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

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.10 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.83 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.153 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.200 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.200 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.76 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ 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 /*
  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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 40 
 41 #include <linux/sched.h>
 42 #include <linux/slab.h>
 43 #include <linux/mm.h>
 44 #include <linux/spinlock.h>
 45 #include <linux/completion.h>
 46 #include <linux/buffer_head.h>
 47 #include <linux/sort.h>
 48 #include <linux/fs.h>
 49 #include <linux/bio.h>
 50 #include <linux/gfs2_ondisk.h>
 51 #include <linux/kthread.h>
 52 #include <linux/freezer.h>
 53 #include <linux/quota.h>
 54 #include <linux/dqblk_xfs.h>
 55 #include <linux/lockref.h>
 56 #include <linux/list_lru.h>
 57 #include <linux/rcupdate.h>
 58 #include <linux/rculist_bl.h>
 59 #include <linux/bit_spinlock.h>
 60 #include <linux/jhash.h>
 61 #include <linux/vmalloc.h>
 62 
 63 #include "gfs2.h"
 64 #include "incore.h"
 65 #include "bmap.h"
 66 #include "glock.h"
 67 #include "glops.h"
 68 #include "log.h"
 69 #include "meta_io.h"
 70 #include "quota.h"
 71 #include "rgrp.h"
 72 #include "super.h"
 73 #include "trans.h"
 74 #include "inode.h"
 75 #include "util.h"
 76 
 77 #define GFS2_QD_HASH_SHIFT      12
 78 #define GFS2_QD_HASH_SIZE       (1 << GFS2_QD_HASH_SHIFT)
 79 #define GFS2_QD_HASH_MASK       (GFS2_QD_HASH_SIZE - 1)
 80 
 81 /* Lock order: qd_lock -> bucket lock -> qd->lockref.lock -> lru lock */
 82 /*                     -> sd_bitmap_lock                              */
 83 static DEFINE_SPINLOCK(qd_lock);
 84 struct list_lru gfs2_qd_lru;
 85 
 86 static struct hlist_bl_head qd_hash_table[GFS2_QD_HASH_SIZE];
 87 
 88 static unsigned int gfs2_qd_hash(const struct gfs2_sbd *sdp,
 89                                  const struct kqid qid)
 90 {
 91         unsigned int h;
 92 
 93         h = jhash(&sdp, sizeof(struct gfs2_sbd *), 0);
 94         h = jhash(&qid, sizeof(struct kqid), h);
 95 
 96         return h & GFS2_QD_HASH_MASK;
 97 }
 98 
 99 static inline void spin_lock_bucket(unsigned int hash)
100 {
101         hlist_bl_lock(&qd_hash_table[hash]);
102 }
103 
104 static inline void spin_unlock_bucket(unsigned int hash)
105 {
106         hlist_bl_unlock(&qd_hash_table[hash]);
107 }
108 
109 static void gfs2_qd_dealloc(struct rcu_head *rcu)
110 {
111         struct gfs2_quota_data *qd = container_of(rcu, struct gfs2_quota_data, qd_rcu);
112         kmem_cache_free(gfs2_quotad_cachep, qd);
113 }
114 
115 static void gfs2_qd_dispose(struct list_head *list)
116 {
117         struct gfs2_quota_data *qd;
118         struct gfs2_sbd *sdp;
119 
120         while (!list_empty(list)) {
121                 qd = list_entry(list->next, struct gfs2_quota_data, qd_lru);
122                 sdp = qd->qd_gl->gl_name.ln_sbd;
123 
124                 list_del(&qd->qd_lru);
125 
126                 /* Free from the filesystem-specific list */
127                 spin_lock(&qd_lock);
128                 list_del(&qd->qd_list);
129                 spin_unlock(&qd_lock);
130 
131                 spin_lock_bucket(qd->qd_hash);
132                 hlist_bl_del_rcu(&qd->qd_hlist);
133                 spin_unlock_bucket(qd->qd_hash);
134 
135                 gfs2_assert_warn(sdp, !qd->qd_change);
136                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
137                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
138 
139                 gfs2_glock_put(qd->qd_gl);
140                 atomic_dec(&sdp->sd_quota_count);
141 
142                 /* Delete it from the common reclaim list */
143                 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
144         }
145 }
146 
147 
148 static enum lru_status gfs2_qd_isolate(struct list_head *item,
149                 struct list_lru_one *lru, spinlock_t *lru_lock, void *arg)
150 {
151         struct list_head *dispose = arg;
152         struct gfs2_quota_data *qd = list_entry(item, struct gfs2_quota_data, qd_lru);
153 
154         if (!spin_trylock(&qd->qd_lockref.lock))
155                 return LRU_SKIP;
156 
157         if (qd->qd_lockref.count == 0) {
158                 lockref_mark_dead(&qd->qd_lockref);
159                 list_lru_isolate_move(lru, &qd->qd_lru, dispose);
160         }
161 
162         spin_unlock(&qd->qd_lockref.lock);
163         return LRU_REMOVED;
164 }
165 
166 static unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
167                                          struct shrink_control *sc)
168 {
169         LIST_HEAD(dispose);
170         unsigned long freed;
171 
172         if (!(sc->gfp_mask & __GFP_FS))
173                 return SHRINK_STOP;
174 
175         freed = list_lru_shrink_walk(&gfs2_qd_lru, sc,
176                                      gfs2_qd_isolate, &dispose);
177 
178         gfs2_qd_dispose(&dispose);
179 
180         return freed;
181 }
182 
183 static unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
184                                           struct shrink_control *sc)
185 {
186         return vfs_pressure_ratio(list_lru_shrink_count(&gfs2_qd_lru, sc));
187 }
188 
189 struct shrinker gfs2_qd_shrinker = {
190         .count_objects = gfs2_qd_shrink_count,
191         .scan_objects = gfs2_qd_shrink_scan,
192         .seeks = DEFAULT_SEEKS,
193         .flags = SHRINKER_NUMA_AWARE,
194 };
195 
196 
197 static u64 qd2index(struct gfs2_quota_data *qd)
198 {
199         struct kqid qid = qd->qd_id;
200         return (2 * (u64)from_kqid(&init_user_ns, qid)) +
201                 ((qid.type == USRQUOTA) ? 0 : 1);
202 }
203 
204 static u64 qd2offset(struct gfs2_quota_data *qd)
205 {
206         u64 offset;
207 
208         offset = qd2index(qd);
209         offset *= sizeof(struct gfs2_quota);
210 
211         return offset;
212 }
213 
214 static struct gfs2_quota_data *qd_alloc(unsigned hash, struct gfs2_sbd *sdp, struct kqid qid)
215 {
216         struct gfs2_quota_data *qd;
217         int error;
218 
