1d0fce9bfe
Literally copy/pasted from ffs_getpages(). Tested with: fsx MFC after: 2 months
2106 lines
52 KiB
C
2106 lines
52 KiB
C
/*-
|
|
* 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/kernel.h>
|
|
#include <sys/fcntl.h>
|
|
#include <sys/filio.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/bio.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/endian.h>
|
|
#include <sys/priv.h>
|
|
#include <sys/rwlock.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_param.h>
|
|
#include <vm/vm_extern.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_pager.h>
|
|
#include <vm/vnode_pager.h>
|
|
|
|
#include "opt_directio.h"
|
|
|
|
#include <ufs/ufs/dir.h>
|
|
|
|
#include <fs/ext2fs/fs.h>
|
|
#include <fs/ext2fs/inode.h>
|
|
#include <fs/ext2fs/ext2_extern.h>
|
|
#include <fs/ext2fs/ext2fs.h>
|
|
#include <fs/ext2fs/ext2_dinode.h>
|
|
#include <fs/ext2fs/ext2_dir.h>
|
|
#include <fs/ext2fs/ext2_mount.h>
|
|
|
|
static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
|
|
static void ext2_itimes_locked(struct vnode *);
|
|
static int ext4_ext_read(struct vop_read_args *);
|
|
static int ext2_ind_read(struct vop_read_args *);
|
|
|
|
static vop_access_t ext2_access;
|
|
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_getpages_t ext2_getpages;
|
|
static vop_getattr_t ext2_getattr;
|
|
static vop_ioctl_t ext2_ioctl;
|
|
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_vptofh_t ext2_vptofh;
|
|
static vop_close_t ext2fifo_close;
|
|
static vop_kqfilter_t ext2fifo_kqfilter;
|
|
|
|
/* Global vfs data structures for ext2. */
|
|
struct vop_vector ext2_vnodeops = {
|
|
.vop_default = &default_vnodeops,
|
|
.vop_access = ext2_access,
|
|
.vop_bmap = ext2_bmap,
|
|
.vop_cachedlookup = ext2_lookup,
|
|
.vop_close = ext2_close,
|
|
.vop_create = ext2_create,
|
|
.vop_fsync = ext2_fsync,
|
|
.vop_getpages = ext2_getpages,
|
|
.vop_getattr = ext2_getattr,
|
|
.vop_inactive = ext2_inactive,
|
|
.vop_ioctl = ext2_ioctl,
|
|
.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_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,
|
|
.vop_vptofh = ext2_vptofh,
|
|
};
|
|
|
|
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 = VOP_PANIC,
|
|
.vop_reclaim = ext2_reclaim,
|
|
.vop_setattr = ext2_setattr,
|
|
.vop_write = VOP_PANIC,
|
|
.vop_vptofh = ext2_vptofh,
|
|
};
|
|
|
|
/*
|
|
* 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, ".."
|
|
};
|
|
|
|
static void
|
|
ext2_itimes_locked(struct vnode *vp)
|
|
{
|
|
struct inode *ip;
|
|
struct timespec ts;
|
|
|
|
ASSERT_VI_LOCKED(vp, __func__);
|
|
|
|
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);
|
|
}
|
|
|
|
void
|
|
ext2_itimes(struct vnode *vp)
|
|
{
|
|
|
|
VI_LOCK(vp);
|
|
ext2_itimes_locked(vp);
|
|
VI_UNLOCK(vp);
|
|
}
|
|
|
|
/*
|
|
* Create a regular file
|
|
*/
|
|
static int
|
|
ext2_create(struct vop_create_args *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);
|
|
}
|
|
|
|
static int
|
|
ext2_open(struct vop_open_args *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);
|
|
|
|
vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Close called.
|
|
*
|
|
* Update the times on the inode.
