504 lines
13 KiB
C
504 lines
13 KiB
C
/*
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* Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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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 as
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* published by the Free Software Foundation.
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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_ag.h"
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#include "xfs_mount.h"
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#include "xfs_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_alloc.h"
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#include "xfs_extent_busy.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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STATIC struct xfs_btree_cur *
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xfs_allocbt_dup_cursor(
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struct xfs_btree_cur *cur)
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{
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return xfs_allocbt_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_btnum);
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}
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STATIC void
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xfs_allocbt_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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int btnum = cur->bc_btnum;
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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_roots[btnum] = ptr->s;
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be32_add_cpu(&agf->agf_levels[btnum], inc);
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pag->pagf_levels[btnum] += inc;
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xfs_perag_put(pag);
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xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS);
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}
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STATIC int
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xfs_allocbt_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 length,
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int *stat)
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{
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int error;
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xfs_agblock_t bno;
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XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
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/* Allocate the new block from the freelist. If we can't, give up. */
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error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp,
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&bno, 1);
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if (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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if (bno == NULLAGBLOCK) {
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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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xfs_extent_busy_reuse(cur->bc_mp, cur->bc_private.a.agno, bno, 1, false);
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xfs_trans_agbtree_delta(cur->bc_tp, 1);
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new->s = cpu_to_be32(bno);
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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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}
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STATIC int
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xfs_allocbt_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_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_agblock_t bno;
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int error;
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bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp));
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error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1);
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if (error)
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return error;
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xfs_extent_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1,
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XFS_EXTENT_BUSY_SKIP_DISCARD);
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xfs_trans_agbtree_delta(cur->bc_tp, -1);
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xfs_trans_binval(cur->bc_tp, bp);
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return 0;
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}
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/*
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* Update the longest extent in the AGF
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*/
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STATIC void
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xfs_allocbt_update_lastrec(
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struct xfs_btree_cur *cur,
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struct xfs_btree_block *block,
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union xfs_btree_rec *rec,
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int ptr,
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int reason)
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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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xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
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struct xfs_perag *pag;
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__be32 len;
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int numrecs;
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ASSERT(cur->bc_btnum == XFS_BTNUM_CNT);
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switch (reason) {
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case LASTREC_UPDATE:
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/*
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* If this is the last leaf block and it's the last record,
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* then update the size of the longest extent in the AG.
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*/
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if (ptr != xfs_btree_get_numrecs(block))
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return;
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len = rec->alloc.ar_blockcount;
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break;
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case LASTREC_INSREC:
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if (be32_to_cpu(rec->alloc.ar_blockcount) <=
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be32_to_cpu(agf->agf_longest))
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return;
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len = rec->alloc.ar_blockcount;
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break;
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case LASTREC_DELREC:
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numrecs = xfs_btree_get_numrecs(block);
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if (ptr <= numrecs)
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return;
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ASSERT(ptr == numrecs + 1);
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if (numrecs) {
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xfs_alloc_rec_t *rrp;
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rrp = XFS_ALLOC_REC_ADDR(cur->bc_mp, block, numrecs);
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len = rrp->ar_blockcount;
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} else {
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len = 0;
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}
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break;
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default:
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ASSERT(0);
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return;
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}
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agf->agf_longest = len;
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pag = xfs_perag_get(cur->bc_mp, seqno);
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pag->pagf_longest = be32_to_cpu(len);
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xfs_perag_put(pag);
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xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST);
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}
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STATIC int
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xfs_allocbt_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_alloc_mnr[level != 0];
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}
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STATIC int
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xfs_allocbt_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_alloc_mxr[level != 0];
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}
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STATIC void
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xfs_allocbt_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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ASSERT(rec->alloc.ar_startblock != 0);
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key->alloc.ar_startblock = rec->alloc.ar_startblock;
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key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
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}
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STATIC void
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xfs_allocbt_init_rec_from_key(
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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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ASSERT(key->alloc.ar_startblock != 0);
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rec->alloc.ar_startblock = key->alloc.ar_startblock;
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rec->alloc.ar_blockcount = key->alloc.ar_blockcount;
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}
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STATIC void
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xfs_allocbt_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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ASSERT(cur->bc_rec.a.ar_startblock != 0);
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rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock);
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rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount);
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}
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STATIC void
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xfs_allocbt_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_roots[cur->bc_btnum] != 0);
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ptr->s = agf->agf_roots[cur->bc_btnum];
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}
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STATIC __int64_t
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xfs_allocbt_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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xfs_alloc_rec_incore_t *rec = &cur->bc_rec.a;
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xfs_alloc_key_t *kp = &key->alloc;
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__int64_t diff;
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if (cur->bc_btnum == XFS_BTNUM_BNO) {
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return (__int64_t)be32_to_cpu(kp->ar_startblock) -
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rec->ar_startblock;
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}
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diff = (__int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount;
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if (diff)
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return diff;
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return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
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}
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static bool
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xfs_allocbt_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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unsigned int level;
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/*
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* magic number and level verification
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*
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* During growfs operations, we can't verify the exact level or owner as
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* the perag is not fully initialised and hence not attached to the
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* buffer. In this case, check against the maximum tree depth.
