This adds delete functions for data blocks of metadata files using
bitmap based allocator. nilfs_palloc_delete_entry_block() deletes an
entry block (e.g. block storing dat entries), and
nilfs_palloc_delete_bitmap_block() deletes a bitmap block,
respectively.
These helpers are intended to be used in the successive change on
deallocator of block addresses ("nilfs2: free unused dat file blocks
during garbage collection").
Signed-off-by: Ryusuke Konishi <konishi.ryus...@lab.ntt.co.jp>
---
fs/nilfs2/alloc.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/fs/nilfs2/alloc.c b/fs/nilfs2/alloc.c
index 5b7ee36..225b797 100644
--- a/fs/nilfs2/alloc.c
+++ b/fs/nilfs2/alloc.c
@@ -236,6 +236,26 @@ static int nilfs_palloc_get_block(struct inode *inode,
unsigned long blkoff,
}
/**
+ * nilfs_palloc_delete_block - delete a block on the persistent allocator file
+ * @inode: inode of metadata file using this allocator
+ * @blkoff: block offset
+ * @prev: nilfs_bh_assoc struct of the last used buffer
+ * @lock: spin lock protecting @prev
+ */
+static int nilfs_palloc_delete_block(struct inode *inode, unsigned long blkoff,
+ struct nilfs_bh_assoc *prev,
+ spinlock_t *lock)
+{
+ spin_lock(lock);
+ if (prev->bh && blkoff == prev->blkoff) {
+ brelse(prev->bh);
+ prev->bh = NULL;
+ }
+ spin_unlock(lock);
+ return nilfs_mdt_delete_block(inode, blkoff);
+}
+
+/**
* nilfs_palloc_get_desc_block - get buffer head of a group descriptor block
* @inode: inode of metadata file using this allocator
* @group: group number
@@ -274,6 +294,22 @@ static int nilfs_palloc_get_bitmap_block(struct inode
*inode,
}
/**
+ * nilfs_palloc_delete_bitmap_block - delete a bitmap block
+ * @inode: inode of metadata file using this allocator
+ * @group: group number
+ */
+static int nilfs_palloc_delete_bitmap_block(struct inode *inode,
+ unsigned long group)
+{
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ return nilfs_palloc_delete_block(inode,
+ nilfs_palloc_bitmap_blkoff(inode,
+ group),
+ &cache->prev_bitmap, &cache->lock);
+}
+
+/**
* nilfs_palloc_get_entry_block - get buffer head of an entry block
* @inode: inode of metadata file using this allocator
* @nr: serial number of the entry (e.g. inode number)
@@ -292,6 +328,20 @@ int nilfs_palloc_get_entry_block(struct inode *inode,
__u64 nr,
}
/**
+ * nilfs_palloc_delete_entry_block - delete an entry block
+ * @inode: inode of metadata file using this allocator
+ * @nr: serial number of the entry
+ */
+static int nilfs_palloc_delete_entry_block(struct inode *inode, __u64 nr)
+{
+ struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache;
+
+ return nilfs_palloc_delete_block(inode,
+ nilfs_palloc_entry_blkoff(inode, nr),
+ &cache->prev_entry, &cache->lock);
+}
+
+/**
* nilfs_palloc_block_get_group_desc - get kernel address of a group descriptor
* @inode: inode of metadata file using this allocator
* @group: group number
--
1.8.3.1
--
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