linux/fs/ocfs2/quota_global.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  Implementation of operations over global quota file
   4 */
   5#include <linux/spinlock.h>
   6#include <linux/fs.h>
   7#include <linux/slab.h>
   8#include <linux/quota.h>
   9#include <linux/quotaops.h>
  10#include <linux/dqblk_qtree.h>
  11#include <linux/jiffies.h>
  12#include <linux/writeback.h>
  13#include <linux/workqueue.h>
  14#include <linux/llist.h>
  15
  16#include <cluster/masklog.h>
  17
  18#include "ocfs2_fs.h"
  19#include "ocfs2.h"
  20#include "alloc.h"
  21#include "blockcheck.h"
  22#include "inode.h"
  23#include "journal.h"
  24#include "file.h"
  25#include "sysfile.h"
  26#include "dlmglue.h"
  27#include "uptodate.h"
  28#include "super.h"
  29#include "buffer_head_io.h"
  30#include "quota.h"
  31#include "ocfs2_trace.h"
  32
  33/*
  34 * Locking of quotas with OCFS2 is rather complex. Here are rules that
  35 * should be obeyed by all the functions:
  36 * - any write of quota structure (either to local or global file) is protected
  37 *   by dqio_sem or dquot->dq_lock.
  38 * - any modification of global quota file holds inode cluster lock, i_mutex,
  39 *   and ip_alloc_sem of the global quota file (achieved by
  40 *   ocfs2_lock_global_qf). It also has to hold qinfo_lock.
  41 * - an allocation of new blocks for local quota file is protected by
  42 *   its ip_alloc_sem
  43 *
  44 * A rough sketch of locking dependencies (lf = local file, gf = global file):
  45 * Normal filesystem operation:
  46 *   start_trans -> dqio_sem -> write to lf
  47 * Syncing of local and global file:
  48 *   ocfs2_lock_global_qf -> start_trans -> dqio_sem -> qinfo_lock ->
  49 *     write to gf
  50 *                                                     -> write to lf
  51 * Acquire dquot for the first time:
  52 *   dq_lock -> ocfs2_lock_global_qf -> qinfo_lock -> read from gf
  53 *                                   -> alloc space for gf
  54 *                                   -> start_trans -> qinfo_lock -> write to gf
  55 *           -> ip_alloc_sem of lf -> alloc space for lf
  56 *           -> write to lf
  57 * Release last reference to dquot:
  58 *   dq_lock -> ocfs2_lock_global_qf -> start_trans -> qinfo_lock -> write to gf
  59 *           -> write to lf
  60 * Note that all the above operations also hold the inode cluster lock of lf.
  61 * Recovery:
  62 *   inode cluster lock of recovered lf
  63 *     -> read bitmaps -> ip_alloc_sem of lf
  64 *     -> ocfs2_lock_global_qf -> start_trans -> dqio_sem -> qinfo_lock ->
  65 *        write to gf
  66 */
  67
  68static void qsync_work_fn(struct work_struct *work);
  69
  70static void ocfs2_global_disk2memdqb(struct dquot *dquot, void *dp)
  71{
  72        struct ocfs2_global_disk_dqblk *d = dp;
  73        struct mem_dqblk *m = &dquot->dq_dqb;
  74
  75        /* Update from disk only entries not set by the admin */
  76        if (!test_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags)) {
  77                m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit);
  78                m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit);
  79        }
  80        if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
  81                m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes);
  82        if (!test_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags)) {
  83                m->dqb_bhardlimit = le64_to_cpu(d->dqb_bhardlimit);
  84                m->dqb_bsoftlimit = le64_to_cpu(d->dqb_bsoftlimit);
  85        }
  86        if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
  87                m->dqb_curspace = le64_to_cpu(d->dqb_curspace);
  88        if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags))
  89                m->dqb_btime = le64_to_cpu(d->dqb_btime);
  90        if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags))
  91                m->dqb_itime = le64_to_cpu(d->dqb_itime);
  92        OCFS2_DQUOT(dquot)->dq_use_count = le32_to_cpu(d->dqb_use_count);
  93}
  94
  95static void ocfs2_global_mem2diskdqb(void *dp, struct dquot *dquot)
  96{
  97        struct ocfs2_global_disk_dqblk *d = dp;
  98        struct mem_dqblk *m = &dquot->dq_dqb;
  99
 100        d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id));
 101        d->dqb_use_count = cpu_to_le32(OCFS2_DQUOT(dquot)->dq_use_count);
 102        d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit);
 103        d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit);
 104        d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes);
 105        d->dqb_bhardlimit = cpu_to_le64(m->dqb_bhardlimit);
 106        d->dqb_bsoftlimit = cpu_to_le64(m->dqb_bsoftlimit);
 107        d->dqb_curspace = cpu_to_le64(m->dqb_curspace);
 108        d->dqb_btime = cpu_to_le64(m->dqb_btime);
 109        d->dqb_itime = cpu_to_le64(m->dqb_itime);
 110        d->dqb_pad1 = d->dqb_pad2 = 0;
 111}
 112
 113static int ocfs2_global_is_id(void *dp, struct dquot *dquot)
 114{
 115        struct ocfs2_global_disk_dqblk *d = dp;
 116        struct ocfs2_mem_dqinfo *oinfo =
 117                        sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
 118
 119        if (qtree_entry_unused(&oinfo->dqi_gi, dp))
 120                return 0;
 121
 122        return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type,
 123                                le32_to_cpu(d->dqb_id)),
 124                      dquot->dq_id);
 125}
 126
 127const struct qtree_fmt_operations ocfs2_global_ops = {
 128        .mem2disk_dqblk = ocfs2_global_mem2diskdqb,
 129        .disk2mem_dqblk = ocfs2_global_disk2memdqb,
 130        .is_id = ocfs2_global_is_id,
 131};
 132
 133int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh)
 134{
 135        struct ocfs2_disk_dqtrailer *dqt =
 136                ocfs2_block_dqtrailer(sb->s_blocksize, bh->b_data);
 137
 138        trace_ocfs2_validate_quota_block((unsigned long long)bh->b_blocknr);
 139
 140        BUG_ON(!buffer_uptodate(bh));
 141
 142        /*
 143         * If the ecc fails, we return the error but otherwise
 144         * leave the filesystem running.  We know any error is
 145         * local to this block.
