10b61f8a4SDave Chinner // SPDX-License-Identifier: GPL-2.0 2035e00acSDarrick J. Wong /* 3035e00acSDarrick J. Wong * Copyright (c) 2014 Red Hat, Inc. 4035e00acSDarrick J. Wong * All Rights Reserved. 5035e00acSDarrick J. Wong */ 6035e00acSDarrick J. Wong #include "xfs.h" 7035e00acSDarrick J. Wong #include "xfs_fs.h" 8035e00acSDarrick J. Wong #include "xfs_shared.h" 9035e00acSDarrick J. Wong #include "xfs_format.h" 10035e00acSDarrick J. Wong #include "xfs_log_format.h" 11035e00acSDarrick J. Wong #include "xfs_trans_resv.h" 12035e00acSDarrick J. Wong #include "xfs_bit.h" 13035e00acSDarrick J. Wong #include "xfs_sb.h" 14035e00acSDarrick J. Wong #include "xfs_mount.h" 15035e00acSDarrick J. Wong #include "xfs_defer.h" 16035e00acSDarrick J. Wong #include "xfs_inode.h" 17035e00acSDarrick J. Wong #include "xfs_trans.h" 18035e00acSDarrick J. Wong #include "xfs_alloc.h" 19035e00acSDarrick J. Wong #include "xfs_btree.h" 204b8ed677SDarrick J. Wong #include "xfs_rmap.h" 21035e00acSDarrick J. Wong #include "xfs_rmap_btree.h" 22035e00acSDarrick J. Wong #include "xfs_trace.h" 23035e00acSDarrick J. Wong #include "xfs_cksum.h" 24035e00acSDarrick J. Wong #include "xfs_error.h" 25035e00acSDarrick J. Wong #include "xfs_extent_busy.h" 2684d69619SDarrick J. Wong #include "xfs_ag_resv.h" 27035e00acSDarrick J. Wong 284b8ed677SDarrick J. Wong /* 294b8ed677SDarrick J. Wong * Reverse map btree. 304b8ed677SDarrick J. Wong * 314b8ed677SDarrick J. Wong * This is a per-ag tree used to track the owner(s) of a given extent. With 324b8ed677SDarrick J. Wong * reflink it is possible for there to be multiple owners, which is a departure 334b8ed677SDarrick J. Wong * from classic XFS. Owner records for data extents are inserted when the 344b8ed677SDarrick J. Wong * extent is mapped and removed when an extent is unmapped. Owner records for 354b8ed677SDarrick J. Wong * all other block types (i.e. metadata) are inserted when an extent is 364b8ed677SDarrick J. Wong * allocated and removed when an extent is freed. There can only be one owner 374b8ed677SDarrick J. Wong * of a metadata extent, usually an inode or some other metadata structure like 384b8ed677SDarrick J. Wong * an AG btree. 394b8ed677SDarrick J. Wong * 404b8ed677SDarrick J. Wong * The rmap btree is part of the free space management, so blocks for the tree 414b8ed677SDarrick J. Wong * are sourced from the agfl. Hence we need transaction reservation support for 424b8ed677SDarrick J. Wong * this tree so that the freelist is always large enough. This also impacts on 434b8ed677SDarrick J. Wong * the minimum space we need to leave free in the AG. 444b8ed677SDarrick J. Wong * 454b8ed677SDarrick J. Wong * The tree is ordered by [ag block, owner, offset]. This is a large key size, 464b8ed677SDarrick J. Wong * but it is the only way to enforce unique keys when a block can be owned by 474b8ed677SDarrick J. Wong * multiple files at any offset. There's no need to order/search by extent 484b8ed677SDarrick J. Wong * size for online updating/management of the tree. It is intended that most 494b8ed677SDarrick J. Wong * reverse lookups will be to find the owner(s) of a particular block, or to 504b8ed677SDarrick J. Wong * try to recover tree and file data from corrupt primary metadata. 514b8ed677SDarrick J. Wong */ 524b8ed677SDarrick J. Wong 53035e00acSDarrick J. Wong static struct xfs_btree_cur * 54035e00acSDarrick J. Wong xfs_rmapbt_dup_cursor( 55035e00acSDarrick J. Wong struct xfs_btree_cur *cur) 56035e00acSDarrick J. Wong { 57035e00acSDarrick J. Wong return xfs_rmapbt_init_cursor(cur->bc_mp, cur->bc_tp, 58035e00acSDarrick J. Wong cur->bc_private.a.agbp, cur->bc_private.a.agno); 59035e00acSDarrick J. Wong } 60035e00acSDarrick J. Wong 614b8ed677SDarrick J. Wong STATIC void 624b8ed677SDarrick J. Wong xfs_rmapbt_set_root( 634b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 644b8ed677SDarrick