Comments (1)
Optimized it, based on bufio.Reader
type DirectReader struct {
rd io.Reader
buf []byte
r, w int
err error
}
var errNegativeRead = errors.New("err negative read")
func (d *DirectReader) Read(p []byte) (n int, err error) {
n = len(p)
if n == 0 {
if d.Buffered() > 0 {
return 0, nil
}
return 0, d.readErr()
}
if d.r == d.w {
if d.err != nil {
return 0, d.readErr()
}
d.r = 0
d.w = 0
n, d.err = d.rd.Read(d.buf)
if n < 0 {
panic(errNegativeRead)
}
if n == 0 {
return 0, d.readErr()
}
d.w += n
}
n = copy(p, d.buf[d.r:d.w])
d.r += n
return n, nil
}
func (d *DirectReader) Buffered() int { return d.w - d.r }
func (d *DirectReader) readErr() error {
err := d.err
d.err = nil
return err
}
func NewDirectReader(r io.Reader, buf []byte) *DirectReader {
return &DirectReader{
rd: r,
buf: buf,
}
}
from directio.
Related Issues (11)
- confuse about the alignment HOT 6
- enable/disable O_DIRECT HOT 1
- buf size less than blockSize error report write err HOT 4
- Extremely slow O_DIRECT HOT 3
- Panic on 0 sized `AlignedBlock` HOT 2
- Alignment HOT 2
- windows dda to physical drive HOT 2
- Link to docs broken HOT 1
- TestDirectIO fail on Fedora 26, Go version 1.7 HOT 2
- OpenFile return error 'invalid argument' when path is under tmpfs HOT 1
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from directio.