 146         */
 147        return ocfs2_validate_meta_ecc(sb, bh->b_data, &dqt->dq_check);
 148}
 149
 150int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
 151                                struct buffer_head **bhp)
 152{
 153        int rc;
 154
 155        *bhp = NULL;
 156        rc = ocfs2_read_blocks(INODE_CACHE(inode), p_block, 1, bhp, 0,
 157                               ocfs2_validate_quota_block);
 158        if (rc)
 159                mlog_errno(rc);
 160        return rc;
 161}
 162
 163/* Read data from global quotafile - avoid pagecache and such because we cannot
 164 * afford acquiring the locks... We use quota cluster lock to serialize
 165 * operations. Caller is responsible for acquiring it. */
 166ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
 167                         size_t len, loff_t off)
 168{
 169        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 170        struct inode *gqinode = oinfo->dqi_gqinode;
 171        loff_t i_size = i_size_read(gqinode);
 172        int offset = off & (sb->s_blocksize - 1);
 173        sector_t blk = off >> sb->s_blocksize_bits;
 174        int err = 0;
 175        struct buffer_head *bh;
 176        size_t toread, tocopy;
 177        u64 pblock = 0, pcount = 0;
 178
 179        if (off > i_size)
 180                return 0;
 181        if (off + len > i_size)
 182                len = i_size - off;
 183        toread = len;
 184        while (toread > 0) {
 185                tocopy = min_t(size_t, (sb->s_blocksize - offset), toread);
 186                if (!pcount) {
 187                        err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock,
 188                                                          &pcount, NULL);
 189                        if (err) {
 190                                mlog_errno(err);
 191                                return err;
 192                        }
 193                } else {
 194                        pcount--;
 195                        pblock++;
 196                }
 197                bh = NULL;
 198                err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
 199                if (err) {
 200                        mlog_errno(err);
 201                        return err;
 202                }
 203                memcpy(data, bh->b_data + offset, tocopy);
 204                brelse(bh);
 205                offset = 0;
 206                toread -= tocopy;
 207                data += tocopy;
 208                blk++;
 209        }
 210        return len;
 211}
 212
 213/* Write to quotafile (we know the transaction is already started and has
 214 * enough credits) */
 215ssize_t ocfs2_quota_write(struct super_block *sb, int type,
 216                          const char *data, size_t len, loff_t off)
 217{
 218        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 219        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 220        struct inode *gqinode = oinfo->dqi_gqinode;
 221        int offset = off & (sb->s_blocksize - 1);
 222        sector_t blk = off >> sb->s_blocksize_bits;
 223        int err = 0, new = 0, ja_type;
 224        struct buffer_head *bh = NULL;
 225        handle_t *handle = journal_current_handle();
 226        u64 pblock, pcount;
 227
 228        if (!handle) {
 229                mlog(ML_ERROR, "Quota write (off=%llu, len=%llu) cancelled "
 230                     "because transaction was not started.\n",
 231                     (unsigned long long)off, (unsigned long long)len);
 232                return -EIO;
 233        }
 234        if (len > sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset) {
 235                WARN_ON(1);
 236                len = sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE - offset;
 237        }
 238
 239        if (i_size_read(gqinode) < off + len) {
 240                loff_t rounded_end =
 241                                ocfs2_align_bytes_to_blocks(sb, off + len);
 242
 243                /* Space is already allocated in ocfs2_acquire_dquot() */
 244                err = ocfs2_simple_size_update(gqinode,
 245                                               oinfo->dqi_gqi_bh,
 246                                               rounded_end);
 247                if (err < 0)
 248                        goto out;
 249                new = 1;
 250        }
 251        err = ocfs2_extent_map_get_blocks(gqinode, blk, &pblock, &pcount, NULL);
 252        if (err) {
 253                mlog_errno(err);
 254                goto out;
 255        }
 256        /* Not rewriting whole block? */
 257        if ((offset || len < sb->s_blocksize - OCFS2_QBLK_RESERVED_SPACE) &&
 258            !new) {
 259                err = ocfs2_read_quota_phys_block(gqinode, pblock, &bh);
 260                ja_type = OCFS2_JOURNAL_ACCESS_WRITE;
 261        } else {
 262                bh = sb_getblk(sb, pblock);
 263                if (!bh)
 264                        err = -ENOMEM;
 265                ja_type = OCFS2_JOURNAL_ACCESS_CREATE;
