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ext2: Add direct-io trace points
This patch adds the trace point to ext2 direct-io apis in fs/ext2/file.c Here is how the output looks like a.out-467865 [006] 6758.170968: ext2_dio_write_begin: dev 7:12 ino 0xe isize 0x1000 pos 0x0 len 4096 flags DIRECT|WRITE aio 1 ret 0 a.out-467865 [006] 6758.171061: ext2_dio_write_end: dev 7:12 ino 0xe isize 0x1000 pos 0x0 len 0 flags DIRECT|WRITE aio 1 ret -529 kworker/3:153-444162 [003] 6758.171252: ext2_dio_write_endio: dev 7:12 ino 0xe isize 0x1000 pos 0x0 len 4096 flags DIRECT|WRITE aio 1 ret 0 a.out-468222 [001] 6761.628924: ext2_dio_read_begin: dev 7:12 ino 0xe isize 0x1000 pos 0x0 len 4096 flags DIRECT aio 1 ret 0 a.out-468222 [001] 6761.629063: ext2_dio_read_end: dev 7:12 ino 0xe isize 0x1000 pos 0x0 len 0 flags DIRECT aio 1 ret -529 a.out-468428 [005] 6763.937454: ext2_dio_write_begin: dev 7:12 ino 0xe isize 0x1000 pos 0x0 len 4096 flags DIRECT aio 0 ret 0 a.out-468428 [005] 6763.937829: ext2_dio_write_endio: dev 7:12 ino 0xe isize 0x1000 pos 0x0 len 4096 flags DIRECT aio 0 ret 0 a.out-468428 [005] 6763.937847: ext2_dio_write_end: dev 7:12 ino 0xe isize 0x1000 pos 0x1000 len 0 flags DIRECT aio 0 ret 4096 a.out-468609 [000] 6765.702878: ext2_dio_read_begin: dev 7:12 ino 0xe isize 0x1000 pos 0x0 len 4096 flags DIRECT aio 0 ret 0 a.out-468609 [000] 6765.703243: ext2_dio_read_end: dev 7:12 ino 0xe isize 0x1000 pos 0x1000 len 0 flags DIRECT aio 0 ret 4096 Reported-and-tested-by: Disha Goel <disgoel@linux.ibm.com> [Need to add CFLAGS_trace for fixing unable to find trace file problem] Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz> Message-Id: <b8b0897fa2b273a448d7b4ba7317357ac73c08bc.1682069716.git.ritesh.list@gmail.com>
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@ -6,7 +6,10 @@
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obj-$(CONFIG_EXT2_FS) += ext2.o
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ext2-y := balloc.o dir.o file.o ialloc.o inode.o \
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ioctl.o namei.o super.o symlink.o
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ioctl.o namei.o super.o symlink.o trace.o
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# For tracepoints to include our trace.h from tracepoint infrastructure
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CFLAGS_trace.o := -I$(src)
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ext2-$(CONFIG_EXT2_FS_XATTR) += xattr.o xattr_user.o xattr_trusted.o
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ext2-$(CONFIG_EXT2_FS_POSIX_ACL) += acl.o
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@ -29,6 +29,7 @@
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#include "ext2.h"
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#include "xattr.h"
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#include "acl.h"
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#include "trace.h"
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#ifdef CONFIG_FS_DAX
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static ssize_t ext2_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
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@ -168,9 +169,11 @@ static ssize_t ext2_dio_read_iter(struct kiocb *iocb, struct iov_iter *to)
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struct inode *inode = file->f_mapping->host;
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ssize_t ret;
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trace_ext2_dio_read_begin(iocb, to, 0);
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inode_lock_shared(inode);
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ret = iomap_dio_rw(iocb, to, &ext2_iomap_ops, NULL, 0, NULL, 0);
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inode_unlock_shared(inode);
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trace_ext2_dio_read_end(iocb, to, ret);
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return ret;
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}
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@ -198,6 +201,7 @@ static int ext2_dio_write_end_io(struct kiocb *iocb, ssize_t size,
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mark_inode_dirty(inode);
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}
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out:
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trace_ext2_dio_write_endio(iocb, size, error);
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return error;
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}
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@ -214,7 +218,9 @@ static ssize_t ext2_dio_write_iter(struct kiocb *iocb, struct iov_iter *from)
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unsigned long blocksize = inode->i_sb->s_blocksize;
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loff_t offset = iocb->ki_pos;
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loff_t count = iov_iter_count(from);
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ssize_t status = 0;
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trace_ext2_dio_write_begin(iocb, from, 0);
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inode_lock(inode);
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ret = generic_write_checks(iocb, from);
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if (ret <= 0)
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@ -242,7 +248,6 @@ static ssize_t ext2_dio_write_iter(struct kiocb *iocb, struct iov_iter *from)
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/* handle case for partial write and for fallback to buffered write */
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if (ret >= 0 && iov_iter_count(from)) {
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loff_t pos, endbyte;
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ssize_t status;
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int ret2;
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iocb->ki_flags &= ~IOCB_DIRECT;
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@ -268,6 +273,9 @@ static ssize_t ext2_dio_write_iter(struct kiocb *iocb, struct iov_iter *from)
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out_unlock:
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inode_unlock(inode);
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if (status)
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trace_ext2_dio_write_buff_end(iocb, from, status);
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trace_ext2_dio_write_end(iocb, from, ret);
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return ret;
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}
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6
fs/ext2/trace.c
Normal file
6
fs/ext2/trace.c
Normal file
@ -0,0 +1,6 @@
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// SPDX-License-Identifier: GPL-2.0
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#include "ext2.h"
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#include <linux/uio.h>