|
|
*/
|
|
static int
|
|
ext2_close(struct vop_close_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
VI_LOCK(vp);
|
|
if (vp->v_usecount > 1)
|
|
ext2_itimes_locked(vp);
|
|
VI_UNLOCK(vp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ext2_access(struct vop_access_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct inode *ip = VTOI(vp);
|
|
accmode_t accmode = ap->a_accmode;
|
|
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 (accmode & 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 ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
|
|
return (EPERM);
|
|
|
|
error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
|
|
ap->a_accmode, ap->a_cred, NULL);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ext2_getattr(struct vop_getattr_args *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_devvp->v_rdev);
|
|
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 = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
|
|
vap->va_mtime.tv_sec = ip->i_mtime;
|
|
vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
|
|
vap->va_ctime.tv_sec = ip->i_ctime;
|
|
vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
|
|
if E2DI_HAS_XTIME(ip) {
|
|
vap->va_birthtime.tv_sec = ip->i_birthtime;
|
|
vap->va_birthtime.tv_nsec = ip->i_birthnsec;
|
|
}
|
|
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(struct vop_setattr_args *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 = curthread;
|
|
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) {
|
|
/* Disallow flags not supported by ext2fs. */
|
|
if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
|
|
return (EOPNOTSUPP);
|
|
|
|
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 (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
|
|
if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
|
|
error = securelevel_gt(cred, 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
} else {
|
|
if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
|
|
((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
|
|
return (EPERM);
|
|
}
|
|
ip->i_flags = vap->va_flags;
|
|
ip->i_flag |= IN_CHANGE;
|
|
if (ip->i_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;
|
|
}
|
|
ip->i_birthtime = vap->va_birthtime.tv_sec;
|
|
ip->i_birthnsec = vap->va_birthtime.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);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Change the mode on a file.
|
|
* Inode must be locked before calling.
|
|
*/
|
|
static int
|
|
ext2_chmod(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 (vp->v_type != VDIR && (mode & S_ISTXT)) {
|
|
error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0);
|
|
if (error)
|
|
return (EFTYPE);
|
|
}
|
|
if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
|
|
error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
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(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 = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
ogid = ip->i_gid;
|
|
ouid = ip->i_uid;
|
|
ip->i_gid = gid;
|
|
ip->i_uid = uid;
|
|
ip->i_flag |= IN_CHANGE;
|
|
if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
|
|
if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0)
|
|
ip->i_mode &= ~(ISUID | ISGID);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Synch an open file.
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
ext2_fsync(struct vop_fsync_args *ap)
|
|
{
|
|
/*
|
|
* Flush all dirty buffers associated with a vnode.
|
|
*/
|
|
|
|
vop_stdfsync(ap);
|
|
|
|
return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
|
|
}
|
|
|
|
/*
|
|
* Mknod vnode call
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
ext2_mknod(struct vop_mknod_args *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. XXX I don't believe this is necessary now.
|
|
*/
|
|
(*vpp)->v_type = VNON;
|
|
ino = ip->i_number; /* Save this before vgone() invalidates ip. */
|
|
vgone(*vpp);
|
|
vput(*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(struct vop_remove_args *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(struct vop_link_args *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 INVARIANTS
|
|
if ((cnp->cn_flags & HASBUF) == 0)
|
|
panic("ext2_link: no name");
|
|
#endif
|
|
ip = VTOI(vp);
|
|
if ((nlink_t)ip->i_nlink >= EXT2_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, !DOINGASYNC(vp));
|
|
if (!error)
|
|
error = ext2_direnter(ip, tdvp, cnp);
|
|
if (error) {
|
|
ip->i_nlink--;
|
|
ip->i_flag |= IN_CHANGE;
|
|
}
|
|
out:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Rename system call.
|
|
* rename("foo", "bar");
|
|
* is essentially
|
|
* unlink("bar");
|
|
* link("foo", "bar");
|
|
* unlink("foo");
|
|
* but ``atomically''. Can't do full commit without saving state in the
|
|
* inode on disk which isn't feasible at this time. Best we can do is
|
|
* always guarantee the target exists.
|
|
*
|
|
* Basic algorithm is:
|
|
*
|
|
* 1) Bump link count on source while we're linking it to the
|
|
* target. This also ensure the inode won't be deleted out
|
|
* from underneath us while we work (it may be truncated by
|
|
* a concurrent `trunc' or `open' for creation).
|
|
* 2) Link source to destination. If destination already exists,
|
|
* delete it first.
|
|
* 3) Unlink source reference to inode if still around. If a
|
|
* directory was moved and the parent of the destination
|
|
* is different from the source, patch the ".." entry in the
|
|
* directory.
