Pileus Git - ~andy/linux/blob - fs/ocfs2/move_extents.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * move_extents.c
   5  *
   6  * Copyright (C) 2011 Oracle.  All rights reserved.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public
  10  * License version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17 #include <linux/fs.h>
  18 #include <linux/types.h>
  19 #include <linux/mount.h>
  20 #include <linux/swap.h>
  21
  22 #include <cluster/masklog.h>
  23
  24 #include "ocfs2.h"
  25 #include "ocfs2_ioctl.h"
  26
  27 #include "alloc.h"
  28 #include "aops.h"
  29 #include "dlmglue.h"
  30 #include "extent_map.h"
  31 #include "inode.h"
  32 #include "journal.h"
  33 #include "suballoc.h"
  34 #include "uptodate.h"
  35 #include "super.h"
  36 #include "dir.h"
  37 #include "buffer_head_io.h"
  38 #include "sysfile.h"
  39 #include "suballoc.h"
  40 #include "refcounttree.h"
  41 #include "move_extents.h"
  42
  43 struct ocfs2_move_extents_context {
  44         struct inode *inode;
  45         struct file *file;
  46         int auto_defrag;
  47         int credits;
  48         u32 new_phys_cpos;
  49         u32 clusters_moved;
  50         u64 refcount_loc;
  51         struct ocfs2_move_extents *range;
  52         struct ocfs2_extent_tree et;
  53         struct ocfs2_alloc_context *meta_ac;
  54         struct ocfs2_alloc_context *data_ac;
  55         struct ocfs2_cached_dealloc_ctxt dealloc;
  56 };
  57
  58 static int __ocfs2_move_extent(handle_t *handle,
  59                                struct ocfs2_move_extents_context *context,
  60                                u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos,
  61                                int ext_flags)
  62 {
  63         int ret = 0, index;
  64         struct inode *inode = context->inode;
  65         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  66         struct ocfs2_extent_rec *rec, replace_rec;
  67         struct ocfs2_path *path = NULL;
  68         struct ocfs2_extent_list *el;
  69         u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci);
  70         u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos);
  71
  72         ret = ocfs2_duplicate_clusters_by_page(handle, context->file, cpos,
  73                                                p_cpos, new_p_cpos, len);
  74         if (ret) {
  75                 mlog_errno(ret);
  76                 goto out;
  77         }
  78
  79         memset(&replace_rec, 0, sizeof(replace_rec));
  80         replace_rec.e_cpos = cpu_to_le32(cpos);
  81         replace_rec.e_leaf_clusters = cpu_to_le16(len);
  82         replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb,
  83                                                                    new_p_cpos));
  84
  85         path = ocfs2_new_path_from_et(&context->et);
  86         if (!path) {
  87                 ret = -ENOMEM;
  88                 mlog_errno(ret);
  89                 goto out;
  90         }
  91
  92         ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos);
  93         if (ret) {
  94                 mlog_errno(ret);
  95                 goto out;
  96         }
  97
  98         el = path_leaf_el(path);
  99
 100         index = ocfs2_search_extent_list(el, cpos);
 101         if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
 102                 ocfs2_error(inode->i_sb,
 103                             "Inode %llu has an extent at cpos %u which can no "
 104                             "longer be found.\n",
 105                             (unsigned long long)ino, cpos);
 106                 ret = -EROFS;
 107                 goto out;
 108         }
 109
 110         rec = &el->l_recs[index];
 111
 112         BUG_ON(ext_flags != rec->e_flags);
 113         /*
 114          * after moving/defraging to new location, the extent is not going
 115          * to be refcounted anymore.
 116          */
 117         replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED;
 118
 119         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
 120                                       context->et.et_root_bh,
 121                                       OCFS2_JOURNAL_ACCESS_WRITE);
 122         if (ret) {
 123                 mlog_errno(ret);
 124                 goto out;
 125         }
 126
 127         ret = ocfs2_split_extent(handle, &context->et, path, index,
 128                                  &replace_rec, context->meta_ac,
 129                                  &context->dealloc);
 130         if (ret) {
 131                 mlog_errno(ret);
 132                 goto out;
 133         }
 134
 135         ocfs2_journal_dirty(handle, context->et.et_root_bh);
 136
 137         context->new_phys_cpos = new_p_cpos;
 138
 139         /*
 140          * need I to append truncate log for old clusters?
