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[PATCH] tlclk: delete unnecessary sysfs_remove_group
[wandboard.git] / fs / gfs2 / quota.c
blobd0db881b55d2cf34231335d1c2848f1fd131af30
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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_file.h"
63 #include "ops_address.h"
64 #include "util.h"
65
66 #define QUOTA_USER 1
67 #define QUOTA_GROUP 0
68
69 static u64 qd2offset(struct gfs2_quota_data *qd)
70 {
71 u64 offset;
72
73 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
74 offset *= sizeof(struct gfs2_quota);
75
76 return offset;
77 }
78
79 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
80 struct gfs2_quota_data **qdp)
81 {
82 struct gfs2_quota_data *qd;
83 int error;
84
85 qd = kzalloc(sizeof(struct gfs2_quota_data), GFP_KERNEL);
86 if (!qd)
87 return -ENOMEM;
88
89 qd->qd_count = 1;
90 qd->qd_id = id;
91 if (user)
92 set_bit(QDF_USER, &qd->qd_flags);
93 qd->qd_slot = -1;
94
95 error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
96 &gfs2_quota_glops, CREATE, &qd->qd_gl);
97 if (error)
98 goto fail;
99
100 error = gfs2_lvb_hold(qd->qd_gl);
101 gfs2_glock_put(qd->qd_gl);
102 if (error)
103 goto fail;
104
105 *qdp = qd;
106
107 return 0;
108
109 fail:
110 kfree(qd);
111 return error;
112 }
113
114 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
115 struct gfs2_quota_data **qdp)
116 {
117 struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
118 int error, found;
119
120 *qdp = NULL;
121
122 for (;;) {
123 found = 0;
124 spin_lock(&sdp->sd_quota_spin);
125 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
126 if (qd->qd_id == id &&
127 !test_bit(QDF_USER, &qd->qd_flags) == !user) {
128 qd->qd_count++;
129 found = 1;
130 break;
131 }
132 }
133
134 if (!found)
135 qd = NULL;
136
137 if (!qd && new_qd) {
138 qd = new_qd;
139 list_add(&qd->qd_list, &sdp->sd_quota_list);
140 atomic_inc(&sdp->sd_quota_count);
141 new_qd = NULL;
142 }
143
144 spin_unlock(&sdp->sd_quota_spin);
145
146 if (qd || !create) {
147 if (new_qd) {
148 gfs2_lvb_unhold(new_qd->qd_gl);
149 kfree(new_qd);
150 }
151 *qdp = qd;
152 return 0;
153 }
154
155 error = qd_alloc(sdp, user, id, &new_qd);
156 if (error)
157 return error;
158 }
159 }
160
161 static void qd_hold(struct gfs2_quota_data *qd)
162 {
163 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
164
165 spin_lock(&sdp->sd_quota_spin);
166 gfs2_assert(sdp, qd->qd_count);
167 qd->qd_count++;
168 spin_unlock(&sdp->sd_quota_spin);
169 }
170
171 static void qd_put(struct gfs2_quota_data *qd)
172 {
173 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
174 spin_lock(&sdp->sd_quota_spin);
175 gfs2_assert(sdp, qd->qd_count);
176 if (!--qd->qd_count)
177 qd->qd_last_touched = jiffies;
178 spin_unlock(&sdp->sd_quota_spin);
179 }
180
181 static int slot_get(struct gfs2_quota_data *qd)
182 {
183 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
184 unsigned int c, o = 0, b;
185 unsigned char byte = 0;
186
187 spin_lock(&sdp->sd_quota_spin);
188
189 if (qd->qd_slot_count++) {
190 spin_unlock(&sdp->sd_quota_spin);
191 return 0;
192 }
193
194 for (c = 0; c < sdp->sd_quota_chunks; c++)
195 for (o = 0; o < PAGE_SIZE; o++) {
196 byte = sdp->sd_quota_bitmap[c][o];
197 if (byte != 0xFF)
198 goto found;
199 }
200
201 goto fail;
202
203 found:
204 for (b = 0; b < 8; b++)
205 if (!(byte & (1 << b)))
206 break;
207 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
208
209 if (qd->qd_slot >= sdp->sd_quota_slots)
210 goto fail;
211
212 sdp->sd_quota_bitmap[c][o] |= 1 << b;
213
214 spin_unlock(&sdp->sd_quota_spin);
215
