/*ARGSUSED*/
static void
autofs_zone_destructor(zoneid_t zoneid, void *arg)
{
	struct autofs_globals *fngp = arg;
	vnode_t *vp;

	if (fngp == NULL)
		return;
	ASSERT(fngp->fng_fnnode_count == 1);
	ASSERT(fngp->fng_unmount_threads == 0);
	/*
	 * vn_alloc() initialized the rootnode with a count of 1; we need to
	 * make this 0 to placate auto_freefnnode().
	 */
	vp = fntovn(fngp->fng_rootfnnodep);
	ASSERT(vp->v_count == 1);
	vp->v_count--;
	auto_freefnnode(fngp->fng_rootfnnodep);
	mutex_destroy(&fngp->fng_unmount_threads_lock);
	kmem_free(fngp, sizeof (*fngp));
}
示例#2
0
/* ARGSUSED */
static int
auto_readdir(
	vnode_t *vp,
	uio_t *uiop,
	cred_t *cred,
	int *eofp,
	caller_context_t *ct,
	int flags)
{
	struct autofs_rddirargs	rda;
	autofs_rddirres rd;
	fnnode_t *fnp = vntofn(vp);
	fnnode_t *cfnp, *nfnp;
	dirent64_t *dp;
	ulong_t offset;
	ulong_t outcount = 0, count = 0;
	size_t namelen;
	ulong_t alloc_count;
	void *outbuf = NULL;
	fninfo_t *fnip = vfstofni(vp->v_vfsp);
	struct iovec *iovp;
	int error = 0;
	int reached_max = 0;
	int myeof = 0;
	int this_reclen;
	struct autofs_globals *fngp = vntofn(fnip->fi_rootvp)->fn_globals;

	AUTOFS_DPRINT((4, "auto_readdir vp=%p offset=%lld\n",
	    (void *)vp, uiop->uio_loffset));

	if (eofp != NULL)
		*eofp = 0;

	if (uiop->uio_iovcnt != 1)
		return (EINVAL);

	iovp = uiop->uio_iov;
	alloc_count = iovp->iov_len;

	gethrestime(&fnp->fn_atime);
	fnp->fn_ref_time = fnp->fn_atime.tv_sec;

	dp = outbuf = kmem_zalloc(alloc_count, KM_SLEEP);

	/*
	 * Held when getdents calls VOP_RWLOCK....
	 */
	ASSERT(RW_READ_HELD(&fnp->fn_rwlock));
	if (uiop->uio_offset >= AUTOFS_DAEMONCOOKIE) {
again:
		/*
		 * Do readdir of daemon contents only
		 * Drop readers lock and reacquire after reply.
		 */
		rw_exit(&fnp->fn_rwlock);
		bzero(&rd, sizeof (struct autofs_rddirres));
		count = 0;
		rda.rda_map = fnip->fi_map;
		rda.rda_offset = (uint_t)uiop->uio_offset;
		rd.rd_rddir.rddir_entries = dp;
		rda.rda_count = rd.rd_rddir.rddir_size = (uint_t)alloc_count;
		rda.uid = crgetuid(cred);

		error = auto_calldaemon(fngp->fng_zoneid,
		    AUTOFS_READDIR,
		    xdr_autofs_rddirargs,
		    &rda,
		    xdr_autofs_rddirres,
		    (void *)&rd,
		    sizeof (autofs_rddirres),
		    TRUE);

		/*
		 * reacquire previously dropped lock
		 */
		rw_enter(&fnp->fn_rwlock, RW_READER);

		if (!error) {
			error = rd.rd_status;
			dp = rd.rd_rddir.rddir_entries;
		}

		if (error) {
			if (error == AUTOFS_SHUTDOWN) {
				/*
				 * treat as empty directory
				 */
				error = 0;
				myeof = 1;
				if (eofp)
					*eofp = 1;
			}
			goto done;
		}
		if (rd.rd_rddir.rddir_size) {
			dirent64_t *odp = dp;   /* next in output buffer */
			dirent64_t *cdp = dp;   /* current examined entry */

