int
smb_vop_other_opens(vnode_t *vp, int mode)
{
return (((mode & FWRITE) && vn_has_other_opens(vp, V_WRITE)) ||
(((mode & FWRITE) == 0) && vn_is_opened(vp, V_WRITE)) ||
((mode & FREAD) && vn_has_other_opens(vp, V_READ)) ||
(((mode & FREAD) == 0) && vn_is_opened(vp, V_READ)) ||
vn_is_mapped(vp, V_RDORWR));
}
/*
* State support for delegation.
* Set the state delegation type for this state;
* This routine is called from open via rfs4_grant_delegation and the entry
* locks on sp and sp->rs_finfo are assumed.
*/
static rfs4_deleg_state_t *
rfs4_deleg_state(rfs4_state_t *sp, open_delegation_type4 dtype, int *recall)
{
rfs4_file_t *fp = sp->rs_finfo;
bool_t create = TRUE;
rfs4_deleg_state_t *dsp;
vnode_t *vp;
int open_prev = *recall;
int ret;
int fflags = 0;
ASSERT(rfs4_dbe_islocked(sp->rs_dbe));
ASSERT(rfs4_dbe_islocked(fp->rf_dbe));
/* Shouldn't happen */
if (fp->rf_dinfo.rd_recall_count != 0 ||
(fp->rf_dinfo.rd_dtype == OPEN_DELEGATE_READ &&
dtype != OPEN_DELEGATE_READ)) {
return (NULL);
}
/* Unlock to avoid deadlock */
rfs4_dbe_unlock(fp->rf_dbe);
rfs4_dbe_unlock(sp->rs_dbe);
dsp = rfs4_finddeleg(sp, &create);
rfs4_dbe_lock(sp->rs_dbe);
rfs4_dbe_lock(fp->rf_dbe);
if (dsp == NULL)
return (NULL);
/*
* It is possible that since we dropped the lock
* in order to call finddeleg, the rfs4_file_t
* was marked such that we should not grant a
* delegation, if so bail out.
*/
if (fp->rf_dinfo.rd_hold_grant > 0) {
rfs4_deleg_state_rele(dsp);
return (NULL);
}
if (create == FALSE) {
if (sp->rs_owner->ro_client == dsp->rds_client &&
dsp->rds_dtype == dtype) {
return (dsp);
} else {
rfs4_deleg_state_rele(dsp);
return (NULL);
}
}
/*
* Check that this file has not been delegated to another
* client
*/
if (fp->rf_dinfo.rd_recall_count != 0 ||
fp->rf_dinfo.rd_dtype == OPEN_DELEGATE_WRITE ||
(fp->rf_dinfo.rd_dtype == OPEN_DELEGATE_READ &&
dtype != OPEN_DELEGATE_READ)) {
rfs4_deleg_state_rele(dsp);
return (NULL);
}
vp = fp->rf_vp;
/* vnevent_support returns 0 if file system supports vnevents */
if (vnevent_support(vp, NULL)) {
rfs4_deleg_state_rele(dsp);
return (NULL);
}
/* Calculate the fflags for this OPEN. */
if (sp->rs_share_access & OPEN4_SHARE_ACCESS_READ)
fflags |= FREAD;
if (sp->rs_share_access & OPEN4_SHARE_ACCESS_WRITE)
fflags |= FWRITE;
*recall = 0;
/*
* Before granting a delegation we need to know if anyone else has
* opened the file in a conflicting mode. However, first we need to
* know how we opened the file to check the counts properly.
*/
if (dtype == OPEN_DELEGATE_READ) {
if (((fflags & FWRITE) && vn_has_other_opens(vp, V_WRITE)) ||
(((fflags & FWRITE) == 0) && vn_is_opened(vp, V_WRITE)) ||
vn_is_mapped(vp, V_WRITE)) {
if (open_prev) {
*recall = 1;
} else {
rfs4_deleg_state_rele(dsp);
return (NULL);
}
}
ret = fem_install(vp, deleg_rdops, (void *)fp, OPUNIQ,
rfs4_mon_hold, rfs4_mon_rele);
if (((fflags & FWRITE) && vn_has_other_opens(vp, V_WRITE)) ||
(((fflags & FWRITE) == 0) && vn_is_opened(vp, V_WRITE)) ||
vn_is_mapped(vp, V_WRITE)) {
if (open_prev) {
*recall = 1;
} else {
(void) fem_uninstall(vp, deleg_rdops,
(void *)fp);
rfs4_deleg_state_rele(dsp);
return (NULL);
}
}
/*
* Because a client can hold onto a delegation after the
* file has been closed, we need to keep track of the
* access to this file. Otherwise the CIFS server would
* not know about the client accessing the file and could
* inappropriately grant an OPLOCK.
* fem_install() returns EBUSY when asked to install a
* OPUNIQ monitor more than once. Therefore, check the
* return code because we only want this done once.
*/
if (ret == 0)
vn_open_upgrade(vp, FREAD);
} else { /* WRITE */
if (((fflags & FWRITE) && vn_has_other_opens(vp, V_WRITE)) ||
(((fflags & FWRITE) == 0) && vn_is_opened(vp, V_WRITE)) ||
((fflags & FREAD) && vn_has_other_opens(vp, V_READ)) ||
(((fflags & FREAD) == 0) && vn_is_opened(vp, V_READ)) ||
vn_is_mapped(vp, V_RDORWR)) {
if (open_prev) {
*recall = 1;
} else {
rfs4_deleg_state_rele(dsp);
return (NULL);
}
}
ret = fem_install(vp, deleg_wrops, (void *)fp, OPUNIQ,
rfs4_mon_hold, rfs4_mon_rele);
if (((fflags & FWRITE) && vn_has_other_opens(vp, V_WRITE)) ||
(((fflags & FWRITE) == 0) && vn_is_opened(vp, V_WRITE)) ||
((fflags & FREAD) && vn_has_other_opens(vp, V_READ)) ||
(((fflags & FREAD) == 0) && vn_is_opened(vp, V_READ)) ||
vn_is_mapped(vp, V_RDORWR)) {
if (open_prev) {
*recall = 1;
} else {
(void) fem_uninstall(vp, deleg_wrops,
(void *)fp);
rfs4_deleg_state_rele(dsp);
return (NULL);
}
}
/*
* Because a client can hold onto a delegation after the
* file has been closed, we need to keep track of the
* access to this file. Otherwise the CIFS server would
* not know about the client accessing the file and could
* inappropriately grant an OPLOCK.
* fem_install() returns EBUSY when asked to install a
* OPUNIQ monitor more than once. Therefore, check the
* return code because we only want this done once.
*/
if (ret == 0)
vn_open_upgrade(vp, FREAD|FWRITE);
}
/* Place on delegation list for file */
ASSERT(!list_link_active(&dsp->rds_node));
list_insert_tail(&fp->rf_delegstatelist, dsp);
dsp->rds_dtype = fp->rf_dinfo.rd_dtype = dtype;
/* Update delegation stats for this file */
fp->rf_dinfo.rd_time_lastgrant = gethrestime_sec();
/* reset since this is a new delegation */
fp->rf_dinfo.rd_conflicted_client = 0;
fp->rf_dinfo.rd_ever_recalled = FALSE;
if (dtype == OPEN_DELEGATE_READ)
fp->rf_dinfo.rd_rdgrants++;
else
fp->rf_dinfo.rd_wrgrants++;
return (dsp);
}
