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TOMOYO Linux Cross Reference
Linux/fs/gfs2/quota.c

Version: ~ [ linux-5.16 ] ~ [ linux-5.15.13 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.90 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.170 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.224 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.261 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.296 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.298 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  3  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
  4  *
  5  * This copyrighted material is made available to anyone wishing to use,
  6  * modify, copy, or redistribute it subject to the terms and conditions
  7  * of the GNU General Public License version 2.
  8  */
  9 
 10 /*
 11  * Quota change tags are associated with each transaction that allocates or
 12  * deallocates space.  Those changes are accumulated locally to each node (in a
 13  * per-node file) and then are periodically synced to the quota file.  This
 14  * avoids the bottleneck of constantly touching the quota file, but introduces
 15  * fuzziness in the current usage value of IDs that are being used on different
 16  * nodes in the cluster simultaneously.  So, it is possible for a user on
 17  * multiple nodes to overrun their quota, but that overrun is controlable.
 18  * Since quota tags are part of transactions, there is no need for a quota check
 19  * program to be run on node crashes or anything like that.
 20  *
 21  * There are couple of knobs that let the administrator manage the quota
 22  * fuzziness.  "quota_quantum" sets the maximum time a quota change can be
 23  * sitting on one node before being synced to the quota file.  (The default is
 24  * 60 seconds.)  Another knob, "quota_scale" controls how quickly the frequency
 25  * of quota file syncs increases as the user moves closer to their limit.  The
 26  * more frequent the syncs, the more accurate the quota enforcement, but that
 27  * means that there is more contention between the nodes for the quota file.
 28  * The default value is one.  This sets the maximum theoretical quota overrun
 29  * (with infinite node with infinite bandwidth) to twice the user's limit.  (In
 30  * practice, the maximum overrun you see should be much less.)  A "quota_scale"
 31  * number greater than one makes quota syncs more frequent and reduces the
 32  * maximum overrun.  Numbers less than one (but greater than zero) make quota
 33  * syncs less frequent.
 34  *
 35  * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
 36  * the quota file, so it is not being constantly read.
 37  */
 38 
 39 #include <linux/sched.h>
 40 #include <linux/slab.h>
 41 #include <linux/mm.h>
 42 #include <linux/spinlock.h>
 43 #include <linux/completion.h>
 44 #include <linux/buffer_head.h>
 45 #include <linux/sort.h>
 46 #include <linux/fs.h>
 47 #include <linux/bio.h>
 48 #include <linux/gfs2_ondisk.h>
 49 #include <linux/kthread.h>
 50 #include <linux/freezer.h>
 51 #include <linux/quota.h>
 52 #include <linux/dqblk_xfs.h>
 53 
 54 #include "gfs2.h"
 55 #include "incore.h"
 56 #include "bmap.h"
 57 #include "glock.h"
 58 #include "glops.h"
 59 #include "log.h"
 60 #include "meta_io.h"
 61 #include "quota.h"
 62 #include "rgrp.h"
 63 #include "super.h"
 64 #include "trans.h"
 65 #include "inode.h"
 66 #include "util.h"
 67 
 68 struct gfs2_quota_change_host {
 69         u64 qc_change;
 70         u32 qc_flags; /* GFS2_QCF_... */
 71         struct kqid qc_id;
 72 };
 73 
 74 static LIST_HEAD(qd_lru_list);
 75 static atomic_t qd_lru_count = ATOMIC_INIT(0);
 76 static DEFINE_SPINLOCK(qd_lru_lock);
 77 
 78 unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
 79                                   struct shrink_control *sc)
 80 {
 81         struct gfs2_quota_data *qd;
 82         struct gfs2_sbd *sdp;
 83         int nr_to_scan = sc->nr_to_scan;
 84         long freed = 0;
 85 
 86         if (!(sc->gfp_mask & __GFP_FS))
 87                 return SHRINK_STOP;
 88 
 89         spin_lock(&qd_lru_lock);
 90         while (nr_to_scan && !list_empty(&qd_lru_list)) {
 91                 qd = list_entry(qd_lru_list.next,
 92                                 struct gfs2_quota_data, qd_reclaim);
 93                 sdp = qd->qd_gl->gl_sbd;
 94 
 95                 /* Free from the filesystem-specific list */
 96                 list_del(&qd->qd_list);
 97 
 98                 gfs2_assert_warn(sdp, !qd->qd_change);
 99                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
100                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
101 
102                 gfs2_glock_put(qd->qd_gl);
103                 atomic_dec(&sdp->sd_quota_count);
104 
105                 /* Delete it from the common reclaim list */
106                 list_del_init(&qd->qd_reclaim);
107                 atomic_dec(&qd_lru_count);
108                 spin_unlock(&qd_lru_lock);
109                 kmem_cache_free(gfs2_quotad_cachep, qd);
110                 spin_lock(&qd_lru_lock);
111                 nr_to_scan--;
112                 freed++;
113         }
114         spin_unlock(&qd_lru_lock);
115         return freed;
116 }
117 
118 unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
119                                    struct shrink_control *sc)
120 {
121         return vfs_pressure_ratio(atomic_read(&qd_lru_count));
122 }
123 
124 static u64 qd2index(struct gfs2_quota_data *qd)
125 {
126         struct kqid qid = qd->qd_id;
127         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
128                 ((qid.type == USRQUOTA) ? 0 : 1);
129 }
130 
131 static u64 qd2offset(struct gfs2_quota_data *qd)
132 {
133         u64 offset;
134 
135         offset = qd2index(qd);
136         offset *= sizeof(struct gfs2_quota);
137 
138         return offset;
139 }
140 
141 static int qd_alloc(struct gfs2_sbd *sdp, struct kqid qid,
142                     struct gfs2_quota_data **qdp)
143 {
144         struct gfs2_quota_data *qd;
145         int error;
146 
147         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
148         if (!qd)
149                 return -ENOMEM;
150 
151         atomic_set(&qd->qd_count, 1);
152         qd->qd_id = qid;
153         qd->qd_slot = -1;
154         INIT_LIST_HEAD(&qd->qd_reclaim);
155 
156         error = gfs2_glock_get(sdp, qd2index(qd),
157                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
158         if (error)
159                 goto fail;
160 
161         *qdp = qd;
162 
163         return 0;
164 
165 fail:
166         kmem_cache_free(gfs2_quotad_cachep, qd);
167         return error;
168 }
169 
170 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
171                   struct gfs2_quota_data **qdp)
172 {
173         struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
174         int error, found;
175 
176         *qdp = NULL;
177 
178         for (;;) {
179                 found = 0;
180                 spin_lock(&qd_lru_lock);
181                 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
182                         if (qid_eq(qd->qd_id, qid)) {
183                                 if (!atomic_read(&qd->qd_count) &&
184                                     !list_empty(&qd->qd_reclaim)) {