216 return 0;
217
218 fail:
219 qd->qd_slot_count--;
220 spin_unlock(&sdp->sd_quota_spin);
221 return -ENOSPC;
222 }
223
224 static void slot_hold(struct gfs2_quota_data *qd)
225 {
226 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
227
228 spin_lock(&sdp->sd_quota_spin);
229 gfs2_assert(sdp, qd->qd_slot_count);
230 qd->qd_slot_count++;
231 spin_unlock(&sdp->sd_quota_spin);
232 }
233
234 static void slot_put(struct gfs2_quota_data *qd)
235 {
236 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
237
238 spin_lock(&sdp->sd_quota_spin);
239 gfs2_assert(sdp, qd->qd_slot_count);
240 if (!--qd->qd_slot_count) {
241 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
242 qd->qd_slot = -1;
243 }
244 spin_unlock(&sdp->sd_quota_spin);
245 }
246
247 static int bh_get(struct gfs2_quota_data *qd)
248 {
249 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
250 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
251 unsigned int block, offset;
252 struct buffer_head *bh;
253 int error;
254 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
255
256 mutex_lock(&sdp->sd_quota_mutex);
257
258 if (qd->qd_bh_count++) {
259 mutex_unlock(&sdp->sd_quota_mutex);
260 return 0;
261 }
262
263 block = qd->qd_slot / sdp->sd_qc_per_block;
264 offset = qd->qd_slot % sdp->sd_qc_per_block;;
265
266 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
267 error = gfs2_block_map(&ip->i_inode, block, 0, &bh_map);
268 if (error)
269 goto fail;
270 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
271 if (error)
272 goto fail;
273 error = -EIO;
274 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
275 goto fail_brelse;
276
277 qd->qd_bh = bh;
278 qd->qd_bh_qc = (struct gfs2_quota_change *)
279 (bh->b_data + sizeof(struct gfs2_meta_header) +
280 offset * sizeof(struct gfs2_quota_change));
281
282 mutex_lock(&sdp->sd_quota_mutex);
283
284 return 0;
285
286 fail_brelse:
287 brelse(bh);
288 fail:
289 qd->qd_bh_count--;
290 mutex_unlock(&sdp->sd_quota_mutex);
291 return error;
292 }
293
294 static void bh_put(struct gfs2_quota_data *qd)
295 {
296 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
297
298 mutex_lock(&sdp->sd_quota_mutex);
299 gfs2_assert(sdp, qd->qd_bh_count);
300 if (!--qd->qd_bh_count) {
301 brelse(qd->qd_bh);
302 qd->qd_bh = NULL;
303 qd->qd_bh_qc = NULL;
304 }
305 mutex_unlock(&sdp->sd_quota_mutex);
306 }
307
308 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
309 {
310 struct gfs2_quota_data *qd = NULL;
311 int error;
312 int found = 0;
313
314 *qdp = NULL;
315
316 if (sdp->sd_vfs->s_flags & MS_RDONLY)
317 return 0;
318
319 spin_lock(&sdp->sd_quota_spin);
320
321 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
322 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
323 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
324 qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
325 continue;
326
327 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
328
329 set_bit(QDF_LOCKED, &qd->qd_flags);
330 gfs2_assert_warn(sdp, qd->qd_count);
331 qd->qd_count++;
332 qd->qd_change_sync = qd->qd_change;
333 gfs2_assert_warn(sdp, qd->qd_slot_count);
334 qd->qd_slot_count++;
335 found = 1;
336
337 break;
338 }
339
340 if (!found)
341 qd = NULL;
342
343 spin_unlock(&sdp->sd_quota_spin);
344
345 if (qd) {
346 gfs2_assert_warn(sdp, qd->qd_change_sync);
347 error = bh_get(qd);
348 if (error) {
349 clear_bit(QDF_LOCKED, &qd->qd_flags);
350 slot_put(qd);
351 qd_put(qd);
352 return error;
353 }
354 }
355
356 *qdp = qd;
357
358 return 0;
359 }
360
361 static int qd_trylock(struct gfs2_quota_data *qd)
362 {
