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Date: Tue, 7 Oct 2014 16:36:30 +0800
From: Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
To: <linux-ext4@...r.kernel.org>
CC: <tytso@....edu>, <dmonakhov@...nvz.org>,
Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
Subject: [PATCH] ext4: delete useless comments about ext4_move_extents
In patch 'ext4: refactor ext4_move_extents code base', Dmitry Monakhov has
refactored ext4_move_extents' implementation, but forgot to update the
corresponding comments, this patch will try to delete some useless comments.
Signed-off-by: Xiaoguang Wang <wangxg.fnst@...fujitsu.com>
---
fs/ext4/move_extent.c | 59 ++++++---------------------------------------------
1 file changed, 6 insertions(+), 53 deletions(-)
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 5d78063..9f2311b 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -120,33 +120,12 @@ out:
}
/**
- * mext_replace_branches - Replace original extents with new extents
- *
- * @handle: journal handle
- * @orig_inode: original inode
- * @donor_inode: donor inode
- * @from: block offset of orig_inode
- * @count: block count to be replaced
- * @err: pointer to save return value
- *
- * Replace original inode extents and donor inode extents page by page.
- * We implement this replacement in the following three steps:
- * 1. Save the block information of original and donor inodes into
- * dummy extents.
- * 2. Change the block information of original inode to point at the
- * donor inode blocks.
- * 3. Change the block information of donor inode to point at the saved
- * original inode blocks in the dummy extents.
- *
- * Return replaced block count.
- */
-
-/**
* mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2
*
* @inode1: the inode structure
* @inode2: the inode structure
- * @index: page index
+ * @index1: page index
+ * @index2: page index
* @page: result page vector
*
* Grab two locked pages for inode's by inode order
@@ -266,13 +245,14 @@ out:
* @o_filp: file structure of original file
* @donor_inode: donor inode
* @orig_page_offset: page index on original file
+ * @donor_page_offset: page index on donor file
* @data_offset_in_page: block index where data swapping starts
* @block_len_in_page: the number of blocks to be swapped
* @unwritten: orig extent is unwritten or not
* @err: pointer to save return value
*
* Save the data in original inode blocks and replace original inode extents
- * with donor inode extents by calling mext_replace_branches().
+ * with donor inode extents by calling ext4_swap_extents().
* Finally, write out the saved data in new original inode blocks. Return
* replaced block count.
*/
@@ -551,41 +531,14 @@ mext_check_arguments(struct inode *orig_inode,
*
* @o_filp: file structure of the original file
* @d_filp: file structure of the donor file
- * @orig_start: start offset in block for orig
- * @donor_start: start offset in block for donor
+ * @orig_blk: start offset in block for orig
+ * @donor_blk: start offset in block for donor
* @len: the number of blocks to be moved
* @moved_len: moved block length
*
* This function returns 0 and moved block length is set in moved_len
* if succeed, otherwise returns error value.
*
- * Note: ext4_move_extents() proceeds the following order.
- * 1:ext4_move_extents() calculates the last block number of moving extent
- * function by the start block number (orig_start) and the number of blocks
- * to be moved (len) specified as arguments.
- * If the {orig, donor}_start points a hole, the extent's start offset
- * pointed by ext_cur (current extent), holecheck_path, orig_path are set
- * after hole behind.
- * 2:Continue step 3 to step 5, until the holecheck_path points to last_extent
- * or the ext_cur exceeds the block_end which is last logical block number.
- * 3:To get the length of continues area, call mext_next_extent()
- * specified with the ext_cur (initial value is holecheck_path) re-cursive,
- * until find un-continuous extent, the start logical block number exceeds
- * the block_end or the extent points to the last extent.
- * 4:Exchange the original inode data with donor inode data
- * from orig_page_offset to seq_end_page.
- * The start indexes of data are specified as arguments.
- * That of the original inode is orig_page_offset,
- * and the donor inode is also orig_page_offset
- * (To easily handle blocksize != pagesize case, the offset for the
- * donor inode is block unit).
- * 5:Update holecheck_path and orig_path to points a next proceeding extent,
- * then returns to step 2.
- * 6:Release holecheck_path, orig_path and set the len to moved_len
- * which shows the number of moved blocks.
- * The moved_len is useful for the command to calculate the file offset
- * for starting next move extent ioctl.
- * 7:Return 0 on success, or a negative error value on failure.
*/
int
ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
--
1.8.3.1
--
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