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pkg/fileutil: treat not support error as nil error in preallocate

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This commit is contained in:
Xiang Li 2015-08-20 11:02:56 -07:00
parent e1dfcec0ab
commit 3ca5482251
2 changed files with 20 additions and 1 deletions
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5
pkg/fileutil/perallocate_unsupported.go
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@ -18,6 +18,11 @@ package fileutil
import "os"
// Preallocate tries to allocate the space for given
// file. This operation is only supported on linux by a
// few filesystems (btrfs, ext4, etc.).
// If the operation is unsupported, no error will be returned.
// Otherwise, the error encountered will be returned.
func Preallocate(f *os.File, sizeInBytes int) error {
return nil
}

16
pkg/fileutil/preallocate.go
View File

@ -21,8 +21,22 @@ import (
"syscall"
)
// Preallocate tries to allocate the space for given
// file. This operation is only supported on linux by a
// few filesystems (btrfs, ext4, etc.).
// If the operation is unsupported, no error will be returned.
// Otherwise, the error encountered will be returned.
func Preallocate(f *os.File, sizeInBytes int) error {
// use mode = 1 to keep size
// see FALLOC_FL_KEEP_SIZE
return syscall.Fallocate(int(f.Fd()), 1, 0, int64(sizeInBytes))
err := syscall.Fallocate(int(f.Fd()), 1, 0, int64(sizeInBytes))
if err != nil {
errno, ok := err.(syscall.Errno)
// treat not support as nil error
if ok && errno == syscall.ENOTSUP {
return nil
}
return err
}
return nil
}