[v3,00/18] Refactor generic_file_buffered_read

Message

Matthew Wilcox Nov. 10, 2020, 3:36 a.m. UTC

This is a combination of Christoph's work to refactor
generic_file_buffered_read() and my THP support on top of Kent's patches
which are currently in -mm.  I really like where this ended up.

v3:
 - Fixed missing put_page for readahead with IOCB_NOIO (hch)
 - Fixed commit message for lock_page_for_iocb (nborisov)
 - Kent has agreed to reduce to PAGEVEC_SIZE entries per iteration,
   since we can go up to larger pagevecs later if needed.
v2:
 - Added pagevec conversion upfront and rebased other patches on top of
   it (me)
 - Limit page search by max pgoff_t rather than by number of pages (me)
 - Renamed mapping_get_read_thps() to filemap_get_read_batch() (hch/me)
 - Added doc for filemap_get_read_batch() (hch/me)
 - Removed 'first' parameter from filemap_update_page() (me)
 - Folded "Remove parameters from filemap_update_page()" into an earlier
   patch (hch)
 - Restructured filemap_update_page() error handling flow (hch/me)
 - Pass the pagevec to filemap_create_page() (hch)
 - Renamed 'find_page' label to 'retry' (hch)
 - Explicitly check for AOP_TRUNCATED_PAGE instead of assuming err > 0
   means retry (hch)
 - Move mark_page_accessed() and handling of i_size into main copy loop (me)

Christoph Hellwig (2):
  mm/filemap: Rename generic_file_buffered_read to filemap_read
  mm/filemap: Simplify generic_file_read_iter

Matthew Wilcox (Oracle) (16):
  mm/filemap: Rename generic_file_buffered_read subfunctions
  mm/filemap: Remove dynamically allocated array from filemap_read
  mm/filemap: Convert filemap_get_pages to take a pagevec
  mm/filemap: Use THPs in generic_file_buffered_read
  mm/filemap: Pass a sleep state to put_and_wait_on_page_locked
  mm/filemap: Support readpage splitting a page
  mm/filemap: Inline __wait_on_page_locked_async into caller
  mm/filemap: Don't call ->readpage if IOCB_WAITQ is set
  mm/filemap: Change filemap_read_page calling conventions
  mm/filemap: Change filemap_create_page calling conventions
  mm/filemap: Convert filemap_update_page to return an errno
  mm/filemap: Move the iocb checks into filemap_update_page
  mm/filemap: Add filemap_range_uptodate
  mm/filemap: Split filemap_readahead out of filemap_get_pages
  mm/filemap: Restructure filemap_get_pages
  mm/filemap: Don't relock the page after calling readpage

 fs/btrfs/file.c         |   2 +-
 include/linux/fs.h      |   4 +-
 include/linux/pagemap.h |   3 +-
 mm/filemap.c            | 568 ++++++++++++++++++----------------------
 mm/huge_memory.c        |   4 +-
 mm/migrate.c            |   4 +-
 6 files changed, 270 insertions(+), 315 deletions(-)