linux/fs/ocfs2/quota_global.c
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   1/*
   2 *  Implementation of operations over global quota file
   3 */
   4#include <linux/spinlock.h>
   5#include <linux/fs.h>
   6#include <linux/slab.h>
   7#include <linux/quota.h>
   8#include <linux/quotaops.h>
   9#include <linux/dqblk_qtree.h>
  10#include <linux/jiffies.h>
  11#include <linux/writeback.h>
  12#include <linux/workqueue.h>
  13
  14#include <cluster/masklog.h>
  15
  16#include "ocfs2_fs.h"
  17#include "ocfs2.h"
  18#include "alloc.h"
  19#include "blockcheck.h"
  20#include "inode.h"
  21#include "journal.h"
  22#include "file.h"
  23#include "sysfile.h"
  24#include "dlmglue.h"
  25#include "uptodate.h"
  26#include "super.h"
  27#include "buffer_head_io.h"
  28#include "quota.h"
  29#include "ocfs2_trace.h"
  30
  31/*
  32 * Locking of quotas with OCFS2 is rather complex. Here are rules that
  33 * should be obeyed by all the functions:
  34 * - any write of quota structure (either to local or global file) is protected
  35 *   by dqio_mutex or dquot->dq_lock.
  36 * - any modification of global quota file holds inode cluster lock, i_mutex,
  37 *   and ip_alloc_sem of the global quota file (achieved by
  38 *   ocfs2_lock_global_qf). It also has to hold qinfo_lock.
  39 * - an allocation of new blocks for local quota file is protected by
  40 *   its ip_alloc_sem
  41 *
  42 * A rough sketch of locking dependencies (lf = local file, gf = global file):
  43 * Normal filesystem operation:
  44 *   start_trans -> dqio_mutex -> write to lf
  45 * Syncing of local and global file:
  46 *   ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
  47 *     write to gf
  48 *                                                     -> write to lf
  49 * Acquire dquot for the first time:
  50 *   dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
  51 *                                   -> alloc space for gf
  52 *                                   -> start_trans -> qinfo_lock -> write to gf
  53 *           -> ip_alloc_sem of lf -> alloc space for lf
  54 *           -> write to lf
  55 * Release last reference to dquot:
  56 *   dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
  57 *           -> write to lf
  58 * Note that all the above operations also hold the inode cluster lock of lf.
  59 * Recovery:
  60 *   inode cluster lock of recovered lf
  61 *     -> read bitmaps -> ip_alloc_sem of lf
  62 *     -> ocfs2_lock_global_qf -> start_trans -> dqio_mutex -> qinfo_lock ->
  63 *        write to gf
  64 */
  65
  66static void qsync_work_fn(struct work_struct *work);
  67
  68static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
  69{
  70        struct ocfs2_global_disk_dqblk *d = dp;
  71        struct mem_dqblk *m = &dquot->dq_dqb;
  72
  73        /* Update from disk only entries not set by the admin */
  74        if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
  75                m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
  76                m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
  77        }
  78        if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
  79                m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
  80        if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
  81                m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
  82                m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
  83        }
  84        if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
  85                m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
  86        if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
  87                m->dqb_btime = le64_to_cpu(d->dqb_btime);
  88        if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
  89                m->dqb_itime = le64_to_cpu(d->dqb_itime);
  90        OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
  91}
  92
  93static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
  94{
  95        struct ocfs2_global_disk_dqblk *d = dp;
  96        struct mem_dqblk *m = &dquot->dq_dqb;
  97
  98        d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
  99        d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
 100        d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
 101        d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
 102        d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
 103        d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
 104        d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
 105        d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
 106        d->dqb_btime = cpu_to_le64(m->dqb_btime);
 107        d->dqb_itime = cpu_to_le64(m->dqb_itime);
 108        d->dqb_pad1 = d->dqb_pad2 = 0;
 109}
 110
 111static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
 112{
 113        struct ocfs2_global_disk_dqblk *d = dp;
 114        struct ocfs2_mem_dqinfo *oinfo =
 115                        sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
 116
 117        if (qtree_entry_unused(&oinfo->dqi_gi, dp))
 118                return 0;
 119
 120        return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
 121                                le32_to_cpu(d->dqb_id)),
 122                      dquot->dq_id);
 123}
 124
 125struct qtree_fmt_operations ocfs2_global_ops = {
 126        .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
 127        .disk2mem_dqblk = ocfs2_global_disk2memdqb,
 128        .is_id = ocfs2_global_is_id,
 129};
 130
 131int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
 132{
 133        struct ocfs2_disk_dqtrailer *dqt =
 134                ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
 135
 136        trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
 137
 138        BUG_ON(!buffer_uptodate(bh));
 139
 140        /*
 141         * If the ecc fails, we return the error but otherwise
 142         * leave the filesystem running.  We know any error is
 143         * local to this block.
