On 04/12/2017 07:01 PM, Christoph Hellwig wrote:
> This was just a proof of concept user for the SCSI OSD library, and
> never had any real users.
>
> Signed-off-by: Christoph Hellwig <h...@lst.de>
Yes please remove this driver
ACK-by Boaz Harrosh <o...@electrozaur.com>
> ---
> drivers/block/Kconfig | 16 --
> drivers/block/Makefile | 1 -
> drivers/block/osdblk.c | 693
> -------------------------------------------------
> 3 files changed, 710 deletions(-)
> delete mode 100644 drivers/block/osdblk.c
>
> diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
> index a1c2e816128f..58e24c354933 100644
> --- a/drivers/block/Kconfig
> +++ b/drivers/block/Kconfig
> @@ -312,22 +312,6 @@ config BLK_DEV_SKD
>
> Use device /dev/skd$N amd /dev/skd$Np$M.
>
> -config BLK_DEV_OSD
> - tristate "OSD object-as-blkdev support"
> - depends on SCSI_OSD_ULD
> - ---help---
> - Saying Y or M here will allow the exporting of a single SCSI
> - OSD (object-based storage) object as a Linux block device.
> -
> - For example, if you create a 2G object on an OSD device,
> - you can then use this module to present that 2G object as
> - a Linux block device.
> -
> - To compile this driver as a module, choose M here: the
> - module will be called osdblk.
> -
> - If unsure, say N.
> -
> config BLK_DEV_SX8
> tristate "Promise SATA SX8 support"
> depends on PCI
> diff --git a/drivers/block/Makefile b/drivers/block/Makefile
> index b12c772bbeb3..42e8cee1cbc7 100644
> --- a/drivers/block/Makefile
> +++ b/drivers/block/Makefile
> @@ -22,7 +22,6 @@ obj-$(CONFIG_CDROM_PKTCDVD) += pktcdvd.o
> obj-$(CONFIG_MG_DISK) += mg_disk.o
> obj-$(CONFIG_SUNVDC) += sunvdc.o
> obj-$(CONFIG_BLK_DEV_SKD) += skd.o
> -obj-$(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
> deleted file mode 100644
> index 8127b8201a01..000000000000
> --- a/drivers/block/osdblk.c
> +++ /dev/null
> @@ -1,693 +0,0 @@
> -
> -/*
> - 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.
> -
> - In this example, we remove the mapping with blkdev unique id 1.
> -
> - $ 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 <linux/slab.h>
> -#include <scsi/osd_initiator.h>
> -#include <scsi/osd_attributes.h>
> -#include <scsi/osd_sec.h>
> -#include <scsi/scsi_device.h>
> -
> -#define DRV_NAME "osdblk"
> -#define PFX DRV_NAME ": "
> -
> -/* #define _OSDBLK_DEBUG */
> -#ifdef _OSDBLK_DEBUG
> -#define OSDBLK_DEBUG(fmt, a...) \
> - printk(KERN_NOTICE "osdblk @%s:%d: " fmt, __func__, __LINE__, ##a)
> -#else
> -#define OSDBLK_DEBUG(fmt, a...) \
> - do { if (0) printk(fmt, ##a); } while (0)
> -#endif
> -
> -MODULE_AUTHOR("Jeff Garzik <j...@garzik.org>");
> -MODULE_DESCRIPTION("block device inside an OSD object osdblk.ko");
> -MODULE_LICENSE("GPL");
> -
> -struct osdblk_device;
> -
> -enum {
> - OSDBLK_MINORS_PER_MAJOR = 256, /* max minors per blkdev */
> - OSDBLK_MAX_REQ = 32, /* max parallel requests */
> - OSDBLK_OP_TIMEOUT = 4 * 60, /* sync OSD req timeout */
> -};
> -
> -struct osdblk_request {
> - struct request *rq; /* blk layer request */
> - struct bio *bio; /* cloned bio */
> - struct osdblk_device *osdev; /* associated blkdev */
> -};
> -
> -struct osdblk_device {
> - int id; /* blkdev unique id */
> -
> - int major; /* blkdev assigned major */
> - struct gendisk *disk; /* blkdev's gendisk and rq */
> - struct request_queue *q;
> -
> - struct osd_dev *osd; /* associated OSD */
> -
> - char name[32]; /* blkdev name, e.g. osdblk34 */
> -
> - spinlock_t lock; /* queue lock */
> -
> - struct osd_obj_id obj; /* OSD partition, obj id */
> - uint8_t obj_cred[OSD_CAP_LEN]; /* OSD cred */
> -
> - struct osdblk_request req[OSDBLK_MAX_REQ]; /* request table */
> -
> - struct list_head node;
> -
> - char osd_path[0]; /* OSD device path */
> -};
> -
> -static struct class *class_osdblk; /* /sys/class/osdblk */
> -static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown
> */
> -static LIST_HEAD(osdblkdev_list);
> -
> -static const struct block_device_operations osdblk_bd_ops = {
> - .owner = THIS_MODULE,
> -};
> -
> -static const struct osd_attr g_attr_logical_length = ATTR_DEF(
> - OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
> -
> -static void osdblk_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);
> -}
> -
> -/* copied from exofs; move to libosd? */
> -/*
> - * Perform a synchronous OSD operation. copied from exofs; move to libosd?
