[Ocfs2-devel] [PATCH 4/8] Ocfs2: move a range of extent.
Tristan Ye
tristan.ye at oracle.com
Tue Dec 28 03:40:44 PST 2010
The range of __ocfs2_move_extent() was within one extent always, it consists
following parts:
1. Duplicates the clusters in pages to new_blkoffset, where extent to be moved.
2. Split the original extent with new extent, coalecse the nearby extents if possible
3. Append old clusters to truncate log.
Signed-off-by: Tristan Ye <tristan.ye at oracle.com>
---
fs/ocfs2/move_extents.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 82 insertions(+), 0 deletions(-)
diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c
index 3601545..7e9daab 100644
--- a/fs/ocfs2/move_extents.c
+++ b/fs/ocfs2/move_extents.c
@@ -156,6 +156,88 @@ unlock:
return ret;
}
+static int __ocfs2_move_extent(handle_t *handle,
+ struct ocfs2_move_extents_context *context,
+ u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos)
+{
+ int ret = 0, index;
+ struct inode *inode = context->inode;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct ocfs2_extent_rec *rec, replace_rec;
+ struct ocfs2_path *path = NULL;
+ struct ocfs2_extent_list *el;
+ u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci);
+ u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos);
+
+ ret = ocfs2_duplicate_clusters_by_page(handle, context, cpos, p_cpos,
+ new_p_cpos, len);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ memset(&replace_rec, 0, sizeof(replace_rec));
+ replace_rec.e_cpos = cpu_to_le32(cpos);
+ replace_rec.e_leaf_clusters = cpu_to_le16(len);
+ replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb,
+ new_p_cpos));
+
+ path = ocfs2_new_path_from_et(&context->et);
+ if (!path) {
+ ret = -ENOMEM;
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ el = path_leaf_el(path);
+
+ index = ocfs2_search_extent_list(el, cpos);
+ if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
+ ocfs2_error(inode->i_sb,
+ "Inode %llu has an extent at cpos %u which can no "
+ "longer be found.\n",
+ (unsigned long long)ino, cpos);
+ ret = -EROFS;
+ goto out;
+ }
+
+ rec = &el->l_recs[index];
+ replace_rec.e_flags = rec->e_flags;
+
+ ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
+ context->et.et_root_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ret = ocfs2_split_extent(handle, &context->et, path, index,
+ &replace_rec, context->meta_ac,
+ &context->dealloc);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ocfs2_journal_dirty(handle, context->et.et_root_bh);
+
+ /*
+ * need I to append truncate log for old clusters?
+ */
+ if (old_blkno)
+ ret = ocfs2_truncate_log_append(osb, handle, old_blkno, len);
+
+out:
+ return ret;
+}
+
static int ocfs2_move_extents(struct ocfs2_move_extents_context *context)
{
int status;
--
1.5.5
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