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authorTao Ma <tao.ma@oracle.com>2009-08-18 11:28:39 +0800
committerJoel Becker <joel.becker@oracle.com>2009-09-22 20:09:34 -0700
commit1aa75fea64bc26bda9be9b1b20ae253d7a481877 (patch)
tree5da0c235f1323b9771e44a18a5452c83c0969547 /fs/ocfs2/refcounttree.c
parent1823cb0b9fe5e6d48017ee3f92428f69c0235d87 (diff)
downloadop-kernel-dev-1aa75fea64bc26bda9be9b1b20ae253d7a481877.zip
op-kernel-dev-1aa75fea64bc26bda9be9b1b20ae253d7a481877.tar.gz
ocfs2: Add functions for extents refcounted.
Add function ocfs2_mark_extent_refcounted which can mark an extent refcounted. Signed-off-by: Tao Ma <tao.ma@oracle.com>
Diffstat (limited to 'fs/ocfs2/refcounttree.c')
-rw-r--r--fs/ocfs2/refcounttree.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 2c7974c..f7d19f4 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -2153,3 +2153,42 @@ out:
brelse(ref_root_bh);
return ret;
}
+
+/*
+ * Mark the already-existing extent at cpos as refcounted for len clusters.
+ * This adds the refcount extent flag.
+ *
+ * If the existing extent is larger than the request, initiate a
+ * split. An attempt will be made at merging with adjacent extents.
+ *
+ * The caller is responsible for passing down meta_ac if we'll need it.
+ */
+static int ocfs2_mark_extent_refcounted(struct inode *inode,
+ struct ocfs2_extent_tree *et,
+ handle_t *handle, u32 cpos,
+ u32 len, u32 phys,
+ struct ocfs2_alloc_context *meta_ac,
+ struct ocfs2_cached_dealloc_ctxt *dealloc)
+{
+ int ret;
+
+ mlog(0, "Inode %lu refcount tree cpos %u, len %u, phys cluster %u\n",
+ inode->i_ino, cpos, len, phys);
+
+ if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb))) {
+ ocfs2_error(inode->i_sb, "Inode %lu want to use refcount "
+ "tree, but the feature bit is not set in the "
+ "super block.", inode->i_ino);
+ ret = -EROFS;
+ goto out;
+ }
+
+ ret = ocfs2_change_extent_flag(handle, et, cpos,
+ len, phys, meta_ac, dealloc,
+ OCFS2_EXT_REFCOUNTED, 0);
+ if (ret)
+ mlog_errno(ret);
+
+out:
+ return ret;
+}
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