linux/fs/ocfs2/quota_local.c
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   1/*
   2 *  Implementation of operations over local quota file
   3 */
   4
   5#include <linux/fs.h>
   6#include <linux/slab.h>
   7#include <linux/quota.h>
   8#include <linux/quotaops.h>
   9#include <linux/module.h>
  10
  11#include <cluster/masklog.h>
  12
  13#include "ocfs2_fs.h"
  14#include "ocfs2.h"
  15#include "inode.h"
  16#include "alloc.h"
  17#include "file.h"
  18#include "buffer_head_io.h"
  19#include "journal.h"
  20#include "sysfile.h"
  21#include "dlmglue.h"
  22#include "quota.h"
  23#include "uptodate.h"
  24#include "super.h"
  25#include "ocfs2_trace.h"
  26
  27/* Number of local quota structures per block */
  28static inline unsigned int ol_quota_entries_per_block(struct super_block *sb)
  29{
  30        return ((sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) /
  31                sizeof(struct ocfs2_local_disk_dqblk));
  32}
  33
  34/* Number of blocks with entries in one chunk */
  35static inline unsigned int ol_chunk_blocks(struct super_block *sb)
  36{
  37        return ((sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
  38                 OCFS2_QBLK_RESERVED_SPACE) << 3) /
  39               ol_quota_entries_per_block(sb);
  40}
  41
  42/* Number of entries in a chunk bitmap */
  43static unsigned int ol_chunk_entries(struct super_block *sb)
  44{
  45        return ol_chunk_blocks(sb) * ol_quota_entries_per_block(sb);
  46}
  47
  48/* Offset of the chunk in quota file */
  49static unsigned int ol_quota_chunk_block(struct super_block *sb, int c)
  50{
  51        /* 1 block for local quota file info, 1 block per chunk for chunk info */
  52        return 1 + (ol_chunk_blocks(sb) + 1) * c;
  53}
  54
  55static unsigned int ol_dqblk_block(struct super_block *sb, int c, int off)
  56{
  57        int epb = ol_quota_entries_per_block(sb);
  58
  59        return ol_quota_chunk_block(sb, c) + 1 + off / epb;
  60}
  61
  62static unsigned int ol_dqblk_block_off(struct super_block *sb, int c, int off)
  63{
  64        int epb = ol_quota_entries_per_block(sb);
  65
  66        return (off % epb) * sizeof(struct ocfs2_local_disk_dqblk);
  67}
  68
  69/* Offset of the dquot structure in the quota file */
  70static loff_t ol_dqblk_off(struct super_block *sb, int c, int off)
  71{
  72        return (ol_dqblk_block(sb, c, off) << sb->s_blocksize_bits) +
  73               ol_dqblk_block_off(sb, c, off);
  74}
  75
  76/* Compute block number from given offset */
  77static inline unsigned int ol_dqblk_file_block(struct super_block *sb, loff_t off)
  78{
  79        return off >> sb->s_blocksize_bits;
  80}
  81
  82static inline unsigned int ol_dqblk_block_offset(struct super_block *sb, loff_t off)
  83{
  84        return off & ((1 << sb->s_blocksize_bits) - 1);
  85}
  86
  87/* Compute offset in the chunk of a structure with the given offset */
  88static int ol_dqblk_chunk_off(struct super_block *sb, int c, loff_t off)
  89{
  90        int epb = ol_quota_entries_per_block(sb);
  91
  92        return ((off >> sb->s_blocksize_bits) -
  93                        ol_quota_chunk_block(sb, c) - 1) * epb
  94               + ((unsigned int)(off & ((1 << sb->s_blocksize_bits) - 1))) /
  95                 sizeof(struct ocfs2_local_disk_dqblk);
  96}
  97
  98/* Write bufferhead into the fs */
  99static int ocfs2_modify_bh(struct inode *inode, struct buffer_head *bh,
 100                void (*modify)(struct buffer_head *, void *), void *private)
 101{
 102        struct super_block *sb = inode->i_sb;
 103        handle_t *handle;
 104        int status;
 105
 106        handle = ocfs2_start_trans(OCFS2_SB(sb),
 107                                   OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
 108        if (IS_ERR(handle)) {
 109                status = PTR_ERR(handle);
 110                mlog_errno(status);
 111                return status;
 112        }
 113        status = ocfs2_journal_access_dq(handle, INODE_CACHE(inode), bh,
 114                                         OCFS2_JOURNAL_ACCESS_WRITE);
 115        if (status < 0) {
 116                mlog_errno(status);
 117                ocfs2_commit_trans(OCFS2_SB(sb), handle);
 118                return status;
 119        }
 120        lock_buffer(bh);
 121        modify(bh, private);
 122        unlock_buffer(bh);
 123        ocfs2_journal_dirty(handle, bh);
 124
 125        status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
 126        if (status < 0) {
 127                mlog_errno(status);
 128                return status;
 129        }
 130        return 0;
 131}
 132
 133/*
 134 * Read quota block from a given logical offset.
 135 *
 136 * This function acquires ip_alloc_sem and thus it must not be called with a
 137 * transaction started.
