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/mount_internal.h>
  36 #include <sys/vnode.h>
  37 #include <sys/vnode_internal.h>
  38 #include <sys/malloc.h>
  39 #include <sys/ubc.h>
  40 #include <sys/quota.h>
  41
  42 #include <sys/kdebug.h>
  43
  44 #include "hfs.h"
  45 #include "hfs_catalog.h"
  46 #include "hfs_cnode.h"
  47 #include "hfs_dbg.h"
  48 #include "hfs_mount.h"
  49 #include "hfs_quota.h"
  50 #include "hfs_endian.h"
  51
  52 #include "hfscommon/headers/BTreesInternal.h"
  53 #include "hfscommon/headers/FileMgrInternal.h"
  54
  55
  56
  57 void hfs_generate_volume_notifications(struct hfsmount *hfsmp)
  58 {
  59         fsid_t fsid;
  60         u_int32_t freeblks, state=999;
  61
  62         /* Do not generate low disk notifications for read-only volumes */
  63         if (hfsmp->hfs_flags & HFS_READ_ONLY) {
  64                 return;
  65         }
  66
  67         fsid.val[0] = hfsmp->hfs_raw_dev;
  68         fsid.val[1] = vfs_typenum(HFSTOVFS(hfsmp));
  69
  70         freeblks = hfs_freeblks(hfsmp, 1);
  71
  72         if (freeblks < hfsmp->hfs_freespace_notify_dangerlimit) {
  73                 state = 2;
  74         } else if (freeblks < hfsmp->hfs_freespace_notify_warninglimit) {
  75                 state = 1;
  76         } else if (freeblks >= hfsmp->hfs_freespace_notify_desiredlevel) {
  77                 state = 0;
  78         }
  79
  80         /* Free blocks are less than dangerlimit for the first time */
  81         if (state == 2 && !(hfsmp->hfs_notification_conditions & VQ_VERYLOWDISK)) {
  82                 /* Dump some logging to track down intermittent issues */
  83                 printf("hfs: set VeryLowDisk: vol:%s, freeblks:%d, dangerlimit:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_dangerlimit);
  84
  85 #if HFS_SPARSE_DEV
  86                 // If we're a sparse device, dump some info about the backing store..
  87                 hfs_lock_mount(hfsmp);
  88                 vnode_t backing_vp = hfsmp->hfs_backingfs_rootvp;
  89                 if (backing_vp && vnode_get(backing_vp) != 0)
  90                         backing_vp = NULL;
  91                 hfs_unlock_mount(hfsmp);
  92
  93                 if (backing_vp) {
  94                         struct mount *mp = vnode_mount(backing_vp);
  95                         printf("hfs: set VeryLowDisk: vol:%s, backingstore b_avail:%lld, tag:%d\n",
  96                                    hfsmp->vcbVN, mp->mnt_vfsstat.f_bavail, backing_vp->v_tag);
  97                         vnode_put(backing_vp);
  98                 }
  99 #endif
 100
 101                 hfsmp->hfs_notification_conditions |= (VQ_VERYLOWDISK|VQ_LOWDISK);
 102                 vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
 103         } else if (state == 1) {
 104                 /* Free blocks are less than warning limit for the first time */
 105                 if (!(hfsmp->hfs_notification_conditions & VQ_LOWDISK)) {
 106                         printf("hfs: set LowDisk: vol:%s, freeblks:%d, warninglimit:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_warninglimit);
 107                         hfsmp->hfs_notification_conditions |= VQ_LOWDISK;
 108                         vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
 109                 } else if (hfsmp->hfs_notification_conditions & VQ_VERYLOWDISK) {
 110                         /* Free blocks count has increased from danger limit to warning limit, so just clear VERYLOWDISK warning */
 111                         printf("hfs: clear VeryLowDisk: vol:%s, freeblks:%d, dangerlimit:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_dangerlimit);
 112                         hfsmp->hfs_notification_conditions &= ~VQ_VERYLOWDISK;
 113                         vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
 114                 }
 115         } else if (state == 0) {
 116                 /* Free blocks count has increased to desirable level, so clear all conditions */
 117                 if (hfsmp->hfs_notification_conditions & (VQ_LOWDISK|VQ_VERYLOWDISK)) {
 118                         if (hfsmp->hfs_notification_conditions & VQ_LOWDISK) {
 119                                 printf("hfs: clear LowDisk: vol:%s, freeblks:%d, warninglimit:%d, desiredlevel:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_warninglimit, hfsmp->hfs_freespace_notify_desiredlevel);
 120                         }
 121                         if (hfsmp->hfs_notification_conditions & VQ_VERYLOWDISK) {
 122                                 printf("hfs: clear VeryLowDisk: vol:%s, freeblks:%d, dangerlimit:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_warninglimit);
 123                         }
 124                         hfsmp->hfs_notification_conditions &= ~(VQ_VERYLOWDISK|VQ_LOWDISK);
 125                         if (hfsmp->hfs_notification_conditions == 0) {
 126                                 vfs_event_signal(&fsid, VQ_UPDATE, (intptr_t)NULL);
 127                         } else {
 128                                 vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
 129                         }
 130                 }
 131         }
 132 }