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Merge branch 'fix/misc' into for-linus
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / gfs2 / quota.c
blobb08d09696b3e8d92fd8af400cfb819fa196d8229
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 #include <linux/kthread.h>
50 #include <linux/freezer.h>
51
52 #include "gfs2.h"
53 #include "incore.h"
54 #include "bmap.h"
55 #include "glock.h"
56 #include "glops.h"
57 #include "log.h"
58 #include "meta_io.h"
59 #include "quota.h"
60 #include "rgrp.h"
61 #include "super.h"
62 #include "trans.h"
63 #include "inode.h"
64 #include "ops_address.h"
65 #include "util.h"
66
67 #define QUOTA_USER 1
68 #define QUOTA_GROUP 0
69
70 struct gfs2_quota_host {
71 u64 qu_limit;
72 u64 qu_warn;
73 s64 qu_value;
74 u32 qu_ll_next;
75 };
76
77 struct gfs2_quota_change_host {
78 u64 qc_change;
79 u32 qc_flags; /* GFS2_QCF_... */
80 u32 qc_id;
81 };
82
83 static u64 qd2offset(struct gfs2_quota_data *qd)
84 {
85 u64 offset;
86
87 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags);
88 offset *= sizeof(struct gfs2_quota);
89
90 return offset;
91 }
92
93 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id,
94 struct gfs2_quota_data **qdp)
95 {
96 struct gfs2_quota_data *qd;
97 int error;
98
99 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS);
100 if (!qd)
101 return -ENOMEM;
102
103 qd->qd_count = 1;
104 qd->qd_id = id;
105 if (user)
106 set_bit(QDF_USER, &qd->qd_flags);
107 qd->qd_slot = -1;
108
109 error = gfs2_glock_get(sdp, 2 * (u64)id + !user,
110 &gfs2_quota_glops, CREATE, &qd->qd_gl);
111 if (error)
112 goto fail;
113
114 error = gfs2_lvb_hold(qd->qd_gl);
115 gfs2_glock_put(qd->qd_gl);
116 if (error)
117 goto fail;
118
119 *qdp = qd;
120
121 return 0;
122
123 fail:
124 kmem_cache_free(gfs2_quotad_cachep, qd);
125 return error;
126 }
127
128 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
129 struct gfs2_quota_data **qdp)
130 {
131 struct gfs2_quota_data *qd = NULL, *new_qd = NULL;
132 int error, found;
133
134 *qdp = NULL;
135
136 for (;;) {
137 found = 0;
138 spin_lock(&sdp->sd_quota_spin);
139 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
140 if (qd->qd_id == id &&
141 !test_bit(QDF_USER, &qd->qd_flags) == !user) {
142 qd->qd_count++;
143 found = 1;
144 break;
145 }
146 }
147
148 if (!found)
149 qd = NULL;
150
151 if (!qd && new_qd) {
152 qd = new_qd;
153 list_add(&qd->qd_list, &sdp->sd_quota_list);
154 atomic_inc(&sdp->sd_quota_count);
155 new_qd = NULL;
156 }
157
158 spin_unlock(&sdp->sd_quota_spin);
159
160 if (qd || !create) {
161 if (new_qd) {
162 gfs2_lvb_unhold(new_qd->qd_gl);
163 kmem_cache_free(gfs2_quotad_cachep, new_qd);
164 }
165 *qdp = qd;
166 return 0;
167 }
168
169 error = qd_alloc(sdp, user, id, &new_qd);
170 if (error)
171 return error;
172 }
173 }
174
175 static void qd_hold(struct gfs2_quota_data *qd)
176 {
177 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
178
179 spin_lock(&sdp->sd_quota_spin);
180 gfs2_assert(sdp, qd->qd_count);
181 qd->qd_count++;
182 spin_unlock(&sdp->sd_quota_spin);
183 }
184
185 static void qd_put(struct gfs2_quota_data *qd)
186 {
187 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
188 spin_lock(&sdp->sd_quota_spin);
189 gfs2_assert(sdp, qd->qd_count);
190 if (!--qd->qd_count)
191 qd->qd_last_touched = jiffies;
192 spin_unlock(&sdp->sd_quota_spin);
193 }
194
195 static int slot_get(struct gfs2_quota_data *qd)
196 {
197 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
198 unsigned int c, o = 0, b;
199 unsigned char byte = 0;
200
201 spin_lock(&sdp->sd_quota_spin);
202
203 if (qd->qd_slot_count++) {
204 spin_unlock(&sdp->sd_quota_spin);
205 return 0;
206 }
207
208 for (c = 0; c < sdp->sd_quota_chunks; c++)
209 for (o = 0; o < PAGE_SIZE; o++) {
210 byte = sdp->sd_quota_bitmap[c][o];
211 if (byte != 0xFF)
212 goto found;
213 }
214
215 goto fail;
216
217 found:
218 for (b = 0; b < 8; b++)
219 if (!(byte & (1 << b)))
220 break;
221 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b;
222
223 if (qd->qd_slot >= sdp->sd_quota_slots)
224 goto fail;
225
226 sdp->sd_quota_bitmap[c][o] |= 1 << b;
227
228 spin_unlock(&sdp->sd_quota_spin);
229
230 return 0;
