[PATCH 0/2] f2fs: Fix DIO flags and add ioprio hint

[PATCH 0/2] f2fs: Fix DIO flags and add ioprio hint

[Daniel Lee]

The first patch corrects an issue where Direct I/O (DIO) writes ignore
bio flag hints (e.g., F2FS_IOPRIO_WRITE for REQ_PRIO),
making them inconsistent with buffered I/O.

The second patch is to set an I/O priority hint for hot files on creation
and pinned files by default.

Daniel Lee (2):
  f2fs: Apply bio flags to direct I/O
  f2fs: use ioprio hint for hot and pinned files

 fs/f2fs/data.c  |  8 ++++----
 fs/f2fs/f2fs.h  | 23 +++++++++++++++++++++++
 fs/f2fs/file.c  | 15 +++++++++++++++
 fs/f2fs/namei.c | 11 +++++++----
 4 files changed, 49 insertions(+), 8 deletions(-)

-- 
2.50.0.rc1.591.g9c95f17f64-goog

[PATCH 1/2] f2fs: Apply bio flags to direct I/O

[Daniel Lee]

Bio flags like REQ_PRIO, REQ_META, and REQ_FUA, determined by
f2fs_io_flags(), were not being applied to direct I/O (DIO) writes.
This meant that DIO writes would not respect filesystem-level hints
(for REQ_META/FUA) or inode-level hints (like F2FS_IOPRIO_WRITE).

This patch refactors f2fs_io_flags() to use a direct inode pointer
instead of deriving it from a page. The function is then called from
the DIO write path, ensuring that bio flags are handled consistently
for both buffered and DIO writes.

Signed-off-by: Daniel Lee <chullee@google.com>
---
 fs/f2fs/data.c |  8 ++++----
 fs/f2fs/f2fs.h |  2 ++
 fs/f2fs/file.c | 12 ++++++++++++
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 31e892842625..966cea75874c 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -416,10 +416,9 @@ int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
 	return 0;
 }
 
-static blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio)
+blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio)
 {
 	unsigned int temp_mask = GENMASK(NR_TEMP_TYPE - 1, 0);
-	struct folio *fio_folio = page_folio(fio->page);
 	unsigned int fua_flag, meta_flag, io_flag;
 	blk_opf_t op_flags = 0;
 
@@ -446,8 +445,8 @@ static blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio)
 	if (BIT(fio->temp) & fua_flag)
 		op_flags |= REQ_FUA;
 
-	if (fio->type == DATA &&
-	    F2FS_I(fio_folio->mapping->host)->ioprio_hint == F2FS_IOPRIO_WRITE)
+	if (fio->inode && fio->type == DATA &&
+	    F2FS_I(fio->inode)->ioprio_hint == F2FS_IOPRIO_WRITE)
 		op_flags |= REQ_PRIO;
 
 	return op_flags;
@@ -2783,6 +2782,7 @@ int f2fs_write_single_data_page(struct folio *folio, int *submitted,
 	int err = 0;
 	struct f2fs_io_info fio = {
 		.sbi = sbi,
+		.inode = inode,
 		.ino = inode->i_ino,
 		.type = DATA,
 		.op = REQ_OP_WRITE,
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9333a22b9a01..162d79a3c1a5 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1233,6 +1233,7 @@ enum iostat_type {
 
 struct f2fs_io_info {
 	struct f2fs_sb_info *sbi;	/* f2fs_sb_info pointer */
+	struct inode *inode;
 	nid_t ino;		/* inode number */
 	enum page_type type;	/* contains DATA/NODE/META/META_FLUSH */
 	enum temp_type temp;	/* contains HOT/WARM/COLD */
@@ -3972,6 +3973,7 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio);
 struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
 		block_t blk_addr, sector_t *sector);
 int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr);
+blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio);
 void f2fs_set_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr);
 void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr);
 int f2fs_reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 696131e655ed..4fd45e94661a 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -5015,6 +5015,18 @@ static void f2fs_dio_write_submit_io(const struct iomap_iter *iter,
 	enum log_type type = f2fs_rw_hint_to_seg_type(sbi, inode->i_write_hint);
 	enum temp_type temp = f2fs_get_segment_temp(sbi, type);
 
