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/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/kthread.h> 49 #include <linux/freezer.h> 50 #include <linux/quota.h> 51 #include <linux/dqblk_xfs.h> 52 53 #include "gfs2.h" 54 #include "incore.h" 55 #include "bmap.h" 56 #include "glock.h" 57 #include "glops.h" 58 #include "log.h" 59 #include "meta_io.h" 60 #include "quota.h" 61 #include "rgrp.h" 62 #include "super.h" 63 #include "trans.h" 64 #include "inode.h" 65 #include "util.h" 66 67 #define QUOTA_USER 1 68 #define QUOTA_GROUP 0 69 70 struct gfs2_quota_change_host { 71 u64 qc_change; 72 u32 qc_flags; /* GFS2_QCF_... */ 73 u32 qc_id; 74 }; 75 76 static LIST_HEAD(qd_lru_list); 77 static atomic_t qd_lru_count = ATOMIC_INIT(0); 78 static DEFINE_SPINLOCK(qd_lru_lock); 79 80 int gfs2_shrink_qd_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask) 81 { 82 struct gfs2_quota_data *qd; 83 struct gfs2_sbd *sdp; 84 85 if (nr == 0) 86 goto out; 87 88 if (!(gfp_mask & __GFP_FS)) 89 return -1; 90 91 spin_lock(&qd_lru_lock); 92 while (nr && !list_empty(&qd_lru_list)) { 93 qd = list_entry(qd_lru_list.next, 94 struct gfs2_quota_data, qd_reclaim); 95 sdp = qd->qd_gl->gl_sbd; 96 97 /* Free from the filesystem-specific list */ 98 list_del(&qd->qd_list); 99 100 gfs2_assert_warn(sdp, !qd->qd_change); 101 gfs2_assert_warn(sdp, !qd->qd_slot_count); 102 gfs2_assert_warn(sdp, !qd->qd_bh_count); 103 104 gfs2_glock_put(qd->qd_gl); 105 atomic_dec(&sdp->sd_quota_count); 106 107 /* Delete it from the common reclaim list */ 108 list_del_init(&qd->qd_reclaim); 109 atomic_dec(&qd_lru_count); 110 spin_unlock(&qd_lru_lock); 111 kmem_cache_free(gfs2_quotad_cachep, qd); 112 spin_lock(&qd_lru_lock); 113 nr--; 114 } 115 spin_unlock(&qd_lru_lock); 116 117 out: 118 return (atomic_read(&qd_lru_count) * sysctl_vfs_cache_pressure) / 100; 119 } 120 121 static u64 qd2offset(struct gfs2_quota_data *qd) 122 { 123 u64 offset; 124 125 offset = 2 * (u64)qd->qd_id + !test_bit(QDF_USER, &qd->qd_flags); 126 offset *= sizeof(struct gfs2_quota); 127 128 return offset; 129 } 130 131 static int qd_alloc(struct gfs2_sbd *sdp, int user, u32 id, 132 struct gfs2_quota_data **qdp) 133 { 134 struct gfs2_quota_data *qd; 135 int error; 136 137 qd = kmem_cache_zalloc(gfs2_quotad_cachep, GFP_NOFS); 138 if (!qd) 139 return -ENOMEM; 140 141 atomic_set(&qd->qd_count, 1); 142 qd->qd_id = id; 143 if (user) 144 set_bit(QDF_USER, &qd->qd_flags); 145 qd->qd_slot = -1; 146 INIT_LIST_HEAD(&qd->qd_reclaim); 147 148 error = gfs2_glock_get(sdp, 2 * (u64)id + !user, 149 &gfs2_quota_glops, CREATE, &qd->qd_gl); 150 if (error) 151 goto fail; 152 153 *qdp = qd; 154 155 return 0; 156 157 fail: 158 kmem_cache_free(gfs2_quotad_cachep, qd); 159 return error; 160 } 161 162 static int qd_get(struct gfs2_sbd *sdp, int user, u32 id, 163 struct gfs2_quota_data **qdp) 164 { 165 struct gfs2_quota_data *qd = NULL, *new_qd = NULL; 166 int error, found; 167 168 *qdp = NULL; 169 170 for (;;) { 171 found = 0; 172 spin_lock(&qd_lru_lock); 173 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { 174 if (qd->qd_id == id && 175 !test_bit(QDF_USER, &qd->qd_flags) == !user) { 176 if (!atomic_read(&qd->qd_count) && 177 !list_empty(&qd->qd_reclaim)) { 178 /* Remove it from reclaim list */ 179 list_del_init(&qd->qd_reclaim); 180 atomic_dec(&qd_lru_count); 181 } 182 atomic_inc(&qd->qd_count); 183 found = 1; 184 break; 185 } 186 } 187 188 if (!found) 189 qd = NULL; 190 191 if (!qd && new_qd) { 192 qd = new_qd; 193 list_add(&qd->qd_list, &sdp->sd_quota_list); 194 atomic_inc(&sdp->sd_quota_count); 195 new_qd = NULL; 196 } 197 198 spin_unlock(&qd_lru_lock); 199 200 if (qd) { 201 if (new_qd) { 202 gfs2_glock_put(new_qd->qd_gl); 203 kmem_cache_free(gfs2_quotad_cachep, new_qd); 204 } 205 *qdp = qd; 206 return 0; 207 } 208 209 error = qd_alloc(sdp, user, id, &new_qd); 210 if (error) 211 return error; 212 } 213 } 214 215 static void qd_hold(struct gfs2_quota_data *qd) 216 { 217 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 218 gfs2_assert(sdp, atomic_read(&qd->qd_count)); 219 atomic_inc(&qd->qd_count); 220 } 221 222 static void qd_put(struct gfs2_quota_data *qd) 223 { 224 if (atomic_dec_and_lock(&qd->qd_count, &qd_lru_lock)) { 225 /* Add to the reclaim list */ 226 list_add_tail(&qd->qd_reclaim, &qd_lru_list); 227 atomic_inc(&qd_lru_count); 228 spin_unlock(&qd_lru_lock); 229 } 230 } 231 232 static int slot_get(struct gfs2_quota_data *qd) 233 { 234 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 235 unsigned int c, o = 0, b; 236 unsigned char byte = 0; 237 238 spin_lock(&qd_lru_lock); 239 240 if (qd->qd_slot_count++) { 241 spin_unlock(&qd_lru_lock); 242 return 0; 243 } 244 245 for (c = 0; c < sdp->sd_quota_chunks; c++) 246 for (o = 0; o < PAGE_SIZE; o++) { 247 byte = sdp->sd_quota_bitmap[c][o]; 248 if (byte != 0xFF) 249 goto found; 250 } 251 252 goto fail; 253 254 found: 255 for (b = 0; b < 8; b++) 256 if (!