			/*
			 * Check for duplicates here
			 */
			do {
				this_reclen = cdp->d_reclen;
				if (auto_search(fnp, cdp->d_name,
				    NULL, cred)) {
					/*
					 * entry not found in kernel list,
					 * include it in readdir output.
					 *
					 * If we are skipping entries. then
					 * we need to copy this entry to the
					 * correct position in the buffer
					 * to be copied out.
					 */
					if (cdp != odp)
						bcopy(cdp, odp,
						    (size_t)this_reclen);
					odp = nextdp(odp);
					outcount += this_reclen;
				} else {
					/*
					 * Entry was found in the kernel
					 * list. If it is the first entry
					 * in this buffer, then just skip it
					 */
					if (odp == dp) {
						dp = nextdp(dp);
						odp = dp;
					}
				}
				count += this_reclen;
				cdp = (struct dirent64 *)
				    ((char *)cdp + this_reclen);
			} while (count < rd.rd_rddir.rddir_size);

			if (outcount)
				error = uiomove(dp, outcount, UIO_READ, uiop);
			uiop->uio_offset = rd.rd_rddir.rddir_offset;
		} else {
			if (rd.rd_rddir.rddir_eof == 0) {
				/*
				 * alloc_count not large enough for one
				 * directory entry
				 */
				error = EINVAL;
			}
		}
		if (rd.rd_rddir.rddir_eof && !error) {
			myeof = 1;
			if (eofp)
				*eofp = 1;
		}
		if (!error && !myeof && outcount == 0) {
			/*
			 * call daemon with new cookie, all previous
			 * elements happened to be duplicates
			 */
			dp = outbuf;
			goto again;
		}
		goto done;
	}

	if (uiop->uio_offset == 0) {
		/*
		 * first time: so fudge the . and ..
		 */
		this_reclen = DIRENT64_RECLEN(1);
		if (alloc_count < this_reclen) {
			error = EINVAL;
			goto done;
		}
		dp->d_ino = (ino64_t)fnp->fn_nodeid;
		dp->d_off = (off64_t)1;
		dp->d_reclen = (ushort_t)this_reclen;

		/* use strncpy(9f) to zero out uninitialized bytes */

		(void) strncpy(dp->d_name, ".",
		    DIRENT64_NAMELEN(this_reclen));
		outcount += dp->d_reclen;
		dp = nextdp(dp);

		this_reclen = DIRENT64_RECLEN(2);
		if (alloc_count < outcount + this_reclen) {
			error = EINVAL;
			goto done;
		}
		dp->d_reclen = (ushort_t)this_reclen;
		dp->d_ino = (ino64_t)fnp->fn_parent->fn_nodeid;
		dp->d_off = (off64_t)2;

		/* use strncpy(9f) to zero out uninitialized bytes */

		(void) strncpy(dp->d_name, "..",
		    DIRENT64_NAMELEN(this_reclen));
		outcount += dp->d_reclen;
		dp = nextdp(dp);
	}

	offset = 2;
	cfnp = fnp->fn_dirents;
	while (cfnp != NULL) {
		nfnp = cfnp->fn_next;
		offset = cfnp->fn_offset;
		if ((offset >= uiop->uio_offset) &&
		    (!(cfnp->fn_flags & MF_LOOKUP))) {
			int reclen;

			/*
			 * include node only if its offset is greater or
			 * equal to the one required and it is not in
			 * transient state (not being looked-up)
			 */
			namelen = strlen(cfnp->fn_name);
			reclen = (int)DIRENT64_RECLEN(namelen);
			if (outcount + reclen > alloc_count) {
				reached_max = 1;
				break;
			}
			dp->d_reclen = (ushort_t)reclen;
			dp->d_ino = (ino64_t)cfnp->fn_nodeid;
			if (nfnp != NULL) {
				/*
				 * get the offset of the next element
				 */
				dp->d_off = (off64_t)nfnp->fn_offset;
			} else {
				/*
				 * This is the last element, make
				 * offset one plus the current
				 */
				dp->d_off = (off64_t)cfnp->fn_offset + 1;
			}

