[lvm-devel] main - vdo: read new sysfs path
Zdenek Kabelac
zkabelac at sourceware.org
Thu Sep 9 14:14:21 UTC 2021
Gitweb: https://sourceware.org/git/?p=lvm2.git;a=commitdiff;h=e6f735d411e5911de186a610932c9bb9638275eb
Commit: e6f735d411e5911de186a610932c9bb9638275eb
Parent: 89595a366554191c3df1a18e1f82b79c450a21ad
Author: Zdenek Kabelac <zkabelac at redhat.com>
AuthorDate: Thu Sep 9 14:59:38 2021 +0200
Committer: Zdenek Kabelac <zkabelac at redhat.com>
CommitterDate: Thu Sep 9 15:24:15 2021 +0200
vdo: read new sysfs path
New versions of kvdo module exposes statistics at new location:
/sys/block/dm-XXX/vdo/statistics/...
Enhance lvm2 to access this location first.
Also if the statistic info is missing - make it 'debug' level info,
so it is not failing 'lvs' command.
---
WHATS_NEW | 1 +
lib/activate/dev_manager.c | 7 +++---
lib/metadata/metadata-exported.h | 3 ++-
lib/metadata/vdo_manip.c | 46 ++++++++++++++++++++++------------------
4 files changed, 32 insertions(+), 25 deletions(-)
diff --git a/WHATS_NEW b/WHATS_NEW
index feed7f53d..7d4cea1d6 100644
--- a/WHATS_NEW
+++ b/WHATS_NEW
@@ -1,5 +1,6 @@
Version 2.03.14 -
==================================
+ Support newer location for VDO statistics.
Add support for VDO async-unsage write policy.
Improve lvm_import_vdo script.
Support VDO LV with lvcreate -ky.
diff --git a/lib/activate/dev_manager.c b/lib/activate/dev_manager.c
index 2ada9b525..a8516d661 100644
--- a/lib/activate/dev_manager.c
+++ b/lib/activate/dev_manager.c
@@ -157,6 +157,7 @@ out:
static int _get_segment_status_from_target_params(const char *target_name,
const char *params,
+ const struct dm_info *dminfo,
struct lv_seg_status *seg_status)
{
const struct lv_segment *seg = seg_status->seg;
@@ -216,7 +217,7 @@ static int _get_segment_status_from_target_params(const char *target_name,
return_0;
seg_status->type = SEG_STATUS_SNAPSHOT;
} else if (segtype_is_vdo_pool(segtype)) {
- if (!parse_vdo_pool_status(seg_status->mem, seg->lv, params, &seg_status->vdo_pool))
+ if (!parse_vdo_pool_status(seg_status->mem, seg->lv, params, dminfo, &seg_status->vdo_pool))
return_0;
seg_status->type = SEG_STATUS_VDO_POOL;
} else if (segtype_is_writecache(segtype)) {
@@ -320,7 +321,7 @@ static int _info_run(const char *dlid, struct dm_info *dminfo,
} while (target);
if (!target_name ||
- !_get_segment_status_from_target_params(target_name, target_params, seg_status))
+ !_get_segment_status_from_target_params(target_name, target_params, dminfo, seg_status))
stack;
}
@@ -1886,7 +1887,7 @@ int dev_manager_vdo_pool_status(struct dev_manager *dm,
goto out;
}
- if (!parse_vdo_pool_status(dm->mem, lv, params, *status))
+ if (!parse_vdo_pool_status(dm->mem, lv, params, &info, *status))
goto_out;
(*status)->mem = dm->mem;
diff --git a/lib/metadata/metadata-exported.h b/lib/metadata/metadata-exported.h
index 96a9533d2..7bac5b900 100644
--- a/lib/metadata/metadata-exported.h
+++ b/lib/metadata/metadata-exported.h
@@ -1365,7 +1365,8 @@ const char *get_vdo_write_policy_name(enum dm_vdo_write_policy policy);
uint64_t get_vdo_pool_virtual_size(const struct lv_segment *vdo_pool_seg);
int update_vdo_pool_virtual_size(struct lv_segment *vdo_pool_seg);
