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_mount.h" 13035e00acSDarrick J. Wong #include "xfs_trans.h" 14035e00acSDarrick J. Wong #include "xfs_alloc.h" 15035e00acSDarrick J. Wong #include "xfs_btree.h" 1659d67712SDarrick J. Wong #include "xfs_btree_staging.h" 174b8ed677SDarrick J. Wong #include "xfs_rmap.h" 18035e00acSDarrick J. Wong #include "xfs_rmap_btree.h" 19035e00acSDarrick J. Wong #include "xfs_trace.h" 20035e00acSDarrick J. Wong #include "xfs_error.h" 21035e00acSDarrick J. Wong #include "xfs_extent_busy.h" 22*9bbafc71SDave Chinner #include "xfs_ag.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 int btnum = cur->bc_btnum; 6792a00544SGao Xiang struct xfs_perag *pag = agbp->b_pag; 684b8ed677SDarrick J. Wong 694b8ed677SDarrick J. Wong ASSERT(ptr->s != 0); 704b8ed677SDarrick J. Wong 714b8ed677SDarrick J. Wong agf->agf_roots[btnum] = ptr->s; 724b8ed677SDarrick J. Wong be32_add_cpu(&agf->agf_levels[btnum], inc); 734b8ed677SDarrick J. Wong pag->pagf_levels[btnum] += inc; 744b8ed677SDarrick J. Wong 754b8ed677SDarrick J. Wong xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS); 764b8ed677SDarrick J. Wong } 774b8ed677SDarrick J. Wong 784b8ed677SDarrick J. Wong STATIC int 794b8ed677SDarrick J. Wong xfs_rmapbt_alloc_block( 804b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 814b8ed677SDarrick J. Wong union xfs_btree_ptr *start, 824b8ed677SDarrick J. Wong union xfs_btree_ptr *new, 834b8ed677SDarrick J. Wong int *stat) 844b8ed677SDarrick J. Wong { 85576af732SDave Chinner struct xfs_buf *agbp = cur->bc_ag.agbp; 869798f615SChristoph Hellwig struct xfs_agf *agf = agbp->b_addr; 874b8ed677SDarrick J. Wong int error; 884b8ed677SDarrick J. Wong xfs_agblock_t bno; 894b8ed677SDarrick J. Wong 904b8ed677SDarrick J. Wong /* Allocate the new block from the freelist. If we can't, give up. */ 91576af732SDave Chinner error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_ag.agbp, 924b8ed677SDarrick J. Wong &bno, 1); 93e157ebdcSCarlos Maiolino if (error) 944b8ed677SDarrick J. Wong return error; 954b8ed677SDarrick J. Wong 96576af732SDave Chinner trace_xfs_rmapbt_alloc_block(cur->bc_mp, cur->bc_ag.agno, 974b8ed677SDarrick J. Wong bno, 1); 984b8ed677SDarrick J. Wong if (bno == NULLAGBLOCK) { 994b8ed677SDarrick J. Wong *stat = 0; 1004b8ed677SDarrick J. Wong return 0; 1014b8ed677SDarrick J. Wong } 1024b8ed677SDarrick J. Wong 103576af732SDave Chinner xfs_extent_busy_reuse(cur->bc_mp, cur->bc_ag.agno, bno, 1, 1044b8ed677SDarrick J. Wong false); 1054b8ed677SDarrick J. Wong 1064b8ed677SDarrick J. Wong new->s = cpu_to_be32(bno); 107f32866fdSDarrick J. Wong be32_add_cpu(&agf->agf_rmap_blocks, 1); 108f32866fdSDarrick J. Wong xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS); 1094b8ed677SDarrick J. Wong 110576af732SDave Chinner xfs_ag_resv_rmapbt_alloc(cur->bc_mp, cur->bc_ag.agno); 1110ab32086SBrian Foster 1124b8ed677SDarrick J. Wong *stat = 1; 1134b8ed677SDarrick J. Wong return 0; 1144b8ed677SDarrick J. Wong } 1154b8ed677SDarrick J. Wong 1164b8ed677SDarrick J. Wong STATIC int 1174b8ed677SDarrick J. Wong xfs_rmapbt_free_block( 1184b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 1194b8ed677SDarrick J. Wong struct xfs_buf *bp) 1204b8ed677SDarrick J. Wong { 121576af732SDave Chinner struct xfs_buf *agbp = cur->bc_ag.agbp; 1229798f615SChristoph Hellwig struct xfs_agf *agf = agbp->b_addr; 12392a00544SGao Xiang struct xfs_perag *pag; 1244b8ed677SDarrick J. Wong xfs_agblock_t bno; 1254b8ed677SDarrick J. Wong int error; 1264b8ed677SDarrick J. Wong 1274b8ed677SDarrick J. Wong bno = xfs_daddr_to_agbno(cur->bc_mp, XFS_BUF_ADDR(bp)); 128576af732SDave Chinner trace_xfs_rmapbt_free_block(cur->bc_mp, cur->bc_ag.agno, 1294b8ed677SDarrick J. Wong bno, 1); 130f32866fdSDarrick J. Wong be32_add_cpu(&agf->agf_rmap_blocks, -1); 