[PATCH v3 2/2] Revert "ocfs2: fix DIO failure due to insufficient transaction credits"

[Heming Zhao <heming.zhao@suse.com>]

This reverts commit be346c1a6eeb49d8fda827d2a9522124c2f72f36.

With the patch "ocfs2: split transactions in dio completion to avoid
credit exhaustion," the jbd2 transaction is now restarted every
OCFS2_DIO_MARK_EXTENT_BATCH loops. In theory, this should prevent
credit exhaustion issues from occurring.

Signed-off-by: Heming Zhao <heming.zhao@suse.com>
---
 fs/ocfs2/aops.c        |  5 -----
 fs/ocfs2/journal.c     | 17 -----------------
 fs/ocfs2/journal.h     |  2 --
 fs/ocfs2/ocfs2_trace.h |  2 --
 4 files changed, 26 deletions(-)

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 60f1b607022f..e58314c6506a 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -2332,11 +2332,6 @@ static int ocfs2_dio_end_io_write(struct inode *inode,
 				break;
 			}
 		}
-		ret = ocfs2_assure_trans_credits(handle, credits);
-		if (ret < 0) {
-			mlog_errno(ret);
-			break;
-		}
 		ret = ocfs2_mark_extent_written(inode, &et, handle,
 						ue->ue_cpos, 1,
 						ue->ue_phys,
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 4c86a9d46870..7e7546e070fb 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -464,23 +464,6 @@ int ocfs2_extend_trans(handle_t *handle, int nblocks)
 	return status;
 }
 
-/*
- * Make sure handle has at least 'nblocks' credits available. If it does not
- * have that many credits available, we will try to extend the handle to have
- * enough credits. If that fails, we will restart transaction to have enough
- * credits. Similar notes regarding data consistency and locking implications
- * as for ocfs2_extend_trans() apply here.
- */
-int ocfs2_assure_trans_credits(handle_t *handle, int nblocks)
-{
-	int old_nblks = jbd2_handle_buffer_credits(handle);
-
-	trace_ocfs2_assure_trans_credits(old_nblks);
-	if (old_nblks >= nblocks)
-		return 0;
-	return ocfs2_extend_trans(handle, nblocks - old_nblks);
-}
-
 /*
  * If we have fewer than thresh credits, extend by OCFS2_MAX_TRANS_DATA.
  * If that fails, restart the transaction & regain write access for the
diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
index 6397170f302f..9d4763f758ad 100644
--- a/fs/ocfs2/journal.h
+++ b/fs/ocfs2/journal.h
@@ -244,8 +244,6 @@ handle_t		    *ocfs2_start_trans(struct ocfs2_super *osb,
 int			     ocfs2_commit_trans(struct ocfs2_super *osb,
 						handle_t *handle);
 int			     ocfs2_extend_trans(handle_t *handle, int nblocks);
-int			     ocfs2_assure_trans_credits(handle_t *handle,
-						int nblocks);
 int			     ocfs2_allocate_extend_trans(handle_t *handle,
 						int thresh);
 
diff --git a/fs/ocfs2/ocfs2_trace.h b/fs/ocfs2/ocfs2_trace.h
index 4b32fb5658ad..74b283875e17 100644
--- a/fs/ocfs2/ocfs2_trace.h
+++ b/fs/ocfs2/ocfs2_trace.h
@@ -2575,8 +2575,6 @@ DEFINE_OCFS2_ULL_UINT_EVENT(ocfs2_commit_cache_end);
 
 DEFINE_OCFS2_INT_INT_EVENT(ocfs2_extend_trans);
 
-DEFINE_OCFS2_INT_EVENT(ocfs2_assure_trans_credits);
-
 DEFINE_OCFS2_INT_EVENT(ocfs2_extend_trans_restart);
 
 DEFINE_OCFS2_INT_INT_EVENT(ocfs2_allocate_extend_trans);
-- 
2.43.0