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https://github.com/VictoriaMetrics/VictoriaMetrics.git
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d962568e93
This will simplify examining the returned errors such as httpserver.ErrorWithStatusCode . See https://blog.golang.org/go1.13-errors for details.
40 lines
996 B
Go
40 lines
996 B
Go
package filestream
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import (
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"fmt"
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"golang.org/x/sys/unix"
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)
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func (st *streamTracker) adviseDontNeed(n int, fdatasync bool) error {
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st.length += uint64(n)
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if st.fd == 0 {
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return nil
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}
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if st.length < dontNeedBlockSize {
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return nil
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}
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blockSize := st.length - (st.length % dontNeedBlockSize)
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if fdatasync {
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if err := unix.Fdatasync(int(st.fd)); err != nil {
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return fmt.Errorf("unix.Fdatasync error: %w", err)
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}
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}
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if err := unix.Fadvise(int(st.fd), int64(st.offset), int64(blockSize), unix.FADV_DONTNEED); err != nil {
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return fmt.Errorf("unix.Fadvise(FADV_DONTNEEDED, %d, %d) error: %w", st.offset, blockSize, err)
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}
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st.offset += blockSize
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st.length -= blockSize
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return nil
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}
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func (st *streamTracker) close() error {
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if st.fd == 0 {
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return nil
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}
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// Advise the whole file as it shouldn't be cached.
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if err := unix.Fadvise(int(st.fd), 0, 0, unix.FADV_DONTNEED); err != nil {
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return fmt.Errorf("unix.Fadvise(FADV_DONTNEEDED, 0, 0) error: %w", err)
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}
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return nil
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}
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