kernel.git/fs/bio.c, branch linux-2.6.28.y

block: mark bio_split_pool static

2008-10-09T06:57:05Z

Since all bio_split calls refer the same single bio_split_pool, the bio_split function can use bio_split_pool directly instead of the mempool_t parameter; then the mempool_t parameter can be removed from bio_split param list, and bio_split_pool is only referred in fs/bio.c file, can be marked static. Signed-off-by: Denis ChengRq Signed-off-by: Jens Axboe

block: Find bio sector offset given idx and offset

2008-10-09T06:56:22Z

Helper function to find the sector offset in a bio given bvec index and page offset. Signed-off-by: Martin K. Petersen Signed-off-by: Jens Axboe

block: add bio_kmalloc()

2008-10-09T06:56:17Z

Not all callers need (or want!) the mempool backing guarentee, it essentially means that you can only use bio_alloc() for short allocations and not for preallocating some bio's at setup or init time. So add bio_kmalloc() which does the same thing as bio_alloc(), except it just uses kmalloc() as the backing instead of the bio mempools. Signed-off-by: Jens Axboe

block: make blk_rq_map_user take a NULL user-space buffer

2008-10-09T06:56:11Z

This patch changes blk_rq_map_user to accept a NULL user-space buffer with a READ command if rq_map_data is not NULL. Thus a caller can pass page frames to lk_rq_map_user to just set up a request and bios with page frames propely. bio_uncopy_user (called via blk_rq_unmap_user) doesn't copy data to user space with such request. Signed-off-by: FUJITA Tomonori Signed-off-by: Jens Axboe

bio: convert bio_copy_kern to use bio_copy_user

2008-10-09T06:56:10Z

bio_copy_kern and bio_copy_user are very similar. This converts bio_copy_kern to use bio_copy_user. Signed-off-by: FUJITA Tomonori Cc: Jens Axboe Signed-off-by: Jens Axboe

block: introduce struct rq_map_data to use reserved pages

2008-10-09T06:56:10Z

This patch introduces struct rq_map_data to enable bio_copy_use_iov() use reserved pages. Currently, bio_copy_user_iov allocates bounce pages but drivers/scsi/sg.c wants to allocate pages by itself and use them. struct rq_map_data can be used to pass allocated pages to bio_copy_user_iov. The current users of bio_copy_user_iov simply passes NULL (they don't want to use pre-allocated pages). Signed-off-by: FUJITA Tomonori Cc: Jens Axboe Cc: Douglas Gilbert Cc: Mike Christie Cc: James Bottomley Signed-off-by: Jens Axboe

block: add gfp_mask argument to blk_rq_map_user and blk_rq_map_user_iov

2008-10-09T06:56:10Z

Currently, blk_rq_map_user and blk_rq_map_user_iov always do GFP_KERNEL allocation. This adds gfp_mask argument to blk_rq_map_user and blk_rq_map_user_iov so sg can use it (sg always does GFP_ATOMIC allocation). Signed-off-by: FUJITA Tomonori Signed-off-by: Douglas Gilbert Cc: Mike Christie Cc: James Bottomley Signed-off-by: Jens Axboe

block: add support for IO CPU affinity

2008-10-09T06:56:09Z

This patch adds support for controlling the IO completion CPU of either all requests on a queue, or on a per-request basis. We export a sysfs variable (rq_affinity) which, if set, migrates completions of requests to the CPU that originally submitted it. A bio helper (bio_set_completion_cpu()) is also added, so that queuers can ask for completion on that specific CPU. In testing, this has been show to cut the system time by as much as 20-40% on synthetic workloads where CPU affinity is desired. This requires a little help from the architecture, so it'll only work as designed for archs that are using the new generic smp helper infrastructure. Signed-off-by: Jens Axboe

drop vmerge accounting

2008-10-09T06:56:03Z

Remove hw_segments field from struct bio and struct request. Without virtual merge accounting they have no purpose. Signed-off-by: Mikulas Patocka Signed-off-by: Jens Axboe

block: drop virtual merging accounting

2008-10-09T06:56:03Z

Remove virtual merge accounting. Signed-off-by: Mikulas Patocka Signed-off-by: Jens Axboe