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_qadata *qa = ip->i_qadata; 498 struct gfs2_quota_data **qd = qa->qa_qd; 499 int error; 500 501 if (gfs2_assert_warn(sdp, !qa->qa_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 qa->qa_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 qa->qa_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 qa->qa_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 qa->qa_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_qadata *qa = ip->i_qadata; 546 unsigned int x; 547 548 gfs2_assert_warn(sdp, !test_bit(GIF_QD_LOCKED, &ip->i_flags)); 549 550 for (x = 0; x < qa->qa_qd_num; x++) { 551 qdsb_put(qa->qa_qd[x]); 552 qa->qa_qd[x] = NULL; 553 } 554 qa->qa_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; 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 err = gfs2_unstuff_dinode(ip, NULL); 650 if (err) 651 return err; 652 } 653 654 memset(&q, 0, sizeof(struct gfs2_quota)); 655 err = gfs2_internal_read(ip, NULL, (char *)&q, &loc, sizeof(q)); 656 if (err < 0) 657 return err; 658 659 err = -EIO; 660 qp = &q; 661 qp->qu_value = be64_to_cpu(qp->qu_value); 662 qp->qu_value += change; 663 qp->qu_value = cpu_to_be64(qp->qu_value); 664 qd->qd_qb.qb_value = qp->qu_value; 665 if (fdq) { 666 if (fdq->d_fieldmask & FS_DQ_BSOFT) { 667 qp->qu_warn = cpu_to_be64(fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift); 668 qd->qd_qb.qb_warn = qp->qu_warn; 669 } 670 if (fdq->d_fieldmask & FS_DQ_BHARD) { 671 qp->qu_limit = cpu_to_be64(fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift); 672 qd->qd_qb.qb_limit = qp->qu_limit; 673 } 674 if (fdq->d_fieldmask & FS_DQ_BCOUNT) { 675 qp->qu_value = cpu_to_be64(fdq->d_bcount >> sdp->sd_fsb2bb_shift); 676 qd->qd_qb.qb_value = qp->qu_value; 677 } 678 } 679 680 /* Write the quota into the quota file on disk */ 681 ptr = qp; 682 nbytes = sizeof(struct gfs2_quota); 683 get_a_page: 684 page = find_or_create_page(mapping, index, GFP_NOFS); 685 if (!page) 686 return -ENOMEM; 687 688 blocksize = inode->i_sb->s_blocksize; 689 iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 690 691 if (!page_has_buffers(page)) 692 create_empty_buffers(page, blocksize, 0); 693 694 bh = page_buffers(page); 695 pos = blocksize; 696 while (offset >= pos) { 697 bh = bh->b_this_page; 698 iblock++; 699 pos += blocksize; 700 } 701 702 if (!buffer_mapped(bh)) { 703 gfs2_block_map(inode, iblock, bh, 1); 704 if (!buffer_mapped(bh)) 705 goto unlock_out; 706 /* If it's a newly allocated disk block for quota, zero it */ 707 if (buffer_new(bh)) 708 zero_user(page, pos - blocksize, bh->b_size); 709 } 710 711 if (PageUptodate(page)) 712 set_buffer_uptodate(bh); 713 714 if (!buffer_uptodate(bh)) { 715 ll_rw_block(READ | REQ_META, 1, &bh); 716 wait_on_buffer(bh); 717 if (!buffer_uptodate(bh)) 718 goto unlock_out; 719 } 720 721 gfs2_trans_add_bh(ip->i_gl, bh, 0); 722 723 kaddr = kmap_atomic(page); 724 if (offset + sizeof(struct gfs2_quota) > PAGE_CACHE_SIZE) 725 nbytes = PAGE_CACHE_SIZE - offset; 726 memcpy(kaddr + offset, ptr, nbytes); 727 flush_dcache_page(page); 728 kunmap_atomic(kaddr); 729 unlock_page(page); 730 page_cache_release(page); 731 732 /* If quota straddles page boundary, we need to update the rest of the 733 * quota at the beginning of the next page */ 734 if ((offset + sizeof(struct gfs2_quota)) > PAGE_CACHE_SIZE) { 735 ptr = ptr + nbytes; 736 nbytes = sizeof(struct gfs2_quota) - nbytes; 737 offset = 0; 