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-rw-r--r--fs/xfs/libxfs/xfs_refcount_btree.c545
1 files changed, 545 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c
new file mode 100644
index 000000000..e1f789866
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_refcount_btree.c
@@ -0,0 +1,545 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2016 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_btree.h"
+#include "xfs_btree_staging.h"
+#include "xfs_refcount_btree.h"
+#include "xfs_refcount.h"
+#include "xfs_alloc.h"
+#include "xfs_error.h"
+#include "xfs_trace.h"
+#include "xfs_trans.h"
+#include "xfs_bit.h"
+#include "xfs_rmap.h"
+#include "xfs_ag.h"
+
+static struct kmem_cache *xfs_refcountbt_cur_cache;
+
+static struct xfs_btree_cur *
+xfs_refcountbt_dup_cursor(
+ struct xfs_btree_cur *cur)
+{
+ return xfs_refcountbt_init_cursor(cur->bc_mp, cur->bc_tp,
+ cur->bc_ag.agbp, cur->bc_ag.pag);
+}
+
+STATIC void
+xfs_refcountbt_set_root(
+ struct xfs_btree_cur *cur,
+ const union xfs_btree_ptr *ptr,
+ int inc)
+{
+ struct xfs_buf *agbp = cur->bc_ag.agbp;
+ struct xfs_agf *agf = agbp->b_addr;
+ struct xfs_perag *pag = agbp->b_pag;
+
+ ASSERT(ptr->s != 0);
+
+ agf->agf_refcount_root = ptr->s;
+ be32_add_cpu(&agf->agf_refcount_level, inc);
+ pag->pagf_refcount_level += inc;
+
+ xfs_alloc_log_agf(cur->bc_tp, agbp,
+ XFS_AGF_REFCOUNT_ROOT | XFS_AGF_REFCOUNT_LEVEL);
+}
+
+STATIC int
+xfs_refcountbt_alloc_block(
+ struct xfs_btree_cur *cur,
+ const union xfs_btree_ptr *start,
+ union xfs_btree_ptr *new,
+ int *stat)
+{
+ struct xfs_buf *agbp = cur->bc_ag.agbp;
+ struct xfs_agf *agf = agbp->b_addr;
+ struct xfs_alloc_arg args; /* block allocation args */
+ int error; /* error return value */
+
+ memset(&args, 0, sizeof(args));
+ args.tp = cur->bc_tp;
+ args.mp = cur->bc_mp;
+ args.type = XFS_ALLOCTYPE_NEAR_BNO;
+ args.fsbno = XFS_AGB_TO_FSB(cur->bc_mp, cur->bc_ag.pag->pag_agno,
+ xfs_refc_block(args.mp));
+ args.oinfo = XFS_RMAP_OINFO_REFC;
+ args.minlen = args.maxlen = args.prod = 1;
+ args.resv = XFS_AG_RESV_METADATA;
+
+ error = xfs_alloc_vextent(&args);
+ if (error)
+ goto out_error;
+ trace_xfs_refcountbt_alloc_block(cur->bc_mp, cur->bc_ag.pag->pag_agno,
+ args.agbno, 1);
+ if (args.fsbno == NULLFSBLOCK) {
+ *stat = 0;
+ return 0;
+ }
+ ASSERT(args.agno == cur->bc_ag.pag->pag_agno);
+ ASSERT(args.len == 1);
+
+ new->s = cpu_to_be32(args.agbno);
+ be32_add_cpu(&agf->agf_refcount_blocks, 1);
+ xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
+
+ *stat = 1;
+ return 0;
+
+out_error:
+ return error;
+}
+
+STATIC int
+xfs_refcountbt_free_block(
+ struct xfs_btree_cur *cur,
+ struct xfs_buf *bp)
+{
+ struct xfs_mount *mp = cur->bc_mp;
+ struct xfs_buf *agbp = cur->bc_ag.agbp;
+ struct xfs_agf *agf = agbp->b_addr;
+ xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, xfs_buf_daddr(bp));
+ int error;
+
+ trace_xfs_refcountbt_free_block(cur->bc_mp, cur->bc_ag.pag->pag_agno,
+ XFS_FSB_TO_AGBNO(cur->bc_mp, fsbno), 1);
+ be32_add_cpu(&agf->agf_refcount_blocks, -1);
+ xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_REFCOUNT_BLOCKS);
+ error = xfs_free_extent(cur->bc_tp, fsbno, 1, &XFS_RMAP_OINFO_REFC,
+ XFS_AG_RESV_METADATA);
+ if (error)
+ return error;
+
+ return error;
+}
+
+STATIC int
+xfs_refcountbt_get_minrecs(
+ struct xfs_btree_cur *cur,
+ int level)
+{
+ return cur->bc_mp->m_refc_mnr[level != 0];
+}
+
+STATIC int
+xfs_refcountbt_get_maxrecs(
+ struct xfs_btree_cur *cur,
+ int level)
+{
+ return cur->bc_mp->m_refc_mxr[level != 0];
+}
+
+STATIC void
+xfs_refcountbt_init_key_from_rec(
+ union xfs_btree_key *key,
+ const union xfs_btree_rec *rec)
+{
+ key->refc.rc_startblock = rec->refc.rc_startblock;
+}
+
+STATIC void
+xfs_refcountbt_init_high_key_from_rec(
+ union xfs_btree_key *key,
+ const union xfs_btree_rec *rec)
+{
+ __u32 x;
+
+ x = be32_to_cpu(rec->refc.rc_startblock);
+ x += be32_to_cpu(rec->refc.rc_blockcount) - 1;
+ key->refc.rc_startblock = cpu_to_be32(x);
+}
+
+STATIC void
+xfs_refcountbt_init_rec_from_cur(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_rec *rec)
+{
+ const struct xfs_refcount_irec *irec = &cur->bc_rec.rc;
+ uint32_t start;
+
+ start = xfs_refcount_encode_startblock(irec->rc_startblock,
+ irec->rc_domain);
+ rec->refc.rc_startblock = cpu_to_be32(start);
+ rec->refc.rc_blockcount = cpu_to_be32(cur->bc_rec.rc.rc_blockcount);
+ rec->refc.rc_refcount = cpu_to_be32(cur->bc_rec.rc.rc_refcount);
+}
+
+STATIC void
+xfs_refcountbt_init_ptr_from_cur(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_ptr *ptr)
+{
+ struct xfs_agf *agf = cur->bc_ag.agbp->b_addr;
+
+ ASSERT(cur->bc_ag.pag->pag_agno == be32_to_cpu(agf->agf_seqno));
+
+ ptr->s = agf->agf_refcount_root;
+}
+
+STATIC int64_t
+xfs_refcountbt_key_diff(
+ struct xfs_btree_cur *cur,
+ const union xfs_btree_key *key)
+{
+ const struct xfs_refcount_key *kp = &key->refc;
+ const struct xfs_refcount_irec *irec = &cur->bc_rec.rc;
+ uint32_t start;
+
+ start = xfs_refcount_encode_startblock(irec->rc_startblock,
+ irec->rc_domain);
+ return (int64_t)be32_to_cpu(kp->rc_startblock) - start;
+}
+
+STATIC int64_t
+xfs_refcountbt_diff_two_keys(
+ struct xfs_btree_cur *cur,
+ const union xfs_btree_key *k1,
+ const union xfs_btree_key *k2)
+{
+ return (int64_t)be32_to_cpu(k1->refc.rc_startblock) -
+ be32_to_cpu(k2->refc.rc_startblock);
+}
+
+STATIC xfs_failaddr_t
+xfs_refcountbt_verify(
+ struct xfs_buf *bp)
+{
+ struct xfs_mount *mp = bp->b_mount;
+ struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
+ struct xfs_perag *pag = bp->b_pag;
+ xfs_failaddr_t fa;
+ unsigned int level;
+
