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From: R.E.Wolff@BitWizard.nl (Rogier Wolff)
To: Linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: DD-ing from device to device.
Date: Sun, 18 Nov 2001 14:26:19 +0100 (MET)	[thread overview]
Message-ID: <200111181326.OAA28770@cave.bitwizard.nl> (raw)


Hi,

I should NOT get a "file too large" error when copying from a device
to a device, right?

I should NOT get a "file too large" if the files are openeed using
the "O_LARGEFILE" option, right?

Well: 

execve("/bin/dd", ["dd", "if=/dev/hda", "of=/dev/hdc", "bs=1024k", "count=10"], [/* 46 vars */]) = 0
[... libs and stuff ... ]
open("/dev/hda", O_RDONLY|O_LARGEFILE)  = 4
open("/dev/hdc", O_RDWR|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 5
[....signals and stuff. ]
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
munmap(0x400fb000, 1052672)             = 0
write(2, "10+0 records in\n", 16)       = 16
write(2, "10+0 records out\n", 17)      = 17
close(4)                                = 0
close(5)                                = 0
_exit(0)                                = ?


But without the "count=10" I get: 

read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048576
read(4, ""..., 1048576) = 1048576
write(5, ""..., 1048576) = 1048575
write(5, ".", 1)                     = -1 EFBIG (File too large)



This is on 2.2.14. I Could swear we made a working copy of a disk 30
minutes earlier....

	Roger. 

-- 
** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2137555 **
*-- BitWizard writes Linux device drivers for any device you may have! --*
* There are old pilots, and there are bold pilots. 
* There are also old, bald pilots. 

             reply	other threads:[~2001-11-18 13:26 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-11-18 13:26 Rogier Wolff [this message]
2001-11-19 17:13 ` DD-ing from device to device Andreas Dilger
2001-11-19 17:28   ` Rogier Wolff
2001-11-19 19:51     ` Marius Gedminas
2001-11-19 20:02     ` Andreas Dilger
2001-11-19 20:13       ` Rogier Wolff
2001-11-19 20:50         ` Andreas Dilger

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