(byte & (1 << b))) 257 break; 258 qd->qd_slot = c * (8 * PAGE_SIZE) + o * 8 + b; 259 260 if (qd->qd_slot >= sdp->sd_quota_slots) 261 goto fail; 262 263 sdp->sd_quota_bitmap[c][o] |= 1 << b; 264 265 spin_unlock(&qd_lru_lock); 266 267 return 0; 268 269 fail: 270 qd->qd_slot_count--; 271 spin_unlock(&qd_lru_lock); 272 return -ENOSPC; 273 } 274 275 static void slot_hold(struct gfs2_quota_data *qd) 276 { 277 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 278 279 spin_lock(&qd_lru_lock); 280 gfs2_assert(sdp, qd->qd_slot_count); 281 qd->qd_slot_count++; 282 spin_unlock(&qd_lru_lock); 283 } 284 285 static void slot_put(struct gfs2_quota_data *qd) 286 { 287 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 288 289 spin_lock(&qd_lru_lock); 290 gfs2_assert(sdp, qd->qd_slot_count); 291 if (!--qd->qd_slot_count) { 292 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, qd->qd_slot, 0); 293 qd->qd_slot = -1; 294 } 295 spin_unlock(&qd_lru_lock); 296 } 297 298 static int bh_get(struct gfs2_quota_data *qd) 299 { 300 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 301 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 302 unsigned int block, offset; 303 struct buffer_head *bh; 304 int error; 305 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 }; 306 307 mutex_lock(&sdp->sd_quota_mutex); 308 309 if (qd->qd_bh_count++) { 310 mutex_unlock(&sdp->sd_quota_mutex); 311 return 0; 312 } 313 314 block = qd->qd_slot / sdp->sd_qc_per_block; 315 offset = qd->qd_slot % sdp->sd_qc_per_block; 316 317 bh_map.b_size = 1 << ip->i_inode.i_blkbits; 318 error = gfs2_block_map(&ip->i_inode, block, &bh_map, 0); 319 if (error) 320 goto fail; 321 error = gfs2_meta_read(ip->i_gl, bh_map.b_blocknr, DIO_WAIT, &bh); 322 if (error) 323 goto fail; 324 error = -EIO; 325 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) 326 goto fail_brelse; 327 328 qd->qd_bh = bh; 329 qd->qd_bh_qc = (struct gfs2_quota_change *) 330 (bh->b_data + sizeof(struct gfs2_meta_header) + 331 offset * sizeof(struct gfs2_quota_change)); 332 333 mutex_unlock(&sdp->sd_quota_mutex); 334 335 return 0; 336 337 fail_brelse: 338 brelse(bh); 339 fail: 340 qd->qd_bh_count--; 341 mutex_unlock(&sdp->sd_quota_mutex); 342 return error; 343 } 344 345 static void bh_put(struct gfs2_quota_data *qd) 346 { 347 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 348 349 mutex_lock(&sdp->sd_quota_mutex); 350 gfs2_assert(sdp, qd->qd_bh_count); 351 if (!--qd->qd_bh_count) { 352 brelse(qd->qd_bh); 353 qd->qd_bh = NULL; 354 qd->qd_bh_qc = NULL; 355 } 356 mutex_unlock(&sdp->sd_quota_mutex); 357 } 358 359 static int qd_fish(struct gfs2_sbd *sdp, struct gfs2_quota_data **qdp) 360 { 361 struct gfs2_quota_data *qd = NULL; 362 int error; 363 int found = 0; 364 365 *qdp = NULL; 366 367 if (sdp->sd_vfs->s_flags & MS_RDONLY) 368 return 0; 369 370 spin_lock(&qd_lru_lock); 371 372 list_for_each_entry(qd, &sdp->sd_quota_list, qd_list) { 373 if (test_bit(QDF_LOCKED, &qd->qd_flags) || 374 !test_bit(QDF_CHANGE, &qd->qd_flags) || 375 qd->qd_sync_gen >= sdp->sd_quota_sync_gen) 376 continue; 377 378 list_move_tail(&qd->qd_list, &sdp->sd_quota_list); 379 380 set_bit(QDF_LOCKED, &qd->qd_flags); 381 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count)); 382 atomic_inc(&qd->qd_count); 383 qd->qd_change_sync = qd->qd_change; 384 gfs2_assert_warn(sdp, qd->qd_slot_count); 385 qd->qd_slot_count++; 386 found = 1; 387 388 break; 389 } 390 391 if (!found) 392 qd = NULL; 393 394 spin_unlock(&qd_lru_lock); 395 396 if (qd) { 397 gfs2_assert_warn(sdp, qd->qd_change_sync); 398 error = bh_get(qd); 399 if (error) { 400 clear_bit(QDF_LOCKED, &qd->qd_flags); 401 slot_put(qd); 402 qd_put(qd); 403 return error; 404 } 405 } 406 407 *qdp = qd; 408 409 return 0; 410 } 411 412 static int qd_trylock(struct gfs2_quota_data *qd) 413 { 414 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 415 416 if (sdp->sd_vfs->s_flags & MS_RDONLY) 417 return 0; 418 419 spin_lock(&qd_lru_lock); 420 421 if (test_bit(QDF_LOCKED, &qd->qd_flags) || 422 !test_bit(QDF_CHANGE, &qd->qd_flags)) { 423 spin_unlock(&qd_lru_lock); 424 return 0; 425 } 426 427 list_move_tail(&qd->qd_list, &sdp->sd_quota_list); 428 429 set_bit(QDF_LOCKED, &qd->qd_flags); 430 gfs2_assert_warn(sdp, atomic_read(&qd->qd_count)); 431 atomic_inc(&qd->qd_count); 432 qd->qd_change_sync = qd->qd_change; 433 gfs2_assert_warn(sdp, qd->qd_slot_count); 434 qd->qd_slot_count++; 435 436 spin_unlock(&qd_lru_lock); 437 438 gfs2_assert_warn(sdp, qd->qd_change_sync); 439 if (bh_get(qd)) { 440 clear_bit(QDF_LOCKED, &qd->qd_flags); 441 slot_put(qd); 442 qd_put(qd); 443 return 0; 444 } 445 446 return 1; 447 } 448 449 static void qd_unlock(struct gfs2_quota_data *qd) 450 { 451 gfs2_assert_warn(qd->qd_gl->gl_sbd, 452 test_bit(QDF_LOCKED, &qd->qd_flags)); 453 clear_bit(QDF_LOCKED, &qd->qd_flags); 454 bh_put(qd); 455 slot_put(qd); 456 qd_put(qd); 457 } 458 459 static int qdsb_get(struct gfs2_sbd *sdp, int user, u32 id, 460 struct gfs2_quota_data **qdp) 461 { 462 int error; 463 464 error = qd_get(sdp, user, id, qdp); 465 if (error) 466 return error; 467 468 error = slot_get(*qdp); 469 if (error) 470 goto fail; 471 472 error = bh_get(*qdp); 473 if (error) 474 goto fail_slot; 475 476 return 0; 477 478 fail_slot: 479 slot_put(*qdp); 480 fail: 481 qd_put(*qdp); 482 return error; 483 } 484 485 static void qdsb_put(struct gfs2_quota_data *qd) 486 { 487 bh_put(qd); 488 slot_put(qd); 489 qd_put(qd); 490 } 491 492 int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid) 493 { 494 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 495 struct gfs2_alloc *al = ip->i_alloc; 496 struct gfs2_quota_data **qd = al->al_qd; 497 int error; 498 499 if (gfs2_assert_warn(sdp, !al->al_qd_num) || 500 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags))) 501 return -EIO; 502 503 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 504 return 0; 505 506 error = qdsb_get(sdp, QUOTA_USER, ip->i_inode.i_uid, qd); 507 if (error) 508 goto out; 509 al->al_qd_num++; 510 qd++; 511 512 error = qdsb_get(sdp, QUOTA_GROUP, ip->i_inode.i_gid, qd); 513 if (error) 514 goto out; 515 al->al_qd_num++; 516 qd++; 517 518 if (uid != NO_QUOTA_CHANGE && uid != ip->i_inode.i_uid) { 519 error = qdsb_get(sdp, QUOTA_USER, uid, qd); 520 if (error) 521 goto out; 522 al->al_qd_num++; 523 qd++; 524 } 525 526 if (gid != NO_QUOTA_CHANGE && gid != ip->i_inode.i_gid) { 527 error = qdsb_get(sdp, QUOTA_GROUP, gid, qd); 528 if (error) 529 goto out; 530 al->al_qd_num++; 531 qd++; 532 } 533 534 out: 535 if (error) 536 gfs2_quota_unhold(ip); 537 return error; 538 } 539 540 void gfs2_quota_unhold(struct gfs2_inode *ip) 541 { 542 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 543 struct gfs2_alloc *al = ip->i_alloc; 544 unsigned int x; 545 546 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); 547 548 for (x = 0; x < al->al_qd_num; x++) { 549 qdsb_put(al->al_qd[x]); 550 al->al_qd[x] = NULL; 551 } 552 al->al_qd_num = 0; 553 } 554 555 static int sort_qd(const void *a, const void *b) 556 { 557 const struct gfs2_quota_data *qd_a = *(const struct gfs2_quota_data **)a; 558 const struct gfs2_quota_data *qd_b = *(const struct gfs2_quota_data **)b; 559 560 if (!test_bit(QDF_USER, &qd_a->qd_flags) != 561 !test_bit(QDF_USER, &qd_b->qd_flags)) { 562 if (test_bit(QDF_USER, &qd_a->qd_flags)) 563 return -1; 564 else 565 return 1; 566 } 567 if (qd_a->qd_id < qd_b->qd_id) 568 return -1; 569 if (qd_a->qd_id > qd_b->qd_id) 570 return 1; 571 572 return 0; 573 } 574 575 static void do_qc(struct gfs2_quota_data *qd, s64 change) 576 { 577 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 578 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 579 struct gfs2_quota_change *qc = qd->qd_bh_qc; 580 s64 x; 581 582 mutex_lock(&sdp->sd_quota_mutex); 583 gfs2_trans_add_bh(ip->i_gl, qd->qd_bh, 1); 584 585 if (!test_bit(QDF_CHANGE, &qd->qd_flags)) { 586 qc->qc_change = 0; 587 qc->qc_flags = 0; 588 if (test_bit(QDF_USER, &qd->qd_flags)) 589 qc->qc_flags = cpu_to_be32(GFS2_QCF_USER); 590 qc->qc_id = cpu_to_be32(qd->qd_id); 591 } 592 593 x = be64_to_cpu(qc->qc_change) + change; 594 qc->qc_change = cpu_to_be64(x); 595 596 spin_lock(&qd_lru_lock); 597 qd->qd_change = x; 598 spin_unlock(&qd_lru_lock); 599 600 if (!x) { 601 gfs2_assert_warn(sdp, test_bit(QDF_CHANGE, &qd->qd_flags)); 602 clear_bit(QDF_CHANGE, &qd->qd_flags); 603 qc->qc_flags = 0; 604 qc->qc_id = 0; 605 slot_put(qd); 606 qd_put(qd); 607 } else if (!test_and_set_bit(QDF_CHANGE, &qd->qd_flags)) { 608 qd_hold(qd); 609 slot_hold(qd); 610 } 611 612 mutex_unlock(&sdp->sd_quota_mutex); 613 } 614 615 /** 616 * gfs2_adjust_quota - adjust record of current block usage 617 * @ip: The quota inode 618 * @loc: Offset of the entry in the quota file 619 * @change: The amount of usage change to record 620 * @qd: The quota data 621 * @fdq: The updated limits to record 622 * 623 * This function was mostly borrowed from gfs2_block_truncate_page which was 624 * in turn mostly borrowed from ext3 625 * 626 * Returns: 0 or -ve on error 627 */ 628 629 static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc, 630 s64 change, struct gfs2_quota_data *qd, 631 struct fs_disk_quota *fdq) 632 { 633 struct inode *inode = &ip->i_inode; 634 struct gfs2_sbd *sdp = GFS2_SB(inode); 635 struct address_space *mapping = inode->i_mapping; 636 unsigned long index = loc >> PAGE_CACHE_SHIFT; 637 unsigned offset = loc & (PAGE_CACHE_SIZE - 1); 638 unsigned blocksize, iblock, pos; 639 struct buffer_head *bh, *dibh; 640 struct page *page; 641 void *kaddr, *ptr; 642 struct gfs2_quota q, *qp; 643 int err, nbytes; 644 u64 size; 645 646 if (gfs2_is_stuffed(ip)) 647 gfs2_unstuff_dinode(ip, NULL); 648 649 memset(&q, 0, sizeof(struct gfs2_quota)); 650 err = gfs2_internal_read(ip, NULL, (char *)&q, &loc, sizeof(q)); 651 if (err < 0) 652 return err; 653 654 err = -EIO; 655 