Start filling out the rtrmap btree implementation. Start with the
on-disk btree format; add everything needed to read, write and
manipulate rmap btree blocks. This prepares the way for connecting the
btree operations implementation.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
include/libxfs.h | 1
include/xfs_mount.h | 3 +
libxfs/Makefile | 2
libxfs/init.c | 2
libxfs/xfs_btree.c | 1
libxfs/xfs_btree.h | 3 +
libxfs/xfs_format.h | 48 +++++++++++
libxfs/xfs_rtrmap_btree.c | 195 +++++++++++++++++++++++++++++++++++++++++++++
libxfs/xfs_rtrmap_btree.h | 62 ++++++++++++++
libxfs/xfs_sb.c | 6 +
libxfs/xfs_shared.h | 1
11 files changed, 324 insertions(+)
create mode 100644 libxfs/xfs_rtrmap_btree.c
create mode 100644 libxfs/xfs_rtrmap_btree.h
diff --git a/include/libxfs.h b/include/libxfs.h
index e5e1523..60a90dc 100644
--- a/include/libxfs.h
+++ b/include/libxfs.h
@@ -78,6 +78,7 @@ extern uint32_t crc32c_le(uint32_t crc, unsigned char const *p, size_t len);
#include "xfs_trace.h"
#include "xfs_trans.h"
#include "xfs_rmap_btree.h"
+#include "xfs_rtrmap_btree.h"
#include "xfs_rmap.h"
#include "xfs_refcount_btree.h"
#include "xfs_refcount.h"
diff --git a/include/xfs_mount.h b/include/xfs_mount.h
index 97b4ad7..fcc0d95 100644
--- a/include/xfs_mount.h
+++ b/include/xfs_mount.h
@@ -66,12 +66,15 @@ typedef struct xfs_mount {
uint m_inobt_mnr[2]; /* XFS_INOBT_BLOCK_MINRECS */
uint m_rmap_mxr[2]; /* max rmap btree records */
uint m_rmap_mnr[2]; /* min rmap btree records */
+ uint m_rtrmap_mxr[2]; /* max rtrmap btree records */
+ uint m_rtrmap_mnr[2]; /* min rtrmap btree records */
uint m_refc_mxr[2]; /* max refc btree records */
uint m_refc_mnr[2]; /* min refc btree records */
uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
uint m_in_maxlevels; /* XFS_IN_MAXLEVELS */
uint m_rmap_maxlevels; /* max rmap btree levels */
+ uint m_rtrmap_maxlevels; /* max rtrmap btree level */
uint m_refc_maxlevels; /* max refcount btree level */
xfs_extlen_t m_ag_prealloc_blocks; /* reserved ag blocks */
uint m_alloc_set_aside; /* space we can't use */
diff --git a/libxfs/Makefile b/libxfs/Makefile
index 6499731..5ccf2e4 100644
--- a/libxfs/Makefile
+++ b/libxfs/Makefile
@@ -40,6 +40,7 @@ HFILES = \
xfs_refcount_btree.h \
xfs_rmap.h \
xfs_rmap_btree.h \
+ xfs_rtrmap_btree.h \
xfs_sb.h \
xfs_shared.h \
xfs_trans_resv.h \
@@ -92,6 +93,7 @@ CFILES = cache.c \
xfs_refcount_btree.c \
xfs_rmap.c \
xfs_rmap_btree.c \
+ xfs_rtrmap_btree.c \
xfs_rtbitmap.c \
xfs_sb.c \
xfs_symlink_remote.c \
diff --git a/libxfs/init.c b/libxfs/init.c
index 9134879..e3f8a5d 100644
--- a/libxfs/init.c
+++ b/libxfs/init.c
@@ -33,6 +33,7 @@
#include "xfs_trans.h"
#include "xfs_rmap_btree.h"
#include "xfs_refcount_btree.h"
+#include "xfs_rtrmap_btree.h"
#include "libxfs.h" /* for now */
@@ -690,6 +691,7 @@ libxfs_mount(
xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK);
xfs_ialloc_compute_maxlevels(mp);
xfs_rmapbt_compute_maxlevels(mp);