 266        }
 267        if (err) {
 268                mlog_errno(err);
 269                goto out;
 270        }
 271        lock_buffer(bh);
 272        if (new)
 273                memset(bh->b_data, 0, sb->s_blocksize);
 274        memcpy(bh->b_data + offset, data, len);
 275        flush_dcache_page(bh->b_page);
 276        set_buffer_uptodate(bh);
 277        unlock_buffer(bh);
 278        ocfs2_set_buffer_uptodate(INODE_CACHE(gqinode), bh);
 279        err = ocfs2_journal_access_dq(handle, INODE_CACHE(gqinode), bh,
 280                                      ja_type);
 281        if (err < 0) {
 282                brelse(bh);
 283                goto out;
 284        }
 285        ocfs2_journal_dirty(handle, bh);
 286        brelse(bh);
 287out:
 288        if (err) {
 289                mlog_errno(err);
 290                return err;
 291        }
 292        gqinode->i_version++;
 293        ocfs2_mark_inode_dirty(handle, gqinode, oinfo->dqi_gqi_bh);
 294        return len;
 295}
 296
 297int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 298{
 299        int status;
 300        struct buffer_head *bh = NULL;
 301
 302        status = ocfs2_inode_lock(oinfo->dqi_gqinode, &bh, ex);
 303        if (status < 0)
 304                return status;
 305        spin_lock(&dq_data_lock);
 306        if (!oinfo->dqi_gqi_count++)
 307                oinfo->dqi_gqi_bh = bh;
 308        else
 309                WARN_ON(bh != oinfo->dqi_gqi_bh);
 310        spin_unlock(&dq_data_lock);
 311        if (ex) {
 312                inode_lock(oinfo->dqi_gqinode);
 313                down_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 314        } else {
 315                down_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 316        }
 317        return 0;
 318}
 319
 320void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex)
 321{
 322        if (ex) {
 323                up_write(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 324                inode_unlock(oinfo->dqi_gqinode);
 325        } else {
 326                up_read(&OCFS2_I(oinfo->dqi_gqinode)->ip_alloc_sem);
 327        }
 328        ocfs2_inode_unlock(oinfo->dqi_gqinode, ex);
 329        brelse(oinfo->dqi_gqi_bh);
 330        spin_lock(&dq_data_lock);
 331        if (!--oinfo->dqi_gqi_count)
 332                oinfo->dqi_gqi_bh = NULL;
 333        spin_unlock(&dq_data_lock);
 334}
 335
 336/* Read information header from global quota file */
 337int ocfs2_global_read_info(struct super_block *sb, int type)
 338{
 339        struct inode *gqinode = NULL;
 340        unsigned int ino[OCFS2_MAXQUOTAS] = { USER_QUOTA_SYSTEM_INODE,
 341                                              GROUP_QUOTA_SYSTEM_INODE };
 342        struct ocfs2_global_disk_dqinfo dinfo;
 343        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 344        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 345        u64 pcount;
 346        int status;
 347
 348        /* Read global header */
 349        gqinode = ocfs2_get_system_file_inode(OCFS2_SB(sb), ino[type],
 350                        OCFS2_INVALID_SLOT);
 351        if (!gqinode) {
 352                mlog(ML_ERROR, "failed to get global quota inode (type=%d)\n",
 353                        type);
 354                status = -EINVAL;
 355                goto out_err;
 356        }
 357        oinfo->dqi_gi.dqi_sb = sb;
 358        oinfo->dqi_gi.dqi_type = type;
 359        ocfs2_qinfo_lock_res_init(&oinfo->dqi_gqlock, oinfo);
 360        oinfo->dqi_gi.dqi_entry_size = sizeof(struct ocfs2_global_disk_dqblk);
 361        oinfo->dqi_gi.dqi_ops = &ocfs2_global_ops;
 362        oinfo->dqi_gqi_bh = NULL;
 363        oinfo->dqi_gqi_count = 0;
 364        oinfo->dqi_gqinode = gqinode;
 365        status = ocfs2_lock_global_qf(oinfo, 0);
 366        if (status < 0) {
 367                mlog_errno(status);
 368                goto out_err;
 369        }
 370
 371        status = ocfs2_extent_map_get_blocks(gqinode, 0, &oinfo->dqi_giblk,
 372                                             &pcount, NULL);
 373        if (status < 0)
 374                goto out_unlock;
 375
 376        status = ocfs2_qinfo_lock(oinfo, 0);
 377        if (status < 0)
 378                goto out_unlock;
 379        status = sb->s_op->quota_read(sb, type, (char *)&dinfo,
 380                                      sizeof(struct ocfs2_global_disk_dqinfo),
 381                                      OCFS2_GLOBAL_INFO_OFF);
 382        ocfs2_qinfo_unlock(oinfo, 0);
 383        ocfs2_unlock_global_qf(oinfo, 0);
 384        if (status != sizeof(struct ocfs2_global_disk_dqinfo)) {
 385                mlog(ML_ERROR, "Cannot read global quota info (%d).\n",
 386                     status);
 387                if (status >= 0)
 388                        status = -EIO;
 389                mlog_errno(status);
 390                goto out_err;
 391        }
 392        info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace);
