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_alloc *al = ip->i_alloc; 498 struct gfs2_quota_data **qd = al->al_qd; 499 int error; 500 501 if (gfs2_assert_warn(sdp, !al->al_qd_num) || 502 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) 503 return -EIO; 504 505 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 506 return 0; 507 508 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd); 509 if (error) 510 goto out; 511 al->al_qd_num++; 512 qd++; 513 514 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd); 515 if (error) 516 goto out; 517 al->al_qd_num++; 518 qd++; 519 520 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) { 521 error = qdsb_get(sdp, QUOTA_USER, uid, qd); 522 if (error) 523 goto out; 524 al->al_qd_num++; 525 qd++; 526 } 527 528 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) { 529 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd); 530 if (error) 531 goto out; 532 al->al_qd_num++; 533 qd++; 534 } 535 536 out: 537 if (error) 538 gfs2_quota_unhold(ip); 539 return error; 540 } 541 542 void gfs2_quota_unhold(struct gfs2_inode *ip) 543 { 544 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 545 struct gfs2_alloc *al = ip->i_alloc; 546 unsigned int x; 547 548 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); 549 550 for (x = 0; x < al->al_qd_num; x++) { 551 qdsb_put(al->al_qd[x]); 552 al->al_qd[x] = NULL; 553 } 554 al->al_qd_num = 0; 555 } 556 557 static int sort_qd(const void *a, const void *b) 558 { 559 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a; 560 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b; 561 562 if (!test_bit(QDF_USER, &qd_a->qd_flags) != 563 !test_bit(QDF_USER, &qd_b->qd_flags)) { 564 if (test_bit(QDF_USER, &qd_a->qd_flags)) 565 return -1; 566 else 567 return 1; 568 } 569 if (qd_a->qd_id < qd_b->qd_id) 570 return -1; 571 if (qd_a->qd_id > qd_b->qd_id) 572 return 1; 573 574 return 0; 575 } 576 577 static void do_qc(struct gfs2_quota_data *qd, s64 change) 578 { 579 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 580 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 581 struct gfs2_quota_change *qc = qd->qd_bh_qc; 582 s64 x; 583 584 mutex_lock(&sdp->sd_quota_mutex); 585 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1); 586 587 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) { 588 qc->qc_change = 0; 589 qc->qc_flags = 0; 590 if (test_bit(QDF_USER, &qd->qd_flags)) 591 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER); 592 qc->qc_id = cpu_to_be32(qd->qd_id); 593 } 594 595 x = be64_to_cpu(qc->qc_change) + change; 596 qc->qc_change = cpu_to_be64(x); 597 598 spin_lock(&qd_lru_lock); 599 qd->qd_change = x; 600 spin_unlock(&qd_lru_lock); 601 602 if (!x) { 603 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags)); 604 clear_bit(QDF_CHANGE, &qd->qd_flags); 605 qc->qc_flags = 0; 606 qc->qc_id = 0; 607 slot_put(qd); 608 qd_put(qd); 609 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) { 610 qd_hold(qd); 611 slot_hold(qd); 612 } 613 614 mutex_unlock(&sdp->sd_quota_mutex); 615 } 616 617 /** 618 * gfs2_adjust_quota - adjust record of current block usage 619 * @ip: The quota inode 620 * @loc: Offset of the entry in the quota file 621 * @change: The amount of usage change to record 622 * @qd: The quota data 623 * @fdq: The updated limits to record 624 * 625 * This function was mostly borrowed from gfs2_block_truncate_page which was 626 * in turn mostly borrowed from ext3 627 * 628 * Returns: 0 or -ve on error 629 */ 630 631 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc, 632 s64 change, struct gfs2_quota_data *qd, 633 struct fs_disk_quota *fdq) 634 { 635 struct inode *inode = &ip->i_inode; 