185                                         /* Remove it from reclaim list */
186                                         list_del_init(&qd->qd_reclaim);
187                                         atomic_dec(&qd_lru_count);
188                                 }
189                                 atomic_inc(&qd->qd_count);
190                                 found = 1;
191                                 break;
192                         }
193                 }
194 
195                 if (!found)
196                         qd = NULL;
197 
198                 if (!qd && new_qd) {
199                         qd = new_qd;
200                         list_add(&qd->qd_list, &sdp->sd_quota_list);
201                         atomic_inc(&sdp->sd_quota_count);
202                         new_qd = NULL;
203                 }
204 
205                 spin_unlock(&qd_lru_lock);
206 
207                 if (qd) {
208                         if (new_qd) {
209                                 gfs2_glock_put(new_qd->qd_gl);
210                                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
211                         }
212                         *qdp = qd;
213                         return 0;
214                 }
215 
216                 error = qd_alloc(sdp, qid, &new_qd);
217                 if (error)
218                         return error;
219         }
220 }
221 
222 static void qd_hold(struct gfs2_quota_data *qd)
223 {
224         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
225         gfs2_assert(sdp, atomic_read(&qd->qd_count));
226         atomic_inc(&qd->qd_count);
227 }
228 
229 static void qd_put(struct gfs2_quota_data *qd)
230 {
231         if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) {
232                 /* Add to the reclaim list */
233                 list_add_tail(&qd->qd_reclaim, &qd_lru_list);
234                 atomic_inc(&qd_lru_count);
235                 spin_unlock(&qd_lru_lock);
236         }
237 }
238 
239 static int slot_get(struct gfs2_quota_data *qd)
240 {
241         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
242         unsigned int c, o = 0, b;
243         unsigned char byte = 0;
244 
245         spin_lock(&qd_lru_lock);
246 
247         if (qd->qd_slot_count++) {
248                 spin_unlock(&qd_lru_lock);
249                 return 0;
250         }
251 
252         for (c = 0; c < sdp->sd_quota_chunks; c++)
253                 for (o = 0; o < PAGE_SIZE; o++) {
254                         byte = sdp->sd_quota_bitmap[c][o];
255                         if (byte != 0xFF)
256                                 goto found;
257                 }
258 
259         goto fail;
260 
261 found:
262         for (b = 0; b < 8; b++)
263                 if (!(byte & (1 << b)))
264                         break;
265         qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
266 
267         if (qd->qd_slot >= sdp->sd_quota_slots)
268                 goto fail;
269 
270         sdp->sd_quota_bitmap[c][o] |= 1 << b;
271 
272         spin_unlock(&qd_lru_lock);
273 
274         return 0;
275 
276 fail:
277         qd->qd_slot_count--;
278         spin_unlock(&qd_lru_lock);
279         return -ENOSPC;
280 }
281 
282 static void slot_hold(struct gfs2_quota_data *qd)
283 {
284         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
285 
286         spin_lock(&qd_lru_lock);
287         gfs2_assert(sdp, qd->qd_slot_count);
288         qd->qd_slot_count++;
289         spin_unlock(&qd_lru_lock);
290 }
291 
292 static void slot_put(struct gfs2_quota_data *qd)
293 {
294         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
295 
296         spin_lock(&qd_lru_lock);
297         gfs2_assert(sdp, qd->qd_slot_count);
298         if (!--qd->qd_slot_count) {
299                 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
300                 qd->qd_slot = -1;
301         }
302         spin_unlock(&qd_lru_lock);
303 }
304 
305 static int bh_get(struct gfs2_quota_data *qd)
306 {
307         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
308         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
309         unsigned int block, offset;
310         struct buffer_head *bh;
311         int error;
312         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
313 
314         mutex_lock(&sdp->sd_quota_mutex);
315 
316         if (qd->qd_bh_count++) {
317                 mutex_unlock(&sdp->sd_quota_mutex);
318                 return 0;
319         }
320 
321         block = qd->qd_slot / sdp->sd_qc_per_block;
322         offset = qd->qd_slot % sdp->sd_qc_per_block;
323 
324         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
325         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
326         if (error)
327                 goto fail;
328         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
329         if (error)
330                 goto fail;
331         error = -EIO;
332         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
333                 goto fail_brelse;
334 
335         qd->qd_bh = bh;
336         qd->qd_bh_qc = (struct gfs2_quota_change *)
337                 (bh->b_data + sizeof(struct gfs2_meta_header) +
338                  offset * sizeof(struct gfs2_quota_change));
339 
340         mutex_unlock(&sdp->sd_quota_mutex);
341 
342         return 0;
343 
344 fail_brelse:
345         brelse(bh);
346 fail:
347         qd->qd_bh_count--;
348         mutex_unlock(&sdp->sd_quota_mutex);
349         return error;
350 }
351 
352 static void bh_put(struct gfs2_quota_data *qd)
353 {
354         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
355 
356         mutex_lock(&sdp->sd_quota_mutex);
357         gfs2_assert(sdp, qd->qd_bh_count);
358         if (!--qd->qd_bh_count) {
359                 brelse(qd->qd_bh);
360                 qd->qd_bh = NULL;
361                 qd->qd_bh_qc = NULL;
362         }
363         mutex_unlock(&sdp->sd_quota_mutex);
364 }
365 
366 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
367 {
368         struct gfs2_quota_data *qd = NULL;
369         int error;
370         int found = 0;
371 
372         *qdp = NULL;
373 
374         if (sdp->sd_vfs->s_flags & MS_RDONLY)
375                 return 0;
376 
377         spin_lock(&qd_lru_lock);
378 
379         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
380                 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
381                     !test_bit(QDF_CHANGE, &qd->qd_flags) ||
382                     qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
383                         continue;
384 
385                 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
386 
387                 set_bit(QDF_LOCKED, &qd->qd_flags);
388                 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
389                 atomic_inc(&qd->qd_count);
390                 qd->qd_change_sync = qd->qd_change;
391                 gfs2_assert_warn(sdp, qd->qd_slot_count);
392                 qd->qd_slot_count++;
393                 found = 1;
394 
395                 break;
396         }
397 
398         if (!found)
399                 qd = NULL;
400 
401         spin_unlock(&qd_lru_lock);
402 
403         if (qd) {
404                 gfs2_assert_warn(sdp, qd->qd_change_sync);