231
232 fail:
233 qd->qd_slot_count--;
234 spin_unlock(&sdp->sd_quota_spin);
235 return -ENOSPC;
236 }
237
238 static void slot_hold(struct gfs2_quota_data *qd)
239 {
240 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
241
242 spin_lock(&sdp->sd_quota_spin);
243 gfs2_assert(sdp, qd->qd_slot_count);
244 qd->qd_slot_count++;
245 spin_unlock(&sdp->sd_quota_spin);
246 }
247
248 static void slot_put(struct gfs2_quota_data *qd)
249 {
250 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
251
252 spin_lock(&sdp->sd_quota_spin);
253 gfs2_assert(sdp, qd->qd_slot_count);
254 if (!--qd->qd_slot_count) {
255 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0);
256 qd->qd_slot = -1;
257 }
258 spin_unlock(&sdp->sd_quota_spin);
259 }
260
261 static int bh_get(struct gfs2_quota_data *qd)
262 {
263 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
264 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
265 unsigned int block, offset;
266 struct buffer_head *bh;
267 int error;
268 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
269
270 mutex_lock(&sdp->sd_quota_mutex);
271
272 if (qd->qd_bh_count++) {
273 mutex_unlock(&sdp->sd_quota_mutex);
274 return 0;
275 }
276
277 block = qd->qd_slot / sdp->sd_qc_per_block;
278 offset = qd->qd_slot % sdp->sd_qc_per_block;
279
280 bh_map.b_size = 1 << ip->i_inode.i_blkbits;
281 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0);
282 if (error)
283 goto fail;
284 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh);
285 if (error)
286 goto fail;
287 error = -EIO;
288 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC))
289 goto fail_brelse;
290
291 qd->qd_bh = bh;
292 qd->qd_bh_qc = (struct gfs2_quota_change *)
293 (bh->b_data + sizeof(struct gfs2_meta_header) +
294 offset * sizeof(struct gfs2_quota_change));
295
296 mutex_unlock(&sdp->sd_quota_mutex);
297
298 return 0;
299
300 fail_brelse:
301 brelse(bh);
302 fail:
303 qd->qd_bh_count--;
304 mutex_unlock(&sdp->sd_quota_mutex);
305 return error;
306 }
307
308 static void bh_put(struct gfs2_quota_data *qd)
309 {
310 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
311
312 mutex_lock(&sdp->sd_quota_mutex);
313 gfs2_assert(sdp, qd->qd_bh_count);
314 if (!--qd->qd_bh_count) {
315 brelse(qd->qd_bh);
316 qd->qd_bh = NULL;
317 qd->qd_bh_qc = NULL;
318 }
319 mutex_unlock(&sdp->sd_quota_mutex);
320 }
321
322 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp)
323 {
324 struct gfs2_quota_data *qd = NULL;
325 int error;
326 int found = 0;
327
328 *qdp = NULL;
329
330 if (sdp->sd_vfs->s_flags & MS_RDONLY)
331 return 0;
332
333 spin_lock(&sdp->sd_quota_spin);
334
335 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) {
336 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
337 !test_bit(QDF_CHANGE, &qd->qd_flags) ||
338 qd->qd_sync_gen >= sdp->sd_quota_sync_gen)
339 continue;
340
341 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
342
343 set_bit(QDF_LOCKED, &qd->qd_flags);
344 gfs2_assert_warn(sdp, qd->qd_count);
345 qd->qd_count++;
346 qd->qd_change_sync = qd->qd_change;
347 gfs2_assert_warn(sdp, qd->qd_slot_count);
348 qd->qd_slot_count++;
349 found = 1;
350
351 break;
352 }
353
354 if (!found)
355 qd = NULL;
356
357 spin_unlock(&sdp->sd_quota_spin);
358
359 if (qd) {
360 gfs2_assert_warn(sdp, qd->qd_change_sync);
361 error = bh_get(qd);
362 if (error) {
363 clear_bit(QDF_LOCKED, &qd->qd_flags);
364 slot_put(qd);
365 qd_put(qd);
366 return error;
367 }
368 }
369
370 *qdp = qd;
371
372 return 0;
373 }
374
375 static int qd_trylock(struct gfs2_quota_data *qd)
376 {
377 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
378
379 if (sdp->sd_vfs->s_flags & MS_RDONLY)
380 return 0;
381
382 spin_lock(&sdp->sd_quota_spin);
383
384 if (test_bit(QDF_LOCKED, &qd->qd_flags) ||
385 !test_bit(QDF_CHANGE, &qd->qd_flags)) {
386 spin_unlock(&sdp->sd_quota_spin);
387 return 0;
388 }
389
390 list_move_tail(&qd->qd_list, &sdp->sd_quota_list);
391
392 set_bit(QDF_LOCKED, &qd->qd_flags);
393 gfs2_assert_warn(sdp, qd->qd_count);
394 qd->qd_count++;
395 qd->qd_change_sync = qd->qd_change;
396 gfs2_assert_warn(sdp, qd->qd_slot_count);
397 qd->qd_slot_count++;
398
