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NetBSD/sys/dev/dm/device-mapper.c

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/* $NetBSD: device-mapper.c,v 1.22 2010/03/26 15:46:04 jakllsch Exp $ */
/*
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Adam Hamsik.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* I want to say thank you to all people who helped me with this project.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/dkio.h>
#include <sys/disk.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/ioccom.h>
#include <sys/kmem.h>
#include "netbsd-dm.h"
#include "dm.h"
static dev_type_open(dmopen);
static dev_type_close(dmclose);
static dev_type_read(dmread);
static dev_type_write(dmwrite);
static dev_type_ioctl(dmioctl);
static dev_type_strategy(dmstrategy);
static dev_type_size(dmsize);
/* attach and detach routines */
void dmattach(int);
#ifdef _MODULE
static int dmdestroy(void);
#endif
static void dm_doinit(void);
static int dm_cmd_to_fun(prop_dictionary_t);
static int disk_ioctl_switch(dev_t, u_long, void *);
static int dm_ioctl_switch(u_long);
static void dmminphys(struct buf *);
/* CF attach/detach functions used for power management */
static int dm_detach(device_t, int);
static void dm_attach(device_t, device_t, void *);
static int dm_match(device_t, cfdata_t, void *);
/* ***Variable-definitions*** */
const struct bdevsw dm_bdevsw = {
.d_open = dmopen,
.d_close = dmclose,
.d_strategy = dmstrategy,
.d_ioctl = dmioctl,
.d_dump = nodump,
.d_psize = dmsize,
.d_flag = D_DISK | D_MPSAFE
};
const struct cdevsw dm_cdevsw = {
.d_open = dmopen,
.d_close = dmclose,
.d_read = dmread,
.d_write = dmwrite,
.d_ioctl = dmioctl,
.d_stop = nostop,
.d_tty = notty,
.d_poll = nopoll,
.d_mmap = nommap,
.d_kqfilter = nokqfilter,
.d_flag = D_DISK | D_MPSAFE
};
const struct dkdriver dmdkdriver = {
.d_strategy = dmstrategy
};
CFATTACH_DECL3_NEW(dm, 0,
dm_match, dm_attach, dm_detach, NULL, NULL, NULL,
DVF_DETACH_SHUTDOWN);
extern struct cfdriver dm_cd;
extern uint64_t dm_dev_counter;
/*
* This array is used to translate cmd to function pointer.
*
* Interface between libdevmapper and lvm2tools uses different
* names for one IOCTL call because libdevmapper do another thing
* then. When I run "info" or "mknodes" libdevmapper will send same
* ioctl to kernel but will do another things in userspace.
*
*/
struct cmd_function cmd_fn[] = {
{ .cmd = "version", .fn = dm_get_version_ioctl},
{ .cmd = "targets", .fn = dm_list_versions_ioctl},
{ .cmd = "create", .fn = dm_dev_create_ioctl},
{ .cmd = "info", .fn = dm_dev_status_ioctl},
{ .cmd = "mknodes", .fn = dm_dev_status_ioctl},
{ .cmd = "names", .fn = dm_dev_list_ioctl},
{ .cmd = "suspend", .fn = dm_dev_suspend_ioctl},
{ .cmd = "remove", .fn = dm_dev_remove_ioctl},
{ .cmd = "rename", .fn = dm_dev_rename_ioctl},
{ .cmd = "resume", .fn = dm_dev_resume_ioctl},
{ .cmd = "clear", .fn = dm_table_clear_ioctl},
{ .cmd = "deps", .fn = dm_table_deps_ioctl},
{ .cmd = "reload", .fn = dm_table_load_ioctl},
{ .cmd = "status", .fn = dm_table_status_ioctl},
{ .cmd = "table", .fn = dm_table_status_ioctl},
{NULL, NULL}
};
#ifdef _MODULE
#include <sys/module.h>
/* Autoconf defines */
CFDRIVER_DECL(dm, DV_DISK, NULL);
MODULE(MODULE_CLASS_DRIVER, dm, NULL);
/* New module handle routine */
static int
dm_modcmd(modcmd_t cmd, void *arg)
{
int error, bmajor, cmajor;
error = 0;
bmajor = -1;
cmajor = -1;
switch (cmd) {
case MODULE_CMD_INIT:
error = config_cfdriver_attach(&dm_cd);
if (error)
break;
error = config_cfattach_attach(dm_cd.cd_name, &dm_ca);
if (error) {
aprint_error("%s: unable to register cfattach\n",
dm_cd.cd_name);
return error;
}
error = devsw_attach(dm_cd.cd_name, &dm_bdevsw, &bmajor,
&dm_cdevsw, &cmajor);
if (error) {
config_cfattach_detach(dm_cd.cd_name, &dm_ca);
config_cfdriver_detach(&dm_cd);
break;
}
dm_doinit();
break;
case MODULE_CMD_FINI:
/*
* Disable unloading of dm module if there are any devices
* defined in driver. This is probably too strong we need
* to disable auto-unload only if there is mounted dm device
* present.
