/*
* Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
+ * Copyright (C) 2004 - 2005 Red Hat, Inc. All rights reserved.
*
* This file is released under the GPL.
*/
#include <linux/slab.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/dm-ioctl.h>
+#include <linux/hdreg.h>
#include <asm/uaccess.h>
-#define DM_DRIVER_EMAIL "dm@uk.sistina.com"
+#define DM_DRIVER_EMAIL "dm-devel@redhat.com"
/*-----------------------------------------------------------------
* The ioctl interface needs to be able to look up devices by
unsigned int h = hash_str(str);
list_for_each_entry (hc, _name_buckets + h, name_list)
- if (!strcmp(hc->name, str))
+ if (!strcmp(hc->name, str)) {
+ dm_get(hc->md);
return hc;
+ }
return NULL;
}
unsigned int h = hash_str(str);
list_for_each_entry (hc, _uuid_buckets + h, uuid_list)
- if (!strcmp(hc->uuid, str))
+ if (!strcmp(hc->uuid, str)) {
+ dm_get(hc->md);
return hc;
+ }
return NULL;
}
/*-----------------------------------------------------------------
* Inserting, removing and renaming a device.
*---------------------------------------------------------------*/
-static inline char *kstrdup(const char *str)
-{
- char *r = kmalloc(strlen(str) + 1, GFP_KERNEL);
- if (r)
- strcpy(r, str);
- return r;
-}
-
static struct hash_cell *alloc_cell(const char *name, const char *uuid,
struct mapped_device *md)
{
if (!hc)
return NULL;
- hc->name = kstrdup(name);
+ hc->name = kstrdup(name, GFP_KERNEL);
if (!hc->name) {
kfree(hc);
return NULL;
hc->uuid = NULL;
else {
- hc->uuid = kstrdup(uuid);
+ hc->uuid = kstrdup(uuid, GFP_KERNEL);
if (!hc->uuid) {
kfree(hc->name);
kfree(hc);
*/
static int dm_hash_insert(const char *name, const char *uuid, struct mapped_device *md)
{
- struct hash_cell *cell;
+ struct hash_cell *cell, *hc;
/*
* Allocate the new cells.
* Insert the cell into both hash tables.
*/
down_write(&_hash_lock);
- if (__get_name_cell(name))
+ hc = __get_name_cell(name);
+ if (hc) {
+ dm_put(hc->md);
goto bad;
+ }
list_add(&cell->name_list, _name_buckets + hash_str(name));
if (uuid) {
- if (__get_uuid_cell(uuid)) {
+ hc = __get_uuid_cell(uuid);
+ if (hc) {
list_del(&cell->name_list);
+ dm_put(hc->md);
goto bad;
}
list_add(&cell->uuid_list, _uuid_buckets + hash_str(uuid));
}
register_with_devfs(cell);
dm_get(md);
+ dm_set_mdptr(md, cell);
up_write(&_hash_lock);
return 0;
static void __hash_remove(struct hash_cell *hc)
{
+ struct dm_table *table;
+
/* remove from the dev hash */
list_del(&hc->uuid_list);
list_del(&hc->name_list);
unregister_with_devfs(hc);
- dm_put(hc->md);
+ dm_set_mdptr(hc->md, NULL);
+
+ table = dm_get_table(hc->md);
+ if (table) {
+ dm_table_event(table);
+ dm_table_put(table);
+ }
+
if (hc->new_map)
dm_table_put(hc->new_map);
+ dm_put(hc->md);
free_cell(hc);
}
{
char *new_name, *old_name;
struct hash_cell *hc;
+ struct dm_table *table;
/*
* duplicate new.
*/
- new_name = kstrdup(new);
+ new_name = kstrdup(new, GFP_KERNEL);
if (!new_name)
return -ENOMEM;
if (hc) {
DMWARN("asked to rename to an already existing name %s -> %s",
old, new);
+ dm_put(hc->md);
up_write(&_hash_lock);
kfree(new_name);
return -EBUSY;
/* rename the device node in devfs */
register_with_devfs(hc);
+ /*
+ * Wake up any dm event waiters.
+ */
+ table = dm_get_table(hc->md);
+ if (table) {
+ dm_table_event(table);
+ dm_table_put(table);
+ }
+
+ dm_put(hc->md);
up_write(&_hash_lock);
kfree(old_name);
return 0;
{
size_t *needed = needed_param;
+ *needed += sizeof(struct dm_target_versions);
*needed += strlen(tt->name);
- *needed += sizeof(tt->version);
*needed += ALIGN_MASK;
}
if (dm_suspended(md))
param->flags |= DM_SUSPEND_FLAG;
- bdev = bdget_disk(disk, 0);
- if (!bdev)
- return -ENXIO;
-
param->dev = huge_encode_dev(MKDEV(disk->major, disk->first_minor));
- /*
- * Yes, this will be out of date by the time it gets back
- * to userland, but it is still very useful ofr
- * debugging.
