The nvm-pages allocator may store and index the NVDIMM pages allocated
for bcache journal. This patch adds the initialization to store bcache
journal space on NVDIMM pages if BCH_FEATURE_INCOMPAT_NVDIMM_META bit is
set by bcache-tools.
If BCH_FEATURE_INCOMPAT_NVDIMM_META is set, get_nvdimm_journal_space()
will return the linear address of NVDIMM pages for bcache journal,
- If there is previously allocated space, find it from nvm-pages owner
list and return to bch_journal_init().
- If there is no previously allocated space, require a new NVDIMM range
from the nvm-pages allocator, and return it to bch_journal_init().
And in bch_journal_init(), keys in sb.d[] store the corresponding linear
address from NVDIMM into sb.d[i].ptr[0] where 'i' is the bucket index to
iterate all journal buckets.
Later when bcache journaling code stores the journaling jset, the target
NVDIMM linear address stored (and updated) in sb.d[i].ptr[0] can be used
directly in memory copy from DRAM pages into NVDIMM pages.
Signed-off-by: Coly Li <colyli@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Jianpeng Ma <jianpeng.ma@xxxxxxxxx>
Cc: Qiaowei Ren <qiaowei.ren@xxxxxxxxx>
---
drivers/md/bcache/journal.c | 117 ++++++++++++++++++++++++++++++++++
drivers/md/bcache/journal.h | 2 +-
drivers/md/bcache/nvm-pages.c | 9 +++
drivers/md/bcache/nvm-pages.h | 1 +
drivers/md/bcache/super.c | 18 +++---
5 files changed, 136 insertions(+), 11 deletions(-)
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index 61bd79babf7a..9fe6c1abfd84 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -9,6 +9,8 @@
#include "btree.h"
#include "debug.h"
#include "extents.h"
+#include "nvm-pages.h"
+#include "features.h"
#include <trace/events/bcache.h>
@@ -982,3 +984,118 @@ int bch_journal_alloc(struct cache_set *c)
return 0;
}
+
+#if defined(CONFIG_BCACHE_NVM_PAGES)
+
+static void *find_journal_nvmpg_base(struct bch_nvmpg_head *nvmpg_head,
+ struct cache *ca)
+{
+ void *addr = NULL;
+ unsigned long jnl_offset, jnl_pgoff, jnl_ns_id;
+ int i;
+
+ jnl_offset = (unsigned long)ca->sb.d[0];
+ jnl_ns_id = BCH_NVMPG_GET_NS_ID(jnl_offset);
+ jnl_pgoff = BCH_NVMPG_GET_OFFSET(jnl_offset) >> PAGE_SHIFT;
+
+ for (i = 0; i < BCH_NVMPG_NS_MAX; i++) {
+ struct bch_nvmpg_recs *recs;
+ struct bch_nvmpg_rec *rec;
+ unsigned long recs_offset = 0;
+ int j;
+
+ recs_offset = nvmpg_head->recs_offset[i];
+ recs = bch_nvmpg_offset_to_ptr(recs_offset);
+ while (recs) {
+ for (j = 0; j < recs->size; j++) {
+ rec = &recs->recs[j];
+ if ((rec->pgoff != jnl_pgoff) ||
+ (rec->ns_id != jnl_ns_id))
+ continue;
+
+ addr = bch_nvmpg_offset_to_ptr(jnl_offset);
+ goto out;
+ }
+ recs_offset = recs->next_offset;
+ recs = bch_nvmpg_offset_to_ptr(recs_offset);
+ }
+ }
+
+out:
+ return addr;
+}
+
+static void *get_journal_nvmpg_space(struct cache *ca)
+{
+ struct bch_nvmpg_head *head = NULL;
+ void *ret = NULL;
+ int order;
+
+ head = bch_get_nvmpg_head(ca->sb.set_uuid);
+ if (head) {
+ ret = find_journal_nvmpg_base(head, ca);
+ if (ret)
+ goto found;
+ }
+
+ order = ilog2((ca->sb.bucket_size *
+ ca->sb.njournal_buckets) / PAGE_SECTORS);
+ ret = bch_nvmpg_alloc_pages(order, ca->sb.set_uuid);
+ if (ret)
+ memset(ret, 0, (1 << order) * PAGE_SIZE);
+found:
+ return ret;
+}
+
+#endif /* CONFIG_BCACHE_NVM_PAGES */
+
+static int __bch_journal_nvdimm_init(struct cache *ca)
+{
+ int ret = -1;
+
+#if defined(CONFIG_BCACHE_NVM_PAGES)
+ int i;
+ void *jnl_base = NULL;
+
+ jnl_base = get_journal_nvmpg_space(ca);
+ if (!jnl_base) {