|
|
*/
|
|
static int
|
|
ext2_rename(struct vop_rename_args *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 inode *ip, *xp, *dp;
|
|
struct dirtemplate dirbuf;
|
|
int doingdirectory = 0, oldparent = 0, newparent = 0;
|
|
int error = 0;
|
|
u_char namlen;
|
|
|
|
#ifdef INVARIANTS
|
|
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)) != 0)
|
|
goto abortit;
|
|
dp = VTOI(fdvp);
|
|
ip = VTOI(fvp);
|
|
if (ip->i_nlink >= EXT2_LINK_MAX) {
|
|
VOP_UNLOCK(fvp, 0);
|
|
error = EMLINK;
|
|
goto abortit;
|
|
}
|
|
if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
|
|
|| (dp->i_flags & APPEND)) {
|
|
VOP_UNLOCK(fvp, 0);
|
|
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);
|
|
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, !DOINGASYNC(fvp))) != 0) {
|
|
VOP_UNLOCK(fvp, 0);
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* If ".." must be changed (ie the directory gets a new
|
|
* parent) then the source directory must not be in the
|
|
* directory hierarchy 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);
|
|
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_devvp != ip->i_devvp)
|
|
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 >= EXT2_LINK_MAX) {
|
|
error = EMLINK;
|
|
goto bad;
|
|
}
|
|
dp->i_nlink++;
|
|
dp->i_flag |= IN_CHANGE;
|
|
error = ext2_update(tdvp, !DOINGASYNC(tdvp));
|
|
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_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
|
|
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, NULL, NULL);
|
|
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, NULL, NULL);
|
|
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) == 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(struct vop_mkdir_args *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 INVARIANTS
|
|
if ((cnp->cn_flags & HASBUF) == 0)
|
|
panic("ext2_mkdir: no name");
|
|
#endif
|
|
dp = VTOI(dvp);
|
|
if ((nlink_t)dp->i_nlink >= EXT2_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, !DOINGASYNC(dvp));
|
|
if (error)
|
|
goto bad;
|
|
|
|
/* Initialize directory with "." and ".." from static template. */
|
|
if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
|
|
EXT2F_INCOMPAT_FTYPE))
|
|
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->e2fs_bsize
|
|
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,
|
|
NULL, NULL);
|
|
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(struct vop_rmdir_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct vnode *dvp = ap->a_dvp;
|
|
struct componentname *cnp = ap->a_cnp;
|
|
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);
|
|
/*
|
|
* 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,
|
|
cnp->cn_thread);
|
|
cache_purge(ITOV(ip));
|
|
if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
|
|
VOP_UNLOCK(vp, 0);
|
|
vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
|
|
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
|
|
}
|
|
out:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* symlink -- make a symbolic link
|
|
*/
|
|
static int
|
|
ext2_symlink(struct vop_symlink_args *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, NULL, NULL);
|
|
if (error)
|
|
vput(vp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return target name of a symbolic link
|
|
*/
|
|
static int
|
|
ext2_readlink(struct vop_readlink_args *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(struct vop_strategy_args *ap)
|
|
{
|
|
struct buf *bp = ap->a_bp;
|
|
struct vnode *vp = ap->a_vp;
|
|
struct inode *ip;
|
|
struct bufobj *bo;
|
|
daddr_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 (0);
|
|
}
|
|
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_STRATEGY(bo, bp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Print out the contents of an inode.
|
|
*/
|
|
static int
|
|
ext2_print(struct vop_print_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
struct inode *ip = VTOI(vp);
|
|
|
|
vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number);
|
|
if (vp->v_type == VFIFO)
|
|
fifo_printinfo(vp);
|
|
printf("\n");
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Close wrapper for fifos.
|
|
*
|
|
* Update the times on the inode then do device close.
|
|
*/
|
|
static int
|
|
ext2fifo_close(struct vop_close_args *ap)
|
|
{
|
|
struct vnode *vp = ap->a_vp;
|
|
|
|
VI_LOCK(vp);
|
|
if (vp->v_usecount > 1)
|
|
ext2_itimes_locked(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(struct vop_kqfilter_args *ap)
|
|
{
|
|
int error;
|
|
|
|
error = fifo_specops.vop_kqfilter(ap);
|
|
if (error)
|
|
error = vfs_kqfilter(ap);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Return POSIX pathconf information applicable to ext2 filesystems.