qp = &q; 656 qp->qu_value = be64_to_cpu(qp->qu_value); 657 qp->qu_value += change; 658 qp->qu_value = cpu_to_be64(qp->qu_value); 659 qd->qd_qb.qb_value = qp->qu_value; 660 if (fdq) { 661 if (fdq->d_fieldmask & FS_DQ_BSOFT) { 662 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift); 663 qd->qd_qb.qb_warn = qp->qu_warn; 664 } 665 if (fdq->d_fieldmask & FS_DQ_BHARD) { 666 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift); 667 qd->qd_qb.qb_limit = qp->qu_limit; 668 } 669 if (fdq->d_fieldmask & FS_DQ_BCOUNT) { 670 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift); 671 qd->qd_qb.qb_value = qp->qu_value; 672 } 673 } 674 675 /* Write the quota into the quota file on disk */ 676 ptr = qp; 677 nbytes = sizeof(struct gfs2_quota); 678 get_a_page: 679 page = grab_cache_page(mapping, index); 680 if (!page) 681 return -ENOMEM; 682 683 blocksize = inode->i_sb->s_blocksize; 684 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 685 686 if (!page_has_buffers(page)) 687 create_empty_buffers(page, blocksize, 0); 688 689 bh = page_buffers(page); 690 pos = blocksize; 691 while (offset >= pos) { 692 bh = bh->b_this_page; 693 iblock++; 694 pos += blocksize; 695 } 696 697 if (!buffer_mapped(bh)) { 698 gfs2_block_map(inode, iblock, bh, 1); 699 if (!buffer_mapped(bh)) 700 goto unlock_out; 701 /* If it's a newly allocated disk block for quota, zero it */ 702 if (buffer_new(bh)) 703 zero_user(page, pos - blocksize, bh->b_size); 704 } 705 706 if (PageUptodate(page)) 707 set_buffer_uptodate(bh); 708 709 if (!buffer_uptodate(bh)) { 710 ll_rw_block(READ_META, 1, &bh); 711 wait_on_buffer(bh); 712 if (!buffer_uptodate(bh)) 713 goto unlock_out; 714 } 715 716 gfs2_trans_add_bh(ip->i_gl, bh, 0); 717 718 kaddr = kmap_atomic(page, KM_USER0); 719 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE) 720 nbytes = PAGE_CACHE_SIZE - offset; 721 memcpy(kaddr + offset, ptr, nbytes); 722 flush_dcache_page(page); 723 kunmap_atomic(kaddr, KM_USER0); 724 unlock_page(page); 725 page_cache_release(page); 726 727 /* If quota straddles page boundary, we need to update the rest of the 728 * quota at the beginning of the next page */ 729 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) { 730 ptr = ptr + nbytes; 731 nbytes = sizeof(struct gfs2_quota) - nbytes; 732 offset = 0; 733 index++; 734 goto get_a_page; 735 } 736 737 /* Update the disk inode timestamp and size (if extended) */ 738 err = gfs2_meta_inode_buffer(ip, &dibh); 739 if (err) 740 goto out; 741 742 size = loc + sizeof(struct gfs2_quota); 743 if (size > inode->i_size) 744 i_size_write(inode, size); 745 inode->i_mtime = inode->i_atime = CURRENT_TIME; 746 gfs2_trans_add_bh(ip->i_gl, dibh, 1); 747 gfs2_dinode_out(ip, dibh->b_data); 748 brelse(dibh); 749 mark_inode_dirty(inode); 750 751 out: 752 return err; 753 unlock_out: 754 unlock_page(page); 755 page_cache_release(page); 756 return err; 757 } 758 759 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 760 { 761 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd; 762 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 763 unsigned int data_blocks, ind_blocks; 764 struct gfs2_holder *ghs, i_gh; 765 unsigned int qx, x; 766 struct gfs2_quota_data *qd; 767 loff_t offset; 768 unsigned int nalloc = 0, blocks; 769 struct gfs2_alloc *al = NULL; 770 int error; 771 772 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 773 &data_blocks, &ind_blocks); 774 775 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS); 776 if (!ghs) 777 return -ENOMEM; 778 779 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); 780 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA); 781 for (qx = 0; qx < num_qd; qx++) { 782 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE, 783 GL_NOCACHE, &ghs[qx]); 784 if (error) 785 goto out; 786 } 787 788 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 789 if (error) 790 goto out; 791 792 for (x = 0; x < num_qd; x++) { 793 offset = qd2offset(qda[x]); 794 if (gfs2_write_alloc_required(ip, offset, 795 sizeof(struct gfs2_quota))) 796 nalloc++; 797 } 798 799 al = gfs2_alloc_get(ip); 800 if (!al) { 801 error = -ENOMEM; 802 goto out_gunlock; 803 } 804 /* 805 * 1 blk for unstuffing inode if stuffed. We add this extra 806 * block to the reservation unconditionally. If the inode 807 * doesn't need unstuffing, the block will be released to the 808 * rgrp since it won't be allocated during the transaction 809 */ 810 al->al_requested = 1; 811 /* +3 in the end for unstuffing block, inode size update block 812 * and another block in case quota straddles page boundary and 813 * two blocks need to be updated instead of 1 */ 814 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3; 815 816 if (nalloc) 817 al->al_requested += nalloc * (data_blocks + ind_blocks); 818 error = gfs2_inplace_reserve(ip); 819 if (error) 820 goto out_alloc; 821 822 if (nalloc) 823 blocks += gfs2_rg_blocks(al) + nalloc * ind_blocks + RES_STATFS; 824 825 error = gfs2_trans_begin(sdp, blocks, 0); 826 if (error) 827 goto out_ipres; 828 829 for (x = 0; x < num_qd; x++) { 830 qd = qda[x]; 831 offset = qd2offset(qd); 832 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL); 833 if (error) 834 goto out_end_trans; 835 836 do_qc(qd, -qd->qd_change_sync); 837 } 838 839 error = 0; 840 841 out_end_trans: 842 gfs2_trans_end(sdp); 843 out_ipres: 844 gfs2_inplace_release(ip); 845 out_alloc: 846 gfs2_alloc_put(ip); 847 out_gunlock: 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, NULL, (char *)&q, &pos, sizeof(q)); 869 if (error < 0) 870 return error; 871 872 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb; 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_lvb; 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_alloc *al = ip->i_alloc; 932 unsigned int x; 933 int error = 0; 934 935 gfs2_quota_hold(ip, uid, gid); 936 937 if (capable(CAP_SYS_RESOURCE) || 938 sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 939 return 0; 940 941 sort(al->al_qd, al->al_qd_num, sizeof(struct gfs2_quota_data *), 942 sort_qd, NULL); 943 944 for (x = 0; x < al->al_qd_num; x++) { 945 error = do_glock(al->al_qd[x], NO_FORCE, &al->al_qd_ghs[x]); 946 if (error) 947 break; 948 } 949 950 if (!error) 951 set_bit(GIF_QD_LOCKED, &ip->i_flags); 952 else { 953 while (x--) 954 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]); 955 gfs2_quota_unhold(ip); 956 } 957 958 return error; 959 } 960 961 static int need_sync(struct gfs2_quota_data *qd) 962 { 963 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 964 struct gfs2_tune *gt = &sdp->sd_tune; 965 s64 value; 966 unsigned int num, den; 967 int do_sync = 1; 968 969 if (!qd->qd_qb.qb_limit) 970 return 0; 971 972 spin_lock(&qd_lru_lock); 973 value = qd->qd_change; 974 spin_unlock(&qd_lru_lock); 975 976 spin_lock(>->gt_spin); 977 num = gt->gt_quota_scale_num; 978 den = gt->gt_quota_scale_den; 979 spin_unlock(>->gt_spin); 980 981 if (value < 0) 982 do_sync = 0; 983 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >= 984 (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 985 do_sync = 0; 986 else { 987 value *= gfs2_jindex_size(sdp) * num; 988 value = div_s64(value, den); 989 value += (s64)be64_to_cpu(qd->qd_qb.qb_value); 990 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 991 do_sync = 0; 992 } 993 994 return do_sync; 995 } 996 997 void gfs2_quota_unlock(struct gfs2_inode *ip) 998 { 999 struct gfs2_alloc *al = ip->i_alloc; 1000 struct gfs2_quota_data *qda[4]; 1001 unsigned int count = 0; 1002 unsigned int x; 1003 1004 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) 1005 goto out; 1006 1007 for (x = 0; x < al->al_qd_num; x++) { 1008 struct gfs2_quota_data *qd; 1009 int sync; 1010 1011 qd = al->al_qd[x]; 1012 sync = need_sync(qd); 1013 1014 gfs2_glock_dq_uninit(&al->al_qd_ghs[x]); 1015 1016 if (sync && qd_trylock(qd)) 1017 qda[count++] = qd; 1018 } 1019 1020 if (count) { 1021 do_sync(count, qda); 1022 for (x = 0; x < count; x++) 1023 qd_unlock(qda[x]); 1024 } 1025 1026 out: 1027 gfs2_quota_unhold(ip); 1028 } 1029 1030 #define MAX_LINE 256 1031 1032 static int print_message(struct gfs2_quota_data *qd, char *type) 1033 { 1034 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 1035 1036 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n", 1037 sdp->sd_fsname, type, 1038 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group", 1039 qd->qd_id); 1040 1041 return 0; 1042 } 1043 1044 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid) 1045 { 1046 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1047 struct gfs2_alloc *al = ip->i_alloc; 1048 struct gfs2_quota_data *qd; 1049 s64 value; 1050 unsigned int x; 1051 int error = 0; 1052 1053 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags)) 1054 return 0; 1055 1056 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 1057 return 0; 1058 1059 for (x = 0; x < al->al_qd_num; x++) { 1060 qd = al->al_qd[x]; 1061 1062 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || 1063 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags)))) 1064 continue; 1065 1066 value = (s64)be64_to_cpu(qd->qd_qb.qb_value); 1067 spin_lock(&qd_lru_lock); 1068 value += qd->qd_change; 1069 spin_unlock(&qd_lru_lock); 1070 1071 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) { 1072 print_message(qd, "exceeded"); 1073 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ? 1074 USRQUOTA : GRPQUOTA, qd->qd_id, 1075 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN); 1076 1077 error = -EDQUOT; 1078 break; 1079 } else if (be64_to_cpu(qd->qd_qb.qb_warn) && 1080 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value && 1081 time_after_eq(jiffies, qd->qd_last_warn + 1082 gfs2_tune_get(sdp, 1083 gt_quota_warn_period) * HZ)) { 1084 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ? 