+	/* if fadvise set to hot, override the temperature */
+	struct f2fs_io_info fio = {
+		.sbi = sbi,
+		.inode = inode,
+		.type = DATA,
+		.op = REQ_OP_WRITE,
+		.temp = file_is_hot(inode) ? HOT : temp,
+		.op_flags = bio->bi_opf,
+		.page = NULL,
+	};
+	bio->bi_opf |= f2fs_io_flags(&fio);
+
 	bio->bi_write_hint = f2fs_io_type_to_rw_hint(sbi, DATA, temp);
 	submit_bio(bio);
 }
-- 
2.50.0.rc1.591.g9c95f17f64-goog

Re: [PATCH 1/2] f2fs: Apply bio flags to direct I/O

[Chao Yu]

On 2025/6/12 7:37, Daniel Lee wrote:
> Bio flags like REQ_PRIO, REQ_META, and REQ_FUA, determined by
> f2fs_io_flags(), were not being applied to direct I/O (DIO) writes.
> This meant that DIO writes would not respect filesystem-level hints
> (for REQ_META/FUA) or inode-level hints (like F2FS_IOPRIO_WRITE).
> 
> This patch refactors f2fs_io_flags() to use a direct inode pointer
> instead of deriving it from a page. The function is then called from
> the DIO write path, ensuring that bio flags are handled consistently
> for both buffered and DIO writes.
> 
> Signed-off-by: Daniel Lee <chullee@google.com>
> ---
>   fs/f2fs/data.c |  8 ++++----
>   fs/f2fs/f2fs.h |  2 ++
>   fs/f2fs/file.c | 12 ++++++++++++
>   3 files changed, 18 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 31e892842625..966cea75874c 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -416,10 +416,9 @@ int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr)
>   	return 0;
>   }
>   
> -static blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio)
> +blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio)
>   {
>   	unsigned int temp_mask = GENMASK(NR_TEMP_TYPE - 1, 0);
> -	struct folio *fio_folio = page_folio(fio->page);
>   	unsigned int fua_flag, meta_flag, io_flag;
>   	blk_opf_t op_flags = 0;
>   
> @@ -446,8 +445,8 @@ static blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio)
>   	if (BIT(fio->temp) & fua_flag)
>   		op_flags |= REQ_FUA;
>   
> -	if (fio->type == DATA &&
> -	    F2FS_I(fio_folio->mapping->host)->ioprio_hint == F2FS_IOPRIO_WRITE)
> +	if (fio->inode && fio->type == DATA &&

It seems that it changes the logic, if fio->inode is NULL we will not tag
op_flags w/ REQ_PRIO, path like GC? do we need to assign fio.inode for all
paths?

Thanks,

> +	    F2FS_I(fio->inode)->ioprio_hint == F2FS_IOPRIO_WRITE)
>   		op_flags |= REQ_PRIO;
>   
>   	return op_flags;
> @@ -2783,6 +2782,7 @@ int f2fs_write_single_data_page(struct folio *folio, int *submitted,
>   	int err = 0;
>   	struct f2fs_io_info fio = {
>   		.sbi = sbi,
> +		.inode = inode,
>   		.ino = inode->i_ino,
>   		.type = DATA,
>   		.op = REQ_OP_WRITE,
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 9333a22b9a01..162d79a3c1a5 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -1233,6 +1233,7 @@ enum iostat_type {
>   
>   struct f2fs_io_info {
>   	struct f2fs_sb_info *sbi;	/* f2fs_sb_info pointer */
> +	struct inode *inode;
>   	nid_t ino;		/* inode number */
>   	enum page_type type;	/* contains DATA/NODE/META/META_FLUSH */
>   	enum temp_type temp;	/* contains HOT/WARM/COLD */
> @@ -3972,6 +3973,7 @@ void f2fs_submit_page_write(struct f2fs_io_info *fio);
>   struct block_device *f2fs_target_device(struct f2fs_sb_info *sbi,
>   		block_t blk_addr, sector_t *sector);
>   int f2fs_target_device_index(struct f2fs_sb_info *sbi, block_t blkaddr);
> +blk_opf_t f2fs_io_flags(struct f2fs_io_info *fio);
>   void f2fs_set_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr);
>   void f2fs_update_data_blkaddr(struct dnode_of_data *dn, block_t blkaddr);
>   int f2fs_reserve_new_blocks(struct dnode_of_data *dn, blkcnt_t count);
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 696131e655ed..4fd45e94661a 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -5015,6 +5015,18 @@ static void f2fs_dio_write_submit_io(const struct iomap_iter *iter,
>   	enum log_type type = f2fs_rw_hint_to_seg_type(sbi, inode->i_write_hint);
>   	enum temp_type temp = f2fs_get_segment_temp(sbi, type);
>   
> +	/* if fadvise set to hot, override the temperature */
> +	struct f2fs_io_info fio = {
> +		.sbi = sbi,
> +		.inode = inode,
> +		.type = DATA,
> +		.op = REQ_OP_WRITE,
> +		.temp = file_is_hot(inode) ? HOT : temp,
> +		.op_flags = bio->bi_opf,
> +		.page = NULL,
> +	};
> +	bio->bi_opf |= f2fs_io_flags(&fio);
> +
>   	bio->bi_write_hint = f2fs_io_type_to_rw_hint(sbi, DATA, temp);
>   	submit_bio(bio);
>   }

