGE_SIZE;
783 }
784
785 ptr = qp;
786 error = gfs2_write_buf_to_page(ip, pg_beg, pg_off, ptr,
787 nbytes - overflow);
788 /* If there's an overflow, write the remaining bytes to the next page */
789 if (!error && pg_oflow)
790 error = gfs2_write_buf_to_page(ip, pg_beg + 1, 0,
791 ptr + nbytes - overflow,
792 overflow);
793 return error;
794 }
795
796 /**
797 * gfs2_adjust_quota - adjust record of current block usage
798 * @ip: The quota inode
799 * @loc: Offset of the entry in the quota file
800 * @change: The amount of usage change to record
801 * @qd: The quota data
802 * @fdq: The updated limits to record
803 *
804 * This function was mostly borrowed from gfs2_block_truncate_page which was
805 * in turn mostly borrowed from ext3
806 *
807 * Returns: 0 or -ve on error
808 */
809
gfs2_adjust_quota(struct gfs2_inode * ip,loff_t loc,s64 change,struct gfs2_quota_data * qd,struct qc_dqblk * fdq)810 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
811 s64 change, struct gfs2_quota_data *qd,
812 struct qc_dqblk *fdq)
813 {
814 struct inode *inode = &ip->i_inode;
815 struct gfs2_sbd *sdp = GFS2_SB(inode);
816 struct gfs2_quota q;
817 int err;
818 u64 size;
819
820 if (gfs2_is_stuffed(ip)) {
821 err = gfs2_unstuff_dinode(ip, NULL);
822 if (err)
823 return err;
824 }
825
826 memset(&q, 0, sizeof(struct gfs2_quota));
827 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
828 if (err < 0)
829 return err;
830
831 loc -= sizeof(q); /* gfs2_internal_read would've advanced the loc ptr */
832 err = -EIO;
833 be64_add_cpu(&q.qu_value, change);
834 if (((s64)be64_to_cpu(q.qu_value)) < 0)
835 q.qu_value = 0; /* Never go negative on quota usage */
836 qd->qd_qb.qb_value = q.qu_value;
837 if (fdq) {
838 if (fdq->d_fieldmask & QC_SPC_SOFT) {
839 q.qu_warn = cpu_to_be64(fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift);
840 qd->qd_qb.qb_warn = q.qu_warn;
841 }
842 if (fdq->d_fieldmask & QC_SPC_HARD) {
843 q.qu_limit = cpu_to_be64(fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift);
844 qd->qd_qb.qb_limit = q.qu_limit;
845 }
846 if (fdq->d_fieldmask & QC_SPACE) {
847 q.qu_value = cpu_to_be64(fdq->d_space >> sdp->sd_sb.sb_bsize_shift);
848 qd->qd_qb.qb_value = q.qu_value;
849 }
850 }
851
852 err = gfs2_write_disk_quota(ip, &q, loc);
853 if (!err) {
854 size = loc + sizeof(struct gfs2_quota);
855 if (size > inode->i_size)
856 i_size_write(inode, size);
857 inode->i_mtime = inode->i_atime = current_time(inode);
858 mark_inode_dirty(inode);
859 set_bit(QDF_REFRESH, &qd->qd_flags);
860 }
861
862 return err;
863 }
864
do_sync(unsigned int num_qd,struct gfs2_quota_data ** qda)865 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
866 {
867 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_name.ln_sbd;
868 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
869 struct gfs2_alloc_parms ap = { .aflags = 0, };
870 unsigned int data_blocks, ind_blocks;
871 struct gfs2_holder *ghs, i_gh;
872 unsigned int qx, x;
873 struct gfs2_quota_data *qd;
874 unsigned reserved;
875 loff_t offset;
876 unsigned int nalloc = 0, blocks;
877 int error;
878
879 error = gfs2_rsqa_alloc(ip);
880 if (error)
881 return error;
882
883 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
884 &data_blocks, &ind_blocks);
885
886 ghs = kmalloc_array(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
887 if (!ghs)
888 return -ENOMEM;
889
890 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
891 inode_lock(&ip->i_inode);
892 for (qx = 0; qx < num_qd; qx++) {
893 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
894 GL_NOCACHE, &ghs[qx]);
895 if (error)
896 goto out;
897 }
898
899 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
900 if (error)
901 goto out;
902
903 for (x = 0; x < num_qd; x++) {
904 offset = qd2offset(qda[x]);
905 if (gfs2_write_alloc_required(ip, offset,
906 sizeof(struct gfs2_quota)))
907 nalloc++;