636 struct gfs2_sbd *sdp = GFS2_SB(inode); 637 struct address_space *mapping = inode->i_mapping; 638 unsigned long index = loc >> PAGE_CACHE_SHIFT; 639 unsigned offset = loc & (PAGE_CACHE_SIZE - 1); 640 unsigned blocksize, iblock, pos; 641 struct buffer_head *bh, *dibh; 642 struct page *page; 643 void *kaddr, *ptr; 644 struct gfs2_quota q, *qp; 645 int err, nbytes; 646 u64 size; 647 648 if (gfs2_is_stuffed(ip)) 649 gfs2_unstuff_dinode(ip, NULL); 650 651 memset(&q, 0, sizeof(struct gfs2_quota)); 652 err = gfs2_internal_read(ip, NULL, (char *)&q, &loc, sizeof(q)); 653 if (err < 0) 654 return err; 655 656 err = -EIO; 657 qp = &q; 658 qp->qu_value = be64_to_cpu(qp->qu_value); 659 qp->qu_value += change; 660 qp->qu_value = cpu_to_be64(qp->qu_value); 661 qd->qd_qb.qb_value = qp->qu_value; 662 if (fdq) { 663 if (fdq->d_fieldmask & FS_DQ_BSOFT) { 664 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift); 665 qd->qd_qb.qb_warn = qp->qu_warn; 666 } 667 if (fdq->d_fieldmask & FS_DQ_BHARD) { 668 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift); 669 qd->qd_qb.qb_limit = qp->qu_limit; 670 } 671 if (fdq->d_fieldmask & FS_DQ_BCOUNT) { 672 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift); 673 qd->qd_qb.qb_value = qp->qu_value; 674 } 675 } 676 677 /* Write the quota into the quota file on disk */ 678 ptr = qp; 679 nbytes = sizeof(struct gfs2_quota); 680 get_a_page: 681 page = grab_cache_page(mapping, index); 682 if (!page) 683 return -ENOMEM; 684 685 blocksize = inode->i_sb->s_blocksize; 686 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 687 688 if (!page_has_buffers(page)) 689 create_empty_buffers(page, blocksize, 0); 690 691 bh = page_buffers(page); 692 pos = blocksize; 693 while (offset >= pos) { 694 bh = bh->b_this_page; 695 iblock++; 696 pos += blocksize; 697 } 698 699 if (!buffer_mapped(bh)) { 700 gfs2_block_map(inode, iblock, bh, 1); 701 if (!buffer_mapped(bh)) 702 goto unlock_out; 703 /* If it's a newly allocated disk block for quota, zero it */ 704 if (buffer_new(bh)) 705 zero_user(page, pos - blocksize, bh->b_size); 706 } 707 708 if (PageUptodate(page)) 709 set_buffer_uptodate(bh); 710 711 if (!buffer_uptodate(bh)) { 712 ll_rw_block(READ_META, 1, &bh); 713 wait_on_buffer(bh); 714 if (!buffer_uptodate(bh)) 715 goto unlock_out; 716 } 717 718 gfs2_trans_add_bh(ip->i_gl, bh, 0); 719 720 kaddr = kmap_atomic(page, KM_USER0); 721 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE) 722 nbytes = PAGE_CACHE_SIZE - offset; 723 memcpy(kaddr + offset, ptr, nbytes); 724 flush_dcache_page(page); 725 kunmap_atomic(kaddr, KM_USER0); 726 unlock_page(page); 727 page_cache_release(page); 728 729 /* If quota straddles page boundary, we need to update the rest of the 730 * quota at the beginning of the next page */ 731 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) { 732 ptr = ptr + nbytes; 733 nbytes = sizeof(struct gfs2_quota) - nbytes; 734 offset = 0; 735 index++; 736 goto get_a_page; 737 } 738 739 /* Update the disk inode timestamp and size (if extended) */ 740 err = gfs2_meta_inode_buffer(ip, &dibh); 741 if (err) 742 goto out; 743 744 size = loc + sizeof(struct gfs2_quota); 745 if (size > inode->i_size) 746 i_size_write(inode, size); 747 inode->i_mtime = inode->i_atime = CURRENT_TIME; 748 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 749 gfs2_dinode_out(ip, dibh->b_data); 750 brelse(dibh); 751 mark_inode_dirty(inode); 752 753 out: 754 return err; 755 unlock_out: 756 unlock_page(page); 757 page_cache_release(page); 758 return err; 759 } 760 761 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 762 { 763 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd; 764 