From: Darrick J. Wong <djwong@xxxxxxxxxx>
Adapt the generic btree cursor code to be able to create a btree whose
buffers come from a (presumably in-memory) buftarg with a header block
that's specific to in-memory btrees. We'll connect this to other parts
of online scrub in the next patches.
Note that in-memory btrees always have a block size matching the system
memory page size for efficiency reasons. There are also a few things we
need to do to finalize a btree update; that's covered in the next patch.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
.../filesystems/xfs/xfs-online-fsck-design.rst | 5
fs/xfs/Kconfig | 4
fs/xfs/Makefile | 1
fs/xfs/libxfs/xfs_btree.c | 256 +++++++++++++++++---
fs/xfs/libxfs/xfs_btree.h | 7 +
fs/xfs/libxfs/xfs_btree_mem.c | 228 ++++++++++++++++++
fs/xfs/libxfs/xfs_btree_mem.h | 72 ++++++
fs/xfs/scrub/scrub.c | 5
fs/xfs/scrub/scrub.h | 3
fs/xfs/xfs_buf_mem.c | 13 +
fs/xfs/xfs_buf_mem.h | 2
fs/xfs/xfs_health.c | 3
fs/xfs/xfs_trace.c | 1
fs/xfs/xfs_trace.h | 117 +++++++++
14 files changed, 675 insertions(+), 42 deletions(-)
create mode 100644 fs/xfs/libxfs/xfs_btree_mem.c
create mode 100644 fs/xfs/libxfs/xfs_btree_mem.h
diff --git a/Documentation/filesystems/xfs/xfs-online-fsck-design.rst b/Documentation/filesystems/xfs/xfs-online-fsck-design.rst
index d03480266e9b1..6333697ba3e82 100644
--- a/Documentation/filesystems/xfs/xfs-online-fsck-design.rst
+++ b/Documentation/filesystems/xfs/xfs-online-fsck-design.rst
@@ -2270,13 +2270,12 @@ follows:
pointing to the xfile.
3. Pass the buffer cache target, buffer ops, and other information to
- ``xfbtree_create`` to write an initial tree header and root block to the
- xfile.
+ ``xfbtree_init`` to initialize the passed in ``struct xfbtree`` and write an
+ initial root block to the xfile.
Each btree type should define a wrapper that passes necessary arguments to
the creation function.
For example, rmap btrees define ``xfs_rmapbt_mem_create`` to take care of
all the necessary details for callers.
- A ``struct xfbtree`` object will be returned.
4. Pass the xfbtree object to the btree cursor creation function for the
btree type.
diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig
index 7017ea0fb4cd3..d41edd30388b7 100644
--- a/fs/xfs/Kconfig
+++ b/fs/xfs/Kconfig
@@ -131,6 +131,9 @@ config XFS_LIVE_HOOKS
config XFS_MEMORY_BUFS
bool
+config XFS_BTREE_IN_MEM
+ bool
+
config XFS_ONLINE_SCRUB
bool "XFS online metadata check support"
default n
@@ -173,6 +176,7 @@ config XFS_ONLINE_REPAIR
bool "XFS online metadata repair support"
default n
depends on XFS_FS && XFS_ONLINE_SCRUB
+ select XFS_BTREE_IN_MEM
help
If you say Y here you will be able to repair metadata on a
mounted XFS filesystem. This feature is intended to reduce
diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index 78d816ffd99a3..caa50b5b5468e 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -139,6 +139,7 @@ endif
xfs-$(CONFIG_XFS_DRAIN_INTENTS) += xfs_drain.o
xfs-$(CONFIG_XFS_LIVE_HOOKS) += xfs_hooks.o
xfs-$(CONFIG_XFS_MEMORY_BUFS) += xfs_buf_mem.o
+xfs-$(CONFIG_XFS_BTREE_IN_MEM) += libxfs/xfs_btree_mem.o
# online scrub/repair
ifeq ($(CONFIG_XFS_ONLINE_SCRUB),y)
diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c
index aa60a46b8eecc..d29547572a688 100644
--- a/fs/xfs/libxfs/xfs_btree.c
+++ b/fs/xfs/libxfs/xfs_btree.c
@@ -28,6 +28,8 @@
#include "xfs_rmap_btree.h"
#include "xfs_refcount_btree.h"
#include "xfs_health.h"
+#include "xfs_buf_mem.h"
+#include "xfs_btree_mem.h"
/*
* Btree magic numbers.
@@ -75,6 +77,25 @@ xfs_btree_check_fsblock_siblings(
return NULL;
}
+static inline xfs_failaddr_t
+xfs_btree_check_memblock_siblings(
+ struct xfs_buftarg *btp,
+ xfbno_t bno,
+ __be64 dsibling)
+{
+ xfbno_t sibling;
+
+ if (dsibling == cpu_to_be64(NULLFSBLOCK))
+ return NULL;
+
+ sibling = be64_to_cpu(dsibling);
+ if (sibling == bno)
+ return __this_address;
+ if (!xmbuf_verify_daddr(btp, xfbno_to_daddr(sibling)))
+ return __this_address;
+ return NULL;
+}
+
static inline xfs_failaddr_t
xfs_btree_check_agblock_siblings(
struct xfs_perag *pag,
@@ -164,6 +185,34 @@ __xfs_btree_check_fsblock(
return fa;
}
+/*
+ * Check an in-memory btree block header. Return the address of the failing
+ * check, or NULL if everything is ok.
