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Code Releases Activity

dev-cache: unify dm uuid cache struct lifetimes

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The list of dm devs was in the cmd struct and had a
different lifetime than the radix trees referencing
those dm devs.  Now the list and radix trees are
created and destroyed together.
This commit is contained in:
David Teigland 2024-06-28 17:57:00 -05:00
parent 24943fe9d3
commit b8869e2d4e
7 changed files with 48 additions and 43 deletions
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12
lib/activate/dev_manager.c
View File

@ -766,7 +766,7 @@ int dm_device_is_usable(struct cmd_context *cmd, struct device *dev, struct dev_
int only_error_or_zero_target = 1;
int r = 0;
if (cmd->cache_dm_devs &&
if (dev_cache_use_dm_uuid_cache() &&
/* With cache we can avoid status calls for unusable UUIDs */
(dm_dev = dev_cache_get_dm_dev_by_devno(cmd, dev->dev)) &&
!_is_usable_uuid(dev, dm_dev->name, dm_dev->uuid, check.check_reserved, check.check_lv, is_lv))
@ -897,7 +897,7 @@ int devno_dm_uuid(struct cmd_context *cmd, int major, int minor,
const char *uuid;
int r = 0;
if (cmd->cache_dm_devs) {
if (dev_cache_use_dm_uuid_cache()) {
if ((dm_dev = dev_cache_get_dm_dev_by_devno(cmd, MKDEV(major, minor)))) {
dm_strncpy(uuid_buf, dm_dev->uuid, uuid_buf_size);
return 1;
@ -1085,7 +1085,7 @@ int dev_manager_info(struct cmd_context *cmd,
dm_strncpy(old_style_dlid, dlid, sizeof(old_style_dlid));
if (cmd->cache_dm_devs &&
if (dev_cache_use_dm_uuid_cache() &&
!dev_cache_get_dm_dev_by_uuid(cmd, dlid) &&
!dev_cache_get_dm_dev_by_uuid(cmd, old_style_dlid)) {
log_debug("Cached as inactive %s.", name);
@ -2459,7 +2459,7 @@ static int _add_dev_to_dtree(struct dev_manager *dm, struct dm_tree *dtree,
if (!(dlid = build_dm_uuid(dm->track_pending_delete ? dm->cmd->pending_delete_mem : dm->mem, lv, layer)))
return_0;
if (dm->cmd->cache_dm_devs) {
if (dev_cache_use_dm_uuid_cache()) {
if (!(dm_dev = dev_cache_get_dm_dev_by_uuid(dm->cmd, dlid))) {
log_debug("Cached as not present %s.", name);
return 1;
@ -2614,7 +2614,7 @@ static int _pool_callback(struct dm_tree_node *node,
}
}
dm_device_list_destroy(&cmd->cache_dm_devs); /* Cache no longer valid */
dev_cache_destroy_dm_uuids();
log_debug("Running check command on %s", mpath);
@ -3998,7 +3998,7 @@ static int _tree_action(struct dev_manager *dm, const struct logical_volume *lv,
/* Drop any cache before DM table manipulation within locked section
* TODO: check if it makes sense to manage cache within lock */
dm_device_list_destroy(&dm->cmd->cache_dm_devs);
dev_cache_destroy_dm_uuids();
dtree = _create_partial_dtree(dm, lv, laopts->origin_only);

2
lib/commands/toolcontext.c
View File

@ -2038,8 +2038,6 @@ void destroy_toolcontext(struct cmd_context *cmd)
if (cmd->cft_def_hash)
dm_hash_destroy(cmd->cft_def_hash);
dm_device_list_destroy(&cmd->cache_dm_devs);
if (!cmd->running_on_valgrind && cmd->linebuffer) {
int flags;
/* Reset stream buffering to defaults */

2
lib/commands/toolcontext.h
View File

@ -230,8 +230,6 @@ struct cmd_context {
const char *devicesfile; /* from --devicesfile option */
struct dm_list deviceslist; /* from --devices option, struct dm_str_list */
struct dm_list *cache_dm_devs; /* cache with UUIDs from DM_DEVICE_LIST (when available) */
/*
* Configuration.
*/