|
|
*/
|
|
static int
|
|
ext2_pathconf(struct vop_pathconf_args *ap)
|
|
{
|
|
int error = 0;
|
|
|
|
switch (ap->a_name) {
|
|
case _PC_LINK_MAX:
|
|
*ap->a_retval = EXT2_LINK_MAX;
|
|
break;
|
|
case _PC_NAME_MAX:
|
|
*ap->a_retval = NAME_MAX;
|
|
break;
|
|
case _PC_PATH_MAX:
|
|
*ap->a_retval = PATH_MAX;
|
|
break;
|
|
case _PC_PIPE_BUF:
|
|
*ap->a_retval = PIPE_BUF;
|
|
break;
|
|
case _PC_CHOWN_RESTRICTED:
|
|
*ap->a_retval = 1;
|
|
break;
|
|
case _PC_NO_TRUNC:
|
|
*ap->a_retval = 1;
|
|
break;
|
|
case _PC_MIN_HOLE_SIZE:
|
|
*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
|
|
break;
|
|
case _PC_ASYNC_IO:
|
|
/* _PC_ASYNC_IO should have been handled by upper layers. */
|
|
KASSERT(0, ("_PC_ASYNC_IO should not get here"));
|
|
error = EINVAL;
|
|
break;
|
|
case _PC_PRIO_IO:
|
|
*ap->a_retval = 0;
|
|
break;
|
|
case _PC_SYNC_IO:
|
|
*ap->a_retval = 0;
|
|
break;
|
|
case _PC_ALLOC_SIZE_MIN:
|
|
*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
|
|
break;
|
|
case _PC_FILESIZEBITS:
|
|
*ap->a_retval = 64;
|
|
break;
|
|
case _PC_REC_INCR_XFER_SIZE:
|
|
*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
|
|
break;
|
|
case _PC_REC_MAX_XFER_SIZE:
|
|
*ap->a_retval = -1; /* means ``unlimited'' */
|
|
break;
|
|
case _PC_REC_MIN_XFER_SIZE:
|
|
*ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
|
|
break;
|
|
case _PC_REC_XFER_ALIGN:
|
|
*ap->a_retval = PAGE_SIZE;
|
|
break;
|
|
case _PC_SYMLINK_MAX:
|
|
*ap->a_retval = MAXPATHLEN;
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Vnode pointer to File handle
|
|
*/
|
|
/* ARGSUSED */
|
|
static int
|
|
ext2_vptofh(struct vop_vptofh_args *ap)
|
|
{
|
|
struct inode *ip;
|
|
struct ufid *ufhp;
|
|
|
|
ip = VTOI(ap->a_vp);
|
|
ufhp = (struct ufid *)ap->a_fhp;
|
|
ufhp->ufid_len = sizeof(struct ufid);
|
|
ufhp->ufid_ino = ip->i_number;
|
|
ufhp->ufid_gen = ip->i_gen;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Initialize the vnode associated with a new inode, handle aliased
|
|
* vnodes.
|
|
*/
|
|
int
|
|
ext2_vinit(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 == EXT2_ROOTINO)
|
|
vp->v_vflag |= VV_ROOT;
|
|
ip->i_modrev = init_va_filerev();
|
|
*vpp = vp;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Allocate a new inode.
|
|
*/
|
|
static int
|
|
ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
|
|
struct componentname *cnp)
|
|
{
|
|
struct inode *ip, *pdir;
|
|
struct vnode *tvp;
|
|
int error;
|
|
|
|
pdir = VTOI(dvp);
|
|
#ifdef INVARIANTS
|
|
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)) {
|
|
if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0))
|
|
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, !DOINGASYNC(tvp));
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for reading.
|
|
*/
|
|
static int
|
|
ext2_read(struct vop_read_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct inode *ip;
|
|
int error;
|
|
|
|
vp = ap->a_vp;
|
|
ip = VTOI(vp);
|
|
|
|
/*EXT4_EXT_LOCK(ip);*/
|
|
if (ip->i_flag & IN_E4EXTENTS)
|
|
error = ext4_ext_read(ap);
|
|
else
|
|
error = ext2_ind_read(ap);
|
|
/*EXT4_EXT_UNLOCK(ip);*/
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for reading.
