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[src/perseant-stdc-iso10646]: src/sys/fs/union 3095096
details: https://anonhg.NetBSD.org/src/rev/e195edd3c9f6
branches: perseant-stdc-iso10646
changeset: 850659:e195edd3c9f6
user: hannken <hannken%NetBSD.org@localhost>
date: Mon Jul 17 09:22:37 2017 +0000
description:
3095096
diffstat:
sys/fs/union/union.h | 182 ++++++
sys/fs/union/union_subr.c | 1227 +++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 1409 insertions(+), 0 deletions(-)
diffs (truncated from 1417 to 300 lines):
diff -r ce9c99e91606 -r e195edd3c9f6 sys/fs/union/union.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/fs/union/union.h Mon Jul 17 09:22:37 2017 +0000
@@ -0,0 +1,182 @@
+/* $NetBSD: union.h,v 1.29.2.2 2017/07/17 09:22:37 hannken Exp $ */
+
+/*
+ * Copyright (c) 1994 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software donated to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * 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.
+ *
+ * @(#)union.h 8.9 (Berkeley) 12/10/94
+ */
+
+/*
+ * Copyright (c) 1994 Jan-Simon Pendry.
+ * All rights reserved.
+ *
+ * This code is derived from software donated to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * 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.
+ *
+ * @(#)union.h 8.9 (Berkeley) 12/10/94
+ */
+
+#ifndef _MISCFS_UNION_H_
+#define _MISCFS_UNION_H_
+
+struct union_args {
+ char *target; /* Target of loopback */
+ int mntflags; /* Options on the mount */
+};
+
+#define UNMNT_ABOVE 0x0001 /* Target appears below mount point */
+#define UNMNT_BELOW 0x0002 /* Target appears below mount point */
+#define UNMNT_REPLACE 0x0003 /* Target replaces mount point */
+#define UNMNT_OPMASK 0x0003
+
+#define UNMNT_BITS "\177\20" \
+ "b\00above\0b\01below\0b\02replace\0"
+
+#ifdef _KERNEL
+
+struct union_mount {
+ struct vnode *um_uppervp;
+ struct vnode *um_lowervp;
+ kauth_cred_t um_cred; /* Credentials of user calling mount */
+ int um_cmode; /* cmask from mount process */
+ int um_op; /* Operation mode */
+};
+
+/*
+ * DEFDIRMODE is the mode bits used to create a shadow directory.
+ */
+#define UN_DIRMODE (S_IRWXU|S_IRWXG|S_IRWXO)
+#define UN_FILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
+
+/*
+ * A cache of vnode references.
+ * Lock requirements are:
+ *
+ * : stable
+ * c unheadlock[hash]
+ * l un_lock
+ * m un_lock or vnode lock to read, un_lock and
+ * exclusive vnode lock to write
+ * v vnode lock to read, exclusive vnode lock to write
+ *
+ * Lock order is vnode then un_lock.
