[PATCH 09/14] iomap: lift common tracing code from xfs to iomap

Christoph Hellwig
2019-10-17T17:57:32Z

Lift the xfs code for tracing address space operations to the iomap
layer.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/iomap/Makefile | 16 ++++----
fs/iomap/buffered-io.c | 9 +++++
fs/iomap/trace.c | 12 ++++++
fs/iomap/trace.h | 87 ++++++++++++++++++++++++++++++++++++++++++
fs/xfs/xfs_aops.c | 27 ++-----------
fs/xfs/xfs_trace.h | 26 -------------
6 files changed, 120 insertions(+), 57 deletions(-)
create mode 100644 fs/iomap/trace.c
create mode 100644 fs/iomap/trace.h

diff --git a/fs/iomap/Makefile b/fs/iomap/Makefile
index 93cd11938bf5..eef2722d93a1 100644
--- a/fs/iomap/Makefile
+++ b/fs/iomap/Makefile
@@ -3,13 +3,15 @@
# Copyright (c) 2019 Oracle.
# All Rights Reserved.
#
-obj-$(CONFIG_FS_IOMAP) += iomap.o

-iomap-y += \
- apply.o \
- buffered-io.o \
- direct-io.o \
- fiemap.o \
- seek.o
+ccflags-y += -I $(srctree)/$(src) # needed for trace events
+
+obj-$(CONFIG_FS_IOMAP) += iomap.o

+iomap-y += trace.o \
+ apply.o \
+ buffered-io.o \
+ direct-io.o \
+ fiemap.o \
+ seek.o
iomap-$(CONFIG_SWAP) += swapfile.o
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 181ee8477aad..55e514899b8c 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -16,6 +16,7 @@
#include <linux/bio.h>
#include <linux/sched/signal.h>
#include <linux/migrate.h>
+#include "trace.h"

#include "../internal.h"

@@ -301,6 +302,8 @@ iomap_readpage(struct page *page, const struct iomap_ops *ops)
unsigned poff;
loff_t ret;

+ trace_iomap_readpage(page->mapping->host, 1);
+
for (poff = 0; poff < PAGE_SIZE; poff += ret) {
ret = iomap_apply(inode, page_offset(page) + poff,
PAGE_SIZE - poff, 0, ops, &ctx,
@@ -397,6 +400,8 @@ iomap_readpages(struct address_space *mapping, struct list_head *pages,
loff_t last = page_offset(list_entry(pages->next, struct page, lru));
loff_t length = last - pos + PAGE_SIZE, ret = 0;

+ trace_iomap_readpages(mapping->host, nr_pages);
+
while (length > 0) {
ret = iomap_apply(mapping->host, pos, length, 0, ops,
&ctx, iomap_readpages_actor);
@@ -463,6 +468,8 @@ EXPORT_SYMBOL_GPL(iomap_is_partially_uptodate);
int
iomap_releasepage(struct page *page, gfp_t gfp_mask)
{
+ trace_iomap_releasepage(page->mapping->host, page, 0, 0);
+
/*
* mm accommodates an old ext3 case where clean pages might not have had
* the dirty bit cleared. Thus, it can send actual dirty pages to
@@ -478,6 +485,8 @@ EXPORT_SYMBOL_GPL(iomap_releasepage);
void
iomap_invalidatepage(struct page *page, unsigned int offset, unsigned int len)
{
+ trace_iomap_invalidatepage(page->mapping->host, page, offset, len);
+
/*
* If we are invalidating the entire page, clear the dirty state from it
* and release it to avoid unnecessary buildup of the LRU.
diff --git a/fs/iomap/trace.c b/fs/iomap/trace.c
new file mode 100644
index 000000000000..da217246b1a9
--- /dev/null
+++ b/fs/iomap/trace.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 Christoph Hellwig
+ */
+#include <linux/iomap.h>
+
+/*
+ * We include this last to have the helpers above available for the trace
+ * event implementations.
+ */
+#define CREATE_TRACE_POINTS
+#include "trace.h"
diff --git a/fs/iomap/trace.h b/fs/iomap/trace.h
new file mode 100644
index 000000000000..63a98ad01b0f
--- /dev/null
+++ b/fs/iomap/trace.h
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2009-2019 Christoph Hellwig
+ *
+ * NOTE: none of these tracepoints shall be consider a stable kernel ABI
+ * as they can change at any time.
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM iomap
+
+#if !defined(_IOMAP_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _IOMAP_TRACE_H
+
+#include <linux/tracepoint.h>
+
+struct inode;
+
+DECLARE_EVENT_CLASS(iomap_readpage_class,
+ TP_PROTO(struct inode *inode, int nr_pages),
+ TP_ARGS(inode, nr_pages),
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(u64, ino)
+ __field(int, nr_pages)
+ ),
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->ino = inode->i_ino;
+ __entry->nr_pages = nr_pages;
+ ),
+ TP_printk("dev %d:%d ino 0x%llx nr_pages %d",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->ino,
+ __entry->nr_pages)
+)
+
+#define DEFINE_READPAGE_EVENT(name) \
+DEFINE_EVENT(iomap_readpage_class, name, \
+ TP_PROTO(struct inode *inode, int nr_pages), \
+ TP_ARGS(inode, nr_pages))
+DEFINE_READPAGE_EVENT(iomap_readpage);
+DEFINE_READPAGE_EVENT(iomap_readpages);
+
+DECLARE_EVENT_CLASS(iomap_page_class,
+ TP_PROTO(struct inode *inode, struct page *page, unsigned long off,
+ unsigned int len),
+ TP_ARGS(inode, page, off, len),
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __field(u64, ino)
+ __field(pgoff_t, pgoff)
+ __field(loff_t, size)
+ __field(unsigned long, offset)
+ __field(unsigned int, length)
+ ),
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->ino = inode->i_ino;
+ __entry->pgoff = page_offset(page);
+ __entry->size = i_size_read(inode);
+ __entry->offset = off;
+ __entry->length = len;
+ ),
+ TP_printk("dev %d:%d ino 0x%llx pgoff 0x%lx size 0x%llx offset %lx "
+ "length %x",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->ino,
+ __entry->pgoff,
+ __entry->size,
+ __entry->offset,
+ __entry->length)
+)
+
+#define DEFINE_PAGE_EVENT(name) \
+DEFINE_EVENT(iomap_page_class, name, \
+ TP_PROTO(struct inode *inode, struct page *page, unsigned long off, \
+ unsigned int len), \
+ TP_ARGS(inode, page, off, len))
+DEFINE_PAGE_EVENT(iomap_releasepage);
+DEFINE_PAGE_EVENT(iomap_invalidatepage);
+
+#endif /* _IOMAP_TRACE_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE trace
+#include <trace/define_trace.h>
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 00fe40b35f72..f08563e2bd9f 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -823,16 +823,6 @@ xfs_add_to_ioend(
wbc_account_cgroup_owner(wbc, page, len);
}

-STATIC void
-xfs_vm_invalidatepage(
- struct page *page,
- unsigned int offset,
- unsigned int length)
-{
- trace_xfs_invalidatepage(page->mapping->host, page, offset, length);
- iomap_invalidatepage(page, offset, length);
-}
-
/*
* If the page has delalloc blocks on it, we need to punch them out before we
* invalidate the page. If we don't, we leave a stale delalloc mapping on the
@@ -867,7 +857,7 @@ xfs_aops_discard_page(
if (error && !XFS_FORCED_SHUTDOWN(mp))
xfs_alert(mp, "page discard unable to remove delalloc mapping.");
out_invalidate:
- xfs_vm_invalidatepage(page, 0, PAGE_SIZE);
+ iomap_invalidatepage(page, 0, PAGE_SIZE);
}

/*
@@ -1147,15 +1137,6 @@ xfs_dax_writepages(
xfs_find_bdev_for_inode(mapping->host), wbc);
}

-STATIC int
-xfs_vm_releasepage(
- struct page *page,
- gfp_t gfp_mask)
-{
- trace_xfs_releasepage(page->mapping->host, page, 0, 0);
- return iomap_releasepage(page, gfp_mask);
-}
-
STATIC sector_t
xfs_vm_bmap(
struct address_space *mapping,
@@ -1184,7 +1165,6 @@ xfs_vm_readpage(
struct file *unused,
struct page *page)
{
- trace_xfs_vm_readpage(page->mapping->host, 1);
return iomap_readpage(page, &xfs_iomap_ops);
}

@@ -1195,7 +1175,6 @@ xfs_vm_readpages(
struct list_head *pages,
unsigned nr_pages)
{
- trace_xfs_vm_readpages(mapping->host, nr_pages);
return iomap_readpages(mapping, pages, nr_pages, &xfs_iomap_ops);
}

@@ -1215,8 +1194,8 @@ const struct address_space_operations xfs_address_space_operations = {
.writepage = xfs_vm_writepage,
.writepages = xfs_vm_writepages,
.set_page_dirty = iomap_set_page_dirty,
- .releasepage = xfs_vm_releasepage,
- .invalidatepage = xfs_vm_invalidatepage,
+ .releasepage = iomap_releasepage,
+ .invalidatepage = iomap_invalidatepage,
.bmap = xfs_vm_bmap,
.direct_IO = noop_direct_IO,
.migratepage = iomap_migrate_page,
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index eaae275ed430..eae4b29c174e 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -1197,32 +1197,6 @@ DEFINE_PAGE_EVENT(xfs_writepage);
DEFINE_PAGE_EVENT(xfs_releasepage);
DEFINE_PAGE_EVENT(xfs_invalidatepage);

-DECLARE_EVENT_CLASS(xfs_readpage_class,
- TP_PROTO(struct inode *inode, int nr_pages),
- TP_ARGS(inode, nr_pages),
- TP_STRUCT__entry(
- __field(dev_t, dev)
- __field(xfs_ino_t, ino)
- __field(int, nr_pages)
- ),
- TP_fast_assign(
- __entry->dev = inode->i_sb->s_dev;
- __entry->ino = inode->i_ino;
- __entry->nr_pages = nr_pages;
- ),
- TP_printk("dev %d:%d ino 0x%llx nr_pages %d",
- MAJOR(__entry->dev), MINOR(__entry->dev),
- __entry->ino,
- __entry->nr_pages)
-)
-
-#define DEFINE_READPAGE_EVENT(name) \
-DEFINE_EVENT(xfs_readpage_class, name, \
- TP_PROTO(struct inode *inode, int nr_pages), \
- TP_ARGS(inode, nr_pages))
-DEFINE_READPAGE_EVENT(xfs_vm_readpage);
-DEFINE_READPAGE_EVENT(xfs_vm_readpages);
-
DECLARE_EVENT_CLASS(xfs_imap_class,
TP_PROTO(struct xfs_inode *ip, xfs_off_t offset, ssize_t count,
int whichfork, struct xfs_bmbt_irec *irec),
--
2.20.1