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ocfs2: abstract btree growing calls 

The top level calls and logic for growing a tree can easily be abstracted
out of ocfs2_insert_extent() into a seperate function - ocfs2_grow_tree().

This allows future code to easily grow btrees when needed.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh 2007-05-29 14:28:51 -07:00
parent 1f6697d072
commit c3afcbb344
1 changed files with 74 additions and 45 deletions
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119
fs/ocfs2/alloc.c
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@ -824,6 +824,74 @@ bail:
return status;
}
/*
* Grow a b-tree so that it has more records.
*
* We might shift the tree depth in which case existing paths should
* be considered invalid.
*
* Tree depth after the grow is returned via *final_depth.
*/
static int ocfs2_grow_tree(struct inode *inode, handle_t *handle,
struct buffer_head *di_bh, int *final_depth,
struct buffer_head *last_eb_bh,
struct ocfs2_alloc_context *meta_ac)
{
int ret, shift;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
int depth = le16_to_cpu(di->id2.i_list.l_tree_depth);
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct buffer_head *bh = NULL;
BUG_ON(meta_ac == NULL);
shift = ocfs2_find_branch_target(osb, inode, di_bh, &bh);
if (shift < 0) {
ret = shift;
mlog_errno(ret);
goto out;
}
/* We traveled all the way to the bottom of the allocation tree
* and didn't find room for any more extents - we need to add
* another tree level */
if (shift) {
BUG_ON(bh);
mlog(0, "need to shift tree depth (current = %d)\n", depth);
/* ocfs2_shift_tree_depth will return us a buffer with
* the new extent block (so we can pass that to
* ocfs2_add_branch). */
ret = ocfs2_shift_tree_depth(osb, handle, inode, di_bh,
meta_ac, &bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
depth++;
/* Special case: we have room now if we shifted from
* tree_depth 0 */
if (depth == 1)
goto out;
}
/* call ocfs2_add_branch to add the final part of the tree with
* the new data. */
mlog(0, "add branch. bh = %p\n", bh);
ret = ocfs2_add_branch(osb, handle, inode, di_bh, bh, last_eb_bh,
meta_ac);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
out:
if (final_depth)
*final_depth = depth;
brelse(bh);
return ret;
}
/*
* This is only valid for leaf nodes, which are the only ones that can
* have empty extents anyway.
@ -2325,7 +2393,7 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
u32 new_clusters,
struct ocfs2_alloc_context *meta_ac)
{
int status, shift;
int status;
struct buffer_head *last_eb_bh = NULL;
struct buffer_head *bh = NULL;
struct ocfs2_insert_type insert = {0, };
@ -2360,55 +2428,16 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
insert.ins_appending, insert.ins_contig, insert.ins_contig_index,
insert.ins_free_records, insert.ins_tree_depth);
/*
* Avoid growing the tree unless we're out of records and the
* insert type requres one.
*/
if (insert.ins_contig != CONTIG_NONE || insert.ins_free_records)
goto out_add;
shift = ocfs2_find_branch_target(osb, inode, fe_bh, &bh);
if (shift < 0) {
status = shift;
mlog_errno(status);
goto bail;
}
/* We traveled all the way to the bottom of the allocation tree
* and didn't find room for any more extents - we need to add
* another tree level */
if (shift) {
BUG_ON(bh);
mlog(0, "need to shift tree depth "
"(current = %d)\n", insert.ins_tree_depth);
/* ocfs2_shift_tree_depth will return us a buffer with
* the new extent block (so we can pass that to
* ocfs2_add_branch). */
status = ocfs2_shift_tree_depth(osb, handle, inode, fe_bh,
meta_ac, &bh);
if (status < 0) {
if (insert.ins_contig == CONTIG_NONE && insert.ins_free_records == 0) {
status = ocfs2_grow_tree(inode, handle, fe_bh,
&insert.ins_tree_depth, last_eb_bh,
meta_ac);
if (status) {
mlog_errno(status);
goto bail;
}
insert.ins_tree_depth++;
/* Special case: we have room now if we shifted from
* tree_depth 0 */
if (insert.ins_tree_depth == 1)
goto out_add;
}
/* call ocfs2_add_branch to add the final part of the tree with
* the new data. */
mlog(0, "add branch. bh = %p\n", bh);
status = ocfs2_add_branch(osb, handle, inode, fe_bh, bh, last_eb_bh,
meta_ac);
if (status < 0) {
mlog_errno(status);
goto bail;
}
out_add:
/* Finally, we can add clusters. This might rotate the tree for us. */
status = ocfs2_do_insert_extent(inode, handle, fe_bh, &rec, &insert);
if (status < 0)