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ext2, ext4, xfs: retrieve dax_device for iomap operations

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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>
This commit is contained in:
Dan Williams
2017-01-27 12:04:59 -08:00
parent 817bf40265
commit fa5d932c32
4 changed files with 27 additions and 2 deletions
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9
fs/ext2/inode.c
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@@ -799,6 +799,7 @@ int ext2_get_block(struct inode *inode, sector_t iblock,
static int ext2_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 max_blocks = (length + (1 << blkbits) - 1) >> blkbits;
@@ -812,8 +813,13 @@ static int ext2_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
return ret;
iomap->flags = 0;
iomap->bdev = inode->i_sb->s_bdev;
bdev = inode->i_sb->s_bdev;
iomap->bdev = bdev;
iomap->offset = (u64)first_block << blkbits;
if (blk_queue_dax(bdev->bd_queue))
iomap->dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
else
iomap->dax_dev = NULL;
if (ret == 0) {
iomap->type = IOMAP_HOLE;
@@ -835,6 +841,7 @@ static int
ext2_iomap_end(struct inode *inode, loff_t offset, loff_t length,
ssize_t written, unsigned flags, struct iomap *iomap)
{
put_dax(iomap->dax_dev);
if (iomap->type == IOMAP_MAPPED &&
written < length &&
(flags & IOMAP_WRITE))