[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_ialloc.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;
}

/*
 * Extent the AG indicated by the @id by the length passed in
 */
int
xfs_ag_extend_space(
	struct xfs_mount	*mp,
	struct xfs_trans	*tp,
	struct aghdr_init_data	*id,
	xfs_extlen_t		len)
{
	struct xfs_buf		*bp;
	struct xfs_agi		*agi;
	struct xfs_agf		*agf;
	int			error;

	/*
	 * Change the agi length.
	 */
	error = xfs_ialloc_read_agi(mp, tp, id->agno, &bp);
	if (error)
		return error;

	agi = XFS_BUF_TO_AGI(bp);
	be32_add_cpu(&agi->agi_length, len);
	ASSERT(id->agno == mp->m_sb.sb_agcount - 1 ||
	       be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
	xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);

	/*
	 * Change agf length.
	 */
	error = xfs_alloc_read_agf(mp, tp, id->agno, 0, &bp);
	if (error)
		return error;

	agf = XFS_BUF_TO_AGF(bp);
	be32_add_cpu(&agf->agf_length, len);
	ASSERT(agf->agf_length == agi->agi_length);
	xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);

	/*
	 * Free the new space.
	 *
	 * XFS_RMAP_OINFO_SKIP_UPDATE is used here to tell the rmap btree that
	 * this doesn't actually exist in the rmap btree.
	 */
	error = xfs_rmap_free(tp, bp, id->agno,
				be32_to_cpu(agf->agf_length) - len,
				len, &XFS_RMAP_OINFO_SKIP_UPDATE);
	if (error)
		return error;

	return  xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, id->agno,
					be32_to_cpu(agf->agf_length) - len),
				len, &XFS_RMAP_OINFO_SKIP_UPDATE,
				XFS_AG_RESV_NONE);
}
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"
8a895420	20	#include "xfs_ialloc.h"
971ce259 DC	21	#include "xfs_rmap.h"
	22	#include "xfs_ag.h"
	23
	24	static struct xfs_buf *
	25	xfs_get_aghdr_buf(
	26	struct xfs_mount *mp,
	27	xfs_daddr_t blkno,
	28	size_t numblks,
	29	int flags,
	30	const struct xfs_buf_ops *ops)
	31	{
	32	struct xfs_buf *bp;
	33
	34	bp = xfs_buf_get_uncached(mp->m_ddev_targp, numblks, flags);
	35	if (!bp)
	36	return NULL;
	37
	38	xfs_buf_zero(bp, 0, BBTOB(bp->b_length));
	39	bp->b_bn = blkno;
	40	bp->b_maps[0].bm_bn = blkno;
	41	bp->b_ops = ops;
	42
	43	return bp;
	44	}
	45
	46	/*
	47	* Generic btree root block init function
	48	*/
	49	static void
	50	xfs_btroot_init(
	51	struct xfs_mount *mp,
	52	struct xfs_buf *bp,
	53	struct aghdr_init_data *id)
	54	{
	55	xfs_btree_init_block(mp, bp, id->type, 0, 0, id->agno, 0);
	56	}
	57
	58	/*
	59	* Alloc btree root block init functions
	60	*/
	61	static void
	62	xfs_bnoroot_init(
	63	struct xfs_mount *mp,
	64	struct xfs_buf *bp,
	65	struct aghdr_init_data *id)
	66	{
	67	struct xfs_alloc_rec *arec;
	68
	69	xfs_btree_init_block(mp, bp, XFS_BTNUM_BNO, 0, 1, id->agno, 0);
	70	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
	71	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
	72	arec->ar_blockcount = cpu_to_be32(id->agsize -
	73	be32_to_cpu(arec->ar_startblock));
	74	}
	75
	76	static void
	77	xfs_cntroot_init(
	78	struct xfs_mount *mp,
	79	struct xfs_buf *bp,
	80	struct aghdr_init_data *id)
	81	{
	82	struct xfs_alloc_rec *arec;
	83
	84	xfs_btree_init_block(mp, bp, XFS_BTNUM_CNT, 0, 1, id->agno, 0);
85	arec = XFS_ALLOC_REC_ADDR(mp, XFS_BUF_TO_BLOCK(bp), 1);
86	arec->ar_startblock = cpu_to_be32(mp->m_ag_prealloc_blocks);
87	arec->ar_blockcount = cpu_to_be32(id->agsize -
88	be32_to_cpu(arec->ar_startblock));
89	}
90
91	/*
92	* Reverse map root block init
93	*/
94	static void
95	xfs_rmaproot_init(
96	struct xfs_mount *mp,
97	struct xfs_buf *bp,
98	struct aghdr_init_data *id)
99	{
100	struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
101	struct xfs_rmap_rec *rrec;
102
103	xfs_btree_init_block(mp, bp, XFS_BTNUM_RMAP, 0, 4, id->agno, 0);
104
105	/*
106	* mark the AG header regions as static metadata The BNO
107	* btree block is the first block after the headers, so
108	* it's location defines the size of region the static
109	* metadata consumes.
