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-rw-r--r--fs/xfs/libxfs/xfs_refcount_btree.c451
1 files changed, 451 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 000000000000..453bb2757ec2
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_refcount_btree.c
@@ -0,0 +1,451 @@
+/*
+ * Copyright (C) 2016 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+#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_sb.h"
+#include "xfs_mount.h"
+#include "xfs_btree.h"
+#include "xfs_bmap.h"
+#include "xfs_refcount_btree.h"
+#include "xfs_alloc.h"
+#include "xfs_error.h"
+#include "xfs_trace.h"
+#include "xfs_cksum.h"
+#include "xfs_trans.h"
+#include "xfs_bit.h"
+#include "xfs_rmap.h"
+
+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_private.a.agbp, cur->bc_private.a.agno,
+ cur->bc_private.a.dfops);
+}
+
+STATIC void
+xfs_refcountbt_set_root(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_ptr *ptr,
+ int inc)
+{
+ struct xfs_buf *agbp = cur->bc_private.a.agbp;
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
+ xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
+ struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno);
+
+ ASSERT(ptr->s != 0);
+
+ agf->agf_refcount_root = ptr->s;
+ be32_add_cpu(&agf->agf_refcount_level, inc);
+ pag->pagf_refcount_level += inc;
+ xfs_perag_put(pag);
+
+ 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,
+ union xfs_btree_ptr *start,
+ union xfs_btree_ptr *new,
+ int *stat)
+{
+ struct xfs_buf *agbp = cur->bc_private.a.agbp;
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
+ struct xfs_alloc_arg args; /* block allocation args */
+ int error; /* error return value */
+
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
+
+ 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_private.a.agno,
+ xfs_refc_block(args.mp));
+ args.firstblock = args.fsbno;
+ xfs_rmap_ag_owner(&args.oinfo, XFS_RMAP_OWN_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_private.a.agno,
+ args.agbno, 1);
+ if (args.fsbno == NULLFSBLOCK) {
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+ *stat = 0;
+ return 0;
+ }
+ ASSERT(args.agno == cur->bc_private.a.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);
+
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+ *stat = 1;
+ return 0;
+
+out_error:
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_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_private.a.agbp;
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
+ xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
+ struct xfs_owner_info oinfo;
+ int error;
+
+ trace_xfs_refcountbt_free_block(cur->bc_mp, cur->bc_private.a.agno,
+ XFS_FSB_TO_AGBNO(cur->bc_mp, fsbno), 1);
+ xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_REFC);
+ 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, &oinfo,
+ 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,
+ 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,
+ 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)
+{
+ rec->refc.rc_startblock = cpu_to_be32(cur->bc_rec.rc.rc_startblock);
+ 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 = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
+
+ ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
+ ASSERT(agf->agf_refcount_root != 0);
+
+ ptr->s = agf->agf_refcount_root;
+}
+
+STATIC __int64_t
+xfs_refcountbt_key_diff(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_key *key)
+{
+ struct xfs_refcount_irec *rec = &cur->bc_rec.rc;
+ struct xfs_refcount_key *kp = &key->refc;
+
+ return (__int64_t)be32_to_cpu(kp->rc_startblock) - rec->rc_startblock;
+}
+
+STATIC __int64_t
+xfs_refcountbt_diff_two_keys(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_key *k1,
+ union xfs_btree_key *k2)
+{
+ return (__int64_t)be32_to_cpu(k1->refc.rc_startblock) -
+ be32_to_cpu(k2->refc.rc_startblock);
+}
+
+STATIC bool
+xfs_refcountbt_verify(
+ struct xfs_buf *bp)
+{
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+ struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
+ struct xfs_perag *pag = bp->b_pag;
+ unsigned int level;