+ xfs_rtrmapbt_compute_maxlevels(mp);
xfs_refcountbt_compute_maxlevels(mp);
if (sbp->sb_imax_pct) {
diff --git a/libxfs/xfs_btree.c b/libxfs/xfs_btree.c
index 53f6192..562e42b 100644
--- a/libxfs/xfs_btree.c
+++ b/libxfs/xfs_btree.c
@@ -1216,6 +1216,7 @@ xfs_btree_set_refs(
xfs_buf_set_ref(bp, XFS_BMAP_BTREE_REF);
break;
case XFS_BTNUM_RMAP:
+ case XFS_BTNUM_RTRMAP:
xfs_buf_set_ref(bp, XFS_RMAP_BTREE_REF);
break;
case XFS_BTNUM_REFC:
diff --git a/libxfs/xfs_btree.h b/libxfs/xfs_btree.h
index 8913ffa..a9936ac 100644
--- a/libxfs/xfs_btree.h
+++ b/libxfs/xfs_btree.h
@@ -50,6 +50,8 @@ union xfs_btree_key {
struct xfs_rmap_key rmap;
struct xfs_rmap_key __rmap_bigkey[2];
struct xfs_refcount_key refc;
+ struct xfs_rtrmap_key rtrmap;
+ struct xfs_rtrmap_key __rtrmap_bigkey[2];
};
union xfs_btree_rec {
@@ -59,6 +61,7 @@ union xfs_btree_rec {
struct xfs_inobt_rec inobt;
struct xfs_rmap_rec rmap;
struct xfs_refcount_rec refc;
+ struct xfs_rtrmap_rec rtrmap;
};
/*
diff --git a/libxfs/xfs_format.h b/libxfs/xfs_format.h
index ae2d958..82ff6fc 100644
--- a/libxfs/xfs_format.h
+++ b/libxfs/xfs_format.h
@@ -1470,6 +1470,54 @@ typedef __be32 xfs_rmap_ptr_t;
#define XFS_RTRMAP_CRC_MAGIC 0x4d415052 /* 'MAPR' */
/*
+ * Data record structure
+ */
+struct xfs_rtrmap_rec {
+ __be64 rm_startblock; /* extent start block */
+ __be64 rm_blockcount; /* extent length */
+ __be64 rm_owner; /* extent owner */
+ __be64 rm_offset; /* offset within the owner */
+};
+
+/* rm_offset has the same values as the regular rmapbt. */
+#define XFS_RTRMAP_OFF_ATTR_FORK XFS_RMAP_OFF_ATTR_FORK
+#define XFS_RTRMAP_OFF_BMBT_BLOCK XFS_RMAP_OFF_BMBT_BLOCK
+#define XFS_RTRMAP_OFF_UNWRITTEN XFS_RMAP_OFF_UNWRITTEN
+
+#define XFS_RTRMAP_LEN_MAX ((__uint64_t)~0U)
+#define XFS_RTRMAP_OFF_FLAGS XFS_RMAP_OFF_FLAGS
+#define XFS_RTRMAP_OFF_MASK XFS_RMAP_OFF_MASK
+
+#define XFS_RTRMAP_OFF XFS_RMAP_OFF
+
+#define XFS_RTRMAP_IS_BMBT_BLOCK(off) XFS_RMAP_IS_BMBT_BLOCK
+#define XFS_RTRMAP_IS_ATTR_FORK(off) XFS_RMAP_IS_ATTR_FORK
+#define XFS_RTRMAP_IS_UNWRITTEN(len) XFS_RMAP_IS_UNWRITTEN
+
+#define RTRMAPBT_STARTBLOCK_BITLEN 64
+#define RTRMAPBT_BLOCKCOUNT_BITLEN 64
+#define RTRMAPBT_OWNER_BITLEN RMAPBT_OWNER_BITLEN
+#define RTRMAPBT_ATTRFLAG_BITLEN RMAPBT_ATTRFLAG_BITLEN
+#define RTRMAPBT_BMBTFLAG_BITLEN RMAPBT_BMBTFLAG_BITLEN
+#define RTRMAPBT_EXNTFLAG_BITLEN RMAPBT_EXNTFLAG_BITLEN
+#define RTRMAPBT_UNUSED_OFFSET_BITLEN RMAPBT_UNUSED_OFFSET_BITLEN
+#define RTRMAPBT_OFFSET_BITLEN RMAPBT_OFFSET_BITLEN
+
+/*
+ * Key structure
+ *
+ * We don't use the length for lookups
+ */
+struct xfs_rtrmap_key {
+ __be64 rm_startblock; /* extent start block */
+ __be64 rm_owner; /* extent owner */
+ __be64 rm_offset; /* offset within the owner */
+} __attribute__((packed));
+
+/* btree pointer type */
+typedef __be64 xfs_rtrmap_ptr_t;
+
+/*
* Reference Count Btree format definitions
*
*/
diff --git a/libxfs/xfs_rtrmap_btree.c b/libxfs/xfs_rtrmap_btree.c
new file mode 100644