110	*
111	* Note: unlike mkfs, we never have to account for log
112	* space when growing the data regions
113	*/
114	rrec = XFS_RMAP_REC_ADDR(block, 1);
115	rrec->rm_startblock = 0;
116	rrec->rm_blockcount = cpu_to_be32(XFS_BNO_BLOCK(mp));
117	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_FS);
118	rrec->rm_offset = 0;
119
120	/* account freespace btree root blocks */
121	rrec = XFS_RMAP_REC_ADDR(block, 2);
122	rrec->rm_startblock = cpu_to_be32(XFS_BNO_BLOCK(mp));
123	rrec->rm_blockcount = cpu_to_be32(2);
124	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
125	rrec->rm_offset = 0;
126
127	/* account inode btree root blocks */
128	rrec = XFS_RMAP_REC_ADDR(block, 3);
129	rrec->rm_startblock = cpu_to_be32(XFS_IBT_BLOCK(mp));
130	rrec->rm_blockcount = cpu_to_be32(XFS_RMAP_BLOCK(mp) -
131	XFS_IBT_BLOCK(mp));
132	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_INOBT);
133	rrec->rm_offset = 0;
134
135	/* account for rmap btree root */
136	rrec = XFS_RMAP_REC_ADDR(block, 4);
137	rrec->rm_startblock = cpu_to_be32(XFS_RMAP_BLOCK(mp));
138	rrec->rm_blockcount = cpu_to_be32(1);
139	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_AG);
140	rrec->rm_offset = 0;
141
142	/* account for refc btree root */
143	if (xfs_sb_version_hasreflink(&mp->m_sb)) {
144	rrec = XFS_RMAP_REC_ADDR(block, 5);
145	rrec->rm_startblock = cpu_to_be32(xfs_refc_block(mp));
146	rrec->rm_blockcount = cpu_to_be32(1);
147	rrec->rm_owner = cpu_to_be64(XFS_RMAP_OWN_REFC);
148	rrec->rm_offset = 0;
149	be16_add_cpu(&block->bb_numrecs, 1);
150	}
151	}
152
153	/*
154	* Initialise new secondary superblocks with the pre-grow geometry, but mark
155	* them as "in progress" so we know they haven't yet been activated. This will
156	* get cleared when the update with the new geometry information is done after
157	* changes to the primary are committed. This isn't strictly necessary, but we
158	* get it for free with the delayed buffer write lists and it means we can tell
159	* if a grow operation didn't complete properly after the fact.
