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kernel/params.c
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/* Helpers for initial module or kernel cmdline parsing Copyright (C) 2001 Rusty Russell. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ |
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#include <linux/moduleparam.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/module.h> #include <linux/device.h> #include <linux/err.h> |
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#include <linux/slab.h> |
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#include <linux/ctype.h> |
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#include <linux/string.h> |
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#if 0 #define DEBUGP printk #else #define DEBUGP(fmt, a...) #endif |
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static inline char dash2underscore(char c) |
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{ if (c == '-') return '_'; return c; } static inline int parameq(const char *input, const char *paramname) { unsigned int i; for (i = 0; dash2underscore(input[i]) == paramname[i]; i++) if (input[i] == '\0') return 1; return 0; } static int parse_one(char *param, char *val, struct kernel_param *params, unsigned num_params, int (*handle_unknown)(char *param, char *val)) { unsigned int i; /* Find parameter */ for (i = 0; i < num_params; i++) { if (parameq(param, params[i].name)) { DEBUGP("They are equal! Calling %p ", params[i].set); return params[i].set(val, ¶ms[i]); } } if (handle_unknown) { DEBUGP("Unknown argument: calling %p ", handle_unknown); return handle_unknown(param, val); } DEBUGP("Unknown argument `%s' ", param); return -ENOENT; } /* You can use " around spaces, but can't escape ". */ /* Hyphens and underscores equivalent in parameter names. */ static char *next_arg(char *args, char **param, char **val) { unsigned int i, equals = 0; int in_quote = 0, quoted = 0; char *next; |
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if (*args == '"') { args++; in_quote = 1; quoted = 1; } for (i = 0; args[i]; i++) { |
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if (isspace(args[i]) && !in_quote) |
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break; if (equals == 0) { if (args[i] == '=') equals = i; } if (args[i] == '"') in_quote = !in_quote; } *param = args; if (!equals) *val = NULL; else { args[equals] = '\0'; *val = args + equals + 1; /* Don't include quotes in value. */ if (**val == '"') { (*val)++; if (args[i-1] == '"') args[i-1] = '\0'; } if (quoted && args[i-1] == '"') args[i-1] = '\0'; } if (args[i]) { args[i] = '\0'; next = args + i + 1; } else next = args + i; |
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/* Chew up trailing spaces. */ |
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return skip_spaces(next); |
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} /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ int parse_args(const char *name, char *args, struct kernel_param *params, unsigned num, int (*unknown)(char *param, char *val)) { char *param, *val; DEBUGP("Parsing ARGS: %s ", args); |
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/* Chew leading spaces */ |
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args = skip_spaces(args); |
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while (*args) { int ret; |
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int irq_was_disabled; |
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args = next_arg(args, ¶m, &val); |
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irq_was_disabled = irqs_disabled(); |
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ret = parse_one(param, val, params, num, unknown); |
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if (irq_was_disabled && !irqs_disabled()) { printk(KERN_WARNING "parse_args(): option '%s' enabled " "irq's! ", param); } |
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switch (ret) { case -ENOENT: printk(KERN_ERR "%s: Unknown parameter `%s' ", name, param); return ret; case -ENOSPC: printk(KERN_ERR "%s: `%s' too large for parameter `%s' ", name, val ?: "", param); return ret; case 0: break; default: printk(KERN_ERR "%s: `%s' invalid for parameter `%s' ", name, val ?: "", param); return ret; } } /* All parsed OK. */ return 0; } /* Lazy bastard, eh? */ #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ int param_set_##name(const char *val, struct kernel_param *kp) \ { \ |
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tmptype l; \ |
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int ret; \ |
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\ if (!val) return -EINVAL; \ |
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ret = strtolfn(val, 0, &l); \ if (ret == -EINVAL || ((type)l != l)) \ |
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return -EINVAL; \ *((type *)kp->arg) = l; \ return 0; \ } \ int param_get_##name(char *buffer, struct kernel_param *kp) \ { \ return sprintf(buffer, format, *((type *)kp->arg)); \ } |
