![Darrick J. Wong](/assets/img/avatar_default.png)
Provide a function to convert an unwritten extent to a real one and vice versa when shared extents are possible. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2294 lines
62 KiB
C
2294 lines
62 KiB
C
/*
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* Copyright (c) 2014 Red Hat, 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_sb.h"
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#include "xfs_mount.h"
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#include "xfs_defer.h"
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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#include "xfs_btree.h"
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#include "xfs_trans.h"
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#include "xfs_alloc.h"
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#include "xfs_rmap.h"
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#include "xfs_rmap_btree.h"
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#include "xfs_trans_space.h"
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#include "xfs_trace.h"
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#include "xfs_error.h"
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#include "xfs_extent_busy.h"
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#include "xfs_bmap.h"
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#include "xfs_inode.h"
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/*
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* Lookup the first record less than or equal to [bno, len, owner, offset]
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* in the btree given by cur.
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*/
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int
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xfs_rmap_lookup_le(
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struct xfs_btree_cur *cur,
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xfs_agblock_t bno,
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xfs_extlen_t len,
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uint64_t owner,
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uint64_t offset,
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unsigned int flags,
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int *stat)
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{
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cur->bc_rec.r.rm_startblock = bno;
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cur->bc_rec.r.rm_blockcount = len;
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cur->bc_rec.r.rm_owner = owner;
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cur->bc_rec.r.rm_offset = offset;
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cur->bc_rec.r.rm_flags = flags;
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return xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat);
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}
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/*
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* Lookup the record exactly matching [bno, len, owner, offset]
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* in the btree given by cur.
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*/
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int
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xfs_rmap_lookup_eq(
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struct xfs_btree_cur *cur,
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xfs_agblock_t bno,
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xfs_extlen_t len,
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uint64_t owner,
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uint64_t offset,
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unsigned int flags,
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int *stat)
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{
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cur->bc_rec.r.rm_startblock = bno;
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cur->bc_rec.r.rm_blockcount = len;
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cur->bc_rec.r.rm_owner = owner;
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cur->bc_rec.r.rm_offset = offset;
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cur->bc_rec.r.rm_flags = flags;
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return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
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}
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/*
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* Update the record referred to by cur to the value given
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* by [bno, len, owner, offset].
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* This either works (return 0) or gets an EFSCORRUPTED error.
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*/
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STATIC int
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xfs_rmap_update(
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struct xfs_btree_cur *cur,
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struct xfs_rmap_irec *irec)
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{
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union xfs_btree_rec rec;
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int error;
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trace_xfs_rmap_update(cur->bc_mp, cur->bc_private.a.agno,
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irec->rm_startblock, irec->rm_blockcount,
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irec->rm_owner, irec->rm_offset, irec->rm_flags);
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rec.rmap.rm_startblock = cpu_to_be32(irec->rm_startblock);
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rec.rmap.rm_blockcount = cpu_to_be32(irec->rm_blockcount);
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rec.rmap.rm_owner = cpu_to_be64(irec->rm_owner);
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rec.rmap.rm_offset = cpu_to_be64(
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xfs_rmap_irec_offset_pack(irec));
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error = xfs_btree_update(cur, &rec);
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if (error)
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trace_xfs_rmap_update_error(cur->bc_mp,
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cur->bc_private.a.agno, error, _RET_IP_);
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return error;
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}
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int
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xfs_rmap_insert(
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struct xfs_btree_cur *rcur,
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xfs_agblock_t agbno,
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xfs_extlen_t len,
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uint64_t owner,
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uint64_t offset,
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unsigned int flags)
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{
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int i;
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int error;
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trace_xfs_rmap_insert(rcur->bc_mp, rcur->bc_private.a.agno, agbno,
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len, owner, offset, flags);
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error = xfs_rmap_lookup_eq(rcur, agbno, len, owner, offset, flags, &i);
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if (error)
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goto done;
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XFS_WANT_CORRUPTED_GOTO(rcur->bc_mp, i == 0, done);
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rcur->bc_rec.r.rm_startblock = agbno;
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rcur->bc_rec.r.rm_blockcount = len;
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rcur->bc_rec.r.rm_owner = owner;
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rcur->bc_rec.r.rm_offset = offset;
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rcur->bc_rec.r.rm_flags = flags;
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error = xfs_btree_insert(rcur, &i);
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if (error)
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goto done;
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XFS_WANT_CORRUPTED_GOTO(rcur->bc_mp, i == 1, done);
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done:
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if (error)
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trace_xfs_rmap_insert_error(rcur->bc_mp,
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rcur->bc_private.a.agno, error, _RET_IP_);
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return error;
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}
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STATIC int
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xfs_rmap_delete(
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struct xfs_btree_cur *rcur,
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xfs_agblock_t agbno,
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xfs_extlen_t len,
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uint64_t owner,
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uint64_t offset,
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unsigned int flags)
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{
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int i;
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int error;
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trace_xfs_rmap_delete(rcur->bc_mp, rcur->bc_private.a.agno, agbno,
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len, owner, offset, flags);
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error = xfs_rmap_lookup_eq(rcur, agbno, len, owner, offset, flags, &i);
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if (error)
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goto done;
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XFS_WANT_CORRUPTED_GOTO(rcur->bc_mp, i == 1, done);
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error = xfs_btree_delete(rcur, &i);
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if (error)
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goto done;
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XFS_WANT_CORRUPTED_GOTO(rcur->bc_mp, i == 1, done);
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done:
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if (error)
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trace_xfs_rmap_delete_error(rcur->bc_mp,
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rcur->bc_private.a.agno, error, _RET_IP_);
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return error;
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}
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static int
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xfs_rmap_btrec_to_irec(
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union xfs_btree_rec *rec,
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struct xfs_rmap_irec *irec)
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{
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irec->rm_flags = 0;
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irec->rm_startblock = be32_to_cpu(rec->rmap.rm_startblock);
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irec->rm_blockcount = be32_to_cpu(rec->rmap.rm_blockcount);
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irec->rm_owner = be64_to_cpu(rec->rmap.rm_owner);
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return xfs_rmap_irec_offset_unpack(be64_to_cpu(rec->rmap.rm_offset),
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irec);
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}
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/*
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* Get the data from the pointed-to record.
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*/
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int
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xfs_rmap_get_rec(
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struct xfs_btree_cur *cur,
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struct xfs_rmap_irec *irec,
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int *stat)
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{
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union xfs_btree_rec *rec;
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int error;
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error = xfs_btree_get_rec(cur, &rec, stat);
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if (error || !*stat)
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return error;
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return xfs_rmap_btrec_to_irec(rec, irec);
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}
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struct xfs_find_left_neighbor_info {
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struct xfs_rmap_irec high;
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struct xfs_rmap_irec *irec;
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int *stat;
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};
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/* For each rmap given, figure out if it matches the key we want. */
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STATIC int
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xfs_rmap_find_left_neighbor_helper(
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struct xfs_btree_cur *cur,
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struct xfs_rmap_irec *rec,
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void *priv)
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{
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struct xfs_find_left_neighbor_info *info = priv;
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trace_xfs_rmap_find_left_neighbor_candidate(cur->bc_mp,
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cur->bc_private.a.agno, rec->rm_startblock,
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rec->rm_blockcount, rec->rm_owner, rec->rm_offset,
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rec->rm_flags);
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if (rec->rm_owner != info->high.rm_owner)
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return XFS_BTREE_QUERY_RANGE_CONTINUE;
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if (!XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) &&
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!(rec->rm_flags & XFS_RMAP_BMBT_BLOCK) &&
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rec->rm_offset + rec->rm_blockcount - 1 != info->high.rm_offset)
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return XFS_BTREE_QUERY_RANGE_CONTINUE;
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*info->irec = *rec;
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*info->stat = 1;
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return XFS_BTREE_QUERY_RANGE_ABORT;
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}
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/*
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* Find the record to the left of the given extent, being careful only to
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* return a match with the same owner and adjacent physical and logical
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* block ranges.
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*/
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int
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xfs_rmap_find_left_neighbor(
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struct xfs_btree_cur *cur,
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xfs_agblock_t bno,
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uint64_t owner,
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uint64_t offset,
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unsigned int flags,
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struct xfs_rmap_irec *irec,
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int *stat)
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{
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struct xfs_find_left_neighbor_info info;
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int error;
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*stat = 0;
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if (bno == 0)
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return 0;
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info.high.rm_startblock = bno - 1;
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info.high.rm_owner = owner;
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if (!XFS_RMAP_NON_INODE_OWNER(owner) &&
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!(flags & XFS_RMAP_BMBT_BLOCK)) {
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if (offset == 0)
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return 0;
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info.high.rm_offset = offset - 1;
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} else
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info.high.rm_offset = 0;
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info.high.rm_flags = flags;
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info.high.rm_blockcount = 0;
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info.irec = irec;
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info.stat = stat;
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trace_xfs_rmap_find_left_neighbor_query(cur->bc_mp,
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cur->bc_private.a.agno, bno, 0, owner, offset, flags);
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error = xfs_rmap_query_range(cur, &info.high, &info.high,
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xfs_rmap_find_left_neighbor_helper, &info);
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if (error == XFS_BTREE_QUERY_RANGE_ABORT)
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error = 0;
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if (*stat)
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trace_xfs_rmap_find_left_neighbor_result(cur->bc_mp,
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cur->bc_private.a.agno, irec->rm_startblock,
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irec->rm_blockcount, irec->rm_owner,
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irec->rm_offset, irec->rm_flags);
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return error;
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}
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/* For each rmap given, figure out if it matches the key we want. */
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STATIC int
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xfs_rmap_lookup_le_range_helper(
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struct xfs_btree_cur *cur,
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struct xfs_rmap_irec *rec,
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void *priv)
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{
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struct xfs_find_left_neighbor_info *info = priv;
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trace_xfs_rmap_lookup_le_range_candidate(cur->bc_mp,
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cur->bc_private.a.agno, rec->rm_startblock,
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rec->rm_blockcount, rec->rm_owner, rec->rm_offset,
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rec->rm_flags);
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if (rec->rm_owner != info->high.rm_owner)
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return XFS_BTREE_QUERY_RANGE_CONTINUE;
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if (!XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) &&
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!(rec->rm_flags & XFS_RMAP_BMBT_BLOCK) &&
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(rec->rm_offset > info->high.rm_offset ||
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rec->rm_offset + rec->rm_blockcount <= info->high.rm_offset))
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return XFS_BTREE_QUERY_RANGE_CONTINUE;
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*info->irec = *rec;
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*info->stat = 1;
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return XFS_BTREE_QUERY_RANGE_ABORT;
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}
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/*
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* Find the record to the left of the given extent, being careful only to
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* return a match with the same owner and overlapping physical and logical
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* block ranges. This is the overlapping-interval version of
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* xfs_rmap_lookup_le.