160	*/
161	static void
162	xfs_sbblock_init(
163	struct xfs_mount *mp,
164	struct xfs_buf *bp,
165	struct aghdr_init_data *id)
166	{
167	struct xfs_dsb *dsb = XFS_BUF_TO_SBP(bp);
168
169	xfs_sb_to_disk(dsb, &mp->m_sb);
170	dsb->sb_inprogress = 1;
171	}
172
173	static void
174	xfs_agfblock_init(
175	struct xfs_mount *mp,
176	struct xfs_buf *bp,
177	struct aghdr_init_data *id)
178	{
179	struct xfs_agf *agf = XFS_BUF_TO_AGF(bp);
180	xfs_extlen_t tmpsize;
181
182	agf->agf_magicnum = cpu_to_be32(XFS_AGF_MAGIC);
183	agf->agf_versionnum = cpu_to_be32(XFS_AGF_VERSION);
184	agf->agf_seqno = cpu_to_be32(id->agno);
185	agf->agf_length = cpu_to_be32(id->agsize);
186	agf->agf_roots[XFS_BTNUM_BNOi] = cpu_to_be32(XFS_BNO_BLOCK(mp));
187	agf->agf_roots[XFS_BTNUM_CNTi] = cpu_to_be32(XFS_CNT_BLOCK(mp));
188	agf->agf_levels[XFS_BTNUM_BNOi] = cpu_to_be32(1);
189	agf->agf_levels[XFS_BTNUM_CNTi] = cpu_to_be32(1);
190	if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
191	agf->agf_roots[XFS_BTNUM_RMAPi] =
192	cpu_to_be32(XFS_RMAP_BLOCK(mp));
193	agf->agf_levels[XFS_BTNUM_RMAPi] = cpu_to_be32(1);
194	agf->agf_rmap_blocks = cpu_to_be32(1);
195	}
196
197	agf->agf_flfirst = cpu_to_be32(1);
198	agf->agf_fllast = 0;
199	agf->agf_flcount = 0;
200	tmpsize = id->agsize - mp->m_ag_prealloc_blocks;
201	agf->agf_freeblks = cpu_to_be32(tmpsize);
202	agf->agf_longest = cpu_to_be32(tmpsize);
203	if (xfs_sb_version_hascrc(&mp->m_sb))
204	uuid_copy(&agf->agf_uuid, &mp->m_sb.sb_meta_uuid);
205	if (xfs_sb_version_hasreflink(&mp->m_sb)) {
206	agf->agf_refcount_root = cpu_to_be32(
207	xfs_refc_block(mp));
208	agf->agf_refcount_level = cpu_to_be32(1);
209	agf->agf_refcount_blocks = cpu_to_be32(1);
210	}
211	}
212
213	static void
214	xfs_agflblock_init(
215	struct xfs_mount *mp,
216	struct xfs_buf *bp,
217	struct aghdr_init_data *id)
218	{
219	struct xfs_agfl *agfl = XFS_BUF_TO_AGFL(bp);
220	__be32 *agfl_bno;
221	int bucket;
222
223	if (xfs_sb_version_hascrc(&mp->m_sb)) {
224	agfl->agfl_magicnum = cpu_to_be32(XFS_AGFL_MAGIC);
225	agfl->agfl_seqno = cpu_to_be32(id->agno);
226	uuid_copy(&agfl->agfl_uuid, &mp->m_sb.sb_meta_uuid);
227	}
228
229	agfl_bno = XFS_BUF_TO_AGFL_BNO(mp, bp);
230	for (bucket = 0; bucket < xfs_agfl_size(mp); bucket++)
231	agfl_bno[bucket] = cpu_to_be32(NULLAGBLOCK);
232	}
233
234	static void
235	xfs_agiblock_init(
236	struct xfs_mount *mp,
237	struct xfs_buf *bp,
238	struct aghdr_init_data *id)
239	{
240	struct xfs_agi *agi = XFS_BUF_TO_AGI(bp);
241	int bucket;
242
243	agi->agi_magicnum = cpu_to_be32(XFS_AGI_MAGIC);
244	agi->agi_versionnum = cpu_to_be32(XFS_AGI_VERSION);
245	agi->agi_seqno = cpu_to_be32(id->agno);
246	agi->agi_length = cpu_to_be32(id->agsize);
247	agi->agi_count = 0;
248	agi->agi_root = cpu_to_be32(XFS_IBT_BLOCK(mp));
249	agi->agi_level = cpu_to_be32(1);
250	agi->agi_freecount = 0;
251	agi->agi_newino = cpu_to_be32(NULLAGINO);
252	agi->agi_dirino = cpu_to_be32(NULLAGINO);
253	if (xfs_sb_version_hascrc(&mp->m_sb))
254	uuid_copy(&agi->agi_uuid, &mp->m_sb.sb_meta_uuid);
255	if (xfs_sb_version_hasfinobt(&mp->m_sb)) {
256	agi->agi_free_root = cpu_to_be32(XFS_FIBT_BLOCK(mp));
257	agi->agi_free_level = cpu_to_be32(1);
258	}
259	for (bucket = 0; bucket < XFS_AGI_UNLINKED_BUCKETS; bucket++)
260	agi->agi_unlinked[bucket] = cpu_to_be32(NULLAGINO);
261	}
262
263	typedef void (aghdr_init_work_f)(struct xfs_mount mp, struct xfs_buf *bp,
264	struct aghdr_init_data *id);
265	static int
266	xfs_ag_init_hdr(
267	struct xfs_mount *mp,
268	struct aghdr_init_data *id,
269	aghdr_init_work_f work,
270	const struct xfs_buf_ops *ops)
271
272	{
273	struct xfs_buf *bp;
274
275	bp = xfs_get_aghdr_buf(mp, id->daddr, id->numblks, 0, ops);
276	if (!bp)
277	return -ENOMEM;
278
279	(*work)(mp, bp, id);
280
281	xfs_buf_delwri_queue(bp, &id->buffer_list);
282	xfs_buf_relse(bp);
283	return 0;
284	}
285
286	struct xfs_aghdr_grow_data {
287	xfs_daddr_t daddr;
288	size_t numblks;
289	const struct xfs_buf_ops *ops;
290	aghdr_init_work_f work;
291	xfs_btnum_t type;
292	bool need_init;
293	};
294
295	/*
296	* Prepare new AG headers to be written to disk. We use uncached buffers here,
297	* as it is assumed these new AG headers are currently beyond the currently
298	* valid filesystem address space. Using cached buffers would trip over EOFS
299	* corruption detection alogrithms in the buffer cache lookup routines.
300	*
301	* This is a non-transactional function, but the prepared buffers are added to a
302	* delayed write buffer list supplied by the caller so they can submit them to
303	* disk and wait on them as required.
304	*/
305	int
306	xfs_ag_init_headers(
307	struct xfs_mount *mp,
308	struct aghdr_init_data *id)
309
310	{
311	struct xfs_aghdr_grow_data aghdr_data[] = {
312	{ /* SB */
313	.daddr = XFS_AG_DADDR(mp, id->agno, XFS_SB_DADDR),
314	.numblks = XFS_FSS_TO_BB(mp, 1),
315	.ops = &xfs_sb_buf_ops,
316	.work = &xfs_sbblock_init,
317	.need_init = true
318	},
319	{ /* AGF */
320	.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGF_DADDR(mp)),
321	.numblks = XFS_FSS_TO_BB(mp, 1),
322	.ops = &xfs_agf_buf_ops,
323	.work = &xfs_agfblock_init,
324	.need_init = true
325	},
326	{ /* AGFL */
327	.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGFL_DADDR(mp)),
328	.numblks = XFS_FSS_TO_BB(mp, 1),
329	.ops = &xfs_agfl_buf_ops,
330	.work = &xfs_agflblock_init,
331	.need_init = true
332	},
333	{ /* AGI */
334	.daddr = XFS_AG_DADDR(mp, id->agno, XFS_AGI_DADDR(mp)),
335	.numblks = XFS_FSS_TO_BB(mp, 1),
336	.ops = &xfs_agi_buf_ops,
337	.work = &xfs_agiblock_init,
338	.need_init = true
339	},
340	{ /* BNO root block */
341	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_BNO_BLOCK(mp)),
342	.numblks = BTOBB(mp->m_sb.sb_blocksize),
343	.ops = &xfs_allocbt_buf_ops,
344	.work = &xfs_bnoroot_init,
345	.need_init = true
346	},
347	{ /* CNT root block */
348	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_CNT_BLOCK(mp)),
349	.numblks = BTOBB(mp->m_sb.sb_blocksize),
350	.ops = &xfs_allocbt_buf_ops,
351	.work = &xfs_cntroot_init,
352	.need_init = true
353	},
354	{ /* INO root block */
355	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_IBT_BLOCK(mp)),
356	.numblks = BTOBB(mp->m_sb.sb_blocksize),
357	.ops = &xfs_inobt_buf_ops,
358	.work = &xfs_btroot_init,
359	.type = XFS_BTNUM_INO,
