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BSD 4_3_Reno release
[unix-history] / usr / src / sys / ufs / ufs_vnops.c
/*
* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
* All rights reserved.
*
* Redistribution is only permitted until one year after the first shipment
* of 4.4BSD by the Regents. Otherwise, redistribution and use in source and
* binary forms are permitted provided that: (1) source distributions retain
* this entire copyright notice and comment, and (2) distributions including
* binaries display the following acknowledgement: This product includes
* software developed by the University of California, Berkeley and its
* contributors'' in the documentation or other materials provided with the
* distribution and in all advertising materials mentioning features or use
* of this software. 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 AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#)ufs_vnops.c 7.45 (Berkeley) 6/28/90
*/
#include "param.h"
#include "systm.h"
#include "user.h"
#include "kernel.h"
#include "file.h"
#include "stat.h"
#include "buf.h"
#include "proc.h"
#include "socket.h"
#include "socketvar.h"
#include "conf.h"
#include "mount.h"
#include "vnode.h"
#include "specdev.h"
#include "../ufs/quota.h"
#include "../ufs/inode.h"
#include "../ufs/fs.h"
/*
* Global vfs data structures for ufs
*/
int ufs_lookup(),
ufs_create(),
ufs_mknod(),
ufs_open(),
ufs_close(),
ufs_access(),
ufs_getattr(),
ufs_setattr(),
ufs_read(),
ufs_write(),
ufs_ioctl(),
ufs_select(),
ufs_mmap(),
ufs_fsync(),
ufs_seek(),
ufs_remove(),
ufs_link(),
ufs_rename(),
ufs_mkdir(),
ufs_rmdir(),
ufs_symlink(),
ufs_readdir(),
ufs_readlink(),
ufs_abortop(),
ufs_inactive(),
ufs_reclaim(),
ufs_lock(),
ufs_unlock(),
ufs_bmap(),
ufs_strategy(),
ufs_print(),
ufs_islocked();
struct vnodeops ufs_vnodeops = {
ufs_lookup, /* lookup */
ufs_create, /* create */
ufs_mknod, /* mknod */
ufs_open, /* open */
ufs_close, /* close */
ufs_access, /* access */
ufs_getattr, /* getattr */
ufs_setattr, /* setattr */
ufs_read, /* read */
ufs_write, /* write */
ufs_ioctl, /* ioctl */
ufs_select, /* select */
ufs_mmap, /* mmap */
ufs_fsync, /* fsync */
ufs_seek, /* seek */
ufs_remove, /* remove */
ufs_link, /* link */
ufs_rename, /* rename */
ufs_mkdir, /* mkdir */
ufs_rmdir, /* rmdir */
ufs_symlink, /* symlink */
ufs_readdir, /* readdir */
ufs_readlink, /* readlink */
ufs_abortop, /* abortop */
ufs_inactive, /* inactive */
ufs_reclaim, /* reclaim */
ufs_lock, /* lock */
ufs_unlock, /* unlock */
ufs_bmap, /* bmap */
ufs_strategy, /* strategy */
ufs_print, /* print */
ufs_islocked, /* islocked */
};
int spec_lookup(),
spec_open(),
ufsspec_read(),
ufsspec_write(),
spec_strategy(),
spec_bmap(),
spec_ioctl(),
spec_select(),
ufsspec_close(),
spec_badop(),
spec_nullop();
struct vnodeops spec_inodeops = {
spec_lookup, /* lookup */
spec_badop, /* create */
spec_badop, /* mknod */
spec_open, /* open */
ufsspec_close, /* close */
ufs_access, /* access */
ufs_getattr, /* getattr */
ufs_setattr, /* setattr */
ufsspec_read, /* read */
ufsspec_write, /* write */
spec_ioctl, /* ioctl */
spec_select, /* select */
spec_badop, /* mmap */
spec_nullop, /* fsync */
spec_badop, /* seek */
spec_badop, /* remove */
spec_badop, /* link */
spec_badop, /* rename */
spec_badop, /* mkdir */
spec_badop, /* rmdir */
spec_badop, /* symlink */
spec_badop, /* readdir */
spec_badop, /* readlink */
spec_badop, /* abortop */
ufs_inactive, /* inactive */
ufs_reclaim, /* reclaim */
ufs_lock, /* lock */
ufs_unlock, /* unlock */
spec_bmap, /* bmap */
spec_strategy, /* strategy */
ufs_print, /* print */
ufs_islocked, /* islocked */
};
#ifdef FIFO
int fifo_lookup(),
fifo_open(),
ufsfifo_read(),
ufsfifo_write(),
fifo_bmap(),
fifo_ioctl(),
fifo_select(),
ufsfifo_close(),
fifo_print(),
fifo_badop(),
fifo_nullop();
struct vnodeops fifo_inodeops = {
fifo_lookup, /* lookup */
fifo_badop, /* create */
fifo_badop, /* mknod */
fifo_open, /* open */
ufsfifo_close, /* close */
ufs_access, /* access */
ufs_getattr, /* getattr */
ufs_setattr, /* setattr */
ufsfifo_read, /* read */
ufsfifo_write, /* write */
fifo_ioctl, /* ioctl */
fifo_select, /* select */
fifo_badop, /* mmap */
fifo_nullop, /* fsync */
fifo_badop, /* seek */
fifo_badop, /* remove */
fifo_badop, /* link */
fifo_badop, /* rename */
fifo_badop, /* mkdir */
fifo_badop, /* rmdir */
fifo_badop, /* symlink */
fifo_badop, /* readdir */
fifo_badop, /* readlink */
fifo_badop, /* abortop */
ufs_inactive, /* inactive */
ufs_reclaim, /* reclaim */
ufs_lock, /* lock */
ufs_unlock, /* unlock */
fifo_bmap, /* bmap */
fifo_badop, /* strategy */
ufs_print, /* print */
ufs_islocked, /* islocked */
};
#endif /* FIFO */
enum vtype iftovt_tab[16] = {
VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
};
int vttoif_tab[9] = {
0, IFREG, IFDIR, IFBLK, IFCHR, IFLNK, IFSOCK, IFIFO, IFMT,
};
/*
* Create a regular file
*/
ufs_create(ndp, vap)
struct nameidata *ndp;
struct vattr *vap;
{
struct inode *ip;
int error;
if (error = maknode(MAKEIMODE(vap->va_type, vap->va_mode), ndp, &ip))
return (error);
ndp->ni_vp = ITOV(ip);
return (0);
}
/*
* Mknod vnode call
*/
/* ARGSUSED */
ufs_mknod(ndp, vap, cred)
struct nameidata *ndp;
struct ucred *cred;
struct vattr *vap;
{
register struct vnode *vp;
struct inode *ip;
int error;
if (error = maknode(MAKEIMODE(vap->va_type, vap->va_mode), ndp, &ip))
return (error);
ip->i_flag |= IACC|IUPD|ICHG;
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 so that it will be reloaded by iget and
* checked to see if it is an alias of an existing entry
* in the inode cache.
