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freebsd-dev/sys/gnu/fs/ext2fs/ext2_vnops.c
Poul-Henning Kamp aec0fb7b40 Back when VOP_* was introduced, we did not have new-style struct 
initializations but we did have lofty goals and big ideals.

Adjust to more contemporary circumstances and gain type checking.

	Replace the entire vop_t frobbing thing with properly typed
	structures.  The only casualty is that we can not add a new
	VOP_ method with a loadable module.  History has not given
	us reason to belive this would ever be feasible in the the
	first place.

	Eliminate in toto VOCALL(), vop_t, VNODEOP_SET() etc.

	Give coda correct prototypes and function definitions for
	all vop_()s.

	Generate a bit more data from the vnode_if.src file:  a
	struct vop_vector and protype typedefs for all vop methods.

	Add a new vop_bypass() and make vop_default be a pointer
	to another struct vop_vector.

	Remove a lot of vfs_init since vop_vector is ready to use
	from the compiler.

	Cast various vop_mumble() to void * with uppercase name,
	for instance VOP_PANIC, VOP_NULL etc.

	Implement VCALL() by making vdesc_offset the offsetof() the
	relevant function pointer in vop_vector.  This is disgusting
	but since the code is generated by a script comparatively
	safe.  The alternative for nullfs etc. would be much worse.

	Fix up all vnode method vectors to remove casts so they
	become typesafe.  (The bulk of this is generated by scripts)
2004-12-01 23:16:38 +00:00

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/*
* modified for EXT2FS support in Lites 1.1
*
* Aug 1995, Godmar Back (gback@cs.utah.edu)
* University of Utah, Department of Computer Science
*/
/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* 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.
* 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.
*
* @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94
* @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
* $FreeBSD$
*/
#include "opt_suiddir.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/unistd.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <sys/namei.h>
#include <sys/lockf.h>
#include <sys/event.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vnode_pager.h>
#include <fs/fifofs/fifo.h>
#include <sys/signalvar.h>
#include <ufs/ufs/dir.h>
#include <gnu/ext2fs/inode.h>
#include <gnu/ext2fs/ext2_mount.h>
#include <gnu/ext2fs/ext2_fs_sb.h>
#include <gnu/ext2fs/fs.h>
#include <gnu/ext2fs/ext2_extern.h>
#include <gnu/ext2fs/ext2_fs.h>
static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
static vop_access_t ext2_access;
static vop_advlock_t ext2_advlock;
static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
struct thread *);
static vop_close_t ext2_close;
static vop_create_t ext2_create;
static vop_fsync_t ext2_fsync;
static vop_getattr_t ext2_getattr;
static vop_kqfilter_t ext2_kqfilter;
static vop_link_t ext2_link;
static vop_mkdir_t ext2_mkdir;
static vop_mknod_t ext2_mknod;
static vop_open_t ext2_open;
static vop_pathconf_t ext2_pathconf;
static vop_print_t ext2_print;
static vop_read_t ext2_read;
static vop_readlink_t ext2_readlink;
static vop_remove_t ext2_remove;
static vop_rename_t ext2_rename;
static vop_rmdir_t ext2_rmdir;
static vop_setattr_t ext2_setattr;
static vop_strategy_t ext2_strategy;
static vop_symlink_t ext2_symlink;
static vop_write_t ext2_write;
static vop_close_t ext2fifo_close;
static vop_kqfilter_t ext2fifo_kqfilter;
static vop_read_t ext2fifo_read;
static vop_write_t ext2fifo_write;
static int filt_ext2read(struct knote *kn, long hint);
static int filt_ext2write(struct knote *kn, long hint);
static int filt_ext2vnode(struct knote *kn, long hint);
static void filt_ext2detach(struct knote *kn);
/* Global vfs data structures for ext2. */
struct vop_vector ext2_vnodeops = {
.vop_default = &default_vnodeops,
.vop_access = ext2_access,
.vop_advlock = ext2_advlock,
.vop_bmap = ext2_bmap,
.vop_cachedlookup = ext2_lookup,
.vop_close = ext2_close,
.vop_create = ext2_create,
.vop_fsync = ext2_fsync,
.vop_getattr = ext2_getattr,
.vop_inactive = ext2_inactive,
.vop_link = ext2_link,
.vop_lookup = vfs_cache_lookup,
.vop_mkdir = ext2_mkdir,
.vop_mknod = ext2_mknod,
.vop_open = ext2_open,
.vop_pathconf = ext2_pathconf,
.vop_poll = vop_stdpoll,
.vop_kqfilter = ext2_kqfilter,
.vop_print = ext2_print,
.vop_read = ext2_read,
.vop_readdir = ext2_readdir,
.vop_readlink = ext2_readlink,
.vop_reallocblks = ext2_reallocblks,
.vop_reclaim = ext2_reclaim,
.vop_remove = ext2_remove,
.vop_rename = ext2_rename,
.vop_rmdir = ext2_rmdir,
.vop_setattr = ext2_setattr,
.vop_strategy = ext2_strategy,
.vop_symlink = ext2_symlink,
.vop_write = ext2_write,
};
struct vop_vector ext2_fifoops = {
.vop_default = &fifo_specops,
.vop_access = ext2_access,
.vop_close = ext2fifo_close,
.vop_fsync = ext2_fsync,
.vop_getattr = ext2_getattr,
.vop_inactive = ext2_inactive,
.vop_kqfilter = ext2fifo_kqfilter,
.vop_print = ext2_print,
.vop_read = ext2fifo_read,
.vop_reclaim = ext2_reclaim,
.vop_setattr = ext2_setattr,
.vop_write = ext2fifo_write,
};
#include <gnu/ext2fs/ext2_readwrite.c>
/*
* A virgin directory (no blushing please).
