[PATCH 0/2] Implement readahead for squashfs

[Hsin-Yi Wang]

Commit c1f6925e1091("mm: put readahead pages in cache earlier") requires
fs to implement readahead callback. Otherwise there will be a
performance regression.

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
discussion 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

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

 fs/squashfs/file.c  | 77 +++++++++++++++++++++++++++++++++++++++++++++
 fs/squashfs/super.c | 33 -------------------
 2 files changed, 77 insertions(+), 33 deletions(-)

-- 
2.36.0.550.gb090851708-goog