+ if (!xfs_verify_magic(bp, block->bb_magic))
+ return __this_address;
+
+ if (!xfs_has_reflink(mp))
+ return __this_address;
+ fa = xfs_btree_sblock_v5hdr_verify(bp);
+ if (fa)
+ return fa;
+
+ level = be16_to_cpu(block->bb_level);
+ if (pag && pag->pagf_init) {
+ if (level >= pag->pagf_refcount_level)
+ return __this_address;
+ } else if (level >= mp->m_refc_maxlevels)
+ return __this_address;
+
+ return xfs_btree_sblock_verify(bp, mp->m_refc_mxr[level != 0]);
+}
+
+STATIC void
+xfs_refcountbt_read_verify(
+ struct xfs_buf *bp)
+{
+ xfs_failaddr_t fa;
+
+ if (!xfs_btree_sblock_verify_crc(bp))
+ xfs_verifier_error(bp, -EFSBADCRC, __this_address);
+ else {
+ fa = xfs_refcountbt_verify(bp);
+ if (fa)
+ xfs_verifier_error(bp, -EFSCORRUPTED, fa);
+ }
+
+ if (bp->b_error)
+ trace_xfs_btree_corrupt(bp, _RET_IP_);
+}
+
+STATIC void
+xfs_refcountbt_write_verify(
+ struct xfs_buf *bp)
+{
+ xfs_failaddr_t fa;
+
+ fa = xfs_refcountbt_verify(bp);
+ if (fa) {
+ trace_xfs_btree_corrupt(bp, _RET_IP_);
+ xfs_verifier_error(bp, -EFSCORRUPTED, fa);
+ return;
+ }
+ xfs_btree_sblock_calc_crc(bp);
+
+}
+
+const struct xfs_buf_ops xfs_refcountbt_buf_ops = {
+ .name = "xfs_refcountbt",
+ .magic = { 0, cpu_to_be32(XFS_REFC_CRC_MAGIC) },
+ .verify_read = xfs_refcountbt_read_verify,
+ .verify_write = xfs_refcountbt_write_verify,
+ .verify_struct = xfs_refcountbt_verify,
+};
+
+STATIC int
+xfs_refcountbt_keys_inorder(
+ struct xfs_btree_cur *cur,
+ const union xfs_btree_key *k1,
+ const union xfs_btree_key *k2)
+{
+ return be32_to_cpu(k1->refc.rc_startblock) <
+ be32_to_cpu(k2->refc.rc_startblock);
+}
+
+STATIC int
+xfs_refcountbt_recs_inorder(
+ struct xfs_btree_cur *cur,
+ const union xfs_btree_rec *r1,
+ const union xfs_btree_rec *r2)
+{
+ return be32_to_cpu(r1->refc.rc_startblock) +
+ be32_to_cpu(r1->refc.rc_blockcount) <=
+ be32_to_cpu(r2->refc.rc_startblock);
+}
+
+static const struct xfs_btree_ops xfs_refcountbt_ops = {
+ .rec_len = sizeof(struct xfs_refcount_rec),
+ .key_len = sizeof(struct xfs_refcount_key),
+
+ .dup_cursor = xfs_refcountbt_dup_cursor,
+ .set_root = xfs_refcountbt_set_root,
+ .alloc_block = xfs_refcountbt_alloc_block,
+ .free_block = xfs_refcountbt_free_block,
+ .get_minrecs = xfs_refcountbt_get_minrecs,
+ .get_maxrecs = xfs_refcountbt_get_maxrecs,
+ .init_key_from_rec = xfs_refcountbt_init_key_from_rec,
+ .init_high_key_from_rec = xfs_refcountbt_init_high_key_from_rec,
+ .init_rec_from_cur = xfs_refcountbt_init_rec_from_cur,
+ .init_ptr_from_cur = xfs_refcountbt_init_ptr_from_cur,
+ .key_diff = xfs_refcountbt_key_diff,
+ .buf_ops = &xfs_refcountbt_buf_ops,
+ .diff_two_keys = xfs_refcountbt_diff_two_keys,
+ .keys_inorder = xfs_refcountbt_keys_inorder,
+ .recs_inorder = xfs_refcountbt_recs_inorder,
+};
+
+/*
+ * Initialize a new refcount btree cursor.