+ */
+static xfs_failaddr_t
+__xfs_btree_check_memblock(
+ struct xfs_btree_cur *cur,
+ struct xfs_btree_block *block,
+ int level,
+ struct xfs_buf *bp)
+{
+ struct xfs_buftarg *btp = cur->bc_mem.xfbtree->target;
+ xfs_failaddr_t fa;
+ xfbno_t bno;
+
+ fa = __xfs_btree_check_lblock_hdr(cur, block, level, bp);
+ if (fa)
+ return fa;
+
+ bno = xfs_daddr_to_xfbno(xfs_buf_daddr(bp));
+ fa = xfs_btree_check_memblock_siblings(btp, bno,
+ block->bb_u.l.bb_leftsib);
+ if (!fa)
+ fa = xfs_btree_check_memblock_siblings(btp, bno,
+ block->bb_u.l.bb_rightsib);
+ return fa;
+}
+
/*
* Check a short btree block header. Return the address of the failing check,
* or NULL if everything is ok.
@@ -216,9 +265,17 @@ __xfs_btree_check_block(
int level,
struct xfs_buf *bp)
{
- if (cur->bc_ops->type == XFS_BTREE_TYPE_AG)
+ switch (cur->bc_ops->type) {
+ case XFS_BTREE_TYPE_MEM:
+ return __xfs_btree_check_memblock(cur, block, level, bp);
+ case XFS_BTREE_TYPE_AG:
return __xfs_btree_check_agblock(cur, block, level, bp);
- return __xfs_btree_check_fsblock(cur, block, level, bp);
+ case XFS_BTREE_TYPE_INODE:
+ return __xfs_btree_check_fsblock(cur, block, level, bp);
+ default:
+ ASSERT(0);
+ return __this_address;
+ }
}
static inline unsigned int xfs_btree_block_errtag(struct xfs_btree_cur *cur)
@@ -262,14 +319,22 @@ __xfs_btree_check_ptr(
if (level <= 0)
return -EFSCORRUPTED;
- if (cur->bc_ops->type == XFS_BTREE_TYPE_INODE) {
+ switch (cur->bc_ops->type) {
+ case XFS_BTREE_TYPE_MEM:
+ if (!xfbtree_verify_bno(cur->bc_mem.xfbtree,
+ be64_to_cpu((&ptr->l)[index])))
+ return -EFSCORRUPTED;
+ break;
+ case XFS_BTREE_TYPE_INODE:
if (!xfs_verify_fsbno(cur->bc_mp,
be64_to_cpu((&ptr->l)[index])))
return -EFSCORRUPTED;
- } else {
+ break;
+ case XFS_BTREE_TYPE_AG:
if (!xfs_verify_agbno(cur->bc_ag.pag,
be32_to_cpu((&ptr->s)[index])))
return -EFSCORRUPTED;
+ break;
}
return 0;
@@ -290,17 +355,26 @@ xfs_btree_check_ptr(
error = __xfs_btree_check_ptr(cur, ptr, index, level);
if (error) {
- if (cur->bc_ops->type == XFS_BTREE_TYPE_INODE) {
+ switch (cur->bc_ops->type) {
+ case XFS_BTREE_TYPE_MEM:
+ xfs_err(cur->bc_mp,
+"In-memory: Corrupt %sbt flags 0x%x pointer at level %d index %d fa %pS.",
+ cur->bc_ops->name, cur->bc_flags, level, index,
+ __this_address);
+ break;
+ case XFS_BTREE_TYPE_INODE:
xfs_err(cur->bc_mp,
"Inode %llu fork %d: Corrupt %sbt pointer at level %d index %d.",
cur->bc_ino.ip->i_ino,
cur->bc_ino.whichfork, cur->bc_ops->name,
level, index);
- } else {
+ break;
+ case XFS_BTREE_TYPE_AG:
xfs_err(cur->bc_mp,
"AG %u: Corrupt %sbt pointer at level %d index %d.",
cur->bc_ag.pag->pag_agno, cur->bc_ops->name,
level, index);
+ break;
}
xfs_btree_mark_sick(cur);
}
@@ -457,11 +531,35 @@ xfs_btree_del_cursor(
case XFS_BTREE_TYPE_INODE:
/* nothing to do */
break;
+ case XFS_BTREE_TYPE_MEM:
+ if (cur->bc_mem.pag)
+ xfs_perag_put(cur->bc_mem.pag);
+ break;
}
kmem_cache_free(cur->bc_cache, cur);
}
+/* Return the buffer target for this btree's buffer. */
+static inline struct xfs_buftarg *
+xfs_btree_buftarg(
+ struct xfs_btree_cur *cur)
+{
+ if (cur->bc_ops->type == XFS_BTREE_TYPE_MEM)
+ return cur->bc_mem.xfbtree->target;
+ return cur->bc_mp->m_ddev_targp;
+}
+
+/* Return the block size (in units of 512b sectors) for this btree. */
+static inline unsigned int
+xfs_btree_bbsize(
+ struct xfs_btree_cur *cur)
+{
+ if (cur->bc_ops->type == XFS_BTREE_TYPE_MEM)
+ return XFBNO_BBSIZE;
+ return cur->bc_mp->m_bsize;
+}
+
/*
* Duplicate the btree cursor.
* Allocate a new one, copy the record, re-get the buffers.