 138 */
 139static int ocfs2_read_quota_block(struct inode *inode, u64 v_block,
 140                                  struct buffer_head **bh)
 141{
 142        int rc = 0;
 143        struct buffer_head *tmp = *bh;
 144
 145        if (i_size_read(inode) >> inode->i_sb->s_blocksize_bits <= v_block) {
 146                ocfs2_error(inode->i_sb,
 147                            "Quota file %llu is probably corrupted! Requested "
 148                            "to read block %Lu but file has size only %Lu\n",
 149                            (unsigned long long)OCFS2_I(inode)->ip_blkno,
 150                            (unsigned long long)v_block,
 151                            (unsigned long long)i_size_read(inode));
 152                return -EIO;
 153        }
 154        rc = ocfs2_read_virt_blocks(inode, v_block, 1, &tmp, 0,
 155                                    ocfs2_validate_quota_block);
 156        if (rc)
 157                mlog_errno(rc);
 158
 159        /* If ocfs2_read_virt_blocks() got us a new bh, pass it up. */
 160        if (!rc && !*bh)
 161                *bh = tmp;
 162
 163        return rc;
 164}
 165
 166/* Check whether we understand format of quota files */
 167static int ocfs2_local_check_quota_file(struct super_block *sb, int type)
 168{
 169        unsigned int lmagics[MAXQUOTAS] = OCFS2_LOCAL_QMAGICS;
 170        unsigned int lversions[MAXQUOTAS] = OCFS2_LOCAL_QVERSIONS;
 171        unsigned int gmagics[MAXQUOTAS] = OCFS2_GLOBAL_QMAGICS;
 172        unsigned int gversions[MAXQUOTAS] = OCFS2_GLOBAL_QVERSIONS;
 173        unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 174                                        GROUP_QUOTA_SYSTEM_INODE };
 175        struct buffer_head *bh = NULL;
 176        struct inode *linode = sb_dqopt(sb)->files[type];
 177        struct inode *ginode = NULL;
 178        struct ocfs2_disk_dqheader *dqhead;
 179        int status, ret = 0;
 180
 181        /* First check whether we understand local quota file */
 182        status = ocfs2_read_quota_block(linode, 0, &bh);
 183        if (status) {
 184                mlog_errno(status);
 185                mlog(ML_ERROR, "failed to read quota file header (type=%d)\n",
 186                        type);
 187                goto out_err;
 188        }
 189        dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 190        if (le32_to_cpu(dqhead->dqh_magic) != lmagics[type]) {
 191                mlog(ML_ERROR, "quota file magic does not match (%u != %u),"
 192                        " type=%d\n", le32_to_cpu(dqhead->dqh_magic),
 193                        lmagics[type], type);
 194                goto out_err;
 195        }
 196        if (le32_to_cpu(dqhead->dqh_version) != lversions[type]) {
 197                mlog(ML_ERROR, "quota file version does not match (%u != %u),"
 198                        " type=%d\n", le32_to_cpu(dqhead->dqh_version),
 199                        lversions[type], type);
 200                goto out_err;
 201        }
 202        brelse(bh);
 203        bh = NULL;
 204
 205        /* Next check whether we understand global quota file */
 206        ginode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 207                                                OCFS2_INVALID_SLOT);
 208        if (!ginode) {
 209                mlog(ML_ERROR, "cannot get global quota file inode "
 210                                "(type=%d)\n", type);
 211                goto out_err;
 212        }
 213        /* Since the header is read only, we don't care about locking */
 214        status = ocfs2_read_quota_block(ginode, 0, &bh);
 215        if (status) {
 216                mlog_errno(status);
 217                mlog(ML_ERROR, "failed to read global quota file header "
 218                                "(type=%d)\n", type);
 219                goto out_err;
 220        }
 221        dqhead = (struct ocfs2_disk_dqheader *)(bh->b_data);
 222        if (le32_to_cpu(dqhead->dqh_magic) != gmagics[type]) {
 223                mlog(ML_ERROR, "global quota file magic does not match "
 224                        "(%u != %u), type=%d\n",
 225                        le32_to_cpu(dqhead->dqh_magic), gmagics[type], type);
 226                goto out_err;
 227        }
 228        if (le32_to_cpu(dqhead->dqh_version) != gversions[type]) {
 229                mlog(ML_ERROR, "global quota file version does not match "
 230                        "(%u != %u), type=%d\n",
 231                        le32_to_cpu(dqhead->dqh_version), gversions[type],
 232                        type);
 233                goto out_err;
 234        }
 235
 236        ret = 1;
 237out_err:
 238        brelse(bh);
 239        iput(ginode);
 240        return ret;
 241}
 242
 243/* Release given list of quota file chunks */
 244static void ocfs2_release_local_quota_bitmaps(struct list_head *head)
 245{
 246        struct ocfs2_quota_chunk *pos, *next;
 247
 248        list_for_each_entry_safe(pos, next, head, qc_chunk) {
 249                list_del(&pos->qc_chunk);
 250                brelse(pos->qc_headerbh);
 251                kmem_cache_free(ocfs2_qf_chunk_cachep, pos);
 252        }
 253}
 254
 255/* Load quota bitmaps into memory */
 256static int ocfs2_load_local_quota_bitmaps(struct inode *inode,
 257                        struct ocfs2_local_disk_dqinfo *ldinfo,
 258                        struct list_head *head)
 259{
 260        struct ocfs2_quota_chunk *newchunk;
 261        int i, status;
 262
 263        INIT_LIST_HEAD(head);
 264        for (i = 0; i < le32_to_cpu(ldinfo->dqi_chunks); i++) {
 265                newchunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 266                if (!newchunk) {
 267                        ocfs2_release_local_quota_bitmaps(head);
 268                        return -ENOMEM;
 269                }
 270                newchunk->qc_num = i;
 271                newchunk->qc_headerbh = NULL;
 272                status = ocfs2_read_quota_block(inode,
 273                                ol_quota_chunk_block(inode->i_sb, i),
 274                                &newchunk->qc_headerbh);
 275                if (status) {
 276                        mlog_errno(status);
 277                        kmem_cache_free(ocfs2_qf_chunk_cachep, newchunk);
 278                        ocfs2_release_local_quota_bitmaps(head);
 279                        return status;
 280                }
 281                list_add_tail(&newchunk->qc_chunk, head);
 282        }
 283        return 0;
 284}
 285
 286static void olq_update_info(struct buffer_head *bh, void *private)
 287{
 288        struct mem_dqinfo *info = private;
 289        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 290        struct ocfs2_local_disk_dqinfo *ldinfo;
 291
 292        ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 293                                                OCFS2_LOCAL_INFO_OFF);