399 spin_unlock(&sdp->sd_quota_spin);
400
401 gfs2_assert_warn(sdp, qd->qd_change_sync);
402 if (bh_get(qd)) {
403 clear_bit(QDF_LOCKED, &qd->qd_flags);
404 slot_put(qd);
405 qd_put(qd);
406 return 0;
407 }
408
409 return 1;
410 }
411
412 static void qd_unlock(struct gfs2_quota_data *qd)
413 {
414 gfs2_assert_warn(qd->qd_gl->gl_sbd,
415 test_bit(QDF_LOCKED, &qd->qd_flags));
416 clear_bit(QDF_LOCKED, &qd->qd_flags);
417 bh_put(qd);
418 slot_put(qd);
419 qd_put(qd);
420 }
421
422 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id, int create,
423 struct gfs2_quota_data **qdp)
424 {
425 int error;
426
427 error = qd_get(sdp, user, id, create, qdp);
428 if (error)
429 return error;
430
431 error = slot_get(*qdp);
432 if (error)
433 goto fail;
434
435 error = bh_get(*qdp);
436 if (error)
437 goto fail_slot;
438
439 return 0;
440
441 fail_slot:
442 slot_put(*qdp);
443 fail:
444 qd_put(*qdp);
445 return error;
446 }
447
448 static void qdsb_put(struct gfs2_quota_data *qd)
449 {
450 bh_put(qd);
451 slot_put(qd);
452 qd_put(qd);
453 }
454
455 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid)
456 {
457 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
458 struct gfs2_alloc *al = ip->i_alloc;
459 struct gfs2_quota_data **qd = al->al_qd;
460 int error;
461
462 if (gfs2_assert_warn(sdp, !al->al_qd_num) ||
463 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)))
464 return -EIO;
465
466 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
467 return 0;
468
469 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, CREATE, qd);
470 if (error)
471 goto out;
472 al->al_qd_num++;
473 qd++;
474
475 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, CREATE, qd);
476 if (error)
477 goto out;
478 al->al_qd_num++;
479 qd++;
480
481 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) {
482 error = qdsb_get(sdp, QUOTA_USER, uid, CREATE, qd);
483 if (error)
484 goto out;
485 al->al_qd_num++;
486 qd++;
487 }
488
489 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) {
490 error = qdsb_get(sdp, QUOTA_GROUP, gid, CREATE, qd);
491 if (error)
492 goto out;
493 al->al_qd_num++;
494 qd++;
495 }
496
497 out:
498 if (error)
499 gfs2_quota_unhold(ip);
500 return error;
501 }
502
503 void gfs2_quota_unhold(struct gfs2_inode *ip)
504 {
505 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
506 struct gfs2_alloc *al = ip->i_alloc;
507 unsigned int x;
508
509 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags));
510
511 for (x = 0; x < al->al_qd_num; x++) {
512 qdsb_put(al->al_qd[x]);
513 al->al_qd[x] = NULL;
514 }
515 al->al_qd_num = 0;
516 }
517
518 static int sort_qd(const void *a, const void *b)
519 {
520 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a;
521 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b;
522
523 if (!test_bit(QDF_USER, &qd_a->qd_flags) !=
524 !test_bit(QDF_USER, &qd_b->qd_flags)) {
525 if (test_bit(QDF_USER, &qd_a->qd_flags))
526 return -1;
527 else
528 return 1;
529 }
530 if (qd_a->qd_id < qd_b->qd_id)
531 return -1;
532 if (qd_a->qd_id > qd_b->qd_id)
533 return 1;
534
535 return 0;
536 }
537
538 static void do_qc(struct gfs2_quota_data *qd, s64 change)
539 {
540 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
541 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
542 struct gfs2_quota_change *qc = qd->qd_bh_qc;
543 s64 x;
544
545 mutex_lock(&sdp->sd_quota_mutex);
546 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1);
547
548 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) {
549 qc->qc_change = 0;
550 qc->qc_flags = 0;
551 if (test_bit(QDF_USER, &qd->qd_flags))
552 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER);
553 qc->qc_id = cpu_to_be32(qd->qd_id);
554 }
555
556 x = be64_to_cpu(qc->qc_change) + change;
557 qc->qc_change = cpu_to_be64(x);
558
559 spin_lock(&sdp->sd_quota_spin);
560 qd->qd_change = x;
561 spin_unlock(&sdp->sd_quota_spin);
562
563 if (!x) {
564 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags));
565 clear_bit(QDF_CHANGE, &qd->qd_flags);
566 qc->qc_flags = 0;
567 qc->qc_id = 0;
568 slot_put(qd);
569 qd_put(qd);
570 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) {
571 qd_hold(qd);