1085 USRQUOTA : GRPQUOTA, qd->qd_id, 1086 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN); 1087 error = print_message(qd, "warning"); 1088 qd->qd_last_warn = jiffies; 1089 } 1090 } 1091 1092 return error; 1093 } 1094 1095 void gfs2_quota_change(struct gfs2_inode *ip, s64 change, 1096 u32 uid, u32 gid) 1097 { 1098 struct gfs2_alloc *al = ip->i_alloc; 1099 struct gfs2_quota_data *qd; 1100 unsigned int x; 1101 1102 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change)) 1103 return; 1104 if (ip->i_diskflags & GFS2_DIF_SYSTEM) 1105 return; 1106 1107 for (x = 0; x < al->al_qd_num; x++) { 1108 qd = al->al_qd[x]; 1109 1110 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || 1111 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) { 1112 do_qc(qd, change); 1113 } 1114 } 1115 } 1116 1117 int gfs2_quota_sync(struct super_block *sb, int type, int wait) 1118 { 1119 struct gfs2_sbd *sdp = sb->s_fs_info; 1120 struct gfs2_quota_data **qda; 1121 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync); 1122 unsigned int num_qd; 1123 unsigned int x; 1124 int error = 0; 1125 1126 sdp->sd_quota_sync_gen++; 1127 1128 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); 1129 if (!qda) 1130 return -ENOMEM; 1131 1132 do { 1133 num_qd = 0; 1134 1135 for (;;) { 1136 error = qd_fish(sdp, qda + num_qd); 1137 if (error || !qda[num_qd]) 1138 break; 1139 if (++num_qd == max_qd) 1140 break; 1141 } 1142 1143 if (num_qd) { 1144 if (!error) 1145 error = do_sync(num_qd, qda); 1146 if (!error) 1147 for (x = 0; x < num_qd; x++) 1148 qda[x]->qd_sync_gen = 1149 sdp->sd_quota_sync_gen; 1150 1151 for (x = 0; x < num_qd; x++) 1152 qd_unlock(qda[x]); 1153 } 1154 } while (!error && num_qd == max_qd); 1155 1156 kfree(qda); 1157 1158 return error; 1159 } 1160 1161 static int gfs2_quota_sync_timeo(struct super_block *sb, int type) 1162 { 1163 return gfs2_quota_sync(sb, type, 0); 1164 } 1165 1166 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id) 1167 { 1168 struct gfs2_quota_data *qd; 1169 struct gfs2_holder q_gh; 1170 int error; 1171 1172 error = qd_get(sdp, user, id, &qd); 1173 if (error) 1174 return error; 1175 1176 error = do_glock(qd, FORCE, &q_gh); 1177 if (!error) 1178 gfs2_glock_dq_uninit(&q_gh); 1179 1180 qd_put(qd); 1181 return error; 1182 } 1183 1184 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf) 1185 { 1186 const struct gfs2_quota_change *str = buf; 1187 1188 qc->qc_change = be64_to_cpu(str->qc_change); 1189 qc->qc_flags = be32_to_cpu(str->qc_flags); 1190 qc->qc_id = be32_to_cpu(str->qc_id); 1191 } 1192 1193 int gfs2_quota_init(struct gfs2_sbd *sdp) 1194 { 1195 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 1196 u64 size = i_size_read(sdp->sd_qc_inode); 1197 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift; 1198 unsigned int x, slot = 0; 1199 unsigned int found = 0; 1200 u64 dblock; 1201 u32 extlen = 0; 1202 int error; 1203 1204 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20)) 1205 return -EIO; 1206 1207 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block; 1208 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE); 1209 1210 error = -ENOMEM; 1211 1212 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks, 1213 sizeof(unsigned char *), GFP_NOFS); 1214 if (!sdp->sd_quota_bitmap) 1215 return error; 1216 1217 for (x = 0; x < sdp->sd_quota_chunks; x++) { 1218 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS); 1219 if (!sdp->sd_quota_bitmap[x]) 1220 goto fail; 1221 } 1222 1223 for (x = 0; x < blocks; x++) { 1224 struct buffer_head *bh; 1225 unsigned int y; 1226 1227 if (!extlen) { 1228 int new = 0; 1229 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen); 1230 if (error) 1231 goto fail; 1232 } 1233 error = -EIO; 1234 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); 1235 if (!bh) 1236 goto fail; 1237 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) { 1238 brelse(bh); 1239 goto fail; 1240 } 1241 1242 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; 1243 y++, slot++) { 1244 struct gfs2_quota_change_host qc; 1245 struct gfs2_quota_data *qd; 1246 1247 gfs2_quota_change_in(&qc, bh->b_data + 1248 sizeof(struct gfs2_meta_header) + 1249 y * sizeof(struct gfs2_quota_change)); 1250 if (!qc.qc_change) 1251 continue; 1252 1253 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER), 1254 qc.qc_id, &qd); 1255 if (error) { 1256 brelse(bh); 1257 goto fail; 1258 } 1259 1260 set_bit(QDF_CHANGE, &qd->qd_flags); 1261 qd->qd_change = qc.qc_change; 1262 qd->qd_slot = slot; 1263 qd->qd_slot_count = 1; 1264 1265 spin_lock(&qd_lru_lock); 1266 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1); 1267 list_add(&qd->qd_list, &sdp->sd_quota_list); 1268 atomic_inc(&sdp->sd_quota_count); 1269 spin_unlock(&qd_lru_lock); 1270 1271 found++; 1272 } 1273 1274 brelse(bh); 1275 dblock++; 1276 extlen--; 1277 } 1278 1279 if (found) 1280 fs_info(sdp, "found %u quota changes\n", found); 1281 1282 return 0; 1283 1284 fail: 1285 gfs2_quota_cleanup(sdp); 1286 return