908 }
909
910 /*
911 * 1 blk for unstuffing inode if stuffed. We add this extra
912 * block to the reservation unconditionally. If the inode
913 * doesn't need unstuffing, the block will be released to the
914 * rgrp since it won't be allocated during the transaction
915 */
916 /* +3 in the end for unstuffing block, inode size update block
917 * and another block in case quota straddles page boundary and
918 * two blocks need to be updated instead of 1 */
919 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
920
921 reserved = 1 + (nalloc * (data_blocks + ind_blocks));
922 ap.target = reserved;
923 error = gfs2_inplace_reserve(ip, &ap);
924 if (error)
925 goto out_alloc;
926
927 if (nalloc)
928 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
929
930 error = gfs2_trans_begin(sdp, blocks, 0);
931 if (error)
932 goto out_ipres;
933
934 for (x = 0; x < num_qd; x++) {
935 qd = qda[x];
936 offset = qd2offset(qd);
937 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
938 if (error)
939 goto out_end_trans;
940
941 do_qc(qd, -qd->qd_change_sync);
942 set_bit(QDF_REFRESH, &qd->qd_flags);
943 }
944
945 error = 0;
946
947 out_end_trans:
948 gfs2_trans_end(sdp);
949 out_ipres:
950 gfs2_inplace_release(ip);
951 out_alloc:
952 gfs2_glock_dq_uninit(&i_gh);
953 out:
954 while (qx--)
955 gfs2_glock_dq_uninit(&ghs[qx]);
956 inode_unlock(&ip->i_inode);
957 kfree(ghs);
958 gfs2_log_flush(ip->i_gl->gl_name.ln_sbd, ip->i_gl,
959 GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
960 return error;
961 }
962
update_qd(struct gfs2_sbd * sdp,struct gfs2_quota_data * qd)963 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
964 {
965 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
966 struct gfs2_quota q;
967 struct gfs2_quota_lvb *qlvb;
968 loff_t pos;
969 int error;
970
971 memset(&q, 0, sizeof(struct gfs2_quota));
972 pos = qd2offset(qd);
973 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
974 if (error < 0)
975 return error;
976
977 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
978 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
979 qlvb->__pad = 0;
980 qlvb->qb_limit = q.qu_limit;
981 qlvb->qb_warn = q.qu_warn;
982 qlvb->qb_value = q.qu_value;
983 qd->qd_qb = *qlvb;
984
985 return 0;
986 }
987
do_glock(struct gfs2_quota_data * qd,int force_refresh,struct gfs2_holder * q_gh)988 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
989 struct gfs2_holder *q_gh)
990 {
991 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
992 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
993 struct gfs2_holder i_gh;
994 int error;
995
996 restart:
997 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
998 if (error)
999 return error;
1000
1001 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1002 force_refresh = FORCE;
1003
1004 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1005
1006 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1007 gfs2_glock_dq_uninit(q_gh);
1008 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1009 GL_NOCACHE, q_gh);
1010 if (error)
1011 return error;
1012
1013 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1014 if (error)
1015 goto fail;
1016
1017 error = update_qd(sdp, qd);
1018 if (error)
1019 goto fail_gunlock;
1020
1021 gfs2_glock_dq_uninit(&i_gh);
1022 gfs2_glock_dq_uninit(q_gh);
1023 force_refresh = 0;
1024 goto restart;
1025 }
1026
1027 return 0;
1028
1029 fail_gunlock:
1030 gfs2_glock_dq_uninit(&i_gh);
1031 fail:
1032 gfs2_glock_dq_uninit(q_gh);
1033 return error;
1034 }
1035
gfs2_quota_lock(struct gfs2_inode * ip,kuid_t uid,kgid_t gid)1036 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1037 {
1038 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1039 struct gfs2_quota_data *qd;
1040 u32 x;
1041 int error = 0;
1042
1043 if (capable(CAP_SYS_RESOURCE) ||
1044 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1045 return 0;