+ */
+static struct xfs_btree_cur *
+xfs_refcountbt_init_common(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct xfs_perag *pag)
+{
+ struct xfs_btree_cur *cur;
+
+ ASSERT(pag->pag_agno < mp->m_sb.sb_agcount);
+
+ cur = xfs_btree_alloc_cursor(mp, tp, XFS_BTNUM_REFC,
+ mp->m_refc_maxlevels, xfs_refcountbt_cur_cache);
+ cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_refcbt_2);
+
+ cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
+
+ /* take a reference for the cursor */
+ atomic_inc(&pag->pag_ref);
+ cur->bc_ag.pag = pag;
+
+ cur->bc_ag.refc.nr_ops = 0;
+ cur->bc_ag.refc.shape_changes = 0;
+ cur->bc_ops = &xfs_refcountbt_ops;
+ return cur;
+}
+
+/* Create a btree cursor. */
+struct xfs_btree_cur *
+xfs_refcountbt_init_cursor(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct xfs_buf *agbp,
+ struct xfs_perag *pag)
+{
+ struct xfs_agf *agf = agbp->b_addr;
+ struct xfs_btree_cur *cur;
+
+ cur = xfs_refcountbt_init_common(mp, tp, pag);
+ cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level);
+ cur->bc_ag.agbp = agbp;
+ return cur;
+}
+
+/* Create a btree cursor with a fake root for staging. */
+struct xfs_btree_cur *
+xfs_refcountbt_stage_cursor(
+ struct xfs_mount *mp,
+ struct xbtree_afakeroot *afake,
+ struct xfs_perag *pag)
+{
+ struct xfs_btree_cur *cur;
+
+ cur = xfs_refcountbt_init_common(mp, NULL, pag);
+ xfs_btree_stage_afakeroot(cur, afake);
+ return cur;
+}
+
+/*
+ * Swap in the new btree root. Once we pass this point the newly rebuilt btree
+ * is in place and we have to kill off all the old btree blocks.
+ */
+void
+xfs_refcountbt_commit_staged_btree(
+ struct xfs_btree_cur *cur,
+ struct xfs_trans *tp,
+ struct xfs_buf *agbp)
+{
+ struct xfs_agf *agf = agbp->b_addr;
+ struct xbtree_afakeroot *afake = cur->bc_ag.afake;
+
+ ASSERT(cur->bc_flags & XFS_BTREE_STAGING);
+
+ agf->agf_refcount_root = cpu_to_be32(afake->af_root);
+ agf->agf_refcount_level = cpu_to_be32(afake->af_levels);
+ agf->agf_refcount_blocks = cpu_to_be32(afake->af_blocks);
+ xfs_alloc_log_agf(tp, agbp, XFS_AGF_REFCOUNT_BLOCKS |
+ XFS_AGF_REFCOUNT_ROOT |
+ XFS_AGF_REFCOUNT_LEVEL);
+ xfs_btree_commit_afakeroot(cur, tp, agbp, &xfs_refcountbt_ops);
+}
+
+/* Calculate number of records in a refcount btree block. */
+static inline unsigned int
+xfs_refcountbt_block_maxrecs(
+ unsigned int blocklen,
+ bool leaf)
+{
+ if (leaf)
+ return blocklen / sizeof(struct xfs_refcount_rec);
+ return blocklen / (sizeof(struct xfs_refcount_key) +
+ sizeof(xfs_refcount_ptr_t));
+}
+
+/*
+ * Calculate the number of records in a refcount btree block.
