diff options
Diffstat (limited to 'sys/nfs/nfs_lock.c')
| -rw-r--r-- | sys/nfs/nfs_lock.c | 286 |
1 files changed, 0 insertions, 286 deletions
diff --git a/sys/nfs/nfs_lock.c b/sys/nfs/nfs_lock.c deleted file mode 100644 index b97b3b8213e6..000000000000 --- a/sys/nfs/nfs_lock.c +++ /dev/null @@ -1,286 +0,0 @@ -/*- - * Copyright (c) 1997 Berkeley Software Design, Inc. 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. Berkeley Software Design Inc's name may not be used to endorse or - * promote products derived from this software without specific prior - * written permission. - * - * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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. - * - * from BSDI nfs_lock.c,v 2.4 1998/12/14 23:49:56 jch Exp - * $FreeBSD$ - */ - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/fcntl.h> -#include <sys/kernel.h> /* for hz */ -#include <sys/lock.h> -#include <sys/malloc.h> -#include <sys/lockf.h> /* for hz */ /* Must come after sys/malloc.h */ -#include <sys/mbuf.h> -#include <sys/mount.h> -#include <sys/namei.h> -#include <sys/proc.h> -#include <sys/resourcevar.h> -#include <sys/socket.h> -#include <sys/socket.h> -#include <sys/unistd.h> -#include <sys/vnode.h> - -#include <machine/limits.h> - -#include <net/if.h> - -#include <nfs/rpcv2.h> -#include <nfs/nfsproto.h> -#include <nfs/nfs.h> -#include <nfs/nfsmount.h> -#include <nfs/nfsnode.h> -#include <nfs/nfs_lock.h> -#include <nfs/nlminfo.h> - -#define NFSOWNER_1ST_LEVEL_START 1 /* initial entries */ -#define NFSOWNER_2ND_LEVEL 256 /* some power of 2 */ - -#define NFSOWNER(tbl, i) \ - (tbl)[(i) / NFSOWNER_2ND_LEVEL][(i) % NFSOWNER_2ND_LEVEL] - -/* - * XXX - * We have to let the process know if the call succeeded. I'm using an extra - * field in the p_nlminfo field in the proc structure, as it is already for - * lockd stuff. - */ - -/* - * nfs_advlock -- - * NFS advisory byte-level locks. - */ -int -nfs_dolock(ap) - struct vop_advlock_args /* { - struct vnode *a_vp; - caddr_t a_id; - int a_op; - struct flock *a_fl; - int a_flags; - } */ *ap; -{ - LOCKD_MSG msg; - struct nameidata nd; - struct thread *td; - uid_t saved_uid; - struct vnode *vp, *wvp; - int error, error1; - struct flock *fl; - int fmode, ioflg; - struct proc *p; - - td = curthread; - p = td->td_proc; - - vp = ap->a_vp; - fl = ap->a_fl; - - /* - * the NLM protocol doesn't allow the server to return an error - * on ranges, so we do it. - */ - if (fl->l_whence != SEEK_END) { - if ((fl->l_whence != SEEK_CUR && fl->l_whence != SEEK_SET) || - fl->l_start < 0 || - (fl->l_len < 0 && - (fl->l_start == 0 || fl->l_start + fl->l_len < 0))) - return (EINVAL); - if (fl->l_len > 0 && - (fl->l_len - 1 > OFF_MAX - fl->l_start)) - return (EOVERFLOW); - } - - /* - * Fill in the information structure. - */ - msg.lm_version = LOCKD_MSG_VERSION; - msg.lm_msg_ident.pid = p->p_pid; - /* - * if there is no nfsowner table yet, allocate one. - */ - if (p->p_nlminfo == NULL) { - MALLOC(p->p_nlminfo, struct nlminfo *, - sizeof(struct nlminfo), M_LOCKF, M_WAITOK | M_ZERO); - p->p_nlminfo->pid_start = p->p_stats->p_start; - } - msg.lm_msg_ident.pid_start = p->p_nlminfo->pid_start; - msg.lm_msg_ident.msg_seq = ++(p->p_nlminfo->msg_seq); - - msg.lm_fl = *fl; - msg.lm_wait = ap->a_flags & F_WAIT; - msg.lm_getlk = ap->a_op == F_GETLK; - /* - * XXX -- I think this is wrong for anything other AF_INET. - */ - msg.lm_addr = *(VFSTONFS(vp->v_mount)->nm_nam); - msg.lm_fh_len = NFS_ISV3(vp) ? VTONFS(vp)->n_fhsize : NFSX_V2FH; - bcopy(VTONFS(vp)->n_fhp, msg.lm_fh, msg.lm_fh_len); - msg.lm_nfsv3 = NFS_ISV3(vp); - msg.lm_cred = *(p->p_ucred); - - /* - * Open the lock fifo. If for any reason we don't find the fifo, it - * means that the lock daemon isn't running. Translate any missing - * file