At 2019-09-04 01:54:21, "Eric Sandeen" <sandeen@xxxxxxxxxx> wrote: >On 9/3/19 6:19 AM, Jianhong.Yin wrote: >> Related bug: >> copy_file_range return "Invalid argument" when copy in the same file >> https://bugzilla.kernel.org/show_bug.cgi?id=202935 > >that's a CIFS bug though, not related to how xfs_io operates, correct? Hi Eric that's right, I thought that the condition to reproduce the bug must be fd_in == fd_out. but now I know that's not correct. src_file == dst_file is enough. but there's a little problem, if exec follow command , will truncate src_file # xfs_io -c "copy_range testfile" testfile it's not expected, will send new patch to fix it. if you agree Jianhong > >What is the failing xfs_io case? Because this seems to work fine here: > ># fallocate -l 128m testfile ># strace -eopen,copy_file_range xfs_io -c "copy_range -s 1m -d 8m -l 2m testfile" testfile >... >open("testfile", O_RDWR) = 3 >... >open("testfile", O_RDONLY) = 4 >copy_file_range(4, [1048576], 3, [8388608], 2097152, 0) = 2097152 >+++ exited with 0 +++ > >this works too: > ># strace -eopen,copy_file_range xfs_io -c "copy_range testfile" testfile >... >open("testfile", O_RDWR) = 3 >... >open("testfile", O_RDONLY) = 4 >copy_file_range(4, [0], 3, [0], 134217728, 0) = 0 >+++ exited with 0 +++ > >so can you help me understand what bug you're fixing? > >-Eric > >> if argument of option -f is "-", use current file->fd as fd_in >> >> Usage: >> xfs_io -c 'copy_range -f -' some_file >> >> Signed-off-by: Jianhong Yin <yin-jianhong@xxxxxxx> >> --- >> io/copy_file_range.c | 27 ++++++++++++++++++--------- >> 1 file changed, 18 insertions(+), 9 deletions(-) >> >> diff --git a/io/copy_file_range.c b/io/copy_file_range.c >> index b7b9fd88..2dde8a31 100644 >> --- a/io/copy_file_range.c >> +++ b/io/copy_file_range.c >> @@ -28,6 +28,7 @@ copy_range_help(void) >> at position 0\n\ >> 'copy_range -f 2' - copies all bytes from open file 2 into the current open file\n\ >> at position 0\n\ >> + 'copy_range -f -' - copies all bytes from current open file append the current open file\n\ >> ")); >> } >> >> @@ -114,11 +115,15 @@ copy_range_f(int argc, char **argv) >> } >> break; >> case 'f': >> - src_file_nr = atoi(argv[1]); >> - if (src_file_nr < 0 || src_file_nr >= filecount) { >> - printf(_("file value %d is out of range (0-%d)\n"), >> - src_file_nr, filecount - 1); >> - return 0; >> + if (strcmp(argv[1], "-") == 0) >> + src_file_nr = (file - &filetable[0]) / sizeof(fileio_t); >> + else { >> + src_file_nr = atoi(argv[1]); >> + if (src_file_nr < 0 || src_file_nr >= filecount) { >> + printf(_("file value %d is out of range (0-%d)\n"), >> + src_file_nr, filecount - 1); >> + return 0; >> + } >> } >> /* Expect no src_path arg */ >> src_path_arg = 0; >> @@ -147,10 +152,14 @@ copy_range_f(int argc, char **argv) >> } >> len = sz; >> >> - ret = copy_dst_truncate(); >> - if (ret < 0) { >> - ret = 1; >> - goto out; >> + if (fd != file->fd) { >> + ret = copy_dst_truncate(); >> + if (ret < 0) { >> + ret = 1; >> + goto out; >> + } >> + } else { >> + dst = sz; >> } >> } >> >>