+ */
+int
+xfs_refcountbt_maxrecs(
+ int blocklen,
+ bool leaf)
+{
+ blocklen -= XFS_REFCOUNT_BLOCK_LEN;
+ return xfs_refcountbt_block_maxrecs(blocklen, leaf);
+}
+
+/* Compute the max possible height of the maximally sized refcount btree. */
+unsigned int
+xfs_refcountbt_maxlevels_ondisk(void)
+{
+ unsigned int minrecs[2];
+ unsigned int blocklen;
+
+ blocklen = XFS_MIN_CRC_BLOCKSIZE - XFS_BTREE_SBLOCK_CRC_LEN;
+
+ minrecs[0] = xfs_refcountbt_block_maxrecs(blocklen, true) / 2;
+ minrecs[1] = xfs_refcountbt_block_maxrecs(blocklen, false) / 2;
+
+ return xfs_btree_compute_maxlevels(minrecs, XFS_MAX_CRC_AG_BLOCKS);
+}
+
+/* Compute the maximum height of a refcount btree. */
+void
+xfs_refcountbt_compute_maxlevels(
+ struct xfs_mount *mp)
+{
+ if (!xfs_has_reflink(mp)) {
+ mp->m_refc_maxlevels = 0;
+ return;
+ }
+
+ mp->m_refc_maxlevels = xfs_btree_compute_maxlevels(
+ mp->m_refc_mnr, mp->m_sb.sb_agblocks);
+ ASSERT(mp->m_refc_maxlevels <= xfs_refcountbt_maxlevels_ondisk());
+}
+
+/* Calculate the refcount btree size for some records. */
+xfs_extlen_t
+xfs_refcountbt_calc_size(
+ struct xfs_mount *mp,
+ unsigned long long len)
+{
+ return xfs_btree_calc_size(mp->m_refc_mnr, len);
+}
+
+/*
+ * Calculate the maximum refcount btree size.
+ */
+xfs_extlen_t
+xfs_refcountbt_max_size(
+ struct xfs_mount *mp,
+ xfs_agblock_t agblocks)
+{
+ /* Bail out if we're uninitialized, which can happen in mkfs. */
+ if (mp->m_refc_mxr[0] == 0)
+ return 0;
+
+ return xfs_refcountbt_calc_size(mp, agblocks);
+}
+
+/*
+ * Figure out how many blocks to reserve and how many are used by this btree.
+ */
+int
+xfs_refcountbt_calc_reserves(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct xfs_perag *pag,
+ xfs_extlen_t *ask,
+ xfs_extlen_t *used)
+{
+ struct xfs_buf *agbp;
+ struct xfs_agf *agf;
+ xfs_agblock_t agblocks;
+ xfs_extlen_t tree_len;
+ int error;
+
+ if (!xfs_has_reflink(mp))
+ return 0;
+
+ error = xfs_alloc_read_agf(pag, tp, 0, &agbp);
+ if (error)
+ return error;
+
+ agf = agbp->b_addr;
+ agblocks = be32_to_cpu(agf->agf_length);
+ tree_len = be32_to_cpu(agf->agf_refcount_blocks);
+ xfs_trans_brelse(tp, agbp);
+
+ /*
+ * The log is permanently allocated, so the space it occupies will
+ * never be available for the kinds of things that would require btree
+ * expansion. We therefore can pretend the space isn't there.
+ */
+ if (xfs_ag_contains_log(mp, pag->pag_agno))
+ agblocks -= mp->m_sb.sb_logblocks;
+
+ *ask += xfs_refcountbt_max_size(mp, agblocks);
+ *used += tree_len;
+
+ return error;
+}
+
+int __init
+xfs_refcountbt_init_cur_cache(void)
+{
+ xfs_refcountbt_cur_cache = kmem_cache_create("xfs_refcbt_cur",
+ xfs_btree_cur_sizeof(xfs_refcountbt_maxlevels_ondisk()),
+ 0, 0, NULL);
+
+ if (!xfs_refcountbt_cur_cache)
+ return -ENOMEM;
+ return 0;
+}
+
+void
+xfs_refcountbt_destroy_cur_cache(void)
+{
+ kmem_cache_destroy(xfs_refcountbt_cur_cache);
+ xfs_refcountbt_cur_cache = NULL;
+}