Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 220 insertions, 0 deletions

diff --git a/fs/xfs/xfs_dquot_item.c b/fs/xfs/xfs_dquot_item.c
new file mode 100644
index 000000000..6a1aae799
--- /dev/null
+++ b/fs/xfs/xfs_dquot_item.c
@@ -0,0 +1,220 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_inode.h"
+#include "xfs_quota.h"
+#include "xfs_trans.h"
+#include "xfs_buf_item.h"
+#include "xfs_trans_priv.h"
+#include "xfs_qm.h"
+#include "xfs_log.h"
+
+static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
+{
+	return container_of(lip, struct xfs_dq_logitem, qli_item);
+}
+
+/*
+ * returns the number of iovecs needed to log the given dquot item.
+ */
+STATIC void
+xfs_qm_dquot_logitem_size(
+	struct xfs_log_item	*lip,
+	int			*nvecs,
+	int			*nbytes)
+{
+	*nvecs += 2;
+	*nbytes += sizeof(struct xfs_dq_logformat) +
+		   sizeof(struct xfs_disk_dquot);
+}
+
+/*
+ * fills in the vector of log iovecs for the given dquot log item.
+ */
+STATIC void
+xfs_qm_dquot_logitem_format(
+	struct xfs_log_item	*lip,
+	struct xfs_log_vec	*lv)
+{
+	struct xfs_disk_dquot	ddq;
+	struct xfs_dq_logitem	*qlip = DQUOT_ITEM(lip);
+	struct xfs_log_iovec	*vecp = NULL;
+	struct xfs_dq_logformat	*qlf;
+
+	qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
+	qlf->qlf_type = XFS_LI_DQUOT;
+	qlf->qlf_size = 2;
+	qlf->qlf_id = qlip->qli_dquot->q_id;
+	qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
+	qlf->qlf_len = 1;
+	qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
+	xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
+
+	xfs_dquot_to_disk(&ddq, qlip->qli_dquot);
+
+	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT, &ddq,
+			sizeof(struct xfs_disk_dquot));
+}
+
+/*
+ * Increment the pin count of the given dquot.
+ */
+STATIC void
+xfs_qm_dquot_logitem_pin(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
+
+	ASSERT(XFS_DQ_IS_LOCKED(dqp));
+	atomic_inc(&dqp->q_pincount);
+}
+
+/*
+ * Decrement the pin count of the given dquot, and wake up
+ * anyone in xfs_dqwait_unpin() if the count goes to 0.	 The
+ * dquot must have been previously pinned with a call to
+ * xfs_qm_dquot_logitem_pin().
+ */
+STATIC void
+xfs_qm_dquot_logitem_unpin(
+	struct xfs_log_item	*lip,
+	int			remove)
+{
+	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
+
+	ASSERT(atomic_read(&dqp->q_pincount) > 0);
+	if (atomic_dec_and_test(&dqp->q_pincount))
+		wake_up(&dqp->q_pinwait);
+}
+
+/*
+ * This is called to wait for the given dquot to be unpinned.
+ * Most of these pin/unpin routines are plagiarized from inode code.
+ */
+void
+xfs_qm_dqunpin_wait(
+	struct xfs_dquot	*dqp)
+{
+	ASSERT(XFS_DQ_IS_LOCKED(dqp));
+	if (atomic_read(&dqp->q_pincount) == 0)
+		return;
+
+	/*
+	 * Give the log a push so we don't wait here too long.
+	 */
+	xfs_log_force(dqp->q_mount, 0);
+	wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
+}
+
+STATIC uint
+xfs_qm_dquot_logitem_push(
+	struct xfs_log_item	*lip,
+	struct list_head	*buffer_list)
+		__releases(&lip->li_ailp->ail_lock)
+		__acquires(&lip->li_ailp->ail_lock)
+{
+	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
+	struct xfs_buf		*bp = lip->li_buf;
+	uint			rval = XFS_ITEM_SUCCESS;
+	int			error;
+
+	if (atomic_read(&dqp->q_pincount) > 0)
+		return XFS_ITEM_PINNED;
+
+	if (!xfs_dqlock_nowait(dqp))
+		return XFS_ITEM_LOCKED;
+
+	/*
+	 * Re-check the pincount now that we stabilized the value by
+	 * taking the quota lock.
+	 */
+	if (atomic_read(&dqp->q_pincount) > 0) {
+		rval = XFS_ITEM_PINNED;
+		goto out_unlock;
+	}
+
+	/*
+	 * Someone else is already flushing the dquot.  Nothing we can do
+	 * here but wait for the flush to finish and remove the item from
+	 * the AIL.
+	 */
+	if (!xfs_dqflock_nowait(dqp)) {
+		rval = XFS_ITEM_FLUSHING;
+		goto out_unlock;
+	}
+
+	spin_unlock(&lip->li_ailp->ail_lock);
+
+	error = xfs_qm_dqflush(dqp, &bp);
+	if (!error) {
+		if (!xfs_buf_delwri_queue(bp, buffer_list))
+			rval = XFS_ITEM_FLUSHING;
+		xfs_buf_relse(bp);
+	} else if (error == -EAGAIN)
+		rval = XFS_ITEM_LOCKED;
+
+	spin_lock(&lip->li_ailp->ail_lock);
+out_unlock:
+	xfs_dqunlock(dqp);
+	return rval;
+}
+
+STATIC void
+xfs_qm_dquot_logitem_release(
+	struct xfs_log_item	*lip)
+{
+	struct xfs_dquot	*dqp = DQUOT_ITEM(lip)->qli_dquot;
+
+	ASSERT(XFS_DQ_IS_LOCKED(dqp));
+
+	/*
+	 * 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);
+}
+
+STATIC void
+xfs_qm_dquot_logitem_committing(
+	struct xfs_log_item	*lip,
+	xfs_csn_t		seq)
+{
+	return xfs_qm_dquot_logitem_release(lip);
+}
+
+static const struct xfs_item_ops xfs_dquot_item_ops = {
+	.iop_size	= xfs_qm_dquot_logitem_size,
+	.iop_format	= xfs_qm_dquot_logitem_format,
+	.iop_pin	= xfs_qm_dquot_logitem_pin,
+	.iop_unpin	= xfs_qm_dquot_logitem_unpin,
+	.iop_release	= xfs_qm_dquot_logitem_release,
+	.iop_committing	= xfs_qm_dquot_logitem_committing,
+	.iop_push	= xfs_qm_dquot_logitem_push,
+};
+
+/*
+ * 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)
+{
+	struct xfs_dq_logitem	*lp = &dqp->q_logitem;
+
+	xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
+					&xfs_dquot_item_ops);
+	lp->qli_dquot = dqp;
+}