738 index++; 739 goto get_a_page; 740 } 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 mark_inode_dirty(inode); 747 return err; 748 749 unlock_out: 750 unlock_page(page); 751 page_cache_release(page); 752 return err; 753 } 754 755 static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda) 756 { 757 struct gfs2_sbd *sdp = (*qda)->qd_gl->gl_sbd; 758 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 759 unsigned int data_blocks, ind_blocks; 760 struct gfs2_holder *ghs, i_gh; 761 unsigned int qx, x; 762 struct gfs2_quota_data *qd; 763 loff_t offset; 764 unsigned int nalloc = 0, blocks; 765 int error; 766 767 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 768 &data_blocks, &ind_blocks); 769 770 ghs = kcalloc(num_qd, sizeof(struct gfs2_holder), GFP_NOFS); 771 if (!ghs) 772 return -ENOMEM; 773 774 sort(qda, num_qd, sizeof(struct gfs2_quota_data *), sort_qd, NULL); 775 mutex_lock_nested(&ip->i_inode.i_mutex, I_MUTEX_QUOTA); 776 for (qx = 0; qx < num_qd; qx++) { 777 error = gfs2_glock_nq_init(qda[qx]->qd_gl, LM_ST_EXCLUSIVE, 778 GL_NOCACHE, &ghs[qx]); 779 if (error) 780 goto out; 781 } 782 783 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 784 if (error) 785 goto out; 786 787 for (x = 0; x < num_qd; x++) { 788 offset = qd2offset(qda[x]); 789 if (gfs2_write_alloc_required(ip, offset, 790 sizeof(struct gfs2_quota))) 791 nalloc++; 792 } 793 794 /* 795 * 1 blk for unstuffing inode if stuffed. We add this extra 796 * block to the reservation unconditionally. If the inode 797 * doesn't need unstuffing, the block will be released to the 798 * rgrp since it won't be allocated during the transaction 799 */ 800 /* +3 in the end for unstuffing block, inode size update block 801 * and another block in case quota straddles page boundary and 802 * two blocks need to be updated instead of 1 */ 803 blocks = num_qd * data_blocks + RES_DINODE + num_qd + 3; 804 805 error = gfs2_inplace_reserve(ip, 1 + 806 (nalloc * (data_blocks + ind_blocks))); 807 if (error) 808 goto out_alloc; 809 810 if (nalloc) 811 blocks += gfs2_rg_blocks(ip) + nalloc * ind_blocks + RES_STATFS; 812 813 error = gfs2_trans_begin(sdp, blocks, 0); 814 if (error) 815 goto out_ipres; 816 817 for (x = 0; x < num_qd; x++) { 818 qd = qda[x]; 819 offset = qd2offset(qd); 820 error = gfs2_adjust_quota(ip, offset, qd->qd_change_sync, qd, NULL); 821 if (error) 822 goto out_end_trans; 823 824 do_qc(qd, -qd->qd_change_sync); 825 set_bit(QDF_REFRESH, &qd->qd_flags); 826 } 827 828 error = 0; 829 830 out_end_trans: 831 gfs2_trans_end(sdp); 832 out_ipres: 833 gfs2_inplace_release(ip); 834 out_alloc: 835 gfs2_glock_dq_uninit(&i_gh); 836 out: 837 while (qx--) 838 gfs2_glock_dq_uninit(&ghs[qx]); 839 mutex_unlock(&ip->i_inode.i_mutex); 840 kfree(ghs); 841 gfs2_log_flush(ip->i_gl->gl_sbd, ip->i_gl); 842 return error; 843 } 844 845 static int update_qd(struct gfs2_sbd *sdp, struct gfs2_quota_data *qd) 846 { 847 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 848 struct gfs2_quota q; 849 struct gfs2_quota_lvb *qlvb; 850 loff_t pos; 851 int error; 852 853 memset(&q, 0, sizeof(struct gfs2_quota)); 854 pos = qd2offset(qd); 855 error = gfs2_internal_read(ip, NULL, (char *)&q, &pos, sizeof(q)); 856 if (error < 0) 857 return error; 858 859 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb; 860 qlvb->qb_magic = cpu_to_be32(GFS2_MAGIC); 861 qlvb->__pad = 0; 862 qlvb->qb_limit = q.qu_limit; 863 qlvb->qb_warn = q.qu_warn; 864 