From: Amir Goldstein <amir73il@gmail.com>
To: Ioannis Angelakopoulos <iangelak@redhat.com>
Cc: linux-fsdevel <linux-fsdevel@vger.kernel.org>,
virtio-fs-list <virtio-fs@redhat.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Jan Kara <jack@suse.cz>, Al Viro <viro@zeniv.linux.org.uk>,
Miklos Szeredi <miklos@szeredi.hu>,
Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [RFC PATCH 1/7] FUSE: Add the fsnotify opcode and in/out structs to FUSE
Date: Tue, 26 Oct 2021 21:28:04 +0300 [thread overview]
Message-ID: <CAOQ4uxj+32zyWNsSVyVO25xCGp+2BjEZtG1S9xmCzjVii4Skiw@mail.gmail.com> (raw)
In-Reply-To: <CAOQ4uxinGYb0QtgE8To5wc2iijT9VpTgDiXEp-9YXz=t_6eMbA@mail.gmail.com>
On Tue, Oct 26, 2021 at 5:56 PM Amir Goldstein <amir73il@gmail.com> wrote:
>
> On Mon, Oct 25, 2021 at 11:47 PM Ioannis Angelakopoulos
> <iangelak@redhat.com> wrote:
> >
> > Since fsnotify is the backend for the inotify subsystem all the backend
> > code implementation we add is related to fsnotify.
> >
> > To support an fsnotify request in FUSE and specifically virtiofs we add a
> > new opcode for the FSNOTIFY (51) operation request in the "fuse.h" header.
> >
> > Also add the "fuse_notify_fsnotify_in" and "fuse_notify_fsnotify_out"
> > structs that are responsible for passing the fsnotify/inotify related data
> > to and from the FUSE server.
> >
> > Signed-off-by: Ioannis Angelakopoulos <iangelak@redhat.com>
> > ---
> > include/uapi/linux/fuse.h | 23 ++++++++++++++++++++++-
> > 1 file changed, 22 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
> > index 46838551ea84..418b7fc72417 100644
> > --- a/include/uapi/linux/fuse.h
> > +++ b/include/uapi/linux/fuse.h
> > @@ -186,6 +186,9 @@
> > * - add FUSE_SYNCFS
> > * 7.35
> > * - add FUSE_NOTIFY_LOCK
> > + * 7.36
> > + * - add FUSE_HAVE_FSNOTIFY
> > + * - add fuse_notify_fsnotify_(in,out)
> > */
> >
> > #ifndef _LINUX_FUSE_H
> > @@ -221,7 +224,7 @@
> > #define FUSE_KERNEL_VERSION 7
> >
> > /** Minor version number of this interface */
> > -#define FUSE_KERNEL_MINOR_VERSION 35
> > +#define FUSE_KERNEL_MINOR_VERSION 36
> >
> > /** The node ID of the root inode */
> > #define FUSE_ROOT_ID 1
> > @@ -338,6 +341,7 @@ struct fuse_file_lock {
> > * write/truncate sgid is killed only if file has group
> > * execute permission. (Same as Linux VFS behavior).
> > * FUSE_SETXATTR_EXT: Server supports extended struct fuse_setxattr_in
> > + * FUSE_HAVE_FSNOTIFY: remote fsnotify/inotify event subsystem support
> > */
> > #define FUSE_ASYNC_READ (1 << 0)
> > #define FUSE_POSIX_LOCKS (1 << 1)
> > @@ -369,6 +373,7 @@ struct fuse_file_lock {
> > #define FUSE_SUBMOUNTS (1 << 27)
> > #define FUSE_HANDLE_KILLPRIV_V2 (1 << 28)
> > #define FUSE_SETXATTR_EXT (1 << 29)
> > +#define FUSE_HAVE_FSNOTIFY (1 << 30)
> >
> > /**
> > * CUSE INIT request/reply flags
> > @@ -515,6 +520,7 @@ enum fuse_opcode {
> > FUSE_SETUPMAPPING = 48,
> > FUSE_REMOVEMAPPING = 49,
> > FUSE_SYNCFS = 50,
> > + FUSE_FSNOTIFY = 51,
> >
> > /* CUSE specific operations */
> > CUSE_INIT = 4096,
> > @@ -532,6 +538,7 @@ enum fuse_notify_code {
> > FUSE_NOTIFY_RETRIEVE = 5,
> > FUSE_NOTIFY_DELETE = 6,
> > FUSE_NOTIFY_LOCK = 7,
> > + FUSE_NOTIFY_FSNOTIFY = 8,
> > FUSE_NOTIFY_CODE_MAX,
> > };
> >
> > @@ -571,6 +578,20 @@ struct fuse_getattr_in {
> > uint64_t fh;
> > };
> >
> > +struct fuse_notify_fsnotify_out {
> > + uint64_t inode;
>
> 64bit inode is not a good unique identifier of the object.
> you need to either include the generation in object identifier
> or much better use the object's nfs file handle, the same way
> that fanotify stores object identifiers.
>
> > + uint64_t mask;
> > + uint32_t namelen;
> > + uint32_t cookie;
>
> I object to persisting with the two-events-joined-by-cookie design.
> Any new design should include a single event for rename
> with information about src and dst.
>
> I know this is inconvenient, but we are NOT going to create a "remote inotify"
> interface, we need to create a "remote fsnotify" interface and if server wants
> to use inotify, it will need to join the disjoined MOVE_FROM/TO event into
> a single "remote event", that FUSE will use to call fsnotify_move().
