mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-06 02:50:43 +00:00
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 <namhyung@kernel.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> 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 <acme@redhat.com>
This commit is contained in:
parent
0b1de0be1e
commit
9c9f5a2f19
2 changed files with 30 additions and 9 deletions
|
@ -145,11 +145,38 @@ static int slow_copyfile(const char *from, const char *to, mode_t mode)
|
||||||
return err;
|
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 copyfile_mode(const char *from, const char *to, mode_t mode)
|
||||||
{
|
{
|
||||||
int fromfd, tofd;
|
int fromfd, tofd;
|
||||||
struct stat st;
|
struct stat st;
|
||||||
void *addr;
|
|
||||||
int err = -1;
|
int err = -1;
|
||||||
|
|
||||||
if (stat(from, &st))
|
if (stat(from, &st))
|
||||||
|
@ -166,15 +193,8 @@ int copyfile_mode(const char *from, const char *to, mode_t mode)
|
||||||
if (tofd < 0)
|
if (tofd < 0)
|
||||||
goto out_close_from;
|
goto out_close_from;
|
||||||
|
|
||||||
addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
|
err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
|
||||||
if (addr == MAP_FAILED)
|
|
||||||
goto out_close_to;
|
|
||||||
|
|
||||||
if (write(tofd, addr, st.st_size) == st.st_size)
|
|
||||||
err = 0;
|
|
||||||
|
|
||||||
munmap(addr, st.st_size);
|
|
||||||
out_close_to:
|
|
||||||
close(tofd);
|
close(tofd);
|
||||||
if (err)
|
if (err)
|
||||||
unlink(to);
|
unlink(to);
|
||||||
|
|
|
@ -252,6 +252,7 @@ int mkdir_p(char *path, mode_t mode);
|
||||||
int rm_rf(char *path);
|
int rm_rf(char *path);
|
||||||
int copyfile(const char *from, const char *to);
|
int copyfile(const char *from, const char *to);
|
||||||
int copyfile_mode(const char *from, const char *to, mode_t mode);
|
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);
|
s64 perf_atoll(const char *str);
|
||||||
char **argv_split(const char *str, int *argcp);
|
char **argv_split(const char *str, int *argcp);
|
||||||
|
|
Loading…
Reference in a new issue