[PATCH v2 11/34] xen: port block device access to file

Christian Brauner
2024-01-23T13:27:26Z

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
drivers/block/xen-blkback/blkback.c | 4 ++--
drivers/block/xen-blkback/common.h | 4 ++--
drivers/block/xen-blkback/xenbus.c | 37 ++++++++++++++++++-------------------
3 files changed, 22 insertions(+), 23 deletions(-)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 4defd7f387c7..944576d582fb 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -465,7 +465,7 @@ static int xen_vbd_translate(struct phys_req *req, struct xen_blkif *blkif,
}

req->dev = vbd->pdevice;
- req->bdev = vbd->bdev_handle->bdev;
+ req->bdev = file_bdev(vbd->bdev_file);
rc = 0;

out:
@@ -969,7 +969,7 @@ static int dispatch_discard_io(struct xen_blkif_ring *ring,
int err = 0;
int status = BLKIF_RSP_OKAY;
struct xen_blkif *blkif = ring->blkif;
- struct block_device *bdev = blkif->vbd.bdev_handle->bdev;
+ struct block_device *bdev = file_bdev(blkif->vbd.bdev_file);
struct phys_req preq;

xen_blkif_get(blkif);
diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index 1432c83183d0..b427d54bc120 100644
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -221,7 +221,7 @@ struct xen_vbd {
unsigned char type;
/* phys device that this vbd maps to. */
u32 pdevice;
- struct bdev_handle *bdev_handle;
+ struct file *bdev_file;
/* Cached size parameter. */
sector_t size;
unsigned int flush_support:1;
@@ -360,7 +360,7 @@ struct pending_req {
};

-#define vbd_sz(_v) bdev_nr_sectors((_v)->bdev_handle->bdev)
+#define vbd_sz(_v) bdev_nr_sectors(file_bdev((_v)->bdev_file))

#define xen_blkif_get(_b) (atomic_inc(&(_b)->refcnt))
#define xen_blkif_put(_b) \
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index e34219ea2b05..0621878940ae 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -81,7 +81,7 @@ static void xen_update_blkif_status(struct xen_blkif *blkif)
int i;

/* Not ready to connect? */
- if (!blkif->rings || !blkif->rings[0].irq || !blkif->vbd.bdev_handle)
+ if (!blkif->rings || !blkif->rings[0].irq || !blkif->vbd.bdev_file)
return;

/* Already connected? */
@@ -99,13 +99,12 @@ static void xen_update_blkif_status(struct xen_blkif *blkif)
return;
}

- err = sync_blockdev(blkif->vbd.bdev_handle->bdev);
+ err = sync_blockdev(file_bdev(blkif->vbd.bdev_file));
if (err) {
xenbus_dev_error(blkif->be->dev, err, "block flush");
return;
}
- invalidate_inode_pages2(
- blkif->vbd.bdev_handle->bdev->bd_inode->i_mapping);
+ invalidate_inode_pages2(blkif->vbd.bdev_file->f_mapping);

for (i = 0; i < blkif->nr_rings; i++) {
ring = &blkif->rings[i];
@@ -473,9 +472,9 @@ static void xenvbd_sysfs_delif(struct xenbus_device *dev)

static void xen_vbd_free(struct xen_vbd *vbd)
{
- if (vbd->bdev_handle)
- bdev_release(vbd->bdev_handle);
- vbd->bdev_handle = NULL;
+ if (vbd->bdev_file)
+ fput(vbd->bdev_file);
+ vbd->bdev_file = NULL;
}

static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle,
@@ -483,7 +482,7 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle,
int cdrom)
{
struct xen_vbd *vbd;
- struct bdev_handle *bdev_handle;
+ struct file *bdev_file;

vbd = &blkif->vbd;
vbd->handle = handle;
@@ -492,17 +491,17 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle,

vbd->pdevice = MKDEV(major, minor);

- bdev_handle = bdev_open_by_dev(vbd->pdevice, vbd->readonly ?
+ bdev_file = bdev_file_open_by_dev(vbd->pdevice, vbd->readonly ?
BLK_OPEN_READ : BLK_OPEN_WRITE, NULL, NULL);

- if (IS_ERR(bdev_handle)) {
+ if (IS_ERR(bdev_file)) {
pr_warn("xen_vbd_create: device %08x could not be opened\n",
vbd->pdevice);
return -ENOENT;
}

- vbd->bdev_handle = bdev_handle;
- if (vbd->bdev_handle->bdev->bd_disk == NULL) {
+ vbd->bdev_file = bdev_file;
+ if (file_bdev(vbd->bdev_file)->bd_disk == NULL) {
pr_warn("xen_vbd_create: device %08x doesn't exist\n",
vbd->pdevice);
xen_vbd_free(vbd);
@@ -510,14 +509,14 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle,
}
vbd->size = vbd_sz(vbd);

- if (cdrom || disk_to_cdi(vbd->bdev_handle->bdev->bd_disk))
+ if (cdrom || disk_to_cdi(file_bdev(vbd->bdev_file)->bd_disk))
vbd->type |= VDISK_CDROM;
- if (vbd->bdev_handle->bdev->bd_disk->flags & GENHD_FL_REMOVABLE)
+ if (file_bdev(vbd->bdev_file)->bd_disk->flags & GENHD_FL_REMOVABLE)
vbd->type |= VDISK_REMOVABLE;

- if (bdev_write_cache(bdev_handle->bdev))
+ if (bdev_write_cache(file_bdev(bdev_file)))
vbd->flush_support = true;
- if (bdev_max_secure_erase_sectors(bdev_handle->bdev))
+ if (bdev_max_secure_erase_sectors(file_bdev(bdev_file)))
vbd->discard_secure = true;

pr_debug("Successful creation of handle=%04x (dom=%u)\n",
@@ -570,7 +569,7 @@ static void xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info
struct xen_blkif *blkif = be->blkif;
int err;
int state = 0;
- struct block_device *bdev = be->blkif->vbd.bdev_handle->bdev;
+ struct block_device *bdev = file_bdev(be->blkif->vbd.bdev_file);

if (!xenbus_read_unsigned(dev->nodename, "discard-enable", 1))
return;
@@ -932,7 +931,7 @@ static void connect(struct backend_info *be)
}
err = xenbus_printf(xbt, dev->nodename, "sector-size", "%lu",
(unsigned long)bdev_logical_block_size(
- be->blkif->vbd.bdev_handle->bdev));
+ file_bdev(be->blkif->vbd.bdev_file)));
if (err) {
xenbus_dev_fatal(dev, err, "writing %s/sector-size",
dev->nodename);
@@ -940,7 +939,7 @@ static void connect(struct backend_info *be)
}
err = xenbus_printf(xbt, dev->nodename, "physical-sector-size", "%u",
bdev_physical_block_size(
- be->blkif->vbd.bdev_handle->bdev));
+ file_bdev(be->blkif->vbd.bdev_file)));
if (err)
xenbus_dev_error(dev, err, "writing %s/physical-sector-size",
dev->nodename);

--
2.43.0