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Commit 18e31438 authored by Yongqiang Yang's avatar Yongqiang Yang Committed by Theodore Ts'o
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ext4: add a function which extends a group without checking parameters 



This patch added a function named ext4_group_extend_no_check() whose code
is copied from ext4_group_extend().  ext4_group_extend_no_check() assumes
the parameter is valid and has been checked by caller.

Signed-off-by: default avatarYongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 597d508c

fs/ext4/resize.c

+51 −0
Original line number Diff line number Diff line
@@ -968,6 +968,57 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input) 
	return err;

} /* ext4_group_add */



/*

 * extend a group without checking assuming that checking has been done.

 */

static int ext4_group_extend_no_check(struct super_block *sb,

				      ext4_fsblk_t o_blocks_count, ext4_grpblk_t add)

{

	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

	handle_t *handle;

	int err = 0, err2;



	/* We will update the superblock, one block bitmap, and

	 * one group descriptor via ext4_group_add_blocks().

	 */

	handle = ext4_journal_start_sb(sb, 3);

	if (IS_ERR(handle)) {

		err = PTR_ERR(handle);

		ext4_warning(sb, "error %d on journal start", err);

		return err;

	}



	err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh);

	if (err) {

		ext4_warning(sb, "error %d on journal write access", err);

		goto errout;

	}



	ext4_blocks_count_set(es, o_blocks_count + add);

	ext4_debug("freeing blocks %llu through %llu\n", o_blocks_count,

		   o_blocks_count + add);

	/* We add the blocks to the bitmap and set the group need init bit */

	err = ext4_group_add_blocks(handle, sb, o_blocks_count, add);

	if (err)

		goto errout;

	ext4_handle_dirty_super(handle, sb);

	ext4_debug("freed blocks %llu through %llu\n", o_blocks_count,

		   o_blocks_count + add);

errout:

	err2 = ext4_journal_stop(handle);

	if (err2 && !err)

		err = err2;



	if (!err) {

		if (test_opt(sb, DEBUG))

			printk(KERN_DEBUG "EXT4-fs: extended group to %llu "

			       "blocks\n", ext4_blocks_count(es));

		update_backups(sb, EXT4_SB(sb)->s_sbh->b_blocknr, (char *)es,

			       sizeof(struct ext4_super_block));

	}

	return err;

}



/*

 * Extend the filesystem to the new number of blocks specified.  This entry

 * point is only used to extend the current filesystem to the end of the last