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From: David Howells <dhowells@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: dhowells@redhat.com, linux-cachefs@redhat.com,
	linux-afs@lists.infradead.org,
	Marc Dionne <marc.dionne@auristor.com>,
	Eric Van Hensbergen <ericvh@gmail.com>,
	"Matthew Wilcox (Oracle)" <willy@infradead.org>,
	Dave Wysochanski <dwysocha@redhat.com>,
	CIFS <linux-cifs@vger.kernel.org>,
	Dominique Martinet <asmadeus@codewreck.org>,
	Steve French <sfrench@samba.org>,
	Shyam Prasad N <nspmangalore@gmail.com>,
	Jeff Layton <jlayton@kernel.org>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	linux-nfs@vger.kernel.org, Latchesar Ionkov <lucho@ionkov.net>,
	v9fs-developer@lists.sourceforge.net,
	Trond Myklebust <trond.myklebust@hammerspace.com>,
	Trond Myklebust <trondmy@hammerspace.com>,
	Jeff Layton <jlayton@kernel.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Omar Sandoval <osandov@osandov.com>,
	ceph-devel@vger.kernel.org,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 00/53] fscache: Rewrite index API and management system
Date: Fri, 22 Oct 2021 20:40:16 +0100	[thread overview]
Message-ID: <1041557.1634931616@warthog.procyon.org.uk> (raw)
In-Reply-To: <CAHk-=wjmx7+PD0hzWj5Bg2b807xYD2KCZApTvFje=ufo+MxBMQ@mail.gmail.com>

Linus Torvalds <torvalds@linux-foundation.org> wrote:

> Honestly, I don't see the point of this when it ends up just being
> dead code basically immediately.
> 
> You don't actually support picking one or the other at build time,
> just a hard switch-over.
> 
> That makes the old fscache driver useless. You can't say "use the old
> one because I don't trust the new". You just have a legacy
> implementation with no users.

What's the best way to do this?  Is it fine to disable caching in all the
network filesystems and then directly remove the fscache and cachefiles
drivers and replace them?  It won't stop the network filesystems actually
working - it'll just mean that they don't do any caching until converted and
have caching reenabled.

