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Re: [Bug-ddrescue] [Bulk] Re: Tip: Improving recovery chances with Seaga

From: Scott Dwyer
Subject: Re: [Bug-ddrescue] [Bulk] Re: Tip: Improving recovery chances with Seagate "F3" models
Date: Wed, 04 Jun 2014 18:56:16 -0400
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

On 6/4/2014 1:35 PM, Antonio Diaz Diaz wrote:
I mean passing an option to configure as in:
  ./configure --enable-passthrough && make && make install

This way everybody else gets a normal ddrescue built.
I am not yet sure how to do that, but I would assume that it would still involve using conditional compilation code like I mentioned. But I could be wrong. I am sure it could be figured out.

But my patch will not do anything different unless the user actually uses an option in the ddrescue command line. Just like --direct must be manually selected, so would --scsi-passthrough and --ata-passthrough, and I would not include an easy single letter that would enable it so it would have to be fully typed out (could even add a "yes-i-know-what-i-am-doing" switch for added safety). I would not even consider making a patch that did not make the passthrough an option that had to be intentionally selected.

Ddrescue already works like this. It is the kernel the one returning a total block failure when it finds a bad sector. I wish the kernel behaved better in case of read error. (Maybe some kernel version behaves as you describe. I don't know).
We will definitely talk about this more when I am finally ready for it.


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