 144         */
 145        return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
 146}
 147
 148int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
 149                                struct buffer_head **bhp)
 150{
 151        int rc;
 152
 153        *bhp = NULL;
 154        rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
 155                               ocfs2_validate_quota_block);
 156        if (rc)
 157                mlog_errno(rc);
 158        return rc;
 159}
 160
 161/* Read data from global quotafile - avoid pagecache and such because we cannot
 162 * afford acquiring the locks... We use quota cluster lock to serialize
 163 * operations. Caller is responsible for acquiring it. */
 164ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
 165                         size_t len, loff_t off)
 166{
 167        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 168        struct inode *gqinode = oinfo->dqi_gqinode;
 169        loff_t i_size = i_size_read(gqinode);
 170        int offset = off & (sb->s_blocksize - 1);
 171        sector_t blk = off >> sb->s_blocksize_bits;
 172        int err = 0;
 173        struct buffer_head *bh;
 174        size_t toread, tocopy;
 175        u64 pblock = 0, pcount = 0;
 176
 177        if (off > i_size)
 178                return 0;
 179        if (off + len > i_size)
 180                len = i_size - off;
 181        toread = len;
 182        while (toread > 0) {
 183                tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
 184                if (!pcount) {
 185                        err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
 186                                                          &pcount, NULL);
 187                        if (err) {
 188                                mlog_errno(err);
 189                                return err;
 190                        }
 191                } else {
 192                        pcount--;
 193                        pblock++;
 194                }
 195                bh = NULL;
 196                err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
 197                if (err) {
 198                        mlog_errno(err);
 199                        return err;
 200                }
 201                memcpy(data, bh->b_data + offset, tocopy);
 202                brelse(bh);
 203                offset = 0;
 204                toread -= tocopy;
 205                data += tocopy;
 206                blk++;
 207        }
 208        return len;
 209}
 210
 211/* Write to quotafile (we know the transaction is already started and has
 212 * enough credits) */
 213ssize_t ocfs2_quota_write(struct super_block *sb, int type,
 214                          const char *data, size_t len, loff_t off)
 215{
 216        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 217        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 218        struct inode *gqinode = oinfo->dqi_gqinode;
 219        int offset = off & (sb->s_blocksize - 1);
 220        sector_t blk = off >> sb->s_blocksize_bits;
 221        int err = 0, new = 0, ja_type;
 222        struct buffer_head *bh = NULL;
 223        handle_t *handle = journal_current_handle();
 224        u64 pblock, pcount;
 225
 226        if (!handle) {
 227                mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
 228                     "because transaction was not started.\n",
 229                     (unsigned long long)off, (unsigned long long)len);
 230                return -EIO;
 231        }
 232        if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
 233                WARN_ON(1);
 234                len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
 235        }
 236
 237        if (gqinode->i_size < off + len) {
 238                loff_t rounded_end =
 239                                ocfs2_align_bytes_to_blocks(sb, off + len);
 240
 241                /* Space is already allocated in ocfs2_acquire_dquot() */
 242                err = ocfs2_simple_size_update(gqinode,
 243                                               oinfo->dqi_gqi_bh,
 244                                               rounded_end);
 245                if (err < 0)
 246                        goto out;
 247                new = 1;
 248        }
 249        err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
 250        if (err) {
 251                mlog_errno(err);
 252                goto out;
 253        }
 254        /* Not rewriting whole block? */
 255        if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
 256            !new) {
 257                err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
 258                ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
 259        } else {
 260                bh = sb_getblk(sb, pblock);
 261                if (!bh)
 262                        err = -ENOMEM;
 263                ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
 264        }
 265        if (err) {
 266                mlog_errno(err);
 267                goto out;
 268        }
 269        lock_buffer(bh);
 270        if (new)
 271                memset(bh->b_data, 0, sb->s_blocksize);
 272        memcpy(bh->b_data + offset, data, len);
 273        flush_dcache_page(bh->b_page);
 274        set_buffer_uptodate(bh);
 275        unlock_buffer(bh);
 276        ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
 277        err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
 278                                      ja_type);
 279        if (err < 0) {
 280                brelse(bh);
 281                goto out;
 282        }
 283        ocfs2_journal_dirty(handle, bh);
 284        brelse(bh);
 285out:
 286        if (err) {
 287                mlog_errno(err);
 288                return err;
 289        }
 290        gqinode->i_version++;
 291        ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
 292        return len;
 293}
 294
 295int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 296{