*/
vp = ITOV(ip);
vput(vp);
vp->v_type = VNON;
vgone(vp);
return (0);
}
/*
* Open called.
*
* Nothing to do.
*/
/* ARGSUSED */
ufs_open(vp, mode, cred)
struct vnode *vp;
int mode;
struct ucred *cred;
{
return (0);
}
/*
* Close called
*
* Update the times on the inode.
*/
/* ARGSUSED */
ufs_close(vp, fflag, cred)
struct vnode *vp;
int fflag;
struct ucred *cred;
{
register struct inode *ip = VTOI(vp);
if (vp->v_usecount > 1 && !(ip->i_flag & ILOCKED))
ITIMES(ip, &time, &time);
return (0);
}
/*
* Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
* The mode is shifted to select the owner/group/other fields. The
* super user is granted all permissions.
*/
ufs_access(vp, mode, cred)
struct vnode *vp;
register int mode;
struct ucred *cred;
{
register struct inode *ip = VTOI(vp);
register gid_t *gp;
int i, error;
#ifdef DIAGNOSTIC
if (!VOP_ISLOCKED(vp)) {
vprint("ufs_access: not locked", vp);
panic("ufs_access: not locked");
}
#endif
#ifdef QUOTA
if (mode & VWRITE) {
switch (vp->v_type) {
case VREG: case VDIR: case VLNK:
if (error = getinoquota(ip))
return (error);
}
}
#endif /* QUOTA */
/*
* If you're the super-user, you always get access.
*/
if (cred->cr_uid == 0)
return (0);
/*
* Access check is based on only one of owner, group, public.
* If not owner, then check group. If not a member of the
* group, then check public access.
*/
if (cred->cr_uid != ip->i_uid) {
mode >>= 3;
gp = cred->cr_groups;
for (i = 0; i < cred->cr_ngroups; i++, gp++)
if (ip->i_gid == *gp)
goto found;
mode >>= 3;
found:
;
}
if ((ip->i_mode & mode) != 0)
return (0);
return (EACCES);
}
/* ARGSUSED */
ufs_getattr(vp, vap, cred)
struct vnode *vp;
register struct vattr *vap;
struct ucred *cred;
{
register struct inode *ip = VTOI(vp);
ITIMES(ip, &time, &time);
/*
* Copy from inode table
*/
vap->va_fsid = 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 = (dev_t)ip->i_rdev;
#ifdef tahoe
vap->va_size = ip->i_size;
vap->va_size_rsv = 0;
#else
vap->va_qsize = ip->i_din.di_qsize;
#endif
vap->va_atime.tv_sec = ip->i_atime;
vap->va_atime.tv_usec = 0;
vap->va_mtime.tv_sec = ip->i_mtime;
vap->va_mtime.tv_usec = 0;
vap->va_ctime.tv_sec = ip->i_ctime;
vap->va_ctime.tv_usec = 0;
vap->va_flags = ip->i_flags;
vap->va_gen = ip->i_gen;
/* this doesn't belong here */
if (vp->v_type == VBLK)
vap->va_blocksize = BLKDEV_IOSIZE;
else if (vp->v_type == VCHR)
vap->va_blocksize = MAXBSIZE;
else
vap->va_blocksize = ip->i_fs->fs_bsize;
vap->va_bytes = dbtob(ip->i_blocks);
vap->va_bytes_rsv = 0;
vap->va_type = vp->v_type;
return (0);
}
/*
* Set attribute vnode op. called from several syscalls
*/
ufs_setattr(vp, vap, cred)
register struct vnode *vp;
register struct vattr *vap;
register struct ucred *cred;
{
register struct inode *ip = VTOI(vp);
int error = 0;
/*
* Check for unsetable 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);
}
/*
* Go through the fields and update iff not VNOVAL.
