If two readahead threads having same offset enter in readpages, every read
IOs are split and issued to the disk which giving lower bandwidth.
This patch tries to avoid redundant readahead calls.
Signed-off-by: Jaegeuk Kim <[email protected]>
---
v3:
- use READ|WRITE_ONCE
v2:
- add missing code to bypass read
fs/f2fs/data.c | 18 ++++++++++++++++++
fs/f2fs/f2fs.h | 1 +
fs/f2fs/super.c | 2 ++
3 files changed, 21 insertions(+)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 995cf78b23c5e..360b4c9080d97 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2296,6 +2296,7 @@ static int f2fs_mpage_readpages(struct inode *inode,
unsigned nr_pages = rac ? readahead_count(rac) : 1;
unsigned max_nr_pages = nr_pages;
int ret = 0;
+ bool drop_ra = false;
map.m_pblk = 0;
map.m_lblk = 0;
@@ -2306,10 +2307,24 @@ static int f2fs_mpage_readpages(struct inode *inode,
map.m_seg_type = NO_CHECK_TYPE;
map.m_may_create = false;
+ /*
+ * Two readahead threads for same address range can cause race condition
+ * which fragments sequential read IOs. So let's avoid each other.
+ */
+ if (rac && readahead_count(rac)) {
+ if (READ_ONCE(F2FS_I(inode)->ra_offset) == readahead_index(rac))
+ drop_ra = true;
+ else
+ WRITE_ONCE(F2FS_I(inode)->ra_offset,
+ readahead_index(rac));
+ }
+
for (; nr_pages; nr_pages--) {
if (rac) {
page = readahead_page(rac);
prefetchw(&page->flags);
+ if (drop_ra)
+ goto next_page;
}
#ifdef CONFIG_F2FS_FS_COMPRESSION
@@ -2372,6 +2387,9 @@ static int f2fs_mpage_readpages(struct inode *inode,
}
if (bio)
__submit_bio(F2FS_I_SB(inode), bio, DATA);
+
+ if (rac && readahead_count(rac) && !drop_ra)
+ WRITE_ONCE(F2FS_I(inode)->ra_offset, -1);
return ret;
}
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 6a655edeb522f..e6e47618a3576 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -809,6 +809,7 @@ struct f2fs_inode_info {
struct list_head inmem_pages; /* inmemory pages managed by f2fs */
struct task_struct *inmem_task; /* store inmemory task */
struct mutex inmem_lock; /* lock for inmemory pages */
+ pgoff_t ra_offset; /* ongoing readahead offset */
struct extent_tree *extent_tree; /* cached extent_tree entry */
/* avoid racing between foreground op and gc */
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 7326522057378..80cb7cd358f84 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1015,6 +1015,8 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb)
/* Will be used by directory only */
fi->i_dir_level = F2FS_SB(sb)->dir_level;
+ fi->ra_offset = -1;
+
return &fi->vfs_inode;
}
--
2.27.0.212.ge8ba1cc988-goog
On Mon, Jun 29, 2020 at 01:27:20PM -0700, Jaegeuk Kim wrote:
> If two readahead threads having same offset enter in readpages, every read
> IOs are split and issued to the disk which giving lower bandwidth.
>
> This patch tries to avoid redundant readahead calls.
>
> Signed-off-by: Jaegeuk Kim <[email protected]>
> ---
> v3:
> - use READ|WRITE_ONCE
> v2:
> - add missing code to bypass read
>
> fs/f2fs/data.c | 18 ++++++++++++++++++
> fs/f2fs/f2fs.h | 1 +
> fs/f2fs/super.c | 2 ++
> 3 files changed, 21 insertions(+)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 995cf78b23c5e..360b4c9080d97 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -2296,6 +2296,7 @@ static int f2fs_mpage_readpages(struct inode *inode,
> unsigned nr_pages = rac ? readahead_count(rac) : 1;
> unsigned max_nr_pages = nr_pages;
> int ret = 0;
> + bool drop_ra = false;
>
> map.m_pblk = 0;
> map.m_lblk = 0;
> @@ -2306,10 +2307,24 @@ static int f2fs_mpage_readpages(struct inode *inode,
> map.m_seg_type = NO_CHECK_TYPE;
> map.m_may_create = false;
>
> + /*
> + * Two readahead threads for same address range can cause race condition
> + * which fragments sequential read IOs. So let's avoid each other.