J. Wong union xfs_btree_ptr *ptr, 654b8ed677SDarrick J. Wong int inc) 664b8ed677SDarrick J. Wong { 674b8ed677SDarrick J. Wong struct xfs_buf *agbp = cur->bc_private.a.agbp; 684b8ed677SDarrick J. Wong struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); 694b8ed677SDarrick J. Wong xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno); 704b8ed677SDarrick J. Wong int btnum = cur->bc_btnum; 714b8ed677SDarrick J. Wong struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno); 724b8ed677SDarrick J. Wong 734b8ed677SDarrick J. Wong ASSERT(ptr->s != 0); 744b8ed677SDarrick J. Wong 754b8ed677SDarrick J. Wong agf->agf_roots[btnum] = ptr->s; 764b8ed677SDarrick J. Wong be32_add_cpu(&agf->agf_levels[btnum], inc); 774b8ed677SDarrick J. Wong pag->pagf_levels[btnum] += inc; 784b8ed677SDarrick J. Wong xfs_perag_put(pag); 794b8ed677SDarrick J. Wong 804b8ed677SDarrick J. Wong xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS); 814b8ed677SDarrick J. Wong } 824b8ed677SDarrick J. Wong 834b8ed677SDarrick J. Wong STATIC int 844b8ed677SDarrick J. Wong xfs_rmapbt_alloc_block( 854b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 864b8ed677SDarrick J. Wong union xfs_btree_ptr *start, 874b8ed677SDarrick J. Wong union xfs_btree_ptr *new, 884b8ed677SDarrick J. Wong int *stat) 894b8ed677SDarrick J. Wong { 90f32866fdSDarrick J. Wong struct xfs_buf *agbp = cur->bc_private.a.agbp; 91f32866fdSDarrick J. Wong struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); 924b8ed677SDarrick J. Wong int error; 934b8ed677SDarrick J. Wong xfs_agblock_t bno; 944b8ed677SDarrick J. Wong 954b8ed677SDarrick J. Wong /* Allocate the new block from the freelist. If we can't, give up. */ 964b8ed677SDarrick J. Wong error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp, 974b8ed677SDarrick J. Wong &bno, 1); 98e157ebdcSCarlos Maiolino if (error) 994b8ed677SDarrick J. Wong return error; 1004b8ed677SDarrick J. Wong 1014b8ed677SDarrick J. Wong trace_xfs_rmapbt_alloc_block(cur->bc_mp, cur->bc_private.a.agno, 1024b8ed677SDarrick J. Wong bno, 1); 1034b8ed677SDarrick J. Wong if (bno == NULLAGBLOCK) { 1044b8ed677SDarrick J. Wong *stat = 0; 1054b8ed677SDarrick J. Wong return 0; 1064b8ed677SDarrick J. Wong } 1074b8ed677SDarrick J. Wong 1084b8ed677SDarrick J. Wong xfs_extent_busy_reuse(cur->bc_mp, cur->bc_private.a.agno, bno, 1, 1094b8ed677SDarrick J. Wong false); 1104b8ed677SDarrick J. Wong 1114b8ed677SDarrick J. Wong xfs_trans_agbtree_delta(cur->bc_tp, 1); 1124b8ed677SDarrick J. Wong new->s = cpu_to_be32(bno); 113f32866fdSDarrick J. Wong be32_add_cpu(&agf->agf_rmap_blocks, 1); 114f32866fdSDarrick J. Wong xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS); 1154b8ed677SDarrick J. Wong 1160ab32086SBrian Foster xfs_ag_resv_rmapbt_alloc(cur->bc_mp, cur->bc_private.a.agno); 1170ab32086SBrian Foster 1184b8ed677SDarrick J. Wong *stat = 1; 1194b8ed677SDarrick J. Wong return 0; 1204b8ed677SDarrick J. Wong } 1214b8ed677SDarrick J. Wong 1224b8ed677SDarrick J. Wong STATIC int 1234b8ed677SDarrick J. Wong xfs_rmapbt_free_block( 1244b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 1254b8ed677SDarrick J. Wong struct xfs_buf *bp) 1264b8ed677SDarrick J. Wong { 1274b8ed677SDarrick J. Wong struct xfs_buf *agbp = cur->bc_private.a.agbp; 1284b8ed677SDarrick J. Wong struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); 1294b8ed677SDarrick J. Wong xfs_agblock_t bno; 1304b8ed677SDarrick J. Wong int error; 1314b8ed677SDarrick J. Wong 1324b8ed677SDarrick J. Wong bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp)); 1334b8ed677SDarrick J. Wong trace_xfs_rmapbt_free_block(cur->bc_mp, cur->bc_private.a.agno, 1344b8ed677SDarrick J. Wong bno, 1); 135f32866fdSDarrick J. Wong be32_add_cpu(&agf->agf_rmap_blocks, -1); 136f32866fdSDarrick J. Wong xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS); 1374b8ed677SDarrick J. Wong