 297        int status;
 298        struct buffer_head *bh = NULL;
 299
 300        status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
 301        if (status < 0)
 302                return status;
 303        spin_lock(&dq_data_lock);
 304        if (!oinfo->dqi_gqi_count++)
 305                oinfo->dqi_gqi_bh = bh;
 306        else
 307                WARN_ON(bh != oinfo->dqi_gqi_bh);
 308        spin_unlock(&dq_data_lock);
 309        if (ex) {
 310                mutex_lock(&oinfo->dqi_gqinode->i_mutex);
 311                down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 312        } else {
 313                down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 314        }
 315        return 0;
 316}
 317
 318void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 319{
 320        if (ex) {
 321                up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 322                mutex_unlock(&oinfo->dqi_gqinode->i_mutex);
 323        } else {
 324                up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 325        }
 326        ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
 327        brelse(oinfo->dqi_gqi_bh);
 328        spin_lock(&dq_data_lock);
 329        if (!--oinfo->dqi_gqi_count)
 330                oinfo->dqi_gqi_bh = NULL;
 331        spin_unlock(&dq_data_lock);
 332}
 333
 334/* Read information header from global quota file */
 335int ocfs2_global_read_info(struct super_block *sb, int type)
 336{
 337        struct inode *gqinode = NULL;
 338        unsigned int ino[MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 339                                        GROUP_QUOTA_SYSTEM_INODE };
 340        struct ocfs2_global_disk_dqinfo dinfo;
 341        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 342        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 343        u64 pcount;
 344        int status;
 345
 346        /* Read global header */
 347        gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 348                        OCFS2_INVALID_SLOT);
 349        if (!gqinode) {
 350                mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
 351                        type);
 352                status = -EINVAL;
 353                goto out_err;
 354        }
 355        oinfo->dqi_gi.dqi_sb = sb;
 356        oinfo->dqi_gi.dqi_type = type;
 357        ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
 358        oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
 359        oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
 360        oinfo->dqi_gqi_bh = NULL;
 361        oinfo->dqi_gqi_count = 0;
 362        oinfo->dqi_gqinode = gqinode;
 363        status = ocfs2_lock_global_qf(oinfo, 0);
 364        if (status < 0) {
 365                mlog_errno(status);
 366                goto out_err;
 367        }
 368
 369        status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk,
 370                                             &pcount, NULL);
 371        if (status < 0)
 372                goto out_unlock;
 373
 374        status = ocfs2_qinfo_lock(oinfo, 0);
 375        if (status < 0)
 376                goto out_unlock;
 377        status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 378                                      sizeof(struct ocfs2_global_disk_dqinfo),
 379                                      OCFS2_GLOBAL_INFO_OFF);
 380        ocfs2_qinfo_unlock(oinfo, 0);
 381        ocfs2_unlock_global_qf(oinfo, 0);
 382        if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
 383                mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
 384                     status);
 385                if (status >= 0)
 386                        status = -EIO;
 387                mlog_errno(status);
 388                goto out_err;
 389        }
 390        info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
 391        info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
 392        oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
 393        oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
 394        oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
 395        oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
 396        oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
 397        oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
 398                                                OCFS2_QBLK_RESERVED_SPACE;
 399        oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
 400        INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
 401        schedule_delayed_work(&oinfo->dqi_sync_work,
 402                              msecs_to_jiffies(oinfo->dqi_syncms));
 403
 404out_err:
 405        return status;
 406out_unlock:
 407        ocfs2_unlock_global_qf(oinfo, 0);
 408        mlog_errno(status);
 409        goto out_err;
 410}
 411
 412/* Write information to global quota file. Expects exlusive lock on quota
 413 * file inode and quota info */
 414static int __ocfs2_global_write_info(struct super_block *sb, int type)
 415{
 416        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 417        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 418        struct ocfs2_global_disk_dqinfo dinfo;
 419        ssize_t size;
 420
 421        spin_lock(&dq_data_lock);
 422        info->dqi_flags &= ~DQF_INFO_DIRTY;
 423        dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
 424        dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
 425        spin_unlock(&dq_data_lock);
 426        dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
 427        dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
 428        dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
 429        dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
 430        size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
 431                                     sizeof(struct ocfs2_global_disk_dqinfo),
 432                                     OCFS2_GLOBAL_INFO_OFF);
