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vfs: add --vfs-writeback option to delay writes back to cloud storage

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This is enabled by default and can be disabled with --vfs-writeback 0
This commit is contained in:
Nick Craig-Wood
2020-04-17 11:18:58 +01:00
parent 28255f1bac
commit e4e53a2e61
19 changed files with 958 additions and 385 deletions
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39
vfs/write_test.go
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@@ -17,21 +17,20 @@ import (
)
// Open a file for write
func writeHandleCreate(t *testing.T, r *fstest.Run) (*VFS, *WriteFileHandle) {
vfs := New(r.Fremote, nil)
func writeHandleCreate(t *testing.T) (r *fstest.Run, vfs *VFS, fh *WriteFileHandle, cleanup func()) {
r, vfs, cleanup = newTestVFS(t)
h, err := vfs.OpenFile("file1", os.O_WRONLY|os.O_CREATE, 0777)
require.NoError(t, err)
fh, ok := h.(*WriteFileHandle)
require.True(t, ok)
return vfs, fh
return r, vfs, fh, cleanup
}
func TestWriteFileHandleMethods(t *testing.T) {
r := fstest.NewRun(t)
defer r.Finalise()
vfs, fh := writeHandleCreate(t, r)
r, vfs, fh, cleanup := writeHandleCreate(t)
defer cleanup()
// String
assert.Equal(t, "file1 (w)", fh.String())
@@ -133,9 +132,8 @@ func TestWriteFileHandleMethods(t *testing.T) {
}
func TestWriteFileHandleWriteAt(t *testing.T) {
r := fstest.NewRun(t)
defer r.Finalise()
vfs, fh := writeHandleCreate(t, r)
r, vfs, fh, cleanup := writeHandleCreate(t)
defer cleanup()
// Preconditions
assert.Equal(t, int64(0), fh.offset)
@@ -179,9 +177,8 @@ func TestWriteFileHandleWriteAt(t *testing.T) {
}
func TestWriteFileHandleFlush(t *testing.T) {
r := fstest.NewRun(t)
defer r.Finalise()
vfs, fh := writeHandleCreate(t, r)
_, vfs, fh, cleanup := writeHandleCreate(t)
defer cleanup()
// Check Flush already creates file for unwritten handles, without closing it
err := fh.Flush()
@@ -213,9 +210,8 @@ func TestWriteFileHandleFlush(t *testing.T) {
}
func TestWriteFileHandleRelease(t *testing.T) {
r := fstest.NewRun(t)
defer r.Finalise()
_, fh := writeHandleCreate(t, r)
_, _, fh, cleanup := writeHandleCreate(t)
defer cleanup()
// Check Release closes file
err := fh.Release()
@@ -262,12 +258,12 @@ func canSetModTime(t *testing.T, r *fstest.Run) bool {
// tests mod time on open files
func TestWriteFileModTimeWithOpenWriters(t *testing.T) {
r := fstest.NewRun(t)
defer r.Finalise()
r, vfs, fh, cleanup := writeHandleCreate(t)
defer cleanup()
if !canSetModTime(t, r) {
return
t.Skip("can't set mod time")
}
vfs, fh := writeHandleCreate(t, r)
mtime := time.Date(2012, time.November, 18, 17, 32, 31, 0, time.UTC)
@@ -290,9 +286,8 @@ func TestWriteFileModTimeWithOpenWriters(t *testing.T) {
}
func testFileReadAt(t *testing.T, n int) {
r := fstest.NewRun(t)
defer r.Finalise()
vfs, fh := writeHandleCreate(t, r)
_, vfs, fh, cleanup := writeHandleCreate(t)
defer cleanup()
contents := []byte(random.String(n))
if n != 0 {