mdev: improve $SEQ handling; improve debug logging
Sequential run of concurrent mdev's was too simplistic:
they waited for /dev/mdev.seq to match. This could sometimes
cause cumulative loss of time on the order of a second.
Added SIGCHLD signaling from exiting mdev to all other mdev's.
Added debugging required to see that code actually works as intended.
Example of /dev/mdev.log (with "woken up" elevated from dbg lvl 3 to 2):
mdev[1023]: first seq written
^^^^ seq, not pid
mdev[1023]: 35.022395 ACTION:add SUBSYSTEM:module DEVNAME:(null) DEVPATH:/module/lib80211
mdev[1023]: rule matched, line -1
^^^^^^^ means "default rule"
mdev[1023]: 35.022676 exiting
^^^^^^^^^ second,usec timestamp
mdev[1024]: 35.069691 ACTION:add SUBSYSTEM:vc DEVNAME:vcs9 DEVPATH:/devices/virtual/vc/vcs9
mdev[1024]: dev 7,9
mdev[1025]: 35.069889 waiting for '1024'
mdev[1026]: 35.069946 waiting for '1024'
mdev[1027]: 35.070151 waiting for '1024'
mdev[1024]: rule matched, line -1
mdev[1024]: mknod vcs9 (7,9) 20660 0:0
mdev[1024]: 35.070346 exiting
mdev[1025]: woken up
mdev[1026]: woken up
mdev[1025]: 35.071213 ACTION:add SUBSYSTEM:vc DEVNAME:vcsa9 DEVPATH:/devices/virtual/vc/vcsa9
^^^^^^^^^ took only a millisecond to start running after prev mdev exited
mdev[1025]: dev 7,137
mdev[1027]: woken up
mdev[1025]: rule matched, line -1
mdev[1025]: mknod vcsa9 (7,137) 20660 0:0
mdev[1025]: 35.072109 exiting
function old new delta
mdev_main 849 1372 +523
curtime - 59 +59
dirAction 87 134 +47
static.ts - 8 +8
keywords 19 12 -7
make_device 2189 2119 -70
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
9fed24c031
commit
5bce135e36
@ -7,9 +7,9 @@
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# instead of the default 0:0 660.
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#
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# Syntax:
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# [-]devicename_regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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# [-]$ENVVAR=regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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# [-]@maj,min[-min2] user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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# [-][ENVVAR=regex;]...devicename_regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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# [-][ENVVAR=regex;]...@maj,min[-min2] user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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# [-]$ENVVAR=regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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#
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# [-]: do not stop on this match, continue reading mdev.conf
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# =: move, >: move and create a symlink
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@ -53,6 +53,7 @@ sr[0-9]* root:cdrom 660 @ln -sf $MDEV cdrom
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fd[0-9]* root:floppy 660
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# net devices
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SUBSYSTEM=net;.* root:root 600 @nameif
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tun[0-9]* root:root 600 =net/
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tap[0-9]* root:root 600 =net/
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@ -230,7 +230,26 @@
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* SUBSYSTEM=block
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*/
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static const char keywords[] ALIGN1 = "add\0remove\0change\0";
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#define DEBUG_LVL 2
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#if DEBUG_LVL >= 1
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# define dbg1(...) do { if (G.verbose) bb_error_msg(__VA_ARGS__); } while(0)
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#else
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# define dbg1(...) ((void)0)
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#endif
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#if DEBUG_LVL >= 2
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# define dbg2(...) do { if (G.verbose >= 2) bb_error_msg(__VA_ARGS__); } while(0)
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#else
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# define dbg2(...) ((void)0)
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#endif
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#if DEBUG_LVL >= 3
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# define dbg3(...) do { if (G.verbose >= 3) bb_error_msg(__VA_ARGS__); } while(0)
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#else
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# define dbg3(...) ((void)0)
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#endif
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static const char keywords[] ALIGN1 = "add\0remove\0"; // "change\0"
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enum { OP_add, OP_remove };
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struct envmatch {
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@ -256,6 +275,7 @@ struct globals {
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int root_major, root_minor;
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smallint verbose;
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char *subsystem;
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char *subsys_env; /* for putenv("SUBSYSTEM=subsystem") */
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#if ENABLE_FEATURE_MDEV_CONF
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const char *filename;
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parser_t *parser;
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@ -263,6 +283,7 @@ struct globals {
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unsigned rule_idx;
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#endif
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struct rule cur_rule;
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char timestr[sizeof("60.123456")];
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define INIT_G() do { \
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@ -277,13 +298,6 @@ struct globals {
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/* We use additional 64+ bytes in make_device() */
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#define SCRATCH_SIZE 80
