[PATCH v4 06/11] block: Add atomic write support for statx

[Christoph Hellwig]

> +#define BDEV_STATX_SUPPORTED_MASK (STATX_DIOALIGN | STATX_WRITE_ATOMIC)

> +	if (!(request_mask & BDEV_STATX_SUPPORTED_MASK))
> +		return;

BDEV_STATX_SUPPORTED_MASK is misleading here.  bdevs support a lot more
fields, these are just the ones needing special attention.  I'd do away
with the extra define and just open code it.

> +	/* If this is a block device inode, override the filesystem
> +	 * attributes with the block device specific parameters
> +	 * that need to be obtained from the bdev backing inode
> +	 */

This is not the normal kernel multi-line comment format.

> +	if (S_ISBLK(d_backing_inode(path.dentry)->i_mode))
> +		bdev_statx(path.dentry, stat, request_mask);

I know I touched this last, but does anyone remember why we have
various random fixups in vfs_statx and not in vfs_getattr_nosec, where
they we have more of them and also the inode at hand?