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 765 unsigned int data_blocks, ind_blocks; 766 struct gfs2_holder *ghs, i_gh; 767 unsigned int qx, x; 768 struct gfs2_quota_data *qd; 769 loff_t offset; 770 unsigned int nalloc = 0, blocks; 771 struct gfs2_alloc *al = NULL; 772 int error; 773 774 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 775 &data_blocks, &ind_blocks); 776 777 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS); 778 if (!ghs) 779 return -ENOMEM; 780 781 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); 782 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA); 783 for (qx = 0; qx < num_qd; qx++) { 784 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE, 785 GL_NOCACHE, &ghs[qx]); 786 if (error) 787 goto out; 788 } 789 790 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 791 if (error) 792 goto out; 793 794 for (x = 0; x < num_qd; x++) { 795 offset = qd2offset(qda[x]); 796 if (gfs2_write_alloc_required(ip, offset, 797 sizeof(struct gfs2_quota))) 798 nalloc++; 799 } 800 801 al = gfs2_alloc_get(ip); 802 if (!al) { 803 error = -ENOMEM; 804 goto out_gunlock; 805 } 806 /* 807 * 1 blk for unstuffing inode if stuffed. We add this extra 808 * block to the reservation unconditionally. If the inode 809 * doesn't need unstuffing, the block will be released to the 810 * rgrp since it won't be allocated during the transaction 811 */ 812 al->al_requested = 1; 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 if (nalloc) 819 al->al_requested += nalloc * (data_blocks + ind_blocks); 820 error = gfs2_inplace_reserve(ip); 821 if (error) 822 goto out_alloc; 823 824 if (nalloc) 825 blocks += gfs2_rg_blocks(al) + nalloc * ind_blocks + RES_STATFS; 826 827 error = gfs2_trans_begin(sdp, blocks, 0); 828 if (error) 829 goto out_ipres; 830 831 for (x = 0; x < num_qd; x++) { 832 qd = qda[x]; 833 offset = qd2offset(qd); 834 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL); 835 if (error) 836 goto out_end_trans; 837 838 do_qc(qd, -qd->qd_change_sync); 839 set_bit(QDF_REFRESH, &qd->qd_flags); 840 } 841 842 error = 0; 843 844 out_end_trans: 845 gfs2_trans_end(sdp); 846 out_ipres: 847 gfs2_inplace_release(ip); 848 out_alloc: 849 gfs2_alloc_put(ip); 850 out_gunlock: 851 gfs2_glock_dq_uninit(&i_gh); 852 out: 853 while (qx--) 854 gfs2_glock_dq_uninit(&ghs[qx]); 855 mutex_unlock(&ip->i_inode.i_mutex); 856 kfree(ghs); 857 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl); 858 return error; 859 } 860 861 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd) 862 { 863 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 864 struct gfs2_quota q; 865 struct gfs2_quota_lvb *qlvb; 866 loff_t pos; 867 int error; 868 869 memset(&q, 0, sizeof(struct gfs2_quota)); 870 pos = qd2offset(qd); 871 error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q)); 872 if (error < 0) 873 return error; 874 875 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb; 876 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC); 877 qlvb->__pad = 0; 878 qlvb->qb_limit = q.qu_limit; 879 qlvb->qb_warn = q.qu_warn; 880 qlvb->qb_value = q.qu_value; 881 qd->qd_qb = *qlvb; 882 883 return 0; 884 } 885 886 static int do_glock(struct gfs2_quota_data *qd, int force_refresh, 887 struct gfs2_holder *q_gh) 888 { 889 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 890 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 891 struct gfs2_holder i_gh; 892 int error; 893 894 restart: 895 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh); 896 if (error) 897 return error; 898 899 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb; 900 901 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) { 902 gfs2_glock_dq_uninit(q_gh); 903 