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Commit 8473aa8a authored by Tristan Ye's avatar Tristan Ye
Browse files

Ocfs2/move_extents: helpers to update the group descriptor and global bitmap inode. 



These helpers were actually borrowed from alloc.c, which may be publicized
later.

Signed-off-by: default avatarTristan Ye <tristan.ye@oracle.com>
parent e6b5859c

fs/ocfs2/move_extents.c

+77 −0
Original line number Diff line number Diff line
@@ -555,3 +555,80 @@ static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh, 


	mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos);

}



static int ocfs2_alloc_dinode_update_counts(struct inode *inode,

				       handle_t *handle,

				       struct buffer_head *di_bh,

				       u32 num_bits,

				       u16 chain)

{

	int ret;

	u32 tmp_used;

	struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;

	struct ocfs2_chain_list *cl =

				(struct ocfs2_chain_list *) &di->id2.i_chain;



	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,

				      OCFS2_JOURNAL_ACCESS_WRITE);

	if (ret < 0) {

		mlog_errno(ret);

		goto out;

	}



	tmp_used = le32_to_cpu(di->id1.bitmap1.i_used);

	di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used);

	le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits);

	ocfs2_journal_dirty(handle, di_bh);



out:

	return ret;

}



static inline int ocfs2_block_group_set_bits(handle_t *handle,

					     struct inode *alloc_inode,

					     struct ocfs2_group_desc *bg,

					     struct buffer_head *group_bh,

					     unsigned int bit_off,

					     unsigned int num_bits)

{

	int status;

	void *bitmap = bg->bg_bitmap;

	int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;



	/* All callers get the descriptor via

	 * ocfs2_read_group_descriptor().  Any corruption is a code bug. */

	BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg));

	BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);



	mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off,

	     num_bits);



	if (ocfs2_is_cluster_bitmap(alloc_inode))

		journal_type = OCFS2_JOURNAL_ACCESS_UNDO;



	status = ocfs2_journal_access_gd(handle,

					 INODE_CACHE(alloc_inode),

					 group_bh,

					 journal_type);

	if (status < 0) {

		mlog_errno(status);

		goto bail;

	}



	le16_add_cpu(&bg->bg_free_bits_count, -num_bits);

	if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) {

		ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit"

			    " count %u but claims %u are freed. num_bits %d",

			    (unsigned long long)le64_to_cpu(bg->bg_blkno),

			    le16_to_cpu(bg->bg_bits),

			    le16_to_cpu(bg->bg_free_bits_count), num_bits);

		return -EROFS;

	}

	while (num_bits--)

		ocfs2_set_bit(bit_off++, bitmap);



	ocfs2_journal_dirty(handle, group_bh);



bail:

	return status;

}