1046
1047 error = gfs2_quota_hold(ip, uid, gid);
1048 if (error)
1049 return error;
1050
1051 sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1052 sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1053
1054 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1055 qd = ip->i_qadata->qa_qd[x];
1056 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1057 if (error)
1058 break;
1059 }
1060
1061 if (!error)
1062 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1063 else {
1064 while (x--)
1065 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1066 gfs2_quota_unhold(ip);
1067 }
1068
1069 return error;
1070 }
1071
need_sync(struct gfs2_quota_data * qd)1072 static int need_sync(struct gfs2_quota_data *qd)
1073 {
1074 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1075 struct gfs2_tune *gt = &sdp->sd_tune;
1076 s64 value;
1077 unsigned int num, den;
1078 int do_sync = 1;
1079
1080 if (!qd->qd_qb.qb_limit)
1081 return 0;
1082
1083 spin_lock(&qd_lock);
1084 value = qd->qd_change;
1085 spin_unlock(&qd_lock);
1086
1087 spin_lock(>->gt_spin);
1088 num = gt->gt_quota_scale_num;
1089 den = gt->gt_quota_scale_den;
1090 spin_unlock(>->gt_spin);
1091
1092 if (value < 0)
1093 do_sync = 0;
1094 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1095 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1096 do_sync = 0;
1097 else {
1098 value *= gfs2_jindex_size(sdp) * num;
1099 value = div_s64(value, den);
1100 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1101 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1102 do_sync = 0;
1103 }
1104
1105 return do_sync;
1106 }
1107
gfs2_quota_unlock(struct gfs2_inode * ip)1108 void gfs2_quota_unlock(struct gfs2_inode *ip)
1109 {
1110 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1111 struct gfs2_quota_data *qda[4];
1112 unsigned int count = 0;
1113 u32 x;
1114 int found;
1115
1116 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1117 goto out;
1118
1119 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1120 struct gfs2_quota_data *qd;
1121 int sync;
1122
1123 qd = ip->i_qadata->qa_qd[x];
1124 sync = need_sync(qd);
1125
1126 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1127 if (!sync)
1128 continue;
1129
1130 spin_lock(&qd_lock);
1131 found = qd_check_sync(sdp, qd, NULL);
1132 spin_unlock(&qd_lock);
1133
1134 if (!found)
1135 continue;
1136
1137 gfs2_assert_warn(sdp, qd->qd_change_sync);
1138 if (bh_get(qd)) {
1139 clear_bit(QDF_LOCKED, &qd->qd_flags);
1140 slot_put(qd);
1141 qd_put(qd);
1142 continue;
1143 }
1144
1145 qda[count++] = qd;
1146 }
1147
1148 if (count) {
1149 do_sync(count, qda);
1150 for (x = 0; x < count; x++)
1151 qd_unlock(qda[x]);
1152 }
1153
1154 out:
1155 gfs2_quota_unhold(ip);
1156 }
1157
1158 #define MAX_LINE 256
1159
print_message(struct gfs2_quota_data * qd,char * type)1160 static int print_message(struct gfs2_quota_data *qd, char *type)
1161 {
1162 struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1163
1164 fs_info(sdp, "quota %s for %s %u\n",
1165 type,
1166 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1167 from_kqid(&init_user_ns, qd->qd_id));
1168
1169 return 0;
1170 }
1171
1172 /**
1173 * gfs2_quota_check - check if allocating new blocks will exceed quota
1174 * @ip: The inode for which this check is being performed
1175 * @uid: The uid to check against
1176 * @gid: The gid to check against
1177 * @ap: The allocation parameters. ap->target contains the requested
1178 * blocks. ap->min_target, if set, contains the minimum blks
1179 * requested.
1180 *
1181 * Returns: 0 on success.
1182 * min_req = ap->min_target ? ap->min_target : ap->target;
1183 * quota must allow at least min_req blks for success and
1184 * ap->allowed is set to the number of blocks allowed
1185 *
1186 * -EDQUOT otherwise, quota violation. ap->allowed is set to number
1187 * of blocks available.
