Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016 Oracle.  All Rights Reserved.
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
#include "xfs_btree.h"
#include "xfs_btree_staging.h"
#include "xfs_refcount_btree.h"
#include "xfs_alloc.h"
#include "xfs_error.h"
#include "xfs_trace.h"
#include "xfs_trans.h"
#include "xfs_bit.h"
#include "xfs_rmap.h"
 
static struct xfs_btree_cur *
xfs_refcountbt_dup_cursor(
<------>struct xfs_btree_cur	*cur)
{
<------>return xfs_refcountbt_init_cursor(cur->bc_mp, cur->bc_tp,
<------><------><------>cur->bc_ag.agbp, cur->bc_ag.agno);
}
 
STATIC void
xfs_refcountbt_set_root(
<------>struct xfs_btree_cur	*cur,
<------>union xfs_btree_ptr	*ptr,
<------>int			inc)
{
<------>struct xfs_buf		*agbp = cur->bc_ag.agbp;
<------>struct xfs_agf		*agf = agbp->b_addr;
<------>struct xfs_perag	*pag = agbp->b_pag;
 
<------>ASSERT(ptr->s != 0);
 
<------>agf->agf_refcount_root = ptr->s;
<------>be32_add_cpu(&agf->agf_refcount_level, inc);
<------>pag->pagf_refcount_level += inc;
 
<------>xfs_alloc_log_agf(cur->bc_tp, agbp,
<------><------><------>XFS_AGF_REFCOUNT_ROOT | XFS_AGF_REFCOUNT_LEVEL);
}
 
STATIC int
xfs_refcountbt_alloc_block(
<------>struct xfs_btree_cur	*cur,
<------>union xfs_btree_ptr	*start,
<------>union xfs_btree_ptr	*new,
<------>int			*stat)
{
<------>struct xfs_buf		*agbp = cur->bc_ag.agbp;
<------>struct xfs_agf		*agf = agbp->b_addr;
<------>struct xfs_alloc_arg	args;		/* block allocation args */
<------>int			error;		/* error return value */
 
<------>memset(&args, 0, sizeof(args));
<------>args.tp = cur->bc_tp;
<------>args.mp = cur->bc_mp;
<------>args.type = XFS_ALLOCTYPE_NEAR_BNO;
<------>args.fsbno = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_ag.agno,
<------><------><------>xfs_refc_block(args.mp));
<------>args.oinfo = XFS_RMAP_OINFO_REFC;
<------>args.minlen = args.maxlen = args.prod = 1;
<------>args.resv = XFS_AG_RESV_METADATA;
 
<------>error = xfs_alloc_vextent(&args);
<------>if (error)
<------><------>goto out_error;
<------>trace_xfs_refcountbt_alloc_block(cur->bc_mp, cur->bc_ag.agno,
<------><------><------>args.agbno, 1);
<------>if (args.fsbno == NULLFSBLOCK) {
<------><------>*stat = 0;
<------><------>return 0;
<------>}
<------>ASSERT(args.agno == cur->bc_ag.agno);
<------>ASSERT(args.len == 1);
 
<------>new->s = cpu_to_be32(args.agbno);
<------>be32_add_cpu(&agf->agf_refcount_blocks, 1);
<------>xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
 
<------>*stat = 1;
<------>return 0;
 
out_error:
<------>return error;
}
 
STATIC int
xfs_refcountbt_free_block(
<------>struct xfs_btree_cur	*cur,
<------>struct xfs_buf		*bp)
{
<------>struct xfs_mount	*mp = cur->bc_mp;
<------>struct xfs_buf		*agbp = cur->bc_ag.agbp;
<------>struct xfs_agf		*agf = agbp->b_addr;
<------>xfs_fsblock_t		fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
<------>int			error;
 
<------>trace_xfs_refcountbt_free_block(cur->bc_mp, cur->bc_ag.agno,
<------><------><------>XFS_FSB_TO_AGBNO(cur->bc_mp, fsbno), 1);
<------>be32_add_cpu(&agf->agf_refcount_blocks, -1);
<------>xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
<------>error = xfs_free_extent(cur->bc_tp, fsbno, 1, &XFS_RMAP_OINFO_REFC,
<------><------><------>XFS_AG_RESV_METADATA);
<------>if (error)
<------><------>return error;
 
<------>return error;
}
 
STATIC int
xfs_refcountbt_get_minrecs(
<------>struct xfs_btree_cur	*cur,
<------>int			level)
{
<------>return cur->bc_mp->m_refc_mnr[level != 0];
}
 
STATIC int
xfs_refcountbt_get_maxrecs(
<------>struct xfs_btree_cur	*cur,
<------>int			level)
{
<------>return cur->bc_mp->m_refc_mxr[level != 0];
}
 
