freebsd-dev/sys/fs/pseudofs/pseudofs_vnops.c
Jeff Roberson 4d93c0be1f - Use vrefcnt() where it is safe to do so instead of doing direct and
unlocked accesses to v_usecount.
 - Lock access to the buf lists in the various sync routines.  interlock
   locking could be avoided almost entirely in leaf filesystems if the
   fsync function had a generic helper.
2002-09-25 02:32:42 +00:00

891 lines
21 KiB
C

/*-
* Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
* All rights reserved.
*
* 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
* in this position and unchanged.
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $FreeBSD$
*/
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/ctype.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/lock.h>
#include <sys/mac.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/sbuf.h>
#include <sys/sx.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <fs/pseudofs/pseudofs.h>
#include <fs/pseudofs/pseudofs_internal.h>
#if 0
#define PFS_TRACE(foo) \
do { \
printf("pseudofs: %s(): line %d: ", __func__, __LINE__); \
printf foo ; \
printf("\n"); \
} while (0)
#define PFS_RETURN(err) \
do { \
printf("pseudofs: %s(): line %d: returning %d\n", \
__func__, __LINE__, err); \
return (err); \
} while (0)
#else
#define PFS_TRACE(foo) \
do { /* nothing */ } while (0)
#define PFS_RETURN(err) \
return (err)
#endif
/*
* Returns non-zero if given file is visible to given process
*/
static int
pfs_visible(struct thread *td, struct pfs_node *pn, pid_t pid)
{
struct proc *proc;
int r;
PFS_TRACE(("%s (pid: %d, req: %d)",
pn->pn_name, pid, td->td_proc->p_pid));
if (pn->pn_flags & PFS_DISABLED)
PFS_RETURN (0);
r = 1;
if (pid != NO_PID) {
if ((proc = pfind(pid)) == NULL)
PFS_RETURN (0);
if (p_cansee(td, proc) != 0 ||
(pn->pn_vis != NULL && !(pn->pn_vis)(td, proc, pn)))
r = 0;
PROC_UNLOCK(proc);
}
PFS_RETURN (r);
}
/*
* Verify permissions
*/
static int
pfs_access(struct vop_access_args *va)
{
struct vnode *vn = va->a_vp;
struct vattr vattr;
int error;
PFS_TRACE((((struct pfs_vdata *)vn->v_data)->pvd_pn->pn_name));
error = VOP_GETATTR(vn, &vattr, va->a_cred, va->a_td);
if (error)
PFS_RETURN (error);
error = vaccess(vn->v_type, vattr.va_mode, vattr.va_uid,
vattr.va_gid, va->a_mode, va->a_cred, NULL);
PFS_RETURN (error);
}
/*
* Close a file or directory
*/
static int
pfs_close(struct vop_close_args *va)
{
struct vnode *vn = va->a_vp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pn = pvd->pvd_pn;
struct proc *proc;
int error;
PFS_TRACE((pn->pn_name));
/*
* Do nothing unless this is the last close and the node has a
* last-close handler.
*/
if (vrefcnt(vn) > 1 || pn->pn_close == NULL)
PFS_RETURN (0);
if (pvd->pvd_pid != NO_PID)
proc = pfind(pvd->pvd_pid);
else
proc = NULL;
error = (pn->pn_close)(va->a_td, proc, pn);
if (proc != NULL)
PROC_UNLOCK(proc);
PFS_RETURN (error);
}
/*
* Get file attributes
*/
static int
pfs_getattr(struct vop_getattr_args *va)
{
struct vnode *vn = va->a_vp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pn = pvd->pvd_pn;
struct vattr *vap = va->a_vap;
struct proc *proc;
int error = 0;
PFS_TRACE((pn->pn_name));
VATTR_NULL(vap);
vap->va_type = vn->v_type;
vap->va_fileid = pn->pn_fileno;
vap->va_flags = 0;
vap->va_blocksize = PAGE_SIZE;
vap->va_bytes = vap->va_size = 0;
vap->va_fsid = vn->v_mount->mnt_stat.f_fsid.val[0];
vap->va_nlink = 1;
nanotime(&vap->va_ctime);
vap->va_atime = vap->va_mtime = vap->va_ctime;
switch (pn->pn_type) {
case pfstype_procdir:
case pfstype_root:
case pfstype_dir:
vap->va_mode = 0555;
break;
case pfstype_file:
case pfstype_symlink:
vap->va_mode = 0444;
break;
default:
printf("shouldn't be here!\n");
vap->va_mode = 0;
break;
}
if (pvd->pvd_pid != NO_PID) {
if ((proc = pfind(pvd->pvd_pid)) == NULL)
PFS_RETURN (ENOENT);
vap->va_uid = proc->p_ucred->cr_ruid;
vap->va_gid = proc->p_ucred->cr_rgid;
if (pn->pn_attr != NULL)
error = (pn->pn_attr)(va->a_td, proc, pn, vap);
PROC_UNLOCK(proc);
} else {
vap->va_uid = 0;
vap->va_gid = 0;
}
PFS_RETURN (error);
}
/*
* Perform an ioctl
*/
static int
pfs_ioctl(struct vop_ioctl_args *va)
{
struct vnode *vn = va->a_vp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pn = pvd->pvd_pn;
struct proc *proc = NULL;
int error;
PFS_TRACE(("%s: %lx", pn->pn_name, va->a_command));
if (vn->v_type != VREG)
PFS_RETURN (EINVAL);
if (pn->pn_ioctl == NULL)
PFS_RETURN (ENOTTY);
/*
* This is necessary because either process' privileges may
* have changed since the open() call.
