diff options
| author | Tejun Heo <tj@kernel.org> | 2010-09-03 13:56:17 +0400 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-09-10 14:35:37 +0400 |
| commit | 1e87901e189c8f01750d67485009fe3827c691bf (patch) | |
| tree | 13a8378830f866aff8461fb47ddfed207c8d2bd2 | |
| parent | 4fed947cb311e5aa51781d316cefca836352f6ce (diff) | |
| download | linux-1e87901e189c8f01750d67485009fe3827c691bf.tar.xz | |
block: filter flush bio's in __generic_make_request()
There are a number of make_request based drivers which don't support
cache flushes. Filter out flush bio's in __generic_make_request() so
that they don't have to worry about them. All FLUSH/FUA requests with
data are converted to regular IO requests and empty ones are completed
immediately.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
| -rw-r--r-- | block/blk-core.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 18455c4f618a..495bdc4a23da 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1509,6 +1509,19 @@ static inline void __generic_make_request(struct bio *bio) if (bio_check_eod(bio, nr_sectors)) goto end_io; + /* + * Filter flush bio's early so that make_request based + * drivers without flush support don't have to worry + * about them. + */ + if ((bio->bi_rw & (REQ_FLUSH | REQ_FUA)) && !q->flush_flags) { + bio->bi_rw &= ~(REQ_FLUSH | REQ_FUA); + if (!nr_sectors) { + err = 0; + goto end_io; + } + } + if ((bio->bi_rw & REQ_DISCARD) && (!blk_queue_discard(q) || ((bio->bi_rw & REQ_SECURE) && |