131f32866fdSDarrick J. Wong xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_RMAP_BLOCKS); 1324b8ed677SDarrick J. Wong error = xfs_alloc_put_freelist(cur->bc_tp, agbp, NULL, bno, 1); 1334b8ed677SDarrick J. Wong if (error) 1344b8ed677SDarrick J. Wong return error; 1354b8ed677SDarrick J. Wong 1364b8ed677SDarrick J. Wong xfs_extent_busy_insert(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1, 1374b8ed677SDarrick J. Wong XFS_EXTENT_BUSY_SKIP_DISCARD); 1384b8ed677SDarrick J. Wong 13992a00544SGao Xiang pag = cur->bc_ag.agbp->b_pag; 14092a00544SGao Xiang xfs_ag_resv_free_extent(pag, XFS_AG_RESV_RMAPBT, NULL, 1); 1414b8ed677SDarrick J. Wong return 0; 1424b8ed677SDarrick J. Wong } 1434b8ed677SDarrick J. Wong 1444b8ed677SDarrick J. Wong STATIC int 1454b8ed677SDarrick J. Wong xfs_rmapbt_get_minrecs( 1464b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 1474b8ed677SDarrick J. Wong int level) 1484b8ed677SDarrick J. Wong { 1494b8ed677SDarrick J. Wong return cur->bc_mp->m_rmap_mnr[level != 0]; 1504b8ed677SDarrick J. Wong } 1514b8ed677SDarrick J. Wong 1524b8ed677SDarrick J. Wong STATIC int 1534b8ed677SDarrick J. Wong xfs_rmapbt_get_maxrecs( 1544b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 1554b8ed677SDarrick J. Wong int level) 1564b8ed677SDarrick J. Wong { 1574b8ed677SDarrick J. Wong return cur->bc_mp->m_rmap_mxr[level != 0]; 1584b8ed677SDarrick J. Wong } 1594b8ed677SDarrick J. Wong 1604b8ed677SDarrick J. Wong STATIC void 1614b8ed677SDarrick J. Wong xfs_rmapbt_init_key_from_rec( 1624b8ed677SDarrick J. Wong union xfs_btree_key *key, 1634b8ed677SDarrick J. Wong union xfs_btree_rec *rec) 1644b8ed677SDarrick J. Wong { 1654b8ed677SDarrick J. Wong key->rmap.rm_startblock = rec->rmap.rm_startblock; 1664b8ed677SDarrick J. Wong key->rmap.rm_owner = rec->rmap.rm_owner; 1674b8ed677SDarrick J. Wong key->rmap.rm_offset = rec->rmap.rm_offset; 1684b8ed677SDarrick J. Wong } 1694b8ed677SDarrick J. Wong 170cfed56aeSDarrick J. Wong /* 171cfed56aeSDarrick J. Wong * The high key for a reverse mapping record can be computed by shifting 172cfed56aeSDarrick J. Wong * the startblock and offset to the highest value that would still map 173cfed56aeSDarrick J. Wong * to that record. In practice this means that we add blockcount-1 to 174cfed56aeSDarrick J. Wong * the startblock for all records, and if the record is for a data/attr 175cfed56aeSDarrick J. Wong * fork mapping, we add blockcount-1 to the offset too. 176cfed56aeSDarrick J. Wong */ 177cfed56aeSDarrick J. Wong STATIC void 178cfed56aeSDarrick J. Wong xfs_rmapbt_init_high_key_from_rec( 179cfed56aeSDarrick J. Wong union xfs_btree_key *key, 180cfed56aeSDarrick J. Wong union xfs_btree_rec *rec) 181cfed56aeSDarrick J. Wong { 182c8ce540dSDarrick J. Wong uint64_t off; 183cfed56aeSDarrick J. Wong int adj; 184cfed56aeSDarrick J. Wong 185cfed56aeSDarrick J. Wong adj = be32_to_cpu(rec->rmap.rm_blockcount) - 1; 186cfed56aeSDarrick J. Wong 187cfed56aeSDarrick J. Wong key->rmap.rm_startblock = rec->rmap.rm_startblock; 188cfed56aeSDarrick J. Wong be32_add_cpu(&key->rmap.rm_startblock, adj); 189cfed56aeSDarrick J. Wong key->rmap.rm_owner = rec->rmap.rm_owner; 190cfed56aeSDarrick J. Wong key->rmap.rm_offset = rec->rmap.rm_offset; 191cfed56aeSDarrick J. Wong if (XFS_RMAP_NON_INODE_OWNER(be64_to_cpu(rec->rmap.rm_owner)) || 192cfed56aeSDarrick J. Wong XFS_RMAP_IS_BMBT_BLOCK(be64_to_cpu(rec->rmap.rm_offset))) 193cfed56aeSDarrick J. Wong return; 194cfed56aeSDarrick J. Wong off = be64_to_cpu(key->rmap.rm_offset); 195cfed56aeSDarrick J. Wong off = (XFS_RMAP_OFF(off) + adj) | (off & ~XFS_RMAP_OFF_MASK); 196cfed56aeSDarrick J. Wong key->rmap.rm_offset = cpu_to_be64(off); 197cfed56aeSDarrick J. Wong } 198cfed56aeSDarrick J. Wong 1994b8ed677SDarrick J. Wong