diff --git a/Documentation/admin-guide/xfs.rst b/Documentation/admin-guide/xfs.rst
index 746ea60eed3f..acdd4b65964c 100644
--- a/Documentation/admin-guide/xfs.rst
+++ b/Documentation/admin-guide/xfs.rst
@@ -550,6 +550,10 @@ For zoned file systems, the following attributes are exposed in:
 	is limited by the capabilities of the backing zoned device, file system
 	size and the max_open_zones mount option.
 
+  nr_open_zones			(Min:  0  Default:  Varies  Max:  UINTMAX)
+	This read-only attribute exposes the current number of open zones
+	used by the file system.
+
   zonegc_low_space		(Min:  0  Default:  0  Max:  100)
 	Define a percentage for how much of the unused space that GC should keep
 	available for writing. A high value will reclaim more of the space
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index e4b6886e5c3c..d7b648421a70 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1647,16 +1647,12 @@ iomap_zero_range(struct inode *inode, loff_t pos, loff_t len, bool *did_zero,
 	while ((ret = iomap_iter(&iter, ops)) > 0) {
 		const struct iomap *srcmap = iomap_iter_srcmap(&iter);
 
-		if (WARN_ON_ONCE((iter.iomap.flags & IOMAP_F_FOLIO_BATCH) &&
-				 srcmap->type != IOMAP_UNWRITTEN))
-			return -EIO;
-
 		if (!(iter.iomap.flags & IOMAP_F_FOLIO_BATCH) &&
 		    (srcmap->type == IOMAP_HOLE ||
 		     srcmap->type == IOMAP_UNWRITTEN)) {
 			s64 status;
 
-			if (range_dirty) {
+			if (range_dirty && srcmap->type == IOMAP_UNWRITTEN) {
 				range_dirty = false;
 				status = iomap_zero_iter_flush_and_stale(&iter);
 			} else {
diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
index bd8fbb40b49e..dcd2f93b6a6c 100644
--- a/fs/xfs/libxfs/xfs_ag.c
+++ b/fs/xfs/libxfs/xfs_ag.c
@@ -110,10 +110,7 @@ xfs_perag_uninit(
 	struct xfs_group	*xg)
 {
 #ifdef __KERNEL__
-	struct xfs_perag	*pag = to_perag(xg);
-
-	cancel_delayed_work_sync(&pag->pag_blockgc_work);
-	xfs_buf_cache_destroy(&pag->pag_bcache);
+	cancel_delayed_work_sync(&to_perag(xg)->pag_blockgc_work);
 #endif
 }
 
@@ -235,10 +232,6 @@ xfs_perag_alloc(
 	INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
 #endif /* __KERNEL__ */
 
-	error = xfs_buf_cache_init(&pag->pag_bcache);
-	if (error)
-		goto out_free_perag;
-
 	/*
 	 * Pre-calculated geometry
 	 */
@@ -250,12 +243,10 @@ xfs_perag_alloc(
 
 	error = xfs_group_insert(mp, pag_group(pag), index, XG_TYPE_AG);
 	if (error)
-		goto out_buf_cache_destroy;
+		goto out_free_perag;
 
 	return 0;
 
-out_buf_cache_destroy:
-	xfs_buf_cache_destroy(&pag->pag_bcache);
 out_free_perag:
 	kfree(pag);
 	return error;
diff --git a/fs/xfs/libxfs/xfs_ag.h b/fs/xfs/libxfs/xfs_ag.h
index 3cd4790768ff..16a9b43a3c27 100644
--- a/fs/xfs/libxfs/xfs_ag.h
+++ b/fs/xfs/libxfs/xfs_ag.h
@@ -85,8 +85,6 @@ struct xfs_perag {
 	int		pag_ici_reclaimable;	/* reclaimable inodes */
 	unsigned long	pag_ici_reclaim_cursor;	/* reclaim restart point */
 
-	struct xfs_buf_cache	pag_bcache;
-
 	/* background prealloc block trimming */
 	struct delayed_work	pag_blockgc_work;
 #endif /* __KERNEL__ */
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index d165de607d17..185f09f327c0 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -995,7 +995,8 @@ struct xfs_rtgroup_geometry {
 	__u32 rg_sick;		/* o: sick things in ag */
 	__u32 rg_checked;	/* o: checked metadata in ag */
 	__u32 rg_flags;		/* i/o: flags for this ag */
-	__u32 rg_reserved[27];	/* o: zero */
+	__u32 rg_writepointer;  /* o: write pointer block offset for zoned */
+	__u32 rg_reserved[26];	/* o: zero */
 };
 #define XFS_RTGROUP_GEOM_SICK_SUPER	(1U << 0)  /* superblock */
 #define XFS_RTGROUP_GEOM_SICK_BITMAP	(1U << 1)  /* rtbitmap */
@@ -1003,6 +1004,8 @@ struct xfs_rtgroup_geometry {
 #define XFS_RTGROUP_GEOM_SICK_RMAPBT	(1U << 3)  /* reverse mappings */
 #define XFS_RTGROUP_GEOM_SICK_REFCNTBT	(1U << 4)  /* reference counts */
 
+#define XFS_RTGROUP_GEOM_WRITEPOINTER  (1U << 0)  /* write pointer */
+
 /* Health monitor event domains */
 
 /* affects the whole fs */
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index d2f3c50d80e7..580d40a5ee57 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -31,20 +31,20 @@ struct kmem_cache *xfs_buf_cache;
  *
  * xfs_buf_stale:
  *	b_sema (caller holds)
- *	  b_lock
+ *	  b_lockref.lock
  *	    lru_lock
  *
  * xfs_buf_rele:
- *	b_lock
+ *	b_lockref.lock
  *	  lru_lock
  *
  * xfs_buftarg_drain_rele
  *	lru_lock
- *	  b_lock (trylock due to inversion)
+ *	  b_lockref.lock (trylock due to inversion)
  *
  * xfs_buftarg_isolate
  *	lru_lock
- *	  b_lock (trylock due to inversion)
+ *	  b_lockref.lock (trylock due to inversion)
  */
 
 static void xfs_buf_submit(struct xfs_buf *bp);
@@ -78,14 +78,11 @@ xfs_buf_stale(
 	 */
 	bp->b_flags &= ~_XBF_DELWRI_Q;
 
-	spin_lock(&bp->b_lock);
+	spin_lock(&bp->b_lockref.lock);
 	atomic_set(&bp->b_lru_ref, 0);
-	if (!(bp->b_state & XFS_BSTATE_DISPOSE) &&
-	    (list_lru_del_obj(&bp->b_target->bt_lru, &bp->b_lru)))
-		bp->b_hold--;
-
-	ASSERT(bp->b_hold >= 1);
-	spin_unlock(&bp->b_lock);
+	if (!__lockref_is_dead(&bp->b_lockref))
+		list_lru_del_obj(&bp->b_target->bt_lru, &bp->b_lru);
+	spin_unlock(&bp->b_lockref.lock);
 }
 
 static void
@@ -277,10 +274,8 @@ xfs_buf_alloc(
 	 * inserting into the hash table are safe (and will have to wait for
 	 * the unlock to do anything non-trivial).
 	 */
-	bp->b_hold = 1;
+	lockref_init(&bp->b_lockref);
 	sema_init(&bp->b_sema, 0); /* held, no waiters */
-
-	spin_lock_init(&bp->b_lock);
 	atomic_set(&bp->b_lru_ref, 1);
 	init_completion(&bp->b_iowait);
 	INIT_LIST_HEAD(&bp->b_lru);
@@ -368,20 +363,6 @@ static const struct rhashtable_params xfs_buf_hash_params = {
 	.obj_cmpfn		= _xfs_buf_obj_cmp,
 };
 
-int
-xfs_buf_cache_init(
-	struct xfs_buf_cache	*bch)
-{
-	return rhashtable_init(&bch->bc_hash, &xfs_buf_hash_params);
-}
-
-void
-xfs_buf_cache_destroy(
-	struct xfs_buf_cache	*bch)
-{
-	rhashtable_destroy(&bch->bc_hash);
-}
-
 static int
 xfs_buf_map_verify(
 	struct xfs_buftarg	*btp,
@@ -437,23 +418,9 @@ xfs_buf_find_lock(
 	return 0;
 }
 
-static bool
-xfs_buf_try_hold(
-	struct xfs_buf		*bp)
-{
-	spin_lock(&bp->b_lock);
-	if (bp->b_hold == 0) {
-		spin_unlock(&bp->b_lock);
-		return false;
-	}
-	bp->b_hold++;
-	spin_unlock(&bp->b_lock);
-	return true;
-}
-
 static inline int
 xfs_buf_lookup(
-	struct xfs_buf_cache	*bch,
+	struct xfs_buftarg	*btp,
 	struct xfs_buf_map	*map,
 	xfs_buf_flags_t		flags,
 	struct xfs_buf		**bpp)
@@ -462,8 +429,8 @@ xfs_buf_lookup(
 	int			error;
 
 	rcu_read_lock();
-	bp = rhashtable_lookup(&bch->bc_hash, map, xfs_buf_hash_params);
-	if (!bp || !xfs_buf_try_hold(bp)) {
+	bp = rhashtable_lookup(&btp->bt_hash, map, xfs_buf_hash_params);
+	if (!bp || !lockref_get_not_dead(&bp->b_lockref)) {
 		rcu_read_unlock();
 		return -ENOENT;
 	}
@@ -487,7 +454,6 @@ xfs_buf_lookup(
 static int
 xfs_buf_find_insert(
 	struct xfs_buftarg	*btp,
-	struct xfs_buf_cache	*bch,
 	struct xfs_perag	*pag,
 	struct xfs_buf_map	*cmap,
 	struct xfs_buf_map	*map,
@@ -507,14 +473,14 @@ xfs_buf_find_insert(
 	new_bp->b_pag = pag;
 
 	rcu_read_lock();
-	bp = rhashtable_lookup_get_insert_fast(&bch->bc_hash,
+	bp = rhashtable_lookup_get_insert_fast(&btp->bt_hash,
 			&new_bp->b_rhash_head, xfs_buf_hash_params);
 	if (IS_ERR(bp)) {
 		rcu_read_unlock();
 		error = PTR_ERR(bp);
 		goto out_free_buf;
 	}
-	if (bp && xfs_buf_try_hold(bp)) {
+	if (bp && lockref_get_not_dead(&bp->b_lockref)) {
 		/* found an existing buffer */
 		rcu_read_unlock();
 		error = xfs_buf_find_lock(bp, flags);
@@ -549,16 +515,6 @@ xfs_buftarg_get_pag(
 	return xfs_perag_get(mp, xfs_daddr_to_agno(mp, map->bm_bn));
 }
 
-static inline struct xfs_buf_cache *
-xfs_buftarg_buf_cache(
-	struct xfs_buftarg		*btp,
-	struct xfs_perag		*pag)
-{
-	if (pag)
-		return &pag->pag_bcache;
-	return btp->bt_cache;
-}
-
 /*
  * Assembles a buffer covering the specified range. The code is optimised for
  * cache hits, as metadata intensive workloads will see 3 orders of magnitude
@@ -572,7 +528,6 @@ xfs_buf_get_map(
 	xfs_buf_flags_t		flags,
 	struct xfs_buf		**bpp)
 {
-	struct xfs_buf_cache	*bch;
 	struct xfs_perag	*pag;
 	struct xfs_buf		*bp = NULL;
 	struct xfs_buf_map	cmap = { .bm_bn = map[0].bm_bn };
@@ -589,9 +544,8 @@ xfs_buf_get_map(
 		return error;
 
 	pag = xfs_buftarg_get_pag(btp, &cmap);
-	bch = xfs_buftarg_buf_cache(btp, pag);
 
-	error = xfs_buf_lookup(bch, &cmap, flags, &bp);
+	error = xfs_buf_lookup(btp, &cmap, flags, &bp);
 	if (error && error != -ENOENT)
 		goto out_put_perag;
 
@@ -603,7 +557,7 @@ xfs_buf_get_map(
 			goto out_put_perag;
 
