diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/Kconfig | 16 | ||||
| -rw-r--r-- | drivers/block/Makefile | 1 | ||||
| -rw-r--r-- | drivers/block/osdblk.c | 693 |
3 files changed, 0 insertions, 710 deletions
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig index ebe8c1a6195e..f3c2884e05fe 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$M. -config BLK_DEV_OSD - tristate "OSD object-as-blkdev support" - depends on SCSI_OSD_ULD - ---help--- - Saying Y or M here will allow the exporting of a single SCSI - OSD (object-based storage) object as a Linux block device. - - For example, if you create a 2G object on an OSD device, - you can then use this module to present that 2G object as - a Linux block device. - - To compile this driver as a module, choose M here: the - module will be called osdblk. - - If unsure, say N. - config BLK_DEV_SX8 tristate "Promise SATA SX8 support" depends on PCI diff --git a/drivers/block/Makefile b/drivers/block/Makefile index 5ceead8b52d7..ec8c36897b75 100644 --- a/drivers/block/Makefile +++ b/drivers/block/Makefile @@ -21,7 +21,6 @@ obj-$(CONFIG_XILINX_SYSACE) += xsysace.o obj-$(CONFIG_CDROM_PKTCDVD) += pktcdvd.o obj-$(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 <jeff@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); - |