Rename "userdata" to "extradata" since this structure will hold both user and system data in future patches. Keep "userdata" term only for data that comes from userspace (configfs), while "extradata" encompasses both userdata and future kerneldata.
These are the rules of the design
1. extradata_complete will hold userdata and sysdata (coming) 2. sysdata will come after userdata_length 3. extradata_complete[userdata_length] string will be replaced at every message 5. userdata is replaced when configfs changes (update_userdata()) 6. sysdata is replaced at every message
Example: extradata_complete = "userkey=uservalue cpu=42" userdata_length = 17 sysdata_length = 7 (space (" ") is part of sysdata)
Since sysdata is still not available, you will see the following in the send functions:
extradata_len = nt->userdata_length;
The upcoming patches will, which will add support for sysdata, will change it to:
extradata_len = nt->userdata_length + sysdata_len;
Signed-off-by: Breno Leitao leitao@debian.org Reviewed-by: Simon Horman horms@kernel.org --- drivers/net/netconsole.c | 87 ++++++++++++++++++++++++------------------------ 1 file changed, 44 insertions(+), 43 deletions(-)
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index c1ad54d99438dbd14e8288d39ad6bcc6f8ff5ad1..15867bb481e226cbb4164642e470baecca730a40 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -45,12 +45,12 @@ MODULE_DESCRIPTION("Console driver for network interfaces"); MODULE_LICENSE("GPL");
#define MAX_PARAM_LENGTH 256 -#define MAX_USERDATA_ENTRY_LENGTH 256 -#define MAX_USERDATA_VALUE_LENGTH 200 +#define MAX_EXTRADATA_ENTRY_LEN 256 +#define MAX_EXTRADATA_VALUE_LEN 200 /* The number 3 comes from userdata entry format characters (' ', '=', '\n') */ -#define MAX_USERDATA_NAME_LENGTH (MAX_USERDATA_ENTRY_LENGTH - \ - MAX_USERDATA_VALUE_LENGTH - 3) -#define MAX_USERDATA_ITEMS 16 +#define MAX_EXTRADATA_NAME_LEN (MAX_EXTRADATA_ENTRY_LEN - \ + MAX_EXTRADATA_VALUE_LEN - 3) +#define MAX_EXTRADATA_ITEMS 16 #define MAX_PRINT_CHUNK 1000
static char config[MAX_PARAM_LENGTH]; @@ -102,8 +102,8 @@ struct netconsole_target_stats { * @list: Links this target into the target_list. * @group: Links us into the configfs subsystem hierarchy. * @userdata_group: Links to the userdata configfs hierarchy - * @userdata_complete: Cached, formatted string of append - * @userdata_length: String length of userdata_complete + * @extradata_complete: Cached, formatted string of append + * @userdata_length: String length of usedata in extradata_complete. * @stats: Packet send stats for the target. Used for debugging. * @enabled: On / off knob to enable / disable target. * Visible from userspace (read-write). @@ -130,7 +130,7 @@ struct netconsole_target { #ifdef CONFIG_NETCONSOLE_DYNAMIC struct config_group group; struct config_group userdata_group; - char userdata_complete[MAX_USERDATA_ENTRY_LENGTH * MAX_USERDATA_ITEMS]; + char extradata_complete[MAX_EXTRADATA_ENTRY_LEN * MAX_EXTRADATA_ITEMS]; size_t userdata_length; #endif struct netconsole_target_stats stats; @@ -690,7 +690,7 @@ static ssize_t remote_mac_store(struct config_item *item, const char *buf,
struct userdatum { struct config_item item; - char value[MAX_USERDATA_VALUE_LENGTH]; + char value[MAX_EXTRADATA_VALUE_LEN]; };
static struct userdatum *to_userdatum(struct config_item *item) @@ -727,13 +727,13 @@ static void update_userdata(struct netconsole_target *nt)
/* Clear the current string in case the last userdatum was deleted */ nt->userdata_length = 0; - nt->userdata_complete[0] = 0; + nt->extradata_complete[0] = 0;
list_for_each(entry, &nt->userdata_group.cg_children) { struct userdatum *udm_item; struct config_item *item;
- if (WARN_ON_ONCE(child_count >= MAX_USERDATA_ITEMS)) + if (WARN_ON_ONCE(child_count >= MAX_EXTRADATA_ITEMS)) break; child_count++;
@@ -741,19 +741,19 @@ static void update_userdata(struct netconsole_target *nt) udm_item = to_userdatum(item);
/* Skip userdata with no value set */ - if (strnlen(udm_item->value, MAX_USERDATA_VALUE_LENGTH) == 0) + if (strnlen(udm_item->value, MAX_EXTRADATA_VALUE_LEN) == 0) continue;
- /* This doesn't overflow userdata_complete since it will write - * one entry length (1/MAX_USERDATA_ITEMS long), entry count is + /* This doesn't overflow extradata_complete since it will write + * one entry length (1/MAX_EXTRADATA_ITEMS long), entry count is * checked to not exceed MAX items with child_count above */ - complete_idx += scnprintf(&nt->userdata_complete[complete_idx], - MAX_USERDATA_ENTRY_LENGTH, " %s=%s\n", + complete_idx += scnprintf(&nt->extradata_complete[complete_idx], + MAX_EXTRADATA_ENTRY_LEN, " %s=%s\n", item->ci_name, udm_item->value); } - nt->userdata_length = strnlen(nt->userdata_complete, - sizeof(nt->userdata_complete)); + nt->userdata_length = strnlen(nt->extradata_complete, + sizeof(nt->extradata_complete)); }
