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Levin Zimmermann
go-fuse
Commits
f47438ec
Commit
f47438ec
authored
May 26, 2012
by
Han-Wen Nienhuys
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Comment read.go.
parent
ebb11341
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fuse/read.go
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f47438ec
...
...
@@ -5,8 +5,18 @@ import (
"syscall"
)
// The result of Read is an array of bytes, but for performance
// reasons, we can also return data as a file-descriptor/offset/size
// tuple. If the backing store for the file system is another
// filesystem, this reduces the amount of copying and memory in use.
//
// If at any point, the raw data is needed, ReadResult.Read() will
// load the raw data.
type
ReadResult
struct
{
// Errno code for the read.
Status
// Raw bytes for the read.
Data
[]
byte
// If Data is nil and Status OK, splice from the following
...
...
@@ -15,6 +25,9 @@ type ReadResult struct {
// Offset within Fd, or -1 to use current offset.
FdOff
int64
// Size of data to be loaded. Actual data available may be
// less at the EOF.
FdSize
int
}
...
...
@@ -29,6 +42,8 @@ func (r *ReadResult) Size() int {
return
r
.
FdSize
}
// Reads raw bytes from file descriptor if necessary, using the passed
// buffer as storage.
func
(
r
*
ReadResult
)
Read
(
buf
[]
byte
)
Status
{
if
r
.
Data
!=
nil
||
!
r
.
Ok
()
{
return
r
.
Status
...
...
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