405                 error = bh_get(qd);
406                 if (error) {
407                         clear_bit(QDF_LOCKED, &qd->qd_flags);
408                         slot_put(qd);
409                         qd_put(qd);
410                         return error;
411                 }
412         }
413 
414         *qdp = qd;
415 
416         return 0;
417 }
418 
419 static int qd_trylock(struct gfs2_quota_data *qd)
420 {
421         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
422 
423         if (sdp->sd_vfs->s_flags & MS_RDONLY)
424                 return 0;
425 
426         spin_lock(&qd_lru_lock);
427 
428         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
429             !test_bit(QDF_CHANGE, &qd->qd_flags)) {
430                 spin_unlock(&qd_lru_lock);
431                 return 0;
432         }
433 
434         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
435 
436         set_bit(QDF_LOCKED, &qd->qd_flags);
437         gfs2_assert_warn(sdp, atomic_read(&qd->qd_count));
438         atomic_inc(&qd->qd_count);
439         qd->qd_change_sync = qd->qd_change;
440         gfs2_assert_warn(sdp, qd->qd_slot_count);
441         qd->qd_slot_count++;
442 
443         spin_unlock(&qd_lru_lock);
444 
445         gfs2_assert_warn(sdp, qd->qd_change_sync);
446         if (bh_get(qd)) {
447                 clear_bit(QDF_LOCKED, &qd->qd_flags);
448                 slot_put(qd);
449                 qd_put(qd);
450                 return 0;
451         }
452 
453         return 1;
454 }
455 
456 static void qd_unlock(struct gfs2_quota_data *qd)
457 {
458         gfs2_assert_warn(qd->qd_gl->gl_sbd,
459                          test_bit(QDF_LOCKED, &qd->qd_flags));
460         clear_bit(QDF_LOCKED, &qd->qd_flags);
461         bh_put(qd);
462         slot_put(qd);
463         qd_put(qd);
464 }
465 
466 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
467                     struct gfs2_quota_data **qdp)
468 {
469         int error;
470 
471         error = qd_get(sdp, qid, qdp);
472         if (error)
473                 return error;
474 
475         error = slot_get(*qdp);
476         if (error)
477                 goto fail;
478 
479         error = bh_get(*qdp);
480         if (error)
481                 goto fail_slot;
482 
483         return 0;
484 
485 fail_slot:
486         slot_put(*qdp);
487 fail:
488         qd_put(*qdp);
489         return error;
490 }
491 
492 static void qdsb_put(struct gfs2_quota_data *qd)
493 {
494         bh_put(qd);
495         slot_put(qd);
496         qd_put(qd);
497 }
498 
499 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
500 {
501         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
502         struct gfs2_quota_data **qd;
503         int error;
504 
505         if (ip->i_res == NULL) {
506                 error = gfs2_rs_alloc(ip);
507                 if (error)
508                         return error;
509         }
510 
511         qd = ip->i_res->rs_qa_qd;
512 
513         if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) ||
514             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
515                 return -EIO;
516 
517         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
518                 return 0;
519 
520         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
521         if (error)
522                 goto out;
523         ip->i_res->rs_qa_qd_num++;
524         qd++;
525 
526         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
527         if (error)
528                 goto out;
529         ip->i_res->rs_qa_qd_num++;
530         qd++;
531 
532         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
533             !uid_eq(uid, ip->i_inode.i_uid)) {
534                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
535                 if (error)
536                         goto out;
537                 ip->i_res->rs_qa_qd_num++;
538                 qd++;
539         }
540 
541         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
542             !gid_eq(gid, ip->i_inode.i_gid)) {
543                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
544                 if (error)
545                         goto out;
546                 ip->i_res->rs_qa_qd_num++;
547                 qd++;
548         }
549 
550 out:
551         if (error)
552                 gfs2_quota_unhold(ip);
553         return error;
554 }
555 
556 void gfs2_quota_unhold(struct gfs2_inode *ip)
557 {
558         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
559         unsigned int x;
560 
561         if (ip->i_res == NULL)
562                 return;
563         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
564 
565         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
566                 qdsb_put(ip->i_res->rs_qa_qd[x]);
567                 ip->i_res->rs_qa_qd[x] = NULL;
568         }
569         ip->i_res->rs_qa_qd_num = 0;
570 }
571 
572 static int sort_qd(const void *a, const void *b)
573 {
574         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
575         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
576 
577         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
578                 return -1;
579         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
580                 return 1;
581         return 0;
582 }
583 
584 static void do_qc(struct gfs2_quota_data *qd, s64 change)
585 {
586         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
587         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
588         struct gfs2_quota_change *qc = qd->qd_bh_qc;
589         s64 x;
590 
591         mutex_lock(&sdp->sd_quota_mutex);
592         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
593 
594         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
595                 qc->qc_change = 0;
596                 qc->qc_flags = 0;
597                 if (qd->qd_id.type == USRQUOTA)
598                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
599                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
600         }
601 
602         x = be64_to_cpu(qc->qc_change) + change;
603         qc->qc_change = cpu_to_be64(x);
604 
605         spin_lock(&qd_lru_lock);
606         qd->qd_change = x;
607         spin_unlock(&qd_lru_lock);
608 
609         if (!x) {
610                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
611                 clear_bit(QDF_CHANGE, &qd->qd_flags);
612                 qc->qc_flags = 0;
613                 qc->qc_id = 0;
614                 slot_put(qd);
615                 qd_put(qd);
616         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
617                 qd_hold(qd);
618                 slot_hold(qd);
619         }
620 
621         mutex_unlock(&sdp->sd_quota_mutex);
622 }
623 
624 /**
625  * gfs2_adjust_quota - adjust record of current block usage
626  * @ip: The quota inode
627  * @loc: Offset of the entry in the quota file
628  * @change: The amount of usage change to record
629  * @qd: The quota data
630  * @fdq: The updated limits to record
631  *
632  * This function was mostly borrowed from gfs2_block_truncate_page which was
633  * in turn mostly borrowed from ext3
634  *
