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_sb.h" 13035e00acSDarrick J. Wong #include "xfs_mount.h" 14035e00acSDarrick J. Wong #include "xfs_trans.h" 15035e00acSDarrick J. Wong #include "xfs_alloc.h" 16035e00acSDarrick J. Wong #include "xfs_btree.h" 1759d67712SDarrick J. Wong #include "xfs_btree_staging.h" 184b8ed677SDarrick J. Wong #include "xfs_rmap.h" 19035e00acSDarrick J. Wong #include "xfs_rmap_btree.h" 20035e00acSDarrick J. Wong #include "xfs_trace.h" 21035e00acSDarrick J. Wong #include "xfs_error.h" 22035e00acSDarrick J. Wong #include "xfs_extent_busy.h" 2384d69619SDarrick J. Wong #include "xfs_ag_resv.h" 24035e00acSDarrick J. Wong 254b8ed677SDarrick J. Wong /* 264b8ed677SDarrick J. Wong * Reverse map btree. 274b8ed677SDarrick J. Wong * 284b8ed677SDarrick J. Wong * This is a per-ag tree used to track the owner(s) of a given extent. With 294b8ed677SDarrick J. Wong * reflink it is possible for there to be multiple owners, which is a departure 304b8ed677SDarrick J. Wong * from classic XFS. Owner records for data extents are inserted when the 314b8ed677SDarrick J. Wong * extent is mapped and removed when an extent is unmapped. Owner records for 324b8ed677SDarrick J. Wong * all other block types (i.e. metadata) are inserted when an extent is 334b8ed677SDarrick J. Wong * allocated and removed when an extent is freed. There can only be one owner 344b8ed677SDarrick J. Wong * of a metadata extent, usually an inode or some other metadata structure like 354b8ed677SDarrick J. Wong * an AG btree. 364b8ed677SDarrick J. Wong * 374b8ed677SDarrick J. Wong * The rmap btree is part of the free space management, so blocks for the tree 384b8ed677SDarrick J. Wong * are sourced from the agfl. Hence we need transaction reservation support for 394b8ed677SDarrick J. Wong * this tree so that the freelist is always large enough. This also impacts on 404b8ed677SDarrick J. Wong * the minimum space we need to leave free in the AG. 414b8ed677SDarrick J. Wong * 424b8ed677SDarrick J. Wong * The tree is ordered by [ag block, owner, offset]. This is a large key size, 434b8ed677SDarrick J. Wong * but it is the only way to enforce unique keys when a block can be owned by 444b8ed677SDarrick J. Wong * multiple files at any offset. There's no need to order/search by extent 454b8ed677SDarrick J. Wong * size for online updating/management of the tree. It is intended that most 464b8ed677SDarrick J. Wong * reverse lookups will be to find the owner(s) of a particular block, or to 474b8ed677SDarrick J. Wong * try to recover tree and file data from corrupt primary metadata. 484b8ed677SDarrick J. Wong */ 494b8ed677SDarrick J. Wong 50035e00acSDarrick J. Wong static struct xfs_btree_cur * 51035e00acSDarrick J. Wong xfs_rmapbt_dup_cursor( 52035e00acSDarrick J. Wong struct xfs_btree_cur *cur) 53035e00acSDarrick J. Wong { 54035e00acSDarrick J. Wong return xfs_rmapbt_init_cursor(cur->bc_mp, cur->bc_tp, 55576af732SDave Chinner cur->bc_ag.agbp, cur->bc_ag.agno); 56035e00acSDarrick J. Wong } 57035e00acSDarrick J. Wong 584b8ed677SDarrick J. Wong STATIC void 594b8ed677SDarrick J. Wong xfs_rmapbt_set_root( 604b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 614b8ed677SDarrick J. Wong union xfs_btree_ptr *ptr, 624b8ed677SDarrick J. Wong int inc) 634b8ed677SDarrick J. Wong { 64576af732SDave Chinner struct xfs_buf *agbp = cur->bc_ag.agbp; 659798f615SChristoph Hellwig struct xfs_agf *agf = agbp->b_addr; 664b8ed677SDarrick J. Wong xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno); 674b8ed677SDarrick J. Wong int btnum = cur->bc_btnum; 684b8ed677SDarrick J. Wong struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno); 694b8ed677SDarrick J. Wong 704b8ed677SDarrick J. Wong ASSERT(ptr->s != 0); 714b8ed677SDarrick J. Wong 724b8ed677SDarrick J. Wong agf->agf_roots[btnum] = ptr->s; 734b8ed677SDarrick J. Wong be32_add_cpu(&agf->agf_levels[btnum], inc); 744b8ed677SDarrick J. Wong pag->pagf_levels[btnum] += inc; 754b8ed677SDarrick J. Wong xfs_perag_put(pag); 764b8ed677SDarrick J. Wong 774b8ed677SDarrick J. Wong xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS); 784b8ed677SDarrick J. Wong } 