xfs_dquot_item.c

linux-2.4.29操作系统的源码

		} else {
			retval = XFS_ITEM_FLUSHING;
			xfs_dqunlock_nonotify(dqp);
		}
	}

	ASSERT(qip->qli_item.li_flags & XFS_LI_IN_AIL);
	return (retval);
}


/*
 * Unlock the dquot associated with the log item.
 * Clear the fields of the dquot and dquot log item that
 * are specific to the current transaction.  If the
 * hold flags is set, do not unlock the dquot.
 */
STATIC void
xfs_qm_dquot_logitem_unlock(
	xfs_dq_logitem_t    *ql)
{
	xfs_dquot_t	*dqp;

	ASSERT(ql != NULL);
	dqp = ql->qli_dquot;
	ASSERT(XFS_DQ_IS_LOCKED(dqp));

	/*
	 * Clear the transaction pointer in the dquot
	 */
	dqp->q_transp = NULL;

	/*
	 * dquots are never 'held' from getting unlocked at the end of
	 * a transaction.  Their locking and unlocking is hidden inside the
	 * transaction layer, within trans_commit. Hence, no LI_HOLD flag
	 * for the logitem.
	 */
	xfs_dqunlock(dqp);
}


/*
 * The transaction with the dquot locked has aborted.  The dquot
 * must not be dirty within the transaction.  We simply unlock just
 * as if the transaction had been cancelled.
 */
STATIC void
xfs_qm_dquot_logitem_abort(
	xfs_dq_logitem_t    *ql)
{
	xfs_qm_dquot_logitem_unlock(ql);
}

/*
 * this needs to stamp an lsn into the dquot, I think.
 * rpc's that look at user dquot's would then have to
 * push on the dependency recorded in the dquot
 */
/* ARGSUSED */
STATIC void
xfs_qm_dquot_logitem_committing(
	xfs_dq_logitem_t	*l,
	xfs_lsn_t		lsn)
{
	return;
}


/*
 * This is the ops vector for dquots
 */
struct xfs_item_ops xfs_dquot_item_ops = {
	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_size,
	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
					xfs_qm_dquot_logitem_format,
	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_pin,
	.iop_unpin	= (void(*)(xfs_log_item_t*, int))
					xfs_qm_dquot_logitem_unpin,
	.iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
					xfs_qm_dquot_logitem_unpin_remove,
	.iop_trylock	= (uint(*)(xfs_log_item_t*))
					xfs_qm_dquot_logitem_trylock,
	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_unlock,
	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_dquot_logitem_committed,
	.iop_push	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_push,
	.iop_abort	= (void(*)(xfs_log_item_t*))xfs_qm_dquot_logitem_abort,
	.iop_pushbuf	= (void(*)(xfs_log_item_t*))
					xfs_qm_dquot_logitem_pushbuf,
	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_dquot_logitem_committing
};

/*
 * Initialize the dquot log item for a newly allocated dquot.
 * The dquot isn't locked at this point, but it isn't on any of the lists
 * either, so we don't care.
 */
void
xfs_qm_dquot_logitem_init(
	struct xfs_dquot *dqp)
{
	xfs_dq_logitem_t  *lp;
	lp = &dqp->q_logitem;

	lp->qli_item.li_type = XFS_LI_DQUOT;
	lp->qli_item.li_ops = &xfs_dquot_item_ops;
	lp->qli_item.li_mountp = dqp->q_mount;
	lp->qli_dquot = dqp;
	lp->qli_format.qlf_type = XFS_LI_DQUOT;
	lp->qli_format.qlf_id = INT_GET(dqp->q_core.d_id, ARCH_CONVERT);
	lp->qli_format.qlf_blkno = dqp->q_blkno;
	lp->qli_format.qlf_len = 1;
	/*
	 * This is just the offset of this dquot within its buffer
	 * (which is currently 1 FSB and probably won't change).
	 * Hence 32 bits for this offset should be just fine.
	 * Alternatively, we can store (bufoffset / sizeof(xfs_dqblk_t))
	 * here, and recompute it at recovery time.
	 */
	lp->qli_format.qlf_boffset = (__uint32_t)dqp->q_bufoffset;
}

/*------------------  QUOTAOFF LOG ITEMS  -------------------*/

/*
 * This returns the number of iovecs needed to log the given quotaoff item.
 * We only need 1 iovec for an quotaoff item.  It just logs the
 * quotaoff_log_format structure.
 */
/*ARGSUSED*/
STATIC uint
xfs_qm_qoff_logitem_size(xfs_qoff_logitem_t *qf)
{
	return (1);
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given quotaoff log item. We use only 1 iovec, and we point that
 * at the quotaoff_log_format structure embedded in the quotaoff item.
 * It is at this point that we assert that all of the extent
 * slots in the quotaoff item have been filled.
 */
STATIC void
xfs_qm_qoff_logitem_format(xfs_qoff_logitem_t	*qf,
			   xfs_log_iovec_t	*log_vector)
{
	ASSERT(qf->qql_format.qf_type == XFS_LI_QUOTAOFF);

	log_vector->i_addr = (xfs_caddr_t)&(qf->qql_format);
	log_vector->i_len = sizeof(xfs_qoff_logitem_t);
	qf->qql_format.qf_size = 1;
}


/*
 * Pinning has no meaning for an quotaoff item, so just return.
 */
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_pin(xfs_qoff_logitem_t *qf)
{
	return;
}


/*
 * Since pinning has no meaning for an quotaoff item, unpinning does
 * not either.
 */
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_unpin(xfs_qoff_logitem_t *qf, int stale)
{
	return;
}

/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_unpin_remove(xfs_qoff_logitem_t *qf, xfs_trans_t *tp)
{
	return;
}