* Note that the type and namlen fields are reversed relative to ext2.
* Also, we don't use `struct odirtemplate', since it would just cause
* endianness problems.
*/
static struct dirtemplate mastertemplate = {
0, 12, 1, EXT2_FT_DIR, ".",
0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
};
static struct dirtemplate omastertemplate = {
0, 12, 1, EXT2_FT_UNKNOWN, ".",
0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
};
void
ext2_itimes(vp)
struct vnode *vp;
{
struct inode *ip;
struct timespec ts;
ip = VTOI(vp);
if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
return;
if ((vp->v_type == VBLK || vp->v_type == VCHR))
ip->i_flag |= IN_LAZYMOD;
else
ip->i_flag |= IN_MODIFIED;
if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
vfs_timestamp(&ts);
if (ip->i_flag & IN_ACCESS) {
ip->i_atime = ts.tv_sec;
ip->i_atimensec = ts.tv_nsec;
}
if (ip->i_flag & IN_UPDATE) {
ip->i_mtime = ts.tv_sec;
ip->i_mtimensec = ts.tv_nsec;
ip->i_modrev++;
}
if (ip->i_flag & IN_CHANGE) {
ip->i_ctime = ts.tv_sec;
ip->i_ctimensec = ts.tv_nsec;
}
}
ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
}
/*
* Create a regular file
*/
static int
ext2_create(ap)
struct vop_create_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
int error;
error =
ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
ap->a_dvp, ap->a_vpp, ap->a_cnp);
if (error)
return (error);
return (0);
}
/*
* Open called.
*
* Nothing to do.
*/
static int
ext2_open(ap)
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
return (EOPNOTSUPP);
/*
* Files marked append-only must be opened for appending.
*/
if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
(ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
return (EPERM);
return (0);
}
/*
* Close called.
*
* Update the times on the inode.
*/
static int
ext2_close(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct mount *mp;
VI_LOCK(vp);
if (vp->v_usecount > 1) {
ext2_itimes(vp);
VI_UNLOCK(vp);
} else {
VI_UNLOCK(vp);
/*
* If we are closing the last reference to an unlinked
* file, then it will be freed by the inactive routine.
* Because the freeing causes a the filesystem to be
* modified, it must be held up during periods when the
* filesystem is suspended.
*
* XXX - EAGAIN is returned to prevent vn_close from
* repeating the vrele operation.
*/
if (vp->v_type == VREG && VTOI(vp)->i_nlink == 0) {
(void) vn_start_write(vp, &mp, V_WAIT);
vrele(vp);
vn_finished_write(mp);
return (EAGAIN);
}
}
return (0);
}
static int
ext2_access(ap)
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
mode_t mode = ap->a_mode;
int error;
if (vp->v_type == VBLK || vp->v_type == VCHR)
return (EOPNOTSUPP);
/*
* Disallow write attempts on read-only file systems;
* 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:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
break;
default:
break;
}
}
/* If immutable bit set, nobody gets to write it. */
if ((mode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT)))
return (EPERM);
error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
ap->a_mode, ap->a_cred, NULL);
return (error);
}
static int
ext2_getattr(ap)
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct vattr *vap = ap->a_vap;
ext2_itimes(vp);
/*
* Copy from inode table
*/
vap->va_fsid = dev2udev(ip->i_dev);
vap->va_fileid = ip->i_number;
vap->va_mode = ip->i_mode & ~IFMT;
vap->va_nlink = ip->i_nlink;
vap->va_uid = ip->i_uid;
vap->va_gid = ip->i_gid;
vap->va_rdev = ip->i_rdev;
vap->va_size = ip->i_size;
vap->va_atime.tv_sec = ip->i_atime;
vap->va_atime.tv_nsec = ip->i_atimensec;
vap->va_mtime.tv_sec = ip->i_mtime;
vap->va_mtime.tv_nsec = ip->i_mtimensec;
vap->va_ctime.tv_sec = ip->i_ctime;
vap->va_ctime.tv_nsec = ip->i_ctimensec;
vap->va_flags = ip->i_flags;
vap->va_gen = ip->i_gen;
vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
vap->va_type = IFTOVT(ip->i_mode);
vap->va_filerev = ip->i_modrev;
return (0);
}
/*
* Set attribute vnode op. called from several syscalls
*/
static int
ext2_setattr(ap)
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
struct vattr *vap = ap->a_vap;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct ucred *cred = ap->a_cred;
struct thread *td = ap->a_td;
int error;
/*
* Check for unsettable attributes.
*/
if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
(vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
(vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
return (EINVAL);
}
if (vap->va_flags != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
/*
* Callers may only modify the file flags on objects they
* have VADMIN rights for.
*/
if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
return (error);
/*
* Unprivileged processes and privileged processes in
* jail() are not permitted to unset system flags, or
* modify flags if any system flags are set.
* Privileged non-jail processes may not modify system flags
* if securelevel > 0 and any existing system flags are set.
