[PATCH] add struct file* to ->direct_IO addr space op

This makes file credentials available to the ->direct_IO address space
operation by replacing its struct inode* argument with a struct file*
argument.  this patch is a prerequisite for NFS direct I/O support.  it
breaks the raw device driver.

drivers/char/raw.c

@@ -222,7 +222,7 @@ rw_raw_dev(int rw, struct file *filp, const struct iovec *iov, unsigned long nr_
 		count = inode->i_size - *offp;
 		nr_segs = iov_shorten((struct iovec *)iov, nr_segs, count);
 	}
-	ret = generic_file_direct_IO(rw, inode, iov, *offp, nr_segs);
+	ret = generic_file_direct_IO(rw, filp, iov, *offp, nr_segs);
 
 	if (ret > 0)
 		*offp += ret;

fs/block_dev.c

@@ -116,9 +116,11 @@ blkdev_get_blocks(struct inode *inode, sector_t iblock,
 }
 
 static int
-blkdev_direct_IO(int rw, struct inode *inode, const struct iovec *iov,
+blkdev_direct_IO(int rw, struct file *file, const struct iovec *iov,
 			loff_t offset, unsigned long nr_segs)
 {
+	struct inode *inode = file->f_dentry->d_inode->i_mapping->host;
+
 	return generic_direct_IO(rw, inode, iov, offset,
 				nr_segs, blkdev_get_blocks);
 }

fs/direct-io.c

@@ -646,14 +646,14 @@ generic_direct_IO(int rw, struct inode *inode, const struct iovec *iov,
 }
 
 ssize_t
-generic_file_direct_IO(int rw, struct inode *inode, const struct iovec *iov, 
+generic_file_direct_IO(int rw, struct file *file, const struct iovec *iov,
 	loff_t offset, unsigned long nr_segs)
 {
-	struct address_space *mapping = inode->i_mapping;
+	struct address_space *mapping = file->f_dentry->d_inode->i_mapping;
 	ssize_t retval;
 
-	retval = mapping->a_ops->direct_IO(rw, inode, iov, offset, nr_segs);
-	if (inode->i_mapping->nrpages)
-		invalidate_inode_pages2(inode->i_mapping);
+	retval = mapping->a_ops->direct_IO(rw, file, iov, offset, nr_segs);
+	if (mapping->nrpages)
+		invalidate_inode_pages2(mapping);
 	return retval;
 }

fs/ext2/inode.c

@@ -619,9 +619,11 @@ ext2_get_blocks(struct inode *inode, sector_t iblock, unsigned long max_blocks,
 }
 
 static int
-ext2_direct_IO(int rw, struct inode *inode, const struct iovec *iov,
+ext2_direct_IO(int rw, struct file *file, const struct iovec *iov,
 			loff_t offset, unsigned long nr_segs)
 {
+	struct inode *inode = file->f_dentry->d_inode->i_mapping->host;
+
 	return generic_direct_IO(rw, inode, iov,
 				offset, nr_segs, ext2_get_blocks);
 }

fs/ext3/inode.c

@@ -1399,10 +1399,11 @@ static int ext3_releasepage(struct page *page, int wait)
  * If the O_DIRECT write is intantiating holes inside i_size and the machine
  * crashes then stale disk data _may_ be exposed inside the file.
  */
-static int ext3_direct_IO(int rw, struct inode *inode,
+static int ext3_direct_IO(int rw, struct file *file,
 			const struct iovec *iov, loff_t offset,
 			unsigned long nr_segs)
 {
+	struct inode *inode = file->f_dentry->d_inode->i_mapping->host;
 	struct ext3_inode_info *ei = EXT3_I(inode);
 	handle_t *handle = NULL;
 	int ret;

fs/jfs/inode.c

@@ -310,9 +310,11 @@ static int jfs_bmap(struct address_space *mapping, long block)
 	return generic_block_bmap(mapping, block, jfs_get_block);
 }
 