 294        spin_lock(&dq_data_lock);
 295        ldinfo->dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK);
 296        ldinfo->dqi_chunks = cpu_to_le32(oinfo->dqi_chunks);
 297        ldinfo->dqi_blocks = cpu_to_le32(oinfo->dqi_blocks);
 298        spin_unlock(&dq_data_lock);
 299}
 300
 301static int ocfs2_add_recovery_chunk(struct super_block *sb,
 302                                    struct ocfs2_local_disk_chunk *dchunk,
 303                                    int chunk,
 304                                    struct list_head *head)
 305{
 306        struct ocfs2_recovery_chunk *rc;
 307
 308        rc = kmalloc(sizeof(struct ocfs2_recovery_chunk), GFP_NOFS);
 309        if (!rc)
 310                return -ENOMEM;
 311        rc->rc_chunk = chunk;
 312        rc->rc_bitmap = kmalloc(sb->s_blocksize, GFP_NOFS);
 313        if (!rc->rc_bitmap) {
 314                kfree(rc);
 315                return -ENOMEM;
 316        }
 317        memcpy(rc->rc_bitmap, dchunk->dqc_bitmap,
 318               (ol_chunk_entries(sb) + 7) >> 3);
 319        list_add_tail(&rc->rc_list, head);
 320        return 0;
 321}
 322
 323static void free_recovery_list(struct list_head *head)
 324{
 325        struct ocfs2_recovery_chunk *next;
 326        struct ocfs2_recovery_chunk *rchunk;
 327
 328        list_for_each_entry_safe(rchunk, next, head, rc_list) {
 329                list_del(&rchunk->rc_list);
 330                kfree(rchunk->rc_bitmap);
 331                kfree(rchunk);
 332        }
 333}
 334
 335void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec)
 336{
 337        int type;
 338
 339        for (type = 0; type < MAXQUOTAS; type++)
 340                free_recovery_list(&(rec->r_list[type]));
 341        kfree(rec);
 342}
 343
 344/* Load entries in our quota file we have to recover*/
 345static int ocfs2_recovery_load_quota(struct inode *lqinode,
 346                                     struct ocfs2_local_disk_dqinfo *ldinfo,
 347                                     int type,
 348                                     struct list_head *head)
 349{
 350        struct super_block *sb = lqinode->i_sb;
 351        struct buffer_head *hbh;
 352        struct ocfs2_local_disk_chunk *dchunk;
 353        int i, chunks = le32_to_cpu(ldinfo->dqi_chunks);
 354        int status = 0;
 355
 356        for (i = 0; i < chunks; i++) {
 357                hbh = NULL;
 358                status = ocfs2_read_quota_block(lqinode,
 359                                                ol_quota_chunk_block(sb, i),
 360                                                &hbh);
 361                if (status) {
 362                        mlog_errno(status);
 363                        break;
 364                }
 365                dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 366                if (le32_to_cpu(dchunk->dqc_free) < ol_chunk_entries(sb))
 367                        status = ocfs2_add_recovery_chunk(sb, dchunk, i, head);
 368                brelse(hbh);
 369                if (status < 0)
 370                        break;
 371        }
 372        if (status < 0)
 373                free_recovery_list(head);
 374        return status;
 375}
 376
 377static struct ocfs2_quota_recovery *ocfs2_alloc_quota_recovery(void)
 378{
 379        int type;
 380        struct ocfs2_quota_recovery *rec;
 381
 382        rec = kmalloc(sizeof(struct ocfs2_quota_recovery), GFP_NOFS);
 383        if (!rec)
 384                return NULL;
 385        for (type = 0; type < MAXQUOTAS; type++)
 386                INIT_LIST_HEAD(&(rec->r_list[type]));
 387        return rec;
 388}
 389
 390/* Load information we need for quota recovery into memory */
 391struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
 392                                                struct ocfs2_super *osb,
 393                                                int slot_num)
 394{
 395        unsigned int feature[MAXQUOTAS] = { OCFS2_FEATURE_RO_COMPAT_USRQUOTA,
 396                                            OCFS2_FEATURE_RO_COMPAT_GRPQUOTA};
 397        unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 398                                        LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 399        struct super_block *sb = osb->sb;
 400        struct ocfs2_local_disk_dqinfo *ldinfo;
 401        struct inode *lqinode;
 402        struct buffer_head *bh;
 403        int type;
 404        int status = 0;
 405        struct ocfs2_quota_recovery *rec;
 406
 407        printk(KERN_NOTICE "ocfs2: Beginning quota recovery on device (%s) for "
 408               "slot %u\n", osb->dev_str, slot_num);
 409
 410        rec = ocfs2_alloc_quota_recovery();
 411        if (!rec)
 412                return ERR_PTR(-ENOMEM);
 413        /* First init... */
 414
 415        for (type = 0; type < MAXQUOTAS; type++) {
 416                if (!OCFS2_HAS_RO_COMPAT_FEATURE(sb, feature[type]))
 417                        continue;
 418                /* At this point, journal of the slot is already replayed so
 419                 * we can trust metadata and data of the quota file */
 420                lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 421                if (!lqinode) {
 422                        status = -ENOENT;
 423                        goto out;
 424                }
 425                status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 426                                               OCFS2_META_LOCK_RECOVERY);
 427                if (status < 0) {
 428                        mlog_errno(status);
 429                        goto out_put;
 430                }
 431                /* Now read local header */
 432                bh = NULL;
 433                status = ocfs2_read_quota_block(lqinode, 0, &bh);
 434                if (status) {
 435                        mlog_errno(status);
 436                        mlog(ML_ERROR, "failed to read quota file info header "
 437                                "(slot=%d type=%d)\n", slot_num, type);
 438                        goto out_lock;
 439                }
 440                ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 441                                                        OCFS2_LOCAL_INFO_OFF);
 442                status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 443                                                   &rec->r_list[type]);
 444                brelse(bh);
 445out_lock:
 446                ocfs2_inode_unlock(lqinode, 1);
 447out_put:
 448                iput(lqinode);
 449                if (status < 0)
 450                        break;
 451        }
 452out:
 453        if (status < 0) {
 454                ocfs2_free_quota_recovery(rec);
 455                rec = ERR_PTR(status);
 456        }
 457        return rec;
 458}
 459
 460/* Sync changes in local quota file into global quota file and
 461 * reinitialize local quota file.
