2019-05-29 00:57:16 +08:00
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/* SPDX-License-Identifier: GPL-2.0-only */
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2005-09-10 04:04:20 +08:00
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/*
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* V9FS definitions.
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*
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2008-02-07 09:25:03 +08:00
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
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2005-09-10 04:04:20 +08:00
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*/
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2011-02-28 19:34:09 +08:00
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#ifndef FS_9P_V9FS_H
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#define FS_9P_V9FS_H
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2010-04-22 17:42:00 +08:00
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#include <linux/backing-dev.h>
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2021-06-30 05:37:05 +08:00
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#include <linux/netfs.h>
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2005-09-10 04:04:20 +08:00
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2008-03-05 21:08:09 +08:00
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/**
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* enum p9_session_flags - option flags for each 9P session
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2010-03-06 02:48:00 +08:00
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* @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions
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2010-03-09 01:33:04 +08:00
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* @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions
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2008-03-05 21:08:09 +08:00
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* @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy
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* @V9FS_ACCESS_USER: a new attach will be issued for every user (default)
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2011-01-26 07:40:54 +08:00
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* @V9FS_ACCESS_CLIENT: Just like user, but access check is performed on client.
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2008-03-05 21:08:09 +08:00
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* @V9FS_ACCESS_ANY: use a single attach for all users
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* @V9FS_ACCESS_MASK: bit mask of different ACCESS options
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2011-01-26 07:40:54 +08:00
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* @V9FS_POSIX_ACL: POSIX ACLs are enforced
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2008-03-05 21:08:09 +08:00
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*
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* Session flags reflect options selected by users at mount time
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*/
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2010-09-28 02:57:41 +08:00
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#define V9FS_ACCESS_ANY (V9FS_ACCESS_SINGLE | \
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V9FS_ACCESS_USER | \
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V9FS_ACCESS_CLIENT)
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#define V9FS_ACCESS_MASK V9FS_ACCESS_ANY
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2011-01-26 07:40:54 +08:00
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#define V9FS_ACL_MASK V9FS_POSIX_ACL
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2010-09-28 02:57:41 +08:00
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2008-03-05 21:08:09 +08:00
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enum p9_session_flags {
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2010-03-06 02:48:00 +08:00
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V9FS_PROTO_2000U = 0x01,
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2010-03-09 01:33:04 +08:00
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V9FS_PROTO_2000L = 0x02,
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2010-03-06 02:48:00 +08:00
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V9FS_ACCESS_SINGLE = 0x04,
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V9FS_ACCESS_USER = 0x08,
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2011-01-26 07:40:54 +08:00
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V9FS_ACCESS_CLIENT = 0x10,
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V9FS_POSIX_ACL = 0x20
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2008-03-05 21:08:09 +08:00
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};
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/* possible values of ->cache */
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/**
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* enum p9_cache_modes - user specified cache preferences
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* @CACHE_NONE: do not cache data, dentries, or directory contents (default)
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* @CACHE_LOOSE: cache data, dentries, and directory contents w/no consistency
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*
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* eventually support loose, tight, time, session, default always none
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*/
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enum p9_cache_modes {
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CACHE_NONE,
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2014-01-10 20:44:09 +08:00
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CACHE_MMAP,
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2008-03-05 21:08:09 +08:00
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CACHE_LOOSE,
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2009-09-24 02:00:27 +08:00
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CACHE_FSCACHE,
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2017-07-05 23:25:37 +08:00
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nr__p9_cache_modes
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2008-03-05 21:08:09 +08:00
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};
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/**
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* struct v9fs_session_info - per-instance session information
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* @flags: session options of type &p9_session_flags
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* @nodev: set to 1 to disable device mapping
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* @debug: debug level
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* @afid: authentication handle
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* @cache: cache mode of type &p9_cache_modes
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2009-09-24 02:00:27 +08:00
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* @cachetag: the tag of the cache associated with this session
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* @fscache: session cookie associated with FS-Cache
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2008-03-05 21:08:09 +08:00
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* @uname: string user name to mount hierarchy as
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* @aname: mount specifier for remote hierarchy
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* @maxdata: maximum data to be sent/recvd per protocol message
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* @dfltuid: default numeric userid to mount hierarchy as
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* @dfltgid: default numeric groupid to mount hierarchy as
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* @uid: if %V9FS_ACCESS_SINGLE, the numeric uid which mounted the hierarchy
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* @clnt: reference to 9P network client instantiated for this session
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2009-09-24 02:00:27 +08:00
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* @slist: reference to list of registered 9p sessions
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2008-03-05 21:08:09 +08:00
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*
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* This structure holds state for each session instance established during
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* a sys_mount() .