 433        if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
 434                mlog(ML_ERROR, "Cannot write global quota info structure\n");
 435                if (size >= 0)
 436                        size = -EIO;
 437                return size;
 438        }
 439        return 0;
 440}
 441
 442int ocfs2_global_write_info(struct super_block *sb, int type)
 443{
 444        int err;
 445        struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 446
 447        err = ocfs2_qinfo_lock(info, 1);
 448        if (err < 0)
 449                return err;
 450        err = __ocfs2_global_write_info(sb, type);
 451        ocfs2_qinfo_unlock(info, 1);
 452        return err;
 453}
 454
 455static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
 456{
 457        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 458
 459        /*
 460         * We may need to allocate tree blocks and a leaf block but not the
 461         * root block
 462         */
 463        return oinfo->dqi_gi.dqi_qtree_depth;
 464}
 465
 466static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
 467{
 468        /* We modify all the allocated blocks, tree root, info block and
 469         * the inode */
 470        return (ocfs2_global_qinit_alloc(sb, type) + 2) *
 471                        OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
 472}
 473
 474/* Sync local information about quota modifications with global quota file.
 475 * Caller must have started the transaction and obtained exclusive lock for
 476 * global quota file inode */
 477int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
 478{
 479        int err, err2;
 480        struct super_block *sb = dquot->dq_sb;
 481        int type = dquot->dq_id.type;
 482        struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 483        struct ocfs2_global_disk_dqblk dqblk;
 484        s64 spacechange, inodechange;
 485        time_t olditime, oldbtime;
 486
 487        err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
 488                                   sizeof(struct ocfs2_global_disk_dqblk),
 489                                   dquot->dq_off);
 490        if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
 491                if (err >= 0) {
 492                        mlog(ML_ERROR, "Short read from global quota file "
 493                                       "(%u read)\n", err);
 494                        err = -EIO;
 495                }
 496                goto out;
 497        }
 498
 499        /* Update space and inode usage. Get also other information from
 500         * global quota file so that we don't overwrite any changes there.
 501         * We are */
 502        spin_lock(&dq_data_lock);
 503        spacechange = dquot->dq_dqb.dqb_curspace -
 504                                        OCFS2_DQUOT(dquot)->dq_origspace;
 505        inodechange = dquot->dq_dqb.dqb_curinodes -
 506                                        OCFS2_DQUOT(dquot)->dq_originodes;
 507        olditime = dquot->dq_dqb.dqb_itime;
 508        oldbtime = dquot->dq_dqb.dqb_btime;
 509        ocfs2_global_disk2memdqb(dquot, &dqblk);
 510        trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id),
 511                               dquot->dq_dqb.dqb_curspace,
 512                               (long long)spacechange,
 513                               dquot->dq_dqb.dqb_curinodes,
 514                               (long long)inodechange);
 515        if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 516                dquot->dq_dqb.dqb_curspace += spacechange;
 517        if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 518                dquot->dq_dqb.dqb_curinodes += inodechange;
 519        /* Set properly space grace time... */
 520        if (dquot->dq_dqb.dqb_bsoftlimit &&
 521            dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
 522                if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
 523                    oldbtime > 0) {
 524                        if (dquot->dq_dqb.dqb_btime > 0)
 525                                dquot->dq_dqb.dqb_btime =
 526                                        min(dquot->dq_dqb.dqb_btime, oldbtime);
 527                        else
 528                                dquot->dq_dqb.dqb_btime = oldbtime;
 529                }
 530        } else {
 531                dquot->dq_dqb.dqb_btime = 0;
 532                clear_bit(DQ_BLKS_B, &dquot->dq_flags);
 533        }
 534        /* Set properly inode grace time... */
 535        if (dquot->dq_dqb.dqb_isoftlimit &&
 536            dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
 537                if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
 538                    olditime > 0) {
 539                        if (dquot->dq_dqb.dqb_itime > 0)
 540                                dquot->dq_dqb.dqb_itime =
 541                                        min(dquot->dq_dqb.dqb_itime, olditime);
 542                        else
 543                                dquot->dq_dqb.dqb_itime = olditime;
 544                }
 545        } else {
 546                dquot->dq_dqb.dqb_itime = 0;
 547                clear_bit(DQ_INODES_B, &dquot->dq_flags);
 548        }
 549        /* All information is properly updated, clear the flags */
 550        __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
 551        __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
 552        __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
 553        __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
 554        __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
 555        __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
 556        OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 557        OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 558        spin_unlock(&dq_data_lock);
 559        err = ocfs2_qinfo_lock(info, freeing);
 560        if (err < 0) {
 561                mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