363 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
364
365 if (sdp->sd_vfs->s_flags & MS_RDONLY)
366 return 0;
367
368 spin_lock(&sdp->sd_quota_spin);
369
370 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
371 !test_bit(QDF_CHANGE, &qd->qd_flags)) {
372 spin_unlock(&sdp->sd_quota_spin);
373 return 0;
374 }
375
376 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
377
378 set_bit(QDF_LOCKED, &qd->qd_flags);
379 gfs2_assert_warn(sdp, qd->qd_count);
380 qd->qd_count++;
381 qd->qd_change_sync = qd->qd_change;
382 gfs2_assert_warn(sdp, qd->qd_slot_count);
383 qd->qd_slot_count++;
384
385 spin_unlock(&sdp->sd_quota_spin);
386
387 gfs2_assert_warn(sdp, qd->qd_change_sync);
388 if (bh_get(qd)) {
389 clear_bit(QDF_LOCKED, &qd->qd_flags);
390 slot_put(qd);
391 qd_put(qd);
392 return 0;
393 }
394
395 return 1;
396 }
397
398 static void qd_unlock(struct gfs2_quota_data *qd)
399 {
400 gfs2_assert_warn(qd->qd_gl->gl_sbd,
401 test_bit(QDF_LOCKED, &qd->qd_flags));
402 clear_bit(QDF_LOCKED, &qd->qd_flags);
403 bh_put(qd);
404 slot_put(qd);
405 qd_put(qd);
406 }
407
408 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
409 struct gfs2_quota_data **qdp)
410 {
411 int error;
412
413 error = qd_get(sdp, user, id, create, qdp);
414 if (error)
415 return error;
416
417 error = slot_get(*qdp);
418 if (error)
419 goto fail;
420
421 error = bh_get(*qdp);
422 if (error)
423 goto fail_slot;
424
425 return 0;
426
427 fail_slot:
428 slot_put(*qdp);
429 fail:
430 qd_put(*qdp);
431 return error;
432 }
433
434 static void qdsb_put(struct gfs2_quota_data *qd)
435 {
436 bh_put(qd);
437 slot_put(qd);
438 qd_put(qd);
439 }
440
441 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
442 {
443 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
444 struct gfs2_alloc *al = &ip->i_alloc;
445 struct gfs2_quota_data **qd = al->al_qd;
446 int error;
447
448 if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
449 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
450 return -EIO;
451
452 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
453 return 0;
454
455 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, CREATE, qd);
456 if (error)
457 goto out;
458 al->al_qd_num++;
459 qd++;
460
461 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, CREATE, qd);
462 if (error)
463 goto out;
464 al->al_qd_num++;
465 qd++;
466
467 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
468 error = qdsb_get(sdp, QUOTA_USER, uid, CREATE, qd);
469 if (error)
470 goto out;
471 al->al_qd_num++;
472 qd++;
473 }
474
475 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
476 error = qdsb_get(sdp, QUOTA_GROUP, gid, CREATE, qd);
477 if (error)
478 goto out;
479 al->al_qd_num++;
480 qd++;
481 }
482
483 out:
484 if (error)
485 gfs2_quota_unhold(ip);
486 return error;
487 }
488
489 void gfs2_quota_unhold(struct gfs2_inode *ip)
490 {
491 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
492 struct gfs2_alloc *al = &ip->i_alloc;
493 unsigned int x;
494
495 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
496
497 for (x = 0; x < al->al_qd_num; x++) {
498 qdsb_put(al->al_qd[x]);
499 al->al_qd[x] = NULL;
500 }
501 al->al_qd_num = 0;
502 }
503
504 static int sort_qd(const void *a, const void *b)
505 {
506 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
507 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
508
509 if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
510 !test_bit(QDF_USER, &qd_b->qd_flags)) {
511 if (test_bit(QDF_USER, &qd_a->qd_flags))
512 return -1;
513 else
514 return 1;
515 }
516 if (qd_a->qd_id < qd_b->qd_id)
517 return -1;
