mirror of https://gitee.com/openkylin/linux.git
460 lines
11 KiB
C
460 lines
11 KiB
C
/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_sb.h"
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#include "xfs_mount.h"
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#include "xfs_btree.h"
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#include "xfs_bmap.h"
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#include "xfs_refcount_btree.h"
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#include "xfs_alloc.h"
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#include "xfs_error.h"
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#include "xfs_trace.h"
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#include "xfs_cksum.h"
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#include "xfs_trans.h"
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#include "xfs_bit.h"
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#include "xfs_rmap.h"
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static struct xfs_btree_cur *
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xfs_refcountbt_dup_cursor(
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struct xfs_btree_cur *cur)
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{
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return xfs_refcountbt_init_cursor(cur->bc_mp, cur->bc_tp,
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cur->bc_private.a.agbp, cur->bc_private.a.agno,
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cur->bc_private.a.dfops);
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}
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STATIC void
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xfs_refcountbt_set_root(
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struct xfs_btree_cur *cur,
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union xfs_btree_ptr *ptr,
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int inc)
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{
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struct xfs_buf *agbp = cur->bc_private.a.agbp;
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struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
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xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
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struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno);
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ASSERT(ptr->s != 0);
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agf->agf_refcount_root = ptr->s;
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be32_add_cpu(&agf->agf_refcount_level, inc);
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pag->pagf_refcount_level += inc;
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xfs_perag_put(pag);
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xfs_alloc_log_agf(cur->bc_tp, agbp,
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XFS_AGF_REFCOUNT_ROOT | XFS_AGF_REFCOUNT_LEVEL);
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}
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STATIC int
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xfs_refcountbt_alloc_block(
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struct xfs_btree_cur *cur,
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union xfs_btree_ptr *start,
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union xfs_btree_ptr *new,
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int *stat)
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{
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struct xfs_buf *agbp = cur->bc_private.a.agbp;
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struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
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struct xfs_alloc_arg args; /* block allocation args */
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int error; /* error return value */
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XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
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memset(&args, 0, sizeof(args));
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args.tp = cur->bc_tp;
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args.mp = cur->bc_mp;
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args.type = XFS_ALLOCTYPE_NEAR_BNO;
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args.fsbno = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_private.a.agno,
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xfs_refc_block(args.mp));
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args.firstblock = args.fsbno;
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xfs_rmap_ag_owner(&args.oinfo, XFS_RMAP_OWN_REFC);
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args.minlen = args.maxlen = args.prod = 1;
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args.resv = XFS_AG_RESV_METADATA;
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error = xfs_alloc_vextent(&args);
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if (error)
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goto out_error;
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trace_xfs_refcountbt_alloc_block(cur->bc_mp, cur->bc_private.a.agno,
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args.agbno, 1);
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if (args.fsbno == NULLFSBLOCK) {
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XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
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*stat = 0;
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return 0;
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}
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ASSERT(args.agno == cur->bc_private.a.agno);
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ASSERT(args.len == 1);
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new->s = cpu_to_be32(args.agbno);
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be32_add_cpu(&agf->agf_refcount_blocks, 1);
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xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
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XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
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*stat = 1;
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return 0;
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out_error:
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XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
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return error;
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}
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STATIC int
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xfs_refcountbt_free_block(
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struct xfs_btree_cur *cur,
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = cur->bc_mp;
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struct xfs_buf *agbp = cur->bc_private.a.agbp;
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struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
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xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
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struct xfs_owner_info oinfo;
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int error;
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trace_xfs_refcountbt_free_block(cur->bc_mp, cur->bc_private.a.agno,
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XFS_FSB_TO_AGBNO(cur->bc_mp, fsbno), 1);
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xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_REFC);
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be32_add_cpu(&agf->agf_refcount_blocks, -1);
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xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
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error = xfs_free_extent(cur->bc_tp, fsbno, 1, &oinfo,
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XFS_AG_RESV_METADATA);
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if (error)
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return error;
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return error;
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}
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STATIC int
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xfs_refcountbt_get_minrecs(
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struct xfs_btree_cur *cur,
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int level)
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{
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return cur->bc_mp->m_refc_mnr[level != 0];
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}
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STATIC int
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xfs_refcountbt_get_maxrecs(
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struct xfs_btree_cur *cur,
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int level)
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{
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return cur->bc_mp->m_refc_mxr[level != 0];
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}
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STATIC void
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xfs_refcountbt_init_key_from_rec(
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union xfs_btree_key *key,
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union xfs_btree_rec *rec)
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{
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key->refc.rc_startblock = rec->refc.rc_startblock;
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}
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STATIC void
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xfs_refcountbt_init_high_key_from_rec(
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union xfs_btree_key *key,
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union xfs_btree_rec *rec)
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{
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__u32 x;
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x = be32_to_cpu(rec->refc.rc_startblock);
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x += be32_to_cpu(rec->refc.rc_blockcount) - 1;
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key->refc.rc_startblock = cpu_to_be32(x);
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}
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STATIC void
