On Oct 12, 2007 10:06 +0530, Aneesh Kumar K.V wrote:
> We add a RO_COMPAT feature to the super
> block to indicate that some of the inode have i_blocks
> represented as file system block size units. Super block
> with this feature set cannot be mounted read write on a kernel
> with CONFIG_LSF disabled.
>
> Super block flag EXT4_FEATURE_RO_COMPAT_HUGE_FILE
> inode flag EXT4_HUGE_FILE_FL
I was wondering where this part of the patch went...
> @@ -2905,10 +2912,32 @@ static int ext4_inode_blocks_set(handle_t *handle,
> /* i_block is stored in the split 48 bit fields */
> raw_inode->i_blocks_lo = cpu_to_le32((u32)i_blocks);
> raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
I don't think we need to cast (u32) here, since cpu_to_le32() should do
that already?
> + } else {
> + /*
> + * i_blocks should be represented in a 48 bit variable
> + * as multiple of file system block size
> + */
> + if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
> + EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
> +
> + err = ext4_journal_get_write_access(handle,
> + EXT4_SB(sb)->s_sbh);
> + if (err)
> + goto err_out;
> + ext4_update_dynamic_rev(sb);
> + EXT4_SET_RO_COMPAT_FEATURE(sb,
> + EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
> + sb->s_dirt = 1;
> + handle->h_sync = 1;
> + err = ext4_journal_dirty_metadata(handle,
> + EXT4_SB(sb)->s_sbh);
> + }
> + ei->i_flags |= EXT4_HUGE_FILE_FL;
> + /* i_block is stored in file system block size */
> + i_blocks = i_blocks >> (inode->i_blkbits - 9);
> + raw_inode->i_blocks_lo = cpu_to_le32((u32)i_blocks);
> + raw_inode->i_blocks_high = cpu_to_le16(i_blocks >> 32);
> }
This "else" clause is a LOT like the previous case, maybe they can be
merges? Having the feature helper I suggested will reduce that a lot,
but it still seems like most of it is the same except for the shift.
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
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