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STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul); STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol); STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul); STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol); STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul); STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol); STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); |
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int param_set_charp(const char *val, struct kernel_param *kp) { if (!val) { printk(KERN_ERR "%s: string parameter expected ", kp->name); return -EINVAL; } if (strlen(val) > 1024) { printk(KERN_ERR "%s: string parameter too long ", kp->name); return -ENOSPC; } |
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/* This is a hack. We can't need to strdup in early boot, and we * don't need to; this mangled commandline is preserved. */ if (slab_is_available()) { |
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*(char **)kp->arg = kstrdup(val, GFP_KERNEL); |
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if (!*(char **)kp->arg) |
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return -ENOMEM; } else *(const char **)kp->arg = val; |
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return 0; } int param_get_charp(char *buffer, struct kernel_param *kp) { return sprintf(buffer, "%s", *((char **)kp->arg)); } |
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/* Actually could be a bool or an int, for historical reasons. */ |
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int param_set_bool(const char *val, struct kernel_param *kp) { |
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bool v; |
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/* No equals means "set"... */ if (!val) val = "1"; /* One of =[yYnN01] */ switch (val[0]) { case 'y': case 'Y': case '1': |
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v = true; break; |
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case 'n': case 'N': case '0': |
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v = false; break; default: return -EINVAL; |
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} |
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if (kp->flags & KPARAM_ISBOOL) *(bool *)kp->arg = v; else *(int *)kp->arg = v; return 0; |
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} int param_get_bool(char *buffer, struct kernel_param *kp) { |
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bool val; if (kp->flags & KPARAM_ISBOOL) val = *(bool *)kp->arg; else val = *(int *)kp->arg; |
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/* Y and N chosen as being relatively non-coder friendly */ |
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return sprintf(buffer, "%c", val ? 'Y' : 'N'); |
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} |
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/* This one must be bool. */ |
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int param_set_invbool(const char *val, struct kernel_param *kp) { |
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int ret; bool boolval; |
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struct kernel_param dummy; |
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dummy.arg = &boolval; |
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dummy.flags = KPARAM_ISBOOL; |
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ret = param_set_bool(val, &dummy); if (ret == 0) |
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*(bool *)kp->arg = !boolval; |
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return ret; } int param_get_invbool(char *buffer, struct kernel_param *kp) { |
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return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
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} |
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/* We break the rule and mangle the string. */ |
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static int param_array(const char *name, const char *val, unsigned int min, unsigned int max, void *elem, int elemsize, int (*set)(const char *, struct kernel_param *kp), |
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u16 flags, |
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unsigned int *num) |
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{ int ret; struct kernel_param kp; char save; /* Get the name right for errors. */ kp.name = name; kp.arg = elem; |
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kp.flags = flags; |