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#if 0
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# define dbg(...) bb_error_msg(__VA_ARGS__)
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#else
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# define dbg(...) ((void)0)
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#endif
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#if ENABLE_FEATURE_MDEV_CONF
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static void make_default_cur_rule(void)
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@ -349,7 +363,7 @@ static void parse_next_rule(void)
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break;
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/* Fields: [-]regex uid:gid mode [alias] [cmd] */
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dbg("token1:'%s'", tokens[1]);
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dbg3("token1:'%s'", tokens[1]);
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/* 1st field */
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val = tokens[0];
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@ -417,7 +431,7 @@ static void parse_next_rule(void)
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clean_up_cur_rule();
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} /* while (config_read) */
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dbg("config_close(G.parser)");
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dbg3("config_close(G.parser)");
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config_close(G.parser);
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G.parser = NULL;
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@ -434,7 +448,7 @@ static const struct rule *next_rule(void)
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/* Open conf file if we didn't do it yet */
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if (!G.parser && G.filename) {
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dbg("config_open('%s')", G.filename);
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dbg3("config_open('%s')", G.filename);
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G.parser = config_open2(G.filename, fopen_for_read);
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G.filename = NULL;
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}
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@ -443,7 +457,7 @@ static const struct rule *next_rule(void)
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/* mdev -s */
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/* Do we have rule parsed already? */
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if (G.rule_vec[G.rule_idx]) {
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dbg("< G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
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dbg3("< G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
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return G.rule_vec[G.rule_idx++];
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}
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make_default_cur_rule();
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@ -460,7 +474,7 @@ static const struct rule *next_rule(void)
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rule = memcpy(xmalloc(sizeof(G.cur_rule)), &G.cur_rule, sizeof(G.cur_rule));
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G.rule_vec = xrealloc_vector(G.rule_vec, 4, G.rule_idx);
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G.rule_vec[G.rule_idx++] = rule;
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dbg("> G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
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dbg3("> G.rule_vec[G.rule_idx:%d]=%p", G.rule_idx, G.rule_vec[G.rule_idx]);
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}
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}
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@ -538,9 +552,6 @@ static void make_device(char *device_name, char *path, int operation)
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{
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int major, minor, type, len;
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if (G.verbose)
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bb_error_msg("device: %s, %s", device_name, path);
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/* Try to read major/minor string. Note that the kernel puts \n after
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* the data, so we don't need to worry about null terminating the string
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* because sscanf() will stop at the first nondigit, which \n is.
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@ -559,8 +570,7 @@ static void make_device(char *device_name, char *path, int operation)
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/* no "dev" file, but we can still run scripts
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* based on device name */
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} else if (sscanf(++dev_maj_min, "%u:%u", &major, &minor) == 2) {
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if (G.verbose)
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bb_error_msg("maj,min: %u,%u", major, minor);
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dbg1("dev %u,%u", major, minor);
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} else {
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major = -1;
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}
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@ -570,7 +580,8 @@ static void make_device(char *device_name, char *path, int operation)
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/* Determine device name, type, major and minor */
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if (!device_name)
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device_name = (char*) bb_basename(path);
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/* http://kernel.org/doc/pending/hotplug.txt says that only
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/*
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* http://kernel.org/doc/pending/hotplug.txt says that only
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* "/sys/block/..." is for block devices. "/sys/bus" etc is not.
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* But since 2.6.25 block devices are also in /sys/class/block.
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* We use strstr("/block/") to forestall future surprises.