error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1); 1384b8ed677SDarrick J. Wong if (error) 1394b8ed677SDarrick J. Wong return error; 1404b8ed677SDarrick J. Wong 1414b8ed677SDarrick J. Wong xfs_extent_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1, 1424b8ed677SDarrick J. Wong XFS_EXTENT_BUSY_SKIP_DISCARD); 1434b8ed677SDarrick J. Wong xfs_trans_agbtree_delta(cur->bc_tp, -1); 1444b8ed677SDarrick J. Wong 1450ab32086SBrian Foster xfs_ag_resv_rmapbt_free(cur->bc_mp, cur->bc_private.a.agno); 1460ab32086SBrian Foster 1474b8ed677SDarrick J. Wong return 0; 1484b8ed677SDarrick J. Wong } 1494b8ed677SDarrick J. Wong 1504b8ed677SDarrick J. Wong STATIC int 1514b8ed677SDarrick J. Wong xfs_rmapbt_get_minrecs( 1524b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 1534b8ed677SDarrick J. Wong int level) 1544b8ed677SDarrick J. Wong { 1554b8ed677SDarrick J. Wong return cur->bc_mp->m_rmap_mnr[level != 0]; 1564b8ed677SDarrick J. Wong } 1574b8ed677SDarrick J. Wong 1584b8ed677SDarrick J. Wong STATIC int 1594b8ed677SDarrick J. Wong xfs_rmapbt_get_maxrecs( 1604b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 1614b8ed677SDarrick J. Wong int level) 1624b8ed677SDarrick J. Wong { 1634b8ed677SDarrick J. Wong return cur->bc_mp->m_rmap_mxr[level != 0]; 1644b8ed677SDarrick J. Wong } 1654b8ed677SDarrick J. Wong 1664b8ed677SDarrick J. Wong STATIC void 1674b8ed677SDarrick J. Wong xfs_rmapbt_init_key_from_rec( 1684b8ed677SDarrick J. Wong union xfs_btree_key *key, 1694b8ed677SDarrick J. Wong union xfs_btree_rec *rec) 1704b8ed677SDarrick J. Wong { 1714b8ed677SDarrick J. Wong key->rmap.rm_startblock = rec->rmap.rm_startblock; 1724b8ed677SDarrick J. Wong key->rmap.rm_owner = rec->rmap.rm_owner; 1734b8ed677SDarrick J. Wong key->rmap.rm_offset = rec->rmap.rm_offset; 1744b8ed677SDarrick J. Wong } 1754b8ed677SDarrick J. Wong 176cfed56aeSDarrick J. Wong /* 177cfed56aeSDarrick J. Wong * The high key for a reverse mapping record can be computed by shifting 178cfed56aeSDarrick J. Wong * the startblock and offset to the highest value that would still map 179cfed56aeSDarrick J. Wong * to that record. In practice this means that we add blockcount-1 to 180cfed56aeSDarrick J. Wong * the startblock for all records, and if the record is for a data/attr 181cfed56aeSDarrick J. Wong * fork mapping, we add blockcount-1 to the offset too. 182cfed56aeSDarrick J. Wong */ 183cfed56aeSDarrick J. Wong STATIC void 184cfed56aeSDarrick J. Wong xfs_rmapbt_init_high_key_from_rec( 185cfed56aeSDarrick J. Wong union xfs_btree_key *key, 186cfed56aeSDarrick J. Wong union xfs_btree_rec *rec) 187cfed56aeSDarrick J. Wong { 188c8ce540dSDarrick J. Wong uint64_t off; 189cfed56aeSDarrick J. Wong int adj; 190cfed56aeSDarrick J. Wong 191cfed56aeSDarrick J. Wong adj = be32_to_cpu(rec->rmap.rm_blockcount) - 1; 192cfed56aeSDarrick J. Wong 193cfed56aeSDarrick J. Wong key->rmap.rm_startblock = rec->rmap.rm_startblock; 194cfed56aeSDarrick J. Wong be32_add_cpu(&key->rmap.rm_startblock, adj); 195cfed56aeSDarrick J. Wong key->rmap.rm_owner = rec->rmap.rm_owner; 196cfed56aeSDarrick J. Wong key->rmap.rm_offset = rec->rmap.rm_offset; 197cfed56aeSDarrick J. Wong if (XFS_RMAP_NON_INODE_OWNER(be64_to_cpu(rec->rmap.rm_owner)) || 198cfed56aeSDarrick J. Wong XFS_RMAP_IS_BMBT_BLOCK(be64_to_cpu(rec->rmap.rm_offset))) 199cfed56aeSDarrick J. Wong return; 200cfed56aeSDarrick J. Wong off = be64_to_cpu(key->rmap.rm_offset); 201cfed56aeSDarrick J. Wong off = (XFS_RMAP_OFF(off) + adj) | (off & ~XFS_RMAP_OFF_MASK); 202cfed56aeSDarrick J. Wong key->rmap.rm_offset = cpu_to_be64(off); 203cfed56aeSDarrick J. Wong } 204cfed56aeSDarrick J. Wong 2054b8ed677SDarrick J. Wong STATIC void 2064b8ed677SDarrick J. Wong xfs_rmapbt_init_rec_from_cur( 2074b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 2084b8ed677SDarrick J. Wong union xfs_btree_rec *rec) 2094b8ed677SDarrick J. Wong { 