2020-07-25 12:34:12

by Dmitry Monakhov

Subject: [PATCH] ext4: export msg_count and warning_count via sysfs

This numbers can be analized by system automation similar to errors_count.
In ideal world it would be nice to have separate counters for different
log-levels, but this makes this patch too intrusive.

Signed-off-by: Dmitry Monakhov <[email protected]>
---
fs/ext4/ext4.h | 2 ++
fs/ext4/super.c | 12 +++++++++---
fs/ext4/sysfs.c | 7 +++++++
3 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 99a737c..e7bef27 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1573,6 +1573,8 @@ struct ext4_sb_info {
struct ratelimit_state s_err_ratelimit_state;
struct ratelimit_state s_warning_ratelimit_state;
struct ratelimit_state s_msg_ratelimit_state;
+ atomic_t s_warning_count;
+ atomic_t s_msg_count;

/* Encryption context for '-o test_dummy_encryption' */
struct fscrypt_dummy_context s_dummy_enc_ctx;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 7a5a8a5..4c408d3 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -744,6 +744,7 @@ void __ext4_msg(struct super_block *sb,
struct va_format vaf;
va_list args;

+ atomic_inc(&EXT4_SB(sb)->s_msg_count);
if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
return;

@@ -754,9 +755,12 @@ void __ext4_msg(struct super_block *sb,
va_end(args);
}

-#define ext4_warning_ratelimit(sb) \
- ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
- "EXT4-fs warning")
+static int ext4_warning_ratelimit(struct super_block *sb)
+{
+ atomic_inc(&EXT4_SB(sb)->s_warning_count);
+ return ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
+ "EXT4-fs warning");
+}

void __ext4_warning(struct super_block *sb, const char *function,
unsigned int line, const char *fmt, ...)
@@ -4819,6 +4823,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
+ atomic_set(&sbi->s_warning_count, 0);
+ atomic_set(&sbi->s_msg_count, 0);

kfree(orig_data);
return 0;
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index 6c9fc9e..4f15992 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -189,6 +189,9 @@ static struct ext4_attr ext4_attr_##_name = { \
#define EXT4_RW_ATTR_SBI_UL(_name,_elname) \
EXT4_ATTR_OFFSET(_name, 0644, pointer_ul, ext4_sb_info, _elname)

+#define EXT4_RO_ATTR_SBI_ATOMIC(_name,_elname) \
+ EXT4_ATTR_OFFSET(_name, 0444, pointer_atomic, ext4_sb_info, _elname)
+
#define EXT4_ATTR_PTR(_name,_mode,_id,_ptr) \
static struct ext4_attr ext4_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode }, \
@@ -226,6 +229,8 @@ EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
#ifdef CONFIG_EXT4_DEBUG
EXT4_RW_ATTR_SBI_UL(simulate_fail, s_simulate_fail);
#endif
+EXT4_RO_ATTR_SBI_ATOMIC(warning_count, s_warning_count);
+EXT4_RO_ATTR_SBI_ATOMIC(msg_count, s_msg_count);
EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
EXT4_RO_ATTR_ES_U8(first_error_errcode, s_first_error_errcode);
EXT4_RO_ATTR_ES_U8(last_error_errcode, s_last_error_errcode);
@@ -267,6 +272,8 @@ static struct attribute *ext4_attrs[] = {
ATTR_LIST(msg_ratelimit_interval_ms),
ATTR_LIST(msg_ratelimit_burst),
ATTR_LIST(errors_count),
+ ATTR_LIST(warning_count),
+ ATTR_LIST(msg_count),
ATTR_LIST(first_error_ino),
ATTR_LIST(last_error_ino),
ATTR_LIST(first_error_block),
--
2.7.4

2020-08-06 16:32:43

by Theodore Ts'o

Subject: Re: [PATCH] ext4: export msg_count and warning_count via sysfs

On Sat, Jul 25, 2020 at 12:33:13PM +0000, Dmitry Monakhov wrote:
> This numbers can be analized by system automation similar to errors_count.
> In ideal world it would be nice to have separate counters for different
> log-levels, but this makes this patch too intrusive.
>
> Signed-off-by: Dmitry Monakhov <[email protected]>

Applied, thanks.

- Ted