fs/ntfs/quota.c

   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  17  * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
  18  * @vol:        ntfs volume on which to mark the quotas out of date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  20  * Mark the quotas out of date on the ntfs volume @vol and return 'true' on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(vol->quota_q_ino);
  38         ictx = ntfs_index_ctx_get(NTFS_I(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(&qid, 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(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(vol->quota_q_ino);
 100         return false;
 101 }
 102
 103 #endif /* NTFS_RW */