518 if (qd_a->qd_id > qd_b->qd_id)
519 return 1;
520
521 return 0;
522 }
523
524 static void do_qc(struct gfs2_quota_data *qd, s64 change)
525 {
526 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
527 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
528 struct gfs2_quota_change *qc = qd->qd_bh_qc;
529 s64 x;
530
531 mutex_lock(&sdp->sd_quota_mutex);
532 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
533
534 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
535 qc->qc_change = 0;
536 qc->qc_flags = 0;
537 if (test_bit(QDF_USER, &qd->qd_flags))
538 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
539 qc->qc_id = cpu_to_be32(qd->qd_id);
540 }
541
542 x = be64_to_cpu(qc->qc_change) + change;
543 qc->qc_change = cpu_to_be64(x);
544
545 spin_lock(&sdp->sd_quota_spin);
546 qd->qd_change = x;
547 spin_unlock(&sdp->sd_quota_spin);
548
549 if (!x) {
550 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
551 clear_bit(QDF_CHANGE, &qd->qd_flags);
552 qc->qc_flags = 0;
553 qc->qc_id = 0;
554 slot_put(qd);
555 qd_put(qd);
556 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
557 qd_hold(qd);
558 slot_hold(qd);
559 }
560
561 mutex_unlock(&sdp->sd_quota_mutex);
562 }
563
564 /**
565 * gfs2_adjust_quota
566 *
567 * This function was mostly borrowed from gfs2_block_truncate_page which was
568 * in turn mostly borrowed from ext3
569 */
570 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
571 s64 change, struct gfs2_quota_data *qd)
572 {
573 struct inode *inode = &ip->i_inode;
574 struct address_space *mapping = inode->i_mapping;
575 unsigned long index = loc >> PAGE_CACHE_SHIFT;
576 unsigned offset = loc & (PAGE_CACHE_SHIFT - 1);
577 unsigned blocksize, iblock, pos;
578 struct buffer_head *bh;
579 struct page *page;
580 void *kaddr;
581 __be64 *ptr;
582 s64 value;
583 int err = -EIO;
584
585 page = grab_cache_page(mapping, index);
586 if (!page)
587 return -ENOMEM;
588
589 blocksize = inode->i_sb->s_blocksize;
590 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
591
592 if (!page_has_buffers(page))
593 create_empty_buffers(page, blocksize, 0);
594
595 bh = page_buffers(page);
596 pos = blocksize;
597 while (offset >= pos) {
598 bh = bh->b_this_page;
599 iblock++;
600 pos += blocksize;
601 }
602
603 if (!buffer_mapped(bh)) {
604 gfs2_get_block(inode, iblock, bh, 1);
605 if (!buffer_mapped(bh))
606 goto unlock;
607 }
608
609 if (PageUptodate(page))
610 set_buffer_uptodate(bh);
611
612 if (!buffer_uptodate(bh)) {
613 ll_rw_block(READ_META, 1, &bh);
614 wait_on_buffer(bh);
615 if (!buffer_uptodate(bh))
616 goto unlock;
617 }
618
619 gfs2_trans_add_bh(ip->i_gl, bh, 0);
620
621 kaddr = kmap_atomic(page, KM_USER0);
622 ptr = kaddr + offset;
623 value = (s64)be64_to_cpu(*ptr) + change;
624 *ptr = cpu_to_be64(value);
625 flush_dcache_page(page);
626 kunmap_atomic(kaddr, KM_USER0);
627 err = 0;
628 qd->qd_qb.qb_magic = cpu_to_be32(GFS2_MAGIC);
629 qd->qd_qb.qb_value = cpu_to_be64(value);
630 unlock:
631 unlock_page(page);
632 page_cache_release(page);
633 return err;
634 }
635
636 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
637 {
638 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
639 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
640 unsigned int data_blocks, ind_blocks;
641 struct gfs2_holder *ghs, i_gh;
642 unsigned int qx, x;
643 struct gfs2_quota_data *qd;
644 loff_t offset;
645 unsigned int nalloc = 0;
646 struct gfs2_alloc *al = NULL;
647 int error;
648
649 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
650 &data_blocks, &ind_blocks);
651
652 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_KERNEL);
