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virtiofs: set up virtio_fs dax_device

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Setup a dax device.

Use the shm capability to find the cache entry and map it.

The DAX window is accessed by the fs/dax.c infrastructure and must have
struct pages (at least on x86).  Use devm_memremap_pages() to map the
DAX window PCI BAR and allocate struct page.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Stefan Hajnoczi
2020-08-19 18:19:46 -04:00
committed by Miklos Szeredi
parent f4fd4ae354
commit 22f3787e9d
2 changed files with 141 additions and 0 deletions
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3
include/uapi/linux/virtio_fs.h
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@@ -16,4 +16,7 @@ struct virtio_fs_config {
__le32 num_request_queues;
} __attribute__((packed));
/* For the id field in virtio_pci_shm_cap */
#define VIRTIO_FS_SHMCAP_ID_CACHE 0
#endif /* _UAPI_LINUX_VIRTIO_FS_H */