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Commit 28c7bac0 authored by Yongqiang Yang's avatar Yongqiang Yang Committed by Theodore Ts'o
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ext4: add a structure which will be used by 64bit-resize interface 



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: default avatarYongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent bb08c1e7

fs/ext4/resize.c

+55 −0
Original line number Diff line number Diff line
@@ -134,6 +134,61 @@ 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)

		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)

		goto out2;



	flex_gd->bg_flags = kmalloc(flexbg_size * sizeof(__u16), GFP_NOFS);

	if (flex_gd->bg_flags == NULL)

		goto out1;



	return flex_gd;



out1:

	kfree(flex_gd->groups);

out2:

	kfree(flex_gd);

out3:

	return NULL;

}



static 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)

{