*/
if (dm_dev_counter > 0)
return EBUSY;
error = dmdestroy();
if (error)
break;
config_cfdriver_detach(&dm_cd);
devsw_detach(&dm_bdevsw, &dm_cdevsw);
break;
case MODULE_CMD_STAT:
return ENOTTY;
default:
return ENOTTY;
}
return error;
}
#endif /* _MODULE */
/*
* dm_match:
*
* Autoconfiguration match function for pseudo-device glue.
*/
static int
dm_match(device_t parent, cfdata_t match,
void *aux)
{
/* Pseudo-device; always present. */
return (1);
}
/*
* dm_attach:
*
* Autoconfiguration attach function for pseudo-device glue.
*/
static void
dm_attach(device_t parent, device_t self,
void *aux)
{
return;
}
/*
* dm_detach:
*
* Autoconfiguration detach function for pseudo-device glue.
* This routine is called by dm_ioctl::dm_dev_remove_ioctl and by autoconf to
* remove devices created in device-mapper.
*/
static int
dm_detach(device_t self, int flags)
{
dm_dev_t *dmv;
/* Detach device from global device list */
if ((dmv = dm_dev_detach(self)) == NULL)
return ENOENT;
/* Destroy active table first. */
dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE);
/* Destroy inactive table if exits, too. */
dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
dm_table_head_destroy(&dmv->table_head);
/* Destroy disk device structure */
disk_detach(dmv->diskp);
disk_destroy(dmv->diskp);
/* Destroy device */
(void)dm_dev_free(dmv);
/* Decrement device counter After removing device */
atomic_dec_64(&dm_dev_counter);
return 0;
}
static void
dm_doinit(void)
{
dm_target_init();
dm_dev_init();
dm_pdev_init();
}
/* attach routine */
void
dmattach(int n)
{
int error;
error = config_cfattach_attach(dm_cd.cd_name, &dm_ca);
if (error) {
aprint_error("%s: unable to register cfattach\n",
dm_cd.cd_name);
} else {
dm_doinit();
}
}
#ifdef _MODULE
/* Destroy routine */
static int
dmdestroy(void)
{
int error;
error = config_cfattach_detach(dm_cd.cd_name, &dm_ca);
if (error)
return error;
dm_dev_destroy();
dm_pdev_destroy();
dm_target_destroy();
return 0;
}
#endif /* _MODULE */
static int
dmopen(dev_t dev, int flags, int mode, struct lwp *l)
{
aprint_debug("dm open routine called %" PRIu32 "\n", minor(dev));
return 0;
}
static int
dmclose(dev_t dev, int flags, int mode, struct lwp *l)
{
aprint_debug("dm close routine called %" PRIu32 "\n", minor(dev));
return 0;
}
static int
dmioctl(dev_t dev, const u_long cmd, void *data, int flag, struct lwp *l)
{
int r;
prop_dictionary_t dm_dict_in;
r = 0;
aprint_debug("dmioctl called\n");
KASSERT(data != NULL);
if (( r = disk_ioctl_switch(dev, cmd, data)) == ENOTTY) {
struct plistref *pref = (struct plistref *) data;
/* Check if we were called with NETBSD_DM_IOCTL ioctl
otherwise quit. */
if ((r = dm_ioctl_switch(cmd)) != 0)
return r;
if((r = prop_dictionary_copyin_ioctl(pref, cmd, &dm_dict_in)) != 0)
return r;
if ((r = dm_check_version(dm_dict_in)) != 0)
goto cleanup_exit;
/* run ioctl routine */
if ((r = dm_cmd_to_fun(dm_dict_in)) != 0)
goto cleanup_exit;
cleanup_exit:
r = prop_dictionary_copyout_ioctl(pref, cmd, dm_dict_in);
prop_object_release(dm_dict_in);
}
return r;
}
/*
* Translate command sent from libdevmapper to func.