 		/* xfs_buf_find_insert() consumes the perag reference. */
-		error = xfs_buf_find_insert(btp, bch, pag, &cmap, map, nmaps,
+		error = xfs_buf_find_insert(btp, pag, &cmap, map, nmaps,
 				flags, &bp);
 		if (error)
 			return error;
@@ -856,84 +810,27 @@ xfs_buf_hold(
 {
 	trace_xfs_buf_hold(bp, _RET_IP_);
 
-	spin_lock(&bp->b_lock);
-	bp->b_hold++;
-	spin_unlock(&bp->b_lock);
+	lockref_get(&bp->b_lockref);
 }
 
 static void
-xfs_buf_rele_uncached(
+xfs_buf_destroy(
 	struct xfs_buf		*bp)
 {
-	ASSERT(list_empty(&bp->b_lru));
+	ASSERT(__lockref_is_dead(&bp->b_lockref));
+	ASSERT(!(bp->b_flags & _XBF_DELWRI_Q));
 
-	spin_lock(&bp->b_lock);
-	if (--bp->b_hold) {
-		spin_unlock(&bp->b_lock);
-		return;
+	if (!xfs_buf_is_uncached(bp)) {
+		rhashtable_remove_fast(&bp->b_target->bt_hash,
+				&bp->b_rhash_head, xfs_buf_hash_params);
+
+		if (bp->b_pag)
+			xfs_perag_put(bp->b_pag);
 	}
-	spin_unlock(&bp->b_lock);
+
 	xfs_buf_free(bp);
 }
 
-static void
-xfs_buf_rele_cached(
-	struct xfs_buf		*bp)
-{
-	struct xfs_buftarg	*btp = bp->b_target;
-	struct xfs_perag	*pag = bp->b_pag;
-	struct xfs_buf_cache	*bch = xfs_buftarg_buf_cache(btp, pag);
-	bool			freebuf = false;
-
-	trace_xfs_buf_rele(bp, _RET_IP_);
-
-	spin_lock(&bp->b_lock);
-	ASSERT(bp->b_hold >= 1);
-	if (bp->b_hold > 1) {
-		bp->b_hold--;
-		goto out_unlock;
-	}
-
-	/* we are asked to drop the last reference */
-	if (atomic_read(&bp->b_lru_ref)) {
-		/*
-		 * If the buffer is added to the LRU, keep the reference to the
-		 * buffer for the LRU and clear the (now stale) dispose list
-		 * state flag, else drop the reference.
-		 */
-		if (list_lru_add_obj(&btp->bt_lru, &bp->b_lru))
-			bp->b_state &= ~XFS_BSTATE_DISPOSE;
-		else
-			bp->b_hold--;
-	} else {
-		bp->b_hold--;
-		/*
-		 * most of the time buffers will already be removed from the
-		 * LRU, so optimise that case by checking for the
-		 * XFS_BSTATE_DISPOSE flag indicating the last list the buffer
-		 * was on was the disposal list
-		 */
-		if (!(bp->b_state & XFS_BSTATE_DISPOSE)) {
-			list_lru_del_obj(&btp->bt_lru, &bp->b_lru);
-		} else {
-			ASSERT(list_empty(&bp->b_lru));
-		}
-
-		ASSERT(!(bp->b_flags & _XBF_DELWRI_Q));
-		rhashtable_remove_fast(&bch->bc_hash, &bp->b_rhash_head,
-				xfs_buf_hash_params);
-		if (pag)
-			xfs_perag_put(pag);
-		freebuf = true;
-	}
-
-out_unlock:
-	spin_unlock(&bp->b_lock);
-
-	if (freebuf)
-		xfs_buf_free(bp);
-}
-
 /*
  * Release a hold on the specified buffer.
  */
@@ -942,10 +839,23 @@ xfs_buf_rele(
 	struct xfs_buf		*bp)
 {
 	trace_xfs_buf_rele(bp, _RET_IP_);
-	if (xfs_buf_is_uncached(bp))
-		xfs_buf_rele_uncached(bp);
-	else
-		xfs_buf_rele_cached(bp);
+
+	if (lockref_put_or_lock(&bp->b_lockref))
+		return;
+	if (!--bp->b_lockref.count) {
+		if (xfs_buf_is_uncached(bp) || !atomic_read(&bp->b_lru_ref))
+			goto kill;
+		list_lru_add_obj(&bp->b_target->bt_lru, &bp->b_lru);
+	}
+	spin_unlock(&bp->b_lockref.lock);
+	return;
+
+kill:
+	lockref_mark_dead(&bp->b_lockref);
+	list_lru_del_obj(&bp->b_target->bt_lru, &bp->b_lru);
+	spin_unlock(&bp->b_lockref.lock);
+
+	xfs_buf_destroy(bp);
 }
 
 /*
@@ -1254,9 +1164,11 @@ xfs_buf_ioerror_alert(
 
 /*
  * To simulate an I/O failure, the buffer must be locked and held with at least
- * three references. The LRU reference is dropped by the stale call. The buf
- * item reference is dropped via ioend processing. The third reference is owned
- * by the caller and is dropped on I/O completion if the buffer is XBF_ASYNC.
+ * two references.
+ *
+ * The buf item reference is dropped via ioend processing. The second reference
+ * is owned by the caller and is dropped on I/O completion if the buffer is
+ * XBF_ASYNC.
  */
 void
 xfs_buf_ioend_fail(
@@ -1512,23 +1424,18 @@ xfs_buftarg_drain_rele(
 	struct xfs_buf		*bp = container_of(item, struct xfs_buf, b_lru);
 	struct list_head	*dispose = arg;
 
-	if (!spin_trylock(&bp->b_lock))
+	if (!spin_trylock(&bp->b_lockref.lock))
 		return LRU_SKIP;
-	if (bp->b_hold > 1) {
+	if (bp->b_lockref.count > 0) {
 		/* need to wait, so skip it this pass */
-		spin_unlock(&bp->b_lock);
+		spin_unlock(&bp->b_lockref.lock);
 		trace_xfs_buf_drain_buftarg(bp, _RET_IP_);
 		return LRU_SKIP;
 	}
 
-	/*
-	 * clear the LRU reference count so the buffer doesn't get
-	 * ignored in xfs_buf_rele().
-	 */
-	atomic_set(&bp->b_lru_ref, 0);
-	bp->b_state |= XFS_BSTATE_DISPOSE;
+	lockref_mark_dead(&bp->b_lockref);
 	list_lru_isolate_move(lru, item, dispose);
-	spin_unlock(&bp->b_lock);
+	spin_unlock(&bp->b_lockref.lock);
 	return LRU_REMOVED;
 }
 
@@ -1581,7 +1488,7 @@ xfs_buftarg_drain(
 "Corruption Alert: Buffer at daddr 0x%llx had permanent write failures!",
 					(long long)xfs_buf_daddr(bp));
 			}
-			xfs_buf_rele(bp);
+			xfs_buf_destroy(bp);
 		}
 		if (loop++ != 0)
 			delay(100);
@@ -1610,24 +1517,37 @@ xfs_buftarg_isolate(
 	struct list_head	*dispose = arg;
 
 	/*
-	 * we are inverting the lru lock/bp->b_lock here, so use a trylock.
-	 * If we fail to get the lock, just skip it.
+	 * We are inverting the lru lock vs bp->b_lockref.lock order here, so
+	 * use a trylock.  If we fail to get the lock, just skip the buffer.
 	 */
-	if (!spin_trylock(&bp->b_lock))
+	if (!spin_trylock(&bp->b_lockref.lock))
 		return LRU_SKIP;
+
+	/*
+	 * If the buffer is in use, remove it from the LRU for now.  We can't
+	 * free it while someone is using it, and we should also not count
+	 * eviction passed for it, just as if it hadn't been added to the LRU
+	 * yet.
+	 */
+	if (bp->b_lockref.count > 0) {
+		list_lru_isolate(lru, &bp->b_lru);
+		spin_unlock(&bp->b_lockref.lock);
+		return LRU_REMOVED;
+	}
+
 	/*
 	 * Decrement the b_lru_ref count unless the value is already
 	 * zero. If the value is already zero, we need to reclaim the
 	 * buffer, otherwise it gets another trip through the LRU.
 	 */
 	if (atomic_add_unless(&bp->b_lru_ref, -1, 0)) {
-		spin_unlock(&bp->b_lock);
+		spin_unlock(&bp->b_lockref.lock);
 		return LRU_ROTATE;
 	}
 
-	bp->b_state |= XFS_BSTATE_DISPOSE;
+	lockref_mark_dead(&bp->b_lockref);
 	list_lru_isolate_move(lru, item, dispose);
-	spin_unlock(&bp->b_lock);
+	spin_unlock(&bp->b_lockref.lock);
 	return LRU_REMOVED;
 }
 
@@ -1647,7 +1567,7 @@ xfs_buftarg_shrink_scan(
 		struct xfs_buf *bp;
 		bp = list_first_entry(&dispose, struct xfs_buf, b_lru);
 		list_del_init(&bp->b_lru);
-		xfs_buf_rele(bp);
+		xfs_buf_destroy(bp);
 	}
 
 	return freed;
@@ -1670,6 +1590,7 @@ xfs_destroy_buftarg(
 	ASSERT(percpu_counter_sum(&btp->bt_readahead_count) == 0);
 	percpu_counter_destroy(&btp->bt_readahead_count);
 	list_lru_destroy(&btp->bt_lru);
+	rhashtable_destroy(&btp->bt_hash);
 }
 
 void
@@ -1764,8 +1685,10 @@ xfs_init_buftarg(
 	ratelimit_state_init(&btp->bt_ioerror_rl, 30 * HZ,
 			     DEFAULT_RATELIMIT_BURST);
 
-	if (list_lru_init(&btp->bt_lru))
+	if (rhashtable_init(&btp->bt_hash, &xfs_buf_hash_params))
 		return -ENOMEM;
+	if (list_lru_init(&btp->bt_lru))
+		goto out_destroy_hash;
 	if (percpu_counter_init(&btp->bt_readahead_count, 0, GFP_KERNEL))
 		goto out_destroy_lru;
 
@@ -1783,6 +1706,8 @@ out_destroy_io_count:
 	percpu_counter_destroy(&btp->bt_readahead_count);
 out_destroy_lru:
 	list_lru_destroy(&btp->bt_lru);
+out_destroy_hash:
+	rhashtable_destroy(&btp->bt_hash);
 	return -ENOMEM;
 }
 
@@ -1831,6 +1756,7 @@ xfs_alloc_buftarg(
 	return btp;
 
 error_free:
+	fs_put_dax(btp->bt_daxdev, mp);
 	kfree(btp);
 	return ERR_PTR(error);
 }
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index e25cd2a160f3..bf39d89f0f6d 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -14,6 +14,7 @@
 #include <linux/dax.h>
 #include <linux/uio.h>
 #include <linux/list_lru.h>
+#include <linux/lockref.h>
 
 extern struct kmem_cache *xfs_buf_cache;
 
@@ -68,18 +69,6 @@ typedef unsigned int xfs_buf_flags_t;
 	{ XBF_INCORE,		"INCORE" }, \
 	{ XBF_TRYLOCK,		"TRYLOCK" }
 
-/*
- * Internal state flags.
- */
-#define XFS_BSTATE_DISPOSE	 (1 << 0)	/* buffer being discarded */
-
-struct xfs_buf_cache {
-	struct rhashtable	bc_hash;
-};
-
-int xfs_buf_cache_init(struct xfs_buf_cache *bch);
-void xfs_buf_cache_destroy(struct xfs_buf_cache *bch);
-
 /*
  * The xfs_buftarg contains 2 notions of "sector size" -
  *
@@ -117,8 +106,7 @@ struct xfs_buftarg {
 	unsigned int		bt_awu_min;
 	unsigned int		bt_awu_max;
 