219         qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
220         if (!qd)
221                 return NULL;
222 
223         qd->qd_sbd = sdp;
224         qd->qd_lockref.count = 1;
225         spin_lock_init(&qd->qd_lockref.lock);
226         qd->qd_id = qid;
227         qd->qd_slot = -1;
228         INIT_LIST_HEAD(&qd->qd_lru);
229         qd->qd_hash = hash;
230 
231         error = gfs2_glock_get(sdp, qd2index(qd),
232                               &gfs2_quota_glops, CREATE, &qd->qd_gl);
233         if (error)
234                 goto fail;
235 
236         return qd;
237 
238 fail:
239         kmem_cache_free(gfs2_quotad_cachep, qd);
240         return NULL;
241 }
242 
243 static struct gfs2_quota_data *gfs2_qd_search_bucket(unsigned int hash,
244                                                      const struct gfs2_sbd *sdp,
245                                                      struct kqid qid)
246 {
247         struct gfs2_quota_data *qd;
248         struct hlist_bl_node *h;
249 
250         hlist_bl_for_each_entry_rcu(qd, h, &qd_hash_table[hash], qd_hlist) {
251                 if (!qid_eq(qd->qd_id, qid))
252                         continue;
253                 if (qd->qd_sbd != sdp)
254                         continue;
255                 if (lockref_get_not_dead(&qd->qd_lockref)) {
256                         list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
257                         return qd;
258                 }
259         }
260 
261         return NULL;
262 }
263 
264 
265 static int qd_get(struct gfs2_sbd *sdp, struct kqid qid,
266                   struct gfs2_quota_data **qdp)
267 {
268         struct gfs2_quota_data *qd, *new_qd;
269         unsigned int hash = gfs2_qd_hash(sdp, qid);
270 
271         rcu_read_lock();
272         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
273         rcu_read_unlock();
274 
275         if (qd)
276                 return 0;
277 
278         new_qd = qd_alloc(hash, sdp, qid);
279         if (!new_qd)
280                 return -ENOMEM;
281 
282         spin_lock(&qd_lock);
283         spin_lock_bucket(hash);
284         *qdp = qd = gfs2_qd_search_bucket(hash, sdp, qid);
285         if (qd == NULL) {
286                 *qdp = new_qd;
287                 list_add(&new_qd->qd_list, &sdp->sd_quota_list);
288                 hlist_bl_add_head_rcu(&new_qd->qd_hlist, &qd_hash_table[hash]);
289                 atomic_inc(&sdp->sd_quota_count);
290         }
291         spin_unlock_bucket(hash);
292         spin_unlock(&qd_lock);
293 
294         if (qd) {
295                 gfs2_glock_put(new_qd->qd_gl);
296                 kmem_cache_free(gfs2_quotad_cachep, new_qd);
297         }
298 
299         return 0;
300 }
301 
302 
303 static void qd_hold(struct gfs2_quota_data *qd)
304 {
305         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
306         gfs2_assert(sdp, !__lockref_is_dead(&qd->qd_lockref));
307         lockref_get(&qd->qd_lockref);
308 }
309 
310 static void qd_put(struct gfs2_quota_data *qd)
311 {
312         if (lockref_put_or_lock(&qd->qd_lockref))
313                 return;
314 
315         qd->qd_lockref.count = 0;
316         list_lru_add(&gfs2_qd_lru, &qd->qd_lru);
317         spin_unlock(&qd->qd_lockref.lock);
318 
319 }
320 
321 static int slot_get(struct gfs2_quota_data *qd)
322 {
323         struct gfs2_sbd *sdp = qd->qd_sbd;
324         unsigned int bit;
325         int error = 0;
326 
327         spin_lock(&sdp->sd_bitmap_lock);
328         if (qd->qd_slot_count != 0)
329                 goto out;
330 
331         error = -ENOSPC;
332         bit = find_first_zero_bit(sdp->sd_quota_bitmap, sdp->sd_quota_slots);
333         if (bit < sdp->sd_quota_slots) {
334                 set_bit(bit, sdp->sd_quota_bitmap);
335                 qd->qd_slot = bit;
336                 error = 0;
337 out:
338                 qd->qd_slot_count++;
339         }
340         spin_unlock(&sdp->sd_bitmap_lock);
341 
342         return error;
343 }
344 
345 static void slot_hold(struct gfs2_quota_data *qd)
346 {
347         struct gfs2_sbd *sdp = qd->qd_sbd;
348 
349         spin_lock(&sdp->sd_bitmap_lock);
350         gfs2_assert(sdp, qd->qd_slot_count);
351         qd->qd_slot_count++;
352         spin_unlock(&sdp->sd_bitmap_lock);
353 }
354 
355 static void slot_put(struct gfs2_quota_data *qd)
356 {
357         struct gfs2_sbd *sdp = qd->qd_sbd;
358 
359         spin_lock(&sdp->sd_bitmap_lock);
360         gfs2_assert(sdp, qd->qd_slot_count);
361         if (!--qd->qd_slot_count) {
362                 BUG_ON(!test_and_clear_bit(qd->qd_slot, sdp->sd_quota_bitmap));
363                 qd->qd_slot = -1;
364         }
365         spin_unlock(&sdp->sd_bitmap_lock);
366 }
367 
368 static int bh_get(struct gfs2_quota_data *qd)
369 {
370         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
371         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
372         unsigned int block, offset;
373         struct buffer_head *bh;
374         int error;
375         struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
376 
377         mutex_lock(&sdp->sd_quota_mutex);
378 
379         if (qd->qd_bh_count++) {
380                 mutex_unlock(&sdp->sd_quota_mutex);
381                 return 0;
382         }
383 
384         block = qd->qd_slot / sdp->sd_qc_per_block;
385         offset = qd->qd_slot % sdp->sd_qc_per_block;
386 
387         bh_map.b_size = 1 << ip->i_inode.i_blkbits;
388         error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
389         if (error)
390                 goto fail;
391         error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, 0, &bh);
392         if (error)
393                 goto fail;
394         error = -EIO;
395         if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
396                 goto fail_brelse;
397 
398         qd->qd_bh = bh;
399         qd->qd_bh_qc = (struct gfs2_quota_change *)
400                 (bh->b_data + sizeof(struct gfs2_meta_header) +
401                  offset * sizeof(struct gfs2_quota_change));
402 
403         mutex_unlock(&sdp->sd_quota_mutex);
404 
405         return 0;
406 
407 fail_brelse:
408         brelse(bh);
409 fail:
410         qd->qd_bh_count--;
411         mutex_unlock(&sdp->sd_quota_mutex);
412         return error;
413 }
414 
