From: Jianpeng Ma <jianpeng.ma@xxxxxxxxx>
This patch implements the bch_nvm_free_pages() of the buddy.
Signed-off-by: Jianpeng Ma <jianpeng.ma@xxxxxxxxx>
Co-authored-by: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
---
drivers/md/bcache/nvm-pages.c | 158 +++++++++++++++++++++++++++++++++-
drivers/md/bcache/nvm-pages.h | 3 +
2 files changed, 157 insertions(+), 4 deletions(-)
diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index c1fefcd27363..c5b1811b201c 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -172,6 +172,155 @@ static void add_pgalloc_rec(struct bch_nvm_pgalloc_recs *recs, void *kaddr, int
BUG_ON(i == recs->size);
}
+static inline void *nvm_end_addr(struct bch_nvm_namespace *ns)
+{
+ return ns->kaddr + (ns->pages_total << PAGE_SHIFT);
+}
+
+static inline bool in_nvm_range(struct bch_nvm_namespace *ns,
+ void *start_addr, void *end_addr)
+{
+ return (start_addr >= ns->kaddr) && (end_addr <= nvm_end_addr(ns));
+}
+
+static struct bch_nvm_namespace *find_nvm_by_addr(void *addr, int order)
+{
+ int i;
+ struct bch_nvm_namespace *ns;
+
+ for (i = 0; i < only_set->total_namespaces_nr; i++) {
+ ns = only_set->nss[i];
+ if (ns && in_nvm_range(ns, addr, addr + (1 << order)))
+ return ns;
+ }
+ return NULL;
+}
+
+static int remove_pgalloc_rec(struct bch_nvm_pgalloc_recs *pgalloc_recs, int ns_nr,
+ void *kaddr, int order)
+{
+ struct bch_nvm_pages_owner_head *owner_head = pgalloc_recs->owner;
+ struct bch_nvm_pgalloc_recs *prev_recs, *sys_recs;
+ u64 pgoff = (unsigned long)kaddr >> PAGE_SHIFT;
+ struct bch_nvm_namespace *ns = only_set->nss[0];
+ int i;
+
+ prev_recs = pgalloc_recs;
+ sys_recs = ns->kaddr + BCH_NVM_PAGES_SYS_RECS_HEAD_OFFSET;
+ while (pgalloc_recs) {
+ for (i = 0; i < pgalloc_recs->size; i++) {
+ struct bch_pgalloc_rec *rec = &(pgalloc_recs->recs[i]);
+
+ if (rec->pgoff == pgoff) {
+ WARN_ON(rec->order != order);
+ rec->pgoff = 0;
+ rec->order = 0;
+ pgalloc_recs->used--;
+
+ if (pgalloc_recs->used == 0) {
+ int recs_pos = pgalloc_recs - sys_recs;
+
+ if (pgalloc_recs == prev_recs)
+ owner_head->recs[ns_nr] = pgalloc_recs->next;
+ else
+ prev_recs->next = pgalloc_recs->next;
+
+ pgalloc_recs->next = NULL;
+ pgalloc_recs->owner = NULL;
+
+ bitmap_clear(ns->pgalloc_recs_bitmap, recs_pos, 1);
+ }
+ goto exit;
+ }
+ }
+ prev_recs = pgalloc_recs;
+ pgalloc_recs = pgalloc_recs->next;
+ }
+exit:
+ return pgalloc_recs ? 0 : -ENOENT;
+}
+
+static void __free_space(struct bch_nvm_namespace *ns, void *addr, int order)
+{
+ unsigned int add_pages = (1 << order);
+ pgoff_t pgoff;
+ struct page *page;
+
+ page = nvm_vaddr_to_page(ns, addr);
+ WARN_ON((!page) || (page->private != order));
+ pgoff = page->index;
+
+ while (order < BCH_MAX_ORDER - 1) {
+ struct page *buddy_page;
+
+ pgoff_t buddy_pgoff = pgoff ^ (1 << order);
+ pgoff_t parent_pgoff = pgoff & ~(1 << order);
+
+ if ((parent_pgoff + (1 << (order + 1)) > ns->pages_total))
+ break;
+
+ buddy_page = nvm_vaddr_to_page(ns, nvm_pgoff_to_vaddr(ns, buddy_pgoff));
+ WARN_ON(!buddy_page);
+
+ if (PageBuddy(buddy_page) && (buddy_page->private == order)) {