572 slot_hold(qd);
573 }
574
575 mutex_unlock(&sdp->sd_quota_mutex);
576 }
577
578 static void gfs2_quota_in(struct gfs2_quota_host *qu, const void *buf)
579 {
580 const struct gfs2_quota *str = buf;
581
582 qu->qu_limit = be64_to_cpu(str->qu_limit);
583 qu->qu_warn = be64_to_cpu(str->qu_warn);
584 qu->qu_value = be64_to_cpu(str->qu_value);
585 qu->qu_ll_next = be32_to_cpu(str->qu_ll_next);
586 }
587
588 static void gfs2_quota_out(const struct gfs2_quota_host *qu, void *buf)
589 {
590 struct gfs2_quota *str = buf;
591
592 str->qu_limit = cpu_to_be64(qu->qu_limit);
593 str->qu_warn = cpu_to_be64(qu->qu_warn);
594 str->qu_value = cpu_to_be64(qu->qu_value);
595 str->qu_ll_next = cpu_to_be32(qu->qu_ll_next);
596 memset(&str->qu_reserved, 0, sizeof(str->qu_reserved));
597 }
598
599 /**
600 * gfs2_adjust_quota
601 *
602 * This function was mostly borrowed from gfs2_block_truncate_page which was
603 * in turn mostly borrowed from ext3
604 */
605 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
606 s64 change, struct gfs2_quota_data *qd)
607 {
608 struct inode *inode = &ip->i_inode;
609 struct address_space *mapping = inode->i_mapping;
610 unsigned long index = loc >> PAGE_CACHE_SHIFT;
611 unsigned offset = loc & (PAGE_CACHE_SIZE - 1);
612 unsigned blocksize, iblock, pos;
613 struct buffer_head *bh;
614 struct page *page;
615 void *kaddr;
616 char *ptr;
617 struct gfs2_quota_host qp;
618 s64 value;
619 int err = -EIO;
620
621 if (gfs2_is_stuffed(ip))
622 gfs2_unstuff_dinode(ip, NULL);
623
624 page = grab_cache_page(mapping, index);
625 if (!page)
626 return -ENOMEM;
627
628 blocksize = inode->i_sb->s_blocksize;
629 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits);
630
631 if (!page_has_buffers(page))
632 create_empty_buffers(page, blocksize, 0);
633
634 bh = page_buffers(page);
635 pos = blocksize;
636 while (offset >= pos) {
637 bh = bh->b_this_page;
638 iblock++;
639 pos += blocksize;
640 }
641
642 if (!buffer_mapped(bh)) {
643 gfs2_block_map(inode, iblock, bh, 1);
644 if (!buffer_mapped(bh))
645 goto unlock;
646 }
647
648 if (PageUptodate(page))
649 set_buffer_uptodate(bh);
650
651 if (!buffer_uptodate(bh)) {
652 ll_rw_block(READ_META, 1, &bh);
653 wait_on_buffer(bh);
654 if (!buffer_uptodate(bh))
655 goto unlock;
656 }
657
658 gfs2_trans_add_bh(ip->i_gl, bh, 0);
659
660 kaddr = kmap_atomic(page, KM_USER0);
661 ptr = kaddr + offset;
662 gfs2_quota_in(&qp, ptr);
663 qp.qu_value += change;
664 value = qp.qu_value;
665 gfs2_quota_out(&qp, ptr);
666 flush_dcache_page(page);
667 kunmap_atomic(kaddr, KM_USER0);
668 err = 0;
669 qd->qd_qb.qb_magic = cpu_to_be32(GFS2_MAGIC);
670 qd->qd_qb.qb_value = cpu_to_be64(value);
671 ((struct gfs2_quota_lvb*)(qd->qd_gl->gl_lvb))->qb_magic = cpu_to_be32(GFS2_MAGIC);
672 ((struct gfs2_quota_lvb*)(qd->qd_gl->gl_lvb))->qb_value = cpu_to_be64(value);
673 unlock:
674 unlock_page(page);
675 page_cache_release(page);
676 return err;
677 }
678
679 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
680 {
681 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd;
682 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
683 unsigned int data_blocks, ind_blocks;
684 struct gfs2_holder *ghs, i_gh;
685 unsigned int qx, x;
686 struct gfs2_quota_data *qd;
687 loff_t offset;
688 unsigned int nalloc = 0, blocks;
689 struct gfs2_alloc *al = NULL;
690 int error;
691
692 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota),
693 &data_blocks, &ind_blocks);
694
695 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS);
696 if (!ghs)
697 return -ENOMEM;
698
699 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL);
700 for (qx = 0; qx < num_qd; qx++) {
701 error = gfs2_glock_nq_init(qda[qx]->qd_gl,
702 LM_ST_EXCLUSIVE,
703 GL_NOCACHE, &ghs[qx]);
704 if (error)
705 goto out;
706 }
707
708 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
709 if (error)
710 goto out;
711
712 for (x = 0; x < num_qd; x++) {
713 int alloc_required;
714
715 offset = qd2offset(qda[x]);
716 error = gfs2_write_alloc_required(ip, offset,
717 sizeof(struct gfs2_quota),
718 &alloc_required);
719 if (error)
720 goto out_gunlock;
721 if (alloc_required)
722 nalloc++;
723 }
724