error; 1287 } 1288 1289 void gfs2_quota_cleanup(struct gfs2_sbd *sdp) 1290 { 1291 struct list_head *head = &sdp->sd_quota_list; 1292 struct gfs2_quota_data *qd; 1293 unsigned int x; 1294 1295 spin_lock(&qd_lru_lock); 1296 while (!list_empty(head)) { 1297 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list); 1298 1299 if (atomic_read(&qd->qd_count) > 1 || 1300 (atomic_read(&qd->qd_count) && 1301 !test_bit(QDF_CHANGE, &qd->qd_flags))) { 1302 list_move(&qd->qd_list, head); 1303 spin_unlock(&qd_lru_lock); 1304 schedule(); 1305 spin_lock(&qd_lru_lock); 1306 continue; 1307 } 1308 1309 list_del(&qd->qd_list); 1310 /* Also remove if this qd exists in the reclaim list */ 1311 if (!list_empty(&qd->qd_reclaim)) { 1312 list_del_init(&qd->qd_reclaim); 1313 atomic_dec(&qd_lru_count); 1314 } 1315 atomic_dec(&sdp->sd_quota_count); 1316 spin_unlock(&qd_lru_lock); 1317 1318 if (!atomic_read(&qd->qd_count)) { 1319 gfs2_assert_warn(sdp, !qd->qd_change); 1320 gfs2_assert_warn(sdp, !qd->qd_slot_count); 1321 } else 1322 gfs2_assert_warn(sdp, qd->qd_slot_count == 1); 1323 gfs2_assert_warn(sdp, !qd->qd_bh_count); 1324 1325 gfs2_glock_put(qd->qd_gl); 1326 kmem_cache_free(gfs2_quotad_cachep, qd); 1327 1328 spin_lock(&qd_lru_lock); 1329 } 1330 spin_unlock(&qd_lru_lock); 1331 1332 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); 1333 1334 if (sdp->sd_quota_bitmap) { 1335 for (x = 0; x < sdp->sd_quota_chunks; x++) 1336 kfree(sdp->sd_quota_bitmap[x]); 1337 kfree(sdp->sd_quota_bitmap); 1338 } 1339 } 1340 1341 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error) 1342 { 1343 if (error == 0 || error == -EROFS) 1344 return; 1345 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 1346 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error); 1347 } 1348 1349 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg, 1350 int (*fxn)(struct super_block *sb, int type), 1351 unsigned long t, unsigned long *timeo, 1352 unsigned int *new_timeo) 1353 { 1354 if (t >= *timeo) { 1355 int error = fxn(sdp->sd_vfs, 0); 1356 quotad_error(sdp, msg, error); 1357 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ; 1358 } else { 1359 *timeo -= t; 1360 } 1361 } 1362 1363 static void quotad_check_trunc_list(struct gfs2_sbd *sdp) 1364 { 1365 struct gfs2_inode *ip; 1366 1367 while(1) { 1368 ip = NULL; 1369 spin_lock(&sdp->sd_trunc_lock); 1370 if (!list_empty(&sdp->sd_trunc_list)) { 1371 ip = list_entry(sdp->sd_trunc_list.next, 1372 struct gfs2_inode, i_trunc_list); 1373 list_del_init(&ip->i_trunc_list); 1374 } 1375 spin_unlock(&sdp->sd_trunc_lock); 1376 if (ip == NULL) 1377 return; 1378 gfs2_glock_finish_truncate(ip); 1379 } 1380 } 1381 1382 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) { 1383 if (!sdp->sd_statfs_force_sync) { 1384 sdp->sd_statfs_force_sync = 1; 1385 wake_up(&sdp->sd_quota_wait); 1386 } 1387 } 1388 1389 1390 /** 1391 * gfs2_quotad - Write cached quota changes into the quota file 1392 * @sdp: Pointer to GFS2 superblock 1393 * 1394 */ 1395 1396 int gfs2_quotad(void *data) 1397 { 1398 struct gfs2_sbd *sdp = data; 1399 struct gfs2_tune *tune = &sdp->sd_tune; 1400 unsigned long statfs_timeo = 0; 1401 unsigned long quotad_timeo = 0; 1402 unsigned long t = 0; 1403 DEFINE_WAIT(wait); 1404 int empty; 1405 1406 while (!kthread_should_stop()) { 1407 1408 /* Update the master statfs file */ 1409 if (sdp->sd_statfs_force_sync) { 1410 int error = gfs2_statfs_sync(sdp->sd_vfs, 0); 1411 quotad_error(sdp, "statfs", error); 1412 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; 1413 } 1414 else 1415 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t, 1416 &statfs_timeo, 1417 &tune->gt_statfs_quantum); 1418 1419 /* Update quota file */ 1420 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t, 1421 "ad_timeo, &tune->gt_quota_quantum); 1422 1423 /* Check for & recover partially truncated inodes */ 1424 quotad_check_trunc_list(sdp); 1425 1426 if (freezing(current)) 1427 refrigerator(); 1428 t = min(quotad_timeo, statfs_timeo); 1429 1430 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE); 1431 spin_lock(&sdp->sd_trunc_lock); 1432 empty = list_empty(&sdp->sd_trunc_list); 1433 spin_unlock(&sdp->sd_trunc_lock); 1434 if (empty && !sdp->sd_statfs_force_sync) 1435 t -= schedule_timeout(t); 1436 else 1437 t = 0; 1438 finish_wait(&sdp->sd_quota_wait, &wait); 1439 } 1440 1441 return 0; 1442 } 1443 1444 static int gfs2_quota_get_xstate(struct super_block *sb, 1445 struct fs_quota_stat *fqs) 1446 { 1447 struct gfs2_sbd *sdp = sb->s_fs_info; 1448 1449 memset(fqs, 0, sizeof(struct fs_quota_stat)); 1450 fqs->qs_version = FS_QSTAT_VERSION; 1451 1452 switch (sdp->sd_args.ar_quota) { 1453 case GFS2_QUOTA_ON: 1454 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD); 1455 /*FALLTHRU*/ 1456 case GFS2_QUOTA_ACCOUNT: 1457 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT); 1458 break; 1459 case GFS2_QUOTA_OFF: 1460 break; 1461 } 1462 1463 