On Fri 01-08-14 23:48:31, Li Xi wrote:
> 2014-08-01 23:28 GMT+08:00 Li Xi <pkuelelixi@xxxxxxxxx>:
> > 2014-08-01 20:40 GMT+08:00 Jan Kara <jack@xxxxxxx>:
> >>
> >> 1) It should have been also posted to linux-fsdevel@xxxxxxxxxxxxxxx, Al Viro
> >> <viro@xxxxxxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx> because
> >> you are changing core VFS inode and infrastructure as well. For quota
> >> changes you should have also CCed me as a quota maintainer.
> > Sure. Thanks for reminding me. I will add these addresses next time.
> >>
> >> 2) I'm not convinced we actually want project ID in the core inode - so far
> >> only XFS has this. For everyone else it's just extra bloat so we could just
> >> put it in ext4_inode_info. Granted we'd need to somewhat change quota
> >> interface so that it sees all the ids (uid, gid, projid) but they are
> >> really needed in two places - dquot_initalize() and dquot_transfer() and
> >> creating variants of these functions that just take an array of ids and use
> >> them in ext4 is simple enough.
> > OK, agreed.
> After searching dquot_initalize() and dquot_transfer(), I found changing these
> two functions envolves too many file systems. Is there any good reason not to
> add kprojid_t field in inode structure?
Yes. It grows struct inode which is used by *all* filesystems and only
ext4 (and possibly xfs) would use it. That's why I suggested you create
something like:
struct inode_ids {
kuid_t uid;
kgid_t gid;
kprojid_t projid;
};
void dquot_initialize_ids(struct inode *inode, struct inode_ids *ids)
{
...
}
and
static inline void dquot_initialize(struct inode *inode)
{
struct inode_ids ids = {
.uid = inode->i_uid,
.gid = inode->i_gid,
.projid = INVALID_PROJID,
};
dquot_initialize_ids(inode, &ids);
}
Then filesystems not using project ids remain untouched and filesystems
with project ids (i.e. ext4) can use dquot_initialize_ids() - probably you
should create something like:
static inline void ext4_dquot_initialize(struct inode *inode)
{
struct inode_ids ids = {
.uid = inode->i_uid,
.gid = inode->i_gid,
.projid = EXT4_I(inode)->i_projid,
};
dquot_initialize_ids(inode, &ids);
}
and use ext4_dquot_initialize() throughout ext4.
Honza
--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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