725 al = gfs2_alloc_get(ip);
726 if (!al) {
727 error = -ENOMEM;
728 goto out_gunlock;
729 }
730 /*
731 * 1 blk for unstuffing inode if stuffed. We add this extra
732 * block to the reservation unconditionally. If the inode
733 * doesn't need unstuffing, the block will be released to the
734 * rgrp since it won't be allocated during the transaction
735 */
736 al->al_requested = 1;
737 /* +1 in the end for block requested above for unstuffing */
738 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 1;
739
740 if (nalloc)
741 al->al_requested += nalloc * (data_blocks + ind_blocks);
742 error = gfs2_inplace_reserve(ip);
743 if (error)
744 goto out_alloc;
745
746 if (nalloc)
747 blocks += al->al_rgd->rd_length + nalloc * ind_blocks + RES_STATFS;
748
749 error = gfs2_trans_begin(sdp, blocks, 0);
750 if (error)
751 goto out_ipres;
752
753 for (x = 0; x < num_qd; x++) {
754 qd = qda[x];
755 offset = qd2offset(qd);
756 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync,
757 (struct gfs2_quota_data *)
758 qd);
759 if (error)
760 goto out_end_trans;
761
762 do_qc(qd, -qd->qd_change_sync);
763 }
764
765 error = 0;
766
767 out_end_trans:
768 gfs2_trans_end(sdp);
769 out_ipres:
770 gfs2_inplace_release(ip);
771 out_alloc:
772 gfs2_alloc_put(ip);
773 out_gunlock:
774 gfs2_glock_dq_uninit(&i_gh);
775 out:
776 while (qx--)
777 gfs2_glock_dq_uninit(&ghs[qx]);
778 kfree(ghs);
779 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl);
780 return error;
781 }
782
783 static int do_glock(struct gfs2_quota_data *qd, int force_refresh,
784 struct gfs2_holder *q_gh)
785 {
786 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
787 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode);
788 struct gfs2_holder i_gh;
789 struct gfs2_quota_host q;
790 char buf[sizeof(struct gfs2_quota)];
791 int error;
792 struct gfs2_quota_lvb *qlvb;
793
794 restart:
795 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh);
796 if (error)
797 return error;
798
799 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
800
801 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) {
802 loff_t pos;
803 gfs2_glock_dq_uninit(q_gh);
804 error = gfs2_glock_nq_init(qd->qd_gl,
805 LM_ST_EXCLUSIVE, GL_NOCACHE,
806 q_gh);
807 if (error)
808 return error;
809
810 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
811 if (error)
812 goto fail;
813
814 memset(buf, 0, sizeof(struct gfs2_quota));
815 pos = qd2offset(qd);
816 error = gfs2_internal_read(ip, NULL, buf, &pos,
817 sizeof(struct gfs2_quota));
818 if (error < 0)
819 goto fail_gunlock;
820
821 gfs2_glock_dq_uninit(&i_gh);
822
823
824 gfs2_quota_in(&q, buf);
825 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb;
826 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC);
827 qlvb->__pad = 0;
828 qlvb->qb_limit = cpu_to_be64(q.qu_limit);
829 qlvb->qb_warn = cpu_to_be64(q.qu_warn);
830 qlvb->qb_value = cpu_to_be64(q.qu_value);
831 qd->qd_qb = *qlvb;
832
833 if (gfs2_glock_is_blocking(qd->qd_gl)) {
834 gfs2_glock_dq_uninit(q_gh);
835 force_refresh = 0;
836 goto restart;
837 }
838 }
839
840 return 0;
841
842 fail_gunlock:
843 gfs2_glock_dq_uninit(&i_gh);
844 fail:
845 gfs2_glock_dq_uninit(q_gh);
846 return error;
847 }
848
849 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid)
850 {
851 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
852 struct gfs2_alloc *al = ip->i_alloc;
853 unsigned int x;
854 int error = 0;
855
856 gfs2_quota_hold(ip, uid, gid);
857
858 if (capable(CAP_SYS_RESOURCE) ||
859 sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
860 return 0;
861
862 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *),
863 sort_qd, NULL);
864
865 for (x = 0; x < al->al_qd_num; x++) {
866 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]);
867 if (error)
868 break;
869 }
870
871 if (!error)
872 set_bit(GIF_QD_LOCKED, &ip->i_flags);
873 else {
874 while (x--)
875 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
876 gfs2_quota_unhold(ip);
877 }
878
879 return error;
880 }
881
882 static int need_sync(struct gfs2_quota_data *qd)
883 {
884 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
885 struct gfs2_tune *gt = &sdp->sd_tune;
