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Subject[RFC PATCH 1/2] f2fs: introduce F2FS_IOC_GET_COMPRESS_BLOCKS
Date
With this newly introduced interface, user can get block
number compression saved in target inode.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/f2fs.h | 1 +
fs/f2fs/file.c | 18 ++++++++++++++++++
2 files changed, 19 insertions(+)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 5d047c0bbbbb..15199df5d40a 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -426,6 +426,7 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
#define F2FS_IOC_GET_PIN_FILE _IOR(F2FS_IOCTL_MAGIC, 14, __u32)
#define F2FS_IOC_PRECACHE_EXTENTS _IO(F2FS_IOCTL_MAGIC, 15)
#define F2FS_IOC_RESIZE_FS _IOW(F2FS_IOCTL_MAGIC, 16, __u64)
+#define F2FS_IOC_GET_COMPRESS_BLOCKS _IOR(F2FS_IOCTL_MAGIC, 17, __u64)

#define F2FS_IOC_GET_VOLUME_NAME FS_IOC_GETFSLABEL
#define F2FS_IOC_SET_VOLUME_NAME FS_IOC_SETFSLABEL
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index efca4ed17b7d..235708c892af 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3401,6 +3401,21 @@ static int f2fs_set_volume_name(struct file *filp, unsigned long arg)
return err;
}

+static int f2fs_get_compress_blocks(struct file *filp, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+ __u64 blocks;
+
+ if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
+ return -EOPNOTSUPP;
+
+ if (!f2fs_compressed_file(inode))
+ return -EINVAL;
+
+ blocks = F2FS_I(inode)->i_compr_blocks;
+ return put_user(blocks, (u64 __user *)arg);
+}
+
long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
@@ -3479,6 +3494,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return f2fs_get_volume_name(filp, arg);
case F2FS_IOC_SET_VOLUME_NAME:
return f2fs_set_volume_name(filp, arg);
+ case F2FS_IOC_GET_COMPRESS_BLOCKS:
+ return f2fs_get_compress_blocks(filp, arg);
default:
return -ENOTTY;
}
@@ -3636,6 +3653,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case FS_IOC_MEASURE_VERITY:
case F2FS_IOC_GET_VOLUME_NAME:
case F2FS_IOC_SET_VOLUME_NAME:
+ case F2FS_IOC_GET_COMPRESS_BLOCKS:
break;
default:
return -ENOIOCTLCMD;
--
2.18.0.rc1
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