diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 57de3f4bb2c74117fa93401d4d0af838ca56b721..d73444528d9bcf14311d49f9bbbcc59a7d1c8211 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -28,6 +28,7 @@ xfs-y				+= xfs_trace.o
 
 # build the libxfs code first
 xfs-y				+= $(addprefix libxfs/, \
+				   xfs_ag.o \
 				   xfs_alloc.o \
 				   xfs_alloc_btree.o \
 				   xfs_attr.o \
diff --git a/fs/xfs/libxfs/xfs_ag.c b/fs/xfs/libxfs/xfs_ag.c
new file mode 100644
index 0000000000000000000000000000000000000000..5baa22c07095727fb086c6beaa8e35a777448ffc
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_ag.c
@@ -0,0 +1,404 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * Copyright (c) 2018 Red Hat, Inc.
+ * All rights reserved.
+ */
+
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_sb.h"
+#include "xfs_mount.h"
+#include "xfs_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_rmap_btree.h"
+#include "xfs_alloc.h"
+#include "xfs_rmap.h"
+#include "xfs_ag.h"
+
+static struct xfs_buf *
+xfs_get_aghdr_buf(
+	struct xfs_mount	*mp,
+	xfs_daddr_t		blkno,
+	size_t			numblks,
+	int			flags,
+	const struct xfs_buf_ops *ops)
+{
+	struct xfs_buf		*bp;
+
+	bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
+	if (!bp)
+		return NULL;
+
+	xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
+	bp->b_bn = blkno;
+	bp->b_maps[0].bm_bn = blkno;
+	bp->b_ops = ops;
+
+	return bp;
+}
+
+/*
+ * Generic btree root block init function
+ */
+static void
+xfs_btroot_init(
+	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
+	struct aghdr_init_data	*id)
+{
+	xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno, 0);
+}
+
+/*
+ * Alloc btree root block init functions
+ */
+static void
+xfs_bnoroot_init(
+	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
+	struct aghdr_init_data	*id)
+{
+	struct xfs_alloc_rec	*arec;
+
+	xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno, 0);
+	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
+	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
+	arec->ar_blockcount = cpu_to_be32(id->agsize -
+					  be32_to_cpu(arec->ar_startblock));
+}
+
+static void
+xfs_cntroot_init(
+	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
+	struct aghdr_init_data	*id)
+{
+	struct xfs_alloc_rec	*arec;
+
+	xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno, 0);
+	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
+	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
+	arec->ar_blockcount = cpu_to_be32(id->agsize -
+					  be32_to_cpu(arec->ar_startblock));
+}
+
+/*
+ * Reverse map root block init
+ */
+static void
+xfs_rmaproot_init(
+	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
+	struct aghdr_init_data	*id)
+{
+	struct xfs_btree_block	*block = XFS_BUF_TO_BLOCK(bp);
+	struct xfs_rmap_rec	*rrec;
+
+	xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno, 0);
+
+	/*
+	 * mark the AG header regions as static metadata The BNO
+	 * btree block is the first block after the headers, so
+	 * it's location defines the size of region the static
+	 * metadata consumes.
+	 *
+	 * Note: unlike mkfs, we never have to account for log
+	 * space when growing the data regions
+	 */
+	rrec = XFS_RMAP_REC_ADDR(block, 1);
+	rrec->rm_startblock = 0;
+	rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
+	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
+	rrec->rm_offset = 0;
+
+	/* account freespace btree root blocks */
+	rrec = XFS_RMAP_REC_ADDR(block, 2);
+	rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
+	rrec->rm_blockcount = cpu_to_be32(2);
+	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
+	rrec->rm_offset = 0;
+
+	/* account inode btree root blocks */
+	rrec = XFS_RMAP_REC_ADDR(block, 3);
+	rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
+	rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
+					  XFS_IBT_BLOCK(mp));
+	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
+	rrec->rm_offset = 0;
+
+	/* account for rmap btree root */
+	rrec = XFS_RMAP_REC_ADDR(block, 4);
+	rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
+	rrec->rm_blockcount = cpu_to_be32(1);
+	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
+	rrec->rm_offset = 0;
+
+	/* account for refc btree root */
+	if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+		rrec = XFS_RMAP_REC_ADDR(block, 5);
+		rrec->rm_startblock = cpu_to_be32(xfs_refc_block(mp));
+		rrec->rm_blockcount = cpu_to_be32(1);
+		rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
+		rrec->rm_offset = 0;
+		be16_add_cpu(&block->bb_numrecs, 1);
+	}
+}
+
+/*
+ * Initialise new secondary superblocks with the pre-grow geometry, but mark
+ * them as "in progress" so we know they haven't yet been activated. This will
+ * get cleared when the update with the new geometry information is done after
+ * changes to the primary are committed. This isn't strictly necessary, but we
+ * get it for free with the delayed buffer write lists and it means we can tell
+ * if a grow operation didn't complete properly after the fact.
