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ocfs2: Abstract ocfs2_extent_tree in b-tree operations.

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In the old extent tree operation, we take the hypothesis that we
are using the ocfs2_extent_list in ocfs2_dinode as the tree root.
As xattr will also use ocfs2_extent_list to store large value
for a xattr entry, we refactor the tree operation so that xattr
can use it directly.

The refactoring includes 4 steps:
1. Abstract set/get of last_eb_blk and update_clusters since they may
   be stored in different location for dinode and xattr.
2. Add a new structure named ocfs2_extent_tree to indicate the
   extent tree the operation will work on.
3. Remove all the use of fe_bh and di, use root_bh and root_el in
   extent tree instead. So now all the fe_bh is replaced with
   et->root_bh, el with root_el accordingly.
4. Make ocfs2_lock_allocators generic. Now it is limited to be only used
   in file extend allocation. But the whole function is useful when we want
   to store large EAs.

Note: This patch doesn't touch ocfs2_commit_truncate() since it is not used
for anything other than truncate inode data btrees.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Tao Ma
2008-08-18 17:38:44 +08:00
committed by Mark Fasheh
parent 811f933df1
commit e7d4cb6bc1
8 changed files with 456 additions and 288 deletions
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23
fs/ocfs2/alloc.h
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@@ -26,28 +26,37 @@
#ifndef OCFS2_ALLOC_H
#define OCFS2_ALLOC_H
enum ocfs2_extent_tree_type {
OCFS2_DINODE_EXTENT = 0,
};
struct ocfs2_alloc_context;
int ocfs2_insert_extent(struct ocfs2_super *osb,
handle_t *handle,
struct inode *inode,
struct buffer_head *fe_bh,
struct buffer_head *root_bh,
u32 cpos,
u64 start_blk,
u32 new_clusters,
u8 flags,
struct ocfs2_alloc_context *meta_ac);
struct ocfs2_alloc_context *meta_ac,
enum ocfs2_extent_tree_type et_type);
struct ocfs2_cached_dealloc_ctxt;
int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *di_bh,
int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh,
handle_t *handle, u32 cpos, u32 len, u32 phys,
struct ocfs2_alloc_context *meta_ac,
struct ocfs2_cached_dealloc_ctxt *dealloc);
int ocfs2_remove_extent(struct inode *inode, struct buffer_head *di_bh,
struct ocfs2_cached_dealloc_ctxt *dealloc,
enum ocfs2_extent_tree_type et_type);
int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh,
u32 cpos, u32 len, handle_t *handle,
struct ocfs2_alloc_context *meta_ac,
struct ocfs2_cached_dealloc_ctxt *dealloc);
struct ocfs2_cached_dealloc_ctxt *dealloc,
enum ocfs2_extent_tree_type et_type);
int ocfs2_num_free_extents(struct ocfs2_super *osb,
struct inode *inode,
struct buffer_head *bh);
struct buffer_head *root_bh,
enum ocfs2_extent_tree_type et_type);
/*
* how many new metadata chunks would an allocation need at maximum?
*