The newly defined ioctl BIODASDCOPYPAIRSWAP takes a structure that
specifies a copy pair that should be swapped. It will call the device
discipline function to perform the swap operation.
The structure looks as followed:
struct dasd_copypair_swap_data_t {
char primary[20];
char secondary[20];
__u8 reserved[64];
};
where primary is the old primary device that will be replaced by the
secondary device. The old primary will become a secondary device
afterwards.
Signed-off-by: Stefan Haberland <sth@xxxxxxxxxxxxx>
Reviewed-by: Jan Hoeppner <hoeppner@xxxxxxxxxxxxx>
---
arch/s390/include/uapi/asm/dasd.h | 14 ++++++++
drivers/s390/block/dasd_ioctl.c | 53 +++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+)
diff --git a/arch/s390/include/uapi/asm/dasd.h b/arch/s390/include/uapi/asm/dasd.h
index 9ec86fae9980..93d1ccd3304c 100644
--- a/arch/s390/include/uapi/asm/dasd.h
+++ b/arch/s390/include/uapi/asm/dasd.h
@@ -182,6 +182,18 @@ typedef struct format_data_t {
unsigned int intensity;
} format_data_t;
+/*
+ * struct dasd_copypair_swap_data_t
+ * represents all data necessary to issue a swap of the copy pair relation
+ */
+struct dasd_copypair_swap_data_t {
+ char primary[20]; /* BUSID of primary */
+ char secondary[20]; /* BUSID of secondary */
+
+ /* Reserved for future updates. */
+ __u8 reserved[64];
+};
+
/*
* values to be used for format_data_t.intensity
* 0/8: normal format
@@ -326,6 +338,8 @@ struct dasd_snid_ioctl_data {
#define BIODASDSATTR _IOW(DASD_IOCTL_LETTER,2,attrib_data_t)
/* Release Allocated Space */
#define BIODASDRAS _IOW(DASD_IOCTL_LETTER, 3, format_data_t)
+/* Swap copy pair relation */
+#define BIODASDCOPYPAIRSWAP _IOW(DASD_IOCTL_LETTER, 4, struct dasd_copypair_swap_data_t)
/* Get Sense Path Group ID (SNID) data */
#define BIODASDSNID _IOWR(DASD_IOCTL_LETTER, 1, struct dasd_snid_ioctl_data)
diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 95349f95758c..d0ddf2cc9786 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -379,6 +379,56 @@ static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp
return rc;
}
+/*
+ * Swap driver iternal copy relation.
+ */
+static int
+dasd_ioctl_copy_pair_swap(struct block_device *bdev, void __user *argp)
+{
+ struct dasd_copypair_swap_data_t data;
+ struct dasd_device *device;
+ int rc;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ device = dasd_device_from_gendisk(bdev->bd_disk);
+ if (!device)
+ return -ENODEV;
+
+ if (copy_from_user(&data, argp, sizeof(struct dasd_copypair_swap_data_t))) {
+ dasd_put_device(device);
+ return -EFAULT;
+ }
+ if (memchr_inv(data.reserved, 0, sizeof(data.reserved))) {
+ pr_warn("%s: Ivalid swap data specified.\n",
+ dev_name(&device->cdev->dev));
+ dasd_put_device(device);
+ return DASD_COPYPAIRSWAP_INVALID;
+ }
+ if (bdev_is_partition(bdev)) {
+ pr_warn("%s: The specified DASD is a partition and cannot be swapped\n",
+ dev_name(&device->cdev->dev));
+ dasd_put_device(device);
+ return DASD_COPYPAIRSWAP_INVALID;
+ }
+ if (!device->copy) {
+ pr_warn("%s: The specified DASD has no copy pair set up\n",
+ dev_name(&device->cdev->dev));
+ dasd_put_device(device);
+ return -ENODEV;
+ }
+ if (!device->discipline->copy_pair_swap) {
+ dasd_put_device(device);
+ return -EOPNOTSUPP;
+ }
+ rc = device->discipline->copy_pair_swap(device, data.primary,
+ data.secondary);
+ dasd_put_device(device);
+
+ return rc;
+}
+
#ifdef CONFIG_DASD_PROFILE
/*
* Reset device profile information
@@ -637,6 +687,9 @@ int dasd_ioctl(struct block_device *bdev, fmode_t mode,
case BIODASDRAS:
rc = dasd_ioctl_release_space(bdev, argp);
break;
+ case BIODASDCOPYPAIRSWAP:
+ rc = dasd_ioctl_copy_pair_swap(bdev, argp);
+ break;
default:
/* if the discipline has an ioctl method try it. */
rc = -ENOTTY;
--
2.34.1
