This patch adds a function named ext4_setup_new_desc() which sets
up a new group descriptor and whose code is sopied from ext4_group_add().
The function will be used by new resize implementation.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@xxxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
---
fs/ext4/resize.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index 7e8cd6e..0bc7a08 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -777,6 +777,61 @@ out:
return err;
}
+/*
+ * ext4_setup_new_desc() sets up group descriptors specified by @input.
+ *
+ * @handle: journal handle
+ * @sb: super block
+ */
+static int ext4_setup_new_desc(handle_t *handle, struct super_block *sb,
+ struct ext4_new_group_data *input)
+{
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
+ ext4_group_t group;
+ struct ext4_group_desc *gdp;
+ struct buffer_head *gdb_bh;
+ int gdb_off, gdb_num, err = 0;
+
+ group = input->group;
+
+ gdb_off = group % EXT4_DESC_PER_BLOCK(sb);
+ gdb_num = group / EXT4_DESC_PER_BLOCK(sb);
+
+ /*
+ * get_write_access() has been called on gdb_bh by ext4_add_new_desc().
+ */
+ gdb_bh = sbi->s_group_desc[gdb_num];
+ /* Update group descriptor block for new group */
+ gdp = (struct ext4_group_desc *)((char *)gdb_bh->b_data +
+ gdb_off * EXT4_DESC_SIZE(sb));
+
+ memset(gdp, 0, EXT4_DESC_SIZE(sb));
+ /* LV FIXME */
+ memset(gdp, 0, EXT4_DESC_SIZE(sb));
+ ext4_block_bitmap_set(sb, gdp, input->block_bitmap); /* LV FIXME */
+ ext4_inode_bitmap_set(sb, gdp, input->inode_bitmap); /* LV FIXME */
+ ext4_inode_table_set(sb, gdp, input->inode_table); /* LV FIXME */
+ ext4_free_group_clusters_set(sb, gdp,
+ EXT4_B2C(sbi, input->free_blocks_count));
+ ext4_free_inodes_set(sb, gdp, EXT4_INODES_PER_GROUP(sb));
+ gdp->bg_flags = cpu_to_le16(EXT4_BG_INODE_ZEROED);
+ gdp->bg_checksum = ext4_group_desc_csum(sbi, input->group, gdp);
+
+ err = ext4_handle_dirty_metadata(handle, NULL, gdb_bh);
+ if (unlikely(err)) {
+ ext4_std_error(sb, err);
+ return err;
+ }
+
+ /*
+ * We can allocate memory for mb_alloc based on the new group
+ * descriptor
+ */
+ err = ext4_mb_add_groupinfo(sb, group, gdp);
+
+ return err;
+}
+
/* Add group descriptor data to an existing or new group descriptor block.
* Ensure we handle all possible error conditions _before_ we start modifying
* the filesystem, because we cannot abort the transaction and not have it
--
1.7.5.1
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