794b8ed677SDarrick J. Wong 804b8ed677SDarrick J. Wong STATIC int 814b8ed677SDarrick J. Wong xfs_rmapbt_alloc_block( 824b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 834b8ed677SDarrick J. Wong union xfs_btree_ptr *start, 844b8ed677SDarrick J. Wong union xfs_btree_ptr *new, 854b8ed677SDarrick J. Wong int *stat) 864b8ed677SDarrick J. Wong { 87576af732SDave Chinner struct xfs_buf *agbp = cur->bc_ag.agbp; 889798f615SChristoph Hellwig struct xfs_agf *agf = agbp->b_addr; 894b8ed677SDarrick J. Wong int error; 904b8ed677SDarrick J. Wong xfs_agblock_t bno; 914b8ed677SDarrick J. Wong 924b8ed677SDarrick J. Wong /* Allocate the new block from the freelist. If we can't, give up. */ 93576af732SDave Chinner error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_ag.agbp, 944b8ed677SDarrick J. Wong &bno, 1); 95e157ebdcSCarlos Maiolino if (error) 964b8ed677SDarrick J. Wong return error; 974b8ed677SDarrick J. Wong 98576af732SDave Chinner trace_xfs_rmapbt_alloc_block(cur->bc_mp, cur->bc_ag.agno, 994b8ed677SDarrick J. Wong bno, 1); 1004b8ed677SDarrick J. Wong if (bno == NULLAGBLOCK) { 1014b8ed677SDarrick J. Wong *stat = 0; 1024b8ed677SDarrick J. Wong return 0; 1034b8ed677SDarrick J. Wong } 1044b8ed677SDarrick J. Wong 105576af732SDave Chinner xfs_extent_busy_reuse(cur->bc_mp, cur->bc_ag.agno, bno, 1, 1064b8ed677SDarrick J. Wong false); 1074b8ed677SDarrick J. Wong 1084b8ed677SDarrick J. Wong xfs_trans_agbtree_delta(cur->bc_tp, 1); 1094b8ed677SDarrick J. Wong new->s = cpu_to_be32(bno); 110f32866fdSDarrick J. Wong be32_add_cpu(&agf->agf_rmap_blocks, 1); 111f32866fdSDarrick J. Wong xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS); 1124b8ed677SDarrick J. Wong 113576af732SDave Chinner xfs_ag_resv_rmapbt_alloc(cur->bc_mp, cur->bc_ag.agno); 1140ab32086SBrian Foster 1154b8ed677SDarrick J. Wong *stat = 1; 1164b8ed677SDarrick J. Wong return 0; 1174b8ed677SDarrick J. Wong } 1184b8ed677SDarrick J. Wong 1194b8ed677SDarrick J. Wong STATIC int 1204b8ed677SDarrick J. Wong xfs_rmapbt_free_block( 1214b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 1224b8ed677SDarrick J. Wong struct xfs_buf *bp) 1234b8ed677SDarrick J. Wong { 124576af732SDave Chinner struct xfs_buf *agbp = cur->bc_ag.agbp; 1259798f615SChristoph Hellwig struct xfs_agf *agf = agbp->b_addr; 1264b8ed677SDarrick J. Wong xfs_agblock_t bno; 1274b8ed677SDarrick J. Wong int error; 1284b8ed677SDarrick J. Wong 1294b8ed677SDarrick J. Wong bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp)); 130576af732SDave Chinner trace_xfs_rmapbt_free_block(cur->bc_mp, cur->bc_ag.agno, 1314b8ed677SDarrick J. Wong bno, 1); 132f32866fdSDarrick J. Wong be32_add_cpu(&agf->agf_rmap_blocks, -1); 133f32866fdSDarrick J. Wong xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS); 1344b8ed677SDarrick J. Wong error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1); 1354b8ed677SDarrick J. Wong if (error) 1364b8ed677SDarrick J. Wong return error; 1374b8ed677SDarrick J. Wong 1384b8ed677SDarrick J. Wong xfs_extent_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1, 1394b8ed677SDarrick J. Wong XFS_EXTENT_BUSY_SKIP_DISCARD); 1404b8ed677SDarrick J. Wong xfs_trans_agbtree_delta(cur->bc_tp, -1); 1414b8ed677SDarrick J. Wong 142576af732SDave Chinner xfs_ag_resv_rmapbt_free(cur->bc_mp, cur->bc_ag.agno); 1430ab32086SBrian Foster 1444b8ed677SDarrick J. Wong return 0; 1454b8ed677SDarrick J. Wong } 1464b8ed677SDarrick J. Wong 1474b8ed677SDarrick J. Wong STATIC int 1484b8ed677SDarrick J. Wong xfs_rmapbt_get_minrecs( 1494b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 1504b8ed677SDarrick J. Wong int level) 1514b8ed677SDarrick J. Wong { 1524b8ed677SDarrick J. Wong return cur->bc_mp->m_rmap_mnr[level != 0]; 1534b8ed677SDarrick J. Wong } 1544b8ed677SDarrick J. Wong 1554b8ed677SDarrick J. Wong STATIC int 1564b8ed677SDarrick J. Wong xfs_rmapbt_get_maxrecs( 1574b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 1584b8ed677SDarrick J. Wong int level) 1594b8ed677SDarrick J. Wong { 1604b8ed677SDarrick J. Wong return cur->bc_mp->m_rmap_mxr[level != 0]; 1614b8ed677SDarrick J. Wong } 1624b8ed677SDarrick J. Wong 1634b8ed677SDarrick J. Wong STATIC void 