linux-ext4 - [PATCH] ext4: Fix delalloc sync hang with journal lock inversion

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Date:	Wed, 21 May 2008 23:14:17 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	cmm@...ibm.com, tytso@....edu, sandeen@...hat.com
Cc:	linux-ext4@...r.kernel.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH] ext4: Fix delalloc sync hang with journal lock inversion

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
 fs/ext4/inode.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 46cc610..076d00f 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1571,13 +1571,17 @@ static int ext4_da_writepages(struct address_space *mapping,
 		 */
 		if (wbc->nr_to_write > EXT4_MAX_WRITEBACK_PAGES)
 			wbc->nr_to_write = EXT4_MAX_WRITEBACK_PAGES;
-		to_write -= wbc->nr_to_write;
 
+		to_write -= wbc->nr_to_write;
 		ret = mpage_da_writepages(mapping, wbc, ext4_da_get_block_write);
 		ext4_journal_stop(handle);
-		to_write +=wbc->nr_to_write;
+		if (wbc->nr_to_write) {
+			/* We failed to write what we requested for */
+			to_write += wbc->nr_to_write;
+			break;
+		}
+		wbc->nr_to_write = to_write;
 	}
-
 out_writepages:
 	wbc->nr_to_write = to_write;
 	wbc->range_cyclic = range_cyclic;
-- 
1.5.5.1.211.g65ea3.dirty

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