653 if (!ghs)
654 return -ENOMEM;
655
656 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
657 for (qx = 0; qx < num_qd; qx++) {
658 error = gfs2_glock_nq_init(qda[qx]->qd_gl,
659 LM_ST_EXCLUSIVE,
660 GL_NOCACHE, &ghs[qx]);
661 if (error)
662 goto out;
663 }
664
665 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
666 if (error)
667 goto out;
668
669 for (x = 0; x < num_qd; x++) {
670 int alloc_required;
671
672 offset = qd2offset(qda[x]);
673 error = gfs2_write_alloc_required(ip, offset,
674 sizeof(struct gfs2_quota),
675 &alloc_required);
676 if (error)
677 goto out_gunlock;
678 if (alloc_required)
679 nalloc++;
680 }
681
682 if (nalloc) {
683 al = gfs2_alloc_get(ip);
684
685 al->al_requested = nalloc * (data_blocks + ind_blocks);
686
687 error = gfs2_inplace_reserve(ip);
688 if (error)
689 goto out_alloc;
690
691 error = gfs2_trans_begin(sdp,
692 al->al_rgd->rd_ri.ri_length +
693 num_qd * data_blocks +
694 nalloc * ind_blocks +
695 RES_DINODE + num_qd +
696 RES_STATFS, 0);
697 if (error)
698 goto out_ipres;
699 } else {
700 error = gfs2_trans_begin(sdp,
701 num_qd * data_blocks +
702 RES_DINODE + num_qd, 0);
703 if (error)
704 goto out_gunlock;
705 }
706
707 for (x = 0; x < num_qd; x++) {
708 qd = qda[x];
709 offset = qd2offset(qd);
710 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync,
711 (struct gfs2_quota_data *)
712 qd->qd_gl->gl_lvb);
713 if (error)
714 goto out_end_trans;
715
716 do_qc(qd, -qd->qd_change_sync);
717 }
718
719 error = 0;
720
721 out_end_trans:
722 gfs2_trans_end(sdp);
723 out_ipres:
724 if (nalloc)
725 gfs2_inplace_release(ip);
726 out_alloc:
727 if (nalloc)
728 gfs2_alloc_put(ip);
729 out_gunlock:
730 gfs2_glock_dq_uninit(&i_gh);
731 out:
732 while (qx--)
733 gfs2_glock_dq_uninit(&ghs[qx]);
734 kfree(ghs);
735 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
736 return error;
737 }
738
739 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
740 struct gfs2_holder *q_gh)
741 {
742 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
743 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
744 struct gfs2_holder i_gh;
745 struct gfs2_quota_host q;
746 char buf[sizeof(struct gfs2_quota)];
747 struct file_ra_state ra_state;
748 int error;
749 struct gfs2_quota_lvb *qlvb;
750
751 file_ra_state_init(&ra_state, sdp->sd_quota_inode->i_mapping);
752 restart:
753 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
754 if (error)
755 return error;
756
757 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
758
759 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
760 loff_t pos;
761 gfs2_glock_dq_uninit(q_gh);
762 error = gfs2_glock_nq_init(qd->qd_gl,
763 LM_ST_EXCLUSIVE, GL_NOCACHE,
764 q_gh);
765 if (error)
766 return error;
767
768 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
769 if (error)
770 goto fail;
771
772 memset(buf, 0, sizeof(struct gfs2_quota));
773 pos = qd2offset(qd);
774 error = gfs2_internal_read(ip, &ra_state, buf,
775 &pos, sizeof(struct gfs2_quota));
776 if (error < 0)
777 goto fail_gunlock;
778
779 gfs2_glock_dq_uninit(&i_gh);
780
781
782 gfs2_quota_in(&q, buf);
783 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
784 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
785 qlvb->__pad = 0;
786 qlvb->qb_limit = cpu_to_be64(q.qu_limit);
787 qlvb->qb_warn = cpu_to_be64(q.qu_warn);
788 qlvb->qb_value = cpu_to_be64(q.qu_value);
789 qd->qd_qb = *qlvb;
790
791 if (gfs2_glock_is_blocking(qd->qd_gl)) {
792 gfs2_glock_dq_uninit(q_gh);
793 force_refresh = 0;
794 goto restart;
795 }
796 }
797
798 return 0;
799
800 fail_gunlock:
801 gfs2_glock_dq_uninit(&i_gh);
802 fail:
803 gfs2_glock_dq_uninit(q_gh);
804 return error;
805 }
806
807 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
808 {
809 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
810 struct gfs2_alloc *al = &ip->i_alloc;
811 unsigned int x;
812 int error = 0;
813
814 gfs2_quota_hold(ip, uid, gid);
815
816 if (capable(CAP_SYS_RESOURCE) ||
817 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
818 return 0;
819
820 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
821 sort_qd, NULL);
822
823 for (x = 0; x < al->al_qd_num; x++) {
824 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
825 if (error)
826 break;
827 }
828
829 if (!error)
830 set_bit(GIF_QD_LOCKED, &ip->i_flags);
831 else {
832 while (x--)
833 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
834 gfs2_quota_unhold(ip);
835 }
836
837 return error;
838 }
839
840 static int need_sync(struct gfs2_quota_data *qd)
841 {
842 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
843 struct gfs2_tune *gt = &sdp->sd_tune;
844 s64 value;
845 unsigned int num, den;
846 int do_sync = 1;
847
848 if (!qd->qd_qb.qb_limit)
849 return 0;
850
851 spin_lock(&sdp->sd_quota_spin);
852 value = qd->qd_change;
853 spin_unlock(&sdp->sd_quota_spin);
854
855 spin_lock(&gt->gt_spin);
856 num = gt->gt_quota_scale_num;
857 den = gt->gt_quota_scale_den;
858 spin_unlock(&gt->gt_spin);
859
860 if (value < 0)
861 do_sync = 0;
862 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
863 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
864 do_sync = 0;
865 else {
866 value *= gfs2_jindex_size(sdp) * num;
867 do_div(value, den);
868 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
869 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
870 do_sync = 0;
871 }
872
873 return do_sync;
874 }
875
876 void gfs2_quota_unlock(struct gfs2_inode *ip)
877 {
878 struct gfs2_alloc *al = &ip->i_alloc;
879 struct gfs2_quota_data *qda[4];
880 unsigned int count = 0;
881 unsigned int x;
882
883 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
884 goto out;
885
886 for (x = 0; x < al->al_qd_num; x++) {
887 struct gfs2_quota_data *qd;
888 int sync;
889
890 qd = al->al_qd[x];
891 sync = need_sync(qd);
892
893 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
894
895 if (sync && qd_trylock(qd))
896 qda[count++] = qd;
897 }
898
899 if (count) {
900 do_sync(count, qda);
901 for (x = 0; x < count; x++)
902 qd_unlock(qda[x]);
903 }
904
905 out:
906 gfs2_quota_unhold(ip);
907 }
908
909 #define MAX_LINE 256
910
911 static int print_message(struct gfs2_quota_data *qd, char *type)
912 {
913 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
914
915 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\r\n",
916 sdp->sd_fsname, type,
917 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
918 qd->qd_id);
919
920 return 0;
921 }
922
923 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
924 {
925 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
926 struct gfs2_alloc *al = &ip->i_alloc;
927 struct gfs2_quota_data *qd;
928 s64 value;
929 unsigned int x;
930 int error = 0;
931
932 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
933 return 0;
934
935 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
936 return 0;
937
938 for (x = 0; x < al->al_qd_num; x++) {
939 qd = al->al_qd[x];
940
941 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
942 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))))
943 continue;
944
945 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
946 spin_lock(&sdp->sd_quota_spin);