 393        info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace);
 394        oinfo->dqi_syncms = le32_to_cpu(dinfo.dqi_syncms);
 395        oinfo->dqi_gi.dqi_blocks = le32_to_cpu(dinfo.dqi_blocks);
 396        oinfo->dqi_gi.dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk);
 397        oinfo->dqi_gi.dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry);
 398        oinfo->dqi_gi.dqi_blocksize_bits = sb->s_blocksize_bits;
 399        oinfo->dqi_gi.dqi_usable_bs = sb->s_blocksize -
 400                                                OCFS2_QBLK_RESERVED_SPACE;
 401        oinfo->dqi_gi.dqi_qtree_depth = qtree_depth(&oinfo->dqi_gi);
 402        INIT_DELAYED_WORK(&oinfo->dqi_sync_work, qsync_work_fn);
 403        schedule_delayed_work(&oinfo->dqi_sync_work,
 404                              msecs_to_jiffies(oinfo->dqi_syncms));
 405
 406out_err:
 407        return status;
 408out_unlock:
 409        ocfs2_unlock_global_qf(oinfo, 0);
 410        mlog_errno(status);
 411        goto out_err;
 412}
 413
 414/* Write information to global quota file. Expects exlusive lock on quota
 415 * file inode and quota info */
 416static int __ocfs2_global_write_info(struct super_block *sb, int type)
 417{
 418        struct mem_dqinfo *info = sb_dqinfo(sb, type);
 419        struct ocfs2_mem_dqinfo *oinfo = info->dqi_priv;
 420        struct ocfs2_global_disk_dqinfo dinfo;
 421        ssize_t size;
 422
 423        spin_lock(&dq_data_lock);
 424        info->dqi_flags &= ~DQF_INFO_DIRTY;
 425        dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace);
 426        dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace);
 427        spin_unlock(&dq_data_lock);
 428        dinfo.dqi_syncms = cpu_to_le32(oinfo->dqi_syncms);
 429        dinfo.dqi_blocks = cpu_to_le32(oinfo->dqi_gi.dqi_blocks);
 430        dinfo.dqi_free_blk = cpu_to_le32(oinfo->dqi_gi.dqi_free_blk);
 431        dinfo.dqi_free_entry = cpu_to_le32(oinfo->dqi_gi.dqi_free_entry);
 432        size = sb->s_op->quota_write(sb, type, (char *)&dinfo,
 433                                     sizeof(struct ocfs2_global_disk_dqinfo),
 434                                     OCFS2_GLOBAL_INFO_OFF);
 435        if (size != sizeof(struct ocfs2_global_disk_dqinfo)) {
 436                mlog(ML_ERROR, "Cannot write global quota info structure\n");
 437                if (size >= 0)
 438                        size = -EIO;
 439                return size;
 440        }
 441        return 0;
 442}
 443
 444int ocfs2_global_write_info(struct super_block *sb, int type)
 445{
 446        int err;
 447        struct quota_info *dqopt = sb_dqopt(sb);
 448        struct ocfs2_mem_dqinfo *info = dqopt->info[type].dqi_priv;
 449
 450        down_write(&dqopt->dqio_sem);
 451        err = ocfs2_qinfo_lock(info, 1);
 452        if (err < 0)
 453                goto out_sem;
 454        err = __ocfs2_global_write_info(sb, type);
 455        ocfs2_qinfo_unlock(info, 1);
 456out_sem:
 457        up_write(&dqopt->dqio_sem);
 458        return err;
 459}
 460
 461static int ocfs2_global_qinit_alloc(struct super_block *sb, int type)
 462{
 463        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 464
 465        /*
 466         * We may need to allocate tree blocks and a leaf block but not the
 467         * root block
 468         */
 469        return oinfo->dqi_gi.dqi_qtree_depth;
 470}
 471
 472static int ocfs2_calc_global_qinit_credits(struct super_block *sb, int type)
 473{
 474        /* We modify all the allocated blocks, tree root, info block and
 475         * the inode */
 476        return (ocfs2_global_qinit_alloc(sb, type) + 2) *
 477                        OCFS2_QUOTA_BLOCK_UPDATE_CREDITS + 1;
 478}
 479
 480/* Sync local information about quota modifications with global quota file.
 481 * Caller must have started the transaction and obtained exclusive lock for
 482 * global quota file inode */
 483int __ocfs2_sync_dquot(struct dquot *dquot, int freeing)
 484{
 485        int err, err2;
 486        struct super_block *sb = dquot->dq_sb;
 487        int type = dquot->dq_id.type;
 488        struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 489        struct ocfs2_global_disk_dqblk dqblk;
 490        s64 spacechange, inodechange;
 491        time64_t olditime, oldbtime;
 492
 493        err = sb->s_op->quota_read(sb, type, (char *)&dqblk,
 494                                   sizeof(struct ocfs2_global_disk_dqblk),
 495                                   dquot->dq_off);
 496        if (err != sizeof(struct ocfs2_global_disk_dqblk)) {
 497                if (err >= 0) {
 498                        mlog(ML_ERROR, "Short read from global quota file "
 499                                       "(%u read)\n", err);
 500                        err = -EIO;
 501                }
 502                goto out;
 503        }
 504
 505        /* Update space and inode usage. Get also other information from
 506         * global quota file so that we don't overwrite any changes there.