635  * Returns: 0 or -ve on error
636  */
637 
638 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
639                              s64 change, struct gfs2_quota_data *qd,
640                              struct fs_disk_quota *fdq)
641 {
642         struct inode *inode = &ip->i_inode;
643         struct gfs2_sbd *sdp = GFS2_SB(inode);
644         struct address_space *mapping = inode->i_mapping;
645         unsigned long index = loc >> PAGE_CACHE_SHIFT;
646         unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
647         unsigned blocksize, iblock, pos;
648         struct buffer_head *bh;
649         struct page *page;
650         void *kaddr, *ptr;
651         struct gfs2_quota q, *qp;
652         int err, nbytes;
653         u64 size;
654 
655         if (gfs2_is_stuffed(ip)) {
656                 err = gfs2_unstuff_dinode(ip, NULL);
657                 if (err)
658                         return err;
659         }
660 
661         memset(&q, 0, sizeof(struct gfs2_quota));
662         err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q));
663         if (err < 0)
664                 return err;
665 
666         err = -EIO;
667         qp = &q;
668         qp->qu_value = be64_to_cpu(qp->qu_value);
669         qp->qu_value += change;
670         qp->qu_value = cpu_to_be64(qp->qu_value);
671         qd->qd_qb.qb_value = qp->qu_value;
672         if (fdq) {
673                 if (fdq->d_fieldmask & FS_DQ_BSOFT) {
674                         qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift);
675                         qd->qd_qb.qb_warn = qp->qu_warn;
676                 }
677                 if (fdq->d_fieldmask & FS_DQ_BHARD) {
678                         qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift);
679                         qd->qd_qb.qb_limit = qp->qu_limit;
680                 }
681                 if (fdq->d_fieldmask & FS_DQ_BCOUNT) {
682                         qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift);
683                         qd->qd_qb.qb_value = qp->qu_value;
684                 }
685         }
686 
687         /* Write the quota into the quota file on disk */
688         ptr = qp;
689         nbytes = sizeof(struct gfs2_quota);
690 get_a_page:
691         page = find_or_create_page(mapping, index, GFP_NOFS);
692         if (!page)
693                 return -ENOMEM;
694 
695         blocksize = inode->i_sb->s_blocksize;
696         iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
697 
698         if (!page_has_buffers(page))
699                 create_empty_buffers(page, blocksize, 0);
700 
701         bh = page_buffers(page);
702         pos = blocksize;
703         while (offset >= pos) {
704                 bh = bh->b_this_page;
705                 iblock++;
706                 pos += blocksize;
707         }
708 
709         if (!buffer_mapped(bh)) {
710                 gfs2_block_map(inode, iblock, bh, 1);
711                 if (!buffer_mapped(bh))
712                         goto unlock_out;
713                 /* If it's a newly allocated disk block for quota, zero it */
714                 if (buffer_new(bh))
715                         zero_user(page, pos - blocksize, bh->b_size);
716         }
717 
718         if (PageUptodate(page))
719                 set_buffer_uptodate(bh);
720 
721         if (!buffer_uptodate(bh)) {
722                 ll_rw_block(READ | REQ_META, 1, &bh);
723                 wait_on_buffer(bh);
724                 if (!buffer_uptodate(bh))
725                         goto unlock_out;
726         }
727 
728         gfs2_trans_add_data(ip->i_gl, bh);
729 
730         kaddr = kmap_atomic(page);
731         if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE)
732                 nbytes = PAGE_CACHE_SIZE - offset;
733         memcpy(kaddr + offset, ptr, nbytes);
734         flush_dcache_page(page);
735         kunmap_atomic(kaddr);
736         unlock_page(page);
737         page_cache_release(page);
738 
739         /* If quota straddles page boundary, we need to update the rest of the
740          * quota at the beginning of the next page */
741         if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) {
742                 ptr = ptr + nbytes;
743                 nbytes = sizeof(struct gfs2_quota) - nbytes;
744                 offset = 0;
745                 index++;
746                 goto get_a_page;
747         }
748 
749         size = loc + sizeof(struct gfs2_quota);
750         if (size > inode->i_size)
751                 i_size_write(inode, size);
752         inode->i_mtime = inode->i_atime = CURRENT_TIME;
753         mark_inode_dirty(inode);
754         return 0;
755 
756 unlock_out:
757         unlock_page(page);
758         page_cache_release(page);
759         return err;
760 }
761 
762 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
763 {
764         struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
765         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
766         unsigned int data_blocks, ind_blocks;
767         struct gfs2_holder *ghs, i_gh;
768         unsigned int qx, x;
769         struct gfs2_quota_data *qd;
770         unsigned reserved;
771         loff_t offset;
772         unsigned int nalloc = 0, blocks;
773         int error;
774 
775         error = gfs2_rs_alloc(ip);
776         if (error)
777                 return error;
778 
779         gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
780                               &data_blocks, &ind_blocks);
781 
782         ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
783         if (!ghs)
784                 return -ENOMEM;
785 
786         sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
787         mutex_lock(&ip->i_inode.i_mutex);
788         for (qx = 0; qx < num_qd; qx++) {
789                 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE,
790                                            GL_NOCACHE, &ghs[qx]);
791                 if (error)
792                         goto out;
793         }
794 
795         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
796         if (error)
797                 goto out;
798 
799         for (x = 0; x < num_qd; x++) {
800                 offset = qd2offset(qda[x]);
801                 if (gfs2_write_alloc_required(ip, offset,
802                                               sizeof(struct gfs2_quota)))
803                         nalloc++;
804         }
805 
806         /* 
807          * 1 blk for unstuffing inode if stuffed. We add this extra
808          * block to the reservation unconditionally. If the inode
809          * doesn't need unstuffing, the block will be released to the 
810          * rgrp since it won't be allocated during the transaction
811          */
812         /* +3 in the end for unstuffing block, inode size update block
813          * and another block in case quota straddles page boundary and 
814          * two blocks need to be updated instead of 1 */
815         blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3;
816 
817         reserved = 1 + (nalloc * (data_blocks + ind_blocks));
818         error = gfs2_inplace_reserve(ip, reserved, 0);
819         if (error)
820                 goto out_alloc;
821 
822         if (nalloc)
823                 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS;