*/
if (!suser_cred(cred, SUSER_ALLOWJAIL)) {
if (ip->i_flags
& (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
error = securelevel_gt(cred, 0);
if (error)
return (error);
}
ip->i_flags = vap->va_flags;
} else {
if (ip->i_flags
& (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
(vap->va_flags & UF_SETTABLE) != vap->va_flags)
return (EPERM);
ip->i_flags &= SF_SETTABLE;
ip->i_flags |= (vap->va_flags & UF_SETTABLE);
}
ip->i_flag |= IN_CHANGE;
if (vap->va_flags & (IMMUTABLE | APPEND))
return (0);
}
if (ip->i_flags & (IMMUTABLE | APPEND))
return (EPERM);
/*
* Go through the fields and update iff not VNOVAL.
*/
if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
td)) != 0)
return (error);
}
if (vap->va_size != VNOVAL) {
/*
* Disallow write attempts on read-only file systems;
* unless the file is a socket, fifo, or a block or
* character device resident on the file system.
*/
switch (vp->v_type) {
case VDIR:
return (EISDIR);
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
break;
default:
break;
}
if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
return (error);
}
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
/*
* From utimes(2):
* If times is NULL, ... The caller must be the owner of
* the file, have permission to write the file, or be the
* super-user.
* If times is non-NULL, ... The caller must be the owner of
* the file or be the super-user.
*/
if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
(error = VOP_ACCESS(vp, VWRITE, cred, td))))
return (error);
if (vap->va_atime.tv_sec != VNOVAL)
ip->i_flag |= IN_ACCESS;
if (vap->va_mtime.tv_sec != VNOVAL)
ip->i_flag |= IN_CHANGE | IN_UPDATE;
ext2_itimes(vp);
if (vap->va_atime.tv_sec != VNOVAL) {
ip->i_atime = vap->va_atime.tv_sec;
ip->i_atimensec = vap->va_atime.tv_nsec;
}
if (vap->va_mtime.tv_sec != VNOVAL) {
ip->i_mtime = vap->va_mtime.tv_sec;
ip->i_mtimensec = vap->va_mtime.tv_nsec;
}
error = ext2_update(vp, 0);
if (error)
return (error);
}
error = 0;
if (vap->va_mode != (mode_t)VNOVAL) {
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
}
VN_KNOTE_UNLOCKED(vp, NOTE_ATTRIB);
return (error);
}
/*
* Change the mode on a file.
* Inode must be locked before calling.
*/
static int
ext2_chmod(vp, mode, cred, td)
struct vnode *vp;
int mode;
struct ucred *cred;
struct thread *td;
{
struct inode *ip = VTOI(vp);
int error;
/*
* To modify the permissions on a file, must possess VADMIN
* for that file.
*/
if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
return (error);
/*
* Privileged processes may set the sticky bit on non-directories,
* as well as set the setgid bit on a file with a group that the
* process is not a member of.
*/
if (suser_cred(cred, SUSER_ALLOWJAIL)) {
if (vp->v_type != VDIR && (mode & S_ISTXT))
return (EFTYPE);
if (!groupmember(ip->i_gid, cred) && (mode & ISGID))
return (EPERM);
}
ip->i_mode &= ~ALLPERMS;
ip->i_mode |= (mode & ALLPERMS);
ip->i_flag |= IN_CHANGE;
return (0);
}
/*
* Perform chown operation on inode ip;
* inode must be locked prior to call.
*/
static int
ext2_chown(vp, uid, gid, cred, td)
struct vnode *vp;
uid_t uid;
gid_t gid;
struct ucred *cred;
struct thread *td;
{
struct inode *ip = VTOI(vp);
uid_t ouid;
gid_t ogid;
int error = 0;
if (uid == (uid_t)VNOVAL)
uid = ip->i_uid;
if (gid == (gid_t)VNOVAL)
gid = ip->i_gid;
/*
* To modify the ownership of a file, must possess VADMIN
* for that file.
*/
if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
return (error);
/*
* To change the owner of a file, or change the group of a file
* to a group of which we are not a member, the caller must
* have privilege.
*/
if ((uid != ip->i_uid ||
(gid != ip->i_gid && !groupmember(gid, cred))) &&
(error = suser_cred(cred, SUSER_ALLOWJAIL)))
return (error);
ogid = ip->i_gid;
ouid = ip->i_uid;
ip->i_gid = gid;
ip->i_uid = uid;
ip->i_flag |= IN_CHANGE;
if (suser_cred(cred, SUSER_ALLOWJAIL) && (ouid != uid || ogid != gid))
ip->i_mode &= ~(ISUID | ISGID);
return (0);
}
/*
* Synch an open file.
*/
/* ARGSUSED */
static int
ext2_fsync(ap)
struct vop_fsync_args /* {
struct vnode *a_vp;
struct ucred *a_cred;
int a_waitfor;
struct thread *a_td;
} */ *ap;
{
/*
* Flush all dirty buffers associated with a vnode.
*/
ext2_discard_prealloc(VTOI(ap->a_vp));
vop_stdfsync(ap);
return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
}
/*
* Mknod vnode call
*/
/* ARGSUSED */
static int
ext2_mknod(ap)
struct vop_mknod_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
struct vattr *vap = ap->a_vap;
struct vnode **vpp = ap->a_vpp;
struct inode *ip;
ino_t ino;
int error;
error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
ap->a_dvp, vpp, ap->a_cnp);
if (error)
return (error);
ip = VTOI(*vpp);
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
if (vap->va_rdev != VNOVAL) {
/*
* Want to be able to use this to make badblock
* inodes, so don't truncate the dev number.
*/
ip->i_rdev = vap->va_rdev;
}
/*
* Remove inode, then reload it through VFS_VGET so it is
* checked to see if it is an alias of an existing entry in
* the inode cache.