1644b8ed677SDarrick J. Wong xfs_rmapbt_init_key_from_rec( 1654b8ed677SDarrick J. Wong union xfs_btree_key *key, 1664b8ed677SDarrick J. Wong union xfs_btree_rec *rec) 1674b8ed677SDarrick J. Wong { 1684b8ed677SDarrick J. Wong key->rmap.rm_startblock = rec->rmap.rm_startblock; 1694b8ed677SDarrick J. Wong key->rmap.rm_owner = rec->rmap.rm_owner; 1704b8ed677SDarrick J. Wong key->rmap.rm_offset = rec->rmap.rm_offset; 1714b8ed677SDarrick J. Wong } 1724b8ed677SDarrick J. Wong 173cfed56aeSDarrick J. Wong /* 174cfed56aeSDarrick J. Wong * The high key for a reverse mapping record can be computed by shifting 175cfed56aeSDarrick J. Wong * the startblock and offset to the highest value that would still map 176cfed56aeSDarrick J. Wong * to that record. In practice this means that we add blockcount-1 to 177cfed56aeSDarrick J. Wong * the startblock for all records, and if the record is for a data/attr 178cfed56aeSDarrick J. Wong * fork mapping, we add blockcount-1 to the offset too. 179cfed56aeSDarrick J. Wong */ 180cfed56aeSDarrick J. Wong STATIC void 181cfed56aeSDarrick J. Wong xfs_rmapbt_init_high_key_from_rec( 182cfed56aeSDarrick J. Wong union xfs_btree_key *key, 183cfed56aeSDarrick J. Wong union xfs_btree_rec *rec) 184cfed56aeSDarrick J. Wong { 185c8ce540dSDarrick J. Wong uint64_t off; 186cfed56aeSDarrick J. Wong int adj; 187cfed56aeSDarrick J. Wong 188cfed56aeSDarrick J. Wong adj = be32_to_cpu(rec->rmap.rm_blockcount) - 1; 189cfed56aeSDarrick J. Wong 190cfed56aeSDarrick J. Wong key->rmap.rm_startblock = rec->rmap.rm_startblock; 191cfed56aeSDarrick J. Wong be32_add_cpu(&key->rmap.rm_startblock, adj); 192cfed56aeSDarrick J. Wong key->rmap.rm_owner = rec->rmap.rm_owner; 193cfed56aeSDarrick J. Wong key->rmap.rm_offset = rec->rmap.rm_offset; 194cfed56aeSDarrick J. Wong if (XFS_RMAP_NON_INODE_OWNER(be64_to_cpu(rec->rmap.rm_owner)) || 195cfed56aeSDarrick J. Wong XFS_RMAP_IS_BMBT_BLOCK(be64_to_cpu(rec->rmap.rm_offset))) 196cfed56aeSDarrick J. Wong return; 197cfed56aeSDarrick J. Wong off = be64_to_cpu(key->rmap.rm_offset); 198cfed56aeSDarrick J. Wong off = (XFS_RMAP_OFF(off) + adj) | (off & ~XFS_RMAP_OFF_MASK); 199cfed56aeSDarrick J. Wong key->rmap.rm_offset = cpu_to_be64(off); 200cfed56aeSDarrick J. Wong } 201cfed56aeSDarrick J. Wong 2024b8ed677SDarrick J. Wong STATIC void 2034b8ed677SDarrick J. Wong xfs_rmapbt_init_rec_from_cur( 2044b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 2054b8ed677SDarrick J. Wong union xfs_btree_rec *rec) 2064b8ed677SDarrick J. Wong { 2074b8ed677SDarrick J. Wong rec->rmap.rm_startblock = cpu_to_be32(cur->bc_rec.r.rm_startblock); 2084b8ed677SDarrick J. Wong rec->rmap.rm_blockcount = cpu_to_be32(cur->bc_rec.r.rm_blockcount); 2094b8ed677SDarrick J. Wong rec->rmap.rm_owner = cpu_to_be64(cur->bc_rec.r.rm_owner); 2104b8ed677SDarrick J. Wong rec->rmap.rm_offset = cpu_to_be64( 2114b8ed677SDarrick J. Wong xfs_rmap_irec_offset_pack(&cur->bc_rec.r)); 2124b8ed677SDarrick J. Wong } 2134b8ed677SDarrick J. Wong 2144b8ed677SDarrick J. Wong STATIC void 2154b8ed677SDarrick J. Wong xfs_rmapbt_init_ptr_from_cur( 2164b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 2174b8ed677SDarrick J. Wong union xfs_btree_ptr *ptr) 2184b8ed677SDarrick J. Wong { 219576af732SDave Chinner struct xfs_agf *agf = cur->bc_ag.agbp->b_addr; 2204b8ed677SDarrick J. Wong 221576af732SDave Chinner ASSERT(cur->bc_ag.agno == be32_to_cpu(agf->agf_seqno)); 2224b8ed677SDarrick J. Wong 2234b8ed677SDarrick J. Wong ptr->s = agf->agf_roots[cur->bc_btnum]; 2244b8ed677SDarrick J. Wong } 2254b8ed677SDarrick J. Wong 226c8ce540dSDarrick J. Wong STATIC int64_t 2274b8ed677SDarrick J. Wong xfs_rmapbt_key_diff( 2284b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 2294b8ed677SDarrick J. Wong union xfs_btree_key *key) 2304b8ed677SDarrick J. Wong { 2314b8ed677SDarrick J. Wong struct xfs_rmap_irec *rec = &cur->bc_rec.r; 2324b8ed677SDarrick J. Wong struct xfs_rmap_key *kp = &key->rmap; 2334b8ed677SDarrick J. Wong __u64 x, y; 234c8ce540dSDarrick J. Wong int64_t d; 2354b8ed677SDarrick J. Wong 236c8ce540dSDarrick J. Wong d = (int64_t)be32_to_cpu(kp->rm_startblock) - rec->rm_startblock; 2374b8ed677SDarrick J. Wong if (d) 