qlvb->qb_value = q.qu_value; 865 qd->qd_qb = *qlvb; 866 867 return 0; 868 } 869 870 static int do_glock(struct gfs2_quota_data *qd, int force_refresh, 871 struct gfs2_holder *q_gh) 872 { 873 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 874 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 875 struct gfs2_holder i_gh; 876 int error; 877 878 restart: 879 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_SHARED, 0, q_gh); 880 if (error) 881 return error; 882 883 qd->qd_qb = *(struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb; 884 885 if (force_refresh || qd->qd_qb.qb_magic != cpu_to_be32(GFS2_MAGIC)) { 886 gfs2_glock_dq_uninit(q_gh); 887 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 888 GL_NOCACHE, q_gh); 889 if (error) 890 return error; 891 892 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); 893 if (error) 894 goto fail; 895 896 error = update_qd(sdp, qd); 897 if (error) 898 goto fail_gunlock; 899 900 gfs2_glock_dq_uninit(&i_gh); 901 gfs2_glock_dq_uninit(q_gh); 902 force_refresh = 0; 903 goto restart; 904 } 905 906 return 0; 907 908 fail_gunlock: 909 gfs2_glock_dq_uninit(&i_gh); 910 fail: 911 gfs2_glock_dq_uninit(q_gh); 912 return error; 913 } 914 915 int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid) 916 { 917 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 918 struct gfs2_qadata *qa = ip->i_qadata; 919 struct gfs2_quota_data *qd; 920 unsigned int x; 921 int error = 0; 922 923 error = gfs2_quota_hold(ip, uid, gid); 924 if (error) 925 return error; 926 927 if (capable(CAP_SYS_RESOURCE) || 928 sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 929 return 0; 930 931 sort(qa->qa_qd, qa->qa_qd_num, sizeof(struct gfs2_quota_data *), 932 sort_qd, NULL); 933 934 for (x = 0; x < qa->qa_qd_num; x++) { 935 int force = NO_FORCE; 936 qd = qa->qa_qd[x]; 937 if (test_and_clear_bit(QDF_REFRESH, &qd->qd_flags)) 938 force = FORCE; 939 error = do_glock(qd, force, &qa->qa_qd_ghs[x]); 940 if (error) 941 break; 942 } 943 944 if (!error) 945 set_bit(GIF_QD_LOCKED, &ip->i_flags); 946 else { 947 while (x--) 948 gfs2_glock_dq_uninit(&qa->qa_qd_ghs[x]); 949 gfs2_quota_unhold(ip); 950 } 951 952 return error; 953 } 954 955 static int need_sync(struct gfs2_quota_data *qd) 956 { 957 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 958 struct gfs2_tune *gt = &sdp->sd_tune; 959 s64 value; 960 unsigned int num, den; 961 int do_sync = 1; 962 963 if (!qd->qd_qb.qb_limit) 964 return 0; 965 966 spin_lock(&qd_lru_lock); 967 value = qd->qd_change; 968 spin_unlock(&qd_lru_lock); 969 970 spin_lock(>->gt_spin); 971 num = gt->gt_quota_scale_num; 972 den = gt->gt_quota_scale_den; 973 spin_unlock(>->gt_spin); 974 975 if (value < 0) 976 do_sync = 0; 977 else if ((s64)be64_to_cpu(qd->qd_qb.qb_value) >= 978 (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 979 do_sync = 0; 980 else { 981 value *= gfs2_jindex_size(sdp) * num; 982 value = div_s64(value, den); 983 value += (s64)be64_to_cpu(qd->qd_qb.qb_value); 984 if (value < (s64)be64_to_cpu(qd->qd_qb.qb_limit)) 985 do_sync = 0; 986 } 987 988 return do_sync; 989 } 990 991 void gfs2_quota_unlock(struct gfs2_inode *ip) 992 { 993 struct gfs2_qadata *qa = ip->i_qadata; 994 struct gfs2_quota_data *qda[4]; 995 unsigned int count = 0; 996 unsigned int x; 997 998 if (!test_and_clear_bit(GIF_QD_LOCKED, &ip->i_flags)) 999 goto out; 1000 1001 for (x = 0; x < qa->qa_qd_num; x++) { 1002 struct gfs2_quota_data *qd; 