1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 /* 11 * Quota change tags are associated with each transaction that allocates or 12 * deallocates space. Those changes are accumulated locally to each node (in a 13 * per-node file) and then are periodically synced to the quota file. This 14 * avoids the bottleneck of constantly touching the quota file, but introduces 15 * fuzziness in the current usage value of IDs that are being used on different 16 * nodes in the cluster simultaneously. So, it is possible for a user on 17 * multiple nodes to overrun their quota, but that overrun is controlable. 18 * Since quota tags are part of transactions, there is no need for a quota check 19 * program to be run on node crashes or anything like that. 20 * 21 * There are couple of knobs that let the administrator manage the quota 22 * fuzziness. "quota_quantum" sets the maximum time a quota change can be 23 * sitting on one node before being synced to the quota file. (The default is 24 * 60 seconds.) Another knob, "quota_scale" controls how quickly the frequency 25 * of quota file syncs increases as the user moves closer to their limit. The 26 * more frequent the syncs, the more accurate the quota enforcement, but that 27 * means that there is more contention between the nodes for the quota file. 28 * The default value is one. This sets the maximum theoretical quota overrun 29 * (with infinite node with infinite bandwidth) to twice the user's limit. (In 30 * practice, the maximum overrun you see should be much less.) A "quota_scale" 31 * number greater than one makes quota syncs more frequent and reduces the 32 * maximum overrun. Numbers less than one (but greater than zero) make quota 33 * syncs less frequent. 34 * 35 * GFS quotas also use per-ID Lock Value Blocks (LVBs) to cache the contents of 36 * the quota file, so it is not being constantly read. 37 */ 38 39 #include <linux/sched.h> 40 #include <linux/slab.h> 41 #include <linux/mm.h> 42 #include <linux/spinlock.h> 43 #include <linux/completion.h> 44 #include <linux/buffer_head.h> 45 #include <linux/sort.h> 46 #include <linux/fs.h> 47 #include <linux/bio.h> 48 #include <linux/gfs2_ondisk.h> 49 #include <linux/kthread.h> 50 #include <linux/freezer.h> 51 #include <linux/quota.h> 52 #include <linux/dqblk_xfs.h> 53 54 #include "gfs2.h" 55 #include "incore.h" 56 #include "bmap.h" 57 #include "glock.h" 58 #include "glops.h" 59 #include "log.h" 60 #include "meta_io.h" 61 #include "quota.h" 62 #include "rgrp.h" 63 #include "super.h" 64 #include "trans.h" 65 #include "inode.h" 66 #include "util.h" 67 68 #define QUOTA_USER 1 69 #define QUOTA_GROUP 0 70 71 struct gfs2_quota_change_host { 72 u64 qc_change; 73 u32 qc_flags; /* GFS2_QCF_... */ 74 u32 qc_id; 75 }; 76 77 static LIST_HEAD(qd_lru_list); 78 static atomic_t qd_lru_count = ATOMIC_INIT(0); 79 static DEFINE_SPINLOCK(qd_lru_lock); 80 81 int gfs2_shrink_qd_memory(struct shrinker *shrink, struct shrink_control *sc) 82 { 83 struct gfs2_quota_data *qd; 84 struct gfs2_sbd *sdp; 85 int nr_to_scan = sc->nr_to_scan; 86 87 if (nr_to_scan == 0) 88 goto out; 89 90 if (!(sc->gfp_mask & __GFP_FS)) 91 return -1; 92 93 spin_lock(&qd_lru_lock); 94 while (nr_to_scan && !list_empty(&qd_lru_list)) { 95 qd = list_entry(qd_lru_list.next, 96 struct gfs2_quota_data, qd_reclaim); 97 sdp = qd->qd_gl->gl_sbd; 98 99 /* Free from the filesystem-specific list */ 100 list_del(&qd->qd_list); 101 102 gfs2_assert_warn(sdp, !qd->qd_change); 103 gfs2_assert_warn(sdp, !qd->qd_slot_count); 104 gfs2_assert_warn(sdp, !qd->qd_bh_count); 105 106 gfs2_glock_put(qd->qd_gl); 107 atomic_dec(&sdp->sd_quota_count); 108 109 /* Delete it from the common reclaim list */ 110 list_del_init(&qd->qd_reclaim); 111 atomic_dec(&qd_lru_count); 112 spin_unlock(&qd_lru_lock); 113 kmem_cache_free(gfs2_quotad_cachep, qd); 114 spin_lock(&qd_lru_lock); 115 nr_to_scan--; 116 } 117 spin_unlock(&qd_lru_lock); 118 119 out: 120 return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100; 121 } 122 123 static u64 qd2offset(struct gfs2_quota_data *qd) 124 { 125 u64 offset; 126 127 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags); 128 offset *= sizeof(struct gfs2_quota); 129 130 return offset; 131 } 132 133 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id, 134 struct gfs2_quota_data **qdp) 135 { 136 struct gfs2_quota_data *qd; 137 int error; 138 139 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS); 140 if (!qd) 141 return -ENOMEM; 142 143 atomic_set(&qd->qd_count, 1); 144 qd->qd_id = id; 145 if (user) 146 set_bit(QDF_USER, &qd->qd_flags); 147 qd->qd_slot = -1; 148 INIT_LIST_HEAD(&qd->qd_reclaim); 149 150 error = gfs2_glock_get(sdp, 2 * (u64)id + !user, 151 &gfs2_quota_glops, CREATE, &qd->qd_gl); 152 if (error) 153 goto fail; 154 155 *qdp = qd; 156 157 return 0; 158 159 fail: 160 kmem_cache_free(gfs2_quotad_cachep, qd); 161 return error; 162 } 163 164 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, 165 struct gfs2_quota_data **qdp) 166 { 167 struct gfs2_quota_data *qd = NULL, *new_qd = NULL; 168 int error, found; 169 170 *qdp = NULL; 171 172 for (;;) { 173 found = 0; 174 spin_lock(&qd_lru_lock); 175 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { 176 if (qd->qd_id == id && 177 !test_bit(QDF_USER, &qd->qd_flags) == !user) { 178 if (!atomic_read(&qd->qd_count) && 179 !list_empty(&qd->qd_reclaim)) { 180 /* Remove it from reclaim list */ 181 list_del_init(&qd->qd_reclaim); 182 atomic_dec(&qd_lru_count); 