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authorEvgeniy Polyakov <zbr@ioremap.net>2009-03-27 15:04:29 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2009-04-17 11:06:30 -0700
commite0ca87391694dfacd01465d5c01c579c3b8b63e0 (patch)
tree7d295aa23034586fd7374b3e614e0844d39f351e /drivers/staging/pohmelfs
parentf2739de19176009b14475207d5418cd79e7f0ba3 (diff)
Staging: Pohmelfs: Added IO permissions and priorities.
Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/pohmelfs')
-rw-r--r--drivers/staging/pohmelfs/config.c61
-rw-r--r--drivers/staging/pohmelfs/netfs.h1
-rw-r--r--drivers/staging/pohmelfs/trans.c30
3 files changed, 66 insertions, 26 deletions
diff --git a/drivers/staging/pohmelfs/config.c b/drivers/staging/pohmelfs/config.c
index 3e67da9ea381..a6eaa42fb669 100644
--- a/drivers/staging/pohmelfs/config.c
+++ b/drivers/staging/pohmelfs/config.c
@@ -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);
diff --git a/drivers/staging/pohmelfs/netfs.h b/drivers/staging/pohmelfs/netfs.h
index 7700e2bf3cc7..c78cfcb042fb 100644
--- a/drivers/staging/pohmelfs/netfs.h
+++ b/drivers/staging/pohmelfs/netfs.h
@@ -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 */
};
/*
diff --git a/drivers/staging/pohmelfs/trans.c b/drivers/staging/pohmelfs/trans.c
index b89f9f36b350..168fc8998c32 100644
--- a/drivers/staging/pohmelfs/trans.c
+++ b/drivers/staging/pohmelfs/trans.c
@@ -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",