*/
static int
dm_cmd_to_fun(prop_dictionary_t dm_dict){
int i, r;
prop_string_t command;
r = 0;
if ((command = prop_dictionary_get(dm_dict, DM_IOCTL_COMMAND)) == NULL)
return EINVAL;
for(i = 0; cmd_fn[i].cmd != NULL; i++)
if (prop_string_equals_cstring(command, cmd_fn[i].cmd))
break;
if (cmd_fn[i].cmd == NULL)
return EINVAL;
aprint_debug("ioctl %s called\n", cmd_fn[i].cmd);
r = cmd_fn[i].fn(dm_dict);
return r;
}
/* Call apropriate ioctl handler function. */
static int
dm_ioctl_switch(u_long cmd)
{
switch(cmd) {
case NETBSD_DM_IOCTL:
aprint_debug("dm NetBSD_DM_IOCTL called\n");
break;
default:
aprint_debug("dm unknown ioctl called\n");
return ENOTTY;
break; /* NOT REACHED */
}
return 0;
}
/*
* Check for disk specific ioctls.
*/
static int
disk_ioctl_switch(dev_t dev, u_long cmd, void *data)
{
dm_dev_t *dmv;
/* disk ioctls make sense only on block devices */
if (minor(dev) == 0)
return ENOTTY;
switch(cmd) {
case DIOCGWEDGEINFO:
{
struct dkwedge_info *dkw = (void *) data;
if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL)
return ENODEV;
aprint_debug("DIOCGWEDGEINFO ioctl called\n");
strlcpy(dkw->dkw_devname, dmv->name, 16);
strlcpy(dkw->dkw_wname, dmv->name, DM_NAME_LEN);
strlcpy(dkw->dkw_parent, dmv->name, 16);
dkw->dkw_offset = 0;
dkw->dkw_size = dm_table_size(&dmv->table_head);
strcpy(dkw->dkw_ptype, DKW_PTYPE_FFS);
dm_dev_unbusy(dmv);
break;
}
case DIOCGDISKINFO:
{
struct plistref *pref = (struct plistref *) data;
if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL)
return ENODEV;
if (dmv->diskp->dk_info == NULL) {
dm_dev_unbusy(dmv);
return ENOTSUP;
} else
prop_dictionary_copyout_ioctl(pref, cmd,
dmv->diskp->dk_info);
dm_dev_unbusy(dmv);
break;
}
default:
aprint_debug("unknown disk_ioctl called\n");
return ENOTTY;
break; /* NOT REACHED */
}
return 0;
}
/*
* Do all IO operations on dm logical devices.
*/
static void
dmstrategy(struct buf *bp)
{
dm_dev_t *dmv;
dm_table_t *tbl;
dm_table_entry_t *table_en;
struct buf *nestbuf;
uint32_t dev_type;
uint64_t buf_start, buf_len, issued_len;
uint64_t table_start, table_end;
uint64_t start, end;
buf_start = bp->b_blkno * DEV_BSIZE;
buf_len = bp->b_bcount;
tbl = NULL;
table_end = 0;
dev_type = 0;
issued_len = 0;
if ((dmv = dm_dev_lookup(NULL, NULL, minor(bp->b_dev))) == NULL) {
bp->b_error = EIO;
bp->b_resid = bp->b_bcount;
biodone(bp);
return;
}
if (bounds_check_with_mediasize(bp, DEV_BSIZE,
dm_table_size(&dmv->table_head)) <= 0) {
dm_dev_unbusy(dmv);
bp->b_resid = bp->b_bcount;
biodone(bp);
return;
}
/*
* disk(9) is part of device structure and it can't be used without
* mutual exclusion, use diskp_mtx until it will be fixed.
