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-rw-r--r--pathfs_frontend/compat_linux.go18
1 files changed, 18 insertions, 0 deletions
diff --git a/pathfs_frontend/compat_linux.go b/pathfs_frontend/compat_linux.go
new file mode 100644
index 0000000..7ed3c74
--- /dev/null
+++ b/pathfs_frontend/compat_linux.go
@@ -0,0 +1,18 @@
+package pathfs_frontend
+
+import "syscall"
+
+// prealloc - preallocate space without changing the file size. This prevents
+// us from running out of space in the middle of an operation.
+func prealloc(fd int, off int64, len int64) (err error) {
+ for {
+ err = syscall.Fallocate(fd, FALLOC_FL_KEEP_SIZE, off, len)
+ if err == syscall.EINTR {
+ // fallocate, like many syscalls, can return EINTR. This is not an
+ // error and just signifies that the operation was interrupted by a
+ // signal and we should try again.
+ continue
+ }
+ return err
+ }
+}