STATIC void 2004b8ed677SDarrick J. Wong xfs_rmapbt_init_rec_from_cur( 2014b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 2024b8ed677SDarrick J. Wong union xfs_btree_rec *rec) 2034b8ed677SDarrick J. Wong { 2044b8ed677SDarrick J. Wong rec->rmap.rm_startblock = cpu_to_be32(cur->bc_rec.r.rm_startblock); 2054b8ed677SDarrick J. Wong rec->rmap.rm_blockcount = cpu_to_be32(cur->bc_rec.r.rm_blockcount); 2064b8ed677SDarrick J. Wong rec->rmap.rm_owner = cpu_to_be64(cur->bc_rec.r.rm_owner); 2074b8ed677SDarrick J. Wong rec->rmap.rm_offset = cpu_to_be64( 2084b8ed677SDarrick J. Wong xfs_rmap_irec_offset_pack(&cur->bc_rec.r)); 2094b8ed677SDarrick J. Wong } 2104b8ed677SDarrick J. Wong 2114b8ed677SDarrick J. Wong STATIC void 2124b8ed677SDarrick J. Wong xfs_rmapbt_init_ptr_from_cur( 2134b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 2144b8ed677SDarrick J. Wong union xfs_btree_ptr *ptr) 2154b8ed677SDarrick J. Wong { 216576af732SDave Chinner struct xfs_agf *agf = cur->bc_ag.agbp->b_addr; 2174b8ed677SDarrick J. Wong 218576af732SDave Chinner ASSERT(cur->bc_ag.agno == be32_to_cpu(agf->agf_seqno)); 2194b8ed677SDarrick J. Wong 2204b8ed677SDarrick J. Wong ptr->s = agf->agf_roots[cur->bc_btnum]; 2214b8ed677SDarrick J. Wong } 2224b8ed677SDarrick J. Wong 223c8ce540dSDarrick J. Wong STATIC int64_t 2244b8ed677SDarrick J. Wong xfs_rmapbt_key_diff( 2254b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 2264b8ed677SDarrick J. Wong union xfs_btree_key *key) 2274b8ed677SDarrick J. Wong { 2284b8ed677SDarrick J. Wong struct xfs_rmap_irec *rec = &cur->bc_rec.r; 2294b8ed677SDarrick J. Wong struct xfs_rmap_key *kp = &key->rmap; 2304b8ed677SDarrick J. Wong __u64 x, y; 231c8ce540dSDarrick J. Wong int64_t d; 2324b8ed677SDarrick J. Wong 233c8ce540dSDarrick J. Wong d = (int64_t)be32_to_cpu(kp->rm_startblock) - rec->rm_startblock; 2344b8ed677SDarrick J. Wong if (d) 2354b8ed677SDarrick J. Wong return d; 2364b8ed677SDarrick J. Wong 2374b8ed677SDarrick J. Wong x = be64_to_cpu(kp->rm_owner); 2384b8ed677SDarrick J. Wong y = rec->rm_owner; 2394b8ed677SDarrick J. Wong if (x > y) 2404b8ed677SDarrick J. Wong return 1; 2414b8ed677SDarrick J. Wong else if (y > x) 2424b8ed677SDarrick J. Wong return -1; 2434b8ed677SDarrick J. Wong 244eb840907SDarrick J. Wong x = XFS_RMAP_OFF(be64_to_cpu(kp->rm_offset)); 245eb840907SDarrick J. Wong y = rec->rm_offset; 2464b8ed677SDarrick J. Wong if (x > y) 2474b8ed677SDarrick J. Wong return 1; 2484b8ed677SDarrick J. Wong else if (y > x) 2494b8ed677SDarrick J. Wong return -1; 2504b8ed677SDarrick J. Wong return 0; 2514b8ed677SDarrick J. Wong } 2524b8ed677SDarrick J. Wong 253c8ce540dSDarrick J. Wong STATIC int64_t 254cfed56aeSDarrick J. Wong xfs_rmapbt_diff_two_keys( 255cfed56aeSDarrick J. Wong struct xfs_btree_cur *cur, 256cfed56aeSDarrick J. Wong union xfs_btree_key *k1, 257cfed56aeSDarrick J. Wong union xfs_btree_key *k2) 258cfed56aeSDarrick J. Wong { 259cfed56aeSDarrick J. Wong struct xfs_rmap_key *kp1 = &k1->rmap; 260cfed56aeSDarrick J. Wong struct xfs_rmap_key *kp2 = &k2->rmap; 261c8ce540dSDarrick J. Wong int64_t d; 262cfed56aeSDarrick J. Wong __u64 x, y; 263cfed56aeSDarrick J. Wong 264c8ce540dSDarrick J. Wong d = (int64_t)be32_to_cpu(kp1->rm_startblock) - 265cfed56aeSDarrick J. Wong be32_to_cpu(kp2->rm_startblock); 266cfed56aeSDarrick J. Wong if (d) 267cfed56aeSDarrick J. Wong return d; 268cfed56aeSDarrick J. Wong 269cfed56aeSDarrick J. Wong x = be64_to_cpu(kp1->rm_owner); 270cfed56aeSDarrick J. Wong y = be64_to_cpu(kp2->rm_owner); 271cfed56aeSDarrick J. Wong if (x > y) 272cfed56aeSDarrick J. Wong return 1; 273cfed56aeSDarrick J. Wong else if (y > x) 274cfed56aeSDarrick J. Wong return -1; 275cfed56aeSDarrick J. Wong 276eb840907SDarrick J. Wong x = XFS_RMAP_OFF(be64_to_cpu(kp1->rm_offset)); 277eb840907SDarrick