linux-kernel - [patch 4/6] jbd: remove dependency on __GFP

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Date:	Mon, 16 Aug 2010 19:58:01 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [patch 4/6] jbd: remove dependency on __GFP_NOFAIL

Removes the dependency on __GFP_NOFAIL by looping indefinitely in the
caller.

The error handling when kzalloc() returns NULL in start_this_handle()
was removed since it was unreachable.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 fs/jbd/journal.c     |    5 ++++-
 fs/jbd/transaction.c |   14 ++++++--------
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -301,7 +301,10 @@ int journal_write_metadata_buffer(transaction_t *transaction,
 	 */
 	J_ASSERT_BH(bh_in, buffer_jbddirty(bh_in));
 
-	new_bh = alloc_buffer_head(GFP_NOFS|__GFP_NOFAIL);
+	do {
+		/* FIXME: this may potentially loop forever */
+		new_bh = alloc_buffer_head(GFP_NOFS);
+	} while (!new_bh);
 	/* keep subsequent assertions sane */
 	new_bh->b_state = 0;
 	init_buffer(new_bh, NULL, NULL);
diff --git a/fs/jbd/transaction.c b/fs/jbd/transaction.c
--- a/fs/jbd/transaction.c
+++ b/fs/jbd/transaction.c
@@ -98,14 +98,12 @@ static int start_this_handle(journal_t *journal, handle_t *handle)
 	}
 
 alloc_transaction:
-	if (!journal->j_running_transaction) {
-		new_transaction = kzalloc(sizeof(*new_transaction),
-						GFP_NOFS|__GFP_NOFAIL);
-		if (!new_transaction) {
-			ret = -ENOMEM;
-			goto out;
-		}
-	}
+	if (!journal->j_running_transaction)
+		do {
+			/* FIXME: this may potentially loop forever */
+			new_transaction = kzalloc(sizeof(*new_transaction),
+								GFP_NOFS);
+		} while (!new_transaction);
 
 	jbd_debug(3, "New handle %p going live.\n", handle);
 
--
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