@@ -505,10 +603,11 @@ xfs_btree_dup_cursor(
new->bc_levels[i].ra = cur->bc_levels[i].ra;
bp = cur->bc_levels[i].bp;
if (bp) {
- error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
- xfs_buf_daddr(bp), mp->m_bsize,
- 0, &bp,
- cur->bc_ops->buf_ops);
+ error = xfs_trans_read_buf(mp, tp,
+ xfs_btree_buftarg(cur),
+ xfs_buf_daddr(bp),
+ xfs_btree_bbsize(cur), 0, &bp,
+ cur->bc_ops->buf_ops);
if (xfs_metadata_is_sick(error))
xfs_btree_mark_sick(new);
if (error) {
@@ -885,6 +984,32 @@ xfs_btree_readahead_fsblock(
return rval;
}
+STATIC int
+xfs_btree_readahead_memblock(
+ struct xfs_btree_cur *cur,
+ int lr,
+ struct xfs_btree_block *block)
+{
+ struct xfs_buftarg *btp = cur->bc_mem.xfbtree->target;
+ xfbno_t left = be64_to_cpu(block->bb_u.l.bb_leftsib);
+ xfbno_t right = be64_to_cpu(block->bb_u.l.bb_rightsib);
+ int rval = 0;
+
+ if ((lr & XFS_BTCUR_LEFTRA) && left != NULLFSBLOCK) {
+ xfs_buf_readahead(btp, xfbno_to_daddr(left), XFBNO_BBSIZE,
+ cur->bc_ops->buf_ops);
+ rval++;
+ }
+
+ if ((lr & XFS_BTCUR_RIGHTRA) && right != NULLFSBLOCK) {
+ xfs_buf_readahead(btp, xfbno_to_daddr(right), XFBNO_BBSIZE,
+ cur->bc_ops->buf_ops);
+ rval++;
+ }
+
+ return rval;
+}
+
STATIC int
xfs_btree_readahead_agblock(
struct xfs_btree_cur *cur,
@@ -939,9 +1064,17 @@ xfs_btree_readahead(
cur->bc_levels[lev].ra |= lr;
block = XFS_BUF_TO_BLOCK(cur->bc_levels[lev].bp);
- if (cur->bc_ops->ptr_len == XFS_BTREE_LONG_PTR_LEN)
+ switch (cur->bc_ops->type) {
+ case XFS_BTREE_TYPE_AG:
+ return xfs_btree_readahead_agblock(cur, lr, block);
+ case XFS_BTREE_TYPE_INODE:
return xfs_btree_readahead_fsblock(cur, lr, block);
- return xfs_btree_readahead_agblock(cur, lr, block);
+ case XFS_BTREE_TYPE_MEM:
+ return xfs_btree_readahead_memblock(cur, lr, block);
+ default:
+ ASSERT(0);
+ return 0;
+ }
}
STATIC int
@@ -950,23 +1083,24 @@ xfs_btree_ptr_to_daddr(
const union xfs_btree_ptr *ptr,
xfs_daddr_t *daddr)
{
- xfs_fsblock_t fsbno;
- xfs_agblock_t agbno;
int error;
error = xfs_btree_check_ptr(cur, ptr, 0, 1);
if (error)
return error;
- if (cur->bc_ops->ptr_len == XFS_BTREE_LONG_PTR_LEN) {
- fsbno = be64_to_cpu(ptr->l);
- *daddr = XFS_FSB_TO_DADDR(cur->bc_mp, fsbno);
- } else {
- agbno = be32_to_cpu(ptr->s);
+ switch (cur->bc_ops->type) {
+ case XFS_BTREE_TYPE_AG:
*daddr = XFS_AGB_TO_DADDR(cur->bc_mp, cur->bc_ag.pag->pag_agno,
- agbno);
+ be32_to_cpu(ptr->s));
+ break;
+ case XFS_BTREE_TYPE_INODE:
+ *daddr = XFS_FSB_TO_DADDR(cur->bc_mp, be64_to_cpu(ptr->l));
+ break;
+ case XFS_BTREE_TYPE_MEM:
+ *daddr = xfbno_to_daddr(be64_to_cpu(ptr->l));
+ break;
}
-
return 0;
}
@@ -986,8 +1120,9 @@ xfs_btree_readahead_ptr(
if (xfs_btree_ptr_to_daddr(cur, ptr, &daddr))
return;
- xfs_buf_readahead(cur->bc_mp->m_ddev_targp, daddr,
- cur->bc_mp->m_bsize * count, cur->bc_ops->buf_ops);
+ xfs_buf_readahead(xfs_btree_buftarg(cur), daddr,
+ xfs_btree_bbsize(cur) * count,
+ cur->bc_ops->buf_ops);
}
/*
@@ -1172,9 +1307,17 @@ static inline __u64
xfs_btree_owner(
struct xfs_btree_cur *cur)
{
- if (cur->bc_ops->type == XFS_BTREE_TYPE_INODE)
+ switch (cur->bc_ops->type) {
+ case XFS_BTREE_TYPE_MEM:
+ return cur->bc_mem.xfbtree->owner;
+ case XFS_BTREE_TYPE_INODE:
return cur->bc_ino.ip->i_ino;
- return cur->bc_ag.pag->pag_agno;
+ case XFS_BTREE_TYPE_AG:
+ return cur->bc_ag.pag->pag_agno;
+ default:
+ ASSERT(0);
+ return 0;
+ }
}
void
@@ -1218,12 +1361,18 @@ xfs_btree_buf_to_ptr(
struct xfs_buf *bp,
union xfs_btree_ptr *ptr)
{
- if (cur->bc_ops->ptr_len == XFS_BTREE_LONG_PTR_LEN)
- ptr->l = cpu_to_be64(XFS_DADDR_TO_FSB(cur->bc_mp,
- xfs_buf_daddr(bp)));
- else {
+ switch (cur->bc_ops->type) {
+ case XFS_BTREE_TYPE_AG:
ptr->s = cpu_to_be32(xfs_daddr_to_agbno(cur->bc_mp,
xfs_buf_daddr(bp)));
+ break;
+ case XFS_BTREE_TYPE_INODE:
+ ptr->l = cpu_to_be64(XFS_DADDR_TO_FSB(cur->bc_mp,
+ xfs_buf_daddr(bp)));
+ break;
+ case XFS_BTREE_TYPE_MEM:
+ ptr->l = cpu_to_be64(xfs_daddr_to_xfbno(xfs_buf_daddr(bp)));
+ break;
}
}
@@ -1242,15 +1391,14 @@ xfs_btree_get_buf_block(
struct xfs_btree_block **block,
struct xfs_buf **bpp)
{
- struct xfs_mount *mp = cur->bc_mp;
- xfs_daddr_t d;
- int error;
+ xfs_daddr_t d;
+ int error;
error = xfs_btree_ptr_to_daddr(cur, ptr, &d);
if (error)
return error;
- error = xfs_trans_get_buf(cur->bc_tp, mp->m_ddev_targp, d, mp->m_bsize,
- 0, bpp);
+ error = xfs_trans_get_buf(cur->bc_tp, xfs_btree_buftarg(cur), d,
+ xfs_btree_bbsize(cur), 0, bpp);
if (error)
return error;
@@ -1281,9 +1429,9 @@ xfs_btree_read_buf_block(
error = xfs_btree_ptr_to_daddr(cur, ptr, &d);
if (error)
return error;
- error = xfs_trans_read_buf(mp, cur->bc_tp, mp->m_ddev_targp, d,
- mp->m_bsize, flags, bpp,
- cur->bc_ops->buf_ops);
+ error = xfs_trans_read_buf(mp, cur->bc_tp, xfs_btree_buftarg(cur), d,
+ xfs_btree_bbsize(cur), flags, bpp,
+ cur->bc_ops->buf_ops);
if (xfs_metadata_is_sick(error))
xfs_btree_mark_sick(cur);
if (error)
@@ -4582,6 +4730,8 @@ xfs_btree_fsblock_verify(
xfs_fsblock_t fsb;
xfs_failaddr_t fa;
+ ASSERT(!xfs_buftarg_is_mem(bp->b_target));
+
/* numrecs verification */
if (be16_to_cpu(block->bb_numrecs) > max_recs)
return __this_address;
@@ -4596,6 +4746,36 @@ xfs_btree_fsblock_verify(
return fa;
}
+/* Verify an in-memory btree block. */
+xfs_failaddr_t
+xfs_btree_memblock_verify(
+ struct xfs_buf *bp,
+ unsigned int max_recs)
+{
+ struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
+ struct xfs_buftarg *btp = bp->b_target;
+ xfs_failaddr_t fa;
+ xfbno_t bno;
+
+ ASSERT(xfs_buftarg_is_mem(bp->b_target));
+
+ /* numrecs verification */
+ if (be16_to_cpu(block->bb_numrecs) > max_recs)
+ return __this_address;
+
+ /* sibling pointer verification */
+ bno = xfs_daddr_to_xfbno(xfs_buf_daddr(bp));
+ fa = xfs_btree_check_memblock_siblings(btp, bno,
+ block->bb_u.l.bb_leftsib);
+ if (fa)
+ return fa;
+ fa = xfs_btree_check_memblock_siblings(btp, bno,
+ block->bb_u.l.bb_rightsib);
+ if (fa)
+ return fa;
+
+ return NULL;
+}
/**
* xfs_btree_agblock_v5hdr_verify() -- verify the v5 fields of a short-format
* btree block
@@ -4637,6 +4817,8 @@ xfs_btree_agblock_verify(
xfs_agblock_t agbno;
xfs_failaddr_t fa;
+ ASSERT(!xfs_buftarg_is_mem(bp->b_target));
+
/* numrecs verification */
if (be16_to_cpu(block->bb_numrecs) > max_recs)
return __this_address;
diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h
index 790eccb771866..dd77b231c1d59 100644
--- a/fs/xfs/libxfs/xfs_btree.h
+++ b/fs/xfs/libxfs/xfs_btree.h
@@ -112,6 +112,7 @@ static inline enum xbtree_key_contig xbtree_key_contig(uint64_t x, uint64_t y)
enum xfs_btree_type {
XFS_BTREE_TYPE_AG,
XFS_BTREE_TYPE_INODE,
+ XFS_BTREE_TYPE_MEM,
};
struct xfs_btree_ops {
@@ -281,6 +282,10 @@ struct xfs_btree_cur
struct xfs_buf *agbp;
struct xbtree_afakeroot *afake; /* for staging cursor */
} bc_ag;
+ struct {
+ struct xfbtree *xfbtree;
+ struct xfs_perag *pag;
+ } bc_mem;
};
/* per-format private data */
@@ -455,6 +460,8 @@ xfs_failaddr_t xfs_btree_fsblock_v5hdr_verify(struct xfs_buf *bp,
uint64_t owner);
xfs_failaddr_t xfs_btree_fsblock_verify(struct xfs_buf *bp,
unsigned int max_recs);
+xfs_failaddr_t xfs_btree_memblock_verify(struct xfs_buf *bp,
+ unsigned int max_recs);
unsigned int xfs_btree_compute_maxlevels(const unsigned int *limits,
unsigned long long records);
diff --git a/fs/xfs/libxfs/xfs_btree_mem.c b/fs/xfs/libxfs/xfs_btree_mem.c
new file mode 100644
index 0000000000000..cb156e9363a5d