|
|
*/
|
|
static int
|
|
ext2_ind_read(struct vop_read_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct inode *ip;
|
|
struct uio *uio;
|
|
struct m_ext2fs *fs;
|
|
struct buf *bp;
|
|
daddr_t lbn, nextlbn;
|
|
off_t bytesinfile;
|
|
long size, xfersize, blkoffset;
|
|
int error, orig_resid, seqcount;
|
|
int ioflag;
|
|
|
|
vp = ap->a_vp;
|
|
uio = ap->a_uio;
|
|
ioflag = ap->a_ioflag;
|
|
|
|
seqcount = ap->a_ioflag >> IO_SEQSHIFT;
|
|
ip = VTOI(vp);
|
|
|
|
#ifdef INVARIANTS
|
|
if (uio->uio_rw != UIO_READ)
|
|
panic("%s: mode", "ext2_read");
|
|
|
|
if (vp->v_type == VLNK) {
|
|
if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
|
|
panic("%s: short symlink", "ext2_read");
|
|
} else if (vp->v_type != VREG && vp->v_type != VDIR)
|
|
panic("%s: type %d", "ext2_read", vp->v_type);
|
|
#endif
|
|
orig_resid = uio->uio_resid;
|
|
KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
|
|
if (orig_resid == 0)
|
|
return (0);
|
|
KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
|
|
fs = ip->i_e2fs;
|
|
if (uio->uio_offset < ip->i_size &&
|
|
uio->uio_offset >= fs->e2fs_maxfilesize)
|
|
return (EOVERFLOW);
|
|
|
|
for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
|
|
if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
|
|
break;
|
|
lbn = lblkno(fs, uio->uio_offset);
|
|
nextlbn = lbn + 1;
|
|
size = blksize(fs, ip, lbn);
|
|
blkoffset = blkoff(fs, uio->uio_offset);
|
|
|
|
xfersize = fs->e2fs_fsize - blkoffset;
|
|
if (uio->uio_resid < xfersize)
|
|
xfersize = uio->uio_resid;
|
|
if (bytesinfile < xfersize)
|
|
xfersize = bytesinfile;
|
|
|
|
if (lblktosize(fs, nextlbn) >= ip->i_size)
|
|
error = bread(vp, lbn, size, NOCRED, &bp);
|
|
else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
|
|
error = cluster_read(vp, ip->i_size, lbn, size,
|
|
NOCRED, blkoffset + uio->uio_resid, seqcount,
|
|
0, &bp);
|
|
} else if (seqcount > 1) {
|
|
u_int nextsize = blksize(fs, ip, nextlbn);
|
|
error = breadn(vp, lbn,
|
|
size, &nextlbn, &nextsize, 1, NOCRED, &bp);
|
|
} else
|
|
error = bread(vp, lbn, size, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
bp = NULL;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If IO_DIRECT then set B_DIRECT for the buffer. This
|
|
* will cause us to attempt to release the buffer later on
|
|
* and will cause the buffer cache to attempt to free the
|
|
* underlying pages.
|
|
*/
|
|
if (ioflag & IO_DIRECT)
|
|
bp->b_flags |= B_DIRECT;
|
|
|
|
/*
|
|
* We should only get non-zero b_resid when an I/O error
|
|
* has occurred, which should cause us to break above.
|
|
* However, if the short read did not cause an error,
|
|
* then we want to ensure that we do not uiomove bad
|
|
* or uninitialized data.
|
|
*/
|
|
size -= bp->b_resid;
|
|
if (size < xfersize) {
|
|
if (size == 0)
|
|
break;
|
|
xfersize = size;
|
|
}
|
|
error = uiomove((char *)bp->b_data + blkoffset,
|
|
(int)xfersize, uio);
|
|
if (error)
|
|
break;
|
|
|
|
if (ioflag & (IO_VMIO|IO_DIRECT)) {
|
|
/*
|
|
* If it's VMIO or direct I/O, then we don't
|
|
* need the buf, mark it available for
|
|
* freeing. If it's non-direct VMIO, the VM has
|
|
* the data.
|
|
*/
|
|
bp->b_flags |= B_RELBUF;
|
|
brelse(bp);
|
|
} else {
|
|
/*
|
|
* Otherwise let whoever
|
|
* made the request take care of
|
|
* freeing it. We just queue
|
|
* it onto another list.
|
|
*/
|
|
bqrelse(bp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This can only happen in the case of an error
|
|
* because the loop above resets bp to NULL on each iteration
|
|
* and on normal completion has not set a new value into it.
|
|
* so it must have come from a 'break' statement
|
|
*/
|
|
if (bp != NULL) {
|
|
if (ioflag & (IO_VMIO|IO_DIRECT)) {
|
|
bp->b_flags |= B_RELBUF;
|
|
brelse(bp);
|
|
} else {
|
|
bqrelse(bp);
|
|
}
|
|
}
|
|
|
|
if ((error == 0 || uio->uio_resid != orig_resid) &&
|
|
(vp->v_mount->mnt_flag & MNT_NOATIME) == 0)
|
|
ip->i_flag |= IN_ACCESS;
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ext2_ioctl(struct vop_ioctl_args *ap)
|
|
{
|
|
|
|
switch (ap->a_command) {
|
|
case FIOSEEKDATA:
|
|
case FIOSEEKHOLE:
|
|
return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
|
|
(off_t *)ap->a_data, ap->a_cred));
|
|
default:
|
|
return (ENOTTY);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* this function handles ext4 extents block mapping
|
|
*/
|
|
static int
|
|
ext4_ext_read(struct vop_read_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct inode *ip;
|
|
struct uio *uio;
|
|
struct m_ext2fs *fs;
|
|
struct buf *bp;
|
|
struct ext4_extent nex, *ep;
|
|
struct ext4_extent_path path;
|
|
daddr_t lbn, newblk;
|
|
off_t bytesinfile;
|
|
int cache_type;
|
|
ssize_t orig_resid;
|
|
int error;
|
|
long size, xfersize, blkoffset;
|
|
|
|
vp = ap->a_vp;
|
|
ip = VTOI(vp);
|
|
uio = ap->a_uio;
|
|
memset(&path, 0, sizeof(path));
|
|
|
|
orig_resid = uio->uio_resid;
|
|
KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__));
|
|
if (orig_resid == 0)
|
|
return (0);
|
|
KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__));
|
|
fs = ip->i_e2fs;
|
|
if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize)
|
|
return (EOVERFLOW);
|
|
|
|
while (uio->uio_resid > 0) {
|
|
if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
|
|
break;
|
|
lbn = lblkno(fs, uio->uio_offset);
|
|
size = blksize(fs, ip, lbn);
|
|
blkoffset = blkoff(fs, uio->uio_offset);
|
|
|
|
xfersize = fs->e2fs_fsize - blkoffset;
|
|
xfersize = MIN(xfersize, uio->uio_resid);
|
|
xfersize = MIN(xfersize, bytesinfile);
|
|
|
|
/* get block from ext4 extent cache */
|
|
cache_type = ext4_ext_in_cache(ip, lbn, &nex);
|
|
switch (cache_type) {
|
|
case EXT4_EXT_CACHE_NO:
|
|
ext4_ext_find_extent(fs, ip, lbn, &path);
|
|
ep = path.ep_ext;
|
|
if (ep == NULL)
|
|
return (EIO);
|
|
|
|
ext4_ext_put_cache(ip, ep, EXT4_EXT_CACHE_IN);
|
|
|
|
newblk = lbn - ep->e_blk + (ep->e_start_lo |
|
|
(daddr_t)ep->e_start_hi << 32);
|
|
|
|
if (path.ep_bp != NULL) {
|
|
brelse(path.ep_bp);
|
|
path.ep_bp = NULL;
|
|
}
|
|
break;
|
|
|
|
case EXT4_EXT_CACHE_GAP:
|
|
/* block has not been allocated yet */
|
|
return (0);
|
|
|
|
case EXT4_EXT_CACHE_IN:
|
|
newblk = lbn - nex.e_blk + (nex.e_start_lo |
|
|
(daddr_t)nex.e_start_hi << 32);
|
|
break;
|
|
|
|
default:
|
|
panic("%s: invalid cache type", __func__);
|
|
}
|
|
|
|
error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
|
|
size -= bp->b_resid;
|
|
if (size < xfersize) {
|
|
if (size == 0) {
|
|
bqrelse(bp);
|
|
break;
|
|
}
|
|
xfersize = size;
|
|
}
|
|
error = uiomove(bp->b_data + blkoffset, (int)xfersize, uio);
|
|
bqrelse(bp);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Vnode op for writing.