*/
vput(*vpp);
(*vpp)->v_type = VNON;
ino = ip->i_number; /* Save this before vgone() invalidates ip. */
vgone(*vpp);
error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
if (error) {
*vpp = NULL;
return (error);
}
return (0);
}
static int
ext2_remove(ap)
struct vop_remove_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap;
{
struct inode *ip;
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
int error;
ip = VTOI(vp);
if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(VTOI(dvp)->i_flags & APPEND)) {
error = EPERM;
goto out;
}
error = ext2_dirremove(dvp, ap->a_cnp);
if (error == 0) {
ip->i_nlink--;
ip->i_flag |= IN_CHANGE;
}
out:
return (error);
}
/*
* link vnode call
*/
static int
ext2_link(ap)
struct vop_link_args /* {
struct vnode *a_tdvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct vnode *tdvp = ap->a_tdvp;
struct componentname *cnp = ap->a_cnp;
struct inode *ip;
int error;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ext2_link: no name");
#endif
if (tdvp->v_mount != vp->v_mount) {
error = EXDEV;
goto out;
}
ip = VTOI(vp);
if ((nlink_t)ip->i_nlink >= LINK_MAX) {
error = EMLINK;
goto out;
}
if (ip->i_flags & (IMMUTABLE | APPEND)) {
error = EPERM;
goto out;
}
ip->i_nlink++;
ip->i_flag |= IN_CHANGE;
error = ext2_update(vp, 1);
if (!error)
error = ext2_direnter(ip, tdvp, cnp);
if (error) {
ip->i_nlink--;
ip->i_flag |= IN_CHANGE;
}
out:
return (error);
}
/*
* Rename system call.
* See comments in sys/ufs/ufs/ufs_vnops.c
*/
static int
ext2_rename(ap)
struct vop_rename_args /* {
struct vnode *a_fdvp;
struct vnode *a_fvp;
struct componentname *a_fcnp;
struct vnode *a_tdvp;
struct vnode *a_tvp;
struct componentname *a_tcnp;
} */ *ap;
{
struct vnode *tvp = ap->a_tvp;
struct vnode *tdvp = ap->a_tdvp;
struct vnode *fvp = ap->a_fvp;
struct vnode *fdvp = ap->a_fdvp;
struct componentname *tcnp = ap->a_tcnp;
struct componentname *fcnp = ap->a_fcnp;
struct thread *td = fcnp->cn_thread;
struct inode *ip, *xp, *dp;
struct dirtemplate dirbuf;
int doingdirectory = 0, oldparent = 0, newparent = 0;
int error = 0;
u_char namlen;
#ifdef DIAGNOSTIC
if ((tcnp->cn_flags & HASBUF) == 0 ||
(fcnp->cn_flags & HASBUF) == 0)
panic("ext2_rename: no name");
#endif
/*
* Check for cross-device rename.
*/
if ((fvp->v_mount != tdvp->v_mount) ||
(tvp && (fvp->v_mount != tvp->v_mount))) {
error = EXDEV;
abortit:
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
vrele(fdvp);
vrele(fvp);
return (error);
}
if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
(VTOI(tdvp)->i_flags & APPEND))) {
error = EPERM;
goto abortit;
}
/*
* Renaming a file to itself has no effect. The upper layers should
* not call us in that case. Temporarily just warn if they do.
*/
if (fvp == tvp) {
printf("ext2_rename: fvp == tvp (can't happen)\n");
error = 0;
goto abortit;
}
if ((error = vn_lock(fvp, LK_EXCLUSIVE, td)) != 0)
goto abortit;
dp = VTOI(fdvp);
ip = VTOI(fvp);
if (ip->i_nlink >= LINK_MAX) {
VOP_UNLOCK(fvp, 0, td);
error = EMLINK;
goto abortit;
}
if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
|| (dp->i_flags & APPEND)) {
VOP_UNLOCK(fvp, 0, td);
error = EPERM;
goto abortit;
}
if ((ip->i_mode & IFMT) == IFDIR) {
/*
* Avoid ".", "..", and aliases of "." for obvious reasons.
*/
if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
(ip->i_flag & IN_RENAME)) {
VOP_UNLOCK(fvp, 0, td);
error = EINVAL;
goto abortit;
}
ip->i_flag |= IN_RENAME;
oldparent = dp->i_number;
doingdirectory++;
}
vrele(fdvp);
/*
* When the target exists, both the directory
* and target vnodes are returned locked.
*/
dp = VTOI(tdvp);
xp = NULL;
if (tvp)
xp = VTOI(tvp);
/*
* 1) Bump link count while we're moving stuff
* around. If we crash somewhere before
* completing our work, the link count
* may be wrong, but correctable.
*/
ip->i_nlink++;
ip->i_flag |= IN_CHANGE;
if ((error = ext2_update(fvp, 1)) != 0) {
VOP_UNLOCK(fvp, 0, td);
goto bad;
}
/*
* If ".." must be changed (ie the directory gets a new
* parent) then the source directory must not be in the
* directory heirarchy above the target, as this would
* orphan everything below the source directory. Also
* the user must have write permission in the source so
* as to be able to change "..". We must repeat the call
* to namei, as the parent directory is unlocked by the
* call to checkpath().
