[0/5] fs/buffer: strack reduction on async read

Message

Luis Chamberlain Dec. 18, 2024, 2:26 a.m. UTC

This splits up a minor enhancement from the bs > ps device support
series into its own series for better review / focus / testing.
This series just addresses the reducing the array size used and cleaning
up the async read to be easier to read and maintain.

Changes on this series from the RFC v2:

  - Fixes the loop by ensuring we bump counts on continue as noted by
    Matthew Wilcox
  - new patch to simplify the loop by using bh_offset()
  - bike shed love on comments
  - Testing: tested on ext4 and XFS with fstests, with no regressions found
    after willy's suggested loop fix on continue. I'm however running a new
    set of tests now after a rebase onto v6.13-rc3 and a bit of patch ordering
    and the addition of bh_offset(). Prelimimary tests however show no
    issues.

[0] https://lkml.kernel.org/r/[e-mail]

Luis Chamberlain (5):
  fs/buffer: move async batch read code into a helper
  fs/buffer: simplify block_read_full_folio() with bh_offset()
  fs/buffer: add a for_each_bh() for block_read_full_folio()
  fs/buffer: add iteration support for block_read_full_folio()
  fs/buffer: reduce stack usage on bh_read_iter()

 fs/buffer.c | 221 +++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 160 insertions(+), 61 deletions(-)