824 
825         error = gfs2_trans_begin(sdp, blocks, 0);
826         if (error)
827                 goto out_ipres;
828 
829         for (x = 0; x < num_qd; x++) {
830                 qd = qda[x];
831                 offset = qd2offset(qd);
832                 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL);
833                 if (error)
834                         goto out_end_trans;
835 
836                 do_qc(qd, -qd->qd_change_sync);
837                 set_bit(QDF_REFRESH, &qd->qd_flags);
838         }
839 
840         error = 0;
841 
842 out_end_trans:
843         gfs2_trans_end(sdp);
844 out_ipres:
845         gfs2_inplace_release(ip);
846 out_alloc:
847         gfs2_glock_dq_uninit(&i_gh);
848 out:
849         while (qx--)
850                 gfs2_glock_dq_uninit(&ghs[qx]);
851         mutex_unlock(&ip->i_inode.i_mutex);
852         kfree(ghs);
853         gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
854         return error;
855 }
856 
857 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
858 {
859         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
860         struct gfs2_quota q;
861         struct gfs2_quota_lvb *qlvb;
862         loff_t pos;
863         int error;
864 
865         memset(&q, 0, sizeof(struct gfs2_quota));
866         pos = qd2offset(qd);
867         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
868         if (error < 0)
869                 return error;
870 
871         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
872         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
873         qlvb->__pad = 0;
874         qlvb->qb_limit = q.qu_limit;
875         qlvb->qb_warn = q.qu_warn;
876         qlvb->qb_value = q.qu_value;
877         qd->qd_qb = *qlvb;
878 
879         return 0;
880 }
881 
882 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
883                     struct gfs2_holder *q_gh)
884 {
885         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
886         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
887         struct gfs2_holder i_gh;
888         int error;
889 
890 restart:
891         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
892         if (error)
893                 return error;
894 
895         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
896 
897         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
898                 gfs2_glock_dq_uninit(q_gh);
899                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
900                                            GL_NOCACHE, q_gh);
901                 if (error)
902                         return error;
903 
904                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
905                 if (error)
906                         goto fail;
907 
908                 error = update_qd(sdp, qd);
909                 if (error)
910                         goto fail_gunlock;
911 
912                 gfs2_glock_dq_uninit(&i_gh);
913                 gfs2_glock_dq_uninit(q_gh);
914                 force_refresh = 0;
915                 goto restart;
916         }
917 
918         return 0;
919 
920 fail_gunlock:
921         gfs2_glock_dq_uninit(&i_gh);
922 fail:
923         gfs2_glock_dq_uninit(q_gh);
924         return error;
925 }
926 
927 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
928 {
929         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
930         struct gfs2_quota_data *qd;
931         unsigned int x;
932         int error = 0;
933 
934         error = gfs2_quota_hold(ip, uid, gid);
935         if (error)
936                 return error;
937 
938         if (capable(CAP_SYS_RESOURCE) ||
939             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
940                 return 0;
941 
942         sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num,
943              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
944 
945         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
946                 int force = NO_FORCE;
947                 qd = ip->i_res->rs_qa_qd[x];
948                 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
949                         force = FORCE;
950                 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]);
951                 if (error)
952                         break;
953         }
954 
955         if (!error)
956                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
957         else {
958                 while (x--)
959                         gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
960                 gfs2_quota_unhold(ip);
961         }
962 
963         return error;
964 }
965 
966 static int need_sync(struct gfs2_quota_data *qd)
967 {
968         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
969         struct gfs2_tune *gt = &sdp->sd_tune;
970         s64 value;
971         unsigned int num, den;
972         int do_sync = 1;
973 
974         if (!qd->qd_qb.qb_limit)
975                 return 0;
976 
977         spin_lock(&qd_lru_lock);
978         value = qd->qd_change;
979         spin_unlock(&qd_lru_lock);
980 
981         spin_lock(&gt->gt_spin);
982         num = gt->gt_quota_scale_num;
983         den = gt->gt_quota_scale_den;
984         spin_unlock(&gt->gt_spin);
985 
986         if (value < 0)
987                 do_sync = 0;
988         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
989                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
990                 do_sync = 0;
991         else {
992                 value *= gfs2_jindex_size(sdp) * num;
993                 value = div_s64(value, den);
994                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
995                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
996                         do_sync = 0;
997         }
998 
999         return do_sync;
1000 }
1001 
1002 void gfs2_quota_unlock(struct gfs2_inode *ip)
1003 {
1004         struct gfs2_quota_data *qda[4];
1005         unsigned int count = 0;
1006         unsigned int x;
1007 
1008         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1009                 goto out;
1010 
1011         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1012                 struct gfs2_quota_data *qd;
1013                 int sync;
1014 
1015                 qd = ip->i_res->rs_qa_qd[x];
1016                 sync = need_sync(qd);
1017 
1018                 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]);
1019 
1020                 if (sync && qd_trylock(qd))
1021                         qda[count++] = qd;
1022         }
1023 
1024         if (count) {
1025                 do_sync(count, qda);
1026                 for (x = 0; x < count; x++)
1027                         qd_unlock(qda[x]);
1028         }
1029 
1030 out:
1031         gfs2_quota_unhold(ip);
1032 }
1033 
1034 #define MAX_LINE 256
1035 
1036 static int print_message(struct gfs2_quota_data *qd, char *type)
1037 {
1038         struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
1039 
1040         printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n",
1041                sdp->sd_fsname, type,
1042                (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1043                from_kqid(&init_user_ns, qd->qd_id));