*/
error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
VOP_UNLOCK(fvp, 0, td);
if (oldparent != dp->i_number)
newparent = dp->i_number;
if (doingdirectory && newparent) {
if (error) /* write access check above */
goto bad;
if (xp != NULL)
vput(tvp);
error = ext2_checkpath(ip, dp, tcnp->cn_cred);
if (error)
goto out;
VREF(tdvp);
error = relookup(tdvp, &tvp, tcnp);
if (error)
goto out;
vrele(tdvp);
dp = VTOI(tdvp);
xp = NULL;
if (tvp)
xp = VTOI(tvp);
}
/*
* 2) If target doesn't exist, link the target
* to the source and unlink the source.
* Otherwise, rewrite the target directory
* entry to reference the source inode and
* expunge the original entry's existence.
*/
if (xp == NULL) {
if (dp->i_dev != ip->i_dev)
panic("ext2_rename: EXDEV");
/*
* Account for ".." in new directory.
* When source and destination have the same
* parent we don't fool with the link count.
*/
if (doingdirectory && newparent) {
if ((nlink_t)dp->i_nlink >= LINK_MAX) {
error = EMLINK;
goto bad;
}
dp->i_nlink++;
dp->i_flag |= IN_CHANGE;
error = ext2_update(tdvp, 1);
if (error)
goto bad;
}
error = ext2_direnter(ip, tdvp, tcnp);
if (error) {
if (doingdirectory && newparent) {
dp->i_nlink--;
dp->i_flag |= IN_CHANGE;
(void)ext2_update(tdvp, 1);
}
goto bad;
}
vput(tdvp);
} else {
if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
panic("ext2_rename: EXDEV");
/*
* Short circuit rename(foo, foo).
*/
if (xp->i_number == ip->i_number)
panic("ext2_rename: same file");
/*
* If the parent directory is "sticky", then the user must
* own the parent directory, or the destination of the rename,
* otherwise the destination may not be changed (except by
* root). This implements append-only directories.
*/
if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
tcnp->cn_cred->cr_uid != dp->i_uid &&
xp->i_uid != tcnp->cn_cred->cr_uid) {
error = EPERM;
goto bad;
}
/*
* Target must be empty if a directory and have no links
* to it. Also, ensure source and target are compatible
* (both directories, or both not directories).
*/
if ((xp->i_mode&IFMT) == IFDIR) {
if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) ||
xp->i_nlink > 2) {
error = ENOTEMPTY;
goto bad;
}
if (!doingdirectory) {
error = ENOTDIR;
goto bad;
}
cache_purge(tdvp);
} else if (doingdirectory) {
error = EISDIR;
goto bad;
}
error = ext2_dirrewrite(dp, ip, tcnp);
if (error)
goto bad;
/*
* If the target directory is in the same
* directory as the source directory,
* decrement the link count on the parent
* of the target directory.
*/
if (doingdirectory && !newparent) {
dp->i_nlink--;
dp->i_flag |= IN_CHANGE;
}
vput(tdvp);
/*
* Adjust the link count of the target to
* reflect the dirrewrite above. If this is
* a directory it is empty and there are
* no links to it, so we can squash the inode and
* any space associated with it. We disallowed
* renaming over top of a directory with links to
* it above, as the remaining link would point to
* a directory without "." or ".." entries.
*/
xp->i_nlink--;
if (doingdirectory) {
if (--xp->i_nlink != 0)
panic("ext2_rename: linked directory");
error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
tcnp->cn_cred, tcnp->cn_thread);
}
xp->i_flag |= IN_CHANGE;
vput(tvp);
xp = NULL;
}
/*
* 3) Unlink the source.
*/
fcnp->cn_flags &= ~MODMASK;
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
VREF(fdvp);
error = relookup(fdvp, &fvp, fcnp);
if (error == 0)
vrele(fdvp);
if (fvp != NULL) {
xp = VTOI(fvp);
dp = VTOI(fdvp);
} else {
/*
* From name has disappeared.
*/
if (doingdirectory)
panic("ext2_rename: lost dir entry");
vrele(ap->a_fvp);
return (0);
}
/*
* Ensure that the directory entry still exists and has not
* changed while the new name has been entered. If the source is
* a file then the entry may have been unlinked or renamed. In
* either case there is no further work to be done. If the source
* is a directory then it cannot have been rmdir'ed; its link
* count of three would cause a rmdir to fail with ENOTEMPTY.
* The IN_RENAME flag ensures that it cannot be moved by another
* rename.
*/
if (xp != ip) {
if (doingdirectory)
panic("ext2_rename: lost dir entry");
} else {
/*
* If the source is a directory with a
* new parent, the link count of the old
* parent directory must be decremented
* and ".." set to point to the new parent.
