Hello everybody, I've just seen this message from 2006:
https://lists.gnu.org/archive/html/bug-cpio/2006-10/msg00002.html ============ Hello, I'm trying to use a block size larger (much larger) than 512 in copy-pass mode, and cpio --help says this should be possible: Operation modifiers valid in any mode: --block-size=BLOCK-SIZE Set the I/O block size to BLOCK-SIZE * 512 bytes -B Set the I/O block size to 5120 bytes After trying to use the option and seeing (with strace) that the read and write sizes weren't changing accordingly, I looked at the code and found indications that these options are ignored in copy-pass mode: in main.c, lines 764-765: in_buf_size = DISK_IO_BLOCK_SIZE; out_buf_size = DISK_IO_BLOCK_SIZE; in util.c, line 221: num_bytes = (num_bytes < DISK_IO_BLOCK_SIZE) ? num_bytes : DISK_IO_BLOCK_SIZE; Since DISK_IO_BLOCK_SIZE is a macro defined as 512, I don't see how I could ever change the block size at runtime. Am I misunderstanding cpio's usage, or is there a bug in cpio or its usage message? thanks, lars ============ It corresponds exactly to my conclusions after a few experiments this morning, before I swa the message from Lars. I'll ask the same question: Am I misunderstanding cpio's usage, or is there a bug in cpio or its usage message ? Thank you for your help. Jean-Baptiste