-	/* built-in cache, if we're not using the perag one */
-	struct xfs_buf_cache	bt_cache[];
+	struct rhashtable	bt_hash;
 };
 
 struct xfs_buf_map {
@@ -159,7 +147,7 @@ struct xfs_buf {
 
 	xfs_daddr_t		b_rhash_key;	/* buffer cache index */
 	int			b_length;	/* size of buffer in BBs */
-	unsigned int		b_hold;		/* reference count */
+	struct lockref		b_lockref;	/* refcount + lock */
 	atomic_t		b_lru_ref;	/* lru reclaim ref count */
 	xfs_buf_flags_t		b_flags;	/* status flags */
 	struct semaphore	b_sema;		/* semaphore for lockables */
@@ -169,8 +157,6 @@ struct xfs_buf {
 	 * bt_lru_lock and not by b_sema
 	 */
 	struct list_head	b_lru;		/* lru list */
-	spinlock_t		b_lock;		/* internal state lock */
-	unsigned int		b_state;	/* internal state flags */
 	wait_queue_head_t	b_waiters;	/* unpin waiters */
 	struct list_head	b_list;
 	struct xfs_perag	*b_pag;
diff --git a/fs/xfs/xfs_buf_mem.c b/fs/xfs/xfs_buf_mem.c
index b0b3696bf599..b2fd7276b131 100644
--- a/fs/xfs/xfs_buf_mem.c
+++ b/fs/xfs/xfs_buf_mem.c
@@ -58,7 +58,7 @@ xmbuf_alloc(
 	struct xfs_buftarg	*btp;
 	int			error;
 
-	btp = kzalloc_flex(*btp, bt_cache, 1);
+	btp = kzalloc_obj(*btp);
 	if (!btp)
 		return -ENOMEM;
 
@@ -81,10 +81,6 @@ xmbuf_alloc(
 	/* ensure all writes are below EOF to avoid pagecache zeroing */
 	i_size_write(inode, inode->i_sb->s_maxbytes);
 
-	error = xfs_buf_cache_init(btp->bt_cache);
-	if (error)
-		goto out_file;
-
 	/* Initialize buffer target */
 	btp->bt_mount = mp;
 	btp->bt_dev = (dev_t)-1U;
@@ -95,15 +91,13 @@ xmbuf_alloc(
 
 	error = xfs_init_buftarg(btp, XMBUF_BLOCKSIZE, descr);
 	if (error)
-		goto out_bcache;
+		goto out_file;
 
 	trace_xmbuf_create(btp);
 
 	*btpp = btp;
 	return 0;
 
-out_bcache:
-	xfs_buf_cache_destroy(btp->bt_cache);
 out_file:
 	fput(file);
 out_free_btp:
@@ -122,7 +116,6 @@ xmbuf_free(
 	trace_xmbuf_free(btp);
 
 	xfs_destroy_buftarg(btp);
-	xfs_buf_cache_destroy(btp->bt_cache);
 	fput(btp->bt_file);
 	kfree(btp);
 }
diff --git a/fs/xfs/xfs_extent_busy.c b/fs/xfs/xfs_extent_busy.c
index 3efdca3d675b..41cf0605ec22 100644
--- a/fs/xfs/xfs_extent_busy.c
+++ b/fs/xfs/xfs_extent_busy.c
@@ -690,9 +690,9 @@ xfs_extent_busy_ag_cmp(
 		container_of(l2, struct xfs_extent_busy, list);
 	s32 diff;
 
-	diff = b1->group->xg_gno - b2->group->xg_gno;
+	diff = cmp_int(b1->group->xg_gno, b2->group->xg_gno);
 	if (!diff)
-		diff = b1->bno - b2->bno;
+		diff = cmp_int(b1->bno, b2->bno);
 	return diff;
 }
 
diff --git a/fs/xfs/xfs_extfree_item.c b/fs/xfs/xfs_extfree_item.c
index 749a4eb9793c..2266d56e37dc 100644
--- a/fs/xfs/xfs_extfree_item.c
+++ b/fs/xfs/xfs_extfree_item.c
@@ -387,7 +387,7 @@ xfs_extent_free_diff_items(
 	struct xfs_extent_free_item	*ra = xefi_entry(a);
 	struct xfs_extent_free_item	*rb = xefi_entry(b);
 
-	return ra->xefi_group->xg_gno - rb->xefi_group->xg_gno;
+	return cmp_int(ra->xefi_group->xg_gno, rb->xefi_group->xg_gno);
 }
 
 /* Log a free extent to the intent item. */
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 6246f34df9fd..845a97c9b063 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -560,6 +560,72 @@ xfs_zoned_write_space_reserve(
 			flags, ac);
 }
 
+/*
+ * We need to lock the test/set EOF update as we can be racing with
+ * other IO completions here to update the EOF. Failing to serialise
+ * here can result in EOF moving backwards and Bad Things Happen when
+ * that occurs.
+ *
+ * As IO completion only ever extends EOF, we can do an unlocked check
+ * here to avoid taking the spinlock. If we land within the current EOF,
+ * then we do not need to do an extending update at all, and we don't
+ * need to take the lock to check this. If we race with an update moving
+ * EOF, then we'll either still be beyond EOF and need to take the lock,
+ * or we'll be within EOF and we don't need to take it at all.
+ */
+static int
+xfs_dio_endio_set_isize(
+	struct inode		*inode,
+	loff_t			offset,
+	ssize_t			size)
+{
+	struct xfs_inode	*ip = XFS_I(inode);
+
+	if (offset + size <= i_size_read(inode))
+		return 0;
+
+	spin_lock(&ip->i_flags_lock);
+	if (offset + size <= i_size_read(inode)) {
+		spin_unlock(&ip->i_flags_lock);
+		return 0;
+	}
+
+	i_size_write(inode, offset + size);
+	spin_unlock(&ip->i_flags_lock);
+
+	return xfs_setfilesize(ip, offset, size);
+}
+
+static int
+xfs_zoned_dio_write_end_io(
+	struct kiocb		*iocb,
+	ssize_t			size,
+	int			error,
+	unsigned		flags)
+{
+	struct inode		*inode = file_inode(iocb->ki_filp);
+	struct xfs_inode	*ip = XFS_I(inode);
+	unsigned int		nofs_flag;
+
+	ASSERT(!(flags & (IOMAP_DIO_UNWRITTEN | IOMAP_DIO_COW)));
+
+	trace_xfs_end_io_direct_write(ip, iocb->ki_pos, size);
+
+	if (xfs_is_shutdown(ip->i_mount))
+		return -EIO;
+
+	if (error || !size)
+		return error;
+
+	XFS_STATS_ADD(ip->i_mount, xs_write_bytes, size);
+
+	nofs_flag = memalloc_nofs_save();
+	error = xfs_dio_endio_set_isize(inode, iocb->ki_pos, size);
+	memalloc_nofs_restore(nofs_flag);
+
+	return error;
+}
+
 static int
 xfs_dio_write_end_io(
 	struct kiocb		*iocb,
@@ -572,8 +638,7 @@ xfs_dio_write_end_io(
 	loff_t			offset = iocb->ki_pos;
 	unsigned int		nofs_flag;
 
-	ASSERT(!xfs_is_zoned_inode(ip) ||
-	       !(flags & (IOMAP_DIO_UNWRITTEN | IOMAP_DIO_COW)));
+	ASSERT(!xfs_is_zoned_inode(ip));
 
 	trace_xfs_end_io_direct_write(ip, offset, size);
 
@@ -623,30 +688,8 @@ xfs_dio_write_end_io(
 	 * with the on-disk inode size being outside the in-core inode size. We
 	 * have no other method of updating EOF for AIO, so always do it here
 	 * if necessary.
-	 *
-	 * We need to lock the test/set EOF update as we can be racing with
-	 * other IO completions here to update the EOF. Failing to serialise
-	 * here can result in EOF moving backwards and Bad Things Happen when
-	 * that occurs.
-	 *
-	 * As IO completion only ever extends EOF, we can do an unlocked check
-	 * here to avoid taking the spinlock. If we land within the current EOF,
-	 * then we do not need to do an extending update at all, and we don't
-	 * need to take the lock to check this. If we race with an update moving
-	 * EOF, then we'll either still be beyond EOF and need to take the lock,
-	 * or we'll be within EOF and we don't need to take it at all.
 	 */
-	if (offset + size <= i_size_read(inode))
-		goto out;
-
-	spin_lock(&ip->i_flags_lock);
-	if (offset + size > i_size_read(inode)) {
-		i_size_write(inode, offset + size);
-		spin_unlock(&ip->i_flags_lock);
-		error = xfs_setfilesize(ip, offset, size);
-	} else {
-		spin_unlock(&ip->i_flags_lock);
-	}
+	error = xfs_dio_endio_set_isize(inode, offset, size);
 
 out:
 	memalloc_nofs_restore(nofs_flag);
@@ -688,7 +731,7 @@ xfs_dio_zoned_submit_io(
 static const struct iomap_dio_ops xfs_dio_zoned_write_ops = {
 	.bio_set	= &iomap_ioend_bioset,
 	.submit_io	= xfs_dio_zoned_submit_io,
-	.end_io		= xfs_dio_write_end_io,
+	.end_io		= xfs_zoned_dio_write_end_io,
 };
 
 /*
@@ -1263,6 +1306,23 @@ xfs_falloc_insert_range(
 	if (offset >= isize)
 		return -EINVAL;
 
+	/*
+	 * Let writeback clean up EOF folio state before we bump i_size. The
+	 * insert flushes before it starts shifting and under certain
+	 * circumstances we can write back blocks that should technically be
+	 * considered post-eof (and thus should not be submitted for writeback).
+	 *
+	 * For example, a large, dirty folio that spans EOF and is backed by
+	 * post-eof COW fork preallocation can cause block remap into the data
+	 * fork. This shifts back out beyond EOF, but creates an expectedly
+	 * written post-eof block. The insert is going to flush, unmap and
+	 * cancel prealloc across this whole range, so flush EOF now before we
+	 * bump i_size to provide consistent behavior.
+	 */
+	error = filemap_write_and_wait_range(inode->i_mapping, isize, isize);
+	if (error)
+		return error;
+
 	error = xfs_falloc_setsize(file, isize + len);
 	if (error)
 		return error;
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index facffdc8dca8..46e234863644 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -37,12 +37,15 @@
 #include "xfs_ioctl.h"
 #include "xfs_xattr.h"
 #include "xfs_rtbitmap.h"
+#include "xfs_rtrmap_btree.h"
 #include "xfs_file.h"
 #include "xfs_exchrange.h"
 #include "xfs_handle.h"
 #include "xfs_rtgroup.h"
 #include "xfs_healthmon.h"
 #include "xfs_verify_media.h"
+#include "xfs_zone_priv.h"
+#include "xfs_zone_alloc.h"
 
 #include <linux/mount.h>
 #include <linux/fileattr.h>
@@ -413,6 +416,7 @@ xfs_ioc_rtgroup_geometry(
 {
 	struct xfs_rtgroup	*rtg;
 	struct xfs_rtgroup_geometry rgeo;
+	xfs_rgblock_t		highest_rgbno;
 	int			error;
 
 	if (copy_from_user(&rgeo, arg, sizeof(rgeo)))
@@ -433,6 +437,21 @@ xfs_ioc_rtgroup_geometry(
 	if (error)
 		return error;
 
+	if (xfs_has_zoned(mp)) {
+		xfs_rtgroup_lock(rtg, XFS_RTGLOCK_RMAP);
+		if (rtg->rtg_open_zone) {
+			rgeo.rg_writepointer = rtg->rtg_open_zone->oz_allocated;
+		} else {
+			highest_rgbno = xfs_rtrmap_highest_rgbno(rtg);
+			if (highest_rgbno == NULLRGBLOCK)
+				rgeo.rg_writepointer = 0;
+			else
+				rgeo.rg_writepointer = highest_rgbno + 1;
+		}
+		xfs_rtgroup_unlock(rtg, XFS_RTGLOCK_RMAP);
+		rgeo.rg_flags |= XFS_RTGROUP_GEOM_WRITEPOINTER;
+	}
+
 	if (copy_to_user(arg, &rgeo, sizeof(rgeo)))
 		return -EFAULT;
 	return 0;
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 9c2f12d5fec9..f20a02f49ed9 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -1593,6 +1593,7 @@ xfs_zoned_buffered_write_iomap_begin(
 {
 	struct iomap_iter	*iter =
 		container_of(iomap, struct iomap_iter, iomap);
+	struct address_space	*mapping = inode->i_mapping;
 	struct xfs_zone_alloc_ctx *ac = iter->private;
 	struct xfs_inode	*ip = XFS_I(inode);
 	struct xfs_mount	*mp = ip->i_mount;
@@ -1617,6 +1618,7 @@ xfs_zoned_buffered_write_iomap_begin(
 	if (error)
 		return error;
 
