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Subject[75/90] ext4: move_extent_per_page() cleanup
2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------
(cherry picked from commit ac48b0a1d068887141581bea8285de5fcab182b0)

Integrate duplicate lines (acquire/release semaphore and invalidate
extent cache in move_extent_per_page()) into mext_replace_branches(),
to reduce source and object code size.

Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
fs/ext4/move_extent.c | 30 +++++++++---------------------
1 file changed, 9 insertions(+), 21 deletions(-)

--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -660,6 +660,9 @@ mext_replace_branches(handle_t *handle,
int replaced_count = 0;
int dext_alen;

+ /* Protect extent trees against block allocations via delalloc */
+ double_down_write_data_sem(orig_inode, donor_inode);
+
/* Get the original extent for the block "orig_off" */
*err = get_ext_path(orig_inode, orig_off, &orig_path);
if (*err)
@@ -755,6 +758,11 @@ out:
kfree(donor_path);
}

+ ext4_ext_invalidate_cache(orig_inode);
+ ext4_ext_invalidate_cache(donor_inode);
+
+ double_up_write_data_sem(orig_inode, donor_inode);
+
return replaced_count;
}

@@ -820,19 +828,9 @@ move_extent_per_page(struct file *o_filp
* Just swap data blocks between orig and donor.
*/
if (uninit) {
- /*
- * Protect extent trees against block allocations
- * via delalloc
- */
- double_down_write_data_sem(orig_inode, donor_inode);
replaced_count = mext_replace_branches(handle, orig_inode,
donor_inode, orig_blk_offset,
block_len_in_page, err);
-
- /* Clear the inode cache not to refer to the old data */
- ext4_ext_invalidate_cache(orig_inode);
- ext4_ext_invalidate_cache(donor_inode);
- double_up_write_data_sem(orig_inode, donor_inode);
goto out2;
}

@@ -880,8 +878,6 @@ move_extent_per_page(struct file *o_filp
/* Release old bh and drop refs */
try_to_release_page(page, 0);

- /* Protect extent trees against block allocations via delalloc */
- double_down_write_data_sem(orig_inode, donor_inode);
replaced_count = mext_replace_branches(handle, orig_inode, donor_inode,
orig_blk_offset, block_len_in_page,
&err2);
@@ -890,18 +886,10 @@ move_extent_per_page(struct file *o_filp
block_len_in_page = replaced_count;
replaced_size =
block_len_in_page << orig_inode->i_blkbits;
- } else {
- double_up_write_data_sem(orig_inode, donor_inode);
+ } else
goto out;
- }
}

- /* Clear the inode cache not to refer to the old data */
- ext4_ext_invalidate_cache(orig_inode);
- ext4_ext_invalidate_cache(donor_inode);
-
- double_up_write_data_sem(orig_inode, donor_inode);
-
if (!page_has_buffers(page))
create_empty_buffers(page, 1 << orig_inode->i_blkbits, 0);




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