From 9767eb448d881f0de9752f39e2873c26a3264955 Mon Sep 17 00:00:00 2001 From: Alasdair Kergon Date: Wed, 3 Jun 2009 18:35:39 +0000 Subject: [PATCH] Add subsystem, vg_name, lv_name, lv_layer fields to dmsetup reports. --- WHATS_NEW_DM | 1 + tools/dmsetup.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 122 insertions(+), 1 deletion(-) diff --git a/WHATS_NEW_DM b/WHATS_NEW_DM index d307cd17e..a36ee92db 100644 --- a/WHATS_NEW_DM +++ b/WHATS_NEW_DM @@ -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 diff --git a/tools/dmsetup.c b/tools/dmsetup.c index 1194c5f6d..f24048ef1 100644 --- a/tools/dmsetup.c +++ b/tools/dmsetup.c @@ -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* */ }; -- 2.43.5