+ */
+static void
+xfs_sbblock_init(
+	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
+	struct aghdr_init_data	*id)
+{
+	struct xfs_dsb		*dsb = XFS_BUF_TO_SBP(bp);
+
+	xfs_sb_to_disk(dsb, &mp->m_sb);
+	dsb->sb_inprogress = 1;
+}
+
+static void
+xfs_agfblock_init(
+	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
+	struct aghdr_init_data	*id)
+{
+	struct xfs_agf		*agf = XFS_BUF_TO_AGF(bp);
+	xfs_extlen_t		tmpsize;
+
+	agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
+	agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
+	agf->agf_seqno = cpu_to_be32(id->agno);
+	agf->agf_length = cpu_to_be32(id->agsize);
+	agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
+	agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
+	agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
+	agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
+	if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
+		agf->agf_roots[XFS_BTNUM_RMAPi] =
+					cpu_to_be32(XFS_RMAP_BLOCK(mp));
+		agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
+		agf->agf_rmap_blocks = cpu_to_be32(1);
+	}
+
+	agf->agf_flfirst = cpu_to_be32(1);
+	agf->agf_fllast = 0;
+	agf->agf_flcount = 0;
+	tmpsize = id->agsize - mp->m_ag_prealloc_blocks;
+	agf->agf_freeblks = cpu_to_be32(tmpsize);
+	agf->agf_longest = cpu_to_be32(tmpsize);
+	if (xfs_sb_version_hascrc(&mp->m_sb))
+		uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
+	if (xfs_sb_version_hasreflink(&mp->m_sb)) {
+		agf->agf_refcount_root = cpu_to_be32(
+				xfs_refc_block(mp));
+		agf->agf_refcount_level = cpu_to_be32(1);
+		agf->agf_refcount_blocks = cpu_to_be32(1);
+	}
+}
+
+static void
+xfs_agflblock_init(
+	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
+	struct aghdr_init_data	*id)
+{
+	struct xfs_agfl		*agfl = XFS_BUF_TO_AGFL(bp);
+	__be32			*agfl_bno;
+	int			bucket;
+
+	if (xfs_sb_version_hascrc(&mp->m_sb)) {
+		agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
+		agfl->agfl_seqno = cpu_to_be32(id->agno);
+		uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
+	}
+
+	agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
+	for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++)
+		agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
+}
+
+static void
+xfs_agiblock_init(
+	struct xfs_mount	*mp,
+	struct xfs_buf		*bp,
+	struct aghdr_init_data	*id)
+{
+	struct xfs_agi		*agi = XFS_BUF_TO_AGI(bp);
+	int			bucket;
+
+	agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
+	agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
+	agi->agi_seqno = cpu_to_be32(id->agno);
+	agi->agi_length = cpu_to_be32(id->agsize);
+	agi->agi_count = 0;
+	agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
+	agi->agi_level = cpu_to_be32(1);
+	agi->agi_freecount = 0;
+	agi->agi_newino = cpu_to_be32(NULLAGINO);
+	agi->agi_dirino = cpu_to_be32(NULLAGINO);
+	if (xfs_sb_version_hascrc(&mp->m_sb))
+		uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
+	if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
+		agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
+		agi->agi_free_level = cpu_to_be32(1);
+	}
+	for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
+		agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
+}
+
+typedef void (*aghdr_init_work_f)(struct xfs_mount *mp, struct xfs_buf *bp,
+				  struct aghdr_init_data *id);
+static int
+xfs_ag_init_hdr(
+	struct xfs_mount	*mp,
+	struct aghdr_init_data	*id,
+	aghdr_init_work_f	work,
+	const struct xfs_buf_ops *ops)
+
+{
+	struct xfs_buf		*bp;
+
+	bp = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, 0, ops);
+	if (!bp)
+		return -ENOMEM;
+
+	(*work)(mp, bp, id);
+
+	xfs_buf_delwri_queue(bp, &id->buffer_list);
+	xfs_buf_relse(bp);
+	return 0;
+}
+
+struct xfs_aghdr_grow_data {
+	xfs_daddr_t		daddr;
+	size_t			numblks;
+	const struct xfs_buf_ops *ops;
+	aghdr_init_work_f	work;
+	xfs_btnum_t		type;
+	bool			need_init;
+};
+
+/*
+ * Prepare new AG headers to be written to disk. We use uncached buffers here,
+ * as it is assumed these new AG headers are currently beyond the currently
+ * valid filesystem address space. Using cached buffers would trip over EOFS
+ * corruption detection alogrithms in the buffer cache lookup routines.