if (sdp->sd_quota_inode) { 1464 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr; 1465 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks; 1466 } 1467 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */ 1468 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */ 1469 fqs->qs_incoredqs = atomic_read(&qd_lru_count); 1470 return 0; 1471 } 1472 1473 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id, 1474 struct fs_disk_quota *fdq) 1475 { 1476 struct gfs2_sbd *sdp = sb->s_fs_info; 1477 struct gfs2_quota_lvb *qlvb; 1478 struct gfs2_quota_data *qd; 1479 struct gfs2_holder q_gh; 1480 int error; 1481 1482 memset(fdq, 0, sizeof(struct fs_disk_quota)); 1483 1484 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1485 return -ESRCH; /* Crazy XFS error code */ 1486 1487 if (type == USRQUOTA) 1488 type = QUOTA_USER; 1489 else if (type == GRPQUOTA) 1490 type = QUOTA_GROUP; 1491 else 1492 return -EINVAL; 1493 1494 error = qd_get(sdp, type, id, &qd); 1495 if (error) 1496 return error; 1497 error = do_glock(qd, FORCE, &q_gh); 1498 if (error) 1499 goto out; 1500 1501 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb; 1502 fdq->d_version = FS_DQUOT_VERSION; 1503 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA; 1504 fdq->d_id = id; 1505 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift; 1506 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift; 1507 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift; 1508 1509 gfs2_glock_dq_uninit(&q_gh); 1510 out: 1511 qd_put(qd); 1512 return error; 1513 } 1514 1515 /* GFS2 only supports a subset of the XFS fields */ 1516 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT) 1517 1518 static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id, 1519 struct fs_disk_quota *fdq) 1520 { 1521 struct gfs2_sbd *sdp = sb->s_fs_info; 1522 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 1523 struct gfs2_quota_data *qd; 1524 struct gfs2_holder q_gh, i_gh; 1525 unsigned int data_blocks, ind_blocks; 1526 unsigned int blocks = 0; 1527 int alloc_required; 1528 struct gfs2_alloc *al; 1529 loff_t offset; 1530 int error; 1531 1532 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1533 return -ESRCH; /* Crazy XFS error code */ 1534 1535 switch(type) { 1536 case USRQUOTA: 1537 type = QUOTA_USER; 1538 if (fdq->d_flags != FS_USER_QUOTA) 1539 return -EINVAL; 1540 break; 1541 case GRPQUOTA: 1542 type = QUOTA_GROUP; 1543 if (fdq->d_flags != FS_GROUP_QUOTA) 1544 return -EINVAL; 1545 break; 1546 default: 1547 return -EINVAL; 1548 } 1549 1550 if (fdq->d_fieldmask & ~GFS2_FIELDMASK) 1551 return -EINVAL; 1552 if (fdq->d_id != id) 1553 return -EINVAL; 1554 1555 error = qd_get(sdp, type, id, &qd); 1556 if (error) 1557 return error; 1558 1559 mutex_lock(&ip->i_inode.i_mutex); 1560 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh); 1561 if (error) 1562 goto out_put; 1563 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1564 if (error) 1565 goto out_q; 1566 1567 /* Check for existing entry, if none then alloc new blocks */ 1568 error = update_qd(sdp, qd); 1569 if (error) 1570 goto out_i; 1571 1572 /* If nothing has changed, this is a no-op */ 1573 if ((fdq->d_fieldmask & FS_DQ_BSOFT) && 1574 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn))) 1575 fdq->d_fieldmask ^= FS_DQ_BSOFT; 1576 1577 if ((fdq->d_fieldmask & FS_DQ_BHARD) && 1578 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit))) 1579 fdq->d_fieldmask ^= FS_DQ_BHARD; 1580 1581 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) && 1582 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value))) 1583 fdq->d_fieldmask ^= FS_DQ_BCOUNT; 1584 1585 if (fdq->d_fieldmask == 0) 1586 goto out_i; 1587 1588 offset = qd2offset(qd); 1589 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota)); 1590 if (alloc_required) { 1591 al = gfs2_alloc_get(ip); 1592 if (al == NULL) 1593 goto out_i; 1594 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 1595 &data_blocks, &ind_blocks); 1596 blocks = al->al_requested = 1 + data_blocks + ind_blocks; 1597 error = gfs2_inplace_reserve(ip); 1598 if (error) 1599 goto out_alloc; 1600 blocks += gfs2_rg_blocks(al); 1601 } 1602 1603 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 1, 0); 1604 if (error) 1605 goto out_release; 1606 1607 /* Apply changes */ 1608 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq); 1609 1610 gfs2_trans_end(sdp); 1611 out_release: 1612 if (alloc_required) { 1613 gfs2_inplace_release(ip); 1614 out_alloc: 1615 gfs2_alloc_put(ip); 1616 } 1617 out_i: 1618 gfs2_glock_dq_uninit(&i_gh); 1619 out_q: 1620 gfs2_glock_dq_uninit(&q_gh); 1621 out_put: 1622 mutex_unlock(&ip->i_inode.i_mutex); 1623 qd_put(qd); 1624 return error; 1625 } 1626 1627 const struct quotactl_ops gfs2_quotactl_ops = { 1628 .quota_sync = gfs2_quota_sync, 1629 .get_xstate = gfs2_quota_get_xstate, 1630 .get_dqblk = gfs2_get_dqblk, 1631 .set_dqblk = gfs2_set_dqblk, 1632 }; 1633