vfs: remove get_xip_mem

All callers of get_xip_mem() are now gone.  Remove checks for it,
initialisers of it, documentation of it and the only implementation of it.
 Also remove mm/filemap_xip.c as it is now empty.  Also remove
documentation of the long-gone get_xip_page().

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Andreas Dilger <andreas.dilger@intel.com>
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 4 deletions

diff --git a/fs/open.c b/fs/open.c
index 813be037b412..a293c2020676 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -667,11 +667,8 @@ int open_check_o_direct(struct file *f)
 {
         /* NB: we're sure to have correct a_ops only after f_op->open */
         if (f->f_flags & O_DIRECT) {
-                if (!f->f_mapping->a_ops ||
-                    ((!f->f_mapping->a_ops->direct_IO) &&
-                    (!f->f_mapping->a_ops->get_xip_mem))) {
+                if (!f->f_mapping->a_ops || !f->f_mapping->a_ops->direct_IO)
                         return -EINVAL;
-                }
         }
         return 0;
 }