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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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bc47df0fa7
call blk_queue_stack_limits() to copy queue limits from the underline osd scsi_device. This is absolutely needed because osdblk cannot sleep when allocating a lower-request and therefore cannot be bouncing. TODO: Dynamic changes of limits to the lower device queue will not reflect in the upper driver Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
702 lines
16 KiB
C
702 lines
16 KiB
C
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/*
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osdblk.c -- Export a single SCSI OSD object as a Linux block device
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Copyright 2009 Red Hat, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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Instructions for use
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--------------------
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1) Map a Linux block device to an existing OSD object.
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In this example, we will use partition id 1234, object id 5678,
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OSD device /dev/osd1.
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$ echo "1234 5678 /dev/osd1" > /sys/class/osdblk/add
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2) List all active blkdev<->object mappings.
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In this example, we have performed step #1 twice, creating two blkdevs,
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mapped to two separate OSD objects.
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$ cat /sys/class/osdblk/list
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0 174 1234 5678 /dev/osd1
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1 179 1994 897123 /dev/osd0
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The columns, in order, are:
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- blkdev unique id
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- blkdev assigned major
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- OSD object partition id
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- OSD object id
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- OSD device
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3) Remove an active blkdev<->object mapping.
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In this example, we remove the mapping with blkdev unique id 1.
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$ echo 1 > /sys/class/osdblk/remove
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NOTE: The actual creation and deletion of OSD objects is outside the scope
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of this driver.
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*/
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <scsi/osd_initiator.h>
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#include <scsi/osd_attributes.h>
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#include <scsi/osd_sec.h>
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#include <scsi/scsi_device.h>
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#define DRV_NAME "osdblk"
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#define PFX DRV_NAME ": "
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/* #define _OSDBLK_DEBUG */
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#ifdef _OSDBLK_DEBUG
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#define OSDBLK_DEBUG(fmt, a...) \
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printk(KERN_NOTICE "osdblk @%s:%d: " fmt, __func__, __LINE__, ##a)
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#else
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#define OSDBLK_DEBUG(fmt, a...) \
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do { if (0) printk(fmt, ##a); } while (0)
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#endif
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MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>");
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MODULE_DESCRIPTION("block device inside an OSD object osdblk.ko");
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MODULE_LICENSE("GPL");
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struct osdblk_device;
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enum {
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OSDBLK_MINORS_PER_MAJOR = 256, /* max minors per blkdev */
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OSDBLK_MAX_REQ = 32, /* max parallel requests */
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OSDBLK_OP_TIMEOUT = 4 * 60, /* sync OSD req timeout */
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};
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struct osdblk_request {
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struct request *rq; /* blk layer request */
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struct bio *bio; /* cloned bio */
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struct osdblk_device *osdev; /* associated blkdev */
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};
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struct osdblk_device {
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int id; /* blkdev unique id */
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int major; /* blkdev assigned major */
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struct gendisk *disk; /* blkdev's gendisk and rq */
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struct request_queue *q;
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struct osd_dev *osd; /* associated OSD */
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char name[32]; /* blkdev name, e.g. osdblk34 */
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spinlock_t lock; /* queue lock */
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struct osd_obj_id obj; /* OSD partition, obj id */
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uint8_t obj_cred[OSD_CAP_LEN]; /* OSD cred */
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struct osdblk_request req[OSDBLK_MAX_REQ]; /* request table */
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struct list_head node;
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char osd_path[0]; /* OSD device path */
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};
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static struct class *class_osdblk; /* /sys/class/osdblk */
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static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */
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static LIST_HEAD(osdblkdev_list);
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static struct block_device_operations osdblk_bd_ops = {
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.owner = THIS_MODULE,
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};
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static const struct osd_attr g_attr_logical_length = ATTR_DEF(
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OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
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static void osdblk_make_credential(u8 cred_a[OSD_CAP_LEN],
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const struct osd_obj_id *obj)
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{
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osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
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}
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/* copied from exofs; move to libosd? */
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/*
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* Perform a synchronous OSD operation. copied from exofs; move to libosd?
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*/
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static int osd_sync_op(struct osd_request *or, int timeout, uint8_t *credential)
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{
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int ret;
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or->timeout = timeout;
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ret = osd_finalize_request(or, 0, credential, NULL);
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if (ret)
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return ret;
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ret = osd_execute_request(or);
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/* osd_req_decode_sense(or, ret); */
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return ret;
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}
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/*
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* Perform an asynchronous OSD operation. copied from exofs; move to libosd?
