• Jeremy Fitzhardinge's avatar
    xfs: eagerly remove vmap mappings to avoid upsetting Xen · ba4312eb
    Jeremy Fitzhardinge authored
    patch ace2e92e in mainline.
    
    XFS leaves stray mappings around when it vmaps memory to make it
    virtually contigious.  This upsets Xen if one of those pages is being
    recycled into a pagetable, since it finds an extra writable mapping of
    the page.
    
    This patch solves the problem in a brute force way, by making XFS
    always eagerly unmap its mappings.
    
    [ Stable: This works around a bug in 2.6.23.  We may come up with a
    better solution for mainline, but this seems like a low-impact fix for
    the stable kernel. ]
    Signed-off-by: default avatarJeremy Fitzhardinge <jeremy@xensource.com>
    Cc: XFS masters <xfs-masters@oss.sgi.com>
    Cc: Morten =?utf-8?q?B=C3=B8geskov?= <xen-users@morten.bogeskov.dk>
    Cc: Mark Williamson <mark.williamson@cl.cam.ac.uk>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    
    ba4312eb
xfs_buf.c 41.6 KB