linux-ext4 - [PATCH] ext4: defragmentation code cleanup

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Message-Id: <1365520559-6622-1-git-send-email-dmonakhov@openvz.org>
Date:	Tue,  9 Apr 2013 19:15:59 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	linux-ext4@...r.kernel.org
Cc:	Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH] ext4: defragmentation code cleanup

- grab_cache_page_write_begin() may not wait on page's writeback since
  (1d1d1a767206). But it is still reasonable to wait on page's writeback
  here in order to be on the safe side.

- Fix miss typo: pass 'length' instead of 'end' to __block_write_begin()
  https://bugzilla.kernel.org/show_bug.cgi?id=56241

TESTCASE: git://oss.sgi.com/xfs/cmds/xfstests.git
MKFS_OPTIONS="-b1024" ; ./check ext4/304

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 fs/ext4/move_extent.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 33e1c08..58b33e9 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -737,6 +737,7 @@ mext_replace_branches(handle_t *handle, struct inode *orig_inode,
 		donor_off += dext_alen;
 		orig_off += dext_alen;
 
+		BUG_ON(replaced_count > count);
 		/* Already moved the expected blocks */
 		if (replaced_count >= count)
 			break;
@@ -814,7 +815,13 @@ mext_page_double_lock(struct inode *inode1, struct inode *inode2,
 		page_cache_release(page[0]);
 		return -ENOMEM;
 	}
-
+	/*
+	 * grab_cache_page_write_begin() may not wait on page's writeback if
+	 * BDI not demand that. But it is reasonable to be very conservative
+	 * here and explicitly wait on page's writeback
+	 */
+	wait_on_page_writeback(page[0]);
+	wait_on_page_writeback(page[1]);
 	if (inode1 > inode2) {
 		struct page *tmp;
 		tmp = page[0];
@@ -1033,7 +1040,7 @@ data_copy:
 	}
 	/* Perform all necessary steps similar write_begin()/write_end()
 	 * but keeping in mind that i_size will not change */
-	*err = __block_write_begin(pagep[0], from, from + replaced_size,
+	*err = __block_write_begin(pagep[0], from, replaced_size,
 				   ext4_get_block);
 	if (!*err)
 		*err = block_commit_write(pagep[0], from, from + replaced_size);
-- 
1.7.1

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