index 0000000..c62e5c8
--- /dev/null
+++ b/libxfs/xfs_rtrmap_btree.c
@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2016 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
+ *
+ * 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 "libxfs_priv.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_bit.h"
+#include "xfs_sb.h"
+#include "xfs_mount.h"
+#include "xfs_defer.h"
+#include "xfs_inode.h"
+#include "xfs_trans.h"
+#include "xfs_alloc.h"
+#include "xfs_btree.h"
+#include "xfs_rtrmap_btree.h"
+#include "xfs_trace.h"
+#include "xfs_cksum.h"
+#include "xfs_ag_resv.h"
+
+/*
+ * Realtime Reverse map btree.
+ *
+ * This is a per-ag tree used to track the owner(s) of a given extent
+ * in the realtime device. See the comments in xfs_rmap_btree.c for
+ * more information.
+ *
+ * This tree is basically the same as the regular rmap btree except that
+ * it doesn't live in free space, and the startblock and blockcount
+ * fields have been widened to 64 bits.
+ */
+
+static struct xfs_btree_cur *
+xfs_rtrmapbt_dup_cursor(
+ struct xfs_btree_cur *cur)
+{
+ struct xfs_btree_cur *new;
+
+ new = xfs_rtrmapbt_init_cursor(cur->bc_mp, cur->bc_tp,
+ cur->bc_private.b.ip);
+
+ /*
+ * Copy the firstblock, dfops, and flags values,
+ * since init cursor doesn't get them.
+ */
+ new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
+ new->bc_private.b.dfops = cur->bc_private.b.dfops;
+ new->bc_private.b.flags = cur->bc_private.b.flags;
+
+ return new;
+}
+
+static bool
+xfs_rtrmapbt_verify(
+ struct xfs_buf *bp)
+{
+ struct xfs_mount *mp = bp->b_target->bt_mount;
+ struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
+ int level;
+
+ if (block->bb_magic != cpu_to_be32(XFS_RTRMAP_CRC_MAGIC))
+ return false;
+
+ if (!xfs_sb_version_hasrmapbt(&mp->m_sb))
+ return false;
+ if (!xfs_btree_lblock_v5hdr_verify(bp, XFS_RMAP_OWN_UNKNOWN))
+ return false;
+ level = be16_to_cpu(block->bb_level);
+ if (level > mp->m_rtrmap_maxlevels)
+ return false;
+
+ return xfs_btree_lblock_verify(bp, mp->m_rtrmap_mxr[level != 0]);
+}
+
+static void
+xfs_rtrmapbt_read_verify(
+ struct xfs_buf *bp)
+{
+ if (!xfs_btree_lblock_verify_crc(bp))
+ xfs_buf_ioerror(bp, -EFSBADCRC);
+ else if (!xfs_rtrmapbt_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_rtrmapbt_write_verify(
+ struct xfs_buf *bp)
+{
+ if (!xfs_rtrmapbt_verify(bp)) {
+ trace_xfs_btree_corrupt(bp, _RET_IP_);
+ xfs_buf_ioerror(bp, -EFSCORRUPTED);
+ xfs_verifier_error(bp);
+ return;
+ }
+ xfs_btree_lblock_calc_crc(bp);
+
+}
+
+const struct xfs_buf_ops xfs_rtrmapbt_buf_ops = {
+ .name = "xfs_rtrmapbt",
+ .verify_read = xfs_rtrmapbt_read_verify,
+ .verify_write = xfs_rtrmapbt_write_verify,
+};
+
+static const struct xfs_btree_ops xfs_rtrmapbt_ops = {
+ .rec_len = sizeof(struct xfs_rtrmap_rec),
+ .key_len = 2 * sizeof(struct xfs_rtrmap_key),
+
+ .dup_cursor = xfs_rtrmapbt_dup_cursor,
+ .buf_ops = &xfs_rtrmapbt_buf_ops,
+};
+
+/*
+ * Allocate a new allocation btree cursor.
