linux.git/block/blk-map.c, branch v2.6.29

[SCSI] block: make blk_rq_map_user take a NULL user-space buffer for WRITE

2009-01-02T17:10:35+00:00

The commit 818827669d85b84241696ffef2de485db46b0b5e (block: make
blk_rq_map_user take a NULL user-space buffer) extended
blk_rq_map_user to accept a NULL user-space buffer with a READ
command. It was necessary to convert sg to use the block layer mapping
API.

This patch extends blk_rq_map_user again for a WRITE command. It is
necessary to convert st and osst drivers to use the block layer
apping API.

Signed-off-by: FUJITA Tomonori 
Acked-by: Jens Axboe 
Signed-off-by: James Bottomley

[SCSI] block: fix the partial mappings with struct rq_map_data

2009-01-02T17:10:08+00:00

This fixes bio_copy_user_iov to properly handle the partial mappings
with struct rq_map_data (which only sg uses for now but st and osst
will shortly). It adds the offset member to struct rq_map_data and
changes blk_rq_map_user to update it so that bio_copy_user_iov can add
an appropriate page frame via bio_add_pc_page().

Signed-off-by: FUJITA Tomonori 
Acked-by: Jens Axboe 
Signed-off-by: James Bottomley

When block layer fails to map iov, it calls bio_unmap_user to undo

2008-12-03T11:41:20+00:00

mapping.  Which is good if pages were mapped - but if they were provided
by someone else and just copied then bad things happen - pages are
released once here, and once by caller, leading to user triggerable BUG
at include/linux/mm.h:246.

Signed-off-by: Petr Vandrovec 
Signed-off-by: Jens Axboe

block: hold extra reference to bio in blk_rq_map_user_iov()

2008-11-18T14:08:56+00:00

If the size passed in is OK but we end up mapping too many segments,
we call the unmap path directly like from IO completion. But from IO
completion we have an extra reference to the bio, so this error case
goes OOPS when it attempts to free and already free bio.

Fix it by getting an extra reference to the bio before calling the
unmap failure case.

Reported-by: Petr Vandrovec 

Signed-off-by: Jens Axboe

block: make blk_rq_map_user take a NULL user-space buffer

2008-10-09T06:56:11+00:00

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

block: add blk_rq_aligned helper function

2008-10-09T06:56:11+00:00

This adds blk_rq_aligned helper function to see if alignment and
padding requirement is satisfied for DMA transfer. This also converts
blk_rq_map_kern and __blk_rq_map_user to use the helper function.

Signed-off-by: FUJITA Tomonori 
Cc: Jens Axboe 
Signed-off-by: Jens Axboe

block: introduce struct rq_map_data to use reserved pages

2008-10-09T06:56:10+00:00

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

2008-10-09T06:56:10+00:00

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

Add some block/ source files to the kernel-api docbook. Fix kernel-doc notation in them as needed. Fix changed function parameter names. Fix typos/spellos. In comments, change REQ_SPECIAL to REQ_TYPE_SPECIAL and REQ_BLOCK_PC to REQ_TYPE_BLOCK_PC.

2008-10-09T06:56:03+00:00

Signed-off-by: Randy Dunlap 
Signed-off-by: Jens Axboe

block/blk-map.c: use the new object_is_on_stack() helper

2008-07-26T19:00:02+00:00

Signed-off-by: FUJITA Tomonori 
Cc: Bartlomiej Zolnierkiewicz 
Cc: Thomas Bogendoerfer 
Cc: Tejun Heo 
Cc: Jens Axboe 
Cc: James Bottomley 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds