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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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11
fs/ocfs2/aops.c
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@@ -1278,7 +1278,8 @@ static int ocfs2_write_cluster(struct address_space *mapping,
} else if (unwritten) {
ret = ocfs2_mark_extent_written(inode, wc->w_di_bh,
wc->w_handle, cpos, 1, phys,
meta_ac, &wc->w_dealloc);
meta_ac, &wc->w_dealloc,
OCFS2_DINODE_EXTENT);
if (ret < 0) {
mlog_errno(ret);
goto out;
@@ -1712,7 +1713,13 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
* ocfs2_lock_allocators(). It greatly over-estimates
* the work to be done.
*/
ret = ocfs2_lock_allocators(inode, wc->w_di_bh,
mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u,"
" clusters_to_add = %u, extents_to_split = %u\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
(long long)i_size_read(inode), le32_to_cpu(di->i_clusters),
clusters_to_alloc, extents_to_split);
ret = ocfs2_lock_allocators(inode, wc->w_di_bh, &di->id2.i_list,
clusters_to_alloc, extents_to_split,
&data_ac, &meta_ac);
if (ret) {