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.
99 lines
3.9 KiB
C
99 lines
3.9 KiB
C
/* $NetBSD: smbfs_node.h,v 1.12 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_node.h,v 1.1 2001/04/10 07:59:05 bp Exp
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*/
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#ifndef _FS_SMBFS_SMBFS_NODE_H_
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#define _FS_SMBFS_SMBFS_NODE_H_
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#include <sys/hash.h> /* for hash32_strn() */
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#include <miscfs/genfs/genfs_node.h> /* for struct genfs_node */
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#define SMBFS_ROOT_INO 2 /* just like in UFS */
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/* Bits for smbnode.n_flag */
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#define NFLUSHINPROG 0x0001
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#define NFLUSHWANT 0x0002 /* they should gone ... */
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#define NMODIFIED 0x0004 /* bogus, until async IO implemented */
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/*efine NNEW 0x0008*//* smb/vnode has been allocated */
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#define NREFPARENT 0x0010 /* node holds parent from recycling */
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#define NOPEN 0x2000 /* file is open */
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#define SMBFS_ATTRTIMO 5 /* Attribute cache timeout in sec */
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struct smbfs_fctx;
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struct smbnode {
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struct genfs_node n_gnode;
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int n_flag;
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struct vnode * n_parent;
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struct vnode * n_vnode;
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struct smbmount * n_mount;
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time_t n_attrage; /* attributes cache time */
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time_t n_ctime; /* Prev create time. */
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time_t n_nctime; /* last neg cache entry (dir) */
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struct timespec n_mtime; /* modify time */
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struct timespec n_atime; /* last access time */
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u_quad_t n_size;
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long n_ino;
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int n_dosattr;
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u_int16_t n_fid; /* file handle */
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int n_rwstate; /* granted access mode */
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u_char n_nmlen;
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u_char * n_name;
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struct smbfs_fctx * n_dirseq; /* ff context */
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long n_dirofs; /* last ff offset */
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struct lockf * n_lockf; /* Locking records of file */
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LIST_ENTRY(smbnode) n_hash;
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};
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#define VTOSMB(vp) ((struct smbnode *)(vp)->v_data)
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#define SMBTOV(np) ((struct vnode *)(np)->n_vnode)
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struct smbfattr;
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int smbfs_inactive(void *);
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int smbfs_reclaim(void *);
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int smbfs_nget(struct mount *, struct vnode *, const char *, int,
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struct smbfattr *, struct vnode **);
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#define smbfs_hash(x, y) hash32_strn((x), (y), HASH32_STR_INIT)
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int smbfs_readvnode(struct vnode *, struct uio *, kauth_cred_t);
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int smbfs_writevnode(struct vnode *, struct uio *, kauth_cred_t, int);
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void smbfs_attr_cacheenter(struct vnode *, struct smbfattr *);
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int smbfs_attr_cachelookup(struct vnode * ,struct vattr *);
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#define smbfs_attr_cacheremove(vp) VTOSMB(vp)->n_attrage = 0
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#endif /* _FS_SMBFS_SMBFS_NODE_H_ */
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