 141          */
 142         if (old_blkno) {
 143                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
 144                         ret = ocfs2_decrease_refcount(inode, handle,
 145                                         ocfs2_blocks_to_clusters(osb->sb,
 146                                                                  old_blkno),
 147                                         len, context->meta_ac,
 148                                         &context->dealloc, 1);
 149                 else
 150                         ret = ocfs2_truncate_log_append(osb, handle,
 151                                                         old_blkno, len);
 152         }
 153
 154 out:
 155         return ret;
 156 }
 157
 158 /*
 159  * lock allocators, and reserving appropriate number of bits for
 160  * meta blocks and data clusters.
 161  *
 162  * in some cases, we don't need to reserve clusters, just let data_ac
 163  * be NULL.
 164  */
 165 static int ocfs2_lock_allocators_move_extents(struct inode *inode,
 166                                         struct ocfs2_extent_tree *et,
 167                                         u32 clusters_to_move,
 168                                         u32 extents_to_split,
 169                                         struct ocfs2_alloc_context **meta_ac,
 170                                         struct ocfs2_alloc_context **data_ac,
 171                                         int extra_blocks,
 172                                         int *credits)
 173 {
 174         int ret, num_free_extents;
 175         unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move;
 176         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 177
 178         num_free_extents = ocfs2_num_free_extents(osb, et);
 179         if (num_free_extents < 0) {
 180                 ret = num_free_extents;
 181                 mlog_errno(ret);
 182                 goto out;
 183         }
 184
 185         if (!num_free_extents ||
 186             (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed))
 187                 extra_blocks += ocfs2_extend_meta_needed(et->et_root_el);
 188
 189         ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac);
 190         if (ret) {
 191                 mlog_errno(ret);
 192                 goto out;
 193         }
 194
 195         if (data_ac) {
 196                 ret = ocfs2_reserve_clusters(osb, clusters_to_move, data_ac);
 197                 if (ret) {
 198                         mlog_errno(ret);
 199                         goto out;
 200                 }
 201         }
 202
 203         *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el,
 204                                               clusters_to_move + 2);
 205
 206         mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n",
 207              extra_blocks, clusters_to_move, *credits);
 208 out:
 209         if (ret) {
 210                 if (*meta_ac) {
 211                         ocfs2_free_alloc_context(*meta_ac);
 212                         *meta_ac = NULL;
 213                 }
 214         }
 215
 216         return ret;
 217 }
 218
 219 /*
 220  * Using one journal handle to guarantee the data consistency in case
 221  * crash happens anywhere.
 222  */
 223 static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
 224                                u32 cpos, u32 phys_cpos, u32 len, int ext_flags)
 225 {
 226         int ret, credits = 0, extra_blocks = 0;
 227         handle_t *handle;
 228         struct inode *inode = context->inode;
 229         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 230         struct inode *tl_inode = osb->osb_tl_inode;
 231         struct ocfs2_refcount_tree *ref_tree = NULL;
 232         u32 new_phys_cpos, new_len;
 233         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 234
 235         if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) {
 236
 237                 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features &
 238                          OCFS2_HAS_REFCOUNT_FL));
 239
 240                 BUG_ON(!context->refcount_loc);
 241
 242                 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
 243                                                &ref_tree, NULL);
 244                 if (ret) {
 245                         mlog_errno(ret);
 246                         return ret;
 247                 }
 248
 249                 ret = ocfs2_prepare_refcount_change_for_del(inode,
 250                                                         context->refcount_loc,
 251                                                         phys_blkno,
 252                                                         len,
 253                                                         &credits,
 254                                                         &extra_blocks);
 255                 if (ret) {
 256                         mlog_errno(ret);
 257                         goto out;
 258                 }
 259         }
 260
 261         ret = ocfs2_lock_allocators_move_extents(inode, &context->et, len, 1,
 262                                                  &context->meta_ac,
 263                                                  &context->data_ac,
 264                                                  extra_blocks, &credits);
 265         if (ret) {
 266                 mlog_errno(ret);
 267                 goto out;
 268         }
 269
 270         /*
 271          * should be using allocation reservation strategy there?