> - */
> -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. copied from exofs; move to libosd?
> - */
> -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;
> -}
> -
> -/* copied from exofs; move to libosd? */
> -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;
> -
> - /* start request */
> - or = osd_start_request(osdev->osd, GFP_KERNEL);
> - if (!or)
> - return -ENOMEM;
> -
> - /* create a get-attributes(length) request */
> - 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;
> -
> - /* extract length from returned attribute info */
> - 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 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;
> - OSDBLK_DEBUG("osdblk_osd_complete with err=%d\n", ret);
> - }
> -
> - /* complete OSD request */
> - osd_end_request(or);
> -
> - /* complete request passed to osdblk by block layer */
> - __blk_end_request_all(orq->rq, ret);
> -}
> -
> -static void bio_chain_put(struct bio *chain)
> -{
> - struct bio *tmp;
> -
> - while (chain) {
> - tmp = chain;
> - chain = chain->bi_next;
> -
> - bio_put(tmp);
> - }
> -}
> -
> -static struct bio *bio_chain_clone(struct bio *old_chain, gfp_t gfpmask)
> -{
> - struct bio *tmp, *new_chain = NULL, *tail = NULL;
> -
> - while (old_chain) {
> - tmp = bio_clone_kmalloc(old_chain, gfpmask);
> - if (!tmp)
> - goto err_out;
> -
> - tmp->bi_bdev = NULL;
> - gfpmask &= ~__GFP_DIRECT_RECLAIM;
> - tmp->bi_next = NULL;
> -
> - if (!new_chain)
> - new_chain = tail = tmp;
> - else {
> - tail->bi_next = tmp;
> - tail = tmp;
> - }
> -
> - old_chain = old_chain->bi_next;
> - }
> -
> - return new_chain;
> -
> -err_out:
> - OSDBLK_DEBUG("bio_chain_clone with err\n");
> - bio_chain_put(new_chain);
> - return NULL;
> -}
> -
> -static void osdblk_rq_fn(struct request_queue *q)
> -{
> - struct osdblk_device *osdev = q->queuedata;
> -
> - while (1) {
> - struct request *rq;
> - struct osdblk_request *orq;
> - struct osd_request *or;
> - struct bio *bio;
> - bool do_write, do_flush;
> -
> - /* peek at request from block layer */
> - rq = blk_fetch_request(q);
> - if (!rq)
> - break;
> -
> - /* deduce our operation (read, write, flush) */
> - /* I wish the block layer simplified cmd_type/cmd_flags/cmd[]
> - * into a clearly defined set of RPC commands:
> - * read, write, flush, scsi command, power mgmt req,
> - * driver-specific, etc.
