Commit 410b11a6 authored Feb 07, 2014 by Brian Foster Committed by Dave Chinner Feb 07, 2014

xfs: use tr_qm_dqalloc log reservation for dquot alloc



The dquot allocation path in xfs_qm_dqread() currently uses the
attribute set log reservation, which appears to be incorrect. We
have reports of transaction reservation overruns with the current
code. E.g., a repeated run of xfstests test generic/270 on a 512b
block size fs occassionally produces the following in dmesg:

	XFS (sdN): xlog_write: reservation summary:
	  trans type  = QM_DQALLOC (30)
	  unit res    = 7080 bytes
	  current res = -632 bytes
	  total reg   = 0 bytes (o/flow = 0 bytes)
	  ophdrs      = 0 (ophdr space = 0 bytes)
	  ophdr + reg = 0 bytes
	  num regions = 0

	XFS (sdN): xlog_write: reservation ran out. Need to up reservation

The dquot allocation case should consist of a write reservation
(i.e., we are allocating a range of the internal quota file) plus
the size of the actual dquots. We already have a log reservation
definition for this operation (tr_qm_dqalloc). Use it in
xfs_qm_dqread() and update the log reservation calculation function
to use the write res. calculation function rather than reading the
assumed to be pre-calculated value directly.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Jie Liu <jeff.liu@oracle.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

parent c19ec235

fs/xfs/xfs_dquot.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -615,7 +615,7 @@ xfs_qm_dqread(

		if (flags & XFS_QMOPT_DQALLOC) {
		tp = xfs_trans_alloc(mp, XFS_TRANS_QM_DQALLOC);
		error = xfs_trans_reserve(tp, &M_RES(mp)->tr_attrsetm,
		error = xfs_trans_reserve(tp, &M_RES(mp)->tr_qm_dqalloc,
		XFS_QM_DQALLOC_SPACE_RES(mp), 0);
		if (error)
		goto error1;

fs/xfs/xfs_trans_resv.c

+2 −3

Original line number	Diff line number	Diff line
		@@ -644,15 +644,14 @@ xfs_calc_qm_setqlim_reservation(

		/*
		* Allocating quota on disk if needed.
		* the write transaction log space: M_RES(mp)->tr_write.tr_logres
		* the write transaction log space for quota file extent allocation
		* the unit of quota allocation: one system block size
		*/
		STATIC uint
		xfs_calc_qm_dqalloc_reservation(
		struct xfs_mount *mp)
		{
		ASSERT(M_RES(mp)->tr_write.tr_logres);
		return M_RES(mp)->tr_write.tr_logres +
		return xfs_calc_write_reservation(mp) +
		xfs_calc_buf_res(1,
		XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) - 1);
		}

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