J. Wong y = XFS_RMAP_OFF(be64_to_cpu(kp2->rm_offset)); 278cfed56aeSDarrick J. Wong if (x > y) 279cfed56aeSDarrick J. Wong return 1; 280cfed56aeSDarrick J. Wong else if (y > x) 281cfed56aeSDarrick J. Wong return -1; 282cfed56aeSDarrick J. Wong return 0; 283cfed56aeSDarrick J. Wong } 284cfed56aeSDarrick J. Wong 285a6a781a5SDarrick J. Wong static xfs_failaddr_t 286035e00acSDarrick J. Wong xfs_rmapbt_verify( 287035e00acSDarrick J. Wong struct xfs_buf *bp) 288035e00acSDarrick J. Wong { 289dbd329f1SChristoph Hellwig struct xfs_mount *mp = bp->b_mount; 290035e00acSDarrick J. Wong struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); 291035e00acSDarrick J. Wong struct xfs_perag *pag = bp->b_pag; 292a6a781a5SDarrick J. Wong xfs_failaddr_t fa; 293035e00acSDarrick J. Wong unsigned int level; 294035e00acSDarrick J. Wong 295035e00acSDarrick J. Wong /* 296035e00acSDarrick J. Wong * magic number and level verification 297035e00acSDarrick J. Wong * 298035e00acSDarrick J. Wong * During growfs operations, we can't verify the exact level or owner as 299035e00acSDarrick J. Wong * the perag is not fully initialised and hence not attached to the 300035e00acSDarrick J. Wong * buffer. In this case, check against the maximum tree depth. 301035e00acSDarrick J. Wong * 302035e00acSDarrick J. Wong * Similarly, during log recovery we will have a perag structure 303035e00acSDarrick J. Wong * attached, but the agf information will not yet have been initialised 304035e00acSDarrick J. Wong * from the on disk AGF. Again, we can only check against maximum limits 305035e00acSDarrick J. Wong * in this case. 306035e00acSDarrick J. Wong */ 30739708c20SBrian Foster if (!xfs_verify_magic(bp, block->bb_magic)) 308a6a781a5SDarrick J. Wong return __this_address; 309035e00acSDarrick J. Wong 310035e00acSDarrick J. Wong if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) 311a6a781a5SDarrick J. Wong return __this_address; 312a6a781a5SDarrick J. Wong fa = xfs_btree_sblock_v5hdr_verify(bp); 313a6a781a5SDarrick J. Wong if (fa) 314a6a781a5SDarrick J. Wong return fa; 315035e00acSDarrick J. Wong 316035e00acSDarrick J. Wong level = be16_to_cpu(block->bb_level); 317035e00acSDarrick J. Wong if (pag && pag->pagf_init) { 318035e00acSDarrick J. Wong if (level >= pag->pagf_levels[XFS_BTNUM_RMAPi]) 319a6a781a5SDarrick J. Wong return __this_address; 320035e00acSDarrick J. Wong } else if (level >= mp->m_rmap_maxlevels) 321a6a781a5SDarrick J. Wong return __this_address; 322035e00acSDarrick J. Wong 323035e00acSDarrick J. Wong return xfs_btree_sblock_verify(bp, mp->m_rmap_mxr[level != 0]); 324035e00acSDarrick J. Wong } 325035e00acSDarrick J. Wong 326035e00acSDarrick J. Wong static void 327035e00acSDarrick J. Wong xfs_rmapbt_read_verify( 328035e00acSDarrick J. Wong struct xfs_buf *bp) 329035e00acSDarrick J. Wong { 330bc1a09b8SDarrick J. Wong xfs_failaddr_t fa; 331bc1a09b8SDarrick J. Wong 332035e00acSDarrick J. Wong if (!xfs_btree_sblock_verify_crc(bp)) 333bc1a09b8SDarrick J. Wong xfs_verifier_error(bp, -EFSBADCRC, __this_address); 334bc1a09b8SDarrick J. Wong else { 335bc1a09b8SDarrick J. Wong fa = xfs_rmapbt_verify(bp); 336bc1a09b8SDarrick J. Wong if (fa) 337bc1a09b8SDarrick J. Wong xfs_verifier_error(bp, -EFSCORRUPTED, fa); 338bc1a09b8SDarrick J. Wong } 339035e00acSDarrick J. Wong 34031ca03c9SDarrick J. Wong if (bp->b_error) 341035e00acSDarrick J. Wong trace_xfs_btree_corrupt(bp, _RET_IP_); 342035e00acSDarrick J. Wong } 343035e00acSDarrick J. Wong 344035e00acSDarrick J. Wong static void 345035e00acSDarrick J. Wong xfs_rmapbt_write_verify( 346035e00acSDarrick J. Wong struct xfs_buf *bp) 347035e00acSDarrick J. Wong { 348bc1a09b8SDarrick J. Wong xfs_failaddr_t fa; 349bc1a09b8SDarrick J. Wong 350bc1a09b8SDarrick J. Wong fa = xfs_rmapbt_verify(bp); 