linux-kernel - [PATCH 46/52] virtio-fs: Retrieve shm capabilities for version table

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Message-Id: <20181210171318.16998-47-vgoyal@redhat.com>
Date:   Mon, 10 Dec 2018 12:13:12 -0500
From:   Vivek Goyal <vgoyal@...hat.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     vgoyal@...hat.com, miklos@...redi.hu, stefanha@...hat.com,
        dgilbert@...hat.com, sweil@...hat.com, swhiteho@...hat.com
Subject: [PATCH 46/52] virtio-fs: Retrieve shm capabilities for version table

From: "Dr. David Alan Gilbert" <dgilbert@...hat.com>

Retrieve the capabilities needed to find the journal and version table.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@...hat.com>
---
 fs/fuse/virtio_fs.c            | 26 ++++++++++++++++++++++++--
 include/uapi/linux/virtio_fs.h |  2 ++
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index c71bc47395b4..c18f406b61cd 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -589,8 +589,11 @@ static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
 	phys_addr_t phys_addr;
 	size_t bar_len;
 	int ret;
-	u8 have_cache, cache_bar;
-	u64 cache_offset, cache_len;
+        u8 have_cache, have_journal, have_vertab;
+        u8 cache_bar, journal_bar, vertab_bar;
+        u64 cache_offset, cache_len;
+        u64 journal_offset, journal_len;
+        u64 vertab_offset, vertab_len;
 
 	if (!IS_ENABLED(CONFIG_DAX_DRIVER))
 		return 0;
@@ -619,6 +622,25 @@ static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
 				cache_bar, cache_len, cache_offset);
         }
 
+        have_journal = virtio_pci_find_shm_cap(pci_dev,
+                                             VIRTIO_FS_PCI_SHMCAP_ID_JOURNAL,
+                                             &journal_bar, &journal_offset,
+                                             &journal_len);
+        if (have_journal) {
+                dev_notice(&vdev->dev, "Journal bar: %d len: 0x%llx @ 0x%llx\n",
+                           journal_bar, journal_len, journal_offset);
+        }
+
+        have_vertab = virtio_pci_find_shm_cap(pci_dev,
+                                             VIRTIO_FS_PCI_SHMCAP_ID_VERTAB,
+                                             &vertab_bar, &vertab_offset,
+                                             &vertab_len);
+        if (have_vertab) {
+                dev_notice(&vdev->dev, "Version table bar: %d len: 0x%llx @ 0x%llx\n",
+                           vertab_bar, vertab_len, vertab_offset);
+        }
+
+
 	/* TODO handle case where device doesn't expose BAR? */
 	ret = pci_request_region(pci_dev, cache_bar, "virtio-fs-window");
 	if (ret < 0) {
diff --git a/include/uapi/linux/virtio_fs.h b/include/uapi/linux/virtio_fs.h
index 65a9d4a0dac0..e70741ab14a8 100644
--- a/include/uapi/linux/virtio_fs.h
+++ b/include/uapi/linux/virtio_fs.h
@@ -40,5 +40,7 @@ struct virtio_fs_config {
 
 /* For the id field in virtio_pci_shm_cap */
 #define VIRTIO_FS_PCI_SHMCAP_ID_CACHE 0
+#define VIRTIO_FS_PCI_SHMCAP_ID_VERTAB 1
+#define VIRTIO_FS_PCI_SHMCAP_ID_JOURNAL 2
 
 #endif /* _UAPI_LINUX_VIRTIO_FS_H */
-- 
2.13.6