[PATCH 1/5] block/loop: implement REQ_FLUSH/FUA support
From: Tejun Heo <tj@kernel.org>
Date: 2010-08-16 16:51:59
Also in:
linux-fsdevel, linux-raid, linux-scsi, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
From: Tejun Heo <redacted> Deprecate REQ_HARDBARRIER and implement REQ_FLUSH/FUA instead. Also, instead of checking file->f_op->fsync() directly, look at the value of vfs_fsync() and ignore -EINVAL return. Signed-off-by: Tejun Heo <tj@kernel.org> --- drivers/block/loop.c | 18 +++++++++--------- 1 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 953d1e1..5d27bc6 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c@@ -477,17 +477,17 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio) pos = ((loff_t) bio->bi_sector << 9) + lo->lo_offset; if (bio_rw(bio) == WRITE) { - bool barrier = (bio->bi_rw & REQ_HARDBARRIER); struct file *file = lo->lo_backing_file; - if (barrier) { - if (unlikely(!file->f_op->fsync)) { - ret = -EOPNOTSUPP; - goto out; - } + /* REQ_HARDBARRIER is deprecated */ + if (bio->bi_rw & REQ_HARDBARRIER) { + ret = -EOPNOTSUPP; + goto out; + } + if (bio->bi_rw & REQ_FLUSH) { ret = vfs_fsync(file, 0); - if (unlikely(ret)) { + if (unlikely(ret && ret != -EINVAL)) { ret = -EIO; goto out; }
@@ -495,9 +495,9 @@ static int do_bio_filebacked(struct loop_device *lo, struct bio *bio) ret = lo_send(lo, bio, pos); - if (barrier && !ret) { + if ((bio->bi_rw & REQ_FUA) && !ret) { ret = vfs_fsync(file, 0); - if (unlikely(ret)) + if (unlikely(ret && ret != -EINVAL)) ret = -EIO; } } else
--
1.7.1