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Description of problem:
The BIO_ definitions are meant to be ored into the bi_flags field like so:
bio->bi_flags |= (1<<BIO_*);
There are a couple of places in the upstream kernel that get this wrong, doing instead:
bio->bi_flags |= BIO_*;
In RHEL 6, there is only one such issue. Note that in RHEL 6 we have convenience macros for discard flush and fua (BIO_DISCARD, BIO_FLUSH, BIO_FUA), which already do the bit shifting.
Initially reported upstream here:
http://groups.google.com/group/linux.kernel/browse_thread/thread/87487f9987731480/da7877b036bfac34?show_docid=da7877b036bfac34&pli=1
Version-Release number of selected component (if applicable):
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Comment 1RHEL Program Management
2012-03-01 18:09:37 UTC
This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update release.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHSA-2012-0862.html