249 lines
6.7 KiB
C
249 lines
6.7 KiB
C
/* $NetBSD: ops_cachefs.c,v 1.1.1.1 2000/06/07 00:52:22 dogcow Exp $ */
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/*
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* Copyright (c) 1997-2000 Erez Zadok
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* Copyright (c) 1990 Jan-Simon Pendry
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* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry at Imperial College, London.
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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 acknowledgment:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its 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 REGENTS 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 REGENTS 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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* %W% (Berkeley) %G%
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*
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* Id: ops_cachefs.c,v 1.3 2000/01/12 16:44:22 ezk Exp
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*
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*/
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/*
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* Caching filesystem (Solaris 2.x)
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <am_defs.h>
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#include <amd.h>
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/* forward declarations */
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static char *cachefs_match(am_opts *fo);
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static int cachefs_init(mntfs *mf);
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static int cachefs_fmount(mntfs *mf);
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static int cachefs_fumount(mntfs *mf);
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/*
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* Ops structure
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*/
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am_ops cachefs_ops =
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{
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"cachefs",
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cachefs_match,
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cachefs_init,
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amfs_auto_fmount,
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cachefs_fmount,
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amfs_auto_fumount,
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cachefs_fumount,
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amfs_error_lookuppn,
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amfs_error_readdir,
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0, /* cachefs_readlink */
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0, /* post-mount actions */
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0, /* post-umount actions */
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find_amfs_auto_srvr,
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FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO
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};
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/*
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* Check that f/s has all needed fields.
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* Returns: matched string if found, NULL otherwise.
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*/
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static char *
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cachefs_match(am_opts *fo)
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{
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/* sanity check */
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if (!fo->opt_rfs || !fo->opt_fs || !fo->opt_cachedir) {
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plog(XLOG_USER, "cachefs: must specify cachedir, rfs, and fs");
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return NULL;
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}
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#ifdef DEBUG
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dlog("CACHEFS: using cache directory \"%s\"", fo->opt_cachedir);
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#endif /* DEBUG */
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/* determine magic cookie to put in mtab */
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return strdup(fo->opt_cachedir);
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}
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/*
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* Initialize.
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* Returns: 0 if OK, non-zero (errno) if failed.
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*/
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static int
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cachefs_init(mntfs *mf)
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{
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/*
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* Save cache directory name
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*/
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if (mf->mf_refc == 1) {
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mf->mf_private = (voidp) strdup(mf->mf_fo->opt_cachedir);
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mf->mf_prfree = (void (*)(voidp)) free;
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}
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return 0;
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}
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/*
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* mntpt is the mount point ($fs) [XXX: was 'dir']
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* backdir is the mounted pathname ($rfs) [XXX: was 'fs_name']
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* cachedir is the cache directory ($cachedir)
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*/
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static int
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mount_cachefs(char *mntpt, char *backdir, char *cachedir, char *opts)
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{
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cachefs_args_t ca;
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mntent_t mnt;
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int flags;
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char *cp;
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MTYPE_TYPE type = MOUNT_TYPE_CACHEFS; /* F/S mount type */
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memset((voidp) &ca, 0, sizeof(ca)); /* Paranoid */
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/*
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* Fill in the mount structure
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*/
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memset((voidp) &mnt, 0, sizeof(mnt));
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mnt.mnt_dir = mntpt;
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mnt.mnt_fsname = backdir;
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mnt.mnt_type = MNTTAB_TYPE_CACHEFS;
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mnt.mnt_opts = opts;
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flags = compute_mount_flags(&mnt);
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/* Fill in cachefs mount arguments */
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/*
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* XXX: Caveats
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* (1) cache directory is NOT checked for sanity beforehand, nor is it
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* purged. Maybe it should be purged first?
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* (2) cache directory is NOT locked. Should we?
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*/
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/* mount flags */
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ca.cfs_options.opt_flags = CFS_WRITE_AROUND | CFS_ACCESS_BACKFS;
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/* cache population size */
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ca.cfs_options.opt_popsize = DEF_POP_SIZE; /* default: 64K */
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/* filegrp size */
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ca.cfs_options.opt_fgsize = DEF_FILEGRP_SIZE; /* default: 256 */
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/* CFS ID for file system (must be unique) */
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ca.cfs_fsid = cachedir;
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/* CFS fscdir name */
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memset(ca.cfs_cacheid, 0, sizeof(ca.cfs_cacheid));
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/* append cacheid and mountpoint */
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sprintf(ca.cfs_cacheid, "%s:%s", ca.cfs_fsid, mntpt);
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/* convert '/' to '_' (Solaris does that...) */
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cp = ca.cfs_cacheid;
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while ((cp = strpbrk(cp, "/")) != NULL)
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*cp = '_';
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/* path for this cache dir */
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ca.cfs_cachedir = cachedir;
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/* back filesystem dir */
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ca.cfs_backfs = backdir;
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/* same as nfs values (XXX: need to handle these options) */
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ca.cfs_acregmin = 0;
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ca.cfs_acregmax = 0;
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ca.cfs_acdirmin = 0;
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ca.cfs_acdirmax = 0;
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/*
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* Call generic mount routine
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*/
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return mount_fs(&mnt, flags, (caddr_t) &ca, 0, type, 0, NULL, mnttab_file_name);
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}
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static int
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cachefs_fmount(mntfs *mf)
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{
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int error;
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error = mount_cachefs(mf->mf_mount,
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mf->mf_fo->opt_rfs,
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mf->mf_fo->opt_cachedir,
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mf->mf_mopts);
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if (error) {
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errno = error;
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/* according to Solaris, if errno==ESRCH, "options to not match" */
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if (error == ESRCH)
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plog(XLOG_ERROR, "mount_cachefs: options to no match: %m");
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else
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plog(XLOG_ERROR, "mount_cachefs: %m");
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return error;
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}
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return 0;
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}
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static int
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cachefs_fumount(mntfs *mf)
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{
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int error;
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error = UMOUNT_FS(mf->mf_mount, mnttab_file_name);
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/*
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* In the case of cachefs, we must fsck the cache directory. Otherwise,
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* it will remain inconsistent, and the next cachefs mount will fail
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* with the error "no space left on device" (ENOSPC).
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*
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* XXX: this is hacky! use fork/exec/wait instead...
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*/
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if (!error) {
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char *cachedir = NULL;
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char cmd[128];
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cachedir = (char *) mf->mf_private;
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plog(XLOG_INFO, "running fsck on cache directory \"%s\"", cachedir);
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sprintf(cmd, "fsck -F cachefs %s", cachedir);
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system(cmd);
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}
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return error;
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}
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