[thirdparty/xfsprogs-dev.git] / libxfs / xfs_ag.c

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * Copyright (c) 2018 Red Hat, Inc.
 * All rights reserved.
 */

#include "libxfs_priv.h"
#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;
}
Commit	Line	Data
971ce259 DC	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/*
	3	* Copyright (c) 2000-2005 Silicon Graphics, Inc.
	4	* Copyright (c) 2018 Red Hat, Inc.
	5	* All rights reserved.
	6	*/
	7
	8	#include "libxfs_priv.h"
	9	#include "xfs.h"
	10	#include "xfs_fs.h"
	11	#include "xfs_shared.h"
	12	#include "xfs_format.h"
	13	#include "xfs_trans_resv.h"
	14	#include "xfs_sb.h"
	15	#include "xfs_mount.h"
	16	#include "xfs_btree.h"
	17	#include "xfs_alloc_btree.h"
	18	#include "xfs_rmap_btree.h"
	19	#include "xfs_alloc.h"
	20	#include "xfs_rmap.h"
	21	#include "xfs_ag.h"
	22
	23	static struct xfs_buf *
	24	xfs_get_aghdr_buf(
	25	struct xfs_mount *mp,
	26	xfs_daddr_t blkno,
	27	size_t numblks,
	28	int flags,
	29	const struct xfs_buf_ops *ops)
	30	{
	31	struct xfs_buf *bp;
	32
	33	bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
	34	if (!bp)
	35	return NULL;
	36
	37	xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
	38	bp->b_bn = blkno;
	39	bp->b_maps[0].bm_bn = blkno;
	40	bp->b_ops = ops;
	41
	42	return bp;
	43	}
	44
	45	/*
	46	* Generic btree root block init function
	47	*/
	48	static void
	49	xfs_btroot_init(
	50	struct xfs_mount *mp,
	51	struct xfs_buf *bp,
	52	struct aghdr_init_data *id)
	53	{
	54	xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno, 0);
	55	}
	56
	57	/*
	58	* Alloc btree root block init functions
	59	*/
	60	static void
	61	xfs_bnoroot_init(
	62	struct xfs_mount *mp,
	63	struct xfs_buf *bp,
	64	struct aghdr_init_data *id)
65	{
66	struct xfs_alloc_rec *arec;
67
68	xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno, 0);
69	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
70	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
71	arec->ar_blockcount = cpu_to_be32(id->agsize -
72	be32_to_cpu(arec->ar_startblock));
73	}
74
75	static void
76	xfs_cntroot_init(
77	struct xfs_mount *mp,
78	struct xfs_buf *bp,
79	struct aghdr_init_data *id)
80	{
81	struct xfs_alloc_rec *arec;
82
83	xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno, 0);
84	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
85	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
86	arec->ar_blockcount = cpu_to_be32(id->agsize -
87	be32_to_cpu(arec->ar_startblock));
88	}
89
90	/*
91	* Reverse map root block init
92	*/
93	static void
94	xfs_rmaproot_init(
95	struct xfs_mount *mp,
96	struct xfs_buf *bp,
97	struct aghdr_init_data *id)
98	{
99	struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
100	struct xfs_rmap_rec *rrec;
101
102	xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno, 0);
103
104	/*
105	* mark the AG header regions as static metadata The BNO
106	* btree block is the first block after the headers, so
107	* it's location defines the size of region the static
108	* metadata consumes.
109	*
110	* Note: unlike mkfs, we never have to account for log
111	* space when growing the data regions
112	*/
113	rrec = XFS_RMAP_REC_ADDR(block, 1);
114	rrec->rm_startblock = 0;
115	rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
116	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
117	rrec->rm_offset = 0;
118
119	/* account freespace btree root blocks */
120	rrec = XFS_RMAP_REC_ADDR(block, 2);
121	rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
122	rrec->rm_blockcount = cpu_to_be32(2);
123	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
124	rrec->rm_offset = 0;
125
126	/* account inode btree root blocks */
127	rrec = XFS_RMAP_REC_ADDR(block, 3);
128	rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
129	rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
130	XFS_IBT_BLOCK(mp));
131	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
132	rrec->rm_offset = 0;
133
134	/* account for rmap btree root */
135	rrec = XFS_RMAP_REC_ADDR(block, 4);
136	rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
137	rrec->rm_blockcount = cpu_to_be32(1);
138	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
139	rrec->rm_offset = 0;
140
141	/* account for refc btree root */
142	if (xfs_sb_version_hasreflink(&mp->m_sb)) {
143	rrec = XFS_RMAP_REC_ADDR(block, 5);
144	rrec->rm_startblock = cpu_to_be32(xfs_refc_block(mp));
145	rrec->rm_blockcount = cpu_to_be32(1);
146	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
147	rrec->rm_offset = 0;
148	be16_add_cpu(&block->bb_numrecs, 1);
149	}
150	}
151
152	/*
153	* Initialise new secondary superblocks with the pre-grow geometry, but mark
154	* them as "in progress" so we know they haven't yet been activated. This will
155	* get cleared when the update with the new geometry information is done after
156	* changes to the primary are committed. This isn't strictly necessary, but we
157	* get it for free with the delayed buffer write lists and it means we can tell
158	* if a grow operation didn't complete properly after the fact.
