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replace ufs_iput with vput; replace ILOCK and IUNLOCK with VOP_LOCK
[unix-history] / usr / src / sys / ufs / ufs / ufs_vnops.c
/*
* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*
* @(#)ufs_vnops.c 7.111 (Berkeley) %G%
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <vm/vm.h>
#include <miscfs/specfs/specdev.h>
#include <ufs/ufs/lockf.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
static int ufs_chmod __P((struct vnode *, int, struct ucred *, struct proc *));
static int ufs_chown
__P((struct vnode *, uid_t, gid_t, struct ucred *, struct proc *));
union _qcvt {
quad_t qcvt;
long val[2];
};
#define SETHIGH(q, h) { \
union _qcvt tmp; \
tmp.qcvt = (q); \
tmp.val[_QUAD_HIGHWORD] = (h); \
(q) = tmp.qcvt; \
}
#define SETLOW(q, l) { \
union _qcvt tmp; \
tmp.qcvt = (q); \
tmp.val[_QUAD_LOWWORD] = (l); \
(q) = tmp.qcvt; \
}
/*
* Create a regular file
*/
int
ufs_create(ap)
struct vop_create_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
int error;
if (error =
ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
ap->a_dvp, ap->a_vpp, ap->a_cnp))
return (error);
return (0);
}
/*
* Mknod vnode call
*/
/* ARGSUSED */
int
ufs_mknod(ap)
struct vop_mknod_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
register struct vattr *vap = ap->a_vap;
register struct vnode **vpp = ap->a_vpp;
register struct inode *ip;
int error;
if (error =
ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
ap->a_dvp, vpp, ap->a_cnp))
return (error);
ip = VTOI(*vpp);
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.
*/
vput(*vpp);
(*vpp)->v_type = VNON;
vgone(*vpp);
*vpp = 0;
return (0);
}
/*
* Open called.
*
* Nothing to do.
*/
/* ARGSUSED */
int
ufs_open(ap)
struct vop_open_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
return (0);
}
/*
* Close called
*
* Update the times on the inode.
*/
/* ARGSUSED */
int
ufs_close(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
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.
*/
int
ufs_access(ap)
struct vop_access_args /* {
struct vnode *a_vp;
int a_mode;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct inode *ip = VTOI(vp);
register struct ucred *cred = ap->a_cred;
mode_t mode = ap->a_mode;
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:
;
}
return ((ip->i_mode & mode) == mode ? 0 : EACCES);
}
/* ARGSUSED */
int
ufs_getattr(ap)
struct vop_getattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct inode *ip = VTOI(vp);
register struct vattr *vap = ap->a_vap;
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;
vap->va_size = ip->i_din.di_size;
vap->va_atime = ip->i_atime;
vap->va_mtime = ip->i_mtime;
vap->va_ctime = ip->i_ctime;
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 = vp->v_mount->mnt_stat.f_iosize;
vap->va_bytes = dbtob(ip->i_blocks);
vap->va_type = vp->v_type;
vap->va_filerev = ip->i_modrev;
return (0);
}
/*
* Set attribute vnode op. called from several syscalls
*/
int
ufs_setattr(ap)
struct vop_setattr_args /* {
struct vnode *a_vp;
struct vattr *a_vap;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct vattr *vap = ap->a_vap;
register struct vnode *vp = ap->a_vp;
register struct inode *ip = VTOI(vp);
register struct ucred *cred = ap->a_cred;
register struct proc *p = ap->a_p;
struct timeval atimeval, mtimeval;
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);
}
/*
* Go through the fields and update iff not VNOVAL.
*/
if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL)
if (error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred, p))
return (error);
if (vap->va_size != VNOVAL) {
if (vp->v_type == VDIR)
return (EISDIR);
if (error = VOP_TRUNCATE(vp, vap->va_size, 0, cred, p))
return (error);
}
ip = VTOI(vp);
if (vap->va_atime.ts_sec != VNOVAL || vap->va_mtime.ts_sec != VNOVAL) {
if (cred->cr_uid != ip->i_uid &&
(error = suser(cred, &p->p_acflag)))
return (error);
if (vap->va_atime.ts_sec != VNOVAL)
ip->i_flag |= IACC;
if (vap->va_mtime.ts_sec != VNOVAL)
ip->i_flag |= IUPD | ICHG;
atimeval.tv_sec = vap->va_atime.ts_sec;
atimeval.tv_usec = vap->va_atime.ts_nsec / 1000;
mtimeval.tv_sec = vap->va_mtime.ts_sec;
mtimeval.tv_usec = vap->va_mtime.ts_nsec / 1000;
if (error = VOP_UPDATE(vp, &atimeval, &mtimeval, 1))
return (error);
}
error = 0;
if (vap->va_mode != (mode_t)VNOVAL)
error = ufs_chmod(vp, (int)vap->va_mode, cred, p);
if (vap->va_flags != VNOVAL) {
if (cred->cr_uid != ip->i_uid &&
(error = suser(cred, &p->p_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.
*/
static int
ufs_chmod(vp, mode, cred, p)
register struct vnode *vp;
register int mode;
register struct ucred *cred;
struct proc *p;
{
register struct inode *ip = VTOI(vp);
int error;
if (cred->cr_uid != ip->i_uid &&
(error = suser(cred, &p->p_acflag)))
return (error);
if (cred->cr_uid) {
if (vp->v_type != VDIR && (mode & ISVTX))
return (EFTYPE);
if (!groupmember(ip->i_gid, cred) && (mode & ISGID))
return (EPERM);
}
ip->i_mode &= ~07777;
ip->i_mode |= mode & 07777;
ip->i_flag |= ICHG;
if ((vp->v_flag & VTEXT) && (ip->i_mode & ISVTX) == 0)
(void) vnode_pager_uncache(vp);
return (0);
}
/*
* Perform chown operation on inode ip;
* inode must be locked prior to call.
*/
static int
ufs_chown(vp, uid, gid, cred, p)
register struct vnode *vp;
uid_t uid;
gid_t gid;
struct ucred *cred;
struct proc *p;
{
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 == (uid_t)VNOVAL)
uid = ip->i_uid;
if (gid == (gid_t)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, &p->p_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);
}
/* ARGSUSED */
int
ufs_ioctl(ap)
struct vop_ioctl_args /* {
struct vnode *a_vp;
int a_command;
caddr_t a_data;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
return (ENOTTY);
}
/* ARGSUSED */
int
ufs_select(ap)
struct vop_select_args /* {
struct vnode *a_vp;
int a_which;
int a_fflags;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
/*
* We should really check to see if I/O is possible.
*/
return (1);
}
/*
* Mmap a file
*
* NB Currently unsupported.
*/
/* ARGSUSED */
int
ufs_mmap(ap)
struct vop_mmap_args /* {
struct vnode *a_vp;
int a_fflags;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
return (EINVAL);
}
/*
* Seek on a file
*
* Nothing to do, so just return.
*/
/* ARGSUSED */
int
ufs_seek(ap)
struct vop_seek_args /* {
struct vnode *a_vp;
off_t a_oldoff;
off_t a_newoff;
struct ucred *a_cred;
} */ *ap;
{
return (0);
}
/*
* ufs remove
* Hard to avoid races here, especially
* in unlinking directories.
*/
int
ufs_remove(ap)
struct vop_remove_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap;
{
register struct inode *ip;
register struct vnode *vp = ap->a_vp;
register struct vnode *dvp = ap->a_dvp;
int error;
ip = VTOI(vp);
error = ufs_dirremove(dvp, ap->a_cnp);
if (!error) {
ip = VTOI(vp);
ip->i_nlink--;
ip->i_flag |= ICHG;
}
if (dvp == vp)
vrele(vp);
else
vput(vp);
vput(dvp);
return (error);
}
/*
* link vnode call
*/
int
ufs_link(ap)
struct vop_link_args /* {
struct vnode *a_vp;
struct vnode *a_tdvp;
struct componentname *a_cnp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct vnode *tdvp = ap->a_tdvp;
register struct componentname *cnp = ap->a_cnp;
register struct inode *ip;
struct timeval tv;
int error;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_link: no name");
#endif
if (vp->v_mount != tdvp->v_mount) {
VOP_ABORTOP(vp, cnp);
error = EXDEV;
goto out2;
}
if (vp != tdvp && (error = VOP_LOCK(tdvp))) {
VOP_ABORTOP(vp, cnp);
goto out2;
}
ip = VTOI(tdvp);
if ((nlink_t)ip->i_nlink >= LINK_MAX) {
VOP_ABORTOP(vp, cnp);
error = EMLINK;
goto out1;
}
ip->i_nlink++;
ip->i_flag |= ICHG;
tv = time;
error = VOP_UPDATE(tdvp, &tv, &tv, 1);
if (!error)
error = ufs_direnter(ip, vp, cnp);
if (error) {
ip->i_nlink--;
ip->i_flag |= ICHG;
}
FREE(cnp->cn_pnbuf, M_NAMEI);
out1:
if (vp != tdvp)
VOP_UNLOCK(tdvp);
out2:
vput(vp);
return (error);
}
/*
* relookup - lookup a path name component
* Used by lookup to re-aquire things.
*/
int
relookup(dvp, vpp, cnp)
struct vnode *dvp, **vpp;
struct componentname *cnp;
{
register struct vnode *dp = 0; /* the directory we are searching */
struct vnode *tdp; /* saved dp */
struct mount *mp; /* mount table entry */
int docache; /* == 0 do not cache last component */
int wantparent; /* 1 => wantparent or lockparent flag */
int rdonly; /* lookup read-only flag bit */
char *cp; /* DEBUG: check name ptr/len */
int newhash; /* DEBUG: check name hash */
int error = 0;
/*
* Setup: break out flag bits into variables.
