xnu-2782.40.9.tar.gz

[apple/xnu.git] / bsd / hfs / hfs_notification.c

diff --git a/bsd/hfs/hfs_notification.c b/bsd/hfs/hfs_notification.c
index 227e744b2cb2fb028d9579eafb25ccf81463f1e4..621c58de56ccd501321d2498e98d8c1f3a95bcda 100644 (file)
--- a/bsd/hfs/hfs_notification.c
+++ b/bsd/hfs/hfs_notification.c
@@ -58,9 +58,14 @@ void hfs_generate_volume_notifications(struct hfsmount *hfsmp)
 {
        fsid_t fsid;
        u_int32_t freeblks, state=999;
-               
-       fsid.val[0] = (long)hfsmp->hfs_raw_dev;
-       fsid.val[1] = (long)vfs_typenum(HFSTOVFS(hfsmp));
+
+       /* Do not generate low disk notifications for read-only volumes */
+       if (hfsmp->hfs_flags & HFS_READ_ONLY) {
+               return;
+       }
+
+       fsid.val[0] = hfsmp->hfs_raw_dev;
+       fsid.val[1] = vfs_typenum(HFSTOVFS(hfsmp));
        
        freeblks = hfs_freeblks(hfsmp, 1);
 
@@ -72,33 +77,50 @@ void hfs_generate_volume_notifications(struct hfsmount *hfsmp)
                state = 0;
        }
 
+       /* Free blocks are less than dangerlimit for the first time */
        if (state == 2 && !(hfsmp->hfs_notification_conditions & VQ_VERYLOWDISK)) {
                /* Dump some logging to track down intermittent issues */
-               printf("HFS: Very Low Disk: freeblks: %d, dangerlimit: %d\n", freeblks, hfsmp->hfs_freespace_notify_dangerlimit);
+               printf("hfs: set VeryLowDisk: vol:%s, freeblks:%d, dangerlimit:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_dangerlimit);
+
 #if HFS_SPARSE_DEV
-               if (hfsmp->hfs_flags & HFS_HAS_SPARSE_DEVICE) {
-                       if (hfsmp->hfs_backingfs_rootvp) {
-                               struct mount *mp = vnode_mount (hfsmp->hfs_backingfs_rootvp);
-                               /* If we're a sparse device, dump some info about the backing store... */
-                               if (mp) {
-                                       printf("HFS: Very Low Disk: backingstore b_avail %lld, tag %d\n", mp->mnt_vfsstat.f_bavail, hfsmp->hfs_backingfs_rootvp->v_tag);
-                               }
-                       }
+               // If we're a sparse device, dump some info about the backing store..
+               hfs_lock_mount(hfsmp);
+               vnode_t backing_vp = hfsmp->hfs_backingfs_rootvp;
+               if (backing_vp && vnode_get(backing_vp) != 0)
+                       backing_vp = NULL;
+               hfs_unlock_mount(hfsmp);
+
+               if (backing_vp) {
+                       struct mount *mp = vnode_mount(backing_vp);
+                       printf("hfs: set VeryLowDisk: vol:%s, backingstore b_avail:%lld, tag:%d\n", 
+                                  hfsmp->vcbVN, mp->mnt_vfsstat.f_bavail, backing_vp->v_tag);
+                       vnode_put(backing_vp);
                }
 #endif
+
                hfsmp->hfs_notification_conditions |= (VQ_VERYLOWDISK|VQ_LOWDISK);
                vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
        } else if (state == 1) {
+               /* Free blocks are less than warning limit for the first time */
                if (!(hfsmp->hfs_notification_conditions & VQ_LOWDISK)) {
-                       printf("HFS: Low Disk: freeblks: %d, warninglimit: %d\n", freeblks, hfsmp->hfs_freespace_notify_warninglimit);
+                       printf("hfs: set LowDisk: vol:%s, freeblks:%d, warninglimit:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_warninglimit);
                        hfsmp->hfs_notification_conditions |= VQ_LOWDISK;
                        vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
                } else if (hfsmp->hfs_notification_conditions & VQ_VERYLOWDISK) {
+                       /* Free blocks count has increased from danger limit to warning limit, so just clear VERYLOWDISK warning */
+                       printf("hfs: clear VeryLowDisk: vol:%s, freeblks:%d, dangerlimit:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_dangerlimit);
                        hfsmp->hfs_notification_conditions &= ~VQ_VERYLOWDISK;
                        vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
                }
        } else if (state == 0) {
+               /* Free blocks count has increased to desirable level, so clear all conditions */
                if (hfsmp->hfs_notification_conditions & (VQ_LOWDISK|VQ_VERYLOWDISK)) {
+                       if (hfsmp->hfs_notification_conditions & VQ_LOWDISK) {
+                               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);
+                       }
+                       if (hfsmp->hfs_notification_conditions & VQ_VERYLOWDISK) {
+                               printf("hfs: clear VeryLowDisk: vol:%s, freeblks:%d, dangerlimit:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_warninglimit);
+                       } 
                        hfsmp->hfs_notification_conditions &= ~(VQ_VERYLOWDISK|VQ_LOWDISK);
                        if (hfsmp->hfs_notification_conditions == 0) {
                                vfs_event_signal(&fsid, VQ_UPDATE, (intptr_t)NULL);