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/* No equals sign? */ if (!val) { printk(KERN_ERR "%s: expects arguments ", name); return -EINVAL; } *num = 0; /* We expect a comma-separated list of values. */ do { int len; if (*num == max) { printk(KERN_ERR "%s: can only take %i arguments ", name, max); return -EINVAL; } len = strcspn(val, ","); /* nul-terminate and parse */ save = val[len]; ((char *)val)[len] = '\0'; ret = set(val, &kp); if (ret != 0) return ret; kp.arg += elemsize; val += len+1; (*num)++; } while (save == ','); if (*num < min) { printk(KERN_ERR "%s: needs at least %i arguments ", name, min); return -EINVAL; } return 0; } int param_array_set(const char *val, struct kernel_param *kp) { |
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const struct kparam_array *arr = kp->arr; |
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unsigned int temp_num; |
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return param_array(kp->name, val, 1, arr->max, arr->elem, |
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arr->elemsize, arr->set, kp->flags, arr->num ?: &temp_num); |
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} int param_array_get(char *buffer, struct kernel_param *kp) { int i, off, ret; |
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const struct kparam_array *arr = kp->arr; |
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struct kernel_param p; p = *kp; for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { if (i) buffer[off++] = ','; p.arg = arr->elem + arr->elemsize * i; ret = arr->get(buffer + off, &p); if (ret < 0) return ret; off += ret; } buffer[off] = '\0'; return off; } int param_set_copystring(const char *val, struct kernel_param *kp) { |
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const struct kparam_string *kps = kp->str; |
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if (!val) { printk(KERN_ERR "%s: missing param set value ", kp->name); return -EINVAL; } |
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if (strlen(val)+1 > kps->maxlen) { printk(KERN_ERR "%s: string doesn't fit in %u chars. ", kp->name, kps->maxlen-1); return -ENOSPC; } strcpy(kps->string, val); return 0; } int param_get_string(char *buffer, struct kernel_param *kp) { |
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const struct kparam_string *kps = kp->str; |
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return strlcpy(buffer, kps->string, kps->maxlen); } /* sysfs output in /sys/modules/XYZ/parameters/ */ |
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#define to_module_attr(n) container_of(n, struct module_attribute, attr); #define to_module_kobject(n) container_of(n, struct module_kobject, kobj); |
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extern struct kernel_param __start___param[], __stop___param[]; |
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struct param_attribute { struct module_attribute mattr; struct kernel_param *param; }; struct module_param_attrs { |
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unsigned int num; |
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struct attribute_group grp; struct param_attribute attrs[0]; }; |
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#ifdef CONFIG_SYSFS |
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#define to_param_attr(n) container_of(n, struct param_attribute, mattr); static ssize_t param_attr_show(struct module_attribute *mattr, struct module *mod, char *buf) { int count; struct param_attribute *attribute = to_param_attr(mattr); if (!attribute->param->get) return -EPERM; count = attribute->param->get(buf, attribute->param); if (count > 0) { strcat(buf, " "); ++count; } return count; } /* sysfs always hands a nul-terminated string in buf. We rely on that. */ static ssize_t param_attr_store(struct module_attribute *mattr, struct module *owner, const char *buf, size_t len) { int err; struct param_attribute *attribute = to_param_attr(mattr); if (!attribute->param->set) return -EPERM; err = attribute->param->set(buf, attribute->param); if (!err) return len; return err; } |
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#endif |
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#ifdef CONFIG_MODULES #define __modinit #else #define __modinit __init #endif |
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#ifdef CONFIG_SYSFS |
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/* |
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* add_sysfs_param - add a parameter to sysfs * @mk: struct module_kobject * @kparam: the actual parameter definition to add to sysfs * @name: name of parameter |
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* |
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* Create a kobject if for a (per-module) parameter if mp NULL, and * create file in sysfs. Returns an error on out of memory. Always cleans up * if there's an error. |
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*/ |
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static __modinit int add_sysfs_param(struct module_kobject *mk, struct kernel_param *kp, const char *name) |
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{ |
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struct module_param_attrs *new; struct attribute **attrs; int err, num; /* We don't bother calling this with invisible parameters. */ BUG_ON(!kp->perm); if (!mk->mp) { num = 0; attrs = NULL; } else { num = mk->mp->num; attrs = mk->mp->grp.attrs; |
