[RFC PATCH v3 6/8] bcache: get allocated pages from specific owner
From: Qiaowei Ren <hidden>
Date: 2021-01-05 06:43:40
Subsystem:
bcache (block layer cache), the rest · Maintainers:
Coly Li, Kent Overstreet, Linus Torvalds
This patch implements bch_get_allocated_pages() of the buddy to be used to get allocated pages from specific owner. Signed-off-by: Jianpeng Ma <redacted> Signed-off-by: Qiaowei Ren <redacted> --- drivers/md/bcache/nvm-pages.c | 38 +++++++++++++++++++++++++++++++++++ drivers/md/bcache/nvm-pages.h | 6 ++++++ 2 files changed, 44 insertions(+)
diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index e7d948a40662..b095882d3a2b 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c@@ -382,6 +382,44 @@ void *bch_nvm_alloc_pages(int order, const char *owner_uuid) } EXPORT_SYMBOL_GPL(bch_nvm_alloc_pages); +struct bch_extent *bch_get_allocated_pages(const char *owner_uuid) +{ + struct bch_owner_list *owner_list = find_owner_list(owner_uuid, false); + struct bch_nvm_alloced_recs *alloced_recs; + struct bch_extent *head = NULL, *e, *tmp; + int i; + + if (!owner_list) + return NULL; + + for (i = 0; i < only_set->total_namespaces_nr; i++) { + struct list_head *l; + + alloced_recs = owner_list->alloced_recs[i]; + + if (!alloced_recs || alloced_recs->size == 0) + continue; + + l = alloced_recs->extent_head.next; + while (l != &alloced_recs->extent_head) { + e = container_of(l, struct bch_extent, list); + tmp = kzalloc(sizeof(*tmp), GFP_KERNEL|__GFP_NOFAIL); + + tmp->kaddr = e->kaddr; + tmp->nr = e->nr; + + if (head) + list_add_tail(&tmp->list, &head->list); + else + head = tmp; + + l = l->next; + } + } + return head; +} +EXPORT_SYMBOL_GPL(bch_get_allocated_pages); + static int init_owner_info(struct bch_nvm_namespace *ns) { struct bch_owner_list_head *owner_list_head;
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index 05673d129797..27528d146358 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h@@ -79,6 +79,7 @@ int bch_nvm_init(void); void bch_nvm_exit(void); void *bch_nvm_alloc_pages(int order, const char *owner_uuid); void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid); +struct bch_extent *bch_get_allocated_pages(const char *owner_uuid); #else static inline struct bch_nvm_namespace *bch_register_namespace(const char *dev_path)
@@ -98,6 +99,11 @@ static inline void *bch_nvm_alloc_pages(int order, const char *owner_uuid) static inline void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid) { } +static inline struct bch_extent *bch_get_allocated_pages(const char *owner_uuid) +{ + return NULL; +} + #endif /* CONFIG_BCACHE_NVM_PAGES */ #endif /* _BCACHE_NVM_PAGES_H */
--
2.17.1