On Tue, Feb 20, 2024 at 07:57:12PM +0800, Yu Kuai wrote: > Hi, Christian > > 在 2024/01/29 18:56, Christian Brauner 写道: > > The only user that doesn't rely on files is the block layer itself in > > block/fops.c where we only have access to the block device. As the bdev > > filesystem doesn't open block devices as files obviously. > > > > This introduces a union into struct buffer_head and struct iomap. The > > union encompasses both struct block_device and struct file. In both > > cases a flag is used to differentiate whether a block device or a proper > > file was stashed. Simple accessors bh_bdev() and iomap_bdev() are used > > to return the block device in the really low-level functions where it's > > needed. These are overall just a few callsites. > > I just realize that your implementation for iomap and buffer_head is > better, if you don't mind. I'll split related changes into a seperate > patch, and send out together. Sure!