+ *
+ * This is a non-transactional function, but the prepared buffers are added to a
+ * delayed write buffer list supplied by the caller so they can submit them to
+ * disk and wait on them as required.
+ */
+int
+xfs_ag_init_headers(
+	struct xfs_mount	*mp,
+	struct aghdr_init_data	*id)
+
+{
+	struct xfs_aghdr_grow_data aghdr_data[] = {
+	{ /* SB */
+		.daddr = XFS_AG_DADDR(mp, id->agno, XFS_SB_DADDR),
+		.numblks = XFS_FSS_TO_BB(mp, 1),
+		.ops = &xfs_sb_buf_ops,
+		.work = &xfs_sbblock_init,
+		.need_init = true
+	},
+	{ /* AGF */
+		.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGF_DADDR(mp)),
+		.numblks = XFS_FSS_TO_BB(mp, 1),
+		.ops = &xfs_agf_buf_ops,
+		.work = &xfs_agfblock_init,
+		.need_init = true
+	},
+	{ /* AGFL */
+		.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGFL_DADDR(mp)),
+		.numblks = XFS_FSS_TO_BB(mp, 1),
+		.ops = &xfs_agfl_buf_ops,
+		.work = &xfs_agflblock_init,
+		.need_init = true
+	},
+	{ /* AGI */
+		.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGI_DADDR(mp)),
+		.numblks = XFS_FSS_TO_BB(mp, 1),
+		.ops = &xfs_agi_buf_ops,
+		.work = &xfs_agiblock_init,
+		.need_init = true
+	},
+	{ /* BNO root block */
+		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)),
+		.numblks = BTOBB(mp->m_sb.sb_blocksize),
+		.ops = &xfs_allocbt_buf_ops,
+		.work = &xfs_bnoroot_init,
+		.need_init = true
+	},
+	{ /* CNT root block */
+		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)),
+		.numblks = BTOBB(mp->m_sb.sb_blocksize),
+		.ops = &xfs_allocbt_buf_ops,
+		.work = &xfs_cntroot_init,
+		.need_init = true
+	},
+	{ /* INO root block */
+		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_IBT_BLOCK(mp)),
+		.numblks = BTOBB(mp->m_sb.sb_blocksize),
+		.ops = &xfs_inobt_buf_ops,
+		.work = &xfs_btroot_init,
+		.type = XFS_BTNUM_INO,
+		.need_init = true
+	},
+	{ /* FINO root block */
+		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)),
+		.numblks = BTOBB(mp->m_sb.sb_blocksize),
+		.ops = &xfs_inobt_buf_ops,
+		.work = &xfs_btroot_init,
+		.type = XFS_BTNUM_FINO,
+		.need_init =  xfs_sb_version_hasfinobt(&mp->m_sb)
+	},
+	{ /* RMAP root block */
+		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_RMAP_BLOCK(mp)),
+		.numblks = BTOBB(mp->m_sb.sb_blocksize),
+		.ops = &xfs_rmapbt_buf_ops,
+		.work = &xfs_rmaproot_init,
+		.need_init = xfs_sb_version_hasrmapbt(&mp->m_sb)
+	},
+	{ /* REFC root block */
+		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, xfs_refc_block(mp)),
+		.numblks = BTOBB(mp->m_sb.sb_blocksize),
+		.ops = &xfs_refcountbt_buf_ops,
+		.work = &xfs_btroot_init,
+		.type = XFS_BTNUM_REFC,
+		.need_init = xfs_sb_version_hasreflink(&mp->m_sb)
+	},
+	{ /* NULL terminating block */
+		.daddr = XFS_BUF_DADDR_NULL,
+	}
+	};
+	struct  xfs_aghdr_grow_data *dp;
+	int			error = 0;
+
+	/* Account for AG free space in new AG */
+	id->nfree += id->agsize - mp->m_ag_prealloc_blocks;
+	for (dp = &aghdr_data[0]; dp->daddr != XFS_BUF_DADDR_NULL; dp++) {
+		if (!dp->need_init)
+			continue;
+
+		id->daddr = dp->daddr;
+		id->numblks = dp->numblks;
+		id->type = dp->type;
+		error = xfs_ag_init_hdr(mp, id, dp->work, dp->ops);
+		if (error)
+			break;
+	}
+	return error;
+}
diff --git a/fs/xfs/libxfs/xfs_ag.h b/fs/xfs/libxfs/xfs_ag.h
new file mode 100644
index 0000000000000000000000000000000000000000..69f2fd4be0eadb32b5ce6f3935db67b715446180
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_ag.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2018 Red Hat, Inc.
