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-rw-r--r--fs/block_dev.c55
1 files changed, 24 insertions, 31 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 7b9cd49..826b164 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1201,7 +1201,11 @@ 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);
@@ -1693,13 +1697,24 @@ 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,
@@ -1730,43 +1745,25 @@ 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,
};
@@ -1774,18 +1771,14 @@ 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;
}
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