[v4,00/10] iomap: incremental per-operation iter advance

Message

Brian Foster Feb. 4, 2025, 1:30 p.m. UTC

Hi all,

Here's v4 of the incremental advance series. No major changes here.. a
couple patches have been reordered in the series and patch 3 in v3 has
been split up into several smaller patches.

Thoughts, reviews, flames appreciated.

Brian

v4:
- Reordered patches 1 and 2 to keep iter advance cleanups together.
- Split patch 3 from v3 into patches 3-6.
v3: https://lore.kernel.org/linux-fsdevel/[e-mail]/
- Code style and comment fixups.
- Variable type fixups and rework of iomap_iter_advance() to return
  error/length separately.
- Advance the iter on unshare and zero range skip cases instead of
  returning length.
v2: https://lore.kernel.org/linux-fsdevel/[e-mail]/
- More refactoring of iomap_iter[_advance]() logic. Lifted out iter
  continuation and stale logic and improved comments.
- Renamed some poorly named helpers and variables.
- Return remaining length for current iter from _iter_advance() and use
  appropriately.
v1: https://lore.kernel.org/linux-fsdevel/[e-mail]/
- Reworked and fixed a bunch of functional issues.
RFC: https://lore.kernel.org/linux-fsdevel/[e-mail]/

Brian Foster (10):
  iomap: factor out iomap length helper
  iomap: split out iomap check and reset logic from iter advance
  iomap: refactor iomap_iter() length check and tracepoint
  iomap: lift error code check out of iomap_iter_advance()
  iomap: lift iter termination logic from iomap_iter_advance()
  iomap: export iomap_iter_advance() and return remaining length
  iomap: support incremental iomap_iter advances
  iomap: advance the iter directly on buffered writes
  iomap: advance the iter directly on unshare range
  iomap: advance the iter directly on zero range

 fs/iomap/buffered-io.c |  67 +++++++++++++--------------
 fs/iomap/iter.c        | 102 ++++++++++++++++++++++++++---------------
 include/linux/iomap.h  |  27 +++++++++--
 3 files changed, 119 insertions(+), 77 deletions(-)