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_btree_mem.c
@@ -0,0 +1,228 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2021-2024 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@xxxxxxxxxx>
+ */
+#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_trans.h"
+#include "xfs_btree.h"
+#include "xfs_error.h"
+#include "xfs_buf_mem.h"
+#include "xfs_btree_mem.h"
+#include "xfs_ag.h"
+#include "xfs_buf_item.h"
+#include "xfs_trace.h"
+
+/* Set the root of an in-memory btree. */
+void
+xfbtree_set_root(
+ struct xfs_btree_cur *cur,
+ const union xfs_btree_ptr *ptr,
+ int inc)
+{
+ ASSERT(cur->bc_ops->type == XFS_BTREE_TYPE_MEM);
+
+ cur->bc_mem.xfbtree->root = *ptr;
+ cur->bc_mem.xfbtree->nlevels += inc;
+}
+
+/* Initialize a pointer from the in-memory btree header. */
+void
+xfbtree_init_ptr_from_cur(
+ struct xfs_btree_cur *cur,
+ union xfs_btree_ptr *ptr)
+{
+ ASSERT(cur->bc_ops->type == XFS_BTREE_TYPE_MEM);
+
+ *ptr = cur->bc_mem.xfbtree->root;
+}
+
+/* Duplicate an in-memory btree cursor. */
+struct xfs_btree_cur *
+xfbtree_dup_cursor(
+ struct xfs_btree_cur *cur)
+{
+ struct xfs_btree_cur *ncur;
+
+ ASSERT(cur->bc_ops->type == XFS_BTREE_TYPE_MEM);
+
+ ncur = xfs_btree_alloc_cursor(cur->bc_mp, cur->bc_tp, cur->bc_ops,
+ cur->bc_maxlevels, cur->bc_cache);
+ ncur->bc_flags = cur->bc_flags;
+ ncur->bc_nlevels = cur->bc_nlevels;
+ ncur->bc_mem.xfbtree = cur->bc_mem.xfbtree;
+
+ if (cur->bc_mem.pag)
+ ncur->bc_mem.pag = xfs_perag_hold(cur->bc_mem.pag);
+
+ return ncur;
+}
+
+/* Close the btree xfile and release all resources. */
+void
+xfbtree_destroy(
+ struct xfbtree *xfbt)
+{
+ xfs_buftarg_drain(xfbt->target);
+}
+
+/* Compute the number of bytes available for records. */
+static inline unsigned int
+xfbtree_rec_bytes(
+ struct xfs_mount *mp,
+ const struct xfs_btree_ops *ops)
+{
+ return XMBUF_BLOCKSIZE - XFS_BTREE_LBLOCK_CRC_LEN;
+}
+
+/* Initialize an empty leaf block as the btree root. */
+STATIC int
+xfbtree_init_leaf_block(
+ struct xfs_mount *mp,
+ struct xfbtree *xfbt,
+ const struct xfs_btree_ops *ops)
+{
+ struct xfs_buf *bp;
+ xfbno_t bno = xfbt->highest_bno++;
+ int error;
+
+ error = xfs_buf_get(xfbt->target, xfbno_to_daddr(bno), XFBNO_BBSIZE,
+ &bp);
+ if (error)
+ return error;
+
+ trace_xfbtree_create_root_buf(xfbt, bp);
+
+ bp->b_ops = ops->buf_ops;
+ xfs_btree_init_buf(mp, bp, ops, 0, 0, xfbt->owner);
+ xfs_buf_relse(bp);
+
+ xfbt->root.l = cpu_to_be64(bno);
+ return 0;
+}
+
+/*
+ * Create an in-memory btree root that can be used with the given xmbuf.
+ * Callers must set xfbt->owner.
+ */
+int
+xfbtree_init(
+ struct xfs_mount *mp,
+ struct xfbtree *xfbt,
+ struct xfs_buftarg *btp,
+ const struct xfs_btree_ops *ops)
+{
+ unsigned int blocklen = xfbtree_rec_bytes(mp, ops);
+ unsigned int keyptr_len;
+ int error;
+
+ /* Requires a long-format CRC-format btree */
+ if (!xfs_has_crc(mp)) {
+ ASSERT(xfs_has_crc(mp));
+ return -EINVAL;
+ }
+ if (ops->ptr_len != XFS_BTREE_LONG_PTR_LEN) {
+ ASSERT(ops->ptr_len == XFS_BTREE_LONG_PTR_LEN);
+ return -EINVAL;
+ }
+
+ memset(xfbt, 0, sizeof(*xfbt));
+ xfbt->target = btp;
+
+ /* Set up min/maxrecs for this btree. */
+ keyptr_len = ops->key_len + sizeof(__be64);
+ xfbt->maxrecs[0] = blocklen / ops->rec_len;
+ xfbt->maxrecs[1] = blocklen / keyptr_len;
+ xfbt->minrecs[0] = xfbt->maxrecs[0] / 2;
+ xfbt->minrecs[1] = xfbt->maxrecs[1] / 2;
+ xfbt->highest_bno = 0;
+ xfbt->nlevels = 1;
+
+ /* Initialize the empty btree. */
+ error = xfbtree_init_leaf_block(mp, xfbt, ops);
+ if (error)
+ goto err_freesp;
+
+ trace_xfbtree_init(mp, xfbt, ops);
+
+ return 0;
+
+err_freesp:
+ xfs_buftarg_drain(xfbt->target);
+ return error;
+}
+
