Assorted improvements for swap-via-filesystem.
This is a resend of these patches, rebased on current HEAD.
The only substantial changes is that swap_dirty_folio has replaced
swap_set_page_dirty.
Currently swap-via-fs (SWP_FS_OPS) doesn't work for any filesystem. It
has previously worked for NFS but that broke a few releases back.
This series changes to use a new ->swap_rw rather than ->readpage and
->direct_IO. It also makes other improvements.
There is a companion series already in linux-next which fixes various
issues with NFS. Once both series land, a final patch is needed which
changes NFS over to use ->swap_rw.
Thanks,
NeilBrown
---
NeilBrown (10):
MM: create new mm/swap.h header file.
MM: drop swap_dirty_folio
MM: move responsibility for setting SWP_FS_OPS to ->swap_activate
MM: reclaim mustn't enter FS for SWP_FS_OPS swap-space
MM: introduce ->swap_rw and use it for reads from SWP_FS_OPS swap-space
MM: perform async writes to SWP_FS_OPS swap-space using ->swap_rw
DOC: update documentation for swap_activate and swap_rw
MM: submit multipage reads for SWP_FS_OPS swap-space
MM: submit multipage write for SWP_FS_OPS swap-space
VFS: Add FMODE_CAN_ODIRECT file flag
Documentation/filesystems/locking.rst | 18 +-
Documentation/filesystems/vfs.rst | 17 +-
drivers/block/loop.c | 4 +-
fs/cifs/file.c | 7 +-
fs/fcntl.c | 9 +-
fs/nfs/file.c | 20 ++-
fs/open.c | 9 +-
fs/overlayfs/file.c | 13 +-
include/linux/fs.h | 4 +
include/linux/swap.h | 7 +-
include/linux/writeback.h | 7 +
mm/madvise.c | 8 +-
mm/memory.c | 2 +-
mm/page_io.c | 247 +++++++++++++++++++-------
mm/swap.h | 30 +++-
mm/swap_state.c | 22 ++-
mm/swapfile.c | 13 +-
mm/vmscan.c | 38 ++--
18 files changed, 347 insertions(+), 128 deletions(-)
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