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| Current File : //compat/linux/proc/68247/root/compat/linux/proc/68247/root/sys/fs/ntfs/ntfs_vnops.c |
/* $NetBSD: ntfs_vnops.c,v 1.23 1999/10/31 19:45:27 jdolecek Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* John Heidemann of the UCLA Ficus project.
*
* 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.
*
* $FreeBSD: release/9.1.0/sys/fs/ntfs/ntfs_vnops.c 230197 2012-01-16 05:22:18Z kevlo $
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/malloc.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/dirent.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_page.h>
#include <vm/vm_object.h>
#include <vm/vm_pager.h>
#include <vm/vnode_pager.h>
#include <vm/vm_extern.h>
#include <sys/sysctl.h>
/*#define NTFS_DEBUG 1*/
#include <fs/ntfs/ntfs.h>
#include <fs/ntfs/ntfs_inode.h>
#include <fs/ntfs/ntfs_subr.h>
#include <sys/unistd.h> /* for pathconf(2) constants */
static vop_read_t ntfs_read;
static vop_write_t ntfs_write;
static vop_getattr_t ntfs_getattr;
static vop_inactive_t ntfs_inactive;
static vop_reclaim_t ntfs_reclaim;
static vop_bmap_t ntfs_bmap;
static vop_strategy_t ntfs_strategy;
static vop_access_t ntfs_access;
static vop_open_t ntfs_open;
static vop_close_t ntfs_close;
static vop_readdir_t ntfs_readdir;
static vop_cachedlookup_t ntfs_lookup;
static vop_fsync_t ntfs_fsync;
static vop_pathconf_t ntfs_pathconf;
static vop_vptofh_t ntfs_vptofh;
/*
* This is a noop, simply returning what one has been given.
*/
int
ntfs_bmap(ap)
struct vop_bmap_args /* {
struct vnode *a_vp;
daddr_t a_bn;
struct bufobj **a_bop;
daddr_t *a_bnp;
int *a_runp;
int *a_runb;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
dprintf(("ntfs_bmap: vn: %p, blk: %d\n", ap->a_vp,(u_int32_t)ap->a_bn));
if (ap->a_bop != NULL)
*ap->a_bop = &vp->v_bufobj;
if (ap->a_bnp != NULL)
*ap->a_bnp = ap->a_bn;
if (ap->a_runp != NULL)
*ap->a_runp = 0;
if (ap->a_runb != NULL)
*ap->a_runb = 0;
return (0);
}
static int
ntfs_read(ap)
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct fnode *fp = VTOF(vp);
register struct ntnode *ip = FTONT(fp);
struct uio *uio = ap->a_uio;
struct ntfsmount *ntmp = ip->i_mp;
struct buf *bp;
daddr_t cn;
int resid, off, toread;
int error;
dprintf(("ntfs_read: ino: %d, off: %d resid: %d, segflg: %d\n",ip->i_number,(u_int32_t)uio->uio_offset,uio->uio_resid,uio->uio_segflg));
dprintf(("ntfs_read: filesize: %d",(u_int32_t)fp->f_size));
/* don't allow reading after end of file */
if (uio->uio_offset > fp->f_size)
return (0);
resid = MIN(uio->uio_resid, fp->f_size - uio->uio_offset);
dprintf((", resid: %d\n", resid));
error = 0;
while (resid) {
cn = ntfs_btocn(uio->uio_offset);
off = ntfs_btocnoff(uio->uio_offset);
toread = MIN(off + resid, ntfs_cntob(1));
error = bread(vp, cn, ntfs_cntob(1), NOCRED, &bp);
if (error) {
brelse(bp);
break;
}
error = uiomove(bp->b_data + off, toread - off, uio);
if(error) {
brelse(bp);
break;
}
brelse(bp);
resid -= toread - off;
}
return (error);
}
static int
ntfs_getattr(ap)
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct fnode *fp = VTOF(vp);
register struct ntnode *ip = FTONT(fp);
register struct vattr *vap = ap->a_vap;
dprintf(("ntfs_getattr: %d, flags: %d\n",ip->i_number,ip->i_flag));
vap->va_fsid = dev2udev(ip->i_dev);
vap->va_fileid = ip->i_number;
vap->va_mode = ip->i_mp->ntm_mode;
vap->va_nlink = (ip->i_nlink || ip->i_flag & IN_LOADED ? ip->i_nlink : 1);
vap->va_uid = ip->i_mp->ntm_uid;
vap->va_gid = ip->i_mp->ntm_gid;
vap->va_rdev = NODEV;
vap->va_size = fp->f_size;
vap->va_bytes = fp->f_allocated;
vap->va_atime = ntfs_nttimetounix(fp->f_times.t_access);
vap->va_mtime = ntfs_nttimetounix(fp->f_times.t_write);
vap->va_ctime = ntfs_nttimetounix(fp->f_times.t_create);
vap->va_flags = ip->i_flag;
vap->va_gen = 0;
vap->va_blocksize = ip->i_mp->ntm_spc * ip->i_mp->ntm_bps;
vap->va_type = vp->v_type;
vap->va_filerev = 0;
return (0);
}
/*
* Last reference to an ntnode. If necessary, write or delete it.