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 904 GL_NOCACHE, q_gh); 905 if (error) 906 return error; 907 908 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 909 if (error) 910 goto fail; 911 912 error = update_qd(sdp, qd); 913 if (error) 914 goto fail_gunlock; 915 916 gfs2_glock_dq_uninit(&i_gh); 917 gfs2_glock_dq_uninit(q_gh); 918 force_refresh = 0; 919 goto restart; 920 } 921 922 return 0; 923 924 fail_gunlock: 925 gfs2_glock_dq_uninit(&i_gh); 926 fail: 927 gfs2_glock_dq_uninit(q_gh); 928 return error; 929 } 930 931 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid) 932 { 933 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 934 struct gfs2_alloc *al = ip->i_alloc; 935 struct gfs2_quota_data *qd; 936 unsigned int x; 937 int error = 0; 938 939 gfs2_quota_hold(ip, uid, gid); 940 941 if (capable(CAP_SYS_RESOURCE) || 942 sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 943 return 0; 944 945 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *), 946 sort_qd, NULL); 947 948 for (x = 0; x < al->al_qd_num; x++) { 949 int force = NO_FORCE; 950 qd = al->al_qd[x]; 951 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags)) 952 force = FORCE; 953 error = do_glock(qd, force, &al->al_qd_ghs[x]); 954 if (error) 955 break; 956 } 957 958 if (!error) 959 set_bit(GIF_QD_LOCKED, &ip->i_flags); 960 else { 961 while (x--) 962 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]); 963 gfs2_quota_unhold(ip); 964 } 965 966 return error; 967 } 968 969 static int need_sync(struct gfs2_quota_data *qd) 970 { 971 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 972 struct gfs2_tune *gt = &sdp->sd_tune; 973 s64 value; 974 unsigned int num, den; 975 int do_sync = 1; 976 977 if (!qd->qd_qb.qb_limit) 978 return 0; 979 980 spin_lock(&qd_lru_lock); 981 value = qd->qd_change; 982 spin_unlock(&qd_lru_lock); 983 984 spin_lock(>->gt_spin); 985 num = gt->gt_quota_scale_num; 986 den = gt->gt_quota_scale_den; 987 spin_unlock(>->gt_spin); 988 989 if (value < 0) 990 do_sync = 0; 991 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >= 992 (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 993 do_sync = 0; 994 else { 995 value *= gfs2_jindex_size(sdp) * num; 996 value = div_s64(value, den); 997 value += (s64)be64_to_cpu(qd->qd_qb.qb_value); 998 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 999 do_sync = 0; 1000 } 1001 1002 return do_sync; 1003 } 1004 1005 void gfs2_quota_unlock(struct gfs2_inode *ip) 1006 { 1007 struct gfs2_alloc *al = ip->i_alloc; 1008 struct gfs2_quota_data *qda[4]; 1009 unsigned int count = 0; 1010 unsigned int x; 1011 1012 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) 1013 goto out; 1014 1015 for (x = 0; x < al->al_qd_num; x++) { 1016 struct gfs2_quota_data *qd; 1017 int sync; 1018 1019 qd = al->al_qd[x]; 1020 sync = need_sync(qd); 1021 1022 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]); 1023 1024 if (sync && qd_trylock(qd)) 1025 qda[count++] = qd; 1026 } 1027 1028 if (count) { 1029 do_sync(count, qda); 1030 for (x = 0; x < count; x++) 1031 qd_unlock(qda[x]); 1032 } 1033 1034 out: 1035 gfs2_quota_unhold(ip); 1036 } 1037 1038 #define MAX_LINE 256 1039 1040 static int print_message(struct gfs2_quota_data *qd, char *type) 1041 { 1042 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 1043 1044 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n", 1045 sdp->sd_fsname, type, 1046 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group", 1047 qd->qd_id); 1048 1049 return 0; 1050 } 1051 1052 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid) 1053 { 1054 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1055 struct gfs2_alloc *al = ip->i_alloc; 