[PATCH 05/10] xfs: simplify the read/write tracepoints

Christoph Hellwig
2021-01-12T16:29:07Z

Pass the iocb and iov_iter to the tracepoints and leave decoding of
actual arguments to the code only run when tracing is enabled.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/xfs_file.c | 20 ++++++++------------
fs/xfs/xfs_trace.h | 18 +++++++++---------
2 files changed, 17 insertions(+), 21 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 97836ec53397d4..aa64e78fc3c467 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -220,12 +220,11 @@ xfs_file_dio_read(
struct iov_iter *to)
{
struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
- size_t count = iov_iter_count(to);
ssize_t ret;

- trace_xfs_file_direct_read(ip, count, iocb->ki_pos);
+ trace_xfs_file_direct_read(iocb, to);

- if (!count)
+ if (!iov_iter_count(to))
return 0; /* skip atime */

file_accessed(iocb->ki_filp);
@@ -246,12 +245,11 @@ xfs_file_dax_read(
struct iov_iter *to)
{
struct xfs_inode *ip = XFS_I(iocb->ki_filp->f_mapping->host);
- size_t count = iov_iter_count(to);
ssize_t ret = 0;

- trace_xfs_file_dax_read(ip, count, iocb->ki_pos);
+ trace_xfs_file_dax_read(iocb, to);

- if (!count)
+ if (!iov_iter_count(to))
return 0; /* skip atime */

ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
@@ -272,7 +270,7 @@ xfs_file_buffered_read(
struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
ssize_t ret;

- trace_xfs_file_buffered_read(ip, iov_iter_count(to), iocb->ki_pos);
+ trace_xfs_file_buffered_read(iocb, to);

ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
if (ret)
@@ -599,7 +597,7 @@ xfs_file_dio_write(
iolock = XFS_IOLOCK_SHARED;
}

- trace_xfs_file_direct_write(ip, count, iocb->ki_pos);
+ trace_xfs_file_direct_write(iocb, from);
/*
* If unaligned, this is the only IO in-flight. Wait on it before we
* release the iolock to prevent subsequent overlapping IO.
@@ -622,7 +620,6 @@ xfs_file_dax_write(
struct xfs_inode *ip = XFS_I(inode);
int iolock = XFS_IOLOCK_EXCL;
ssize_t ret, error = 0;
- size_t count;
loff_t pos;

ret = xfs_ilock_iocb(iocb, iolock);
@@ -633,9 +630,8 @@ xfs_file_dax_write(
goto out;

pos = iocb->ki_pos;
- count = iov_iter_count(from);

- trace_xfs_file_dax_write(ip, count, pos);
+ trace_xfs_file_dax_write(iocb, from);
ret = dax_iomap_rw(iocb, from, &xfs_direct_write_iomap_ops);
if (ret > 0 && iocb->ki_pos > i_size_read(inode)) {
i_size_write(inode, iocb->ki_pos);
@@ -683,7 +679,7 @@ xfs_file_buffered_write(
/* We can write back this queue in page reclaim */
current->backing_dev_info = inode_to_bdi(inode);

- trace_xfs_file_buffered_write(ip, iov_iter_count(from), iocb->ki_pos);
+ trace_xfs_file_buffered_write(iocb, from);
ret = iomap_file_buffered_write(iocb, from,
&xfs_buffered_write_iomap_ops);
if (likely(ret >= 0))
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 5a263ae3d4f008..a6d04d860a565e 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -1287,8 +1287,8 @@ TRACE_EVENT(xfs_log_assign_tail_lsn,
)

DECLARE_EVENT_CLASS(xfs_file_class,
- TP_PROTO(struct xfs_inode *ip, size_t count, loff_t offset),
- TP_ARGS(ip, count, offset),
+ TP_PROTO(struct kiocb *iocb, struct iov_iter *iter),
+ TP_ARGS(iocb, iter),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(xfs_ino_t, ino)
@@ -1297,11 +1297,11 @@ DECLARE_EVENT_CLASS(xfs_file_class,
__field(size_t, count)
),
TP_fast_assign(
- __entry->dev = VFS_I(ip)->i_sb->s_dev;
- __entry->ino = ip->i_ino;
- __entry->size = ip->i_d.di_size;
- __entry->offset = offset;
- __entry->count = count;
+ __entry->dev = file_inode(iocb->ki_filp)->i_sb->s_dev;
+ __entry->ino = XFS_I(file_inode(iocb->ki_filp))->i_ino;
+ __entry->size = XFS_I(file_inode(iocb->ki_filp))->i_d.di_size;
+ __entry->offset = iocb->ki_pos;
+ __entry->count = iov_iter_count(iter);
),
TP_printk("dev %d:%d ino 0x%llx size 0x%llx offset 0x%llx count 0x%zx",
MAJOR(__entry->dev), MINOR(__entry->dev),
@@ -1313,8 +1313,8 @@ DECLARE_EVENT_CLASS(xfs_file_class,

#define DEFINE_RW_EVENT(name) \
DEFINE_EVENT(xfs_file_class, name, \
- TP_PROTO(struct xfs_inode *ip, size_t count, loff_t offset), \
- TP_ARGS(ip, count, offset))
+ TP_PROTO(struct kiocb *iocb, struct iov_iter *iter), \
+ TP_ARGS(iocb, iter))
DEFINE_RW_EVENT(xfs_file_buffered_read);
DEFINE_RW_EVENT(xfs_file_direct_read);
DEFINE_RW_EVENT(xfs_file_dax_read);
--
2.29.2