dio: add sdio_init() helper function

This adds a helper function which initializes the sdio structure.
We'll be calling this from another entry point in an upcoming patch.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

diff --git a/fs/direct-io.c b/fs/direct-io.c
index f8631731d59d147b3fbbbc1998cb399aacbd4742..9462ed92371e7873302f24efa0e8e5d21f048796 100644 (file)
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -1097,6 +1097,27 @@ static struct dio *dio_alloc_init(int flags, int rw, struct kiocb *iocb,
        return dio;
 }
 
+static void sdio_init(struct dio_submit *sdio, struct inode *inode,
+                     loff_t offset, unsigned blkbits, get_block_t get_block,
+                     dio_submit_t *submit_io)
+{
+       sdio->blkbits = blkbits;
+       sdio->blkfactor = inode->i_blkbits - blkbits;
+       sdio->block_in_file = offset >> blkbits;
+
+       sdio->get_block = get_block;
+       sdio->submit_io = submit_io;
+       sdio->final_block_in_bio = -1;
+       sdio->next_block_for_io = -1;
+
+       /*
+        * In case of non-aligned buffers, we may need 2 more
+        * pages since we need to zero out first and last block.
+        */
+       if (unlikely(sdio->blkfactor))
+               sdio->pages_in_io = 2;
+}
+
 /*
  * This is a library function for use by filesystem drivers.
  *
@@ -1186,21 +1207,7 @@ do_blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
 
        retval = 0;
 
-       sdio.blkbits = blkbits;
-       sdio.blkfactor = inode->i_blkbits - blkbits;
-       sdio.block_in_file = offset >> blkbits;
-
-       sdio.get_block = get_block;
-       sdio.submit_io = submit_io;
-       sdio.final_block_in_bio = -1;
-       sdio.next_block_for_io = -1;
-
-       /*
-        * In case of non-aligned buffers, we may need 2 more
-        * pages since we need to zero out first and last block.
-        */
-       if (unlikely(sdio.blkfactor))
-               sdio.pages_in_io = 2;
+       sdio_init(&sdio, inode, offset, blkbits, get_block, submit_io);
 
        for (seg = 0; seg < nr_segs; seg++) {
                user_addr = (unsigned long)iov[seg].iov_base;