quota.c

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/*
 * quota.c - NTFS kernel quota ($Quota) handling.  Part of the Linux-NTFS
 *       project.
 *
 * Copyright (c) 2004 Anton Altaparmakov
 *
 * This program/include file is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program/include file is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program (in the main directory of the Linux-NTFS
 * distribution in the file COPYING); if not, write to the Free Software
 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef NTFS_RW

#include "index.h"
#include "quota.h"
#include "debug.h"
#include "ntfs.h"

bool ntfs_mark_quotas_out_of_date(ntfs_volume *vol)
{
    ntfs_index_context *ictx;
    QUOTA_CONTROL_ENTRY *qce;
    const le32 qid = QUOTA_DEFAULTS_ID;
    int err;

    ntfs_debug("Entering.");
    if (NVolQuotaOutOfDate(vol))
        goto done;
    if (!vol->quota_ino || !vol->quota_q_ino) {
        ntfs_error(vol->sb, "Quota inodes are not open.");
        return false;
    }
    mutex_lock(&vol->quota_q_ino->i_mutex);
    ictx = ntfs_index_ctx_get(NTFS_I(vol->quota_q_ino));
    if (!ictx) {
        ntfs_error(vol->sb, "Failed to get index context.");
        goto err_out;
    }
    err = ntfs_index_lookup(&qid, sizeof(qid), ictx);
    if (err) {
        if (err == -ENOENT)
            ntfs_error(vol->sb, "Quota defaults entry is not "
                    "present.");
        else
            ntfs_error(vol->sb, "Lookup of quota defaults entry "
                    "failed.");
        goto err_out;
    }
    if (ictx->data_len < offsetof(QUOTA_CONTROL_ENTRY, sid)) {
        ntfs_error(vol->sb, "Quota defaults entry size is invalid.  "
                "Run chkdsk.");
        goto err_out;
    }
    qce = (QUOTA_CONTROL_ENTRY*)ictx->data;
    if (le32_to_cpu(qce->version) != QUOTA_VERSION) {
        ntfs_error(vol->sb, "Quota defaults entry version 0x%x is not "
                "supported.", le32_to_cpu(qce->version));
        goto err_out;
    }
    ntfs_debug("Quota defaults flags = 0x%x.", le32_to_cpu(qce->flags));
    /* If quotas are already marked out of date, no need to do anything. */
    if (qce->flags & QUOTA_FLAG_OUT_OF_DATE)
        goto set_done;
    /*
     * If quota tracking is neither requested, nor enabled and there are no
     * pending deletes, no need to mark the quotas out of date.
     */
    if (!(qce->flags & (QUOTA_FLAG_TRACKING_ENABLED |
            QUOTA_FLAG_TRACKING_REQUESTED |
            QUOTA_FLAG_PENDING_DELETES)))
        goto set_done;
    /*
     * Set the QUOTA_FLAG_OUT_OF_DATE bit thus marking quotas out of date.
     * This is verified on WinXP to be sufficient to cause windows to
     * rescan the volume on boot and update all quota entries.
     */
    qce->flags |= QUOTA_FLAG_OUT_OF_DATE;
    /* Ensure the modified flags are written to disk. */
    ntfs_index_entry_flush_dcache_page(ictx);
    ntfs_index_entry_mark_dirty(ictx);
set_done:
    ntfs_index_ctx_put(ictx);
    mutex_unlock(&vol->quota_q_ino->i_mutex);
    /*
     * We set the flag so we do not try to mark the quotas out of date
     * again on remount.
     */
    NVolSetQuotaOutOfDate(vol);
done:
    ntfs_debug("Done.");
    return true;
err_out:
    if (ictx)
        ntfs_index_ctx_put(ictx);
    mutex_unlock(&vol->quota_q_ino->i_mutex);
    return false;
}

#endif /* NTFS_RW */