linux-kernel - [PATCH 0/4] cifs: Use fscache I/O again after the rewrite disabled it

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Message-ID: <164329930161.843658.7387773437540491743.stgit@warthog.procyon.org.uk>
Date:   Thu, 27 Jan 2022 16:01:41 +0000
From:   David Howells <dhowells@...hat.com>
To:     Steve French <smfrench@...il.com>
Cc:     Shyam Prasad N <nspmangalore@...il.com>,
        linux-cifs@...r.kernel.org, linux-cachefs@...hat.com,
        Jeff Layton <jlayton@...nel.org>,
        Matthew Wilcox <willy@...radead.org>, dhowells@...hat.com,
        Shyam Prasad N <nspmangalore@...il.com>,
        Jeff Layton <jlayton@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-cifs@...r.kernel.org, linux-cachefs@...hat.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/4] cifs: Use fscache I/O again after the rewrite disabled it


Hi Steve,

Here are some patches to make cifs actually do I/O to the cache after it
got disabled in the fscache rewrite[1] plus a warning fix that you might
want to detach and take separately:

 (1) Fix a kernel doc warning.

 (2) Change cifs from using ->readpages() to using ->readahead().

 (3) Provide a netfs cache op to query for the presence of data in the
     cache.[*]

 (4) Make ->readahead() call

The patches can be found here also:

	https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=fscache-rewrite

David

[*] Ideally, we would use the netfslib read helpers, but it's probably better
    to roll iterators down into cifs's I/O layer before doing that[2].

Link: https://lore.kernel.org/r/164021479106.640689.17404516570194656552.stgit@warthog.procyon.org.uk/ [1]
Link: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=cifs-experimental [2]

---
David Howells (4):
      Fix a warning about a malformed kernel doc comment in cifs by removing the
      cifs: Transition from ->readpages() to ->readahead()
      netfs, cachefiles: Add a method to query presence of data in the cache
      cifs: Implement cache I/O by accessing the cache directly


 Documentation/filesystems/netfs_library.rst |  16 ++
 fs/cachefiles/io.c                          |  59 ++++++
 fs/cifs/connect.c                           |   2 +-
 fs/cifs/file.c                              | 221 ++++++++------------
 fs/cifs/fscache.c                           | 126 +++++++++--
 fs/cifs/fscache.h                           |  79 ++++---
 include/linux/netfs.h                       |   7 +
 7 files changed, 322 insertions(+), 188 deletions(-)