> + */
> + if (rac && readahead_count(rac)) {
> + if (READ_ONCE(F2FS_I(inode)->ra_offset) == readahead_index(rac))
> + drop_ra = true;
> + else
> + WRITE_ONCE(F2FS_I(inode)->ra_offset,
> + readahead_index(rac));
> + }
> +
> for (; nr_pages; nr_pages--) {
> if (rac) {
> page = readahead_page(rac);
> prefetchw(&page->flags);
> + if (drop_ra)
> + goto next_page;
When CONFIG_F2FS_FS_COMPRESSION is not set (i.e. x86_64 defconfig +
CONFIG_F2FS_FS=y):
$ make -skj"$(nproc)" O=out distclean defconfig fs/f2fs/data.o
../fs/f2fs/data.c: In function ‘f2fs_mpage_readpages’:
../fs/f2fs/data.c:2327:5: error: label ‘next_page’ used but not defined
2327 | goto next_page;
| ^~~~
...
Cheers,
Nathan
On 06/30, Nathan Chancellor wrote:
> On Mon, Jun 29, 2020 at 01:27:20PM -0700, Jaegeuk Kim wrote:
> > If two readahead threads having same offset enter in readpages, every read
> > IOs are split and issued to the disk which giving lower bandwidth.
> >
> > This patch tries to avoid redundant readahead calls.
> >
> > Signed-off-by: Jaegeuk Kim <[email protected]>
> > ---
> > v3:
> > - use READ|WRITE_ONCE
> > v2:
> > - add missing code to bypass read
> >
> > fs/f2fs/data.c | 18 ++++++++++++++++++
> > fs/f2fs/f2fs.h | 1 +
> > fs/f2fs/super.c | 2 ++
> > 3 files changed, 21 insertions(+)
> >
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index 995cf78b23c5e..360b4c9080d97 100644
> > --- a/fs/f2fs/data.c
> > +++ b/fs/f2fs/data.c
> > @@ -2296,6 +2296,7 @@ static int f2fs_mpage_readpages(struct inode *inode,
> > unsigned nr_pages = rac ? readahead_count(rac) : 1;
> > unsigned max_nr_pages = nr_pages;
> > int ret = 0;
> > + bool drop_ra = false;
> >
> > map.m_pblk = 0;
> > map.m_lblk = 0;
> > @@ -2306,10 +2307,24 @@ static int f2fs_mpage_readpages(struct inode *inode,
> > map.m_seg_type = NO_CHECK_TYPE;
> > map.m_may_create = false;
> >
> > + /*
> > + * Two readahead threads for same address range can cause race condition
> > + * which fragments sequential read IOs. So let's avoid each other.
> > + */
> > + if (rac && readahead_count(rac)) {
> > + if (READ_ONCE(F2FS_I(inode)->ra_offset) == readahead_index(rac))
> > + drop_ra = true;
> > + else
> > + WRITE_ONCE(F2FS_I(inode)->ra_offset,
> > + readahead_index(rac));
> > + }
> > +
> > for (; nr_pages; nr_pages--) {
> > if (rac) {
> > page = readahead_page(rac);
> > prefetchw(&page->flags);
> > + if (drop_ra)
> > + goto next_page;
>
> When CONFIG_F2FS_FS_COMPRESSION is not set (i.e. x86_64 defconfig +
> CONFIG_F2FS_FS=y):
>
> $ make -skj"$(nproc)" O=out distclean defconfig fs/f2fs/data.o
> ../fs/f2fs/data.c: In function ‘f2fs_mpage_readpages’:
> ../fs/f2fs/data.c:2327:5: error: label ‘next_page’ used but not defined
> 2327 | goto next_page;
> | ^~~~
> ...
