Daan De Meyer
8b9fb1bbec
loop_write() writes one buffer at the file position. To write at an offset, callers call pwrite() or pwritev() directly and handle short writes themselves. Add pwritev_full(), which writes all iovecs at an offset, retries on EINTR and short writes, splits batches larger than IOV_MAX, and reports the number of bytes written, also on failure. Add pwrite_full(), which does the same for one buffer. (cherry picked from commit 4d36be491a568180dc6336b91b0c496bb8cb6601)
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