>
TBH, the disjoint vs. joint from/to event is an unfinished business
for fanotify.
So my objection above is more of a strong wish.
But I admit that if existing network protocols already encode the disjoint
from/to events semantics, I may need to fold back on that objection.
Thanks,
Amir.
next prev parent reply other threads:[~2021-10-26 18:28 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-25 20:46 [RFC PATCH 0/7] Inotify support in FUSE and virtiofs Ioannis Angelakopoulos
2021-10-25 20:46 ` [RFC PATCH 1/7] FUSE: Add the fsnotify opcode and in/out structs to FUSE Ioannis Angelakopoulos
2021-10-26 14:56 ` Amir Goldstein
2021-10-26 18:28 ` Amir Goldstein [this message]
[not found] ` <CAO17o20+jiij64y7b3eKoCjG5b_mLZj6o1LSnZ7+8exN3dFYEg@mail.gmail.com>
2021-10-27 5:46 ` Amir Goldstein
2021-10-27 21:46 ` Vivek Goyal
2021-10-28 4:13 ` Amir Goldstein
2021-10-28 14:20 ` Vivek Goyal
2021-10-25 20:46 ` [RFC PATCH 2/7] FUSE: Add the remote inotify support capability " Ioannis Angelakopoulos
2021-10-25 20:46 ` [RFC PATCH 3/7] FUSE,Inotify,Fsnotify,VFS: Add the fuse_fsnotify_update_mark inode operation Ioannis Angelakopoulos
2021-10-26 15:06 ` Amir Goldstein
2021-11-01 17:49 ` Vivek Goyal
2021-11-02 7:34 ` Amir Goldstein
2021-10-25 20:46 ` [RFC PATCH 4/7] FUSE: Add the fuse_fsnotify_send_request to FUSE Ioannis Angelakopoulos
2021-10-25 20:46 ` [RFC PATCH 5/7] Fsnotify: Add a wrapper around the fsnotify function Ioannis Angelakopoulos
2021-10-26 14:37 ` Amir Goldstein
2021-10-26 15:38 ` Vivek Goyal
2021-10-25 20:46 ` [RFC PATCH 6/7] FUSE,Fsnotify: Add the fuse_fsnotify_event inode operation Ioannis Angelakopoulos
2021-10-25 20:46 ` [RFC PATCH 7/7] virtiofs: Add support for handling the remote fsnotify notifications Ioannis Angelakopoulos
2021-10-26 15:23 ` [RFC PATCH 0/7] Inotify support in FUSE and virtiofs Amir Goldstein
2021-10-26 15:52 ` Vivek Goyal
2021-10-26 18:19 ` Amir Goldstein
2021-10-26 16:18 ` Vivek Goyal
2021-10-26 17:59 ` Amir Goldstein
2021-10-26 18:27 ` Vivek Goyal
2021-10-26 19:04 ` Amir Goldstein
[not found] ` <CAO17o20sdKAWQN6w7Oe0Ze06qcK+J=6rrmA_aWGnY__MRVDCKw@mail.gmail.com>
2021-10-27 5:59 ` Amir Goldstein
2021-10-27 13:23 ` Jan Kara
2021-10-27 20:29 ` Vivek Goyal
2021-10-27 20:37 ` Vivek Goyal
2021-11-02 11:09 ` Jan Kara
2021-11-02 12:54 ` Amir Goldstein
2021-11-02 20:34 ` Vivek Goyal
2021-11-03 7:31 ` Amir Goldstein
2021-11-03 22:29 ` Vivek Goyal
2021-11-04 5:19 ` Amir Goldstein
2021-11-03 10:09 ` Jan Kara
2021-11-03 11:17 ` Amir Goldstein
2021-11-03 22:36 ` Vivek Goyal
2021-11-04 5:29 ` Amir Goldstein
2021-11-04 10:03 ` Jan Kara
2021-11-05 14:30 ` Vivek Goyal
2021-11-10 6:28 ` Amir Goldstein
2021-11-11 17:30 ` Jan Kara
2021-11-11 20:52 ` Amir Goldstein
2021-11-16 5:09 ` Stef Bon
[not found] ` <CAO17o21YVczE2-BTAVg-0HJU6gjSUkzUSqJVs9k-_t7mYFNHaA@mail.gmail.com>
2021-11-17 6:40 ` Amir Goldstein
2021-11-30 15:27 ` Vivek Goyal
[not found] ` <CAO17o21uh3fJHd0gMu-SmZei5et6HJo91DiLk_YyfUqrtHy2pQ@mail.gmail.com>
2021-12-15 7:10 ` Amir Goldstein
2021-12-15 16:44 ` Vivek Goyal
2021-12-15 17:29 ` Amir Goldstein
2021-12-15 19:20 ` Vivek Goyal
2021-12-15 19:54 ` Amir Goldstein
2021-12-16 11:03 ` Amir Goldstein
2021-12-16 16:24 ` Vivek Goyal
2021-12-16 18:22 ` Amir Goldstein
2021-12-16 22:24 ` Vivek Goyal
2021-12-17 4:21 ` Amir Goldstein
2021-12-17 14:15 ` Vivek Goyal
2021-12-18 8:28 ` Amir Goldstein
2021-12-20 16:41 ` Vivek Goyal
2021-12-20 18:22 ` Amir Goldstein
2022-01-06 23:37 ` Steve French
2021-11-30 15:36 ` Vivek Goyal
2021-10-27 20:24 ` Vivek Goyal
2021-10-28 5:11 ` Amir Goldstein
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