*/
if (vap->va_uid != (u_short)VNOVAL || vap->va_gid != (u_short)VNOVAL)
if (error = chown1(vp, vap->va_uid, vap->va_gid, cred))
return (error);
if (vap->va_size != VNOVAL) {
if (vp->v_type == VDIR)
return (EISDIR);
if (error = itrunc(ip, vap->va_size, 0)) /* XXX IO_SYNC? */
return (error);
}
if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
if (cred->cr_uid != ip->i_uid &&
(error = suser(cred, &u.u_acflag)))
return (error);
if (vap->va_atime.tv_sec != VNOVAL)
ip->i_flag |= IACC;
if (vap->va_mtime.tv_sec != VNOVAL)
ip->i_flag |= IUPD;
ip->i_flag |= ICHG;
if (error = iupdat(ip, &vap->va_atime, &vap->va_mtime, 1))
return (error);
}
if (vap->va_mode != (u_short)VNOVAL)
error = chmod1(vp, (int)vap->va_mode, cred);
if (vap->va_flags != VNOVAL) {
if (cred->cr_uid != ip->i_uid &&
(error = suser(cred, &u.u_acflag)))
return (error);
if (cred->cr_uid == 0) {
ip->i_flags = vap->va_flags;
} else {
ip->i_flags &= 0xffff0000;
ip->i_flags |= (vap->va_flags & 0xffff);
}
ip->i_flag |= ICHG;
}
return (error);
}
/*
* Change the mode on a file.
* Inode must be locked before calling.
*/
chmod1(vp, mode, cred)
register struct vnode *vp;
register int mode;
struct ucred *cred;
{
register struct inode *ip = VTOI(vp);
int error;
if (cred->cr_uid != ip->i_uid &&
(error = suser(cred, &u.u_acflag)))
return (error);
ip->i_mode &= ~07777;
if (cred->cr_uid) {
if (vp->v_type != VDIR)
mode &= ~ISVTX;
if (!groupmember(ip->i_gid, cred))
mode &= ~ISGID;
}
ip->i_mode |= mode & 07777;
ip->i_flag |= ICHG;
if ((vp->v_flag & VTEXT) && (ip->i_mode & ISVTX) == 0)
xrele(vp);
return (0);
}
/*
* Perform chown operation on inode ip;
* inode must be locked prior to call.
*/
chown1(vp, uid, gid, cred)
register struct vnode *vp;
uid_t uid;
gid_t gid;
struct ucred *cred;
{
register struct inode *ip = VTOI(vp);
uid_t ouid;
gid_t ogid;
int error = 0;
#ifdef QUOTA
register int i;
long change;
#endif
if (uid == (u_short)VNOVAL)
uid = ip->i_uid;
if (gid == (u_short)VNOVAL)
gid = ip->i_gid;
/*
* If we don't own the file, are trying to change the owner
* of the file, or are not a member of the target group,
* the caller must be superuser or the call fails.
*/
if ((cred->cr_uid != ip->i_uid || uid != ip->i_uid ||
!groupmember((gid_t)gid, cred)) &&
(error = suser(cred, &u.u_acflag)))
return (error);
ouid = ip->i_uid;
ogid = ip->i_gid;
#ifdef QUOTA
if (error = getinoquota(ip))
return (error);
if (ouid == uid) {
dqrele(vp, ip->i_dquot[USRQUOTA]);
ip->i_dquot[USRQUOTA] = NODQUOT;
}
if (ogid == gid) {
dqrele(vp, ip->i_dquot[GRPQUOTA]);
ip->i_dquot[GRPQUOTA] = NODQUOT;
}
change = ip->i_blocks;
(void) chkdq(ip, -change, cred, CHOWN);
(void) chkiq(ip, -1, cred, CHOWN);
for (i = 0; i < MAXQUOTAS; i++) {
dqrele(vp, ip->i_dquot[i]);
ip->i_dquot[i] = NODQUOT;
}
#endif
ip->i_uid = uid;
ip->i_gid = gid;
#ifdef QUOTA
if ((error = getinoquota(ip)) == 0) {
if (ouid == uid) {
dqrele(vp, ip->i_dquot[USRQUOTA]);
ip->i_dquot[USRQUOTA] = NODQUOT;
}
if (ogid == gid) {
dqrele(vp, ip->i_dquot[GRPQUOTA]);
ip->i_dquot[GRPQUOTA] = NODQUOT;
}
if ((error = chkdq(ip, change, cred, CHOWN)) == 0) {
if ((error = chkiq(ip, 1, cred, CHOWN)) == 0)
goto good;
else
(void) chkdq(ip, -change, cred, CHOWN|FORCE);
}
for (i = 0; i < MAXQUOTAS; i++) {
dqrele(vp, ip->i_dquot[i]);
ip->i_dquot[i] = NODQUOT;
}
}
ip->i_uid = ouid;
ip->i_gid = ogid;
if (getinoquota(ip) == 0) {
if (ouid == uid) {
dqrele(vp, ip->i_dquot[USRQUOTA]);
ip->i_dquot[USRQUOTA] = NODQUOT;
}
if (ogid == gid) {
dqrele(vp, ip->i_dquot[GRPQUOTA]);
ip->i_dquot[GRPQUOTA] = NODQUOT;
}
(void) chkdq(ip, change, cred, FORCE|CHOWN);
(void) chkiq(ip, 1, cred, FORCE|CHOWN);
(void) getinoquota(ip);
}
return (error);
good:
if (getinoquota(ip))
panic("chown: lost quota");
#endif /* QUOTA */
if (ouid != uid || ogid != gid)
ip->i_flag |= ICHG;
if (ouid != uid && cred->cr_uid != 0)
ip->i_mode &= ~ISUID;
if (ogid != gid && cred->cr_uid != 0)
ip->i_mode &= ~ISGID;
return (0);
}
/*
* Vnode op for reading.