 507         * We are */
 508        spin_lock(&dquot->dq_dqb_lock);
 509        spacechange = dquot->dq_dqb.dqb_curspace -
 510                                        OCFS2_DQUOT(dquot)->dq_origspace;
 511        inodechange = dquot->dq_dqb.dqb_curinodes -
 512                                        OCFS2_DQUOT(dquot)->dq_originodes;
 513        olditime = dquot->dq_dqb.dqb_itime;
 514        oldbtime = dquot->dq_dqb.dqb_btime;
 515        ocfs2_global_disk2memdqb(dquot, &dqblk);
 516        trace_ocfs2_sync_dquot(from_kqid(&init_user_ns, dquot->dq_id),
 517                               dquot->dq_dqb.dqb_curspace,
 518                               (long long)spacechange,
 519                               dquot->dq_dqb.dqb_curinodes,
 520                               (long long)inodechange);
 521        if (!test_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags))
 522                dquot->dq_dqb.dqb_curspace += spacechange;
 523        if (!test_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags))
 524                dquot->dq_dqb.dqb_curinodes += inodechange;
 525        /* Set properly space grace time... */
 526        if (dquot->dq_dqb.dqb_bsoftlimit &&
 527            dquot->dq_dqb.dqb_curspace > dquot->dq_dqb.dqb_bsoftlimit) {
 528                if (!test_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags) &&
 529                    oldbtime > 0) {
 530                        if (dquot->dq_dqb.dqb_btime > 0)
 531                                dquot->dq_dqb.dqb_btime =
 532                                        min(dquot->dq_dqb.dqb_btime, oldbtime);
 533                        else
 534                                dquot->dq_dqb.dqb_btime = oldbtime;
 535                }
 536        } else {
 537                dquot->dq_dqb.dqb_btime = 0;
 538                clear_bit(DQ_BLKS_B, &dquot->dq_flags);
 539        }
 540        /* Set properly inode grace time... */
 541        if (dquot->dq_dqb.dqb_isoftlimit &&
 542            dquot->dq_dqb.dqb_curinodes > dquot->dq_dqb.dqb_isoftlimit) {
 543                if (!test_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags) &&
 544                    olditime > 0) {
 545                        if (dquot->dq_dqb.dqb_itime > 0)
 546                                dquot->dq_dqb.dqb_itime =
 547                                        min(dquot->dq_dqb.dqb_itime, olditime);
 548                        else
 549                                dquot->dq_dqb.dqb_itime = olditime;
 550                }
 551        } else {
 552                dquot->dq_dqb.dqb_itime = 0;
 553                clear_bit(DQ_INODES_B, &dquot->dq_flags);
 554        }
 555        /* All information is properly updated, clear the flags */
 556        __clear_bit(DQ_LASTSET_B + QIF_SPACE_B, &dquot->dq_flags);
 557        __clear_bit(DQ_LASTSET_B + QIF_INODES_B, &dquot->dq_flags);
 558        __clear_bit(DQ_LASTSET_B + QIF_BLIMITS_B, &dquot->dq_flags);
 559        __clear_bit(DQ_LASTSET_B + QIF_ILIMITS_B, &dquot->dq_flags);
 560        __clear_bit(DQ_LASTSET_B + QIF_BTIME_B, &dquot->dq_flags);
 561        __clear_bit(DQ_LASTSET_B + QIF_ITIME_B, &dquot->dq_flags);
 562        OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 563        OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 564        spin_unlock(&dquot->dq_dqb_lock);
 565        err = ocfs2_qinfo_lock(info, freeing);
 566        if (err < 0) {
 567                mlog(ML_ERROR, "Failed to lock quota info, losing quota write"
 568                               " (type=%d, id=%u)\n", dquot->dq_id.type,
 569                               (unsigned)from_kqid(&init_user_ns, dquot->dq_id));
 570                goto out;
 571        }
 572        if (freeing)
 573                OCFS2_DQUOT(dquot)->dq_use_count--;
 574        err = qtree_write_dquot(&info->dqi_gi, dquot);
 575        if (err < 0)
 576                goto out_qlock;
 577        if (freeing && !OCFS2_DQUOT(dquot)->dq_use_count) {
 578                err = qtree_release_dquot(&info->dqi_gi, dquot);
 579                if (info_dirty(sb_dqinfo(sb, type))) {
 580                        err2 = __ocfs2_global_write_info(sb, type);
 581                        if (!err)
 582                                err = err2;
 583                }
 584        }
 585out_qlock:
 586        ocfs2_qinfo_unlock(info, freeing);
 587out:
 588        if (err < 0)
 589                mlog_errno(err);
 590        return err;
 591}
 592
 593/*
 594 *  Functions for periodic syncing of dquots with global file
 595 */
 596static int ocfs2_sync_dquot_helper(struct dquot *dquot, unsigned long type)
 597{
 598        handle_t *handle;
 599        struct super_block *sb = dquot->dq_sb;
 600        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 601        struct ocfs2_super *osb = OCFS2_SB(sb);
 602        int status = 0;
 603
 604        trace_ocfs2_sync_dquot_helper(from_kqid(&init_user_ns, dquot->dq_id),
 605                                      dquot->dq_id.type,
 606                                      type, sb->s_id);
 607        if (type != dquot->dq_id.type)
 608                goto out;
 609        status = ocfs2_lock_global_qf(oinfo, 1);
 610        if (status < 0)
 611                goto out;
 612
 613        handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 614        if (IS_ERR(handle)) {
 615                status = PTR_ERR(handle);
 616                mlog_errno(status);
 617                goto out_ilock;
 618        }
 619        down_write(&sb_dqopt(sb)->dqio_sem);
 620        status = ocfs2_sync_dquot(dquot);
 621        if (status < 0)
 622                mlog_errno(status);
 623        /* We have to write local structure as well... */
 624        status = ocfs2_local_write_dquot(dquot);
 625        if (status < 0)
 626                mlog_errno(status);
 627        up_write(&sb_dqopt(sb)->dqio_sem);
 628        ocfs2_commit_trans(osb, handle);
 629out_ilock:
 630        ocfs2_unlock_global_qf(oinfo, 1);
 631out:
 632        return status;
 633}
 634
 635static void qsync_work_fn(struct work_struct *work)
 636{
 637        struct ocfs2_mem_dqinfo *oinfo = container_of(work,
 638                                                      struct ocfs2_mem_dqinfo,
 639                                                      dqi_sync_work.work);
 640        struct super_block *sb = oinfo->dqi_gqinode->i_sb;
 641
 642        /*
 643         * We have to be careful here not to deadlock on s_umount as umount
 644         * disabling quotas may be in progress and it waits for this work to
 645         * complete. If trylock fails, we'll do the sync next time...