*/
if (!pfs_visible(curthread, pn, pvd->pvd_pid))
PFS_RETURN (EIO);
/* XXX duplicates bits of pfs_visible() */
if (pvd->pvd_pid != NO_PID) {
if ((proc = pfind(pvd->pvd_pid)) == NULL)
PFS_RETURN (EIO);
_PHOLD(proc);
PROC_UNLOCK(proc);
}
error = (pn->pn_ioctl)(curthread, proc, pn, va->a_command, va->a_data);
if (proc != NULL)
PRELE(proc);
PFS_RETURN (error);
}
/*
* Perform getextattr
*/
static int
pfs_getextattr(struct vop_getextattr_args *va)
{
struct vnode *vn = va->a_vp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pn = pvd->pvd_pn;
struct proc *proc = NULL;
int error;
PFS_TRACE((pd->pn_name));
if (pn->pn_getextattr == NULL)
PFS_RETURN (EOPNOTSUPP);
/*
* This is necessary because either process' privileges may
* have changed since the open() call.
*/
if (!pfs_visible(curthread, pn, pvd->pvd_pid))
PFS_RETURN (EIO);
/* XXX duplicates bits of pfs_visible() */
if (pvd->pvd_pid != NO_PID) {
if ((proc = pfind(pvd->pvd_pid)) == NULL)
PFS_RETURN (EIO);
_PHOLD(proc);
PROC_UNLOCK(proc);
}
error = (pn->pn_getextattr)(curthread, proc, pn, va->a_attrnamespace,
va->a_name, va->a_uio, va->a_size, va->a_cred);
if (proc != NULL)
PRELE(proc);
PFS_RETURN (error);
}
/*
* Look up a file or directory
*
* XXX NOTE! pfs_lookup() has been hooked into vop_lookup_desc! This
* will result in a lookup operation for a vnode which may already be
* cached, therefore we have to be careful to purge the VFS cache when
* reusing a vnode.
*
* This code will work, but is not really correct. Normally we would hook
* vfs_cache_lookup() into vop_lookup_desc and hook pfs_lookup() into
* vop_cachedlookup_desc.
*/
static int
pfs_lookup(struct vop_lookup_args *va)
{
struct vnode *vn = va->a_dvp;
struct vnode **vpp = va->a_vpp;
struct componentname *cnp = va->a_cnp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pd = pvd->pvd_pn;
struct pfs_node *pn, *pdn = NULL;
pid_t pid = pvd->pvd_pid;
int lockparent;
int wantparent;
char *pname;
int error, i, namelen;
PFS_TRACE(("%.*s", (int)cnp->cn_namelen, cnp->cn_nameptr));
cnp->cn_flags &= ~PDIRUNLOCK;
if (vn->v_type != VDIR)
PFS_RETURN (ENOTDIR);
/*
* Don't support DELETE or RENAME. CREATE is supported so
* that O_CREAT will work, but the lookup will still fail if
* the file does not exist.
*/
if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
PFS_RETURN (EOPNOTSUPP);
/* shortcut: check if the name is too long */
if (cnp->cn_namelen >= PFS_NAMELEN)
PFS_RETURN (ENOENT);
/* check that parent directory is visisble... */
if (!pfs_visible(curthread, pd, pvd->pvd_pid))
PFS_RETURN (ENOENT);
lockparent = cnp->cn_flags & LOCKPARENT;
wantparent = cnp->cn_flags & (LOCKPARENT | WANTPARENT);
/* self */
namelen = cnp->cn_namelen;
pname = cnp->cn_nameptr;
if (namelen == 1 && *pname == '.') {
pn = pd;
*vpp = vn;
VREF(vn);
PFS_RETURN (0);
}
/* parent */
if (cnp->cn_flags & ISDOTDOT) {
if (pd->pn_type == pfstype_root)
PFS_RETURN (EIO);
VOP_UNLOCK(vn, 0, cnp->cn_thread);
cnp->cn_flags |= PDIRUNLOCK;
KASSERT(pd->pn_parent, ("non-root directory has no parent"));
/*
* This one is tricky. Descendents of procdir nodes
* inherit their parent's process affinity, but
* there's no easy reverse mapping. For simplicity,
* we assume that if this node is a procdir, its
* parent isn't (which is correct as long as
* descendents of procdir nodes are never procdir
* nodes themselves)
*/
if (pd->pn_type == pfstype_procdir)
pid = NO_PID;
pn = pd->pn_parent;
goto got_pnode;
}
/* named node */
for (pn = pd->pn_nodes; pn != NULL; pn = pn->pn_next)
if (pn->pn_type == pfstype_procdir)
pdn = pn;
else if (pn->pn_name[namelen] == '\0'
&& bcmp(pname, pn->pn_name, namelen) == 0)
goto got_pnode;
/* process dependent node */
if ((pn = pdn) != NULL) {
pid = 0;
for (pid = 0, i = 0; i < namelen && isdigit(pname[i]); ++i)
if ((pid = pid * 10 + pname[i] - '0') > PID_MAX)
break;
if (i == cnp->cn_namelen)
goto got_pnode;
}
PFS_RETURN (ENOENT);
got_pnode:
if (pn != pd->pn_parent && !pn->pn_parent)
pn->pn_parent = pd;
if (!pfs_visible(curthread, pn, pvd->pvd_pid))
PFS_RETURN (ENOENT);
error = pfs_vncache_alloc(vn->v_mount, vpp, pn, pid);
if (error)
PFS_RETURN (error);
if ((cnp->cn_flags & ISDOTDOT) && (cnp->cn_flags & ISLASTCN)
&& lockparent) {
vn_lock(vn, LK_EXCLUSIVE|LK_RETRY, cnp->cn_thread);
cnp->cn_flags &= ~PDIRUNLOCK;
}
if (!lockparent || !(cnp->cn_flags & ISLASTCN))
VOP_UNLOCK(vn, 0, cnp->cn_thread);
/*
* XXX See comment at top of the routine.
*/
if (cnp->cn_flags & MAKEENTRY)
cache_enter(vn, *vpp, cnp);
PFS_RETURN (0);
}
/*
* Open a file or directory.
*/
static int
pfs_open(struct vop_open_args *va)
{
struct vnode *vn = va->a_vp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pn = pvd->pvd_pn;
int mode = va->a_mode;
PFS_TRACE(("%s (mode 0x%x)", pn->pn_name, mode));
/*
* check if the file is visible to the caller
*
* XXX Not sure if this is necessary, as the VFS system calls
* XXX pfs_lookup() and pfs_access() first, and pfs_lookup()
* XXX calls pfs_visible(). There's a race condition here, but
* XXX calling pfs_visible() from here doesn't really close it,
* XXX and the only consequence of that race is an EIO further
* XXX down the line.
*/
if (!pfs_visible(va->a_td, pn, pvd->pvd_pid))
PFS_RETURN (ENOENT);
/* check if the requested mode is permitted */
if (((mode & FREAD) && !(mode & PFS_RD)) ||
((mode & FWRITE) && !(mode & PFS_WR)))
PFS_RETURN (EPERM);
/* we don't support locking */
if ((mode & O_SHLOCK) || (mode & O_EXLOCK))
PFS_RETURN (EOPNOTSUPP);
PFS_RETURN (0);
}
/*
* Read from a file
*/
static int
pfs_read(struct vop_read_args *va)
{
struct vnode *vn = va->a_vp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pn = pvd->pvd_pn;
struct uio *uio = va->a_uio;
struct proc *proc = NULL;
struct sbuf *sb = NULL;
char *ps;
int error, xlen;
PFS_TRACE((pn->pn_name));
if (vn->v_type != VREG)
PFS_RETURN (EINVAL);
if (!(pn->pn_flags & PFS_RD))
PFS_RETURN (EBADF);
if (pn->pn_func == NULL)
PFS_RETURN (EIO);
/*
* This is necessary because either process' privileges may
* have changed since the open() call.
*/
if (!pfs_visible(curthread, pn, pvd->pvd_pid))
PFS_RETURN (EIO);
/* XXX duplicates bits of pfs_visible() */
if (pvd->pvd_pid != NO_PID) {
if ((proc = pfind(pvd->pvd_pid)) == NULL)
PFS_RETURN (EIO);
_PHOLD(proc);
PROC_UNLOCK(proc);
}
if (pn->pn_flags & PFS_RAWRD) {
error = (pn->pn_func)(curthread, proc, pn, NULL, uio);
if (proc != NULL)
PRELE(proc);
PFS_RETURN (error);
}
sb = sbuf_new(sb, NULL, uio->uio_offset + uio->uio_resid, 0);
if (sb == NULL) {
if (proc != NULL)
PRELE(proc);
PFS_RETURN (EIO);
}
error = (pn->pn_func)(curthread, proc, pn, sb, uio);
if (proc != NULL)
PRELE(proc);
if (error) {
sbuf_delete(sb);
PFS_RETURN (error);
}
/* XXX we should possibly detect and handle overflows */
sbuf_finish(sb);
ps = sbuf_data(sb) + uio->uio_offset;
xlen = sbuf_len(sb) - uio->uio_offset;
xlen = imin(xlen, uio->uio_resid);
error = (xlen <= 0 ? 0 : uiomove(ps, xlen, uio));
sbuf_delete(sb);
PFS_RETURN (error);
}
/*
* Iterate through directory entries
*/
static int
pfs_iterate(struct thread *td, pid_t pid, struct pfs_node *pd,
struct pfs_node **pn, struct proc **p)
{
if ((*pn) == NULL)
*pn = pd->pn_nodes;
else
again:
if ((*pn)->pn_type != pfstype_procdir)
*pn = (*pn)->pn_next;
while (*pn != NULL && (*pn)->pn_type == pfstype_procdir) {
if (*p == NULL)
*p = LIST_FIRST(&allproc);
else
*p = LIST_NEXT(*p, p_list);
if (*p != NULL)
break;
*pn = (*pn)->pn_next;
}
if ((*pn) == NULL)
return (-1);
if (!pfs_visible(td, *pn, *p ? (*p)->p_pid : pid))
goto again;
return (0);
}
/*
* Return directory entries.
*/
static int
pfs_readdir(struct vop_readdir_args *va)
{
struct vnode *vn = va->a_vp;
struct pfs_info *pi = (struct pfs_info *)vn->v_mount->mnt_data;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pd = pvd->pvd_pn;
pid_t pid = pvd->pvd_pid;
struct pfs_node *pn;
struct dirent entry;
struct uio *uio;
struct proc *p;
off_t offset;
int error, i, resid;
PFS_TRACE((pd->pn_name));
if (vn->v_type != VDIR)
PFS_RETURN (ENOTDIR);
uio = va->a_uio;
/* check if the directory is visible to the caller */
if (!pfs_visible(curthread, pd, pid))
PFS_RETURN (ENOENT);
/* only allow reading entire entries */
offset = uio->uio_offset;
resid = uio->uio_resid;
if (offset < 0 || offset % PFS_DELEN != 0 || resid < PFS_DELEN)
PFS_RETURN (EINVAL);
/* skip unwanted entries */
sx_slock(&allproc_lock);
for (pn = NULL, p = NULL; offset > 0; offset -= PFS_DELEN)
if (pfs_iterate(curthread, pid, pd, &pn, &p) == -1) {
/* nothing left... */
sx_sunlock(&allproc_lock);
PFS_RETURN (0);
}
/* fill in entries */
entry.d_reclen = PFS_DELEN;
while (pfs_iterate(curthread, pid, pd, &pn, &p) != -1 && resid > 0) {
if (!pn->pn_parent)
pn->pn_parent = pd;
if (!pn->pn_fileno)
pfs_fileno_alloc(pi, pn);
if (pid != NO_PID)
entry.d_fileno = pn->pn_fileno * NO_PID + pid;
else
entry.d_fileno = pn->pn_fileno;
/* PFS_DELEN was picked to fit PFS_NAMLEN */
for (i = 0; i < PFS_NAMELEN - 1 && pn->pn_name[i] != '\0'; ++i)
entry.d_name[i] = pn->pn_name[i];
entry.d_name[i] = 0;
entry.d_namlen = i;
switch (pn->pn_type) {
case pfstype_procdir:
KASSERT(p != NULL,
("reached procdir node with p == NULL"));
entry.d_fileno = pn->pn_fileno * NO_PID + p->p_pid;
entry.d_namlen = snprintf(entry.d_name,
PFS_NAMELEN, "%d", p->p_pid);
/* fall through */
case pfstype_root:
case pfstype_dir:
case pfstype_this:
case pfstype_parent:
entry.d_type = DT_DIR;
break;
case pfstype_file:
entry.d_type = DT_REG;
break;
case pfstype_symlink:
entry.d_type = DT_LNK;
break;
default:
sx_sunlock(&allproc_lock);
panic("%s has unexpected node type: %d", pn->pn_name, pn->pn_type);
}
PFS_TRACE((entry.d_name));
if ((error = uiomove((caddr_t)&entry, PFS_DELEN, uio))) {
sx_sunlock(&allproc_lock);
PFS_RETURN (error);
}
offset += PFS_DELEN;
resid -= PFS_DELEN;
}
sx_sunlock(&allproc_lock);
uio->uio_offset += offset;
PFS_RETURN (0);
}
/*
* Read a symbolic link
*/
static int
pfs_readlink(struct vop_readlink_args *va)
{
struct vnode *vn = va->a_vp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pn = pvd->pvd_pn;
struct uio *uio = va->a_uio;
struct proc *proc = NULL;
char buf[MAXPATHLEN], *ps;
struct sbuf sb;
int error, xlen;
PFS_TRACE((pn->pn_name));
if (vn->v_type != VLNK)
PFS_RETURN (EINVAL);
if (pn->pn_func == NULL)
PFS_RETURN (EIO);
if (pvd->pvd_pid != NO_PID) {
if ((proc = pfind(pvd->pvd_pid)) == NULL)
PFS_RETURN (EIO);
_PHOLD(proc);
PROC_UNLOCK(proc);
}
/* sbuf_new() can't fail with a static buffer */
sbuf_new(&sb, buf, sizeof buf, 0);
error = (pn->pn_func)(curthread, proc, pn, &sb, NULL);
if (proc != NULL)
PRELE(proc);
if (error) {
sbuf_delete(&sb);
PFS_RETURN (error);
}
/* XXX we should detect and handle overflows */
sbuf_finish(&sb);
ps = sbuf_data(&sb) + uio->uio_offset;
xlen = sbuf_len(&sb) - uio->uio_offset;
xlen = imin(xlen, uio->uio_resid);
error = (xlen <= 0 ? 0 : uiomove(ps, xlen, uio));
sbuf_delete(&sb);
PFS_RETURN (error);
}
/*
* Reclaim a vnode
*/
static int
pfs_reclaim(struct vop_reclaim_args *va)
{
PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name));
return (pfs_vncache_free(va->a_vp));
}
#ifdef MAC
/*
* Refresh the vnode label as appropriate for the pseudo-file system.
*/
static int
pfs_refreshlabel(struct vop_refreshlabel_args *va)
{
struct vnode *vn = va->a_vp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pn = pvd->pvd_pn;
struct proc *proc = NULL;
int error;
PFS_TRACE((pd->pn_name));
if (pn->pn_refreshlabel == NULL) {
mac_update_vnode_from_mount(vn, vn->v_mount);
return (0);
}
/*
* This is necessary because either process' privileges may
* have changed since the last open() call.
*/
if (!pfs_visible(curthread, pn, pvd->pvd_pid))
PFS_RETURN (EIO);
/* XXX duplicate bits of pfs_visible() */
if (pvd->pvd_pid != NO_PID) {
if ((proc = pfind(pvd->pvd_pid)) == NULL)
PFS_RETURN (EIO);
_PHOLD(proc);
PROC_UNLOCK(proc);
}
error = (pn->pn_refreshlabel)(curthread, proc, vn, pn, va->a_cred);
if (proc != NULL)
PRELE(proc);
PFS_RETURN (error);
}
#endif
/*
* Set attributes
*/
static int
pfs_setattr(struct vop_setattr_args *va)
{
PFS_TRACE((((struct pfs_vdata *)va->a_vp->v_data)->pvd_pn->pn_name));
PFS_RETURN (EOPNOTSUPP);
}
/*
* Read from a file
*/
static int
pfs_write(struct vop_read_args *va)
{
struct vnode *vn = va->a_vp;
struct pfs_vdata *pvd = (struct pfs_vdata *)vn->v_data;
struct pfs_node *pn = pvd->pvd_pn;
struct uio *uio = va->a_uio;
struct proc *proc = NULL;
struct sbuf sb;
int error;
PFS_TRACE((pn->pn_name));
if (vn->v_type != VREG)
PFS_RETURN (EINVAL);
if (!(pn->pn_flags & PFS_WR))
PFS_RETURN (EBADF);
if (pn->pn_func == NULL)
PFS_RETURN (EIO);
/*
* This is necessary because either process' privileges may
* have changed since the open() call.
*/
if (!pfs_visible(curthread, pn, pvd->pvd_pid))
PFS_RETURN (EIO);
/* XXX duplicates bits of pfs_visible() */
if (pvd->pvd_pid != NO_PID) {
if ((proc = pfind(pvd->pvd_pid)) == NULL)
PFS_RETURN (EIO);
_PHOLD(proc);
PROC_UNLOCK(proc);
}
if (pn->pn_flags & PFS_RAWWR) {
error = (pn->pn_func)(curthread, proc, pn, NULL, uio);
if (proc != NULL)
PRELE(proc);
PFS_RETURN (error);
}
sbuf_uionew(&sb, uio, &error);
if (error)
PFS_RETURN (error);
error = (pn->pn_func)(curthread, proc, pn, &sb, uio);
if (proc != NULL)
PRELE(proc);
sbuf_delete(&sb);
PFS_RETURN (error);
}
/*
* Vnode operations
*/
vop_t **pfs_vnodeop_p;
static struct vnodeopv_entry_desc pfs_vnodeop_entries[] = {
{ &vop_default_desc, (vop_t *)vop_defaultop },
{ &vop_access_desc, (vop_t *)pfs_access },
{ &vop_close_desc, (vop_t *)pfs_close },
{ &vop_create_desc, (vop_t *)vop_eopnotsupp },
{ &vop_getattr_desc, (vop_t *)pfs_getattr },
{ &vop_getextattr_desc, (vop_t *)pfs_getextattr },
{ &vop_ioctl_desc, (vop_t *)pfs_ioctl },
{ &vop_link_desc, (vop_t *)vop_eopnotsupp },
{ &vop_lookup_desc, (vop_t *)pfs_lookup },
{ &vop_mkdir_desc, (vop_t *)vop_eopnotsupp },
{ &vop_mknod_desc, (vop_t *)vop_eopnotsupp },
{ &vop_open_desc, (vop_t *)pfs_open },
{ &vop_read_desc, (vop_t *)pfs_read },
{ &vop_readdir_desc, (vop_t *)pfs_readdir },
{ &vop_readlink_desc, (vop_t *)pfs_readlink },
{ &vop_reclaim_desc, (vop_t *)pfs_reclaim },
#ifdef MAC
{ &vop_refreshlabel_desc, (vop_t *)pfs_refreshlabel },
#endif
{ &vop_remove_desc, (vop_t *)vop_eopnotsupp },
{ &vop_rename_desc, (vop_t *)vop_eopnotsupp },
{ &vop_rmdir_desc, (vop_t *)vop_eopnotsupp },
{ &vop_setattr_desc, (vop_t *)pfs_setattr },
{ &vop_symlink_desc, (vop_t *)vop_eopnotsupp },
{ &vop_write_desc, (vop_t *)pfs_write },
{ &vop_lock_desc, (vop_t *)vop_stdlock },
{ &vop_unlock_desc, (vop_t *)vop_stdunlock },
{ &vop_islocked_desc, (vop_t *)vop_stdislocked},
/* XXX I've probably forgotten a few that need vop_eopnotsupp */
{ NULL, (vop_t *)NULL }
};
static struct vnodeopv_desc pfs_vnodeop_opv_desc =
{ &pfs_vnodeop_p, pfs_vnodeop_entries };
VNODEOP_SET(pfs_vnodeop_opv_desc);