351bc1a09b8SDarrick J. Wong if (fa) { 352035e00acSDarrick J. Wong trace_xfs_btree_corrupt(bp, _RET_IP_); 353bc1a09b8SDarrick J. Wong xfs_verifier_error(bp, -EFSCORRUPTED, fa); 354035e00acSDarrick J. Wong return; 355035e00acSDarrick J. Wong } 356035e00acSDarrick J. Wong xfs_btree_sblock_calc_crc(bp); 357035e00acSDarrick J. Wong 358035e00acSDarrick J. Wong } 359035e00acSDarrick J. Wong 360035e00acSDarrick J. Wong const struct xfs_buf_ops xfs_rmapbt_buf_ops = { 361035e00acSDarrick J. Wong .name = "xfs_rmapbt", 36239708c20SBrian Foster .magic = { 0, cpu_to_be32(XFS_RMAP_CRC_MAGIC) }, 363035e00acSDarrick J. Wong .verify_read = xfs_rmapbt_read_verify, 364035e00acSDarrick J. Wong .verify_write = xfs_rmapbt_write_verify, 365b5572597SDarrick J. Wong .verify_struct = xfs_rmapbt_verify, 366035e00acSDarrick J. Wong }; 367035e00acSDarrick J. Wong 3684b8ed677SDarrick J. Wong STATIC int 3694b8ed677SDarrick J. Wong xfs_rmapbt_keys_inorder( 3704b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 3714b8ed677SDarrick J. Wong union xfs_btree_key *k1, 3724b8ed677SDarrick J. Wong union xfs_btree_key *k2) 3734b8ed677SDarrick J. Wong { 374c8ce540dSDarrick J. Wong uint32_t x; 375c8ce540dSDarrick J. Wong uint32_t y; 376c8ce540dSDarrick J. Wong uint64_t a; 377c8ce540dSDarrick J. Wong uint64_t b; 3784b8ed677SDarrick J. Wong 3794b8ed677SDarrick J. Wong x = be32_to_cpu(k1->rmap.rm_startblock); 3804b8ed677SDarrick J. Wong y = be32_to_cpu(k2->rmap.rm_startblock); 3814b8ed677SDarrick J. Wong if (x < y) 3824b8ed677SDarrick J. Wong return 1; 3834b8ed677SDarrick J. Wong else if (x > y) 3844b8ed677SDarrick J. Wong return 0; 3854b8ed677SDarrick J. Wong a = be64_to_cpu(k1->rmap.rm_owner); 3864b8ed677SDarrick J. Wong b = be64_to_cpu(k2->rmap.rm_owner); 3874b8ed677SDarrick J. Wong if (a < b) 3884b8ed677SDarrick J. Wong return 1; 3894b8ed677SDarrick J. Wong else if (a > b) 3904b8ed677SDarrick J. Wong return 0; 391eb840907SDarrick J. Wong a = XFS_RMAP_OFF(be64_to_cpu(k1->rmap.rm_offset)); 392eb840907SDarrick J. Wong b = XFS_RMAP_OFF(be64_to_cpu(k2->rmap.rm_offset)); 3934b8ed677SDarrick J. Wong if (a <= b) 3944b8ed677SDarrick J. Wong return 1; 3954b8ed677SDarrick J. Wong return 0; 3964b8ed677SDarrick J. Wong } 3974b8ed677SDarrick J. Wong 3984b8ed677SDarrick J. Wong STATIC int 3994b8ed677SDarrick J. Wong xfs_rmapbt_recs_inorder( 4004b8ed677SDarrick J. Wong struct xfs_btree_cur *cur, 4014b8ed677SDarrick J. Wong union xfs_btree_rec *r1, 4024b8ed677SDarrick J. Wong union xfs_btree_rec *r2) 4034b8ed677SDarrick J. Wong { 404c8ce540dSDarrick J. Wong uint32_t x; 405c8ce540dSDarrick J. Wong uint32_t y; 406c8ce540dSDarrick J. Wong uint64_t a; 407c8ce540dSDarrick J. Wong uint64_t b; 4084b8ed677SDarrick J. Wong 4094b8ed677SDarrick J. Wong x = be32_to_cpu(r1->rmap.rm_startblock); 4104b8ed677SDarrick J. Wong y = be32_to_cpu(r2->rmap.rm_startblock); 4114b8ed677SDarrick J. Wong if (x < y) 4124b8ed677SDarrick J. Wong return 1; 4134b8ed677SDarrick J. Wong else if (x > y) 4144b8ed677SDarrick J. Wong return 0; 4154b8ed677SDarrick J. Wong a = be64_to_cpu(r1->rmap.rm_owner); 4164b8ed677SDarrick J. Wong b = be64_to_cpu(r2->rmap.rm_owner); 4174b8ed677SDarrick J. Wong if (a < b) 4184b8ed677SDarrick J. Wong return 1; 4194b8ed677SDarrick J. Wong else if (a > b) 4204b8ed677SDarrick J. Wong return 0; 421eb840907SDarrick J. Wong a = XFS_RMAP_OFF(be64_to_cpu(r1->rmap.rm_offset)); 422eb840907SDarrick J. Wong b = XFS_RMAP_OFF(be64_to_cpu(r2->rmap.rm_offset)); 4234b8ed677SDarrick J. Wong if (a <= b) 4244b8ed677SDarrick J. Wong return 1; 4254b8ed677SDarrick J. Wong return 0; 4264b8ed677SDarrick J. Wong } 4274b8ed677SDarrick J. Wong 428035e00acSDarrick J. Wong static const struct xfs_btree_ops xfs_rmapbt_ops = { 429035e00acSDarrick J. Wong .rec_len = sizeof(struct