1188 */
gfs2_quota_check(struct gfs2_inode * ip,kuid_t uid,kgid_t gid,struct gfs2_alloc_parms * ap)1189 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1190 struct gfs2_alloc_parms *ap)
1191 {
1192 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1193 struct gfs2_quota_data *qd;
1194 s64 value, warn, limit;
1195 u32 x;
1196 int error = 0;
1197
1198 ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1199 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1200 return 0;
1201
1202 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1203 return 0;
1204
1205 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1206 qd = ip->i_qadata->qa_qd[x];
1207
1208 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1209 qid_eq(qd->qd_id, make_kqid_gid(gid))))
1210 continue;
1211
1212 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1213 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1214 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1215 spin_lock(&qd_lock);
1216 value += qd->qd_change;
1217 spin_unlock(&qd_lock);
1218
1219 if (limit > 0 && (limit - value) < ap->allowed)
1220 ap->allowed = limit - value;
1221 /* If we can't meet the target */
1222 if (limit && limit < (value + (s64)ap->target)) {
1223 /* If no min_target specified or we don't meet
1224 * min_target, return -EDQUOT */
1225 if (!ap->min_target || ap->min_target > ap->allowed) {
1226 if (!test_and_set_bit(QDF_QMSG_QUIET,
1227 &qd->qd_flags)) {
1228 print_message(qd, "exceeded");
1229 quota_send_warning(qd->qd_id,
1230 sdp->sd_vfs->s_dev,
1231 QUOTA_NL_BHARDWARN);
1232 }
1233 error = -EDQUOT;
1234 break;
1235 }
1236 } else if (warn && warn < value &&
1237 time_after_eq(jiffies, qd->qd_last_warn +
1238 gfs2_tune_get(sdp, gt_quota_warn_period)
1239 * HZ)) {
1240 quota_send_warning(qd->qd_id,
1241 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1242 error = print_message(qd, "warning");
1243 qd->qd_last_warn = jiffies;
1244 }
1245 }
1246 return error;
1247 }
1248
gfs2_quota_change(struct gfs2_inode * ip,s64 change,kuid_t uid,kgid_t gid)1249 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1250 kuid_t uid, kgid_t gid)
1251 {
1252 struct gfs2_quota_data *qd;
1253 u32 x;
1254 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1255
1256 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
1257 gfs2_assert_warn(sdp, change))
1258 return;
1259 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1260 return;
1261
1262 for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1263 qd = ip->i_qadata->qa_qd[x];
1264
1265 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1266 qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1267 do_qc(qd, change);
1268 }
1269 }
1270 }
1271
gfs2_quota_sync(struct super_block * sb,int type)1272 int gfs2_quota_sync(struct super_block *sb, int type)
1273 {
1274 struct gfs2_sbd *sdp = sb->s_fs_info;
1275 struct gfs2_quota_data **qda;
1276 unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1277 unsigned int num_qd;
1278 unsigned int x;
1279 int error = 0;
1280
1281 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1282 if (!qda)
1283 return -ENOMEM;
1284
1285 mutex_lock(&sdp->sd_quota_sync_mutex);
1286 sdp->sd_quota_sync_gen++;
1287
1288 do {
1289 num_qd = 0;
1290
1291 for (;;) {
1292 error = qd_fish(sdp, qda + num_qd);
1293 if (error || !qda[num_qd])
1294 break;
1295 if (++num_qd == max_qd)
1296 break;
1297 }
1298
1299 if (num_qd) {
1300 if (!error)
1301 error = do_sync(num_qd, qda);
1302 if (!error)
1303 for (x = 0; x < num_qd; x++)
1304 qda[x]->qd_sync_gen =
1305 sdp->sd_quota_sync_gen;
1306
1307 for (x = 0; x < num_qd; x++)
1308 qd_unlock(qda[x]);
1309 }
1310 } while (!error && num_qd == max_qd);
1311
1312 mutex_unlock(&sdp->sd_quota_sync_mutex);
1313 kfree(qda);
1314
1315 return error;
1316 }
1317
gfs2_quota_refresh(struct gfs2_sbd * sdp,struct kqid qid)1318 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1319 {
1320 struct gfs2_quota_data *qd;
1321 struct gfs2_holder q_gh;
1322 int error;
1323
1324 error = qd_get(sdp, qid, &qd);
1325 if (error)
1326 return error;
1327
1328 error = do_glock(qd, FORCE, &q_gh);
1329 if (!error)
1330 gfs2_glock_dq_uninit(&q_gh);
1331
1332 qd_put(qd);
1333 return error;
1334 }
1335
gfs2_quota_init(struct gfs2_sbd * sdp)1336 int gfs2_quota_init(struct gfs2_sbd *sdp)
1337 {
1338 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1339 u64 size = i_size_read(sdp->sd_qc_inode);
1340 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1341 unsigned int x, slot = 0;
1342 unsigned int found = 0;
1343 unsigned int hash;
1344 unsigned int bm_size;
1345 u64 dblock;
1346 u32 extlen = 0;
1347 int error;
1348
1349 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1350 return -EIO;
1351
1352 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1353 bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1354 bm_size *= sizeof(unsigned long);
1355 error = -ENOMEM;
1356 sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1357 if (sdp->sd_quota_bitmap == NULL)
1358 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1359 __GFP_ZERO, PAGE_KERNEL);
1360 if (!sdp->sd_quota_bitmap)
1361 return error;
1362
1363 for (x = 0; x < blocks; x++) {
1364 struct buffer_head *bh;
1365 const struct gfs2_quota_change *qc;
1366 unsigned int y;
1367
1368 if (!extlen) {
1369 int new = 0;
1370 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1371 if (error)
1372 goto fail;
1373 }
1374 error = -EIO;
1375 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1376 if (!bh)
1377 goto fail;
1378 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1379 brelse(bh);
1380 goto fail;
1381 }
1382
1383 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1384 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1385 y++, slot++) {
1386 struct gfs2_quota_data *qd;
1387 s64 qc_change = be64_to_cpu(qc->qc_change);
1388 u32 qc_flags = be32_to_cpu(qc->qc_flags);
1389 enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1390 USRQUOTA : GRPQUOTA;
1391 struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1392 be32_to_cpu(qc->qc_id));
1393 qc++;
1394 if (!qc_change)
1395 continue;
1396
1397 hash = gfs2_qd_hash(sdp, qc_id);
1398 qd = qd_alloc(hash, sdp, qc_id);
1399 if (qd == NULL) {
1400 brelse(bh);
1401 goto fail;
1402 }
1403
1404 set_bit(QDF_CHANGE, &qd->qd_flags);
1405 qd->qd_change = qc_change;
1406 qd->qd_slot = slot;
1407 qd->qd_slot_count = 1;
1408
1409 spin_lock(&qd_lock);
1410 BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1411 list_add(&qd->qd_list, &sdp->sd_quota_list);
1412 atomic_inc(&sdp->sd_quota_count);
1413 spin_unlock(&qd_lock);
1414
1415 spin_lock_bucket(hash);
1416 hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1417 spin_unlock_bucket(hash);
1418
1419 found++;
1420 }
1421
1422 brelse(bh);
1423 dblock++;
1424 extlen--;
1425 }
1426
1427 if (found)
1428 fs_info(sdp, "found %u quota changes\n", found);
1429
1430 return 0;
1431
1432 fail:
1433 gfs2_quota_cleanup(sdp);
1434 return error;
1435 }
1436
gfs2_quota_cleanup(struct gfs2_sbd * sdp)1437 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1438 {
1439 struct list_head *head = &sdp->sd_quota_list;
1440 struct gfs2_quota_data *qd;
1441
1442 spin_lock(&qd_lock);
1443 while (!list_empty(head)) {
1444 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1445
1446 list_del(&qd->qd_list);
1447
1448 /* Also remove if this qd exists in the reclaim list */
1449 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1450 atomic_dec(&sdp->sd_quota_count);
1451 spin_unlock(&qd_lock);
1452
1453 spin_lock_bucket(qd->qd_hash);
1454 hlist_bl_del_rcu(&qd->qd_hlist);
1455 spin_unlock_bucket(qd->qd_hash);
1456
1457 gfs2_assert_warn(sdp, !qd->qd_change);
1458 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1459 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1460
1461 gfs2_glock_put(qd->qd_gl);
1462 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1463
1464 spin_lock(&qd_lock);
1465 }
1466 spin_unlock(&qd_lock);
1467
1468 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1469
1470 kvfree(sdp->sd_quota_bitmap);
1471 sdp->sd_quota_bitmap = NULL;
1472 }
1473
quotad_error(struct gfs2_sbd * sdp,const char * msg,int error)1474 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1475 {
1476 if (error == 0 || error == -EROFS)
1477 return;
1478 if (!test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) {
1479 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1480 sdp->sd_log_error = error;
1481 wake_up(&sdp->sd_logd_waitq);