+ * All rights reserved.
+ */
+
+#ifndef __LIBXFS_AG_H
+#define __LIBXFS_AG_H 1
+
+struct aghdr_init_data {
+	/* per ag data */
+	xfs_agblock_t		agno;		/* ag to init */
+	xfs_extlen_t		agsize;		/* new AG size */
+	struct list_head	buffer_list;	/* buffer writeback list */
+	xfs_rfsblock_t		nfree;		/* cumulative new free space */
+
+	/* per header data */
+	xfs_daddr_t		daddr;		/* header location */
+	size_t			numblks;	/* size of header */
+	xfs_btnum_t		type;		/* type of btree root block */
+};
+
+int xfs_ag_init_headers( struct xfs_mount *mp, struct aghdr_init_data *id);
+
+#endif /* __LIBXFS_AG_H */
diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index d9bef41a3f26a1d43759ceb09847f92ab29afa0b..a35344ae495179fb03a0e77721f33110c69e4706 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -888,6 +888,79 @@ xfs_sync_sb(
 	return xfs_trans_commit(tp);
 }
 
+/*
+ * Update all the secondary superblocks to match the new state of the primary.
+ * Because we are completely overwriting all the existing fields in the
+ * secondary superblock buffers, there is no need to read them in from disk.
+ * Just get a new buffer, stamp it and write it.
+ *
+ * The sb buffers need to be cached here so that we serialise against other
+ * operations that access the secondary superblocks, but we don't want to keep
+ * them in memory once it is written so we mark it as a one-shot buffer.
+ */
+int
+xfs_update_secondary_sbs(
+	struct xfs_mount	*mp)
+{
+	xfs_agnumber_t		agno;
+	int			saved_error = 0;
+	int			error = 0;
+	LIST_HEAD		(buffer_list);
+
+	/* update secondary superblocks. */
+	for (agno = 1; agno < mp->m_sb.sb_agcount; agno++) {
+		struct xfs_buf		*bp;
+
+		bp = xfs_buf_get(mp->m_ddev_targp,
+				 XFS_AG_DADDR(mp, agno, XFS_SB_DADDR),
+				 XFS_FSS_TO_BB(mp, 1), 0);
+		/*
+		 * If we get an error reading or writing alternate superblocks,
+		 * continue.  xfs_repair chooses the "best" superblock based
+		 * on most matches; if we break early, we'll leave more
+		 * superblocks un-updated than updated, and xfs_repair may
+		 * pick them over the properly-updated primary.
+		 */
+		if (!bp) {
+			xfs_warn(mp,
+		"error allocating secondary superblock for ag %d",
+				agno);
+			if (!saved_error)
+				saved_error = -ENOMEM;
+			continue;
+		}
+
+		bp->b_ops = &xfs_sb_buf_ops;
+		xfs_buf_oneshot(bp);
+		xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
+		xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
+		xfs_buf_delwri_queue(bp, &buffer_list);
+		xfs_buf_relse(bp);
+
+		/* don't hold too many buffers at once */
+		if (agno % 16)
+			continue;
+
+		error = xfs_buf_delwri_submit(&buffer_list);
+		if (error) {
+			xfs_warn(mp,
+		"write error %d updating a secondary superblock near ag %d",
+				error, agno);
+			if (!saved_error)
+				saved_error = error;
+			continue;
+		}
+	}
+	error = xfs_buf_delwri_submit(&buffer_list);
+	if (error) {
+		xfs_warn(mp,
+		"write error %d updating a secondary superblock near ag %d",
+			error, agno);
+	}
+
+	return saved_error ? saved_error : error;
+}
+
 int
 xfs_fs_geometry(
 	struct xfs_sb		*sbp,
diff --git a/fs/xfs/libxfs/xfs_sb.h b/fs/xfs/libxfs/xfs_sb.h
index 5166d78b2c342352afd3e46894ec221e35dc8201..fc65d4e1433a7f450a16c4aecf469cc3dc34d911 100644
--- a/fs/xfs/libxfs/xfs_sb.h
+++ b/fs/xfs/libxfs/xfs_sb.h
@@ -18,6 +18,13 @@
 #ifndef __XFS_SB_H__
 #define	__XFS_SB_H__
 
+struct xfs_mount;
+struct xfs_sb;
+struct xfs_dsb;
+struct xfs_trans;
+struct xfs_fsop_geom;
+struct xfs_perag;
+
 /*
  * perag get/put wrappers for ref counting
  */
@@ -34,6 +41,8 @@ extern void	xfs_sb_from_disk(struct xfs_sb *to, struct xfs_dsb *from);
