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btrfs: add an api to delete a specific entry from the lru cache

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In order to replace the open coded name cache in send with the lru cache,
we need an API for the lru cache to delete a specific entry for which we
did a previous lookup. This adds the API for it, and a next patch in the
series will use it.

This patch is part of a larger patchset and the changelog of the last
patch in the series contains a sample performance test and results.
The patches that comprise the patchset are the following:

  btrfs: send: directly return from did_overwrite_ref() and simplify it
  btrfs: send: avoid unnecessary generation search at did_overwrite_ref()
  btrfs: send: directly return from will_overwrite_ref() and simplify it
  btrfs: send: avoid extra b+tree searches when checking reference overrides
  btrfs: send: remove send_progress argument from can_rmdir()
  btrfs: send: avoid duplicated orphan dir allocation and initialization
  btrfs: send: avoid unnecessary orphan dir rbtree search at can_rmdir()
  btrfs: send: reduce searches on parent root when checking if dir can be removed
  btrfs: send: iterate waiting dir move rbtree only once when processing refs
  btrfs: send: initialize all the red black trees earlier
  btrfs: send: genericize the backref cache to allow it to be reused
  btrfs: adapt lru cache to allow for 64 bits keys on 32 bits systems
  btrfs: send: cache information about created directories
  btrfs: allow a generation number to be associated with lru cache entries
  btrfs: add an api to delete a specific entry from the lru cache
  btrfs: send: use the lru cache to implement the name cache
  btrfs: send: update size of roots array for backref cache entries
  btrfs: send: cache utimes operations for directories if possible

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2023-01-11 11:36:17 +00:00 committed by David Sterba
parent 0da0c5605e
commit d588adae3b
2 changed files with 14 additions and 4 deletions
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16
fs/btrfs/lru_cache.c
View File

@ -57,8 +57,16 @@ struct btrfs_lru_cache_entry *btrfs_lru_cache_lookup(struct btrfs_lru_cache *cac
return entry;
}
static void delete_entry(struct btrfs_lru_cache *cache,
struct btrfs_lru_cache_entry *entry)
/*
* Remove an entry from the cache.
*
* @cache: The cache to remove from.
* @entry: The entry to remove from the cache.
*
* Note: this also frees the memory used by the entry.
*/
void btrfs_lru_cache_remove(struct btrfs_lru_cache *cache,
struct btrfs_lru_cache_entry *entry)
{
struct list_head *prev = entry->list.prev;
@ -127,7 +135,7 @@ int btrfs_lru_cache_store(struct btrfs_lru_cache *cache,
lru_entry = list_first_entry(&cache->lru_list,
struct btrfs_lru_cache_entry,
lru_list);
delete_entry(cache, lru_entry);
btrfs_lru_cache_remove(cache, lru_entry);
}
list_add_tail(&new_entry->lru_list, &cache->lru_list);
@ -149,7 +157,7 @@ void btrfs_lru_cache_clear(struct btrfs_lru_cache *cache)
struct btrfs_lru_cache_entry *tmp;
list_for_each_entry_safe(entry, tmp, &cache->lru_list, lru_list)
delete_entry(cache, entry);
btrfs_lru_cache_remove(cache, entry);
ASSERT(cache->size == 0);
ASSERT(mtree_empty(&cache->entries));

2
fs/btrfs/lru_cache.h
View File

@ -58,6 +58,8 @@ struct btrfs_lru_cache_entry *btrfs_lru_cache_lookup(struct btrfs_lru_cache *cac
int btrfs_lru_cache_store(struct btrfs_lru_cache *cache,
struct btrfs_lru_cache_entry *new_entry,
gfp_t gfp);
void btrfs_lru_cache_remove(struct btrfs_lru_cache *cache,
struct btrfs_lru_cache_entry *entry);
void btrfs_lru_cache_clear(struct btrfs_lru_cache *cache);
#endif