 646         */
 647        if (down_read_trylock(&sb->s_umount)) {
 648                dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type);
 649                up_read(&sb->s_umount);
 650        }
 651        schedule_delayed_work(&oinfo->dqi_sync_work,
 652                              msecs_to_jiffies(oinfo->dqi_syncms));
 653}
 654
 655/*
 656 *  Wrappers for generic quota functions
 657 */
 658
 659static int ocfs2_write_dquot(struct dquot *dquot)
 660{
 661        handle_t *handle;
 662        struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 663        int status = 0;
 664
 665        trace_ocfs2_write_dquot(from_kqid(&init_user_ns, dquot->dq_id),
 666                                dquot->dq_id.type);
 667
 668        handle = ocfs2_start_trans(osb, OCFS2_QWRITE_CREDITS);
 669        if (IS_ERR(handle)) {
 670                status = PTR_ERR(handle);
 671                mlog_errno(status);
 672                goto out;
 673        }
 674        down_write(&sb_dqopt(dquot->dq_sb)->dqio_sem);
 675        status = ocfs2_local_write_dquot(dquot);
 676        up_write(&sb_dqopt(dquot->dq_sb)->dqio_sem);
 677        ocfs2_commit_trans(osb, handle);
 678out:
 679        return status;
 680}
 681
 682static int ocfs2_calc_qdel_credits(struct super_block *sb, int type)
 683{
 684        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 685        /*
 686         * We modify tree, leaf block, global info, local chunk header,
 687         * global and local inode; OCFS2_QINFO_WRITE_CREDITS already
 688         * accounts for inode update
 689         */
 690        return (oinfo->dqi_gi.dqi_qtree_depth + 2) *
 691               OCFS2_QUOTA_BLOCK_UPDATE_CREDITS +
 692               OCFS2_QINFO_WRITE_CREDITS +
 693               OCFS2_INODE_UPDATE_CREDITS;
 694}
 695
 696void ocfs2_drop_dquot_refs(struct work_struct *work)
 697{
 698        struct ocfs2_super *osb = container_of(work, struct ocfs2_super,
 699                                               dquot_drop_work);
 700        struct llist_node *list;
 701        struct ocfs2_dquot *odquot, *next_odquot;
 702
 703        list = llist_del_all(&osb->dquot_drop_list);
 704        llist_for_each_entry_safe(odquot, next_odquot, list, list) {
 705                /* Drop the reference we acquired in ocfs2_dquot_release() */
 706                dqput(&odquot->dq_dquot);
 707        }
 708}
 709
 710/*
 711 * Called when the last reference to dquot is dropped. If we are called from
 712 * downconvert thread, we cannot do all the handling here because grabbing
 713 * quota lock could deadlock (the node holding the quota lock could need some
 714 * other cluster lock to proceed but with blocked downconvert thread we cannot
 715 * release any lock).
 716 */
 717static int ocfs2_release_dquot(struct dquot *dquot)
 718{
 719        handle_t *handle;
 720        struct ocfs2_mem_dqinfo *oinfo =
 721                        sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv;
 722        struct ocfs2_super *osb = OCFS2_SB(dquot->dq_sb);
 723        int status = 0;
 724
 725        trace_ocfs2_release_dquot(from_kqid(&init_user_ns, dquot->dq_id),
 726                                  dquot->dq_id.type);
 727
 728        mutex_lock(&dquot->dq_lock);
 729        /* Check whether we are not racing with some other dqget() */
 730        if (atomic_read(&dquot->dq_count) > 1)
 731                goto out;
 732        /* Running from downconvert thread? Postpone quota processing to wq */
 733        if (current == osb->dc_task) {
 734                /*
 735                 * Grab our own reference to dquot and queue it for delayed
 736                 * dropping.  Quota code rechecks after calling
 737                 * ->release_dquot() and won't free dquot structure.
 738                 */
 739                dqgrab(dquot);
 740                /* First entry on list -> queue work */
 741                if (llist_add(&OCFS2_DQUOT(dquot)->list, &osb->dquot_drop_list))
 742                        queue_work(osb->ocfs2_wq, &osb->dquot_drop_work);
 743                goto out;
 744        }
 745        status = ocfs2_lock_global_qf(oinfo, 1);
 746        if (status < 0)
 747                goto out;
 748        handle = ocfs2_start_trans(osb,
 749                ocfs2_calc_qdel_credits(dquot->dq_sb, dquot->dq_id.type));
 750        if (IS_ERR(handle)) {
 751                status = PTR_ERR(handle);
 752                mlog_errno(status);
 753                goto out_ilock;
 754        }
 755
 756        status = ocfs2_global_release_dquot(dquot);
 757        if (status < 0) {
 758                mlog_errno(status);
 759                goto out_trans;
 760        }
 761        status = ocfs2_local_release_dquot(handle, dquot);
 762        /*
 763         * If we fail here, we cannot do much as global structure is
 764         * already released. So just complain...