*/
/* ARGSUSED */
ufs_read(vp, uio, ioflag, cred)
struct vnode *vp;
register struct uio *uio;
int ioflag;
struct ucred *cred;
{
register struct inode *ip = VTOI(vp);
register struct fs *fs;
struct buf *bp;
daddr_t lbn, bn, rablock;
int size, diff, error = 0;
long n, on, type;
if (uio->uio_rw != UIO_READ)
panic("ufs_read mode");
type = ip->i_mode & IFMT;
if (type != IFDIR && type != IFREG && type != IFLNK)
panic("ufs_read type");
if (uio->uio_resid == 0)
return (0);
if (uio->uio_offset < 0)
return (EINVAL);
ip->i_flag |= IACC;
fs = ip->i_fs;
do {
lbn = lblkno(fs, uio->uio_offset);
on = blkoff(fs, uio->uio_offset);
n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid);
diff = ip->i_size - uio->uio_offset;
if (diff <= 0)
return (0);
if (diff < n)
n = diff;
size = blksize(fs, ip, lbn);
rablock = lbn + 1;
if (vp->v_lastr + 1 == lbn &&
lblktosize(fs, rablock) < ip->i_size)
error = breada(ITOV(ip), lbn, size, rablock,
blksize(fs, ip, rablock), NOCRED, &bp);
else
error = bread(ITOV(ip), lbn, size, NOCRED, &bp);
vp->v_lastr = lbn;
n = MIN(n, size - bp->b_resid);
if (error) {
brelse(bp);
return (error);
}
error = uiomove(bp->b_un.b_addr + on, (int)n, uio);
if (n + on == fs->fs_bsize || uio->uio_offset == ip->i_size)
bp->b_flags |= B_AGE;
brelse(bp);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
return (error);
}
/*
* Vnode op for writing.
*/
ufs_write(vp, uio, ioflag, cred)
register struct vnode *vp;
struct uio *uio;
int ioflag;
struct ucred *cred;
{
register struct inode *ip = VTOI(vp);
register struct fs *fs;
struct buf *bp;
daddr_t lbn, bn;
u_long osize;
int i, n, on, flags;
int count, size, resid, error = 0;
if (uio->uio_rw != UIO_WRITE)
panic("ufs_write mode");
switch (vp->v_type) {
case VREG:
if (ioflag & IO_APPEND)
uio->uio_offset = ip->i_size;
/* fall through */
case VLNK:
break;
case VDIR:
if ((ioflag & IO_SYNC) == 0)
panic("ufs_write nonsync dir write");
break;
default:
panic("ufs_write type");
}
if (uio->uio_offset < 0)
return (EINVAL);
if (uio->uio_resid == 0)
return (0);
/*
* 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 (vp->v_type == VREG &&
uio->uio_offset + uio->uio_resid >
u.u_rlimit[RLIMIT_FSIZE].rlim_cur) {
psignal(u.u_procp, SIGXFSZ);
return (EFBIG);
}
resid = uio->uio_resid;
osize = ip->i_size;
fs = ip->i_fs;
flags = 0;
if (ioflag & IO_SYNC)
flags = B_SYNC;
do {
lbn = lblkno(fs, uio->uio_offset);
on = blkoff(fs, uio->uio_offset);
n = MIN((unsigned)(fs->fs_bsize - on), uio->uio_resid);
if (n < fs->fs_bsize)
flags |= B_CLRBUF;
else
flags &= ~B_CLRBUF;
if (error = balloc(ip, lbn, (int)(on + n), &bp, flags))
break;
bn = bp->b_blkno;
if (uio->uio_offset + n > ip->i_size)
ip->i_size = uio->uio_offset + n;
size = blksize(fs, ip, lbn);
count = howmany(size, CLBYTES);
for (i = 0; i < count; i++)
munhash(ip->i_devvp, bn + i * CLBYTES / DEV_BSIZE);
n = MIN(n, size - bp->b_resid);
error = uiomove(bp->b_un.b_addr + on, n, uio);
if (ioflag & IO_SYNC)
(void) bwrite(bp);
else if (n + on == fs->fs_bsize) {
bp->b_flags |= B_AGE;
bawrite(bp);
} else
bdwrite(bp);
ip->i_flag |= IUPD|ICHG;
if (cred->cr_uid != 0)
ip->i_mode &= ~(ISUID|ISGID);
} while (error == 0 && uio->uio_resid > 0 && n != 0);
if (error && (ioflag & IO_UNIT)) {
(void) itrunc(ip, osize, ioflag & IO_SYNC);
uio->uio_offset -= resid - uio->uio_resid;
uio->uio_resid = resid;
}
if (!error && (ioflag & IO_SYNC))
error = iupdat(ip, &time, &time, 1);
return (error);
}
/* ARGSUSED */
ufs_ioctl(vp, com, data, fflag, cred)
struct vnode *vp;
int com;
caddr_t data;
int fflag;
struct ucred *cred;
{
return (ENOTTY);
}
/* ARGSUSED */
ufs_select(vp, which, fflags, cred)
struct vnode *vp;
int which, fflags;
struct ucred *cred;
{
return (1); /* XXX */
}
/*
* Mmap a file
*
* NB Currently unsupported.