 562                               " (type=%d, id=%u)\n", dquot->dq_id.type,
 563                               (unsigned)from_kqid(&init_user_ns, dquot->dq_id));
 564                goto out;
 565        }
 566        if (freeing)
 567                OCFS2_DQUOT(dquot)->dq_use_count--;
 568        err = qtree_write_dquot(&info->dqi_gi, dquot);
 569        if (err < 0)
 570                goto out_qlock;
 571        if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
 572                err = qtree_release_dquot(&info->dqi_gi, dquot);
 573                if (info_dirty(sb_dqinfo(sb, type))) {
 574                        err2 = __ocfs2_global_write_info(sb, type);
 575                        if (!err)
 576                                err = err2;
 577                }
 578        }
 579out_qlock:
 580        ocfs2_qinfo_unlock(info, freeing);
 581out:
 582        if (err < 0)
 583                mlog_errno(err);
 584        return err;
 585}
 586
 587/*
 588 *  Functions for periodic syncing of dquots with global file
 589 */
 590static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
 591{
 592        handle_t *handle;
 593        struct super_block *sb = dquot->dq_sb;
 594        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 595        struct ocfs2_super *osb = OCFS2_SB(sb);
 596        int status = 0;
 597
 598        trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id),
 599                                      dquot->dq_id.type,
 600                                      type, sb->s_id);
 601        if (type != dquot->dq_id.type)
 602                goto out;
 603        status = ocfs2_lock_global_qf(oinfo, 1);
 604        if (status < 0)
 605                goto out;
 606
 607        handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 608        if (IS_ERR(handle)) {
 609                status = PTR_ERR(handle);
 610                mlog_errno(status);
 611                goto out_ilock;
 612        }
 613        mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 614        status = ocfs2_sync_dquot(dquot);
 615        if (status < 0)
 616                mlog_errno(status);
 617        /* We have to write local structure as well... */
 618        status = ocfs2_local_write_dquot(dquot);
 619        if (status < 0)
 620                mlog_errno(status);
 621        mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 622        ocfs2_commit_trans(osb, handle);
 623out_ilock:
 624        ocfs2_unlock_global_qf(oinfo, 1);
 625out:
 626        return status;
 627}
 628
 629static void qsync_work_fn(struct work_struct *work)
 630{
 631        struct ocfs2_mem_dqinfo *oinfo = container_of(work,
 632                                                      struct ocfs2_mem_dqinfo,
 633                                                      dqi_sync_work.work);
 634        struct super_block *sb = oinfo->dqi_gqinode->i_sb;
 635
 636        dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
 637        schedule_delayed_work(&oinfo->dqi_sync_work,
 638                              msecs_to_jiffies(oinfo->dqi_syncms));
 639}
 640
 641/*
 642 *  Wrappers for generic quota functions
 643 */
 644
 645static int ocfs2_write_dquot(struct dquot *dquot)
 646{
 647        handle_t *handle;
 648        struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 649        int status = 0;
 650
 651        trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id),
 652                                dquot->dq_id.type);
 653
 654        handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
 655        if (IS_ERR(handle)) {
 656                status = PTR_ERR(handle);
 657                mlog_errno(status);
 658                goto out;
 659        }
 660        mutex_lock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
 661        status = ocfs2_local_write_dquot(dquot);
 662        mutex_unlock(&sb_dqopt(dquot->dq_sb)->dqio_mutex);
 663        ocfs2_commit_trans(osb, handle);
 664out:
 665        return status;
 666}
 667
 668static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
 669{
 670        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 671        /*
 672         * We modify tree, leaf block, global info, local chunk header,
 673         * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
 674         * accounts for inode update
 675         */
 676        return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
 677               OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
 678               OCFS2_QINFO_WRITE_CREDITS +
 679               OCFS2_INODE_UPDATE_CREDITS;
 680}
 681
 682static int ocfs2_release_dquot(struct dquot *dquot)
 683{
 684        handle_t *handle;
 685        struct ocfs2_mem_dqinfo *oinfo =
 686                        sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
 687        struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 688        int status = 0;
 689
 690        trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id),
 691                                  dquot->dq_id.type);
 692
 693        mutex_lock(&dquot->dq_lock);
 694        /* Check whether we are not racing with some other dqget() */
 695        if (atomic_read(&dquot->dq_count) > 1)
 696                goto out;
 697        status = ocfs2_lock_global_qf(oinfo, 1);
 698        if (status < 0)
 699                goto out;
 700        handle = ocfs2_start_trans(osb,
 701                ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type));
 702        if (IS_ERR(handle)) {
 703                status = PTR_ERR(handle);
 704                mlog_errno(status);
 705                goto out_ilock;
 706        }
 707
 708        status = ocfs2_global_release_dquot(dquot);
 709        if (status < 0) {
 710                mlog_errno(status);
 711                goto out_trans;
 712        }
 713        status = ocfs2_local_release_dquot(handle, dquot);
 714        /*
 715         * If we fail here, we cannot do much as global structure is
 716         * already released. So just complain...
