[f2fs-dev] [PATCH v2 1/2] f2fs: add F2FS_IOC_GET_COMPRESS_OPTION ioctl

[f2fs-dev] [PATCH v2 1/2] f2fs: add F2FS_IOC_GET_COMPRESS_OPTION ioctl

[Daeho Jeong]

From: Daeho Jeong <daehojeong@google.com>

Added a new F2FS_IOC_GET_COMPRESS_OPTION ioctl to get 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;

ioctl(fd, F2FS_IOC_GET_COMPRESS_OPTION, &option);

Signed-off-by: Daeho Jeong <daehojeong@google.com>
---
 fs/f2fs/f2fs.h |  7 +++++++
 fs/f2fs/file.c | 30 ++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 53fe2853579c..a33c90cf979b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -433,6 +433,8 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
 					_IOR(F2FS_IOCTL_MAGIC, 19, __u64)
 #define F2FS_IOC_SEC_TRIM_FILE		_IOW(F2FS_IOCTL_MAGIC, 20,	\
 						struct f2fs_sectrim_range)
+#define F2FS_IOC_GET_COMPRESS_OPTION	_IOR(F2FS_IOCTL_MAGIC, 21,	\
+						struct f2fs_comp_option)
 
 /*
  * should be same as XFS_IOC_GOINGDOWN.
@@ -481,6 +483,11 @@ struct f2fs_sectrim_range {
 	u64 flags;
 };
 
+struct f2fs_comp_option {
+	u8 algorithm;
+	u8 log_cluster_size;
+};
+
 /* for inline stuff */
 #define DEF_INLINE_RESERVED_SIZE	1
 static inline int get_extra_isize(struct inode *inode);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index ef5a844de53f..7e64259f6f5e 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3936,6 +3936,33 @@ static int f2fs_sec_trim_file(struct file *filp, unsigned long arg)
 	return ret;
 }
 
+static int f2fs_ioc_get_compress_option(struct file *filp, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	struct f2fs_comp_option option;
+
+	if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
+		return -EOPNOTSUPP;
+
+	inode_lock(inode);
+
+	if (!f2fs_compressed_file(inode)) {
+		inode_unlock(inode);
+		return -EINVAL;
+	}
+
+	option.algorithm = F2FS_I(inode)->i_compress_algorithm;
+	option.log_cluster_size = F2FS_I(inode)->i_log_cluster_size;
+
+	inode_unlock(inode);
+
+	if (copy_to_user((struct f2fs_comp_option __user *)arg, &option,
+				sizeof(option)))
+		return -EFAULT;
+
+	return 0;
+}
+
 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
@@ -4024,6 +4051,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		return f2fs_reserve_compress_blocks(filp, arg);
 	case F2FS_IOC_SEC_TRIM_FILE:
 		return f2fs_sec_trim_file(filp, arg);
+	case F2FS_IOC_GET_COMPRESS_OPTION:
+		return f2fs_ioc_get_compress_option(filp, arg);
 	default:
 		return -ENOTTY;
 	}
@@ -4194,6 +4223,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case F2FS_IOC_RELEASE_COMPRESS_BLOCKS:
 	case F2FS_IOC_RESERVE_COMPRESS_BLOCKS:
 	case F2FS_IOC_SEC_TRIM_FILE:
+	case F2FS_IOC_GET_COMPRESS_OPTION:
 		break;
 	default:
 		return -ENOIOCTLCMD;
-- 
2.29.0.rc1.297.gfa9743e501-goog



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[f2fs-dev] [PATCH v2 2/2] f2fs: add F2FS_IOC_SET_COMPRESS_OPTION ioctl

[Daeho Jeong]