2104b8ed677SDarrick J. Wong rec->rmap.rm_startblock = cpu_to_be32(cur->bc_rec.r.rm_startblock); 2114b8ed677SDarrick J. Wong rec->rmap.rm_blockcount = cpu_to_be32(cur->bc_rec.r.rm_blockcount); 2124b8ed677SDarrick J. Wong rec->rmap.rm_owner = cpu_to_be64(cur->bc_rec.r.rm_owner); 2134b8ed677SDarrick J. Wong rec->rmap.rm_offset = cpu_to_be64( 2144b8ed677SDarrick J. Wong xfs_rmap_irec_offset_pack(&cur->bc_rec.r)); 2154b8ed677SDarrick J. Wong } 2164b8ed677SDarrick J. Wong 2174b8ed677SDarrick J. Wong STATIC void 2184b8ed677SDarrick J. Wong xfs_rmapbt_init_ptr_from_cur( 2194b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 2204b8ed677SDarrick J. Wong union xfs_btree_ptr *ptr) 2214b8ed677SDarrick J. Wong { 2224b8ed677SDarrick J. Wong struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp); 2234b8ed677SDarrick J. Wong 2244b8ed677SDarrick J. Wong ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno)); 2254b8ed677SDarrick J. Wong 2264b8ed677SDarrick J. Wong ptr->s = agf->agf_roots[cur->bc_btnum]; 2274b8ed677SDarrick J. Wong } 2284b8ed677SDarrick J. Wong 229c8ce540dSDarrick J. Wong STATIC int64_t 2304b8ed677SDarrick J. Wong xfs_rmapbt_key_diff( 2314b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 2324b8ed677SDarrick J. Wong union xfs_btree_key *key) 2334b8ed677SDarrick J. Wong { 2344b8ed677SDarrick J. Wong struct xfs_rmap_irec *rec = &cur->bc_rec.r; 2354b8ed677SDarrick J. Wong struct xfs_rmap_key *kp = &key->rmap; 2364b8ed677SDarrick J. Wong __u64 x, y; 237c8ce540dSDarrick J. Wong int64_t d; 2384b8ed677SDarrick J. Wong 239c8ce540dSDarrick J. Wong d = (int64_t)be32_to_cpu(kp->rm_startblock) - rec->rm_startblock; 2404b8ed677SDarrick J. Wong if (d) 2414b8ed677SDarrick J. Wong return d; 2424b8ed677SDarrick J. Wong 2434b8ed677SDarrick J. Wong x = be64_to_cpu(kp->rm_owner); 2444b8ed677SDarrick J. Wong y = rec->rm_owner; 2454b8ed677SDarrick J. Wong if (x > y) 2464b8ed677SDarrick J. Wong return 1; 2474b8ed677SDarrick J. Wong else if (y > x) 2484b8ed677SDarrick J. Wong return -1; 2494b8ed677SDarrick J. Wong 2504b8ed677SDarrick J. Wong x = XFS_RMAP_OFF(be64_to_cpu(kp->rm_offset)); 2514b8ed677SDarrick J. Wong y = rec->rm_offset; 2524b8ed677SDarrick J. Wong if (x > y) 2534b8ed677SDarrick J. Wong return 1; 2544b8ed677SDarrick J. Wong else if (y > x) 2554b8ed677SDarrick J. Wong return -1; 2564b8ed677SDarrick J. Wong return 0; 2574b8ed677SDarrick J. Wong } 2584b8ed677SDarrick J. Wong 259c8ce540dSDarrick J. Wong STATIC int64_t 260cfed56aeSDarrick J. Wong xfs_rmapbt_diff_two_keys( 261cfed56aeSDarrick J. Wong struct xfs_btree_cur *cur, 262cfed56aeSDarrick J. Wong union xfs_btree_key *k1, 263cfed56aeSDarrick J. Wong union xfs_btree_key *k2) 264cfed56aeSDarrick J. Wong { 265cfed56aeSDarrick J. Wong struct xfs_rmap_key *kp1 = &k1->rmap; 266cfed56aeSDarrick J. Wong struct xfs_rmap_key *kp2 = &k2->rmap; 267c8ce540dSDarrick J. Wong int64_t d; 268cfed56aeSDarrick J. Wong __u64 x, y; 269cfed56aeSDarrick J. Wong 270c8ce540dSDarrick J. Wong d = (int64_t)be32_to_cpu(kp1->rm_startblock) - 271cfed56aeSDarrick J. Wong be32_to_cpu(kp2->rm_startblock); 272cfed56aeSDarrick J. Wong if (d) 273cfed56aeSDarrick J. Wong return d; 274cfed56aeSDarrick J. Wong 275cfed56aeSDarrick J. Wong x = be64_to_cpu(kp1->rm_owner); 276cfed56aeSDarrick J. Wong y = be64_to_cpu(kp2->rm_owner); 277cfed56aeSDarrick J. Wong if (x > y) 278cfed56aeSDarrick J. Wong return 1; 279cfed56aeSDarrick J. Wong else if (y > x) 280cfed56aeSDarrick J. Wong return -1; 281cfed56aeSDarrick J. Wong 282cfed56aeSDarrick J. Wong x = XFS_RMAP_OFF(be64_to_cpu(kp1->rm_offset)); 283cfed56aeSDarrick J. Wong y = XFS_RMAP_OFF(be64_to_cpu(kp2->rm_offset)); 284cfed56aeSDarrick J. Wong if (x > y) 285cfed56aeSDarrick J. Wong return 1; 286cfed56aeSDarrick J. Wong else if (y > x) 287cfed56aeSDarrick J. Wong return -1; 288cfed56aeSDarrick J. Wong return 0; 289cfed56aeSDarrick J. Wong } 