Thanks. I pushed the fix for -next.
https://lore.kernel.org/linux-f2fs-devel/[email protected]/T/#t
Thanks,
>
> Cheers,
> Nathan
>
>
> _______________________________________________
> Linux-f2fs-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
On 2020/7/1 4:56, Jaegeuk Kim wrote:
> On 06/30, Nathan Chancellor wrote:
>> On Mon, Jun 29, 2020 at 01:27:20PM -0700, Jaegeuk Kim wrote:
>>> If two readahead threads having same offset enter in readpages, every read
>>> IOs are split and issued to the disk which giving lower bandwidth.
>>>
>>> This patch tries to avoid redundant readahead calls.
>>>
>>> Signed-off-by: Jaegeuk Kim <[email protected]>
>>> ---
>>> v3:
>>> - use READ|WRITE_ONCE
>>> v2:
>>> - add missing code to bypass read
>>>
>>> fs/f2fs/data.c | 18 ++++++++++++++++++
>>> fs/f2fs/f2fs.h | 1 +
>>> fs/f2fs/super.c | 2 ++
>>> 3 files changed, 21 insertions(+)
>>>
>>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>>> index 995cf78b23c5e..360b4c9080d97 100644
>>> --- a/fs/f2fs/data.c
>>> +++ b/fs/f2fs/data.c
>>> @@ -2296,6 +2296,7 @@ static int f2fs_mpage_readpages(struct inode *inode,
>>> unsigned nr_pages = rac ? readahead_count(rac) : 1;
>>> unsigned max_nr_pages = nr_pages;
>>> int ret = 0;
>>> + bool drop_ra = false;
>>>
>>> map.m_pblk = 0;
>>> map.m_lblk = 0;
>>> @@ -2306,10 +2307,24 @@ static int f2fs_mpage_readpages(struct inode *inode,
>>> map.m_seg_type = NO_CHECK_TYPE;
>>> map.m_may_create = false;
>>>
>>> + /*
>>> + * Two readahead threads for same address range can cause race condition
>>> + * which fragments sequential read IOs. So let's avoid each other.
>>> + */
>>> + if (rac && readahead_count(rac)) {
>>> + if (READ_ONCE(F2FS_I(inode)->ra_offset) == readahead_index(rac))
>>> + drop_ra = true;
>>> + else
>>> + WRITE_ONCE(F2FS_I(inode)->ra_offset,
>>> + readahead_index(rac));
>>> + }
>>> +
>>> for (; nr_pages; nr_pages--) {
>>> if (rac) {
>>> page = readahead_page(rac);
>>> prefetchw(&page->flags);
>>> + if (drop_ra)
>>> + goto next_page;
>>
>> When CONFIG_F2FS_FS_COMPRESSION is not set (i.e. x86_64 defconfig +
>> CONFIG_F2FS_FS=y):
>>
>> $ make -skj"$(nproc)" O=out distclean defconfig fs/f2fs/data.o
>> ../fs/f2fs/data.c: In function ‘f2fs_mpage_readpages’:
>> ../fs/f2fs/data.c:2327:5: error: label ‘next_page’ used but not defined
>> 2327 | goto next_page;
>> | ^~~~
>> ...
>
> Thanks. I pushed the fix for -next.
> https://lore.kernel.org/linux-f2fs-devel/[email protected]/T/#t
Reviewed-by: Chao Yu <[email protected]>
Thanks,
>
> Thanks,
>
>>
>> Cheers,
>> Nathan
>>
>>
>> _______________________________________________
>> Linux-f2fs-devel mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>
>
> _______________________________________________
> Linux-f2fs-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>
On 2020/7/1 9:59, Chao Yu wrote:
> On 2020/7/1 4:56, Jaegeuk Kim wrote:
>> On 06/30, Nathan Chancellor wrote:
>>> On Mon, Jun 29, 2020 at 01:27:20PM -0700, Jaegeuk Kim wrote:
>>>> If two readahead threads having same offset enter in readpages, every read
>>>> IOs are split and issued to the disk which giving lower bandwidth.
