Signed-off-by: Fotis Xenakis <[email protected]>
---
drivers/virtio-fs.cc | 12 ++++++++++++
drivers/virtio-fs.hh | 10 ++++++++++
2 files changed, 22 insertions(+)
diff --git a/drivers/virtio-fs.cc b/drivers/virtio-fs.cc
index d95f7740..b7363040 100644
--- a/drivers/virtio-fs.cc
+++ b/drivers/virtio-fs.cc
@@ -180,6 +180,18 @@ void fs::read_config()
virtio_conf_read(0, &_config, sizeof(_config));
debugf("virtio-fs: Detected device with tag: [%s] and num_queues: %d\n",
_config.tag, _config.num_queues);
+
+ // Query for DAX window
+ mmioaddr_t dax_addr;
+ u64 dax_len;
+ if (_dev.get_shm(0, dax_addr, dax_len)) {
+ _dax.addr = dax_addr;
+ _dax.len = dax_len;
+ debugf("virtio-fs: Detected DAX window with length %lld\n", dax_len);
+ } else {
+ _dax.addr = mmio_nullptr;
+ _dax.len = 0;
+ }
}
void fs::req_done()
diff --git a/drivers/virtio-fs.hh b/drivers/virtio-fs.hh
index 626bd906..d1c116de 100644
--- a/drivers/virtio-fs.hh
+++ b/drivers/virtio-fs.hh
@@ -28,6 +28,12 @@ public:
u32 num_queues;
} __attribute__((packed));
+ struct dax_window {
+ mmioaddr_t addr;
+ u64 len;
+ mutex lock;
+ };
+
explicit fs(virtio_device& dev);
virtual ~fs();
@@ -35,6 +41,9 @@ public:
void read_config();
int make_request(fuse_request*);
+ dax_window* get_dax() {
+ return (_dax.addr != mmio_nullptr) ? &_dax : nullptr;
+ }
void req_done();
int64_t size();
@@ -53,6 +62,7 @@ private:
std::string _driver_name;
fs_config _config;
+ dax_window _dax;
// maintains the virtio instance number for multiple drives
static int _instance;
--
2.26.1
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