			/* use strncpy(9f) to zero out uninitialized bytes */

			(void) strncpy(dp->d_name, cfnp->fn_name,
			    DIRENT64_NAMELEN(reclen));
			outcount += dp->d_reclen;
			dp = nextdp(dp);
		}
		cfnp = nfnp;
	}

	if (outcount)
		error = uiomove(outbuf, outcount, UIO_READ, uiop);

	if (!error) {
		if (reached_max) {
			/*
			 * This entry did not get added to the buffer on this,
			 * call. We need to add it on the next call therefore
			 * set uio_offset to this entry's offset.  If there
			 * wasn't enough space for one dirent, return EINVAL.
			 */
			uiop->uio_offset = offset;
			if (outcount == 0)
				error = EINVAL;
		} else if (autofs_nobrowse ||
		    auto_nobrowse_option(fnip->fi_opts) ||
		    (fnip->fi_flags & MF_DIRECT) ||
		    (fnp->fn_trigger != NULL) ||
		    (((vp->v_flag & VROOT) == 0) &&
		    ((fntovn(fnp->fn_parent))->v_flag & VROOT) &&
		    (fnp->fn_dirents == NULL))) {
			/*
			 * done reading directory entries
			 */
			uiop->uio_offset = offset + 1;
			if (eofp)
				*eofp = 1;
		} else {
			/*
			 * Need to get the rest of the entries from the daemon.
			 */
			uiop->uio_offset = AUTOFS_DAEMONCOOKIE;
		}
	}

done:
	kmem_free(outbuf, alloc_count);
	AUTOFS_DPRINT((5, "auto_readdir vp=%p offset=%lld eof=%d\n",
	    (void *)vp, uiop->uio_loffset, myeof));
	return (error);
}
示例#3
0
static int
auto_lookup(
	vnode_t *dvp,
	char *nm,
	vnode_t **vpp,
	pathname_t *pnp,
	int flags,
	vnode_t *rdir,
	cred_t *cred,
	caller_context_t *ct,
	int *direntflags,
	pathname_t *realpnp)
{
	int error = 0;
	vnode_t *newvp = NULL;
	vfs_t *vfsp;
	fninfo_t *dfnip;
	fnnode_t *dfnp = NULL;
	fnnode_t *fnp = NULL;
	char *searchnm;
	int operation;		/* either AUTOFS_LOOKUP or AUTOFS_MOUNT */

	dfnip = vfstofni(dvp->v_vfsp);
	AUTOFS_DPRINT((3, "auto_lookup: dvp=%p (%s) name=%s\n",
	    (void *)dvp, dfnip->fi_map, nm));

	if (nm[0] == 0) {
		VN_HOLD(dvp);
		*vpp = dvp;
		return (0);
	}

	if (error = VOP_ACCESS(dvp, VEXEC, 0, cred, ct))
		return (error);

	if (nm[0] == '.' && nm[1] == 0) {
		VN_HOLD(dvp);
		*vpp = dvp;
		return (0);
	}

	if (nm[0] == '.' && nm[1] == '.' && nm[2] == 0) {
		fnnode_t *pdfnp;

		pdfnp = (vntofn(dvp))->fn_parent;
		ASSERT(pdfnp != NULL);

		/*
		 * Since it is legitimate to have the VROOT flag set for the
		 * subdirectories of the indirect map in autofs filesystem,
		 * rootfnnodep is checked against fnnode of dvp instead of
		 * just checking whether VROOT flag is set in dvp
		 */

		if (pdfnp == pdfnp->fn_globals->fng_rootfnnodep) {
			vnode_t *vp;

			vfs_rlock_wait(dvp->v_vfsp);
			if (dvp->v_vfsp->vfs_flag & VFS_UNMOUNTED) {
				vfs_unlock(dvp->v_vfsp);
				return (EIO);
			}
			vp = dvp->v_vfsp->vfs_vnodecovered;
			VN_HOLD(vp);
			vfs_unlock(dvp->v_vfsp);
			error = VOP_LOOKUP(vp, nm, vpp, pnp, flags, rdir, cred,
			    ct, direntflags, realpnp);
			VN_RELE(vp);
			return (error);
		} else {
			*vpp = fntovn(pdfnp);
			VN_HOLD(*vpp);
			return (0);
		}
	}

top:
	dfnp = vntofn(dvp);
	searchnm = nm;
	operation = 0;

	ASSERT(vn_matchops(dvp, auto_vnodeops));

