fs: Export generic_fadvise()

commit cf1ea0592dbf109e7e7935b7d5b1a47a1ba04174 upstream.

Filesystems will need to call this function from their fadvise handlers.

CC: stable@vger.kernel.org
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>

include/linux/fs.h

@@ -3495,5 +3495,7 @@ extern void inode_nohighmem(struct inode *inode);
 /* mm/fadvise.c */
 extern int vfs_fadvise(struct file *file, loff_t offset, loff_t len,
 		       int advice);
+extern int generic_fadvise(struct file *file, loff_t offset, loff_t len,
+			   int advice);
 
 #endif /* _LINUX_FS_H */

mm/fadvise.c

@@ -27,8 +27,7 @@
  * deactivate the pages and clear PG_Referenced.
  */
 
-static int generic_fadvise(struct file *file, loff_t offset, loff_t len,
-			   int advice)
+int generic_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
 {
 	struct inode *inode;
 	struct address_space *mapping;
@@ -178,6 +177,7 @@ static int generic_fadvise(struct file *file, loff_t offset, loff_t len,
 	}
 	return 0;
 }
+EXPORT_SYMBOL(generic_fadvise);
 
 int vfs_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
 {