*/
int
ntfs_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
} */ *ap;
{
#ifdef NTFS_DEBUG
register struct ntnode *ip = VTONT(ap->a_vp);
#endif
dprintf(("ntfs_inactive: vnode: %p, ntnode: %d\n", ap->a_vp,
ip->i_number));
/* XXX since we don't support any filesystem changes
* right now, nothing more needs to be done
*/
return (0);
}
/*
* Reclaim an fnode/ntnode so that it can be used for other purposes.
*/
int
ntfs_reclaim(ap)
struct vop_reclaim_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct fnode *fp = VTOF(vp);
register struct ntnode *ip = FTONT(fp);
int error;
dprintf(("ntfs_reclaim: vnode: %p, ntnode: %d\n", vp, ip->i_number));
/*
* Destroy the vm object and flush associated pages.
*/
vnode_destroy_vobject(vp);
if ((error = ntfs_ntget(ip)) != 0)
return (error);
/* Purge old data structures associated with the inode. */
ntfs_frele(fp);
ntfs_ntput(ip);
vp->v_data = NULL;
return (0);
}
/*
* Calculate the logical to physical mapping if not done already,
* then call the device strategy routine.
*/
int
ntfs_strategy(ap)
struct vop_strategy_args /* {
struct buf *a_bp;
} */ *ap;
{
register struct buf *bp = ap->a_bp;
register struct vnode *vp = ap->a_vp;
register struct fnode *fp = VTOF(vp);
register struct ntnode *ip = FTONT(fp);
struct ntfsmount *ntmp = ip->i_mp;
int error;
dprintf(("ntfs_strategy: offset: %d, blkno: %d, lblkno: %d\n",
(u_int32_t)bp->b_offset,(u_int32_t)bp->b_blkno,
(u_int32_t)bp->b_lblkno));
dprintf(("strategy: bcount: %d flags: 0x%x\n",
(u_int32_t)bp->b_bcount,bp->b_flags));
if (bp->b_iocmd == BIO_READ) {
u_int32_t toread;
if (ntfs_cntob(bp->b_blkno) >= fp->f_size) {
clrbuf(bp);
error = 0;
} else {
toread = MIN(bp->b_bcount,
fp->f_size-ntfs_cntob(bp->b_blkno));
dprintf(("ntfs_strategy: toread: %d, fsize: %d\n",
toread,(u_int32_t)fp->f_size));
error = ntfs_readattr(ntmp, ip, fp->f_attrtype,
fp->f_attrname, ntfs_cntob(bp->b_blkno),
toread, bp->b_data, NULL);
if (error) {
printf("ntfs_strategy: ntfs_readattr failed\n");
bp->b_error = error;
bp->b_ioflags |= BIO_ERROR;
}
bzero(bp->b_data + toread, bp->b_bcount - toread);
}
} else {
size_t tmp;
u_int32_t towrite;
if (ntfs_cntob(bp->b_blkno) + bp->b_bcount >= fp->f_size) {
printf("ntfs_strategy: CAN'T EXTEND FILE\n");
bp->b_error = error = EFBIG;
bp->b_ioflags |= BIO_ERROR;
} else {
towrite = MIN(bp->b_bcount,
fp->f_size-ntfs_cntob(bp->b_blkno));
dprintf(("ntfs_strategy: towrite: %d, fsize: %d\n",
