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fs: lock mounts while snapshotting.
fs: lock mounts while snapshotting, skip clean trees

--- a/fs.c

+++ b/fs.c

@@ -2352,7 +2352,10 @@

 		chsend(fs->admchan, a);

 		tmnow(&now, nil);

+		lock(&fs->mountlk);

 		for(mnt = fs->mounts; mnt != nil; mnt = mnt->next){

+			if(!mnt->root->dirty)

+				continue;

 			if(now.yday != then.yday){

 				snprint(buf, sizeof(buf),

 					"%s@day.%τ", mnt->name, tmfmt(&now, "YYYY.MM.DD[_]hh:mm:ss"));

@@ -2373,6 +2376,7 @@

 				snapmsg("main", mnt->minutely[m], Lauto);

 			}

 		}

+		unlock(&fs->mountlk);

 		if(now.hour != then.hour)

 			h = (h+1)%24;

 		if(now.min != then.min)