/* $NetBSD: filecore_vfsops.c,v 1.81 2017/04/17 08:32:00 hannken Exp $ */ /*- * Copyright (c) 1994 The Regents of the University of California. * All rights reserved. * * 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. * * filecore_vfsops.c 1.1 1998/6/26 */ /*- * Copyright (c) 1998 Andrew McMurry * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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. * * filecore_vfsops.c 1.1 1998/6/26 */ #include __KERNEL_RCSID(0, "$NetBSD: filecore_vfsops.c,v 1.81 2017/04/17 08:32:00 hannken Exp $"); #if defined(_KERNEL_OPT) #include "opt_compat_netbsd.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MODULE(MODULE_CLASS_VFS, filecore, NULL); static struct sysctllog *filecore_sysctl_log; extern const struct vnodeopv_desc filecore_vnodeop_opv_desc; const struct vnodeopv_desc * const filecore_vnodeopv_descs[] = { &filecore_vnodeop_opv_desc, NULL, }; struct vfsops filecore_vfsops = { .vfs_name = MOUNT_FILECORE, .vfs_min_mount_data = sizeof (struct filecore_args), .vfs_mount = filecore_mount, .vfs_start = filecore_start, .vfs_unmount = filecore_unmount, .vfs_root = filecore_root, .vfs_quotactl = (void *)eopnotsupp, .vfs_statvfs = filecore_statvfs, .vfs_sync = filecore_sync, .vfs_vget = filecore_vget, .vfs_loadvnode = filecore_loadvnode, .vfs_fhtovp = filecore_fhtovp, .vfs_vptofh = filecore_vptofh, .vfs_init = filecore_init, .vfs_reinit = filecore_reinit, .vfs_done = filecore_done, .vfs_snapshot = (void *)eopnotsupp, .vfs_extattrctl = vfs_stdextattrctl, .vfs_suspendctl = genfs_suspendctl, .vfs_renamelock_enter = genfs_renamelock_enter, .vfs_renamelock_exit = genfs_renamelock_exit, .vfs_fsync = (void *)eopnotsupp, .vfs_opv_descs = filecore_vnodeopv_descs }; static int filecore_modcmd(modcmd_t cmd, void *arg) { int error; switch (cmd) { case MODULE_CMD_INIT: error = vfs_attach(&filecore_vfsops); if (error != 0) break; sysctl_createv(&filecore_sysctl_log, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "filecore", SYSCTL_DESCR("Acorn FILECORE file system"), NULL, 0, NULL, 0, CTL_VFS, 19, CTL_EOL); /* * XXX the "19" above could be dynamic, thereby eliminating * one more instance of the "number to vfs" mapping problem, * but "19" is the order as taken from sys/mount.h */ break; case MODULE_CMD_FINI: error = vfs_detach(&filecore_vfsops); if (error != 0) break; sysctl_teardown(&filecore_sysctl_log); break; default: error = ENOTTY; break; } return (error); } /* * Called by vfs_mountroot when iso is going to be mounted as root. * * Name is updated by mount(8) after booting. */ static int filecore_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct filecore_args *argp); #if 0 int filecore_mountroot(void) { struct mount *mp; extern struct vnode *rootvp; struct proc *p = curproc; /* XXX */ int error; struct filecore_args args; if (device_class(root_device) != DV_DISK) return (ENODEV); /* * Get vnodes for swapdev and rootdev. */ if (bdevvp(rootdev, &rootvp)) panic("filecore_mountroot: can't setup rootvp"); if ((error = vfs_rootmountalloc(MOUNT_FILECORE, "root_device", &mp)) != 0) return (error); args.flags = FILECOREMNT_ROOT; if ((error = filecore_mountfs(rootvp, mp, p, &args)) != 0) { vfs_unbusy(mp); vfs_rele(mp); return (error); } mountlist_append(mp); (void)filecore_statvfs(mp, &mp->mnt_stat, p); vfs_unbusy(mp); return (0); } #endif /* * VFS Operations. * * mount system call */ int filecore_mount(struct mount *mp, const char *path, void *data, size_t *data_len) { struct lwp *l = curlwp; struct vnode *devvp; struct filecore_args *args = data; int error; struct filecore_mnt *fcmp = NULL; if (args == NULL) return EINVAL; if (*data_len < sizeof *args) return EINVAL; if (mp->mnt_flag & MNT_GETARGS) { fcmp = VFSTOFILECORE(mp); if (fcmp == NULL) return EIO; args->flags = fcmp->fc_mntflags; args->uid = fcmp->fc_uid; args->gid = fcmp->fc_gid; args->fspec = NULL; *data_len = sizeof *args; return 0; } if ((mp->mnt_flag & MNT_RDONLY) == 0) return (EROFS); if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL) return EINVAL; /* * Not an update, or updating the name: look up the name * and verify that it refers to a sensible block device. */ error = namei_simple_user(args->fspec, NSM_FOLLOW_NOEMULROOT, &devvp); if (error != 0) return (error); if (devvp->v_type != VBLK) { vrele(devvp); return ENOTBLK; } if (bdevsw_lookup(devvp->v_rdev) == NULL) { vrele(devvp); return ENXIO; } /* * If mount by non-root, then verify that user has necessary * permissions on the device. */ vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(VREAD)); VOP_UNLOCK(devvp); if (error) { vrele(devvp); return (error); } if ((mp->mnt_flag & MNT_UPDATE) == 0) error = filecore_mountfs(devvp, mp, l, args); else { fcmp = VFSTOFILECORE(mp); if (devvp != fcmp->fc_devvp) error = EINVAL; /* needs translation */ else vrele(devvp); } if (error) { vrele(devvp); return error; } fcmp = VFSTOFILECORE(mp); return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE, mp->mnt_op->vfs_name, mp, l); } /* * Common code for mount and mountroot */ static int filecore_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l, struct filecore_args *argp) { struct filecore_mnt *fcmp = (struct filecore_mnt *)0; struct buf *bp = NULL; dev_t dev = devvp->v_rdev; int error = EINVAL; int ronly = (mp->mnt_flag & MNT_RDONLY) != 0; struct filecore_disc_record *fcdr; unsigned map; unsigned log2secsize; if (!ronly) return EROFS; if ((error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0)) != 0) return (error); vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED); VOP_UNLOCK(devvp); if (error) return error; /* Read the filecore boot block to check FS validity and to find the map */ error = bread(devvp, FILECORE_BOOTBLOCK_BLKN, FILECORE_BOOTBLOCK_SIZE, 0, &bp); #ifdef FILECORE_DEBUG_BR printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp, FILECORE_BOOTBLOCK_BLKN, FILECORE_BOOTBLOCK_SIZE, bp, error); #endif if (error != 0) goto out; KASSERT(bp != NULL); if (filecore_bbchecksum(bp->b_data) != 0) { error = EINVAL; goto out; } fcdr = (struct filecore_disc_record *)((char *)(bp->b_data) + FILECORE_BB_DISCREC); map = ((((8 << fcdr->log2secsize) - fcdr->zone_spare) * (fcdr->nzones / 2) - 8 * FILECORE_DISCREC_SIZE) << fcdr->log2bpmb) >> fcdr->log2secsize; log2secsize = fcdr->log2secsize; #ifdef FILECORE_DEBUG_BR printf("brelse(%p) vf1\n", bp); #endif brelse(bp, BC_AGE); bp = NULL; /* Read the bootblock in the map */ error = bread(devvp, map, 1 << log2secsize, 0, &bp); #ifdef FILECORE_DEBUG_BR printf("bread(%p, %x, %d, CRED, %p)=%d\n", devvp, map, 1 << log2secsize, bp, error); #endif if (error != 0) goto out; fcdr = (struct filecore_disc_record *)((char *)(bp->b_data) + 4); fcmp = kmem_zalloc(sizeof(*fcmp), KM_SLEEP); if (fcdr->log2bpmb > fcdr->log2secsize) fcmp->log2bsize = fcdr->log2bpmb; else fcmp->log2bsize = fcdr->log2secsize; fcmp->blksize = 1 << fcmp->log2bsize; memcpy(&fcmp->drec, fcdr, sizeof(*fcdr)); fcmp->map = map; fcmp->idspz = ((8 << fcdr->log2secsize) - fcdr->zone_spare) / (fcdr->idlen + 1); fcmp->mask = (1 << fcdr->idlen) - 1; if (fcdr->big_flag & 1) { fcmp->nblks = ((((u_int64_t)fcdr->disc_size_2) << 32) + fcdr->disc_size) / fcmp->blksize; } else { fcmp->nblks=fcdr->disc_size / fcmp->blksize; } #ifdef FILECORE_DEBUG_BR printf("brelse(%p) vf2\n", bp); #endif brelse(bp, BC_AGE); bp = NULL; mp->mnt_data = fcmp; mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev; mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_FILECORE); mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; mp->mnt_stat.f_namemax = 10; mp->mnt_flag |= MNT_LOCAL; mp->mnt_dev_bshift = fcdr->log2secsize; mp->mnt_fs_bshift = fcmp->log2bsize; fcmp->fc_mountp = mp; fcmp->fc_dev = dev; fcmp->fc_devvp = devvp; fcmp->fc_mntflags = argp->flags; if (argp->flags & FILECOREMNT_USEUID) { fcmp->fc_uid = kauth_cred_getuid(l->l_cred); fcmp->fc_gid = kauth_cred_getgid(l->l_cred); } else { fcmp->fc_uid = argp->uid; fcmp->fc_gid = argp->gid; } return 0; out: if (bp) { #ifdef FILECORE_DEBUG_BR printf("brelse(%p) vf3\n", bp); #endif brelse(bp, 0); } vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED); VOP_UNLOCK(devvp); return error; } /* * Make a filesystem operational. * Nothing to do at the moment. */ /* ARGSUSED */ int filecore_start(struct mount *mp, int flags) { return 0; } /* * unmount system call */ int filecore_unmount(struct mount *mp, int mntflags) { struct filecore_mnt *fcmp; int error, flags = 0; if (mntflags & MNT_FORCE) flags |= FORCECLOSE; if ((error = vflush(mp, NULLVP, flags)) != 0) return (error); fcmp = VFSTOFILECORE(mp); if (fcmp->fc_devvp->v_type != VBAD) spec_node_setmountedfs(fcmp->fc_devvp, NULL); vn_lock(fcmp->fc_devvp, LK_EXCLUSIVE | LK_RETRY); error = VOP_CLOSE(fcmp->fc_devvp, FREAD, NOCRED); vput(fcmp->fc_devvp); kmem_free(fcmp, sizeof(*fcmp)); mp->mnt_data = NULL; mp->mnt_flag &= ~MNT_LOCAL; return (error); } /* * Return root of a filesystem */ int filecore_root(struct mount *mp, struct vnode **vpp) { struct vnode *nvp; int error; if ((error = VFS_VGET(mp, FILECORE_ROOTINO, &nvp)) != 0) return (error); *vpp = nvp; return (0); } /* * Get file system statistics. */ int filecore_statvfs(struct mount *mp, struct statvfs *sbp) { struct filecore_mnt *fcmp = VFSTOFILECORE(mp); sbp->f_bsize = fcmp->blksize; sbp->f_frsize = sbp->f_bsize; /* XXX */ sbp->f_iosize = sbp->f_bsize; /* XXX */ sbp->f_blocks = fcmp->nblks; sbp->f_bfree = 0; /* total free blocks */ sbp->f_bavail = 0; /* blocks free for non superuser */ sbp->f_bresvd = 0; /* reserved blocks */ sbp->f_files = 0; /* total files */ sbp->f_ffree = 0; /* free file nodes for non superuser */ sbp->f_favail = 0; /* free file nodes */ sbp->f_fresvd = 0; /* reserved file nodes */ copy_statvfs_info(sbp, mp); return 0; } /* ARGSUSED */ int filecore_sync(struct mount *mp, int waitfor, kauth_cred_t cred) { return (0); } /* * File handle to vnode * * Have to be really careful about stale file handles: * - check that the inode number is in range * - call iget() to get the locked inode * - check for an unallocated inode (i_mode == 0) * - check that the generation number matches */ struct ifid { ushort ifid_len; ushort ifid_pad; u_int32_t ifid_ino; }; /* ARGSUSED */ int filecore_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) { struct ifid ifh; struct vnode *nvp; struct filecore_node *ip; int error; if (fhp->fid_len != sizeof(struct ifid)) return EINVAL; memcpy(&ifh, fhp, sizeof(ifh)); if ((error = VFS_VGET(mp, ifh.ifid_ino, &nvp)) != 0) { *vpp = NULLVP; return (error); } ip = VTOI(nvp); if (filecore_staleinode(ip)) { vput(nvp); *vpp = NULLVP; return (ESTALE); } *vpp = nvp; return (0); } /* This looks complicated. Look at other vgets as well as the iso9660 one. * * The filecore inode number is made up of 1 byte directory entry index and * 3 bytes of the internal disc address of the directory. On a read-only * filesystem this is unique. For a read-write version we may not be able to * do vget, see msdosfs. */ int filecore_vget(struct mount *mp, ino_t ino, struct vnode **vpp) { int error; error = vcache_get(mp, &ino, sizeof(ino), vpp); if (error) return error; error = vn_lock(*vpp, LK_EXCLUSIVE); if (error) { vrele(*vpp); *vpp = NULL; return error; } return 0; } /* * Vnode pointer to File handle */ /* ARGSUSED */ int filecore_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size) { struct filecore_node *ip = VTOI(vp); struct ifid ifh; if (*fh_size < sizeof(struct ifid)) { *fh_size = sizeof(struct ifid); return E2BIG; } memset(&ifh, 0, sizeof(ifh)); ifh.ifid_len = sizeof(struct ifid); ifh.ifid_ino = ip->i_number; memcpy(fhp, &ifh, sizeof(ifh)); return 0; }