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>
---
 fs/f2fs/compress.c |  5 +++++
 fs/f2fs/f2fs.h     |  7 +++++++
 fs/f2fs/file.c     | 48 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 60 insertions(+)

diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 7895186cc765..3b58a41223f8 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_ready(unsigned char algorithm)
+{
+	return algorithm >= COMPRESS_MAX ? false : f2fs_cops[algorithm];
+}
+
 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..cc38afde6c04 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_ready(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_ready(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 7e64259f6f5e..b18ef22e2d9d 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3963,6 +3963,51 @@ 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;
+
+	if (!f2fs_sb_has_compression(sbi))
+		return -EOPNOTSUPP;
+
+	if (!f2fs_compressed_file(inode))
+		return -EINVAL;
+
+	if (!(filp->f_mode & FMODE_WRITE))
+		return -EBADF;
+
+	if (copy_from_user(&option, (struct f2fs_comp_option __user *)arg,
+				sizeof(option)))
+		return -EFAULT;
+
+	if (option.log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
+			option.log_cluster_size > MAX_COMPRESS_LOG_SIZE ||
+			!f2fs_is_compress_algorithm_ready(option.algorithm))
+		return -EINVAL;
+
+	file_start_write(filp);
+	inode_lock(inode);
+
+	if (f2fs_is_mmap_file(inode) ||
+			get_dirty_pages(inode) || inode->i_size) {
+		ret = -EINVAL;
+		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);
+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 +4098,8 @@ 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 +4271,7 @@ 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;
-- 
2.29.0.rc1.297.gfa9743e501-goog



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Re: [f2fs-dev] [PATCH v2 1/2] f2fs: add F2FS_IOC_GET_COMPRESS_OPTION ioctl

[Eric Biggers]

On Thu, Oct 22, 2020 at 12:58:47PM +0900, Daeho Jeong wrote:
> +	if (!f2fs_compressed_file(inode)) {
> +		inode_unlock(inode);
> +		return -EINVAL;
> +	}

How about using ENODATA here?  EINVAL tends to be used for lots of different
reasons, and it's not always clear what it means.

Note that FS_IOC_GET_ENCRYPTION_POLICY fails with ENODATA when called on an
unencrypted file, which is a similar case.

- Eric


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Re: [f2fs-dev] [PATCH v2 2/2] f2fs: add F2FS_IOC_SET_COMPRESS_OPTION ioctl

[Eric Biggers]

On Thu, Oct 22, 2020 at 12:58:48PM +0900, Daeho Jeong wrote:
> diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> index 7895186cc765..3b58a41223f8 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_ready(unsigned char algorithm)
> +{
> +	return algorithm >= COMPRESS_MAX ? false : f2fs_cops[algorithm];
> +}

The use of ?: here is a bit strange.  How about:

	return algorithm < COMPRESS_MAX && f2fs_cops[algorithm] != NULL;

> +	if (option.log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
> +			option.log_cluster_size > MAX_COMPRESS_LOG_SIZE ||
> +			!f2fs_is_compress_algorithm_ready(option.algorithm))
> +		return -EINVAL;

Likewise, EINVAL tends to be over-used, which makes it ambiguous.  Maybe use
ENOPKG for the case where algorithm < COMPRESS_MAX but the algorithm wasn't
compiled into the kernel?  That would be similar to how opening an encrypted
file fails with ENOPKG when the encryption algorithm isn't available.

> +	if (f2fs_is_mmap_file(inode) ||
> +			get_dirty_pages(inode) || inode->i_size) {
> +		ret = -EINVAL;
> +		goto out;
> +	}

How about EBUSY for f2fs_is_mmap_file(inode) || get_dirty_pages(inode),
and EFBIG for inode->i_size != 0?

- Eric


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Re: [f2fs-dev] [PATCH v2 1/2] f2fs: add F2FS_IOC_GET_COMPRESS_OPTION ioctl

[Daeho Jeong]

Yep, it sounds more clear~

2020년 10월 22일 (목) 오후 1:22, Eric Biggers <ebiggers@kernel.org>님이 작성:
>
> On Thu, Oct 22, 2020 at 12:58:47PM +0900, Daeho Jeong wrote:
> > +     if (!f2fs_compressed_file(inode)) {
> > +             inode_unlock(inode);
> > +             return -EINVAL;
> > +     }
>
> How about using ENODATA here?  EINVAL tends to be used for lots of different
> reasons, and it's not always clear what it means.
>
> Note that FS_IOC_GET_ENCRYPTION_POLICY fails with ENODATA when called on an
> unencrypted file, which is a similar case.
>
> - Eric


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Re: [f2fs-dev] [PATCH v2 2/2] f2fs: add F2FS_IOC_SET_COMPRESS_OPTION ioctl

[Daeho Jeong]

> The use of ?: here is a bit strange.  How about:
>
>         return algorithm < COMPRESS_MAX && f2fs_cops[algorithm] != NULL;
>

Ack

> Likewise, EINVAL tends to be over-used, which makes it ambiguous.  Maybe use
> ENOPKG for the case where algorithm < COMPRESS_MAX but the algorithm wasn't
> compiled into the kernel?  That would be similar to how opening an encrypted
> file fails with ENOPKG when the encryption algorithm isn't available.