 462 * The function expects local quota file to be already locked and
 463 * dqonoff_mutex locked. */
 464static int ocfs2_recover_local_quota_file(struct inode *lqinode,
 465                                          int type,
 466                                          struct ocfs2_quota_recovery *rec)
 467{
 468        struct super_block *sb = lqinode->i_sb;
 469        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 470        struct ocfs2_local_disk_chunk *dchunk;
 471        struct ocfs2_local_disk_dqblk *dqblk;
 472        struct dquot *dquot;
 473        handle_t *handle;
 474        struct buffer_head *hbh = NULL, *qbh = NULL;
 475        int status = 0;
 476        int bit, chunk;
 477        struct ocfs2_recovery_chunk *rchunk, *next;
 478        qsize_t spacechange, inodechange;
 479
 480        trace_ocfs2_recover_local_quota_file((unsigned long)lqinode->i_ino, type);
 481
 482        list_for_each_entry_safe(rchunk, next, &(rec->r_list[type]), rc_list) {
 483                chunk = rchunk->rc_chunk;
 484                hbh = NULL;
 485                status = ocfs2_read_quota_block(lqinode,
 486                                                ol_quota_chunk_block(sb, chunk),
 487                                                &hbh);
 488                if (status) {
 489                        mlog_errno(status);
 490                        break;
 491                }
 492                dchunk = (struct ocfs2_local_disk_chunk *)hbh->b_data;
 493                for_each_set_bit(bit, rchunk->rc_bitmap, ol_chunk_entries(sb)) {
 494                        qbh = NULL;
 495                        status = ocfs2_read_quota_block(lqinode,
 496                                                ol_dqblk_block(sb, chunk, bit),
 497                                                &qbh);
 498                        if (status) {
 499                                mlog_errno(status);
 500                                break;
 501                        }
 502                        dqblk = (struct ocfs2_local_disk_dqblk *)(qbh->b_data +
 503                                ol_dqblk_block_off(sb, chunk, bit));
 504                        dquot = dqget(sb,
 505                                      make_kqid(&init_user_ns, type,
 506                                                le64_to_cpu(dqblk->dqb_id)));
 507                        if (!dquot) {
 508                                status = -EIO;
 509                                mlog(ML_ERROR, "Failed to get quota structure "
 510                                     "for id %u, type %d. Cannot finish quota "
 511                                     "file recovery.\n",
 512                                     (unsigned)le64_to_cpu(dqblk->dqb_id),
 513                                     type);
 514                                goto out_put_bh;
 515                        }
 516                        status = ocfs2_lock_global_qf(oinfo, 1);
 517                        if (status < 0) {
 518                                mlog_errno(status);
 519                                goto out_put_dquot;
 520                        }
 521
 522                        handle = ocfs2_start_trans(OCFS2_SB(sb),
 523                                                   OCFS2_QSYNC_CREDITS);
 524                        if (IS_ERR(handle)) {
 525                                status = PTR_ERR(handle);
 526                                mlog_errno(status);
 527                                goto out_drop_lock;
 528                        }
 529                        mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 530                        spin_lock(&dq_data_lock);
 531                        /* Add usage from quota entry into quota changes
 532                         * of our node. Auxiliary variables are important
 533                         * due to signedness */
 534                        spacechange = le64_to_cpu(dqblk->dqb_spacemod);
 535                        inodechange = le64_to_cpu(dqblk->dqb_inodemod);
 536                        dquot->dq_dqb.dqb_curspace += spacechange;
 537                        dquot->dq_dqb.dqb_curinodes += inodechange;
 538                        spin_unlock(&dq_data_lock);
 539                        /* We want to drop reference held by the crashed
 540                         * node. Since we have our own reference we know
 541                         * global structure actually won't be freed. */
 542                        status = ocfs2_global_release_dquot(dquot);
 543                        if (status < 0) {
 544                                mlog_errno(status);
 545                                goto out_commit;
 546                        }
 547                        /* Release local quota file entry */
 548                        status = ocfs2_journal_access_dq(handle,
 549                                        INODE_CACHE(lqinode),
 550                                        qbh, OCFS2_JOURNAL_ACCESS_WRITE);
 551                        if (status < 0) {
 552                                mlog_errno(status);
 553                                goto out_commit;
 554                        }
 555                        lock_buffer(qbh);
 556                        WARN_ON(!ocfs2_test_bit_unaligned(bit, dchunk->dqc_bitmap));
 557                        ocfs2_clear_bit_unaligned(bit, dchunk->dqc_bitmap);
 558                        le32_add_cpu(&dchunk->dqc_free, 1);
 559                        unlock_buffer(qbh);
 560                        ocfs2_journal_dirty(handle, qbh);
 561out_commit:
 562                        mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 563                        ocfs2_commit_trans(OCFS2_SB(sb), handle);
 564out_drop_lock:
 565                        ocfs2_unlock_global_qf(oinfo, 1);
 566out_put_dquot:
 567                        dqput(dquot);
 568out_put_bh:
 569                        brelse(qbh);
 570                        if (status < 0)
 571                                break;
 572                }
 573                brelse(hbh);
 574                list_del(&rchunk->rc_list);
 575                kfree(rchunk->rc_bitmap);
 576                kfree(rchunk);
 577                if (status < 0)
 578                        break;
 579        }
 580        if (status < 0)
 581                free_recovery_list(&(rec->r_list[type]));
 582        if (status)
 583                mlog_errno(status);
 584        return status;
 585}
 586
 587/* Recover local quota files for given node different from us */
 588int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
 589                                struct ocfs2_quota_recovery *rec,
 590                                int slot_num)
 591{
 592        unsigned int ino[MAXQUOTAS] = { LOCAL_USER_QUOTA_SYSTEM_INODE,
 593                                        LOCAL_GROUP_QUOTA_SYSTEM_INODE };
 594        struct super_block *sb = osb->sb;
 595        struct ocfs2_local_disk_dqinfo *ldinfo;
 596        struct buffer_head *bh;
 597        handle_t *handle;
 598        int type;
 599        int status = 0;
 600        struct inode *lqinode;
 601        unsigned int flags;
 602
 603        printk(KERN_NOTICE "ocfs2: Finishing quota recovery on device (%s) for "
 604               "slot %u\n", osb->dev_str, slot_num);
 605
 606        mutex_lock(&sb_dqopt(sb)->dqonoff_mutex);
 607        for (type = 0; type < MAXQUOTAS; type++) {
 608                if (list_empty(&(rec->r_list[type])))
 609                        continue;
