コード例 #1
0
ファイル: link.c プロジェクト: CesarBallardini/minix3
/*===========================================================================*
 *                              fs_rename                                    *
 *===========================================================================*/
PUBLIC int fs_rename()
{
    /* Perform the rename(name1, name2) system call. */
    struct puffs_node *old_dirp, *old_ip;      /* ptrs to old dir, file pnodes */
    struct puffs_node *new_dirp, *new_ip;      /* ptrs to new dir, file pnodes */
    struct puffs_kcn pkcnp_src;
    PUFFS_MAKECRED(pcr_src, &global_kcred);
    struct puffs_cn pcn_src = {&pkcnp_src, (struct puffs_cred *) __UNCONST(pcr_src), {0,0,0}};
    struct puffs_kcn pkcnp_dest;
    PUFFS_MAKECRED(pcr_dest, &global_kcred);
    struct puffs_cn pcn_targ = {&pkcnp_dest, (struct puffs_cred *) __UNCONST(pcr_dest), {0,0,0}};
    int r = OK;                           /* error flag; initially no error */
    int odir, ndir;                       /* TRUE iff {old|new} file is dir */
    int same_pdir;                        /* TRUE iff parent dirs are the same */
    phys_bytes len;
    time_t cur_time;

    if (global_pu->pu_ops.puffs_node_rename == NULL)
        return(EINVAL);

    /* Copy the last component of the old name */
    len = fs_m_in.REQ_REN_LEN_OLD; /* including trailing '\0' */
    if (len > NAME_MAX + 1)
        return(ENAMETOOLONG);

    r = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) fs_m_in.REQ_REN_GRANT_OLD,
                         (vir_bytes) 0, (vir_bytes) pcn_src.pcn_name, (size_t) len, D);
    if (r != OK) return(r);
    NUL(pcn_src.pcn_name, len, sizeof(pcn_src.pcn_name));
    pcn_src.pcn_namelen = len - 1;

    /* Copy the last component of the new name */
    len = fs_m_in.REQ_REN_LEN_NEW; /* including trailing '\0' */
    if (len > NAME_MAX + 1)
        return(ENAMETOOLONG);

    r = sys_safecopyfrom(VFS_PROC_NR, (cp_grant_id_t) fs_m_in.REQ_REN_GRANT_NEW,
                         (vir_bytes) 0, (vir_bytes) pcn_targ.pcn_name, (size_t) len, D);
    if (r != OK) return(r);
    NUL(pcn_targ.pcn_name, len, sizeof(pcn_targ.pcn_name));
    pcn_targ.pcn_namelen = len - 1;

    /* Get old dir pnode */
    if ((old_dirp = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.REQ_REN_OLD_DIR))
            == NULL)
        return(ENOENT);

    old_ip = advance(old_dirp, pcn_src.pcn_name, IGN_PERM);
    if (!old_ip) {
        return(ENOENT);
    }
    r = err_code;

    if (r == EENTERMOUNT || r == ELEAVEMOUNT) {
        old_ip = NULL;
        if (r == EENTERMOUNT) r = EXDEV;        /* should this fail at all? */
        else if (r == ELEAVEMOUNT) r = EINVAL;  /* rename on dot-dot */
    }

    /* Get new dir pnode */
    if ((new_dirp = puffs_pn_nodewalk(global_pu, 0, &fs_m_in.REQ_REN_NEW_DIR))
            == NULL) {
        r = ENOENT;
    } else {
        if (new_dirp->pn_va.va_nlink == NO_LINK) {
            /* Dir does not actually exist */
            return(ENOENT);
        }
    }

    /* not required to exist */
    new_ip = advance(new_dirp, pcn_targ.pcn_name, IGN_PERM);

    /* However, if the check failed because the file does exist, don't continue.
     * Note that ELEAVEMOUNT is covered by the dot-dot check later. */
    if (err_code == EENTERMOUNT) {
        new_ip = NULL;
        r = EBUSY;
    }

    if (old_ip != NULL) {
        /* TRUE iff dir */
        odir = ((old_ip->pn_va.va_mode & I_TYPE) == I_DIRECTORY);
    } else {
        odir = FALSE;
    }

    if (r != OK) return(r);

    /* Check for a variety of possible errors. */
    same_pdir = (old_dirp == new_dirp);

    /* The old or new name must not be . or .. */
    if (strcmp(pcn_src.pcn_name, ".") == 0 ||
            strcmp(pcn_src.pcn_name, "..") == 0 ||
            strcmp(pcn_targ.pcn_name, ".") == 0 ||
            strcmp(pcn_targ.pcn_name, "..") == 0) {
        r = EINVAL;
    }

    /* Some tests apply only if the new path exists. */
    if (new_ip == NULL) {
        if (odir && (new_dirp->pn_va.va_nlink >= SHRT_MAX ||
                     new_dirp->pn_va.va_nlink >= LINK_MAX) &&
                !same_pdir && r == OK) {
            r = EMLINK;
        }
    } else {
        if (old_ip == new_ip) r = SAME; /* old=new */

        /* dir ? */
        ndir = ((new_ip->pn_va.va_mode & I_TYPE) == I_DIRECTORY);
        if (odir == TRUE && ndir == FALSE) r = ENOTDIR;
        if (odir == FALSE && ndir == TRUE) r = EISDIR;
    }

    if (r == SAME) {
        r = OK;
        goto rename_out;
    }

    if (r != OK) return(r);

    /* If a process has another root directory than the system root, we might
     * "accidently" be moving it's working directory to a place where it's
     * root directory isn't a super directory of it anymore. This can make
     * the function chroot useless. If chroot will be used often we should
     * probably check for it here. */

    /* The rename will probably work. Only two things can go wrong now:
     * 1. being unable to remove the new file. (when new file already exists)
     * 2. being unable to make the new directory entry. (new file doesn't exists)
     *     [directory has to grow by one block and cannot because the disk
     *      is completely full].
     * 3. Something (doubtfully) else depending on the FS.
     */

    if (buildpath) {
        pcn_src.pcn_po_full = old_ip->pn_po;

        if (puffs_path_pcnbuild(global_pu, &pcn_targ, new_dirp) != 0)
            return(EINVAL);
    }

    r = global_pu->pu_ops.puffs_node_rename(global_pu, old_dirp, old_ip, &pcn_src,
                                            new_dirp, new_ip, &pcn_targ);
    if (r > 0) r = -r;

    if (buildpath) {
        if (r) {
            global_pu->pu_pathfree(global_pu, &pcn_targ.pcn_po_full);
        } else {
            struct puffs_pathinfo pi;
            struct puffs_pathobj po_old;

            /* handle this node */
            po_old = old_ip->pn_po;
            old_ip->pn_po = pcn_targ.pcn_po_full;

            if (old_ip->pn_va.va_type != VDIR) {
                global_pu->pu_pathfree(global_pu, &po_old);
                return(OK);
            }

            /* handle all child nodes for DIRs */
            pi.pi_old = &pcn_src.pcn_po_full;
            pi.pi_new = &pcn_targ.pcn_po_full;

            PU_LOCK();
            if (puffs_pn_nodewalk(global_pu, puffs_path_prefixadj, &pi)
                    != NULL) {
                /* Actually nomem */
                return(EINVAL);
            }
            PU_UNLOCK();
            global_pu->pu_pathfree(global_pu, &po_old);
        }
    }

rename_out:
    cur_time = clock_time();
    update_times(old_dirp, MTIME | CTIME, cur_time);
    update_times(new_dirp, MTIME | CTIME, cur_time);

    /* XXX see release_node comment in fs_unlink */
    if (new_ip && new_ip->pn_count == 0) {
        release_node(global_pu, new_ip);
    }

    return(r);
}
コード例 #2
0
static void
dispatch(struct puffs_cc *pcc)
{
	struct puffs_usermount *pu = pcc->pcc_pu;
	struct puffs_ops *pops = &pu->pu_ops;
	struct puffs_req *preq = puffs__framebuf_getdataptr(pcc->pcc_pb);
	void *auxbuf; /* help with typecasting */
	puffs_cookie_t opcookie;
	int error = 0, buildpath, pncookie;

	/* XXX: smaller hammer, please */
	if ((PUFFSOP_OPCLASS(preq->preq_opclass == PUFFSOP_VFS &&
	    preq->preq_optype == PUFFS_VFS_VPTOFH)) ||
	    (PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VN &&
	    (preq->preq_optype == PUFFS_VN_READDIR
	    || preq->preq_optype == PUFFS_VN_READ))) {
		if (puffs_framebuf_reserve_space(pcc->pcc_pb,
		    PUFFS_MSG_MAXSIZE) == -1)
			error = errno;
		preq = puffs__framebuf_getdataptr(pcc->pcc_pb);
	}

	auxbuf = preq;
	opcookie = preq->preq_cookie;

	assert((pcc->pcc_flags & PCC_DONE) == 0);

	buildpath = pu->pu_flags & PUFFS_FLAG_BUILDPATH;
	pncookie = pu->pu_flags & PUFFS_FLAG_PNCOOKIE;
	assert(!buildpath || pncookie);

	preq->preq_setbacks = 0;

	if (pu->pu_flags & PUFFS_FLAG_OPDUMP)
		puffsdump_req(preq);

	puffs__cc_setcaller(pcc, preq->preq_pid, preq->preq_lid);

	/* pre-operation */
	if (pu->pu_oppre)
		pu->pu_oppre(pu);

	if (error)
		goto out;

	/* Execute actual operation */
	if (PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VFS) {
		switch (preq->preq_optype) {
		case PUFFS_VFS_UNMOUNT:
		{
			struct puffs_vfsmsg_unmount *auxt = auxbuf;

			PU_SETSTATE(pu, PUFFS_STATE_UNMOUNTING);
			error = pops->puffs_fs_unmount(pu, auxt->pvfsr_flags);
			if (!error)
				PU_SETSTATE(pu, PUFFS_STATE_UNMOUNTED);
			else
				PU_SETSTATE(pu, PUFFS_STATE_RUNNING);
			break;
		}

		case PUFFS_VFS_STATVFS:
		{
			struct puffs_vfsmsg_statvfs *auxt = auxbuf;

			error = pops->puffs_fs_statvfs(pu, &auxt->pvfsr_sb);
			break;
		}

		case PUFFS_VFS_SYNC:
		{
			struct puffs_vfsmsg_sync *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvfsr_cred);

			error = pops->puffs_fs_sync(pu,
			    auxt->pvfsr_waitfor, pcr);
			break;
		}

		case PUFFS_VFS_FHTOVP:
		{
			struct puffs_vfsmsg_fhtonode *auxt = auxbuf;
			struct puffs_newinfo pni;

			pni.pni_cookie = &auxt->pvfsr_fhcookie;
			pni.pni_vtype = &auxt->pvfsr_vtype;
			pni.pni_size = &auxt->pvfsr_size;
			pni.pni_rdev = &auxt->pvfsr_rdev;
			pni.pni_va = NULL;
			pni.pni_va_ttl = NULL;
			pni.pni_cn_ttl = NULL;

			error = pops->puffs_fs_fhtonode(pu, auxt->pvfsr_data,
			    auxt->pvfsr_dsize, &pni);

			break;
		}

		case PUFFS_VFS_VPTOFH:
		{
			struct puffs_vfsmsg_nodetofh *auxt = auxbuf;

			error = pops->puffs_fs_nodetofh(pu,
			    auxt->pvfsr_fhcookie, auxt->pvfsr_data,
			    &auxt->pvfsr_dsize);

			break;
		}

		case PUFFS_VFS_EXTATTRCTL:
		{
			struct puffs_vfsmsg_extattrctl *auxt = auxbuf;
			const char *attrname;
			int flags;

			if (pops->puffs_fs_extattrctl == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			if (auxt->pvfsr_flags & PUFFS_EXTATTRCTL_HASATTRNAME)
				attrname = auxt->pvfsr_attrname;
			else
				attrname = NULL;

			flags = auxt->pvfsr_flags & PUFFS_EXTATTRCTL_HASNODE;
			error = pops->puffs_fs_extattrctl(pu, auxt->pvfsr_cmd,
			    opcookie, flags,
			    auxt->pvfsr_attrnamespace, attrname);
			break;
		}

		default:
			/*
			 * I guess the kernel sees this one coming
			 */
			error = EINVAL;
			break;
		}

	/* XXX: audit return values */
	/* XXX: sync with kernel */
	} else if (PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_VN) {
		switch (preq->preq_optype) {
		case PUFFS_VN_LOOKUP:
		{
			struct puffs_vnmsg_lookup *auxt = auxbuf;
			struct puffs_newinfo pni;
			struct puffs_cn pcn;
			struct puffs_node *pn = NULL;

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			PUFFS_KCREDTOCRED(pcn.pcn_cred, &auxt->pvnr_cn_cred);
			pni.pni_cookie = &auxt->pvnr_newnode;
			pni.pni_vtype = &auxt->pvnr_vtype;
			pni.pni_size = &auxt->pvnr_size;
			pni.pni_rdev = &auxt->pvnr_rdev;
			pni.pni_va = &auxt->pvnr_va;
			pni.pni_va_ttl = &auxt->pvnr_va_ttl;
			pni.pni_cn_ttl = &auxt->pvnr_cn_ttl;

			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			/* lookup *must* be present */
			error = pops->puffs_node_lookup(pu, opcookie,
			    &pni, &pcn);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu, &pcn.pcn_po_full);
				} else {
					/*
					 * did we get a new node or a
					 * recycled node?
					 */
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
					if (pn->pn_po.po_path == NULL)
						pn->pn_po = pcn.pcn_po_full;
					else
						pu->pu_pathfree(pu,
						    &pcn.pcn_po_full);
				}
			}

			if (pncookie && !error) {
				if (pn == NULL)
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
				pn->pn_nlookup++;
			}
			break;
		}

		case PUFFS_VN_CREATE:
		{
			struct puffs_vnmsg_create *auxt = auxbuf;
			struct puffs_newinfo pni;
			struct puffs_cn pcn;
			struct puffs_node *pn = NULL;

			if (pops->puffs_node_create == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			PUFFS_KCREDTOCRED(pcn.pcn_cred, &auxt->pvnr_cn_cred);

			memset(&pni, 0, sizeof(pni));
			pni.pni_cookie = &auxt->pvnr_newnode;
			pni.pni_va = &auxt->pvnr_va;
			pni.pni_va_ttl = &auxt->pvnr_va_ttl;
			pni.pni_cn_ttl = &auxt->pvnr_cn_ttl;

