X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/2d21ac55c334faf3a56e5634905ed6987fc787d4..fe8ab488e9161c46dd9885d58fc52996dc0249ff:/bsd/hfs/hfs_notification.c

diff --git a/bsd/hfs/hfs_notification.c b/bsd/hfs/hfs_notification.c
index 5ea5825a6..621c58de5 100644
--- a/bsd/hfs/hfs_notification.c
+++ b/bsd/hfs/hfs_notification.c
@@ -32,7 +32,9 @@
 #include <sys/dirent.h>
 #include <sys/stat.h>
 #include <sys/mount.h>
+#include <sys/mount_internal.h>
 #include <sys/vnode.h>
+#include <sys/vnode_internal.h>
 #include <sys/malloc.h>
 #include <sys/ubc.h>
 #include <sys/quota.h>
@@ -55,21 +57,76 @@
 void hfs_generate_volume_notifications(struct hfsmount *hfsmp) 
 {
 	fsid_t fsid;
-		
-	fsid.val[0] = (long)hfsmp->hfs_raw_dev;
-	fsid.val[1] = (long)vfs_typenum(HFSTOVFS(hfsmp));
+	u_int32_t freeblks, state=999;
+
+	/* 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));
 	
-	if (hfsmp->hfs_notification_conditions & VQ_LOWDISK) {
-		/* Check to see whether the free space is back above the minimal level: */
-		if (hfs_freeblks(hfsmp, 1) > hfsmp->hfs_freespace_notify_desiredlevel) {
-            hfsmp->hfs_notification_conditions &= ~VQ_LOWDISK;
-            vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
+	freeblks = hfs_freeblks(hfsmp, 1);
+
+	if (freeblks < hfsmp->hfs_freespace_notify_dangerlimit) {
+		state = 2;
+	} else if (freeblks < hfsmp->hfs_freespace_notify_warninglimit) {
+		state = 1;
+	} else if (freeblks >= hfsmp->hfs_freespace_notify_desiredlevel) {
+		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: set VeryLowDisk: vol:%s, freeblks:%d, dangerlimit:%d\n", hfsmp->vcbVN, freeblks, hfsmp->hfs_freespace_notify_dangerlimit);
+
+#if HFS_SPARSE_DEV
+		// 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: 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 {
-		/* Check to see whether the free space fell below the requested limit: */
-		if (hfs_freeblks(hfsmp, 1) < hfsmp->hfs_freespace_notify_warninglimit) {
-            hfsmp->hfs_notification_conditions |= VQ_LOWDISK;
-            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);
+			} else {
+				vfs_event_signal(&fsid, hfsmp->hfs_notification_conditions, (intptr_t)NULL);
+			}
 		}
-	};
+	}
 }