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Staging: Pohmelfs: Added IO permissions and priorities.

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Signed-off-by: Evgeniy Polyakov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Evgeniy Polyakov 2009-03-27 15:04:29 +03:00 • committed by Greg Kroah-Hartman
commit e0ca873916
5 changed files with 86 additions and 32 deletions
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61
drivers/staging/pohmelfs/config.c
View file

@ -81,6 +81,45 @@ static struct pohmelfs_config_group *pohmelfs_find_create_config_group(unsigned
return g;
}
static inline void pohmelfs_insert_config_entry(struct pohmelfs_sb *psb, struct pohmelfs_config *dst)
{
struct pohmelfs_config *tmp;
INIT_LIST_HEAD(&dst->config_entry);
list_for_each_entry(tmp, &psb->state_list, config_entry) {
if (dst->state.ctl.prio > tmp->state.ctl.prio)
list_add_tail(&dst->config_entry, &tmp->config_entry);
}
if (list_empty(&dst->config_entry))
list_add_tail(&dst->config_entry, &psb->state_list);
}
static int pohmelfs_move_config_entry(struct pohmelfs_sb *psb,
struct pohmelfs_config *dst, struct pohmelfs_config *new)
{
if ((dst->state.ctl.prio == new->state.ctl.prio) &&
(dst->state.ctl.perm == new->state.ctl.perm))
return 0;
dprintk("%s: dst: prio: %d, perm: %x, new: prio: %d, perm: %d.\n",
__func__, dst->state.ctl.prio, dst->state.ctl.perm,
new->state.ctl.prio, new->state.ctl.perm);
dst->state.ctl.prio = new->state.ctl.prio;
dst->state.ctl.perm = new->state.ctl.perm;
list_del_init(&dst->config_entry);
pohmelfs_insert_config_entry(psb, dst);
return 0;
}
/*
* pohmelfs_copy_config() is used to copy new state configs from the
* config group (controlled by the netlink messages) into the superblock.
* This happens either at startup time where no transactions can access
* the list of the configs (and thus list of the network states), or at
* run-time, where it is protected by the psb->state_lock.
*/
int pohmelfs_copy_config(struct pohmelfs_sb *psb)
{
struct pohmelfs_config_group *g;
@ -103,7 +142,9 @@ int pohmelfs_copy_config(struct pohmelfs_sb *psb)
err = 0;
list_for_each_entry(dst, &psb->state_list, config_entry) {
if (pohmelfs_config_eql(&dst->state.ctl, &c->state.ctl)) {
err = -EEXIST;
err = pohmelfs_move_config_entry(psb, dst, c);
if (!err)
err = -EEXIST;
break;
}
}
@ -119,7 +160,7 @@ int pohmelfs_copy_config(struct pohmelfs_sb *psb)
memcpy(&dst->state.ctl, &c->state.ctl, sizeof(struct pohmelfs_ctl));
list_add_tail(&dst->config_entry, &psb->state_list);
pohmelfs_insert_config_entry(psb, dst);
err = pohmelfs_state_init_one(psb, dst);
if (err) {
@ -248,6 +289,13 @@ out_unlock:
return err;
}
static int pohmelfs_modify_config(struct pohmelfs_ctl *old, struct pohmelfs_ctl *new)
{
old->perm = new->perm;
old->prio = new->prio;
return 0;
}
static int pohmelfs_cn_ctl(struct cn_msg *msg, int action)
{
struct pohmelfs_config_group *g;
@ -278,6 +326,9 @@ static int pohmelfs_cn_ctl(struct cn_msg *msg, int action)
g->num_entry--;
kfree(c);
goto out_unlock;
} else if (action == POHMELFS_FLAGS_MODIFY) {
err = pohmelfs_modify_config(sc, ctl);
goto out_unlock;
} else {
err = -EEXIST;
goto out_unlock;
@ -296,6 +347,7 @@ static int pohmelfs_cn_ctl(struct cn_msg *msg, int action)
}
memcpy(&c->state.ctl, ctl, sizeof(struct pohmelfs_ctl));
g->num_entry++;
list_add_tail(&c->config_entry, &g->config_list);
out_unlock:
@ -401,10 +453,9 @@ static void pohmelfs_cn_callback(void *data)
switch (msg->flags) {
case POHMELFS_FLAGS_ADD:
err = pohmelfs_cn_ctl(msg, POHMELFS_FLAGS_ADD);
break;
case POHMELFS_FLAGS_DEL:
err = pohmelfs_cn_ctl(msg, POHMELFS_FLAGS_DEL);
case POHMELFS_FLAGS_MODIFY:
err = pohmelfs_cn_ctl(msg, msg->flags);
break;
case POHMELFS_FLAGS_SHOW:
err = pohmelfs_cn_disp(msg);

1
drivers/staging/pohmelfs/netfs.h
View file

@ -87,6 +87,7 @@ enum {
POHMELFS_FLAGS_DEL, /* Network state control message for DEL */
POHMELFS_FLAGS_SHOW, /* Network state control message for SHOW */
POHMELFS_FLAGS_CRYPTO, /* Crypto data control message */
POHMELFS_FLAGS_MODIFY, /* Network state modification message */
};
/*

30
drivers/staging/pohmelfs/trans.c
View file

@ -456,34 +456,22 @@ int netfs_trans_finish_send(struct netfs_trans *t, struct pohmelfs_sb *psb)
__func__, t, t->gen, t->iovec.iov_len, t->page_num, psb->active_state);
#endif
mutex_lock(&psb->state_lock);
if ((t->flags & NETFS_TRANS_SINGLE_DST) && psb->active_state) {
st = &psb->active_state->state;
err = -EPIPE;
if (netfs_state_poll(st) & POLLOUT) {
err = netfs_trans_push_dst(t, st);
if (!err) {
err = netfs_trans_send(t, st);
if (err) {
netfs_trans_drop_last(t, st);
} else {
pohmelfs_switch_active(psb);
goto out;
}
}
}
pohmelfs_switch_active(psb);
}
list_for_each_entry(c, &psb->state_list, config_entry) {
st = &c->state;
if (t->flags & NETFS_TRANS_SINGLE_DST) {
if (!(st->ctl.perm & POHMELFS_IO_PERM_READ))
continue;
} else {
if (!(st->ctl.perm & POHMELFS_IO_PERM_WRITE))
continue;
}
err = netfs_trans_push(t, st);
if (!err && (t->flags & NETFS_TRANS_SINGLE_DST))
break;
}
out:
mutex_unlock(&psb->state_lock);
#if 0
dprintk("%s: fully sent t: %p, gen: %u, size: %u, page_num: %u, err: %d.\n",