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*/
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int
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xfs_rmap_lookup_le_range(
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struct xfs_btree_cur *cur,
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xfs_agblock_t bno,
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uint64_t owner,
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uint64_t offset,
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unsigned int flags,
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struct xfs_rmap_irec *irec,
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int *stat)
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{
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struct xfs_find_left_neighbor_info info;
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int error;
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info.high.rm_startblock = bno;
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info.high.rm_owner = owner;
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if (!XFS_RMAP_NON_INODE_OWNER(owner) && !(flags & XFS_RMAP_BMBT_BLOCK))
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info.high.rm_offset = offset;
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else
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info.high.rm_offset = 0;
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info.high.rm_flags = flags;
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info.high.rm_blockcount = 0;
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*stat = 0;
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info.irec = irec;
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info.stat = stat;
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trace_xfs_rmap_lookup_le_range(cur->bc_mp,
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cur->bc_private.a.agno, bno, 0, owner, offset, flags);
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error = xfs_rmap_query_range(cur, &info.high, &info.high,
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xfs_rmap_lookup_le_range_helper, &info);
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if (error == XFS_BTREE_QUERY_RANGE_ABORT)
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error = 0;
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if (*stat)
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trace_xfs_rmap_lookup_le_range_result(cur->bc_mp,
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cur->bc_private.a.agno, irec->rm_startblock,
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irec->rm_blockcount, irec->rm_owner,
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irec->rm_offset, irec->rm_flags);
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return error;
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}
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/*
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* Find the extent in the rmap btree and remove it.
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*
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* The record we find should always be an exact match for the extent that we're
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* looking for, since we insert them into the btree without modification.
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*
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* Special Case #1: when growing the filesystem, we "free" an extent when
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* growing the last AG. This extent is new space and so it is not tracked as
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* used space in the btree. The growfs code will pass in an owner of
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* XFS_RMAP_OWN_NULL to indicate that it expected that there is no owner of this
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* extent. We verify that - the extent lookup result in a record that does not
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* overlap.
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*
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* Special Case #2: EFIs do not record the owner of the extent, so when
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* recovering EFIs from the log we pass in XFS_RMAP_OWN_UNKNOWN to tell the rmap
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* btree to ignore the owner (i.e. wildcard match) so we don't trigger
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* corruption checks during log recovery.
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*/
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STATIC int
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xfs_rmap_unmap(
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struct xfs_btree_cur *cur,
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xfs_agblock_t bno,
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xfs_extlen_t len,
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bool unwritten,
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struct xfs_owner_info *oinfo)
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{
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struct xfs_mount *mp = cur->bc_mp;
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struct xfs_rmap_irec ltrec;
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uint64_t ltoff;
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int error = 0;
|
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int i;
|
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uint64_t owner;
|
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uint64_t offset;
|
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unsigned int flags;
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bool ignore_off;
|
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|
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xfs_owner_info_unpack(oinfo, &owner, &offset, &flags);
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ignore_off = XFS_RMAP_NON_INODE_OWNER(owner) ||
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(flags & XFS_RMAP_BMBT_BLOCK);
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if (unwritten)
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flags |= XFS_RMAP_UNWRITTEN;
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trace_xfs_rmap_unmap(mp, cur->bc_private.a.agno, bno, len,
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unwritten, oinfo);
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|
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/*
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* We should always have a left record because there's a static record
|
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* for the AG headers at rm_startblock == 0 created by mkfs/growfs that
|
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* will not ever be removed from the tree.
|
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*/
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error = xfs_rmap_lookup_le(cur, bno, len, owner, offset, flags, &i);
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if (error)
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goto out_error;
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XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error);
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|
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error = xfs_rmap_get_rec(cur, <rec, &i);
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if (error)
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goto out_error;
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XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error);
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trace_xfs_rmap_lookup_le_range_result(cur->bc_mp,
|
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cur->bc_private.a.agno, ltrec.rm_startblock,
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ltrec.rm_blockcount, ltrec.rm_owner,
|
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ltrec.rm_offset, ltrec.rm_flags);
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ltoff = ltrec.rm_offset;
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|
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/*
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* For growfs, the incoming extent must be beyond the left record we
|
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* just found as it is new space and won't be used by anyone. This is
|
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* just a corruption check as we don't actually do anything with this
|
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* extent. Note that we need to use >= instead of > because it might
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* be the case that the "left" extent goes all the way to EOFS.
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*/
|
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if (owner == XFS_RMAP_OWN_NULL) {
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XFS_WANT_CORRUPTED_GOTO(mp, bno >= ltrec.rm_startblock +
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ltrec.rm_blockcount, out_error);
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goto out_done;
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}
|
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|
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/* Make sure the unwritten flag matches. */
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XFS_WANT_CORRUPTED_GOTO(mp, (flags & XFS_RMAP_UNWRITTEN) ==
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(ltrec.rm_flags & XFS_RMAP_UNWRITTEN), out_error);
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|
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/* Make sure the extent we found covers the entire freeing range. */
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XFS_WANT_CORRUPTED_GOTO(mp, ltrec.rm_startblock <= bno &&
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ltrec.rm_startblock + ltrec.rm_blockcount >=
|
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bno + len, out_error);
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|
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/* Make sure the owner matches what we expect to find in the tree. */
|
|
XFS_WANT_CORRUPTED_GOTO(mp, owner == ltrec.rm_owner ||
|
|
XFS_RMAP_NON_INODE_OWNER(owner), out_error);
|
|
|
|
/* Check the offset, if necessary. */
|
|
if (!XFS_RMAP_NON_INODE_OWNER(owner)) {
|
|
if (flags & XFS_RMAP_BMBT_BLOCK) {
|
|
XFS_WANT_CORRUPTED_GOTO(mp,
|
|
ltrec.rm_flags & XFS_RMAP_BMBT_BLOCK,
|
|
out_error);
|
|
} else {
|
|
XFS_WANT_CORRUPTED_GOTO(mp,
|
|
ltrec.rm_offset <= offset, out_error);
|
|
XFS_WANT_CORRUPTED_GOTO(mp,
|
|
ltoff + ltrec.rm_blockcount >= offset + len,
|
|
out_error);
|
|
}
|
|
}
|
|
|
|
if (ltrec.rm_startblock == bno && ltrec.rm_blockcount == len) {
|
|
/* exact match, simply remove the record from rmap tree */
|
|
trace_xfs_rmap_delete(mp, cur->bc_private.a.agno,
|
|
ltrec.rm_startblock, ltrec.rm_blockcount,
|
|
ltrec.rm_owner, ltrec.rm_offset,
|
|
ltrec.rm_flags);
|
|
error = xfs_btree_delete(cur, &i);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error);
|
|
} else if (ltrec.rm_startblock == bno) {
|
|
/*
|
|
* overlap left hand side of extent: move the start, trim the
|
|
* length and update the current record.
|
|
*
|
|
* ltbno ltlen
|
|
* Orig: |oooooooooooooooooooo|
|
|
* Freeing: |fffffffff|
|
|
* Result: |rrrrrrrrrr|
|
|
* bno len
|
|
*/
|
|
ltrec.rm_startblock += len;
|
|
ltrec.rm_blockcount -= len;
|
|
if (!ignore_off)
|
|
ltrec.rm_offset += len;
|
|
error = xfs_rmap_update(cur, <rec);
|
|
if (error)
|
|
goto out_error;
|
|
} else if (ltrec.rm_startblock + ltrec.rm_blockcount == bno + len) {
|
|
/*
|
|
* overlap right hand side of extent: trim the length and update
|
|
* the current record.
|
|
*
|
|
* ltbno ltlen
|
|
* Orig: |oooooooooooooooooooo|
|
|
* Freeing: |fffffffff|
|
|
* Result: |rrrrrrrrrr|
|
|
* bno len
|
|
*/
|
|
ltrec.rm_blockcount -= len;
|
|
error = xfs_rmap_update(cur, <rec);
|
|
if (error)
|
|
goto out_error;
|
|
} else {
|
|
|
|
/*
|
|
* overlap middle of extent: trim the length of the existing
|
|
* record to the length of the new left-extent size, increment
|
|
* the insertion position so we can insert a new record
|
|
* containing the remaining right-extent space.
|
|
*
|
|
* ltbno ltlen
|
|
* Orig: |oooooooooooooooooooo|
|
|
* Freeing: |fffffffff|
|
|
* Result: |rrrrr| |rrrr|
|
|
* bno len
|
|
*/
|
|
xfs_extlen_t orig_len = ltrec.rm_blockcount;
|
|
|
|
ltrec.rm_blockcount = bno - ltrec.rm_startblock;
|
|
error = xfs_rmap_update(cur, <rec);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
error = xfs_btree_increment(cur, 0, &i);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
cur->bc_rec.r.rm_startblock = bno + len;
|
|
cur->bc_rec.r.rm_blockcount = orig_len - len -
|
|
ltrec.rm_blockcount;
|
|
cur->bc_rec.r.rm_owner = ltrec.rm_owner;
|
|
if (ignore_off)
|
|
cur->bc_rec.r.rm_offset = 0;
|
|
else
|
|
cur->bc_rec.r.rm_offset = offset + len;
|
|
cur->bc_rec.r.rm_flags = flags;
|
|
trace_xfs_rmap_insert(mp, cur->bc_private.a.agno,
|
|
cur->bc_rec.r.rm_startblock,
|
|
cur->bc_rec.r.rm_blockcount,
|
|
cur->bc_rec.r.rm_owner,
|
|
cur->bc_rec.r.rm_offset,
|
|
cur->bc_rec.r.rm_flags);
|
|
error = xfs_btree_insert(cur, &i);
|
|
if (error)
|
|
goto out_error;
|
|
}
|
|
|
|
out_done:
|
|
trace_xfs_rmap_unmap_done(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
out_error:
|
|
if (error)
|
|
trace_xfs_rmap_unmap_error(mp, cur->bc_private.a.agno,
|
|
error, _RET_IP_);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Remove a reference to an extent in the rmap btree.