+/* Allocate a block to our in-memory btree. */
+int
+xfbtree_alloc_block(
+ struct xfs_btree_cur *cur,
+ const union xfs_btree_ptr *start,
+ union xfs_btree_ptr *new,
+ int *stat)
+{
+ struct xfbtree *xfbt = cur->bc_mem.xfbtree;
+ xfbno_t bno = xfbt->highest_bno++;
+
+ ASSERT(cur->bc_ops->type == XFS_BTREE_TYPE_MEM);
+
+ trace_xfbtree_alloc_block(xfbt, cur, bno);
+
+ /* Fail if the block address exceeds the maximum for the buftarg. */
+ if (!xfbtree_verify_bno(xfbt, bno)) {
+ ASSERT(xfbtree_verify_bno(xfbt, bno));
+ *stat = 0;
+ return 0;
+ }
+
+ new->l = cpu_to_be64(bno);
+ *stat = 1;
+ return 0;
+}
+
+/* Free a block from our in-memory btree. */
+int
+xfbtree_free_block(
+ struct xfs_btree_cur *cur,
+ struct xfs_buf *bp)
+{
+ struct xfbtree *xfbt = cur->bc_mem.xfbtree;
+ xfs_daddr_t daddr = xfs_buf_daddr(bp);
+ xfbno_t bno = xfs_daddr_to_xfbno(daddr);
+
+ ASSERT(cur->bc_ops->type == XFS_BTREE_TYPE_MEM);
+
+ trace_xfbtree_free_block(xfbt, cur, bno);
+
+ if (bno + 1 == xfbt->highest_bno)
+ xfbt->highest_bno--;
+
+ return 0;
+}
+
+/* Return the minimum number of records for a btree block. */
+int
+xfbtree_get_minrecs(
+ struct xfs_btree_cur *cur,
+ int level)
+{
+ struct xfbtree *xfbt = cur->bc_mem.xfbtree;
+
+ return xfbt->minrecs[level != 0];
+}
+
+/* Return the maximum number of records for a btree block. */
+int
+xfbtree_get_maxrecs(
+ struct xfs_btree_cur *cur,
+ int level)
+{
+ struct xfbtree *xfbt = cur->bc_mem.xfbtree;
+
+ return xfbt->maxrecs[level != 0];
+}
diff --git a/fs/xfs/libxfs/xfs_btree_mem.h b/fs/xfs/libxfs/xfs_btree_mem.h
new file mode 100644
index 0000000000000..ecc2ceac3ed4f
--- /dev/null
+++ b/fs/xfs/libxfs/xfs_btree_mem.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2021-2024 Oracle. All Rights Reserved.
+ * Author: Darrick J. Wong <djwong@xxxxxxxxxx>
+ */
+#ifndef __XFS_BTREE_MEM_H__
+#define __XFS_BTREE_MEM_H__
+
+typedef uint64_t xfbno_t;
+
+#define XFBNO_BLOCKSIZE (XMBUF_BLOCKSIZE)
+#define XFBNO_BBSHIFT (XMBUF_BLOCKSHIFT - BBSHIFT)
+#define XFBNO_BBSIZE (XFBNO_BLOCKSIZE >> BBSHIFT)
+
+static inline xfs_daddr_t xfbno_to_daddr(xfbno_t blkno)
+{
+ return blkno << XFBNO_BBSHIFT;
+}
+
+static inline xfbno_t xfs_daddr_to_xfbno(xfs_daddr_t daddr)
+{
+ return daddr >> XFBNO_BBSHIFT;
+}
+
+struct xfbtree {
+ /* buffer cache target for this in-memory btree */
+ struct xfs_buftarg *target;
+
+ /* Highest block number that has been written to. */
+ xfbno_t highest_bno;
+
+ /* Owner of this btree. */
+ unsigned long long owner;
+
+ /* Btree header */
+ union xfs_btree_ptr root;
+ unsigned int nlevels;
+
+ /* Minimum and maximum records per block. */
+ unsigned int maxrecs[2];
+ unsigned int minrecs[2];
+};
+
+#ifdef CONFIG_XFS_BTREE_IN_MEM
+static inline bool xfbtree_verify_bno(struct xfbtree *xfbt, xfbno_t bno)
+{
+ return xmbuf_verify_daddr(xfbt->target, xfbno_to_daddr(bno));
+}
+
+void xfbtree_set_root(struct xfs_btree_cur *cur,
+ const union xfs_btree_ptr *ptr, int inc);
+void xfbtree_init_ptr_from_cur(struct xfs_btree_cur *cur,
+ union xfs_btree_ptr *ptr);
+struct xfs_btree_cur *xfbtree_dup_cursor(struct xfs_btree_cur *cur);
+
+int xfbtree_get_minrecs(struct xfs_btree_cur *cur, int level);
+int xfbtree_get_maxrecs(struct xfs_btree_cur *cur, int level);
+
+int xfbtree_alloc_block(struct xfs_btree_cur *cur,
+ const union xfs_btree_ptr *start, union xfs_btree_ptr *ptr,
+ int *stat);
+int xfbtree_free_block(struct xfs_btree_cur *cur, struct xfs_buf *bp);
+
+/* Callers must set xfbt->target and xfbt->owner before calling this */
+int xfbtree_init(struct xfs_mount *mp, struct xfbtree *xfbt,
+ struct xfs_buftarg *btp, const struct xfs_btree_ops *ops);
+void xfbtree_destroy(struct xfbtree *xfbt);
+#else
+# define xfbtree_verify_bno(...) (false)
+#endif /* CONFIG_XFS_BTREE_IN_MEM */
+
+#endif /* __XFS_BTREE_MEM_H__ */
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c
index aeac9cae4ad4c..6828e72824fb5 100644
--- a/fs/xfs/scrub/scrub.c
+++ b/fs/xfs/scrub/scrub.c
@@ -15,6 +15,7 @@
#include "xfs_quota.h"
#include "xfs_qm.h"
#include "xfs_scrub.h"
+#include "xfs_buf_mem.h"
#include "scrub/scrub.h"
#include "scrub/common.h"
#include "scrub/trace.h"
@@ -190,6 +191,10 @@ xchk_teardown(
sc->flags &= ~XCHK_HAVE_FREEZE_PROT;
mnt_drop_write_file(sc->file);
}
+ if (sc->xmbtp) {
+ xmbuf_free(sc->xmbtp);
+ sc->xmbtp = NULL;
+ }
if (sc->xfile) {
xfile_destroy(sc->xfile);
sc->xfile = NULL;
diff --git a/fs/xfs/scrub/scrub.h b/fs/xfs/scrub/scrub.h
index f99a3c21d02ea..1247284c17a09 100644
--- a/fs/xfs/scrub/scrub.h
+++ b/fs/xfs/scrub/scrub.h
@@ -99,6 +99,9 @@ struct xfs_scrub {
/* xfile used by the scrubbers; freed at teardown. */
struct xfile *xfile;
+ /* buffer target for in-memory btrees; also freed at teardown. */
+ struct xfs_buftarg *xmbtp;
+
/* Lock flags for @ip. */
uint ilock_flags;
diff --git a/fs/xfs/xfs_buf_mem.c b/fs/xfs/xfs_buf_mem.c
index be71ba1a3d7b0..73caa2ea8b18f 100644
--- a/fs/xfs/xfs_buf_mem.c
+++ b/fs/xfs/xfs_buf_mem.c
@@ -187,3 +187,16 @@ xmbuf_unmap_page(
bp->b_pages = NULL;
bp->b_page_count = 0;
}
+
+/* Is this a valid daddr within the buftarg? */
+bool
+xmbuf_verify_daddr(
+ struct xfs_buftarg *btp,
+ xfs_daddr_t daddr)
+{
+ struct inode *inode = file_inode(btp->bt_file);
+
+ ASSERT(xfs_buftarg_is_mem(btp));
+
+ return daddr < (inode->i_sb->s_maxbytes >> BBSHIFT);
+}
diff --git a/fs/xfs/xfs_buf_mem.h b/fs/xfs/xfs_buf_mem.h
index 945f4b610998f..dfb3029113ff7 100644
--- a/fs/xfs/xfs_buf_mem.h
+++ b/fs/xfs/xfs_buf_mem.h
@@ -21,10 +21,12 @@ void xmbuf_free(struct xfs_buftarg *btp);
int xmbuf_map_page(struct xfs_buf *bp);
void xmbuf_unmap_page(struct xfs_buf *bp);
+bool xmbuf_verify_daddr(struct xfs_buftarg *btp, xfs_daddr_t daddr);
#else
# define xfs_buftarg_is_mem(...) (false)
# define xmbuf_map_page(...) (-ENOMEM)
# define xmbuf_unmap_page(...) ((void)0)
+# define xmbuf_verify_daddr(...) (false)
#endif /* CONFIG_XFS_MEMORY_BUFS */
#endif /* __XFS_BUF_MEM_H__ */
diff --git a/fs/xfs/xfs_health.c b/fs/xfs/xfs_health.c
index 9729dc56c6c9a..6ca48a2962b93 100644
--- a/fs/xfs/xfs_health.c
+++ b/fs/xfs/xfs_health.c
@@ -511,6 +511,9 @@ xfs_btree_mark_sick(
struct xfs_btree_cur *cur)
{
switch (cur->bc_ops->type) {
+ case XFS_BTREE_TYPE_MEM:
+ /* no health state tracking for ephemeral btrees */
+ return;
case XFS_BTREE_TYPE_AG:
ASSERT(cur->bc_ops->sick_mask);
xfs_ag_mark_sick(cur->bc_ag.pag, cur->bc_ops->sick_mask);
diff --git a/fs/xfs/xfs_trace.c b/fs/xfs/xfs_trace.c
index ae5be6b589f0e..3f253884fe5b1 100644
--- a/fs/xfs/xfs_trace.c
+++ b/fs/xfs/xfs_trace.c
@@ -37,6 +37,7 @@
#include <linux/iomap.h>
#include "xfs_iomap.h"
#include "xfs_buf_mem.h"
+#include "xfs_btree_mem.h"
/*
* We include this last to have the helpers above available for the trace
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 771008abdc367..17116cc53b0fe 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -79,6 +79,8 @@ union xfs_btree_ptr;
struct xfs_dqtrx;
struct xfs_icwalk;
struct xfs_perag;
+struct xfbtree;
+struct xfs_btree_ops;
#define XFS_ATTR_FILTER_FLAGS \
{ XFS_ATTR_ROOT, "ROOT" }, \
@@ -2499,12 +2501,19 @@ TRACE_EVENT(xfs_btree_alloc_block,
),
TP_fast_assign(
__entry->dev = cur->bc_mp->m_super->s_dev;
- if (cur->bc_ops->type == XFS_BTREE_TYPE_INODE) {
+ switch (cur->bc_ops->type) {
+ case XFS_BTREE_TYPE_INODE:
__entry->agno = 0;
__entry->ino = cur->bc_ino.ip->i_ino;
- } else {
