bsd/hfs/hfs_notification.c

   1 /*
   2  * Copyright (C) 2003, 2005 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #include <sys/systm.h>
  30 #include <sys/kernel.h>
  31 #include <sys/file.h>
  32 #include <sys/dirent.h>
  33 #include <sys/stat.h>
  34 #include <sys/mount.h>
  35 #include <sys/vnode.h>
  36 #include <sys/malloc.h>
  37 #include <sys/ubc.h>
  38 #include <sys/quota.h>
  39
  40 #include <sys/kdebug.h>
  41
  42 #include "hfs.h"
  43 #include "hfs_catalog.h"
  44 #include "hfs_cnode.h"
  45 #include "hfs_dbg.h"
  46 #include "hfs_mount.h"
  47 #include "hfs_quota.h"
  48 #include "hfs_endian.h"
  49
  50 #include "hfscommon/headers/BTreesInternal.h"
  51 #include "hfscommon/headers/FileMgrInternal.h"
  52
  53
  54
  55 void hfs_generate_volume_notifications(struct hfsmount *hfsmp)
  56 {
  57         fsid_t fsid;
  58         u_int32_t freeblks, state=999;
  59
  60         fsid.val[0] = (long)hfsmp->hfs_raw_dev;
  61         fsid.val[1] = (long)vfs_typenum(HFSTOVFS(hfsmp));
  62
  63         freeblks = hfs_freeblks(hfsmp, 1);
  64
  65         if (freeblks < hfsmp->hfs_freespace_notify_dangerlimit) {
  66                 state = 2;
  67         } else if (freeblks < hfsmp->hfs_freespace_notify_warninglimit) {
  68                 state = 1;
  69         } else if (freeblks >= hfsmp->hfs_freespace_notify_desiredlevel) {
  70                 state = 0;
  71         }
  72
  73         if (state == 2 && !(hfsmp->hfs_notification_conditions & VQ_VERYLOWDISK)) {
  74                 hfsmp->hfs_notification_conditions |= (VQ_VERYLOWDISK|VQ_LOWDISK);
  75                 vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
  76         } else if (state == 1) {
  77                 if (!(hfsmp->hfs_notification_conditions & VQ_LOWDISK)) {
  78                         hfsmp->hfs_notification_conditions |= VQ_LOWDISK;
  79                         vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
  80                 } else if (hfsmp->hfs_notification_conditions & VQ_VERYLOWDISK) {
  81                         hfsmp->hfs_notification_conditions &= ~VQ_VERYLOWDISK;
  82                         vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
  83                 }
  84         } else if (state == 0) {
  85                 if (hfsmp->hfs_notification_conditions & (VQ_LOWDISK|VQ_VERYLOWDISK)) {
  86                         hfsmp->hfs_notification_conditions &= ~(VQ_VERYLOWDISK|VQ_LOWDISK);
  87                         if (hfsmp->hfs_notification_conditions == 0) {
  88                                 vfs_event_signal(&fsid, VQ_UPDATE, (intptr_t)NULL);
  89                         } else {
  90                                 vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
  91                         }
  92                 }
  93         }
  94 }