/* $NetBSD: filecore_vnops.c,v 1.44 2015/04/20 23:03:08 riastradh 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_vnops.c 1.2 1998/8/18 */ /*- * 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_vnops.c 1.2 1998/8/18 */ #include __KERNEL_RCSID(0, "$NetBSD: filecore_vnops.c,v 1.44 2015/04/20 23:03:08 riastradh Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static int filecore_check_possible(struct vnode *vp, struct filecore_node *ip, mode_t mode) { /* * Disallow write attempts unless the file is a socket, * fifo, or a block or character device resident on the * file system. */ if (mode & VWRITE) { switch (vp->v_type) { case VDIR: case VLNK: case VREG: return (EROFS); default: break; } } return 0; } /* * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC. * The mode is shifted to select the owner/group/other fields. The * super user is granted all permissions. */ static int filecore_check_permitted(struct vnode *vp, struct filecore_node *ip, mode_t mode, kauth_cred_t cred) { struct filecore_mnt *fcmp = ip->i_mnt; return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(mode, vp->v_type, filecore_mode(ip)), vp, NULL, genfs_can_access(vp->v_type, filecore_mode(ip), fcmp->fc_uid, fcmp->fc_gid, mode, cred)); } int filecore_access(void *v) { struct vop_access_args /* { struct vnode *a_vp; int a_mode; kauth_cred_t a_cred; } */ *ap = v; struct vnode *vp = ap->a_vp; struct filecore_node *ip = VTOI(vp); int error; error = filecore_check_possible(vp, ip, ap->a_mode); if (error) return error; error = filecore_check_permitted(vp, ip, ap->a_mode, ap->a_cred); return error; } int filecore_getattr(void *v) { struct vop_getattr_args /* { struct vnode *a_vp; struct vattr *a_vap; kauth_cred_t a_cred; } */ *ap = v; struct vnode *vp = ap->a_vp; struct filecore_node *ip = VTOI(vp); struct vattr *vap = ap->a_vap; struct filecore_mnt *fcmp = ip->i_mnt; vap->va_fsid = ip->i_dev; vap->va_fileid = ip->i_number; vap->va_mode = filecore_mode(ip); vap->va_nlink = 1; vap->va_uid = fcmp->fc_uid; vap->va_gid = fcmp->fc_gid; vap->va_atime = filecore_time(ip); vap->va_mtime = filecore_time(ip); vap->va_ctime = filecore_time(ip); vap->va_rdev = 0; /* We don't support specials */ vap->va_size = (u_quad_t) ip->i_size; vap->va_flags = 0; vap->va_gen = 1; vap->va_blocksize = fcmp->blksize; vap->va_bytes = vap->va_size; vap->va_type = vp->v_type; return (0); } /* * Vnode op for reading. */ int filecore_read(void *v) { struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; kauth_cred_t a_cred; } */ *ap = v; struct vnode *vp = ap->a_vp; struct uio *uio = ap->a_uio; struct filecore_node *ip = VTOI(vp); struct filecore_mnt *fcmp; struct buf *bp; daddr_t lbn; off_t diff; int error = 0; long size, n, on; if (uio->uio_resid == 0) return (0); if (uio->uio_offset < 0) return (EINVAL); if (uio->uio_offset >= ip->i_size) return (0); ip->i_flag |= IN_ACCESS; fcmp = ip->i_mnt; if (vp->v_type == VREG) { const int advice = IO_ADV_DECODE(ap->a_ioflag); error = 0; while (uio->uio_resid > 0) { vsize_t bytelen = MIN(ip->i_size - uio->uio_offset, uio->uio_resid); if (bytelen == 0) { break; } error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice, UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp)); if (error) { break; } } goto out; } do { lbn = filecore_lblkno(fcmp, uio->uio_offset); on = filecore_blkoff(fcmp, uio->uio_offset); n = MIN(filecore_blksize(fcmp, ip, lbn) - on, uio->uio_resid); diff = (off_t)ip->i_size - uio->uio_offset; if (diff <= 0) return (0); if (diff < n) n = diff; size = filecore_blksize(fcmp, ip, lbn); if (ip->i_dirent.attr & FILECORE_ATTR_DIR) { error = filecore_dbread(ip, &bp); on = uio->uio_offset; n = MIN(FILECORE_DIR_SIZE - on, uio->uio_resid); size = FILECORE_DIR_SIZE; } else { error = bread(vp, lbn, size, 0, &bp); #ifdef FILECORE_DEBUG_BR printf("bread(%p, %llx, %ld, CRED, %p)=%d\n", vp, (long long)lbn, size, bp, error); #endif } if (error) { return (error); } n = MIN(n, size - bp->b_resid); error = uiomove((char *)(bp->b_data) + on, (int)n, uio); #ifdef FILECORE_DEBUG_BR printf("brelse(%p) vn2\n", bp); #endif brelse(bp, 0); } while (error == 0 && uio->uio_resid > 0 && n != 0); out: return (error); } /* * Vnode op for readdir */ int filecore_readdir(void *v) { struct vop_readdir_args /* { struct vnode *a_vp; struct uio *a_uio; kauth_cred_t a_cred; int *a_eofflag; off_t **a_cookies; int *a_ncookies; } */ *ap = v; struct uio *uio = ap->a_uio; struct vnode *vdp = ap->a_vp; struct filecore_node *dp; struct buf *bp = NULL; struct dirent *de; struct filecore_direntry *dep = NULL; int error = 0; off_t *cookies = NULL; int ncookies = 0; int i; off_t uiooff; dp = VTOI(vdp); if ((dp->i_dirent.attr & FILECORE_ATTR_DIR) == 0) return (ENOTDIR); if (uio->uio_offset % FILECORE_DIRENT_SIZE != 0) return (EINVAL); i = uio->uio_offset / FILECORE_DIRENT_SIZE; uiooff = uio->uio_offset; *ap->a_eofflag = 0; error = filecore_dbread(dp, &bp); if (error) { return error; } if (ap->a_ncookies == NULL) cookies = NULL; else { *ap->a_ncookies = 0; ncookies = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0); cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); } de = kmem_zalloc(sizeof(struct dirent), KM_SLEEP); for (; ; i++) { switch (i) { case 0: /* Fake the '.' entry */ de->d_fileno = dp->i_number; de->d_type = DT_DIR; de->d_namlen = 1; strlcpy(de->d_name, ".", sizeof(de->d_name)); break; case 1: /* Fake the '..' entry */ de->d_fileno = filecore_getparent(dp); de->d_type = DT_DIR; de->d_namlen = 2; strlcpy(de->d_name, "..", sizeof(de->d_name)); break; default: de->d_fileno = dp->i_dirent.addr + ((i - 2) << FILECORE_INO_INDEX); dep = fcdirentry(bp->b_data, i - 2); if (dep->attr & FILECORE_ATTR_DIR) de->d_type = DT_DIR; else de->d_type = DT_REG; if (filecore_fn2unix(dep->name, de->d_name, /*###346 [cc] warning: passing arg 3 of `filecore_fn2unix' from incompatible pointer type%%%*/ &de->d_namlen)) { *ap->a_eofflag = 1; goto out; } break; } de->d_reclen = _DIRENT_SIZE(de); if (uio->uio_resid < de->d_reclen) goto out; error = uiomove(de, de->d_reclen, uio); if (error) goto out; uiooff += FILECORE_DIRENT_SIZE; if (cookies) { *cookies++ = i*FILECORE_DIRENT_SIZE; (*ap->a_ncookies)++; if (--ncookies == 0) goto out; } } out: if (cookies) { *ap->a_cookies = cookies; if (error) { free(cookies, M_TEMP); *ap->a_ncookies = 0; *ap->a_cookies = NULL; } } uio->uio_offset = uiooff; #ifdef FILECORE_DEBUG_BR printf("brelse(%p) vn3\n", bp); #endif brelse (bp, 0); kmem_free(de, sizeof(*de)); return (error); } /* * Return target name of a symbolic link * Shouldn't we get the parent vnode and read the data from there? * This could eventually result in deadlocks in filecore_lookup. * But otherwise the block read here is in the block buffer two times. */ int filecore_readlink(void *v) { #if 0 struct vop_readlink_args /* { struct vnode *a_vp; struct uio *a_uio; kauth_cred_t a_cred; } */ *ap = v; #endif return (EINVAL); } int filecore_link(void *v) { struct vop_link_v2_args /* { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); return (EROFS); } int filecore_symlink(void *v) { struct vop_symlink_v3_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; char *a_target; } */ *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); return (EROFS); } /* * Calculate the logical to physical mapping if not done already, * then call the device strategy routine. */ int filecore_strategy(void *v) { struct vop_strategy_args /* { struct vnode *a_vp; struct buf *a_bp; } */ *ap = v; struct buf *bp = ap->a_bp; struct vnode *vp = ap->a_vp; struct filecore_node *ip; int error; ip = VTOI(vp); if (bp->b_blkno == bp->b_lblkno) { error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL); if (error) { bp->b_error = error; biodone(bp); return (error); } if ((long)bp->b_blkno == -1) clrbuf(bp); } if ((long)bp->b_blkno == -1) { biodone(bp); return (0); } vp = ip->i_devvp; return (VOP_STRATEGY(vp, bp)); } /* * Print out the contents of an inode. */ /*ARGSUSED*/ int filecore_print(void *v) { printf("tag VT_FILECORE, filecore vnode\n"); return (0); } /* * Return POSIX pathconf information applicable to filecore filesystems. */ int filecore_pathconf(void *v) { struct vop_pathconf_args /* { struct vnode *a_vp; int a_name; register_t *a_retval; } */ *ap = v; switch (ap->a_name) { case _PC_LINK_MAX: *ap->a_retval = 1; return (0); case _PC_NAME_MAX: *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_namemax; return (0); case _PC_PATH_MAX: *ap->a_retval = 256; return (0); case _PC_CHOWN_RESTRICTED: *ap->a_retval = 1; return (0); case _PC_NO_TRUNC: *ap->a_retval = 1; return (0); case _PC_SYNC_IO: *ap->a_retval = 1; return (0); case _PC_FILESIZEBITS: *ap->a_retval = 32; return (0); default: return (EINVAL); } /* NOTREACHED */ } /* * Global vfs data structures for isofs */ #define filecore_create genfs_eopnotsupp #define filecore_mknod genfs_eopnotsupp #define filecore_write genfs_eopnotsupp #define filecore_setattr genfs_eopnotsupp #define filecore_fcntl genfs_fcntl #define filecore_ioctl genfs_enoioctl #define filecore_fsync genfs_nullop #define filecore_remove genfs_eopnotsupp #define filecore_rename genfs_eopnotsupp #define filecore_mkdir genfs_eopnotsupp #define filecore_rmdir genfs_eopnotsupp #define filecore_advlock genfs_eopnotsupp #define filecore_bwrite genfs_eopnotsupp #define filecore_revoke genfs_revoke /* * Global vfs data structures for filecore */ int (**filecore_vnodeop_p)(void *); const struct vnodeopv_entry_desc filecore_vnodeop_entries[] = { { &vop_default_desc, vn_default_error }, { &vop_lookup_desc, filecore_lookup }, /* lookup */ { &vop_create_desc, filecore_create }, /* create */ { &vop_mknod_desc, filecore_mknod }, /* mknod */ { &vop_open_desc, filecore_open }, /* open */ { &vop_close_desc, filecore_close }, /* close */ { &vop_access_desc, filecore_access }, /* access */ { &vop_getattr_desc, filecore_getattr }, /* getattr */ { &vop_setattr_desc, filecore_setattr }, /* setattr */ { &vop_read_desc, filecore_read }, /* read */ { &vop_write_desc, filecore_write }, /* write */ { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ { &vop_fcntl_desc, filecore_fcntl }, /* fcntl */ { &vop_ioctl_desc, filecore_ioctl }, /* ioctl */ { &vop_poll_desc, filecore_poll }, /* poll */ { &vop_kqfilter_desc, genfs_kqfilter }, /* kqfilter */ { &vop_revoke_desc, filecore_revoke }, /* revoke */ { &vop_mmap_desc, filecore_mmap }, /* mmap */ { &vop_fsync_desc, filecore_fsync }, /* fsync */ { &vop_seek_desc, filecore_seek }, /* seek */ { &vop_remove_desc, filecore_remove }, /* remove */ { &vop_link_desc, filecore_link }, /* link */ { &vop_rename_desc, filecore_rename }, /* rename */ { &vop_mkdir_desc, filecore_mkdir }, /* mkdir */ { &vop_rmdir_desc, filecore_rmdir }, /* rmdir */ { &vop_symlink_desc, filecore_symlink }, /* symlink */ { &vop_readdir_desc, filecore_readdir }, /* readdir */ { &vop_readlink_desc, filecore_readlink }, /* readlink */ { &vop_abortop_desc, filecore_abortop }, /* abortop */ { &vop_inactive_desc, filecore_inactive }, /* inactive */ { &vop_reclaim_desc, filecore_reclaim }, /* reclaim */ { &vop_lock_desc, genfs_lock }, /* lock */ { &vop_unlock_desc, genfs_unlock }, /* unlock */ { &vop_bmap_desc, filecore_bmap }, /* bmap */ { &vop_strategy_desc, filecore_strategy }, /* strategy */ { &vop_print_desc, filecore_print }, /* print */ { &vop_islocked_desc, genfs_islocked }, /* islocked */ { &vop_pathconf_desc, filecore_pathconf }, /* pathconf */ { &vop_advlock_desc, filecore_advlock }, /* advlock */ { &vop_bwrite_desc, vn_bwrite }, /* bwrite */ { &vop_getpages_desc, genfs_getpages }, /* getpages */ { &vop_putpages_desc, genfs_putpages }, /* putpages */ { NULL, NULL } }; const struct vnodeopv_desc filecore_vnodeop_opv_desc = { &filecore_vnodeop_p, filecore_vnodeop_entries };