towrite,(u_int32_t)fp->f_size));
error = ntfs_writeattr_plain(ntmp, ip, fp->f_attrtype,
fp->f_attrname, ntfs_cntob(bp->b_blkno),towrite,
bp->b_data, &tmp, NULL);
if (error) {
printf("ntfs_strategy: ntfs_writeattr fail\n");
bp->b_error = error;
bp->b_ioflags |= BIO_ERROR;
}
}
}
bufdone(bp);
return (0);
}
static int
ntfs_write(ap)
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct fnode *fp = VTOF(vp);
register struct ntnode *ip = FTONT(fp);
struct uio *uio = ap->a_uio;
struct ntfsmount *ntmp = ip->i_mp;
u_int64_t towrite;
size_t written;
int error;
dprintf(("ntfs_write: ino: %d, off: %d resid: %d, segflg: %d\n",ip->i_number,(u_int32_t)uio->uio_offset,uio->uio_resid,uio->uio_segflg));
dprintf(("ntfs_write: filesize: %d",(u_int32_t)fp->f_size));
if (uio->uio_resid + uio->uio_offset > fp->f_size) {
printf("ntfs_write: CAN'T WRITE BEYOND END OF FILE\n");
return (EFBIG);
}
towrite = MIN(uio->uio_resid, fp->f_size - uio->uio_offset);
dprintf((", towrite: %d\n",(u_int32_t)towrite));
error = ntfs_writeattr_plain(ntmp, ip, fp->f_attrtype,
fp->f_attrname, uio->uio_offset, towrite, NULL, &written, uio);
#ifdef NTFS_DEBUG
if (error)
printf("ntfs_write: ntfs_writeattr failed: %d\n", error);
#endif
return (error);
}
int
ntfs_access(ap)
struct vop_access_args /* {
struct vnode *a_vp;
accmode_t a_accmode;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct ntnode *ip = VTONT(vp);
accmode_t accmode = ap->a_accmode;
dprintf(("ntfs_access: %d\n",ip->i_number));
/*
* Disallow write attempts on read-only filesystems;
* unless the file is a socket, fifo, or a block or
* character device resident on the filesystem.
*/
if (accmode & VWRITE) {
switch ((int)vp->v_type) {
case VDIR:
case VLNK:
case VREG:
if (vp->v_mount->mnt_flag & MNT_RDONLY)
return (EROFS);
break;
}
}
return (vaccess(vp->v_type, ip->i_mp->ntm_mode, ip->i_mp->ntm_uid,
ip->i_mp->ntm_gid, ap->a_accmode, ap->a_cred, NULL));
}
/*
* Open called.
*
* Nothing to do.
*/
/* ARGSUSED */
static int
ntfs_open(ap)
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
#ifdef NTFS_DEBUG
register struct vnode *vp = ap->a_vp;
register struct ntnode *ip = VTONT(vp);
printf("ntfs_open: %d\n",ip->i_number);
#endif
vnode_create_vobject(ap->a_vp, VTOF(ap->a_vp)->f_size, ap->a_td);
/*
* Files marked append-only must be opened for appending.
*/
return (0);
}
/*
* Close called.
*
* Update the times on the inode.
*/
/* ARGSUSED */
static int
ntfs_close(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct thread *a_td;
} */ *ap;
{
#ifdef NTFS_DEBUG
register struct vnode *vp = ap->a_vp;
register struct ntnode *ip = VTONT(vp);
printf("ntfs_close: %d\n",ip->i_number);
#endif
return (0);
}
int
ntfs_readdir(ap)
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
int *a_ncookies;
u_int **cookies;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct fnode *fp = VTOF(vp);
register struct ntnode *ip = FTONT(fp);
struct uio *uio = ap->a_uio;
struct ntfsmount *ntmp = ip->i_mp;
int i, j, error = 0;
char *c, tmpbuf[5];
u_int32_t faked = 0, num;
int ncookies = 0;
struct dirent cde;
off_t off;
dprintf(("ntfs_readdir %d off: %d resid: %d\n",ip->i_number,(u_int32_t)uio->uio_offset,uio->uio_resid));
off = uio->uio_offset;
/* Simulate . in every dir except ROOT */
if( ip->i_number != NTFS_ROOTINO ) {
struct dirent dot = { NTFS_ROOTINO,
sizeof(struct dirent), DT_DIR, 1, "." };
if( uio->uio_offset < sizeof(struct dirent) ) {
dot.d_fileno = ip->i_number;
error = uiomove((char *)&dot,sizeof(struct dirent),uio);
if(error)
return (error);
ncookies ++;
}
}
/* Simulate .. in every dir including ROOT */
if( uio->uio_offset < 2 * sizeof(struct dirent) ) {
struct dirent dotdot = { NTFS_ROOTINO,
sizeof(struct dirent), DT_DIR, 2, ".." };
error = uiomove((char *)&dotdot,sizeof(struct dirent),uio);
if(error)
return (error);
ncookies ++;
}
faked = (ip->i_number == NTFS_ROOTINO) ? 1 : 2;
num = uio->uio_offset / sizeof(struct dirent) - faked;
while( uio->uio_resid >= sizeof(struct dirent) ) {
struct attr_indexentry *iep;
error = ntfs_ntreaddir(ntmp, fp, num, &iep);
if(error)
return (error);
if( NULL == iep )
break;
for(; !(iep->ie_flag & NTFS_IEFLAG_LAST) && (uio->uio_resid >= sizeof(struct dirent));
iep = NTFS_NEXTREC(iep, struct attr_indexentry *))
{
if(!ntfs_isnamepermitted(ntmp,iep))
continue;
for(i=0, j=0; i<iep->ie_fnamelen; i++) {
c = NTFS_U28(iep->ie_fname[i]);
while (*c != '\0')
cde.d_name[j++] = *c++;
}
cde.d_name[j] = '\0';
dprintf(("ntfs_readdir: elem: %d, fname:[%s] type: %d, flag: %d, ",
num, cde.d_name, iep->ie_fnametype,
iep->ie_flag));
cde.d_namlen = j;
cde.d_fileno = iep->ie_number;
cde.d_type = (iep->ie_fflag & NTFS_FFLAG_DIR) ? DT_DIR : DT_REG;
cde.d_reclen = sizeof(struct dirent);
dprintf(("%s\n", (cde.d_type == DT_DIR) ? "dir":"reg"));
error = uiomove((char *)&cde, sizeof(struct dirent), uio);
if(error)
return (error);
ncookies++;
num++;
}
}
dprintf(("ntfs_readdir: %d entries (%d bytes) read\n",
ncookies,(u_int)(uio->uio_offset - off)));
dprintf(("ntfs_readdir: off: %d resid: %d\n",
(u_int32_t)uio->uio_offset,uio->uio_resid));
if (!error && ap->a_ncookies != NULL) {
struct dirent* dpStart;
struct dirent* dp;
u_long *cookies;
u_long *cookiep;
ddprintf(("ntfs_readdir: %d cookies\n",ncookies));
if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
panic("ntfs_readdir: unexpected uio from NFS server");
dpStart = (struct dirent *)
((caddr_t)uio->uio_iov->iov_base -
(uio->uio_offset - off));
cookies = malloc(ncookies * sizeof(u_long),
M_TEMP, M_WAITOK);
for (dp = dpStart, cookiep = cookies, i=0;
i < ncookies;
dp = (struct dirent *)((caddr_t) dp + dp->d_reclen), i++) {
off += dp->d_reclen;
*cookiep++ = (u_int) off;
}
*ap->a_ncookies = ncookies;
*ap->a_cookies = cookies;
}
/*
if (ap->a_eofflag)
*ap->a_eofflag = VTONT(ap->a_vp)->i_size <= uio->uio_offset;
*/