- */
- param->open_count = bdev->bd_openers;
- bdput(bdev);
+ if (!(param->flags & DM_SKIP_BDGET_FLAG)) {
+ bdev = bdget_disk(disk, 0);
+ if (!bdev)
+ return -ENXIO;
+
+ /*
+ * Yes, this will be out of date by the time it gets back
+ * to userland, but it is still very useful for
+ * debugging.
+ */
+ param->open_count = bdev->bd_openers;
+ bdput(bdev);
+ } else
+ param->open_count = -1;
if (disk->policy)
param->flags |= DM_READONLY_FLAG;
}
/*
- * Always use UUID for lookups if it's present, otherwise use name.
+ * Always use UUID for lookups if it's present, otherwise use name or dev.
*/
-static inline struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param)
+static struct hash_cell *__find_device_hash_cell(struct dm_ioctl *param)
{
- return *param->uuid ?
- __get_uuid_cell(param->uuid) : __get_name_cell(param->name);
+ struct mapped_device *md;
+ void *mdptr = NULL;
+
+ if (*param->uuid)
+ return __get_uuid_cell(param->uuid);
+
+ if (*param->name)
+ return __get_name_cell(param->name);
+
+ md = dm_get_md(huge_decode_dev(param->dev));
+ if (md)
+ mdptr = dm_get_mdptr(md);
+
+ return mdptr;
}
-static inline struct mapped_device *find_device(struct dm_ioctl *param)
+static struct mapped_device *find_device(struct dm_ioctl *param)
{
struct hash_cell *hc;
struct mapped_device *md = NULL;
param->flags |= DM_INACTIVE_PRESENT_FLAG;
else
param->flags &= ~DM_INACTIVE_PRESENT_FLAG;
-
- dm_get(md);
}
up_read(&_hash_lock);
static int dev_remove(struct dm_ioctl *param, size_t param_size)
{
struct hash_cell *hc;
+ struct mapped_device *md;
down_write(&_hash_lock);
hc = __find_device_hash_cell(param);
return -ENXIO;
}
+ md = hc->md;
+
__hash_remove(hc);
up_write(&_hash_lock);
+ dm_put(md);
param->data_size = 0;
return 0;
}
return dm_hash_rename(param->name, new_name);
}
+static int dev_set_geometry(struct dm_ioctl *param, size_t param_size)
+{
+ int r = -EINVAL, x;
+ struct mapped_device *md;
+ struct hd_geometry geometry;
+ unsigned long indata[4];
+ char *geostr = (char *) param + param->data_start;
+
+ md = find_device(param);
+ if (!md)
+ return -ENXIO;
+
+ if (geostr < (char *) (param + 1) ||
+ invalid_str(geostr, (void *) param + param_size)) {
+ DMWARN("Invalid geometry supplied.");
+ goto out;
+ }
+
+ x = sscanf(geostr, "%lu %lu %lu %lu", indata,
+ indata + 1, indata + 2, indata + 3);
+
+ if (x != 4) {
+ DMWARN("Unable to interpret geometry settings.");
+ goto out;
+ }
+
+ if (indata[0] > 65535 || indata[1] > 255 ||
+ indata[2] > 255 || indata[3] > ULONG_MAX) {
+ DMWARN("Geometry exceeds range limits.");
+ goto out;
+ }
+
+ geometry.cylinders = indata[0];
+ geometry.heads = indata[1];
+ geometry.sectors = indata[2];
+ geometry.start = indata[3];
+
+ r = dm_set_geometry(md, &geometry);
+ if (!r)
+ r = __dev_status(md, param);
+
+ param->data_size = 0;
+
+out:
+ dm_put(md);
+ return r;
+}
+
static int do_suspend(struct dm_ioctl *param)
{
int r = 0;
+ int do_lockfs = 1;
struct mapped_device *md;
md = find_device(param);
if (!md)
return -ENXIO;
+ if (param->flags & DM_SKIP_LOCKFS_FLAG)
+ do_lockfs = 0;
+
if (!dm_suspended(md))
- r = dm_suspend(md);
+ r = dm_suspend(md, do_lockfs);
if (!r)
r = __dev_status(md, param);
static int do_resume(struct dm_ioctl *param)
{
int r = 0;
+ int do_lockfs = 1;
struct hash_cell *hc;
struct mapped_device *md;
struct dm_table *new_map;
}
md = hc->md;
- dm_get(md);
new_map = hc->new_map;
hc->new_map = NULL;
/* Do we need to load a new map ? */
if (new_map) {
/* Suspend if it isn't already suspended */
+ if (param->flags & DM_SKIP_LOCKFS_FLAG)
+ do_lockfs = 0;
if (!dm_suspended(md))
- dm_suspend(md);
+ dm_suspend(md, do_lockfs);
r = dm_swap_table(md, new_map);
if (r) {
int r;
struct hash_cell *hc;
struct dm_table *t;
+ struct mapped_device *md;
- r = dm_table_create(&t, get_mode(param), param->target_count);
+ md = find_device(param);
+ if (!md)
+ return -ENXIO;
+
+ r = dm_table_create(&t, get_mode(param), param->target_count, md);
if (r)
- return r;
+ goto out;
r = populate_table(t, param, param_size);
if (r) {
dm_table_put(t);
- return r;
+ goto out;
}
down_write(&_hash_lock);
- hc = __find_device_hash_cell(param);
- if (!hc) {
- DMWARN("device doesn't appear to be in the dev hash table.");
+ hc = dm_get_mdptr(md);
+ if (!hc || hc->md != md) {
+ DMWARN("device has been removed from the dev hash table.");
+ dm_table_put(t);
up_write(&_hash_lock);
- return -ENXIO;
+ r = -ENXIO;
+ goto out;
}
if (hc->new_map)
dm_table_put(hc->new_map);
hc->new_map = t;
+ up_write(&_hash_lock);
+
param->flags |= DM_INACTIVE_PRESENT_FLAG;
+ r = __dev_status(md, param);
+
+out:
+ dm_put(md);
- r = __dev_status(hc->md, param);
- up_write(&_hash_lock);
return r;
}
{
int r;
struct hash_cell *hc;
+ struct mapped_device *md;
down_write(&_hash_lock);
param->flags &= ~DM_INACTIVE_PRESENT_FLAG;
r = __dev_status(hc->md, param);
+ md = hc->md;
up_write(&_hash_lock);
+ dm_put(md);
return r;
}
return r;
}
+/*
+ * Pass a message to the target that's at the supplied device offset.
