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637 lines
16 KiB
637 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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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#include "xfs.h" |
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#include "xfs_fs.h" |
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#include "xfs_shared.h" |
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#include "xfs_format.h" |
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#include "xfs_log_format.h" |
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#include "xfs_trans_resv.h" |
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#include "xfs_sb.h" |
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#include "xfs_mount.h" |
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#include "xfs_trans.h" |
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#include "xfs_alloc.h" |
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#include "xfs_btree.h" |
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#include "xfs_btree_staging.h" |
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#include "xfs_rmap.h" |
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#include "xfs_rmap_btree.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_ag_resv.h" |
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|
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/* |
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* Reverse map btree. |
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* |
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* This is a per-ag tree used to track the owner(s) of a given extent. With |
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* reflink it is possible for there to be multiple owners, which is a departure |
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* from classic XFS. Owner records for data extents are inserted when the |
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* extent is mapped and removed when an extent is unmapped. Owner records for |
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* all other block types (i.e. metadata) are inserted when an extent is |
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* allocated and removed when an extent is freed. There can only be one owner |
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* of a metadata extent, usually an inode or some other metadata structure like |
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* an AG btree. |
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* |
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* The rmap btree is part of the free space management, so blocks for the tree |
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* are sourced from the agfl. Hence we need transaction reservation support for |
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* this tree so that the freelist is always large enough. This also impacts on |
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* the minimum space we need to leave free in the AG. |
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* |
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* The tree is ordered by [ag block, owner, offset]. This is a large key size, |
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* but it is the only way to enforce unique keys when a block can be owned by |
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* multiple files at any offset. There's no need to order/search by extent |
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* size for online updating/management of the tree. It is intended that most |
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* reverse lookups will be to find the owner(s) of a particular block, or to |
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* try to recover tree and file data from corrupt primary metadata. |
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*/ |
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|
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static struct xfs_btree_cur * |
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xfs_rmapbt_dup_cursor( |
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struct xfs_btree_cur *cur) |
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{ |
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return xfs_rmapbt_init_cursor(cur->bc_mp, cur->bc_tp, |
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cur->bc_ag.agbp, cur->bc_ag.agno); |
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} |
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STATIC void |
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xfs_rmapbt_set_root( |
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struct xfs_btree_cur *cur, |
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union xfs_btree_ptr *ptr, |
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int inc) |
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{ |
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struct xfs_buf *agbp = cur->bc_ag.agbp; |
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struct xfs_agf *agf = agbp->b_addr; |
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int btnum = cur->bc_btnum; |
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struct xfs_perag *pag = agbp->b_pag; |
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ASSERT(ptr->s != 0); |
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agf->agf_roots[btnum] = ptr->s; |
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be32_add_cpu(&agf->agf_levels[btnum], inc); |
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pag->pagf_levels[btnum] += inc; |
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xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS); |
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} |
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STATIC int |
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xfs_rmapbt_alloc_block( |
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struct xfs_btree_cur *cur, |
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union xfs_btree_ptr *start, |
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union xfs_btree_ptr *new, |
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int *stat) |
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{ |
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struct xfs_buf *agbp = cur->bc_ag.agbp; |