183 } 184 atomic_inc(&qd->qd_count); 185 found = 1; 186 break; 187 } 188 } 189 190 if (!found) 191 qd = NULL; 192 193 if (!qd && new_qd) { 194 qd = new_qd; 195 list_add(&qd->qd_list, &sdp->sd_quota_list); 196 atomic_inc(&sdp->sd_quota_count); 197 new_qd = NULL; 198 } 199 200 spin_unlock(&qd_lru_lock); 201 202 if (qd) { 203 if (new_qd) { 204 gfs2_glock_put(new_qd->qd_gl); 205 kmem_cache_free(gfs2_quotad_cachep, new_qd); 206 } 207 *qdp = qd; 208 return 0; 209 } 210 211 error = qd_alloc(sdp, user, id, &new_qd); 212 if (error) 213 return error; 214 } 215 } 216 217 static void qd_hold(struct gfs2_quota_data *qd) 218 { 219 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 220 gfs2_assert(sdp, atomic_read(&qd->qd_count)); 221 atomic_inc(&qd->qd_count); 222 } 223 224 static void qd_put(struct gfs2_quota_data *qd) 225 { 226 if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) { 227 /* Add to the reclaim list */ 228 list_add_tail(&qd->qd_reclaim, &qd_lru_list); 229 atomic_inc(&qd_lru_count); 230 spin_unlock(&qd_lru_lock); 231 } 232 } 233 234 static int slot_get(struct gfs2_quota_data *qd) 235 { 236 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 237 unsigned int c, o = 0, b; 238 unsigned char byte = 0; 239 240 spin_lock(&qd_lru_lock); 241 242 if (qd->qd_slot_count++) { 243 spin_unlock(&qd_lru_lock); 244 return 0; 245 } 246 247 for (c = 0; c < sdp->sd_quota_chunks; c++) 248 for (o = 0; o < PAGE_SIZE; o++) { 249 byte = sdp->sd_quota_bitmap[c][o]; 250 if (byte != 0xFF) 251 goto found; 252 } 253 254 goto fail; 255 256 found: 257 for (b = 0; b < 8; b++) 258 if (!(byte & (1 << b))) 259 break; 260 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b; 261 262 if (qd->qd_slot >= sdp->sd_quota_slots) 263 goto fail; 264 265 sdp->sd_quota_bitmap[c][o] |= 1 << b; 266 267 spin_unlock(&qd_lru_lock); 268 269 return 0; 270 271 fail: 272 qd->qd_slot_count--; 273 spin_unlock(&qd_lru_lock); 274 return -ENOSPC; 275 } 276 277 static void slot_hold(struct gfs2_quota_data *qd) 278 { 279 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 280 281 spin_lock(&qd_lru_lock); 282 gfs2_assert(sdp, qd->qd_slot_count); 283 qd->qd_slot_count++; 284 spin_unlock(&qd_lru_lock); 285 } 286 287 static void slot_put(struct gfs2_quota_data *qd) 288 { 289 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 290 291 spin_lock(&qd_lru_lock); 292 gfs2_assert(sdp, qd->qd_slot_count); 293 if (!--qd->qd_slot_count) { 294 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0); 295 qd->qd_slot = -1; 296 } 297 spin_unlock(&qd_lru_lock); 298 } 299 300 static int bh_get(struct gfs2_quota_data *qd) 301 { 302 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 303 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 304 unsigned int block, offset; 305 struct buffer_head *bh; 306 int error; 307 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; 308 309 mutex_lock(&sdp->sd_quota_mutex); 310 311 if (qd->qd_bh_count++) { 312 mutex_unlock(&sdp->sd_quota_mutex); 313 return 0; 314 } 315 316 block = qd->qd_slot / sdp->sd_qc_per_block; 317 offset = qd->qd_slot % sdp->sd_qc_per_block; 318 319 bh_map.b_size = 1 << ip->i_inode.i_blkbits; 320 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0); 321 if (error) 322 goto fail; 323 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh); 324 if (error) 325 goto fail; 326 error = -EIO; 327 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) 328 goto fail_brelse; 329 330 qd->qd_bh = bh; 331 qd->qd_bh_qc = (struct gfs2_quota_change *) 332 (bh->b_data + sizeof(struct gfs2_meta_header) + 333 offset * sizeof(struct gfs2_quota_change)); 334 335 mutex_unlock(&sdp->sd_quota_mutex); 336 337 return 0; 338 339 fail_brelse: 340 brelse(bh); 341 fail: 342 qd->qd_bh_count--; 343 mutex_unlock(&sdp->sd_quota_mutex); 344 return error; 345 } 346 347 static void bh_put(struct gfs2_quota_data *qd) 348 { 349 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 350 351 mutex_lock(&sdp->sd_quota_mutex); 352 gfs2_assert(sdp, qd->qd_bh_count); 353 if (!--qd->qd_bh_count) { 354 brelse(qd->qd_bh); 355 qd->qd_bh = NULL; 356 qd->qd_bh_qc = NULL; 357 } 358 mutex_unlock(&sdp->sd_quota_mutex); 359 } 360 361 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp) 362 { 363 struct gfs2_quota_data *qd = NULL; 364 int error; 365 int found = 0; 366 367 *qdp = NULL; 368 369 if (sdp->sd_vfs->s_flags & MS_RDONLY) 370 return 0; 371 372 spin_lock(&qd_lru_lock); 373 374 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { 375 if (test_bit(QDF_LOCKED, &qd->qd_flags) || 376 !test_bit(QDF_CHANGE, &qd->qd_flags) || 377 qd->qd_sync_gen >= sdp->sd_quota_sync_gen) 378 continue; 379 380 list_move_tail(&qd->qd_list, &sdp->sd_quota_list); 381 382 set_bit(QDF_LOCKED, &qd->qd_flags); 383 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count)); 384 atomic_inc(&qd->qd_count); 385 qd->qd_change_sync = qd->qd_change; 386 gfs2_assert_warn(sdp, qd->qd_slot_count); 387 qd->qd_slot_count++; 388 found = 1; 389 390 break; 391 } 392 393 if (!found) 394 qd = NULL; 395 396 spin_unlock(&qd_lru_lock); 397 398 if (qd) { 399 gfs2_assert_warn(sdp, qd->qd_change_sync); 400 error = bh_get(qd); 401 if (error) { 402 clear_bit(QDF_LOCKED, &qd->qd_flags); 403 slot_put(qd); 404 qd_put(qd); 405 return error; 406 } 407 } 408 409 *qdp = qd; 410 411 return 0; 412 } 413 414 static int qd_trylock(struct gfs2_quota_data *qd) 415 { 416 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 417 418 if (sdp->sd_vfs->s_flags & MS_RDONLY) 419 return 0; 420 421 spin_lock(&qd_lru_lock); 422 423 if (test_bit(QDF_LOCKED, &qd->qd_flags) || 424 !test_bit(QDF_CHANGE, &qd->qd_flags)) { 425 spin_unlock(&qd_lru_lock); 426 return 0; 427 } 428 429 list_move_tail(&qd->qd_list, &sdp->sd_quota_list); 430 431 set_bit(QDF_LOCKED, &qd->qd_flags); 432 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count)); 433 atomic_inc(&qd->qd_count); 434 qd->qd_change_sync = qd->qd_change; 435 gfs2_assert_warn(sdp, qd->qd_slot_count); 436 qd->qd_slot_count++; 437 438 spin_unlock(&qd_lru_lock); 439 440 gfs2_assert_warn(sdp, qd->qd_change_sync); 441 if (bh_get(qd)) { 442 clear_bit(QDF_LOCKED, &qd->qd_flags); 443 slot_put(qd); 444 qd_put(qd); 445 return 0; 446 } 447 448 return 1; 449 } 450 451 static void qd_unlock(struct gfs2_quota_data *qd) 452 { 453 gfs2_assert_warn(qd->qd_gl->gl_sbd, 454 test_bit(QDF_LOCKED, &qd->qd_flags)); 455 clear_bit(QDF_LOCKED, &qd->qd_flags); 456 bh_put(qd); 457 slot_put(qd); 458 qd_put(qd); 459 } 460 461 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id, 462 struct gfs2_quota_data **qdp) 463 { 464 int error; 465 466 error = qd_get(sdp, user, id, qdp); 467 if (error) 468 return error; 469 470 error = slot_get(*qdp); 471 if (error) 472 goto fail; 473 474 error = bh_get(*qdp); 475 if (error) 476 goto fail_slot; 477 478 return 0; 479 480 fail_slot: 481 slot_put(*qdp); 482 fail: 483 qd_put(*qdp); 484 return error; 485 } 486 487 static void qdsb_put(struct gfs2_quota_data *qd) 488 { 489 bh_put(qd); 490 slot_put(qd); 491 qd_put(qd); 492 } 493 494 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid) 495 { 496 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 497 struct gfs2_quota_data **qd; 498 int error; 499 500 if (ip->i_res == NULL) { 501 error = gfs2_rs_alloc(ip); 502 if (error) 503 return error; 504 } 505 506 qd = ip->i_res->rs_qa_qd; 507 508 if (gfs2_assert_warn(sdp, !ip->i_res->rs_qa_qd_num) || 509 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) 510 return -EIO; 511 512 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 513 return 0; 514 515 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd); 516 if (error) 517 goto out; 518 ip->i_res->rs_qa_qd_num++; 519 qd++; 520 521 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd); 522 if (error) 523 goto out; 524 ip->i_res->rs_qa_qd_num++; 525 qd++; 526 527 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) { 528 error = qdsb_get(sdp, QUOTA_USER, uid, qd); 529 if (error) 530 goto out; 531 ip->i_res->rs_qa_qd_num++; 532 qd++; 533 } 534 535 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) { 536 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd); 537 if (error) 538 goto out; 539 ip->i_res->rs_qa_qd_num++; 540 qd++; 541 } 542 543 out: 544 if (error) 545 gfs2_quota_unhold(ip); 546 return error; 547 } 548 549 void gfs2_quota_unhold(struct gfs2_inode *ip) 550 { 551 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 552 unsigned int x; 553 554 if (ip->i_res == NULL) 555 return; 556 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); 557 558 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 559 qdsb_put(ip->i_res->rs_qa_qd[x]); 560 ip->i_res->rs_qa_qd[x] = NULL; 561 } 562 ip->i_res->rs_qa_qd_num = 0; 563 } 564 565 static int sort_qd(const void *a, const void *b) 566 { 567 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a; 568 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b; 569 570 if (!test_bit(QDF_USER, &qd_a->qd_flags) != 571 !test_bit(QDF_USER, &qd_b->qd_flags)) { 572 if (test_bit(QDF_USER, &qd_a->qd_flags)) 573 return -1; 574 else 575 return 1; 576 } 577 if (qd_a->qd_id < qd_b->qd_id) 578 return -1; 579 if (qd_a->qd_id > qd_b->qd_id) 580 return 1; 581 582 return 0; 583 } 584 585 static void do_qc(struct gfs2_quota_data *qd, s64 change) 586 { 587 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 588 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 589 struct gfs2_quota_change *qc = qd->qd_bh_qc; 590 s64 x; 591 592 mutex_lock(&sdp->sd_quota_mutex); 593 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1); 594 595 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) { 596 qc->qc_change = 0; 597 qc->qc_flags = 0; 598 if (test_bit(QDF_USER, &qd->qd_flags)) 599 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER); 600 qc->qc_id = cpu_to_be32(qd->qd_id); 601 } 602 603 x = be64_to_cpu(qc->qc_change) + change; 604 qc->qc_change = cpu_to_be64(x); 605 606 spin_lock(&qd_lru_lock); 607 qd->qd_change = x; 608 spin_unlock(&qd_lru_lock); 609 610 if (!x) { 611 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags)); 612 clear_bit(QDF_CHANGE, &qd->qd_flags); 613 qc->qc_flags = 0; 614 qc->qc_id = 0; 615 slot_put(qd); 616 qd_put(qd); 617 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) { 618 qd_hold(qd); 619 slot_hold(qd); 620 } 621 622 mutex_unlock(&sdp->sd_quota_mutex); 623 } 624 625 /** 626 * gfs2_adjust_quota - adjust record of current block usage 627 * @ip: The quota inode 628 * @loc: Offset of the entry in the quota file 629 * @change: The amount of usage change to record 630 * @qd: The quota data 631 * @fdq: The updated limits to record 632 * 633 * This function was mostly borrowed from gfs2_block_truncate_page which was 634 * in turn mostly borrowed from ext3 635 * 636 * Returns: 0 or -ve on error 637 */ 638 639 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc, 640 s64 change, struct gfs2_quota_data *qd, 641 struct fs_disk_quota *fdq) 642 { 643 