-static int jfs_direct_IO(int rw, struct inode *inode, const struct iovec *iov, 
+static int jfs_direct_IO(int rw, struct file *file, const struct iovec *iov,
 			loff_t offset, unsigned long nr_segs)
 {
+	struct inode *inode = file->f_dentry->d_inode->i_mapping->host;
+
 	return generic_direct_IO(rw, inode, iov,
 				offset, nr_segs, jfs_get_blocks);
 }

fs/xfs/linux/xfs_aops.c

@@ -681,11 +681,13 @@ linvfs_get_blocks_direct(
 STATIC int
 linvfs_direct_IO(
 	int			rw,
-	struct inode		*inode,
+	struct file		*file,
 	const struct iovec	*iov,
 	loff_t			offset,
 	unsigned long		nr_segs)
 {
+	struct inode *inode = file->f_dentry->d_inode->i_mapping->host;
+
         return generic_direct_IO(rw, inode, iov, offset, nr_segs,
 					linvfs_get_blocks_direct);
 }

include/linux/fs.h

@@ -308,7 +308,8 @@ struct address_space_operations {
 	int (*bmap)(struct address_space *, long);
 	int (*invalidatepage) (struct page *, unsigned long);
 	int (*releasepage) (struct page *, int);
-	int (*direct_IO)(int, struct inode *, const struct iovec *iov, loff_t offset, unsigned long nr_segs);
+	int (*direct_IO)(int, struct file *, const struct iovec *iov,
+			loff_t offset, unsigned long nr_segs);
 };
 
 struct backing_dev_info;
@@ -1247,7 +1248,7 @@ ssize_t generic_file_write_nolock(struct file *file, const struct iovec *iov,
 				unsigned long nr_segs, loff_t *ppos);
 extern ssize_t generic_file_sendfile(struct file *, struct file *, loff_t *, size_t);
 extern void do_generic_file_read(struct file *, loff_t *, read_descriptor_t *, read_actor_t);
-extern ssize_t generic_file_direct_IO(int rw, struct inode *inode, 
+extern ssize_t generic_file_direct_IO(int rw, struct file *file,
 	const struct iovec *iov, loff_t offset, unsigned long nr_segs);
 extern int generic_direct_IO(int rw, struct inode *inode, const struct iovec 
 	*iov, loff_t offset, unsigned long nr_segs, get_blocks_t *get_blocks);

include/linux/nfs_fs.h

@@ -14,6 +14,7 @@
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #include <linux/wait.h>
+#include <linux/uio.h>
 
 #include <linux/nfs_fs_sb.h>
 
@@ -283,6 +284,12 @@ nfs_file_cred(struct file *file)
 	return cred;
 }
 
+/*
+ * linux/fs/nfs/direct.c
+ */
+extern int nfs_direct_IO(int, struct file *, const struct iovec *, loff_t,
+			unsigned long);
+
 /*
  * linux/fs/nfs/dir.c
  */

kernel/ksyms.c

@@ -192,6 +192,7 @@ EXPORT_SYMBOL(invalidate_bdev);
 EXPORT_SYMBOL(invalidate_inodes);
 EXPORT_SYMBOL(invalidate_device);
 EXPORT_SYMBOL(invalidate_inode_pages);
+EXPORT_SYMBOL_GPL(invalidate_inode_pages2);
 EXPORT_SYMBOL(truncate_inode_pages);
 EXPORT_SYMBOL(fsync_bdev);
 EXPORT_SYMBOL(permission);

mm/filemap.c

@@ -1158,7 +1158,7 @@ __generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
 				nr_segs = iov_shorten((struct iovec *)iov,
 							nr_segs, count);
 			}
-			retval = generic_file_direct_IO(READ, inode, 
+			retval = generic_file_direct_IO(READ, filp,
 					iov, pos, nr_segs);
 			if (retval > 0)
 				*ppos = pos + retval;
@@ -1840,7 +1840,7 @@ generic_file_write_nolock(struct file *file, const struct iovec *iov,
 		if (count != ocount)
 			nr_segs = iov_shorten((struct iovec *)iov,
 						nr_segs, count);
-		written = generic_file_direct_IO(WRITE, inode, 
+		written = generic_file_direct_IO(WRITE, file,
 					iov, pos, nr_segs);
 		if (written > 0) {
 			loff_t end = pos + written;