linux-2.6.25/__blk_queue_bounce()
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開始行:
*参照元 [#hb909383]
#backlinks
*説明 [#n7c1bfc0]
-パス: [[linux-2.6.25/linux-2.6.25/mm/bounce.c]]
-FIXME: これは何？
--説明
**引数 [#q2201762]
-struct request_queue *q
--
-struct bio **bio_orig
--
-mempool_t *pool
--
**返り値 [#m00afb66]
-なし
**参考 [#yb91ccef]
*実装 [#ydc6bd75]
static void __blk_queue_bounce(struct request_queue *q, ...
mempool_t *pool)
{
struct page *page;
struct bio *bio = NULL;
int i, rw = bio_data_dir(*bio_orig);
struct bio_vec *to, *from;
-
--[[linux-2.6.25/page]]
--[[linux-2.6.25/bio]]
--[[linux-2.6.25/bio_vec]]
--[[linux-2.6.25/bio_data_dir()]]
bio_for_each_segment(from, *bio_orig, i) {
page = from->bv_page;
-
--[[linux-2.6.25/bio_for_each_segment()]]
/*
* is destination page below bounce pfn?
*/
if (page_to_pfn(page) <= q->bounce_pfn)
continue;
-
--[[linux-2.6.25/page_to_pfn()]]
/*
* irk, bounce it
*/
if (!bio)
bio = bio_alloc(GFP_NOIO, (*bio_...
-
--[[linux-2.6.25/bio_alloc()]]
to = bio->bi_io_vec + i;
to->bv_page = mempool_alloc(pool, q->bou...
to->bv_len = from->bv_len;
to->bv_offset = from->bv_offset;
inc_zone_page_state(to->bv_page, NR_BOUN...
-
--[[linux-2.6.25/mempool_alloc()]]
--[[linux-2.6.25/inc_zone_page_state()]]
if (rw == WRITE) {
char *vto, *vfrom;
flush_dcache_page(from->bv_page);
vto = page_address(to->bv_page) ...
vfrom = kmap(from->bv_page) + fr...
memcpy(vto, vfrom, to->bv_len);
kunmap(from->bv_page);
-
--[[linux-2.6.25/flush_dcache_page()]]
--[[linux-2.6.25/page_address()]]
--[[linux-2.6.25/kmap()]]
--[[linux-2.6.25/memcpy()]]
--[[linux-2.6.25/kunmap()]]
}
}
/*
* no pages bounced
*/
if (!bio)
return;
blk_add_trace_bio(q, *bio_orig, BLK_TA_BOUNCE);
-
--[[linux-2.6.25/blk_add_trace_bio()]]
/*
* at least one page was bounced, fill in possib...
* pages
*/
__bio_for_each_segment(from, *bio_orig, i, 0) {
-
--[[linux-2.6.25/__bio_for_each_segment()]]
to = bio_iovec_idx(bio, i);
if (!to->bv_page) {
to->bv_page = from->bv_page;
to->bv_len = from->bv_len;
to->bv_offset = from->bv_offset;
}
-
--[[linux-2.6.25/bio_iovec_idx()]]
}
bio->bi_bdev = (*bio_orig)->bi_bdev;
bio->bi_flags |= (1 << BIO_BOUNCED);
bio->bi_sector = (*bio_orig)->bi_sector;
bio->bi_rw = (*bio_orig)->bi_rw;
bio->bi_vcnt = (*bio_orig)->bi_vcnt;
bio->bi_idx = (*bio_orig)->bi_idx;
bio->bi_size = (*bio_orig)->bi_size;
if (pool == page_pool) {
bio->bi_end_io = bounce_end_io_write;
if (rw == READ)
bio->bi_end_io = bounce_end_io_r...
} else {
bio->bi_end_io = bounce_end_io_write_isa;
if (rw == READ)
bio->bi_end_io = bounce_end_io_r...