>>>>
>>>> This patch tries to avoid redundant readahead calls.
>>>>
>>>> Signed-off-by: Jaegeuk Kim <[email protected]>
>>>> ---
>>>> v3:
>>>> - use READ|WRITE_ONCE
>>>> v2:
>>>> - add missing code to bypass read
>>>>
>>>> fs/f2fs/data.c | 18 ++++++++++++++++++
>>>> fs/f2fs/f2fs.h | 1 +
>>>> fs/f2fs/super.c | 2 ++
>>>> 3 files changed, 21 insertions(+)
>>>>
>>>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>>>> index 995cf78b23c5e..360b4c9080d97 100644
>>>> --- a/fs/f2fs/data.c
>>>> +++ b/fs/f2fs/data.c
>>>> @@ -2296,6 +2296,7 @@ static int f2fs_mpage_readpages(struct inode *inode,
>>>> unsigned nr_pages = rac ? readahead_count(rac) : 1;
>>>> unsigned max_nr_pages = nr_pages;
>>>> int ret = 0;
>>>> + bool drop_ra = false;
>>>>
>>>> map.m_pblk = 0;
>>>> map.m_lblk = 0;
>>>> @@ -2306,10 +2307,24 @@ static int f2fs_mpage_readpages(struct inode *inode,
>>>> map.m_seg_type = NO_CHECK_TYPE;
>>>> map.m_may_create = false;
>>>>
>>>> + /*
>>>> + * Two readahead threads for same address range can cause race condition
>>>> + * which fragments sequential read IOs. So let's avoid each other.
>>>> + */
>>>> + if (rac && readahead_count(rac)) {
>>>> + if (READ_ONCE(F2FS_I(inode)->ra_offset) == readahead_index(rac))
>>>> + drop_ra = true;
>>>> + else
>>>> + WRITE_ONCE(F2FS_I(inode)->ra_offset,
>>>> + readahead_index(rac));
>>>> + }
>>>> +
>>>> for (; nr_pages; nr_pages--) {
>>>> if (rac) {
>>>> page = readahead_page(rac);
>>>> prefetchw(&page->flags);
>>>> + if (drop_ra)
>>>> + goto next_page;
>>>
>>> When CONFIG_F2FS_FS_COMPRESSION is not set (i.e. x86_64 defconfig +
>>> CONFIG_F2FS_FS=y):
>>>
>>> $ make -skj"$(nproc)" O=out distclean defconfig fs/f2fs/data.o
>>> ../fs/f2fs/data.c: In function ‘f2fs_mpage_readpages’:
>>> ../fs/f2fs/data.c:2327:5: error: label ‘next_page’ used but not defined
>>> 2327 | goto next_page;
>>> | ^~~~
>>> ...
>>
>> Thanks. I pushed the fix for -next.
>> https://lore.kernel.org/linux-f2fs-devel/[email protected]/T/#t
It will hang the kernel because we missed to unlock those cached pages,
I changed to 'goto set_error_page', the issue was gone.
Thanks,
>
> Reviewed-by: Chao Yu <[email protected]>
>
> Thanks,
>
>>
>> Thanks,
>>
>>>
>>> Cheers,
>>> Nathan
>>>
>>>
>>> _______________________________________________
>>> Linux-f2fs-devel mailing list
>>> [email protected]
>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>>
>>
>> _______________________________________________
>> Linux-f2fs-devel mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>>
>
>
> _______________________________________________
> Linux-f2fs-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>
From 3634864095bd1aafbb60ff49dac7d13ce157b658 Mon Sep 17 00:00:00 2001
From: Jaegeuk Kim <[email protected]>
Date: Mon, 22 Jun 2020 23:01:05 -0700
Subject: [PATCH] f2fs: avoid readahead race condition
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
If two readahead threads having same offset enter in readpages, every read
IOs are split and issued to the disk which giving lower bandwidth.
