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authorDan Williams <dan.j.williams@intel.com>2017-01-27 12:04:59 -0800
committerDan Williams <dan.j.williams@intel.com>2017-04-25 13:20:46 -0700
commitfa5d932c323e8e0d9b24b3517997d15b36d1607d (patch)
treea340f98eaec27ee75f264871ba878007d9c6e329 /fs/ext4
parent817bf40265459578abc36c6bd53e27775b5c7ec4 (diff)
downloadop-kernel-dev-fa5d932c323e8e0d9b24b3517997d15b36d1607d.zip
op-kernel-dev-fa5d932c323e8e0d9b24b3517997d15b36d1607d.tar.gz
ext2, ext4, xfs: retrieve dax_device for iomap operations
In preparation for converting fs/dax.c to use dax_direct_access() instead of bdev_direct_access(), add the plumbing to retrieve the dax_device associated with a given block_device. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/inode.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 4247d8d..2cb2634 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3305,6 +3305,7 @@ static int ext4_releasepage(struct page *page, gfp_t wait)
static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
unsigned flags, struct iomap *iomap)
{
+ struct block_device *bdev;
unsigned int blkbits = inode->i_blkbits;
unsigned long first_block = offset >> blkbits;
unsigned long last_block = (offset + length - 1) >> blkbits;
@@ -3373,7 +3374,12 @@ retry:
}
iomap->flags = 0;
- iomap->bdev = inode->i_sb->s_bdev;
+ bdev = inode->i_sb->s_bdev;
+ iomap->bdev = bdev;
+ if (blk_queue_dax(bdev->bd_queue))
+ iomap->dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
+ else
+ iomap->dax_dev = NULL;
iomap->offset = first_block << blkbits;
if (ret == 0) {
@@ -3406,6 +3412,7 @@ static int ext4_iomap_end(struct inode *inode, loff_t offset, loff_t length,
int blkbits = inode->i_blkbits;
bool truncate = false;
+ put_dax(iomap->dax_dev);
if (!(flags & IOMAP_WRITE) || (flags & IOMAP_FAULT))
return 0;
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