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*
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* Similarly, during log recovery we will have a perag structure
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* attached, but the agf information will not yet have been initialised
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* from the on disk AGF. Again, we can only check against maximum limits
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* in this case.
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*/
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level = be16_to_cpu(block->bb_level);
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switch (block->bb_magic) {
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case cpu_to_be32(XFS_ABTB_CRC_MAGIC):
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return false;
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if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_uuid))
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return false;
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if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
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return false;
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if (pag &&
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be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno)
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return false;
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/* fall through */
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case cpu_to_be32(XFS_ABTB_MAGIC):
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if (pag && pag->pagf_init) {
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if (level >= pag->pagf_levels[XFS_BTNUM_BNOi])
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return false;
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} else if (level >= mp->m_ag_maxlevels)
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return false;
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break;
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case cpu_to_be32(XFS_ABTC_CRC_MAGIC):
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if (!xfs_sb_version_hascrc(&mp->m_sb))
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return false;
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if (!uuid_equal(&block->bb_u.s.bb_uuid, &mp->m_sb.sb_uuid))
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return false;
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if (block->bb_u.s.bb_blkno != cpu_to_be64(bp->b_bn))
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return false;
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if (pag &&
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be32_to_cpu(block->bb_u.s.bb_owner) != pag->pag_agno)
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return false;
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/* fall through */
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case cpu_to_be32(XFS_ABTC_MAGIC):
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if (pag && pag->pagf_init) {
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if (level >= pag->pagf_levels[XFS_BTNUM_CNTi])
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return false;
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} else if (level >= mp->m_ag_maxlevels)
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return false;
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break;
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default:
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return false;
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}
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/* numrecs verification */
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if (be16_to_cpu(block->bb_numrecs) > mp->m_alloc_mxr[level != 0])
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return false;
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/* sibling pointer verification */
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if (!block->bb_u.s.bb_leftsib ||
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(be32_to_cpu(block->bb_u.s.bb_leftsib) >= mp->m_sb.sb_agblocks &&
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block->bb_u.s.bb_leftsib != cpu_to_be32(NULLAGBLOCK)))
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return false;
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if (!block->bb_u.s.bb_rightsib ||
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(be32_to_cpu(block->bb_u.s.bb_rightsib) >= mp->m_sb.sb_agblocks &&
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block->bb_u.s.bb_rightsib != cpu_to_be32(NULLAGBLOCK)))
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return false;
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return true;
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}
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static void
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xfs_allocbt_read_verify(
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struct xfs_buf *bp)
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{
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if (!(xfs_btree_sblock_verify_crc(bp) &&
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xfs_allocbt_verify(bp))) {
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trace_xfs_btree_corrupt(bp, _RET_IP_);
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW,
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bp->b_target->bt_mount, bp->b_addr);
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xfs_buf_ioerror(bp, EFSCORRUPTED);
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}
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}
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static void
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xfs_allocbt_write_verify(
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struct xfs_buf *bp)
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{
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if (!xfs_allocbt_verify(bp)) {
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trace_xfs_btree_corrupt(bp, _RET_IP_);
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW,
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bp->b_target->bt_mount, bp->b_addr);
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xfs_buf_ioerror(bp, EFSCORRUPTED);
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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_allocbt_buf_ops = {
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.verify_read = xfs_allocbt_read_verify,