	AUTOFS_DPRINT((3, "auto_lookup: dvp=%p dfnp=%p\n", (void *)dvp,
	    (void *)dfnp));

	/*
	 * If a lookup or mount of this node is in progress, wait for it
	 * to finish, and return whatever result it got.
	 */
	mutex_enter(&dfnp->fn_lock);
	if (dfnp->fn_flags & (MF_LOOKUP | MF_INPROG)) {
		mutex_exit(&dfnp->fn_lock);
		error = auto_wait4mount(dfnp);
		if (error == AUTOFS_SHUTDOWN)
			error = ENOENT;
		if (error == EAGAIN)
			goto top;
		if (error)
			return (error);
	} else
		mutex_exit(&dfnp->fn_lock);


	error = vn_vfsrlock_wait(dvp);
	if (error)
		return (error);
	vfsp = vn_mountedvfs(dvp);
	if (vfsp != NULL) {
		error = VFS_ROOT(vfsp, &newvp);
		vn_vfsunlock(dvp);
		if (!error) {
			error = VOP_LOOKUP(newvp, nm, vpp, pnp,
			    flags, rdir, cred, ct, direntflags, realpnp);
			VN_RELE(newvp);
		}
		return (error);
	}
	vn_vfsunlock(dvp);

	rw_enter(&dfnp->fn_rwlock, RW_READER);
	error = auto_search(dfnp, nm, &fnp, cred);
	if (error) {
		if (dfnip->fi_flags & MF_DIRECT) {
			/*
			 * direct map.
			 */
			if (dfnp->fn_dirents) {
				/*
				 * Mount previously triggered.
				 * 'nm' not found
				 */
				error = ENOENT;
			} else {
				/*
				 * I need to contact the daemon to trigger
				 * the mount. 'dfnp' will be the mountpoint.
				 */
				operation = AUTOFS_MOUNT;
				VN_HOLD(fntovn(dfnp));
				fnp = dfnp;
				error = 0;
			}
		} else if (dvp == dfnip->fi_rootvp) {
			/*
			 * 'dfnp' is the root of the indirect AUTOFS.
			 */
			if (rw_tryupgrade(&dfnp->fn_rwlock) == 0) {
				/*
				 * Could not acquire writer lock, release
				 * reader, and wait until available. We
				 * need to search for 'nm' again, since we
				 * had to release the lock before reacquiring
				 * it.
				 */
				rw_exit(&dfnp->fn_rwlock);
				rw_enter(&dfnp->fn_rwlock, RW_WRITER);
				error = auto_search(dfnp, nm, &fnp, cred);
			}

			ASSERT(RW_WRITE_HELD(&dfnp->fn_rwlock));
			if (error) {
				/*
				 * create node being looked-up and request
				 * mount on it.
				 */
				error = auto_enter(dfnp, nm, &fnp, kcred);
				if (!error)
					operation = AUTOFS_LOOKUP;
			}
		} else if ((dfnp->fn_dirents == NULL) &&
		    ((dvp->v_flag & VROOT) == 0) &&
		    ((fntovn(dfnp->fn_parent))->v_flag & VROOT)) {
			/*
			 * dfnp is the actual 'mountpoint' of indirect map,
			 * it is the equivalent of a direct mount,
			 * ie, /home/'user1'
			 */
			operation = AUTOFS_MOUNT;
			VN_HOLD(fntovn(dfnp));
			fnp = dfnp;
			error = 0;
			searchnm = dfnp->fn_name;
		}
	}

	if (error == EAGAIN) {
		rw_exit(&dfnp->fn_rwlock);
		goto top;
	}
	if (error) {
		rw_exit(&dfnp->fn_rwlock);
		return (error);
	}