*/
wantparent = cnp->cn_flags & (LOCKPARENT|WANTPARENT);
docache = (cnp->cn_flags & NOCACHE) ^ NOCACHE;
if (cnp->cn_nameiop == DELETE ||
(wantparent && cnp->cn_nameiop != CREATE))
docache = 0;
rdonly = cnp->cn_flags & RDONLY;
cnp->cn_flags &= ~ISSYMLINK;
dp = dvp;
VOP_LOCK(dp);
/* dirloop: */
/*
* Search a new directory.
*
* The cn_hash value is for use by vfs_cache.
* The last component of the filename is left accessible via
* cnp->cn_nameptr for callers that need the name. Callers needing
* the name set the SAVENAME flag. When done, they assume
* responsibility for freeing the pathname buffer.
*/
#ifdef NAMEI_DIAGNOSTIC
for (newhash = 0, cp = cnp->cn_nameptr; *cp != 0 && *cp != '/'; cp++)
newhash += (unsigned char)*cp;
if (newhash != cnp->cn_hash)
panic("relookup: bad hash");
if (cnp->cn_namelen != cp - cnp->cn_nameptr)
panic ("relookup: bad len");
if (*cp != 0)
panic("relookup: not last component");
printf("{%s}: ", cnp->cn_nameptr);
#endif
/*
* Check for degenerate name (e.g. / or "")
* which is a way of talking about a directory,
* e.g. like "/." or ".".
*/
if (cnp->cn_nameptr[0] == '\0') {
if (cnp->cn_nameiop != LOOKUP || wantparent) {
error = EISDIR;
goto bad;
}
if (dp->v_type != VDIR) {
error = ENOTDIR;
goto bad;
}
if (!(cnp->cn_flags & LOCKLEAF))
VOP_UNLOCK(dp);
*vpp = dp;
if (cnp->cn_flags & SAVESTART)
panic("lookup: SAVESTART");
return (0);
}
if (cnp->cn_flags & ISDOTDOT)
panic ("relookup: lookup on dot-dot");
/*
* We now have a segment name to search for, and a directory to search.
*/
if (error = VOP_LOOKUP(dp, vpp, cnp)) {
#ifdef DIAGNOSTIC
if (*vpp != NULL)
panic("leaf should be empty");
#endif
if (error != EJUSTRETURN)
goto bad;
/*
* If creating and at end of pathname, then can consider
* allowing file to be created.
*/
if (rdonly || (dvp->v_mount->mnt_flag & MNT_RDONLY)) {
error = EROFS;
goto bad;
}
/* ASSERT(dvp == ndp->ni_startdir) */
if (cnp->cn_flags & SAVESTART)
VREF(dvp);
/*
* We return with ni_vp NULL to indicate that the entry
* doesn't currently exist, leaving a pointer to the
* (possibly locked) directory inode in ndp->ni_dvp.
*/
return (0);
}
dp = *vpp;
#ifdef DIAGNOSTIC
/*
* Check for symbolic link
*/
if (dp->v_type == VLNK && (cnp->cn_flags & FOLLOW))
panic ("relookup: symlink found.\n");
#endif
nextname:
/*
* Check for read-only file systems.
*/
if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) {
/*
* Disallow directory write attempts on read-only
* file systems.
*/
if (rdonly || (dp->v_mount->mnt_flag & MNT_RDONLY) ||
(wantparent &&
(dvp->v_mount->mnt_flag & MNT_RDONLY))) {
error = EROFS;
goto bad2;
}
}
/* ASSERT(dvp == ndp->ni_startdir) */
if (cnp->cn_flags & SAVESTART)
VREF(dvp);
if (!wantparent)
vrele(dvp);
if ((cnp->cn_flags & LOCKLEAF) == 0)
VOP_UNLOCK(dp);
return (0);
bad2:
if ((cnp->cn_flags & LOCKPARENT) && (cnp->cn_flags & ISLASTCN))
VOP_UNLOCK(dvp);
vrele(dvp);
bad:
vput(dp);
*vpp = NULL;
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.
*/
int
ufs_rename(ap)
struct vop_rename_args /* {
struct vnode *a_fdvp;
struct vnode *a_fvp;
struct componentname *a_fcnp;
struct vnode *a_tdvp;
struct vnode *a_tvp;
struct componentname *a_tcnp;
} */ *ap;
{
struct vnode *tvp = ap->a_tvp;
register struct vnode *tdvp = ap->a_tdvp;
struct vnode *fvp = ap->a_fvp;
register struct vnode *fdvp = ap->a_fdvp;
register struct componentname *tcnp = ap->a_tcnp;
register struct componentname *fcnp = ap->a_fcnp;
register struct inode *ip, *xp, *dp;
struct dirtemplate dirbuf;
struct timeval tv;
int doingdirectory = 0, oldparent = 0, newparent = 0;
int error = 0;
int fdvpneedsrele = 1, tdvpneedsrele = 1;
u_char namlen;
#ifdef DIAGNOSTIC
if ((tcnp->cn_flags & HASBUF) == 0 ||
(fcnp->cn_flags & HASBUF) == 0)
panic("ufs_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:
VOP_ABORTOP(tdvp, tcnp); /* XXX, why not in NFS? */
if (tdvp == tvp)
vrele(tdvp);
else
vput(tdvp);
if (tvp)
vput(tvp);
VOP_ABORTOP(fdvp, fcnp); /* XXX, why not in NFS? */
vrele(fdvp);
vrele(fvp);
return (error);
}
/*
* Check if just deleting a link name.