886 s64 value;
887 unsigned int num, den;
888 int do_sync = 1;
889
890 if (!qd->qd_qb.qb_limit)
891 return 0;
892
893 spin_lock(&sdp->sd_quota_spin);
894 value = qd->qd_change;
895 spin_unlock(&sdp->sd_quota_spin);
896
897 spin_lock(&gt->gt_spin);
898 num = gt->gt_quota_scale_num;
899 den = gt->gt_quota_scale_den;
900 spin_unlock(&gt->gt_spin);
901
902 if (value < 0)
903 do_sync = 0;
904 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >=
905 (s64)be64_to_cpu(qd->qd_qb.qb_limit))
906 do_sync = 0;
907 else {
908 value *= gfs2_jindex_size(sdp) * num;
909 value = div_s64(value, den);
910 value += (s64)be64_to_cpu(qd->qd_qb.qb_value);
911 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit))
912 do_sync = 0;
913 }
914
915 return do_sync;
916 }
917
918 void gfs2_quota_unlock(struct gfs2_inode *ip)
919 {
920 struct gfs2_alloc *al = ip->i_alloc;
921 struct gfs2_quota_data *qda[4];
922 unsigned int count = 0;
923 unsigned int x;
924
925 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags))
926 goto out;
927
928 for (x = 0; x < al->al_qd_num; x++) {
929 struct gfs2_quota_data *qd;
930 int sync;
931
932 qd = al->al_qd[x];
933 sync = need_sync(qd);
934
935 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]);
936
937 if (sync && qd_trylock(qd))
938 qda[count++] = qd;
939 }
940
941 if (count) {
942 do_sync(count, qda);
943 for (x = 0; x < count; x++)
944 qd_unlock(qda[x]);
945 }
946
947 out:
948 gfs2_quota_unhold(ip);
949 }
950
951 #define MAX_LINE 256
952
953 static int print_message(struct gfs2_quota_data *qd, char *type)
954 {
955 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd;
956
957 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\r\n",
958 sdp->sd_fsname, type,
959 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group",
960 qd->qd_id);
961
962 return 0;
963 }
964
965 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid)
966 {
967 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
968 struct gfs2_alloc *al = ip->i_alloc;
969 struct gfs2_quota_data *qd;
970 s64 value;
971 unsigned int x;
972 int error = 0;
973
974 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags))
975 return 0;
976
977 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
978 return 0;
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 continue;
986
987 value = (s64)be64_to_cpu(qd->qd_qb.qb_value);
988 spin_lock(&sdp->sd_quota_spin);
989 value += qd->qd_change;
990 spin_unlock(&sdp->sd_quota_spin);
991
992 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) {
993 print_message(qd, "exceeded");
994 error = -EDQUOT;
995 break;
996 } else if (be64_to_cpu(qd->qd_qb.qb_warn) &&
997 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value &&
998 time_after_eq(jiffies, qd->qd_last_warn +
999 gfs2_tune_get(sdp,
1000 gt_quota_warn_period) * HZ)) {
1001 error = print_message(qd, "warning");
1002 qd->qd_last_warn = jiffies;
1003 }
1004 }
1005
1006 return error;
1007 }
1008
1009 void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
1010 u32 uid, u32 gid)
1011 {
1012 struct gfs2_alloc *al = ip->i_alloc;
1013 struct gfs2_quota_data *qd;
1014 unsigned int x;
1015
1016 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change))
1017 return;
1018 if (ip->i_diskflags & GFS2_DIF_SYSTEM)
1019 return;
1020
1021 for (x = 0; x < al->al_qd_num; x++) {
1022 qd = al->al_qd[x];
1023
1024 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) ||
1025 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) {
1026 do_qc(qd, change);
1027 }
1028 }
1029 }
1030
1031 int gfs2_quota_sync(struct gfs2_sbd *sdp)
1032 {
1033 struct gfs2_quota_data **qda;
1034 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync);
1035 unsigned int num_qd;
1036 unsigned int x;
1037 int error = 0;
1038
1039 sdp->sd_quota_sync_gen++;
1040
1041 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL);
1042 if (!qda)
1043 return -ENOMEM;
1044
1045 do {
1046 num_qd = 0;
1047
1048 for (;;) {
1049 error = qd_fish(sdp, qda + num_qd);
1050 if (error || !qda[num_qd])
1051 break;
1052 if (++num_qd == max_qd)
1053 break;
1054 }
1055
1056 if (num_qd) {
1057 if (!error)
1058 error = do_sync(num_qd, qda);
1059 if (!error)