|
|
*/
|
|
int
|
|
xfs_rmap_free(
|
|
struct xfs_trans *tp,
|
|
struct xfs_buf *agbp,
|
|
xfs_agnumber_t agno,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len,
|
|
struct xfs_owner_info *oinfo)
|
|
{
|
|
struct xfs_mount *mp = tp->t_mountp;
|
|
struct xfs_btree_cur *cur;
|
|
int error;
|
|
|
|
if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
|
|
return 0;
|
|
|
|
cur = xfs_rmapbt_init_cursor(mp, tp, agbp, agno);
|
|
|
|
error = xfs_rmap_unmap(cur, bno, len, false, oinfo);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
return 0;
|
|
|
|
out_error:
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* A mergeable rmap must have the same owner and the same values for
|
|
* the unwritten, attr_fork, and bmbt flags. The startblock and
|
|
* offset are checked separately.
|
|
*/
|
|
static bool
|
|
xfs_rmap_is_mergeable(
|
|
struct xfs_rmap_irec *irec,
|
|
uint64_t owner,
|
|
unsigned int flags)
|
|
{
|
|
if (irec->rm_owner == XFS_RMAP_OWN_NULL)
|
|
return false;
|
|
if (irec->rm_owner != owner)
|
|
return false;
|
|
if ((flags & XFS_RMAP_UNWRITTEN) ^
|
|
(irec->rm_flags & XFS_RMAP_UNWRITTEN))
|
|
return false;
|
|
if ((flags & XFS_RMAP_ATTR_FORK) ^
|
|
(irec->rm_flags & XFS_RMAP_ATTR_FORK))
|
|
return false;
|
|
if ((flags & XFS_RMAP_BMBT_BLOCK) ^
|
|
(irec->rm_flags & XFS_RMAP_BMBT_BLOCK))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* When we allocate a new block, the first thing we do is add a reference to
|
|
* the extent in the rmap btree. This takes the form of a [agbno, length,
|
|
* owner, offset] record. Flags are encoded in the high bits of the offset
|
|
* field.
|
|
*/
|
|
STATIC int
|
|
xfs_rmap_map(
|
|
struct xfs_btree_cur *cur,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len,
|
|
bool unwritten,
|
|
struct xfs_owner_info *oinfo)
|
|
{
|
|
struct xfs_mount *mp = cur->bc_mp;
|
|
struct xfs_rmap_irec ltrec;
|
|
struct xfs_rmap_irec gtrec;
|
|
int have_gt;
|
|
int have_lt;
|
|
int error = 0;
|
|
int i;
|
|
uint64_t owner;
|
|
uint64_t offset;
|
|
unsigned int flags = 0;
|
|
bool ignore_off;
|
|
|
|
xfs_owner_info_unpack(oinfo, &owner, &offset, &flags);
|
|
ASSERT(owner != 0);
|
|
ignore_off = XFS_RMAP_NON_INODE_OWNER(owner) ||
|
|
(flags & XFS_RMAP_BMBT_BLOCK);
|
|
if (unwritten)
|
|
flags |= XFS_RMAP_UNWRITTEN;
|
|
trace_xfs_rmap_map(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
|
|
/*
|
|
* For the initial lookup, look for an exact match or the left-adjacent
|
|
* record for our insertion point. This will also give us the record for
|
|
* start block contiguity tests.
|
|
*/
|
|
error = xfs_rmap_lookup_le(cur, bno, len, owner, offset, flags,
|
|
&have_lt);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, have_lt == 1, out_error);
|
|
|
|
error = xfs_rmap_get_rec(cur, <rec, &have_lt);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, have_lt == 1, out_error);
|
|
trace_xfs_rmap_lookup_le_range_result(cur->bc_mp,
|
|
cur->bc_private.a.agno, ltrec.rm_startblock,
|
|
ltrec.rm_blockcount, ltrec.rm_owner,
|
|
ltrec.rm_offset, ltrec.rm_flags);
|
|
|
|
if (!xfs_rmap_is_mergeable(<rec, owner, flags))
|
|
have_lt = 0;
|
|
|
|
XFS_WANT_CORRUPTED_GOTO(mp,
|
|
have_lt == 0 ||
|
|
ltrec.rm_startblock + ltrec.rm_blockcount <= bno, out_error);
|
|
|
|
/*
|
|
* Increment the cursor to see if we have a right-adjacent record to our
|
|
* insertion point. This will give us the record for end block
|
|
* contiguity tests.
|
|
*/
|
|
error = xfs_btree_increment(cur, 0, &have_gt);
|
|
if (error)
|
|
goto out_error;
|
|
if (have_gt) {
|
|
error = xfs_rmap_get_rec(cur, >rec, &have_gt);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, have_gt == 1, out_error);
|
|
XFS_WANT_CORRUPTED_GOTO(mp, bno + len <= gtrec.rm_startblock,
|
|
out_error);
|
|
trace_xfs_rmap_find_right_neighbor_result(cur->bc_mp,
|
|
cur->bc_private.a.agno, gtrec.rm_startblock,
|
|
gtrec.rm_blockcount, gtrec.rm_owner,
|
|
gtrec.rm_offset, gtrec.rm_flags);
|
|
if (!xfs_rmap_is_mergeable(>rec, owner, flags))
|
|
have_gt = 0;
|
|
}
|
|
|
|
/*
|
|
* Note: cursor currently points one record to the right of ltrec, even
|
|
* if there is no record in the tree to the right.
|
|
*/
|
|
if (have_lt &&
|
|
ltrec.rm_startblock + ltrec.rm_blockcount == bno &&
|
|
(ignore_off || ltrec.rm_offset + ltrec.rm_blockcount == offset)) {
|
|
/*
|
|
* left edge contiguous, merge into left record.
|
|
*
|
|
* ltbno ltlen
|
|
* orig: |ooooooooo|
|
|
* adding: |aaaaaaaaa|
|
|
* result: |rrrrrrrrrrrrrrrrrrr|
|
|
* bno len
|
|
*/
|
|
ltrec.rm_blockcount += len;
|
|
if (have_gt &&
|
|
bno + len == gtrec.rm_startblock &&
|
|
(ignore_off || offset + len == gtrec.rm_offset) &&
|
|
(unsigned long)ltrec.rm_blockcount + len +
|
|
gtrec.rm_blockcount <= XFS_RMAP_LEN_MAX) {
|
|
/*
|
|
* right edge also contiguous, delete right record
|
|
* and merge into left record.
|
|
*
|
|
* ltbno ltlen gtbno gtlen
|
|
* orig: |ooooooooo| |ooooooooo|
|
|
* adding: |aaaaaaaaa|
|
|
* result: |rrrrrrrrrrrrrrrrrrrrrrrrrrrrr|
|
|
*/
|
|
ltrec.rm_blockcount += gtrec.rm_blockcount;
|
|
trace_xfs_rmap_delete(mp, cur->bc_private.a.agno,
|
|
gtrec.rm_startblock,
|
|
gtrec.rm_blockcount,
|
|
gtrec.rm_owner,
|
|
gtrec.rm_offset,
|
|
gtrec.rm_flags);
|
|
error = xfs_btree_delete(cur, &i);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error);
|
|
}
|
|
|
|
/* point the cursor back to the left record and update */
|
|
error = xfs_btree_decrement(cur, 0, &have_gt);
|
|
if (error)
|
|
goto out_error;
|
|
error = xfs_rmap_update(cur, <rec);
|
|
if (error)
|
|
goto out_error;
|
|
} else if (have_gt &&
|
|
bno + len == gtrec.rm_startblock &&
|
|
(ignore_off || offset + len == gtrec.rm_offset)) {
|
|
/*
|
|
* right edge contiguous, merge into right record.
|
|
*
|
|
* gtbno gtlen
|
|
* Orig: |ooooooooo|
|
|
* adding: |aaaaaaaaa|
|
|
* Result: |rrrrrrrrrrrrrrrrrrr|
|
|
* bno len
|
|
*/
|
|
gtrec.rm_startblock = bno;
|
|
gtrec.rm_blockcount += len;
|
|
if (!ignore_off)
|
|
gtrec.rm_offset = offset;
|
|
error = xfs_rmap_update(cur, >rec);
|
|
if (error)
|
|
goto out_error;
|
|
} else {
|
|
/*
|
|
* no contiguous edge with identical owner, insert
|
|
* new record at current cursor position.
|
|
*/
|
|
cur->bc_rec.r.rm_startblock = bno;
|
|
cur->bc_rec.r.rm_blockcount = len;
|
|
cur->bc_rec.r.rm_owner = owner;
|
|
cur->bc_rec.r.rm_offset = offset;
|
|
cur->bc_rec.r.rm_flags = flags;
|
|
trace_xfs_rmap_insert(mp, cur->bc_private.a.agno, bno, len,
|
|
owner, offset, flags);
|
|
error = xfs_btree_insert(cur, &i);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error);
|
|
}
|
|
|
|
trace_xfs_rmap_map_done(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
out_error:
|
|
if (error)
|
|
trace_xfs_rmap_map_error(mp, cur->bc_private.a.agno,
|
|
error, _RET_IP_);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Add a reference to an extent in the rmap btree.
