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874c8ca1e6
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 507160f46c ("netfs: gcc-12: temporarily
disable '-Wattribute-warning' for now") that is no longer needed ]
Fixes: bc899ee1c8 ("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>
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Ceph cache definitions.
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*
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* Copyright (C) 2013 by Adfin Solutions, Inc. All Rights Reserved.
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* Written by Milosz Tanski (milosz@adfin.com)
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*/
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#include <linux/ceph/ceph_debug.h>
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#include <linux/fs_context.h>
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#include "super.h"
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#include "cache.h"
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void ceph_fscache_register_inode_cookie(struct inode *inode)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
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/* No caching for filesystem? */
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if (!fsc->fscache)
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return;
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/* Regular files only */
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if (!S_ISREG(inode->i_mode))
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return;
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/* Only new inodes! */
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if (!(inode->i_state & I_NEW))
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return;
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WARN_ON_ONCE(ci->netfs.cache);
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ci->netfs.cache =
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fscache_acquire_cookie(fsc->fscache, 0,
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&ci->i_vino, sizeof(ci->i_vino),
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&ci->i_version, sizeof(ci->i_version),
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i_size_read(inode));
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}
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void ceph_fscache_unregister_inode_cookie(struct ceph_inode_info *ci)
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{
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fscache_relinquish_cookie(ceph_fscache_cookie(ci), false);
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}
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void ceph_fscache_use_cookie(struct inode *inode, bool will_modify)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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fscache_use_cookie(ceph_fscache_cookie(ci), will_modify);
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}
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void ceph_fscache_unuse_cookie(struct inode *inode, bool update)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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if (update) {
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loff_t i_size = i_size_read(inode);
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fscache_unuse_cookie(ceph_fscache_cookie(ci),
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&ci->i_version, &i_size);
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} else {
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fscache_unuse_cookie(ceph_fscache_cookie(ci), NULL, NULL);
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}
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}
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void ceph_fscache_update(struct inode *inode)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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loff_t i_size = i_size_read(inode);
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fscache_update_cookie(ceph_fscache_cookie(ci), &ci->i_version, &i_size);
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}
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void ceph_fscache_invalidate(struct inode *inode, bool dio_write)
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{
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struct ceph_inode_info *ci = ceph_inode(inode);
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fscache_invalidate(ceph_fscache_cookie(ci),
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&ci->i_version, i_size_read(inode),
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dio_write ? FSCACHE_INVAL_DIO_WRITE : 0);
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}
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int ceph_fscache_register_fs(struct ceph_fs_client* fsc, struct fs_context *fc)
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{
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const struct ceph_fsid *fsid = &fsc->client->fsid;
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const char *fscache_uniq = fsc->mount_options->fscache_uniq;
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size_t uniq_len = fscache_uniq ? strlen(fscache_uniq) : 0;
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char *name;
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int err = 0;
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name = kasprintf(GFP_KERNEL, "ceph,%pU%s%s", fsid, uniq_len ? "," : "",
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uniq_len ? fscache_uniq : "");
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if (!name)
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return -ENOMEM;
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fsc->fscache = fscache_acquire_volume(name, NULL, NULL, 0);
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if (IS_ERR_OR_NULL(fsc->fscache)) {
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errorfc(fc, "Unable to register fscache cookie for %s", name);
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err = fsc->fscache ? PTR_ERR(fsc->fscache) : -EOPNOTSUPP;
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fsc->fscache = NULL;
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}
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kfree(name);
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return err;
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}
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void ceph_fscache_unregister_fs(struct ceph_fs_client* fsc)
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{
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fscache_relinquish_volume(fsc->fscache, NULL, false);
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}
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