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Date: Wed, 17 Apr 2024 21:12:01 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Cc: Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH] f2fs: assign the write hint per stream by default
This reverts commit 930e2607638d ("f2fs: remove obsolete whint_mode"), as we
decide to pass write hints to the disk.
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
Documentation/filesystems/f2fs.rst | 29 +++++++++++++++
fs/f2fs/data.c | 2 +
fs/f2fs/f2fs.h | 2 +
fs/f2fs/segment.c | 59 ++++++++++++++++++++++++++++++
4 files changed, 92 insertions(+)
diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
index efc3493fd6f8..68a0885fb5e6 100644
--- a/Documentation/filesystems/f2fs.rst
+++ b/Documentation/filesystems/f2fs.rst
@@ -774,6 +774,35 @@ In order to identify whether the data in the victim segment are valid or not,
F2FS manages a bitmap. Each bit represents the validity of a block, and the
bitmap is composed of a bit stream covering whole blocks in main area.
+Write-hint Policy
+-----------------
+
+F2FS sets the whint all the time with the below policy.
+
+===================== ======================== ===================
+User F2FS Block
+===================== ======================== ===================
+N/A META WRITE_LIFE_NONE|REQ_META
+N/A HOT_NODE WRITE_LIFE_NONE
+N/A WARM_NODE WRITE_LIFE_MEDIUM
+N/A COLD_NODE WRITE_LIFE_LONG
+ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME
+extension list " "
+
+-- buffered io
+N/A COLD_DATA WRITE_LIFE_EXTREME
+N/A HOT_DATA WRITE_LIFE_SHORT
+N/A WARM_DATA WRITE_LIFE_NOT_SET
+
+-- direct io
+WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
+WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
+WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET
+WRITE_LIFE_NONE " WRITE_LIFE_NONE
+WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM
+WRITE_LIFE_LONG " WRITE_LIFE_LONG
+===================== ======================== ===================
+
Fallocate(2) Policy
-------------------
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 5d641fac02ba..ed7d08785fcf 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -465,6 +465,8 @@ static struct bio *__bio_alloc(struct f2fs_io_info *fio, int npages)
} else {
bio->bi_end_io = f2fs_write_end_io;
bio->bi_private = sbi;
+ bio->bi_write_hint = f2fs_io_type_to_rw_hint(sbi,
+ fio->type, fio->temp);
}
iostat_alloc_and_bind_ctx(sbi, bio, NULL);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index dd530dc70005..b3b878acc86b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3745,6 +3745,8 @@ void f2fs_destroy_segment_manager(struct f2fs_sb_info *sbi);
int __init f2fs_create_segment_manager_caches(void);
void f2fs_destroy_segment_manager_caches(void);
int f2fs_rw_hint_to_seg_type(enum rw_hint hint);
+enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi,
+ enum page_type type, enum temp_type temp);
unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi,
unsigned int segno);
unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index f0da516ba8dc..daa94669f7ee 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3364,6 +3364,65 @@ int f2fs_rw_hint_to_seg_type(enum rw_hint hint)
}
}
+/*
+ * This returns write hints for each segment type. This hints will be
+ * passed down to block layer as below by default.
+ *
+ * User F2FS Block
+ * ---- ---- -----
+ * META WRITE_LIFE_NONE|REQ_META
+ * HOT_NODE WRITE_LIFE_NONE
+ * WARM_NODE WRITE_LIFE_MEDIUM
+ * COLD_NODE WRITE_LIFE_LONG
+ * ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME
+ * extension list " "
+ *
+ * -- buffered io
+ * COLD_DATA WRITE_LIFE_EXTREME
+ * HOT_DATA WRITE_LIFE_SHORT
+ * WARM_DATA WRITE_LIFE_NOT_SET
+ *
+ * -- direct io
+ * WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
+ * WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
+ * WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET
+ * WRITE_LIFE_NONE " WRITE_LIFE_NONE
+ * WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM
+ * WRITE_LIFE_LONG " WRITE_LIFE_LONG
+ */
+enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi,
+ enum page_type type, enum temp_type temp)
+{
+ switch (type) {
+ case DATA:
+ switch (temp) {
+ case WARM:
+ return WRITE_LIFE_NOT_SET;
+ case HOT:
+ return WRITE_LIFE_SHORT;
+ case COLD:
+ return WRITE_LIFE_EXTREME;
+ default:
+ return WRITE_LIFE_NONE;
+ }
+ case NODE:
+ switch (temp) {
+ case WARM:
+ return WRITE_LIFE_MEDIUM;
+ case HOT:
+ return WRITE_LIFE_NONE;
+ case COLD:
+ return WRITE_LIFE_LONG;
+ default:
+ return WRITE_LIFE_NONE;
+ }
+ case META:
+ return WRITE_LIFE_NONE;
+ default:
+ return WRITE_LIFE_NONE;
+ }
+}
+
static int __get_segment_type_2(struct f2fs_io_info *fio)
{
if (fio->type == DATA)
--
2.44.0.683.g7961c838ac-goog
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