@@ -619,6 +619,7 @@ struct btrfs_block_group_cache {
*/
u64 alloc_offset;
struct mutex zone_io_lock;
+ u64 meta_write_pointer;
};
/* delayed seq elem */
@@ -1105,6 +1106,8 @@ struct btrfs_fs_info {
spinlock_t ref_verify_lock;
struct rb_root block_tree;
#endif
+
+ struct mutex hmzoned_meta_io_lock;
};
static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
@@ -2701,6 +2701,7 @@ int open_ctree(struct super_block *sb,
mutex_init(&fs_info->delete_unused_bgs_mutex);
mutex_init(&fs_info->reloc_mutex);
mutex_init(&fs_info->delalloc_root_mutex);
+ mutex_init(&fs_info->hmzoned_meta_io_lock);
seqlock_init(&fs_info->profiles_lock);
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
@@ -3892,7 +3892,9 @@ int btree_write_cache_pages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree;
+ struct btrfs_fs_info *fs_info = tree->fs_info;
struct extent_buffer *eb, *prev_eb = NULL;
+ struct btrfs_block_group_cache *cache = NULL;
struct extent_page_data epd = {
.bio = NULL,
.tree = tree,
@@ -3922,6 +3924,7 @@ int btree_write_cache_pages(struct address_space *mapping,
tag = PAGECACHE_TAG_TOWRITE;
else
tag = PAGECACHE_TAG_DIRTY;
+ btrfs_hmzoned_meta_io_lock(fs_info);
retry:
if (wbc->sync_mode == WB_SYNC_ALL)
tag_pages_for_writeback(mapping, index, end);
@@ -3965,6 +3968,14 @@ int btree_write_cache_pages(struct address_space *mapping,
if (!ret)
continue;
+ if (!btrfs_check_meta_write_pointer(fs_info, eb,
+ &cache)) {
+ ret = 0;
+ done = 1;
+ free_extent_buffer(eb);
+ break;
+ }
+
prev_eb = eb;
ret = lock_extent_buffer_for_io(eb, &epd);
if (!ret) {
@@ -3999,12 +4010,16 @@ int btree_write_cache_pages(struct address_space *mapping,
index = 0;
goto retry;
}
+ if (cache)
+ btrfs_put_block_group(cache);
ASSERT(ret <= 0);
if (ret < 0) {
end_write_bio(&epd, ret);
- return ret;
+ goto out;
}
ret = flush_write_bio(&epd);
+out:
+ btrfs_hmzoned_meta_io_unlock(fs_info);
return ret;
}
@@ -545,6 +545,9 @@ int btrfs_load_block_group_zone_info(struct btrfs_block_group_cache *cache)
out:
cache->alloc_type = alloc_type;
+ if (!ret)
+ cache->meta_write_pointer =
+ cache->alloc_offset + cache->key.objectid;
kfree(alloc_offsets);
free_extent_map(em);
@@ -648,3 +651,45 @@ void btrfs_free_redirty_list(struct btrfs_transaction *trans)
}
spin_unlock(&trans->releasing_ebs_lock);
}
+
+bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb,
+ struct btrfs_block_group_cache **cache_ret)
+{
+ struct btrfs_block_group_cache *cache;
+
+ if (!btrfs_fs_incompat(fs_info, HMZONED))
+ return true;
+
+ cache = *cache_ret;
+
+ if (cache &&
+ (eb->start < cache->key.objectid ||
+ cache->key.objectid + cache->key.offset <= eb->start)) {
+ btrfs_put_block_group(cache);
+ cache = NULL;
+ *cache_ret = NULL;
+ }
+
+ if (!cache)
+ cache = btrfs_lookup_block_group(fs_info,
+ eb->start);
+
+ if (cache) {
+ *cache_ret = cache;
+
+ if (cache->alloc_type != BTRFS_ALLOC_SEQ)
+ return true;
+
+ if (cache->meta_write_pointer != eb->start) {
+ btrfs_put_block_group(cache);
+ cache = NULL;
+ *cache_ret = NULL;
+ return false;
+ }
+
+ cache->meta_write_pointer = eb->start + eb->len;
+ }
+
+ return true;
+}
@@ -40,6 +40,9 @@ void btrfs_redirty_list_add(struct btrfs_transaction *trans,
struct extent_buffer *eb);
void btrfs_free_redirty_list(struct btrfs_transaction *trans);
void btrfs_hmzoned_data_io_unlock_at(struct inode *inode, u64 start, u64 len);
+bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *eb,
+ struct btrfs_block_group_cache **cache_ret);
static inline bool btrfs_dev_is_sequential(struct btrfs_device *device, u64 pos)
{
@@ -174,4 +177,18 @@ static inline void btrfs_hmzoned_data_io_unlock_logical(
btrfs_put_block_group(cache);
}
+static inline void btrfs_hmzoned_meta_io_lock(struct btrfs_fs_info *fs_info)
+{
+ if (!btrfs_fs_incompat(fs_info, HMZONED))
+ return;
+ mutex_lock(&fs_info->hmzoned_meta_io_lock);
+}
+
+static inline void btrfs_hmzoned_meta_io_unlock(struct btrfs_fs_info *fs_info)
+{
+ if (!btrfs_fs_incompat(fs_info, HMZONED))
+ return;
+ mutex_unlock(&fs_info->hmzoned_meta_io_lock);
+}
+
#endif
As same as in data IO path, we must serialize write IOs for metadata. We cannot add mutex around allocation and submit because metadata blocks are allocated in an earlier stage to build up B-trees. Thus, this commit add hmzoned_meta_io_lock and hold it during metadata IO submission in btree_write_cache_pages() to serialize IOs. Furthermore, this commit add per-block grorup metadata IO submission pointer "meta_write_pointer" to ensure sequential writing. Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com> --- fs/btrfs/ctree.h | 3 +++ fs/btrfs/disk-io.c | 1 + fs/btrfs/extent_io.c | 17 ++++++++++++++++- fs/btrfs/hmzoned.c | 45 ++++++++++++++++++++++++++++++++++++++++++++ fs/btrfs/hmzoned.h | 17 +++++++++++++++++ 5 files changed, 82 insertions(+), 1 deletion(-)