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*/
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static int osd_async_op(struct osd_request *or, osd_req_done_fn *async_done,
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void *caller_context, u8 *cred)
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{
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int ret;
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ret = osd_finalize_request(or, 0, cred, NULL);
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if (ret)
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return ret;
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ret = osd_execute_request_async(or, async_done, caller_context);
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return ret;
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}
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/* copied from exofs; move to libosd? */
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static int extract_attr_from_req(struct osd_request *or, struct osd_attr *attr)
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{
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struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
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void *iter = NULL;
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int nelem;
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do {
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nelem = 1;
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osd_req_decode_get_attr_list(or, &cur_attr, &nelem, &iter);
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if ((cur_attr.attr_page == attr->attr_page) &&
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(cur_attr.attr_id == attr->attr_id)) {
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attr->len = cur_attr.len;
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attr->val_ptr = cur_attr.val_ptr;
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return 0;
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}
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} while (iter);
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return -EIO;
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}
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static int osdblk_get_obj_size(struct osdblk_device *osdev, u64 *size_out)
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{
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struct osd_request *or;
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struct osd_attr attr;
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int ret;
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/* start request */
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or = osd_start_request(osdev->osd, GFP_KERNEL);
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if (!or)
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return -ENOMEM;
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/* create a get-attributes(length) request */
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osd_req_get_attributes(or, &osdev->obj);
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osd_req_add_get_attr_list(or, &g_attr_logical_length, 1);
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/* execute op synchronously */
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ret = osd_sync_op(or, OSDBLK_OP_TIMEOUT, osdev->obj_cred);
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if (ret)
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goto out;
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/* extract length from returned attribute info */
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attr = g_attr_logical_length;
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ret = extract_attr_from_req(or, &attr);
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if (ret)
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goto out;
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*size_out = get_unaligned_be64(attr.val_ptr);
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out:
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osd_end_request(or);
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return ret;
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}
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static void osdblk_osd_complete(struct osd_request *or, void *private)
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{
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struct osdblk_request *orq = private;
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struct osd_sense_info osi;
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int ret = osd_req_decode_sense(or, &osi);
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if (ret) {
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ret = -EIO;
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OSDBLK_DEBUG("osdblk_osd_complete with err=%d\n", ret);
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}
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/* complete OSD request */
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osd_end_request(or);
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/* complete request passed to osdblk by block layer */
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__blk_end_request_all(orq->rq, ret);
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}
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static void bio_chain_put(struct bio *chain)
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{
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struct bio *tmp;
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while (chain) {
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tmp = chain;
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chain = chain->bi_next;
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bio_put(tmp);
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}
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}
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static struct bio *bio_chain_clone(struct bio *old_chain, gfp_t gfpmask)
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{
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struct bio *tmp, *new_chain = NULL, *tail = NULL;
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while (old_chain) {
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tmp = bio_kmalloc(gfpmask, old_chain->bi_max_vecs);
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if (!tmp)
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goto err_out;
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__bio_clone(tmp, old_chain);
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tmp->bi_bdev = NULL;
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gfpmask &= ~__GFP_WAIT;
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tmp->bi_next = NULL;
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if (!new_chain)
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new_chain = tail = tmp;
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else {
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tail->bi_next = tmp;
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tail = tmp;
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}
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old_chain = old_chain->bi_next;
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}
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return new_chain;
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err_out:
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OSDBLK_DEBUG("bio_chain_clone with err\n");
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bio_chain_put(new_chain);
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return NULL;
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}
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static void osdblk_rq_fn(struct request_queue *q)
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{
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struct osdblk_device *osdev = q->queuedata;
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while (1) {
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struct request *rq;
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struct osdblk_request *orq;
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struct osd_request *or;
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struct bio *bio;
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bool do_write, do_flush;
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/* peek at request from block layer */
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rq = blk_fetch_request(q);
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if (!rq)
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break;
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/* filter out block requests we don't understand */
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if (!blk_fs_request(rq) && !blk_barrier_rq(rq)) {
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blk_end_request_all(rq, 0);
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continue;
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}
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/* deduce our operation (read, write, flush) */
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/* I wish the block layer simplified cmd_type/cmd_flags/cmd[]
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* into a clearly defined set of RPC commands:
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* read, write, flush, scsi command, power mgmt req,
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* driver-specific, etc.
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*/
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do_flush = (rq->special == (void *) 0xdeadbeefUL);
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do_write = (rq_data_dir(rq) == WRITE);
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if (!do_flush) { /* osd_flush does not use a bio */
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/* a bio clone to be passed down to OSD request */
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bio = bio_chain_clone(rq->bio, GFP_ATOMIC);
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if (!bio)
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break;
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} else
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bio = NULL;
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/* alloc internal OSD request, for OSD command execution */
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or = osd_start_request(osdev->osd, GFP_ATOMIC);
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if (!or) {
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bio_chain_put(bio);
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OSDBLK_DEBUG("osd_start_request with err\n");
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break;
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}
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orq = &osdev->req[rq->tag];
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orq->rq = rq;
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orq->bio = bio;
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orq->osdev = osdev;
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/* init OSD command: flush, write or read */
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if (do_flush)
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osd_req_flush_object(or, &osdev->obj,
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OSD_CDB_FLUSH_ALL, 0, 0);
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else if (do_write)
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osd_req_write(or, &osdev->obj, blk_rq_pos(rq) * 512ULL,
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bio, blk_rq_bytes(rq));
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else
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osd_req_read(or, &osdev->obj, blk_rq_pos(rq) * 512ULL,
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bio, blk_rq_bytes(rq));
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OSDBLK_DEBUG("%s 0x%x bytes at 0x%llx\n",
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do_flush ? "flush" : do_write ?