> - */
> -
> - do_flush = (req_op(rq) == REQ_OP_FLUSH);
> - do_write = (rq_data_dir(rq) == WRITE);
> -
> - if (!do_flush) { /* osd_flush does not use a bio */
> - /* a bio clone to be passed down to OSD request */
> - bio = bio_chain_clone(rq->bio, GFP_ATOMIC);
> - if (!bio)
> - break;
> - } else
> - bio = NULL;
> -
> - /* alloc internal OSD request, for OSD command execution */
> - or = osd_start_request(osdev->osd, GFP_ATOMIC);
> - if (!or) {
> - bio_chain_put(bio);
> - OSDBLK_DEBUG("osd_start_request with err\n");
> - break;
> - }
> -
> - orq = &osdev->req[rq->tag];
> - orq->rq = rq;
> - orq->bio = bio;
> - orq->osdev = osdev;
> -
> - /* init OSD command: flush, write or read */
> - if (do_flush)
> - osd_req_flush_object(or, &osdev->obj,
> - OSD_CDB_FLUSH_ALL, 0, 0);
> - else if (do_write)
> - osd_req_write(or, &osdev->obj, blk_rq_pos(rq) * 512ULL,
> - bio, blk_rq_bytes(rq));
> - else
> - osd_req_read(or, &osdev->obj, blk_rq_pos(rq) * 512ULL,
> - bio, blk_rq_bytes(rq));
> -
> - OSDBLK_DEBUG("%s 0x%x bytes at 0x%llx\n",
> - do_flush ? "flush" : do_write ?
> - "write" : "read", blk_rq_bytes(rq),
> - blk_rq_pos(rq) * 512ULL);
> -
> - /* begin OSD command execution */
> - if (osd_async_op(or, osdblk_osd_complete, orq,
> - osdev->obj_cred)) {
> - osd_end_request(or);
> - blk_requeue_request(q, rq);
> - bio_chain_put(bio);
> - OSDBLK_DEBUG("osd_execute_request_async with err\n");
> - break;
> - }
> -
> - /* remove the special 'flush' marker, now that the command
> - * is executing
> - */
> - rq->special = NULL;
> - }
> -}
> -
> -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;
> -
> - /* contact OSD, request size info about the object being mapped */
> - rc = osdblk_get_obj_size(osdev, &obj_size);
> - if (rc)
> - return rc;
> -
> - /* create gendisk info */
> - 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;
> -
> - /* init rq */
> - q = blk_init_queue(osdblk_rq_fn, &osdev->lock);
> - if (!q) {
> - put_disk(disk);
> - return -ENOMEM;
> - }
> -
> - /* switch queue to TCQ mode; allocate tag map */
> - rc = blk_queue_init_tags(q, OSDBLK_MAX_REQ, NULL, BLK_TAG_ALLOC_FIFO);
> - if (rc) {
> - blk_cleanup_queue(q);
> - put_disk(disk);
> - return rc;
> - }
> -
> - /* Set our limits to the lower device limits, because osdblk cannot
> - * sleep when allocating a lower-request and therefore cannot be
> - * bouncing.
> - */
> - blk_queue_stack_limits(q, osd_request_queue(osdev->osd));
> -
> - blk_queue_prep_rq(q, blk_queue_start_tag);
> - blk_queue_write_cache(q, true, false);
> -
> - disk->queue = q;
> -
> - q->queuedata = osdev;
> -
> - osdev->disk = disk;
> - osdev->q = q;
> -
> - /* finally, announce the disk to the world */
> - set_capacity(disk, obj_size / 512ULL);
> - add_disk(disk);
> -
> - printk(KERN_INFO "%s: Added of size 0x%llx\n",
> - disk->disk_name, (unsigned long long)obj_size);
> -
> - 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_list(struct class *c,
> - struct class_attribute *attr,
> - char *data)
> -{
> - int n = 0;
> - struct list_head *tmp;
> -
> - mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
> -
> - list_for_each(tmp, &osdblkdev_list) {
> - struct osdblk_device *osdev;
> -
> - osdev = list_entry(tmp, struct osdblk_device, node);
> -
> - n += sprintf(data+n, "%d %d %llu %llu %s\n",
> - osdev->id,
> - osdev->major,
> - osdev->obj.partition,
> - osdev->obj.id,
> - osdev->osd_path);
> - }
> -
> - mutex_unlock(&ctl_mutex);
> - return n;
> -}
> -
> -static ssize_t class_osdblk_add(struct class *c,
> - struct class_attribute *attr,
> - const char *buf, size_t count)
> -{
> - struct osdblk_device *osdev;
> - ssize_t rc;
> - int irc, new_id = 0;
> - struct list_head *tmp;
> -
> - if (!try_module_get(THIS_MODULE))
> - return -ENODEV;
> -
> - /* new osdblk_device object */
> - osdev = kzalloc(sizeof(*osdev) + strlen(buf) + 1, GFP_KERNEL);
> - if (!osdev) {
> - rc = -ENOMEM;
> - goto err_out_mod;
> - }
> -
> - /* static osdblk_device initialization */
> - spin_lock_init(&osdev->lock);
> - INIT_LIST_HEAD(&osdev->node);
> -
> - /* generate unique id: find highest unique id, add one */
> -
> - mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
> -
> - list_for_each(tmp, &osdblkdev_list) {
> - struct osdblk_device *osdev;
> -
> - osdev = list_entry(tmp, struct osdblk_device, node);
> - if (osdev->id > new_id)
> - new_id = osdev->id + 1;
> - }
> -
> - osdev->id = new_id;
> -
> - /* add to global list */
> - list_add_tail(&osdev->node, &osdblkdev_list);
> -
> - mutex_unlock(&ctl_mutex);
> -
> - /* parse add command */
> - if (sscanf(buf, "%llu %llu %s", &osdev->obj.partition, &osdev->obj.id,
> - osdev->osd_path) != 3) {
> - rc = -EINVAL;
> - goto err_out_slot;
> - }
> -
> - /* initialize rest of new object */
> - sprintf(osdev->name, DRV_NAME "%d", osdev->id);
> -
> - /* contact requested OSD */
> - osdev->osd = osduld_path_lookup(osdev->osd_path);
> - if (IS_ERR(osdev->osd)) {
> - rc = PTR_ERR(osdev->osd);
> - goto err_out_slot;
> - }
> -
> - /* build OSD credential */
> - osdblk_make_credential(osdev->obj_cred, &osdev->obj);
> -
> - /* register our block device */
> - irc = register_blkdev(0, osdev->name);
> - if (irc < 0) {
> - rc = irc;
> - goto err_out_osd;
> - }
> -
> - osdev->major = irc;
> -
> - /* set up and announce blkdev mapping */
> - rc = osdblk_init_disk(osdev);
> - if (rc)
> - goto err_out_blkdev;
> -
> - return count;
> -
> -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);
> - list_del_init(&osdev->node);
> - mutex_unlock(&ctl_mutex);
> -
> - kfree(osdev);
> -err_out_mod:
> - OSDBLK_DEBUG("Error adding device %s\n", buf);
> - module_put(THIS_MODULE);
> - return rc;
> -}
> -
> -static ssize_t class_osdblk_remove(struct class *c,
> - struct class_attribute *attr,
> - const char *buf,
> - size_t count)
> -{
> - struct osdblk_device *osdev = NULL;
> - int target_id, rc;
> - unsigned long ul;
> - struct list_head *tmp;
> -
> - rc = kstrtoul(buf, 10, &ul);
> - if (rc)
> - return rc;
> -
> - /* convert to int; abort if we lost anything in the conversion */
> - target_id = (int) ul;
> - if (target_id != ul)
> - return -EINVAL;
> -
> - /* remove object from list immediately */
> - mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
> -
> - list_for_each(tmp, &osdblkdev_list) {
> - osdev = list_entry(tmp, struct osdblk_device, node);
> - if (osdev->id == target_id) {
> - list_del_init(&osdev->node);
> - break;
> - }
> - osdev = NULL;
> - }
> -
> - mutex_unlock(&ctl_mutex);
> -
> - if (!osdev)
> - return -ENOENT;
> -
> - /* clean up and free blkdev and associated OSD connection */
> - osdblk_free_disk(osdev);
> - unregister_blkdev(osdev->major, osdev->name);
> - osduld_put_device(osdev->osd);
> - kfree(osdev);
> -
> - /* release module ref */
> - module_put(THIS_MODULE);
> -
> - return count;
> -}
> -
> -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_list, 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);
> -
>
