Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 245 insertions, 0 deletions

diff --git a/fs/xfs/xfs_dquot.h b/fs/xfs/xfs_dquot.h
new file mode 100644
index 000000000..80c8f851a
--- /dev/null
+++ b/fs/xfs/xfs_dquot.h
@@ -0,0 +1,245 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#ifndef __XFS_DQUOT_H__
+#define __XFS_DQUOT_H__
+
+/*
+ * Dquots are structures that hold quota information about a user or a group,
+ * much like inodes are for files. In fact, dquots share many characteristics
+ * with inodes. However, dquots can also be a centralized resource, relative
+ * to a collection of inodes. In this respect, dquots share some characteristics
+ * of the superblock.
+ * XFS dquots exploit both those in its algorithms. They make every attempt
+ * to not be a bottleneck when quotas are on and have minimal impact, if any,
+ * when quotas are off.
+ */
+
+struct xfs_mount;
+struct xfs_trans;
+
+enum {
+	XFS_QLOWSP_1_PCNT = 0,
+	XFS_QLOWSP_3_PCNT,
+	XFS_QLOWSP_5_PCNT,
+	XFS_QLOWSP_MAX
+};
+
+struct xfs_dquot_res {
+	/* Total resources allocated and reserved. */
+	xfs_qcnt_t		reserved;
+
+	/* Total resources allocated. */
+	xfs_qcnt_t		count;
+
+	/* Absolute and preferred limits. */
+	xfs_qcnt_t		hardlimit;
+	xfs_qcnt_t		softlimit;
+
+	/*
+	 * For root dquots, this is the default grace period, in seconds.
+	 * Otherwise, this is when the quota grace period expires,
+	 * in seconds since the Unix epoch.
+	 */
+	time64_t		timer;
+};
+
+static inline bool
+xfs_dquot_res_over_limits(
+	const struct xfs_dquot_res	*qres)
+{
+	if ((qres->softlimit && qres->softlimit < qres->reserved) ||
+	    (qres->hardlimit && qres->hardlimit < qres->reserved))
+		return true;
+	return false;
+}
+
+/*
+ * The incore dquot structure
+ */
+struct xfs_dquot {
+	struct list_head	q_lru;
+	struct xfs_mount	*q_mount;
+	xfs_dqtype_t		q_type;
+	uint16_t		q_flags;
+	xfs_dqid_t		q_id;
+	uint			q_nrefs;
+	int			q_bufoffset;
+	xfs_daddr_t		q_blkno;
+	xfs_fileoff_t		q_fileoffset;
+
+	struct xfs_dquot_res	q_blk;	/* regular blocks */
+	struct xfs_dquot_res	q_ino;	/* inodes */
+	struct xfs_dquot_res	q_rtb;	/* realtime blocks */
+
+	struct xfs_dq_logitem	q_logitem;
+
+	xfs_qcnt_t		q_prealloc_lo_wmark;
+	xfs_qcnt_t		q_prealloc_hi_wmark;
+	int64_t			q_low_space[XFS_QLOWSP_MAX];
+	struct mutex		q_qlock;
+	struct completion	q_flush;
+	atomic_t		q_pincount;
+	struct wait_queue_head	q_pinwait;
+};
+
+/*
+ * Lock hierarchy for q_qlock:
+ *	XFS_QLOCK_NORMAL is the implicit default,
+ *	XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
+ */
+enum {
+	XFS_QLOCK_NORMAL = 0,
+	XFS_QLOCK_NESTED,
+};
+
+/*
+ * Manage the q_flush completion queue embedded in the dquot. This completion
+ * queue synchronizes processes attempting to flush the in-core dquot back to
+ * disk.