			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			error = pops->puffs_node_create(pu,
			    opcookie, &pni, &pcn, &auxt->pvnr_va);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu, &pcn.pcn_po_full);
				} else {
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
					pn->pn_po = pcn.pcn_po_full;
				}
			}

			if (pncookie && !error) {
				if (pn == NULL)
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
				pn->pn_nlookup++;
			}
			break;
		}

		case PUFFS_VN_MKNOD:
		{
			struct puffs_vnmsg_mknod *auxt = auxbuf;
			struct puffs_newinfo pni;
			struct puffs_cn pcn;
			struct puffs_node *pn = NULL;

			if (pops->puffs_node_mknod == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			PUFFS_KCREDTOCRED(pcn.pcn_cred, &auxt->pvnr_cn_cred);

			memset(&pni, 0, sizeof(pni));
			pni.pni_cookie = &auxt->pvnr_newnode;
			pni.pni_va = &auxt->pvnr_va;
			pni.pni_va_ttl = &auxt->pvnr_va_ttl;
			pni.pni_cn_ttl = &auxt->pvnr_cn_ttl;

			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			error = pops->puffs_node_mknod(pu,
			    opcookie, &pni, &pcn, &auxt->pvnr_va);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu, &pcn.pcn_po_full);
				} else {
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
					pn->pn_po = pcn.pcn_po_full;
				}
			}

			if (pncookie && !error) {
				if (pn == NULL)
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
				pn->pn_nlookup++;
			}
			break;
		}

		case PUFFS_VN_OPEN:
		{
			struct puffs_vnmsg_open *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (pops->puffs_node_open2 != NULL) {
				error = pops->puffs_node_open2(pu,
				    opcookie, auxt->pvnr_mode, pcr, 
				    &auxt->pvnr_oflags);

				break;
			}

			if (pops->puffs_node_open == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_open(pu,
			    opcookie, auxt->pvnr_mode, pcr);
			break;
		}

		case PUFFS_VN_CLOSE:
		{
			struct puffs_vnmsg_close *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (pops->puffs_node_close == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_close(pu,
			    opcookie, auxt->pvnr_fflag, pcr);
			break;
		}

		case PUFFS_VN_ACCESS:
		{
			struct puffs_vnmsg_access *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (pops->puffs_node_access == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_access(pu,
			    opcookie, auxt->pvnr_mode, pcr);
			break;
		}

		case PUFFS_VN_GETATTR:
		{
			struct puffs_vnmsg_getattr *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (PUFFS_USE_FS_TTL(pu)) {
				if (pops->puffs_node_getattr_ttl == NULL) {
					error = EOPNOTSUPP;
					break;
				}

				error = pops->puffs_node_getattr_ttl(pu,
				    opcookie, &auxt->pvnr_va, pcr,
				    &auxt->pvnr_va_ttl);
			} else {
				if (pops->puffs_node_getattr == NULL) {
					error = EOPNOTSUPP;
					break;
				}

				error = pops->puffs_node_getattr(pu,
				    opcookie, &auxt->pvnr_va, pcr);
			}
			break;
		}

		case PUFFS_VN_SETATTR:
		{
			struct puffs_vnmsg_setattr *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (PUFFS_USE_FS_TTL(pu)) {
				int xflag = 0;

				if (pops->puffs_node_setattr_ttl == NULL) {
					error = EOPNOTSUPP;
					break;
				}

				if (!PUFFSOP_WANTREPLY(preq->preq_opclass))
					xflag |= PUFFS_SETATTR_FAF;

				error = pops->puffs_node_setattr_ttl(pu,
				    opcookie, &auxt->pvnr_va, pcr,
				    &auxt->pvnr_va_ttl, xflag);
			} else {
				if (pops->puffs_node_setattr == NULL) {
					error = EOPNOTSUPP;
					break;
				}

				error = pops->puffs_node_setattr(pu,
				    opcookie, &auxt->pvnr_va, pcr);
			}
			break;
		}

		case PUFFS_VN_MMAP:
		{
			struct puffs_vnmsg_mmap *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (pops->puffs_node_mmap == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_mmap(pu,
			    opcookie, auxt->pvnr_prot, pcr);
			break;
		}

		case PUFFS_VN_FSYNC:
		{
			struct puffs_vnmsg_fsync *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (pops->puffs_node_fsync == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_fsync(pu, opcookie, pcr,
			    auxt->pvnr_flags, auxt->pvnr_offlo,
			    auxt->pvnr_offhi);
			break;
		}

		case PUFFS_VN_SEEK:
		{
			struct puffs_vnmsg_seek *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (pops->puffs_node_seek == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_seek(pu,
			    opcookie, auxt->pvnr_oldoff,
			    auxt->pvnr_newoff, pcr);
			break;
		}

		case PUFFS_VN_REMOVE:
		{
			struct puffs_vnmsg_remove *auxt = auxbuf;
			struct puffs_cn pcn;
			if (pops->puffs_node_remove == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			PUFFS_KCREDTOCRED(pcn.pcn_cred, &auxt->pvnr_cn_cred);

			error = pops->puffs_node_remove(pu,
			    opcookie, auxt->pvnr_cookie_targ, &pcn);
			break;
		}

		case PUFFS_VN_LINK:
		{
			struct puffs_vnmsg_link *auxt = auxbuf;
			struct puffs_cn pcn;
			if (pops->puffs_node_link == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			PUFFS_KCREDTOCRED(pcn.pcn_cred, &auxt->pvnr_cn_cred);

