aboutsummaryrefslogtreecommitdiff
path: root/internal/syscallcompat/sys_linux.go
diff options
context:
space:
mode:
Diffstat (limited to 'internal/syscallcompat/sys_linux.go')
-rw-r--r--internal/syscallcompat/sys_linux.go19
1 files changed, 14 insertions, 5 deletions
diff --git a/internal/syscallcompat/sys_linux.go b/internal/syscallcompat/sys_linux.go
index 9fe9da5..ca6df95 100644
--- a/internal/syscallcompat/sys_linux.go
+++ b/internal/syscallcompat/sys_linux.go
@@ -11,9 +11,10 @@ const FALLOC_FL_KEEP_SIZE = 0x01
var preallocWarn sync.Once
-// 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) {
+// EnospcPrealloc preallocates ciphertext space without changing the file
+// size. This guarantees that we don't run out of space while writing a
+// ciphertext block (that would corrupt the block).
+func EnospcPrealloc(fd int, off int64, len int64) (err error) {
for {
err = syscall.Fallocate(fd, FALLOC_FL_KEEP_SIZE, off, len)
if err == syscall.EINTR {
@@ -23,8 +24,8 @@ func Prealloc(fd int, off int64, len int64) (err error) {
continue
}
if err == syscall.EOPNOTSUPP {
- // ZFS does not support fallocate which caused gocryptfs to abort
- // every write operation: https://github.com/rfjakob/gocryptfs/issues/22
+ // ZFS and ext3 do not support fallocate. Warn but continue anyway.
+ // https://github.com/rfjakob/gocryptfs/issues/22
preallocWarn.Do(func() {
tlog.Warn.Printf("Warning: The underlying filesystem " +
"does not support fallocate(2). gocryptfs will continue working " +
@@ -35,3 +36,11 @@ func Prealloc(fd int, off int64, len int64) (err error) {
return err
}
}
+
+func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) {
+ return syscall.Openat(dirfd, path, flags, mode)
+}
+
+func Fallocate(fd int, mode uint32, off int64, len int64) (err error) {
+ return syscall.Fallocate(fd, mode, off, len)
+}