 610                trace_ocfs2_finish_quota_recovery(slot_num);
 611                lqinode = ocfs2_get_system_file_inode(osb, ino[type], slot_num);
 612                if (!lqinode) {
 613                        status = -ENOENT;
 614                        goto out;
 615                }
 616                status = ocfs2_inode_lock_full(lqinode, NULL, 1,
 617                                                       OCFS2_META_LOCK_NOQUEUE);
 618                /* Someone else is holding the lock? Then he must be
 619                 * doing the recovery. Just skip the file... */
 620                if (status == -EAGAIN) {
 621                        printk(KERN_NOTICE "ocfs2: Skipping quota recovery on "
 622                               "device (%s) for slot %d because quota file is "
 623                               "locked.\n", osb->dev_str, slot_num);
 624                        status = 0;
 625                        goto out_put;
 626                } else if (status < 0) {
 627                        mlog_errno(status);
 628                        goto out_put;
 629                }
 630                /* Now read local header */
 631                bh = NULL;
 632                status = ocfs2_read_quota_block(lqinode, 0, &bh);
 633                if (status) {
 634                        mlog_errno(status);
 635                        mlog(ML_ERROR, "failed to read quota file info header "
 636                                "(slot=%d type=%d)\n", slot_num, type);
 637                        goto out_lock;
 638                }
 639                ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 640                                                        OCFS2_LOCAL_INFO_OFF);
 641                /* Is recovery still needed? */
 642                flags = le32_to_cpu(ldinfo->dqi_flags);
 643                if (!(flags & OLQF_CLEAN))
 644                        status = ocfs2_recover_local_quota_file(lqinode,
 645                                                                type,
 646                                                                rec);
 647                /* We don't want to mark file as clean when it is actually
 648                 * active */
 649                if (slot_num == osb->slot_num)
 650                        goto out_bh;
 651                /* Mark quota file as clean if we are recovering quota file of
 652                 * some other node. */
 653                handle = ocfs2_start_trans(osb,
 654                                           OCFS2_LOCAL_QINFO_WRITE_CREDITS);
 655                if (IS_ERR(handle)) {
 656                        status = PTR_ERR(handle);
 657                        mlog_errno(status);
 658                        goto out_bh;
 659                }
 660                status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
 661                                                 bh,
 662                                                 OCFS2_JOURNAL_ACCESS_WRITE);
 663                if (status < 0) {
 664                        mlog_errno(status);
 665                        goto out_trans;
 666                }
 667                lock_buffer(bh);
 668                ldinfo->dqi_flags = cpu_to_le32(flags | OLQF_CLEAN);
 669                unlock_buffer(bh);
 670                ocfs2_journal_dirty(handle, bh);
 671out_trans:
 672                ocfs2_commit_trans(osb, handle);
 673out_bh:
 674                brelse(bh);
 675out_lock:
 676                ocfs2_inode_unlock(lqinode, 1);
 677out_put:
 678                iput(lqinode);
 679                if (status < 0)
 680                        break;
 681        }
 682out:
 683        mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex);
 684        kfree(rec);
 685        return status;
 686}
 687
 688/* Read information header from quota file */
 689static int ocfs2_local_read_info(struct super_block *sb, int type)
 690{
 691        struct ocfs2_local_disk_dqinfo *ldinfo;
 692        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 693        struct ocfs2_mem_dqinfo *oinfo;
 694        struct inode *lqinode = sb_dqopt(sb)->files[type];
 695        int status;
 696        struct buffer_head *bh = NULL;
 697        struct ocfs2_quota_recovery *rec;
 698        int locked = 0;
 699
 700        /* We don't need the lock and we have to acquire quota file locks
 701         * which will later depend on this lock */
 702        mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 703        info->dqi_maxblimit = 0x7fffffffffffffffLL;
 704        info->dqi_maxilimit = 0x7fffffffffffffffLL;
 705        oinfo = kmalloc(sizeof(struct ocfs2_mem_dqinfo), GFP_NOFS);
 706        if (!oinfo) {
 707                mlog(ML_ERROR, "failed to allocate memory for ocfs2 quota"
 708                               " info.");
 709                goto out_err;
 710        }
 711        info->dqi_priv = oinfo;
 712        oinfo->dqi_type = type;
 713        INIT_LIST_HEAD(&oinfo->dqi_chunk);
 714        oinfo->dqi_rec = NULL;
 715        oinfo->dqi_lqi_bh = NULL;
 716        oinfo->dqi_libh = NULL;
 717
 718        status = ocfs2_global_read_info(sb, type);
 719        if (status < 0)
 720                goto out_err;
 721
 722        status = ocfs2_inode_lock(lqinode, &oinfo->dqi_lqi_bh, 1);
 723        if (status < 0) {
 724                mlog_errno(status);
 725                goto out_err;
 726        }
 727        locked = 1;
 728
 729        /* Now read local header */
 730        status = ocfs2_read_quota_block(lqinode, 0, &bh);
 731        if (status) {
 732                mlog_errno(status);
 733                mlog(ML_ERROR, "failed to read quota file info header "
 734                        "(type=%d)\n", type);
 735                goto out_err;
 736        }
 737        ldinfo = (struct ocfs2_local_disk_dqinfo *)(bh->b_data +
 738                                                OCFS2_LOCAL_INFO_OFF);
 739        info->dqi_flags = le32_to_cpu(ldinfo->dqi_flags);
 740        oinfo->dqi_chunks = le32_to_cpu(ldinfo->dqi_chunks);
 741        oinfo->dqi_blocks = le32_to_cpu(ldinfo->dqi_blocks);
 742        oinfo->dqi_libh = bh;
 743
 744        /* We crashed when using local quota file? */
 745        if (!(info->dqi_flags & OLQF_CLEAN)) {
 746                rec = OCFS2_SB(sb)->quota_rec;
 747                if (!rec) {
 748                        rec = ocfs2_alloc_quota_recovery();
 749                        if (!rec) {
 750                                status = -ENOMEM;
 751                                mlog_errno(status);
 752                                goto out_err;
 753                        }
 754                        OCFS2_SB(sb)->quota_rec = rec;
 755                }
 756
 757                status = ocfs2_recovery_load_quota(lqinode, ldinfo, type,
 758                                                   &rec->r_list[type]);
 759                if (status < 0) {
 760                        mlog_errno(status);
 761                        goto out_err;
 762                }
 763        }
 764
 765        status = ocfs2_load_local_quota_bitmaps(lqinode,
 766                                                ldinfo,
 767                                                &oinfo->dqi_chunk);
 768        if (status < 0) {
 769                mlog_errno(status);
 770                goto out_err;
 771        }
 772
 773        /* Now mark quota file as used */
 774        info->dqi_flags &= ~OLQF_CLEAN;
 775        status = ocfs2_modify_bh(lqinode, bh, olq_update_info, info);