1060 for (x = 0; x < num_qd; x++)
1061 qda[x]->qd_sync_gen =
1062 sdp->sd_quota_sync_gen;
1063
1064 for (x = 0; x < num_qd; x++)
1065 qd_unlock(qda[x]);
1066 }
1067 } while (!error && num_qd == max_qd);
1068
1069 kfree(qda);
1070
1071 return error;
1072 }
1073
1074 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id)
1075 {
1076 struct gfs2_quota_data *qd;
1077 struct gfs2_holder q_gh;
1078 int error;
1079
1080 error = qd_get(sdp, user, id, CREATE, &qd);
1081 if (error)
1082 return error;
1083
1084 error = do_glock(qd, FORCE, &q_gh);
1085 if (!error)
1086 gfs2_glock_dq_uninit(&q_gh);
1087
1088 qd_put(qd);
1089
1090 return error;
1091 }
1092
1093 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf)
1094 {
1095 const struct gfs2_quota_change *str = buf;
1096
1097 qc->qc_change = be64_to_cpu(str->qc_change);
1098 qc->qc_flags = be32_to_cpu(str->qc_flags);
1099 qc->qc_id = be32_to_cpu(str->qc_id);
1100 }
1101
1102 int gfs2_quota_init(struct gfs2_sbd *sdp)
1103 {
1104 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode);
1105 unsigned int blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
1106 unsigned int x, slot = 0;
1107 unsigned int found = 0;
1108 u64 dblock;
1109 u32 extlen = 0;
1110 int error;
1111
1112 if (!ip->i_disksize || ip->i_disksize > (64 << 20) ||
1113 ip->i_disksize & (sdp->sd_sb.sb_bsize - 1)) {
1114 gfs2_consist_inode(ip);
1115 return -EIO;
1116 }
1117 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block;
1118 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE);
1119
1120 error = -ENOMEM;
1121
1122 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks,
1123 sizeof(unsigned char *), GFP_NOFS);
1124 if (!sdp->sd_quota_bitmap)
1125 return error;
1126
1127 for (x = 0; x < sdp->sd_quota_chunks; x++) {
1128 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS);
1129 if (!sdp->sd_quota_bitmap[x])
1130 goto fail;
1131 }
1132
1133 for (x = 0; x < blocks; x++) {
1134 struct buffer_head *bh;
1135 unsigned int y;
1136
1137 if (!extlen) {
1138 int new = 0;
1139 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen);
1140 if (error)
1141 goto fail;
1142 }
1143 error = -EIO;
1144 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen);
1145 if (!bh)
1146 goto fail;
1147 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) {
1148 brelse(bh);
1149 goto fail;
1150 }
1151
1152 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots;
1153 y++, slot++) {
1154 struct gfs2_quota_change_host qc;
1155 struct gfs2_quota_data *qd;
1156
1157 gfs2_quota_change_in(&qc, bh->b_data +
1158 sizeof(struct gfs2_meta_header) +
1159 y * sizeof(struct gfs2_quota_change));
1160 if (!qc.qc_change)
1161 continue;
1162
1163 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER),
1164 qc.qc_id, &qd);
1165 if (error) {
1166 brelse(bh);
1167 goto fail;
1168 }
1169
1170 set_bit(QDF_CHANGE, &qd->qd_flags);
1171 qd->qd_change = qc.qc_change;
1172 qd->qd_slot = slot;
1173 qd->qd_slot_count = 1;
1174 qd->qd_last_touched = jiffies;
1175
1176 spin_lock(&sdp->sd_quota_spin);
1177 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1);
1178 list_add(&qd->qd_list, &sdp->sd_quota_list);
1179 atomic_inc(&sdp->sd_quota_count);
1180 spin_unlock(&sdp->sd_quota_spin);
1181
1182 found++;
1183 }
1184
1185 brelse(bh);
1186 dblock++;
1187 extlen--;
1188 }
1189
1190 if (found)
1191 fs_info(sdp, "found %u quota changes\n", found);
1192
1193 return 0;
1194
1195 fail:
1196 gfs2_quota_cleanup(sdp);
1197 return error;
1198 }
1199
1200 static void gfs2_quota_scan(struct gfs2_sbd *sdp)
1201 {
1202 struct gfs2_quota_data *qd, *safe;
1203 LIST_HEAD(dead);
1204
1205 spin_lock(&sdp->sd_quota_spin);
1206 list_for_each_entry_safe(qd, safe, &sdp->sd_quota_list, qd_list) {
1207 if (!qd->qd_count &&
1208 time_after_eq(jiffies, qd->qd_last_touched +
1209 gfs2_tune_get(sdp, gt_quota_cache_secs) * HZ)) {
1210 list_move(&qd->qd_list, &dead);
1211 gfs2_assert_warn(sdp,
1212 atomic_read(&sdp->sd_quota_count) > 0);
1213 atomic_dec(&sdp->sd_quota_count);
1214 }
1215 }
1216 spin_unlock(&sdp->sd_quota_spin);
1217
1218 while (!list_empty(&dead)) {
1219 qd = list_entry(dead.next, struct gfs2_quota_data, qd_list);
