On Fri 22-01-16 12:25:29, Eric Sandeen wrote: > This adds a new quotactl, Q_GETNEXTQUOTA. > > Q_GETNEXTQUOTA is exactly like Q_GETQUOTA, except that it will > return quota information for the id equal to or greater than > the id requested. In other words, if the specified id has > no quota, the command will return quota information for the > next higher id which does have a quota set. If no higher id > has an active quota, -ESRCH is returned. > > So if you ask for id X, you can get back quota for id X, > id X+N, or -ESRCH if no higher id has a quota. > > This allows filesystems to do efficient iteration in kernelspace, > much like extN filesystems do in userspace when asked to report > all active quotas. > > Today, filesystems such as XFS require getpwent()-style iterations, > and for systems which have i.e. LDAP backends, this can be very > slow, or even impossible if iteration is not allowed in the > configuration. > > Patches 1 and 4 are just small fixups that turned up along the way; > 2 and 3 add the actual quota plumbing, and the rest are xfs-specific > to allow xfs to support this new interface. > > For non-xfs quota, this does require a new structure which is > able to pass back the discovered ID along with the quota info. > For xfs-quota, the id is already present in the structure. > > V3: > * Remove 32-bit compat stuff (i686/x86_64 at least works w/o it...) > * Require CAP_SYS_ADMIN for these calls > * Pass back found ID in &qid passed to ->get_nextdqblk, rather > than modifying struct qc_dqblk > * Munge that found ID back through user-namespace conversions > before returning it in the user structure. So I've taken patch 1/7 into my tree since that is completely independent. Patches 2/7 and 3/7 look mostly good to me (except for that small omission in 3/7) so I can take them to my tree as well. Once I'll finish testing some UDF changes I have pending I'll push the tree to: git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs.git for_next and Dave can pull from there to have a basis for XFS patches. I want to implement Q_GETNEXTQUOTA for VFS quota formats as well and those will go through my tree so that's why I want the interface changes go via my tree. Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