			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			error = pops->puffs_node_link(pu,
			    opcookie, auxt->pvnr_cookie_targ, &pcn);
			if (buildpath)
				pu->pu_pathfree(pu, &pcn.pcn_po_full);

			break;
		}

		case PUFFS_VN_RENAME:
		{
			struct puffs_vnmsg_rename *auxt = auxbuf;
			struct puffs_cn pcn_src, pcn_targ;
			struct puffs_node *pn_src;

			if (pops->puffs_node_rename == NULL) {
				error = 0;
				break;
			}

			pcn_src.pcn_pkcnp = &auxt->pvnr_cn_src;
			PUFFS_KCREDTOCRED(pcn_src.pcn_cred,
			    &auxt->pvnr_cn_src_cred);

			pcn_targ.pcn_pkcnp = &auxt->pvnr_cn_targ;
			PUFFS_KCREDTOCRED(pcn_targ.pcn_cred,
			    &auxt->pvnr_cn_targ_cred);

			if (buildpath) {
				pn_src = auxt->pvnr_cookie_src;
				pcn_src.pcn_po_full = pn_src->pn_po;

				error = puffs_path_pcnbuild(pu, &pcn_targ,
				    auxt->pvnr_cookie_targdir);
				if (error)
					break;
			}

			error = pops->puffs_node_rename(pu,
			    opcookie, auxt->pvnr_cookie_src,
			    &pcn_src, auxt->pvnr_cookie_targdir,
			    auxt->pvnr_cookie_targ, &pcn_targ);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu,
					    &pcn_targ.pcn_po_full);
				} else {
					struct puffs_pathinfo pi;
					struct puffs_pathobj po_old;

					/* handle this node */
					po_old = pn_src->pn_po;
					pn_src->pn_po = pcn_targ.pcn_po_full;

					if (pn_src->pn_va.va_type != VDIR) {
						pu->pu_pathfree(pu, &po_old);
						break;
					}

					/* handle all child nodes for DIRs */
					pi.pi_old = &pcn_src.pcn_po_full;
					pi.pi_new = &pcn_targ.pcn_po_full;

					PU_LOCK();
					if (puffs_pn_nodewalk(pu,
					    puffs_path_prefixadj, &pi) != NULL)
						error = ENOMEM;
					PU_UNLOCK();
					pu->pu_pathfree(pu, &po_old);
				}
			}
			break;
		}

		case PUFFS_VN_MKDIR:
		{
			struct puffs_vnmsg_mkdir *auxt = auxbuf;
			struct puffs_newinfo pni;
			struct puffs_cn pcn;
			struct puffs_node *pn = NULL;

			if (pops->puffs_node_mkdir == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			PUFFS_KCREDTOCRED(pcn.pcn_cred, &auxt->pvnr_cn_cred);

			memset(&pni, 0, sizeof(pni));
			pni.pni_cookie = &auxt->pvnr_newnode;
			pni.pni_va = &auxt->pvnr_va;
			pni.pni_va_ttl = &auxt->pvnr_va_ttl;
			pni.pni_cn_ttl = &auxt->pvnr_cn_ttl;

			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			error = pops->puffs_node_mkdir(pu,
			    opcookie, &pni, &pcn, &auxt->pvnr_va);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu, &pcn.pcn_po_full);
				} else {
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
					pn->pn_po = pcn.pcn_po_full;
				}
			}

			if (pncookie && !error) {
				if (pn == NULL)
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
				pn->pn_nlookup++;
			}
			break;
		}

		case PUFFS_VN_RMDIR:
		{
			struct puffs_vnmsg_rmdir *auxt = auxbuf;
			struct puffs_cn pcn;
			if (pops->puffs_node_rmdir == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			PUFFS_KCREDTOCRED(pcn.pcn_cred, &auxt->pvnr_cn_cred);

			error = pops->puffs_node_rmdir(pu,
			    opcookie, auxt->pvnr_cookie_targ, &pcn);
			break;
		}

		case PUFFS_VN_SYMLINK:
		{
			struct puffs_vnmsg_symlink *auxt = auxbuf;
			struct puffs_newinfo pni;
			struct puffs_cn pcn;
			struct puffs_node *pn = NULL;