|
|
*/
|
|
int
|
|
xfs_rmap_alloc(
|
|
struct xfs_trans *tp,
|
|
struct xfs_buf *agbp,
|
|
xfs_agnumber_t agno,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len,
|
|
struct xfs_owner_info *oinfo)
|
|
{
|
|
struct xfs_mount *mp = tp->t_mountp;
|
|
struct xfs_btree_cur *cur;
|
|
int error;
|
|
|
|
if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
|
|
return 0;
|
|
|
|
cur = xfs_rmapbt_init_cursor(mp, tp, agbp, agno);
|
|
error = xfs_rmap_map(cur, bno, len, false, oinfo);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
|
|
return 0;
|
|
|
|
out_error:
|
|
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
|
|
return error;
|
|
}
|
|
|
|
#define RMAP_LEFT_CONTIG (1 << 0)
|
|
#define RMAP_RIGHT_CONTIG (1 << 1)
|
|
#define RMAP_LEFT_FILLING (1 << 2)
|
|
#define RMAP_RIGHT_FILLING (1 << 3)
|
|
#define RMAP_LEFT_VALID (1 << 6)
|
|
#define RMAP_RIGHT_VALID (1 << 7)
|
|
|
|
#define LEFT r[0]
|
|
#define RIGHT r[1]
|
|
#define PREV r[2]
|
|
#define NEW r[3]
|
|
|
|
/*
|
|
* Convert an unwritten extent to a real extent or vice versa.
|
|
* Does not handle overlapping extents.
|
|
*/
|
|
STATIC int
|
|
xfs_rmap_convert(
|
|
struct xfs_btree_cur *cur,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len,
|
|
bool unwritten,
|
|
struct xfs_owner_info *oinfo)
|
|
{
|
|
struct xfs_mount *mp = cur->bc_mp;
|
|
struct xfs_rmap_irec r[4]; /* neighbor extent entries */
|
|
/* left is 0, right is 1, prev is 2 */
|
|
/* new is 3 */
|
|
uint64_t owner;
|
|
uint64_t offset;
|
|
uint64_t new_endoff;
|
|
unsigned int oldext;
|
|
unsigned int newext;
|
|
unsigned int flags = 0;
|
|
int i;
|
|
int state = 0;
|
|
int error;
|
|
|
|
xfs_owner_info_unpack(oinfo, &owner, &offset, &flags);
|
|
ASSERT(!(XFS_RMAP_NON_INODE_OWNER(owner) ||
|
|
(flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))));
|
|
oldext = unwritten ? XFS_RMAP_UNWRITTEN : 0;
|
|
new_endoff = offset + len;
|
|
trace_xfs_rmap_convert(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
|
|
/*
|
|
* For the initial lookup, look for an exact match or the left-adjacent
|
|
* record for our insertion point. This will also give us the record for
|
|
* start block contiguity tests.
|
|
*/
|
|
error = xfs_rmap_lookup_le(cur, bno, len, owner, offset, oldext, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
|
|
error = xfs_rmap_get_rec(cur, &PREV, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
trace_xfs_rmap_lookup_le_range_result(cur->bc_mp,
|
|
cur->bc_private.a.agno, PREV.rm_startblock,
|
|
PREV.rm_blockcount, PREV.rm_owner,
|
|
PREV.rm_offset, PREV.rm_flags);
|
|
|
|
ASSERT(PREV.rm_offset <= offset);
|
|
ASSERT(PREV.rm_offset + PREV.rm_blockcount >= new_endoff);
|
|
ASSERT((PREV.rm_flags & XFS_RMAP_UNWRITTEN) == oldext);
|
|
newext = ~oldext & XFS_RMAP_UNWRITTEN;
|
|
|
|
/*
|
|
* Set flags determining what part of the previous oldext allocation
|
|
* extent is being replaced by a newext allocation.
|
|
*/
|
|
if (PREV.rm_offset == offset)
|
|
state |= RMAP_LEFT_FILLING;
|
|
if (PREV.rm_offset + PREV.rm_blockcount == new_endoff)
|
|
state |= RMAP_RIGHT_FILLING;
|
|
|
|
/*
|
|
* Decrement the cursor to see if we have a left-adjacent record to our
|
|
* insertion point. This will give us the record for end block
|
|
* contiguity tests.
|
|
*/
|
|
error = xfs_btree_decrement(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
if (i) {
|
|
state |= RMAP_LEFT_VALID;
|
|
error = xfs_rmap_get_rec(cur, &LEFT, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
XFS_WANT_CORRUPTED_GOTO(mp,
|
|
LEFT.rm_startblock + LEFT.rm_blockcount <= bno,
|
|
done);
|
|
trace_xfs_rmap_find_left_neighbor_result(cur->bc_mp,
|
|
cur->bc_private.a.agno, LEFT.rm_startblock,
|
|
LEFT.rm_blockcount, LEFT.rm_owner,
|
|
LEFT.rm_offset, LEFT.rm_flags);
|
|
if (LEFT.rm_startblock + LEFT.rm_blockcount == bno &&
|
|
LEFT.rm_offset + LEFT.rm_blockcount == offset &&
|
|
xfs_rmap_is_mergeable(&LEFT, owner, newext))
|
|
state |= RMAP_LEFT_CONTIG;
|
|
}
|
|
|
|
/*
|
|
* Increment the cursor to see if we have a right-adjacent record to our
|
|
* insertion point. This will give us the record for end block
|
|
* contiguity tests.
|
|
*/
|
|
error = xfs_btree_increment(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
error = xfs_btree_increment(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
if (i) {
|
|
state |= RMAP_RIGHT_VALID;
|
|
error = xfs_rmap_get_rec(cur, &RIGHT, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
XFS_WANT_CORRUPTED_GOTO(mp, bno + len <= RIGHT.rm_startblock,
|
|
done);
|
|
trace_xfs_rmap_find_right_neighbor_result(cur->bc_mp,
|
|
cur->bc_private.a.agno, RIGHT.rm_startblock,
|
|
RIGHT.rm_blockcount, RIGHT.rm_owner,
|
|
RIGHT.rm_offset, RIGHT.rm_flags);
|
|
if (bno + len == RIGHT.rm_startblock &&
|
|
offset + len == RIGHT.rm_offset &&
|
|
xfs_rmap_is_mergeable(&RIGHT, owner, newext))
|
|
state |= RMAP_RIGHT_CONTIG;
|
|
}
|
|
|
|
/* check that left + prev + right is not too long */
|
|
if ((state & (RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG |
|
|
RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG)) ==
|
|
(RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG |
|
|
RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG) &&
|
|
(unsigned long)LEFT.rm_blockcount + len +
|
|
RIGHT.rm_blockcount > XFS_RMAP_LEN_MAX)
|
|
state &= ~RMAP_RIGHT_CONTIG;
|
|
|
|
trace_xfs_rmap_convert_state(mp, cur->bc_private.a.agno, state,
|
|
_RET_IP_);
|
|
|
|
/* reset the cursor back to PREV */
|
|
error = xfs_rmap_lookup_le(cur, bno, len, owner, offset, oldext, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
|
|
/*
|
|
* Switch out based on the FILLING and CONTIG state bits.
|
|
*/
|
|
switch (state & (RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG |
|
|
RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG)) {
|
|
case RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG |
|
|
RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* The left and right neighbors are both contiguous with new.
|
|
*/
|
|
error = xfs_btree_increment(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
trace_xfs_rmap_delete(mp, cur->bc_private.a.agno,
|
|
RIGHT.rm_startblock, RIGHT.rm_blockcount,
|
|
RIGHT.rm_owner, RIGHT.rm_offset,
|
|
RIGHT.rm_flags);
|
|
error = xfs_btree_delete(cur, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
error = xfs_btree_decrement(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
trace_xfs_rmap_delete(mp, cur->bc_private.a.agno,
|
|
PREV.rm_startblock, PREV.rm_blockcount,
|
|
PREV.rm_owner, PREV.rm_offset,
|
|
PREV.rm_flags);
|
|
error = xfs_btree_delete(cur, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
error = xfs_btree_decrement(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW = LEFT;
|
|
NEW.rm_blockcount += PREV.rm_blockcount + RIGHT.rm_blockcount;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING | RMAP_RIGHT_FILLING | RMAP_LEFT_CONTIG:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* The left neighbor is contiguous, the right is not.
|
|
*/
|
|
trace_xfs_rmap_delete(mp, cur->bc_private.a.agno,
|
|
PREV.rm_startblock, PREV.rm_blockcount,
|
|
PREV.rm_owner, PREV.rm_offset,
|
|
PREV.rm_flags);
|
|
error = xfs_btree_delete(cur, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
error = xfs_btree_decrement(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW = LEFT;
|
|
NEW.rm_blockcount += PREV.rm_blockcount;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING | RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* The right neighbor is contiguous, the left is not.
|
|
*/
|
|
error = xfs_btree_increment(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
trace_xfs_rmap_delete(mp, cur->bc_private.a.agno,
|
|
RIGHT.rm_startblock, RIGHT.rm_blockcount,
|
|
RIGHT.rm_owner, RIGHT.rm_offset,
|
|
RIGHT.rm_flags);
|
|
error = xfs_btree_delete(cur, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
error = xfs_btree_decrement(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW = PREV;
|
|
NEW.rm_blockcount = len + RIGHT.rm_blockcount;
|
|
NEW.rm_flags = newext;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING | RMAP_RIGHT_FILLING:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* Neither the left nor right neighbors are contiguous with
|
|
* the new one.
|
|
*/
|
|
NEW = PREV;
|
|
NEW.rm_flags = newext;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG:
|
|
/*
|
|
* Setting the first part of a previous oldext extent to newext.
|
|
* The left neighbor is contiguous.
|
|
*/
|
|
NEW = PREV;
|
|
NEW.rm_offset += len;
|
|
NEW.rm_startblock += len;
|
|
NEW.rm_blockcount -= len;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_btree_decrement(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
NEW = LEFT;
|
|
NEW.rm_blockcount += len;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING:
|
|
/*
|
|
* Setting the first part of a previous oldext extent to newext.
|
|
* The left neighbor is not contiguous.
|
|
*/
|
|
NEW = PREV;
|
|
NEW.rm_startblock += len;
|
|
NEW.rm_offset += len;
|
|
NEW.rm_blockcount -= len;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
NEW.rm_startblock = bno;
|
|
NEW.rm_owner = owner;
|
|
NEW.rm_offset = offset;
|
|
NEW.rm_blockcount = len;
|
|
NEW.rm_flags = newext;
|
|
cur->bc_rec.r = NEW;
|
|
trace_xfs_rmap_insert(mp, cur->bc_private.a.agno, bno,
|
|
len, owner, offset, newext);
|
|
error = xfs_btree_insert(cur, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
break;
|
|
|
|
case RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Setting the last part of a previous oldext extent to newext.