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*
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* Bugs: there seems to be a lot of state which could be condensed and/or
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* removed.
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*/
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2005-09-10 04:04:20 +08:00
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struct v9fs_session_info {
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/* options */
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2008-03-05 21:08:09 +08:00
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unsigned char flags;
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unsigned char nodev;
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unsigned short debug;
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unsigned int afid;
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unsigned int cache;
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2009-09-24 02:00:27 +08:00
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#ifdef CONFIG_9P_FSCACHE
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char *cachetag;
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2020-11-18 17:06:42 +08:00
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struct fscache_volume *fscache;
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2009-09-24 02:00:27 +08:00
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#endif
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2005-09-10 04:04:20 +08:00
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2007-10-18 03:31:07 +08:00
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char *uname; /* user name to mount as */
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char *aname; /* name of remote hierarchy being mounted */
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2008-02-07 09:25:03 +08:00
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unsigned int maxdata; /* max data for client interface */
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2013-01-31 03:57:40 +08:00
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kuid_t dfltuid; /* default uid/muid for legacy support */
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kgid_t dfltgid; /* default gid for legacy support */
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kuid_t uid; /* if ACCESS_SINGLE, the uid that has access */
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2007-07-11 06:57:28 +08:00
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struct p9_client *clnt; /* 9p client */
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2009-09-24 02:00:27 +08:00
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struct list_head slist; /* list of sessions registered with v9fs */
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2010-06-30 21:48:50 +08:00
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struct rw_semaphore rename_sem;
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2018-09-05 15:44:12 +08:00
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long session_lock_timeout; /* retry interval for blocking locks */
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2005-09-10 04:04:20 +08:00
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};
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2011-02-28 19:34:06 +08:00
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/* cache_validity flags */
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#define V9FS_INO_INVALID_ATTR 0x01
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2011-02-28 19:34:02 +08:00
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struct v9fs_inode {
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netfs: Fix gcc-12 warning by embedding vfs inode in netfs_i_context
While randstruct was satisfied with using an open-coded "void *" offset
cast for the netfs_i_context <-> inode casting, __builtin_object_size() as
used by FORTIFY_SOURCE was not as easily fooled. This was causing the
following complaint[1] from gcc v12:
In file included from include/linux/string.h:253,
from include/linux/ceph/ceph_debug.h:7,
from fs/ceph/inode.c:2:
In function 'fortify_memset_chk',
inlined from 'netfs_i_context_init' at include/linux/netfs.h:326:2,
inlined from 'ceph_alloc_inode' at fs/ceph/inode.c:463:2:
include/linux/fortify-string.h:242:25: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning]
242 | __write_overflow_field(p_size_field, size);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fix this by embedding a struct inode into struct netfs_i_context (which
should perhaps be renamed to struct netfs_inode). The struct inode
vfs_inode fields are then removed from the 9p, afs, ceph and cifs inode
structs and vfs_inode is then simply changed to "netfs.inode" in those
filesystems.
Further, rename netfs_i_context to netfs_inode, get rid of the
netfs_inode() function that converted a netfs_i_context pointer to an
inode pointer (that can now be done with &ctx->inode) and rename the
netfs_i_context() function to netfs_inode() (which is now a wrapper
around container_of()).
Most of the changes were done with:
perl -p -i -e 's/vfs_inode/netfs.inode/'g \
`git grep -l 'vfs_inode' -- fs/{9p,afs,ceph,cifs}/*.[ch]`
Kees suggested doing it with a pair structure[2] and a special
declarator to insert that into the network filesystem's inode
wrapper[3], but I think it's cleaner to embed it - and then it doesn't
matter if struct randomisation reorders things.
Dave Chinner suggested using a filesystem-specific VFS_I() function in
each filesystem to convert that filesystem's own inode wrapper struct
into the VFS inode struct[4].
Version #2:
- Fix a couple of missed name changes due to a disabled cifs option.
- Rename nfs_i_context to nfs_inode
- Use "netfs" instead of "nic" as the member name in per-fs inode wrapper
structs.