290cfed56aeSDarrick J. Wong 291a6a781a5SDarrick J. Wong static xfs_failaddr_t 292035e00acSDarrick J. Wong xfs_rmapbt_verify( 293035e00acSDarrick J. Wong struct xfs_buf *bp) 294035e00acSDarrick J. Wong { 295035e00acSDarrick J. Wong struct xfs_mount *mp = bp->b_target->bt_mount; 296035e00acSDarrick J. Wong struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); 297035e00acSDarrick J. Wong struct xfs_perag *pag = bp->b_pag; 298a6a781a5SDarrick J. Wong xfs_failaddr_t fa; 299035e00acSDarrick J. Wong unsigned int level; 300035e00acSDarrick J. Wong 301035e00acSDarrick J. Wong /* 302035e00acSDarrick J. Wong * magic number and level verification 303035e00acSDarrick J. Wong * 304035e00acSDarrick J. Wong * During growfs operations, we can't verify the exact level or owner as 305035e00acSDarrick J. Wong * the perag is not fully initialised and hence not attached to the 306035e00acSDarrick J. Wong * buffer. In this case, check against the maximum tree depth. 307035e00acSDarrick J. Wong * 308035e00acSDarrick J. Wong * Similarly, during log recovery we will have a perag structure 309035e00acSDarrick J. Wong * attached, but the agf information will not yet have been initialised 310035e00acSDarrick J. Wong * from the on disk AGF. Again, we can only check against maximum limits 311035e00acSDarrick J. Wong * in this case. 312035e00acSDarrick J. Wong */ 31339708c20SBrian Foster if (!xfs_verify_magic(bp, block->bb_magic)) 314a6a781a5SDarrick J. Wong return __this_address; 315035e00acSDarrick J. Wong 316035e00acSDarrick J. Wong if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) 317a6a781a5SDarrick J. Wong return __this_address; 318a6a781a5SDarrick J. Wong fa = xfs_btree_sblock_v5hdr_verify(bp); 319a6a781a5SDarrick J. Wong if (fa) 320a6a781a5SDarrick J. Wong return fa; 321035e00acSDarrick J. Wong 322035e00acSDarrick J. Wong level = be16_to_cpu(block->bb_level); 323035e00acSDarrick J. Wong if (pag && pag->pagf_init) { 324035e00acSDarrick J. Wong if (level >= pag->pagf_levels[XFS_BTNUM_RMAPi]) 325a6a781a5SDarrick J. Wong return __this_address; 326035e00acSDarrick J. Wong } else if (level >= mp->m_rmap_maxlevels) 327a6a781a5SDarrick J. Wong return __this_address; 328035e00acSDarrick J. Wong 329035e00acSDarrick J. Wong return xfs_btree_sblock_verify(bp, mp->m_rmap_mxr[level != 0]); 330035e00acSDarrick J. Wong } 331035e00acSDarrick J. Wong 332035e00acSDarrick J. Wong static void 333035e00acSDarrick J. Wong xfs_rmapbt_read_verify( 334035e00acSDarrick J. Wong struct xfs_buf *bp) 335035e00acSDarrick J. Wong { 336bc1a09b8SDarrick J. Wong xfs_failaddr_t fa; 337bc1a09b8SDarrick J. Wong 338035e00acSDarrick J. Wong if (!xfs_btree_sblock_verify_crc(bp)) 339bc1a09b8SDarrick J. Wong xfs_verifier_error(bp, -EFSBADCRC, __this_address); 340bc1a09b8SDarrick J. Wong else { 341bc1a09b8SDarrick J. Wong fa = xfs_rmapbt_verify(bp); 342bc1a09b8SDarrick J. Wong if (fa) 343bc1a09b8SDarrick J. Wong xfs_verifier_error(bp, -EFSCORRUPTED, fa); 344bc1a09b8SDarrick J. Wong } 345035e00acSDarrick J. Wong 34631ca03c9SDarrick J. Wong if (bp->b_error) 347035e00acSDarrick J. Wong trace_xfs_btree_corrupt(bp, _RET_IP_); 348035e00acSDarrick J. Wong } 349035e00acSDarrick J. Wong 350035e00acSDarrick J. Wong static void 351035e00acSDarrick J. Wong xfs_rmapbt_write_verify( 352035e00acSDarrick J. Wong struct xfs_buf *bp) 353035e00acSDarrick J. Wong { 354bc1a09b8SDarrick J. Wong xfs_failaddr_t fa; 355bc1a09b8SDarrick J. Wong 356bc1a09b8SDarrick J. Wong fa = xfs_rmapbt_verify(bp); 357bc1a09b8SDarrick J. Wong if (fa) { 358035e00acSDarrick J. Wong trace_xfs_btree_corrupt(bp, _RET_IP_); 359bc1a09b8SDarrick J. Wong xfs_verifier_error(bp, -EFSCORRUPTED, fa); 360035e00acSDarrick J. Wong return; 361035e00acSDarrick J. Wong } 362035e00acSDarrick J. Wong xfs_btree_sblock_calc_crc(bp); 363035e00acSDarrick J. Wong 364035e00acSDarrick J. Wong } 365035e00acSDarrick