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17 | * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume |
18 | * @vol: ntfs volume on which to mark the quotas out of date |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20 | * Mark the quotas out of date on the ntfs volume @vol and return 'true' on |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 | */ |
23 | bool 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65 | /* If quotas are already marked out of date, no need to do anything.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70 | * pending deletes, no need to mark the quotas out of date.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); |
85 | set_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); |
93 | done: |
94 | ntfs_debug("Done." ); |
95 | return true; |
96 | err_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 | |