David


  parent reply	other threads:[~2021-10-22 19:40 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-22 18:58 [PATCH v2 00/53] fscache: Rewrite index API and management system David Howells
2021-10-22 18:58 ` [PATCH v2 01/53] fscache_old: Move the old fscache driver to one side David Howells
2021-10-22 18:59 ` [PATCH v2 02/53] fscache_old: Rename CONFIG_FSCACHE* to CONFIG_FSCACHE_OLD* David Howells
2021-10-22 18:59 ` [PATCH v2 03/53] cachefiles_old: Move the old cachefiles driver to one side David Howells
2021-10-22 18:59 ` [PATCH v2 04/53] cachefiles_old: Rename CONFIG_CACHEFILES* to CONFIG_CACHEFILES_OLD* David Howells
2021-10-22 18:59 ` [PATCH v2 05/53] netfs: Display the netfs inode number in the netfs_read tracepoint David Howells
2021-10-22 19:00 ` [PATCH v2 06/53] netfs: Pass a flag to ->prepare_write() to say if there's no alloc'd space David Howells
2021-10-22 19:00 ` [PATCH v2 07/53] fscache: Introduce new driver David Howells
2021-10-22 19:01 ` [PATCH v2 08/53] fscache: Implement a hash function David Howells
2021-10-22 19:01 ` [PATCH v2 09/53] fscache: Implement cache registration David Howells
2021-10-22 19:01 ` [PATCH v2 10/53] fscache: Implement volume registration David Howells
2021-10-22 19:01 ` [PATCH v2 11/53] fscache: Implement cookie registration David Howells
2021-10-22 19:02 ` [PATCH v2 12/53] fscache: Implement cache-level access helpers David Howells
2021-10-22 19:02 ` [PATCH v2 13/53] fscache: Implement volume-level " David Howells
2021-10-22 19:02 ` [PATCH v2 14/53] fscache: Implement cookie-level " David Howells
2021-10-22 19:02 ` [PATCH v2 15/53] fscache: Implement functions add/remove a cache David Howells
2021-10-22 19:02 ` [PATCH v2 16/53] fscache: Provide and use cache methods to lookup/create/free a volume David Howells
2021-10-22 19:03 ` [PATCH v2 17/53] fscache: Add a function for a cache backend to note an I/O error David Howells
2021-10-22 19:03 ` [PATCH v2 18/53] fscache: Implement simple cookie state machine David Howells
2021-10-22 19:03 ` [PATCH v2 19/53] fscache: Implement cookie user counting and resource pinning David Howells
2021-10-22 19:03 ` [PATCH v2 20/53] fscache: Implement cookie invalidation David Howells
2021-10-22 19:03 ` [PATCH v2 21/53] fscache: Provide a means to begin an operation David Howells
2021-10-22 19:04 ` [PATCH v2 22/53] fscache: Provide read/write stat counters for the cache David Howells
2021-10-22 19:04 ` [PATCH v2 23/53] fscache: Provide a function to let the netfs update its coherency data David Howells
2021-10-22 19:04 ` [PATCH v2 24/53] fscache: Implement I/O interface David Howells
2021-10-22 19:04 ` [PATCH v2 25/53] fscache: Provide fallback I/O functions David Howells
2021-10-22 19:05 ` [PATCH v2 26/53] vfs, fscache: Implement pinning of cache usage for writeback David Howells
2021-10-22 19:05 ` [PATCH v2 27/53] fscache: Provide a function to note the release of a page David Howells
2021-10-22 19:05 ` [PATCH v2 28/53] fscache: Provide a function to resize a cookie David Howells
2021-10-22 19:05 ` [PATCH v2 29/53] cachefiles: Introduce new driver David Howells
2021-10-22 19:06 ` [PATCH v2 30/53] cachefiles: Add some error injection support David Howells
2021-10-22 19:06 ` [PATCH v2 31/53] cachefiles: Define structs David Howells
2021-10-22 19:06 ` [PATCH v2 32/53] cachefiles: Add a couple of tracepoints for logging errors David Howells
2021-10-22 19:06 ` [PATCH v2 33/53] cachefiles: Add I/O error reporting macros David Howells
2021-10-22 19:06 ` [PATCH v2 34/53] cachefiles: Provide a function to check how much space there is David Howells
2021-10-22 19:07 ` [PATCH v2 35/53] cachefiles: Implement a function to get/create a directory in the cache David Howells
2021-10-22 19:07 ` [PATCH v2 36/53] cachefiles: Implement daemon UAPI and cache registration David Howells
2021-10-22 19:07 ` [PATCH v2 37/53] cachefiles: Implement volume support David Howells
2021-10-22 19:07 ` [PATCH v2 38/53] cachefiles: Implement data storage object handling David Howells
2021-10-22 19:07 ` [PATCH v2 39/53] cachefiles: Implement begin and end I/O David Howells
2021-10-22 19:08 ` [PATCH v2 40/53] cachefiles: Implement the I/O routines David Howells
2021-10-22 19:08 ` [PATCH v2 41/53] afs: Handle len being extending over page end in write_begin/write_end David Howells
2021-10-22 19:08 ` [PATCH v2 42/53] afs: Fix afs_write_end() to handle len > page size David Howells
2021-10-22 19:08 ` [PATCH v2 43/53] afs: Make afs_write_begin() return the THP subpage David Howells
2021-10-22 19:08 ` [PATCH v2 44/53] afs: Convert afs to use the new fscache API David Howells
2021-10-22 19:09 ` [PATCH v2 45/53] afs: Copy local writes to the cache when writing to the server David Howells
2021-10-22 19:09 ` [PATCH v2 46/53] afs: Skip truncation on the server of data we haven't written yet David Howells
2021-10-22 19:09 ` [PATCH v2 47/53] afs: Add synchronous O_DIRECT support David Howells
2021-10-22 19:09 ` [PATCH v2 48/53] 9p: Use fscache indexing rewrite and reenable caching David Howells
2021-10-22 19:10 ` [PATCH v2 49/53] 9p: Copy local writes to the cache when writing to the server David Howells
2021-10-22 19:10 ` [PATCH v2 50/53] nfs: Convert to new fscache volume/cookie API David Howells
2021-10-22 19:10 ` [PATCH v2 51/53] cifs: Support fscache indexing rewrite (untested) David Howells
2021-10-22 19:10 ` [PATCH v2 52/53] fscache, cachefiles: Display stats of no-space events David Howells
2021-10-22 19:11 ` [PATCH v2 53/53] fscache, cachefiles: Display stat of culling events David Howells
2021-10-22 19:21 ` [PATCH v2 00/53] fscache: Rewrite index API and management system Linus Torvalds
2021-10-22 19:40 ` David Howells [this message]
2021-10-22 19:58   ` Linus Torvalds
2021-10-22 20:24     ` Linus Torvalds

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