|
|
* The right neighbor is contiguous with the new allocation.
|
|
*/
|
|
NEW = PREV;
|
|
NEW.rm_blockcount -= len;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_btree_increment(cur, 0, &i);
|
|
if (error)
|
|
goto done;
|
|
NEW = RIGHT;
|
|
NEW.rm_offset = offset;
|
|
NEW.rm_startblock = bno;
|
|
NEW.rm_blockcount += len;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_RIGHT_FILLING:
|
|
/*
|
|
* Setting the last part of a previous oldext extent to newext.
|
|
* The right neighbor is not contiguous.
|
|
*/
|
|
NEW = PREV;
|
|
NEW.rm_blockcount -= len;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_rmap_lookup_eq(cur, bno, len, owner, offset,
|
|
oldext, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
|
|
NEW.rm_startblock = bno;
|
|
NEW.rm_owner = owner;
|
|
NEW.rm_offset = offset;
|
|
NEW.rm_blockcount = len;
|
|
NEW.rm_flags = newext;
|
|
cur->bc_rec.r = NEW;
|
|
trace_xfs_rmap_insert(mp, cur->bc_private.a.agno, bno,
|
|
len, owner, offset, newext);
|
|
error = xfs_btree_insert(cur, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
break;
|
|
|
|
case 0:
|
|
/*
|
|
* Setting the middle part of a previous oldext extent to
|
|
* newext. Contiguity is impossible here.
|
|
* One extent becomes three extents.
|
|
*/
|
|
/* new right extent - oldext */
|
|
NEW.rm_startblock = bno + len;
|
|
NEW.rm_owner = owner;
|
|
NEW.rm_offset = new_endoff;
|
|
NEW.rm_blockcount = PREV.rm_offset + PREV.rm_blockcount -
|
|
new_endoff;
|
|
NEW.rm_flags = PREV.rm_flags;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
/* new left extent - oldext */
|
|
NEW = PREV;
|
|
NEW.rm_blockcount = offset - PREV.rm_offset;
|
|
cur->bc_rec.r = NEW;
|
|
trace_xfs_rmap_insert(mp, cur->bc_private.a.agno,
|
|
NEW.rm_startblock, NEW.rm_blockcount,
|
|
NEW.rm_owner, NEW.rm_offset,
|
|
NEW.rm_flags);
|
|
error = xfs_btree_insert(cur, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
/*
|
|
* Reset the cursor to the position of the new extent
|
|
* we are about to insert as we can't trust it after
|
|
* the previous insert.
|
|
*/
|
|
error = xfs_rmap_lookup_eq(cur, bno, len, owner, offset,
|
|
oldext, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 0, done);
|
|
/* new middle extent - newext */
|
|
cur->bc_rec.r.rm_flags &= ~XFS_RMAP_UNWRITTEN;
|
|
cur->bc_rec.r.rm_flags |= newext;
|
|
trace_xfs_rmap_insert(mp, cur->bc_private.a.agno, bno, len,
|
|
owner, offset, newext);
|
|
error = xfs_btree_insert(cur, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG | RMAP_RIGHT_CONTIG:
|
|
case RMAP_RIGHT_FILLING | RMAP_LEFT_CONTIG | RMAP_RIGHT_CONTIG:
|
|
case RMAP_LEFT_FILLING | RMAP_RIGHT_CONTIG:
|
|
case RMAP_RIGHT_FILLING | RMAP_LEFT_CONTIG:
|
|
case RMAP_LEFT_CONTIG | RMAP_RIGHT_CONTIG:
|
|
case RMAP_LEFT_CONTIG:
|
|
case RMAP_RIGHT_CONTIG:
|
|
/*
|
|
* These cases are all impossible.
|
|
*/
|
|
ASSERT(0);
|
|
}
|
|
|
|
trace_xfs_rmap_convert_done(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
done:
|
|
if (error)
|
|
trace_xfs_rmap_convert_error(cur->bc_mp,
|
|
cur->bc_private.a.agno, error, _RET_IP_);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Convert an unwritten extent to a real extent or vice versa. If there is no
|
|
* possibility of overlapping extents, delegate to the simpler convert
|
|
* function.
|
|
*/
|
|
STATIC int
|
|
xfs_rmap_convert_shared(
|
|
struct xfs_btree_cur *cur,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len,
|
|
bool unwritten,
|
|
struct xfs_owner_info *oinfo)
|
|
{
|
|
struct xfs_mount *mp = cur->bc_mp;
|
|
struct xfs_rmap_irec r[4]; /* neighbor extent entries */
|
|
/* left is 0, right is 1, prev is 2 */
|
|
/* new is 3 */
|
|
uint64_t owner;
|
|
uint64_t offset;
|
|
uint64_t new_endoff;
|
|
unsigned int oldext;
|
|
unsigned int newext;
|
|
unsigned int flags = 0;
|
|
int i;
|
|
int state = 0;
|
|
int error;
|
|
|
|
xfs_owner_info_unpack(oinfo, &owner, &offset, &flags);
|
|
ASSERT(!(XFS_RMAP_NON_INODE_OWNER(owner) ||
|
|
(flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))));
|
|
oldext = unwritten ? XFS_RMAP_UNWRITTEN : 0;
|
|
new_endoff = offset + len;
|
|
trace_xfs_rmap_convert(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
|
|
/*
|
|
* For the initial lookup, look for and exact match or the left-adjacent
|
|
* record for our insertion point. This will also give us the record for
|
|
* start block contiguity tests.
|
|
*/
|
|
error = xfs_rmap_lookup_le_range(cur, bno, owner, offset, flags,
|
|
&PREV, &i);
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
|
|
ASSERT(PREV.rm_offset <= offset);
|
|
ASSERT(PREV.rm_offset + PREV.rm_blockcount >= new_endoff);
|
|
ASSERT((PREV.rm_flags & XFS_RMAP_UNWRITTEN) == oldext);
|
|
newext = ~oldext & XFS_RMAP_UNWRITTEN;
|
|
|
|
/*
|
|
* Set flags determining what part of the previous oldext allocation
|
|
* extent is being replaced by a newext allocation.
|
|
*/
|
|
if (PREV.rm_offset == offset)
|
|
state |= RMAP_LEFT_FILLING;
|
|
if (PREV.rm_offset + PREV.rm_blockcount == new_endoff)
|
|
state |= RMAP_RIGHT_FILLING;
|
|
|
|
/* Is there a left record that abuts our range? */
|
|
error = xfs_rmap_find_left_neighbor(cur, bno, owner, offset, newext,
|
|
&LEFT, &i);
|
|
if (error)
|
|
goto done;
|
|
if (i) {
|
|
state |= RMAP_LEFT_VALID;
|
|
XFS_WANT_CORRUPTED_GOTO(mp,
|
|
LEFT.rm_startblock + LEFT.rm_blockcount <= bno,
|
|
done);
|
|
if (xfs_rmap_is_mergeable(&LEFT, owner, newext))
|
|
state |= RMAP_LEFT_CONTIG;
|
|
}
|
|
|
|
/* Is there a right record that abuts our range? */
|
|
error = xfs_rmap_lookup_eq(cur, bno + len, len, owner, offset + len,
|
|
newext, &i);
|
|
if (error)
|
|
goto done;
|
|
if (i) {
|
|
state |= RMAP_RIGHT_VALID;
|
|
error = xfs_rmap_get_rec(cur, &RIGHT, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
XFS_WANT_CORRUPTED_GOTO(mp, bno + len <= RIGHT.rm_startblock,
|
|
done);
|
|
trace_xfs_rmap_find_right_neighbor_result(cur->bc_mp,
|
|
cur->bc_private.a.agno, RIGHT.rm_startblock,
|
|
RIGHT.rm_blockcount, RIGHT.rm_owner,
|
|
RIGHT.rm_offset, RIGHT.rm_flags);
|
|
if (xfs_rmap_is_mergeable(&RIGHT, owner, newext))
|
|
state |= RMAP_RIGHT_CONTIG;
|
|
}
|
|
|
|
/* check that left + prev + right is not too long */
|
|
if ((state & (RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG |
|
|
RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG)) ==
|
|
(RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG |
|
|
RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG) &&
|
|
(unsigned long)LEFT.rm_blockcount + len +
|
|
RIGHT.rm_blockcount > XFS_RMAP_LEN_MAX)
|
|
state &= ~RMAP_RIGHT_CONTIG;
|
|
|
|
trace_xfs_rmap_convert_state(mp, cur->bc_private.a.agno, state,
|
|
_RET_IP_);
|
|
/*
|
|
* Switch out based on the FILLING and CONTIG state bits.
|
|
*/
|
|
switch (state & (RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG |
|
|
RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG)) {
|
|
case RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG |
|
|
RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* The left and right neighbors are both contiguous with new.
|
|
*/
|
|
error = xfs_rmap_delete(cur, RIGHT.rm_startblock,
|
|
RIGHT.rm_blockcount, RIGHT.rm_owner,
|
|
RIGHT.rm_offset, RIGHT.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_rmap_delete(cur, PREV.rm_startblock,
|
|
PREV.rm_blockcount, PREV.rm_owner,
|
|
PREV.rm_offset, PREV.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
NEW = LEFT;
|
|
error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW.rm_blockcount += PREV.rm_blockcount + RIGHT.rm_blockcount;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING | RMAP_RIGHT_FILLING | RMAP_LEFT_CONTIG:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* The left neighbor is contiguous, the right is not.
|
|
*/
|
|
error = xfs_rmap_delete(cur, PREV.rm_startblock,
|
|
PREV.rm_blockcount, PREV.rm_owner,
|
|
PREV.rm_offset, PREV.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
NEW = LEFT;
|
|
error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW.rm_blockcount += PREV.rm_blockcount;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING | RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* The right neighbor is contiguous, the left is not.
|
|
*/
|
|
error = xfs_rmap_delete(cur, RIGHT.rm_startblock,
|
|
RIGHT.rm_blockcount, RIGHT.rm_owner,
|
|
RIGHT.rm_offset, RIGHT.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
NEW = PREV;
|
|
error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW.rm_blockcount += RIGHT.rm_blockcount;
|
|
NEW.rm_flags = RIGHT.rm_flags;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING | RMAP_RIGHT_FILLING:
|
|
/*
|
|
* Setting all of a previous oldext extent to newext.
