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Message-ID: <8248d9f2-b758-21cb-5cd8-30bba2bb9137@virtuozzo.com>
Date: Tue, 6 Nov 2018 09:24:38 +0300
From: Vasily Averin <vvs@...tuozzo.com>
To: linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
Andreas Dilger <adilger.kernel@...ger.ca>
Cc: linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4: remove code duplication in free_ind_block()
btw I have few related questions:
1) extend_credit_for_blkdel() can return error but its return code is not checked,
neither here nor in all other places. Could somebody clarify, is it normal?
2) there is similar function free_ext_idx(). After internal failures it calls
extend_credit_for_blkdel() and ext4_free_blocks().
In the same situation free_ind_blocks() returns without calling of these functions.
Is it OK?
Thank you,
Vasily Averin
On 11/6/18 9:13 AM, Vasily Averin wrote:
> free_ind_block(), free_dind_blocks() and free_tind_blocks() are replaced
> by a single recursive function.
>
> Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
> ---
> fs/ext4/migrate.c | 115 +++++++++++++---------------------------------
> 1 file changed, 32 insertions(+), 83 deletions(-)
>
> diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
> index 224e136d1c10..754f172b18d4 100644
> --- a/fs/ext4/migrate.c
> +++ b/fs/ext4/migrate.c
> @@ -157,100 +157,43 @@ static int extend_credit_for_blkdel(handle_t *handle, struct inode *inode)
> return retval;
> }
>
> -static int free_dind_blocks(handle_t *handle,
> - struct inode *inode, __le32 i_data)
> +static int free_ind_blocks(handle_t *handle,
> + struct inode *inode, __le32 i_data, int ind)
> {
> - int i;
> - __le32 *tmp_idata;
> - struct buffer_head *bh;
> - unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
> -
> - bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
> - if (!bh)
> - return -EIO;
> -
> - tmp_idata = (__le32 *)bh->b_data;
> - for (i = 0; i < max_entries; i++) {
> - if (tmp_idata[i]) {
> - extend_credit_for_blkdel(handle, inode);
> - ext4_free_blocks(handle, inode, NULL,
> - le32_to_cpu(tmp_idata[i]), 1,
> - EXT4_FREE_BLOCKS_METADATA |
> - EXT4_FREE_BLOCKS_FORGET);
> - }
> - }
> - put_bh(bh);
> - extend_credit_for_blkdel(handle, inode);
> - ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
> - EXT4_FREE_BLOCKS_METADATA |
> - EXT4_FREE_BLOCKS_FORGET);
> - return 0;
> -}
> -
> -static int free_tind_blocks(handle_t *handle,
> - struct inode *inode, __le32 i_data)
> -{
> - int i, retval = 0;
> - __le32 *tmp_idata;
> - struct buffer_head *bh;
> - unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
> -
> - bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
> - if (!bh)
> - return -EIO;
> -
> - tmp_idata = (__le32 *)bh->b_data;
> - for (i = 0; i < max_entries; i++) {
> - if (tmp_idata[i]) {
> - retval = free_dind_blocks(handle,
> - inode, tmp_idata[i]);
> - if (retval) {
> - put_bh(bh);
> - return retval;
> + if (ind > 0) {
> + int retval = 0;
> + __le32 *tmp_idata;
> + ext4_lblk_t i, max_entries;
> + struct buffer_head *bh;
> +
> + bh = sb_bread(inode->i_sb, le32_to_cpu(i_data));
> + if (!bh)
> + return -EIO;
> +
> + tmp_idata = (__le32 *)bh->b_data;
> + max_entries = inode->i_sb->s_blocksize >> 2;
> + for (i = 0; i < max_entries; i++) {
> + if (tmp_idata[i]) {
> + retval = free_ind_blocks(handle,
> + inode, tmp_idata[i], ind - 1);
> + if (retval) {
> + put_bh(bh);
> + return retval;
> + }
> }
> }
> + put_bh(bh);
> }
> - put_bh(bh);
> extend_credit_for_blkdel(handle, inode);
> ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1,
> - EXT4_FREE_BLOCKS_METADATA |
> - EXT4_FREE_BLOCKS_FORGET);
> - return 0;
> -}
> -
> -static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data)
> -{
> - int retval;
> -
> - /* ei->i_data[EXT4_IND_BLOCK] */
> - if (i_data[0]) {
> - extend_credit_for_blkdel(handle, inode);
> - ext4_free_blocks(handle, inode, NULL,
> - le32_to_cpu(i_data[0]), 1,
> - EXT4_FREE_BLOCKS_METADATA |
> - EXT4_FREE_BLOCKS_FORGET);
> - }
> -
> - /* ei->i_data[EXT4_DIND_BLOCK] */
> - if (i_data[1]) {
> - retval = free_dind_blocks(handle, inode, i_data[1]);
> - if (retval)
> - return retval;
> - }
> -
> - /* ei->i_data[EXT4_TIND_BLOCK] */
> - if (i_data[2]) {
> - retval = free_tind_blocks(handle, inode, i_data[2]);
> - if (retval)
> - return retval;
> - }
> + EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
> return 0;
> }
>
> static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
> struct inode *tmp_inode)
> {
> - int retval;
> + int i, retval;
> __le32 i_data[3];
> struct ext4_inode_info *ei = EXT4_I(inode);
> struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode);
> @@ -307,7 +250,13 @@ static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode,
> * We mark the inode dirty after, because we decrement the
> * i_blocks when freeing the indirect meta-data blocks
> */
> - retval = free_ind_block(handle, inode, i_data);
> + for (i = 0; i < ARRAY_SIZE(i_data); i++) {
> + if (i_data[i]) {
> + retval = free_ind_blocks(handle, inode, i_data[i], i);
> + if (retval)
> + break;
> + }
> + }
> ext4_mark_inode_dirty(handle, inode);
>
> err_out:
>
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