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| author | Bob Peterson <rpeterso@redhat.com> | 2018-01-19 00:17:13 +0300 |
|---|---|---|
| committer | Bob Peterson <rpeterso@redhat.com> | 2018-01-19 00:17:13 +0300 |
| commit | 786ebd9f68cdf512f389e5f2d0015f1beb0777d8 (patch) | |
| tree | b4bae82884c2232f891aec11e58b38eb4fec5e5d /mm/frame_vector.c | |
| parent | 1f23bc7869fffec40b8bd9333a74a18d1de54d98 (diff) | |
| parent | 4e56a6411fbce6f859566e17298114c2434391a4 (diff) | |
| download | linux-786ebd9f68cdf512f389e5f2d0015f1beb0777d8.tar.xz | |
Merge branch 'punch-hole' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2.git
Diffstat (limited to 'mm/frame_vector.c')
| -rw-r--r-- | mm/frame_vector.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/mm/frame_vector.c b/mm/frame_vector.c index 2f98df0d460e..c64dca6e27c2 100644 --- a/mm/frame_vector.c +++ b/mm/frame_vector.c @@ -53,6 +53,20 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, ret = -EFAULT; goto out; } + + /* + * While get_vaddr_frames() could be used for transient (kernel + * controlled lifetime) pinning of memory pages all current + * users establish long term (userspace controlled lifetime) + * page pinning. Treat get_vaddr_frames() like + * get_user_pages_longterm() and disallow it for filesystem-dax + * mappings. + */ + if (vma_is_fsdax(vma)) { + ret = -EOPNOTSUPP; + goto out; + } + if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) { vec->got_ref = true; vec->is_pfns = false; |