*/
/* ARGSUSED */
ufs_mmap(vp, fflags, cred)
struct vnode *vp;
int fflags;
struct ucred *cred;
{
return (EINVAL);
}
/*
* Synch an open file.
*/
/* ARGSUSED */
ufs_fsync(vp, fflags, cred, waitfor)
struct vnode *vp;
int fflags;
struct ucred *cred;
int waitfor;
{
struct inode *ip = VTOI(vp);
if (fflags&FWRITE)
ip->i_flag |= ICHG;
vflushbuf(vp, waitfor == MNT_WAIT ? B_SYNC : 0);
return (iupdat(ip, &time, &time, waitfor == MNT_WAIT));
}
/*
* Seek on a file
*
* Nothing to do, so just return.
*/
/* ARGSUSED */
ufs_seek(vp, oldoff, newoff, cred)
struct vnode *vp;
off_t oldoff, newoff;
struct ucred *cred;
{
return (0);
}
/*
* ufs remove
* Hard to avoid races here, especially
* in unlinking directories.
*/
ufs_remove(ndp)
struct nameidata *ndp;
{
register struct inode *ip, *dp;
int error;
ip = VTOI(ndp->ni_vp);
dp = VTOI(ndp->ni_dvp);
error = dirremove(ndp);
if (!error) {
ip->i_nlink--;
ip->i_flag |= ICHG;
}
if (dp == ip)
vrele(ITOV(ip));
else
iput(ip);
iput(dp);
return (error);
}
/*
* link vnode call
*/
ufs_link(vp, ndp)
register struct vnode *vp;
register struct nameidata *ndp;
{
register struct inode *ip = VTOI(vp);
int error;
if (ndp->ni_dvp != vp)
ILOCK(ip);
if (ip->i_nlink == LINK_MAX - 1) {
error = EMLINK;
goto out;
}
ip->i_nlink++;
ip->i_flag |= ICHG;
error = iupdat(ip, &time, &time, 1);
if (!error)
error = direnter(ip, ndp);
out:
if (ndp->ni_dvp != vp)
IUNLOCK(ip);
if (error) {
ip->i_nlink--;
ip->i_flag |= ICHG;
}
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.
*/
ufs_rename(fndp, tndp)
register struct nameidata *fndp, *tndp;
{
register struct inode *ip, *xp, *dp;
struct dirtemplate dirbuf;
int doingdirectory = 0, oldparent = 0, newparent = 0;
int error = 0;
dp = VTOI(fndp->ni_dvp);
ip = VTOI(fndp->ni_vp);
ILOCK(ip);
if ((ip->i_mode&IFMT) == IFDIR) {
register struct direct *d = &fndp->ni_dent;
/*
* Avoid ".", "..", and aliases of "." for obvious reasons.
*/
if ((d->d_namlen == 1 && d->d_name[0] == '.') || dp == ip ||
fndp->ni_isdotdot || (ip->i_flag & IRENAME)) {
VOP_ABORTOP(tndp);
vput(tndp->ni_dvp);
if (tndp->ni_vp)
vput(tndp->ni_vp);
VOP_ABORTOP(fndp);
vrele(fndp->ni_dvp);
vput(fndp->ni_vp);
return (EINVAL);
}
ip->i_flag |= IRENAME;
oldparent = dp->i_number;
doingdirectory++;
}
vrele(fndp->ni_dvp);
/*
* 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 |= ICHG;
error = iupdat(ip, &time, &time, 1);
IUNLOCK(ip);
/*
* When the target exists, both the directory
* and target vnodes are returned locked.
*/
dp = VTOI(tndp->ni_dvp);
xp = NULL;
if (tndp->ni_vp)
xp = VTOI(tndp->ni_vp);
/*
* 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().
*/
if (oldparent != dp->i_number)
newparent = dp->i_number;
if (doingdirectory && newparent) {
VOP_LOCK(fndp->ni_vp);
error = ufs_access(fndp->ni_vp, VWRITE, tndp->ni_cred);
VOP_UNLOCK(fndp->ni_vp);
if (error)
goto bad;
tndp->ni_nameiop = RENAME | LOCKPARENT | LOCKLEAF | NOCACHE;
do {
dp = VTOI(tndp->ni_dvp);
if (xp != NULL)
iput(xp);
if (error = checkpath(ip, dp, tndp->ni_cred))
goto out;
if (error = namei(tndp))
goto out;
xp = NULL;
if (tndp->ni_vp)
xp = VTOI(tndp->ni_vp);
} while (dp != VTOI(tndp->ni_dvp));
}
/*
* 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("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) {
dp->i_nlink++;
dp->i_flag |= ICHG;
error = iupdat(dp, &time, &time, 1);
}
if (error = direnter(ip, tndp))
goto out;
} else {
if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
panic("rename: EXDEV");
/*
* Short circuit rename(foo, foo).
*/
if (xp->i_number == ip->i_number)
panic("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 & ISVTX) && tndp->ni_cred->cr_uid != 0 &&
tndp->ni_cred->cr_uid != dp->i_uid &&
xp->i_uid != tndp->ni_cred->cr_uid) {
error = EPERM;
goto bad;
}
/*
* Target must be empty if a directory
* and have no links to it.
* Also, insure source and target are
* compatible (both directories, or both
* not directories).