			if (pops->puffs_node_symlink == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			PUFFS_KCREDTOCRED(pcn.pcn_cred, &auxt->pvnr_cn_cred);

			memset(&pni, 0, sizeof(pni));
			pni.pni_cookie = &auxt->pvnr_newnode;
			pni.pni_va = &auxt->pvnr_va;
			pni.pni_va_ttl = &auxt->pvnr_va_ttl;
			pni.pni_cn_ttl = &auxt->pvnr_cn_ttl;

			if (buildpath) {
				error = puffs_path_pcnbuild(pu, &pcn, opcookie);
				if (error)
					break;
			}

			error = pops->puffs_node_symlink(pu,
			    opcookie, &pni, &pcn,
			    &auxt->pvnr_va, auxt->pvnr_link);

			if (buildpath) {
				if (error) {
					pu->pu_pathfree(pu, &pcn.pcn_po_full);
				} else {
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
					pn->pn_po = pcn.pcn_po_full;
				}
			}

			if (pncookie && !error) {
				if (pn == NULL)
					pn = PU_CMAP(pu, auxt->pvnr_newnode);
				pn->pn_nlookup++;
			}
			break;
		}

		case PUFFS_VN_READDIR:
		{
			struct puffs_vnmsg_readdir *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);
			struct dirent *dent;
			off_t *cookies;
			size_t res, origcookies;

			if (pops->puffs_node_readdir == NULL) {
				error = 0;
				break;
			}

			if (auxt->pvnr_ncookies) {
				/* LINTED: pvnr_data is __aligned() */
				cookies = (off_t *)auxt->pvnr_data;
				origcookies = auxt->pvnr_ncookies;
			} else {
				cookies = NULL;
				origcookies = 0;
			}
			/* LINTED: dentoff is aligned in the kernel */
			dent = (struct dirent *)
			    (auxt->pvnr_data + auxt->pvnr_dentoff);

			res = auxt->pvnr_resid;
			error = pops->puffs_node_readdir(pu,
			    opcookie, dent, &auxt->pvnr_offset,
			    &auxt->pvnr_resid, pcr, &auxt->pvnr_eofflag,
			    cookies, &auxt->pvnr_ncookies);

			/* much easier to track non-working NFS */
			assert(auxt->pvnr_ncookies <= origcookies);

			/* need to move a bit more */
			preq->preq_buflen = sizeof(struct puffs_vnmsg_readdir) 
			    + auxt->pvnr_dentoff + (res - auxt->pvnr_resid);
			break;
		}

		case PUFFS_VN_READLINK:
		{
			struct puffs_vnmsg_readlink *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (pops->puffs_node_readlink == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			/*LINTED*/
			error = pops->puffs_node_readlink(pu, opcookie, pcr,
			    auxt->pvnr_link, &auxt->pvnr_linklen);
			break;
		}

		case PUFFS_VN_RECLAIM:
		{
			struct puffs_vnmsg_reclaim *auxt = auxbuf;
			struct puffs_node *pn;
		
			if (pops->puffs_node_reclaim2 != NULL) {
				error = pops->puffs_node_reclaim2(pu, opcookie,
					     auxt->pvnr_nlookup);
				break;
			}

			if (pops->puffs_node_reclaim == NULL) {
				error = 0;
				break;
			}

			/*
			 * This fixes a race condition, 
			 * where a node in reclaimed by kernel 
			 * after a lookup request is sent, 
			 * but before the reply, leaving the kernel
			 * with a invalid vnode/cookie reference.
			 */
			if (pncookie) {
				pn = PU_CMAP(pu, opcookie);
				pn->pn_nlookup -= auxt->pvnr_nlookup;
				if (pn->pn_nlookup >= 1) {
					error = 0;
					break;
				}
			}

			error = pops->puffs_node_reclaim(pu, opcookie);
			break;
		}

		case PUFFS_VN_INACTIVE:
		{

			if (pops->puffs_node_inactive == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			error = pops->puffs_node_inactive(pu, opcookie);
			break;
		}

		case PUFFS_VN_PATHCONF:
		{
			struct puffs_vnmsg_pathconf *auxt = auxbuf;
			if (pops->puffs_node_pathconf == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_pathconf(pu,
			    opcookie, auxt->pvnr_name,
			    &auxt->pvnr_retval);
			break;
		}

		case PUFFS_VN_ADVLOCK:
		{
			struct puffs_vnmsg_advlock *auxt = auxbuf;
			if (pops->puffs_node_advlock == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_advlock(pu,
			    opcookie, auxt->pvnr_id, auxt->pvnr_op,
			    &auxt->pvnr_fl, auxt->pvnr_flags);
			break;
		}

		case PUFFS_VN_PRINT:
		{
			if (pops->puffs_node_print == NULL) {
				error = 0;
				break;
			}

			error = pops->puffs_node_print(pu,
			    opcookie);
			break;
		}

		case PUFFS_VN_ABORTOP:
		{
			struct puffs_vnmsg_abortop *auxt = auxbuf;
			struct puffs_cn pcn;

