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Add subsystem, vg_name, lv_name, lv_layer fields to dmsetup reports.

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This commit is contained in:
Alasdair Kergon 2009-06-03 18:35:39 +00:00
parent 2897cfb556
commit 5ec942fb2a
2 changed files with 122 additions and 1 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.33 -
===============================
Add subsystem, vg_name, lv_name, lv_layer fields to dmsetup reports.
Make mempool optional in dm_split_lvm_name().
Version 1.02.32 - 21st May 2009

122
tools/dmsetup.c
View File

@ -141,7 +141,8 @@ typedef enum {
DR_TASK = 1,
DR_INFO = 2,
DR_DEPS = 4,
DR_TREE = 8 /* Complete dependency tree required */
DR_TREE = 8, /* Complete dependency tree required */
DR_NAME = 16
} report_type_t;
static int _switches[NUM_SWITCHES];
@ -256,11 +257,19 @@ static int _parse_file(struct dm_task *dmt, const char *file)
return r;
}
struct dm_split_name {
char *subsystem;
char *vg_name;
char *lv_name;
char *lv_layer;
};
struct dmsetup_report_obj {
struct dm_task *task;
struct dm_info *info;
struct dm_task *deps_task;
struct dm_tree_node *tree_node;
struct dm_split_name *split_name;
};
static struct dm_task *_get_deps_task(int major, int minor)
@ -294,6 +303,64 @@ static struct dm_task *_get_deps_task(int major, int minor)
return NULL;
}
static char *_extract_uuid_prefix(const char *uuid)
{
char *ptr = NULL;
char *uuid_prefix = NULL;
size_t len;
if (uuid)
ptr = strchr(uuid, '-');
len = ptr ? ptr - uuid : 0;
if (!(uuid_prefix = dm_malloc(len + 1))) {
log_error("Failed to allocate memory to extract uuid prefix.");
return NULL;
}
memcpy(uuid_prefix, uuid, len);
uuid_prefix[len] = '\0';
return uuid_prefix;
}
static struct dm_split_name *_get_split_name(const char *uuid, const char *name)
{
struct dm_split_name *split_name;
if (!(split_name = dm_malloc(sizeof(*split_name)))) {
log_error("Failed to allocate memory to split device name "
"into components.");
return NULL;
}
split_name->subsystem = _extract_uuid_prefix(uuid);
split_name->vg_name = split_name->lv_name =
split_name->lv_layer = (char *) "";
if (!strcmp(split_name->subsystem, "LVM") &&
(!(split_name->vg_name = dm_strdup(name)) ||
!dm_split_lvm_name(NULL, NULL, &split_name->vg_name,
&split_name->lv_name, &split_name->lv_layer)))
log_error("Failed to allocate memory to split LVM name "
"into components.");
return split_name;
}
static void _destroy_split_name(struct dm_split_name *split_name)
{
/*
* lv_name and lv_layer are allocated within the same block
* of memory as vg_name so don't need to be freed separately.
*/
if (!strcmp(split_name->subsystem, "LVM"))
dm_free(split_name->vg_name);
dm_free(split_name->subsystem);
dm_free(split_name);
}
static int _display_info_cols(struct dm_task *dmt, struct dm_info *info)
{
struct dmsetup_report_obj obj;
@ -307,6 +374,7 @@ static int _display_info_cols(struct dm_task *dmt, struct dm_info *info)
obj.task = dmt;
obj.info = info;
obj.deps_task = NULL;
obj.split_name = NULL;
if (_report_type & DR_TREE)
obj.tree_node = dm_tree_find_node(_dtree, info->major, info->minor);
@ -314,6 +382,9 @@ static int _display_info_cols(struct dm_task *dmt, struct dm_info *info)
if (_report_type & DR_DEPS)
obj.deps_task = _get_deps_task(info->major, info->minor);
if (_report_type & DR_NAME)
obj.split_name = _get_split_name(dm_task_get_uuid(dmt), dm_task_get_name(dmt));
if (!dm_report_object(_report, &obj))
goto out;
@ -322,6 +393,8 @@ static int _display_info_cols(struct dm_task *dmt, struct dm_info *info)
out:
if (obj.deps_task)
dm_task_destroy(obj.deps_task);
if (obj.split_name)
_destroy_split_name(obj.split_name);
return r;
}
@ -1899,6 +1972,41 @@ static int _dm_deps_disp(struct dm_report *rh, struct dm_pool *mem,
return 0;
}
static int _dm_subsystem_disp(struct dm_report *rh,
struct dm_pool *mem __attribute((unused)),
struct dm_report_field *field, const void *data,
void *private __attribute((unused)))
{
return dm_report_field_string(rh, field, (const char **) data);
}
static int _dm_vg_name_disp(struct dm_report *rh,
struct dm_pool *mem __attribute((unused)),
struct dm_report_field *field, const void *data,
void *private __attribute((unused)))
{
return dm_report_field_string(rh, field, (const char **) data);
}
static int _dm_lv_name_disp(struct dm_report *rh,
struct dm_pool *mem __attribute((unused)),
struct dm_report_field *field, const void *data,
void *private __attribute((unused)))
{
return dm_report_field_string(rh, field, (const char **) data);
}
static int _dm_lv_layer_name_disp(struct dm_report *rh,
struct dm_pool *mem __attribute((unused)),
struct dm_report_field *field, const void *data,
void *private __attribute((unused)))
{
return dm_report_field_string(rh, field, (const char **) data);
}
static void *_task_get_obj(void *obj)
{
return ((struct dmsetup_report_obj *)obj)->task;
@ -1919,11 +2027,17 @@ static void *_tree_get_obj(void *obj)
return ((struct dmsetup_report_obj *)obj)->tree_node;
}
static void *_split_name_get_obj(void *obj)
{
return ((struct dmsetup_report_obj *)obj)->split_name;
}
static const struct dm_report_object_type _report_types[] = {
{ DR_TASK, "Mapped Device Name", "", _task_get_obj },
{ DR_INFO, "Mapped Device Information", "", _info_get_obj },
{ DR_DEPS, "Mapped Device Relationship Information", "", _deps_get_obj },
{ DR_TREE, "Mapped Device Relationship Information", "", _tree_get_obj },
{ DR_NAME, "Mapped Device Name Components", "", _split_name_get_obj },
{ 0, "", "", NULL },
};
@ -1960,6 +2074,12 @@ FIELD_F(DEPS, STR, "DevNos", 6, dm_deps, "devnos_used", "List of device numbers
FIELD_F(TREE, NUM, "#Refs", 5, dm_tree_parents_count, "device_ref_count", "Number of mapped devices referencing this one.")
FIELD_F(TREE, STR, "RefNames", 8, dm_tree_parents_names, "names_using_dev", "List of names of mapped devices using this one.")
FIELD_F(TREE, STR, "RefDevNos", 9, dm_tree_parents_devs, "devnos_using_dev", "List of device numbers of mapped devices using this one.")
FIELD_O(NAME, dm_split_name, STR, "Subsys", subsystem, 6, dm_subsystem, "subsystem", "Userspace subsystem responsible for this device.")
FIELD_O(NAME, dm_split_name, STR, "VG", vg_name, 4, dm_vg_name, "vg_name", "LVM Volume Group name.")
FIELD_O(NAME, dm_split_name, STR, "LV", lv_name, 4, dm_lv_name, "lv_name", "LVM Logical Volume name.")
FIELD_O(NAME, dm_split_name, STR, "LVLayer", lv_layer, 7, dm_lv_layer_name, "lv_layer", "LVM device layer.")
{0, 0, 0, 0, "", "", NULL, NULL},
/* *INDENT-ON* */
};