[PATCH 20/23] netconsole: use per-attribute show and store methods
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From: Christoph Hellwig <hidden>
Date: 2015-09-25 13:49:57
Also in:
ocfs2-devel
Subsystem:
netconsole, networking drivers, the rest · Maintainers:
Breno Leitao, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2015-10-03 · [PATCH 20/23] netconsole: use per-attribute show and store methods · Christoph Hellwig <hch@lst.de>
Note that the old code actually used the store_attributes method to do locking, this is moved into the individual methods. Signed-off-by: Christoph Hellwig <redacted> --- drivers/net/netconsole.c | 269 +++++++++++++++++++++++------------------------ 1 file changed, 131 insertions(+), 138 deletions(-)
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 97f3acd..8783169 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c@@ -244,15 +244,6 @@ static void free_param_target(struct netconsole_target *nt) * <target>/... */ -struct netconsole_target_attr { - struct configfs_attribute attr; - ssize_t (*show)(struct netconsole_target *nt, - char *buf); - ssize_t (*store)(struct netconsole_target *nt, - const char *buf, - size_t count); -}; - static struct netconsole_target *to_target(struct config_item *item) { return item ?
@@ -264,58 +255,62 @@ static struct netconsole_target *to_target(struct config_item *item) * Attribute operations for netconsole_target. */ -static ssize_t show_enabled(struct netconsole_target *nt, char *buf) +static ssize_t enabled_show(struct config_item *item, char *buf) { - return snprintf(buf, PAGE_SIZE, "%d\n", nt->enabled); + return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->enabled); } -static ssize_t show_extended(struct netconsole_target *nt, char *buf) +static ssize_t extended_show(struct config_item *item, char *buf) { - return snprintf(buf, PAGE_SIZE, "%d\n", nt->extended); + return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->extended); } -static ssize_t show_dev_name(struct netconsole_target *nt, char *buf) +static ssize_t dev_name_show(struct config_item *item, char *buf) { - return snprintf(buf, PAGE_SIZE, "%s\n", nt->np.dev_name); + return snprintf(buf, PAGE_SIZE, "%s\n", to_target(item)->np.dev_name); } -static ssize_t show_local_port(struct netconsole_target *nt, char *buf) +static ssize_t local_port_show(struct config_item *item, char *buf) { - return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.local_port); + return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.local_port); } -static ssize_t show_remote_port(struct netconsole_target *nt, char *buf) +static ssize_t remote_port_show(struct config_item *item, char *buf) { - return snprintf(buf, PAGE_SIZE, "%d\n", nt->np.remote_port); + return snprintf(buf, PAGE_SIZE, "%d\n", to_target(item)->np.remote_port); } -static ssize_t show_local_ip(struct netconsole_target *nt, char *buf) +static ssize_t local_ip_show(struct config_item *item, char *buf) { + struct netconsole_target *nt = to_target(item); + if (nt->np.ipv6) return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.local_ip.in6); else return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.local_ip); } -static ssize_t show_remote_ip(struct netconsole_target *nt, char *buf) +static ssize_t remote_ip_show(struct config_item *item, char *buf) { + struct netconsole_target *nt = to_target(item); + if (nt->np.ipv6) return snprintf(buf, PAGE_SIZE, "%pI6c\n", &nt->np.remote_ip.in6); else return snprintf(buf, PAGE_SIZE, "%pI4\n", &nt->np.remote_ip); } -static ssize_t show_local_mac(struct netconsole_target *nt, char *buf) +static ssize_t local_mac_show(struct config_item *item, char *buf) { - struct net_device *dev = nt->np.dev; + struct net_device *dev = to_target(item)->np.dev; static const u8 bcast[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; return snprintf(buf, PAGE_SIZE, "%pM\n", dev ? dev->dev_addr : bcast); } -static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) +static ssize_t remote_mac_show(struct config_item *item, char *buf) { - return snprintf(buf, PAGE_SIZE, "%pM\n", nt->np.remote_mac); + return snprintf(buf, PAGE_SIZE, "%pM\n", to_target(item)->np.remote_mac); } /*