J. Wong 366035e00acSDarrick J. Wong const struct xfs_buf_ops xfs_rmapbt_buf_ops = { 367035e00acSDarrick J. Wong .name = "xfs_rmapbt", 36839708c20SBrian Foster .magic = { 0, cpu_to_be32(XFS_RMAP_CRC_MAGIC) }, 369035e00acSDarrick J. Wong .verify_read = xfs_rmapbt_read_verify, 370035e00acSDarrick J. Wong .verify_write = xfs_rmapbt_write_verify, 371b5572597SDarrick J. Wong .verify_struct = xfs_rmapbt_verify, 372035e00acSDarrick J. Wong }; 373035e00acSDarrick J. Wong 3744b8ed677SDarrick J. Wong STATIC int 3754b8ed677SDarrick J. Wong xfs_rmapbt_keys_inorder( 3764b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 3774b8ed677SDarrick J. Wong union xfs_btree_key *k1, 3784b8ed677SDarrick J. Wong union xfs_btree_key *k2) 3794b8ed677SDarrick J. Wong { 380c8ce540dSDarrick J. Wong uint32_t x; 381c8ce540dSDarrick J. Wong uint32_t y; 382c8ce540dSDarrick J. Wong uint64_t a; 383c8ce540dSDarrick J. Wong uint64_t b; 3844b8ed677SDarrick J. Wong 3854b8ed677SDarrick J. Wong x = be32_to_cpu(k1->rmap.rm_startblock); 3864b8ed677SDarrick J. Wong y = be32_to_cpu(k2->rmap.rm_startblock); 3874b8ed677SDarrick J. Wong if (x < y) 3884b8ed677SDarrick J. Wong return 1; 3894b8ed677SDarrick J. Wong else if (x > y) 3904b8ed677SDarrick J. Wong return 0; 3914b8ed677SDarrick J. Wong a = be64_to_cpu(k1->rmap.rm_owner); 3924b8ed677SDarrick J. Wong b = be64_to_cpu(k2->rmap.rm_owner); 3934b8ed677SDarrick J. Wong if (a < b) 3944b8ed677SDarrick J. Wong return 1; 3954b8ed677SDarrick J. Wong else if (a > b) 3964b8ed677SDarrick J. Wong return 0; 3974b8ed677SDarrick J. Wong a = XFS_RMAP_OFF(be64_to_cpu(k1->rmap.rm_offset)); 3984b8ed677SDarrick J. Wong b = XFS_RMAP_OFF(be64_to_cpu(k2->rmap.rm_offset)); 3994b8ed677SDarrick J. Wong if (a <= b) 4004b8ed677SDarrick J. Wong return 1; 4014b8ed677SDarrick J. Wong return 0; 4024b8ed677SDarrick J. Wong } 4034b8ed677SDarrick J. Wong 4044b8ed677SDarrick J. Wong STATIC int 4054b8ed677SDarrick J. Wong xfs_rmapbt_recs_inorder( 4064b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 4074b8ed677SDarrick J. Wong union xfs_btree_rec *r1, 4084b8ed677SDarrick J. Wong union xfs_btree_rec *r2) 4094b8ed677SDarrick J. Wong { 410c8ce540dSDarrick J. Wong uint32_t x; 411c8ce540dSDarrick J. Wong uint32_t y; 412c8ce540dSDarrick J. Wong uint64_t a; 413c8ce540dSDarrick J. Wong uint64_t b; 4144b8ed677SDarrick J. Wong 4154b8ed677SDarrick J. Wong x = be32_to_cpu(r1->rmap.rm_startblock); 4164b8ed677SDarrick J. Wong y = be32_to_cpu(r2->rmap.rm_startblock); 4174b8ed677SDarrick J. Wong if (x < y) 4184b8ed677SDarrick J. Wong return 1; 4194b8ed677SDarrick J. Wong else if (x > y) 4204b8ed677SDarrick J. Wong return 0; 4214b8ed677SDarrick J. Wong a = be64_to_cpu(r1->rmap.rm_owner); 4224b8ed677SDarrick J. Wong b = be64_to_cpu(r2->rmap.rm_owner); 4234b8ed677SDarrick J. Wong if (a < b) 4244b8ed677SDarrick J. Wong return 1; 4254b8ed677SDarrick J. Wong else if (a > b) 4264b8ed677SDarrick J. Wong return 0; 4274b8ed677SDarrick J. Wong a = XFS_RMAP_OFF(be64_to_cpu(r1->rmap.rm_offset)); 4284b8ed677SDarrick J. Wong b = XFS_RMAP_OFF(be64_to_cpu(r2->rmap.rm_offset)); 4294b8ed677SDarrick J. Wong if (a <= b) 4304b8ed677SDarrick J. Wong return 1; 4314b8ed677SDarrick J. Wong return 0; 4324b8ed677SDarrick J. Wong } 4334b8ed677SDarrick J. Wong 434035e00acSDarrick J. Wong static const struct xfs_btree_ops xfs_rmapbt_ops = { 435035e00acSDarrick J. Wong .rec_len = sizeof(struct xfs_rmap_rec), 436035e00acSDarrick J. Wong .key_len = 2 * sizeof(struct xfs_rmap_key), 437035e00acSDarrick J. Wong 438035e00acSDarrick J. Wong .dup_cursor = xfs_rmapbt_dup_cursor, 4394b8ed677SDarrick J. Wong .set_root = xfs_rmapbt_set_root, 4404b8ed677SDarrick J. Wong .alloc_block = xfs_rmapbt_alloc_block, 4414b8ed677SDarrick J. Wong .free_block = xfs_rmapbt_free_block, 4424b8ed677SDarrick J. Wong .get_minrecs = xfs_rmapbt_get_minrecs, 4434b8ed677SDarrick J. Wong .get_maxrecs = xfs_rmapbt_get_maxrecs, 4444b8ed677SDarrick J. Wong .init_key_from_rec = xfs_rmapbt_init_key_from_rec, 445cfed56aeSDarrick J. Wong .init_high_key_from_rec = xfs_rmapbt_init_high_key_from_rec, 4464b8ed677SDarrick J. Wong .init_rec_from_cur = xfs_rmapbt_init_rec_from_cur, 4474b8ed677SDarrick J. Wong .init_ptr_from_cur = xfs_rmapbt_init_ptr_from_cur, 4484b8ed677SDarrick J. Wong .key_diff = xfs_rmapbt_key_diff, 449035e00acSDarrick J. Wong .buf_ops = &xfs_rmapbt_buf_ops, 450cfed56aeSDarrick J. Wong .diff_two_keys = xfs_rmapbt_diff_two_keys, 4514b8ed677SDarrick J. Wong .keys_inorder = xfs_rmapbt_keys_inorder, 4524b8ed677SDarrick J. Wong .recs_inorder = xfs_rmapbt_recs_inorder, 453035e00acSDarrick J. Wong }; 454035e00acSDarrick J. Wong 455035e00acSDarrick J. Wong /* 456035e00acSDarrick J. Wong * Allocate a new allocation btree cursor. 457035e00acSDarrick J. Wong */ 458035e00acSDarrick J. Wong struct xfs_btree_cur * 459035e00acSDarrick J. Wong xfs_rmapbt_init_cursor( 460035e00acSDarrick J. Wong struct xfs_mount *mp, 461035e00acSDarrick J. Wong struct xfs_trans *tp, 462035e00acSDarrick J. Wong struct xfs_buf *agbp, 463035e00acSDarrick J. Wong xfs_agnumber_t agno) 464035e00acSDarrick J. Wong { 465035e00acSDarrick J. Wong struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp); 466035e00acSDarrick J. Wong struct xfs_btree_cur *cur; 467035e00acSDarrick J. Wong 468035e00acSDarrick J. Wong cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS); 469035e00acSDarrick J. Wong cur->bc_tp = tp; 470035e00acSDarrick J. Wong cur->bc_mp = mp; 471cfed56aeSDarrick J. Wong /* Overlapping btree; 2 keys per pointer. */ 472035e00acSDarrick J. Wong cur->bc_btnum = XFS_BTNUM_RMAP; 473cfed56aeSDarrick J. Wong cur->bc_flags = XFS_BTREE_CRC_BLOCKS | XFS_BTREE_OVERLAPPING; 474035e00acSDarrick J. Wong cur->bc_blocklog = mp->m_sb.sb_blocklog; 475035e00acSDarrick J. Wong cur->bc_ops = &xfs_rmapbt_ops; 476035e00acSDarrick J. Wong cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]); 47711ef38afSDave Chinner cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_rmap_2); 478035e00acSDarrick J. Wong 479035e00acSDarrick J. Wong cur->bc_private.a.agbp = agbp; 480035e00acSDarrick J. Wong cur->bc_private.a.agno = agno; 481035e00acSDarrick J. Wong 482035e00acSDarrick J. Wong return cur; 483035e00acSDarrick J. Wong } 484035e00acSDarrick J. Wong 485035e00acSDarrick J. Wong /* 486035e00acSDarrick J. Wong * Calculate number of records in an rmap btree block. 487035e00acSDarrick J. Wong */ 488035e00acSDarrick J. Wong int 489035e00acSDarrick J. Wong xfs_rmapbt_maxrecs( 490035e00acSDarrick J. Wong int blocklen, 491035e00acSDarrick J. Wong int leaf) 492035e00acSDarrick J. Wong { 493035e00acSDarrick J. Wong blocklen -= XFS_RMAP_BLOCK_LEN; 494035e00acSDarrick J. Wong 495035e00acSDarrick J. Wong if (leaf) 496035e00acSDarrick J. Wong return blocklen / sizeof(struct xfs_rmap_rec); 497035e00acSDarrick J. Wong return blocklen / 498cfed56aeSDarrick J. Wong (2 * sizeof(struct xfs_rmap_key) + sizeof(xfs_rmap_ptr_t)); 499035e00acSDarrick J. Wong } 500035e00acSDarrick J. Wong 501035e00acSDarrick J. Wong /* Compute the maximum height of an rmap btree. */ 502035e00acSDarrick J. Wong void 503035e00acSDarrick J. Wong xfs_rmapbt_compute_maxlevels( 504035e00acSDarrick J. Wong struct xfs_mount *mp) 505035e00acSDarrick J. Wong { 50646eeb521SDarrick J. Wong /* 50746eeb521SDarrick J. Wong * On a non-reflink filesystem, the maximum number of rmap 50846eeb521SDarrick J. Wong * records is the number of blocks in the AG, hence the max 50946eeb521SDarrick J. Wong * rmapbt height is log_$maxrecs($agblocks). However, with 51046eeb521SDarrick J. Wong * reflink each AG block can have up to 2^32 (per the refcount 51146eeb521SDarrick J. Wong * record format) owners, which means that theoretically we 51246eeb521SDarrick J. Wong * could face up to 2^64 rmap records. 