Re: [PATCH v2 007/110] ext4: use PRIino format for i_ino

On Tue, 2026-03-03 at 12:20 +0100, Jan Kara wrote:
> On Mon 02-03-26 15:23:51, Jeff Layton wrote:
> > Convert ext4 i_ino format strings to use the PRIino format
> > macro in preparation for the widening of i_ino via kino_t.
> >=20
> > In trace events, change __field(ino_t, ...) to __field(u64, ...)
> > and update TP_printk format strings to %llu/%llx to match the
> > widened field type.
> >=20
> > Update local variables and function parameters that hold i_ino
> > values from unsigned long to kino_t.
> >=20
> > Signed-off-by: Jeff Layton <[email protected]>
>=20
> Two small comments. Otherwise feel free to add:
>=20
> Reviewed-by: Jan Kara <[email protected]>
>=20
> > diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
> > index 96ab95167bd6e10ba86e61a60cb0be9fbafe157f..43103816b80ef4901858bcd=
789acb0ffb2612317 100644
> > --- a/fs/ext4/migrate.c
> > +++ b/fs/ext4/migrate.c
> > @@ -455,7 +455,7 @@ int ext4_ext_migrate(struct inode *inode)
> >  	 * log, so disable fast commits for this transaction.
> >  	 */
> >  	ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_MIGRATE, handle);
> > -	goal =3D (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) *
> > +	goal =3D (div_u64(inode->i_ino - 1, EXT4_INODES_PER_GROUP(inode->i_sb=
)) *
>=20
> Ext4 doesn't support more than 2^32 inodes (due to on-disk format). Thus
> i_ino is always guaranteed to be a number that fits in 32-bits. Thus I'd
> here just type i_ino to (unsigned int) and be done with it like you've do=
ne
> it at other places.
>=20
> ...
>=20

Thanks. Fixed both places. I ended up casting the above to a u32 since
this patchset has given me a stronger affinity for explicit-width
types.

> > @@ -1823,7 +1823,7 @@ TRACE_EVENT(ext4_journal_start_inode,
> >  	TP_ARGS(inode, blocks, rsv_blocks, revoke_creds, type, IP),
> > =20
> >  	TP_STRUCT__entry(
> > -		__field(	unsigned long,	ino		)
> > +		__field(	u64,		ino		)
> >  		__field(	dev_t,		dev		)
> >  		__field(	unsigned long,	ip		)
> >  		__field(	int,		blocks		)
> > @@ -1843,9 +1843,10 @@ TRACE_EVENT(ext4_journal_start_inode,
> >  	),
> > =20
> >  	TP_printk("dev %d,%d blocks %d, rsv_blocks %d, revoke_creds %d,"
> > -		  " type %d, ino %lu, caller %pS", MAJOR(__entry->dev),
> > +		  " type %d, ino %llu, caller %pS", MAJOR(__entry->dev),
> >  		  MINOR(__entry->dev), __entry->blocks, __entry->rsv_blocks,
> > -		  __entry->revoke_creds, __entry->type, __entry->ino,
> > +		  __entry->revoke_creds, __entry->type,
> > +		  (unsigned long long) __entry->ino,
>=20
> Not point in the type cast?
>=20
> 								Honza

--=20
Jeff Layton <[email protected]>