This patch tries to avoid redundant readahead calls.
Fixes one build error reported by Randy.
Fix build error when F2FS_FS_COMPRESSION is not set/enabled.
This label is needed in either case.
../fs/f2fs/data.c: In function ‘f2fs_mpage_readpages’:
../fs/f2fs/data.c:2327:5: error: label ‘next_page’ used but not defined
goto next_page;
Reviewed-by: Chao Yu <[email protected]>
Signed-off-by: Jaegeuk Kim <[email protected]>
---
v4:
- fix missing unlock_page
v3:
- use READ|WRITE_ONCE
v2:
- add missing code to bypass read
fs/f2fs/data.c | 20 ++++++++++++++++++++
fs/f2fs/f2fs.h | 1 +
fs/f2fs/super.c | 2 ++
3 files changed, 23 insertions(+)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 995cf78b23c5e..066d29938c03a 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2296,6 +2296,7 @@ static int f2fs_mpage_readpages(struct inode *inode,
unsigned nr_pages = rac ? readahead_count(rac) : 1;
unsigned max_nr_pages = nr_pages;
int ret = 0;
+ bool drop_ra = false;
map.m_pblk = 0;
map.m_lblk = 0;
@@ -2306,10 +2307,26 @@ static int f2fs_mpage_readpages(struct inode *inode,
map.m_seg_type = NO_CHECK_TYPE;
map.m_may_create = false;
+ /*
+ * Two readahead threads for same address range can cause race condition
+ * which fragments sequential read IOs. So let's avoid each other.
+ */
+ if (rac && readahead_count(rac)) {
+ if (READ_ONCE(F2FS_I(inode)->ra_offset) == readahead_index(rac))
+ drop_ra = true;
+ else
+ WRITE_ONCE(F2FS_I(inode)->ra_offset,
+ readahead_index(rac));
+ }
+
for (; nr_pages; nr_pages--) {
if (rac) {
page = readahead_page(rac);
prefetchw(&page->flags);
+ if (drop_ra) {
+ f2fs_put_page(page, 1);
+ continue;
+ }
}
#ifdef CONFIG_F2FS_FS_COMPRESSION
@@ -2372,6 +2389,9 @@ static int f2fs_mpage_readpages(struct inode *inode,
}
if (bio)
__submit_bio(F2FS_I_SB(inode), bio, DATA);
+
+ if (rac && readahead_count(rac) && !drop_ra)
+ WRITE_ONCE(F2FS_I(inode)->ra_offset, -1);
return ret;
}
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 6a655edeb522f..e6e47618a3576 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -809,6 +809,7 @@ struct f2fs_inode_info {
struct list_head inmem_pages; /* inmemory pages managed by f2fs */
struct task_struct *inmem_task; /* store inmemory task */
struct mutex inmem_lock; /* lock for inmemory pages */
+ pgoff_t ra_offset; /* ongoing readahead offset */
struct extent_tree *extent_tree; /* cached extent_tree entry */
/* avoid racing between foreground op and gc */
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 7326522057378..80cb7cd358f84 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1015,6 +1015,8 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb)
/* Will be used by directory only */
fi->i_dir_level = F2FS_SB(sb)->dir_level;
+ fi->ra_offset = -1;
+
return &fi->vfs_inode;
}
--
2.27.0.212.ge8ba1cc988-goog
On 07/01, Chao Yu wrote:
> On 2020/7/1 9:59, Chao Yu wrote:
> > On 2020/7/1 4:56, Jaegeuk Kim wrote:
> >> On 06/30, Nathan Chancellor wrote:
> >>> On Mon, Jun 29, 2020 at 01:27:20PM -0700, Jaegeuk Kim wrote:
> >>>> If two readahead threads having same offset enter in readpages, every read
> >>>> IOs are split and issued to the disk which giving lower bandwidth.