+ break;
+ case XFS_BTREE_TYPE_AG:
__entry->agno = cur->bc_ag.pag->pag_agno;
__entry->ino = 0;
+ break;
+ case XFS_BTREE_TYPE_MEM:
+ __entry->agno = 0;
+ __entry->ino = 0;
+ break;
}
__assign_str(name, cur->bc_ops->name);
__entry->error = error;
@@ -4584,6 +4593,110 @@ TRACE_EVENT(xmbuf_free,
);
#endif /* CONFIG_XFS_MEMORY_BUFS */
+#ifdef CONFIG_XFS_BTREE_IN_MEM
+TRACE_EVENT(xfbtree_init,
+ TP_PROTO(struct xfs_mount *mp, struct xfbtree *xfbt,
+ const struct xfs_btree_ops *ops),
+ TP_ARGS(mp, xfbt, ops),
+ TP_STRUCT__entry(
+ __field(const void *, btree_ops)
+ __field(unsigned long, xfino)
+ __field(unsigned int, leaf_mxr)
+ __field(unsigned int, leaf_mnr)
+ __field(unsigned int, node_mxr)
+ __field(unsigned int, node_mnr)
+ __field(unsigned long long, owner)
+ ),
+ TP_fast_assign(
+ __entry->btree_ops = ops;
+ __entry->xfino = file_inode(xfbt->target->bt_file)->i_ino;
+ __entry->leaf_mxr = xfbt->maxrecs[0];
+ __entry->node_mxr = xfbt->maxrecs[1];
+ __entry->leaf_mnr = xfbt->minrecs[0];
+ __entry->node_mnr = xfbt->minrecs[1];
+ __entry->owner = xfbt->owner;
+ ),
+ TP_printk("xfino 0x%lx btree_ops %pS owner 0x%llx leaf_mxr %u leaf_mnr %u node_mxr %u node_mnr %u",
+ __entry->xfino,
+ __entry->btree_ops,
+ __entry->owner,
+ __entry->leaf_mxr,
+ __entry->leaf_mnr,
+ __entry->node_mxr,
+ __entry->node_mnr)
+);
+
+DECLARE_EVENT_CLASS(xfbtree_buf_class,
+ TP_PROTO(struct xfbtree *xfbt, struct xfs_buf *bp),
+ TP_ARGS(xfbt, bp),
+ TP_STRUCT__entry(
+ __field(unsigned long, xfino)
+ __field(xfs_daddr_t, bno)
+ __field(int, nblks)
+ __field(int, hold)
+ __field(int, pincount)
+ __field(unsigned int, lockval)
+ __field(unsigned int, flags)
+ ),
+ TP_fast_assign(
+ __entry->xfino = file_inode(xfbt->target->bt_file)->i_ino;
+ __entry->bno = xfs_buf_daddr(bp);
+ __entry->nblks = bp->b_length;
+ __entry->hold = atomic_read(&bp->b_hold);
+ __entry->pincount = atomic_read(&bp->b_pin_count);
+ __entry->lockval = bp->b_sema.count;
+ __entry->flags = bp->b_flags;
+ ),
+ TP_printk("xfino 0x%lx daddr 0x%llx bbcount 0x%x hold %d pincount %d lock %d flags %s",
+ __entry->xfino,
+ (unsigned long long)__entry->bno,
+ __entry->nblks,
+ __entry->hold,
+ __entry->pincount,
+ __entry->lockval,
+ __print_flags(__entry->flags, "|", XFS_BUF_FLAGS))
+)
+
+#define DEFINE_XFBTREE_BUF_EVENT(name) \
+DEFINE_EVENT(xfbtree_buf_class, name, \
+ TP_PROTO(struct xfbtree *xfbt, struct xfs_buf *bp), \
+ TP_ARGS(xfbt, bp))
+DEFINE_XFBTREE_BUF_EVENT(xfbtree_create_root_buf);
+DEFINE_XFBTREE_BUF_EVENT(xfbtree_trans_commit_buf);
+DEFINE_XFBTREE_BUF_EVENT(xfbtree_trans_cancel_buf);
+
+DECLARE_EVENT_CLASS(xfbtree_freesp_class,
+ TP_PROTO(struct xfbtree *xfbt, struct xfs_btree_cur *cur,
+ xfs_fileoff_t fileoff),
+ TP_ARGS(xfbt, cur, fileoff),
+ TP_STRUCT__entry(
+ __field(unsigned long, xfino)
+ __string(btname, cur->bc_ops->name)
+ __field(int, nlevels)
+ __field(xfs_fileoff_t, fileoff)
+ ),
+ TP_fast_assign(
+ __entry->xfino = file_inode(xfbt->target->bt_file)->i_ino;
+ __assign_str(btname, cur->bc_ops->name);
+ __entry->nlevels = cur->bc_nlevels;
+ __entry->fileoff = fileoff;
+ ),
+ TP_printk("xfino 0x%lx %sbt nlevels %d fileoff 0x%llx",
+ __entry->xfino,
+ __get_str(btname),
+ __entry->nlevels,
+ (unsigned long long)__entry->fileoff)
+)
+
+#define DEFINE_XFBTREE_FREESP_EVENT(name) \
+DEFINE_EVENT(xfbtree_freesp_class, name, \
+ TP_PROTO(struct xfbtree *xfbt, struct xfs_btree_cur *cur, \
+ xfs_fileoff_t fileoff), \
+ TP_ARGS(xfbt, cur, fileoff))
+DEFINE_XFBTREE_FREESP_EVENT(xfbtree_alloc_block);
+DEFINE_XFBTREE_FREESP_EVENT(xfbtree_free_block);
+#endif /* CONFIG_XFS_BTREE_IN_MEM */
+
#endif /* _TRACE_XFS_H */
#undef TRACE_INCLUDE_PATH