	/*
	 * We now have the actual fnnode we're interested in.
	 * The 'MF_LOOKUP' indicates another thread is currently
	 * performing a daemon lookup of this node, therefore we
	 * wait for its completion.
	 * The 'MF_INPROG' indicates another thread is currently
	 * performing a daemon mount of this node, we wait for it
	 * to be done if we are performing a MOUNT. We don't
	 * wait for it if we are performing a LOOKUP.
	 * We can release the reader/writer lock as soon as we acquire
	 * the mutex, since the state of the lock can only change by
	 * first acquiring the mutex.
	 */
	mutex_enter(&fnp->fn_lock);
	rw_exit(&dfnp->fn_rwlock);
	if ((fnp->fn_flags & MF_LOOKUP) ||
	    ((operation == AUTOFS_MOUNT) && (fnp->fn_flags & MF_INPROG))) {
		mutex_exit(&fnp->fn_lock);
		error = auto_wait4mount(fnp);
		VN_RELE(fntovn(fnp));
		if (error == AUTOFS_SHUTDOWN)
			error = ENOENT;
		if (error && error != EAGAIN)
			return (error);
		goto top;
	}

	if (operation == 0) {
		/*
		 * got the fnnode, check for any errors
		 * on the previous operation on that node.
		 */
		error = fnp->fn_error;
		if ((error == EINTR) || (error == EAGAIN)) {
			/*
			 * previous operation on this node was
			 * not completed, do a lookup now.
			 */
			operation = AUTOFS_LOOKUP;
		} else {
			/*
			 * previous operation completed. Return
			 * a pointer to the node only if there was
			 * no error.
			 */
			mutex_exit(&fnp->fn_lock);
			if (!error)
				*vpp = fntovn(fnp);
			else
				VN_RELE(fntovn(fnp));
			return (error);
		}
	}

	/*
	 * Since I got to this point, it means I'm the one
	 * responsible for triggering the mount/look-up of this node.
	 */
	switch (operation) {
	case AUTOFS_LOOKUP:
		AUTOFS_BLOCK_OTHERS(fnp, MF_LOOKUP);
		fnp->fn_error = 0;
		mutex_exit(&fnp->fn_lock);
		error = auto_lookup_aux(fnp, searchnm, cred);
		if (!error) {
			/*
			 * Return this vnode
			 */
			*vpp = fntovn(fnp);
		} else {
			/*
			 * release our reference to this vnode
			 * and return error
			 */
			VN_RELE(fntovn(fnp));
		}
		break;
	case AUTOFS_MOUNT:
		AUTOFS_BLOCK_OTHERS(fnp, MF_INPROG);
		fnp->fn_error = 0;
		mutex_exit(&fnp->fn_lock);
		/*
		 * auto_new_mount_thread fires up a new thread which
		 * calls automountd finishing up the work
		 */
		auto_new_mount_thread(fnp, searchnm, cred);

		/*
		 * At this point, we are simply another thread
		 * waiting for the mount to complete
		 */
		error = auto_wait4mount(fnp);
		if (error == AUTOFS_SHUTDOWN)
			error = ENOENT;

		/*
		 * now release our reference to this vnode
		 */
		VN_RELE(fntovn(fnp));
		if (!error)
			goto top;
		break;
	default:
		auto_log(dfnp->fn_globals->fng_verbose,
		    dfnp->fn_globals->fng_zoneid, CE_WARN,
		    "auto_lookup: unknown operation %d",
		    operation);
	}

	AUTOFS_DPRINT((5, "auto_lookup: name=%s *vpp=%p return=%d\n",
	    nm, (void *)*vpp, error));

	return (error);
}
示例#4
0
/*
 * Triggers the mount if needed. If the mount has been triggered by
 * another thread, it will wait for its return status, and return it.
 * Whether the mount is triggered by this thread, another thread, or
 * if the vnode was already covered, '*newvp' is a
 * VN_HELD vnode pointing to the root of the filesystem covering 'vp'.
 * If the node is not mounted on, and should not be mounted on, '*newvp'
 * will be NULL.
 * The calling routine may use '*newvp' to do the filesystem jump.
 */
static int
auto_trigger_mount(vnode_t *vp, cred_t *cred, vnode_t **newvp)
{
	fnnode_t *fnp = vntofn(vp);
	fninfo_t *fnip = vfstofni(vp->v_vfsp);
	vnode_t *dvp;
	vfs_t *vfsp;
	int delayed_ind;
	char name[AUTOFS_MAXPATHLEN];
	int error;

	AUTOFS_DPRINT((4, "auto_trigger_mount: vp=%p\n", (void *)vp));

	*newvp = NULL;

	/*
	 * Cross-zone mount triggering is disallowed.
	 */
	if (fnip->fi_zoneid != getzoneid())
		return (EPERM);	/* Not owner of mount */

retry:
	error = 0;
	delayed_ind = 0;
	mutex_enter(&fnp->fn_lock);
	while (fnp->fn_flags & (MF_LOOKUP | MF_INPROG)) {
		/*
		 * Mount or lookup in progress,
		 * wait for it before proceeding.
		 */
		mutex_exit(&fnp->fn_lock);
		error = auto_wait4mount(fnp);
		if (error == AUTOFS_SHUTDOWN) {
			error = 0;
			goto done;
		}
		if (error && error != EAGAIN)
			goto done;
		error = 0;
		mutex_enter(&fnp->fn_lock);
	}

	/*
	 * If the vfslock can't be acquired for the first time.
	 * drop the fn_lock and retry next time in blocking mode.
	 */
	if (vn_vfswlock(vp)) {
		/*
		 * Lock held by another thread.
		 * Perform blocking by dropping the
		 * fn_lock.
		 */
		mutex_exit(&fnp->fn_lock);
		error = vn_vfswlock_wait(vp);
		if (error)
			goto done;
		/*
		 * Because fn_lock wasn't held, the state
		 * of the trigger node might have changed.
		 * Need to run through the checks on trigger
		 * node again.
		 */
		vn_vfsunlock(vp);
		goto retry;
	}

	vfsp = vn_mountedvfs(vp);
	if (vfsp != NULL) {
		mutex_exit(&fnp->fn_lock);
		error = VFS_ROOT(vfsp, newvp);
		vn_vfsunlock(vp);
		goto done;
	} else {
		vn_vfsunlock(vp);
		if ((fnp->fn_flags & MF_MOUNTPOINT) &&
		    fnp->fn_trigger != NULL) {
			ASSERT(fnp->fn_dirents == NULL);
			mutex_exit(&fnp->fn_lock);
			/*
			 * The filesystem that used to sit here has been
			 * forcibly unmounted. Do our best to recover.
			 * Try to unmount autofs subtree below this node
			 * and retry the action.
			 */
			if (unmount_subtree(fnp, B_TRUE) != 0) {
				error = EIO;
				goto done;
			}
			goto retry;
		}
	}

	ASSERT(vp->v_type == VDIR);
	dvp = fntovn(fnp->fn_parent);

	if ((fnp->fn_dirents == NULL) &&
	    ((fnip->fi_flags & MF_DIRECT) == 0) &&
	    ((vp->v_flag & VROOT) == 0) &&
	    (dvp->v_flag & VROOT)) {
		/*
		 * If the parent of this node is the root of an indirect
		 * AUTOFS filesystem, this node is remountable.
		 */
		delayed_ind = 1;
	}

	if (delayed_ind ||
	    ((fnip->fi_flags & MF_DIRECT) && (fnp->fn_dirents == NULL))) {
		/*
		 * Trigger mount since:
		 * direct mountpoint with no subdirs or
		 * delayed indirect.
		 */
		AUTOFS_BLOCK_OTHERS(fnp, MF_INPROG);
		fnp->fn_error = 0;
		mutex_exit(&fnp->fn_lock);
		if (delayed_ind)
			(void) strcpy(name, fnp->fn_name);
		else
			(void) strcpy(name, ".");
		fnp->fn_ref_time = gethrestime_sec();
		auto_new_mount_thread(fnp, name, cred);
		/*
		 * At this point we're simply another thread waiting
		 * for the mount to finish.
		 */
		error = auto_wait4mount(fnp);
		if (error == EAGAIN)
			goto retry;
		if (error == AUTOFS_SHUTDOWN) {
			error = 0;
			goto done;
		}
		if (error == 0) {
			if (error = vn_vfsrlock_wait(vp))
				goto done;
			/* Reacquire after dropping locks */
			vfsp = vn_mountedvfs(vp);
			if (vfsp != NULL) {
				error = VFS_ROOT(vfsp, newvp);
				vn_vfsunlock(vp);
			} else {
				vn_vfsunlock(vp);
				goto retry;
			}
		}
	} else
		mutex_exit(&fnp->fn_lock);

done:
	AUTOFS_DPRINT((5, "auto_trigger_mount: error=%d\n", error));
	return (error);
}