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Date:	Thu, 11 Aug 2011 18:57:24 +0800
From:	Steven Liu <lingjiujianke@...il.com>
To:	Yongqiang Yang <xiaoqiangnk@...il.com>
Cc:	linux-ext4@...r.kernel.org, aedilger@...il.com, tytso@....edu
Subject: Re: [PATCH 05/13] ext4: add a structure which will be used by
 64bit-resize interface

TO: Yongqiang

2011/8/11 Yongqiang Yang <xiaoqiangnk@...il.com>:
> This patch adds a structure which will be used by 64bit-resize interface.
> Two functions which allocate and destroy the structure respectively are
> added.
>
> Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>
> ---
>  fs/ext4/resize.c |   56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 56 insertions(+), 0 deletions(-)
>
> diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
> index 14be865..c586e51 100644
> --- a/fs/ext4/resize.c
> +++ b/fs/ext4/resize.c
> @@ -134,6 +134,62 @@ static int verify_group_input(struct super_block *sb,
>        return err;
>  }
>
> +/*
> + * ext4_new_flex_group_data is used by 64bit-resize interface to add a flex
> + * group each time.
> + */
> +struct ext4_new_flex_group_data {
> +       struct ext4_new_group_data *groups;     /* new_group_data for groups
> +                                                  in the flex group */
> +       __u16 *bg_flags;                        /* block group flags of groups
> +                                                  in @groups */
> +       ext4_group_t count;                     /* number of groups in @groups
> +                                                */
> +};
> +
> +/*
> + * alloc_flex_gd() allocates a ext4_new_flex_group_data with size of
> + * @flexbg_size.
> + *
> + * Returns NULL on failure otherwise address of the allocated structure.
> + */
> +static struct ext4_new_flex_group_data *alloc_flex_gd(unsigned long flexbg_size)
> +{
> +       struct ext4_new_flex_group_data *flex_gd;
> +
> +       flex_gd = kmalloc(sizeof(*flex_gd), GFP_NOFS);
> +       if (flex_gd == NULL) {
                    printk( KERN_WARNING "not enough memory for flex_gd\n" );
> +               goto out3;
             }
> +
> +       flex_gd->count = flexbg_size;
> +
> +       flex_gd->groups = kmalloc(sizeof(struct ext4_new_group_data) *
> +                                 flexbg_size, GFP_NOFS);
> +       if (flex_gd->groups == NULL) {
                    printk( KERN_WARNING "not enough memory for
flex_gd->groups\n" );
> +               goto out2;
            }
> +
> +       flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS);
> +       if (flex_gd->bg_flags == NULL) {
                    printk( KERN_WARNING "not enough memory for
flex_gd->bg_flags\n" );
> +               goto out1;
             }
> +
> +       return flex_gd;
> +
out1:
     kfree(flex_gd->groups);
> +out2:
> +       kfree(flex_gd);
 out3:
> +       return NULL;
> +}
> +
> +void free_flex_gd(struct ext4_new_flex_group_data *flex_gd)
> +{
> +       kfree(flex_gd->bg_flags);
> +       kfree(flex_gd->groups);
> +       kfree(flex_gd);
> +}
> +
>  static struct buffer_head *bclean(handle_t *handle, struct super_block *sb,
>                                  ext4_fsblk_t blk)
>  {



What about add some message for kmalloc failure, and  goto the label
looks like the above ?
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