+ */
+static int target_message(struct dm_ioctl *param, size_t param_size)
+{
+ int r, argc;
+ char **argv;
+ struct mapped_device *md;
+ struct dm_table *table;
+ struct dm_target *ti;
+ struct dm_target_msg *tmsg = (void *) param + param->data_start;
+
+ md = find_device(param);
+ if (!md)
+ return -ENXIO;
+
+ r = __dev_status(md, param);
+ if (r)
+ goto out;
+
+ if (tmsg < (struct dm_target_msg *) (param + 1) ||
+ invalid_str(tmsg->message, (void *) param + param_size)) {
+ DMWARN("Invalid target message parameters.");
+ r = -EINVAL;
+ goto out;
+ }
+
+ r = dm_split_args(&argc, &argv, tmsg->message);
+ if (r) {
+ DMWARN("Failed to split target message parameters");
+ goto out;
+ }
+
+ table = dm_get_table(md);
+ if (!table)
+ goto out_argv;
+
+ if (tmsg->sector >= dm_table_get_size(table)) {
+ DMWARN("Target message sector outside device.");
+ r = -EINVAL;
+ goto out_table;
+ }
+
+ ti = dm_table_find_target(table, tmsg->sector);
+ if (ti->type->message)
+ r = ti->type->message(ti, argc, argv);
+ else {
+ DMWARN("Target type does not support messages");
+ r = -EINVAL;
+ }
+
+ out_table:
+ dm_table_put(table);
+ out_argv:
+ kfree(argv);
+ out:
+ param->data_size = 0;
+ dm_put(md);
+ return r;
+}
+
/*-----------------------------------------------------------------
* Implementation of open/close/ioctl on the special char
* device.
{DM_TABLE_DEPS_CMD, table_deps},
{DM_TABLE_STATUS_CMD, table_status},
- {DM_LIST_VERSIONS_CMD, list_versions}
+ {DM_LIST_VERSIONS_CMD, list_versions},
+
+ {DM_TARGET_MSG_CMD, target_message},
+ {DM_DEV_SET_GEOMETRY_CMD, dev_set_geometry}
};
return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn;
cmd == DM_LIST_VERSIONS_CMD)
return 0;
- /* Unless creating, either name or uuid but not both */
- if (cmd != DM_DEV_CREATE_CMD) {
- if ((!*param->uuid && !*param->name) ||
- (*param->uuid && *param->name)) {
- DMWARN("one of name or uuid must be supplied, cmd(%u)",
- cmd);
+ if ((cmd == DM_DEV_CREATE_CMD)) {
+ if (!*param->name) {
+ DMWARN("name not supplied when creating device");
return -EINVAL;
}
+ } else if ((*param->uuid && *param->name)) {
+ DMWARN("only supply one of name or uuid, cmd(%u)", cmd);
+ return -EINVAL;
}
/* Ensure strings are terminated */
* Copy the parameters into kernel space.
*/
r = copy_params(user, ¶m);
- if (r) {
- current->flags &= ~PF_MEMALLOC;
- return r;
- }
- /*
- * FIXME: eventually we will remove the PF_MEMALLOC flag
- * here. However the tools still do nasty things like
- * 'load' while a device is suspended.
- */
+ current->flags &= ~PF_MEMALLOC;
+
+ if (r)
+ return r;
r = validate_params(cmd, param);
if (r)
out:
free_params(param);
- current->flags &= ~PF_MEMALLOC;
return r;
}
git://git.onelab.eu / linux-2.6.git / blobdiff