[ This also undoes commit 507160f46c55 ("netfs: gcc-12: temporarily
disable '-Wattribute-warning' for now") that is no longer needed ]
Fixes: bc899ee1c898 ("netfs: Add a netfs inode context")
Reported-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
cc: Jonathan Corbet <corbet@lwn.net>
cc: Eric Van Hensbergen <ericvh@gmail.com>
cc: Latchesar Ionkov <lucho@ionkov.net>
cc: Dominique Martinet <asmadeus@codewreck.org>
cc: Christian Schoenebeck <linux_oss@crudebyte.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Ilya Dryomov <idryomov@gmail.com>
cc: Steve French <smfrench@gmail.com>
cc: William Kucharski <william.kucharski@oracle.com>
cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
cc: Dave Chinner <david@fromorbit.com>
cc: linux-doc@vger.kernel.org
cc: v9fs-developer@lists.sourceforge.net
cc: linux-afs@lists.infradead.org
cc: ceph-devel@vger.kernel.org
cc: linux-cifs@vger.kernel.org
cc: samba-technical@lists.samba.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-hardening@vger.kernel.org
Link: https://lore.kernel.org/r/d2ad3a3d7bdd794c6efb562d2f2b655fb67756b9.camel@kernel.org/ [1]
Link: https://lore.kernel.org/r/20220517210230.864239-1-keescook@chromium.org/ [2]
Link: https://lore.kernel.org/r/20220518202212.2322058-1-keescook@chromium.org/ [3]
Link: https://lore.kernel.org/r/20220524101205.GI2306852@dread.disaster.area/ [4]
Link: https://lore.kernel.org/r/165296786831.3591209.12111293034669289733.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/165305805651.4094995.7763502506786714216.stgit@warthog.procyon.org.uk # v2
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-06-10 04:46:04 +08:00
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struct netfs_inode netfs; /* Netfslib context and vfs inode */
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2011-07-12 00:40:59 +08:00
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struct p9_qid qid;
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2011-02-28 19:34:06 +08:00
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unsigned int cache_validity;
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2011-02-28 19:34:03 +08:00
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struct p9_fid *writeback_fid;
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2011-03-08 19:09:46 +08:00
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struct mutex v_mutex;
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2011-02-28 19:34:02 +08:00
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};
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static inline struct v9fs_inode *V9FS_I(const struct inode *inode)
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{
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netfs: Fix gcc-12 warning by embedding vfs inode in netfs_i_context
While randstruct was satisfied with using an open-coded "void *" offset
cast for the netfs_i_context <-> inode casting, __builtin_object_size() as
used by FORTIFY_SOURCE was not as easily fooled. This was causing the
following complaint[1] from gcc v12:
In file included from include/linux/string.h:253,
from include/linux/ceph/ceph_debug.h:7,
from fs/ceph/inode.c:2:
In function 'fortify_memset_chk',
inlined from 'netfs_i_context_init' at include/linux/netfs.h:326:2,
inlined from 'ceph_alloc_inode' at fs/ceph/inode.c:463:2:
include/linux/fortify-string.h:242:25: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning]
242 | __write_overflow_field(p_size_field, size);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fix this by embedding a struct inode into struct netfs_i_context (which
should perhaps be renamed to struct netfs_inode). The struct inode
vfs_inode fields are then removed from the 9p, afs, ceph and cifs inode
structs and vfs_inode is then simply changed to "netfs.inode" in those
filesystems.
Further, rename netfs_i_context to netfs_inode, get rid of the
netfs_inode() function that converted a netfs_i_context pointer to an
inode pointer (that can now be done with &ctx->inode) and rename the
netfs_i_context() function to netfs_inode() (which is now a wrapper
around container_of()).
Most of the changes were done with:
perl -p -i -e 's/vfs_inode/netfs.inode/'g \
`git grep -l 'vfs_inode' -- fs/{9p,afs,ceph,cifs}/*.[ch]`
Kees suggested doing it with a pair structure[2] and a special
declarator to insert that into the network filesystem's inode
wrapper[3], but I think it's cleaner to embed it - and then it doesn't
matter if struct randomisation reorders things.
Dave Chinner suggested using a filesystem-specific VFS_I() function in
each filesystem to convert that filesystem's own inode wrapper struct
into the VFS inode struct[4].
Version #2:
- Fix a couple of missed name changes due to a disabled cifs option.
- Rename nfs_i_context to nfs_inode
- Use "netfs" instead of "nic" as the member name in per-fs inode wrapper
structs.