return (error);
}
int
ntfs_lookup(ap)
struct vop_cachedlookup_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
} */ *ap;
{
register struct vnode *dvp = ap->a_dvp;
register struct ntnode *dip = VTONT(dvp);
struct ntfsmount *ntmp = dip->i_mp;
struct componentname *cnp = ap->a_cnp;
struct ucred *cred = cnp->cn_cred;
int error;
dprintf(("ntfs_lookup: \"%.*s\" (%ld bytes) in %d\n",
(int)cnp->cn_namelen, cnp->cn_nameptr, cnp->cn_namelen,
dip->i_number));
error = VOP_ACCESS(dvp, VEXEC, cred, cnp->cn_thread);
if(error)
return (error);
if ((cnp->cn_flags & ISLASTCN) &&
(dvp->v_mount->mnt_flag & MNT_RDONLY) &&
(cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME))
return (EROFS);
if(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
dprintf(("ntfs_lookup: faking . directory in %d\n",
dip->i_number));
VREF(dvp);
*ap->a_vpp = dvp;
error = 0;
} else if (cnp->cn_flags & ISDOTDOT) {
struct ntvattr *vap;
dprintf(("ntfs_lookup: faking .. directory in %d\n",
dip->i_number));
error = ntfs_ntvattrget(ntmp, dip, NTFS_A_NAME, NULL, 0, &vap);
if(error)
return (error);
VOP_UNLOCK(dvp,0);
dprintf(("ntfs_lookup: parentdir: %d\n",
vap->va_a_name->n_pnumber));
error = VFS_VGET(ntmp->ntm_mountp, vap->va_a_name->n_pnumber,
LK_EXCLUSIVE, ap->a_vpp);
ntfs_ntvattrrele(vap);
if (error) {
vn_lock(dvp,LK_EXCLUSIVE|LK_RETRY);
return (error);
}
} else {
error = ntfs_ntlookupfile(ntmp, dvp, cnp, ap->a_vpp);
if (error) {
dprintf(("ntfs_ntlookupfile: returned %d\n", error));
return (error);
}
dprintf(("ntfs_lookup: found ino: %d\n",
VTONT(*ap->a_vpp)->i_number));
}
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, *ap->a_vpp, cnp);
return (error);
}
/*
* Flush the blocks of a file to disk.
*
* This function is worthless for vnodes that represent directories. Maybe we
* could just do a sync if they try an fsync on a directory file.
*/
static int
ntfs_fsync(ap)
struct vop_fsync_args /* {
struct vnode *a_vp;
struct ucred *a_cred;
int a_waitfor;
struct thread *a_td;
} */ *ap;
{
return (0);
}
/*
* Return POSIX pathconf information applicable to NTFS filesystem
*/
int
ntfs_pathconf(ap)
struct vop_pathconf_args *ap;
{
switch (ap->a_name) {
case _PC_LINK_MAX:
*ap->a_retval = 1;
return (0);
case _PC_NAME_MAX:
*ap->a_retval = NTFS_MAXFILENAME;
return (0);
case _PC_PATH_MAX:
*ap->a_retval = PATH_MAX;
return (0);
case _PC_CHOWN_RESTRICTED:
*ap->a_retval = 1;
return (0);
case _PC_NO_TRUNC:
*ap->a_retval = 0;
return (0);
default:
return (EINVAL);
}
/* NOTREACHED */
}
int
ntfs_vptofh(ap)
struct vop_vptofh_args /* {
struct vnode *a_vp;
struct fid *a_fhp;
} */ *ap;
{
register struct ntnode *ntp;
register struct ntfid *ntfhp;
ddprintf(("ntfs_fhtovp(): %p\n", ap->a_vp));
ntp = VTONT(ap->a_vp);
ntfhp = (struct ntfid *)ap->a_fhp;
ntfhp->ntfid_len = sizeof(struct ntfid);
ntfhp->ntfid_ino = ntp->i_number;
/* ntfhp->ntfid_gen = ntp->i_gen; */
return (0);
}
/*
* Global vfs data structures
*/
struct vop_vector ntfs_vnodeops = {
.vop_default = &default_vnodeops,
.vop_access = ntfs_access,
.vop_bmap = ntfs_bmap,
.vop_cachedlookup = ntfs_lookup,
.vop_close = ntfs_close,
.vop_fsync = ntfs_fsync,
.vop_getattr = ntfs_getattr,
.vop_inactive = ntfs_inactive,
.vop_lookup = vfs_cache_lookup,
.vop_open = ntfs_open,
.vop_pathconf = ntfs_pathconf,
.vop_read = ntfs_read,
.vop_readdir = ntfs_readdir,
.vop_reclaim = ntfs_reclaim,
.vop_strategy = ntfs_strategy,
.vop_write = ntfs_write,
.vop_vptofh = ntfs_vptofh,
};