linux-kernel - [PATCH 3/4] direct-io: add a "IO for kernel" flag to kiocb

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Date:	Tue, 18 Aug 2009 10:35:00 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	zach.brown@...cle.com, hch@...radead.org,
	Jens Axboe <jens.axboe@...cle.com>
Subject: [PATCH 3/4] direct-io: add a "IO for kernel" flag to kiocb

Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
---
 fs/direct-io.c      |   12 +++++++++++-
 include/linux/aio.h |    3 +++
 2 files changed, 14 insertions(+), 1 deletions(-)

diff --git a/fs/direct-io.c b/fs/direct-io.c
index 22a945b..0e923f2 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -117,6 +117,7 @@ struct dio {
 	struct kiocb *iocb;		/* kiocb */
 	int is_async;			/* is IO async ? */
 	int io_error;			/* IO error in completion path */
+	int is_kernel;
 	ssize_t result;                 /* IO result */
 };
 
@@ -336,7 +337,7 @@ static int dio_bio_complete(struct dio *dio, struct bio *bio)
 
 	if (dio->is_async && dio->rw == READ) {
 		bio_check_pages_dirty(bio);	/* transfers ownership */
-	} else {
+	} else if (!dio->is_kernel) {
 		for (page_no = 0; page_no < bio->bi_vcnt; page_no++) {
 			struct page *page = bvec[page_no].bv_page;
 
@@ -345,6 +346,14 @@ static int dio_bio_complete(struct dio *dio, struct bio *bio)
 			page_cache_release(page);
 		}
 		bio_put(bio);
+	} else {
+		for (page_no = 0; page_no < bio->bi_vcnt; page_no++) {
+			struct page *page = bvec[page_no].bv_page;
+
+			if (!dio->io_error)
+				SetPageUptodate(page);
+		}
+		bio_put(bio);
 	}
 	return uptodate ? 0 : -EIO;
 }
@@ -1103,6 +1112,7 @@ __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
 	 */
 	dio->is_async = !is_sync_kiocb(iocb) && !((rw & WRITE) &&
 		(end > i_size_read(inode)));
+	dio->is_kernel = kiocbIsKernel(iocb);
 
 	retval = direct_io_worker(iocb, inode, args, blkbits, get_block, end_io,
 					dio);
diff --git a/include/linux/aio.h b/include/linux/aio.h
index 47f7d93..ce3f34b 100644
--- a/include/linux/aio.h
+++ b/include/linux/aio.h
@@ -34,6 +34,7 @@ struct kioctx;
 /* #define KIF_LOCKED		0 */
 #define KIF_KICKED		1
 #define KIF_CANCELLED		2
+#define KIF_KERNEL_PAGES	3
 
 #define kiocbTryLock(iocb)	test_and_set_bit(KIF_LOCKED, &(iocb)->ki_flags)
 #define kiocbTryKick(iocb)	test_and_set_bit(KIF_KICKED, &(iocb)->ki_flags)
@@ -41,6 +42,7 @@ struct kioctx;
 #define kiocbSetLocked(iocb)	set_bit(KIF_LOCKED, &(iocb)->ki_flags)
 #define kiocbSetKicked(iocb)	set_bit(KIF_KICKED, &(iocb)->ki_flags)
 #define kiocbSetCancelled(iocb)	set_bit(KIF_CANCELLED, &(iocb)->ki_flags)
+#define kiocbSetKernel(iocb)	set_bit(KIF_KERNEL_PAGES, &(iocb)->ki_flags)
 
 #define kiocbClearLocked(iocb)	clear_bit(KIF_LOCKED, &(iocb)->ki_flags)
 #define kiocbClearKicked(iocb)	clear_bit(KIF_KICKED, &(iocb)->ki_flags)
@@ -49,6 +51,7 @@ struct kioctx;
 #define kiocbIsLocked(iocb)	test_bit(KIF_LOCKED, &(iocb)->ki_flags)
 #define kiocbIsKicked(iocb)	test_bit(KIF_KICKED, &(iocb)->ki_flags)
 #define kiocbIsCancelled(iocb)	test_bit(KIF_CANCELLED, &(iocb)->ki_flags)
+#define kiocbIsKernel(iocb)	test_bit(KIF_KERNEL_PAGES, &(iocb)->ki_flags)
 
 /* is there a better place to document function pointer methods? */
 /**
-- 
1.6.4.53.g3f55e

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