947 value += qd->qd_change;
948 spin_unlock(&sdp->sd_quota_spin);
949
950 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
951 print_message(qd, "exceeded");
952 error = -EDQUOT;
953 break;
954 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
955 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
956 time_after_eq(jiffies, qd->qd_last_warn +
957 gfs2_tune_get(sdp,
958 gt_quota_warn_period) * HZ)) {
959 error = print_message(qd, "warning");
960 qd->qd_last_warn = jiffies;
961 }
962 }
963
964 return error;
965 }
966
967 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
968 u32 uid, u32 gid)
969 {
970 struct gfs2_alloc *al = &ip->i_alloc;
971 struct gfs2_quota_data *qd;
972 unsigned int x;
973 unsigned int found = 0;
974
975 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
976 return;
977 if (ip->i_di.di_flags & GFS2_DIF_SYSTEM)
978 return;
979
980 for (x = 0; x < al->al_qd_num; x++) {
981 qd = al->al_qd[x];
982
983 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
984 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
985 do_qc(qd, change);
986 found++;
987 }
988 }
989 }
990
991 int gfs2_quota_sync(struct gfs2_sbd *sdp)
992 {
993 struct gfs2_quota_data **qda;
994 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
995 unsigned int num_qd;
996 unsigned int x;
997 int error = 0;
998
999 sdp->sd_quota_sync_gen++;
1000
1001 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1002 if (!qda)
1003 return -ENOMEM;
1004
1005 do {
1006 num_qd = 0;
1007
1008 for (;;) {
1009 error = qd_fish(sdp, qda + num_qd);
1010 if (error || !qda[num_qd])
1011 break;
1012 if (++num_qd == max_qd)
1013 break;
1014 }
1015
1016 if (num_qd) {
1017 if (!error)
1018 error = do_sync(num_qd, qda);
1019 if (!error)
1020 for (x = 0; x < num_qd; x++)
1021 qda[x]->qd_sync_gen =
1022 sdp->sd_quota_sync_gen;
1023
1024 for (x = 0; x < num_qd; x++)
1025 qd_unlock(qda[x]);
1026 }
1027 } while (!error && num_qd == max_qd);
1028
1029 kfree(qda);
1030
1031 return error;
1032 }
1033
1034 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1035 {
1036 struct gfs2_quota_data *qd;
1037 struct gfs2_holder q_gh;
1038 int error;
1039
1040 error = qd_get(sdp, user, id, CREATE, &qd);
1041 if (error)
1042 return error;
1043
1044 error = do_glock(qd, FORCE, &q_gh);
1045 if (!error)
1046 gfs2_glock_dq_uninit(&q_gh);
1047
1048 qd_put(qd);
1049
1050 return error;
1051 }
1052
1053 int gfs2_quota_init(struct gfs2_sbd *sdp)
1054 {
1055 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1056 unsigned int blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
1057 unsigned int x, slot = 0;
1058 unsigned int found = 0;
1059 u64 dblock;
1060 u32 extlen = 0;
1061 int error;
1062
1063 if (!ip->i_di.di_size || ip->i_di.di_size > (64 << 20) ||
1064 ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1)) {
1065 gfs2_consist_inode(ip);
1066 return -EIO;
1067 }
1068 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1069 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1070
1071 error = -ENOMEM;
1072
1073 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1074 sizeof(unsigned char *), GFP_KERNEL);
1075 if (!sdp->sd_quota_bitmap)
1076 return error;
1077
1078 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1079 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_KERNEL);
1080 if (!sdp->sd_quota_bitmap[x])
1081 goto fail;
1082 }
1083
1084 for (x = 0; x < blocks; x++) {
1085 struct buffer_head *bh;
1086 unsigned int y;
1087
1088 if (!extlen) {
1089 int new = 0;
1090 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1091 if (error)
1092 goto fail;
1093 }