415 static void bh_put(struct gfs2_quota_data *qd)
416 {
417         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
418 
419         mutex_lock(&sdp->sd_quota_mutex);
420         gfs2_assert(sdp, qd->qd_bh_count);
421         if (!--qd->qd_bh_count) {
422                 brelse(qd->qd_bh);
423                 qd->qd_bh = NULL;
424                 qd->qd_bh_qc = NULL;
425         }
426         mutex_unlock(&sdp->sd_quota_mutex);
427 }
428 
429 static int qd_check_sync(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd,
430                          u64 *sync_gen)
431 {
432         if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
433             !test_bit(QDF_CHANGE, &qd->qd_flags) ||
434             (sync_gen && (qd->qd_sync_gen >= *sync_gen)))
435                 return 0;
436 
437         if (!lockref_get_not_dead(&qd->qd_lockref))
438                 return 0;
439 
440         list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
441         set_bit(QDF_LOCKED, &qd->qd_flags);
442         qd->qd_change_sync = qd->qd_change;
443         slot_hold(qd);
444         return 1;
445 }
446 
447 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
448 {
449         struct gfs2_quota_data *qd = NULL;
450         int error;
451         int found = 0;
452 
453         *qdp = NULL;
454 
455         if (sdp->sd_vfs->s_flags & MS_RDONLY)
456                 return 0;
457 
458         spin_lock(&qd_lock);
459 
460         list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
461                 found = qd_check_sync(sdp, qd, &sdp->sd_quota_sync_gen);
462                 if (found)
463                         break;
464         }
465 
466         if (!found)
467                 qd = NULL;
468 
469         spin_unlock(&qd_lock);
470 
471         if (qd) {
472                 gfs2_assert_warn(sdp, qd->qd_change_sync);
473                 error = bh_get(qd);
474                 if (error) {
475                         clear_bit(QDF_LOCKED, &qd->qd_flags);
476                         slot_put(qd);
477                         qd_put(qd);
478                         return error;
479                 }
480         }
481 
482         *qdp = qd;
483 
484         return 0;
485 }
486 
487 static void qd_unlock(struct gfs2_quota_data *qd)
488 {
489         gfs2_assert_warn(qd->qd_gl->gl_name.ln_sbd,
490                          test_bit(QDF_LOCKED, &qd->qd_flags));
491         clear_bit(QDF_LOCKED, &qd->qd_flags);
492         bh_put(qd);
493         slot_put(qd);
494         qd_put(qd);
495 }
496 
497 static int qdsb_get(struct gfs2_sbd *sdp, struct kqid qid,
498                     struct gfs2_quota_data **qdp)
499 {
500         int error;
501 
502         error = qd_get(sdp, qid, qdp);
503         if (error)
504                 return error;
505 
506         error = slot_get(*qdp);
507         if (error)
508                 goto fail;
509 
510         error = bh_get(*qdp);
511         if (error)
512                 goto fail_slot;
513 
514         return 0;
515 
516 fail_slot:
517         slot_put(*qdp);
518 fail:
519         qd_put(*qdp);
520         return error;
521 }
522 
523 static void qdsb_put(struct gfs2_quota_data *qd)
524 {
525         bh_put(qd);
526         slot_put(qd);
527         qd_put(qd);
528 }
529 
530 /**
531  * gfs2_qa_alloc - make sure we have a quota allocations data structure,
532  *                 if necessary
533  * @ip: the inode for this reservation
534  */
535 int gfs2_qa_alloc(struct gfs2_inode *ip)
536 {
537         int error = 0;
538         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
539 
540         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
541                 return 0;
542 
543         down_write(&ip->i_rw_mutex);
544         if (ip->i_qadata == NULL) {
545                 ip->i_qadata = kmem_cache_zalloc(gfs2_qadata_cachep, GFP_NOFS);
546                 if (!ip->i_qadata)
547                         error = -ENOMEM;
548         }
549         up_write(&ip->i_rw_mutex);
550         return error;
551 }
552 
553 void gfs2_qa_delete(struct gfs2_inode *ip, atomic_t *wcount)
554 {
555         down_write(&ip->i_rw_mutex);
556         if (ip->i_qadata && ((wcount == NULL) || (atomic_read(wcount) <= 1))) {
557                 kmem_cache_free(gfs2_qadata_cachep, ip->i_qadata);
558                 ip->i_qadata = NULL;
559         }
560         up_write(&ip->i_rw_mutex);
561 }
562 
563 int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
564 {
565         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
566         struct gfs2_quota_data **qd;
567         int error;
568 
569         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
570                 return 0;
571 
572         if (ip->i_qadata == NULL) {
573                 error = gfs2_rsqa_alloc(ip);
574                 if (error)
575                         return error;
576         }
577 
578         qd = ip->i_qadata->qa_qd;
579 
580         if (gfs2_assert_warn(sdp, !ip->i_qadata->qa_qd_num) ||
581             gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
582                 return -EIO;
583 
584         error = qdsb_get(sdp, make_kqid_uid(ip->i_inode.i_uid), qd);
585         if (error)
586                 goto out;
587         ip->i_qadata->qa_qd_num++;
588         qd++;
589 
590         error = qdsb_get(sdp, make_kqid_gid(ip->i_inode.i_gid), qd);
591         if (error)
592                 goto out;
593         ip->i_qadata->qa_qd_num++;
594         qd++;
595 
596         if (!uid_eq(uid, NO_UID_QUOTA_CHANGE) &&
597             !uid_eq(uid, ip->i_inode.i_uid)) {
598                 error = qdsb_get(sdp, make_kqid_uid(uid), qd);
599                 if (error)
600                         goto out;
601                 ip->i_qadata->qa_qd_num++;
602                 qd++;
603         }
604 
605         if (!gid_eq(gid, NO_GID_QUOTA_CHANGE) &&
606             !gid_eq(gid, ip->i_inode.i_gid)) {
607                 error = qdsb_get(sdp, make_kqid_gid(gid), qd);
608                 if (error)
609                         goto out;
610                 ip->i_qadata->qa_qd_num++;
611                 qd++;
612         }
613 
614 out:
615         if (error)
616                 gfs2_quota_unhold(ip);
617         return error;
618 }
619 
620 void gfs2_quota_unhold(struct gfs2_inode *ip)
621 {
622         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
623         u32 x;
624 
625         if (ip->i_qadata == NULL)
626                 return;
627         gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
628 
629         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
630                 qdsb_put(ip->i_qadata->qa_qd[x]);
631                 ip->i_qadata->qa_qd[x] = NULL;
632         }
633         ip->i_qadata->qa_qd_num = 0;
634 }
635 
636 static int sort_qd(const void *a, const void *b)
637 {
638         const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
639         const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
640 
641         if (qid_lt(qd_a->qd_id, qd_b->qd_id))
642                 return -1;
643         if (qid_lt(qd_b->qd_id, qd_a->qd_id))
644                 return 1;
645         return 0;
646 }
647 
648 static void do_qc(struct gfs2_quota_data *qd, s64 change)
649 {
650         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
651         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
652         struct gfs2_quota_change *qc = qd->qd_bh_qc;
653         s64 x;
654 
655         mutex_lock(&sdp->sd_quota_mutex);
656         gfs2_trans_add_meta(ip->i_gl, qd->qd_bh);
657 
658         if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
659                 qc->qc_change = 0;
660                 qc->qc_flags = 0;
661                 if (qd->qd_id.type == USRQUOTA)
662                         qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
663                 qc->qc_id = cpu_to_be32(from_kqid(&init_user_ns, qd->qd_id));
664         }
665 
666         x = be64_to_cpu(qc->qc_change) + change;
667         qc->qc_change = cpu_to_be64(x);
668 
669         spin_lock(&qd_lock);
670         qd->qd_change = x;
671         spin_unlock(&qd_lock);
672 
673         if (!x) {
674                 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
675                 clear_bit(QDF_CHANGE, &qd->qd_flags);
676                 qc->qc_flags = 0;
677                 qc->qc_id = 0;
678                 slot_put(qd);
679                 qd_put(qd);
680         } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
681                 qd_hold(qd);
682                 slot_hold(qd);
683         }
684 
685         if (change < 0) /* Reset quiet flag if we freed some blocks */
686                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
687         mutex_unlock(&sdp->sd_quota_mutex);
688 }
689 
690 static int gfs2_write_buf_to_page(struct gfs2_inode *ip, unsigned long index,
691                                   unsigned off, void *buf, unsigned bytes)
692 {
693         struct inode *inode = &ip->i_inode;
694         struct gfs2_sbd *sdp = GFS2_SB(inode);
695         struct address_space *mapping = inode->i_mapping;
696         struct page *page;
697         struct buffer_head *bh;
698         void *kaddr;
699         u64 blk;
700         unsigned bsize = sdp->sd_sb.sb_bsize, bnum = 0, boff = 0;
701         unsigned to_write = bytes, pg_off = off;
702         int done = 0;
703 
704         blk = index << (PAGE_SHIFT - sdp->sd_sb.sb_bsize_shift);
705         boff = off % bsize;
706 
707         page = find_or_create_page(mapping, index, GFP_NOFS);
708         if (!page)
709                 return -ENOMEM;
710         if (!page_has_buffers(page))
711                 create_empty_buffers(page, bsize, 0);
712 
713         bh = page_buffers(page);
714         while (!done) {
715                 /* Find the beginning block within the page */
716                 if (pg_off >= ((bnum * bsize) + bsize)) {
717                         bh = bh->b_this_page;
718                         bnum++;
719                         blk++;
720                         continue;
721                 }
722                 if (!buffer_mapped(bh)) {
723                         gfs2_block_map(inode, blk, bh, 1);
724                         if (!buffer_mapped(bh))
725                                 goto unlock_out;
726                         /* If it's a newly allocated disk block, zero it */
727                         if (buffer_new(bh))
728                                 zero_user(page, bnum * bsize, bh->b_size);
729                 }
730                 if (PageUptodate(page))
731                         set_buffer_uptodate(bh);
732                 if (!buffer_uptodate(bh)) {
733                         ll_rw_block(READ | REQ_META, 1, &bh);
734                         wait_on_buffer(bh);
735                         if (!buffer_uptodate(bh))
736                                 goto unlock_out;
737                 }
738                 gfs2_trans_add_data(ip->i_gl, bh);
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;
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 = kcalloc(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, NORMAL_FLUSH);
959         return error;
960 }
961 
962 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd)
963 {
964         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
965         struct gfs2_quota q;
966         struct gfs2_quota_lvb *qlvb;
967         loff_t pos;
968         int error;
969 
970         memset(&q, 0, sizeof(struct gfs2_quota));
971         pos = qd2offset(qd);
972         error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q));
973         if (error < 0)
974                 return error;
975 
976         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
977         qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
978         qlvb->__pad = 0;
979         qlvb->qb_limit = q.qu_limit;
980         qlvb->qb_warn = q.qu_warn;
981         qlvb->qb_value = q.qu_value;
982         qd->qd_qb = *qlvb;
983 
984         return 0;
985 }
986 
987 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
988                     struct gfs2_holder *q_gh)
989 {
990         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
991         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
992         struct gfs2_holder i_gh;
993         int error;
994 
995 restart:
996         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
997         if (error)
998                 return error;
999 
1000         if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags))
1001                 force_refresh = FORCE;
1002 
1003         qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1004 
1005         if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
1006                 gfs2_glock_dq_uninit(q_gh);
1007                 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE,
1008                                            GL_NOCACHE, q_gh);
1009                 if (error)
1010                         return error;
1011 
1012                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1013                 if (error)
1014                         goto fail;
1015 
1016                 error = update_qd(sdp, qd);
1017                 if (error)
1018                         goto fail_gunlock;
1019 
1020                 gfs2_glock_dq_uninit(&i_gh);
1021                 gfs2_glock_dq_uninit(q_gh);
1022                 force_refresh = 0;
1023                 goto restart;
1024         }
1025 
1026         return 0;
1027 
1028 fail_gunlock:
1029         gfs2_glock_dq_uninit(&i_gh);
1030 fail:
1031         gfs2_glock_dq_uninit(q_gh);
1032         return error;
1033 }
1034 
1035 int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid)
1036 {
1037         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1038         struct gfs2_quota_data *qd;
1039         u32 x;
1040         int error = 0;
1041 
1042         if (capable(CAP_SYS_RESOURCE) ||
1043             sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1044                 return 0;
1045 
1046         error = gfs2_quota_hold(ip, uid, gid);
1047         if (error)
1048                 return error;
1049 
1050         sort(ip->i_qadata->qa_qd, ip->i_qadata->qa_qd_num,
1051              sizeof(struct gfs2_quota_data *), sort_qd, NULL);
1052 
1053         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1054                 qd = ip->i_qadata->qa_qd[x];
1055                 error = do_glock(qd, NO_FORCE, &ip->i_qadata->qa_qd_ghs[x]);
1056                 if (error)
1057                         break;
1058         }
1059 
1060         if (!error)
1061                 set_bit(GIF_QD_LOCKED, &ip->i_flags);
1062         else {
1063                 while (x--)
1064                         gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1065                 gfs2_quota_unhold(ip);
1066         }
1067 
1068         return error;
1069 }
1070 
1071 static int need_sync(struct gfs2_quota_data *qd)
1072 {
1073         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1074         struct gfs2_tune *gt = &sdp->sd_tune;
1075         s64 value;
1076         unsigned int num, den;
1077         int do_sync = 1;
1078 
1079         if (!qd->qd_qb.qb_limit)
1080                 return 0;
1081 
1082         spin_lock(&qd_lock);
1083         value = qd->qd_change;
1084         spin_unlock(&qd_lock);
1085 
1086         spin_lock(&gt->gt_spin);
1087         num = gt->gt_quota_scale_num;
1088         den = gt->gt_quota_scale_den;
1089         spin_unlock(&gt->gt_spin);
1090 
1091         if (value < 0)
1092                 do_sync = 0;
1093         else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
1094                  (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1095                 do_sync = 0;
1096         else {
1097                 value *= gfs2_jindex_size(sdp) * num;
1098                 value = div_s64(value, den);
1099                 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
1100                 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
1101                         do_sync = 0;
1102         }
1103 
1104         return do_sync;
1105 }
1106 
1107 void gfs2_quota_unlock(struct gfs2_inode *ip)
1108 {
1109         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1110         struct gfs2_quota_data *qda[4];
1111         unsigned int count = 0;
1112         u32 x;
1113         int found;
1114 
1115         if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
1116                 goto out;
1117 
1118         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1119                 struct gfs2_quota_data *qd;
1120                 int sync;
1121 
1122                 qd = ip->i_qadata->qa_qd[x];
1123                 sync = need_sync(qd);
1124 
1125                 gfs2_glock_dq_uninit(&ip->i_qadata->qa_qd_ghs[x]);
1126                 if (!sync)
1127                         continue;
1128 
1129                 spin_lock(&qd_lock);
1130                 found = qd_check_sync(sdp, qd, NULL);
1131                 spin_unlock(&qd_lock);
1132 
1133                 if (!found)
1134                         continue;
1135 
1136                 gfs2_assert_warn(sdp, qd->qd_change_sync);
1137                 if (bh_get(qd)) {
1138                         clear_bit(QDF_LOCKED, &qd->qd_flags);
1139                         slot_put(qd);
1140                         qd_put(qd);
1141                         continue;
1142                 }
1143 
1144                 qda[count++] = qd;
1145         }
1146 
1147         if (count) {
1148                 do_sync(count, qda);
1149                 for (x = 0; x < count; x++)
1150                         qd_unlock(qda[x]);
1151         }
1152 
1153 out:
1154         gfs2_quota_unhold(ip);
1155 }
1156 
1157 #define MAX_LINE 256
1158 
1159 static int print_message(struct gfs2_quota_data *qd, char *type)
1160 {
1161         struct gfs2_sbd *sdp = qd->qd_gl->gl_name.ln_sbd;
1162 
1163         fs_info(sdp, "quota %s for %s %u\n",
1164                 type,
1165                 (qd->qd_id.type == USRQUOTA) ? "user" : "group",
1166                 from_kqid(&init_user_ns, qd->qd_id));
1167 
1168         return 0;
1169 }
1170 
1171 /**
1172  * gfs2_quota_check - check if allocating new blocks will exceed quota
1173  * @ip:  The inode for which this check is being performed
1174  * @uid: The uid to check against
1175  * @gid: The gid to check against
1176  * @ap:  The allocation parameters. ap->target contains the requested
1177  *       blocks. ap->min_target, if set, contains the minimum blks
1178  *       requested.
1179  *
1180  * Returns: 0 on success.
1181  *                  min_req = ap->min_target ? ap->min_target : ap->target;
1182  *                  quota must allow atleast min_req blks for success and
1183  *                  ap->allowed is set to the number of blocks allowed
1184  *
1185  *          -EDQUOT otherwise, quota violation. ap->allowed is set to number
1186  *                  of blocks available.
1187  */
1188 int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
1189                      struct gfs2_alloc_parms *ap)
1190 {
1191         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1192         struct gfs2_quota_data *qd;
1193         s64 value, warn, limit;
1194         u32 x;
1195         int error = 0;
1196 
1197         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
1198         if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
1199                 return 0;
1200 
1201         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
1202                 return 0;
1203 
1204         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1205                 qd = ip->i_qadata->qa_qd[x];
1206 
1207                 if (!(qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1208                       qid_eq(qd->qd_id, make_kqid_gid(gid))))
1209                         continue;
1210 
1211                 warn = (s64)be64_to_cpu(qd->qd_qb.qb_warn);
1212                 limit = (s64)be64_to_cpu(qd->qd_qb.qb_limit);
1213                 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
1214                 spin_lock(&qd_lock);
1215                 value += qd->qd_change;
1216                 spin_unlock(&qd_lock);
1217 
1218                 if (limit > 0 && (limit - value) < ap->allowed)
1219                         ap->allowed = limit - value;
1220                 /* If we can't meet the target */
1221                 if (limit && limit < (value + (s64)ap->target)) {
1222                         /* If no min_target specified or we don't meet
1223                          * min_target, return -EDQUOT */
1224                         if (!ap->min_target || ap->min_target > ap->allowed) {
1225                                 if (!test_and_set_bit(QDF_QMSG_QUIET,
1226                                                       &qd->qd_flags)) {
1227                                         print_message(qd, "exceeded");
1228                                         quota_send_warning(qd->qd_id,
1229                                                            sdp->sd_vfs->s_dev,
1230                                                            QUOTA_NL_BHARDWARN);
1231                                 }
1232                                 error = -EDQUOT;
1233                                 break;
1234                         }
1235                 } else if (warn && warn < value &&
1236                            time_after_eq(jiffies, qd->qd_last_warn +
1237                                          gfs2_tune_get(sdp, gt_quota_warn_period)
1238                                          * HZ)) {
1239                         quota_send_warning(qd->qd_id,
1240                                            sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN);
1241                         error = print_message(qd, "warning");
1242                         qd->qd_last_warn = jiffies;
1243                 }
1244         }
1245         return error;
1246 }
1247 
1248 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1249                        kuid_t uid, kgid_t gid)
1250 {
1251         struct gfs2_quota_data *qd;
1252         u32 x;
1253         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1254 
1255         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON ||
1256             gfs2_assert_warn(sdp, change))
1257                 return;
1258         if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1259                 return;
1260 
1261         for (x = 0; x < ip->i_qadata->qa_qd_num; x++) {
1262                 qd = ip->i_qadata->qa_qd[x];
1263 
1264                 if (qid_eq(qd->qd_id, make_kqid_uid(uid)) ||
1265                     qid_eq(qd->qd_id, make_kqid_gid(gid))) {
1266                         do_qc(qd, change);
1267                 }
1268         }
1269 }
1270 
1271 int gfs2_quota_sync(struct super_block *sb, int type)
1272 {
1273         struct gfs2_sbd *sdp = sb->s_fs_info;
1274         struct gfs2_quota_data **qda;
1275         unsigned int max_qd = PAGE_SIZE/sizeof(struct gfs2_holder);
1276         unsigned int num_qd;
1277         unsigned int x;
1278         int error = 0;
1279 
1280         qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1281         if (!qda)
1282                 return -ENOMEM;
1283 
1284         mutex_lock(&sdp->sd_quota_sync_mutex);
1285         sdp->sd_quota_sync_gen++;
1286 
1287         do {
1288                 num_qd = 0;
1289 
1290                 for (;;) {
1291                         error = qd_fish(sdp, qda + num_qd);
1292                         if (error || !qda[num_qd])
1293                                 break;
1294                         if (++num_qd == max_qd)
1295                                 break;
1296                 }
1297 
1298                 if (num_qd) {
1299                         if (!error)
1300                                 error = do_sync(num_qd, qda);
1301                         if (!error)
1302                                 for (x = 0; x < num_qd; x++)
1303                                         qda[x]->qd_sync_gen =
1304                                                 sdp->sd_quota_sync_gen;
1305 
1306                         for (x = 0; x < num_qd; x++)
1307                                 qd_unlock(qda[x]);
1308                 }
1309         } while (!error && num_qd == max_qd);
1310 
1311         mutex_unlock(&sdp->sd_quota_sync_mutex);
1312         kfree(qda);
1313 
1314         return error;
1315 }
1316 
1317 int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid)
1318 {
1319         struct gfs2_quota_data *qd;
1320         struct gfs2_holder q_gh;
1321         int error;
1322 
1323         error = qd_get(sdp, qid, &qd);
1324         if (error)
1325                 return error;
1326 
1327         error = do_glock(qd, FORCE, &q_gh);
1328         if (!error)
1329                 gfs2_glock_dq_uninit(&q_gh);
1330 
1331         qd_put(qd);
1332         return error;
1333 }
1334 
1335 int gfs2_quota_init(struct gfs2_sbd *sdp)
1336 {
1337         struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1338         u64 size = i_size_read(sdp->sd_qc_inode);
1339         unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift;
1340         unsigned int x, slot = 0;
1341         unsigned int found = 0;
1342         unsigned int hash;
1343         unsigned int bm_size;
1344         u64 dblock;
1345         u32 extlen = 0;
1346         int error;
1347 
1348         if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20))
1349                 return -EIO;
1350 
1351         sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1352         bm_size = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * sizeof(unsigned long));
1353         bm_size *= sizeof(unsigned long);
1354         error = -ENOMEM;
1355         sdp->sd_quota_bitmap = kzalloc(bm_size, GFP_NOFS | __GFP_NOWARN);
1356         if (sdp->sd_quota_bitmap == NULL)
1357                 sdp->sd_quota_bitmap = __vmalloc(bm_size, GFP_NOFS |
1358                                                  __GFP_ZERO, PAGE_KERNEL);
1359         if (!sdp->sd_quota_bitmap)
1360                 return error;
1361 
1362         for (x = 0; x < blocks; x++) {
1363                 struct buffer_head *bh;
1364                 const struct gfs2_quota_change *qc;
1365                 unsigned int y;
1366 
1367                 if (!extlen) {
1368                         int new = 0;
1369                         error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1370                         if (error)
1371                                 goto fail;
1372                 }
1373                 error = -EIO;
1374                 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1375                 if (!bh)
1376                         goto fail;
1377                 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1378                         brelse(bh);
1379                         goto fail;
1380                 }
1381 
1382                 qc = (const struct gfs2_quota_change *)(bh->b_data + sizeof(struct gfs2_meta_header));
1383                 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1384                      y++, slot++) {
1385                         struct gfs2_quota_data *qd;
1386                         s64 qc_change = be64_to_cpu(qc->qc_change);
1387                         u32 qc_flags = be32_to_cpu(qc->qc_flags);
1388                         enum quota_type qtype = (qc_flags & GFS2_QCF_USER) ?
1389                                                 USRQUOTA : GRPQUOTA;
1390                         struct kqid qc_id = make_kqid(&init_user_ns, qtype,
1391                                                       be32_to_cpu(qc->qc_id));
1392                         qc++;
1393                         if (!qc_change)
1394                                 continue;
1395 
1396                         hash = gfs2_qd_hash(sdp, qc_id);
1397                         qd = qd_alloc(hash, sdp, qc_id);
1398                         if (qd == NULL) {
1399                                 brelse(bh);
1400                                 goto fail;
1401                         }
1402 
1403                         set_bit(QDF_CHANGE, &qd->qd_flags);
1404                         qd->qd_change = qc_change;
1405                         qd->qd_slot = slot;
1406                         qd->qd_slot_count = 1;
1407 
1408                         spin_lock(&qd_lock);
1409                         BUG_ON(test_and_set_bit(slot, sdp->sd_quota_bitmap));
1410                         list_add(&qd->qd_list, &sdp->sd_quota_list);
1411                         atomic_inc(&sdp->sd_quota_count);
1412                         spin_unlock(&qd_lock);
1413 
1414                         spin_lock_bucket(hash);
1415                         hlist_bl_add_head_rcu(&qd->qd_hlist, &qd_hash_table[hash]);
1416                         spin_unlock_bucket(hash);
1417 
1418                         found++;
1419                 }
1420 
1421                 brelse(bh);
1422                 dblock++;
1423                 extlen--;
1424         }
1425 
1426         if (found)
1427                 fs_info(sdp, "found %u quota changes\n", found);
1428 
1429         return 0;
1430 
1431 fail:
1432         gfs2_quota_cleanup(sdp);
1433         return error;
1434 }
1435 
1436 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1437 {
1438         struct list_head *head = &sdp->sd_quota_list;
1439         struct gfs2_quota_data *qd;
1440 
1441         spin_lock(&qd_lock);
1442         while (!list_empty(head)) {
1443                 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1444 
1445                 list_del(&qd->qd_list);
1446 
1447                 /* Also remove if this qd exists in the reclaim list */
1448                 list_lru_del(&gfs2_qd_lru, &qd->qd_lru);
1449                 atomic_dec(&sdp->sd_quota_count);
1450                 spin_unlock(&qd_lock);
1451 
1452                 spin_lock_bucket(qd->qd_hash);
1453                 hlist_bl_del_rcu(&qd->qd_hlist);
1454                 spin_unlock_bucket(qd->qd_hash);
1455 
1456                 gfs2_assert_warn(sdp, !qd->qd_change);
1457                 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1458                 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1459 
1460                 gfs2_glock_put(qd->qd_gl);
1461                 call_rcu(&qd->qd_rcu, gfs2_qd_dealloc);
1462 
1463                 spin_lock(&qd_lock);
1464         }
1465         spin_unlock(&qd_lock);
1466 
1467         gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1468 
1469         kvfree(sdp->sd_quota_bitmap);
1470         sdp->sd_quota_bitmap = NULL;
1471 }
1472 
1473 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1474 {
1475         if (error == 0 || error == -EROFS)
1476                 return;
1477         if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1478                 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1479 }
1480 
1481 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1482                                int (*fxn)(struct super_block *sb, int type),
1483                                unsigned long t, unsigned long *timeo,
1484                                unsigned int *new_timeo)
1485 {
1486         if (t >= *timeo) {
1487                 int error = fxn(sdp->sd_vfs, 0);
1488                 quotad_error(sdp, msg, error);
1489                 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1490         } else {
1491                 *timeo -= t;
1492         }
1493 }
1494 
1495 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1496 {
1497         struct gfs2_inode *ip;
1498 
1499         while(1) {
1500                 ip = NULL;
1501                 spin_lock(&sdp->sd_trunc_lock);
1502                 if (!list_empty(&sdp->sd_trunc_list)) {
1503                         ip = list_entry(sdp->sd_trunc_list.next,
1504                                         struct gfs2_inode, i_trunc_list);
1505                         list_del_init(&ip->i_trunc_list);
1506                 }
1507                 spin_unlock(&sdp->sd_trunc_lock);
1508                 if (ip == NULL)
1509                         return;
1510                 gfs2_glock_finish_truncate(ip);
1511         }
1512 }
1513 
1514 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) {
1515         if (!sdp->sd_statfs_force_sync) {
1516                 sdp->sd_statfs_force_sync = 1;
1517                 wake_up(&sdp->sd_quota_wait);
1518         }
1519 }
1520 
1521 
1522 /**
1523  * gfs2_quotad - Write cached quota changes into the quota file
1524  * @sdp: Pointer to GFS2 superblock
1525  *
1526  */
1527 
1528 int gfs2_quotad(void *data)
1529 {
1530         struct gfs2_sbd *sdp = data;
1531         struct gfs2_tune *tune = &sdp->sd_tune;
1532         unsigned long statfs_timeo = 0;
1533         unsigned long quotad_timeo = 0;
1534         unsigned long t = 0;
1535         DEFINE_WAIT(wait);
1536         int empty;
1537 
1538         while (!kthread_should_stop()) {
1539 
1540                 /* Update the master statfs file */
1541                 if (sdp->sd_statfs_force_sync) {
1542                         int error = gfs2_statfs_sync(sdp->sd_vfs, 0);
1543                         quotad_error(sdp, "statfs", error);
1544                         statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
1545                 }
1546                 else
1547                         quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1548                                            &statfs_timeo,
1549                                            &tune->gt_statfs_quantum);
1550 
1551                 /* Update quota file */
1552                 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1553                                    &quotad_timeo, &tune->gt_quota_quantum);
1554 
1555                 /* Check for & recover partially truncated inodes */
1556                 quotad_check_trunc_list(sdp);
1557 
1558                 try_to_freeze();
1559 
1560                 t = min(quotad_timeo, statfs_timeo);
1561 
1562                 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE);
1563                 spin_lock(&sdp->sd_trunc_lock);
1564                 empty = list_empty(&sdp->sd_trunc_list);
1565                 spin_unlock(&sdp->sd_trunc_lock);
1566                 if (empty && !sdp->sd_statfs_force_sync)
1567                         t -= schedule_timeout(t);
1568                 else
1569                         t = 0;
1570                 finish_wait(&sdp->sd_quota_wait, &wait);
1571         }
1572 
1573         return 0;
1574 }
1575 
1576 static int gfs2_quota_get_state(struct super_block *sb, struct qc_state *state)