struct inode *inode = &ip->i_inode; 644 struct gfs2_sbd *sdp = GFS2_SB(inode); 645 struct address_space *mapping = inode->i_mapping; 646 unsigned long index = loc >> PAGE_CACHE_SHIFT; 647 unsigned offset = loc & (PAGE_CACHE_SIZE - 1); 648 unsigned blocksize, iblock, pos; 649 struct buffer_head *bh; 650 struct page *page; 651 void *kaddr, *ptr; 652 struct gfs2_quota q, *qp; 653 int err, nbytes; 654 u64 size; 655 656 if (gfs2_is_stuffed(ip)) { 657 err = gfs2_unstuff_dinode(ip, NULL); 658 if (err) 659 return err; 660 } 661 662 memset(&q, 0, sizeof(struct gfs2_quota)); 663 err = gfs2_internal_read(ip, (char *)&q, &loc, sizeof(q)); 664 if (err < 0) 665 return err; 666 667 err = -EIO; 668 qp = &q; 669 qp->qu_value = be64_to_cpu(qp->qu_value); 670 qp->qu_value += change; 671 qp->qu_value = cpu_to_be64(qp->qu_value); 672 qd->qd_qb.qb_value = qp->qu_value; 673 if (fdq) { 674 if (fdq->d_fieldmask & FS_DQ_BSOFT) { 675 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift); 676 qd->qd_qb.qb_warn = qp->qu_warn; 677 } 678 if (fdq->d_fieldmask & FS_DQ_BHARD) { 679 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift); 680 qd->qd_qb.qb_limit = qp->qu_limit; 681 } 682 if (fdq->d_fieldmask & FS_DQ_BCOUNT) { 683 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift); 684 qd->qd_qb.qb_value = qp->qu_value; 685 } 686 } 687 688 /* Write the quota into the quota file on disk */ 689 ptr = qp; 690 nbytes = sizeof(struct gfs2_quota); 691 get_a_page: 692 page = find_or_create_page(mapping, index, GFP_NOFS); 693 if (!page) 694 return -ENOMEM; 695 696 blocksize = inode->i_sb->s_blocksize; 697 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 698 699 if (!page_has_buffers(page)) 700 create_empty_buffers(page, blocksize, 0); 701 702 bh = page_buffers(page); 703 pos = blocksize; 704 while (offset >= pos) { 705 bh = bh->b_this_page; 706 iblock++; 707 pos += blocksize; 708 } 709 710 if (!buffer_mapped(bh)) { 711 gfs2_block_map(inode, iblock, bh, 1); 712 if (!buffer_mapped(bh)) 713 goto unlock_out; 714 /* If it's a newly allocated disk block for quota, zero it */ 715 if (buffer_new(bh)) 716 zero_user(page, pos - blocksize, bh->b_size); 717 } 718 719 if (PageUptodate(page)) 720 set_buffer_uptodate(bh); 721 722 if (!buffer_uptodate(bh)) { 723 ll_rw_block(READ | REQ_META, 1, &bh); 724 wait_on_buffer(bh); 725 if (!buffer_uptodate(bh)) 726 goto unlock_out; 727 } 728 729 gfs2_trans_add_bh(ip->i_gl, bh, 0); 730 731 kaddr = kmap_atomic(page); 732 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE) 733 nbytes = PAGE_CACHE_SIZE - offset; 734 memcpy(kaddr + offset, ptr, nbytes); 735 flush_dcache_page(page); 736 kunmap_atomic(kaddr); 737 unlock_page(page); 738 page_cache_release(page); 739 740 /* If quota straddles page boundary, we need to update the rest of the 741 * quota at the beginning of the next page */ 742 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) { 743 ptr = ptr + nbytes; 744 nbytes = sizeof(struct gfs2_quota) - nbytes; 745 offset = 0; 746 index++; 747 goto get_a_page; 748 } 749 750 size = loc + sizeof(struct gfs2_quota); 751 if (size > inode->i_size) 752 i_size_write(inode, size); 753 inode->i_mtime = inode->i_atime = CURRENT_TIME; 754 mark_inode_dirty(inode); 755 return 0; 756 757 unlock_out: 758 unlock_page(page); 759 page_cache_release(page); 760 return err; 761 } 762 763 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 764 { 765 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd; 766 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 767 unsigned int data_blocks, ind_blocks; 768 struct gfs2_holder *ghs, i_gh; 769 unsigned int qx, x; 770 struct gfs2_quota_data *qd; 771 unsigned reserved; 772 loff_t offset; 773 unsigned int nalloc = 0, blocks; 774 int error; 775 776 error = gfs2_rs_alloc(ip); 777 if (error) 778 return error; 779 780 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 781 &data_blocks, &ind_blocks); 782 783 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS); 784 if (!ghs) 785 return -ENOMEM; 786 787 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); 788 mutex_lock(&ip->i_inode.i_mutex); 789 for (qx = 0; qx < num_qd; qx++) { 790 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE, 791 GL_NOCACHE, &ghs[qx]); 792 if (error) 793 goto out; 794 } 795 796 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 797 if (error) 798 goto out; 799 800 for (x = 0; x < num_qd; x++) { 801 offset = qd2offset(qda[x]); 802 if (gfs2_write_alloc_required(ip, offset, 803 sizeof(struct gfs2_quota))) 804 nalloc++; 805 } 806 807 /* 808 * 1 blk for unstuffing inode if stuffed. We add this extra 809 * block to the reservation unconditionally. If the inode 810 * doesn't need unstuffing, the block will be released to the 811 * rgrp since it won't be allocated during the transaction 812 */ 813 /* +3 in the end for unstuffing block, inode size update block 814 * and another block in case quota straddles page boundary and 815 * two blocks need to be updated instead of 1 */ 816 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3; 817 818 reserved = 1 + (nalloc * (data_blocks + ind_blocks)); 819 error = gfs2_inplace_reserve(ip, reserved, 0); 820 if (error) 821 goto out_alloc; 822 823 if (nalloc) 824 blocks += gfs2_rg_blocks(ip, reserved) + nalloc * ind_blocks + RES_STATFS; 825 826 error = gfs2_trans_begin(sdp, blocks, 0); 827 if (error) 828 goto out_ipres; 829 830 for (x = 0; x < num_qd; x++) { 831 qd = qda[x]; 832 offset = qd2offset(qd); 