On Tue, Aug 12, 2008 at 09:25:54AM -0700, Mingming Cao wrote:
....
> - * and dindirect block, and the "5" above becomes "3".
> + * Also account for superblock, inode, quota and xattr blocks
> + */
> +int ext4_meta_trans_blocks(struct inode* inode, int nrblocks, int idxblocks)
> +{
> + int groups, gdpblocks;
> + int ret = 0;
> +
> + groups = nrblocks + idxblocks;
> + gdpblocks = groups;
> + if (groups > EXT4_SB(inode->i_sb)->s_groups_count)
> + groups = EXT4_SB(inode->i_sb)->s_groups_count;
> + if (groups > EXT4_SB(inode->i_sb)->s_gdb_count)
> + gdpblocks = EXT4_SB(inode->i_sb)->s_gdb_count;
> +
> + /* bitmaps and block group descriptor blocks */
> + ret += groups + gdpblocks;
ret = groups + gdpblocks;
> +
> + ret += idxblocks;
> +
> + /* journalled mode, include buffer to modify data blocks */
> + if (ext4_should_journal_data(inode))
> + ret += nrblocks;
> +
> + /* Blocks for super block, inode, quota and xattr blocks */
> + ret += EXT4_META_TRANS_BLOCKS(inode->i_sb);
> +
> + return ret;
> +}
> +
> +static int ext4_indirect_trans_blocks(struct inode *inode, int nrblocks,
> + int chunk)
> +{
.....
.....
>
> +/*
> + * Define the number of metadata blocks we need to account to modify data.
> + *
> + * This include super block, inode block, quota blocks and xattr blocks
> + */
> +#define EXT4_META_TRANS_BLOCKS(sb) (EXT4_XATTR_TRANS_BLOCKS + \
> + 2*EXT4_QUOTA_TRANS_BLOCKS(sb))
> +
Do EXT4_XATTR_TRANS_BLOCKS blocks really account for super block
and inode block ? Looking at EXT4_DATA_TRANS_BLOCKS which also use
EXT4_XATTR_TRANS_BLOCKS I think it doesn't. But the comment above
EXT4_XATTR_TRANS_BLOCKS is confusing. I guess we would need a +2 here.
-aneesh
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