*/
if ((xp->i_mode&IFMT) == IFDIR) {
if (!dirempty(xp, dp->i_number, tndp->ni_cred) ||
xp->i_nlink > 2) {
error = ENOTEMPTY;
goto bad;
}
if (!doingdirectory) {
error = ENOTDIR;
goto bad;
}
cache_purge(ITOV(dp));
} else if (doingdirectory) {
error = EISDIR;
goto bad;
}
if (error = dirrewrite(dp, ip, tndp))
goto bad;
vput(ITOV(dp));
/*
* 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("rename: linked directory");
error = itrunc(xp, (u_long)0, IO_SYNC);
}
xp->i_flag |= ICHG;
iput(xp);
xp = NULL;
}
/*
* 3) Unlink the source.
*/
fndp->ni_nameiop = DELETE | LOCKPARENT | LOCKLEAF;
(void)namei(fndp);
if (fndp->ni_vp != NULL) {
xp = VTOI(fndp->ni_vp);
dp = VTOI(fndp->ni_dvp);
} else {
if (fndp->ni_dvp != NULL)
vput(fndp->ni_dvp);
xp = NULL;
dp = NULL;
}
/*
* 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 IRENAME flag ensures that it cannot be moved by another
* rename.
*/
if (xp != ip) {
if (doingdirectory)
panic("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 |= ICHG;
error = vn_rdwr(UIO_READ, ITOV(xp), (caddr_t)&dirbuf,
sizeof (struct dirtemplate), (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED,
tndp->ni_cred, (int *)0);
if (error == 0) {
if (dirbuf.dotdot_namlen != 2 ||
dirbuf.dotdot_name[0] != '.' ||
dirbuf.dotdot_name[1] != '.') {
dirbad(xp, 12, "rename: mangled dir");
} else {
dirbuf.dotdot_ino = newparent;
(void) vn_rdwr(UIO_WRITE, ITOV(xp),
(caddr_t)&dirbuf,
sizeof (struct dirtemplate),
(off_t)0, UIO_SYSSPACE,
IO_NODELOCKED|IO_SYNC,
tndp->ni_cred, (int *)0);
cache_purge(ITOV(dp));
}
}
}
error = dirremove(fndp);
if (!error) {
xp->i_nlink--;
xp->i_flag |= ICHG;
}
xp->i_flag &= ~IRENAME;
}
if (dp)
vput(ITOV(dp));
if (xp)
vput(ITOV(xp));
vrele(ITOV(ip));
return (error);
bad:
if (xp)
vput(ITOV(xp));
vput(ITOV(dp));
out:
ip->i_nlink--;
ip->i_flag |= ICHG;
vrele(ITOV(ip));
return (error);
}
/*
* A virgin directory (no blushing please).
*/
struct dirtemplate mastertemplate = {
0, 12, 1, ".",
0, DIRBLKSIZ - 12, 2, ".."
};
/*
* Mkdir system call
*/
ufs_mkdir(ndp, vap)
struct nameidata *ndp;
struct vattr *vap;
{
register struct inode *ip, *dp;
struct inode *tip;
struct vnode *dvp;
struct dirtemplate dirtemplate;
int error;
int dmode;
dvp = ndp->ni_dvp;
dp = VTOI(dvp);
dmode = vap->va_mode&0777;
dmode |= IFDIR;
/*
* Must simulate part of maknode here
* in order to acquire the inode, but
* not have it entered in the parent
* directory. The entry is made later
* after writing "." and ".." entries out.
*/
if (error = ialloc(dp, dirpref(dp->i_fs), dmode, ndp->ni_cred, &tip)) {
iput(dp);
return (error);
}
ip = tip;
ip->i_uid = ndp->ni_cred->cr_uid;
ip->i_gid = dp->i_gid;
#ifdef QUOTA
if ((error = getinoquota(ip)) ||
(error = chkiq(ip, 1, ndp->ni_cred, 0))) {
ifree(ip, ip->i_number, dmode);
iput(ip);
iput(dp);
return (error);
}
#endif
ip->i_flag |= IACC|IUPD|ICHG;
ip->i_mode = dmode;
ITOV(ip)->v_type = VDIR; /* Rest init'd in iget() */
ip->i_nlink = 2;
error = iupdat(ip, &time, &time, 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 |= ICHG;
error = iupdat(dp, &time, &time, 1);
/*
* Initialize directory with "."
* and ".." from static template.
*/
dirtemplate = mastertemplate;
dirtemplate.dot_ino = ip->i_number;
dirtemplate.dotdot_ino = dp->i_number;
error = vn_rdwr(UIO_WRITE, ITOV(ip), (caddr_t)&dirtemplate,
sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
IO_NODELOCKED|IO_SYNC, ndp->ni_cred, (int *)0);
if (error) {
dp->i_nlink--;
dp->i_flag |= ICHG;
goto bad;
}
if (DIRBLKSIZ > dp->i_fs->fs_fsize) {
panic("mkdir: blksize"); /* XXX - should grow w/balloc() */
} else {
ip->i_size = DIRBLKSIZ;
ip->i_flag |= ICHG;
}
/*
* Directory all set up, now
* install the entry for it in
* the parent directory.
*/
error = direnter(ip, ndp);
dp = NULL;
if (error) {
ndp->ni_nameiop = LOOKUP | NOCACHE;
error = namei(ndp);
if (!error) {
dp = VTOI(ndp->ni_vp);
dp->i_nlink--;
dp->i_flag |= ICHG;
}
}
bad:
/*
* No need to do an explicit itrunc here,
* vrele will do this for us because we set
* the link count to 0.
