xfs: remove support for disabling quota accounting on a mounted file system

Disabling quota accounting is hairy, racy code with all kinds of pitfalls.
And it has a very strange mind set, as quota accounting (unlike
enforcement) really is a propery of the on-disk format.  There is no good
use case for supporting this.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

Author: Christoph Hellwig

fs/xfs/libxfs/xfs_trans_resv.c

@@ -798,29 +798,6 @@ xfs_calc_qm_dqalloc_reservation(
 			XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1);
 }
 
-/*
- * Turning off quotas.
- *    the quota off logitems: sizeof(struct xfs_qoff_logitem) * 2
- *    the superblock for the quota flags: sector size
- */
-STATIC uint
-xfs_calc_qm_quotaoff_reservation(
-	struct xfs_mount	*mp)
-{
-	return sizeof(struct xfs_qoff_logitem) * 2 +
-		xfs_calc_buf_res(1, mp->m_sb.sb_sectsize);
-}
-
-/*
- * End of turning off quotas.
- *    the quota off logitems: sizeof(struct xfs_qoff_logitem) * 2
- */
-STATIC uint
-xfs_calc_qm_quotaoff_end_reservation(void)
-{
-	return sizeof(struct xfs_qoff_logitem) * 2;
-}
-
 /*
  * Syncing the incore super block changes to disk.
  *     the super block to reflect the changes: sector size
@@ -923,13 +900,6 @@ xfs_trans_resv_calc(
 	resp->tr_qm_setqlim.tr_logres = xfs_calc_qm_setqlim_reservation();
 	resp->tr_qm_setqlim.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 
-	resp->tr_qm_quotaoff.tr_logres = xfs_calc_qm_quotaoff_reservation(mp);
-	resp->tr_qm_quotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT;
-
-	resp->tr_qm_equotaoff.tr_logres =
-		xfs_calc_qm_quotaoff_end_reservation();
-	resp->tr_qm_equotaoff.tr_logcount = XFS_DEFAULT_LOG_COUNT;
-
 	resp->tr_sb.tr_logres = xfs_calc_sb_reservation(mp);
 	resp->tr_sb.tr_logcount = XFS_DEFAULT_LOG_COUNT;
 

fs/xfs/libxfs/xfs_trans_resv.h

@@ -46,8 +46,6 @@ struct xfs_trans_resv {
 	struct xfs_trans_res	tr_growrtfree;	/* grow realtime freeing */
 	struct xfs_trans_res	tr_qm_setqlim;	/* adjust quota limits */
 	struct xfs_trans_res	tr_qm_dqalloc;	/* allocate quota on disk */
-	struct xfs_trans_res	tr_qm_quotaoff;	/* turn quota off */
-	struct xfs_trans_res	tr_qm_equotaoff;/* end of turn quota off */
 	struct xfs_trans_res	tr_sb;		/* modify superblock */
 	struct xfs_trans_res	tr_fsyncts;	/* update timestamps on fsync */
 };