159	*/
160	static void
161	xfs_sbblock_init(
162	struct xfs_mount *mp,
163	struct xfs_buf *bp,
164	struct aghdr_init_data *id)
165	{
166	struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp);
167
168	xfs_sb_to_disk(dsb, &mp->m_sb);
169	dsb->sb_inprogress = 1;
170	}
171
172	static void
173	xfs_agfblock_init(
174	struct xfs_mount *mp,
175	struct xfs_buf *bp,
176	struct aghdr_init_data *id)
177	{
178	struct xfs_agf *agf = XFS_BUF_TO_AGF(bp);
179	xfs_extlen_t tmpsize;
180
181	agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
182	agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
183	agf->agf_seqno = cpu_to_be32(id->agno);
184	agf->agf_length = cpu_to_be32(id->agsize);
185	agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
186	agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
187	agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
188	agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
189	if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
190	agf->agf_roots[XFS_BTNUM_RMAPi] =
191	cpu_to_be32(XFS_RMAP_BLOCK(mp));
192	agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
193	agf->agf_rmap_blocks = cpu_to_be32(1);
194	}
195
196	agf->agf_flfirst = cpu_to_be32(1);
197	agf->agf_fllast = 0;
198	agf->agf_flcount = 0;
199	tmpsize = id->agsize - mp->m_ag_prealloc_blocks;
200	agf->agf_freeblks = cpu_to_be32(tmpsize);
201	agf->agf_longest = cpu_to_be32(tmpsize);
202	if (xfs_sb_version_hascrc(&mp->m_sb))
203	uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
204	if (xfs_sb_version_hasreflink(&mp->m_sb)) {
205	agf->agf_refcount_root = cpu_to_be32(
206	xfs_refc_block(mp));
207	agf->agf_refcount_level = cpu_to_be32(1);
208	agf->agf_refcount_blocks = cpu_to_be32(1);
209	}
210	}
211
212	static void
213	xfs_agflblock_init(
214	struct xfs_mount *mp,
215	struct xfs_buf *bp,
216	struct aghdr_init_data *id)
217	{
218	struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp);
219	__be32 *agfl_bno;
220	int bucket;
221
222	if (xfs_sb_version_hascrc(&mp->m_sb)) {
223	agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
224	agfl->agfl_seqno = cpu_to_be32(id->agno);
225	uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
226	}
227
228	agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
229	for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++)
230	agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
231	}
232
233	static void
234	xfs_agiblock_init(
235	struct xfs_mount *mp,
236	struct xfs_buf *bp,
237	struct aghdr_init_data *id)
238	{
239	struct xfs_agi *agi = XFS_BUF_TO_AGI(bp);
240	int bucket;
241
242	agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
243	agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
244	agi->agi_seqno = cpu_to_be32(id->agno);
245	agi->agi_length = cpu_to_be32(id->agsize);
246	agi->agi_count = 0;
247	agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
248	agi->agi_level = cpu_to_be32(1);
249	agi->agi_freecount = 0;
250	agi->agi_newino = cpu_to_be32(NULLAGINO);
251	agi->agi_dirino = cpu_to_be32(NULLAGINO);
252	if (xfs_sb_version_hascrc(&mp->m_sb))
253	uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
254	if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
255	agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
256	agi->agi_free_level = cpu_to_be32(1);
257	}
258	for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
259	agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
260	}
261
262	typedef void (aghdr_init_work_f)(struct xfs_mount mp, struct xfs_buf *bp,
263	struct aghdr_init_data *id);
264	static int
265	xfs_ag_init_hdr(
266	struct xfs_mount *mp,
267	struct aghdr_init_data *id,
268	aghdr_init_work_f work,
269	const struct xfs_buf_ops *ops)
270
271	{
272	struct xfs_buf *bp;
273
274	bp = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, 0, ops);
275	if (!bp)
276	return -ENOMEM;
277
278	(*work)(mp, bp, id);
279
280	xfs_buf_delwri_queue(bp, &id->buffer_list);
281	xfs_buf_relse(bp);
282	return 0;
283	}
284
285	struct xfs_aghdr_grow_data {
286	xfs_daddr_t daddr;
287	size_t numblks;
288	const struct xfs_buf_ops *ops;
289	aghdr_init_work_f work;
290	xfs_btnum_t type;
291	bool need_init;
292	};
293
294	/*
295	* Prepare new AG headers to be written to disk. We use uncached buffers here,
296	* as it is assumed these new AG headers are currently beyond the currently
297	* valid filesystem address space. Using cached buffers would trip over EOFS
298	* corruption detection alogrithms in the buffer cache lookup routines.
299	*
300	* This is a non-transactional function, but the prepared buffers are added to a
301	* delayed write buffer list supplied by the caller so they can submit them to
302	* disk and wait on them as required.
303	*/
304	int
305	xfs_ag_init_headers(
306	struct xfs_mount *mp,
307	struct aghdr_init_data *id)
308
309	{
310	struct xfs_aghdr_grow_data aghdr_data[] = {
311	{ /* SB */
312	.daddr = XFS_AG_DADDR(mp, id->agno, XFS_SB_DADDR),
313	.numblks = XFS_FSS_TO_BB(mp, 1),
314	.ops = &xfs_sb_buf_ops,
315	.work = &xfs_sbblock_init,
316	.need_init = true
317	},
318	{ /* AGF */
319	.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGF_DADDR(mp)),
320	.numblks = XFS_FSS_TO_BB(mp, 1),
321	.ops = &xfs_agf_buf_ops,
322	.work = &xfs_agfblock_init,
323	.need_init = true
324	},
325	{ /* AGFL */
326	.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGFL_DADDR(mp)),
327	.numblks = XFS_FSS_TO_BB(mp, 1),
328	.ops = &xfs_agfl_buf_ops,
329	.work = &xfs_agflblock_init,
330	.need_init = true
331	},
332	{ /* AGI */
333	.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGI_DADDR(mp)),
334	.numblks = XFS_FSS_TO_BB(mp, 1),
335	.ops = &xfs_agi_buf_ops,
336	.work = &xfs_agiblock_init,
337	.need_init = true
338	},
339	{ /* BNO root block */
340	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)),
341	.numblks = BTOBB(mp->m_sb.sb_blocksize),
342	.ops = &xfs_allocbt_buf_ops,
343	.work = &xfs_bnoroot_init,
344	.need_init = true
345	},
346	{ /* CNT root block */
347	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)),
348	.numblks = BTOBB(mp->m_sb.sb_blocksize),
349	.ops = &xfs_allocbt_buf_ops,
350	.work = &xfs_cntroot_init,
351	.need_init = true
352	},
353	{ /* INO root block */
354	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_IBT_BLOCK(mp)),
355	.numblks = BTOBB(mp->m_sb.sb_blocksize),
356	.ops = &xfs_inobt_buf_ops,
357	.work = &xfs_btroot_init,
358	.type = XFS_BTNUM_INO,
359	.need_init = true
360	},
361	{ /* FINO root block */
362	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)),
363	.numblks = BTOBB(mp->m_sb.sb_blocksize),
364	.ops = &xfs_inobt_buf_ops,
365	.work = &xfs_btroot_init,
366	.type = XFS_BTNUM_FINO,
367	.need_init = xfs_sb_version_hasfinobt(&mp->m_sb)
368	},
369	{ /* RMAP root block */
370	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_RMAP_BLOCK(mp)),
371	.numblks = BTOBB(mp->m_sb.sb_blocksize),
372	.ops = &xfs_rmapbt_buf_ops,
373	.work = &xfs_rmaproot_init,
374	.need_init = xfs_sb_version_hasrmapbt(&mp->m_sb)
375	},
376	{ /* REFC root block */
377	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, xfs_refc_block(mp)),
378	.numblks = BTOBB(mp->m_sb.sb_blocksize),
379	.ops = &xfs_refcountbt_buf_ops,
380	.work = &xfs_btroot_init,
381	.type = XFS_BTNUM_REFC,
382	.need_init = xfs_sb_version_hasreflink(&mp->m_sb)
383	},
384	{ /* NULL terminating block */
385	.daddr = XFS_BUF_DADDR_NULL,
386	}
387	};
388	struct xfs_aghdr_grow_data *dp;
389	int error = 0;
390
391	/* Account for AG free space in new AG */
392	id->nfree += id->agsize - mp->m_ag_prealloc_blocks;
393	for (dp = &aghdr_data[0]; dp->daddr != XFS_BUF_DADDR_NULL; dp++) {
394	if (!dp->need_init)
395	continue;
396
397	id->daddr = dp->daddr;
398	id->numblks = dp->numblks;
399	id->type = dp->type;
400	error = xfs_ag_init_hdr(mp, id, dp->work, dp->ops);
401	if (error)
402	break;
403	}
404	return error;
405	}