|
|
* Neither the left nor right neighbors are contiguous with
|
|
* the new one.
|
|
*/
|
|
NEW = PREV;
|
|
error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW.rm_flags = newext;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG:
|
|
/*
|
|
* Setting the first part of a previous oldext extent to newext.
|
|
* The left neighbor is contiguous.
|
|
*/
|
|
NEW = PREV;
|
|
error = xfs_rmap_delete(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
NEW.rm_offset += len;
|
|
NEW.rm_startblock += len;
|
|
NEW.rm_blockcount -= len;
|
|
error = xfs_rmap_insert(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
NEW = LEFT;
|
|
error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW.rm_blockcount += len;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING:
|
|
/*
|
|
* Setting the first part of a previous oldext extent to newext.
|
|
* The left neighbor is not contiguous.
|
|
*/
|
|
NEW = PREV;
|
|
error = xfs_rmap_delete(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
NEW.rm_offset += len;
|
|
NEW.rm_startblock += len;
|
|
NEW.rm_blockcount -= len;
|
|
error = xfs_rmap_insert(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_rmap_insert(cur, bno, len, owner, offset, newext);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_RIGHT_FILLING | RMAP_RIGHT_CONTIG:
|
|
/*
|
|
* Setting the last part of a previous oldext extent to newext.
|
|
* The right neighbor is contiguous with the new allocation.
|
|
*/
|
|
NEW = PREV;
|
|
error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW.rm_blockcount = offset - NEW.rm_offset;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
NEW = RIGHT;
|
|
error = xfs_rmap_delete(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
NEW.rm_offset = offset;
|
|
NEW.rm_startblock = bno;
|
|
NEW.rm_blockcount += len;
|
|
error = xfs_rmap_insert(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_RIGHT_FILLING:
|
|
/*
|
|
* Setting the last part of a previous oldext extent to newext.
|
|
* The right neighbor is not contiguous.
|
|
*/
|
|
NEW = PREV;
|
|
error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW.rm_blockcount -= len;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
error = xfs_rmap_insert(cur, bno, len, owner, offset, newext);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case 0:
|
|
/*
|
|
* Setting the middle part of a previous oldext extent to
|
|
* newext. Contiguity is impossible here.
|
|
* One extent becomes three extents.
|
|
*/
|
|
/* new right extent - oldext */
|
|
NEW.rm_startblock = bno + len;
|
|
NEW.rm_owner = owner;
|
|
NEW.rm_offset = new_endoff;
|
|
NEW.rm_blockcount = PREV.rm_offset + PREV.rm_blockcount -
|
|
new_endoff;
|
|
NEW.rm_flags = PREV.rm_flags;
|
|
error = xfs_rmap_insert(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner, NEW.rm_offset,
|
|
NEW.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
/* new left extent - oldext */
|
|
NEW = PREV;
|
|
error = xfs_rmap_lookup_eq(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner,
|
|
NEW.rm_offset, NEW.rm_flags, &i);
|
|
if (error)
|
|
goto done;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, done);
|
|
NEW.rm_blockcount = offset - NEW.rm_offset;
|
|
error = xfs_rmap_update(cur, &NEW);
|
|
if (error)
|
|
goto done;
|
|
/* new middle extent - newext */
|
|
NEW.rm_startblock = bno;
|
|
NEW.rm_blockcount = len;
|
|
NEW.rm_owner = owner;
|
|
NEW.rm_offset = offset;
|
|
NEW.rm_flags = newext;
|
|
error = xfs_rmap_insert(cur, NEW.rm_startblock,
|
|
NEW.rm_blockcount, NEW.rm_owner, NEW.rm_offset,
|
|
NEW.rm_flags);
|
|
if (error)
|
|
goto done;
|
|
break;
|
|
|
|
case RMAP_LEFT_FILLING | RMAP_LEFT_CONTIG | RMAP_RIGHT_CONTIG:
|
|
case RMAP_RIGHT_FILLING | RMAP_LEFT_CONTIG | RMAP_RIGHT_CONTIG:
|
|
case RMAP_LEFT_FILLING | RMAP_RIGHT_CONTIG:
|
|
case RMAP_RIGHT_FILLING | RMAP_LEFT_CONTIG:
|
|
case RMAP_LEFT_CONTIG | RMAP_RIGHT_CONTIG:
|
|
case RMAP_LEFT_CONTIG:
|
|
case RMAP_RIGHT_CONTIG:
|
|
/*
|
|
* These cases are all impossible.
|
|
*/
|
|
ASSERT(0);
|
|
}
|
|
|
|
trace_xfs_rmap_convert_done(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
done:
|
|
if (error)
|
|
trace_xfs_rmap_convert_error(cur->bc_mp,
|
|
cur->bc_private.a.agno, error, _RET_IP_);
|
|
return error;
|
|
}
|
|
|
|
#undef NEW
|
|
#undef LEFT
|
|
#undef RIGHT
|
|
#undef PREV
|
|
|
|
/*
|
|
* Find an extent in the rmap btree and unmap it. For rmap extent types that
|
|
* can overlap (data fork rmaps on reflink filesystems) we must be careful
|
|
* that the prev/next records in the btree might belong to another owner.
|
|
* Therefore we must use delete+insert to alter any of the key fields.
|
|
*
|
|
* For every other situation there can only be one owner for a given extent,
|
|
* so we can call the regular _free function.
|
|
*/
|
|
STATIC int
|
|
xfs_rmap_unmap_shared(
|
|
struct xfs_btree_cur *cur,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len,
|
|
bool unwritten,
|
|
struct xfs_owner_info *oinfo)
|
|
{
|
|
struct xfs_mount *mp = cur->bc_mp;
|
|
struct xfs_rmap_irec ltrec;
|
|
uint64_t ltoff;
|
|
int error = 0;
|
|
int i;
|
|
uint64_t owner;
|
|
uint64_t offset;
|
|
unsigned int flags;
|
|
|
|
xfs_owner_info_unpack(oinfo, &owner, &offset, &flags);
|
|
if (unwritten)
|
|
flags |= XFS_RMAP_UNWRITTEN;
|
|
trace_xfs_rmap_unmap(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
|
|
/*
|
|
* We should always have a left record because there's a static record
|
|
* for the AG headers at rm_startblock == 0 created by mkfs/growfs that
|
|
* will not ever be removed from the tree.
|
|
*/
|
|
error = xfs_rmap_lookup_le_range(cur, bno, owner, offset, flags,
|
|
<rec, &i);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error);
|
|
ltoff = ltrec.rm_offset;
|
|
|
|
/* Make sure the extent we found covers the entire freeing range. */
|
|
XFS_WANT_CORRUPTED_GOTO(mp, ltrec.rm_startblock <= bno &&
|
|
ltrec.rm_startblock + ltrec.rm_blockcount >=
|
|
bno + len, out_error);
|
|
|
|
/* Make sure the owner matches what we expect to find in the tree. */
|
|
XFS_WANT_CORRUPTED_GOTO(mp, owner == ltrec.rm_owner, out_error);
|
|
|
|
/* Make sure the unwritten flag matches. */
|
|
XFS_WANT_CORRUPTED_GOTO(mp, (flags & XFS_RMAP_UNWRITTEN) ==
|
|
(ltrec.rm_flags & XFS_RMAP_UNWRITTEN), out_error);
|
|
|
|
/* Check the offset. */
|
|
XFS_WANT_CORRUPTED_GOTO(mp, ltrec.rm_offset <= offset, out_error);
|
|
XFS_WANT_CORRUPTED_GOTO(mp, offset <= ltoff + ltrec.rm_blockcount,
|
|
out_error);
|
|
|
|
if (ltrec.rm_startblock == bno && ltrec.rm_blockcount == len) {
|
|
/* Exact match, simply remove the record from rmap tree. */
|
|
error = xfs_rmap_delete(cur, ltrec.rm_startblock,
|
|
ltrec.rm_blockcount, ltrec.rm_owner,
|
|
ltrec.rm_offset, ltrec.rm_flags);
|
|
if (error)
|
|
goto out_error;
|
|
} else if (ltrec.rm_startblock == bno) {
|
|
/*
|
|
* Overlap left hand side of extent: move the start, trim the
|
|
* length and update the current record.
|
|
*
|
|
* ltbno ltlen
|
|
* Orig: |oooooooooooooooooooo|
|
|
* Freeing: |fffffffff|
|
|
* Result: |rrrrrrrrrr|
|
|
* bno len
|
|
*/
|
|
|
|
/* Delete prev rmap. */
|
|
error = xfs_rmap_delete(cur, ltrec.rm_startblock,
|
|
ltrec.rm_blockcount, ltrec.rm_owner,
|
|
ltrec.rm_offset, ltrec.rm_flags);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
/* Add an rmap at the new offset. */
|
|
ltrec.rm_startblock += len;
|
|
ltrec.rm_blockcount -= len;
|
|
ltrec.rm_offset += len;
|
|
error = xfs_rmap_insert(cur, ltrec.rm_startblock,
|
|
ltrec.rm_blockcount, ltrec.rm_owner,
|
|
ltrec.rm_offset, ltrec.rm_flags);
|
|
if (error)
|
|
goto out_error;
|
|
} else if (ltrec.rm_startblock + ltrec.rm_blockcount == bno + len) {
|
|
/*
|
|
* Overlap right hand side of extent: trim the length and
|
|
* update the current record.
|
|
*
|
|
* ltbno ltlen
|
|
* Orig: |oooooooooooooooooooo|
|
|
* Freeing: |fffffffff|
|
|
* Result: |rrrrrrrrrr|
|
|
* bno len
|
|
*/
|
|
error = xfs_rmap_lookup_eq(cur, ltrec.rm_startblock,
|
|
ltrec.rm_blockcount, ltrec.rm_owner,
|
|
ltrec.rm_offset, ltrec.rm_flags, &i);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error);
|
|
ltrec.rm_blockcount -= len;
|
|
error = xfs_rmap_update(cur, <rec);
|
|
if (error)
|
|
goto out_error;
|
|
} else {
|
|
/*
|
|
* Overlap middle of extent: trim the length of the existing
|
|
* record to the length of the new left-extent size, increment
|
|
* the insertion position so we can insert a new record
|
|
* containing the remaining right-extent space.
