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Date: Mon, 27 May 2019 09:07:34 +0300
From: Vasily Averin <vvs@...tuozzo.com>
To: Theodore Ts'o <tytso@....edu>
Cc: Andreas Dilger <adilger@...ger.ca>,
Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v3] ext4: remove code duplication in
update_ind/bind/tind_extent_range
Dear Ted,
could you please clarify status of this patch
(and "[PATCH v2] ext4: remove code duplication in free_ind_block()" as well) ?
Do you probably have some objections, should I re-make or re-base or re-send them again?
Thank you,
Vasily Averin
On 3/14/19 3:31 AM, Andreas Dilger wrote:
> 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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