1044 
1045         return 0;
1046 }
1047 
1048 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1049 {
1050         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1051         struct gfs2_quota_data *qd;
1052         s64 value;
1053         unsigned int x;
1054         int error = 0;
1055 
1056         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1057                 return 0;
1058 
1059         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1060                 return 0;
1061 
1062         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1063                 qd = ip->i_res->rs_qa_qd[x];
1064 
1065                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1066                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1067                         continue;
1068 
1069                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1070                 spin_lock(&qd_lru_lock);
1071                 value += qd->qd_change;
1072                 spin_unlock(&qd_lru_lock);
1073 
1074                 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
1075                         print_message(qd, "exceeded");
1076                         quota_send_warning(qd->qd_id,
1077                                            sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN);
1078 
1079                         error = -EDQUOT;
1080                         break;
1081                 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
1082                            (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
1083                            time_after_eq(jiffies, qd->qd_last_warn +
1084                                          gfs2_tune_get(sdp,
1085                                                 gt_quota_warn_period) * HZ)) {
1086                         quota_send_warning(qd->qd_id,
1087                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1088                         error = print_message(qd, "warning");
1089                         qd->qd_last_warn = jiffies;
1090                 }
1091         }
1092 
1093         return error;
1094 }
1095 
1096 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1097                        kuid_t uid, kgid_t gid)
1098 {
1099         struct gfs2_quota_data *qd;
1100         unsigned int x;
1101 
1102         if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1103                 return;
1104         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1105                 return;
1106 
1107         for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) {
1108                 qd = ip->i_res->rs_qa_qd[x];
1109 
1110                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1111                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1112                         do_qc(qd, change);
1113                 }
1114         }
1115 }
1116 
1117 int gfs2_quota_sync(struct super_block *sb, int type)
1118 {
1119         struct gfs2_sbd *sdp = sb->s_fs_info;
1120         struct gfs2_quota_data **qda;
1121         unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1122         unsigned int num_qd;
1123         unsigned int x;
1124         int error = 0;
1125 
1126         sdp->sd_quota_sync_gen++;
1127 
1128         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1129         if (!qda)
1130                 return -ENOMEM;
1131 
1132         do {
1133                 num_qd = 0;
1134 
1135                 for (;;) {
1136                         error = qd_fish(sdp, qda + num_qd);
1137                         if (error || !qda[num_qd])
1138                                 break;
1139                         if (++num_qd == max_qd)
1140                                 break;
1141                 }
1142 
1143                 if (num_qd) {
1144                         if (!error)
1145                                 error = do_sync(num_qd, qda);
1146                         if (!error)
1147                                 for (x = 0; x < num_qd; x++)
1148                                         qda[x]->qd_sync_gen =
1149                                                 sdp->sd_quota_sync_gen;
1150 
1151                         for (x = 0; x < num_qd; x++)
1152                                 qd_unlock(qda[x]);
1153                 }
1154         } while (!error && num_qd == max_qd);
1155 
1156         kfree(qda);
1157 
1158         return error;
1159 }
1160 
1161 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1162 {
1163         struct gfs2_quota_data *qd;
1164         struct gfs2_holder q_gh;
1165         int error;
1166 
1167         error = qd_get(sdp, qid, &qd);
1168         if (error)
1169                 return error;
1170 
1171         error = do_glock(qd, FORCE, &q_gh);
1172         if (!error)
1173                 gfs2_glock_dq_uninit(&q_gh);
1174 
1175         qd_put(qd);
1176         return error;
1177 }
1178 
1179 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1180 {
1181         const struct gfs2_quota_change *str = buf;
1182 
1183         qc->qc_change = be64_to_cpu(str->qc_change);
1184         qc->qc_flags = be32_to_cpu(str->qc_flags);
1185         qc->qc_id = make_kqid(&init_user_ns,
1186                               (qc->qc_flags & GFS2_QCF_USER)?USRQUOTA:GRPQUOTA,
1187                               be32_to_cpu(str->qc_id));
1188 }
1189 
1190 int gfs2_quota_init(struct gfs2_sbd *sdp)
1191 {
1192         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1193         u64 size = i_size_read(sdp->sd_qc_inode);
1194         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1195         unsigned int x, slot = 0;
1196         unsigned int found = 0;
1197         u64 dblock;
1198         u32 extlen = 0;
1199         int error;
1200 
1201         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1202                 return -EIO;
1203 
1204         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1205         sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1206 
1207         error = -ENOMEM;
1208 
1209         sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1210                                        sizeof(unsigned char *), GFP_NOFS);
1211         if (!sdp->sd_quota_bitmap)
1212                 return error;
1213 
1214         for (x = 0; x < sdp->sd_quota_chunks; x++) {
1215                 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1216                 if (!sdp->sd_quota_bitmap[x])
1217                         goto fail;
1218         }
1219 
1220         for (x = 0; x < blocks; x++) {
1221                 struct buffer_head *bh;
1222                 unsigned int y;
1223 
1224                 if (!extlen) {
1225                         int new = 0;
1226                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1227                         if (error)
1228                                 goto fail;
1229                 }
1230                 error = -EIO;
1231                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1232                 if (!bh)
1233                         goto fail;
1234                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1235                         brelse(bh);
1236                         goto fail;
1237                 }