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xfs_refcountbt_init_rec_from_cur(
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struct xfs_btree_cur *cur,
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union xfs_btree_rec *rec)
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{
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rec->refc.rc_startblock = cpu_to_be32(cur->bc_rec.rc.rc_startblock);
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rec->refc.rc_blockcount = cpu_to_be32(cur->bc_rec.rc.rc_blockcount);
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rec->refc.rc_refcount = cpu_to_be32(cur->bc_rec.rc.rc_refcount);
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}
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STATIC void
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xfs_refcountbt_init_ptr_from_cur(
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struct xfs_btree_cur *cur,
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union xfs_btree_ptr *ptr)
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{
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struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
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ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
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ASSERT(agf->agf_refcount_root != 0);
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ptr->s = agf->agf_refcount_root;
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}
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STATIC int64_t
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xfs_refcountbt_key_diff(
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struct xfs_btree_cur *cur,
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union xfs_btree_key *key)
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{
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struct xfs_refcount_irec *rec = &cur->bc_rec.rc;
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struct xfs_refcount_key *kp = &key->refc;
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return (int64_t)be32_to_cpu(kp->rc_startblock) - rec->rc_startblock;
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}
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STATIC int64_t
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xfs_refcountbt_diff_two_keys(
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struct xfs_btree_cur *cur,
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union xfs_btree_key *k1,
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union xfs_btree_key *k2)
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{
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return (int64_t)be32_to_cpu(k1->refc.rc_startblock) -
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be32_to_cpu(k2->refc.rc_startblock);
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}
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STATIC xfs_failaddr_t
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xfs_refcountbt_verify(
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struct xfs_buf *bp)
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{
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struct xfs_mount *mp = bp->b_target->bt_mount;
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struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
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struct xfs_perag *pag = bp->b_pag;
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xfs_failaddr_t fa;
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unsigned int level;
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if (block->bb_magic != cpu_to_be32(XFS_REFC_CRC_MAGIC))
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return __this_address;
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if (!xfs_sb_version_hasreflink(&mp->m_sb))
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return __this_address;
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fa = xfs_btree_sblock_v5hdr_verify(bp);
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if (fa)
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return fa;
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level = be16_to_cpu(block->bb_level);
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if (pag && pag->pagf_init) {
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if (level >= pag->pagf_refcount_level)
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return __this_address;
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} else if (level >= mp->m_refc_maxlevels)
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return __this_address;
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return xfs_btree_sblock_verify(bp, mp->m_refc_mxr[level != 0]);
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}
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STATIC void
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xfs_refcountbt_read_verify(
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struct xfs_buf *bp)
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{
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xfs_failaddr_t fa;
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if (!xfs_btree_sblock_verify_crc(bp))
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xfs_verifier_error(bp, -EFSBADCRC, __this_address);
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else {
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fa = xfs_refcountbt_verify(bp);
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if (fa)
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xfs_verifier_error(bp, -EFSCORRUPTED, fa);
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}
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if (bp->b_error)
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trace_xfs_btree_corrupt(bp, _RET_IP_);
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}
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STATIC void
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xfs_refcountbt_write_verify(
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struct xfs_buf *bp)
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{
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xfs_failaddr_t fa;
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fa = xfs_refcountbt_verify(bp);
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if (fa) {
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trace_xfs_btree_corrupt(bp, _RET_IP_);
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xfs_verifier_error(bp, -EFSCORRUPTED, fa);
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return;
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}
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xfs_btree_sblock_calc_crc(bp);
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}
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const struct xfs_buf_ops xfs_refcountbt_buf_ops = {
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.name = "xfs_refcountbt",
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.verify_read = xfs_refcountbt_read_verify,
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.verify_write = xfs_refcountbt_write_verify,
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.verify_struct = xfs_refcountbt_verify,
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};
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STATIC int
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xfs_refcountbt_keys_inorder(
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struct xfs_btree_cur *cur,
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union xfs_btree_key *k1,
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union xfs_btree_key *k2)
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{
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return be32_to_cpu(k1->refc.rc_startblock) <
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be32_to_cpu(k2->refc.rc_startblock);
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}
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STATIC int
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xfs_refcountbt_recs_inorder(
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struct xfs_btree_cur *cur,
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union xfs_btree_rec *r1,
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union xfs_btree_rec *r2)
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{
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return be32_to_cpu(r1->refc.rc_startblock) +
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be32_to_cpu(r1->refc.rc_blockcount) <=
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be32_to_cpu(r2->refc.rc_startblock);
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}
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static const struct xfs_btree_ops xfs_refcountbt_ops = {
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.rec_len = sizeof(struct xfs_refcount_rec),
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.key_len = sizeof(struct xfs_refcount_key),
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.dup_cursor = xfs_refcountbt_dup_cursor,
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.set_root = xfs_refcountbt_set_root,
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.alloc_block = xfs_refcountbt_alloc_block,
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.free_block = xfs_refcountbt_free_block,
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.get_minrecs = xfs_refcountbt_get_minrecs,
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.get_maxrecs = xfs_refcountbt_get_maxrecs,
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.init_key_from_rec = xfs_refcountbt_init_key_from_rec,
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.init_high_key_from_rec = xfs_refcountbt_init_high_key_from_rec,
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.init_rec_from_cur = xfs_refcountbt_init_rec_from_cur,
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.init_ptr_from_cur = xfs_refcountbt_init_ptr_from_cur,
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.key_diff = xfs_refcountbt_key_diff,
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.buf_ops = &xfs_refcountbt_buf_ops,
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.diff_two_keys = xfs_refcountbt_diff_two_keys,
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.keys_inorder = xfs_refcountbt_keys_inorder,
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.recs_inorder = xfs_refcountbt_recs_inorder,
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};
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/*
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* Allocate a new refcount btree cursor.
