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Linux/fs/ntfs/quota.c

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  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 31  * ntfs_mark_quotas_out_of_date - mark the quotas out of date on an ntfs volume
 32  * @vol:        ntfs volume on which to mark the quotas out of date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 34  * Mark the quotas out of date on the ntfs volume @vol and return 'true' on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  */
 37 bool 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         inode_lock(vol->quota_q_ino);
 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);
 99 set_done:
100         ntfs_index_ctx_put(ictx);
101         inode_unlock(vol->quota_q_ino);
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);
107 done:
108         ntfs_debug("Done.");
109         return true;
110 err_out:
111         if (ictx)
112                 ntfs_index_ctx_put(ictx);
113         inode_unlock(vol->quota_q_ino);
114         return false;
115 }
116 
117 #endif /* NTFS_RW */
118 

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