Hi Dmitry,
I only noticed this after I sent the pull request to Linus, but it
looks like this patch is triggering regression using the ext3 config:
./kvm-xfstests -c ext3 generic/285:
The failure reported by seek_santy_test is:
10. Test a huge file for offset overflow
10.01 SEEK_HOLE expected 65536 or 0, got 0. FAIL
10.02 SEEK_HOLE expected 65536 or 0, got 1. FAIL
10.03 SEEK_DATA expected 0 or 0, got -1. FAIL
10.04 SEEK_DATA expected 1 or 1, got -1. FAIL
10.05 SEEK_HOLE expected 0 or 0, got -65536. FAIL
10.06 SEEK_DATA expected -65536 or -65536, got -1. FAIL
10.07 SEEK_DATA expected -65535 or -65535, got -1. FAIL
10.08 SEEK_DATA expected -65536 or -65536, got -1. FAIL
What's strange is that if I run the commands by hand, I get a very
different failure:
root@kvm-xfstests:~# ./xfstests/src/seek_sanity_test /vdd/seek_sanity_testfile
File system magic#: 0xef53
Allocation size: 4096
Kernel does not support llseek(2) extensions SEEK_HOLE and/or SEEK_DATA. Aborting.
Using strace, the problem is that the SEEK_DATA fallocate is failing:
pwrite64(3, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"..., 8192, 0) = 8192
ftruncate64(3, 16384) = 0
_llseek(3, 0, 0xbff7fe70, SEEK_DATA) = -1 ENXIO (No such device or address)
This fails with commit 14516bb: "ext4: fix suboptimal seek_{data,hole}
extents traversial" and succeeds with its immediate predesssor commit.
I've tried looking at this, but hte fact that I'm seeing different
results when I run it by hand (sometimes I can trigger the failure
with runtests.sh, usually I can't), means that it appears to be timing
dependent.
Could you take a look?
Many thanks!!
- Ted
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