STATIC void
xfs_refcountbt_init_key_from_rec(
<------>union xfs_btree_key	*key,
<------>union xfs_btree_rec	*rec)
{
<------>key->refc.rc_startblock = rec->refc.rc_startblock;
}
 
STATIC void
xfs_refcountbt_init_high_key_from_rec(
<------>union xfs_btree_key	*key,
<------>union xfs_btree_rec	*rec)
{
<------>__u32			x;
 
<------>x = be32_to_cpu(rec->refc.rc_startblock);
<------>x += be32_to_cpu(rec->refc.rc_blockcount) - 1;
<------>key->refc.rc_startblock = cpu_to_be32(x);
}
 
STATIC void
xfs_refcountbt_init_rec_from_cur(
<------>struct xfs_btree_cur	*cur,
<------>union xfs_btree_rec	*rec)
{
<------>rec->refc.rc_startblock = cpu_to_be32(cur->bc_rec.rc.rc_startblock);
<------>rec->refc.rc_blockcount = cpu_to_be32(cur->bc_rec.rc.rc_blockcount);
<------>rec->refc.rc_refcount = cpu_to_be32(cur->bc_rec.rc.rc_refcount);
}
 
STATIC void
xfs_refcountbt_init_ptr_from_cur(
<------>struct xfs_btree_cur	*cur,
<------>union xfs_btree_ptr	*ptr)
{
<------>struct xfs_agf		*agf = cur->bc_ag.agbp->b_addr;
 
<------>ASSERT(cur->bc_ag.agno == be32_to_cpu(agf->agf_seqno));
 
<------>ptr->s = agf->agf_refcount_root;
}
 
STATIC int64_t
xfs_refcountbt_key_diff(
<------>struct xfs_btree_cur	*cur,
<------>union xfs_btree_key	*key)
{
<------>struct xfs_refcount_irec	*rec = &cur->bc_rec.rc;
<------>struct xfs_refcount_key		*kp = &key->refc;
 
<------>return (int64_t)be32_to_cpu(kp->rc_startblock) - rec->rc_startblock;
}
 
STATIC int64_t
xfs_refcountbt_diff_two_keys(
<------>struct xfs_btree_cur	*cur,
<------>union xfs_btree_key	*k1,
<------>union xfs_btree_key	*k2)
{
<------>return (int64_t)be32_to_cpu(k1->refc.rc_startblock) -
<------><------><------>  be32_to_cpu(k2->refc.rc_startblock);
}
 
STATIC xfs_failaddr_t
xfs_refcountbt_verify(
<------>struct xfs_buf		*bp)
{
<------>struct xfs_mount	*mp = bp->b_mount;
<------>struct xfs_btree_block	*block = XFS_BUF_TO_BLOCK(bp);
<------>struct xfs_perag	*pag = bp->b_pag;
<------>xfs_failaddr_t		fa;
<------>unsigned int		level;
 
<------>if (!xfs_verify_magic(bp, block->bb_magic))
<------><------>return __this_address;
 
<------>if (!xfs_sb_version_hasreflink(&mp->m_sb))
<------><------>return __this_address;
<------>fa = xfs_btree_sblock_v5hdr_verify(bp);
<------>if (fa)
<------><------>return fa;
 
<------>level = be16_to_cpu(block->bb_level);
<------>if (pag && pag->pagf_init) {
<------><------>if (level >= pag->pagf_refcount_level)
<------><------><------>return __this_address;
<------>} else if (level >= mp->m_refc_maxlevels)
<------><------>return __this_address;
 
<------>return xfs_btree_sblock_verify(bp, mp->m_refc_mxr[level != 0]);
}
 
STATIC void
xfs_refcountbt_read_verify(
<------>struct xfs_buf	*bp)
{
<------>xfs_failaddr_t	fa;
 
<------>if (!xfs_btree_sblock_verify_crc(bp))
<------><------>xfs_verifier_error(bp, -EFSBADCRC, __this_address);
<------>else {
<------><------>fa = xfs_refcountbt_verify(bp);
<------><------>if (fa)
<------><------><------>xfs_verifier_error(bp, -EFSCORRUPTED, fa);
<------>}
 
<------>if (bp->b_error)
<------><------>trace_xfs_btree_corrupt(bp, _RET_IP_);
}
 
STATIC void
xfs_refcountbt_write_verify(
<------>struct xfs_buf	*bp)
{
<------>xfs_failaddr_t	fa;
 
<------>fa = xfs_refcountbt_verify(bp);
<------>if (fa) {
<------><------>trace_xfs_btree_corrupt(bp, _RET_IP_);
<------><------>xfs_verifier_error(bp, -EFSCORRUPTED, fa);
<------><------>return;
<------>}
<------>xfs_btree_sblock_calc_crc(bp);
 