1003 int sync; 1004 1005 qd = qa->qa_qd[x]; 1006 sync = need_sync(qd); 1007 1008 gfs2_glock_dq_uninit(&qa->qa_qd_ghs[x]); 1009 1010 if (sync && qd_trylock(qd)) 1011 qda[count++] = qd; 1012 } 1013 1014 if (count) { 1015 do_sync(count, qda); 1016 for (x = 0; x < count; x++) 1017 qd_unlock(qda[x]); 1018 } 1019 1020 out: 1021 gfs2_quota_unhold(ip); 1022 } 1023 1024 #define MAX_LINE 256 1025 1026 static int print_message(struct gfs2_quota_data *qd, char *type) 1027 { 1028 struct gfs2_sbd *sdp = qd->qd_gl->gl_sbd; 1029 1030 printk(KERN_INFO "GFS2: fsid=%s: quota %s for %s %u\n", 1031 sdp->sd_fsname, type, 1032 (test_bit(QDF_USER, &qd->qd_flags)) ? "user" : "group", 1033 qd->qd_id); 1034 1035 return 0; 1036 } 1037 1038 int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid) 1039 { 1040 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); 1041 struct gfs2_qadata *qa = ip->i_qadata; 1042 struct gfs2_quota_data *qd; 1043 s64 value; 1044 unsigned int x; 1045 int error = 0; 1046 1047 if (!test_bit(GIF_QD_LOCKED, &ip->i_flags)) 1048 return 0; 1049 1050 if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON) 1051 return 0; 1052 1053 for (x = 0; x < qa->qa_qd_num; x++) { 1054 qd = qa->qa_qd[x]; 1055 1056 if (!((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || 1057 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags)))) 1058 continue; 1059 1060 value = (s64)be64_to_cpu(qd->qd_qb.qb_value); 1061 spin_lock(&qd_lru_lock); 1062 value += qd->qd_change; 1063 spin_unlock(&qd_lru_lock); 1064 1065 if (be64_to_cpu(qd->qd_qb.qb_limit) && (s64)be64_to_cpu(qd->qd_qb.qb_limit) < value) { 1066 print_message(qd, "exceeded"); 1067 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ? 1068 USRQUOTA : GRPQUOTA, qd->qd_id, 1069 sdp->sd_vfs->s_dev, QUOTA_NL_BHARDWARN); 1070 1071 error = -EDQUOT; 1072 break; 1073 } else if (be64_to_cpu(qd->qd_qb.qb_warn) && 1074 (s64)be64_to_cpu(qd->qd_qb.qb_warn) < value && 1075 time_after_eq(jiffies, qd->qd_last_warn + 1076 gfs2_tune_get(sdp, 1077 gt_quota_warn_period) * HZ)) { 1078 quota_send_warning(test_bit(QDF_USER, &qd->qd_flags) ? 1079 USRQUOTA : GRPQUOTA, qd->qd_id, 1080 sdp->sd_vfs->s_dev, QUOTA_NL_BSOFTWARN); 1081 error = print_message(qd, "warning"); 1082 qd->qd_last_warn = jiffies; 1083 } 1084 } 1085 1086 return error; 1087 } 1088 1089 void gfs2_quota_change(struct gfs2_inode *ip, s64 change, 1090 u32 uid, u32 gid) 1091 { 1092 struct gfs2_qadata *qa = ip->i_qadata; 1093 struct gfs2_quota_data *qd; 1094 unsigned int x; 1095 1096 if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), change)) 1097 return; 1098 if (ip->i_diskflags & GFS2_DIF_SYSTEM) 1099 return; 1100 1101 for (x = 0; x < qa->qa_qd_num; x++) { 1102 qd = qa->qa_qd[x]; 1103 1104 if ((qd->qd_id == uid && test_bit(QDF_USER, &qd->qd_flags)) || 1105 (qd->qd_id == gid && !test_bit(QDF_USER, &qd->qd_flags))) { 1106 do_qc(qd, change); 1107 } 1108 } 1109 } 1110 1111 int gfs2_quota_sync(struct super_block *sb, int type, int wait) 1112 { 1113 struct gfs2_sbd *sdp = sb->s_fs_info; 1114 struct gfs2_quota_data **qda; 1115 unsigned int max_qd = gfs2_tune_get(sdp, gt_quota_simul_sync); 1116 unsigned int num_qd; 1117 unsigned int x; 1118 int error = 0; 1119 1120 sdp->sd_quota_sync_gen++; 1121 1122 qda = kcalloc(max_qd, sizeof(struct gfs2_quota_data *), GFP_KERNEL); 1123 if (!qda) 1124 return -ENOMEM; 1125 1126 do { 1127 num_qd = 0; 1128 1129 for (;;) { 1130 error = qd_fish(sdp, qda + num_qd); 