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Date:   Wed, 2 Dec 2020 22:08:10 -0800
From:   Jaegeuk Kim <jaegeuk@kernel.org>
To:     Chao Yu <yuchao0@huawei.com>
Cc:     Daeho Jeong <daehojeong@google.com>, kernel-team@android.com,
        linux-kernel@vger.kernel.org,
        linux-f2fs-devel@lists.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH v7 2/2] f2fs: add F2FS_IOC_SET_COMPRESS_OPTION
 ioctl
Message-ID: <X8iAyiB0RIgm/EgB@google.com>
References: <20201030041035.394565-1-daeho43@gmail.com>
 <20201030041035.394565-2-daeho43@gmail.com>
 <dcf074e3-821c-6858-eb17-63dcc05e7039@huawei.com>
 <X8h6XK6cYwXqGnV7@google.com>
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On 12/02, Jaegeuk Kim wrote:
> On 12/03, Chao Yu wrote:
> > Jaegeuk, not sure, is it too late to merge this cleanup into original patch?
> 
> Let me merge this on top of tree. Thanks. :)

I integrated this into the original patch since I had to revise this commit. :(
("f2fs: avoid race condition for shinker count")

> 
> > 
> > From a5c63ec58e0cda6eb5d186b46942eea46422b7a9 Mon Sep 17 00:00:00 2001
> > From: Chao Yu <yuchao0@huawei.com>
> > Date: Thu, 3 Dec 2020 10:04:26 +0800
> > Subject: [PATCH] f2fs: remove f2fs_is_compress_algorithm_valid() for cleanup
> > 
> > No logic changes.
> > 
> > Signed-off-by: Chao Yu <yuchao0@huawei.com>
> > ---
> >  fs/f2fs/compress.c | 5 -----
> >  fs/f2fs/f2fs.h     | 5 -----
> >  fs/f2fs/file.c     | 2 +-
> >  3 files changed, 1 insertion(+), 11 deletions(-)
> > 
> > diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> > index dfadbc78946c..869b047a4801 100644
> > --- a/fs/f2fs/compress.c
> > +++ b/fs/f2fs/compress.c
> > @@ -574,11 +574,6 @@ bool f2fs_is_compress_backend_ready(struct inode *inode)
> >  	return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
> >  }
> > 
> > -bool f2fs_is_compress_algorithm_valid(unsigned char algorithm)
> > -{
> > -	return f2fs_cops[algorithm] != NULL;
> > -}
> > -
> >  static mempool_t *compress_page_pool;
> >  static int num_compress_pages = 512;
> >  module_param(num_compress_pages, uint, 0444);
> > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > index b70c8d553439..17b45c2d2b04 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -3882,7 +3882,6 @@ bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
> >  int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock);
> >  void f2fs_compress_write_end_io(struct bio *bio, struct page *page);
> >  bool f2fs_is_compress_backend_ready(struct inode *inode);
> > -bool f2fs_is_compress_algorithm_valid(unsigned char algorithm);
> >  int f2fs_init_compress_mempool(void);
> >  void f2fs_destroy_compress_mempool(void);
> >  void f2fs_do_decompress_pages(struct decompress_io_ctx *dic, bool verity);
> > @@ -3927,10 +3926,6 @@ static inline bool f2fs_is_compress_backend_ready(struct inode *inode)
> >  	/* not support compression */
> >  	return false;
> >  }
> > -static inline bool f2fs_is_compress_algorithm_valid(unsigned char algorithm)
> > -{
> > -	return false;
> > -}
> >  static inline struct page *f2fs_compress_control_page(struct page *page)
> >  {
> >  	WARN_ON_ONCE(1);
> > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > index 300355fe25f0..0453b441228d 100644
> > --- a/fs/f2fs/file.c
> > +++ b/fs/f2fs/file.c
> > @@ -4016,7 +4016,7 @@ static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
> >  	F2FS_I(inode)->i_cluster_size = 1 << option.log_cluster_size;
> >  	f2fs_mark_inode_dirty_sync(inode, true);
> > 
> > -	if (!f2fs_is_compress_algorithm_valid(option.algorithm))
> > +	if (!f2fs_is_compress_backend_ready(inode))
> >  		f2fs_warn(sbi, "compression algorithm is successfully set, "
> >  			"but current kernel doesn't support this algorithm.");
> >  out:
> > -- 
> > 2.26.2
> > 
> > 
> > 
> > 
> > 
> > On 2020/10/30 12:10, Daeho Jeong wrote:
> > > From: Daeho Jeong <daehojeong@google.com>
> > > 
> > > Added a new F2FS_IOC_SET_COMPRESS_OPTION ioctl to change file
> > > compression option of a file.
