[PATCH v7 0/4] Implement readahead for squashfs

[Hsin-Yi Wang]

Commit 9eec1d897139("squashfs: provide backing_dev_info in order to
disable read-ahead") mitigates the performance drop issue for squashfs
by closing readahead for it.

This series implements readahead callback for squashfs. The previous
discussions are in [1] and [2].

[1]
https://lore.kernel.org/all/CAJMQK-g9G6KQmH-V=BRGX0swZji9Wxe_2c7ht-MMAapdFy2pXw@xxxxxxxxxxxxxx/T/
[2]
https://lore.kernel.org/linux-mm/Yn5Yij9pRPCzDozt@xxxxxxxxxxxxxxxxxxxx/t/#m4af4473b94f98a4996cb11756b633a07e5e059d1

v7 adds the patch to support reading fragments in readahead call[3]. No
changes on other patches since v6, which is included in next-20220617.

[3]
https://patchwork.kernel.org/project/linux-mm/patch/20220617030345.24712-1-phillip@xxxxxxxxxxxxxxx/

Hsin-Yi Wang (2):
  Revert "squashfs: provide backing_dev_info in order to disable
    read-ahead"
  squashfs: implement readahead

Phillip Lougher (2):
  squashfs: always build "file direct" version of page actor
  squashfs: support reading fragments in readahead call

 fs/squashfs/Makefile     |   4 +-
 fs/squashfs/file.c       | 133 ++++++++++++++++++++++++++++++++++++++-
 fs/squashfs/page_actor.h |  46 --------------
 fs/squashfs/super.c      |  33 ----------
 4 files changed, 134 insertions(+), 82 deletions(-)

-- 
2.36.1.476.g0c4daa206d-goog