1131 if (error || !qda[num_qd]) 1132 break; 1133 if (++num_qd == max_qd) 1134 break; 1135 } 1136 1137 if (num_qd) { 1138 if (!error) 1139 error = do_sync(num_qd, qda); 1140 if (!error) 1141 for (x = 0; x < num_qd; x++) 1142 qda[x]->qd_sync_gen = 1143 sdp->sd_quota_sync_gen; 1144 1145 for (x = 0; x < num_qd; x++) 1146 qd_unlock(qda[x]); 1147 } 1148 } while (!error && num_qd == max_qd); 1149 1150 kfree(qda); 1151 1152 return error; 1153 } 1154 1155 static int gfs2_quota_sync_timeo(struct super_block *sb, int type) 1156 { 1157 return gfs2_quota_sync(sb, type, 0); 1158 } 1159 1160 int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id) 1161 { 1162 struct gfs2_quota_data *qd; 1163 struct gfs2_holder q_gh; 1164 int error; 1165 1166 error = qd_get(sdp, user, id, &qd); 1167 if (error) 1168 return error; 1169 1170 error = do_glock(qd, FORCE, &q_gh); 1171 if (!error) 1172 gfs2_glock_dq_uninit(&q_gh); 1173 1174 qd_put(qd); 1175 return error; 1176 } 1177 1178 static void gfs2_quota_change_in(struct gfs2_quota_change_host *qc, const void *buf) 1179 { 1180 const struct gfs2_quota_change *str = buf; 1181 1182 qc->qc_change = be64_to_cpu(str->qc_change); 1183 qc->qc_flags = be32_to_cpu(str->qc_flags); 1184 qc->qc_id = be32_to_cpu(str->qc_id); 1185 } 1186 1187 int gfs2_quota_init(struct gfs2_sbd *sdp) 1188 { 1189 struct gfs2_inode *ip = GFS2_I(sdp->sd_qc_inode); 1190 u64 size = i_size_read(sdp->sd_qc_inode); 1191 unsigned int blocks = size >> sdp->sd_sb.sb_bsize_shift; 1192 unsigned int x, slot = 0; 1193 unsigned int found = 0; 1194 u64 dblock; 1195 u32 extlen = 0; 1196 int error; 1197 1198 if (gfs2_check_internal_file_size(sdp->sd_qc_inode, 1, 64 << 20)) 1199 return -EIO; 1200 1201 sdp->sd_quota_slots = blocks * sdp->sd_qc_per_block; 1202 sdp->sd_quota_chunks = DIV_ROUND_UP(sdp->sd_quota_slots, 8 * PAGE_SIZE); 1203 1204 error = -ENOMEM; 1205 1206 sdp->sd_quota_bitmap = kcalloc(sdp->sd_quota_chunks, 1207 sizeof(unsigned char *), GFP_NOFS); 1208 if (!sdp->sd_quota_bitmap) 1209 return error; 1210 1211 for (x = 0; x < sdp->sd_quota_chunks; x++) { 1212 sdp->sd_quota_bitmap[x] = kzalloc(PAGE_SIZE, GFP_NOFS); 1213 if (!sdp->sd_quota_bitmap[x]) 1214 goto fail; 1215 } 1216 1217 for (x = 0; x < blocks; x++) { 1218 struct buffer_head *bh; 1219 unsigned int y; 1220 1221 if (!extlen) { 1222 int new = 0; 1223 error = gfs2_extent_map(&ip->i_inode, x, &new, &dblock, &extlen); 1224 if (error) 1225 goto fail; 1226 } 1227 error = -EIO; 1228 bh = gfs2_meta_ra(ip->i_gl, dblock, extlen); 1229 if (!bh) 1230 goto fail; 1231 if (gfs2_metatype_check(sdp, bh, GFS2_METATYPE_QC)) { 1232 brelse(bh); 1233 goto fail; 1234 } 1235 1236 for (y = 0; y < sdp->sd_qc_per_block && slot < sdp->sd_quota_slots; 1237 y++, slot++) { 1238 struct gfs2_quota_change_host qc; 1239 struct gfs2_quota_data *qd; 1240 1241 gfs2_quota_change_in(&qc, bh->b_data + 1242 sizeof(struct gfs2_meta_header) + 1243 y * sizeof(struct gfs2_quota_change)); 1244 if (!qc.qc_change) 1245 continue; 1246 1247 error = qd_alloc(sdp, (qc.qc_flags & GFS2_QCF_USER), 1248 qc.qc_id, &qd); 1249 if (error) { 1250 brelse(bh); 1251 goto fail; 1252 } 1253 1254 set_bit(QDF_CHANGE, &qd->qd_flags); 1255 qd->qd_change = qc.qc_change; 1256 qd->qd_slot = slot; 1257 qd->qd_slot_count = 1; 1258 1259 spin_lock(&qd_lru_lock); 1260 gfs2_icbit_munge(sdp, sdp->sd_quota_bitmap, slot, 1); 1261 list_add(&qd->qd_list, &sdp->sd_quota_list); 1262 atomic_inc(&sdp->sd_quota_count); 1263 