+restart:
 	error = xfs_ilock_for_iomap(ip, flags, &lockmode);
 	if (error)
 		return error;
@@ -1654,14 +1656,6 @@ xfs_zoned_buffered_write_iomap_begin(
 				&smap))
 			smap.br_startoff = end_fsb; /* fake hole until EOF */
 		if (smap.br_startoff > offset_fsb) {
-			/*
-			 * We never need to allocate blocks for zeroing a hole.
-			 */
-			if (flags & IOMAP_ZERO) {
-				xfs_hole_to_iomap(ip, iomap, offset_fsb,
-						smap.br_startoff);
-				goto out_unlock;
-			}
 			end_fsb = min(end_fsb, smap.br_startoff);
 		} else {
 			end_fsb = min(end_fsb,
@@ -1693,6 +1687,33 @@ xfs_zoned_buffered_write_iomap_begin(
 	count_fsb = min3(end_fsb - offset_fsb, XFS_MAX_BMBT_EXTLEN,
 			 XFS_B_TO_FSB(mp, 1024 * PAGE_SIZE));
 
+	/*
+	 * When zeroing, don't allocate blocks for holes as they are already
+	 * zeroes, but we need to ensure that no extents exist in both the data
+	 * and COW fork to ensure this really is a hole.
+	 *
+	 * A window exists where we might observe a hole in both forks with
+	 * valid data in cache. Writeback removes the COW fork blocks on
+	 * submission but doesn't remap into the data fork until completion. If
+	 * the data fork was previously a hole, we'll fail to zero. Until we
+	 * find a way to avoid this transient state, check for dirty pagecache
+	 * and flush to wait on blocks to land in the data fork.
+	 */
+	if ((flags & IOMAP_ZERO) && srcmap->type == IOMAP_HOLE) {
+		if (filemap_range_needs_writeback(mapping, offset,
+				offset + count - 1)) {
+			xfs_iunlock(ip, lockmode);
+			error = filemap_write_and_wait_range(mapping, offset,
+					offset + count - 1);
+			if (error)
+				return error;
+			goto restart;
+		}
+
+		xfs_hole_to_iomap(ip, iomap, offset_fsb, end_fsb);
+		goto out_unlock;
+	}
+
 	/*
 	 * The block reservation is supposed to cover all blocks that the
 	 * operation could possible write, but there is a nasty corner case
@@ -1767,6 +1788,8 @@ xfs_buffered_write_iomap_begin(
 	struct xfs_mount	*mp = ip->i_mount;
 	xfs_fileoff_t		offset_fsb = XFS_B_TO_FSBT(mp, offset);
 	xfs_fileoff_t		end_fsb = xfs_iomap_end_fsb(mp, offset, count);
+	xfs_fileoff_t		cow_fsb = NULLFILEOFF;
+	xfs_fileoff_t		eof_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip));
 	struct xfs_bmbt_irec	imap, cmap;
 	struct xfs_iext_cursor	icur, ccur;
 	xfs_fsblock_t		prealloc_blocks = 0;
@@ -1811,30 +1834,96 @@ xfs_buffered_write_iomap_begin(
 		goto out_unlock;
 
 	/*
-	 * Search the data fork first to look up our source mapping.  We
-	 * always need the data fork map, as we have to return it to the
-	 * iomap code so that the higher level write code can read data in to
-	 * perform read-modify-write cycles for unaligned writes.
+	 * Search the data fork first to look up our source mapping. We always
+	 * need the data fork map, as we have to return it to the iomap code so
+	 * that the higher level write code can read data in to perform
+	 * read-modify-write cycles for unaligned writes.
+	 *
+	 * Then search the COW fork extent list even if we did not find a data
+	 * fork extent. This serves two purposes: first this implements the
+	 * speculative preallocation using cowextsize, so that we also unshare
+	 * block adjacent to shared blocks instead of just the shared blocks
+	 * themselves. Second the lookup in the extent list is generally faster
+	 * than going out to the shared extent tree.
 	 */
 	eof = !xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap);
 	if (eof)
 		imap.br_startoff = end_fsb; /* fake hole until the end */
+	if (xfs_is_cow_inode(ip)) {
+		if (!ip->i_cowfp) {
+			ASSERT(!xfs_is_reflink_inode(ip));
+			xfs_ifork_init_cow(ip);
+		}
+		cow_eof = !xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb,
+				&ccur, &cmap);
+		if (!cow_eof)
+			cow_fsb = cmap.br_startoff;
+	}
 
-	/* We never need to allocate blocks for zeroing or unsharing a hole. */
-	if ((flags & (IOMAP_UNSHARE | IOMAP_ZERO)) &&
-	    imap.br_startoff > offset_fsb) {
+	/* We never need to allocate blocks for unsharing a hole. */
+	if ((flags & IOMAP_UNSHARE) && imap.br_startoff > offset_fsb) {
 		xfs_hole_to_iomap(ip, iomap, offset_fsb, imap.br_startoff);
 		goto out_unlock;
 	}
 
+	/*
+	 * We may need to zero over a hole in the data fork if it's fronted by
+	 * COW blocks and dirty pagecache. Scan such file ranges for dirty
+	 * cache and fill the iomap batch with folios that need zeroing.
+	 */
+	if ((flags & IOMAP_ZERO) && imap.br_startoff > offset_fsb) {
+		loff_t		start, end;
+		unsigned int	fbatch_count;
+
+		imap.br_blockcount = imap.br_startoff - offset_fsb;
+		imap.br_startoff = offset_fsb;
+		imap.br_startblock = HOLESTARTBLOCK;
+		imap.br_state = XFS_EXT_NORM;
+
+		if (cow_fsb == NULLFILEOFF)
+			goto found_imap;
+		if (cow_fsb > offset_fsb) {
+			xfs_trim_extent(&imap, offset_fsb,
+					cow_fsb - offset_fsb);
+			goto found_imap;
+		}
+
+		/* no zeroing beyond eof, so split at the boundary */
+		if (offset_fsb >= eof_fsb)
+			goto found_imap;
+		if (offset_fsb < eof_fsb && end_fsb > eof_fsb)
+			xfs_trim_extent(&imap, offset_fsb,
+					eof_fsb - offset_fsb);
+
+		/* COW fork blocks overlap the hole */
+		xfs_trim_extent(&imap, offset_fsb,
+			    cmap.br_startoff + cmap.br_blockcount - offset_fsb);
+		start = XFS_FSB_TO_B(mp, imap.br_startoff);
+		end = XFS_FSB_TO_B(mp, imap.br_startoff + imap.br_blockcount);
+		fbatch_count = iomap_fill_dirty_folios(iter, &start, end,
+						       &iomap_flags);
+		xfs_trim_extent(&imap, offset_fsb,
+				XFS_B_TO_FSB(mp, start) - offset_fsb);
+
+		/*
+		 * Report the COW mapping if we have folios to zero. Otherwise
+		 * ignore the COW blocks as preallocation and report a hole.
+		 */
+		if (fbatch_count) {
+			xfs_trim_extent(&cmap, imap.br_startoff,
+					imap.br_blockcount);
+			imap.br_startoff = end_fsb;	/* fake hole */
+			goto found_cow;
+		}
+		goto found_imap;
+	}
+
 	/*
 	 * For zeroing, trim extents that extend beyond the EOF block. If a
 	 * delalloc extent starts beyond the EOF block, convert it to an
 	 * unwritten extent.
 	 */
 	if (flags & IOMAP_ZERO) {
-		xfs_fileoff_t eof_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip));
-
 		if (isnullstartblock(imap.br_startblock) &&
 		    offset_fsb >= eof_fsb)
 			goto convert_delay;
@@ -1867,24 +1956,13 @@ xfs_buffered_write_iomap_begin(
 	}
 
 	/*
-	 * Search the COW fork extent list even if we did not find a data fork
-	 * extent.  This serves two purposes: first this implements the
-	 * speculative preallocation using cowextsize, so that we also unshare
-	 * block adjacent to shared blocks instead of just the shared blocks
-	 * themselves.  Second the lookup in the extent list is generally faster
-	 * than going out to the shared extent tree.
+	 * Now that we've handled any operation specific special cases, at this
+	 * point we can report a COW mapping if found.
 	 */
-	if (xfs_is_cow_inode(ip)) {
-		if (!ip->i_cowfp) {
-			ASSERT(!xfs_is_reflink_inode(ip));
-			xfs_ifork_init_cow(ip);
-		}
-		cow_eof = !xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb,
-				&ccur, &cmap);
-		if (!cow_eof && cmap.br_startoff <= offset_fsb) {
-			trace_xfs_reflink_cow_found(ip, &cmap);
-			goto found_cow;
-		}
+	if (xfs_is_cow_inode(ip) &&
+	    !cow_eof && cmap.br_startoff <= offset_fsb) {
+		trace_xfs_reflink_cow_found(ip, &cmap);
+		goto found_cow;
 	}
 
 	if (imap.br_startoff <= offset_fsb) {
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 208543e57eda..325c2200c501 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -901,20 +901,18 @@ out_dqrele:
 
 /*
  * Truncate file.  Must have write permission and not be a directory.
- *
- * Caution: The caller of this function is responsible for calling
- * setattr_prepare() or otherwise verifying the change is fine.
  */
-STATIC int
-xfs_setattr_size(
+int
+xfs_vn_setattr_size(
 	struct mnt_idmap	*idmap,
 	struct dentry		*dentry,
-	struct xfs_inode	*ip,
 	struct iattr		*iattr)
 {
+	struct inode		*inode = d_inode(dentry);
+	struct xfs_inode	*ip = XFS_I(inode);
 	struct xfs_mount	*mp = ip->i_mount;
-	struct inode		*inode = VFS_I(ip);
-	xfs_off_t		oldsize, newsize;
+	xfs_off_t		oldsize = inode->i_size;
+	xfs_off_t		newsize = iattr->ia_size;
 	struct xfs_trans	*tp;
 	int			error;
 	uint			lock_flags = 0;
@@ -927,8 +925,11 @@ xfs_setattr_size(
 	ASSERT((iattr->ia_valid & (ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
 		ATTR_MTIME_SET|ATTR_TIMES_SET)) == 0);
 
-	oldsize = inode->i_size;
-	newsize = iattr->ia_size;
+	trace_xfs_setattr(ip);
+
+	error = xfs_vn_change_ok(idmap, dentry, iattr);
+	if (error)
+		return error;
 
 	/*
 	 * Short circuit the truncate case for zero length files.
@@ -1109,7 +1110,6 @@ xfs_setattr_size(
 		xfs_inode_clear_eofblocks_tag(ip);
 	}
 
-	ASSERT(!(iattr->ia_valid & (ATTR_UID | ATTR_GID)));
 	setattr_copy(idmap, inode, iattr);
 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 
@@ -1129,23 +1129,6 @@ out_trans_cancel:
 	goto out_unlock;
 }
 
-int
-xfs_vn_setattr_size(
-	struct mnt_idmap	*idmap,
-	struct dentry		*dentry,
-	struct iattr		*iattr)
-{
-	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
-	int error;
-
-	trace_xfs_setattr(ip);
-
-	error = xfs_vn_change_ok(idmap, dentry, iattr);
-	if (error)
-		return error;
-	return xfs_setattr_size(idmap, dentry, ip, iattr);
-}
-
 STATIC int
 xfs_vn_setattr(
 	struct mnt_idmap	*idmap,
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index ef1ea8a1238c..b24195f570cd 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -44,17 +44,36 @@
 #include "xfs_healthmon.h"
 
 static DEFINE_MUTEX(xfs_uuid_table_mutex);
-static int xfs_uuid_table_size;
-static uuid_t *xfs_uuid_table;
+static DEFINE_XARRAY_ALLOC(xfs_uuid_table);
+
+static uuid_t *
+xfs_uuid_search(
+	uuid_t		*new_uuid)
+{
+	unsigned long	index = 0;
+	uuid_t		*uuid;
+
+	xa_for_each(&xfs_uuid_table, index, uuid) {
+		if (uuid_equal(uuid, new_uuid))
+			return uuid;
+	}
+	return NULL;
+}
+
+static void
+xfs_uuid_delete(
+	uuid_t		*uuid,
+	unsigned int	index)
+{
+	ASSERT(uuid_equal(xa_load(&xfs_uuid_table, index), uuid));
+	xa_erase(&xfs_uuid_table, index);
+}
 
 void
 xfs_uuid_table_free(void)
 {
-	if (xfs_uuid_table_size == 0)
-		return;
-	kfree(xfs_uuid_table);
-	xfs_uuid_table = NULL;
-	xfs_uuid_table_size = 0;
+	ASSERT(xa_empty(&xfs_uuid_table));
+	xa_destroy(&xfs_uuid_table);
 }
 
