diff options
Diffstat (limited to 'ubuntu/dm-raid4-5/dm-message.c')
| -rw-r--r-- | ubuntu/dm-raid4-5/dm-message.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/ubuntu/dm-raid4-5/dm-message.c b/ubuntu/dm-raid4-5/dm-message.c new file mode 100644 index 000000000000..de21e52c76ef --- /dev/null +++ b/ubuntu/dm-raid4-5/dm-message.c @@ -0,0 +1,184 @@ +/* + * Copyright (C) 2007,2008 Red Hat Inc. All rights reserved. + * + * Module Author: Heinz Mauelshagen <heinzm@redhat.com> + * + * General device-mapper message interface argument parser. + * + * This file is released under the GPL. + * + * device-mapper message parser. + * + */ + +#include "dm.h" +#include "dm-message.h" +#include <linux/kernel.h> +#include <linux/module.h> + +#define DM_MSG_PREFIX "dm_message" + +/* Basename of a path. */ +static inline char * +basename(char *s) +{ + char *p = strrchr(s, '/'); + + return p ? p + 1 : s; +} + +/* Get an argument depending on type. */ +static void +message_arguments(struct dm_msg *msg, int argc, char **argv) +{ + + if (argc) { + int i; + struct dm_message_argument *args = msg->spec->args; + + for (i = 0; i < args->num_args; i++) { + int r; + unsigned long **ptr = args->ptr; + enum dm_message_argument_type type = args->types[i]; + + switch (type) { + case dm_msg_base_t: + ((char **) ptr)[i] = basename(argv[i]); + break; + + case dm_msg_str_t: + ((char **) ptr)[i] = argv[i]; + break; + + case dm_msg_int_t: + r = sscanf(argv[i], "%d", ((int **) ptr)[i]); + goto check; + + case dm_msg_uint_t: + r = sscanf(argv[i], "%u", + ((unsigned **) ptr)[i]); + goto check; + + case dm_msg_uint64_t: + r = sscanf(argv[i], "%llu", + ((unsigned long long **) ptr)[i]); + +check: + if (r != 1) { + set_bit(dm_msg_ret_undef, &msg->ret); + set_bit(dm_msg_ret_arg, &msg->ret); + } + } + } + } +} + +/* Parse message options. */ +static void +message_options_parse(struct dm_msg *msg, int argc, char **argv) +{ + int hit = 0; + unsigned long *action; + size_t l1 = strlen(*argv), l_hit = 0; + struct dm_message_option *o = msg->spec->options; + char **option, **option_end = o->options + o->num_options; + + for (option = o->options, action = o->actions; + option < option_end; option++, action++) { + size_t l2 = strlen(*option); + + if (!strnicmp(*argv, *option, min(l1, l2))) { + hit++; + l_hit = l2; + set_bit(*action, &msg->action); + } + } + + /* Assume error. */ + msg->ret = 0; + set_bit(dm_msg_ret_option, &msg->ret); + if (!hit || l1 > l_hit) + set_bit(dm_msg_ret_undef, &msg->ret); /* Undefined option. */ + else if (hit > 1) + set_bit(dm_msg_ret_ambiguous, &msg->ret); /* Ambiguous option.*/ + else { + clear_bit(dm_msg_ret_option, &msg->ret); /* Option OK. */ + message_arguments(msg, --argc, ++argv); + } +} + +static inline void +print_ret(const char *caller, unsigned long ret) +{ + struct { + unsigned long err; + const char *err_str; + } static err_msg[] = { + { dm_msg_ret_ambiguous, "message ambiguous" }, + { dm_msg_ret_inval, "message invalid" }, + { dm_msg_ret_undef, "message undefined" }, + { dm_msg_ret_arg, "message argument" }, + { dm_msg_ret_argcount, "message argument count" }, + { dm_msg_ret_option, "option" }, + }, *e = ARRAY_END(err_msg); + + while (e-- > err_msg) { + if (test_bit(e->err, &ret)) + DMERR("%s %s", caller, e->err_str); + } +} + +/* Parse a message action. */ +int +dm_message_parse(const char *caller, struct dm_msg *msg, void *context, + int argc, char **argv) +{ + int hit = 0; + size_t l1, l_hit = 0; + struct dm_msg_spec *s, *s_hit = NULL, + *s_end = msg->specs + msg->num_specs; + + if (argc < 2) + return -EINVAL; + + l1 = strlen(*argv); + for (s = msg->specs; s < s_end; s++) { + size_t l2 = strlen(s->cmd); + + if (!strnicmp(*argv, s->cmd, min(l1, l2))) { + hit++; + l_hit = l2; + s_hit = s; + } + } + + msg->ret = 0; + if (!hit || l1 > l_hit) /* No hit or message string too long. */ + set_bit(dm_msg_ret_undef, &msg->ret); + else if (hit > 1) /* Ambiguous message. */ + set_bit(dm_msg_ret_ambiguous, &msg->ret); + else if (argc - 2 != s_hit->args->num_args) { + set_bit(dm_msg_ret_undef, &msg->ret); + set_bit(dm_msg_ret_argcount, &msg->ret); + } + + if (msg->ret) + goto bad; + + msg->action = 0; + msg->spec = s_hit; + set_bit(s_hit->action, &msg->action); + message_options_parse(msg, --argc, ++argv); + + if (!msg->ret) + return msg->spec->f(msg, context); + +bad: + print_ret(caller, msg->ret); + return -EINVAL; +} +EXPORT_SYMBOL(dm_message_parse); + +MODULE_DESCRIPTION(DM_NAME " device-mapper target message parser"); +MODULE_AUTHOR("Heinz Mauelshagen <hjm@redhat.com>"); +MODULE_LICENSE("GPL"); |