diff options
Diffstat (limited to 'internal/syscallcompat/sys_linux.go')
| -rw-r--r-- | internal/syscallcompat/sys_linux.go | 19 |
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) +} |