> > > 
> > > struct f2fs_comp_option {
> > >      u8 algorithm;         => compression algorithm
> > >                            => 0:lzo, 1:lz4, 2:zstd, 3:lzorle
> > >      u8 log_cluster_size;  => log scale cluster size
> > >                            => 2 ~ 8
> > > };
> > > 
> > > struct f2fs_comp_option option;
> > > 
> > > option.algorithm = 1;
> > > option.log_cluster_size = 7;
> > > 
> > > ioctl(fd, F2FS_IOC_SET_COMPRESS_OPTION, &option);
> > > 
> > > Signed-off-by: Daeho Jeong <daehojeong@google.com>
> > > ---
> > > 
> > > v6: changed the function name of checking compression algorithm validity.
> > > v5: allowed to set algorithm which is not currently enabled by kernel.
> > > v4: changed commit message.
> > > v3: changed the error number more specific.
> > >      folded in fix for build breakage reported by kernel test robot
> > >      <lkp@intel.com> and Dan Carpenter <dan.carpenter@oracle.com>.
> > > v2: added ioctl description.
> > > ---
> > >   fs/f2fs/compress.c |  5 +++++
> > >   fs/f2fs/f2fs.h     |  7 ++++++
> > >   fs/f2fs/file.c     | 54 ++++++++++++++++++++++++++++++++++++++++++++++
> > >   3 files changed, 66 insertions(+)
> > > 
> > > diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> > > index 7895186cc765..b0144670d320 100644
> > > --- a/fs/f2fs/compress.c
> > > +++ b/fs/f2fs/compress.c
> > > @@ -514,6 +514,11 @@ bool f2fs_is_compress_backend_ready(struct inode *inode)
> > >   	return f2fs_cops[F2FS_I(inode)->i_compress_algorithm];
> > >   }
> > > +bool f2fs_is_compress_algorithm_valid(unsigned char algorithm)
> > > +{
> > > +	return f2fs_cops[algorithm] != NULL;
> > > +}
> > > +
> > >   static mempool_t *compress_page_pool;
> > >   static int num_compress_pages = 512;
> > >   module_param(num_compress_pages, uint, 0444);
> > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > > index a33c90cf979b..70a8a2196888 100644
> > > --- a/fs/f2fs/f2fs.h
> > > +++ b/fs/f2fs/f2fs.h
> > > @@ -435,6 +435,8 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
> > >   						struct f2fs_sectrim_range)
> > >   #define F2FS_IOC_GET_COMPRESS_OPTION	_IOR(F2FS_IOCTL_MAGIC, 21,	\
> > >   						struct f2fs_comp_option)
> > > +#define F2FS_IOC_SET_COMPRESS_OPTION	_IOW(F2FS_IOCTL_MAGIC, 22,	\
> > > +						struct f2fs_comp_option)
> > >   /*
> > >    * should be same as XFS_IOC_GOINGDOWN.