1238 
1239                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1240                      y++, slot++) {
1241                         struct gfs2_quota_change_host qc;
1242                         struct gfs2_quota_data *qd;
1243 
1244                         gfs2_quota_change_in(&qc, bh->b_data +
1245                                           sizeof(struct gfs2_meta_header) +
1246                                           y * sizeof(struct gfs2_quota_change));
1247                         if (!qc.qc_change)
1248                                 continue;
1249 
1250                         error = qd_alloc(sdp, qc.qc_id, &qd);
1251                         if (error) {
1252                                 brelse(bh);
1253                                 goto fail;
1254                         }
1255 
1256                         set_bit(QDF_CHANGE, &qd->qd_flags);
1257                         qd->qd_change = qc.qc_change;
1258                         qd->qd_slot = slot;
1259                         qd->qd_slot_count = 1;
1260 
1261                         spin_lock(&qd_lru_lock);
1262                         gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1263                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1264                         atomic_inc(&sdp->sd_quota_count);
1265                         spin_unlock(&qd_lru_lock);
1266 
1267                         found++;
1268                 }
1269 
1270                 brelse(bh);
1271                 dblock++;
1272                 extlen--;
1273         }
1274 
1275         if (found)
1276                 fs_info(sdp, "found %u quota changes\n", found);
1277 
1278         return 0;
1279 
1280 fail:
1281         gfs2_quota_cleanup(sdp);
1282         return error;
1283 }
1284 
1285 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1286 {
1287         struct list_head *head = &sdp->sd_quota_list;
1288         struct gfs2_quota_data *qd;
1289         unsigned int x;
1290 
1291         spin_lock(&qd_lru_lock);
1292         while (!list_empty(head)) {
1293                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1294 
1295                 if (atomic_read(&qd->qd_count) > 1 ||
1296                     (atomic_read(&qd->qd_count) &&
1297                      !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1298                         list_move(&qd->qd_list, head);
1299                         spin_unlock(&qd_lru_lock);
1300                         schedule();
1301                         spin_lock(&qd_lru_lock);
1302                         continue;
1303                 }
1304 
1305                 list_del(&qd->qd_list);
1306                 /* Also remove if this qd exists in the reclaim list */
1307                 if (!list_empty(&qd->qd_reclaim)) {
1308                         list_del_init(&qd->qd_reclaim);
1309                         atomic_dec(&qd_lru_count);
1310                 }
1311                 atomic_dec(&sdp->sd_quota_count);
1312                 spin_unlock(&qd_lru_lock);
1313 
1314                 if (!atomic_read(&qd->qd_count)) {
1315                         gfs2_assert_warn(sdp, !qd->qd_change);
1316                         gfs2_assert_warn(sdp, !qd->qd_slot_count);
1317                 } else
1318                         gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1319                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1320 
1321                 gfs2_glock_put(qd->qd_gl);
1322                 kmem_cache_free(gfs2_quotad_cachep, qd);
1323 
1324                 spin_lock(&qd_lru_lock);
1325         }
1326         spin_unlock(&qd_lru_lock);
1327 
1328         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1329 
1330         if (sdp->sd_quota_bitmap) {
1331                 for (x = 0; x < sdp->sd_quota_chunks; x++)
1332                         kfree(sdp->sd_quota_bitmap[x]);
1333                 kfree(sdp->sd_quota_bitmap);
1334         }
1335 }
1336 
1337 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1338 {
1339         if (error == 0 || error == -EROFS)
1340                 return;
1341         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1342                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1343 }
1344 
1345 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1346                                int (*fxn)(struct super_block *sb, int type),
1347                                unsigned long t, unsigned long *timeo,
1348                                unsigned int *new_timeo)
1349 {
1350         if (t >= *timeo) {
1351                 int error = fxn(sdp->sd_vfs, 0);
1352                 quotad_error(sdp, msg, error);
1353                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1354         } else {
1355                 *timeo -= t;
1356         }
1357 }
1358 
1359 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1360 {
1361         struct gfs2_inode *ip;
1362 
1363         while(1) {
1364                 ip = NULL;
1365                 spin_lock(&sdp->sd_trunc_lock);
1366                 if (!list_empty(&sdp->sd_trunc_list)) {
1367                         ip = list_entry(sdp->sd_trunc_list.next,
1368                                         struct gfs2_inode, i_trunc_list);
1369                         list_del_init(&ip->i_trunc_list);
1370                 }
1371                 spin_unlock(&sdp->sd_trunc_lock);
1372                 if (ip == NULL)
1373                         return;
1374                 gfs2_glock_finish_truncate(ip);
1375         }
1376 }
1377 
1378 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1379         if (!sdp->sd_statfs_force_sync) {
1380                 sdp->sd_statfs_force_sync = 1;
1381                 wake_up(&sdp->sd_quota_wait);
1382         }
1383 }
1384 
1385 
1386 /**
1387  * gfs2_quotad - Write cached quota changes into the quota file
1388  * @sdp: Pointer to GFS2 superblock
1389  *
1390  */
1391 
1392 int gfs2_quotad(void *data)
1393 {
1394         struct gfs2_sbd *sdp = data;
1395         struct gfs2_tune *tune = &sdp->sd_tune;
1396         unsigned long statfs_timeo = 0;
1397         unsigned long quotad_timeo = 0;
1398         unsigned long t = 0;
1399         DEFINE_WAIT(wait);
1400         int empty;
1401 
1402         while (!kthread_should_stop()) {
1403 
1404                 /* Update the master statfs file */
1405                 if (sdp->sd_statfs_force_sync) {
1406                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1407                         quotad_error(sdp, "statfs", error);
1408                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1409                 }
1410                 else
1411                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1412                                            &statfs_timeo,
1413                                            &tune->gt_statfs_quantum);
1414 
1415                 /* Update quota file */
1416                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1417                                    &quotad_timeo, &tune->gt_quota_quantum);
1418 
1419                 /* Check for & recover partially truncated inodes */
1420                 quotad_check_trunc_list(sdp);
1421 
1422                 try_to_freeze();
1423 
1424                 t = min(quotad_timeo, statfs_timeo);