spin_unlock(&qd_lru_lock); 1264 1265 found++; 1266 } 1267 1268 brelse(bh); 1269 dblock++; 1270 extlen--; 1271 } 1272 1273 if (found) 1274 fs_info(sdp, "found %u quota changes\n", found); 1275 1276 return 0; 1277 1278 fail: 1279 gfs2_quota_cleanup(sdp); 1280 return error; 1281 } 1282 1283 void gfs2_quota_cleanup(struct gfs2_sbd *sdp) 1284 { 1285 struct list_head *head = &sdp->sd_quota_list; 1286 struct gfs2_quota_data *qd; 1287 unsigned int x; 1288 1289 spin_lock(&qd_lru_lock); 1290 while (!list_empty(head)) { 1291 qd = list_entry(head->prev, struct gfs2_quota_data, qd_list); 1292 1293 if (atomic_read(&qd->qd_count) > 1 || 1294 (atomic_read(&qd->qd_count) && 1295 !test_bit(QDF_CHANGE, &qd->qd_flags))) { 1296 list_move(&qd->qd_list, head); 1297 spin_unlock(&qd_lru_lock); 1298 schedule(); 1299 spin_lock(&qd_lru_lock); 1300 continue; 1301 } 1302 1303 list_del(&qd->qd_list); 1304 /* Also remove if this qd exists in the reclaim list */ 1305 if (!list_empty(&qd->qd_reclaim)) { 1306 list_del_init(&qd->qd_reclaim); 1307 atomic_dec(&qd_lru_count); 1308 } 1309 atomic_dec(&sdp->sd_quota_count); 1310 spin_unlock(&qd_lru_lock); 1311 1312 if (!atomic_read(&qd->qd_count)) { 1313 gfs2_assert_warn(sdp, !qd->qd_change); 1314 gfs2_assert_warn(sdp, !qd->qd_slot_count); 1315 } else 1316 gfs2_assert_warn(sdp, qd->qd_slot_count == 1); 1317 gfs2_assert_warn(sdp, !qd->qd_bh_count); 1318 1319 gfs2_glock_put(qd->qd_gl); 1320 kmem_cache_free(gfs2_quotad_cachep, qd); 1321 1322 spin_lock(&qd_lru_lock); 1323 } 1324 spin_unlock(&qd_lru_lock); 1325 1326 gfs2_assert_warn(sdp, !atomic_read(&sdp->sd_quota_count)); 1327 1328 if (sdp->sd_quota_bitmap) { 1329 for (x = 0; x < sdp->sd_quota_chunks; x++) 1330 kfree(sdp->sd_quota_bitmap[x]); 1331 kfree(sdp->sd_quota_bitmap); 1332 } 1333 } 1334 1335 static void quotad_error(struct gfs2_sbd *sdp, const char *msg, int error) 1336 { 1337 if (error == 0 || error == -EROFS) 1338 return; 1339 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) 1340 fs_err(sdp, "gfs2_quotad: %s error %d\n", msg, error); 1341 } 1342 1343 static void quotad_check_timeo(struct gfs2_sbd *sdp, const char *msg, 1344 int (*fxn)(struct super_block *sb, int type), 1345 unsigned long t, unsigned long *timeo, 1346 unsigned int *new_timeo) 1347 { 1348 if (t >= *timeo) { 1349 int error = fxn(sdp->sd_vfs, 0); 1350 quotad_error(sdp, msg, error); 1351 *timeo = gfs2_tune_get_i(&sdp->sd_tune, new_timeo) * HZ; 1352 } else { 1353 *timeo -= t; 1354 } 1355 } 1356 1357 static void quotad_check_trunc_list(struct gfs2_sbd *sdp) 1358 { 1359 struct gfs2_inode *ip; 1360 1361 while(1) { 1362 ip = NULL; 1363 spin_lock(&sdp->sd_trunc_lock); 1364 if (!list_empty(&sdp->sd_trunc_list)) { 1365 ip = list_entry(sdp->sd_trunc_list.next, 1366 struct gfs2_inode, i_trunc_list); 1367 list_del_init(&ip->i_trunc_list); 1368 } 1369 spin_unlock(&sdp->sd_trunc_lock); 1370 if (ip == NULL) 1371 return; 1372 gfs2_glock_finish_truncate(ip); 1373 } 1374 } 1375 1376 void gfs2_wake_up_statfs(struct gfs2_sbd *sdp) { 1377 if (!sdp->sd_statfs_force_sync) { 1378 sdp->sd_statfs_force_sync = 1; 1379 wake_up(&sdp->sd_quota_wait); 1380 } 1381 } 1382 1383 1384 /** 1385 * gfs2_quotad - Write cached quota changes into the quota file 1386 * @sdp: Pointer to GFS2 superblock 1387 * 1388 */ 1389 1390 int gfs2_quotad(void *data) 1391 { 1392 struct gfs2_sbd *sdp = data; 1393 struct gfs2_tune *tune = &sdp->sd_tune; 1394 unsigned long statfs_timeo = 0; 1395 unsigned