diff options
| author | Andrew Morton <akpm@zip.com.au> | 2002-05-19 02:22:01 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@conectiva.com.br> | 2002-05-19 02:22:01 -0700 |
| commit | 1f6acea0de867d7f5e5a43ba43cf3be744da412c (patch) | |
| tree | 895e785d534e0b4965559493e80b361e9c4d0f80 /include/linux/blkdev.h | |
| parent | 610c5ab86ed7e1647ba3cedd20ab0f946b264c9d (diff) | |
[PATCH] pdflush exclusion infrastructure
Collision avoidance for pdflush threads.
Turns the request_queue-based `unsigned long ra_pages' into a structure
which contains ra_pages as well as a longword.
That longword is used to record the fact that a pdflush thread is
currently writing something back against this request_queue.
Avoids the situation where several pdflush threads are sleeping on the
same request_queue.
This patch provides only the infrastructure for the pdflush exclusion.
This infrastructure gets used in pdflush-single.patch
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index d8175ccc104c..ac373e6a2454 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -7,6 +7,7 @@ #include <linux/tqueue.h> #include <linux/list.h> #include <linux/pagemap.h> +#include <linux/backing-dev.h> #include <asm/scatterlist.h> @@ -162,11 +163,7 @@ struct request_queue make_request_fn *make_request_fn; prep_rq_fn *prep_rq_fn; - /* - * The VM-level readahead tunable for this device. In - * units of PAGE_CACHE_SIZE pages. - */ - unsigned long ra_pages; + struct backing_dev_info backing_dev_info; /* * The queue owner gets to use this for whatever they like. @@ -328,7 +325,7 @@ extern void blk_queue_hardsect_size(request_queue_t *q, unsigned short); extern void blk_queue_segment_boundary(request_queue_t *q, unsigned long); extern void blk_queue_assign_lock(request_queue_t *q, spinlock_t *); extern void blk_queue_prep_rq(request_queue_t *q, prep_rq_fn *pfn); -extern unsigned long *blk_get_ra_pages(struct block_device *bdev); +extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); extern int blk_rq_map_sg(request_queue_t *, struct request *, struct scatterlist *); extern void blk_dump_rq_flags(struct request *, char *); |