*/
mutex_enter(&dmv->diskp_mtx);
disk_busy(dmv->diskp);
mutex_exit(&dmv->diskp_mtx);
/* Select active table */
tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE);
/* Nested buffers count down to zero therefore I have
to set bp->b_resid to maximal value. */
bp->b_resid = bp->b_bcount;
/*
* Find out what tables I want to select.
*/
SLIST_FOREACH(table_en, tbl, next)
{
/* I need need number of bytes not blocks. */
table_start = table_en->start * DEV_BSIZE;
/*
* I have to sub 1 from table_en->length to prevent
* off by one error
*/
table_end = table_start + (table_en->length)* DEV_BSIZE;
start = MAX(table_start, buf_start);
end = MIN(table_end, buf_start + buf_len);
aprint_debug("----------------------------------------\n");
aprint_debug("table_start %010" PRIu64", table_end %010"
PRIu64 "\n", table_start, table_end);
aprint_debug("buf_start %010" PRIu64", buf_len %010"
PRIu64"\n", buf_start, buf_len);
aprint_debug("start-buf_start %010"PRIu64", end %010"
PRIu64"\n", start - buf_start, end);
aprint_debug("start %010" PRIu64" , end %010"
PRIu64"\n", start, end);
aprint_debug("\n----------------------------------------\n");
if (start < end) {
/* create nested buffer */
nestbuf = getiobuf(NULL, true);
nestiobuf_setup(bp, nestbuf, start - buf_start,
(end - start));
issued_len += end - start;
/* I need number of blocks. */
nestbuf->b_blkno = (start - table_start) / DEV_BSIZE;
table_en->target->strategy(table_en, nestbuf);
}
}
if (issued_len < buf_len)
nestiobuf_done(bp, buf_len - issued_len, EINVAL);
mutex_enter(&dmv->diskp_mtx);
disk_unbusy(dmv->diskp, buf_len, bp != NULL ? bp->b_flags & B_READ : 0);
mutex_exit(&dmv->diskp_mtx);
dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE);
dm_dev_unbusy(dmv);
return;
}
static int
dmread(dev_t dev, struct uio *uio, int flag)
{
return (physio(dmstrategy, NULL, dev, B_READ, dmminphys, uio));
}
static int
dmwrite(dev_t dev, struct uio *uio, int flag)
{
return (physio(dmstrategy, NULL, dev, B_WRITE, dmminphys, uio));
}
static int
dmsize(dev_t dev)
{
dm_dev_t *dmv;
uint64_t size;
size = 0;
if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL)
return -ENOENT;
size = dm_table_size(&dmv->table_head);
dm_dev_unbusy(dmv);
return size;
}
static void
dmminphys(struct buf *bp)
{
bp->b_bcount = MIN(bp->b_bcount, MAXPHYS);
}
void
dmgetproperties(struct disk *disk, dm_table_head_t *head)
{
prop_dictionary_t disk_info, odisk_info, geom;
int dmp_size;
dmp_size = dm_table_size(head);
disk_info = prop_dictionary_create();
geom = prop_dictionary_create();
prop_dictionary_set_cstring_nocopy(disk_info, "type", "ESDI");
prop_dictionary_set_uint64(geom, "sectors-per-unit", dmp_size);
prop_dictionary_set_uint32(geom, "sector-size",
DEV_BSIZE /* XXX 512? */);
prop_dictionary_set_uint32(geom, "sectors-per-track", 32);
prop_dictionary_set_uint32(geom, "tracks-per-cylinder", 64);
prop_dictionary_set_uint32(geom, "cylinders-per-unit", dmp_size / 2048);
prop_dictionary_set(disk_info, "geometry", geom);
prop_object_release(geom);
odisk_info = disk->dk_info;
disk->dk_info = disk_info;
if (odisk_info != NULL)
prop_object_release(odisk_info);
}
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