 extern void	xfs_sb_to_disk(struct xfs_dsb *to, struct xfs_sb *from);
 extern void	xfs_sb_quota_from_disk(struct xfs_sb *sbp);
 
+extern int	xfs_update_secondary_sbs(struct xfs_mount *mp);
+
 #define XFS_FS_GEOM_MAX_STRUCT_VER	(4)
 extern int	xfs_fs_geometry(struct xfs_sb *sbp, struct xfs_fsop_geom *geo,
 				int struct_version);
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index ca3cf3f6239a579cf8f838bbe8dda65255ca6c30..c5087b79bcea20755b80c39777fe91e0a1f36a95 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -24,11 +24,7 @@
 #include "xfs_sb.h"
 #include "xfs_mount.h"
 #include "xfs_defer.h"
-#include "xfs_da_format.h"
-#include "xfs_da_btree.h"
-#include "xfs_inode.h"
 #include "xfs_trans.h"
-#include "xfs_inode_item.h"
 #include "xfs_error.h"
 #include "xfs_btree.h"
 #include "xfs_alloc_btree.h"
@@ -36,411 +32,17 @@
 #include "xfs_rmap_btree.h"
 #include "xfs_ialloc.h"
 #include "xfs_fsops.h"
-#include "xfs_itable.h"
 #include "xfs_trans_space.h"
 #include "xfs_rtalloc.h"
 #include "xfs_trace.h"
 #include "xfs_log.h"
-#include "xfs_filestream.h"
 #include "xfs_rmap.h"
+#include "xfs_ag.h"
 #include "xfs_ag_resv.h"
 
 /*
- * File system operations
- */
-
-static struct xfs_buf *
-xfs_growfs_get_hdr_buf(
-	struct xfs_mount	*mp,
-	xfs_daddr_t		blkno,
-	size_t			numblks,
-	int			flags,
-	const struct xfs_buf_ops *ops)
-{
-	struct xfs_buf		*bp;
-
-	bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
-	if (!bp)
-		return NULL;
-
-	xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
-	bp->b_bn = blkno;
-	bp->b_maps[0].bm_bn = blkno;
-	bp->b_ops = ops;
-
-	return bp;
-}
-
-struct aghdr_init_data {
-	/* per ag data */
-	xfs_agnumber_t		agno;		/* ag to init */
-	xfs_extlen_t		agsize;		/* new AG size */
-	struct list_head	buffer_list;	/* buffer writeback list */
-	xfs_rfsblock_t		nfree;		/* cumulative new free space */
-
-	/* per header data */
-	xfs_daddr_t		daddr;		/* header location */
-	size_t			numblks;	/* size of header */
-	xfs_btnum_t		type;		/* type of btree root block */
-};
-
-/*
- * Generic btree root block init function
- */
-static void
-xfs_btroot_init(
-	struct xfs_mount	*mp,
-	struct xfs_buf		*bp,
-	struct aghdr_init_data	*id)
-{
-	xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno, 0);
-}
-
-/*
- * Alloc btree root block init functions
- */
-static void
-xfs_bnoroot_init(
-	struct xfs_mount	*mp,
-	struct xfs_buf		*bp,
-	struct aghdr_init_data	*id)
-{
-	struct xfs_alloc_rec	*arec;
-
-	xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno, 0);
-	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
-	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
-	arec->ar_blockcount = cpu_to_be32(id->agsize -
-					  be32_to_cpu(arec->ar_startblock));
-}
-
-static void
-xfs_cntroot_init(
-	struct xfs_mount	*mp,
-	struct xfs_buf		*bp,
-	struct aghdr_init_data	*id)
-{
-	struct xfs_alloc_rec	*arec;
-
-	xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno, 0);
-	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
-	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
-	arec->ar_blockcount = cpu_to_be32(id->agsize -
-					  be32_to_cpu(arec->ar_startblock));
-}
-
-/*
- * Reverse map root block init
- */
-static void
-xfs_rmaproot_init(
-	struct xfs_mount	*mp,
-	struct xfs_buf		*bp,
-	struct aghdr_init_data	*id)
-{
-	struct xfs_btree_block	*block = XFS_BUF_TO_BLOCK(bp);
-	struct xfs_rmap_rec	*rrec;
-
-	xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno, 0);
-
-	/*
-	 * mark the AG header regions as static metadata The BNO
-	 * btree block is the first block after the headers, so
-	 * it's location defines the size of region the static
-	 * metadata consumes.