+ */
+struct union_node {
+ kmutex_t un_lock;
+ LIST_ENTRY(union_node) un_cache; /* c: Hash chain */
+ int un_refs; /* c: Reference counter */
+ struct mount *un_mount; /* c: union mount */
+ struct vnode *un_vnode; /* :: Back pointer */
+ struct vnode *un_uppervp; /* m: overlaying object */
+ struct vnode *un_lowervp; /* v: underlying object */
+ struct vnode *un_dirvp; /* v: Parent dir of uppervp */
+ struct vnode *un_pvp; /* v: Parent vnode */
+ char *un_path; /* v: saved component name */
+ int un_openl; /* v: # of opens on lowervp */
+ unsigned int un_cflags; /* c: cache flags */
+ struct vnode **un_dircache; /* v: cached union stack */
+ off_t un_uppersz; /* l: size of upper object */
+ off_t un_lowersz; /* l: size of lower object */
+};
+
+#define UN_CACHED 0x10 /* In union cache */
+
+extern int union_allocvp(struct vnode **, struct mount *,
+ struct vnode *, struct vnode *,
+ struct componentname *, struct vnode *,
+ struct vnode *, int);
+extern int union_check_rmdir(struct union_node *, kauth_cred_t);
+extern int union_copyfile(struct vnode *, struct vnode *, kauth_cred_t,
+ struct lwp *);
+extern int union_copyup(struct union_node *, int, kauth_cred_t,
+ struct lwp *);
+extern void union_diruncache(struct union_node *);
+extern int union_dowhiteout(struct union_node *, kauth_cred_t);
+extern int union_mkshadow(struct union_mount *, struct vnode *,
+ struct componentname *, struct vnode **);
+extern int union_mkwhiteout(struct union_mount *, struct vnode *,
+ struct componentname *, struct union_node *);
+extern int union_vn_create(struct vnode **, struct union_node *,
+ struct lwp *);
+extern int union_cn_close(struct vnode *, int, kauth_cred_t,
+ struct lwp *);
+extern void union_removed_upper(struct union_node *un);
+extern struct vnode *union_lowervp(struct vnode *);
+extern void union_newsize(struct vnode *, off_t, off_t);
+int union_readdirhook(struct vnode **, struct file *, struct lwp *);
+
+VFS_PROTOS(union);
+
+#define MOUNTTOUNIONMOUNT(mp) ((struct union_mount *)((mp)->mnt_data))
+#define VTOUNION(vp) ((struct union_node *)(vp)->v_data)
+#define UNIONTOV(un) ((un)->un_vnode)
+#define LOWERVP(vp) (VTOUNION(vp)->un_lowervp)
+#define UPPERVP(vp) (VTOUNION(vp)->un_uppervp)
+#define OTHERVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : LOWERVP(vp))
+#define LOCKVP(vp) (UPPERVP(vp) ? UPPERVP(vp) : (vp))
+
+extern int (**union_vnodeop_p)(void *);
+
+void union_init(void);
+void union_reinit(void);
+void union_done(void);
+int union_freevp(struct vnode *);
+
+#endif /* _KERNEL */
+#endif /* _MISCFS_UNION_H_ */
diff -r ce9c99e91606 -r e195edd3c9f6 sys/fs/union/union_subr.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/fs/union/union_subr.c Mon Jul 17 09:22:37 2017 +0000
@@ -0,0 +1,1227 @@
+/* $NetBSD: union_subr.c,v 1.76.2.2 2017/07/17 09:22:37 hannken Exp $ */
+
+/*
+ * Copyright (c) 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * 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.
+ *
+ * @(#)union_subr.c 8.20 (Berkeley) 5/20/95
+ */
+
+/*
+ * Copyright (c) 1994 Jan-Simon Pendry
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * 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.
+ *
+ * @(#)union_subr.c 8.20 (Berkeley) 5/20/95
+ */
+
+#include <sys/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: union_subr.c,v 1.76.2.2 2017/07/17 09:22:37 hannken Exp $");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/time.h>
+#include <sys/kernel.h>
+#include <sys/vnode.h>
+#include <sys/namei.h>
+#include <sys/malloc.h>
+#include <sys/dirent.h>
+#include <sys/file.h>
+#include <sys/filedesc.h>
+#include <sys/queue.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <sys/kauth.h>
+
+#include <uvm/uvm_extern.h>
+
+#include <fs/union/union.h>
+#include <miscfs/genfs/genfs.h>
+#include <miscfs/specfs/specdev.h>
+
+static LIST_HEAD(uhashhead, union_node) *uhashtbl;
+static u_long uhash_mask; /* size of hash table - 1 */
+#define UNION_HASH(u, l) \
+ ((((u_long) (u) + (u_long) (l)) >> 8) & uhash_mask)
+#define NOHASH ((u_long)-1)
+
+static kmutex_t uhash_lock;
+
+static void union_newupper(struct union_node *, struct vnode *);
+static void union_newlower(struct union_node *, struct vnode *);
+static void union_ref(struct union_node *);
+static void union_rele(struct union_node *);
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