On Mon, Dec 04, 2023 at 11:19:20AM +0800, Ming Lei wrote:
On Fri, Sep 29, 2023 at 10:27:07AM +0000, John Garry wrote:Actually it isn't true for pwritev, and sorry for the noise.
We rely the block layer always being able to send a bio of sizeBoth unit_max and unit_min are applied to FS bio, which is built over
atomic_write_unit_max without being required to split it due to request
queue or other bio limits.
A bio may contain min(BIO_MAX_VECS, limits->max_segments) vectors,
and each vector is at worst case the device logical block size from
direct IO alignment requirement.
single userspace buffer, so only the 1st and last vector can include