-	 *
-	 * Note: unlike mkfs, we never have to account for log
-	 * space when growing the data regions
-	 */
-	rrec = XFS_RMAP_REC_ADDR(block, 1);
-	rrec->rm_startblock = 0;
-	rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
-	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
-	rrec->rm_offset = 0;
-
-	/* account freespace btree root blocks */
-	rrec = XFS_RMAP_REC_ADDR(block, 2);
-	rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
-	rrec->rm_blockcount = cpu_to_be32(2);
-	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
-	rrec->rm_offset = 0;
-
-	/* account inode btree root blocks */
-	rrec = XFS_RMAP_REC_ADDR(block, 3);
-	rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
-	rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
-					  XFS_IBT_BLOCK(mp));
-	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
-	rrec->rm_offset = 0;
-
-	/* account for rmap btree root */
-	rrec = XFS_RMAP_REC_ADDR(block, 4);
-	rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
-	rrec->rm_blockcount = cpu_to_be32(1);
-	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
-	rrec->rm_offset = 0;
-
-	/* account for refc btree root */
-	if (xfs_sb_version_hasreflink(&mp->m_sb)) {
-		rrec = XFS_RMAP_REC_ADDR(block, 5);
-		rrec->rm_startblock = cpu_to_be32(xfs_refc_block(mp));
-		rrec->rm_blockcount = cpu_to_be32(1);
-		rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
-		rrec->rm_offset = 0;
-		be16_add_cpu(&block->bb_numrecs, 1);
-	}
-}
-
-/*
- * Initialise new secondary superblocks with the pre-grow geometry, but mark
- * them as "in progress" so we know they haven't yet been activated. This will
- * get cleared when the update with the new geometry information is done after
- * changes to the primary are committed. This isn't strictly necessary, but we
- * get it for free with the delayed buffer write lists and it means we can tell
- * if a grow operation didn't complete properly after the fact.
- */
-static void
-xfs_sbblock_init(
-	struct xfs_mount	*mp,
-	struct xfs_buf		*bp,
-	struct aghdr_init_data	*id)
-{
-	struct xfs_dsb		*dsb = XFS_BUF_TO_SBP(bp);
-
-	xfs_sb_to_disk(dsb, &mp->m_sb);
-	dsb->sb_inprogress = 1;
-}
-
-static void
-xfs_agfblock_init(
-	struct xfs_mount	*mp,
-	struct xfs_buf		*bp,
-	struct aghdr_init_data	*id)
-{
-	struct xfs_agf		*agf = XFS_BUF_TO_AGF(bp);
-	xfs_extlen_t		tmpsize;
-
-	agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
-	agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
-	agf->agf_seqno = cpu_to_be32(id->agno);
-	agf->agf_length = cpu_to_be32(id->agsize);
-	agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
-	agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
-	agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
-	agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
-	if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
-		agf->agf_roots[XFS_BTNUM_RMAPi] =
-					cpu_to_be32(XFS_RMAP_BLOCK(mp));
-		agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
-		agf->agf_rmap_blocks = cpu_to_be32(1);
-	}
-
-	agf->agf_flfirst = cpu_to_be32(1);
-	agf->agf_fllast = 0;
-	agf->agf_flcount = 0;
-	tmpsize = id->agsize - mp->m_ag_prealloc_blocks;
-	agf->agf_freeblks = cpu_to_be32(tmpsize);
-	agf->agf_longest = cpu_to_be32(tmpsize);
-	if (xfs_sb_version_hascrc(&mp->m_sb))
-		uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
-	if (xfs_sb_version_hasreflink(&mp->m_sb)) {
-		agf->agf_refcount_root = cpu_to_be32(
-				xfs_refc_block(mp));
-		agf->agf_refcount_level = cpu_to_be32(1);
-		agf->agf_refcount_blocks = cpu_to_be32(1);
-	}
-}
-
-static void
-xfs_agflblock_init(
-	struct xfs_mount	*mp,
-	struct xfs_buf		*bp,
-	struct aghdr_init_data	*id)
-{
-	struct xfs_agfl		*agfl = XFS_BUF_TO_AGFL(bp);
-	__be32			*agfl_bno;
-	int			bucket;
-
-	if (xfs_sb_version_hascrc(&mp->m_sb)) {
-		agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
-		agfl->agfl_seqno = cpu_to_be32(id->agno);
-		uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
-	}
-
-	agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