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"write" : "read", blk_rq_bytes(rq),
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blk_rq_pos(rq) * 512ULL);
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/* begin OSD command execution */
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if (osd_async_op(or, osdblk_osd_complete, orq,
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osdev->obj_cred)) {
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osd_end_request(or);
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blk_requeue_request(q, rq);
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bio_chain_put(bio);
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OSDBLK_DEBUG("osd_execute_request_async with err\n");
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break;
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}
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/* remove the special 'flush' marker, now that the command
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* is executing
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*/
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rq->special = NULL;
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}
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}
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static void osdblk_prepare_flush(struct request_queue *q, struct request *rq)
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{
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/* add driver-specific marker, to indicate that this request
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* is a flush command
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*/
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rq->special = (void *) 0xdeadbeefUL;
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}
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static void osdblk_free_disk(struct osdblk_device *osdev)
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{
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struct gendisk *disk = osdev->disk;
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if (!disk)
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return;
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if (disk->flags & GENHD_FL_UP)
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del_gendisk(disk);
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if (disk->queue)
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blk_cleanup_queue(disk->queue);
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put_disk(disk);
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}
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static int osdblk_init_disk(struct osdblk_device *osdev)
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{
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struct gendisk *disk;
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struct request_queue *q;
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int rc;
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u64 obj_size = 0;
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/* contact OSD, request size info about the object being mapped */
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rc = osdblk_get_obj_size(osdev, &obj_size);
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if (rc)
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return rc;
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/* create gendisk info */
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disk = alloc_disk(OSDBLK_MINORS_PER_MAJOR);
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if (!disk)
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return -ENOMEM;
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sprintf(disk->disk_name, DRV_NAME "%d", osdev->id);
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disk->major = osdev->major;
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disk->first_minor = 0;
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disk->fops = &osdblk_bd_ops;
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disk->private_data = osdev;
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/* init rq */
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q = blk_init_queue(osdblk_rq_fn, &osdev->lock);
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if (!q) {
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put_disk(disk);
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return -ENOMEM;
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}
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/* switch queue to TCQ mode; allocate tag map */
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rc = blk_queue_init_tags(q, OSDBLK_MAX_REQ, NULL);
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if (rc) {
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blk_cleanup_queue(q);
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put_disk(disk);
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return rc;
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}
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/* Set our limits to the lower device limits, because osdblk cannot
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* sleep when allocating a lower-request and therefore cannot be
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* bouncing.
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*/
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blk_queue_stack_limits(q, osd_request_queue(osdev->osd));
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blk_queue_prep_rq(q, blk_queue_start_tag);
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blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH, osdblk_prepare_flush);
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disk->queue = q;
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q->queuedata = osdev;
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osdev->disk = disk;
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osdev->q = q;
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/* finally, announce the disk to the world */
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set_capacity(disk, obj_size / 512ULL);
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add_disk(disk);
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printk(KERN_INFO "%s: Added of size 0x%llx\n",
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disk->disk_name, (unsigned long long)obj_size);
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return 0;
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}
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/********************************************************************
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* /sys/class/osdblk/
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* add map OSD object to blkdev
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* remove unmap OSD object
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* list show mappings
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*******************************************************************/
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static void class_osdblk_release(struct class *cls)
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{
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kfree(cls);
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}
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static ssize_t class_osdblk_list(struct class *c, char *data)
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{
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int n = 0;
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struct list_head *tmp;
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mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
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list_for_each(tmp, &osdblkdev_list) {
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struct osdblk_device *osdev;
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osdev = list_entry(tmp, struct osdblk_device, node);
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n += sprintf(data+n, "%d %d %llu %llu %s\n",
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osdev->id,
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osdev->major,
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osdev->obj.partition,
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osdev->obj.id,
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osdev->osd_path);
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}
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mutex_unlock(&ctl_mutex);
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return n;
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}
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static ssize_t class_osdblk_add(struct class *c, const char *buf, size_t count)
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{
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struct osdblk_device *osdev;
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ssize_t rc;
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int irc, new_id = 0;
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struct list_head *tmp;
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if (!try_module_get(THIS_MODULE))
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return -ENODEV;
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/* new osdblk_device object */
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osdev = kzalloc(sizeof(*osdev) + strlen(buf) + 1, GFP_KERNEL);
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if (!osdev) {
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rc = -ENOMEM;
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goto err_out_mod;
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}
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/* static osdblk_device initialization */
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spin_lock_init(&osdev->lock);
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INIT_LIST_HEAD(&osdev->node);
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/* generate unique id: find highest unique id, add one */
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mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
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list_for_each(tmp, &osdblkdev_list) {
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struct osdblk_device *osdev;
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osdev = list_entry(tmp, struct osdblk_device, node);
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|
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, const char *buf,
|
|
size_t count)
|
|
{
|
|
struct osdblk_device *osdev = NULL;
|
|
int target_id, rc;
|
|
unsigned long ul;
|
|
struct list_head *tmp;
|
|
|
|
rc = strict_strtoul(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);
|
|
|