+ */
+static inline void xfs_dqflock(struct xfs_dquot *dqp)
+{
+	wait_for_completion(&dqp->q_flush);
+}
+
+static inline bool xfs_dqflock_nowait(struct xfs_dquot *dqp)
+{
+	return try_wait_for_completion(&dqp->q_flush);
+}
+
+static inline void xfs_dqfunlock(struct xfs_dquot *dqp)
+{
+	complete(&dqp->q_flush);
+}
+
+static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
+{
+	return mutex_trylock(&dqp->q_qlock);
+}
+
+static inline void xfs_dqlock(struct xfs_dquot *dqp)
+{
+	mutex_lock(&dqp->q_qlock);
+}
+
+static inline void xfs_dqunlock(struct xfs_dquot *dqp)
+{
+	mutex_unlock(&dqp->q_qlock);
+}
+
+static inline int
+xfs_dquot_type(const struct xfs_dquot *dqp)
+{
+	return dqp->q_type & XFS_DQTYPE_REC_MASK;
+}
+
+static inline int xfs_this_quota_on(struct xfs_mount *mp, xfs_dqtype_t type)
+{
+	switch (type) {
+	case XFS_DQTYPE_USER:
+		return XFS_IS_UQUOTA_ON(mp);
+	case XFS_DQTYPE_GROUP:
+		return XFS_IS_GQUOTA_ON(mp);
+	case XFS_DQTYPE_PROJ:
+		return XFS_IS_PQUOTA_ON(mp);
+	default:
+		return 0;
+	}
+}
+
+static inline struct xfs_dquot *xfs_inode_dquot(
+	struct xfs_inode	*ip,
+	xfs_dqtype_t		type)
+{
+	switch (type) {
+	case XFS_DQTYPE_USER:
+		return ip->i_udquot;
+	case XFS_DQTYPE_GROUP:
+		return ip->i_gdquot;
+	case XFS_DQTYPE_PROJ:
+		return ip->i_pdquot;
+	default:
+		return NULL;
+	}
+}
+
+/* Decide if the dquot's limits are actually being enforced. */
+static inline bool
+xfs_dquot_is_enforced(
+	const struct xfs_dquot	*dqp)
+{
+	switch (xfs_dquot_type(dqp)) {
+	case XFS_DQTYPE_USER:
+		return XFS_IS_UQUOTA_ENFORCED(dqp->q_mount);
+	case XFS_DQTYPE_GROUP:
+		return XFS_IS_GQUOTA_ENFORCED(dqp->q_mount);
+	case XFS_DQTYPE_PROJ:
+		return XFS_IS_PQUOTA_ENFORCED(dqp->q_mount);
+	}
+	ASSERT(0);
+	return false;
+}
+
+/*
+ * Check whether a dquot is under low free space conditions. We assume the quota
+ * is enabled and enforced.
+ */
+static inline bool xfs_dquot_lowsp(struct xfs_dquot *dqp)
+{
+	int64_t freesp;
+
+	freesp = dqp->q_blk.hardlimit - dqp->q_blk.reserved;
+	if (freesp < dqp->q_low_space[XFS_QLOWSP_1_PCNT])
+		return true;
+
+	return false;
+}
+
+void xfs_dquot_to_disk(struct xfs_disk_dquot *ddqp, struct xfs_dquot *dqp);
+
+#define XFS_DQ_IS_LOCKED(dqp)	(mutex_is_locked(&((dqp)->q_qlock)))
+#define XFS_DQ_IS_DIRTY(dqp)	((dqp)->q_flags & XFS_DQFLAG_DIRTY)
+
+void		xfs_qm_dqdestroy(struct xfs_dquot *dqp);
+int		xfs_qm_dqflush(struct xfs_dquot *dqp, struct xfs_buf **bpp);
+void		xfs_qm_dqunpin_wait(struct xfs_dquot *dqp);
+void		xfs_qm_adjust_dqtimers(struct xfs_dquot *d);
+void		xfs_qm_adjust_dqlimits(struct xfs_dquot *d);
+xfs_dqid_t	xfs_qm_id_for_quotatype(struct xfs_inode *ip,
+				xfs_dqtype_t type);
+int		xfs_qm_dqget(struct xfs_mount *mp, xfs_dqid_t id,
+				xfs_dqtype_t type, bool can_alloc,
+				struct xfs_dquot **dqpp);
+int		xfs_qm_dqget_inode(struct xfs_inode *ip, xfs_dqtype_t type,
+				bool can_alloc, struct xfs_dquot **dqpp);
+int		xfs_qm_dqget_next(struct xfs_mount *mp, xfs_dqid_t id,
+				xfs_dqtype_t type, struct xfs_dquot **dqpp);
+int		xfs_qm_dqget_uncached(struct xfs_mount *mp,
+				xfs_dqid_t id, xfs_dqtype_t type,
+				struct xfs_dquot **dqpp);
+void		xfs_qm_dqput(struct xfs_dquot *dqp);
+
+void		xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
+
+void		xfs_dquot_set_prealloc_limits(struct xfs_dquot *);
+
+static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
+{
+	xfs_dqlock(dqp);
+	dqp->q_nrefs++;
+	xfs_dqunlock(dqp);
+	return dqp;
+}
+
+typedef int (*xfs_qm_dqiterate_fn)(struct xfs_dquot *dq,
+		xfs_dqtype_t type, void *priv);
+int xfs_qm_dqiterate(struct xfs_mount *mp, xfs_dqtype_t type,
+		xfs_qm_dqiterate_fn iter_fn, void *priv);
+
+time64_t xfs_dquot_set_timeout(struct xfs_mount *mp, time64_t timeout);
+time64_t xfs_dquot_set_grace_period(time64_t grace);
+
+#endif /* __XFS_DQUOT_H__ */