-	for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++)
-		agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
-}
-
-static void
-xfs_agiblock_init(
-	struct xfs_mount	*mp,
-	struct xfs_buf		*bp,
-	struct aghdr_init_data	*id)
-{
-	struct xfs_agi		*agi = XFS_BUF_TO_AGI(bp);
-	int			bucket;
-
-	agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
-	agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
-	agi->agi_seqno = cpu_to_be32(id->agno);
-	agi->agi_length = cpu_to_be32(id->agsize);
-	agi->agi_count = 0;
-	agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
-	agi->agi_level = cpu_to_be32(1);
-	agi->agi_freecount = 0;
-	agi->agi_newino = cpu_to_be32(NULLAGINO);
-	agi->agi_dirino = cpu_to_be32(NULLAGINO);
-	if (xfs_sb_version_hascrc(&mp->m_sb))
-		uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
-	if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
-		agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
-		agi->agi_free_level = cpu_to_be32(1);
-	}
-	for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
-		agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
-}
-
-typedef void (*aghdr_init_work_f)(struct xfs_mount *mp, struct xfs_buf *bp,
-				  struct aghdr_init_data *id);
-static int
-xfs_growfs_init_aghdr(
-	struct xfs_mount	*mp,
-	struct aghdr_init_data	*id,
-	aghdr_init_work_f	work,
-	const struct xfs_buf_ops *ops)
-
-{
-	struct xfs_buf		*bp;
-
-	bp = xfs_growfs_get_hdr_buf(mp, id->daddr, id->numblks, 0, ops);
-	if (!bp)
-		return -ENOMEM;
-
-	(*work)(mp, bp, id);
-
-	xfs_buf_delwri_queue(bp, &id->buffer_list);
-	xfs_buf_relse(bp);
-	return 0;
-}
-
-struct xfs_aghdr_grow_data {
-	xfs_daddr_t		daddr;
-	size_t			numblks;
-	const struct xfs_buf_ops *ops;
-	aghdr_init_work_f	work;
-	xfs_btnum_t		type;
-	bool			need_init;
-};
-
-/*
- * Write new AG headers to disk. Non-transactional, but written
- * synchronously so they are completed prior to the growfs transaction
- * being logged.
+ * growfs operations
  */
-static int
-xfs_grow_ag_headers(
-	struct xfs_mount	*mp,
-	struct aghdr_init_data	*id)
-
-{
-	struct xfs_aghdr_grow_data aghdr_data[] = {
-	{ /* SB */
-		.daddr = XFS_AG_DADDR(mp, id->agno, XFS_SB_DADDR),
-		.numblks = XFS_FSS_TO_BB(mp, 1),
-		.ops = &xfs_sb_buf_ops,
-		.work = &xfs_sbblock_init,
-		.need_init = true
-	},
-	{ /* AGF */
-		.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGF_DADDR(mp)),
-		.numblks = XFS_FSS_TO_BB(mp, 1),
-		.ops = &xfs_agf_buf_ops,
-		.work = &xfs_agfblock_init,
-		.need_init = true
-	},
-	{ /* AGFL */
-		.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGFL_DADDR(mp)),
-		.numblks = XFS_FSS_TO_BB(mp, 1),
-		.ops = &xfs_agfl_buf_ops,
-		.work = &xfs_agflblock_init,
-		.need_init = true
-	},
-	{ /* AGI */
-		.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGI_DADDR(mp)),
-		.numblks = XFS_FSS_TO_BB(mp, 1),
-		.ops = &xfs_agi_buf_ops,
-		.work = &xfs_agiblock_init,
-		.need_init = true
-	},
-	{ /* BNO root block */
-		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)),
-		.numblks = BTOBB(mp->m_sb.sb_blocksize),
-		.ops = &xfs_allocbt_buf_ops,
-		.work = &xfs_bnoroot_init,
-		.need_init = true
-	},
-	{ /* CNT root block */
-		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)),
-		.numblks = BTOBB(mp->m_sb.sb_blocksize),
-		.ops = &xfs_allocbt_buf_ops,
-		.work = &xfs_cntroot_init,
-		.need_init = true
-	},
-	{ /* INO root block */
-		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_IBT_BLOCK(mp)),
-		.numblks = BTOBB(mp->m_sb.sb_blocksize),
-		.ops = &xfs_inobt_buf_ops,
-		.work = &xfs_btroot_init,
-		.type = XFS_BTNUM_INO,
-		.need_init = true
-	},
-	{ /* FINO root block */
-		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)),
-		.numblks = BTOBB(mp->m_sb.sb_blocksize),
-		.ops = &xfs_inobt_buf_ops,
-		.work = &xfs_btroot_init,
-		.type = XFS_BTNUM_FINO,
-		.need_init =  xfs_sb_version_hasfinobt(&mp->m_sb)
-	},
-	{ /* RMAP root block */
-		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_RMAP_BLOCK(mp)),