+ */
+struct xfs_btree_cur *
+xfs_rtrmapbt_init_cursor(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct xfs_inode *ip)
+{
+ struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ struct xfs_btree_cur *cur;
+
+ cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS);
+ cur->bc_tp = tp;
+ cur->bc_mp = mp;
+ cur->bc_btnum = XFS_BTNUM_RTRMAP;
+ cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE |
+ XFS_BTREE_CRC_BLOCKS | XFS_BTREE_IROOT_RECORDS |
+ XFS_BTREE_OVERLAPPING;
+ cur->bc_blocklog = mp->m_sb.sb_blocklog;
+ cur->bc_ops = &xfs_rtrmapbt_ops;
+ cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
+
+ cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, XFS_DATA_FORK);
+ cur->bc_private.b.ip = ip;
+ cur->bc_private.b.firstblock = NULLFSBLOCK;
+ cur->bc_private.b.dfops = NULL;
+ cur->bc_private.b.allocated = 0;
+ cur->bc_private.b.flags = 0;
+ cur->bc_private.b.whichfork = XFS_DATA_FORK;
+
+ return cur;
+}
+
+/*
+ * Calculate number of records in an rmap btree block.
+ */
+int
+xfs_rtrmapbt_maxrecs(
+ struct xfs_mount *mp,
+ int blocklen,
+ bool leaf)
+{
+ blocklen -= XFS_RTRMAP_BLOCK_LEN;
+
+ if (leaf)
+ return blocklen / sizeof(struct xfs_rtrmap_rec);
+ return blocklen /
+ (2 * sizeof(struct xfs_rtrmap_key) + sizeof(xfs_rtrmap_ptr_t));
+}
+
+/* Compute the maximum height of an rmap btree. */
+void
+xfs_rtrmapbt_compute_maxlevels(
+ struct xfs_mount *mp)
+{
+ mp->m_rtrmap_maxlevels = xfs_btree_compute_maxlevels(mp,
+ mp->m_rtrmap_mnr, mp->m_sb.sb_rblocks);
+ ASSERT(mp->m_rtrmap_maxlevels <= XFS_BTREE_MAXLEVELS);
+}
diff --git a/libxfs/xfs_rtrmap_btree.h b/libxfs/xfs_rtrmap_btree.h
new file mode 100644
index 0000000..5eb19f4
--- /dev/null
+++ b/libxfs/xfs_rtrmap_btree.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2016 Oracle. All Rights Reserved.
+ *
+ * Author: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
+ *
+ * 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.
+ */
+#ifndef __XFS_RTRMAP_BTREE_H__
+#define __XFS_RTRMAP_BTREE_H__
+
+struct xfs_buf;
+struct xfs_btree_cur;
+struct xfs_mount;
+
+/* rmaps only exist on crc enabled filesystems */
+#define XFS_RTRMAP_BLOCK_LEN XFS_BTREE_LBLOCK_CRC_LEN
+
+/*
+ * Record, key, and pointer address macros for btree blocks.