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@ -608,7 +619,7 @@ static void make_device(char *device_name, char *path, int operation)
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}
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if (rule->envvar) { /* $envvar=regex rule */
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str_to_match = getenv(rule->envvar);
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dbg("getenv('%s'):'%s'", rule->envvar, str_to_match);
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dbg3("getenv('%s'):'%s'", rule->envvar, str_to_match);
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if (!str_to_match)
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continue;
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}
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@ -616,7 +627,7 @@ static void make_device(char *device_name, char *path, int operation)
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if (rule->regex_compiled) {
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int regex_match = regexec(&rule->match, str_to_match, ARRAY_SIZE(off), off, 0);
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dbg("regex_match for '%s':%d", str_to_match, regex_match);
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dbg3("regex_match for '%s':%d", str_to_match, regex_match);
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//bb_error_msg("matches:");
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//for (int i = 0; i < ARRAY_SIZE(off); i++) {
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// if (off[i].rm_so < 0) continue;
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@ -636,7 +647,7 @@ static void make_device(char *device_name, char *path, int operation)
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/* else: it's final implicit "match-all" rule */
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rule_matches:
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#endif
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dbg("rule matched");
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dbg2("rule matched, line %d", G.parser ? G.parser->lineno : -1);
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/* Build alias name */
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alias = NULL;
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@ -680,34 +691,30 @@ static void make_device(char *device_name, char *path, int operation)
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}
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}
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}
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dbg("alias:'%s'", alias);
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dbg3("alias:'%s'", alias);
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command = NULL;
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IF_FEATURE_MDEV_EXEC(command = rule->r_cmd;)
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if (command) {
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const char *s = "$@*";
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const char *s2 = strchr(s, command[0]);
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/* Are we running this command now?
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* Run $cmd on delete, @cmd on create, *cmd on both
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* Run @cmd on create, $cmd on delete, *cmd on any
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*/
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if (s2 - s != (operation == OP_remove) || *s2 == '*') {
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/* We are here if: '*',
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* or: '@' and delete = 0,
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* or: '$' and delete = 1
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*/
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if ((command[0] == '@' && operation == OP_add)
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|| (command[0] == '$' && operation == OP_remove)
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|| (command[0] == '*')
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) {
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command++;
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} else {
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command = NULL;
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}
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}
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dbg("command:'%s'", command);
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dbg3("command:'%s'", command);
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/* "Execute" the line we found */
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node_name = device_name;
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if (ENABLE_FEATURE_MDEV_RENAME && alias) {
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node_name = alias = build_alias(alias, device_name);
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dbg("alias2:'%s'", alias);
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dbg3("alias2:'%s'", alias);
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}
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if (operation == OP_add && major >= 0) {
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@ -717,13 +724,20 @@ static void make_device(char *device_name, char *path, int operation)
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mkdir_recursive(node_name);
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*slash = '/';
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}
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if (G.verbose)
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bb_error_msg("mknod: %s (%d,%d) %o", node_name, major, minor, rule->mode | type);
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if (ENABLE_FEATURE_MDEV_CONF) {
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dbg1("mknod %s (%d,%d) %o"
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" %u:%u",
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node_name, major, minor, rule->mode | type,
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rule->ugid.uid, rule->ugid.gid
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);
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} else {
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dbg1("mknod %s (%d,%d) %o",
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node_name, major, minor, rule->mode | type
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);
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}
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if (mknod(node_name, rule->mode | type, makedev(major, minor)) && errno != EEXIST)
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bb_perror_msg("can't create '%s'", node_name);
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if (ENABLE_FEATURE_MDEV_CONF) {
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if (G.verbose)
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bb_error_msg("chmod: %o chown: %u:%u", rule->mode, rule->ugid.uid, rule->ugid.gid);
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chmod(node_name, rule->mode);
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chown(node_name, rule->ugid.uid, rule->ugid.gid);
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}
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@ -734,8 +748,7 @@ static void make_device(char *device_name, char *path, int operation)
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//TODO: on devtmpfs, device_name already exists and symlink() fails.
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//End result is that instead of symlink, we have two nodes.
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//What should be done?
