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Subject[PATCH] f2fs: introduce sysfs/data_io_flag to attach REQ_META/FUA
Date
This patch introduces a way to attach REQ_META/FUA explicitly
to all the data writes given temperature.

-> attach REQ_FUA to Hot Data writes

-> attach REQ_FUA to Hot|Warm Data writes

-> attach REQ_FUA to Hot|Warm|Cold Data writes

-> attach REQ_FUA to Hot|Warm|Cold Data writes as well as
REQ_META to Hot Data writes

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
Documentation/ABI/testing/sysfs-fs-f2fs | 9 +++++++++
fs/f2fs/data.c | 23 +++++++++++++++++++++++
fs/f2fs/f2fs.h | 3 +++
fs/f2fs/sysfs.c | 3 ++-
4 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index bd8a0d19abe67..c8620ea7022a7 100644
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -323,3 +323,12 @@ What: /sys/fs/f2fs/<disk>/mounted_time_sec
Date: February 2020
Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
Description: Show the mounted time in secs of this partition.
+
+What: /sys/fs/f2fs/<disk>/data_io_flag
+Date: April 2020
+Contact: "Jaegeuk Kim" <jaegeuk@kernel.org>
+Description: Give a way to attach REQ_META|FUA to data writes
+ given temperature-based bits. Now the bits indicate:
+ * REQ_META | REQ_FUA |
+ * 5 | 4 | 3 | 2 | 1 | 0 |
+ * Cold | Warm | Hot | Cold | Warm | Hot |
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 0a829a89f596f..358c5f0bd6346 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -513,6 +513,28 @@ void f2fs_submit_bio(struct f2fs_sb_info *sbi,
__submit_bio(sbi, bio, type);
}

+static void __attach_data_io_flag(struct f2fs_io_info *fio)
+{
+ struct f2fs_sb_info *sbi = fio->sbi;
+ unsigned int temp_mask = (1 << NR_TEMP_TYPE) - 1;
+ unsigned int fua_flag = sbi->data_io_flag & temp_mask;
+ unsigned int meta_flag = (sbi->data_io_flag >> NR_TEMP_TYPE) &
+ temp_mask;
+ /*
+ * data io flag bits per temp:
+ * REQ_META | REQ_FUA |
+ * 5 | 4 | 3 | 2 | 1 | 0 |
+ * Cold | Warm | Hot | Cold | Warm | Hot |
+ */
+ if (fio->type != DATA)
+ return;
+
+ if ((1 << fio->temp) & meta_flag)
+ fio->op_flags |= REQ_META;
+ if ((1 << fio->temp) & fua_flag)
+ fio->op_flags |= REQ_FUA;
+}
+
static void __submit_merged_bio(struct f2fs_bio_info *io)
{
struct f2fs_io_info *fio = &io->fio;
@@ -520,6 +542,7 @@ static void __submit_merged_bio(struct f2fs_bio_info *io)
if (!io->bio)
return;

+ __attach_data_io_flag(fio);
bio_set_op_attrs(io->bio, fio->op, fio->op_flags);

if (is_read_io(fio->op))
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index da069d051982f..be02a5cadd944 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1510,6 +1510,9 @@ struct f2fs_sb_info {
unsigned long long write_iostat[NR_IO_TYPE];
bool iostat_enable;

+ /* to attach REQ_META|REQ_FUA flags */
+ unsigned int data_io_flag;
+
/* For sysfs suppport */
struct kobject s_kobj;
struct completion s_kobj_unregister;
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index cb81680d18f7e..d58935eed2cf7 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -373,7 +373,6 @@ static ssize_t __sbi_store(struct f2fs_attr *a,
return count;
}

-
if (!strcmp(a->attr.name, "iostat_enable")) {
sbi->iostat_enable = !!t;
if (!sbi->iostat_enable)
@@ -544,6 +543,7 @@ F2FS_RW_ATTR(F2FS_SBI, f2fs_super_block, extension_list, extension_list);
F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
#endif
+F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, data_io_flag, data_io_flag);
F2FS_GENERAL_RO_ATTR(dirty_segments);
F2FS_GENERAL_RO_ATTR(free_segments);
F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
@@ -623,6 +623,7 @@ static struct attribute *f2fs_attrs[] = {
ATTR_LIST(inject_rate),
ATTR_LIST(inject_type),
#endif
+ ATTR_LIST(data_io_flag),
ATTR_LIST(dirty_segments),
ATTR_LIST(free_segments),
ATTR_LIST(unusable),
--
2.26.0.292.g33ef6b2f38-goog
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