 /*
@@ -66,7 +85,7 @@ xfs_uuid_mount(
 	struct xfs_mount	*mp)
 {
 	uuid_t			*uuid = &mp->m_sb.sb_uuid;
-	int			hole, i;
+	int			ret;
 
 	/* Publish UUID in struct super_block */
 	super_set_uuid(mp->m_super, uuid->b, sizeof(*uuid));
@@ -80,30 +99,17 @@ xfs_uuid_mount(
 	}
 
 	mutex_lock(&xfs_uuid_table_mutex);
-	for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) {
-		if (uuid_is_null(&xfs_uuid_table[i])) {
-			hole = i;
-			continue;
-		}
-		if (uuid_equal(uuid, &xfs_uuid_table[i]))
-			goto out_duplicate;
+	if (unlikely(xfs_uuid_search(uuid))) {
+		xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount",
+				uuid);
+		mutex_unlock(&xfs_uuid_table_mutex);
+		return -EINVAL;
 	}
 
-	if (hole < 0) {
-		xfs_uuid_table = krealloc(xfs_uuid_table,
-			(xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table),
-			GFP_KERNEL | __GFP_NOFAIL);
-		hole = xfs_uuid_table_size++;
-	}
-	xfs_uuid_table[hole] = *uuid;
+	ret = xa_alloc(&xfs_uuid_table, &mp->m_uuid_table_index, uuid,
+				xa_limit_32b, GFP_KERNEL);
 	mutex_unlock(&xfs_uuid_table_mutex);
-
-	return 0;
-
- out_duplicate:
-	mutex_unlock(&xfs_uuid_table_mutex);
-	xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid);
-	return -EINVAL;
+	return ret;
 }
 
 STATIC void
@@ -111,21 +117,12 @@ xfs_uuid_unmount(
 	struct xfs_mount	*mp)
 {
 	uuid_t			*uuid = &mp->m_sb.sb_uuid;
-	int			i;
 
 	if (xfs_has_nouuid(mp))
 		return;
 
 	mutex_lock(&xfs_uuid_table_mutex);
-	for (i = 0; i < xfs_uuid_table_size; i++) {
-		if (uuid_is_null(&xfs_uuid_table[i]))
-			continue;
-		if (!uuid_equal(uuid, &xfs_uuid_table[i]))
-			continue;
-		memset(&xfs_uuid_table[i], 0, sizeof(uuid_t));
-		break;
-	}
-	ASSERT(i < xfs_uuid_table_size);
+	xfs_uuid_delete(uuid, mp->m_uuid_table_index);
 	mutex_unlock(&xfs_uuid_table_mutex);
 }
 
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index ddd4028be8d6..d964bae096ef 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -346,6 +346,9 @@ typedef struct xfs_mount {
 
 	/* Private data referring to a health monitor object. */
 	struct xfs_healthmon __rcu	*m_healthmon;
+
+	/* Index of uuid record in the uuid xarray. */
+	unsigned int		m_uuid_table_index;
 } xfs_mount_t;
 
 #define M_IGEO(mp)		(&(mp)->m_ino_geo)
diff --git a/fs/xfs/xfs_qm_syscalls.c b/fs/xfs/xfs_qm_syscalls.c
index d50b7318cb5c..21a784986828 100644
--- a/fs/xfs/xfs_qm_syscalls.c
+++ b/fs/xfs/xfs_qm_syscalls.c
@@ -391,6 +391,38 @@ out_rele:
 	return error;
 }
 
+/*
+ * Fill out the default quota limits for an ID that has no dquot on disk.
+ * Returns 0 if default limits are configured
+ * and were filled in, -ENOENT otherwise.
+ */
+static int
+xfs_qm_scall_getquota_fill_defaults(
+	struct xfs_mount	*mp,
+	xfs_dqtype_t		type,
+	struct qc_dqblk		*dst)
+{
+	struct xfs_def_quota	*defq;
+
+	defq = xfs_get_defquota(mp->m_quotainfo, type);
+
+	if (!defq->blk.soft && !defq->blk.hard &&
+	    !defq->ino.soft && !defq->ino.hard &&
+	    !defq->rtb.soft && !defq->rtb.hard) {
+		return -ENOENT;
+	}
+
+	memset(dst, 0, sizeof(*dst));
+	dst->d_spc_softlimit = XFS_FSB_TO_B(mp, defq->blk.soft);
+	dst->d_spc_hardlimit = XFS_FSB_TO_B(mp, defq->blk.hard);
+	dst->d_ino_softlimit = defq->ino.soft;
+	dst->d_ino_hardlimit = defq->ino.hard;
+	dst->d_rt_spc_softlimit = XFS_FSB_TO_B(mp, defq->rtb.soft);
+	dst->d_rt_spc_hardlimit = XFS_FSB_TO_B(mp, defq->rtb.hard);
+
+	return 0;
+}
+
 /* Fill out the quota context. */
 static void
 xfs_qm_scall_getquota_fill_qc(
@@ -451,8 +483,17 @@ xfs_qm_scall_getquota(
 	 * set doalloc. If it doesn't exist, we'll get ENOENT back.
 	 */
 	error = xfs_qm_dqget(mp, id, type, false, &dqp);
-	if (error)
+	if (error) {
+		/*
+		 * If there is no dquot on disk and default limits are
+		 * configured, return them with zero usage so that
+		 * unprivileged users can see what limits apply to them.
+		 */
+		if (error == -ENOENT && id != 0 &&
+		    !xfs_qm_scall_getquota_fill_defaults(mp, type, dst))
+			return 0;
 		return error;
+	}
 
 	/*
 	 * If everything's NULL, this dquot doesn't quite exist as far as
diff --git a/fs/xfs/xfs_refcount_item.c b/fs/xfs/xfs_refcount_item.c
index 881c3f3a6a24..8bccf89a7766 100644
--- a/fs/xfs/xfs_refcount_item.c
+++ b/fs/xfs/xfs_refcount_item.c
@@ -266,7 +266,7 @@ xfs_refcount_update_diff_items(
 	struct xfs_refcount_intent	*ra = ci_entry(a);
 	struct xfs_refcount_intent	*rb = ci_entry(b);
 
-	return ra->ri_group->xg_gno - rb->ri_group->xg_gno;
+	return cmp_int(ra->ri_group->xg_gno, rb->ri_group->xg_gno);
 }
 
 /* Log refcount updates in the intent item. */
diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c
index a39fe08dcd8f..2a3a73a8566d 100644
--- a/fs/xfs/xfs_rmap_item.c
+++ b/fs/xfs/xfs_rmap_item.c
@@ -267,7 +267,7 @@ xfs_rmap_update_diff_items(
 	struct xfs_rmap_intent		*ra = ri_entry(a);
 	struct xfs_rmap_intent		*rb = ri_entry(b);
 
-	return ra->ri_group->xg_gno - rb->ri_group->xg_gno;
+	return cmp_int(ra->ri_group->xg_gno, rb->ri_group->xg_gno);
 }
 
 /* Log rmap updates in the intent item. */
diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 6c7909838234..676777064c2d 100644
--- a/fs/xfs/xfs_sysfs.c
+++ b/fs/xfs/xfs_sysfs.c
@@ -13,7 +13,9 @@
 #include "xfs_log.h"
 #include "xfs_log_priv.h"
 #include "xfs_mount.h"
+#include "xfs_zone_priv.h"
 #include "xfs_zones.h"
+#include "xfs_zone_alloc.h"
 
 struct xfs_sysfs_attr {
 	struct attribute attr;
@@ -718,12 +720,24 @@ max_open_zones_show(
 }
 XFS_SYSFS_ATTR_RO(max_open_zones);
 
+static ssize_t
+nr_open_zones_show(
+	struct kobject		*kobj,
+	char			*buf)
+{
+	struct xfs_zone_info	*zi = zoned_to_mp(kobj)->m_zone_info;
+
+	return sysfs_emit(buf, "%u\n", READ_ONCE(zi->zi_nr_open_zones));
+}
+XFS_SYSFS_ATTR_RO(nr_open_zones);
+
 static ssize_t
 zonegc_low_space_store(
 	struct kobject		*kobj,
 	const char		*buf,
 	size_t			count)
 {
+	struct xfs_mount	*mp = zoned_to_mp(kobj);
 	int			ret;
 	unsigned int		val;
 
@@ -734,7 +748,10 @@ zonegc_low_space_store(
 	if (val > 100)
 		return -EINVAL;
 
-	zoned_to_mp(kobj)->m_zonegc_low_space = val;
+	if (mp->m_zonegc_low_space != val) {
+		mp->m_zonegc_low_space = val;
+		xfs_zone_gc_wakeup(mp);
+	}
 
 	return count;
 }
@@ -751,6 +768,7 @@ XFS_SYSFS_ATTR_RW(zonegc_low_space);
 
 static struct attribute *xfs_zoned_attrs[] = {
 	ATTR_LIST(max_open_zones),
+	ATTR_LIST(nr_open_zones),
 	ATTR_LIST(zonegc_low_space),
 	NULL,
 };
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 5e8190fe2be9..1c098cfc5c00 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -394,6 +394,7 @@ DEFINE_ZONE_EVENT(xfs_zone_full);
 DEFINE_ZONE_EVENT(xfs_zone_opened);
 DEFINE_ZONE_EVENT(xfs_zone_reset);
 DEFINE_ZONE_EVENT(xfs_zone_gc_target_opened);
+DEFINE_ZONE_EVENT(xfs_zone_gc_target_stolen);
 
 TRACE_EVENT(xfs_zone_free_blocks,
 	TP_PROTO(struct xfs_rtgroup *rtg, xfs_rgblock_t rgbno,
@@ -461,6 +462,7 @@ DEFINE_EVENT(xfs_zone_alloc_class, name,			\
 DEFINE_ZONE_ALLOC_EVENT(xfs_zone_record_blocks);
 DEFINE_ZONE_ALLOC_EVENT(xfs_zone_skip_blocks);
 DEFINE_ZONE_ALLOC_EVENT(xfs_zone_alloc_blocks);
+DEFINE_ZONE_ALLOC_EVENT(xfs_zone_spurious_open);
 