xfs_rmap_rec), 430035e00acSDarrick J. Wong .key_len = 2 * sizeof(struct xfs_rmap_key), 431035e00acSDarrick J. Wong 432035e00acSDarrick J. Wong .dup_cursor = xfs_rmapbt_dup_cursor, 4334b8ed677SDarrick J. Wong .set_root = xfs_rmapbt_set_root, 4344b8ed677SDarrick J. Wong .alloc_block = xfs_rmapbt_alloc_block, 4354b8ed677SDarrick J. Wong .free_block = xfs_rmapbt_free_block, 4364b8ed677SDarrick J. Wong .get_minrecs = xfs_rmapbt_get_minrecs, 4374b8ed677SDarrick J. Wong .get_maxrecs = xfs_rmapbt_get_maxrecs, 4384b8ed677SDarrick J. Wong .init_key_from_rec = xfs_rmapbt_init_key_from_rec, 439cfed56aeSDarrick J. Wong .init_high_key_from_rec = xfs_rmapbt_init_high_key_from_rec, 4404b8ed677SDarrick J. Wong .init_rec_from_cur = xfs_rmapbt_init_rec_from_cur, 4414b8ed677SDarrick J. Wong .init_ptr_from_cur = xfs_rmapbt_init_ptr_from_cur, 4424b8ed677SDarrick J. Wong .key_diff = xfs_rmapbt_key_diff, 443035e00acSDarrick J. Wong .buf_ops = &xfs_rmapbt_buf_ops, 444cfed56aeSDarrick J. Wong .diff_two_keys = xfs_rmapbt_diff_two_keys, 4454b8ed677SDarrick J. Wong .keys_inorder = xfs_rmapbt_keys_inorder, 4464b8ed677SDarrick J. Wong .recs_inorder = xfs_rmapbt_recs_inorder, 447035e00acSDarrick J. Wong }; 448035e00acSDarrick J. Wong 44959d67712SDarrick J. Wong static struct xfs_btree_cur * 45059d67712SDarrick J. Wong xfs_rmapbt_init_common( 45159d67712SDarrick J. Wong struct xfs_mount *mp, 45259d67712SDarrick J. Wong struct xfs_trans *tp, 45359d67712SDarrick J. Wong xfs_agnumber_t agno) 45459d67712SDarrick J. Wong { 45559d67712SDarrick J. Wong struct xfs_btree_cur *cur; 45659d67712SDarrick J. Wong 45732a2b11fSCarlos Maiolino cur = kmem_cache_zalloc(xfs_btree_cur_zone, GFP_NOFS | __GFP_NOFAIL); 45859d67712SDarrick J. Wong cur->bc_tp = tp; 45959d67712SDarrick J. Wong cur->bc_mp = mp; 46059d67712SDarrick J. Wong /* Overlapping btree; 2 keys per pointer. */ 46159d67712SDarrick J. Wong cur->bc_btnum = XFS_BTNUM_RMAP; 46259d67712SDarrick J. Wong cur->bc_flags = XFS_BTREE_CRC_BLOCKS | XFS_BTREE_OVERLAPPING; 46359d67712SDarrick J. Wong cur->bc_blocklog = mp->m_sb.sb_blocklog; 46459d67712SDarrick J. Wong cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_rmap_2); 46559d67712SDarrick J. Wong cur->bc_ag.agno = agno; 46659d67712SDarrick J. Wong cur->bc_ops = &xfs_rmapbt_ops; 46759d67712SDarrick J. Wong 46859d67712SDarrick J. Wong return cur; 46959d67712SDarrick J. Wong } 47059d67712SDarrick J. Wong 47159d67712SDarrick J. Wong /* Create a new reverse mapping btree cursor. */ 472035e00acSDarrick J. Wong struct xfs_btree_cur * 473035e00acSDarrick J. Wong xfs_rmapbt_init_cursor( 474035e00acSDarrick J. Wong struct xfs_mount *mp, 475035e00acSDarrick J. Wong struct xfs_trans *tp, 476035e00acSDarrick J. Wong struct xfs_buf *agbp, 477035e00acSDarrick J. Wong xfs_agnumber_t agno) 478035e00acSDarrick J. Wong { 4799798f615SChristoph Hellwig struct xfs_agf *agf = agbp->b_addr; 480035e00acSDarrick J. Wong struct xfs_btree_cur *cur; 481035e00acSDarrick J. Wong 48259d67712SDarrick J. Wong cur = xfs_rmapbt_init_common(mp, tp, agno); 483035e00acSDarrick J. Wong cur->bc_nlevels = be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]); 484576af732SDave Chinner cur->bc_ag.agbp = agbp; 485035e00acSDarrick J. Wong return cur; 486035e00acSDarrick J. Wong } 487035e00acSDarrick J. Wong 48859d67712SDarrick J. Wong /* Create a new reverse mapping btree cursor with a fake root for staging. */ 48959d67712SDarrick J. Wong struct xfs_btree_cur * 49059d67712SDarrick J. Wong xfs_rmapbt_stage_cursor( 49159d67712SDarrick J. Wong struct xfs_mount *mp, 49259d67712SDarrick J. Wong struct xbtree_afakeroot *afake, 49359d67712SDarrick J. Wong xfs_agnumber_t agno) 49459d67712SDarrick J. Wong { 49559d67712SDarrick J. Wong struct xfs_btree_cur *cur; 49659d67712SDarrick J. Wong 49759d67712SDarrick J. Wong cur = xfs_rmapbt_init_common(mp, NULL, agno); 49859d67712SDarrick J. Wong xfs_btree_stage_afakeroot(cur, afake); 49959d67712SDarrick J. Wong return cur; 50059d67712SDarrick J. Wong } 50159d67712SDarrick J. Wong 50259d67712SDarrick J. Wong /* 50359d67712SDarrick J. Wong * Install a new reverse mapping btree root. Caller is responsible for 50459d67712SDarrick J. Wong * invalidating and freeing the old btree blocks. 