diff options
Diffstat (limited to 'src/internal/poll/copy_file_range_linux.go')
| -rw-r--r-- | src/internal/poll/copy_file_range_linux.go | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/internal/poll/copy_file_range_linux.go b/src/internal/poll/copy_file_range_linux.go index fc34aef4cb..01b242a4ea 100644 --- a/src/internal/poll/copy_file_range_linux.go +++ b/src/internal/poll/copy_file_range_linux.go @@ -112,7 +112,15 @@ func CopyFileRange(dst, src *FD, remain int64) (written int64, handled bool, err return 0, false, nil case nil: if n == 0 { - // src is at EOF, which means we are done. + // If we did not read any bytes at all, + // then this file may be in a file system + // where copy_file_range silently fails. + // https://lore.kernel.org/linux-fsdevel/20210126233840.GG4626@dread.disaster.area/T/#m05753578c7f7882f6e9ffe01f981bc223edef2b0 + if written == 0 { + return 0, false, nil + } + // Otherwise src is at EOF, which means + // we are done. return written, true, nil } remain -= n |