From 9c9f5a2f1944e8b6bf2b618d04b31e1c1760637e Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Mon, 18 May 2015 09:30:18 +0900 Subject: [PATCH] perf tools: Introduce copyfile_offset() function The copyfile_offset() function is to copy source data from given offset to a destination file with an offset. It'll be used to build an indexed data file. Signed-off-by: Namhyung Kim Acked-by: Jiri Olsa Cc: Adrian Hunter Cc: Andi Kleen Cc: David Ahern Cc: Frederic Weisbecker Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/r/20150304145824.GD7519@krava.brq.redhat.com Link: http://lkml.kernel.org/r/1431909055-21442-4-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/util.c | 38 +++++++++++++++++++++++++++++--------- tools/perf/util/util.h | 1 + 2 files changed, 30 insertions(+), 9 deletions(-) diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index 6104afb7e1ef..0c264bc685ac 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -145,11 +145,38 @@ out: return err; } +int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size) +{ + void *ptr; + loff_t pgoff; + + pgoff = off_in & ~(page_size - 1); + off_in -= pgoff; + + ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff); + if (ptr == MAP_FAILED) + return -1; + + while (size) { + ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out); + if (ret < 0 && errno == EINTR) + continue; + if (ret <= 0) + break; + + size -= ret; + off_in += ret; + off_out -= ret; + } + munmap(ptr, off_in + size); + + return size ? -1 : 0; +} + int copyfile_mode(const char *from, const char *to, mode_t mode) { int fromfd, tofd; struct stat st; - void *addr; int err = -1; if (stat(from, &st)) @@ -166,15 +193,8 @@ int copyfile_mode(const char *from, const char *to, mode_t mode) if (tofd < 0) goto out_close_from; - addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0); - if (addr == MAP_FAILED) - goto out_close_to; - - if (write(tofd, addr, st.st_size) == st.st_size) - err = 0; + err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size); - munmap(addr, st.st_size); -out_close_to: close(tofd); if (err) unlink(to); diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h index c4fe38ac8c00..8bce58b47a82 100644 --- a/tools/perf/util/util.h +++ b/tools/perf/util/util.h @@ -252,6 +252,7 @@ int mkdir_p(char *path, mode_t mode); int rm_rf(char *path); int copyfile(const char *from, const char *to); int copyfile_mode(const char *from, const char *to, mode_t mode); +int copyfile_offset(int fromfd, loff_t from_ofs, int tofd, loff_t to_ofs, u64 size); s64 perf_atoll(const char *str); char **argv_split(const char *str, int *argcp); -- 2.20.1