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Date: Sat, 28 Jan 2023 18:34:07 +0800
From: Chao Yu <chao@...nel.org>
To: Yangtao Li <frank.li@...o.com>, jaegeuk@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] f2fs: add F2FS_IOC_SET_COMPRESS_OPTION_V2 ioctl
On 2023/1/12 21:35, Yangtao Li wrote:
> Added a new F2FS_IOC_SET_COMPRESS_OPTION_V2 ioctl to change file
> compression option of a file.
>
> struct f2fs_comp_option_v2 {
> union {
> struct {
> __u8 algorithm;
> __u8 log_cluster_size;
> __u16 compress_flag;
> };
> struct f2fs_comp_option option;
> };
> };
>
> struct f2fs_comp_option_v2 option;
>
> option.algorithm = 2;
> option.log_cluster_size = 2;
> option.compress_flag = (5 << COMPRESS_LEVEL_OFFSET) | BIT(COMPRESS_CHKSUM);
>
> ioctl(fd, F2FS_IOC_SET_COMPRESS_OPTION_V2, &option);
>
> Signed-off-by: Yangtao Li <frank.li@...o.com>
> ---
> fs/f2fs/f2fs.h | 8 +-------
> fs/f2fs/file.c | 41 ++++++++++++++++++++++++++++++++-------
> include/uapi/linux/f2fs.h | 21 ++++++++++++++++++++
> 3 files changed, 56 insertions(+), 14 deletions(-)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index f3c5f7740c1a..c2267f44bcf8 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -25,6 +25,7 @@
> #include <linux/quotaops.h>
> #include <linux/part_stat.h>
> #include <crypto/hash.h>
> +#include <uapi/linux/f2fs.h>
>
> #include <linux/fscrypt.h>
> #include <linux/fsverity.h>
> @@ -1501,11 +1502,6 @@ enum compress_algorithm_type {
> COMPRESS_MAX,
> };
>
> -enum compress_flag {
> - COMPRESS_CHKSUM,
> - COMPRESS_MAX_FLAG,
> -};
> -
> #define COMPRESS_WATERMARK 20
> #define COMPRESS_PERCENT 20
>
> @@ -1521,8 +1517,6 @@ struct compress_data {
>
> #define F2FS_COMPRESSED_PAGE_MAGIC 0xF5F2C000
>
> -#define COMPRESS_LEVEL_OFFSET 8
> -
> /* compress context */
> struct compress_ctx {
> struct inode *inode; /* inode the context belong to */
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index f5c1b7814954..719706ef0d46 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -25,6 +25,8 @@
> #include <linux/fileattr.h>
> #include <linux/fadvise.h>
> #include <linux/iomap.h>
> +#include <linux/zstd.h>
> +#include <linux/lz4.h>
>
> #include "f2fs.h"
> #include "node.h"
> @@ -3910,12 +3912,13 @@ 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)
> +static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg,
> + unsigned int cmd)
> {
> struct inode *inode = file_inode(filp);
> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
> - struct f2fs_comp_option option;
> - int ret = 0;
> + struct f2fs_comp_option_v2 option;
> + int ret = 0, len;
>
> if (!f2fs_sb_has_compression(sbi))
> return -EOPNOTSUPP;
> @@ -3923,8 +3926,12 @@ static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
> if (!(filp->f_mode & FMODE_WRITE))
> return -EBADF;
>
> - if (copy_from_user(&option, (struct f2fs_comp_option __user *)arg,
> - sizeof(option)))
> + if (cmd == F2FS_IOC_SET_COMPRESS_OPTION_V2)
> + len = sizeof(struct f2fs_comp_option_v2);
> + else
> + len = sizeof(struct f2fs_comp_option);
> +
> + if (copy_from_user(&option, (void __user *)arg, len))
> return -EFAULT;
>
> if (!f2fs_compressed_file(inode) ||
> @@ -3933,6 +3940,21 @@ static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
> option.algorithm >= COMPRESS_MAX)
> return -EINVAL;
>
> + if (cmd == F2FS_IOC_SET_COMPRESS_OPTION_V2) {
> + unsigned int level = GET_COMPRESS_LEVEL(option.compress_flag);
> +
> + switch (option.algorithm) {
> + case COMPRESS_LZ4:
> + if (level < LZ4HC_MIN_CLEVEL || level > LZ4HC_MAX_CLEVEL)
> + return -EINVAL;
> + break;
level=0 indicates lz4, so it's allowed?
> + case COMPRESS_ZSTD:
> + if (!level || level > zstd_max_clevel())
> + return -EINVAL;
> + break;
default:
return -EINVAL;
> + }
> + }
> +
> file_start_write(filp);
> inode_lock(inode);
>
> @@ -3948,7 +3970,10 @@ static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg)
>
> 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_I(inode)->i_cluster_size = BIT(option.log_cluster_size);
> +
> + if (cmd == F2FS_IOC_SET_COMPRESS_OPTION_V2)
> + F2FS_I(inode)->i_compress_flag = option.compress_flag & COMPRESS_OPTION_MASK;
> f2fs_mark_inode_dirty_sync(inode, true);
>
> if (!f2fs_is_compress_backend_ready(inode))
> @@ -4221,7 +4246,9 @@ static long __f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long 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);
> + return f2fs_ioc_set_compress_option(filp, arg, F2FS_IOC_SET_COMPRESS_OPTION);
> + case F2FS_IOC_SET_COMPRESS_OPTION_V2:
> + return f2fs_ioc_set_compress_option(filp, arg, F2FS_IOC_SET_COMPRESS_OPTION_V2);
It needs to adapt f2fs_compat_ioctl() as well.
> case F2FS_IOC_DECOMPRESS_FILE:
> return f2fs_ioc_decompress_file(filp, arg);
> case F2FS_IOC_COMPRESS_FILE:
> diff --git a/include/uapi/linux/f2fs.h b/include/uapi/linux/f2fs.h
> index 955d440be104..aaf7f55273fb 100644
> --- a/include/uapi/linux/f2fs.h
> +++ b/include/uapi/linux/f2fs.h
> @@ -43,6 +43,8 @@
> #define F2FS_IOC_DECOMPRESS_FILE _IO(F2FS_IOCTL_MAGIC, 23)
> #define F2FS_IOC_COMPRESS_FILE _IO(F2FS_IOCTL_MAGIC, 24)
> #define F2FS_IOC_START_ATOMIC_REPLACE _IO(F2FS_IOCTL_MAGIC, 25)
> +#define F2FS_IOC_SET_COMPRESS_OPTION_V2 _IOW(F2FS_IOCTL_MAGIC, 26, \
> + struct f2fs_comp_option_v2)
>
> /*
> * should be same as XFS_IOC_GOINGDOWN.
> @@ -62,6 +64,15 @@
> #define F2FS_TRIM_FILE_ZEROOUT 0x2 /* zero out */
> #define F2FS_TRIM_FILE_MASK 0x3
>
> +/*
> + * Flags used by F2FS_IOC_SET_COMPRESS_OPTION_V2
> + */
> +#define COMPRESS_CHKSUM 0x0 /* enable chksum for compress file */
> +#define COMPRESS_LEVEL_OFFSET 8
> +#define COMPRESS_LEVEL_MASK GENMASK(15, COMPRESS_LEVEL_OFFSET)
> +#define COMPRESS_OPTION_MASK (COMPRESS_LEVEL_MASK | BIT(COMPRESS_CHKSUM))
> +#define GET_COMPRESS_LEVEL(x) (((x) & COMPRESS_LEVEL_MASK) >> COMPRESS_LEVEL_OFFSET)
> +
> struct f2fs_gc_range {
> __u32 sync;
> __u64 start;
> @@ -96,4 +107,14 @@ struct f2fs_comp_option {
> __u8 log_cluster_size;
> };
>
> +struct f2fs_comp_option_v2 {
> + union {
> + struct {
> + __u8 algorithm;
> + __u8 log_cluster_size;
> + __u16 compress_flag;
> + };
> + struct f2fs_comp_option option;
> + };
> +};
It looks using union may simply the implementation, but readability of new structure
becomes worse, since this structure will be exposed to user as an uapi interface, I
guess we'd better to consider more about its readability, thought?
Thanks,
> #endif /* _UAPI_LINUX_F2FS_H */
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