}
 
const struct xfs_buf_ops xfs_refcountbt_buf_ops = {
<------>.name			= "xfs_refcountbt",
<------>.magic			= { 0, cpu_to_be32(XFS_REFC_CRC_MAGIC) },
<------>.verify_read		= xfs_refcountbt_read_verify,
<------>.verify_write		= xfs_refcountbt_write_verify,
<------>.verify_struct		= xfs_refcountbt_verify,
};
 
STATIC int
xfs_refcountbt_keys_inorder(
<------>struct xfs_btree_cur	*cur,
<------>union xfs_btree_key	*k1,
<------>union xfs_btree_key	*k2)
{
<------>return be32_to_cpu(k1->refc.rc_startblock) <
<------>       be32_to_cpu(k2->refc.rc_startblock);
}
 
STATIC int
xfs_refcountbt_recs_inorder(
<------>struct xfs_btree_cur	*cur,
<------>union xfs_btree_rec	*r1,
<------>union xfs_btree_rec	*r2)
{
<------>return  be32_to_cpu(r1->refc.rc_startblock) +
<------><------>be32_to_cpu(r1->refc.rc_blockcount) <=
<------><------>be32_to_cpu(r2->refc.rc_startblock);
}
 
static const struct xfs_btree_ops xfs_refcountbt_ops = {
<------>.rec_len		= sizeof(struct xfs_refcount_rec),
<------>.key_len		= sizeof(struct xfs_refcount_key),
 
<------>.dup_cursor		= xfs_refcountbt_dup_cursor,
<------>.set_root		= xfs_refcountbt_set_root,
<------>.alloc_block		= xfs_refcountbt_alloc_block,
<------>.free_block		= xfs_refcountbt_free_block,
<------>.get_minrecs		= xfs_refcountbt_get_minrecs,
<------>.get_maxrecs		= xfs_refcountbt_get_maxrecs,
<------>.init_key_from_rec	= xfs_refcountbt_init_key_from_rec,
<------>.init_high_key_from_rec	= xfs_refcountbt_init_high_key_from_rec,
<------>.init_rec_from_cur	= xfs_refcountbt_init_rec_from_cur,
<------>.init_ptr_from_cur	= xfs_refcountbt_init_ptr_from_cur,
<------>.key_diff		= xfs_refcountbt_key_diff,
<------>.buf_ops		= &xfs_refcountbt_buf_ops,
<------>.diff_two_keys		= xfs_refcountbt_diff_two_keys,
<------>.keys_inorder		= xfs_refcountbt_keys_inorder,
<------>.recs_inorder		= xfs_refcountbt_recs_inorder,
};
 
/*
 * Initialize a new refcount btree cursor.
 */
static struct xfs_btree_cur *
xfs_refcountbt_init_common(
<------>struct xfs_mount	*mp,
<------>struct xfs_trans	*tp,
<------>xfs_agnumber_t		agno)
{
<------>struct xfs_btree_cur	*cur;
 
<------>ASSERT(agno != NULLAGNUMBER);
<------>ASSERT(agno < mp->m_sb.sb_agcount);
 
<------>cur = kmem_cache_zalloc(xfs_btree_cur_zone, GFP_NOFS | __GFP_NOFAIL);
<------>cur->bc_tp = tp;
<------>cur->bc_mp = mp;
<------>cur->bc_btnum = XFS_BTNUM_REFC;
<------>cur->bc_blocklog = mp->m_sb.sb_blocklog;
<------>cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_refcbt_2);
 
<------>cur->bc_ag.agno = agno;
<------>cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
 
<------>cur->bc_ag.refc.nr_ops = 0;
<------>cur->bc_ag.refc.shape_changes = 0;
<------>cur->bc_ops = &xfs_refcountbt_ops;
<------>return cur;
}
 
/* Create a btree cursor. */
struct xfs_btree_cur *
xfs_refcountbt_init_cursor(
<------>struct xfs_mount	*mp,
<------>struct xfs_trans	*tp,
<------>struct xfs_buf		*agbp,
<------>xfs_agnumber_t		agno)
{
<------>struct xfs_agf		*agf = agbp->b_addr;
<------>struct xfs_btree_cur	*cur;
 
<------>cur = xfs_refcountbt_init_common(mp, tp, agno);
<------>cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level);
<------>cur->bc_ag.agbp = agbp;
<------>return cur;
}
 
