ext2fs: add readahead method to improve scanning

[tools/e2fsprogs.git] / lib / ext2fs / ext2_io.h

diff --git a/lib/ext2fs/ext2_io.h b/lib/ext2fs/ext2_io.h
index 1894fb8..93fd397 100644 (file)
--- a/lib/ext2fs/ext2_io.h
+++ b/lib/ext2fs/ext2_io.h
@@ -90,6 +90,8 @@ struct struct_io_manager {
                                        int count, const void *data);
        errcode_t (*discard)(io_channel channel, unsigned long long block,
                             unsigned long long count);
+       errcode_t (*readahead)(io_channel channel, unsigned long block,
+                              int count);
        long    reserved[16];
 };
 
@@ -103,6 +105,7 @@ struct struct_io_manager {
 #define io_channel_close(c)            ((c)->manager->close((c)))
 #define io_channel_set_blksize(c,s)    ((c)->manager->set_blksize((c),s))
 #define io_channel_read_blk(c,b,n,d)   ((c)->manager->read_blk((c),b,n,d))
+#define io_channel_readahead(c,b,n)    ((c)->manager->readahead((c),b,n))
 #define io_channel_write_blk(c,b,n,d)  ((c)->manager->write_blk((c),b,n,d))
 #define io_channel_flush(c)            ((c)->manager->flush((c)))
 #define io_channel_bumpcount(c)                ((c)->refcount++)