1425 
1426                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1427                 spin_lock(&sdp->sd_trunc_lock);
1428                 empty = list_empty(&sdp->sd_trunc_list);
1429                 spin_unlock(&sdp->sd_trunc_lock);
1430                 if (empty && !sdp->sd_statfs_force_sync)
1431                         t -= schedule_timeout(t);
1432                 else
1433                         t = 0;
1434                 finish_wait(&sdp->sd_quota_wait, &wait);
1435         }
1436 
1437         return 0;
1438 }
1439 
1440 static int gfs2_quota_get_xstate(struct super_block *sb,
1441                                  struct fs_quota_stat *fqs)
1442 {
1443         struct gfs2_sbd *sdp = sb->s_fs_info;
1444 
1445         memset(fqs, 0, sizeof(struct fs_quota_stat));
1446         fqs->qs_version = FS_QSTAT_VERSION;
1447 
1448         switch (sdp->sd_args.ar_quota) {
1449         case GFS2_QUOTA_ON:
1450                 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD);
1451                 /*FALLTHRU*/
1452         case GFS2_QUOTA_ACCOUNT:
1453                 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT);
1454                 break;
1455         case GFS2_QUOTA_OFF:
1456                 break;
1457         }
1458 
1459         if (sdp->sd_quota_inode) {
1460                 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1461                 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks;
1462         }
1463         fqs->qs_uquota.qfs_nextents = 1; /* unsupported */
1464         fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */
1465         fqs->qs_incoredqs = atomic_read(&qd_lru_count);
1466         return 0;
1467 }
1468 
1469 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1470                           struct fs_disk_quota *fdq)
1471 {
1472         struct gfs2_sbd *sdp = sb->s_fs_info;
1473         struct gfs2_quota_lvb *qlvb;
1474         struct gfs2_quota_data *qd;
1475         struct gfs2_holder q_gh;
1476         int error;
1477 
1478         memset(fdq, 0, sizeof(struct fs_disk_quota));
1479 
1480         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1481                 return -ESRCH; /* Crazy XFS error code */
1482 
1483         if ((qid.type != USRQUOTA) &&
1484             (qid.type != GRPQUOTA))
1485                 return -EINVAL;
1486 
1487         error = qd_get(sdp, qid, &qd);
1488         if (error)
1489                 return error;
1490         error = do_glock(qd, FORCE, &q_gh);
1491         if (error)
1492                 goto out;
1493 
1494         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1495         fdq->d_version = FS_DQUOT_VERSION;
1496         fdq->d_flags = (qid.type == USRQUOTA) ? FS_USER_QUOTA : FS_GROUP_QUOTA;
1497         fdq->d_id = from_kqid_munged(current_user_ns(), qid);
1498         fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift;
1499         fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift;
1500         fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift;
1501 
1502         gfs2_glock_dq_uninit(&q_gh);
1503 out:
1504         qd_put(qd);
1505         return error;
1506 }
1507 
1508 /* GFS2 only supports a subset of the XFS fields */
1509 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT)
1510 
1511 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1512                           struct fs_disk_quota *fdq)
1513 {
1514         struct gfs2_sbd *sdp = sb->s_fs_info;
1515         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1516         struct gfs2_quota_data *qd;
1517         struct gfs2_holder q_gh, i_gh;
1518         unsigned int data_blocks, ind_blocks;
1519         unsigned int blocks = 0;
1520         int alloc_required;
1521         loff_t offset;
1522         int error;
1523 
1524         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1525                 return -ESRCH; /* Crazy XFS error code */
1526 
1527         if ((qid.type != USRQUOTA) &&
1528             (qid.type != GRPQUOTA))
1529                 return -EINVAL;
1530 
1531         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1532                 return -EINVAL;
1533 
1534         error = qd_get(sdp, qid, &qd);
1535         if (error)
1536                 return error;
1537 
1538         error = gfs2_rs_alloc(ip);
1539         if (error)
1540                 goto out_put;
1541 
1542         mutex_lock(&ip->i_inode.i_mutex);
1543         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1544         if (error)
1545                 goto out_unlockput;
1546         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1547         if (error)
1548                 goto out_q;
1549 
1550         /* Check for existing entry, if none then alloc new blocks */
1551         error = update_qd(sdp, qd);
1552         if (error)
1553                 goto out_i;
1554 
1555         /* If nothing has changed, this is a no-op */
1556         if ((fdq->d_fieldmask & FS_DQ_BSOFT) &&
1557             ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1558                 fdq->d_fieldmask ^= FS_DQ_BSOFT;
1559 
1560         if ((fdq->d_fieldmask & FS_DQ_BHARD) &&
1561             ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1562                 fdq->d_fieldmask ^= FS_DQ_BHARD;
1563 
1564         if ((fdq->d_fieldmask & FS_DQ_BCOUNT) &&
1565             ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1566                 fdq->d_fieldmask ^= FS_DQ_BCOUNT;
1567 
1568         if (fdq->d_fieldmask == 0)
1569                 goto out_i;
1570 
1571         offset = qd2offset(qd);
1572         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1573         if (gfs2_is_stuffed(ip))
1574                 alloc_required = 1;
1575         if (alloc_required) {
1576                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1577                                        &data_blocks, &ind_blocks);
1578                 blocks = 1 + data_blocks + ind_blocks;
1579                 error = gfs2_inplace_reserve(ip, blocks, 0);
1580                 if (error)
1581                         goto out_i;
1582                 blocks += gfs2_rg_blocks(ip, blocks);
1583         }
1584 
1585         /* Some quotas span block boundaries and can update two blocks,
1586            adding an extra block to the transaction to handle such quotas */
1587         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1588         if (error)
1589                 goto out_release;
1590 
1591         /* Apply changes */
1592         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1593 
1594         gfs2_trans_end(sdp);
1595 out_release:
1596         if (alloc_required)
1597                 gfs2_inplace_release(ip);
1598 out_i:
1599         gfs2_glock_dq_uninit(&i_gh);
1600 out_q:
1601         gfs2_glock_dq_uninit(&q_gh);
1602 out_unlockput:
1603         mutex_unlock(&ip->i_inode.i_mutex);
1604 out_put:
1605         qd_put(qd);
1606         return error;
1607 }
1608 
1609 const struct quotactl_ops gfs2_quotactl_ops = {
1610         .quota_sync     = gfs2_quota_sync,
1611         .get_xstate     = gfs2_quota_get_xstate,
1612         .get_dqblk      = gfs2_get_dqblk,
1613         .set_dqblk      = gfs2_set_dqblk,
1614 };
1615 

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