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Revert "block: use DAX for partition table reads"

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commit d1a5f2b4d8 ("block: use DAX for partition table reads") was
part of a stalled effort to allow dax mappings of block devices. Since
then the device-dax mechanism has filled the role of dax-mapping static
device ranges.

Now that we are moving ->direct_access() from a block_device operation
to a dax_inode operation we would need block devices to map and carry
their own dax_inode reference.

Unless / until we decide to revive dax mapping of raw block devices
through the dax_inode scheme, there is no need to carry
read_dax_sector(). Its removal in turn allows for the removal of
bdev_direct_access() and should have been included in commit
2237570168 ("block_dev: remove DAX leftovers").

Cc: Jeff Moyer <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Dan Williams 2017-01-27 14:13:15 -08:00
commit a41fe02b6b
3 changed files with 2 additions and 41 deletions
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17
block/partition-generic.c
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@ -16,7 +16,6 @@
#include <linux/kmod.h>
#include <linux/ctype.h>
#include <linux/genhd.h>
#include <linux/dax.h>
#include <linux/blktrace_api.h>
#include "partitions/check.h"
@ -631,24 +630,12 @@ int invalidate_partitions(struct gendisk *disk, struct block_device *bdev)
return 0;
}
static struct page *read_pagecache_sector(struct block_device *bdev, sector_t n)
{
struct address_space *mapping = bdev->bd_inode->i_mapping;
return read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_SHIFT-9)),
NULL);
}
unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
{
struct address_space *mapping = bdev->bd_inode->i_mapping;
struct page *page;
/* don't populate page cache for dax capable devices */
if (IS_DAX(bdev->bd_inode))
page = read_dax_sector(bdev, n);
else
page = read_pagecache_sector(bdev, n);
page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_SHIFT-9)), NULL);
if (!IS_ERR(page)) {
if (PageError(page))
goto fail;