Implement the generic btree operations required to manipulate refcount
btree blocks. The implementation is similar to the bmapbt, though it
will only allocate and free blocks from the AG.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/Makefile | 1
fs/xfs/libxfs/xfs_refcount.c | 169 ++++++++++++++++++++++++++++++
fs/xfs/libxfs/xfs_refcount.h | 29 +++++
fs/xfs/libxfs/xfs_refcount_btree.c | 203 ++++++++++++++++++++++++++++++++++++
4 files changed, 402 insertions(+)
create mode 100644 fs/xfs/libxfs/xfs_refcount.c
create mode 100644 fs/xfs/libxfs/xfs_refcount.h
diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 9bac577..7d84c62 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -53,6 +53,7 @@ xfs-y += $(addprefix libxfs/, \
xfs_log_rlimit.o \
xfs_rmap.o \
xfs_rmap_btree.o \
+ xfs_refcount.o \
xfs_refcount_btree.o \
xfs_sb.o \
xfs_symlink_remote.o \
diff --git a/fs/xfs/libxfs/xfs_refcount.c b/fs/xfs/libxfs/xfs_refcount.c
new file mode 100644
index 0000000..b3f2c25
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_refcount.c
@@ -0,0 +1,169 @@
+/*
+ * Copyright (c) 2000-2001,2005 Silicon Graphics, Inc.
+ * Copyright (c) 2015 Oracle.
+ * All Rights Reserved.
+ *
+ * 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.
+ *
+ * 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_refcount.h"
+
+/**
+ * xfs_refcountbt_lookup_le() -- Look up the first record less than or equal to
+ * [bno, len] in the btree given by cur.
+ * @cur: refcount btree cursor
+ * @bno: AG block number to look up
+ * @stat: set to 1 if successful, 0 otherwise
+ */
+int
+xfs_refcountbt_lookup_le(
+ struct xfs_btree_cur *cur,
+ xfs_agblock_t bno,
+ int *stat)
+{
+ trace_xfs_refcountbt_lookup(cur->bc_mp, cur->bc_private.a.agno, bno,
+ XFS_LOOKUP_LE);
+ cur->bc_rec.rc.rc_startblock = bno;
+ cur->bc_rec.rc.rc_blockcount = 0;
+ return xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat);
+}
+
+/**
+ * xfs_refcountbt_lookup_ge() -- Look up the first record greater than or equal
+ * to [bno, len] in the btree given by cur.
+ * @cur: refcount btree cursor
+ * @bno: AG block number to look up
+ * @stat: set to 1 if successful, 0 otherwise
+ */
+int /* error */
+xfs_refcountbt_lookup_ge(
+ struct xfs_btree_cur *cur, /* btree cursor */
+ xfs_agblock_t bno, /* starting block of extent */
+ int *stat) /* success/failure */
+{
+ trace_xfs_refcountbt_lookup(cur->bc_mp, cur->bc_private.a.agno, bno,
+ XFS_LOOKUP_GE);
+ cur->bc_rec.rc.rc_startblock = bno;
+ cur->bc_rec.rc.rc_blockcount = 0;
+ return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
+}
+
+/**
+ * xfs_refcountbt_get_rec() -- Get the data from the pointed-to record.
+ *
+ * @cur: refcount btree cursor
+ * @irec: set to the record currently pointed to by the btree cursor
+ * @stat: set to 1 if successful, 0 otherwise
+ */
+int
+xfs_refcountbt_get_rec(
+ struct xfs_btree_cur *cur,
+ struct xfs_refcount_irec *irec,
+ int *stat)
+{
+ union xfs_btree_rec *rec;
+ int error;
+
+ error = xfs_btree_get_rec(cur, &rec, stat);
+ if (!error && *stat == 1) {
+ irec->rc_startblock = be32_to_cpu(rec->refc.rc_startblock);
+ irec->rc_blockcount = be32_to_cpu(rec->refc.rc_blockcount);
+ irec->rc_refcount = be32_to_cpu(rec->refc.rc_refcount);
+ trace_xfs_refcountbt_get(cur->bc_mp, cur->bc_private.a.agno,
+ irec);
+ }
+ return error;
+}
+
+/*
+ * Update the record referred to by cur to the value given
+ * by [bno, len, refcount].
+ * This either works (return 0) or gets an EFSCORRUPTED error.
+ */
+STATIC int
+xfs_refcountbt_update(
+ struct xfs_btree_cur *cur,
+ struct xfs_refcount_irec *irec)
+{
+ union xfs_btree_rec rec;
+
+ trace_xfs_refcountbt_update(cur->bc_mp, cur->bc_private.a.agno, irec);
+ rec.refc.rc_startblock = cpu_to_be32(irec->rc_startblock);
+ rec.refc.rc_blockcount = cpu_to_be32(irec->rc_blockcount);
+ rec.refc.rc_refcount = cpu_to_be32(irec->rc_refcount);
+ return xfs_btree_update(cur, &rec);
+}
+
+/*
+ * Insert the record referred to by cur to the value given
+ * by [bno, len, refcount].
+ * This either works (return 0) or gets an EFSCORRUPTED error.
+ */
+STATIC int
+xfs_refcountbt_insert(
+ struct xfs_btree_cur *cur,
+ struct xfs_refcount_irec *irec,
+ int *i)
+{
+ trace_xfs_refcountbt_insert(cur->bc_mp, cur->bc_private.a.agno, irec);
+ cur->bc_rec.rc.rc_startblock = irec->rc_startblock;
+ cur->bc_rec.rc.rc_blockcount = irec->rc_blockcount;
+ cur->bc_rec.rc.rc_refcount = irec->rc_refcount;
+ return xfs_btree_insert(cur, i);
+}
+
+/*
+ * Remove the record referred to by cur, then set the pointer to the spot
+ * where the record could be re-inserted, in case we want to increment or
+ * decrement the cursor.
+ * This either works (return 0) or gets an EFSCORRUPTED error.
+ */
+STATIC int
+xfs_refcountbt_delete(
+ struct xfs_btree_cur *cur,
+ int *i)
+{
+ struct xfs_refcount_irec irec;
+ int found_rec;
+ int error;
+
+ error = xfs_refcountbt_get_rec(cur, &irec, &found_rec);
+ if (error)
+ return error;
+ XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, found_rec == 1, out_error);
+ trace_xfs_refcountbt_delete(cur->bc_mp, cur->bc_private.a.agno, &irec);
+ error = xfs_btree_delete(cur, i);
+ XFS_WANT_CORRUPTED_GOTO(cur->bc_mp, *i == 1, out_error);
+ if (error)
+ return error;
+ error = xfs_refcountbt_lookup_ge(cur, irec.rc_startblock, &found_rec);
+out_error:
+ return error;
+}
diff --git a/fs/xfs/libxfs/xfs_refcount.h b/fs/xfs/libxfs/xfs_refcount.h
new file mode 100644
index 0000000..033a9b1
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_refcount.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2000,2005 Silicon Graphics, Inc.
+ * Copyright (c) 2015 Oracle.
+ * All Rights Reserved.
+ *
+ * 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.
+ *
+ * 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
+ */
+#ifndef __XFS_REFCOUNT_H__
+#define __XFS_REFCOUNT_H__
+
+extern int xfs_refcountbt_lookup_le(struct xfs_btree_cur *cur,
+ xfs_agblock_t bno, int *stat);
+extern int xfs_refcountbt_lookup_ge(struct xfs_btree_cur *cur,
+ xfs_agblock_t bno, int *stat);
+extern int xfs_refcountbt_get_rec(struct xfs_btree_cur *cur,
+ struct xfs_refcount_irec *irec, int *stat);
+
+#endif /* __XFS_REFCOUNT_H__ */
diff --git a/fs/xfs/libxfs/xfs_refcount_btree.c b/fs/xfs/libxfs/xfs_refcount_btree.c
index 7067a05..d7574cd 100644
--- a/fs/xfs/libxfs/xfs_refcount_btree.c
+++ b/fs/xfs/libxfs/xfs_refcount_btree.c
@@ -43,6 +43,158 @@ xfs_refcountbt_dup_cursor(
cur->bc_private.a.flist);
}
+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_ROOTS | XFS_AGF_LEVELS);
+}
+
+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_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_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;
+
+ error = xfs_alloc_vextent(&args);
+ if (error)
+ goto out_error;
+ 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);
+
+ 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_trans *tp = cur->bc_tp;
+ xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
+ struct xfs_owner_info oinfo;
+
+ XFS_RMAP_AG_OWNER(&oinfo, XFS_RMAP_OWN_REFC);
+ xfs_bmap_add_free(mp, cur->bc_private.a.flist, fsbno, 1,
+ &oinfo);
+ xfs_trans_binval(tp, bp);
+ return 0;
+}
+
+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)
+{
+ ASSERT(rec->refc.rc_startblock != 0);
+
+ key->refc.rc_startblock = rec->refc.rc_startblock;
+}
+
+STATIC void
+xfs_refcountbt_init_rec_from_key(
+ union xfs_btree_key *key,
+ union xfs_btree_rec *rec)
+{
+ ASSERT(key->refc.rc_startblock != 0);
+
+ rec->refc.rc_startblock = key->refc.rc_startblock;
+}
+
+STATIC void
+xfs_refcountbt_init_rec_from_cur(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_rec *rec)
+{
+ ASSERT(cur->bc_rec.rc.rc_startblock != 0);
+
+ 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 bool
xfs_refcountbt_verify(
struct xfs_buf *bp)
@@ -104,12 +256,63 @@ const struct xfs_buf_ops xfs_refcountbt_buf_ops = {
.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)
+{
+ struct xfs_refcount_irec a, b;
+
+ int ret = be32_to_cpu(r1->refc.rc_startblock) +
+ be32_to_cpu(r1->refc.rc_blockcount) <=
+ be32_to_cpu(r2->refc.rc_startblock);
+ if (!ret) {
+ a.rc_startblock = be32_to_cpu(r1->refc.rc_startblock);
+ a.rc_blockcount = be32_to_cpu(r1->refc.rc_blockcount);
+ a.rc_refcount = be32_to_cpu(r1->refc.rc_refcount);
+ b.rc_startblock = be32_to_cpu(r2->refc.rc_startblock);
+ b.rc_blockcount = be32_to_cpu(r2->refc.rc_blockcount);
+ b.rc_refcount = be32_to_cpu(r2->refc.rc_refcount);
+ trace_xfs_refcount_rec_order_error(cur->bc_mp,
+ cur->bc_private.a.agno, &a, &b);
+ }
+
+ return ret;
+}
+#endif /* DEBUG */
+
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_rec_from_key = xfs_refcountbt_init_rec_from_key,
+ .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,
+#if defined(DEBUG) || defined(XFS_WARN)
+ .keys_inorder = xfs_refcountbt_keys_inorder,
+ .recs_inorder = xfs_refcountbt_recs_inorder,
+#endif
};
/**
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