error message for the user, otherwise the application will - * complain that the user's file is missing, which isn't the case. - * Note that we use proc0's cred, so the fifo is opened as root. - */ - NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, _PATH_LCKFIFO, td); - - /* - * XXX Hack to temporarily allow this process (regardless of it's creds) - * to open the fifo we need to write to. vn_open() really should - * take a ucred (and once it does, this code should be fixed to use - * proc0's ucred. - */ - saved_uid = p->p_ucred->cr_uid; - p->p_ucred->cr_uid = 0; /* temporarly run the vn_open as root */ - - fmode = FFLAGS(O_WRONLY); - error = vn_open(&nd, &fmode, 0); - p->p_ucred->cr_uid = saved_uid; - if (error != 0) { - return (error == ENOENT ? EOPNOTSUPP : error); - } - wvp = nd.ni_vp; - VOP_UNLOCK(wvp, 0, td); /* vn_open leaves it locked */ - - - ioflg = IO_UNIT; - for (;;) { - VOP_LEASE(wvp, td, proc0.p_ucred, LEASE_WRITE); - - error = vn_rdwr(UIO_WRITE, wvp, (caddr_t)&msg, sizeof(msg), 0, - UIO_SYSSPACE, ioflg, proc0.p_ucred, NULL, td); - - if (error && (((ioflg & IO_NDELAY) == 0) || error != EAGAIN)) { - break; - } - /* - * If we're locking a file, wait for an answer. Unlocks succeed - * immediately. - */ - if (fl->l_type == F_UNLCK) - /* - * XXX this isn't exactly correct. The client side - * needs to continue sending it's unlock until - * it gets a responce back. - */ - break; - - /* - * retry after 20 seconds if we haven't gotten a responce yet. - * This number was picked out of thin air... but is longer - * then even a reasonably loaded system should take (at least - * on a local network). XXX Probably should use a back-off - * scheme. - */ - if ((error = tsleep((void *)p->p_nlminfo, - PCATCH | PUSER, "lockd", 20*hz)) != 0) { - if (error == EWOULDBLOCK) { - /* - * We timed out, so we rewrite the request - * to the fifo, but only if it isn't already - * full. - */ - ioflg |= IO_NDELAY; - continue; - } - - break; - } - - if (msg.lm_getlk && p->p_nlminfo->retcode == 0) { - if (p->p_nlminfo->set_getlk_pid) { - fl->l_pid = p->p_nlminfo->getlk_pid; - } else { - fl->l_type = F_UNLCK; - } - } - error = p->p_nlminfo->retcode; - break; - } - - if ((error1 = vn_close(wvp, FWRITE, proc0.p_ucred, td)) && error == 0) - return (error1); - - return (error); -} - -/* - * nfslockdans -- - * NFS advisory byte-level locks answer from the lock daemon. - */ -int -nfslockdans(p, ansp) - struct proc *p; - struct lockd_ans *ansp; -{ - int error; - - /* Let root, or someone who once was root (lockd generally - * switches to the daemon uid once it is done setting up) make - * this call. - * - * XXX This authorization check is probably not right. - */ - if ((error = suser(p)) != 0 && p->p_ucred->cr_svuid != 0) - return (error); - - /* the version should match, or we're out of sync */ - if (ansp->la_vers != LOCKD_ANS_VERSION) - return (EINVAL); - - /* Find the process, set its return errno and wake it up. */ - if ((p = pfind(ansp->la_msg_ident.pid)) == NULL) - return (ESRCH); - - /* verify the pid hasn't been reused (if we can), and it isn't waiting - * for an answer from a more recent request. We return an EPIPE if - * the match fails, because we've already used ESRCH above, and this - * is sort of like writing on a pipe after the reader has closed it. - */ - if (p->p_nlminfo == NULL || - ((ansp->la_msg_ident.msg_seq != -1) && - (timevalcmp(&p->p_nlminfo->pid_start, - &ansp->la_msg_ident.pid_start, !=) || - p->p_nlminfo->msg_seq != ansp->la_msg_ident.msg_seq))) { - PROC_UNLOCK(p); - return (EPIPE); - } - - p->p_nlminfo->retcode = ansp->la_errno; - p->p_nlminfo->set_getlk_pid = ansp->la_set_getlk_pid; - p->p_nlminfo->getlk_pid = ansp->la_getlk_pid; - - (void)wakeup((void *)p->p_nlminfo); - - PROC_UNLOCK(p); - return (0); -} |