/*
 * Quotaoff items have no locking, so just return success.
 */
/*ARGSUSED*/
STATIC uint
xfs_qm_qoff_logitem_trylock(xfs_qoff_logitem_t *qf)
{
	return XFS_ITEM_LOCKED;
}

/*
 * Quotaoff items have no locking or pushing, so return failure
 * so that the caller doesn't bother with us.
 */
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_unlock(xfs_qoff_logitem_t *qf)
{
	return;
}

/*
 * The quotaoff-start-item is logged only once and cannot be moved in the log,
 * so simply return the lsn at which it's been logged.
 */
/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_qm_qoff_logitem_committed(xfs_qoff_logitem_t *qf, xfs_lsn_t lsn)
{
	return (lsn);
}

/*
 * The transaction of which this QUOTAOFF is a part has been aborted.
 * Just clean up after ourselves.
 * Shouldn't this never happen in the case of qoffend logitems? XXX
 */
STATIC void
xfs_qm_qoff_logitem_abort(xfs_qoff_logitem_t *qf)
{
	kmem_free(qf, sizeof(xfs_qoff_logitem_t));
}

/*
 * There isn't much you can do to push on an quotaoff item.  It is simply
 * stuck waiting for the log to be flushed to disk.
 */
/*ARGSUSED*/
STATIC void
xfs_qm_qoff_logitem_push(xfs_qoff_logitem_t *qf)
{
	return;
}


/*ARGSUSED*/
STATIC xfs_lsn_t
xfs_qm_qoffend_logitem_committed(
	xfs_qoff_logitem_t *qfe,
	xfs_lsn_t lsn)
{
	xfs_qoff_logitem_t	*qfs;
	SPLDECL(s);

	qfs = qfe->qql_start_lip;
	AIL_LOCK(qfs->qql_item.li_mountp,s);
	/*
	 * Delete the qoff-start logitem from the AIL.
	 * xfs_trans_delete_ail() drops the AIL lock.
	 */
	xfs_trans_delete_ail(qfs->qql_item.li_mountp, (xfs_log_item_t *)qfs, s);
	kmem_free(qfs, sizeof(xfs_qoff_logitem_t));
	kmem_free(qfe, sizeof(xfs_qoff_logitem_t));
	return (xfs_lsn_t)-1;
}

/*
 * XXX rcc - don't know quite what to do with this.  I think we can
 * just ignore it.  The only time that isn't the case is if we allow
 * the client to somehow see that quotas have been turned off in which
 * we can't allow that to get back until the quotaoff hits the disk.
 * So how would that happen?  Also, do we need different routines for
 * quotaoff start and quotaoff end?  I suspect the answer is yes but
 * to be sure, I need to look at the recovery code and see how quota off
 * recovery is handled (do we roll forward or back or do something else).
 * If we roll forwards or backwards, then we need two separate routines,
 * one that does nothing and one that stamps in the lsn that matters
 * (truly makes the quotaoff irrevocable).  If we do something else,
 * then maybe we don't need two.
 */
/* ARGSUSED */
STATIC void
xfs_qm_qoff_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
{
	return;
}

/* ARGSUSED */
STATIC void
xfs_qm_qoffend_logitem_committing(xfs_qoff_logitem_t *qip, xfs_lsn_t commit_lsn)
{
	return;
}

struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
					xfs_qm_qoff_logitem_format,
	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
	.iop_unpin	= (void(*)(xfs_log_item_t* ,int))
					xfs_qm_qoff_logitem_unpin,
	.iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
					xfs_qm_qoff_logitem_unpin_remove,
	.iop_trylock	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_qoffend_logitem_committed,
	.iop_push	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
	.iop_abort	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
	.iop_pushbuf	= NULL,
	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_qoffend_logitem_committing
};

/*
 * This is the ops vector shared by all quotaoff-start log items.
 */
struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
	.iop_size	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_size,
	.iop_format	= (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
					xfs_qm_qoff_logitem_format,
	.iop_pin	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_pin,
	.iop_unpin	= (void(*)(xfs_log_item_t*, int))
					xfs_qm_qoff_logitem_unpin,
	.iop_unpin_remove = (void(*)(xfs_log_item_t*,xfs_trans_t*))
					xfs_qm_qoff_logitem_unpin_remove,
	.iop_trylock	= (uint(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_trylock,
	.iop_unlock	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_unlock,
	.iop_committed	= (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_qoff_logitem_committed,
	.iop_push	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_push,
	.iop_abort	= (void(*)(xfs_log_item_t*))xfs_qm_qoff_logitem_abort,
	.iop_pushbuf	= NULL,
	.iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
					xfs_qm_qoff_logitem_committing
};

/*
 * Allocate and initialize an quotaoff item of the correct quota type(s).
 */
xfs_qoff_logitem_t *
xfs_qm_qoff_logitem_init(
	struct xfs_mount *mp,
	xfs_qoff_logitem_t *start,
	uint flags)
{
	xfs_qoff_logitem_t	*qf;

	qf = (xfs_qoff_logitem_t*) kmem_zalloc(sizeof(xfs_qoff_logitem_t), KM_SLEEP);

	qf->qql_item.li_type = XFS_LI_QUOTAOFF;
	if (start)
		qf->qql_item.li_ops = &xfs_qm_qoffend_logitem_ops;
	else
		qf->qql_item.li_ops = &xfs_qm_qoff_logitem_ops;
	qf->qql_item.li_mountp = mp;
	qf->qql_format.qf_type = XFS_LI_QUOTAOFF;
	qf->qql_format.qf_flags = flags;
	qf->qql_start_lip = start;
	return (qf);
}