1056 struct gfs2_quota_data *qd; 1057 s64 value; 1058 unsigned int x; 1059 int error = 0; 1060 1061 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags)) 1062 return 0; 1063 1064 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 1065 return 0; 1066 1067 for (x = 0; x < al->al_qd_num; x++) { 1068 qd = al->al_qd[x]; 1069 1070 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || 1071 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags)))) 1072 continue; 1073 1074 value = (s64)be64_to_cpu(qd->qd_qb.qb_value); 1075 spin_lock(&qd_lru_lock); 1076 value += qd->qd_change; 1077 spin_unlock(&qd_lru_lock); 1078 1079 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) { 1080 print_message(qd, "exceeded"); 1081 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ? 1082 USRQUOTA : GRPQUOTA, qd->qd_id, 1083 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN); 1084 1085 error = -EDQUOT; 1086 break; 1087 } else if (be64_to_cpu(qd->qd_qb.qb_warn) && 1088 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value && 1089 time_after_eq(jiffies, qd->qd_last_warn + 1090 gfs2_tune_get(sdp, 1091 gt_quota_warn_period) * HZ)) { 1092 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ? 1093 USRQUOTA : GRPQUOTA, 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_alloc *al = ip->i_alloc; 1107 struct gfs2_quota_data *qd; 1108 unsigned int x; 1109 1110 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change)) 1111 return; 1112 if (ip->i_diskflags & GFS2_DIF_SYSTEM) 1113 return; 1114 1115 for (x = 0; x < al->al_qd_num; x++) { 1116 qd = al->al_qd[x]; 1117 1118 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || 1119 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) { 1120 do_qc(qd, change); 1121 } 1122 } 1123 } 1124 1125 int gfs2_quota_sync(struct super_block *sb, int type, int wait) 1126 { 1127 struct gfs2_sbd *sdp = sb->s_fs_info; 1128 struct gfs2_quota_data **qda; 1129 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync); 1130 unsigned int num_qd; 1131 unsigned int x; 1132 int error = 0; 1133 1134 sdp->sd_quota_sync_gen++; 1135 1136 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); 1137 if (!qda) 1138 return -ENOMEM; 1139 1140 do { 1141 num_qd = 0; 1142 1143 for (;;) { 1144 error = qd_fish(sdp, qda + num_qd); 1145 if (error || !qda[num_qd]) 1146 break; 1147 if (++num_qd == max_qd) 1148 break; 1149 } 1150 1151 if (num_qd) { 1152 if (!error) 1153 error = do_sync(num_qd, qda); 1154 if (!error) 1155 for (x = 0; x < num_qd; x++) 1156 qda[x]->qd_sync_gen = 1157 sdp->sd_quota_sync_gen; 1158 1159 for (x = 0; x < num_qd; x++) 1160 qd_unlock(qda[x]); 1161 } 1162 } while (!error && num_qd == max_qd); 1163 1164 kfree(qda); 1165 1166 return error; 1167 } 1168 1169 static int gfs2_quota_sync_timeo(struct super_block *sb, int type) 1170 { 1171 return gfs2_quota_sync(sb, type, 0); 1172 } 1173 1174 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id) 1175 { 1176 struct gfs2_quota_data *qd; 1177 struct gfs2_holder q_gh; 1178 int error; 1179 1180 error = qd_get(sdp, user, id, &qd); 1181 if (error) 1182 return error; 1183 1184 error = do_glock(qd, FORCE, &q_gh); 1185 if (!error) 1186 gfs2_glock_dq_uninit(&q_gh); 1187 1188 qd_put(qd); 1189 return error; 1190 } 1191 1192 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf) 1193 { 1194 const struct gfs2_quota_change *str = buf; 1195 1196 qc->qc_change = be64_to_cpu(str->qc_change); 1197 qc->qc_flags = be32_to_cpu(str->qc_flags); 1198 qc->qc_id = be32_to_cpu(str->qc_id); 1199 } 1200 1201 int gfs2_quota_init(struct gfs2_sbd *sdp) 1202 { 1203 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 1204 u64 size = i_size_read(sdp->sd_qc_inode); 1205 