Changes since last update:

 - Mark I/Os as failed when encountering short reads on file-backed
   mounts

 - Label GFP_NOIO in the BIO completion when the completion is in
   the process context, and directly call into the decompression
   to avoid deadlocks

 - Improve Kconfig descriptions to better highlight the overall
   efforts

 - Fix .fadvise() for page cache sharing

erofs: fix .fadvise() for page cache sharing

Currently, .fadvise() doesn't work well if page cache sharing is on
since shared inodes belong to a pseudo fs generated with init_pseudo(),
and sb->s_bdi is the default one &noop_backing_dev_info.

Then, generic_fadvise() will just behave as a no-op if sb->s_bdi is
&noop_backing_dev_info, but as the bdev fs (the bdev fs changes
inode_to_bdi() instead), it's actually NOT a pure memfs.

Let's generate a real bdi for erofs_ishare_mnt instead.

Fixes: d86d7817c042 ("erofs: implement .fadvise for page cache share")
Reviewed-by: Hongbo Li <lihongbo22@huawei.com>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>