360	.need_init = true
361	},
362	{ /* FINO root block */
363	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_FIBT_BLOCK(mp)),
364	.numblks = BTOBB(mp->m_sb.sb_blocksize),
365	.ops = &xfs_inobt_buf_ops,
366	.work = &xfs_btroot_init,
367	.type = XFS_BTNUM_FINO,
368	.need_init = xfs_sb_version_hasfinobt(&mp->m_sb)
369	},
370	{ /* RMAP root block */
371	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, XFS_RMAP_BLOCK(mp)),
372	.numblks = BTOBB(mp->m_sb.sb_blocksize),
373	.ops = &xfs_rmapbt_buf_ops,
374	.work = &xfs_rmaproot_init,
375	.need_init = xfs_sb_version_hasrmapbt(&mp->m_sb)
376	},
377	{ /* REFC root block */
378	.daddr = XFS_AGB_TO_DADDR(mp, id->agno, xfs_refc_block(mp)),
379	.numblks = BTOBB(mp->m_sb.sb_blocksize),
380	.ops = &xfs_refcountbt_buf_ops,
381	.work = &xfs_btroot_init,
382	.type = XFS_BTNUM_REFC,
383	.need_init = xfs_sb_version_hasreflink(&mp->m_sb)
384	},
385	{ /* NULL terminating block */
386	.daddr = XFS_BUF_DADDR_NULL,
387	}
388	};
389	struct xfs_aghdr_grow_data *dp;
390	int error = 0;
391
392	/* Account for AG free space in new AG */
393	id->nfree += id->agsize - mp->m_ag_prealloc_blocks;
394	for (dp = &aghdr_data[0]; dp->daddr != XFS_BUF_DADDR_NULL; dp++) {
395	if (!dp->need_init)
396	continue;
397
398	id->daddr = dp->daddr;
399	id->numblks = dp->numblks;
400	id->type = dp->type;
401	error = xfs_ag_init_hdr(mp, id, dp->work, dp->ops);
402	if (error)
403	break;
404	}
405	return error;
406	}
8a895420 DC	407
	408	/*
	409	* Extent the AG indicated by the @id by the length passed in
	410	*/
	411	int
	412	xfs_ag_extend_space(
	413	struct xfs_mount *mp,
	414	struct xfs_trans *tp,
	415	struct aghdr_init_data *id,
	416	xfs_extlen_t len)
	417	{
8a895420 DC	418	struct xfs_buf *bp;
	419	struct xfs_agi *agi;
	420	struct xfs_agf *agf;
	421	int error;
	422
	423	/*
	424	* Change the agi length.
	425	*/
	426	error = xfs_ialloc_read_agi(mp, tp, id->agno, &bp);
	427	if (error)
	428	return error;
	429
	430	agi = XFS_BUF_TO_AGI(bp);
	431	be32_add_cpu(&agi->agi_length, len);
	432	ASSERT(id->agno == mp->m_sb.sb_agcount - 1 \|\|
	433	be32_to_cpu(agi->agi_length) == mp->m_sb.sb_agblocks);
	434	xfs_ialloc_log_agi(tp, bp, XFS_AGI_LENGTH);
	435
	436	/*
	437	* Change agf length.
	438	*/
	439	error = xfs_alloc_read_agf(mp, tp, id->agno, 0, &bp);
	440	if (error)
	441	return error;
	442
	443	agf = XFS_BUF_TO_AGF(bp);
	444	be32_add_cpu(&agf->agf_length, len);
	445	ASSERT(agf->agf_length == agi->agi_length);
	446	xfs_alloc_log_agf(tp, bp, XFS_AGF_LENGTH);
	447
	448	/*
	449	* Free the new space.
	450	*
007347e3	451	* XFS_RMAP_OINFO_SKIP_UPDATE is used here to tell the rmap btree that
8a895420 DC	452	* this doesn't actually exist in the rmap btree.
8a895420 DC	453	*/
8a895420 DC	454	error = xfs_rmap_free(tp, bp, id->agno,
8a895420 DC	455	be32_to_cpu(agf->agf_length) - len,
007347e3	456	len, &XFS_RMAP_OINFO_SKIP_UPDATE);
8a895420 DC	457	if (error)
	458	return error;
	459
	460	return xfs_free_extent(tp, XFS_AGB_TO_FSB(mp, id->agno,
	461	be32_to_cpu(agf->agf_length) - len),
007347e3 DW	462	len, &XFS_RMAP_OINFO_SKIP_UPDATE,
007347e3 DW	463	XFS_AG_RESV_NONE);
8a895420	464	}