493 lines
12 KiB
C
493 lines
12 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_bit.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_btree.h"
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#include "xfs_ialloc.h"
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#include "xfs_ialloc_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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STATIC int
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xfs_inobt_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_inobt_mnr[level != 0];
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}
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STATIC struct xfs_btree_cur *
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xfs_inobt_dup_cursor(
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struct xfs_btree_cur *cur)
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{
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return xfs_inobt_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_inobt_set_root(
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struct xfs_btree_cur *cur,
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union xfs_btree_ptr *nptr,
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int inc) /* level change */
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{
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struct xfs_buf *agbp = cur->bc_private.a.agbp;
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struct xfs_agi *agi = XFS_BUF_TO_AGI(agbp);
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agi->agi_root = nptr->s;
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be32_add_cpu(&agi->agi_level, inc);
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xfs_ialloc_log_agi(cur->bc_tp, agbp, XFS_AGI_ROOT | XFS_AGI_LEVEL);
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}
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STATIC void
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xfs_finobt_set_root(
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struct xfs_btree_cur *cur,
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union xfs_btree_ptr *nptr,
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int inc) /* level change */
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{
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struct xfs_buf *agbp = cur->bc_private.a.agbp;
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struct xfs_agi *agi = XFS_BUF_TO_AGI(agbp);
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agi->agi_free_root = nptr->s;
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be32_add_cpu(&agi->agi_free_level, inc);
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xfs_ialloc_log_agi(cur->bc_tp, agbp,
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XFS_AGI_FREE_ROOT | XFS_AGI_FREE_LEVEL);
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}
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STATIC int
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xfs_inobt_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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xfs_alloc_arg_t args; /* block allocation args */
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int error; /* error return value */
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xfs_agblock_t sbno = be32_to_cpu(start->s);
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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.fsbno = XFS_AGB_TO_FSB(args.mp, cur->bc_private.a.agno, sbno);
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args.minlen = 1;
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args.maxlen = 1;
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args.prod = 1;
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args.type = XFS_ALLOCTYPE_NEAR_BNO;
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error = xfs_alloc_vextent(&args);
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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 (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.len == 1);
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XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
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new->s = cpu_to_be32(XFS_FSB_TO_AGBNO(args.mp, args.fsbno));
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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_inobt_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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xfs_fsblock_t fsbno;
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int error;
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fsbno = XFS_DADDR_TO_FSB(cur->bc_mp, XFS_BUF_ADDR(bp));
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error = xfs_free_extent(cur->bc_tp, fsbno, 1);
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if (error)
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return error;
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xfs_trans_binval(cur->bc_tp, bp);
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return error;
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}
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STATIC int
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xfs_inobt_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_inobt_mxr[level != 0];
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}
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STATIC void
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xfs_inobt_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->inobt.ir_startino = rec->inobt.ir_startino;
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}
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STATIC void
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xfs_inobt_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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rec->inobt.ir_startino = key->inobt.ir_startino;
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}
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STATIC void
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xfs_inobt_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->inobt.ir_startino = cpu_to_be32(cur->bc_rec.i.ir_startino);
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if (xfs_sb_version_hassparseinodes(&cur->bc_mp->m_sb)) {
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rec->inobt.ir_u.sp.ir_holemask =
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cpu_to_be16(cur->bc_rec.i.ir_holemask);
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rec->inobt.ir_u.sp.ir_count = cur->bc_rec.i.ir_count;
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rec->inobt.ir_u.sp.ir_freecount = cur->bc_rec.i.ir_freecount;
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} else {
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/* ir_holemask/ir_count not supported on-disk */
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rec->inobt.ir_u.f.ir_freecount =
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cpu_to_be32(cur->bc_rec.i.ir_freecount);
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}
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rec->inobt.ir_free = cpu_to_be64(cur->bc_rec.i.ir_free);
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}
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/*
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* initial value of ptr for lookup
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*/
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STATIC void
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xfs_inobt_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_agi *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
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ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno));
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ptr->s = agi->agi_root;
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}
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STATIC void
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xfs_finobt_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_agi *agi = XFS_BUF_TO_AGI(cur->bc_private.a.agbp);
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ASSERT(cur->bc_private.a.agno == be32_to_cpu(agi->agi_seqno));
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ptr->s = agi->agi_free_root;
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}
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STATIC __int64_t
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xfs_inobt_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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return (__int64_t)be32_to_cpu(key->inobt.ir_startino) -
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cur->bc_rec.i.ir_startino;
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}
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static int
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xfs_inobt_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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unsigned int level;
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/*
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* During growfs operations, we can't verify the exact owner as the
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* perag is not fully initialised and hence not attached to the buffer.
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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 agi information will not yet have been initialised
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* from the on disk AGI. We don't currently use any of this information,
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* but beware of the landmine (i.e. need to check pag->pagi_init) if we
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* ever do.
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*/
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switch (block->bb_magic) {
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case cpu_to_be32(XFS_IBT_CRC_MAGIC):
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case cpu_to_be32(XFS_FIBT_CRC_MAGIC):
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if (!xfs_btree_sblock_v5hdr_verify(bp))
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return false;
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/* fall through */
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case cpu_to_be32(XFS_IBT_MAGIC):
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case cpu_to_be32(XFS_FIBT_MAGIC):
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break;
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default:
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return 0;
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}
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/* level verification */
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level = be16_to_cpu(block->bb_level);
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if (level >= mp->m_in_maxlevels)
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return false;
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return xfs_btree_sblock_verify(bp, mp->m_inobt_mxr[level != 0]);
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}
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static void
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xfs_inobt_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_buf_ioerror(bp, -EFSBADCRC);
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else if (!xfs_inobt_verify(bp))
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xfs_buf_ioerror(bp, -EFSCORRUPTED);
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if (bp->b_error) {
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trace_xfs_btree_corrupt(bp, _RET_IP_);
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xfs_verifier_error(bp);
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}
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}
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static void
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xfs_inobt_write_verify(
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struct xfs_buf *bp)
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{
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if (!xfs_inobt_verify(bp)) {
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trace_xfs_btree_corrupt(bp, _RET_IP_);
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xfs_buf_ioerror(bp, -EFSCORRUPTED);
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xfs_verifier_error(bp);
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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_inobt_buf_ops = {
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.name = "xfs_inobt",
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.verify_read = xfs_inobt_read_verify,
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.verify_write = xfs_inobt_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_inobt_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->inobt.ir_startino) <
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be32_to_cpu(k2->inobt.ir_startino);
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}
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STATIC int
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xfs_inobt_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->inobt.ir_startino) + XFS_INODES_PER_CHUNK <=
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be32_to_cpu(r2->inobt.ir_startino);
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}
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#endif /* DEBUG */
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static const struct xfs_btree_ops xfs_inobt_ops = {
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.rec_len = sizeof(xfs_inobt_rec_t),
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.key_len = sizeof(xfs_inobt_key_t),
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.dup_cursor = xfs_inobt_dup_cursor,
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.set_root = xfs_inobt_set_root,
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.alloc_block = xfs_inobt_alloc_block,
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.free_block = xfs_inobt_free_block,
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.get_minrecs = xfs_inobt_get_minrecs,
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.get_maxrecs = xfs_inobt_get_maxrecs,
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.init_key_from_rec = xfs_inobt_init_key_from_rec,
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.init_rec_from_key = xfs_inobt_init_rec_from_key,
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.init_rec_from_cur = xfs_inobt_init_rec_from_cur,
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.init_ptr_from_cur = xfs_inobt_init_ptr_from_cur,
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.key_diff = xfs_inobt_key_diff,
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.buf_ops = &xfs_inobt_buf_ops,
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#if defined(DEBUG) || defined(XFS_WARN)
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.keys_inorder = xfs_inobt_keys_inorder,
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.recs_inorder = xfs_inobt_recs_inorder,
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#endif
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};
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static const struct xfs_btree_ops xfs_finobt_ops = {
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.rec_len = sizeof(xfs_inobt_rec_t),
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.key_len = sizeof(xfs_inobt_key_t),
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.dup_cursor = xfs_inobt_dup_cursor,
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.set_root = xfs_finobt_set_root,
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.alloc_block = xfs_inobt_alloc_block,
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.free_block = xfs_inobt_free_block,
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.get_minrecs = xfs_inobt_get_minrecs,
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.get_maxrecs = xfs_inobt_get_maxrecs,
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.init_key_from_rec = xfs_inobt_init_key_from_rec,
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.init_rec_from_key = xfs_inobt_init_rec_from_key,
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.init_rec_from_cur = xfs_inobt_init_rec_from_cur,
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.init_ptr_from_cur = xfs_finobt_init_ptr_from_cur,
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.key_diff = xfs_inobt_key_diff,
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.buf_ops = &xfs_inobt_buf_ops,
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#if defined(DEBUG) || defined(XFS_WARN)
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.keys_inorder = xfs_inobt_keys_inorder,
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.recs_inorder = xfs_inobt_recs_inorder,
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#endif
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};
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/*
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* Allocate a new inode btree cursor.
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*/
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struct xfs_btree_cur * /* new inode btree cursor */
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xfs_inobt_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 agi structure */
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xfs_agnumber_t agno, /* allocation group number */
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xfs_btnum_t btnum) /* ialloc or free ino btree */
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{
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struct xfs_agi *agi = XFS_BUF_TO_AGI(agbp);
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struct xfs_btree_cur *cur;
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cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
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cur->bc_tp = tp;
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cur->bc_mp = mp;
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cur->bc_btnum = btnum;
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if (btnum == XFS_BTNUM_INO) {
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cur->bc_nlevels = be32_to_cpu(agi->agi_level);
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cur->bc_ops = &xfs_inobt_ops;
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} else {
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cur->bc_nlevels = be32_to_cpu(agi->agi_free_level);
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cur->bc_ops = &xfs_finobt_ops;
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}
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cur->bc_blocklog = mp->m_sb.sb_blocklog;
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if (xfs_sb_version_hascrc(&mp->m_sb))
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cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
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cur->bc_private.a.agbp = agbp;
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cur->bc_private.a.agno = agno;
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return cur;
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}
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/*
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* Calculate number of records in an inobt btree block.
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*/
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int
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xfs_inobt_maxrecs(
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struct xfs_mount *mp,
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int blocklen,
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int leaf)
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{
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blocklen -= XFS_INOBT_BLOCK_LEN(mp);
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if (leaf)
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return blocklen / sizeof(xfs_inobt_rec_t);
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return blocklen / (sizeof(xfs_inobt_key_t) + sizeof(xfs_inobt_ptr_t));
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}
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/*
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* Convert the inode record holemask to an inode allocation bitmap. The inode
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* allocation bitmap is inode granularity and specifies whether an inode is
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* physically allocated on disk (not whether the inode is considered allocated
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* or free by the fs).
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*
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* A bit value of 1 means the inode is allocated, a value of 0 means it is free.
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*/
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uint64_t
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xfs_inobt_irec_to_allocmask(
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struct xfs_inobt_rec_incore *rec)
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{
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uint64_t bitmap = 0;
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uint64_t inodespbit;
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int nextbit;
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uint allocbitmap;
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/*
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* The holemask has 16-bits for a 64 inode record. Therefore each
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* holemask bit represents multiple inodes. Create a mask of bits to set
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* in the allocmask for each holemask bit.
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*/
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inodespbit = (1 << XFS_INODES_PER_HOLEMASK_BIT) - 1;
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/*
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* Allocated inodes are represented by 0 bits in holemask. Invert the 0
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* bits to 1 and convert to a uint so we can use xfs_next_bit(). Mask
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* anything beyond the 16 holemask bits since this casts to a larger
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* type.
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*/
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allocbitmap = ~rec->ir_holemask & ((1 << XFS_INOBT_HOLEMASK_BITS) - 1);
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/*
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* allocbitmap is the inverted holemask so every set bit represents
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* allocated inodes. To expand from 16-bit holemask granularity to
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* 64-bit (e.g., bit-per-inode), set inodespbit bits in the target
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* bitmap for every holemask bit.
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*/
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nextbit = xfs_next_bit(&allocbitmap, 1, 0);
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while (nextbit != -1) {
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ASSERT(nextbit < (sizeof(rec->ir_holemask) * NBBY));
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bitmap |= (inodespbit <<
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(nextbit * XFS_INODES_PER_HOLEMASK_BIT));
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nextbit = xfs_next_bit(&allocbitmap, 1, nextbit + 1);
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}
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return bitmap;
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}
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#if defined(DEBUG) || defined(XFS_WARN)
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/*
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* Verify that an in-core inode record has a valid inode count.
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*/
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int
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xfs_inobt_rec_check_count(
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struct xfs_mount *mp,
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struct xfs_inobt_rec_incore *rec)
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{
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|
int inocount = 0;
|
|
int nextbit = 0;
|
|
uint64_t allocbmap;
|
|
int wordsz;
|
|
|
|
wordsz = sizeof(allocbmap) / sizeof(unsigned int);
|
|
allocbmap = xfs_inobt_irec_to_allocmask(rec);
|
|
|
|
nextbit = xfs_next_bit((uint *) &allocbmap, wordsz, nextbit);
|
|
while (nextbit != -1) {
|
|
inocount++;
|
|
nextbit = xfs_next_bit((uint *) &allocbmap, wordsz,
|
|
nextbit + 1);
|
|
}
|
|
|
|
if (inocount != rec->ir_count)
|
|
return -EFSCORRUPTED;
|
|
|
|
return 0;
|
|
}
|
|
#endif /* DEBUG */
|