+ *
+ * (note that some of these may appear unused, but they are used in userspace)
+ */
+#define XFS_RTRMAP_REC_ADDR(block, index) \
+ ((struct xfs_rtrmap_rec *) \
+ ((char *)(block) + XFS_RTRMAP_BLOCK_LEN + \
+ (((index) - 1) * sizeof(struct xfs_rtrmap_rec))))
+
+#define XFS_RTRMAP_KEY_ADDR(block, index) \
+ ((struct xfs_rtrmap_key *) \
+ ((char *)(block) + XFS_RTRMAP_BLOCK_LEN + \
+ ((index) - 1) * 2 * sizeof(struct xfs_rtrmap_key)))
+
+#define XFS_RTRMAP_HIGH_KEY_ADDR(block, index) \
+ ((struct xfs_rtrmap_key *) \
+ ((char *)(block) + XFS_RTRMAP_BLOCK_LEN + \
+ sizeof(struct xfs_rtrmap_key) + \
+ ((index) - 1) * 2 * sizeof(struct xfs_rtrmap_key)))
+
+#define XFS_RTRMAP_PTR_ADDR(block, index, maxrecs) \
+ ((xfs_rtrmap_ptr_t *) \
+ ((char *)(block) + XFS_RTRMAP_BLOCK_LEN + \
+ (maxrecs) * 2 * sizeof(struct xfs_rtrmap_key) + \
+ ((index) - 1) * sizeof(xfs_rtrmap_ptr_t)))
+
+struct xfs_btree_cur *xfs_rtrmapbt_init_cursor(struct xfs_mount *mp,
+ struct xfs_trans *tp, struct xfs_inode *ip);
+int xfs_rtrmapbt_maxrecs(struct xfs_mount *mp, int blocklen, bool leaf);
+extern void xfs_rtrmapbt_compute_maxlevels(struct xfs_mount *mp);
+
+#endif /* __XFS_RTRMAP_BTREE_H__ */
diff --git a/libxfs/xfs_sb.c b/libxfs/xfs_sb.c
index de25489..2e6afe9 100644
--- a/libxfs/xfs_sb.c
+++ b/libxfs/xfs_sb.c
@@ -37,6 +37,7 @@
#include "xfs_rmap_btree.h"
#include "xfs_bmap.h"
#include "xfs_refcount_btree.h"
+#include "xfs_rtrmap_btree.h"
/*
* Physical superblock buffer manipulations. Shared with libxfs in userspace.
@@ -742,6 +743,11 @@ xfs_sb_mount_common(
mp->m_rmap_mnr[0] = mp->m_rmap_mxr[0] / 2;
mp->m_rmap_mnr[1] = mp->m_rmap_mxr[1] / 2;
+ mp->m_rtrmap_mxr[0] = xfs_rtrmapbt_maxrecs(mp, sbp->sb_blocksize, 1);
+ mp->m_rtrmap_mxr[1] = xfs_rtrmapbt_maxrecs(mp, sbp->sb_blocksize, 0);
+ mp->m_rtrmap_mnr[0] = mp->m_rtrmap_mxr[0] / 2;
+ mp->m_rtrmap_mnr[1] = mp->m_rtrmap_mxr[1] / 2;
+
mp->m_refc_mxr[0] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize,
true);
mp->m_refc_mxr[1] = xfs_refcountbt_maxrecs(mp, sbp->sb_blocksize,
diff --git a/libxfs/xfs_shared.h b/libxfs/xfs_shared.h
index c6f4eb4..0032a8c 100644
--- a/libxfs/xfs_shared.h
+++ b/libxfs/xfs_shared.h
@@ -39,6 +39,7 @@ extern const struct xfs_buf_ops xfs_agf_buf_ops;
extern const struct xfs_buf_ops xfs_agfl_buf_ops;
extern const struct xfs_buf_ops xfs_allocbt_buf_ops;
extern const struct xfs_buf_ops xfs_rmapbt_buf_ops;
+extern const struct xfs_buf_ops xfs_rtrmapbt_buf_ops;
extern const struct xfs_buf_ops xfs_refcountbt_buf_ops;
extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops;
extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops;
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