2384b8ed677SDarrick J. Wong return d; 2394b8ed677SDarrick J. Wong 2404b8ed677SDarrick J. Wong x = be64_to_cpu(kp->rm_owner); 2414b8ed677SDarrick J. Wong y = rec->rm_owner; 2424b8ed677SDarrick J. Wong if (x > y) 2434b8ed677SDarrick J. Wong return 1; 2444b8ed677SDarrick J. Wong else if (y > x) 2454b8ed677SDarrick J. Wong return -1; 2464b8ed677SDarrick J. Wong 2474b8ed677SDarrick J. Wong x = XFS_RMAP_OFF(be64_to_cpu(kp->rm_offset)); 2484b8ed677SDarrick J. Wong y = rec->rm_offset; 2494b8ed677SDarrick J. Wong if (x > y) 2504b8ed677SDarrick J. Wong return 1; 2514b8ed677SDarrick J. Wong else if (y > x) 2524b8ed677SDarrick J. Wong return -1; 2534b8ed677SDarrick J. Wong return 0; 2544b8ed677SDarrick J. Wong } 2554b8ed677SDarrick J. Wong 256c8ce540dSDarrick J. Wong STATIC int64_t 257cfed56aeSDarrick J. Wong xfs_rmapbt_diff_two_keys( 258cfed56aeSDarrick J. Wong struct xfs_btree_cur *cur, 259cfed56aeSDarrick J. Wong union xfs_btree_key *k1, 260cfed56aeSDarrick J. Wong union xfs_btree_key *k2) 261cfed56aeSDarrick J. Wong { 262cfed56aeSDarrick J. Wong struct xfs_rmap_key *kp1 = &k1->rmap; 263cfed56aeSDarrick J. Wong struct xfs_rmap_key *kp2 = &k2->rmap; 264c8ce540dSDarrick J. Wong int64_t d; 265cfed56aeSDarrick J. Wong __u64 x, y; 266cfed56aeSDarrick J. Wong 267c8ce540dSDarrick J. Wong d = (int64_t)be32_to_cpu(kp1->rm_startblock) - 268cfed56aeSDarrick J. Wong be32_to_cpu(kp2->rm_startblock); 269cfed56aeSDarrick J. Wong if (d) 270cfed56aeSDarrick J. Wong return d; 271cfed56aeSDarrick J. Wong 272cfed56aeSDarrick J. Wong x = be64_to_cpu(kp1->rm_owner); 273cfed56aeSDarrick J. Wong y = be64_to_cpu(kp2->rm_owner); 274cfed56aeSDarrick J. Wong if (x > y) 275cfed56aeSDarrick J. Wong return 1; 276cfed56aeSDarrick J. Wong else if (y > x) 277cfed56aeSDarrick J. Wong return -1; 278cfed56aeSDarrick J. Wong 279cfed56aeSDarrick J. Wong x = XFS_RMAP_OFF(be64_to_cpu(kp1->rm_offset)); 280cfed56aeSDarrick J. Wong y = XFS_RMAP_OFF(be64_to_cpu(kp2->rm_offset)); 281cfed56aeSDarrick J. Wong if (x > y) 282cfed56aeSDarrick J. Wong return 1; 283cfed56aeSDarrick J. Wong else if (y > x) 284cfed56aeSDarrick J. Wong return -1; 285cfed56aeSDarrick J. Wong return 0; 286cfed56aeSDarrick J. Wong } 287cfed56aeSDarrick J. Wong 288a6a781a5SDarrick J. Wong static xfs_failaddr_t 289035e00acSDarrick J. Wong xfs_rmapbt_verify( 290035e00acSDarrick J. Wong struct xfs_buf *bp) 291035e00acSDarrick J. Wong { 292dbd329f1SChristoph Hellwig struct xfs_mount *mp = bp->b_mount; 293035e00acSDarrick J. Wong struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); 294035e00acSDarrick J. Wong struct xfs_perag *pag = bp->b_pag; 295a6a781a5SDarrick J. Wong xfs_failaddr_t fa; 296035e00acSDarrick J. Wong unsigned int level; 297035e00acSDarrick J. Wong 298035e00acSDarrick J. Wong /* 299035e00acSDarrick J. Wong * magic number and level verification 300035e00acSDarrick J. Wong * 301035e00acSDarrick J. Wong * During growfs operations, we can't verify the exact level or owner as 302035e00acSDarrick J. Wong * the perag is not fully initialised and hence not attached to the 303035e00acSDarrick J. Wong * buffer. In this case, check against the maximum tree depth. 304035e00acSDarrick J. Wong * 305035e00acSDarrick J. Wong * Similarly, during log recovery we will have a perag structure 306035e00acSDarrick J. Wong * attached, but the agf information will not yet have been initialised 307035e00acSDarrick J. Wong * from the on disk AGF. Again, we can only check against maximum limits 308035e00acSDarrick J. Wong * in this case. 309035e00acSDarrick J. Wong */ 31039708c20SBrian Foster if (!xfs_verify_magic(bp, block->bb_magic)) 311a6a781a5SDarrick J. Wong return __this_address; 312035e00acSDarrick J. Wong 313035e00acSDarrick J. Wong if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) 314a6a781a5SDarrick J. Wong return __this_address; 315a6a781a5SDarrick J. Wong fa = xfs_btree_sblock_v5hdr_verify(bp); 316a6a781a5SDarrick J. Wong if (fa) 317a6a781a5SDarrick J. Wong return fa; 318035e00acSDarrick J. Wong 319035e00acSDarrick J. Wong level = be16_to_cpu(block->bb_level); 320035e00acSDarrick J. Wong if (pag && pag->pagf_init) { 321035e00acSDarrick