+ pr_err("Failed to get journal space from nvdimm\n");
+ goto out;
+ }
+
+ /* Iniialized and reloaded from on-disk super block already */
+ if (ca->sb.d[0] != 0)
+ goto out;
+
+ for (i = 0; i < ca->sb.keys; i++) {
+ unsigned long jnl_offset;
+
+ jnl_offset = bch_nvmpg_ptr_to_offset(bch_nvmpg_id_to_ns(0),
+ jnl_base + (bucket_bytes(ca) * i));
+ ca->sb.d[i] = jnl_offset;
+ }
+
+ ret = 0;
+out:
+#endif /* CONFIG_BCACHE_NVM_PAGES */
+
+ return ret;
+}
+
+
+int bch_journal_init(struct cache_set *c)
+{
+ int i, ret = 0;
+ struct cache *ca = c->cache;
+
+ ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7,
+ 2, SB_JOURNAL_BUCKETS);
+
+ if (!bch_has_feature_nvdimm_meta(&ca->sb)) {
+ for (i = 0; i < ca->sb.keys; i++)
+ ca->sb.d[i] = ca->sb.first_bucket + i;
+ } else
+ ret = __bch_journal_nvdimm_init(ca);
+
+ return ret;
+}
diff --git a/drivers/md/bcache/journal.h b/drivers/md/bcache/journal.h
index f2ea34d5f431..e3a7fa5a8fda 100644
--- a/drivers/md/bcache/journal.h
+++ b/drivers/md/bcache/journal.h
@@ -179,7 +179,7 @@ void bch_journal_mark(struct cache_set *c, struct list_head *list);
void bch_journal_meta(struct cache_set *c, struct closure *cl);
int bch_journal_read(struct cache_set *c, struct list_head *list);
int bch_journal_replay(struct cache_set *c, struct list_head *list);
-
+int bch_journal_init(struct cache_set *c);
void bch_journal_free(struct cache_set *c);
int bch_journal_alloc(struct cache_set *c);
diff --git a/drivers/md/bcache/nvm-pages.c b/drivers/md/bcache/nvm-pages.c
index 497360c60f26..55f3f9b7fb0c 100644
--- a/drivers/md/bcache/nvm-pages.c
+++ b/drivers/md/bcache/nvm-pages.c
@@ -24,6 +24,15 @@
struct bch_nvmpg_set *global_nvmpg_set;
+struct bch_nvmpg_ns *bch_nvmpg_id_to_ns(int ns_id)
+{
+ if ((ns_id >= 0) && (ns_id < BCH_NVMPG_NS_MAX))
+ return global_nvmpg_set->ns_tbl[ns_id];
+
+ pr_emerg("Invalid ns_id: %d\n", ns_id);
+ return NULL;
+}
+
void *bch_nvmpg_offset_to_ptr(unsigned long offset)
{
int ns_id = BCH_NVMPG_GET_NS_ID(offset);
diff --git a/drivers/md/bcache/nvm-pages.h b/drivers/md/bcache/nvm-pages.h
index 2f6f2ffbfd80..13cc6a532bda 100644
--- a/drivers/md/bcache/nvm-pages.h
+++ b/drivers/md/bcache/nvm-pages.h
@@ -94,6 +94,7 @@ void bch_nvmpg_exit(void);
void *bch_nvmpg_alloc_pages(int order, const char *uuid);
void bch_nvmpg_free_pages(void *addr, int order, const char *uuid);
struct bch_nvmpg_head *bch_get_nvmpg_head(const char *uuid);
+struct bch_nvmpg_ns *bch_nvmpg_id_to_ns(int ns_id);
#else
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index 4326ffa0d21f..e66e1d6ef260 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -147,9 +147,11 @@ static const char *read_super_common(struct cache_sb *sb, struct block_device *
goto err;
err = "Journal buckets not sequential";
- for (i = 0; i < sb->keys; i++)
- if (sb->d[i] != sb->first_bucket + i)
- goto err;
+ if (!bch_has_feature_nvdimm_meta(sb)) {
+ for (i = 0; i < sb->keys; i++)
+ if (sb->d[i] != sb->first_bucket + i)
+ goto err;
+ }
err = "Too many journal buckets";
if (sb->first_bucket + sb->keys > sb->nbuckets)
@@ -2065,14 +2067,10 @@ static int run_cache_set(struct cache_set *c)
if (bch_journal_replay(c, &journal))
goto err;
} else {
- unsigned int j;
-
pr_notice("invalidating existing data\n");
- ca->sb.keys = clamp_t(int, ca->sb.nbuckets >> 7,
- 2, SB_JOURNAL_BUCKETS);
-
- for (j = 0; j < ca->sb.keys; j++)
- ca->sb.d[j] = ca->sb.first_bucket + j;
+ err = "error initializing journal";
+ if (bch_journal_init(c))
+ goto err;
bch_initial_gc_finish(c);
--
2.26.2