			if (pops->puffs_node_abortop == NULL) {
				error = 0;
				break;
			}

			pcn.pcn_pkcnp = &auxt->pvnr_cn;
			PUFFS_KCREDTOCRED(pcn.pcn_cred, &auxt->pvnr_cn_cred);

			error = pops->puffs_node_abortop(pu, opcookie, &pcn);
				
			break;
		}

		case PUFFS_VN_READ:
		{
			struct puffs_vnmsg_read *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);
			size_t res;

			if (pops->puffs_node_read == NULL) {
				error = EIO;
				break;
			}

			res = auxt->pvnr_resid;
			error = pops->puffs_node_read(pu,
			    opcookie, auxt->pvnr_data,
			    auxt->pvnr_offset, &auxt->pvnr_resid,
			    pcr, auxt->pvnr_ioflag);

			/* need to move a bit more */
			preq->preq_buflen = sizeof(struct puffs_vnmsg_read)
			    + (res - auxt->pvnr_resid);
			break;
		}

		case PUFFS_VN_WRITE:
		{
			struct puffs_vnmsg_write *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (pops->puffs_node_write2 != NULL) {
				int xflag = 0;

				if (!PUFFSOP_WANTREPLY(preq->preq_opclass))
					xflag |= PUFFS_SETATTR_FAF;

				error = pops->puffs_node_write2(pu,
				    opcookie, auxt->pvnr_data,
				    auxt->pvnr_offset, &auxt->pvnr_resid,
				    pcr, auxt->pvnr_ioflag, xflag);

			} else if (pops->puffs_node_write != NULL) {
				error = pops->puffs_node_write(pu,
				    opcookie, auxt->pvnr_data,
				    auxt->pvnr_offset, &auxt->pvnr_resid,
				    pcr, auxt->pvnr_ioflag);
			} else {
				error = EIO;
				break;
			}


			/* don't need to move data back to the kernel */
			preq->preq_buflen = sizeof(struct puffs_vnmsg_write);
			break;
		}

		case PUFFS_VN_POLL:
		{
			struct puffs_vnmsg_poll *auxt = auxbuf;

			if (pops->puffs_node_poll == NULL) {
				error = 0;

				/* emulate genfs_poll() */
				auxt->pvnr_events &= (POLLIN | POLLOUT
						    | POLLRDNORM | POLLWRNORM);

				break;
			}

			error = pops->puffs_node_poll(pu,
			    opcookie, &auxt->pvnr_events);
			break;
		}

		case PUFFS_VN_GETEXTATTR:
		{
			struct puffs_vnmsg_getextattr *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);
			size_t res, *resp, *sizep;
			uint8_t *data;

			if (pops->puffs_node_getextattr == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			if (auxt->pvnr_datasize)
				sizep = &auxt->pvnr_datasize;
			else
				sizep = NULL;

			res = auxt->pvnr_resid;
			if (res > 0) {
				data = auxt->pvnr_data;
				resp = &auxt->pvnr_resid;
			} else {
				data = NULL;
				resp = NULL;
			}

			error = pops->puffs_node_getextattr(pu,
			    opcookie, auxt->pvnr_attrnamespace,
			    auxt->pvnr_attrname, sizep, data, resp, pcr);

			/* need to move a bit more? */
			preq->preq_buflen =
			    sizeof(struct puffs_vnmsg_getextattr)
			    + (res - auxt->pvnr_resid);
			break;
		}

		case PUFFS_VN_SETEXTATTR:
		{
			struct puffs_vnmsg_setextattr *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);
			size_t *resp;
			uint8_t *data;

			if (pops->puffs_node_setextattr == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			if (auxt->pvnr_resid > 0) {
				data = auxt->pvnr_data;
				resp = &auxt->pvnr_resid;
			} else {
				data = NULL;
				resp = NULL;
			}

			error = pops->puffs_node_setextattr(pu,
			    opcookie, auxt->pvnr_attrnamespace,
			    auxt->pvnr_attrname, data, resp, pcr);
			break;
		}

		case PUFFS_VN_LISTEXTATTR:
		{
			struct puffs_vnmsg_listextattr *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);
			size_t res, *resp, *sizep;
			int flag;
			uint8_t *data;

			if (pops->puffs_node_listextattr == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			if (auxt->pvnr_datasize)
				sizep = &auxt->pvnr_datasize;
			else
				sizep = NULL;

			res = auxt->pvnr_resid;
			if (res > 0) {
				data = auxt->pvnr_data;
				resp = &auxt->pvnr_resid;
			} else {
				data = NULL;
				resp = NULL;
			}

			res = auxt->pvnr_resid;
			flag = auxt->pvnr_flag;
			error = pops->puffs_node_listextattr(pu,
			    opcookie, auxt->pvnr_attrnamespace,
			    sizep, data, resp, flag, pcr);

