[lustre-devel] [PATCH 13/22] ext4: Add a proc interface for max_dir_size.

[NeilBrown <neilb@suse.com>]

On Sun, Jul 21 2019, James Simmons wrote:

> Signed-off-by: James Simmons <jsimmons@infradead.org>
> ---
>  fs/ext4/sysfs.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
> index 1375815..3a71a16 100644
> --- a/fs/ext4/sysfs.c
> +++ b/fs/ext4/sysfs.c
> @@ -180,6 +180,8 @@ static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
>  EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, inode_readahead,
>  		 ext4_sb_info, s_inode_readahead_blks);
>  EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
> +EXT4_RW_ATTR_SBI_UI(max_dir_size, s_max_dir_size_kb);
> +EXT4_RW_ATTR_SBI_UI(max_dir_size_kb, s_max_dir_size_kb);

Why do we need both?


>  EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
>  EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
>  EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
> @@ -210,6 +212,8 @@ static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
>  	ATTR_LIST(reserved_clusters),
>  	ATTR_LIST(inode_readahead_blks),
>  	ATTR_LIST(inode_goal),
> +	ATTR_LIST(max_dir_size),
> +	ATTR_LIST(max_dir_size_kb),
>  	ATTR_LIST(mb_stats),
>  	ATTR_LIST(mb_max_to_scan),
>  	ATTR_LIST(mb_min_to_scan),
> @@ -350,6 +354,8 @@ static ssize_t ext4_attr_store(struct kobject *kobj,
>  		ret = kstrtoul(skip_spaces(buf), 0, &t);
>  		if (ret)
>  			return ret;
> +		if (strcmp("max_dir_size", a->attr.name) == 0)
> +			t >>= 10;

Give that the attrs are read/write, surely we need a <<= 10 in the read
path too??

NeilBrown


>  		if (a->attr_ptr == ptr_ext4_super_block_offset)
>  			*((__le32 *) ptr) = cpu_to_le32(t);
>  		else
> -- 
> 1.8.3.1
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