[PATCH 14/39] ocfs2: Add xattr index tree operations

Mark Fasheh
2008-09-24T22:04:30Z

From: Tao Ma <tao.ma@oracle.com>

When necessary, an ocfs2_xattr_block will embed an ocfs2_extent_list to
store large numbers of EAs. This patch adds a new type in
ocfs2_extent_tree_type and adds the implementation so that we can re-use the
b-tree code to handle the storage of many EAs.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
---
fs/ocfs2/alloc.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/ocfs2/alloc.h | 10 ++++++
2 files changed, 99 insertions(+), 0 deletions(-)

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index d175db1..47cdea6 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -177,6 +177,48 @@ static struct ocfs2_extent_tree_operations ocfs2_xattr_et_ops = {
.sanity_check = ocfs2_xattr_value_sanity_check,
};

+static void ocfs2_xattr_tree_set_last_eb_blk(struct ocfs2_extent_tree *et,
+ u64 blkno)
+{
+ struct ocfs2_xattr_block *xb =
+ (struct ocfs2_xattr_block *) et->root_bh->b_data;
+ struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
+
+ xt->xt_last_eb_blk = cpu_to_le64(blkno);
+}
+
+static u64 ocfs2_xattr_tree_get_last_eb_blk(struct ocfs2_extent_tree *et)
+{
+ struct ocfs2_xattr_block *xb =
+ (struct ocfs2_xattr_block *) et->root_bh->b_data;
+ struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
+
+ return le64_to_cpu(xt->xt_last_eb_blk);
+}
+
+static void ocfs2_xattr_tree_update_clusters(struct inode *inode,
+ struct ocfs2_extent_tree *et,
+ u32 clusters)
+{
+ struct ocfs2_xattr_block *xb =
+ (struct ocfs2_xattr_block *)et->root_bh->b_data;
+
+ le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, clusters);
+}
+
+static int ocfs2_xattr_tree_sanity_check(struct inode *inode,
+ struct ocfs2_extent_tree *et)
+{
+ return 0;
+}
+
+static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
+ .set_last_eb_blk = ocfs2_xattr_tree_set_last_eb_blk,
+ .get_last_eb_blk = ocfs2_xattr_tree_get_last_eb_blk,
+ .update_clusters = ocfs2_xattr_tree_update_clusters,
+ .sanity_check = ocfs2_xattr_tree_sanity_check,
+};
+
static struct ocfs2_extent_tree*
ocfs2_new_extent_tree(struct buffer_head *bh,
enum ocfs2_extent_tree_type et_type,
@@ -201,6 +243,11 @@ static struct ocfs2_extent_tree*
(struct ocfs2_xattr_value_root *) private;
et->root_el = &xv->xr_list;
et->eops = &ocfs2_xattr_et_ops;
+ } else if (et_type == OCFS2_XATTR_TREE_EXTENT) {
+ struct ocfs2_xattr_block *xb =
+ (struct ocfs2_xattr_block *)bh->b_data;
+ et->root_el = &xb->xb_attrs.xb_root.xt_list;
+ et->eops = &ocfs2_xattr_tree_et_ops;
}

return et;
@@ -570,6 +617,12 @@ int ocfs2_num_free_extents(struct ocfs2_super *osb,

last_eb_blk = le64_to_cpu(xv->xr_last_eb_blk);
el = &xv->xr_list;
+ } else if (type == OCFS2_XATTR_TREE_EXTENT) {
+ struct ocfs2_xattr_block *xb =
+ (struct ocfs2_xattr_block *)root_bh->b_data;
+
+ last_eb_blk = le64_to_cpu(xb->xb_attrs.xb_root.xt_last_eb_blk);
+ el = &xb->xb_attrs.xb_root.xt_list;
}

if (last_eb_blk) {
@@ -4406,6 +4459,36 @@ bail:
return status;
}

+int ocfs2_xattr_tree_insert_extent(struct ocfs2_super *osb,
+ handle_t *handle,
+ struct inode *inode,
+ struct buffer_head *root_bh,
+ u32 cpos,
+ u64 start_blk,
+ u32 new_clusters,
+ u8 flags,
+ struct ocfs2_alloc_context *meta_ac)
+{
+ int status;
+ struct ocfs2_extent_tree *et = NULL;
+
+ et = ocfs2_new_extent_tree(root_bh, OCFS2_XATTR_TREE_EXTENT, NULL);
+ if (!et) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
+ status = ocfs2_insert_extent(osb, handle, inode, root_bh,
+ cpos, start_blk, new_clusters,
+ flags, meta_ac, et);
+
+ if (et)
+ ocfs2_free_extent_tree(et);
+bail:
+ return status;
+}
+
/*
* Allcate and add clusters into the extent b-tree.
* The new clusters(clusters_to_add) will be inserted at logical_offset.
@@ -4491,6 +4574,12 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
status = ocfs2_dinode_insert_extent(osb, handle, inode, root_bh,
*logical_offset, block,
num_bits, flags, meta_ac);
+ else if (type == OCFS2_XATTR_TREE_EXTENT)
+ status = ocfs2_xattr_tree_insert_extent(osb, handle,
+ inode, root_bh,
+ *logical_offset,
+ block, num_bits, flags,
+ meta_ac);
else
status = ocfs2_xattr_value_insert_extent(osb, handle,
inode, root_bh,
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index 168e86e..b8cfc53 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -29,6 +29,7 @@
enum ocfs2_extent_tree_type {
OCFS2_DINODE_EXTENT = 0,
OCFS2_XATTR_VALUE_EXTENT,
+ OCFS2_XATTR_TREE_EXTENT,
};

struct ocfs2_alloc_context;
@@ -51,6 +52,15 @@ int ocfs2_xattr_value_insert_extent(struct ocfs2_super *osb,
u8 flags,
struct ocfs2_alloc_context *meta_ac,
void *private);
+int ocfs2_xattr_tree_insert_extent(struct ocfs2_super *osb,
+ handle_t *handle,
+ struct inode *inode,
+ struct buffer_head *root_bh,
+ u32 cpos,
+ u64 start_blk,
+ u32 new_clusters,
+ u8 flags,
+ struct ocfs2_alloc_context *meta_ac);
enum ocfs2_alloc_restarted {
RESTART_NONE = 0,
RESTART_TRANS,
--
1.5.4.5