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ext4: add a function which sets up group blocks of a flex bg
This patch adds a function named setup_new_flex_group_blocks() which sets up group blocks of a flex bg. Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Yongqiang Yang
Theodore Ts'o
parent
28c7bac009
commit
33afdcc540
@ -511,6 +511,14 @@ struct ext4_new_group_data {
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__u32 free_blocks_count;
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};
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/* Indexes used to index group tables in ext4_new_group_data */
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enum {
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BLOCK_BITMAP = 0, /* block bitmap */
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INODE_BITMAP, /* inode bitmap */
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INODE_TABLE, /* inode tables */
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GROUP_TABLE_COUNT,
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};
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/*
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* Flags used by ext4_map_blocks()
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*/
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250
fs/ext4/resize.c
250
fs/ext4/resize.c
@ -233,6 +233,256 @@ static int extend_or_restart_transaction(handle_t *handle, int thresh)
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return 0;
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}
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/*
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* set_flexbg_block_bitmap() mark @count blocks starting from @block used.
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*
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* Helper function for ext4_setup_new_group_blocks() which set .
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*
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* @sb: super block
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* @handle: journal handle
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* @flex_gd: flex group data
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*/
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static int set_flexbg_block_bitmap(struct super_block *sb, handle_t *handle,
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struct ext4_new_flex_group_data *flex_gd,
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ext4_fsblk_t block, ext4_group_t count)
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{
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ext4_group_t count2;
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ext4_debug("mark blocks [%llu/%u] used\n", block, count);
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for (count2 = count; count > 0; count -= count2, block += count2) {
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ext4_fsblk_t start;
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struct buffer_head *bh;
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ext4_group_t group;
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int err;
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ext4_get_group_no_and_offset(sb, block, &group, NULL);
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start = ext4_group_first_block_no(sb, group);
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group -= flex_gd->groups[0].group;
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count2 = sb->s_blocksize * 8 - (block - start);
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if (count2 > count)
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count2 = count;
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if (flex_gd->bg_flags[group] & EXT4_BG_BLOCK_UNINIT) {
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BUG_ON(flex_gd->count > 1);
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continue;
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}
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err = extend_or_restart_transaction(handle, 1);
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if (err)
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return err;
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bh = sb_getblk(sb, flex_gd->groups[group].block_bitmap);
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if (!bh)
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return -EIO;
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err = ext4_journal_get_write_access(handle, bh);
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if (err)
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return err;
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ext4_debug("mark block bitmap %#04llx (+%llu/%u)\n", block,
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block - start, count2);
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ext4_set_bits(bh->b_data, block - start, count2);
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err = ext4_handle_dirty_metadata(handle, NULL, bh);
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if (unlikely(err))
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return err;
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brelse(bh);
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}
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return 0;
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}
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/*
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* Set up the block and inode bitmaps, and the inode table for the new groups.
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* This doesn't need to be part of the main transaction, since we are only
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* changing blocks outside the actual filesystem. We still do journaling to
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* ensure the recovery is correct in case of a failure just after resize.
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* If any part of this fails, we simply abort the resize.
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*
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* setup_new_flex_group_blocks handles a flex group as follow:
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* 1. copy super block and GDT, and initialize group tables if necessary.
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* In this step, we only set bits in blocks bitmaps for blocks taken by
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* super block and GDT.
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* 2. allocate group tables in block bitmaps, that is, set bits in block
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* bitmap for blocks taken by group tables.