@@ -325,23 +320,26 @@ static ssize_t show_remote_mac(struct netconsole_target *nt, char *buf) * would enable him to dynamically add new netpoll targets for new * network interfaces as and when they come up). */ -static ssize_t store_enabled(struct netconsole_target *nt, - const char *buf, - size_t count) +static ssize_t enabled_store(struct config_item *item, + const char *buf, size_t count) { + struct netconsole_target *nt = to_target(item); unsigned long flags; int enabled; int err; + mutex_lock(&dynamic_netconsole_mutex); err = kstrtoint(buf, 10, &enabled); if (err < 0) - return err; + goto out_unlock; + + err = -EINVAL; if (enabled < 0 || enabled > 1) - return -EINVAL; + goto out_unlock; if ((bool)enabled == nt->enabled) { pr_info("network logging has already %s\n", nt->enabled ? "started" : "stopped"); - return -EINVAL; + goto out_unlock; } if (enabled) { /* true */
@@ -358,7 +356,7 @@ static ssize_t store_enabled(struct netconsole_target *nt, err = netpoll_setup(&nt->np); if (err) - return err; + goto out_unlock; pr_info("netconsole: network logging started\n"); } else { /* false */
@@ -374,42 +372,56 @@ static ssize_t store_enabled(struct netconsole_target *nt, nt->enabled = enabled; + mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); +out_unlock: + mutex_unlock(&dynamic_netconsole_mutex); + return err; } -static ssize_t store_extended(struct netconsole_target *nt, - const char *buf, - size_t count) +static ssize_t extended_store(struct config_item *item, const char *buf, + size_t count) { + struct netconsole_target *nt = to_target(item); int extended; int err; + mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); - return -EINVAL; + err = -EINVAL; + goto out_unlock; } err = kstrtoint(buf, 10, &extended); if (err < 0) - return err; - if (extended < 0 || extended > 1) - return -EINVAL; + goto out_unlock; + if (extended < 0 || extended > 1) { + err = -EINVAL; + goto out_unlock; + } nt->extended = extended; + mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); +out_unlock: + mutex_unlock(&dynamic_netconsole_mutex); + return err; } -static ssize_t store_dev_name(struct netconsole_target *nt, - const char *buf, - size_t count) +static ssize_t dev_name_store(struct config_item *item, const char *buf, + size_t count) { + struct netconsole_target *nt = to_target(item); size_t len; + mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); + mutex_unlock(&dynamic_netconsole_mutex); return -EINVAL; }
@@ -420,53 +432,66 @@ static ssize_t store_dev_name(struct netconsole_target *nt, if (nt->np.dev_name[len - 1] == '\n') nt->np.dev_name[len - 1] = '\0'; + mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); } -static ssize_t store_local_port(struct netconsole_target *nt, - const char *buf, - size_t count) +static ssize_t local_port_store(struct config_item *item, const char *buf, + size_t count) { - int rv; + struct netconsole_target *nt = to_target(item); + int rv = -EINVAL; + mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); - return -EINVAL; + goto out_unlock; } rv = kstrtou16(buf, 10, &nt->np.local_port); if (rv < 0) - return rv; + goto out_unlock; + mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); +out_unlock: + mutex_unlock(&dynamic_netconsole_mutex); + return rv; } -static ssize_t store_remote_port(struct netconsole_target *nt, - const char *buf, - size_t count) +static ssize_t remote_port_store(struct config_item *item, + const char *buf, size_t count) { - int rv; + struct netconsole_target *nt = to_target(item); + int rv = -EINVAL; + mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); - return -EINVAL; + goto out_unlock; } rv = kstrtou16(buf, 10, &nt->np.remote_port); if (rv < 0) - return rv; + goto out_unlock; + mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); +out_unlock: + mutex_unlock(&dynamic_netconsole_mutex); + return rv; } -static ssize_t store_local_ip(struct netconsole_target *nt, - const char *buf, - size_t count) +static ssize_t local_ip_store(struct config_item *item, const char *buf, + size_t count) { + struct netconsole_target *nt = to_target(item); + + mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); - return -EINVAL; + goto out_unlock; } if (strnchr(buf, count, ':')) {
