int
dm_get_mountinfo(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
size_t buflen,
void *bufp,
size_t *rlenp)
{
dm_fsreg_t *fsrp;
dm_tokdata_t *tdp;
int error;
int lc; /* lock cookie */
/* Make sure that the caller's buffer is 8-byte aligned. */
if (((__psint_t)bufp & (sizeof(__u64) - 1)) != 0)
return(EFAULT);
/* Verify that the handle is a filesystem handle, and that the
filesystem is capable of sending events. If not, return an error.
*/
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_VFS,
DM_RIGHT_SHARED, &tdp);
if (error != 0)
return(error);
/* Find the filesystem entry. This should always succeed as the
dm_app_get_tdp call created a filesystem reference. Once we find
the entry, drop the lock. The mountinfo message is never modified,
the filesystem entry can't disappear, and we don't want to hold a
spinlock while doing copyout calls.
*/
fsrp = dm_find_fsreg_and_lock((fsid_t*)&tdp->td_handle.ha_fsid, &lc);
if (fsrp == NULL) {
dm_app_put_tdp(tdp);
return(EINVAL);
}
mutex_spinunlock(&fsrp->fr_lock, lc);
/* Copy the message into the user's buffer and update his 'rlenp'. */
if (put_user(fsrp->fr_msgsize, rlenp)) {
error = EFAULT;
} else if (fsrp->fr_msgsize > buflen) { /* user buffer not big enough */
error = E2BIG;
} else if (copy_to_user(bufp, fsrp->fr_msg, fsrp->fr_msgsize)) {
error = EFAULT;
} else {
error = 0;
}
dm_app_put_tdp(tdp);
return(error);
}
int
dm_get_config_events(
void *hanp,
size_t hlen,
u_int nelem,
dm_eventset_t *eventsetp,
u_int *nelemp)
{
dm_fsys_vector_t *fsys_vector;
dm_tokdata_t *tdp;
int error;
/* Convert the handle into a vnode. */
if ((error = dm_get_config_tdp(hanp, hlen, &tdp)) != 0)
return(error);
/* Now call the filesystem-specific routine to determine the
events supported by that filesystem.
*/
VN_BHV_READ_LOCK(VN_BHV_HEAD(tdp->td_vp));
fsys_vector = dm_fsys_vector(tdp->td_vp);
error = fsys_vector->get_config_events(tdp->td_vp, tdp->td_right,
nelem, eventsetp, nelemp);
VN_BHV_READ_UNLOCK(VN_BHV_HEAD(tdp->td_vp));
dm_app_put_tdp(tdp);
return(error);
}
int
dm_symlink_by_handle(
dm_sessid_t sid,
void *dirhanp,
size_t dirhlen,
dm_token_t token,
void *hanp,
size_t hlen,
char *cname,
char *path)
{
dm_fsys_vector_t *fsys_vector;
dm_tokdata_t *tdp;
int error;
error = dm_app_get_tdp(sid, dirhanp, dirhlen, token, DM_TDT_DIR,
DM_RIGHT_EXCL, &tdp);
if (error != 0)
return(error);
fsys_vector = dm_fsys_vector(tdp->td_bdp);
error = fsys_vector->symlink_by_handle(tdp->td_bdp, tdp->td_right,
hanp, hlen, cname, path);
dm_app_put_tdp(tdp);
return(error);
}
int
dm_set_region(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
u_int nelem,
dm_region_t *regbufp,
dm_boolean_t *exactflagp)
{
dm_fsys_vector_t *fsys_vector;
dm_tokdata_t *tdp;
int error;
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_REG,
DM_RIGHT_EXCL, &tdp);
if (error != 0)
return(error);
VN_BHV_READ_LOCK(VN_BHV_HEAD(tdp->td_vp));
fsys_vector = dm_fsys_vector(tdp->td_vp);
error = fsys_vector->set_region(tdp->td_vp, tdp->td_right,
nelem, regbufp, exactflagp);
VN_BHV_READ_UNLOCK(VN_BHV_HEAD(tdp->td_vp));
dm_app_put_tdp(tdp);
return(error);
}
int
dm_get_config(
void *hanp,
size_t hlen,
dm_config_t flagname,
dm_size_t *retvalp)
{
dm_fsys_vector_t *fsys_vector;
dm_tokdata_t *tdp;
dm_size_t retval;
int system = 1;
int error;
/* Trap and process configuration parameters which are system-wide. */
switch (flagname) {
case DM_CONFIG_LEGACY:
case DM_CONFIG_PENDING:
case DM_CONFIG_OBJ_REF:
retval = DM_TRUE;
break;
case DM_CONFIG_MAX_MESSAGE_DATA:
retval = DM_MAX_MSG_DATA;
break;
default:
system = 0;
break;
}
if (system) {
#ifdef __sgi
if (copyout(&retval, retvalp, sizeof(retval)))
return(EFAULT);
#else
if (copy_to_user(retvalp, &retval, sizeof(retval)))
return(EFAULT);
#endif
return(0);
}
/* Must be filesystem-specific. Convert the handle into a vnode. */
if ((error = dm_get_config_tdp(hanp, hlen, &tdp)) != 0)
return(error);
/* Now call the filesystem-specific routine to determine the
value of the configuration option for that filesystem.