static ssize_t userdatum_value_store(struct config_item *item, const char *buf, @@ -764,7 +764,7 @@ static ssize_t userdatum_value_store(struct config_item *item, const char *buf, struct userdata *ud; ssize_t ret;
- if (count > MAX_USERDATA_VALUE_LENGTH) + if (count > MAX_EXTRADATA_VALUE_LEN) return -EMSGSIZE;
mutex_lock(&dynamic_netconsole_mutex); @@ -813,13 +813,13 @@ static struct config_item *userdatum_make_item(struct config_group *group, struct userdata *ud; size_t child_count;
- if (strlen(name) > MAX_USERDATA_NAME_LENGTH) + if (strlen(name) > MAX_EXTRADATA_NAME_LEN) return ERR_PTR(-ENAMETOOLONG);
ud = to_userdata(&group->cg_item); nt = userdata_to_target(ud); child_count = list_count_nodes(&nt->userdata_group.cg_children); - if (child_count >= MAX_USERDATA_ITEMS) + if (child_count >= MAX_EXTRADATA_ITEMS) return ERR_PTR(-ENOSPC);
udm = kzalloc(sizeof(*udm), GFP_KERNEL); @@ -1120,11 +1120,11 @@ static void send_msg_no_fragmentation(struct netconsole_target *nt, int msg_len, int release_len) { - const char *userdata = NULL; + const char *extradata = NULL; const char *release;
#ifdef CONFIG_NETCONSOLE_DYNAMIC - userdata = nt->userdata_complete; + extradata = nt->extradata_complete; #endif
if (release_len) { @@ -1136,10 +1136,10 @@ static void send_msg_no_fragmentation(struct netconsole_target *nt, memcpy(nt->buf, msg, msg_len); }
- if (userdata) + if (extradata) msg_len += scnprintf(&nt->buf[msg_len], MAX_PRINT_CHUNK - msg_len, - "%s", userdata); + "%s", extradata);
send_udp(nt, nt->buf, msg_len); } @@ -1156,24 +1156,25 @@ static void send_fragmented_body(struct netconsole_target *nt, const char *msgbody, int header_len, int msgbody_len) { - const char *userdata = NULL; + int sent_extradata, preceding_bytes; + const char *extradata = NULL; int body_len, offset = 0; - int userdata_len = 0; + int extradata_len = 0;
#ifdef CONFIG_NETCONSOLE_DYNAMIC - userdata = nt->userdata_complete; - userdata_len = nt->userdata_length; + extradata = nt->extradata_complete; + extradata_len = nt->userdata_length; #endif
/* body_len represents the number of bytes that will be sent. This is * bigger than MAX_PRINT_CHUNK, thus, it will be split in multiple * packets */ - body_len = msgbody_len + userdata_len; + body_len = msgbody_len + extradata_len;
/* In each iteration of the while loop below, we send a packet * containing the header and a portion of the body. The body is - * composed of two parts: msgbody and userdata. We keep track of how + * composed of two parts: msgbody and extradata. We keep track of how * many bytes have been sent so far using the offset variable, which * ranges from 0 to the total length of the body. */ @@ -1201,36 +1202,36 @@ static void send_fragmented_body(struct netconsole_target *nt,
/* msgbody was finally written, either in the previous * messages and/or in the current buf. Time to write - * the userdata. + * the extradata. */ msgbody_written |= offset + this_offset >= msgbody_len;
- /* Msg body is fully written and there is pending userdata to - * write, append userdata in this chunk + /* Msg body is fully written and there is pending extradata to + * write, append extradata in this chunk */ if (msgbody_written && offset + this_offset < body_len) { /* Track how much user data was already sent. First * time here, sent_userdata is zero */ - int sent_userdata = (offset + this_offset) - msgbody_len; + sent_extradata = (offset + this_offset) - msgbody_len; /* offset of bytes used in current buf */ - int preceding_bytes = this_chunk + this_header; + preceding_bytes = this_chunk + this_header;
- if (WARN_ON_ONCE(sent_userdata < 0)) + if (WARN_ON_ONCE(sent_extradata < 0)) return;
- this_chunk = min(userdata_len - sent_userdata, + this_chunk = min(extradata_len - sent_extradata, MAX_PRINT_CHUNK - preceding_bytes); if (WARN_ON_ONCE(this_chunk < 0)) /* this_chunk could be zero if all the previous * message used all the buffer. This is not a - * problem, userdata will be sent in the next + * problem, extradata will be sent in the next * iteration */ return;
memcpy(nt->buf + this_header + this_offset, - userdata + sent_userdata, + extradata + sent_extradata, this_chunk); this_offset += this_chunk; } @@ -1287,17 +1288,17 @@ static void send_msg_fragmented(struct netconsole_target *nt, static void send_ext_msg_udp(struct netconsole_target *nt, const char *msg, int msg_len) { - int userdata_len = 0; + int extradata_len = 0; int release_len = 0;
#ifdef CONFIG_NETCONSOLE_DYNAMIC - userdata_len = nt->userdata_length; + extradata_len = nt->userdata_length; #endif
if (nt->release) release_len = strlen(init_utsname()->release) + 1;
- if (msg_len + release_len + userdata_len <= MAX_PRINT_CHUNK) + if (msg_len + release_len + extradata_len <= MAX_PRINT_CHUNK) return send_msg_no_fragmentation(nt, msg, msg_len, release_len);
return send_msg_fragmented(nt, msg, msg_len, release_len);