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ocfs2: Make ocfs2_extent_tree the first-class representation of a tree.

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We now have three different kinds of extent trees in ocfs2: inode data
(dinode), extended attributes (xattr_tree), and extended attribute
values (xattr_value).  There is a nice abstraction for them,
ocfs2_extent_tree, but it is hidden in alloc.c.  All the calling
functions have to pick amongst a varied API and pass in type bits and
often extraneous pointers.

A better way is to make ocfs2_extent_tree a first-class object.
Everyone converts their object to an ocfs2_extent_tree() via the
ocfs2_get_*_extent_tree() calls, then uses the ocfs2_extent_tree for all
tree calls to alloc.c.

This simplifies a lot of callers, making for readability.  It also
provides an easy way to add additional extent tree types, as they only
need to be defined in alloc.c with a ocfs2_get_<new>_extent_tree()
function.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker
2008-08-20 19:36:33 -07:00
committed by Mark Fasheh
parent 1e61ee79e2
commit f99b9b7ccf
8 changed files with 240 additions and 332 deletions
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36
fs/ocfs2/file.c
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@ -509,14 +509,17 @@ int ocfs2_add_inode_data(struct ocfs2_super *osb,
struct ocfs2_alloc_context *meta_ac,
enum ocfs2_alloc_restarted *reason_ret)
{
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
struct ocfs2_extent_list *el = &fe->id2.i_list;
int ret;
struct ocfs2_extent_tree et;
return ocfs2_add_clusters_in_btree(osb, inode, logical_offset,
ocfs2_get_dinode_extent_tree(&et, inode, fe_bh);
ret = ocfs2_add_clusters_in_btree(osb, inode, logical_offset,
clusters_to_add, mark_unwritten,
fe_bh, el, handle,
data_ac, meta_ac, reason_ret,
OCFS2_DINODE_EXTENT, NULL);
&et, handle,
data_ac, meta_ac, reason_ret);
ocfs2_put_extent_tree(&et);
return ret;
}
static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
@ -533,6 +536,7 @@ static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
struct ocfs2_alloc_context *meta_ac = NULL;
enum ocfs2_alloc_restarted why;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_extent_tree et;
mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
@ -564,9 +568,10 @@ restart_all:
(unsigned long long)OCFS2_I(inode)->ip_blkno,
(long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
clusters_to_add);
status = ocfs2_lock_allocators(inode, bh, &fe->id2.i_list,
clusters_to_add, 0, &data_ac,
&meta_ac, OCFS2_DINODE_EXTENT, NULL);
ocfs2_get_dinode_extent_tree(&et, inode, bh);
status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
&data_ac, &meta_ac);
ocfs2_put_extent_tree(&et);
if (status) {
mlog_errno(status);
goto leave;
@ -1236,11 +1241,13 @@ static int __ocfs2_remove_inode_range(struct inode *inode,
handle_t *handle;
struct ocfs2_alloc_context *meta_ac = NULL;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
struct ocfs2_extent_tree et;
ret = ocfs2_lock_allocators(inode, di_bh, &di->id2.i_list,
0, 1, NULL, &meta_ac,
OCFS2_DINODE_EXTENT, NULL);
ocfs2_get_dinode_extent_tree(&et, inode, di_bh);
ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
if (ret) {
ocfs2_put_extent_tree(&et);
mlog_errno(ret);
return ret;
}
@ -1269,8 +1276,8 @@ static int __ocfs2_remove_inode_range(struct inode *inode,
goto out;
}
ret = ocfs2_remove_extent(inode, di_bh, cpos, len, handle, meta_ac,
dealloc, OCFS2_DINODE_EXTENT, NULL);
ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
dealloc);
if (ret) {
mlog_errno(ret);
goto out_commit;
@ -1297,6 +1304,7 @@ out:
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
ocfs2_put_extent_tree(&et);
return ret;
}