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Subject[Patch 5/6] dm: list targets cmd
List targets ioctl.  [Patrick Caulfield]
--- diff/drivers/md/dm-crypt.c 2004-02-18 15:16:36.000000000 +0000
+++ source/drivers/md/dm-crypt.c 2004-02-18 15:47:15.000000000 +0000
@@ -720,6 +720,7 @@ static int crypt_status(struct dm_target

static struct target_type crypt_target = {
.name = "crypt",
+ .version= {1, 0, 0},
.module = THIS_MODULE,
.ctr = crypt_ctr,
.dtr = crypt_dtr,
--- diff/drivers/md/dm-ioctl.c 2004-02-18 15:34:04.000000000 +0000
+++ source/drivers/md/dm-ioctl.c 2004-02-18 15:45:30.000000000 +0000
@@ -33,6 +33,14 @@ struct hash_cell {
struct dm_table *new_map;
};

+struct vers_iter {
+ size_t param_size;
+ struct dm_target_versions *vers, *old_vers;
+ char *end;
+ uint32_t flags;
+};
+
+
#define NUM_BUCKETS 64
#define MASK_BUCKETS (NUM_BUCKETS - 1)
static struct list_head _name_buckets[NUM_BUCKETS];
@@ -409,6 +417,80 @@ static int list_devices(struct dm_ioctl
return 0;
}

+static void list_version_get_needed(struct target_type *tt, void *param)
+{
+ int *needed = param;
+
+ *needed += strlen(tt->name);
+ *needed += sizeof(tt->version);
+ *needed += ALIGN_MASK;
+}
+
+static void list_version_get_info(struct target_type *tt, void *param)
+{
+ struct vers_iter *info = param;
+
+ /* Check space - it might have changed since the first iteration */
+ if ((char *)info->vers + sizeof(tt->version) + strlen(tt->name) + 1 >
+ info->end) {
+
+ info->flags = DM_BUFFER_FULL_FLAG;
+ return;
+ }
+
+ if (info->old_vers)
+ info->old_vers->next = (uint32_t) ((void *)info->vers -
+ (void *)info->old_vers);
+ info->vers->version[0] = tt->version[0];
+ info->vers->version[1] = tt->version[1];
+ info->vers->version[2] = tt->version[2];
+ info->vers->next = 0;
+ strcpy(info->vers->name, tt->name);
+
+ info->old_vers = info->vers;
+ info->vers = align_ptr(((void *) ++info->vers) + strlen(tt->name) + 1);
+}
+
+static int list_versions(struct dm_ioctl *param, size_t param_size)
+{
+ size_t len, needed = 0;
+ struct dm_target_versions *vers;
+ struct vers_iter iter_info;
+
+ /*
+ * Loop through all the devices working out how much
+ * space we need.
+ */
+ dm_target_iterate(list_version_get_needed, &needed);
+
+ /*
+ * Grab our output buffer.
+ */
+ vers = get_result_buffer(param, param_size, &len);
+ if (len < needed) {
+ param->flags |= DM_BUFFER_FULL_FLAG;
+ goto out;
+ }
+ param->data_size = param->data_start + needed;
+
+ iter_info.param_size = param_size;
+ iter_info.old_vers = NULL;
+ iter_info.vers = vers;
+ iter_info.flags = 0;
+ iter_info.end = (char *)vers+len;
+
+ /*
+ * Now loop through filling out the names & versions.
+ */
+ dm_target_iterate(list_version_get_info, &iter_info);
+ param->flags |= iter_info.flags;
+
+ out:
+ return 0;
+}
+
+
+
static int check_name(const char *name)
{
if (strchr(name, '/')) {
@@ -1038,7 +1120,9 @@ static ioctl_fn lookup_ioctl(unsigned in
{DM_TABLE_LOAD_CMD, table_load},
{DM_TABLE_CLEAR_CMD, table_clear},
{DM_TABLE_DEPS_CMD, table_deps},
- {DM_TABLE_STATUS_CMD, table_status}
+ {DM_TABLE_STATUS_CMD, table_status},
+
+ {DM_LIST_VERSIONS_CMD, list_versions}
};

return (cmd >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[cmd].fn;
@@ -1112,7 +1196,9 @@ static int validate_params(uint cmd, str
param->flags &= ~DM_BUFFER_FULL_FLAG;

/* Ignores parameters */
- if (cmd == DM_REMOVE_ALL_CMD || cmd == DM_LIST_DEVICES_CMD)
+ if (cmd == DM_REMOVE_ALL_CMD ||
+ cmd == DM_LIST_DEVICES_CMD ||
+ cmd == DM_LIST_VERSIONS_CMD)
return 0;

/* Unless creating, either name or uuid but not both */
--- diff/drivers/md/dm-linear.c 2004-02-18 15:16:23.000000000 +0000
+++ source/drivers/md/dm-linear.c 2004-02-18 15:44:06.000000000 +0000
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2001 Sistina Software (UK) Limited.
+ * Copyright (C) 2001-2003 Sistina Software (UK) Limited.
*
* This file is released under the GPL.
*/
@@ -97,6 +97,7 @@ static int linear_status(struct dm_targe

static struct target_type linear_target = {
.name = "linear",
+ .version= {1, 0, 1},
.module = THIS_MODULE,
.ctr = linear_ctr,
.dtr = linear_dtr,
--- diff/drivers/md/dm-stripe.c 2004-02-18 15:16:23.000000000 +0000
+++ source/drivers/md/dm-stripe.c 2004-02-18 15:44:06.000000000 +0000
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2001 Sistina Software (UK) Limited.
+ * Copyright (C) 2001-2003 Sistina Software (UK) Limited.
*
* This file is released under the GPL.
*/
@@ -212,6 +212,7 @@ static int stripe_status(struct dm_targe

static struct target_type stripe_target = {
.name = "striped",
+ .version= {1, 0, 1},
.module = THIS_MODULE,
.ctr = stripe_ctr,
.dtr = stripe_dtr,
--- diff/drivers/md/dm-target.c 2004-02-18 15:38:06.000000000 +0000
+++ source/drivers/md/dm-target.c 2004-02-18 15:44:06.000000000 +0000
@@ -96,6 +96,20 @@ static struct tt_internal *alloc_target(
return ti;
}

+
+int dm_target_iterate(void (*iter_func)(struct target_type *tt,
+ void *param), void *param)
+{
+ struct tt_internal *ti;
+
+ down_read(&_lock);
+ list_for_each_entry (ti, &_targets, list)
+ iter_func(&ti->tt, param);
+ up_read(&_lock);
+
+ return 0;
+}
+
int dm_register_target(struct target_type *t)
{
int rv = 0;
@@ -161,6 +175,7 @@ static int io_err_map(struct dm_target *

static struct target_type error_target = {
.name = "error",
+ .version = {1, 0, 1},
.ctr = io_err_ctr,
.dtr = io_err_dtr,
.map = io_err_map,
--- diff/drivers/md/dm.h 2004-02-18 15:15:13.000000000 +0000
+++ source/drivers/md/dm.h 2004-02-18 15:44:06.000000000 +0000
@@ -123,6 +123,8 @@ int dm_target_init(void);
void dm_target_exit(void);
struct target_type *dm_get_target_type(const char *name);
void dm_put_target_type(struct target_type *t);
+int dm_target_iterate(void (*iter_func)(struct target_type *tt,
+ void *param), void *param);


/*-----------------------------------------------------------------
--- diff/include/linux/device-mapper.h 2004-02-18 15:16:23.000000000 +0000
+++ source/include/linux/device-mapper.h 2004-02-18 15:44:06.000000000 +0000
@@ -74,6 +74,7 @@ void dm_put_device(struct dm_target *ti,
struct target_type {
const char *name;
struct module *module;
+ unsigned version[3];
dm_ctr_fn ctr;
dm_dtr_fn dtr;
dm_map_fn map;
@@ -104,7 +105,7 @@ struct dm_target {
sector_t split_io;

/*
- * These are automaticall filled in by
+ * These are automatically filled in by
* dm_table_get_device.
*/
struct io_restrictions limits;
--- diff/include/linux/dm-ioctl.h 2003-08-20 14:16:15.000000000 +0100
+++ source/include/linux/dm-ioctl.h 2004-02-18 15:44:17.000000000 +0000
@@ -163,6 +163,16 @@ struct dm_name_list {
};

/*
+ * Used to retrieve the target versions
+ */
+struct dm_target_versions {
+ uint32_t next;
+ uint32_t version[3];
+
+ char name[0];
+};
+
+/*
* If you change this make sure you make the corresponding change
* to dm-ioctl.c:lookup_ioctl()
*/
@@ -185,6 +195,9 @@ enum {
DM_TABLE_CLEAR_CMD,
DM_TABLE_DEPS_CMD,
DM_TABLE_STATUS_CMD,
+
+ /* Added later */
+ DM_LIST_VERSIONS_CMD,
};

#define DM_IOCTL 0xfd
@@ -205,10 +218,12 @@ enum {
#define DM_TABLE_DEPS _IOWR(DM_IOCTL, DM_TABLE_DEPS_CMD, struct dm_ioctl)
#define DM_TABLE_STATUS _IOWR(DM_IOCTL, DM_TABLE_STATUS_CMD, struct dm_ioctl)

+#define DM_LIST_VERSIONS _IOWR(DM_IOCTL, DM_LIST_VERSIONS_CMD, struct dm_ioctl)
+
#define DM_VERSION_MAJOR 4
-#define DM_VERSION_MINOR 0
+#define DM_VERSION_MINOR 1
#define DM_VERSION_PATCHLEVEL 0
-#define DM_VERSION_EXTRA "-ioctl (2003-06-04)"
+#define DM_VERSION_EXTRA "-ioctl (2003-12-10)"

/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
-
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