@@ -474,29 +499,35 @@ static ssize_t store_local_ip(struct netconsole_target *nt, if (in6_pton(buf, count, nt->np.local_ip.in6.s6_addr, -1, &end) > 0) { if (*end && *end != '\n') { pr_err("invalid IPv6 address at: <%c>\n", *end); - return -EINVAL; + goto out_unlock; } nt->np.ipv6 = true; } else - return -EINVAL; + goto out_unlock; } else { if (!nt->np.ipv6) { nt->np.local_ip.ip = in_aton(buf); } else - return -EINVAL; + goto out_unlock; } + mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); +out_unlock: + mutex_unlock(&dynamic_netconsole_mutex); + return -EINVAL; } -static ssize_t store_remote_ip(struct netconsole_target *nt, - const char *buf, - size_t count) +static ssize_t remote_ip_store(struct config_item *item, const char *buf, + size_t count) { + struct netconsole_target *nt = to_target(item); + + mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); - return -EINVAL; + goto out_unlock; } if (strnchr(buf, count, ':')) {
@@ -508,70 +539,67 @@ static ssize_t store_remote_ip(struct netconsole_target *nt, } nt->np.ipv6 = true; } else - return -EINVAL; + goto out_unlock; } else { if (!nt->np.ipv6) { nt->np.remote_ip.ip = in_aton(buf); } else - return -EINVAL; + goto out_unlock; } + mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); +out_unlock: + mutex_unlock(&dynamic_netconsole_mutex); + return -EINVAL; } -static ssize_t store_remote_mac(struct netconsole_target *nt, - const char *buf, - size_t count) +static ssize_t remote_mac_store(struct config_item *item, const char *buf, + size_t count) { + struct netconsole_target *nt = to_target(item); u8 remote_mac[ETH_ALEN]; + mutex_lock(&dynamic_netconsole_mutex); if (nt->enabled) { pr_err("target (%s) is enabled, disable to update parameters\n", config_item_name(&nt->item)); - return -EINVAL; + goto out_unlock; } if (!mac_pton(buf, remote_mac)) - return -EINVAL; + goto out_unlock; if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n') - return -EINVAL; + goto out_unlock; memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN); + mutex_unlock(&dynamic_netconsole_mutex); return strnlen(buf, count); +out_unlock: + mutex_unlock(&dynamic_netconsole_mutex); + return -EINVAL; } -/* - * Attribute definitions for netconsole_target. - */ - -#define NETCONSOLE_TARGET_ATTR_RO(_name) \ -static struct netconsole_target_attr netconsole_target_##_name = \ - __CONFIGFS_ATTR(_name, S_IRUGO, show_##_name, NULL) - -#define NETCONSOLE_TARGET_ATTR_RW(_name) \ -static struct netconsole_target_attr netconsole_target_##_name = \ - __CONFIGFS_ATTR(_name, S_IRUGO | S_IWUSR, show_##_name, store_##_name) - -NETCONSOLE_TARGET_ATTR_RW(enabled); -NETCONSOLE_TARGET_ATTR_RW(extended); -NETCONSOLE_TARGET_ATTR_RW(dev_name); -NETCONSOLE_TARGET_ATTR_RW(local_port); -NETCONSOLE_TARGET_ATTR_RW(remote_port); -NETCONSOLE_TARGET_ATTR_RW(local_ip); -NETCONSOLE_TARGET_ATTR_RW(remote_ip); -NETCONSOLE_TARGET_ATTR_RO(local_mac); -NETCONSOLE_TARGET_ATTR_RW(remote_mac); +CONFIGFS_ATTR(, enabled); +CONFIGFS_ATTR(, extended); +CONFIGFS_ATTR(, dev_name); +CONFIGFS_ATTR(, local_port); +CONFIGFS_ATTR(, remote_port); +CONFIGFS_ATTR(, local_ip); +CONFIGFS_ATTR(, remote_ip); +CONFIGFS_ATTR_RO(, local_mac); +CONFIGFS_ATTR(, remote_mac); static struct configfs_attribute *netconsole_target_attrs[] = { - &netconsole_target_enabled.attr, - &netconsole_target_extended.attr, - &netconsole_target_dev_name.attr, - &netconsole_target_local_port.attr, - &netconsole_target_remote_port.attr, - &netconsole_target_local_ip.attr, - &netconsole_target_remote_ip.attr, - &netconsole_target_local_mac.attr, - &netconsole_target_remote_mac.attr, + &attr_enabled, + &attr_extended, + &attr_dev_name, + &attr_local_port, + &attr_remote_port, + &attr_local_ip, + &attr_remote_ip, + &attr_local_mac, + &attr_remote_mac, NULL, };
@@ -584,43 +612,8 @@ static void netconsole_target_release(struct config_item *item) kfree(to_target(item)); } -static ssize_t netconsole_target_attr_show(struct config_item *item, - struct configfs_attribute *attr, - char *buf) -{ - ssize_t ret = -EINVAL; - struct netconsole_target *nt = to_target(item); - struct netconsole_target_attr *na = - container_of(attr, struct netconsole_target_attr, attr); - - if (na->show) - ret = na->show(nt, buf); - - return ret; -} - -static ssize_t netconsole_target_attr_store(struct config_item *item, - struct configfs_attribute *attr, - const char *buf, - size_t count) -{ - ssize_t ret = -EINVAL; - struct netconsole_target *nt = to_target(item); - struct netconsole_target_attr *na = - container_of(attr, struct netconsole_target_attr, attr); - - mutex_lock(&dynamic_netconsole_mutex); - if (na->store) - ret = na->store(nt, buf, count); - mutex_unlock(&dynamic_netconsole_mutex); - - return ret; -}