*/
if (error) {
ip->i_nlink = 0;
ip->i_flag |= ICHG;
iput(ip);
} else
ndp->ni_vp = ITOV(ip);
if (dp)
iput(dp);
return (error);
}
/*
* Rmdir system call.
*/
ufs_rmdir(ndp)
register struct nameidata *ndp;
{
register struct inode *ip, *dp;
int error = 0;
ip = VTOI(ndp->ni_vp);
dp = VTOI(ndp->ni_dvp);
/*
* No rmdir "." please.
*/
if (dp == ip) {
vrele(ITOV(dp));
iput(ip);
return (EINVAL);
}
/*
* 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.)
*/
if (ip->i_nlink != 2 || !dirempty(ip, dp->i_number, ndp->ni_cred)) {
error = ENOTEMPTY;
goto out;
}
/*
* Delete reference to directory before purging
* inode. If we crash in between, the directory
* will be reattached to lost+found,
*/
if (error = dirremove(ndp))
goto out;
dp->i_nlink--;
dp->i_flag |= ICHG;
cache_purge(ITOV(dp));
iput(dp);
ndp->ni_dvp = NULL;
/*
* 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 = itrunc(ip, (u_long)0, IO_SYNC);
cache_purge(ITOV(ip));
out:
if (ndp->ni_dvp)
iput(dp);
iput(ip);
return (error);
}
/*
* symlink -- make a symbolic link
*/
ufs_symlink(ndp, vap, target)
struct nameidata *ndp;
struct vattr *vap;
char *target;
{
struct inode *ip;
int error;
error = maknode(IFLNK | vap->va_mode, ndp, &ip);
if (error)
return (error);
error = vn_rdwr(UIO_WRITE, ITOV(ip), target, strlen(target), (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED, ndp->ni_cred, (int *)0);
iput(ip);
return (error);
}
/*
* Vnode op for read and write
*/
ufs_readdir(vp, uio, cred, eofflagp)
struct vnode *vp;
register struct uio *uio;
struct ucred *cred;
int *eofflagp;
{
int count, lost, error;
count = uio->uio_resid;
count &= ~(DIRBLKSIZ - 1);
lost = uio->uio_resid - count;
if (count < DIRBLKSIZ || (uio->uio_offset & (DIRBLKSIZ -1)))
return (EINVAL);
uio->uio_resid = count;
uio->uio_iov->iov_len = count;
error = ufs_read(vp, uio, 0, cred);
uio->uio_resid += lost;
if ((VTOI(vp)->i_size - uio->uio_offset) <= 0)
*eofflagp = 1;
else
*eofflagp = 0;
return (error);
}
/*
* Return target name of a symbolic link
*/
ufs_readlink(vp, uiop, cred)
struct vnode *vp;
struct uio *uiop;
struct ucred *cred;
{
return (ufs_read(vp, uiop, 0, cred));
}
/*
* Ufs abort op, called after namei() when a CREATE/DELETE isn't actually
* done. Nothing to do at the moment.
*/
/* ARGSUSED */
ufs_abortop(ndp)
struct nameidata *ndp;
{
return (0);
}
/*
* Lock an inode.
*/
ufs_lock(vp)
struct vnode *vp;
{
register struct inode *ip = VTOI(vp);
ILOCK(ip);
return (0);
}
/*
* Unlock an inode.
*/
ufs_unlock(vp)
struct vnode *vp;
{
register struct inode *ip = VTOI(vp);
if (!(ip->i_flag & ILOCKED))
panic("ufs_unlock NOT LOCKED");
IUNLOCK(ip);
return (0);
}
/*
* Check for a locked inode.
*/
ufs_islocked(vp)
struct vnode *vp;
{
if (VTOI(vp)->i_flag & ILOCKED)
return (1);
return (0);
}
/*
* Get access to bmap
*/
ufs_bmap(vp, bn, vpp, bnp)
struct vnode *vp;
daddr_t bn;
struct vnode **vpp;
daddr_t *bnp;
{
struct inode *ip = VTOI(vp);
if (vpp != NULL)
*vpp = ip->i_devvp;
if (bnp == NULL)
return (0);
return (bmap(ip, bn, bnp));
}
/*
* Calculate the logical to physical mapping if not done already,
* then call the device strategy routine.
*/
int checkoverlap = 0;
ufs_strategy(bp)
register struct buf *bp;
{
register struct inode *ip = VTOI(bp->b_vp);
struct vnode *vp;
int error;
if (bp->b_vp->v_type == VBLK || bp->b_vp->v_type == VCHR)
panic("ufs_strategy: spec");
if (bp->b_blkno == bp->b_lblkno) {
if (error = bmap(ip, bp->b_lblkno, &bp->b_blkno))
return (error);
if ((long)bp->b_blkno == -1)
clrbuf(bp);
}
if ((long)bp->b_blkno == -1) {
biodone(bp);
return (0);
}
#ifdef DIAGNOSTIC
if (checkoverlap) {
register struct buf *ep;
struct buf *ebp;
daddr_t start, last;
ebp = &buf[nbuf];
start = bp->b_blkno;
last = start + btodb(bp->b_bcount) - 1;
for (ep = buf; ep < ebp; ep++) {
if (ep == bp || (ep->b_flags & B_INVAL) ||
ep->b_vp == NULLVP)
continue;
if (VOP_BMAP(ep->b_vp, (daddr_t)0, &vp, (daddr_t)0))
continue;
if (vp != ip->i_devvp)
continue;
/* look for overlap */
if (ep->b_bcount == 0 || ep->b_blkno > last ||
ep->b_blkno + btodb(ep->b_bcount) <= start)
continue;
vprint("Disk overlap", vp);
printf("\tstart %d, end %d overlap start %d, end %d\n",
start, last, ep->b_blkno,
ep->b_blkno + btodb(ep->b_bcount) - 1);
panic("Disk buffer overlap");
}
}
#endif /* DIAGNOSTIC */
vp = ip->i_devvp;
bp->b_dev = vp->v_rdev;
(*(vp->v_op->vn_strategy))(bp);
return (0);
}
/*
* Print out the contents of an inode.
*/
ufs_print(vp)
struct vnode *vp;
{
register struct inode *ip = VTOI(vp);
printf("tag VT_UFS, ino %d, on dev %d, %d", ip->i_number,
major(ip->i_dev), minor(ip->i_dev));
#ifdef FIFO
if (vp->v_type == VFIFO)
fifo_printinfo(vp);
#endif /* FIFO */
printf("%s\n", (ip->i_flag & ILOCKED) ? " (LOCKED)" : "");
if (ip->i_spare0 == 0)
return;
printf("\towner pid %d", ip->i_spare0);
if (ip->i_spare1)
printf(" waiting pid %d", ip->i_spare1);
printf("\n");
}
/*
* Read wrapper for special devices.
*/
ufsspec_read(vp, uio, ioflag, cred)
struct vnode *vp;
struct uio *uio;
int ioflag;
struct ucred *cred;
{
/*
* Set access flag.
*/
VTOI(vp)->i_flag |= IACC;
return (spec_read(vp, uio, ioflag, cred));
}
/*
* Write wrapper for special devices.
*/
ufsspec_write(vp, uio, ioflag, cred)
struct vnode *vp;
struct uio *uio;
int ioflag;
struct ucred *cred;
{
/*
* Set update and change flags.
*/
VTOI(vp)->i_flag |= IUPD|ICHG;
return (spec_write(vp, uio, ioflag, cred));
}
/*
* Close wrapper for special devices.
*
* Update the times on the inode then do device close.
*/
ufsspec_close(vp, fflag, cred)
struct vnode *vp;
int fflag;
struct ucred *cred;
{
register struct inode *ip = VTOI(vp);
if (vp->v_usecount > 1 && !(ip->i_flag & ILOCKED))
ITIMES(ip, &time, &time);
return (spec_close(vp, fflag, cred));
}
#ifdef FIFO
/*
* Read wrapper for fifo's
*/
ufsfifo_read(vp, uio, ioflag, cred)
struct vnode *vp;
struct uio *uio;
int ioflag;
struct ucred *cred;
{
/*
* Set access flag.
*/
VTOI(vp)->i_flag |= IACC;
return (fifo_read(vp, uio, ioflag, cred));
}
/*
* Write wrapper for fifo's.
*/
ufsfifo_write(vp, uio, ioflag, cred)
struct vnode *vp;
struct uio *uio;
int ioflag;
struct ucred *cred;
{
/*
* Set update and change flags.
*/
VTOI(vp)->i_flag |= IUPD|ICHG;
return (fifo_write(vp, uio, ioflag, cred));
}
/*
* Close wrapper for fifo's.
*
* Update the times on the inode then do device close.
*/
ufsfifo_close(vp, fflag, cred)
struct vnode *vp;
int fflag;
struct ucred *cred;
{
register struct inode *ip = VTOI(vp);
if (vp->v_usecount > 1 && !(ip->i_flag & ILOCKED))
ITIMES(ip, &time, &time);
return (fifo_close(vp, fflag, cred));
}
#endif /* FIFO */
/*
* Make a new file.
*/
maknode(mode, ndp, ipp)
int mode;
register struct nameidata *ndp;
struct inode **ipp;
{
register struct inode *ip;
struct inode *tip;
register struct inode *pdir = VTOI(ndp->ni_dvp);
ino_t ipref;
int error;
*ipp = 0;
if ((mode & IFMT) == 0)
mode |= IFREG;
if ((mode & IFMT) == IFDIR)
ipref = dirpref(pdir->i_fs);
else
ipref = pdir->i_number;
if (error = ialloc(pdir, ipref, mode, ndp->ni_cred, &tip)) {
iput(pdir);
return (error);
}
ip = tip;
ip->i_uid = ndp->ni_cred->cr_uid;
ip->i_gid = pdir->i_gid;
#ifdef QUOTA
if ((error = getinoquota(ip)) ||
(error = chkiq(ip, 1, ndp->ni_cred, 0))) {
ifree(ip, ip->i_number, mode);
iput(ip);
iput(pdir);
return (error);
}
#endif
ip->i_flag |= IACC|IUPD|ICHG;
ip->i_mode = mode;
ITOV(ip)->v_type = IFTOVT(mode); /* Rest init'd in iget() */
ip->i_nlink = 1;
if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, ndp->ni_cred) &&
suser(ndp->ni_cred, NULL))
ip->i_mode &= ~ISGID;
/*
* Make sure inode goes to disk before directory entry.
*/
if (error = iupdat(ip, &time, &time, 1))
goto bad;
if (error = direnter(ip, ndp)) {
pdir = NULL;
goto bad;
}
*ipp = ip;
return (0);
bad:
/*
* Write error occurred trying to update the inode
* or the directory so must deallocate the inode.
*/
if (pdir)
iput(pdir);
ip->i_nlink = 0;
ip->i_flag |= ICHG;
iput(ip);
return (error);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.