+
+ if (block->bb_magic != cpu_to_be32(XFS_REFC_CRC_MAGIC))
+ return false;
+
+ if (!xfs_sb_version_hasreflink(&mp->m_sb))
+ return false;
+ if (!xfs_btree_sblock_v5hdr_verify(bp))
+ return false;
+
+ level = be16_to_cpu(block->bb_level);
+ if (pag && pag->pagf_init) {
+ if (level >= pag->pagf_refcount_level)
+ return false;
+ } else if (level >= mp->m_refc_maxlevels)
+ return false;
+
+ return xfs_btree_sblock_verify(bp, mp->m_refc_mxr[level != 0]);
+}
+
+STATIC void
+xfs_refcountbt_read_verify(
+ struct xfs_buf *bp)
+{
+ if (!xfs_btree_sblock_verify_crc(bp))
+ xfs_buf_ioerror(bp, -EFSBADCRC);
+ else if (!xfs_refcountbt_verify(bp))
+ xfs_buf_ioerror(bp, -EFSCORRUPTED);
+
+ if (bp->b_error) {
+ trace_xfs_btree_corrupt(bp, _RET_IP_);
+ xfs_verifier_error(bp);
+ }
+}
+
+STATIC void
+xfs_refcountbt_write_verify(
+ struct xfs_buf *bp)
+{
+ if (!xfs_refcountbt_verify(bp)) {
+ trace_xfs_btree_corrupt(bp, _RET_IP_);
+ xfs_buf_ioerror(bp, -EFSCORRUPTED);
+ xfs_verifier_error(bp);
+ return;
+ }
+ xfs_btree_sblock_calc_crc(bp);
+
+}
+
+const struct xfs_buf_ops xfs_refcountbt_buf_ops = {
+ .name = "xfs_refcountbt",
+ .verify_read = xfs_refcountbt_read_verify,
+ .verify_write = xfs_refcountbt_write_verify,
+};
+
+#if defined(DEBUG) || defined(XFS_WARN)
+STATIC int
+xfs_refcountbt_keys_inorder(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_key *k1,
+ 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,
+ union xfs_btree_rec *r1,
+ 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);
+}
+#endif
+
+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,
+#if defined(DEBUG) || defined(XFS_WARN)
+ .keys_inorder = xfs_refcountbt_keys_inorder,
+ .recs_inorder = xfs_refcountbt_recs_inorder,
+#endif
+};
+
+/*
+ * Allocate a new refcount btree cursor.
+ */
+struct xfs_btree_cur *
+xfs_refcountbt_init_cursor(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct xfs_buf *agbp,
+ xfs_agnumber_t agno,
+ struct xfs_defer_ops *dfops)
+{
+ struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
+ struct xfs_btree_cur *cur;
+
+ ASSERT(agno != NULLAGNUMBER);
+ ASSERT(agno < mp->m_sb.sb_agcount);
+ cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS);
+
+ cur->bc_tp = tp;
+ cur->bc_mp = mp;
+ cur->bc_btnum = XFS_BTNUM_REFC;
+ cur->bc_blocklog = mp->m_sb.sb_blocklog;
+ cur->bc_ops = &xfs_refcountbt_ops;
+
+ cur->bc_nlevels = be32_to_cpu(agf->agf_refcount_level);
+
+ cur->bc_private.a.agbp = agbp;
+ cur->bc_private.a.agno = agno;
+ cur->bc_private.a.dfops = dfops;
+ cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
+
+ cur->bc_private.a.priv.refc.nr_ops = 0;
+ cur->bc_private.a.priv.refc.shape_changes = 0;
+
+ return cur;
+}
+
+/*
+ * Calculate the number of records in a refcount btree block.
+ */
+int
+xfs_refcountbt_maxrecs(
+ struct xfs_mount *mp,
+ int blocklen,
+ bool leaf)
+{
+ blocklen -= XFS_REFCOUNT_BLOCK_LEN;
+
+ if (leaf)
+ return blocklen / sizeof(struct xfs_refcount_rec);
+ return blocklen / (sizeof(struct xfs_refcount_key) +
+ sizeof(xfs_refcount_ptr_t));
+}
+
+/* Compute the maximum height of a refcount btree. */
+void
+xfs_refcountbt_compute_maxlevels(
+ struct xfs_mount *mp)
+{
+ mp->m_refc_maxlevels = xfs_btree_compute_maxlevels(mp,
+ mp->m_refc_mnr, mp->m_sb.sb_agblocks);
+}
+
+/* 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, mp->m_refc_mnr, len);
+}
+
+/*
+ * Calculate the maximum refcount btree size.
+ */
+xfs_extlen_t
+xfs_refcountbt_max_size(
+ struct xfs_mount *mp)
+{
+ /* 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, mp->m_sb.sb_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,
+ xfs_agnumber_t agno,
+ xfs_extlen_t *ask,
+ xfs_extlen_t *used)
+{
+ struct xfs_buf *agbp;
+ struct xfs_agf *agf;
+ xfs_extlen_t tree_len;
+ int error;
+
+ if (!xfs_sb_version_hasreflink(&mp->m_sb))
+ return 0;
+
+ *ask += xfs_refcountbt_max_size(mp);
+
+ error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agbp);
+ if (error)
+ return error;
+
+ agf = XFS_BUF_TO_AGF(agbp);
+ tree_len = be32_to_cpu(agf->agf_refcount_blocks);
+ xfs_buf_relse(agbp);
+
+ *used += tree_len;
+
+ return error;
+}