fs: kill BDI_CAP_SWAP_BACKED
This bdi flag isn't too useful - we can determine that a vma is backed by
either swap or shmem trivially in the caller.
This also allows removing the backing_dev_info instaces for swap and shmem
in favor of noop_backing_dev_info.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/mm/madvise.c b/mm/madvise.c
index a271adc..1383a89 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -222,19 +222,22 @@
struct file *file = vma->vm_file;
#ifdef CONFIG_SWAP
- if (!file || mapping_cap_swap_backed(file->f_mapping)) {
+ if (!file) {
*prev = vma;
- if (!file)
- force_swapin_readahead(vma, start, end);
- else
- force_shm_swapin_readahead(vma, start, end,
- file->f_mapping);
+ force_swapin_readahead(vma, start, end);
return 0;
}
-#endif
+ if (shmem_mapping(file->f_mapping)) {
+ *prev = vma;
+ force_shm_swapin_readahead(vma, start, end,
+ file->f_mapping);
+ return 0;
+ }
+#else
if (!file)
return -EBADF;
+#endif
if (file->f_mapping->a_ops->get_xip_mem) {
/* no bad return value, but ignore advice */