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ocfs2: btree changes for unwritten extents

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Writes to a region marked as unwritten might result in a record split or
merge. We can support splits by making minor changes to the existing insert
code. Merges require left rotations which mostly re-use right rotation
support functions.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh
2007-06-18 10:48:04 -07:00
parent c3afcbb344
commit 328d5752e1
6 changed files with 1770 additions and 91 deletions
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31
fs/ocfs2/extent_map.c
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@ -373,37 +373,6 @@ out:
return ret;
}
/*
* Return the index of the extent record which contains cluster #v_cluster.
* -1 is returned if it was not found.
*
* Should work fine on interior and exterior nodes.
*/
static int ocfs2_search_extent_list(struct ocfs2_extent_list *el,
u32 v_cluster)
{
int ret = -1;
int i;
struct ocfs2_extent_rec *rec;
u32 rec_end, rec_start, clusters;
for(i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
rec = &el->l_recs[i];
rec_start = le32_to_cpu(rec->e_cpos);
clusters = ocfs2_rec_clusters(el, rec);
rec_end = rec_start + clusters;
if (v_cluster >= rec_start && v_cluster < rec_end) {
ret = i;
break;
}
}
return ret;
}
int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
u32 *p_cluster, u32 *num_clusters,
unsigned int *extent_flags)