 272          *
 273          * if (context->data_ac)
 274          *      context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
 275          */
 276
 277         mutex_lock(&tl_inode->i_mutex);
 278
 279         if (ocfs2_truncate_log_needs_flush(osb)) {
 280                 ret = __ocfs2_flush_truncate_log(osb);
 281                 if (ret < 0) {
 282                         mlog_errno(ret);
 283                         goto out_unlock_mutex;
 284                 }
 285         }
 286
 287         handle = ocfs2_start_trans(osb, credits);
 288         if (IS_ERR(handle)) {
 289                 ret = PTR_ERR(handle);
 290                 mlog_errno(ret);
 291                 goto out_unlock_mutex;
 292         }
 293
 294         ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, len,
 295                                      &new_phys_cpos, &new_len);
 296         if (ret) {
 297                 mlog_errno(ret);
 298                 goto out_commit;
 299         }
 300
 301         /*
 302          * we're not quite patient here to make multiple attempts for claiming
 303          * enough clusters, failure to claim clusters per-requested is not a
 304          * disaster though, it can only mean partial range of defragmentation
 305          * or extent movements gets gone, users anyway is able to have another
 306          * try as they wish anytime, since they're going to be returned a
 307          * '-ENOSPC' and completed length of this movement.
 308          */
 309         if (new_len != len) {
 310                 mlog(0, "len_claimed: %u, len: %u\n", new_len, len);
 311                 context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
 312                 ret = -ENOSPC;
 313                 goto out_commit;
 314         }
 315
 316         mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
 317              phys_cpos, new_phys_cpos);
 318
 319         ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos,
 320                                   new_phys_cpos, ext_flags);
 321         if (ret)
 322                 mlog_errno(ret);
 323
 324         /*
 325          * Here we should write the new page out first if we are
 326          * in write-back mode.
 327          */
 328         ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len);
 329         if (ret)
 330                 mlog_errno(ret);
 331
 332 out_commit:
 333         ocfs2_commit_trans(osb, handle);
 334
 335 out_unlock_mutex:
 336         mutex_unlock(&tl_inode->i_mutex);
 337
 338         if (context->data_ac) {
 339                 ocfs2_free_alloc_context(context->data_ac);
 340                 context->data_ac = NULL;
 341         }
 342
 343         if (context->meta_ac) {
 344                 ocfs2_free_alloc_context(context->meta_ac);
 345                 context->meta_ac = NULL;
 346         }
 347
 348 out:
 349         if (ref_tree)
 350                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
 351
 352         return ret;
 353 }
 354
 355 /*
 356  * find the victim alloc group, where #blkno fits.
 357  */
 358 static int ocfs2_find_victim_alloc_group(struct inode *inode,
 359                                          u64 vict_blkno,
 360                                          int type, int slot,
 361                                          int *vict_bit,
 362                                          struct buffer_head **ret_bh)
 363 {
 364         int ret, i, blocks_per_unit = 1;
 365         u64 blkno;
 366         char namebuf[40];
 367
 368         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 369         struct buffer_head *ac_bh = NULL, *gd_bh = NULL;
 370         struct ocfs2_chain_list *cl;
 371         struct ocfs2_chain_rec *rec;
 372         struct ocfs2_dinode *ac_dinode;
 373         struct ocfs2_group_desc *bg;
 374
 375         ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot);
 376         ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
 377                                          strlen(namebuf), &blkno);
 378         if (ret) {
 379                 ret = -ENOENT;
 380                 goto out;
 381         }
 382
 383         ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh);
 384         if (ret) {
 385                 mlog_errno(ret);
 386                 goto out;
 387         }
 388
 389         ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data;
 390         cl = &(ac_dinode->id2.i_chain);
 391         rec = &(cl->cl_recs[0]);
 392
 393         if (type == GLOBAL_BITMAP_SYSTEM_INODE)
 394                 blocks_per_unit <<= (osb->s_clustersize_bits -
 395                                                 inode->i_sb->s_blocksize_bits);
 396         /*
 397          * 'vict_blkno' was out of the valid range.
 398          */
 399         if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
 400             (vict_blkno >= (le32_to_cpu(ac_dinode->id1.bitmap1.i_total) *
 401                                 blocks_per_unit))) {
 402                 ret = -EINVAL;
 403                 goto out;
 404         }
 405
 406         for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
 407
 408                 rec = &(cl->cl_recs[i]);
 409                 if (!rec)
 410                         continue;
 411
 412                 bg = NULL;
 413
 414                 do {
 415                         if (!bg)
 416                                 blkno = le64_to_cpu(rec->c_blkno);
 417                         else
 418                                 blkno = le64_to_cpu(bg->bg_next_group);
 419
 420                         if (gd_bh) {
 421                                 brelse(gd_bh);
 422                                 gd_bh = NULL;
 423                         }
 424
 425                         ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh);
 426                         if (ret) {
 427                                 mlog_errno(ret);
 428                                 goto out;
 429                         }
 430
 431                         bg = (struct ocfs2_group_desc *)gd_bh->b_data;
 432
 433                         if (vict_blkno < (le64_to_cpu(bg->bg_blkno) +
 434                                                 le16_to_cpu(bg->bg_bits))) {
 435
 436                                 *ret_bh = gd_bh;
 437                                 *vict_bit = (vict_blkno - blkno) /
 438                                                         blocks_per_unit;
 439                                 mlog(0, "find the victim group: #%llu, "
 440                                      "total_bits: %u, vict_bit: %u\n",
 441                                      blkno, le16_to_cpu(bg->bg_bits),
 442                                      *vict_bit);
 443                                 goto out;
 444                         }
 445
 446                 } while (le64_to_cpu(bg->bg_next_group));
 447         }
 448
 449         ret = -EINVAL;
 450 out:
 451         brelse(ac_bh);
 452
 453         /*
 454          * caller has to release the gd_bh properly.
 455          */
 456         return ret;
 457 }
 458
 459 /*
 460  * XXX: helper to validate and adjust moving goal.
 461  */
 462 static int ocfs2_validate_and_adjust_move_goal(struct inode *inode,
 463                                                struct ocfs2_move_extents *range)
 464 {
 465         int ret, goal_bit = 0;
 466
 467         struct buffer_head *gd_bh = NULL;
 468         struct ocfs2_group_desc *bg;
 469         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 470         int c_to_b = 1 << (osb->s_clustersize_bits -
 471                                         inode->i_sb->s_blocksize_bits);
 472
 473         /*
 474          * validate goal sits within global_bitmap, and return the victim
 475          * group desc
 476          */
 477         ret = ocfs2_find_victim_alloc_group(inode, range->me_goal,
 478                                             GLOBAL_BITMAP_SYSTEM_INODE,
 479                                             OCFS2_INVALID_SLOT,
 480                                             &goal_bit, &gd_bh);
 481         if (ret)
 482                 goto out;
 483
 484         bg = (struct ocfs2_group_desc *)gd_bh->b_data;
 485
 486         /*
 487          * make goal become cluster aligned.
 488          */
 489         if (range->me_goal % c_to_b)
 490                 range->me_goal = range->me_goal / c_to_b * c_to_b;
 491
 492         /*
 493          * moving goal is not allowd to start with a group desc blok(#0 blk)
 494          * let's compromise to the latter cluster.
 495          */
 496         if (range->me_goal == le64_to_cpu(bg->bg_blkno))
 497                 range->me_goal += c_to_b;
 498
 499         /*
 500          * movement is not gonna cross two groups.
 501          */
 502         if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize <
 503                                                                 range->me_len) {
 504                 ret = -EINVAL;
 505                 goto out;
 506         }
 507         /*
 508          * more exact validations/adjustments will be performed later during
 509          * moving operation for each extent range.
 510          */
 511         mlog(0, "extents get ready to be moved to #%llu block\n",
 512              range->me_goal);
 513
 514 out:
 515         brelse(gd_bh);
 516
 517         return ret;
 518 }
 519
 520 static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
 521                                     int *goal_bit, u32 move_len, u32 max_hop,
 522                                     u32 *phys_cpos)
 523 {
 524         int i, used, last_free_bits = 0, base_bit = *goal_bit;
 525         struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
 526         u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
 527                                                  le64_to_cpu(gd->bg_blkno));
 528
 529         for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) {
 530
 531                 used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap);
 532                 if (used) {
 533                         /*
 534                          * we even tried searching the free chunk by jumping
 535                          * a 'max_hop' distance, but still failed.
 536                          */
 537                         if ((i - base_bit) > max_hop) {
 538                                 *phys_cpos = 0;
 539                                 break;
 540                         }
 541
 542                         if (last_free_bits)
 543                                 last_free_bits = 0;
 544
 545                         continue;
 546                 } else
 547                         last_free_bits++;
 548
 549                 if (last_free_bits == move_len) {
 550                         *goal_bit = i;
 551                         *phys_cpos = base_cpos + i;
 552                         break;
 553                 }
 554         }
 555
 556         mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos);
 557 }
 558
 559 static int ocfs2_alloc_dinode_update_counts(struct inode *inode,
 560                                        handle_t *handle,
 561                                        struct buffer_head *di_bh,
 562                                        u32 num_bits,
 563                                        u16 chain)
 564 {
 565         int ret;
 566         u32 tmp_used;
 567         struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
 568         struct ocfs2_chain_list *cl =
 569                                 (struct ocfs2_chain_list *) &di->id2.i_chain;
 570
 571         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
 572                                       OCFS2_JOURNAL_ACCESS_WRITE);
 573         if (ret < 0) {
 574                 mlog_errno(ret);
 575                 goto out;
 576         }
 577
 578         tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);
 579         di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);
 580         le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);
 581         ocfs2_journal_dirty(handle, di_bh);
 582
 583 out:
 584         return ret;
 585 }
 586
 587 static inline int ocfs2_block_group_set_bits(handle_t *handle,
 588                                              struct inode *alloc_inode,
 589                                              struct ocfs2_group_desc *bg,
 590                                              struct buffer_head *group_bh,
 591                                              unsigned int bit_off,
 592                                              unsigned int num_bits)
 593 {
 594         int status;
 595         void *bitmap = bg->bg_bitmap;
 596         int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
 597
 598         /* All callers get the descriptor via
 599          * ocfs2_read_group_descriptor().  Any corruption is a code bug. */
 600         BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));
 601         BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
 602
 603         mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off,
 604              num_bits);
 605
 606         if (ocfs2_is_cluster_bitmap(alloc_inode))
 607                 journal_type = OCFS2_JOURNAL_ACCESS_UNDO;
 608
 609         status = ocfs2_journal_access_gd(handle,
 610                                          INODE_CACHE(alloc_inode),
 611                                          group_bh,
 612                                          journal_type);
 613         if (status < 0) {
 614                 mlog_errno(status);
 615                 goto bail;
 616         }
 617
 618         le16_add_cpu(&bg->bg_free_bits_count, -num_bits);
 619         if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {
 620                 ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"
 621                             " count %u but claims %u are freed. num_bits %d",
 622                             (unsigned long long)le64_to_cpu(bg->bg_blkno),
 623                             le16_to_cpu(bg->bg_bits),
 624                             le16_to_cpu(bg->bg_free_bits_count), num_bits);
 625                 return -EROFS;
 626         }
 627         while (num_bits--)
 628                 ocfs2_set_bit(bit_off++, bitmap);
 629
 630         ocfs2_journal_dirty(handle, group_bh);
 631
 632 bail:
 633         return status;
 634 }