[PATCH 2/2] f2fs: use ioprio hint for hot and pinned files

[Daniel Lee]

Apply the `ioprio_hint` to set `F2FS_IOPRIO_WRITE` priority
on files identified as "hot" at creation and on files that are
pinned via ioctl.

Signed-off-by: Daniel Lee <chullee@google.com>
---
 fs/f2fs/f2fs.h  | 21 +++++++++++++++++++++
 fs/f2fs/file.c  |  3 +++
 fs/f2fs/namei.c | 11 +++++++----
 3 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 162d79a3c1a5..0b05b3b6386b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3441,6 +3441,27 @@ static inline void set_file(struct inode *inode, int type)
 	f2fs_mark_inode_dirty_sync(inode, true);
 }
 
+static inline int get_ioprio(struct inode *inode)
+{
+	return F2FS_I(inode)->ioprio_hint;
+}
+
+static inline void set_ioprio(struct inode *inode, int level)
+{
+	if (get_ioprio(inode) == level)
+		return;
+	F2FS_I(inode)->ioprio_hint = level;
+	f2fs_mark_inode_dirty_sync(inode, true);
+}
+
+static inline void clear_ioprio(struct inode *inode)
+{
+	if (get_ioprio(inode) == 0)
+		return;
+	F2FS_I(inode)->ioprio_hint = 0;
+	f2fs_mark_inode_dirty_sync(inode, true);
+}
+
 static inline void clear_file(struct inode *inode, int type)
 {
 	if (!is_file(inode, type))
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 4fd45e94661a..95a3b4b59dd1 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3496,6 +3496,7 @@ static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
 
 	if (!pin) {
 		clear_inode_flag(inode, FI_PIN_FILE);
+		clear_ioprio(inode);
 		f2fs_i_gc_failures_write(inode, 0);
 		goto done;
 	} else if (f2fs_is_pinned_file(inode)) {
@@ -3529,6 +3530,8 @@ static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
 	}
 
 	set_inode_flag(inode, FI_PIN_FILE);
+	file_set_hot(inode);
+	set_ioprio(inode, F2FS_IOPRIO_WRITE);
 	ret = F2FS_I(inode)->i_gc_failures;
 done:
 	f2fs_update_time(sbi, REQ_TIME);
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 07e333ee21b7..0f96a0b86c40 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -191,9 +191,10 @@ static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir,
 }
 
 /*
- * Set file's temperature for hot/cold data separation
+ * Set file's temperature (for hot/cold data separation) and
+ * I/O priority, based on filename extension
  */
-static void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
+static void set_file_temp_prio(struct f2fs_sb_info *sbi, struct inode *inode,
 		const unsigned char *name)
 {
 	__u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
@@ -212,8 +213,10 @@ static void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 
 	if (i < cold_count)
 		file_set_cold(inode);
-	else
+	else {
 		file_set_hot(inode);
+		set_ioprio(inode, F2FS_IOPRIO_WRITE);
+	}
 }
 
 static struct inode *f2fs_new_inode(struct mnt_idmap *idmap,
@@ -317,7 +320,7 @@ static struct inode *f2fs_new_inode(struct mnt_idmap *idmap,
 		set_inode_flag(inode, FI_INLINE_DATA);
 
 	if (name && !test_opt(sbi, DISABLE_EXT_IDENTIFY))
-		set_file_temperature(sbi, inode, name);
+		set_file_temp_prio(sbi, inode, name);
 
 	stat_inc_inline_xattr(inode);
 	stat_inc_inline_inode(inode);
-- 
2.50.0.rc1.591.g9c95f17f64-goog

