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Date: Wed, 13 Mar 2019 18:31:01 -0600
From: Andreas Dilger <adilger@...ger.ca>
To: Vasily Averin <vvs@...tuozzo.com>
Cc: Theodore Ts'o <tytso@....edu>,
Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v3] ext4: remove code duplication in
update_ind/bind/tind_extent_range
On Mar 12, 2019, at 7:09 AM, Vasily Averin <vvs@...tuozzo.com> wrote:
>
> update_ind/bind/tind_extent_page() differs by one variable and can be
> replaced by unified function. These functions are called by similar way
> and their caller function can be simplified too.
>
> v2: minor style changes, thanks to Andreas Dilger
> v3: rebase to v5.0
>
> Signed-off-by: Vasily Averin <vvs@...tuozzo.com>
Always good to see patches that remove more lines than they add.
Reviewed-by: Andreas Dilger <adilger@...ger.ca>
> ---
> fs/ext4/migrate.c | 112 ++++++++++------------------------------------
> 1 file changed, 24 insertions(+), 88 deletions(-)
>
> diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
> index b1e4d359f73b..fde2f1bc96b0 100644
> --- a/fs/ext4/migrate.c
> +++ b/fs/ext4/migrate.c
> @@ -109,12 +109,13 @@ static int update_extent_range(handle_t *handle, struct inode *inode,
>
> static int update_ind_extent_range(handle_t *handle, struct inode *inode,
> ext4_fsblk_t pblock,
> - struct migrate_struct *lb)
> + struct migrate_struct *lb,
> + ext4_lblk_t inc)
> {
> struct buffer_head *bh;
> __le32 *i_data;
> int i, retval = 0;
> - unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
> + ext4_lblk_t max_entries = inode->i_sb->s_blocksize >> 2;
>
> bh = ext4_sb_bread(inode->i_sb, pblock, 0);
> if (IS_ERR(bh))
> @@ -128,67 +129,7 @@ static int update_ind_extent_range(handle_t *handle, struct inode *inode,
> if (retval)
> break;
> } else {
> - lb->curr_block++;
> - }
> - }
> - put_bh(bh);
> - return retval;
> -
> -}
> -
> -static int update_dind_extent_range(handle_t *handle, struct inode *inode,
> - ext4_fsblk_t pblock,
> - struct migrate_struct *lb)
> -{
> - struct buffer_head *bh;
> - __le32 *i_data;
> - int i, retval = 0;
> - unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
> -
> - bh = ext4_sb_bread(inode->i_sb, pblock, 0);
> - if (IS_ERR(bh))
> - return PTR_ERR(bh);
> -
> - i_data = (__le32 *)bh->b_data;
> - for (i = 0; i < max_entries; i++) {
> - if (i_data[i]) {
> - retval = update_ind_extent_range(handle, inode,
> - le32_to_cpu(i_data[i]), lb);
> - if (retval)
> - break;
> - } else {
> - /* Only update the file block number */
> - lb->curr_block += max_entries;
> - }
> - }
> - put_bh(bh);
> - return retval;
> -
> -}
> -
> -static int update_tind_extent_range(handle_t *handle, struct inode *inode,
> - ext4_fsblk_t pblock,
> - struct migrate_struct *lb)
> -{
> - struct buffer_head *bh;
> - __le32 *i_data;
> - int i, retval = 0;
> - unsigned long max_entries = inode->i_sb->s_blocksize >> 2;
> -
> - bh = ext4_sb_bread(inode->i_sb, pblock, 0);
> - if (IS_ERR(bh))
> - return PTR_ERR(bh);
> -
> - i_data = (__le32 *)bh->b_data;
> - for (i = 0; i < max_entries; i++) {
> - if (i_data[i]) {
> - retval = update_dind_extent_range(handle, inode,
> - le32_to_cpu(i_data[i]), lb);
> - if (retval)
> - break;
> - } else {
> - /* Only update the file block number */
> - lb->curr_block += max_entries * max_entries;
> + lb->curr_block += inc;
> }
> }
> put_bh(bh);
> @@ -433,7 +374,7 @@ int ext4_ext_migrate(struct inode *inode)
> struct ext4_inode_info *ei;
> struct inode *tmp_inode = NULL;
> struct migrate_struct lb;
> - unsigned long max_entries;
> + ext4_lblk_t max_entries, inc, mult;
> __u32 goal;
> uid_t owner[2];
>
> @@ -523,34 +464,29 @@ int ext4_ext_migrate(struct inode *inode)
>
> /* 32 bit block address 4 bytes */
> max_entries = inode->i_sb->s_blocksize >> 2;
> - for (i = 0; i < EXT4_NDIR_BLOCKS; i++) {
> +
> + inc = 1; mult = 1;
> + for (i = 0; i < EXT4_N_BLOCKS; i++) {
> + inc *= mult;
> + if (i == EXT4_IND_BLOCK)
> + mult = max_entries;
> +
> if (i_data[i]) {
> - retval = update_extent_range(handle, tmp_inode,
> + if (i < EXT4_IND_BLOCK)
> + retval = update_extent_range(handle, tmp_inode,
> le32_to_cpu(i_data[i]), &lb);
> + else
> + retval = update_ind_extent_range(handle,
> + tmp_inode,
> + le32_to_cpu(i_data[i]),
> + &lb, inc);
> if (retval)
> goto err_out;
> - } else
> - lb.curr_block++;
> - }
> - if (i_data[EXT4_IND_BLOCK]) {
> - retval = update_ind_extent_range(handle, tmp_inode,
> - le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb);
> - if (retval)
> - goto err_out;
> - } else
> - lb.curr_block += max_entries;
> - if (i_data[EXT4_DIND_BLOCK]) {
> - retval = update_dind_extent_range(handle, tmp_inode,
> - le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb);
> - if (retval)
> - goto err_out;
> - } else
> - lb.curr_block += max_entries * max_entries;
> - if (i_data[EXT4_TIND_BLOCK]) {
> - retval = update_tind_extent_range(handle, tmp_inode,
> - le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb);
> - if (retval)
> - goto err_out;
> +
> + } else {
> + if (i < EXT4_TIND_BLOCK)
> + lb.curr_block += inc * mult;
> + }
> }
> /*
> * Build the last extent
> --
> 2.17.1
>
Cheers, Andreas
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