}
bio->bi_private = *bio_orig;
*bio_orig = bio;
}
*コメント [#n2353ac7]
終了行:
*参照元 [#hb909383]
#backlinks
*説明 [#n7c1bfc0]
-パス: [[linux-2.6.25/linux-2.6.25/mm/bounce.c]]
-FIXME: これは何？
--説明
**引数 [#q2201762]
-struct request_queue *q
--
-struct bio **bio_orig
--
-mempool_t *pool
--
**返り値 [#m00afb66]
-なし
**参考 [#yb91ccef]
*実装 [#ydc6bd75]
static void __blk_queue_bounce(struct request_queue *q, ...
mempool_t *pool)
{
struct page *page;
struct bio *bio = NULL;
int i, rw = bio_data_dir(*bio_orig);
struct bio_vec *to, *from;
-
--[[linux-2.6.25/page]]
--[[linux-2.6.25/bio]]
--[[linux-2.6.25/bio_vec]]
--[[linux-2.6.25/bio_data_dir()]]
bio_for_each_segment(from, *bio_orig, i) {
page = from->bv_page;
-
--[[linux-2.6.25/bio_for_each_segment()]]
/*
* is destination page below bounce pfn?
*/
if (page_to_pfn(page) <= q->bounce_pfn)
continue;
-
--[[linux-2.6.25/page_to_pfn()]]
/*
* irk, bounce it
*/
if (!bio)
bio = bio_alloc(GFP_NOIO, (*bio_...
-
--[[linux-2.6.25/bio_alloc()]]
to = bio->bi_io_vec + i;
to->bv_page = mempool_alloc(pool, q->bou...
to->bv_len = from->bv_len;
to->bv_offset = from->bv_offset;
inc_zone_page_state(to->bv_page, NR_BOUN...
-
--[[linux-2.6.25/mempool_alloc()]]
--[[linux-2.6.25/inc_zone_page_state()]]
if (rw == WRITE) {
char *vto, *vfrom;
flush_dcache_page(from->bv_page);
vto = page_address(to->bv_page) ...
vfrom = kmap(from->bv_page) + fr...
memcpy(vto, vfrom, to->bv_len);
kunmap(from->bv_page);
-
--[[linux-2.6.25/flush_dcache_page()]]
--[[linux-2.6.25/page_address()]]
--[[linux-2.6.25/kmap()]]
--[[linux-2.6.25/memcpy()]]
--[[linux-2.6.25/kunmap()]]
}
}
/*
* no pages bounced
*/
if (!bio)
return;
blk_add_trace_bio(q, *bio_orig, BLK_TA_BOUNCE);
-
--[[linux-2.6.25/blk_add_trace_bio()]]
/*
* at least one page was bounced, fill in possib...
* pages
*/
__bio_for_each_segment(from, *bio_orig, i, 0) {
-
--[[linux-2.6.25/__bio_for_each_segment()]]
to = bio_iovec_idx(bio, i);
if (!to->bv_page) {
to->bv_page = from->bv_page;
to->bv_len = from->bv_len;
to->bv_offset = from->bv_offset;
}
-
--[[linux-2.6.25/bio_iovec_idx()]]
}
bio->bi_bdev = (*bio_orig)->bi_bdev;
bio->bi_flags |= (1 << BIO_BOUNCED);
bio->bi_sector = (*bio_orig)->bi_sector;
bio->bi_rw = (*bio_orig)->bi_rw;
bio->bi_vcnt = (*bio_orig)->bi_vcnt;
bio->bi_idx = (*bio_orig)->bi_idx;
bio->bi_size = (*bio_orig)->bi_size;
if (pool == page_pool) {
bio->bi_end_io = bounce_end_io_write;
if (rw == READ)
bio->bi_end_io = bounce_end_io_r...
} else {
bio->bi_end_io = bounce_end_io_write_isa;
if (rw == READ)
bio->bi_end_io = bounce_end_io_r...
}
bio->bi_private = *bio_orig;
*bio_orig = bio;
}
*コメント [#n2353ac7]
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