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struct xfs_agf *agf = agbp->b_addr; |
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int error; |
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xfs_agblock_t bno; |
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|
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/* Allocate the new block from the freelist. If we can't, give up. */ |
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error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_ag.agbp, |
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&bno, 1); |
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if (error) |
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return error; |
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trace_xfs_rmapbt_alloc_block(cur->bc_mp, cur->bc_ag.agno, |
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bno, 1); |
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if (bno == NULLAGBLOCK) { |
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*stat = 0; |
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return 0; |
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} |
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xfs_extent_busy_reuse(cur->bc_mp, cur->bc_ag.agno, bno, 1, |
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false); |
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xfs_trans_agbtree_delta(cur->bc_tp, 1); |
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new->s = cpu_to_be32(bno); |
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be32_add_cpu(&agf->agf_rmap_blocks, 1); |
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xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS); |
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xfs_ag_resv_rmapbt_alloc(cur->bc_mp, cur->bc_ag.agno); |
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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_rmapbt_free_block( |
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struct xfs_btree_cur *cur, |
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struct xfs_buf *bp) |
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{ |
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struct xfs_buf *agbp = cur->bc_ag.agbp; |
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struct xfs_agf *agf = agbp->b_addr; |
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struct xfs_perag *pag; |
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xfs_agblock_t bno; |
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int error; |
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bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp)); |
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trace_xfs_rmapbt_free_block(cur->bc_mp, cur->bc_ag.agno, |
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bno, 1); |
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be32_add_cpu(&agf->agf_rmap_blocks, -1); |
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xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS); |
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error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1); |
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if (error) |
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return error; |
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xfs_extent_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1, |
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XFS_EXTENT_BUSY_SKIP_DISCARD); |
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xfs_trans_agbtree_delta(cur->bc_tp, -1); |
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pag = cur->bc_ag.agbp->b_pag; |
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xfs_ag_resv_free_extent(pag, XFS_AG_RESV_RMAPBT, NULL, 1); |
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return 0; |
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} |
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STATIC int |
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xfs_rmapbt_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_rmap_mnr[level != 0]; |
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} |
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STATIC int |
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xfs_rmapbt_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_rmap_mxr[level != 0]; |
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} |
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STATIC void |
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xfs_rmapbt_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->rmap.rm_startblock = rec->rmap.rm_startblock; |
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key->rmap.rm_owner = rec->rmap.rm_owner; |
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key->rmap.rm_offset = rec->rmap.rm_offset; |
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} |
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/* |
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* The high key for a reverse mapping record can be computed by shifting |
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* the startblock and offset to the highest value that would still map |
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* to that record. In practice this means that we add blockcount-1 to |
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* the startblock for all records, and if the record is for a data/attr |
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* fork mapping, we add blockcount-1 to the offset too. |
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*/ |
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STATIC void |
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xfs_rmapbt_init_high_key_from_rec( |
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union xfs_btree_key *key, |
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union xfs_btree_rec *rec) |
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{ |
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uint64_t off; |
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int adj; |
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adj = be32_to_cpu(rec->rmap.rm_blockcount) - 1; |
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key->rmap.rm_startblock = rec->rmap.rm_startblock; |
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be32_add_cpu(&key->rmap.rm_startblock, adj); |
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key->rmap.rm_owner = rec->rmap.rm_owner; |
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key->rmap.rm_offset = rec->rmap.rm_offset; |
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if (XFS_RMAP_NON_INODE_OWNER(be64_to_cpu(rec->rmap.rm_owner)) || |
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XFS_RMAP_IS_BMBT_BLOCK(be64_to_cpu(rec->rmap.rm_offset))) |
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return; |
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off = be64_to_cpu(key->rmap.rm_offset); |
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off = (XFS_RMAP_OFF(off) + adj) | (off & ~XFS_RMAP_OFF_MASK); |
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key->rmap.rm_offset = cpu_to_be64(off); |
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} |
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STATIC void |
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xfs_rmapbt_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->rmap.rm_startblock = cpu_to_be32(cur->bc_rec.r.rm_startblock); |
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rec->rmap.rm_blockcount = cpu_to_be32(cur->bc_rec.r.rm_blockcount); |
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rec->rmap.rm_owner = cpu_to_be64(cur->bc_rec.r.rm_owner); |
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rec->rmap.rm_offset = cpu_to_be64( |
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xfs_rmap_irec_offset_pack(&cur->bc_rec.r)); |
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} |
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STATIC void |
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xfs_rmapbt_init_ptr_from_cur( |
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struct xfs_btree_cur *cur, |
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union xfs_btree_ptr *ptr) |
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{ |
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struct xfs_agf *agf = cur->bc_ag.agbp->b_addr; |
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ASSERT(cur->bc_ag.agno == be32_to_cpu(agf->agf_seqno)); |
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ptr->s = agf->agf_roots[cur->bc_btnum]; |
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} |
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STATIC int64_t |
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xfs_rmapbt_key_diff( |
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struct xfs_btree_cur *cur, |
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union xfs_btree_key *key) |
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{ |
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struct xfs_rmap_irec *rec = &cur->bc_rec.r; |
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struct xfs_rmap_key *kp = &key->rmap; |
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__u64 x, y; |
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int64_t d; |
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d = (int64_t)be32_to_cpu(kp->rm_startblock) - rec->rm_startblock; |
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if (d) |
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return d; |
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x = be64_to_cpu(kp->rm_owner); |
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y = rec->rm_owner; |
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if (x > y) |
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return 1; |
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else if (y > x) |
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return -1; |
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x = XFS_RMAP_OFF(be64_to_cpu(kp->rm_offset)); |
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y = rec->rm_offset; |
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if (x > y) |
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return 1; |
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else if (y > x) |
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return -1; |
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return 0; |
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} |
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STATIC int64_t |
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xfs_rmapbt_diff_two_keys( |
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struct xfs_btree_cur *cur, |
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union xfs_btree_key *k1, |
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union xfs_btree_key *k2) |
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{ |
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struct xfs_rmap_key *kp1 = &k1->rmap; |
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struct xfs_rmap_key *kp2 = &k2->rmap; |
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int64_t d; |
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__u64 x, y; |
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d = (int64_t)be32_to_cpu(kp1->rm_startblock) - |
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be32_to_cpu(kp2->rm_startblock); |
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if (d) |
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return d; |
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x = be64_to_cpu(kp1->rm_owner); |
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y = be64_to_cpu(kp2->rm_owner); |
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if (x > y) |
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return 1; |
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else if (y > x) |
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return -1; |
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x = XFS_RMAP_OFF(be64_to_cpu(kp1->rm_offset)); |
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y = XFS_RMAP_OFF(be64_to_cpu(kp2->rm_offset)); |
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if (x > y) |
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return 1; |
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else if (y > x) |
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return -1; |
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return 0; |
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} |
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static xfs_failaddr_t |
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xfs_rmapbt_verify( |
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struct xfs_buf *bp) |
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{ |
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struct xfs_mount *mp = bp->b_mount; |
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struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); |
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struct xfs_perag *pag = bp->b_pag; |
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xfs_failaddr_t fa; |
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unsigned int level; |
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|
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/* |
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* magic number and level verification |
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* |
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* During growfs operations, we can't verify the exact level or owner as |
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* the perag is not fully initialised and hence not attached to the |
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* buffer. In this case, check against the maximum tree depth. |
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* |
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* Similarly, during log recovery we will have a perag structure |
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* attached, but the agf information will not yet have been initialised |
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* from the on disk AGF. Again, we can only check against maximum limits |
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* in this case. |
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*/ |
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if (!xfs_verify_magic(bp, block->bb_magic)) |
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return __this_address; |
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if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) |
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return __this_address; |
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fa = xfs_btree_sblock_v5hdr_verify(bp); |
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if (fa) |
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return fa; |
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level = be16_to_cpu(block->bb_level); |
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if (pag && pag->pagf_init) { |
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if (level >= pag->pagf_levels[XFS_BTNUM_RMAPi]) |
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return __this_address; |
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} else if (level >= mp->m_rmap_maxlevels) |
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return __this_address; |
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return xfs_btree_sblock_verify(bp, mp->m_rmap_mxr[level != 0]); |
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} |
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static void |
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xfs_rmapbt_read_verify( |
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struct xfs_buf *bp) |
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{ |
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xfs_failaddr_t fa; |
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if (!xfs_btree_sblock_verify_crc(bp)) |
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xfs_verifier_error(bp, -EFSBADCRC, __this_address); |
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else { |
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fa = xfs_rmapbt_verify(bp); |
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if (fa) |
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xfs_verifier_error(bp, -EFSCORRUPTED, fa); |
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} |
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if (bp->b_error) |
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trace_xfs_btree_corrupt(bp, _RET_IP_); |
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} |
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static void |
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xfs_rmapbt_write_verify( |
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struct xfs_buf *bp) |
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{ |
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xfs_failaddr_t fa; |
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fa = xfs_rmapbt_verify(bp); |
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if (fa) { |
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trace_xfs_btree_corrupt(bp, _RET_IP_); |
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xfs_verifier_error(bp, -EFSCORRUPTED, fa); |
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return; |
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} |
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xfs_btree_sblock_calc_crc(bp); |
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} |
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const struct xfs_buf_ops xfs_rmapbt_buf_ops = { |
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.name = "xfs_rmapbt", |
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.magic = { 0, cpu_to_be32(XFS_RMAP_CRC_MAGIC) }, |
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.verify_read = xfs_rmapbt_read_verify, |
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.verify_write = xfs_rmapbt_write_verify, |
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.verify_struct = xfs_rmapbt_verify, |
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}; |
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STATIC int |
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xfs_rmapbt_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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uint32_t x; |
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uint32_t y; |
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uint64_t a; |
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uint64_t b; |
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x = be32_to_cpu(k1->rmap.rm_startblock); |
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y = be32_to_cpu(k2->rmap.rm_startblock); |
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if (x < y) |
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return 1; |
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else if (x > y) |
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return 0; |
