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authorLinus Torvalds <torvalds@linux-foundation.org>2015-02-12 21:50:21 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-12 21:50:21 (GMT)
commit6bec0035286119eefc32a5b1102127e6a4032cb2 (patch)
tree440fab001b4c877b0b0c9fd62d8392e956e387e3 /mm/madvise.c
parent5d8e7fb6916556e9b476de33404e8c9e2c9aee61 (diff)
parent15d0f5ea348b9c4e6d41df294dde38a56a39c7bf (diff)
downloadlinux-6bec0035286119eefc32a5b1102127e6a4032cb2.tar.xz
Merge branch 'for-3.20/bdi' of git://git.kernel.dk/linux-block
Pull backing device changes from Jens Axboe: "This contains a cleanup of how the backing device is handled, in preparation for a rework of the life time rules. In this part, the most important change is to split the unrelated nommu mmap flags from it, but also removing a backing_dev_info pointer from the address_space (and inode), and a cleanup of other various minor bits. Christoph did all the work here, I just fixed an oops with pages that have a swap backing. Arnd fixed a missing export, and Oleg killed the lustre backing_dev_info from staging. Last patch was from Al, unexporting parts that are now no longer needed outside" * 'for-3.20/bdi' of git://git.kernel.dk/linux-block: Make super_blocks and sb_lock static mtd: export new mtd_mmap_capabilities fs: make inode_to_bdi() handle NULL inode staging/lustre/llite: get rid of backing_dev_info fs: remove default_backing_dev_info fs: don't reassign dirty inodes to default_backing_dev_info nfs: don't call bdi_unregister ceph: remove call to bdi_unregister fs: remove mapping->backing_dev_info fs: export inode_to_bdi and use it in favor of mapping->backing_dev_info nilfs2: set up s_bdi like the generic mount_bdev code block_dev: get bdev inode bdi directly from the block device block_dev: only write bdev inode on close fs: introduce f_op->mmap_capabilities for nommu mmap support fs: kill BDI_CAP_SWAP_BACKED fs: deduplicate noop_backing_dev_info
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 d79fb5e..1077cbd 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 */