[PATCH 1/3] block: introduce REQ_DIRECT to track direct io bio
From: Andrea Righi <hidden>
Date: 2011-02-28 10:17:12
Also in:
lkml
Subsystem:
block layer, filesystems (vfs and infrastructure), the rest · Maintainers:
Jens Axboe, Alexander Viro, Christian Brauner, Linus Torvalds
Introduce a new flag to identify if a bio has been generated for a direct IO operation. This flag is used by the blkio controller to identify if a write IO request has been issued by the current task and can be limited directly or if it has been generated from another IO context, as a result of a buffered IO operation. Signed-off-by: Andrea Righi <redacted> --- fs/direct-io.c | 1 + include/linux/blk_types.h | 2 ++ 2 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/fs/direct-io.c b/fs/direct-io.c
index b044705..fe364a4 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c@@ -361,6 +361,7 @@ static void dio_bio_submit(struct dio *dio) unsigned long flags; bio->bi_private = dio; + bio->bi_rw |= REQ_DIRECT; spin_lock_irqsave(&dio->bio_lock, flags); dio->refcount++;
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index 46ad519..2f98c03 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h@@ -130,6 +130,7 @@ enum rq_flag_bits { /* bio only flags */ __REQ_UNPLUG, /* unplug the immediately after submission */ __REQ_RAHEAD, /* read ahead, can fail anytime */ + __REQ_DIRECT, /* direct io request */ __REQ_THROTTLED, /* This bio has already been subjected to * throttling rules. Don't do it again. */
@@ -173,6 +174,7 @@ enum rq_flag_bits { #define REQ_UNPLUG (1 << __REQ_UNPLUG) #define REQ_RAHEAD (1 << __REQ_RAHEAD) #define REQ_THROTTLED (1 << __REQ_THROTTLED) +#define REQ_DIRECT (1 << __REQ_DIRECT) #define REQ_SORTED (1 << __REQ_SORTED) #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
--
1.7.1
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