*/
if (doingdirectory && newparent) {
dp->i_nlink--;
dp->i_flag |= IN_CHANGE;
error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
sizeof (struct dirtemplate), (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
tcnp->cn_cred, NOCRED, (int *)0,
(struct thread *)0);
if (error == 0) {
/* Like ufs little-endian: */
namlen = dirbuf.dotdot_type;
if (namlen != 2 ||
dirbuf.dotdot_name[0] != '.' ||
dirbuf.dotdot_name[1] != '.') {
ext2_dirbad(xp, (doff_t)12,
"rename: mangled dir");
} else {
dirbuf.dotdot_ino = newparent;
(void) vn_rdwr(UIO_WRITE, fvp,
(caddr_t)&dirbuf,
sizeof (struct dirtemplate),
(off_t)0, UIO_SYSSPACE,
IO_NODELOCKED | IO_SYNC |
IO_NOMACCHECK, tcnp->cn_cred,
NOCRED, (int *)0,
(struct thread *)0);
cache_purge(fdvp);
}
}
}
error = ext2_dirremove(fdvp, fcnp);
if (!error) {
xp->i_nlink--;
xp->i_flag |= IN_CHANGE;
}
xp->i_flag &= ~IN_RENAME;
}
if (dp)
vput(fdvp);
if (xp)
vput(fvp);
vrele(ap->a_fvp);
return (error);
bad:
if (xp)
vput(ITOV(xp));
vput(ITOV(dp));
out:
if (doingdirectory)
ip->i_flag &= ~IN_RENAME;
if (vn_lock(fvp, LK_EXCLUSIVE, td) == 0) {
ip->i_nlink--;
ip->i_flag |= IN_CHANGE;
ip->i_flag &= ~IN_RENAME;
vput(fvp);
} else
vrele(fvp);
return (error);
}
/*
* Mkdir system call
*/
static int
ext2_mkdir(ap)
struct vop_mkdir_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
struct vnode *dvp = ap->a_dvp;
struct vattr *vap = ap->a_vap;
struct componentname *cnp = ap->a_cnp;
struct inode *ip, *dp;
struct vnode *tvp;
struct dirtemplate dirtemplate, *dtp;
int error, dmode;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ext2_mkdir: no name");
#endif
dp = VTOI(dvp);
if ((nlink_t)dp->i_nlink >= LINK_MAX) {
error = EMLINK;
goto out;
}
dmode = vap->va_mode & 0777;
dmode |= IFDIR;
/*
* Must simulate part of ext2_makeinode here to acquire the inode,
* but not have it entered in the parent directory. The entry is
* made later after writing "." and ".." entries.
*/
error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
if (error)
goto out;
ip = VTOI(tvp);
ip->i_gid = dp->i_gid;
#ifdef SUIDDIR
{
/*
* if we are hacking owners here, (only do this where told to)
* and we are not giving it TOO root, (would subvert quotas)
* then go ahead and give it to the other user.
* The new directory also inherits the SUID bit.
* If user's UID and dir UID are the same,
* 'give it away' so that the SUID is still forced on.
*/
if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
(dp->i_mode & ISUID) && dp->i_uid) {
dmode |= ISUID;
ip->i_uid = dp->i_uid;
} else {
ip->i_uid = cnp->cn_cred->cr_uid;
}
}
#else
ip->i_uid = cnp->cn_cred->cr_uid;
#endif
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_mode = dmode;
tvp->v_type = VDIR; /* Rest init'd in getnewvnode(). */
ip->i_nlink = 2;
if (cnp->cn_flags & ISWHITEOUT)
ip->i_flags |= UF_OPAQUE;
error = ext2_update(tvp, 1);
/*
* Bump link count in parent directory
* to reflect work done below. Should
* be done before reference is created
* so reparation is possible if we crash.
*/
dp->i_nlink++;
dp->i_flag |= IN_CHANGE;
error = ext2_update(dvp, 1);
if (error)
goto bad;
/* Initialize directory with "." and ".." from static template. */
if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs->s_es,
EXT2_FEATURE_INCOMPAT_FILETYPE))
dtp = &mastertemplate;
else
dtp = &omastertemplate;
dirtemplate = *dtp;
dirtemplate.dot_ino = ip->i_number;
dirtemplate.dotdot_ino = dp->i_number;
/* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE
* so let's just redefine it - for this function only
*/
#undef DIRBLKSIZ
#define DIRBLKSIZ VTOI(dvp)->i_e2fs->s_blocksize
dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
(int *)0, (struct thread *)0);
if (error) {
dp->i_nlink--;
dp->i_flag |= IN_CHANGE;
goto bad;
}
if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
/* XXX should grow with balloc() */
panic("ext2_mkdir: blksize");
else {
ip->i_size = DIRBLKSIZ;
ip->i_flag |= IN_CHANGE;
}
/* Directory set up, now install its entry in the parent directory. */
error = ext2_direnter(ip, dvp, cnp);
if (error) {
dp->i_nlink--;
dp->i_flag |= IN_CHANGE;
}
bad:
/*
* No need to do an explicit VOP_TRUNCATE here, vrele will do this
* for us because we set the link count to 0.
*/
if (error) {
ip->i_nlink = 0;
ip->i_flag |= IN_CHANGE;
vput(tvp);
} else
*ap->a_vpp = tvp;
out:
return (error);
#undef DIRBLKSIZ
#define DIRBLKSIZ DEV_BSIZE
}
/*
* Rmdir system call.
*/
static int
ext2_rmdir(ap)
struct vop_rmdir_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct componentname *cnp = ap->a_cnp;
struct thread *td = cnp->cn_thread;
struct inode *ip, *dp;
int error;
ip = VTOI(vp);
dp = VTOI(dvp);
/*
* Verify the directory is empty (and valid).
* (Rmdir ".." won't be valid since
* ".." will contain a reference to
* the current directory and thus be
* non-empty.)
*/
error = 0;
if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
error = ENOTEMPTY;
goto out;
}
if ((dp->i_flags & APPEND)
|| (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
error = EPERM;
goto out;
}
/*
* Delete reference to directory before purging
* inode. If we crash in between, the directory
* will be reattached to lost+found,
*/
error = ext2_dirremove(dvp, cnp);
if (error)
goto out;
dp->i_nlink--;
dp->i_flag |= IN_CHANGE;
cache_purge(dvp);
VOP_UNLOCK(dvp, 0, td);
/*
* Truncate inode. The only stuff left
* in the directory is "." and "..". The
* "." reference is inconsequential since
* we're quashing it. The ".." reference
* has already been adjusted above. We've
* removed the "." reference and the reference
* in the parent directory, but there may be
* other hard links so decrement by 2 and
* worry about them later.