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} |
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/* Enlarge. */ new = krealloc(mk->mp, sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1), GFP_KERNEL); if (!new) { kfree(mk->mp); err = -ENOMEM; goto fail; } attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL); if (!attrs) { err = -ENOMEM; goto fail_free_new; } |
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/* Sysfs wants everything zeroed. */ memset(new, 0, sizeof(*new)); memset(&new->attrs[num], 0, sizeof(new->attrs[num])); memset(&attrs[num], 0, sizeof(attrs[num])); new->grp.name = "parameters"; new->grp.attrs = attrs; /* Tack new one on the end. */ new->attrs[num].param = kp; new->attrs[num].mattr.show = param_attr_show; new->attrs[num].mattr.store = param_attr_store; new->attrs[num].mattr.attr.name = (char *)name; new->attrs[num].mattr.attr.mode = kp->perm; new->num = num+1; /* Fix up all the pointers, since krealloc can move us */ for (num = 0; num < new->num; num++) new->grp.attrs[num] = &new->attrs[num].mattr.attr; new->grp.attrs[num] = NULL; mk->mp = new; return 0; |
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fail_free_new: kfree(new); fail: mk->mp = NULL; return err; } |
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#ifdef CONFIG_MODULES |
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static void free_module_param_attrs(struct module_kobject *mk) { kfree(mk->mp->grp.attrs); kfree(mk->mp); mk->mp = NULL; |
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} |
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/* * module_param_sysfs_setup - setup sysfs support for one module * @mod: module * @kparam: module parameters (array) * @num_params: number of module parameters * |
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* Adds sysfs entries for module parameters under * /sys/module/[mod->name]/parameters/ |
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*/ int module_param_sysfs_setup(struct module *mod, struct kernel_param *kparam, unsigned int num_params) { |
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int i, err; bool params = false; for (i = 0; i < num_params; i++) { if (kparam[i].perm == 0) continue; err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); if (err) return err; params = true; } |
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if (!params) return 0; |
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/* Create the param group. */ err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); if (err) free_module_param_attrs(&mod->mkobj); return err; |
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} /* * module_param_sysfs_remove - remove sysfs support for one module * @mod: module * * Remove sysfs entries for module parameters and the corresponding * kobject. */ void module_param_sysfs_remove(struct module *mod) { |
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if (mod->mkobj.mp) { sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
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/* We are positive that no one is using any param * attrs at this point. Deallocate immediately. */ |
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free_module_param_attrs(&mod->mkobj); |
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} } #endif |
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void destroy_params(const struct kernel_param *params, unsigned num) { |
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/* FIXME: This should free kmalloced charp parameters. It doesn't. */ |
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} |
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static void __init kernel_add_sysfs_param(const char *name, struct kernel_param *kparam, unsigned int name_skip) |
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{ struct module_kobject *mk; |
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struct kobject *kobj; int err; |
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kobj = kset_find_obj(module_kset, name); if (kobj) { /* We already have one. Remove params so we can add more. */ mk = to_module_kobject(kobj); /* We need to remove it before adding parameters. */ sysfs_remove_group(&mk->kobj, &mk->mp->grp); } else { mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); BUG_ON(!mk); mk->mod = THIS_MODULE; mk->kobj.kset = module_kset; err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, "%s", name); if (err) { kobject_put(&mk->kobj); printk(KERN_ERR "Module '%s' failed add to sysfs, " "error number %d ", name, err); printk(KERN_ERR "The system will be unstable now. "); return; } /* So that exit path is even. */ kobject_get(&mk->kobj); |
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} |
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/* These should not fail at boot. */ err = add_sysfs_param(mk, kparam, kparam->name + name_skip); BUG_ON(err); err = sysfs_create_group(&mk->kobj, &mk->mp->grp); BUG_ON(err); |