833 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL); 834 if (error) 835 goto out_end_trans; 836 837 do_qc(qd, -qd->qd_change_sync); 838 set_bit(QDF_REFRESH, &qd->qd_flags); 839 } 840 841 error = 0; 842 843 out_end_trans: 844 gfs2_trans_end(sdp); 845 out_ipres: 846 gfs2_inplace_release(ip); 847 out_alloc: 848 gfs2_glock_dq_uninit(&i_gh); 849 out: 850 while (qx--) 851 gfs2_glock_dq_uninit(&ghs[qx]); 852 mutex_unlock(&ip->i_inode.i_mutex); 853 kfree(ghs); 854 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl); 855 return error; 856 } 857 858 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd) 859 { 860 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 861 struct gfs2_quota q; 862 struct gfs2_quota_lvb *qlvb; 863 loff_t pos; 864 int error; 865 866 memset(&q, 0, sizeof(struct gfs2_quota)); 867 pos = qd2offset(qd); 868 error = gfs2_internal_read(ip, (char *)&q, &pos, sizeof(q)); 869 if (error < 0) 870 return error; 871 872 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 873 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC); 874 qlvb->__pad = 0; 875 qlvb->qb_limit = q.qu_limit; 876 qlvb->qb_warn = q.qu_warn; 877 qlvb->qb_value = q.qu_value; 878 qd->qd_qb = *qlvb; 879 880 return 0; 881 } 882 883 static int do_glock(struct gfs2_quota_data *qd, int force_refresh, 884 struct gfs2_holder *q_gh) 885 { 886 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 887 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 888 struct gfs2_holder i_gh; 889 int error; 890 891 restart: 892 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh); 893 if (error) 894 return error; 895 896 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 897 898 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) { 899 gfs2_glock_dq_uninit(q_gh); 900 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 901 GL_NOCACHE, q_gh); 902 if (error) 903 return error; 904 905 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 906 if (error) 907 goto fail; 908 909 error = update_qd(sdp, qd); 910 if (error) 911 goto fail_gunlock; 912 913 gfs2_glock_dq_uninit(&i_gh); 914 gfs2_glock_dq_uninit(q_gh); 915 force_refresh = 0; 916 goto restart; 917 } 918 919 return 0; 920 921 fail_gunlock: 922 gfs2_glock_dq_uninit(&i_gh); 923 fail: 924 gfs2_glock_dq_uninit(q_gh); 925 return error; 926 } 927 928 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid) 929 { 930 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 931 struct gfs2_quota_data *qd; 932 unsigned int x; 933 int error = 0; 934 935 error = gfs2_quota_hold(ip, uid, gid); 936 if (error) 937 return error; 938 939 if (capable(CAP_SYS_RESOURCE) || 940 sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 941 return 0; 942 943 sort(ip->i_res->rs_qa_qd, ip->i_res->rs_qa_qd_num, 944 sizeof(struct gfs2_quota_data *), sort_qd, NULL); 945 946 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 947 int force = NO_FORCE; 948 qd = ip->i_res->rs_qa_qd[x]; 949 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags)) 950 force = FORCE; 951 error = do_glock(qd, force, &ip->i_res->rs_qa_qd_ghs[x]); 952 if (error) 953 break; 954 } 955 956 if (!error) 957 set_bit(GIF_QD_LOCKED, &ip->i_flags); 958 else { 959 while (x--) 960 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]); 961 gfs2_quota_unhold(ip); 962 } 963 964 return error; 965 } 966 967 static int need_sync(struct gfs2_quota_data *qd) 968 { 969 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 970 struct gfs2_tune *gt = &sdp->sd_tune; 971 s64 value; 972 unsigned int num, den; 973 int do_sync = 1; 974 975 if (!qd->qd_qb.qb_limit) 976 return 0; 977 978 spin_lock(&qd_lru_lock); 979 value = qd->qd_change; 980 spin_unlock(&qd_lru_lock); 981 982 spin_lock(>->gt_spin); 983 num = gt->gt_quota_scale_num; 984 den = gt->gt_quota_scale_den; 985 spin_unlock(>->gt_spin); 986 987 if (value < 0) 988 do_sync = 0; 989 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >= 990 (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 991 do_sync = 0; 992 else { 993 value *= gfs2_jindex_size(sdp) * num; 994 value = div_s64(value, den); 995 value += (s64)be64_to_cpu(qd->qd_qb.qb_value); 996 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 997 do_sync = 0; 998 } 999 1000 return do_sync; 1001 } 1002 1003 void gfs2_quota_unlock(struct gfs2_inode *ip) 1004 { 1005 struct gfs2_quota_data *qda[4]; 1006 unsigned int count = 0; 1007 unsigned int x; 1008 1009 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) 1010 goto out; 1011 1012 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 1013 struct gfs2_quota_data *qd; 1014 int sync; 1015 1016 qd = ip->i_res->rs_qa_qd[x]; 1017 sync = need_sync(qd); 1018 1019 gfs2_glock_dq_uninit(&ip->i_res->rs_qa_qd_ghs[x]); 1020 1021 if (sync && qd_trylock(qd)) 1022 qda[count++] = qd; 1023 } 1024 1025 if (count) { 1026 do_sync(count, qda); 1027 for (x = 0; x < count; x++) 1028 qd_unlock(qda[x]); 1029 } 1030 1031 out: 1032 gfs2_quota_unhold(ip); 1033 } 1034 1035 #define MAX_LINE 256 1036 1037 static int print_message(struct gfs2_quota_data *qd, char *type) 1038 { 1039 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 1040 1041 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n", 1042 sdp->sd_fsname, type, 1043 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group", 1044 qd->qd_id); 1045 1046 return 0; 1047 } 1048 1049 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid) 1050 { 1051 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1052 