fs/xfs/xfs_dquot_item.c

@@ -218,137 +218,3 @@ xfs_qm_dquot_logitem_init(
 					&xfs_dquot_item_ops);
 	lp->qli_dquot = dqp;
 }
-
-/*------------------  QUOTAOFF LOG ITEMS  -------------------*/
-
-static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
-{
-	return container_of(lip, struct xfs_qoff_logitem, qql_item);
-}
-
-
-/*
- * 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.
- */
-STATIC void
-xfs_qm_qoff_logitem_size(
-	struct xfs_log_item	*lip,
-	int			*nvecs,
-	int			*nbytes)
-{
-	*nvecs += 1;
-	*nbytes += sizeof(struct xfs_qoff_logitem);
-}
-
-STATIC void
-xfs_qm_qoff_logitem_format(
-	struct xfs_log_item	*lip,
-	struct xfs_log_vec	*lv)
-{
-	struct xfs_qoff_logitem	*qflip = QOFF_ITEM(lip);
-	struct xfs_log_iovec	*vecp = NULL;
-	struct xfs_qoff_logformat *qlf;
-
-	qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF);
-	qlf->qf_type = XFS_LI_QUOTAOFF;
-	qlf->qf_size = 1;
-	qlf->qf_flags = qflip->qql_flags;
-	xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem));
-}
-
-/*
- * There isn't much you can do to push a quotaoff item.  It is simply
- * stuck waiting for the log to be flushed to disk.
- */
-STATIC uint
-xfs_qm_qoff_logitem_push(
-	struct xfs_log_item	*lip,
-	struct list_head	*buffer_list)
-{
-	return XFS_ITEM_LOCKED;
-}
-
-STATIC xfs_lsn_t
-xfs_qm_qoffend_logitem_committed(
-	struct xfs_log_item	*lip,
-	xfs_lsn_t		lsn)
-{
-	struct xfs_qoff_logitem	*qfe = QOFF_ITEM(lip);
-	struct xfs_qoff_logitem	*qfs = qfe->qql_start_lip;
-
-	xfs_qm_qoff_logitem_relse(qfs);
-
-	kmem_free(lip->li_lv_shadow);
-	kmem_free(qfe);
-	return (xfs_lsn_t)-1;
-}
-
-STATIC void
-xfs_qm_qoff_logitem_release(
-	struct xfs_log_item	*lip)
-{
-	struct xfs_qoff_logitem	*qoff = QOFF_ITEM(lip);
-
-	if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) {
-		if (qoff->qql_start_lip)
-			xfs_qm_qoff_logitem_relse(qoff->qql_start_lip);
-		xfs_qm_qoff_logitem_relse(qoff);
-	}
-}
-
-static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
-	.iop_size	= xfs_qm_qoff_logitem_size,
-	.iop_format	= xfs_qm_qoff_logitem_format,
-	.iop_committed	= xfs_qm_qoffend_logitem_committed,
-	.iop_push	= xfs_qm_qoff_logitem_push,
-	.iop_release	= xfs_qm_qoff_logitem_release,
-};
-
-static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
-	.iop_size	= xfs_qm_qoff_logitem_size,
-	.iop_format	= xfs_qm_qoff_logitem_format,
-	.iop_push	= xfs_qm_qoff_logitem_push,
-	.iop_release	= xfs_qm_qoff_logitem_release,
-};
-
-/*
- * Delete the quotaoff intent from the AIL and free it. On success,
- * this should only be called for the start item. It can be used for
- * either on shutdown or abort.
- */
-void
-xfs_qm_qoff_logitem_relse(
-	struct xfs_qoff_logitem	*qoff)
-{
-	struct xfs_log_item	*lip = &qoff->qql_item;
-
-	ASSERT(test_bit(XFS_LI_IN_AIL, &lip->li_flags) ||
-	       test_bit(XFS_LI_ABORTED, &lip->li_flags) ||
-	       XFS_FORCED_SHUTDOWN(lip->li_mountp));
-	xfs_trans_ail_delete(lip, 0);
-	kmem_free(lip->li_lv_shadow);
-	kmem_free(qoff);
-}
-
-/*
- * Allocate and initialize an quotaoff item of the correct quota type(s).
- */
-struct xfs_qoff_logitem *
-xfs_qm_qoff_logitem_init(
-	struct xfs_mount	*mp,
-	struct xfs_qoff_logitem	*start,
-	uint			flags)
-{
-	struct xfs_qoff_logitem	*qf;
-
-	qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), 0);
-
-	xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
-			&xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
-	qf->qql_item.li_mountp = mp;
-	qf->qql_start_lip = start;
-	qf->qql_flags = flags;
-	return qf;
-}

fs/xfs/xfs_dquot_item.h

@@ -9,30 +9,13 @@
 struct xfs_dquot;
 struct xfs_trans;
 struct xfs_mount;
-struct xfs_qoff_logitem;
 
 struct xfs_dq_logitem {
 	struct xfs_log_item	qli_item;	/* common portion */
 	struct xfs_dquot	*qli_dquot;	/* dquot ptr */
 	xfs_lsn_t		qli_flush_lsn;	/* lsn at last flush */
 };
 
-struct xfs_qoff_logitem {
-	struct xfs_log_item	qql_item;	/* common portion */
-	struct xfs_qoff_logitem *qql_start_lip;	/* qoff-start logitem, if any */
-	unsigned int		qql_flags;
-};
-
-
 void xfs_qm_dquot_logitem_init(struct xfs_dquot *dqp);
-struct xfs_qoff_logitem	*xfs_qm_qoff_logitem_init(struct xfs_mount *mp,
-		struct xfs_qoff_logitem *start,
-		uint flags);
-void xfs_qm_qoff_logitem_relse(struct xfs_qoff_logitem *);
-struct xfs_qoff_logitem	*xfs_trans_get_qoff_item(struct xfs_trans *tp,
-		struct xfs_qoff_logitem *startqoff,
-		uint flags);
-void xfs_trans_log_quotaoff_item(struct xfs_trans *tp,
-		struct xfs_qoff_logitem *qlp);
 
 #endif	/* __XFS_DQUOT_ITEM_H__ */

fs/xfs/xfs_qm.c

@@ -185,7 +185,7 @@ xfs_qm_dqpurge(
 /*
  * Purge the dquot cache.
  */
-void
+static void
 xfs_qm_dqpurge_all(
 	struct xfs_mount	*mp,
 	uint			flags)

fs/xfs/xfs_qm.h

@@ -140,9 +140,6 @@ struct xfs_dquot_acct {
 
 extern void		xfs_qm_destroy_quotainfo(struct xfs_mount *);
 
-/* dquot stuff */
-extern void		xfs_qm_dqpurge_all(struct xfs_mount *, uint);
-
 /* quota ops */
 extern int		xfs_qm_scall_trunc_qfiles(struct xfs_mount *, uint);
 extern int		xfs_qm_scall_getquota(struct xfs_mount *mp,