			/* need to move a bit more? */
			preq->preq_buflen =
			    sizeof(struct puffs_vnmsg_listextattr)
			    + (res - auxt->pvnr_resid);
			break;
		}

		case PUFFS_VN_DELETEEXTATTR:
		{
			struct puffs_vnmsg_deleteextattr *auxt = auxbuf;
			PUFFS_MAKECRED(pcr, &auxt->pvnr_cred);

			if (pops->puffs_node_deleteextattr == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			error = pops->puffs_node_deleteextattr(pu,
			    opcookie, auxt->pvnr_attrnamespace,
			    auxt->pvnr_attrname, pcr);
			break;
		}

		case PUFFS_VN_FALLOCATE:
		{
			struct puffs_vnmsg_fallocate *auxt = auxbuf;

			if (pops->puffs_node_fallocate == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			error = pops->puffs_node_fallocate(pu,
			    opcookie, auxt->pvnr_off, auxt->pvnr_len);
			break;
		}

		case PUFFS_VN_FDISCARD:
		{
			struct puffs_vnmsg_fdiscard *auxt = auxbuf;

			if (pops->puffs_node_fdiscard == NULL) {
				error = EOPNOTSUPP;
				break;
			}

			error = pops->puffs_node_fdiscard(pu,
			    opcookie, auxt->pvnr_off, auxt->pvnr_len);
			break;
		}

		default:
			printf("inval op %d\n", preq->preq_optype);
			error = EINVAL;
			break;
		}

#if 0
	/* not issued by kernel currently */
	} else if (PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_CACHE) {
		struct puffs_cacheinfo *pci = (void *)preq;

		if (pu->pu_ops.puffs_cache_write) {
			pu->pu_ops.puffs_cache_write(pu, preq->preq_cookie,
			    pci->pcache_nruns, pci->pcache_runs);
		}
		error = 0;
#endif

	} else if (PUFFSOP_OPCLASS(preq->preq_opclass) == PUFFSOP_ERROR) {
		struct puffs_error *perr = (void *)preq;

		pu->pu_errnotify(pu, preq->preq_optype,
		    perr->perr_error, perr->perr_str, preq->preq_cookie);
		error = 0;
	} else {
		/*
		 * I guess the kernel sees this one coming also
		 */
		error = EINVAL;
	}

 out:
	preq->preq_rv = error;

	if (pu->pu_oppost)
		pu->pu_oppost(pu);

	pcc->pcc_flags |= PCC_DONE;
}
コード例 #3
0
ファイル: opdump.c プロジェクト: glk/puffs
void
puffsdump_req(struct puffs_req *preq)
{
	static struct timeval tv_prev;
	struct timeval tv_now, tv;
	const char **map;
	int isvn = 0;

	map = NULL; /* yes, we are all interested in your opinion, gcc */
	switch (PUFFSOP_OPCLASS(preq->preq_opclass)) {
	case PUFFSOP_VFS:
		map = vfsop_revmap;
		break;
	case PUFFSOP_VN:
		map = vnop_revmap;
		isvn = 1;
		break;
	case PUFFSOP_CACHE:
		map = cacheop_revmap;
		break;
	case PUFFSOP_ERROR:
		map = errnot_revmap;
		break;
	case PUFFSOP_FLUSH:
		map = flush_revmap;
		break;
	}

	printf("\treqid: %" PRIu64 ", opclass %d%s, optype: %s, "
	    "cookie: %p,\n\t\taux: %p, auxlen: %zu, pid: %d, lwpid: %d\n",
	    preq->preq_id, PUFFSOP_OPCLASS(preq->preq_opclass),
	    PUFFSOP_WANTREPLY(preq->preq_opclass) ? "" : " (FAF)",
	    map[preq->preq_optype], preq->preq_cookie,
	    preq->preq_buf, preq->preq_buflen,
	    preq->preq_pid, preq->preq_lid);

	if (isvn) {
		switch (preq->preq_optype) {
		case PUFFS_VN_LOOKUP:
			puffsdump_lookup(preq);
			break;
		case PUFFS_VN_READ:
		case PUFFS_VN_WRITE:
			puffsdump_readwrite(preq);
			break;
		case PUFFS_VN_OPEN:
			puffsdump_open(preq);
			break;
		case PUFFS_VN_REMOVE:
		case PUFFS_VN_RMDIR:
		case PUFFS_VN_LINK:
			puffsdump_targ(preq);
			break;
		case PUFFS_VN_READDIR:
			puffsdump_readdir(preq);
			break;
		default:
			break;
		}
	}
	
	PU_LOCK();
	gettimeofday(&tv_now, NULL);
	timersub(&tv_now, &tv_prev, &tv);
	printf("\t\tsince previous call: %lld.%06ld\n",
	    (long long)tv.tv_sec, (long)tv.tv_usec);
	gettimeofday(&tv_prev, NULL);
	PU_UNLOCK();
}