---- 在 星期三, 2021-02-24 15:52:17 Su Yue <l@xxxxxxxxxx> 撰写 ----
>
> Cc to the author and linux-xfs, since it's xfsprogs related.
>
> On Tue 23 Feb 2021 at 21:40, Chengguang Xu <cgxu519@xxxxxxxxxxxx>
> wrote:
>
> > It seems the expected result of testcase of "Hole + Data"
> > in generic/473 is not correct, so just fix it properly.
> >
>
> But it's not proper...
>
> > Signed-off-by: Chengguang Xu <cgxu519@xxxxxxxxxxxx>
> > ---
> > tests/generic/473.out | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tests/generic/473.out b/tests/generic/473.out
> > index 75816388..f1ee5805 100644
> > --- a/tests/generic/473.out
> > +++ b/tests/generic/473.out
> > @@ -6,7 +6,7 @@ Data + Hole
> > 1: [256..287]: hole
> > Hole + Data
> > 0: [0..127]: hole
> > -1: [128..255]: data
> > +1: [128..135]: data
> >
> The line is produced by `$XFS_IO_PROG -c "fiemap -v 0 65k" $file |
> _filter_fiemap`.
> 0-64k is a hole and 64k-128k is a data extent.
> fiemap ioctl always returns *complete* ranges of extents.
Manual testing result in latest kernel like below.
[root@centos test]# uname -a
Linux centos 5.11.0+ #5 SMP Tue Feb 23 21:02:27 CST 2021 x86_64 x86_64 x86_64 GNU/Linux
[root@centos test]# xfs_io -V
xfs_io version 5.0.0
[root@centos test]# stat a
File: a
Size: 4194304 Blocks: 0 IO Block: 4096 regular file
Device: fc01h/64513d Inode: 140 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Access: 2021-02-24 16:33:20.235654140 +0800
Modify: 2021-02-24 16:33:25.070641521 +0800
Change: 2021-02-24 16:33:25.070641521 +0800
Birth: -
[root@centos test]# xfs_io -c "pwrite 64k 64k" a
wrote 65536/65536 bytes at offset 65536
64 KiB, 16 ops; 0.0000 sec (992.063 MiB/sec and 253968.2540 ops/sec)
[root@VM-8-4-centos test]# xfs_io -c "fiemap -v 0 65k" a
a:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: hole 128
1: [128..135]: 360..367 8 0x1
[root@centos test]# xfs_io -c "fiemap -v 0 128k" a
a:
EXT: FILE-OFFSET BLOCK-RANGE TOTAL FLAGS
0: [0..127]: hole 128
1: [128..255]: 360..487 128 0x1
>
> You may ask why the ending hole range is not aligned to 128 in
> 473.out. Because
> fiemap ioctl returns nothing of querying holes. xfs_io does the
> extra
> print work for holes.
>
> xfsprogs-dev/io/fiemap.c:
> for holes:
> 153 if (lstart > llast) {
> 154 print_hole(0, 0, 0, cur_extent, lflag, true, llast,
> lstart);
> 155 cur_extent++;
> 156 num_printed++;
> 157 }
>
> for the ending hole:
> 381 if (cur_extent && last_logical < range_end)
> 382 print_hole(foff_w, boff_w, tot_w, cur_extent, lflag,
> !vflag,
> 383 BTOBBT(last_logical), BTOBBT(range_end));
>
> > Hole + Data + Hole
> > 0: [0..127]: hole
> > 1: [128..255]: data
>
