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authorTristan Ye <tristan.ye@oracle.com>2011-03-18 09:35:34 +0300
committerTristan Ye <tristan.ye@oracle.com>2011-05-25 11:17:09 +0400
commit202ee5facb2c55f36a4324a4f56d8bdf3617a579 (patch)
tree22875e904e85cf1ef9419119914314fe4dd48550 /fs/ocfs2/move_extents.c
parent8f603e567aa7a243e68ca48b4f105b990851360f (diff)
downloadlinux-202ee5facb2c55f36a4324a4f56d8bdf3617a579.tar.xz
Ocfs2/move_extents: defrag a range of extent.
It's a relatively complete function to accomplish defragmentation for entire or partial extent, one journal handle was kept during the operation, it was logically doing one more thing than ocfs2_move_extent() acutally, yes, it's claiming the new clusters itself;-) Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
Diffstat (limited to 'fs/ocfs2/move_extents.c')
-rw-r--r--fs/ocfs2/move_extents.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/fs/ocfs2/move_extents.c b/fs/ocfs2/move_extents.c
index d1bd5a347e9c..78db10d4c7f1 100644
--- a/fs/ocfs2/move_extents.c
+++ b/fs/ocfs2/move_extents.c
@@ -215,3 +215,139 @@ out:
return ret;
}
+
+/*
+ * Using one journal handle to guarantee the data consistency in case
+ * crash happens anywhere.
+ */
+static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
+ u32 cpos, u32 phys_cpos, u32 len, int ext_flags)
+{
+ int ret, credits = 0, extra_blocks = 0;
+ handle_t *handle;
+ struct inode *inode = context->inode;
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ struct inode *tl_inode = osb->osb_tl_inode;
+ struct ocfs2_refcount_tree *ref_tree = NULL;
+ u32 new_phys_cpos, new_len;
+ u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
+
+ if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) {
+
+ BUG_ON(!(OCFS2_I(inode)->ip_dyn_features &
+ OCFS2_HAS_REFCOUNT_FL));
+
+ BUG_ON(!context->refcount_loc);
+
+ ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
+ &ref_tree, NULL);
+ if (ret) {
+ mlog_errno(ret);
+ return ret;
+ }
+
+ ret = ocfs2_prepare_refcount_change_for_del(inode,
+ context->refcount_loc,
+ phys_blkno,
+ len,
+ &credits,
+ &extra_blocks);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+ }
+
+ ret = ocfs2_lock_allocators_move_extents(inode, &context->et, len, 1,
+ &context->meta_ac,
+ &context->data_ac,
+ extra_blocks, &credits);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ /*
+ * should be using allocation reservation strategy there?
+ *
+ * if (context->data_ac)
+ * context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
+ */
+
+ mutex_lock(&tl_inode->i_mutex);
+
+ if (ocfs2_truncate_log_needs_flush(osb)) {
+ ret = __ocfs2_flush_truncate_log(osb);
+ if (ret < 0) {
+ mlog_errno(ret);
+ goto out_unlock_mutex;
+ }
+ }
+
+ handle = ocfs2_start_trans(osb, credits);
+ if (IS_ERR(handle)) {
+ ret = PTR_ERR(handle);
+ mlog_errno(ret);
+ goto out_unlock_mutex;
+ }
+
+ ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, len,
+ &new_phys_cpos, &new_len);
+ if (ret) {
+ mlog_errno(ret);
+ goto out_commit;
+ }
+
+ /*
+ * we're not quite patient here to make multiple attempts for claiming
+ * enough clusters, failure to claim clusters per-requested is not a
+ * disaster though, it can only mean partial range of defragmentation
+ * or extent movements gets gone, users anyway is able to have another
+ * try as they wish anytime, since they're going to be returned a
+ * '-ENOSPC' and completed length of this movement.
+ */
+ if (new_len != len) {
+ mlog(0, "len_claimed: %u, len: %u\n", new_len, len);
+ context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
+ ret = -ENOSPC;
+ goto out_commit;
+ }
+
+ mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
+ phys_cpos, new_phys_cpos);
+
+ ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos,
+ new_phys_cpos, ext_flags);
+ if (ret)
+ mlog_errno(ret);
+
+ /*
+ * Here we should write the new page out first if we are
+ * in write-back mode.
+ */
+ ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len);
+ if (ret)
+ mlog_errno(ret);
+
+out_commit:
+ ocfs2_commit_trans(osb, handle);
+
+out_unlock_mutex:
+ mutex_unlock(&tl_inode->i_mutex);
+
+ if (context->data_ac) {
+ ocfs2_free_alloc_context(context->data_ac);
+ context->data_ac = NULL;
+ }
+
+ if (context->meta_ac) {
+ ocfs2_free_alloc_context(context->meta_ac);
+ context->meta_ac = NULL;
+ }
+
+out:
+ if (ref_tree)
+ ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
+
+ return ret;
+}