static void *
kobj_open_file_vnode(const char *file)
{
struct thread *td = curthread;
struct filedesc *fd;
struct nameidata nd;
int error, flags, vfslocked;
fd = td->td_proc->p_fd;
FILEDESC_XLOCK(fd);
if (fd->fd_rdir == NULL) {
fd->fd_rdir = rootvnode;
vref(fd->fd_rdir);
}
if (fd->fd_cdir == NULL) {
fd->fd_cdir = rootvnode;
vref(fd->fd_cdir);
}
FILEDESC_XUNLOCK(fd);
flags = FREAD | O_NOFOLLOW;
NDINIT(&nd, LOOKUP, MPSAFE, UIO_SYSSPACE, file, td);
error = vn_open_cred(&nd, &flags, 0, 0, curthread->td_ucred, NULL);
if (error != 0)
return (NULL);
vfslocked = NDHASGIANT(&nd);
NDFREE(&nd, NDF_ONLY_PNBUF);
/* We just unlock so we hold a reference. */
VOP_UNLOCK(nd.ni_vp, 0);
VFS_UNLOCK_GIANT(vfslocked);
return (nd.ni_vp);
}
int
alq_open_flags(struct alq **alqp, const char *file, struct ucred *cred, int cmode,
int size, int flags)
{
struct thread *td;
struct nameidata nd;
struct alq *alq;
int oflags;
int error;
int vfslocked;
KASSERT((size > 0), ("%s: size <= 0", __func__));
*alqp = NULL;
td = curthread;
NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE, UIO_SYSSPACE, file, td);
oflags = FWRITE | O_NOFOLLOW | O_CREAT;
error = vn_open_cred(&nd, &oflags, cmode, 0, cred, NULL);
if (error)
return (error);
vfslocked = NDHASGIANT(&nd);
NDFREE(&nd, NDF_ONLY_PNBUF);
/* We just unlock so we hold a reference */
VOP_UNLOCK(nd.ni_vp, 0);
VFS_UNLOCK_GIANT(vfslocked);
alq = bsd_malloc(sizeof(*alq), M_ALD, M_WAITOK|M_ZERO);
alq->aq_vp = nd.ni_vp;
alq->aq_cred = crhold(cred);
mtx_init(&alq->aq_mtx, "ALD Queue", NULL, MTX_SPIN|MTX_QUIET);
alq->aq_buflen = size;
alq->aq_entmax = 0;
alq->aq_entlen = 0;
alq->aq_freebytes = alq->aq_buflen;
alq->aq_entbuf = bsd_malloc(alq->aq_buflen, M_ALD, M_WAITOK|M_ZERO);
alq->aq_writehead = alq->aq_writetail = 0;
if (flags & ALQ_ORDERED)
alq->aq_flags |= AQ_ORDERED;
if ((error = ald_add(alq)) != 0) {
alq_destroy(alq);
return (error);
}
*alqp = alq;
return (0);
}
static void *
kobj_open_file_vnode(const char *file)
{
struct thread *td = curthread;
struct nameidata nd;
int error, flags;
pwd_ensure_dirs();
flags = FREAD | O_NOFOLLOW;
NDINIT(&nd, LOOKUP, 0, UIO_SYSSPACE, file, td);
error = vn_open_cred(&nd, &flags, 0, 0, curthread->td_ucred, NULL);
if (error != 0)
return (NULL);
NDFREE(&nd, NDF_ONLY_PNBUF);
/* We just unlock so we hold a reference. */
VOP_UNLOCK(nd.ni_vp, 0);
return (nd.ni_vp);
}
/*
* Open the lock fifo. If for any reason we don't find the fifo, it
* means that the lock daemon isn't running. Translate any missing
* file error message for the user, otherwise the application will
* complain that the user's file is missing, which isn't the case.
* Note that we use proc0's cred, so the fifo is opened as root.
*
* XXX: Note that this behavior is relative to the root directory
* of the current process, and this may result in a variety of
* {functional, security} problems in chroot() environments.
*/
NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, _PATH_LCKFIFO, td);
fmode = FFLAGS(O_WRONLY);
error = vn_open_cred(&nd, &fmode, 0, thread0.td_ucred);
if (error != 0) {
return (error == ENOENT ? EOPNOTSUPP : error);
}
wvp = nd.ni_vp;
VOP_UNLOCK(wvp, 0, td); /* vn_open leaves it locked */
ioflg = IO_UNIT | IO_NOMACCHECK;
for (;;) {
VOP_LEASE(wvp, td, thread0.td_ucred, LEASE_WRITE);
error = vn_rdwr(UIO_WRITE, wvp, (caddr_t)&msg, sizeof(msg), 0,
UIO_SYSSPACE, ioflg, thread0.td_ucred, NOCRED, NULL, td);
if (error && (((ioflg & IO_NDELAY) == 0) || error != EAGAIN)) {
/*
* Create the queue data structure, allocate the buffer, and open the file.
*/
int
alq_open(struct alq **alqp, const char *file, struct ucred *cred, int cmode,
int size, int count)
{
struct thread *td;
struct nameidata nd;
struct ale *ale;
struct ale *alp;
struct alq *alq;
char *bufp;
int flags;
int error;
int i, vfslocked;
*alqp = NULL;
td = curthread;
NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE, UIO_SYSSPACE, file, td);
flags = FWRITE | O_NOFOLLOW | O_CREAT;
error = vn_open_cred(&nd, &flags, cmode, 0, cred, NULL);
if (error)
return (error);
vfslocked = NDHASGIANT(&nd);
NDFREE(&nd, NDF_ONLY_PNBUF);
/* We just unlock so we hold a reference */
VOP_UNLOCK(nd.ni_vp, 0);
VFS_UNLOCK_GIANT(vfslocked);
alq = malloc(sizeof(*alq), M_ALD, M_WAITOK|M_ZERO);
alq->aq_entbuf = malloc(count * size, M_ALD, M_WAITOK|M_ZERO);
alq->aq_first = malloc(sizeof(*ale) * count, M_ALD, M_WAITOK|M_ZERO);
alq->aq_vp = nd.ni_vp;
alq->aq_cred = crhold(cred);
alq->aq_entmax = count;
alq->aq_entlen = size;
alq->aq_entfree = alq->aq_first;
mtx_init(&alq->aq_mtx, "ALD Queue", NULL, MTX_SPIN|MTX_QUIET);
bufp = alq->aq_entbuf;
ale = alq->aq_first;
alp = NULL;
/* Match up entries with buffers */
for (i = 0; i < count; i++) {
if (alp)
alp->ae_next = ale;
ale->ae_data = bufp;
alp = ale;
ale++;
bufp += size;
}
alp->ae_next = alq->aq_first;
if ((error = ald_add(alq)) != 0)
return (error);
*alqp = alq;
return (0);
}