*/
ip->i_nlink -= 2;
error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred, td);
cache_purge(ITOV(ip));
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY, td);
out:
return (error);
}
/*
* symlink -- make a symbolic link
*/
static int
ext2_symlink(ap)
struct vop_symlink_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
} */ *ap;
{
struct vnode *vp, **vpp = ap->a_vpp;
struct inode *ip;
int len, error;
error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
vpp, ap->a_cnp);
if (error)
return (error);
vp = *vpp;
len = strlen(ap->a_target);
if (len < vp->v_mount->mnt_maxsymlinklen) {
ip = VTOI(vp);
bcopy(ap->a_target, (char *)ip->i_shortlink, len);
ip->i_size = len;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
} else
error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
ap->a_cnp->cn_cred, NOCRED, (int *)0, (struct thread *)0);
if (error)
vput(vp);
return (error);
}
/*
* Return target name of a symbolic link
*/
static int
ext2_readlink(ap)
struct vop_readlink_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
int isize;
isize = ip->i_size;
if (isize < vp->v_mount->mnt_maxsymlinklen) {
uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
return (0);
}
return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
}
/*
* Calculate the logical to physical mapping if not done already,
* then call the device strategy routine.
*
* In order to be able to swap to a file, the ext2_bmaparray() operation may not
* deadlock on memory. See ext2_bmap() for details.
*/
static int
ext2_strategy(ap)
struct vop_strategy_args /* {
struct vnode *a_vp;
struct buf *a_bp;
} */ *ap;
{
struct buf *bp = ap->a_bp;
struct vnode *vp = ap->a_vp;
struct inode *ip;
struct bufobj *bo;
int32_t blkno;
int error;
ip = VTOI(vp);
if (vp->v_type == VBLK || vp->v_type == VCHR)
panic("ext2_strategy: spec");
if (bp->b_blkno == bp->b_lblkno) {
error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
bp->b_blkno = blkno;
if (error) {
bp->b_error = error;
bp->b_ioflags |= BIO_ERROR;
bufdone(bp);
return (error);
}
if ((long)bp->b_blkno == -1)
vfs_bio_clrbuf(bp);
}
if ((long)bp->b_blkno == -1) {
bufdone(bp);
return (0);
}
bp->b_iooffset = dbtob(bp->b_blkno);
bo = VFSTOEXT2(vp->v_mount)->um_bo;
bo->bo_ops->bop_strategy(bo, bp);
return (0);
}
/*
* Print out the contents of an inode.
*/
static int
ext2_print(ap)
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
printf("\tino %lu, on dev %s (%d, %d)", (u_long)ip->i_number,
devtoname(ip->i_dev), major(ip->i_dev), minor(ip->i_dev));
if (vp->v_type == VFIFO)
fifo_printinfo(vp);
printf("\n");
return (0);
}
/*
* Read wrapper for fifos.
*/
static int
ext2fifo_read(ap)
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
int error, resid;
struct inode *ip;
struct uio *uio;
uio = ap->a_uio;
resid = uio->uio_resid;
error = fifo_specops.vop_read(ap);
ip = VTOI(ap->a_vp);
if ((ap->a_vp->v_mount->mnt_flag & MNT_NOATIME) == 0 && ip != NULL &&
(uio->uio_resid != resid || (error == 0 && resid != 0)))
VTOI(ap->a_vp)->i_flag |= IN_ACCESS;
return (error);
}
/*
* Write wrapper for fifos.
*/
static int
ext2fifo_write(ap)
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
int error, resid;
struct inode *ip;
struct uio *uio;
uio = ap->a_uio;
resid = uio->uio_resid;
error = fifo_specops.vop_write(ap);
ip = VTOI(ap->a_vp);
if (ip != NULL && (uio->uio_resid != resid || (error == 0 && resid != 0)))
VTOI(ap->a_vp)->i_flag |= IN_CHANGE | IN_UPDATE;
return (error);
}
/*
* Close wrapper for fifos.
*
* Update the times on the inode then do device close.
*/
static int
ext2fifo_close(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
VI_LOCK(vp);
if (vp->v_usecount > 1)
ext2_itimes(vp);
VI_UNLOCK(vp);
return (fifo_specops.vop_close(ap));
}
/*
* Kqfilter wrapper for fifos.
*
* Fall through to ext2 kqfilter routines if needed
*/
static int
ext2fifo_kqfilter(ap)
struct vop_kqfilter_args *ap;
{
int error;
error = fifo_specops.vop_kqfilter(ap);
if (error)
error = ext2_kqfilter(ap);
return (error);
}
/*
* Return POSIX pathconf information applicable to ext2 filesystems.
*/
static int
ext2_pathconf(ap)
struct vop_pathconf_args /* {
struct vnode *a_vp;
int a_name;
int *a_retval;
} */ *ap;
{
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = LINK_MAX;
return (0);
case _PC_NAME_MAX:
*ap->a_retval = NAME_MAX;
return (0);
case _PC_PATH_MAX:
*ap->a_retval = PATH_MAX;
return (0);
case _PC_PIPE_BUF:
*ap->a_retval = PIPE_BUF;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_NO_TRUNC:
*ap->a_retval = 1;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Advisory record locking support
*/
static int
ext2_advlock(ap)
struct vop_advlock_args /* {
struct vnode *a_vp;
caddr_t a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */ *ap;
{
struct inode *ip = VTOI(ap->a_vp);
return (lf_advlock(ap, &(ip->i_lockf), ip->i_size));
}
/*
* Initialize the vnode associated with a new inode, handle aliased
* vnodes.