long quotad_timeo = 0; 1396 unsigned long t = 0; 1397 DEFINE_WAIT(wait); 1398 int empty; 1399 1400 while (!kthread_should_stop()) { 1401 1402 /* Update the master statfs file */ 1403 if (sdp->sd_statfs_force_sync) { 1404 int error = gfs2_statfs_sync(sdp->sd_vfs, 0); 1405 quotad_error(sdp, "statfs", error); 1406 statfs_timeo = gfs2_tune_get(sdp, gt_statfs_quantum) * HZ; 1407 } 1408 else 1409 quotad_check_timeo(sdp, "statfs", gfs2_statfs_sync, t, 1410 &statfs_timeo, 1411 &tune->gt_statfs_quantum); 1412 1413 /* Update quota file */ 1414 quotad_check_timeo(sdp, "sync", gfs2_quota_sync_timeo, t, 1415 "ad_timeo, &tune->gt_quota_quantum); 1416 1417 /* Check for & recover partially truncated inodes */ 1418 quotad_check_trunc_list(sdp); 1419 1420 try_to_freeze(); 1421 1422 t = min(quotad_timeo, statfs_timeo); 1423 1424 prepare_to_wait(&sdp->sd_quota_wait, &wait, TASK_INTERRUPTIBLE); 1425 spin_lock(&sdp->sd_trunc_lock); 1426 empty = list_empty(&sdp->sd_trunc_list); 1427 spin_unlock(&sdp->sd_trunc_lock); 1428 if (empty && !sdp->sd_statfs_force_sync) 1429 t -= schedule_timeout(t); 1430 else 1431 t = 0; 1432 finish_wait(&sdp->sd_quota_wait, &wait); 1433 } 1434 1435 return 0; 1436 } 1437 1438 static int gfs2_quota_get_xstate(struct super_block *sb, 1439 struct fs_quota_stat *fqs) 1440 { 1441 struct gfs2_sbd *sdp = sb->s_fs_info; 1442 1443 memset(fqs, 0, sizeof(struct fs_quota_stat)); 1444 fqs->qs_version = FS_QSTAT_VERSION; 1445 1446 switch (sdp->sd_args.ar_quota) { 1447 case GFS2_QUOTA_ON: 1448 fqs->qs_flags |= (FS_QUOTA_UDQ_ENFD | FS_QUOTA_GDQ_ENFD); 1449 /*FALLTHRU*/ 1450 case GFS2_QUOTA_ACCOUNT: 1451 fqs->qs_flags |= (FS_QUOTA_UDQ_ACCT | FS_QUOTA_GDQ_ACCT); 1452 break; 1453 case GFS2_QUOTA_OFF: 1454 break; 1455 } 1456 1457 if (sdp->sd_quota_inode) { 1458 fqs->qs_uquota.qfs_ino = GFS2_I(sdp->sd_quota_inode)->i_no_addr; 1459 fqs->qs_uquota.qfs_nblks = sdp->sd_quota_inode->i_blocks; 1460 } 1461 fqs->qs_uquota.qfs_nextents = 1; /* unsupported */ 1462 fqs->qs_gquota = fqs->qs_uquota; /* its the same inode in both cases */ 1463 fqs->qs_incoredqs = atomic_read(&qd_lru_count); 1464 return 0; 1465 } 1466 1467 static int gfs2_get_dqblk(struct super_block *sb, int type, qid_t id, 1468 struct fs_disk_quota *fdq) 1469 { 1470 struct gfs2_sbd *sdp = sb->s_fs_info; 1471 struct gfs2_quota_lvb *qlvb; 1472 struct gfs2_quota_data *qd; 1473 struct gfs2_holder q_gh; 1474 int error; 1475 1476 memset(fdq, 0, sizeof(struct fs_disk_quota)); 1477 1478 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1479 return -ESRCH; /* Crazy XFS error code */ 1480 1481 if (type == USRQUOTA) 1482 type = QUOTA_USER; 1483 else if (type == GRPQUOTA) 1484 type = QUOTA_GROUP; 1485 else 1486 return -EINVAL; 1487 1488 error = qd_get(sdp, type, id, &qd); 1489 if (error) 1490 return error; 1491 error = do_glock(qd, FORCE, &q_gh); 1492 if (error) 1493 goto out; 1494 1495 qlvb = (struct gfs2_quota_lvb *)qd->qd_gl->gl_lvb; 1496 fdq->d_version = FS_DQUOT_VERSION; 1497 fdq->d_flags = (type == QUOTA_USER) ? FS_USER_QUOTA : FS_GROUP_QUOTA; 1498 fdq->d_id = id; 1499 fdq->d_blk_hardlimit = be64_to_cpu(qlvb->qb_limit) << sdp->sd_fsb2bb_shift; 1500 fdq->d_blk_softlimit = be64_to_cpu(qlvb->qb_warn) << sdp->sd_fsb2bb_shift; 1501 fdq->d_bcount = be64_to_cpu(qlvb->qb_value) << sdp->sd_fsb2bb_shift; 1502 1503 gfs2_glock_dq_uninit(&q_gh); 1504 out: 1505 qd_put(qd); 1506 return error; 1507 } 1508 1509 /* GFS2 only supports a subset of the XFS fields */ 1510 #define GFS2_FIELDMASK (FS_DQ_BSOFT|FS_DQ_BHARD|FS_DQ_BCOUNT) 1511 1512 static int gfs2_set_dqblk(struct super_block *sb, int type, qid_t id, 1513 struct fs_disk_quota *fdq) 1514 { 1515 struct gfs2_sbd *sdp = sb->s_fs_info; 1516 struct gfs2_inode *ip = GFS2_I(sdp->sd_quota_inode); 1517 struct gfs2_quota_data *qd; 1518 struct gfs2_holder q_gh, i_gh; 1519 unsigned int data_blocks, ind_blocks; 1520 unsigned int blocks = 0; 1521 int alloc_required; 1522 loff_t offset; 1523 int error; 1524 1525 if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF) 1526 return -ESRCH; /* Crazy XFS error code */ 1527 1528 switch(type) { 1529 case USRQUOTA: 1530 type = QUOTA_USER; 1531 if (fdq->d_flags != FS_USER_QUOTA) 1532 return -EINVAL; 1533 break; 1534 case GRPQUOTA: 1535 type = QUOTA_GROUP; 1536 if (fdq->d_flags != FS_GROUP_QUOTA) 1537 return -EINVAL; 1538 break; 1539 default: 1540 return -EINVAL; 1541 } 1542 1543 if (fdq->d_fieldmask & ~GFS2_FIELDMASK) 1544 return -EINVAL; 1545 if (fdq->d_id != id) 1546 return -EINVAL; 1547 1548 error = qd_get(sdp, type, id, &qd); 1549 if (error) 1550 return error; 1551 1552 mutex_lock(&ip->i_inode.i_mutex); 1553 error = gfs2_glock_nq_init(qd->qd_gl, LM_ST_EXCLUSIVE, 0, &q_gh); 1554 if (error) 1555 goto out_put; 1556 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 1557 if (error) 1558 goto out_q; 1559 1560 /* Check for existing entry, if none then alloc new blocks */ 1561 error = update_qd(sdp, qd); 1562 if (error) 1563 goto out_i; 1564 1565 /* If nothing has changed, this is a no-op */ 1566 if ((fdq->d_fieldmask & FS_DQ_BSOFT) && 1567 ((fdq->d_blk_softlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_warn))) 1568 fdq->d_fieldmask ^= FS_DQ_BSOFT; 1569 1570 if ((fdq->d_fieldmask & FS_DQ_BHARD) && 1571 ((fdq->d_blk_hardlimit >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_limit))) 1572 fdq->d_fieldmask ^= FS_DQ_BHARD; 1573 1574 if ((fdq->d_fieldmask & FS_DQ_BCOUNT) && 1575 ((fdq->d_bcount >> sdp->sd_fsb2bb_shift) == be64_to_cpu(qd->qd_qb.qb_value))) 1576 fdq->d_fieldmask ^= FS_DQ_BCOUNT; 1577 1578 if (fdq->d_fieldmask == 0) 1579 goto out_i; 1580 1581 offset = qd2offset(qd); 1582 alloc_required = gfs2_write_alloc_required(ip, offset, sizeof(struct gfs2_quota)); 1583 if (gfs2_is_stuffed(ip)) 1584 alloc_required = 1; 1585 if (alloc_required) { 1586 gfs2_write_calc_reserv(ip, sizeof(struct gfs2_quota), 1587 &data_blocks, &ind_blocks); 1588 blocks = 1 + data_blocks + ind_blocks; 1589 error = gfs2_inplace_reserve(ip, blocks); 1590 if (error) 1591 goto out_i; 1592 blocks += gfs2_rg_blocks(ip); 1593 } 1594 1595 /* Some quotas span block boundaries and can update two blocks, 1596 adding an extra block to the transaction to handle such quotas */ 1597 error = gfs2_trans_begin(sdp, blocks + RES_DINODE + 2, 0); 1598 if (error) 1599 goto out_release; 1600 1601 /* Apply changes */ 1602 error = gfs2_adjust_quota(ip, offset, 0, qd, fdq); 1603 1604 gfs2_trans_end(sdp); 1605 out_release: 1606 if (alloc_required) 1607 gfs2_inplace_release(ip); 1608 out_i: 1609 gfs2_glock_dq_uninit(&i_gh); 1610 out_q: 1611 gfs2_glock_dq_uninit(&q_gh); 1612 out_put: 1613 mutex_unlock(&ip->i_inode.i_mutex); 1614 qd_put(qd); 1615 return error; 1616 } 1617 1618 const struct quotactl_ops gfs2_quotactl_ops = { 1619 .quota_sync = gfs2_quota_sync, 1620 .get_xstate = gfs2_quota_get_xstate, 1621 .get_dqblk = gfs2_get_dqblk, 1622 .set_dqblk = gfs2_set_dqblk, 1623 }; 1624