*/
if (fvp == tvp) {
if (fvp->v_type == VDIR) {
error = EINVAL;
goto abortit;
}
VOP_ABORTOP(fdvp, fcnp);
vrele(fdvp);
vrele(fvp);
vput(tdvp);
vput(tvp);
tcnp->cn_flags &= ~MODMASK;
tcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
if ((tcnp->cn_flags & SAVESTART) == 0)
panic("ufs_rename: lost from startdir");
tcnp->cn_nameiop = DELETE;
(void) relookup(tdvp, &tvp, tcnp);
return (VOP_REMOVE(tdvp, tvp, tcnp));
}
if (error = VOP_LOCK(fvp))
goto abortit;
dp = VTOI(fdvp);
ip = VTOI(fvp);
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&ISDOTDOT) ||
(ip->i_flag & IRENAME)) {
VOP_UNLOCK(fvp);
error = EINVAL;
goto abortit;
}
ip->i_flag |= IRENAME;
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 |= ICHG;
tv = time;
if (error = VOP_UPDATE(fvp, &tv, &tv, 1)) {
VOP_UNLOCK(fvp);
goto bad;
}
/*
* If ".." must be changed (ie the directory gets a new
* parent) then the source directory must not be in the
* directory heirarchy above the target, as this would
* orphan everything below the source directory. Also
* the user must have write permission in the source so
* as to be able to change "..". We must repeat the call
* to namei, as the parent directory is unlocked by the
* call to checkpath().
*/
error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_proc);
VOP_UNLOCK(fvp);
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);
if (error = ufs_checkpath(ip, dp, tcnp->cn_cred))
goto out;
if ((tcnp->cn_flags & SAVESTART) == 0)
panic("ufs_rename: lost to startdir");
p->p_spare[1]--;
if (error = relookup(tdvp, &tvp, tcnp))
goto out;
dp = VTOI(tdvp);
xp = NULL;
if (tvp)
xp = VTOI(tvp);
}
/*
* 2) If target doesn't exist, link the target
* to the source and unlink the source.
* Otherwise, rewrite the target directory
* entry to reference the source inode and
* expunge the original entry's existence.
*/
if (xp == NULL) {
if (dp->i_dev != ip->i_dev)
panic("rename: EXDEV");
/*
* Account for ".." in new directory.
* When source and destination have the same
* parent we don't fool with the link count.
*/
if (doingdirectory && newparent) {
if ((nlink_t)dp->i_nlink >= LINK_MAX) {
error = EMLINK;
goto bad;
}
dp->i_nlink++;
dp->i_flag |= ICHG;
if (error = VOP_UPDATE(tdvp, &tv, &tv, 1))
goto bad;
}
if (error = ufs_direnter(ip, tdvp, tcnp)) {
if (doingdirectory && newparent) {
dp->i_nlink--;
dp->i_flag |= ICHG;
(void)VOP_UPDATE(tdvp, &tv, &tv, 1);
}
goto bad;
}
vput(tdvp);
} 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) && 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 (!ufs_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;
}
if (error = ufs_dirrewrite(dp, ip, tcnp))
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 |= ICHG;
}
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("rename: linked directory");
error = VOP_TRUNCATE(tvp, (off_t)0, IO_SYNC,
tcnp->cn_cred, tcnp->cn_proc);
}
xp->i_flag |= ICHG;
vput(tvp);
xp = NULL;
}
/*
* 3) Unlink the source.
*/
fcnp->cn_flags &= ~MODMASK;
fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
if ((fcnp->cn_flags & SAVESTART) == 0)
panic("ufs_rename: lost from startdir");
p->p_spare[1]--;
(void) relookup(fdvp, &fvp, fcnp);
if (fvp != NULL) {
xp = VTOI(fvp);
dp = VTOI(fdvp);
} else {
/*
* From name has disappeared.
