~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.12-rc1 ] ~ [ linux-5.11.2 ] ~ [ linux-5.10.19 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.101 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.177 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.222 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.258 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.258 ] ~ [ 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 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
 85 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
 86                                  const struct kqid qid)
 87 {
 88         unsigned int h;
 89 
 90         h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
 91         h = jhash(&qid, sizeof(struct kqid), h);
 92 
 93         return h & GFS2_QD_HASH_MASK;
 94 }
 95 
 96 static inline void spin_lock_bucket(unsigned int hash)
 97 {
 98         hlist_bl_lock(&qd_hash_table[hash]);
 99 }
100 
101 static inline void spin_unlock_bucket(unsigned int hash)
102 {
103         hlist_bl_unlock(&qd_hash_table[hash]);
104 }
105 
106 static void gfs2_qd_dealloc(struct rcu_head *rcu)
107 {
108         struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
109         kmem_cache_free(gfs2_quotad_cachep, qd);
110 }
111 
112 static void gfs2_qd_dispose(struct list_head *list)
113 {
114         struct gfs2_quota_data *qd;
115         struct gfs2_sbd *sdp;
116 
117         while (!list_empty(list)) {
118                 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
119                 sdp = qd->qd_gl->gl_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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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  */
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 
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 
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 
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 
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 
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 
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 
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 = loc % PAGE_SIZE;
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 
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 
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 
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 
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 
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 
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->gt_spin);
1088         num = gt->gt_quota_scale_num;
1089         den = gt->gt_quota_scale_den;
1090         spin_unlock(&gt->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 
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 
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  */
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 
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 
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 
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 
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 
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 
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_SHUTDOWN, &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 
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 
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 
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 
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                                    &quotad_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 
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 
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 
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 
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 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp