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Ath5k: lock beacons
[linux-2.6/mini2440.git] / fs / gfs2 / quota.c
blob3e073f5144fa00abf87fb18c678ae7410c3b478c
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 to a quota check
19 * program to be run on node crashes or anything like that.
20 *
21 * There are couple of knobs that let the administrator manage the quota
22 * fuzziness. "quota_quantum" sets the maximum time a quota change can be
23 * sitting on one node before being synced to the quota file. (The default is
24 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency
25 * of quota file syncs increases as the user moves closer to their limit. The
26 * more frequent the syncs, the more accurate the quota enforcement, but that
27 * means that there is more contention between the nodes for the quota file.
28 * The default value is one. This sets the maximum theoretical quota overrun
29 * (with infinite node with infinite bandwidth) to twice the user's limit. (In
30 * practice, the maximum overrun you see should be much less.) A "quota_scale"
31 * number greater than one makes quota syncs more frequent and reduces the
32 * maximum overrun. Numbers less than one (but greater than zero) make quota
33 * syncs less frequent.
34 *
35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of
36 * the quota file, so it is not being constantly read.
37 */
38
39 #include <linux/sched.h>
40 #include <linux/slab.h>
41 #include <linux/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/lm_interface.h>
49
50 #include "gfs2.h"
51 #include "incore.h"
52 #include "bmap.h"
53 #include "glock.h"
54 #include "glops.h"
55 #include "log.h"
56 #include "meta_io.h"
57 #include "quota.h"
58 #include "rgrp.h"
59 #include "super.h"
60 #include "trans.h"
61 #include "inode.h"
62 #include "ops_address.h"
63 #include "util.h"
64
65 #define QUOTA_USER 1
66 #define QUOTA_GROUP 0
67
68 struct gfs2_quota_host {
69 u64 qu_limit;
70 u64 qu_warn;
71 s64 qu_value;
72 u32 qu_ll_next;
73 };
74
75 struct gfs2_quota_change_host {
76 u64 qc_change;
77 u32 qc_flags; /* GFS2_QCF_... */
78 u32 qc_id;
79 };
80
81 static u64 qd2offset(struct gfs2_quota_data *qd)
82 {
83 u64 offset;
84
85 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
86 offset *= sizeof(struct gfs2_quota);
87
88 return offset;
89 }
90
91 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
92 struct gfs2_quota_data **qdp)
93 {
94 struct gfs2_quota_data *qd;
95 int error;
96
97 qd = kzalloc(sizeof(struct gfs2_quota_data), GFP_NOFS);
98 if (!qd)
99 return -ENOMEM;
100
101 qd->qd_count = 1;
102 qd->qd_id = id;
103 if (user)
104 set_bit(QDF_USER, &qd->qd_flags);
105 qd->qd_slot = -1;
106
107 error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
108 &gfs2_quota_glops, CREATE, &qd->qd_gl);
109 if (error)
110 goto fail;
111
112 error = gfs2_lvb_hold(qd->qd_gl);
113 gfs2_glock_put(qd->qd_gl);
114 if (error)
115 goto fail;
116
117 *qdp = qd;
118
119 return 0;
120
121 fail:
122 kfree(qd);
123 return error;
124 }
125
126 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
127 struct gfs2_quota_data **qdp)
128 {
129 struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
130 int error, found;
131
132 *qdp = NULL;
133
134 for (;;) {
135 found = 0;
136 spin_lock(&sdp->sd_quota_spin);
137 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
138 if (qd->qd_id == id &&
139 !test_bit(QDF_USER, &qd->qd_flags) == !user) {
140 qd->qd_count++;
141 found = 1;
142 break;
143 }
144 }
145
146 if (!found)
147 qd = NULL;
148
149 if (!qd && new_qd) {
150 qd = new_qd;
151 list_add(&qd->qd_list, &sdp->sd_quota_list);
152 atomic_inc(&sdp->sd_quota_count);
153 new_qd = NULL;
154 }
155
156 spin_unlock(&sdp->sd_quota_spin);
157
158 if (qd || !create) {
159 if (new_qd) {
160 gfs2_lvb_unhold(new_qd->qd_gl);
161 kfree(new_qd);
162 }
163 *qdp = qd;
164 return 0;
165 }
166
167 error = qd_alloc(sdp, user, id, &new_qd);
168 if (error)
169 return error;
170 }
171 }
172
173 static void qd_hold(struct gfs2_quota_data *qd)
174 {
175 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
176
177 spin_lock(&sdp->sd_quota_spin);
178 gfs2_assert(sdp, qd->qd_count);
179 qd->qd_count++;
180 spin_unlock(&sdp->sd_quota_spin);
181 }
182
183 static void qd_put(struct gfs2_quota_data *qd)
184 {
185 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
186 spin_lock(&sdp->sd_quota_spin);
187 gfs2_assert(sdp, qd->qd_count);
188 if (!--qd->qd_count)
189 qd->qd_last_touched = jiffies;
190 spin_unlock(&sdp->sd_quota_spin);
191 }
192
193 static int slot_get(struct gfs2_quota_data *qd)
194 {
195 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
196 unsigned int c, o = 0, b;
197 unsigned char byte = 0;
198
199 spin_lock(&sdp->sd_quota_spin);
200
201 if (qd->qd_slot_count++) {
202 spin_unlock(&sdp->sd_quota_spin);
203 return 0;
204 }
205
206 for (c = 0; c < sdp->sd_quota_chunks; c++)
207 for (o = 0; o < PAGE_SIZE; o++) {
208 byte = sdp->sd_quota_bitmap[c][o];
209 if (byte != 0xFF)
210 goto found;
211 }
212
213 goto fail;
214
215 found:
216 for (b = 0; b < 8; b++)
217 if (!(byte & (1 << b)))
218 break;
219 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
220
221 if (qd->qd_slot >= sdp->sd_quota_slots)
222 goto fail;
223
224 sdp->sd_quota_bitmap[c][o] |= 1 << b;
225
226 spin_unlock(&sdp->sd_quota_spin);
227
228 return 0;
229
230 fail:
231 qd->qd_slot_count--;
232 spin_unlock(&sdp->sd_quota_spin);
233 return -ENOSPC;
234 }
235
236 static void slot_hold(struct gfs2_quota_data *qd)
237 {
238 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
239
240 spin_lock(&sdp->sd_quota_spin);
241 gfs2_assert(sdp, qd->qd_slot_count);
242 qd->qd_slot_count++;
243 spin_unlock(&sdp->sd_quota_spin);
244 }
245
246 static void slot_put(struct gfs2_quota_data *qd)
247 {
248 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
249
250 spin_lock(&sdp->sd_quota_spin);
251 gfs2_assert(sdp, qd->qd_slot_count);
252 if (!--qd->qd_slot_count) {
253 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
254 qd->qd_slot = -1;
255 }
256 spin_unlock(&sdp->sd_quota_spin);
257 }
258
259 static int bh_get(struct gfs2_quota_data *qd)
260 {
261 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
262 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
263 unsigned int block, offset;
264 struct buffer_head *bh;
265 int error;
266 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
267
268 mutex_lock(&sdp->sd_quota_mutex);
269
270 if (qd->qd_bh_count++) {
271 mutex_unlock(&sdp->sd_quota_mutex);
272 return 0;
273 }
274
275 block = qd->qd_slot / sdp->sd_qc_per_block;
276 offset = qd->qd_slot % sdp->sd_qc_per_block;
277
278 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
279 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
280 if (error)
281 goto fail;
282 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
283 if (error)
284 goto fail;
285 error = -EIO;
286 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
287 goto fail_brelse;
288
289 qd->qd_bh = bh;
290 qd->qd_bh_qc = (struct gfs2_quota_change *)
291 (bh->b_data + sizeof(struct gfs2_meta_header) +
292 offset * sizeof(struct gfs2_quota_change));
293
294 mutex_unlock(&sdp->sd_quota_mutex);
295
296 return 0;
297
298 fail_brelse:
299 brelse(bh);
300 fail:
301 qd->qd_bh_count--;
302 mutex_unlock(&sdp->sd_quota_mutex);
303 return error;
304 }
305
306 static void bh_put(struct gfs2_quota_data *qd)
307 {
308 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
309
310 mutex_lock(&sdp->sd_quota_mutex);
311 gfs2_assert(sdp, qd->qd_bh_count);
312 if (!--qd->qd_bh_count) {
313 brelse(qd->qd_bh);
314 qd->qd_bh = NULL;
315 qd->qd_bh_qc = NULL;
316 }
317 mutex_unlock(&sdp->sd_quota_mutex);
318 }
319
320 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
321 {
322 struct gfs2_quota_data *qd = NULL;
323 int error;
324 int found = 0;
325
326 *qdp = NULL;
327
328 if (sdp->sd_vfs->s_flags & MS_RDONLY)
329 return 0;
330
331 spin_lock(&sdp->sd_quota_spin);
332
333 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
334 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
335 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
336 qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
337 continue;
338
339 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
340
341 set_bit(QDF_LOCKED, &qd->qd_flags);
342 gfs2_assert_warn(sdp, qd->qd_count);
343 qd->qd_count++;
344 qd->qd_change_sync = qd->qd_change;
345 gfs2_assert_warn(sdp, qd->qd_slot_count);
346 qd->qd_slot_count++;
347 found = 1;
348
349 break;
350 }
351
352 if (!found)
353 qd = NULL;
354
355 spin_unlock(&sdp->sd_quota_spin);
356
357 if (qd) {
358 gfs2_assert_warn(sdp, qd->qd_change_sync);
359 error = bh_get(qd);
360 if (error) {
361 clear_bit(QDF_LOCKED, &qd->qd_flags);
362 slot_put(qd);
363 qd_put(qd);
364 return error;
365 }
366 }
367
368 *qdp = qd;
369
370 return 0;
371 }
372
373 static int qd_trylock(struct gfs2_quota_data *qd)
374 {
375 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
376
377 if (sdp->sd_vfs->s_flags & MS_RDONLY)
378 return 0;
379
380 spin_lock(&sdp->sd_quota_spin);
381
382 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
383 !test_bit(QDF_CHANGE, &qd->qd_flags)) {
384 spin_unlock(&sdp->sd_quota_spin);
385 return 0;
386 }
387
388 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
389
390 set_bit(QDF_LOCKED, &qd->qd_flags);
391 gfs2_assert_warn(sdp, qd->qd_count);
392 qd->qd_count++;
393 qd->qd_change_sync = qd->qd_change;
394 gfs2_assert_warn(sdp, qd->qd_slot_count);
395 qd->qd_slot_count++;
396
397 spin_unlock(&sdp->sd_quota_spin);
398
399 gfs2_assert_warn(sdp, qd->qd_change_sync);
400 if (bh_get(qd)) {
401 clear_bit(QDF_LOCKED, &qd->qd_flags);
402 slot_put(qd);
403 qd_put(qd);
404 return 0;
405 }
406
407 return 1;
408 }
409
410 static void qd_unlock(struct gfs2_quota_data *qd)
411 {
412 gfs2_assert_warn(qd->qd_gl->gl_sbd,
413 test_bit(QDF_LOCKED, &qd->qd_flags));
414 clear_bit(QDF_LOCKED, &qd->qd_flags);
415 bh_put(qd);
416 slot_put(qd);
417 qd_put(qd);
418 }
419
420 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
421 struct gfs2_quota_data **qdp)
422 {
423 int error;
424
425 error = qd_get(sdp, user, id, create, qdp);
426 if (error)
427 return error;
428
429 error = slot_get(*qdp);
430 if (error)
431 goto fail;
432
433 error = bh_get(*qdp);
434 if (error)
435 goto fail_slot;
436
437 return 0;
438
439 fail_slot:
440 slot_put(*qdp);
441 fail:
442 qd_put(*qdp);
443 return error;
444 }
445
446 static void qdsb_put(struct gfs2_quota_data *qd)
447 {
448 bh_put(qd);
449 slot_put(qd);
450 qd_put(qd);
451 }
452
453 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
454 {
455 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
456 struct gfs2_alloc *al = ip->i_alloc;
457 struct gfs2_quota_data **qd = al->al_qd;
458 int error;
459
460 if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
461 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
462 return -EIO;
463
464 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
465 return 0;
466
467 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, CREATE, qd);
468 if (error)
469 goto out;
470 al->al_qd_num++;
471 qd++;
472
473 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, CREATE, qd);
474 if (error)
475 goto out;
476 al->al_qd_num++;
477 qd++;
478
479 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
480 error = qdsb_get(sdp, QUOTA_USER, uid, CREATE, qd);
481 if (error)
482 goto out;
483 al->al_qd_num++;
484 qd++;
485 }
486
487 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
488 error = qdsb_get(sdp, QUOTA_GROUP, gid, CREATE, qd);
489 if (error)
490 goto out;
491 al->al_qd_num++;
492 qd++;
493 }
494
495 out:
496 if (error)
497 gfs2_quota_unhold(ip);
498 return error;
499 }
500
501 void gfs2_quota_unhold(struct gfs2_inode *ip)
502 {
503 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
504 struct gfs2_alloc *al = ip->i_alloc;
505 unsigned int x;
506
507 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
508
509 for (x = 0; x < al->al_qd_num; x++) {
510 qdsb_put(al->al_qd[x]);
511 al->al_qd[x] = NULL;
512 }
513 al->al_qd_num = 0;
514 }
515
516 static int sort_qd(const void *a, const void *b)
517 {
518 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
519 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
520
521 if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
522 !test_bit(QDF_USER, &qd_b->qd_flags)) {
523 if (test_bit(QDF_USER, &qd_a->qd_flags))
524 return -1;
525 else
526 return 1;
527 }
528 if (qd_a->qd_id < qd_b->qd_id)
529 return -1;
530 if (qd_a->qd_id > qd_b->qd_id)
531 return 1;
532
533 return 0;
534 }
535
536 static void do_qc(struct gfs2_quota_data *qd, s64 change)
537 {
538 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
539 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
540 struct gfs2_quota_change *qc = qd->qd_bh_qc;
541 s64 x;
542
543 mutex_lock(&sdp->sd_quota_mutex);
544 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
545
546 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
547 qc->qc_change = 0;
548 qc->qc_flags = 0;
549 if (test_bit(QDF_USER, &qd->qd_flags))
550 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
551 qc->qc_id = cpu_to_be32(qd->qd_id);
552 }
553
554 x = be64_to_cpu(qc->qc_change) + change;
555 qc->qc_change = cpu_to_be64(x);
556
557 spin_lock(&sdp->sd_quota_spin);
558 qd->qd_change = x;
559 spin_unlock(&sdp->sd_quota_spin);
560
561 if (!x) {
562 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
563 clear_bit(QDF_CHANGE, &qd->qd_flags);
564 qc->qc_flags = 0;
565 qc->qc_id = 0;
566 slot_put(qd);
567 qd_put(qd);
568 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
569 qd_hold(qd);
570 slot_hold(qd);
571 }
572
573 mutex_unlock(&sdp->sd_quota_mutex);
574 }
575
576 static void gfs2_quota_in(struct gfs2_quota_host *qu, const void *buf)
577 {
578 const struct gfs2_quota *str = buf;
579
580 qu->qu_limit = be64_to_cpu(str->qu_limit);
581 qu->qu_warn = be64_to_cpu(str->qu_warn);
582 qu->qu_value = be64_to_cpu(str->qu_value);
583 qu->qu_ll_next = be32_to_cpu(str->qu_ll_next);
584 }
585
586 static void gfs2_quota_out(const struct gfs2_quota_host *qu, void *buf)
587 {
588 struct gfs2_quota *str = buf;
589
590 str->qu_limit = cpu_to_be64(qu->qu_limit);
591 str->qu_warn = cpu_to_be64(qu->qu_warn);
592 str->qu_value = cpu_to_be64(qu->qu_value);
593 str->qu_ll_next = cpu_to_be32(qu->qu_ll_next);
594 memset(&str->qu_reserved, 0, sizeof(str->qu_reserved));
595 }
596
597 /**
598 * gfs2_adjust_quota
599 *
600 * This function was mostly borrowed from gfs2_block_truncate_page which was
601 * in turn mostly borrowed from ext3
602 */
603 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
604 s64 change, struct gfs2_quota_data *qd)
605 {
606 struct inode *inode = &ip->i_inode;
607 struct address_space *mapping = inode->i_mapping;
608 unsigned long index = loc >> PAGE_CACHE_SHIFT;
609 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
610 unsigned blocksize, iblock, pos;
611 struct buffer_head *bh;
612 struct page *page;
613 void *kaddr;
614 char *ptr;
615 struct gfs2_quota_host qp;
616 s64 value;
617 int err = -EIO;
618
619 if (gfs2_is_stuffed(ip))
620 gfs2_unstuff_dinode(ip, NULL);
621
622 page = grab_cache_page(mapping, index);
623 if (!page)
624 return -ENOMEM;
625
626 blocksize = inode->i_sb->s_blocksize;
627 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
628
629 if (!page_has_buffers(page))
630 create_empty_buffers(page, blocksize, 0);
631
632 bh = page_buffers(page);
633 pos = blocksize;
634 while (offset >= pos) {
635 bh = bh->b_this_page;
636 iblock++;
637 pos += blocksize;
638 }
639
640 if (!buffer_mapped(bh)) {
641 gfs2_block_map(inode, iblock, bh, 1);
642 if (!buffer_mapped(bh))
643 goto unlock;
644 }
645
646 if (PageUptodate(page))
647 set_buffer_uptodate(bh);
648
649 if (!buffer_uptodate(bh)) {
650 ll_rw_block(READ_META, 1, &bh);
651 wait_on_buffer(bh);
652 if (!buffer_uptodate(bh))
653 goto unlock;
654 }
655
656 gfs2_trans_add_bh(ip->i_gl, bh, 0);
657
658 kaddr = kmap_atomic(page, KM_USER0);
659 ptr = kaddr + offset;
660 gfs2_quota_in(&qp, ptr);
661 qp.qu_value += change;
662 value = qp.qu_value;
663 gfs2_quota_out(&qp, ptr);
664 flush_dcache_page(page);
665 kunmap_atomic(kaddr, KM_USER0);
666 err = 0;
667 qd->qd_qb.qb_magic = cpu_to_be32(GFS2_MAGIC);
668 qd->qd_qb.qb_value = cpu_to_be64(value);
669 ((struct gfs2_quota_lvb*)(qd->qd_gl->gl_lvb))->qb_magic = cpu_to_be32(GFS2_MAGIC);
670 ((struct gfs2_quota_lvb*)(qd->qd_gl->gl_lvb))->qb_value = cpu_to_be64(value);
671 unlock:
672 unlock_page(page);
673 page_cache_release(page);
674 return err;
675 }
676
677 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
678 {
679 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
680 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
681 unsigned int data_blocks, ind_blocks;
682 struct gfs2_holder *ghs, i_gh;
683 unsigned int qx, x;
684 struct gfs2_quota_data *qd;
685 loff_t offset;
686 unsigned int nalloc = 0, blocks;
687 struct gfs2_alloc *al = NULL;
688 int error;
689
690 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
691 &data_blocks, &ind_blocks);
692
693 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
694 if (!ghs)
695 return -ENOMEM;
696
697 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
698 for (qx = 0; qx < num_qd; qx++) {
699 error = gfs2_glock_nq_init(qda[qx]->qd_gl,
700 LM_ST_EXCLUSIVE,
701 GL_NOCACHE, &ghs[qx]);
702 if (error)
703 goto out;
704 }
705
706 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
707 if (error)
708 goto out;
709
710 for (x = 0; x < num_qd; x++) {
711 int alloc_required;
712
713 offset = qd2offset(qda[x]);
714 error = gfs2_write_alloc_required(ip, offset,
715 sizeof(struct gfs2_quota),
716 &alloc_required);
717 if (error)
718 goto out_gunlock;
719 if (alloc_required)
720 nalloc++;
721 }
722
723 al = gfs2_alloc_get(ip);
724 if (!al) {
725 error = -ENOMEM;
726 goto out_gunlock;
727 }
728 /*
729 * 1 blk for unstuffing inode if stuffed. We add this extra
730 * block to the reservation unconditionally. If the inode
731 * doesn't need unstuffing, the block will be released to the
732 * rgrp since it won't be allocated during the transaction
733 */
734 al->al_requested = 1;
735 /* +1 in the end for block requested above for unstuffing */
736 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 1;
737
738 if (nalloc)
739 al->al_requested += nalloc * (data_blocks + ind_blocks);
740 error = gfs2_inplace_reserve(ip);
741 if (error)
742 goto out_alloc;
743
744 if (nalloc)
745 blocks += al->al_rgd->rd_length + nalloc * ind_blocks + RES_STATFS;
746
747 error = gfs2_trans_begin(sdp, blocks, 0);
748 if (error)
749 goto out_ipres;
750
751 for (x = 0; x < num_qd; x++) {
752 qd = qda[x];
753 offset = qd2offset(qd);
754 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync,
755 (struct gfs2_quota_data *)
756 qd);
757 if (error)
758 goto out_end_trans;
759
760 do_qc(qd, -qd->qd_change_sync);
761 }
762
763 error = 0;
764
765 out_end_trans:
766 gfs2_trans_end(sdp);
767 out_ipres:
768 gfs2_inplace_release(ip);
769 out_alloc:
770 gfs2_alloc_put(ip);
771 out_gunlock:
772 gfs2_glock_dq_uninit(&i_gh);
773 out:
774 while (qx--)
775 gfs2_glock_dq_uninit(&ghs[qx]);
776 kfree(ghs);
777 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
778 return error;
779 }
780
781 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
782 struct gfs2_holder *q_gh)
783 {
784 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
785 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
786 struct gfs2_holder i_gh;
787 struct gfs2_quota_host q;
788 char buf[sizeof(struct gfs2_quota)];
789 int error;
790 struct gfs2_quota_lvb *qlvb;
791
792 restart:
793 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
794 if (error)
795 return error;
796
797 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
798
799 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
800 loff_t pos;
801 gfs2_glock_dq_uninit(q_gh);
802 error = gfs2_glock_nq_init(qd->qd_gl,
803 LM_ST_EXCLUSIVE, GL_NOCACHE,
804 q_gh);
805 if (error)
806 return error;
807
808 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
809 if (error)
810 goto fail;
811
812 memset(buf, 0, sizeof(struct gfs2_quota));
813 pos = qd2offset(qd);
814 error = gfs2_internal_read(ip, NULL, buf, &pos,
815 sizeof(struct gfs2_quota));
816 if (error < 0)
817 goto fail_gunlock;
818
819 gfs2_glock_dq_uninit(&i_gh);
820
821
822 gfs2_quota_in(&q, buf);
823 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
824 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
825 qlvb->__pad = 0;
826 qlvb->qb_limit = cpu_to_be64(q.qu_limit);
827 qlvb->qb_warn = cpu_to_be64(q.qu_warn);
828 qlvb->qb_value = cpu_to_be64(q.qu_value);
829 qd->qd_qb = *qlvb;
830
831 if (gfs2_glock_is_blocking(qd->qd_gl)) {
832 gfs2_glock_dq_uninit(q_gh);
833 force_refresh = 0;
834 goto restart;
835 }
836 }
837
838 return 0;
839
840 fail_gunlock:
841 gfs2_glock_dq_uninit(&i_gh);
842 fail:
843 gfs2_glock_dq_uninit(q_gh);
844 return error;
845 }
846
847 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
848 {
849 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
850 struct gfs2_alloc *al = ip->i_alloc;
851 unsigned int x;
852 int error = 0;
853
854 gfs2_quota_hold(ip, uid, gid);
855
856 if (capable(CAP_SYS_RESOURCE) ||
857 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
858 return 0;
859
860 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
861 sort_qd, NULL);
862
863 for (x = 0; x < al->al_qd_num; x++) {
864 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
865 if (error)
866 break;
867 }
868
869 if (!error)
870 set_bit(GIF_QD_LOCKED, &ip->i_flags);
871 else {
872 while (x--)
873 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
874 gfs2_quota_unhold(ip);
875 }
876
877 return error;
878 }
879
880 static int need_sync(struct gfs2_quota_data *qd)
881 {
882 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
883 struct gfs2_tune *gt = &sdp->sd_tune;
884 s64 value;
885 unsigned int num, den;
886 int do_sync = 1;
887
888 if (!qd->qd_qb.qb_limit)
889 return 0;
890
891 spin_lock(&sdp->sd_quota_spin);
892 value = qd->qd_change;
893 spin_unlock(&sdp->sd_quota_spin);
894
895 spin_lock(&gt->gt_spin);
896 num = gt->gt_quota_scale_num;
897 den = gt->gt_quota_scale_den;
898 spin_unlock(&gt->gt_spin);
899
900 if (value < 0)
901 do_sync = 0;
902 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
903 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
904 do_sync = 0;
905 else {
906 value *= gfs2_jindex_size(sdp) * num;
907 value = div_s64(value, den);
908 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
909 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
910 do_sync = 0;
911 }
912
913 return do_sync;
914 }
915
916 void gfs2_quota_unlock(struct gfs2_inode *ip)
917 {
918 struct gfs2_alloc *al = ip->i_alloc;
919 struct gfs2_quota_data *qda[4];
920 unsigned int count = 0;
921 unsigned int x;
922
923 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
924 goto out;
925
926 for (x = 0; x < al->al_qd_num; x++) {
927 struct gfs2_quota_data *qd;
928 int sync;
929
930 qd = al->al_qd[x];
931 sync = need_sync(qd);
932
933 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
934
935 if (sync && qd_trylock(qd))
936 qda[count++] = qd;
937 }
938
939 if (count) {
940 do_sync(count, qda);
941 for (x = 0; x < count; x++)
942 qd_unlock(qda[x]);
943 }
944
945 out:
946 gfs2_quota_unhold(ip);
947 }
948
949 #define MAX_LINE 256
950
951 static int print_message(struct gfs2_quota_data *qd, char *type)
952 {
953 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
954
955 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\r\n",
956 sdp->sd_fsname, type,
957 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
958 qd->qd_id);
959
960 return 0;
961 }
962
963 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
964 {
965 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
966 struct gfs2_alloc *al = ip->i_alloc;
967 struct gfs2_quota_data *qd;
968 s64 value;
969 unsigned int x;
970 int error = 0;
971
972 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
973 return 0;
974
975 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
976 return 0;
977
978 for (x = 0; x < al->al_qd_num; x++) {
979 qd = al->al_qd[x];
980
981 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
982 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
983 continue;
984
985 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
986 spin_lock(&sdp->sd_quota_spin);
987 value += qd->qd_change;
988 spin_unlock(&sdp->sd_quota_spin);
989
990 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
991 print_message(qd, "exceeded");
992 error = -EDQUOT;
993 break;
994 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
995 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
996 time_after_eq(jiffies, qd->qd_last_warn +
997 gfs2_tune_get(sdp,
998 gt_quota_warn_period) * HZ)) {
999 error = print_message(qd, "warning");
1000 qd->qd_last_warn = jiffies;
1001 }
1002 }
1003
1004 return error;
1005 }
1006
1007 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1008 u32 uid, u32 gid)
1009 {
1010 struct gfs2_alloc *al = ip->i_alloc;
1011 struct gfs2_quota_data *qd;
1012 unsigned int x;
1013
1014 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1015 return;
1016 if (ip->i_di.di_flags & GFS2_DIF_SYSTEM)
1017 return;
1018
1019 for (x = 0; x < al->al_qd_num; x++) {
1020 qd = al->al_qd[x];
1021
1022 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1023 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1024 do_qc(qd, change);
1025 }
1026 }
1027 }
1028
1029 int gfs2_quota_sync(struct gfs2_sbd *sdp)
1030 {
1031 struct gfs2_quota_data **qda;
1032 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1033 unsigned int num_qd;
1034 unsigned int x;
1035 int error = 0;
1036
1037 sdp->sd_quota_sync_gen++;
1038
1039 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1040 if (!qda)
1041 return -ENOMEM;
1042
1043 do {
1044 num_qd = 0;
1045
1046 for (;;) {
1047 error = qd_fish(sdp, qda + num_qd);
1048 if (error || !qda[num_qd])
1049 break;
1050 if (++num_qd == max_qd)
1051 break;
1052 }
1053
1054 if (num_qd) {
1055 if (!error)
1056 error = do_sync(num_qd, qda);
1057 if (!error)
1058 for (x = 0; x < num_qd; x++)
1059 qda[x]->qd_sync_gen =
1060 sdp->sd_quota_sync_gen;
1061
1062 for (x = 0; x < num_qd; x++)
1063 qd_unlock(qda[x]);
1064 }
1065 } while (!error && num_qd == max_qd);
1066
1067 kfree(qda);
1068
1069 return error;
1070 }
1071
1072 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1073 {
1074 struct gfs2_quota_data *qd;
1075 struct gfs2_holder q_gh;
1076 int error;
1077
1078 error = qd_get(sdp, user, id, CREATE, &qd);
1079 if (error)
1080 return error;
1081
1082 error = do_glock(qd, FORCE, &q_gh);
1083 if (!error)
1084 gfs2_glock_dq_uninit(&q_gh);
1085
1086 qd_put(qd);
1087
1088 return error;
1089 }
1090
1091 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1092 {
1093 const struct gfs2_quota_change *str = buf;
1094
1095 qc->qc_change = be64_to_cpu(str->qc_change);
1096 qc->qc_flags = be32_to_cpu(str->qc_flags);
1097 qc->qc_id = be32_to_cpu(str->qc_id);
1098 }
1099
1100 int gfs2_quota_init(struct gfs2_sbd *sdp)
1101 {
1102 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1103 unsigned int blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
1104 unsigned int x, slot = 0;
1105 unsigned int found = 0;
1106 u64 dblock;
1107 u32 extlen = 0;
1108 int error;
1109
1110 if (!ip->i_di.di_size || ip->i_di.di_size > (64 << 20) ||
1111 ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1)) {
1112 gfs2_consist_inode(ip);
1113 return -EIO;
1114 }
1115 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1116 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1117
1118 error = -ENOMEM;
1119
1120 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1121 sizeof(unsigned char *), GFP_NOFS);
1122 if (!sdp->sd_quota_bitmap)
1123 return error;
1124
1125 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1126 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1127 if (!sdp->sd_quota_bitmap[x])
1128 goto fail;
1129 }
1130
1131 for (x = 0; x < blocks; x++) {
1132 struct buffer_head *bh;
1133 unsigned int y;
1134
1135 if (!extlen) {
1136 int new = 0;
1137 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1138 if (error)
1139 goto fail;
1140 }
1141 error = -EIO;
1142 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1143 if (!bh)
1144 goto fail;
1145 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1146 brelse(bh);
1147 goto fail;
1148 }
1149
1150 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1151 y++, slot++) {
1152 struct gfs2_quota_change_host qc;
1153 struct gfs2_quota_data *qd;
1154
1155 gfs2_quota_change_in(&qc, bh->b_data +
1156 sizeof(struct gfs2_meta_header) +
1157 y * sizeof(struct gfs2_quota_change));
1158 if (!qc.qc_change)
1159 continue;
1160
1161 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1162 qc.qc_id, &qd);
1163 if (error) {
1164 brelse(bh);
1165 goto fail;
1166 }
1167
1168 set_bit(QDF_CHANGE, &qd->qd_flags);
1169 qd->qd_change = qc.qc_change;
1170 qd->qd_slot = slot;
1171 qd->qd_slot_count = 1;
1172 qd->qd_last_touched = jiffies;
1173
1174 spin_lock(&sdp->sd_quota_spin);
1175 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1176 list_add(&qd->qd_list, &sdp->sd_quota_list);
1177 atomic_inc(&sdp->sd_quota_count);
1178 spin_unlock(&sdp->sd_quota_spin);
1179
1180 found++;
1181 }
1182
1183 brelse(bh);
1184 dblock++;
1185 extlen--;
1186 }
1187
1188 if (found)
1189 fs_info(sdp, "found %u quota changes\n", found);
1190
1191 return 0;
1192
1193 fail:
1194 gfs2_quota_cleanup(sdp);
1195 return error;
1196 }
1197
1198 void gfs2_quota_scan(struct gfs2_sbd *sdp)
1199 {
1200 struct gfs2_quota_data *qd, *safe;
1201 LIST_HEAD(dead);
1202
1203 spin_lock(&sdp->sd_quota_spin);
1204 list_for_each_entry_safe(qd, safe, &sdp->sd_quota_list, qd_list) {
1205 if (!qd->qd_count &&
1206 time_after_eq(jiffies, qd->qd_last_touched +
1207 gfs2_tune_get(sdp, gt_quota_cache_secs) * HZ)) {
1208 list_move(&qd->qd_list, &dead);
1209 gfs2_assert_warn(sdp,
1210 atomic_read(&sdp->sd_quota_count) > 0);
1211 atomic_dec(&sdp->sd_quota_count);
1212 }
1213 }
1214 spin_unlock(&sdp->sd_quota_spin);
1215
1216 while (!list_empty(&dead)) {
1217 qd = list_entry(dead.next, struct gfs2_quota_data, qd_list);
1218 list_del(&qd->qd_list);
1219
1220 gfs2_assert_warn(sdp, !qd->qd_change);
1221 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1222 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1223
1224 gfs2_lvb_unhold(qd->qd_gl);
1225 kfree(qd);
1226 }
1227 }
1228
1229 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1230 {
1231 struct list_head *head = &sdp->sd_quota_list;
1232 struct gfs2_quota_data *qd;
1233 unsigned int x;
1234
1235 spin_lock(&sdp->sd_quota_spin);
1236 while (!list_empty(head)) {
1237 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1238
1239 if (qd->qd_count > 1 ||
1240 (qd->qd_count && !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1241 list_move(&qd->qd_list, head);
1242 spin_unlock(&sdp->sd_quota_spin);
1243 schedule();
1244 spin_lock(&sdp->sd_quota_spin);
1245 continue;
1246 }
1247
1248 list_del(&qd->qd_list);
1249 atomic_dec(&sdp->sd_quota_count);
1250 spin_unlock(&sdp->sd_quota_spin);
1251
1252 if (!qd->qd_count) {
1253 gfs2_assert_warn(sdp, !qd->qd_change);
1254 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1255 } else
1256 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1257 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1258
1259 gfs2_lvb_unhold(qd->qd_gl);
1260 kfree(qd);
1261
1262 spin_lock(&sdp->sd_quota_spin);
1263 }
1264 spin_unlock(&sdp->sd_quota_spin);
1265
1266 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1267
1268 if (sdp->sd_quota_bitmap) {
1269 for (x = 0; x < sdp->sd_quota_chunks; x++)
1270 kfree(sdp->sd_quota_bitmap[x]);
1271 kfree(sdp->sd_quota_bitmap);
1272 }
1273 }
1274
Support for the Chinese Samsung S3C2440 based development boards