*/
if (doingdirectory)
panic("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 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, fvp, (caddr_t)&dirbuf,
sizeof (struct dirtemplate), (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED,
tcnp->cn_cred, (int *)0, (struct proc *)0);
if (error == 0) {
# if (BYTE_ORDER == LITTLE_ENDIAN)
if (fvp->v_mount->mnt_maxsymlinklen <= 0)
namlen = dirbuf.dotdot_type;
else
namlen = dirbuf.dotdot_namlen;
# else
namlen = dirbuf.dotdot_namlen;
# endif
if (namlen != 2 ||
dirbuf.dotdot_name[0] != '.' ||
dirbuf.dotdot_name[1] != '.') {
ufs_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,
tcnp->cn_cred, (int *)0,
(struct proc *)0);
cache_purge(fdvp);
}
}
}
error = ufs_dirremove(fdvp, fcnp);
if (!error) {
xp->i_nlink--;
xp->i_flag |= ICHG;
}
xp->i_flag &= ~IRENAME;
}
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 (VOP_LOCK(fvp) == 0) {
ip->i_nlink--;
ip->i_flag |= ICHG;
vput(fvp);
} else
vrele(fvp);
return (error);
}
/*
* A virgin directory (no blushing please).
*/
static struct dirtemplate mastertemplate = {
0, 12, DT_DIR, 1, ".",
0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
};
static struct odirtemplate omastertemplate = {
0, 12, 1, ".",
0, DIRBLKSIZ - 12, 2, ".."
};
/*
* Mkdir system call
*/
int
ufs_mkdir(ap)
struct vop_mkdir_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
} */ *ap;
{
register struct vnode *dvp = ap->a_dvp;
register struct vattr *vap = ap->a_vap;
register struct componentname *cnp = ap->a_cnp;
register struct inode *ip, *dp;
struct vnode *tvp;
struct dirtemplate dirtemplate, *dtp;
struct timeval tv;
int error, dmode;
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_mkdir: no name");
#endif
dp = VTOI(dvp);
if ((nlink_t)dp->i_nlink >= LINK_MAX) {
free(cnp->cn_pnbuf, M_NAMEI);
vput(dvp);
return (EMLINK);
}
dmode = vap->va_mode&0777;
dmode |= IFDIR;
/*
* Must simulate part of maknode here to acquire the inode, but
* not have it entered in the parent directory. The entry is made
* later after writing "." and ".." entries.
*/
if (error = VOP_VALLOC(dvp, dmode, cnp->cn_cred, &tvp)) {
free(cnp->cn_pnbuf, M_NAMEI);
vput(dvp);
return (error);
}
ip = VTOI(tvp);
ip->i_uid = cnp->cn_cred->cr_uid;
ip->i_gid = dp->i_gid;
#ifdef QUOTA
if ((error = getinoquota(ip)) ||
(error = chkiq(ip, 1, cnp->cn_cred, 0))) {
free(cnp->cn_pnbuf, M_NAMEI);
VOP_VFREE(tvp, ip->i_number, dmode);
vput(tvp);
vput(dvp);
return (error);
}
#endif
ip->i_flag |= IACC|IUPD|ICHG;
ip->i_mode = dmode;
tvp->v_type = VDIR; /* Rest init'd in iget() */
ip->i_nlink = 2;
tv = time;
error = VOP_UPDATE(tvp, &tv, &tv, 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;
if (error = VOP_UPDATE(dvp, &tv, &tv, 1))
goto bad;
/* Initialize directory with "." and ".." from static template. */
if (dvp->v_mount->mnt_maxsymlinklen > 0)
dtp = &mastertemplate;
else
dtp = (struct dirtemplate *)&omastertemplate;
dirtemplate = *dtp;
dirtemplate.dot_ino = ip->i_number;
dirtemplate.dotdot_ino = dp->i_number;
error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
sizeof (dirtemplate), (off_t)0, UIO_SYSSPACE,
IO_NODELOCKED|IO_SYNC, cnp->cn_cred, (int *)0, (struct proc *)0);
if (error) {
dp->i_nlink--;
dp->i_flag |= ICHG;
goto bad;
}
if (DIRBLKSIZ > VFSTOUFS(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
panic("ufs_mkdir: blksize"); /* XXX should grow with balloc() */
else {
ip->i_size = DIRBLKSIZ;
ip->i_flag |= ICHG;
}
/* Directory set up, now install it's entry in the parent directory. */
if (error = ufs_direnter(ip, dvp, cnp)) {
dp->i_nlink--;
dp->i_flag |= ICHG;
}
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 |= ICHG;
vput(tvp);
} else
*ap->a_vpp = tvp;
FREE(cnp->cn_pnbuf, M_NAMEI);
vput(dvp);
return (error);
}
/*
* Rmdir system call.
*/
int
ufs_rmdir(ap)
struct vop_rmdir_args /* {
struct vnode *a_dvp;
struct vnode *a_vp;
struct componentname *a_cnp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct vnode *dvp = ap->a_dvp;
register struct componentname *cnp = ap->a_cnp;
register struct inode *ip, *dp;
int error;
ip = VTOI(vp);
dp = VTOI(dvp);
/*
* No rmdir "." please.
*/
if (dp == ip) {
vrele(dvp);
vput(vp);
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.)
