Failing to write more than 2147479552, unclear message

[GoogleCodeExporter]

What steps will reproduce the problem?
1. ioping . -s 4G (actually starting from 2G)


What is the expected output? What do you see instead?

I expect normal workflow, instead I get:
ioping: write failed: Success

What version of the product are you using? On what operating system?

Centos 7.1
3.10.0-123.20.1.el7.x86_64
ioping 0.8

Please provide any additional information below.
At least the output does not lead to anywhere near problem. I have about 20Gig 
free, and it fails to write 2147479552. I use xfs here, and the limit is: 
Maximum File Size = 9 Million TB = 9 ExaB. It may be a problem on my system, 
yet the message given is unclear.

An excerpt from strace:
open("./ioping.jIXgE6", O_RDWR|O_CREAT|O_EXCL, 0600) = 3
unlink("./ioping.jIXgE6")               = 0
pwrite(3, "********************************"..., 4294967296, 0) = 2147479552
write(2, "ioping: ", 8ioping: )                 = 8
write(2, "write failed", 12write failed)            = 12
write(2, ": ", 2: )                       = 2
write(2, "Success\n", 8Success
)                = 8

Original issue reported on code.google.com by mike.mer...@gmail.com on 25 Mar 2015 at 5:06

[GoogleCodeExporter]

That's kernel limitation: syscalls read/write can handle up to MAX_RW_COUNT = 
2G-4K = 2147479552 at once.

I'll do something with that.

Original comment by koct9i on 25 Mar 2015 at 6:11

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[GoogleCodeExporter]

There are people on the internet suggesting using pwrite in a loop. At the 
first glance it seemed to me that pwrite arguments in the loop are messed up. 
I'll try to do something with it too.

Original comment by mike.mer...@gmail.com on 26 Mar 2015 at 6:13

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[GoogleCodeExporter]

fixed in git version

Original comment by koct9i on 29 Mar 2015 at 12:55

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