[ This also undoes commit 507160f46c55 ("netfs: gcc-12: temporarily
disable '-Wattribute-warning' for now") that is no longer needed ]
Fixes: bc899ee1c898 ("netfs: Add a netfs inode context")
Reported-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
cc: Jonathan Corbet <corbet@lwn.net>
cc: Eric Van Hensbergen <ericvh@gmail.com>
cc: Latchesar Ionkov <lucho@ionkov.net>
cc: Dominique Martinet <asmadeus@codewreck.org>
cc: Christian Schoenebeck <linux_oss@crudebyte.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Ilya Dryomov <idryomov@gmail.com>
cc: Steve French <smfrench@gmail.com>
cc: William Kucharski <william.kucharski@oracle.com>
cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
cc: Dave Chinner <david@fromorbit.com>
cc: linux-doc@vger.kernel.org
cc: v9fs-developer@lists.sourceforge.net
cc: linux-afs@lists.infradead.org
cc: ceph-devel@vger.kernel.org
cc: linux-cifs@vger.kernel.org
cc: samba-technical@lists.samba.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-hardening@vger.kernel.org
Link: https://lore.kernel.org/r/d2ad3a3d7bdd794c6efb562d2f2b655fb67756b9.camel@kernel.org/ [1]
Link: https://lore.kernel.org/r/20220517210230.864239-1-keescook@chromium.org/ [2]
Link: https://lore.kernel.org/r/20220518202212.2322058-1-keescook@chromium.org/ [3]
Link: https://lore.kernel.org/r/20220524101205.GI2306852@dread.disaster.area/ [4]
Link: https://lore.kernel.org/r/165296786831.3591209.12111293034669289733.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/165305805651.4094995.7763502506786714216.stgit@warthog.procyon.org.uk # v2
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-06-10 04:46:04 +08:00
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return container_of(inode, struct v9fs_inode, netfs.inode);
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2011-02-28 19:34:02 +08:00
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}
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2021-11-02 16:29:55 +08:00
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static inline struct fscache_cookie *v9fs_inode_cookie(struct v9fs_inode *v9inode)
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{
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#ifdef CONFIG_9P_FSCACHE
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2022-06-10 06:04:01 +08:00
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return netfs_i_cookie(&v9inode->netfs);
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2021-11-02 16:29:55 +08:00
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#else
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return NULL;
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#endif
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}
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2020-11-18 17:06:42 +08:00
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static inline struct fscache_volume *v9fs_session_cache(struct v9fs_session_info *v9ses)
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{
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#ifdef CONFIG_9P_FSCACHE
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return v9ses->fscache;
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#else
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return NULL;
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#endif
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}
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2017-07-05 23:25:37 +08:00
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extern int v9fs_show_options(struct seq_file *m, struct dentry *root);
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2021-10-01 14:34:44 +08:00
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struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
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const char *dev_name, char *data);
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2011-01-11 03:51:47 +08:00
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extern void v9fs_session_close(struct v9fs_session_info *v9ses);
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extern void v9fs_session_cancel(struct v9fs_session_info *v9ses);
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extern void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses);
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extern struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
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2021-10-01 14:34:44 +08:00
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unsigned int flags);
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2011-01-11 03:51:47 +08:00
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extern int v9fs_vfs_unlink(struct inode *i, struct dentry *d);
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extern int v9fs_vfs_rmdir(struct inode *i, struct dentry *d);
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2023-01-13 19:49:17 +08:00
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extern int v9fs_vfs_rename(struct mnt_idmap *idmap,
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2021-01-21 21:19:43 +08:00
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struct inode *old_dir, struct dentry *old_dentry,
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fs: make remaining filesystems use .rename2
This is trivial to do:
- add flags argument to foo_rename()
- check if flags is zero
- assign foo_rename() to .rename2 instead of .rename
This doesn't mean it's impossible to support RENAME_NOREPLACE for these
filesystems, but it is not trivial, like for local filesystems.
RENAME_NOREPLACE must guarantee atomicity (i.e. it shouldn't be possible
for a file to be created on one host while it is overwritten by rename on
another host).
Filesystems converted:
9p, afs, ceph, coda, ecryptfs, kernfs, lustre, ncpfs, nfs, ocfs2, orangefs.
After this, we can get rid of the duplicate interfaces for rename.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: David Howells <dhowells@redhat.com> [AFS]
Acked-by: Mike Marshall <hubcap@omnibond.com>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jan Harkes <jaharkes@cs.cmu.edu>
Cc: Tyler Hicks <tyhicks@canonical.com>
Cc: Oleg Drokin <oleg.drokin@intel.com>
Cc: Trond Myklebust <trond.myklebust@primarydata.com>
Cc: Mark Fasheh <mfasheh@suse.com>
2016-09-27 17:03:58 +08:00
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struct inode *new_dir, struct dentry *new_dentry,
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unsigned int flags);
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2011-02-28 19:34:02 +08:00
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extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses,
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struct p9_fid *fid,
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2011-07-06 19:02:31 +08:00
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struct super_block *sb, int new);
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2011-01-11 03:51:47 +08:00
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extern const struct inode_operations v9fs_dir_inode_operations_dotl;
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extern const struct inode_operations v9fs_file_inode_operations_dotl;
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extern const struct inode_operations v9fs_symlink_inode_operations_dotl;
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2021-06-30 05:37:05 +08:00
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extern const struct netfs_request_ops v9fs_req_ops;
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2011-02-28 19:34:02 +08:00
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extern struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses,
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struct p9_fid *fid,
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2011-07-06 19:02:31 +08:00
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struct super_block *sb, int new);
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2005-09-10 04:04:20 +08:00
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/* other default globals */
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2007-10-18 03:31:07 +08:00
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#define V9FS_PORT 564
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2005-09-10 04:04:20 +08:00
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#define V9FS_DEFUSER "nobody"
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#define V9FS_DEFANAME ""
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2013-01-31 03:57:40 +08:00
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#define V9FS_DEFUID KUIDT_INIT(-2)
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#define V9FS_DEFGID KGIDT_INIT(-2)
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2005-09-10 04:04:20 +08:00
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2007-07-11 06:57:28 +08:00
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static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
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{
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2021-10-01 14:34:44 +08:00
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return inode->i_sb->s_fs_info;
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2007-07-11 06:57:28 +08:00
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}
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2007-10-18 03:31:07 +08:00
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2011-03-08 19:09:50 +08:00
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static inline struct v9fs_session_info *v9fs_dentry2v9ses(struct dentry *dentry)
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{
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return dentry->d_sb->s_fs_info;
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}
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2010-03-06 02:48:00 +08:00
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static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses)
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2007-10-18 03:31:07 +08:00
|
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{
|
2010-03-06 02:48:00 +08:00
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return v9ses->flags & V9FS_PROTO_2000U;
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}
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static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses)
|
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|
|
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{
|
2010-03-09 01:33:04 +08:00
|
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return v9ses->flags & V9FS_PROTO_2000L;
|
2007-10-18 03:31:07 +08:00
|
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}
|
2011-01-11 03:51:47 +08:00
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|
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/**
|
2011-02-28 19:34:02 +08:00
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* v9fs_get_inode_from_fid - Helper routine to populate an inode by
|
2011-01-11 03:51:47 +08:00
|
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* issuing a attribute request
|
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* @v9ses: session information
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* @fid: fid to issue attribute request for
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* @sb: superblock on which to create inode
|
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|
|
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*
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|
|
|
*/
|
|
|
|
|
static inline struct inode *
|
2011-02-28 19:34:02 +08:00
|
|
|
v9fs_get_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
|
|
|
|
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struct super_block *sb)
|
2011-01-11 03:51:47 +08:00
|
|
|
{
|
|
|
|
|
if (v9fs_proto_dotl(v9ses))
|
2011-07-06 19:02:31 +08:00
|
|
|
return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 0);
|
2011-01-11 03:51:47 +08:00
|
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|
else
|
2011-07-06 19:02:31 +08:00
|
|
|
return v9fs_inode_from_fid(v9ses, fid, sb, 0);
|
2011-01-11 03:51:47 +08:00
|
|
|
}
|
2011-07-06 19:02:31 +08:00
|
|
|
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|
|
|
|
/**
|
|
|
|
|
* v9fs_get_new_inode_from_fid - Helper routine to populate an inode by
|
|
|
|
|
* issuing a attribute request
|
|
|
|
|
* @v9ses: session information
|
|
|
|
|
* @fid: fid to issue attribute request for
|
|
|
|
|
* @sb: superblock on which to create inode
|
|
|
|
|
*
|
|
|
|
|
*/
|
|
|
|
|
static inline struct inode *
|
|
|
|
|
v9fs_get_new_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
|
|
|
|
|
struct super_block *sb)
|
|
|
|
|
{
|
|
|
|
|
if (v9fs_proto_dotl(v9ses))
|
|
|
|
|
return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 1);
|
|
|
|
|
else
|
|
|
|
|
return v9fs_inode_from_fid(v9ses, fid, sb, 1);
|
|
|
|
|
}
|
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|
2011-02-28 19:34:09 +08:00
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#endif
|