J. Wong if (level >= pag->pagf_levels[XFS_BTNUM_RMAPi]) 322a6a781a5SDarrick J. Wong return __this_address; 323035e00acSDarrick J. Wong } else if (level >= mp->m_rmap_maxlevels) 324a6a781a5SDarrick J. Wong return __this_address; 325035e00acSDarrick J. Wong 326035e00acSDarrick J. Wong return xfs_btree_sblock_verify(bp, mp->m_rmap_mxr[level != 0]); 327035e00acSDarrick J. Wong } 328035e00acSDarrick J. Wong 329035e00acSDarrick J. Wong static void 330035e00acSDarrick J. Wong xfs_rmapbt_read_verify( 331035e00acSDarrick J. Wong struct xfs_buf *bp) 332035e00acSDarrick J. Wong { 333bc1a09b8SDarrick J. Wong xfs_failaddr_t fa; 334bc1a09b8SDarrick J. Wong 335035e00acSDarrick J. Wong if (!xfs_btree_sblock_verify_crc(bp)) 336bc1a09b8SDarrick J. Wong xfs_verifier_error(bp, -EFSBADCRC, __this_address); 337bc1a09b8SDarrick J. Wong else { 338bc1a09b8SDarrick J. Wong fa = xfs_rmapbt_verify(bp); 339bc1a09b8SDarrick J. Wong if (fa) 340bc1a09b8SDarrick J. Wong xfs_verifier_error(bp, -EFSCORRUPTED, fa); 341bc1a09b8SDarrick J. Wong } 342035e00acSDarrick J. Wong 34331ca03c9SDarrick J. Wong if (bp->b_error) 344035e00acSDarrick J. Wong trace_xfs_btree_corrupt(bp, _RET_IP_); 345035e00acSDarrick J. Wong } 346035e00acSDarrick J. Wong 347035e00acSDarrick J. Wong static void 348035e00acSDarrick J. Wong xfs_rmapbt_write_verify( 349035e00acSDarrick J. Wong struct xfs_buf *bp) 350035e00acSDarrick J. Wong { 351bc1a09b8SDarrick J. Wong xfs_failaddr_t fa; 352bc1a09b8SDarrick J. Wong 353bc1a09b8SDarrick J. Wong fa = xfs_rmapbt_verify(bp); 354bc1a09b8SDarrick J. Wong if (fa) { 355035e00acSDarrick J. Wong trace_xfs_btree_corrupt(bp, _RET_IP_); 356bc1a09b8SDarrick J. Wong xfs_verifier_error(bp, -EFSCORRUPTED, fa); 357035e00acSDarrick J. Wong return; 358035e00acSDarrick J. Wong } 359035e00acSDarrick J. Wong xfs_btree_sblock_calc_crc(bp); 360035e00acSDarrick J. Wong 361035e00acSDarrick J. Wong } 362035e00acSDarrick J. Wong 363035e00acSDarrick J. Wong const struct xfs_buf_ops xfs_rmapbt_buf_ops = { 364035e00acSDarrick J. Wong .name = "xfs_rmapbt", 36539708c20SBrian Foster .magic = { 0, cpu_to_be32(XFS_RMAP_CRC_MAGIC) }, 366035e00acSDarrick J. Wong .verify_read = xfs_rmapbt_read_verify, 367035e00acSDarrick J. Wong .verify_write = xfs_rmapbt_write_verify, 368b5572597SDarrick J. Wong .verify_struct = xfs_rmapbt_verify, 369035e00acSDarrick J. Wong }; 370035e00acSDarrick J. Wong 3714b8ed677SDarrick J. Wong STATIC int 3724b8ed677SDarrick J. Wong xfs_rmapbt_keys_inorder( 3734b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 3744b8ed677SDarrick J. Wong union xfs_btree_key *k1, 3754b8ed677SDarrick J. Wong union xfs_btree_key *k2) 3764b8ed677SDarrick J. Wong { 377c8ce540dSDarrick J. Wong uint32_t x; 378c8ce540dSDarrick J. Wong uint32_t y; 379c8ce540dSDarrick J. Wong uint64_t a; 380c8ce540dSDarrick J. Wong uint64_t b; 3814b8ed677SDarrick J. Wong 3824b8ed677SDarrick J. Wong x = be32_to_cpu(k1->rmap.rm_startblock); 3834b8ed677SDarrick J. Wong y = be32_to_cpu(k2->rmap.rm_startblock); 3844b8ed677SDarrick J. Wong if (x < y) 3854b8ed677SDarrick J. Wong return 1; 3864b8ed677SDarrick J. Wong else if (x > y) 3874b8ed677SDarrick J. Wong return 0; 3884b8ed677SDarrick J. Wong a = be64_to_cpu(k1->rmap.rm_owner); 3894b8ed677SDarrick J. Wong b = be64_to_cpu(k2->rmap.rm_owner); 3904b8ed677SDarrick J. Wong if (a < b) 3914b8ed677SDarrick J. Wong return 1; 3924b8ed677SDarrick J. Wong else if (a > b) 3934b8ed677SDarrick J. Wong return 0; 3944b8ed677SDarrick J. Wong a = XFS_RMAP_OFF(be64_to_cpu(k1->rmap.rm_offset)); 3954b8ed677SDarrick J. Wong b = XFS_RMAP_OFF(be64_to_cpu(k2->rmap.rm_offset)); 3964b8ed677SDarrick J. Wong if (a <= b) 3974b8ed677SDarrick J. Wong return 1; 3984b8ed677SDarrick J. Wong return 0; 3994b8ed677SDarrick J. Wong } 4004b8ed677SDarrick J. Wong 4014b8ed677SDarrick J. Wong STATIC int 4024b8ed677SDarrick J. Wong xfs_rmapbt_recs_inorder( 4034b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 4044b8ed677SDarrick J. Wong union xfs_btree_rec *r1, 4054b8ed677SDarrick J. Wong union xfs_btree_rec *r2) 4064b8ed677SDarrick J. Wong { 407c8ce540dSDarrick J. Wong uint32_t x; 408c8ce540dSDarrick J. Wong uint32_t y; 409c8ce540dSDarrick