struct gfs2_quota_data *qd; 1053 s64 value; 1054 unsigned int x; 1055 int error = 0; 1056 1057 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags)) 1058 return 0; 1059 1060 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 1061 return 0; 1062 1063 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 1064 qd = ip->i_res->rs_qa_qd[x]; 1065 1066 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || 1067 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags)))) 1068 continue; 1069 1070 value = (s64)be64_to_cpu(qd->qd_qb.qb_value); 1071 spin_lock(&qd_lru_lock); 1072 value += qd->qd_change; 1073 spin_unlock(&qd_lru_lock); 1074 1075 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) { 1076 print_message(qd, "exceeded"); 1077 quota_send_warning(make_kqid(&init_user_ns, 1078 test_bit(QDF_USER, &qd->qd_flags) ? 1079 USRQUOTA : GRPQUOTA, 1080 qd->qd_id), 1081 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN); 1082 1083 error = -EDQUOT; 1084 break; 1085 } else if (be64_to_cpu(qd->qd_qb.qb_warn) && 1086 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value && 1087 time_after_eq(jiffies, qd->qd_last_warn + 1088 gfs2_tune_get(sdp, 1089 gt_quota_warn_period) * HZ)) { 1090 quota_send_warning(make_kqid(&init_user_ns, 1091 test_bit(QDF_USER, &qd->qd_flags) ? 1092 USRQUOTA : GRPQUOTA, 1093 qd->qd_id), 1094 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN); 1095 error = print_message(qd, "warning"); 1096 qd->qd_last_warn = jiffies; 1097 } 1098 } 1099 1100 return error; 1101 } 1102 1103 void gfs2_quota_change(struct gfs2_inode *ip, s64 change, 1104 u32 uid, u32 gid) 1105 { 1106 struct gfs2_quota_data *qd; 1107 unsigned int x; 1108 1109 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change)) 1110 return; 1111 if (ip->i_diskflags & GFS2_DIF_SYSTEM) 1112 return; 1113 1114 for (x = 0; x < ip->i_res->rs_qa_qd_num; x++) { 1115 qd = ip->i_res->rs_qa_qd[x]; 1116 1117 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || 1118 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) { 1119 do_qc(qd, change); 1120 } 1121 } 1122 } 1123 1124 int gfs2_quota_sync(struct super_block *sb, int type) 1125 { 1126 struct gfs2_sbd *sdp = sb->s_fs_info; 1127 struct gfs2_quota_data **qda; 1128 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync); 1129 unsigned int num_qd; 1130 unsigned int x; 1131 int error = 0; 1132 1133 sdp->sd_quota_sync_gen++; 1134 1135 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); 1136 if (!qda) 1137 return -ENOMEM; 1138 1139 do { 1140 num_qd = 0; 1141 1142 for (;;) { 1143 error = qd_fish(sdp, qda + num_qd); 1144 if (error || !qda[num_qd]) 1145 break; 1146 if (++num_qd == max_qd) 1147 break; 1148 } 1149 1150 if (num_qd) { 1151 if (!error) 1152 error = do_sync(num_qd, qda); 1153 if (!error) 1154 for (x = 0; x < num_qd; x++) 1155 qda[x]->qd_sync_gen = 1156 sdp->sd_quota_sync_gen; 1157 1158 for (x = 0; x < num_qd; x++) 1159 qd_unlock(qda[x]); 1160 } 1161 } while (!error && num_qd == max_qd); 1162 1163 kfree(qda); 1164 1165 return error; 1166 } 1167 1168 static int gfs2_quota_sync_timeo(struct super_block *sb, int type) 1169 { 1170 return gfs2_quota_sync(sb, type); 1171 } 1172 1173 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id) 1174 { 1175 struct gfs2_quota_data *qd; 1176 struct gfs2_holder q_gh; 1177 int error; 1178 1179 error = qd_get(sdp, user, id, &qd); 1180 if (error) 1181 return error; 1182 1183 error = do_glock(qd, FORCE, &q_gh); 1184 if (!error) 1185 gfs2_glock_dq_uninit(&q_gh); 1186 1187 qd_put(qd); 1188 return error; 1189 } 1190 1191 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf) 1192 { 1193 const struct gfs2_quota_change *str = buf; 1194 1195 qc->qc_change = be64_to_cpu(str->qc_change); 1196 qc->qc_flags = be32_to_cpu(str->qc_flags); 1197 qc->qc_id = be32_to_cpu(str->qc_id); 1198 } 1199 1200 int gfs2_quota_init(struct gfs2_sbd *sdp) 1201 { 1202 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 1203 u64 size = i_size_read(sdp->sd_qc_inode); 1204 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift; 1205 unsigned int x, slot = 0; 1206 unsigned int found = 0; 1207 u64 dblock; 1208 u32 extlen = 0; 1209 int error; 1210 1211 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20)) 1212 return -EIO; 1213 1214 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block; 1215 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE); 1216 1217 error = -ENOMEM; 1218 1219 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks, 1220 sizeof(unsigned char *), GFP_NOFS); 1221 if (!sdp->sd_quota_bitmap) 1222 return error; 1223 1224 for (x = 0; x < sdp->sd_quota_chunks; x++) { 1225 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS); 1226 if (!sdp->sd_quota_bitmap[x]) 1227 goto fail; 1228 } 1229 1230 for (x = 0; x < blocks; x++) { 1231 struct buffer_head *bh; 1232 unsigned int y; 1233 1234 if (!extlen) { 1235 int new = 0; 1236 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen); 1237 if (error) 1238 goto fail; 1239 } 1240 error = -EIO; 1241 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); 1242 if (!bh) 1243 goto fail; 1244 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) { 1245 brelse(bh); 1246 goto fail; 1247 } 1248 1249 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; 1250 y++, slot++) { 1251 struct gfs2_quota_change_host qc; 1252 struct gfs2_quota_data *qd; 1253 1254 gfs2_quota_change_in(&qc, bh->b_data + 1255 sizeof(struct gfs2_meta_header) + 1256 y * sizeof(struct