1220 list_del(&qd->qd_list);
1221
1222 gfs2_assert_warn(sdp, !qd->qd_change);
1223 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1224 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1225
1226 gfs2_lvb_unhold(qd->qd_gl);
1227 kmem_cache_free(gfs2_quotad_cachep, qd);
1228 }
1229 }
1230
1231 void gfs2_quota_cleanup(struct gfs2_sbd *sdp)
1232 {
1233 struct list_head *head = &sdp->sd_quota_list;
1234 struct gfs2_quota_data *qd;
1235 unsigned int x;
1236
1237 spin_lock(&sdp->sd_quota_spin);
1238 while (!list_empty(head)) {
1239 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list);
1240
1241 if (qd->qd_count > 1 ||
1242 (qd->qd_count && !test_bit(QDF_CHANGE, &qd->qd_flags))) {
1243 list_move(&qd->qd_list, head);
1244 spin_unlock(&sdp->sd_quota_spin);
1245 schedule();
1246 spin_lock(&sdp->sd_quota_spin);
1247 continue;
1248 }
1249
1250 list_del(&qd->qd_list);
1251 atomic_dec(&sdp->sd_quota_count);
1252 spin_unlock(&sdp->sd_quota_spin);
1253
1254 if (!qd->qd_count) {
1255 gfs2_assert_warn(sdp, !qd->qd_change);
1256 gfs2_assert_warn(sdp, !qd->qd_slot_count);
1257 } else
1258 gfs2_assert_warn(sdp, qd->qd_slot_count == 1);
1259 gfs2_assert_warn(sdp, !qd->qd_bh_count);
1260
1261 gfs2_lvb_unhold(qd->qd_gl);
1262 kmem_cache_free(gfs2_quotad_cachep, qd);
1263
1264 spin_lock(&sdp->sd_quota_spin);
1265 }
1266 spin_unlock(&sdp->sd_quota_spin);
1267
1268 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count));
1269
1270 if (sdp->sd_quota_bitmap) {
1271 for (x = 0; x < sdp->sd_quota_chunks; x++)
1272 kfree(sdp->sd_quota_bitmap[x]);
1273 kfree(sdp->sd_quota_bitmap);
1274 }
1275 }
1276
1277 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error)
1278 {
1279 if (error == 0 || error == -EROFS)
1280 return;
1281 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
1282 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error);
1283 }
1284
1285 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg,
1286 int (*fxn)(struct gfs2_sbd *sdp),
1287 unsigned long t, unsigned long *timeo,
1288 unsigned int *new_timeo)
1289 {
1290 if (t >= *timeo) {
1291 int error = fxn(sdp);
1292 quotad_error(sdp, msg, error);
1293 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ;
1294 } else {
1295 *timeo -= t;
1296 }
1297 }
1298
1299 static void quotad_check_trunc_list(struct gfs2_sbd *sdp)
1300 {
1301 struct gfs2_inode *ip;
1302
1303 while(1) {
1304 ip = NULL;
1305 spin_lock(&sdp->sd_trunc_lock);
1306 if (!list_empty(&sdp->sd_trunc_list)) {
1307 ip = list_entry(sdp->sd_trunc_list.next,
1308 struct gfs2_inode, i_trunc_list);
1309 list_del_init(&ip->i_trunc_list);
1310 }
1311 spin_unlock(&sdp->sd_trunc_lock);
1312 if (ip == NULL)
1313 return;
1314 gfs2_glock_finish_truncate(ip);
1315 }
1316 }
1317
1318 /**
1319 * gfs2_quotad - Write cached quota changes into the quota file
1320 * @sdp: Pointer to GFS2 superblock
1321 *
1322 */
1323
1324 int gfs2_quotad(void *data)
1325 {
1326 struct gfs2_sbd *sdp = data;
1327 struct gfs2_tune *tune = &sdp->sd_tune;
1328 unsigned long statfs_timeo = 0;
1329 unsigned long quotad_timeo = 0;
1330 unsigned long t = 0;
1331 DEFINE_WAIT(wait);
1332 int empty;
1333
1334 while (!kthread_should_stop()) {
1335
1336 /* Update the master statfs file */
1337 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t,
1338 &statfs_timeo, &tune->gt_statfs_quantum);
1339
1340 /* Update quota file */
1341 quotad_check_timeo(sdp, "sync", gfs2_quota_sync, t,
1342 &quotad_timeo, &tune->gt_quota_quantum);
1343
1344 /* FIXME: This should be turned into a shrinker */
1345 gfs2_quota_scan(sdp);
1346
1347 /* Check for & recover partially truncated inodes */
1348 quotad_check_trunc_list(sdp);
1349
1350 if (freezing(current))
1351 refrigerator();
1352 t = min(quotad_timeo, statfs_timeo);
1353
1354 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_UNINTERRUPTIBLE);
1355 spin_lock(&sdp->sd_trunc_lock);
1356 empty = list_empty(&sdp->sd_trunc_list);
1357 spin_unlock(&sdp->sd_trunc_lock);
1358 if (empty)
1359 t -= schedule_timeout(t);
1360 else
1361 t = 0;
1362 finish_wait(&sdp->sd_quota_wait, &wait);
1363 }
1364
1365 return 0;
1366 }
1367
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree