From: Daeho Jeong <[email protected]> Added a new F2FS_IOC_SET_COMPRESS_OPTION ioctl to change file compression option of a file.
Signed-off-by: Daeho Jeong <[email protected]> --- fs/f2fs/f2fs.h | 2 ++ fs/f2fs/file.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index a33c90cf979b..5ee8a4859b62 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. diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 7e64259f6f5e..6c265c66ddd4 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -3963,6 +3963,59 @@ 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; + int writecount; + + if (!f2fs_sb_has_compression(sbi)) + return -EOPNOTSUPP; + + if (!f2fs_compressed_file(inode) || IS_IMMUTABLE(inode)) + return -EINVAL; + + if (f2fs_readonly(sbi->sb)) + return -EROFS; + + 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 || + option.algorithm >= COMPRESS_MAX) + return -EINVAL; + + ret = mnt_want_write_file(filp); + if (ret) + return ret; + + inode_lock(inode); + + writecount = atomic_read(&inode->i_writecount); + if ((filp->f_mode & FMODE_WRITE && writecount != 1) || + (!(filp->f_mode & FMODE_WRITE) && writecount)) { + ret = -EBUSY; + goto out; + } + + if (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); + 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 +4106,8 @@ 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 +4279,7 @@ 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; -- 2.28.0.1011.ga647a8990f-goog
