2 * Copyright (c) 1997-1999 Erez Zadok
3 * Copyright (c) 1990 Jan-Simon Pendry
4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1990 The Regents of the University of California.
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgment:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * $Id: ops_cachefs.c,v 1.2 1999/01/10 21:53:49 ezk Exp $
46 * Caching filesystem (Solaris 2.x)
51 #endif /* HAVE_CONFIG_H */
55 /* forward declarations */
56 static char *cachefs_match(am_opts *fo);
57 static int cachefs_init(mntfs *mf);
58 static int cachefs_fmount(mntfs *mf);
59 static int cachefs_fumount(mntfs *mf);
76 0, /* cachefs_readlink */
77 0, /* post-mount actions */
78 0, /* post-umount actions */
80 FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO
85 * Check that f/s has all needed fields.
86 * Returns: matched string if found, NULL otherwise.
89 cachefs_match(am_opts *fo)
92 if (!fo->opt_rfs || !fo->opt_fs || !fo->opt_cachedir) {
93 plog(XLOG_USER, "cachefs: must specify cachedir, rfs, and fs");
98 dlog("CACHEFS: using cache directory \"%s\"", fo->opt_cachedir);
101 /* determine magic cookie to put in mtab */
102 return strdup(fo->opt_cachedir);
108 * Returns: 0 if OK, non-zero (errno) if failed.
111 cachefs_init(mntfs *mf)
114 * Save cache directory name
116 if (mf->mf_refc == 1) {
117 mf->mf_private = (voidp) strdup(mf->mf_fo->opt_cachedir);
118 mf->mf_prfree = (void (*)(voidp)) free;
126 * mntpt is the mount point ($fs) [XXX: was 'dir']
127 * backdir is the mounted pathname ($rfs) [XXX: was 'fs_name']
128 * cachedir is the cache directory ($cachedir)
131 mount_cachefs(char *mntpt, char *backdir, char *cachedir, char *opts)
137 MTYPE_TYPE type = MOUNT_TYPE_CACHEFS; /* F/S mount type */
139 memset((voidp) &ca, 0, sizeof(ca)); /* Paranoid */
142 * Fill in the mount structure
144 memset((voidp) &mnt, 0, sizeof(mnt));
146 mnt.mnt_fsname = backdir;
147 mnt.mnt_type = MNTTAB_TYPE_CACHEFS;
150 flags = compute_mount_flags(&mnt);
152 /* Fill in cachefs mount arguments */
156 * (1) cache directory is NOT checked for sanity beforehand, nor is it
157 * purged. Maybe it should be purged first?
158 * (2) cache directory is NOT locked. Should we?
162 ca.cfs_options.opt_flags = CFS_WRITE_AROUND | CFS_ACCESS_BACKFS;
163 /* cache population size */
164 ca.cfs_options.opt_popsize = DEF_POP_SIZE; /* default: 64K */
166 ca.cfs_options.opt_fgsize = DEF_FILEGRP_SIZE; /* default: 256 */
168 /* CFS ID for file system (must be unique) */
169 ca.cfs_fsid = cachedir;
171 /* CFS fscdir name */
172 memset(ca.cfs_cacheid, 0, sizeof(ca.cfs_cacheid));
173 /* append cacheid and mountpoint */
174 sprintf(ca.cfs_cacheid, "%s:%s", ca.cfs_fsid, mntpt);
175 /* convert '/' to '_' (Solaris does that...) */
177 while ((cp = strpbrk(cp, "/")) != NULL)
180 /* path for this cache dir */
181 ca.cfs_cachedir = cachedir;
183 /* back filesystem dir */
184 ca.cfs_backfs = backdir;
186 /* same as nfs values (XXX: need to handle these options) */
193 * Call generic mount routine
195 return mount_fs(&mnt, flags, (caddr_t) &ca, 0, type, 0, NULL, mnttab_file_name);
200 cachefs_fmount(mntfs *mf)
204 error = mount_cachefs(mf->mf_mount,
206 mf->mf_fo->opt_cachedir,
210 /* according to Solaris, if errno==ESRCH, "options to not match" */
212 plog(XLOG_ERROR, "mount_cachefs: options to no match: %m");
214 plog(XLOG_ERROR, "mount_cachefs: %m");
223 cachefs_fumount(mntfs *mf)
227 error = UMOUNT_FS(mf->mf_mount, mnttab_file_name);
230 * In the case of cachefs, we must fsck the cache directory. Otherwise,
231 * it will remain inconsistent, and the next cachefs mount will fail
232 * with the error "no space left on device" (ENOSPC).
234 * XXX: this is hacky! use fork/exec/wait instead...
237 char *cachedir = NULL;
240 cachedir = (char *) mf->mf_private;
241 plog(XLOG_INFO, "running fsck on cache directory \"%s\"", cachedir);
242 sprintf(cmd, "fsck -F cachefs %s", cachedir);