[PATCH 2/2] f2fs: add F2FS_IOC_SET_COMPRESS_OPTION ioctl

From: Daeho Jeong
Date: Mon Oct 12 2020 - 22:42:16 EST


From: Daeho Jeong <daehojeong@xxxxxxxxxx>

Added a new F2FS_IOC_SET_COMPRESS_OPTION ioctl to change file
compression option of a file.

Signed-off-by: Daeho Jeong <daehojeong@xxxxxxxxxx>
---
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