50559d67712SDarrick J. Wong */ 50659d67712SDarrick J. Wong void 50759d67712SDarrick J. Wong xfs_rmapbt_commit_staged_btree( 50859d67712SDarrick J. Wong struct xfs_btree_cur *cur, 50959d67712SDarrick J. Wong struct xfs_trans *tp, 51059d67712SDarrick J. Wong struct xfs_buf *agbp) 51159d67712SDarrick J. Wong { 51259d67712SDarrick J. Wong struct xfs_agf *agf = agbp->b_addr; 51359d67712SDarrick J. Wong struct xbtree_afakeroot *afake = cur->bc_ag.afake; 51459d67712SDarrick J. Wong 51559d67712SDarrick J. Wong ASSERT(cur->bc_flags & XFS_BTREE_STAGING); 51659d67712SDarrick J. Wong 51759d67712SDarrick J. Wong agf->agf_roots[cur->bc_btnum] = cpu_to_be32(afake->af_root); 51859d67712SDarrick J. Wong agf->agf_levels[cur->bc_btnum] = cpu_to_be32(afake->af_levels); 51959d67712SDarrick J. Wong agf->agf_rmap_blocks = cpu_to_be32(afake->af_blocks); 52059d67712SDarrick J. Wong xfs_alloc_log_agf(tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS | 52159d67712SDarrick J. Wong XFS_AGF_RMAP_BLOCKS); 52259d67712SDarrick J. Wong xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_rmapbt_ops); 52359d67712SDarrick J. Wong } 52459d67712SDarrick J. Wong 525035e00acSDarrick J. Wong /* 526035e00acSDarrick J. Wong * Calculate number of records in an rmap btree block. 527035e00acSDarrick J. Wong */ 528035e00acSDarrick J. Wong int 529035e00acSDarrick J. Wong xfs_rmapbt_maxrecs( 530035e00acSDarrick J. Wong int blocklen, 531035e00acSDarrick J. Wong int leaf) 532035e00acSDarrick J. Wong { 533035e00acSDarrick J. Wong blocklen -= XFS_RMAP_BLOCK_LEN; 534035e00acSDarrick J. Wong 535035e00acSDarrick J. Wong if (leaf) 536035e00acSDarrick J. Wong return blocklen / sizeof(struct xfs_rmap_rec); 537035e00acSDarrick J. Wong return blocklen / 538cfed56aeSDarrick J. Wong (2 * sizeof(struct xfs_rmap_key) + sizeof(xfs_rmap_ptr_t)); 539035e00acSDarrick J. Wong } 540035e00acSDarrick J. Wong 541035e00acSDarrick J. Wong /* Compute the maximum height of an rmap btree. */ 542035e00acSDarrick J. Wong void 543035e00acSDarrick J. Wong xfs_rmapbt_compute_maxlevels( 544035e00acSDarrick J. Wong struct xfs_mount *mp) 545035e00acSDarrick J. Wong { 54646eeb521SDarrick J. Wong /* 54746eeb521SDarrick J. Wong * On a non-reflink filesystem, the maximum number of rmap 54846eeb521SDarrick J. Wong * records is the number of blocks in the AG, hence the max 54946eeb521SDarrick J. Wong * rmapbt height is log_$maxrecs($agblocks). However, with 55046eeb521SDarrick J. Wong * reflink each AG block can have up to 2^32 (per the refcount 55146eeb521SDarrick J. Wong * record format) owners, which means that theoretically we 55246eeb521SDarrick J. Wong * could face up to 2^64 rmap records. 55346eeb521SDarrick J. Wong * 55446eeb521SDarrick J. Wong * That effectively means that the max rmapbt height must be 55546eeb521SDarrick J. Wong * XFS_BTREE_MAXLEVELS. "Fortunately" we'll run out of AG 55646eeb521SDarrick J. Wong * blocks to feed the rmapbt long before the rmapbt reaches 55746eeb521SDarrick J. Wong * maximum height. The reflink code uses ag_resv_critical to 55846eeb521SDarrick J. Wong * disallow reflinking when less than 10% of the per-AG metadata 55946eeb521SDarrick J. Wong * block reservation since the fallback is a regular file copy. 56046eeb521SDarrick J. Wong */ 56146eeb521SDarrick J. Wong if (xfs_sb_version_hasreflink(&mp->m_sb)) 