Updating server dependancies (#6712)

vendor/github.com/prometheus/procfs/sysfs/.gitignore

@@ -0,0 +1 @@
+fixtures/

vendor/github.com/prometheus/procfs/sysfs/fixtures/fs/xfs/sda1/stats/stats

@@ -1 +0,0 @@
-extent_alloc 1 0 0 0

vendor/github.com/prometheus/procfs/sysfs/fixtures/fs/xfs/sdb1/stats/stats

@@ -1 +0,0 @@
-extent_alloc 2 0 0 0

vendor/github.com/prometheus/procfs/sysfs/fs.go

@@ -18,6 +18,7 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/prometheus/procfs/bcache"
 	"github.com/prometheus/procfs/xfs"
 )
 
@@ -80,3 +81,28 @@ func (fs FS) XFSStats() ([]*xfs.Stats, error) {
 
 	return stats, nil
 }
+
+// BcacheStats retrieves bcache runtime statistics for each bcache.
+func (fs FS) BcacheStats() ([]*bcache.Stats, error) {
+	matches, err := filepath.Glob(fs.Path("fs/bcache/*-*"))
+	if err != nil {
+		return nil, err
+	}
+
+	stats := make([]*bcache.Stats, 0, len(matches))
+	for _, uuidPath := range matches {
+		// "*-*" in glob above indicates the name of the bcache.
+		name := filepath.Base(uuidPath)
+
+		// stats
+		s, err := bcache.GetStats(uuidPath)
+		if err != nil {
+			return nil, err
+		}
+
+		s.Name = name
+		stats = append(stats, s)
+	}
+
+	return stats, nil
+}

vendor/github.com/prometheus/procfs/sysfs/fs_test.go

@@ -64,3 +64,45 @@ func TestFSXFSStats(t *testing.T) {
 		}
 	}
 }
+
+func TestFSBcacheStats(t *testing.T) {
+	stats, err := FS("fixtures").BcacheStats()
+	if err != nil {
+		t.Fatalf("failed to parse bcache stats: %v", err)
+	}
+
+	tests := []struct {
+		name   string
+		bdevs  int
+		caches int
+	}{
+		{
+			name:   "deaddd54-c735-46d5-868e-f331c5fd7c74",
+			bdevs:  1,
+			caches: 1,
+		},
+	}
+
+	const expect = 1
+
+	if l := len(stats); l != expect {
+		t.Fatalf("unexpected number of bcache stats: %d", l)
+	}
+	if l := len(tests); l != expect {
+		t.Fatalf("unexpected number of tests: %d", l)
+	}
+
+	for i, tt := range tests {
+		if want, got := tt.name, stats[i].Name; want != got {
+			t.Errorf("unexpected stats name:\nwant: %q\nhave: %q", want, got)
+		}
+
+		if want, got := tt.bdevs, len(stats[i].Bdevs); want != got {
+			t.Errorf("unexpected value allocated:\nwant: %d\nhave: %d", want, got)
+		}
+
+		if want, got := tt.caches, len(stats[i].Caches); want != got {
+			t.Errorf("unexpected value allocated:\nwant: %d\nhave: %d", want, got)
+		}
+	}
+}