From fa5d932c323e8e0d9b24b3517997d15b36d1607d Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 27 Jan 2017 12:04:59 -0800 Subject: 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 --- fs/ext4/inode.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'fs/ext4') diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 4247d8d25687..2cb2634daa99 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; -- cgit v1.2.3