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#define CREATE_TRACE_POINTS
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#include "trace.h"
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94
fs/ext2/trace.h
Normal file
94
fs/ext2/trace.h
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@ -0,0 +1,94 @@
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// SPDX-License-Identifier: GPL-2.0
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM ext2
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#if !defined(_EXT2_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _EXT2_TRACE_H
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#include <linux/tracepoint.h>
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DECLARE_EVENT_CLASS(ext2_dio_class,
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TP_PROTO(struct kiocb *iocb, struct iov_iter *iter, ssize_t ret),
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TP_ARGS(iocb, iter, ret),
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TP_STRUCT__entry(
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__field(dev_t, dev)
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__field(ino_t, ino)
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__field(loff_t, isize)
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__field(loff_t, pos)
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__field(size_t, count)
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__field(int, ki_flags)
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__field(bool, aio)
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__field(ssize_t, ret)
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),
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TP_fast_assign(
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__entry->dev = file_inode(iocb->ki_filp)->i_sb->s_dev;
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__entry->ino = file_inode(iocb->ki_filp)->i_ino;
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__entry->isize = file_inode(iocb->ki_filp)->i_size;
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__entry->pos = iocb->ki_pos;
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__entry->count = iov_iter_count(iter);
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__entry->ki_flags = iocb->ki_flags;
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__entry->aio = !is_sync_kiocb(iocb);
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__entry->ret = ret;
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),
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TP_printk("dev %d:%d ino 0x%lx isize 0x%llx pos 0x%llx len %zu flags %s aio %d ret %zd",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->ino,
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__entry->isize,
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__entry->pos,
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__entry->count,
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__print_flags(__entry->ki_flags, "|", TRACE_IOCB_STRINGS),
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__entry->aio,
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__entry->ret)
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);
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#define DEFINE_DIO_RW_EVENT(name) \
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DEFINE_EVENT(ext2_dio_class, name, \
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TP_PROTO(struct kiocb *iocb, struct iov_iter *iter, ssize_t ret), \
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TP_ARGS(iocb, iter, ret))
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DEFINE_DIO_RW_EVENT(ext2_dio_write_begin);
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DEFINE_DIO_RW_EVENT(ext2_dio_write_end);
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DEFINE_DIO_RW_EVENT(ext2_dio_write_buff_end);
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DEFINE_DIO_RW_EVENT(ext2_dio_read_begin);
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DEFINE_DIO_RW_EVENT(ext2_dio_read_end);
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TRACE_EVENT(ext2_dio_write_endio,
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TP_PROTO(struct kiocb *iocb, ssize_t size, int ret),
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TP_ARGS(iocb, size, ret),
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TP_STRUCT__entry(
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__field(dev_t, dev)
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__field(ino_t, ino)
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__field(loff_t, isize)
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__field(loff_t, pos)
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__field(ssize_t, size)
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__field(int, ki_flags)
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__field(bool, aio)
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__field(int, ret)
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),
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TP_fast_assign(
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__entry->dev = file_inode(iocb->ki_filp)->i_sb->s_dev;
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__entry->ino = file_inode(iocb->ki_filp)->i_ino;
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__entry->isize = file_inode(iocb->ki_filp)->i_size;
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__entry->pos = iocb->ki_pos;
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__entry->size = size;
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__entry->ki_flags = iocb->ki_flags;
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__entry->aio = !is_sync_kiocb(iocb);
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__entry->ret = ret;
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),
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TP_printk("dev %d:%d ino 0x%lx isize 0x%llx pos 0x%llx len %zd flags %s aio %d ret %d",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->ino,
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__entry->isize,
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__entry->pos,
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__entry->size,
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__print_flags(__entry->ki_flags, "|", TRACE_IOCB_STRINGS),
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__entry->aio,
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__entry->ret)
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);
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#endif /* _EXT2_TRACE_H */
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#undef TRACE_INCLUDE_PATH
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#define TRACE_INCLUDE_PATH .
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#define TRACE_INCLUDE_FILE trace
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#include <trace/define_trace.h>
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