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authorLinus Torvalds <torvalds@linux-foundation.org>2008-04-21 16:03:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-21 16:03:40 -0700
commit548453fd107f789f5f1bc2dc13cc432ceb3b5efd (patch)
treedc5a62d49260d66b7390ef110113134e3bef9152 /block/blk-map.c
parent9fd91217b15751997cab35ad309b37b44eaa6774 (diff)
parentfb199746303a6bfd6121834ec9e810471185c530 (diff)
downloadlinux-548453fd107f789f5f1bc2dc13cc432ceb3b5efd.tar.gz
Merge branch 'for-2.6.26' of git://git.kernel.dk/linux-2.6-block
* 'for-2.6.26' of git://git.kernel.dk/linux-2.6-block: block: fix blk_register_queue() return value block: fix memory hotplug and bouncing in block layer block: replace remaining __FUNCTION__ occurrences Kconfig: clean up block/Kconfig help descriptions cciss: fix warning oops on rmmod of driver cciss: Fix race between disk-adding code and interrupt handler block: move the padding adjustment to blk_rq_map_sg block: add bio_copy_user_iov support to blk_rq_map_user_iov block: convert bio_copy_user to bio_copy_user_iov loop: manage partitions in disk image cdrom: use kmalloced buffers instead of buffers on stack cdrom: make unregister_cdrom() return void cdrom: use list_head for cdrom_device_info list cdrom: protect cdrom_device_info list by mutex cdrom: cleanup hardcoded error-code cdrom: remove ifdef CONFIG_SYSCTL
Diffstat (limited to 'block/blk-map.c')
-rw-r--r--block/blk-map.c46
1 files changed, 22 insertions, 24 deletions
diff --git a/block/blk-map.c b/block/blk-map.c
index c07d9c8317f4..3c942bd6422a 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -5,6 +5,7 @@
#include <linux/module.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
+#include <scsi/sg.h> /* for struct sg_iovec */
#include "blk.h"
@@ -140,25 +141,8 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
ubuf += ret;
}
- /*
- * __blk_rq_map_user() copies the buffers if starting address
- * or length isn't aligned to dma_pad_mask. As the copied
- * buffer is always page aligned, we know that there's enough
- * room for padding. Extend the last bio and update
- * rq->data_len accordingly.
- *
- * On unmap, bio_uncopy_user() will use unmodified
- * bio_map_data pointed to by bio->bi_private.
- */
- if (len & q->dma_pad_mask) {
- unsigned int pad_len = (q->dma_pad_mask & ~len) + 1;
- struct bio *tail = rq->biotail;
-
- tail->bi_io_vec[tail->bi_vcnt - 1].bv_len += pad_len;
- tail->bi_size += pad_len;
-
- rq->extra_len += pad_len;
- }
+ if (!bio_flagged(bio, BIO_USER_MAPPED))
+ rq->cmd_flags |= REQ_COPY_USER;
rq->buffer = rq->data = NULL;
return 0;
@@ -194,15 +178,26 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
struct sg_iovec *iov, int iov_count, unsigned int len)
{
struct bio *bio;
+ int i, read = rq_data_dir(rq) == READ;
+ int unaligned = 0;
if (!iov || iov_count <= 0)
return -EINVAL;
- /* we don't allow misaligned data like bio_map_user() does. If the
- * user is using sg, they're expected to know the alignment constraints
- * and respect them accordingly */
- bio = bio_map_user_iov(q, NULL, iov, iov_count,
- rq_data_dir(rq) == READ);
+ for (i = 0; i < iov_count; i++) {
+ unsigned long uaddr = (unsigned long)iov[i].iov_base;
+
+ if (uaddr & queue_dma_alignment(q)) {
+ unaligned = 1;
+ break;
+ }
+ }
+
+ if (unaligned || (q->dma_pad_mask & len))
+ bio = bio_copy_user_iov(q, iov, iov_count, read);
+ else
+ bio = bio_map_user_iov(q, NULL, iov, iov_count, read);
+
if (IS_ERR(bio))
return PTR_ERR(bio);
@@ -212,6 +207,9 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq,
return -EINVAL;
}
+ if (!bio_flagged(bio, BIO_USER_MAPPED))
+ rq->cmd_flags |= REQ_COPY_USER;
+
bio_get(bio);
blk_rq_bio_prep(q, rq, bio);
rq->buffer = rq->data = NULL;