Root/fs/ntfs/quota.c

1/*
2 * quota.c - NTFS kernel quota ($Quota) handling. Part of the Linux-NTFS
3 * project.
4 *
5 * Copyright (c) 2004 Anton Altaparmakov
6 *
7 * This program/include file is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as published
9 * by the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program/include file is distributed in the hope that it will be
13 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program (in the main directory of the Linux-NTFS
19 * distribution in the file COPYING); if not, write to the Free Software
20 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#ifdef NTFS_RW
24
25#include "index.h"
26#include "quota.h"
27#include "debug.h"
28#include "ntfs.h"
29
30/**
31 * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
32 * @vol: ntfs volume on which to mark the quotas out of date
33 *
34 * Mark the quotas out of date on the ntfs volume @vol and return 'true' on
35 * success and 'false' on error.
36 */
37bool ntfs_mark_quotas_out_of_date(ntfs_volume *vol)
38{
39    ntfs_index_context *ictx;
40    QUOTA_CONTROL_ENTRY *qce;
41    const le32 qid = QUOTA_DEFAULTS_ID;
42    int err;
43
44    ntfs_debug("Entering.");
45    if (NVolQuotaOutOfDate(vol))
46        goto done;
47    if (!vol->quota_ino || !vol->quota_q_ino) {
48        ntfs_error(vol->sb, "Quota inodes are not open.");
49        return false;
50    }
51    mutex_lock(&vol->quota_q_ino->i_mutex);
52    ictx = ntfs_index_ctx_get(NTFS_I(vol->quota_q_ino));
53    if (!ictx) {
54        ntfs_error(vol->sb, "Failed to get index context.");
55        goto err_out;
56    }
57    err = ntfs_index_lookup(&qid, sizeof(qid), ictx);
58    if (err) {
59        if (err == -ENOENT)
60            ntfs_error(vol->sb, "Quota defaults entry is not "
61                    "present.");
62        else
63            ntfs_error(vol->sb, "Lookup of quota defaults entry "
64                    "failed.");
65        goto err_out;
66    }
67    if (ictx->data_len < offsetof(QUOTA_CONTROL_ENTRY, sid)) {
68        ntfs_error(vol->sb, "Quota defaults entry size is invalid. "
69                "Run chkdsk.");
70        goto err_out;
71    }
72    qce = (QUOTA_CONTROL_ENTRY*)ictx->data;
73    if (le32_to_cpu(qce->version) != QUOTA_VERSION) {
74        ntfs_error(vol->sb, "Quota defaults entry version 0x%x is not "
75                "supported.", le32_to_cpu(qce->version));
76        goto err_out;
77    }
78    ntfs_debug("Quota defaults flags = 0x%x.", le32_to_cpu(qce->flags));
79    /* If quotas are already marked out of date, no need to do anything. */
80    if (qce->flags & QUOTA_FLAG_OUT_OF_DATE)
81        goto set_done;
82    /*
83     * If quota tracking is neither requested, nor enabled and there are no
84     * pending deletes, no need to mark the quotas out of date.
85     */
86    if (!(qce->flags & (QUOTA_FLAG_TRACKING_ENABLED |
87            QUOTA_FLAG_TRACKING_REQUESTED |
88            QUOTA_FLAG_PENDING_DELETES)))
89        goto set_done;
90    /*
91     * Set the QUOTA_FLAG_OUT_OF_DATE bit thus marking quotas out of date.
92     * This is verified on WinXP to be sufficient to cause windows to
93     * rescan the volume on boot and update all quota entries.
94     */
95    qce->flags |= QUOTA_FLAG_OUT_OF_DATE;
96    /* Ensure the modified flags are written to disk. */
97    ntfs_index_entry_flush_dcache_page(ictx);
98    ntfs_index_entry_mark_dirty(ictx);
99set_done:
100    ntfs_index_ctx_put(ictx);
101    mutex_unlock(&vol->quota_q_ino->i_mutex);
102    /*
103     * We set the flag so we do not try to mark the quotas out of date
104     * again on remount.
105     */
106    NVolSetQuotaOutOfDate(vol);
107done:
108    ntfs_debug("Done.");
109    return true;
110err_out:
111    if (ictx)
112        ntfs_index_ctx_put(ictx);
113    mutex_unlock(&vol->quota_q_ino->i_mutex);
114    return false;
115}
116
117#endif /* NTFS_RW */
118

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