/* Create a btree cursor with a fake root for staging. */
struct xfs_btree_cur *
xfs_refcountbt_stage_cursor(
<------>struct xfs_mount	*mp,
<------>struct xbtree_afakeroot	*afake,
<------>xfs_agnumber_t		agno)
{
<------>struct xfs_btree_cur	*cur;
 
<------>cur = xfs_refcountbt_init_common(mp, NULL, agno);
<------>xfs_btree_stage_afakeroot(cur, afake);
<------>return cur;
}
 
/*
 * Swap in the new btree root.  Once we pass this point the newly rebuilt btree
 * is in place and we have to kill off all the old btree blocks.
 */
void
xfs_refcountbt_commit_staged_btree(
<------>struct xfs_btree_cur	*cur,
<------>struct xfs_trans	*tp,
<------>struct xfs_buf		*agbp)
{
<------>struct xfs_agf		*agf = agbp->b_addr;
<------>struct xbtree_afakeroot	*afake = cur->bc_ag.afake;
 
<------>ASSERT(cur->bc_flags & XFS_BTREE_STAGING);
 
<------>agf->agf_refcount_root = cpu_to_be32(afake->af_root);
<------>agf->agf_refcount_level = cpu_to_be32(afake->af_levels);
<------>agf->agf_refcount_blocks = cpu_to_be32(afake->af_blocks);
<------>xfs_alloc_log_agf(tp, agbp, XFS_AGF_REFCOUNT_BLOCKS |
<------><------><------><------>    XFS_AGF_REFCOUNT_ROOT |
<------><------><------><------>    XFS_AGF_REFCOUNT_LEVEL);
<------>xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_refcountbt_ops);
}
 
/*
 * Calculate the number of records in a refcount btree block.
 */
int
xfs_refcountbt_maxrecs(
<------>int			blocklen,
<------>bool			leaf)
{
<------>blocklen -= XFS_REFCOUNT_BLOCK_LEN;
 
<------>if (leaf)
<------><------>return blocklen / sizeof(struct xfs_refcount_rec);
<------>return blocklen / (sizeof(struct xfs_refcount_key) +
<------><------><------>   sizeof(xfs_refcount_ptr_t));
}
 
/* Compute the maximum height of a refcount btree. */
void
xfs_refcountbt_compute_maxlevels(
<------>struct xfs_mount		*mp)
{
<------>mp->m_refc_maxlevels = xfs_btree_compute_maxlevels(
<------><------><------>mp->m_refc_mnr, mp->m_sb.sb_agblocks);
}
 
/* Calculate the refcount btree size for some records. */
xfs_extlen_t
xfs_refcountbt_calc_size(
<------>struct xfs_mount	*mp,
<------>unsigned long long	len)
{
<------>return xfs_btree_calc_size(mp->m_refc_mnr, len);
}
 
/*
 * Calculate the maximum refcount btree size.
 */
xfs_extlen_t
xfs_refcountbt_max_size(
<------>struct xfs_mount	*mp,
<------>xfs_agblock_t		agblocks)
{
<------>/* Bail out if we're uninitialized, which can happen in mkfs. */
<------>if (mp->m_refc_mxr[0] == 0)
<------><------>return 0;
 
<------>return xfs_refcountbt_calc_size(mp, agblocks);
}
 
/*
 * Figure out how many blocks to reserve and how many are used by this btree.
 */
int
xfs_refcountbt_calc_reserves(
<------>struct xfs_mount	*mp,
<------>struct xfs_trans	*tp,
<------>xfs_agnumber_t		agno,
<------>xfs_extlen_t		*ask,
<------>xfs_extlen_t		*used)
{
<------>struct xfs_buf		*agbp;
<------>struct xfs_agf		*agf;
<------>xfs_agblock_t		agblocks;
<------>xfs_extlen_t		tree_len;
<------>int			error;
 
<------>if (!xfs_sb_version_hasreflink(&mp->m_sb))
<------><------>return 0;
 
 
<------>error = xfs_alloc_read_agf(mp, tp, agno, 0, &agbp);
<------>if (error)
<------><------>return error;
 
<------>agf = agbp->b_addr;
<------>agblocks = be32_to_cpu(agf->agf_length);
<------>tree_len = be32_to_cpu(agf->agf_refcount_blocks);
<------>xfs_trans_brelse(tp, agbp);
 
<------>/*
<------> * The log is permanently allocated, so the space it occupies will
<------> * never be available for the kinds of things that would require btree
<------> * expansion.  We therefore can pretend the space isn't there.
<------> */
<------>if (mp->m_sb.sb_logstart &&
<------>    XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart) == agno)
<------><------>agblocks -= mp->m_sb.sb_logblocks;
 
<------>*ask += xfs_refcountbt_max_size(mp, agblocks);
<------>*used += tree_len;
 
<------>return error;
}