J. Wong uint64_t a; 410c8ce540dSDarrick J. Wong uint64_t b; 4114b8ed677SDarrick J. Wong 4124b8ed677SDarrick J. Wong x = be32_to_cpu(r1->rmap.rm_startblock); 4134b8ed677SDarrick J. Wong y = be32_to_cpu(r2->rmap.rm_startblock); 4144b8ed677SDarrick J. Wong if (x < y) 4154b8ed677SDarrick J. Wong return 1; 4164b8ed677SDarrick J. Wong else if (x > y) 4174b8ed677SDarrick J. Wong return 0; 4184b8ed677SDarrick J. Wong a = be64_to_cpu(r1->rmap.rm_owner); 4194b8ed677SDarrick J. Wong b = be64_to_cpu(r2->rmap.rm_owner); 4204b8ed677SDarrick J. Wong if (a < b) 4214b8ed677SDarrick J. Wong return 1; 4224b8ed677SDarrick J. Wong else if (a > b) 4234b8ed677SDarrick J. Wong return 0; 4244b8ed677SDarrick J. Wong a = XFS_RMAP_OFF(be64_to_cpu(r1->rmap.rm_offset)); 4254b8ed677SDarrick J. Wong b = XFS_RMAP_OFF(be64_to_cpu(r2->rmap.rm_offset)); 4264b8ed677SDarrick J. Wong if (a <= b) 4274b8ed677SDarrick J. Wong return 1; 4284b8ed677SDarrick J. Wong return 0; 4294b8ed677SDarrick J. Wong } 4304b8ed677SDarrick J. Wong 431035e00acSDarrick J. Wong static const struct xfs_btree_ops xfs_rmapbt_ops = { 432035e00acSDarrick J. Wong .rec_len = sizeof(struct xfs_rmap_rec), 433035e00acSDarrick J. Wong .key_len = 2 * sizeof(struct xfs_rmap_key), 434035e00acSDarrick J. Wong 435035e00acSDarrick J. Wong .dup_cursor = xfs_rmapbt_dup_cursor, 4364b8ed677SDarrick J. Wong .set_root = xfs_rmapbt_set_root, 4374b8ed677SDarrick J. Wong .alloc_block = xfs_rmapbt_alloc_block, 4384b8ed677SDarrick J. Wong .free_block = xfs_rmapbt_free_block, 4394b8ed677SDarrick J. Wong .get_minrecs = xfs_rmapbt_get_minrecs, 4404b8ed677SDarrick J. Wong .get_maxrecs = xfs_rmapbt_get_maxrecs, 4414b8ed677SDarrick J. Wong .init_key_from_rec = xfs_rmapbt_init_key_from_rec, 442cfed56aeSDarrick J. Wong .init_high_key_from_rec = xfs_rmapbt_init_high_key_from_rec, 4434b8ed677SDarrick J. Wong .init_rec_from_cur = xfs_rmapbt_init_rec_from_cur, 4444b8ed677SDarrick J. Wong .init_ptr_from_cur = xfs_rmapbt_init_ptr_from_cur, 4454b8ed677SDarrick J. Wong .key_diff = xfs_rmapbt_key_diff, 446035e00acSDarrick J. Wong .buf_ops = &xfs_rmapbt_buf_ops, 447cfed56aeSDarrick J. Wong .diff_two_keys = xfs_rmapbt_diff_two_keys, 4484b8ed677SDarrick J. Wong .keys_inorder = xfs_rmapbt_keys_inorder, 4494b8ed677SDarrick J. Wong .recs_inorder = xfs_rmapbt_recs_inorder, 450035e00acSDarrick J. Wong }; 451035e00acSDarrick J. Wong 45259d67712SDarrick J. Wong static struct xfs_btree_cur * 45359d67712SDarrick J. Wong xfs_rmapbt_init_common( 45459d67712SDarrick J. Wong struct xfs_mount *mp, 45559d67712SDarrick J. Wong struct xfs_trans *tp, 45659d67712SDarrick J. Wong xfs_agnumber_t agno) 45759d67712SDarrick J. Wong { 45859d67712SDarrick J. Wong struct xfs_btree_cur *cur; 45959d67712SDarrick J. Wong 46059d67712SDarrick J. Wong cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS); 46159d67712SDarrick J. Wong cur->bc_tp = tp; 46259d67712SDarrick J. Wong cur->bc_mp = mp; 46359d67712SDarrick J. Wong /* Overlapping btree; 2 keys per pointer. */ 46459d67712SDarrick J. Wong cur->bc_btnum = XFS_BTNUM_RMAP; 46559d67712SDarrick J. Wong cur->bc_flags = XFS_BTREE_CRC_BLOCKS | XFS_BTREE_OVERLAPPING; 46659d67712SDarrick J. Wong cur->bc_blocklog = mp->m_sb.sb_blocklog; 46759d67712SDarrick J. Wong cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_rmap_2); 46859d67712SDarrick J. Wong cur->bc_ag.agno = agno; 46959d67712SDarrick J. Wong cur->bc_ops = &xfs_rmapbt_ops; 47059d67712SDarrick J. Wong 47159d67712SDarrick J. Wong return cur; 47259d67712SDarrick J. Wong } 47359d67712SDarrick J. Wong 47459d67712SDarrick J. Wong /* Create a new reverse mapping btree cursor. */ 475035e00acSDarrick J. Wong struct xfs_btree_cur * 476035e00acSDarrick J. Wong xfs_rmapbt_init_cursor( 477035e00acSDarrick J. Wong struct xfs_mount *mp, 478035e00acSDarrick J. Wong struct xfs_trans *tp, 479035e00acSDarrick J. Wong struct xfs_buf *agbp, 480035e00acSDarrick J. Wong xfs_agnumber_t agno) 481035e00acSDarrick J. Wong { 4829798f615SChristoph Hellwig struct xfs_agf *agf = agbp->b_addr; 483035e00acSDarrick J. Wong struct xfs_btree_cur *cur; 484035e00acSDarrick J. Wong 48559d67712SDarrick J. Wong cur = xfs_rmapbt_init_common(mp, tp, agno); 486035e00acSDarrick J. Wong cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]); 487576af732SDave Chinner cur->bc_ag.agbp = agbp; 488035e00acSDarrick J. Wong return cur; 489035e00acSDarrick J. Wong } 490035e00acSDarrick J. Wong 49159d67712SDarrick J. Wong /* Create a new reverse mapping btree cursor with a fake root for staging. */ 49259d67712SDarrick J. Wong struct xfs_btree_cur * 49359d67712SDarrick J. Wong xfs_rmapbt_stage_cursor( 49459d67712SDarrick J. Wong struct xfs_mount *mp, 49559d67712SDarrick J. Wong struct xbtree_afakeroot *afake, 49659d67712SDarrick J. Wong xfs_agnumber_t agno) 49759d67712SDarrick J. Wong { 49859d67712SDarrick J. Wong struct xfs_btree_cur *cur; 49959d67712SDarrick J. Wong 50059d67712SDarrick J. Wong cur = xfs_rmapbt_init_common(mp, NULL, agno); 50159d67712SDarrick J. Wong xfs_btree_stage_afakeroot(cur, afake); 50259d67712SDarrick J. Wong return cur; 50359d67712SDarrick J. Wong } 50459d67712SDarrick J. Wong 50559d67712SDarrick J. Wong /* 50659d67712SDarrick J. Wong * Install a new reverse mapping btree root. Caller is responsible for 50759d67712SDarrick J. Wong * invalidating and freeing the old btree blocks. 50859d67712SDarrick J. Wong */ 50959d67712SDarrick J. Wong void 51059d67712SDarrick J. Wong xfs_rmapbt_commit_staged_btree( 51159d67712SDarrick J. Wong struct xfs_btree_cur *cur, 51259d67712SDarrick J. Wong struct xfs_trans *tp, 51359d67712SDarrick J. Wong struct xfs_buf *agbp) 51459d67712SDarrick J. Wong { 51559d67712SDarrick J. Wong struct xfs_agf *agf = agbp->b_addr; 51659d67712SDarrick J. Wong struct xbtree_afakeroot *afake = cur->bc_ag.afake; 51759d67712SDarrick J. Wong 51859d67712SDarrick J. Wong ASSERT(cur->bc_flags & XFS_BTREE_STAGING); 51959d67712SDarrick J. Wong 52059d67712SDarrick J. Wong agf->agf_roots[cur->bc_btnum] = cpu_to_be32(afake->af_root); 52159d67712SDarrick J. Wong agf->agf_levels[cur->bc_btnum] = cpu_to_be32(afake->af_levels); 52259d67712SDarrick J. Wong agf->agf_rmap_blocks = cpu_to_be32(afake->af_blocks); 52359d67712SDarrick J. Wong xfs_alloc_log_agf(tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS | 52459d67712SDarrick J. Wong XFS_AGF_RMAP_BLOCKS); 52559d67712SDarrick J. Wong xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_rmapbt_ops); 52659d67712SDarrick J. Wong } 52759d67712SDarrick J. Wong 528035e00acSDarrick J. Wong /* 529035e00acSDarrick J. Wong * Calculate number of records in an rmap btree block. 530035e00acSDarrick J. Wong */ 531035e00acSDarrick J. Wong int 532035e00acSDarrick J. Wong xfs_rmapbt_maxrecs( 533035e00acSDarrick J. Wong int blocklen, 534035e00acSDarrick J. Wong int leaf) 535035e00acSDarrick J. Wong { 536035e00acSDarrick J. Wong blocklen -= XFS_RMAP_BLOCK_LEN; 537035e00acSDarrick J. Wong 538035e00acSDarrick J. Wong if (leaf) 539035e00acSDarrick J. Wong return blocklen / sizeof(struct xfs_rmap_rec); 540035e00acSDarrick J. Wong return blocklen / 541cfed56aeSDarrick J. Wong (2 * sizeof(struct xfs_rmap_key) + sizeof(xfs_rmap_ptr_t)); 542035e00acSDarrick J. Wong } 543035e00acSDarrick J. Wong 544035e00acSDarrick J. Wong /* Compute the maximum height of an rmap btree. */ 545035e00acSDarrick J. Wong void 546035e00acSDarrick J. Wong xfs_rmapbt_compute_maxlevels( 547035e00acSDarrick J. Wong struct xfs_mount *mp) 548035e00acSDarrick J. Wong { 54946eeb521SDarrick J. Wong /* 55046eeb521SDarrick J. Wong * On a non-reflink filesystem, the maximum number of rmap 55146eeb521SDarrick J. Wong * records is the number of blocks in the AG, hence the max 55246eeb521SDarrick J. Wong * rmapbt height is log_$maxrecs($agblocks). However, with 55346eeb521SDarrick J. Wong * reflink each AG block can have up to 2^32 (per the refcount 55446eeb521SDarrick J. Wong * record format) owners, which means that theoretically we 55546eeb521SDarrick J. Wong * could face up to 2^64 rmap records. 