Merge branch 'for-4.6/core' of git://git.kernel.dk/linux-block

[linux-2.6-block.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 548ded7ccbdee5b7d780f1fa30b230199515ac64..3172c4e2f50255e1cb1fb426c1723a6b7b493bb2 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1205,7 +1205,11 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
                bdev->bd_disk = disk;
                bdev->bd_queue = disk->queue;
                bdev->bd_contains = bdev;
-               bdev->bd_inode->i_flags = disk->fops->direct_access ? S_DAX : 0;
+               if (IS_ENABLED(CONFIG_BLK_DEV_DAX) && disk->fops->direct_access)
+                       bdev->bd_inode->i_flags = S_DAX;
+               else
+                       bdev->bd_inode->i_flags = 0;
+
                if (!partno) {
                        ret = -ENXIO;
                        bdev->bd_part = disk_get_part(disk, partno);
@@ -1697,13 +1701,24 @@ static int blkdev_releasepage(struct page *page, gfp_t wait)
        return try_to_free_buffers(page);
 }
 
+static int blkdev_writepages(struct address_space *mapping,
+                            struct writeback_control *wbc)
+{
+       if (dax_mapping(mapping)) {
+               struct block_device *bdev = I_BDEV(mapping->host);
+
+               return dax_writeback_mapping_range(mapping, bdev, wbc);
+       }
+       return generic_writepages(mapping, wbc);
+}
+
 static const struct address_space_operations def_blk_aops = {
        .readpage       = blkdev_readpage,
        .readpages      = blkdev_readpages,
        .writepage      = blkdev_writepage,
        .write_begin    = blkdev_write_begin,
        .write_end      = blkdev_write_end,
-       .writepages     = generic_writepages,
+       .writepages     = blkdev_writepages,
        .releasepage    = blkdev_releasepage,
        .direct_IO      = blkdev_direct_IO,
        .is_dirty_writeback = buffer_check_dirty_writeback,
@@ -1734,43 +1749,25 @@ 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_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 void blkdev_vm_open(struct vm_area_struct *vma)
+static int blkdev_dax_pfn_mkwrite(struct vm_area_struct *vma,
+               struct vm_fault *vmf)
 {
-       struct inode *bd_inode = bdev_file_inode(vma->vm_file);
-       struct block_device *bdev = I_BDEV(bd_inode);
-
-       inode_lock(bd_inode);
-       bdev->bd_map_count++;
-       inode_unlock(bd_inode);
+       return dax_pfn_mkwrite(vma, vmf);
 }
 
-static void blkdev_vm_close(struct vm_area_struct *vma)
+static int blkdev_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
+               pmd_t *pmd, unsigned int flags)
 {
-       struct inode *bd_inode = bdev_file_inode(vma->vm_file);
-       struct block_device *bdev = I_BDEV(bd_inode);
-
-       inode_lock(bd_inode);
-       bdev->bd_map_count--;
-       inode_unlock(bd_inode);
+       return __dax_pmd_fault(vma, addr, pmd, flags, blkdev_get_block, NULL);
 }
 
 static const struct vm_operations_struct blkdev_dax_vm_ops = {
-       .open           = blkdev_vm_open,
-       .close          = blkdev_vm_close,
        .fault          = blkdev_dax_fault,
        .pmd_fault      = blkdev_dax_pmd_fault,
-       .pfn_mkwrite    = blkdev_dax_fault,
+       .pfn_mkwrite    = blkdev_dax_pfn_mkwrite,
 };
 
 static const struct vm_operations_struct blkdev_default_vm_ops = {
-       .open           = blkdev_vm_open,
-       .close          = blkdev_vm_close,
        .fault          = filemap_fault,
        .map_pages      = filemap_map_pages,
 };
@@ -1778,18 +1775,14 @@ static const struct vm_operations_struct blkdev_default_vm_ops = {
 static int blkdev_mmap(struct file *file, struct vm_area_struct *vma)
 {
        struct inode *bd_inode = bdev_file_inode(file);
-       struct block_device *bdev = I_BDEV(bd_inode);
 
        file_accessed(file);
-       inode_lock(bd_inode);
-       bdev->bd_map_count++;
        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;
        }
-       inode_unlock(bd_inode);
 
        return 0;
 }