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Subject[PATCH 2/3] f2fs: trace checkpoint reason in fsync()
Date
From: Chao Yu <yuchao0@huawei.com>

This patch slightly changes need_do_checkpoint to return the detail
info that indicates why we need do checkpoint, then caller could print
it with trace message.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/file.c | 34 ++++++++++++++++++----------------
include/trace/events/f2fs.h | 12 ++++++------
2 files changed, 24 insertions(+), 22 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index cee0f36ba9a1..d9d8b1c372f8 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -141,27 +141,29 @@ static int get_parent_ino(struct inode *inode, nid_t *pino)
return 1;
}

-static inline bool need_do_checkpoint(struct inode *inode)
+static inline int need_do_checkpoint(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
- bool need_cp = false;
+ int cp_reason = 0;

- if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
- need_cp = true;
+ if (!S_ISREG(inode->i_mode))
+ cp_reason = 1;
+ else if (inode->i_nlink != 1)
+ cp_reason = 2;
else if (is_sbi_flag_set(sbi, SBI_NEED_CP))
- need_cp = true;
+ cp_reason = 3;
else if (file_wrong_pino(inode))
- need_cp = true;
+ cp_reason = 4;
else if (!space_for_roll_forward(sbi))
- need_cp = true;
+ cp_reason = 5;
else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
- need_cp = true;
+ cp_reason = 6;
else if (test_opt(sbi, FASTBOOT))
- need_cp = true;
+ cp_reason = 7;
else if (sbi->active_logs == 2)
- need_cp = true;
+ cp_reason = 8;

- return need_cp;
+ return cp_reason;
}

static bool need_inode_page_update(struct f2fs_sb_info *sbi, nid_t ino)
@@ -196,7 +198,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
nid_t ino = inode->i_ino;
int ret = 0;
- bool need_cp = false;
+ bool cp_reason = 0;
struct writeback_control wbc = {
.sync_mode = WB_SYNC_ALL,
.nr_to_write = LONG_MAX,
@@ -215,7 +217,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
clear_inode_flag(inode, FI_NEED_IPU);

if (ret) {
- trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
+ trace_f2fs_sync_file_exit(inode, cp_reason, datasync, ret);
return ret;
}

@@ -246,10 +248,10 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
* sudden-power-off.
*/
down_read(&F2FS_I(inode)->i_sem);
- need_cp = need_do_checkpoint(inode);
+ cp_reason = need_do_checkpoint(inode);
up_read(&F2FS_I(inode)->i_sem);

- if (need_cp) {
+ if (cp_reason) {
/* all the dirty node pages should be flushed for POR */
ret = f2fs_sync_fs(inode->i_sb, 1);

@@ -306,7 +308,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
}
f2fs_update_time(sbi, REQ_TIME);
out:
- trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
+ trace_f2fs_sync_file_exit(inode, cp_reason, datasync, ret);
f2fs_trace_ios(NULL, 1);
return ret;
}
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 009745564214..f1a317e6db79 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -210,14 +210,14 @@ DEFINE_EVENT(f2fs__inode, f2fs_sync_file_enter,

TRACE_EVENT(f2fs_sync_file_exit,

- TP_PROTO(struct inode *inode, int need_cp, int datasync, int ret),
+ TP_PROTO(struct inode *inode, int cp_reason, int datasync, int ret),

- TP_ARGS(inode, need_cp, datasync, ret),
+ TP_ARGS(inode, cp_reason, datasync, ret),

TP_STRUCT__entry(
__field(dev_t, dev)
__field(ino_t, ino)
- __field(int, need_cp)
+ __field(int, cp_reason)
__field(int, datasync)
__field(int, ret)
),
@@ -225,15 +225,15 @@ TRACE_EVENT(f2fs_sync_file_exit,
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
- __entry->need_cp = need_cp;
+ __entry->cp_reason = cp_reason;
__entry->datasync = datasync;
__entry->ret = ret;
),

- TP_printk("dev = (%d,%d), ino = %lu, checkpoint is %s, "
+ TP_printk("dev = (%d,%d), ino = %lu, cp_reason:%d, "
"datasync = %d, ret = %d",
show_dev_ino(__entry),
- __entry->need_cp ? "needed" : "not needed",
+ __entry->cp_reason,
__entry->datasync,
__entry->ret)
);
--
2.14.1.145.gb3622a4ee
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