On Mon, Dec 19, 2011 at 05:54:23AM +0100, Andreas Dilger wrote:
> On 2011-12-14, at 2:13 AM, Darrick J. Wong wrote:
> > Define flags and extend ext4 structure definitions to support metadata
> > checksumming. Ted T'so covered many of these fields in an earlier patch, but
> > there are more required changes to the disk layout.
> >
> > diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> > index 0f8cde8..ce2fd66 100644
> > --- a/lib/ext2fs/ext2_fs.h
> > +++ b/lib/ext2fs/ext2_fs.h
> > @@ -234,6 +234,13 @@ struct ext2_dx_countlimit {
> > +/*
> > + * This goes at the end of each htree block.
> > + */
> > +struct ext2_dx_tail {
> > + __u32 reserved;
> > + __u32 checksum; /* crc32c(uuid+inum+dxblock) */
> > +};
>
> These should have a structure prefix, like "dxt_reserved" and "dxt_checksum"
> to make them easier to find with tags.
>
> > /*
> > + * This is a bogus directory entry at the end of each leaf block that
> > + * records checksums.
> > + */
> > +struct ext2_dir_entry_tail {
> > + __u32 reserved_zero1; /* Pretend to be unused */
> > + __u16 rec_len; /* 12 */
> > + __u16 reserved_name_len; /* 0xDE00, fake namelen/filetype */
> > + __u32 checksum; /* crc32c(uuid+inode+dirent) */
> > +};
>
> Similarly, this should get a structure prefix for all of the fields, like
> "det_checksum" or similar.
Ok.
--D
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