gfs2_quota_change)); 1257 if (!qc.qc_change) 1258 continue; 1259 1260 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER), 1261 qc.qc_id, &qd); 1262 if (error) { 1263 brelse(bh); 1264 goto fail; 1265 } 1266 1267 set_bit(QDF_CHANGE, &qd->qd_flags); 1268 qd->qd_change = qc.qc_change; 1269 qd->qd_slot = slot; 1270 qd->qd_slot_count = 1; 1271 1272 spin_lock(&qd_lru_lock); 1273 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1); 1274 list_add(&qd->qd_list, &sdp->sd_quota_list); 1275 atomic_inc(&sdp->sd_quota_count); 1276 spin_unlock(&qd_lru_lock); 1277 1278 found++; 1279 } 1280 1281 brelse(bh); 1282 dblock++; 1283 extlen--; 1284 } 1285 1286 if (found) 1287 fs_info(sdp, "found %u quota changes\n", found); 1288 1289 return 0; 1290 1291 fail: 1292 gfs2_quota_cleanup(sdp); 1293 return error; 1294 } 1295 1296 void gfs2_quota_cleanup(struct gfs2_sbd *sdp) 1297 { 1298 struct list_head *head = &sdp->sd_quota_list; 1299 struct gfs2_quota_data *qd; 1300 unsigned int x; 1301 1302 spin_lock(&qd_lru_lock); 1303 while (!list_empty(head)) { 1304 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list); 1305 1306 if (atomic_read(&qd->qd_count) > 1 || 1307 (atomic_read(&qd->qd_count) && 1308 !test_bit(QDF_CHANGE, &qd->qd_flags))) { 1309 list_move(&qd->qd_list, head); 1310 spin_unlock(&qd_lru_lock); 1311 schedule(); 1312 spin_lock(&qd_lru_lock); 1313 continue; 1314 } 1315 1316 list_del(&qd->qd_list); 1317 /* Also remove if this qd exists in the reclaim list */ 1318 if (!list_empty(&qd->qd_reclaim)) { 1319 list_del_init(&qd->qd_reclaim); 1320 atomic_dec(&qd_lru_count); 1321 } 1322 atomic_dec(&sdp->sd_quota_count); 1323 spin_unlock(&qd_lru_lock); 1324 1325 if (!atomic_read(&qd->qd_count)) { 1326 gfs2_assert_warn(sdp, !qd->qd_change); 1327 gfs2_assert_warn(sdp, !qd->qd_slot_count); 1328 } else 1329 gfs2_assert_warn(sdp, qd->qd_slot_count == 1); 1330 gfs2_assert_warn(sdp, !qd->qd_bh_count); 1331 1332 gfs2_glock_put(qd->qd_gl); 1333 kmem_cache_free(gfs2_quotad_cachep, qd); 1334 1335 spin_lock(&qd_lru_lock); 1336 } 1337 spin_unlock(&qd_lru_lock); 1338 1339 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); 1340 1341 if (sdp->sd_quota_bitmap) { 1342 for (x = 0; x < sdp->sd_quota_chunks; x++) 1343 kfree(sdp->sd_quota_bitmap[x]); 1344 kfree(sdp->sd_quota_bitmap); 1345 } 1346 } 1347 1348 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error) 1349 { 1350 if (error == 0 || error == -EROFS) 1351 return; 1352 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 1353 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error); 1354 } 1355 1356 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg, 1357 int (*fxn)(struct super_block *sb, int type), 1358 unsigned long t, unsigned long *timeo, 1359 unsigned int *new_timeo) 1360 { 1361 if (t >= *timeo) { 1362 int error = fxn(sdp->sd_vfs, 0); 1363 quotad_error(sdp, msg, error); 1364 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ; 1365 } else { 1366 *timeo -= t; 1367 } 1368 } 1369 1370 static void quotad_check_trunc_list(struct gfs2_sbd *sdp) 1371 { 1372 struct gfs2_inode *ip; 1373 1374 while(1) { 1375 ip = NULL; 1376 spin_lock(&sdp->sd_trunc_lock); 1377 if (!list_empty(&sdp->sd_trunc_list)) { 1378 ip = list_entry(sdp->sd_trunc_list.next, 1379 struct gfs2_inode, i_trunc_list); 1380 list_del_init(&ip->i_trunc_list); 1381 } 1382 spin_unlock(&sdp->sd_trunc_lock); 1383 if (ip == NULL) 1384 return; 1385 gfs2_glock_finish_truncate(ip); 1386 } 1387 } 1388 1389 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) { 1390 if (!sdp->sd_statfs_force_sync) { 1391 sdp->sd_statfs_force_sync = 1; 1392 wake_up(&sdp->sd_quota_wait); 1393 } 1394 } 1395 1396 1397 /** 1398 * gfs2_quotad - Write cached quota changes into the quota file 1399 * @sdp: Pointer to GFS2 superblock 1400 * 1401 */ 1402 1403 int gfs2_quotad(void *data) 1404 { 1405 struct gfs2_sbd *sdp = data; 1406 struct gfs2_tune *tune = &sdp->sd_tune; 1407 unsigned long statfs_timeo = 0; 1408 unsigned long quotad_timeo = 0; 1409 unsigned long t = 0; 1410 DEFINE_WAIT(wait); 1411 int empty; 1412 1413 while (!kthread_should_stop()) { 1414 1415 /* Update the master statfs file */ 1416 if (sdp->sd_statfs_force_sync) { 1417 int error = gfs2_statfs_sync(sdp->sd_vfs, 0); 1418 quotad_error(sdp, "statfs", error); 1419 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; 1420 } 1421 else 1422 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t, 1423 &statfs_timeo, 1424 &tune->gt_statfs_quantum); 1425 1426 /* Update quota file */ 1427 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t, 1428 "ad_timeo, &tune->gt_quota_quantum); 1429 1430 /* Check for & recover partially truncated inodes */ 1431 quotad_check_trunc_list(sdp); 1432 1433 try_to_freeze(); 1434 1435 t = min(quotad_timeo, statfs_timeo); 1436 1437 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE); 1438 spin_lock(&sdp->sd_trunc_lock); 1439 empty = list_empty(&sdp->sd_trunc_list); 1440 spin_unlock(&sdp->sd_trunc_lock); 1441 if (empty && !sdp->sd_statfs_force_sync) 1442 t -= schedule_timeout(t); 1443 else 1444 t = 0; 1445 finish_wait(&sdp->sd_quota_wait, &wait); 1446 } 1447 1448 return 0; 1449 } 1450 1451 static int gfs2_quota_get_xstate(struct super_block *sb, 1452 struct fs_quota_stat *fqs) 1453 { 1454 struct gfs2_sbd *sdp = sb->s_fs_info; 1455 1456 memset(fqs, 0, sizeof(struct fs_quota_stat)); 1457 fqs->qs_version = FS_QSTAT_VERSION; 1458 1459 switch (sdp->sd_args.ar_quota) { 1460 case GFS2_QUOTA_ON: 1461 