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[1/7] ext4: add tracepoints for shutdown and file system errors

Message ID 20180220023038.19883-2-tytso@mit.edu
State Accepted, archived
Headers show
Series ext4: fix up shutdown handling | expand

Commit Message

Theodore Ts'o Feb. 20, 2018, 2:30 a.m. UTC 
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---
 fs/ext4/ioctl.c             |  1 +
 fs/ext4/super.c             |  4 ++++
 include/trace/events/ext4.h | 43 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 48 insertions(+)

Comments

Jan Kara March 6, 2018, 4:50 p.m. UTC | #1 
On Mon 19-02-18 21:30:32, Theodore Ts'o wrote:
> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
> ---
>  fs/ext4/ioctl.c             |  1 +
>  fs/ext4/super.c             |  4 ++++
>  include/trace/events/ext4.h | 43 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 48 insertions(+)
> 
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index 7e99ad02f1ba..4d1b1575f8ac 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -481,6 +481,7 @@ static int ext4_shutdown(struct super_block *sb, unsigned long arg)
>  		return 0;
>  
>  	ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
> +	trace_ext4_shutdown(sb, flags);
>  
>  	switch (flags) {
>  	case EXT4_GOING_FLAGS_DEFAULT:
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 39bf464c35f1..756f515b762d 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -448,6 +448,7 @@ void __ext4_error(struct super_block *sb, const char *function,
>  	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
>  		return;
>  
> +	trace_ext4_error(sb, function, line);
>  	if (ext4_error_ratelimit(sb)) {
>  		va_start(args, fmt);
>  		vaf.fmt = fmt;

What are the 'error' tracepoints good for? So that you have occurrence of
ext4_error() calls in the same stream of events as other tracepoints?

Otherwise the patch looks good. You can add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza
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Patch

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 7e99ad02f1ba..4d1b1575f8ac 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -481,6 +481,7 @@  static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 		return 0;
 
 	ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
+	trace_ext4_shutdown(sb, flags);
 
 	switch (flags) {
 	case EXT4_GOING_FLAGS_DEFAULT:
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 39bf464c35f1..756f515b762d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -448,6 +448,7 @@  void __ext4_error(struct super_block *sb, const char *function,
 	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 		return;
 
+	trace_ext4_error(sb, function, line);
 	if (ext4_error_ratelimit(sb)) {
 		va_start(args, fmt);
 		vaf.fmt = fmt;
@@ -472,6 +473,7 @@  void __ext4_error_inode(struct inode *inode, const char *function,
 	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 		return;
 
+	trace_ext4_error(inode->i_sb, function, line);
 	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
 	es->s_last_error_block = cpu_to_le64(block);
 	if (ext4_error_ratelimit(inode->i_sb)) {
@@ -507,6 +509,7 @@  void __ext4_error_file(struct file *file, const char *function,
 	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
 		return;
 
+	trace_ext4_error(inode->i_sb, function, line);
 	es = EXT4_SB(inode->i_sb)->s_es;
 	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
 	if (ext4_error_ratelimit(inode->i_sb)) {
@@ -719,6 +722,7 @@  __acquires(bitlock)
 	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
 		return;
 
+	trace_ext4_error(sb, function, line);
 	es->s_last_error_ino = cpu_to_le32(ino);
 	es->s_last_error_block = cpu_to_le64(block);
 	__save_error_info(sb, function, line);
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 4d0e3af4e561..0e31eb136c57 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -2585,6 +2585,49 @@  DEFINE_GETFSMAP_EVENT(ext4_getfsmap_low_key);
 DEFINE_GETFSMAP_EVENT(ext4_getfsmap_high_key);
 DEFINE_GETFSMAP_EVENT(ext4_getfsmap_mapping);
 
+TRACE_EVENT(ext4_shutdown,
+	TP_PROTO(struct super_block *sb, unsigned long flags),
+
+	TP_ARGS(sb, flags),
+
+	TP_STRUCT__entry(
+		__field(	dev_t,	dev			)
+		__field(     unsigned,	flags			)
+	),
+
+	TP_fast_assign(
+		__entry->dev	= sb->s_dev;
+		__entry->flags	= flags;
+	),
+
+	TP_printk("dev %d,%d flags %u",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __entry->flags)
+);
+
+TRACE_EVENT(ext4_error,
+	TP_PROTO(struct super_block *sb, const char *function,
+		 unsigned int line),
+
+	TP_ARGS(sb, function, line),
+
+	TP_STRUCT__entry(
+		__field(	dev_t,	dev			)
+		__field( const char *,	function		)
+		__field(     unsigned,	line			)
+	),
+
+	TP_fast_assign(
+		__entry->dev	= sb->s_dev;
+		__entry->function = function;
+		__entry->line	= line;
+	),
+
+	TP_printk("dev %d,%d function %s line %u",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __entry->function, __entry->line)
+);
+
 #endif /* _TRACE_EXT4_H */
 
 /* This part must be outside protection */