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Message-ID: <ZF3ejB3W6UCp9/MZ@li-bb2b2a4c-3307-11b2-a85c-8fa5c3a69313.ibm.com>
Date: Fri, 12 May 2023 12:07:00 +0530
From: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
To: Kemeng Shi <shikemeng@...weicloud.com>
Cc: tytso@....edu, adilger.kernel@...ger.ca,
linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 09/19] ext4: remove unsed parameter and unnecessary
forward declaration of ext4_mb_new_blocks_simple
On Mon, Apr 17, 2023 at 07:06:07PM +0800, Kemeng Shi wrote:
> Two cleanups for ext4_mb_new_blocks_simple:
> Remove unsed parameter handle of ext4_mb_new_blocks_simple.
> Move ext4_mb_new_blocks_simple definition before ext4_mb_new_blocks to
> remove unnecessary forward declaration of ext4_mb_new_blocks_simple.
>
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
Feel free to add:
Reviewed-by: Ojaswin Mujoo <ojaswin@...ux.ibm.com>
> ---
> fs/ext4/mballoc.c | 137 +++++++++++++++++++++++-----------------------
> 1 file changed, 67 insertions(+), 70 deletions(-)
>
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index f37e921c11e5..774f969b39d8 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -5729,8 +5729,72 @@ static bool ext4_mb_discard_preallocations_should_retry(struct super_block *sb,
> return ret;
> }
>
> -static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
> - struct ext4_allocation_request *ar, int *errp);
> +/*
> + * Simple allocator for Ext4 fast commit replay path. It searches for blocks
> + * linearly starting at the goal block and also excludes the blocks which
> + * are going to be in use after fast commit replay.
> + */
> +static ext4_fsblk_t
> +ext4_mb_new_blocks_simple(struct ext4_allocation_request *ar, int *errp)
> +{
> + struct buffer_head *bitmap_bh;
> + struct super_block *sb = ar->inode->i_sb;
> + struct ext4_sb_info *sbi = EXT4_SB(sb);
> + ext4_group_t group, nr;
> + ext4_grpblk_t blkoff;
> + ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb);
> + ext4_grpblk_t i = 0;
> + ext4_fsblk_t goal, block;
> + struct ext4_super_block *es = EXT4_SB(sb)->s_es;
> +
> + goal = ar->goal;
> + if (goal < le32_to_cpu(es->s_first_data_block) ||
> + goal >= ext4_blocks_count(es))
> + goal = le32_to_cpu(es->s_first_data_block);
> +
> + ar->len = 0;
> + ext4_get_group_no_and_offset(sb, goal, &group, &blkoff);
> + for (nr = ext4_get_groups_count(sb); nr > 0; nr--) {
> + bitmap_bh = ext4_read_block_bitmap(sb, group);
> + if (IS_ERR(bitmap_bh)) {
> + *errp = PTR_ERR(bitmap_bh);
> + pr_warn("Failed to read block bitmap\n");
> + return 0;
> + }
> +
> + while (1) {
> + i = mb_find_next_zero_bit(bitmap_bh->b_data, max,
> + blkoff);
> + if (i >= max)
> + break;
> + if (ext4_fc_replay_check_excluded(sb,
> + ext4_group_first_block_no(sb, group) +
> + EXT4_C2B(sbi, i))) {
> + blkoff = i + 1;
> + } else
> + break;
> + }
> + brelse(bitmap_bh);
> + if (i < max)
> + break;
> +
> + if (++group >= ext4_get_groups_count(sb))
> + group = 0;
> +
> + blkoff = 0;
> + }
> +
> + if (i >= max) {
> + *errp = -ENOSPC;
> + return 0;
> + }
> +
> + block = ext4_group_first_block_no(sb, group) + EXT4_C2B(sbi, i);
> + ext4_mb_mark_bb(sb, block, 1, 1);
> + ar->len = 1;
> +
> + return block;
> +}
>
> /*
> * Main entry point into mballoc to allocate blocks
> @@ -5755,7 +5819,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
>
> trace_ext4_request_blocks(ar);
> if (sbi->s_mount_state & EXT4_FC_REPLAY)
> - return ext4_mb_new_blocks_simple(handle, ar, errp);
> + return ext4_mb_new_blocks_simple(ar, errp);
>
> /* Allow to use superuser reservation for quota file */
> if (ext4_is_quota_file(ar->inode))
> @@ -5979,73 +6043,6 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b,
> spin_unlock(&sbi->s_md_lock);
> }
>
> -/*
> - * Simple allocator for Ext4 fast commit replay path. It searches for blocks
> - * linearly starting at the goal block and also excludes the blocks which
> - * are going to be in use after fast commit replay.
> - */
> -static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
> - struct ext4_allocation_request *ar, int *errp)
> -{
> - struct buffer_head *bitmap_bh;
> - struct super_block *sb = ar->inode->i_sb;
> - struct ext4_sb_info *sbi = EXT4_SB(sb);
> - ext4_group_t group, nr;
> - ext4_grpblk_t blkoff;
> - ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb);
> - ext4_grpblk_t i = 0;
> - ext4_fsblk_t goal, block;
> - struct ext4_super_block *es = EXT4_SB(sb)->s_es;
> -
> - goal = ar->goal;
> - if (goal < le32_to_cpu(es->s_first_data_block) ||
> - goal >= ext4_blocks_count(es))
> - goal = le32_to_cpu(es->s_first_data_block);
> -
> - ar->len = 0;
> - ext4_get_group_no_and_offset(sb, goal, &group, &blkoff);
> - for (nr = ext4_get_groups_count(sb); nr > 0; nr--) {
> - bitmap_bh = ext4_read_block_bitmap(sb, group);
> - if (IS_ERR(bitmap_bh)) {
> - *errp = PTR_ERR(bitmap_bh);
> - pr_warn("Failed to read block bitmap\n");
> - return 0;
> - }
> -
> - while (1) {
> - i = mb_find_next_zero_bit(bitmap_bh->b_data, max,
> - blkoff);
> - if (i >= max)
> - break;
> - if (ext4_fc_replay_check_excluded(sb,
> - ext4_group_first_block_no(sb, group) +
> - EXT4_C2B(sbi, i))) {
> - blkoff = i + 1;
> - } else
> - break;
> - }
> - brelse(bitmap_bh);
> - if (i < max)
> - break;
> -
> - if (++group >= ext4_get_groups_count(sb))
> - group = 0;
> -
> - blkoff = 0;
> - }
> -
> - if (i >= max) {
> - *errp = -ENOSPC;
> - return 0;
> - }
> -
> - block = ext4_group_first_block_no(sb, group) + EXT4_C2B(sbi, i);
> - ext4_mb_mark_bb(sb, block, 1, 1);
> - ar->len = 1;
> -
> - return block;
> -}
> -
> static void ext4_free_blocks_simple(struct inode *inode, ext4_fsblk_t block,
> unsigned long count)
> {
> --
> 2.30.0
>
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