f2fs: add a f2fs_ prefix to punch_hole() and expand_inode_data()

For example, f2fs_collapse_range(), f2fs_collapse_range(),
f2fs_insert_range(), the functions used in f2fs_fallocate()
are all prefixed with f2fs_, so let's keep the name consistent.
Signed-off-by: Yangtao Li <frank.li@vivo.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -1110,7 +1110,7 @@ int f2fs_truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
 	return 0;
 }
 
-static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
+static int f2fs_punch_hole(struct inode *inode, loff_t offset, loff_t len)
 {
 	pgoff_t pg_start, pg_end;
 	loff_t off_start, off_end;
@@ -1682,7 +1682,7 @@ static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
 	return ret;
 }
 
-static int expand_inode_data(struct inode *inode, loff_t offset,
+static int f2fs_expand_inode_data(struct inode *inode, loff_t offset,
 					loff_t len, int mode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
@@ -1830,7 +1830,7 @@ static long f2fs_fallocate(struct file *file, int mode,
 		if (offset >= inode->i_size)
 			goto out;
 
-		ret = punch_hole(inode, offset, len);
+		ret = f2fs_punch_hole(inode, offset, len);
 	} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
 		ret = f2fs_collapse_range(inode, offset, len);
 	} else if (mode & FALLOC_FL_ZERO_RANGE) {
@@ -1838,7 +1838,7 @@ static long f2fs_fallocate(struct file *file, int mode,
 	} else if (mode & FALLOC_FL_INSERT_RANGE) {
 		ret = f2fs_insert_range(inode, offset, len);
 	} else {
-		ret = expand_inode_data(inode, offset, len, mode);
+		ret = f2fs_expand_inode_data(inode, offset, len, mode);
 	}
 
 	if (!ret) {