PR252358 reported a serious performance problem when copying a large non-sparse file on a UFS file system. This problem seems to have been caused by a large number of SEEK_HOLE operations, with one done for each copy_file_range(2) call. This patch modifies cp(1) to use a large (SSIZE_MAX) len argument, reducing the number of system calls and resolving the performance issue. While here, convert the type of the "rcount" from "int" to "ssize_t" so that it is consistent with that returned by both read(2) and copy_file_range(2). PR: 252358 Reviewed by: asomers Differential Revision: https://reviews.freebsd.org/D27937 |
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.. | ||
tests | ||
cp.1 | ||
cp.c | ||
extern.h | ||
Makefile | ||
Makefile.depend | ||
utils.c |