1482 }
1483 }
1484
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)1485 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1486 int (*fxn)(struct super_block *sb, int type),
1487 unsigned long t, unsigned long *timeo,
1488 unsigned int *new_timeo)
1489 {
1490 if (t >= *timeo) {
1491 int error = fxn(sdp->sd_vfs, 0);
1492 quotad_error(sdp, msg, error);
1493 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1494 } else {
1495 *timeo -= t;
1496 }
1497 }
1498
quotad_check_trunc_list(struct gfs2_sbd * sdp)1499 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1500 {
1501 struct gfs2_inode *ip;
1502
1503 while(1) {
1504 ip = NULL;
1505 spin_lock(&sdp->sd_trunc_lock);
1506 if (!list_empty(&sdp->sd_trunc_list)) {
1507 ip = list_entry(sdp->sd_trunc_list.next,
1508 struct gfs2_inode, i_trunc_list);
1509 list_del_init(&ip->i_trunc_list);
1510 }
1511 spin_unlock(&sdp->sd_trunc_lock);
1512 if (ip == NULL)
1513 return;
1514 gfs2_glock_finish_truncate(ip);
1515 }
1516 }
1517
gfs2_wake_up_statfs(struct gfs2_sbd * sdp)1518 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1519 if (!sdp->sd_statfs_force_sync) {
1520 sdp->sd_statfs_force_sync = 1;
1521 wake_up(&sdp->sd_quota_wait);
1522 }
1523 }
1524
1525
1526 /**
1527 * gfs2_quotad - Write cached quota changes into the quota file
1528 * @sdp: Pointer to GFS2 superblock
1529 *
1530 */
1531
gfs2_quotad(void * data)1532 int gfs2_quotad(void *data)
1533 {
1534 struct gfs2_sbd *sdp = data;
1535 struct gfs2_tune *tune = &sdp->sd_tune;
1536 unsigned long statfs_timeo = 0;
1537 unsigned long quotad_timeo = 0;
1538 unsigned long t = 0;
1539 DEFINE_WAIT(wait);
1540 int empty;
1541
1542 while (!kthread_should_stop()) {
1543
1544 /* Update the master statfs file */
1545 if (sdp->sd_statfs_force_sync) {
1546 int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1547 quotad_error(sdp, "statfs", error);
1548 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1549 }
1550 else
1551 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1552 &statfs_timeo,
1553 &tune->gt_statfs_quantum);
1554
1555 /* Update quota file */
1556 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1557 "ad_timeo, &tune->gt_quota_quantum);
1558
1559 /* Check for & recover partially truncated inodes */
1560 quotad_check_trunc_list(sdp);
1561
1562 try_to_freeze();
1563
1564 t = min(quotad_timeo, statfs_timeo);
1565
1566 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1567 spin_lock(&sdp->sd_trunc_lock);
1568 empty = list_empty(&sdp->sd_trunc_list);
1569 spin_unlock(&sdp->sd_trunc_lock);
1570 if (empty && !sdp->sd_statfs_force_sync)
1571 t -= schedule_timeout(t);
1572 else
1573 t = 0;
1574 finish_wait(&sdp->sd_quota_wait, &wait);
1575 }
1576
1577 return 0;
1578 }
1579
gfs2_quota_get_state(struct super_block * sb,struct qc_state * state)1580 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1581 {
1582 struct gfs2_sbd *sdp = sb->s_fs_info;
1583
1584 memset(state, 0, sizeof(*state));
1585
1586 switch (sdp->sd_args.ar_quota) {
1587 case GFS2_QUOTA_ON:
1588 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1589 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1590 /*FALLTHRU*/
1591 case GFS2_QUOTA_ACCOUNT:
1592 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1593 QCI_SYSFILE;
1594 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1595 QCI_SYSFILE;
1596 break;
1597 case GFS2_QUOTA_OFF:
1598 break;
1599 }
1600 if (sdp->sd_quota_inode) {
1601 state->s_state[USRQUOTA].ino =
1602 GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1603 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1604 }
1605 state->s_state[USRQUOTA].nextents = 1; /* unsupported */
1606 state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1607 state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1608 return 0;
1609 }
1610
gfs2_get_dqblk(struct super_block * sb,struct kqid qid,struct qc_dqblk * fdq)1611 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1612 struct qc_dqblk *fdq)
1613 {
1614 struct gfs2_sbd *sdp = sb->s_fs_info;
1615 struct gfs2_quota_lvb *qlvb;
1616 struct gfs2_quota_data *qd;
1617 struct gfs2_holder q_gh;
1618 int error;
1619
1620 memset(fdq, 0, sizeof(*fdq));
1621
1622 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1623 return -ESRCH; /* Crazy XFS error code */