*/
fsys_vector = dm_fsys_vector(tdp->td_bdp);
error = fsys_vector->get_config(tdp->td_bdp, tdp->td_right,
flagname, retvalp);
dm_app_put_tdp(tdp);
return(error);
}
int
dm_get_eventlist(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
u_int nelem,
dm_eventset_t *eventsetp,
u_int *nelemp)
{
dm_fsys_vector_t *fsys_vector;
dm_tokdata_t *tdp;
dm_eventset_t eventset;
u_int elem;
int error;
if (nelem == 0)
return(EINVAL);
/* Access the specified object. */
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_ANY,
DM_RIGHT_SHARED, &tdp);
if (error != 0)
return(error);
/* Get the object's event list. */
fsys_vector = dm_fsys_vector(tdp->td_bdp);
error = fsys_vector->get_eventlist(tdp->td_bdp, tdp->td_right,
(tdp->td_type == DM_TDT_VFS ? DM_FSYS_OBJ : 0),
nelem, &eventset, &elem);
dm_app_put_tdp(tdp);
if (error)
return(error);
if (copy_to_user(eventsetp, &eventset, sizeof(eventset)))
return(EFAULT);
if (put_user(nelem, nelemp))
return(EFAULT);
return(0);
}
int
dm_set_eventlist(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
dm_eventset_t *eventsetp,
u_int maxevent)
{
dm_fsys_vector_t *fsys_vector;
dm_eventset_t eventset;
dm_tokdata_t *tdp;
int error;
if (copy_from_user(&eventset, eventsetp, sizeof(eventset)))
return(EFAULT);
/* Do some minor sanity checking. */
if (maxevent == 0 || maxevent > DM_EVENT_MAX)
return(EINVAL);
/* Access the specified object. */
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_ANY,
DM_RIGHT_EXCL, &tdp);
if (error != 0)
return(error);
fsys_vector = dm_fsys_vector(tdp->td_bdp);
error = fsys_vector->set_eventlist(tdp->td_bdp, tdp->td_right,
(tdp->td_type == DM_TDT_VFS ? DM_FSYS_OBJ : 0),
&eventset, maxevent);
dm_app_put_tdp(tdp);
return(error);
}
int
dm_set_return_on_destroy(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
dm_attrname_t *attrnamep,
dm_boolean_t enable)
{
dm_attrname_t attrname;
dm_tokdata_t *tdp;
dm_fsreg_t *fsrp;
dm_session_t *s;
int error;
int lc1; /* first lock cookie */
int lc2; /* second lock cookie */
/* If a dm_attrname_t is provided, copy it in and validate it. */
if (enable && (error = copy_from_user(&attrname, attrnamep, sizeof(attrname))) != 0)
return(error);
/* Validate the filesystem handle and use it to get the filesystem's
disposition structure.
*/
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_VFS,
DM_RIGHT_EXCL, &tdp);
if (error != 0)
return(error);
fsrp = dm_find_fsreg_and_lock((fsid_t*)&tdp->td_handle.ha_fsid, &lc1);
if (fsrp == NULL) {
dm_app_put_tdp(tdp);
return(EINVAL);
}
/* Now that we own 'fsrp->fr_lock', get the lock on the session so that
it can't disappear while we add it to the filesystem's event mask.
*/
if ((error = dm_find_session_and_lock(sid, &s, &lc2)) != 0) {
mutex_spinunlock(&fsrp->fr_lock, lc1);
dm_app_put_tdp(tdp);
return(error);
}
/* A caller cannot disable return-on-destroy if he is not registered
for DM_EVENT_DESTROY. Enabling return-on-destroy is an implicit
dm_set_disp() for DM_EVENT_DESTROY; we wake up all processes
waiting for a disposition in case any was waiting for a
DM_EVENT_DESTROY event.