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift; 1206 unsigned int x, slot = 0; 1207 unsigned int found = 0; 1208 u64 dblock; 1209 u32 extlen = 0; 1210 int error; 1211 1212 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20)) 1213 return -EIO; 1214 1215 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block; 1216 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE); 1217 1218 error = -ENOMEM; 1219 1220 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks, 1221 sizeof(unsigned char *), GFP_NOFS); 1222 if (!sdp->sd_quota_bitmap) 1223 return error; 1224 1225 for (x = 0; x < sdp->sd_quota_chunks; x++) { 1226 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS); 1227 if (!sdp->sd_quota_bitmap[x]) 1228 goto fail; 1229 } 1230 1231 for (x = 0; x < blocks; x++) { 1232 struct buffer_head *bh; 1233 unsigned int y; 1234 1235 if (!extlen) { 1236 int new = 0; 1237 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen); 1238 if (error) 1239 goto fail; 1240 } 1241 error = -EIO; 1242 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); 1243 if (!bh) 1244 goto fail; 1245 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) { 1246 brelse(bh); 1247 goto fail; 1248 } 1249 1250 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; 1251 y++, slot++) { 1252 struct gfs2_quota_change_host qc; 1253 struct gfs2_quota_data *qd; 1254 1255 gfs2_quota_change_in(&qc, bh->b_data + 1256 sizeof(struct gfs2_meta_header) + 1257 y * sizeof(struct gfs2_quota_change)); 1258 if (!qc.qc_change) 1259 continue; 1260 1261 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER), 1262 qc.qc_id, &qd); 1263 if (error) { 1264 brelse(bh); 1265 goto fail; 1266 } 1267 1268 set_bit(QDF_CHANGE, &qd->qd_flags); 1269 qd->qd_change = qc.qc_change; 1270 qd->qd_slot = slot; 1271 qd->qd_slot_count = 1; 1272 1273 spin_lock(&qd_lru_lock); 1274 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1); 1275 list_add(&qd->qd_list, &sdp->sd_quota_list); 1276 atomic_inc(&sdp->sd_quota_count); 1277 spin_unlock(&qd_lru_lock); 1278 1279 found++; 1280 } 1281 1282 brelse(bh); 1283 dblock++; 1284 extlen--; 1285 } 1286 1287 if (found) 1288 fs_info(sdp, "found %u quota changes\n", found); 1289 1290 return 0; 1291 1292 fail: 1293 gfs2_quota_cleanup(sdp); 1294 return error; 1295 } 1296 1297 void gfs2_quota_cleanup(struct gfs2_sbd *sdp) 1298 { 1299 struct list_head *head = &sdp->sd_quota_list; 1300 struct gfs2_quota_data *qd; 1301 unsigned int x; 1302 1303 spin_lock(&qd_lru_lock); 1304 while (!list_empty(head)) { 1305 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list); 1306 1307 if (atomic_read(&qd->qd_count) > 1 || 1308 (atomic_read(&qd->qd_count) && 1309 !test_bit(QDF_CHANGE, &qd->qd_flags))) { 1310 list_move(&qd->qd_list, head); 1311 spin_unlock(&qd_lru_lock); 1312 schedule(); 1313 spin_lock(&qd_lru_lock); 1314 continue; 1315 } 1316 1317 list_del(&qd->qd_list); 1318 /* Also remove if this qd exists in the reclaim list */ 1319 if (!list_empty(&qd->qd_reclaim)) { 1320 list_del_init(&qd->qd_reclaim); 1321 atomic_dec(&qd_lru_count); 1322 } 1323 atomic_dec(&sdp->sd_quota_count); 1324 spin_unlock(&qd_lru_lock); 1325 1326 if (!atomic_read(&qd->qd_count)) { 1327 gfs2_assert_warn(sdp, !qd->qd_change); 1328 gfs2_assert_warn(sdp, !qd->qd_slot_count); 1329 } else 1330 gfs2_assert_warn(sdp, qd->qd_slot_count == 1); 1331 gfs2_assert_warn(sdp, !qd->qd_bh_count); 1332 1333 gfs2_glock_put(qd->qd_gl); 1334 kmem_cache_free(gfs2_quotad_cachep, qd); 1335 1336 spin_lock(&qd_lru_lock); 1337 } 1338 spin_unlock(&qd_lru_lock); 1339 1340 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); 1341 1342 if (sdp->sd_quota_bitmap) { 1343 for (x = 0; x < sdp->sd_quota_chunks; x++) 1344 