*/
error = 0;
if (ip->i_nlink != 2 ||
!ufs_dirempty(ip, dp->i_number, cnp->cn_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 = ufs_dirremove(dvp, cnp))
goto out;
dp->i_nlink--;
dp->i_flag |= ICHG;
cache_purge(dvp);
vput(dvp);
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 = VOP_TRUNCATE(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
cnp->cn_proc);
cache_purge(ITOV(ip));
out:
if (dvp)
vput(dvp);
vput(vp);
return (error);
}
/*
* symlink -- make a symbolic link
*/
int
ufs_symlink(ap)
struct vop_symlink_args /* {
struct vnode *a_dvp;
struct vnode **a_vpp;
struct componentname *a_cnp;
struct vattr *a_vap;
char *a_target;
} */ *ap;
{
register struct vnode *vp, **vpp = ap->a_vpp;
register struct inode *ip;
int len, error;
if (error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
vpp, ap->a_cnp))
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 |= IUPD|ICHG;
} else
error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
UIO_SYSSPACE, IO_NODELOCKED, ap->a_cnp->cn_cred, (int *)0,
(struct proc *)0);
vput(vp);
return (error);
}
/*
* Vnode op for reading directories.
*
* The routine below assumes that the on-disk format of a directory
* is the same as that defined by <sys/dirent.h>. If the on-disk
* format changes, then it will be necessary to do a conversion
* from the on-disk format that read returns to the format defined
* by <sys/dirent.h>.
*/
int
ufs_readdir(ap)
struct vop_readdir_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
} */ *ap;
{
register struct uio *uio = ap->a_uio;
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;
# if (BYTE_ORDER == LITTLE_ENDIAN)
if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) {
error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
} else {
struct dirent *dp, *edp;
struct uio auio;
struct iovec aiov;
caddr_t dirbuf;
int readcnt;
u_char tmp;
auio = *uio;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_segflg = UIO_SYSSPACE;
aiov.iov_len = count;
MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK);
aiov.iov_base = dirbuf;
error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred);
if (error == 0) {
readcnt = count - auio.uio_resid;
edp = (struct dirent *)&dirbuf[readcnt];
for (dp = (struct dirent *)dirbuf; dp < edp; ) {
tmp = dp->d_namlen;
dp->d_namlen = dp->d_type;
dp->d_type = tmp;
if (dp->d_reclen > 0) {
dp = (struct dirent *)
((char *)dp + dp->d_reclen);
} else {
error = EIO;
break;
}
}
if (dp >= edp)
error = uiomove(dirbuf, readcnt, uio);
}
FREE(dirbuf, M_TEMP);
}
# else
error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
# endif
uio->uio_resid += lost;
return (error);
}
/*
* Return target name of a symbolic link
*/
int
ufs_readlink(ap)
struct vop_readlink_args /* {
struct vnode *a_vp;
struct uio *a_uio;
struct ucred *a_cred;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register 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));
}
/*
* Ufs abort op, called after namei() when a CREATE/DELETE isn't actually
* done. If a buffer has been saved in anticipation of a CREATE, delete it.
*/
/* ARGSUSED */
int
ufs_abortop(ap)
struct vop_abortop_args /* {
struct vnode *a_dvp;
struct componentname *a_cnp;
} */ *ap;
{
if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
FREE(ap->a_cnp->cn_pnbuf, M_NAMEI);
return (0);
}
/*
* Lock an inode. If its already locked, set the WANT bit and sleep.
*/
int
ufs_lock(ap)
struct vop_lock_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct vnode *vp = ap->a_vp;
register struct inode *ip;
struct proc *p = curproc; /* XXX */
start:
while (vp->v_flag & VXLOCK) {
vp->v_flag |= VXWANT;
sleep((caddr_t)vp, PINOD);
}
if (vp->v_tag == VT_NON)
return (ENOENT);
ip = VTOI(vp);
if (ip->i_flag & ILOCKED) {
ip->i_flag |= IWANT;
#ifdef DIAGNOSTIC
if (p) {
if (p->p_pid == ip->i_lockholder)
panic("locking against myself");
ip->i_lockwaiter = p->p_pid;
}
#endif
(void) sleep((caddr_t)ip, PINOD);
goto start;
}
#ifdef DIAGNOSTIC
ip->i_lockwaiter = 0;
if (p)
ip->i_lockholder = p->p_pid;
#endif
ip->i_flag |= ILOCKED;
return (0);
}
/*
* Unlock an inode. If WANT bit is on, wakeup.
*/
int
ufs_unlock(ap)
struct vop_unlock_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct inode *ip = VTOI(ap->a_vp);
if ((ip->i_flag & ILOCKED) == 0) {
vprint("ufs_unlock: unlocked inode", ap->a_vp);
panic("ufs_unlock NOT LOCKED");
}
#ifdef DIAGNOSTIC
ip->i_lockholder = 0;
#endif
ip->i_flag &= ~ILOCKED;
if (ip->i_flag & IWANT) {
ip->i_flag &= ~IWANT;
wakeup((caddr_t)ip);
}
return (0);
}
/*
* Check for a locked inode.
