e0fd5659c6
reference to the parent directory's vnode instead of its smbnode to avoid a use-after-free bug causing a panic when a smbfs mount is forcefully unmounted. Keep trying to flush the vnode list for the mount while some are still busy and we are making progress towards making them not busy. This stops attempts to unmount idle smbfs mounts failing with EBUSY. The easiest way to reproduce the above problem, from what I have seen is: 1) Assume /s is a smbfs mount point. 2) mount /s 3) stat /s/foo/1 4) umount /s Returns error because the file system is busy. 5) Shutdown the machine: panic in smbfs_reclaim because vrele accesses already-released memory.
102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
/* $NetBSD: smbfs.h,v 1.15 2006/11/02 17:34:21 jmmv Exp $ */
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/*
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* Copyright (c) 2000-2001, Boris Popov
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Boris Popov.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* FreeBSD: src/sys/fs/smbfs/smbfs.h,v 1.3 2001/12/02 08:56:58 bp Exp
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*/
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#ifndef _FS_SMBFS_SMBFS_H_
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#define _FS_SMBFS_SMBFS_H_
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#define SMBFS_VERMAJ 1
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#define SMBFS_VERMIN 1013
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#define SMBFS_VERSION (SMBFS_VERMAJ*100000 + SMBFS_VERMIN)
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#define SMBFS_VFSNAME "smbfs"
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/* Values for flags */
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#define SMBFS_MOUNT_SOFT 0x0001
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#define SMBFS_MOUNT_INTR 0x0002
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#define SMBFS_MOUNT_STRONG 0x0004
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#define SMBFS_MOUNT_HAVE_NLS 0x0008
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#define SMBFS_MOUNT_NO_LONG 0x0010
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#define SMBFS_MAXPATHCOMP 256 /* maximum number of path components */
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/* Layout of the mount control block for a netware file system. */
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struct smbfs_args {
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int version;
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int dev_fd; /* descriptor of open nsmb device */
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u_int flags;
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uid_t uid;
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gid_t gid;
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mode_t file_mode;
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mode_t dir_mode;
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int caseopt;
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};
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#ifdef _KERNEL
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struct smbnode;
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struct smb_share;
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struct u_cred;
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struct vop_ioctl_args;
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struct buf;
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struct smbmount {
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struct smbfs_args sm_args;
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struct mount * sm_mp;
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struct smbnode * sm_root;
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kauth_cred_t sm_owner;
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int sm_flags;
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long sm_nextino;
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struct smb_share * sm_share;
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/* struct simplelock sm_npslock;*/
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struct smbnode * sm_npstack[SMBFS_MAXPATHCOMP];
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int sm_caseopt;
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struct lock sm_hashlock;
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LIST_HEAD(smbnode_hashhead, smbnode) *sm_hash;
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u_long sm_hashlen;
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int sm_didrele;
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};
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#define VFSTOSMBFS(mp) ((struct smbmount *)((mp)->mnt_data))
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#define SMBFSTOVFS(smp) ((struct mount *)((smp)->sm_mp))
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#define VTOVFS(vp) ((vp)->v_mount)
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#define VTOSMBFS(vp) (VFSTOSMBFS(VTOVFS(vp)))
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int smbfs_doio(struct buf *, kauth_cred_t, struct lwp *);
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int smbfs_vinvalbuf(struct vnode *, int, kauth_cred_t, struct lwp *, int);
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int smbfs_kqfilter(void *);
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#endif /* KERNEL */
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#endif /* _FS_SMBFS_SMBFS_H_ */
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