From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
This is still a little rough, but maybe closer. Changes since last
time:
- renamed the "opens" file to "states" and added some (minimal)
information about lock, delegation, and layout stateids as
well as opens.
- converted the states file to a YAML-like format.
- added the ability to remove a client's state by writing
"expire\n" into a new nfsd/client/#/ctl file.
Recapping discussion from last time:
The following patches expose information about NFSv4 state held by knfsd
on behalf of NFSv4 clients. This especially important for opens, which
are currently invisible to userspace on the server, unlike locks
(/proc/locks) and local processes' opens (under /proc/<pid>/).
The approach is to add a new directory /proc/fs/nfsd/clients/ with
subdirectories for each active NFSv4 client. Each subdirectory has an
"info" file with some basic information to help identify the client and
a "states" directory that lists the open state held by that client.
Currently these pseudofiles look like:
# find /proc/fs/nfsd/clients -type f|xargs tail
==> /proc/fs/nfsd/clients/3/opens <==
- 0x020000006a5fdc5c4ad09d9e01000000: { type: open, access: rw, deny: --, superblock: "fd:10:13649", owner: "open id:\x00\x00\x00&\x00\x00\x00\x00\x00\x0046��QH " }
- 0x010000006a5fdc5c4ad09d9e03000000: { type: open, access: r-, deny: --, superblock: "fd:10:13650", owner: "open id:\x00\x00\x00&\x00\x00\x00\x00\x00\x0046��QH" }
- 0x010000006a5fdc5c4ad09d9e04000000: { type: deleg, access: r, superblock: "fd:10:13650" }
- 0x010000006a5fdc5c4ad09d9e06000000: { type: lock, superblock: "fd:10:13649", owner: "lock id:\x00\x00\x00&\x00\x00\x00\x00\x00\x00\x00\x00" }
==> /proc/fs/nfsd/clients/3/info <==
clientid: 6debfb505cc0cd36
address: 192.168.122.36:907
name: "Linux NFSv4.2 test2.fieldses.org"
minor version: 2
I'm conflicted about how I'm representing stateowners and client names,
both opaque byte-streams in the protocol but that often include
human-readable ascii.
Possibly also todo:
- add some information about krb5 principals to the clients
file.
- add information about the stateids used to represent
asynchronous copies. They're a little different from the
other stateids and might end up in a separate "copies" file,
- this duplicates some functionality of the little-used fault
injection code; could we replace it entirely?
- some of the bits of filesystem code could probably be shared
with rpc_pipefs and libfs.
--b.
J. Bruce Fields (10):
nfsd: persist nfsd filesystem across mounts
nfsd: rename cl_refcount
nfsd4: use reference count to free client
nfsd: add nfsd/clients directory
nfsd: make client/ directory names small ints
rpc: replace rpc_filelist by tree_descr
nfsd4: add a client info file
nfsd4: add file to display list of client's opens
nfsd: expose some more information about NFSv4 opens
nfsd: add more information to client info file
fs/nfsd/netns.h | 6 +
fs/nfsd/nfs4state.c | 228 ++++++++++++++++++++++++++++++---
fs/nfsd/nfsctl.c | 225 +++++++++++++++++++++++++++++++-
fs/nfsd/nfsd.h | 11 ++
fs/nfsd/state.h | 9 +-
fs/seq_file.c | 17 +++
include/linux/seq_file.h | 2 +
include/linux/string_helpers.h | 1 +
lib/string_helpers.c | 5 +-
net/sunrpc/rpc_pipe.c | 37 ++----
10 files changed, 491 insertions(+), 50 deletions(-)
--
2.20.1
J. Bruce Fields (12):
nfsd: persist nfsd filesystem across mounts
nfsd: rename cl_refcount
nfsd4: use reference count to free client
nfsd: add nfsd/clients directory
nfsd: make client/ directory names small ints
nfsd4: add a client info file
nfsd: copy client's address including port number to cl_addr
nfsd: add more information to client info file
nfsd4: add file to display list of client's opens
nfsd: show lock and deleg stateids
nfsd4: show layout stateids
nfsd: allow forced expiration of NFSv4 clients
fs/nfsd/netns.h | 6 +
fs/nfsd/nfs4state.c | 418 ++++++++++++++++++++++++++++++++++++---
fs/nfsd/nfsctl.c | 225 ++++++++++++++++++++-
fs/nfsd/nfsd.h | 11 ++
fs/nfsd/state.h | 7 +-
fs/seq_file.c | 17 ++
include/linux/seq_file.h | 2 +
7 files changed, 661 insertions(+), 25 deletions(-)
--
2.21.0