|
|
*/
|
|
static int
|
|
ext2_write(struct vop_write_args *ap)
|
|
{
|
|
struct vnode *vp;
|
|
struct uio *uio;
|
|
struct inode *ip;
|
|
struct m_ext2fs *fs;
|
|
struct buf *bp;
|
|
daddr_t lbn;
|
|
off_t osize;
|
|
int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
|
|
|
|
ioflag = ap->a_ioflag;
|
|
uio = ap->a_uio;
|
|
vp = ap->a_vp;
|
|
|
|
seqcount = ioflag >> IO_SEQSHIFT;
|
|
ip = VTOI(vp);
|
|
|
|
#ifdef INVARIANTS
|
|
if (uio->uio_rw != UIO_WRITE)
|
|
panic("%s: mode", "ext2_write");
|
|
#endif
|
|
|
|
switch (vp->v_type) {
|
|
case VREG:
|
|
if (ioflag & IO_APPEND)
|
|
uio->uio_offset = ip->i_size;
|
|
if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
|
|
return (EPERM);
|
|
/* FALLTHROUGH */
|
|
case VLNK:
|
|
break;
|
|
case VDIR:
|
|
/* XXX differs from ffs -- this is called from ext2_mkdir(). */
|
|
if ((ioflag & IO_SYNC) == 0)
|
|
panic("ext2_write: nonsync dir write");
|
|
break;
|
|
default:
|
|
panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
|
|
vp->v_type, (intmax_t)uio->uio_offset,
|
|
(intmax_t)uio->uio_resid);
|
|
}
|
|
|
|
KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
|
|
KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
|
|
fs = ip->i_e2fs;
|
|
if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
|
|
return (EFBIG);
|
|
/*
|
|
* Maybe this should be above the vnode op call, but so long as
|
|
* file servers have no limits, I don't think it matters.
|
|
*/
|
|
if (vn_rlimit_fsize(vp, uio, uio->uio_td))
|
|
return (EFBIG);
|
|
|
|
resid = uio->uio_resid;
|
|
osize = ip->i_size;
|
|
if (seqcount > BA_SEQMAX)
|
|
flags = BA_SEQMAX << BA_SEQSHIFT;
|
|
else
|
|
flags = seqcount << BA_SEQSHIFT;
|
|
if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
|
|
flags |= IO_SYNC;
|
|
|
|
for (error = 0; uio->uio_resid > 0;) {
|
|
lbn = lblkno(fs, uio->uio_offset);
|
|
blkoffset = blkoff(fs, uio->uio_offset);
|
|
xfersize = fs->e2fs_fsize - blkoffset;
|
|
if (uio->uio_resid < xfersize)
|
|
xfersize = uio->uio_resid;
|
|
if (uio->uio_offset + xfersize > ip->i_size)
|
|
vnode_pager_setsize(vp, uio->uio_offset + xfersize);
|
|
|
|
/*
|
|
* We must perform a read-before-write if the transfer size
|
|
* does not cover the entire buffer.
|
|
*/
|
|
if (fs->e2fs_bsize > xfersize)
|
|
flags |= BA_CLRBUF;
|
|
else
|
|
flags &= ~BA_CLRBUF;
|
|
error = ext2_balloc(ip, lbn, blkoffset + xfersize,
|
|
ap->a_cred, &bp, flags);
|
|
if (error != 0)
|
|
break;
|
|
|
|
if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
|
|
bp->b_flags |= B_NOCACHE;
|
|
if (uio->uio_offset + xfersize > ip->i_size)
|
|
ip->i_size = uio->uio_offset + xfersize;
|
|
size = blksize(fs, ip, lbn) - bp->b_resid;
|
|
if (size < xfersize)
|
|
xfersize = size;
|
|
|
|
error =
|
|
uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
|
|
/*
|
|
* If the buffer is not already filled and we encounter an
|
|
* error while trying to fill it, we have to clear out any
|
|
* garbage data from the pages instantiated for the buffer.
|
|
* If we do not, a failed uiomove() during a write can leave
|
|
* the prior contents of the pages exposed to a userland mmap.
