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Date:   Fri, 15 Jan 2021 22:24:10 -0500
From:   Michael Katzmann <>
Subject: Re: Changing sd device from read only to read/write fails in 5.10 (BLKROSET)

Sorry, that test in the end was inverted of course.. it should read

if( (DeviceFD = open( /dev/sdb, O_RDWR )) != ERROR ) {
   printf("success\n"); // <== use to work (open R/W)
} else {
   printf("failure");   // <== now fails under kernel 5.10

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