Ack

> How about EBUSY for f2fs_is_mmap_file(inode) || get_dirty_pages(inode),
> and EFBIG for inode->i_size != 0?

Ack

Thanks~!

2020년 10월 22일 (목) 오후 1:26, Eric Biggers <ebiggers@kernel.org>님이 작성:
>
> On Thu, Oct 22, 2020 at 12:58:48PM +0900, Daeho Jeong wrote:
> > diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
> > index 7895186cc765..3b58a41223f8 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_ready(unsigned char algorithm)
> > +{
> > +     return algorithm >= COMPRESS_MAX ? false : f2fs_cops[algorithm];
> > +}
>
> The use of ?: here is a bit strange.  How about:
>
>         return algorithm < COMPRESS_MAX && f2fs_cops[algorithm] != NULL;
>
> > +     if (option.log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
> > +                     option.log_cluster_size > MAX_COMPRESS_LOG_SIZE ||
> > +                     !f2fs_is_compress_algorithm_ready(option.algorithm))
> > +             return -EINVAL;
>
> Likewise, EINVAL tends to be over-used, which makes it ambiguous.  Maybe use
> ENOPKG for the case where algorithm < COMPRESS_MAX but the algorithm wasn't
> compiled into the kernel?  That would be similar to how opening an encrypted
> file fails with ENOPKG when the encryption algorithm isn't available.
>
> > +     if (f2fs_is_mmap_file(inode) ||
> > +                     get_dirty_pages(inode) || inode->i_size) {
> > +             ret = -EINVAL;
> > +             goto out;
> > +     }
>
> How about EBUSY for f2fs_is_mmap_file(inode) || get_dirty_pages(inode),
> and EFBIG for inode->i_size != 0?
>
> - Eric


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Re: [f2fs-dev] [PATCH v2 2/2] f2fs: add F2FS_IOC_SET_COMPRESS_OPTION ioctl

[Daeho Jeong]

Yep, sure~!

