linux-ext4 - Re: ll_ver_fs data verification failure

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Message-ID: <19332.1249599272@alphaville.usa.hp.com>
Date:	Thu, 06 Aug 2009 18:54:32 -0400
From:	Nick Dokos <nicholas.dokos@...com>
To:	Andreas Dilger <adilger@....com>
Cc:	nicholas.dokos@...com
Subject: Re: ll_ver_fs data verification failure - 96TB fs 

> ... 
> The code should  perhaps read something like this:
> 
>  		if ((nread = read(fd, chunk_buf, chunksize)) < 0) {
>  			fprintf(stderr, "\n%s: read %s+%llu failed: %s\n",
>  				progname, file, offset, strerror(errno));
>  			return 1;
>  		}
>                 if (nread < chunksize) {
>                         fprintf(stderr, "short read etc");
>                         /* or force the next read() to check for errors? */
>                         return 1;
>                 }
>  		if (verify_chunk(chunk_buf, chunksize, offset, time_st,
>  				 inode_st, file) != 0)
>  			return 1;
> 

... except that the write() side also does not deal with short writes,
and for a full run, the last file of the last directory will probably be
short even if no errors occur. In that case, the short read is not an
error.

Thanks,
Nick
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