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a = be64_to_cpu(k1->rmap.rm_owner); |
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b = be64_to_cpu(k2->rmap.rm_owner); |
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if (a < b) |
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return 1; |
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else if (a > b) |
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return 0; |
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a = XFS_RMAP_OFF(be64_to_cpu(k1->rmap.rm_offset)); |
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b = XFS_RMAP_OFF(be64_to_cpu(k2->rmap.rm_offset)); |
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if (a <= b) |
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return 1; |
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return 0; |
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} |
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STATIC int |
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xfs_rmapbt_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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uint32_t x; |
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uint32_t y; |
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uint64_t a; |
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uint64_t b; |
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x = be32_to_cpu(r1->rmap.rm_startblock); |
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y = be32_to_cpu(r2->rmap.rm_startblock); |
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if (x < y) |
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return 1; |
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else if (x > y) |
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return 0; |
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a = be64_to_cpu(r1->rmap.rm_owner); |
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b = be64_to_cpu(r2->rmap.rm_owner); |
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if (a < b) |
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return 1; |
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else if (a > b) |
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return 0; |
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a = XFS_RMAP_OFF(be64_to_cpu(r1->rmap.rm_offset)); |
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b = XFS_RMAP_OFF(be64_to_cpu(r2->rmap.rm_offset)); |
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if (a <= b) |
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return 1; |
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return 0; |
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} |
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|
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static const struct xfs_btree_ops xfs_rmapbt_ops = { |
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.rec_len = sizeof(struct xfs_rmap_rec), |
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.key_len = 2 * sizeof(struct xfs_rmap_key), |
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|
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.dup_cursor = xfs_rmapbt_dup_cursor, |
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.set_root = xfs_rmapbt_set_root, |
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.alloc_block = xfs_rmapbt_alloc_block, |
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.free_block = xfs_rmapbt_free_block, |
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.get_minrecs = xfs_rmapbt_get_minrecs, |
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.get_maxrecs = xfs_rmapbt_get_maxrecs, |
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.init_key_from_rec = xfs_rmapbt_init_key_from_rec, |
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.init_high_key_from_rec = xfs_rmapbt_init_high_key_from_rec, |
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.init_rec_from_cur = xfs_rmapbt_init_rec_from_cur, |
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.init_ptr_from_cur = xfs_rmapbt_init_ptr_from_cur, |
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.key_diff = xfs_rmapbt_key_diff, |
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.buf_ops = &xfs_rmapbt_buf_ops, |
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.diff_two_keys = xfs_rmapbt_diff_two_keys, |
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.keys_inorder = xfs_rmapbt_keys_inorder, |
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.recs_inorder = xfs_rmapbt_recs_inorder, |
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}; |
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|
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static struct xfs_btree_cur * |
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xfs_rmapbt_init_common( |
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struct xfs_mount *mp, |
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struct xfs_trans *tp, |
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xfs_agnumber_t agno) |
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{ |
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struct xfs_btree_cur *cur; |
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cur = kmem_cache_zalloc(xfs_btree_cur_zone, GFP_NOFS | __GFP_NOFAIL); |
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cur->bc_tp = tp; |
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cur->bc_mp = mp; |
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/* Overlapping btree; 2 keys per pointer. */ |
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cur->bc_btnum = XFS_BTNUM_RMAP; |
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cur->bc_flags = XFS_BTREE_CRC_BLOCKS | XFS_BTREE_OVERLAPPING; |
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cur->bc_blocklog = mp->m_sb.sb_blocklog; |
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cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_rmap_2); |
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cur->bc_ag.agno = agno; |
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cur->bc_ops = &xfs_rmapbt_ops; |
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return cur; |
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} |
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/* Create a new reverse mapping btree cursor. */ |
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struct xfs_btree_cur * |
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xfs_rmapbt_init_cursor( |