+ list_del((struct list_head *)&buddy_page->zone_device_data);
+ __ClearPageBuddy(buddy_page);
+ pgoff = parent_pgoff;
+ order++;
+ continue;
+ }
+ break;
+ }
+
+ page = nvm_vaddr_to_page(ns, nvm_pgoff_to_vaddr(ns, pgoff));
+ WARN_ON(!page);
+ list_add((struct list_head *)&page->zone_device_data, &ns->free_area[order]);
+ page->index = pgoff;
+ set_page_private(page, order);
+ __SetPageBuddy(page);
+ ns->free += add_pages;
+}
+
+void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid)
+{
+ struct bch_nvm_namespace *ns;
+ struct bch_nvm_pages_owner_head *owner_head;
+ struct bch_nvm_pgalloc_recs *pgalloc_recs;
+ int r;
+
+ mutex_lock(&only_set->lock);
+
+ ns = find_nvm_by_addr(addr, order);
+ if (!ns) {
+ pr_info("can't find nvm_dev by kaddr %p\n", addr);
+ goto unlock;
+ }
+
+ owner_head = find_owner_head(owner_uuid, false);
+ if (!owner_head) {
+ pr_info("can't found bch_nvm_pages_owner_head by(uuid=%s)\n", owner_uuid);
+ goto unlock;
+ }
+
+ pgalloc_recs = find_nvm_pgalloc_recs(ns, owner_head, false);
+ if (!pgalloc_recs) {
+ pr_info("can't find bch_nvm_pgalloc_recs by(uuid=%s)\n", owner_uuid);
+ goto unlock;
+ }
+
+ r = remove_pgalloc_rec(pgalloc_recs, ns->sb->this_namespace_nr, addr, order);
+ if (r < 0) {
+ pr_info("can't find bch_pgalloc_rec\n");
+ goto unlock;
+ }
+
+ __free_space(ns, addr, order);
+
+unlock:
+ mutex_unlock(&only_set->lock);
+}
+EXPORT_SYMBOL_GPL(bch_nvm_free_pages);
+
void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
{
void *kaddr = NULL;
@@ -308,7 +457,7 @@ static void init_nvm_free_space(struct bch_nvm_namespace *ns)
{
unsigned int start, end, i;
struct page *page;
- long long pages;
+ u64 pages;
pgoff_t pgoff_start;
bitmap_for_each_clear_region(ns->pages_bitmap, start, end, 0, ns->pages_total) {
@@ -324,8 +473,9 @@ static void init_nvm_free_space(struct bch_nvm_namespace *ns)
page = nvm_vaddr_to_page(ns, nvm_pgoff_to_vaddr(ns, pgoff_start));
page->index = pgoff_start;
set_page_private(page, i);
- __SetPageBuddy(page);
- list_add((struct list_head *)&page->zone_device_data, &ns->free_area[i]);
+
+ /* in order to update ns->free */
+ __free_space(ns, nvm_pgoff_to_vaddr(ns, pgoff_start), i);
pgoff_start += 1 << i;
pages -= 1 << i;
@@ -505,7 +655,7 @@ struct bch_nvm_namespace *bch_register_namespace(const char *dev_path)
ns->page_size = ns->sb->page_size;
ns->pages_offset = ns->sb->pages_offset;
ns->pages_total = ns->sb->pages_total;
- ns->free = 0;
+ ns->free = 0; /* increase by __free_space() */
ns->bdev = bdev;
ns->nvm_set = only_set;
mutex_init(&ns->lock);
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index b2c0e0cfac20..4ea831894583 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -61,6 +61,7 @@ struct bch_nvm_namespace *bch_register_namespace(const char *dev_path);
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);
#else
@@ -78,6 +79,8 @@ static inline void *bch_nvm_alloc_pages(int order, const char *owner_uuid)
return NULL;
}
+static inline void bch_nvm_free_pages(void *addr, int order, const char *owner_uuid) { }
+
#endif /* CONFIG_BCACHE_NVM_PAGES */
#endif /* _BCACHE_NVM_PAGES_H */
--
2.25.1
