1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * quota.c - NTFS kernel quota ($Quota) handling. Part of the Linux-NTFS
4 * project.
5 *
6 * Copyright (c) 2004 Anton Altaparmakov
7 */
8
9#ifdef NTFS_RW
10
11#include "index.h"
12#include "quota.h"
13#include "debug.h"
14#include "ntfs.h"
15
16/**
17 * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
18 * @vol: ntfs volume on which to mark the quotas out of date
19 *
20 * Mark the quotas out of date on the ntfs volume @vol and return 'true' on
21 * success and 'false' on error.
22 */
23bool ntfs_mark_quotas_out_of_date(ntfs_volume *vol)
24{
25 ntfs_index_context *ictx;
26 QUOTA_CONTROL_ENTRY *qce;
27 const le32 qid = QUOTA_DEFAULTS_ID;
28 int err;
29
30 ntfs_debug("Entering.");
31 if (NVolQuotaOutOfDate(vol))
32 goto done;
33 if (!vol->quota_ino || !vol->quota_q_ino) {
34 ntfs_error(vol->sb, "Quota inodes are not open.");
35 return false;
36 }
37 inode_lock(inode: vol->quota_q_ino);
38 ictx = ntfs_index_ctx_get(idx_ni: NTFS_I(inode: vol->quota_q_ino));
39 if (!ictx) {
40 ntfs_error(vol->sb, "Failed to get index context.");
41 goto err_out;
42 }
43 err = ntfs_index_lookup(key: &qid, key_len: sizeof(qid), ictx);
44 if (err) {
45 if (err == -ENOENT)
46 ntfs_error(vol->sb, "Quota defaults entry is not "
47 "present.");
48 else
49 ntfs_error(vol->sb, "Lookup of quota defaults entry "
50 "failed.");
51 goto err_out;
52 }
53 if (ictx->data_len < offsetof(QUOTA_CONTROL_ENTRY, sid)) {
54 ntfs_error(vol->sb, "Quota defaults entry size is invalid. "
55 "Run chkdsk.");
56 goto err_out;
57 }
58 qce = (QUOTA_CONTROL_ENTRY*)ictx->data;
59 if (le32_to_cpu(qce->version) != QUOTA_VERSION) {
60 ntfs_error(vol->sb, "Quota defaults entry version 0x%x is not "
61 "supported.", le32_to_cpu(qce->version));
62 goto err_out;
63 }
64 ntfs_debug("Quota defaults flags = 0x%x.", le32_to_cpu(qce->flags));
65 /* If quotas are already marked out of date, no need to do anything. */
66 if (qce->flags & QUOTA_FLAG_OUT_OF_DATE)
67 goto set_done;
68 /*
69 * If quota tracking is neither requested, nor enabled and there are no
70 * pending deletes, no need to mark the quotas out of date.
71 */
72 if (!(qce->flags & (QUOTA_FLAG_TRACKING_ENABLED |
73 QUOTA_FLAG_TRACKING_REQUESTED |
74 QUOTA_FLAG_PENDING_DELETES)))
75 goto set_done;
76 /*
77 * Set the QUOTA_FLAG_OUT_OF_DATE bit thus marking quotas out of date.
78 * This is verified on WinXP to be sufficient to cause windows to
79 * rescan the volume on boot and update all quota entries.
80 */
81 qce->flags |= QUOTA_FLAG_OUT_OF_DATE;
82 /* Ensure the modified flags are written to disk. */
83 ntfs_index_entry_flush_dcache_page(ictx);
84 ntfs_index_entry_mark_dirty(ictx);
85set_done:
86 ntfs_index_ctx_put(ictx);
87 inode_unlock(inode: vol->quota_q_ino);
88 /*
89 * We set the flag so we do not try to mark the quotas out of date
90 * again on remount.
91 */
92 NVolSetQuotaOutOfDate(vol);
93done:
94 ntfs_debug("Done.");
95 return true;
96err_out:
97 if (ictx)
98 ntfs_index_ctx_put(ictx);
99 inode_unlock(inode: vol->quota_q_ino);
100 return false;
101}
102
103#endif /* NTFS_RW */
104

source code of linux/fs/ntfs/quota.c