56246eeb521SDarrick J. Wong mp->m_rmap_maxlevels = XFS_BTREE_MAXLEVELS; 56346eeb521SDarrick J. Wong else 564a1f69417SEric Sandeen mp->m_rmap_maxlevels = xfs_btree_compute_maxlevels( 565035e00acSDarrick J. Wong mp->m_rmap_mnr, mp->m_sb.sb_agblocks); 566035e00acSDarrick J. Wong } 56784d69619SDarrick J. Wong 56884d69619SDarrick J. Wong /* Calculate the refcount btree size for some records. */ 56984d69619SDarrick J. Wong xfs_extlen_t 57084d69619SDarrick J. Wong xfs_rmapbt_calc_size( 57184d69619SDarrick J. Wong struct xfs_mount *mp, 57284d69619SDarrick J. Wong unsigned long long len) 57384d69619SDarrick J. Wong { 574a1f69417SEric Sandeen return xfs_btree_calc_size(mp->m_rmap_mnr, len); 57584d69619SDarrick J. Wong } 57684d69619SDarrick J. Wong 57784d69619SDarrick J. Wong /* 57884d69619SDarrick J. Wong * Calculate the maximum refcount btree size. 57984d69619SDarrick J. Wong */ 58084d69619SDarrick J. Wong xfs_extlen_t 58184d69619SDarrick J. Wong xfs_rmapbt_max_size( 58220e73b00SDarrick J. Wong struct xfs_mount *mp, 58320e73b00SDarrick J. Wong xfs_agblock_t agblocks) 58484d69619SDarrick J. Wong { 58584d69619SDarrick J. Wong /* Bail out if we're uninitialized, which can happen in mkfs. */ 58684d69619SDarrick J. Wong if (mp->m_rmap_mxr[0] == 0) 58784d69619SDarrick J. Wong return 0; 58884d69619SDarrick J. Wong 58920e73b00SDarrick J. Wong return xfs_rmapbt_calc_size(mp, agblocks); 59084d69619SDarrick J. Wong } 59184d69619SDarrick J. Wong 59284d69619SDarrick J. Wong /* 59384d69619SDarrick J. Wong * Figure out how many blocks to reserve and how many are used by this btree. 59484d69619SDarrick J. Wong */ 59584d69619SDarrick J. Wong int 59684d69619SDarrick J. Wong xfs_rmapbt_calc_reserves( 59784d69619SDarrick J. Wong struct xfs_mount *mp, 598ebcbef3aSDarrick J. Wong struct xfs_trans *tp, 59984d69619SDarrick J. Wong xfs_agnumber_t agno, 60084d69619SDarrick J. Wong xfs_extlen_t *ask, 60184d69619SDarrick J. Wong xfs_extlen_t *used) 60284d69619SDarrick J. Wong { 60384d69619SDarrick J. Wong struct xfs_buf *agbp; 60484d69619SDarrick J. Wong struct xfs_agf *agf; 60520e73b00SDarrick J. Wong xfs_agblock_t agblocks; 60684d69619SDarrick J. Wong xfs_extlen_t tree_len; 60784d69619SDarrick J. Wong int error; 60884d69619SDarrick J. Wong 60984d69619SDarrick J. Wong if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) 61084d69619SDarrick J. Wong return 0; 61184d69619SDarrick J. Wong 612ebcbef3aSDarrick J. Wong error = xfs_alloc_read_agf(mp, tp, agno, 0, &agbp); 61384d69619SDarrick J. Wong if (error) 61484d69619SDarrick J. Wong return error; 61584d69619SDarrick J. Wong 6169798f615SChristoph Hellwig agf = agbp->b_addr; 61720e73b00SDarrick J. Wong agblocks = be32_to_cpu(agf->agf_length); 61884d69619SDarrick J. Wong tree_len = be32_to_cpu(agf->agf_rmap_blocks); 619ebcbef3aSDarrick J. Wong xfs_trans_brelse(tp, agbp); 62084d69619SDarrick J. Wong 6215cd213b0SDarrick J. Wong /* 6225cd213b0SDarrick J. Wong * The log is permanently allocated, so the space it occupies will 6235cd213b0SDarrick J. Wong * never be available for the kinds of things that would require btree 6245cd213b0SDarrick J. Wong * expansion. We therefore can pretend the space isn't there. 6255cd213b0SDarrick J. Wong */ 6265cd213b0SDarrick J. Wong if (mp->m_sb.sb_logstart && 6275cd213b0SDarrick J. Wong XFS_FSB_TO_AGNO(mp, mp->m_sb.sb_logstart) == agno) 6285cd213b0SDarrick J. Wong agblocks -= mp->m_sb.sb_logblocks; 6295cd213b0SDarrick J. Wong 63020e73b00SDarrick J. Wong /* Reserve 1% of the AG or enough for 1 block per record. */ 63120e73b00SDarrick J. Wong *ask += max(agblocks / 100, xfs_rmapbt_max_size(mp, agblocks)); 63284d69619SDarrick J. Wong *used += tree_len; 63384d69619SDarrick J. Wong 63484d69619SDarrick J. Wong return error; 63584d69619SDarrick J. Wong } 636