As I promised in older exofs threads, here is a client for libosd
_other_ than exofs. This block driver exports a single OSD object
as a Linux block device.
See the comment block at the top of the driver for usage instructions.
drivers/block/Kconfig | 16 +
drivers/block/Makefile | 1
drivers/block/osdblk.c | 563 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 580 insertions(+)
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index e7b8aa0..ff46b0e 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -298,6 +298,22 @@ config BLK_DEV_NBD
If unsure, say N.
+config BLK_DEV_OSD
+ tristate "OSD object-as-blkdev support"
+ depends on SCSI_OSD_INITIATOR
+ ---help---
+ Saying Y or M here will allow the exporting of a single SCSI
+ OSD (object-based storage) object as a Linux block device.
+
+ For example, if you create a 2G object on an OSD device,
+ you can then use this module to present that 2G object as
+ a Linux block device.
+
+ To compile this driver as a module, choose M here: the
+ module will be called osdblk.
+
+ If unsure, say N.
+
config BLK_DEV_SX8
tristate "Promise SATA SX8 support"
depends on PCI
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 3145141..859bf5d 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_BLK_DEV_DAC960) += DAC960.o
obj-$(CONFIG_XILINX_SYSACE) += xsysace.o
obj-$(CONFIG_CDROM_PKTCDVD) += pktcdvd.o
obj-$(CONFIG_SUNVDC) += sunvdc.o
+obj-$(CONFIG_BLK_DEV_OSD) += osdblk.o
obj-$(CONFIG_BLK_DEV_UMEM) += umem.o
obj-$(CONFIG_BLK_DEV_NBD) += nbd.o
diff --git a/drivers/block/osdblk.c b/drivers/block/osdblk.c
new file mode 100644
index 0000000..d3a2fb5
--- /dev/null
+++ b/drivers/block/osdblk.c
@@ -0,0 +1,563 @@
+
+/*
+ osdblk.c -- Export a single SCSI OSD object as a Linux block device
+
+
+ Copyright 2009 Red Hat, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING. If not, write to
+ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+ Instructions for use
+ --------------------
+
+ 1) Map a Linux block device to an existing OSD object.
+
+ In this example, we will use partition id 1234, object id 5678,
+ OSD device /dev/osd1.
+
+ $ echo "1234 5678 /dev/osd1" > /sys/class/osdblk/add
+
+
+ 2) List all active blkdev<->object mappings.
+
+ In this example, we have performed step #1 twice, creating two blkdevs,
+ mapped to two separate OSD objects.
+
+ $ cat /sys/class/osdblk/list
+ 0 174 1234 5678 /dev/osd1
+ 1 179 1994 897123 /dev/osd0
+
+ The columns, in order, are:
+ - blkdev unique id
+ - blkdev assigned major
+ - OSD object partition id
+ - OSD object id
+ - OSD device
+
+
+ 3) Remove an active blkdev<->object mapping.
+
+ $ echo 1 > /sys/class/osdblk/remove
+
+
+ NOTE: The actual creation and deletion of OSD objects is outside the scope
+ of this driver.
+
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <scsi/osd_initiator.h>
+#include <scsi/osd_attributes.h>
+#include <scsi/osd_sec.h>
+
+#define DRV_NAME "osdblk"
+#define PFX DRV_NAME ": "
+
+struct osdblk_device;
+
+enum {
+ OSDBLK_MAX_DEVS = 64,
+ OSDBLK_MINORS_PER_MAJOR = 256,
+ OSDBLK_MAX_REQ = 32,
+ OSDBLK_OP_TIMEOUT = 4 * 60,
+};
+
+struct osdblk_request {
+ struct request *rq;
+ struct bio *bio;
+ struct osdblk_device *osdev;
+ int tag;
+ uint8_t cred[OSD_CAP_LEN];
+};
+
+struct osdblk_device {
+ int id;
+
+ int major;
+ struct gendisk *disk;
+ struct request_queue *q;
+
+ struct osd_dev *osd;
+
+ char name[32];
+
+ spinlock_t lock;
+
+ struct osd_obj_id obj;
+ uint8_t obj_cred[OSD_CAP_LEN];
+
+ struct osdblk_request req[OSDBLK_MAX_REQ];
+
+ unsigned long part_id;
+ unsigned long obj_id;
+ char osd_path[0];
+};
+
+static struct class *class_osdblk; /* /sys/class/osdblk */
+static struct mutex ctl_mutex; /* Serialize open/close/setup/teardown */
+static struct osdblk_device *osdblk_devs[OSDBLK_MAX_DEVS];
+
+static struct block_device_operations osdblk_bd_ops = {
+ .owner = THIS_MODULE,
+};
+
+const struct osd_attr g_attr_logical_length = ATTR_DEF(
+ OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
+
+static void osd_make_credential(u8 cred_a[OSD_CAP_LEN],
+ const struct osd_obj_id *obj)
+{
+ osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
+}
+
+/*
+ * Perform a synchronous OSD operation.
+ */
+static int osd_sync_op(struct osd_request *or, int timeout, uint8_t *credential)
+{
+ int ret;
+
+ or->timeout = timeout;
+ ret = osd_finalize_request(or, 0, credential, NULL);
+ if (ret)
+ return ret;
+
+ ret = osd_execute_request(or);
+
+ /* osd_req_decode_sense(or, ret); */
+ return ret;
+}
+
+/*
+ * Perform an asynchronous OSD operation.
+ */
+static int osd_async_op(struct osd_request *or, osd_req_done_fn *async_done,
+ void *caller_context, u8 *cred)
+{
+ int ret;
+
+ ret = osd_finalize_request(or, 0, cred, NULL);
+ if (ret)
+ return ret;
+
+ ret = osd_execute_request_async(or, async_done, caller_context);
+
+ return ret;
+}
+
+static int extract_attr_from_req(struct osd_request *or, struct osd_attr *attr)
+{
+ struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
+ void *iter = NULL;
+ int nelem;
+
+ do {
+ nelem = 1;
+ osd_req_decode_get_attr_list(or, &cur_attr, &nelem, &iter);
+ if ((cur_attr.attr_page == attr->attr_page) &&
+ (cur_attr.attr_id == attr->attr_id)) {
+ attr->len = cur_attr.len;
+ attr->val_ptr = cur_attr.val_ptr;
+ return 0;
+ }
+ } while (iter);
+
+ return -EIO;
+}
+
+static int osdblk_get_obj_size(struct osdblk_device *osdev, u64 *size_out)
+{
+ struct osd_request *or;
+ struct osd_attr attr;
+ int ret;
+
+ osd_make_credential(osdev->obj_cred, &osdev->obj);
+
+ or = osd_start_request(osdev->osd, GFP_KERNEL);
+ if (!or)
+ return -ENOMEM;
+
+ osd_req_get_attributes(or, &osdev->obj);
+
+ osd_req_add_get_attr_list(or, &g_attr_logical_length, 1);
+
+ /* execute op synchronously */
+ ret = osd_sync_op(or, OSDBLK_OP_TIMEOUT, osdev->obj_cred);
+ if (ret)
+ goto out;
+
+ attr = g_attr_logical_length;
+ ret = extract_attr_from_req(or, &attr);
+ if (ret)
+ goto out;
+
+ *size_out = get_unaligned_be64(attr.val_ptr);
+
+out:
+ osd_end_request(or);
+ return ret;
+
+}
+
+static int osdblk_get_free_req(struct osdblk_device *osdev)
+{
+ int i;
+
+ for (i = 0; i < OSDBLK_MAX_REQ; i++) {
+ if (!osdev->req[i].rq)
+ return i;
+ }
+
+ return -1;
+}
+
+static void osdblk_end_request(struct osdblk_device *osdev,
+ struct osdblk_request *orq,
+ int error)
+{
+ struct request *rq = orq->rq;
+ int rc;
+
+ /* complete request, at block layer */
+ rc = __blk_end_request(rq, error, blk_rq_bytes(rq));
+
+ /* clear request slot for use */
+ osdev->req[orq->tag].rq = NULL;
+
+ /* restart queue, if necessary */
+ blk_start_queue(osdev->q);
+}
+
+static void osdblk_osd_complete(struct osd_request *or, void *private)
+{
+ struct osdblk_request *orq = private;
+ struct osd_sense_info osi;
+ int ret = osd_req_decode_sense(or, &osi);
+
+ if (ret)
+ ret = -EIO;
+
+ osd_end_request(or);
+ osdblk_end_request(orq->osdev, orq, ret);
+}
+
+static void osdblk_rq_fn(struct request_queue *q)
+{
+ struct osdblk_device *osdev = q->queuedata;
+ struct request *rq;
+ struct osdblk_request *orq;
+ struct osd_request *or;
+ struct bio *bio;
+ int rq_idx, do_write;
+
+ while (1) {
+ rq = elv_next_request(q);
+ if (!rq)
+ break;
+
+ do_write = (rq_data_dir(rq) == WRITE);
+
+ bio = bio_clone(rq->bio, GFP_NOIO);
+ if (!bio)
+ break;
+
+ rq_idx = osdblk_get_free_req(osdev);
+ if (rq_idx < 0) {
+ bio_put(bio);
+ blk_stop_queue(q);
+ break;
+ }
+
+ orq = &osdev->req[rq_idx];
+ orq->tag = rq_idx;
+ orq->rq = rq;
+ orq->bio = bio;
+ orq->osdev = osdev;
+
+ blkdev_dequeue_request(rq);
+
+ osd_make_credential(orq->cred, &osdev->obj);
+
+ or = osd_start_request(osdev->osd, GFP_NOIO);
+ if (!or) {
+ blk_requeue_request(q, rq);
+ bio_put(bio);
+ break;
+ }
+
+ if (do_write)
+ osd_req_write(or, &osdev->obj, bio,
+ rq->sector * 512ULL);
+ else
+ osd_req_read(or, &osdev->obj, bio,
+ rq->sector * 512ULL);
+
+ if (osd_async_op(or, osdblk_osd_complete, orq, orq->cred)) {
+ /* FIXME: leak OSD request 'or' ? */
+ blk_requeue_request(q, rq);
+ bio_put(bio);
+ }
+ }
+}
+
+static void osdblk_free_disk(struct osdblk_device *osdev)
+{
+ struct gendisk *disk = osdev->disk;
+
+ if (!disk)
+ return;
+
+ if (disk->flags & GENHD_FL_UP)
+ del_gendisk(disk);
+ if (disk->queue)
+ blk_cleanup_queue(disk->queue);
+ put_disk(disk);
+}
+
+static int osdblk_init_disk(struct osdblk_device *osdev)
+{
+ struct gendisk *disk;
+ struct request_queue *q;
+ int rc;
+ u64 obj_size = 0;
+
+ rc = osdblk_get_obj_size(osdev, &obj_size);
+ if (rc)
+ return rc;
+
+ disk = alloc_disk(OSDBLK_MINORS_PER_MAJOR);
+ if (!disk)
+ return -ENOMEM;
+
+ sprintf(disk->disk_name, DRV_NAME "/%d", osdev->id);
+ disk->major = osdev->major;
+ disk->first_minor = 0;
+ disk->fops = &osdblk_bd_ops;
+ disk->private_data = osdev;
+
+ q = blk_init_queue(osdblk_rq_fn, &osdev->lock);
+ if (!q) {
+ put_disk(disk);
+ return -ENOMEM;
+ }
+
+ disk->queue = q;
+
+ q->queuedata = osdev;
+
+ osdev->disk = disk;
+ osdev->q = q;
+
+ set_capacity(disk, obj_size);
+ add_disk(disk);
+
+ return 0;
+}
+
+/********************************************************************
+ /sys/class/osdblk/
+ add map OSD object to blkdev
+ remove unmap OSD object
+ list show mappings
+ *******************************************************************/
+
+static void class_osdblk_release(struct class *cls)
+{
+ kfree(cls);
+}
+
+static ssize_t class_osdblk_show(struct class *c, char *data)
+{
+ int n = 0;
+ int idx;
+ mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
+ for (idx = 0; idx < OSDBLK_MAX_DEVS; idx++) {
+ struct osdblk_device *osdev = osdblk_devs[idx];
+ if (!osdev)
+ continue;
+ n += sprintf(data+n, "%d %d %lu %lu %s\n",
+ osdev->id,
+ osdev->major,
+ osdev->part_id,
+ osdev->obj_id,
+ osdev->osd_path);
+ }
+ mutex_unlock(&ctl_mutex);
+ return n;
+}
+
+static ssize_t class_osdblk_add(struct class *c, const char *buf, size_t count)
+{
+ struct osdblk_device *osdev;
+ ssize_t rc;
+ int idx, irc;
+
+ osdev = kzalloc(sizeof(*osdev) + strlen(buf) + 1, GFP_KERNEL);
+ if (!osdev)
+ return -ENOMEM;
+
+ mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
+
+ for (idx = 0; idx < OSDBLK_MAX_DEVS; idx++) {
+ if (!osdblk_devs[idx]) {
+ osdblk_devs[idx] = osdev;
+ osdev->id = idx;
+ break;
+ }
+ }
+
+ mutex_unlock(&ctl_mutex);
+
+ if (idx == OSDBLK_MAX_DEVS) {
+ rc = -ENOSPC;
+ goto err_out;
+ }
+
+ if (sscanf(buf, "%lu %lu %s", &osdev->part_id, &osdev->obj_id,
+ osdev->osd_path) != 3) {
+ rc = -EINVAL;
+ goto err_out_slot;
+ }
+
+ osdev->obj.partition = osdev->part_id;
+ osdev->obj.id = osdev->obj_id;
+
+ sprintf(osdev->name, DRV_NAME "%d", osdev->id);
+ spin_lock_init(&osdev->lock);
+
+ osdev->osd = osduld_path_lookup(osdev->osd_path);
+ if (IS_ERR(osdev->osd)) {
+ rc = PTR_ERR(osdev->osd);
+ goto err_out_slot;
+ }
+
+ irc = register_blkdev(0, osdev->name);
+ if (irc < 0) {
+ rc = irc;
+ goto err_out_osd;
+ }
+
+ osdev->major = irc;
+
+ rc = osdblk_init_disk(osdev);
+ if (rc)
+ goto err_out_blkdev;
+
+ return 0;
+
+err_out_blkdev:
+ unregister_blkdev(osdev->major, osdev->name);
+err_out_osd:
+ osduld_put_device(osdev->osd);
+err_out_slot:
+ mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
+ osdblk_devs[osdev->id] = NULL;
+ mutex_unlock(&ctl_mutex);
+err_out:
+ kfree(osdev);
+ return rc;
+}
+
+static ssize_t class_osdblk_remove(struct class *c, const char *buf,
+ size_t count)
+{
+ struct osdblk_device *osdev;
+ int target_id;
+
+ if (sscanf(buf, "%d", &target_id) != 1)
+ return -EINVAL;
+ if (target_id < 0 || target_id >= OSDBLK_MAX_DEVS)
+ return -EINVAL;
+
+ mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
+ osdev = osdblk_devs[target_id];
+ osdblk_devs[target_id] = NULL;
+ mutex_unlock(&ctl_mutex);
+
+ if (!osdev)
+ return -ENOENT;
+
+ osdblk_free_disk(osdev);
+ unregister_blkdev(osdev->major, osdev->name);
+ osduld_put_device(osdev->osd);
+ kfree(osdev);
+
+ return 0;
+}
+
+static struct class_attribute class_osdblk_attrs[] = {
+ __ATTR(add, 0200, NULL, class_osdblk_add),
+ __ATTR(remove, 0200, NULL, class_osdblk_remove),
+ __ATTR(list, 0444, class_osdblk_show, NULL),
+ __ATTR_NULL
+};
+
+static int osdblk_sysfs_init(void)
+{
+ int ret = 0;
+
+ /*
+ * create control files in sysfs
+ * /sys/class/osdblk/...
+ */
+ class_osdblk = kzalloc(sizeof(*class_osdblk), GFP_KERNEL);
+ if (!class_osdblk)
+ return -ENOMEM;
+
+ class_osdblk->name = DRV_NAME;
+ class_osdblk->owner = THIS_MODULE;
+ class_osdblk->class_release = class_osdblk_release;
+ class_osdblk->class_attrs = class_osdblk_attrs;
+
+ ret = class_register(class_osdblk);
+ if (ret) {
+ kfree(class_osdblk);
+ class_osdblk = NULL;
+ printk(PFX "failed to create class osdblk\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static void osdblk_sysfs_cleanup(void)
+{
+ if (class_osdblk)
+ class_destroy(class_osdblk);
+ class_osdblk = NULL;
+}
+
+static int __init osdblk_init(void)
+{
+ int rc;
+
+ rc = osdblk_sysfs_init();
+ if (rc)
+ return rc;
+
+ return 0;
+}
+
+static void __exit osdblk_exit(void)
+{
+ osdblk_sysfs_cleanup();
+}
+
+module_init(osdblk_init);
+module_exit(osdblk_exit);
+
--
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