Commit fa5d932c authored by Dan Williams's avatar Dan Williams
Browse files

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: default avatarDan Williams <dan.j.williams@intel.com>
parent 817bf402

fs/ext2/inode.c

+8 −1
Original line number Diff line number Diff line
@@ -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))

fs/ext4/inode.c

+8 −1
Original line number Diff line number Diff line
@@ -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 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length, 
	}



	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;

fs/xfs/xfs_iomap.c

+10 −0
Original line number Diff line number Diff line
@@ -976,6 +976,7 @@ xfs_file_iomap_begin( 
	int			nimaps = 1, error = 0;

	bool			shared = false, trimmed = false;

	unsigned		lockmode;

	struct block_device	*bdev;



	if (XFS_FORCED_SHUTDOWN(mp))

		return -EIO;
@@ -1063,6 +1064,14 @@ xfs_file_iomap_begin( 
	}



	xfs_bmbt_to_iomap(ip, iomap, &imap);



	/* optionally associate a dax device with the iomap bdev */

	bdev = iomap->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;



	if (shared)

		iomap->flags |= IOMAP_F_SHARED;

	return 0;
@@ -1140,6 +1149,7 @@ xfs_file_iomap_end( 
	unsigned		flags,

	struct iomap		*iomap)

{

	put_dax(iomap->dax_dev);

	if ((flags & IOMAP_WRITE) && iomap->type == IOMAP_DELALLOC)

		return xfs_file_iomap_end_delalloc(XFS_I(inode), offset,

				length, written, iomap);

include/linux/iomap.h

+1 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ struct iomap { 
	u16			type;	/* type of mapping */

	u16			flags;	/* flags for mapping */

	struct block_device	*bdev;	/* block device for I/O */

	struct dax_device	*dax_dev; /* dax_dev for dax operations */

};



/*