int parse_vdo_pool_status(struct dm_pool *mem, const struct logical_volume *vdo_pool_lv,
- const char *params, struct lv_status_vdo *status);
+ const char *params, const struct dm_info *dminfo,
+ struct lv_status_vdo *status);
struct logical_volume *convert_vdo_pool_lv(struct logical_volume *data_lv,
const struct dm_vdo_target_params *vtp,
uint32_t *virtual_extents,
diff --git a/lib/metadata/vdo_manip.c b/lib/metadata/vdo_manip.c
index 673db98e2..fa9c893cb 100644
--- a/lib/metadata/vdo_manip.c
+++ b/lib/metadata/vdo_manip.c
@@ -125,48 +125,56 @@ int update_vdo_pool_virtual_size(struct lv_segment *vdo_pool_seg)
return 1;
}
-static int _sysfs_get_kvdo_value(const char *dm_name, const char *vdo_param, uint64_t *value)
+static int _sysfs_get_kvdo_value(const char *dm_name, const struct dm_info *dminfo,
+ const char *vdo_param, uint64_t *value)
{
char path[PATH_MAX];
char temp[64];
int fd, size, r = 0;
- if (dm_snprintf(path, sizeof(path), "%skvdo/%s/%s",
- dm_sysfs_dir(), dm_name, vdo_param) < 0) {
- log_error("Failed to build kmod path.");
+ if (dm_snprintf(path, sizeof(path), "%s/block/dm-%d/vdo/%s",
+ dm_sysfs_dir(), dminfo->minor, vdo_param) < 0) {
+ log_debug("Failed to build kvdo path.");
return 0;
}
if ((fd = open(path, O_RDONLY)) < 0) {
- if (errno != ENOENT)
- log_sys_error("open", path);
- else
+ /* try with older location */
+ if (dm_snprintf(path, sizeof(path), "%skvdo/%s/%s",
+ dm_sysfs_dir(), dm_name, vdo_param) < 0) {
+ log_debug("Failed to build kvdo path.");
+ return 0;
+ }
+
+ if ((fd = open(path, O_RDONLY)) < 0) {
log_sys_debug("open", path);
- goto bad;
+ goto bad;
+ }
}
if ((size = read(fd, temp, sizeof(temp) - 1)) < 0) {
- log_sys_error("read", path);
+ log_sys_debug("read", path);
goto bad;
}
temp[size] = 0;
errno = 0;
*value = strtoll(temp, NULL, 0);
if (errno) {
- log_sys_error("strtool", path);
+ log_sys_debug("strtool", path);
goto bad;
}
r = 1;
bad:
if (fd >= 0 && close(fd))
- log_sys_error("close", path);
+ log_sys_debug("close", path);
return r;
}
int parse_vdo_pool_status(struct dm_pool *mem, const struct logical_volume *vdo_pool_lv,
- const char *params, struct lv_status_vdo *status)
+ const char *params, const struct dm_info *dminfo,
+ struct lv_status_vdo *status)
{
struct dm_vdo_status_parse_result result;
char *dm_name;
@@ -190,15 +198,11 @@ int parse_vdo_pool_status(struct dm_pool *mem, const struct logical_volume *vdo_
status->vdo = result.status;
- if (result.status->operating_mode == DM_VDO_MODE_NORMAL) {
- if (!_sysfs_get_kvdo_value(dm_name, "statistics/data_blocks_used",
- &status->data_blocks_used))
- return_0;
-
- if (!_sysfs_get_kvdo_value(dm_name, "statistics/logical_blocks_used",
- &status->logical_blocks_used))
- return_0;
-
+ if ((result.status->operating_mode == DM_VDO_MODE_NORMAL) &&
+ _sysfs_get_kvdo_value(dm_name, dminfo, "statistics/data_blocks_used",
+ &status->data_blocks_used) &&
+ _sysfs_get_kvdo_value(dm_name, dminfo, "statistics/logical_blocks_used",
+ &status->logical_blocks_used)) {
status->usage = dm_make_percent(result.status->used_blocks,
result.status->total_blocks);
status->saving = dm_make_percent(status->logical_blocks_used - status->data_blocks_used,
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