*/
int
ufs_islocked(ap)
struct vop_islocked_args /* {
struct vnode *a_vp;
} */ *ap;
{
if (VTOI(ap->a_vp)->i_flag & ILOCKED)
return (1);
return (0);
}
/*
* Calculate the logical to physical mapping if not done already,
* then call the device strategy routine.
*/
int
ufs_strategy(ap)
struct vop_strategy_args /* {
struct buf *a_bp;
} */ *ap;
{
register struct buf *bp = ap->a_bp;
register struct vnode *vp = bp->b_vp;
register struct inode *ip;
int error;
ip = VTOI(vp);
if (vp->v_type == VBLK || vp->v_type == VCHR)
panic("ufs_strategy: spec");
if (bp->b_blkno == bp->b_lblkno) {
if (error =
VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL)) {
bp->b_error = error;
bp->b_flags |= B_ERROR;
biodone(bp);
return (error);
}
if ((long)bp->b_blkno == -1)
clrbuf(bp);
}
if ((long)bp->b_blkno == -1) {
biodone(bp);
return (0);
}
vp = ip->i_devvp;
bp->b_dev = vp->v_rdev;
VOCALL (vp->v_op, VOFFSET(vop_strategy), ap);
return (0);
}
/*
* Print out the contents of an inode.
*/
int
ufs_print(ap)
struct vop_print_args /* {
struct vnode *a_vp;
} */ *ap;
{
register struct vnode *vp = ap->a_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_lockholder == 0)
return (0);
printf("\towner pid %d", ip->i_lockholder);
if (ip->i_lockwaiter)
printf(" waiting pid %d", ip->i_lockwaiter);
printf("\n");
return (0);
}
/*
* Read wrapper for special devices.
*/
int
ufsspec_read(ap)
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
/*
* Set access flag.
*/
VTOI(ap->a_vp)->i_flag |= IACC;
return (VOCALL (spec_vnodeop_p, VOFFSET(vop_read), ap));
}
/*
* Write wrapper for special devices.
*/
int
ufsspec_write(ap)
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
/*
* Set update and change flags.
*/
VTOI(ap->a_vp)->i_flag |= IUPD|ICHG;
return (VOCALL (spec_vnodeop_p, VOFFSET(vop_write), ap));
}
/*
* Close wrapper for special devices.
*
* Update the times on the inode then do device close.
*/
int
ufsspec_close(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
register struct inode *ip = VTOI(ap->a_vp);
if (ap->a_vp->v_usecount > 1 && !(ip->i_flag & ILOCKED))
ITIMES(ip, &time, &time);
return (VOCALL (spec_vnodeop_p, VOFFSET(vop_close), ap));
}
#ifdef FIFO
/*
* Read wrapper for fifo's
*/
int
ufsfifo_read(ap)
struct vop_read_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
extern int (**fifo_vnodeop_p)();
/*
* Set access flag.
*/
VTOI(ap->a_vp)->i_flag |= IACC;
return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_read), ap));
}
/*
* Write wrapper for fifo's.
*/
int
ufsfifo_write(ap)
struct vop_write_args /* {
struct vnode *a_vp;
struct uio *a_uio;
int a_ioflag;
struct ucred *a_cred;
} */ *ap;
{
extern int (**fifo_vnodeop_p)();
/*
* Set update and change flags.
*/
VTOI(ap->a_vp)->i_flag |= IUPD|ICHG;
return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_write), ap));
}
/*
* Close wrapper for fifo's.
*
* Update the times on the inode then do device close.
*/
ufsfifo_close(ap)
struct vop_close_args /* {
struct vnode *a_vp;
int a_fflag;
struct ucred *a_cred;
struct proc *a_p;
} */ *ap;
{
extern int (**fifo_vnodeop_p)();
register struct inode *ip = VTOI(ap->a_vp);
if (ap->a_vp->v_usecount > 1 && !(ip->i_flag & ILOCKED))
ITIMES(ip, &time, &time);
return (VOCALL (fifo_vnodeop_p, VOFFSET(vop_close), ap));
}
#endif /* FIFO */
/*
* Advisory record locking support
*/
int
ufs_advlock(ap)
struct vop_advlock_args /* {
struct vnode *a_vp;
caddr_t a_id;
int a_op;
struct flock *a_fl;
int a_flags;
} */ *ap;
{
register struct inode *ip = VTOI(ap->a_vp);
register struct flock *fl = ap->a_fl;
register struct lockf *lock;
off_t start, end;
int error;
/*
* Avoid the common case of unlocking when inode has no locks.
*/
if (ip->i_lockf == (struct lockf *)0) {
if (ap->a_op != F_SETLK) {
fl->l_type = F_UNLCK;
return (0);
}
}
/*
* Convert the flock structure into a start and end.
*/
switch (fl->l_whence) {
case SEEK_SET:
case SEEK_CUR:
/*
* Caller is responsible for adding any necessary offset
* when SEEK_CUR is used.