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*/
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struct xfs_btree_cur *
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xfs_refcountbt_init_cursor(
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struct xfs_mount *mp,
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struct xfs_trans *tp,
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struct xfs_buf *agbp,
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xfs_agnumber_t agno,
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struct xfs_defer_ops *dfops)
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{
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struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
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struct xfs_btree_cur *cur;
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ASSERT(agno != NULLAGNUMBER);
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ASSERT(agno < mp->m_sb.sb_agcount);
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cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS);
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cur->bc_tp = tp;
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cur->bc_mp = mp;
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cur->bc_btnum = XFS_BTNUM_REFC;
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cur->bc_blocklog = mp->m_sb.sb_blocklog;
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cur->bc_ops = &xfs_refcountbt_ops;
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cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_refcbt_2);
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cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level);
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cur->bc_private.a.agbp = agbp;
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cur->bc_private.a.agno = agno;
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cur->bc_private.a.dfops = dfops;
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cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
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cur->bc_private.a.priv.refc.nr_ops = 0;
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cur->bc_private.a.priv.refc.shape_changes = 0;
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return cur;
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}
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/*
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* Calculate the number of records in a refcount btree block.
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*/
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int
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xfs_refcountbt_maxrecs(
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struct xfs_mount *mp,
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int blocklen,
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bool leaf)
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{
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blocklen -= XFS_REFCOUNT_BLOCK_LEN;
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if (leaf)
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return blocklen / sizeof(struct xfs_refcount_rec);
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return blocklen / (sizeof(struct xfs_refcount_key) +
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sizeof(xfs_refcount_ptr_t));
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}
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/* Compute the maximum height of a refcount btree. */
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void
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xfs_refcountbt_compute_maxlevels(
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struct xfs_mount *mp)
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{
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mp->m_refc_maxlevels = xfs_btree_compute_maxlevels(mp,
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mp->m_refc_mnr, mp->m_sb.sb_agblocks);
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}
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/* Calculate the refcount btree size for some records. */
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xfs_extlen_t
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xfs_refcountbt_calc_size(
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struct xfs_mount *mp,
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unsigned long long len)
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{
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return xfs_btree_calc_size(mp, mp->m_refc_mnr, len);
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}
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/*
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* Calculate the maximum refcount btree size.
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*/
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xfs_extlen_t
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xfs_refcountbt_max_size(
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struct xfs_mount *mp,
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xfs_agblock_t agblocks)
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{
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/* Bail out if we're uninitialized, which can happen in mkfs. */
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if (mp->m_refc_mxr[0] == 0)
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return 0;
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return xfs_refcountbt_calc_size(mp, agblocks);
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}
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/*
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* Figure out how many blocks to reserve and how many are used by this btree.
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*/
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int
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xfs_refcountbt_calc_reserves(
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struct xfs_mount *mp,
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xfs_agnumber_t agno,
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xfs_extlen_t *ask,
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xfs_extlen_t *used)
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{
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struct xfs_buf *agbp;
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struct xfs_agf *agf;
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xfs_agblock_t agblocks;
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xfs_extlen_t tree_len;
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int error;
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if (!xfs_sb_version_hasreflink(&mp->m_sb))
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return 0;
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error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
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if (error)
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return error;
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agf = XFS_BUF_TO_AGF(agbp);
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agblocks = be32_to_cpu(agf->agf_length);
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tree_len = be32_to_cpu(agf->agf_refcount_blocks);
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xfs_buf_relse(agbp);
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*ask += xfs_refcountbt_max_size(mp, agblocks);
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*used += tree_len;
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return error;
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}
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