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dm vdo: add dmsetup message for returning configuration info

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Add a new dmsetup message called config, which will return
useful configuration information for the vdo volume and
the uds index associated with it. The output is a YAML
string, and contains a version number to allow future
additions to the content.

Signed-off-by: Bruce Johnston <bjohnsto@redhat.com>
Signed-off-by: Matthew Sakai <msakai@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
This commit is contained in:
Bruce Johnston 2024-07-18 14:02:38 -04:00 committed by Mikulas Patocka
parent 3a59b2ec24
commit 47874c98dc
4 changed files with 59 additions and 2 deletions
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7
Documentation/admin-guide/device-mapper/vdo.rst
View File

@ -251,7 +251,12 @@ The messages are:
by the vdostats userspace program to interpret the output
buffer.
dump:
config:
Outputs useful vdo configuration information. Mostly used
by users who want to recreate a similar VDO volume and
want to know the creation configuration used.
dump:
Dumps many internal structures to the system log. This is
not always safe to run, so it should only be used to debug
a hung vdo. Optional parameters to specify structures to

5
drivers/md/dm-vdo/dm-vdo-target.c
View File

@ -1105,6 +1105,9 @@ static int vdo_message(struct dm_target *ti, unsigned int argc, char **argv,
if ((argc == 1) && (strcasecmp(argv[0], "stats") == 0)) {
vdo_write_stats(vdo, result_buffer, maxlen);
result = 1;
} else if ((argc == 1) && (strcasecmp(argv[0], "config") == 0)) {
vdo_write_config(vdo, &result_buffer, &maxlen);
result = 1;
} else {
result = vdo_status_to_errno(process_vdo_message(vdo, argc, argv));
}
@ -2832,7 +2835,7 @@ static void vdo_resume(struct dm_target *ti)
static struct target_type vdo_target_bio = {
.features = DM_TARGET_SINGLETON,
.name = "vdo",
.version = { 9, 0, 0 },
.version = { 9, 1, 0 },
.module = THIS_MODULE,
.ctr = vdo_ctr,
.dtr = vdo_dtr,

48
drivers/md/dm-vdo/message-stats.c
View File

@ -4,6 +4,7 @@
*/
#include "dedupe.h"
#include "indexer.h"
#include "logger.h"
#include "memory-alloc.h"
#include "message-stats.h"
@ -430,3 +431,50 @@ int vdo_write_stats(struct vdo *vdo, char *buf, unsigned int maxlen)
vdo_free(stats);
return VDO_SUCCESS;
}
static void write_index_memory(u32 mem, char **buf, unsigned int *maxlen)
{
char *prefix = "memorySize : ";
/* Convert index memory to fractional value */
if (mem == (u32)UDS_MEMORY_CONFIG_256MB)
write_string(prefix, "0.25, ", NULL, buf, maxlen);
else if (mem == (u32)UDS_MEMORY_CONFIG_512MB)
write_string(prefix, "0.50, ", NULL, buf, maxlen);
else if (mem == (u32)UDS_MEMORY_CONFIG_768MB)
write_string(prefix, "0.75, ", NULL, buf, maxlen);
else
write_u32(prefix, mem, ", ", buf, maxlen);
}
static void write_index_config(struct index_config *config, char **buf,
unsigned int *maxlen)
{
write_string("index : ", "{ ", NULL, buf, maxlen);
/* index mem size */
write_index_memory(config->mem, buf, maxlen);
/* whether the index is sparse or not */
write_bool("isSparse : ", config->sparse, ", ", buf, maxlen);
write_string(NULL, "}", ", ", buf, maxlen);
}
int vdo_write_config(struct vdo *vdo, char **buf, unsigned int *maxlen)
{
struct vdo_config *config = &vdo->states.vdo.config;
write_string(NULL, "{ ", NULL, buf, maxlen);
/* version */
write_u32("version : ", 1, ", ", buf, maxlen);
/* physical size */
write_block_count_t("physicalSize : ", config->physical_blocks * VDO_BLOCK_SIZE, ", ",
buf, maxlen);
/* logical size */
write_block_count_t("logicalSize : ", config->logical_blocks * VDO_BLOCK_SIZE, ", ",
buf, maxlen);
/* slab size */
write_block_count_t("slabSize : ", config->slab_size, ", ", buf, maxlen);
/* index config */
write_index_config(&vdo->geometry.index_config, buf, maxlen);
write_string(NULL, "}", NULL, buf, maxlen);
return VDO_SUCCESS;
}

1
drivers/md/dm-vdo/message-stats.h
View File

@ -8,6 +8,7 @@
#include "types.h"
int vdo_write_config(struct vdo *vdo, char **buf, unsigned int *maxlen);
int vdo_write_stats(struct vdo *vdo, char *buf, unsigned int maxlen);
#endif /* VDO_MESSAGE_STATS_H */