*/
error = 0;
if (enable) {
fsrp->fr_sessp[DM_EVENT_DESTROY] = s;
fsrp->fr_rattr = attrname;
if (fsrp->fr_dispcnt)
sv_broadcast(&fsrp->fr_dispq);
} else if (fsrp->fr_sessp[DM_EVENT_DESTROY] != s) {
error = EINVAL;
} else {
bzero(&fsrp->fr_rattr, sizeof(fsrp->fr_rattr));
}
mutex_spinunlock(&s->sn_qlock, lc2); /* reverse cookie order */
mutex_spinunlock(&fsrp->fr_lock, lc1);
dm_app_put_tdp(tdp);
return(error);
}
int
dm_set_disp(
dm_sessid_t sid,
void *hanp,
size_t hlen,
dm_token_t token,
dm_eventset_t *eventsetp,
u_int maxevent)
{
dm_session_t *s;
dm_fsreg_t *fsrp;
dm_tokdata_t *tdp;
dm_eventset_t eventset;
int error;
int lc1; /* first lock cookie */
int lc2; /* second lock cookie */
u_int i;
/* Copy in and validate the event mask. Only the lower maxevent bits
are meaningful, so clear any bits set above maxevent.
*/
if (maxevent == 0 || maxevent > DM_EVENT_MAX)
return(EINVAL);
if (copy_from_user(&eventset, eventsetp, sizeof(eventset)))
return(EFAULT);
eventset &= (1 << maxevent) - 1;
/* If the caller specified the global handle, then the only valid token
is DM_NO_TOKEN, and the only valid event in the event mask is
DM_EVENT_MOUNT. If it is set, add the session to the list of
sessions that want to receive mount events. If it is clear, remove
the session from the list. Since DM_EVENT_MOUNT events never block
waiting for a session to register, there is noone to wake up if we
do add the session to the list.
*/
if (DM_GLOBALHAN(hanp, hlen)) {
if (token != DM_NO_TOKEN)
return(EINVAL);
if ((error = dm_find_session_and_lock(sid, &s, &lc1)) != 0)
return(error);
if (eventset == 0) {
s->sn_flags &= ~DM_SN_WANTMOUNT;
error = 0;
} else if (eventset == 1 << DM_EVENT_MOUNT) {
s->sn_flags |= DM_SN_WANTMOUNT;
error = 0;
} else {
error = EINVAL;
}
mutex_spinunlock(&s->sn_qlock, lc1);
return(error);
}
/* Since it's not the global handle, it had better be a filesystem
handle. Verify that the first 'maxevent' events in the event list
are all valid for a filesystem handle.
*/
if (eventset & ~DM_VALID_DISP_EVENTS)
return(EINVAL);
/* Verify that the session is valid, that the handle is a filesystem
handle, and that the filesystem is capable of sending events. (If
a dm_fsreg_t structure exists, then the filesystem can issue events.)
*/
error = dm_app_get_tdp(sid, hanp, hlen, token, DM_TDT_VFS,
DM_RIGHT_EXCL, &tdp);
if (error != 0)
return(error);
fsrp = dm_find_fsreg_and_lock((fsid_t*)&tdp->td_handle.ha_fsid, &lc1);
if (fsrp == NULL) {
dm_app_put_tdp(tdp);
return(EINVAL);
}
/* Now that we own 'fsrp->fr_lock', get the lock on the session so that
it can't disappear while we add it to the filesystem's event mask.
*/
if ((error = dm_find_session_and_lock(sid, &s, &lc2)) != 0) {
mutex_spinunlock(&fsrp->fr_lock, lc1);
dm_app_put_tdp(tdp);
return(error);
}
/* Update the event disposition array for this filesystem, adding
and/or removing the session as appropriate. If this session is
dropping registration for DM_EVENT_DESTROY, or is overriding some
other session's registration for DM_EVENT_DESTROY, then clear any
any attr-on-destroy attribute name also.
*/
for (i = 0; i < DM_EVENT_MAX; i++) {
if (DMEV_ISSET(i, eventset)) {
if (i == DM_EVENT_DESTROY && fsrp->fr_sessp[i] != s)
bzero(&fsrp->fr_rattr, sizeof(fsrp->fr_rattr));
fsrp->fr_sessp[i] = s;
} else if (fsrp->fr_sessp[i] == s) {
if (i == DM_EVENT_DESTROY)
bzero(&fsrp->fr_rattr, sizeof(fsrp->fr_rattr));
fsrp->fr_sessp[i] = NULL;
}
}
mutex_spinunlock(&s->sn_qlock, lc2); /* reverse cookie order */
/* Wake up all processes waiting for a disposition on this filesystem
in case any of them happen to be waiting for an event which we just
added.
*/
if (fsrp->fr_dispcnt)
sv_broadcast(&fsrp->fr_dispq);
mutex_spinunlock(&fsrp->fr_lock, lc1);
dm_app_put_tdp(tdp);
return(0);
}
