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Subject[PATCH 1/3] f2fs: support passing down write hints given by users to block layer
Date
From: Hyunchul Lee <cheol.lee@lge.com>

Add the 'whint_mode' mount option that controls which write
hints are passed down to block layer. There are "off" and
"user-based" mode. The default mode is "off".

1) whint_mode=user-based. F2FS tries to pass down hints given
by users.

User F2FS Block
---- ---- -----
META WRITE_LIFE_NOT_SET
HOT_NODE "
WARM_NODE "
COLD_NODE "
ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME
extension list " "

-- buffered 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_MEDIUM " "
WRITE_LIFE_LONG " "

-- 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

2) whint_mode=off. F2FS only passes down WRITE_LIFE_NOT_SET.

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 | 27 ++++++++++++++++++++-----
fs/f2fs/f2fs.h | 9 +++++++++
fs/f2fs/segment.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/f2fs/super.c | 24 +++++++++++++++++++++-
4 files changed, 113 insertions(+), 6 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 6cba74e..c76ddc2 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -175,15 +175,22 @@ static bool __same_bdev(struct f2fs_sb_info *sbi,
*/
static struct bio *__bio_alloc(struct f2fs_sb_info *sbi, block_t blk_addr,
struct writeback_control *wbc,
- int npages, bool is_read)
+ int npages, bool is_read,
+ enum page_type type, enum temp_type temp)
{
struct bio *bio;

bio = f2fs_bio_alloc(sbi, npages, true);

f2fs_target_device(sbi, blk_addr, bio);
- bio->bi_end_io = is_read ? f2fs_read_end_io : f2fs_write_end_io;
- bio->bi_private = is_read ? NULL : sbi;
+ if (is_read) {
+ bio->bi_end_io = f2fs_read_end_io;
+ bio->bi_private = NULL;
+ } else {
+ bio->bi_end_io = f2fs_write_end_io;
+ bio->bi_private = sbi;
+ bio->bi_write_hint = io_type_to_rw_hint(sbi, type, temp);
+ }
if (wbc)
wbc_init_bio(wbc, bio);

@@ -382,7 +389,7 @@ int f2fs_submit_page_bio(struct f2fs_io_info *fio)

/* Allocate a new bio */
bio = __bio_alloc(fio->sbi, fio->new_blkaddr, fio->io_wbc,
- 1, is_read_io(fio->op));
+ 1, is_read_io(fio->op), fio->type, fio->temp);

if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
bio_put(bio);
@@ -445,7 +452,8 @@ int f2fs_submit_page_write(struct f2fs_io_info *fio)
goto out_fail;
}
io->bio = __bio_alloc(sbi, fio->new_blkaddr, fio->io_wbc,
- BIO_MAX_PAGES, false);
+ BIO_MAX_PAGES, false,
+ fio->type, fio->temp);
io->fio = *fio;
}

@@ -2287,10 +2295,12 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
struct address_space *mapping = iocb->ki_filp->f_mapping;
struct inode *inode = mapping->host;
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
size_t count = iov_iter_count(iter);
loff_t offset = iocb->ki_pos;
int rw = iov_iter_rw(iter);
int err;
+ enum rw_hint hint;

err = check_direct_IO(inode, iter, offset);
if (err)
@@ -2301,11 +2311,18 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)

trace_f2fs_direct_IO_enter(inode, offset, count, rw);

+ if (rw == WRITE && sbi->whint_mode == WHINT_MODE_OFF) {
+ hint = iocb->ki_hint;
+ iocb->ki_hint = WRITE_LIFE_NOT_SET;
+ }
+
down_read(&F2FS_I(inode)->dio_rwsem[rw]);
err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio);
up_read(&F2FS_I(inode)->dio_rwsem[rw]);

if (rw == WRITE) {
+ if (sbi->whint_mode == WHINT_MODE_OFF)
+ iocb->ki_hint = hint;
if (err > 0) {
f2fs_update_iostat(F2FS_I_SB(inode), APP_DIRECT_IO,
err);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index b7ba496..d7c2797 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1035,6 +1035,11 @@ enum {
MAX_TIME,
};

+enum {
+ WHINT_MODE_OFF, /* not pass down write hints */
+ WHINT_MODE_USER, /* try to pass down hints given by users */
+};
+
struct f2fs_sb_info {
struct super_block *sb; /* pointer to VFS super block */
struct proc_dir_entry *s_proc; /* proc entry */
@@ -1218,6 +1223,8 @@ struct f2fs_sb_info {
char *s_qf_names[MAXQUOTAS];
int s_jquota_fmt; /* Format of quota to use */
#endif
+ /* For which write hints are passed down to block layer */
+ int whint_mode;
};

#ifdef CONFIG_F2FS_FAULT_INJECTION
@@ -2766,6 +2773,8 @@ 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(struct f2fs_sb_info *sbi, enum page_type type,
+ enum temp_type temp);

/*
* checkpoint.c
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index e5739ce..8bc1fc1 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2458,6 +2458,62 @@ int 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. There are 2 mapping tables which depend on
+ * the mount option 'whint'.
+ *
+ * 1) whint_mode=user-based. F2FS tries to pass down hints given by users.
+ *
+ * User F2FS Block
+ * ---- ---- -----
+ * META WRITE_LIFE_NOT_SET
+ * HOT_NODE "
+ * WARM_NODE "
+ * COLD_NODE "
+ * ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME
+ * extension list " "
+ *
+ * -- buffered 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_MEDIUM " "
+ * WRITE_LIFE_LONG " "
+ *
+ * -- 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
+ *
+ * 2) whint_mode=off. F2FS only passes down WRITE_LIFE_NOT_SET.
+ *
+ */
+
+enum rw_hint io_type_to_rw_hint(struct f2fs_sb_info *sbi,
+ enum page_type type, enum temp_type temp)
+{
+ if (sbi->whint_mode == WHINT_MODE_USER) {
+ if (type == DATA) {
+ switch (temp) {
+ case COLD:
+ return WRITE_LIFE_EXTREME;
+ case HOT:
+ return WRITE_LIFE_SHORT;
+ default:
+ return WRITE_LIFE_NOT_SET;
+ }
+ } else {
+ return WRITE_LIFE_NOT_SET;
+ }
+ } else {
+ return WRITE_LIFE_NOT_SET;
+ }
+}
+
static int __get_segment_type_2(struct f2fs_io_info *fio)
{
if (fio->type == DATA)
@@ -2645,6 +2701,7 @@ void write_meta_page(struct f2fs_sb_info *sbi, struct page *page,
struct f2fs_io_info fio = {
.sbi = sbi,
.type = META,
+ .temp = HOT,
.op = REQ_OP_WRITE,
.op_flags = REQ_SYNC | REQ_META | REQ_PRIO,
.old_blkaddr = page->index,
@@ -2693,6 +2750,8 @@ int rewrite_data_page(struct f2fs_io_info *fio)
int err;

fio->new_blkaddr = fio->old_blkaddr;
+ /* i/o temperature is needed for passing down write hints */
+ __get_segment_type(fio);
stat_inc_inplace_blocks(fio->sbi);

err = f2fs_submit_page_bio(fio);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 8173ae6..9e22926 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -129,6 +129,7 @@ enum {
Opt_jqfmt_vfsold,
Opt_jqfmt_vfsv0,
Opt_jqfmt_vfsv1,
+ Opt_whint,
Opt_err,
};

@@ -182,6 +183,7 @@ enum {
{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
+ {Opt_whint, "whint_mode=%s"},
{Opt_err, NULL},
};

@@ -679,6 +681,22 @@ static int parse_options(struct super_block *sb, char *options)
"quota operations not supported");
break;
#endif
+ case Opt_whint:
+ name = match_strdup(&args[0]);
+ if (!name)
+ return -ENOMEM;
+ if (strlen(name) == 10 &&
+ !strncmp(name, "user-based", 10)) {
+ sbi->whint_mode = WHINT_MODE_USER;
+ } else if (strlen(name) == 3 &&
+ !strncmp(name, "off", 3)) {
+ sbi->whint_mode = WHINT_MODE_OFF;
+ } else {
+ kfree(name);
+ return -EINVAL;
+ }
+ kfree(name);
+ break;
default:
f2fs_msg(sb, KERN_ERR,
"Unrecognized mount option \"%s\" or missing value",
@@ -1225,6 +1243,8 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
seq_puts(seq, ",prjquota");
#endif
f2fs_show_quota_options(seq, sbi->sb);
+ if (sbi->whint_mode == WHINT_MODE_USER)
+ seq_printf(seq, ",whint_mode=%s", "user-based");

return 0;
}
@@ -1234,6 +1254,7 @@ static void default_options(struct f2fs_sb_info *sbi)
/* init some FS parameters */
sbi->active_logs = NR_CURSEG_TYPE;
sbi->inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
+ sbi->whint_mode = WHINT_MODE_OFF;

set_opt(sbi, BG_GC);
set_opt(sbi, INLINE_XATTR);
@@ -1274,6 +1295,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
bool need_restart_gc = false;
bool need_stop_gc = false;
bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
+ int old_whint_mode = sbi->whint_mode;
#ifdef CONFIG_F2FS_FAULT_INJECTION
struct f2fs_fault_info ffi = sbi->fault_info;
#endif
@@ -1373,7 +1395,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
need_stop_gc = true;
}

- if (*flags & SB_RDONLY) {
+ if (*flags & SB_RDONLY || sbi->whint_mode != old_whint_mode) {
writeback_inodes_sb(sb, WB_REASON_SYNC);
sync_inodes_sb(sb);

--
1.9.1
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