1624
1625 if ((qid.type != USRQUOTA) &&
1626 (qid.type != GRPQUOTA))
1627 return -EINVAL;
1628
1629 error = qd_get(sdp, qid, &qd);
1630 if (error)
1631 return error;
1632 error = do_glock(qd, FORCE, &q_gh);
1633 if (error)
1634 goto out;
1635
1636 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1637 fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1638 fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1639 fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1640
1641 gfs2_glock_dq_uninit(&q_gh);
1642 out:
1643 qd_put(qd);
1644 return error;
1645 }
1646
1647 /* GFS2 only supports a subset of the XFS fields */
1648 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1649
gfs2_set_dqblk(struct super_block * sb,struct kqid qid,struct qc_dqblk * fdq)1650 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1651 struct qc_dqblk *fdq)
1652 {
1653 struct gfs2_sbd *sdp = sb->s_fs_info;
1654 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1655 struct gfs2_quota_data *qd;
1656 struct gfs2_holder q_gh, i_gh;
1657 unsigned int data_blocks, ind_blocks;
1658 unsigned int blocks = 0;
1659 int alloc_required;
1660 loff_t offset;
1661 int error;
1662
1663 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1664 return -ESRCH; /* Crazy XFS error code */
1665
1666 if ((qid.type != USRQUOTA) &&
1667 (qid.type != GRPQUOTA))
1668 return -EINVAL;
1669
1670 if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1671 return -EINVAL;
1672
1673 error = qd_get(sdp, qid, &qd);
1674 if (error)
1675 return error;
1676
1677 error = gfs2_rsqa_alloc(ip);
1678 if (error)
1679 goto out_put;
1680
1681 inode_lock(&ip->i_inode);
1682 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1683 if (error)
1684 goto out_unlockput;
1685 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1686 if (error)
1687 goto out_q;
1688
1689 /* Check for existing entry, if none then alloc new blocks */
1690 error = update_qd(sdp, qd);
1691 if (error)
1692 goto out_i;
1693
1694 /* If nothing has changed, this is a no-op */
1695 if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1696 ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1697 fdq->d_fieldmask ^= QC_SPC_SOFT;
1698
1699 if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1700 ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1701 fdq->d_fieldmask ^= QC_SPC_HARD;
1702
1703 if ((fdq->d_fieldmask & QC_SPACE) &&
1704 ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1705 fdq->d_fieldmask ^= QC_SPACE;
1706
1707 if (fdq->d_fieldmask == 0)
1708 goto out_i;
1709
1710 offset = qd2offset(qd);
1711 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1712 if (gfs2_is_stuffed(ip))
1713 alloc_required = 1;
1714 if (alloc_required) {
1715 struct gfs2_alloc_parms ap = { .aflags = 0, };
1716 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1717 &data_blocks, &ind_blocks);
1718 blocks = 1 + data_blocks + ind_blocks;
1719 ap.target = blocks;
1720 error = gfs2_inplace_reserve(ip, &ap);
1721 if (error)
1722 goto out_i;
1723 blocks += gfs2_rg_blocks(ip, blocks);
1724 }
1725
1726 /* Some quotas span block boundaries and can update two blocks,
1727 adding an extra block to the transaction to handle such quotas */
1728 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1729 if (error)
1730 goto out_release;
1731
1732 /* Apply changes */
1733 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1734 if (!error)
1735 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1736
1737 gfs2_trans_end(sdp);
1738 out_release:
1739 if (alloc_required)
1740 gfs2_inplace_release(ip);
1741 out_i:
1742 gfs2_glock_dq_uninit(&i_gh);
1743 out_q:
1744 gfs2_glock_dq_uninit(&q_gh);
1745 out_unlockput:
1746 inode_unlock(&ip->i_inode);
1747 out_put:
1748 qd_put(qd);
1749 return error;
1750 }
1751
1752 const struct quotactl_ops gfs2_quotactl_ops = {
1753 .quota_sync = gfs2_quota_sync,
1754 .get_state = gfs2_quota_get_state,
1755 .get_dqblk = gfs2_get_dqblk,
1756 .set_dqblk = gfs2_set_dqblk,
1757 };
1758
gfs2_quota_hash_init(void)1759 void __init gfs2_quota_hash_init(void)
1760 {
1761 unsigned i;
1762
1763 for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1764 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1765 }
1766