Revert "block: enable dax for raw block devices"

This reverts commit 5a023cdba50c5f5f2bc351783b3131699deb3937.

The functionality is superseded by the new "Device DAX" facility.

Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Jan Kara <jack@suse.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

4 files changed, 29 insertions, 108 deletions

diff --git a/block/ioctl.c b/block/ioctl.c
index 4ff1f92f89ca..698c7933d582 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -407,35 +407,6 @@ static inline int is_unrecognized_ioctl(int ret)
                 ret == -ENOIOCTLCMD;
 }
 
-#ifdef CONFIG_FS_DAX
-bool blkdev_dax_capable(struct block_device *bdev)
-{
-        struct gendisk *disk = bdev->bd_disk;
-
-        if (!disk->fops->direct_access)
-                return false;
-
-        /*
-         * If the partition is not aligned on a page boundary, we can't
-         * do dax I/O to it.
-         */
-        if ((bdev->bd_part->start_sect % (PAGE_SIZE / 512))
-                        || (bdev->bd_part->nr_sects % (PAGE_SIZE / 512)))
-                return false;
-
-        /*
-         * If the device has known bad blocks, force all I/O through the
-         * driver / page cache.
-         *
-         * TODO: support finer grained dax error handling
-         */
-        if (disk->bb && disk->bb->count)
-                return false;
-
-        return true;
-}
-#endif
-
 static int blkdev_flushbuf(struct block_device *bdev, fmode_t mode,
                 unsigned cmd, unsigned long arg)
 {
@@ -598,9 +569,6 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
         case BLKTRACESETUP:
         case BLKTRACETEARDOWN:
                 return blk_trace_ioctl(bdev, cmd, argp);
-        case BLKDAXGET:
-                return put_int(arg, !!(bdev->bd_inode->i_flags & S_DAX));
-                break;
         case IOC_PR_REGISTER:
                 return blkdev_pr_register(bdev, argp);
         case IOC_PR_RESERVE:
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 20a2c02b77c4..36ee10ca503e 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -29,6 +29,7 @@
 #include <linux/log2.h>
 #include <linux/cleancache.h>
 #include <linux/dax.h>
+#include <linux/badblocks.h>
 #include <asm/uaccess.h>
 #include "internal.h"
 
@@ -1159,6 +1160,33 @@ void bd_set_size(struct block_device *bdev, loff_t size)
 }
 EXPORT_SYMBOL(bd_set_size);
 
+static bool blkdev_dax_capable(struct block_device *bdev)
+{
+        struct gendisk *disk = bdev->bd_disk;
+
+        if (!disk->fops->direct_access || !IS_ENABLED(CONFIG_FS_DAX))
+                return false;
+
+        /*
+         * If the partition is not aligned on a page boundary, we can't
+         * do dax I/O to it.
+         */
+        if ((bdev->bd_part->start_sect % (PAGE_SIZE / 512))
+                        || (bdev->bd_part->nr_sects % (PAGE_SIZE / 512)))
+                return false;
+
+        /*
+         * If the device has known bad blocks, force all I/O through the
+         * driver / page cache.
+         *
+         * TODO: support finer grained dax error handling
+         */
+        if (disk->bb && disk->bb->count)
+                return false;
+
+        return true;
+}
+
 static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part);
 
 /*
@@ -1724,79 +1752,13 @@ static const struct address_space_operations def_blk_aops = {
         .is_dirty_writeback = buffer_check_dirty_writeback,
 };
 
-#ifdef CONFIG_FS_DAX
-/*
- * In the raw block case we do not need to contend with truncation nor
- * unwritten file extents.  Without those concerns there is no need for
- * additional locking beyond the mmap_sem context that these routines
- * are already executing under.
- *
- * Note, there is no protection if the block device is dynamically
- * resized (partition grow/shrink) during a fault. A stable block device
- * size is already not enforced in the blkdev_direct_IO path.
- *
- * For DAX, it is the responsibility of the block device driver to
- * ensure the whole-disk device size is stable while requests are in
- * flight.
- *
- * Finally, unlike the filemap_page_mkwrite() case there is no
- * filesystem superblock to sync against freezing.  We still include a
- * pfn_mkwrite callback for dax drivers to receive write fault
- * notifications.
- */
-static int blkdev_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
-{
-        return __dax_fault(vma, vmf, blkdev_get_block, NULL);
-}
-
-static int blkdev_dax_pfn_mkwrite(struct vm_area_struct *vma,
-                struct vm_fault *vmf)
-{
-        return dax_pfn_mkwrite(vma, vmf);
-}
-
-static int blkdev_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
-                pmd_t *pmd, unsigned int flags)
-{
-        return __dax_pmd_fault(vma, addr, pmd, flags, blkdev_get_block, NULL);
-}
-
-static const struct vm_operations_struct blkdev_dax_vm_ops = {
-        .fault          = blkdev_dax_fault,
-        .pmd_fault      = blkdev_dax_pmd_fault,
-        .pfn_mkwrite    = blkdev_dax_pfn_mkwrite,
-};
-
-static const struct vm_operations_struct blkdev_default_vm_ops = {
-        .fault          = filemap_fault,
-        .map_pages      = filemap_map_pages,
-};
-
-static int blkdev_mmap(struct file *file, struct vm_area_struct *vma)
-{
-        struct inode *bd_inode = bdev_file_inode(file);
-
-        file_accessed(file);
-        if (IS_DAX(bd_inode)) {
-                vma->vm_ops = &blkdev_dax_vm_ops;
-                vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
-        } else {
-                vma->vm_ops = &blkdev_default_vm_ops;
-        }
-
-        return 0;
-}
-#else
-#define blkdev_mmap generic_file_mmap
-#endif
-
 const struct file_operations def_blk_fops = {
         .open           = blkdev_open,
         .release        = blkdev_close,
         .llseek         = block_llseek,
         .read_iter      = blkdev_read_iter,
         .write_iter     = blkdev_write_iter,
-        .mmap           = blkdev_mmap,
+        .mmap           = generic_file_mmap,
         .fsync          = blkdev_fsync,
         .unlocked_ioctl = block_ioctl,
 #ifdef CONFIG_COMPAT
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 70e61b58baaf..8363a10660f6 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2320,14 +2320,6 @@ extern struct super_block *freeze_bdev(struct block_device *);
 extern void emergency_thaw_all(void);
 extern int thaw_bdev(struct block_device *bdev, struct super_block *sb);
 extern int fsync_bdev(struct block_device *);
-#ifdef CONFIG_FS_DAX
-extern bool blkdev_dax_capable(struct block_device *bdev);
-#else
-static inline bool blkdev_dax_capable(struct block_device *bdev)
-{
-        return false;
-}
-#endif
 
 extern struct super_block *blockdev_superblock;
 
diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index a079d50376e1..fbff8b28aa35 100644
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -222,7 +222,6 @@ struct fsxattr {
 #define BLKSECDISCARD _IO(0x12,125)
 #define BLKROTATIONAL _IO(0x12,126)
 #define BLKZEROOUT _IO(0x12,127)
-#define BLKDAXGET _IO(0x12,129)
 
 #define BMAP_IOCTL 1            /* obsolete - kept for compatibility */
 #define FIBMAP     _IO(0x00,1)  /* bmap access */