 TRACE_EVENT(xfs_zone_gc_select_victim,
 	TP_PROTO(struct xfs_rtgroup *rtg, unsigned int bucket),
@@ -740,7 +742,7 @@ DECLARE_EVENT_CLASS(xfs_buf_class,
 		__entry->dev = bp->b_target->bt_dev;
 		__entry->bno = xfs_buf_daddr(bp);
 		__entry->nblks = bp->b_length;
-		__entry->hold = bp->b_hold;
+		__entry->hold = bp->b_lockref.count;
 		__entry->pincount = atomic_read(&bp->b_pin_count);
 		__entry->lockval = bp->b_sema.count;
 		__entry->flags = bp->b_flags;
@@ -814,7 +816,7 @@ DECLARE_EVENT_CLASS(xfs_buf_flags_class,
 		__entry->bno = xfs_buf_daddr(bp);
 		__entry->length = bp->b_length;
 		__entry->flags = flags;
-		__entry->hold = bp->b_hold;
+		__entry->hold = bp->b_lockref.count;
 		__entry->pincount = atomic_read(&bp->b_pin_count);
 		__entry->lockval = bp->b_sema.count;
 		__entry->caller_ip = caller_ip;
@@ -858,7 +860,7 @@ TRACE_EVENT(xfs_buf_ioerror,
 		__entry->dev = bp->b_target->bt_dev;
 		__entry->bno = xfs_buf_daddr(bp);
 		__entry->length = bp->b_length;
-		__entry->hold = bp->b_hold;
+		__entry->hold = bp->b_lockref.count;
 		__entry->pincount = atomic_read(&bp->b_pin_count);
 		__entry->lockval = bp->b_sema.count;
 		__entry->error = error;
@@ -902,7 +904,7 @@ DECLARE_EVENT_CLASS(xfs_buf_item_class,
 		__entry->buf_bno = xfs_buf_daddr(bip->bli_buf);
 		__entry->buf_len = bip->bli_buf->b_length;
 		__entry->buf_flags = bip->bli_buf->b_flags;
-		__entry->buf_hold = bip->bli_buf->b_hold;
+		__entry->buf_hold = bip->bli_buf->b_lockref.count;
 		__entry->buf_pincount = atomic_read(&bip->bli_buf->b_pin_count);
 		__entry->buf_lockval = bip->bli_buf->b_sema.count;
 		__entry->li_flags = bip->bli_item.li_flags;
@@ -5206,7 +5208,7 @@ DECLARE_EVENT_CLASS(xfbtree_buf_class,
 		__entry->xfino = file_inode(xfbt->target->bt_file)->i_ino;
 		__entry->bno = xfs_buf_daddr(bp);
 		__entry->nblks = bp->b_length;
-		__entry->hold = bp->b_hold;
+		__entry->hold = bp->b_lockref.count;
 		__entry->pincount = atomic_read(&bp->b_pin_count);
 		__entry->lockval = bp->b_sema.count;
 		__entry->flags = bp->b_flags;
diff --git a/fs/xfs/xfs_zone_alloc.c b/fs/xfs/xfs_zone_alloc.c
index e3d19b6dc64a..a851b98143c0 100644
--- a/fs/xfs/xfs_zone_alloc.c
+++ b/fs/xfs/xfs_zone_alloc.c
@@ -174,42 +174,33 @@ xfs_open_zone_mark_full(
 	WRITE_ONCE(rtg->rtg_open_zone, NULL);
 
 	spin_lock(&zi->zi_open_zones_lock);
-	if (oz->oz_is_gc) {
-		ASSERT(current == zi->zi_gc_thread);
-		zi->zi_open_gc_zone = NULL;
-	} else {
+	if (oz->oz_is_gc)
+		zi->zi_nr_open_gc_zones--;
+	else
 		zi->zi_nr_open_zones--;
-		list_del_init(&oz->oz_entry);
-	}
+	list_del_init(&oz->oz_entry);
 	spin_unlock(&zi->zi_open_zones_lock);
-	xfs_open_zone_put(oz);
 
-	wake_up_all(&zi->zi_zone_wait);
+	if (oz->oz_is_gc)
+		wake_up_process(zi->zi_gc_thread);
+	else
+		wake_up_all(&zi->zi_zone_wait);
+
 	if (used < rtg_blocks(rtg))
 		xfs_zone_account_reclaimable(rtg, rtg_blocks(rtg) - used);
+	xfs_open_zone_put(oz);
 }
 
-static void
-xfs_zone_record_blocks(
-	struct xfs_trans	*tp,
+static inline void
+xfs_zone_inc_written(
 	struct xfs_open_zone	*oz,
-	xfs_fsblock_t		fsbno,
 	xfs_filblks_t		len)
 {
-	struct xfs_mount	*mp = tp->t_mountp;
-	struct xfs_rtgroup	*rtg = oz->oz_rtg;
-	struct xfs_inode	*rmapip = rtg_rmap(rtg);
+	xfs_assert_ilocked(rtg_rmap(oz->oz_rtg), XFS_ILOCK_EXCL);
 
-	trace_xfs_zone_record_blocks(oz, xfs_rtb_to_rgbno(mp, fsbno), len);
-
-	xfs_rtgroup_lock(rtg, XFS_RTGLOCK_RMAP);
-	xfs_rtgroup_trans_join(tp, rtg, XFS_RTGLOCK_RMAP);
-	rmapip->i_used_blocks += len;
-	ASSERT(rmapip->i_used_blocks <= rtg_blocks(rtg));
 	oz->oz_written += len;
-	if (oz->oz_written == rtg_blocks(rtg))
+	if (oz->oz_written == rtg_blocks(oz->oz_rtg))
 		xfs_open_zone_mark_full(oz);
-	xfs_trans_log_inode(tp, rmapip, XFS_ILOG_CORE);
 }
 
 /*
@@ -227,9 +218,7 @@ xfs_zone_skip_blocks(
 	trace_xfs_zone_skip_blocks(oz, 0, len);
 
 	xfs_rtgroup_lock(rtg, XFS_RTGLOCK_RMAP);
-	oz->oz_written += len;
-	if (oz->oz_written == rtg_blocks(rtg))
-		xfs_open_zone_mark_full(oz);
+	xfs_zone_inc_written(oz, len);
 	xfs_rtgroup_unlock(rtg, XFS_RTGLOCK_RMAP);
 
 	xfs_add_frextents(rtg_mount(rtg), len);
@@ -244,6 +233,8 @@ xfs_zoned_map_extent(
 	xfs_fsblock_t		old_startblock)
 {
 	struct xfs_bmbt_irec	data;
+	struct xfs_rtgroup	*rtg = oz->oz_rtg;
+	struct xfs_inode	*rmapip = rtg_rmap(rtg);
 	int			nmaps = 1;
 	int			error;
 
@@ -302,7 +293,15 @@ xfs_zoned_map_extent(
 		}
 	}
 
-	xfs_zone_record_blocks(tp, oz, new->br_startblock, new->br_blockcount);
+	trace_xfs_zone_record_blocks(oz,
+		xfs_rtb_to_rgbno(tp->t_mountp, new->br_startblock),
+		new->br_blockcount);
+	xfs_rtgroup_lock(rtg, XFS_RTGLOCK_RMAP);
+	xfs_rtgroup_trans_join(tp, rtg, XFS_RTGLOCK_RMAP);
+	rmapip->i_used_blocks += new->br_blockcount;
+	ASSERT(rmapip->i_used_blocks <= rtg_blocks(rtg));
+	xfs_zone_inc_written(oz, new->br_blockcount);
+	xfs_trans_log_inode(tp, rmapip, XFS_ILOG_CORE);
 
 	/* Map the new blocks into the data fork. */
 	xfs_bmap_map_extent(tp, ip, XFS_DATA_FORK, new);
@@ -560,6 +559,9 @@ xfs_try_use_zone(
 	struct xfs_open_zone	*oz,
 	unsigned int		goodness)
 {
+	if (oz->oz_is_gc)
+		return false;
+
 	if (oz->oz_allocated == rtg_blocks(oz->oz_rtg))
 		return false;
 
@@ -681,10 +683,11 @@ xfs_select_zone_nowait(
 	if (oz)
 		goto out_unlock;
 
-	if (pack_tight)
+	if (pack_tight) {
 		oz = xfs_select_open_zone_mru(zi, write_hint);
-	if (oz)
-		goto out_unlock;
+		if (oz)
+			goto out_unlock;
+	}
 
 	/*
 	 * See if we can open a new zone and use that so that data for different
@@ -695,7 +698,7 @@ xfs_select_zone_nowait(
 		goto out_unlock;
 
 	/*
-	 * Try to find an zone that is an ok match to colocate data with.
+	 * Try to find a zone that is an ok match to colocate data with.
 	 */
 	oz = xfs_select_open_zone_lru(zi, write_hint, XFS_ZONE_ALLOC_OK);
 	if (oz)
@@ -1232,6 +1235,100 @@ xfs_free_zone_info(
 	kfree(zi);
 }
 
+static int
+xfs_report_zones(
+	struct xfs_mount	*mp,
+	struct xfs_init_zones	*iz)
+{
+	struct xfs_rtgroup	*rtg = NULL;
+
+	while ((rtg = xfs_rtgroup_next(mp, rtg))) {
+		xfs_rgblock_t		write_pointer;
+		int			error;
+
+		error = xfs_query_write_pointer(iz, rtg, &write_pointer);
+		if (!error)
+			error = xfs_init_zone(iz, rtg, write_pointer);
+		if (error) {
+			xfs_rtgroup_rele(rtg);
+			return error;
+		}
+	}
+
+	return 0;
+}
+
+static inline bool
+xfs_zone_is_conv(
+	struct xfs_rtgroup	*rtg)
+{
+	return !bdev_zone_is_seq(rtg_mount(rtg)->m_rtdev_targp->bt_bdev,
+			xfs_gbno_to_daddr(rtg_group(rtg), 0));
+}
+
+static struct xfs_open_zone *
+xfs_find_fullest_conventional_open_zone(
+	struct xfs_mount	*mp)
+{
+	struct xfs_zone_info	*zi = mp->m_zone_info;
+	struct xfs_open_zone	*found = NULL, *oz;
+
+	spin_lock(&zi->zi_open_zones_lock);
+	list_for_each_entry(oz, &zi->zi_open_zones, oz_entry) {
+		if (!xfs_zone_is_conv(oz->oz_rtg))
+			continue;
+		if (!found || oz->oz_allocated > found->oz_allocated)
+			found = oz;
+	}
+	spin_unlock(&zi->zi_open_zones_lock);
+
+	return found;
+}
+
+/*
+ * Find the fullest conventional zones and remove them from the open zone pool
+ * until we are at the open zone limit.
+ *
+ * We can end up with spurious "open" zones when the last blocks in a fully
+ * written zone were invalidate as there is no write pointer for conventional
+ * zones.
+ *
+ * If we are still over the limit when there is no conventional open zone left,
+ * the user overrode the max open zones limit using the max_open_zones mount
+ * option we should fail.
+ */
+static int
+xfs_finish_spurious_open_zones(
+	struct xfs_mount	*mp,
+	struct xfs_init_zones	*iz)
+{
+	struct xfs_zone_info	*zi = mp->m_zone_info;
+
+	while (zi->zi_nr_open_zones > mp->m_max_open_zones) {
+		struct xfs_open_zone	*oz;
+		xfs_filblks_t		adjust;
+
+		oz = xfs_find_fullest_conventional_open_zone(mp);
+		if (!oz) {
+			xfs_err(mp,
+"too many open zones for max_open_zones limit (%u/%u)",
+			zi->zi_nr_open_zones, mp->m_max_open_zones);
+			return -EINVAL;
+		}
+
+		xfs_rtgroup_lock(oz->oz_rtg, XFS_RTGLOCK_RMAP);
+		adjust = rtg_blocks(oz->oz_rtg) - oz->oz_written;
+		trace_xfs_zone_spurious_open(oz, oz->oz_written, adjust);
+		oz->oz_written = rtg_blocks(oz->oz_rtg);
+		xfs_open_zone_mark_full(oz);
+		xfs_rtgroup_unlock(oz->oz_rtg, XFS_RTGLOCK_RMAP);
+		iz->available -= adjust;
+		iz->reclaimable += adjust;
+	}
+
+	return 0;
+}
+
 int
 xfs_mount_zones(
 	struct xfs_mount	*mp)
@@ -1240,7 +1337,6 @@ xfs_mount_zones(
 		.zone_capacity	= mp->m_groups[XG_TYPE_RTG].blocks,
 		.zone_size	= xfs_rtgroup_raw_size(mp),
 	};
-	struct xfs_rtgroup	*rtg = NULL;
 	int			error;
 
 	if (!mp->m_rtdev_targp) {
@@ -1270,9 +1366,17 @@ xfs_mount_zones(
 	if (!mp->m_zone_info)
 		return -ENOMEM;
 
-	xfs_info(mp, "%u zones of %u blocks (%u max open zones)",
-		 mp->m_sb.sb_rgcount, iz.zone_capacity, mp->m_max_open_zones);
-	trace_xfs_zones_mount(mp);
+	error = xfs_report_zones(mp, &iz);
+	if (error)
+		goto out_free_zone_info;
+
+	error = xfs_finish_spurious_open_zones(mp, &iz);
+	if (error)
+		goto out_free_zone_info;
+
+	xfs_set_freecounter(mp, XC_FREE_RTAVAILABLE, iz.available);
+	xfs_set_freecounter(mp, XC_FREE_RTEXTENTS,
+			iz.available + iz.reclaimable);
 
 	/*
 	 * The writeback code switches between inodes regularly to provide
@@ -1298,22 +1402,6 @@ xfs_mount_zones(
 		XFS_FSB_TO_B(mp, min(iz.zone_capacity, XFS_MAX_BMBT_EXTLEN)) >>
 			PAGE_SHIFT;
 