Re: [PATCH 2/2] f2fs: use ioprio hint for hot and pinned files

[Chao Yu]

On 2025/6/12 7:37, Daniel Lee wrote:
> Apply the `ioprio_hint` to set `F2FS_IOPRIO_WRITE` priority
> on files identified as "hot" at creation and on files that are
> pinned via ioctl.
> 
> Signed-off-by: Daniel Lee <chullee@google.com>
> ---
>   fs/f2fs/f2fs.h  | 21 +++++++++++++++++++++
>   fs/f2fs/file.c  |  3 +++
>   fs/f2fs/namei.c | 11 +++++++----
>   3 files changed, 31 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 162d79a3c1a5..0b05b3b6386b 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3441,6 +3441,27 @@ static inline void set_file(struct inode *inode, int type)
>   	f2fs_mark_inode_dirty_sync(inode, true);
>   }
>   
> +static inline int get_ioprio(struct inode *inode)
> +{
> +	return F2FS_I(inode)->ioprio_hint;
> +}
> +
> +static inline void set_ioprio(struct inode *inode, int level)
> +{
> +	if (get_ioprio(inode) == level)
> +		return;
> +	F2FS_I(inode)->ioprio_hint = level;
> +	f2fs_mark_inode_dirty_sync(inode, true);

We don't need to mark inode dirty? IIRC, .ioprio_hint is just in-memory variable?

> +}
> +
> +static inline void clear_ioprio(struct inode *inode)
> +{
> +	if (get_ioprio(inode) == 0)
> +		return;
> +	F2FS_I(inode)->ioprio_hint = 0;
> +	f2fs_mark_inode_dirty_sync(inode, true);

Ditto,

> +}
> +
>   static inline void clear_file(struct inode *inode, int type)
>   {
>   	if (!is_file(inode, type))
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index 4fd45e94661a..95a3b4b59dd1 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -3496,6 +3496,7 @@ static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
>   
>   	if (!pin) {
>   		clear_inode_flag(inode, FI_PIN_FILE);
> +		clear_ioprio(inode);
>   		f2fs_i_gc_failures_write(inode, 0);
>   		goto done;
>   	} else if (f2fs_is_pinned_file(inode)) {
> @@ -3529,6 +3530,8 @@ static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
>   	}
>   
>   	set_inode_flag(inode, FI_PIN_FILE);
> +	file_set_hot(inode);
> +	set_ioprio(inode, F2FS_IOPRIO_WRITE);
>   	ret = F2FS_I(inode)->i_gc_failures;
>   done:
>   	f2fs_update_time(sbi, REQ_TIME);
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index 07e333ee21b7..0f96a0b86c40 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -191,9 +191,10 @@ static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir,
>   }
>   
>   /*
> - * Set file's temperature for hot/cold data separation
> + * Set file's temperature (for hot/cold data separation) and
> + * I/O priority, based on filename extension
>    */
> -static void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
> +static void set_file_temp_prio(struct f2fs_sb_info *sbi, struct inode *inode,
>   		const unsigned char *name)
>   {
>   	__u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
> @@ -212,8 +213,10 @@ static void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
>   
>   	if (i < cold_count)
>   		file_set_cold(inode);
> -	else
> +	else {
>   		file_set_hot(inode);
> +		set_ioprio(inode, F2FS_IOPRIO_WRITE);
> +	}
>   }
>   
>   static struct inode *f2fs_new_inode(struct mnt_idmap *idmap,
> @@ -317,7 +320,7 @@ static struct inode *f2fs_new_inode(struct mnt_idmap *idmap,
>   		set_inode_flag(inode, FI_INLINE_DATA);
>   
>   	if (name && !test_opt(sbi, DISABLE_EXT_IDENTIFY))
> -		set_file_temperature(sbi, inode, name);
> +		set_file_temp_prio(sbi, inode, name);
>   
>   	stat_inc_inline_xattr(inode);
>   	stat_inc_inline_inode(inode);