-		.numblks = BTOBB(mp->m_sb.sb_blocksize),
-		.ops = &xfs_rmapbt_buf_ops,
-		.work = &xfs_rmaproot_init,
-		.need_init = xfs_sb_version_hasrmapbt(&mp->m_sb)
-	},
-	{ /* REFC root block */
-		.daddr = XFS_AGB_TO_DADDR(mp, id->agno, xfs_refc_block(mp)),
-		.numblks = BTOBB(mp->m_sb.sb_blocksize),
-		.ops = &xfs_refcountbt_buf_ops,
-		.work = &xfs_btroot_init,
-		.type = XFS_BTNUM_REFC,
-		.need_init = xfs_sb_version_hasreflink(&mp->m_sb)
-	},
-	{ /* NULL terminating block */
-		.daddr = XFS_BUF_DADDR_NULL,
-	}
-	};
-	struct  xfs_aghdr_grow_data *dp;
-	int			error = 0;
-
-	/* Account for AG free space in new AG */
-	id->nfree += id->agsize - mp->m_ag_prealloc_blocks;
-	for (dp = &aghdr_data[0]; dp->daddr != XFS_BUF_DADDR_NULL; dp++) {
-		if (!dp->need_init)
-			continue;
-
-		id->daddr = dp->daddr;
-		id->numblks = dp->numblks;
-		id->type = dp->type;
-		error = xfs_growfs_init_aghdr(mp, id, dp->work, dp->ops);
-		if (error)
-			break;
-	}
-	return error;
-}
-
 static int
 xfs_growfs_data_private(
 	xfs_mount_t		*mp,		/* mount point for filesystem */
@@ -518,7 +120,7 @@ xfs_growfs_data_private(
 		else
 			id.agsize = mp->m_sb.sb_agblocks;
 
-		error = xfs_grow_ag_headers(mp, &id);
+		error = xfs_ag_init_headers(mp, &id);
 		if (error) {
 			xfs_buf_delwri_cancel(&id.buffer_list);
 			goto out_trans_cancel;
@@ -682,79 +284,6 @@ xfs_growfs_imaxpct(
 	return xfs_trans_commit(tp);
 }
 
-/*
- * After a grow operation, we need to update all the secondary superblocks
- * to match the new state of the primary. Because we are completely overwriting
- * all the existing fields in the secondary superblock buffers, there is no need
- * to read them in from disk. Just get a new buffer, stamp it and write it.
- *
- * The sb buffers need to be cached here so that we serialise against scrub
- * scanning secondary superblocks, but we don't want to keep it in memory once
- * it is written so we mark it as a one-shot buffer.
- */
-static int
-xfs_growfs_update_superblocks(
-	struct xfs_mount	*mp)
-{
-	xfs_agnumber_t		agno;
-	int			saved_error = 0;
-	int			error = 0;
-	LIST_HEAD		(buffer_list);
-
-	/* update secondary superblocks. */
-	for (agno = 1; agno < mp->m_sb.sb_agcount; agno++) {
-		struct xfs_buf		*bp;
-
-		bp = xfs_buf_get(mp->m_ddev_targp,
-				 XFS_AG_DADDR(mp, agno, XFS_SB_DADDR),
-				 XFS_FSS_TO_BB(mp, 1), 0);
-		/*
-		 * If we get an error reading or writing alternate superblocks,
-		 * continue.  xfs_repair chooses the "best" superblock based
-		 * on most matches; if we break early, we'll leave more
-		 * superblocks un-updated than updated, and xfs_repair may
-		 * pick them over the properly-updated primary.
-		 */
-		if (!bp) {
-			xfs_warn(mp,
-		"error allocating secondary superblock for ag %d",
-				agno);
-			if (!saved_error)
-				saved_error = -ENOMEM;
-			continue;
-		}
-
-		bp->b_ops = &xfs_sb_buf_ops;
-		xfs_buf_oneshot(bp);
-		xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
-		xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb);
-		xfs_buf_delwri_queue(bp, &buffer_list);
-		xfs_buf_relse(bp);
-
-		/* don't hold too many buffers at once */
-		if (agno % 16)
-			continue;
-
-		error = xfs_buf_delwri_submit(&buffer_list);
-		if (error) {
-			xfs_warn(mp,
-		"write error %d updating a secondary superblock near ag %d",
-				error, agno);
-			if (!saved_error)
-				saved_error = error;
-			continue;
-		}
-	}
-	error = xfs_buf_delwri_submit(&buffer_list);
-	if (error) {
-		xfs_warn(mp,
-		"write error %d updating a secondary superblock near ag %d",
-			error, agno);
-	}
-
-	return saved_error ? saved_error : error;
-}
-
 /*
  * protected versions of growfs function acquire and release locks on the mount
  * point - exported through ioctls: XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG,
@@ -794,7 +323,7 @@ xfs_growfs_data(
 		mp->m_maxicount = 0;
 
 	/* Update secondary superblocks now the physical grow has completed */
-	error = xfs_growfs_update_superblocks(mp);
+	error = xfs_update_secondary_sbs(mp);
 
 out_error:
 	/*