2009-04-10 05:50:45 -06:00
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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 cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
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#include <linux/slab.h>
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2009-04-10 05:50:45 -06:00
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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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2009-05-20 09:50:34 -06:00
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#include <scsi/scsi_device.h>
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2009-04-10 05:50:45 -06:00
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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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2009-09-21 18:01:13 -06:00
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static const struct block_device_operations osdblk_bd_ops = {
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2009-04-10 05:50:45 -06:00
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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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2012-09-06 16:35:02 -06:00
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tmp = bio_clone_kmalloc(old_chain, gfpmask);
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2009-04-10 05:50:45 -06:00
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if (!tmp)
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goto err_out;
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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 */
|
2010-09-03 03:56:16 -06:00
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if (rq->cmd_type != REQ_TYPE_FS) {
|
2009-04-10 05:50:45 -06:00
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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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|
2010-07-03 02:45:35 -06:00
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do_flush = rq->cmd_flags & REQ_FLUSH;
|
2009-04-10 05:50:45 -06:00
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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 */
|
|
|
|
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);
|
|
|
|
if (rc) {
|
|
|
|
blk_cleanup_queue(q);
|
|
|
|
put_disk(disk);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2009-05-20 09:50:34 -06:00
|
|
|
/* 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));
|
|
|
|
|
2009-04-10 05:50:45 -06:00
|
|
|
blk_queue_prep_rq(q, blk_queue_start_tag);
|
2010-09-03 03:56:16 -06:00
|
|
|
blk_queue_flush(q, REQ_FLUSH);
|
2009-04-10 05:50:45 -06:00
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2010-01-05 04:48:07 -07:00
|
|
|
static ssize_t class_osdblk_list(struct class *c,
|
|
|
|
struct class_attribute *attr,
|
|
|
|
char *data)
|
2009-04-10 05:50:45 -06:00
|
|
|
{
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2010-01-05 04:48:07 -07:00
|
|
|
static ssize_t class_osdblk_add(struct class *c,
|
|
|
|
struct class_attribute *attr,
|
|
|
|
const char *buf, size_t count)
|
2009-04-10 05:50:45 -06:00
|
|
|
{
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2010-01-05 04:48:07 -07:00
|
|
|
static ssize_t class_osdblk_remove(struct class *c,
|
|
|
|
struct class_attribute *attr,
|
|
|
|
const char *buf,
|
2009-04-10 05:50:45 -06:00
|
|
|
size_t count)
|
|
|
|
{
|
|
|
|
struct osdblk_device *osdev = NULL;
|
|
|
|
int target_id, rc;
|
|
|
|
unsigned long ul;
|
|
|
|
struct list_head *tmp;
|
|
|
|
|
2013-09-11 15:20:07 -06:00
|
|
|
rc = kstrtoul(buf, 10, &ul);
|
2009-04-10 05:50:45 -06:00
|
|
|
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);
|
|
|
|
|