/* $NetBSD: ops_cachefs.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */ /* * Copyright (c) 1997-2014 Erez Zadok * Copyright (c) 1990 Jan-Simon Pendry * Copyright (c) 1990 Imperial College of Science, Technology & Medicine * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * * File: am-utils/amd/ops_cachefs.c * */ /* * Caching filesystem (Solaris 2.x) */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include /* forward declarations */ static char *cachefs_match(am_opts *fo); static int cachefs_init(mntfs *mf); static int cachefs_mount(am_node *am, mntfs *mf); static int cachefs_umount(am_node *am, mntfs *mf); /* * Ops structure */ am_ops cachefs_ops = { "cachefs", cachefs_match, cachefs_init, cachefs_mount, cachefs_umount, amfs_error_lookup_child, amfs_error_mount_child, amfs_error_readdir, 0, /* cachefs_readlink */ 0, /* cachefs_mounted */ 0, /* cachefs_umounted */ amfs_generic_find_srvr, 0, /* cachefs_get_wchan */ FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */ #ifdef HAVE_FS_AUTOFS AUTOFS_CACHEFS_FS_FLAGS, #endif /* HAVE_FS_AUTOFS */ }; /* * Check that f/s has all needed fields. * Returns: matched string if found, NULL otherwise. */ static char * cachefs_match(am_opts *fo) { /* sanity check */ if (!fo->opt_rfs || !fo->opt_fs || !fo->opt_cachedir) { plog(XLOG_USER, "cachefs: must specify cachedir, rfs, and fs"); return NULL; } dlog("CACHEFS: using cache directory \"%s\"", fo->opt_cachedir); /* determine magic cookie to put in mtab */ return xstrdup(fo->opt_cachedir); } /* * Initialize. * Returns: 0 if OK, non-zero (errno) if failed. */ static int cachefs_init(mntfs *mf) { /* * Save cache directory name */ if (!mf->mf_private) { mf->mf_private = (voidp) xstrdup(mf->mf_fo->opt_cachedir); mf->mf_prfree = (void (*)(voidp)) free; } return 0; } /* * mntpt is the mount point ($fs) [XXX: was 'dir'] * backdir is the mounted pathname ($rfs) [XXX: was 'fs_name'] * cachedir is the cache directory ($cachedir) */ static int mount_cachefs(char *mntdir, char *backdir, char *cachedir, char *opts, int on_autofs) { cachefs_args_t ca; mntent_t mnt; int flags; char *cp; MTYPE_TYPE type = MOUNT_TYPE_CACHEFS; /* F/S mount type */ memset((voidp) &ca, 0, sizeof(ca)); /* Paranoid */ /* * Fill in the mount structure */ memset((voidp) &mnt, 0, sizeof(mnt)); mnt.mnt_dir = mntdir; mnt.mnt_fsname = backdir; mnt.mnt_type = MNTTAB_TYPE_CACHEFS; mnt.mnt_opts = opts; flags = compute_mount_flags(&mnt); #ifdef HAVE_FS_AUTOFS if (on_autofs) flags |= autofs_compute_mount_flags(&mnt); #endif /* HAVE_FS_AUTOFS */ /* Fill in cachefs mount arguments */ /* * XXX: Caveats * (1) cache directory is NOT checked for sanity beforehand, nor is it * purged. Maybe it should be purged first? * (2) cache directory is NOT locked. Should we? */ /* mount flags */ ca.cfs_options.opt_flags = CFS_WRITE_AROUND | CFS_ACCESS_BACKFS; /* cache population size */ ca.cfs_options.opt_popsize = DEF_POP_SIZE; /* default: 64K */ /* filegrp size */ ca.cfs_options.opt_fgsize = DEF_FILEGRP_SIZE; /* default: 256 */ /* CFS ID for file system (must be unique) */ ca.cfs_fsid = cachedir; /* CFS fscdir name */ memset(ca.cfs_cacheid, 0, sizeof(ca.cfs_cacheid)); /* * Append cacheid and mountpoint. * sizeof(cfs_cacheid) should be C_MAX_MOUNT_FSCDIRNAME as per * (checked on Solaris 8). */ xsnprintf(ca.cfs_cacheid, sizeof(ca.cfs_cacheid), "%s:%s", ca.cfs_fsid, mntdir); /* convert '/' to '_' (Solaris does that...) */ cp = ca.cfs_cacheid; while ((cp = strpbrk(cp, "/")) != NULL) *cp = '_'; /* path for this cache dir */ ca.cfs_cachedir = cachedir; /* back filesystem dir */ ca.cfs_backfs = backdir; /* same as nfs values (XXX: need to handle these options) */ ca.cfs_acregmin = 0; ca.cfs_acregmax = 0; ca.cfs_acdirmin = 0; ca.cfs_acdirmax = 0; /* * Call generic mount routine */ return mount_fs(&mnt, flags, (caddr_t) &ca, 0, type, 0, NULL, mnttab_file_name, on_autofs); } static int cachefs_mount(am_node *am, mntfs *mf) { int on_autofs = mf->mf_flags & MFF_ON_AUTOFS; int error; error = mount_cachefs(mf->mf_mount, mf->mf_fo->opt_rfs, mf->mf_fo->opt_cachedir, mf->mf_mopts, on_autofs); if (error) { errno = error; /* according to Solaris, if errno==ESRCH, "options to not match" */ if (error == ESRCH) plog(XLOG_ERROR, "mount_cachefs: options to no match: %m"); else plog(XLOG_ERROR, "mount_cachefs: %m"); return error; } return 0; } static int cachefs_umount(am_node *am, mntfs *mf) { int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0; int error; error = UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags); /* * In the case of cachefs, we must fsck the cache directory. Otherwise, * it will remain inconsistent, and the next cachefs mount will fail * with the error "no space left on device" (ENOSPC). * * XXX: this is hacky! use fork/exec/wait instead... */ if (!error) { char *cachedir = NULL; char cmd[128]; cachedir = (char *) mf->mf_private; plog(XLOG_INFO, "running fsck on cache directory \"%s\"", cachedir); xsnprintf(cmd, sizeof(cmd), "fsck -F cachefs %s", cachedir); system(cmd); } return error; }