-	while ((rtg = xfs_rtgroup_next(mp, rtg))) {
-		xfs_rgblock_t		write_pointer;
-
-		error = xfs_query_write_pointer(&iz, rtg, &write_pointer);
-		if (!error)
-			error = xfs_init_zone(&iz, rtg, write_pointer);
-		if (error) {
-			xfs_rtgroup_rele(rtg);
-			goto out_free_zone_info;
-		}
-	}
-
-	xfs_set_freecounter(mp, XC_FREE_RTAVAILABLE, iz.available);
-	xfs_set_freecounter(mp, XC_FREE_RTEXTENTS,
-			iz.available + iz.reclaimable);
-
 	/*
 	 * The user may configure GC to free up a percentage of unused blocks.
 	 * By default this is 0. GC will always trigger at the minimum level
@@ -1324,6 +1412,10 @@ xfs_mount_zones(
 	error = xfs_zone_gc_mount(mp);
 	if (error)
 		goto out_free_zone_info;
+
+	xfs_info(mp, "%u zones of %u blocks (%u max open zones)",
+		 mp->m_sb.sb_rgcount, iz.zone_capacity, mp->m_max_open_zones);
+	trace_xfs_zones_mount(mp);
 	return 0;
 
 out_free_zone_info:
diff --git a/fs/xfs/xfs_zone_alloc.h b/fs/xfs/xfs_zone_alloc.h
index 4db02816d0fd..8b2ef98c81ef 100644
--- a/fs/xfs/xfs_zone_alloc.h
+++ b/fs/xfs/xfs_zone_alloc.h
@@ -51,6 +51,7 @@ int xfs_mount_zones(struct xfs_mount *mp);
 void xfs_unmount_zones(struct xfs_mount *mp);
 void xfs_zone_gc_start(struct xfs_mount *mp);
 void xfs_zone_gc_stop(struct xfs_mount *mp);
+void xfs_zone_gc_wakeup(struct xfs_mount *mp);
 #else
 static inline int xfs_mount_zones(struct xfs_mount *mp)
 {
@@ -65,6 +66,9 @@ static inline void xfs_zone_gc_start(struct xfs_mount *mp)
 static inline void xfs_zone_gc_stop(struct xfs_mount *mp)
 {
 }
+static inline void xfs_zone_gc_wakeup(struct xfs_mount *mp)
+{
+}
 #endif /* CONFIG_XFS_RT */
 
 #endif /* _XFS_ZONE_ALLOC_H */
diff --git a/fs/xfs/xfs_zone_gc.c b/fs/xfs/xfs_zone_gc.c
index b2626a482563..fedcc47048af 100644
--- a/fs/xfs/xfs_zone_gc.c
+++ b/fs/xfs/xfs_zone_gc.c
@@ -125,6 +125,7 @@ struct xfs_zone_gc_iter {
  */
 struct xfs_zone_gc_data {
 	struct xfs_mount		*mp;
+	struct xfs_open_zone		*oz;
 
 	/* bioset used to allocate the gc_bios */
 	struct bio_set			bio_set;
@@ -170,25 +171,37 @@ xfs_zoned_need_gc(
 	s64			available, free, threshold;
 	s32			remainder;
 
+	/* If we have no reclaimable blocks, running GC is useless. */
 	if (!xfs_zoned_have_reclaimable(mp->m_zone_info))
 		return false;
 
+	/*
+	 * In order to avoid file fragmentation as much as possible, we should
+	 * make sure that we can open enough zones. So trigger GC if the number
+	 * of blocks immediately available for writes is lower than the total
+	 * number of blocks from all possible open zones.
+	 */
 	available = xfs_estimate_freecounter(mp, XC_FREE_RTAVAILABLE);
-
 	if (available <
 	    xfs_rtgs_to_rfsbs(mp, mp->m_max_open_zones - XFS_OPEN_GC_ZONES))
 		return true;
 
-	free = xfs_estimate_freecounter(mp, XC_FREE_RTEXTENTS);
+	/*
+	 * For cases where the user wants to be more aggressive with GC,
+	 * the sysfs attribute zonegc_low_space may be set to a non zero value,
+	 * to indicate that GC should try to maintain at least zonegc_low_space
+	 * percent of the free space to be directly available for writing. Check
+	 * this here.
+	 */
+	if (!mp->m_zonegc_low_space)
+		return false;
 
+	free = xfs_estimate_freecounter(mp, XC_FREE_RTEXTENTS);
 	threshold = div_s64_rem(free, 100, &remainder);
 	threshold = threshold * mp->m_zonegc_low_space +
 		    remainder * div_s64(mp->m_zonegc_low_space, 100);
 
-	if (available < threshold)
-		return true;
-
-	return false;
+	return available < threshold;
 }
 
 static struct xfs_zone_gc_data *
@@ -362,7 +375,7 @@ done:
 }
 
 static bool
-xfs_zone_gc_iter_next(
+xfs_zone_gc_iter_irec(
 	struct xfs_mount	*mp,
 	struct xfs_zone_gc_iter	*iter,
 	struct xfs_rmap_irec	*chunk_rec,
@@ -371,9 +384,6 @@ xfs_zone_gc_iter_next(
 	struct xfs_rmap_irec	*irec;
 	int			error;
 
-	if (!iter->victim_rtg)
-		return false;
-
 retry:
 	if (iter->rec_idx == iter->rec_count) {
 		error = xfs_zone_gc_query(mp, iter);
@@ -515,10 +525,11 @@ xfs_zone_gc_select_victim(
 	return true;
 }
 
-static struct xfs_open_zone *
-xfs_zone_gc_steal_open(
-	struct xfs_zone_info	*zi)
+static int
+xfs_zone_gc_steal_open_zone(
+	struct xfs_zone_gc_data	*data)
 {
+	struct xfs_zone_info	*zi = data->mp->m_zone_info;
 	struct xfs_open_zone	*oz, *found = NULL;
 
 	spin_lock(&zi->zi_open_zones_lock);
@@ -526,56 +537,64 @@ xfs_zone_gc_steal_open(
 		if (!found || oz->oz_allocated < found->oz_allocated)
 			found = oz;
 	}
-
-	if (found) {
-		found->oz_is_gc = true;
-		list_del_init(&found->oz_entry);
-		zi->zi_nr_open_zones--;
+	if (!found) {
+		spin_unlock(&zi->zi_open_zones_lock);
+		return -EIO;
 	}
 
+	trace_xfs_zone_gc_target_stolen(found->oz_rtg);
+	found->oz_is_gc = true;
+	zi->zi_nr_open_zones--;
+	zi->zi_nr_open_gc_zones++;
 	spin_unlock(&zi->zi_open_zones_lock);
-	return found;
-}
 
-static struct xfs_open_zone *
-xfs_zone_gc_select_target(
-	struct xfs_mount	*mp)
-{
-	struct xfs_zone_info	*zi = mp->m_zone_info;
-	struct xfs_open_zone	*oz = zi->zi_open_gc_zone;
-
-	/*
-	 * We need to wait for pending writes to finish.
-	 */
-	if (oz && oz->oz_written < rtg_blocks(oz->oz_rtg))
-		return NULL;
-
-	ASSERT(zi->zi_nr_open_zones <=
-		mp->m_max_open_zones - XFS_OPEN_GC_ZONES);
-	oz = xfs_open_zone(mp, WRITE_LIFE_NOT_SET, true);
-	if (oz)
-		trace_xfs_zone_gc_target_opened(oz->oz_rtg);
-	spin_lock(&zi->zi_open_zones_lock);
-	zi->zi_open_gc_zone = oz;
-	spin_unlock(&zi->zi_open_zones_lock);
-	return oz;
+	atomic_inc(&found->oz_ref);
+	data->oz = found;
+	return 0;
 }
 
 /*
- * Ensure we have a valid open zone to write the GC data to.
- *
- * If the current target zone has space keep writing to it, else first wait for
- * all pending writes and then pick a new one.
+ * Ensure we have a valid open zone to write to.
  */
-static struct xfs_open_zone *
-xfs_zone_gc_ensure_target(
-	struct xfs_mount	*mp)
+static bool
+xfs_zone_gc_select_target(
+	struct xfs_zone_gc_data	*data)
 {
-	struct xfs_open_zone	*oz = mp->m_zone_info->zi_open_gc_zone;
+	struct xfs_zone_info	*zi = data->mp->m_zone_info;
 
-	if (!oz || oz->oz_allocated == rtg_blocks(oz->oz_rtg))
-		return xfs_zone_gc_select_target(mp);
-	return oz;
+	if (data->oz) {
+		/*
+		 * If we have space available, just keep using the existing
+		 * zone.
+		 */
+		if (data->oz->oz_allocated < rtg_blocks(data->oz->oz_rtg))
+			return true;
+
+		/*
+		 * Wait for all writes to the current zone to finish before
+		 * picking a new one.
+		 */
+		if (data->oz->oz_written < rtg_blocks(data->oz->oz_rtg))
+			return false;
+
+		xfs_open_zone_put(data->oz);
+	}
+
+	/*
+	 * Open a new zone when there is none currently in use.
+	 */
+	ASSERT(zi->zi_nr_open_zones <=
+		data->mp->m_max_open_zones - XFS_OPEN_GC_ZONES);
+	data->oz = xfs_open_zone(data->mp, WRITE_LIFE_NOT_SET, true);
+	if (!data->oz)
+		return false;
+	trace_xfs_zone_gc_target_opened(data->oz->oz_rtg);
+	atomic_inc(&data->oz->oz_ref);
+	spin_lock(&zi->zi_open_zones_lock);
+	zi->zi_nr_open_gc_zones++;
+	list_add_tail(&data->oz->oz_entry, &zi->zi_open_zones);
+	spin_unlock(&zi->zi_open_zones_lock);
+	return true;
 }
 
 static void
@@ -590,7 +609,7 @@ xfs_zone_gc_end_io(
 	wake_up_process(data->mp->m_zone_info->zi_gc_thread);
 }
 
-static struct xfs_open_zone *
+static bool
 xfs_zone_gc_alloc_blocks(
 	struct xfs_zone_gc_data	*data,
 	xfs_extlen_t		*count_fsb,
@@ -598,11 +617,7 @@ xfs_zone_gc_alloc_blocks(
 	bool			*is_seq)
 {
 	struct xfs_mount	*mp = data->mp;
-	struct xfs_open_zone	*oz;
-
-	oz = xfs_zone_gc_ensure_target(mp);
-	if (!oz)
-		return NULL;
+	struct xfs_open_zone	*oz = data->oz;
 
 	*count_fsb = min(*count_fsb, XFS_B_TO_FSB(mp, data->scratch_available));
 
@@ -624,7 +639,7 @@ xfs_zone_gc_alloc_blocks(
 	spin_unlock(&mp->m_sb_lock);
 
 	if (!*count_fsb)
-		return NULL;
+		return false;
 
 	*daddr = xfs_gbno_to_daddr(rtg_group(oz->oz_rtg), 0);
 	*is_seq = bdev_zone_is_seq(mp->m_rtdev_targp->bt_bdev, *daddr);
@@ -632,7 +647,7 @@ xfs_zone_gc_alloc_blocks(
 		*daddr += XFS_FSB_TO_BB(mp, oz->oz_allocated);
 	oz->oz_allocated += *count_fsb;
 	atomic_inc(&oz->oz_ref);
-	return oz;
+	return true;
 }
 
 static void
@@ -657,6 +672,28 @@ xfs_zone_gc_add_data(
 	} while (len);
 }
 
+static bool
+xfs_zone_gc_can_start_chunk(
+	struct xfs_zone_gc_data	*data)
+{
+
+	if (xfs_is_shutdown(data->mp))
+		return false;
+	if (!data->scratch_available)
+		return false;
+
+	if (!data->iter.victim_rtg) {
+		if (kthread_should_stop() || kthread_should_park())
+			return false;
+		if (!xfs_zoned_need_gc(data->mp))
+			return false;
+		if (!xfs_zone_gc_select_victim(data))
+			return false;
+	}
+
+	return xfs_zone_gc_select_target(data);
+}
+
 static bool
 xfs_zone_gc_start_chunk(
 	struct xfs_zone_gc_data	*data)
@@ -664,7 +701,6 @@ xfs_zone_gc_start_chunk(
 	struct xfs_zone_gc_iter	*iter = &data->iter;
 	struct xfs_mount	*mp = data->mp;
 	struct block_device	*bdev = mp->m_rtdev_targp->bt_bdev;
-	struct xfs_open_zone	*oz;
 	struct xfs_rmap_irec	irec;
 	struct xfs_gc_bio	*chunk;
 	struct xfs_inode	*ip;
@@ -672,14 +708,15 @@ xfs_zone_gc_start_chunk(
 	xfs_daddr_t		daddr;
 	bool			is_seq;
 