 765         */
 766        if (status < 0)
 767                mlog_errno(status);
 768        /*
 769         * Clear dq_off so that we search for the structure in quota file next
 770         * time we acquire it. The structure might be deleted and reallocated
 771         * elsewhere by another node while our dquot structure is on freelist.
 772         */
 773        dquot->dq_off = 0;
 774        clear_bit(DQ_ACTIVE_B, &dquot->dq_flags);
 775out_trans:
 776        ocfs2_commit_trans(osb, handle);
 777out_ilock:
 778        ocfs2_unlock_global_qf(oinfo, 1);
 779out:
 780        mutex_unlock(&dquot->dq_lock);
 781        if (status)
 782                mlog_errno(status);
 783        return status;
 784}
 785
 786/*
 787 * Read global dquot structure from disk or create it if it does
 788 * not exist. Also update use count of the global structure and
 789 * create structure in node-local quota file.
 790 */
 791static int ocfs2_acquire_dquot(struct dquot *dquot)
 792{
 793        int status = 0, err;
 794        int ex = 0;
 795        struct super_block *sb = dquot->dq_sb;
 796        struct ocfs2_super *osb = OCFS2_SB(sb);
 797        int type = dquot->dq_id.type;
 798        struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 799        struct inode *gqinode = info->dqi_gqinode;
 800        int need_alloc = ocfs2_global_qinit_alloc(sb, type);
 801        handle_t *handle;
 802
 803        trace_ocfs2_acquire_dquot(from_kqid(&init_user_ns, dquot->dq_id),
 804                                  type);
 805        mutex_lock(&dquot->dq_lock);
 806        /*
 807         * We need an exclusive lock, because we're going to update use count
 808         * and instantiate possibly new dquot structure
 809         */
 810        status = ocfs2_lock_global_qf(info, 1);
 811        if (status < 0)
 812                goto out;
 813        status = ocfs2_qinfo_lock(info, 0);
 814        if (status < 0)
 815                goto out_dq;
 816        /*
 817         * We always want to read dquot structure from disk because we don't
 818         * know what happened with it while it was on freelist.
 819         */
 820        status = qtree_read_dquot(&info->dqi_gi, dquot);
 821        ocfs2_qinfo_unlock(info, 0);
 822        if (status < 0)
 823                goto out_dq;
 824
 825        OCFS2_DQUOT(dquot)->dq_use_count++;
 826        OCFS2_DQUOT(dquot)->dq_origspace = dquot->dq_dqb.dqb_curspace;
 827        OCFS2_DQUOT(dquot)->dq_originodes = dquot->dq_dqb.dqb_curinodes;
 828        if (!dquot->dq_off) {   /* No real quota entry? */
 829                ex = 1;
 830                /*
 831                 * Add blocks to quota file before we start a transaction since
 832                 * locking allocators ranks above a transaction start
 833                 */
 834                WARN_ON(journal_current_handle());
 835                status = ocfs2_extend_no_holes(gqinode, NULL,
 836                        i_size_read(gqinode) + (need_alloc << sb->s_blocksize_bits),
 837                        i_size_read(gqinode));
 838                if (status < 0)
 839                        goto out_dq;
 840        }
 841
 842        handle = ocfs2_start_trans(osb,
 843                                   ocfs2_calc_global_qinit_credits(sb, type));
 844        if (IS_ERR(handle)) {
 845                status = PTR_ERR(handle);
 846                goto out_dq;
 847        }
 848        status = ocfs2_qinfo_lock(info, ex);
 849        if (status < 0)
 850                goto out_trans;
 851        status = qtree_write_dquot(&info->dqi_gi, dquot);
 852        if (ex && info_dirty(sb_dqinfo(sb, type))) {
 853                err = __ocfs2_global_write_info(sb, type);
 854                if (!status)
 855                        status = err;
 856        }
 857        ocfs2_qinfo_unlock(info, ex);
 858out_trans:
 859        ocfs2_commit_trans(osb, handle);
 860out_dq:
 861        ocfs2_unlock_global_qf(info, 1);
 862        if (status < 0)
 863                goto out;
 864
 865        status = ocfs2_create_local_dquot(dquot);
 866        if (status < 0)
 867                goto out;
 868        set_bit(DQ_ACTIVE_B, &dquot->dq_flags);
 869out:
 870        mutex_unlock(&dquot->dq_lock);
 871        if (status)
 872                mlog_errno(status);
 873        return status;
 874}
 875
 876static int ocfs2_get_next_id(struct super_block *sb, struct kqid *qid)
 877{
 878        int type = qid->type;
 879        struct ocfs2_mem_dqinfo *info = sb_dqinfo(sb, type)->dqi_priv;
 880        int status = 0;
 881
 882        trace_ocfs2_get_next_id(from_kqid(&init_user_ns, *qid), type);
 883        if (!sb_has_quota_loaded(sb, type)) {
 884                status = -ESRCH;
 885                goto out;
 886        }
 887        status = ocfs2_lock_global_qf(info, 0);
 888        if (status < 0)
 889                goto out;
 890        status = ocfs2_qinfo_lock(info, 0);
 891        if (status < 0)
 892                goto out_global;
 893        status = qtree_get_next_id(&info->dqi_gi, qid);
 894        ocfs2_qinfo_unlock(info, 0);
 895out_global:
 896        ocfs2_unlock_global_qf(info, 0);
 897out:
 898        /*
 899         * Avoid logging ENOENT since it just means there isn't next ID and
 900         * ESRCH which means quota isn't enabled for the filesystem.