55646eeb521SDarrick J. Wong * 55746eeb521SDarrick J. Wong * That effectively means that the max rmapbt height must be 55846eeb521SDarrick J. Wong * XFS_BTREE_MAXLEVELS. "Fortunately" we'll run out of AG 55946eeb521SDarrick J. Wong * blocks to feed the rmapbt long before the rmapbt reaches 56046eeb521SDarrick J. Wong * maximum height. The reflink code uses ag_resv_critical to 56146eeb521SDarrick J. Wong * disallow reflinking when less than 10% of the per-AG metadata 56246eeb521SDarrick J. Wong * block reservation since the fallback is a regular file copy. 56346eeb521SDarrick J. Wong */ 56446eeb521SDarrick J. Wong if (xfs_sb_version_hasreflink(&mp->m_sb)) 56546eeb521SDarrick J. Wong mp->m_rmap_maxlevels = XFS_BTREE_MAXLEVELS; 56646eeb521SDarrick J. Wong else 567a1f69417SEric Sandeen mp->m_rmap_maxlevels = xfs_btree_compute_maxlevels( 568035e00acSDarrick J. Wong mp->m_rmap_mnr, mp->m_sb.sb_agblocks); 569035e00acSDarrick J. Wong } 57084d69619SDarrick J. Wong 57184d69619SDarrick J. Wong /* Calculate the refcount btree size for some records. */ 57284d69619SDarrick J. Wong xfs_extlen_t 57384d69619SDarrick J. Wong xfs_rmapbt_calc_size( 57484d69619SDarrick J. Wong struct xfs_mount *mp, 57584d69619SDarrick J. Wong unsigned long long len) 57684d69619SDarrick J. Wong { 577a1f69417SEric Sandeen return xfs_btree_calc_size(mp->m_rmap_mnr, len); 57884d69619SDarrick J. Wong } 57984d69619SDarrick J. Wong 58084d69619SDarrick J. Wong /* 58184d69619SDarrick J. Wong * Calculate the maximum refcount btree size. 58284d69619SDarrick J. Wong */ 58384d69619SDarrick J. Wong xfs_extlen_t 58484d69619SDarrick J. Wong xfs_rmapbt_max_size( 58520e73b00SDarrick J. Wong struct xfs_mount *mp, 58620e73b00SDarrick J. Wong xfs_agblock_t agblocks) 58784d69619SDarrick J. Wong { 58884d69619SDarrick J. Wong /* Bail out if we're uninitialized, which can happen in mkfs. */ 58984d69619SDarrick J. Wong if (mp->m_rmap_mxr[0] == 0) 59084d69619SDarrick J. Wong return 0; 59184d69619SDarrick J. Wong 59220e73b00SDarrick J. Wong return xfs_rmapbt_calc_size(mp, agblocks); 59384d69619SDarrick J. Wong } 59484d69619SDarrick J. Wong 59584d69619SDarrick J. Wong /* 59684d69619SDarrick J. Wong * Figure out how many blocks to reserve and how many are used by this btree. 59784d69619SDarrick J. Wong */ 59884d69619SDarrick J. Wong int 59984d69619SDarrick J. Wong xfs_rmapbt_calc_reserves( 60084d69619SDarrick J. Wong struct xfs_mount *mp, 601ebcbef3aSDarrick J. Wong struct xfs_trans *tp, 60284d69619SDarrick J. Wong xfs_agnumber_t agno, 60384d69619SDarrick J. Wong xfs_extlen_t *ask, 60484d69619SDarrick J. Wong xfs_extlen_t *used) 60584d69619SDarrick J. Wong { 60684d69619SDarrick J. Wong struct xfs_buf *agbp; 60784d69619SDarrick J. Wong struct xfs_agf *agf; 60820e73b00SDarrick J. Wong xfs_agblock_t agblocks; 60984d69619SDarrick J. Wong xfs_extlen_t tree_len; 61084d69619SDarrick J. Wong int error; 61184d69619SDarrick J. Wong 61284d69619SDarrick J. Wong if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) 61384d69619SDarrick J. Wong return 0; 61484d69619SDarrick J. Wong 615ebcbef3aSDarrick J. Wong error = xfs_alloc_read_agf(mp, tp, agno, 0, &agbp); 61684d69619SDarrick J. Wong if (error) 61784d69619SDarrick J. Wong return error; 61884d69619SDarrick J. Wong 6199798f615SChristoph Hellwig agf = agbp->b_addr; 62020e73b00SDarrick J. Wong agblocks = be32_to_cpu(agf->agf_length); 62184d69619SDarrick J. Wong tree_len = be32_to_cpu(agf->agf_rmap_blocks); 622ebcbef3aSDarrick J. Wong xfs_trans_brelse(tp, agbp); 62384d69619SDarrick J. Wong 6245cd213b0SDarrick J. Wong /* 6255cd213b0SDarrick J. Wong * The log is permanently allocated, so the space it occupies will 6265cd213b0SDarrick J. Wong * never be available for the kinds of things that would require btree 6275cd213b0SDarrick J. Wong * expansion. We therefore can pretend the space isn't there. 6285cd213b0SDarrick J. Wong */ 6295cd213b0SDarrick J. Wong if (mp->m_sb.sb_logstart && 6305cd213b0SDarrick J. Wong XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart) == agno) 6315cd213b0SDarrick J. Wong agblocks -= mp->m_sb.sb_logblocks; 6325cd213b0SDarrick J. Wong 63320e73b00SDarrick J. Wong /* Reserve 1% of the AG or enough for 1 block per record. */ 63420e73b00SDarrick J. Wong *ask += max(agblocks / 100, xfs_rmapbt_max_size(mp, agblocks)); 63584d69619SDarrick J. Wong *used += tree_len; 63684d69619SDarrick J. Wong 63784d69619SDarrick J. Wong return error; 63884d69619SDarrick J. Wong } 639