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.verify_write = xfs_allocbt_write_verify,
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};
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#if defined(DEBUG) || defined(XFS_WARN)
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STATIC int
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xfs_allocbt_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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if (cur->bc_btnum == XFS_BTNUM_BNO) {
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return be32_to_cpu(k1->alloc.ar_startblock) <
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be32_to_cpu(k2->alloc.ar_startblock);
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} else {
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return be32_to_cpu(k1->alloc.ar_blockcount) <
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be32_to_cpu(k2->alloc.ar_blockcount) ||
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(k1->alloc.ar_blockcount == k2->alloc.ar_blockcount &&
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be32_to_cpu(k1->alloc.ar_startblock) <
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be32_to_cpu(k2->alloc.ar_startblock));
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}
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}
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STATIC int
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xfs_allocbt_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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if (cur->bc_btnum == XFS_BTNUM_BNO) {
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return be32_to_cpu(r1->alloc.ar_startblock) +
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be32_to_cpu(r1->alloc.ar_blockcount) <=
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be32_to_cpu(r2->alloc.ar_startblock);
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} else {
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return be32_to_cpu(r1->alloc.ar_blockcount) <
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be32_to_cpu(r2->alloc.ar_blockcount) ||
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(r1->alloc.ar_blockcount == r2->alloc.ar_blockcount &&
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be32_to_cpu(r1->alloc.ar_startblock) <
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be32_to_cpu(r2->alloc.ar_startblock));
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}
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}
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#endif /* DEBUG */
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static const struct xfs_btree_ops xfs_allocbt_ops = {
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.rec_len = sizeof(xfs_alloc_rec_t),
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.key_len = sizeof(xfs_alloc_key_t),
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.dup_cursor = xfs_allocbt_dup_cursor,
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.set_root = xfs_allocbt_set_root,
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.alloc_block = xfs_allocbt_alloc_block,
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.free_block = xfs_allocbt_free_block,
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.update_lastrec = xfs_allocbt_update_lastrec,
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.get_minrecs = xfs_allocbt_get_minrecs,
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.get_maxrecs = xfs_allocbt_get_maxrecs,
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.init_key_from_rec = xfs_allocbt_init_key_from_rec,
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.init_rec_from_key = xfs_allocbt_init_rec_from_key,
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.init_rec_from_cur = xfs_allocbt_init_rec_from_cur,
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.init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur,
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.key_diff = xfs_allocbt_key_diff,
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.buf_ops = &xfs_allocbt_buf_ops,
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#if defined(DEBUG) || defined(XFS_WARN)
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.keys_inorder = xfs_allocbt_keys_inorder,
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.recs_inorder = xfs_allocbt_recs_inorder,
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#endif
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};
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/*
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* Allocate a new allocation btree cursor.
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*/
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struct xfs_btree_cur * /* new alloc btree cursor */
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xfs_allocbt_init_cursor(
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struct xfs_mount *mp, /* file system mount point */
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struct xfs_trans *tp, /* transaction pointer */
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struct xfs_buf *agbp, /* buffer for agf structure */
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xfs_agnumber_t agno, /* allocation group number */
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xfs_btnum_t btnum) /* btree identifier */
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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(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT);
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cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
|
|
|
|
cur->bc_tp = tp;
|
|
cur->bc_mp = mp;
|
|
cur->bc_btnum = btnum;
|
|
cur->bc_blocklog = mp->m_sb.sb_blocklog;
|
|
cur->bc_ops = &xfs_allocbt_ops;
|
|
|
|
if (btnum == XFS_BTNUM_CNT) {
|
|
cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]);
|
|
cur->bc_flags = XFS_BTREE_LASTREC_UPDATE;
|
|
} else {
|
|
cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNO]);
|
|
}
|
|
|
|
cur->bc_private.a.agbp = agbp;
|
|
cur->bc_private.a.agno = agno;
|
|
|
|
if (xfs_sb_version_hascrc(&mp->m_sb))
|
|
cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
|
|
|
|
return cur;
|
|
}
|
|
|
|
/*
|
|
* Calculate number of records in an alloc btree block.
|
|
*/
|
|
int
|
|
xfs_allocbt_maxrecs(
|
|
struct xfs_mount *mp,
|
|
int blocklen,
|
|
int leaf)
|
|
{
|
|
blocklen -= XFS_ALLOC_BLOCK_LEN(mp);
|
|
|
|
if (leaf)
|
|
return blocklen / sizeof(xfs_alloc_rec_t);
|
|
return blocklen / (sizeof(xfs_alloc_key_t) + sizeof(xfs_alloc_ptr_t));
|
|
}
|