fix: remove unusued PerfInfoHandler code (#9328)

- Removes PerfInfo admin API as its not OBDInfo
- Keep the drive path without the metaBucket in OBD
  global latency map.
- Remove all the unused code related to PerfInfo API
- Do not redefined global mib,gib constants use
  humanize.MiByte and humanize.GiByte instead always

pkg/disk/disk.go

@@ -16,10 +16,6 @@
 
 package disk
 
-import (
-	"os"
-)
-
 // Info stat fs struct is container which holds following values
 // Total - total size of the volume / disk
 // Free - free size of the volume / disk
@@ -36,60 +32,3 @@ type Info struct {
 	// Usage is calculated per tenant.
 	Usage uint64
 }
-
-// Performance holds informantion about read and write speed of a disk
-type Performance struct {
-	Path       string  `json:"path"`
-	Error      string  `json:"error,omitempty"`
-	WriteSpeed float64 `json:"writeSpeed"`
-	ReadSpeed  float64 `json:"readSpeed"`
-}
-
-// GetPerformance returns given disk's read and write performance
-func GetPerformance(path string, size int64) Performance {
-	perf := Performance{}
-	write, read, err := doPerfMeasure(path, size)
-	if err != nil {
-		perf.Error = err.Error()
-		return perf
-	}
-	perf.WriteSpeed = write
-	perf.ReadSpeed = read
-	return perf
-}
-
-// Calculate the write and read performance - write and read 10 tmp (1 MiB)
-// files and find the average time taken (Bytes / Sec)
-func doPerfMeasure(fsPath string, size int64) (writeSpeed, readSpeed float64, err error) {
-	// Remove the file created for speed test purposes
-	defer os.RemoveAll(fsPath)
-
-	// Create a file with O_DIRECT flag
-	w, err := OpenFileDirectIO(fsPath, os.O_CREATE|os.O_WRONLY|os.O_EXCL, 0666)
-	if err != nil {
-		return 0, 0, err
-	}
-
-	// Fetch aligned buf for direct-io
-	buf := AlignedBlock(speedTestBlockSize)
-
-	writeSpeed, err = speedTestWrite(w, buf, size)
-	w.Close()
-	if err != nil {
-		return 0, 0, err
-	}
-
-	// Open file to compute read speed
-	r, err := OpenFileDirectIO(fsPath, os.O_RDONLY, 0666)
-	if err != nil {
-		return 0, 0, err
-	}
-	defer r.Close()
-
-	readSpeed, err = speedTestRead(r, buf, size)
-	if err != nil {
-		return 0, 0, err
-	}
-
-	return writeSpeed, readSpeed, nil
-}