/*
* 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 <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
}
register_with_devfs(cell);
dm_get(md);
+ dm_set_mdptr(md, cell);
up_write(&_hash_lock);
return 0;
list_del(&hc->uuid_list);
list_del(&hc->name_list);
unregister_with_devfs(hc);
+ dm_set_mdptr(hc->md, NULL);
dm_put(hc->md);
if (hc->new_map)
dm_table_put(hc->new_map);
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- * Yes, this will be out of date by the time it gets back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+ * Yes, this will be out of date by the time it gets back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)
{
- return *param->uuid ?
- __get_uuid_cell(param->uuid) : __get_name_cell(param->name);
+ if (*param->uuid)
+ return __get_uuid_cell(param->uuid);
+ else if (*param->name)
+ return __get_name_cell(param->name);
+ else
+ return dm_get_mdptr(huge_decode_dev(param->dev));
}
static inline struct mapped_device *find_device(struct dm_ioctl *param)
hc = __find_device_hash_cell(param);
if (hc) {
md = hc->md;
+ dm_get(md);
/*
* Sneakily write in both the name and the uuid
param->flags |= DM_INACTIVE_PRESENT_FLAG;
else
param->flags &= ~DM_INACTIVE_PRESENT_FLAG;
-
- dm_get(md);
}
up_read(&_hash_lock);
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}
};
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 */
git://git.onelab.eu / linux-2.6.git / blobdiff