Revert "block: use DAX for partition table reads"

commit d1a5f2b4d8a1 ("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
223757016837 ("block_dev: remove DAX leftovers").

Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

3 files changed, 2 insertions, 41 deletions

diff --git a/block/partition-generic.c b/block/partition-generic.c
index 7afb9907821f..5dfac337b0f2 100644
--- a/block/partition-generic.c
+++ b/block/partition-generic.c
@@ -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;
diff --git a/fs/dax.c b/fs/dax.c
index de622d4282a6..b78a6947c4f5 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -101,26 +101,6 @@ static int dax_is_empty_entry(void *entry)
         return (unsigned long)entry & RADIX_DAX_EMPTY;
 }
 
-struct page *read_dax_sector(struct block_device *bdev, sector_t n)
-{
-        struct page *page = alloc_pages(GFP_KERNEL, 0);
-        struct blk_dax_ctl dax = {
-                .size = PAGE_SIZE,
-                .sector = n & ~((((int) PAGE_SIZE) / 512) - 1),
-        };
-        long rc;
-
-        if (!page)
-                return ERR_PTR(-ENOMEM);
-
-        rc = dax_map_atomic(bdev, &dax);
-        if (rc < 0)
-                return ERR_PTR(rc);
-        memcpy_from_pmem(page_address(page), dax.addr, PAGE_SIZE);
-        dax_unmap_atomic(bdev, &dax);
-        return page;
-}
-
 /*
  * DAX radix tree locking
  */
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 7e62e280c11f..0d0d890f9186 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -70,15 +70,9 @@ void dax_wake_mapping_entry_waiter(struct address_space *mapping,
                 pgoff_t index, void *entry, bool wake_all);
 
 #ifdef CONFIG_FS_DAX
-struct page *read_dax_sector(struct block_device *bdev, sector_t n);
 int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
                 unsigned int offset, unsigned int length);
 #else
-static inline struct page *read_dax_sector(struct block_device *bdev,
-                sector_t n)
-{
-        return ERR_PTR(-ENXIO);
-}
 static inline int __dax_zero_page_range(struct block_device *bdev,
                 sector_t sector, unsigned int offset, unsigned int length)
 {