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if (G.verbose)
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bb_error_msg("symlink: %s", device_name);
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dbg1("symlink: %s", device_name);
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symlink(node_name, device_name);
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}
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}
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@ -744,27 +757,21 @@ static void make_device(char *device_name, char *path, int operation)
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if (ENABLE_FEATURE_MDEV_EXEC && command) {
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/* setenv will leak memory, use putenv/unsetenv/free */
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char *s = xasprintf("%s=%s", "MDEV", node_name);
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char *s1 = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
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putenv(s);
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putenv(s1);
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if (G.verbose)
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bb_error_msg("running: %s", command);
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dbg1("running: %s", command);
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if (system(command) == -1)
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bb_perror_msg("can't run '%s'", command);
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bb_unsetenv_and_free(s1);
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bb_unsetenv_and_free(s);
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}
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if (operation == OP_remove && major >= -1) {
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if (ENABLE_FEATURE_MDEV_RENAME && alias) {
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if (aliaslink == '>') {
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if (G.verbose)
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bb_error_msg("unlink: %s", device_name);
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dbg1("unlink: %s", device_name);
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unlink(device_name);
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}
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}
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if (G.verbose)
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bb_error_msg("unlink: %s", node_name);
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dbg1("unlink: %s", node_name);
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unlink(node_name);
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}
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@ -809,10 +816,15 @@ static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM,
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* under /sys/class/ */
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if (1 == depth) {
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free(G.subsystem);
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if (G.subsys_env) {
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bb_unsetenv_and_free(G.subsys_env);
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G.subsys_env = NULL;
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}
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G.subsystem = strrchr(fileName, '/');
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if (G.subsystem) {
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G.subsystem = xstrdup(G.subsystem + 1);
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xsetenv("SUBSYSTEM", G.subsystem);
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G.subsys_env = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
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putenv(G.subsys_env);
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}
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}
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@ -885,6 +897,100 @@ static void load_firmware(const char *firmware, const char *sysfs_path)
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}
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}
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static char *curtime(void)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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sprintf(G.timestr, "%u.%06u", (unsigned)tv.tv_sec % 60, (unsigned)tv.tv_usec);
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return G.timestr;
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}
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static void open_mdev_log(const char *seq, unsigned my_pid)
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{
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int logfd = open("mdev.log", O_WRONLY | O_APPEND);
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if (logfd >= 0) {
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xmove_fd(logfd, STDERR_FILENO);
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G.verbose = 2;
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applet_name = xasprintf("%s[%s]", applet_name, seq ? seq : utoa(my_pid));
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}
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}
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/* If it exists, does /dev/mdev.seq match $SEQNUM?
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* If it does not match, earlier mdev is running
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* in parallel, and we need to wait.
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* Active mdev pokes us with SIGCHLD to check the new file.
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*/
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static int
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wait_for_seqfile(const char *seq)
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{
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/* We time out after 2 sec */
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static const struct timespec ts = { 0, 32*1000*1000 };
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int timeout = 2000 / 32;
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int seq_fd = -1;
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int do_once = 1;
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sigset_t set_CHLD;
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sigemptyset(&set_CHLD);
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sigaddset(&set_CHLD, SIGCHLD);
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sigprocmask(SIG_BLOCK, &set_CHLD, NULL);
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for (;;) {
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int seqlen;
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char seqbuf[sizeof(int)*3 + 2];
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if (seq_fd < 0) {
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seq_fd = open("mdev.seq", O_RDWR);
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if (seq_fd < 0)
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break;
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}
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seqlen = pread(seq_fd, seqbuf, sizeof(seqbuf) - 1, 0);
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if (seqlen < 0) {
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close(seq_fd);
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seq_fd = -1;
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break;
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}
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seqbuf[seqlen] = '\0';
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if (seqbuf[0] == '\n') {
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/* seed file: write out seq ASAP */
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xwrite_str(seq_fd, seq);
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xlseek(seq_fd, 0, SEEK_SET);
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dbg2("first seq written");
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break;
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}
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if (strcmp(seq, seqbuf) == 0) {
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/* correct idx */
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break;
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}
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if (do_once) {
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dbg2("%s waiting for '%s'", curtime(), seqbuf);
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do_once = 0;
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}
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if (sigtimedwait(&set_CHLD, NULL, &ts) >= 0) {
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dbg3("woken up");
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continue; /* don't decrement timeout! */
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}
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if (--timeout == 0) {
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||||
dbg1("%s waiting for '%s'", "timed out", seqbuf);
|
||||
break;
|
||||
}
|
||||
}
|
||||
sigprocmask(SIG_UNBLOCK, &set_CHLD, NULL);
|
||||
return seq_fd;
|
||||
}
|
||||
|
||||
static void signal_mdevs(unsigned my_pid)
|
||||
{
|
||||
procps_status_t* p = NULL;
|
||||
while ((p = procps_scan(p, PSSCAN_ARGV0)) != NULL) {
|
||||
if (p->pid != my_pid
|
||||
&& p->argv0
|
||||
&& strcmp(bb_basename(p->argv0), "mdev") == 0
|
||||
) {
|
||||
kill(p->pid, SIGCHLD);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
int mdev_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
||||
int mdev_main(int argc UNUSED_PARAM, char **argv)
|
||||
{
|
||||
@ -946,11 +1052,13 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
|
||||
char *action;
|
||||
char *env_devname;
|
||||
char *env_devpath;
|
||||
unsigned my_pid;
|
||||
int seq_fd;
|
||||
smalluint op;
|
||||
|
||||
/* Hotplug:
|
||||
* env ACTION=... DEVPATH=... SUBSYSTEM=... [SEQNUM=...] mdev
|
||||
* ACTION can be "add" or "remove"
|
||||
* ACTION can be "add", "remove", "change"
|
||||
* DEVPATH is like "/block/sda" or "/class/input/mice"
|
||||
*/
|
||||
action = getenv("ACTION");
|
||||
@ -961,41 +1069,20 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
|
||||
if (!action || !env_devpath /*|| !G.subsystem*/)
|
||||
bb_show_usage();
|
||||
fw = getenv("FIRMWARE");
|
||||
/* If it exists, does /dev/mdev.seq match $SEQNUM?
|
||||
* If it does not match, earlier mdev is running
|
||||
* in parallel, and we need to wait */
|
||||
seq = getenv("SEQNUM");
|
||||
if (seq) {
|
||||
int timeout = 2000 / 32; /* 2000 msec */
|
||||
do {
|
||||
int seqlen;
|
||||
char seqbuf[sizeof(int)*3 + 2];
|
||||
|
||||
seqlen = open_read_close("mdev.seq", seqbuf, sizeof(seqbuf) - 1);
|
||||
if (seqlen < 0) {
|
||||
seq = NULL;
|
||||
break;
|
||||
}
|
||||
seqbuf[seqlen] = '\0';
|
||||
if (seqbuf[0] == '\n' /* seed file? */
|
||||
|| strcmp(seq, seqbuf) == 0 /* correct idx? */
|
||||
) {
|
||||
break;
|
||||
}
|
||||
usleep(32*1000);
|
||||
} while (--timeout);
|
||||
}
|
||||
my_pid = getpid();
|
||||
open_mdev_log(seq, my_pid);
|
||||
|
||||
{
|
||||
int logfd = open("mdev.log", O_WRONLY | O_APPEND);
|
||||
if (logfd >= 0) {
|
||||
xmove_fd(logfd, STDERR_FILENO);
|
||||
G.verbose = 1;
|
||||
if (seq)
|
||||
applet_name = xasprintf("%s[%s]", applet_name, seq);
|
||||
bb_error_msg("action: %s", action);
|
||||
}
|
||||
}
|
||||
seq_fd = seq ? wait_for_seqfile(seq) : -1;
|
||||
|
||||
dbg1("%s "
|
||||
"ACTION:%s SUBSYSTEM:%s DEVNAME:%s DEVPATH:%s"
|
||||
"%s%s",
|
||||
curtime(),
|
||||
action, G.subsystem, env_devname, env_devpath,
|
||||
fw ? " FW:" : "", fw ? fw : ""
|
||||
);
|
||||
|
||||
snprintf(temp, PATH_MAX, "/sys%s", env_devpath);
|
||||
if (op == OP_remove) {
|
||||
@ -1005,16 +1092,18 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
|
||||
if (!fw)
|
||||
make_device(env_devname, temp, op);
|
||||
}
|
||||
else if (op == OP_add) {
|
||||
else {
|
||||
make_device(env_devname, temp, op);
|
||||
if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
|
||||
if (fw)
|
||||
if (op == OP_add && fw)
|
||||
load_firmware(fw, temp);
|
||||
}
|
||||
}
|
||||
|
||||
if (seq) {
|
||||
xopen_xwrite_close("mdev.seq", utoa(xatou(seq) + 1));
|
||||
dbg1("%s exiting", curtime());
|
||||
if (seq_fd >= 0) {
|
||||
xwrite_str(seq_fd, utoa(xatou(seq) + 1));
|
||||
signal_mdevs(my_pid);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user