 717         */
 718        if (status < 0)
 719                mlog_errno(status);
 720        clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
 721out_trans:
 722        ocfs2_commit_trans(osb, handle);
 723out_ilock:
 724        ocfs2_unlock_global_qf(oinfo, 1);
 725out:
 726        mutex_unlock(&dquot->dq_lock);
 727        if (status)
 728                mlog_errno(status);
 729        return status;
 730}
 731
 732/*
 733 * Read global dquot structure from disk or create it if it does
 734 * not exist. Also update use count of the global structure and
 735 * create structure in node-local quota file.
 736 */
 737static int ocfs2_acquire_dquot(struct dquot *dquot)
 738{
 739        int status = 0, err;
 740        int ex = 0;
 741        struct super_block *sb = dquot->dq_sb;
 742        struct ocfs2_super *osb = OCFS2_SB(sb);
 743        int type = dquot->dq_id.type;
 744        struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 745        struct inode *gqinode = info->dqi_gqinode;
 746        int need_alloc = ocfs2_global_qinit_alloc(sb, type);
 747        handle_t *handle;
 748
 749        trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id),
 750                                  type);
 751        mutex_lock(&dquot->dq_lock);
 752        /*
 753         * We need an exclusive lock, because we're going to update use count
 754         * and instantiate possibly new dquot structure
 755         */
 756        status = ocfs2_lock_global_qf(info, 1);
 757        if (status < 0)
 758                goto out;
 759        if (!test_bit(DQ_READ_B, &dquot->dq_flags)) {
 760                status = ocfs2_qinfo_lock(info, 0);
 761                if (status < 0)
 762                        goto out_dq;
 763                status = qtree_read_dquot(&info->dqi_gi, dquot);
 764                ocfs2_qinfo_unlock(info, 0);
 765                if (status < 0)
 766                        goto out_dq;
 767        }
 768        set_bit(DQ_READ_B, &dquot->dq_flags);
 769
 770        OCFS2_DQUOT(dquot)->dq_use_count++;
 771        OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 772        OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 773        if (!dquot->dq_off) {   /* No real quota entry? */
 774                ex = 1;
 775                /*
 776                 * Add blocks to quota file before we start a transaction since
 777                 * locking allocators ranks above a transaction start
 778                 */
 779                WARN_ON(journal_current_handle());
 780                status = ocfs2_extend_no_holes(gqinode, NULL,
 781                        gqinode->i_size + (need_alloc << sb->s_blocksize_bits),
 782                        gqinode->i_size);
 783                if (status < 0)
 784                        goto out_dq;
 785        }
 786
 787        handle = ocfs2_start_trans(osb,
 788                                   ocfs2_calc_global_qinit_credits(sb, type));
 789        if (IS_ERR(handle)) {
 790                status = PTR_ERR(handle);
 791                goto out_dq;
 792        }
 793        status = ocfs2_qinfo_lock(info, ex);
 794        if (status < 0)
 795                goto out_trans;
 796        status = qtree_write_dquot(&info->dqi_gi, dquot);
 797        if (ex && info_dirty(sb_dqinfo(sb, type))) {
 798                err = __ocfs2_global_write_info(sb, type);
 799                if (!status)
 800                        status = err;
 801        }
 802        ocfs2_qinfo_unlock(info, ex);
 803out_trans:
 804        ocfs2_commit_trans(osb, handle);
 805out_dq:
 806        ocfs2_unlock_global_qf(info, 1);
 807        if (status < 0)
 808                goto out;
 809
 810        status = ocfs2_create_local_dquot(dquot);
 811        if (status < 0)
 812                goto out;
 813        set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
 814out:
 815        mutex_unlock(&dquot->dq_lock);
 816        if (status)
 817                mlog_errno(status);
 818        return status;
 819}
 820
 821static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
 822{
 823        unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