2020년 10월 23일 (금) 오후 9:00, Dan Carpenter <dan.carpenter@oracle.com>님이 작성:
>
> Hi Daeho,
>
> url:    https://github.com/0day-ci/linux/commits/Daeho-Jeong/f2fs-add-F2FS_IOC_GET_COMPRESS_OPTION-ioctl/20201022-115947
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev-test
> config: x86_64-randconfig-m001-20201022 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> New smatch warnings:
> fs/f2fs/file.c:4011 f2fs_ioc_set_compress_option() error: uninitialized symbol 'ret'.
>
> Old smatch warnings:
> fs/f2fs/f2fs.h:2127 dec_valid_block_count() warn: should 'count << 3' be a 64 bit type?
> fs/f2fs/file.c:2525 f2fs_ioc_gc_range() warn: inconsistent returns 'sbi->gc_lock'.
> fs/f2fs/file.c:2941 f2fs_ioc_flush_device() warn: potential spectre issue 'sbi->devs' [w] (local cap)
> fs/f2fs/file.c:2966 f2fs_ioc_flush_device() warn: inconsistent returns 'sbi->gc_lock'.
> fs/f2fs/file.c:3305 f2fs_precache_extents() error: uninitialized symbol 'err'.
>
> vim +/ret +4011 fs/f2fs/file.c
>
> d869d11ac39edb Daeho Jeong 2020-10-22  3969  static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
> d869d11ac39edb Daeho Jeong 2020-10-22  3970  {
> d869d11ac39edb Daeho Jeong 2020-10-22  3971     struct inode *inode = file_inode(filp);
> d869d11ac39edb Daeho Jeong 2020-10-22  3972     struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> d869d11ac39edb Daeho Jeong 2020-10-22  3973     struct f2fs_comp_option option;
> d869d11ac39edb Daeho Jeong 2020-10-22  3974     int ret;
> d869d11ac39edb Daeho Jeong 2020-10-22  3975
> d869d11ac39edb Daeho Jeong 2020-10-22  3976     if (!f2fs_sb_has_compression(sbi))
> d869d11ac39edb Daeho Jeong 2020-10-22  3977             return -EOPNOTSUPP;
> d869d11ac39edb Daeho Jeong 2020-10-22  3978
> d869d11ac39edb Daeho Jeong 2020-10-22  3979     if (!f2fs_compressed_file(inode))
> d869d11ac39edb Daeho Jeong 2020-10-22  3980             return -EINVAL;
> d869d11ac39edb Daeho Jeong 2020-10-22  3981
> d869d11ac39edb Daeho Jeong 2020-10-22  3982     if (!(filp->f_mode & FMODE_WRITE))
> d869d11ac39edb Daeho Jeong 2020-10-22  3983             return -EBADF;
> d869d11ac39edb Daeho Jeong 2020-10-22  3984
> d869d11ac39edb Daeho Jeong 2020-10-22  3985     if (copy_from_user(&option, (struct f2fs_comp_option __user *)arg,
> d869d11ac39edb Daeho Jeong 2020-10-22  3986                             sizeof(option)))
> d869d11ac39edb Daeho Jeong 2020-10-22  3987             return -EFAULT;
> d869d11ac39edb Daeho Jeong 2020-10-22  3988
> d869d11ac39edb Daeho Jeong 2020-10-22  3989     if (option.log_cluster_size < MIN_COMPRESS_LOG_SIZE ||
> d869d11ac39edb Daeho Jeong 2020-10-22  3990                     option.log_cluster_size > MAX_COMPRESS_LOG_SIZE ||
> d869d11ac39edb Daeho Jeong 2020-10-22  3991                     !f2fs_is_compress_algorithm_ready(option.algorithm))
> d869d11ac39edb Daeho Jeong 2020-10-22  3992             return -EINVAL;
> d869d11ac39edb Daeho Jeong 2020-10-22  3993
> d869d11ac39edb Daeho Jeong 2020-10-22  3994     file_start_write(filp);
> d869d11ac39edb Daeho Jeong 2020-10-22  3995     inode_lock(inode);
> d869d11ac39edb Daeho Jeong 2020-10-22  3996
> d869d11ac39edb Daeho Jeong 2020-10-22  3997     if (f2fs_is_mmap_file(inode) ||
> d869d11ac39edb Daeho Jeong 2020-10-22  3998                     get_dirty_pages(inode) || inode->i_size) {
> d869d11ac39edb Daeho Jeong 2020-10-22  3999             ret = -EINVAL;
> d869d11ac39edb Daeho Jeong 2020-10-22  4000             goto out;
> d869d11ac39edb Daeho Jeong 2020-10-22  4001     }
> d869d11ac39edb Daeho Jeong 2020-10-22  4002
> d869d11ac39edb Daeho Jeong 2020-10-22  4003     F2FS_I(inode)->i_compress_algorithm = option.algorithm;
> d869d11ac39edb Daeho Jeong 2020-10-22  4004     F2FS_I(inode)->i_log_cluster_size = option.log_cluster_size;
> d869d11ac39edb Daeho Jeong 2020-10-22  4005     F2FS_I(inode)->i_cluster_size = 1 << option.log_cluster_size;
> d869d11ac39edb Daeho Jeong 2020-10-22  4006     f2fs_mark_inode_dirty_sync(inode, true);
>
>
> "ret" is uninitialized on the success path.
>
> d869d11ac39edb Daeho Jeong 2020-10-22  4007  out:
> d869d11ac39edb Daeho Jeong 2020-10-22  4008     inode_unlock(inode);
> d869d11ac39edb Daeho Jeong 2020-10-22  4009     file_end_write(filp);
> d869d11ac39edb Daeho Jeong 2020-10-22  4010
> d869d11ac39edb Daeho Jeong 2020-10-22 @4011     return ret;
> d869d11ac39edb Daeho Jeong 2020-10-22  4012  }
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org


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