> >>>>
> >>>> This patch tries to avoid redundant readahead calls.
> >>>>
> >>>> Signed-off-by: Jaegeuk Kim <[email protected]>
> >>>> ---
> >>>> v3:
> >>>> - use READ|WRITE_ONCE
> >>>> v2:
> >>>> - add missing code to bypass read
> >>>>
> >>>> fs/f2fs/data.c | 18 ++++++++++++++++++
> >>>> fs/f2fs/f2fs.h | 1 +
> >>>> fs/f2fs/super.c | 2 ++
> >>>> 3 files changed, 21 insertions(+)
> >>>>
> >>>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> >>>> index 995cf78b23c5e..360b4c9080d97 100644
> >>>> --- a/fs/f2fs/data.c
> >>>> +++ b/fs/f2fs/data.c
> >>>> @@ -2296,6 +2296,7 @@ static int f2fs_mpage_readpages(struct inode *inode,
> >>>> unsigned nr_pages = rac ? readahead_count(rac) : 1;
> >>>> unsigned max_nr_pages = nr_pages;
> >>>> int ret = 0;
> >>>> + bool drop_ra = false;
> >>>>
> >>>> map.m_pblk = 0;
> >>>> map.m_lblk = 0;
> >>>> @@ -2306,10 +2307,24 @@ static int f2fs_mpage_readpages(struct inode *inode,
> >>>> map.m_seg_type = NO_CHECK_TYPE;
> >>>> map.m_may_create = false;
> >>>>
> >>>> + /*
> >>>> + * Two readahead threads for same address range can cause race condition
> >>>> + * which fragments sequential read IOs. So let's avoid each other.
> >>>> + */
> >>>> + if (rac && readahead_count(rac)) {
> >>>> + if (READ_ONCE(F2FS_I(inode)->ra_offset) == readahead_index(rac))
> >>>> + drop_ra = true;
> >>>> + else
> >>>> + WRITE_ONCE(F2FS_I(inode)->ra_offset,
> >>>> + readahead_index(rac));
> >>>> + }
> >>>> +
> >>>> for (; nr_pages; nr_pages--) {
> >>>> if (rac) {
> >>>> page = readahead_page(rac);
> >>>> prefetchw(&page->flags);
> >>>> + if (drop_ra)
> >>>> + goto next_page;
> >>>
> >>> When CONFIG_F2FS_FS_COMPRESSION is not set (i.e. x86_64 defconfig +
> >>> CONFIG_F2FS_FS=y):
> >>>
> >>> $ make -skj"$(nproc)" O=out distclean defconfig fs/f2fs/data.o
> >>> ../fs/f2fs/data.c: In function ‘f2fs_mpage_readpages’:
> >>> ../fs/f2fs/data.c:2327:5: error: label ‘next_page’ used but not defined
> >>> 2327 | goto next_page;
> >>> | ^~~~
> >>> ...
> >>
> >> Thanks. I pushed the fix for -next.
> >> https://lore.kernel.org/linux-f2fs-devel/[email protected]/T/#t
>
> It will hang the kernel because we missed to unlock those cached pages,
> I changed to 'goto set_error_page', the issue was gone.
How about v4?
>
> Thanks,
>
> >
> > Reviewed-by: Chao Yu <[email protected]>
> >
> > Thanks,
> >
> >>
> >> Thanks,
> >>
> >>>
> >>> Cheers,
> >>> Nathan
> >>>
> >>>
> >>> _______________________________________________
> >>> Linux-f2fs-devel mailing list
> >>> [email protected]
> >>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> >>
> >>
> >> _______________________________________________
> >> Linux-f2fs-devel mailing list
> >> [email protected]
> >> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> >>
> >
> >
> > _______________________________________________
> > Linux-f2fs-devel mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> >
On 2020/7/2 0:14, Jaegeuk Kim wrote:
> How about v4?
It looks good to me.
Thanks,