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD); 1462 /*FALLTHRU*/ 1463 case GFS2_QUOTA_ACCOUNT: 1464 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT); 1465 break; 1466 case GFS2_QUOTA_OFF: 1467 break; 1468 } 1469 1470 if (sdp->sd_quota_inode) { 1471 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr; 1472 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks; 1473 } 1474 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */ 1475 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */ 1476 fqs->qs_incoredqs = atomic_read(&qd_lru_count); 1477 return 0; 1478 } 1479 1480 static int gfs2_get_dqblk(struct super_block *sb, struct kqid qid, 1481 struct fs_disk_quota *fdq) 1482 { 1483 struct gfs2_sbd *sdp = sb->s_fs_info; 1484 struct gfs2_quota_lvb *qlvb; 1485 struct gfs2_quota_data *qd; 1486 struct gfs2_holder q_gh; 1487 int error; 1488 int type; 1489 1490 memset(fdq, 0, sizeof(struct fs_disk_quota)); 1491 1492 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1493 return -ESRCH; /* Crazy XFS error code */ 1494 1495 if (qid.type == USRQUOTA) 1496 type = QUOTA_USER; 1497 else if (qid.type == GRPQUOTA) 1498 type = QUOTA_GROUP; 1499 else 1500 return -EINVAL; 1501 1502 error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd); 1503 if (error) 1504 return error; 1505 error = do_glock(qd, FORCE, &q_gh); 1506 if (error) 1507 goto out; 1508 1509 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lksb.sb_lvbptr; 1510 fdq->d_version = FS_DQUOT_VERSION; 1511 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA; 1512 fdq->d_id = from_kqid(&init_user_ns, qid); 1513 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift; 1514 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift; 1515 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift; 1516 1517 gfs2_glock_dq_uninit(&q_gh); 1518 out: 1519 qd_put(qd); 1520 return error; 1521 } 1522 1523 /* GFS2 only supports a subset of the XFS fields */ 1524 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT) 1525 1526 static int gfs2_set_dqblk(struct super_block *sb, struct kqid qid, 1527 struct fs_disk_quota *fdq) 1528 { 1529 struct gfs2_sbd *sdp = sb->s_fs_info; 1530 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 1531 struct gfs2_quota_data *qd; 1532 struct gfs2_holder q_gh, i_gh; 1533 unsigned int data_blocks, ind_blocks; 1534 unsigned int blocks = 0; 1535 int alloc_required; 1536 loff_t offset; 1537 int error; 1538 int type; 1539 1540 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1541 return -ESRCH; /* Crazy XFS error code */ 1542 1543 switch(qid.type) { 1544 case USRQUOTA: 1545 type = QUOTA_USER; 1546 if (fdq->d_flags != FS_USER_QUOTA) 1547 return -EINVAL; 1548 break; 1549 case GRPQUOTA: 1550 type = QUOTA_GROUP; 1551 if (fdq->d_flags != FS_GROUP_QUOTA) 1552 return -EINVAL; 1553 break; 1554 default: 1555 return -EINVAL; 1556 } 1557 1558 if (fdq->d_fieldmask & ~GFS2_FIELDMASK) 1559 return -EINVAL; 1560 if (fdq->d_id != from_kqid(&init_user_ns, qid)) 1561 return -EINVAL; 1562 1563 error = qd_get(sdp, type, from_kqid(&init_user_ns, qid), &qd); 1564 if (error) 1565 return error; 1566 1567 error = gfs2_rs_alloc(ip); 1568 if (error) 1569 goto out_put; 1570 1571 mutex_lock(&ip->i_inode.i_mutex); 1572 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh); 1573 if (error) 1574 goto out_unlockput; 1575 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1576 if (error) 1577 goto out_q; 1578 1579 /* Check for existing entry, if none then alloc new blocks */ 1580 error = update_qd(sdp, qd); 1581 if (error) 1582 goto out_i; 1583 1584 /* If nothing has changed, this is a no-op */ 1585 if ((fdq->d_fieldmask & FS_DQ_BSOFT) && 1586 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn))) 1587 fdq->d_fieldmask ^= FS_DQ_BSOFT; 1588 1589 if ((fdq->d_fieldmask & FS_DQ_BHARD) && 1590 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit))) 1591 fdq->d_fieldmask ^= FS_DQ_BHARD; 1592 1593 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) && 1594 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value))) 1595 fdq->d_fieldmask ^= FS_DQ_BCOUNT; 1596 1597 if (fdq->d_fieldmask == 0) 1598 goto out_i; 1599 1600 offset = qd2offset(qd); 1601 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota)); 1602 if (gfs2_is_stuffed(ip)) 1603 alloc_required = 1; 1604 if (alloc_required) { 1605 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 1606 &data_blocks, &ind_blocks); 1607 blocks = 1 + data_blocks + ind_blocks; 1608 error = gfs2_inplace_reserve(ip, blocks, 0); 1609 if (error) 1610 goto out_i; 1611 blocks += gfs2_rg_blocks(ip, blocks); 1612 } 1613 1614 /* Some quotas span block boundaries and can update two blocks, 1615 adding an extra block to the transaction to handle such quotas */ 1616 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0); 1617 if (error) 1618 goto out_release; 1619 1620 /* Apply changes */ 1621 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq); 1622 1623 gfs2_trans_end(sdp); 1624 out_release: 1625 if (alloc_required) 1626 gfs2_inplace_release(ip); 1627 out_i: 1628 gfs2_glock_dq_uninit(&i_gh); 1629 out_q: 1630 gfs2_glock_dq_uninit(&q_gh); 1631 out_unlockput: 1632 mutex_unlock(&ip->i_inode.i_mutex); 1633 out_put: 1634 qd_put(qd); 1635 return error; 1636 } 1637 1638 const struct quotactl_ops gfs2_quotactl_ops = { 1639 .quota_sync = gfs2_quota_sync, 1640 .get_xstate = gfs2_quota_get_xstate, 1641 .get_dqblk = gfs2_get_dqblk, 1642 .set_dqblk = gfs2_set_dqblk, 1643 }; 1644