linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Chao Yu <yuchao0@huawei.com>
To: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: <linux-f2fs-devel@lists.sourceforge.net>,
	<linux-kernel@vger.kernel.org>, <chao@kernel.org>
Subject: Re: [PATCH v2] f2fs: separate NOCoW and pinfile semantics
Date: Tue, 23 Jul 2019 15:08:28 +0800	[thread overview]
Message-ID: <d4d064a2-2b3c-3536-6488-39e7cfdb1ea4@huawei.com> (raw)
In-Reply-To: <20190723023640.GC60778@jaegeuk-macbookpro.roam.corp.google.com>

On 2019/7/23 10:36, Jaegeuk Kim wrote:
> On 07/19, Chao Yu wrote:
>> Pinning a file is heavy, because skipping pinned files make GC
>> running with heavy load or no effect.
> 
> Pinned file is a part of NOCOW files, so I don't think we can simply drop it
> for backward compatibility.

Yes,

But what I concerned is that pin file is too heavy, so in order to satisfy below
demand, how about introducing pin_file_2 flag to triggering IPU only during
flush/writeback.

> 
>>
>> So that this patch propose to separate nocow and pinfile semantics:
>> - NOCoW flag can only be set on regular file.
>> - NOCoW file will only trigger IPU at common writeback/flush.
>> - NOCow file will do OPU during GC.
>>
>> For the demand of 1) avoid fragment of file's physical block and
>> 2) userspace don't care about file's specific physical address,
>> tagging file as NOCoW will be cheaper than pinned one.

^^^

Thanks,

>>
>> Signed-off-by: Chao Yu <yuchao0@huawei.com>
>> ---
>> v2:
>> - rebase code to fix compile error.
>>  fs/f2fs/data.c |  3 ++-
>>  fs/f2fs/f2fs.h |  1 +
>>  fs/f2fs/file.c | 22 +++++++++++++++++++---
>>  3 files changed, 22 insertions(+), 4 deletions(-)
>>
>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>> index a2a28bb269bf..15fb8954c363 100644
>> --- a/fs/f2fs/data.c
>> +++ b/fs/f2fs/data.c
>> @@ -1884,7 +1884,8 @@ static inline bool check_inplace_update_policy(struct inode *inode,
>>  
>>  bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio)
>>  {
>> -	if (f2fs_is_pinned_file(inode))
>> +	if (f2fs_is_pinned_file(inode) ||
>> +			F2FS_I(inode)->i_flags & F2FS_NOCOW_FL)
>>  		return true;
>>  
>>  	/* if this is cold file, we should overwrite to avoid fragmentation */
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index 596ab3e1dd7b..f6c5a3d2e659 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -2374,6 +2374,7 @@ static inline void f2fs_change_bit(unsigned int nr, char *addr)
>>  #define F2FS_NOATIME_FL			0x00000080 /* do not update atime */
>>  #define F2FS_INDEX_FL			0x00001000 /* hash-indexed directory */
>>  #define F2FS_DIRSYNC_FL			0x00010000 /* dirsync behaviour (directories only) */
>> +#define F2FS_NOCOW_FL			0x00800000 /* Do not cow file */
>>  #define F2FS_PROJINHERIT_FL		0x20000000 /* Create with parents projid */
>>  
>>  /* Flags that should be inherited by new inodes from their parent. */
>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
>> index 7ca545874060..ae0fec54cac6 100644
>> --- a/fs/f2fs/file.c
>> +++ b/fs/f2fs/file.c
>> @@ -1692,6 +1692,7 @@ static const struct {
>>  	{ F2FS_NOATIME_FL,	FS_NOATIME_FL },
>>  	{ F2FS_INDEX_FL,	FS_INDEX_FL },
>>  	{ F2FS_DIRSYNC_FL,	FS_DIRSYNC_FL },
>> +	{ F2FS_NOCOW_FL,	FS_NOCOW_FL },
>>  	{ F2FS_PROJINHERIT_FL,	FS_PROJINHERIT_FL },
>>  };
>>  
>> @@ -1715,7 +1716,8 @@ static const struct {
>>  		FS_NODUMP_FL |		\
>>  		FS_NOATIME_FL |		\
>>  		FS_DIRSYNC_FL |		\
>> -		FS_PROJINHERIT_FL)
>> +		FS_PROJINHERIT_FL |	\
>> +		FS_NOCOW_FL)
>>  
>>  /* Convert f2fs on-disk i_flags to FS_IOC_{GET,SET}FLAGS flags */
>>  static inline u32 f2fs_iflags_to_fsflags(u32 iflags)
>> @@ -1753,8 +1755,6 @@ static int f2fs_ioc_getflags(struct file *filp, unsigned long arg)
>>  		fsflags |= FS_ENCRYPT_FL;
>>  	if (f2fs_has_inline_data(inode) || f2fs_has_inline_dentry(inode))
>>  		fsflags |= FS_INLINE_DATA_FL;
>> -	if (is_inode_flag_set(inode, FI_PIN_FILE))
>> -		fsflags |= FS_NOCOW_FL;
>>  
>>  	fsflags &= F2FS_GETTABLE_FS_FL;
>>  
>> @@ -1794,6 +1794,22 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg)
>>  	if (ret)
>>  		goto out;
>>  
>> +	if ((fsflags ^ old_fsflags) & FS_NOCOW_FL) {
>> +		if (!S_ISREG(inode->i_mode)) {
>> +			ret = -EINVAL;
>> +			goto out;
>> +		}
>> +
>> +		if (f2fs_should_update_outplace(inode, NULL)) {
>> +			ret = -EINVAL;
>> +			goto out;
>> +		}
>> +
>> +		ret = f2fs_convert_inline_inode(inode);
>> +		if (ret)
>> +			goto out;
>> +	}
>> +
>>  	ret = f2fs_setflags_common(inode, iflags,
>>  			f2fs_fsflags_to_iflags(F2FS_SETTABLE_FS_FL));
>>  out:
>> -- 
>> 2.18.0.rc1
> .
> 

  reply	other threads:[~2019-07-23  7:08 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-19  7:39 Chao Yu
2019-07-23  2:36 ` Jaegeuk Kim
2019-07-23  7:08   ` Chao Yu [this message]
2019-07-29  5:57     ` Jaegeuk Kim
2019-07-29  7:20       ` Chao Yu
2019-07-30 18:02         ` Jaegeuk Kim
2019-07-31  9:55           ` Chao Yu
2019-08-01  4:14             ` Jaegeuk Kim
2019-08-01  7:08               ` Chao Yu
2019-08-01 22:27                 ` Jaegeuk Kim
2019-08-02  7:55                   ` Chao Yu
2019-08-06  0:37                     ` Jaegeuk Kim
2019-08-06  1:36                       ` Chao Yu
2019-09-06  2:47                         ` [f2fs-dev] " Chao Yu
2022-05-15 10:39 Chao Yu

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=d4d064a2-2b3c-3536-6488-39e7cfdb1ea4@huawei.com \
    --to=yuchao0@huawei.com \
    --cc=chao@kernel.org \
    --cc=jaegeuk@kernel.org \
    --cc=linux-f2fs-devel@lists.sourceforge.net \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: [PATCH v2] f2fs: separate NOCoW and pinfile semantics' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).