|
|
*
|
|
* ltbno ltlen
|
|
* Orig: |oooooooooooooooooooo|
|
|
* Freeing: |fffffffff|
|
|
* Result: |rrrrr| |rrrr|
|
|
* bno len
|
|
*/
|
|
xfs_extlen_t orig_len = ltrec.rm_blockcount;
|
|
|
|
/* Shrink the left side of the rmap */
|
|
error = xfs_rmap_lookup_eq(cur, ltrec.rm_startblock,
|
|
ltrec.rm_blockcount, ltrec.rm_owner,
|
|
ltrec.rm_offset, ltrec.rm_flags, &i);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error);
|
|
ltrec.rm_blockcount = bno - ltrec.rm_startblock;
|
|
error = xfs_rmap_update(cur, <rec);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
/* Add an rmap at the new offset */
|
|
error = xfs_rmap_insert(cur, bno + len,
|
|
orig_len - len - ltrec.rm_blockcount,
|
|
ltrec.rm_owner, offset + len,
|
|
ltrec.rm_flags);
|
|
if (error)
|
|
goto out_error;
|
|
}
|
|
|
|
trace_xfs_rmap_unmap_done(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
out_error:
|
|
if (error)
|
|
trace_xfs_rmap_unmap_error(cur->bc_mp,
|
|
cur->bc_private.a.agno, error, _RET_IP_);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Find an extent in the rmap btree and map it. For rmap extent types that
|
|
* can overlap (data fork rmaps on reflink filesystems) we must be careful
|
|
* that the prev/next records in the btree might belong to another owner.
|
|
* Therefore we must use delete+insert to alter any of the key fields.
|
|
*
|
|
* For every other situation there can only be one owner for a given extent,
|
|
* so we can call the regular _alloc function.
|
|
*/
|
|
STATIC int
|
|
xfs_rmap_map_shared(
|
|
struct xfs_btree_cur *cur,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len,
|
|
bool unwritten,
|
|
struct xfs_owner_info *oinfo)
|
|
{
|
|
struct xfs_mount *mp = cur->bc_mp;
|
|
struct xfs_rmap_irec ltrec;
|
|
struct xfs_rmap_irec gtrec;
|
|
int have_gt;
|
|
int have_lt;
|
|
int error = 0;
|
|
int i;
|
|
uint64_t owner;
|
|
uint64_t offset;
|
|
unsigned int flags = 0;
|
|
|
|
xfs_owner_info_unpack(oinfo, &owner, &offset, &flags);
|
|
if (unwritten)
|
|
flags |= XFS_RMAP_UNWRITTEN;
|
|
trace_xfs_rmap_map(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
|
|
/* Is there a left record that abuts our range? */
|
|
error = xfs_rmap_find_left_neighbor(cur, bno, owner, offset, flags,
|
|
<rec, &have_lt);
|
|
if (error)
|
|
goto out_error;
|
|
if (have_lt &&
|
|
!xfs_rmap_is_mergeable(<rec, owner, flags))
|
|
have_lt = 0;
|
|
|
|
/* Is there a right record that abuts our range? */
|
|
error = xfs_rmap_lookup_eq(cur, bno + len, len, owner, offset + len,
|
|
flags, &have_gt);
|
|
if (error)
|
|
goto out_error;
|
|
if (have_gt) {
|
|
error = xfs_rmap_get_rec(cur, >rec, &have_gt);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, have_gt == 1, out_error);
|
|
trace_xfs_rmap_find_right_neighbor_result(cur->bc_mp,
|
|
cur->bc_private.a.agno, gtrec.rm_startblock,
|
|
gtrec.rm_blockcount, gtrec.rm_owner,
|
|
gtrec.rm_offset, gtrec.rm_flags);
|
|
|
|
if (!xfs_rmap_is_mergeable(>rec, owner, flags))
|
|
have_gt = 0;
|
|
}
|
|
|
|
if (have_lt &&
|
|
ltrec.rm_startblock + ltrec.rm_blockcount == bno &&
|
|
ltrec.rm_offset + ltrec.rm_blockcount == offset) {
|
|
/*
|
|
* Left edge contiguous, merge into left record.
|
|
*
|
|
* ltbno ltlen
|
|
* orig: |ooooooooo|
|
|
* adding: |aaaaaaaaa|
|
|
* result: |rrrrrrrrrrrrrrrrrrr|
|
|
* bno len
|
|
*/
|
|
ltrec.rm_blockcount += len;
|
|
if (have_gt &&
|
|
bno + len == gtrec.rm_startblock &&
|
|
offset + len == gtrec.rm_offset) {
|
|
/*
|
|
* Right edge also contiguous, delete right record
|
|
* and merge into left record.
|
|
*
|
|
* ltbno ltlen gtbno gtlen
|
|
* orig: |ooooooooo| |ooooooooo|
|
|
* adding: |aaaaaaaaa|
|
|
* result: |rrrrrrrrrrrrrrrrrrrrrrrrrrrrr|
|
|
*/
|
|
ltrec.rm_blockcount += gtrec.rm_blockcount;
|
|
error = xfs_rmap_delete(cur, gtrec.rm_startblock,
|
|
gtrec.rm_blockcount, gtrec.rm_owner,
|
|
gtrec.rm_offset, gtrec.rm_flags);
|
|
if (error)
|
|
goto out_error;
|
|
}
|
|
|
|
/* Point the cursor back to the left record and update. */
|
|
error = xfs_rmap_lookup_eq(cur, ltrec.rm_startblock,
|
|
ltrec.rm_blockcount, ltrec.rm_owner,
|
|
ltrec.rm_offset, ltrec.rm_flags, &i);
|
|
if (error)
|
|
goto out_error;
|
|
XFS_WANT_CORRUPTED_GOTO(mp, i == 1, out_error);
|
|
|
|
error = xfs_rmap_update(cur, <rec);
|
|
if (error)
|
|
goto out_error;
|
|
} else if (have_gt &&
|
|
bno + len == gtrec.rm_startblock &&
|
|
offset + len == gtrec.rm_offset) {
|
|
/*
|
|
* Right edge contiguous, merge into right record.
|
|
*
|
|
* gtbno gtlen
|
|
* Orig: |ooooooooo|
|
|
* adding: |aaaaaaaaa|
|
|
* Result: |rrrrrrrrrrrrrrrrrrr|
|
|
* bno len
|
|
*/
|
|
/* Delete the old record. */
|
|
error = xfs_rmap_delete(cur, gtrec.rm_startblock,
|
|
gtrec.rm_blockcount, gtrec.rm_owner,
|
|
gtrec.rm_offset, gtrec.rm_flags);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
/* Move the start and re-add it. */
|
|
gtrec.rm_startblock = bno;
|
|
gtrec.rm_blockcount += len;
|
|
gtrec.rm_offset = offset;
|
|
error = xfs_rmap_insert(cur, gtrec.rm_startblock,
|
|
gtrec.rm_blockcount, gtrec.rm_owner,
|
|
gtrec.rm_offset, gtrec.rm_flags);
|
|
if (error)
|
|
goto out_error;
|
|
} else {
|
|
/*
|
|
* No contiguous edge with identical owner, insert
|
|
* new record at current cursor position.
|
|
*/
|
|
error = xfs_rmap_insert(cur, bno, len, owner, offset, flags);
|
|
if (error)
|
|
goto out_error;
|
|
}
|
|
|
|
trace_xfs_rmap_map_done(mp, cur->bc_private.a.agno, bno, len,
|
|
unwritten, oinfo);
|
|
out_error:
|
|
if (error)
|
|
trace_xfs_rmap_map_error(cur->bc_mp,
|
|
cur->bc_private.a.agno, error, _RET_IP_);
|
|
return error;
|
|
}
|
|
|
|
struct xfs_rmap_query_range_info {
|
|
xfs_rmap_query_range_fn fn;
|
|
void *priv;
|
|
};
|
|
|
|
/* Format btree record and pass to our callback. */
|
|
STATIC int
|
|
xfs_rmap_query_range_helper(
|
|
struct xfs_btree_cur *cur,
|
|
union xfs_btree_rec *rec,
|
|
void *priv)
|
|
{
|
|
struct xfs_rmap_query_range_info *query = priv;
|
|
struct xfs_rmap_irec irec;
|
|
int error;
|
|
|
|
error = xfs_rmap_btrec_to_irec(rec, &irec);
|
|
if (error)
|
|
return error;
|
|
return query->fn(cur, &irec, query->priv);
|
|
}
|
|
|
|
/* Find all rmaps between two keys. */
|
|
int
|
|
xfs_rmap_query_range(
|
|
struct xfs_btree_cur *cur,
|
|
struct xfs_rmap_irec *low_rec,
|
|
struct xfs_rmap_irec *high_rec,
|
|
xfs_rmap_query_range_fn fn,
|
|
void *priv)
|
|
{
|
|
union xfs_btree_irec low_brec;
|
|
union xfs_btree_irec high_brec;
|
|
struct xfs_rmap_query_range_info query;
|
|
|
|
low_brec.r = *low_rec;
|
|
high_brec.r = *high_rec;
|
|
query.priv = priv;
|
|
query.fn = fn;
|
|
return xfs_btree_query_range(cur, &low_brec, &high_brec,
|
|
xfs_rmap_query_range_helper, &query);
|
|
}
|
|
|
|
/* Clean up after calling xfs_rmap_finish_one. */
|
|
void
|
|
xfs_rmap_finish_one_cleanup(
|
|
struct xfs_trans *tp,
|
|
struct xfs_btree_cur *rcur,
|
|
int error)
|
|
{
|
|
struct xfs_buf *agbp;
|
|
|
|
if (rcur == NULL)
|
|
return;
|
|
agbp = rcur->bc_private.a.agbp;
|
|
xfs_btree_del_cursor(rcur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
|
|
if (error)
|
|
xfs_trans_brelse(tp, agbp);
|
|
}
|
|
|
|
/*
|
|
* Process one of the deferred rmap operations. We pass back the
|
|
* btree cursor to maintain our lock on the rmapbt between calls.
|
|
* This saves time and eliminates a buffer deadlock between the
|
|
* superblock and the AGF because we'll always grab them in the same
|
|
* order.