*/
int
ext2_vinit(mntp, fifoops, vpp)
struct mount *mntp;
struct vop_vector *fifoops;
struct vnode **vpp;
{
struct inode *ip;
struct vnode *vp;
vp = *vpp;
ip = VTOI(vp);
vp->v_type = IFTOVT(ip->i_mode);
if (vp->v_type == VFIFO)
vp->v_op = fifoops;
if (ip->i_number == ROOTINO)
vp->v_vflag |= VV_ROOT;
ip->i_modrev = init_va_filerev();
*vpp = vp;
return (0);
}
/*
* Allocate a new inode.
*/
static int
ext2_makeinode(mode, dvp, vpp, cnp)
int mode;
struct vnode *dvp;
struct vnode **vpp;
struct componentname *cnp;
{
struct inode *ip, *pdir;
struct vnode *tvp;
int error;
pdir = VTOI(dvp);
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ext2_makeinode: no name");
#endif
*vpp = NULL;
if ((mode & IFMT) == 0)
mode |= IFREG;
error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
if (error) {
return (error);
}
ip = VTOI(tvp);
ip->i_gid = pdir->i_gid;
#ifdef SUIDDIR
{
/*
* if we are
* not the owner of the directory,
* and we are hacking owners here, (only do this where told to)
* and we are not giving it TOO root, (would subvert quotas)
* then go ahead and give it to the other user.
* Note that this drops off the execute bits for security.
*/
if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
(pdir->i_mode & ISUID) &&
(pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
ip->i_uid = pdir->i_uid;
mode &= ~07111;
} else {
ip->i_uid = cnp->cn_cred->cr_uid;
}
}
#else
ip->i_uid = cnp->cn_cred->cr_uid;
#endif
ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
ip->i_mode = mode;
tvp->v_type = IFTOVT(mode); /* Rest init'd in getnewvnode(). */
ip->i_nlink = 1;
if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
suser_cred(cnp->cn_cred, SUSER_ALLOWJAIL))
ip->i_mode &= ~ISGID;
if (cnp->cn_flags & ISWHITEOUT)
ip->i_flags |= UF_OPAQUE;
/*
* Make sure inode goes to disk before directory entry.
*/
error = ext2_update(tvp, 1);
if (error)
goto bad;
error = ext2_direnter(ip, dvp, cnp);
if (error)
goto bad;
*vpp = tvp;
return (0);
bad:
/*
* Write error occurred trying to update the inode
* or the directory so must deallocate the inode.
*/
ip->i_nlink = 0;
ip->i_flag |= IN_CHANGE;
vput(tvp);
return (error);
}
static struct filterops ext2read_filtops =
{ 1, NULL, filt_ext2detach, filt_ext2read };
static struct filterops ext2write_filtops =
{ 1, NULL, filt_ext2detach, filt_ext2write };
static struct filterops ext2vnode_filtops =
{ 1, NULL, filt_ext2detach, filt_ext2vnode };
static int
ext2_kqfilter(ap)
struct vop_kqfilter_args /* {
struct vnode *a_vp;
struct knote *a_kn;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct knote *kn = ap->a_kn;
switch (kn->kn_filter) {
case EVFILT_READ:
kn->kn_fop = &ext2read_filtops;
break;
case EVFILT_WRITE:
kn->kn_fop = &ext2write_filtops;
break;
case EVFILT_VNODE:
kn->kn_fop = &ext2vnode_filtops;
break;
default:
return (1);
}
kn->kn_hook = (caddr_t)vp;
if (vp->v_pollinfo == NULL)
v_addpollinfo(vp);
if (vp->v_pollinfo == NULL)
return ENOMEM;
knlist_add(&vp->v_pollinfo->vpi_selinfo.si_note, kn, 0);
return (0);
}
static void
filt_ext2detach(struct knote *kn)
{
struct vnode *vp = (struct vnode *)kn->kn_hook;
KASSERT(vp->v_pollinfo != NULL, ("Mising v_pollinfo"));
knlist_remove(&vp->v_pollinfo->vpi_selinfo.si_note, kn, 0);
}
/*ARGSUSED*/
static int
filt_ext2read(struct knote *kn, long hint)
{
struct vnode *vp = (struct vnode *)kn->kn_hook;
struct inode *ip = VTOI(vp);
/*
* filesystem is gone, so set the EOF flag and schedule
* the knote for deletion.
*/
if (hint == NOTE_REVOKE) {
kn->kn_flags |= (EV_EOF | EV_ONESHOT);
return (1);
}
kn->kn_data = ip->i_size - kn->kn_fp->f_offset;
return (kn->kn_data != 0);
}
/*ARGSUSED*/
static int
filt_ext2write(struct knote *kn, long hint)
{
/*
* filesystem is gone, so set the EOF flag and schedule
* the knote for deletion.
*/
if (hint == NOTE_REVOKE)
kn->kn_flags |= (EV_EOF | EV_ONESHOT);
kn->kn_data = 0;
return (1);
}
static int
filt_ext2vnode(struct knote *kn, long hint)
{
if (kn->kn_sfflags & hint)
kn->kn_fflags |= hint;
if (hint == NOTE_REVOKE) {
kn->kn_flags |= EV_EOF;
return (1);
}
return (kn->kn_fflags != 0);
}
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