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*/
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static int setup_new_flex_group_blocks(struct super_block *sb,
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struct ext4_new_flex_group_data *flex_gd)
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{
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int group_table_count[] = {1, 1, EXT4_SB(sb)->s_itb_per_group};
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ext4_fsblk_t start;
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ext4_fsblk_t block;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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struct ext4_super_block *es = sbi->s_es;
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struct ext4_new_group_data *group_data = flex_gd->groups;
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__u16 *bg_flags = flex_gd->bg_flags;
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handle_t *handle;
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ext4_group_t group, count;
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struct buffer_head *bh = NULL;
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int reserved_gdb, i, j, err = 0, err2;
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BUG_ON(!flex_gd->count || !group_data ||
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group_data[0].group != sbi->s_groups_count);
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reserved_gdb = le16_to_cpu(es->s_reserved_gdt_blocks);
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/* This transaction may be extended/restarted along the way */
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handle = ext4_journal_start_sb(sb, EXT4_MAX_TRANS_DATA);
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if (IS_ERR(handle))
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return PTR_ERR(handle);
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group = group_data[0].group;
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for (i = 0; i < flex_gd->count; i++, group++) {
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unsigned long gdblocks;
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gdblocks = ext4_bg_num_gdb(sb, group);
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start = ext4_group_first_block_no(sb, group);
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/* Copy all of the GDT blocks into the backup in this group */
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for (j = 0, block = start + 1; j < gdblocks; j++, block++) {
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struct buffer_head *gdb;
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ext4_debug("update backup group %#04llx\n", block);
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err = extend_or_restart_transaction(handle, 1);
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if (err)
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goto out;
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gdb = sb_getblk(sb, block);
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if (!gdb) {
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err = -EIO;
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goto out;
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}
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err = ext4_journal_get_write_access(handle, gdb);
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if (err) {
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brelse(gdb);
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goto out;
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}
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memcpy(gdb->b_data, sbi->s_group_desc[j]->b_data,
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gdb->b_size);
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set_buffer_uptodate(gdb);
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err = ext4_handle_dirty_metadata(handle, NULL, gdb);
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if (unlikely(err)) {
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brelse(gdb);
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goto out;
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}
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brelse(gdb);
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}
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/* Zero out all of the reserved backup group descriptor
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* table blocks
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*/
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if (ext4_bg_has_super(sb, group)) {
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err = sb_issue_zeroout(sb, gdblocks + start + 1,
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reserved_gdb, GFP_NOFS);
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if (err)
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goto out;
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}
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/* Initialize group tables of the grop @group */
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if (!(bg_flags[i] & EXT4_BG_INODE_ZEROED))
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goto handle_bb;
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/* Zero out all of the inode table blocks */
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block = group_data[i].inode_table;
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ext4_debug("clear inode table blocks %#04llx -> %#04lx\n",
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block, sbi->s_itb_per_group);
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err = sb_issue_zeroout(sb, block, sbi->s_itb_per_group,
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GFP_NOFS);
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if (err)
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goto out;
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handle_bb:
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if (bg_flags[i] & EXT4_BG_BLOCK_UNINIT)
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goto handle_ib;
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/* Initialize block bitmap of the @group */
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block = group_data[i].block_bitmap;
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err = extend_or_restart_transaction(handle, 1);
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if (err)
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goto out;
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bh = bclean(handle, sb, block);
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if (IS_ERR(bh)) {
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err = PTR_ERR(bh);
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goto out;
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}
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if (ext4_bg_has_super(sb, group)) {
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ext4_debug("mark backup superblock %#04llx (+0)\n",
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start);
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ext4_set_bits(bh->b_data, 0, gdblocks + reserved_gdb +
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1);
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}
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ext4_mark_bitmap_end(group_data[i].blocks_count,
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sb->s_blocksize * 8, bh->b_data);
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err = ext4_handle_dirty_metadata(handle, NULL, bh);
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if (err)
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goto out;
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brelse(bh);
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handle_ib:
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if (bg_flags[i] & EXT4_BG_INODE_UNINIT)
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continue;
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/* Initialize inode bitmap of the @group */
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block = group_data[i].inode_bitmap;
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err = extend_or_restart_transaction(handle, 1);
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if (err)
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goto out;
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/* Mark unused entries in inode bitmap used */
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bh = bclean(handle, sb, block);
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if (IS_ERR(bh)) {
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err = PTR_ERR(bh);
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goto out;
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}
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ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb),
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sb->s_blocksize * 8, bh->b_data);
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err = ext4_handle_dirty_metadata(handle, NULL, bh);
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if (err)
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goto out;
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brelse(bh);
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}
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bh = NULL;
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/* Mark group tables in block bitmap */
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for (j = 0; j < GROUP_TABLE_COUNT; j++) {
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count = group_table_count[j];
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start = (&group_data[0].block_bitmap)[j];
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block = start;
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for (i = 1; i < flex_gd->count; i++) {
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block += group_table_count[j];
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if (block == (&group_data[i].block_bitmap)[j]) {
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count += group_table_count[j];
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continue;
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}
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err = set_flexbg_block_bitmap(sb, handle,
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flex_gd, start, count);
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if (err)
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goto out;
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count = group_table_count[j];
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start = group_data[i].block_bitmap;
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block = start;
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}
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if (count) {
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err = set_flexbg_block_bitmap(sb, handle,
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flex_gd, start, count);
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if (err)
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goto out;
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}
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}
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out:
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brelse(bh);
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err2 = ext4_journal_stop(handle);
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if (err2 && !err)
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err = err2;
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return err;
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}
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/*
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* Set up the block and inode bitmaps, and the inode table for the new group.
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* This doesn't need to be part of the main transaction, since we are only
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