> > > @@ -3915,6 +3917,7 @@ bool f2fs_compress_write_end(struct inode *inode, void *fsdata,
> > >   int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock);
> > >   void f2fs_compress_write_end_io(struct bio *bio, struct page *page);
> > >   bool f2fs_is_compress_backend_ready(struct inode *inode);
> > > +bool f2fs_is_compress_algorithm_valid(unsigned char algorithm);
> > >   int f2fs_init_compress_mempool(void);
> > >   void f2fs_destroy_compress_mempool(void);
> > >   void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity);
> > > @@ -3945,6 +3948,10 @@ static inline bool f2fs_is_compress_backend_ready(struct inode *inode)
> > >   	/* not support compression */
> > >   	return false;
> > >   }
> > > +static inline bool f2fs_is_compress_algorithm_valid(unsigned char algorithm)
> > > +{
> > > +	return false;
> > > +}
> > >   static inline struct page *f2fs_compress_control_page(struct page *page)
> > >   {
> > >   	WARN_ON_ONCE(1);
> > > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > > index bd52df84219d..be56702e4939 100644
> > > --- a/fs/f2fs/file.c
> > > +++ b/fs/f2fs/file.c
> > > @@ -3963,6 +3963,57 @@ static int f2fs_ioc_get_compress_option(struct file *filp, unsigned long arg)
> > >   	return 0;
> > >   }
> > > +static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
> > > +{
> > > +	struct inode *inode = file_inode(filp);
> > > +	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> > > +	struct f2fs_comp_option option;
> > > +	int ret = 0;
> > > +
> > > +	if (!f2fs_sb_has_compression(sbi))
> > > +		return -EOPNOTSUPP;
> > > +
> > > +	if (!(filp->f_mode & FMODE_WRITE))
> > > +		return -EBADF;
> > > +
> > > +	if (copy_from_user(&option, (struct f2fs_comp_option __user *)arg,
> > > +				sizeof(option)))
> > > +		return -EFAULT;
> > > +
> > > +	if (!f2fs_compressed_file(inode) ||
> > > +			option.log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
> > > +			option.log_cluster_size > MAX_COMPRESS_LOG_SIZE ||
> > > +			option.algorithm >= COMPRESS_MAX)
> > > +		return -EINVAL;
> > > +
> > > +	file_start_write(filp);
> > > +	inode_lock(inode);
> > > +
> > > +	if (f2fs_is_mmap_file(inode) || get_dirty_pages(inode)) {
> > > +		ret = -EBUSY;
> > > +		goto out;
> > > +	}
> > > +
> > > +	if (inode->i_size != 0) {
> > > +		ret = -EFBIG;
> > > +		goto out;
> > > +	}
> > > +
> > > +	F2FS_I(inode)->i_compress_algorithm = option.algorithm;
> > > +	F2FS_I(inode)->i_log_cluster_size = option.log_cluster_size;
> > > +	F2FS_I(inode)->i_cluster_size = 1 << option.log_cluster_size;
> > > +	f2fs_mark_inode_dirty_sync(inode, true);
> > > +
> > > +	if (!f2fs_is_compress_algorithm_valid(option.algorithm))
> > > +		f2fs_warn(sbi, "compression algorithm is successfully set, "
> > > +			"but current kernel doesn't support this algorithm.");
> > > +out:
> > > +	inode_unlock(inode);
> > > +	file_end_write(filp);
> > > +
> > > +	return ret;
> > > +}
> > > +
> > >   long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> > >   {
> > >   	if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
> > > @@ -4053,6 +4104,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> > >   		return f2fs_sec_trim_file(filp, arg);
> > >   	case F2FS_IOC_GET_COMPRESS_OPTION:
> > >   		return f2fs_ioc_get_compress_option(filp, arg);
> > > +	case F2FS_IOC_SET_COMPRESS_OPTION:
> > > +		return f2fs_ioc_set_compress_option(filp, arg);
> > >   	default:
> > >   		return -ENOTTY;
> > >   	}
> > > @@ -4224,6 +4277,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> > >   	case F2FS_IOC_RESERVE_COMPRESS_BLOCKS:
> > >   	case F2FS_IOC_SEC_TRIM_FILE:
> > >   	case F2FS_IOC_GET_COMPRESS_OPTION:
> > > +	case F2FS_IOC_SET_COMPRESS_OPTION:
> > >   		break;
> > >   	default:
> > >   		return -ENOIOCTLCMD;
> > > 
> 
> 
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