 901         */
 902        if (status && status != -ENOENT && status != -ESRCH)
 903                mlog_errno(status);
 904        return status;
 905}
 906
 907static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
 908{
 909        unsigned long mask = (1 << (DQ_LASTSET_B + QIF_ILIMITS_B)) |
 910                             (1 << (DQ_LASTSET_B + QIF_BLIMITS_B)) |
 911                             (1 << (DQ_LASTSET_B + QIF_INODES_B)) |
 912                             (1 << (DQ_LASTSET_B + QIF_SPACE_B)) |
 913                             (1 << (DQ_LASTSET_B + QIF_BTIME_B)) |
 914                             (1 << (DQ_LASTSET_B + QIF_ITIME_B));
 915        int sync = 0;
 916        int status;
 917        struct super_block *sb = dquot->dq_sb;
 918        int type = dquot->dq_id.type;
 919        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 920        handle_t *handle;
 921        struct ocfs2_super *osb = OCFS2_SB(sb);
 922
 923        trace_ocfs2_mark_dquot_dirty(from_kqid(&init_user_ns, dquot->dq_id),
 924                                     type);
 925
 926        /* In case user set some limits, sync dquot immediately to global
 927         * quota file so that information propagates quicker */
 928        spin_lock(&dquot->dq_dqb_lock);
 929        if (dquot->dq_flags & mask)
 930                sync = 1;
 931        spin_unlock(&dquot->dq_dqb_lock);
 932        /* This is a slight hack but we can't afford getting global quota
 933         * lock if we already have a transaction started. */
 934        if (!sync || journal_current_handle()) {
 935                status = ocfs2_write_dquot(dquot);
 936                goto out;
 937        }
 938        status = ocfs2_lock_global_qf(oinfo, 1);
 939        if (status < 0)
 940                goto out;
 941        handle = ocfs2_start_trans(osb, OCFS2_QSYNC_CREDITS);
 942        if (IS_ERR(handle)) {
 943                status = PTR_ERR(handle);
 944                mlog_errno(status);
 945                goto out_ilock;
 946        }
 947        down_write(&sb_dqopt(sb)->dqio_sem);
 948        status = ocfs2_sync_dquot(dquot);
 949        if (status < 0) {
 950                mlog_errno(status);
 951                goto out_dlock;
 952        }
 953        /* Now write updated local dquot structure */
 954        status = ocfs2_local_write_dquot(dquot);
 955out_dlock:
 956        up_write(&sb_dqopt(sb)->dqio_sem);
 957        ocfs2_commit_trans(osb, handle);
 958out_ilock:
 959        ocfs2_unlock_global_qf(oinfo, 1);
 960out:
 961        if (status)
 962                mlog_errno(status);
 963        return status;
 964}
 965
 966/* This should happen only after set_dqinfo(). */
 967static int ocfs2_write_info(struct super_block *sb, int type)
 968{
 969        handle_t *handle;
 970        int status = 0;
 971        struct ocfs2_mem_dqinfo *oinfo = sb_dqinfo(sb, type)->dqi_priv;
 972
 973        status = ocfs2_lock_global_qf(oinfo, 1);
 974        if (status < 0)
 975                goto out;
 976        handle = ocfs2_start_trans(OCFS2_SB(sb), OCFS2_QINFO_WRITE_CREDITS);
 977        if (IS_ERR(handle)) {
 978                status = PTR_ERR(handle);
 979                mlog_errno(status);
 980                goto out_ilock;
 981        }
 982        status = dquot_commit_info(sb, type);
 983        ocfs2_commit_trans(OCFS2_SB(sb), handle);
 984out_ilock:
 985        ocfs2_unlock_global_qf(oinfo, 1);
 986out:
 987        if (status)
 988                mlog_errno(status);
 989        return status;
 990}
 991
 992static struct dquot *ocfs2_alloc_dquot(struct super_block *sb, int type)
 993{
 994        struct ocfs2_dquot *dquot =
 995                                kmem_cache_zalloc(ocfs2_dquot_cachep, GFP_NOFS);
 996
 997        if (!dquot)
 998                return NULL;
 999        return &dquot->dq_dquot;
1000}
1001
1002static void ocfs2_destroy_dquot(struct dquot *dquot)
1003{
1004        kmem_cache_free(ocfs2_dquot_cachep, dquot);
1005}
1006
1007const struct dquot_operations ocfs2_quota_operations = {
1008        /* We never make dquot dirty so .write_dquot is never called */
1009        .acquire_dquot  = ocfs2_acquire_dquot,
1010        .release_dquot  = ocfs2_release_dquot,
1011        .mark_dirty     = ocfs2_mark_dquot_dirty,
1012        .write_info     = ocfs2_write_info,
1013        .alloc_dquot    = ocfs2_alloc_dquot,
1014        .destroy_dquot  = ocfs2_destroy_dquot,
1015        .get_next_id    = ocfs2_get_next_id,
1016};
1017