kfree(sdp->sd_quota_bitmap[x]); 1345 kfree(sdp->sd_quota_bitmap); 1346 } 1347 } 1348 1349 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error) 1350 { 1351 if (error == 0 || error == -EROFS) 1352 return; 1353 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 1354 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error); 1355 } 1356 1357 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg, 1358 int (*fxn)(struct super_block *sb, int type), 1359 unsigned long t, unsigned long *timeo, 1360 unsigned int *new_timeo) 1361 { 1362 if (t >= *timeo) { 1363 int error = fxn(sdp->sd_vfs, 0); 1364 quotad_error(sdp, msg, error); 1365 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ; 1366 } else { 1367 *timeo -= t; 1368 } 1369 } 1370 1371 static void quotad_check_trunc_list(struct gfs2_sbd *sdp) 1372 { 1373 struct gfs2_inode *ip; 1374 1375 while(1) { 1376 ip = NULL; 1377 spin_lock(&sdp->sd_trunc_lock); 1378 if (!list_empty(&sdp->sd_trunc_list)) { 1379 ip = list_entry(sdp->sd_trunc_list.next, 1380 struct gfs2_inode, i_trunc_list); 1381 list_del_init(&ip->i_trunc_list); 1382 } 1383 spin_unlock(&sdp->sd_trunc_lock); 1384 if (ip == NULL) 1385 return; 1386 gfs2_glock_finish_truncate(ip); 1387 } 1388 } 1389 1390 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) { 1391 if (!sdp->sd_statfs_force_sync) { 1392 sdp->sd_statfs_force_sync = 1; 1393 wake_up(&sdp->sd_quota_wait); 1394 } 1395 } 1396 1397 1398 /** 1399 * gfs2_quotad - Write cached quota changes into the quota file 1400 * @sdp: Pointer to GFS2 superblock 1401 * 1402 */ 1403 1404 int gfs2_quotad(void *data) 1405 { 1406 struct gfs2_sbd *sdp = data; 1407 struct gfs2_tune *tune = &sdp->sd_tune; 1408 unsigned long statfs_timeo = 0; 1409 unsigned long quotad_timeo = 0; 1410 unsigned long t = 0; 1411 DEFINE_WAIT(wait); 1412 int empty; 1413 1414 while (!kthread_should_stop()) { 1415 1416 /* Update the master statfs file */ 1417 if (sdp->sd_statfs_force_sync) { 1418 int error = gfs2_statfs_sync(sdp->sd_vfs, 0); 1419 quotad_error(sdp, "statfs", error); 1420 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; 1421 } 1422 else 1423 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t, 1424 &statfs_timeo, 1425 &tune->gt_statfs_quantum); 1426 1427 /* Update quota file */ 1428 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t, 1429 "ad_timeo, &tune->gt_quota_quantum); 1430 1431 /* Check for & recover partially truncated inodes */ 1432 quotad_check_trunc_list(sdp); 1433 1434 if (freezing(current)) 1435 refrigerator(); 1436 t = min(quotad_timeo, statfs_timeo); 1437 1438 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE); 1439 spin_lock(&sdp->sd_trunc_lock); 1440 empty = list_empty(&sdp->sd_trunc_list); 1441 spin_unlock(&sdp->sd_trunc_lock); 1442 if (empty && !sdp->sd_statfs_force_sync) 1443 t -= schedule_timeout(t); 1444 else 1445 t = 0; 1446 finish_wait(&sdp->sd_quota_wait, &wait); 1447 } 1448 1449 return 0; 1450 } 1451 1452 static int gfs2_quota_get_xstate(struct super_block *sb, 1453 struct fs_quota_stat *fqs) 1454 { 1455 struct gfs2_sbd *sdp = sb->s_fs_info; 1456 1457 memset(fqs, 0, sizeof(struct fs_quota_stat)); 1458 fqs->qs_version = FS_QSTAT_VERSION; 1459 1460 switch (sdp->sd_args.ar_quota) { 1461 case GFS2_QUOTA_ON: 1462 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD); 1463 /*FALLTHRU*/ 1464 case GFS2_QUOTA_ACCOUNT: 1465 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT); 1466 break; 1467 case GFS2_QUOTA_OFF: 1468 break; 1469 } 1470 1471 if (sdp->sd_quota_inode) { 1472 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr; 1473 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks; 1474 } 1475 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */ 1476 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */ 1477 fqs->qs_incoredqs = atomic_read(&qd_lru_count); 1478 return 0; 1479 } 1480 1481 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id, 1482 struct fs_disk_quota *fdq) 1483 { 1484 struct gfs2_sbd *sdp = sb->s_fs_info; 1485 struct gfs2_quota_lvb *qlvb; 1486 struct gfs2_quota_data *qd; 1487 struct gfs2_holder q_gh; 1488 int error; 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 (type == USRQUOTA) 1496 type = QUOTA_USER; 1497 else if (type == GRPQUOTA) 1498 type = QUOTA_GROUP; 1499 else 1500 return -EINVAL; 1501 1502 error = qd_get(sdp, type, id, &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_lvb; 1510 fdq->d_version = FS_DQUOT_VERSION; 1511 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA; 1512 fdq->d_id = id; 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, int type, qid_t id, 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 struct gfs2_alloc *al; 1537 loff_t offset; 1538 int error; 1539 1540 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1541 return -ESRCH; /* Crazy XFS error code */ 1542 1543 switch(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 != id) 1561 return -EINVAL; 1562 1563 error = qd_get(sdp, type, id, &qd); 1564 if (error) 1565 return error; 1566 1567 mutex_lock(&ip->i_inode.i_mutex); 1568 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh); 1569 if (error) 1570 goto out_put; 1571 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1572 if (error) 1573 goto out_q; 1574 1575 /* Check for existing entry, if none then alloc new blocks */ 1576 error = update_qd(sdp, qd); 1577 if (error) 1578 goto out_i; 1579 1580 /* If nothing has changed, this is a no-op */ 1581 if ((fdq->d_fieldmask & FS_DQ_BSOFT) && 1582 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn))) 1583 fdq->d_fieldmask ^= FS_DQ_BSOFT; 1584 1585 if ((fdq->d_fieldmask & FS_DQ_BHARD) && 1586 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit))) 1587 fdq->d_fieldmask ^= FS_DQ_BHARD; 1588 1589 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) && 1590 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value))) 1591 fdq->d_fieldmask ^= FS_DQ_BCOUNT; 1592 1593 if (fdq->d_fieldmask == 0) 1594 goto out_i; 1595 1596 offset = qd2offset(qd); 1597 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota)); 1598 if (gfs2_is_stuffed(ip)) 1599 alloc_required = 1; 1600 if (alloc_required) { 1601 al = gfs2_alloc_get(ip); 1602 if (al == NULL) 1603 goto out_i; 1604 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 1605 &data_blocks, &ind_blocks); 1606 blocks = al->al_requested = 1 + data_blocks + ind_blocks; 1607 error = gfs2_inplace_reserve(ip); 1608 if (error) 1609 goto out_alloc; 1610 blocks += gfs2_rg_blocks(al); 1611 } 1612 1613 /* Some quotas span block boundaries and can update two blocks, 1614 adding an extra block to the transaction to handle such quotas */ 1615 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0); 1616 if (error) 1617 goto out_release; 1618 1619 /* Apply changes */ 1620 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq); 1621 1622 gfs2_trans_end(sdp); 1623 out_release: 1624 if (alloc_required) { 1625 gfs2_inplace_release(ip); 1626 out_alloc: 1627 gfs2_alloc_put(ip); 1628 } 1629 out_i: 1630 gfs2_glock_dq_uninit(&i_gh); 1631 out_q: 1632 gfs2_glock_dq_uninit(&q_gh); 1633 out_put: 1634 mutex_unlock(&ip->i_inode.i_mutex); 1635 qd_put(qd); 1636 return error; 1637 } 1638 1639 const struct quotactl_ops gfs2_quotactl_ops = { 1640 .quota_sync = gfs2_quota_sync, 1641 .get_xstate = gfs2_quota_get_xstate, 1642 .get_dqblk = gfs2_get_dqblk, 1643 .set_dqblk = gfs2_set_dqblk, 1644 }; 1645