 824                             (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
 825                             (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
 826                             (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
 827                             (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
 828                             (1 << (DQ_LASTSET_B + QIF_ITIME_B));
 829        int sync = 0;
 830        int status;
 831        struct super_block *sb = dquot->dq_sb;
 832        int type = dquot->dq_id.type;
 833        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 834        handle_t *handle;
 835        struct ocfs2_super *osb = OCFS2_SB(sb);
 836
 837        trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id),
 838                                     type);
 839
 840        /* In case user set some limits, sync dquot immediately to global
 841         * quota file so that information propagates quicker */
 842        spin_lock(&dq_data_lock);
 843        if (dquot->dq_flags & mask)
 844                sync = 1;
 845        spin_unlock(&dq_data_lock);
 846        /* This is a slight hack but we can't afford getting global quota
 847         * lock if we already have a transaction started. */
 848        if (!sync || journal_current_handle()) {
 849                status = ocfs2_write_dquot(dquot);
 850                goto out;
 851        }
 852        status = ocfs2_lock_global_qf(oinfo, 1);
 853        if (status < 0)
 854                goto out;
 855        handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 856        if (IS_ERR(handle)) {
 857                status = PTR_ERR(handle);
 858                mlog_errno(status);
 859                goto out_ilock;
 860        }
 861        mutex_lock(&sb_dqopt(sb)->dqio_mutex);
 862        status = ocfs2_sync_dquot(dquot);
 863        if (status < 0) {
 864                mlog_errno(status);
 865                goto out_dlock;
 866        }
 867        /* Now write updated local dquot structure */
 868        status = ocfs2_local_write_dquot(dquot);
 869out_dlock:
 870        mutex_unlock(&sb_dqopt(sb)->dqio_mutex);
 871        ocfs2_commit_trans(osb, handle);
 872out_ilock:
 873        ocfs2_unlock_global_qf(oinfo, 1);
 874out:
 875        if (status)
 876                mlog_errno(status);
 877        return status;
 878}
 879
 880/* This should happen only after set_dqinfo(). */
 881static int ocfs2_write_info(struct super_block *sb, int type)
 882{
 883        handle_t *handle;
 884        int status = 0;
 885        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 886
 887        status = ocfs2_lock_global_qf(oinfo, 1);
 888        if (status < 0)
 889                goto out;
 890        handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
 891        if (IS_ERR(handle)) {
 892                status = PTR_ERR(handle);
 893                mlog_errno(status);
 894                goto out_ilock;
 895        }
 896        status = dquot_commit_info(sb, type);
 897        ocfs2_commit_trans(OCFS2_SB(sb), handle);
 898out_ilock:
 899        ocfs2_unlock_global_qf(oinfo, 1);
 900out:
 901        if (status)
 902                mlog_errno(status);
 903        return status;
 904}
 905
 906static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
 907{
 908        struct ocfs2_dquot *dquot =
 909                                kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
 910
 911        if (!dquot)
 912                return NULL;
 913        return &dquot->dq_dquot;
 914}
 915
 916static void ocfs2_destroy_dquot(struct dquot *dquot)
 917{
 918        kmem_cache_free(ocfs2_dquot_cachep, dquot);
 919}
 920
 921const struct dquot_operations ocfs2_quota_operations = {
 922        /* We never make dquot dirty so .write_dquot is never called */
 923        .acquire_dquot  = ocfs2_acquire_dquot,
 924        .release_dquot  = ocfs2_release_dquot,
 925        .mark_dirty     = ocfs2_mark_dquot_dirty,
 926        .write_info     = ocfs2_write_info,
 927        .alloc_dquot    = ocfs2_alloc_dquot,
 928        .destroy_dquot  = ocfs2_destroy_dquot,
 929};
 930
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