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-rw-r--r--fs/nilfs2/alloc.c27
-rw-r--r--fs/nilfs2/alloc.h21
-rw-r--r--fs/nilfs2/mdt.c2
-rw-r--r--fs/nilfs2/mdt.h2
4 files changed, 52 insertions, 0 deletions
diff --git a/fs/nilfs2/alloc.c b/fs/nilfs2/alloc.c
index 7e2b3ce57aa..c56300d8d17 100644
--- a/fs/nilfs2/alloc.c
+++ b/fs/nilfs2/alloc.c
@@ -491,3 +491,30 @@ int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems)
}
return 0;
}
+
+void nilfs_palloc_setup_cache(struct inode *inode,
+ struct nilfs_palloc_cache *cache)
+{
+ NILFS_MDT(inode)->mi_palloc_cache = cache;
+ spin_lock_init(&cache->lock);
+}
+
+void nilfs_palloc_clear_cache(struct inode *inode)
+{
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ spin_lock(&cache->lock);
+ brelse(cache->prev_desc.bh);
+ brelse(cache->prev_bitmap.bh);
+ brelse(cache->prev_entry.bh);
+ cache->prev_desc.bh = NULL;
+ cache->prev_bitmap.bh = NULL;
+ cache->prev_entry.bh = NULL;
+ spin_unlock(&cache->lock);
+}
+
+void nilfs_palloc_destroy_cache(struct inode *inode)
+{
+ nilfs_palloc_clear_cache(inode);
+ NILFS_MDT(inode)->mi_palloc_cache = NULL;
+}
diff --git a/fs/nilfs2/alloc.h b/fs/nilfs2/alloc.h
index 4ace5475c2c..f4543ac4f56 100644
--- a/fs/nilfs2/alloc.h
+++ b/fs/nilfs2/alloc.h
@@ -69,4 +69,25 @@ int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
#define nilfs_clear_bit_atomic ext2_clear_bit_atomic
#define nilfs_find_next_zero_bit ext2_find_next_zero_bit
+/*
+ * persistent object allocator cache
+ */
+
+struct nilfs_bh_assoc {
+ unsigned long blkoff;
+ struct buffer_head *bh;
+};
+
+struct nilfs_palloc_cache {
+ spinlock_t lock;
+ struct nilfs_bh_assoc prev_desc;
+ struct nilfs_bh_assoc prev_bitmap;
+ struct nilfs_bh_assoc prev_entry;
+};
+
+void nilfs_palloc_setup_cache(struct inode *inode,
+ struct nilfs_palloc_cache *cache);
+void nilfs_palloc_clear_cache(struct inode *inode);
+void nilfs_palloc_destroy_cache(struct inode *inode);
+
#endif /* _NILFS_ALLOC_H */
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
index 948b1f8bc50..06713ffcc7f 100644
--- a/fs/nilfs2/mdt.c
+++ b/fs/nilfs2/mdt.c
@@ -571,6 +571,8 @@ void nilfs_mdt_destroy(struct inode *inode)
{
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
+ if (mdi->mi_palloc_cache)
+ nilfs_palloc_destroy_cache(inode);
nilfs_mdt_clear(inode);
kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
diff --git a/fs/nilfs2/mdt.h b/fs/nilfs2/mdt.h
index c396b6c0393..6c4bbb0470f 100644
--- a/fs/nilfs2/mdt.h
+++ b/fs/nilfs2/mdt.h
@@ -36,6 +36,7 @@
* @mi_entry_size: size of an entry
* @mi_first_entry_offset: offset to the first entry
* @mi_entries_per_block: number of entries in a block
+ * @mi_palloc_cache: persistent object allocator cache
* @mi_blocks_per_group: number of blocks in a group
* @mi_blocks_per_desc_block: number of blocks per descriptor block
*/
@@ -46,6 +47,7 @@ struct nilfs_mdt_info {
unsigned mi_entry_size;
unsigned mi_first_entry_offset;
unsigned long mi_entries_per_block;
+ struct nilfs_palloc_cache *mi_palloc_cache;
unsigned long mi_blocks_per_group;
unsigned long mi_blocks_per_desc_block;
};