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label: cache dm dev list earlier

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Cache (when possibly with newer kernel) earlier within label
scanning loop, so the cache information can be also used by
hints file.
This commit is contained in:
Zdenek Kabelac 2024-05-24 20:50:46 +02:00
parent dac2bfe6a4
commit d192477ae6
1 changed files with 22 additions and 24 deletions
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46
lib/label/label.c
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@ -1260,6 +1260,7 @@ int label_scan(struct cmd_context *cmd)
uint64_t max_metadata_size_bytes;
int using_hints;
int create_hints = 0; /* NEWHINTS_NONE */
unsigned devs_features = 0;
log_debug_devs("Finding devices to scan");
@ -1271,6 +1272,15 @@ int label_scan(struct cmd_context *cmd)
if (!label_scan_setup_bcache())
return_0;
/* Initialize device_list cache early so
* 'Hints' file processing can also use it */
dm_device_list_destroy(&cmd->cache_dm_devs);
if (get_device_list(NULL, &cmd->cache_dm_devs, &devs_features))
if (!(devs_features & DM_DEVICE_LIST_HAS_UUID))
/* Using older kernels without UUIDs in LIST,
* -> cannot use cache */
dm_device_list_destroy(&cmd->cache_dm_devs);
/*
* Creates a list of available devices, does not open or read any,
* and does not filter them. The list of all available devices
@ -1661,9 +1671,7 @@ void label_scan_invalidate_lv(struct cmd_context *cmd, struct logical_volume *lv
void label_scan_invalidate_lvs(struct cmd_context *cmd, struct dm_list *lvs)
{
struct dm_list *devs;
struct dm_active_device *dm_dev;
unsigned devs_features = 0;
struct device *dev;
struct lv_list *lvl;
dev_t devt;
@ -1674,30 +1682,20 @@ void label_scan_invalidate_lvs(struct cmd_context *cmd, struct dm_list *lvs)
*/
if (!cmd->scan_lvs)
return;
log_debug("invalidating devs for any pvs on lvs");
if (get_device_list(NULL, &devs, &devs_features)) {
if (devs_features & DM_DEVICE_LIST_HAS_UUID) {
dm_list_iterate_items(dm_dev, devs)
if (dm_dev->uuid &&
strncmp(dm_dev->uuid, UUID_PREFIX, sizeof(UUID_PREFIX) - 1) == 0) {
devt = MKDEV(dm_dev->major, dm_dev->minor);
if ((dev = dev_cache_get_by_devt(cmd, devt)))
label_scan_invalidate(dev);
}
/* ATM no further caching for any lvconvert command
* TODO: any other command to be skipped ??
*/
if (strcmp(cmd->name, "lvconvert")) {
dm_device_list_destroy(&cmd->cache_dm_devs);
cmd->cache_dm_devs = devs; /* cache to avoid unneeded checks */
devs = NULL;
log_debug("Invalidating devs for any PVs on LVs.");
if (cmd->cache_dm_devs) {
dm_list_iterate_items(dm_dev, cmd->cache_dm_devs)
if (dm_dev->uuid &&
strncmp(dm_dev->uuid, UUID_PREFIX, sizeof(UUID_PREFIX) - 1) == 0) {
devt = MKDEV(dm_dev->major, dm_dev->minor);
if ((dev = dev_cache_get_by_devt(cmd, devt)))
label_scan_invalidate(dev);
}
}
dm_device_list_destroy(&devs);
}
if (!(devs_features & DM_DEVICE_LIST_HAS_UUID))
} else
/* With older kernels without UUIDs we have to go the old way
* and check for every LVs UUID one by one */
dm_list_iterate_items(lvl, lvs)
label_scan_invalidate_lv(cmd, lvl->lv);
}