75 lines
2.3 KiB
Go
75 lines
2.3 KiB
Go
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// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: MIT
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//go:build linux
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package nfsfs
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import (
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"os"
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"path/filepath"
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"testing"
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)
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func TestLocalSparse(t *testing.T) {
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root := t.TempDir()
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if err := os.WriteFile(filepath.Join(root, "s.bin"), make([]byte, 8192), 0o644); err != nil {
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t.Fatal(err)
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}
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l, err := NewLocal(root)
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if err != nil {
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t.Fatal(err)
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}
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rootHandle, err := l.Root()
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if err != nil {
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t.Fatal(err)
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}
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fh, _, err := l.Lookup(rootHandle, "s.bin")
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if err != nil {
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t.Fatal(err)
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}
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// The file is all data: the only hole is the virtual one every file
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// carries at its end, so the seek answers the size with the eof flag,
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// RFC 7862 section 15.11.
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off, eof, err := l.SeekHole(fh, 0)
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if err != nil || off != 8192 || !eof {
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t.Fatalf("hole in a full file: %d %v %v", off, eof, err)
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}
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if off, eof, err := l.SeekData(fh, 0); err != nil || off != 0 || eof {
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t.Fatalf("seek data: %d %v %v", off, eof, err)
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}
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// A seek past the end is NXIO, not an answer.
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if _, _, err := l.SeekData(fh, 8193); err != ErrBeyondEOF {
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t.Fatalf("seek past the end: %v", err)
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}
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// Punching a hole moves the first hole to the punched offset.
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if err := l.Deallocate(fh, 4096, 4096); err != nil {
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t.Fatalf("deallocate: %v", err)
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}
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off, eof, err = l.SeekHole(fh, 0)
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if err != nil || off != 4096 || eof {
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t.Fatalf("seek hole: %d %v %v", off, eof, err)
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}
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// No data follows inside the hole: the answer names the size with
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// the eof flag.
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if off, eof, err := l.SeekData(fh, 4096); err != nil || off != 8192 || !eof {
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t.Fatalf("data in the hole: %d %v %v", off, eof, err)
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}
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// Allocate reserves the space without moving the hole back.
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if err := l.Allocate(fh, 4096, 4096); err != nil {
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t.Fatalf("allocate: %v", err)
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}
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if off, eof, err := l.SeekHole(fh, 0); err != nil || off != 4096 || eof {
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t.Fatalf("seek hole after allocate: %d %v %v", off, eof, err)
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}
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// Allocate past the end grows the file to the end of the reserved
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// range, which RFC 7862 section 15.1 requires.
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if err := l.Allocate(fh, 8192, 4096); err != nil {
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t.Fatalf("allocate past eof: %v", err)
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}
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info, err := l.Getattr(fh)
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if err != nil || info.Size != 12288 {
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t.Fatalf("size after the allocate past eof: %d, %v", info.Size, err)
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}
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}
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