*/
start = fl->l_start;
break;
case SEEK_END:
start = ip->i_size + fl->l_start;
break;
default:
return (EINVAL);
}
if (start < 0)
return (EINVAL);
if (fl->l_len == 0)
end = -1;
else
end = start + fl->l_len - 1;
/*
* Create the lockf structure
*/
MALLOC(lock, struct lockf *, sizeof *lock, M_LOCKF, M_WAITOK);
lock->lf_start = start;
lock->lf_end = end;
lock->lf_id = ap->a_id;
lock->lf_inode = ip;
lock->lf_type = fl->l_type;
lock->lf_next = (struct lockf *)0;
lock->lf_block = (struct lockf *)0;
lock->lf_flags = ap->a_flags;
/*
* Do the requested operation.
*/
switch(ap->a_op) {
case F_SETLK:
return (lf_setlock(lock));
case F_UNLCK:
error = lf_clearlock(lock);
FREE(lock, M_LOCKF);
return (error);
case F_GETLK:
error = lf_getlock(lock, fl);
FREE(lock, M_LOCKF);
return (error);
default:
free(lock, M_LOCKF);
return (EINVAL);
}
/* NOTREACHED */
}
/*
* Initialize the vnode associated with a new inode, handle aliased
* vnodes.
*/
int
ufs_vinit(mntp, specops, fifoops, vpp)
struct mount *mntp;
int (**specops)();
int (**fifoops)();
struct vnode **vpp;
{
struct inode *ip;
struct vnode *vp, *nvp;
vp = *vpp;
ip = VTOI(vp);
switch(vp->v_type = IFTOVT(ip->i_mode)) {
case VCHR:
case VBLK:
vp->v_op = specops;
if (nvp = checkalias(vp, ip->i_rdev, mntp)) {
/*
* Discard unneeded vnode, but save its inode.
*/
ufs_ihashrem(ip);
VOP_UNLOCK(vp);
nvp->v_data = vp->v_data;
vp->v_data = NULL;
vp->v_op = spec_vnodeop_p;
vrele(vp);
vgone(vp);
/*
* Reinitialize aliased inode.
*/
vp = nvp;
ip->i_vnode = vp;
ufs_ihashins(ip);
}
break;
case VFIFO:
#ifdef FIFO
vp->v_op = fifoops;
break;
#else
return (EOPNOTSUPP);
#endif
}
if (ip->i_number == ROOTINO)
vp->v_flag |= VROOT;
/*
* Initialize modrev times
*/
SETHIGH(ip->i_modrev, mono_time.tv_sec);
SETLOW(ip->i_modrev, mono_time.tv_usec * 4294);
*vpp = vp;
return (0);
}
/*
* Allocate a new inode.
*/
int
ufs_makeinode(mode, dvp, vpp, cnp)
int mode;
struct vnode *dvp;
struct vnode **vpp;
struct componentname *cnp;
{
register struct inode *ip, *pdir;
struct timeval tv;
struct vnode *tvp;
int error;
pdir = VTOI(dvp);
#ifdef DIAGNOSTIC
if ((cnp->cn_flags & HASBUF) == 0)
panic("ufs_makeinode: no name");
#endif
*vpp = NULL;
if ((mode & IFMT) == 0)
mode |= IFREG;
if (error = VOP_VALLOC(dvp, mode, cnp->cn_cred, &tvp)) {
free(cnp->cn_pnbuf, M_NAMEI);
vput(dvp);
return (error);
}
ip = VTOI(tvp);
ip->i_uid = cnp->cn_cred->cr_uid;
ip->i_gid = pdir->i_gid;
#ifdef QUOTA
if ((error = getinoquota(ip)) ||
(error = chkiq(ip, 1, cnp->cn_cred, 0))) {
free(cnp->cn_pnbuf, M_NAMEI);
VOP_VFREE(tvp, ip->i_number, mode);
vput(tvp);
vput(dvp);
return (error);
}
#endif
ip->i_flag |= IACC|IUPD|ICHG;
ip->i_mode = mode;
tvp->v_type = IFTOVT(mode); /* Rest init'd in iget() */
ip->i_nlink = 1;
if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
suser(cnp->cn_cred, NULL))
ip->i_mode &= ~ISGID;
/*
* Make sure inode goes to disk before directory entry.
*/
tv = time;
if (error = VOP_UPDATE(tvp, &tv, &tv, 1))
goto bad;
if (error = ufs_direnter(ip, dvp, cnp))
goto bad;
if ((cnp->cn_flags & SAVESTART) == 0)
FREE(cnp->cn_pnbuf, M_NAMEI);
vput(dvp);
*vpp = tvp;
return (0);
bad:
/*
* Write error occurred trying to update the inode
* or the directory so must deallocate the inode.
*/
free(cnp->cn_pnbuf, M_NAMEI);
vput(dvp);
ip->i_nlink = 0;
ip->i_flag |= ICHG;
vput(tvp);
return (error);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.