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Subject[PATCH 1/2] f2fs: pass down write hints to block layer for bufferd write
Date
From: Hyunchul Lee <cheol.lee@lge.com>

This implements which hint is passed down to block layer
for datas from the specific segment type.

segment type hints
------------ -----
COLD_NODE & COLD_DATA WRITE_LIFE_EXTREME
WARM_DATA WRITE_LIFE_NONE
HOT_NODE & WARM_NODE WRITE_LIFE_LONG
HOT_DATA WRITE_LIFE_MEDIUM
META_DATA WRITE_LIFE_SHORT

Many thanks to Chao Yu and Jaegeuk Kim for comments to
implement this patch.

Signed-off-by: Hyunchul Lee <cheol.lee@lge.com>
---
fs/f2fs/data.c | 1 +
fs/f2fs/f2fs.h | 2 ++
fs/f2fs/segment.c | 29 +++++++++++++++++++++++++++++
fs/f2fs/super.c | 2 ++
4 files changed, 34 insertions(+)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index a7ae418..0919a43 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -437,6 +437,7 @@ int f2fs_submit_page_write(struct f2fs_io_info *fio)
}
io->bio = __bio_alloc(sbi, fio->new_blkaddr,
BIO_MAX_PAGES, false);
+ io->bio->bi_write_hint = io->write_hint;
io->fio = *fio;
}

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 7bcd148..be3cb0c 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -969,6 +969,7 @@ struct f2fs_bio_info {
struct rw_semaphore io_rwsem; /* blocking op for bio */
spinlock_t io_lock; /* serialize DATA/NODE IOs */
struct list_head io_list; /* track fios */
+ enum rw_hint write_hint;
};

#define FDEV(i) (sbi->devs[i])
@@ -2674,6 +2675,7 @@ int lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
int __init create_segment_manager_caches(void);
void destroy_segment_manager_caches(void);
int rw_hint_to_seg_type(enum rw_hint hint);
+enum rw_hint io_type_to_rw_hint(enum page_type page, enum temp_type temp);

/*
* checkpoint.c
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index c117e09..0570db7 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2446,6 +2446,35 @@ int rw_hint_to_seg_type(enum rw_hint hint)
}
}

+enum rw_hint io_type_to_rw_hint(enum page_type page, enum temp_type temp)
+{
+ if (page == DATA) {
+ switch (temp) {
+ case WARM:
+ return WRITE_LIFE_NONE;
+ case COLD:
+ return WRITE_LIFE_EXTREME;
+ case HOT:
+ return WRITE_LIFE_MEDIUM;
+ default:
+ return WRITE_LIFE_NOT_SET;
+ }
+ } else if (page == NODE) {
+ switch (temp) {
+ case WARM:
+ case HOT:
+ return WRITE_LIFE_LONG;
+ case COLD:
+ return WRITE_LIFE_EXTREME;
+ default:
+ return WRITE_LIFE_NOT_SET;
+ }
+
+ } else {
+ return WRITE_LIFE_SHORT;
+ }
+}
+
static int __get_segment_type_2(struct f2fs_io_info *fio)
{
if (fio->type == DATA)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index a6c5dd4..51c19a0 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2508,6 +2508,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
sbi->write_io[i][j].bio = NULL;
spin_lock_init(&sbi->write_io[i][j].io_lock);
INIT_LIST_HEAD(&sbi->write_io[i][j].io_list);
+ sbi->write_io[i][j].write_hint =
+ io_type_to_rw_hint(i, j);
}
}

--
1.9.1
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