 776        if (status < 0) {
 777                mlog_errno(status);
 778                goto out_err;
 779        }
 780
 781        mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 782        return 0;
 783out_err:
 784        if (oinfo) {
 785                iput(oinfo->dqi_gqinode);
 786                ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 787                ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 788                brelse(oinfo->dqi_lqi_bh);
 789                if (locked)
 790                        ocfs2_inode_unlock(lqinode, 1);
 791                ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 792                kfree(oinfo);
 793        }
 794        brelse(bh);
 795        mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 796        return -1;
 797}
 798
 799/* Write local info to quota file */
 800static int ocfs2_local_write_info(struct super_block *sb, int type)
 801{
 802        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 803        struct buffer_head *bh = ((struct ocfs2_mem_dqinfo *)info->dqi_priv)
 804                                                ->dqi_libh;
 805        int status;
 806
 807        status = ocfs2_modify_bh(sb_dqopt(sb)->files[type], bh, olq_update_info,
 808                                 info);
 809        if (status < 0) {
 810                mlog_errno(status);
 811                return -1;
 812        }
 813
 814        return 0;
 815}
 816
 817/* Release info from memory */
 818static int ocfs2_local_free_info(struct super_block *sb, int type)
 819{
 820        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 821        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 822        struct ocfs2_quota_chunk *chunk;
 823        struct ocfs2_local_disk_chunk *dchunk;
 824        int mark_clean = 1, len;
 825        int status;
 826
 827        iput(oinfo->dqi_gqinode);
 828        ocfs2_simple_drop_lockres(OCFS2_SB(sb), &oinfo->dqi_gqlock);
 829        ocfs2_lock_res_free(&oinfo->dqi_gqlock);
 830        list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 831                dchunk = (struct ocfs2_local_disk_chunk *)
 832                                        (chunk->qc_headerbh->b_data);
 833                if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 834                        len = ol_chunk_entries(sb);
 835                } else {
 836                        len = (oinfo->dqi_blocks -
 837                               ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 838                              * ol_quota_entries_per_block(sb);
 839                }
 840                /* Not all entries free? Bug! */
 841                if (le32_to_cpu(dchunk->dqc_free) != len) {
 842                        mlog(ML_ERROR, "releasing quota file with used "
 843                                        "entries (type=%d)\n", type);
 844                        mark_clean = 0;
 845                }
 846        }
 847        ocfs2_release_local_quota_bitmaps(&oinfo->dqi_chunk);
 848
 849        /* dqonoff_mutex protects us against racing with recovery thread... */
 850        if (oinfo->dqi_rec) {
 851                ocfs2_free_quota_recovery(oinfo->dqi_rec);
 852                mark_clean = 0;
 853        }
 854
 855        if (!mark_clean)
 856                goto out;
 857
 858        /* Mark local file as clean */
 859        info->dqi_flags |= OLQF_CLEAN;
 860        status = ocfs2_modify_bh(sb_dqopt(sb)->files[type],
 861                                 oinfo->dqi_libh,
 862                                 olq_update_info,
 863                                 info);
 864        if (status < 0) {
 865                mlog_errno(status);
 866                goto out;
 867        }
 868
 869out:
 870        ocfs2_inode_unlock(sb_dqopt(sb)->files[type], 1);
 871        brelse(oinfo->dqi_libh);
 872        brelse(oinfo->dqi_lqi_bh);
 873        kfree(oinfo);
 874        return 0;
 875}
 876
 877static void olq_set_dquot(struct buffer_head *bh, void *private)
 878{
 879        struct ocfs2_dquot *od = private;
 880        struct ocfs2_local_disk_dqblk *dqblk;
 881        struct super_block *sb = od->dq_dquot.dq_sb;
 882
 883        dqblk = (struct ocfs2_local_disk_dqblk *)(bh->b_data
 884                + ol_dqblk_block_offset(sb, od->dq_local_off));
 885
 886        dqblk->dqb_id = cpu_to_le64(from_kqid(&init_user_ns,
 887                                              od->dq_dquot.dq_id));
 888        spin_lock(&dq_data_lock);
 889        dqblk->dqb_spacemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curspace -
 890                                          od->dq_origspace);
 891        dqblk->dqb_inodemod = cpu_to_le64(od->dq_dquot.dq_dqb.dqb_curinodes -
 892                                          od->dq_originodes);
 893        spin_unlock(&dq_data_lock);
 894        trace_olq_set_dquot(
 895                (unsigned long long)le64_to_cpu(dqblk->dqb_spacemod),
 896                (unsigned long long)le64_to_cpu(dqblk->dqb_inodemod),
 897                from_kqid(&init_user_ns, od->dq_dquot.dq_id));
 898}
 899
 900/* Write dquot to local quota file */
 901int ocfs2_local_write_dquot(struct dquot *dquot)
 902{
 903        struct super_block *sb = dquot->dq_sb;
 904        struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
 905        struct buffer_head *bh;
 906        struct inode *lqinode = sb_dqopt(sb)->files[dquot->dq_id.type];
 907        int status;
 908
 909        status = ocfs2_read_quota_phys_block(lqinode, od->dq_local_phys_blk,
 910                                             &bh);
 911        if (status) {
 912                mlog_errno(status);
 913                goto out;
 914        }
 915        status = ocfs2_modify_bh(lqinode, bh, olq_set_dquot, od);
 916        if (status < 0) {
 917                mlog_errno(status);
 918                goto out;
 919        }
 920out:
 921        brelse(bh);
 922        return status;
 923}
 924
 925/* Find free entry in local quota file */
 926static struct ocfs2_quota_chunk *ocfs2_find_free_entry(struct super_block *sb,
 927                                                       int type,
 928                                                       int *offset)
 929{
 930        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 931        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 932        struct ocfs2_quota_chunk *chunk;
 933        struct ocfs2_local_disk_chunk *dchunk;
 934        int found = 0, len;
 935
 936        list_for_each_entry(chunk, &oinfo->dqi_chunk, qc_chunk) {
 937                dchunk = (struct ocfs2_local_disk_chunk *)
 938                                                chunk->qc_headerbh->b_data;
 939                if (le32_to_cpu(dchunk->dqc_free) > 0) {
 940                        found = 1;
 941                        break;
 942                }
 943        }
 944        if (!found)
 945                return NULL;
 946
 947        if (chunk->qc_num < oinfo->dqi_chunks - 1) {
 948                len = ol_chunk_entries(sb);
 949        } else {
 950                len = (oinfo->dqi_blocks -
 951                       ol_quota_chunk_block(sb, chunk->qc_num) - 1)
 952                      * ol_quota_entries_per_block(sb);
 953        }
 954
 955        found = ocfs2_find_next_zero_bit_unaligned(dchunk->dqc_bitmap, len, 0);
 956        /* We failed? */
 957        if (found == len) {
 958                mlog(ML_ERROR, "Did not find empty entry in chunk %d with %u"
 959                     " entries free (type=%d)\n", chunk->qc_num,
 960                     le32_to_cpu(dchunk->dqc_free), type);
 961                return ERR_PTR(-EIO);
 962        }
 963        *offset = found;
 964        return chunk;
 965}
 966
 967/* Add new chunk to the local quota file */
 968static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
 969                                                        struct super_block *sb,
 970                                                        int type,
 971                                                        int *offset)
 972{
 973        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 974        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 975        struct inode *lqinode = sb_dqopt(sb)->files[type];
 976        struct ocfs2_quota_chunk *chunk = NULL;
 977        struct ocfs2_local_disk_chunk *dchunk;
 978        int status;
 979        handle_t *handle;
 980        struct buffer_head *bh = NULL, *dbh = NULL;
 981        u64 p_blkno;
 982
 983        /* We are protected by dqio_sem so no locking needed */
 984        status = ocfs2_extend_no_holes(lqinode, NULL,
 985                                       lqinode->i_size + 2 * sb->s_blocksize,
 986                                       lqinode->i_size);
 987        if (status < 0) {
 988                mlog_errno(status);
 989                goto out;
 990        }
 991        status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
 992                                          lqinode->i_size + 2 * sb->s_blocksize);
 993        if (status < 0) {
 994                mlog_errno(status);
 995                goto out;
 996        }
 997
 998        chunk = kmem_cache_alloc(ocfs2_qf_chunk_cachep, GFP_NOFS);
 999        if (!chunk) {
1000                status = -ENOMEM;
1001                mlog_errno(status);
1002                goto out;
1003        }
1004        /* Local quota info and two new blocks we initialize */
1005        handle = ocfs2_start_trans(OCFS2_SB(sb),
1006                        OCFS2_LOCAL_QINFO_WRITE_CREDITS +
1007                        2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
1008        if (IS_ERR(handle)) {
1009                status = PTR_ERR(handle);
1010                mlog_errno(status);
1011                goto out;
1012        }
1013
1014        /* Initialize chunk header */
1015        status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1016                                             &p_blkno, NULL, NULL);
1017        if (status < 0) {
1018                mlog_errno(status);
1019                goto out_trans;
1020        }
1021        bh = sb_getblk(sb, p_blkno);
1022        if (!bh) {
1023                status = -ENOMEM;
1024                mlog_errno(status);
1025                goto out_trans;
1026        }
1027        dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1028        ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1029        status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1030                                         OCFS2_JOURNAL_ACCESS_CREATE);
1031        if (status < 0) {
1032                mlog_errno(status);
1033                goto out_trans;
1034        }
1035        lock_buffer(bh);
1036        dchunk->dqc_free = cpu_to_le32(ol_quota_entries_per_block(sb));
1037        memset(dchunk->dqc_bitmap, 0,
1038               sb->s_blocksize - sizeof(struct ocfs2_local_disk_chunk) -
1039               OCFS2_QBLK_RESERVED_SPACE);
1040        unlock_buffer(bh);
1041        ocfs2_journal_dirty(handle, bh);
1042
1043        /* Initialize new block with structures */
1044        status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks + 1,
1045                                             &p_blkno, NULL, NULL);
1046        if (status < 0) {
1047                mlog_errno(status);
1048                goto out_trans;
1049        }
1050        dbh = sb_getblk(sb, p_blkno);
1051        if (!dbh) {
1052                status = -ENOMEM;
1053                mlog_errno(status);
1054                goto out_trans;
1055        }
1056        ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), dbh);
1057        status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), dbh,
1058                                         OCFS2_JOURNAL_ACCESS_CREATE);
1059        if (status < 0) {
1060                mlog_errno(status);
1061                goto out_trans;
1062        }
1063        lock_buffer(dbh);
1064        memset(dbh->b_data, 0, sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE);
1065        unlock_buffer(dbh);
1066        ocfs2_journal_dirty(handle, dbh);
1067
1068        /* Update local quotafile info */
1069        oinfo->dqi_blocks += 2;
1070        oinfo->dqi_chunks++;
1071        status = ocfs2_local_write_info(sb, type);
1072        if (status < 0) {
1073                mlog_errno(status);
1074                goto out_trans;
1075        }
1076        status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1077        if (status < 0) {
1078                mlog_errno(status);
1079                goto out;
1080        }
1081
1082        list_add_tail(&chunk->qc_chunk, &oinfo->dqi_chunk);
1083        chunk->qc_num = list_entry(chunk->qc_chunk.prev,
1084                                   struct ocfs2_quota_chunk,
1085                                   qc_chunk)->qc_num + 1;
1086        chunk->qc_headerbh = bh;
1087        *offset = 0;
1088        return chunk;
1089out_trans:
1090        ocfs2_commit_trans(OCFS2_SB(sb), handle);
1091out:
1092        brelse(bh);
1093        brelse(dbh);
1094        kmem_cache_free(ocfs2_qf_chunk_cachep, chunk);
1095        return ERR_PTR(status);
1096}
1097
1098/* Find free entry in local quota file */
1099static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
1100                                                       struct super_block *sb,
1101                                                       int type,
1102                                                       int *offset)
1103{
1104        struct mem_dqinfo *info = sb_dqinfo(sb, type);
1105        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
1106        struct ocfs2_quota_chunk *chunk;
1107        struct inode *lqinode = sb_dqopt(sb)->files[type];
1108        struct ocfs2_local_disk_chunk *dchunk;
1109        int epb = ol_quota_entries_per_block(sb);
1110        unsigned int chunk_blocks;
1111        struct buffer_head *bh;
1112        u64 p_blkno;
1113        int status;
1114        handle_t *handle;
1115
1116        if (list_empty(&oinfo->dqi_chunk))
1117                return ocfs2_local_quota_add_chunk(sb, type, offset);
1118        /* Is the last chunk full? */
1119        chunk = list_entry(oinfo->dqi_chunk.prev,
1120                        struct ocfs2_quota_chunk, qc_chunk);
1121        chunk_blocks = oinfo->dqi_blocks -
1122                        ol_quota_chunk_block(sb, chunk->qc_num) - 1;
1123        if (ol_chunk_blocks(sb) == chunk_blocks)
1124                return ocfs2_local_quota_add_chunk(sb, type, offset);
1125
1126        /* We are protected by dqio_sem so no locking needed */
1127        status = ocfs2_extend_no_holes(lqinode, NULL,
1128                                       lqinode->i_size + sb->s_blocksize,
1129                                       lqinode->i_size);
1130        if (status < 0) {
1131                mlog_errno(status);
1132                goto out;
1133        }
1134        status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
1135                                          lqinode->i_size + sb->s_blocksize);
1136        if (status < 0) {
1137                mlog_errno(status);
1138                goto out;
1139        }
1140
1141        /* Get buffer from the just added block */
1142        status = ocfs2_extent_map_get_blocks(lqinode, oinfo->dqi_blocks,
1143                                             &p_blkno, NULL, NULL);
1144        if (status < 0) {
1145                mlog_errno(status);
1146                goto out;
1147        }
1148        bh = sb_getblk(sb, p_blkno);
1149        if (!bh) {
1150                status = -ENOMEM;
1151                mlog_errno(status);
1152                goto out;
1153        }
1154        ocfs2_set_new_buffer_uptodate(INODE_CACHE(lqinode), bh);
1155
1156        /* Local quota info, chunk header and the new block we initialize */
1157        handle = ocfs2_start_trans(OCFS2_SB(sb),
1158                        OCFS2_LOCAL_QINFO_WRITE_CREDITS +
1159                        2 * OCFS2_QUOTA_BLOCK_UPDATE_CREDITS);
1160        if (IS_ERR(handle)) {
1161                status = PTR_ERR(handle);
1162                mlog_errno(status);
1163                goto out;
1164        }
1165        /* Zero created block */
1166        status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode), bh,
1167                                 OCFS2_JOURNAL_ACCESS_CREATE);
1168        if (status < 0) {
1169                mlog_errno(status);
1170                goto out_trans;
1171        }
1172        lock_buffer(bh);
1173        memset(bh->b_data, 0, sb->s_blocksize);
1174        unlock_buffer(bh);
1175        ocfs2_journal_dirty(handle, bh);
1176
1177        /* Update chunk header */
1178        status = ocfs2_journal_access_dq(handle, INODE_CACHE(lqinode),
1179                                         chunk->qc_headerbh,
1180                                 OCFS2_JOURNAL_ACCESS_WRITE);
1181        if (status < 0) {
1182                mlog_errno(status);
1183                goto out_trans;
1184        }
1185
1186        dchunk = (struct ocfs2_local_disk_chunk *)chunk->qc_headerbh->b_data;
1187        lock_buffer(chunk->qc_headerbh);
1188        le32_add_cpu(&dchunk->dqc_free, ol_quota_entries_per_block(sb));
1189        unlock_buffer(chunk->qc_headerbh);
1190        ocfs2_journal_dirty(handle, chunk->qc_headerbh);
1191
1192        /* Update file header */
1193        oinfo->dqi_blocks++;
1194        status = ocfs2_local_write_info(sb, type);
1195        if (status < 0) {
1196                mlog_errno(status);
1197                goto out_trans;
1198        }
1199
1200        status = ocfs2_commit_trans(OCFS2_SB(sb), handle);
1201        if (status < 0) {
1202                mlog_errno(status);
1203                goto out;
1204        }
1205        *offset = chunk_blocks * epb;
1206        return chunk;
1207out_trans:
1208        ocfs2_commit_trans(OCFS2_SB(sb), handle);
1209out:
1210        return ERR_PTR(status);
1211}
1212
1213static void olq_alloc_dquot(struct buffer_head *bh, void *private)
1214{
1215        int *offset = private;
1216        struct ocfs2_local_disk_chunk *dchunk;
1217
1218        dchunk = (struct ocfs2_local_disk_chunk *)bh->b_data;
1219        ocfs2_set_bit_unaligned(*offset, dchunk->dqc_bitmap);
1220        le32_add_cpu(&dchunk->dqc_free, -1);
1221}
1222
1223/* Create dquot in the local file for given id */
1224int ocfs2_create_local_dquot(struct dquot *dquot)
1225{
1226        struct super_block *sb = dquot->dq_sb;
1227        int type = dquot->dq_id.type;
1228        struct inode *lqinode = sb_dqopt(sb)->files[type];
1229        struct ocfs2_quota_chunk *chunk;
1230        struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1231        int offset;
1232        int status;
1233        u64 pcount;
1234
1235        down_write(&OCFS2_I(lqinode)->ip_alloc_sem);
1236        chunk = ocfs2_find_free_entry(sb, type, &offset);
1237        if (!chunk) {
1238                chunk = ocfs2_extend_local_quota_file(sb, type, &offset);
1239                if (IS_ERR(chunk)) {
1240                        status = PTR_ERR(chunk);
1241                        goto out;
1242                }
1243        } else if (IS_ERR(chunk)) {
1244                status = PTR_ERR(chunk);
1245                goto out;
1246        }
1247        od->dq_local_off = ol_dqblk_off(sb, chunk->qc_num, offset);
1248        od->dq_chunk = chunk;
1249        status = ocfs2_extent_map_get_blocks(lqinode,
1250                                     ol_dqblk_block(sb, chunk->qc_num, offset),
1251                                     &od->dq_local_phys_blk,
1252                                     &pcount,
1253                                     NULL);
1254
1255        /* Initialize dquot structure on disk */
1256        status = ocfs2_local_write_dquot(dquot);
1257        if (status < 0) {
1258                mlog_errno(status);
1259                goto out;
1260        }
1261
1262        /* Mark structure as allocated */
1263        status = ocfs2_modify_bh(lqinode, chunk->qc_headerbh, olq_alloc_dquot,
1264                                 &offset);
1265        if (status < 0) {
1266                mlog_errno(status);
1267                goto out;
1268        }
1269out:
1270        up_write(&OCFS2_I(lqinode)->ip_alloc_sem);
1271        return status;
1272}
1273
1274/*
1275 * Release dquot structure from local quota file. ocfs2_release_dquot() has
1276 * already started a transaction and written all changes to global quota file
1277 */
1278int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot)
1279{
1280        int status;
1281        int type = dquot->dq_id.type;
1282        struct ocfs2_dquot *od = OCFS2_DQUOT(dquot);
1283        struct super_block *sb = dquot->dq_sb;
1284        struct ocfs2_local_disk_chunk *dchunk;
1285        int offset;
1286
1287        status = ocfs2_journal_access_dq(handle,
1288                        INODE_CACHE(sb_dqopt(sb)->files[type]),
1289                        od->dq_chunk->qc_headerbh, OCFS2_JOURNAL_ACCESS_WRITE);
1290        if (status < 0) {
1291                mlog_errno(status);
1292                goto out;
1293        }
1294        offset = ol_dqblk_chunk_off(sb, od->dq_chunk->qc_num,
1295                                             od->dq_local_off);
1296        dchunk = (struct ocfs2_local_disk_chunk *)
1297                        (od->dq_chunk->qc_headerbh->b_data);
1298        /* Mark structure as freed */
1299        lock_buffer(od->dq_chunk->qc_headerbh);
1300        ocfs2_clear_bit_unaligned(offset, dchunk->dqc_bitmap);
1301        le32_add_cpu(&dchunk->dqc_free, 1);
1302        unlock_buffer(od->dq_chunk->qc_headerbh);
1303        ocfs2_journal_dirty(handle, od->dq_chunk->qc_headerbh);
1304
1305out:
1306        /* Clear the read bit so that next time someone uses this
1307         * dquot he reads fresh info from disk and allocates local
1308         * dquot structure */
1309        clear_bit(DQ_READ_B, &dquot->dq_flags);
1310        return status;
1311}
1312
1313static const struct quota_format_ops ocfs2_format_ops = {
1314        .check_quota_file       = ocfs2_local_check_quota_file,
1315        .read_file_info         = ocfs2_local_read_info,
1316        .write_file_info        = ocfs2_global_write_info,
1317        .free_file_info         = ocfs2_local_free_info,
1318};
1319
1320struct quota_format_type ocfs2_quota_format = {
1321        .qf_fmt_id = QFMT_OCFS2,
1322        .qf_ops = &ocfs2_format_ops,
1323        .qf_owner = THIS_MODULE
1324};
1325
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