diff options
author | Evgeniy Polyakov <zbr@ioremap.net> | 2009-03-27 12:04:29 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-04-17 18:06:30 (GMT) |
commit | e0ca87391694dfacd01465d5c01c579c3b8b63e0 (patch) | |
tree | 7d295aa23034586fd7374b3e614e0844d39f351e /drivers/staging | |
parent | f2739de19176009b14475207d5418cd79e7f0ba3 (diff) | |
download | linux-e0ca87391694dfacd01465d5c01c579c3b8b63e0.tar.xz |
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')
-rw-r--r-- | drivers/staging/pohmelfs/config.c | 61 | ||||
-rw-r--r-- | drivers/staging/pohmelfs/netfs.h | 1 | ||||
-rw-r--r-- | drivers/staging/pohmelfs/trans.c | 30 |
3 files changed, 66 insertions, 26 deletions
diff --git a/drivers/staging/pohmelfs/config.c b/drivers/staging/pohmelfs/config.c index 3e67da9..a6eaa42 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 7700e2b..c78cfcb 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 b89f9f3..168fc89 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", |