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struct xfs_mount *mp, |
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struct xfs_trans *tp, |
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struct xfs_buf *agbp, |
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xfs_agnumber_t agno) |
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{ |
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struct xfs_agf *agf = agbp->b_addr; |
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struct xfs_btree_cur *cur; |
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cur = xfs_rmapbt_init_common(mp, tp, agno); |
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cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]); |
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cur->bc_ag.agbp = agbp; |
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return cur; |
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} |
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/* Create a new reverse mapping btree cursor with a fake root for staging. */ |
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struct xfs_btree_cur * |
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xfs_rmapbt_stage_cursor( |
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struct xfs_mount *mp, |
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struct xbtree_afakeroot *afake, |
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xfs_agnumber_t agno) |
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{ |
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struct xfs_btree_cur *cur; |
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|
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cur = xfs_rmapbt_init_common(mp, NULL, agno); |
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xfs_btree_stage_afakeroot(cur, afake); |
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return cur; |
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} |
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|
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/* |
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* Install a new reverse mapping btree root. Caller is responsible for |
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* invalidating and freeing the old btree blocks. |
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*/ |
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void |
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xfs_rmapbt_commit_staged_btree( |
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struct xfs_btree_cur *cur, |
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struct xfs_trans *tp, |
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struct xfs_buf *agbp) |
|
{ |
|
struct xfs_agf *agf = agbp->b_addr; |
|
struct xbtree_afakeroot *afake = cur->bc_ag.afake; |
|
|
|
ASSERT(cur->bc_flags & XFS_BTREE_STAGING); |
|
|
|
agf->agf_roots[cur->bc_btnum] = cpu_to_be32(afake->af_root); |
|
agf->agf_levels[cur->bc_btnum] = cpu_to_be32(afake->af_levels); |
|
agf->agf_rmap_blocks = cpu_to_be32(afake->af_blocks); |
|
xfs_alloc_log_agf(tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS | |
|
XFS_AGF_RMAP_BLOCKS); |
|
xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_rmapbt_ops); |
|
} |
|
|
|
/* |
|
* Calculate number of records in an rmap btree block. |
|
*/ |
|
int |
|
xfs_rmapbt_maxrecs( |
|
int blocklen, |
|
int leaf) |
|
{ |
|
blocklen -= XFS_RMAP_BLOCK_LEN; |
|
|
|
if (leaf) |
|
return blocklen / sizeof(struct xfs_rmap_rec); |
|
return blocklen / |
|
(2 * sizeof(struct xfs_rmap_key) + sizeof(xfs_rmap_ptr_t)); |
|
} |
|
|
|
/* Compute the maximum height of an rmap btree. */ |
|
void |
|
xfs_rmapbt_compute_maxlevels( |
|
struct xfs_mount *mp) |
|
{ |
|
/* |
|
* On a non-reflink filesystem, the maximum number of rmap |
|
* records is the number of blocks in the AG, hence the max |
|
* rmapbt height is log_$maxrecs($agblocks). However, with |
|
* reflink each AG block can have up to 2^32 (per the refcount |
|
* record format) owners, which means that theoretically we |
|
* could face up to 2^64 rmap records. |
|
* |
|
* That effectively means that the max rmapbt height must be |
|
* XFS_BTREE_MAXLEVELS. "Fortunately" we'll run out of AG |
|
* blocks to feed the rmapbt long before the rmapbt reaches |
|
* maximum height. The reflink code uses ag_resv_critical to |
|
* disallow reflinking when less than 10% of the per-AG metadata |
|
* block reservation since the fallback is a regular file copy. |
|
*/ |
|
if (xfs_sb_version_hasreflink(&mp->m_sb)) |
|
mp->m_rmap_maxlevels = XFS_BTREE_MAXLEVELS; |
|
else |
|
mp->m_rmap_maxlevels = xfs_btree_compute_maxlevels( |
|
mp->m_rmap_mnr, mp->m_sb.sb_agblocks); |
|
} |
|
|
|
/* Calculate the refcount btree size for some records. */ |
|
xfs_extlen_t |
|
xfs_rmapbt_calc_size( |
|
struct xfs_mount *mp, |
|
unsigned long long len) |
|
{ |
|
return xfs_btree_calc_size(mp->m_rmap_mnr, len); |
|
} |
|
|
|
/* |
|
* Calculate the maximum refcount btree size. |
|
*/ |
|
xfs_extlen_t |
|
xfs_rmapbt_max_size( |
|
struct xfs_mount *mp, |
|
xfs_agblock_t agblocks) |
|
{ |
|
/* Bail out if we're uninitialized, which can happen in mkfs. */ |
|
if (mp->m_rmap_mxr[0] == 0) |
|
return 0; |
|
|
|
return xfs_rmapbt_calc_size(mp, agblocks); |
|
} |
|
|
|
/* |
|
* Figure out how many blocks to reserve and how many are used by this btree. |
|
*/ |
|
int |
|
xfs_rmapbt_calc_reserves( |
|
struct xfs_mount *mp, |
|
struct xfs_trans *tp, |
|
xfs_agnumber_t agno, |
|
xfs_extlen_t *ask, |
|
xfs_extlen_t *used) |
|
{ |
|
struct xfs_buf *agbp; |
|
struct xfs_agf *agf; |
|
xfs_agblock_t agblocks; |
|
xfs_extlen_t tree_len; |
|
int error; |
|
|
|
if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) |
|
return 0; |
|
|
|
error = xfs_alloc_read_agf(mp, tp, agno, 0, &agbp); |
|
if (error) |
|
return error; |
|
|
|
agf = agbp->b_addr; |
|
agblocks = be32_to_cpu(agf->agf_length); |
|
tree_len = be32_to_cpu(agf->agf_rmap_blocks); |
|
xfs_trans_brelse(tp, agbp); |
|
|
|
/* |
|
* The log is permanently allocated, so the space it occupies will |
|
* never be available for the kinds of things that would require btree |
|
* expansion. We therefore can pretend the space isn't there. |
|
*/ |
|
if (mp->m_sb.sb_logstart && |
|
XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart) == agno) |
|
agblocks -= mp->m_sb.sb_logblocks; |
|
|
|
/* Reserve 1% of the AG or enough for 1 block per record. */ |
|
*ask += max(agblocks / 100, xfs_rmapbt_max_size(mp, agblocks)); |
|
*used += tree_len; |
|
|
|
return error; |
|
}
|
|
|