Merge: dm: Add interface for probing active paths of a multipath device

MR: https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-10/-/merge_requests/1004

JIRA: https://issues.redhat.com/browse/RHEL-89481
Tested: Verified feature works as intended.
Upstream Status: kernel/git/torvalds/linux.git

In order to enable QEMU to handle path failures with scsi passthrough using
SG_IO ioctls on top of multipath devices, dm multipath now provides an
interface to check the active paths and fail the one that are not working.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>

Approved-by: Hanna Czenczek <hreitz@redhat.com>
Approved-by: Kevin Wolf <kwolf@redhat.com>
Approved-by: CKI KWF Bot <cki-ci-bot+kwf-gitlab-com@redhat.com>

Merged-by: CKI GitLab Kmaint Pipeline Bot <26919896-cki-kmaint-pipeline-bot@users.noreply.gitlab.com>

Author: CKI KWF Bot

drivers/md/dm-dust.c

@@ -534,7 +534,9 @@ static void dust_status(struct dm_target *ti, status_type_t type,
 	}
 }
 
-static int dust_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
+static int dust_prepare_ioctl(struct dm_target *ti, struct block_device **bdev,
+			      unsigned int cmd, unsigned long arg,
+			      bool *forward)
 {
 	struct dust_device *dd = ti->private;
 	struct dm_dev *dev = dd->dev;

drivers/md/dm-ebs-target.c

@@ -415,7 +415,8 @@ static void ebs_status(struct dm_target *ti, status_type_t type,
 	}
 }
 
-static int ebs_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
+static int ebs_prepare_ioctl(struct dm_target *ti, struct block_device **bdev,
+			     unsigned int cmd, unsigned long arg, bool *forward)
 {
 	struct ebs_c *ec = ti->private;
 	struct dm_dev *dev = ec->dev;

drivers/md/dm-flakey.c

@@ -638,7 +638,9 @@ static void flakey_status(struct dm_target *ti, status_type_t type,
 	}
 }
 
-static int flakey_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
+static int flakey_prepare_ioctl(struct dm_target *ti, struct block_device **bdev,
+				unsigned int cmd, unsigned long arg,
+				bool *forward)
 {
 	struct flakey_c *fc = ti->private;
 

drivers/md/dm-ioctl.c

@@ -1885,6 +1885,7 @@ static ioctl_fn lookup_ioctl(unsigned int cmd, int *ioctl_flags)
 		{DM_DEV_SET_GEOMETRY_CMD, 0, dev_set_geometry},
 		{DM_DEV_ARM_POLL_CMD, IOCTL_FLAGS_NO_PARAMS, dev_arm_poll},
 		{DM_GET_TARGET_VERSION_CMD, 0, get_target_version},
+		{DM_MPATH_PROBE_PATHS_CMD, 0, NULL}, /* block device ioctl */
 	};
 
 	if (unlikely(cmd >= ARRAY_SIZE(_ioctls)))

drivers/md/dm-linear.c

@@ -119,7 +119,9 @@ static void linear_status(struct dm_target *ti, status_type_t type,
 	}
 }
 
-static int linear_prepare_ioctl(struct dm_target *ti, struct block_device **bdev)
+static int linear_prepare_ioctl(struct dm_target *ti, struct block_device **bdev,
+				unsigned int cmd, unsigned long arg,
+				bool *forward)
 {
 	struct linear_c *lc = ti->private;
 	struct dm_dev *dev = lc->dev;

drivers/md/dm-log-writes.c

@@ -818,7 +818,9 @@ static void log_writes_status(struct dm_target *ti, status_type_t type,
 }
 
 static int log_writes_prepare_ioctl(struct dm_target *ti,
-				    struct block_device **bdev)
+				    struct block_device **bdev,
+				    unsigned int cmd, unsigned long arg,
+				    bool *forward)
 {
 	struct log_writes_c *lc = ti->private;
 	struct dm_dev *dev = lc->dev;