-	if (xfs_is_shutdown(mp))
+	if (!xfs_zone_gc_can_start_chunk(data))
 		return false;
 
-	if (!xfs_zone_gc_iter_next(mp, iter, &irec, &ip))
+	set_current_state(TASK_RUNNING);
+	if (!xfs_zone_gc_iter_irec(mp, iter, &irec, &ip))
 		return false;
-	oz = xfs_zone_gc_alloc_blocks(data, &irec.rm_blockcount, &daddr,
-			&is_seq);
-	if (!oz) {
+
+	if (!xfs_zone_gc_alloc_blocks(data, &irec.rm_blockcount, &daddr,
+			&is_seq)) {
 		xfs_irele(ip);
 		return false;
 	}
@@ -699,7 +736,7 @@ xfs_zone_gc_start_chunk(
 	chunk->new_daddr = daddr;
 	chunk->is_seq = is_seq;
 	chunk->data = data;
-	chunk->oz = oz;
+	chunk->oz = data->oz;
 	chunk->victim_rtg = iter->victim_rtg;
 	atomic_inc(&rtg_group(chunk->victim_rtg)->xg_active_ref);
 	atomic_inc(&chunk->victim_rtg->rtg_gccount);
@@ -985,33 +1022,6 @@ xfs_zone_gc_reset_zones(
 	} while (next);
 }
 
-static bool
-xfs_zone_gc_should_start_new_work(
-	struct xfs_zone_gc_data	*data)
-{
-	struct xfs_open_zone	*oz;
-
-	if (xfs_is_shutdown(data->mp))
-		return false;
-	if (!data->scratch_available)
-		return false;
-
-	oz = xfs_zone_gc_ensure_target(data->mp);
-	if (!oz || oz->oz_allocated == rtg_blocks(oz->oz_rtg))
-		return false;
-
-	if (!data->iter.victim_rtg) {
-		if (kthread_should_stop() || kthread_should_park())
-			return false;
-		if (!xfs_zoned_need_gc(data->mp))
-			return false;
-		if (!xfs_zone_gc_select_victim(data))
-			return false;
-	}
-
-	return true;
-}
-
 /*
  * Handle the work to read and write data for GC and to reset the zones,
  * including handling all completions.
@@ -1061,13 +1071,10 @@ xfs_zone_gc_handle_work(
 	}
 	blk_finish_plug(&plug);
 
-	if (xfs_zone_gc_should_start_new_work(data)) {
-		set_current_state(TASK_RUNNING);
-		blk_start_plug(&plug);
-		while (xfs_zone_gc_start_chunk(data))
-			;
-		blk_finish_plug(&plug);
-	}
+	blk_start_plug(&plug);
+	while (xfs_zone_gc_start_chunk(data))
+		;
+	blk_finish_plug(&plug);
 }
 
 /*
@@ -1127,6 +1134,8 @@ xfs_zoned_gcd(
 	}
 	xfs_clear_zonegc_running(mp);
 
+	if (data->oz)
+		xfs_open_zone_put(data->oz);
 	if (data->iter.victim_rtg)
 		xfs_rtgroup_rele(data->iter.victim_rtg);
 
@@ -1151,41 +1160,49 @@ xfs_zone_gc_stop(
 		kthread_park(mp->m_zone_info->zi_gc_thread);
 }
 
+void
+xfs_zone_gc_wakeup(
+	struct xfs_mount	*mp)
+{
+	struct super_block      *sb = mp->m_super;
+
+	/*
+	 * If we are unmounting the file system we must not try to
+	 * wake gc as m_zone_info might have been freed already.
+	 */
+	if (down_read_trylock(&sb->s_umount)) {
+		if (!xfs_is_readonly(mp))
+			wake_up_process(mp->m_zone_info->zi_gc_thread);
+		up_read(&sb->s_umount);
+	}
+}
+
 int
 xfs_zone_gc_mount(
 	struct xfs_mount	*mp)
 {
 	struct xfs_zone_info	*zi = mp->m_zone_info;
 	struct xfs_zone_gc_data	*data;
-	struct xfs_open_zone	*oz;
 	int			error;
 
+	data = xfs_zone_gc_data_alloc(mp);
+	if (!data)
+		return -ENOMEM;
+
 	/*
-	 * If there are no free zones available for GC, pick the open zone with
+	 * If there are no free zones available for GC, or the number of open
+	 * zones has reached the open zone limit, pick the open zone with
 	 * the least used space to GC into.  This should only happen after an
-	 * unclean shutdown near ENOSPC while GC was ongoing.
-	 *
-	 * We also need to do this for the first gc zone allocation if we
-	 * unmounted while at the open limit.
+	 * unclean shutdown while GC was ongoing.  Otherwise a GC zone will
+	 * be selected from the free zone pool on demand.
 	 */
 	if (!xfs_group_marked(mp, XG_TYPE_RTG, XFS_RTG_FREE) ||
-	    zi->zi_nr_open_zones == mp->m_max_open_zones)
-		oz = xfs_zone_gc_steal_open(zi);
-	else
-		oz = xfs_open_zone(mp, WRITE_LIFE_NOT_SET, true);
-	if (!oz) {
-		xfs_warn(mp, "unable to allocate a zone for gc");
-		error = -EIO;
-		goto out;
-	}
-
-	trace_xfs_zone_gc_target_opened(oz->oz_rtg);
-	zi->zi_open_gc_zone = oz;
-
-	data = xfs_zone_gc_data_alloc(mp);
-	if (!data) {
-		error = -ENOMEM;
-		goto out_put_gc_zone;
+	    zi->zi_nr_open_zones >= mp->m_max_open_zones) {
+		error = xfs_zone_gc_steal_open_zone(data);
+		if (error) {
+			xfs_warn(mp, "unable to steal an open zone for gc");
+			goto out_free_gc_data;
+		}
 	}
 
 	zi->zi_gc_thread = kthread_create(xfs_zoned_gcd, data,
@@ -1193,18 +1210,18 @@ xfs_zone_gc_mount(
 	if (IS_ERR(zi->zi_gc_thread)) {
 		xfs_warn(mp, "unable to create zone gc thread");
 		error = PTR_ERR(zi->zi_gc_thread);
-		goto out_free_gc_data;
+		goto out_put_oz;
 	}
 
 	/* xfs_zone_gc_start will unpark for rw mounts */
 	kthread_park(zi->zi_gc_thread);
 	return 0;
 
+out_put_oz:
+	if (data->oz)
+		xfs_open_zone_put(data->oz);
 out_free_gc_data:
 	kfree(data);
-out_put_gc_zone:
-	xfs_open_zone_put(zi->zi_open_gc_zone);
-out:
 	return error;
 }
 
@@ -1215,6 +1232,4 @@ xfs_zone_gc_unmount(
 	struct xfs_zone_info	*zi = mp->m_zone_info;
 
 	kthread_stop(zi->zi_gc_thread);
-	if (zi->zi_open_gc_zone)
-		xfs_open_zone_put(zi->zi_open_gc_zone);
 }
diff --git a/fs/xfs/xfs_zone_info.c b/fs/xfs/xfs_zone_info.c
index 53eabbc3334c..47b475e21af8 100644
--- a/fs/xfs/xfs_zone_info.c
+++ b/fs/xfs/xfs_zone_info.c
@@ -30,11 +30,12 @@ xfs_show_open_zone(
 	struct seq_file		*m,
 	struct xfs_open_zone	*oz)
 {
-	seq_printf(m, "\t  zone %d, wp %u, written %u, used %u, hint %s\n",
+	seq_printf(m, "\t  zone %d, wp %u, written %u, used %u, hint %s %s\n",
 		rtg_rgno(oz->oz_rtg),
 		oz->oz_allocated, oz->oz_written,
 		rtg_rmap(oz->oz_rtg)->i_used_blocks,
-		xfs_write_hint_to_str(oz->oz_write_hint));
+		xfs_write_hint_to_str(oz->oz_write_hint),
+		oz->oz_is_gc ? "(GC)" : "");
 }
 
 static void
@@ -58,9 +59,8 @@ xfs_show_full_zone_used_distribution(
 	spin_unlock(&zi->zi_used_buckets_lock);
 
 	full = mp->m_sb.sb_rgcount;
-	if (zi->zi_open_gc_zone)
-		full--;
 	full -= zi->zi_nr_open_zones;
+	full -= zi->zi_nr_open_gc_zones;
 	full -= atomic_read(&zi->zi_nr_free_zones);
 	full -= reclaimable;
 
@@ -90,15 +90,20 @@ xfs_zoned_show_stats(
 	seq_printf(m, "\tRT GC required: %d\n",
 		xfs_zoned_need_gc(mp));
 
+	seq_printf(m, "\ttotal number of zones: %u\n",
+		mp->m_sb.sb_rgcount);
 	seq_printf(m, "\tfree zones: %d\n", atomic_read(&zi->zi_nr_free_zones));
-	seq_puts(m, "\topen zones:\n");
+
 	spin_lock(&zi->zi_open_zones_lock);
+	seq_printf(m, "\tmax open zones: %u\n",
+		mp->m_max_open_zones);
+	seq_printf(m, "\tnr open zones: %u\n",
+		zi->zi_nr_open_zones);
+	seq_printf(m, "\tnr open GC zones: %u\n",
+		zi->zi_nr_open_gc_zones);
+	seq_puts(m, "\topen zones:\n");
 	list_for_each_entry(oz, &zi->zi_open_zones, oz_entry)
 		xfs_show_open_zone(m, oz);
-	if (zi->zi_open_gc_zone) {
-		seq_puts(m, "\topen gc zone:\n");
-		xfs_show_open_zone(m, zi->zi_open_gc_zone);
-	}
 	spin_unlock(&zi->zi_open_zones_lock);
 	seq_puts(m, "\tused blocks distribution (fully written zones):\n");
 	xfs_show_full_zone_used_distribution(m, mp);
diff --git a/fs/xfs/xfs_zone_priv.h b/fs/xfs/xfs_zone_priv.h
index 8fbf9a52964e..fcb57506d8e6 100644
--- a/fs/xfs/xfs_zone_priv.h
+++ b/fs/xfs/xfs_zone_priv.h
@@ -32,11 +32,7 @@ struct xfs_open_zone {
 	 */
 	enum rw_hint		oz_write_hint;
 
-	/*
-	 * Is this open zone used for garbage collection?  There can only be a
-	 * single open GC zone, which is pointed to by zi_open_gc_zone in
-	 * struct xfs_zone_info.  Constant over the life time of an open zone.
-	 */
+	/* Is this open zone used for garbage collection? */
 	bool			oz_is_gc;
 
 	/*
@@ -68,6 +64,7 @@ struct xfs_zone_info {
 	spinlock_t		zi_open_zones_lock;
 	struct list_head	zi_open_zones;
 	unsigned int		zi_nr_open_zones;
+	unsigned int		zi_nr_open_gc_zones;
 
 	/*
 	 * Free zone search cursor and number of free zones:
@@ -81,15 +78,9 @@ struct xfs_zone_info {
 	wait_queue_head_t	zi_zone_wait;
 
 	/*
-	 * Pointer to the GC thread, and the current open zone used by GC
-	 * (if any).
-	 *
-	 * zi_open_gc_zone is mostly private to the GC thread, but can be read
-	 * for debugging from other threads, in which case zi_open_zones_lock
-	 * must be taken to access it.
+	 * Pointer to the GC thread.
 	 */
 	struct task_struct      *zi_gc_thread;
-	struct xfs_open_zone	*zi_open_gc_zone;
 
 	/*
 	 * List of zones that need a reset: