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authorChristoph Hellwig <hch@lst.de>2015-01-14 10:42:31 +0100
committerJens Axboe <axboe@fb.com>2015-01-20 14:02:56 -0700
commit97b713ba3ebaa6c8d84c2c720f5468a7c6a6eb4e (patch)
treea2a430b22f8c220e719114786905b18aa605f9ec /mm/madvise.c
parenta7a2c680a2ad81b3181a335ee76e23d5195007ee (diff)
downloadop-kernel-dev-97b713ba3ebaa6c8d84c2c720f5468a7c6a6eb4e.zip
op-kernel-dev-97b713ba3ebaa6c8d84c2c720f5468a7c6a6eb4e.tar.gz
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>
Diffstat (limited to 'mm/madvise.c')
-rw-r--r--mm/madvise.c17
1 files changed, 10 insertions, 7 deletions
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 @@ static long madvise_willneed(struct vm_area_struct *vma,
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 */
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