51346eeb521SDarrick J. Wong * 51446eeb521SDarrick J. Wong * That effectively means that the max rmapbt height must be 51546eeb521SDarrick J. Wong * XFS_BTREE_MAXLEVELS. "Fortunately" we'll run out of AG 51646eeb521SDarrick J. Wong * blocks to feed the rmapbt long before the rmapbt reaches 51746eeb521SDarrick J. Wong * maximum height. The reflink code uses ag_resv_critical to 51846eeb521SDarrick J. Wong * disallow reflinking when less than 10% of the per-AG metadata 51946eeb521SDarrick J. Wong * block reservation since the fallback is a regular file copy. 52046eeb521SDarrick J. Wong */ 52146eeb521SDarrick J. Wong if (xfs_sb_version_hasreflink(&mp->m_sb)) 52246eeb521SDarrick J. Wong mp->m_rmap_maxlevels = XFS_BTREE_MAXLEVELS; 52346eeb521SDarrick J. Wong else 524a1f69417SEric Sandeen mp->m_rmap_maxlevels = xfs_btree_compute_maxlevels( 525035e00acSDarrick J. Wong mp->m_rmap_mnr, mp->m_sb.sb_agblocks); 526035e00acSDarrick J. Wong } 52784d69619SDarrick J. Wong 52884d69619SDarrick J. Wong /* Calculate the refcount btree size for some records. */ 52984d69619SDarrick J. Wong xfs_extlen_t 53084d69619SDarrick J. Wong xfs_rmapbt_calc_size( 53184d69619SDarrick J. Wong struct xfs_mount *mp, 53284d69619SDarrick J. Wong unsigned long long len) 53384d69619SDarrick J. Wong { 534a1f69417SEric Sandeen return xfs_btree_calc_size(mp->m_rmap_mnr, len); 53584d69619SDarrick J. Wong } 53684d69619SDarrick J. Wong 53784d69619SDarrick J. Wong /* 53884d69619SDarrick J. Wong * Calculate the maximum refcount btree size. 53984d69619SDarrick J. Wong */ 54084d69619SDarrick J. Wong xfs_extlen_t 54184d69619SDarrick J. Wong xfs_rmapbt_max_size( 54220e73b00SDarrick J. Wong struct xfs_mount *mp, 54320e73b00SDarrick J. Wong xfs_agblock_t agblocks) 54484d69619SDarrick J. Wong { 54584d69619SDarrick J. Wong /* Bail out if we're uninitialized, which can happen in mkfs. */ 54684d69619SDarrick J. Wong if (mp->m_rmap_mxr[0] == 0) 54784d69619SDarrick J. Wong return 0; 54884d69619SDarrick J. Wong 54920e73b00SDarrick J. Wong return xfs_rmapbt_calc_size(mp, agblocks); 55084d69619SDarrick J. Wong } 55184d69619SDarrick J. Wong 55284d69619SDarrick J. Wong /* 55384d69619SDarrick J. Wong * Figure out how many blocks to reserve and how many are used by this btree. 55484d69619SDarrick J. Wong */ 55584d69619SDarrick J. Wong int 55684d69619SDarrick J. Wong xfs_rmapbt_calc_reserves( 55784d69619SDarrick J. Wong struct xfs_mount *mp, 558ebcbef3aSDarrick J. Wong struct xfs_trans *tp, 55984d69619SDarrick J. Wong xfs_agnumber_t agno, 56084d69619SDarrick J. Wong xfs_extlen_t *ask, 56184d69619SDarrick J. Wong xfs_extlen_t *used) 56284d69619SDarrick J. Wong { 56384d69619SDarrick J. Wong struct xfs_buf *agbp; 56484d69619SDarrick J. Wong struct xfs_agf *agf; 56520e73b00SDarrick J. Wong xfs_agblock_t agblocks; 56684d69619SDarrick J. Wong xfs_extlen_t tree_len; 56784d69619SDarrick J. Wong int error; 56884d69619SDarrick J. Wong 56984d69619SDarrick J. Wong if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) 57084d69619SDarrick J. Wong return 0; 57184d69619SDarrick J. Wong 572ebcbef3aSDarrick J. Wong error = xfs_alloc_read_agf(mp, tp, agno, 0, &agbp); 57384d69619SDarrick J. Wong if (error) 57484d69619SDarrick J. Wong return error; 57584d69619SDarrick J. Wong 57684d69619SDarrick J. Wong agf = XFS_BUF_TO_AGF(agbp); 57720e73b00SDarrick J. Wong agblocks = be32_to_cpu(agf->agf_length); 57884d69619SDarrick J. Wong tree_len = be32_to_cpu(agf->agf_rmap_blocks); 579ebcbef3aSDarrick J. Wong xfs_trans_brelse(tp, agbp); 58084d69619SDarrick J. Wong 58120e73b00SDarrick J. Wong /* Reserve 1% of the AG or enough for 1 block per record. */ 58220e73b00SDarrick J. Wong *ask += max(agblocks / 100, xfs_rmapbt_max_size(mp, agblocks)); 58384d69619SDarrick J. Wong *used += tree_len; 58484d69619SDarrick J. Wong 58584d69619SDarrick J. Wong return error; 58684d69619SDarrick J. Wong } 587