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block, THP: make block_device_operations.rw_page support THP

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The .rw_page in struct block_device_operations is used by the swap
subsystem to read/write the page contents from/into the corresponding
swap slot in the swap device.  To support the THP (Transparent Huge
Page) swap optimization, the .rw_page is enhanced to support to
read/write THP if possible.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: "Huang, Ying" <[email protected]>
Reviewed-by: Ross Zwisler <[email protected]> [for brd.c, zram_drv.c, pmem.c]
Cc: Johannes Weiner <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Vishal L Verma <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: "Kirill A . Shutemov" <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Shaohua Li <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Huang Ying 2017-09-06 16:22:27 -07:00 • committed by Linus Torvalds
commit 98cc093cba
4 changed files with 40 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

4
drivers/nvdimm/btt.c
View file

@ -1241,8 +1241,10 @@ static int btt_rw_page(struct block_device *bdev, sector_t sector,
{
struct btt *btt = bdev->bd_disk->private_data;
int rc;
unsigned int len;
rc = btt_do_bvec(btt, NULL, page, PAGE_SIZE, 0, is_write, sector);
len = hpage_nr_pages(page) * PAGE_SIZE;
rc = btt_do_bvec(btt, NULL, page, len, 0, is_write, sector);
if (rc == 0)
page_endio(page, is_write, 0);

37
drivers/nvdimm/pmem.c
View file

@ -80,22 +80,40 @@ static blk_status_t pmem_clear_poison(struct pmem_device *pmem,
static void write_pmem(void *pmem_addr, struct page *page,
unsigned int off, unsigned int len)
{
void *mem = kmap_atomic(page);
unsigned int chunk;
void *mem;
memcpy_flushcache(pmem_addr, mem + off, len);
kunmap_atomic(mem);
while (len) {
mem = kmap_atomic(page);
chunk = min_t(unsigned int, len, PAGE_SIZE);
memcpy_flushcache(pmem_addr, mem + off, chunk);
kunmap_atomic(mem);
len -= chunk;
off = 0;
page++;
pmem_addr += PAGE_SIZE;
}
}
static blk_status_t read_pmem(struct page *page, unsigned int off,
void *pmem_addr, unsigned int len)
{
unsigned int chunk;
int rc;
void *mem = kmap_atomic(page);
void *mem;
rc = memcpy_mcsafe(mem + off, pmem_addr, len);
kunmap_atomic(mem);
if (rc)
return BLK_STS_IOERR;
while (len) {
mem = kmap_atomic(page);
chunk = min_t(unsigned int, len, PAGE_SIZE);
rc = memcpy_mcsafe(mem + off, pmem_addr, chunk);
kunmap_atomic(mem);
if (rc)
return BLK_STS_IOERR;
len -= chunk;
off = 0;
page++;
pmem_addr += PAGE_SIZE;
}
return BLK_STS_OK;
}
@ -188,7 +206,8 @@ static int pmem_rw_page(struct block_device *bdev, sector_t sector,
struct pmem_device *pmem = bdev->bd_queue->queuedata;
blk_status_t rc;
rc = pmem_do_bvec(pmem, page, PAGE_SIZE, 0, is_write, sector);
rc = pmem_do_bvec(pmem, page, hpage_nr_pages(page) * PAGE_SIZE,
0, is_write, sector);
/*
* The ->rw_page interface is subtle and tricky. The core