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kobject_uevent(&mk->kobj, KOBJ_ADD); |
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kobject_put(&mk->kobj); |
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} /* * param_sysfs_builtin - add contents in /sys/parameters for built-in modules * * Add module_parameters to sysfs for "modules" built into the kernel. * * The "module" name (KBUILD_MODNAME) is stored before a dot, the * "parameter" name is stored behind a dot in kernel_param->name. So, * extract the "module" name for all built-in kernel_param-eters, |
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* and for all who have the same, call kernel_add_sysfs_param. |
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*/ static void __init param_sysfs_builtin(void) { |
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struct kernel_param *kp; unsigned int name_len; char modname[MODULE_NAME_LEN]; |
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for (kp = __start___param; kp < __stop___param; kp++) { |
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char *dot; |
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if (kp->perm == 0) continue; |
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dot = strchr(kp->name, '.'); |
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if (!dot) { |
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/* This happens for core_param() */ strcpy(modname, "kernel"); name_len = 0; } else { name_len = dot - kp->name + 1; strlcpy(modname, kp->name, name_len); |
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} |
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kernel_add_sysfs_param(modname, kp, name_len); |
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} |
1da177e4c
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682 683 684 685 |
} /* module-related sysfs stuff */ |
1da177e4c
|
686 |
|
1da177e4c
|
687 688 689 690 691 692 693 694 695 696 697 698 |
static ssize_t module_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { struct module_attribute *attribute; struct module_kobject *mk; int ret; attribute = to_module_attr(attr); mk = to_module_kobject(kobj); if (!attribute->show) |
70f2817a4
|
699 |
return -EIO; |
1da177e4c
|
700 |
|
1da177e4c
|
701 |
ret = attribute->show(attribute, mk->mod, buf); |
1da177e4c
|
702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 |
return ret; } static ssize_t module_attr_store(struct kobject *kobj, struct attribute *attr, const char *buf, size_t len) { struct module_attribute *attribute; struct module_kobject *mk; int ret; attribute = to_module_attr(attr); mk = to_module_kobject(kobj); if (!attribute->store) |
70f2817a4
|
717 |
return -EIO; |
1da177e4c
|
718 |
|
1da177e4c
|
719 |
ret = attribute->store(attribute, mk->mod, buf, len); |
1da177e4c
|
720 721 722 723 724 725 726 |
return ret; } static struct sysfs_ops module_sysfs_ops = { .show = module_attr_show, .store = module_attr_store, }; |
270a6c4ca
|
727 728 729 730 731 732 733 734 735 736 737 738 |
static int uevent_filter(struct kset *kset, struct kobject *kobj) { struct kobj_type *ktype = get_ktype(kobj); if (ktype == &module_ktype) return 1; return 0; } static struct kset_uevent_ops module_uevent_ops = { .filter = uevent_filter, }; |
7405c1e15
|
739 |
struct kset *module_kset; |
823bccfc4
|
740 |
int module_sysfs_initialized; |
1da177e4c
|
741 |
|
7405c1e15
|
742 |
struct kobj_type module_ktype = { |
1da177e4c
|
743 744 |
.sysfs_ops = &module_sysfs_ops, }; |
1da177e4c
|
745 746 747 748 749 |
/* * param_sysfs_init - wrapper for built-in params support */ static int __init param_sysfs_init(void) { |
7405c1e15
|
750 751 752 753 754 755 |
module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); if (!module_kset) { printk(KERN_WARNING "%s (%d): error creating kset ", __FILE__, __LINE__); return -ENOMEM; |
d8c7649e9
|
756 |
} |
823bccfc4
|
757 |
module_sysfs_initialized = 1; |
1da177e4c
|
758 759 760 761 762 |
param_sysfs_builtin(); return 0; } |
d10be6d1b
|
763 |
subsys_initcall(param_sysfs_init); |
1da177e4c
|
764 |
|
7405c1e15
|
765 |
#endif /* CONFIG_SYSFS */ |
ef665c1a0
|
766 |
|
1da177e4c
|
767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 |
EXPORT_SYMBOL(param_set_byte); EXPORT_SYMBOL(param_get_byte); EXPORT_SYMBOL(param_set_short); EXPORT_SYMBOL(param_get_short); EXPORT_SYMBOL(param_set_ushort); EXPORT_SYMBOL(param_get_ushort); EXPORT_SYMBOL(param_set_int); EXPORT_SYMBOL(param_get_int); EXPORT_SYMBOL(param_set_uint); EXPORT_SYMBOL(param_get_uint); EXPORT_SYMBOL(param_set_long); EXPORT_SYMBOL(param_get_long); EXPORT_SYMBOL(param_set_ulong); EXPORT_SYMBOL(param_get_ulong); EXPORT_SYMBOL(param_set_charp); EXPORT_SYMBOL(param_get_charp); EXPORT_SYMBOL(param_set_bool); EXPORT_SYMBOL(param_get_bool); EXPORT_SYMBOL(param_set_invbool); EXPORT_SYMBOL(param_get_invbool); EXPORT_SYMBOL(param_array_set); EXPORT_SYMBOL(param_array_get); EXPORT_SYMBOL(param_set_copystring); EXPORT_SYMBOL(param_get_string); |