|
|
*
|
|
* Note that we need only clear buffers with a transfer size
|
|
* equal to the block size because buffers with a shorter
|
|
* transfer size were cleared above by the call to ext2_balloc()
|
|
* with the BA_CLRBUF flag set.
|
|
*
|
|
* If the source region for uiomove identically mmaps the
|
|
* buffer, uiomove() performed the NOP copy, and the buffer
|
|
* content remains valid because the page fault handler
|
|
* validated the pages.
|
|
*/
|
|
if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
|
|
fs->e2fs_bsize == xfersize)
|
|
vfs_bio_clrbuf(bp);
|
|
if (ioflag & (IO_VMIO|IO_DIRECT)) {
|
|
bp->b_flags |= B_RELBUF;
|
|
}
|
|
|
|
/*
|
|
* If IO_SYNC each buffer is written synchronously. Otherwise
|
|
* if we have a severe page deficiency write the buffer
|
|
* asynchronously. Otherwise try to cluster, and if that
|
|
* doesn't do it then either do an async write (if O_DIRECT),
|
|
* or a delayed write (if not).
|
|
*/
|
|
if (ioflag & IO_SYNC) {
|
|
(void)bwrite(bp);
|
|
} else if (vm_page_count_severe() ||
|
|
buf_dirty_count_severe() ||
|
|
(ioflag & IO_ASYNC)) {
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
bawrite(bp);
|
|
} else if (xfersize + blkoffset == fs->e2fs_fsize) {
|
|
if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
cluster_write(vp, bp, ip->i_size, seqcount, 0);
|
|
} else {
|
|
bawrite(bp);
|
|
}
|
|
} else if (ioflag & IO_DIRECT) {
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
bawrite(bp);
|
|
} else {
|
|
bp->b_flags |= B_CLUSTEROK;
|
|
bdwrite(bp);
|
|
}
|
|
if (error || xfersize == 0)
|
|
break;
|
|
}
|
|
/*
|
|
* If we successfully wrote any data, and we are not the superuser
|
|
* we clear the setuid and setgid bits as a precaution against
|
|
* tampering.
|
|
*/
|
|
if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
|
|
ap->a_cred) {
|
|
if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
|
|
ip->i_mode &= ~(ISUID | ISGID);
|
|
}
|
|
if (error) {
|
|
if (ioflag & IO_UNIT) {
|
|
(void)ext2_truncate(vp, osize,
|
|
ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
|
|
uio->uio_offset -= resid - uio->uio_resid;
|
|
uio->uio_resid = resid;
|
|
}
|
|
}
|
|
if (uio->uio_resid != resid) {
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
if (ioflag & IO_SYNC)
|
|
error = ext2_update(vp, 1);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* get page routine
|
|
*/
|
|
static int
|
|
ext2_getpages( struct vop_getpages_args *ap)
|
|
{
|
|
int i;
|
|
vm_page_t mreq;
|
|
int pcount;
|
|
|
|
pcount = round_page(ap->a_count) / PAGE_SIZE;
|
|
mreq = ap->a_m[ap->a_reqpage];
|
|
|
|
/*
|
|
* if ANY DEV_BSIZE blocks are valid on a large filesystem block,
|
|
* then the entire page is valid. Since the page may be mapped,
|
|
* user programs might reference data beyond the actual end of file
|
|
* occuring within the page. We have to zero that data.
|
|
*/
|
|
VM_OBJECT_WLOCK(mreq->object);
|
|
if (mreq->valid) {
|
|
if (mreq->valid != VM_PAGE_BITS_ALL)
|
|
vm_page_zero_invalid(mreq, TRUE);
|
|
for (i = 0; i < pcount; i++) {
|
|
if (i != ap->a_reqpage) {
|
|
vm_page_lock(ap->a_m[i]);
|
|
vm_page_free(ap->a_m[i]);
|
|
vm_page_unlock(ap->a_m[i]);
|
|
}
|
|
}
|
|
VM_OBJECT_WUNLOCK(mreq->object);
|
|
return VM_PAGER_OK;
|
|
}
|
|
VM_OBJECT_WUNLOCK(mreq->object);
|
|
|
|
return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
|
|
ap->a_count,
|
|
ap->a_reqpage);
|
|
}
|