1577 {
1578         struct gfs2_sbd *sdp = sb->s_fs_info;
1579 
1580         memset(state, 0, sizeof(*state));
1581 
1582         switch (sdp->sd_args.ar_quota) {
1583         case GFS2_QUOTA_ON:
1584                 state->s_state[USRQUOTA].flags |= QCI_LIMITS_ENFORCED;
1585                 state->s_state[GRPQUOTA].flags |= QCI_LIMITS_ENFORCED;
1586                 /*FALLTHRU*/
1587         case GFS2_QUOTA_ACCOUNT:
1588                 state->s_state[USRQUOTA].flags |= QCI_ACCT_ENABLED |
1589                                                   QCI_SYSFILE;
1590                 state->s_state[GRPQUOTA].flags |= QCI_ACCT_ENABLED |
1591                                                   QCI_SYSFILE;
1592                 break;
1593         case GFS2_QUOTA_OFF:
1594                 break;
1595         }
1596         if (sdp->sd_quota_inode) {
1597                 state->s_state[USRQUOTA].ino =
1598                                         GFS2_I(sdp->sd_quota_inode)->i_no_addr;
1599                 state->s_state[USRQUOTA].blocks = sdp->sd_quota_inode->i_blocks;
1600         }
1601         state->s_state[USRQUOTA].nextents = 1;  /* unsupported */
1602         state->s_state[GRPQUOTA] = state->s_state[USRQUOTA];
1603         state->s_incoredqs = list_lru_count(&gfs2_qd_lru);
1604         return 0;
1605 }
1606 
1607 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid,
1608                           struct qc_dqblk *fdq)
1609 {
1610         struct gfs2_sbd *sdp = sb->s_fs_info;
1611         struct gfs2_quota_lvb *qlvb;
1612         struct gfs2_quota_data *qd;
1613         struct gfs2_holder q_gh;
1614         int error;
1615 
1616         memset(fdq, 0, sizeof(*fdq));
1617 
1618         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1619                 return -ESRCH; /* Crazy XFS error code */
1620 
1621         if ((qid.type != USRQUOTA) &&
1622             (qid.type != GRPQUOTA))
1623                 return -EINVAL;
1624 
1625         error = qd_get(sdp, qid, &qd);
1626         if (error)
1627                 return error;
1628         error = do_glock(qd, FORCE, &q_gh);
1629         if (error)
1630                 goto out;
1631 
1632         qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr;
1633         fdq->d_spc_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_sb.sb_bsize_shift;
1634         fdq->d_spc_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_sb.sb_bsize_shift;
1635         fdq->d_space = be64_to_cpu(qlvb->qb_value) << sdp->sd_sb.sb_bsize_shift;
1636 
1637         gfs2_glock_dq_uninit(&q_gh);
1638 out:
1639         qd_put(qd);
1640         return error;
1641 }
1642 
1643 /* GFS2 only supports a subset of the XFS fields */
1644 #define GFS2_FIELDMASK (QC_SPC_SOFT|QC_SPC_HARD|QC_SPACE)
1645 
1646 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid,
1647                           struct qc_dqblk *fdq)
1648 {
1649         struct gfs2_sbd *sdp = sb->s_fs_info;
1650         struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
1651         struct gfs2_quota_data *qd;
1652         struct gfs2_holder q_gh, i_gh;
1653         unsigned int data_blocks, ind_blocks;
1654         unsigned int blocks = 0;
1655         int alloc_required;
1656         loff_t offset;
1657         int error;
1658 
1659         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
1660                 return -ESRCH; /* Crazy XFS error code */
1661 
1662         if ((qid.type != USRQUOTA) &&
1663             (qid.type != GRPQUOTA))
1664                 return -EINVAL;
1665 
1666         if (fdq->d_fieldmask & ~GFS2_FIELDMASK)
1667                 return -EINVAL;
1668 
1669         error = qd_get(sdp, qid, &qd);
1670         if (error)
1671                 return error;
1672 
1673         error = gfs2_rsqa_alloc(ip);
1674         if (error)
1675                 goto out_put;
1676 
1677         inode_lock(&ip->i_inode);
1678         error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh);
1679         if (error)
1680                 goto out_unlockput;
1681         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1682         if (error)
1683                 goto out_q;
1684 
1685         /* Check for existing entry, if none then alloc new blocks */
1686         error = update_qd(sdp, qd);
1687         if (error)
1688                 goto out_i;
1689 
1690         /* If nothing has changed, this is a no-op */
1691         if ((fdq->d_fieldmask & QC_SPC_SOFT) &&
1692             ((fdq->d_spc_softlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_warn)))
1693                 fdq->d_fieldmask ^= QC_SPC_SOFT;
1694 
1695         if ((fdq->d_fieldmask & QC_SPC_HARD) &&
1696             ((fdq->d_spc_hardlimit >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_limit)))
1697                 fdq->d_fieldmask ^= QC_SPC_HARD;
1698 
1699         if ((fdq->d_fieldmask & QC_SPACE) &&
1700             ((fdq->d_space >> sdp->sd_sb.sb_bsize_shift) == be64_to_cpu(qd->qd_qb.qb_value)))
1701                 fdq->d_fieldmask ^= QC_SPACE;
1702 
1703         if (fdq->d_fieldmask == 0)
1704                 goto out_i;
1705 
1706         offset = qd2offset(qd);
1707         alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota));
1708         if (gfs2_is_stuffed(ip))
1709                 alloc_required = 1;
1710         if (alloc_required) {
1711                 struct gfs2_alloc_parms ap = { .aflags = 0, };
1712                 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
1713                                        &data_blocks, &ind_blocks);
1714                 blocks = 1 + data_blocks + ind_blocks;
1715                 ap.target = blocks;
1716                 error = gfs2_inplace_reserve(ip, &ap);
1717                 if (error)
1718                         goto out_i;
1719                 blocks += gfs2_rg_blocks(ip, blocks);
1720         }
1721 
1722         /* Some quotas span block boundaries and can update two blocks,
1723            adding an extra block to the transaction to handle such quotas */
1724         error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0);
1725         if (error)
1726                 goto out_release;
1727 
1728         /* Apply changes */
1729         error = gfs2_adjust_quota(ip, offset, 0, qd, fdq);
1730         if (!error)
1731                 clear_bit(QDF_QMSG_QUIET, &qd->qd_flags);
1732 
1733         gfs2_trans_end(sdp);
1734 out_release:
1735         if (alloc_required)
1736                 gfs2_inplace_release(ip);
1737 out_i:
1738         gfs2_glock_dq_uninit(&i_gh);
1739 out_q:
1740         gfs2_glock_dq_uninit(&q_gh);
1741 out_unlockput:
1742         inode_unlock(&ip->i_inode);
1743 out_put:
1744         qd_put(qd);
1745         return error;
1746 }
1747 
1748 const struct quotactl_ops gfs2_quotactl_ops = {
1749         .quota_sync     = gfs2_quota_sync,
1750         .get_state      = gfs2_quota_get_state,
1751         .get_dqblk      = gfs2_get_dqblk,
1752         .set_dqblk      = gfs2_set_dqblk,
1753 };
1754 
1755 void __init gfs2_quota_hash_init(void)
1756 {
1757         unsigned i;
1758 
1759         for(i = 0; i < GFS2_QD_HASH_SIZE; i++)
1760                 INIT_HLIST_BL_HEAD(&qd_hash_table[i]);
1761 }
1762 

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