Merge tag 'pm+acpi-4.5-final' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...

[deliverable/linux.git] / fs / dax.c

diff --git a/fs/dax.c b/fs/dax.c
index 9a173dd8c4a3c710e7a40e5f92bc0023e428f1e5..bbb2ad78377020ac85158fb61df067aceadaafe5 100644 (file)
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -484,11 +484,10 @@ static int dax_writeback_one(struct block_device *bdev,
  * end]. This is required by data integrity operations to ensure file data is
  * on persistent storage prior to completion of the operation.
  */
-int dax_writeback_mapping_range(struct address_space *mapping, loff_t start,
-               loff_t end)
+int dax_writeback_mapping_range(struct address_space *mapping,
+               struct block_device *bdev, struct writeback_control *wbc)
 {
        struct inode *inode = mapping->host;
-       struct block_device *bdev = inode->i_sb->s_bdev;
        pgoff_t start_index, end_index, pmd_index;
        pgoff_t indices[PAGEVEC_SIZE];
        struct pagevec pvec;
@@ -499,8 +498,11 @@ int dax_writeback_mapping_range(struct address_space *mapping, loff_t start,
        if (WARN_ON_ONCE(inode->i_blkbits != PAGE_SHIFT))
                return -EIO;
 
-       start_index = start >> PAGE_CACHE_SHIFT;
-       end_index = end >> PAGE_CACHE_SHIFT;
+       if (!mapping->nrexceptional || wbc->sync_mode != WB_SYNC_ALL)
+               return 0;
+
+       start_index = wbc->range_start >> PAGE_CACHE_SHIFT;
+       end_index = wbc->range_end >> PAGE_CACHE_SHIFT;
        pmd_index = DAX_PMD_INDEX(start_index);
 
        rcu_read_lock();
@@ -1054,6 +1056,7 @@ EXPORT_SYMBOL_GPL(dax_pmd_fault);
 int dax_pfn_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
        struct file *file = vma->vm_file;
+       int error;
 
        /*
         * We pass NO_SECTOR to dax_radix_entry() because we expect that a
@@ -1063,7 +1066,13 @@ int dax_pfn_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
         * saves us from having to make a call to get_block() here to look
         * up the sector.
         */
-       dax_radix_entry(file->f_mapping, vmf->pgoff, NO_SECTOR, false, true);
+       error = dax_radix_entry(file->f_mapping, vmf->pgoff, NO_SECTOR, false,
+                       true);
+
+       if (error == -ENOMEM)
+               return VM_FAULT_OOM;
+       if (error)
+               return VM_FAULT_SIGBUS;
        return VM_FAULT_NOPAGE;
 }
 EXPORT_SYMBOL_GPL(dax_pfn_mkwrite);