On Fri, Nov 17, 2017 at 12:25 PM, Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> wrote: > Add support for a new -S flag to xfs_io's mmap command. This opens the > mapping with the (MAP_SYNC | MAP_SHARED_VALIDATE) flags instead of the > standard MAP_SHARED flag. > > Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx> > Suggested-by: Dave Chinner <david@xxxxxxxxxxxxx> > --- > configure.ac | 1 + > include/builddefs.in | 1 + > include/linux.h | 5 +++++ > io/io.h | 1 + > io/mmap.c | 19 ++++++++++++++----- > m4/package_libcdev.m4 | 16 ++++++++++++++++ > man/man8/xfs_io.8 | 6 +++++- > 7 files changed, 43 insertions(+), 6 deletions(-) > > diff --git a/configure.ac b/configure.ac > index cb23fb8..7153c9f 100644 > --- a/configure.ac > +++ b/configure.ac > @@ -162,6 +162,7 @@ AC_HAVE_FSETXATTR > AC_HAVE_MREMAP > AC_NEED_INTERNAL_FSXATTR > AC_HAVE_GETFSMAP > +AC_HAVE_MAP_SYNC > > if test "$enable_blkid" = yes; then > AC_HAVE_BLKID_TOPO > diff --git a/include/builddefs.in b/include/builddefs.in > index 1d454b6..78b71fe 100644 > --- a/include/builddefs.in > +++ b/include/builddefs.in > @@ -114,6 +114,7 @@ HAVE_FSETXATTR = @have_fsetxattr@ > HAVE_MREMAP = @have_mremap@ > NEED_INTERNAL_FSXATTR = @need_internal_fsxattr@ > HAVE_GETFSMAP = @have_getfsmap@ > +HAVE_MAP_SYNC = @have_map_sync@ > > GCCFLAGS = -funsigned-char -fno-strict-aliasing -Wall > # -Wbitwise -Wno-transparent-union -Wno-old-initializer -Wno-decl > diff --git a/include/linux.h b/include/linux.h > index 6ce344c..4ee03ed 100644 > --- a/include/linux.h > +++ b/include/linux.h > @@ -327,4 +327,9 @@ fsmap_advance( > #define HAVE_GETFSMAP > #endif /* HAVE_GETFSMAP */ > > +#ifndef HAVE_MAP_SYNC > +#define MAP_SYNC 0x80000 Hmm, this is the x86 specific value of MAP_SYNC. I think it would be better to define MAP_SYNC to zero in this case and check for MAP_SYNC == 0 at run time. -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