|
|
*/
|
|
int
|
|
xfs_rmap_finish_one(
|
|
struct xfs_trans *tp,
|
|
enum xfs_rmap_intent_type type,
|
|
__uint64_t owner,
|
|
int whichfork,
|
|
xfs_fileoff_t startoff,
|
|
xfs_fsblock_t startblock,
|
|
xfs_filblks_t blockcount,
|
|
xfs_exntst_t state,
|
|
struct xfs_btree_cur **pcur)
|
|
{
|
|
struct xfs_mount *mp = tp->t_mountp;
|
|
struct xfs_btree_cur *rcur;
|
|
struct xfs_buf *agbp = NULL;
|
|
int error = 0;
|
|
xfs_agnumber_t agno;
|
|
struct xfs_owner_info oinfo;
|
|
xfs_agblock_t bno;
|
|
bool unwritten;
|
|
|
|
agno = XFS_FSB_TO_AGNO(mp, startblock);
|
|
ASSERT(agno != NULLAGNUMBER);
|
|
bno = XFS_FSB_TO_AGBNO(mp, startblock);
|
|
|
|
trace_xfs_rmap_deferred(mp, agno, type, bno, owner, whichfork,
|
|
startoff, blockcount, state);
|
|
|
|
if (XFS_TEST_ERROR(false, mp,
|
|
XFS_ERRTAG_RMAP_FINISH_ONE,
|
|
XFS_RANDOM_RMAP_FINISH_ONE))
|
|
return -EIO;
|
|
|
|
/*
|
|
* If we haven't gotten a cursor or the cursor AG doesn't match
|
|
* the startblock, get one now.
|
|
*/
|
|
rcur = *pcur;
|
|
if (rcur != NULL && rcur->bc_private.a.agno != agno) {
|
|
xfs_rmap_finish_one_cleanup(tp, rcur, 0);
|
|
rcur = NULL;
|
|
*pcur = NULL;
|
|
}
|
|
if (rcur == NULL) {
|
|
/*
|
|
* Refresh the freelist before we start changing the
|
|
* rmapbt, because a shape change could cause us to
|
|
* allocate blocks.
|
|
*/
|
|
error = xfs_free_extent_fix_freelist(tp, agno, &agbp);
|
|
if (error)
|
|
return error;
|
|
if (!agbp)
|
|
return -EFSCORRUPTED;
|
|
|
|
rcur = xfs_rmapbt_init_cursor(mp, tp, agbp, agno);
|
|
if (!rcur) {
|
|
error = -ENOMEM;
|
|
goto out_cur;
|
|
}
|
|
}
|
|
*pcur = rcur;
|
|
|
|
xfs_rmap_ino_owner(&oinfo, owner, whichfork, startoff);
|
|
unwritten = state == XFS_EXT_UNWRITTEN;
|
|
bno = XFS_FSB_TO_AGBNO(rcur->bc_mp, startblock);
|
|
|
|
switch (type) {
|
|
case XFS_RMAP_ALLOC:
|
|
case XFS_RMAP_MAP:
|
|
error = xfs_rmap_map(rcur, bno, blockcount, unwritten, &oinfo);
|
|
break;
|
|
case XFS_RMAP_MAP_SHARED:
|
|
error = xfs_rmap_map_shared(rcur, bno, blockcount, unwritten,
|
|
&oinfo);
|
|
break;
|
|
case XFS_RMAP_FREE:
|
|
case XFS_RMAP_UNMAP:
|
|
error = xfs_rmap_unmap(rcur, bno, blockcount, unwritten,
|
|
&oinfo);
|
|
break;
|
|
case XFS_RMAP_UNMAP_SHARED:
|
|
error = xfs_rmap_unmap_shared(rcur, bno, blockcount, unwritten,
|
|
&oinfo);
|
|
break;
|
|
case XFS_RMAP_CONVERT:
|
|
error = xfs_rmap_convert(rcur, bno, blockcount, !unwritten,
|
|
&oinfo);
|
|
break;
|
|
case XFS_RMAP_CONVERT_SHARED:
|
|
error = xfs_rmap_convert_shared(rcur, bno, blockcount,
|
|
!unwritten, &oinfo);
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
error = -EFSCORRUPTED;
|
|
}
|
|
return error;
|
|
|
|
out_cur:
|
|
xfs_trans_brelse(tp, agbp);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Don't defer an rmap if we aren't an rmap filesystem.
|
|
*/
|
|
static bool
|
|
xfs_rmap_update_is_needed(
|
|
struct xfs_mount *mp,
|
|
int whichfork)
|
|
{
|
|
return xfs_sb_version_hasrmapbt(&mp->m_sb) && whichfork != XFS_COW_FORK;
|
|
}
|
|
|
|
/*
|
|
* Record a rmap intent; the list is kept sorted first by AG and then by
|
|
* increasing age.
|
|
*/
|
|
static int
|
|
__xfs_rmap_add(
|
|
struct xfs_mount *mp,
|
|
struct xfs_defer_ops *dfops,
|
|
enum xfs_rmap_intent_type type,
|
|
__uint64_t owner,
|
|
int whichfork,
|
|
struct xfs_bmbt_irec *bmap)
|
|
{
|
|
struct xfs_rmap_intent *ri;
|
|
|
|
trace_xfs_rmap_defer(mp, XFS_FSB_TO_AGNO(mp, bmap->br_startblock),
|
|
type,
|
|
XFS_FSB_TO_AGBNO(mp, bmap->br_startblock),
|
|
owner, whichfork,
|
|
bmap->br_startoff,
|
|
bmap->br_blockcount,
|
|
bmap->br_state);
|
|
|
|
ri = kmem_alloc(sizeof(struct xfs_rmap_intent), KM_SLEEP | KM_NOFS);
|
|
INIT_LIST_HEAD(&ri->ri_list);
|
|
ri->ri_type = type;
|
|
ri->ri_owner = owner;
|
|
ri->ri_whichfork = whichfork;
|
|
ri->ri_bmap = *bmap;
|
|
|
|
xfs_defer_add(dfops, XFS_DEFER_OPS_TYPE_RMAP, &ri->ri_list);
|
|
return 0;
|
|
}
|
|
|
|
/* Map an extent into a file. */
|
|
int
|
|
xfs_rmap_map_extent(
|
|
struct xfs_mount *mp,
|
|
struct xfs_defer_ops *dfops,
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
struct xfs_bmbt_irec *PREV)
|
|
{
|
|
if (!xfs_rmap_update_is_needed(mp, whichfork))
|
|
return 0;
|
|
|
|
return __xfs_rmap_add(mp, dfops, xfs_is_reflink_inode(ip) ?
|
|
XFS_RMAP_MAP_SHARED : XFS_RMAP_MAP, ip->i_ino,
|
|
whichfork, PREV);
|
|
}
|
|
|
|
/* Unmap an extent out of a file. */
|
|
int
|
|
xfs_rmap_unmap_extent(
|
|
struct xfs_mount *mp,
|
|
struct xfs_defer_ops *dfops,
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
struct xfs_bmbt_irec *PREV)
|
|
{
|
|
if (!xfs_rmap_update_is_needed(mp, whichfork))
|
|
return 0;
|
|
|
|
return __xfs_rmap_add(mp, dfops, xfs_is_reflink_inode(ip) ?
|
|
XFS_RMAP_UNMAP_SHARED : XFS_RMAP_UNMAP, ip->i_ino,
|
|
whichfork, PREV);
|
|
}
|
|
|
|
/* Convert a data fork extent from unwritten to real or vice versa. */
|
|
int
|
|
xfs_rmap_convert_extent(
|
|
struct xfs_mount *mp,
|
|
struct xfs_defer_ops *dfops,
|
|
struct xfs_inode *ip,
|
|
int whichfork,
|
|
struct xfs_bmbt_irec *PREV)
|
|
{
|
|
if (!xfs_rmap_update_is_needed(mp, whichfork))
|
|
return 0;
|
|
|
|
return __xfs_rmap_add(mp, dfops, xfs_is_reflink_inode(ip) ?
|
|
XFS_RMAP_CONVERT_SHARED : XFS_RMAP_CONVERT, ip->i_ino,
|
|
whichfork, PREV);
|
|
}
|
|
|
|
/* Schedule the creation of an rmap for non-file data. */
|
|
int
|
|
xfs_rmap_alloc_extent(
|
|
struct xfs_mount *mp,
|
|
struct xfs_defer_ops *dfops,
|
|
xfs_agnumber_t agno,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len,
|
|
__uint64_t owner)
|
|
{
|
|
struct xfs_bmbt_irec bmap;
|
|
|
|
if (!xfs_rmap_update_is_needed(mp, XFS_DATA_FORK))
|
|
return 0;
|
|
|
|
bmap.br_startblock = XFS_AGB_TO_FSB(mp, agno, bno);
|
|
bmap.br_blockcount = len;
|
|
bmap.br_startoff = 0;
|
|
bmap.br_state = XFS_EXT_NORM;
|
|
|
|
return __xfs_rmap_add(mp, dfops, XFS_RMAP_ALLOC, owner,
|
|
XFS_DATA_FORK, &bmap);
|
|
}
|
|
|
|
/* Schedule the deletion of an rmap for non-file data. */
|
|
int
|
|
xfs_rmap_free_extent(
|
|
struct xfs_mount *mp,
|
|
struct xfs_defer_ops *dfops,
|
|
xfs_agnumber_t agno,
|
|
xfs_agblock_t bno,
|
|
xfs_extlen_t len,
|
|
__uint64_t owner)
|
|
{
|
|
struct xfs_bmbt_irec bmap;
|
|
|
|
if (!xfs_rmap_update_is_needed(mp, XFS_DATA_FORK))
|
|
return 0;
|
|
|
|
bmap.br_startblock = XFS_AGB_TO_FSB(mp, agno, bno);
|
|
bmap.br_blockcount = len;
|
|
bmap.br_startoff = 0;
|
|
bmap.br_state = XFS_EXT_NORM;
|
|
|
|
return __xfs_rmap_add(mp, dfops, XFS_RMAP_FREE, owner,
|
|
XFS_DATA_FORK, &bmap);
|
|
}
|