48
lib/device/dev-cache.c
View File

@ -52,12 +52,14 @@ static struct {
struct radix_tree *names;
struct dm_hash_table *vgid_index;
struct dm_hash_table *lvid_index;
struct radix_tree *dm_uuids;
struct radix_tree *dm_devnos;
struct dm_list *dm_devs; /* dm_active_device structs with dm UUIDs from DM_DEVICE_LIST (when available) */
struct radix_tree *dm_uuids; /* references dm_devs entries */
struct radix_tree *dm_devnos; /* references dm_devs entries */
struct radix_tree *sysfs_only_devices; /* see comments in _get_device_for_sysfs_dev_name_using_devno */
struct radix_tree *devices;
struct dm_regex *preferred_names_matcher;
const char *dev_dir;
int use_dm_uuid_cache;
size_t dev_dir_len;
int has_scanned;
@ -1325,13 +1327,14 @@ out:
return r;
}
int dev_cache_update_dm_devs(struct cmd_context *cmd)
int dev_cache_use_dm_uuid_cache(void)
{
struct dm_active_device *dm_dev;
unsigned devs_features;
uint32_t d;
return _cache.use_dm_uuid_cache;
}
dm_device_list_destroy(&cmd->cache_dm_devs);
void dev_cache_destroy_dm_uuids(void)
{
_cache.use_dm_uuid_cache = 0;
if (_cache.dm_devnos) {
radix_tree_destroy(_cache.dm_devnos);
@ -1343,22 +1346,38 @@ int dev_cache_update_dm_devs(struct cmd_context *cmd)
_cache.dm_uuids = NULL;
}
if (!get_dm_active_devices(NULL, &cmd->cache_dm_devs, &devs_features))
dm_device_list_destroy(&_cache.dm_devs);
}
int dev_cache_update_dm_uuids(void)
{
struct dm_active_device *dm_dev;
unsigned devs_features;
uint32_t d;
dev_cache_destroy_dm_uuids();
if (!get_dm_active_devices(NULL, &_cache.dm_devs, &devs_features))
return 1;
if (!(devs_features & DM_DEVICE_LIST_HAS_UUID)) {
/* Cache unusable with older kernels without UUIDs in LIST */
dm_device_list_destroy(&cmd->cache_dm_devs);
dm_device_list_destroy(&_cache.dm_devs);
return 1;
}
/* _cache.dm_devs entries are referenced by radix trees */
/* TODO: if _cache.dm_devs list is small, then skip the
overhead of radix trees and just do list searches on dm_devs */
if (!(_cache.dm_devnos = radix_tree_create(NULL, NULL)) ||
!(_cache.dm_uuids = radix_tree_create(NULL, NULL))) {
return_0; // FIXME
}
/* Insert every active DM device into radix trees */
dm_list_iterate_items(dm_dev, cmd->cache_dm_devs) {
dm_list_iterate_items(dm_dev, _cache.dm_devs) {
d = _shuffle_devno(dm_dev->devno);
if (!radix_tree_insert_ptr(_cache.dm_devnos, &d, sizeof(d), dm_dev))
@ -1372,6 +1391,7 @@ int dev_cache_update_dm_devs(struct cmd_context *cmd)
//radix_tree_dump(_cache.dm_devnos, stdout);
//radix_tree_dump(_cache.dm_uuids, stdout);
_cache.use_dm_uuid_cache = 1;
return 1;
}
@ -1503,6 +1523,8 @@ int dev_cache_exit(void)
vt.num_open);
}
dev_cache_destroy_dm_uuids();
if (_cache.mem)
dm_pool_destroy(_cache.mem);
@ -1515,12 +1537,6 @@ int dev_cache_exit(void)
if (_cache.lvid_index)
dm_hash_destroy(_cache.lvid_index);
if (_cache.dm_devnos)
radix_tree_destroy(_cache.dm_devnos);
if (_cache.dm_uuids)
radix_tree_destroy(_cache.dm_uuids);
if (_cache.devices)
radix_tree_destroy(_cache.devices);

4
lib/device/dev-cache.h
View File

@ -37,7 +37,9 @@ struct dev_filter {
struct dm_list *dev_cache_get_dev_list_for_vgid(const char *vgid);
struct dm_list *dev_cache_get_dev_list_for_lvid(const char *lvid);
int dev_cache_update_dm_devs(struct cmd_context *cmd);
int dev_cache_use_dm_uuid_cache(void);
int dev_cache_update_dm_uuids(void);
void dev_cache_destroy_dm_uuids(void);
const struct dm_active_device *
dev_cache_get_dm_dev_by_devno(struct cmd_context *cmd, dev_t devno);
const struct dm_active_device *

21
lib/label/label.c
View File

@ -1263,7 +1263,7 @@ int label_scan(struct cmd_context *cmd)
* here, before processing the hints file, so that the dm uuid checks
* in hint processing can benefit from the dm uuid cache.)
*/
if (!dev_cache_update_dm_devs(cmd))
if (!dev_cache_update_dm_uuids())
return_0;
/*
@ -1646,6 +1646,9 @@ void label_scan_invalidate_lv(struct cmd_context *cmd, struct logical_volume *lv
struct device *dev;
dev_t devt;
/* FIXME: use dev_cache_get_existing() with the lv name,
which allow us to skip the getting devno from lv_info. */
if (lv_info(cmd, lv, 0, &lvinfo, 0, 0) && lvinfo.exists) {
/* FIXME: Still unclear what is it supposed to find */
devt = MKDEV(lvinfo.major, lvinfo.minor);
@ -1656,8 +1659,6 @@ 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_active_device *dm_dev;
struct device *dev;
struct lv_list *lvl;
/*
@ -1669,18 +1670,8 @@ void label_scan_invalidate_lvs(struct cmd_context *cmd, struct dm_list *lvs)
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) {
if ((dev = dev_cache_get_by_devt(cmd, dm_dev->devno)))
label_scan_invalidate(dev);
}
} 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);
dm_list_iterate_items(lvl, lvs)
label_scan_invalidate_lv(cmd, lvl->lv);
}
/*

2
lib/locking/locking.c
View File

@ -330,7 +330,7 @@ int vg_write_lock_held(void)
int sync_local_dev_names(struct cmd_context* cmd)
{
dm_device_list_destroy(&cmd->cache_dm_devs);
dev_cache_destroy_dm_uuids();
memlock_unlock(cmd);
fs_unlock();
return 1;