1094 error = -EIO;
1095 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1096 if (!bh)
1097 goto fail;
1098 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1099 brelse(bh);
1100 goto fail;
1101 }
1102
1103 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1104 y++, slot++) {
1105 struct gfs2_quota_change_host qc;
1106 struct gfs2_quota_data *qd;
1107
1108 gfs2_quota_change_in(&qc, bh->b_data +
1109 sizeof(struct gfs2_meta_header) +
1110 y * sizeof(struct gfs2_quota_change));
1111 if (!qc.qc_change)
1112 continue;
1113
1114 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1115 qc.qc_id, &qd);
1116 if (error) {
1117 brelse(bh);
1118 goto fail;
1119 }
1120
1121 set_bit(QDF_CHANGE, &qd->qd_flags);
1122 qd->qd_change = qc.qc_change;
1123 qd->qd_slot = slot;
1124 qd->qd_slot_count = 1;
1125 qd->qd_last_touched = jiffies;
1126
1127 spin_lock(&sdp->sd_quota_spin);
1128 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1129 list_add(&qd->qd_list, &sdp->sd_quota_list);
1130 atomic_inc(&sdp->sd_quota_count);
1131 spin_unlock(&sdp->sd_quota_spin);
1132
1133 found++;
1134 }
1135
1136 brelse(bh);
1137 dblock++;
1138 extlen--;
1139 }
1140
1141 if (found)
1142 fs_info(sdp, "found %u quota changes\n", found);
1143
1144 return 0;
1145
1146 fail:
1147 gfs2_quota_cleanup(sdp);
1148 return error;
1149 }
1150
1151 void gfs2_quota_scan(struct gfs2_sbd *sdp)
1152 {
1153 struct gfs2_quota_data *qd, *safe;
1154 LIST_HEAD(dead);
1155
1156 spin_lock(&sdp->sd_quota_spin);
1157 list_for_each_entry_safe(qd, safe, &sdp->sd_quota_list, qd_list) {
1158 if (!qd->qd_count &&
1159 time_after_eq(jiffies, qd->qd_last_touched +
1160 gfs2_tune_get(sdp, gt_quota_cache_secs) * HZ)) {
1161 list_move(&qd->qd_list, &dead);
1162 gfs2_assert_warn(sdp,
1163 atomic_read(&sdp->sd_quota_count) > 0);
1164 atomic_dec(&sdp->sd_quota_count);
1165 }
1166 }
1167 spin_unlock(&sdp->sd_quota_spin);
1168
1169 while (!list_empty(&dead)) {
1170 qd = list_entry(dead.next, struct gfs2_quota_data, qd_list);
1171 list_del(&qd->qd_list);
1172
1173 gfs2_assert_warn(sdp, !qd->qd_change);
1174 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1175 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1176
1177 gfs2_lvb_unhold(qd->qd_gl);
1178 kfree(qd);
1179 }
1180 }
1181
1182 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1183 {
1184 struct list_head *head = &sdp->sd_quota_list;
1185 struct gfs2_quota_data *qd;
1186 unsigned int x;
1187
1188 spin_lock(&sdp->sd_quota_spin);
1189 while (!list_empty(head)) {
1190 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1191
1192 if (qd->qd_count > 1 ||
1193 (qd->qd_count && !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1194 list_move(&qd->qd_list, head);
1195 spin_unlock(&sdp->sd_quota_spin);
1196 schedule();
1197 spin_lock(&sdp->sd_quota_spin);
1198 continue;
1199 }
1200
1201 list_del(&qd->qd_list);
1202 atomic_dec(&sdp->sd_quota_count);
1203 spin_unlock(&sdp->sd_quota_spin);
1204
1205 if (!qd->qd_count) {
1206 gfs2_assert_warn(sdp, !qd->qd_change);
1207 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1208 } else
1209 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1210 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1211
1212 gfs2_lvb_unhold(qd->qd_gl);
1213 kfree(qd);
1214
1215 spin_lock(&sdp->sd_quota_spin);
1216 }
1217 spin_unlock(&sdp->sd_quota_spin);
1218
1219 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1220
1221 if (sdp->sd_quota_bitmap) {
1222 for (x = 0; x < sdp->sd_quota_chunks; x++)
1223 kfree(sdp->sd_quota_bitmap[x]);
1224 kfree(sdp->sd_quota_bitmap);
1225 }
1226 }
1227
WandBoard kernel