[PATCH 5.16 0139/1017] ext4: fix ext4_fc_stats trace point

Greg Kroah-Hartman
2022-04-05T12:03:27Z

From: Ritesh Harjani <riteshh@linux.ibm.com>

commit 7af1974af0a9ba8a8ed2e3e947d87dd4d9a78d27 upstream.

ftrace's __print_symbolic() requires that any enum values used in the
symbol to string translation table be wrapped in a TRACE_DEFINE_ENUM
so that the enum value can be decoded from the ftrace ring buffer by
user space tooling.

This patch also fixes few other problems found in this trace point.
e.g. dereferencing structures in TP_printk which should not be done
at any cost.

Also to avoid checkpatch warnings, this patch removes those
whitespaces/tab stops issues.

Cc: stable@kernel.org
Fixes: aa75f4d3daae ("ext4: main fast-commit commit path")
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/b4b9691414c35c62e570b723e661c80674169f9a.1647057583.git.riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/trace/events/ext4.h | 80 +++++++++++++++++++++++++++-----------------
1 file changed, 50 insertions(+), 30 deletions(-)

--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -95,6 +95,17 @@ TRACE_DEFINE_ENUM(ES_REFERENCED_B);
{ FALLOC_FL_COLLAPSE_RANGE, "COLLAPSE_RANGE"}, \
{ FALLOC_FL_ZERO_RANGE, "ZERO_RANGE"})

+TRACE_DEFINE_ENUM(EXT4_FC_REASON_XATTR);
+TRACE_DEFINE_ENUM(EXT4_FC_REASON_CROSS_RENAME);
+TRACE_DEFINE_ENUM(EXT4_FC_REASON_JOURNAL_FLAG_CHANGE);
+TRACE_DEFINE_ENUM(EXT4_FC_REASON_NOMEM);
+TRACE_DEFINE_ENUM(EXT4_FC_REASON_SWAP_BOOT);
+TRACE_DEFINE_ENUM(EXT4_FC_REASON_RESIZE);
+TRACE_DEFINE_ENUM(EXT4_FC_REASON_RENAME_DIR);
+TRACE_DEFINE_ENUM(EXT4_FC_REASON_FALLOC_RANGE);
+TRACE_DEFINE_ENUM(EXT4_FC_REASON_INODE_JOURNAL_DATA);
+TRACE_DEFINE_ENUM(EXT4_FC_REASON_MAX);
+
#define show_fc_reason(reason) \
__print_symbolic(reason, \
{ EXT4_FC_REASON_XATTR, "XATTR"}, \
@@ -2723,41 +2734,50 @@ TRACE_EVENT(ext4_fc_commit_stop,

#define FC_REASON_NAME_STAT(reason) \
show_fc_reason(reason), \
- __entry->sbi->s_fc_stats.fc_ineligible_reason_count[reason]
+ __entry->fc_ineligible_rc[reason]

TRACE_EVENT(ext4_fc_stats,
- TP_PROTO(struct super_block *sb),
+ TP_PROTO(struct super_block *sb),
+
+ TP_ARGS(sb),
+
+ TP_STRUCT__entry(
+ __field(dev_t, dev)
+ __array(unsigned int, fc_ineligible_rc, EXT4_FC_REASON_MAX)
+ __field(unsigned long, fc_commits)
+ __field(unsigned long, fc_ineligible_commits)
+ __field(unsigned long, fc_numblks)
+ ),

- TP_ARGS(sb),
+ TP_fast_assign(
+ int i;

- TP_STRUCT__entry(
- __field(dev_t, dev)
- __field(struct ext4_sb_info *, sbi)
- __field(int, count)
- ),
-
- TP_fast_assign(
- __entry->dev = sb->s_dev;
- __entry->sbi = EXT4_SB(sb);
- ),
-
- TP_printk("dev %d:%d fc ineligible reasons:\n"
- "%s:%d, %s:%d, %s:%d, %s:%d, %s:%d, %s:%d, %s:%d, %s:%d, %s:%d; "
- "num_commits:%ld, ineligible: %ld, numblks: %ld",
- MAJOR(__entry->dev), MINOR(__entry->dev),
- FC_REASON_NAME_STAT(EXT4_FC_REASON_XATTR),
- FC_REASON_NAME_STAT(EXT4_FC_REASON_CROSS_RENAME),
- FC_REASON_NAME_STAT(EXT4_FC_REASON_JOURNAL_FLAG_CHANGE),
- FC_REASON_NAME_STAT(EXT4_FC_REASON_NOMEM),
- FC_REASON_NAME_STAT(EXT4_FC_REASON_SWAP_BOOT),
- FC_REASON_NAME_STAT(EXT4_FC_REASON_RESIZE),
- FC_REASON_NAME_STAT(EXT4_FC_REASON_RENAME_DIR),
- FC_REASON_NAME_STAT(EXT4_FC_REASON_FALLOC_RANGE),
- FC_REASON_NAME_STAT(EXT4_FC_REASON_INODE_JOURNAL_DATA),
- __entry->sbi->s_fc_stats.fc_num_commits,
- __entry->sbi->s_fc_stats.fc_ineligible_commits,
- __entry->sbi->s_fc_stats.fc_numblks)
+ __entry->dev = sb->s_dev;
+ for (i = 0; i < EXT4_FC_REASON_MAX; i++) {
+ __entry->fc_ineligible_rc[i] =
+ EXT4_SB(sb)->s_fc_stats.fc_ineligible_reason_count[i];
+ }
+ __entry->fc_commits = EXT4_SB(sb)->s_fc_stats.fc_num_commits;
+ __entry->fc_ineligible_commits =
+ EXT4_SB(sb)->s_fc_stats.fc_ineligible_commits;
+ __entry->fc_numblks = EXT4_SB(sb)->s_fc_stats.fc_numblks;
+ ),

+ TP_printk("dev %d,%d fc ineligible reasons:\n"
+ "%s:%u, %s:%u, %s:%u, %s:%u, %s:%u, %s:%u, %s:%u, %s:%u, %s:%u "
+ "num_commits:%lu, ineligible: %lu, numblks: %lu",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ FC_REASON_NAME_STAT(EXT4_FC_REASON_XATTR),
+ FC_REASON_NAME_STAT(EXT4_FC_REASON_CROSS_RENAME),
+ FC_REASON_NAME_STAT(EXT4_FC_REASON_JOURNAL_FLAG_CHANGE),
+ FC_REASON_NAME_STAT(EXT4_FC_REASON_NOMEM),
+ FC_REASON_NAME_STAT(EXT4_FC_REASON_SWAP_BOOT),
+ FC_REASON_NAME_STAT(EXT4_FC_REASON_RESIZE),
+ FC_REASON_NAME_STAT(EXT4_FC_REASON_RENAME_DIR),
+ FC_REASON_NAME_STAT(EXT4_FC_REASON_FALLOC_RANGE),
+ FC_REASON_NAME_STAT(EXT4_FC_REASON_INODE_JOURNAL_DATA),
+ __entry->fc_commits, __entry->fc_ineligible_commits,
+ __entry->fc_numblks)
);

#define DEFINE_TRACE_DENTRY_EVENT(__type) \